JP2005308359A - Cooling storage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling storage comprising a machine chamber for mounting a stirling refrigerating machine capable of surely achieving heat-insulation between a low temperature part and a high temperature part of the stirling refrigerating machine with a simple structure without needing a large space, and preventing dew condensation. <P>SOLUTION: This cooling storage A has a cabinet 1 having a cooling chamber 11 (12) and the machine chamber 13, the stirling refrigerating machine 2 mounted in the machine chamber 13, and a secondary refrigerant circulating circuit 3 connected with the low temperature part 21 of the stirling refrigerating machine 2, and the low temperature part 2 and at least a condenser 31 of the secondary refrigerant circulating circuit 3 are mounted inside of a heat insulating layer 14 of the cabinet 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cooler that cools a cooling chamber by conveying cold heat generated in a low temperature part of a Stirling refrigerator to the cooling chamber.

  Recently, the reverse Stirling refrigeration cycle has attracted attention. The reverse Stirling refrigeration cycle employs a gas that does not adversely affect the global environment, such as helium gas, hydrogen gas, and nitrogen gas, as its working gas. A Stirling refrigerator using this reverse Stirling refrigeration cycle is known as one of small refrigerators that can generate a cryogenic cold.

  The Stirling refrigerator is disposed in a machine room of a refrigerator cabinet, and includes a high temperature part called a warm section and a low temperature part called a cold head. When a Stirling refrigerator is used as a cooling system apparatus for a refrigerator, the low temperature portion has a small surface area, and therefore it is important to efficiently transport it to a place (evaporator) that uses the cold heat of the low temperature portion.

  As a method for conveying the cold generated in the Stirling refrigerator to the evaporator, a secondary refrigerant circulation circuit for conveying the cold generated in the low temperature part to the evaporator is used.

  FIG. 8 shows a cross-sectional view of an example of a conventional refrigerator. The refrigerator C shown in FIG. 8 includes a cabinet 91, a Stirling refrigerator 92, a secondary refrigerant circulation circuit 93 that conveys the cold generated in the Stirling refrigerator 92 to the inside of the refrigerator, and the heat generated in the Stirling refrigerator 92. And a high temperature side refrigerant circulation circuit 94 for conveying the refrigerant to the outside of the refrigerator. The cabinet 91 includes a cooling chamber 911 that stores an object to be cooled, an evaporator storage chamber 912 that is disposed adjacent to the cooling chamber 911, and a machine chamber 913 in which a Stirling refrigerator 92 is disposed.

  The Stirling refrigerator 92 includes a low temperature part 921 that generates cold heat and a high temperature part 922 that generates warm heat. A secondary refrigerant circulation circuit 93 that conveys cold heat is connected to the low temperature portion 921, and a high temperature side refrigerant circulation circuit 94 that conveys warm heat is connected to the high temperature portion 922. The Stirling refrigerator 92 is installed in the machine room 913 via a vibration isolation member 95.

  In the secondary refrigerant circulation circuit 93, a condenser 931 attached to the low temperature part 921 of the Stirling refrigerator 92 and an evaporator 932 in the evaporator housing chamber 912 are connected by a refrigerant pipe 933. The secondary refrigerant circulation circuit 93 in which the secondary refrigerant is sealed is a thermosiphon type natural circulation circuit using the phase change of the secondary refrigerant.

  The secondary refrigerant in the natural circulation circuit secondary refrigerant circulation circuit 93 is cooled and liquefied by the condenser 931 in contact with the low temperature portion 921 of the Stirling refrigerator 92 and flows down through the refrigerant pipe 933 and flows into the evaporator 932. To do. The liquid secondary refrigerant that has flowed into the evaporator 932 undergoes heat exchange when it passes through the evaporator 932 and changes into steam.

  The secondary refrigerant that has become the vapor is sucked up due to a phenomenon in which the vapor rises, a pressure difference that occurs when the vapor changes to a liquid phase, and when the liquid secondary refrigerant flows down, and flows into the condenser 931. By repeating the above phase change and flow of the secondary refrigerant, the cold heat in the low temperature part can be continuously transferred to the evaporator 932 in the evaporator housing chamber 912. This natural circulation circuit uses natural circulation by a thermosyphon, and an apparatus for forcibly circulating a refrigerant such as a circulation pump is unnecessary, and energy saving can be achieved accordingly.

  Similarly to the secondary refrigerant circulation circuit 93, the high temperature side refrigerant circulation circuit 94 includes an evaporator 941, a condenser 942, and a refrigerant pipe 943. The evaporator 941 is attached to the high temperature part 922 of the Stirling refrigerator 92, and the condenser 942 is arranged on the upper part of the evaporator 941. The evaporator 941, the condenser 942, and the refrigerant pipe 943 constitute a loop thermosyphon. The high temperature side natural circulation circuit 94 is filled with a refrigerant (here, water).

In the evaporator 941, the heat generated in the high temperature part 922 is transmitted to the refrigerant. Then, the refrigerant that has absorbed the heat evaporates into vapor and is conveyed to the condenser 942 through the refrigerant pipe 943, and the heat of the refrigerant is radiated to the atmosphere by the condenser 941. Thereafter, the cooled and cooled refrigerant is liquefied and circulated to the evaporator 941 through the refrigerant pipe 943. By repeating the above operation, the high temperature side natural circulation circuit 94 releases the heat generated in the high temperature part 922 of the Stirling refrigerator 92 to the outside of the Stirling cooler C.
JP 2002-235963 A

  As shown in FIG. 8, the free piston type Stirling refrigerator 92 has a structure in which the low temperature portion 921 and the high temperature portion 922 are arranged close to each other, and the low temperature portion 921 is heated by the heat generated from the high temperature portion 922. As a result, the temperature rises and the cooling capacity of the Stirling refrigerator 92 decreases. Therefore, in order to prevent the cooling capacity of the Stirling refrigerator 92 from being lowered, a method of covering the low temperature part 921 with a heat insulating member 923 as shown in FIG. If the low temperature portion 921 is covered with the heat insulating member 923, the influence of the heat generated from the high temperature portion 922 can be prevented.

  However, if a structure covered with a heat insulating member having a sufficient heat insulating effect is adopted, the parts cost of the heat insulating member and the assembly cost for covering the heat insulating member are required, and the space occupied by the heat insulating member is required, which reduces the degree of design freedom. There is a risk that the effective internal volume of the refrigerator will be small.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a refrigerator that has a simple structure, can reduce manufacturing costs, can have a large effective internal volume, and can sufficiently insulate a low-temperature part of a Stirling refrigerator. To do.

  The present invention relates to a cabinet having a cooling chamber for accommodating an object to be cooled, a machine chamber partitioned by the cooling chamber and a heat insulating wall, a Stirling refrigerator disposed in the machine chamber, and the Stirling refrigerator A secondary refrigerant circulation circuit that is connected to the low temperature portion and conveys cold heat generated in the low temperature portion to the evaporator, and exchanges heat with the low temperature portion and the secondary refrigerant circulation circuit. The condenser which comprises is insulated with the heat insulation layer which comprises the said cabinet, It is characterized by the above-mentioned.

  According to this configuration, by insulating the low-temperature part of the Stirling refrigerator and the condenser with a heat-insulating layer that constitutes the cabinet, a heat insulating member that insulates the low-temperature part and the condenser is separately provided, The structure is simple, the degree of freedom of design is increased, and the capacity of the refrigerator corresponding to the space occupied by the heat insulating member can be increased.

  More specifically, the low temperature part and the condenser are embedded in a heat insulating layer of the cabinet formed by integrally foaming a foamable heat insulating material.

  According to this configuration, the low temperature part and the condenser are embedded in a heat insulating layer of a cabinet formed by integrally foaming a foamable heat insulating material, thereby improving the heat exchange efficiency between the low temperature part and the condenser. To do. Further, since the heat insulating layer is in close contact with the low temperature part and the condenser, it is possible to increase the internal volume of the refrigerator as much as unnecessary space is not required, and it is possible to solve the problem that ice is formed in the unnecessary space.

  On the other hand, in the structure in which the low temperature part and the condenser are thermally insulated through an air layer, a seal member having a vibration absorbing property is attached to a portion through which the Stirling refrigerator passes.

  According to this configuration, it is possible to prevent vibration due to driving of the Stirling refrigerator from propagating to the cabinet through the heat insulating layer.

  And the heating means is installed in the part which the said Stirling refrigerator penetrates the heat insulation layer of the said cabinet, or its vicinity.

  According to this structure, it can prevent that the part which the said Stirling refrigerator penetrates the heat insulation layer of the said cabinet dew.

  The heating means is a heat exchanger for exchanging heat with the high temperature part of the Stirling refrigerator.

  According to this configuration, since the dew generation is prevented by using the heat of the high temperature portion of the Stirling refrigerator, energy saving can be achieved as compared with the use of the electric heater.

  According to the present invention, the structure is simple and the degree of freedom of design is increased compared to a case where a low-temperature part and a heat insulating member for insulating the condenser are separately provided, and the capacity of the refrigerator corresponding to the space occupied by the heat insulating member can be increased. Can be planned.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a refrigerator according to the present invention, FIG. 2 is a side sectional view of the refrigerator shown in FIG. 1, and FIG. 3 is a horizontal sectional view of the refrigerator shown in FIG. In the cross-sectional views shown in FIGS. 2 and 3, the door of the refrigerator is omitted. As shown in FIGS. 1 and 2, the refrigerator A includes a cabinet 1, a Stirling refrigerator 2, a secondary refrigerant circulation circuit 3, and a high temperature side refrigerant circulation circuit 4.

  The cabinet 1 has a first cooling chamber 11, a second cooling chamber 12, and a machine chamber 13 in which the Stirling refrigerator 2 is disposed. The first cooling chamber 11 is disposed above the second cooling chamber 12, and the cooling set temperature of the first cooling chamber 11 is higher than the cooling set temperature of the second cooling chamber 12. The wall surface 111 of the first cooling chamber 11 and the wall surface 121 of the second cooling chamber 12 are formed so as to have a high heat insulation capability in order to prevent the cold heat from escaping to the outside. The boundary between the first cooling chamber 11 and the second cooling chamber 12 is also partitioned by a heat insulating wall 14 having high heat insulating properties and a detachable partition wall 15. In addition, a communication hole 151 is provided in a part of the partition wall 15 so that the air inside the first cooling chamber 11 and the second cooling chamber 12 can flow with each other (see FIG. 3).

  An isolation wall 16 having high heat insulating properties is provided between the first cooling chamber 11 and the second cooling chamber 12 and the machine chamber 13, and the first cooling chamber 11 and the second cooling chamber are provided. 12 cold heat is prevented from escaping through the wall surface to the machine room 13. In addition, an evaporator accommodating chamber 17 in which an evaporator 32 of a secondary refrigerant circulation circuit 3 described later is disposed on the back side of the second cooling chamber 12.

  The Stirling refrigerator 2 has a low temperature part 21 that generates cold and a high temperature part 22 that generates warm heat. A secondary refrigerant circulation circuit 3 that conveys cold heat is connected to the low temperature portion 21, and a high temperature side refrigerant circulation circuit 4 that conveys warm heat is connected to the high temperature portion 22. The Stirling refrigerator 2 is installed in the machine room 13 via a vibration isolation member 131.

  As shown in FIGS. 1 and 2, the secondary refrigerant circulation circuit 3 includes a condenser 31, an evaporator 32, and a refrigerant pipe 33. The evaporator 32 is disposed below the condenser 31. The secondary refrigerant circulation circuit 3 forms a thermosiphon by connecting a condenser 31 and an evaporator 32 with a refrigerant pipe 33 and enclosing a secondary refrigerant therein. The condenser 31 is disposed in contact with the low temperature part 21, and is a tube wound around the low temperature part 21 here, although not limited thereto. The evaporator 32 is disposed in an evaporator housing chamber 17 provided adjacent to the second cooling chamber 12. Although not limited to this, the evaporator 32 has a meandering evaporation pipe 321 and a heat exchange fin 322 arranged in contact with the evaporation pipe 321. By attaching the heat exchange fins 322, the area for heat exchange can be increased, and the heat exchange capability can be increased accordingly.

  The evaporator housing chamber 17 communicates with the second cooling chamber 12. An air circulation fan (not shown) is attached to the evaporator housing chamber 17, and cool air cooled by the evaporator 32 is sent to the second cooling chamber 12, and heat exchange is performed in the second cooling chamber 12. By doing so, the air inside the second cooling chamber 12 is cooled.

  In the secondary refrigerant circulation circuit 3, the secondary refrigerant is cooled and condensed by the cold heat generated in the low temperature portion 21 of the Stirling refrigerator 2 in the condenser 31, and changes into a liquid phase. The secondary refrigerant that has changed to a liquid flows down the refrigerant pipe 33 and flows into the evaporator 32. The secondary refrigerant evaporates by exchanging heat with the air inside the evaporator housing chamber 17 in the evaporator 32 and cools by removing the heat of vaporization from the air inside the evaporator housing chamber 17. The evaporated secondary refrigerant rises in the refrigerant pipe and flows into the condenser 31 due to a phenomenon in which high-temperature vapor rises and a pressure difference when the phase changes from liquid to gas and when the liquid secondary refrigerant flows down. . By repeating this, the secondary refrigerant can circulate in the secondary refrigerant circuit 3.

  As shown in FIGS. 1 and 3, the low temperature portion 21 of the Stirling refrigerator 2, the condenser 31 of the secondary refrigerant circulation circuit 3 disposed in contact with the low temperature portion 21, and a part of the refrigerant pipe 33 connected to the condenser 31 are It is embedded inside the heat insulating wall 14 of the refrigerator A. Further, portions other than the low temperature portion 21 of the Stirling refrigerator 2 are disposed inside the machine room 13.

  From this, since the low temperature part 21 of the Stirling refrigerator 2 is covered with the heat insulating layer of the heat insulating wall 14 having a high heat insulating capacity, sufficient heat insulation is performed and the influence of the heat generated from the high temperature part 22 is prevented. In addition, it is possible to prevent dew formation. Moreover, since the low temperature part 21 and the condenser 31 are embed | buried inside the heat insulation wall 14, it is not necessary to provide the heat insulation member for heat-insulating only the low temperature part 21 like the prior art example shown in FIG. Accordingly, the number of components of the refrigerator can be reduced, the manufacturing cost can be reduced, and the cooling space of the first cooling chamber 11 and / or the second cooling chamber 12 can be widened.

  Although it is not limited to it as a heat insulation layer of the heat insulation wall 14, a foaming heat insulating material (For example, foaming urethane etc.) can be mentioned. By using a foaming heat insulating material, a part of or all of the low temperature part 21, the condenser 31 and the refrigerant pipe 33 are assembled and foamed in a state of being installed inside the refrigerator A, and the low temperature part 21, the condenser 31. In addition, a part of the refrigerant pipe 33 can be embedded in the heat insulating wall 14. Moreover, although the heat insulation layer of the heat insulation wall 14 is illustrated as a heat insulation layer which embeds a part of the low temperature part 21, the condenser 31, and the refrigerant | coolant piping 33, it is not limited to it, The wall surface and isolation wall of the cabinet 1 Those having a heat insulating layer that can sufficiently insulate between the low temperature portion 21 and the high temperature portion 22 such as 16 heat insulating layers can be widely used.

  The secondary refrigerant circulates while changing phase in the condenser 31 and the evaporator 32 and conveys the cold generated in the low temperature part 21, whereby the air in the evaporator housing chamber 17 can be cooled. The second cooling chamber 12 can be cooled by circulating the cooled air inside the evaporator housing chamber 17 between the evaporator housing chamber 17 and the second cooling chamber 12. A part of the cooled air flows through the communication hole 151 and circulates in the first cooling chamber 11, whereby the first cooling chamber 11 can be cooled. The cold air cooled by the evaporator is heated by exchanging heat in the second cooling chamber 12, and the heated cold air rises and flows into the first cooling chamber 11 through the communication hole 151, and The cooling chamber 11 is cooled to a temperature higher than that of the second cooling chamber 12.

  The high temperature side refrigerant circulation circuit 4 has the same configuration as the secondary refrigerant circulation circuit 3. That is, it has a high temperature side evaporator 41, a high temperature side condenser 42 and a high temperature side refrigerant pipe 43. The high temperature side evaporator 41 is disposed in contact with the high temperature portion 22 of the Stirling refrigerator 2. In addition, the high-temperature side condenser 42 is not limited thereto, but is disposed in the heat radiating chamber 18 provided on the back surface of the first cooling chamber 11 here. The heat radiating chamber 18 is formed so that air outside the refrigerator A flows in.

  As shown in FIG. 2, the high temperature side evaporator 41 is disposed below the high temperature side condenser 42. A high-temperature side evaporator 41 and a high-temperature side condenser 42 are connected by a high-temperature side refrigerant pipe 43 to enclose the refrigerant, thereby forming a natural circulation type thermosiphon.

  In the high temperature side refrigerant circulation circuit 4, the refrigerant absorbs the heat generated in the high temperature portion 22 of the Stirling refrigerator 2 in the high temperature side evaporator 41, and is heated to evaporate. The evaporated refrigerant rises in the high temperature side refrigerant pipe 43 and flows into the high temperature side condenser 42. The refrigerant that has flowed into the high temperature side condenser 42 is cooled by exchanging heat with the air outside the refrigerator A and condensed into a liquid. The liquid refrigerant flows down the high temperature side refrigerant pipe 43 and flows into the high temperature side evaporator 41. By repeating this, the high-temperature side refrigerant circulation circuit 4 can circulate the refrigerant inside and release the heat generated in the high-temperature part 22 of the Stirling refrigerator 2 to the outside of the refrigerator A.

  FIG. 4 shows a sectional view of another example of the refrigerator according to the present invention, and FIG. 5 shows a horizontal sectional view of the refrigerator shown in FIG. The cooler B shown in FIGS. 4 and 5 is the same as the cooler A shown in FIG. 1 except that the machine room 13b, the heat insulating wall 14b, the evaporator accommodating room 17b, the first cooling room 11b, and the second cooling room 12b are different. The substantially same parts are denoted by the same reference numerals.

  The refrigerator B shown in FIGS. 4 and 5 conveys the cold generated in the low temperature part 21 of the Stirling refrigerator 2 to the second cooling chamber 12b in the secondary refrigerant circulation circuit 3, and the high temperature of the Stirling refrigerator 2 is high. The heat generated in the section 22 is discharged to the outside of the refrigerator B using the high-temperature side refrigerant circulation circuit 4.

  The heat insulating wall 14b of the refrigerator B shown in FIGS. 4 and 5 has a space 141b inside. The space 141b and the machine room 13b are separated by a partition wall 142b which is a part of the heat insulating wall 14b. A through hole 143b is formed in the partition wall 142b. The Stirling refrigerator 2 is arranged in the machine room 13b. The low temperature part 21 is arranged in the space 141b with the partition wall 143b interposed therebetween, and the high temperature part 22 is arranged in the machine room 13b.

  As described above, the partition wall 142b forms a part of the heat insulating wall 14b, and the low temperature part 21 and the high temperature part 22 arranged with the partition wall 142b interposed therebetween are sufficiently insulated from each other. It is possible to prevent dew generation by sufficiently insulating the low temperature part 21 and the high temperature part 22. Moreover, since it can prevent that the cold heat which generate | occur | produces in the low temperature part 21 is warmed by the warm heat which generate | occur | produces in the high temperature part 22, the 1st cooling chamber 11b and / or the 2nd cooling chamber of the refrigerator B are only that much. It can prevent that the cooling capacity which cools 12b falls.

  FIG. 6 shows an enlarged cross-sectional view of the partition wall of the refrigerator shown in FIG. In the case where a gap 144b is formed between the through hole 143b provided in the partition wall 142b and the Stirling refrigerator 2 as in the partition wall 142b shown in FIG. 6, a seal member 145b is disposed in the gap 144b and the space 141b and the machine The chamber 13b is hermetically separated. The seal member 145b has high heat insulating properties. By disposing the seal member 145b in the gap 144b, it is possible to prevent the air cooled in the low temperature part 21 from flowing into the machine chamber 13b. Moreover, since the sealing member 145b has high heat insulation properties and the cooled air is prevented from flowing into the machine chamber 13b, dew generation can be prevented.

  The seal member 145b may have heat insulation and vibration absorption. The vibration at the time of driving of the Stirling refrigerator 2 can be absorbed by the vibration absorbing property of the seal member 145b. Thereby, it is possible to reduce the vibration of the Stirling refrigerator 2 from propagating to the cabinet 1b of the refrigerator B, and it is possible to reduce the occurrence of problems such as noise and fatigue failure due to vibration.

  As shown in FIG. 7, when a sufficient thickness for preventing the partition wall thickness t from being dewed cannot be secured, in other words, when the partition wall 146b does not have sufficient heat insulation capability, the partition wall 146b has a through hole 147b portion. A heater 148b for preventing dew condensation may be provided. The heater 148b is provided in the through hole 147b, but is not limited to this, and a place where the effect of preventing dew condensation can be obtained in the vicinity of the through hole 147b can be widely used. Further, the heater 148b may be attached to the portion 24 passing through the partition wall 146b of the Stirling refrigerator 2 and / or the vicinity thereof instead of the partition wall 146b.

  An example of the heater 148b is an electric heater using electricity as a heat source. Further, the present invention is not limited to this, and a material that can be heated to such an extent that the partition wall 146b is not dewed can be widely used. The heat of the high temperature part 22 of the Stirling refrigerator 2 may be conveyed and a partition may be heated with the heat.

  In the above-described embodiment, the first cooling chamber 11 (or 11b) and the cooling chamber A (or B) having the second cooling chamber 12 (or 12b) have been described as examples. Instead, the same structure can be adopted for one or two or more cooling chambers. Further, although the arrangement direction of the Stirling refrigerator is the horizontal direction in the above example, it is not limited thereto, and an arrangement direction that does not interfere with the operation of the Stirling refrigerator and does not interfere with the cooling chamber can be widely adopted.

  Moreover, although each above-mentioned Example has illustrated what embeds the low temperature part of a Stirling refrigerator inside the heat insulation wall which divides | segments a 1st cooling chamber and a 2nd cooling chamber, It is limited to it Instead, it is possible to widely employ a heat insulating layer disposed in the refrigerator that can prevent the cold heat in the low temperature part from escaping.

It is sectional drawing of an example of the refrigerator concerning this invention. It is a sectional side view of the refrigerator shown in FIG. It is a horizontal sectional view of the refrigerator shown in FIG. It is sectional drawing of the other example of the refrigerator concerning this invention. It is a horizontal sectional view of the refrigerator shown in FIG. It is an expanded sectional view of the through-hole shown in FIG. It is a horizontal sectional view of the further another example of the refrigerator concerning the present invention. It is sectional drawing of an example of the conventional refrigerator.

Explanation of symbols

1 cabinet 11, 11b first cooling chamber 12, 12b second cooling chamber 13, 13b machine chamber 14, 14b heat insulation wall 141b space 142b partition wall 143b through hole 144b gap 145b seal member 146b partition wall 147b through hole 148b heater 15 partition wall 16 Separation wall 17 Evaporator housing chamber 18 Radiation chamber 2 Stirling refrigerator 21 Low temperature section 22 High temperature section 3 Secondary refrigerant circulation circuit 31 Condenser 32 Evaporator 33 Refrigerant piping 4 High temperature side refrigerant circulation circuit 41 High temperature side evaporator 42 High temperature side Condenser 44 High-temperature side refrigerant piping A, B

Claims (5)

A cabinet having a cooling chamber for accommodating an object to be cooled, and a machine room partitioned by the cooling chamber and a heat insulating wall;
A Stirling refrigerator disposed in the machine room;
A secondary refrigerant circulation circuit that is connected to a low temperature part of the Stirling refrigerator and conveys cold heat generated in the low temperature part to an evaporator;
The refrigerator characterized by heat-insulating the said low-temperature part and the condenser which heat-exchanges with this low-temperature part, and comprises the said secondary refrigerant circulation circuit with the heat insulation layer which comprises the said cabinet.   The refrigerator according to claim 1, wherein the low-temperature part and the condenser are embedded in a heat insulating layer of the cabinet formed by integrally foaming a foamable heat insulating material.   What insulates the low-temperature part and the condenser through an air layer, wherein the Stirling refrigerator has a vibration-absorbing seal member attached to a portion through the heat-insulating layer of the cabinet, The refrigerator according to claim 1.   The refrigerator according to any one of claims 1 to 3, wherein a heating means is installed in a portion where the Stirling refrigerator passes through or in the vicinity of the heat insulating layer of the cabinet.   The refrigerator according to claim 4, wherein the heating means is a heat exchanger that exchanges heat with a high-temperature part of the Stirling refrigerator.

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