JP2000310465A - Heat insulating composite material provided with cold insulation performance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of manufacture, and to improve cold installing power, by comprising a cold insulating member and a heat insulating member, and by obtaining the cold insulating member after using an absorbing material to absorb cold insulating liquid. SOLUTION: A heat insulating composite material comprises a heat insulating container 41, a heat insulating lid 42, and a cold insulating member 43. The producing method of the cold insulating member 43 is to obtain it by allowing an absorptive material to absorb cold insulating liquid comprising water, alcohol and the like, ester and the like, etc. In order to prevent the outflow of the cold insulating liquid, the outside of the cold insulating member 43 is coated with a sealing film 44. The heat insulating member comprising plastic foam, a corrugated board, mineral fiber, etc., is divided into two parts which are the heat insulating container 41 and the heat insulating lid 42. The filling method of the heat insulating composite material is coating the cold insulating member 43 with the sealing film 44, putting it in the heat insulating container 41, and then putting on the heat insulating lid 42. The heat insulating container 41 and the heat insulating lid 42 are preferably bound sufficiently. As a result, the cold insulating member 43 is completely embedded inside to become the external wall of the whole composite material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-insulating composite material having a cooling effect, and more particularly to a method of controlling the thickness of a heat-insulating member and the amount (amount or volume) of a cooling solution which is convenient to manufacture. The present invention relates to a heat insulating composite material that controls the temperature of a chilled product and the time for keeping cold.

[0002]

2. Description of the Related Art Heretofore, a method of transporting refrigerated goods by directly loading the refrigerated goods on a refrigerated vehicle has been adopted. FIG. 1 shows a vehicle body 1 of a general refrigerator car, which is constructed by assembling six plates such as a ceiling 1A, a floor 1B, a front protection plate 1C, a rear protection plate 1D, and left and right side plates 1E each having the same heat insulation structure. . The structure of this plate is filled with polyurethane (PU) foam insulation material 12 between two layers of sturdy plates 10 and 11, thereby achieving an insulation effect. At the same time, the refrigeration main unit 3 is added and driven by using the engine or the electric power of the car, thereby lowering the temperature of the vehicle space S and the refrigeration stored therein. The refrigeration main unit 3 uniformly distributes cool air by adding a fan 4 to the air blowing port and forcibly ventilating the air. In order to enhance the refrigeration effect of the refrigerated vehicle, a low-temperature environment may be maintained by adding a cooling pipe or a consumable material such as dry ice or ice to the vehicle space S to absorb heat.

[0003] A refrigerating car having a cooling function is disclosed in the Republic of China Patent No. 325016, and the left and right side plates 1 shown in FIG.
The structure of E is improved. In FIG. 2, the left and right side plates 1E
(Arranged from the inside to the outside of the vehicle)
It includes a cooling member 25, a heat insulating member 22, and a metal plate 21. The cold insulator 25 includes a heat exchanger pipe 23 and a cooler 24, and the heat exchanger pipe 23 allows the coolant inside the cold insulator 25 to pass through and exchanges heat with the coolant. Cooling member cover plate 240
Is made of metal and is formed in such a manner that the heat absorption rate can be increased. The heat insulating member 22 is formed of the metal plate 21, the both-side protection plates 211, and a heat-insulating and heat-retaining material filled in a space defined by the both-side protection plates 211.

[0004] Generally, before using a refrigerated refrigerated vehicle or a warm box, the chill agent is first frozen and solidified.
In the course of refrigerated transportation, the frozen storage medium absorbs heat from the external environment and slowly defrosts. This is called an endothermic effect of the cooling medium, and can maintain the temperature of the refrigerated material. However, if the refrigerant medium after thawing is liquefied and its specific gravity is different from that of the frozen refrigerant medium, the flow will cause the heat absorption process to freeze and the melted refrigerant liquid layer to become non-uniform, causing a localized portion of the space to store the refrigerated material. A situation occurs where the temperature is too high.

[0005] Furthermore, the use of refrigerants that are not suitable for storage at too low a temperature, such as rice or vegetables susceptible to cold damage, causes a change in quality due to an excessively low temperature, resulting in loss of commercial value. I will. In addition, when manufacturing a conventional refrigerated refrigerator or a heat retaining box, the cooling process must be filled in a container made of a durable plate to constitute the entire cooling component, and the manufacturing process is complicated. Moreover, once the production of the cold insulator is completed, changing the dose of the cold insulator is extremely labor consuming.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a heat-insulating composite material which is convenient to manufacture, has a low cost, and has a cold-holding power in contact with a refrigerated object. .

[0007]

In order to achieve the object of the present invention, a heat insulating composite material having a cooling power according to the present invention comprises: a cooling member; a heat insulating member which is bonded to the cooling member;
Wherein the cold insulation member is obtained after absorbing the cold insulation liquid using an absorbent material. This composite material can be made into a plate shape and directly adhered to the inner wall of the container, or can be made into a block shape and left in the container.
By bringing the heat insulating member into contact with the refrigerated material when left, the purpose of controlling the heat absorption rate and achieving the purpose of keeping the cold can be achieved. The thickness of the heat insulating member and the amount of the cooling liquid can be adjusted according to the temperature and time to be maintained, which is very convenient. In addition, since the cooling liquid is absorbed by an appropriate absorbing material and does not have fluidity, the phenomenon of freezing during the heat absorption process and the unevenness of the melted cooling liquid layer and the local temperature in the container for storing the refrigerated material are high. It is possible to prevent the situation of being too long.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method, features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings and some examples, but these are not limitative of the present invention in any way. The protection scope of the present invention is based on the contents specified in the claims. FIG.
1 is a schematic cross-sectional view of a heat insulating composite material having a cooling performance according to a first preferred embodiment of the present invention. The heat insulating composite material includes a heat insulating member 31 and a cold insulating member 32, both of which are in contact with each other. The cooling member 32 is obtained after absorbing the cooling liquid with the absorbing material.

What can be applied to the heat insulating member of the present invention is plastic foam, cardboard, heat insulating fiber, mineral fiber,
Examples include porous plates, pearlite particles, fine particles having fine pores, and the like. According to the present invention, when an article is to be kept at a low temperature for a long time using the heat insulating composite material of the present invention, the composite material is first frozen, and the cooling liquid contained therein is frozen to be solid. As described above, when the cooling liquid is thawed to become a liquid and becomes an endothermic action, the liquid is absorbed by the absorbent material and does not flow arbitrarily. It is possible to prevent a situation where the local temperature in the container for storing objects is too high.

What can be applied to the cooling liquid of the present invention is water,
Inorganic salt solutions, alcohols, esters, aqueous solutions of alcohols, aqueous solutions of esters, and the like, and those applicable to the above-mentioned absorbent material, sodium polypropyleneate,
Absorbent polymers such as absorbent cotton, paper pulp and fiber. In order to prevent the cold insulation liquid from flowing out or to strengthen the connection between the heat insulation member and the cold insulation member, as described above, the heat insulation member 3 is used.
1 and the cooling member 32 are brought into contact with each other, and further covered with a sealing film 33. What can be applied to the sealing film of the present invention, polyethylene film, polypropylene film,
It is a polymer film such as a polyvinyl chloride film and a polyester film.

As shown in FIG. 3, the heat-insulating composite material of the present invention can be achieved in the form of a plate and directly adhered to the inner wall of the container, thereby achieving the purpose of heat absorption and cooling. The method of sticking is to bring the heat insulating member 32 into contact with or adjacent to the inner wall of the container and bring the heat insulating member 31 into contact with the refrigerated material toward the space inside the container. As described above, since the heat insulating member is interposed between the cold insulating member and the chilled product, the heat absorption rate of the cold insulating liquid can be controlled by adjusting the thickness of the heat insulating member. As the thickness of the heat insulating member is larger, the heat absorption rate of the cooling liquid can be reduced, and the temperature of the refrigerated material can be prevented from being too low. In addition, the dose of the cooling liquid can be adjusted as needed. The greater the dose of the refrigerating liquid, the longer the cold holding time can be, or the lower the temperature of the refrigerated product.

It should be noted here that the conventional method for maintaining the cooling temperature for a long time by using the cooling liquid requires that the entire member be constituted by filling the cooling liquid into a container made of a strong plate. And the manufacturing process was complicated,
The present invention does not use a metal plate, and the insulated composite material of the present invention is much more convenient to manufacture than a conventional refrigerated car, since the cooling liquid is absorbed by the absorbent material.

[0013] Further, in the conventional cold storage member of a cold storage vehicle or a heat storage box, once the production is completed, the dose of the cold storage liquid cannot be changed. However, the composite material of the present invention requires the temperature, cold storage, and the like before use. After the thickness of the heat insulating member and the amount of the cooling liquid are determined according to the storage temperature of the object to be heated, the time for absorbing heat (transportation time), and the like, it may be simply attached and assembled.

FIG. 4 is a schematic cross-sectional view of a heat insulating composite material having a cooling performance according to a second preferred embodiment of the present invention. The heat-insulating composite material includes a heat-insulating container 41, a heat-insulating lid 42, and a cooling member 43. The method of manufacturing the cold insulating member is to obtain it after absorbing the cold insulating liquid with the above-described absorbent material. The outside of the cold insulating member 43 can be covered with a sealing film 44 in order to prevent the cold insulating liquid from flowing out. According to this embodiment, the heat insulating member is divided into two parts, a heat insulating container 41 and a heat insulating lid 42. The method of filling the entire heat insulating composite material is as follows:
The heat insulating member 43 is covered with a sealing film 44,
After that, the heat insulating cover 42 is put on the inside of the device. It is preferable that the heat insulating container 41 and the heat insulating lid 42 are sufficiently connected to each other, so that the heat insulating member 43 is completely embedded inside, and the outer wall of the entire composite material is used as the heat insulating member.

The heat insulating member does not necessarily need to contain (contain) the cold insulating member in the form of a container and a lid, and it is also possible to house the cold insulating member in the heat insulating member by other methods. Such an outer layer is a heat insulating member, and the inside is a heat insulating composite material of a cold insulating member. By leaving the inside of the container in a block shape, it is possible to achieve the purpose of keeping the refrigerated material at a low temperature. Similar to the first preferred embodiment, since the heat insulating member is interposed between the cold insulating member and the refrigerator, the heat absorbing rate of the cold insulating liquid can be controlled by adjusting the thickness of the heat insulating member. Is what you can do. Further, the dose of the cooling liquid can be adjusted as required. Similarly, since the heat-insulating composite material is manufactured in the form of a small block, the thickness of the heat-insulating member depends on the temperature at that time, the storage temperature of the object to be refrigerated, the time to absorb heat (transport time), etc. before use. And the dose of the cooling liquid can be determined,
Very convenient.

Based on the dimensions of the container wall of the cold storage container (hexahedron) to be transported, a total of six flat heat-insulating composite materials as shown in FIG. 3 are prepared by the method of the first preferred embodiment of the present invention described above. Made. The six heat-insulating composite materials were brought into contact with the wall of the container with a cooling member, and the heat insulating members were attached to the inner walls on the six sides of the container in such a manner that the heat-insulating member was directed to the space of the container. 120 rice products of 100 g were put in the above-mentioned container in which the heat insulating composite plate was attached to the inner wall. The temperature requirement of this rice product is
It must be maintained between 14 ° C and 22 ° C.
After sealing the container, it was left in a constant temperature box in which hot air of 40 ° C. circulated. As a result of measuring the temperature of the rice product at three different positions adjacent to the insulated composite board in the container using a temperature recorder, the results are as shown in the table below.

[0017]

[Table 1]

As can be seen from the above table, when the heat insulating composite material of the present invention is bonded to the inside of the cold storage container, the temperature of the rice product can be maintained even after 4 hours at 40 ° C. It can be maintained between 14C and 22C. This result indicates that the heat-insulating composite material of the present invention has excellent cooling performance and can keep the refrigerated product at a constant low temperature for a long time.

Although the preferred embodiments of the present invention have been disclosed above, they are not intended to limit the invention in any way, and any person skilled in the art will not depart from the spirit and scope of the invention. Therefore, various modifications and improvements can be made, and the protection scope of the present invention is based on the contents specified in the claims.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a vehicle body of a conventional refrigerator car.

FIG. 2 is a vertical sectional view of left and right side walls of a vehicle body of another conventional refrigerator car.

FIG. 3 is a schematic cross-sectional view of a heat insulating composite material having a cooling performance according to a first preferred embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of a heat insulating composite material having a cooling performance according to a second preferred embodiment of the present invention.

[Description of Signs] 1 Body of refrigerated car 1A Ceiling 1B Floor 1C Front protection plate 1D Rear protection plate 1E Left right side plate 3 Freezing main unit 4 Fan 10, 11 plate 12 Polyurethane (PU) foam insulation material S Vehicle space 21 Metal plate 22, DESCRIPTION OF SYMBOLS 31 Insulation member 23 Heat exchanger pipe 24 Insulator 25 Insulation member 32, 43 Insulation member 33, 44 Sealing film 41 Insulation container 42 Insulation lid 211 Both sides protection plate 240 Cover plate

Claims (11)

[Claims] 1. A cold insulator comprising: a heat insulating member; and a heat insulating member in contact with or adjacent to the cold insulating member, wherein the cold insulating member has a cold insulating performance obtained after absorbing the cold insulating liquid using an absorbent material. Insulated composite member. 2. The composite material according to claim 1, further comprising a sealing film covering the heat insulating member and the cold insulating member together. 3. The composite material according to claim 1, further comprising a sealing film covering the cooling member. 4. The composite material according to claim 3, wherein the outer wall of the heat-insulating composite material is used as a heat-insulating member by housing the cooling member covered with the sealing film in the heat-insulating member. 5. The heat insulation member according to claim 4, wherein the heat insulation member includes a container and a lid, and when the lid is put on the container, the cold insulation member covered with the sealing film is accommodated in the heat insulation member. The composite material as described. 6. The heat insulating member includes a plastic foam, a cardboard, a heat insulating fiber, a mineral fiber, a porous plate,
The composite material according to claim 1, wherein the composite material is manufactured from a material selected from the group consisting of pearlite particles and particles having fine pores. 7. The composite material according to claim 1, wherein said absorbent material is an absorbent polymer. 8. The composite material according to claim 7, wherein said absorbent material is selected from the group consisting of sodium polypropyleneate, water-absorbent cotton, paper pulp, and fiber. 9. The composite material according to claim 1, wherein the cooling liquid is selected from the group consisting of water, an inorganic salt solution, alcohols, esters, an aqueous solution of alcohols, and esters. 10. The composite material according to claim 2, wherein the sealing film is a polymer film. 11. The composite material according to claim 10, wherein the sealing film is selected from the group consisting of a polyethylene film, a polypropylene film, a polyvinyl chloride film, and a polyester film.