JP2008106816A - Door device and refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door device capable of maintaining heat insulating performance of a heat insulating box for a long period of time by reducing a heat intrusion amount from a gasket. <P>SOLUTION: The door device 1 is provided with a door arranged in an interior opening of the heat insulating box, and the gasket 10 provided on an interior side rim face of the door and adhering to an opening front rim of the heat insulating box when the door is closed. A vacuum heat insulating body 16 comprised by covering a core material by a gas barring skin material and decompressing a skin material interior wherein skin materials are overlapped in portions other than longitudinal both ends and there are no fin portions protruding outward, is provided in the gasket 10. Since a seal length becomes short with respect to the size of the vacuum heat insulating body 16, an outside air intrusion amount from a seal portion is reduced, superior heat insulating performance can be maintained for a long period of time, insertion of the vacuum heat insulating body 16 into the gasket 10 is easy, heat insulating performance of the gasket 10 part is significantly improved, exchange of heat between the interior and exterior of the heat insulating box is suppressed, and heat retaining or cold insulating performance of the heat insulating box is improved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a door device that seals and opens an opening of a heat insulating box and a refrigerator that includes the door device.

  Conventionally, a gasket is attached to the inner edge of the refrigerator door so as to surround the periphery of the refrigerator door, and when the door is closed, the sealed state is maintained well, and the cool air inside the refrigerator leaks to the outside, Prevents outside air from entering the cabinet.

  A conventional refrigerator door is formed of a vinyl chloride-based molded product and is in close contact with the refrigerator main body by a magnet (see, for example, Patent Document 1). Moreover, there exists what inserted the heat insulating material and the composite heat insulating material of the airgel and the fiber structure in the inside of a gasket (for example, refer patent document 2).

  FIG. 4 is a perspective view of a refrigerator using the conventional door device described in Patent Document 1, and FIG. 5 is a cross-sectional view of a main part of the conventional door device described in Patent Document 1. .

  As shown in FIG. 4, the refrigerator main body 50 is provided with a rotary refrigerating room door device 51, a drawer-type freezer compartment door device 52, and a drawer-type vegetable compartment door device 53 at the front opening.

  Since the basic structure of these door devices is the same except for the dimensions, the cold room door device 2 will be described as an example with reference to the cross-sectional view of the main part of FIG.

  The refrigerator compartment door device 51 includes a metal surface plate 55 in which the left and right sides 54 are bent, a gasket attachment sash 56 formed by extrusion inserted into the left and right sides 54 of the metal surface plate 55, and the metal surface plate 55. It is framed by a handle (not shown) and a cap (not shown) of an injection-molded product made of synthetic resin inserted in the upper and lower sides.

  A foam heat insulating material 60 is injected between the frame, the reinforcing plate 58 fixed to the flange 57 of the extruded gasket mounting sash 56, and the door back plate 59. Furthermore, a gasket 62 is fitted into a gasket mounting sash 56 formed by extrusion molding and a gasket mounting groove 61.

  The gasket 62 is generally extruded by soft polyvinyl chloride, and the insertion portion 63 inserted into the gasket mounting groove 61 is thick. In addition, the gasket 62 is usually formed by mixing and molding a chlorinated polyolefin rubber and a ferrite magnetic powder, a magnet band 64, a first bag portion 65a for storing the magnet band 64, a cushion, and the like. The second bag portion 65b, the hollow bag portion 66, and the fin portion 67 have an air chamber for heat insulation. The soft polyvinyl chloride in these portions is thin.

  Further, the iron box outer box 68 of the refrigerator main body 50 to which the gasket 62 is in close contact forms an inward flange portion 69 by bending, and the sponge 71 is in close contact with the inner box 70 formed of ABS resin or PS resin. It is fastened with. Further, a foam heat insulating material 60 is injected between the outer box 68 and the inner box 70 in the same manner as the refrigerator compartment door 51.

  The magnet band 64 of the gasket 62 is attracted to the inward flange portion 69 when the refrigerator door device is closed, thereby forming a sealed structure together with the refrigerator body to prevent the leakage of cold air from the refrigerator.

  Although depending on the configuration of the heat insulating box, the number of doors, and the like, heat intrusion from the gasket 62 which is a seal portion between the door and the heat insulating box accounts for 20 to 30% of the whole heat insulating box. As in Patent Document 1, an air layer is provided on the gasket 62 to prevent heat from entering, but this is not sufficient.

  Moreover, in the structure of patent document 2, the composite heat insulating material of an airgel and a fiber structure is inserted in the hollow part of the gasket.

Moreover, there exists a vacuum heat insulating material (thermal conductivity 0.001-0.006 W / m * K) as a heat insulating material which has high heat insulation performance (for example, refer patent document 3).
JP-A-7-253269 JP 2004-340420 A JP 2000-104889 A

  However, in the conventional door device described in Patent Document 1, the amount of heat entering from the outside air increases through the gasket 62 as the number of doors is increased, the heat insulation / cooling performance is lowered, and energy is consumed like a refrigerator. Insulated boxes increase the amount of electrical energy used and promote global warming.

  Further, in the conventional door device described in Patent Document 2, it is difficult to arrange and insert a porous material such as airgel into the shape of a hollow portion, and the thermal conductivity is 0.010 to 0.012 W. / M · K, which is not sufficient heat insulation performance.

  In addition, the conventional vacuum heat insulating material described in Patent Document 3 has a porous or fibrous core material inside, and is covered with a high gas barrier outer covering material such as an aluminum foil laminate film, and the inside is evacuated and sealed. However, the laminate film formed when the laminate films are welded to each other must be overlapped with each other to protrude outward, and to cover the core material, an excess portion of the laminate film is necessarily required. Normally, when used as a plate-like heat insulating material, it does not have a significant effect, but when a long and narrow shape such as that used in a gasket is required, a continuous fin along the longitudinal direction in which the jacket materials overlap and protrude outward This prevents the portion from being inserted into the gasket, and the amount of gas entering from the welded portion of the fin portion continuous along the longitudinal direction increases, resulting in a decrease in heat insulation performance. Further, when a metal foil such as an aluminum foil is used, there is a problem that so-called wraparound heat conduction that propagates through the surface metal foil becomes large.

  This invention solves the said conventional subject, and it aims at providing the door apparatus which can reduce the heat penetration | invasion amount from a gasket, and can maintain the heat insulation performance of a heat insulation box for a long period of time.

  In order to achieve the above object, the present invention provides a door disposed at an inner opening of a heat insulating box, and a gasket that is provided on the inner edge of the door and is in close contact with the front edge of the opening of the heat insulating box when the door is closed. In the gasket, the core material is covered with a gas barrier outer covering material, the inner portion of the outer covering material is decompressed, and the outer covering materials overlap each other at both ends in the longitudinal direction and protrude outward. A heat insulator without a fin portion is provided.

  The said structure WHEREIN: By providing the heat insulating body which has high heat insulation performance by decompressing in a gasket, the amount of heat | fever penetration | invasion from a gasket is reduced and the heat insulation / cold insulation performance of a heat insulation box is improved. Furthermore, it is easy to insert the heat insulator into the gasket in the longitudinal direction by having a configuration in which the jacket materials are overlapped with each other except for both ends in the longitudinal direction of the heat insulator and projecting outward. It is possible to prevent the outside air from entering into the heat insulating body from the fin portion continuous along the insulating portion, to prevent the heat insulating performance from being lowered, and to provide a highly reliable door device.

  Further, in order to achieve the above object, the present invention provides a door disposed at the opening inside the box of the heat insulation box, and is closely attached to the front edge of the opening of the heat insulation box provided at the inner edge of the door when the door is closed. And the gasket covers the core material with a gas barrier outer covering material and depressurizes the inner portion of the outer covering material, and the outer covering materials overlap each other at both ends in the longitudinal direction and protrude outward. It is characterized by being comprised with the heat insulating body without the fin part which did.

  The said structure WHEREIN: By using the heat insulating body which has high heat insulation performance by reducing pressure as a gasket, the amount of heat | fever penetration | invasion from a gasket is reduced and the heat insulation / cold insulation performance of a heat insulation box is improved. Furthermore, it is excellent in appearance by having a configuration in which there is no fin portion that is overlapped with each other other than the both ends in the longitudinal direction of the heat insulator and protrudes to the outside, and from the fin portion that is continuous along the longitudinal direction. Intrusion of outside air is prevented, heat insulation performance is prevented from being lowered, and a highly reliable door device can be obtained.

  The door device of the present invention improves the heat insulation performance of the gasket, reduces the heat intrusion flow from the gasket portion that has a large amount of heat intrusion from the outside in the heat insulation box, and improves the heat insulation / cold insulation effect. In addition, it is easy to insert the vacuum heat insulating material into the gasket and to make the longitudinal direction in the longitudinal direction by making the structure of the heat insulating material without the fin portion protruding outside by overlapping the covering materials other than both ends in the longitudinal direction. It is possible to prevent the outside air from entering from the fin portions that continue along the door, prevent the heat insulation performance from being lowered, and make the door device highly reliable.

  The invention of the door device according to claim 1 of the present invention is the door disposed in the interior opening of the heat insulation box and the front edge of the opening of the heat insulation box provided on the inner edge of the door when the door is closed. And the gasket is covered with a gas barrier outer covering material, and the outer covering material is depressurized, and the outer covering materials overlap each other at both ends in the longitudinal direction. A heat insulator having no fin portion protruding outward is provided.

  In the present invention, the heat insulation performance of the gasket part is greatly improved by inserting a heat insulating body whose inside is reduced in pressure into the gasket part, and heat entry and exit between the heat insulation box body and the outside is suppressed, and the heat insulation box body Improve heat insulation or cold insulation performance.

  In addition, the heat insulation body has a structure in which there are no fin portions that are overlapped with each other except for both ends in the longitudinal direction and protrude outward, so that when the fin is installed inside the gasket, the fin portions that continue along the longitudinal direction Installation is easy without being caught.

  In order to have a structure in which the outer cover materials overlap each other except for both ends in the longitudinal direction of the heat insulator and there is no fin portion protruding outward, a molding method such as blow molding, extrusion molding, injection molding, differential pressure molding, etc. Can be made by making a hollow columnar container by combining welding techniques such as ultrasonic, vibration, heat, laser, friction, etc., alone or in combination, filling the core with the core material, sealing after decompression, etc. is there.

  Moreover, in order to make a heat insulating body into the shape which can be installed in a gasket, if it is a general gasket, it will become an elongate structure. Therefore, in the case of a heat insulator that has a fin portion that is continuous along the longitudinal direction, that is, in the case of a heat insulating body that is sealed and welded along the longitudinal direction, the seal length becomes longer with respect to the area of the heat insulating body. Therefore, the performance of the heat insulator is excellent in reliability because there is no fin portion protruding outside by overlapping the covering materials other than both ends in the longitudinal direction.

  The cross section of the columnar container may be a cylinder, a quadrangular column, or a triangular column, and the thickness need not be constant.

  Moreover, if it is bent so as to conceal a fin portion that continues along the longitudinal direction, the bending angle of the bent portion increases, and bag breakage is likely to occur.

  The core material is not particularly limited as to the material system, and is not particularly limited to organic or inorganic fibers, powder, solidified powder, foamed resin, and the like.

  For example, in the case of a core material using fiber, inorganic fiber such as glass wool, glass fiber, alumina fiber, silica alumina fiber, silica fiber, rock wool, silicon carbide fiber, natural fiber such as cotton, synthetic fiber such as polyester and nylon Known materials such as organic fibers can be used.

  In order to use the fiber, there are methods such as compression or heat compression of the fiber, compression or heat compression using water or a binder, needling, spunlace, and papermaking.

  On the other hand, in the core material using a powder, an inorganic powder such as silica, pearlite, carbon black, an organic powder such as a synthetic resin powder, or a mixture thereof is filled with the powder as it is, or a breathable bag. There are methods such as filling in and using, or solidifying with a fiber binder or an inorganic or organic liquid binder.

  In the foamed resin, urethane foam, phenol foam, styrene foam, or the like can be used.

  Moreover, the invention of the door apparatus of Claim 2 is provided in the opening inner edge of the door of the said heat insulation box, and the door arrange | positioned in the opening in the warehouse of the heat insulation box, and the opening front edge of the said heat insulation box at the time of closing. The gasket is covered with a gas barrier outer covering material, and the outer covering material is decompressed and the outer covering materials are overlapped on the outside except for both ends in the longitudinal direction. It is characterized by comprising a heat insulator without protruding fins.

  In the present invention, by making the gasket itself a heat insulating body whose inside is reduced in pressure, heat insulation of the gasket portion can be remarkably improved, heat entering and leaving inside and outside of the heat insulating box body is suppressed, and the heat insulating box body Improves heat insulation or cold insulation performance.

  In order to obtain a structure in which the outer cover materials are overlapped with each other except for both ends in the longitudinal direction of the heat insulator and there is no fin portion protruding outward, a molding method such as blow molding, extrusion molding, injection molding, differential pressure molding, and the like Can be made by making a hollow columnar container by combining welding techniques such as ultrasonic, vibration, heat, laser, friction, etc., alone or in combination, filling the core with the core material, sealing after decompression, etc. is there.

  Moreover, in order to make a heat insulating body into the shape of a gasket, if it is a general gasket, it will become an elongate structure. Therefore, in the case of a heat insulator that has a fin portion that is continuous along the longitudinal direction, that is, in the case of a heat insulating body that is sealed and welded along the longitudinal direction, the seal length becomes longer with respect to the area of the heat insulating body. Therefore, the performance of the heat insulator is excellent in reliability because there is no fin portion protruding outside by overlapping the covering materials other than both ends in the longitudinal direction.

  The cross section of the columnar container may be a cylinder, a quadrangular column, a triangular column, or a polygonal column, and is not particularly limited. Also, the thickness need not be constant.

  Further, the door portion is one of the most easily spotted parts when opening and closing the door device, and if there is a fin portion continuous along the longitudinal direction, the appearance is inferior. If the structure is such that there are no fin portions that are overlapped with each other other than the longitudinal ends of the heat insulator and project outward, the appearance is neat.

  The invention of the door device according to claim 3 is characterized in that in the invention of claim 2, an elastic material is bonded to both sides or one side of the gasket.

  In the present invention, since the heat insulator itself whose pressure is reduced is inferior in elasticity, when the door device is closed, an impact is easily transmitted, which causes deformation and bag breakage. Therefore, by sticking an elastic material to one side or both sides of the heat insulator, the impact is weakened, the adhesion between the door and the heat insulation box is increased, the reliability of the gasket is increased, and the heat insulation / cooling performance is improved.

  The elastic material is not particularly limited, but may be one having elasticity due to material characteristics such as rubber-based material or soft resin, or one having structural elasticity such as a bellows structure or a spring structure.

  Further, if the pasting part is attached to a part of each side of the door, the impact is weakened, but a gap is formed in the gasket.

  It is also possible to use an elastic material for the jacket material of the heat insulator, but the elastic material is structurally easy to permeate gas and cannot be used for the jacket material itself. Therefore, the gas barrier material is used as the core material. Any structure can be used as long as it has an elastic material layer on the side.

  According to a fourth aspect of the present invention, there is provided the door device according to any one of the first to third aspects, wherein the outer cover material is made of a multilayer resin material formed by extrusion molding. It is characterized by.

  If an AL laminate film or the like is used as the jacket material, the gas barrier property of the film itself is very good, but intrusion from the weld surface becomes a problem, and metal materials such as AL heat through the AL surface layer. There is a problem of increased conduction. In order to prevent this, the outer cover material is made of a low heat conductive material such as a resin material, and a normal resin has a low gas barrier property and cannot maintain a degree of vacuum. Therefore, a resin material having a high gas barrier property may be used. However, the high gas barrier resin has a problem that the material cost is higher than that of a general-purpose plastic, and depending on the material, there is also a problem that the gas barrier property is high but it is weak against moisture. Therefore, it becomes possible to add other functions, such as a material cost reduction by using a multilayer structure, and improvement of water resistance.

  Further, when trying to join the multilayer resin materials, since there is no gas barrier property in physical joining, welding such as heat, vibration, laser, and ultrasonic waves and an adhesive are required. However, if such a measure is taken, the welded surface is disturbed during welding, so that the gas barrier layer is broken and the gas barrier property is lowered. In particular, in a heat insulating body having an elongated structure with a large welding surface, the gas barrier property is greatly lowered. The same applies to the adhesive because the gas barrier property of the adhesive itself is not sufficient.

  On the other hand, if it is formed by extrusion molding, it is possible to form a tube-like long and narrow resin without overlapping fin parts protruding outside, except for both ends in the longitudinal direction, and multilayer by coextrusion It is also easy to make. With such a configuration, it is only necessary to join the upper and lower portions that are formed to be long and thin, and it is possible to maintain the degree of vacuum by minimizing the joining, and the heat insulation performance can be maintained.

  The invention of the door device according to claim 5 is the invention according to any one of claims 1 to 4, wherein the jacket material is an ethylene-vinyl alcohol copolymer, polyacrylonitrile, polyamide. 6, polyamide 11, polyamide 12, polybutylene terephthalate, polyethylene terephthalate, polybutylene naphthalate, polyethylene naphthalate, polyvinylidene fluoride, polyvinylidene chloride, ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene, polyphenylene sulfide At least one selected from the group consisting of polyetheretherketone, polyimide, polyetherimide, and polyphenylene oxide is used as a material.

  These materials are materials having particularly high gas barrier properties among the high gas barrier resins, and can maintain the performance of the heat insulator for a long period of time, have high heat insulation performance, and have excellent heat insulation / cooling performance.

Further, the invention of the door device according to claim 6 is the invention according to any one of claims 1 to 5, wherein the jacket material is made of metal, SiO ₂ , Al ₂ O ₃ , diamond-like It is characterized in that at least one of the group consisting of carbon is deposited.

  Thereby, the gas barrier property of a vacuum heat insulating material further improves, reliability improves, and the reliability of the heat insulation / cooling performance of the heat insulation box using the door apparatus which equipped this heat insulating body in the gasket part also improves.

  Since these materials do not have gas permeability, vapor deposition can improve gas barrier properties and improve water resistance and chemical resistance.

  The vapor deposition surface may be either inside or outside the heat insulator, and of course may be vapor deposited on both sides.

  In the case of metal vapor deposition, since the thermal conductivity of the metal is high, the surface thermal conductivity is increased. Therefore, when vapor deposition is performed on the outside of the heat insulator, it is preferable to provide a discontinuous configuration and provide a thermal barrier.

  Further, the invention of the door device according to claim 7 is characterized in that the core material according to any one of claims 1 to 6 is made of dry silica having an average primary particle diameter of 100 nm or less, an average fiber An inorganic fiber material having a diameter of 10 μm or less is formed by mixing and pressing so that the content of the inorganic fiber material in the core material is 0.5 to 40 wt%. It is.

  The core material is more advantageous than the fiber material in order to obtain long-term reliability because the powder material in which the air gap distance is shorter is more excellent in pressure dependency. However, in order to pack a powder material having a low density in a tube-like elongated casing such as a gasket, a process that requires a great number of steps such as decompression and pressure compression is required. Therefore, it is desirable in the process that the powder material is solidified and sealed. As a powder material, a silica-based material is excellent as a core material for a vacuum heat insulating material.

  As a solidification means, a general silica powder and a fiber material are mixed and stirred, and even if pressure-molded, it does not become a molded body, but a dry silica having an average primary particle size of 100 nm or less and a fiber material are mixed, A compact can be formed by pressure molding. This may be due to the fact that powders with small particle diameters cause intermolecular forces to act and the powders adhere to each other, or because they are dry, the surface functional groups are few and the mutual repulsion is so small that the powders are likely to adhere to each other. Therefore, in order to produce a molded body by a molding method such as pressurization, it is necessary to use dry silica having an average primary particle diameter of 100 nm or less and a fiber material.

  In addition, by setting the inorganic fiber material to an average fiber diameter of 10 μm or less, the specific surface area is increased because the fiber diameter of the inorganic fiber is small, that is, the surface energy is increased and the powder is easily combined with the powder. It is conceivable that it is easy to adhere to each other because of a good affinity with the material, or due to their interaction. Therefore, when forming a molded body by a molding method such as pressurization, the average fiber diameter is 10 μm or less. By using an inorganic fiber material, a stronger molded body can be produced.

  Further, by using dry silica having a very fine particle diameter and an inorganic fiber material having a small fiber diameter, a molded body having almost no dusting can be obtained. This is because, as described above, the intermolecular force between powders with small particle diameters, adhesion between powders due to a small number of surface functional groups, good affinity between silica and inorganic fibers, large surface energy of fine fiber materials, etc. Can be considered.

  In addition, a strong molded body can be obtained by the above combination, and a molded body having flexibility can be obtained because it has elasticity.

  The reason for this is considered to be that since the fibers having an average fiber diameter of 10 μm or less are used, flexural elasticity is improved and flexibility can be obtained.

  The reason why the fiber addition amount is set to 0.5 to 40 wt% is that if the addition amount is too small, the shape of the molded body cannot be maintained, and if it is too large, the heat insulation performance becomes dependent on the fiber and the heat insulation performance is deteriorated. .

  The invention of the door device according to claim 8 is characterized in that, in the invention according to claim 7, 1 to 30 wt% of carbon black is mixed with the core material.

  Thereby, heat insulation performance improves rather than the vacuum heat insulating material using the conventional silica powder molded object, and the heat insulation / cold insulation performance of the heat insulation box using the door apparatus which equipped this heat insulating body in the gasket part improves.

  For example, carbon black and titanium oxide are known to work as radiation inhibitors at high temperatures as powders added to silica to improve thermal insulation performance. It is done. Although this reason is not certain, it is considered that solid heat conduction is reduced by some action of silica powder and carbon black.

  The addition amount of the powdery carbon material is preferably 1 to 30 wt%. This is because if the addition amount is too small, there is no effect of improving the heat insulation performance, and if it is too large, the heat insulation performance becomes dependent on the powdered carbon material and the heat insulation performance deteriorates, or gas generation increases under reduced pressure. This is because the heat insulation performance deteriorates.

  The invention of a door device according to claim 9 is the invention according to any one of claims 1 to 8, wherein a gas adsorbent is included in the heat insulator. Is.

  By including the gas adsorbent, the degree of vacuum is maintained, and the chemical vacuum pump contributes to a reduced pressure action.

  If a core material with a long tube shape such as a gasket and a high exhaust resistance such as a powder core material is used, a physical decompression such as a vacuum pump will increase the process time. . Thus, roughing with a vacuum pump, and after sealing, the pressure can be reduced by two stages with an adsorbent to simplify the process.

  The type of adsorbent is not particularly limited, and the adsorption mechanism may be any of physical adsorption, chemical adsorption, occlusion, sorption, etc., but a substance that acts as a non-evaporable getter is good.

  Specifically, it is a physical adsorbent such as synthetic zeolite, activated carbon, activated alumina, silica gel, dosonite, hydrotalcite, metal complex and the like.

  As the chemical adsorbent, alkali metal or alkaline earth metal oxides, alkali metal or alkaline earth metal hydroxides, etc. can be used, and in particular, lithium oxide, lithium hydroxide, calcium oxide, calcium hydroxide, Gnesium acid, magnesium hydroxide, barium oxide and barium hydroxide are effective.

  In addition, calcium sulfate, magnesium sulfate, sodium sulfate, sodium carbonate, potassium carbonate, calcium chloride, lithium carbonate, unsaturated fatty acid, iron compound and the like also act effectively.

  In addition, it is more effective to apply a getter material obtained by singly or alloying materials such as barium, magnesium, calcium, strontium, titanium, zirconium, vanadium, and lithium.

  Moreover, invention of the refrigerator of Claim 10 is a refrigerator using the door apparatus as described in any one of Claims 1-9, Thereby, providing a refrigerator with little power consumption. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a cross-sectional view of a main part of the door device according to Embodiment 1 of the present invention, and FIG. 2 shows a cross-sectional view of a vacuum heat insulator used in the door device of the same embodiment.

  In FIG. 1, a door device 1 is a door device 1 for a refrigerator compartment of a refrigerator, and is a metal surface plate 2 bent on the left and right sides and an extrusion inserted into the left and right sides 3 of the metal surface plate 2. A gasket mounting sash 4 formed by molding and a handle (not shown) and a cap (not shown) of an injection molded product made of synthetic resin inserted on the upper and lower sides of the metal surface plate 2 are framed.

  A foam heat insulating material 8 is injected between this frame, the reinforcing plate 6 fixed to the flange 5 of the extruded gasket mounting sash 4, and the door back plate 7. Further, a gasket 10 is fitted into the gasket mounting sash 4 formed by extrusion molding and the gasket mounting groove 9.

  The gasket 10 is generally extruded by soft polyvinyl chloride, and the insertion portion 11 inserted into the gasket mounting groove 9 is thick. In addition, the gasket 10 is generally composed of a magnet band 12 formed by mixing chlorinated polyolefin rubber and ferrite magnetic powder and extruded, a first bag portion 13a for storing the magnet band 12, and a cushion. It has a structure having a second bag portion 13b, a hollow bag portion 14 and a fin portion 15, and an air chamber for heat insulation. The soft polyvinyl chloride in these portions is thin. A vacuum heat insulator 16 is installed inside the hollow bag portion 14.

  Further, the iron box outer box 17 of the refrigerator main body to which the gasket 10 is in close contact is formed with an inward flange portion 18 by bending, and the sponge 20 is in close contact with the inner box 19 formed of ABS resin or PS resin. It is fastened. Further, the foam heat insulating material 8 is injected between the outer box 17 and the inner box 19 in the same manner as the door device 1.

  And the magnet strip | belt 12 of the gasket 10 forms an airtight structure with a refrigerator main body by adsorb | sucking to the inward flange part 18 when the door apparatus 1 is closed. And the heat insulation of the vacuum heat insulating body 16 is superior to the air heat insulation, the heat insulation performance is higher than the heat insulation effect of the gasket 10 alone, the leakage of cold air from the refrigerator is prevented, the heat absorption is reduced, and the gasket 10 is obtained. It is possible to prevent dew condensation.

  In FIG. 2, the vacuum heat insulator 16 includes a jacket material 21 having a high gas barrier property, a porous core material 22 having a high porosity, a gas adsorbing material 23 that adsorbs air components, and a moisture adsorption that adsorbs moisture. The core material 22, the gas adsorbing material 23, and the moisture adsorbing material 24 are covered with a gas barrier outer covering material 21, and the inner portion of the outer covering material 21 is decompressed. 21 is a heat insulator that has no fins that overlap each other and protrude outward. The jacket material 21 has a multilayer structure having a high gas barrier layer 25 and a protective resin layer 26.

  The jacket material 21 is formed into a tube shape by extrusion molding, and one side is sealed by thermal welding to form a welded portion 27. After that, the core material 22 is sealed while being pressurized in the space formed by the jacket material 21. After the sealing, the inside of the jacket material 21 is depressurized to a predetermined pressure of 130 Pa or less, and the side used for depressurization is sealed. The opening which has not been stopped is sealed, and the vacuum heat insulating body 16 is produced.

  In this embodiment, the door device for the refrigerator compartment of the refrigerator is taken as an example, but any box body that has a temperature difference between the internal temperature and the outside air temperature and requires heat insulation may be used. Of course, the same effect can be obtained even in the case of a heat storage where the inside temperature is higher than the outside air temperature.

  Further, although the magnet band 12 is used to bring the door into close contact with the box, it may be a compression force, a pulling force, a magic tape (registered trademark), an adhesive substance, or the like, and is not limited thereto.

  Further, a plurality of door devices 1 may be provided in one box body, and it is more effective to install the vacuum heat insulating body 16 in the gasket 10 of each door device 1. Further, it is more effective to install the gasket 10 around the entire periphery of each door and to install the vacuum heat insulator 16 on each side.

  Further, the shape of the gasket 10 is not limited, and the shape and size of the bag portions 13a and 13b, the hollow bag portion 14 and the fin portion 15 are not limited as long as they have a cushioning property and an effect of blocking outside air.

  Moreover, in order to improve reliability as the vacuum heat insulating body 16, a material having a high gas barrier property is required as a material structure. If it is made of a metal material, almost no gas passes, so that high reliability can be obtained. However, since the surface of the metal jacket material becomes a thermal bridge and reduces the heat insulation performance, it is more preferable that the structure includes a resin material having a high gas barrier property from the viewpoint of improving the heat insulation performance.

  Specific resin materials include ethylene-vinyl alcohol copolymer, polyacrylonitrile, polyamide 6, polyamide 11, polyamide 12, polybutylene terephthalate, polyethylene terephthalate, polybutylene naphthalate, polyethylene naphthalate, polyvinylidene fluoride, polyvinylidene chloride , Ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene, polyphenylene sulfide, polyether ether ketone, polyimide, polyether imide, and polyphenylene oxide are preferable.

  In addition, ester-based and amide-based resins such as ethylene-vinyl alcohol copolymer tend to have poor gas barrier properties under moisture and high humidity. Therefore, a water-resistant resin that is resistant to moisture and humidity, for example, an olefin-based resin, a fluorine-based resin, or the like is used in a multilayer structure, and the moisture contact side is a water-resistant resin, which is preferable because reliability is improved. In addition, there is no problem with the number of layers, and any resin that is difficult to adhere may be provided with an adhesive layer.

In addition, in order to improve gas barrier properties, vapor deposition of metal, SiO ₂ , Al ₂ O ₃ , diamond-like carbon or the like on the resin surface can remarkably improve gas barrier properties and water resistance. The thickness is effective at 1 nm or more, and preferably 0.01 μm to 50 μm. Further, a deposit of an inorganic compound is preferable to a metal because it has a lower solid thermal conductivity.

Also, there is no problem even if the vacuum evaporation method is used for the vapor deposition method, but if it is a plasma ion implantation film formation, even if it is an inorganic film such as SiO ₂ , Al ₂ O ₃ , diamond-like carbon, etc., the film thickness can be increased to 50 μm. It is possible and preferable because of high adhesion.

  In addition, it is more preferable to mix fluorine-like element into diamond-like carbon because flexibility and gas barrier properties are improved.

  Further, there is no limitation on the manufacturing method of the vacuum heat insulating body 16 that has no fin portions that are overlapped with each other other than the both ends in the longitudinal direction and project outward, but the jacket material 21 is formed by extrusion molding or injection molding. It is preferable to form by.

  Specifically, in the case of multi-layer extrusion, a resin material is fed into a heating cylinder (barrel) with an extruder such as a screw or plunger, heated and fluidized, and a die at the tip (a gold with a cross-sectional hole for material passage). A long product such as a tube is produced by passing the mold) and giving it a shape, which is cooled and solidified with water or air. A multilayer tube can be produced by connecting a plurality of extruders and combining multiple resins. It is also possible to produce an irregular shaped product from the extruded product by blow molding. Depending on the shape of the die, molded products with various cross-sectional shapes such as films, sheets, pipes, profiles (deformed materials) can be produced.

  Next, as a method of injection molding of a multilayer structure, two or more resins are injected into one cavity composed of a fixed male mold and female mold. A multilayer molded product can be obtained by repeating the injection in the cavity.

  More specifically, the first resin to be the innermost and outer layers having moisture resistance and blade resistance is injected into the mold cavities in a desired amount that does not satisfy the total cavities capacity, and then the center of the first resin is solidified. In addition, a desired amount that does not satisfy the total cavity capacity is injected even when the second resin, which is a resin layer having a high gas barrier property, is combined with the first resin amount while in a fluid state.

  The second resin is injected into the first resin by this injection process. Next, the third resin heated to a temperature sufficiently higher than the flow start temperature (or melting point) of the second resin is injected while the central portion of the second resin is not solidified and is in a fluid state. At this time, it is preferable that the thickness around the cavity is not so thick and that the injection pressure and the injection speed are high. By changing the resin type and the number of injections, the characteristics and the number of layers can be changed.

  The method for encapsulating the core material in the jacket material 21 is not particularly limited, but it is desirable that the fiber material such as glass wool is molded and encapsulated so that the fiber directions are aligned in the longitudinal direction. This is because the solid thermal conductivity in the fiber direction is high. Further, since the fiber material emits less outgas from the material itself, inorganic fiber is preferable to organic fiber. Although the molding method varies depending on the material type, heat molding or molding with a binder is preferable.

  Further, when the core material is powder, it is possible to seal one of the jacket materials and fill it while applying pressure. At this time, it is possible to densely fill the powder by filling the inside of the molded product or the entire atmosphere while reducing the pressure. It is also possible to enclose the powder inside a nonwoven fabric or the like to prevent scattering.

  The powder core material preferably has an average primary particle size of 100 nm or less. This is a mean free path of gas as a physical property that affects the heat insulation performance when heat is conducted with air interposed. The mean free path of a gas is the distance traveled until one of the molecules that make up the air collides with another molecule. If the void formed is larger than the mean free path, the molecules in the gap Collide and heat conduction by gas occurs, so that the thermal conductivity increases. The heat insulation principle of a vacuum heat insulator is to eliminate as much air as possible to transfer heat and reduce heat conduction by gas. On the other hand, when the void is smaller than the mean free path, the thermal conductivity is small. This is because there is almost no heat conduction due to air collision.

  In addition, the material is preferably an inorganic powder because of less outgassing, and is particularly preferably silica powder because of excellent heat insulation performance.

  Furthermore, the powder core material can also be solidified by heating, pressure molding or a binder, but it is desirable to solidify by mixing an inorganic fiber material into a dry silica core material and pressure molding. In order to prevent the density from becoming higher than necessary by not using a binder or heating, it has such heat insulation performance. Further, if the content of dry silica is 50%, it is solidified. Further, the average fiber diameter of the inorganic fiber material is preferably 10 μm or less, and if it is larger than 10 μm, the gap between the fibers becomes large, a vacuum heat insulating material excellent in initial performance cannot be obtained, and flexural elasticity is improved. It can have flexibility.

  Further, the content of inorganic fibers in the core material is preferably 0.5 to 40 wt%, and it is desirable to mold by pressing. If the amount is less than 0.5 wt%, solidification does not occur. If the amount is more than 40 wt%, the air gap distance increases and the pressure dependency is inferior.

Further, the density of the core material after the pressure molding is desirably 50 kg / m ³ or more and 400 kg / m ³ or less. Within this range, the void diameter between particles can be reduced, and a core material that retains the optimum void diameter from the viewpoint of initial performance and reliability can be obtained, providing excellent heat insulation performance and ensuring long-term reliability. This is because it can be done.

  Moreover, heat insulation performance improves further by mixing 1-30 wt% of carbon black with respect to the said dry-type silica. The use of a core material obtained by mixing such a dry silica with a powdered carbon material for a vacuum heat insulator greatly improves the heat insulation performance.

  For example, carbon black and titanium oxide are known to work as radiation inhibitors at high temperatures as powders added to silica to improve thermal insulation performance. It is done.

  Although this reason is not certain, it is considered that solid heat conduction is reduced by some action of silica powder and carbon black.

  Moreover, when dry silica, carbon black, and a fiber material are mixed, a molded article having high heat insulation performance can be formed.

  Further, after mixing the dry silica and the carbon material, the fiber material may be added and mixed, or the dry silica, the carbon material, and the fiber material may be mixed at the same time, but the former is preferable. This is because the dry silica and the carbon material are more easily dispersed uniformly in the former.

  As a method for mixing dry silica and powdered carbon, it is desirable to use a mixing container having a stirring blade, and further, the mixing container rotates itself, or the powder can be rotated and mixed by having a rotor at the bottom. desirable.

  This is because the secondary or tertiary aggregate of silica present in the raw material can be crushed by using a mixing vessel having stirring blades. As a result, since the silica and the powdery carbon material are uniformly dispersed, it is possible to suppress deterioration of the heat insulation performance due to a partial decrease in the degree of dispersion.

  Moreover, it is desirable that the volume change rate before and after the pressure reduction of the core material is within 50%. The volume change rate of the core material is, for example, that the core material volume reduced by compressing to the atmosphere by enclosing the core material in a bag having high gas barrier properties such as a laminated film bag and reducing the pressure to the core material volume before the pressure reduction It is the rate of change of the core material volume that is reduced. When the volume change rate is within 50%, even if the vacuum insulator is compressed by atmospheric compression by decompression, the volume change of the core material is small, so that deformation of the vacuum insulator can also be suppressed, and deformation and cracks can be suppressed. Reliability can be improved. In particular, if the material constituting the vacuum heat insulator is thin and weak in strength, the effect is high, and the vacuum heat insulator can be thinned, so that space can be saved.

  Further, the vacuum in the vacuum insulator may be welded by sealing the whole atmosphere or by welding and sealing while reducing the pressure from the opening of the vacuum insulator. Alternatively, a gas adsorbent may be installed inside the vacuum heat insulator, and the pressure may be reduced by the principle of a chemical vacuum pump.

  Moreover, it is possible to improve reliability by providing a gas adsorbent and a moisture adsorbent in addition to the adsorbent as a chemical vacuum pump inside the vacuum heat insulator.

  Further, the welding method is not limited, and any of vibration, laser, ultrasonic wave, high frequency, hot plate, non-contact hot plate, infrared ray, spin welder, hot air, adhesive, brazing and the like may be used.

  Moreover, in order to put a vacuum heat insulating body in the gasket in the door rack, since the gasket originally has a space, it may be inserted into the empty space.

  In the first embodiment, the door device 1 is a single-opening door device, but the same effect can be obtained even in a double-opening door device, a double-opening door device, or a drawer-type door device using a rail. Have.

  The door device 1 according to the present embodiment includes a door disposed at an opening inside the box of the heat insulation box, and a gasket 10 provided on the inner edge of the door and closely contacting the opening front edge of the heat insulation box when the door is closed. In the gasket 10, the core material 22 is covered with a gas barrier outer sheath material 21, and the outer sheath material 21 is depressurized, and the outer sheath materials 21 overlap each other at both ends in the longitudinal direction. A vacuum heat insulator 16 having no protruding fin portion is provided, and the heat insulation performance of the gasket 10 part is greatly improved by inserting the vacuum heat insulator 16 having a reduced pressure inside the gasket 10 part. Suppresses heat in and out of the body and improves the heat insulation or cold insulation performance of the heat insulation box.

  Moreover, when the vacuum heat insulating body 16 has a structure in which the jacket materials 21 are overlapped with each other in addition to both ends in the longitudinal direction and there is no fin portion protruding outward, when installing the gasket 10 inside, along the longitudinal direction. Installation is easy without the continuous fins being caught.

  Moreover, in order to make the vacuum heat insulating body 16 into a shape that can be installed in the gasket 10, the general gasket 10 has an elongated structure. For this reason, in the case of a vacuum heat insulator that has a fin portion that is continuous along the longitudinal direction, that is, in the case of a vacuum heat insulator welded along the longitudinal direction, the seal length becomes longer with respect to the heat insulator area. Since the amount is increased and the performance degradation is accelerated, the vacuum heat insulating body 16 is superior in reliability in that there are no fin portions that are overlapped with each other other than the longitudinal end portions and protrude outward.

(Embodiment 2)
FIG. 3 shows a cross-sectional view of the main part of the door device according to Embodiment 2 of the present invention. Components having the same names and functions as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In FIG. 3, a vacuum insulator gasket 28 made of extrusion is attached to the sash 4. Further, a magnet band 29 is attached to the inside of the vacuum heat insulating gasket 28, and the magnet band 29 forms an airtight structure together with the refrigerator main body by adsorbing to the inward flange portion 18 when the door device 1 is closed. To do. Thereby, leakage of cold air from the refrigerator can be prevented, and the amount of heat absorption can be reduced and condensation on the vacuum heat insulating gasket 28 can be prevented.

  The material configuration, manufacturing method, and the like of the vacuum insulator gasket 28 are the same as those in the first embodiment.

  The magnet band 29 may be encapsulated together when the core material 22 is encapsulated in the jacket material 21. In the second embodiment, the magnet band 29 is sealed inside the vacuum heat insulating gasket 28, but may be outside the vacuum heat insulating gasket 28.

  Also, magnetic means are used to bring the vacuum insulator gasket 28 and the flange portion 18 into close contact with each other. However, physical means such as adsorption, pinching, and pushing, mechanical means including an anchor or hook portion, adhesive seals, and the like. Alternatively, chemical means using an adhesive or the like may be used.

  In addition, the vacuum insulator gasket 28 and the sash 4 are connected by physical means such as magnetic force, adsorption, pinching, and pushing, mechanical means including an anchor or hook portion, chemical means using an adhesive seal, an adhesive, or the like. May be used.

  In the second embodiment, the door device 1 uses a single-open door device, but the same effect can be obtained even if it is a double-fold door device, a double-open door device, or a drawer-type door device using a rail. Have.

  The door device 1 according to the present embodiment includes a door disposed at an opening inside the box of the heat insulation box, a gasket that is provided on the inner edge of the door and closes to the front edge of the opening of the heat insulation box when the door is closed. And the gasket covers the core material 22 with the gas barrier outer material 21 and decompresses the inner surface of the outer material 21. It is composed of a vacuum heat insulating gasket 28 having no part, and by making the gasket itself a vacuum heat insulating gasket 28 whose pressure is reduced, the heat insulation of the gasket part can be remarkably improved, and the inside of the heat insulating box Prevents heat from entering and exiting inside and outside, improving the heat insulation or cold insulation performance of the heat insulation box.

  Moreover, in order to make a vacuum heat insulating body into the shape of a gasket, if it is a general gasket, it will become an elongate structure. For this reason, in the case of a vacuum heat insulator that has a fin portion that is continuous along the longitudinal direction, that is, in the case of a vacuum heat insulator welded along the longitudinal direction, the seal length becomes longer with respect to the heat insulator area. Since the amount is increased and the performance degradation is accelerated, the vacuum heat insulating body in which the jacket materials are overlapped with each other at both ends in the longitudinal direction and there is no fin portion protruding outward is more reliable.

  Further, the door portion is one of the most easily spotted parts when opening and closing the door device 1, and if there is a fin portion that continues along the longitudinal direction, the appearance is inferior. If the structure is such that there is no fin portion that the outer cover materials 21 overlap each other and protrude outwards other than the both ends in the longitudinal direction of the vacuum heat insulating gasket 28, a clean appearance is obtained.

  The door device according to the present invention is superior in heat insulation performance between the inside of the cabinet and the outside air than conventional products, and can prevent heat from entering from the gasket part in particular, and as a result, the heat absorption amount of the heat insulation box is reduced. In addition, condensation on the gasket portion can be prevented. Therefore, it can be efficiently used for heating and cooling equipment such as refrigerators and refrigerators, and can be used for any equipment that can contribute to energy savings and doors of any insulated box such as physical objects that you want to protect from heat and cold. Applicable to usage.

Sectional drawing of the principal part of the door apparatus in Embodiment 1 of this invention Sectional drawing of the vacuum heat insulating material used for the door apparatus of the embodiment Sectional drawing of the principal part of the door apparatus in Embodiment 2 of this invention External perspective view of a refrigerator using a conventional door device Sectional view of the main part of a conventional door device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Door apparatus 10 Gasket 16 Vacuum heat insulating material 21 Cover material 22 Core material 23 Gas adsorption material 28 Vacuum heat insulating material gasket

Claims (10)

  A door disposed at the opening in the chamber of the heat insulation box, and a gasket that is provided on the inner edge of the door and is in close contact with the front edge of the opening of the heat insulation box when the door is closed. The outer cover material is covered with a gas barrier covering material and the inside of the outer cover material is depressurized. Feature door device.   A door disposed in the opening of the inside of the heat insulating box, and a gasket that is provided on the inner edge of the door and is in close contact with the front edge of the opening of the heat insulating box when the door is closed. Covering with a gas barrier covering material, the inside of the covering material is depressurized, and the covering material is overlapped with each other except for both ends in the longitudinal direction, and is composed of a heat insulator that has no fin portion protruding outward. Feature door device.   The door device according to claim 2, wherein an elastic material is bonded to both sides or one side of the gasket.   The door device according to any one of claims 1 to 3, wherein the covering material is made of a multilayer resin material formed by extrusion molding.   The jacket material is ethylene-vinyl alcohol copolymer, polyacrylonitrile, polyamide 6, polyamide 11, polyamide 12, polybutylene terephthalate, polyethylene terephthalate, polybutylene naphthalate, polyethylene naphthalate, polyvinylidene fluoride, polyvinylidene chloride, The material is at least one selected from the group consisting of ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene, polyphenylene sulfide, polyether ether ketone, polyimide, polyether imide, and polyphenylene oxide. The door apparatus as described in any one of Claims 1-4. 6. The coating material according to claim 1, wherein at least one of the covering materials is formed of a metal, SiO ₂ , Al ₂ O ₃ , and diamond-like carbon. The door device described in 1.   The core material is dry silica having an average primary particle diameter of 100 nm or less, an inorganic fiber material having an average fiber diameter of 10 μm or less, and the content of the inorganic fiber material in the core material is 0.5 to 40 wt%. The door device according to any one of claims 1 to 6, wherein the door device is formed by mixing and pressurizing as described above.   The door device according to claim 7, wherein 1 to 30 wt% of carbon black is mixed in the core material.   The door device according to any one of claims 1 to 8, wherein a gas adsorbent is contained in the heat insulator.   A refrigerator using the door device according to any one of claims 1 to 9.

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