JP2020008269A - Magnet gasket and cooling device - Google Patents

Abstract

To improve heat insulating performance of a magnet gasket.SOLUTION: A cooling device comprises: a heat insulation box body which has a storage space opened forward and also has an opening end face surrounding an opening and facing forward; a door which enables the opening to be opened and closed, and is fitted to the heat insulation box; a magnet holding part which is fitted to an inner peripheral edge of the door facing the opening end face with the opening closed, and holds a magnet and a magnet; and a magnet gasket which has, between the magnet and the magnet holding part, a heat insulation sheet provided at a door-side side part of a peripheral surface of the magnet in a closed state in which the door closes the opening and a side part facing inward in a width direction in the closed state.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cooling device provided with a magnet gasket and a magnet gasket on a peripheral edge inside a storage of a door.

  In refrigerators, the inside of the refrigerator (hereinafter also referred to as “inside”) is insulated and kept at a low temperature, so that cool air in the refrigerator leaks out of the refrigerator or outside air from outside of the refrigerator (hereinafter also referred to as “outside”). It is necessary to prevent intrusion into the warehouse. For this reason, in a state where the door is closed, it is required that the opening end face of the heat-insulating box body, which is the storage section, and the peripheral edge of the door abutting on this opening end face are kept in close contact with the entire circumference. Therefore, in refrigerators, generally, a flexible magnet gasket is provided on the inner peripheral edge of the door, and in a state where the door is closed, the magnetic heat of the magnet gasket makes the heat insulating box and the door come into close contact with each other. I have.

  Refrigerators are operated continuously every day unlike other home electric appliances, so there is a very strong demand for energy saving for refrigerators. For this reason, the magnet gasket is devised to ensure that the heat-insulating box and the door are in close contact with each other over the entire circumference, and to prevent heat transfer from the magnet gasket to the inside of the refrigerator.

For example, by bringing the magnet of the magnet gasket attached to the door into direct contact with the opening end face of the heat-insulating box, the magnetic force (attraction force) acting on the opening end face is strengthened, and the close contact between the door and the heat-insulating box is more reliably achieved. (For example, see Patent Document 1).

  FIG. 7 is a cross-sectional view of a main part showing a state of close contact between a door disclosed in Patent Document 1 and an opening end surface of a heat insulating box. The heat-insulating box shown in FIG. 7 is a refrigerator main body and includes an outer box 70, an inner box 72, and a heat insulating material 71 filled between the outer box 70 and the inner box 72. I have. A magnet gasket 60 is attached to the periphery of the back side of the door 50 (the side facing the opening end face of the heat-insulating box), while the periphery of the front face (opening end face) of the outer box 70 is formed of a magnetic material. A flange 72a is provided. When the magnet gasket 60 is attracted to the flange portion 72a, the door 50 and the heat insulating box adhere to each other via the magnet gasket 60. As a result, the space between the door 50 and the outer box 70 is effectively sealed, and the storage room 80 (inside the refrigerator) is thermally isolated from the outside. Further, heat transfer between the inside and outside of the storage is suppressed by the heat insulating material 71 filled between the outer box 70 and the inner box 72. With such a configuration, the inside of the storage room 80 is maintained at a predetermined temperature.

  The door 50 includes a door inner plate 51, a mounting groove 52, and a heat insulating material 71, and a refrigerant pipe 90 is disposed inside the heat insulating box near the outer box 70.

  Here, the magnet gasket 60 includes a magnet holding portion 61, a magnet 62, a mounting portion 63, and a bag-shaped portion 64 connecting the magnet holding portion 61 and the mounting portion 63.

  The magnet holding portion 61 is not a bag-like one into which a string-like magnet is inserted as in the related art, but has a U-shaped cross section in which the surface on the heat-insulating box side serving as a suction surface is opened. A wedge-shaped ridge is integrally formed on the magnet holding portion 61 from the U-shaped bottom surface toward the magnet 62. The wedge-shaped ridge is provided on the magnet gasket 60 over the entire circumference.

  The magnet 62 is housed in the magnet holding unit 61. The magnet 62 is arranged so that the outer flat surface 62a exposed from the magnet holding portion 61 when the door is closed faces the end surface of the opening end surface of the heat insulating box. A fitting groove having a narrow opening (entrance) is formed on the lower surface side of the magnet 62. By fitting the wedge-shaped ridge of the magnet holding portion 61 into the fitting groove by utilizing its elasticity, the magnet 62 is attached so as not to come off from the magnet holding portion 61.

  The outer flat surface 62a of the magnet 62 is provided with two grooves 62b, and heat conduction is suppressed by the air layer of the grooves 62b. Since the magnet 62 directly contacts the opening end face of the heat insulating box, a sufficient attraction force can be obtained without attenuating the magnetic force.

  Further, a magnet gasket provided with a block-shaped heat insulating material on a surface facing the outside of the refrigerator in order to prevent heat of the outside air from entering from outside the refrigerator due to heat conduction of the magnet gasket itself is disclosed (for example, Patent Reference 2). This magnet gasket has a configuration in which a cavity is provided with a cavity on the solid side for insulation of the cavity, and a block-shaped heat insulating material is provided on a surface of the wall of the cavity in contact with air outside. With such a configuration, the heat transmitted by the heat conduction and convection of the air in the cavity and the heat transmitted through the magnet gasket itself are cut off by the heat insulating material, and the transmission of the heat into the storage is suppressed. For this reason, the cooling efficiency for cooling the inside of the heat insulating box can be improved.

  In another prior example, the configuration of a magnet gasket having an air layer provided between the magnet and the magnet holding portion to prevent external heat from entering the inside of the refrigerator from near the magnet of the door magnet gasket is also provided. It is disclosed (for example, see Patent Document 3). The refrigerator disclosed in Patent Literature 3 has a refrigerator main body, a door, and a magnet gasket on a periphery of the door. The magnet gasket includes a mounting portion that is mounted on the door, a magnet holding portion that holds a magnet therein, and a flexible portion that connects the mounting portion and the magnet holding portion in a stretchable manner. This magnet gasket is characterized in that an air layer is formed between the magnet and the inner peripheral surface of the magnet holding portion inside the magnet holding portion.

  This makes it possible to reduce the size of the magnet while retaining the magnetic force of the attracting surface portion of the magnet, and to reduce the heat transferred to the magnet from entering the interior of the refrigerator through the magnet holding portion.

JP 2005-188840 A JP 2009-109053 A JP 2011-237117 A

  In the magnet gasket described in Patent Document 1 shown in FIG. 7, the magnet 62 directly adheres to the opening end face of the heat-insulating box, so that a large magnetic force acts on the heat-insulating box, and the magnet gasket 60 and the heat-insulating box intersect. The effect that the suction force in can be increased. However, since the magnet 62 is in direct contact with the opening end face of the heat insulating box, the magnet 62 may be chipped (damaged) as the number of times the door 50 is opened and closed increases. Further, dust easily accumulates in the concave groove 62b of the magnet 62, and when the magnet 62 is brought into contact with the opening end face of the heat insulating box, a gap due to the dust is formed between the magnet 62 and the opening end face of the heat insulating box. This causes the heat insulation performance to easily deteriorate. Further, there is a possibility that the magnet 62 may come off the magnet holding portion 61 due to long-term use.

  The magnet gasket described in Patent Document 2 is provided with a block-shaped heat insulating material on the surface in contact with the air outside the wall surface of the cavity, so that the transfer of heat between the outside and the inside of the cavity is performed in the block shape. Insulated by thermal insulation. Therefore, the thermal efficiency of the refrigerator can be improved. However, since the heat insulating material is thicker and higher in rigidity than the gasket member (that is, the portion excluding the magnet and the heat insulating material from the magnet gasket), the flexibility of the magnet gasket as a whole decreases. For this reason, it may be difficult for the magnet gasket to uniformly adhere to the opening end surface of the heat insulating box over the entire circumference. For this reason, the heat insulation performance of the magnet gasket may be insufficient.

  In the magnet gasket described in Patent Document 3, since an air layer is formed between the magnet and the magnet holding portion, heat transmitted from the opening of the heat insulating box to the magnet is blocked by the air layer. It is. Therefore, it is possible to suppress heat that enters from outside of the refrigerator via the magnet gasket. However, when an air layer is provided inside the magnet holding portion, the entire thickness of the magnet gasket must be increased or the magnet must be thinned. When the thickness of the magnet gasket is increased, the gap between the heat-insulating box and the door becomes large, so that the outside air flows into the refrigerator and the cool air flows out of the refrigerator to the outside of the refrigerator. On the other hand, when the magnet is made thinner, the magnetic force is weakened, so that it becomes difficult to uniformly adhere the magnet gasket to the opening end surface of the heat insulating box. For this reason, the heat insulation performance of the magnet gasket may be insufficient.

  The present disclosure solves the above-described problems of the related art, and has an object to improve the heat insulation performance of a magnet gasket and a cooling device.

  A cooling device according to an aspect of the present disclosure includes a heat-insulating box body that has a housing space that opens forward, surrounds the opening, and has an opening end face that faces forward, and the heat-insulating box that opens and closes the opening. A door attached to a body, attached to an inner peripheral portion of the door facing the opening end surface in a state where the opening is closed, and a magnet and a magnet holding unit that holds the magnet; and the magnet and the magnet holding unit. In the closed state in which the door closes the opening, the heat insulating sheet provided on the side of the magnet on the side of the door and the side facing inward in the width direction in the closed state. And a magnet gasket having:

  A magnet gasket according to an aspect of the present disclosure includes a magnet, a magnet holding unit that holds the magnet, and a heat insulating sheet provided between the magnet and the magnet holding unit.

  A cooling device according to an aspect of the present disclosure includes a heat-insulating box body that has a storage space that opens forward, surrounds the opening, and has an opening end face that faces forward, and the heat-insulating box body that can open and close the opening. And a magnet gasket according to an embodiment of the present disclosure, which is attached to an inner peripheral portion of the door facing the opening end face in a state where the opening is closed.

  According to the present disclosure, the heat insulation performance of the magnet gasket can be improved.

1 is a schematic perspective view of a refrigerator according to an embodiment of the present disclosure. FIG. 2 is a diagram showing a structure of a heat insulating box, a magnet gasket, and a door in the refrigerator according to the present embodiment, and is a cross-sectional view of a main part along plane A in FIG. FIG. 4 is a cross-sectional view taken along a direction perpendicular to a length direction, showing a structure of a magnet gasket in the refrigerator according to the present embodiment. FIG. 4 is a cross-sectional view of the refrigerator according to the present embodiment, illustrating a state in which the magnet and the heat insulating sheet are attached to each other, which is cut in a direction perpendicular to the length direction. The figure which shows the model area | region of the simulation which calculated the invasion heat from the gasket periphery. FIG. 3 is an enlarged view of a gasket magnet peripheral portion in a model region. The figure showing the result of simulation (penetration calorie). Sectional drawing which shows the modification of a magnet in the refrigerator which concerns on this Embodiment. Sectional drawing which shows an example of the conventional gasket structure.

  Hereinafter, a magnet gasket and a refrigerator according to an embodiment of the present disclosure will be described with reference to the drawings. The embodiments described below are merely examples, and do not exclude various modifications and application of techniques not explicitly described in the following embodiments. In addition, each configuration of the embodiment can be variously modified and implemented without departing from the spirit thereof. Furthermore, each configuration of the embodiment can be selected as needed or can be appropriately combined.

  In all the drawings for describing the embodiments, the same elements are denoted by the same reference numerals in principle, and the description thereof may be omitted.

[1. Constitution]
Hereinafter, the side having the doors 21 to 26 will be referred to as a front side, and the opposite side will be referred to as a rear side. In addition, the left and right are determined based on the case where the user looks from front to back. Both the left and right directions are collectively referred to as the width direction. Further, the direction approaching the width direction center CL is referred to as the width direction inside, and the direction away from the width direction center CL is referred to as the width direction outside.

[1-1. Configuration of refrigerator]
Hereinafter, an overall configuration of the refrigerator 1 will be described with reference to FIG. FIG. 1 is a schematic perspective view of a refrigerator 1 (cooling device) according to an embodiment of the present disclosure.

  The refrigerator 1 includes a heat insulating box 10 having a housing space 10d (hereinafter also referred to as “inside”) formed therein and opening to the front side, and a plurality of doors 21 to 21 that are openably and closably attached to the heat insulating box 10. 26, and a magnet gasket 30, which will be described later, provided on the inner periphery of these doors 21 to 26. The compartment 10d is partitioned into a refrigerator compartment 11, a second freezer compartment 12, an ice making compartment 13, a first freezer compartment 14, and a vegetable compartment 15 by being fractionated by a partition plate (not shown). .

  The inner peripheral portion of the doors 21 to 26 refers to the outer peripheral edge of the surface facing the inside 10d in a state where the doors 21 to 26 are closed. More specifically, the inner peripheral portions of the doors 21 to 26 are, in a state where the doors 21 to 26 are closed, a heat insulating box 10, a refrigerator 11, a second freezer compartment 12, an ice making compartment 13, and a first Of the freezing room 14 and the vegetable room 15 (that is, the surface around the opening, see FIG. 2).

  In the following description, when the doors 21 to 26 are not particularly distinguished, they are referred to as doors 20.

  The heat insulation box 10 is provided with a refrigerator compartment 11 at the uppermost part thereof, an ice making chamber 13 with a second freezer compartment 12 below the refrigerator compartment 11, and a first freezer compartment 14 at a lower portion thereof, and a refrigerator compartment 14 at the lower part thereof. The vegetable compartment 15 is arranged at the lower part.

  In the present embodiment, the refrigerator compartment 11, the second freezer compartment 12, the ice making compartment 13, the first freezer compartment 14, and the vegetable compartment 15 are provided as described above. The configuration is not limited to this. For example, a refrigerator that has only a refrigerator compartment, a refrigerator that has only a freezer compartment, a refrigerator that has a refrigerator compartment and only one or three or more freezer compartments, etc. It goes without saying that the present invention can be applied without any limitation.

  The refrigerator compartment 11, the second freezer compartment 12, the ice making compartment 13, the first freezer compartment 14, and the vegetable compartment 15 have openings as described above. A door 20 is provided at each opening. For example, the refrigerating room 11 includes a rotating refrigerating room right door 21 and a refrigerating room left door 22, and has a structure in which a double door is opened. Inside the refrigerator compartment 11, a refrigerator compartment shelf (not shown) and a refrigerator compartment case (not shown) are provided. The second freezing room 12, the ice making room 13, the first freezing room 14, and the vegetable room 15 are drawer-type accommodation rooms, respectively, and the second freezing room door 23, the ice making room door 24, the first freezing room. The door 25 and the vegetable room door 26 are provided integrally.

  The temperature of the refrigerating compartment 11 is set to be in a range of about 1 ° C. to 5 ° C., which is a refrigerating temperature range in which the temperature does not freeze for refrigeration. The temperature of the vegetable room 15 is set in a range of about 2 ° C. to 7 ° C., which is a refrigerator temperature zone equivalent to the refrigerator room 11 or a vegetable temperature zone slightly higher than the refrigerator temperature zone. The first freezer compartment 14 is usually set to a temperature range of about −22 ° C. to −15 ° C. for frozen storage, but if it is desired to further improve the frozen storage state of the contents, for example, −30 ° C. The temperature can be set to a low temperature of about -25 ° C.

  The temperature of the second freezing compartment 12 is set to a temperature range of −20 ° C. to −12 ° C., which is a freezing temperature zone equivalent to the first freezing compartment 14 or a temperature zone slightly higher than the freezing temperature zone. The ice making room 13 creates and stores ice using water sent from a water storage tank (not shown) in the refrigeration room 11 by an automatic ice making machine (not shown) provided at the upper part of the room.

  In addition, each set temperature range in the refrigerator compartment 11, the second freezer compartment 12, the ice making compartment 13, the first freezer compartment 14, and the vegetable compartment 15 described above is a typical temperature range. It is not limited to the temperature range, but is appropriately set in accordance with each usage mode and the like.

  The refrigerator 1 has a machine room (not shown). This machine room accommodates high-pressure side components of the refrigeration cycle such as a compressor and a dryer for removing moisture. The refrigeration cycle is a series of refrigerants sequentially provided with a compressor (not shown), a condenser (not shown), a capillary (not shown) as a decompressor, and a cooler (not shown). It is formed from a channel. A hydrocarbon-based refrigerant, for example, isobutane is sealed in the refrigerant channel.

  Note that the configuration of the refrigeration cycle of the refrigerator 1 of the present disclosure is not limited to the above configuration, and any configuration may be used as long as it generates cool air in a temperature range required for refrigeration and freezing. Can also be used.

[1-2. Configuration of main part of refrigerator and magnet gasket]
Hereinafter, with reference to FIGS. 2 to 4, a configuration of a main part of the refrigerator 1 and the magnet gasket 30 will be described. FIG. 2 is a diagram showing a structure of the heat insulating box 10, the magnet gasket 30, and the door 20 in the refrigerator 1 according to the present embodiment, and is a cross-sectional view of a main part along the A plane shown by a dashed line in FIG. is there. FIG. 3 is a view showing a structure of the magnet gasket 30 in the refrigerator 1 according to the present embodiment, and is a cross-sectional view (transverse cross-sectional view) cut in a direction perpendicular to a length direction (extending direction of the magnet gasket 30). ). FIG. 4 is a cross-sectional view taken along a direction perpendicular to the length direction, showing a state in which the magnet and the heat insulating sheet are bonded together in the refrigerator according to the present embodiment.
As shown in FIG. 2, the heat insulating box 10 includes an outer box 10a using a magnetic material (for example, a steel plate), an inner box 10b molded of a resin such as ABS resin, and an outer box 10a and an inner box 10b. And a heat insulating member 10c such as a hard foamed polyurethane resin which is filled while being foamed in the space between the two.

  In the refrigerator 1, when the refrigerator compartment 11 (see FIG. 1) or the like is cooled, a part of the outer box 10a may be cooled and dew condensation may occur on the outer box 10a. In order to prevent this, a radiating pipe 40 serving as a heat source is arranged inside the outer box 10a as shown in FIG.

  The heat insulating member 10c is not limited to a resin such as a foamed polyurethane resin. As the heat insulating member 10c, any material having heat insulating properties such as a vacuum heat insulating material can be used as appropriate.

  As shown in FIG. 2, each door 20 is foamed in a door outer plate 20a, for example, a door inner plate 20b formed of ABS resin, and a space between the door outer plate 20a and the door inner plate 20b. And a heat insulating member 20c such as hard foam urethane to be filled. Further, in each door 20, a fitting groove 20d for fitting and fixing the mounting portion 33 of the magnet gasket 30 is also formed by depressing the door inner plate 20b.

  The heat insulating member 20c is not limited to a resin such as polyurethane foam, like the heat insulating member 10c used for the heat insulating box 10. For example, a vacuum heat insulating material or the like may be used for the heat insulating member 20c.

  As shown in FIG. 2, at the periphery of each door 20 on the storage room side, a gap between the door 20 and the heat-insulating box 10 is sealed to prevent leakage of cold air and intrusion of heat of outside air. A magnet gasket 30 made by extruding a soft resin such as polyvinyl chloride is provided.

  The magnet gasket 30 is provided on a magnet 31 having flexibility, a magnet holding part 32, a mounting part 33, a connecting part 34 connecting the magnet holding part 32 and the mounting part 33, and a peripheral surface of the magnet 31. Heat insulating sheet 35.

  The magnet holding section 32 holds and incorporates the magnet 31. This magnet holder 32 is different from the magnet holder 61 of Patent Document 1 described with reference to FIG. Specifically, the magnet holding portion 32 also covers the peripheral surface of the magnet 31 facing the opening end face 10A of the heat insulating box 10 when the door 20 is closed. That is, the magnet gasket 30 is configured so that the magnet 31 does not directly contact the opening end face 10A.

  The mounting portion 33 is engaged with the fitting groove 20 d provided in the door 20 to fix the magnet gasket 30 to the door 20. The connecting portion 34 has flexibility and connects the magnet holding portion 32 and the mounting portion 33 so as to be stretchable. The heat insulating sheet 35 is provided on the surface of the magnet 31 excluding at least the “surface that comes into contact with the opening end surface 10A of the heat insulating box 10 via the magnet holding portion 32”. The reason why the surface in contact with the opening end face 10A is excluded from the installation range of the heat insulating sheet 35 in the magnet 31 is that the magnetic force (attraction force) acting between the magnet 31 and the opening end face 10A is due to the presence of the heat insulating sheet 35. This is so as not to decrease. Note that the heat insulating sheet 35 may be provided on a part of the surface of the magnet 31 that comes into contact with the opening end face 10A, as long as the required tightness and heat insulation by the door 20 can be ensured.

  The magnet holding portion 32, the attachment portion 33, and the connection portion 34 are integrally formed by molding a soft resin such as polyvinyl chloride into a long string shape. The magnet 31 is formed by mixing, for example, a magnet powder and a synthetic rubber, and has flexibility.

  Next, the structure of the magnet gasket 30 will be described in more detail with reference to FIGS. In the refrigerator 1 according to the present embodiment, when the magnet 31 is held by the magnet holding portion 32, the heat insulating sheet 35 is provided with the inside end surface portion 31a (the inside portion) of the magnet 31 and the door side flat portion 31b (the door side). Section).

  The inner side end surface portion 31a is a portion on the circumferential surface of the magnet 31 that is located inward in the width direction when the door 20 is closed. The door-side flat portion 31b is a portion on the peripheral surface of the magnet 31 on the door 20 side.

As the heat insulating sheet 35, a sheet material containing at least one of xerogel and aerogel can be used. For example, as the heat insulating sheet 35, for example, a sheet material containing at least one of silica xerogel and silica aerogel in which nanofibers having a fiber diameter of 50 nm or less are dispersed can be used. Silica xerogels and sheet material bearing at least one of silica airgel, low bulk density and 100~250kg / m ^3. Further, since the sheet material has fine pores smaller than the mean free path of air of 68 nm, it has a feature that solid heat conduction and heat conduction due to convection of air are reduced. For this reason, the sheet material has a low thermal conductivity of 0.02 W / mK when the thickness is about 0.1 mm. In addition, even if a pressing force is applied when the door 20 is closed, the heat insulating performance of the sheet material is unlikely to decrease, and as a result, the deterioration of the magnet gasket 30 can be suppressed for a long period of time.

  By providing such a heat insulating sheet 35 between the magnet 31 and the magnet holding part 32 and on the inside end face part 31a and the door-side flat part 31b of the magnet 31, the following effects can be obtained. . The heat from the heat radiating pipe 40 located on the outer side in the width direction than the magnet gasket 30 is transferred to the magnet 31 via the outer box 10a of the heat insulating box 10 and can be suppressed from being transferred to the inside of the box. Moreover, since the heat insulating sheet 35 has sufficient heat insulating performance even with a thickness of about 0.1 mm, it is not necessary to reduce the thickness of the magnet 31 by the thickness of the heat insulating sheet 35. Therefore, the adhesion to the entire periphery of the outer box 10a of the heat insulating box 10 can be secured without impairing the suction force to the heat insulating box 10.

  The above configuration secures the magnetic force (attraction force) acting between the magnet 31 and the opening end face 10A, and can maximize the heat insulation of the magnet 31 at the lowest cost. This will be described with reference to FIGS. 5A to 5C.

  FIG. 5A to FIG. 5C show that when the heat insulating sheet 35 having a thickness of 0.1 mm is provided on each peripheral surface of the magnet 31, the amount of heat that enters the periphery of the magnet gasket 30 from outside to inside the refrigerator during operation of the refrigerator. 3 shows the contents calculated by the thermal fluid simulation. FIG. 5A is a diagram illustrating a model region where a thermal fluid simulation is performed. In the thermal fluid simulation, the amount of heat that penetrates into a dotted line portion (portion for calculating the amount of penetrating heat) C shown in FIG. 5A is calculated. FIG. 5B is an enlarged view of the magnet peripheral portion M of FIG. 5A. FIG. 5C is a table showing the results of calculating the amount of heat that has penetrated into the refrigerator under each condition. In FIG. 5C, the amount of heat entering when the heat insulating sheet 35 is not provided around the magnet 31 is set to 100 (first row), but when the heat insulating sheet 35 is provided on various peripheral surfaces, It is shown.

  When the heat insulating sheet 35 is provided on the entire peripheral surface of the magnet 31 (the second row in FIG. 5C), the amount of heat that enters the inside of the refrigerator is the smallest. However, in this case, the heat insulating sheet 35 is provided with a thickness of 0.1 mm on the surface that comes into contact with the opening end surface 10A of the heat insulating box 10 via the magnet holding portion 32. Therefore, the distance between the magnet 31 and the opening end face 10A is 0.1 mm apart, and the magnetic force (attraction force) decreases. In order to compensate for this decrease in magnetic force by the thickness of the magnet, the thickness of the magnet 31 must be increased by 44%, and it is impractical to achieve this configuration.

  Further, the heat insulating sheets 35 are provided on three surfaces (the inner side surface 31a, the outer side surface 31d, and the door-side flat surface 31b) except for the surface that comes into contact with the opening end surface 10A of the heat insulating box 10 via the magnet holding portion 32. In the case (third line in FIG. 5C), and when the heat insulating sheet 35 is provided on two surfaces (the inner side surface 31a and the door-side flat surface 31b) except for the outer side surfaces 31c and 31d (the fourth line in FIG. 5C, 31a and 31b), there is no difference in the amount of penetrated heat. This is because the heat from the heat radiating pipe 40 is transferred to the magnet 31 through the outer box 10a of the heat insulating box 10 and is prevented from being transmitted to the inside of the refrigerator. This indicates that it is sufficient to provide the inner side surface and the door side flat surface. That is, it is shown that it is most efficient to provide the heat insulating sheet 35 on the above-mentioned two surfaces for low-cost production.

  In addition, when the installation surface of the heat insulating sheet is one surface (the door-side flat surface 31b) (the fifth line in FIG. 5C), the amount of heat entering the refrigerator is substantially different from the case where the heat insulating sheet 35 is not installed on the entire peripheral surface. There is no structure that enhances the heat insulation. Although not shown, the amount of heat entering the inside of the refrigerator when the heat insulating sheet 35 is installed only on the inner side surface 31a is also substantially different from the case where the heat insulating sheet 35 is not installed on the entire peripheral surface. There is no.

  In addition, as the heat insulating sheet 35, a sheet in which coating layers are provided on both surfaces of an airgel layer in which airgel particles are bonded by a rubber-based binder may be used. Such a heat insulating sheet is excellent in flexibility because the airgel particles are bonded by the rubber-based binder, and can be bent with a small radius of curvature. Note that it is preferable to use silica airgel as the airgel in order to achieve low thermal conductivity. In addition, when the amount of the rubber-based binder added is increased, the flexibility of the heat insulating sheet 35 can be improved, while the thermal conductivity of the heat insulating sheet 35 tends to increase. For this reason, it is preferable to minimize the amount of the rubber-based binder added.

  As a method of arranging the heat insulating sheet 35 between the magnet 31 and the magnet holding part 32, as shown in FIG. 4, the heat insulating sheet 35 is bonded and fixed to the magnet 31 in advance and then inserted into the magnet holding part 32. Can be manufactured. However, the present disclosure is not limited to this manufacturing method, and another known method may be used.

[2. Effect]
(1) According to the embodiment of the present disclosure, by providing the heat insulating sheet 35 on the peripheral surface of the magnet 31, the size of the magnet 31 from the magnet 31 to the magnet holding portion 32 can be increased without increasing the size of the magnet holding portion 32 and the magnet gasket 30. Heat conduction can be suppressed. Therefore, the heat insulating property of the magnet gasket 30 can be improved, and the intrusion of heat into the interior 10d can be suppressed.

  (2) Since the heat insulating sheet 35 is provided on the inner side end surface 31a of the magnet 31 and the door side flat portion 31b, it is possible to efficiently transmit heat to the inside 10d side through the magnet 31 from the outside of the warehouse. Can be suppressed.

  (3) Since the heat insulating sheet 35 is not provided on the opening end face 10A side of the heat insulating box 10, the magnetic force acting on the opening end face 10A from the magnet 31 does not decrease. Therefore, the door 20 and the opening end face 10A of the heat insulating box 10 can be effectively sucked by the magnet gasket 30.

  (4) Since the heat insulating sheet 35 is formed of a material containing xerogel or aerogel, the magnet holding portion can be made thinner than in the case where an air layer is provided, and the transfer of heat into the refrigerator can be efficiently suppressed. .

[3. Modification]
(1) In the refrigerator 1 of the present embodiment, the heat insulating sheet 35 is disposed on the two surfaces of the magnet 31, the door-side flat portion 31 b and the inner side end surface 31 a, but the present disclosure is not limited to this. For example, the heat insulating sheet 35 may be further provided on the outer side surface 31 d of the magnet 31, that is, a portion that is located on the outside in the width direction when the door 20 is closed.

  (2) FIG. 6 is a cross-sectional view showing a modification of the magnet in refrigerator 1 according to the present embodiment. The magnet 311 of the present modification is used instead of the magnet 31 in the magnet gasket 30 shown in FIGS. The magnet 311 is configured such that the radius of curvature of the heat insulating sheet 35 provided on the peripheral surface is increased so that the heat insulating sheet 35 can easily adhere to the magnet 311. Specifically, the magnet 311 is provided with a curved surface portion 311c between the door side flat portion 311b and the inner side end surface portion 311a. The magnet 311 is bent by bending the heat insulating sheet 35 along the curved surface portion 311c. The structure is such that the heat insulating sheet 35 is easily brought into close contact.

  By forming the curved surface portion 311c between the door side flat portion 311b and the inner side end surface portion 311a in this way, the heat insulating sheet 35 can be closely attached along the outer peripheral surface of the magnet 311 and the heat insulating performance by the heat insulating sheet 35 Can be increased.

  In this case, the radius of curvature of the curved surface portion 311c may be appropriately set according to the thickness and flexibility of the heat insulating sheet 35. Generally, if the radius of curvature is approximately the same as the thickness of the heat insulating sheet 35, the heat insulating sheet 35 can be bent along the curved surface portion 311c. For example, when the heat insulating sheet has a configuration in which silica airgel is uniformly embedded in the voids of the fiber sheet, a thickness of 0.1 mm can be realized. In the case of this thickness, the radius of curvature of the curved surface portion 311c may be set to 0.1 mm or more. In addition, as the curved surface portion 311c, for example, a continuous curved surface portion from the center position of the door-side flat portion 311b in the width direction (the left-right direction in FIG. 5) to the upper end portion of the inner side end surface portion 311a may be used.

  When the heat insulating sheet 35 is also provided on the outside end surface 311d, a curved surface may be provided between the door side flat portion 311b and the outside end surface 311d.

  INDUSTRIAL APPLICABILITY The present disclosure can contribute to energy saving by improving the heat insulating performance between a heat insulating box and a door, and can be applied to various refrigerator fields for storing refrigerated and frozen products.

1 refrigerator (cooling device)
DESCRIPTION OF SYMBOLS 10 Insulated box 10A Open end face 10a Outer box 10b Inner box 10c Insulated member 10d Storage space 11 Refrigerator room 12 Second freezer room 13 Ice making room 14 First freezer room 15 Vegetable room 20 Door 20a Door outer plate 20b Door inner plate Reference Signs List 20c Insulation member 20d Fitting groove 21 Refrigerator compartment right door 22 Refrigerator compartment left door 23 Second freezer compartment door 24 Ice making compartment door 25 First freezer compartment door 26 Vegetable compartment door 30 Magnet gasket 31, 311 Magnet 31a Storage compartment inner side 311a Inner end face (inner side)
31b Door side plane 311b Door side plane part (door side part)
31c Outer warehouse side surface 311c Curved surface part 31d Outer warehouse side surface 311d Outer warehouse outer end surface part 32 Magnet holding part 33 Attachment part 34 Connection part 35 Heat insulation sheet 40 Heat dissipation pipe C Intrusion calorie calculation part M Magnet peripheral part

Claims (11)

A heat-insulating box having a storage space that opens forward, surrounding the opening and having an opening end face facing forward;
A door attached to the heat-insulating box that allows the opening to be opened and closed,
A magnet holding portion attached to an inner peripheral portion of the door facing the opening end surface in a state where the opening is closed, and holding a magnet and the magnet,
In a closed state in which the door closes the opening between the magnet and the magnet holding portion,
Of the circumferential surface of the magnet, a side portion on the door side, and a heat insulating sheet provided on a side portion facing inward in the width direction in the closed state,
And a magnet gasket having
Cooling system. In the heat-insulating box, a radiator located outside the magnet in the width direction in the closed state is incorporated.
The cooling device according to claim 1. On the peripheral surface of the magnet, a curved surface portion was provided between the door side portion and the inside of the refrigerator,
The cooling device according to claim 1. The heat insulating sheet is formed of a material containing xerogel or aerogel,
The cooling device according to claim 1. A magnet,
A magnet holding unit for holding the magnet,
A heat insulating sheet provided between the magnet and the magnet holding portion,
Magnet gasket. A heat-insulating box having a storage space that opens forward, surrounding the opening and having an opening end face facing forward;
A door attached to the heat-insulating box so that the opening can be opened and closed,
The magnet gasket according to claim 1, which is attached to an inner peripheral portion of the door facing the opening end surface when the opening is closed.
Cooling system. On the peripheral surface of the magnet, the heat insulating sheet is provided, except for at least a surface facing the opening end surface in the closed state where the door closes the opening,
The cooling device according to claim 6. The heat insulating sheet is provided on the door side and the inside of the refrigerator, of the peripheral surface of the magnet,
The door side part is a part on the door side,
In the closed state, the internal compartment is a portion that faces inward in the width direction.
The cooling device according to claim 6. In the heat-insulating box, a radiator located outside the magnet in the width direction in the closed state is incorporated.
The cooling device according to claim 8. On the peripheral surface of the magnet, a curved surface portion was provided between the door side portion and the inside of the refrigerator,
The cooling device according to claim 8. The heat insulating sheet is formed of a material containing xerogel or aerogel,
The cooling device according to claim 6.

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