JP2007118972A - Constant temperature cold box and method for keeping cold at constant temperature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a constant temperature cold box capable of keeping an object cold within a predetermined cold-insulated range for many hours, and a method for keeping the object cold at a constant temperature. <P>SOLUTION: The constant temperature cold box 1 is constituted of an outer cold-insulated box 11, a lid 12 and partitions 13. In this case, the partitions 13 separate the inside of the box 11 into a first space 14 where a storage container 32 of an object 31 to be kept cold at a constant temperature and a cold storage material 21 placed to surround the storage container can be stored and a second space 15 where dry ice 22 can be stored. The storage container 32 containing the object 31 and the cold storage material 21 surrounding the container 32 are stored in the first space 14, and the dry ice 22 is stored in the second space 15. The partition 13, the material 21 and walls of the storage container 32 serve as cushioning media to keep the object 31 in the vicinity of a freezing temperature of the material 21 by the cold of sublimation of the dry ice 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a constant temperature cool box and a constant temperature cool method, and in particular, to a constant temperature cool box capable of maintaining a constant temperature for a long time using dry ice as a cold heat source and a cold storage material and a partition wall as a temperature buffer material, and the constant temperature cool box. It relates to the constant temperature and cold insulation method.

  Conventionally, low temperature distribution is demanded in foods and pharmaceuticals, and various low temperature distribution techniques have been developed. The temperature range of the low-temperature circulation varies depending on the object, and when classified broadly, it is classified into two types of freezing and refrigeration, but the appropriate temperature range also varies depending on the object. In the case of storage, refrigerators and freezers are often prepared during the distribution process and can be stored at an appropriate temperature. In this case, cooling by a refrigerator is the mainstream, and refrigeration / refrigeration trucks, low-temperature containers, etc. are introduced in transportation, and the response from the starting point to the arrival point is carried out by a single means of transportation.

  However, when land routes, sea routes, and air routes are combined as in intercontinental transportation, even if there are transportation means that do not have low temperature holding means inside, and even if each has low temperature holding means, Low temperature distribution means may be underdeveloped. In this case, when the transportation means without the low-temperature holding means or the relay time becomes long, the rise in the product temperature is unavoidable, and a problem occurs in a target having a severe temperature condition. Especially for high-priced products, the damage was not negligible.

  As a method of keeping cold at a low temperature without using a refrigerator when movement is required, storing a cold storage material or dry ice as a refrigerant in the same container is performed.

  Patent Document 1 discloses a method of supplying and transporting dry ice and a regenerator material in a foldable cold storage container, and a regenerator material having a melting point of -20 to -40 ° C and a latent heat of fusion of 40 to 70 kcal / kg. It is desirable to use.

  Patent Document 2 discloses a cold insulation package that can be cooled and transported for a long period of time without overcooling the cold insulation product, while suppressing consumption of the refrigerant and preventing partial overcooling or partial cooling shortage of the cold insulation product. A container is disclosed. The cold insulation packaging container is composed of an outer box, a cold insulation inner bag enclosed in the outer box, and a refrigerant storage container that can be accommodated leaving a space in the cold insulation inner bag, and the cold insulation inner bag and the refrigerant accommodation container are made of metal. It is formed of a multilayer sheet consisting of an inner layer and a heat insulating outer layer. Here, it is assumed that the temperature difference in the cold storage product storage portion is within 30 ° C., and the temperature change after 72 hours in the cold storage product storage portion is within 10 ° C.

Patent Document 3 discloses a multi-compartment cold storage container that divides one cold storage container into two or more compartments having different cold storage temperatures in order to store and store objects to be cooled having different cold storage temperatures. It has a partition wall that increases the thickness of any or all of the side wall, bottom surface, and lid of the container body in the low temperature side compartment of the multi-compartment cold storage container and separates the low temperature and high temperature compartments. Here, a plate or space for placing a refrigerant is provided in each section.
JP 2004-196410 A JP 2003-160173 A JP 2005-104567 A

  As described above, the temperature range for low-temperature circulation is broadly classified into two types, refrigeration and refrigeration, and it is customary to use refrigeration and refrigeration containers separately from refrigeration and refrigeration. Or dry ice is used as a refrigerant. In this case, if the cooling is excessive, the quality is deteriorated due to a low temperature failure. If the cooling is insufficient, the quality may be deteriorated due to the temperature rise.

  In the delivery of refrigerated goods, it is the mainstream to use a regenerator material, but when using a regenerator material, it is necessary to freeze the regenerator material in advance at a temperature lower than the melting point of the regenerator material. When a cold storage material having a melting point lower than the holding target temperature is used, or when the precooling temperature is low, the temperature in the cold storage container rapidly decreases immediately after the cold storage material is introduced into the cold storage container. For this reason, some products may cause serious defects and cause problems such as low temperature failure. Moreover, it was practically difficult to maintain a constant temperature for 12 hours or more only with the cold storage material.

  On the other hand, when dry ice is used in the delivery of refrigerated products, there is a problem that a product that should not be frozen is frozen due to its characteristic that the sublimation temperature is -78.5 ° C.

  In addition, depending on the object, for example, the temperature of the object being transported, the allowable temperature range, and the constant temperature holding time are limited in medicines and special resins. Cold transport corresponding to these conditions is required.

  In the method disclosed in Patent Document 1, according to the example, 0.8 kg of a cold storage material having a melting point of -21 ° C. and 0.5 kg of granular dry ice were used in a polyethylene container having a plate thickness of 25 mm and an internal volume of 15 l. The product temperature which decreased to -38 ° C in the test rises to -15 ° C in 6 hours. Therefore, although it can be used in the refrigerated region, the test results in the refrigerated region are not disclosed, and it seems difficult to keep the temperature constant in the refrigerated region.

  In the cold insulated packaging container disclosed in Patent Document 2, although the temperature rise is described, there is no specific description about keeping the cold for a long time at a predetermined temperature, and it seems difficult to keep the temperature constant in the refrigerated region.

  The multi-compartment cold storage container disclosed in Patent Document 3 is suitable for cold storage of objects having different cold storage temperatures, but there is no disclosure about performing cold storage at a predetermined temperature for a long time.

  An object of the present invention is to provide a constant temperature cold box and a constant temperature cold storage method that can cool an object for a long time in a predetermined cold temperature range.

The constant temperature cold box of the present invention is
A constant temperature and cold box for storing a constant temperature and cold object to be stored in a containment container, a box-shaped cold outer box formed from a bottom wall and a side wall made of a heat insulating material, and a material having a heat insulating property And a lid that can be removably fitted into the upper opening of the cold insulation outer box, and the inside of the cold insulation outer box can store the storage container and the cold storage refrigerant disposed around the storage container. A partition wall that separates into a first space and a second space in which dry ice can be stored is provided.

  There may be provided two partition walls separating the first space arranged in the center and the second space arranged on both sides, the partition wall may be removable, and the partition wall is heat insulating. The material having thermal insulation may be a foamed plastic. The thickness of the material having heat insulation properties may be set corresponding to the constant temperature and cold temperature of the constant temperature and cold object. The cold storage refrigerant may be a cold storage material that solidifies at a predetermined solidification temperature and stores cold heat.

The constant temperature cooling method of the present invention is:
A constant temperature and cold insulation method for keeping a constant temperature and cold object to be stored in a containment container at a constant temperature within a predetermined temperature range for a predetermined time using the above-mentioned constant temperature and cold box. The step of storing in a containment vessel made of a heat-insulating material, and the containment vessel are kept cool by surrounding them with a pre-cooled refrigerant for cold storage whose solidification temperature is set in accordance with the constant temperature keeping temperature of the object to be kept at a constant temperature. The step of storing in the first space of the outer box part, the step of storing dry ice in the second space, the step of covering the cool outer box part with the lid and completing the constant temperature cold box, the completed constant temperature cold box Transporting and / or storing the box over a predetermined time.

  The temperature for keeping the constant temperature cold object over a predetermined time is 5 ° C. ± 3 ° C., the predetermined time for transportation and / or storage is 30 hours, and the solidification temperature of the regenerator material is 0 ° C. Also good.

  Since the constant temperature cold storage object is in contact with the cold storage material in the first space through the wall surface of the storage container, if the storage container is made of a heat insulating material, the cold storage material that defrosts at a predetermined solidification temperature and Is maintained at a predetermined temperature within a predetermined temperature range by gentle heat conduction. Since the cool storage material in the first space and the dry ice in the second space are in contact with a partition wall made of a heat insulating material as a buffer material, the temperature of the cool storage material does not drop rapidly. Sublimation is suppressed because there is little increase in the temperature of the second space and dry ice also has little heat dissipation. The heat from the dry ice is accumulated as latent heat in the regenerator material and transmitted to the constant temperature cold object through the wall surface of the storage container.

  The constant temperature cold box of the present invention includes a cold outer box made of a heat-insulating material, a lid, and a partition wall that separates the interior into a first space and a second space. An object to be kept at a constant temperature is stored in a containment container made of a heat insulating material, and the containment container is surrounded by a cool storage material and stored in a first space, and dry ice is stored in a second space for transportation or storage. Is done. Therefore, the dry ice and the regenerator material are brought into contact with each other across the partition wall, so that the temperature of the regenerator material does not rapidly decrease and sublimation is suppressed because the dry ice also radiates less heat. The constant temperature cold object is also in contact with the cold storage material through the heat insulating wall of the containment vessel, so that even if the temperature of the cold storage material is initially low, the temperature of the constant temperature cold object is prevented from changing rapidly. The Since the cold storage material is gradually thawed at the thawing temperature, the temperature of the constant temperature cold object is maintained at a predetermined temperature, and the cold heat entering through the partition wall by sublimation of dry ice is absorbed as latent heat by the cold storage agent. After dry ice disappears due to sublimation of dry ice and the cooling capacity is lost, the cold storage material suppresses the temperature rise inside the constant temperature cold box. Since it has such a function, there is an effect that it is possible to stably maintain a constant temperature state over a long period of time with a constant temperature and cold object.

  In addition, the constant temperature cold box can be manufactured by molding foamed plastic, so the cost is low. The amount of cold storage material and dry ice can be adjusted according to the cold condition, and the partition wall can be removed to make it normal. Diversion to a cold box is also possible. Therefore, there is an effect that it is possible to reduce the constant-temperature cooling cost as a whole.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view of a constant temperature cold box according to an embodiment of the present invention. 2 is a schematic cross-sectional view of the constant temperature cold box of FIG. 1, and FIG. 3 is a schematic cross sectional view of the constant temperature cold box of FIG. 1 in which a constant temperature cold object, a cold storage material, and dry ice are stored.

  The constant temperature cold box 1 includes a cold outer box 11, a lid 12, and a partition wall 13. The cold insulation outer box portion 11 is formed in a box shape by a bottom wall and a side wall made of foamed plastic. The lid portion 12 is made of foamed plastic and is detachably aligned with the upper opening of the cold insulation outer box portion 11. The partition wall 13 separates the inside of the cold insulation outer box portion 11 into a first space 14 and a second space 15. In the first space 14, the storage container 32 of the constant temperature cold object 31 and the regenerator material 21 arranged so as to surround the storage container 32 can be stored. In the second space 15, dry ice 22 can be stored. Here, these materials are made of polystyrene foam, but the material is not limited to this, and any material having a predetermined heat insulating property may be used, and it may be composed of a multilayer material. Further, in this embodiment, the second space 15 is provided on both sides of the first space 14, but the first space 14 and the second space 15 are used when the cooling condition is not strict or the amount is small. The structure which only isolate | separated by 1 partition wall 13 may be sufficient. Although the partition wall 13 can be removed, it may be integrated with the cold insulation outer box portion 11, and a plurality of fitting portions may be provided to change the ratio between the first space 14 and the second space 15. You may do it.

  Next, the constant temperature cooling method for the constant temperature cold object 31 using the constant temperature cold box 1 will be described. First, the solidification temperature of the regenerator material is selected according to the cold temperature of the constant temperature cold object 31. For example, when the cold insulation temperature is + 5 ° C., the cold storage material 21 having a solidification temperature of 0 ° C. is desirable. When the cold insulation temperature is in the freezing region, the cold storage material 21 having a solidification temperature lower than that temperature is selected. Next, the amount of heat released per hour is calculated from the surface area of the constant temperature cold box 1 and the outside air temperature, the average internal temperature of the constant temperature cold box 1 and the average heat transmissivity, and the amount of cooling heat required for the desired constant temperature hold time is calculated. . Each required amount is calculated from the solidification latent heat of the regenerator 21 and the sublimation latent heat of the dry ice 22 based on the required amount of cooling heat. In this case, the sublimation latent heat of the dry ice 22 is mainly used, and the cool storage material 21 has many elements as a cushioning material. Based on the calculated result, it has the 1st space 14 which can store the storage container 32 and the required heat storage material 21 of the thermostat object 31, and the 2nd space 15 which can store the required dry ice 22. A constant temperature cold box 1 is selected.

  First, the constant temperature and cold object 31 is stored in a storage container 32 made of a material having heat insulation properties. The first space of the cold insulation outer box portion 11 of the constant temperature cold box 1 is surrounded by a precooled cold storage material 21 whose solidification temperature is set corresponding to the constant temperature cold temperature of the constant temperature cold object 31. 14 and the dry ice 22 is stored in the second space 15. In this case, as shown in FIG. 3, the storage container 32 is held by the support member 23, the cold storage material 21 is also disposed on the bottom surface side of the storage container 32, and the cold storage material 21 is disposed on the six surfaces of the storage container. desirable. A commercially available plate type can be used for the cold storage material 21. The dry ice 22 may be in the form of pellets, but the plate-shaped dry ice 22 may be wrapped with paper and placed on the support member 23 as shown in FIG.

  When the cover 12 is put on the cold insulation outer box 11 containing the storage container 32, the cold storage material 21, and the dry ice 22, the constant temperature cold insulation box 1 is completed. Therefore, packaging is performed as necessary, and predetermined external temperature conditions are satisfied. And transported and / or stored for a predetermined time. The constant temperature cold object 31 is maintained near the solidification temperature of the cold storage material 21 by thawing the heat insulating wall surface of the storage container 32 and the cold storage material 21. Since the thawed cold storage material 21 is solidified again by the cooling heat by the sublimation of the dry ice 22 across the partition wall 13, the constant temperature cold object 31 is kept cold under the same conditions until the dry ice 22 is completely sublimated. After all the dry ice 22 has sublimated, the constant temperature cold object 31 is maintained at a constant temperature until the latent heat accumulated in the cold storage material is consumed.

  Although it is difficult to keep at a constant temperature under refrigeration conditions near 0 ° C. as compared with the freezing conditions, if the regenerator material 21 with a solidification temperature of 0 ° C. is used, even if the ambient temperature is 30 ° C., the constant temperature keeping object 31 is + 5 ° C. ± 3 It was possible to hold at 30 ° C. for 30 hours. If the thickness of the heat insulating wall of the constant temperature cold box 1 is changed and the cold storage material 21 is of a low solidification temperature type, the frozen product can be transported for a long time.

  Next, an experimental example of the present embodiment will be described. Using a constant temperature cold box (partition plate: made of polystyrene foam with a thickness of 30 mm) made of polystyrene foam with a thickness of 50 mm and outer dimensions of W725, L425, and H475, the environmental temperature is 30 ° C., the target temperature of the constant temperature cold object is + 5 ° C. The test was conducted at ± 3 ° C. for 50 hours. The cold storage material used at this time was 10 pieces of 800 g of Adeka Top 1-8 (trade name) and 10.24 kg of dry ice. FIG. 4 is a graph showing the temperature course of the experimental example of the constant temperature cold box at that time. In this case, the sample temperature was slightly lower but did not exceed 5 ° C. This average temperature can be adjusted by adjusting the amount of the regenerator material and the thickness of the partition wall. Note that 3.52 kg of dry ice remained after the 50-hour test, and the actual amount used was 6.72 kg.

It is a typical perspective view of the constant temperature cool box of embodiment of this invention. It is typical sectional drawing of the constant temperature cool box of FIG. It is typical sectional drawing of the constant temperature cool box of FIG. 1 in which the constant temperature cool target object, the cool storage material, and dry ice were stored. It is a graph which shows progress of the temperature of the experiment example of a constant temperature cool box.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Constant temperature cold box 11 Cooling outer box part 12 Cover part 13 Partition wall 14 1st space 15 2nd space 21 Cold storage material 22 Dry ice 23 Support material 31 Constant temperature cold storage object 32 Containment container

Claims (9)

A constant temperature and cold box for storing a constant temperature and cold object to be stored in a containment vessel,
A box-shaped cold outer case formed of a bottom wall and a side wall made of a material having heat insulation properties;
A lid portion made of a material having heat insulation properties and detachably fitted into an upper opening of the cold insulation outer box portion;
The inside of the cold insulation outer box portion is separated into a first space that can store the storage container and a refrigerant for storing cold that is disposed surrounding the storage container, and a second space that can store dry ice. A constant temperature and cold box provided with a partition wall.   The constant temperature cold box of Claim 1 provided with the said 2 partition walls which isolate | separate the said 1st space arrange | positioned in the center, and the said 2nd space arrange | positioned at both sides.   The constant temperature cold box according to claim 1 or 2, wherein the partition wall is removable.   The constant temperature cold box according to any one of claims 1 to 3, wherein the partition wall is made of a heat insulating material.   The constant temperature and cold box according to any one of claims 1 to 4, wherein the heat insulating material is foamed plastic.   The constant temperature cold box according to any one of claims 1 to 5, wherein a thickness of the heat insulating material is set corresponding to a constant cold temperature of the constant temperature cold object.   The constant temperature cold storage box according to claim 1, wherein the cold storage refrigerant is a cold storage material that solidifies at a predetermined solidification temperature and stores cold heat. Using the constant temperature cold storage box according to any one of claims 1 to 7, the constant temperature cold storage object stored in the storage container is cooled at a constant temperature within a predetermined temperature range for a predetermined time. A constant temperature cooling method for
Storing the constant temperature cold object in the containment vessel made of a material having heat insulation properties;
Storing the containment vessel in the first space of the cold insulation outer box portion by surrounding the periphery with a pre-cooled refrigerant for cold storage in which the solidification temperature is set corresponding to the constant temperature cold preservation temperature of the object to be kept at constant temperature. When,
Storing dry ice in the second space;
Covering the cold insulation outer box with a lid to complete the constant temperature cold box; and
Transporting and / or storing the completed constant temperature cold box over a predetermined time, and a constant temperature cold storage method using the constant temperature cold box.   The temperature for keeping the constant temperature cold object over a predetermined time is 5 ° C. ± 3 ° C., the predetermined time for transportation and / or storage is 30 hours, and the solidification temperature of the cold storage material is 0 ° C. A constant temperature and cold insulation method using the constant temperature and cold box according to claim 8.

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