JP2004085103A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator optimum for using a cooling medium with the state varied at a super-critical region at a high pressure side of a refrigeration cycle. <P>SOLUTION: In the refrigerator, the outline is constituted by a heat insulation box (1) and a front surface opening is openably closed by a heat insulation door. The refrigerator is provided with a refrigeration cycle in which a compressor (16) for compressing a CO<SB>2</SB>cooling medium, an air-cooling heat exchanger (17) in which the gaseous cooling medium compressed by this compressor and becoming high temperature/high pressure is air-cooled while the state is varied in the super-critical region, pressure reduction devices (22, 23) and a cooling unit (24) for cooling the storage room by the cooling medium pressure-reduced by this pressure reduction device to become the low temperature are subsequently and circulatingly connected by a cooling medium pipe (21) and are returned to the compressor. The pressure reduction device is constituted by connecting a capillary tube and an electric expansion valve in series. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a refrigerator for refrigerated storage in a refrigerator.
[0002]
[Prior art]
In a conventional refrigerator, the inside of a refrigerator is cooled by a cooler of a refrigeration cycle, and stored items are stored in the refrigerator. The refrigerant of the refrigeration cycle is generally a CFC-based refrigerant, and is liquefied in a condenser.
[0003]
[Problems to be solved by the invention]
By the way, in recent years, the use of chlorofluorocarbon-based refrigerants has been reduced, and the use of refrigerants other than chlorofluorocarbon-based refrigerants (for example, carbon dioxide) has also been studied in refrigerators. When such a refrigerant is used, the refrigerant may change its state in a supercritical region on the high pressure side of the refrigeration cycle and may not be liquefied. Therefore, in order to increase the expansion of the refrigerant in the pressure reducing device, the pressure reduction rate in the pressure reducing device and the compression ratio of the compressor are increased. As described above, when the decompression rate in the decompression device is increased, a large flow path loss is required in the decompression device, and it is difficult for one electric expansion valve to reduce the pressure to a predetermined pressure. In the case where heat radiation on the high pressure side is performed by air-cooled heat exchange, the pressure of the high pressure side refrigerant increases when the outside air temperature is high. Then, in order to reduce the pressure of the refrigerant after expansion to a predetermined pressure, the pressure difference becomes large. Therefore, if only the capillary tube is used, power consumption increases. Therefore, it is necessary to modify the structure of the conventional refrigerator, particularly the decompression device, so as to be optimal for a refrigerant that changes state in the supercritical region and does not liquefy.
[0004]
An object of the present invention is to solve the above-described problems, and an object of the present invention is to provide a refrigerator that is optimal for using a refrigerant that changes state in a supercritical region on a high pressure side of a refrigeration cycle.
[0005]
[Means for Solving the Problems]
The refrigerator of the present invention comprises a compressor (16) for compressing a CO ₂ refrigerant in a refrigerator whose outer shell is constituted by an insulating box (1) and whose front opening is opened and closed by an insulating door. An air-cooled heat exchanger (17), a decompression device (22, 23), in which the gaseous refrigerant that has become high temperature and high pressure is air-cooled while changing its state in a supercritical region, and is decompressed by this decompression device to a low temperature. A refrigeration cycle in which a cooler (24) for cooling the inside of the refrigerator with the cooled refrigerant is sequentially connected in an annular manner with a refrigerant pipe (21) and returns to the compressor. The decompression device connects a capillary tube and an electric expansion valve in series. It is characterized by comprising.
[0006]
Further, there is provided a dew-prevention pipe (19) for preventing dew at the frontage of the heat-insulating box, and the dew-prevention pipe is provided in a refrigerant circuit from the air-cooled heat exchanger of the refrigeration cycle to the pressure reducing device. May be.
[0007]
The electric expansion valve may be arranged downstream of the capillary tube.
[0008]
Further, the capillary tube may be arranged upstream of the electric expansion valve so that the expansion process in the supercritical region is performed by the capillary tube and the expansion process in the two-phase region is performed by the electric expansion valve.
[0009]
Also, a stepping motor (38) as a driving device for the electric expansion valve, which rotates the electric expansion valve in the opening direction when rotated in the forward direction and rotates the electric expansion valve in the closing direction when rotated in the reverse direction, and a control device for controlling the stepping motor. (41), wherein the motor-operated expansion valve and the stepping motor are provided in a storage, which is an internal space of the heat-insulated box, or in a heat-insulated wall of the heat-insulated box, and the control device is configured to control the motor-operated expansion valve. When the opening is changed, the stepping motor may be provided with means for energizing the stepping motor to perform normal rotation or reverse rotation, and when the change of the opening of the electric expansion valve is completed, stopping the energization to the stepping motor. is there.
[0010]
And the said electric expansion valve may be arrange | positioned at the cooler accommodating part in a storage | storage.
[0011]
Further, a high pressure side pipe (20a) of the internal heat exchanger (20) is provided in a high pressure side refrigerant circuit from the air cooling heat exchanger to the electric expansion valve, and a low pressure side refrigerant circuit from the cooler to the compressor is provided. A low-pressure side pipe (20b) of the internal heat exchanger that exchanges heat with the high-pressure side pipe of the internal heat exchanger, and the internal heat exchanger is embedded in the heat insulating wall of the heat insulating box. There is.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a refrigerator according to the present invention will be described with reference to FIGS. FIG. 1 is an explanatory diagram of a refrigerant circuit of a refrigerator according to an embodiment of the present invention. FIG. 2 is a diagram of a specific example of a refrigerant circuit of the refrigerator of FIG. FIG. 3 is a view of the anti-dew pipe in FIG. FIG. 4 is a front view of a capillary tube, an expansion valve, and a cooler. FIG. 5 is an input / output diagram of the control device. FIG. 6 is a flowchart of the operation of the stepping motor.
[0013]
The outer shell of the household refrigerator is constituted by the heat insulating box 1. The internal space of the heat-insulating box 1, that is, the inside of the refrigerator, is partitioned into a plurality of rooms (four in this embodiment) having different set temperatures, and a refrigerator room 6, a vegetable room 7, a freezer room 8 and a freezer room from the upper side. It is room 9. The front surfaces of the cooling chambers 6 to 9 are open, and the front openings are openably closed by heat insulating doors (not shown). Further, a rear side of the freezing room 9 is a machine room 11.
[0014]
The machine room 11 is provided with equipment for cooling the inside of the refrigerator, that is, a two-stage compression type compressor 16, an air-cooled heat exchanger 17, an air-cooled heat exchanger blower 18, and the like. The compressor 16 and the air-cooled heat exchanger 17 are connected by a refrigerant pipe 21 to form a refrigeration cycle, and CO ₂ (carbon dioxide) is used as a refrigerant of the refrigeration cycle. In this refrigeration cycle, as shown in FIG. 1, the compressor 16 returns from the first-stage discharge port 16 a to the second-stage inlet 16 b of the compressor 16 through the primary air-cooled heat exchange section 17 a of the air-cooled heat exchanger 17. From the first-stage cycle and from the second-stage discharge port 16c of the compressor 16, the secondary air-cooled heat exchange part 17b of the air-cooled heat exchanger 17 and the front end face of the heat insulating box 1 are sequentially piped. The first stage of the compressor 16 passes through the dew-prevention pipe 19, the high-pressure pipe 20a of the internal heat exchanger 20, the capillary tube 22, the electric expansion valve 23, the cooler 24, and the low-pressure pipe 20b of the internal heat exchanger 20. And a second-stage cycle returning to the inflow port 16d. The capillary tube 22 and the electric expansion valve 23 constitute a pressure reducing device. In the internal heat exchanger 20, the high-pressure side pipe 20a and the low-pressure side pipe 20b are in close contact with each other, and the relatively high-temperature refrigerant in the high-pressure side pipe 20a and the low-temperature refrigerant in the low-pressure side pipe 20b exchange heat. I do.
[0015]
Then, the cooler 24 has a low temperature, and lowers the temperature of the surrounding air. The cooler 24 is housed in a duct in the refrigerator of the heat insulating box 1, and cool air around the cooler 24 is circulated by the fan 28 in the refrigerator being blown into the refrigerator to cool the refrigerator. Can be. Thus, the inside of the refrigerator can be cooled by the cooler 24. In the duct accommodating the cooler 24, an electric expansion valve 23 and a stepping motor 38 as a driving device for the electric expansion valve 23 are arranged.
[0016]
Further, the area from the discharge port 16c of the compressor 16 to the electric expansion valve 23 is on the high pressure side of the refrigeration cycle, and the area from the electric expansion valve 23 to the inlet 16d of the compressor 16 is on the low pressure side of the refrigeration cycle. A temperature sensor 34 for detecting the temperature inside the refrigerator (in this embodiment, the temperature of the freezing compartment 8 which is a cooling room) and a cooler outlet which is a cooler outlet temperature detecting means for detecting the outlet temperature of the cooler 24. A temperature sensor 37 is provided. The electric expansion valve 23 is driven by a stepping motor 38. When the stepping motor 38 rotates forward, the opening degree of the electric expansion valve 23 increases. Conversely, when the stepping motor 38 rotates reversely, the electric expansion valve 23 opens. The degree decreases. Since the temperature of the electric expansion valve 23 is lowered by the refrigerant, the electric expansion valve 23 and the stepping motor 38 are installed in the refrigerator or the heat insulating wall of the heat insulating box 1 so as not to be heated by the outside air. Further, the internal heat exchanger 20 is installed in the heat insulating wall of the heat insulating box 1 and minimizes heat absorption from the outside and heat radiation to the outside.
[0017]
Further, as shown in FIG. 5, the refrigerator is provided with a control device 41, and the control device 41 is constituted by a microcomputer or the like. Various electrical components are connected to the control device 41. Particularly, as electrical components for controlling the stepping motor 38 and the like, the cooler outlet temperature sensor 37 and the in-compartment temperature sensor 34 are provided on the input side. The stepping motor 38 and the compressor 16 are connected to the output side. Note that various setting values are stored in a storage unit (ROM, RAM, or the like) of the control device 41, and a timer (not shown) is built in. Further, the control device 41 performs various controls (for example, temperature control in the refrigerator) in addition to the control of the stepping motor 38.
[0018]
In the refrigerator according to the embodiment configured as described above, when the compressor 16 operates, the gaseous refrigerant (CO ₂ ) is compressed in the first stage of the compressor 16 to become a high-temperature and high-pressure gaseous refrigerant, and air-cooled heat exchange. In the primary air-cooling heat exchange section 17 a of the heat exchanger 17, the air is cooled by the air from the air-cooling heat exchanger blower 18, the temperature is reduced, and the air returns to the compressor 16.
[0019]
Then, the refrigerant is further compressed in the second stage of the compressor 16 to become a high-temperature and high-pressure gaseous refrigerant, and is air-cooled by air from the air-cooling heat exchanger blower 18 in the secondary air-cooling heat exchanger 17 b of the air-cooling heat exchanger 17. Then, while changing the state in the supercritical region, the temperature of the refrigerant drops to near the atmospheric temperature (that is, room temperature which is the temperature of the room where the refrigerator is installed). The refrigerant that has dropped to around room temperature flows into the dew-prevention pipe 19. As described above, the dew-prevention pipe 19 is provided along the frontage of the heat-insulating box 1. However, since the temperature of the refrigerant in the dew-prevention pipe 19 gradually decreases, the cooling chambers 6 to 9 are formed. (That is, the order of decreasing the temperature of the cooling chambers 6 to 9). In this embodiment, the freezing compartment 8 and the freezing compartment 9 have the lowest temperature at substantially the same temperature, and the cooling compartment 6 having the highest temperature in the refrigerator compartment 6 is the vegetable compartment 7. Therefore, as shown in FIG. 3, the dew-prevention pipe 19 includes, in order from the refrigerant inflow side, the right side of the freezing room 8, the right side, the lower side, the left side, the upper side of the freezing room 9, the lower side of the freezing room 8, The left side, the upper side, and then turned back, the lower side, the left side of the vegetable compartment 7, the left side, the upper side, the right side, the lower side of the refrigerator compartment 6, and then turned back, passed through the upper side, the right side of the vegetable room 7, to the internal heat exchanger 20. It is flowing out. In this way, the dew-prevention pipe 19 goes around the freezing compartments 8 and 9 first, then the refrigerator compartment 6 and then around the vegetable compartment 7 as much as possible.
[0020]
Next, the refrigerant that has exited the dew-prevention pipe 19 is cooled by the refrigerant returned from the cooler 24 in the internal heat exchanger 20, and then depressurized through the capillary tube 22 and the electric expansion valve 23 which are pressure reducing devices. , The temperature drops. The expansion process of the refrigerant in the supercritical region is performed in the capillary tube 22, and the expansion process of the refrigerant in the two-phase region of gas and liquid is performed in the electric expansion valve 23. Then, the low-temperature refrigerant from the electric expansion valve 23 flows into the cooler 24 and lowers the temperature of the air around the cooler 24. The air whose temperature has been lowered by the cooler 24 is circulated in the refrigerator by the fan 28 in the refrigerator, and cools the cooling chambers 6 to 9. The refrigerant flowing out of the cooler 24 exchanges heat with the refrigerant on the high pressure side in the internal heat exchanger 20 and returns to the inlet 16 d of the compressor 16 after the temperature rises.
[0021]
The control device 41 determines whether or not the inside temperature (cooling room temperature) detected by the inside temperature sensor 34 has reached the cooling room set temperature set in the control device 41, and the inside temperature is cooled. When the temperature is equal to or lower than the chamber set temperature, the compressor 16 is stopped. On the other hand, when the internal temperature exceeds the cooling chamber set temperature, the compressor 16 is operated and the cooler 24 cools the internal space. Under the control of the control device 41, the air-cooling heat exchanger blower 18 and the in-compartment fan 28 operate substantially in conjunction with the compressor 16, and start operating together with the compressor 16. When the compressor 16 stops, there is a slight delay. Has stopped.
[0022]
By the way, since the electric expansion valve 23 is disposed downstream of the capillary tube 22, the outlet temperature of the cooler 24 can be controlled by adjusting the opening of the electric expansion valve 23. The opening of the electric expansion valve 23 is changed by a stepping motor 38.
[0023]
Then, after the compressor 16 has been operated and is in a steady (equilibrium) state, the outlet temperature of the cooler 24 detected by the cooler outlet temperature sensor 37 is equal to the set value preset in the storage unit of the control device 41. Thus, the opening of the electric expansion valve 23 is controlled. The operation flow of the stepping motor 38 at this time will be described based on the flowchart of FIG.
[0024]
In step 1, the control device 41 samples (obtains) the detection value of the cooler outlet temperature sensor 37, compares the detected value with the cooler outlet temperature and a set value, and determines whether the cooler outlet temperature is low. Goes to step 2. Then, in step 2, the control device 41 energizes the stepping motor 38 to rotate forward so as to increase the opening of the electric expansion valve 23, and returns to step 1.
[0025]
On the other hand, if the cooler outlet temperature is high in step 1, go to step 4. Then, in step 4, the control device 41 reduces the opening of the electric expansion valve 23 by energizing the stepping motor 38 to rotate in the reverse direction, and returns to step 1.
[0026]
When the cooler outlet temperature becomes substantially equal to the set value in Step 1, the change of the opening degree of the electric expansion valve 23 is finished, and the process goes to Step 3. Then, in step 3, the control device 41 stops energizing the stepping motor 38 and returns to step 1.
[0027]
In this manner, (1) when increasing the opening of the electric expansion valve 23, the control device 41 energizes the stepping motor 38 to rotate forward.
(2) When reducing the degree of opening of the electric expansion valve 23, the control device 41 energizes the stepping motor 38 to rotate in the reverse direction.
(3) When the change of the opening degree of the electric expansion valve 23 ends, the control device 41 stops energizing the stepping motor 38. In the conventional stepping motor 38, power is supplied even when the opening of the electric expansion valve 23 is maintained. In this way, when electricity is supplied, heat is generated by this electricity supply, so that the temperatures of the stepping motor 38 and the electric expansion valve 23 increase, and the refrigerant flowing through the electric expansion valve 23 and the like is heated. As a result, the cooling efficiency of the refrigeration cycle decreases. Further, since the time during which the opening of the electric expansion valve 23 is maintained is generally longer than the time during which the opening of the electric expansion valve 23 is changed, the opening is maintained as in the embodiment. When the power supply is stopped during the operation, the power consumption of the electric expansion valve 23 can be greatly reduced, and the rise in temperature in the refrigerator can be suppressed.
[0028]
As described above, in the refrigerator of the embodiment, the refrigerant can be largely reduced in pressure by both the capillary tube 22 and the electric expansion valve 23. Moreover, since the electric expansion valve 23 is provided on the downstream side of the capillary tube 22, the outlet temperature of the cooler 24 can be controlled accurately.
In addition, the stepping motor 38 and the electric expansion valve 23 are provided in the storage or the heat insulating wall of the heat insulating box 1, and are less exposed to heat outside the heat insulating box 1 and are less likely to be heated. In addition, when the change of the opening degree of the electric expansion valve 23 is completed, the energization to the stepping motor 38 is stopped. Therefore, there is no energization when the opening degree of the electric expansion valve 23 is maintained, and the heating by the energization is prevented. be able to. Further, the power consumption of the electric expansion valve 23 can be significantly reduced, and the temperature inside the refrigerator can be suppressed from rising.
Further, since the electric expansion valve 23 is disposed in the cooler housing portion housing the cooler 24, it is easy to repair the electric expansion valve 23 when it breaks down. Easy recovery. In addition, the efficiency of the assembling work is improved.
[0029]
As described above, the control device 41 (1) means for energizing the stepping motor to rotate forward or reverse when changing the opening of the electric expansion valve, and (2) controlling the opening of the electric expansion valve. When the change is completed, a means for stopping the current supply to the stepping motor is provided.
As described above, the control device 41 includes, in addition to the above-described means, means for executing each action corresponding to each action to be executed. Also, not all means need be provided.
[0030]
As described above, the embodiments of the present invention have been described in detail. However, the present invention is not limited to the above embodiments, and various modifications may be made within the scope of the present invention described in the appended claims. It is possible to do. Modification examples of the present invention are exemplified below.
(1) The electric expansion valve is driven by a stepping motor, but may be driven by another driving device.
[0031]
(2) The type and structure of the refrigerator can be appropriately selected, but it is preferably for household use, and the interior of the refrigerator is partitioned into at least three temperature zones (that is, a refrigerator room, a freezer room, and a vegetable room). . Further, the refrigerator can include not only a refrigerator but also a freezer.
(3) Although the capillary tube is arranged on the upstream side of the electric expansion valve, it can be arranged on the downstream side of the electric expansion valve.
(4) In this embodiment, the compressor is of a two-stage compression type, but may be of a one-stage compression type. In the case of the single-stage compression type, the refrigeration cycle does not include the first-stage cycle but only the second-stage cycle.
[0032]
(5) Although the internal heat exchanger 20 is provided in this embodiment, the capillary tube 22 and the refrigerant pipe 21 on the low pressure side of the refrigeration cycle are brought into close contact with each other to perform the function of the internal heat exchanger 20. It is also possible to make it work.
(6) The operation flow of the stepping motor can be changed as appropriate.
[0033]
【The invention's effect】
According to the present invention, we use CO ₂ refrigerant, the refrigerant circuit of the high-pressure side of the refrigeration cycle, the refrigerant is changed condition in the supercritical region. Therefore, although the decompression rate in the decompression device is large, by connecting the capillary tube and the electric expansion valve in series, the pressure can be surely reduced and the power consumption can be reduced.
[0034]
In addition, the dew-prevention pipe is provided in the refrigerant circuit from the air-cooled heat exchanger of the refrigeration cycle to the decompression device, so that the refrigerant from the air-cooled heat exchanger can prevent the front opening of the heat insulating box from being exposed. At the same time, the refrigerant flowing through the dew-prevention pipe can be cooled by the cold heat in the refrigerator, and the cooling efficiency of the refrigeration cycle can be improved.
[0035]
The electric expansion valve is arranged on the downstream side of the capillary tube, so that the refrigerant decompressed by the capillary tube can be expanded while being controlled by the electric expansion valve. Therefore, the refrigeration cycle can be brought into an appropriate state. As a result, power consumption can be reduced.
[0036]
Further, the electric expansion valve and the stepping motor are provided in a storage, which is the internal space of the heat-insulating box, or in the heat-insulating wall of the heat-insulating box, and the refrigerant flowing through the electric expansion valve due to heat outside the heat-insulating box. It can be prevented from being heated. In addition, when the change of the opening degree of the electric expansion valve is completed, the power supply to the stepping motor is stopped, and the heating by the power supply can be prevented as much as possible. As a result, when the opening degree of the electric expansion valve is maintained, it is possible to prevent the temperature of the inside of the refrigerator and the refrigerant from rising as much as possible by the energization of the stepping motor. In addition, power consumption of the electric expansion valve can be reduced.
[0037]
Further, since the electric expansion valve is disposed in the cooler storage portion in the refrigerator, the electric expansion valve can be easily repaired, and the parts can be easily collected at the time of recycling. Moreover, assembling workability is improved. In addition, it is possible to prevent the refrigerant flowing through the electric expansion valve from being heated from the outside as much as possible.
[0038]
Since the internal heat exchanger is embedded in the heat insulating wall of the heat insulating box, heat absorption from the outside and heat radiation to the outside can be suppressed as much as possible. As a result, the cooling capacity increases, and the power consumption can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a refrigerant circuit of a refrigerator according to an embodiment of the present invention.
FIG. 2 is a diagram of a specific example of a refrigerant circuit of the refrigerator of FIG.
FIG. 3 is a view of a dew-prevention pipe in FIG. 2;
FIG. 4 is a front view of a capillary tube, an expansion valve, and a cooler.
FIG. 5 is an input / output diagram of a control device.
FIG. 6 is a flowchart of the operation of the stepping motor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Insulated box 16 Compressor 17 Air-cooled heat exchanger 19 Dew-prevention pipe 20 Internal heat exchanger 20a High-pressure side pipe 20b of internal heat exchanger Low-pressure side pipe 21 of internal heat exchanger 21 Refrigerant pipe 22 Capillary tube (decompression device)
23 Electric expansion valve (pressure reducing device)
24 cooler 38 stepping motor (drive device for electric expansion valve)
41 Control device

Claims (7)

In a refrigerator in which the outer shell is formed of an insulated box and the front opening of which is opened and closed by an insulated door,
A compressor that compresses the CO ₂ refrigerant, an air-cooled heat exchanger in which the high-temperature and high-pressure gaseous refrigerant compressed by the compressor is air-cooled while changing its state in the supercritical region, a decompression device, and decompressed by the decompression device A refrigeration cycle that connects a cooler that cools the inside of the refrigerator with refrigerant that has become low temperature in order through a refrigerant pipe and returns to the compressor,
The refrigerator, wherein the pressure reducing device is configured by connecting a capillary tube and an electric expansion valve in series. A dew-prevention pipe for preventing dew at the frontage of the heat-insulating box,
The refrigerator according to claim 1, wherein the dew-prevention pipe is provided in a refrigerant circuit from an air-cooled heat exchanger of a refrigeration cycle to a pressure reducing device. 3. The refrigerator according to claim 1, wherein the electric expansion valve is arranged downstream of the capillary tube. The capillary tube is arranged upstream of an electric expansion valve so that the expansion process in the supercritical region is performed by a capillary tube, and the expansion process in the two-phase region is performed by an electric expansion valve. Item 3. The refrigerator according to Item 1 or 2. A stepping motor as a drive device of the electric expansion valve, which rotates the electric expansion valve in the opening direction when rotated forward and rotates the electric expansion valve in the closing direction when rotated reversely;
And a control device for controlling the stepping motor,
The motor-operated expansion valve and the stepping motor are provided in a chamber that is an internal space of the heat-insulating box, or provided in an insulating wall of the heat-insulating box.
When changing the opening of the electric expansion valve, the control device energizes the stepping motor to perform normal rotation or reverse rotation, and when the change of the opening of the electric expansion valve is completed, The refrigerator according to any one of claims 1 to 4, further comprising: means for stopping energization. The refrigerator according to any one of claims 1 to 5, wherein the motor-operated expansion valve is disposed in a cooler storage portion in the refrigerator. The high-pressure side pipe of the internal heat exchanger is provided in the high-pressure side refrigerant circuit from the air-cooled heat exchanger to the electric expansion valve, and the high-pressure side of the internal heat exchanger is provided in the low-pressure side refrigerant circuit from the cooler to the compressor. Provide the low pressure side pipe of the internal heat exchanger that exchanges heat with the side pipe,
The refrigerator according to any one of claims 1 to 6, wherein the internal heat exchanger is embedded in a heat insulating wall of the heat insulating box.

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