JP2008105748A - Insulated container and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating container capable of reducing a manufacturing cost and obtaining a sufficient heat insulating effect, and capable of dealing with an installation space having a different shape, and a method for manufacturing the same.
SOLUTION: An insulating container that retains and retains a liquid, and includes an inner container 1 that stores the liquid and includes a liquid inlet and outlet 5 and a sheet-like exterior material 3 that accommodates the inner container 1. And a heat insulating space in which a heat insulating material 2 and a gas adsorbing material 4 are enclosed between the outer packaging material 3 and the inner container 1 to form a decompression space. A heat insulating container provided with a filler 6 was obtained.
[Selection] Figure 1

Description

  The present invention relates to a heat insulating container for storing and storing a liquid, and particularly to a heat insulating container for storing and storing LLC of a vehicle engine.

Currently, improvement of fuel efficiency is sought as a global energy saving and environmental measure, and the cold start pattern at the time of engine start (fuel consumption at start-up) is one of the indicators of the fuel efficiency mode.
Conventionally, it is known that the warm-up operation of the engine is promoted by storing the LLC of the vehicle engine in a heat insulating container and circulating the LLC, which is kept warm when the engine is started (Patent Document 1). .
Similarly, as a method for keeping the container warm, a bag is formed with a laminate film having a metal foil or a metal vapor deposition part, and a vacuum heat insulating material that is sealed under reduced pressure by inserting a heat insulating material having a void inside is formed around the container. One is known (Patent Document 2).

JP 2006-104974 A JP 2002-0586604 A

  In order to improve fuel efficiency at start-up, the vehicle engine insulation container has high-performance heat retention performance that keeps the LLC warmed by preheating the engine until the next engine start, and also reduces manufacturing costs. It has been demanded. Moreover, since it is installed in the engine room, space saving and compatibility with different shapes are strongly demanded.

In the heat insulation container shown in Patent Document 1, a heat insulation space in a vacuum state is formed between a metal inner container and a metal outer container, and the inner container and the outer container are integrally formed by welding or spinning. ing.
However, when the inner container and the outer container are made of a metal such as stainless steel, the manufacturing cost is high, and heat is easily transmitted from the metal joint between the inner container and the outer container by a thermal bridge (heat bridge effect), A sufficient heat insulating effect was not obtained. In addition, thin stainless steel of 1 mm or less is used to control the thermal bridge, and the shape is limited to a cylindrical shape to prevent deformation due to a pressure difference from the atmosphere, and there is a limit to designing a shape suitable for the installation space. There was a limited number of models.

  On the other hand, since the heat insulating structure shown in Patent Document 2 is wound around the side of the container after the plate-shaped vacuum heat insulating material is formed, a gap (air layer) is easily formed between the container and the heat insulating structure is housed inside. In the case of a cylindrical container, the heat insulation of the vehicle engine is caused by heat loss from the gap between the joint surface at the end of the vacuum heat insulating material wound around the side surface of the container and the joint between the lid portion and the bottom portion and the side portion. It has been difficult to apply to a high-performance heat insulating container as required for the container.

  In view of the above problems, the present invention aims to provide a heat insulating container capable of reducing the manufacturing cost and obtaining a sufficient heat insulating effect, and capable of accommodating a different installation space, and a method for manufacturing the same. .

In order to achieve the above object, according to the first aspect of the present invention, there is provided a heat insulating container that retains and retains a liquid, and includes an inner container that has a liquid inlet and outlet and stores the liquid, and an inner container. There is provided a heat insulating container comprising a sheet-shaped outer material and a heat insulating space in which a heat insulating material and a gas adsorbing material are enclosed between the inner container and the outer material to form a decompression space.
According to a second aspect of the present invention, there is provided a heat insulating container, wherein the inner container is made of stainless steel or resin, and the exterior material is a laminate film provided with an adhesive layer.
According to a third aspect of the present invention, there is provided a heat insulating container characterized in that a filler is provided at a joint portion between the inner container and the exterior material.
In the invention described in claim 4, the heat insulating material is an inorganic fiber of glass wool, rock wool, or ceramic fiber, and the adsorbent is made of calcium oxide, barium / lithium alloy, and cobalt oxide. Provide an insulated container.
The invention described in claim 5 is a method for manufacturing a heat insulating container for storing and storing a liquid, wherein the liquid is stored therein, the liquid container is provided with an inlet and an outlet, and the inner container is accommodated. A sheet-like exterior material that forms a heat-insulating space between the inner container and the heat-insulating material and a gas adsorbing material enclosed in the heat-insulating space to form a decompressed space, and a joint between the outer material and the inner container A method for manufacturing a heat-insulating container is provided.
The invention described in claim 6 is a method for manufacturing a heat insulating container for storing and storing a liquid, wherein the liquid is stored therein and includes an inlet and an outlet for the liquid, and the inner container is accommodated. And a sheet-like exterior material that forms a heat insulation space between the interior container and the interior of the heat insulation space enclosed with the heat insulation material and the gas adsorbent to form a decompression space and joined to the exterior material Provided is a method for manufacturing a heat-insulating container, characterized in that the inside of the joint portion of the container is preheated to thermally weld the joint portion. Here, for the preheating, a heating method using an auxiliary heater, a heating method using hot air, or the like can be used.

The present invention has the following effects.
(1) Since the inner container and the vacuum heat insulating layer are integrated by the sheet-shaped exterior material, a high performance vacuum heat insulating layer can be formed. As a result, for example, heat leakage from the inside of the container of the LLC liquid disposed in the engine room for the vehicle is reduced, and an effect is obtained in improving the fuel consumption of the automobile, particularly in starting the engine.
(2) In addition, the inner container and the vacuum heat insulating layer are integrated by a sheet-like exterior material, so it can be used for various shapes of internal containers, and the inner container can be designed according to the installation space and its heat insulating layer can be formed. It becomes. For example, even in a vehicular engine room where space is limited, it is possible to design a heat insulating container that retains and retains the LLC liquid.
(3) Furthermore, the manufacturing cost can be significantly reduced by using a stainless steel container as the inner container and using an inexpensive laminate film as the exterior material.
(4) By providing a filler at the joint between the inner container and the exterior material, the heat insulation space can be easily and reliably formed.
(5) By preheating the inside of the joint portion of the inner container, heat fusion between the inner container and the exterior material is ensured.

An example of a heat insulating container of the present invention is shown in FIGS. In the present invention, since the inner container 1 and the vacuum heat insulating layer are integrated using the sheet-like laminate film 3 as an exterior material, it is possible to form a high-performance vacuum heat insulating layer corresponding to various shapes of the inner container 1. Is possible. FIG. 3 shows a cross-sectional view in which a filler 6 is provided at a joint portion 7 between the inner container 1 and the exterior material 3.
In order to realize this structure, in the present invention, the sheet-like laminate film 3 is directly heat-welded to the liquid outlet / inlet 5 of the inner container 1 to maintain the vacuum state of the heat insulating layer. However, a gap is likely to occur at the three points where the two laminate films 3 and the inner container 1 are in contact, and it is difficult to maintain a vacuum state. Therefore, in the present invention, the use of the filler 6 enables thermal welding without gaps. The filler 6 is made of a thermoplastic resin made of the same or different material as the adhesive layer 11 of the laminate film 3 and melts at the time of thermal welding to fill the gap. The filler 6 is made by processing the joint 7 of the inner container 1. A structure that can control the generation of a gap with protrusions or different materials is bonded to the joint 7. Examples of the shape of the filler 6 are shown in FIGS.

  Next, the inner container material 1 is made of metal or resin. From the viewpoint of heat insulation performance, a metal having a large heat capacity is preferable, and stainless steel having a low thermal conductivity is particularly desirable. However, in the case of a container shape that is difficult to cope with by further cost reduction or metal, it can be formed of resin. Resin is acrylonitrile butadiene styrene copolymer (ABS), acrylonitrile styrene copolymer (AS), EEA resin (EEA), epoxy resin (EP), ethylene vinyl acetate polymer (EVA), ethylene vinyl alcohol copolymer (EVOH) ), Liquid crystal polymer (LCP), MBS resin (MBS), melamine formaldehyde (MMF), polyamide (PA), polybutylene terephthalate (PBT), polycarbonate resin (PC), polyethylene (PE), polyethylene terephthalate (PET) , Tetrafluoroethylene perfluoroalkyl vinyl ether polymer (PFA), polyimide (PI), polymethyl methacrylate (PMMA), polyacetal resin (POM), polypropylene (PP), polyphthalamide (PPA), polyphenylene sulfide resin (PPS) , Polystyrene (PS), polytetrafluoroethylene polytetrafluoroethylene (PTFE), Polyurethane (PU), polyvinyl alcohol (PVA), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), is selected and used from such. However, since the gas permeation amount of the resin is larger than that of the metal, when the resin is selected as the material of the inner container, it is desirable to form a gas parlia layer in order to control the gas permeation, and the metal layer is preferably formed by plating. is there. Thereby, the vacuum degree of a vacuum heat insulation layer will be maintained for a long period of time.

  A schematic diagram of the laminate film 3 which is an exterior material is shown in FIG. The protective layer 8 / protective layer (base material layer) 9 / gas barrier layer 10 / adhesive layer 11 has a multilayer structure. In particular, the adhesive layer 11 can be bonded to each other and bonded to the metal surface. Is preferably an ethylene-vinyl alcohol copolymer, nylon, polyvinyl alcohol, polyvinylidene chloride or polyester having a low gas permeability, and an ethylene-vinyl alcohol copolymer is particularly preferred. Further, in order to prevent gas leakage from the interface between the adhesive layer 11 and the gas barrier layer 10 to the heat insulating layer, it is effective in maintaining the degree of vacuum if the metal-deposited metal layer is previously provided on one side of the ethylene-vinyl alcohol copolymer film. There is.

The heat insulating material 2 to be encapsulated is preferably made of glass wool, rock wool, or ceramic fiber, particularly glass wool having an average fiber diameter of 5 μm or less and dried adsorbed moisture in a high temperature atmosphere.
In addition, if the heat insulating layer is used for a long time, there is a risk that the degree of vacuum may decrease due to the gas generated from the heat insulating material 2 or the gas that permeates the joint resin. Agent 4 is essential. The adsorbent 4 is preferably calcium oxide that mainly adsorbs moisture, barium / lithium alloys that mainly adsorb oxygen and nitrogen, and cobalt oxide that mainly adsorbs hydrogen. However, when each adsorbent is encapsulated alone, the barium / lithium alloy adsorbs moisture generated from the heat insulating material, and there is a problem that the target oxygen and nitrogen adsorption capacity decreases, so the barium / lithium alloy layer Is a three-layer structure including a calcium oxide layer and a cobalt oxide layer (not shown).

In order to thermally weld the laminate film 3 to the inner container 1, a sealer that matches the shape of the liquid inlet / outlet 5 that is the joint 7 of the inner container 1 is used. When using the metal inner container 1, it is easy to heat-bond the adhesive layer 11 to the inner container joint 7, and the distance between the inner container 1 and the aluminum foil as the gas barrier layer 10 is increased. For the purpose of increasing the thermal resistance of 7, it is desirable to wind a sheet of the same material as the adhesive layer 11 around the inner container joint 7 in advance. At this time, the greater the amount of winding, the greater the thermal resistance, but the amount of gas passing through the adhesive layer 11 resin increases, so the amount of winding is preferably 50 μm or less.
In addition, since a gap is likely to occur at the three points where the two laminate films 3 and 3 and the inner container 1 are in contact with each other, it is desirable to install the filler 6 in advance. As described above, the filler 6 is made by joining the rod made of the same material as the adhesive layer 11 of the laminate film 3 to the joint 7 and joining the rod made of the same material as the inner container 1 to the joint 7. A protrusion produced by processing one joining portion 7 or a rod made of a different material is joined to the joining portion 7 (FIG. 3). Specifically, the cross-sectional circle of FIG. 4, the cross-sectional triangle of FIG. 5, the one formed on the entire circumference of the joint portion of FIG. 6, and the like can be considered, but the present invention is not limited to this.

The glass wool 2 is wound around the inner container in which the filler 6 is formed. The winding amount of the glass wool 2 at this time is determined from the heat insulating performance required for the heat insulating container (details will be described in Example 2).
As shown in FIG. 8, the inner container 1 is placed between the two laminate films 3 and 3 facing the adhesive layer 11 with respect to the liquid outlet / inlet 5 of the inner container 1 around which the glass wool 2 is wound. Install 6 so that it is at the triple point and heat weld with a sealer.
The above-described sealer has a structure in which a high heat-resistant rubber 12 made of fluorine is formed into a joint shape, and a ribbon-shaped metal heater 13 and a glass cloth 14 are disposed thereon. Moreover, the fusion | melting conditions by a sealer hold | maintain for 6 second or more at the temperature 20 degreeC higher than melting | fusing point of the contact bonding layer 11 in the state which pressed the laminate film 3 to the inner container 1. FIG. However, when the metal inner container 1 is used, the temperature of the inner container joint 7 of the laminate film 3 is equal to the welding temperature of the adhesive layer because the heat conductivity and heat capacity of the inner container 1 are large only with the sealer heater. Therefore, it is necessary to preheat the inner container joint 7 with an auxiliary heater (FIG. 9). In the preheating shown in FIG. 9, the hot air nozzle 15 is inserted inside the inner container joint 7 and the hot air 16 is sent to heat the inner container joint 7. However, a heating method such as an electric heater is used. It is also possible to use it, but it is not limited to this.

After the inner container 1 and the laminate film 3 are heat-sealed, both side surfaces of the laminate film 3 are heat-welded. At this time as well, as described above, the laminate films 3 are pressed and held at a temperature 20 ° C. higher than the melting point of the adhesive layer 11 for 6 seconds or more. After both sides of the laminate film 3 are heat-sealed to form the laminate film 3 in a bag shape, a getter material 4 serving as a gas adsorbent is loaded.
In this state, the chamber is put into a vacuum chamber, the inside of the chamber is evacuated to an internal pressure of 10 Pa or less, and the bottom of the container which is the other side is thermally welded under the same conditions as described above to form a vacuum heat insulating layer.
The purpose of evacuating the interior is to reduce the heat conductivity of the heat insulating material and to reduce the amount of heat dissipated from the inside of the heat insulating container. The heat propagating through the inside of the above-described fibrous heat insulating material is the sum of heat transmitted through gas, heat transmitted through solid, and heat transmitted by radiation. By reducing the pressure and eliminating the internal gas, the heat transmitted through the gas can be suppressed, the overall thermal conductivity can be lowered, and the amount of heat dissipated can be reduced.

[Example 1]
Although the detailed preparation methods of the heat insulation container concerning this invention are shown below, this invention is not limited to this.
The inner container 1 uses a rectangular parallelepiped polyethylene container having an inner volume of about 2.6 L and a wall thickness of 8 mm, and a liquid inflow / outlet portion having an outer diameter of 18.5 mm, an inner diameter of 13 mm, and a height of 30 mm on one surface of the inner container 1. 5 and a polyethylene filler 6 shown in FIG. 5 having a height of 10 mm was formed in the outflow inlet portion 5 at a position 10 mm from the upper surface of the liquid outflow inlet. An ABS resin was formed on the surface of the inner container 1 excluding the filler 6, and then an electroless nickel plating layer and further an electrolytic copper plating layer were formed as a gas barrier layer.
The laminate film to be the exterior material 3 is a polyethylene terephthalate layer (12 μm) to be the protective layer 8 / nylon layer (15 μm) to be the protective layer 9 / aluminum foil (6 μm) to be the gas barrier layer 10 / polyethylene layer to be the adhesive layer 11 A multilayer structure having a thickness of 50 μm was used.
As the fiber heat insulating material 2, white wool made of Asahi Fiber Glass was used, and as the gas adsorbent 4 (getter material), COMBO3GETTER made by SAES Getters was used.

Glass wool is coated around the polyethylene container, which is the inner container 1, to a thickness that is the position of the lower surface of the filler 6 provided at the outflow inlet portion 5 of the inner container 1. The density of the glass wool at this time was about 0.25 g / cm ² with respect to the surface area of the inner container 1. Next, the bonding surface of the laminate film to be the two outer packaging materials 3 is opposed to the filler 6 provided in the liquid outflow / inlet portion 5 of the inner container 1, and the joint portion 7 is sealed with a sealer as shown in FIG. The position of was adjusted to 160 ° C. and held for 6 seconds in a pressurized state. Thereafter, the side surface of the laminate film to be the exterior material 3 was heat-welded by applying pressure for 6 seconds at a temperature of 160 ° C. using an ordinary sealer, as described above. Film) was heat-welded on three sides except the bottom to form a bag. Further, it was left in an oven at 120 ° C. for 24 hours to evaporate water contained in the glass wool.
After drying, it is carried into a chamber with an argon atmosphere, and after the getter material to be the gas adsorbent 4 is loaded from the bottom where the exterior material 3 is opened (about 7 g), the pressure inside the chamber is reduced to 10 Pa, and the exterior The open part of the material 3 was joined and sealed by a heater provided in a vacuum chamber, and a heat insulating container having a vacuum heat insulating layer having a thickness of 10 mm was manufactured. This is Example 1.
About 100 ° C. warm water is poured into the heat insulation container of Example 1 above, left to stand for about 10 minutes, then discarded, and about 100 ° C. warm water is poured again into the heat insulation container, and a thermocouple is inserted from the liquid outflow inlet to the outflow inlet. The part was closed with a rubber stopper. The water temperature was measured continuously for 12 hours starting from the time when the water temperature in the heat insulation container reached 95 ° C.

[Comparative Example 1]
As Comparative Example 1, a metal double-pipe structure in which a stainless steel plate having a thickness of about 0.5 mm is used for both the inner container and the outer container, and a vacuum heat insulating layer is provided between the inner container and the outer container. It was used. Moreover, the fluid spout of the heat insulation container of the comparative example 1 has a structure insulated by the cover material, and the heat radiation from the fluid spout is suppressed.
About 100 ° C. warm water having the same capacity as in Example 1 was poured into the heat insulation container of Comparative Example 1 and allowed to stand for 10 minutes. After that, about 100 ° C. warm water was poured again into the heat insulation container, and a thermocouple was placed in the heat insulation container. After inserting, the spout was closed. The water temperature was measured continuously for 12 hours starting from the time when the water temperature in the heat insulation container reached 95 ° C.

[Measurement result]
The measurement results of Example 1 and Comparative Example 1 are shown in FIG.
In Example 1 (insulated container of the present invention), 95 ° C. warm water was maintained at about 83 ° C. after 12 hours. In Comparative Example 1, the temperature after 95 ° C. warm water was passed for 12 hours was about 78 ° C. It was. As a result, it was proved that the heat insulation container according to Example 1 had a heat insulation performance equal to or higher than that of Comparative Example 1. In addition, the heat insulation container of the metal double-pipe structure used as the said comparative example 1 is a commercially available thermos bottle type, and the internal container and the external container use the stainless steel plate about 0.5 mm thick, and the internal container and the external It has a structure in which a vacuum heat insulating layer is provided between the containers. Moreover, the fluid spout of the heat insulation container of the comparative example 1 has a structure insulated by the cover material, and the heat radiation from the fluid spout is suppressed.

[Example 2]
Next, as Example 2, a specific example in which the winding amount of the glass wool 2 is determined from the heat insulating performance required for the heat insulating container will be introduced.
For example, a vacuum insulation layer having a thickness of 10mm in winding amount of 0.25 g / cm ^2, and the vacuum heat insulating layer having a thickness of 5mm at 0.13 g / cm ^2, the vacuum insulation thickness 15mm at 0.38 g / cm ² When the water temperature after 12 hours was measured in each insulated container provided with layers, the water temperature after 12 hours was about 70 ° C. in the case of 5 mm thickness, about 78 ° C. in the case of 10 mm thickness, and about 82 ° C. in the case of 15 mm thickness. The result was ℃.

[Example 3]
Moreover, although the example of the combination of the material of the heat insulation container which concerns on this invention is shown as Example 3, this invention is not limited to this.
Example (A)
・ Inner container: Stainless steel ・ Filling material: Stainless steel (processed)
-Adhesive layer: ethylene-vinyl alcohol copolymer Example (B)
・ Inner container: Stainless steel ・ Filling material: Ethylene-vinyl alcohol copolymer ・ Adhesive layer: Ethylene-vinyl alcohol copolymer Example (C)
・ Inner container: Polyethylene ・ Filling material: Polyethylene ・ Adhesive layer: Polyethylene Example (D)
・ Inner container: Polypropylene ・ Filling material: Polypropylene ・ Adhesive layer: Polypropylene
Example (E)
・ Inner container: ABS resin / filler: ABS resin (processed) + metal coating / adhesive layer: ethylene-vinyl alcohol copolymer

  INDUSTRIAL APPLICABILITY According to the present invention, it can be used as a heat insulating container that retains and retains liquid, and is particularly applicable to a heat insulating container that retains and retains LLC of a vehicle engine. In addition, it can also be used for a heat retaining container such as an electric pot or a cold container such as a liquid gas.

Sectional drawing which shows the example of a heat insulation container which concerns on this invention. Sectional drawing which shows the example of a heat insulation container which concerns on this invention. Sectional drawing which has arrange | positioned the filler in the junction part of an inner container and an exterior material (A-A 'sectional drawing of FIG. 1). Sectional drawing which shows the example of a shape of a filler. Sectional drawing which shows the example of a shape of a filler. Sectional drawing which shows the example of a shape of a filler. The schematic diagram of the laminate film which is an exterior material. Explanatory drawing which shows the joining method of the junction part of an inner container and an exterior material. Explanatory drawing which shows the preheating of the junction part of an inner container and an exterior material. The graph which shows the measurement result of Example 1 and Comparative Example 1.

Explanation of symbols

1: Inner container 2: Fiber insulation (glass wool)
3: Exterior material (laminate film)
4: Adsorbent (getter material)
5: Liquid inlet / outlet 6: Filler 7: Joint 8: Protective layer (nylon layer)
9: Protective layer (base material layer) (polyethylene terephthalate layer)
10: Gas barrier layer (aluminum foil)
11: Adhesive layer (ethylene vinyl alcohol layer)
12: High heat resistant rubber 13: Ribbon-shaped metal heater 14: Glass cloth 15: Hot air nozzle 16: Hot air

Claims (6)

  A heat insulating container that retains and retains a liquid, and includes an inner container that has a liquid inlet and outlet and stores the liquid, a sheet-like exterior material that accommodates the inner container, and a space between the inner container and the exterior material. A heat insulating container comprising: a heat insulating space enclosed with a heat insulating material and a gas adsorbing material;   The insulated container according to claim 1, wherein the inner container is made of stainless steel or resin, and the exterior material is a laminated film provided with an adhesive layer.   The heat insulating container according to claim 1, wherein a filler is provided at a joint portion between the inner container and the exterior material.   4. The heat insulating material is an inorganic fiber of glass wool, rock wool, or ceramic fiber, and the adsorbent is made of calcium oxide, barium / lithium alloy, and cobalt oxide. Insulated container as described in 2.   A method for manufacturing a heat insulating container that retains and retains a liquid, wherein the liquid is stored therein and includes an inlet and an outlet for the liquid, and an insulating space is provided between the inner container and the inner container. A sheet-shaped exterior material to be formed, and a heat-insulating material and a gas adsorbing material are enclosed in the heat-insulating space to form a decompression space, and a filler is provided at a joint portion between the exterior material and the inner container to be joined. The manufacturing method of the heat insulation container characterized by the above-mentioned.   A method for manufacturing a heat insulating container that retains and retains a liquid, wherein the liquid is stored therein and includes an inlet and an outlet for the liquid, and an insulating space is provided between the inner container and the inner container. A sheet-shaped exterior material to be formed, and the heat insulation material and the gas adsorbing material are enclosed in the heat insulation space to form a decompression space, and the inside of the joint portion of the inner container to be joined to the exterior material is preheated And heat-welding the joint part.

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