JP2005257247A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator capable of reducing power consumption and storing foods in a long term by using a heat pipe in combination for cooling of a cooling chamber, thereby improving the cycle efficiency, further minimizing the load of a cooling chamber cooler to raise the evaporation temperature, and reducing the frost formation quantity to the cooler to keep a constant-temperature and high-humidity atmosphere. <P>SOLUTION: A refrigeration cycle is formed by a two-stage compressor 13, a freezing cooler 9 connected to a refrigerant passage switching valve provided on the outlet side of a condenser through a decompression device, and a decompression device and the cooling cooler 11 provided in parallel to the circuit of the freezing cooler. A suction pipe of the cooling cooler is introduced into the intermediate pressure part of a compressor case, so that the refrigerant is sucked to the high stage-side compression part in combination with the refrigerant sucked from the freezing cooler to the low stage-side compression part, compressed and discharged. A heat pipe cooling plate 15 cooled by the cooling force of the cooling cooler 11 is arranged in a storage space 2 cooled by forcedly circulating the cold air from the cooling cooler by a fan 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a refrigerator that controls the amount of refrigerant flowing into a refrigerator for refrigeration and refrigeration by a two-stage compression refrigeration cycle, and cools a refrigerator compartment by using a cooler and a heat pipe together.

  Conventionally, refrigerators that are widely used for home use generally have a freezing space that is cooled to about −18 to −20 ° C. and a refrigerator or vegetable storage space that is maintained at about +1 to + 5 ° C. In the type in which each of the refrigeration spaces is equipped with a cooler, the refrigerant flow to the coolers disposed in each cooling space is distributed and controlled by alternately switching the refrigerant flow paths, so that the temperature and temperature of the entire cooling space are controlled. The compressor is controlled according to the load such as the difference.

On the other hand, the refrigerant compressor currently used in the refrigerator-freezer on the market is a so-called single-stage compression system in which a single compression unit exists in the compressor case. As shown, a two-stage compressor (43) having a motor, a low-stage compression element (43a), and a high-stage compression element (43b) is provided in a sealed container, and a discharge pipe from the high-stage compression element (43a). An intermediate pressure expansion device (52) is connected to the outlet side of the condenser (49) connected to (55), and the discharge side of the low-stage compression element (43a) and the suction side of the high-stage compression element (43b) An intermediate pressure suction pipe (56) is connected, and an intermediate pressure evaporator (41) is connected between the intermediate pressure suction pipe (56) and the intermediate pressure expansion device (52), and a condenser (49 ) Between the low pressure expansion device (51) connected to the outlet side and the suction side (54) of the low-stage compression element of the two-stage compressor The low-pressure evaporator (49) is connected to the outlet, and the discharge side of the low-stage compression element (43a) and the suction side of the high-stage compression element (43b) are communicated with each other in the sealed container (43c). The idea of a two-stage compression refrigeration system that increases the accuracy of temperature control in the interior and makes the temperature of each part in the cabinet uniform, high efficiency, and low power consumption is disclosed (for example, Patent Document 1). reference).
JP 2001-74325 A

  In the refrigeration cycle described in Patent Document 1, cycle efficiency is improved by making the evaporation temperature of the intermediate pressure evaporator (41), which is a refrigeration cooler, higher than the low pressure evaporator (49), which is a refrigeration cooler. Is possible. However, since this prior art does not touch the cooling method in the storage chamber, naturally, the idea of maintaining the atmosphere of the refrigerated space at high humidity is not shown, but cooling of a general refrigerated space is performed by a cooler (41 ) (49) is a so-called fan cool cooling system in which the cool air generated in (49) is circulated and cooled in a blowing storage space by means of a fan. The stored foods of this product will continue to dry and are still not satisfactory for long-term storage.

  The present invention has been made in consideration of the above points, and by using a heat pipe in combination with the cooling of the refrigerating room, the cycle efficiency is improved and the load of the refrigerating room cooler is further reduced to increase the evaporation temperature. The object of the present invention is to provide a refrigerator that reduces the amount of frost on the cooler and keeps the room in a constant temperature and high humidity atmosphere, thereby reducing power consumption and allowing food to be stored for a long time.

  In order to solve the above problems, a refrigerator according to the present invention includes a compressor in which a compression element is composed of a low-stage compression section and a high-stage compression section, and an outlet side of a condenser that receives refrigerant discharged from the compressor. A refrigerant flow path switching valve provided in the refrigeration unit, a refrigeration cooler connected from the switching valve via a pressure reduction device, a pressure reduction device provided in parallel with the circuit of the refrigeration cooler, and a refrigeration cooler A refrigeration cycle is formed, the suction pipe of the refrigeration cooler is introduced into the intermediate pressure part of the compressor case, and the refrigerant is sucked into the lower stage compression part from the refrigeration cooler and merged with the refrigerant compressed and discharged. A heat pipe that is sucked into the stage-side compression section, compressed and discharged, and cooled by the cooling power of the refrigeration cooler to the storage space cooled by forcibly circulating the cold air generated by the refrigeration cooler with a fan A cooling body consisting of It is characterized in.

  With this configuration, both the refrigeration cooler and the refrigeration cooler can be set to an evaporating temperature corresponding to the cooling of each storage space, and the efficiency of the refrigeration cycle can be improved. The load on the refrigerator cooler can be further reduced to reduce power consumption. Further, by increasing the evaporation temperature of the refrigerant, the amount of frost on the refrigeration cooler is reduced, and the freshness of the food can be maintained for a long time while keeping the refrigeration room at a high humidity.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a refrigerator, and stores the inside of a refrigerator main body (1) which is a heat insulating box body in which a foam heat insulating material (4) is filled in a gap between an outer box (2) and an inner box (3). As a space, a refrigerator compartment (5) at the top, a vegetable compartment (6) below it, and a freezer compartment (7) at the bottom are arranged independently, respectively. The vegetable compartment (6) and the freezer compartment (7) An ice making chamber (8) and a multi-temperature switching chamber (not shown) are juxtaposed on both sides via a heat insulating partition wall, and a dedicated door is provided at each front opening of each storage chamber.

  At the rear of the freezing room (7), a cooling room is provided, and a freezing cooler (9) and a cooling fan (10) for the freezing room and ice making room are arranged, and on the back of the freezing room (5). Is equipped with a refrigeration temperature cooler (11) and a cooling fan (12) for cooling the refrigeration room and the vegetable room (6), and by driving a refrigerant compressor (13) installed in the machine room at the bottom of the main body, The cool air cooled by the coolers (9) and (11) is blown to the respective chambers by the rotation of the cooling fans (10) and (12), and the respective storage chambers are controlled to be cooled to a predetermined temperature.

  (15) is a cooling plate composed of heat pipes installed from the ceiling wall to the back wall of the inner box (3) inner surface constituting the refrigerating room (5), and heat conduction from the wall surface to the refrigerating room. The food stored in the refrigerator compartment is cooled directly by the heat pipe cooling plate (15) together with the cold air forcedly circulated by the cooler (11) and the cooling fan (12). .

  As shown in FIG. 2, this heat pipe cooling plate (15) is a heat pipe (16) in which a small amount of working fluid such as chlorofluorocarbon, alcohol or hydrocarbon refrigerant is enclosed in a long copper pipe sealed at both ends. Is attached to the surface of a thin metal plate (17) with good thermal conductivity. When a temperature difference occurs at both ends of the heat pipe (16), the heat of the low temperature part at one end moves to the other end. The temperature of the entire pipe is lowered, and one end of the heat pipe (16) is brought into contact with a low-temperature cooler (11) or placed at the cold air outlet (14a) from the duct (14). The heat pipe cooling plate (15) is cooled by heat conduction from (16) to the metal plate (17), and acts to directly cool the inside of the refrigerator compartment (3).

  As shown in FIG. 3, the heat pipe cooling plate (15) includes heat pipes (16a) and (16b) formed in a meandering manner in the vertical direction by continuing the horizontal portion and the arc-shaped portion. The upper and lower heat pipes (16a) and (16b) are connected to the upper and lower ends of the upper and lower meandering portions, respectively. By making it into a closed loop shape, the working fluid in the pipe is easily moved. At this time, if the heat pipe (16) is formed in a semicircular cross-section with a flat contact surface to the metal plate (17) surface, and is fixed to the metal plate surface (17) by brazing or the like, Heat contact efficiency can be improved by increasing the contact area with the metal plate surface (17).

  Therefore, for example, if the upper back of the heat pipe cooling plate (15) is in contact with the refrigeration cooler (11), the working fluid in the heat pipe (16) circulates in the direction of the arrow by heat transfer, The entire pipe cooling plate (15) is cooled to a temperature level substantially equal to that of the cooler (11).

  In the above embodiment, the heat pipe cooling plate (15) is described as having a structure in which the heat pipe (16) is attached to the surface of the thin metal plate (17). A so-called roll bond type in which a cooling plate is formed by polymerizing a good heat conductive plate such as aluminum may be used.

  In addition, the heat pipe (16) in a horizontal state such as a ceiling portion can be arranged with an appropriate inclination so that the working fluid inside can be easily moved and the cooling performance can be improved. Furthermore, the heat conductive sheet such as the metal plate (17) is extended to both side walls of the vegetable compartment (6), or, as shown in FIG. 1, between the refrigerator compartment (5) and the vegetable compartment (6). It is good also as a partition plate (18), and if it arrange | positions in this way, the inside of a vegetable compartment (6) can be cooled effectively in the state holding humidity by direct heat conduction.

  In addition, when the heat pipe cooling plate (15) is used as the partition plate (18) and the set temperature of one storage chamber is high, a heat insulating material (32) is provided on the surface of the one storage chamber. The heat pipe (16) should not be affected by heat.

  FIG. 4 is a schematic diagram showing a refrigeration cycle in the refrigerator of the present invention, wherein the compressor (13), the condenser (19), a three-way valve (20) which is a refrigerant flow switching device, and connected in parallel The refrigeration cooler (9) and the refrigeration cooler (11) are connected in an annular shape, and the refrigerant liquefied by the condenser (19) is passed through the three-way valve (20). Refrigeration cooler (9) or refrigeration cooler (11) is supplied via freezing capillaries (21) and refrigeration capillaries (22), respectively. And each storage chamber is cooled to a predetermined temperature by air circulation by the cold air fans (10) and (12).

  The evaporated refrigerant is returned to the compressor (13) again through the accumulator (23), and the refrigerant of this refrigeration cycle is carbonized such as isobutane with no destruction of the ozone layer and low global warming potential. Encloses a hydrogen-based refrigerant.

  The refrigerant compressor (13) is a reciprocating two-stage compression type in which a compression element is composed of a low-stage compression section (13a) and a high-stage compression section (13b), and the low-stage compression section (13a). The suction port is connected to the end of the suction pipe (24) connected via the accumulator (23) from the refrigeration cooler (9), and discharges the refrigerant gas compressed by the compression part (13a). The discharge port to be opened is opened in the sealed case (13c), and the discharge port of the high-stage compression section (13b) is connected to the discharge pipe (25) to the condenser (19).

  The accumulator (23) separates gas and liquid, stores the liquid refrigerant that could not be evaporated by the refrigeration cooler (9), sends out only the gaseous refrigerant, and puts the liquid refrigerant into the cylinder of the compressor (13). In this embodiment, it is provided only at the rear stage of the refrigeration cooler (9).

  The suction pipe (26) from the refrigeration cooler (11) is connected so as to be introduced into a space portion serving as an intermediate pressure stage in the sealed case (13c). Therefore, since the refrigerant sucked from the refrigeration cooler (11) does not flow directly into the cylinder of the compressor, it is not particularly necessary to provide an accumulator after the refrigeration cooler (11). Things can be used. Then, the refrigerant gas sucked from the suction pipe (26) on the refrigeration cooler side communicates with the refrigerant gas discharged from the discharge port of the low-stage compression section (13a), and the high-stage compression section (13b) It is configured to be sucked into and compressed by the suction port.

  The three-way valve (20) is provided on the outlet side of the condenser (19) that receives the discharge gas from the compressor (13), and the refrigerant flows to the refrigeration cooler (9) and the refrigeration cooler (11) side. The flow rate is controlled together with the path switching, and as shown in FIG. 5, in the valve case (28), the valve port A (29a) to the refrigeration cooler (9) side and the refrigeration side cooler (11) This is a three-way valve provided with a valve seat (29) having a valve opening B (29b), and a valve body (30) disposed on the valve seat (29).

  The valve body (30) extends in an arc shape over a predetermined length so as to correspond to the valve ports A (29a) and B (29b) on the rotation locus, and rotates from the center of the rotation shaft (30c). The groove A (30a) and the groove B (30b) having two V-shaped cross sections with different moving radii are formed on the lower surface of the thick step (30d) formed into a predetermined edge shape. The upper surface of the valve seat (29) and the valve body (30) are intimately polymerized, and are rotationally driven by 0 to 85 pulse steps by a stepping motor (not shown) provided on the upper portion.

  The three-way valve (20) rotates the valve body (30) with a pulse signal based on a refrigeration cycle control signal, and the groove A (30a) and the valve port A (29a) outside the rotation radius of the valve body at a predetermined pulse position. ) Are superposed vertically and communicated with each other, the refrigerant flowing into the valve case (28) from the inflow valve port (31) is opened at the open end of the thick-walled step (30d) in the groove A (30a). It enters into the V-shaped groove A (30a) from the edge, flows out from the valve port A (29a) communicating with the groove A, and is introduced into the refrigeration side capillary tube (21). It will evaporate.

  On the other hand, when the concave groove B (30b) and the valve port B (29b) on the inner side of the rotation radius communicate with each other, the refrigerant flowing into the concave groove B (30b) is refrigerated from the valve port B (29b) that communicates. It flows into the side capillary (22) and evaporates in the refrigeration cooler (11).

  Further, the concave groove B (30b) on the refrigeration side is formed such that the cross-sectional area thereof is enlarged as needed as the V-shaped groove moves from the rotating tip to the open end of the thick-walled step (30d). By rotating the valve body (30), the minimum and maximum flow opening area is communicated with the valve port B (29b), and the flow control and flow rate adjustment can be finely controlled. Can efficiently change the refrigerant flow rate linearly.

  The opening control of the three-way valve (20) is controlled by fully opening the valve opening to the refrigeration cooler (9) and the refrigeration side cooler (11), or by closing the refrigeration side valve opening. Various patterns can be selected, such as fully opening the side or restricting the valve opening on the refrigeration side to fully open the refrigeration side. In this embodiment, the refrigeration cooler (9) and the refrigeration cooler (11) Are connected in parallel, and there are two types of cooling control: simultaneous cooling on the freezer side and cooling only on the freezer side.

  Then, the refrigerant flowing out from the freezing side valve port A (29a) passes through the capillary tube (21) set so as to have an evaporation temperature corresponding to the cooling temperature in the freezing chamber (7), is reduced in pressure, and is cooled in the freezing cooler (9 ) For evaporating at about −30 ° C., and similarly for the refrigerating valve port B (29b), the evaporating temperature is set to be about −1 ° C. which is similar to the cooling temperature in the refrigerating chamber (5). The refrigerant flows into the capillary tube (22) and is sent to the refrigeration cooler (11) to evaporate.

  With the refrigerant flow control described above, the evaporation temperature of the refrigeration cooler (11) can be increased with a temperature difference from the freezing side, and the refrigeration space during normal operation forms the refrigeration chamber (5). Since the heat pipe cooling plate (15) arranged from the ceiling surface to the back wall surface of the box (3) is arranged over a wide range, the cooling of the refrigeration cooler (11) In addition to cooling by the cold air from the outlet (14a), the cooling operation is performed with the ceiling surface and the back surface of the inner box (3) as the cooling surfaces, and the cooling operation is performed almost continuously as described above. Even in a relatively high cooling temperature of about ° C., the inside of the refrigerator compartment (5) can be cooled to plus or minus 1 ° C. by direct cooling by the heat pipe cooling plate (15).

  At this time, the temperature difference between the heat pipe cooling plate (15) and room air is as small as 2 degrees, so the cooling plate surface (17) does not reach the dew point temperature and suppresses the occurrence of condensation. In addition, in order to prevent the indoor air from being dried, the room can be kept at a high humidity of 90% or more.

  If there is a possibility of condensation on the surface of the heat pipe cooling plate (15), such as when opening the refrigerator compartment door during high temperature and humidity, tilt the heat pipe cooling plate (15) on the ceiling to guide the dew. In addition, if a dew receiving member is disposed below the dew receiving member, the dew water can be treated without falling into the room.

  With the above cooling action, the refrigeration fan (12) provided in the upper part can supplement the cooling power in total and reduce the rotational speed of the refrigeration fan (12) as compared with the cooling time of the normal refrigeration room to reduce the amount of air blown. Yes, it contributes to power saving by blowing out from the back to the refrigerating room (5) and the low temperature room through the duct (14), and since the air volume is low due to the low rotation speed, strong cold air does not directly hit the food. Furthermore, drying is prevented, the air in the refrigerator compartment (5) is agitated, the temperature difference in the room is eliminated, a constant temperature and high humidity atmosphere with little cooling temperature and humidity fluctuation is achieved, and long-term storage in a fresh state Is possible.

  In addition, the refrigeration cooler (11) is disposed on the back of the refrigerating room (5), so that the air path loss for introducing the refrigerating room (5) by reducing the distance from the cooler to the space to be cooled. In combination with the natural flow of cold air directly from the cooling plate (15) provided on the ceiling or side wall as described above, the cooling body such as the cooling plate (15) and the room Due to a small temperature difference from the air temperature, it is possible to contribute to indoor cooling without condensation even at a relatively high cooler temperature.

  In addition, the refrigeration cooler (11) and the heat pipe cooling plate (15) on the wall surface hardly cause frost or condensation, so that periodic defrosting is unnecessary and stored food gets wet due to dew. In normal cooling operation, the temperature detected by a temperature sensor (not shown) provided in the refrigerator compartment (5) or the freezer compartment (7) and the indoor settings of the refrigerator compartment and the freezer compartment are provided. By making a correction calculation from the temperature and the operating conditions such as the compressor (13) and cooling fan (10) (12) at that time, and changing the compressor's refrigeration capacity according to the heat load in the storage room In the continuous operation of the refrigeration cycle, the refrigerator compartment (5) and vegetable compartment (6) on the high temperature side and the refrigerator compartment (7) and temperature switching room on the low temperature side are independent of each other. And set The temperature is kept cooled.

  Next, the operation of the refrigeration cycle will be described. When the compressor (13) is driven by turning on the power, the refrigerant gas that has been compressed and becomes high-temperature and high-pressure is discharged from the discharge pipe (25) to the condenser (19) and reaches the three-way valve (20). The three-way valve (20) can be set in various patterns as described above, but when the power is turned on, both the refrigerator compartment (5) and the freezer compartment (7) are in an uncooled state. A (29a) and B (29b) are fully opened, and the refrigerant is decompressed by the freezing capillary (21) and the refrigeration capillary (22), and the freezing cooler (9) and the wall surface cooling plate (15) Respectively flows into the pipe (16) and the refrigeration cooler (11).

  The refrigerant that has flowed into the refrigeration cooler (11) evaporates at -1 ° C, and the air temperature in the refrigeration chamber (5) is cooled to about 1 ° C by blowing cool air by the rotation of the cooling fan (12). Further, the heat pipe cooling plate (15) whose one end is brought into contact with the refrigeration cooler (11) is lowered in temperature under the influence of the heat, and the inside of the refrigeration chamber (5) is directly cooled by a drop of cold air due to heat conduction. Then, the cold air circulated in the refrigerator compartment (5) flows into the lower vegetable compartment (6), and cools the room at a slightly higher temperature than the refrigerator compartment while maintaining high humidity.

  The other refrigerant divided from the three-way valve (20) reaches the refrigeration cooler (9) through the second capillary tube (21) having a larger squeezing ratio than the refrigeration capillary tube (22), and has a low temperature of about −30 ° C. The freezing space such as the freezing room (7) and the ice making room (8) is cooled to a freezing temperature of −18 ° C. or less by the cooling fan (10). In order to eliminate the one-way flow of refrigerant to the refrigeration cooler (11) with low resistance by the capillary resistance for making a difference, the three-way valve (20) is designed to slightly restrict the refrigerant flow rate to the refrigeration side where the refrigerant flows easily. Control is performed so that the refrigerant flow rate to both the refrigerator and freezer is maintained in a well-balanced manner.

  The refrigerant from the refrigeration cooler (9) flows into the accumulator (23). If liquid refrigerant that could not be evaporated in the cooler remains, it is stored in the accumulator (23) Only the refrigerant is sucked from the suction pipe (24) into the lower stage compression section (13a) of the compressor (13). Further, the refrigerant evaporated in the refrigeration cooler (11) is introduced into the sealed case (13c), which is at an intermediate pressure of the compressor (13), through the suction pipe (26).

  Refrigerant gas and refrigeration for evaporating in the refrigeration cooler (9), sucked into the lower stage compression section (13a) of the compressor (13), compressed again and discharged into the case (13c) from the discharge port The refrigerant gas that has flowed from the cooler (11) into the intermediate pressure step portion of the sealed case (13c) merges and is sucked into the high-stage compression portion (13b), compressed, and discharged to the discharge pipe (25). Forming a refrigeration cycle led to the condenser (19).

  Therefore, according to the above configuration, the suction pipe (26) from the refrigeration cooler (11) is reduced as compared with the conventional case where the difference in evaporation temperature is not limited due to the pressure of the refrigeration cooler. By directly connecting to the intermediate pressure stage in the compressor case (13c), the evaporation temperature of the refrigeration cooler (11) can be increased to approximate the room cooling temperature, and the compressor input can be reduced. Can do. Furthermore, the combined use with the heat pipe cooling plate (15) causes the refrigerator compartment (5) to be directly cooled from the surrounding wall surface, increasing the cooling power and further reducing the load on the refrigerator for cooling (11). Since the cycle efficiency can be increased, the power consumption can be reduced.

  In addition, the direct cooling by the heat pipe cooling plate (15) can further increase the evaporation temperature of the refrigeration cooler (11) to reduce the temperature difference from the refrigeration space, and the refrigeration fan (12) Reduces the number of frost that adheres to the cooler (11) by reducing the number of revolutions of the product to prevent strong cold air from hitting the food. Can be held for a long time.

  The two-stage compressor (13) in the above embodiment has been described with the pressure in the compressor case (13c) being an intermediate pressure. However, the invention is not limited to this. The suction pipe from the cooler is communicated with the space inside the compressor case, and the suction pipe from the refrigeration cooler is connected to the connection part between the discharge port of the low-stage compression unit and the suction port of the high-stage compression unit. It may be. Similarly, as a high-pressure case, the suction pipe from the refrigeration cooler is connected to the suction port of the low-stage compression unit, and the suction pipe from the refrigeration cooler is connected to the discharge port of the low-stage compression unit and the high stage. You may make it connect to the connection part with the suction inlet of a side compression part, and may discharge the discharge gas from a high stage side compression part from the inside of a high pressure case to the discharge pipe to a condenser.

  ADVANTAGE OF THE INVENTION According to this invention, it can utilize for the refrigerator which improved cycle efficiency by the combined structure of a two-stage compression refrigerating cycle and a heat pipe cooling plate.

It is a longitudinal cross-sectional view of the refrigerator which shows one Embodiment of this invention. It is sectional drawing of the heat pipe cooling plate in the refrigerator compartment of FIG. It is a front view of the heat pipe cooling plate of FIG. It is a refrigerating cycle figure of the refrigerator in FIG. It is a top view which shows the detail of the principal part of the three-way valve in FIG. It is a freezing cycle figure of the conventional refrigerator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator main body 2 Outer box 3 Inner box 4 Heat insulating material 5 Refrigeration room 6 Vegetable room 7 Freezer room 8 Ice making room 9 Refrigeration cooler
10 Refrigeration fan 11 Refrigeration cooler 12 Refrigeration fan
13 Two-stage compressor 13a Low-stage compressor 13b High-stage compressor
13c Airtight case 14 Duct 14a Cold air outlet
15 Heat pipe cooling plate 16 Heat pipe 17 Metal plate
18 Partition plate 19 Condenser 20 Three-way valve
21 Capillary tube for refrigeration 22 Capillary tube for refrigeration 23 Accumulator
24 Refrigeration side suction pipe 25 Discharge pipe 26 Refrigeration side suction pipe
28 Valve case 29 Valve seat 29a Refrigeration side valve port A
29b Refrigeration side valve port B 30 Disc 30a Freezing side groove A
30b Refrigerated groove B 30c Rotating shaft 30d Thick step
31 Inlet valve port 32 Insulation

Claims (3)

  A compressor in which the compression element is composed of a low-stage compression unit and a high-stage compression unit, a refrigerant flow switching valve provided on the outlet side of the condenser that receives the refrigerant discharged from the compressor, and the switching A refrigeration cooler connected from a valve via a decompression device, a decompression device provided in parallel with the circuit of the refrigeration cooler, and a refrigeration cooler to form a refrigeration cycle, and suction of the refrigeration cooler A pipe is introduced into the intermediate pressure part of the compressor case, and the refrigerant that has been sucked into the low-stage side compression part from the refrigeration cooler and merged with the compressed and discharged refrigerant is sucked into the high-stage side compression part and compressed and discharged. A cooling body comprising a heat pipe cooled by the cooling power of the refrigeration cooler is disposed in a storage space cooled by forcibly circulating cold air generated by the refrigeration cooler with a fan. refrigerator.   The flow path of the working fluid in the heat pipe separated vertically is formed in a meandering manner in which the horizontal part and the circular arc part are continuous, and the upper end and the lower end of the upper and lower meandering parts are connected to each other. 2. The refrigerator according to claim 1, wherein the refrigerator has a closed loop shape. The end of a cooling plate formed by arranging a heat pipe on one surface of the good heat conductor sheet is brought into contact with the cooler and disposed on the ceiling and side walls of the refrigerator compartment surface. refrigerator.

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