WO2013084460A1 - Refrigerator - Google Patents

Abstract

A refrigerator is provided with: a cooler (107) provided on the rear surface side of the refrigerator and generating cool air; and a cooler cover (120) having a defrosting heater (132) which is provided below the cooler (107) and also having a cool air return opening (135). The center of the defrosting heater (132) is located above the lower surface of a freezing compartment. A protrusion member (136) protruding toward the inside of the refrigerator is disposed on the lower surface of the freezing compartment. The lower end of the cool air return opening (135) and the upper end of the protrusion member (136) are overlapped in the height direction.

Description

refrigerator

The present invention relates to a refrigerator provided with a defrosting heater.

In recent years, energy conservation in refrigerators has progressed, and in order to reduce the power consumption of refrigerators, the efficiency of compressors with large inputs has been increased to increase the cooling efficiency, and the defrosting efficiency when melting frost on the cooler has been improved. There is a way to make it.

Among them, as a conventional refrigerator for reducing the power consumption of the refrigerator, a refrigerator in which the ventilation resistance of the cooling air passage is reduced and the cooling air volume is increased to improve the cooling efficiency is disclosed (for example, see Patent Document 1). ). Moreover, what accelerated | stimulated the heat convection at the time of a defrost is disclosed (for example, refer patent document 2).

Hereinafter, the conventional refrigerator will be described with reference to the drawings.

FIG. 25 is a detailed side sectional view around the cooler of a conventional refrigerator. As shown in the figure, the cooler 1 is installed between a cooler cover 4 that partitions the freezer compartment 2 and the cooler compartment 3 and an inner box 5 of the refrigerator body. On the lower side of the front surface of the cooler 1, a cold air return port 6 constituted by the cooler cover 4 is opened. The upper end of the opening of the cool air return port 6 is located above the lower surface of the cooler 1, and the lower end of the opening of the cool air return port 6 is located below the lower surface of the cooler 1. Thus, by increasing the opening of the cool air return port 6, the circulation efficiency of the cool air is improved and the cooling performance is improved.

Also, below the cooler 1, a defrost heater 7 for melting frost attached to the cooler 1 is disposed. In order to arrange the defrost heater 7, the back side of the partition portion 9 that partitions the freezer compartment 2 and the vegetable compartment 8 is formed into a concave shape, and the defrost heater 7 is arranged inside the concave shape, thereby returning from the freezer compartment 2. The heat exchange efficiency is improved by guiding the cool air flow to the cooler 1 without obstructing it.

Moreover, the guide part 10 is provided in the opening inside the cool air return port 6 of the cooler cover 4 so as to suppress the heat from the defrost heater 7 heated during the defrosting from flowing into the freezer compartment 2. is doing. Since the angle of the guide portion 10 is a constant angle θ with respect to the horizontal direction on the cooler 1 side, the return cold air from the freezer compartment 2 flows smoothly into the cooler 1 and the heat exchange efficiency is improved.

With this configuration, it is possible to improve the heat exchange efficiency by improving the convection of the cold air flowing into the cooler 1, and to reduce the power consumption of the refrigerator.

FIG. 26A and FIG. 26B are detailed side sectional views around the cooler of another conventional refrigerator.

As shown in the figure, on the back side of the freezer compartment of the refrigerator, a cooler 11 and a cooler cover 12 that covers the cooler 11 and forms an air passage are disposed, and the cooler 11 is disposed below the cooler 11. A defrost heater 13 for melting the attached frost is disposed. A cover heater 14 that covers the defrost heater 13 is disposed above the defrost heater 13.

The cover heater 14 is inclined in the front-rear direction, and the back end surface is raised so that the distance between the end surface of the cover heater 14 on the back side and the back wall is larger than the interior side. Thereby, since the heat which generate | occur | produced from the defrost heater 13 at the time of defrost can be raised by the back heat insulation wall side, the temperature rise of the freezer compartment 15 can be suppressed. Furthermore, the heat generated by the defrost heater 13 can be efficiently applied to the frost adhering around the pipe of the cooler 11. Furthermore, as shown in FIG. 26B, since the cold air on the freezer compartment 15 side in the cooler cover 12 is cooled in the freezer compartment 15 and falls to the vicinity of the defrost heater, convection occurs in the cooler cover 12 to remove the defrost. Has the effect of stabilizing. Moreover, with respect to the freezer compartment 15, the defrost heater 13 itself is hidden by the cover heater 14, and the heater red heat at the time of defrost is not seen.

In the conventional refrigerator shown in FIG. 25, there is an effect of saving energy by enlarging the opening of the cool air return port 6 and increasing the amount of air passing through the cooler 1 to improve the cooling efficiency. However, since the angle of the guide portion 10 is fixed at a constant angle θ, a problem arises in that the defrost heater having a diameter of approximately 10 to 20 mm can see the heater red heat from the gap between the guide portions depending on the viewing angle.

In recent years, the refrigerator industry has been trending toward smaller spaces and larger capacities, with the same external dimensions compared to about 10 years ago, and the internal capacity has increased by about 100L. This is because efforts are made to eliminate the ineffective space in the refrigerator and the wall thickness is reduced while improving the heat insulation performance of the main body. As in the above-described conventional example, if the rear surface of the partition portion is concave and the defrost heater 7 is disposed in the concave portion so as to be accommodated in the partition portion, the invalid space increases and the internal volume decreases. In addition, in the process of manufacturing the refrigerator, there is a problem that when the rigid urethane foam formed in close contact with the inside of the outer box and the inner box is foamed, it is easily deformed and the moldability is poor. Further, when the cooler cover 4 having an enlarged opening of the cold air return port 6 is installed with the deformation of the rigid urethane foam, the size of the cold air return port 6 is not regulated. As a result, the workability at the time of attachment becomes difficult, the yield is reduced and the opening area is reduced, and a sufficient cooling effect cannot be exhibited.

In the refrigerator of the conventional example shown in FIGS. 26A and 26B, although there is an effect of improving the defrosting efficiency by promoting the convection of heat at the time of defrosting, the inclination of the cover heater 14 causes the front side of the cooler 11 to be moved. Increases the amount of frost formation. At the time of defrosting, since the defrosting is performed mainly on the back side of the cooler 11, defrosting on the front side of the cooler 11 having a large amount of frost formation is delayed, and the entire defrosting time is extended. As a result, not only does the heat of the defrost heater 13 affect the interior of the refrigerator, but the interior temperature rises, and during the defrosting time, it does not cool, so the increase in the interior temperature due to heat penetration from the outside of the refrigerator increases. In particular, there is a problem of causing adverse effects on frozen foods.

Also, the contribution of the cooler 11 to energy saving is high, and in recent years, there have been examples of efforts to realize energy saving at low cost by increasing the surface area on the air side, such as an increase in size, the number of pipes, and an increase in cooling fins. At this time, the heat at the time of defrosting convects the outer periphery of the cooler 11 due to the inclination of the cover heater 14, but the central portion of the cooler 11 is less susceptible to the convection effect. Therefore, although the cooler 11 having two rows of pipes is effective, when the number of pipes is increased to three rows for energy saving, there is a problem that the refrigerant stays in the central pipe and is difficult to defrost. .

The present invention provides a large-capacity refrigerator that suppresses ineffective space and a high energy-saving performance because it has a high cooling capacity.

In addition, as a conventional refrigerator for reducing the power consumption of the refrigerator, one that obtains an energy saving effect by suppressing the inflow of the air heated by the defrost heater and suppressing the temperature rise in the refrigerator is disclosed ( For example, refer to Patent Document 3), and further, the cooling efficiency is improved by improving the cooling efficiency by allowing the return cold air from the inside to pass through the lower side of the cooler as much as possible (for example, Patent Document 4). reference).

Hereinafter, the conventional refrigerator will be described with reference to the drawings.

FIG. 27 is a detailed side sectional view around the cooler of a conventional refrigerator. As shown in the figure, the cooler 21 is installed between a cooler cover 24 that partitions the freezer compartment 22 and the cooler compartment 23, and an inner box 25 of the refrigerator body. On the lower side of the front surface of the cooler 21, a cool air return port 26 configured by a cooler cover 24 is opened. The upper end of the opening of the cool air return port 26 is located above the lower surface of the cooler 21, and the lower end of the opening of the cool air return port 26 is located below the lower surface of the cooler 21. Thus, by increasing the opening of the cold air return port 26, the circulation efficiency of the cold air is improved and the cooling performance is improved. A warm air inflow space 28 into which air opened and heated by the defrost heater 27 flows is provided below the cooler cover 24 between the inner side of the cooler cover 24 and the cooler 21 side.

At the time of defrosting, the air heated by the defrost heater 27 flows more into the warm air inflow space 28 than inside the warehouse, so that the temperature rise in the warehouse can be suppressed and the amount of heat energy that warmed the interior at the time of defrosting. Can reduce energy consumption.

FIG. 28 is a detailed side sectional view around the cooler of another conventional refrigerator.

As shown in the figure, the refrigerator is provided with a cooler chamber 33 which is defined by a cooler cover 31 and forms an air circulation path with the freezer chamber 32 on the rear surface of the freezer chamber. In the cooler chamber 33, a fan 34, a cooler 35, a cover heater 36, and a defrost heater 37 are arranged from above. The bottom surface portion is a water receiving portion 38 that receives defrost water melted by the heat of the defrost heater 37 during defrosting. Further, a cooler chamber inlet 39 in the circulation path is formed on the lower front side of the cooler chamber 33, and the return cool air is supplied to the bottom surface portion of the cooler chamber 33, that is, the water receiving portion 38. A toy 40 is provided to be turned and directed toward the back side. The inner box 41 on the back side is provided with a separate guide 42 for guiding the return cold air that has entered through the water receiving portion 38 to the front side of the cooler.

With this configuration, the airflow that has turned to the inner box 41 side, which is the back surface of the cooler chamber 33, is directed to the front surface portion of the cooler 35, and most of the cool air is allowed to pass through the interior from the upstream side of the cooler 35. it can. For this reason, it becomes possible to improve the distribution of the airflow flowing inside the cooler 35, the cooler 35 can be used effectively, and the cooling efficiency is improved.

In the conventional refrigerator shown in FIG. 27, there is an effect of saving energy by reducing heat energy by suppressing the inflow of air heated by the defrost heater 27 during defrosting. However, since the temperature rise of the warm air inflow space 28 itself is inevitable, the temperature on the back side of the interior is particularly affected by the heat conduction from the warm air inflow space 28 to the interior of the interior. Since the food stored on the back side of the chamber is subject to temperature fluctuations, there is a problem that the inside of the food is repeatedly frozen and thawed every time it is defrosted, resulting in deterioration of freshness.

Further, in the conventional refrigerator shown in FIG. 28, the efficiency of the cooler 35 is improved by changing the flow direction of the return cold air flowing in the cooler chamber 33, and there is an effect of saving energy. However, the toy 40 provided in order to change the wind direction of the return cold air increases the ventilation resistance of the suction portion and decreases the total air volume. As a result, the circulating air volume passing through the cooler 35 is also reduced, resulting in a problem that a sufficient cooling effect cannot be exhibited.

Further, since the toy 40 is disposed in the vicinity of the front surface of the defrosting heater 37, it is affected by temperature due to heat generated by the defrosting heater 37 during defrosting. Due to the heat generated by the defrost heater 37 during defrosting, the surface of the defrost heater 37 generally rises to about 300 degrees Celsius. As a result, the surface of the toy 40 provided in the vicinity of the defrosting heater 37 also rises to approximately 100 ° C. or higher, and therefore, a member such as a surface covering with a metal such as aluminum foil is necessary to prevent deformation due to heat. Thus, there has been a problem that material costs and man-hours are increased.

The present invention provides a large-capacity refrigerator that has high cooling efficiency and efficiency during defrosting, high energy-saving performance, and reduced ineffective space.

JP 2007-71487 A JP 2011-127850 A JP 2010-60188 A JP 2011-89718 A

The refrigerator of the present invention has a refrigerator body and a freezing room in a freezing temperature zone in the refrigerator. In addition, a cooler for generating cool air provided on the back side of the freezer compartment, a defrost heater provided below the cooler, and a defrost water that falls below the defrost heater and melts and falls off the frost attached to the cooler. A cooler chamber with a drain pan for receiving; Furthermore, the cooler cover which covers the cooler with the cool air return port for the cool air that has cooled the freezer compartment to return to the cooler is provided. The center of the defrosting heater is above the lower surface of the freezer compartment in the horizontal direction, and a protrusion member protruding inward of the refrigerator is disposed on the lower surface of the freezer compartment, and the lower end of the cold air return port and the upper end of the protrusion member overlap in the height direction. It was.

Thus, according to the present invention, it is possible to prevent the red heat from the defrost heater from leaking to the outside during the defrosting by providing an overlap margin between the lower end of the cold air return port and the protruding member. In addition, the space between the lower end of the cool air return port and the protruding member allows the cool air returning from the interior to the cooler to ensure not only the front surface of the return port but also the convection from the lower side of the cooler. For this reason, the heat exchange area in the cooler can be increased, and the circulation air volume can be increased by lowering the return resistance of the return cold air, the heat exchange amount in the cooler is increased, the evaporation temperature is increased, and the refrigeration is increased. Energy saving can be achieved by improving cycle efficiency.

Also, since the time for cooling the inside of the warehouse can be reduced by improving the heat exchange amount of the cooler and increasing the circulating air volume, the amount of frost formation on the cooler due to the shortening of the cooling operation time can also be reduced. This makes it possible to extend the periodic defrost cycle for melting the frost in the cooler, reducing the number of inputs of the defrost heater and reducing the power input required for cooling the chamber after the chamber temperature rises due to defrosting. This can save energy.

Also, to increase the heat exchange area of the cooler by improving the air path is to increase the area where the cooler can be frosted. At this time, the flow from the inside to the cooler can be improved, and the frosting of the cooler can be uniformly frosted on the cooler, so that deterioration of the cooling capacity at the time of frosting can also be suppressed. . This makes it possible to extend the defrost cycle, which is the time required to operate the refrigerator and require defrosting, and to reduce the number of inputs of the defrost heater and to cool the chamber after the chamber temperature rises due to defrosting Input can be reduced and further energy saving can be achieved.

The refrigerator of the present invention includes a cooler that is provided on the back side of the refrigerator and generates cold air, a defrost heater that is provided below the cooler, and the cool air that covers the cooler and cools the freezer compartment to the cooler. A cooler cover having a cold return port for return is provided. The cooler cover is composed of a cooler front cover inside the refrigerator and a cooler rear cover, and a cooler return is provided in front of the cooler with a heat transfer suppression space by the cooler front cover and cooler rear cover. A defrosting warm air guide member is provided at the mouth.

This allows the defrosting warm air guide member to effect the convection due to the heat of the defrosting heater easily to the cooler, increasing the defrosting efficiency and saving energy by shortening the defrosting time. Furthermore, by suppressing the temperature rise by shortening the non-cooling operation time at the time of defrosting and preventing the warm air from flowing into the warehouse, not only can the energy consumption be reduced in the cooling load, but also the temperature fluctuations in the food can be reduced, so the deterioration of freshness is suppressed and long-term Allows saving.

In addition, even if the temperature around the cooler rises during defrosting due to the heat transfer suppression space, heat transfer to the inside of the cabinet can be suppressed, thus reducing the temperature effect on food stored in the back of the cabinet. As a result, the deterioration of freshness is suppressed and long-term storage becomes possible.

FIG. 1 is a perspective view of a refrigerator in the first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the refrigerator in the first embodiment of the present invention. FIG. 3 is a longitudinal sectional view around the refrigerator cooler of the first embodiment of the present invention. FIG. 4 is a detailed longitudinal sectional view around the refrigerator cooler of the refrigerator in the first embodiment of the present invention. FIG. 5 is a resistance curve image diagram of the cold air blowing fan of the refrigerator in the first embodiment of the present invention. FIG. 6 is a detailed longitudinal sectional view around the cooler of the refrigerator in the second embodiment of the present invention. FIG. 7 is a detailed longitudinal sectional view around the cooler of the refrigerator according to the third embodiment of the present invention. FIG. 8 is a detailed longitudinal sectional view around the refrigerator cooler in the fourth embodiment of the present invention. FIG. 9 is a perspective view of a refrigerator in the fifth embodiment of the present invention. FIG. 10 is a longitudinal sectional view of a refrigerator in the fifth embodiment of the present invention. FIG. 11 is a longitudinal sectional view of the periphery of the refrigerator cooler according to the fifth embodiment of the present invention. FIG. 12 is a detailed longitudinal sectional view of the periphery of the refrigerator cooler in the fifth embodiment of the present invention. FIG. 13 is an image of a resistance curve of the cold air blowing fan of the refrigerator in the fifth embodiment of the present invention. FIG. 14 is a detailed longitudinal sectional view around the refrigerator cooler of the sixth embodiment of the present invention. FIG. 15 is a detailed longitudinal sectional view around the cooler of the refrigerator in the seventh embodiment of the present invention. FIG. 16 is a detailed longitudinal sectional view around the cooler of the refrigerator in the eighth embodiment of the present invention. FIG. 17 is a perspective view of the refrigerator according to the ninth embodiment of the present invention. FIG. 18 is a longitudinal sectional view of a refrigerator in the ninth embodiment of the present invention. FIG. 19 is a longitudinal sectional view of the vicinity of the refrigerator cooler in the ninth embodiment of the present invention. FIG. 20 is a detailed longitudinal sectional view around the cooler of the refrigerator in the ninth embodiment of the present invention. FIG. 21 is a resistance curve image diagram of the cold air blower fan of the refrigerator in the ninth embodiment of the present invention. FIG. 22 is a detailed longitudinal sectional view around the cooler of the refrigerator in the tenth embodiment of the present invention. FIG. 23 is a rear view of the refrigerator cover of the refrigerator in the tenth embodiment of the present invention. FIG. 24 is an explanatory diagram of a basic heat exchange unit of the refrigerator cooler according to the tenth embodiment of the present invention. FIG. 25 is a detailed side cross-sectional view of the refrigerator periphery of the refrigerator for explaining the refrigerator according to the prior art. FIG. 26A is a side cross-sectional detail view around the refrigerator cooler illustrating a refrigerator according to the prior art. FIG. 26B is a detailed side sectional view of the periphery of the refrigerator cooler illustrating the refrigerator according to the prior art. FIG. 27 is a detailed side cross-sectional view around the refrigerator cooler for explaining the refrigerator according to the prior art. FIG. 28 is a detailed side sectional view of the periphery of the refrigerator cooler for explaining the refrigerator according to the prior art.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(First embodiment)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of the refrigerator according to the first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the refrigerator in the first embodiment of the present invention. FIG. 3 is a vertical cross-sectional view around the cooler of the refrigerator in the first embodiment of the present invention. FIG. 4 is a detailed longitudinal sectional view around the cooler of the refrigerator in the first embodiment of the present invention.

As shown in FIGS. 1 to 4, the refrigerator main body 101 includes a metal (for example, iron plate) outer box 124, a hard resin (for example, ABS) inner box 125, and an outer box 124 and an inner box 125. Insulating body 126 made of rigid urethane foam filled with foam. The refrigerator main body 101 includes a refrigerating chamber 102 provided in an upper portion, an upper freezing chamber 103 provided under the refrigerating chamber 102, and an ice making chamber 104 provided in parallel with the upper freezing chamber 103 under the refrigerating chamber 102. It has. Furthermore, the refrigerator main body 101 includes a vegetable compartment 106 provided at the lower part of the main body, an upper freezer compartment 103 installed in parallel, and a lower freezer compartment 105 provided between the ice making chamber 104 and the vegetable compartment 106. The front part of the upper freezer 103, ice making room 104, lower freezer room 105 and vegetable room 106 can be freely opened and closed by a drawer-type upper freezer room door 103a, ice making room door 104a, lower freezer room door 105a and vegetable room door 106a. Is done. The front surface of the refrigerator compartment 102 is closed freely by a double door type refrigerator compartment door 102a.

The temperature of the refrigerator compartment 102 is normally set at 1 to 5 ° C. with the lower limit of the temperature at which it does not freeze for refrigerated storage. The temperature of the vegetable compartment 106 is often set to 2 ° C. to 7 ° C., which is the same as or slightly higher than that of the refrigerator compartment 102. If the temperature is lowered, the freshness of leafy vegetables can be maintained for a long time.

The temperature of the upper freezer compartment 103 and the lower freezer compartment 105 is usually set at −22 to −18 ° C. for frozen storage. However, in order to improve the frozen storage state, for example, at a low temperature of −30 to −25 ° C. Sometimes set.

Since the refrigerator compartment 102 and the vegetable compartment 106 are set at a plus temperature in the cabinet, they are called refrigerated temperature zones. The upper freezer compartment 103, the lower freezer compartment 105, and the ice making room 104 are called freezing temperature zones because the interior is set at a minus temperature. Further, the upper freezer compartment 103 may be a room that can be selected from a refrigeration temperature zone to a freezing temperature zone by using a damper mechanism or the like as a switching chamber.

The top surface portion of the refrigerator main body 101 is formed of a first top surface portion 108 and a second top surface portion 109 by providing a dent in a staircase shape toward the back surface of the refrigerator. A machine room 119 is provided in the second top surface 109 provided with a stepped recess. A compressor 117 disposed in the machine chamber 119 of the stepped recess, a dryer (not shown) for removing moisture, a capacitor (not shown), a heat radiating pipe (not shown), A refrigerant is sealed in a refrigeration cycle in which the capillary tube 118 and the cooler 107 are sequentially connected in an annular shape, and a cooling operation is performed. In recent years, a flammable refrigerant is often used as a refrigerant for environmental protection. In the case of a refrigeration cycle using a three-way valve or a switching valve, these functional components can be disposed in the machine room 119.

Further, the refrigerator compartment 102, the ice making compartment 104, and the upper freezer compartment 103 are partitioned by a first heat insulating partition 110. Further, the ice making chamber 104 and the upper freezing chamber 103 are partitioned by a second heat insulating partition 111. In addition, the ice making chamber 104, the upper freezing chamber 103, and the lower freezing chamber 105 are partitioned by a third heat insulating partition 112.

Since the second heat insulating partition part 111 and the third heat insulating partition part 112 are parts assembled after foaming of the refrigerator main body 101, expanded polystyrene is usually used as a heat insulating material, but in order to improve heat insulating performance and rigidity. Rigid urethane foam may be used. Furthermore, a highly heat-insulating vacuum heat insulating material may be inserted as the second heat insulating partition portion 111 and the third heat insulating partition portion 112 to further reduce the thickness of the partition structure.

In addition, by securing the operating part of the door frame and thinning or eliminating the shapes of the second heat insulating partition part 111 and the third heat insulating partition part 112, a cooling air passage can be secured and the cooling capacity can be improved. You can also Further, by hollowing out the inside of the second heat insulating partition part 111 and the third heat insulating partition part 112 to form an air passage, the material can be reduced and the cost can be reduced.

Further, the lower freezer compartment 105 and the vegetable compartment 106 are partitioned by a fourth heat insulating partition 113.

Next, the configuration around the cooler in the present embodiment will be described.

A cooler chamber 123 is provided on the back surface of the refrigerator main body 101. In the cooler chamber 123, a fin-and-tube type cooler 107 that generates cool air is a heat insulation partition wall. Including the rear region of the heat insulating partition part 111 and the third heat insulating partition part 112, it is vertically arranged in the vertical direction on the back surface of the lower freezer compartment 105.

A cooler cover 120 made of aluminum or copper covering the cooler 107 is disposed on the front surface of the cooler chamber 123, and the cooler air that has cooled the lower freezing chamber 105 is returned to the cooler cover 120. A cold air return port 135 is provided.

The wind direction guide part 122 is provided in the cool air return port 135 provided in the lower part of the cooler cover 120. The interval between the wind direction guide portions 122 is 5 mm or more, and consideration is given to preventing the intrusion of fingers and ensuring the strength of the mold and the cooler cover 120.

In the vicinity of the cooler 107 (for example, the upper space), the cold air generated by the cooler 107 is stored in each storage room of the refrigerator compartment 102, the ice making room 104, the upper freezer room 103, the lower freezer room 105, and the vegetable room 106 by a forced convection method. A cold air blowing fan 116 for blowing air is disposed. Below the cooler 107, there is provided a defrost heater 132 composed of a glass tube heater that defrosts frost adhering to the cooler 107 and the cool air blowing fan 116 during cooling. A cover heater 133 that covers the defrost heater 132 is disposed above the defrost heater 132 made of a glass tube heater. The cover heater 133 has a glass tube diameter and a width of the defrost heater 132 so that a sound such as a juicy sound is not generated by a water drop dripped from the cooler 107 at the time of defrosting directly falling on the surface of the glass tube heated by defrosting. The dimensions are equivalent or better.

Below the defrosting heater 132, a drain pan 134 that is integrated with the upper surface of the fourth heat insulating partition 113, which is the lower surface of the freezing chamber that receives the defrosting water that has defrosted and dropped from the chiller 107, is disposed. ing.

Here, the drain pan 134 integrated with the upper surface of the fourth heat insulating partition 113 is provided with a protruding member 136 that protrudes toward the inside of the refrigerator on the lower surface of the freezer compartment. Further, the protruding member 136 is disposed between the lower end of the cold air return port 135 and the defrost heater 132. As a result, the red heat inside the chamber is also invisible, and the projection member 136 is hidden at the lower end of the cool air return port of the cooler cover 120 when viewed from the inside of the chamber, so that the appearance is good and the appearance quality is improved.

The center of the defrost heater 132 is disposed at a position above the upper surface of the fourth heat insulating partition 113. Thereby, the shape of the drain pan 134 integrated with the lower surface of the freezer compartment can be made substantially horizontal, the ineffective space for installing the defrost heater 132 can be reduced, and the internal volume can be increased. I can do it. In addition, the fact that the depth of the drain pan 134 can be reduced can reduce the cost of the mold when molding the component parts, which leads to cost reduction. In addition, it is possible to suppress deformation when foaming the heat insulating main body 126 made of rigid urethane foam that is in close contact with the outer box 124 and the inner box 125 of the refrigerator main body 101, thereby improving product yield and reducing disposal costs. In addition, since the workability at the time of installation is improved, a refrigerator with good appearance quality can be provided.

Here, isobutane, which is a flammable refrigerant with a low global warming potential, is used as a refrigerant in the recent refrigeration cycle from the viewpoint of global environmental conservation. This hydrocarbon, isobutane, has a specific gravity of about twice that at normal temperature and atmospheric pressure (at 2.04 and 300K) compared to air. As a result, the refrigerant charging amount can be reduced as compared with the conventional case, and the cost is low. In addition, the amount of leakage when the flammable refrigerant leaks is reduced, and the safety can be further improved.

In the present embodiment, isobutane is used as the refrigerant, and the maximum temperature on the surface of the glass tube, which is the outline of the defrost heater 132 during defrosting, is regulated as an explosion-proof measure. In order to reduce the temperature on the surface of the glass tube, the defrost heater 132 employs a double glass tube heater in which glass tubes are formed in double. In addition, as a means for reducing the temperature on the surface of the glass tube, a member (for example, an aluminum fin) having high heat dissipation can be wound around the surface of the glass tube. At this time, the external dimensions of the defrost heater 132 can be reduced by using a single glass tube.

As a means for improving the efficiency at the time of defrosting, in addition to the defrosting heater 132 made of a glass tube heater, a pipe heater in close contact with the cooler 107 may be used in combination. In this case, the defrosting of the cooler 107 is efficiently performed by direct heat transfer from the pipe heater. At the same time, the frost adhering to the drain pan 134 and the cool air blower fan 116 around the cooler 107 can be melted by the defrost heater 132, so that the defrost time can be shortened, and the internal temperature during the energy saving and defrost time is increased. Can be suppressed.

In addition, when combining the defrost heater 132 which consists of a glass tube heater, and a pipe heater, it becomes possible to make the capacity | capacitance of the defrost heater 132 low by optimizing each heater capacity | capacitance. If the heater capacity is lowered, the temperature of the outline of the defrost heater 132 at the time of defrosting can also be lowered, so that red heat at the time of defrosting can also be suppressed.

Next, the cooling of the refrigerator will be described. For example, when the freezer compartment 105 rises in temperature due to intrusion heat from outside air and door opening / closing, etc. and the freezer compartment sensor (not shown) exceeds the starting temperature, the compressor 117 is started and cooling is performed. Be started. While the high-temperature and high-pressure refrigerant discharged from the compressor 117 finally reaches a dryer (not shown) disposed in the machine room 119, particularly in a heat radiating pipe (not shown) installed in the outer box 124. The liquid is cooled and liquefied by heat exchange with the heat insulation body 126 made of the air outside the outer box 124 and the hard urethane foam in the warehouse.

Next, the liquefied refrigerant is decompressed by the capillary tube 118, flows into the cooler 107, and exchanges heat with the cool air in the vicinity of the cooler 107. The cold air subjected to heat exchange is blown into the cabinet by a nearby cool air blower fan 116 to cool the inside of the cabinet. Thereafter, the refrigerant is heated, gasified, and returned to the compressor 117. When the inside of the refrigerator is cooled and the temperature of the freezer compartment sensor (not shown) becomes equal to or lower than the stop temperature, the operation of the compressor 117 is stopped.

Although the cool air blowing fan 116 may be directly disposed in the inner box 125, it is disposed in the second heat insulating partition 111 assembled after foaming, and the manufacturing cost is reduced by performing block processing of the parts. You can also

Next, a description will be given of when the refrigerator is defrosted.

When the refrigerator is cooled, over time, the moisture in the air that has entered when the door is opened and closed, the moisture adhering to the food put in the cabinet, the moisture from the vegetables stored in the vegetable compartment 106, etc. Frost adheres to the cooler 107. When the frost grows, the heat exchange efficiency is lowered between the cooler 107 and the circulating cold air, and the inside of the refrigerator cannot be sufficiently cooled, and finally becomes an uncooled state. Therefore, in a refrigerator, it is necessary to defrost frost adhering to a cooler regularly.

In the refrigerator according to the present embodiment, the refrigerator is operated, and defrosting is automatically performed after a certain period of time. At the time of defrosting, the operation of the compressor 117 and the cold air blowing fan 116 is stopped, and the defrosting heater 132 composed of a glass tube heater is energized. The cooler 107 generally has a sensible heat change from −30 ° C. to 0 ° C., a latent heat change at 0 ° C., 0 ° C. due to melting of the refrigerant staying in the cooler 107 and frost adhering to the cooler 107. The temperature rises through a sensible heat change from ℃. Here, a defrost sensor (not shown) is attached to the cooler 107, and the energization of the defrost heater 132 is stopped when a predetermined temperature is reached. In the present embodiment, energization of the defrost heater 132 is stopped when the defrost sensor detects 10 ° C.

At this time, by energizing the defrost heater 132, the surface of the glass tube becomes high temperature, and by melting frost attached to the drain pan 134 and the cool air blower fan 116 around the cooler 107 and the cooler 107 around the cooler by radiant heat, The cooler 107 is refreshed.

For example, in the case of low outside air of about 5 ° C., even if the frost in the cooler 107 is sufficiently defrosted, the temperature of the defrost sensor is not sufficiently raised during defrosting due to the outside air, and the defrosting time is It tends to be long. In this case, the state of sensible heat change of 0 ° C. or higher can be seen, and control for terminating the defrosting can be combined if a certain time or more has elapsed. As a result, although the defrosting is sufficiently performed, the defrosting time becomes longer due to insufficient temperature rise of the cooler 107 with low outside air, and the temperature rise due to unnecessary heater input or radiant heat into the chamber. Further, the temperature rise due to the cooling stop at the time of defrosting can be suppressed.

About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

As in this embodiment, a refrigerator layout configuration in which the vegetable compartment 106 is installed below, the lower freezer compartment 105 is installed in the middle, and the refrigerator compartment 102 is installed above is often used from the viewpoint of usability and energy saving. ing. In addition, from the viewpoint of ease of use, a refrigerator having a full-open mechanism that allows a large drawer allowance for the lower freezer compartment 105 and the vegetable compartment 106 is also provided.

At this time, when the drawer allowance of the lower freezer compartment 105 is fully opened, the cooler cover 120 and the cool air return port 135 at the lower part of the cooler cover 120 that are difficult to see by the back of the case inside the refrigerator are visible.

Among them, in the present embodiment, a protruding member 136 protruding toward the inside of the refrigerator is disposed on the lower surface of the freezer compartment. 3 and 4, the distance to the lower end of the cool air return port 135 is A, the height to the upper surface of the protruding member 136 is B, and the defrost heater is based on the upper surface of the fourth heat insulating partition 113. Let C be the distance to the center of 132. The overlap margin in the height direction between the lower end of the cool air return port 135 and the protruding member 136 is set to 0 mm or more. That is, the relation of A ≦ B is established. At this time, if A ≧ C and B ≧ A ≧ C, since red heat from the defrost heater 132 made of a glass tube heater at the time of defrosting can be made invisible, the freezer compartment door at the time of defrosting of the refrigerator Even when the door is opened, there is no concern for the user due to the red heat of the defrost heater 132.

Also, assuming that the spatial distance between the lower end of the cool air return port 135 and the protruding member 136 is D, in this embodiment, the relationship is B ≦ D. As a result, the return cold air from the interior to the cooler 107 can secure not only the airflow direction guide portion 122 on the front surface of the cool air return port 135 but also the convection from the lower side of the interior, so that the return cold air can pass. The area to be taken can be increased and the ventilation resistance can be further reduced. As a result, the amount of circulating air can be increased, the amount of heat exchange in the cooler 107 is increased, the evaporation temperature is increased, and energy can be saved by improving the efficiency of the refrigeration cycle.

Moreover, since the time for cooling the inside of the warehouse can be reduced by improving the heat exchange amount of the cooler 107 and increasing the circulating air volume, the amount of frost on the cooler 107 can also be reduced by shortening the cooling operation time. . As a result, the defrost cycle of the cooler 107 can be extended, the number of inputs of the defrost heater 132 can be reduced, and the input required for cooling the inside of the cabinet after the inside temperature has been increased due to defrosting can be further reduced, thereby further saving energy. be able to.

Moreover, since the heat exchange area of the cooler 107 can be increased by improving the air path is to increase the area to be frosted on the cooler 107, it is possible to suppress deterioration of the cooling capacity at the time of frost formation. . As a result, it is possible to extend the time required to operate the refrigerator and require defrosting, and to reduce the number of inputs of the defrosting heater 132 and to reduce the input required for cooling the interior after the internal temperature rise due to defrosting. Further energy saving can be performed.

When the ventilation resistance is reduced, the circulating air volume of the cold air fan 116 is increased when the fan voltage is the same. FIG. 5 shows a characteristic image of ventilation resistance and air volume. As shown in FIG. 5, in the cooling performance of the refrigerator, the circulation air volume increases from Q1 to Q2 when the ventilation resistance is reduced from point 1 to point 2 P1 to P2 due to the characteristics of the fan.

Furthermore, when the performance can be secured with the same air volume, the same air volume can be obtained by reducing the fan rotation speed of the cool air blowing fan 116. In this case, the characteristic moves from the point 2 to the point 3, and the input is reduced by a decrease in the fan rotation speed, and energy saving as an electric input can be achieved. Furthermore, since the wind noise of the cool air blower fan 116 can be reduced by lowering the fan rotation speed, the noise does not bother even in a quiet environment with low ambient noise such as at night.

Further, in the present embodiment, the shape of the cool air return port 135 is regulated, and the protrusion member 136 is brought into contact with the outer periphery of the cooler cover 120 constituting the lower end of the cool air return port 135 for the purpose of securing the opening area. Yes.

Thereby, since the outer periphery of the cool air return port 135 which is easily deformed when the cold air return port 135 is greatly opened can be fixed, the size of the cold air return port 135 is regulated, and the opening area is secured and sufficient cooling effect is obtained. Can be demonstrated. In addition, since the operator performs the operation so that the cooler cover 120 is applied to the protruding member 136 with the protruding member 136 as a mark at the time of attachment, the workability is improved and the working time can be shortened. Therefore, it is possible to improve the yield and suppress the product variation, and to secure a stable cooling performance.

In addition, when the protrusion member 136 is configured on the upper surface of the fourth heat insulating partition 113, the material cost and the mold cost for forming the protrusion member 136 can be reduced, and the number of steps in the manufacturing process can be reduced. Further, since the management of the two parts on the upper surface of the protruding member 136 and the fourth heat insulating partition 113 becomes the management of one part, the management cost can be reduced, the cost of the product can be reduced, and the selling price is also reduced. The sales rate can be improved.

In this case, regarding the portion corresponding to the protruding member 136 that contacts the outer periphery of the cooler cover 120, if the height dimension of the outer periphery of the cooler cover 120 is E, if B ≦ E, the red heat into the interior is not visible. . At this time, the width of the protrusion member 136 when it is configured by the upper surface of the protrusion member 136 or the fourth heat insulating partition 113 does not need to be large, and may be several. As a result, it is possible to reduce the material cost and improve the yield when manufacturing parts.

Furthermore, the shape of the wind direction guide part 122 in the cold air return port 135 in the present embodiment will be described.

The wind direction guide part 122 has a shape extending from the inner side to the rear cooler side, and the shape from the wind direction guide part 122 in the upper return part to the wind direction guide part 122 in the lower return part is lengthened toward the defrost heater 132 side. ing.

This not only improves the cooling capacity by reducing the ventilation resistance of the cool air return port 135, but also has an effect of easily suppressing the inflow of warm air into the cabinet due to radiant heat from the defrost heater 132 during defrosting. . If the inflow of warm air can be reduced, the rise in the internal temperature during defrosting can be suppressed, the cooling after defrosting can be performed with low input, and the internal temperature can be restored in a short time. Long-term storage is possible by suppressing quality degradation. Furthermore, energy saving can be realized.

Further, the rear end of the wind direction guide part 122 (upper wind direction guide part) located above is positioned higher than the line connecting the respective rear ends of the wind direction guide part 122 and the center of the defrost heater 132.

As a result, since each wind direction guide part 122 appears to overlap the defrost heater 132 when viewed from the inside of the refrigerator, the red heat of the defrost heater 132 is visible even when the freezer compartment door is opened during defrosting of the refrigerator. Absent. In addition, there is an effect of suppressing the inflow of radiant heat from the defrost heater 132 during defrosting, and the function of suppressing the temperature rise in the chamber. At this time, warm air due to heat at the time of defrosting flows to the cooler side by each wind direction guide part 122, so that the defrosting efficiency can be improved and an energy saving effect by shortening the defrosting time can be achieved.

In addition, prevention of frost in the storage is also effective for suppressing warm air inflow into the storage. If there is a large amount of warm air flowing into the cabinet, especially frost formation will occur on the part that is in communication with the cabinet and on the top surface of the cabinet. There is a possibility that the part may drip and fall into the case inside. If it is the shape of this Embodiment, since the suppression of warm air inflow into a store | warehouse | chamber can be aimed at, the reliability by frost formation can be prevented even at the time of use of the refrigerator for about ten years or more, and quality is high. A refrigerator can be provided.

In addition, since the line connecting the inner end surface of the cool air return port from the wind direction guide portion 122 at the upper part of the cool air return port to the wind direction guide part 122 at the lower part of the cool air return port is made parallel to the draft angle shape of the back of the inner case, And the cool air return port 135 can be made more than a certain distance, and are not locally narrowed, and there is no decrease in the air volume due to an increase in the ventilation resistance of the air passage. Therefore, the cooling capacity is not reduced.

Further, in the recent trend of increasing capacity, making the interior case as large as possible leads to improved sales, but the line connecting the draft angle when molding the interior case and the interior end surface of the wind direction guide part 122 is parallel. It is said. For this reason, it is possible to realize the maximum actual volume with reduced invalid space when molding the inner case, and even when the capacity is increased, the wind direction guide portion 122 and the inner case do not hit, There is no need for cracks or contact noises when the internal case hits the wind direction guide portion 122.

Furthermore, the shortest distance between the end surface of the wind direction guide portion 122 on the defrost heater 132 side and the glass tube outer wall of the defrost heater 132 was set to 60 mm or more. Thus, since the temperature rise of the cooler cover 120 itself constituting the cool air return port 135 can be suppressed by the radiant heat from the defrost heater 132 at the time of defrosting, an excessive defrost time such as at the time of frost formation is suppressed. Even when it is extended, deformation due to temperature effects due to radiant heat does not occur. Moreover, since the shortest distance is set to 60 mm or more, the warm air from the defrost heater 132 at the time of defrosting flows to the cooler side and has an effect of making it easy to suppress the inflow into the refrigerator.

In this embodiment, since the type of refrigerant is isobutane, the temperature of the glass tube surface of the defrost heater 132 during defrosting is regulated to 394 ° C. or less. In addition, the material of the cooler cover 120 and the wind direction guide portion 122 used in the present embodiment is inexpensive PP (polypropylene), and the heat-resistant melting temperature of PP is about 200 degrees Celsius, and the ignition temperature is about 440 degrees Celsius. ℃. However, considering the actual use, the heat-resistant temperature is set to 135 degrees Celsius. That is, considering the worst condition, the temperature of the glass tube surface: 394 ° C., the material having PP as the heat resistant temperature of 135 ° C. or less is calculated, and the above shortest distance is 60 mm or more. The above calculations were derived using Stefan-Boltzmann's law.

(Second Embodiment)
FIG. 6 is a detailed longitudinal sectional view around the cooler of the refrigerator in the second embodiment of the present invention.

As shown in FIG. 6, it has the cooler 157 which is provided in the back surface of the refrigerator main body, and produces | generates cool air, and the defrost heater 182 which consists of a glass tube heater provided in the downward direction of the cooler 157. Below the defrost heater 182 is provided a drain pan 184 integrated with the lower surface of the freezer compartment that receives the defrost water that falls after the frost attached to the cooler 157 is melted. A cool air return port 185 through which the cool air that has cooled the freezer compartment 155 returns to the cooler 157 is provided below the cooler cover 170 that covers the cooler 157. The center of the defrost heater 182 is disposed above the upper surface of the fourth heat insulating partition 163 on the lower surface of the freezer compartment 155.

In the present embodiment, a protruding member 186 that protrudes toward the inner side of the freezer compartment 155 is disposed. Here, with reference to the upper surface of the fourth heat insulating partition 163, the distance to the lower end of the cold air return port 185 is A, the height to the upper surface of the protruding member 186 is B, and the distance to the center of the defrost heater 182 is C1. To do. Further, the overlapping margin in the height direction of the lower end of the cold air return port 185 and the protruding member 186 is set to 0 mm or more, that is, A ≦ B. At this time, if A ≦ C1 and C1 ≧ B ≧ A, the red heat from the defrost heater 182 at the time of defrosting can be made invisible, so when the freezer compartment door is opened at the time of defrosting of the refrigerator The defrosting heater 182 made of a glass tube heater does not give the user anxiety due to red heat.

(Third embodiment)
FIG. 7 is a detailed longitudinal sectional view around the cooler of the refrigerator in the third embodiment of the present invention.

As shown in FIG. 7, it has the cooler 207 provided in the back surface of a refrigerator main body which produces | generates cold air, and the defrost heater 232 which consists of a glass tube heater provided in the downward direction of the cooler 207. Below the defrost heater 232, a drain pan 234 integrated with the lower surface of the freezer compartment that receives the defrost water that falls after the frost attached to the cooler 207 is melted is provided. A cool air return port 235 through which the cool air that has cooled the freezer compartment 205 returns to the cooler 207 is provided below the cooler cover 220 that covers the cooler 207. The cold air return port 235 is provided with a wind direction guide portion 222, and the center of the defrost heater 232 is disposed above the upper surface of the fourth heat insulating partition portion 213. In addition, a protruding member 236 that protrudes toward the inside of the refrigerator is disposed on the lower surface of the freezer compartment 205.

In the present embodiment, the protruding member 236 is integrated with the cooler cover 220 and fixed in contact with a contact portion (not shown) with the lower surface of the freezer compartment 205 so that red heat inside the refrigerator is not visible. Yes. Furthermore, since the outer periphery of the cool air return port 235 that is easily deformed when the cold air return port 235 is greatly opened can be fixed, the size of the cold air return port 235 is restricted, and the opening area is ensured and sufficient cooling effect is obtained. Can demonstrate. In addition, since the worker works so that the contact portion touches the contact portion with the mark at the time of attachment, the workability is improved and the working time can be shortened. Therefore, it is possible to improve the yield and suppress the product variation, and to secure a stable cooling performance.

(Fourth embodiment)
FIG. 8 is a detailed cross-sectional view of the cooler room of the refrigerator in the fourth embodiment of the present invention.

As shown in FIG. 8, it has the cooler 257 which is provided in the back surface of the refrigerator main body, and produces | generates cool air, and the defrost heater 282 which consists of a glass tube heater provided in the downward direction of the cooler 257. Below the defrost heater 282 is provided a drain pan 284 that is integrated with the lower surface of the freezer compartment that receives the defrost water that falls after the frost attached to the cooler 257 is melted. Under the cooler cover 270 that covers the cooler 257, a cool air return port 285 for returning the cool air that has cooled the freezer compartment 255 to the cooler 257 is provided. The cool air return port 285 is provided with a wind direction guide portion 272, and the center of the defrost heater 282 is disposed above the upper surface of the fourth heat insulating partition portion 263. In addition, a protruding member 286 that protrudes toward the inside of the refrigerator is disposed on the lower surface of the freezer compartment 255.

A cover heater 283 that covers the defrost heater 282 is disposed above the defrost heater 282. The cover heater 283 has a glass tube diameter so that a water drop dripped from the cooler 257 at the time of defrosting directly falls on the surface of the glass tube constituting the defrost heater 282 that has become high temperature by defrosting, so that no squeak is generated. The dimensions are equal to or greater than the width.

In the present embodiment, the cover heater 283 is provided with an inclination in the front-rear direction, and the end surface of the cover heater 283 on the back side is raised with respect to the inside of the warehouse. Further, the cooler 257 has a pipe pattern in a staggered arrangement, and the cooler 257 is attached so that the cooling pipe is inclined to the inside of the cabinet.

During the cooling operation, the cool air returning from the cool air return port 285 to the cooler 257 via the wind direction guide portion 272 is likely to flow toward the cooler 257 along the inclination of the cover heater 283. For this reason, it is difficult for cold air to flow around the defrosting heater 282. Therefore, since the cool air smoothly and efficiently returns to the cooler 257, the heat exchange efficiency can be improved and the cooling capacity can be improved. As a result, a refrigerator excellent in energy saving can be provided.

In addition, since the amount of frost on the front side of the cooler 257 is conventionally increased at the time of defrosting, the defrosting at the center on the back side by tilting the cover heater 283 is performed on the front side of the cooler with a large amount of frost formation. There is a problem that defrosting is delayed and the entire defrosting time is extended.

In this embodiment, a cooler 257 having a staggered pipe pattern is used instead of the conventional inline pipe pattern. Since the staggered pipe pattern cooler 257 is attached to the inside of the cabinet so that the pipe is inclined, warm air during defrosting flows toward the inside of the warehouse due to the pipe inclination. Further, since the size of the cover heater 283 is equal to or larger than the diameter and width of the glass tube constituting the defrost heater 282, the warm air of the defrost heater 282 is not covered with the defrost heater 282. Also, it is configured to flow toward the cooler 257.

This allows the entire defrosting to be efficiently defrosted without partially defrosting the cooler 257, so that the partial defrosting delay and the entire defrosting time do not increase. As a result, the temperature inside the cabinet is not excessively increased due to the heat effect on the inside by the defrost heater 282 during defrosting.

That is, it is possible to provide a refrigerator with high energy saving performance by improving the cooling performance without causing an increase in the defrosting time due to the uneven frost of the cooler 257.

In addition, the defrosting efficiency can be improved by tilting the back side of the cover heater 283 upward.

(Fifth embodiment)
Hereinafter, a fifth embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 9 is a perspective view of the refrigerator in the fifth embodiment of the present invention. FIG. 10 is a longitudinal sectional view of a refrigerator in the fifth embodiment of the present invention. FIG. 11 is a longitudinal sectional view of the periphery of the refrigerator cooler in the fifth embodiment of the present invention. FIG. 12 is a detailed longitudinal sectional view of the periphery of the refrigerator cooler according to the fifth embodiment of the present invention.

As shown in FIGS. 9 to 12, the refrigerator main body 301 includes a metal (for example, iron plate) outer box 324, a hard resin (for example, ABS) inner box 325, an outer box 324, and an inner box 325 that open forward. Insulating body 326 made of rigid urethane foam filled with foam. The refrigerator main body 301 includes a refrigerating room 302 provided in an upper part, an upper freezing room 303 provided under the refrigerating room 302, and an ice making room 304 provided in parallel with the upper freezing room 303 under the refrigerating room 302. It has. Furthermore, the refrigerator main body 301 includes a vegetable compartment 306 provided at the lower part of the main body, an upper freezer compartment 303 installed in parallel, and a lower freezer compartment 305 provided between the ice making chamber 304 and the vegetable compartment 306. The front part of the upper freezer 303, ice making room 304, lower freezer room 305 and vegetable room 306 can be freely opened and closed by a drawer type upper freezer door 303a, ice making room door 304a, lower freezer door 305a and vegetable room door 306a. Is done. The front surface of the refrigerating room 302 is freely closed and closed by a double door refrigerating room door 302a.

The temperature of the refrigerating room 302 is normally set at 1 to 5 ° C., with the lower limit being the temperature at which it does not freeze for refrigerated storage. The temperature of the vegetable compartment 306 is often set to 2 ° C. to 7 ° C., which is the same as or slightly higher than that of the refrigerator compartment 302. If the temperature is lowered, the freshness of leafy vegetables can be maintained for a long time.

The temperature of the upper freezer compartment 303 and the lower freezer compartment 305 is normally set at −22 to −18 ° C. for frozen storage. However, in order to improve the frozen storage state, for example, at a low temperature of −30 to −25 ° C. Sometimes set.

Refrigeration room 302 and vegetable room 306 are called refrigeration temperature zones because the interior is set at a plus temperature. Further, the upper freezer compartment 303, the lower freezer compartment 305, and the ice making compartment 304 are called freezing temperature zones because the interior is set at a minus temperature. Further, the upper freezer compartment 303 may be a room that can be selected from a refrigeration temperature zone to a freezing temperature zone by using a damper mechanism or the like as a switching chamber.

The top surface portion of the refrigerator main body 301 is configured by a first top surface portion 308 and a second top surface portion 309 by providing a stepped recess toward the back of the refrigerator. A machine room 319 is provided in the second top surface portion 309 provided with a stepped recess. A compressor 317 disposed in the machine chamber 319 of the stepped recess, a dryer (not shown) for removing moisture, a capacitor (not shown), a heat radiating pipe (not shown), A refrigerant is sealed in a refrigeration cycle in which a capillary tube 318 and a cooler 307 are sequentially connected in an annular shape, and a cooling operation is performed. In recent years, a flammable refrigerant is often used as a refrigerant for environmental protection. In the case of a refrigeration cycle using a three-way valve or a switching valve, these functional components can be disposed in the machine room 319.

In addition, the refrigerator compartment 302, the ice making room 304, and the upper freezer compartment 303 are partitioned by a first heat insulating partition 310. Further, the ice making chamber 304 and the upper freezing chamber 303 are partitioned by a second heat insulating partition 311. Further, the ice making chamber 304, the upper freezer compartment 303, and the lower freezer compartment 305 are partitioned by a third heat insulating partition 312.

Since the second heat insulating partition part 311 and the third heat insulating partition part 312 are parts assembled after foaming of the refrigerator main body 301, foamed polystyrene is usually used as a heat insulating material, but in order to improve heat insulating performance and rigidity. Rigid urethane foam may be used. Furthermore, a highly heat-insulating vacuum heat insulating material may be inserted as the second heat insulating partition portion 311 and the third heat insulating partition portion 312 to further reduce the thickness of the partition structure.

In addition, by securing the operating part of the door frame and making the second heat insulating partition part 311 and the third heat insulating partition part 312 thin and abolished, a cooling air passage can be secured and the cooling capacity is improved. You can also. Further, by hollowing out the insides of the second heat insulating partition portion 311 and the third heat insulating partition portion 312 to form an air passage, the material can be reduced and the cost can be reduced.

Further, the lower freezer compartment 305 and the vegetable compartment 306 are partitioned by a fourth heat insulating partition 313.

Next, the configuration around the cooler in the present embodiment will be described.

A cooler chamber 323 is provided on the back of the refrigerator main body 301. A typical fin-and-tube type cooler 307 for generating cool air is a heat insulating partition wall in the cooler chamber 323. Including the rear region of the heat insulating partition 311 and the third heat insulating partition 312, the back of the lower freezer compartment 305 is disposed vertically in the vertical direction.

A cooler cover 320 made of aluminum or copper covering the cooler 307 is disposed in front of the cooler chamber 323, and the cool air that has cooled the lower freezing chamber 305 returns to the cooler 307 in the cooler cover 320. The cold air return port 335 is provided.

The cooler cover 320 includes a cooler front cover 337 inside the refrigerator and a cooler rear cover 338 on the cooler side. The cooler front cover 337 and the cooler rear cover 338 are disposed in front of the cooler 307. The heat-transfer suppression space 339 comprised by these is provided. The heat transfer suppression space 339 is configured from the upper end of the cold air return port 335 provided at the lower part of the cooler cover 320 to the lower end of the discharge port to the lower freezing chamber 305. If the height of the heat transfer suppression space 339 reaches the upper end of the cooler 307, there is an effect of suppressing heat transfer, but the position should be determined by the balance with the internal capacity and the case dimensions. In the present embodiment, the height of the heat transfer suppression space 339 is generally lower refrigeration from the lower side close to the defrost heater 332 of the cooler 307 to the third stage in consideration of the flow of warm air during defrosting. Up to the lower end of the discharge port to the chamber 305. The inside of the heat transfer suppression space 339 is an air layer.

Further, a metal heat transfer promotion member 340 is disposed on the cooler 307 side of the cooler rear cover 338. In the present embodiment, in consideration of cost, aluminum foil of t = 8 μm is used for heat transfer at the time of defrosting, the vertical dimension is from the lower end to the upper end of the cooler 307, and the horizontal dimension is between the fins of the cooler 307. To + 15mm to a large size. By this, heat transfer at the time of defrosting is accelerated | stimulated and the defrosting time shortening effect by the defrosting efficiency improvement is acquired. In order to obtain a further effect, an aluminum foil may be arranged in the inner box 325 on the back side of the cooler 307. Furthermore, when it is made of an aluminum plate having a thickness larger than that of the aluminum foil or a material having a higher thermal conductivity than aluminum (for example, copper), the effect of promoting heat transfer is further exhibited.

Further, a defrost warm air guide member 341 is provided at the cold air return port 335 of the cooler cover 320. The defrosting warm air guide member 341 has an upward angle from the inner side toward the cooler 307 side, and in the present embodiment, the angle is approximately 45 ° with respect to the horizontal. At this time, the defrost warm air guide part upper end 343 which is an upper end of the defrost warm air guide member 341 is arranged at a position higher than the cooler lower end 344. As a result, the return cold air circulated in the storage can take a large heat exchange area with respect to the cooler 307, so that the amount of heat exchange in the cooler 307 increases and the capacity of the cooler 307 can be improved. .

Further, a wind direction guide portion 322 is provided at the cold air return port 335. The interval between the wind direction guide portions 322 is 5 mm, and consideration is given to preventing the intrusion of fingers and securing the strength of the mold and the cooler cover 320. A part of the airflow direction guide part 322 is also given an upward angle in the same direction as the defrosting / warming air guide member 341 from the inner side toward the cooler 307 side.

In the vicinity of the cooler 307 (for example, the upper space), the cold air generated by the cooler 307 is stored in each storage room of the refrigerating room 302, the ice making room 304, the upper freezer room 303, the lower freezer room 305, and the vegetable room 306 by forced convection. A cold air blowing fan 316 for blowing air is disposed. Below the cooler 307, there is provided a defrost heater 332 made of a glass tube heater made of glass tube that defrosts frost adhering to the cooler 307 and the cool air blower fan 316 during cooling.

A cover heater 333 that covers the defrosting heater 332 is disposed above the defrosting heater 332 made of a glass tube heater, and the defrosting heater 332 in which water droplets dropped from the cooler 307 at the time of defrosting have become high temperature due to defrosting. The size of the glass tube is equal to or larger than the diameter and width of the glass tube so as not to generate a sizzling sound.

Below the defrost heater 332, a drain pan 334 integrated with the upper surface of the fourth heat insulating partition 313, which is the lower surface of the lower freezing chamber 305 that receives defrost water that has been defrosted and dropped from the chiller 307. Is arranged.

In addition, a diffuser (not shown) composed of a cooler front cover 337 is disposed in front of the cool air blower fan 316 so that the wind with a high static pressure from the cool air blower fan 316 is not lost as it is. It is discharged into the chamber.

Here, the drain pan 334 integrated with the upper surface of the fourth heat insulating partition 313 has a protruding member 336 on the lower surface of the lower freezing chamber 305 toward the inside of the cabinet, and is fixed by hooking the lower portion of the cooler cover 320. is doing. Since the protruding member 336 is disposed between the lower end of the cold air return port 335 and the defrost heater 332, red heat to the inside of the refrigerator is not visible, and the protruding member 336 is not covered with the cooler cover when viewed from the inside of the refrigerator. Since it is hidden at the lower end of the 320 cool air return port 335, the appearance is good and the appearance quality is improved.

As a refrigerant for a recent refrigeration cycle, isobutane, which is a flammable refrigerant with a low global warming potential, is used from the viewpoint of global environmental conservation. This hydrocarbon, isobutane, has a specific gravity of about twice that at normal temperature and atmospheric pressure (at 2.04 and 300K) compared to air. As a result, the refrigerant charging amount can be reduced as compared with the conventional case, and the cost is low. In addition, the amount of leakage when the flammable refrigerant leaks is reduced, and the safety can be further improved.

In the present embodiment, isobutane is used as the refrigerant, and the maximum temperature on the surface of the glass tube, which is the outline of the defrost heater 332 composed of the glass tube heater at the time of defrosting, is regulated as an explosion-proof measure. Therefore, in order to reduce the temperature of the glass tube surface, a double glass tube heater in which glass tubes are formed in a double manner is employed. In addition, as a means for reducing the temperature on the surface of the glass tube, a member (for example, an aluminum fin) having high heat dissipation can be wound around the surface of the glass tube. At this time, the external dimensions of the defrosting heater 332 can be reduced by using a single glass tube.

As means for improving the efficiency at the time of defrosting, in addition to the defrosting heater 332, a pipe heater in close contact with the cooler 307 may be used in combination. In this case, the defrosting of the cooler 307 is efficiently performed by direct heat transfer from the pipe heater. Furthermore, since the frost adhering to the drain pan 334 and the cool air blower fan 316 around the cooler 307 can be melted by the defrost heater 332, the defrost time can be shortened, and the internal temperature rise during energy saving and defrost time. Can be suppressed.

In addition, when the defrost heater 332 made of a glass tube heater and a pipe heater are combined, the capacity of the defrost heater 332 can be reduced by optimizing each other's heater capacity. If the heater capacity is lowered, the temperature of the outline of the defrost heater 332 during defrosting can also be lowered, so that red heat during defrosting can also be suppressed.

Next, cooling of the refrigerator will be described. For example, when the freezer compartment 305 rises in temperature due to intrusion heat from outside air, door opening and closing, etc., and the freezer compartment sensor (not shown) exceeds the starting temperature, the compressor 317 is started and cooling is performed. Be started. While the high-temperature and high-pressure refrigerant discharged from the compressor 317 finally reaches a dryer (not shown) disposed in the machine room 319, particularly in a heat radiating pipe (not shown) installed in the outer box 324. It is cooled and liquefied by heat exchange with the heat insulation body 326 made of air outside the outer box 324 or hard urethane foam in the warehouse.

Next, the liquefied refrigerant is depressurized by the capillary tube 318, flows into the cooler 307, and exchanges heat with the cool air in the vicinity of the cooler 307. The cold air that has undergone heat exchange is blown into the cabinet by a nearby cool air blower fan 316 to cool the inside of the cabinet. Thereafter, the refrigerant is heated, gasified, and returned to the compressor 317. When the inside of the refrigerator is cooled and the temperature of the freezer compartment sensor (not shown) falls below the stop temperature, the operation of the compressor 317 is stopped.

Although the cool air blowing fan 316 may be directly disposed in the inner box 325, it is disposed in the second heat insulating partition 311 assembled after foaming, and the manufacturing cost is reduced by performing block processing of the parts. You can also

Next, a description will be given of when the refrigerator is defrosted.

When the refrigerator is cooled, over time, the moisture in the air that has entered when opening and closing the door, the moisture adhering to the food put in the cabinet, and the moisture from the vegetables stored in the vegetable compartment 306, etc. Frost adheres to the cooler 307. If this frost grows, heat exchange efficiency will fall between the cooler 307 and circulating cold air, and the inside of a store | warehouse | chamber cannot fully be cooled, but it will finally become a slow cooling or an uncooled state. Therefore, in the refrigerator, it is necessary to defrost the frost adhering to the cooler 307 periodically.

In the refrigerator according to the present embodiment, the refrigerator is operated, and defrosting is automatically performed after a certain period of time. At the time of defrosting, the operation of the compressor 317 and the cold air blowing fan 316 is stopped, and the defrosting heater 332 composed of a glass tube heater is energized. The cooler 307 generally has a sensible heat change from −30 ° C. to 0 ° C., a latent heat change at 0 ° C., 0 ° C. due to the melting of the refrigerant staying in the cooler 307 and the frost adhering to the cooler 307. The temperature rises through a sensible heat change from ℃. Here, a defrost sensor (not shown) is attached to the cooler 307, and the energization of the defrost heater 332 is stopped when a predetermined temperature is reached. In the present embodiment, energization of the defrost heater 332 is stopped when the defrost sensor detects 10 ° C.

At this time, the energization of the defrosting heater 332 causes the surface of the glass tube to become high temperature, and the frost attached to the drain pan 334 and the cool air blower fan 316 around the cooler 307 and the cooler 307 is melted by radiant heat, whereby the cooler 307 is It is refreshing.

For example, in the case of low outside air of about 5 ° C., even if the frost in the cooler 307 is sufficiently defrosted, the temperature of the defrost sensor (not shown) is not easily raised during defrosting due to the outside air. The defrosting time tends to be longer. In this case, the state of sensible heat change of 0 ° C. or higher can be seen, and control for terminating the defrosting can be combined if a certain time or more has elapsed. As a result, despite the sufficient defrosting, the defrosting time becomes longer due to insufficient temperature rise of the cooler 307 in low outside air, and the temperature rise due to unnecessary heater input and radiant heat into the chamber. Further, the temperature rise due to the cooling stop at the time of defrosting can be suppressed.

About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

As in this embodiment, a refrigerator layout configuration in which the vegetable compartment 306 is installed below, the lower freezer compartment 305 is installed in the middle, and the refrigerator compartment 302 is installed above is often used from the viewpoint of usability and energy saving. ing. In addition, in accordance with the viewpoint of the internal capacity and the trend of increasing the amount of frozen food used, refrigerators are provided that have a large internal case size for the lower freezer compartment 305 to improve the capacity.

At this time, if the inside case is taken large, the size of the cooler cover 320 on the back surface is reduced, the temperature inside the cooler 307 and the cooler chamber 323 is increased during defrosting, and further from the defrost heater 332. The temperature of the frozen food stored in the freezer compartment is affected by radiant heat and convection. Therefore, in the present embodiment, the defrosting / warming guide member 341 provided in the heat transfer suppression space 339 constituted by the cooler front cover 337 and the cooler rear cover 338 and the cool air return port 335 is a warehouse at the time of defrosting. The thermal effect on the inside is suppressed. In the present embodiment, the inside of the heat transfer suppression space 339 is an air layer, and it is possible to suppress heat conduction to the inside of the cooler 307 due to a rise in temperature around the cooler 307 due to radiant heat from the defrost heater 332. I can do it. For this reason, since the temperature influence on the food stored in the refrigerator, particularly on the cooler side, can be reduced, deterioration of the food can be suppressed and long-term storage can be achieved. The thermal conductivity of the air layer is approximately 0.03 W / mK. For example, even when the internal temperature is −25 ° C. and the temperature in the cooler room during defrosting is increased to 20 ° C., the heat insulation of the air layer causes The internal temperature only rises to -17 ° C. At this time, the thickness of the air layer, that is, the internal dimension of the heat transfer suppression space 339 is 13.4 mm. Therefore, even during defrosting, the temperature rise is −12 ° C. or less where the frozen food or ice cream melts and deteriorates in quality, so that deterioration in quality can be suppressed even during long-term storage.

In addition to the temperature effect on the food in the cabinet, it is possible to eliminate the location where the temperature locally decreases in the cabinet, so the moisture sublimated from the moisture attached to the food when the door is opened and closed or when the food is added. However, it also has an effect of preventing the cooler cover 320 from adhering as frost. As a result, the dehumidifying performance of the cooler 307 can be secured, and an auxiliary heater for preventing frost formation is not used.

In addition, being able to reduce the temperature influence on the inside of the cabinet at the time of defrosting has the effect of reducing the amount of load in the cabinet at the time of defrosting. Therefore, since the amount of cooling load after the defrosting time is reduced, it is possible to obtain an energy saving effect by reducing the operation speed of the compressor 317 and shortening the operation time required for cooling the interior after the defrosting time.

Further, since the defrost warm air guide member 341 is arranged with an upward angle of 45 ° from the inner side toward the cooler 307 side, convection due to radiant heat from the defrost heater 332 during defrosting. Becomes easy to go to the cooler 307, and the frost attached to the cooler 307 can be efficiently melted. Therefore, the energization time of the defrost heater 332 can be reduced, and energy saving is achieved by reducing the electric input. At this time, the defrosting time is reduced because the cooling load amount after the defrosting time is reduced by the suppression of the temperature rise by shortening the non-cooling operation time by the shortening of the defrosting time and the temperature rise suppression by the heat generation of the defrosting heater 332 itself. An energy saving effect can also be obtained by reducing the operation speed of the compressor 317 required for the subsequent cooling of the interior and shortening the operation time.

Furthermore, the defrosting warm air guide member 341 facilitates the flow of convection due to radiant heat from the defrosting heater 332 during defrosting to the cooler 307, which also has the effect of suppressing the inflow of heat into the cabinet. There is also a function to suppress the rise. The frozen food stored in the refrigerator deteriorates due to the effects of frost burning and heat fluctuation due to the inflow of warm air during defrosting, but even when stored for a long time due to the effect of the defrosting warm air guide member 341 Can be prevented.

In the present embodiment, the angle of the defrosting warm air guide member 341 is set to 45 ° upward, but the upward angle also depends on how the return cold air flows, how the warm air flows during defrosting, the internal capacity, and the mold. The angle should be determined in consideration of the ease of manufacturing.

Further, since the defrosting / warming guide member 341 is integrally formed with the cooler rear side cover 338, the material cost and mold cost for creating the defrosting / warming guide member 341 can be reduced, and the number of steps in the manufacturing process can be reduced. Can be reduced. Moreover, since the shape including the draft angle of the mold can be simplified by adopting the configuration of the cooler rear cover 338, the mold cost can be further reduced. In addition, since the management of two parts, the defrosting / warming guide member 341 and the cooler rear cover 338, is managed as one part, the management cost can be reduced, the cost of the product can be reduced, and the selling price can be reduced. The sales rate can be improved.

On the other hand, the defrosting / warming guide member 341 can be formed integrally with the cooler front side cover 337. In this case as well, the same effect as in the case of being configured integrally with the cooler rear cover 338 can be obtained. In the present embodiment, the defrosting / warming guide member 341 is configured integrally with the cooler rear cover 338, but the configuration form of the cooler cover 320, ease of manufacturing, mold configuration, cost, and the like are considered. It is desirable to implement the best mode.

In addition, a part of the wind direction guide portion 322 provided in the cool air return port 335 below the cooler cover 320 has an inclination in the same direction as the defrost warm air guide member 341, and from the inner side toward the cooler side. It is arranged at an upward angle. As a result, the wind direction guide portions appear to overlap the defrost heater 332 when viewed from the inside of the cabinet, and therefore the red heat of the defrost heater 332 is not visible even when the freezer compartment door is opened during defrosting of the refrigerator. In the present embodiment, the angle of the wind direction guide portion 322 is the same as the draft angle of the mold, but the angle may be determined in consideration of the flow of return cold air and the flow of warm air during defrosting.

Furthermore, since the convection due to the radiant heat from the defrost heater 332 during defrosting easily goes to the cooler 307 via the defrost warm air guide member 341, it is possible to further suppress the inflow of warm air into the cabinet and at the time of defrosting. Efficiency can be improved.

In addition, since a part of the airflow direction guide portion 322 and the defrosting warm air guide member 341 are inclined upward in the same direction, it is possible to suppress the resistance to sucking in the return cold air during cooling, and thus the circulating air volume can be increased. The amount of heat exchange in the cooler 307 increases, the evaporation temperature rises, and energy can be saved by improving the refrigeration cycle efficiency. In addition, since the time which cools the inside of a store | warehouse | chamber can be reduced by the improvement of the heat exchange amount of the cooler 307, and the increase in circulating air volume, the amount of frost formation to the cooler 307 by shortening of cooling operation time can also be reduced. . As a result, the defrost cycle of the cooler 307 can be extended, and the number of inputs of the defrost heater 332 can be reduced and the input required for cooling the inside of the cabinet after the temperature inside the chamber has been increased due to defrosting can be further reduced. be able to.

Further, the defrost warm air guide member 341 is disposed between the upper end of the cool air return port 335 of the cooler rear cover 338 or the lower end of the basic cross-sectional shape and the cooler lower end 344, that is, the defrost warm air guide portion. Since the upper end 343 is located higher than the cooler lower end 344, the heat exchange area between the return cold air and the cooler 307 can be increased. Therefore, the area to be frosted by the cooler 307 is increased, and deterioration of the cooling capacity at the time of frosting can be suppressed. This makes it possible to extend the time required to operate the refrigerator and require defrosting, and to reduce the number of inputs of the defrosting heater 332 and to reduce the input required for cooling the interior after the internal temperature rise due to defrosting. Further energy saving can be performed.

When the ventilation resistance is reduced, the circulation air volume of the cool air blowing fan 316 is increased when the fan voltage is the same. FIG. 13 shows an image of characteristics of ventilation resistance and air volume. As shown in FIG. 13, in the cooling performance of the refrigerator, the circulation air volume increases from Q1 to Q2 when the ventilation resistance is reduced from point 1 to point 2 P1 to P2 due to the characteristics of the fan.

Furthermore, when the performance can be secured with the same air volume, the same air volume can be obtained by reducing the number of fan rotations of the cool air blowing fan 316. In this case, the characteristic moves from the point 2 to the point 3, and the input is reduced by a decrease in the fan rotation speed, and energy saving as an electric input can be achieved. Furthermore, since the wind noise of the cool air blower fan 316 can be reduced by lowering the fan rotation speed, noise is not a concern even in a quiet environment with low ambient noise such as at night.

In addition, in order to suppress the warm air inflow into the warehouse by the wind direction guide portion 322 and the defrost warm air guide member 341, it is also effective to prevent frost formation in the warehouse. If there is a large amount of warm air flowing into the cabinet, especially frost formation will occur on the part that is in communication with the cabinet and on the top surface of the cabinet. There is a possibility that the part may drip and fall into the case inside. If it is the shape of this Embodiment, since the suppression of warm air inflow into a store | warehouse | chamber can be aimed at, the reliability by frost formation can be prevented even at the time of use of the refrigerator for about ten years or more, and quality is high. A refrigerator can be provided.

By properly configuring the heat transfer suppression space 339, the defrost warm air guide member 341, and the wind direction guide portion 322, a further energy saving effect can be achieved by reducing the effect of heat inside the chamber during defrost and improving the defrost efficiency.

In addition, in this Embodiment, although the comprised heat-transfer suppression space inside was made into the air layer, for example, the heat insulation performance made into hard urethane foam with high heat insulation performance and low heat conductivity, foamed polystyrene (foamed polystyrene), and foamed polyethylene. By using a member, the effect of temperature can be further reduced, so that a further effect can be exhibited.

In addition, the shortest distance between the end surface of the wind direction guide portion 322 on the defrost heater 332 side and the outer wall of the glass tube of the defrost heater 332 was set to 60 mm or more. Thereby, the temperature rise of the cooler cover 320 itself that constitutes the cool air return port 335 can be suppressed by the radiant heat from the defrost heater 332 at the time of defrosting. For this reason, even if the defrosting time is excessively extended, such as during frosting, deformation due to temperature effects due to radiant heat does not occur. Moreover, since the shortest distance is set to 60 mm or more, the warm air from the defrost heater 332 at the time of defrosting flows to the cooler side and has an effect of making it easy to suppress the inflow into the refrigerator.

In this embodiment, since the type of refrigerant is isobutane, the temperature of the glass tube surface of the defrost heater 332 at the time of defrosting is regulated to 394 degrees Celsius or less. In addition, the material of the cooler cover 320 and the wind direction guide portion 322 used in the present embodiment is inexpensive PP (polypropylene), the heat-resistant melting temperature of PP is about 200 ° C., and the ignition temperature is about 440 ° C. ℃. However, considering the actual use, the heat-resistant temperature is set to 135 degrees Celsius. That is, considering the worst condition, the temperature at the surface of the glass tube of the defrost heater 332: 394 degrees Celsius, the material having PP as a heat resistant temperature of 135 degrees Celsius or less is calculated, and the minimum distance is 60 mm or more. The above calculations were derived using Stefan-Boltzmann's law.

(Sixth embodiment)
FIG. 14 is a detailed longitudinal sectional view around the cooler of the refrigerator in the sixth embodiment of the present invention.

As shown in FIG. 14, it has the cooler 357 provided in the back surface of a refrigerator main body, and produces | generates cool air, and the defrost heater 382 which consists of a glass tube heater provided in the downward direction of the cooler 357. Below the defrost heater 382, a drain pan 384 integrated with the lower surface of the lower freezing chamber 355 that receives the defrost water that falls after the frost attached to the cooler 357 is melted is provided. In addition, a cooler cover 370 that covers the cooler 357 including the cool air return port 385 for returning the cool air that has cooled the lower freezing chamber 355 to the cooler 357 is disposed.

A defrost / warm air guide member 391 is provided at the cool air return port 385 of the cooler cover 370, and the defrost / warm air guide member 391 has an upward angle from the inner side toward the cooler 357 side. In general, the angle is 45 °. Further, a wind direction guide portion 372 is provided in the cold air return port 385 provided in the lower part of the cooler cover 370. A part of the wind direction guide portion 372 is also given an upward angle in the same direction as the defrost warm air guide member 391 from the inner side toward the cooler 357 side.

In the present embodiment, the center of the defrost heater 382 is disposed at a position above the bottom basic surface of the lower freezing chamber 355 that is the upper surface of the fourth heat insulating partition 363. As a result, the shape of the drain pan 384 integrated with the lower surface of the lower freezer compartment can be made substantially horizontal, the ineffective space for installing the defrost heater 382 can be reduced, and the internal volume is increased. I can do it.

Also, the fact that the depth of the drain pan 384 can be reduced can reduce the cost of the mold when molding the constituent parts, leading to a cost reduction. In addition, it is possible to suppress deformation when foaming rigid urethane foam that is in close contact with the outer box of the refrigerator body and the inside of the inner box, improving product yield and reducing disposal costs. Since the workability at the time is also improved, a refrigerator with good appearance quality can be provided.

At this time, a part of the airflow direction guide portion 372 provided in the cool air return port 385 below the cooler cover 370 has an inclination in the same direction as the defrost warm air guide member 391, and the cooler 357 side is provided from the inside of the refrigerator. It is arranged at an upward angle. As a result, each wind direction guide portion 372 appears to overlap with the defrost heater 382 when viewed from the inside of the cabinet. Therefore, even when the freezer compartment door is opened at the time of defrosting the refrigerator, the defrost heater 382 at the time of defrosting. Because it can hide the red fever from the camera, it does not give the user anxiety.

(Seventh embodiment)
FIG. 15 is a detailed cross-sectional view of the refrigerator compartment of the refrigerator in the seventh embodiment of the present invention.

As shown in FIG. 15, it has a cooler 407 that is provided on the back surface of the refrigerator main body and generates cold air, and a defrost heater 432 that is composed of a glass tube heater provided below the cooler 407. Below the defrost heater 432, a drain pan 434 integrated with the lower surface of the lower freezer compartment 405 that receives the defrost water that falls after the frost attached to the cooler 407 is melted is provided. In addition, a cooler cover 420 that covers the cooler 407 provided with the cool air return port 435 for returning the cool air that has cooled the lower freezer compartment 405 to the cooler 407 is disposed.

A defrost / warm air guide member 441 is provided at the cool air return port 435 of the cooler cover 420, and the defrost / warm air guide member 441 has an upward angle from the inner side toward the cooler 407 side. In general, the angle is 45 °. Further, a wind direction guide portion 422 is provided in the cold air return port 435 provided in the lower portion of the cooler cover 420. A part of the airflow direction guide part 422 also has an upward angle in the same direction as the defrosting warm air guide member 441 from the inside of the cabinet toward the cooler 407 side.

In the present embodiment, the cover heater 433 covering the upper portion of the defrost heater 432 is inclined in the front-rear direction, and the end face of the cover heater 433 on the back side is raised with respect to the inside of the warehouse. The cooler 407 has a staggered pipe pattern, and the cooler 407 is attached so that the cooling pipe is inclined to the inside.

Thereby, at the time of defrosting, the flow of warm air first flows around the back side of the cooler 407 and then flows toward the inside of the warehouse due to the pipe inclination. Therefore, it is difficult to flow into the cool air return port 435, and the warm air inflow into the chamber is suppressed by the defrost warm air guide member 441 and the wind direction guide portion 422, which is effective in reducing the increase in the chamber temperature.

In addition, since the convection of defrost warm air can be produced centering on the part where temperature is low and it is easy to frost by making the inlet pipe of the cooler 407 into the back side, it can defrost efficiently.

In addition, the defrosting efficiency can be further improved by tilting the back side of the cover heater 433 upward.

(Eighth embodiment)
FIG. 16 is a detailed cross-sectional view of the refrigerator compartment of the refrigerator in the eighth embodiment of the present invention.

As shown in FIG. 16, it has the cooler 457 which is provided in the back surface of a refrigerator main body, and produces | generates cool air, and the defrost heater 482 which consists of a glass tube heater provided in the downward direction of the cooler 457. Below the defrost heater 482, a drain pan 484 integrated with the lower surface of the lower freezing chamber 455 that receives defrost water that has fallen after the frost attached to the cooler 457 is melted is provided. Further, a cooler cover 470 that covers the cooler 457 provided with the cool air return port 485 for returning the cool air that has cooled the lower freezing chamber 455 to the cooler 457 is disposed.

A defrost / warm air guide member 491 is provided at the cool air return port 485 of the cooler cover 470, and the defrost / warm air guide member 491 has an upward angle from the inner side toward the cooler 457 side. In general, the angle is 45 °. In addition, a wind direction guide portion 472 is provided in the cold air return port 485 provided in the lower part of the cooler cover 470. The airflow direction guide part 472 also has an upward angle in the same direction as the defrosting / warming guide member 491 from the inner side toward the cooler 457 side.

And in this Embodiment, the wind direction guide part 472 and the defrost warm air guide member 491 are connected, and the connection wind direction guide 495 used as a large sized wind direction guide part is comprised. As a result, convection due to radiant heat from the defrost heater 482 at the time of defrosting can more easily flow to the cooler 457 and the frost adhering to the cooler 457 can be efficiently melted. Energy saving by reducing electric input.

Also, the effect of suppressing the inflow of radiant heat from the defrost heater 482 during defrosting is increased, and the temperature rise in the chamber is further suppressed.

Also, by configuring the connecting wind direction guide 495 integrally with the cooler front cover 487 or the cooler rear cover 488, material costs and mold costs can be reduced, and man-hours in the manufacturing process can be reduced.

(Ninth embodiment)
The ninth embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 17 is a perspective view of the refrigerator in the ninth embodiment of the present invention. FIG. 18 is a longitudinal sectional view of a refrigerator in the ninth embodiment of the present invention. FIG. 19 is a longitudinal sectional view of the vicinity of the refrigerator cooler in the ninth embodiment of the present invention. FIG. 20 is a detailed longitudinal sectional view around the cooler of the refrigerator in the ninth embodiment of the present invention.

As shown in FIGS. 17 to 20, the refrigerator main body 501 includes a metal (for example, iron plate) outer box 524 that opens forward, a hard resin (for example, ABS) inner box 525, an outer box 524, and an inner box 525. Insulating body 526 made of rigid urethane foam filled with foam. The refrigerator main body 501 includes a refrigerating room 502 provided in an upper part, an upper freezing room 503 provided under the refrigerating room 502, and an ice making room 504 provided in parallel with the upper freezing room 503 under the refrigerating room 502. It has. The refrigerator body 501 further includes a vegetable room 506 provided at the lower part of the body, an upper freezer room 503 installed in parallel, and a lower freezer room 505 provided between the ice making room 504 and the vegetable room 506. Yes. The front freezing chamber 503, the ice making chamber 504, the lower freezing chamber 505, and the vegetable compartment 506 are open and closed freely by a drawer-type upper freezing compartment door 503a, ice making compartment door 504a, lower freezing compartment door 505a, and vegetable compartment door 506a. Is done. The front surface of the refrigerator compartment 502 is closed freely, for example, by a double door type refrigerator compartment door 502a.

The temperature of the refrigerator compartment 502 is normally set at 1 to 5 ° C., with the lower limit being the temperature at which it does not freeze for refrigerated storage. The temperature of the vegetable room 506 is often set to 2 ° C. to 7 ° C., which is the same as or slightly higher than that of the refrigerator room 502. If the temperature is lowered, the freshness of leafy vegetables can be maintained for a long time.

The temperature of the upper freezer compartment 503 and the lower freezer compartment 505 is normally set at −22 to −18 ° C. for frozen storage. However, in order to improve the frozen storage state, for example, at a low temperature of −30 to −25 ° C. Sometimes set.

The refrigerator compartment 502 and the vegetable compartment 506 are called refrigeration temperature zones because the interior is set at a plus temperature. Further, the upper freezer compartment 503, the lower freezer compartment 505, and the ice making compartment 504 are called freezing temperature zones because the interior is set at a minus temperature. Moreover, the upper freezer compartment 503 may be a room that can be selected from a refrigeration temperature zone to a freezing temperature zone by using a damper mechanism or the like as a switching chamber.

The top surface portion of the refrigerator main body 501 is configured with a first top surface portion 508 and a second top surface portion 509 by providing a stepped recess toward the back of the refrigerator. A machine room 519 is provided in the second top surface portion 509 provided with a stepped recess. A compressor 517 disposed in the machine chamber 519 of the stepped recess, a dryer (not shown) for removing moisture, a capacitor (not shown), a heat radiating pipe (not shown), A refrigerant is enclosed in a refrigeration cycle in which a capillary tube 518 and a cooler 507 are sequentially connected in an annular shape, and a cooling operation is performed. In recent years, a flammable refrigerant is often used as a refrigerant for environmental protection. In the case of a refrigeration cycle using a three-way valve or a switching valve, these functional components can be arranged in the machine room 519.

Further, the refrigerator compartment 502, the ice making room 504, and the upper freezing room 503 are partitioned by a first heat insulating partition 510. In addition, the ice making chamber 504 and the upper freezing chamber 503 are partitioned by a second heat insulating partition 511. Further, the ice making chamber 504, the upper freezer compartment 503, and the lower freezer compartment 505 are partitioned by a third heat insulating partition 512.

Since the second heat insulating partition part 511 and the third heat insulating partition part 512 are parts assembled after foaming of the refrigerator main body 501, foamed polystyrene is usually used as a heat insulating material, but in order to improve heat insulating performance and rigidity. Rigid urethane foam may be used. Further, a highly heat-insulating vacuum heat insulating material may be inserted as the second heat-insulating partition portion 511 and the third heat-insulating partition portion 512 to further reduce the thickness of the partition structure.

In addition, by securing the operating part of the door frame and thinning or eliminating the shape of the second heat insulating partition part 511 and the third heat insulating partition part 512, a cooling air passage can be secured and the cooling capacity is improved. You can also. Further, by hollowing out the insides of the second heat insulating partition portion 511 and the third heat insulating partition portion 512 to form an air passage, the material can be reduced and the cost can be reduced.

The lower freezer compartment 505 and the vegetable compartment 506 are partitioned by a fourth heat insulating partition 513.

Next, the configuration around the cooler in the present embodiment will be described.

A cooler chamber 523 is provided on the back surface of the refrigerator body 501, and in the cooler chamber 523, a fin-and-tube type cooler 507 that generates cool air is a heat insulation partition wall. Including the rear region of the heat insulating partition 511 and the third heat insulating partition 512, the back surface of the lower freezer compartment 505 is vertically arranged in the vertical direction.

A cooler cover 520 that covers a cooler 507 provided with a cool air return port 535 for returning cool air that has cooled the freezer room to the cooler is disposed inside the front chamber of the cooler chamber 523. The material of the cooler 507 is aluminum or copper.

The cooler cover 520 includes a cooler front cover 537 on the inside of the cabinet and a cooler rear cover 538 on the cooler side. The cooler front cover 537 and the cooler rear cover 538 are disposed in front of the cooler 507. The heat-transfer suppression space 539 comprised by these is provided. The heat transfer suppression space 539 is configured from the upper end of the cool air return port 535 provided in the lower part of the cooler cover 520 to the lower end of the discharge port to the lower freezer compartment 505. If the height of the heat transfer suppression space 539 is up to the upper end of the cooler 507, there is an effect of suppressing heat transfer, but the position should be determined by the balance with the internal capacity and the case dimensions. In the present embodiment, the height of the heat transfer suppression space 539 is generally lower refrigeration from the lower side close to the defrost heater 532 of the cooler 507 to the third stage in consideration of the flow of warm air during defrosting. Up to the lower end of the discharge port to the chamber 505. Further, the inside of the heat transfer suppression space 539 is an air layer.

Also, a metal heat transfer promoting member 540 is disposed on the cooler 507 side of the cooler rear cover 538. In this embodiment, considering the cost, aluminum foil of t = 8 μm is used for heat transfer during defrosting, the vertical dimension is from the lower end to the upper end of the cooler 507, and the horizontal dimension is between the fins of the cooler 507. To + 15mm to a large size. By this, heat transfer at the time of defrosting is accelerated | stimulated and the defrosting time shortening effect by the defrosting efficiency improvement is acquired. In order to obtain a further effect, an aluminum foil may be disposed in the inner box 525 on the back side of the cooler 507. Furthermore, when it is made of an aluminum plate having a thickness larger than that of the aluminum foil or a material having a higher thermal conductivity than aluminum (for example, copper), the effect of promoting heat transfer is further exhibited.

Further, a defrost warm air guide member 541 is provided at the cool air return port 535 of the cooler cover 520. The defrosting warm air guide member 541 has an upward angle from the inner side toward the cooler 507 side, and in the present embodiment, the angle is approximately 45 ° with respect to the horizontal. At this time, the defrost warm air guide part upper end 543 which is the upper end of the defrost warm air guide member 541 is disposed at a position higher than the cooler lower end 544. As a result, the return cold air circulated in the storage can take a large heat exchange area with respect to the cooler 507, so that the amount of heat exchange in the cooler 507 increases and the capacity of the cooler 507 can be improved. .

Furthermore, a wind direction guide portion 522 is provided at the cold air return port 535. The interval between the wind direction guide portions 522 is 5 mm, and consideration is given to preventing the intrusion of fingers and securing the strength of the mold and the cooler cover 520. A part of the wind direction guide portion 522 is also provided with an upward angle in the same direction as the defrosting / warming guide member 541 from the inner side toward the cooler 507 side.

In the vicinity of the cooler 507 (for example, the upper space), the cold air generated by the cooler 507 is stored in each storage room of the refrigerator compartment 502, the ice making room 504, the upper freezer room 503, the lower freezer room 505, and the vegetable room 506 by forced convection. A cold air blowing fan 516 for blowing air is disposed. Below the cooler 507, there is provided a defrost heater 532 composed of a glass tube heater made of a glass tube that defrosts frost adhering to the cooler 507 and the cool air blower fan 516 during cooling.

A cover heater 533 that covers the defrosting heater 532 is disposed above the defrosting heater 532 made of a glass tube heater, and the defrosting heater 532 in which water droplets dripped from the cooler 507 at the time of defrosting have become high temperature due to defrosting. The size of the glass tube is equal to or larger than the diameter and width of the glass tube so as not to generate a sizzling sound.

Below the defrost heater 532, a drain pan 534 integrated with the upper surface of the fourth heat insulating partition 513, which is the lower surface of the lower freezing chamber 505 that receives defrost water that falls after the frost attached to the cooler 507 is melted. Has been placed.

In addition, a diffuser (not shown) composed of a cooler front cover 537 is disposed in front of the cool air blower fan 516 so that the wind with a high static pressure from the cool air blower fan 516 is not lost as it is. It is discharged into the chamber.

Here, the drain pan 534 integrated with the upper surface of the fourth heat insulating partition 513 has a protruding member 536 on the lower surface of the lower freezer compartment 505 toward the inside of the cabinet, and is fixed by hooking the lower portion of the cooler cover 520. is doing. Since the protruding member 536 is disposed between the lower end of the cool air return port 535 and the defrost heater 532, red heat to the inside of the refrigerator is not visible, and the protruding member 536 is not covered with the cooler cover when viewed from the inside of the refrigerator. Since it is hidden at the lower end of the cool air return port 535, the appearance is good and the appearance quality is improved.

As a refrigerant for a recent refrigeration cycle, isobutane, which is a flammable refrigerant with a low global warming potential, is used from the viewpoint of global environmental conservation. This hydrocarbon, isobutane, has a specific gravity of about twice that at normal temperature and atmospheric pressure (at 2.04 and 300K) compared to air. As a result, the refrigerant charging amount can be reduced as compared with the conventional case, and the cost is low. In addition, the amount of leakage when the flammable refrigerant leaks is reduced, and the safety can be further improved.

In the present embodiment, isobutane is used as the refrigerant, and the maximum temperature on the surface of the glass tube, which is the outline of the defrost heater 532 composed of the glass tube heater at the time of defrosting, is regulated as an explosion-proof measure. Therefore, in order to reduce the temperature of the glass tube surface, a double glass tube heater in which glass tubes are formed in a double manner is employed. In addition, as a means for reducing the temperature on the surface of the glass tube, a member (for example, an aluminum fin) having high heat dissipation can be wound around the surface of the glass tube. At this time, the external dimensions of the defrosting heater 532 can be reduced by using a single glass tube.

As means for improving the efficiency at the time of defrosting, in addition to the defrosting heater 532, a pipe heater in close contact with the cooler 507 may be used in combination. In this case, the defrosting of the cooler 507 is efficiently performed by direct heat transfer from the pipe heater. Furthermore, since the frost adhering to the drain pan 534 and the cool air blower fan 516 around the cooler 507 can be melted by the defrost heater 532, the defrost time can be shortened, and the internal temperature rises during energy saving and defrost time. Can be suppressed.

In addition, when the defrost heater 532 consisting of a glass tube heater and a pipe heater are combined, the capacity of the defrost heater 532 can be reduced by optimizing the heater capacity of each other. If the heater capacity is reduced, the temperature of the outline of the defrost heater 532 at the time of defrosting can also be lowered, so that red heat at the time of defrosting can also be suppressed.

Next, cooling of the refrigerator will be described. For example, when the freezer compartment 505 rises in temperature due to intrusion heat from outside air, door opening and closing, etc., and the freezer compartment sensor (not shown) reaches or exceeds the starting temperature, the compressor 517 is started and cooling is performed. Be started. While the high-temperature and high-pressure refrigerant discharged from the compressor 517 finally reaches the dryer (not shown) disposed in the machine room 519, particularly in a heat radiating pipe (not shown) installed in the outer box 524. The liquid is cooled and liquefied by heat exchange with the heat insulating body 526 made of air outside the outer box 524 or hard urethane foam in the warehouse.

Next, the liquefied refrigerant is depressurized by the capillary tube 518, flows into the cooler 507, and exchanges heat with the cool air in the vicinity of the cooler 507. The cold air that has undergone heat exchange is blown into the cabinet by a nearby cool air blower fan 516 to cool the inside of the cabinet. Thereafter, the refrigerant is heated, gasified, and returned to the compressor 517. When the inside of the refrigerator is cooled and the temperature of the freezer compartment sensor (not shown) becomes equal to or lower than the stop temperature, the operation of the compressor 517 is stopped.

Although the cool air blower fan 516 may be directly disposed in the inner box 525, the cool air blower fan 516 is disposed in the second heat insulating partition 511 that is assembled after foaming to reduce the manufacturing cost by performing block processing of the parts. You can also

Next, a description will be given of when the refrigerator is defrosted.

When the refrigerator is cooled, over time, the moisture in the air that has entered when opening and closing the door, the moisture adhering to the food put in the cabinet, the moisture from the vegetables stored in the vegetable compartment 506, etc. Frost adheres to the cooler 507. When this frost grows, the heat exchange efficiency is lowered between the cooler 507 and the circulating cold air, and the inside of the cabinet cannot be sufficiently cooled, and finally it becomes a slow cooling or uncooled state. Therefore, in the refrigerator, it is necessary to defrost frost adhering to the cooler 507 periodically.

In the refrigerator according to the present embodiment, the refrigerator is operated, and defrosting is automatically performed after a certain period of time. At the time of defrosting, the operation of the compressor 517 and the cold air blowing fan 516 is stopped, and the defrosting heater 532 composed of a glass tube heater is energized. The cooler 507 generally has a sensible heat change from −30 ° C. to 0 ° C., a latent heat change at 0 ° C., 0 ° C. due to the melting of the refrigerant staying inside the cooler 507 and the frost adhering to the cooler 507. The temperature rises through a sensible heat change from ℃. Here, a defrost sensor (not shown) is attached to the cooler 507, and the energization of the defrost heater 532 is stopped when a predetermined temperature is reached. In the present embodiment, energization of the defrost heater 532 is stopped when the defrost sensor detects 10 ° C.

At this time, the energization of the defrost heater 532 raises the surface of the glass tube, and the frost attached to the drain pan 534 and the cool air blower fan 516 around the cooler 507 and the cooler 507 is melted by the radiant heat, so that the cooler 507 is It is refreshing.

For example, in low outside air of about 5 ° C. or lower, even if the frost in the cooler 507 is sufficiently defrosted, the temperature of the defrost sensor (not shown) is sufficiently increased during defrosting due to the outside air. It is difficult to warm, and the defrosting time tends to be longer. In this case, the state of sensible heat change of 0 ° C. or higher can be seen, and control for terminating the defrosting can be combined if a certain time or more has elapsed. As a result, the defrosting time becomes longer due to insufficient temperature rise of the cooler 507 in low outside air, even though it is sufficiently defrosted, and the temperature rises due to unnecessary heater input and radiant heat into the chamber. Further, the temperature rise due to the cooling stop at the time of defrosting can be suppressed.

About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

As in this embodiment, a refrigerator layout configuration in which the vegetable compartment 506 is installed below, the lower freezer compartment 505 is installed in the middle, and the refrigerator compartment 502 is installed above is often used from the viewpoint of usability and energy saving. ing. In addition, refrigerators that increase the capacity by increasing the size of the case in the lower freezer compartment 505 have been put on the market in accordance with the viewpoint of the internal capacity and the increasing usage of frozen foods.

At this time, if the inside case is made large, the size of the cooler cover 520 on the back surface becomes small, the temperature rise in the cooler 507 and the cooler chamber 523 during defrosting, and further from the defrost heater 532 The temperature of the frozen food stored in the freezer compartment is affected by radiant heat and convection. Therefore, in this embodiment, the defrosting / warming guide member 541 provided in the heat transfer suppression space 539 formed by the cooler front side cover 537 and the cooler rear side cover 538 and the cool air return port 535 is a warehouse at the time of defrosting. The thermal effect on the inside is suppressed. In the present embodiment, the inside of the heat transfer suppression space 539 is an air layer, and it is possible to suppress heat conduction to the inside of the refrigerator even when the temperature around the cooler 507 increases due to radiant heat from the defrost heater 532. I can do it. For this reason, since the temperature influence on the food stored in the refrigerator, particularly on the cooler side, can be reduced, deterioration of the food can be suppressed and long-term storage can be achieved. The thermal conductivity of the air layer is approximately 0.03 W / mK. For example, even when the internal temperature is −25 ° C. and the temperature in the cooler room during defrosting is increased to 20 ° C., the heat insulation of the air layer causes The internal temperature only rises to -17 ° C. At this time, the thickness of the air layer, that is, the internal dimension of the heat transfer suppression space 539 is 13.4 mm. Therefore, even during defrosting, the temperature rise is −12 ° C. or less where the frozen food or ice cream melts and deteriorates in quality, so that deterioration in quality can be suppressed even during long-term storage.

In addition to the temperature effect on the food in the cabinet, it is possible to eliminate the location where the temperature locally decreases in the cabinet, so the moisture sublimated from the moisture attached to the food when the door is opened and closed or when the food is added. However, it also has an effect of preventing the cooler cover 520 from adhering as frost. As a result, the dehumidifying performance of the cooler 507 can be ensured, and an auxiliary heater for preventing frost formation is not used.

In addition, being able to reduce the temperature influence on the inside of the cabinet at the time of defrosting has the effect of reducing the amount of load in the cabinet at the time of defrosting. Therefore, since the amount of cooling load after the defrosting time is reduced, it is possible to obtain an energy saving effect by reducing the operation speed of the compressor 517 and shortening the operation time required for cooling the interior after the defrosting time.

Further, since the defrost warm air guide member 541 is disposed with an upward angle of 45 ° from the inside of the refrigerator toward the cooler 507 side, convection due to radiant heat from the defrost heater 532 during defrosting. Becomes easy to go to the cooler 507, and the frost adhering to the cooler 507 can be efficiently melted. Therefore, the energization time of the defrost heater 532 can be reduced, and the energy is saved by reducing the electric input. At this time, the defrosting time is reduced because the cooling load amount after the defrosting time is reduced by the suppression of the temperature rise by shortening the non-cooling operation time by the shortening of the defrosting time and the temperature rise suppression by the heat generation of the defrosting heater 532 itself. An energy saving effect can also be obtained by reducing the number of operation revolutions of the compressor 517 required for the subsequent cooling of the interior and shortening the operation time.

Furthermore, the defrosting / warming guide member 541 facilitates the flow of convection due to radiant heat from the defrosting heater 532 during defrosting to the cooler 507, which also has the effect of suppressing the inflow of heat into the cabinet. There is also a function to suppress the rise. The frozen food stored in the refrigerator deteriorates due to the effects of frost burning and heat fluctuation due to the inflow of warm air during defrosting, but even if it is stored for a long time due to the effect of the defrosting warm air guide member 541 Can be prevented.

In the present embodiment, the angle of the defrosting / warming guide member 541 is set to 45 ° upward, but the upward angle also depends on how the return cold air flows, how the warm air flows during defrosting, the internal capacity, and the mold. The angle should be determined in consideration of the ease of manufacturing.

In addition, since the defrosting / warming guide member 541 is configured integrally with the cooler rear side cover 538, the material cost and mold cost for creating the defrosting / warming guide member 541 can be reduced, and the number of steps in the manufacturing process can be reduced. Can be reduced. In addition, since the configuration including the cooler rear cover 538 can simplify the shape including the draft angle of the mold, the mold cost can be further reduced. In addition, since the management of two parts of the defrosting / warming guide member 541 and the cooler rear cover 538 is managed as one part, the management cost can be reduced, the cost of the product can be reduced, and the selling price is also reduced. The sales rate can be improved.

Note that the defrosting / warming guide member lower end 531 which is the lower end of the defrosting / warming guide member 541 is located closer to the cooler 507 than the drain pan inner end surface 530 which is the inner end surface of the drain pan 534. Thereby, when the frost adhering to the cooler 507 at the time of defrosting is melted, the defrost water dripped through the cooler rear cover 538 can be surely dropped into the drain pan 534. In the present embodiment, the distance between the drain pan inner side end surface 530 and the defrosting warm air guide member lower end 531 is 15.8 mm. This is a dimension in which water droplets of defrost water drip into the drain pan 534 even when the refrigerator is inclined 15 ° to the front side depending on the installation state of the refrigerator. In fact, when the refrigerator is installed in a state where it is inclined 15 ° to the front side, the size of the refrigerator itself falls down. Even in consideration of the dimensional variation of the parts surrounding the cooler 507, in this embodiment, since the defrost water to be dripped can be surely dropped into the drain pan 534, water enters the inside of the refrigerator. Therefore, it is possible to provide a high-quality refrigerator as a product.

On the other hand, the defrosting / warming guide member 541 can be formed integrally with the cooler front cover 537. In this case as well, the same effect as in the case of being configured integrally with the cooler rear cover 538 can be obtained. In the present embodiment, the defrosting / warming guide member 541 is configured integrally with the cooler rear cover 538. However, in consideration of the configuration of the cooler cover 520, ease of manufacturing, mold configuration, cost, and the like. It is desirable to implement the best mode.

In addition, a part of the wind direction guide portion 522 provided in the cool air return port 535 below the cooler cover 520 has an inclination in the same direction as the defrost warm air guide member 541 and is directed from the inner side toward the cooler side. Are arranged at an upward angle. As a result, since each wind direction guide portion appears to overlap the defrost heater 532 made of a glass tube heater when viewed from the inside of the refrigerator, even when the freezer compartment door is opened during defrosting of the refrigerator, the defrost heater 532 I can't see the red heat. In this embodiment, the upward angle of a part of the wind direction guide portion 522 is made the same as the draft angle of the mold, but the angle is set in consideration of the flow of return cold air and the flow of warm air during defrosting. It is good to decide.

Furthermore, since convection due to radiant heat from the defrost heater 532 during defrosting easily flows to the cooler 507 via the defrost warm air guide member 541, it is possible to further suppress the inflow of warm air into the cabinet and at the time of defrosting. Efficiency can be improved.

In addition, since a part of the airflow direction guide portion 522 and the defrosting warm air guide member 541 are inclined upward in the same direction, it is possible to suppress the resistance to sucking in the return cold air at the time of cooling, and thus the circulating air volume can be increased. The amount of heat exchange in the cooler 507 increases, the evaporation temperature rises, and energy can be saved by improving the refrigeration cycle efficiency. In addition, since the time which cools the inside of a store | warehouse | chamber can be reduced by the improvement of the heat exchange amount of the cooler 507, and the increase in circulating air volume, the amount of frost formation to the cooler 507 by shortening of cooling operation time can also be reduced. . As a result, the defrost cycle of the cooler 507 can be extended, the number of inputs of the defrost heater 532 can be reduced, and the input required for cooling the inside of the box after the inside temperature has been increased due to defrosting can be further saved. be able to.

Further, the defrosting / warming guide member 541 is disposed between the upper end of the cool air return port 535 or the lower end of the basic cross-sectional shape of the cooler rear cover 538 and the cooler lower end 544, that is, the defrosting / warming guide portion. Since the upper end 543 is located at a position higher than the cooler lower end 544, the heat exchange area between the return cold air and the cooler 507 can be increased. Therefore, the area to be frosted by the cooler 507 is increased, and deterioration of the cooling capacity at the time of frosting can be suppressed. This makes it possible to extend the time required to operate the refrigerator and require defrosting, and to reduce the number of inputs of the defrosting heater 532 and to reduce the input required for cooling the interior after the internal temperature rise due to defrosting. Further energy saving can be performed.

When the ventilation resistance is reduced, the circulating air volume of the cool air blowing fan 516 is increased when the fan voltage is the same. FIG. 21 shows a characteristic image of ventilation resistance and air volume. As shown in FIG. 21, in the cooling performance of the refrigerator, the circulation air volume increases from Q1 to Q2 when the ventilation resistance is reduced from point 1 to point 2 P1 to P2 due to the characteristics of the fan.

Furthermore, when the performance can be secured with the same air volume, the same air volume can be obtained by reducing the number of fan rotations of the cool air blowing fan 516. In this case, the characteristic moves from the point 2 to the point 3, and the input is reduced by a decrease in the fan rotation speed, and energy saving as an electric input can be achieved. Furthermore, since the wind noise of the cool air blower fan 516 can be reduced by lowering the fan rotation speed, the noise is not a concern even in a quiet environment with low ambient noise such as at night.

In addition, in order to suppress the warm air inflow into the warehouse by the wind direction guide portion 522 and the defrost warm air guide member 541, it is also effective to prevent frost formation in the warehouse. If there is a large amount of warm air flowing into the cabinet, especially frost formation will occur on the part that is in communication with the cabinet and on the top surface of the cabinet. There is a possibility that the part may drip and fall into the case inside. If it is the shape of this Embodiment, since the suppression of warm air inflow into a store | warehouse | chamber can be aimed at, the reliability by frost formation can be prevented even at the time of use of the refrigerator for about ten years or more, and quality is high. A refrigerator can be provided.

By properly configuring the heat transfer suppression space 539, the defrost warm air guide member 541, and the wind direction guide portion 522, it is possible to exhibit a further energy saving effect by reducing the effect of internal heat during defrost and improving the defrost efficiency.

In addition, in this Embodiment, although the comprised heat-transfer suppression space inside was made into the air layer, for example, the heat insulation performance made into hard urethane foam with high heat insulation performance and low heat conductivity, foamed polystyrene (foamed polystyrene), and foamed polyethylene. By using the member 542, the effect of temperature can be further reduced, so that a further effect can be exhibited.

Further, the shortest distance between the end surface of the wind direction guide portion 522 on the side of the defrost heater 532 and the outer wall of the glass tube of the defrost heater 532 was set to 60 mm or more. Thereby, the temperature rise of cooler cover 520 itself which constitutes cool air return port 535 can be controlled by radiant heat from defrost heater 532 at the time of defrosting. For this reason, even if the defrosting time is excessively extended, such as during frosting, deformation due to temperature effects due to radiant heat does not occur. Moreover, since the shortest distance is set to 60 mm or more, the warm air from the defrost heater 532 at the time of defrosting flows to the cooler side and has an effect of making it easy to suppress the inflow into the refrigerator.

In this embodiment, since the type of refrigerant is isobutane, the temperature of the glass tube surface of the defrost heater 532 at the time of defrosting is regulated to 394 ° C. or less. In addition, the material of the cooler cover 520 and the wind direction guide portion 522 used in this embodiment is inexpensive PP (polypropylene), the heat-resistant melting temperature of PP is about 200 ° C., and the ignition temperature is about 440 ° C. ℃. However, considering the actual use, the heat-resistant temperature is set to 135 degrees Celsius. That is, considering the worst condition, the temperature at the surface of the glass tube of the defrost heater 532 is calculated to be 394 degrees Celsius, and the material is PP, and the heat resistance temperature is 135 degrees Celsius or less. The above calculation was derived using the Stefan-Boltzmann law (tenth embodiment).

FIG. 22 is a detailed cross-sectional view of the refrigerator compartment of the refrigerator according to the tenth embodiment of the present invention.

FIG. 23 is a rear view of the refrigerator cover of the refrigerator according to the tenth embodiment of the present invention. FIG. 24 is an explanatory diagram of a basic heat exchange unit of the refrigerator cooler according to the tenth embodiment of the present invention.

22 to 24, a cooler 607 provided on the back surface of the refrigerator main body for generating cold air and a defrost heater 632 including a glass tube heater provided below the cooler 607 are provided. Below the defrost heater 632, a drain pan 634 integrated with the lower surface of the lower freezing chamber 605 that receives the defrost water that falls after the frost attached to the cooler 607 is melted is provided. Further, a cooler cover 620 that covers the cooler 607 provided with a cool air return port 635 for returning the cool air that has cooled the lower freezing chamber 605 to the cooler 607 is disposed.

The cooler cover 620 includes a cooler front cover 637 inside the refrigerator and a cooler rear cover 638 on the cooler 607 side. The cooler front cover 637 and the cooler rear cover are located in front of the cooler 607. A heat transfer suppression space 639 configured by 638 is provided. The heat transfer suppression space 639 is configured from the upper end of the cool air return port 635 provided at the lower part of the cooler cover 620 to the lower end of the discharge port to the lower freezing chamber 605. If the height of the heat transfer suppression space 639 reaches the upper end of the cooler 607, there is an effect of suppressing heat transfer, but the position should be determined by the balance with the internal capacity and the case dimensions. In the present embodiment, considering the flow of warm air at the time of defrosting, it is generally from the lower side of the cooler 607 to the third stage, and to the lower end of the discharge port to the lower stage freezer compartment 605. The inside of the heat transfer suppression space 639 is an air layer.

Therefore, the frost adhering to the cooler 607 is melted by radiant heat from the defrost heater 632 at the time of defrosting and becomes high-humidity warm air and rises in the cooler chamber by natural convection. Although a part of the fluid flows into the storage, the heat transfer suppression space 639 can suppress the inflow into the storage and flow into the space. Especially in the case of Japan, it is a high humidity environment and frost is likely to adhere to the cooler 607, and the lower part of the cooler 607 where the return cold air from the freezer or refrigerator compartment is first exchanged with the cooler 607 for dehumidification This is where frost adheres most. Therefore, in the initial stage at the time of defrosting, the defrosted warm air is easy to flow around the cooler 607 and easily flows into the warehouse, but the heat transfer suppression space 639 suppresses the inflow into the warehouse. I can do it. Furthermore, since the heat transfer suppression space 639 can suppress the heat conduction to the interior of the cooler 607 due to the temperature rise around the cooler 607 due to the radiant heat from the defrost heater 632, the cooler in the interior is particularly cool. Since it is possible to reduce the temperature effect on the food in the back stored on the 607 side, the deterioration of the food is suppressed and long-term storage is possible.

In the present embodiment, a warm air recovery hole 646 is formed in the cooler rear cover 638 in order to make the inside of the heat transfer suppression space 639 communicate with the cooler chamber 623. Usually, the space entrance portions of the cooler front cover 637 and the cooler rear cover 638 constituting the heat transfer suppression space 639 are 3 mm or less in basic dimensions. When combined with the effect of the defrosting warm air guide member 641, it does not enter the heat transfer suppression space 639 by convection due to radiant heat from the defrosting heater 632 during defrosting, but when the parts are molded and variations in product dimensions or during product assembly. In some cases, warm air may enter the heat transfer suppression space 639 due to the fitting variation. However, when the warm air that has entered the heat transfer suppression space 639 by the warm air recovery hole 646 or the warm air that exists in the heat transfer suppression space 639 due to radiant heat from the defrost heater 632 expands to become more than the space volume, Warm air is discharged to the cooler chamber 623 side. This suppresses the inflow of warm air to the inside of the cabinet.

In addition, the position of the warm air recovery hole 646 is located so as to communicate with the outside of the projection surface from the front of the cooler basic heat exchanging portion 648 constituted by the fin and tube. As a result, since the cold air is out of the mainstream even during the cooling operation, the return cold air exchanges heat with the cooler 607 to become discharged cold air, and then returns to the cold air through the warm air recovery hole 646 to prevent short circuit. In addition, it is possible to prevent the heat exchange efficiency of the cooler 607 from being lowered.

Here, the area (Sk) of the warm air recovery hole 646 is smaller than the basic cross-sectional area (Sd) of the heat transfer suppression space 639. That is, the relationship is Sd> Sk. In the present embodiment, a plurality of warm air recovery holes 646 are arranged in the heat transfer suppression space 639 so that warm air staying in the heat transfer suppression space during defrosting can be discharged to the cooler chamber side without stagnation. I have to. In the present embodiment, the warm air recovery holes 646 are disposed at both end portions of the cooler 607. At this time, the area of the warm air recovery hole 646 is Sd> ΣSkn when expressed as Skn assuming n warm air recovery holes. In the warm air recovery from the warm air recovery hole 646 to the cooler chamber 623, the warm air that has flowed in due to the radiant heat from the defrost heater 632 during defrosting increases in pressure due to the temperature rise in the space, so Higher than pressure. For this reason, a part of the warm air in the heat transfer suppression space flows from the warm air recovery hole 646 to the cooler chamber side due to the pressure difference, and the warm air in the heat transfer suppression space does not flow out to the inside of the warehouse, thereby increasing the temperature in the warehouse. It is possible to provide a refrigerator that can be suppressed and has excellent energy saving performance. Furthermore, since temperature fluctuations due to inflow of warm air in the cabinet can be reduced, food deterioration such as frozen foods that are vulnerable to temperature fluctuations can be suppressed and long-term storage can be achieved.

As in the present embodiment, a plurality of warm air recovery holes 646 are provided and arranged so as to maintain pressure balance (for example, left and right equal), so that warm air can be efficiently recovered and stagnation can be reduced. The effect can be obtained even when the size of the cooler 607 is large particularly in a large refrigerator having a large capacity.

In addition, by disposing the heat transfer member 647 inside the heat transfer suppression space 639, it is possible to dehumidify the warm air staying inside the heat transfer suppression space. For 647, a metal material may be used. In this embodiment, an aluminum foil of t = 8 μm is pasted in consideration of cost, but an aluminum plate plate having a thickness larger than that of the aluminum foil or a material having higher thermal conductivity than aluminum (for example, copper) is used. When configured, the effect of heat transfer is further exhibited. Further, a heat storage material may be used for the heat transfer member 647. In that case, not only dehumidification, but the temperature in the heat transfer suppression space is less likely to rise even during defrosting due to the heat storage material cooled during the cooling operation, so the temperature rise into the warehouse can be significantly suppressed, It is possible to provide a refrigerator that suppresses deterioration of food, can be stored for a long period of time, and is excellent in energy saving.

In the present embodiment, the upper end of the warm air recovery hole 646 is inclined toward the heat transfer suppression space, and the lower end is inclined toward the cooler chamber. Thereby, the warm air staying in the heat transfer suppression space at the time of defrosting flows to the upper part by the updraft by natural convection, but the upper and lower ends of the warm air recovery hole 646 are inclined, so the air path resistance is reduced, It can be discharged to the cooler room side without stagnation. In addition, since the upper end and the lower end of the warm air recovery hole 646 are inclined, it is possible to improve the yield when molding the component parts, which leads to cost reduction by suppressing the mold cost.

The present invention relates to a refrigerator main body, a freezer compartment in a freezing temperature zone in the refrigerator, a cooler that is provided on the back side of the freezer compartment and that generates cold air, and a defrost heater and a defrost heater below the cooler There is a cooler chamber provided with a drain pan that receives the defrost water that falls when the frost attached to the cooler is melted. A cool air return port is provided for the cool air that has cooled the freezer compartment to return to the cooler, and a cooler cover that covers the cooler is provided. The center of the defrosting heater is positioned above the freezer compartment bottom surface in the horizontal direction, and a protruding member protruding inward of the refrigerator is disposed on the freezer compartment bottom surface so that the lower end of the cold air return port and the upper end of the protruding member overlap in the height direction. .

This makes it difficult to see red heat from the defrost heater at the time of defrosting, so even if the freezer compartment door is opened at the time of defrosting the refrigerator, there is no concern for the user due to the red heat of the defrost heater. .

Moreover, since the space between the lower end of the cold air return port and the protruding member is open, the return cold air from the interior to the cooler can ensure convection not only from the front of the return port but also from the lower side of the cooler, The heat exchange area in the cooler can be increased. In addition, the circulation air volume can be increased by lowering the return resistance of the return cold air, the heat exchange amount in the cooler is increased, the evaporation temperature is increased, and the energy can be saved by improving the efficiency of the refrigeration cycle.

Also, since the time for cooling the inside of the warehouse can be reduced by improving the heat exchange amount of the cooler and increasing the circulating air volume, the amount of frost formation on the cooler due to the shortening of the cooling operation time can also be reduced. As a result, the defrost cycle of the cooler can be extended, the number of inputs to the defrost heater can be reduced, and the input required for cooling the inside of the cabinet after the inside temperature has increased due to defrosting can be achieved, thereby further saving energy. it can.

Moreover, since the heat exchange area of the cooler can be increased by improving the air path is to increase the area to be frosted on the cooler, it is possible to suppress the deterioration of the cooling capacity at the time of frosting. This makes it possible to extend the time required to operate the refrigerator and require defrosting, to reduce the number of inputs of the defrost heater and to reduce the input required for cooling the interior after the temperature rise in the interior due to defrosting, Further energy saving can be performed.

In the present invention, the spatial distance between the protruding member and the lower end of the cold air return port is made larger than the height of the protruding member.

As a result, the opening area of the cool air returning from the inside of the refrigerator to the cooler can be increased, and the ventilation resistance can be further lowered. Therefore, the circulation air volume is increased in the case of the same fan voltage, and the heat exchange amount in the cooler is increased. Can save more energy.

In the present invention, the protruding member is disposed between the lower end of the cold air return port and the defrosting heater.

As a result, in addition to the energy saving effect due to the improvement of the air path and the improvement of the frost resistance, the red heat inside the warehouse is also invisible, and the protruding member is hidden at the lower end of the cool air return port of the cooler cover when viewed from the inside of the warehouse. Appearance is good and leads to improvement of appearance quality.

In the present invention, the protruding member is brought into contact with a part of the cooler cover constituting the lower end of the cold air return port.

This makes it possible to fix the outer periphery of the cool air return port, which is easily deformed when the cool air return port is largely opened, so that the size of the cool air return port is regulated, and the opening area can be secured and a sufficient cooling effect can be exhibited. In addition, since the operator works so that the projecting member contacts the projecting member at the time of attachment, the workability is improved and the working time can be shortened. Therefore, it is possible to improve the yield and suppress the product variation, and to secure a stable cooling performance.

In the present invention, the lower surface of the freezer is configured integrally with a drain pan.

This makes it possible to reduce the material cost and mold cost for creating the protruding member, and also reduce the man-hours in the manufacturing process. Also, since the management of the two parts of the protruding member and the drain pan is changed to the management of one part, the management cost can be reduced, the cost of the product can be reduced, the sales price can be lowered, and the sales rate can be improved. I can do it.

In the present invention, a plurality of wind direction guide portions are provided in the cool air return port, and each of the wind direction guide portions above the wind direction guide portion rather than on the line connecting the respective rear ends of the wind direction guide portions and the center of the defrosting heater. The rear end is at a high position.

∙ As a result, when viewed from the inside of the refrigerator, each wind direction guide part appears to overlap the defrost heater, so even if the freezer compartment door is opened during defrosting of the refrigerator, the red heat of the defrost heater is not visible. Moreover, there also exists an effect which suppresses the inflow of the radiant heat from a defrost heater at the time of defrosting, and suppresses the temperature rise in a store | warehouse | chamber. At this time, warm air due to radiant heat at the time of defrosting flows to the cooler side by each wind direction guide part, so that the defrosting efficiency can be improved and the energy saving effect by shortening the defrosting time can also be achieved.

In the present invention, a plurality of wind direction guide portions are provided in the cold air return port, and the plurality of wind direction guide portions are made longer than the upper wind direction guide portion on the defrosting heater side.

This not only improves the cooling capacity by reducing the ventilation resistance of the cold air return port, but also makes it easier to suppress the inflow of warm air into the cabinet due to radiant heat from the defrost heater during defrosting.

In the present invention, a plurality of wind direction guide portions are provided in the cold air return port, and a line connecting the inner end surfaces of the plurality of wind direction guide portions is substantially parallel to the rear surface of the case in the chamber.

This makes it possible to secure a certain distance or more between the case inside the cabinet and the cool air return port, and since there is no local narrowing, there is no decrease in the air volume due to an increase in the ventilation resistance of the air passage. Therefore, the cooling capacity is not reduced. In addition, since the circulation of cold air is not hindered, sublimation is easy because there is no stagnation even if the surface frosts due to the intrusion of high humidity outside air. In addition, due to the recent increase in actual internal volume, making the internal case as large as possible leads to improved sales, but the line connecting the draft angle when molding the internal case and the internal end surface of the wind direction guide is parallel. Therefore, it becomes the maximum actual internal volume with reduced invalid space.

In the present invention, the shortest distance between the cool air return port on the defrost heater side and the defrost heater outer shell is 60 mm or more.

As a result, the radiant heat from the defrost heater at the time of defrosting can suppress the temperature rise of the cooler cover itself that constitutes the cool air return port, so even if the defrosting time is excessively extended, such as during frost formation. Deformation or the like due to temperature effects due to radiant heat does not occur. Moreover, since the shortest distance is set to 60 mm or more, the warm air from the heater at the time of defrosting flows to the cooler side and has an effect of making it easy to suppress the inflow into the warehouse.

In the present invention, the protruding member is formed integrally with the cooler cover.

This makes it possible to reduce the material cost and mold cost for creating the protruding member, and also reduce the man-hours in the manufacturing process. In addition, the management cost can be reduced, the cost of the product can be reduced, the sales price can be lowered, and the sales rate can be improved.

In the present invention, the protruding member is configured integrally with the lower surface of the freezer compartment.

This makes it possible to reduce the material cost and mold cost for creating the protruding member, and also reduce the man-hours in the manufacturing process. In addition, the management cost can be reduced, the cost of the product can be reduced, the sales price can be lowered, and the sales rate can be improved.

The present invention provides a cooler that is provided on the back side of the refrigerator and generates cool air, a defrost heater provided below the cooler, and the cool air that covers the cooler and cools the freezer compartment returns to the cooler. A cooler cover having a cold air return port. The cooler cover is composed of the cooler front cover inside the cooler and the cooler side cooler rear cover, with a heat transfer suppression space in front of the cooler by the cooler front cover and cooler rear cover, and a cool air return port A defrosting warm air guide member is provided in

By providing a defrost warm air guide member at the cold air return port, convection due to radiant heat from the defrost heater during defrosting easily goes to the cooler, and the frost adhering to the cooler can be efficiently melted. The energization time of the frost heater can be reduced, and energy is saved by reducing the electric input. At this time, since the defrost time is shortened, the temperature rise is suppressed by shortening the non-cooling operation time, and the temperature increase is suppressed by the heat generated by the defrost heater itself. It is also possible to obtain an energy saving effect by reducing the operating speed of the compressor and shortening the operating time required for cooling the inside of the refrigerator.

Furthermore, the fact that the convection due to the radiant heat from the defrost heater at the time of defrosting easily flows to the cooler by the defrost warm air guide member also has the effect of suppressing the inflow of heat into the refrigerator, so the temperature rise in the refrigerator is reduced. There is also a function to suppress. Frozen food stored in the refrigerator deteriorates due to the effects of frost burning and heat fluctuation due to inflow of warm air during defrosting, but even when stored for a long time due to the effect of the defrosting warm air guide member Can be prevented.

In addition, the heat transfer suppression space composed of the cooler front cover and the cooler rear cover allows heat conduction to the interior even when the temperature around the cooler rises due to radiant heat from the defrost heater during defrosting. Therefore, it is possible to reduce the influence of the temperature on the food stored in the refrigerator, particularly on the cooler side, so that deterioration of the food can be suppressed and long-term storage can be achieved.

In addition, by providing a heat transfer suppression space, it is possible to reduce the temperature difference between the temperature of the cooler cover surface and the inside of the refrigerator by suppressing the thermal effect from the cooler that is low temperature, The adhesion of frost can be suppressed even by moisture inflow due to sublimation of moisture that has adhered to food when it is put into the refrigerator.

In the present invention, a heat insulating member is disposed inside the heat transfer suppression space.

This allows the temperature around the cooler to rise due to the radiant heat from the defrost heater during defrosting, but the heat conduction from the cooler around the temperature rise to the interior can be greatly suppressed. Therefore, since the temperature influence on the food stored in the refrigerator, particularly on the cooler side, can be eliminated, deterioration of the food can be suppressed, and further long-term storage can be achieved.

In addition, the ability to suppress heat conduction from the ambient temperature of the cooler to the interior during defrosting means that the radiant heat from the defrost heater is retained in the cooler chamber, and the temperature of the cooler itself. As the temperature rise is suppressed by shortening the defrosting time and shortening the non-cooling operation time, further energy saving can be realized.

In addition, in order to reduce the temperature effect from the cooler by arranging a heat insulating member inside the heat transfer suppression space, there are no places where the temperature is locally lowered in the warehouse, and when the door is opened and closed etc. The product quality can be improved because it is possible to prevent frost from adhering to the intruded moisture.

In the present invention, the upper end of the defrost warm air guide member is arranged at a position higher than the lower end of the cooler.

This makes it possible to increase the heat exchange area for the cooler of the return cold air, and to increase the circulating air volume by lowering the ventilation resistance of the return cold air, increasing the heat exchange amount in the cooler and increasing the evaporation temperature. Energy saving can be achieved by improving the refrigeration cycle efficiency.

Also, since the time for cooling the inside of the warehouse can be reduced by improving the heat exchange amount of the cooler and increasing the circulating air volume, the amount of frost formation on the cooler due to the shortening of the cooling operation time can also be reduced. As a result, the defrost cycle of the cooler can be extended, the number of inputs of the defrost heater can be reduced, the input required for cooling the inside after the temperature rise due to defrosting can be reduced, and further energy saving can be performed. it can.

Moreover, since the heat exchange area of the cooler can be increased by improving the air path is to increase the area to be frosted on the cooler, it is possible to suppress the deterioration of the cooling capacity at the time of frosting. This makes it possible to extend the time required to operate the refrigerator and require defrosting, to reduce the number of inputs of the defrost heater and to reduce the input required for cooling the interior after the temperature rise in the interior due to defrosting, Further energy saving can be performed.

In the present invention, the defrosting / warming guide member is formed integrally with the cooler front cover.

This can reduce the material cost and mold cost for creating the defrosting / warming guide member, and also reduce the man-hours in the manufacturing process. In addition, the management cost can be reduced, the cost of the product can be reduced, the sales price can be lowered, and the sales rate can be improved.

In the present invention, the defrosting / warming guide member is integrally formed with the cooler rear cover.

This can reduce the material cost and mold cost for creating the defrosting / warming guide member, and the man-hours in the manufacturing process. Moreover, since it becomes possible to simplify the shape including the draft angle of the mold by adopting the configuration of the cooler rear side cover, it leads to further reduction of the mold cost. In addition, since the management of the two parts of the defrosting / warming guide member and the rear cover of the cooler becomes one part management, the management cost can be reduced, the cost of the product can be reduced, and the sales price is lowered, which is also sold. The rate can be improved.

In the present invention, a wind direction guide portion is provided on the cooler return port cooler side, and the wind direction guide portion is inclined upward with respect to the inlet of the cold air return port.

∙ As a result, when viewed from the inside of the refrigerator, the airflow direction guide portions appear to overlap the defrost heater, so that the red heat of the defrost heater is not visible even when the freezer compartment door is opened during defrosting of the refrigerator. Moreover, there also exists an effect which suppresses the inflow of the radiant heat from a defrost heater at the time of defrosting, and suppresses the temperature rise in a store | warehouse | chamber. At this time, warm air by radiant heat at the time of defrosting flows to the cooler side by each wind direction guide part, so that the defrosting efficiency can be improved and the energy saving effect by shortening the defrosting time can also be achieved.

In addition, since the inclination of the airflow direction guide portion and the defrosting warm air guide member is upward, in addition to lowering the ventilation resistance of the intake air passage for the return cold air, the flow can be made uniform, further improving the cooling efficiency. You can also save energy.

In the present invention, the shortest distance between the defrosting heater side of the cooler cover and the defrosting heater outer shell is 60 mm or more.

As a result, the radiant heat from the defrost heater at the time of defrosting can suppress the temperature rise of the cooler cover itself that constitutes the cool air return port, so even if the defrosting time is excessively extended, such as during frost formation. Deformation or the like due to temperature effects due to radiant heat does not occur. Moreover, since the shortest distance is set to 60 mm or more, the warm air from the heater at the time of defrosting flows to the cooler side and has an effect of making it easy to suppress the inflow into the warehouse.

In the present invention, the center of the defrosting heater is located above the freezer compartment bottom basic surface.

As a result, the shape of the drain pan integrated with the freezer compartment bottom basic surface can be made substantially horizontal, and the ineffective space for installing the defrost heater can be reduced, so the internal volume is increased. I can plan. In addition, the fact that the depth of the drain pan can be reduced can reduce the cost of the mold when molding the constituent parts, which leads to cost reduction.

In the present invention, a metal heat transfer promoting member is provided on the cooler side of the cooler rear cover.

This allows the radiant heat of the defrost heater at the time of defrosting to be transmitted to the upper part of the cooler, thereby further shortening the defrosting time. Moreover, since the heat transfer promotion member is made of metal, the heat conductivity is high, and heat from the defrost heater can be transmitted uniformly. Therefore, since heat is uniformly transmitted to the cooler, not only is the defrosting efficiency improved, but there is no worry of frost remaining.

In the present invention, the wind direction guide portion and the defrosting / warming guide member are connected.

As a result, the wind direction guide portion configured in the upward direction in the same direction as the defrost warm air guide member integrally forms a coupled wind direction guide, so that convection due to radiant heat from the defrost heater at the time of defrost is further transferred to the cooler. Since it becomes easy to flow and the frost adhering to the cooler can be efficiently melted, the energization time of the defrost heater can be reduced, and the energy can be saved by reducing the electric input.

Also, the effect of suppressing the inflow of radiant heat from the defrost heater at the time of defrosting is increased, and there is a function to further suppress the temperature rise in the chamber.

The present invention is provided with a warm-air recovery hole that communicates the heat transfer suppression space and the cooler chamber that houses the cooler.

As a result, the space entrance portions of the cooler front cover and the cooler rear cover that constitute the heat transfer suppression space are 3 mm or less in basic dimensions. Although convection due to radiant heat from the frost heater does not enter the heat transfer suppression space, warm air may enter the heat transfer suppression space due to variations in the molding dimensions of the components themselves and fitting variations during product assembly. . At this time, when the warm air that has entered the heat transfer suppression space or the warm air that exists in the heat transfer suppression space is expanded by the radiant heat from the defrost heater and becomes more than the space volume, it is prevented from flowing into the inside of the warehouse. I can do it. Moreover, the excessive temperature rise in the space by radiant heat can also be suppressed. Therefore, since the temperature influence on the food stored in the refrigerator, particularly on the cooler side, can be eliminated, deterioration of the food can be suppressed, and further long-term storage can be achieved.

In the present invention, the warm air recovery hole is disposed outside the basic heat exchange part of the cooler.

As a result, during the cooling operation of the refrigerator, the cold air exchanged with the cooler enters the heat transfer suppression space through the warm air recovery hole, and prevents the short circuit from joining again with the return cold air from the inside of the refrigerator. Decrease in heat exchange efficiency of the vessel can be prevented.

In the present invention, the area of the warm air recovery hole is made smaller than the basic cross-sectional area of the heat transfer suppression space.

As a result, warm air that has entered the heat transfer suppression space due to convection due to radiant heat from the defrost heater during defrosting increases in pressure due to temperature rise in the space due to variations in the molding dimensions of the parts themselves and inconsistencies in assembly during product assembly. However, although it becomes higher than the pressure on the cooler chamber side having a large volume, part of the warm air in the heat transfer suppression space flows from the warm air recovery hole to the cooler chamber side due to the pressure difference. Therefore, since warm air in the heat transfer suppression space does not flow out to the inside of the warehouse, it is possible to suppress a temperature rise in the warehouse.

The present invention is provided with a plurality of warm air recovery holes.

As a result, warm air staying in the heat transfer suppression space at the time of defrosting flows from the plurality of warm air recovery holes to the cooler chamber side due to a pressure difference, and therefore the pressure in the heat transfer suppression space is particularly large even in a wide refrigerator. Can be kept in balance and stagnation can be reduced, and warm air inflow and temperature rise can be suppressed.

In the present invention, a heat transfer member is disposed inside the heat transfer suppression space.

As a result, even when high-humidity warm air stays in the heat transfer suppression space during defrosting, the heat transfer member cooled during the cooling operation enables dehumidification during defrosting, and through the warm air recovery hole, The inflow of warm air into the inside can be suppressed. Therefore, a partial frost residue or ice residue does not occur, and a refrigerator with high product reliability can be provided.

In the present invention, the upper end of the warm air recovery hole is inclined downward toward the heat transfer suppression space.

Thus, warm air staying in the heat transfer suppression space during defrosting is easily guided to the cooler chamber side by the guide shape inclined to the upper end side.

In the present invention, the lower end of the warm air recovery hole is inclined upward toward the cooler chamber side.

Thus, warm air staying in the heat transfer suppression space during defrosting is easily guided to the cooler chamber side by the inclined guide shape on the lower end side.

As described above, the present invention can be used for a space-saving large-capacity capacity associated with an increase in the storage capacity by reducing the ineffective volume, and a household refrigerator for the purpose of improving energy saving performance.

1,11,21,35 Cooler 2,15,22,32 Freezer room 3,23,33 Cooler room 4,12,24,31 Cooler cover 5,25,41 Inner box 6,26 Cold air return port 7 , 27 Defrost heater 8 Vegetable room 9 Partition part 10 Guide part 13, 37 Defrost heater 14, 36 Cover heater 28 Warm air inflow space 34 Fan 38 Water receiving part 39 Cooler room inlet 40 Toy 42 Guide 101, 301, 501 Refrigerator Main body 102, 302, 502 Refrigeration room 102a, 302a, 502a Refrigeration room door 103, 303, 503 Upper stage freezing room 103a, 303a, 503a Upper stage freezing room door 104, 304, 504 Ice making room 104a, 304a, 504a Ice making room door 105, 305, 355, 405, 455, 505, 605 Lower freezer compartment 105a, 305a, 505a Lower Freezer room door 106,306,506 Vegetable room 106a, 306a, 506a Vegetable room door 107,307,407,507 Cooler 108,308,508 First top surface 109,309,509 Second top surface 110,310 , 510 First heat insulating partition 111, 311, 511 Second heat insulating partition 112, 312, 512 Third heat insulating partition 113, 163, 213, 263, 313, 363, 513 Fourth heat insulating partition 116 , 316, 516 Cold air fan 117, 317, 517 Compressor 118, 318, 518 Capillary tube 119, 319, 519 Machine room 120, 170, 270, 320, 470, 520 Cooler cover 122, 222, 272, 322 372, 422, 472, 522 Wind direction guide part 123, 3 3,523,623 Cooler chamber 124,324,524 Outer box 125,325,525 Inner box 126,326,526 Heat insulation body 132,182,232,282,332,382,432,482,532,632 Defrosting Heater 133,283,333,433,533 Cover heater 134,184,234,284,334,384,484,434,534,634 Drain pan 135,185,235,285,335,385,435,485,535, 635 Cold return port 136,186,236,286,336,536 Protrusion member 155,205,255 Freezer compartment 157,257,207,357,457,607 Cooler 220,370,420,620 Cooler cover 337,487 , 537, 637 Cooler front cover 33 , 488, 538, 638 Cooler rear side cover 339, 539, 639 Heat transfer suppression space 340, 540 Heat transfer promoting member 343, 543 Defrosting warm air guide upper end 344, 544 Cooler lower end 341, 391, 441, 491 541,641 Defrost warm air guide member 495 Connection wind direction guide 530 Drain pan inner end surface 531 Defrost warm air guide member lower end 646 Warm air recovery hole 647 Heat transfer member 648 Cooler basic heat exchange section

Claims (28)

A refrigerator main body, a freezer compartment in a freezing temperature zone in the refrigerator, a cooler that is provided on the back side of the freezer compartment and generates cold air, a defrost heater and a defrost heater provided below the cooler A cooler chamber provided with a drain pan that receives defrost water that falls below the frost that has adhered to the cooler and falls, and the cool air that covers the cooler and cools the freezer chamber to the cooler A cooler cover having a cool air return port for returning, and the center of the defrost heater is above the lower surface of the freezer compartment in the horizontal direction, and protrudes to the inside of the refrigerator on the lower surface of the freezer compartment A refrigerator, wherein a protrusion member is disposed, and a lower end of the cold air return port and an upper end of the protrusion member are overlapped in a height direction. The refrigerator according to claim 1, wherein a spatial distance between the protruding member and the lower end of the cold air return port is made larger than a height of the protruding member. The refrigerator according to claim 1, wherein the protruding member is disposed between the lower end of the cold air return port and the defrost heater. The refrigerator according to claim 1, wherein the protruding member is brought into contact with a part of the cooler cover that forms the lower end of the cold air return port. The refrigerator according to claim 1, wherein the lower surface of the freezer compartment is configured integrally with a drain pan. A plurality of wind direction guide portions are provided in the cold air return port, and each wind direction guide portion is located above the wind direction guide portion rather than on a line connecting the back end of each of the wind direction guide portions and the center of the defrosting heater. The refrigerator according to claim 1, wherein the back end of the refrigerator is at a high position. The plurality of wind direction guide portions are provided in the cold air return port, and the plurality of wind direction guide portions have a lower wind direction guide portion that is longer than an upper wind direction guide portion on the defrost heater side. Or the refrigerator as described in any one of 2. 3. A plurality of wind direction guide portions are provided in the cold air return port, and a line connecting inner end surfaces of the plurality of wind direction guide portions is parallel to the rear surface of the case in the store. The refrigerator as described in any one of. The refrigerator according to any one of claims 1 and 2, wherein a shortest distance between the cold air return port on the defrost heater side and the outline of the defrost heater is 60 mm or more. The refrigerator according to claim 1, wherein the protruding member is configured integrally with the cooler cover. The refrigerator according to claim 1, wherein the protruding member is formed integrally with the lower surface of the freezer compartment. A refrigerator main body, a freezer compartment in a freezing temperature zone in the refrigerator, a cooler that is provided on the back side of the freezer compartment to generate cold air, a defrost heater disposed below the cooler, and the cooler A cooler cover that covers and has a cool air return port through which the cool air that has cooled the freezer compartment returns to the cooler, the cooler cover comprising a cooler front cover and a cooler inside the refrigerator The cooler front cover is provided with a heat transfer suppression space by the cooler front cover and the cooler rear cover in front of the cooler, and a defrost warm air guide member is provided at the cool air return port. A refrigerator characterized by that. The refrigerator according to claim 12, wherein a heat insulating member is disposed inside the heat transfer suppression space. 14. The refrigerator according to claim 12, wherein an upper end of the defrosting / warming guide member is higher than a lower end of the cooler. The refrigerator according to any one of claims 12 and 13, wherein the defrosting warm air guide member is configured integrally with the cooler front cover. The refrigerator according to any one of claims 12 and 13, wherein the defrosting / warming guide member is configured integrally with the cooler rear cover. The cold air return port is provided with a wind direction guide portion on a cooler side, and the wind direction guide portion is inclined upward with respect to an inlet of the return port. The refrigerator described. The refrigerator according to any one of claims 12 and 13, wherein the shortest distance between the defrost heater side of the cooler cover and the outer shell of the defrost heater is 60 mm or more. The refrigerator according to any one of claims 12 and 13, wherein the center of the defrost heater is located above the basic surface of the freezer compartment bottom. The refrigerator according to any one of claims 12 and 13, further comprising a metal heat transfer promoting member on the cooler side of the cooler rear cover. The refrigerator according to claim 17, wherein the wind direction guide portion and the defrosting / warming guide member are connected to each other. The refrigerator according to claim 12, further comprising a warm air recovery hole that communicates the heat transfer suppression space with a cooler chamber that houses the cooler. The refrigerator according to claim 22, wherein the warm air recovery hole is disposed outside a basic heat exchange part of the cooler. 24. The refrigerator according to claim 22, wherein an area of the warm air recovery hole is smaller than a basic cross-sectional area of the heat transfer suppression space. The refrigerator according to any one of claims 22 and 23, wherein a plurality of the warm-air recovery holes are provided. The refrigerator according to any one of claims 22 and 23, wherein a heat transfer member is disposed inside the heat transfer suppression space. The refrigerator according to any one of claims 22 and 23, wherein an upper end of the warm air recovery hole is inclined downward toward the heat transfer suppression space. The refrigerator according to any one of claims 22 and 23, wherein a lower end of the warm air recovery hole is inclined upward toward the cooler chamber.

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