JP2007015696A - Vacuum heat insulating container, and heat-accumulation type heater for automobile to which vacuum heat insulating container is applied - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum heat-insulating container having enhanced heat insulating performance. <P>SOLUTION: A mixed powder which is obtained by mixing two or more kinds of powders with each other to have a bulk density of 0.040-0.065 g/cm<SP>3</SP>is filled between an inside container 2 and an outside container 3 and between the inner wall and the outer wall of an opening part 6 to form a heat insulating material. Thereby, the heat insulation performance can be enhanced by reducing the void size between particles during the pressure reduction, and reducing the effect of its gas heat conductivity. Further, a projecting-shaped opening part 6 is formed of a material having the heat conductivity lower than that of a material of a container part, and the heat insulating material 7 is provided between the inner wall and the outer wall of the opening part 6, and the pressure is reduced therein. Thereby, the heat insulation performance can be enhanced by considerably reducing the heat leak caused by direct heat conduction from the inner container wall to the outer container wall. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat storage type warming apparatus in which a vacuum heat insulating container and a vacuum heat insulating container are applied as a reservoir tank for heat insulation of cooling water.

  Some heat insulating containers have a structure in which a vacuum heat insulating space is provided between an inner container and an outer container, such as a so-called thermos. In this type of vacuum heat insulating container, the degree of vacuum in the heat insulating space greatly affects the heat insulating performance. In addition, the vacuum heat insulating container having the vacuum heat insulating space as described above is limited in shape from the viewpoint of strength, and a simple shape such as a cylindrical shape is common.

In addition, in order to ensure heat insulation performance at a low degree of vacuum, the heat insulating space is filled with a heat insulating material such as fine-grained silica, and in order to increase the mechanical strength of the container, a support is provided between the inner container and the outer container. There has also been proposed a vacuum insulation container provided with (see Patent Document 1).
JP 2001-128860 A

However, in the above conventional configuration, the heat insulating material between the inner container and the outer container is made of one kind of finely divided silica having a bulk density of about 0.1 g / cm ^3. The heat insulation performance is likely to decrease with increasing temperature. In addition, direct heat conduction from the inner container wall to the outer container wall tends to occur, heat leaks increase, and it is difficult to maintain the heat retaining performance of the medium in the container.

  An object of this invention is to provide the vacuum heat insulation container which improved the heat retention performance in view of the said conventional subject.

In order to achieve the above object, the vacuum heat insulating container of the present invention has a bulk density of 0.040 to 0.00 by mixing two or more kinds of powders between the inner container and the outer container and between the inner wall and the outer wall of the opening. This is characterized in that the mixed powder of 065 g / cm ³ is filled and decompressed.

  Thereby, the void diameter between particles can be reduced, and the influence of gas thermal conductivity can be reduced.

  Further, the vacuum heat insulating container of the present invention is provided with a convex opening made of a material having a lower thermal conductivity than the material of the container part, and a pressure is reduced by providing a heat insulating material between the inner wall and the outer wall of the opening part. It is characterized by.

  Thereby, heat leak due to direct heat conduction from the inner container wall to the outer container wall can be drastically reduced.

  The vacuum heat insulation container of the present invention can minimize a decrease in heat insulation performance due to air intrusion into the decompression space and a decrease in heat insulation performance due to an increase in gas thermal conductivity when the temperature rises.

  Moreover, the vacuum heat insulation container of this invention can suppress significantly the fall of the heat insulation performance by the heat leak from an inner container wall to an outer container wall, and can improve heat retention performance.

The invention of the vacuum heat insulating container according to claim 1 is an inner container whose inside is kept in a warm room, an outer container provided so as to surround the outer side at a predetermined distance from the inner container, and the inner container. And a vacuum heat insulating space formed between the outer container and the outer space, and two or more kinds of powders are mixed in the heat insulating space to obtain a bulk density of 0.040 to 0.065 g / cm ^3. Since it is filled with powder, the void diameter between particles is reduced, and the influence of gas thermal conductivity is reduced, so the heat insulation performance is reduced due to air penetration and the increase in gas thermal conductivity during temperature rise. Can be minimized.

  According to a second aspect of the present invention, the vacuum heat insulating container according to the first aspect is provided with a convex opening, and the space between the inner wall and the outer wall of the opening is filled with a heat insulating material and decompressed. Therefore, direct heat conduction from the inner container wall to the outer container wall can be reduced, and the heat insulation performance of the vacuum heat insulating container can be improved.

Invention of the vacuum heat insulation container of Claim 3 WHEREIN: The invention of Claim 1 or 2 WHEREIN: As for the heat insulating material of an opening part, the bulk density of Claim 1 is 0.040-0.065 g / cm < ³ >. In the case of the invention according to claim 2, the heat insulation performance of the vacuum heat insulating container can be reduced because the heat passage in the left-right direction of the opening can be reduced as compared with the case of the invention according to claim 2. Can be further improved.

  The invention of the vacuum heat insulation container according to claim 4 is the invention according to any one of claims 1 to 3, wherein a material having a lower thermal conductivity than the material of the container is applied to the material of the opening. Therefore, heat conduction from the inner container wall to the outer container wall can be reduced, heat leak can be significantly reduced, and the heat insulation performance of the vacuum heat insulating container can be improved.

  The invention of the vacuum heat insulating container according to claim 5 is the invention according to any one of claims 1 to 4, wherein stainless steel is applied to the material of the opening, and aluminum is applied to the material of the container, By applying a material with less gas penetration and moisture penetration, gas penetration and moisture penetration into the heat insulation space can be minimized and the heat insulation performance of the vacuum insulation container over time can be improved. In addition, low-cost and strong aluminum is used for the container part, and the heat conductivity is lower than that of aluminum, and a slightly expensive and sturdy stainless steel is used for the opening part to provide a vacuum insulated container with strong housing strength at low cost. At the same time, since the thermal conductivity of stainless steel is about 0.07 times that of aluminum, heat leakage from the inner container to the outer container through the opening is remarkably suppressed, and the heat insulation of the vacuum insulation container is maintained. The performance can be significantly improved.

  The invention of the vacuum heat insulation container according to claim 6 is the invention according to any one of claims 1 to 4, wherein plastic is used for the material of the opening and metal is used for the material of the container. The thermal conductivity of the part material becomes significantly smaller than the thermal conductivity of the container part material, and heat leak from the inner container to the outer container is further suppressed than in the case of the invention according to claim 5, The heat insulation performance of the vacuum heat insulating container can be further improved as compared with the case of the present invention.

  The invention of the vacuum heat insulating container according to claim 7 is the invention according to claim 6, wherein at least one layer of the plastic of the opening is covered with a laminate film made of a metal film, and the opening is insulated. Since the gas intrusion into the space can be remarkably reduced, the heat retention performance of the vacuum heat insulating container over time can be improved.

  The invention of the vacuum heat insulation container according to claim 8 is the invention according to claim 6, wherein at least one layer of the plastic of the opening is covered with a laminate film made of a film on which metal or metal oxide is deposited. Thus, heat leakage from the inner container to the outer container through the laminate film covering the opening can be reduced, and the heat retaining performance can be further improved than in the case of claim 7.

  The invention of the heat storage type warming device for an automobile according to claim 9 uses the vacuum heat insulating container according to any one of claims 1 to 8 as a reservoir tank for keeping the cooling water of the automobile engine part. Since it is possible to easily warm the cooling water to a predetermined temperature at the time of starting, the fuel efficiency of the automobile can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same reference numerals are given to the same configurations as those of the conventional examples or the embodiments described above, and detailed description thereof will be omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a cross-sectional view of a vacuum heat insulating container according to Embodiment 1 of the present invention.

  The vacuum heat insulating container 1 according to the present embodiment is composed of an inner container 2 and an outer container 3, and a space between them is filled with powder 4 and the inside is sealed under reduced pressure. The inner container 2 and the outer container 3 are made of plastic or metal, and the materials of the inner container and the outer container may not be equivalent.

  Examples of plastics include, for example, polyethylene, polypropylene, polystyrene, acrylonitrile styrene resin, acrylonitrile butadiene styrene resin, methacrylic resin, vinyl chloride, polyamide, polyacetal, polyethylene terephthalate, polybutylene terephthalate, polymethylpentene, polycarbonate, polyphenylene ether, polyphenylene sulfide. , Polyetheretherketone, polytetrafluoroethylene, polyetherimide, polyarylate, polysulfone, polyethersulfone, polyamideimide, phenol resin, urea resin, melamine resin, unsaturated polyester resin, alkyd resin, epoxy resin, Diallyl phthalate resin and the like. Examples of the metal include aluminum, stainless steel, copper, nickel, and cobalt.

The powder 4 is made of a mixed powder in which two or more kinds of powders are mixed to have a bulk density of 0.040 to 0.065 g / cm ³ . By mixing two or more kinds of powders, a synergistic effect of further reducing the gap diameter between grains is provided. At this time, the packing density between the inner container and the outer container is more preferably 0.02 to 0.5 g / cm ³ .

  The opening 5 is made of plastic or rubber.

Since the vacuum heat insulating container 1 configured in this way is composed of a mixed powder in which the filled powder 4 is a mixture of two or more kinds of powders and the bulk density is 0.040 to 0.065 g / cm ³ , Since the void diameter between particles is reduced and the influence of gas thermal conductivity is reduced, it is possible to minimize the deterioration of thermal insulation performance due to air intrusion and the deterioration of thermal insulation performance due to increase of gas thermal conductivity during temperature rise. . Therefore, the heat retention performance can be improved.

(Embodiment 2)
FIG. 2 is a cross-sectional view of a vacuum heat insulating container according to Embodiment 2 of the present invention.

The vacuum heat insulating container 1 of the present embodiment is provided with a convex opening 6, a heat insulating material 7 is provided between the inner wall and the outer wall of the opening 6, and the space between the inner wall and the outer wall of the opening 6 is also a container part. It is a vacuum heat insulation container which decompressed and sealed like the space between the inner container 2 and the outer container 3. As in the first embodiment, the heat insulating material 7 is a mixed powder in which two or more kinds of powders are mixed to have a bulk density of 0.040 to 0.065 g / cm ^{3 in the same} manner as the powder filled in the container portion. Yes. At this time, the packing density between the inner wall and the outer wall is more preferably 0.02 to 0.5 g / cm ³ .

  In addition, a stopper 8 is provided in the opening to prevent leakage when liquid enters the container.

  As the material of the plug portion 8, plastic or rubber is used.

The vacuum heat insulating container 1 thus configured has a convex opening, reduces direct heat conduction from the inner container wall to the outer container wall, and further has a bulk density of 0 in the space between the inner wall and the outer wall of the opening. By filling with 0.040 to 0.065 g / cm ³ of powder and reducing the pressure, heat passing in the left-right direction of the opening can also be reduced, reducing heat leak from the inner container wall to the outer container wall, The heat retention performance of the vacuum heat insulating container can be improved.

(Embodiment 3)
FIG. 3 is a cross-sectional view of the vacuum heat insulating container according to Embodiment 3 of the present invention.

  In the vacuum heat insulating container 1 of the present embodiment, the container part of the inner container 2 and the outer container 3 is made of aluminum having a thermal conductivity of 240 W / mK, and the opening 6 is made of stainless steel having a thermal conductivity of 16 W / mK.

  The vacuum heat insulating container 1 configured in this way is made from the inner container wall through the opening 6 to the outer container wall by making the opening 6 material a material whose thermal conductivity is 1/15 times lower than that of the container material. It is possible to remarkably reduce heat conduction to the substrate, suppress heat leak, and improve the heat insulation performance of the vacuum heat insulating container.

  In this case, when a 2.5 L cubic container was used and 90 ° C. hot water was kept warm, the temperature of the hot water after 24 hours was around 70 ° C., which was remarkably high. On the other hand, when the lid was also made of aluminum, the temperature of hot water after 24 hours was around 25 ° C.

  In addition, because the material of the container part is aluminum and the material of the opening 6 is stainless steel, and the material with little gas intrusion and moisture intrusion is applied, the gas intrusion and moisture intrusion into the heat insulation space are minimized, and the heat insulation over time It is possible to suppress a decrease in performance, and at the same time, since aluminum and stainless steel are inexpensive and sturdy, low-cost vacuum insulation containers with strong housing strength can be provided.

(Embodiment 4)
FIG. 4 is a cross-sectional view of a vacuum heat insulating container according to Embodiment 4 of the present invention.

  In the vacuum heat insulating container 1 of the present embodiment, aluminum having a thermal conductivity of 240 W / mK is used as the material for the container, and polyethylene having a thermal conductivity of 0.34 W / mK is used as the material for the opening 6. In this case, heat leak from the inner container to the outer container can be further suppressed than in the third embodiment, and the heat retaining performance of the vacuum heat insulating container can be further improved.

  In this case, when a 2.5 L cubic container was used and hot water of 90 ° C. was kept warm, the temperature of hot water after 24 hours was about 75 ° C., which was much higher.

(Embodiment 5)
FIG. 5 is a cross-sectional view of a vacuum heat insulating container according to Embodiment 5 of the present invention.

  In the vacuum heat insulating container 1 of the present embodiment, the surface of the opening 6 made of plastic is covered with a laminate film 12 having gas barrier properties. In this case, gas intrusion into the decompression space from the opening 6 plastic part can be reduced, and the heat insulation performance over time of the container itself can be improved.

  The laminate film 12 has a laminated structure of a polymer compound such as polypropylene, polyethylene, polyethylene terephthalate, and nylon and a metal foil. At the time of welding, the laminate film 12 is heated to a temperature equal to or lower than the melting point of the metal foil and welded to the plastic in the opening. At this time, since the metal foil is welded below the melting point of the metal foil, the metal foil is maintained without melting, and the gas barrier property of the metal foil is good, so that the influence of gas intrusion from the opening can be suppressed.

  In addition, when a film obtained by vapor-depositing a metal or metal oxide on an ethylene vinyl alcohol copolymer film is used instead of the metal foil of the laminate film 12, the gas barrier property is maintained and the metal foil is further used. In addition, heat leaks transmitted through the film can be reduced, and the heat retention performance can be further improved. At this time, the laminate film is attached to the plastic in the opening with an adhesive.

(Embodiment 6)
FIG. 6 shows a heat storage warm-up device for an automobile in Embodiment 6 of the present invention.

  The regenerative warming device 13 of the present embodiment is a circulation path in which the cooling water heated by the engine 15 is cooled by the radiator 16 through the cooling water circuit 14 and returned to the engine 15 again. Further, when the cooling water at the time of starting the engine is not warmed, the thermostat 17 is fully closed, and the cooling water circulates through the bypass flow path 18 without passing through the radiator 16 having a heat radiation action, and the temperature of the cooling water is increased. Speed up. Further, during continuous running of the automobile, the cooling water warmed in the cooling water circuit 14 flows through the flow rate control valve 21 from the switching inlet pipe 19 into the vacuum heat insulating container 1 called a reservoir tank, and is kept warm. Thereafter, when the engine is started, the flow control valve 21 is caused to flow from the switching outlet pipe 20 to the cooling water circuit and mixed with the cooling water to accelerate the temperature rise of the cooling water. Therefore, it is possible to improve the fuel efficiency of the vehicle when starting the engine.

  As described above, the vacuum heat insulating container according to the present invention can minimize a decrease in heat insulating performance due to air intrusion and a decrease in heat insulating performance due to a temperature rise, and further from the inner container wall to the outer container wall. Since the deterioration of the heat insulation performance due to heat leak can be suppressed, it can be efficiently used for various applications requiring cold insulation and heat insulation.

Sectional drawing of the vacuum heat insulation container in Embodiment 1 of this invention Sectional drawing of the vacuum heat insulation container in Embodiment 2 of this invention Sectional drawing of the vacuum heat insulation container in Embodiment 3 of this invention Sectional drawing of the vacuum heat insulation container in Embodiment 4 of this invention Sectional drawing of the vacuum heat insulation container in Embodiment 5 of this invention Schematic of the regenerative warming device in Embodiment 6 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum heat insulation container 2 Inner container 3 Outer container 4 Powder 6 Opening part 7 Heat insulating material 9 Aluminum 10 Stainless steel 12 Laminate film 13 Thermal storage type warming device 15 Engine

Claims (9)

An inner container whose inside is a warm room, an outer container provided to surround the outer container at a predetermined distance from the inner container, and a vacuum formed between the inner container and the outer container. A heat insulating space, and two or more kinds of powders are mixed in the heat insulating space and filled with a mixed powder having a bulk density of 0.040 to 0.065 g / cm ^3. container.   The vacuum heat insulating container according to claim 1, wherein a convex opening is provided, and a space between an inner wall and an outer wall of the opening is filled with a heat insulating material and depressurized. The vacuum heat insulating container according to claim 1 or 2, wherein the heat insulating material of the opening is a powder having a bulk density of 0.040 to 0.065 g / cm ^{3 according} to claim 1.   The vacuum heat insulating container according to any one of claims 1 to 3, wherein a material having a lower thermal conductivity than the material of the container is applied to the material of the opening.   The vacuum heat insulating container according to any one of claims 1 to 4, wherein stainless steel is applied as a material of the opening and aluminum is applied as a material of the container.   The vacuum heat insulating container according to any one of claims 1 to 4, wherein plastic is used as a material of the opening and metal is used as a material of the container.   The vacuum heat insulating container according to claim 6, wherein at least one layer of the plastic in the opening is covered with a laminate film made of a metal film.   The vacuum insulating container according to claim 6, wherein at least one layer of the plastic in the opening is covered with a laminate film made of a film on which metal or metal oxide is deposited.   A heat storage type warming device for an automobile, wherein the vacuum heat insulating container according to any one of claims 1 to 8 is used as a reservoir tank for keeping the cooling water of an automobile engine part.

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