JP2002062021A - Stirling refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a Stirling refrigerator advantageous for energy saving in which the size of a Stirling unit is reduced and frosting to the opening of a refrigerator is prevented. SOLUTION: The Stirling refrigerator 1 comprises a Stirling refrigerating machine 8 comprising a heat absorption heat exchanger 12 fixed to a cold head 11 and a heat radiation heat exchanger 10 fixed to a warm head 9 and producing cold heat at the cold head 9 through reverse Stirling cycle, and a drain pan 15 for recovering drain water in the refrigerator or from the heat absorption heat exchanger 12. The warm head or the heat radiation heat exchanger 10 is coupled with one end of an anti-frost heat pipe 17 having the other end being lead to the opening side of the refrigerator 1. When the Stirling refrigerating machine 8 is driven, waste heat discharged from the warm head is carried through the anti-frost heat pipe 17 in order to heat the opening side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator having a Stirling refrigerator.

[0002]

2. Description of the Related Art At present, in household refrigerators and the like, a vapor compression refrigeration cycle for circulating a CFC-based refrigerant is generally used. However, it has been pointed out that this fluorocarbon-based refrigerant, when released into the atmosphere, reaches the stratosphere without being decomposed and destroys the ozone layer. For this reason, the production and use of CFC-based refrigerants and alternative refrigerants such as 134a which have been widely used in the past tend to be regulated worldwide.

[0003] Against this background, the characteristics of a thermodynamic cycle known as a reverse Stirling cycle have been reviewed, and in recent years, a Stirling refrigeration system using the same has attracted attention. However, when looking at practical examples of Stirling refrigerators, most of them are for relatively small refrigeration systems with refrigeration capacities of several tens of watts or less, and are of the order of several hundred watts, which are expected to be most demanded for home or business use. The Stirling refrigerator having the refrigerating capacity of the above has not yet reached the stage of practical use.

A conventional Stirling cooler disclosed in Japanese Patent Publication No. 2714155 will be described below. A low-temperature side heat exchanger is located in a cool air passage formed at the back of the freezer compartment of the refrigerator for circulation of cool air,
A Stirling refrigerator is provided so that the high-temperature side heat exchanger is connected to the metal surface of the refrigerator body.

When the Stirling refrigerator is driven, cold heat is generated from the low-temperature side heat exchanger, and the inside of the refrigerator is cooled by cold air flowing through the cool air passage. Further, an air cooling fan is provided in a V-shaped heat radiation path formed at the back of the cold air passage so that heat accumulated in the high-temperature side heat exchanger is actively released to the outside. Further, a part of the waste heat of the high-temperature side heat exchanger is released to the outside even through the metal surface portion of the refrigerator body, so that the load on the high-temperature side heat exchanger is reduced, and thus the radiation efficiency is improved. I do.

[0006]

This conventional cooling box is a system for cooling by sending cold heat as sensible heat directly into the box through air. Therefore, in order to obtain the same level of performance as the conventional vapor compression type refrigeration cycle using sensible heat, the heat exchanger becomes large and very bulky. Therefore, in this conventional configuration, it has been difficult to reduce the size and cost of the system required for general home use.

[0007] The first bottleneck is the downsizing of the refrigeration system. In particular, in order to secure a storage space equivalent to that of a conventional vapor compression refrigeration cycle, it is essential to reduce the size of the Stirling refrigerator itself. In recent years, research on miniaturization of Stirling refrigerators has been actively pursued, and with the miniaturization of Stirling refrigerators, the radiator and heat absorber have become smaller, and the space inside the cylinder filled with a working medium such as helium has been reduced. Has also been reduced.

In order to efficiently obtain a large amount of cold heat from such a miniaturized Stirling refrigerator, it is necessary to increase the heat exchange efficiency of the heat exchanger attached to the heat radiating portion and the heat absorbing portion. Even if the refrigerator is downsized, the heat exchanger becomes large, and there is a problem that the whole apparatus is not very small.

Therefore, it is necessary to reduce the size of the heat exchanger while maintaining the heat exchange efficiency of the heat exchanger as well as to reduce the size of the Stirling refrigerator itself. Is very important to get

By the way, in a medium-sized household refrigerator using a conventional vapor compression refrigeration cycle, a heat radiation pipe including a condenser and having a length of about 20 m is meanderingly routed. The heat exchange with the external space is performed using both the sensible heat and the latent heat of condensation of the refrigerant flowing in the pipe.

On the other hand, in the forced air cooling system proposed in the above-mentioned conventional cooling cabinet, the size of the heat radiating heat exchanger is considered to be very large, and sufficient heat radiation from the heat radiating heat exchanger is promoted. Therefore, it is necessary to increase the amount of cooling air sent to the heat exchanger for heat radiation. However, the power consumption of the blower fan also increases due to the increase in the amount of cooling air, and the efficiency of the entire system deteriorates due to unnecessary power consumption.

Further, in this conventional refrigerator, the heat radiation head of the Stirling refrigerator is connected to the metal surface of the refrigerator body to partially play a role of heat radiation, and the heat exchange load of the heat radiation heat exchanger. However, considering the properties of the metal material used for the body surface and the surrounding environment during heat dissipation,
Since the metal surface portion has a large thermal resistance in the heat diffusion direction, it can contribute to effective heat exchange only in the vicinity of the heat source, that is, in the vicinity of the radiation head. Therefore, since the heat exchange capacity of the metal surface portion is small, it is not very useful for reducing the load on the heat radiating heat exchanger, and the miniaturization of the heat radiating heat exchanger has been stopped.

Further, a door packing made of elastic rubber or the like is provided on a peripheral portion on the inner side of the door in order to secure the airtightness in the cooling chamber. Has a structure in which it directly touches the door packing or the outer plate portion, the temperature of this portion is particularly low as compared with other portions, and moisture contained in the external air is easily condensed and dew tends to be formed. Dew can cause it to fall and wet floors and rust metal parts.

Therefore, in general, a heater is buried in a portion where dew easily adheres, and this portion is heated by the heater to prevent dew. However, the use of the dew-prevention heater consumes extra power unrelated to the operation of the refrigeration system, which is disadvantageous for future home refrigerators that require low price and energy saving.

[0015] Drain water generated by defrosting in the cooling cabinet is collected in a drain plate. However, it is troublesome to take out the drain plate periodically and discard the accumulated water.
Maintenance free was realized by forcibly evaporating the drain water using the heat of the condenser.

On the other hand, in a refrigerator using an inverse Stirling cycle, since there is no part corresponding to a condenser which is a component of a vapor compression type refrigeration cycle, drain water is generally removed by heating with a heater. . However, the use of the heater consumes extra electric power, and has a problem that the electricity cost is large and uneconomical.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a Stirling cooler which can reduce the size of a heat exchanger and is advantageous in energy saving. Still another object of the present invention is to provide a Stirling cooler which can prevent dew near the door packing and realize a maintenance-free drain plate for collecting drain water.

[0018]

In order to achieve the above object, the present invention comprises a heat absorbing heat exchanger attached to a heat absorbing section, and a heat radiating heat exchanger attached to a heat radiating section.
In a Stirling cooler provided with a Stirling refrigerator that obtains cold heat in the heat absorbing section by a reverse Stirling cycle, one end of a dew-prevention heat pipe is connected to the heat radiating section or the heat radiating heat exchanger, and the dew-preventing heat is connected. The other end of the pipe is guided to the opening side of the cooling box, and the waste heat released from the heat radiating section by driving the Stirling refrigerator is conveyed through the dew-prevention heat pipe to heat the opening side. It is characterized by the following.

According to this structure, since the waste heat released from the heat radiating section is conveyed through the dew-prevention heat pipe, the opening side of the refrigerator is heated, so that dew condensation on this portion is prevented. You.

The present invention also provides a Stirling heat exchanger having a heat-absorbing heat exchanger attached to a heat-absorbing portion and a heat-radiating heat exchanger attached to a heat-radiating portion, wherein the heat is absorbed by the heat absorbing portion by an inverse Stirling cycle. In a Stirling cooler provided with a refrigerator and a drain plate for collecting drain water in the cooler or the heat exchanger for heat absorption, one end of a heat pipe for drain evaporation is provided to the heat radiating portion or the heat exchanger for heat radiating. And a part of the other end side of the drain evaporation heat pipe is guided into the drain dish, and the waste heat released from the heat radiating unit by driving the Stirling refrigerator is used as the drain evaporation heat pipe. And the drain water is conveyed through the heater to heat the drain water.

According to this structure, the waste heat released from the heat radiating section is conveyed through the heat pipe for drain evaporation, so that the drain water collected in the drain plate by defrosting in the refrigerator or the like is heated. Therefore, the drain water evaporates.

Further, the present invention has a heat-exchanging heat exchanger attached to a heat-absorbing section, and a heat-radiating heat exchanger attached to a heat-radiating section, and uses a reverse Stirling cycle to obtain cold heat in the heat-absorbing section. In a Stirling cooler equipped with a refrigerator, while connecting one end of a dew-prevention heat pipe to the heat radiating portion or the heat radiating heat exchanger,
The other end of the dew-prevention heat pipe is guided to the opening side of the cooling box, and waste heat released from the heat radiating unit by driving the Stirling refrigerator is conveyed through the dew-prevention heat pipe to open the heat sink. Side, and one end of a drain evaporating heat pipe is connected to the heat radiating portion or the heat radiating heat exchanger, and a part of the other end of the drain evaporating heat pipe is placed in the drain pan. And the waste heat released from the heat radiating unit by driving the Stirling refrigerator is conveyed through the drain evaporation heat pipe to heat the drain water.

According to this configuration, since the waste heat released from the heat radiating section is conveyed through the dew-prevention heat pipe, the opening side of the refrigerator is heated, so that dew condensation on this portion is prevented. At the same time, the waste heat released from the heat radiating section is transported through the heat pipe for drain evaporation, so that the drain water collected in the drain plate by defrosting in the refrigerator is heated. Evaporates.

In this case, a conductive base is interposed between the heat radiating portion and the heat radiating heat exchanger by heat composed of a good heat conductor, and the dew-prevention heat pipe or the drain evaporation is provided on the heat conductive base. By connecting one end of the heat pipe, waste heat released from the heat radiating portion is easily transported through each heat pipe, so that the load on the heat radiating heat exchanger is reduced.

The heat conduction base has a cylindrical shape, and the heat radiating heat exchanger has a corrugated fin, a louver fin, or a flat plate fin provided along an axial direction around the entire outer peripheral surface of the heat conduction base. Thus, the occupied volume of the heat-radiating heat exchanger can be reduced in the radial direction.

[0026] The connection between one end of the dew-prevention heat pipe or the drain evaporation heat pipe and the heat radiating section is made by connecting one end of the dew-prevention heat pipe or the drain evaporation heat pipe to the radiating section. This can be easily performed by attaching to the end face or inserting one end of the dew-prevention heat pipe or the drain evaporation heat pipe into a small hole provided in the end face of the heat radiating section.

Further, the present invention provides a Stirling heat exchanger having a heat-absorbing heat exchanger attached to a heat-absorbing section and a heat-radiating heat exchanger attached to a heat-radiating section, wherein the heat is absorbed by the heat absorbing section by an inverse Stirling cycle. In a Stirling cooler provided with a refrigerator and a drain plate for collecting drain water in the cooler or the heat exchanger for heat absorption, one end of a heat pipe for drain evaporation is provided to the heat radiating portion or the heat exchanger for heat radiating. And a part of the other end side of the drain evaporation heat pipe is connected to the drain plate, and the waste heat released from the heat radiating unit by driving the Stirling refrigerator is used for the drain evaporation heat pipe. And the drain water is conveyed through the heater to heat the drain water.

According to this structure, the waste heat released from the heat radiating section is conveyed through the drain plate via the drain evaporation heat pipe, and is recovered in the drain plate by defrosting in the refrigerator or the like. Since the drain water is heated, the drain water evaporates.

Further, by attaching a plurality of fins having hydrophilicity to the portion of the heat pipe for drain evaporation located in the drain dish, the surface of the fin also contributes to the evaporation of the drain water.

Further, it is detected whether or not there is drain water in the drain plate by a water level detecting sensor provided in the drain plate, and based on the detection result, air is blown to the heat radiating portion or the heat radiating heat exchanger. The provision of the power supply control circuit for controlling the air flow rate of the air-cooling fan enables the driving of the air-cooling fan with reduced power consumption depending on the situation.

The temperature sensors provided at one end and the other end of the drain evaporation heat pipe detect whether or not the heat is conveyed by the drain evaporation heat pipe. Based on the detection result, The provision of the power supply control circuit for controlling the air flow rate of the air-cooling fan that blows air to the heat-radiating section or the heat-radiating heat exchanger makes it possible to drive the air-cooling fan with reduced power consumption depending on the situation.

[0032]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a refrigerator according to the present invention, and FIG. 2 is a rear view of the refrigerator. In these figures, 1 is a refrigerator main body, 2 is a main body 1
A heat insulating material filled in a gap between the inner box and the outer box, a heat insulating door 3 for opening and closing the front opening of the storage room 50, and a machine room 4 in which a refrigeration unit described later is disposed.

The cool air blow duct 5 communicates with the storage room 50 through an opening 5 a formed in the back of the storage room 50. A cool air blower fan 7 for sending cool air into the storage room 50 is provided near the opening 5 a in the cool air blow duct 5. The cool air circulated through the storage chamber 50 by the cool air blower fan 7 is returned from the return air blower duct 6 to the cool air blower duct 5 and is blown to the heat absorbing heat exchanger 12 attached to the cold head 11 of the Stirling refrigerator 8. Is done. Then, the cool air that has been cooled by recovering the cool heat flows through the cool air blow duct 5 again and passes through the opening 5 a to the storage room 50.
To cool the inside of the storage room 50.

The refrigeration unit is disposed in a machine room 4 formed at the lower part of the lower part of the refrigerator main body 1. The refrigeration unit is, as shown in FIG.
And a heat-exchanging heat exchanger 10 connected to the warm head 9.
And a heat exchanger for heat 12 connected to a cold head 11
A heat exchange duct 13 for heat radiation, an air cooling fan 14, and a heat pipe 16 for drain evaporation provided in a drain plate 15.
And a heat exchanger heat pipe 17.

The Stirling refrigerator 8 includes a displacer 24 for rapidly expanding a working medium such as helium sealed in a cylinder in an expansion space 27, a piston 25 for rapidly compressing a working medium in a compression space 28, and a piston 25.
Motor 26 for providing power for repetitive motion of
And the heat absorbing side internal heat exchanger 23 disposed in the expansion space 27.
And the heat radiation side internal heat exchanger 21 disposed in the compression space 28
And the heat absorption side internal heat exchanger 23 and the heat radiation side internal heat exchanger 21
And a heat storage heat exchanger 22 which forms a closed circuit which is interposed between the expansion space 27 and the compression space 28 and interposed between the heat exchanger 22 and the heat exchanger 22.

In such a Stirling refrigerator 8, when the linear motor 26 is driven, the displacer 24 and the piston 25 arranged in series repeatedly move while maintaining a constant phase difference. The working medium compressed by the piston 25 in the compression space 28 has heat, and after radiating heat from the heat radiating heat exchanger 10 through the heat radiating side internal heat exchanger 21 and the worm head 9, the heat storage heat exchanger 22 Through the expansion space 27. The working medium expanded by the displacer 24 in the expansion space 27 returns to the compression space 28 side after passing through the heat absorbing internal heat exchanger 23.
By absorbing heat from the heat absorbing heat exchanger 12 via the cold head 11, the return air returned from the storage room 50 (FIG. 1) via the return air ventilation duct 6 (FIG. 1) is cooled.

The heat exchanger for heat absorption 12 attached to the cold head 11 includes a base portion 29 and a fin portion 30. Since the heat absorbing heat exchanger 12 is used below the freezing point of water, the fin pitch of the fin portion 30 must be increased to prevent frost. Furthermore, the space in the machine room 4 (particularly in the height direction) where the refrigeration unit is installed is limited, so that the fin portions 30 cannot be stacked high. Therefore, it is preferable to increase the heat transfer area of the heat radiating heat exchanger 12 in the radial direction according to the required heat exchange performance.

However, when the fin portion 30 becomes large in the radial direction, the thermal resistance increases as the distance from the cold head 11 near the center decreases, and the heat exchange efficiency near the outer peripheral portion of the heat absorbing heat exchanger 12 decreases. There was a problem of doing it. Therefore, in the present invention, as shown in FIG. 4, a heat pipe 71 in which a refrigerant such as carbon dioxide or pentane is sealed is buried inside a base portion 29 made of a good heat conductive material. Thereby, since the cold heat is sufficiently diffused through the heat pipe 71 also to the fin portion 30 located at a position away from the cold head 11, the temperature difference over the entire fin portion 30 is reduced, and desired heat exchange is achieved. Efficiency is obtained.

On the other hand, as shown in FIG. 5, the heat-radiating heat exchanger 10 connected to the worm head 9 has an annular base 31 made of a good heat-conductive material in which a temperature uniforming heat pipe 33 is embedded. And a fin 32 having high thermal conductivity, such as a corrugated fin or a louver fin, attached to the annular base 31. The heat exchanger 1 for absorbing heat in the axial direction with one end of the worm head 9 as a tip.
It is provided so as to extend long away from 2. Thus, the heat transfer area of the heat exchanger for heat dissipation 10 can be made wider in the radial direction, and in combination with the compactness of the heat exchanger for heat absorption 12 described above, the cooling performance of the Stirling refrigeration unit can be maintained while maintaining the cooling performance. This can be arranged in the room 4 in a space-saving manner.

By the way, the air inside the refrigerator 1 is kept at -20 ° C. or lower in the freezer compartment and 10 ° C. in the refrigerator compartment.
It has been cooled to the following low temperatures. Therefore, the cold air 40 in the refrigerator
As shown in FIG. 6, an outer plate arranged on the opening side of the refrigerator 1 in a state where the heat insulating door 3 is closed, as shown in FIG. A door packing 41 that is in close contact with the portion 42 is provided. The periphery of the door packing 41 has a structure in which the cool air 40 directly touches the door packing 41 or the outer plate part 42 due to the opening / closing operation of the heat insulating door 3 or the like. Water in the outside air condenses and dew easily forms. The attached dew flows down under its own weight and wets the floor and causes rust.

Therefore, in a general refrigerator, a heater is provided on the outer plate portion 42 which is in contact with the door packing 41 to prevent dew condensation, and the temperature of this portion is raised so as to approach the outside temperature. However, the use of such a dew-prevention heater disadvantageously consumes extra power and is disadvantageous for energy saving.

Accordingly, in the present invention, FIGS. 1, 2 and 6
As shown in the figure, one end (radiation condensing portion) of the dew-prevention heat pipe 17 is provided around the inside of the outer plate portion 42 in contact with the door packing 41 and the heat insulating material 2 at the back thereof, and the other end ( As shown in FIG. 3, the endothermic evaporating section) is inserted into a small hole provided in the end face of the worm head 9.
Connected. A part of the waste heat from the worm head 9 of the Stirling refrigerator is conveyed to the periphery of the door packing 41 by using the dew-prevention heat pipe 17 and the periphery of the door packing 41 is heated, thereby heating the periphery of the door packing 41. Dew is prevented. Therefore, according to the present invention, it is not necessary to use an electric heater to prevent dew condensation, so that energy saving is achieved.

Further, by using the dew-prevention heat pipe 17 to absorb the cold heat leaked from the inside of the refrigerator, the outer plate portion 42 that is further in contact with the dew-prevention heat pipe 17 is also used.
Since the heat exchange between the worm head 9 and the external space is performed through the heat sink, the load on the heat radiating heat exchanger 10 can be reduced, so that the heat radiating heat exchanger 10 can be downsized. In addition, a thermosiphon can be used instead of the dew-prevention heat pipe 17.

Drain water generated by defrosting the inside of the refrigerator or the heat exchanger 12 for heat absorption is collected in a drain plate 15 provided at a lower portion of the refrigerator 1. Therefore, the drain water must be periodically removed so that the collected drain water does not overflow into the drain plate 15. In a refrigerator using a conventional vapor compression refrigeration cycle, drain water is evaporated using heat released when a refrigerant is condensed and liquefied in a condenser. According to this, the time and effort for maintenance for periodically taking out the drain tray 15 and discarding the accumulated drain water is omitted.

On the other hand, in the Stirling refrigerator 8 using the reverse Stirling cycle, since there is no component corresponding to the condenser, the drain water cannot be removed by the heat of the condenser. Therefore, in the present invention, as shown in FIG.
A part of one end (radiation condensing part) side of the heat pipe 16 for drain evaporation is provided in a drain plate 15 disposed below the inside of the machine room 4 so as to be located inside the drain plate 15. The other end (endothermic evaporator) of the heat pipe 16 is inserted and connected to a small hole provided on the end face of the worm head 9 of the Stirling refrigerator 8.

Thus, part of the waste heat from the worm head 9 is given to the drain water by the drain evaporation heat pipe 16, and the evaporation of the drain water is promoted. Also, the heat pipe 16 for drain evaporation is brought into close contact with the bottom of a drain plate 15 made of a good heat conductive material, and a part of the heat from the worm head 9 conveyed by the heat pipe 16 for drain evaporation is drained. It is provided to the drain water via the plate 15. By doing so, the effective heat transfer area for supplying heat to the drain water increases, so that the drain water can be efficiently evaporated.

Therefore, since the drain water evaporates quickly before it accumulates in the drain plate 15, there is no fear of overflow, and the maintenance of the drain plate 15 can be free. Further, since a part of the waste heat from the warm head 9 of the Stirling refrigerator 8 is supplied through the drain evaporation heat pipe 16 to promote the evaporation of the drain water, the heat radiation load of the heat radiation heat exchanger 10 is reduced. it can. Then, the amount of cooling air blown to the heat radiation heat exchanger 10 can be reduced according to the reduced amount of heat radiation, whereby the output of the air-cooling fan 14 can be reduced and the number of rotations can be reduced. Therefore, the power consumption of the air cooling fan 14 can be reduced,
Energy saving is achieved.

However, since the drain water is intermittently stored in the drain plate 15 in accordance with the dehumidifying operation of the refrigerator 1 or the like, the drain evaporation heat pipe 16 is placed in the drain plate 15 such as after the refrigerator has been dehumidified. Only when drain water is recovered to some extent, the drain evaporation heat pipe 16
Can demonstrate his ability. Therefore, in the present invention,
As shown in FIG. 7, a water level detection sensor 61 is provided in the drain plate 15, and the number of rotations of the air cooling fan 14 is controlled by a power supply control circuit 62 based on a signal from the water level detection sensor 61.

That is, when drain water is present in the drain plate 15 by the water level detection sensor 61, the drain heat is conveyed by the heat pipe 16 for drain evaporation and the drain water evaporation effect is high. The input voltage to 14 is dropped. Conversely, when the drain water in the drain plate 15 is empty, there is no drain water to evaporate, so that the air-cooling fan 14 is rotated at the rated speed to promote heat radiation from the heat exchanger 10 for heat radiation. Let it.

In place of the water level detection sensor 61, as shown in FIG.
Temperature sensors 63, 63 such as thermocouples are provided at the endothermic evaporating section and the heat radiating condensing section at both ends of the
2, the power control circuit 62 determines whether the heat pipe 16 for drain evaporation is operating based on the information, and controls the rotation speed of the air-cooling fan 14.

When the drain evaporation heat pipe 16 is brought into close contact with the drain plate 15 made of a good heat conductive material, the heat transferred by the drain evaporation heat pipe 16 causes the drain water to flow through the drain plate 15. Given to. This increases the area that can supply heat to the drain water,
The drain water can be efficiently and promptly evaporated.

Further, the above-mentioned heat pipe for drain evaporation 1
In 6, a plurality of hydrophilic fins 34 may be provided on the heat dissipation / condensation side located in the drain dish 15. In this case, the effective heat transfer area for the drain water is increased by the hydrophilic fins 34, and the evaporation of the drain water can be promoted. in this case,
Even when the surface of the drain water is at a position lower than the hydrophilic fins 34, since the surface of the hydrophilic fins 34 has been subjected to the hydrophilic treatment, the entire surface of the hydrophilic fins 34 is wet and a wide evaporation area can always be secured. Furthermore, since a larger heat transfer area can be maintained than when only the drain plate 15 is used as the heat transfer portion, it is not always necessary to use a good heat conductive material for the drain plate 15.

Here, the heat pipe 1 for preventing dew
One end of the heat pipe 7 and the drain evaporating heat pipe 16 is fixed to the end face of the worm head 9 by bonding or the like, or is inserted and connected to a small hole provided in the end face of the worm head 9 in advance. When the space for providing the heat pipes 16 and 17 on the end face of the worm head 9 cannot be sufficiently secured, or when it is desired to unitize the connecting portion of the heat pipes 16 and 17, as shown in FIG. An annular heat conductive base 51 having an inner diameter substantially equal to the outer diameter is fixed to the outer peripheral portion of the worm head 9, and one ends of the heat pipes 16 and 17 are provided along the circumferential direction of the end surface of the heat conductive base 51. It is good to insert it into a plurality of small holes.

Since the inner diameter of the heat conducting base 51 is selected to be substantially equal to the outer diameter of the worm head 9, the annular heat conducting base 51, the heat pipe 16 for drain evaporation and the heat pipe 17 for preventing dew The structure is easy to integrate and the mass production is easy, and the waste heat from the worm head 9 can be transmitted to the heat radiating heat exchanger 10 to be efficiently released. Although the present invention has been described by taking a free piston type Stirling refrigerator as an example, the present invention is also applicable to a Stirling refrigerator of a type other than the free piston type.

[0055]

As described above, according to the present invention, the opening side of the refrigerator is heated by transporting the waste heat released from the heat radiating portion by driving the Stirling refrigerator through the dew-prevention heat pipe. As a result, without using a heater, dew condensation on the opening side of the refrigerator, where dew easily forms due to opening and closing of doors, can be effectively and energy-saving, and the heat radiation heat exchanger attached to the heat radiation part The load can be reduced.

Further, according to the present invention, waste heat released from the heat radiating section is conveyed through the heat pipe for drain evaporation to evaporate drain water generated by defrost in the refrigerator and collected in the drain plate. By doing so, the drain water can be evaporated with energy saving without using a heater, the maintenance of the drain plate can be achieved, and the load of the heat exchanger for heat radiation attached to the heat radiation part can be reduced.

Further, according to the present invention, the water level in the drain plate is detected by the water level detecting sensor provided in the drain plate, and based on the detection result, the air is blown to the heat radiating portion or the heat radiating heat exchanger of the Stirling refrigerator. Since the number of rotations of the air-cooling fan is controlled, the power consumption of the air-cooling fan can be effectively suppressed, and an energy-saving refrigerator can be provided.

According to the present invention, whether or not heat is conveyed by the drain evaporation heat pipe is detected by the temperature sensors provided at one end and the other end of the drain evaporation heat pipe. Based on the results, the number of rotations of the air cooling fan that blows to the heat radiating section of the Stirling refrigerator and the heat radiating heat exchanger is controlled, so that the power consumption of the air cooling fan can be suppressed effectively, and an energy-saving refrigerator Can be provided.

Further, according to the present invention, by using an annular heat-radiating heat exchanger which is long in the axial direction of the Stirling refrigerator and surrounds the heat-radiating portion, the occupied volume of the heat-radiating heat exchanger is increased in the radial direction. The size of the refrigeration unit can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view of a refrigerator according to the present invention.

FIG. 2 is a rear view of the refrigerator.

FIG. 3 is a sectional view of a refrigerating unit of the refrigerator.

FIG. 4 is a sectional view of a heat exchanger for absorbing heat of the refrigeration unit.

FIG. 5 is a front view (a) and a side view (b) of a heat exchanger for heat dissipation of the refrigeration unit.

FIG. 6 is an enlarged sectional view of a main part of the refrigerator.

FIG. 7 is a schematic diagram illustrating an example of a control mechanism of an air cooling fan of the refrigeration unit.

FIG. 8 is a schematic diagram illustrating another example of the control mechanism of the air-cooling fan of the refrigeration unit.

FIG. 9 is a front view (a) and a cross-sectional view (b) of a heat conduction base interposed between a worm head of the refrigeration unit and a heat exchanger for heat dissipation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator main body 2 Insulation material 3 Insulation door 4 Machine room 5 Cold air ventilation duct 6 Return air ventilation duct 7 Cold air ventilation fan 8 Stirling refrigerator 9 Warm head 10 Heat exchanger for heat radiation 11 Cold head 12 Heat exchanger for heat absorption 13 Air ventilation duct 14 Air Cooling Fan 15 Drain Plate 16 Drain Evaporation Heat Pipe 17 Dew Prevention Heat Pipe 21 Heat Dissipation Side Internal Heat Exchanger 22 Heat Storage Heat Exchanger 23 Heat Sink Side Internal Heat Exchanger 24 Displacer 25 Piston 26 Linear Motor 27 Expansion Space 28 Compression Space 29 base part 30 fin part 31 annular base 32 fin 33 temperature equalizing heat pipe 34 hydrophilic fin 40 cold air 50 storage room 51 heat conduction base 61 water level detection sensor 62 power supply control circuit 63 temperature sensor

Claims (10)

[Claims] 1. A heat exchanger for heat absorption attached to a heat absorber, and a heat exchanger for heat dissipation attached to a heat radiator,
In a Stirling cooler provided with a Stirling refrigerator that obtains cold heat in the heat absorbing section by a reverse Stirling cycle, one end of a dew preventing heat pipe is connected to the heat radiating section or the heat radiating heat exchanger, and the dew preventing heat is connected. The other end of the pipe is guided to the opening side of the cooling box, and the waste heat released from the heat radiating section by driving the Stirling refrigerator is conveyed through the dew-prevention heat pipe to heat the opening side. A Stirling cooler characterized by: 2. A heat-exchanging heat exchanger attached to the heat-absorbing section, and a heat-exchanging heat exchanger attached to the heat-dissipating section,
In a Stirling refrigerator having a Stirling refrigerator that obtains cold heat in the heat absorbing section by an inverse Stirling cycle, and a drain plate that collects drain water from the cooling chamber or the heat absorbing heat exchanger, the heat radiation section or the heat radiation While connecting one end of the drain evaporation heat pipe to the heat exchanger, and guiding a part of the other end of the drain evaporation heat pipe into the drain dish,
A Stirling cooler wherein the waste heat released from the heat radiating unit by driving the Stirling refrigerator is conveyed through the drain evaporation heat pipe to heat the drain water. 3. A heat exchanger for heat absorption attached to the heat absorbing section, and a heat exchanger for heat dissipation attached to the heat radiating section,
In a Stirling cooler provided with a Stirling refrigerator that obtains cold heat in the heat absorbing section by a reverse Stirling cycle, one end of a dew preventing heat pipe is connected to the heat radiating section or the heat radiating heat exchanger, and the dew preventing heat is connected. The other end of the pipe is guided to the opening side of the cooling box, and the waste heat released from the heat radiating section by driving the Stirling refrigerator is conveyed through the dew-prevention heat pipe to heat the opening side. And connecting one end of a drain evaporating heat pipe to the heat radiating portion or the heat radiating heat exchanger, and guiding a part of the other end of the drain evaporating heat pipe into the drain pan, Waste heat released from the radiator by driving the refrigerator is conveyed through the drain evaporation heat pipe to heat the drain water. A Stirling cooler characterized in that it is made to be. 4. A heat conductive base made of a good heat conductor is interposed between the heat radiating portion and the heat radiating heat exchanger, and the dew-prevention heat pipe or the drain evaporating heat is provided on the heat conductive base. The Stirling cooler according to any one of claims 1 to 3, wherein one end of the pipe is connected. 5. The heat conduction base has a cylindrical shape,
5. The Stirling cooler according to claim 4, wherein the heat radiating heat exchanger is formed of a corrugated fin, a louver fin, a flat plate fin, or the like provided along the axial direction around the entire outer peripheral surface of the heat conductive base. 6. . 6. The connection between one end of the dew-prevention heat pipe or the drain evaporating heat pipe and the heat radiating unit includes connecting one end of the dew-prevention heat pipe or the drain evaporating heat pipe to the radiating unit. 2. The method according to claim 1, wherein the heat pipe is attached to an end face, or one end of the dew-prevention heat pipe or the drain evaporation heat pipe is inserted into a small hole provided in an end face of the heat radiating portion.
The Stirling cooler according to claim 3. 7. A heat-exchanging heat exchanger attached to the heat-absorbing section, and a heat-radiating heat exchanger attached to the heat-radiating section,
In a Stirling refrigerator having a Stirling refrigerator that obtains cold heat in the heat absorbing section by an inverse Stirling cycle, and a drain plate that collects drain water from the cooling chamber or the heat absorbing heat exchanger, the heat radiation section or the heat radiation Connecting one end of a drain evaporation heat pipe to the heat exchanger, and connecting a part of the other end of the drain evaporation heat pipe to the drain plate,
A Stirling cooler wherein the waste heat released from the heat radiating unit by driving the Stirling refrigerator is conveyed through the drain evaporation heat pipe to heat the drain water. 8. The drain pipe according to claim 2, wherein a plurality of fins having hydrophilicity are attached to a portion of the heat pipe for drain evaporation which is located in the drain plate.
A Stirling cooler according to the item. 9. A water level detection sensor provided in the drain plate detects whether or not there is drain water in the drain plate, and blows air to the heat radiating portion or the heat radiating heat exchanger based on the detection result. 9. The Stirling cooler according to claim 2, further comprising a power supply control circuit for controlling a flow rate of the air cooling fan. 10. A temperature sensor provided at one end and the other end of the drain evaporation heat pipe detects whether or not the heat is conveyed by the drain evaporation heat pipe, and based on the detection result. 9. The Stirling cooler according to claim 2, further comprising a power supply control circuit for controlling an air flow rate of an air cooling fan that blows air to the heat radiating section or the heat radiating heat exchanger. .