WO2021171404A1

WO2021171404A1 - Refrigerator

Info

Publication number: WO2021171404A1
Application number: PCT/JP2020/007633
Authority: WO
Inventors: 酒井　啓太; 荒木　正雄
Original assignee: 三菱電機株式会社
Priority date: 2020-02-26
Filing date: 2020-02-26
Publication date: 2021-09-02
Also published as: AU2020431079B2; JPWO2021171404A1; AU2020431079A1

Abstract

A refrigerator (100) according to the present disclosure comprises: double swing-type doors (2, 3); a plate member (31) that, via the outer surface thereof, closes a gap formed between the double swing-type doors (2, 3) when the double swing-type doors (2, 3) have been closed; and a heater (32) that heated the plate member (31), the heater (32) being provided on the inner surface side of the plate member (31). The heater (32) is set apart from an end part of the plate member (31). The refrigerator (100) further comprises a graphite sheet (35) that conductively transfers the heat of the heater (32) to a surface of the plate member (31) located between the end part of the plate material (31) and the heater (32). The graphite sheet (35) is a member in which the thermal conductivity in the direction along the inner surface is higher than the thermal conductivity in the direction from the inner surface to the outer surface.

Description

refrigerator

This disclosure relates to a refrigerator equipped with a double door.

There is a double-door refrigerator that closes the opening for taking in and out the stored items with two doors. A gap is provided between the two doors with the opening closed so that the two doors do not come into contact with each other when opening and closing the doors. In order to prevent the cold air in the refrigerator from flowing out from this gap, one door is provided with a rotatable partition, and when one door closes a part of the opening, the partition rotates. A plate material provided in the partition is configured to close the gap.

This plate material is cooled by the cold air in the refrigerator, and dew condensation occurs on the outer surface of the plate material. In order to prevent this dew condensation, a heat insulating material is provided so as to cover the inner surface of the plate material on the inner side of the refrigerator, and it is suppressed that the plate material is cooled by the cold air in the refrigerator. Further, the plate material is provided with a heater capable of conducting heat, and the plate material is heated by the heater to suppress dew condensation (for example, Patent Document 1 below).

Japanese Unexamined Patent Publication No. 2013-221715

However, in the refrigerator of Patent Document 1 described above, since the end portion of the plate material is not covered with the heat insulating material, the end portion of the plate material is cooled by the cold air in the refrigerator, and the end portion of the plate material has a temperature higher than that of the central portion of the plate material. Is likely to decrease. Further, since the heater is provided on the inside (center side) of the plate material at a distance from the end portion of the plate material, the temperature of the end portion tends to decrease. Therefore, in order to sufficiently heat the end portion of the plate material so that dew condensation does not occur, it is necessary to increase the electric power supplied to the heater.

The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a refrigerator capable of reducing the power consumption of a heater for preventing dew condensation on a plate material.

The refrigerator according to the present disclosure includes a double door, a plate material that closes a gap formed between the double doors with the double door closed on the outer surface, and a plate material provided on the inner surface side of the plate material to heat the plate material. It is equipped with a heater for the door. The heaters are arranged at intervals from the end of the plate material. Further, the refrigerator is further provided with a graphite sheet that conducts the heat of the heater on the surface of the plate material between the end portion of the plate material and the heater. The graphite sheet is a member whose thermal conductivity in the direction along the inner surface is higher than that in the direction from the inner surface to the outer surface.

The refrigerator according to the present disclosure includes a graphite sheet in which the thermal conductivity in the direction along the inner surface of the plate material is higher than the thermal conductivity in the direction toward the outer surface of the plate material, and this graphite sheet is the end portion of the plate material and the heater. The heat of the heater is conducted to the surface of the plate material between the two. Therefore, the heat generated by the heater is not easily transferred to the inside or the outside of the refrigerator, and is easily transferred to the periphery of the end portion where the heater is not provided along the inner surface of the plate material. Therefore, the heat of the heater can be efficiently transferred to the end portion of the plate material, and the power consumption of the heater can be reduced.

It is a perspective view of the refrigerator which concerns on Embodiment 1 of this disclosure. It is sectional drawing of the refrigerator which concerns on Embodiment 1 of this disclosure. It is the schematic of the refrigerant circuit in the refrigerator which concerns on Embodiment 1 of this disclosure. It is a perspective view of the double door of the refrigerator which concerns on Embodiment 1 of this disclosure. It is sectional drawing (YZ plane) of the partition in the refrigerator which concerns on Embodiment 1 of this disclosure. It is sectional drawing (XY plane) of the partition in the refrigerator which concerns on Embodiment 1 of this disclosure. It is a perspective view of the plate material in the refrigerator which concerns on Embodiment 1 of this disclosure. It is an exploded perspective view of the partition which concerns on Embodiment 1 of this disclosure. It is an enlarged view of the cross section (YZ plane) of the partition in the refrigerator which concerns on Embodiment 1 of this disclosure. It is sectional drawing (YZ plane) of the partition in the refrigerator which concerns on Embodiment 1 of this disclosure. It is sectional drawing (YZ plane) of the partition in the refrigerator which concerns on Embodiment 1 of this disclosure. It is a graph which shows the temperature of the partition in the refrigerator which concerns on Embodiment 1 of this disclosure. It is a graph which shows the annual power consumption of the heater in the refrigerator which concerns on Embodiment 1 of this disclosure. 2 is a perspective view of a plate material and a cross-sectional view (YZ plane) of a partition in the refrigerator according to the second embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The same reference numerals in the drawings represent the same or corresponding parts.

Embodiment 1.
First, the overall configuration of the refrigerator 100 according to the first embodiment of the present disclosure will be described with reference to FIGS. 1 to 3.
FIG. 1 is a perspective view of the refrigerator 100, and the front side in the drawing is the front side of the refrigerator 100. FIG. 2 is a cross-sectional view of the refrigerator 100, which is obtained by cutting the refrigerator 100 with a cross section of II-II in FIG. FIG. 3 is a schematic view of the cooling circuit of the refrigerator 100 shown in FIG.

As shown in FIG. 1, the refrigerator 100 includes a hexahedral housing 1, and a door 2 forming a double door between the top plate 1a and the bottom plate 1b on the front side of the housing 1. , A door 3, a pull-out type ice making room door 4, a switching room door 5, a freezer room door 6, and a vegetable room door 7. Here, the bottom plate 1b is a portion that comes into contact with the floor surface of the building when the refrigerator 100 is installed, and the top plate 1a is a portion that faces the bottom plate 1b and is arranged on the ceiling side of the building.
The housing 1 is formed with five spaces for storing the stored material inside. As shown in FIG. 2, four of the five spaces are a refrigerating room 11, a switching room 13, a freezing room 14, and a vegetable room 15 arranged in order from the top. The other space is an ice making room arranged at the back of the switching room 13 in FIG. Each space is a space for cooling the stored material at different temperatures, and is partitioned by

partition plates

1c, 1d, and 1e made of a resin material containing a heat insulating material. Further, the housing 1 is formed with an opening for communicating each space with the outside on the front side of the refrigerator 100, so that the stored items can be taken in and out.
As shown in FIG. 1, the housing 1 is provided with

rotatably doors

2 and 3 on both sides of the opening of the refrigerator compartment 11, and the

doors

2 and 3 rotate to close a part of the opening. Door and open. A gap is formed between the door 2 and the door 3 with the door 2 and the door 3 closed. This gap extends from the top plate 1a of the housing 1 toward the bottom plate 1b.
Further, the ice making room door 4, the switching room door 5, the freezing room door 6, and the vegetable room door 7 slide away from the housing 1 at the openings of the ice making room, the switching room 13, the freezing room 14, and the vegetable room 15, respectively. It is provided as possible.

A cooling device 20 is provided on the back surface side of the housing 1. As shown in FIGS. 2 and 3, the cooling device 20 includes a compressor 21, a condenser 22, an expanding means 23, an evaporator 24, a fan 25, and a defrosting device 26.
As shown in FIG. 3, the compressor 21 is connected to the condenser 22, adiabatically compresses the refrigerant, and sends a high-temperature and high-pressure gaseous refrigerant to the condenser 22. The condenser 22 is connected to the expansion means 23, exchanges heat between the air outside the housing 1 and the refrigerant, liquefies the refrigerant, and sends the refrigerant to the expansion means 23. The expansion means 23 is composed of a capillary tube connected to the evaporator 24, expands the refrigerant, and sends it to the evaporator 24 as a gas-liquid two-phase refrigerant. The evaporator 24 exchanges heat between the return air 27 in the housing 1 and the refrigerant to vaporize the refrigerant and cool the air in the housing 1. Further, the evaporator 24 is connected to the compressor 21 and sends the vaporized refrigerant to the compressor 21. The compressor 21, the condenser 22, the expanding means 23, and the evaporator 24 form a refrigerant circuit for cooling the air in the housing 1.
Further, the cooling device 20 sends the cold air cooled by the evaporator 24 to each space by the fan 25, and maintains the temperature of each space at a low temperature. The cold air sent out by the fan 25 returns from each space to the cooling device 20 as return air 27, is cooled again, and is sent out to each space.
The cooling device 20 is provided with a defrosting device 26 at a position where the return air 27 is blown, and the defrosting device 26 is periodically driven to prevent frost from adhering to the evaporator 24.

Further, as shown in FIG. 2,

heat radiating pipes

16a, 16b, and 16c are embedded in the

partition plates

1c, 1d, and 1e that partition the space inside the housing 1, respectively. Since the

partition plates

1c, 1d, and 1e partition spaces having different temperatures, dew condensation may occur. Therefore, a high-temperature fluid is passed through these heat-dissipating

pipes

16a, 16b, 16c to heat the

partition plates

1c, 1d, and 1e.

Although the overall configuration of the refrigerator 100 has been described above, the space constituting the refrigerating chamber 11 corresponds to the first space, and the space constituting the ice making chamber or the switching chamber 13 corresponds to the second space. Further, in the following description, the top plate 1a side is above the refrigerator 100, and the bottom plate 1b side is below the refrigerator 100. Further, the vertical direction and the direction perpendicular to the direction connecting the front surface and the back surface are the sides of the refrigerator 100. The Z direction in the drawing corresponds to the vertical direction, the Y direction corresponds to the direction connecting the front surface and the back surface, and the X direction corresponds to the direction connecting the side surfaces of the refrigerator 100.

Next, the partition 30 provided in the refrigerator 100 will be described with reference to FIGS. 4 to 9.
FIG. 4 is an enlarged view of the portion of the refrigerator 100 that corresponds to the refrigerating chamber 11 as viewed from the front side. FIG. 5 shows the refrigerator 100 cut along the cross section of VV of FIG. FIG. 6 is an enlargement of the periphery of the partition 30 by cutting the refrigerator 100 along the cross section of VI-VI of FIG. FIG. 7 is a perspective view of the plate material 31 included in the partition 30. FIG. 8 is an exploded perspective view of the heat insulating material 33, the heater 32, the graphite sheet 35, and the plate material 31 included in the partition 30. FIG. 9 is an enlarged view of FIG.
The partition 30 includes a plate member 31, a graphite sheet 35, a heater 32, a heat insulating material 33, and a case 34 (FIG. 5). In FIG. 5, 39a is inside the

housing

1, 39b is outside the housing 1, and the plate members 31 to the case 34 are arranged in the above order from the outside of the housing 1. The partition 30 is rotatably provided on the side surface of the door 2 on the door 3 side. When the door 2 is closed, the partition 30 is arranged so that the outer surface of the plate member 31 located on the outside of the housing 1 is substantially parallel to the front surface of the door 2, and the door 2 is opened. Then, it rotates and folds to the side of the door 2. Further, as shown in FIG. 4, the partition 30 closes the gap between the door 2 and the door 3 formed when the door 2 and the door 3 close the opening of the refrigerating chamber 11 on the outer surface of the plate member 31.

The sheet metal 31 is a square sheet metal made of a metal material such as iron, aluminum, copper, or stainless steel. More specifically, the plate material 31 is a rectangular sheet metal whose longitudinal direction is the direction in which the gap between the door 2 and the door 3 extends, that is, the vertical direction. Further, as shown in FIG. 5, in the plate material 31,

flanges

36a and 36b extend from the upper end portion and the lower end portion toward the case 34 side (internal side of the housing 1), respectively. As shown in FIG. 7, the shapes of the

flanges

36a and 36b are quadrangular (FIG. 7 (a)), fan-shaped (FIG. 7 (b)), or triangular (FIG. 7 (c)). When the

flanges

36a and 36b have a quadrangular shape, the periphery of the end portion of the plate member 31 may be bent, and when the

flanges

36a and 36b have a fan shape and a triangular shape, the

flanges

36a and 36b are further adjusted to the shape. You can cut it.
The plate material 31 has a longitudinal direction shorter than the gap between the door 2 and the door 3 formed when the door 2 and the door 3 close the opening of the refrigerating chamber 11, and the wall above the refrigerating chamber 11 (heaven). A gap is formed between the plate 1a) and the lower wall (partition plate 1c) and the plate material 31 (FIG. 5). Packing 37a and packing 37b are provided on the front side of the top plate 1a and the partition plate 1c, respectively, so that cold air does not flow out from this gap, and when the plate material 31 closes the gap between the door 2 and the door 3. The plate member 31 and the

packings

37a and 37b come into contact with each other. Further, as shown in FIG. 6, packing 37c is provided around the end of the door 2 facing the door 3 when the

doors

2 and 3 close the opening of the housing 1, and similarly, the end of the door 3 is provided. Packing 37c is also provided around the portion. When the plate material 31 closes the gap between the door 2 and the door 3, the plate material 31 and the packing 37c come into contact with each other. These

packings

37a, 37b and 37c are made of a rubber material having high wear resistance.
Further, as shown in FIG. 6,

throats

38a and 38b protruding from the inner surface of the housing of the

doors

2 and 3 are provided on the side of the partition 30, and the cold air in the housing 1 is released. It suppresses the contact with the side of the partition 30 and suppresses the temperature drop of the partition 30.

The heater 32 is a cord heater provided on the inner surface side, which is the back side (inside side of the housing 1) of the plate material 31, and heats the plate material 31 to suppress dew condensation. Further, as shown in FIG. 8, the heater 32 is provided with one cord heater inside (center side) from the end portion of the plate material 31, and is provided on the inner surface of the plate material 31 from the inside side of the housing 1. When the plate material 31 is viewed, the heater 32 is not provided up to the periphery of the end portion of the plate material 31 and is arranged inside the plate material 31 at a distance from the end portion of the plate material 31.
Further, in the heater 32, the outer periphery of the heating wire is covered with an insulating film to suppress a short circuit due to contact with the plate material 31 or the like.

Heat insulating material 33, thermal conductivity, such as styrofoam or urethane foam is made of a material of the foamed plastic system 10 -2 ^{W / m} · K order, heat penetration and the housing 1 from the heater 32 to the housing 1 It suppresses heat leakage from the air to the outside. As shown in FIGS. 5 and 6, the heat insulating material 33 is provided so as to cover the inner surfaces of the heater 32 and the plate material 31.

The case 34 is a box-shaped member provided at a position facing the inner surface of the plate member 31 with the heater 32 interposed therebetween, and is made of a resin material such as acrylic or polycarbonate. As shown in FIGS. 5 and 6, the case 34 has a hexahedral shape and has an opening on one surface, and the heat insulating material 33, the heater 32, and the graphite sheet 35 are housed inside the case 34. , Surrounding. Further, the flange 36a and the flange 36b of the plate material 31 are in contact with the walls of the upper and lower cases, respectively, and these walls and the flange 36a and the flange 36b are fixed by fasteners such as screws, and the plate material 31 is It is fixed to the case 34 via

flanges

36a and 36b so as to cover the opening of the case 34.

The graphite sheet 35 is a sheet-like member containing graphite. A thickness of 40 μm to 100 μm is used. The graphite sheet 35 is provided on the heater 32 so as to be heat conductive. Further, at least, the plate material 31 on which the heater 32 is not provided is provided so as to be heat conductive on the surface around the end portion. In other words, the graphite sheet 35 can conduct the heat of the heater 32 to the surface of the plate 31 between the end of the plate 31 and the heater 32 when viewed from the inside of the housing 1 toward the inner surface of the plate 31. That is, it is provided so that it can conduct heat. In the example shown in FIG. 5, the graphite sheet 35 is provided so as to be heat conductive not only on the inner surface around the end portion of the plate material 31 but also on the entire inner surface of the plate material 31. Further, graphite sheets 35 are provided so as to be heat conductive in all the portions of the heater 32 on the plate material 31 side. In this way, the graphite sheet 35 is provided between the inner surface of the plate member 31 and the heater 32.
The graphite contained in the graphite sheet 35 includes a plurality of layers of hexagonal plate-shaped crystals covalently bonded to carbon, and each layer of the plate-shaped crystals of the graphite sheet is aligned with the inside of the sheet surface of the graphite sheet 35. It is oriented. Therefore, the graphite sheet 35 is a member having a large thermal conductivity in the in-plane direction as compared with the thickness direction of the sheet and having anisotropy in the thermal conductivity. Since the graphite sheet 35 is installed along the inner surface of the plate material 31, each layer of the graphite plate-like crystal is oriented along the inner surface of the plate material 31. Therefore, in the graphite sheet 35, the thermal conductivity in the direction along the inner surface of the plate material 31 is higher than the thermal conductivity in the direction from the inner surface to the outer surface of the plate material 31. Specifically, the thermal conductivity in the direction along the inner surface is 1500 W / m · K, which is 20 times higher than the thermal conductivity of iron, which is an example of the material of the plate material 31, which is about 80 W / m · K. Nearly high. Further, the thermal conductivity in the direction from the inner surface to the outer surface is about 10 W / m · K, which is lower than the thermal conductivity of iron. Therefore, the heat generated by the heater 32 is easily transferred along the inner surface of the plate material 31, and the heat is easily diffused to the end portion of the plate material 31. On the contrary, heat is not easily transferred from the inner surface to the outer surface of the plate member 31, and heat leakage to the outside of the refrigerator 100 is small.

As shown in FIG. 9, the graphite sheet 35 is provided with

adhesive tapes

35a and 35b on both side surfaces, and is adhered to the heater 32 by the adhesive tape 35a. Further, it is adhered to the plate material 31 by the adhesive tape 35b. The adhesive tape 35a and the adhesive tape 35b are made of aluminum tape, vinyl tape, polyimide tape or the like that can reduce the contact thermal resistance, and the heat from the heater 32 is efficiently conducted to the graphite sheet 35 and the plate material 31.

Here, a modified example of the partition 30 according to the first embodiment will be described with reference to FIG. FIG. 10 is a cross-sectional view of the partition 30 corresponding to the cross-sectional view of FIG.
The example of FIG. 10A is the same as the example of the partition 30 shown in FIG. 5, and the graphite sheet 35 is provided on the entire inner surface of the plate member 31. Note that L shown in FIG. 10A indicates the length of the plate member 31 in the vertical direction (longitudinal direction). In this example, heat can be efficiently transferred to both upper and lower ends of the plate member 31.
In the example of FIG. 10B, the graphite sheet 35 is provided on the end side above the center in the longitudinal direction of the plate material 31, the length of the graphite sheet 35 is L / 4, and the upper side of the plate material 31. This is an example in which the graphite sheet 35 is provided in the range from the end of the surface to L / 4. When the heat radiating pipe 16a is provided in the vicinity of the lower end portion of the plate member 31 as in the first embodiment (see FIGS. 2 and 5), the temperature of the lower end portion is unlikely to decrease. In such a case, it is preferable to adopt this example. Further, since the flange 36a is provided at the upper end portion of the plate material 31, it is easy to be cooled. In this way, by providing the graphite sheet 35 around the end portion of the plate material 31 where the flange 36a is provided, the graphite sheet 35 is provided. The temperature drop at the end can be suppressed.
In the example of FIG. 10C, the graphite sheet 35 is provided on the end side above the center in the longitudinal direction of the plate material 31, the length of the graphite sheet 35 is L / 2, and the upper side of the plate material 31. This is an example in which the graphite sheet 35 is provided in the range from the end of the surface to L / 2. This example also efficiently transfers heat to the upper end portion of the plate member 31, and is the same as the example of FIG. 10B.
In the example of FIG. 10D, the graphite sheet 35 is provided on the end side below the center in the longitudinal direction of the plate material 31, the length of the graphite sheet 35 is L / 4, and the lower part of the plate material 31. This is an example in which the graphite sheet 35 is provided in the range from the end of the surface to L / 4. In this example, heat is efficiently transferred to the lower end portion of the plate member 31. Unlike the first embodiment, it is preferable to adopt this example when the heat radiating pipe is provided near the upper end portion of the plate member 31. Further, since the flange 36b is provided at the lower end portion of the plate material 31, it is easy to be cooled. In this way, by providing the graphite sheet 35 around the end portion of the plate material 31 where the flange 36b is provided, the graphite sheet 35 is provided. The temperature drop at the end can be suppressed.
In the example of FIG. 10 (e), the graphite sheet 35 is provided on the end side below the center in the longitudinal direction of the plate material 31, the length of the graphite sheet 35 is L / 2, and the lower part of the plate material 31. This is an example in which the graphite sheet 35 is provided in the range from the end of the surface to L / 2. This example also efficiently transfers heat to the lower end portion of the plate member 31, and is the same as the example of FIG. 10 (d).
In the example of FIG. 10 (f), the graphite sheet 35 is provided on the end side above the center and the end side below the center in the longitudinal direction of the plate member 31, and the length of the graphite sheet 35 is L / 4. This is an example in which two graphite sheets 35 are provided in the range from the upper and lower ends of the plate member 31 to L / 4, respectively. In this example, similar to the example of FIG. 10A, heat can be efficiently transferred to both upper and lower ends of the plate member 31.

Next, the heat diffusion efficiency to the upper end of the plate 31 when the heater 32 is energized in a state where the heat dissipation pipe 16a is provided near the lower end of the plate 31 to dissipate heat, and the heater 32 The power consumption will be described with reference to FIGS. 11 to 13.
FIG. 11 is a cross-sectional view showing the configurations of the partitions 30 and 30'of Comparative Examples 1 to 3 for evaluating the heat diffusion efficiency of the plate member 31.
In order to evaluate the heat diffusion efficiency of the plate material 31 provided with the graphite sheet 35, four partitions 30 shown in FIG. 11 were prepared. FIG. 11A shows a partition 30'without a graphite sheet 35, a temperature sensor 40a near the upper end of the plate material 31, a temperature sensor 40c near the center of the plate material 31, and a lower end of the plate material 31. A temperature sensor 40e, a temperature sensor 40b between the temperature sensor 40a and the temperature sensor 40c, and a temperature sensor 40d between the temperature sensor 40c and the temperature sensor 40e were arranged in the vicinity. This partition 30'is a comparative example.
Further, the following three are prepared as the partition 30 according to the first embodiment. The partition 30 shown in FIG. 11B has a graphite sheet 35 provided on the entire surface of the plate member 31 (corresponding to FIG. 10A). The partition 30 shown in FIG. 11C is formed by providing a graphite sheet 35 having a length of L / 2 in the vertical direction from the upper end of the plate member 31 (corresponding to FIG. 10C). ). The partition 30 shown in FIG. 11D is formed by providing a graphite sheet 35 having a length of L / 4 in the vertical direction from the upper end of the plate member 31 (corresponding to FIG. 10B). ). Similar to the partition 30', the

temperature sensors

40a, 40b, 40c, 40d, and 40e are arranged in the partition 30. The thickness of the graphite sheet 35 was 40 μm.
In the following, the example of FIG. 11 (b) will be referred to as Example 1, the example of FIG. 11 (c) will be referred to as Example 2, and the example of FIG. 11 (d) will be referred to as Example 3.

Next, the above partitions 30 and 30'were installed in the refrigerator 100, energized, and the temperature at each measurement point was measured with the

temperature sensors

40a, 40b, 40c, 40d, and 40e.
In the test environment, a refrigerator 100 was installed in a constant temperature and humidity chamber in accordance with JIS standards (JIS9801), and the outside air temperature was 32 ° C. and the relative humidity was 70% R. H. The energization rate of the heater 32 was set to 40%.
FIG. 12 shows the minimum temperature of the plate material 31 in the partitions 30 and 30'of Comparative Examples, Examples 1 to 3. The minimum temperature is shown by the difference when the comparative example is set to zero.
The minimum temperature was measured by the temperature sensor 40a arranged near the upper end of the plate member 31 in each example. Since the temperature measured by the temperature sensor 40e arranged near the lower end of the plate 31 is affected by the heat radiation from the heat dissipation pipe 16a, the temperature at the upper end of the plate 31 is lower.
Comparing the minimum temperature, in Examples 1 to 3, the temperature was 0.9 K or more higher than that in Comparative Example. That is, in Examples 1 to 3, heat can be efficiently transferred to the upper end portion of the plate member 31. It is considered that this is because the heat generated by the heater 32 is easily diffused in the direction along the plate material 31, and the heat of the heater 32 is sufficiently transferred to the upper end portion of the plate material 31.
Further, when comparing Examples 1 to 3, the minimum temperature of Example 2 and Example 3 was higher than that of Example 1. That is, in the second and third embodiments, heat can be transferred more efficiently to the upper end portion of the plate member 31. In the case of the first embodiment in which the graphite sheet 35 is attached to the entire surface of the plate material 31, the heat generated by the heater 32 is used to heat the entire surface including the lower end portion and the central portion of the plate material 31. On the other hand, in Examples 2 and 3, the heat of the heater 32 arranged above the plate material 31 is difficult to be transferred to the lower part and the central portion of the plate material 31, and is used to heat the upper end portion. it is conceivable that.
From the above, it can be said that the partition 30 provided with the graphite sheet 35 as in Examples 1 to 3 has high heat diffusion efficiency to the upper end portion of the plate material 31.

Next, for Comparative Examples, Examples 1 to 3, the results of calculating the annual power consumption of the heater 32 from the minimum temperature measured as described above are shown in FIG.
The power consumption of the heater 32 required to suppress the dew condensation on the plate material 31 depends on the minimum temperature of the plate material 31. This is because the part with the lowest temperature is most likely to condense. As described above, in Examples 1 to 3, the minimum temperature is higher than that in Comparative Example, so that the temperature can be maintained at a temperature at which dew condensation does not occur even if the energization rate of the heater 32 is lowered and the power consumption is reduced. Therefore, the power consumption of Examples 1 to 3 is 87% to 89% as compared with Comparative Example, and the power consumption can be reduced from 11% to 13%. The power consumption shown here is the annual temperature and humidity generation probability specified in JIS C9801-3, and the energization of the heater 32 required to keep the plate material surface temperature above the dew point at each temperature and humidity. It is calculated using the rate.
Further, since the minimum temperature of Example 2 and Example 3 is higher than that of Example 1, the power consumption of Example 2 and Example 3 can be further reduced.

Up to this point, Examples 1 to 3 have been described. In particular, as shown in the evaluation results of Examples 2 and 3, when the graphite sheet 35 is brought into contact with the periphery of the end portion of the plate material 31, the graphite sheet 35 is brought into contact with the plate material 31. The heat generated by the heater 32 is efficiently transferred toward the end portion. Therefore, also in the other modified example of the first embodiment (the example shown in FIG. 11), it is possible to raise the temperature of the end portion on the side to which the graphite sheet 35 is attached as compared with the comparative example.

The refrigerator 100 according to the first embodiment of the present disclosure is configured as described above, and has the following effects.
The refrigerator 100 includes a graphite sheet 35 which is a member whose thermal conductivity in the direction along the inner surface of the plate material 31 is higher than the thermal conductivity in the direction from the inner surface to the outer surface of the plate material, and the graphite sheet 35 is a heater. The plate material 31 in which the 32 and the heater 32 are not provided is provided so as to be heat conductive around the end portion of the plate material 31, and the heat of the heater 32 is transmitted to the surface around the end portion of the plate material 31. Therefore, the heat generated by the heater 32 is difficult to be transmitted to the inside or the outside of the refrigerator 100, and is easily transferred to the periphery of the end portion where the heater 32 is not provided along the inner surface of the plate member 31. That is, in the refrigerator (comparative example) not provided with the graphite sheet 35, the heat of the heater 32 leaks to the inside or the outside of the refrigerator and is wasted, but the refrigerator 100 ends the leaked heat. It can be communicated to the department and used effectively. Therefore, as shown in FIG. 12, the temperature around the end portion of the plate member 31 can be raised. Therefore, the electric power required to prevent dew condensation around the end portion of the plate member 31 can be reduced, and the power consumption of the heater 32 can be reduced.

Further, since the refrigerator 100 is provided with the above-mentioned graphite sheet 35, the heat around the heater 32 can be efficiently diffused to the end portion of the plate material 31, so that the temperature of the plate material 31 around the heater 32 and the plate material 31 can be efficiently diffused. The difference in temperature at the ends of the plate 31 can be reduced, and the temperature distribution of the plate 31 can be made uniform. Therefore, it is possible to provide a high quality refrigerator 100.

In the refrigerator 100, a graphite sheet 35 is interposed between the heater 32 and the inner surface of the plate material 31. Therefore, it is possible to prevent the heat generated by the heater 32 from being directly transmitted to the plate material 31 and leaking to the outside of the refrigerator 100.

The refrigerator 100 includes a graphite sheet 35 on the end side of the plate member 31 in the longitudinal direction with respect to the center. By providing the graphite sheet 35 on the end side from the center of the plate material 31 in this way, heat can be efficiently diffused to the end portion of the plate material 31 as shown in FIG.

In the refrigerator 100, a heat radiating pipe 16a is provided in the partition plate 1c between the refrigerating chamber 11, the switching chamber 13, and the ice making chamber, and the graphite sheet 35 is an end of the plate material 31 that is separated from the heat radiating pipe 16a. It is provided on the inner surface of the part side. The heat from the heat radiating pipe 16a is easily transferred to the end portion of the plate material 31 close to the heat radiating pipe 16a to maintain a high temperature, but the temperature tends to decrease at the distant end portion. Since the graphite sheet 35 is provided on the distant end side, heat can be transferred to the end portion which is more easily cooled, and the power consumption of the heater 32 can be reduced.

In the refrigerator 100, in order to fix the plate material 31 to the case 34, the plate material 31 is provided with

flanges

36a and 36b extending from the end portions. Since the

flanges

36a and 36b extend toward the inside of the housing 1 and are not provided with the heat insulating material 33, they are easily cooled by cold air, and the ends of the plate material 31 provided with the

flanges

36a and 36b are other ends. The temperature is more likely to drop than the part. Since the refrigerator 100 is provided with the graphite sheet 35 around the ends where the

flanges

36a and 36b are provided, heat can be transferred to the end where it is easier to cool, and the power consumption of the heater 32 can be reduced. ..

Here, a modified example of the refrigerator 100 according to the first embodiment of the present disclosure and a supplementary explanation will be given.
In the refrigerator 100, the door of the refrigerating chamber 11 is composed of

double doors

2 and 3, but the door of the refrigerating chamber 11 may be a pull-out type or a single-opening type door. , The door of the switching chamber 13, the freezer compartment 14, or the vegetable compartment 15 may be a double door type. In this case, the partition 30 of the first embodiment is provided in the double door provided around the opening of the ice making room, the switching room 13, the freezing room 14, or the vegetable room 15.

In the first embodiment, the gap between the door 2 and the door 3 extends in the vertical direction, but the gap may extend not only in the vertical direction but also in the lateral direction. In this case, the door 2 and the door 3 have an opening. Arranged above and below.

In the first embodiment, the configuration in which the graphite sheet 35 is sandwiched between the plate material 31 and the heater 32 has been described, but the heater 32 may be configured to be sandwiched between the graphite sheet 35 and the plate material 31. In this case, the graphite sheet 35 is pressed from the heat insulating material 33 side against the heater 32 and the plate material 31 to be deformed, and is provided on the heater and the plate material 31 so as to be heat conductive. By doing so, the graphite sheet 35 is interposed between the heater 32 and the heat insulating material 33, so that the heater 32 and the heat insulating material 33 are not in contact with each other. Therefore, the heat generated by the heater 32 is directly transmitted to the heat insulating material 33, and it is possible to prevent the heat from leaking into the refrigerator 100.

In the first embodiment, an example in which the heat radiating pipe 16a is arranged around the lower end portion of the plate material 31 is shown, but the heat radiating pipe is located around the upper end portion of the plate material 31, that is, the top plate 1a of the housing 1. It may be provided inside. In this case, it is preferable to use the partition 30 of FIG. 11 (d) or FIG. 11 (e).

Embodiment 2.
Next, a second embodiment of the present disclosure will be described. The same parts as those described in the first embodiment will be omitted, and the parts different from the first embodiment will be described below. The refrigerator 100 of the second embodiment can be implemented in combination with the modified example of the first embodiment.
In the first embodiment, the

flanges

36a and 36b are formed by bending the plate member 31, so that the

flanges

36a and 36b are made of sheet metal.
In the second embodiment, the

flanges

236a and 236b are made of a resin material.

In the refrigerator 100 of the second embodiment, as shown in FIGS. 14A and 14B,

flanges

236a and 236b extending from the end of the plate member 31 toward the case 34 are made of a resin material. .. The resin material is composed of a material having a lower thermal conductivity than sheet metal, such as polypropylene resin and acrylonitrile resin.
Since the plate material 31 made of sheet metal and the

flanges

236a and 236b made of resin material are different materials, they are joined with an adhesive, double-sided tape, hot melt, caulking, screw tightening, riveting, hook claws, or the like.

The refrigerator 100 according to the second embodiment of the present disclosure is configured as described above, and has the same effects as those of the first embodiment and also has the following effects.
Since the

flanges

236a and 236b of the plate material 31 of the refrigerator 100 are made of a resin material, it is possible to prevent the end portion of the plate material 31 from being cooled by the cold air inside the housing 1. Therefore, the power consumption of the heater can be reduced.

The refrigerator of the present disclosure can be used for storage of stored items.

1 housing, 1a top plate, 1b bottom plate, 1c partition plate, 1d partition plate, 1e partition plate, 2 doors, 3 doors, 4 ice making room doors, 5 switching room doors, 6 freezer room doors, 7 vegetable room doors, 11 Refrigerator room, 13 switching room, 14 freezer room, 15 vegetable room, 16a heat dissipation pipe, 16b heat dissipation pipe, 16c heat dissipation pipe, 20 cooling device, 21 compressor, 22 condenser, 23 expansion means, 24 evaporator, 25 fan, 26 defroster, 27 return air, 30 partition, 31 plate material, 32 heater, 33 heat insulating material, 34 case, 35 graphite sheet, 35a adhesive tape, 35b adhesive tape, 36a flange, 36b flange, 37a packing, 37b packing, 38a throat, 38b throat, 39a inside the housing, 39b outside the housing, 40a temperature sensor, 40b temperature sensor, 40c temperature sensor, 40d temperature sensor, 40e temperature sensor, 230 partition, 236a flange, 236b flange

Claims

A double door, a plate material that closes the gap formed between the double doors with the double door closed on the outer surface, and a heater provided on the inner surface side of the plate material to heat the plate material. In a refrigerator equipped with,
The heaters are arranged at a distance from the end portion of the plate material.
A graphite sheet that conducts the heat of the heater is further provided on the surface of the plate material between the end portion of the plate material and the heater.
The graphite sheet is a member whose thermal conductivity in the direction along the inner surface is higher than the thermal conductivity in the direction from the inner surface to the outer surface.
A refrigerator that features that.
The refrigerator according to claim 1, wherein the graphite sheet is provided between the heater and the inner surface of the plate material.
Further provided with the heater and a heat insulating material provided so as to cover the inner surface of the plate material.
The refrigerator according to claim 1, wherein the graphite sheet is provided between the heater and the heat insulating material.
The longitudinal direction of the plate material is a direction along the direction in which the gap between the double doors extends.
Any one of claims 1 to 3, wherein the graphite sheet is provided so as to be thermally conductive on the end side of the plate material in the longitudinal direction with respect to the center of the plate material in the longitudinal direction. Refrigerator as described in the section.
The double door and the opening closed by the plate material, the first space for storing the storage communicating with the outside by the opening, and the first space arranged side by side in the direction in which the gap extends. Further, it is provided with a housing in which a second space for cooling the storage is formed at a temperature different from that of the first space.
The first space and the second space are partitioned by a partition plate, and the partition plate is provided with a heat radiating pipe for heating the partition plate.
Any of claims 1 to 4, wherein the graphite sheet is provided so as to be heat conductive on the end side of the plate material that is farther from the heat radiating pipe than the end portion close to the heat radiating pipe. The refrigerator described in item 1.
A case provided at a position facing the plate material across the heater is further provided.
The plate material is provided with a flange extending toward the case side at least at a part of the end portion.
The plate material is fixed to the case via the flange, and is fixed to the case.
The graphite sheet is provided on the inner surface of the plate material so as to be heat conductive on the surface of the plate material between the end portion of the plate material provided with the flange and the heater. The refrigerator according to any one of claims 1 to 5.
The refrigerator according to claim 6, wherein the plate material is made of sheet metal, and the flange is made of a resin material.
The refrigerator according to any one of claims 1 to 3, wherein the graphite sheet is provided so as to be heat conductive on the entire inner surface of the plate material.