JP6379624B2 - Refrigerant circuit device - Google Patents

Description

  The present invention relates to a refrigerant circuit device, and more particularly to a refrigerant circuit device applied to, for example, a vending machine.

  2. Description of the Related Art Conventionally, a refrigerant circuit device that realizes a refrigeration cycle or a heat pump cycle is known in which an ejector is used instead of an expansion valve. The ejector uses the energy generated by depressurizing the high-pressure refrigerant (high-pressure refrigerant) supplied from the radiator to suck the low-pressure refrigerant (low-pressure refrigerant) discharged from the evaporator, and the sucked low-pressure refrigerant is high-pressure. It is mixed with a refrigerant and discharged after the pressure of the low-pressure refrigerant is increased.

  In the refrigerant circuit device using such an ejector, the suctioned low-pressure refrigerant is discharged after being boosted, so that the pressure of the refrigerant sucked into the compressor can be increased, thereby improving the operation efficiency of the compressor. It has the advantage that it can be made.

  By the way, the ejector has a nozzle part that depressurizes and accelerates the high-pressure refrigerant, and the nozzle part is provided with a nozzle valve. The nozzle valve is driven by, for example, a stepping motor, and the opening (throttle amount) for depressurizing the high-pressure refrigerant can be adjusted by driving.

  In such an ejector, for example, when the refrigerant supplied to itself becomes a low flow rate when the refrigerant flow rate is reduced at a low outside air temperature or the like, the refrigerant flow rate change per pulse is relative to the flow rate. It has the characteristic of becoming larger.

  Therefore, a refrigerant circuit device has been proposed in which the flow rate control can be satisfactorily realized even in a low flow rate region by processing the shape of the nozzle part and the nozzle valve (for example, see Patent Document 1).

Japanese Patent No. 4668737

  However, in order to achieve good flow control even in a low flow rate region, it is necessary to process and assemble the shape of the nozzle part and nozzle valve with high accuracy, and the processing technology and assembly technology are complicated. It was a thing. Therefore, in the refrigerant circuit device of Patent Document 1 described above, there is a possibility that the manufacturing cost is increased.

  In view of the above circumstances, an object of the present invention is to provide a refrigerant circuit device that can satisfactorily realize flow rate control even in a low flow rate region while suppressing an increase in manufacturing cost.

  In order to achieve the above object, a refrigerant circuit device according to the present invention heat-exchanges between a compressor that sucks and compresses a refrigerant, and the refrigerant that is provided outside the target chamber and that is supplied to ambient air. An external heat exchanger, an internal heat exchanger that is disposed inside the target chamber and exchanges heat between the supplied refrigerant and the internal atmosphere of the target chamber, and is supplied from the external heat exchanger By depressurizing the refrigerant, the refrigerant discharged from the internal heat exchanger is sucked and mixed to discharge the refrigerant, and the refrigerant supplied from the ejector is separated into a gas phase refrigerant and a liquid phase refrigerant And a refrigerant circuit having gas-liquid separation means for sucking the gas-phase refrigerant to the compressor and supplying the liquid-phase refrigerant to the internal heat exchanger disposed in the target chamber to be cooled. In the refrigerant circuit device, from the outside heat exchanger, the edge When it opens and opens, it allows the refrigerant to pass from the external heat exchanger toward the ejector, while when closed, the external heat exchanger It is characterized by comprising a valve for restricting the passage of refrigerant toward the ejector and a control means for opening and closing the valve at a predetermined opening / closing ratio.

  According to the present invention, in the refrigerant circuit device, the control unit calculates a deviation between a preset target temperature of the target chamber and a room temperature of the target chamber, and performs PID calculation based on the deviation. The valve is opened and closed according to the open / close ratio.

  According to the present invention, when the valve disposed in the path from the external heat exchanger to the ejector is opened, the refrigerant is allowed to pass from the external heat exchanger toward the ejector while being closed. In this case, the passage of the refrigerant from the external heat exchanger toward the ejector is restricted, and the control means opens and closes the valve at a predetermined opening / closing ratio. The refrigerant flow rate to the ejector can be continuously controlled without processing the shape with high precision and assembling it. Thereby, there is an effect that the flow rate control can be satisfactorily realized even in a low flow rate region while suppressing an increase in manufacturing cost.

FIG. 1 is an explanatory diagram 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 is a cross-sectional side view of a vending machine to which the refrigerant circuit device according to the embodiment of the present invention is applied. FIG. 3 is a conceptual diagram conceptually showing the refrigerant circuit device applied to the vending machine shown in FIGS. 1 and 2. FIG. 4 is a block diagram showing a characteristic control system of the refrigerant circuit device shown in FIG. FIG. 5 is a schematic diagram showing the configuration of the ejector shown in FIG. FIG. 6 is an explanatory diagram showing the flow of the refrigerant when the CCC operation is performed. FIG. 7 is an explanatory diagram showing the flow of the refrigerant when the HCC operation is performed. FIG. 8 is a flowchart showing the processing contents of the valve opening / closing control processing executed by the control unit shown in FIG.

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

  1 and 2 each show a vending machine to which a refrigerant circuit device according to an embodiment of the present invention is applied. FIG. 1 is an explanatory view showing a case where an internal structure is viewed from the front. 2 is a cross-sectional side view. The vending machine illustrated here includes a main body cabinet 1.

  The main body cabinet 1 is formed as a rectangular heat insulator having an open front surface. The main body cabinet 1 is provided with an outer door 2 and inner doors 3a and 3b on the front surface thereof, and three independent commodity storage boxes 5 partitioned by, for example, two heat insulating partition plates 4 in the left and right. It is provided in a side-by-side manner.

  More specifically, the outer door 2 is for opening and closing the front opening of the main body cabinet 1, and the inner doors 3 a and 3 b are for opening and closing the front surface of the commodity storage 5. The inner doors 3a and 3b are divided into upper and lower parts, and the upper door 3a opens and closes when a product is replenished. The commodity storage 5 is for storing commodities such as canned drinks and plastic bottled drinks while maintaining a desired temperature.

  The product storage 5 is provided with a product storage rack 6, a payout 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 payout mechanism 7 is provided in the lower part of the product storage rack 6 and is used to carry out the products at the lowest level of the product group stored in the product storage rack 6 one by one. The carry-out shooter 8 guides the product delivered from the delivery mechanism 7 to a product outlet (not shown) provided in the outer door 2 through a product outlet 3c provided in the lower inner door 3b. belongs to.

  FIG. 3 is a conceptual diagram conceptually showing the refrigerant circuit device applied to the vending machine shown in FIGS. 1 and 2, and FIG. 4 is a characteristic control system of the refrigerant circuit device shown in FIG. FIG. The refrigerant circuit device illustrated here includes a refrigerant circuit 10 in which a refrigerant is sealed. The refrigerant circuit 10 includes a main path 20, a high-pressure refrigerant introduction path 30, and a return path 40. Yes.

  The main path 20 is configured by sequentially connecting a compressor 21, an external heat exchanger 22, an ejector 23, a gas-liquid separator 24, and an internal heat exchanger 25 through a refrigerant pipe 26.

  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 and partitioned from the product storage 5 and below the product storage 5. 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-pressure refrigerant), and discharges it from the discharge port.

  The external heat exchanger 22 is disposed in the machine room 9 like the compressor 21, and includes a first external heat exchanger 22a and a second external heat exchanger 22b. In addition, an outside air blower fan F1 is disposed in the vicinity of the outside heat exchanger 22.

  When the refrigerant compressed by the compressor 21 passes through its own flow path, the first external heat exchanger 22a exchanges heat with ambient air to dissipate heat. A three-way valve 271 is provided in the refrigerant pipe 26 that connects the external heat exchanger 22 and the compressor 21. The three-way valve 271 will be described later.

  The second external heat exchanger 22b is integrated with the first external heat exchanger 22a in a state where the fin member thermally connected to the flow path of the second external heat exchanger 22b is shared with the first external heat exchanger 22a. It is structured. The second external heat exchanger 22b is configured to dissipate heat by exchanging heat between the refrigerant passing through the flow path, that is, the heat dissipated by the first external heat exchanger 22a, with the ambient air.

  Although details will be described later, the ejector 23 reduces the pressure of the high-pressure refrigerant (high-pressure refrigerant) radiated by the external heat exchanger 22 (second external heat exchanger 22b) by the internal heat exchanger 25. The discharged low-pressure refrigerant (low-pressure refrigerant) is sucked, and the sucked low-pressure refrigerant is mixed with the high-pressure refrigerant from the external heat exchanger 22 and is discharged after being pressurized. As shown in FIG. 5, the ejector 23 in the present embodiment is a two-phase flow ejection type ejector, and includes a nozzle portion 231, a mixing portion 232, and a diffuser portion 233.

  The nozzle part 231 is a part that depressurizes and accelerates the high-pressure refrigerant from the external heat exchanger 22 sucked through the high-pressure refrigerant introduction port 234. By accelerating the high-pressure refrigerant in this way, the low-pressure refrigerant discharged from the internal heat exchanger 25 through the refrigerant suction port 235 can be sucked. The nozzle portion 231 is provided with a nozzle valve 231a. The nozzle valve 231a is a valve body for adjusting the nozzle diameter for depressurizing the high-pressure refrigerant.

  The mixing unit 232 is a part that mixes the high-pressure refrigerant accelerated by the nozzle unit 231 and the low-pressure refrigerant sucked through the refrigerant suction port 235.

  The diffuser unit 233 is a part that pressurizes the refrigerant (mixed refrigerant) mixed in the mixing unit 232. The pressurized mixed refrigerant is discharged toward the gas-liquid separator 24.

  The gas-liquid separator 24 separates the mixed refrigerant discharged from the ejector 23 into a gas-phase refrigerant and a liquid-phase refrigerant. The gas-phase refrigerant separated by the gas-liquid separator 24 is sucked into the compressor 21, while the separated liquid-phase refrigerant is discharged to the internal heat exchanger 25.

  A plurality (three in the illustrated example) of the internal heat exchangers 25 are provided, and each of the internal heat exchangers 25 is disposed on the front side of the rear duct D in the low internal area of each commodity storage 5. In the vicinity of each internal heat exchanger 25, an internal air blower fan F2 is disposed.

  The refrigerant conduit 26 connecting the internal heat exchanger 25 and the gas-liquid separator 24 is branched into three by a distributor 28 disposed in the middle thereof, and the right commodity storage 5 (hereinafter, right side). The internal heat exchanger 25 (hereinafter also referred to as the right internal heat exchanger 25a) disposed in the storage 5a) and the central product storage 5 (hereinafter also referred to as the internal storage 5b). In-compartment heat exchanger 25 (hereinafter, also referred to as “inside-compartment heat exchanger 25b”) and in-compartment heat exchanger 25 (hereinafter, “left”) disposed in the left product storage 5 (hereinafter, also referred to as “left-compartment 5c”). It is respectively connected to the inlet side of the internal heat exchanger 25c).

  In the refrigerant pipe 26, an electromagnetic valve 272 is provided on the way from the distributor 28 to the left-inside heat exchanger 25c. The electromagnetic valve 272 is a valve body that opens and closes in response to a command given from the control unit 50 described later.

  The refrigerant pipes 26 connected to the respective outlet sides of the internal heat exchanger 25 are connected to the ejector 23 in such a manner that they merge at the first junction P1 and communicate with the refrigerant inlet 235 of the ejector 23. Has been.

  The high-pressure refrigerant introduction path 30 is configured by a high-pressure refrigerant introduction pipe 31 having one end connected to the three-way valve 271 and the other end connected to the inlet side of the heating heat exchanger 32 disposed in the left warehouse 5c. ing. The high-pressure refrigerant introduction path 30 is for introducing the high-pressure refrigerant compressed by the compressor 21 into the heating heat exchanger 32.

  Here, the three-way valve 271 is between a first delivery state in which the high-pressure refrigerant compressed by the compressor 21 is delivered to the first external heat exchanger 22a and a second delivery state in which the high-pressure refrigerant is delivered to the heating heat exchanger 32. The valve body can be switched alternatively. The switching operation of the three-way valve 271 is performed according to a command given from the control unit 50.

  The return path 40 has one end connected to the outlet side of the heating heat exchanger 32 and the other end connected to the refrigerant pipe 26 constituting the main path 20, that is, the first external heat exchanger 22a and the second external heat. It is comprised by the return line 41 connected to the 2nd junction P2 of the refrigerant line 26 between the exchangers 22b. The return path 40 is for returning the refrigerant that has passed through the heating heat exchanger 32 to the main path 20. In addition, the code | symbol 42 in FIG. 3 is a check valve.

  The refrigerant circuit device as described above includes the valve 29, the internal temperature sensor S1, and the control unit 50 in addition to the above configuration.

  The valve 29 is disposed in the refrigerant conduit 26 between the second external heat exchanger 22b and the ejector 23. The valve 29 is a valve body that can be opened and closed by a command given from the control unit 50, and allows the refrigerant to pass from the second external heat exchanger 22b toward the ejector 23 when opened. In the case of closing, the passage of the refrigerant from the second external heat exchanger 22b toward the ejector 23 is restricted.

  The in-compartment temperature sensor S1 is disposed inside each commodity storage 5 and detects the internal temperature (internal temperature) of the commodity storage 5 in which it is disposed. The internal temperature detected by the internal temperature sensor S1 is given to the control unit 50 as an internal temperature signal.

  The control unit 50 controls the three-way valve 271, the electromagnetic valve 272, and the valve 29 constituting the refrigerant circuit device in accordance with programs and data stored in the memory 55, and includes an input processing unit 51, a calculation processing unit 52, and an output. A processing unit 53 is provided.

  The input processing unit 51 performs input processing of signals and commands from the internal temperature sensors S1 and the vending machine control unit 60. The vending machine control unit 60 controls the overall operation of the vending machine to which the refrigerant circuit device is applied.

  The calculation processing unit 52 obtains a deviation between the internal temperature of the target product storage 5 input through the input processing unit 51 and the target temperature of the product storage 5 stored in the memory 55, and based on the deviation. The PID calculation is performed to calculate the opening / closing ratio (duty ratio) of the valve 29. The output processing unit 53 gives commands to each of the electromagnetic valve 272, the three-way valve 271, and the valve 29.

  In the refrigerant circuit device as described above, the internal temperature of each commodity storage 5 can be adjusted to a desired temperature state by controlling the three-way valve 271 and the electromagnetic valve 272 through the control unit 50. Thus, the product stored in the product storage 5 can be cooled or heated. Here, when performing the CCC operation (operation for cooling the internal air of all the product storage boxes 5) and the HCC operation (heating the internal air of the left storage 5c and cooling the internal air of the right storage 5c and the central storage 5b). The case where the operation is performed will be described as a representative example.

  First, the case where the CCC operation is performed will be described. In this case, the control unit 50 brings the three-way valve 271 into the first delivery state and opens the electromagnetic valve 272.

  As a result, the refrigerant compressed by the compressor 21 passes through the three-way valve 271 in the first delivery state and reaches the first external heat exchanger 22a, as shown in FIG. The refrigerant that has reached the first external heat exchanger 22a performs heat exchange with ambient air (outside air) while passing through the first external heat exchanger 22a, and dissipates heat. The refrigerant radiated by the first external heat exchanger 22a reaches the second external heat exchanger 22b, and further exchanges heat with ambient air while passing through the second external heat exchanger 22b. The refrigerant radiated by the second external heat exchanger 22b is sent to the ejector 23.

  The refrigerant (high-pressure refrigerant) sent to the ejector 23 enters the nozzle portion 231 through the high-pressure refrigerant introduction port 234 and is accelerated by being decompressed. As a result, the refrigerant (low-pressure refrigerant) that has passed through the internal heat exchanger 25 is sucked through the refrigerant suction port 235. Then, in the mixing unit 232 of the ejector 23, the accelerated high-pressure refrigerant and the sucked low-pressure refrigerant are mixed to become a mixed refrigerant and reach the diffuser unit 233, and the mixed refrigerant is pressurized by the diffuser unit 233. After being discharged.

  The mixed refrigerant discharged from the ejector 23 is sent to the gas-liquid separator 24, and is separated into a gas-phase refrigerant and a liquid-phase refrigerant by the gas-liquid separator 24. The separated gas phase refrigerant is sucked into the compressor 21. On the other hand, the separated liquid phase refrigerant is sent to each internal heat exchanger 25 via the distributor 28.

  The refrigerant (low-pressure refrigerant) sent to each internal heat exchanger 25 passes through a refrigerant flow path (not shown) and exchanges heat with ambient air (internal air) to cool the ambient air. The cooled air circulates in the interior by driving the internal blower fan F2 disposed in the vicinity of each internal heat exchanger 25, whereby the products stored in each product storage 5 are cooled by the circulating air. Is done. The refrigerant that has passed through each of the internal heat exchangers 25 joins at the first junction P1, and then is sucked into the refrigerant suction port 235 of the ejector 23 by the suction force generated when the high-pressure refrigerant is decompressed and accelerated in the ejector 23. It reaches. In this way, the refrigerant repeats the cycle of circulating through the refrigerant circuit 10.

  Next, a case where the HCC operation is performed will be described. In this case, the control unit 50 puts the three-way valve 271 in the second delivery state and closes the electromagnetic valve 272.

  As a result, the refrigerant compressed by the compressor 21 passes through the three-way valve 271 in the second delivery state and is sent to the heating heat exchanger 32 through the high-pressure refrigerant introduction pipe 31 as shown in FIG.

  The refrigerant (high-pressure refrigerant) sent to the heat exchanger 32 for heating passes through a refrigerant channel (not shown) and exchanges heat with ambient air (internal air) to heat the ambient air. The heated air circulates in the interior by driving the internal blower fan F2, and thereby the product stored in the left compartment 5c is heated by the circulating air.

  The refrigerant that has passed through the heat exchanger 32 for heating reaches the second junction P2 after passing through the return pipe 41, and enters the main path 20 at the second junction P2. The refrigerant that has entered the main path 20 passes through the second external heat exchanger 22b. While passing through the second external heat exchanger 22b, heat is exchanged with ambient air to dissipate heat. The refrigerant radiated by the second external heat exchanger 22b is sent to the ejector 23.

  The refrigerant (high-pressure refrigerant) sent to the ejector 23 enters the nozzle portion 231 through the high-pressure refrigerant introduction port 234 and is accelerated by being decompressed. As a result, the refrigerant (low-pressure refrigerant) that has passed through the internal heat exchanger 25 is sucked through the refrigerant suction port 235. Then, in the mixing unit 232 of the ejector 23, the accelerated high-pressure refrigerant and the sucked low-pressure refrigerant are mixed to become a mixed refrigerant and reach the diffuser unit 233, and the mixed refrigerant is pressurized by the diffuser unit 233. After being discharged.

  The mixed refrigerant discharged from the ejector 23 is sent to the gas-liquid separator 24, and is separated into a gas-phase refrigerant and a liquid-phase refrigerant by the gas-liquid separator 24. The separated gas phase refrigerant is sucked into the compressor 21. On the other hand, the separated liquid-phase refrigerant is sent to the internal heat exchanger 25b and the right internal heat exchanger 25a via the distributor 28.

  The refrigerant (low-pressure refrigerant) sent to the internal heat exchanger 25b passes through a refrigerant flow path (not shown) and exchanges heat with ambient air (internal air) to cool the ambient air. The cooled air circulates in the interior by driving the internal blower fan F2 disposed in the vicinity of the internal heat exchanger 25b, whereby the product stored in the internal store 5b is cooled by the circulating air. .

  The refrigerant (low-pressure refrigerant) sent to the right-side internal heat exchanger 25a passes through a refrigerant flow path (not shown) and exchanges heat with ambient air (internal air) to cool the ambient air. The cooled air circulates in the interior by driving the internal blower fan F2 disposed in the vicinity of the right internal heat exchanger 25a, whereby the product stored in the right internal 5a is cooled by the circulating air. .

  The refrigerant that has passed through the inner-compartment heat exchanger 25b and the right-inside heat exchanger 25a merges at the first junction P1, and then, by the suction force generated by the high-pressure refrigerant being depressurized and accelerated in the ejector 23, It reaches the refrigerant suction port 235 of the ejector 23. In this way, the refrigerant repeats the cycle of circulating through the refrigerant circuit 10.

  Thus, in the refrigerant circuit device that performs the CCC operation or the HCC operation, the valve opening / closing control process is performed at each preset time interval.

  FIG. 8 is a flowchart showing the processing contents of the valve opening / closing control processing executed by the control unit shown in FIG.

  In this valve opening / closing control process, the control unit 50 inputs the internal temperature signal from the internal temperature sensor S1 through the input processing unit 51 (step S101: Yes), that is, the internal temperature of the product storage 5 to be cooled. Is detected by the internal temperature sensor S1, the open / close ratio is calculated through the calculation processing unit 52 (step S102). More specifically, the control unit 50 reads out the target temperature of the product storage 5 in which the internal temperature sensor S1 is disposed from the memory 55 through the calculation processing unit 52, and inputs the read target temperature in step S101. A deviation from the internal temperature is obtained, and a PID calculation is performed based on the deviation to calculate an opening / closing ratio (duty ratio) of the valve 29.

  The control unit 50 having calculated the opening / closing ratio of the valve 29 gives an instruction to the valve 29 through the output processing unit 53 according to the opening / closing ratio to open / close the valve 29 (step S103), and then returns the procedure to this time. Terminate the process.

  According to this, the refrigerant | coolant flow volume with respect to the ejector 23 can be continuously controlled by opening and closing the valve | bulb 29 by a predetermined opening / closing ratio.

  As described above, according to the refrigerant circuit device according to the present embodiment, when the valve 29 disposed in the refrigerant pipe 26 extending from the external heat exchanger 22 to the ejector 23 is opened, While allowing the refrigerant to pass from the heat exchanger 22 toward the ejector 23, when closing, restricts the refrigerant from passing from the external heat exchanger 22 toward the ejector 23, and the control unit Since the deviation between the preset target temperature of the product storage 5 and the internal temperature of the product storage 5 is obtained and the valve 29 is opened / closed at the opening / closing ratio calculated by performing PID calculation based on the deviation, The coolant flow rate with respect to the ejector 23 can be continuously controlled without processing and assembling the shape of the nozzle portion and the nozzle valve with high accuracy as in the conventional case. Thereby, it is possible to satisfactorily realize the flow rate control even in the low flow rate region while suppressing an increase in manufacturing cost.

  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 embodiment described above, the liquid-phase refrigerant separated by the gas-liquid separator 24 is sent to the internal heat exchanger 25. However, in the present invention, the liquid-phase refrigerant separated by the gas-liquid separator is used. You may make it send out to a heat exchanger in a warehouse after carrying out adiabatic expansion by expansion mechanisms, such as an electronic expansion valve.

  In the embodiment described above, the control unit 50 opens and closes the valve 29 according to the opening / closing ratio calculated by performing the valve opening / closing control process. However, when the refrigerant amount in the refrigerant circuit 10 is large, the valve opening / closing control is performed. The nozzle valve may be driven without performing the processing.

DESCRIPTION OF SYMBOLS 10 Refrigerant circuit 20 Main path | route 21 Compressor 22 External heat exchanger 23 Ejector 24 Gas-liquid separator 25 Internal heat exchanger 271 Three-way valve 272 Solenoid valve 29 Valve 30 High-pressure refrigerant introduction path 31 High-pressure refrigerant introduction line 32 Heating Heat exchanger 40 Return path 41 Return line 50 Control section 51 Input processing section 52 Calculation processing section 53 Output processing section 55 Memory S1 Internal temperature sensor

Claims (1)

A compressor that sucks and compresses the refrigerant;
An external heat exchanger that is disposed outside the target chamber and exchanges heat between the supplied refrigerant and ambient air;
An internal heat exchanger that is disposed inside the target chamber and exchanges heat between the supplied refrigerant and the internal atmosphere of the target chamber;
An ejector that sucks the refrigerant discharged from the internal heat exchanger by depressurizing the refrigerant supplied from the external heat exchanger and mixes and discharges these refrigerants;
The refrigerant supplied from the ejector is separated into a gas-phase refrigerant and a liquid-phase refrigerant, and the gas-phase refrigerant is sucked into the compressor, while the liquid-phase refrigerant is heated in the target chamber to be cooled. In a refrigerant circuit device comprising a refrigerant circuit having gas-liquid separation means for supplying to an exchanger,
When the refrigerant is disposed in the path from the external heat exchanger to the ejector and opened, the refrigerant is allowed to pass from the external heat exchanger toward the ejector, whereas when closed. Is a valve that regulates the passage of refrigerant from the external heat exchanger toward the ejector;
Control means for opening and closing the valve at a predetermined opening and closing rate ,
The control means obtains a deviation between a preset target temperature of the target room and the room temperature of the target room, and opens and closes the valve at an opening / closing ratio calculated by performing PID calculation based on the deviation. A refrigerant circuit device.

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