JP7353284B2 - refrigerator - Google Patents

Description

The present invention relates to a refrigerator equipped with a vacuum heat insulating material inside a heat insulating box.

Generally, a refrigerator is provided with an insulating box covering the outer periphery of a storage space in order to insulate the refrigerator from the surroundings. The heat insulating box body is composed of an outer box, an inner box, and a heat insulating material filled between these. As the heat insulating material, for example, a foamable heat insulating material such as a hard foamed urethane heat insulating material is used.

In recent years, there has been a trend to use vacuum insulation materials with low thermal conductivity in addition to foam insulation materials to strengthen the insulation performance of refrigerators. For example, Patent Document 1 discloses a refrigerator in which a vacuum heat insulating material is bonded to the inner surface of an outer box of a heat insulating box body.

Patent No. 5250080

In order to further improve the insulation performance of the refrigerator, it is desirable to increase the size (area) of the vacuum insulation material. As the vacuum insulation material becomes larger, it becomes difficult to apply it uniformly to the outer box. Therefore, for example, when a vacuum heat insulating material is attached to the back surface of an outer box, a gap may be formed between the back surface and the vacuum heat insulating material.

If such a gap is formed between the back part and the vacuum insulation material, gas such as gas generated during the formation of the foam insulation material will enter between the back part and the vacuum insulation material, causing damage to the insulation box. They tend to remain as gas pockets even when the construction is completed. If such a gas pocket is formed between the outer box and the vacuum insulation material, the unevenness on the surface of the outer box becomes more noticeable, causing a poor appearance of the refrigerator.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a refrigerator that can promote the escape of gas generated in a heat insulating box during and after the formation of a foamed heat insulating material, and can suppress the appearance of the heat insulating box. do.

A refrigerator according to one aspect of the present invention includes a heat insulating box, a vacuum insulating material disposed on a back surface of the heat insulating box, and a release material provided on the back surface and subjected to mold release treatment. It is equipped with a mold part. In this refrigerator, the mold release part extends from at least one end of the back surface to a position overlapping an end of the vacuum heat insulating material.

In the refrigerator according to one aspect of the present invention described above, the release part may be an adhesive tape.

The refrigerator according to one aspect of the present invention described above may further include a heat radiation pipe, and the heat radiation pipe may be fixed to the back surface portion with the adhesive tape.

The refrigerator according to one aspect of the present invention described above may further include a viscoelastic member, and at least a portion of the heat radiation pipe may be sandwiched between the viscoelastic member and the adhesive tape.

In the refrigerator according to one aspect of the present invention described above, the mold release portion may extend from a lower end portion of the back surface portion.

In the refrigerator according to one aspect of the present invention described above, an inlet for insulating material may be provided in the back surface portion, and the mold release portion may extend at least to a position where the inlet is arranged.

In the refrigerator according to one aspect of the present invention, a folded part of the outer wrapping material is provided on one surface of the vacuum insulation material, and the folded part is disposed on a side facing the back surface part. , may be arranged so as to overlap the mold release part.

According to the refrigerator according to one aspect of the present invention, it is possible to promote the escape of gas generated in the heat insulating box during and after the formation of the foamed heat insulating material, and to suppress occurrence of poor appearance of the heat insulating box.

FIG. 1 is a perspective view showing the configuration of the back side of a refrigerator according to an embodiment of the present invention. FIG. 2 is a perspective view showing the internal configuration of the heat insulating box of the refrigerator shown in FIG. 1. FIG. FIG. 3 is a plan view showing the configuration of a back plate of the heat insulating box of the refrigerator according to the first embodiment. FIG. 4 is a perspective view showing the configuration of a lower portion on the inner surface side of the back plate shown in FIG. 3; FIG. 5 is an exploded perspective view showing each component on the inner surface side of the back plate shown in FIG. 4; FIG. 4 is a schematic cross-sectional view showing the configuration of the back plate taken along line AA shown in FIG. 3; FIG. 3 is a schematic diagram showing how the foamed heat insulating material flows into the back surface of the heat insulating box. FIG. 8 is a cross-sectional view schematically showing a stage in the middle of forming a foamed heat insulating material inside the cross-sectional box shown in FIG. 7; 8 is a cross-sectional view schematically showing a state in which a heat insulating layer is formed on the back surface of the cross-sectional box shown in FIG. 7. FIG. FIG. 2 is a cross-sectional view schematically showing a state in which a heat insulating layer is formed on the back surface of a conventional cross-sectional box. FIG. 2 is a schematic diagram showing the configuration of the lower end of the back surface of the heat insulating box of the refrigerator according to the first embodiment. It is a top view which shows the structure of the back plate of the heat insulation box of the refrigerator concerning 2nd Embodiment. FIG. 2 is a plan view showing a vacuum heat insulating material provided inside a heat insulating box of a refrigerator according to an embodiment of the present invention. It is a top view which shows the structure of the back plate of the heat insulation box of the refrigerator concerning 3rd Embodiment.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In the following description, the same parts are given the same reference numerals. Their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated.

<First embodiment>
(Overall configuration of refrigerator)
First, the overall configuration of the refrigerator 1 according to the present embodiment will be described. FIG. 1 shows an external appearance of a refrigerator 1 according to the present embodiment. In FIG. 1, the back side of the refrigerator 1 is mainly shown. FIG. 2 shows the configuration of a heat insulating box 50 that constitutes the refrigerator 1. In FIG. 2, the back plate 58 constituting the back surface portion 51c of the outer box 51 of the heat insulating box 50 is shown removed.

A door (not shown) is provided on one side of the refrigerator 1. In this embodiment, the surface on which the door is provided is the front surface (front surface) of the refrigerator. Then, each surface of the refrigerator 1 is defined as a top surface, a side surface, a back surface, and a bottom surface based on the position that exists when the refrigerator 1 is installed in a normal state with the front surface as a reference.

The refrigerator 1 is provided with a heat insulating box 50 as a heat insulating structure for insulating each storage space from the surroundings. The heat insulating box 50 is provided so as to cover the outer periphery of the refrigerator 1. The heat insulating box 50 mainly includes an outer box 51, an inner box 52, a heat insulating layer (foamed heat insulating material) 53 (see FIG. 9), a vacuum heat insulating material (VIP) 54 (see FIG. 3), and the like.

In this specification, the outer surfaces of the heat insulating box 50 are respectively referred to as a top surface portion 51a, a bottom surface portion 51b, a back surface portion 51c, and a side surface portion 51d, in conjunction with the names of each surface of the refrigerator 1.

Inside the refrigerator 1, a refrigeration cycle (not shown) is provided. A refrigeration cycle is configured by connecting a compressor, a condenser, an expander, a cooler, etc. via a refrigerant pipe (refrigerant flow path) through which refrigerant flows. The compressor is arranged in a machine room 30 provided on the bottom rear side of the refrigerator 1.

(Explanation of insulation box)
Next, a more specific configuration of the heat insulating box 50 will be described with reference to FIGS. 1 to 6, FIG. 9, FIG. 11, and the like.

FIG. 3 is a plan view showing the configuration of the back plate 58 that constitutes the back surface portion 51c of the heat insulating box 50. As shown in FIG. FIG. 3 shows the inner surface side of the back plate 58 (the side on which the heat insulating layer 53 is formed). FIG. 4 is an enlarged view of the lower end of the back plate 58 shown in FIG. 3. FIG. 5 is an exploded view of each component disposed on the inner surface of the back plate 58. As shown in FIG. FIG. 6 is a diagram showing a cross-sectional structure of the back plate 58 taken along line AA shown in FIG. 3. As shown in FIG. FIG. 9 is a sectional view showing the internal configuration of the heat insulating box 50. FIG. 9 is a cross-sectional view of the heat insulating box 50 at a position corresponding to the line BB line shown in FIG. FIG. 11 is a schematic diagram showing the configuration of the lower end portion of the back plate 58 (the boundary portion with the machine room 30).

The heat insulating box 50 mainly includes an outer box 51, an inner box 52, a heat insulating layer 53, and a vacuum insulation material (VIP) 54.

The outer box 51 forms the outer peripheral surface of the heat insulating box body 50. The outer box 51 also partially forms the outer shape of the refrigerator 1. That is, the outer box 51 forms a top surface portion 51a, a back surface portion 51c, and a side surface portion 51d of the heat insulating box body 50. The back surface portion 51c of the outer box 51 is formed of a plate-shaped back plate 58.

The inner box 52 forms the inner peripheral surface of the heat insulating box body 50. Moreover, the inner box 52 partitions each storage space such as a refrigerating room.

A space for arranging the machine room 30 is formed on the back side of the bottom surface of the heat insulating box 50. Equipment such as a compressor is arranged in the machine room 30. A sealing member 75 is provided at the lower end of the back surface 51c of the outer box 51 at the boundary with the machine room 30 (see FIG. 2). The seal member 75 is made of an elastic material having a porous structure, such as sponge. Thereby, the foamed heat insulating material filled inside the heat insulating box 50 can be prevented from leaking into the machine room 30.

The heat insulating layer 53 is mainly composed of foamed heat insulating material. Specifically, the heat insulating layer 53 can be formed of rigid urethane foam (also referred to as rigid polyurethane foam). Rigid foamed urethane is a uniform resin foam obtained by mixing two main raw materials with a catalyst, a blowing agent, a foaming agent, etc., and causing a foaming reaction and a resin-forming reaction at the same time.

Further, the inside of the heat insulating box 50 includes a vacuum heat insulating material 54 in addition to a heat insulating layer 53 made of a foamed heat insulating material. The vacuum insulation material 54 is formed by covering a core material with microscopic voids such as glass wool or silica powder with an outer packaging material (bag-like body, such as a laminate film) having gas barrier properties, and sealing the inside of the outer packaging material under reduced pressure. . Vacuum heat insulating materials can achieve a high heat insulating effect by keeping the internal space at a high vacuum and minimizing the amount of heat transmitted through the gas phase. The vacuum heat insulating material 54 is, for example, a flat member having a rectangular plane.

As shown in FIG. 2, the vacuum heat insulating material 54 is arranged on the back side of the heat insulating box 50. That is, the vacuum heat insulating material 54 is attached to a back plate 58 that constitutes the back surface portion 51c of the outer box 51.

As shown in FIG. 3, the back plate 58 has an upper end 58a and a lower end 58b. Further, side end portions 58c extending in the vertical direction are provided at both left and right end portions of the back plate 58. The left and right side end portions 58c and 58c are slightly inclined with respect to the flat back surface portion 51c (see FIG. 6). A ridge portion 58d is formed between the side end portion 58c and the back surface portion 51c. The adhesive tape 61 is placed on the inner surface of the back plate 58 so as to straddle the ridge 58d (see FIG. 6).

The vacuum heat insulating material 54 is arranged between the ridges 58d on both the left and right sides of the back plate 58. As shown in FIG. 6, at least one end portion of the vacuum heat insulating material 54 is arranged so as to ride on the adhesive tape 61. Foamed heat insulating material injection ports 55 are formed at the left and right side end portions 58c of the back plate 58. A liquid foam insulation material is injected through the injection port 55 . A plurality of injection ports 55 (four in this embodiment) are provided.

A heat radiation pipe 71 extends below the back plate 58 (slightly above the lower end portion 58b) (see FIG. 5). A refrigerant warmed in the refrigeration cycle flows through the heat radiation pipe 71 . By providing such a heat dissipation pipe 71, it is possible to suppress the occurrence of dew condensation on the surface of the heat insulating box 50.

In this embodiment, the heat dissipation pipe 71 extends from the lower end 58b near the left or right side end 58c to the back plate 58, and extends on the back plate 58 in the left-right direction along the lower end of the vacuum insulation material 54. It extends toward the machine room 30 from the lower end 58b near the other side end 58c.

Thus, in this embodiment, the heat radiation pipe 71 is arranged only near the lower end portion 58b of the back plate 58. Thereby, a larger area for arranging the vacuum heat insulating material 54 can be secured on the back surface 51c of the outer box 51. That is, a large area of the vacuum heat insulating material 54 can be placed on the back surface 51c of the outer box 51, and the heat insulating performance of the heat insulating box 50 can be improved.

The heat dissipation pipe 71 is fixed to the back surface portion 51c with a sheet-like adhesive tape 61. The adhesive tape 61 has one surface as an adhesive surface and the other surface as a release surface (release portion). The mold release surface is subjected to mold release treatment. The mold release treatment is performed, for example, by forming a silicone-coated surface on the surface of an adhesive tape made of a metal material such as aluminum. The adhesive force between the mold release surface and the hard urethane foam forming the heat insulating layer 53 and the vacuum heat insulating material 54 is weak. Therefore, when the heat insulating layer 53 is formed, a slight gap can be formed between the hard urethane foam and the mold release surface.

As shown in FIG. 3, the adhesive tape 61 extends upward from the lower end 58b of the back plate 58 onto the ridges 58d on both the left and right sides. Specifically, the upper end 61a of the adhesive tape 61 is located slightly above the upper injection port 55 of the plurality of injection ports 55 formed at the side end 58c of the back plate 58. Further, the lower end 61b of the adhesive tape 61 extends to the lower end 58b of the back plate 58 and reaches the position where the sealing member 75 provided at the boundary with the machine room 30 is disposed.

In addition, each end of the adhesive tape 61 in the width direction (left and right direction) extends to a position where one side overlaps the end (left or right end) of the vacuum insulation material 54, and the other side overlaps the side end. It extends to a position that partially slightly overlaps with the injection port 55 of the portion 58c.

FIG. 4 shows the configuration of the lower right corner portion of the back plate 58 in FIG. 3. As shown in FIG. The heat radiation pipe 71 is bent approximately vertically at a lower corner portion of the back plate 58. The bent portion of the heat dissipation pipe 71 is located so as to roughly correspond to the ridge portion 58d of the back plate 58 (see FIG. 11, etc.). A viscoelastic member 65 is provided between the bent portion of the heat radiation pipe 71 and the back plate 58. The viscoelastic member 65 can be made of a rubber material such as butyl rubber, for example.

A lower end portion 61b of the adhesive tape 61 is arranged at a position corresponding to the viscoelastic member 65 with the heat dissipation pipe 71 in between. In FIG. 4, a portion near the lower end 61b of the adhesive tape 61 is shown by a broken line. Since the viscoelastic member 65 has viscosity, it can fix the heat radiation pipe 71. Further, the surface of the adhesive tape 61 facing the viscoelastic member 65 is an adhesive surface. Therefore, when the adhesive tape 61 is placed on the viscoelastic member 65, the viscoelastic member 65 and the adhesive tape 61 are brought into close contact with each other with the heat radiation pipe 71 sandwiched therebetween.

As a result, the heat dissipation pipe 71 located near the lower end portion 58b of the back plate 58 is covered with the viscoelastic member 65 and the adhesive tape 61, and is in a sealed state. In this way, the viscoelastic member 65 can close the gap that may be formed between the back plate 58, the adhesive tape 61, and the heat radiation pipe 71. Thereby, leakage of the foamed urethane material from inside the heat insulating box 50 can be suppressed.

Further, a lid member 69 covering the injection port 55 is provided at a position corresponding to each injection port 55 (see FIG. 5). The lid member 69 is formed into a sheet shape, and as shown in FIG. 5, only one end is attached so as to open inward. As a result, the nozzle for injecting the foamed urethane material can be inserted from the outside of the insulation box 50, while the structure is such that it becomes a valve and does not open even if it is pushed from the inside of the insulation box 50. It becomes. Therefore, it functions as a lid for suppressing the outflow of the hard urethane foam formed inside the heat insulating box 50 during urethane foaming.

(Method for manufacturing a heat insulating box)
The heat insulating box 50 having the above configuration is manufactured, for example, as follows.

First, the viscoelastic member 65 and the lid member 69 are attached to predetermined positions on the inner surface of the back plate 58. Next, the heat radiation pipe 71 is placed at a predetermined position on the back plate 58. Thereafter, the adhesive tape 61 is attached to a predetermined position on the back plate 58. Thereby, the heat radiation pipe 71 is fixed at a predetermined position on the back plate 58.

Subsequently, the vacuum heat insulating material 54 is attached to the inner surface of the back plate 58 so as to partially overlap the adhesive tape 61. The vacuum insulation material 54 is attached to the back plate 58 using an adhesive such as hot melt.

On the other hand, inside the inner box 52, an internal electrical unit, various types of wiring, etc. are attached. Further, a seal member 75 is attached to the lower end portion 58b of the back plate 58 at a boundary portion with the machine room 30 (see FIG. 2).

Then, each side of the outer box 51 is attached so as to cover the outer periphery of the inner box 52 (see FIG. 2).

Thereafter, with the back surface 51c of the heat insulating box 50 facing up, liquid foam insulation material (urethane foam material) is injected through the injection port 55 formed in the back surface 51c. The foamed heat insulating material is filled in the space between the outer box 51 and the inner box 52 from the front side to the back side while increasing the volume. The foamed insulation is then cured.

Specifically, the foamed urethane material increases in volume while undergoing a foaming reaction, filling the space between the outer box 51 and the inner box 52. At this time, the urethane foam will not be uniformly filled unless the air in the space (and the gas generated during the foaming reaction) is exhausted to the outside of the space. Therefore, the heat insulating box 50 is provided with a gas vent hole. In the heat insulating box 50, the gas vent hole is provided, for example, around the bottom where it is not noticeable. In the example shown in FIG. 7, a gas vent hole 81 is provided in a region surrounded by a broken line circle near the machine room 30.

On the other hand, most of the back surface 51c of the outer box 51 constituting the heat insulating box 50 is covered with the vacuum heat insulating material 54, and there is no gas vent hole. Therefore, the amount of urethane foam material injected from the injection port 55 located on the upper side is set to be larger than the amount of injection from the injection port 55 located on the lower side, and the space on the back side of the heat insulating box 50 is The foamed urethane material flows downward from the injection port 55 located on the upper side, so that the gas vent hole provided at the bottom of the heat insulating box 50 is unlikely to be blocked during filling with foamed urethane material ( (See Figure 7).

Therefore, in the configuration of the conventional heat insulating box 950 shown in FIG. The urethane foam easily sneaks into the gap 900. The urethane foam that has entered the gap 900 foams and generates gas, and the pressure of the gas tends to increase the peeling of the adhesive surface. In particular, if the adhesive force on the surface of the vacuum heat insulating material 54 is non-uniform, such peeling is more likely to occur from locations where the adhesive force is low.

Since the back plate 58 is under stress as shown by the solid arrow in FIG. is deformed in the direction shown by the solid line arrow in FIG. After that, when the heat generated during foaming of the urethane subsides, the temperature of the urethane foam decreases inside the heat insulating box, causing the urethane foam to shrink. At this time, in the conventional heat insulating box 950, the foamed urethane shrinks toward the inside of the refrigerator (in the direction indicated by the dotted arrow in FIG. Since the urethane adheres to the back plate 58 and solidifies, the gas pressurized into the gap 900 is trapped in the gap 900. As a result, the gap 900 does not shrink, and the back plate 58 maintains its deformed state in the direction shown by the solid arrow in FIG.

After that, when the refrigerator is completed, the gas trapped in the gap 900 gradually escapes to the outside, but at that time the back plate 58 has already been subjected to the stress shown by the solid line arrow in FIG. 10 for a long time due to the gas in the gap 900. It continues and will never return to its original form. On the other hand, when the inner box of the refrigerator is operated for cooling, the urethane foam further shrinks toward the inside of the refrigerator, so the gap 900 tends to expand. Such a gap 900 causes unevenness and distortion of the surface of the back surface 51c of the outer box 51, impairing the appearance of the refrigerator. In addition, since the inside of the back section 51c of the outer box 51 is hollow due to the gap 900, the back section 51c is in a so-called floating state, which impairs the quality of the refrigerator.

On the other hand, in the heat insulating box 50 according to the present embodiment, the adhesive tape 61 extends in the vertical direction along the ridge 58d of the back plate 58, and the lower end 61b of the adhesive tape 61 extends along the ridge 58d of the back plate 58. It has reached the lower end 58b of. The adhesive tape 61 and the end of the vacuum heat insulating material 54 partially overlap. As described above, since the surface of the adhesive tape 61 has been subjected to a release treatment, the adhesive tape 61 is separated from the urethane foam (insulating layer 53) and the vacuum heat insulating material 54.

Therefore, at a stage in the middle of forming the urethane foam, a certain amount of the urethane foam material sneaks into the space between the back plate 58 and the vacuum heat insulating material 54 (framed by a broken line in FIG. 8). However, the adhesive tape 61 also extends in the vertical direction and reaches the lower end portion 58b of the back plate 58. Since the surface of the adhesive tape 61 is a release surface, the urethane foam that has penetrated between the back plate 58 and the vacuum heat insulating material 54 will not adhere to the back plate 58. Therefore, even in the middle of forming the urethane foam, a gap is formed between the heat insulating layer 53 and the position of the adhesive tape 61, and this gap communicates with the outside at the sealing member 75 at the lower end 58b of the back plate 58. do. Therefore, the location of the adhesive tape 61 on the lower end 58b of the back plate 58 functions as a gas vent hole 82 (see FIG. 7).

Therefore, the gas generated from the urethane foam that has penetrated between the back plate 58 and the vacuum insulation material 54 is exhausted to the outside through the above-mentioned gap before the adhesive surface between the back plate 58 and the vacuum insulation material 54 is peeled off. Therefore, peeling of the adhesive surface is suppressed. Furthermore, the foamed urethane material injected between the back plate 58 and the vacuum insulation material 54 cannot adhere to and remain on the back plate 58 due to the release treatment on the surface of the adhesive tape 61, Rather than sneaking between the adhesive surfaces with the heat insulating material 54, it spreads preferentially in the downward direction of the heat insulating box 50 along the placement position of the adhesive tape 61.

Therefore, the amount of urethane foam material and gas that sneak into between the back plate 58 and the vacuum heat insulating material 54 can be suppressed as a result. That is, the formation of the gap 900 that is formed in the conventional heat insulating box 950 is suppressed. If a large gap is not formed between the back plate 58 and the vacuum insulation material 54 at the stage when the foamed urethane is almost formed inside the insulation box 50, a gap will be formed between the inner box 52 and the vacuum insulation material 54. The vacuum insulation material is pushed toward the outer box 51 by the internal pressure (foaming pressure) of the foamed urethane (insulation layer 53) (see the arrow in FIG. 9). Therefore, gas intrusion into the adhesive surface between the back plate 58 and the vacuum heat insulating material 54 (that is, separation of the adhesive surface) is suppressed.

As shown in FIG. 11, a sealing member 75 made of an elastic member having a porous structure such as sponge is provided at the lower part of the heat insulating box 50 at the boundary with the machine room 30. Suppresses leakage of urethane foam. The release surface of the adhesive tape 61 affixed to the back plate 58 faces the sealing member 75 . Thereby, the release surface of the adhesive tape 61 inside the heat insulating box 50 communicates with the outside via the seal member 75.

In this way, a region is formed in the back plate 58 in the heat insulating box 50 along the release surface of the adhesive tape 61 where there is no adhesion to the urethane foam forming the heat insulating layer 53. That is, the region where there is no adhesion to the urethane foam extends from the overlapped portion of the adhesive tape 61 and the vacuum heat insulating material 54 to the position where the sealing member 75 is arranged at the lower end portion 58b. This allows the foaming gas released from the urethane foam that has sneaked between the vacuum insulation material 54 and the back plate 58 to be released from the stage where the urethane foam is being formed until the stage where the urethane foam is almost formed. Can be degassed. Therefore, gas accumulation is less likely to be formed between the vacuum heat insulating material 54 and the back plate 58, and separation of the adhesive surfaces between the back plate 58 and the vacuum heat insulating material 54 can be suppressed.

In this embodiment, the gap between the heat radiation pipe 71 fixed with the adhesive tape 61 and the back plate 58 is closed using the viscoelastic member 65 having a rectangular flat plate structure. As this viscoelastic member 65, it is preferable to use a rubber material such as butyl rubber. The rubber material is heated and softened by an exothermic reaction during the formation of urethane foam. As a result, the viscoelastic member 65 enters the gap while appropriately contacting the seal member 75 with the adhesive tape 61 sandwiched therebetween, and occupies the space within the heat insulating box 50.

(Summary of the first embodiment)
As described above, the refrigerator 1 according to the present embodiment includes the heat insulating box body 50. A vacuum heat insulating material 54 is disposed on the back plate 58 (ie, the back surface portion 51c) that constitutes the outer box 51 of the heat insulating box 50. Further, on the surface of the back plate 58, an adhesive tape 61 having a release surface is pasted at a predetermined position.

The adhesive tape 61 extends from at least one end of the back surface portion to a position overlapping either end of the vacuum heat insulating material 54 . In this embodiment, the adhesive tape 61 extends from the lower end 58b of the back plate 58 to slightly above the position where the injection port 55 is arranged. Each end of the adhesive tape 61 in the width direction (left and right direction) extends to a position where one side overlaps the end (either the left or right end) of the vacuum heat insulating material 54.

According to this configuration, gas generated or flowing within the gap formed between the vacuum heat insulating material 54 and the back plate 58 is transmitted along the release surface of the adhesive tape 61 to the machine room 30 below the back plate 58. It is possible to form a communication path to the side.

Thereby, in the middle of forming urethane foam inside the heat insulating box 50, the pressure of the gas entering between the back plate 58 and the vacuum heat insulating material 54 can be reduced. At the stage where the foamed urethane is almost formed, the side of the vacuum insulation material 54 facing the insulation layer 53 is pushed by the foaming pressure of the insulation layer 53 and enters between the back plate 58 and the vacuum insulation material 54. The gas can be discharged through the above-mentioned communication path. Therefore, the gas can be discharged before the back plate 58 is plastically deformed by the pressure of the gas.

In this way, according to the configuration of this embodiment, it is possible to promote the release of gas generated in the heat insulating box 50 during and after forming the foam heat insulating material. In addition, deformation of the back plate 58, which can occur when urethane foam shrinks during the manufacturing process of the heat insulating box 50, is less likely to occur. Thereby, occurrence of appearance defects of the heat insulating box 50 can be suppressed.

In the present embodiment, a configuration in which the adhesive tape 61 extends to the lower end 58b of the back plate 58 has been described as an example. However, in another aspect of the present invention, the adhesive tape 61 may be attached so as to extend to an end portion of the back plate 58 other than the lower end portion 58b. For example, when the vacuum insulation material 54 is placed on the back plate 58, the adhesive tape 61 may be placed at the end of the back plate 58 where the distance from the end of the vacuum insulation material 54 is the shortest.

That is, one arbitrary end of the adhesive tape 61 is located at one end of the back plate 58, and the other end of the adhesive tape 61 extends at least to a position overlapping either end of the vacuum insulation material 54. All you have to do is stay there.

In addition, in this embodiment, the refrigerator in which the heat dissipation pipe 71 is attached to the back plate 58 was cited as an example. However, even in the case of a configuration in which the back plate 58 is not provided with a heat dissipation pipe, it is preferable to arrange the adhesive tape 61 at the same position as in this embodiment.

Further, in this embodiment, the adhesive tape 61 plays the role of the mold release part, but in another embodiment, the mold release part can be realized in a form other than the adhesive tape. For example, the mold release portion can also be formed by applying a fluorine-based mold release agent to the surface of the back plate 58.

<Second embodiment>
Next, a second embodiment of the present invention will be described. In the second embodiment, the arrangement position of the heat radiation pipe on the back plate is different from that in the first embodiment. For other configurations, the same configuration as in the first embodiment can be applied. Therefore, in the second embodiment, the points different from the first embodiment will be mainly described.

FIG. 12 shows the inner surface of the back plate 58 that constitutes the outer box 151 of the heat insulating box 50 according to the second embodiment. As for the configuration of the back plate 58, the same configuration as in the first embodiment can be applied.

As shown in FIG. 12, a vacuum insulation material (VIP) 54 is attached to the inner surface of the back plate 58. Inlet ports 55 for insulating material are formed near the left and right ends of the back plate 58 . These configurations are similar to those in the first embodiment.

Further, a heat dissipation pipe 171 extends around the outer periphery of the vacuum heat insulating material 54 (specifically, the upper end and both left and right ends). By providing such a heat dissipation pipe 171, it is possible to suppress the occurrence of dew condensation on the surface of the heat insulating box 50.

The heat radiation pipe 171 is fixed to the back plate 58 with sheet-shaped adhesive tapes 161 and 162. As in the first embodiment, one surface of the adhesive tapes 161 and 162 is an adhesive surface, and the other surface is a release surface (release portion).

In this embodiment, a portion 171a of the heat dissipation pipe 171 extending along the upper end 58a of the back plate 58 is fixed with a relatively wide adhesive tape 162. Furthermore, a portion 171b of the heat dissipation pipe 171 extending along both left and right ends of the back plate 58 is fixed with a relatively narrow adhesive tape 161.

The adhesive tape 161 extends in the vertical direction along the ridge 58d of the back plate 58. The upper end 161a of the adhesive tape 161 extends to a position where it overlaps the lower end 162b of the adhesive tape 162. Further, the lower end 161b of the adhesive tape 161 reaches the lower end 58b of the back plate 58. Further, the upper end 261a of the adhesive tape 162 reaches the upper end 58a of the back plate 58.

Further, a portion of the adhesive tapes 161 and 162 is arranged so as to overlap with either end of the vacuum heat insulating material 54.

According to the configuration of this embodiment, the space between the vacuum heat insulating material 54 and the back plate 58 is It can communicate with the outside of the refrigerator. Thereby, the pressure of the gas entering between the back plate 58 and the vacuum heat insulating material 54 can be reduced during the process of forming the urethane foam. At the stage where the foamed urethane is almost formed, the side of the vacuum insulation material 54 facing the insulation layer 53 is pushed by the foaming pressure of the insulation layer 53 and enters between the back plate 58 and the vacuum insulation material 54. The gas can be discharged through the communication space formed by the gap.

In this way, according to the configuration of this embodiment, it is possible to promote the release of gas generated in the heat insulating box 50 during and after forming the foam heat insulating material. In addition, deformation of the back plate 58, which may occur when the vacuum heat insulating material 54 contracts during the manufacturing process of the heat insulating box 50, etc., is less likely to occur. Thereby, occurrence of appearance defects of the heat insulating box 50 can be suppressed. Therefore, the gas can be discharged before the back plate 58 is plastically deformed by the pressure of the gas.

<Third embodiment>
Next, a third embodiment of the present invention will be described. In the third embodiment, a more specific configuration of the vacuum heat insulating material and how to arrange it on the back surface will be described.

FIG. 13 shows the appearance of the vacuum insulation material (VIP) 54. The configuration of the vacuum heat insulating material 54 described below can also be applied to the vacuum heat insulating material 54 of the first and second embodiments. FIG. 14 shows the inner surface of the back plate 58 that constitutes the outer box 251 of the heat insulating box 50 according to the third embodiment. As for the configuration of the back plate 58, the same configuration as in the first embodiment can be applied.

The vacuum insulation material 54 is formed by covering a core material with microscopic voids such as glass wool or silica powder with an outer packaging material (bag-like body, such as a laminate film) having gas barrier properties, and sealing the inside of the outer packaging material under reduced pressure. . The vacuum heat insulating material 54 can achieve a high heat insulating effect by keeping its internal space at a high vacuum and minimizing the amount of heat transmitted through the gas phase. As for the material constituting the vacuum heat insulating material 54, conventionally known materials can be used.

As shown in FIG. 13, the vacuum heat insulating material 54 disposed on the back surface 51c of the outer box 251 has a rectangular plate shape. The outer packaging material is made of metal foil laminated with resin to ensure gas barrier properties. Then, as shown in FIG. 13, the four ends of the outer wrapping material are each folded toward one surface 41 (the surface on the near side in FIG. 13). The folded portions become folded portions 43a and 43b.

As a result, in the vacuum heat insulating material 54, the four ends of the outer packaging material are folded, so that the flow of the urethane foam material can be prevented from being inhibited by the ends of the outer packaging material.

The surface of the vacuum heat insulating material 54 on which the folded parts 43a and 43b are provided is arranged on the side facing the back plate 58. Further, in the vacuum heat insulating material 54, the dimensions of the outer wrapping material and the arrangement position of the core material are determined so that the folding width of the folded portion 43a that is folded last is the largest.

As shown in FIG. 14, the vacuum heat insulating material 54 is arranged with respect to the back plate 58 such that the widest folded portion 43a is located on the lower end 58b side of the back plate 58. Therefore, as shown in FIG. 14, the vacuum heat insulating material 54 has one surface 41 where the folded parts 43a and 43b are located on the outer box 251 side (that is, the side facing the back plate 58), and each folded part The other surface 42 where 43a and 43b are not present is arranged on the inner surface side of the heat insulating box 50 (ie, the side on which the heat insulating layer 53 is formed). In addition, in FIG. 14, for convenience of explanation, the arrangement position of the folded portion 43a existing on the back surface (that is, one surface 41) side is shown with diagonal lines.

By arranging the vacuum heat insulating material 54 with respect to the back plate 58 in this way, it is possible to prevent the folded portions 43a and 43b from protruding toward the inner surface of the heat insulating box 50, and the vacuum heat insulating material 54 It is possible to suppress the flow of the urethane foam material from being inhibited on the inner surface of the urethane foam material.

Further, as shown in FIG. 14, an adhesive tape 261 is attached to a predetermined position of the back plate 58. Specifically, the adhesive tape 261 extends in the vertical direction along the ridge 58d of the back plate 58. The upper end portion 261a of the adhesive tape 261 extends slightly above the lower injection port 55. The lower end 261b of the adhesive tape 261 reaches the lower end 58b of the back plate 58. As in the first embodiment, one surface of the adhesive tape 261 is an adhesive surface, and the other surface is a release surface (release portion).

Similar to the first embodiment, a heat radiation pipe 71 is arranged near the lower end 58b of the back plate 58. The heat radiation pipe 71 is fixed to the back plate 58 with an adhesive tape 261.

Further, a portion of the adhesive tape 261 is arranged so as to overlap the end portion of the vacuum heat insulating material 54. Furthermore, in this embodiment, the adhesive tape 261 is arranged so as to overlap the entire area of the left and right end portions 44 and 44 of the folded portion 43a of the vacuum heat insulating material 54.

At both left and right end portions 44 and 44 of the folded portion 43a of the vacuum heat insulating material 54, a space formed between the folded portion 43a and the main body portion of the vacuum heat insulating material 54 may open. Gas generated during the reaction of the foamed urethane material enters the space through this opening, and then, when the foamed urethane closes this opening, the gas accumulated in the space is trapped, and as in the first embodiment, This causes the back plate 58 to deform.

According to the configuration of the back plate 58 according to the present embodiment, the release surface of the adhesive tape 261 is arranged so as to overlap the entire area of the left and right end portions 44 and 44 of the folded portion 43a of the vacuum insulation material 54. There is. Therefore, in the step of forming the urethane foam, it is possible to prevent the opening formed in the folded portion 43a from being blocked by the urethane foam. Therefore, the space formed between the folded part 43a of the vacuum insulation material 54 and the main body portion of the vacuum insulation material 54 is connected to the space formed between the folded part 43a of the vacuum insulation material 54 and the main body part of the vacuum insulation material 54 via the gap formed between the release surface of the adhesive tape 261 and the insulation layer 53. , can be communicated with the outside of the refrigerator. This makes it possible to reduce the pressure of gas entering the space formed between the folded portion 43a of the vacuum insulation material 54 and the main body portion of the vacuum insulation material 54 during the formation of the urethane foam. Further, at the stage where the foamed urethane is almost formed, the other surface 42 side of the vacuum insulation material 54 is pressed by the foaming pressure of the insulation layer 53, so that the folded portion 43a of the vacuum insulation material 54 and the main body of the vacuum insulation material 54 are pressed. Gas that has entered the space formed between the parts can be discharged.

As described above, the possibility that a large amount of gas remains between the back plate 58 and the vacuum heat insulating material 54 after the formation of the heat insulating layer 53 is reduced, so that the back surface of the outer box 251 that causes a poor appearance of the refrigerator 1 is reduced. Deformation and distortion of 51c can be suppressed.

In addition, the vacuum heat insulating material 54 may have a structure in which the outer wrapping material on one side 41 is a metal foil layer film, and the outer wrapping material on the other surface 42 side is a metal vapor-deposited layer film. The metal foil layer film is formed by laminating metal foil with resin. The metal vapor deposited layer film is formed by laminating a metal vapor deposited film thinner than metal foil with resin.

The other surface 42 formed of the metal vapor-deposited layer film is located on the inner surface side of the heat insulating box 50 (that is, the side on which the heat insulating layer 53 is formed), and the other surface 42 formed of the metal vapor-deposited layer film is located on the outer box 251 side (that is, the side on which the back plate 58 is formed). One surface 41 formed of a metal foil layer film is located on the side facing the metal foil layer film. As a result, the inner surface of the heat insulating box 50 becomes a surface completely covered with the metal vapor deposited layer film 42, and the back plate 58 side becomes a surface covered with the metal foil layer film 41 (the area surrounded by the dashed line in FIG. 13). ) exists, and the region of the metal vapor deposited layer film 42 exists around it.

With this arrangement, the metal vapor deposited layer, which is thinner and has lower thermal conductivity than the metal foil layer, faces the heat insulating layer 53, so that the surface of the vacuum heat insulating material 54 and the back plate 58 formed by the metal layer of the outer packaging material are Heat bridges between the two can be suppressed. Moreover, by arranging a metal foil layer that is thicker and has excellent gas barrier properties to face the back plate 58, it is possible to more effectively prevent air from entering the vacuum heat insulating material 54 from the side of the back plate 58 that is exposed to the outside air.

The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and scope equivalent to the claims are included. Furthermore, configurations obtained by combining configurations of different embodiments described in this specification are also included in the scope of the present invention.

1 : Refrigerator 30 : Machine room 43a : Folded part (of outer packaging material) 50 : Heat insulation box 51 : Outer box 51c : Back part 52 (of outer box) : Inner box 53 : Heat insulation layer 54 : Vacuum insulation material 55 : Note Entrance 58: Back plate (rear part)
58b: Lower end (of back plate) 61: Adhesive tape (release part)
65: Viscoelastic member 71: Heat radiation pipe 75: Seal member 151: Outer box 161: Adhesive tape (mold release part)
162: Adhesive tape (release part)
171: Heat dissipation pipe 251: Outer box 261: Adhesive tape (mold release part)

Claims (7)

an insulated box,
a foam insulation material provided in the insulation box;
a vacuum heat insulating material disposed on the back side of the heat insulating box ;
a mold release part provided on the back surface, the surface of which is subjected to mold release treatment for the foamed heat insulating material ;
The mold release part extends from at least one end of the back part to a position overlapping an end of the vacuum insulation material ,
The refrigerator , wherein the mold release part disposed at one end of the back part communicates with outside air . The refrigerator according to claim 1, wherein the mold release part is an adhesive tape. Also equipped with a heat dissipation pipe,
The heat dissipation pipe is fixed to the back surface part with the adhesive tape.
The refrigerator according to claim 2. further comprising a viscoelastic member;
The refrigerator according to claim 3, wherein at least a portion of the heat radiation pipe is sandwiched between the viscoelastic member and the adhesive tape. The refrigerator according to any one of claims 1 to 4, wherein the mold release part extends from a lower end of the back surface part. The back part is provided with an inlet for insulating material,
The refrigerator according to any one of claims 1 to 5, wherein the mold release part extends at least to a position where the injection port is arranged. A folded portion of the outer packaging material is provided on one surface of the vacuum insulation material,
The folded part is disposed on a side facing the back part and is folded back from one end side of the back part, and an end of the folded part overlaps the mold release part. The refrigerator according to any one of claims 1 to 6, wherein the refrigerator is arranged as follows.

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