JP2003014368A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator high in heat insulation performance by effectively disposing the vacuum heat insulation material, at a part where the surface temperature of an outer casing 1 of a heat insulation case body is higher than an outside air temperature, and a part where other inclusion than the heat insulation material is present at the inside of the outer casing 1 in case many vacuum heat insulation materials are used. SOLUTION: Concerning a part where the surface temperature of the outer casing 1 of a heat insulation casing is higher than the temperature of outside air and a part where an inclusion is located inside the outer casing 1, by embedding a vacuum heat insulation material 3a in rigid urethane foam 4, shortage in filling of the rigid urethane foam 4 in case the vacuum heat insulation material 3a is formed into a double layer is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator using a vacuum heat insulating material.

[0002]

2. Description of the Related Art In recent years, for the purpose of energy saving and space saving of refrigerators, there is a method of using a vacuum heat insulating material having high heat insulating performance as one means for improving the heat insulating performance of the refrigerator, and the demand for energy saving increases more and more. Nowadays, it is an urgent task to improve the heat insulation performance by maximizing the use of a vacuum heat insulation material having a heat insulation performance of several times to ten times that of rigid urethane foam within an appropriate range. I can say. As means for realizing a refrigerator having high heat insulation performance using a vacuum heat insulating material, there is disclosed in Japanese Patent Laid-Open No. 6-1599.
No. 22, JP-A-3-233285, and JP-A-1
Means and the like described in JP-A-20205989 are known.

FIG. 5 shows a side sectional view of a refrigerator described in Japanese Patent Laid-Open No. 6-159922. In this example, the entire space formed by the outer box 1 and the inner box 2 is covered with a moldable bag-shaped paper material 8, and the inside of the paper material 8 is filled with a filler 9 made of an inorganic porous material. The vacuum heat insulating material 3 is configured along the shape of the space surrounded by the box. With this configuration, it is possible to easily store the vacuum insulation material between the inner and outer boxes and to eliminate the work of closing the gap between the inner and outer boxes and the vacuum insulation material, and use only the vacuum insulation material without using rigid urethane foam. Since a heat insulating box can be configured, extremely high heat insulating performance can be secured.

Further, FIG. 6 shows Japanese Patent Laid-Open No. 10-205989.
Fig. 2 shows a horizontal sectional view of the refrigerator described in the publication. In this example, the vacuum heat insulating material 3 is disposed in contact with the outer box in the space formed by the outer box 1 and the inner box 2,
After arranging, the hard urethane foam 4 is filled and foamed. With this configuration, since the vacuum heat insulating material is attached to the outer box having a smooth surface, the attaching work is easy even when the area of the vacuum heat insulating material is large. In addition, since the rigid urethane foam and the vacuum heat insulating material are laminated, there is no fear that the heat insulating box will be extremely weak in strength, and the strength can be increased by adding a reinforcing material.

FIG. 7 shows an enlarged sectional view of a heat insulating wall of a refrigerator described in Japanese Patent Laid-Open No. 3-233285. In this example, in the space formed by the outer box 1 and the inner box 2, the vacuum heat insulating material 3 is inserted and held by the holding plate 6 supported by the fixture 5 attached to the inner box 2, and the remaining space is hardened. It is filled with urethane foam to form a heat insulating box. With this configuration, not only can the high temperature refrigerant piping for heat dissipation, the handle of the door, etc., be disposed without problems on the outer box side in the space formed by the inner and outer boxes, but also when filling the rigid urethane foam. Since the vacuum insulation does not move,
It is possible to prevent deterioration of the filling state of the rigid urethane foam due to the movement of the vacuum heat insulating material. Further, since the rigid urethane foam and the vacuum heat insulating material are laminated, there is no fear that the heat insulating box body will be significantly weakened in terms of strength.

[0006]

However, among the conventional examples, the refrigerator disclosed in Japanese Patent Laid-Open No. 6-159922 is a refrigerator that uses only a vacuum heat insulating material, which is inferior in strength to rigid urethane foam. Therefore, there is a problem that the heat insulation performance is high, but the strength is very weak.

Further, in the refrigerator described in Japanese Patent Laid-Open No. 10-205989, when the coverage of the vacuum heat insulating material with respect to the outer area of the outer box becomes large, for example, a high temperature refrigerant for heat radiation, which is one of the components of the refrigerator, is used. Such as piping and door handles
There is a problem that a space for arranging a member to be arranged on the outer box side cannot be secured in a space formed by the inner and outer boxes. In addition, since the vacuum heat insulating material is attached directly to the outer box, when the refrigerator is installed in the system kitchen or furniture is placed on the left and right of the refrigerator, the When the outside air temperature around the refrigerator exceeds 40 ° C due to heat radiation, the vacuum insulation performance is significantly deteriorated over time, and the effect of reducing the heat absorption load is significantly reduced. There was a problem that the refrigerator could not cool down.
Further, since the vacuum heat insulating material is directly adhered to the outer box, there is a problem that the outer box surface is uneven and corrugated, which tends to impair the appearance.

Further, in the refrigerator described in Japanese Patent Laid-Open No. 3-233285, a rigid urethane foam that foams on both the outside and inside of the vacuum heat insulating material because the peripheral portion of the vacuum heat insulating material is supported by the sandwiching plate. The vacuum heat insulating material may warp because it cannot withstand the foaming pressure difference. As a result, the gap between the outer box or inner box and the vacuum heat insulating material becomes extremely thin locally, and the problem that the rigid urethane foam is not molded occurs, and sometimes the void caused by this problem causes unevenness on the outer box surface. There was a problem that waviness occurred and the appearance was impaired. Further, in order to prevent warpage, it is necessary to divide the vacuum heat insulating material into small pieces and support them with a sandwiching plate, but in this case, the coverage of the vacuum heat insulating material on the outer box surface cannot be increased. Furthermore, in order to attach the fixture to a thin inner box of 1 mm or less made of ABS,
There is also a problem that the fixing work of the fixture is not stable.

In view of the above-mentioned problems, the present invention provides a refrigerator having no problem in box strength even if a large amount of vacuum heat insulating material is used, and ensuring high heat insulating performance.

[0010]

In order to solve this problem, the present invention has the following constitution.

A refrigerator according to claim 1 of the present invention comprises a rigid urethane foam and a vacuum heat insulating material between an outer box and an inner box, and the vacuum heat insulating material is provided on both sides, top, back, bottom and front. In a refrigerator in which the coverage rate of the vacuum heat insulating material is more than 50% and less than 80% with respect to the surface area of the outer box, the vacuum heat insulating material is provided on the surface where the outer box surface temperature is higher than the outside air temperature. Is embedded in a rigid urethane foam between the outer and inner boxes.

According to the present invention, the vacuum heat insulating material is arranged from the place having a large passing heat gradient inside and outside the box, and when the coverage exceeds about 50% of the outer box surface area, the heat absorption load of the refrigerator is increased. Can be effectively suppressed, and the energy saving effect can be enhanced.

On the other hand, by keeping the coverage rate at 80% or less, the heat absorption amount of the vacuum heat insulating material is reduced due to the use of a vacuum heat insulating material having a non-standard form and the work of disposing the vacuum heat insulating material in a portion where work efficiency is poor. It is possible to avoid a sharp increase in the cost ratio with respect to, and to effectively suppress the heat absorption load amount and enhance the energy saving effect in a state where the vacuum insulation material has a high utility value.

Further, when the refrigerator is installed in the system kitchen, furniture is placed on the left and right of the refrigerator, and heat is radiated from the high temperature refrigerant pipe, the surface temperature of the refrigerator is 40 degrees.
Assuming a case of exceeding ℃, for the part where the outer case surface temperature is higher than the outside air temperature, the vacuum heat insulating material is embedded in the rigid urethane foam between the outer case and the inner case. It is possible to minimize deterioration of the vacuum heat insulating performance with time. Further, since the vacuum heat insulating material is embedded in the hard urethane foam, it is possible to suppress irregularities and waviness on the surface of the outer box, and it is possible to maintain a beautiful appearance.

A refrigerator according to claim 2 of the present invention comprises a hard urethane foam and a vacuum heat insulating material between an outer box and an inner box, and the vacuum heat insulating material is provided on both sides, top, back, bottom and front. In a refrigerator which is arranged on each surface and has a coverage of the vacuum heat insulating material of more than 50% and 80% or less with respect to the surface area of the outer box, there are inclusions other than the hard urethane foam and the vacuum heat insulating material near the inner side of the outer box. On the surface, the vacuum heat insulating material is embedded in the rigid urethane foam between the outer and inner boxes.

According to the present invention, as in the refrigerator according to the first aspect, the coverage of the vacuum heat insulating material with respect to the surface area of the outer box is 5%.
When it is more than 0% and 80% or less, the heat absorption load amount can be effectively suppressed in a state where the vacuum heat insulating material has a high utility value, and the energy saving effect can be enhanced.

Further, on a surface having inclusions other than the hard urethane foam and the vacuum heat insulating material such as a door handle and a high temperature refrigerant pipe for heat radiation, the vacuum heat insulating material is embedded in the hard urethane foam between the outer box and the inner box. By doing so, the heat absorption load amount can be effectively suppressed in a state where the utilization value of the vacuum heat insulating material is high without reducing the coverage of the vacuum heat insulating material.

A refrigerator according to claim 3 of the present invention is the refrigerator according to claim 1 or 2, wherein the vacuum heat insulating material is composed of a core material and a gas barrier film covering the core material. In the second aspect, the film surface made of the aluminum vapor deposition layer is provided on the inner box side among the film surfaces made of the metal foil layer and the aluminum vapor deposition layer which form the gas barrier film.

According to the present invention, by disposing the vacuum heat insulating material with the aluminum vapor deposition layer having a low gas barrier performance on the inner box side, it is possible to suppress deterioration of the heat insulating performance of the vacuum heat insulating material with time. Furthermore, for the part where the surface temperature of the outer box is expected to be higher than the outside air temperature, the vacuum heat insulating material is embedded in the hard urethane foam between the outer and inner boxes, so that the heat insulating performance is further improved over time. The effect of suppressing deterioration is enhanced.

A refrigerator according to a fourth aspect of the present invention is the refrigerator according to any one of the first to third aspects, wherein a vacuum heat insulating material is embedded in a rigid urethane foam between the outer box and the inner box. Regarding the surface, the distance between the vacuum heat insulating material and the outer box or the inner box is gradually increased along the foaming direction of the rigid urethane foam.

According to the present invention, by gradually increasing the distance between the vacuum heat insulating material and the outer or inner box along the direction in which the rigid urethane foam is foamed after filling, the rigid urethane foam It is possible to deal with the phenomenon that the foaming power becomes weaker in the latter half of the foaming after filling than in the initial foaming, and the rigid urethane foam can be foamed uniformly without stagnation in the latter half of foaming. As a result, it is possible to maximize the heat insulating performance in the case where the hard urethane foam is laminated with the vacuum heat insulating material, and the energy saving effect can be enhanced.

A refrigerator according to a fifth aspect of the present invention is the refrigerator according to any one of the first to fourth aspects, wherein a vacuum heat insulating material is embedded in a rigid urethane foam between the outer box and the inner box. With respect to the surface, the height of the spacer provided on the back side is set to be equal to or higher than the height of the spacer provided on the front side.

According to the present invention, not only the vacuum heat insulating material is fixed by the spacer provided between the outer box and the vacuum heat insulating material, but also the height of the spacer provided on the rear side of the refrigerator is provided on the front side. It is possible to gradually increase the distance between the vacuum heat insulating material and the outer box or the inner box along the foaming direction of the rigid urethane foam simply by setting the height to or more. Further, since the spacer can strongly bond the outer box and the vacuum heat insulating material with the hot melt adhesive, there is no problem that the vacuum heat insulating material moves due to foaming of the rigid urethane foam. Furthermore, since the vacuum heat insulating material is fixed with a hot melt adhesive, the spacer can be placed at an appropriate position, and the vacuum heat insulating can occur when the foaming pressure of the rigid urethane foam is different between the front and back of the vacuum heat insulating material. The warpage of the material can be eliminated. As a result, the vacuum heat insulating material can be embedded in the homogeneous rigid urethane foam with a high coverage, and the energy saving effect can be enhanced.

According to a sixth aspect of the present invention, there is provided a refrigerator according to any one of the first to fifth aspects, wherein vacuum insulation is provided on both side surfaces, a top surface, a back surface, a bottom surface, and a front surface. It is configured so that the distance between the materials is at least the smaller of the distance between the vacuum insulation material embedded in the rigid urethane foam in the middle of the outer and inner boxes and the outer or inner box. is there.

According to the present invention, the fluidity of the rigid urethane foam can be maintained by setting the distance between the vacuum heat insulating materials to be equal to or more than the minimum thickness at which the rigid urethane foam can be filled. A homogeneous urethane layer can be formed on the part. As a result, not only does the deterioration of the heat insulation performance due to the roughness and insufficient foaming of the rigid urethane foam occur, but also the strength of the box body can be maintained.

A refrigerator according to a seventh aspect of the present invention is the refrigerator according to any one of the first to sixth aspects, wherein a vacuum heat insulating material is provided on the front side bent end surface and both side surfaces of the outer box. Configured so that the distance between the front end and the end face is equal to or greater than the smaller of the distance between the vacuum insulation material embedded in the rigid urethane foam and the outer or inner box between the outer and inner boxes. It was done.

According to the present invention, the fluidity of the rigid urethane foam can be maintained by setting the distance between the end surfaces to be equal to or more than the minimum thickness that allows the rigid urethane foam to be filled. A homogeneous urethane layer can be formed. As a result, not only does the deterioration of the heat insulation performance due to the roughness and insufficient foaming of the rigid urethane foam occur, but also the strength of the box body can be maintained.

A refrigerator according to claim 8 of the present invention is the refrigerator according to any one of claims 1 to 7, wherein the rigid urethane foam is injected from an injection port provided on the back surface of the outer box. It was done.

According to the present invention, since it is possible to directly fill urethane on both side wall surfaces of a refrigerator in which it is assumed that the vacuum heat insulating material is embedded in the rigid urethane foam between the outer box and the inner box. A homogeneous rigid urethane foam can be formed without causing roughness or insufficient foaming in the space formed between the box or inner box and the vacuum heat insulating material. As a result, it is possible to enhance the energy saving effect without lowering the heat insulating performance and also to maintain the box strength.

According to a ninth aspect of the present invention, in the refrigerator according to the eighth aspect, the distance between the vacuum heat insulating material and the outer box or the inner box in which the rigid urethane foam is injected is set to the back side. It is configured to have a diameter equal to or larger than the injection port of the provided rigid urethane foam.

According to the present invention, the space on the side for injecting the rigid urethane foam is made equal to or larger than the injection port diameter, so that the urethane injected in the liquid state is directly injected into the front bent end surface portion of the outer box without foaming. can do. As a result, the rigid urethane foam can be foamed at the same speed on the outside and inside of the vacuum heat insulating material disposed in the intermediate position between the outer and inner boxes, so that the front and back surfaces of the vacuum heat insulating material can be foamed. A uniform urethane layer can be formed to enhance the energy saving effect, and at the same time, the box strength can be maintained.

A refrigerator according to a tenth aspect of the present invention is the refrigerator according to the ninth aspect, wherein the rigid urethane foam is not directly injected into the space formed between the vacuum heat insulating material and the outer or inner box. The spatial distance of is smaller than the spatial distance of the injection side.

According to the present invention, by making the thickness of the space on the side opposite to the side on which the rigid urethane foam is injected through the vacuum heat insulating material thin enough to maintain the fluidity of urethane, Provide a refrigerator that can realize the thinnest wall thickness when the vacuum insulation material is embedded in hard urethane foam between the outer box and the inner box, has high internal volume efficiency, and meets the demand for space saving. be able to.

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment) FIGS. 1 to 4 show a refrigerator according to an embodiment of the present invention. FIG. 1 shows a front sectional view of the refrigerator, and FIG. 2 shows a side sectional view of the refrigerator. In FIG. 1 and FIG. 2, 21 is a refrigerator main body, 22 is a heat insulating box including a door 10, and is formed from an inner box 2 made of synthetic resin such as ABS and an outer box 1 made of metal such as an iron plate. Hard urethane foam 4 and vacuum insulation 3 in space 23
a, 3b and 3c are arranged in a multilayer structure. In manufacturing the heat insulating box 22, the vacuum heat insulating materials 3a to 3c are directly or indirectly adhered and fixed to the outer box 1 or the inner box 2 in advance, and then the raw material of the rigid urethane foam 4 is injected to perform integral foaming.

Further, the heat insulating box 22 is divided into rooms of respective temperature zones, 12 is a freezing room, 15 is a refrigerating room, and 16 is a vegetable room. The freezer compartment 12 is generally -15 ° C to -2.
In the freezing area of 5 ° C, the refrigerator compartment 15 and the vegetable compartment 16 are generally 0
It is set in the refrigeration area at 10 ° C. Reference numeral 17 is a compressor, 18 is a condenser, and 19 is a cooler, which constitutes a cooling device.
That is, the refrigerator main body 21 includes the heat insulating box 22 and the freezer compartment 1.
2. A cooling device including a refrigerating chamber 15, a vegetable chamber 16 and a compressor 17, a condenser 18, and a cooler 19 for cooling the chambers in these temperature zones.

The vacuum heat insulating material 3a on the side surface and the top surface of the heat insulating box 22 is arranged so as to contact the outer box 1 and constitutes a part of the cooling device. It is embedded in the hard urethane foam 4 between the outer box 1 and the inner box 2 while avoiding the above. Further, in the door 10, the vacuum heat insulating material 3a is embedded in the hard urethane foam 4 between the outer surface and the inner surface of the door while avoiding the handle 10a.
The vacuum heat insulating material 3a is adhesively fixed to the outer surfaces of the outer box 1 and the door 10 by a spacer 24 to which a double-sided tape is attached. Further, the vacuum heat insulating material 3b is bonded and fixed to the back plate 25 forming a part of the outer box 1 of the heat insulating box 22 using a hot melt adhesive, and the vacuum heat insulating material 3c is the bottom surface of the heat insulating box 22. In the above, the inner box 2 is adhesively fixed with double-sided tape.

The distance d between the vacuum heat insulating material 3a and the outer box 1
1 is equal to or more than the distance d2 to the inner box 2, and the abutting distance d3 of the vacuum heat insulating materials 3a to 3c arranged on both side surfaces, the top surface, the back surface, and the bottom surface of the heat insulating box body 22 is the distance d1 or more. Then configured.

As a result, the vacuum heat insulating materials 3a to 3c are evenly arranged on both side surfaces, the top surface, the back surface, the bottom surface of the heat insulating box body 22 and each surface of the door 10, and 80% of the surface area of the outer box 1 is provided. It is occupy and arranged.

Here, the thickness of the heat insulating wall of the heat insulating box 22 is equal to that of the door 1
Excluding 0, including the thin wall portion of the opening, the freezer compartment 12
25 to 50 mm in the freezing area, and 25 to 40 in the refrigerating area of the refrigerator compartment 15 and the vegetable compartment 16.
The thickness is within the range of 15 mm, and the thickness of this insulation wall is 15 mm.
The vacuum heat insulating materials 3a to 3c are provided. Therefore, the outer distance d1 of the vacuum heat insulating material 3a embedded in the hard urethane foam 4 between the outer box 1 and the inner box 2 is ensured so that the thickness of the hard urethane foam 4 filled is at least 5 mm. As a result, the thickness of the hard urethane foam 4 filled inside the vacuum heat insulating material 3b and outside the vacuum heat insulating material 3c can be at least 10 mm.

FIG. 3 shows an enlarged view of the heat insulating structure on the side wall of the refrigerator. In FIG. 3, the vacuum heat insulating material 3a is an outer cover obtained by heating and drying the inorganic fiber aggregate 31 such as glass wool, and then bonding the metal foil layer film 32a made of aluminum foil and the vapor deposition layer film 32b obtained by aluminum vapor deposition. It is formed by inserting it into the material 32 and drawing the inside vacuum to seal the opening. Further, the metal foil layer film 32a having a high gas barrier property is arranged so as to be on the outer box 1 side, and the vapor deposition layer film 32b is arranged on the inner box 2 side. In addition,
Also for the vacuum heat insulating materials 3b and 3c, the outer covering material 32 is composed of a metal foil layer film 32a and a vapor deposition layer film 32b,
The outer box 1 and the inner box 2 have the same positional relationship.

Here, when the fiber diameter of the inorganic fiber aggregate 31 is in the range of 0.1 μm to 1.0 μm and the thermal conductivity of the rigid urethane foam 4 is 0.015 W / mK, it is the same. Thermal conductivity is 0.001
The vacuum heat insulating materials 3a to 3c are applied as the heat insulating material of 5 W / mK. In other words, the vacuum heat insulating materials 3a to 3c having the heat insulating performance 10 times higher than the hard urethane foam 4 are applied.

The metal foil layer film 32a constituting the outer cover material 32 was made of polyethylene terephthalate (12 μm) as a surface protective layer, and an aluminum foil (6 μm) was used as an intermediate portion.
m), the heat-sealing layer is composed of a laminated film made of high-density polyethylene (50 μm), and the vapor deposition layer film 32b which is the other surface has a surface protective layer of polyethylene terephthalate (12 μm) and an intermediate portion of ethylene-
The vinyl alcohol copolymer resin composition (15 μm) has a film layer on which aluminum is vapor-deposited, and the heat-sealing layer is a laminated film made of high-density polyethylene (50 μm). Further, in the outer covering material 32, a nylon resin layer is formed as a surface protective layer in order to improve scratch resistance.

FIG. 4 shows a horizontal sectional view of the refrigerator. In FIG. 4, for the spacer 24 fixing the vacuum heat insulating material 3a, the height of the spacer 24 attached to the back side of the heat insulating box 22 is set to be larger than the height of the spacer 24 attached to the front side. I am configuring.

Further, the vacuum heat insulating material 3 for the heat insulating box 22 is provided.
The distance d5 between the end surfaces formed by the front end surface of a and the front bent end surface of the outer box 1 is set to be a distance d1 or more between the vacuum heat insulating material 3a and the outer box 1.

A back plate 25 forming a part of the outer box 1
Is provided with an injection port 26 for injecting the rigid urethane foam 4, and the distance d7 between the vacuum heat insulating material 3a into which the rigid urethane foam 4 is directly injected and the inner box 2 is equal to or larger than the diameter of the injection port 26.

Further, the space distance d8 between the vacuum heat insulating material 3a in which the hard urethane foam 4 is not directly injected and the outer case 1 is set to be smaller than the space distance d7 in which the hard urethane foam 4 is directly injected.

In the above structure, the vacuum heat insulating material 3
In the case where a large amount of a to 3c are arranged to increase the coverage to the maximum, in the parts (not shown) of the refrigerator main body 21 or where there is a special structure (uneven shape, pipe, installation part of drain pipe, etc.) Along with the need for a special form of vacuum insulation,
The workability of attaching the vacuum heat insulating material becomes very poor.

For this reason, even if the vacuum heat insulating materials 3a to 3c are to be disposed over 80% of the surface area of the outer box 1, the vacuum heat insulating material should be attached even to the places where the use efficiency is poor and the utility value is saturated. Therefore, the effect of improving the heat insulation performance with respect to the addition of the vacuum heat insulating material is significantly reduced.

Therefore, as in the present embodiment, the coverage of the vacuum heat insulating materials 3a to 3c with respect to the outer area of the outer box 1 is set to 8.
By keeping it to 0%, the effect of using a large amount of the vacuum heat insulating materials 3a to 3c is not saturated, and the heat absorption load amount can be effectively suppressed in a state of high utility value, and the energy saving effect is enhanced. be able to.

In order to achieve a coverage of 80%, a vacuum of a large size that can substantially cover both side surfaces, the top surface, the back surface, the bottom surface, and the front surface of the heat insulating box 22, that is, each surface of the door 10. It is preferable to dispose the heat insulating materials 3a to 3c, so that the vacuum heat insulating material has good heat insulating efficiency and also improves the workability of attachment.

As a result of the above, the vacuum heat insulating materials 3a to 3c are arranged on both side surfaces, the top surface, the back surface, the bottom surface, and the front surface of the heat insulating box body 22, and the vacuum heat insulating materials 3a to 3a to the outer area of the outer box 1 are arranged.
By keeping the coverage of 3c at 80%, it is possible to secure a balance between an increase in the initial cost of the refrigerator main body 21 using the vacuum heat insulating materials 3a to 3c and a reduction in the running cost due to energy saving, and as a life cycle cost. The value of can be increased.

The vacuum heat insulating materials 3a to 3c are arranged from the inside and outside of the heat insulating box 22 where the passage heat gradient is large, so that the heat is insulated when the coverage exceeds about 50% of the outer area of the outer box 1. The heat absorption load of the box can be effectively suppressed, and the energy saving effect can be enhanced. However, in the present embodiment, the outer dimensions of the heat insulating box 22 are 1800 mm in height and 675 m in width.
m and depth 650 mm.

Further, the vacuum heat insulating material 3a provided on both side surfaces and the top surface of the heat insulating box 22 is embedded in the rigid urethane foam 4 between the outer box 1 and the inner box 2 and placed in contact with the outer box 1. An unillustrated high temperature refrigerant pipe for heat radiation, which is a component of the cooling device, is provided between the outer box 1 and the vacuum heat insulating material 3a. With this configuration, of the amount of heat released from the high temperature refrigerant pipe,
The amount of heat radiation entering the refrigerator body 21 can be reduced to about 1/3, and the heat absorption load of the entire refrigerator can be effectively reduced.

When the refrigerator main body 21 is incorporated in the system kitchen, or when the left and right sides of the refrigerator main body 21 are covered with furniture, both sides and the top surface of the refrigerator main body 21 are radiated by the heat radiation of the high temperature refrigerant pipe. Is approximately 40 ° C. or higher, and when the vacuum heat insulating material 3a is adhered and fixed to the outer case 1, the temperature of the vacuum heat insulating material 3a becomes approximately the same as the temperature of the outer case 1, and There arises a problem that the heat insulation performance remarkably decreases with time. In contrast,
When the vacuum heat insulating material 3a is embedded in the hard urethane foam 4 between the outer case 1 and the inner case 2, it is possible to keep the temperature of the vacuum heat insulating material 3a lower than the temperature of the outer case 1 by about 3 ° C. or more. Therefore, it is possible to suppress deterioration of the heat insulating performance with time.

Furthermore, by disposing the vacuum heat insulating material 3a with the metal foil layer film 32a side having excellent gas barrier property facing the outer box 1 side of the outer covering material 32 of the vacuum heat insulating material 3a, the It is possible to suppress deterioration of the heat insulating performance of the vacuum heat insulating material 3a with time.

In comparison with the case where the vacuum heat insulating material is attached to the outer box 1, when the vacuum heat insulating material is embedded between the outer box 1 and the inner box 2, the space between the outer side and the inner side of the heat insulating box 22 is reduced. Since the projected area of heat passage can be effectively covered inside, the substantial coverage can be reasonably increased even if the area of use of the vacuum heat insulating material 3a is the same.

On the other hand, with respect to the door 10, by embedding the vacuum heat insulating material 3a in the intermediate layer while avoiding the handle 10a,
By attaching the vacuum heat insulating material 3a having a large area, the coverage can be increased, and the heat absorption load amount can be effectively reduced.

Furthermore, since the entire outer surface of the vacuum heat insulating material 3a is in close contact with the rigid urethane foam 4, the strength of the heat insulating box body 22 due to the peeling that occurs when the vacuum heat insulating material is brought into direct contact with the outer box 1 or the inner box 2. Does not occur.

Further, since the vacuum heat insulating material 3a does not directly contact the outer surface of the outer box 1 or the door 10, the foaming agent of the hard urethane foam 4 is provided in the gap between the outer surface of the outer box 1 or the door 10 and the vacuum heat insulating material 3a. Does not aggregate. As a result, the foaming agent does not expand or contract due to the change in the environmental temperature and the appearance is not deformed. Therefore, the quality and value of the refrigerator can be maintained without impairing the side surface of the heat insulating box 22 and the exterior of the door 10 that are easily noticeable from the outside.

The vacuum heat insulating material may be arranged in the middle of the outer case 1 and the inner case 2 over the entire area of the heat insulating box 22 if possible, but in the present embodiment, the heat insulating box is intentionally taken. The vacuum heat insulating material 3b arranged on the back surface of the body 22 is fixed to the back plate 25, and the vacuum heat insulating material 3c arranged on the bottom surface of the heat insulating box body 22 is fixed to the inner box 2.

This is because when the vacuum heat insulating material 3b is provided on the back surface of the heat insulating box 22, the vacuum heat insulating material 3b interferes with the piping of the cooling device and the drain pipe for draining defrost water of the cooler 19. This is because it is preferable in terms of manufacturing process to assemble the back plate 25 and the vacuum heat insulating material 3b as an integrated product in consideration of such a problem.

The vacuum heat insulating material 3c disposed on the bottom surface of the heat insulating box 22 is fixed to the inner box 2 by adhesion.
This is to prevent the influence of the temperature of the machine room 20 which exceeds approximately 40 ° C. from reaching the vacuum heat insulating material 3c due to heat radiation from the condenser 7 and the condenser 18 and causing the deterioration of the heat insulating performance of the vacuum heat insulating material with time.

On the other hand, the thickness d1 of the hard urethane foam 4 formed on the outside of the vacuum heat insulating material 3a is 5 mm which is less than the thickness d2 of the hard urethane foam 4 formed on the inside.
And the thickness of the hard urethane foam formed on the outside or inside of the vacuum heat insulating materials 3b and 3c is 10 mm. Therefore, the flowability of the rigid urethane foam 4 at the time of foaming is not impeded, the heat insulation performance is not deteriorated due to the roughness of the foam and the filling failure, and the strength of the heat insulation box is not deteriorated.

Further, the abutting distance d3 of the vacuum heat insulating materials 3a to 3c arranged on both side surfaces, the top surface, the back surface and the bottom surface of the heat insulating box 22 is not less than the thickness d1 of the hard urethane foam 4 outside the vacuum heat insulating material 3a. Therefore, the flowability of the rigid urethane foam 4 at the abutting portion at the time of foaming is not hindered, and the insulation performance is not deteriorated due to the roughness of the foam or defective filling, and the strength of the heat insulation box 22 is not reduced.

As described above, the thickness of the vacuum heat insulating materials 3a to 3c is ensured and the heat insulating performance of the vacuum heat insulating material is sufficiently exhibited, and at the same time, the heat insulating performance of the rigid urethane foam 4 is firmly maintained. The heat insulating performance as the heat insulating wall can be effectively enhanced, and it is particularly effective in the freezing temperature region where the temperature gradient inside and outside the refrigerator is large.

By setting the heat insulating wall thickness of the freezing compartment 12 to 50 mm or less, the vacuum insulating materials 3a to 3c are applied to the freezing compartment 12 having a relatively small volume ratio without affecting the external layout. It can also be used to increase the volumetric efficiency, and the utility value of the vacuum heat insulating material can be further enhanced.

Further, by setting the heat insulation wall thickness of the refrigerating compartment 15 and the vegetable compartment 16 to 40 mm or less, even in the refrigerating temperature region where the temperature gradient inside and outside the refrigerator is relatively small, the vacuum heat insulating materials 3a to 3a.
The effect of improving the volumetric efficiency can be obtained by applying c.

Further, if the contribution of the vacuum heat insulating material 3a to the internal volume is not utilized for expanding the internal volume but is diverted to the compact external volume, it is possible to save the installation space of the refrigerator main body 21. .

It is to be noted that the thickness of the heat insulating wall of the door 10 is not intentionally defined within these ranges in consideration of ensuring the strength of the door 10 for supporting the items stored in the refrigerator and the existence of the handle 10a and the uneven portion on the design. This is because there are cases.

The thickness of the vacuum heat insulating materials 3a to 3c is 10
If it is up to about mm, the effect of so-called heat bridge through the outer covering material 32 is not relatively large, and the heat insulating performance of a single item can be generally maintained, so that the expected heat insulating effect can be obtained. On the other hand, it is possible to increase the thickness of the vacuum heat insulating materials 3a to 3c to enhance the heat insulating effect, but in this case, there is a risk of impeding the fluidity of the rigid urethane foam 4,
Rather, it is more rational to divide the thickness and deploy it on other surfaces. Therefore, the thickness of the vacuum heat insulating materials 3a to 3c is 10 mm to
15 mm is suitable.

On the other hand, by injecting the rigid urethane foam 4 from the inlet provided on the back plate 25 of the heat insulating box 22, urethane is directly applied around the vacuum heat insulating material 3a provided on both side surfaces of the heat insulating box 22. Can be injected. At this time, by setting the distance d7 between the vacuum heat insulating material 3a into which the rigid urethane foam 4 is directly injected and the inner box 2 to be a width equal to or larger than the injection port diameter d6 of the rigid urethane foam 4, the rigid urethane foam 4 injected in a liquid state can be obtained. It can be directly injected into the front surface of the heat insulating box 22, and the foaming process after injection can be smoothly performed.

Further, the vacuum heat insulating material 3 for the heat insulating box 22 is provided.
By setting the inter-face distance d5 between the front end surface of a and the front bent end surface of the outer box 1 to be equal to or more than the distance d1 between the vacuum heat insulating material 3a and the outer box 1, the hard urethane foam 4 injected in a liquid state is retained. Instead, it can be foamed on the front and back of the vacuum heat insulating material 3a.

In the latter half of the foaming process, the foaming force is weakened by gradually increasing the space distance between the vacuum heat insulating material 3a and the outer case 1 into which the hard urethane foam 4 is not directly injected along the foaming direction. It does not cause problems such as insufficient filling.

As a method of gradually increasing the spatial distance between the vacuum heat insulating material 3a and the outer case 1 along the foaming direction,
Only by adjusting the height of the spacer 24 fixing the vacuum heat insulating material 3a, it is possible to secure the fluidity of the rigid urethane foam by a simple method.

As a result, the hard urethane foam 4 after injection is foamed on the front and back surfaces of the vacuum heat insulating material 3a at the same foaming speed, and it is possible to form the hard urethane foam 4 that is uniform on both the front and back surfaces of the vacuum heat insulating material 3a. .

Further, in this case, since the foaming pressure applied to the front and back of the vacuum heat insulating material 3a is about the same, the vacuum heat insulating material 3a is
Does not warp due to the difference in foaming pressure, so that the heat insulation performance and strength are not deteriorated due to insufficient filling of the rigid urethane foam 4 on the front and back of the vacuum heat insulating material 3a, and peeling causes a problem in appearance. It does not cause a phenomenon.

Further, by making the distance d8 between the outer case 1 in which the rigid urethane foam is not directly injected and the vacuum heat insulating material 3a smaller than the distance d7 in the inner case side where the direct injection is made, the wall thickness of both side surfaces of the heat insulating box 22 is reduced. Can be kept within the wall thickness described above, and the wall thickness can be reduced to improve the volume efficiency and save the installation space of the refrigerator main body 21.

In the embodiment of the present invention, the vacuum heat insulating material 3a is used.
When the thermal conductivity of the rigid urethane foam 4 is 0.015 W / mK, 0.0015 and 1 /
Although 10 of the above are used, the inorganic fiber aggregates 31 having different fiber diameters are adopted, and thus 0.0010 W / mK
˜0.0030 W / mK, and a ratio range of 1/15 to 1/5 may be used. This is because the thickness of the vacuum heat insulating materials 3a to 3c is reduced in order not to impede the fluidity of the hard urethane foam 4 when the multilayer heat insulating wall thickness of the hard urethane foam 4 and the vacuum heat insulating materials 3a to 3c is relatively thin. This is because even if it is done, the heat insulating performance as a multi-layer heat insulating wall is effectively exhibited. Further, in order to realize a high coverage, the vacuum heat insulating material 3a to
This is because 3c is provided and the energy saving effect is exhibited as expected.

[0080]

As described above, according to the invention of claim 1,
When the coverage of the vacuum heat insulating material with respect to the surface area of the outer box is more than 50% and 80% or less, the heat absorption load amount can be effectively suppressed and the energy saving effect can be enhanced while the vacuum heat insulating material has a high utility value. Furthermore, when the refrigerator is installed in the system kitchen or when the surface temperature of the refrigerator becomes higher than the outside air temperature due to heat radiation from the high-temperature refrigerant pipes, the vacuum insulation performance deteriorates over time. Can be kept to a minimum. In addition, it is possible to suppress irregularities and waviness on the surface of the outer box, and it is possible to obtain an advantageous effect that the beauty of the appearance can be maintained.

According to the second aspect of the present invention, since the coverage of the vacuum heat insulating material with respect to the surface area of the outer box is more than 50% and 80% or less, the endothermic load is increased in a state where the vacuum heat insulating material has a high utility value. It can be effectively suppressed and the energy saving effect can be enhanced. In addition, even in the presence of inclusions other than the vacuum insulation material such as hard urethane foam and high-temperature refrigerant piping for heat dissipation, such as door handles and vacuum insulation materials, the utilization value of the vacuum insulation material is high without reducing the coverage of the vacuum insulation material. The heat absorption load amount can be effectively suppressed. In addition, it is possible to suppress irregularities and waviness on the surface of the outer box, and it is possible to obtain an advantageous effect that the beauty of the appearance can be maintained.

According to the third aspect of the invention, by disposing the vacuum heat insulating material on the inner box side of the aluminum vapor deposition layer having a low gas barrier performance, deterioration of the heat insulating performance of the vacuum heat insulating material over time is suppressed. can do. Furthermore, for the part where the surface temperature of the outer box is expected to be higher than the outside air temperature, the vacuum heat insulating material is embedded in the hard urethane foam between the outer and inner boxes, so that the heat insulating performance is further improved over time. The effect of suppressing deterioration is enhanced.

According to the invention of claim 4, the distance between the vacuum heat insulating material and the outer or inner box is gradually increased along the direction in which the rigid urethane foam is foamed after filling. It is possible to deal with the phenomenon that the foaming power becomes weaker in the latter half of the foaming after the filling of the rigid urethane foam in the latter half, and the rigid urethane foam can be uniformly foamed in the latter half of the foaming without stagnation. As a result, it is possible to maximize the heat insulating performance of the rigid urethane foam when the vacuum heat insulating material is laminated, and to enhance the energy saving effect.

According to the fifth aspect of the present invention, not only the vacuum heat insulating material is fixed by the spacer provided between the outer box and the vacuum heat insulating material, but also the height of the spacer provided on the rear side of the refrigerator is adjusted to the front side. The distance between the vacuum heat insulating material and the outer box or the inner box can be gradually increased along the foaming direction of the rigid urethane foam simply by setting the height of the spacer provided on the side or more. Further, since the spacer can strongly bond the outer box and the vacuum heat insulating material with the hot melt adhesive, there is no problem that the vacuum heat insulating material moves due to foaming of the rigid urethane foam. Furthermore, since the vacuum heat insulating material is fixed with a hot melt adhesive, the spacer can be placed at an appropriate position, and the vacuum heat insulating can occur when the foaming pressure of the rigid urethane foam is different between the front and back of the vacuum heat insulating material. The warpage of the material can be eliminated. as a result,
The vacuum heat insulating material can be embedded at a high coverage in a homogeneous rigid urethane foam, and the energy saving effect can be enhanced.

According to the invention of claim 6, the fluidity of the rigid urethane foam is maintained by setting the distance between the vacuum heat insulating materials to be the minimum thickness or more at which the rigid urethane foam can be filled. Therefore, a uniform urethane layer can be formed at the abutting portion.
This not only does not cause deterioration of the heat insulation performance due to the roughness of the rigid urethane foam and insufficient foaming,
The box strength can also be maintained.

Further, according to the invention of claim 7, it is possible to fill the rigid urethane foam with the distance between the end faces formed by the front end face of the vacuum heat insulating material and the bent end face of the outer box front face with respect to the heat insulating box. By setting the thickness to the minimum thickness or more, the flowability of the rigid urethane foam can be maintained, so that a uniform urethane layer can be formed between the end faces. As a result, not only does the deterioration of the heat insulation performance due to the roughness and insufficient foaming of the rigid urethane foam occur, but also the strength of the box body can be maintained.

Further, according to the invention of claim 8, urethane is directly injected into the vacuum heat insulating material embedded in the middle of the outer box and the inner box from the injection port of the hard urethane foam provided on the back surface of the outer box. Since it can be injected, a rigid urethane foam that is efficient and uniform can be formed. As a result, the energy saving effect can be enhanced, and
The box strength can also be maintained.

According to the invention of claim 9, the space on the side for injecting the rigid urethane foam is made equal to or larger than the injection port diameter so that the urethane injected in the liquid state is directly bent without front surface foaming. It can be injected up to the end face portion. As a result, the rigid urethane foam can be foamed at the same speed on the outside and inside of the vacuum heat insulating material disposed in the intermediate position between the outer and inner boxes, so that the front and back surfaces of the vacuum heat insulating material can be foamed. A uniform urethane layer can be formed to enhance the energy saving effect, and at the same time, the box strength can be maintained.

According to the tenth aspect of the present invention, the thickness of the space on the side opposite to the space on the side where the rigid urethane foam is injected via the vacuum heat insulating material is set to a thickness capable of maintaining the fluidity of the urethane. As a result, a thin wall thickness can be realized even when the vacuum heat insulating material is embedded in the rigid urethane foam between the outer box and the inner box, and the inner volume efficiency is high,
It is possible to provide a refrigerator that meets the demand for space saving.

[Brief description of drawings]

FIG. 1 is a front sectional view of a refrigerator according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of the refrigerator according to the same embodiment.

FIG. 3 is an enlarged view of the heat insulating structure of the refrigerator side wall of the same embodiment.

FIG. 4 is a horizontal sectional view of the refrigerator according to the same embodiment.

FIG. 5 is a side sectional view of a conventional refrigerator.

FIG. 6 is a horizontal sectional view of a conventional refrigerator.

FIG. 7 is an enlarged sectional view of a heat insulating wall of a conventional refrigerator.

[Explanation of symbols]

1 outer box 2 inner box 3a Vacuum heat insulating material arranged in the intermediate layer 3b Vacuum heat insulating material to be placed on the back of the heat insulating box 3c Vacuum heat insulating material to be placed on the bottom of the heat insulating box 4 rigid urethane foam 21 Refrigerator body 22 Thermal insulation box 24 spacer 25 Back plate (outer box) 31 Inorganic fiber aggregate 32 jacket material 32a metal foil layer film 32b evaporation layer film

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinichi Hashimoto             4-2-5 Takaidahondori, Higashi-Osaka City, Osaka Prefecture               Within Matsushita Cold Machinery Co., Ltd. (72) Inventor Hidetoshi Takanishi             4-2-5 Takaidahondori, Higashi-Osaka City, Osaka Prefecture               Within Matsushita Cold Machinery Co., Ltd. (72) Inventor Kazuya Higami             4-2-5 Takaidahondori, Higashi-Osaka City, Osaka Prefecture               Within Matsushita Cold Machinery Co., Ltd. F-term (reference) 3L102 JA01 MA01 MA02 MA07 MB24                       MB27

Claims (10)

[Claims] 1. A hard urethane foam and a vacuum heat insulating material are provided between an outer box and an inner box, and the vacuum heat insulating material is arranged on each side surface, the top surface, the back surface, the bottom surface, and the front surface of the outer box. In a refrigerator having a coverage of vacuum insulation of more than 50% and less than 80% with respect to the surface area, when the surface temperature of the outer box is higher than the outside air temperature, the vacuum insulation should be placed between the outer box and the inner box. A refrigerator characterized by being embedded in hard urethane foam. 2. A hard urethane foam and a vacuum heat insulating material are provided between the outer box and the inner box, and the vacuum heat insulating material is arranged on each side surface, the top surface, the back surface, the bottom surface and the front surface of the outer box. In a refrigerator where the coverage of the vacuum heat insulating material is more than 50% and 80% or less with respect to the surface area, the vacuum heat insulating material is removed from the surface where there are inclusions other than the hard urethane foam and the vacuum heat insulating material near the inside of the outer box. A refrigerator characterized by being embedded in a rigid urethane foam between the box and the inner box. 3. The vacuum heat insulating material comprising a core material and a gas barrier film covering the core material, wherein the film surface made of a metal foil layer forming the gas barrier film and the film surface made of an aluminum vapor deposition layer The refrigerator according to claim 1, wherein a film surface made of an aluminum vapor deposition layer is provided on the inner box side. 4. The distance between the vacuum heat insulating material and the outer box or the inner box is gradually increased along the foaming direction of the hard urethane foam on the surface where the vacuum heat insulating material is embedded in the hard urethane foam between the outer box and the inner box. The refrigerator according to claim 1, wherein the refrigerator is increased in size. 5. The height of the spacer provided on the back side is equal to or higher than the height of the spacer provided on the front side in the surface where the vacuum heat insulating material is embedded in the hard urethane foam between the outer box and the inner box. The refrigerator according to claim 4, wherein the refrigerator is a refrigerator. 6. A vacuum heat insulating material and an outer box in which a distance between vacuum heat insulating materials arranged on both side surfaces, a top surface, a back surface, a bottom surface, and a front surface is buried in a rigid urethane foam between the outer box and the inner box. The refrigerator according to any one of claims 1 to 5, characterized in that the distance from the inner box is smaller than the smaller distance. 7. A vacuum heat insulating material in which a distance between end faces of a front side bent end surface of an outer box and a front side end surface of a vacuum heat insulating material disposed on both side surfaces is embedded in a rigid urethane foam between the outer box and the inner box. 7. The distance between the outer box and the inner box or the smaller of the two, whichever is smaller, or more.
The refrigerator according to any one of 1. 8. The refrigerator according to claim 1, wherein the rigid urethane foam is injected through an injection port provided on the back surface of the outer box. 9. The distance of the space for injecting the rigid urethane foam among the spaces between the vacuum heat insulating material and the outer box or the inner box is equal to or larger than the injection port diameter of the rigid urethane foam provided on the back surface. The refrigerator according to 8. 10. In the space formed between the vacuum heat insulating material and the outer box or the inner box, the space distance on the side where the rigid urethane foam is not directly injected is smaller than the space distance on the injection side. The refrigerator according to claim 8 or 9.