JP2007017057A - Cooling chamber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling chamber, capable of stably and efficiently evaporating drain water over a long period with minimized energy and without using a device needing much energy for drive, and preventing collection of moisture on the back part and side part of the cooling chamber. <P>SOLUTION: The cooling chamber A comprises a Stirling refrigerator 2, a heater exchanger 4, a U-turn air duct 5 continuously formed extending over a bottom part 1A and a back part 1B so as to introduce/derive outside air to and from the heat exchanger 4, and having a suction port 51 and an exhaust port 57 at a front portion, and a drain water evaporator 7 disposed in a bottom exhaust passage 56 of the U-turn air duct. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a refrigerator using a Stirling refrigerator.

  In a conventional refrigerator, heat of a condenser or a compressor constituting a refrigeration cycle is used for evaporation of water (hereinafter referred to as drain water) generated by defrosting the evaporator. This drain water evaporation device heats and evaporates the drain water by allowing a high-temperature refrigerant flowing in the refrigeration cycle to flow around a drain pan for storing the drain water. Evaporation can be performed.

  In recent years, a Stirling refrigerator that does not use an ozone depleting substance as a refrigerant has attracted attention. The Stirling refrigerator includes a low temperature part and a high temperature part, and the inside of the refrigerator is cooled by a low temperature side refrigerant circulation circuit attached to the low temperature part. The heat generated in the high temperature part is radiated to the outside by a heat exchanger.

  When a Stirling refrigerator is used as a cooling device, there is a drain water evaporation process that uses a high-temperature refrigerant circulating in the heat exchanger as described in the invention described in JP-A-2004-20056. More specifically, the heat exchanger has two independent refrigerant circulation circuits, and the first high temperature side heat exchanger is a natural circulation type thermosyphon, and exchanges heat with the outside air using a condenser. The second high temperature side heat exchanger heats and evaporates the drain water accumulated in the drain pan by causing the refrigerant enclosed inside to flow around the drain pan.

In addition, as disclosed in Japanese Patent Application Laid-Open No. 2001-165553, there is an apparatus that blows air to a drain pan to evaporate drain water.
Japanese Patent Laid-Open No. 2004-20056 JP 2001-165553 A

  The low temperature side refrigerant circulation circuit employs a natural circulation type thermosiphon, and the low temperature side evaporator is disposed below the Stirling refrigerator. The drain pan is disposed below the low-temperature side evaporator, and the invention described in Japanese Patent Application Laid-Open No. 2004-20056 allows the refrigerant circulating in the second high-temperature side heat exchanger to flow around the drain pan. In order to cause the refrigerant to flow, a refrigerant circulation pipe is disposed and a circulation pump for circulating the refrigerant is required.

  As in the invention described in Japanese Patent Application Laid-Open No. 2001-165553, in the case where air is blown to the drain pan to evaporate the drain water, the mounting positions of the air suction port and the exhaust port become a problem. Foreign substances such as dust and dust are likely to accumulate on the back surface, particularly in the lower part of the refrigerator, and when the suction port is disposed on the back surface, foreign objects are sucked. In addition, when the exhaust port is located on the back, moisture can easily accumulate on the back of the refrigerator, causing condensation on the bottom and / or side of the refrigerator, causing rust on the wall of the refrigerator, and dripping water to wet the floor. Such problems occur.

  Therefore, the present invention is a refrigerator that uses a Stirling refrigerator as a cooling device, efficiently exhausting heat generated from the Stirling refrigerator, increasing the cooling capacity of the Stirling refrigerator, and reducing power consumption. With the goal.

  In addition, the present invention uses the heat generated in the high temperature part of the Stirling refrigerator to evaporate the drain water, so that the drain water can be stably evaporated, and the refrigerator is operated in an energy-saving manner. Objective.

  In order to achieve the above-described object, the present invention is a refrigerator that cools the inside of a refrigerator with a Stirling refrigerator, and is connected to a Stirling refrigerator provided at the back of the refrigerator and a high-temperature portion of the Stirling refrigerator. A heat exchanger and a U-turn formed continuously over the bottom and back of the cooler so as to introduce / lead outside air into the heat exchanger, and an intake port and an exhaust port are formed on the front surface of the bottom of the cooler Type ventilation path, a blower disposed in the U-turn ventilation path and in the vicinity of the heat exchanger, and drain water disposed on the exhaust side at the bottom of the U-turn ventilation path A refrigerator having an evaporation device is provided.

  According to this configuration, since the intake port is formed on the front side of the lower part of the refrigerator, it is possible to introduce low-temperature air into the U-turn type air passage as compared with the case where it is provided at another position. Thereby, the heat exchange efficiency in the said heat exchanger can be improved. In addition, since the front side of the refrigerator has less floating and accumulation of foreign matters such as dust, dust, etc., it is possible to introduce outside air with a low content of the foreign matters into the U-turn type air passage.

  The air passing through the heat exchanger is heated by the heat generated from the Stirling refrigerator, becomes high-temperature air having a low relative humidity, and flows into the drain water evaporator, so the evaporation efficiency in the drain water evaporator Can be increased.

  In addition, since the outside air is introduced from the lower front portion of the cooling chamber and passes through the drain water evaporator and the air containing the vapor is led out from the exhaust port provided in the lower front portion of the cooling chamber, the back portion of the cooling chamber Since air with high humidity is not discharged to the side portions or the like, it is possible to prevent moisture from accumulating on the back and side portions of the refrigerator.

  The said structure WHEREIN: The said U-turn type ventilation path may have a cover member in which the partition part which partitions off an intake side and an exhaust side was integrally formed. Thus, the partition part is formed integrally with the cover member, so that the structure of the refrigerator can be simplified. An example of the material of the partition portion is urethane foam. Moreover, it is not limited to this, What can seal airtightly can be employ | adopted widely.

  The said structure WHEREIN: The said drain water evaporation apparatus may be provided with the air blower for evaporation which blows the air by the side of an exhaust on a drain pan. By providing the evaporation blower, it is possible to suppress a decrease in the flow velocity of the air flowing through the U-turn type ventilation path. In particular, it is possible to suppress a decrease in flow velocity due to pressure loss at the bent portion where the back portion and the bottom portion of the U-turn type ventilation path are connected.

  The said structure WHEREIN: The said drain water evaporation apparatus may be equipped with the heating apparatus for heating the air sprayed on a drain pan. By attaching the heating device, when the outside air temperature is very low, when the Stirling refrigerator is stopped for defrosting operation, when operating at low load, etc., the heat from the heat exchanger Even when the discharge is insufficient, the heat of the air flowing into the drain water evaporator can be sufficiently heated. At this time, the driving of the heating device may be operated based on the operation of the Stirling refrigerator, and a temperature detection means is disposed upstream of the heating device in the U-turn type ventilation path, and the temperature detection is performed. The amount of heat released from the heating device may be adjusted based on the temperature of the air measured by the means.

  According to the present invention, in the cooler that cools the interior by the Stirling refrigerator, since the intake port of the U-turn type ventilation path is formed on the front side of the cooler lower part, compared to the case where it is provided at other positions, Low-temperature air can be introduced into the U-turn type air passage, so that the heat exchange efficiency in the heat exchanger can be increased and the heat dissipation efficiency of the Stirling refrigerator can be increased.

  And since the air heated by the heat exchanger flows into the drain water evaporator and the drain water is heated and evaporated, it suppresses the energy consumption conventionally required for drain water evaporation and reduces the power consumption. The drain water can be stably evaporated.

  In addition, the front side of the refrigerator can introduce foreign air such as dust, dust, etc. to the U-turn ventilation path with less floating and accumulation of foreign matter, reducing the amount of foreign matter attached to the heat exchanger, An increase in pressure loss of the heat exchanger can be suppressed. As a result, it is possible to suppress a decrease in the flow rate of air passing through the heat exchanger, to increase the heat dissipation efficiency of the heat exchanger, to improve the efficiency of the Stirling refrigerator, and to reduce power consumption. can do. Moreover, since the said refrigerator can heat air efficiently in the said heat exchanger, it can evaporate drain water stably.

  In addition, the U-turn type air passage passes through the drain water evaporator and draws out air containing a large amount of steam from an exhaust port provided in the lower front portion of the refrigerator. Since high-humidity air is not discharged to the back and sides of the cooler, moisture can be prevented from accumulating on the back and sides of the cooler. As a result, it is possible to suppress the occurrence of defects such as dew condensation on the back and sides of the refrigerator, rust on the back and sides of the refrigerator, generation of mold, corrosion, etc. at the installation location of the refrigerator. it can.

  In the case where the U-turn type ventilation path has a cover member in which a partition portion that partitions the intake side and the exhaust side is integrally formed, the structure of the refrigerator can be simplified. As the structure is simplified, the labor and time required for assembly can be reduced, and high maintainability is provided.

  In the case where the drain water evaporator is provided with an evaporation blower that blows air on the exhaust side to the drain pan, the flow rate of the air flowing through the U-turn type air passage is prevented from decreasing. In particular, it is possible to prevent a decrease in flow velocity due to pressure loss at the bent portion where the back portion and the bottom portion of the U-turn type ventilation path are connected. Thereby, the said refrigerator can evaporate drain water stably.

  When the drain water evaporator is equipped with a heating device for heating the air blown to the drain pan, when the outside temperature is very low, when the Stirling refrigerator is stopped for defrosting operation, etc. Even when heat release from the heat exchanger is insufficient, such as during low-load operation, the heat of the air flowing into the drain water evaporator can be sufficiently heated. Thereby, the said refrigerator can evaporate drain water stably.

The present invention will be described below with reference to the drawings.
(First embodiment)
FIG. 1 is a sectional view of a refrigerator according to the present invention, FIG. 2 is a rear view of the refrigerator shown in FIG. 1, and FIG. 3 is a bottom view of the refrigerator shown in FIG. As shown in FIG. 1, the refrigerator A is generated in the cabinet 1, the Stirling refrigerator 2, the secondary refrigerant circulation circuit 3 that conveys the cold generated in the Stirling refrigerator 2, and the Stirling refrigerator 2. A heat exchanger 4 for releasing the heat generated, a U-turn type air passage 5 for introducing / extracting outside air to the heat exchanger 4, a blower device 6 disposed in the vicinity of the heat exchanger 4, and a drain water evaporator 7.

  The cabinet 1 is a box formed of a heat-insulating material. The cabinet 1 has a freezer compartment 11 at the bottom and a refrigerator compartment 12 at the top. Doors 111 and 121 are arranged in the freezing room 11 and the refrigerating room 12, and the freezing room 11 and the refrigerating room 12 are sealed with the packing 13 when the doors 111 and 121 are closed.

  The Stirling refrigerator 2 has a low temperature part 21 and a high temperature part 22. The secondary refrigerant circulation circuit 3 is connected to the low temperature part 21, and the heat exchanger 4 is connected to the high temperature part 22. The secondary refrigerant circulation circuit 3 includes a low temperature side condenser 31, a low temperature side evaporator 32, and a refrigerant flow pipe 33. The low temperature side condenser 31 is disposed in contact with the low temperature part 21 of the Stirling refrigerator 2, and the low temperature side evaporator 32 is disposed behind the freezer compartment 11 below the low temperature side condenser 31 as illustrated. A loop-type thermosiphon is configured by connecting the low-temperature side condenser 31 and the low-temperature side evaporator 32 in a ring shape with a refrigerant flow pipe 33. The secondary refrigerant circulation circuit 3 is filled with a secondary refrigerant (which is not limited to carbon dioxide here).

  In the low temperature side condenser 31 arranged in contact with the low temperature part 21 of the Stirling refrigerator 2, the secondary refrigerant filled therein is cooled and condensed by the cold heat generated in the low temperature part 21 to be in a liquefied state. The liquefied secondary refrigerant flows down the refrigerant flow pipe 33 by gravity and flows into the low temperature side evaporator 32. The secondary refrigerant that has flowed into the low temperature side evaporator 32 evaporates and cools the surroundings with the heat of vaporization during evaporation. The secondary refrigerant flowing out from the low temperature side evaporator 32 is sent to the low temperature side condenser 31. By repeating the above operation, cold energy can be supplied to the inside of the cabinet 1 without using external power for circulating the secondary refrigerant.

  In addition, an internal cooling fan 112 for circulating the cooled air around the low temperature side evaporator 32 is attached inside the freezer compartment 11. The inside of the freezer compartment 11 is cooled by driving the internal cooling fan 112 and circulating the air inside the freezer compartment 11. Moreover, the cooled air is also sent to the refrigerator compartment 12, and the inside of the refrigerator compartment 12 is also cooled.

  As shown in FIGS. 1 and 2, the heat exchanger 4 includes a high temperature side evaporator 41, a high temperature side condenser 42, and a refrigerant pipe 43. The high temperature side evaporator 41 is disposed in contact with the high temperature portion 22 of the Stirling refrigerator 2. The high temperature side condenser 42 is disposed above the high temperature side evaporator 41. The high temperature side evaporator 41, the high temperature side condenser 42, and the refrigerant pipe 43 constitute a loop type thermosiphon. The heat exchanger 4 is filled with a refrigerant (but not limited to water here).

  The heat generated in the high temperature part 22 of the Stirling refrigerator 2 is transmitted to the refrigerant in the high temperature side evaporator 41. The refrigerant that has absorbed heat evaporates, flows through the refrigerant pipe 43, and flows into the high-temperature side condenser 42. The refrigerant flowing into the high temperature side condenser 42 is cooled by the air blower 6 by exchanging heat with the air passing through the high temperature side condenser 42. The cooled refrigerant is liquefied and circulated through the refrigerant pipe 43 to the high temperature side evaporator 41.

  The U-turn type ventilation path 5 includes an intake port 51, a bottom intake channel 52, a back intake channel 53, a U-turn unit 54, a back exhaust channel 55, a bottom exhaust channel 56, and an exhaust port 57. . The bottom intake path 52 and the bottom exhaust path 56 are partitioned by a bottom partition member 50, and the back intake path 53 and the back exhaust path 55 are partitioned by a back partition member 58.

  As shown in FIGS. 1 and 3, the intake port 51 and the exhaust port 57 are covered with a detachable grill 14. A filter 141 is detachably attached to a portion of the grill 14 that covers the intake port 51. By attaching the filter 141, foreign matter such as dust and dirt outside the refrigerator A can be prevented from flowing into the U-turn type air passage 5 from the air inlet 51. As a result, clogging of fins (not shown) of the high-temperature side condenser 42 occurs, and pressure loss is prevented from increasing when the air flows through the high-temperature side condenser 42, and heat exchange efficiency is prevented from being reduced. be able to. Here, the filter 141 has a mesh shape.

  The back intake passage 53 is connected to the machine room 10 in which the Stirling refrigerator 2 is disposed. In addition, the heat exchanger 4 attached to the high temperature section 22 of the Stirling refrigerator 2 and a blower device (here, the blower fan 6) for sucking outside air and introducing it into the high temperature side condenser 42 of the heat exchanger 4 are also provided in the machine room 10. Is attached.

  The bottom exhaust path 56 is provided with a drain water evaporation device 7 for evaporating drain water generated from the low temperature side evaporator 32 of the secondary refrigerant circulation circuit 3. The drain water evaporator 7 has a drain pan 71, a drain drain member (drain drain pipe 72), and an evaporation fan 73 constituting the evaporator. Moisture in the refrigerator A adheres to the surface of the low temperature side evaporator 32 as frost, and flows down below the low temperature side evaporator 32 as defrost water (drain water) during defrosting. The drain water flowing down flows through a drain water drain pipe 72 disposed below the low temperature side evaporator 32 and accumulates in the drain pan 71.

  The U-turn type ventilation path 5 has an intake port 51, a bottom intake channel 52, a back intake channel 53, a U-turn unit 54, a back exhaust channel 55, a bottom exhaust channel 56, and an exhaust port 57 so that air flows in this order. It is formed continuously. The back intake passage 52 and the machine room 10 are connected as described above. By driving the blower fan 6 disposed in the machine room 10, outside air is sucked from the intake port 51, passes through the bottom intake path 52, rises up the back intake path 53, and performs heat exchange disposed in the machine room 10. It flows into the high temperature side condenser 42 of the vessel 4. Heat is exchanged with the refrigerant in the high-temperature side condenser 42 of the heat exchanger 4 and is heated to become high-temperature dry air having a low relative humidity.

  The high-temperature dry air discharged from the heat exchanger 42 rises to the U-turn part 54, then turns back, descends the back exhaust path 55, flows into the bottom exhaust path 56, and flows into the drain water evaporator 7. The high-temperature dry air that has flowed into the drain water evaporator 7 is blown above the drain pan 71 by the evaporation fan 73. Since the high-temperature dry air has a low relative humidity, the drain water accumulated in the drain pan 71 can be evaporated by blowing it over the drain pan 71. The air containing a large amount of steam accumulated above the drain pan 71 is discharged from the exhaust port 57 by the wind force from the evaporation fan 73. In this way, the heat released by the heat exchanger 4 can be used for the evaporation of drain water.

  In this embodiment, the filter 141 has a mesh shape. However, the filter 141 is not limited thereto, and a filter that suppresses the inflow of foreign matters such as dust and dust is also widely used in addition to the mesh shape. Can do. In particular, those having a small pressure loss are preferred. The grill 14 shown in FIGS. 1 and 3 has a shape that integrally covers both the intake port 51 and the exhaust port 57, but covers the portion that covers the intake port 51 and the exhaust port 57 independently. It may be a thing. Alternatively, the intake port 51 and the exhaust port 57 may be integrally covered, and only the filter 141 disposed in front of the intake port 51 may be removed. A filter that can be easily attached and detached can be widely used.

(Second Embodiment)
FIG. 4 shows a cross-sectional view of another example of the refrigerator according to the present invention. In the refrigerator shown in FIG. 4, a seal member 101 is attached around the high temperature side condenser 42 of the heat exchanger 4 arranged in the machine room 10. Since the sealing member 101 is attached, the space between the heat radiation side condenser 42 and the wall surface of the machine room 10 is sealed, and the air sucked by the blower fan 6 and flowing into the machine room 10 from the back intake passage 521 is leaked. Without being introduced into the high-temperature side condenser 42. Moreover, it can prevent that the air heated with the high temperature side condenser 42 flows back between the high temperature side condenser 42 and the wall surface of the machine room 10, and can improve the heat exchange efficiency in the high temperature side condenser 42. Can increase the efficiency of the Stirling refrigerator.

(Third embodiment)
FIG. 5 shows a cross-sectional view of still another example of the refrigerator according to the present invention. The U-turn type air passage 5 of the refrigerator B shown in FIG. 5 has a detachable cover member 59. The other parts have the same configuration as the refrigerator A shown in FIG. 1 and the like, and substantially the same parts are denoted by the same reference numerals. The refrigerator B shown in FIG. 5 is in a state where the cover member 53 is removed. The cover member 59 has a bottom cover 591 that covers the bottom 1A of the cabinet 1 and a back cover 592 that covers the back 1B. The bottom cover 591 is integrally formed with a bottom partition member 50 for separating the bottom intake passage 52 and the bottom exhaust passage 56. Similarly, the back cover 592 is integrally formed with a back partition member 58 for separating into a back intake passage 52 and a back exhaust passage 55.

  The bottom 1A and the back 1B of the cabinet 1 of the refrigerator B are formed with recesses 15 and 16 for air to flow in advance. A bottom cover 591 is disposed in the recess 15 and the recess 15 is divided by the bottom partition member 50. Thus, a bottom intake passage 52 and a bottom exhaust passage 56 are formed. When the bottom cover 591 is attached to the recess 15, it is attached so that the air in the recess 15 does not leak to the outside, and the bottom partition member 50 divides the recess 15 in an airtight manner, and the bottom intake path 52 and the bottom exhaust path 56 can be formed such that no air flows into each other.

Similarly, a back cover 592 is disposed in the recessed portion 16, and the recessed portion 16 is divided by a back partition member 58 to form a back intake passage 53 and a back exhaust passage 55. Further, the back partition member 5
8, the upper part is formed shorter than the upper end part of the recessed part 16, and the U-turn part 54 is formed in the part in which this back part partition member 58 is not formed. When the back cover 592 is attached to the recess 16, it is attached so that the air in the recess 16 does not leak to the outside, and the back partition member 58 divides the recess 16 in an airtight manner, and the back intake passage 53 and the back exhaust passage 55 can be formed such that air does not flow into each other.

  Thus, the U-turn type ventilation path 5 is formed by attaching the bottom cover 591 and the back cover 592 to the recesses 15 and 16. Therefore, the shape of the cabinet 1 can be simplified, and the time and labor required for manufacturing the cabinet 1 can be reduced. Further, by forming the bottom partition member 50 and the back partition member 58 on the bottom cover 591 and the back cover 592, the bottom cover 591 and the back cover 592 have slightly complicated shapes, but the structure of the entire refrigerator B is simplified. It is possible to reduce the labor required for manufacturing.

  In the above example, the cover member 59 is illustrated in which the bottom cover 591 and the back cover 592 are formed separately, but they may be formed integrally. Further, although the bottom partition member 50 is integrally formed with the bottom cover 591 and the back partition member 58 is integrally formed with the back cover 592, the bottom cover 591 may be formed separately. In this case, the bottom partition member 50 and the back partition member 58 are fixed to the cover member 59, fixed to the recesses 15 and 16, and both the cover member 59 and the recesses 15 and 16 are detachably attached. May be. Any one that can be formed so that the intake passage and the exhaust passage are hermetically sealed can be widely employed.

(Fourth embodiment)
FIG. 6 shows a cross-sectional view of still another example of the refrigerator according to the present invention. As shown in FIG. 6, a heater 74 is attached to the drain water evaporator 7. Other than that, it has the same structure as the refrigerator A shown in FIG. 1, FIG. 2, etc., and the same code | symbol is attached | subjected to the substantially same part. As shown in FIG. 6, a heater 74 for heating the air that has passed through the back exhaust passage 522 is attached to the upstream side of the evaporation fan 73 of the drain water evaporator 7 of the refrigerator C.

 When the Stirling refrigerator 2 is in normal operation (high load operation), heat is generated from the high temperature portion 22, and the refrigerant filled in the heat exchanger 4 is in contact with the high temperature portion 22 on the high temperature side. It is heated and evaporated by the evaporator 41 and flows into the high temperature side condenser 42. The refrigerant that has flowed into the high temperature side condenser 42 exchanges heat with the flowing air and liquefies and returns to the high temperature side evaporator 41. At this time, the high temperature side condenser 42 heats the incoming air and discharges it as high temperature dry air.

  When the internal temperature of the refrigerator C is stable or when the defrosting operation is performed, the Stirling refrigerator 2 is operated or stopped at a low load. When the Stirling refrigerator 2 is stopped, heat generation from the high temperature section 22 is reduced or eliminated, and the air passing through the high temperature side condenser 42 cannot be heated, and the drain water of the drain water evaporator 7 is evaporated. The ability to do this is reduced. Even when the outside air temperature is very low, the heat generated from the high temperature portion 22 of the Stirling refrigerator 2 is small, and the temperature of the air sent to the drain water evaporator 7 is low, so that the ability to evaporate the drain water is reduced.

  As described above, when the air cannot be sufficiently heated by the heat from the high-temperature part 22 of the Stirling refrigerator 2, the heater 74 is driven to heat the air and blown to the drain pan 71, thereby drain water evaporator. It is possible to prevent the drain water evaporation ability of 7 from being lowered. At this time, the driving of the heater 74 may determine the amount of heat generated corresponding to the operation of the Stirling refrigerator 2, and a temperature detecting means is disposed at a predetermined location in the back exhaust passage 522, The amount of heat generated corresponding to the temperature of air measured by the detection means may be determined. The flow rate of air passing through the heater 74 may also be used as a parameter when determining the amount of heat generated by the heater 74.

  In each of the above embodiments, the drain pan 71 employs a container having an open top with a bottom surface that is horizontal, but the drain water accumulates toward the portion directly exposed to high-temperature air blown from the evaporation fan 73. The bottom of the drain pan 71 may be inclined. Since the bottom of the drain pan 71 is inclined, even when the amount of drain water is small, high-temperature air can be efficiently blown onto the drain water, and the drain water can be easily evaporated accordingly.

 The refrigerator according to the present invention is not limited to the refrigerator shown in each of the above embodiments, and may have a plurality of features among the features of the refrigerator shown in the above embodiments.

  The refrigerator of the present invention can be applied to a refrigerator using a Stirling refrigerator as a cooling device.

It is a sectional side view of the refrigerator concerning this invention. It is a rear view of the refrigerator shown in FIG. It is a bottom view of the refrigerator shown in FIG. It is a sectional side view of the other example of the refrigerator concerning this invention. It is side sectional drawing of the further another example of the refrigerator concerning this invention. It is side sectional drawing of the further another example of the refrigerator concerning this invention.

Explanation of symbols

A Refrigerator 1 Cabinet 10 Machine room 101 Sealing member 11 Freezer room 111 Door 112 Internal cooling fan 12 Refrigerated room 121 Door 13 Packing 14 Grill 141 Filter 2 Stirling refrigerator 21 Low temperature part 22 High temperature part 3 Secondary refrigerant circulation circuit 31 Low temperature Side condenser 32 Low temperature side evaporator 33 Refrigerant flow pipe 4 Heat exchanger 41 High temperature side evaporator 42 High temperature side condenser 43 Refrigerant pipe 5 U-turn type air passage 50 Bottom partition member 51 Air inlet 52 Bottom air intake passage 53 Back air intake passage 54 U-turn part 55 Back exhaust path 56 Bottom exhaust path 57 Exhaust port 58 Back partition member 59 Cover member 591 Bottom cover 592 Back cover 6 Blower (blower fan)
7 Drain water evaporation device 71 Drain pan 72 Drain water draining member 73 Evaporating fan 74 Heater

Claims (4)

It is a refrigerator that cools the interior with a Stirling refrigerator,
A Stirling refrigerator provided at the back of the refrigerator;
A heat exchanger connected to the high temperature section of the Stirling refrigerator,
A U-turn type air passage formed continuously over the bottom and back of the cooler so as to introduce / lead outside air into the heat exchanger, and an intake port and an exhaust port formed in the front part of the bottom of the cooler;
An air blower disposed in the U-turn ventilation path and in the vicinity of the heat exchanger;
A cooler comprising a drain water evaporation device disposed on the exhaust side at the bottom of the U-turn type ventilation path.   The refrigerator according to claim 1, wherein the U-turn ventilation path includes a cover member integrally formed with a partition portion that partitions the intake side and the exhaust side.   The cooler according to claim 1, wherein the drain water evaporation device includes an evaporation blower that blows air on an exhaust side to a drain pan.   The said drain water evaporation apparatus is equipped with the heating apparatus for heating the air sprayed on a drain pan, The refrigerator of Claim 3 characterized by the above-mentioned.

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