JP2004225942A - Low-temperature storage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-temperature storage capable of allowing the cold generated in a cryogenic mechanism to be efficiently conducted to an inner case of the low-temperature storage, and superior in its assembling performance. <P>SOLUTION: This low-temperature storage comprises a storage main body 4, the inner case 21 mounted in the storage main body 4, a sterling cycle engine 11 as a cooling mechanism thermally connected to the inner case 21, and a lid body 6 mounted on the storage main body 4. Foamed heat insulating members 23, 26, 36 and vacuum heat insulating members 24, 27, 37 as heat insulating members are mounted between an outer shell body of the storage min body 4 and the inner case 21, and in the lid body 6. A fixing part 25 is mounted for fixing a heat absorbing part 13 of the sterling cycle engine 11 in a state of being kept into contact with an outer face of the inner case 21, and the fixing part 25 is mounted to the outer face of the inner case 21. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a low-temperature storage that realizes a low-temperature state using an engine that generates cold heat by driving a piston.
[0002]
[Prior art]
As a low-temperature storage that realizes a low-temperature state by using an engine that generates cold heat by driving a piston, there is a low-temperature storage that uses a Stirling cycle engine. For example, there is a low-temperature storage that is described in Japanese Patent No. 3286494. . According to this publication, a Stirling cycle engine has a compression chamber formed in front of a compression cylinder section to compress working gas, and an expansion chamber formed in front of an expansion cylinder section to expand working gas, and the compression chamber The expansion chamber communicates with a gas flow path with a heat regenerator and a radiator interposed therebetween, and a reciprocating piston by a crank mechanism compresses or expands an operating gas to generate cold heat. It has been disclosed.
[0003]
In addition, as a storage container portion, a freezing compartment, which is a storage container portion, is formed by attaching a heat conductive plate to an inner wall of a heat insulating portion filled with a heat insulating material such as urethane between a box-shaped outer box and an inner box. Is disclosed.
[0004]
Further, the storage container of the low-temperature storage has a heat conducting portion connected to a tip of the expansion cylinder portion at a lower portion, the heat conduction portion is joined to a bottom surface of the heat conduction plate, and a portion having the expansion cylinder portion is made of a heat insulating material. It is also disclosed that it is covered.
[0005]
[Patent Document 1]
Japanese Patent No. 3286494 Patent Publication [0006]
[Problems to be solved by the invention]
However, according to the above-mentioned patent publication, since the expansion cylinder portion of the Stirling cycle engine is joined to the bottom surface of the heat conducting plate constituting the bottom surface of the inner container via the heat conducting portion, it has occurred in the Stirling cycle engine. There was a problem that the conduction of cold heat was indirect and it was difficult to efficiently transmit the heat to the inner container. Further, according to the above-mentioned patent publication, since the tip of the expansion cylinder portion of the Stirling cycle engine is merely joined to the bottom surface of the heat conduction plate, there is a risk that the two will not adhere or separate during assembly. There was a problem in assemblability.
[0007]
By the way, a Stirling cycle engine can be used as an engine that cools using a reciprocating motion of a piston as a cooling mechanism. In this case, in a Stirling cycle engine in which the expansion cylinder portion of the Stirling cycle engine and the bottom surface of the inner container are joined and the piston is reciprocated by the crank mechanism, the vibration due to operation is transmitted to the inner container, and heat due to the vibration is easily generated. There was a problem. However, for example, a Stirling cycle engine (corresponding to an expansion cylinder) comprising a displacer (corresponding to an expansion cylinder) which reciprocates in the axial direction by driving the piston reciprocally in an axial manner (corresponding to a compression cylinder) (Japanese Patent Laid-Open No. 2000-2000). If the heat absorbing portion of the Stirling cycle engine is fixed to the inner container by a fixing portion, the fixing is easy and the generation of heat due to the vibration is suppressed.
[0008]
Therefore, the present invention has been made to solve the above-described problem, and in a low-temperature storage using an engine that cools using a reciprocating motion of a piston, the cold generated in the heat absorbing portion of the engine is efficiently removed. An object of the present invention is to provide a low-temperature storage that can be transmitted to an inner container in the low-temperature storage and has excellent assemblability.
[0009]
[Means for Solving the Problems]
The invention of a low-temperature storage according to claim 1 includes a storage main body, an inner container provided in the storage main body, a cooling mechanism thermally connected to the inner container, and the storage main body. In a low-temperature storage having an attached lid, and a heat insulating member provided between the outer shell of the storage main body and the inner container and in the lid, a heat absorbing portion of the cooling mechanism is provided on an outer surface of the inner container. A fixing portion for fixing the inner container in contact with the inner container, and the fixing portion is attached to an outer surface of the inner container.
[0010]
According to the low temperature storage of claim 1, the heat absorbing portion of the cooling mechanism is provided with a fixing portion for abutting and fixing to the outer surface of the inner container of the storage main body, and the fixing portion is fixed to the outer surface of the inner container. Therefore, not only the cold generated in the heat absorbing portion is efficiently transmitted to the inner container, but also the fixing portion is attached to the inner container, so that the processing of the inner container and the fixing portion is easy.
[0011]
According to a second aspect of the present invention, in the first aspect, a contact surface is formed on the outer surface of the inner container so as to be in close contact with the end of the heat absorbing portion of the cooling mechanism, and the periphery of the contact surface is formed. The fixing part is attached so as to surround it.
[0012]
According to the low temperature storage of claim 2, the tip end of the heat absorbing portion of the cooling mechanism at which the temperature is lowest is in close thermal contact with the outer surface of the inner container, and the fixing portion surrounds the contact surface. So that the generated cold heat is efficiently transmitted to the inner container.
[0013]
According to a third aspect of the present invention, in the second aspect, the contact surface and the distal end surface of the cooling mechanism are in contact with each other, and the fixing portion fastens a side surface on the distal end side of the cooling mechanism. It is characterized by having been done.
[0014]
According to the low temperature storage of claim 3, since the fixing portion tightens the side surface on the tip side of the cooling mechanism, the deformation of the tip end surface is suppressed, so that the heat absorbing portion can be fixed with a simple structure and the occurrence of the heat absorbing portion has occurred. Transfers cold to the inner container efficiently.
[0015]
The invention of a low-temperature storage according to a fourth aspect is the invention according to any one of the first to third aspects, wherein the inner container and the fixing portion are made of the same material.
[0016]
According to the low temperature storage of claim 4, since the material of the fixing portion and the heat absorbing portion is the same, not only there is no heat conduction loss due to the difference in material, but also the inner container and the fixing portion are deformed with the same coefficient of thermal expansion.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0018]
FIG. 1 shows a low-temperature storage according to the present invention. This low-temperature storage 1 is for air-cooling a mounting room 2 in which a Stirling cycle engine 11 serving as a cooling mechanism is mounted, and a radiating fin 12 for discharging heat generated from the Stirling cycle engine 11 above the mounting room 2. A storage body 4 is provided above the outside air intake chamber 3 and the storage body 4 above the outside air intake chamber 3, and an object to be stored at a low temperature in a storage room 5 in the storage body above the storage body 4 is provided. There is provided a lid 6 for taking in and out. The storage body 4 and the lid 6 are attached to be freely opened and closed by a hinge or the like (not shown). In addition, a rubber roller 7 is provided below the mounting chamber 2 so that the low-temperature storage 1 can be moved.
[0019]
Inside the mounting room 2, there is a fixed base 14 having a vibration isolating mechanism 15 such as a spring for fixing the Stirling cycle engine 11. A substantially L-shaped fixing plate 16 is connected to the vibration isolating mechanism 15, and the fixing plate 16 is joined to the main body of the Stirling cycle engine 11 and fixed to the fixing stand 14. I have. The heat absorbing section 13 of the Stirling cycle engine 11 penetrates from the loading chamber 2 through the outside air intake chamber 3 to reach the storage main body 4, and the tip of the heat absorbing section 13 contacts the bottom of the inner container 21 in the storage. Are in contact with each other.
[0020]
The mounting chamber 2 and the outside air intake chamber 3 are partitioned by a partition plate 17, and a heat absorbing part 13 of the Stirling cycle engine 11 penetrates a central portion of the outside air intake chamber 3. Further, the radiation fins 12 are arranged so as to surround the radiation part 13 </ b> A below the heat absorption part 13. The outer shell of the outside air intake chamber 3 has an outside air intake hole (not shown). The outside air is taken in from the outside air intake hole, and the radiation fins 12 are air-cooled. Further, the radiation fin 12 is joined to the partition plate 17 by a radiation fin cover 18. The radiating fin cover 18 is formed of an elastic body such as rubber. In this portion, not only the transmission of the vibration of the Stirling cycle engine 11 to the outer shell of the low-temperature storage is reduced, but also By preventing the outside air taken in from the insertion hole from passing between the radiation fin 12 and the partition plate 17, the radiation efficiency of the radiation fin 12 is improved. Further, a heat insulating material 19 is formed and arranged with a smaller circumference than the heat radiation fins 12 so as to surround the space between the heat absorption part 13 and the heat radiation parts 13A above the heat radiation fins 12.
[0021]
In the central part of the storage main body 4, there is an inner container 21 (storage room 5) for storing items to be stored at a low temperature. A vibration isolating member 22 made of foamed rubber is arranged outside the inner container 21 so as to surround the inner container 21. Further, a foam heat insulating member 23 as a heat insulating member made of urethane foam is disposed so as to surround the vibration isolating member 22, and a vacuum heat insulating member 24 as a heat insulating member is disposed outside the foam heat insulating member 23. The vacuum heat insulating member 24 is disposed so as to cover not only the side surface but also the bottom surface of the foam heat insulating member 23. Further, the vibration isolating member 22 is arranged so that its lower end reaches the upper surface of the outside air intake chamber 3.
[0022]
On the bottom surface of the inner container 21, a contact surface 21A is formed at a central portion thereof, where the front end surface 13B of the heat absorbing portion 13 of the Stirling cycle engine 11 comes into contact. The heat absorbing portion 13 is fixed to the inner container 12 by a substantially C-shaped fixing portion 25 having an opening 51 in a part as shown in FIG. The fixing portion 25 is provided with a through-hole 52 on the side surface thereof. A bolt 53 is screwed into the through-hole 52 so that the side surface of the heat absorbing portion 13 of the Stirling cycle engine 11 is fastened and fixed. Has become. The fixing portion 25 is formed with four holes 54 for bolts 28 (described later) which do not penetrate from the upper surface to the lower surface, and the bolts 28 are screwed into the holes 54 so that the heat absorbing portions 13 are formed. The fixing portion 25, which is fastened to the tip side surface of the inner container, and the bottom surface of the inner container 21 are joined and fixed. The fixing portion 25 surrounds the contact surface 21A, and the contact surface 21A is thermally connected to the tip surface 13B of the heat absorbing portion 13. In good condition. The fixing portion 25 is fixed to the bottom surface of the inner container 21 in a thermally favorable state. By using the same material for the inner container 21 and the fixing portion 25, for example, aluminum or copper, not only the heat conduction loss due to the difference in heat conduction can be suppressed, but also the heat of the inner container 21 and the fixing portion 25 can be reduced. Since they have the same expansion coefficient, even if they are cooled by the heat absorbing portion 13, they are contracted in the same manner. It is not damaged or damaged. A foam insulation member 26 is disposed below the inner container 21 so as to cover the bottom surface of the inner container 21, and a vacuum insulation member 27 is provided on the bottom surface of the foam insulation member 26 so as to cover the lower portion. Are located. As shown in the enlarged portion of FIG. 1, a through hole for a bolt 28 is formed at the bottom of the inner container 21, and the bolt 28 is inserted into the through hole via an O-ring 29 for vibration isolation. By inserting and screwing into the hole 54, the fixing portion 25 to which the side surface of the distal end portion of the heat absorbing portion 13 is fastened and the inner container 21 are connected. Then, the distal end side surface of the heat absorbing portion 13 is fastened and fixed by the fixing portion 25 as described above, and the fixing portion 25 is formed so as to surround the contact surface 21A formed on the bottom surface of the inner container 21 and By fixing the distal end surface 13B of the heat absorbing portion 13 so as to contact the contact surface 21A in a thermally favorable state, the heat between the distal end surface 13B of the heat absorbing portion 13 and the contact surface 21A during assembly is secured. The assembly is easy to perform without impairing the close contact. In addition, since the distal end side surface of the heat absorbing portion 13 is tightened by the fixing portion 25, deformation of the distal end surface 13B of the heat absorbing portion 13 is suppressed, so that the distal end surface 13B of the heat absorbing portion 13 and the contact surface 21A It is further suppressed that the thermal adhesion to the film is impaired.
[0023]
The inner container 21 has an upper portion of the side wall extending to near the upper end of the storage main body 4. The upper part of the vibration isolating member 22 and the foamed heat insulating member 23 is covered with a mounting plate 30 made of synthetic resin. Further, an inner container connection packing 31 for the purpose of connecting the inner container 21 to the mounting plate 30 and isolating vibration is disposed between the lower surface of the mounting plate 30 and the upper end of the inner container 21. Further, on the outer peripheral side of the mounting plate 30, an outer shell of the storage main body 4 is formed so as to be folded into the storage room 5, and the folded portion of the outer shell is attached to the mounting plate 30. The outer periphery is covered. This part will be described using an enlarged part of FIG. The portion of the storage main body 4 folded inside the outer shell is partially sandwiched between the foam insulation member 23 and the mounting plate 30. A groove-shaped thin portion 35 is formed on the lower surface of the mounting plate 30 near the inner end of the folded portion of the outer shell of the storage body 4 so as to surround the inner container 21. The inner end of the folded portion of the outer shell of the storage body 4 is formed so as to be covered with the foamed heat insulating member 23. Since the mounting plate 30 made of a resin having a low thermal conductivity is thinned at the thin portion 35, heat conduction is further suppressed, and the inner shell 21 reaches the inner container 21 via the mounting plate 30 from the outer shell. Heat conduction is reduced.
[0024]
A foam heat insulating member 36 and a vacuum heat insulating member 37 are provided inside the lid 6, and an inner lid 38 is fixed to a lower surface of the lid 6. The foam insulation member 36 is provided on the storage chamber 5 side in the lid 6, and the vacuum insulation member 37 is provided outside the foam insulation member 36. The inner lid 38 is substantially the same as or smaller than the inner diameter of the inner container 21. Further, the outer shell of the lid 6 is also formed so as to be folded into the storage room 5 side similarly to the storage main body 4, and the inner end thereof has substantially the same structure as the mounting plate 30. It is covered with a mounting plate 39 made of synthetic resin. A thin portion 40 is also formed on the upper surface of the mounting plate 39 so as to surround the inner container 21. This part will be described using an enlarged part of FIG. The portion of the lid 6 folded inside the outer shell is sandwiched between the foam insulation member 38 and the mounting plate 39. A groove-shaped thin portion 40 is formed inside the inner end of the folded portion of the outer shell of the lid 6 on the upper surface of the mounting plate 39 so as to surround the inner container 21. I have. The mounting plate 39 made of a resin having a low thermal conductivity is made thinner at the thin portion 40, so that heat conduction is further suppressed, and the outer shell reaches the inner container 21 via the mounting plate 39. Heat conduction is reduced. Further, a lid packing 32 is fixed to the outer peripheral side of the mounting plate 39, and an inner lid packing 33 is mounted inside the lid packing 32. The lid packing 32 is a so-called magnet packing. By closing the lid 6, the lid packing 32 magnetically attaches to the outer shell of the storage main body 4, and the inner lid packing 33 comes into close contact with the mounting portion 30. Therefore, the storage chamber 5 of the storage main body 4 can be maintained in a substantially sealed state by the lid packing 33 and the inner lid packing 33. The outer shells of the housing main body 4 and the lid 6 preferably have low thermal conductivity and are made of a magnetic material. For example, a steel plate or the like can be used.
[0025]
With the above configuration, the piston (not shown) of the Stirling cycle engine 11, which is a cooling mechanism, reciprocates to cool the distal end of the heat absorbing section 13. The heat in the inner container 21 is transferred from the contact surface 21A of the inner container 21 to the distal end surface 13B of the heat absorbing portion 13 because the distal end surface 13B is in good thermal contact with the contact surface 21A. The fixing portion 25 that conducts and tightens the side surface of the distal end portion of the heat absorbing portion 13 is fixed to the bottom surface of the inner container 21 by the bolt 28 in a state of being in close contact with the bottom surface of the inner container 21, so that the inside of the inner container 21 is The heat is conducted from the fixing portion 25 to the distal end portion of the heat absorbing portion 13, so that the inner container 21 (storage chamber 5) is cooled.
[0026]
At this time, it was provided above the vacuum heat insulating member 24 provided outside the foam heat insulating member 23 provided outside the inner container 21 inside the storage housing body 4 and the foam heat insulating member 38 inside the lid 6. The vacuum heat insulating member 37 can effectively block heat flowing into the inner container 21 (storage room 5) from the outside of the low-temperature storage 1 and is provided below the inner container 21 in the storage main body 4. The vacuum heat insulating member 27 provided below the foam heat insulating member 26 can effectively block heat flowing from the heat radiating portion 13A of the Stirling cycle engine 11 into the inner container 21 (storage room 5). Further, since the mounting plate 30 provided on the upper portion of the storage main body 4 is formed of a synthetic resin, the inner container 21 (storage) is transmitted from the outer shell of the storage main body 4 via the mounting plate 30. In addition to suppressing the heat from flowing into the chamber 5), the formation of the groove-shaped thin portion 35 in the mounting plate 30 inhibits heat conduction in the thin portion 35, and the storage main body Heat from flowing into the inner container 21 (storage chamber 5) from the outer shell 4 is further suppressed. Similarly, also in the lid 6, since the mounting plate 39 is formed of a synthetic resin, heat flows from the outer shell of the lid 6 to the storage chamber 5 along the mounting plate 39. Not only is suppressed, but also the heat conduction in the thin portion 40 is hindered by the formation of the groove-shaped thin portion 40 in the mounting plate 39, and the outer shell of the lid 6 is transferred from the outer shell to the storage chamber 5. Inflow of heat is further suppressed. Therefore, the flow of heat into the inner container 21 (storage room 5) is effectively suppressed, and cooling is performed efficiently.
[0027]
By the way, the foam heat insulating members 23, 26, 36 are provided on the inner container 21 side of the vacuum heat insulating members 24, 27, 37. By blocking the cold heat, the outer surfaces of the vacuum heat insulating members 24, 27, and 37 do not become excessively low in temperature. For this reason, the film (usually a synthetic resin) on the outer surface constituting the vacuum heat insulating members 24, 27, 37 does not become low-temperature embrittlement, and the vacuum of these vacuum heat insulating members 24, 27, 37 is maintained. As a result, the low-temperature storage 1 maintains high heat insulation for a long period of time.
[0028]
The vibration generated in the Stirling cycle engine 11 and transmitted to the radiation fins 12 is absorbed by the radiation fin cover 18, so that the vibration is transmitted from the partition plate 17 to the outside air intake chamber 3, and further to the storage main body 4. Is prevented. On the other hand, since the heat absorbing portion 13 of the Stirling cycle engine 11 is in direct contact with the inner container 21, the vibration generated in the Stirling cycle engine 11 is transmitted to the inner container 21. However, since the outer surface of the inner container 21 is covered with the vibration isolating member 22, the vibration transmitted from the inner container 21 to the foam insulation member 23 is absorbed. That is, the foamed heat insulating member 23 is usually formed by injecting polyurethane into the outer shell of the storage main body 4 and foaming the foamed polyurethane foam. Since the polyurethane resin itself is relatively hard, vibration is easily transmitted along the outer surface of the foamed heat insulating member 23. However, as described above, the vibration is absorbed by the vibration isolating member 22. Vibration can be prevented from being transmitted to the storage main body 4 via 23. Further, since the inner container connection packing 31 is provided between the upper end of the inner container 21 and the mounting plate 30, the vibration transmitted from the inner container 21 to the mounting plate 30 is absorbed by the inner container connection packing 31. become. Furthermore, even if a slight vibration is transmitted from the side wall of the inner container 21 to the mounting plate 30, the vibration is transmitted to the outer shell of the storage body 4 by the groove-shaped thin portion 35 formed in the mounting plate 30. Is prevented. Therefore, the vibration transmitted from the Stirling cycle engine 11 to the inner container 21 is not transmitted to the storage main body 4.
[0029]
As described above, in the above embodiment, the storage main body 4, the inner container 21 provided in the storage main body 4, and the Stirling cycle as a cooling mechanism thermally connected to the inner container 21. An engine 11 and a lid 6 attached to the storage main body 4, and heat insulating members 23 and 36 are provided between the outer shell of the storage main body 6 and the inner container 21 and in the lid 6. In the low-temperature storage, a fixing portion 25 for fixing the heat absorbing portion 13 of the cooling mechanism in contact with the outer surface of the inner container 21 is provided, and the fixing portion 25 is fixed to the outer surface of the inner container 21. Since it is attached, not only can the cold generated in the heat absorbing portion 13 be efficiently transmitted to the inner container 21 to the inner container, but also the close contact between the heat absorbing portion 13 and the inner container 21 during assembly is not impaired. Assembly Cheap.
[0030]
A contact surface 21A is formed on the outer surface of the inner container 21 so as to be in close contact with the end surface 13B of the heat absorbing portion 13 of the Stirling cycle engine 11, and the fixing portion 25 is formed so as to surround the periphery of the contact surface 21A. Is attached, the thermal contact between the distal end surface 13B and the contact surface 21A is good, and the generated cold can be directly transmitted to the inner container 21. Cold heat can be more efficiently transmitted to the inner container 21 indirectly.
[0031]
Further, the contact surface 21A and the distal end surface 13B of the heat absorbing portion 13 of the Stirling cycle engine 11 are in contact with each other, and the fixed portion 25 is configured to tighten the side surface of the distal end portion of the heat absorbing portion 13. Not only can the heat absorbing portion 13 be easily fixed, but also the deformation of the front end surface 13B is suppressed, so that the front end surface 13B and the contact surface 21A are kept in close contact with each other, and the heat generated by the Stirling cycle engine 11 is removed by the inner container 21. More efficiently.
[0032]
Further, since the inner container 21 and the fixing portion 25 are made of the same material, there is no heat conduction loss due to a difference in the material, and the cold generated in the Stirling cycle engine 11 is efficiently transmitted to the inner container 21. Not only can the inner container 21 and the fixing portion 25 have the same coefficient of thermal expansion, but they contract in the same manner, so that the difference in the coefficient of thermal expansion between the inner container 21 and the fixing portion 25 causes a thermal expansion. There is no possibility that the adhesion is impaired or damaged due to stress. .
[0033]
Note that the present invention is not limited to the above embodiment, and various modifications can be made.
[0034]
【The invention's effect】
As described above, according to the first aspect of the present invention, the storage body, an inner container provided in the storage body, a cooling mechanism thermally connected to the inner container, A low temperature storage having a lid attached to the storage main body, wherein a heat insulating member is provided between the outer shell of the storage main body and the inner container and in the lid. A fixing portion for fixing the container in contact with the outer surface of the inner container is provided, and since the fixing portion is attached to the outer surface of the inner container, it is possible to efficiently transmit cold generated in the heat absorbing portion to the inner container. Thus, not only can the inside of the inner container be efficiently cooled, but also, since the fixing portion is attached to the inner container, the inner container and the fixing portion can be easily processed.
[0035]
According to the second aspect of the present invention, the coldest end of the heat absorbing portion of the cooling mechanism is in good thermal contact with the outer surface of the inner container, and the fixing portion surrounds the contact surface. In addition, the cold generated with good adhesion can be directly transmitted to the inner container, and can also be efficiently transmitted to the inner container indirectly via the fixing portion.
[0036]
The invention according to claim 3 is configured such that the contact surface and the distal end surface of the cooling mechanism are in contact with each other, and the fixing portion fastens the fixing portion to the side surface on the distal end side of the cooling mechanism, that is, the heat absorbing portion. Since the fixing portion tightens the side surface on the front end side of the cooling mechanism, deformation of the front end surface is suppressed, the heat absorbing portion can be fixed with a simple structure, and the generated cold heat is efficiently transmitted to the inner container. Can be.
[0037]
In the invention according to claim 4, since the inner container and the fixing portion are made of the same material, there is no heat conduction loss due to a difference in material, and the generated cold can be efficiently transmitted to the inner container. Not only that, the inner container and the fixed part are deformed with the same coefficient of thermal expansion, eliminating the possibility that the difference in the coefficient of thermal expansion between the inner container and the fixed part may cause thermal stress to be applied, resulting in loss of adhesion or damage. it can.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of the present invention.
FIG. 2 is a partially exploded perspective view showing a structure for fixing a heat absorbing portion of the Stirling cycle engine to a bottom surface of an inner container.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Low-temperature storage 4 Storage main body 6 Lid 11 Stirling cycle engine (cooling mechanism)
13 Heat absorbing portion 13B Tip surface 21 Inner container 21A Contact surface 23 Foamed heat insulating member (heat insulating member)
24 Vacuum insulation member (heat insulation member)
25 Fixing part 26 Foam insulation member (heat insulation member)
27 Vacuum insulation member (heat insulation member)
36 Foamed insulation member (heat insulation member)
37 Vacuum insulation member (heat insulation member)

Claims (4)

A storage unit having a storage unit, an inner container provided in the storage unit, a cooling mechanism thermally connected to the inner container, and a lid attached to the storage unit. In a low-temperature storage in which a heat insulating member is provided between an outer shell of a refrigerator main body and the inner container and in the lid, fixing is performed to fix a heat absorbing portion of the cooling mechanism in a state of contact with an outer surface of the inner container. A low-temperature storage box, wherein the fixing unit is provided on an outer surface of the inner container. A contact surface is formed on the outer surface of the inner container so as to be in close contact with the end of the heat absorbing portion of the cooling mechanism, and the fixing portion is attached so as to surround the periphery of the contact surface. Item 7. The low-temperature storage according to Item 1. 3. The low-temperature storage according to claim 2, wherein the contact surface is in contact with a distal end surface of the cooling mechanism, and the fixing portion is configured to clamp a side surface on a distal end side of the cooling mechanism. 4. 4. The low-temperature storage according to claim 1, wherein the inner container and the fixing portion are made of the same material.

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