JPH0658657A - Thermoelectric conversion type constant temperature storage - Google Patents

Abstract

(57) [Summary] [Purpose] Suitable for refrigerating chemicals that are unstable to light and heat, such as photoresist, and can control the temperature inside the chamber with high accuracy and completely shut off the inside from the outside. As a result, a thermoelectric conversion type constant temperature storage cabinet that can prevent light and outside air from entering is disclosed. [Structure] A wall surrounding a rectangular article storage space 3 of a storage is constituted by heat transfer walls composed of heat-conductive thick plates 7a to 7d made of aluminum or the like so that heat can be mutually transferred. The heat absorbing surface of the thermoelectric conversion element 10 is closely attached to one surface of the wall, and the water cooling type radiator 11 is attached to the heat radiation surface of the thermoelectric conversion element.
In the thermoelectric conversion type constant temperature storage, characterized in that the outer surface of the heat transfer wall excluding the radiator is covered with the heat insulating material 9, since the heat transfer wall surrounds and cools the article storage space,
Since the cooling efficiency is high and the plate has a large heat capacity, it is not affected by the heat entering from the outside and the storage temperature is highly accurate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a storage using a thermoelectric conversion element (Peltier element), and in particular, it requires accurate temperature control such as storage of chemicals lacking thermal stability. The present invention relates to a storage device suitable for storing articles.

[0002]

2. Description of the Related Art Conventionally, as a device of this type, as shown in FIGS. 5 and 6, a refrigerating chamber 50 for freely opening and closing by a drawer door 52 and a refrigerator attached integrally to the refrigerating chamber 50. Inner case 51 that is equipped with 55 and forms the inner wall surface of the refrigerator compartment
It is known that the refrigerant evaporation pipe 58 of the refrigerator is closely attached to the outside of the above, is wound and mounted, and the outside is covered with a heat insulating material 53.

Although this device has a large cooling power, the compressor 5
6. Since it requires a certain space such as the condenser 57,
There are limits to the miniaturization of the device itself, and
The compressor 56 of the refrigerator serves as a source of noise, vibration, and dust, and causes the indoor environment, particularly the cleanliness thereof, to be impaired. In terms of manufacturing, the inner case 5 made of a metal plate or the like is used.
When disposing the pre-bent refrigerant vaporization pipe 58 on the outer surface of 1, the vaporization pipe 58 is attached to the inner case 51 with a metal adhesive tape 54 having good heat conduction in order to enhance cooling efficiency.
Since it is tightly fixed to the outer surface of the inner surface and then covered with a heat insulating material, it takes time and effort to dispose the pipe body, and the evaporation tube protrudes on the inner case surface so that there is unevenness. In the case of coating with, the step of forming a foamed polyurethane resin or the like by directly foaming it on the surface of the inner case is indispensable, and there is a drawback that the production is troublesome.

A refrigerator using a thermoelectric conversion element is known as a refrigerator without such drawbacks. This is because, for example, as shown in FIG.
And a heat insulation door 61, and a through opening 6 on the side surface of the heat insulation wall.
3, the thermoelectric conversion element 66 is sandwiched in between, and the heat absorbing surface thereof is fitted with a cooling heat exchanger 68, and the heat radiation surface thereof is fitted with an electronic refrigerator provided with a radiator 70. It has been known. (See Japanese Utility Model Laid-Open No. 63-147685). This refrigerator has a heat exchanger 68 for cooling, an article storage space 60
The air circulation fan 69 agitates the air in the refrigerator to improve the cooling efficiency and uniform the temperature inside the refrigerator. A duct 73 surrounds the air-cooled radiator, and is provided with an air inlet 72 and an exhaust fan 71.

Even if this device is equipped with an air circulation fan, the temperature inside the store is not stable due to the heat entering the store through the heat insulating material. Especially, this is because the storage place is appropriate. Not only when there is the influence of radiant heat from the window side, etc. Further, since the electronic refrigerator is provided so as to penetrate the heat insulating wall 62, the opening / closing operation of the door 61 and the object to be covered must be completed unless the gap between the peripheral portion of the through opening 63 and the electronic refrigerator is completely sealed. When the temperature rises below the set temperature, such as after cooling items have been put into the refrigerator, the inside temperature is gradually cooled, and the temperature inside the refrigerator decreases accordingly. There is a risk that However, in case of a failure or the like, the electronic refrigerator needs to have a structure that can be freely attached to and detached from the opening 63. Therefore, it is difficult to perfect the sealing structure in this portion, and therefore the article storage space 60 is not provided outside. There is a drawback that the structure for shutting off from is difficult.

[0006]

It is an object of the present invention to control the temperature inside a refrigerator with high accuracy, which is suitable for refrigerating a chemical which is unstable to light and heat such as a photoresist, and to keep the inside of the refrigerator completely outside. It is an object of the present invention to disclose a thermoelectric conversion type constant temperature storage that can be shielded to prevent the entry of light and the outside air.

[0007]

According to a first aspect of the present invention, a part or the whole of a wall surrounding an article storage space of a storage cabinet is constituted by a heat transfer wall having a large heat capacity and made of a material having good heat conductivity. A heat exchanger is installed on the other surface of the thermoelectric conversion element, and a heat exchanger is provided on the other surface of the thermoelectric conversion element. It is a thermoelectric conversion type constant temperature storage characterized by being coated with.

A second gist of the present invention is to provide at least three or more walls surrounding a rectangular article storage space of a storage cabinet,
The three or more walls are constituted by heat transfer walls made of a heat-conductive thick plate so that heat can be mutually conducted, and one of the heat transfer walls is closely contacted with one of the heat absorption and heat dissipation surfaces of the thermoelectric conversion element. A thermoelectric conversion type constant temperature storage characterized in that a heat exchanger is provided on the other heat absorbing and radiating surface of the thermoelectric conversion element, and the outer surface of the heat transfer wall excluding the heat exchanger is covered with a heat insulating material. It is in the warehouse. Less than,
The present invention will be described in detail based on examples.

[0009]

1 to 3 show an embodiment of the present invention. The following description exemplifies the case where the article is used as a refrigerator for storing the article at a temperature lower than room temperature to avoid complication, but excluding the application for keeping the article warm at room temperature or higher. Of course not.
A storage 1 having a door 2 that can be opened and closed on the front side has a rectangular storage space 3 for storing chemicals such as photoresist, together with the door 2 having corrosion resistance and heat conductivity such as a stainless steel thin plate. It is surrounded by an inner case 4 made of a transparent material, and except for the peripheral edge of the opening that closes the door 2, the storage space 3
Are enclosed in a gas- and liquid-tight closed state.

On the outer surface of the inner case 4, welding bolts 5, 5, ... Are erected at a plurality of positions at right angles to the surface. On the outside of the inner case 4, five heat transfer plates 7a to 7e made of a thick aluminum plate are provided in close contact with each other, and a heat transfer wall that surrounds the five faces of the box-shaped storage space 3 excluding the opening is provided. Are configured. Each heat transfer plate has a bolt hole 8 corresponding to the position of the welding bolts 5, ... In the bolt hole 8, a step shape is formed in the vicinity of the outer surface of the heat transfer plate. Is provided with a nut chamber 8a having an enlarged diameter, and the length of the bolt 5 is set to be smaller than the thickness of the heat transfer plate, and the nut 5a is tightened,
Even if the heat transfer plates 7a to 7e and the inner case are tightly fixed to each other, the bolts and nuts do not project to the outer surfaces of the heat transfer plates 7a to 7e.

Further, the abutting portions of the peripheral portions of the heat transfer plates are firmly and closely fixed to each other by screw bolts 6, 6, .... In a suitable place on the outer surface of such a box-shaped heat transfer wall, preferably in the vicinity of the center of the outer surface of the heat transfer plate 7d equidistant from each heat transfer plate, the thermoelectric conversion element 10 is in a state where its heat absorption surface is in close contact. The heat-dissipating surface of the element 10 is attached to the heat-conductive block body 12 made of the same material as the heat-transfer plate, and the liquid flow path is formed in a meandering shape. A heat exchanger as a radiator 11 formed by connecting the water conduits 13, 13 is closely provided so as to exchange heat. Then, except for the radiator 11, the surface of the heat transfer wall is covered with a heat insulating material 9 such as polyurethane foam. As described above, since the heat transfer wall has no protrusions such as bolts, the heat transfer wall is sufficiently adhered to the heat transfer wall with a plate-shaped heat insulating material.
No foam molding step is required.

In the above embodiment, the heat transfer wall made of a material having good heat conductivity is made to butt against a thick metal plate made of aluminum, copper or the like with its end faces smoothed and fixed by screws, bolts or the like.
As shown in FIG. 4, this is closely fixed, but it is made of a lightweight casting alloy such as an aluminum alloy or a copper alloy, which is lightweight, and has a five-sided shape except for the door opening 21. 22a to 22e are formed as seamless one-piece castings, and the inner surface is coated with a chemical resistant film according to the characteristics of the casting alloy, for example, by anodizing the aluminum alloy casting. By doing so, the number of manufacturing steps can be greatly reduced. Further, as a heat exchanger, a large number of heat radiation fins 24 are integrally formed on the block body 23 having good heat conduction so that the cross-sectional shape is comb-shaped.
It may be of a type in which this is surrounded by a duct (not shown) and forcedly cooled.

[0013]

[Effect] In the conventional thermoelectric conversion type constant temperature storage, the cooling fins attached to the heat absorbing surface of the thermoelectric conversion element so as to be able to exchange heat are directly stored in the article storage space, and circulating air by a blower fan is applied to this. Although it had a structure to cool the inside of the storage, the storage of the present application has the entire wall surface surrounding the article storage space composed of heat transfer walls, and one surface of this heat transfer wall is cooled by a thermoelectric conversion element to The cooling effect is exerted by the heat conduction effect on the entire wall surface surrounding the article storage space, so that the inside of the refrigerator can be uniformly cooled by being wrapped by the cooling surface. Therefore, a fan for stirring the air in the storage is not always necessary depending on the usage of the storage, but by providing a fan, the uniformity of temperature distribution inside the storage and the cooling effect are further improved. To do.

Further, since it is not necessary to expose the cooling fins in the article storage space, an opening for penetrating the electronic refrigerator in the wall surface is not required when mounting the refrigerator, and the refrigerator and the periphery of the opening are hermetically sealed. There is no troublesome work such as securing the structure,
Insulation processing, assembly, production of a structure that shields the article storage space from the outside, etc. are easy, and the cost reduction effect is high. Furthermore, since the thick heat transfer wall with a large heat capacity has a high heat storage effect, it prevents heat from entering the refrigerator through the wall surface,
The fluctuation of the internal temperature is extremely small. In addition, even if the cooling capacity fluctuates due to a power failure or a refrigerator failure, the heat transfer wall minimizes changes in the internal temperature for a certain period of time, and unexpected changes in the quality of stored items. It is possible to prevent a situation such as causing the above. Further, even if the refrigerator is detached in case of failure or maintenance of the refrigerator, the effect on the temperature inside the refrigerator can be made smaller than that of the conventional case. The effect in the case of reversing the direction of the current flowing through the thermoelectric conversion element to heat the article storage space to keep it warm is also in accordance with the above.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional explanatory view showing a fixing structure of a heat transfer plate and an inner case in the embodiment of FIG.

FIG. 3 is an explanatory view showing a combined state of the heat transfer wall and the electronic refrigerator of the embodiment of FIG.

FIG. 4 is a partial cross-sectional explanatory view showing a main part of another embodiment of the present invention with a heat insulating material coating removed.

FIG. 5 is an explanatory diagram showing a main part of an example of a conventional technique.

FIG. 6 is an explanatory diagram showing an overall configuration of the conventional technique shown in FIG.

FIG. 7 is an explanatory diagram showing another example of the conventional technique.

[Explanation of symbols]

 2 door 3 article storage space 4 inner case 5 welding bolt 6 screw bolt 7a to e heat transfer plate 9 heat insulating material 10 thermoelectric conversion element 11 water-cooled radiator

Claims (4)

[Claims] 1. A part or the whole of a wall surrounding an article storage space of a storage cabinet is constituted by a heat transfer wall having a large heat capacity made of a material having good thermal conductivity, and a thermoelectric conversion element is provided at an appropriate position on an outer surface of the heat transfer wall. One of the thermoelectric conversion elements is closely attached and a heat exchanger is provided on the other heat absorbing and radiating surface of the thermoelectric conversion element, and the other part of the heat transfer wall is covered with a heat insulating material. Conversion type constant temperature storage. 2. A heat transfer wall comprising at least three or more walls surrounding a rectangular article storage space of a storage cabinet, and a heat-conductive thick plate in a state in which the three or more walls can conduct heat to each other. And a heat exchanger is provided on one surface of the heat transfer wall so that one of the heat absorbing and radiating surfaces of the thermoelectric conversion element is closely attached and the other heat absorbing and radiating surface of the thermoelectric conversion element is provided with a heat exchanger. A thermoelectric conversion type constant temperature storage characterized in that the outer surface of the heat transfer wall except for is covered with a heat insulating material. 3. A wall surrounding an article storage space is constituted by a heat transfer wall formed by abutting and fixing a plurality of heat-conductive thick plates in the vicinity of their ends, and closely contacting the inner surface of the heat transfer wall. The heat transfer is achieved by inserting bolts shorter than the thickness of the thick plate erected at a plurality of positions on the outer surface of the inner case, which are provided upright, into bolt holes formed in the heat transfer wall and tightening the nuts. The thermoelectric conversion type constant temperature storage cabinet according to claim 2, wherein the wall and the inner case are closely fixed so that heat can be transferred. 4. A heat transfer wall surrounding an article storage space has a seamless integral structure formed by casting a heat conductive metal, and the inner surface of the heat transfer wall is covered with a corrosion resistant coating. The thermoelectric conversion type constant temperature storage according to claim 1 or 2.