JP2005172329A - Cooling storage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling storage comprising a Stirling refrigeration engine capable of sufficiently exerting its freezing performance by increasing heat radiating efficiency of the Stirling refrigeration engine. <P>SOLUTION: A heat exchanger 42 for inside cooling is connected with a low temperature-side heat exchanger 41 mounted on a low temperature part of the Stirling refrigeration engine 30 to form a low temperature-side refrigerant circulating circuit 40. A first high temperature-side heat exchanger 51 and a second high temperature-side heat exchanger 61 are mounted on a high-temperature part of the Stirling refrigeration engine 30. A heat exchanger 52 for heat radiation is connected with the first high temperature-side heat exchanger 51 to form a first high temperature-side refrigerant circulating circuit 50. A heat exchanging part 62 for promoting the evaporation of drain and a heat exchanging part 63 for preventing dew condensation on a wall of the cooling storage are connected with the second high temperature-side heat exchanger 61 to form a second high temperature-side refrigerant circulating circuit 60. The first high temperature-side refrigerant circulating circuit 50 circulates the refrigerant by natural circulation. The second high temperature-side refrigerant circulating circuit 60 is provided with a circulation pump 64 for forcibly circulating the refrigerant. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

    The present invention relates to a refrigerator that cools the inside of a warehouse by a Stirling engine. "Refrigerator" is a concept that refers to all devices that lower the temperature of an enclosed space called "inside" for the preservation of food and other items. Products such as "refrigerator", "freezer", and "refrigerated refrigerator" No matter what the name.

    Specific chlorofluorocarbon (CFC) and alternative chlorofluorocarbon (HCFC) are used as refrigerants in the refrigeration cycle of the refrigerator. The production and use of these refrigerants is subject to international regulations, as they are, to some extent, lead to the destruction of the ozone layer.

Therefore, Stirling refrigeration engines that do not use ozone-depleting substances as a refrigerant are in the spotlight. The Stirling refrigeration engine uses an inert gas such as helium as the working medium, and the piston and displacer are operated by external power to repeatedly compress and expand the working medium. The low temperature part (cold section) and the high temperature part (warm section) Form. Then, heat is absorbed from the inside in the low temperature part, and heat is radiated to the surrounding environment in the high temperature part. An example of a refrigerator using a Stirling refrigeration engine can be found in US Pat.
JP-A-3-36468 (page 3-5, FIG. 1)

    The Stirling refrigeration engine has a compact configuration, and both the low temperature part and the high temperature part have a smaller surface area than the refrigeration capacity. Therefore, how efficiently the heat absorption and heat dissipation are performed has a great influence on the performance of the refrigerator. In the refrigerator described in Patent Document 1, a high temperature side heat exchanger of a Stirling refrigeration engine is placed in a heat radiation path where a heat radiating fan forms an air flow, and heat is released from the high temperature side heat exchanger by forced air cooling.

    In the forced air cooling system configured as described above, a radiator having a large number of fins arranged at a high density needs to be attached to the high temperature portion in order to remove sufficient heat from the high temperature portion having a small heat transfer area. In addition, a large amount of cooling air needs to be blown to the radiator. Such a structure is accompanied by problems such as dust clogging between radiating fins, loud noise caused by blowing air, or a large amount of power consumed by the blowing fan.

    In addition, the air cooling method has a large thermal resistance in the first place, and it is difficult to take heat away. Therefore, there is a problem that the temperature difference between the high temperature portion and the surrounding environment is not easily reduced and the COP (coefficient of performance) of the Stirling refrigeration engine is not improved.

    Further, in the refrigerator, the low-temperature air in the storage comes into contact with a gasket provided on the door or a cooling wall surrounded by the gasket. For this reason, heat is taken away from the outer surface of the gasket or the cooling wall facing the outside in the periphery, and moisture in the air is condensed. Condensation causes water droplets to drip and wet the floor, and rust is generated on the cooling wall where the steel sheet is painted. In order to prevent this, in the conventional refrigerator, an electric heater is disposed in the wall near the gasket to prevent condensation, and there is a problem that power consumption increases.

    Furthermore, the heat exchanger for cooling the inside of the refrigerator is inevitably frosted. If the frost is left on, the cooling capacity decreases, so it is necessary to remove the frost from time to time to restore the cooling capacity. Drain generated by frost melting or other causes is received by the drain pan. In order to eliminate the trouble of removing the drain pans one by one and discarding the drains, a method is generally employed in which heat is applied to the drain pans to promote drain evaporation. In a conventional refrigerator that compresses a refrigerant with a compressor, the drain pan can be heated by using heat accompanying refrigerant compression. However, a refrigerator using a Stirling refrigeration engine does not include an element equivalent to a conventional compressor, and it is necessary to use an electric heater to heat the drain pan, which also increases power consumption.

    In addition, conventionally, an electric heater has been used to defrost by heating the internal-cooling heat exchanger, and power consumption has increased accordingly.

    The present invention has been made in view of the above points, and an object of the present invention is to improve the heat radiation efficiency of the Stirling refrigeration engine in a refrigerator that cools the interior by the Stirling refrigeration engine, and the refrigeration capacity of the Stirling refrigeration engine. It is to be able to fully demonstrate. Another object is to use the heat generated by the high temperature part of the Stirling refrigeration engine to improve the function of the refrigerator and at the same time reduce the power consumption.

    In order to solve the above problems, in the present invention, the refrigerator is configured as follows.

    (1) In a refrigerator that cools the interior with a Stirling refrigeration engine, the heat of the high-temperature part of the Stirling refrigeration engine is transmitted to a gas-liquid two-phase refrigerant to promote drain evaporation, prevent condensation on the refrigerator wall, and the interior Used for at least one defrosting of the cooling heat exchanger.

    (2) In a refrigerator that cools the inside by a Stirling refrigeration engine, a first high-temperature side refrigerant circulation circuit that dissipates heat from the high-temperature portion of the Stirling refrigeration engine to the outside of the chamber, and promotes evaporation of drainage from the heat of the high-temperature portion. And a second high-temperature side refrigerant circulation circuit that is used for at least one of prevention of dew condensation on the cooling wall and defrosting of the heat exchanger for cooling in the refrigerator.

    (3) In the refrigerator configured as described above, the first high temperature side refrigerant circulation circuit and the second high temperature side refrigerant circulation circuit are made independent of each other.

    (4) In the refrigerator configured as described above, the first high temperature side refrigerant circulation circuit circulates the refrigerant by natural circulation, and the second high temperature side refrigerant circulation circuit circulates the refrigerant by forced circulation.

    (5) In a refrigerator that cools the inside by a Stirling refrigeration engine, a high-temperature side heat exchanger provided in a high-temperature part of the Stirling refrigeration engine, a heat-dissipating heat exchanger for dissipating heat to the outside environment, A first high-temperature side refrigerant circulation circuit, which is a loop thermosyphon formed between the high-temperature side heat exchanger and the heat-dissipating heat exchanger, accelerates the evaporation of the drainage heat from the high-temperature part, and prevents condensation on the refrigerator wall And a second high temperature side refrigerant circulation circuit used for at least one of defrosting of the internal cooling heat exchanger, and a circulation pump for sending the refrigerant in the high temperature side heat exchanger to the second high temperature side refrigerant circulation circuit With.

    (6) In a refrigerator that cools the inside of the storage by a Stirling refrigeration engine, a first high-temperature side refrigerant circulation circuit that dissipates heat from the high temperature portion of the Stirling refrigeration engine to the outside of the storage, and promotes evaporation of drainage from the heat of the high temperature portion. And forming a second high-temperature side refrigerant circulation circuit for use in at least one of prevention of dew condensation on the cooling wall and defrosting of the heat exchanger for cooling inside the cabinet, and the first high-temperature side refrigerant circulation circuit and the second The high temperature side refrigerant circulation circuit is connected in parallel to a common high temperature side heat exchanger provided in the high temperature section.

    (7) In the refrigerator configured as described above, a plurality of the high temperature side heat exchangers are provided, and the first high temperature side refrigerant circulation circuit and the second high temperature side refrigerant circulation circuit are connected to the plurality of high temperature side heats. Connect to each of the exchangers in parallel with each other.

    Then, all of the plurality of high temperature side heat exchangers supply refrigerant to the first high temperature side refrigerant circulation circuit and the second high temperature side refrigerant circulation circuit, and all of the plurality of high temperature side heat exchangers On the other hand, the refrigerant recirculates from the first high temperature side refrigerant circulation circuit and the second high temperature side refrigerant circulation circuit.

    Further, the first high temperature side refrigerant circulation circuit is configured as a loop thermosyphon, and for the second high temperature side refrigerant circulation circuit, the refrigerant in the high temperature side heat exchanger is sent to the second high temperature side refrigerant circulation circuit. Provide a pump.

    Further, the circulation pump is disposed in the most upstream part of the second high temperature side refrigerant circulation circuit.

    (8) In the refrigerator configured as described above, the reflux refrigerant pipe of the first high temperature side refrigerant circulation circuit is connected to the suction side of the circulation pump.

    (9) In the refrigerator configured as described above, the refrigerant is used in a gas-liquid two-phase form in one or both of the first high temperature side refrigerant circulation circuit and the second high temperature side refrigerant circulation circuit.

    (10) In a refrigerator that cools the interior with a Stirling refrigeration engine, a heat exchange unit provided for promoting evaporation of drain and a heat exchange unit provided for preventing condensation on the refrigerator wall are connected in parallel. This parallel connection structure is connected in series to a heat exchanger provided in the high temperature part of the Stirling refrigeration engine to form a high temperature side refrigerant circulation circuit.

    (11) In a refrigerator that cools the interior with a Stirling refrigeration engine, a heat exchanger provided in a high-temperature part of the Stirling refrigeration engine, a heat exchange part provided to promote evaporation of drain, and condensation in a refrigerator wall A high-temperature side refrigerant circulation circuit is formed by connecting in series with a heat exchange unit provided for prevention.

    (12) In the refrigerator configured as described above, a low-temperature side refrigerant circulation circuit including a heat exchanger provided in a low-temperature portion of the Stirling refrigeration engine and a heat exchanger for cooling in the refrigerator is formed, and the refrigerator A defrosting heat exchange part is provided for the internal cooling heat exchanger, and a high temperature side refrigerant circulation circuit including the defrosting heat exchange part and a heat exchanger provided in a high temperature part of the Stirling refrigeration engine is formed.

    (13) In the refrigerator configured as described above, a heat storage unit is provided in a high temperature side refrigerant circulation circuit including the heat exchanger for defrosting and a heat exchanger provided in a high temperature part of the Stirling refrigeration engine.

    (1) In a refrigerator that cools the interior with a Stirling refrigeration engine, the heat of the high-temperature part of the Stirling refrigeration engine is transferred to a gas-liquid two-phase refrigerant to accelerate drain evaporation, prevent condensation on the refrigerator wall, and cool the interior Because it is used for at least one defrosting of the heat exchanger for the heat, the heat radiation of the high temperature part of the Stirling refrigeration engine is used to promote the evaporation of the drain, prevent the condensation of the cooling wall, and the defrosting of the heat exchanger for cooling the inside of the refrigerator. Can be used effectively. As a result, the drain can be made maintenance-free. In addition, it is possible to prevent condensation on the wall of the refrigerator without using an electric heater, and to defrost the internal heat exchanger for cooling, improving the function or convenience of the refrigerator and heating with an electric heater Power consumption can be suppressed compared to.

    In addition, since the cold heat having a temperature lower than that of the surrounding environment is recovered from the drain water, the dew condensation concern portion, or the internal cooling heat exchanger to cool the high temperature portion of the Stirling refrigeration engine, the heat dissipation efficiency of the entire heat dissipation system is improved. The COP of the Stirling refrigeration engine is also improved, and the power consumption of the refrigerator can be reduced.

    And since a refrigerant | coolant is used in the form of a gas-liquid two phase, the latent heat of evaporation / condensation of a refrigerant | coolant will be utilized for heat exchange, a thermal resistance can be restrained small, and thermal radiation efficiency will increase. As a result, the heat exchange efficiency is dramatically increased, the efficiency of the Stirling refrigeration engine is improved, and the power consumption can be reduced.

    (2) In a refrigerator that cools the interior with a Stirling refrigeration engine, by providing a first high-temperature side refrigerant circulation circuit that dissipates heat from the high-temperature portion of the Stirling refrigeration engine to the outside, the heat of the high-temperature portion is stabilized. Can dissipate heat. In addition, since the second high-temperature side refrigerant circulation circuit that uses heat of the high-temperature part for at least one of acceleration of drain evaporation, prevention of condensation on the cooling wall, and defrosting of the heat exchanger for cooling in the refrigerator is provided, Stirling The heat radiation of the high temperature part of the refrigeration engine can be effectively used for work such as promoting the evaporation of drain, preventing condensation on the cooling wall, and defrosting the heat exchanger for cooling in the refrigerator. As a result, the drain can be made maintenance-free. In addition, it is possible to prevent condensation on the wall of the refrigerator without using an electric heater, and to defrost the internal heat exchanger for cooling, improving the function or convenience of the refrigerator and heating with an electric heater Power consumption can be suppressed compared to.

    In addition, since the cold heat having a temperature lower than that of the surrounding environment is recovered from the drain water, the dew condensation concern portion, or the internal cooling heat exchanger to cool the high temperature portion of the Stirling refrigeration engine, the heat dissipation efficiency of the entire heat dissipation system is improved. The COP of the Stirling refrigeration engine is also improved, and the power consumption of the refrigerator can be reduced.

    (3) In the refrigerator configured as described above, since the first high temperature side refrigerant circulation circuit and the second high temperature side refrigerant circulation circuit are made independent of each other, while ensuring heat radiation by the first high temperature side refrigerant circulation circuit, The second high-temperature refrigerant circulation circuit can be used flexibly to accelerate drain evaporation, prevent condensation on the cooling wall, or defrost the internal heat exchanger for cooling. This means that the circulation pump in the second high-temperature side refrigerant circulation circuit is not always operated, but only when it is necessary to promote drain evaporation and prevent condensation around the door. Thereby, the power consumption of the circulation pump can be saved and the operation life of the circulation pump can be extended. Moreover, since the door periphery is not heated longer than necessary, the heat load of the refrigerator can be reduced and the power consumption can be suppressed.

    (4) In the refrigerator configured as described above, the first high temperature side refrigerant circulation circuit circulates the refrigerant by natural circulation, and the second high temperature side refrigerant circulation circuit circulates the refrigerant by forced circulation. In the side refrigerant circulation circuit, constant heat dissipation can be achieved without using artificial energy. On the other hand, in the second high-temperature side refrigerant circulation circuit, the refrigerant can be forcedly circulated when necessary to achieve heat dissipation or cold recovery. Thereby, it can cool efficiently, without consuming energy unnecessarily.

    (5) In a refrigerator that cools the interior with a Stirling refrigeration engine, between a high-temperature side heat exchanger provided in a high-temperature part of the Stirling refrigeration engine and a heat-dissipating heat exchanger for radiating heat to the outside environment. Since the first high-temperature side refrigerant circulation circuit that is a loop-shaped thermosyphon is formed, the first high-temperature side refrigerant circulation circuit is used to extract heat from the high-temperature side heat exchanger without using artificial energy. Can do. On the other hand, in the second high temperature side refrigerant circulation circuit, the refrigerant is sent by a circulation pump, and at least one of the heat of the high temperature portion is promoted to evaporate the drain, the condensation of the cooling wall is prevented, and the defrosting of the heat exchanger for cooling in the warehouse. Can be used reliably.

    (6) In a refrigerator that cools the interior with a Stirling refrigeration engine, a first high-temperature side refrigerant circulation circuit that dissipates heat from the high-temperature portion of the Stirling refrigeration engine to the outside of the chamber, and promotes evaporation and cooling of the heat from the high-temperature portion. A second high temperature side refrigerant circulation circuit and a second high temperature side refrigerant circuit are formed for use in at least one of dew condensation prevention of the warehouse wall and defrosting of the heat exchanger for cooling inside the cabinet. Since the circulation circuit is connected in parallel to the common high temperature side heat exchanger provided in the high temperature section, the circuit cannot be used for any reason in one of the first high temperature side refrigerant circulation circuit and the second high temperature side refrigerant circulation circuit. Even if it becomes, heat dissipation from a high temperature part can be continued by the other circuit. For this reason, it becomes easy to avoid the situation where the Stirling refrigerating engine suffers damage due to poor heat dissipation.

    (7) In the cooler configured as described above, a plurality of high temperature side heat exchangers are provided, and the first high temperature side refrigerant circulation circuit and the second high temperature side refrigerant circulation circuit are provided with a plurality of high temperature side heat exchangers. Therefore, a plurality of high-temperature side refrigerant circulation circuits are secured regardless of which high-temperature side heat exchanger is picked up, and it is easy to avoid a situation such as a refrigerant circulation stop due to circuit blockage. .

    Then, the refrigerant is supplied to the first high temperature side refrigerant circulation circuit and the second high temperature side refrigerant circulation circuit from all of the plurality of high temperature side heat exchangers, and for all of the plurality of high temperature side heat exchangers, Since the refrigerant recirculates from the first high temperature side refrigerant circulation circuit and the second high temperature side refrigerant circulation circuit, all of the plurality of high temperature side heat exchangers can be involved in the heat supply to the outside.

    Furthermore, since the first high-temperature side refrigerant circulation circuit is configured as a loop thermosyphon, heat is extracted from the high-temperature side heat exchanger using the first high-temperature side refrigerant circulation circuit without using artificial energy. be able to. Further, in the second high temperature side refrigerant circulation circuit, the refrigerant is sent by a circulation pump, and at least one of the heat of the high temperature part is promoted to evaporate the drain, the condensation on the cooling wall is prevented, and the defrosting of the heat exchanger for cooling the inside of the warehouse. Can be used reliably.

    In addition, since the circulation pump is arranged at the most upstream part of the second high temperature side refrigerant circulation circuit, the pipe resistance from the high temperature side heat exchanger to the circulation pump is small, and the refrigerant smoothly flows into the circulation pump. If the resistance of the pipe for supplying the refrigerant to the circulation pump is large, cavitation occurs on the suction side of the circulation pump, and the refrigerant evaporates unnecessarily, which may impair the circulation efficiency. Such a situation can be avoided if the circulation pump is arranged at the most upstream part of the second high temperature side refrigerant circulation circuit.

    (8) In the refrigerator configured as described above, since the refrigerant pipe for recirculation of the first high temperature side refrigerant circulation circuit is connected to the suction side of the circulation pump, the refrigerant flowing through the second high temperature side refrigerant circulation circuit is It is possible to increase the total amount of heat of the refrigerant flowing through the second high temperature side refrigerant circulation circuit by merging the refrigerant having the saturation temperature flowing through the first high temperature side refrigerant circulation circuit. Thereby, the utilization efficiency of the heat which a Stirling refrigerating engine generates can be improved.

    (9) In the refrigerator configured as described above, the refrigerant is used in a gas-liquid two-phase form in one or both of the first high temperature side refrigerant circulation circuit and the second high temperature side refrigerant circulation circuit.・ Condensation latent heat is used for heat exchange, heat resistance can be kept small, and heat dissipation efficiency is increased. As a result, the heat exchange efficiency is dramatically increased, the efficiency of the Stirling refrigeration engine is improved, and the power consumption can be reduced.

    (10) In a refrigerator that cools the interior with a Stirling refrigeration engine, a heat exchange unit provided for promoting evaporation of drain and a heat exchange unit provided for preventing condensation on the refrigerator wall are connected in parallel. Since this parallel connection structure is connected in series to the heat exchanger provided in the high-temperature part of the Stirling refrigeration engine to form a high-temperature side refrigerant circulation circuit, the heat radiation of the high-temperature part of the Stirling refrigeration engine is promoted to promote the evaporation of drain and the cooling wall It can be effectively used to prevent condensation. As a result, the drain can be made maintenance-free. Further, condensation on the wall of the refrigerator can be prevented without using an electric heater, so that the function or usability of the refrigerator can be improved and the power consumption can be suppressed as compared with the case where an electric heater is used.

    Since the latent heat of evaporation / condensation of the refrigerant is used for heat exchange, the thermal resistance can be kept small, and the heat dissipation efficiency is increased. This improves the efficiency of the Stirling refrigeration engine and can reduce power consumption.

    Moreover, since the cold heat whose temperature is lower than the surrounding environment is recovered from the drain water and the dew condensation concern part and the high temperature part of the Stirling refrigeration engine is cooled, the heat radiation efficiency of the entire heat radiation system is improved. The COP of the Stirling refrigeration engine is also improved, and the power consumption of the refrigerator can be reduced.

    Since the heat exchanging part provided for promoting the evaporation of the drain and the heat exchanging part provided for preventing condensation on the cooling wall are connected in parallel, the flow resistance of the refrigerant can be lowered. Since the flow resistance of the refrigerant is low, the power consumption of the circulating pump can be greatly reduced.

    In the parallel structure part, if the valves are connected in series to the heat exchange part provided for promoting drain evaporation and the heat exchange part provided for preventing condensation on the refrigerator wall, The heat exchange section on the side where it is not necessary to flow the refrigerant can stop the flow of the refrigerant, and the power consumption can be reduced by reducing the load of the circulation pump. Moreover, since the door periphery is not heated longer than necessary, the heat load of the refrigerator can be reduced and the power consumption can be suppressed.

    (11) In a refrigerator that cools the interior with a Stirling refrigeration engine, a heat exchanger provided in a high-temperature part of the Stirling refrigeration engine, a heat exchange part provided to promote evaporation of drain, and prevention of condensation on the refrigerator wall Since the high-temperature side refrigerant circulation circuit is formed by connecting in series with the heat exchange section provided for the purpose, the heat radiation from the high-temperature section of the Stirling refrigeration engine can be effectively used for promoting drain evaporation and preventing condensation on the refrigerator wall. As a result, the drain can be made maintenance-free. Further, condensation on the wall of the refrigerator can be prevented without using an electric heater, so that the function or usability of the refrigerator can be improved and the power consumption can be suppressed as compared with the case where an electric heater is used.

    Since the heat exchanger provided in the high-temperature part of the Stirling refrigeration engine, the heat exchange part provided to accelerate drain evaporation, and the heat exchange part provided to prevent condensation on the refrigerator wall are connected in series, the piping configuration Is simple and requires fewer assembly steps.

    (12) In the cooler configured as described above, a low-temperature side refrigerant circulation circuit including a heat exchanger provided in a low-temperature part of the Stirling refrigeration engine and a heat exchanger for cooling the interior is formed, and the interior is cooled The heat exchanger for defrosting is provided in the heat exchanger for heat and a high temperature side refrigerant circulation circuit including the heat exchanger for defrosting and the heat exchanger provided in the high temperature part of the Stirling refrigeration engine is formed. Defrosting can be performed without using a frost electric heater. Since the cold heat of the frost is recovered and the high temperature part is cooled, the heat load of the heat dissipation system is reduced, and the heat dissipation efficiency of the entire heat dissipation system is improved.

    (13) In the refrigerator configured as described above, since the heat storage unit is provided in the high-temperature side refrigerant circulation circuit including the heat exchange unit for defrosting and the heat exchanger provided in the high-temperature unit of the Stirling refrigeration engine, Stirling is provided. Even if the refrigeration engine is stopped, defrosting can be performed using heat stored in the heat storage section. The cold heat of the frost is collected in the heat storage part and used to cool the high temperature part during normal operation, reducing the heat load of the heat dissipation system and improving the heat dissipation efficiency of the entire heat dissipation system. As a result, the operating COP of the Stirling refrigerating engine 30 is improved, and the power consumption can be reduced.

    Hereinafter, embodiments of the present invention will be described with reference to the drawings.

    FIG. 1 shows a cross section of the refrigerator. The refrigerator 1 is for food preservation and includes a housing 10 having a heat insulating structure. The housing 10 is provided with three upper and lower cooling chambers 11, 12, and 13. Each of the cooling chambers 11, 12, and 13 has an opening on the front side (left side in FIG. 1) of the housing 10, and the heat insulating doors 14, 15, and 16 that can be opened and closed are closed. Gaskets 17 each having a shape surrounding the openings of the cooling chambers 11, 12, 13 are mounted on the back surfaces of the heat insulating doors 14, 15, 16. Inside the cooling chambers 11, 12, and 13, shelves 18 suitable for the type of food to be stored are installed as appropriate.

    A cooling system and a heat dissipation system having a Stirling refrigeration engine as a central element are installed from the upper surface to the rear surface and further to the lower surface of the housing 10. FIG. 1 (sectional view) and FIG. 2 (pipe configuration diagram) show the first embodiment.

Storage spaces 19 are provided at the corners of the upper surface and the rear surface of the housing 10, and the Stirling refrigeration engine 30 is installed here. A part of the Stirling refrigerating engine 30 becomes a low temperature part, and the low temperature side heat exchanger 41 is attached here. An interior cooling heat exchanger 42 is installed in the back of the cooling chamber 13. The low temperature side heat exchanger 41 and the internal cooling heat exchanger 42 are connected by a refrigerant pipe to constitute a low temperature side refrigerant circulation circuit 40 (see FIG. 2). The low-temperature side refrigerant circulation circuit 40 is filled with a natural refrigerant such as CO ₂ . A large number of fins are provided inside the low temperature side heat exchanger 41 so that heat can be efficiently exchanged with the refrigerant.

    Inside the housing 10 is provided a duct 20 that distributes the air deprived of heat by the internal cooling heat exchanger 42 to the cooling chambers 11, 12, and 13. The duct 20 has a cold air outlet 21 in communication with the cooling chambers 11, 12, and 13 at appropriate positions. A blower fan 22 for forcibly supplying cool air is installed in the duct 20 at a proper place.

    Although not shown, the housing 10 is also provided with a duct for collecting air from the cooling chambers 11, 12, and 13. This duct has a blower outlet below the interior cooling heat exchanger 42 and supplies the air to be cooled to the interior cooling heat exchanger 42 as indicated by the broken line arrows in FIG.

    A drain receiving rod 25 is provided under the internal cooling heat exchanger 42. The drain receptacle 25 collects the dripping from the internal cooling heat exchanger 42 and flows it out to the drain pan 26 provided on the bottom surface of the housing 10.

    The other part of the Stirling refrigerating engine 30 becomes a high temperature part, and a high temperature side heat exchanger is attached here. In the case of the first embodiment, the high temperature side heat exchanger includes a first high temperature side heat exchanger 51 and a second high temperature side heat exchanger 61 each having a shape in which a ring is halved. A large number of fins are provided in the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61, respectively, so that heat can be efficiently exchanged with the refrigerant.

    If the high temperature side heat exchanger has the shape of a single ring, it is necessary to strictly manage the shape and secure the fitting accuracy in order to firmly contact the high temperature portion of the Stirling refrigeration engine 30. However, in the case of the present embodiment, the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61 have a shape in which the ring is halved, so that when the high temperature portion of the Stirling refrigeration engine 30 is sandwiched between the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61 By adjusting the tightening pressure, the contact pressure with the high temperature part can be controlled. That is, the contact pressure becomes insufficient due to the shape error, and the heat transfer coefficient with the high temperature portion is unlikely to fall. The same is true if the ring is divided into more blocks.

    The first high temperature side refrigerant circulation circuit 50 is configured to include the first high temperature side heat exchanger 51, and the second high temperature side refrigerant circulation circuit 60 is configured to include the second high temperature side heat exchanger 61.

    The first high-temperature side refrigerant circulation circuit 50 includes a first high-temperature side heat exchanger 51, a heat-dissipation heat exchanger 52 installed on the upper surface of the housing 10, and a refrigerant pipe that connects these in a closed loop shape. The heat-dissipating heat exchanger 52 radiates heat to the outside environment, and is provided with a blower fan 53. The first high-temperature refrigerant circulation circuit 50 is sealed with water (including an aqueous solution) or a hydrocarbon-based refrigerant. The first high-temperature side refrigerant circulation circuit 50 functions as a loop thermosyphon, and the refrigerant naturally circulates.

    The second high temperature side refrigerant circulation circuit 60 includes a second high temperature side heat exchanger 61, heat exchange units 62 and 63, a circulation pump 64 for forced refrigerant circulation, and a refrigerant pipe connecting them. The second high temperature side refrigerant circulation circuit 60 is filled with a natural refrigerant such as water. In the present specification, the refrigerant discharge side of the second high temperature side heat exchanger 61 is expressed as the “most upstream part” of the second high temperature side refrigerant circuit 60. The circulation pump 64 is disposed at the most upstream part.

    The heat exchanging part 62 has a part of the pipe made in a zigzag shape, and is disposed under the drain pan 24 and plays a role of heating the drain accumulated in the drain pan 24 with the heat of the refrigerant to promote its evaporation. .

    The heat exchanging part 63 is a part of the piping routed to the openings of the cooling chambers 11, 12, and 13, and plays the role of preventing dew condensation by heating this part with the warm heat of the refrigerant. .

    Next, the operation of the refrigerator 1 will be described.

    When the Stirling refrigerating engine 30 is driven, the low temperature part is cooled and the temperature of the high temperature part is increased. The low temperature side heat exchanger 41 is deprived of heat, and the internal refrigerant flows into the internal cooling heat exchanger 42 through the low temperature side refrigerant circulation circuit 40 in a condensed state.

    The refrigerant that has flowed into the internal cooling heat exchanger 42 evaporates in the internal cooling heat exchanger 42 and lowers the surface temperature of the internal cooling heat exchanger 42. The air passing through the internal cooling heat exchanger 42 is deprived of heat and becomes cold air, blown out from the cold air outlet 21 of the duct 20 to the cooling chambers 11, 12, 13, and lowers the temperature of the cooling chambers 11, 12, 13. Thereafter, the air flows back to the internal cooling heat exchanger 42 through a duct (not shown).

    The evaporated refrigerant flows back to the low temperature side heat exchanger 41 through the low temperature side refrigerant circulation circuit 40, and is deprived of heat and condensed. Then, it flows again to the internal cooling heat exchanger 42.

    The heat generated when the Stirling refrigeration engine 30 performs work and the heat recovered by the low temperature portion from the interior are dissipated from the high temperature portion. The first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61 are heated by this heat.

    When the first high temperature side heat exchanger 51 is heated, the internal refrigerant evaporates and flows into the heat dissipation heat exchanger 52. The blower fan 53 blows air onto the surface of the heat exchanger 52 for heat dissipation, and the refrigerant is condensed by being deprived of heat. The condensed refrigerant is refluxed to the first high temperature side heat exchanger 51 and evaporated again. In this way, the cycle in which the refrigerant receives heat from the high temperature portion of the Stirling refrigeration engine 30 and evaporates and transmits it to the cooling air by the heat-dissipating heat exchanger 52 to condense is repeated.

    In the first high-temperature side refrigerant circulation circuit 50, the refrigerant is used in a gas-liquid two-phase form in which a gas phase and a liquid phase are mixed. The heat exchange accompanied by the gas-liquid two-phase change is performed by evaporating / condensing the refrigerant and using latent heat. For this reason, compared with the heat exchange which does not accompany a phase change, a heat transfer rate improves dramatically.

The above will be described. The heat dissipation amount Q of the Stirling refrigerating engine 30 is expressed by the following equation.
Q = h · A · ΔTm
Here, h: heat transfer coefficient A: heat transfer area ΔTm: temperature difference Accordingly, the higher the heat transfer coefficient h, the lower the temperature of the high temperature section of the Stirling refrigeration engine 30 and the COP.

    Generally, in the case of using a brine type refrigerant without phase change, the heat transfer coefficient is several hundred to 1000 w / m 2 k. Moreover, the heat transfer rate is proportional to the power consumption of the pump for circulating the brine.

    On the other hand, in the heat exchange accompanied by the phase change of the gas-liquid two phases, since the latent heat in the evaporation / condensation process of the refrigerant is used, a heat transfer coefficient of 3000 to 10000 w / m 2 k can be obtained. The value of this heat transfer coefficient reaches several times to 10 times the value in the case of the brine method.

    In the first high temperature side refrigerant circulation circuit 50, the refrigerant is circulated as a gas-liquid two-phase flow as described above, so that heat can be exchanged efficiently. The heat resistance generated at the time of heat exchange is extremely low, and the high temperature part of the Stirling refrigerating engine 30 is kept at a lower temperature even under the same conditions (equivalent environmental temperature and equivalent heat dissipation). As a result, the operating COP of the Stirling refrigerating engine 30 is improved, and the power consumption can be reduced.

    When the second high temperature side heat exchanger 61 is heated, the refrigerant evaporates. Again, the refrigerant is used in a gas-liquid two-phase form. The circulation pump 64 sends out the gas-liquid two-phase refrigerant to the heat exchange units 62 and 63.

    The refrigerant first flows through the heat exchanging portion 62 and transfers heat to the drain pan 26 thereabove. As a result, the temperature of the drain in the drain pan 26 rises without using an electric heater, and evaporation is promoted. Accordingly, the work of discarding the drain accumulated in the drain pan 26 becomes unnecessary, and the drain can be made maintenance-free.

    Subsequently, the refrigerant flows through the heat exchanging unit 63 and heats the periphery of the openings of the cooling chambers 11, 12, and 13. Condensation is likely to occur at a location where the gasket 17 is in contact with the housing 10, that is, a boundary region between the inside and outside of the cabinet. By passing the refrigerant in this way, the temperature at the location where the outside of the cooling wall is in contact with the air is reduced. It is kept above the dew point temperature, and condensation is prevented without using an electric heater.

    The refrigerant collects cold heat from the drain at the heat exchange unit 62, and collects cold heat from the housing 10 at the heat exchange unit 63. Thus, the refrigerant | coolant which collect | recovered cold heat returns to a liquid phase what was a gaseous phase, and flows into the 2nd high temperature side heat exchanger 61 in the form of the single phase of a liquid phase. Then, by contacting with the gas phase, the gas phase is liquefied to lower the vapor pressure, thereby promoting evaporation and recovering the gas-liquid two-phase again. In this way, a cycle is repeated in which the refrigerant receives heat from the high temperature portion of the Stirling refrigerating engine 30 and evaporates, condenses and dissipates heat in the heat exchanging portions 62 and 63, and collects the cold heat. If the operation of the circulation pump 64 is stopped, this cycle is interrupted.

    The refrigerant supplies the heat to the drain and to the vicinity of the openings of the cooling chambers 11, 12, and 13, and instead collects the cold heat in a temperature zone lower than the environment to cool the high temperature portion of the Stirling refrigerating engine 30. For this reason, the heat load of the heat dissipation system is reduced, and the heat dissipation efficiency of the entire heat dissipation system is also improved. As a result, the operating COP of the Stirling refrigerating engine 30 is improved, and the power consumption can be reduced.

    The first high temperature side refrigerant circulation circuit 50 and the second high temperature side refrigerant circulation circuit 60 are independent of each other and are provided in parallel. For this reason, the heat radiation by the first high temperature side refrigerant circulation circuit 50 and the heat radiation by the second high temperature side refrigerant circulation circuit 60 can be performed independently without depending on each other. This means that individual operation control based on the heat load state of the refrigerator 1 becomes possible. For example, the circulation pump 64 is not always operated, but can be operated only when it is necessary to promote drain evaporation and prevent condensation around the door. Thereby, the power consumption of the circulation pump 64 can be saved, and the operating life of the circulation pump 64 can be extended.

    Further, since the circulation pump 64 is disposed at the most upstream part of the second high temperature side refrigerant circulation circuit 60, the pipe resistance from the second high temperature side heat exchanger 61 to the circulation pump 64 is small, and the refrigerant is smoothly circulated. 64. If the resistance of the pipe for supplying the refrigerant to the circulation pump 64 is large, cavitation occurs on the suction side of the circulation pump 64 and the refrigerant evaporates unnecessarily, thereby impairing the circulation efficiency. Is disposed at the most upstream portion of the second high temperature side refrigerant circulation circuit 60, such a situation can be avoided.

    Regarding the gas-liquid two-phase, in the second high-temperature side refrigerant circulation circuit 60, the refrigerant may be only in the liquid phase when the heat exchange units 62 and 63 perform the drain treatment and the dew condensation prevention. When the refrigerant is refluxed to the second high temperature side heat exchanger 61, latent heat exchange is performed between the return liquid and the refrigerant vapor, so that high heat exchange efficiency is obtained here.

    Subsequently, the second and following embodiments will be described with reference to FIG. 3 to 17 are piping configuration diagrams, and the piping shown therein is assumed to be realized in the refrigerator 1 of FIG. Constituent elements common to the first embodiment are used as they are in the description of the first embodiment, and description thereof is omitted.

    A second embodiment of the refrigerator of the present invention is shown in FIG. Here, a heat exchanging part 62 for promoting the evaporation of drain and a heat exchanging part 63 for preventing condensation on the cooling wall are connected in parallel, and this parallel connection structure is connected to the second high temperature side heat exchanger 61 and the circulation pump 64. Connect in series. The circulation pump 64 is also arranged at the most upstream part of the second high temperature side refrigerant circulation circuit 60 here. In the parallel connection structure, a valve 65 is connected in series on the upstream side of the heat exchange unit 62, and a valve 66 is connected in series on the upstream side of the heat exchange unit 63.

    According to the said structure, the flow resistance of the refrigerant | coolant in the location of the heat exchange parts 62 and 63 becomes about half of 1st Embodiment, and the power consumption of the circulation pump 64 can be reduced significantly. Further, since the valves 65 and 66 are combined with the heat exchanging parts 62 and 63, if either the drain evaporation promotion or the condensation prevention of the cooling wall is not required, the unnecessary valve is closed to stop the flow of the refrigerant. be able to. By reducing the load on the circulation pump, the power consumption of the circulation pump 64 can be further reduced.

    If the valve 66 is closed except when necessary to prevent condensation, the surroundings of the doors 14, 15, 16 are not heated longer than necessary. Thereby, the thermal load of the cooling chambers 11, 12, and 13 can be reduced, and power consumption can be suppressed.

    Instead of providing a dedicated valve for each of the heat exchange units 62 and 63, a common three-way valve is provided, and “the refrigerant passes through both of the heat exchange units 62 and 63” by the switching operation of the three-way valve. It is also possible to select three states of “the refrigerant passes only” and “the refrigerant passes only through the heat exchange section 63”. In order to facilitate automatic control, the valve is preferably a solenoid valve.

    Note that the refrigerant flowing through the first high temperature side refrigerant circulation circuit 50 and the second high temperature side refrigerant circulation circuit 60 is gas-liquid two-phase.

    A third embodiment of the refrigerator of the present invention is shown in FIG. In a high humidity environment, drain evaporation must be promoted and condensation on the cooling wall must be prevented without interruption, but the piping structure of the third embodiment is suitable for such a case.

    In the third embodiment, a single type high temperature side heat exchanger 71 is attached to the high temperature part of the Stirling refrigeration engine 30. Like the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61, the high temperature side heat exchanger 71 is provided with a large number of fins so that heat can be efficiently exchanged with the refrigerant. It has become. The high temperature side heat exchanger 71 includes, in order from the upstream side of the refrigerant flow, a circulation pump 64, a heat exchange portion 62 for promoting drain evaporation, a heat exchange portion 63 for preventing condensation on the cooling wall, and heat for heat radiation. The exchanger 52 is connected so as to form a series circuit, and constitutes a high temperature side refrigerant circulation circuit 70.

    When the Stirling refrigerating engine 30 is driven, the high temperature side heat exchanger 71 is heated. When the high temperature side heat exchanger 71 is heated, the refrigerant evaporates, and a gas-liquid two-phase shape in which the gas phase and the liquid phase are mixed is formed. A gas-liquid two-phase refrigerant is sent out to the heat exchanging unit 62 by a circulation pump 64 arranged at the most upstream part of the high temperature side refrigerant circulation circuit 70.

    The gas-liquid two-phase refrigerant flows through the heat exchanging section 62 and transfers heat to the drain pan 26 to promote drain evaporation. The refrigerant then flows through the heat exchanging section 63 and transfers heat to a location in contact with the outside air on the refrigerator wall to keep the temperature at this location at or above the dew point temperature.

    The refrigerant that collects cold heat from the drain in the heat exchange unit 62 and collects cold heat from the housing 10 in the heat exchange unit 63 flows into the heat-dissipating heat exchanger 52 in a state where the gas phase is considerably returned to the liquid phase. To do. Since the blower fan 53 blows air onto the surface of the heat-dissipating heat exchanger 52, the refrigerant is further deprived of heat, liquefaction progresses, and recirculates to the high-temperature side heat exchanger 71 in the form of an almost liquid phase. . And a part evaporates and a gas-liquid two phase is recovered | restored again. In this way, a cycle is repeated in which the refrigerant receives heat from the high temperature portion of the Stirling refrigerating engine 30 and evaporates, condenses and dissipates heat in the heat exchanging portions 62 and 63, and collects the cold. If the operation of the circulation pump 64 is stopped, this cycle is interrupted.

    According to the above configuration, there is an advantage that the piping structure of the high-temperature side refrigerant circulation circuit 70 is simple and the number of assembly steps can be reduced.

    The positions of the heat exchange parts 62 and 63 may be reversed, the cooling wall may be heated first, and then the drain pan 26 may be heated. Note that heat transfer using a gas-liquid two-phase refrigerant is desirable, but heat transfer using a liquid phase-only brine method can also be employed.

    5th Embodiment of this invention refrigerator is shown in FIG. Also in the fourth embodiment, the single high temperature side heat exchanger 71 is attached to the high temperature part of the Stirling refrigerating engine 30. A large number of fins are provided inside the high temperature side heat exchanger 71 so that heat can be efficiently exchanged with the refrigerant. A circulation pump 64 is connected to the downstream side of the high temperature side heat exchanger 71, and a heat dissipation heat exchanger 52 is connected to the upstream side.

    Between the circulation pump 64 and the heat dissipating heat exchanger 52, a heat exchanging portion 62 for promoting drain evaporation and a heat exchanging portion 63 for preventing condensation on the cooling wall are disposed. The heat exchange units 62 and 63 are not connected in series as in the third embodiment, but are connected in parallel as in the second embodiment. This parallel connection structure is connected in series to the high temperature side heat exchanger 71 and the circulation pump 64. In the parallel connection structure, a valve 65 is connected in series on the upstream side of the heat exchange unit 62, and a valve 66 is connected in series on the upstream side of the heat exchange unit 63. In this way, the high temperature side refrigerant circulation circuit 70 is configured.

    When the Stirling refrigerating engine 30 is driven, the high temperature side heat exchanger 71 is heated. When the high temperature side heat exchanger 71 is heated, a part of the internal refrigerant evaporates, and the refrigerant becomes a gas-liquid two-phase form. The gas-liquid two-phase refrigerant is sent out to the heat exchanging units 62 and 63 by the circulation pump 64 arranged at the most upstream part of the high temperature side refrigerant circulation circuit 70.

    The refrigerant is diverted and flows through the heat exchanging parts 62 and 63, and heat is transmitted to the drain pan 26 to accelerate the evaporation of the drain. Further, the heat is transmitted to a location in contact with the outside air on the refrigerator wall, and the temperature of this location is higher than the dew point temperature. Keep on.

    The refrigerant that collects cold heat from the drain in the heat exchange unit 62 and collects cold heat from the housing 10 in the heat exchange unit 63 flows into the heat-dissipating heat exchanger 52 in a state where the gas phase is considerably returned to the liquid phase. To do. Since the blower fan 53 blows air onto the surface of the heat-dissipating heat exchanger 52, the refrigerant is further deprived of heat, liquefaction progresses, and recirculates to the high-temperature side heat exchanger 71 in the form of an almost liquid phase. . And a part evaporates and a gas-liquid two phase is recovered | restored again. In this way, a cycle is repeated in which the refrigerant receives heat from the high temperature portion of the Stirling refrigerating engine 30 and evaporates, condenses and dissipates heat in the heat exchanging portions 62 and 63, and collects the cold heat. If the operation of the circulation pump 64 is stopped, this cycle is interrupted.

    A fifth embodiment of the refrigerator of the present invention is shown in FIG. As in the second embodiment, a heat exchanging portion 62 for promoting drain evaporation and a heat exchanging portion 63 for preventing condensation on the refrigerator wall are connected in parallel, and this parallel connection structure is used as a second high temperature side heat exchanger. 61 and the circulation pump 64 are connected in series. In the parallel connection structure, a valve 65 is connected in series on the upstream side of the heat exchange unit 62, and a valve 66 is connected in series on the upstream side of the heat exchange unit 63.

    In the fifth embodiment, the defrosting refrigerant circulation circuit 80 is connected in parallel to the parallel connection structure of the heat exchange units 62 and 63. The defrosting refrigerant circulation circuit 80 includes a defrosting heat exchanger 81 and valves 82 and 83 connected to the upstream side and the downstream side thereof. The defrosting heat exchanger 81 transfers heat to the internal cooling heat exchanger 42 by heat conduction or convection. Forced convection by a blower fan may be generated between the defrosting heat exchanger 81 and the internal cooling heat exchanger 42. It is also possible to configure a defrosting heat exchanger 81 by partitioning a part of the internal cooling heat exchanger 42.

    Cooling of the cooling chambers 11, 12, and 13 is performed with the valves 65 and 66 opened and the valves 82 and 83 closed. When the Stirling refrigeration engine 30 is driven, the low temperature side heat exchanger 41 is deprived of heat, and the internal refrigerant flows into the internal cooling heat exchanger 42 through the low temperature side refrigerant circulation circuit 40 in a condensed state.

    The refrigerant that has flowed into the internal cooling heat exchanger 42 is evaporated by the heat of the air passing through the internal cooling heat exchanger 42, and the surface temperature of the internal cooling heat exchanger 42 is lowered. The air passing through the internal cooling heat exchanger 42 is deprived of heat and becomes cold air, blown out from the cold air outlet 21 of the duct 20 to the cooling chambers 11, 12, 13, and lowers the temperature of the cooling chambers 11, 12, 13. Thereafter, the air flows back to the internal cooling heat exchanger 42 through a duct (not shown).

    The heat generated when the Stirling refrigerating engine 30 performs work, and the heat recovered from the inside of the low temperature portion is heat that should be radiated from the high temperature portion. The first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61 are heated by this heat.

    When the first high temperature side heat exchanger 51 is heated, a part of the internal refrigerant evaporates, and the refrigerant flows into the heat dissipation heat exchanger 52 in a gas-liquid two-phase form. The blower fan 53 blows air onto the surface of the heat-dissipating heat exchanger 52, and the gas-phase refrigerant is deprived of heat and condensed. The refrigerant that has condensed to a liquid phase is refluxed to the first high temperature side heat exchanger 51 and evaporated again. In this way, the cycle in which the refrigerant receives heat from the high temperature portion of the Stirling refrigeration engine 30 and evaporates and transmits it to the cooling air by the heat-dissipating heat exchanger 52 to condense is repeated.

    When the second high temperature side heat exchanger 61 is heated, a part of the internal refrigerant evaporates, and the refrigerant is in a gas-liquid two-phase form. The gas-liquid two-phase refrigerant is sent out to the heat exchanging units 62 and 63 by the circulation pump 64 arranged at the most upstream part of the second high temperature side refrigerant circulation circuit 60. The refrigerant is diverted and flows through the heat exchanging parts 62 and 63, and heat is transmitted to the drain pan 26 to accelerate the evaporation of the drain. Further, the heat is transmitted to a location in contact with the outside air on the refrigerator wall, and the temperature of this location is higher than the dew point temperature. Keep on.

    The refrigerant that collects the cold heat from the drain in the heat exchange unit 62 and collects the cold heat from the housing 10 in the heat exchange unit 63 is a gas phase, but the liquefaction proceeds, and the second high temperature side in the form of a substantially liquid phase. Reflux to heat exchanger 61. And a part evaporates and a gas-liquid two phase is recovered | restored again. In this way, a cycle is repeated in which the refrigerant receives heat from the high temperature portion of the Stirling refrigerating engine 30 and evaporates, condenses and dissipates heat in the heat exchanging portions 62 and 63, and collects the cold heat. Since the valves 82 and 83 are closed, the heat of the refrigerant is not transmitted to the internal cooling heat exchanger 42. If the operation of the circulation pump 64 is stopped, this cycle is interrupted.

    When the surface temperature of the internal cooling heat exchanger 42 decreases, the air passing through the internal cooling heat exchanger 42 is deprived of heat and becomes cold. At the same time, moisture contained in the air, that is, moisture that has entered the cooling chambers 11, 12, and 13 and moisture that has been taken away from the stored food in the cooling chamber adheres to the internal cooling heat exchanger 42 as frost. When the frost is formed, the heat exchange efficiency between the internal cooling heat exchanger 42 and the air is lowered due to the heat insulating action of the frost. Moreover, the clearance gap between the fins of the internal-cooling heat exchanger 42 is narrowed by frost, and the air flow rate is reduced. Thereby, the cooling capacity is further reduced.

    Therefore, the valves 82 and 83 are opened at an appropriate timing, and the refrigerant discharged from the second high temperature side heat exchanger 61 is caused to flow to the defrosting heat exchanger 81. Then, the heat of the refrigerant is transmitted to the internal cooling heat exchanger 42, and the frost adhering to the internal cooling heat exchanger 42 is melted. The melted frost flows into the drain pan 26 as a drain.

    The cold heat of the internal cooling heat exchanger 42, mainly the cold heat of frost, is recovered by the refrigerant. The refrigerant whose temperature is lowered by recovering the cold heat and the liquefaction has progressed returns to the second high temperature side heat exchanger 61 and becomes a gas-liquid two phase again. In order to increase the efficiency of defrosting and shorten the defrosting time, it is preferable to close the valves 65 and 66 during the defrosting period so that the refrigerant flows in the defrosting heat exchanger 81 in a concentrated manner.

    According to this configuration, it is possible to defrost the inside-cooling heat exchanger 42 without providing an electric heater for defrosting. Further, since the cold heat of the frost is recovered to cool the high temperature portion of the Stirling refrigerating engine 30, the heat load of the heat dissipation system is reduced, and the heat dissipation efficiency of the entire heat dissipation system is improved.

    Since the first high temperature side refrigerant circulation circuit 50 is a loop thermosyphon, heat can be extracted from the first high temperature side heat exchanger 51 without using artificial energy. On the other hand, in the second high temperature side refrigerant circulation circuit 60, the refrigerant is sent by the circulation pump 64, and at least one of the heat of the high temperature part is promoted to evaporate the drain, the condensation of the cooling wall is prevented, and the defrosting of the heat exchanger for cooling in the warehouse. Can be used reliably.

    A defrosting heat exchanger 81 may be connected in series to the parallel connection structure of the heat exchange units 62 and 63. In this case, the valves 82 and 83 are unnecessary. If the circulation pump 64 is operated with the valves 65 and 66 open, drain evaporation promotion, cooling wall heating, and defrosting are performed simultaneously. When the valve 65 is closed, the drain evaporation is stopped, and when the valve 66 is closed, the heating of the cooling wall is stopped. If the circulation pump 64 is stopped, the operations of the heat exchangers 62 and 63 and the defrosting heat exchanger 81 are all stopped.

    A sixth embodiment of the refrigerator of the present invention is shown in FIG. The sixth embodiment is obtained by adding the following elements to the fifth embodiment. That is, the heat exchanger type heat storage unit 90 is provided between the parallel connection structure of the heat exchange unit 62, the heat exchange unit 63, and the defrosting heat exchanger 81 and the second high temperature side heat exchanger 61.

    When the Stirling refrigeration engine 30 is driven with the valves 65 and 66 open and the valves 82 and 83 closed, the low temperature side heat exchanger 41 is deprived of heat, and the internal refrigerant is condensed and the internal cooling heat exchanger. It flows into 42. The refrigerant flowing into the interior cooling heat exchanger 42 evaporates and lowers the surface temperature of the interior cooling heat exchanger 42. Thereby, cooling of the cooling chambers 11, 12, and 13 is performed.

    On the other hand, the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61 are heated. When the first high temperature side heat exchanger 51 is heated, a part of the internal refrigerant evaporates, and the refrigerant flows into the heat dissipation heat exchanger 52 in a gas-liquid two-phase form. The blower fan 53 blows air onto the surface of the heat-dissipating heat exchanger 52, and the gas-phase refrigerant is deprived of heat and condensed. The refrigerant that has condensed to a liquid phase is refluxed to the first high temperature side heat exchanger 51 and evaporated again. In this way, the cycle in which the refrigerant receives heat from the high temperature portion of the Stirling refrigeration engine 30 and evaporates and transmits it to the cooling air by the heat-dissipating heat exchanger 52 to condense is repeated.

    When the second high temperature side heat exchanger 61 is heated, a part of the internal refrigerant evaporates, and the refrigerant becomes a gas-liquid two-phase form. The gas-liquid two-phase refrigerant is sent out to the heat exchanging units 62 and 63 by the circulation pump 64 arranged at the most upstream part of the second high temperature side refrigerant circulation circuit 60. The refrigerant is diverted and flows through the heat exchanging parts 62 and 63, and heat is transmitted to the drain pan 26 to accelerate the evaporation of the drain. Further, the heat is transmitted to a location in contact with the outside air on the refrigerator wall, and the temperature of this location exceeds the dew point temperature. Keep on.

    The refrigerant that has exited the heat exchange units 62 and 63 passes through the heat storage unit 90. The residual heat after radiating heat at the heat exchange units 62 and 63 is accumulated in the heat storage unit 90. The refrigerant that has given residual heat to the heat storage unit 90 is in a gas phase, but liquefaction proceeds, and is returned to the second high temperature side heat exchanger 61 in a substantially liquid phase form. And a part evaporates and a gas-liquid two phase is recovered | restored again. In this way, the cycle in which the refrigerant receives heat at the high temperature part and evaporates, condenses and dissipates heat at the heat exchange parts 62 and 63 and the heat storage part 90, and collects the cold heat is repeated. Since the valves 82 and 83 are closed, the heat of the refrigerant is not transmitted to the internal cooling heat exchanger 42. If the operation of the circulation pump 64 is stopped, this cycle is interrupted.

    When defrosting the internal-cooling heat exchanger 42, the valves 82 and 83 are opened, and the refrigerant that has come out of the second high temperature side heat exchanger 61 is caused to flow to the defrost heat exchanger 81. Then, the heat of the refrigerant is transmitted to the internal cooling heat exchanger 42, and the frost adhering to the internal cooling heat exchanger 42 is melted. The melted frost flows into the drain pan 26 as a drain.

    The cold heat of the internal cooling heat exchanger 42, mainly the cold heat of frost, is recovered by the refrigerant. The refrigerant whose temperature has decreased by collecting the cold heat exchanges heat with the heat storage unit 90 when passing through the heat storage unit 90. After releasing the cold heat and increasing the temperature by receiving warm heat from the heat storage unit 90, the refrigerant returns to the second high temperature side heat exchanger 61 and again becomes a gas-liquid two phase. In order to increase the efficiency of defrosting and shorten the defrosting time, the valves 65 and 66 are closed during the defrosting period so that the refrigerant flows in the defrosting heat exchanger 81 in a concentrated manner.

    Thus, cold heat from frost is accumulated in the heat storage unit 90 during the defrosting process. When the defrosting process is completed and the normal operation is resumed, the heat storage unit 90 transmits cold heat to the passing refrigerant, and cools the high temperature portion of the Stirling refrigerating engine 30. Instead, the heat storage unit 90 accumulates heat from the high temperature part and prepares for the next defrosting step.

    According to this configuration, it is possible to defrost the inside-cooling heat exchanger 42 without providing an electric heater for defrosting. Even if the Stirling refrigerating engine 30 is stopped, as long as the circulation pump 64 is driven, the refrigerant can be heated with the warm heat stored in the heat storage section 90 to perform defrosting.

    Similarly to the fifth embodiment, the cold heat of the frost is recovered to cool the high temperature part of the Stirling refrigeration engine 30, so that the heat load of the heat dissipation system is reduced and the heat dissipation efficiency of the entire heat dissipation system is improved. As a result, the operating COP of the Stirling refrigerating engine 30 is improved, and the power consumption can be reduced.

    A defrosting heat exchanger 81 may be connected in series to the parallel connection structure of the heat exchange units 62 and 63. In this case, the valves 82 and 83 are unnecessary. If the circulation pump 64 is operated with the valves 65 and 66 open, drain evaporation promotion, cooling wall heating, and defrosting are performed simultaneously. When the valve 65 is closed, the drain evaporation is stopped, and when the valve 66 is closed, the heating of the cooling wall is stopped. If the circulation pump 64 is stopped, the operations of the heat exchangers 62 and 63 and the defrosting heat exchanger 81 are all stopped.

    FIG. 8 shows a seventh embodiment of the present refrigerator. The seventh embodiment is different from the second embodiment in that the high temperature side heat exchanger is a single type. That is, in this embodiment, the single type high temperature side heat exchanger 71 is attached to the high temperature part of the Stirling refrigerating engine 30. A large number of fins are provided inside the high temperature side heat exchanger 71 so that heat can be efficiently exchanged with the refrigerant.

    A first high temperature side refrigerant circulation circuit 50 and a second high temperature side refrigerant circulation circuit 60 are configured to include the high temperature side heat exchanger 71. That is, the high temperature side heat exchanger 71 is a high temperature side heat exchanger common to both the first high temperature side refrigerant circulation circuit 50 and the second high temperature side refrigerant circulation circuit 60, and the common high temperature side heat exchanger 71 includes the first high temperature side heat exchanger 71. The high temperature side refrigerant circulation circuit 50 and the second high temperature side refrigerant circulation circuit 60 are connected to each other in parallel.

    FIG. 9 shows an eighth embodiment of the present refrigerator. In a high humidity environment, drain evaporation must be promoted and condensation on the cooling wall must be prevented without any breaks. The piping structure of the eighth embodiment is suitable for such a case.

    The eighth embodiment is different from the first embodiment in that the high temperature side heat exchanger is a single type. That is, in this embodiment, the single type high temperature side heat exchanger 71 is attached to the high temperature part of the Stirling refrigerating engine 30. A large number of fins are provided inside the high temperature side heat exchanger 71 so that heat can be efficiently exchanged with the refrigerant.

    A first high temperature side refrigerant circulation circuit 50 and a second high temperature side refrigerant circulation circuit 60 are configured to include the high temperature side heat exchanger 71. That is, the high temperature side heat exchanger 71 is a high temperature side heat exchanger common to both the first high temperature side refrigerant circulation circuit 50 and the second high temperature side refrigerant circulation circuit 60, and the common high temperature side heat exchanger 71 includes the first high temperature side heat exchanger 71. The high temperature side refrigerant circulation circuit 50 and the second high temperature side refrigerant circulation circuit 60 are connected to each other in parallel.

    According to the above configuration, there is an advantage that the piping structure of the high-temperature side refrigerant circulation circuit 60 is simple and the number of assembly steps can be reduced.

    The positions of the heat exchange parts 62 and 63 may be reversed, the cooling wall may be heated first, and then the drain pan 26 may be heated.

    10th Embodiment of this invention refrigerator is shown in FIG. The ninth embodiment has substantially the same configuration as that of the eighth embodiment, but differs from the eighth embodiment in the following points. That is, in the case of the eighth embodiment, the reflux refrigerant pipe that serves to recirculate the refrigerant to the high temperature side heat exchanger 71 in the first high temperature side refrigerant circulation circuit 50 is connected to the high temperature side heat exchanger 71. In the ninth embodiment, the reflux refrigerant pipe is connected to the suction side of the circulation pump 64.

    According to this configuration, the refrigerant flowing from the high temperature side heat exchanger 71 into the heat radiation heat exchanger 52 in the form of natural circulation directly enters the high temperature side heat exchanger 71 when returning from the heat radiation heat exchanger 52. Instead, the refrigerant flows through the second high-temperature refrigerant circulation circuit 60. For this reason, the heat amount of the refrigerant flowing out from the high temperature side heat exchanger 71 to the second high temperature side refrigerant circulation circuit 60 is added to the heat amount of the refrigerant having the saturation temperature recirculated from the heat radiating heat exchanger 52, and the second high temperature side The total heat quantity of the refrigerant flowing through the refrigerant circulation circuit 60 increases. As a result, the amount of heat given to the heat exchanging portion 62 for promoting drain evaporation and the heat exchanging portion 63 for preventing condensation on the cooling wall increases, and the utilization efficiency of the heat generated by the Stirling refrigeration engine 30 can be increased. .

    FIG. 11 shows a tenth embodiment of the present invention refrigerator. The tenth embodiment has the same configuration as the fifth embodiment, but differs from the fifth embodiment in that the high-temperature side heat exchanger is a single type. With this configuration, similarly to the fifth embodiment, the inside cooling heat exchanger 42 can be defrosted without providing an electric heater for defrosting. Further, since the cold heat of the frost is recovered to cool the high temperature portion of the Stirling refrigerating engine 30, the heat load of the heat dissipation system is reduced, and the heat dissipation efficiency of the entire heat dissipation system is improved.

    An eleventh embodiment of the refrigerator of the present invention is shown in FIG. The eleventh embodiment has the same configuration as that of the sixth embodiment, but differs from the sixth embodiment in that the high temperature side heat exchanger is a single type. With this configuration, as in the sixth embodiment, the inside cooling heat exchanger 42 can be defrosted without providing an electric heater for defrosting, and even if the Stirling refrigeration engine 30 is stopped, the circulation pump As long as 64 is driven, defrosting can be performed by heating the refrigerant with the warm heat stored in the heat storage section 90.

    FIG. 13 shows a twelfth embodiment of the present refrigerator. In the twelfth embodiment, the configuration of the second embodiment is changed as follows. That is, in the case of the second embodiment, the first high temperature side heat exchanger 51 is dedicated to the first high temperature side refrigerant circulation circuit 50, and the second high temperature side heat exchanger 61 is dedicated to the second high temperature side refrigerant circulation circuit 60. It was. In the twelfth embodiment, both the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61 are commonly used in the first high temperature side refrigerant circulation circuit 50 and the second high temperature side refrigerant circulation circuit 60.

    As shown in FIG. 13, the refrigerant piping of the first high temperature side refrigerant circulation circuit 50 comes out in parallel from both the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61 and merges in the middle to dissipate heat. The heat exchanger 52 is entered. The refrigerant piping that exits the heat-dissipating heat exchanger 52 branches in the middle, returns in parallel to the first high-temperature side heat exchanger 51 and the second high-temperature side heat exchanger 61.

    The refrigerant piping of the second high-temperature side refrigerant circulation circuit 60 exits in parallel from both the first high-temperature side heat exchanger 51 and the second high-temperature side heat exchanger 61, joins in the middle, and enters the circulation pump 64. The refrigerant piping exiting the parallel connection structure of the heat exchanging portion 62 for promoting evaporation of the drain and the heat exchanging portion 63 for preventing condensation on the cooling wall branches in the middle, and in parallel, the first high temperature side heat exchange Return to the vessel 51 and the second high temperature side heat exchanger 61.

    In other words, the first high temperature side refrigerant circulation circuit 50 and the second high temperature side refrigerant circulation circuit 60 are respectively connected to the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61. They are connected to each other in parallel.

    With the above configuration, the refrigerant is supplied from both the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61 to the first high temperature side refrigerant circulation circuit 50 and the second high temperature side refrigerant circulation circuit 60. become. In addition, the refrigerant flows back from both the first high temperature side refrigerant circulation circuit 50 and the second high temperature side refrigerant circulation circuit 60 to both the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61.

    According to this configuration, the first high temperature side refrigerant circulation circuit 50 and the second high temperature side refrigerant circulation circuit 60 are parallel to each other with respect to the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61, respectively. Since they are connected, a plurality of high-temperature side refrigerant circulation circuits are secured regardless of which of the first high-temperature side heat exchanger 51 and the second high-temperature side heat exchanger 61 is taken up. For this reason, it is easy to avoid a situation in which the circuit becomes unusable and the refrigerant circulation stops, and as a result, the Stirling refrigerating engine 30 is damaged due to poor heat dissipation.

    In addition, both the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61 are responsible for supplying and refluxing the refrigerant to the first high temperature side refrigerant circulation circuit 50 and the second high temperature side refrigerant circulation circuit 60. Both the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61 can be involved in the supply of heat to the outside and the recovery of cold from the outside.

    FIG. 14 shows a thirteenth embodiment of the present refrigerator. In the thirteenth embodiment, the configuration of the eighth embodiment is changed as follows. That is, in the eighth embodiment, the single type high temperature side heat exchanger 71 is used, but in the thirteenth embodiment, a split type high temperature side heat exchanger, that is, the first high temperature side heat exchanger 51 and the second high temperature side heat is used. An exchanger 61 is used.

    As shown in FIG. 14, the refrigerant piping of the first high temperature side refrigerant circulation circuit 50 comes out in parallel from both the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61, and merges in the middle to dissipate heat. The heat exchanger 52 is entered. The refrigerant piping that exits the heat-dissipating heat exchanger 52 branches in the middle, returns in parallel to the first high-temperature side heat exchanger 51 and the second high-temperature side heat exchanger 61.

    The refrigerant piping of the second high-temperature side refrigerant circulation circuit 60 exits in parallel from both the first high-temperature side heat exchanger 51 and the second high-temperature side heat exchanger 61, joins in the middle, and enters the circulation pump 64. After passing through the heat exchange section 62 for promoting drain evaporation, the refrigerant pipe exiting the heat exchange section 63 for preventing condensation on the refrigerator wall branches in the middle, and in parallel, the first high temperature side heat exchanger 51 and return to the second high temperature side heat exchanger 61.

    In other words, the first high temperature side refrigerant circulation circuit 50 and the second high temperature side refrigerant circulation circuit 60 are respectively connected to the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61. They are connected to each other in parallel.

    With the above configuration, the refrigerant is supplied from both the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61 to the first high temperature side refrigerant circulation circuit 50 and the second high temperature side refrigerant circulation circuit 60. become. In addition, the refrigerant flows back from both the first high temperature side refrigerant circulation circuit 50 and the second high temperature side refrigerant circulation circuit 60 to both the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61.

    FIG. 15 shows a fourteenth embodiment of the present invention refrigerator. In the fourteenth embodiment, the configuration of the ninth embodiment is changed as follows. That is, in the ninth embodiment, the single type high temperature side heat exchanger 71 is used, but in the thirteenth embodiment, a split type high temperature side heat exchanger, that is, the first high temperature side heat exchanger 51 and the second high temperature side heat are used. An exchanger 61 is used.

    As shown in FIG. 15, the refrigerant piping of the first high temperature side refrigerant circulation circuit 50 comes out in parallel from both the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61 and merges in the middle to dissipate heat. The heat exchanger 52 is entered. The reflux refrigerant pipe exiting the heat dissipation heat exchanger 52 is connected to the suction side of the circulation pump 64.

    The refrigerant piping of the second high-temperature side refrigerant circulation circuit 60 exits in parallel from both the first high-temperature side heat exchanger 51 and the second high-temperature side heat exchanger 61, joins in the middle, and enters the circulation pump 64. After passing through the heat exchange section 62 for promoting drain evaporation, the refrigerant pipe exiting the heat exchange section 63 for preventing condensation on the refrigerator wall branches in the middle, and in parallel, the first high temperature side heat exchanger 51 and return to the second high temperature side heat exchanger 61.

    Of course, when the first high temperature side refrigerant circulation circuit 50 is blocked, the second high temperature side refrigerant circulation circuit 60 can continue the refrigerant circulation of the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61. On the contrary, even when the circulation pump 64 fails and the refrigerant is no longer delayed, the refrigerant circulation in the first high temperature side refrigerant pipe 50 is performed by the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger. It continues in the form which backflows the refrigerant | coolant piping which goes to the circulation pump 64 from 61. FIG. For this reason, it is easy to avoid a situation in which the circuit becomes unusable and the refrigerant circulation stops, and as a result, the Stirling refrigerating engine 30 is damaged due to poor heat dissipation.

    A fifteenth embodiment of the refrigerator of the present invention is shown in FIG. In the fifteenth embodiment, similarly to the fifth and tenth embodiments, the defrosting refrigerant circulation circuit 80 is connected in parallel to the parallel connection structure of the heat exchange units 62 and 63. The defrosting refrigerant circulation circuit 80 includes a defrosting heat exchanger 81 and valves 82 and 83 connected to the upstream side and the downstream side thereof. The defrosting heat exchanger 81 transfers heat to the internal cooling heat exchanger 42 by heat conduction or convection, or by forced convection by a blower fan.

    According to this configuration, it is possible to defrost the inside-cooling heat exchanger 42 without providing an electric heater for defrosting. Further, since the cold heat of the frost is recovered to cool the high temperature portion of the Stirling refrigerating engine 30, the heat load of the heat dissipation system is reduced, and the heat dissipation efficiency of the entire heat dissipation system is improved. As a result, the operating COP of the Stirling refrigerating engine 30 is improved, and the power consumption can be reduced.

    A sixteenth embodiment of the refrigerator of the present invention is shown in FIG. In the sixteenth embodiment, the following elements are added to the fifteenth embodiment. That is, between the parallel connection structure of the heat exchange unit 62, the heat exchange unit 63, and the defrosting heat exchanger 81 and the first high temperature side heat exchanger 51 and the second high temperature side heat exchanger 61, the sixth embodiment. As in the eleventh embodiment, a heat exchanger type heat storage unit 90 is provided.

    According to this configuration, the inside cooling heat exchanger 42 can be defrosted without providing an electric heater for defrosting, and even if the Stirling refrigeration engine 30 is stopped, the circulation pump 64 can be driven. If it carries out, defrosting can be performed by heating a refrigerant | coolant with the warm heat stored in the thermal storage part 90.

    As mentioned above, although each embodiment of the present invention was described, the scope of the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention.

    INDUSTRIAL APPLICABILITY The present invention is a household or commercial refrigerator, and can be used in general with a Stirling refrigerator as a cold heat source.

Cross section of refrigerator Piping configuration diagram showing the first embodiment of the refrigerator of the present invention Piping configuration diagram showing a second embodiment of the refrigerator of the present invention Piping configuration diagram showing a third embodiment of the present invention refrigerator Piping configuration diagram showing a fourth embodiment of the refrigerator of the present invention Piping configuration diagram showing a fifth embodiment of the present invention refrigerator Piping configuration diagram showing a sixth embodiment of the refrigerator of the present invention Piping configuration diagram showing a seventh embodiment of the present invention refrigerator Piping configuration diagram showing the eighth embodiment of the refrigerator of the present invention Piping configuration diagram showing a ninth embodiment of the present invention refrigerator Piping configuration diagram showing a tenth embodiment of the present invention refrigerator Piping configuration diagram showing an eleventh embodiment of the refrigerator of the present invention Piping configuration diagram showing the twelfth embodiment of the present invention refrigerator Piping configuration diagram showing a thirteenth embodiment of the refrigerator of the present invention Piping configuration diagram showing a fourteenth embodiment of the present invention refrigerator Piping configuration diagram showing a fifteenth embodiment of the present invention refrigerator Piping configuration diagram showing a sixteenth embodiment of the present invention refrigerator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling chamber 10 Housing 11, 12, 13 Cooling chamber 14, 15, 16 Thermal insulation door 17 Gasket 26 Drain pan 30 Stirling refrigeration engine 40 Low temperature side refrigerant circulation circuit 41 Low temperature side heat exchanger 42 Heat exchanger for cooling in a cabinet 50 1st High temperature side refrigerant circulation circuit 51 First high temperature side heat exchanger 52 Heat dissipation heat exchanger 53 Blower fan 60 Second high temperature side refrigerant circulation circuit 61 Second high temperature side heat exchanger 62, 63 Heat exchange unit 64 Circulation pumps 65, 66 Valve 70 High-temperature side refrigerant circulation circuit 71 High-temperature side heat exchanger 80 Defrosting refrigerant circulation circuit 81 Defrosting heat exchanger 82, 83 Valve 90 Heat storage section

Claims (13)

In a refrigerator that cools the interior with a Stirling refrigeration engine,
The heat of the high temperature part of the Stirling refrigeration engine is transmitted to the gas-liquid two-phase refrigerant, and is used for at least one of promoting drain evaporation, preventing condensation on the cooling wall, and defrosting the heat exchanger for cooling in the refrigerator. A refrigerator characterized by. In a refrigerator that cools the interior with a Stirling refrigeration engine,
A first high-temperature side refrigerant circulation circuit that dissipates heat from the high-temperature portion of the Stirling refrigeration engine to the outside of the chamber, promotes evaporation of drainage of heat from the high-temperature portion, prevents condensation on the cooling wall, and heat exchanger for cooling in the chamber And a second high-temperature side refrigerant circulation circuit used for at least one of the defrosting.   The refrigerator according to claim 2, wherein the first high temperature side refrigerant circulation circuit and the second high temperature side refrigerant circulation circuit are made independent of each other.   The refrigerator according to claim 2 or 3, wherein the first high temperature side refrigerant circulation circuit circulates the refrigerant by natural circulation, and the second high temperature side refrigerant circulation circuit circulates the refrigerant by forced circulation. In a refrigerator that cools the interior with a Stirling refrigeration engine,
Formed between the high temperature side heat exchanger provided in the high temperature part of the Stirling refrigeration engine, the heat exchanger for heat dissipation for radiating heat to the outside environment, and the high temperature side heat exchanger and the heat exchanger for heat dissipation At least one of the first high-temperature side refrigerant circulation circuit, which is a looped thermosyphon, and the heat of the high-temperature portion for promoting the evaporation of drain, preventing condensation on the cooling wall, and defrosting the heat exchanger for cooling in the refrigerator A cooling room comprising: a second high temperature side refrigerant circulation circuit used for the above, and a circulation pump for sending the refrigerant in the high temperature side heat exchanger to the second high temperature side refrigerant circulation circuit. In a refrigerator that cools the interior with a Stirling refrigeration engine,
A first high-temperature side refrigerant circulation circuit that dissipates heat from the high-temperature portion of the Stirling refrigeration engine to the outside of the chamber, promotes evaporation of drainage of heat from the high-temperature portion, prevents condensation on the cooling wall, and heat exchanger for cooling in the chamber Forming a second high temperature side refrigerant circulation circuit to be used for at least one of the defrosting, and providing the first high temperature side refrigerant circulation circuit and the second high temperature side refrigerant circulation circuit in the high temperature section. A refrigerator characterized by being connected in parallel to the side heat exchanger.   A plurality of the high temperature side heat exchangers are provided, and the first high temperature side refrigerant circulation circuit and the second high temperature side refrigerant circulation circuit are connected in parallel to each of the plurality of high temperature side heat exchangers. The refrigerator according to claim 6 characterized by things.   The refrigerator according to claim 5, wherein a reflux refrigerant pipe of the first high temperature side refrigerant circulation circuit is connected to a suction side of the circulation pump.   9. The refrigerant according to claim 2, wherein the refrigerant is used in a gas-liquid two-phase form in one or both of the first high temperature side refrigerant circulation circuit and the second high temperature side refrigerant circulation circuit. Refrigerator. In a refrigerator that cools the interior with a Stirling refrigeration engine,
A heat exchanging part provided for promoting drain evaporation and a heat exchanging part provided for preventing condensation on the refrigerator wall are connected in parallel, and this parallel connection structure is used for heat provided in the high temperature part of the Stirling refrigeration engine. A refrigerator having a high-temperature side refrigerant circulation circuit connected in series to an exchanger. In a refrigerator that cools the interior with a Stirling refrigeration engine,
The heat exchanger provided in the high temperature part of the Stirling refrigeration engine, the heat exchange part provided for promoting the evaporation of drain, and the heat exchange part provided for preventing condensation on the cooling wall are connected in series. A refrigerator having a side refrigerant circulation circuit.   A low temperature side refrigerant circulation circuit including a heat exchanger provided in a low temperature part of the Stirling refrigeration engine and an internal cooling heat exchanger is formed, and a defrosting heat exchange part for the internal cooling heat exchanger The high-temperature side refrigerant circulation circuit including the heat exchanger for defrosting and the heat exchanger provided in the high-temperature part of the Stirling refrigeration engine is formed. The refrigerator as described in.   The refrigerator according to claim 12, wherein a heat storage unit is provided in a high-temperature side refrigerant circulation circuit including the heat exchange unit for defrosting and a heat exchanger provided in a high-temperature part of the Stirling refrigeration engine.

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