JP2010071608A - Low-temperature showcase - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-temperature showcase capable of solving the problem of dripping of the water into a display chamber caused by melting of frost from a wind direction plate disposed at a cold air discharge port. <P>SOLUTION: In this low-temperature showcase 1, cold air exchanging heat with a cooler 22 is discharged into the display chamber 20 from the cold air discharge port 27, the wind direction plate 26 is disposed at the cold air discharge port 27, and a water absorbing member 51 is disposed on a lower face or a lower end section of the wind direction plate 26, thus the problem that the water droplets attached to the wind direction plate 26 drip into the display chamber can be prevented. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a low-temperature showcase in which cold air heat-exchanged with a cooler is discharged into a display chamber from a cold air discharge port, and particularly relates to a wind direction plate provided at the cold air discharge port.

  Conventionally, this type of low-temperature showcase is equipped with a cooler and a blower inside the heat insulation box, and the air in the display room is sucked from the suction port by the operation of the blower to exchange heat with the cooler. It is configured to cool by discharging from the outlet into the display chamber.

  For example, there is a flat type low-temperature showcase having an opening formed on the upper surface as disclosed in Patent Document 1. In such a low-temperature showcase, as shown in FIG. 5, a cold air discharge port 102 is formed in the upper part of the rear wall of the main body 100 constituted by the heat insulating box body and is located above the rear portion of the display chamber 101 to blow out cold air. Has been. The cool air discharge port 102 discharges cool air rising from the duct 103 formed in communication with the lower part of the heat insulating box toward the lower front part of the display chamber 101. Is provided.

  However, in the refrigeration showcase in which the display room has a freezing temperature, there is a problem that frost is formed in the cooler due to moisture entering from the outside and the cooler is blocked. In particular, in a showcase having a large opening, such frost formation becomes prominent when outside air containing a large amount of moisture flows into the display chamber.

Therefore, in the conventional low temperature showcase, when the cooling operation is executed for a predetermined time, the defrosting operation of the cooler is executed. In this defrosting operation, the compressor of the cooling device is stopped to stop the flow of the refrigerant, the cooling action of the cooler is stopped, and the cooling air circulation fan is continuously operated. And by supplying with electricity to a defrost heater, a cooler is heated and frost formation is thawed.
Japanese Patent Laid-Open No. 9-210533

  However, in the low-temperature showcase as described above, frost also adheres to each wind direction plate of the cool air discharge port provided near the upper surface opening due to intrusion of the outside air or the like. In the refrigerated showcase, the wind direction plate is likely to be frosted because it has a low temperature of −28 ° C., for example. In particular, in the conventional low-temperature showcase as described above, the wind direction plate provided at the cold air discharge port is configured to extend to the upper side of the display chamber. Frost adheres to the lower end of the wind direction plate located above the display chamber.

  The frost adhering to the wind direction plate is melted by the warm air rising in the duct by performing the defrosting operation of the cooler as described above. When the defrosting operation of the cooler is executed, the wind direction plate that was about −28 ° C. during the cooling operation rises to about + 20 ° C. immediately before the end of the defrosting operation. At this time, since the wind direction plate is provided toward the lower front part of the display chamber, the frost is melted to form a water droplet W and is dropped into the display chamber by its own weight.

  Since merchandise is usually displayed in the display room, there is a problem that the merchandise gets wet when the defrosting operation is performed.

  The present invention has been made in order to solve the conventional technical problem, and solves the problem that water generated by melting frost from the wind direction plate provided in the cool air discharge port is dropped into the display chamber. Provide a low-temperature showcase that can

  The low-temperature showcase of the present invention is formed by discharging cold air heat-exchanged with a cooler into a display chamber from a cold air discharge port, and includes a wind direction plate provided at the cold air discharge port, the lower surface of the wind direction plate, Alternatively, a water absorbing member is provided at the lower end.

  A low-temperature showcase according to a second aspect of the present invention is one in which cold air heat-exchanged with a cooler is discharged into a display chamber from a cold air discharge port, and includes a wind direction plate provided at the cold air discharge port. Is made of a water-absorbing material.

  According to the present invention, in a low temperature showcase in which cool air exchanged with a cooler is discharged into the display chamber from the cool air discharge port, the wind direction plate provided in the cool air discharge port is provided, or the lower surface of the wind direction plate, or Since a water absorbing member is provided at the lower end, it adheres to the wind direction plate due to contact with frost adhering to the wind direction plate due to moisture contained in the outside air or air containing a lot of moisture due to defrosting operation of the cooler, etc. Even if the frost is melted by some cause, for example, warm air in the defrosting operation to form water droplets, it can be absorbed and held by the water absorbing member provided on the lower surface or the lower end of the wind direction plate.

  For this reason, it is possible to remarkably suppress the inconvenience that such water drops fall on the goods displayed in the display room and become contaminated. Further, the water droplets that are absorbed and held by the water absorbing member can be sublimated by the low-temperature cold air discharged from the cold air discharge port.

  According to the second aspect of the present invention, in the low temperature showcase in which the cool air exchanged with the cooler is discharged into the display chamber from the cool air discharge port, the wind direction plate provided at the cool air discharge port is provided, and the wind direction plate is absorbed by water. Because it is made of a material, frost attached to the wind direction plate due to moisture contained in the outside air, or frost attached to the wind direction plate due to contact with air containing a lot of moisture due to defrosting operation of the cooler, etc. Even if it is melted by the cause, for example, warm air in the defrosting operation to form water droplets, it can be absorbed and held by the wind direction plate made of the water-absorbing material.

  Therefore, it is possible to suppress the inconvenience that such water drops fall on the goods displayed in the display room and are contaminated. Further, the water droplets that are absorbed and held by the water absorbing member can be sublimated by the low-temperature cold air discharged from the cold air discharge port.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a longitudinal side view of a low-temperature showcase 1 to which the present invention is applied, FIG. 2 is an enlarged sectional view of an upper part of a rear wall 2B of the low-temperature showcase 1, and FIG. 3 is a rear perspective view of the upper part of the rear wall 2B. . The low-temperature showcase 1 in the present embodiment is used for displaying and storing frozen foods, frozen desserts and the like in, for example, supermarkets, and the like. The main body is composed of side plates 8 and 8 constituting both side surfaces of the heat insulating box 2. The heat insulation box 2 includes a metal outer box 3, a metal inner box 4 incorporated in the outer box 3 with a space therebetween, and a resin breaker that connects the upper ends of both boxes 3 and 4. 5 and a heat insulating material 7 such as foamed polyurethane filled between the boxes 3 and 4 and the breaker 5 by an in-situ foaming method. The side plate 8 is also made of a material having heat insulation properties.

  In the present embodiment, the heat insulating box 2 has the front wall 2A formed lower than the rear wall 2B, and the upper surface of the front wall 2A has a transparent wall 9 formed of three glass plates on the rear. The wall 2B is erected so as to extend to substantially the same height as the top surface of the wall 2B. And the handrail 10 is provided in the upper end of this transparent wall 9 over left and right.

  Duct plates 16 and 17 are attached to the inner sides of the front and rear surfaces of the inner box 4 with a space therebetween, and the upper end of the rear duct plate 17 is bent inward. The duct plate 16 on the front surface is formed to the same height as the front wall 2A of the heat insulation box 2, and a transparent wall 18 made of a glass plate is erected at the upper end of the duct plate 16. . The transparent wall 18 is formed up to a height substantially the same as the duct plate 17 on the rear surface.

  A bottom plate 19 is detachably mounted between the lower ends of the duct plates 16 and 17, and thereby, a series of ducts 21 rising from the bottom to the front and rear are formed inside the inner box 4. 17 and the inside of the bottom plate 19, a display chamber 20 is defined. On the other hand, a drain pan (not shown) is provided on the upper surface of the bottom wall 2D of the heat insulation box 2, and a drain hole (not shown) communicating with the lower outside of the heat insulation box 2 is formed at the lowest position of the drain pan. . On the drain pan, a horizontal cooler 22 is disposed in the duct 21, and a fan 24 composed of a suction type propeller fan is placed in a fan case 23 provided on the front side of the cooler 22. It is attached. The blower 24 and the fan case 23 are provided with a blower heating heater 50 and the like, which will be described in detail later. In the figure, reference numeral 25 denotes a defrost heater (cooler heating heater) provided in the cooler 22. A defrost heater 36 that generates heat in conjunction with the defrost heater 25 is also provided at the lower end of the fan case 23.

  2 and 3, the upper end of the duct plate 17 is a cold air discharge port 27, and the upper end of the duct plate 16 is a cold air suction port 28. Wind direction plates 26 (three in this embodiment) are attached at a predetermined interval.

  In the present embodiment, each wind direction plate 26 is provided with its rear portion hanging down in the duct 21, and the front portion is bent inward along the upper end portion of the duct plate 16 or at a predetermined angle. It is formed by bending. The front end portion is configured to extend up to the upper rear portion of the display chamber 20 by a predetermined dimension. In addition, the front end portion is formed to be slightly low from the rear to the front. In the present embodiment, the upper end portion of the duct plate 17 is formed forward so as to form a predetermined cool air passage between the upper end portion of the duct plate 17 and the wind direction plate 26 disposed on the lowermost side. It is assumed that the upper flange 17A is bent at a substantially right angle toward the upper flange 17A.

  A water absorbing member (evaporating plate) 51 having a predetermined area is attached to the lower surface of the front end portion of each wind direction plate 26 by, for example, silicon bonding. In the present embodiment, Universex (trade name) is used as an example of the water absorbing member 51. This is formed by using a non-woven fabric such as polyester fiber as a base material, heat-curing fine phenol on the base material to form a fixing agent, further imparting hydrophilicity and immersing in an alcohol-based solvent, followed by drying. Is.

  On the other hand, the rear wall 2B of the heat insulating box 2 has an upper wall 2C that extends forward by a predetermined dimension on the upper surface, and a top table 12 is provided on the upper surface of the upper wall 2C. . The top table 12 houses a night cover 11 that can be pulled out from the front end of the upper wall 2C to the front wall 2A. The night cover 11 is a cover member for preventing cold air in the display room 20 from leaking outside during non-business hours such as at night. In the figure, reference numeral 13 denotes a night cover holding member for holding the handle portion 11 </ b> A provided at the front end of the night cover 11. Furthermore, a fluorescent lamp 15 is attached to the front portion of the top table 12 from the left and right.

  On the other hand, kick plates 30 and 30 having a large number of through holes (not shown) are attached around the lower end of the heat insulation box 2, and are positioned between the kick plates 30 and 30 and below the heat insulation box 2. A machine room 31 is configured. In the machine room 31, a compressor 32, a condenser 33, a condenser blower 34, an electric box (not shown), and the like constituting a known refrigeration cycle together with the cooler 22 are disposed. Further, the front surface of the machine room 31 is closed by a panel 35 so as to be opened and closed, and a plurality of slits (not shown) are formed in the panel 35.

  The compressor 32, the blower 23, the condenser blower 34, the blower heating heater 50, the defrost heaters 25, 36, and the like as described above are connected to a control device (not shown) constituted by a general-purpose microcomputer.

  With the above configuration, when the compressor 32 and the fans 24 and 34 are operated by the control device, the cool air cooled by the cooler 22 is blown upward in the duct 21 and the cool air discharge at the upper end of the duct plate 17 is performed. It is discharged from the outlet 27 toward the front upper part or the front lower part of the display chamber 20. The cool air circulated in the display chamber 20 descends between the transparent walls 9 and 16, is sucked into the duct 21 from the cool air suction port 28 at the upper end of the duct plate 16, and circulates back to the blower 24. Thereby, the inside of the display chamber 20 is cooled to a predetermined freezing temperature such as −20 ° C., for example. Therefore, each wind direction plate 26 is, for example, −28 ° C. by the low-temperature cold air discharged from the cold air discharge port 27 (−30 ° C. to −35 ° C. in the freezer showcase, −5 ° C. to −10 ° C. in the refrigerated showcase). It has been cooled to a degree (in the case of a frozen showcase). During the cooling operation, the defrost heaters 25 and 36 and the blower heating heater 50 as heaters for heating the cooler are not energized.

  Here, the display chamber 20 in the present embodiment is formed so as to be largely open upward, so that outside air easily enters the display chamber 20. Since the outside air contains a lot of moisture, frost is generated on the surface of the wind direction plate 26 cooled to a lower temperature. In addition, the frost is not limited to this, and during the defrosting operation described later, the ice adhering to the blower 24 to be melted is melted and the air containing a lot of moisture generated thereby is ducted. It is also generated by moving up in 21.

  When the integrated operation time of the cooling operation is executed for 12 hours, for example, frost grows on the cooler 22, and thus the cooler defrosting operation is started by control of a timer or the like. In this embodiment, the cooling operation is performed when the integrated operation time reaches 12 hours. In addition, since it is preferable to perform this cooler defrosting operation outside business hours, the user can arbitrarily set the time.

  This cooler defrosting operation includes a cooler heating operation and a draining operation. During the cooler defrosting operation, the compressor 32 is stopped, the refrigerant flow is stopped, the cooling action of the cooler 22 is stopped, and the blower 24 is continuously operated. In the first cooler heating operation, the defrost heaters 25 and 36 are operated to generate heat. The air heated by the defrost heaters 25, 36, that is, warm air is circulated from the front to the cooler 22 by the blower 24, and the cooler 22 is heated by this to melt frost. The melted frost flows on the bottom wall 2D and is discharged to the outside through the drain hole.

  When this defrosting progresses and the temperature of the cooler 22 reaches a predetermined defrosting end temperature, the operation of the defrost heaters 25 and 36 is stopped, the cooler heating operation is terminated, and then the draining operation is performed. enter. Both the supply of the refrigerant to the cooler 22 and the heat generation of the defrost heaters 25 and 36 are stopped to promote melting and outflow of the ice block on the bottom wall 2D. After the draining operation, the cooling operation is started again.

  At this time, the frost adhering to the surface of the wind direction plate 26 by the cooling operation as described above is melted by the warm air rising in the duct 21 by the cooler defrosting operation. Immediately before the end of the cooler defrosting operation, the wind direction plate 26 is heated to about + 20 ° C., so that the attached frost becomes water.

  However, in the present embodiment, since the water absorbing member 51 is provided on the lower surface of the front end portion of the wind direction plate 26, most of the melted water is absorbed by the water absorbing member 51 without forming water droplets. Retained. Further, even when water droplets are formed, the water absorbing member 51 immediately absorbs and holds the water.

  Therefore, it is possible to avoid the inconvenience of water droplets adhering to the lower surface of the front end portion of the wind direction plate 26 as in the prior art, so that the water droplets adhering to the wind direction plate fall on the product displayed in the display chamber 20. It is possible to remarkably suppress the disadvantage of contamination.

  In particular, conventionally, after the cooler defrosting operation is finished, when the cooling operation is started and the compressor 32 is operated, water droplets attached to the wind direction plate 26 fall into the display chamber 20 due to the impact. , Which was a cause of product contamination. However, as described above, since the water droplets adhering to the wind direction plate 26 are effectively absorbed and held by the water absorbing member 51, they drop into the display chamber 20 due to an impact when the compressor 32 is operated. It is possible to eliminate the inconvenience.

  Further, the water absorbed and retained by the water absorbing member 51 is cooled to a low temperature of about −28 ° C. as described above by performing a cooling operation thereafter. Is sublimated by the low-temperature cold air discharged from the cold-air discharge port 27.

  In the above-described embodiment, the flat type low temperature showcase 1 having an opening on the upper side is described as an example. However, the present invention is not limited to this, and for example, a vertical type having an opening on the front surface. You may apply to the wind direction board provided in the cool air discharge port of the low temperature showcase of a type | mold. In this case, since the wind direction plate is formed by bending the front end downward, a similar effect can be obtained by providing a water absorbing member having a predetermined area at the lower end portion of the wind direction plate. .

  Further, in the above embodiment, the rear portion of the cold air discharge port 27 hangs down in the duct 21, and the front portion is bent inward along the upper end portion of the duct plate 16 or at a predetermined angle. Although a plurality of wind direction plates 26 formed by bending are provided, the present invention is not limited to this, and a configuration as shown in FIG.

  That is, as shown in a partially exploded partial perspective view of the low-temperature showcase 1 in FIG. 4, a plurality of water absorbing members (evaporation) are provided in order to ensure the flow of cold air to the cold air discharge port 27 and to regulate the discharge direction of the cold air. A wind direction plate 52 constituted by providing a plate 53 in a substantially lattice shape may be attached.

  As a result, frost attached to the wind direction plate 52 due to moisture contained in the outside air or frost attached to the wind direction plate 52 due to contact with air containing a lot of moisture due to defrosting operation of the cooler 22 is caused by some cause. For example, even if it is melted by warm air in the defrosting operation to form water droplets, it can be absorbed and held by the wind direction plate 52 formed of the water absorbent material 53.

  For this reason, it is possible to suppress the inconvenience that such water drops fall on the products displayed in the display chamber 20 and are contaminated. Further, the water droplets absorbed and retained by the water absorbing member 53 can be sublimated by the low temperature cold air discharged from the cold air discharge port 27.

  In the present embodiment, an open showcase in which outside air containing a lot of moisture easily enters the display chamber 20 is described as an example, but the present invention is not limited to this. In addition, although a refrigerated showcase in which frost is likely to be attached to the cold air outlet 27 is given as an example, the present invention is not limited to this, and the same effect can be obtained even in a refrigerated showcase.

It is a vertical side view of the low-temperature showcase to which this invention is applied. It is an expanded sectional view of the rear wall upper part of a low-temperature showcase. It is a back perspective view of the rear wall upper part of a low-temperature showcase. It is a partially exploded partial perspective view of a low-temperature showcase as another embodiment. It is an expanded sectional view of the rear wall upper part of the conventional low-temperature showcase.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Low temperature showcase 2 Heat insulation box 2A Front wall 2B Rear wall 2C Top wall 2D Bottom wall 8 Side plate 10 Hand rail 11 Night cover 16, 17 Duct plate 18 Transparent wall 19 Bottom plate 20 Display room 21 Duct 22 Cooler 23 Fan case 24 Blower 25, 36 Defrost heater (heater for cooling device)
26, 53 Wind direction plate 27 Cold air outlet 28 Cold air inlet 32 Compressor 50 Blower heater 51, 53 Water absorbing member

Claims (2)

In a low-temperature showcase in which cool air exchanged with a cooler is discharged from the cool air outlet into the display room,
A low-temperature showcase comprising a wind direction plate provided at the cold air discharge port, and a water absorbing member provided at a lower surface or a lower end portion of the wind direction plate. In a low-temperature showcase in which cool air exchanged with a cooler is discharged from the cool air outlet into the display room,
A low temperature showcase comprising a wind direction plate provided at the cold air discharge port, wherein the wind direction plate is made of a water absorbing material.

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