WO2007049380A1 - Constant-temperature cold-reserving box and method of reserving cold at constant temperature - Google Patents

Abstract

A constant-temperature cold-reserving box in which an object can be kept cool over long within a given low-temperature range. The constant-temperature cold-reserving box (1) comprises a cold-reserving outer box (11), a lip part (12), and partitions (13). The partitions (13) separate the inside of the cold-reserving outer box (11) into a first space (14) and a second space (15). In the first space (14) are placed a housing container (32) containing an object (31) to be kept cool at a constant temperature and cold-storage materials (21) by which the housing container (32) is surrounded. In the second space (15) is placed dry ice (22). Due to the cold generated by the sublimation of the dry ice (22), the temperature of the object (31) is kept at around the solidifying temperature of the cold-storage materials (21), with the partitions (13), cold-storage materials (21), and walls of the housing container (32) serving as buffer materials.

Description

 Specification

 Constant temperature cool box and constant temperature cool method

 Technical field

 [0001] The present invention relates to a constant temperature cold box and a constant temperature cold storage method, and in particular, using dry ice as a cold heat source.

In addition, the present invention relates to a constant temperature cold box that can maintain a constant temperature for a long time using a cold storage material and a partition wall as a temperature buffer material, and a constant temperature cold storage method using the constant temperature cold box.

 Background art

 Conventional power Low temperature distribution is required for foods and pharmaceuticals, and various low temperature distribution technologies have been developed. The temperature range for low-temperature circulation varies depending on the target. Broadly classified, it is classified into two types: frozen and refrigerated, but the appropriate temperature range among them varies depending on the target. In the case of storage, refrigerators and freezers are prepared during the distribution process, and storage at an appropriate temperature is often possible! In this case, cooling by a refrigerator is the mainstream. Refrigeration / refrigeration trucks, low temperature containers, etc. have also been introduced in transportation, and responses are being made in the case where transportation from the starting point to the arrival point is carried out by one means of transportation.

 [0003] However, when land routes, sea routes, and air routes are combined as in intercontinental transportation, there are transportation means that do not have a low temperature keeping means in the route, or there are low temperature keeping means in each transportation means. Even if it is provided, the low-temperature circulation means at the relay point may be underdeveloped. If the means of transportation does not have a low temperature holding means or if the relay time is long, the product temperature will inevitably rise, and the temperature conditions will be severe, and there may be problems with the transportation object. Especially for high-priced products, the damage cannot be ignored.

 [0004] In the case where movement is required, as a method of keeping cold at a low temperature without using a refrigerator, storing a cold storage material or dry ice as a refrigerant in the same container is performed.

 [0005] Japanese Unexamined Patent Application Publication No. 2004-196410 discloses a method of transporting dry ice and a cold storage material by supplying them to a foldable cold storage container and having a melting point of −20 to −40 ° C. and latent heat of fusion. However, it is desirable to use a cold storage material of 40-70kcalZkg! /, And! /

[0006] Japanese Patent Laid-Open No. 2003-160173 discloses that the consumption of the refrigerant without overcooling the cold insulation product is suppressed. Therefore, a cold-insulated packaging container is disclosed that can be kept cool for a long period of time and transported while preventing partial overcooling and partial lack of cooling of the cold-retained product. 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. It is formed of a multilayer sheet consisting of a metal inner layer and a heat insulating outer layer. Here, it is assumed that the temperature difference in the cold storage compartment is within 30 ° C, and the temperature change after 72 hours in the cold storage compartment is within 10 ° C.

[0007] Japanese Patent Laid-Open No. 2005-104567 discloses a multi-compartment in which one cold storage container is divided into two or more compartments having different cooling temperatures in order to store and store objects to be cooled having different cooling temperatures. A cold container is disclosed! It has a partition wall that separates the low-temperature and high-temperature compartments while increasing the thickness of any or all of the side wall, bottom surface, and lid of the container body in the low-temperature compartment of the multi-compartment cooler. Here, a plate or space for placing a refrigerant is provided in each section.

 Disclosure of the invention

 [0008] As described above, the temperature range for low-temperature circulation is broadly classified into two types, refrigeration and refrigeration, and the refrigeration and refrigeration and containers are usually used separately depending on the refrigerant used. It is. As the refrigerant, a cold storage material or dry ice is mainly used. In this case, if excessive cooling is performed, the product to be cooled may deteriorate in quality due to a low temperature failure, and if the cooling is insufficient, the quality may deteriorate due to an increase in temperature.

 [0009] In the delivery of refrigerated products, the use of cold storage materials is the mainstream. When using a regenerator material, it is necessary to pre-cool the regenerator material by freezing it at a temperature lower than the melting point of the regenerator material. When a regenerator material with a melting point lower than the target holding temperature is used, or when the precooling temperature is low, the temperature inside the regenerator is rapidly reduced immediately after the regenerator material is put into the regenerator. For this reason, some products may cause serious defects, such as low temperature damage. In addition, it was practically difficult to maintain a constant temperature for more than 12 hours using only the regenerator material.

[0010] On the other hand, when dry ice is used in the delivery of refrigerated goods, the sublimation temperature should be 78.5 ° C and V, and the characteristics of lies should not be frozen. It was hot. [0011] In addition, depending on the object, for example, in medicines and special fats, the temperature of the object being transported, the allowable temperature range, and the constant temperature holding time may be limited. Therefore, cold transport corresponding to this condition is required.

 [0012] In the method disclosed in Japanese Patent Application Laid-Open No. 2004-196410, according to the example, a polyethylene container having a plate thickness of 25 mm and an internal volume of 151 has a regenerator material with a melting point of -21 ° C of 0.8 kg. In a test using 0.5 kg of granular dry ice, the product temperature decreased to 38 ° C and rose to 15 ° C in 6 hours. Therefore, it can be used in the freezing area, but the test results in the refrigerated area have not been disclosed, and it seems difficult to keep the temperature constant in the refrigerated area.

 [0013] In the cold insulated packaging container disclosed in Japanese Patent Application Laid-Open No. 2003-160173, the temperature rise is described, but there is no specific description about keeping it cool for a long time at a predetermined temperature. Long-term constant temperature maintenance in the refrigerated region seems to be difficult.

 [0014] In the multi-compartment cold insulation container disclosed in Japanese Patent Application Laid-Open No. 2005-104567, there is no disclosure about performing cold insulation for a long time at a predetermined temperature.

 Accordingly, 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 over a long period of time within a predetermined cold temperature range.

 [0016] In order to achieve the object, a constant temperature and cold storage object stored in a containment container is stored. The constant temperature and cold box of the present invention is a box formed of a bottom wall and a side wall made of a material having heat insulation properties. A cold-insulated outer box, a lid made of a heat-insulating material, and detachably fitted into the upper opening of the cold-insulated outer box, and the interior of the cold-insulated outer box, the first space and the second And a partition wall that is separated into two spaces. The first space can store a storage container storing a constant temperature and cold storage object, and a cold storage refrigerant arranged around the storage container, and the second space stores dry ice. Is possible.

[0017] The partition wall may be provided with two partition walls separating the first space disposed in the center and the second spaces disposed on both sides of the first space. The partition wall may be removable. The walls can also be made of heat-insulating materials. The heat insulating material may be a foamed plastic, and the thickness of the heat insulating material may be set corresponding to the constant temperature and cold temperature of the constant temperature and cold object. The cold storage refrigerant is a cold storage material that solidifies at a predetermined solidification temperature and stores cold heat. It may be.

 [0018] The constant temperature and cold preservation method of the present invention uses the above-described constant temperature and cold box to cool a constant temperature and cold object stored in a storage container at a constant temperature over a predetermined time in a predetermined temperature range. This is a constant temperature cooling method. The constant temperature cooling method includes a step of storing a constant temperature cold storage object in a containment vessel having a heat insulating material force, and a precooled in which the solidification temperature is set in accordance with the constant temperature cold insulation temperature of the constant temperature cold storage object. A step of storing the refrigerant in the first space of the cold insulation outer box part, the step of storing the dry ice in the second space, and covering the cold insulation outer box part with a lid part and keeping the temperature constant. It includes the steps of completing the box and transporting and / or storing the completed constant temperature and cold box over a predetermined time.

 [0019] The temperature at which the constant temperature cold object is kept cold over a predetermined time is 5 ° C ± 3 ° C, the predetermined time for transportation and Z or storage is 30 hours, and the solidification temperature of the regenerator material May be 0 ° C.

[0020] The constant temperature cold box of the present invention includes a cold insulation 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 vessel made of a heat-insulating material, the containment vessel is surrounded by a cool storage material and stored in the first space, and dry ice is stored in the second space and transported. Yes! / Is stored. Since the object to be kept at a constant temperature 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 temperature of the cold storage material is the first. Even when the temperature is low, the temperature of the object to be kept at a constant temperature is prevented from changing rapidly, and by a gentle heat conduction with the cold storage material that is thawed at a predetermined solidification temperature, a predetermined temperature is maintained at a predetermined temperature. The temperature range is maintained. The cold storage material in the first space and the dry ice in the second space are in contact with the created partition wall as a cushioning material so that the temperature of the cold storage material does not drop rapidly. ,. Since the temperature rise in the second space is small, the dry ice also has little heat dissipation and sublimation is suppressed. The heat from the dry ice is stored as latent heat in the regenerator material and transmitted to the constant temperature object through the wall of the storage container. Since the object to be kept at a constant temperature also comes into contact with the cold storage material through the heat insulating wall of the containment vessel, the cold storage material is kept at a predetermined temperature by gradually thawing at the thawing temperature, while sublimating dry ice. Therefore, the cold heat entering through the partition wall is absorbed as latent heat by the cold storage agent. After the dry ice disappears due to sublimation of dry ice and the cooling capacity is lost, the cool 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.

 [0021] In addition, the constant temperature cold box can be manufactured by molding foamed plastic, so it is possible to remove the partition wall by using cool storage materials and dry ice that are low in cost in accordance with the cold storage conditions. Therefore, diversion to a normal cold box is also possible. Therefore, there is an effect that it is possible to reduce the constant temperature cooling cost as a whole.

 Brief Description of 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 shown in FIG.

 [Fig. 3] Fig. 3 is a schematic cross-sectional view of the constant temperature and cold retention bot- ter of Fig. 1 in which a constant temperature and cold preservation object, a cold storage material and dry ice are stored.

 [FIG. 4] FIG. 4 is a graph showing a temperature course of an experimental example of a constant temperature cold box.

 Explanation of symbols

 1 Constant temperature cold box

 11 Cooling outer box

 12 Lid

 13 Partition wall

 14 First space

 15 Second space

 21 Cold storage material

 22 Dry ice

 23 Support material

 31 Constant temperature and cold objects

 32 containment

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to the drawings. A constant temperature cold box 1 shown in FIGS. 1 to 3 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 12 is made of foamed plastic and is detachably aligned with the upper opening of the cold insulation outer box 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, a storage container 32 for the constant temperature and cold storage object 31 and a cool storage 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, the force of turning these materials as foamed plastics is not limited to this, and any material having a predetermined heat insulating property may be used. 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 provided when the cooling condition is not strict or the amount is small. V, even if the configuration is simply separated by a single partition wall 13. The partition wall 13 may be removable, and may be integrated with the cold insulation outer box portion 11, and a plurality of fitting portions may be provided in the cold insulation outer box portion 11 to provide the first space 14 and the second space 14. Let's be able to change the ratio of the size of space 15 in

 [0025] Next, a 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 based on the cold temperature of the constant temperature cold object 31. For example, when the temperature is + 5 ° C, the cold storage material 21 having a solidification temperature of 0 ° C is desirable. If the cold storage temperature is in the freezing zone, the cold storage material 21 with a solidification temperature lower than that temperature is selected. Next, the amount of heat released per hour is calculated from the surface area and outside air temperature of the constant temperature cold box 1 and the average internal temperature and average heat flow rate of the constant temperature cold box 1, and the cooling required to maintain the desired constant temperature holding time. The amount of heat is estimated. Based on the required amount of cooling heat, the required amount is calculated from the solidification latent heat of the regenerator 21 and the sublimation latent heat of the dry ice 22. In this case, the sublimation latent heat of the dry ice 22 is the main, and the cold storage material 21 has many elements as a cushioning material. Based on the calculated results, there are a first space 14 in which the containment vessel 32 for the constant temperature object 31 and the necessary heat storage material 21 can be stored, and a second space 15 in which the necessary dry ice 22 can be stored. A constant temperature cold box 1 with is selected.

[0026] First, the constant temperature cold object 31 is stored in the storage container 32 that also has a material force having heat insulation properties. It is. Next, the containment vessel 32 and the precooled regenerator material 21 whose solidification temperature is set in accordance with the constant temperature refrigerating temperature of the constant temperature object 31 are arranged so that the regenerator material 21 surrounds the periphery of the containment vessel 32. It is stored in the first space 14 of the cold insulation outer box portion 11 of the constant temperature cold insulation box 1. Further, 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 material 23, the cold storage material 21 is also arranged on the bottom surface side of the storage container 32, and the cold storage material 21 is arranged on the six surfaces of the storage container. It is desirable. The regenerator 21 can be a commercially available plate type. The dry ice 22 may be in the form of pellets. Wrap the plate-shaped dry ice 22 with paper and place it on the support 23 as shown in Figure 3.

[0027] 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 box 1 is completed. Next, packing is performed as necessary, and transportation and Z or storage is performed over a predetermined time under a predetermined external temperature condition. The constant temperature cold object 31 is maintained near the solidification temperature of the regenerator 21 by thawing the heat insulating wall of the containment vessel 32 and the regenerator 21. Since the thawed cold storage material 21 is solidified again by the heat of sublimation of the dry ice 22 across the partition wall 13, the constant temperature and 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 object 31 is maintained at a constant temperature until the latent heat accumulated in the cold storage material is consumed.

 [0028] Although it is difficult to keep at a constant temperature under refrigeration conditions near 0 ° C compared to refrigeration conditions, if a regenerator material 21 with a solidification temperature of 0 ° C is used, even if the ambient temperature is 30 ° C, the object is kept at constant temperature. It was possible to hold 31 at + 5 ° C for 3 hours at 3 ° C. If the wall having the heat insulating property of the constant temperature cold box 1 is increased and the cold storage material 21 is of a low-temperature solidification temperature type, the frozen product can be transported for a long time.

Next, an experimental example of the present embodiment will be described. Use 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 W = 725 mm, L = 425 mm, and H = 475 mm. The test was carried out for 50 hours at the target temperature of the cold object + 5 ° C ± 3 ° C. The cold storage materials used at this time were 10 pieces of 800g of Ade power top 1-8 (trade name) and 10.24kg of dry ice. Fig. 4 is a graph showing the temperature of the experimental example of the constant temperature cold box at that time. This In this case, the sample temperature was slightly lower, but it did not exceed 5 ° C. This average temperature can be adjusted by adjusting the amount of cold storage material input and the thickness of the partition wall. In addition, 3.52 kg of dry ice remained after 50 hours of testing, and the actual amount used was 6.72 kg.

Claims

The scope of the claims  [1] A constant temperature and cold box that stores a constant temperature and cold object to be stored in a containment vessel, and has a heat insulation property with a box-shaped cold outer box formed from a bottom wall and a side wall made of a heat insulating material. A lid portion that is removably fitted into the upper opening of the cold insulation outer box portion.  The inside of the cold insulation outer box portion is divided 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 cold box provided with a partition wall to be separated. [2] The constant temperature and cool box according to claim 1, wherein the heat insulating material is foamed plastic.  [3] The constant temperature cold box according to claim 1, wherein the thickness of the heat insulating material is set corresponding to a constant temperature cold temperature of the constant temperature cold object. [4] The constant temperature cold box according to claim 1, further comprising two partition walls that separate the first space arranged in the center and the second spaces arranged on both sides. [5] The constant temperature cold box according to claim 1, wherein the partition wall is removable. [6] The constant temperature cold box according to claim 1, wherein the partition wall also has a material force having heat insulation properties. [7] The constant temperature and cool box according to claim 6, wherein the heat insulating material is foamed plastic.  [8] The constant temperature cold 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. [9] Using a constant temperature cold box with the first space and the second space in the cold outer box, the constant temperature cold object to be stored in the containment vessel is kept in a predetermined temperature range for a predetermined time. A constant temperature cooling method for keeping the temperature constant.  A step of storing the object to be kept at a constant temperature in the containment vessel made of a material having heat insulation properties; The containment vessel is installed in such a way that the solidification temperature corresponds to the constant temperature and cold temperature of the constant temperature and cold object. A step of enclosing the surrounding area with a predetermined pre-cooled refrigerant for storage and storing in the first space;  Storing dry ice in the second space;  A step of covering the cold-insulated outer box with a lid, and completing the constant temperature cold box, and transporting and storing or storing the completed constant temperature cold box over a predetermined time. A constant temperature and cold insulation method using a constant temperature and cold box. The temperature at which the object to be kept at a constant temperature is kept cool over a predetermined time is 5 ° C ± 3 ° C, the predetermined time for transportation and Z or storage is 30 hours, and the solidification temperature of the regenerator material is 10. A constant temperature and cold insulation method using the constant temperature and cold preservation box according to claim 9, which is 0 ° C.