Heat insulating door and refrigerator comprising the same

Abstract

To prevent condensation on a front plate in a portion corresponding to an outer peripheral edge of a vacuum heat insulating material caused by transfer of cold from a storage chamber.SOLUTION: A heat insulating door (5a) according to the present invention comprises: a front plate (10); a vacuum heat insulating material (30) provided adjacently to a rear surface of the front plate (10); and a heat transfer member (40) provided on the rear surface of the front plate (10) along an outer peripheral edge (31) of the vacuum heat insulating material (30), and having higher thermal conductivity than that of the front plate (10).SELECTED DRAWING: Figure 3A

Description

[Technical field]

[0001] The present invention relates to a heat-insulating door and a refrigerator equipped with the same. [Background technology]

[0002] Conventionally, a known insulated refrigerator door has a good thermal conductor that extends from the rear surface of the front member (front panel) to the inner wall of the cap member (door frame) and transfers heat inside the room (see, for example, Patent Document 1). With such an insulated door, it is possible to prevent condensation on the cap member caused by the transfer of cold heat from the storage compartment on the outer periphery side of the vacuum insulation material arranged behind the front member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6625466 Summary of the Invention [Problem to be solved by the invention]

[0004] The insulated door may have a structure in which a vacuum insulation material is attached to the inner wall (rear surface) of the front member. However, the front member of this insulated door may cause condensation on the part corresponding to the outer periphery of the vacuum insulation material due to cold heat transmitted from the storage chamber. [Means for solving the problem]

[0005] The insulated door of the present invention is characterized by comprising a front panel, a vacuum insulation material arranged adjacent to the rear surface of the front panel, and a heat transfer member arranged on the rear surface of the front panel along the outer peripheral edge of the vacuum insulation material and having a higher thermal conductivity than the front panel. The refrigerator of the present invention is characterized by having the above-mentioned heat-insulating door. [Brief description of the drawings]

[0006] [Figure 1]1 is an overall perspective view of a refrigerator according to a first embodiment of the present invention; [Diagram 2] FIG. 1 is an exploded perspective view of a heat-insulating door according to a first embodiment of the present invention. [Figure 3A] FIG. 2 is a cross-sectional view taken along line IIIA-IIIA of FIG. [Figure 3B] FIG. 3 is a cross-sectional view taken along line IIIB-IIIB of FIG. [Figure 4] FIG. 6 is an exploded perspective view of a heat-insulating door according to a second embodiment of the present invention. [Diagram 5] FIG. 11 is a partially enlarged cross-sectional view of an insulating door according to a third embodiment of the present invention. [Figure 6] 1 is a graph showing verification results of the effects of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description will be given of an embodiment of a heat-insulating door and a refrigerator including the heat-insulating door of the present invention with reference to the accompanying drawings. (First embodiment) First, the overall configuration of the refrigerator of this embodiment will be described, and then the heat-insulating door will be specifically described. In the following description, the front-rear, back-up, back-up, back-left and right directions are based on the front-rear, back-up, back-up, back-left and right directions indicated by the arrows in FIG.

[0008] <Refrigerator> FIG. 1 is an overall perspective view of a refrigerator 1. FIG. As shown in FIG. 1, refrigerator 1 includes, from the top, a refrigeration compartment 2, an ice-making compartment 3, an upper freezer compartment 4, a lower freezer compartment 5, and a vegetable compartment 6. The insulated doors 2a and 2b for opening and closing the refrigerator compartment 2 are pivotal doors that pivot about a hinge 7. In this embodiment, the insulated doors 2a and 2b of the refrigerator compartment 2 are assumed to be double doors (French doors). However, the insulated doors 2a and 2b may also be single doors. The insulated door 3a that opens and closes the ice-making compartment 3, the insulated door 4a that opens and closes the upper freezer compartment 4, the insulated door 5a that opens and closes the lower freezer compartment 5, and the insulated door 6a that opens and closes the vegetable compartment 6 are all drawer-type doors.

[0009] Although not shown, the insulated box 9 of the refrigerator 1 includes an outer box made of steel plate and an inner box made of resin. The outer box and the inner box are arranged with a predetermined gap between them. A foam insulation material such as rigid urethane foam or a vacuum insulation material using glass wool or the like is provided in the inner space of the insulated box 9 formed by the outer box and the inner box.

[0010] <Thermal insulation door> Next, the insulating doors of this embodiment will be described by taking the drawer-type insulating door 5a as an example among the insulating doors 2a, 2b, 3a, 4a, 5a, and 6a of the refrigerator 1 shown in FIG. Fig. 2 is an exploded perspective view of the heat-insulating door 5a. Fig. 3A is a cross-sectional view taken along line IIIA-IIIA in Fig. 1. Fig. 3B is a cross-sectional view taken along line IIIB-IIIB in Fig. 1. In Fig. 3B, reference symbols P0 to P5 are also written to indicate the positions at which temperatures are measured in the examples described below.

[0011] As shown in Fig. 2, the insulating door 5a of this embodiment includes a front panel 10, a rear panel 60, a door frame 20, a vacuum insulation material 30, and a heat transfer member 40. In Fig. 2, the heat transfer member 40 is represented by being shaded for convenience of drawing. Although not shown in FIG. 2, the insulating door 5a is provided with foam insulating material 50 (see FIG. 3A) that embeds the vacuum insulating material 30 between the front panel 10 and the rear panel 60, as will be described in detail later.

[0012] <Front panel> The front plate 10 is also called an outer plate, and as shown in FIG. 3A, is a plate member having a rectangular planar shape that is provided so as to form the front surface of the insulating door 5a. In this embodiment, the front panel 10 is assumed to be made of glass, however, the material of the front panel 10 is not limited thereto as long as it does not deviate from the object of the present invention.

[0013] Although not shown, the front panel 10 has a shatterproof film on the rear side. This shatterproof film can be, for example, a film made of a thermoplastic resin such as polyethylene terephthalate, but is not limited to this. The rear side of the shatterproof film can be printed. With such a heat-insulating door 5a, the design of the heat-insulating door 5a can be improved by the printing that can be seen through the glass and the shatterproof film.

[0014] <Rear plate> The rear plate 60 is also called an inner plate, and is disposed behind the front plate 10 with a predetermined gap therebetween so as to face the front plate 10, as shown in Fig. 3A. The rear plate 60 has a heat insulating portion 8 between it and the front plate 10. In the heat insulating portion 8, vacuum heat insulating material 30 is embedded with foam heat insulating material 50.

[0015] The rear plate 60 is formed by injection molding a thermoplastic resin such as polypropylene. As shown in Fig. 3B, a packing 61 (sealing member) is provided continuously in the circumferential direction on the peripheral edge of the rear surface of the rear plate 60. The packing 61 comes into contact with the periphery of the opening of the lower freezer compartment 5 and elastically deforms when the lower freezer compartment 5 shown in Fig. 1 is closed by the heat-insulating door 5a. In this way, the packing 61 seals the front opening of the lower freezer compartment 5. In FIG. 3A, reference numeral 61a denotes a mounting groove for the packing 61 (see FIG. 2).

[0016] <Door frame> 2, the door frame 20 includes a frame member 21, a frame member 22, a frame member 23, and a frame member 24. These frame members 21, 22, 23, and 24 are arranged to surround a heat insulating section 8 (see FIG. 3A) formed between the front panel 10 and the rear panel 60. As shown in Fig. 3B, a recess 23a that opens upward is formed in the frame member 23 that constitutes the upper part of the door frame 20. As shown in Fig. 2, this recess 23a forms a groove that extends in the left-right direction of the frame member 23. This recess 23a serves as a handle H on which a user places his or her fingers when opening or closing the insulated door 5a.

[0017] In this embodiment, the recess 23a is formed to a depth sufficient to overlap the packing 61 in the front-rear direction when viewed from the direction indicated by the outline arrow in Fig. 3B. This allows the user to adequately place his / her fingers on the recess 23a, making it easy to pull out the insulating door 5a. The recess 23a is not limited to be formed in the frame member 23, but may be provided in the other frame members 21, 22, and 24 (see FIG. 2).

[0018] The material of the door frame 20 is preferably a resin that has good adhesion to the foam insulation material 50 (see FIG. 3A) filled between the front panel 10 and the rear panel 60. Therefore, when the foam insulation material 50 is a hard urethane foam (urethane resin), the material of the door frame 20 that can be suitably used is, for example, ABS (Acrylonitrile-Butadiene-Styrene) resin.

[0019] <Vacuum insulation material> 2, the vacuum insulation material 30 has a generally rectangular parallelepiped shape that is thin in the front-rear direction. In addition, the outer shape may be cut out in order to avoid interference with other components. Although not shown in the drawings, the vacuum insulation material 30 in this embodiment is formed by drawing a vacuum on an exterior material having a core material inside. Examples of the core material include, but are not limited to, hollow powder of silica beads, synthetic resin fibers, glass wool, etc.

[0020] The exterior material may be, for example, a flexible sheet in which a heat-sealing layer and a gas barrier layer are laminated in this order from the core material side. The heat-sealing layer may be made of a thermoplastic resin or the like. The gas barrier layer is preferably a resin sheet having a metal vapor deposition film of 0.1 μm or less formed on one side thereof.

[0021] 2, the vacuum insulation material 30 in this embodiment is assumed to be attached to approximately the center of the rear surface of the front panel 10, excluding the portion where the heat transfer member 40 described below is interposed. However, the vacuum insulation material 30 is not limited to being attached, as long as it is disposed adjacent to the rear surface of the front panel 10 and is thermally connected to the front panel 10. The distance between the peripheral end surface 32 of the vacuum insulation material 30 shown in FIG. 3A and the inner wall 20a of the door frame 20 is preferably 10 mm or more, and more preferably 30 mm or more.

[0022] <Heat transfer materials> As shown in FIG. 2, the heat transfer member 40 is in the form of a tape having a predetermined width and is interposed between the front panel 10 and the vacuum insulation material 30 . The heat transfer member 40 is made of a good thermal conductor having a higher thermal conductivity than the front plate 10 . Such a heat transfer member 40 is provided on the rear surface of the front plate 10 so as to follow the outer peripheral edge 31 of the vacuum insulation material 30. Specifically, the heat transfer member 40 is provided so as to follow the outer peripheral edge 31 consisting of the four sides of the vacuum insulation material 30, and is formed in a rectangular frame shape in a plan view. Such a heat transfer member 40 may also be a rectangular frame-shaped sheet.

[0023] 2, the heat transfer member 40 in this embodiment is entirely contained within the forward projection plane of the vacuum insulation material 30 on the rear surface of the front panel 10. Specifically, the outer contour of the frame-shaped heat transfer member 40 and the contour of the vacuum insulation material 30 formed by the outer peripheral edge 31 of the vacuum insulation material 30 in a plan view overlap in the front-to-rear direction.

[0024] In this embodiment, the heat transfer member 40 is assumed to be an aluminum foil having a thickness of 5.0 μm or more. However, the heat transfer member 40 is not limited to this as long as it has a higher thermal conductivity than the front plate 10, and other metal foils such as copper foil can also be used. Moreover, the heat transfer member 40 in this embodiment is assumed to have an adhesive layer (not shown). As a result, the heat transfer member 40 adheres the front panel 10 and the vacuum insulation material 30 to each other at their peripheries. However, it is sufficient that the heat transfer member 40 adheres to the front panel 10 when the vacuum insulation material 30 is embedded in the foam insulation material 50. Therefore, the heat transfer member 40 may be configured without the adhesive layer.

[0025] <Foam insulation material> 3A, the foam insulation material 50 in this embodiment is filled inside the assembly As of the front panel 10, the rear panel 60, and the door frame 20. The foam insulation material 50 has vacuum insulation material 30 embedded in the rear side of the front panel 10. The foamed insulation material 50 in this embodiment is formed by injecting a concentrate into the assembly As, foaming, and then hardening.

[0026] The foam insulation material 50 is fixed to the front panel 10 from behind the vacuum insulation material 30 and from the upper, lower, left and right sides, the vacuum insulation material 30 having a superior insulating performance to the foam insulation material 50. Additionally, the foam insulation material 50 joins the front panel 10, the rear panel 60 and the door frame 20 to one another from the inside of the assembly As.

[0027] The foam insulation material 50 in this embodiment has a density of 20 to 80 kg / m after hardening. 3 This type of rigid urethane foam is excellent in adhesive performance to the front panel 10, the rear panel 60, and the door frame 20. However, the foam insulation material 50 is not limited to this.

[0028] <Action and effect> Next, the effects of the heat-insulating door 5a according to this embodiment and the refrigerator 1 equipped with the same will be described. The insulated door 5a of the present embodiment includes a front panel 10, a vacuum insulation material 30 provided adjacent to the rear surface of the front panel 10, and a heat transfer member 40 provided on the rear surface of the front panel 10 along an outer periphery 31 of the vacuum insulation material 30 and having a higher thermal conductivity than the front panel 10. The refrigerator 1 of the present embodiment includes such an insulated door 5a.

[0029] Unlike the insulated door 5a of the present embodiment shown in Figure 3A, if we consider an insulated door (comparative example) in Figure 3A that does not have a heat transfer member 40, condensation may form on the front panel 10 of this insulated door (comparative example) in the portion corresponding to the outer peripheral edge 31 of the vacuum insulation material 30 due to the cold transferred from the lower freezer compartment 5 (see Figure 1) through the foam insulation material 50.

[0030] In contrast, in the insulated door 5a of this embodiment, the heat transfer member 40 shown in Fig. 3A transfers the heat of the front panel 10, which has become equal to the indoor air temperature, to the vicinity of the outer periphery 31 of the vacuum insulation material 30. Unlike the above-mentioned insulated door (comparative example), the front panel 10 in the vicinity of the outer periphery 31 of the vacuum insulation material 30 can be set to a temperature higher than the dew point temperature. According to this embodiment, condensation on the front panel 10 in the portion corresponding to the outer peripheral edge 31 of the vacuum insulation material 30 can be prevented.

[0031] In such a thermally insulated door 5a, the vacuum insulation material 30 is embedded in the foam insulation material 50 on the rear side of the front panel 10. The entire heat transfer member 40 is contained within the forward projection plane of the vacuum insulation material 30 on the rear surface of the front panel 10.

[0032] The heat transfer member 40 of this insulating door 5a fits within the forward projection plane of the vacuum insulation material 30 and does not come into surface contact with the foam insulation material 50 that is filled in. This eliminates the need to consider the adhesiveness of the heat transfer member 40 to the foam insulation material 50, improving the freedom of selection of the material for the heat transfer member 40. Furthermore, even if the heat transfer member 40 of this insulating door 5a does not have self-supporting properties, it can be configured to be integrated with the vacuum insulation material 30 in advance by, for example, attaching it to the vacuum insulation material 30. This makes it easier to handle the heat transfer member 40 when it is interposed between the front panel 10 and the vacuum insulation material 30.

[0033] In addition, in such a thermally insulated door 5a, the distance between the inner wall 20a on the thermal insulation section 8 side of the door frame 20 and the peripheral end face 32 of the vacuum insulation material 30 opposing this inner wall 20a is preferably 10 mm or more. By separating the vacuum insulation material 30 from the door frame 20 by a predetermined distance in this way, the concentrate of the foam insulation material 50 flows well to every corner when the vacuum insulation material 30 is embedded in the rear side of the front panel 10 with the foam insulation material 50. In addition, the bonding area between the foam insulation material 50 and the front panel 10 is secured, allowing the front panel 10 to be firmly joined.

[0034] Furthermore, by separating the vacuum insulation material 30 and the door frame 20 by a predetermined distance, the insulated door 5a more reliably prevents the peripheral end surface 32 of the vacuum insulation material 30 from interfering with the inner wall 20a of the door frame 20. This more reliably prevents the exterior material of the vacuum insulation material 30 from coming into contact with the door frame 20 and being damaged when, for example, the vacuum insulation material 30 is disposed on the rear side of the front panel 10.

[0035] On the other hand, in the insulated door 5a, the peripheral end surface 32 of the vacuum insulation material 30 is spaced apart from the inner wall 20a of the door frame 20, compared to a conventional insulated door (for example, see Patent Document 1). This may result in the insulated door 5a of this embodiment having less heat transfer to the outer periphery 31 of the vacuum insulation material 30 via the door frame 20 than in the conventional door. However, the insulated door 5a can more reliably prevent condensation on the front panel 10 in the portion corresponding to the outer peripheral edge 31 of the vacuum insulation material 30 by transferring heat to the outer peripheral edge 31 of the vacuum insulation material 30 via the heat transfer member 40.

[0036] In such a heat-insulating door 5a, the heat transfer member 40 is preferably a tape made of aluminum foil having a thickness of 5 μm or more. According to this heat-insulating door 5 a, the heat of the front panel 10 , which has become equal to the air temperature inside the room, can be efficiently conducted to the vicinity of the outer periphery 31 of the vacuum insulation material 30 .

[0037] Second embodiment Next, a heat-insulating door according to a second embodiment will be described. In the following, the same components as those in the heat-insulating door 5a (see FIG. 2) of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0038] FIG. 4 is an exploded perspective view of a heat-insulating door 5b according to the second embodiment. As shown in FIG. 4, a heat transfer member 41 of a heat-insulating door 5b according to the second embodiment has an extension 41a that extends outside the forward projection plane of the vacuum insulation material 30 on the rear surface of the front panel . In addition, the rear surface of the extension 41a is treated to improve adhesion to the foam insulation 50 (see FIG. 3A). Examples of this treatment to improve adhesion include, but are not limited to, roughening the rear surface of the extension 41a and treating it with a coupling agent.

[0039] According to the insulating door 5b of the second embodiment, the extension portion 41a (see FIG. 4) can increase the heat transfer area of ​​the heat transfer member 41 (see FIG. 4) compared to the heat transfer member 40 (see FIG. 2) of the first embodiment. Furthermore, according to the second embodiment of the insulated door 5b, the rear surface of the extension 41a is subjected to an adhesion improving treatment, so that the adhesion to the foam insulation material 50 (see FIG. 3A) can be improved regardless of the material of the heat transfer member 41, and both strong bonding of the front panel 10 and prevention of condensation can be achieved. This increases the freedom of selection of the material of the heat transfer member 41.

[0040] Third embodiment Next, a heat-insulating door according to a third embodiment will be described. In the following, the same components as those in the heat-insulating door 5a (see FIG. 2) of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0041] Fig. 5 is a partially enlarged cross-sectional view of a heat-insulating door 5c according to the third embodiment, which also includes reference symbols P0 to P5 indicating temperature measurement positions in the examples described below. As shown in FIG. 5, the insulated door 5c of the third embodiment includes a gasket 61 provided on the peripheral edge of the rear surface of the rear panel 60, and a handle H formed in a recess 23a where the outer periphery of the door frame 20 (frame member 23) is partially recessed toward the insulating section 8 (FIG. 3B). 5. The heat-insulating door 5c is formed so that the depth of the recess 23a is shallower than the position of the packing 61 when viewed from the front of the heat-insulating door 5c in the direction of the outline arrow in FIG.

[0042] According to the heat-insulating door 5c of the third embodiment, it is possible to prevent condensation from occurring on the bottom of the recess 23a due to cold heat transferred from the lower freezer compartment 5 (see FIG. 1).

[0043] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be embodied in various forms. The first to third embodiments have been explained using the insulated doors 5a, 5b, and 5c of the lower freezer compartment 5 as examples, but the present invention can also be applied to other pull-out type insulated doors 2a, 2b, 3a, 4a, and 6a (see Figure 1). EXAMPLES

[0044] Next, an example will be described in which the operational effects of the heat-insulating door of this embodiment are verified. Example 1 In this example, for a refrigerator 1 (see FIG. 1) having the insulated door 5a (see FIG. 3B) of the first embodiment in which the temperature of the lower freezer compartment 5 (see FIG. 1) was set to -20°C, the change in surface temperature from the front panel 10 to the door frame 20 (frame member 23) in which the recess 23a was formed was measured. The surface temperature was measured by CAE (computer-aided engineering) analysis. The results are shown in FIG. 6.

[0045] FIG. 6 is a graph showing the surface temperature measurement positions P0, P1, P2, and P3 shown in FIG. 3B, with the horizontal axis representing the distance (m) from measurement position P0 (starting point) and the vertical axis representing the measured temperature (°C) from measurement position P0 to measurement position P3 (end point). 3B, the surface temperature measurement position P0 (starting point) is the vertical center of the front plate 10. The surface temperature measurement position P1 is the upper end portion of the front plate 10. The surface temperature measurement position P2 is the bottom portion of the recessed portion 23a. The surface temperature measurement position P3 is the upper rear end portion of the frame member 23.

[0046] As shown in the diagram of Example 1 in Figure 6, the insulated door 5a (see Figure 3B) of the first embodiment was below the indoor air temperature from the upper rear end of the frame member 23 (measurement position P3) to the upper end of the front panel 10 (measurement position P1) due to the cold heat transmitted from the lower freezer compartment 5 (see Figure 1).

[0047] In contrast, the surface temperature of the front panel 10 was maintained at the room temperature from the center (measurement position P0) to the upper end (measurement position P1) of the front panel 10. That is, in the front panel 10 of the insulated door 5a according to the first embodiment, no temperature drop was observed even in the portion corresponding to the outer periphery 31 of the vacuum insulation material 30 due to the heat transfer member 40. It has been verified that the insulating door 5a of the first embodiment can prevent condensation on the front panel 10 in the portion corresponding to the outer peripheral edge 31 of the vacuum insulating material 30.

[0048] Example 2 In this example, the change in surface temperature from the front panel 10 to the door frame 20 (frame member 23) in which the recess 23a is formed was measured for a refrigerator 1 (see Figure 1) having an insulated door 5c (see Figure 5) of the third embodiment in which the temperature of the lower freezer compartment 5 (see Figure 1) was set to -20°C. The results are shown in Figure 6.

[0049] 6, the surface temperature of the front panel 10 was maintained at the room temperature from the center (measurement position P0) to the upper end (measurement position P1) of the front panel 10. That is, no temperature drop was observed in the front panel 10 of the insulated door 5a according to the first embodiment, even in the portion corresponding to the outer periphery 31 of the vacuum insulation material 30 due to the heat transfer member 40. It has been verified that the insulating door 5a of the first embodiment can prevent condensation on the front panel 10 in the portion corresponding to the outer peripheral edge 31 of the vacuum insulating material 30.

[0050] Furthermore, as shown in the diagram of Example 2 in Figure 6, the insulated door 5c of the third embodiment (see Figure 5) was below the indoor air temperature from the upper rear end of the frame member 23 (measurement position P3) to the upper end of the front panel 10 (measurement position P1) due to the cold heat transmitted from the lower freezer compartment 5 (see Figure 1). However, it was found that the heat-insulating door 5c of the third embodiment (see FIG. 5) maintained a higher temperature at the bottom of the recess 23a (measurement position P2) than the heat-insulating door 5a of the first embodiment (see FIG. 3B) shown in the diagram of Example 1 in FIG. 6. That is, it was verified that the heat-insulating door 5c of the third embodiment (see FIG. 5) can more reliably prevent condensation in the recess 23a that serves as the handle. [Explanation of symbols]

[0051] 1. Refrigerator 5a Insulated door 5b Insulated door 5c Insulated door 8. Insulation section 10 Front Panel 20 Door Frame 20a Inner wall (inner wall on the insulating side of the door frame) 23a Recess (recess in door frame) 30 Vacuum insulation material 31 Outer edge (outer edge of vacuum insulation material) 40 Heat transfer material 41 Heat transfer materials 41a Extension portion (extension portion of heat transfer member) 50 Foam insulation 60 Rear plate 61 Packing H Handle

Claims

1. The front panel and A vacuum insulation material provided adjacent to the rear surface of the front panel; A heat transfer member provided on the rear surface of the front plate along the outer periphery of the vacuum insulation material and having a higher thermal conductivity than the front plate; A thermal insulation door comprising:

2. The vacuum insulation material is embedded in a foam insulation material on the rear side of the front panel, 2. The insulated door according to claim 1, wherein the entire heat transfer member is contained within a forward projection plane of the vacuum insulation material on the rear surface of the front panel.

3. The vacuum insulation material is embedded in a foam insulation material on the rear side of the front panel, The heat transfer member has an extension portion extending outwardly of a forward projection plane of the vacuum insulation material on the rear surface of the front plate, 2. The insulated door according to claim 1, wherein a treatment is applied to a rear surface of the extension of the heat transfer member to improve adhesion to the foam insulation material.

4. a rear plate disposed behind the front plate so as to face the front plate at a predetermined interval; A door frame arranged to surround a thermal insulation portion formed between the front panel and the rear panel; A packing provided on a peripheral portion of a rear surface of the rear plate; A handle formed by a recess in which an outer periphery of the door frame is partially recessed toward the heat insulating portion; Further equipped with 2. The insulated door according to claim 1, wherein the depth of the recess is shallower than the position of the packing when viewed from the front of the insulated door.

5. 5. The insulated door according to claim 4, wherein the distance between the inner wall of the door frame on the insulating portion side and the peripheral end face of the vacuum insulation material facing the inner wall is 10 mm or more.

6. 2. The heat-insulating door according to claim 1, wherein the heat-transfer member is a tape made of aluminum foil having a thickness of 5 μm or more.

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