JP2010249458A - Refrigerant circuit device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerant circuit device capable of preventing a high pressure abnormality from occurring at the start of a compressor and causing damage to the compressor and the like. <P>SOLUTION: The refrigerant circuit device includes an exclusive cooling circuit 20 comprising a compressor 21, a condenser 22, a capillary tube 23, and an evaporator 24 connected to one another by refrigerant piping 25. The refrigerant circuit device includes a bypass passage 50 disposed to branch from part of the refrigerant piping 25 connected to the inlet side of the capillary tube 23 and to join with part of the refrigerant piping 25 extending from the capillary tube 23 to the evaporator 24; and a bypass valve 51 disposed in the bypass passage 50 to permit the refrigerant to pass through the bypass passage 50 by being open if its own upstream pressure is equal to or greater than a predetermined threshold value and to regulate the refrigerant from passing through the bypass passage 50 by being closed if the upstream pressure is less than the threshold value. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a refrigerant circuit device, and more particularly to a refrigerant circuit device that is applied to, for example, a vending machine and that cools or heats the internal atmosphere of a product container defined in a vending machine body. is there.

  2. Description of the Related Art Conventionally, as a refrigerant circuit device applied to, for example, a vending machine, one having a refrigerant circuit is known. As such a refrigerant circuit, a circuit having a cooling dedicated path and a heating path is known.

  The dedicated cooling circuit is configured by sequentially connecting an evaporator, a compressor, a condenser, and a capillary tube through a refrigerant pipe.

  The evaporator is disposed inside the commodity storage of the vending machine. This evaporator cools the internal air (internal atmosphere) of the product storage box by the supplied refrigerant passing through a predetermined flow path and evaporating.

  The compressor is disposed in the machine room inside the vending machine main body and outside the product container. The compressor sucks the refrigerant evaporated by the evaporator and compresses the sucked refrigerant into a high temperature and high pressure state. Are discharged.

  The condenser is disposed in the machine room in the same manner as the compressor, introduces the refrigerant compressed by the compressor through the refrigerant pipe, and heats the ambient air by condensing the introduced refrigerant, that is, into the ambient air. It dissipates heat.

  The capillary tube is disposed in the machine room in the same manner as the compressor and the condenser, and decompresses the refrigerant condensed in the condenser to adiabatic expansion.

  The heating path is a path having an internal heat exchanger and an external heat exchanger. The internal heat exchanger is disposed inside the commodity storage. In more detail, it is arrange | positioned inside the goods storage container which accommodates the goods used as the heating object. In this internal heat exchanger, the inlet side is connected to a branch pipe branched from a refrigerant pipe connecting a compressor and a condenser constituting a cooling exclusive path. Such an in-compartment heat exchanger heats the internal air of the product storage container in which the refrigerant is compressed by introducing the refrigerant compressed by the compressor through the branch pipe and condensing the introduced refrigerant.

  The external heat exchanger is connected to the pipe connected to the outlet side of the internal heat exchanger, and the pipe provided in such a manner that it joins the refrigerant pipe connecting the condenser and the capillary tube. The exit side is connected. Such an external heat exchanger introduces the refrigerant condensed in the internal heat exchanger and causes the introduced refrigerant to exchange heat with ambient air to dissipate heat.

  In such a refrigerant circuit, a cooling electromagnetic valve and a heating electromagnetic valve are provided in the refrigerant piping from the compressor to the condenser and the piping from the compressor to the internal heat exchanger, respectively. While the cooling solenoid valve opens when performing a cooling operation to cool the internal atmosphere of all the commodity containers provided with the evaporator, while allowing the refrigerant compressed by the compressor to flow to the condenser, In the case of other operations, the operation is closed to restrict the refrigerant compressed by the compressor from flowing to the condenser. On the other hand, the heating solenoid valve is opened when performing a heat pump operation that heats the internal atmosphere of any of the product storage units provided with the internal heat exchanger and cools the internal atmosphere of the other product storage units, While the refrigerant compressed by the compressor is allowed to flow to the internal heat exchanger, it is closed in other operations and the refrigerant compressed by the compressor is allowed to flow to the internal heat exchanger. It is something to regulate.

  When the cooling operation is performed, the refrigerant flows only through the cooling dedicated path, and when the heat pump operation is performed, the refrigerant flows through the heating path and a part of the cooling dedicated path (for example, Patent Document 1).

JP 2005-227833 A

  By the way, in the refrigerant circuit device described above, since the capillary tube is used as the expansion mechanism, the flow path resistance cannot be varied, and when the compressor is started up, the high pressure from the compressor to the capillary tube, that is, the upstream side of the capillary tube. As a result, the pressure in the side region suddenly rises and a high pressure abnormality that becomes abnormally high occurs. When such a high pressure abnormality occurs, a large load is applied not only to the refrigerant pipe but also to the compressor, and the compressor or the like may be damaged.

  In view of the above circumstances, an object of the present invention is to provide a refrigerant circuit device that can prevent a compressor or the like from being damaged due to a high-pressure abnormality when the compressor is started.

  In order to achieve the above object, a refrigerant circuit device according to claim 1 of the present invention includes a compressor that compresses a refrigerant, a condenser that condenses the refrigerant compressed by the compressor, and the refrigerant that is condensed by the condenser. In the refrigerant circuit device having a dedicated cooling circuit configured by sequentially connecting a capillary tube for adiabatic expansion of the refrigerant and an evaporator for evaporating the refrigerant adiabatically expanded by the capillary tube through a refrigerant pipe, the inlet side of the capillary tube A bypass path that is branched in the middle of the refrigerant pipe connected to the refrigerant pipe and joined in the middle of the refrigerant pipe from the capillary tube to the evaporator; When the side pressure is greater than or equal to a predetermined threshold value, it opens to allow the refrigerant to pass through the bypass path, while the upstream pressure is If less than the threshold is closed, characterized in that a bypass valve for regulating that the bypass path refrigerant passes.

  The refrigerant circuit device according to claim 2 of the present invention is the above-described refrigerant circuit device according to claim 1, wherein the internal heat exchanger for introducing and condensing the refrigerant compressed by the compressor includes the internal heat exchanger. An external heat exchanger that radiates the condensed refrigerant, and a heating path configured to send the refrigerant radiated by the external heat exchanger to the capillary tube, and when performing a cooling operation, While the refrigerant compressed by the compressor is allowed to flow to the condenser and is restricted from flowing to the internal heat exchanger, when the heat pump operation is performed, the refrigerant compressed by the compressor And a valve unit that restricts flow to the condenser and allows flow to the internal heat exchanger.

  According to the refrigerant circuit device of the present invention, the bypass path is arranged so as to branch from the middle of the refrigerant pipe connected to the inlet side of the capillary tube and merge into the refrigerant pipe from the capillary tube to the evaporator. The bypass valve disposed in the bypass path is opened when its upstream pressure exceeds a predetermined threshold value, and allows the refrigerant to pass through the bypass path. When the pressure is less than the threshold value, the refrigerant is closed and the passage of the refrigerant through the bypass path is restricted. Therefore, it is possible to avoid the occurrence of a high pressure abnormality in the high pressure side region of the refrigerant circuit when the compressor is started. it can. Therefore, there is an effect that it is possible to prevent the compressor or the like from being damaged due to a high-pressure abnormality when the compressor is started.

FIG. 1 is a sectional view showing a case where an internal structure of a vending machine to which a refrigerant circuit device according to an embodiment of the present invention is applied is viewed from the front. FIG. 2 shows the internal structure of the vending machine shown in FIG. 1, and is a cross-sectional side view of the right commodity storage. FIG. 3 is a conceptual diagram conceptually showing the cooling and heating apparatus according to the embodiment of the present invention. FIG. 4 is a conceptual diagram conceptually showing the flow of the refrigerant when performing the cooling operation. FIG. 5 is a conceptual diagram conceptually showing the flow of the refrigerant when the heat pump operation is performed. FIG. 6 is a conceptual diagram conceptually showing the movement of the refrigerant when the compressor is started.

  Exemplary embodiments of a refrigerant circuit device according to the present invention will be explained below in detail with reference to the accompanying drawings.

  FIG. 1 is a sectional view showing a case where an internal structure of a vending machine to which a refrigerant circuit device according to an embodiment of the present invention is applied is viewed from the front. The vending machine illustrated here includes a main body cabinet 1.

  The main body cabinet 1 has a rectangular shape with an open front surface. The main body cabinet 1 is provided with three independent commodity containers 3 partitioned by, for example, two heat insulating partition plates 2 in a side-by-side manner. This product storage 3 is for storing products such as canned beverages and beverages containing plastic bottles while maintaining a desired temperature, and has a heat insulating structure.

  FIG. 2 shows the internal structure of the vending machine shown in FIG. 1, and is a cross-sectional side view of the right commodity storage. Here, the internal structure of the right product storage 3 (hereinafter also referred to as the right storage 3a) is shown, but the central product storage 3 (hereinafter also referred to as the intermediate storage 3b) and the left product storage 3 are shown. The internal structure (hereinafter also referred to as the left warehouse 3c as appropriate) has substantially the same configuration as the right warehouse 3a. In the present specification, the right side indicates the right side when the vending machine is viewed from the front, and the left side indicates the left side when the vending machine is viewed from the front.

  As shown in FIG. 2, an outer door 4 and an inner door 5 are provided on the front surface of the main body cabinet 1. The outer door 4 is for opening and closing the front opening of the main body cabinet 1, and the inner door 5 is for opening and closing the front surface of the commodity storage 3. The inner door 5 is divided into upper and lower parts, and the upper door 5a opens and closes when a product is replenished.

  The product storage 3 is provided with a product storage rack 6, a carry-out mechanism 7 and a carry-out shooter 8. The commodity storage rack 6 is for storing commodities in a manner arranged in the vertical direction. The carry-out mechanism 7 is provided at the lower part of the product storage rack 6 and is used to carry out the products at the bottom of the product group stored in the product storage rack 6 one by one. The carry-out shooter 8 is for guiding the product carried out from the carry-out mechanism 7 to the product take-out port 4 a provided in the outer door 4.

  FIG. 3 is a conceptual diagram conceptually showing the refrigerant circuit device according to the embodiment of the present invention. The refrigerant circuit device exemplified here includes a cooling dedicated path 20 and a heating path 30, and includes a refrigerant circuit 10 in which a refrigerant (carbon dioxide) is sealed.

  The cooling dedicated path 20 is configured by sequentially connecting a compressor 21, a condenser 22, a capillary tube 23, and an evaporator 24 through a refrigerant pipe 25.

  The compressor 21 is disposed in the machine room 9 as shown in FIG. The machine room 9 is a room inside the main body cabinet 1, partitioned from the product storage 3 and below the product storage 3. The compressor 21 sucks the refrigerant through the suction port, compresses the sucked refrigerant to be in a high-temperature and high-pressure state (high-temperature and high-pressure refrigerant), and discharges it from the discharge port.

  As shown in FIG. 2, the condenser 22 is disposed in the machine room 9 similarly to the compressor 21. The condenser 22 condenses the refrigerant that passes therethrough. More specifically, the refrigerant compressed by the compressor 21 and discharged from the discharge port and sent out through the refrigerant pipe 25 is condensed by exchanging heat with ambient air. In the vicinity of the condenser 22, an external fan B1 is provided.

  As shown in FIG. 2, the capillary tube 23 is disposed in the machine room 9 similarly to the compressor 21 and the condenser 22. The capillary tube 23 is for adiabatic expansion by depressurizing the refrigerant passing therethrough.

  A plurality (three in the illustrated example) of the evaporators 24 are provided, which are disposed in the lower internal area of each commodity storage 3 and on the front side of the rear duct D (see FIG. 2). The refrigerant pipe 25 connecting the evaporator 24 and the capillary tube 23 is branched into three by a distributor 26 provided in the middle thereof, and the evaporator 24 (hereinafter, right evaporation) provided in the right warehouse 3a. The evaporator 24a (also referred to as the evaporator 24a), the evaporator 24 (also referred to hereinafter as the middle evaporator 24b) disposed in the intermediate store 3b, and the evaporator 24 ( Hereinafter, they are respectively connected to the inlet side of the left evaporator 24c). The evaporator 24 evaporates the passing refrigerant and cools the internal air (internal atmosphere) of the commodity storage 3.

  Further, in the refrigerant pipe 25, low pressure side solenoid valves 271, 272, 273 and expansion mechanisms 281, 282, 283 are provided on the way from the distributor 26 to the right evaporator 24a, the middle evaporator 24b, and the left evaporator 24c, respectively. Are provided. The low pressure side solenoid valves 271, 272, and 273 are valve bodies that can be opened and closed. If it is closed, the passage of the refrigerant is restricted. The expansion mechanisms 281, 282, and 283 are, for example, capillary tubes, and are for adiabatically expanding the refrigerant that passes therethrough.

  The refrigerant pipe 25 connected to the outlet side of the middle evaporator 24b and the left evaporator 24c joins at the first junction P1 on the way, and further the refrigerant pipe 25 connected to the outlet side of the right evaporator 24a The two merge points P2 are merged and connected to the compressor 21.

  The heating path 30 includes an internal heat exchanger 31 and a gas cooler 32, which are connected by a heat radiating pipe 34 and connected to the cooling dedicated path 20 by a branch pipe 33 and a return pipe 35. .

  The in-compartment heat exchanger 31 is disposed in the left warehouse 3 c, and the inlet side thereof is connected to the branch pipe 33. The branch pipe 33 branches from a high-pressure side branch point P3 in the middle of the path between the compressor 21 and the condenser 22 and communicates with the inlet of the internal heat exchanger 31. This internal heat exchanger 31 is for condensing the refrigerant passing therethrough and heating the internal air of the left storage 3c.

  The gas cooler 32 is connected to the internal heat exchanger 31 through the heat radiating pipe 34, and its inlet communicates with the outlet of the internal heat exchanger 31 through the heat radiating pipe 34. This gas cooler 32 is disposed adjacent to the condenser 22 that constitutes the cooling-only path 20, and allows heat to be exchanged between the refrigerant passing therethrough and the ambient air to dissipate heat to the refrigerant. A return pipe 35 is connected to the outlet side of the gas cooler 32. The return pipe 35 is connected to the gas cooler 32 and is connected to the refrigerant pipe 25 constituting the cooling dedicated path 20, that is, the third junction P 4 of the refrigerant pipe 25 between the condenser 22 and the capillary tube 23. .

  In the refrigerant circuit 10 having the above configuration, an internal heat exchanger 36, a valve unit 40, a bypass path 50, and a bypass valve 51 are further provided.

  The internal heat exchanger 36 exchanges heat between the refrigerant that flows through the third junction P4 and flows toward the capillary tube 23 and the refrigerant that flows through the evaporator 24 and flows toward the compressor 21. is there.

  The valve unit 40 includes a cooling switching valve 41 and a heating switching valve 42. The cooling switching valve 41 is provided in the refrigerant pipe 25 constituting the cooling dedicated path 20, that is, the refrigerant pipe 25 extending from the high-pressure side branch point P <b> 3 to the condenser 22. The cooling switching valve 41 is a valve body that can be opened and closed. When the opening command is given from the control unit, the cooling switching valve 41 is opened to allow the passage of the refrigerant, while when the closing command is given, the cooling switching valve 41 is closed. It regulates the passage of refrigerant.

  The heating switching valve 42 is provided in a branch pipe 33 that constitutes the heating path 30, that is, a pipe that extends from the high-pressure side branch point P <b> 3 to the internal heat exchanger 31. The heating switching valve 42 is a valve body that can be opened and closed. When the opening command is given from the control unit, the heating switching valve 42 opens and allows the refrigerant to pass therethrough, but closes when the closing command is given. It regulates the passage of refrigerant.

  When one of the cooling switching valve 41 and the heating switching valve 42 is open, the other is closed. That is, when the cooling switching valve 41 is opened, the heating switching valve 42 is closed, while when the heating switching valve 42 is opened, the cooling switching valve 41 is closed.

  The bypass path 50 branches off in the middle of the refrigerant pipe 25 on the inlet side of the capillary tube 23, that is, the path (refrigerant pipe 25) from the internal heat exchanger 36 to the capillary tube 23, and the refrigerant pipe 25 on the outlet side of the capillary tube 23. That is, it is configured by a bypass pipe provided in such a manner that it joins a path (refrigerant pipe 25) from the capillary tube 23 to the distributor 26. This bypass pipe is for sending the refrigerant on the upstream side of the capillary tube 23 to the downstream side of the capillary tube 23.

  The bypass valve 51 is provided in a bypass pipe constituting the bypass path 50. The bypass valve 51 is, for example, a differential pressure valve, and is normally closed to restrict the refrigerant from passing through the bypass path (bypass pipe) 50, while its upstream pressure is predetermined. When the value is equal to or higher than the threshold (for example, about 12 MPa), the refrigerant is opened to allow the refrigerant to pass through the bypass path (bypass pipe) 50. That is, the bypass valve 51 is opened when its upstream pressure is equal to or higher than a predetermined threshold value, and allows the refrigerant to pass through the bypass passage 50, while the upstream pressure becomes less than the threshold value. In some cases, the refrigerant is closed to restrict the refrigerant from passing through the bypass path. Here, the predetermined threshold value for the bypass valve 51 is set to a size that does not cause a high-pressure abnormality in the high-pressure side region of the refrigerant circuit 10.

  The refrigerant circuit device having the above-described configuration cools or heats the product stored in the product storage 3 as follows.

  First, the case of performing a cooling operation (in this embodiment, an operation for cooling the internal air of all the commodity containers 3) will be described. In this case, the cooling switching valve 41 and the low pressure side electromagnetic valves 271, 272, and 273 are opened, and the heating switching valve 42 is closed. As a result, the refrigerant compressed by the compressor 21 circulates as shown in FIG.

  That is, the refrigerant compressed by the compressor 21 passes through the opened cooling switching valve 41 and reaches the condenser 22. The refrigerant that has reached the condenser 22 dissipates heat to the ambient air (outside air) and condenses while passing through the condenser 22. The refrigerant condensed in the condenser 22 adiabatically expands in the capillary tube 23 after passing through the internal heat exchanger 36.

  The refrigerant vaporized by adiabatic expansion in the capillary tube 23 is branched into three by the distributor 26 and further adiabatically expanded by the expansion mechanisms 281, 282, and 283, and the right evaporator 24 a, the middle evaporator 24 b, and the left evaporator. 24c, it evaporates in each evaporator 24, takes heat from the internal air of the commodity storage 3, and cools the internal air. The cooled internal air circulates in the interior by driving each internal blower fan F2, whereby the products stored in each product storage 3 are cooled to the circulating internal air. The refrigerant evaporated in each evaporator 24 passes through the internal heat exchanger 36, is then sucked into the compressor 21, is compressed by the compressor 21, and repeats the circulation described above.

  Next, the case where the heat pump operation (in this embodiment, the operation of heating the internal air of the left warehouse 3c and cooling the internal air of the right warehouse 3a and the middle warehouse 3b) will be described. In this case, the cooling switching valve 41 and the low pressure side solenoid valve 273 are closed, and the heating switching valve 42 and the low pressure side solenoid valves 271 and 272 are opened. As a result, the refrigerant compressed by the compressor 21 circulates as shown in FIG.

  That is, the refrigerant compressed by the compressor 21 enters the branch pipe 33 from the high-pressure side branch point P3, passes through the opened heating switching valve 42, and reaches the internal heat exchanger 31. The refrigerant that has reached the internal heat exchanger 31 exchanges heat with the internal air of the left storage 3c while passing through the heat exchanger, dissipates heat to the internal air, and condenses. Thereby, the internal air of the left warehouse 3c is heated. The heated internal air circulates in each of the left warehouses 3c by driving the internal blower fan F2, whereby the products stored in the left warehouse 3c are heated to the circulating internal air.

  The refrigerant condensed in the internal heat exchanger 31 passes through the heat radiating pipe 34, reaches the gas cooler 32, and radiates heat to the ambient air by the gas cooler 32. The refrigerant radiated by the gas cooler 32 passes through the return pipe 35 and then reaches the third junction P4. The refrigerant that has entered the cooling dedicated path 20 at the third junction P4 reaches the capillary tube 23 after passing through the internal heat exchanger 36, and adiabatically expands in the capillary tube 23.

  The refrigerant vaporized by adiabatic expansion in the capillary tube 23 passes through the low-pressure side electromagnetic valves 271 and 272 opened via the distributor 26, reaches the right evaporator 24a and the middle evaporator 24b, and these right evaporators 24a. And the middle evaporator 24b evaporates to take heat from the internal air of the right warehouse 3a and the central warehouse 3b, and cools the internal air. The cooled internal air circulates inside each of the right warehouse 3a and the middle warehouse 3b by driving the internal blower fan F2, thereby cooling the products accommodated in each of the right warehouse 3a and the middle warehouse 3b. . The refrigerant evaporated in the right evaporator 24a and the middle evaporator 24b passes through the internal heat exchanger 36, is then sucked into the compressor 21, is compressed by the compressor 21, and repeats the circulation described above.

  By the way, when performing such a cooling operation or a heat pump operation, the compressor 21 generally performs an intermittent operation, that is, an operation that repeats driving and driving stop according to the internal temperature of the commodity storage 3. Then, when the compressor 21 is started (several seconds to several tens of seconds from the start of starting the compressor 21), the pressure rapidly increases in the high pressure side region of the refrigerant circuit 10 (the route region from the compressor 21 to the capillary tube 23). become. Thereby, when the pressure in the high pressure side region of the refrigerant circuit 10, that is, the upstream pressure of the bypass valve 51 reaches the threshold value (for example, 12 MPa), the bypass valve 51 is opened, and as shown in FIG. Piping) 50 allows the refrigerant to pass. As a result, the refrigerant passes through the bypass path 50. The refrigerant having passed through the bypass path 50 in this way passes through the low pressure side solenoid valves (271, 272, 273) to be opened, reaches the evaporator 24, passes through the evaporator 24, and then passes through the internal heat exchanger 36. And is sucked into the compressor 21.

  As described above, according to the refrigerant circuit device according to the embodiment of the present invention, the bypass path 50 branches off in the middle of the path (refrigerant pipe 25) from the internal heat exchanger 36 to the capillary tube 23, and the capillary While arranged so as to join the path (refrigerant piping 25) from the tube 23 to the distributor 26, the bypass valve 51 is normally closed to restrict the passage of the refrigerant through the bypass path 50, When the pressure on the upstream side becomes equal to or higher than a predetermined threshold value (for example, about 12 MPa), the refrigerant circuit 10 is opened to allow the refrigerant to pass through the bypass path 50. It is possible to avoid occurrence of a high pressure abnormality due to an abnormal increase in pressure in the high pressure side region. Accordingly, it is possible to prevent the compressor 21 and the like from being damaged due to a high-pressure abnormality when the compressor 21 is started.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this, and various modifications can be made.

  In the above-described embodiment, the internal heat exchanger 31 is disposed only in the left warehouse 3c. However, the present invention is not limited to this, and the internal heat exchanger is provided inside the intermediate warehouse 3b and the left warehouse 3c. 31 may be provided, and the middle warehouse 3b and the left warehouse 3c may be used as a cooling and heating cabinet.

  Further, in the above-described embodiment, carbon dioxide is sealed as a refrigerant in the refrigerant circuit 10, but in the present invention, for example, a refrigerant circuit device using R134a as a refrigerant may be used.

  In the above-described embodiment, the refrigerant circuit 10 includes the cooling dedicated path 20 and the heating path 30. However, in the present invention, the refrigerant circuit device may include only the cooling dedicated path 20. Absent.

  As described above, the refrigerant circuit device according to the present invention is useful for vending machines.

DESCRIPTION OF SYMBOLS 10 Refrigerant circuit 20 Cooling exclusive path 21 Compressor 22 Condenser 23 Capillary tube 24 Evaporator 25 Refrigerant piping 30 Heating path 31 Internal heat exchanger 32 Gas cooler 33 Branch piping 34 Heat radiation piping 35 Return piping 40 Valve unit 41 Cooling switching valve 42 Heating switching valve 50 Bypass path 51 Bypass valve

Claims (2)

A compressor for compressing the refrigerant;
A condenser for condensing the refrigerant compressed by the compressor;
A capillary tube for adiabatic expansion of the refrigerant condensed in the condenser;
In a refrigerant circuit device comprising a dedicated cooling circuit configured by sequentially connecting an evaporator for evaporating the refrigerant adiabatically expanded in the capillary tube with a refrigerant pipe,
A bypass path that is branched from the middle of the refrigerant pipe connected to the inlet side of the capillary tube and is arranged in a manner to join the refrigerant pipe from the capillary tube to the evaporator;
When the upstream pressure of the bypass passage is greater than or equal to a predetermined threshold, the bypass passage is opened to allow the refrigerant to pass through the bypass passage, while the upstream pressure is less than the threshold. And a bypass valve that closes and restricts passage of the refrigerant through the bypass path. An internal heat exchanger that introduces and condenses the refrigerant compressed by the compressor, and an external heat exchanger that dissipates the refrigerant condensed by the internal heat exchanger, and the external heat exchanger A heating path configured to deliver the refrigerant radiated in step to the capillary tube;
When performing the cooling operation, the refrigerant compressed by the compressor is allowed to flow to the condenser and is restricted from flowing to the internal heat exchanger, while when the heat pump operation is performed, 2. A refrigerant unit according to claim 1, further comprising: a valve unit that restricts the refrigerant compressed by the compressor from flowing to the condenser and allows the refrigerant to flow to the internal heat exchanger. Circuit device.

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