JP2006226654A - Stirling cooler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an energy-saving Stirling cooler. <P>SOLUTION: The Stirling cooler 1 is provided with a cooler body 1A, a Stirling refrigerating machine 4 provided in the cooler body 1A, and fans 8 and 12C provided in a cooler body 1A interior or a periphery of the cooler 1A to generate air currents. The fan 8 is provided in a downstream side of the air current generated by the fan 12C and hugging a cooler body 1A shell wall so as to generate an air current in parallel with the air current. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a Stirling Refrigerator / Freezer, and more particularly, to a Stirling refrigerator having a plurality of fans.

  As what applied the heat exchange by a reverse Stirling cycle to a refrigerator, what was described in Unexamined-Japanese-Patent No. 2004-20056 (conventional example 1) or Unexamined-Japanese-Patent No. 2004-101050 (conventional example 2) is mentioned, for example. It is done.

In the prior art 1, it is a refrigerator which cools the inside by a Stirling refrigeration engine, and the first high temperature side refrigerant circulation circuit for releasing the heat of the high temperature part formed in the Stirling refrigeration engine to the outside of the warehouse, There is disclosed a refrigerator having a second high-temperature side refrigerant circulation circuit that uses heat for at least one of promoting drain evaporation, preventing condensation on a refrigerator wall, and defrosting a heat exchanger for cooling in the refrigerator. . Also in Conventional Example 2, a similar refrigerator is disclosed.
Japanese Patent Laid-Open No. 2004-20056 JP 2004-101050 A

  However, the above-described refrigerator has the following problems.

  In the above-described refrigerator, a plurality of fans are installed for the purpose of promoting the evaporation of drain water and cooling the radiator. In a system in which a plurality of fans are used, the airflow generated by each fan becomes resistance to each other, and as a result, the operating efficiency of the refrigerator may decrease.

  In the refrigerators according to the conventional examples 1 and 2, although a plurality of fans are provided, the plurality of fans are installed in series, and the airflow along the airflow generated by the upstream fan is generated. The idea that the downstream fan is generated is not disclosed in the conventional examples 1 and 2.

  This invention is made | formed in view of the above problems, and the objective of this invention is providing the Stirling cooler by which energy saving was achieved.

  The Stirling cooler according to the present invention includes a cooler main body, a Stirling engine provided in the cooler main body, and first and second fans that are provided inside or around the cooler main body and generate airflow. The second fan is provided so as to generate an airflow along the flow of the airflow on the downstream side of the airflow flowing along the outer shell wall of the cooler main body generated by the first fan.

  According to the above configuration, a synergistic effect between the first and second fans can be obtained and power consumption can be reduced.

  Here, the Stirling engine has a high temperature part and a low temperature part, and the Stirling cooler is provided in the vicinity of a radiator as a cooling means for the high temperature part of the Stirling engine and the cooler main body, and drains from the cooler main body. It is preferable to further include a drain pan for storing water, the first fan is provided in the vicinity of the drain pan, and the second fan is provided in the vicinity of the radiator.

  Here, it is preferable that the drain pan is provided in the vicinity of the bottom surface of the refrigerator main body, and the Stirling engine is provided on the back side of the refrigerator main body and above the drain pan. It is more preferable to provide an airflow passage from the drain pan to the high temperature portion of the Stirling engine, and to install the first and second fans in the passage. Here, the “airflow passage” may be provided by attaching a duct to the refrigerator main body, or may be formed in the vicinity of the back of the main body by installing the refrigerator main body in front of the wall. There may be.

  According to the said structure, the airflow which passed the drain pan vicinity which stores drain water can be guide | induced to the heat radiator vicinity using a natural phenomenon. Moreover, since humid air with high humidity has a higher heat transport potential than dry air, the heat dissipation efficiency of the radiator can be improved.

  The drain pan has a first drain pan into which drain water from the refrigerator main body flows, a second drain pan connected to the first drain pan, and a communication path for leading drain water overflowing from the first drain pan to the second drain pan. The first fan is installed in the vicinity of the first drain pan.

  By installing the first fan in the vicinity of the first drain pan where the drain water is preferentially guided, the humid air can be supplied to the vicinity of the radiator of the Stirling engine while promoting the evaporation of the drain water at a higher rate. .

  The first fan preferably generates an air flow toward the surface of the drain water stored in the drain pan.

  According to this structure, evaporation of drain water can be accelerated | stimulated using a collision jet.

  According to the present invention, the operational efficiency (operation efficiency) of the Stirling refrigerator can be improved.

  In the following, one embodiment of a Stirling refrigerator according to the present invention will be described.

  In the present specification, the “cooling box” is a concept including all of “refrigerator”, “freezer”, and “freezer refrigerator”.

  In this embodiment, a Stirling refrigerator as a Stirling engine and a Stirling refrigerator as a Stirling engine-equipped device equipped with the Stirling refrigerator will be described. The Stirling engine is originally limited to a Stirling refrigerator. For example, it is used as a generator.

  FIG. 1 is a piping system diagram of a Stirling cooler according to one embodiment of the present invention.

  As shown in FIG. 1, the Stirling refrigerator 1 includes a Stirling refrigerator 4 (Stirling engine) having a high temperature part 2 and a low temperature part 3, a high temperature side evaporator 5 attached to the high temperature part 2, and a high temperature side condenser. 7 and the first high temperature side circulation circuit (first circulation circuit) including the pipes 2A and 2B, and the second high temperature side circulation circuit including the high temperature side evaporator 5, the circulation pump 6, the dew prevention pipe 9 and the pipes 2C to 2E ( 2nd circulation circuit) and the low temperature side circulation circuit containing the low temperature side condenser 10 attached to the low temperature part 3, the low temperature side evaporator 11, and the pipes 3A and 3B. The first high temperature side circulation circuit cools the high temperature part 2 of the Stirling refrigerator 4, and the second high temperature side circulation circuit supplies heat to the dew condensation prevention pipe 9. The low temperature side circulation circuit performs heat exchange between the air in the refrigerator and the low temperature part 3 of the Stirling refrigerator 4.

Water (H ₂ O) or the like is sealed as a refrigerant in the first and second high temperature side circulation circuits. The refrigerant evaporated in the high temperature side evaporator 5 reaches the high temperature side condenser 7 via the pipe 2A (high temperature side conduit) (broken line arrow in FIG. 1). The refrigerant is condensed by heat exchange with the outside air in the high temperature side condenser 7. In order to promote this heat exchange, a fan 8 that generates an air flow in the vicinity of the high-temperature side condenser 7 is provided. The condensed refrigerant returns to the high temperature side evaporator 5 through the pipe 2B (high temperature side return pipe). In the first high temperature side circulation circuit, the heat generated in the high temperature part 2 can be transferred to the high temperature side condenser 7 by utilizing the natural circulation caused by the evaporation and condensation of the refrigerant. The side condenser 7 is disposed above the high temperature side evaporator 5. In order to adjust the boiling point of the refrigerant, the pressure in the circulation circuit system is adjusted (substantially reduced in vacuum).

  On the other hand, a pipe 2 </ b> C is connected to the lower part of the high temperature side evaporator 5. Liquid phase refrigerant flows from the high temperature side evaporator 5 into the pipe 2C. The refrigerant flowing into the pipe 2 </ b> C reaches the circulation pump 6 provided below the Stirling refrigerator 4. The refrigerant discharged from the circulation pump 6 is sent to the dew prevention pipe 9 via the pipe 2D. Here, the refrigerant flowing in the dew condensation prevention pipe 9 is kept at a relatively high temperature by the heat given from the high temperature part 2 of the Stirling refrigerator 4. Therefore, the dew condensation prevention pipe 9 can be arranged in the front opening of the refrigerator to suppress the dew condensation at the door portion or the like. The refrigerant that has flowed through the dew condensation prevention pipe 9 returns to the high temperature side evaporator 5 through the pipe 2E. Thus, forced circulation by the circulation pump 6 is performed in the second high temperature side circulation circuit.

  Carbon dioxide, hydrocarbons, and the like are sealed as refrigerant in the low temperature side circulation circuit. The refrigerant condensed in the low temperature side condenser 10 reaches the low temperature side evaporator 11 through the pipe 3A (low temperature side conduit). Heat exchange is performed by evaporating the refrigerant in the low temperature side evaporator 11. In order to promote this heat exchange, a fan 12 that generates an air flow in the vicinity of the low-temperature evaporator 11 is provided. After the heat exchange, the gasified refrigerant returns to the low temperature side condenser 10 through the pipe 3B (low temperature side return pipe). In the low-temperature side circulation circuit, the low-temperature side evaporator 11 is thus condensed at the low-temperature side so that the cold heat generated in the low-temperature part 3 can be transmitted using the natural circulation caused by the evaporation and condensation of the refrigerant. It is arranged below the vessel 10. Further, the pressure in the circulation circuit system is adjusted in order to adjust the boiling point of the refrigerant.

  When the Stirling refrigerator 4 is operated, heat generated in the high temperature part 2 of the refrigerator 4 is exchanged with air through the high temperature side condenser 7. On the other hand, the cold generated in the low temperature part 3 of the Stirling refrigerator 4 is heat exchanged with the air in the refrigerator through the low temperature side evaporator 11. The warmed airflow from the inside of the refrigerator is sent again to the vicinity of the low-temperature side evaporator 11 and repeatedly cooled.

  Along with the implementation of the cooling cycle described above, frost is formed in the refrigerator (for example, around the low-temperature evaporator 11). On the other hand, defrosting is performed by appropriately adjusting the flow of the refrigerant. About this defrost method, since a generally well-known technique can be used, detailed description is not performed.

  By performing the defrosting described above, defrosted water is generated. The defrost water is guided to the drain pan 12B (evaporating dish) installed at the lower part of the bottom surface of the refrigerator main body through the drain pipe 12A. A fan 12C is provided in the vicinity of the drain pan 12B, and an air flow is formed near the surface of the defrost water accumulated in the drain pan 12B by the fan 12C, and relatively dry air is supplied onto the defrost water. , Evaporation of defrost water is promoted.

  Next, an example of the structure of the Stirling refrigerator 4 and its operation will be described with reference to FIG.

  As shown in FIG. 2, the Stirling refrigerator 4 of the present embodiment is a free piston type Stirling engine, and includes a casing 30, a cylinder 13 assembled to the casing 30, and a reciprocating motion in the cylinder 13. Piston 14 and displacer 15, regenerator 16, working space 17 including a compression space 17 </ b> A and an expansion space 17 </ b> B, a high temperature portion 2, a low temperature portion 3, a linear motor 23 as a piston driving means, and a piston spring 24, a displacer spring 25, a displacer rod 26, and a back pressure space 27.

  In the example of FIG. 2, the outer shell (outer wall) of the Stirling refrigerator 4 is not constituted by a single container, but is positioned on the back pressure space 27 side and the casing 30 (vessel portion) and on the working space 17 side. The high-temperature part 2, the tube 18A, and the low-temperature part 3 are mainly configured. The casing 30 defines a back pressure space 27. Various parts including the cylinder 13, the linear motor 23, the piston spring 24, and the displacer spring 25 are assembled to the casing 30. The outer shell is filled with a working medium such as helium gas, hydrogen gas, or nitrogen gas.

  The cylinder 13 has a substantially cylindrical shape, and receives therein a piston 14 and a displacer 15 as a free piston so as to be capable of reciprocating. In the cylinder 13, the piston 14 and the displacer 15 are coaxially spaced apart, and the piston 14 and the displacer 15 divide the working space 17 in the cylinder 13 into a compression space 17 </ b> A and an expansion space 17 </ b> B. More specifically, the working space 17 is a space located closer to the displacer 15 than the end face of the piston 14 on the displacer 15 side, and a compression space 17A is formed between the piston 14 and the displacer 15, and the displacer 15 and the low temperature portion 3, an expansion space 17 </ b> B is formed. The compression space 17A is mainly surrounded by the high temperature part 2, and the expansion space 17B is mainly surrounded by the low temperature part 3.

  Between the compression space 17A and the expansion space 17B, a regenerator 16 in which a film is wound with a predetermined gap on the inner peripheral surface of the tube 18A is disposed. The compression space 17A and the expansion space 17B communicate with each other. Thereby, a closed circuit is formed in the Stirling refrigerator 4. The working medium sealed in the closed circuit flows in accordance with the operations of the piston 14 and the displacer 15, thereby realizing a reverse Stirling cycle described later.

  A linear motor 23 is disposed in the back pressure space 27 located outside the cylinder 13. The linear motor 23 includes an inner yoke 20, a movable magnet portion 21, and an outer yoke 22, and the piston 14 is driven in the axial direction of the cylinder 13 by the linear motor 23.

  One end of the piston 14 is connected to a piston spring 24 constituted by a leaf spring or the like. The piston spring 24 functions as an elastic force applying means for applying an elastic force to the piston 14. By applying an elastic force to the piston spring 24, the piston 14 can be reciprocated in the cylinder 13 more stably and periodically. One end of the displacer 15 is connected to a displacer spring 25 via a displacer rod 26. The displacer rod 26 is disposed through the piston 14, and the displacer spring 25 is constituted by a leaf spring or the like. The peripheral edge of the displacer spring 25 and the peripheral edge of the piston spring 24 are supported by a support member that extends from the linear motor 23 toward the back pressure space 27 of the piston 14 (hereinafter sometimes referred to as the rear).

A back pressure space 27 surrounded by a casing 30 is disposed on the opposite side of the piston 14 from the displacer 15. The back pressure space 27 includes an outer peripheral region located around the piston 14 in the casing 30 and a rear region located closer to the piston spring 24 (rear side) than the piston 14 in the casing 30. There is also a working medium in the back pressure space 27.

  The high temperature part 2 is attached to the casing 30 via the base member 30A. The high temperature part 2 and the low temperature part 3 are connected via the tube 18A. On the inner peripheral surfaces of the high temperature part 2 and the low temperature part 3, an internal heat exchanger 18 and an internal heat exchanger 19 are provided, respectively. The internal heat exchangers 18 and 19 perform heat exchange between the compression space 17A and the expansion space 17B and the high temperature part 2 and the low temperature part 3, respectively.

  A balance mass 29 is attached to the rear side of the casing 30 via a leaf spring 28. The balance mass 29 is a mass member that absorbs vibration of the casing 30 that is generated when the piston 14 and the displacer 15 vibrate. Specifically, when the vibration is generated in the casing 30 due to the vibration of the piston 14 or the displacer 15, the balance mass 29 is vibrated so as to follow the vibration of the casing 30, whereby the Stirling refrigerator 4. Vibration is reduced.

  For example, a first distance sensor is provided on the end face of the piston 14 on the displacer 15 side, and a second distance sensor is provided on the end face of the displacer 15 on the low temperature part 3 side. The first distance sensor can measure a change with time of the interval between the piston 14 and the displacer 15 during the operation of the Stirling refrigerator 4. Further, the second distance sensor can measure a change over time in the interval between the displacer 15 and the low temperature part 3 when the Stirling refrigerator 4 is operated.

  Next, the operation of the Stirling refrigerator 4 will be described.

  First, the linear motor 23 is actuated to drive the piston 14. The piston 14 driven by the linear motor 23 approaches the displacer 15 and compresses the working medium (working gas) in the compression space 17A.

  When the piston 14 approaches the displacer 15, the temperature of the working medium in the compression space 17 </ b> A rises, but heat generated in the compression space 17 </ b> A by the high temperature portion 2 is released to the outside. Therefore, the temperature of the working medium in the compression space 17A is maintained almost isothermal. That is, this process corresponds to an isothermal compression process in a reverse Stirling cycle.

  After the piston 14 approaches the displacer 15, the displacer 15 moves to the low temperature part 3 side. On the other hand, the working medium compressed in the compression space 17A by the piston 14 flows into the regenerator 16, and further flows into the expansion space 17B. At that time, the heat of the working medium is stored in the regenerator 16. That is, this process corresponds to an isovolumetric cooling process in a reverse Stirling cycle.

  The high-pressure working medium that has flowed into the expansion space 17B expands when the displacer 15 moves to the piston 14 side (rear side). As the displacer 15 moves rearward in this way, the center portion of the displacer spring 25 is also deformed so as to protrude rearward.

  When the working medium expands in the expansion space 17B as described above, the temperature of the working medium in the expansion space 17B decreases, but external heat is transferred into the expansion space 17B by the low temperature portion 3, The inside of the expansion space 17B is kept almost isothermal. That is, this process corresponds to an isothermal expansion process of a reverse Stirling cycle.

  Thereafter, the displacer 15 starts to move away from the piston 14 (front side). Thereby, the working medium in the expansion space 17B passes through the regenerator 16 and returns to the compression space 17A side again. At this time, since the heat stored in the regenerator 16 is applied to the working medium, the working medium is heated. That is, this process corresponds to a constant volume heating process of a reverse Stirling cycle.

  By repeating this series of processes (isothermal compression process-isovolume cooling process-isothermal expansion process-isovolume heating process), an inverse Stirling cycle is configured. As a result, the low temperature part 3 is gradually lowered in temperature and has an extremely low temperature (for example, about −50 ° C.). On the other hand, the high temperature part 2 becomes gradually high temperature (for example, about 60 ° C.). As described above, the cold heat in the low temperature section 3 is supplied into the refrigerator through the low temperature side circulation circuit, and the heat in the high temperature section 2 is released to the outside of the refrigerator through the first and second high temperature side circulation circuits. Is done.

  As described above, the Stirling refrigerator 1 includes a plurality of fans (fans 8, 12, 12C, etc.) inside or around the refrigerator main body. Therefore, it is important from the viewpoint of improving the operation efficiency of the Stirling refrigerator 1 to suppress the airflows generated by these fans from becoming resistance to each other.

  FIG. 3 is a view showing the arrangement of a plurality of fans in the Stirling refrigerator 1. In the example shown in FIG. 3, the refrigerator main body 1 </ b> A is installed in front of the wall 32. The Stirling refrigerator 4 is provided in a machine room 31 provided on the refrigerator main body rear surface 1B side. The drain pan 12B is provided in the vicinity of the bottom surface 1C of the refrigerator main body.

  The airflow (broken arrows in FIG. 3) generated by the fans 8 and 12C flows from the bottom surface 1C of the cooler body to the back surface 1B of the cooler body. An airflow passage 40 is formed in the vicinity of the cooler main body back surface 1B. A guide duct 33 is provided in the upper part of the cooler main body rear surface 1B. The airflow that has flowed on the cooler main body back surface 1 </ b> B is divided into two directions by the guide duct 33. One of the divided flows flows out upward of the cooler main body 1A, and the other is guided to the vicinity of the ion generator 34 attached to the upper portion of the cooler main body 1A. Thereby, cooling of the ion generator 34 is performed.

  The fan 12C and the fan 8 are arranged in series along the airflow direction. That is, the fan 8 is provided so as to generate an air flow along the flow of the air flow on the downstream side of the air flow generated by the fan 12C. Thereby, the synergy effect of the fans 8 and 12C is obtained, and the power consumption is reduced.

  As shown in FIG. 3, by providing the Stirling refrigerator 4 above the drain pan 12B, the airflow that has passed through the vicinity of the drain pan 12B for storing drain water is guided to the vicinity of the high-temperature side condenser 7 by utilizing a natural phenomenon. be able to. Since humid air with high humidity has a higher heat transport potential than dry air, the heat dissipation efficiency in the vicinity of the high-temperature side condenser 7 is enhanced.

  FIG. 4 is a view showing an example of the arrangement of the drain pan 12 </ b> B in the Stirling refrigerator 1.

  In the example shown in FIG. 4, the drain pan 12 </ b> B is divided into a main drain pan 35 and a sub-drain pan 36. The drain water from the cooling body 1 </ b> A first flows into the main drain pan 35. The drain water overflowing from the main drain pan 35 is guided to the sub drain pan 36 through the overflow pipe 37. The fan 12 </ b> C is installed between the main drain pan 35 and the sub drain pan 36 and in the vicinity of the main drain pan 35. A partition 38 is provided between the main drain pan 35 and the sub drain pan 36.

  The fan 12C generates an air flow at the bottom of the bottom surface 1C of the refrigerator main body. The airflow is directed from the front surface of the refrigerator main body onto the sub-drain pan 36 and then toward the water surface of the drain water stored in the main drain pan 35. And it goes to the refrigerator main body back side through the opening part 39. FIG.

  As described above, by installing the fan 12C in the vicinity of the main drain pan 35 where the drain water is preferentially guided, the evaporation of the drain water can be promoted at a higher rate. Further, by causing the air flow by the fan 12C to face the water surface of the drain water stored in the main drain pan 35, evaporation of the drain water can be promoted using the collision jet.

  FIG. 5 is a view showing another example of the arrangement of the drain pan 12 </ b> B in the Stirling refrigerator 1. FIG. 6 is a view showing a VI-VI cross section in FIG.

  Also in the examples shown in FIGS. 5 and 6, the drain pan 12 </ b> B is divided into a main drain pan 35 and a sub-drain pan 36, and the main drain pan 35 and the sub-drain pan 36 are connected via an overflow pipe 37. For example, a sirocco fan is used as the fan 12C. The fan 12 </ b> C is provided in the vicinity of the drain pan 35 so as to generate an air flow toward the main drain pan 35.

  The above contents are summarized as follows.

  The Stirling cooler 1 according to the present embodiment includes a cooler main body 1A, a Stirling refrigerator 4 (Stirling engine) provided in the cooler main body 1A, and the inside of the cooler main body 1A or around the cooler main body 1A. Fans 12C, 8 (first and second fans) that are provided and generate airflow are provided, and the fan 8 (second fan) is provided on the outer shell wall of the refrigerator main body 1A generated by the fan 12C (first fan). It is provided on the downstream side of the airflow flowing along the airflow so as to generate an airflow along the flow of the airflow.

  The Stirling refrigerator 4 has a high temperature part 2 and a low temperature part 3, and the Stirling refrigerator 1 includes a high temperature side condenser 7 (radiator) as a cooling means for the high temperature part 2 of the Stirling refrigerator 4, and a refrigerator main body 1A. A drain pan 12B for storing drain water from the cooling body 1A, a fan 12C is provided in the vicinity of the drain pan 12B, and a fan 8 is provided in the vicinity of the high temperature side condenser 7. .

  The drain pan 12B is provided in the vicinity of the bottom surface 1C of the refrigerator main body, and the Stirling refrigerator 4 is provided on the back side of the refrigerator main body 1A and above the drain pan 12B. Further, when the refrigerator main body 1A is installed in front of the wall 32, an airflow passage 40 is formed so as to reach the high temperature part 2 of the Stirling refrigerator 4 from the drain pan 12B. The fans 8 and 12C are installed in the passage 40.

  The drain pan 12B has a main drain pan 35 (first drain pan) into which drain water from the cooling body 1A flows, a sub drain pan 36 (second drain pan) connected to the main drain pan 35, and drain water overflowing from the main drain pan 35. An overflow pipe 37 (communication path) leading to the sub drain pan 36 is provided, and the fan 12C is installed in the vicinity of the main drain pan 35.

  Although the embodiments of the present invention have been described above, the embodiments disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a piping system diagram of a Stirling cooler according to one embodiment of the present invention. It is the sectional side view which showed the Stirling refrigerator in the Stirling refrigerator which concerns on one embodiment of this invention. It is the figure which showed arrangement | positioning of the several fan in the Stirling refrigerator which concerns on one embodiment of this invention. It is the figure which showed an example of arrangement | positioning of the 1st and 2nd drain pan in the Stirling refrigerator which concerns on one embodiment of this invention. It is the figure which showed the modification of arrangement | positioning of the 1st and 2nd drain pan in the Stirling refrigerator which concerns on one embodiment of this invention. It is a figure which shows the VI-VI cross section in FIG.

Explanation of symbols

  1 Stirling cooler, 1A cooler body, 1B back of cooler body, 1C bottom surface of cooler body, 2 high temperature part, 2A-2E pipe (high temperature side circulation circuit), 3 low temperature part, 3A, 3B pipe (low temperature side circulation circuit) ) 4 Stirling refrigerator, 5 High temperature side evaporator, 6 Circulation pump, 7 High temperature side condenser, 8 Fan, 9 Condensation prevention pipe, 10 Low temperature side condenser, 11 Low temperature side evaporator, 12 Fan, 12A Drain pipe, 12B drain pan, 12C fan, 31 machine room, 32 walls, 33 guide duct, 34 ion generator, 35 main drain pan, 36 sub drain pan, 37 overflow pipe, 38 partition, 39 opening, 40 passage.

Claims (5)

The refrigerator body,
A Stirling engine provided in the refrigerator main body,
The first and second fans that are provided inside or around the refrigerator main body and generate airflow,
The second fan is a Stirling cooler provided to generate an air flow along the flow of the air flow downstream of the air flow flowing along the outer shell wall of the cooler body generated by the first fan. The Stirling engine has a high temperature part and a low temperature part,
The Stirling refrigerator is
A radiator as a cooling means of the high temperature part of the Stirling engine,
Provided in the vicinity of the cooling body, and further comprising a drain pan for storing drain water from the cooling body,
The first fan is provided in the vicinity of the drain pan,
The Stirling cooler according to claim 1, wherein the second fan is provided in the vicinity of the radiator. The drain pan is provided in the vicinity of the bottom surface of the refrigerator main body,
The Stirling cooler according to claim 2, wherein the Stirling engine is provided on the back side of the cooler main body and above the drain pan. The drain pan includes a first drain pan into which drain water from the cooling body flows, a second drain pan connected to the first drain pan, and a communication path that guides drain water overflowing from the first drain pan to the second drain pan. And
The Stirling cooler according to claim 2 or 3, wherein the first fan is installed in the vicinity of the first drain pan.   The Stirling cooler according to any one of claims 2 to 4, wherein the first fan generates an air flow toward the water surface of the drain water stored in the drain pan.

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