JPH10205991A - Thermal insulation box of cooling refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent thermal insulation performance from deteriorating due to heat bridge of an evacuated insulator by setting the area of the evacuated insulator smaller on the outer box side smaller than that on the inner box side. SOLUTION: End face of evacuated insulators 71, 73 is inclined gradually outward from the end part toward the inside and the area of the evacuated insulators 71, 73 is set smaller on the outer box 2 (side plate 2A, back plate 2C) side than that on the inner box 3 side. Since the area of a gas barrier film on the surface area of the evacuated insulators 71, 73 touching the outer box 2 (side plate 2A, back plate 2C) is decreased, the quantity of heat intruding from the outside of the outer box 2 into the vegetable room or the cold storage room, as well as the refrigerating room 18, through the gas barrier film of the evacuated insulators 71, 73 is reduced thus suppressing adverse effect of heat bridge of the evacuated insulator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of filling a foam insulating material between an outer box and an inner box, attaching a vacuum insulating material to a surface of the outer box on the foam insulating material side, and burying the vacuum insulating material in the foam insulating material. The present invention relates to a heat insulating box of a cooling storage device comprising:

[0002]

2. Description of the Related Art Conventionally, household refrigerators of this kind are composed of an insulating box body in which a foam insulating material such as foamed polyurethane is filled by an in-situ foaming method between an outer box made of a steel sheet and an inner box made of a hard resin. And partition the inside of the heat insulation box (inside the storage)
In addition, by cooling with a predetermined cooling device, -2
It comprises a freezing room that is cooled to a freezing temperature such as 0 ° C., a refrigerated room that is maintained at a refrigerated temperature such as + 5 ° C., and a vegetable room for storing foods that do not want to be dried, such as vegetables.

In recent years, it has become necessary to reduce the wall thickness of the heat insulating box in order to reduce the installation space of the refrigerator or to prevent the expansion of the refrigerator while expanding the effective volume in the refrigerator. For example, JP-B-61-17263 (B32B5 / 18) and JP-B-63-35911 (F25D23 / 06), or JP-B-2-544.
No. 79 (F16L59 / 06) has come to use a vacuum heat insulating material.

[0004] This vacuum heat insulating material is provided in a bag formed by welding around a film (gas barrier film) having a multilayer laminate structure for preventing gas (air or the like) from permeating, and contains fine powder of silica, pearlite, etc., and glass. After inserting a heat insulating material (referred to as a core material) made of fiber or open-cell foamed polyurethane, the gas in the bag is evacuated and sealed in a vacuum state.

According to such a vacuum heat insulating material, 0.005 to
Since a thermal conductivity of 0.010 Kcal / mh ° C. is achieved, the wall thickness of the heat insulating box can be reduced by attaching the heat insulating material to the inner surface of the outer box (the surface on the side of the foamed heat insulating material) around the freezing room where low temperature is required. Even so, it can be expected that the heat that enters the freezer compartment from outside the outer box can be effectively reduced.

[0006]

Here, the surface of these vacuum heat insulating materials is not a core material but only a gas barrier film, and the gas barrier film is usually provided with a heat-sealing layer made of polyethylene or polypropylene on the inside. It is constituted by laminating a metal layer such as aluminum and a surface protective layer.

[0007] As described above, especially since the gas barrier film has the metal layer, its thermal conductivity is increased. Therefore, when the vacuum heat insulating material is adhered to the inner surface of the outer case, the amount of heat (hereinafter referred to as a heat bridge) that penetrates through the gas barrier film on the surface in close contact with the inner surface of the outer case and enters the inside of the storage from the outside of the outer case. There was a problem that was a major factor in lowering.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problems, and provides a heat insulating box of a cooling storage in which deterioration of heat insulating performance due to a heat bridge of a vacuum heat insulating material is effectively eliminated. Is what you do.

[0009]

According to the present invention, there is provided a heat insulating box of a cooling storage, wherein a foam insulating material is filled between an outer box and an inner box, and a vacuum insulating material is provided on a surface of the outer box on the foam insulating material side. A heat insulating material is attached and buried in a foamed heat insulating material, wherein the area of the outer box side surface of the vacuum heat insulating material is smaller than the area of the inner box side surface.

According to the present invention, a foam insulation material is filled between the outer box and the inner box, and a vacuum insulation material is attached to a surface of the outer box on the foam insulation material side, and is buried in the foam insulation material. In the heat-insulating box body of the cooling storage unit, the area of the outer box side surface of the vacuum heat insulating material is smaller than the area of the inner box side surface, so that the area where the gas barrier film of the vacuum heat insulating material contacts the outer box. Is reduced.

[0011] This makes it possible to reduce the amount of heat that travels through the gas barrier film of the vacuum heat insulating material and enters the inside of the cabinet from outside the outer box, and reduces the adverse effects of the heat bridge of the vacuum heat insulating material, thereby reducing heat insulation. The heat insulation performance of the box can be improved, and the cooling capacity of the cooling storage can be improved and the power consumption can be reduced.

[0012]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of a household refrigerator 1 as an embodiment of a cooling storage to which the present invention is applied, FIG. 2 is a front view of the refrigerator 1 without a door, FIG. 3 is a vertical sectional side view of the refrigerator 1, and FIG. 5, FIG. 5 is another longitudinal side view of the refrigerator 1, FIG. 6 is a sectional view taken along line AA of FIG. 5, FIG. 7 is a sectional view taken along line BB of FIG. 6, and FIG. 9 is a perspective exploded perspective view of the refrigerator 1, and FIG. 10 is an enlarged sectional view of the heat insulating box 6 of the present invention at the end of the vacuum heat insulating material 71.

The refrigerator 1 of the embodiment is an insulating box formed by filling a foam insulating material 4 such as polyurethane foam between an outer box 2 made of a steel plate opening forward and an inner box 3 made of a hard resin by an in-situ foaming method. The interior of the heat-insulating box 6 is vertically divided by a partition plate 7 provided at a substantially central portion, and the upper part of the partition plate 7 is maintained at a refrigeration temperature (about + 5 ° C.). Refrigeration room 8.

The lower part of the partition plate 7 is further divided into upper and lower portions by a heat insulating partition wall 9 having a substantially L-shaped cross section and containing a vacuum heat insulating material, and the space between the heat insulating partition wall 9 and the partition plate 7 is used for drying vegetables and the like. A vegetable compartment 17 for storing disliked food, and a freezer compartment 18 in which the lower part of the heat insulating partition wall 9 is cooled to a freezing temperature (about −20 ° C.).
And

The refrigerator compartment 8 has a plurality of upper and lower shelves 21.
・ The ice temperature (0 ° C to -3
(° C.) is formed. Also,
The front opening of the refrigerator compartment 8 is closed by a pivotable door 23 so as to be openable and closable.

Further, the refrigerator compartment duct 2 is provided at the back of the refrigerator compartment 8.
4 are formed vertically, and on the left and right sides thereof, a plurality of refrigerator air outlets 26 communicating with the upper end of the refrigerator compartment 24 and the refrigerator 8 are formed vertically. Further, an ice greenhouse cold air discharge port 25 is formed inside the ice greenhouse 22, and a cold storage room cool air return port 27 is formed at the back and bottom (partition plate 7).

A vegetable compartment cool air discharge port 31 communicating with the refrigerator compartment cool air return port 27 is formed in the upper rear portion of the vegetable compartment 17, and a vegetable compartment cool air return port 32 is formed in the upper right rear portion. . The front opening of the vegetable compartment 17 is openably and closably closed by a drawer-type door 33, and the door 33
A vegetable container 34 having an opening on the upper surface is attached to the back surface of the container, and the vegetable container 34 is disposed in the vegetable compartment 17 to store vegetables.

A cooling chamber 37 is defined at the back of the freezing chamber 18 by a partition plate 36, and extends from the back of the freezing chamber 18 to the back of the heat insulating partition wall 9.
In the cooling chamber 37, a cooler 38 constituting a cooling device is installed vertically, and a blower 39 is installed in the cooling chamber 37 above the cooler 38. Incidentally, 41
Denotes a defrost heater of the cooler 38.

The front opening of the freezer compartment 18 is closed by two upper and lower drawer-type doors 42 and 43 so as to be openable and closable. Attached, this container 44,
Reference numerals 46 are arranged above and below the freezer compartment 18 to store frozen food, ice cream, and the like.

The partition plate 36, the cooler 38 and the blower 3
A cooling air distribution duct 47 is formed between the cylinders 9, and freezing room cold air discharge ports 48, 49 communicating with the duct 47 and the freezing room 18 are formed in the partition plate 36 at the upper back of the containers 44, 46. Open correspondingly. In addition, a freezer compartment cool air return port 51 communicating with a lower portion of the cooling compartment 37 is formed behind the container 46.

A cool air distribution port 52 is formed in the upper part of the duct 47 at a side of the blower 39.
2 communicates with the lower end of the refrigerator compartment duct 24. In addition, beside the cooler 38, a cold air return duct 53 is provided in the refrigerator compartment / vegetable compartment.
The upper end of which is formed in the vegetable compartment cool air return port 3
The lower end thereof communicates with the inside of the cooling chamber 37 through a cold air return port 54 for opening the refrigerator compartment / vegetable compartment opened at the lower part of the cooling compartment 37. In FIG. 2, the heat insulating partition wall 9 and the partition plate 36 are removed.

On the other hand, the bottom wall 6A of the heat-insulating box 6 has a rear portion that rises in a step-like manner, and a machine room 56 is formed outside the rear portion of the bottom wall 6A. This machine room 56
Inside, a compressor 57, an evaporating dish condenser 58, and a main condenser 59 constituting a cooling device are installed. In addition, since the bottom wall 6A has such a shape, the bottom of the freezing compartment 18 also has a shape in which the rear rises, so that the rear surface of the lower container 46 is located forward of the rear surface of the upper container 44. Becomes The cooler 38 is located above the raised bottom wall 6A.

On the other hand, a high-temperature refrigerant pipe 61 is alternately attached (attached) to the inner surface of the outer box 2, and a high-temperature refrigerant pipe 62 is also provided on the inner surface of the outer box 2 located at the periphery of the opening of the heat insulating box 6. Have been. The discharge side of the compressor 57 is connected to the evaporating dish condenser 58, and the outlet of the evaporating dish condenser 58 is connected to the main condenser 59. The outlet of the main condenser 59 is connected to the high-temperature refrigerant pipe 61,
Is connected to a high-temperature refrigerant pipe 62 around the opening. The high-temperature refrigerant pipe 62 is connected to the cooler 38 via a capillary tube (not shown), and the outlet of the cooler 38 is connected to the suction side of the compressor 57.

In such a configuration, when the compressor 57 is operated,
A high-temperature and high-pressure gas refrigerant is discharged from the compressor 57, flows into the evaporating dish condenser 58 and the main condenser 59 in order, releases heat, and is condensed. The refrigerant flowing out of the main condenser 59 flows into the high-temperature refrigerant pipe 61 to further radiate heat, and then flows into the high-temperature refrigerant pipe 62 to heat the periphery of the opening. Thereby, dew condensation on the periphery of the opening is eliminated.

The refrigerant flowing out of the high-temperature refrigerant pipe 62 is decompressed by the capillary tube and then enters the cooler 38 and evaporates. At this time, heat is taken from the surroundings, and the air in the cooling chamber 37 is cooled. The refrigerant exiting the cooler 38 is again supplied to the compressor 5
It is sucked into 7.

As described above, the cool air cooled by the cooler 38 is sucked by the operation of the upper blower 39 and blown out to the front distribution duct 47. The cool air blown out to the distribution duct 47 flows from the cool room discharge ports 48 and 49 to the freezer room 18.
Is discharged into each of the containers 44 and 46 and cooled to a freezing temperature of about −20 ° C. The cool air in the freezer compartment 18 returns from the freezer cool air return port 51 into the cooling compartment 37 on the suction side of the cooler 38.

The cool air blown out to the distribution duct 47 also flows into the refrigerator compartment duct 24 from the cool air distribution port 52 and rises there. Then, the cool air is discharged from each of the refrigerator compartment cool air discharge ports 26. It is discharged into the refrigeration room 8 and the ice temperature room 22. A not-shown damper that opens and closes at the temperature in the refrigerator compartment 8 is provided in the refrigerator compartment duct 24, whereby the refrigerator compartment 8 is maintained at a refrigerator temperature of about + 5 ° C. Is maintained at an ice temperature of about 0 ° C. to −3 ° C.

The cool air circulated in each of the chambers 8 and 22 flows into the cold room return port 27 and enters the vegetable room 17 through the vegetable room cool air discharge port 31 and the like, keeping the inside of the vegetable room container 34 cool from the surroundings. Then, the cool air circulated in the vegetable room 17 flows into the cool room / vegetable room cool air return duct 53 from the vegetable room cool air return port 32, flows down there, and returns to the cool room / vegetable room cool air return port 54.
It returns to the cooling chamber 37 on the suction side of the cooler 38.

On the other hand, vacuum heat insulating materials 71 are adhered to the inner surfaces (surfaces on the foam heat insulating material 4 side) of the side plates 2A and 2A of the outer box 2 corresponding to both sides of the freezing room 18, and
The vacuum heat insulating material 72 is also attached to the inner surface of the bottom plate 2 </ b> B (the surface on the side of the foam heat insulating material 4) of the outer box 2 corresponding to the portion below the bottom 8, and is buried in the foam heat insulating material 4. Further, the vacuum heat insulating material 73 is also attached to the inner surface (the surface on the side of the foam heat insulating material 4) of the back plate 2C of the outer box 2 corresponding to the cooling room 37 behind the freezing room 18,
It is embedded in the foam insulation 4.

Each of the vacuum heat insulating materials 71, 72 and 73 is formed by folding a gas barrier film in which a heat-welding layer made of, for example, polyethylene or polypropylene, an aluminum layer (metal layer) and a surface protective layer are laminated from the inside, and two sides are brought into close contact with each other. The heat welding layers are welded to each other to form a bag, and in that state silica, fine powder such as pearlite,
And, after inserting a glass fiber or a core material made of open-cell foamed polyurethane heat insulating material, evacuating the gas inside the bag in a predetermined evacuation device to make a vacuum state, and then performing the heat welding on the remaining one side Manufactured by fusing the layers together and sealing.

Of these, the upper portions of the vacuum heat insulators 71, 71 located on both sides of the freezing compartment 18 are provided with the vegetable compartment 1 as shown in FIG.
7, the lower end edge 71A of the vacuum heat insulating material 71, 71 has an inclined shape in which the rear portion gradually rises at a predetermined angle from the front portion. Thereby, the lower end edge 71A of the vacuum heat insulating material 71 has a shape similar to the shape of the bottom wall 6A, and the vacuum heat insulating materials 71, 71 cover substantially the entire area from the front part to the rear part of the bottom of the freezing chamber 18 avoiding the machine room 56. Will come to cover.

Thus, regardless of the shape of the bottom wall 6A of the heat insulating box 6 formed by the machine room 56, the vacuum heat insulating materials 71, 71 are provided.
Is attached to the bottom of the heat insulation box 6 with a large area, and the heat insulation effect can be improved. In particular, the vacuum heat insulating materials 71 and 7 are provided almost all over the side of the freezing room 18 where heat insulation is most desired.
1 can be provided, so that the wall thickness of the heat insulating box 6 is reduced to further reduce the installation space of the refrigerator 1, or to increase the effective volume, or to further increase the power consumption of the cooling device. Can be reduced.

Further, since the vacuum heat insulating material 71 itself has such a shape, the core material constituting the vacuum heat insulating material 71 has a tapered shape, so that the work of inserting the vacuum heat insulating material 71 into the gas barrier film becomes easy, and the vacuum heat insulating material 71 itself Also improves the assembly workability.

Further, the vacuum heat insulating material 72 located below the freezing compartment 18 is formed in a step shape along the shape of the bottom wall 6A.

On the other hand, the vacuum heat insulating material 73 located behind the freezing compartment 18 has a rectangular shape as a whole. As shown in FIG. 6, the core material has a size larger than the rear projection area of the area including the cooler 38 and the blower 39.

Here, since the core material does not exist in the peripheral portion of the vacuum heat insulating material, and only the gas barrier film is used, the heat transfer on the surface including the peripheral portion of the vacuum heat insulating material increases, and the heat insulating performance is increased. Worsens (this is called a heat bridge).

On the other hand, as described above, the vacuum heat insulating material 73 is used.
If the size of the core material is larger than the rear projection area of the region including the cooler 38 and the blower 39, the temperature is the lowest such as -30 ° C to -35 ° C without being affected by the heat bridge. The heat behind the cooler 38 can be effectively insulated.

In particular, the wall thickness of the heat insulating box 6 is reduced due to the installation of a motor and the like behind the blower 39. However, by installing the vacuum heat insulating material 73, it is possible to prevent the heat insulating performance from lowering. Become like

Each of the above vacuum heat insulating materials 71, 72, 73
10 is gradually inclined outward from the end as shown in the enlarged view of FIG. 10 (the peripheral end thereof is indicated by 71B in FIG. 10).
1, 72, 73, outer box 2 (side plate 2A, bottom plate 2B, back plate 2
The area of the surface on the C) side is smaller than the area of the surface on the inner box 3 side.

Thus, the vacuum heat insulating materials 71, 72, 73
The area where the gas barrier film on the surface contacts the outer box 2 (side plate 2A, bottom plate 2B, back plate 2C) is reduced.

Accordingly, it is possible to reduce the amount of heat that enters the freezing room 18, the vegetable room 17 or the refrigeration room 8 from outside the outer box 2 along the gas barrier films of the vacuum heat insulating materials 71, 72, 73. As a result, it is possible to reduce the adverse effects caused by the heat bridge of the vacuum heat insulating material.
It is assumed that the vacuum heat insulating material 73 has such a size that the area of the surface of the core material on the outer box 2 side is larger than the rear projection area of the region including the cooler 38 and the blower 39.

On the other hand, as shown in FIG. 9, the high-temperature refrigerant pipe 61 is provided on the left side plate 2A of the vacuum heat insulating material 71 on the left side.
The inner surface rises upward from below, bends forward in a crank shape, and then turns upward to extend rightward on the inner surface of the top plate 2D. Then, after turning downward, it is bent rearward in the shape of a crank, and descends on the inner surface of the side plate 2A behind the right vacuum insulating material 71.

The high-temperature refrigerant pipe 61 further rises from the inner surface of the back plate 2C on the side of the vacuum heat insulating material 73, bends in a meandering manner on the inner surface of the back plate 2C located above the vacuum heat insulating material 73, and then re-evacuates. The heat insulating material 73 has a shape that descends to the side.

As described above, since the high-temperature refrigerant pipe 61 is attached to the inner surface of the back plate 2C above the vacuum heat insulating material 73 attached behind the lower cooler 38 as shown in FIGS. Regardless of the presence of 71 or 73, the high-temperature refrigerant pipe 61
, The cooling capacity can be maintained by securing the heat radiation capacity (pipe length).

Next, the procedure for assembling the heat insulating box 6 of the refrigerator 1 as described above will be described. First, the vacuum heat insulators 71, 71, 72, 73 are respectively attached to the respective positions on the inner surface of the outer box 2, and the high-temperature refrigerant pipes 61, 62 are also attached to the inner surface of the outer box 2 at this time. At this time, the back plate 2 of the outer box 2
Urethane injection ports 75, 75 are formed on the left and right sides of the central portion of the C, and the high-temperature refrigerant pipe 61 is attached so as to avoid this.

After assembling the inner box 3 into the outer box 2, it is set in a predetermined foaming jig with the opening facing downward.
Next, a polyurethane undiluted solution is injected from the urethane injection ports 75, 75, and is filled between the two boxes 2, 3.
At this time, the thickness of the vacuum heat insulating materials 71, 71 is 15 m.
m, the thickness of the vacuum heat insulating material 73 is 20 mm, and the heat insulating thickness of the freezer compartment 18 (FIG. 8) of the heat insulating box 6 is 45 mm on the side wall and 40 mm to 50 mm on the back wall.

On the other hand, the refrigerator compartment 8 of the heat insulating box 6 (FIG. 7)
The insulation thickness of the side wall is 33mm, the back wall is 30mm ~ 4mm
Since the thickness is set to 0 mm, the thickness of the foamed heat insulating material 4 obtained by subtracting the thickness of each of the vacuum heat insulating materials 71 and 73 becomes the freezing room 1
The values of the eight portions and the refrigerator compartment 8 are substantially equal or approximate. Therefore, the undiluted polyurethane solution which grows by reaction also turns substantially evenly between the two boxes 2 and 3, and the foamed heat insulating material 4 is almost uniformly filled in each part of the heat insulating box 6.

In the embodiment, the vacuum heat insulating materials 71, 72, 7
3 is inclined, but the invention is not limited to this. A recess or the like is formed on the surface on the side of the outer case 2 to form the outer case 2 of the gas barrier film.
The contact area to the surface may be reduced.

Although the present invention has been described with reference to a home refrigerator in the embodiment, the present invention is not limited to this, and is also applicable to a commercial refrigerator, a freezer, a low-temperature showcase, and the like.

[0050]

As described above in detail, according to the present invention, a foam insulation material is filled between the outer box and the inner box, and a vacuum insulation material is attached to the foam insulation material side of the outer box. , In a heat insulation box of a cooling storage buried in foam insulation,
Since the area of the surface of the vacuum heat insulating material on the outer box side is smaller than the area of the surface of the vacuum heat insulating material on the inner box side, the area where the gas barrier film of the vacuum heat insulating material contacts the outer box is reduced.

As a result, it is possible to reduce the amount of heat that enters the storage from the outside of the outer case through the gas barrier film of the vacuum heat insulating material, and reduces the adverse effects of the heat bridge of the vacuum heat insulating material. The heat insulation performance of the box can be improved, and the cooling capacity of the cooling storage can be improved and the power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a refrigerator to which the present invention is applied.

FIG. 2 is a front view of the refrigerator excluding a door.

FIG. 3 is a vertical sectional side view of the refrigerator.

FIG. 4 is a rear view of the refrigerator.

FIG. 5 is another longitudinal side view of the refrigerator.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a sectional view taken along the line BB of FIG. 6;

FIG. 8 is a sectional view taken along line CC of FIG. 6;

FIG. 9 is a perspective exploded perspective view of the refrigerator.

FIG. 10 is an enlarged sectional view of the heat insulating box of the present invention at the end of the vacuum heat insulating material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Outer box 3 Inner box 4 Foam insulation 6 Heat insulation box 18 Freezer 71, 72, 73 Vacuum insulation

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Todo 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Hidefumi Mogi 2-chome Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A foam heat insulating material is filled between an outer box and an inner box, and a vacuum heat insulator is attached to a surface of the outer box on the foam heat insulator side, and is buried in the foam heat insulator. A heat insulating box for a cooling storage, comprising: a surface area of the vacuum heat insulating material on the outer box side smaller than an area of the inner box side surface.