WO2022149187A1

WO2022149187A1 - Refrigeration cycle apparatus

Info

Publication number: WO2022149187A1
Application number: PCT/JP2021/000098
Authority: WO
Inventors: 正紘伊藤
Original assignee: 三菱電機株式会社
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2022-07-14
Also published as: US20240011696A1; JPWO2022149187A1; CN116829884A; EP4276384A1; EP4276384A4

Abstract

This refrigeration cycle apparatus (1) comprises: a compressor (13) provided to a first refrigerant path (F1) between a first heat exchanger (11) and a second heat exchanger (12); a first flow rate adjustment device (14) provided to a second refrigerant path (F2) between the first heat exchanger (10) and the second heat exchanger (12); a refrigerant retention device (16) provided to a third refrigerant path (F3) connected in parallel to the second refrigerant path (F2) between the first heat exchanger (11) and the second heat exchanger (12), the refrigerant retention device (16) being capable of retaining a refrigerant flowing in from the second flow path (F2); a second flow rate adjustment device (18) provided to the third refrigerant path (F3), the second flow rate adjustment device (18) adjusting the flow rate of the refrigerant between the second refrigerant path (F2) and the refrigerant retention device (16); and a control device (100) that, when an air-cooling operation is started, controls the second flow rate adjustment device (18) so as to block the inflow of refrigerant from the second refrigerant path (F2) to the refrigerant retention device (16).

Description

Refrigeration cycle device

This disclosure relates to a refrigeration cycle device.

In the refrigeration cycle device, the amount of refrigerant used in the cooling operation is larger than that in the heating operation. Therefore, in some conventional refrigeration cycle devices, a refrigerant storage device for temporarily storing a surplus refrigerant in the refrigerant circuit is provided in the case of heating operation.

As a conventional refrigeration cycle equipped with a refrigerant storage device, for example, as disclosed in International Publication No. 2016/121068 (Patent Document 1), a compressor, a flow path switching device, a heat source side heat exchanger, and the first It includes a refrigerant circuit including a throttle device and a heat exchanger on the user side, and a liquid back suppression circuit connected in parallel to the first throttle device, and the liquid back suppression circuit includes a second throttle device, an on-off valve, and a second throttle device. Some included a high pressure receiver connected to the on-off valve.

International Publication No. 2016/121068 (Fig. 1)

However, in the conventional refrigeration cycle device, when the cooling operation is started in a state where the outside air temperature is extremely low, the temperature of the refrigerant storage device is extremely higher than the temperature of the water for heat exchange in the user side heat exchanger due to the outside air temperature. It's getting low. As a result, at the time of starting such a cooling operation, based on the pressure difference between the pressure in the refrigerant storage device and the pressure in the refrigerant path to which the user-side heat exchanger is connected, the refrigerant path is used to enter the refrigerant storage device. Refrigerant may flow into and be stored in the room. Then, after the start of such a cooling operation, the refrigerant stored in the refrigerant storage device is discharged because the heat capacity of the refrigerant storage device is relatively large and the temperature of the refrigerant storage device does not easily rise. There was a risk that it could not be done. As described above, when the cooling operation is performed with the refrigerant stored in the refrigerant storage device, there is a problem that the capacity of the refrigeration cycle device is lowered due to the insufficient amount of the refrigerant required for the cooling operation. ..

The refrigerating cycle device of the present disclosure is intended to prevent a decrease in the capacity of the refrigerating cycle device during cooling operation.

This disclosure relates to a refrigeration cycle device. The refrigeration cycle device is a compressor provided in the first refrigerant path between the first heat exchanger and the second heat exchanger, and a second refrigerant between the first heat exchanger and the second heat exchanger. The first flow control device provided in the path and the second heat exchanger are provided in the third refrigerant path connected in parallel with a part of the second heat exchanger between the first heat exchanger and the second heat exchanger. A refrigerant storage device capable of storing the refrigerant flowing in from the refrigerant path, a second flow rate adjusting device provided in the third refrigerant path and adjusting the flow rate of the refrigerant between the second refrigerant path and the refrigerant storage device, and a cooling operation. It is provided with a control device that controls the second flow rate adjusting device so as to block the inflow of the refrigerant from the second refrigerant path to the refrigerant storage device at the time of starting.

According to the refrigeration cycle device of the present disclosure, when the cooling operation is started, the second flow rate adjusting device is controlled so as to block the inflow of the refrigerant from the second refrigerant path to the refrigerant storage device, so that the outside air temperature is adjusted. It is possible to prevent the refrigerant from flowing into the refrigerant storage device when the cooling operation is started in an extremely low state. Thereby, in the refrigerating cycle of the present disclosure, it is possible to prevent the refrigerating cycle apparatus from being functionally deteriorated because the amount of the refrigerant is not insufficient in the cooling operation.

It is a figure which shows the refrigerant circuit structure of the refrigerating cycle apparatus 1 in Embodiment 1. FIG. It is a figure which shows the refrigerant circuit structure of the refrigerating cycle apparatus 1 in Embodiment 1. FIG. FIG. 5 is a flowchart in which the CPU 102 of the control device 100 in the first embodiment controls the second flow rate adjusting device 18 and the third flow rate adjusting device 19 at the start of the cooling operation. It is a figure which shows the refrigerant circuit structure of the refrigerating cycle apparatus 1A in Embodiment 2. FIG. It is a figure which shows the refrigerant circuit structure of the refrigerating cycle apparatus 1A in Embodiment 2. FIG. It is a flowchart of the control which executes the defrosting operation at the time of a heating operation by the CPU 102 of the control apparatus 100 in Embodiment 2. FIG. It is a flowchart of the control which executes the defrosting operation at the time of a heating operation by the CPU 102 of the control apparatus 100 in Embodiment 3. FIG.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Hereinafter, a plurality of embodiments will be described, but it is planned from the beginning of the application to appropriately combine the configurations described in the respective embodiments. The same or corresponding parts in the drawings are designated by the same reference numerals and the description thereof will not be repeated.

Embodiment 1.
1 and 2 are diagrams showing a refrigerant circuit configuration of the refrigeration cycle device 1 according to the first embodiment. FIG. 1 shows the state of the refrigerant circuit of the refrigerating cycle device 1 during the cooling operation. FIG. 1 shows the state of the refrigerant circuit of the refrigerating cycle device 1 during the heating operation.

With reference to FIGS. 1 and 2, the refrigeration cycle device 1 includes a compressor 13, a flow path switching device 15, a first heat exchanger 11, a second heat exchanger 12, a first flow rate adjusting device 14, and a refrigerant storage device. A refrigerant circuit including 16, a first check valve 21, a second check valve 22, a third check valve 17, a second flow rate adjusting device 18, and a third flow rate adjusting device 19 is provided. The refrigerant circuit is a path for the refrigerant used in the refrigeration cycle device 1. In FIGS. 1 and 2, the direction in which the refrigerant flows is indicated by an arrow.

The refrigeration cycle device 1 includes a first refrigerant path F1, a second refrigerant path F2, a third refrigerant path F3, a fourth refrigerant path F4, and a fifth refrigerant path F5 as the refrigerant paths.

The first heat exchanger 11 is an air heat exchanger that exchanges heat between the outdoor air and the refrigerant. The first heat exchanger 11 functions as a refrigerant condenser during the cooling operation and as a refrigerant evaporator during the heating operation. Although not shown, a fan fan for supplying air to the first heat exchanger 11 is provided in the vicinity of the first heat exchanger 11. The blower fan has a function of sucking in outdoor air and discharging the air exchanged with the refrigerant by the first heat exchanger 11 to the outside.

The second heat exchanger 12 is a water heat exchanger that exchanges heat between the water of the indoor unit and the refrigerant (not shown). The second heat exchanger 12 functions as a refrigerant evaporator during the cooling operation and as a refrigerant condenser during the heating operation.

In the first refrigerant path F1 between the first heat exchanger 11 and the second heat exchanger 12, a compressor 13 for compressing the refrigerant is provided. The compressor 13 is driven by, for example, a motor controlled by an inverter.

A first flow rate adjusting device 14 is provided in the second refrigerant path F2 between the first heat exchanger 11 and the second heat exchanger 12. The first flow rate adjusting device 14 has a function of depressurizing and expanding the refrigerant, and is composed of, for example, an electronic expansion valve whose flow rate can be adjusted. The first flow rate adjusting device 14 can adjust the flow rate of the refrigerant in the second refrigerant path F2 both during the cooling operation and the heating operation, and is used to reduce the pressure and expand the refrigerant.

In the third refrigerant path F3 connected in parallel with a part of the second refrigerant path F2, a refrigerant storage device 16 capable of storing the refrigerant flowing in from the second refrigerant path F2 is provided. Specifically, the refrigerant storage device 16 is connected in parallel to the second refrigerant path F2 between the first flow rate adjusting device 14 and the second heat exchanger 12. The refrigerant storage device 16 is a metal tubular refrigerant tank, and can store the refrigerant.

In the third refrigerant path F3, a third refrigerant can flow between the refrigerant storage device 16 and the first flow rate adjusting device 14 from the inside of the refrigerant storage device 16 in only one direction of the second refrigerant path F2. A check valve 17 is provided. In the third check valve 17, the pressure inside the refrigerant storage device 16 is higher than the pressure of the second refrigerant path F2 between the first flow rate adjusting device 14 and the second heat exchanger 12 by a reference value or more. In this case, the refrigerant flows from the inside of the refrigerant storage device 16 into the second refrigerant path F2 and is discharged.

In the third refrigerant path F3, a refrigerant storage device 16 and a second flow rate adjusting device 18 capable of opening and closing the refrigerant path between the first flow rate adjusting device 14 and the second heat exchanger 12 are provided. The second flow rate adjusting device 18 is composed of a valve whose flow rate can be adjusted, such as an electronic expansion valve, and is in either a fully closed state or a fully open state. The second flow rate adjusting device 18 may use a solenoid valve that is in either a fully open state or a fully closed state. Further, the second flow rate adjusting device 18 may be controlled to an opening degree other than the fully open state and the fully closed state.

The amount of refrigerant used in the refrigerant circuit of the refrigeration cycle device 1 is larger during the cooling operation than during the heating operation. During the cooling operation as shown in FIG. 1, basically all the refrigerant in the refrigerant circuit is used in the refrigerant circuit, so that it is not necessary to store the refrigerant in the refrigerant storage device 16. On the other hand, in the heating operation as shown in FIG. 2, basically, if all the refrigerants in the refrigerant circuit are used in the refrigerant circuit, the amount of the refrigerant becomes excessive. It is necessary to store the stored refrigerant 30 in the refrigerant storage device 16.

A third flow rate adjusting device 19 for supplying a liquid refrigerant (hereinafter referred to as a liquid refrigerant) to the compressor 13 is provided in the fourth refrigerant path F4 between the second refrigerant path F2 and the suction side of the compressor 13. .. The third flow rate adjusting device 19 uses a liquid refrigerant on the suction side of the compressor 13 for the purpose of preventing the compressor 13 from overheating even when a refrigerant such as R32 refrigerant whose temperature tends to rise is used. It is provided to supply to. Specifically, a part of the liquid refrigerant flowing through the second refrigerant path F2 is supplied to the compressor 13 via the third flow rate adjusting device 19. The third flow rate adjusting device 19 is composed of a valve whose flow rate can be adjusted, such as an electronic expansion valve.

The fourth refrigerant path F4 includes a first branch path F41, a second branch path F42, and a supply path F43. The first branch path F41 is a path for flowing out a part of the liquid refrigerant from the second refrigerant path F2 and sending it to the third flow rate adjusting device 19 during the cooling operation of FIG. 1. The second branch path F42 is a path for flowing out a part of the liquid refrigerant from the second refrigerant path F2 and sending it to the third flow rate adjusting device 19 during the heating operation of FIG.

The first branch path F41 branches from the path between the first heat exchanger 11 and the first flow rate adjusting device 14 in the second refrigerant path F2 and is connected to the inlet side of the third flow rate adjusting device 19. The second branch path F42 branches from the path between the second heat exchanger 12 and the first flow rate adjusting device 14 in the second refrigerant path F2 and is connected to the inlet side of the third flow rate adjusting device 19. The supply path F43 connects the outlet side of the third flow rate adjusting device 19 and the suction side of the compressor 13 from the first branch path F41 or the second branch path F42.

The first branch path F41 is provided with a first check valve 21 that allows liquid refrigerant to flow only in one direction from the first heat exchanger 11 side to the third flow rate adjusting device 19 during cooling operation. The second branch path F42 is provided with a second check valve 22 that allows the liquid refrigerant to flow only in one direction from the second heat exchanger 12 side to the third flow rate adjusting device 19 during the heating operation. Each of the first check valve 21 and the second check valve 22 directs the liquid refrigerant toward the third flow rate adjusting device 19 based on the fact that the pressure on the inlet side is higher than the pressure on the outlet side by a reference value or more. And shed.

During the cooling operation, the liquid refrigerant flows between the first heat exchanger 11 and the first flow rate adjusting device 14 in the second refrigerant path F2. As a result, during the cooling operation, as shown in FIG. 1, the liquid refrigerant flows from the first branch path F41 to the third flow rate adjusting device 19 via the first check valve 21, and further, the third flow rate adjusting device 19 It flows from the supply path F43 to the suction side of the compressor 13. During the heating operation, the liquid refrigerant flows between the second heat exchanger 12 and the first flow rate adjusting device 14 in the second refrigerant path F2. As a result, during the heating operation, as shown in FIG. 2, the liquid refrigerant flows from the second branch path F42 to the third flow rate adjusting device 19 via the second check valve 22, and further, the third flow rate adjusting device 19 It flows from the supply path F43 to the suction side of the compressor 13.

The discharge-side path of the compressor 13 in the first refrigerant path F1 is connected to either the first heat exchanger 11 or the second heat exchanger 12 via the flow path switching device 15. The flow path switching device 15 switches the flow path through which the refrigerant flows, and is composed of, for example, a four-way valve.

During the cooling operation, the flow path switching device 15 switches the flow path of the refrigerant so that the path on the discharge side of the compressor 13 is connected to the first heat exchanger 11 as shown in FIG. During the heating operation, the flow path switching device 15 switches the flow path of the refrigerant so that the path on the discharge side of the compressor 13 is connected to the second heat exchanger 12, as shown in FIG.

The refrigerant that can be used in the refrigeration cycle device 1 includes a single refrigerant, a pseudo-azeotropic mixed refrigerant, a non-azeotropic mixed refrigerant, and the like.

The control device 100 includes a CPU (Central Processing Unit) 102, a memory 104 (ROM (Read Only Memory) and RAM (Random Access Memory)), an input / output buffer (not shown) for inputting / outputting various signals, and the like. Consists of including. In the control device, various electronic components are mounted on the control board. The control board includes a plurality of input ports used for inputting signals such as detection signals of various sensors, and control signals of, for example, a first flow rate adjusting device 14, a second flow rate adjusting device 18, and a third flow rate adjusting device 19. It is equipped with a plurality of output ports used for outputting signals required for controlling the actuator of the above.

The CPU 102 expands the program stored in the ROM into a RAM or the like and executes it. The program stored in the ROM is a program in which the processing procedure of the control device 100 is described. The control device 100 executes control of each device in the refrigeration cycle device 1 according to these programs. This control is not limited to software processing, but can also be processed by dedicated hardware (electronic circuit).

The refrigeration cycle device 1 is provided with various sensors. As the sensor, for example, the following ones are provided. On the discharge side of the compressor 13, a discharge temperature sensor 51 for detecting the temperature (hereinafter, referred to as discharge temperature) T1 of the refrigerant discharged from the compressor 13 is provided. The first heat exchanger 11 is provided with a heat exchanger temperature sensor that detects the temperature of the first heat exchanger 11. The heat exchanger temperature sensor detects the temperature of the frost adhering to the first heat exchanger 11. An inlet temperature sensor for detecting the temperature of the refrigerant is provided on the inlet side of the second heat exchanger 12. An outlet temperature sensor for detecting the temperature of the refrigerant is provided on the outlet side of the second heat exchanger 12. The detection signals of various sensors showing the detection signals of the discharge temperature sensor 51 indicating the discharge temperature T1 of the compressor 13 as a representative example are input to the control device 100.

The control device 100 gives a control signal to each of the compressor 13, the first flow rate adjusting device 14, the flow path switching device 15, the second flow rate adjusting device 18, and the third flow rate adjusting device 19. The control device 100 controls the operating frequency of the compressor 13 based on the control signal. The control device 100 controls the opening degree of the first flow rate adjusting device 14 based on the control signal. The control device 100 controls to switch the flow path of the flow path switching device 15 based on the control signal. The control device 100 controls the opening degree of the second flow rate adjusting device 18 based on the control signal. The control device 100 controls the opening degree of the third flow rate adjusting device 19 based on the control signal.

Next, the operation of the refrigeration cycle apparatus 1 will be described with reference to FIGS. 1 and 2.
The operation of the refrigerating cycle apparatus 1 during the cooling operation will be described with reference to FIG. During the cooling operation, the control device 100 controls the flow path in the flow path switching device 15 so that the flow path is as shown in FIG. The opening degree of the first flow rate adjusting device 14 is controlled by the control device 100 based on the degree of superheat. For example, in the control device 100, the suction superheat degree of the compressor 13 obtained from the temperatures detected by the inlet temperature sensor and the outlet temperature sensor of the first heat exchanger 11 becomes a target value (for example, 3 ° C to 5 ° C, etc.). As described above, the opening degree of the first flow rate adjusting device 14 is determined, and the opening degree of the first flow rate adjusting device 14 is controlled.

The high-temperature and high-pressure gas refrigerant compressed and discharged by the compressor 13 flows into the first heat exchanger 11 through the flow path switching device 15 in the first refrigerant path F1. The high-temperature and high-pressure refrigerant that has flowed into the first heat exchanger 11 dissipates heat to the outdoor air and the like, and is condensed into a high-pressure liquid refrigerant. In the second refrigerant path F2, the high-pressure liquid refrigerant flowing out of the first heat exchanger 11 flows into the first flow rate adjusting device 14, is expanded and depressurized, and becomes a low-temperature low-pressure gas-liquid two-phase refrigerant. In the second refrigerant path F2, the gas-liquid two-phase refrigerant flowing out of the first flow rate adjusting device 14 flows into the second heat exchanger 12. The gas-liquid two-phase refrigerant flowing into the second heat exchanger 12 exchanges heat with water and evaporates to become a low-temperature low-pressure gas refrigerant. The gas refrigerant flowing out of the second heat exchanger 12 is sucked into the compressor 13 via the flow path switching device 15 and is compressed again.

During the cooling operation, all the refrigerant in the refrigerant circuit is used in the refrigerant circuit, so it is not necessary to store the refrigerant in the refrigerant storage device 16. However, when the cooling operation is started in a state where the outside air temperature is extremely low, the temperature of the refrigerant storage device 16 is extremely lower than the temperature of the heat exchange water of the second heat exchanger 12 due to the outside air temperature. As a result, based on the pressure difference between the pressure in the refrigerant storage device 16 and the pressure in the second refrigerant path F2, in the second refrigerant path F2, from the downstream side of the first flow rate adjusting device 14 into the refrigerant storage device 16. Refrigerant may flow in.

Further, since the heat capacity of the refrigerant storage device 16 is relatively large, when the cooling operation is started in a state where the outside air temperature is extremely low, if the refrigerant flows into and is stored in the refrigerant storage device 16, the cooling operation is performed. Even if the refrigerant flows in the refrigerant circuit after the start-up, the temperature of the refrigerant storage device 16 is unlikely to rise, and the pressure in the refrigerant storage device 16 is unlikely to rise. As a result, when the refrigerant is stored in the refrigerant storage device 16 at the start of the cooling operation, the pressure in the second refrigerant path F2 is higher than the pressure in the refrigerant storage device 16 even after the start of the cooling operation. It is high, and based on this pressure difference, the refrigerant does not flow out from the refrigerant storage device 16.

As described above, when the refrigerant is stored in the refrigerant storage device 16 during the cooling operation, there arises a problem that the capacity of the refrigerating cycle device 1 is lowered due to the insufficient amount of the refrigerant required for the cooling operation during the cooling operation. Therefore, the control device 100 controls the opening degree of the second flow rate adjusting device 18 to be fully closed when the cooling operation is started, and the second flow rate adjusting device 18 is opened even during the operation after the cooling operation is started. Controls to maintain the degree in a fully closed state. As a result, the capacity of the refrigerating cycle device 1 can be prevented from being lowered by preventing the amount of the refrigerant from being insufficient during the cooling operation.

During the cooling operation, the liquid refrigerant flows between the first heat exchanger 11 and the first flow rate adjusting device 14 in the second refrigerant path F2. As a result, during the cooling operation, the liquid refrigerant flows from the first branch path F41 to the third flow rate adjusting device 19 via the first check valve 21, and further from the supply path F43 via the third flow rate adjusting device 19. It flows to the suction side of the compressor 13. This makes it possible to prevent the compressor 13 from overheating even when a refrigerant such as R32 refrigerant whose temperature tends to rise is used.

The operation during the heating operation will be described with reference to FIG. During the heating operation, the control device 100 controls the flow path in the flow path switching device 15 so as to be the flow path as shown in FIG. The opening degree of the first flow rate adjusting device 14 is controlled by the control device 100 based on the degree of supercooling. Specifically, in the control device 100, the degree of supercooling at the outlet of the second heat exchanger 12 obtained from the temperatures detected by the inlet temperature sensor and the outlet temperature sensor of the second heat exchanger 12 is a target value (for example, 3 ° C.). The opening degree of the first flow rate adjusting device 14 is determined so as to be (~ 5 ° C., etc.).

The high-temperature and high-pressure gas refrigerant compressed and discharged by the compressor 13 flows into the second heat exchanger 12 through the flow path switching device 15 in the first refrigerant path F1. The high-temperature and high-pressure refrigerant that has flowed into the second heat exchanger 12 dissipates heat to water and is condensed into a high-pressure liquid refrigerant. In the second refrigerant path F2, the high-pressure liquid refrigerant flowing out of the second heat exchanger 12 flows into the first flow rate adjusting device 14, is expanded and depressurized, and becomes a low-temperature low-pressure gas-liquid two-phase refrigerant. In the second refrigerant path F2, the gas-liquid two-phase refrigerant flowing out of the first flow rate adjusting device 14 flows into the first heat exchanger 11. At this time, the second flow rate adjusting device 18 is controlled to the open state by the control device 100. As a result, the surplus refrigerant is stored in the refrigerant storage device 16. The gas-liquid two-phase refrigerant flowing into the first heat exchanger 11 exchanges heat with the outdoor air and evaporates to become a low-temperature low-pressure gas refrigerant. The gas refrigerant flowing out of the first heat exchanger 11 is sucked into the compressor 13 via the flow path switching device 15 and is compressed again.

In the heating operation, it is necessary to store the surplus refrigerant in the refrigerant storage device 16 in order to use a smaller amount of the refrigerant than in the cooling operation. Therefore, the control device 100 controls to fully open the opening degree of the second flow rate adjusting device 18 during the heating operation. This makes it possible to prevent the amount of refrigerant from becoming excessive during the heating operation.

During the heating operation, the liquid refrigerant flows between the second heat exchanger 12 and the first flow rate adjusting device 14 in the second refrigerant path F2. As a result, during the heating operation, the liquid refrigerant flows from the second branch path F42 to the third flow rate adjusting device 19 via the second check valve 22, and further from the supply path F43 via the third flow rate adjusting device 19. It flows to the suction side of the compressor 13. This makes it possible to prevent the compressor 13 from overheating even when a refrigerant such as R32 refrigerant whose temperature tends to rise is used.

The refrigeration cycle device 1 performs a defrosting operation for melting the frost in the first heat exchanger 11 when frost is generated in the first heat exchanger 11 during the heating operation described above. Specifically, when the control device 100 determines that the defrosting operation start condition of the first heat exchanger 11 is satisfied during the heating operation, the control device 100 switches the flow path switching device 15 to the path during the cooling operation, and the first heat exchanger A cooling operation is performed in which 11 functions as a condenser. For example, the control device 100 frosts the first heat exchanger 11 when the temperature detected by the heat exchanger temperature sensor provided in the first heat exchanger 11 is lower than the reference value temperature (for example, 0 ° C.). Is generated, and it is judged that the defrosting operation start condition is satisfied.

FIG. 3 is a flowchart in which the CPU 102 of the control device 100 in the first embodiment controls the second flow rate adjusting device 18 and the third flow rate adjusting device 19 at the start of the cooling operation.

In the control device 100, the start of the cooling operation is started by step S1. In the control device 100, in step S2, when the start of the cooling operation is started, the second flow rate adjusting device 18 capable of blocking the inflow of the refrigerant into the refrigerant storage device 16 is fully closed.

In the control device 100, in step S3, it is determined whether or not the discharge temperature T1 of the compressor 13 detected by the discharge temperature sensor 51 is higher than the threshold value. In this case, the threshold value is set to an upper limit such as 100 ° C. so that the compressor 13 is not regarded as overheated.

In the control device 100, when it is determined in step S3 that the discharge temperature T1 is equal to or lower than the threshold value, the third flow rate adjusting device 19 is controlled to the closed state by step S4 to shift to the normal control state in the cooling operation. , Return. On the other hand, in the control device 100, when it is determined in step S3 that the discharge temperature T1 is higher than the threshold value, the third flow rate adjusting device 19 is controlled to the open state by step S5, and the control device 100 returns to the normal control state in the cooling operation. Migrate and return.

As described above, the following effects can be obtained by controlling the second flow rate adjusting device 18 and the third flow rate adjusting device 19 at the start of the cooling operation.

A second flow rate adjusting device 18 capable of blocking the inflow of the refrigerant into the refrigerant storage device 16 is provided, and control is performed to fully close the second flow rate adjusting device 18 at the start of the cooling operation. By such control, the flow of the refrigerant from the downstream side of the first flow rate adjusting device 14 to the refrigerant storage device 16 is blocked when the cooling operation is started in a state where the outside air temperature is extremely low. This makes it possible to prevent the refrigerant from flowing into the refrigerant storage device 16 when the cooling operation is started in a state where the outside air temperature is extremely low. Therefore, during the cooling operation, the amount of the refrigerant is not insufficient and the function of the refrigerating cycle device 1 can be prevented from deteriorating.

When the discharge temperature T1 of the compressor 13 is higher than the threshold value at the start of the cooling operation, the liquid refrigerant is stopped from the first branch path F41 to the first check by opening the third flow rate adjusting device 19. It flows to the third flow rate adjusting device 19 through the valve 21, and further flows from the supply path F43 to the suction side of the compressor 13 through the third flow rate adjusting device 19. This makes it possible to prevent the compressor 13 from becoming overheated even when a refrigerant such as R32 refrigerant whose temperature tends to rise is used.

In the refrigeration cycle device 1, a second flow rate adjusting device 18 that enables control to block the inflow of the refrigerant into the refrigerant storage device 16 is newly provided. Conventionally, as a flow rate adjusting device for depressurizing and expanding the refrigerant in the second refrigerant path F2, a flow rate adjusting device for cooling and a flow rate adjusting device for heating are separately provided, but in the refrigerating cycle device 1, for cooling. A first flow rate adjusting device 14 which is also used as both a flow rate adjusting device for heating and a flow rate adjusting device for heating is provided. Therefore, the total number of flow rate adjusting devices in the refrigerating cycle device 1 does not increase. As a result, even if the second flow rate adjusting device 18 is newly provided, the number of output ports required for controlling the actuator on the control board of the control device 100 can be prevented from increasing.

In the refrigeration cycle device 1, one first flow rate adjusting device that is used as both a cooling flow rate adjusting device and a heating flow rate adjusting device as a flow rate adjusting device for depressurizing and expanding the refrigerant in the second refrigerant path F2. The device 14 was provided. Therefore, in the second refrigerant path F2, the portion of the path through which the liquid refrigerant flows differs between the cooling operation and the heating operation. In the refrigeration cycle device 1, in the second refrigerant path F2, a first branch path F41 is provided between the first heat exchanger 11 and the first flow rate adjusting device 14, which is a path portion through which the liquid refrigerant flows during cooling operation, and the liquid is provided. The refrigerant is allowed to flow to the third flow rate adjusting device 19 via the first check valve 21. Further, in the refrigeration cycle device 1, in the second refrigerant path F2, a second branch path F42 is provided between the second heat exchanger 12 and the first flow rate adjusting device 14, which is a path portion through which the liquid refrigerant flows during the heating operation. , The liquid refrigerant was allowed to flow to the third flow rate adjusting device 19 via the second check valve 22. As a result, even when one first flow rate adjusting device 14 also serves as a flow rate adjusting device for cooling and a flow rate adjusting device for heating, the liquid refrigerant is always supplied to the compressor 13 via the third flow rate adjusting device 19. Can be done.

Embodiment 2.
In the second embodiment, in addition to the control of the second flow rate adjusting device 18 and the third flow rate adjusting device 19 at the start of the cooling operation as shown in the first embodiment, the second embodiment is performed during the defrosting operation in the heating operation. 2 An example of executing the control of the flow rate adjusting device 18 will be described.

4 and 5 are diagrams showing the refrigerant circuit configuration of the refrigerating cycle device 1A according to the second embodiment. FIG. 4 shows the state of the refrigerant circuit of the refrigerating cycle device 1A during the cooling operation. FIG. 5 shows the state of the refrigerant circuit of the refrigerating cycle device 1A during the heating operation. In FIGS. 4 and 5, the direction in which the refrigerant flows is indicated by an arrow.

When the defrosting operation start condition is satisfied and the defrosting operation is executed during the heating operation, the refrigerant stored in the refrigerant storage device 16 is discharged during the heating operation in order to secure the defrosting capacity. It is necessary to use it as a refrigerant in defrosting operation.

In the defrosting operation, the temperature of the refrigerant storage device 16 is relatively high, as in the case where the heating operation is executed for a relatively long time immediately before the defrosting operation start condition is satisfied. In this case, when the second flow rate adjusting device 18 is fully opened, the pressure in the refrigerant storage device 16 is higher than the second refrigerant path F2 between the first flow rate adjusting device 14 and the second heat exchanger 12. As a result, the refrigerant in the refrigerant storage device 16 is discharged via the second flow rate adjusting device 18. On the other hand, in the case of defrosting operation, the temperature of the refrigerant storage device 16 is relatively low, as in the case where the heating operation for a short time is executed immediately before the defrosting operation start condition is satisfied. The pressure in the refrigerant storage device 16 is lower than that of the second refrigerant path F2 between the first flow rate adjusting device 14 and the second heat exchanger 12 even when the second flow rate adjusting device 18 is fully opened. Therefore, the refrigerant in the refrigerant storage device 16 may not be discharged through the second flow rate adjusting device 18.

In the second embodiment, in the case of the defrosting operation, the refrigerant stored in the refrigerant storage device 16 even when the temperature of the refrigerant storage device 16 is relatively low when the defrosting operation start condition is satisfied. The configuration and control of the refrigerating cycle apparatus 1A capable of discharging the freezing cycle device 1A will be described.

With reference to FIGS. 4 and 5, the parts of the refrigerating cycle apparatus 1A of the second embodiment different from the refrigerating cycle apparatus 1 of the first embodiment are the following parts. The first flow rate adjusting device 14 is provided in the second refrigerant path F2 at a position parallel to the refrigerant storage device 16 in the third refrigerant path F3. The refrigerant storage device 16 is provided with a level sensor 61 that detects the level L1 of the liquid level of the stored refrigerant. The detection signal of the level sensor 61 is input to the control device 100.

More specifically, the first flow rate adjusting device 14 is located in parallel with the refrigerant storage device 16 in the third refrigerant path F3 in the second refrigerant path F2, and includes the first branch path F41 and the second branch path F42. It is provided between. As a result, during the heating operation, the second refrigerant path F2 between the first flow rate adjusting device 14 and the first heat exchanger 11 is in a low temperature and low pressure state.

By providing the first flow rate adjusting device 14 at such a position, the third check valve 17 is the third check valve 17 between the first heat exchanger 11 and the first flow rate adjusting device 14 from the inside of the refrigerant storage device 16. 2 It will be provided in such a manner that the refrigerant can flow out to the refrigerant path in only one direction. When the pressure inside the refrigerant storage device 16 of the third check valve 17 becomes higher than the pressure of the second refrigerant path F2 between the first heat exchanger 11 and the first flow rate adjusting device 14, the pressure is higher than the reference value. Refrigerant flows out from the inside of the refrigerant storage device 16 only in one direction to the second refrigerant path between the first heat exchanger 11 and the first flow rate adjusting device 14.

Such a refrigeration cycle device 1A executes the same operation as that of the refrigeration cycle device 1 of the first embodiment, except when the defrosting operation is executed.

FIG. 6 is a flowchart of control in which the CPU 102 of the control device 100 in the second embodiment executes the defrosting operation during the heating operation.

In the control device 100, in step S11, after the start of the heating operation, it is determined whether or not the above-mentioned defrosting operation start condition is satisfied. The control device 100 returns when it is determined in step S11 that the defrosting operation start condition is not satisfied. When it is determined in step S11 that the defrosting operation start condition is satisfied, the control device 100 determines in step S12 whether or not the operation time of the immediately preceding heating operation is longer than the threshold value. .. The operation time of the heating operation immediately before is the duration of the heating operation executed immediately before the defrosting operation start condition is satisfied. The duration of the heating operation is obtained by the control device 100 executing a process of timing the operation duration. The threshold value is set to the duration of the heating operation such that the refrigerant stored in the refrigerant storage device 16 during the heating operation becomes equal to or higher than the reference temperature at which the refrigerant can easily flow out through the second flow rate adjusting device 18.

In the control device 100, when it is determined in step S12 that the operation time of the immediately preceding heating operation is longer than the threshold value, the defrosting operation is started in step S13, and the second flow rate adjusting device 18 is set in step S14. Control to fully open state. In this case, the temperature is equal to or higher than the reference temperature at which the refrigerant stored in the refrigerant storage device 16 during the heating operation can easily flow out through the second flow rate adjusting device 18 based on the operation time of the immediately preceding heating operation. Therefore, the pressure inside the refrigerant storage device 16 is higher than the pressure of the second refrigerant path F2 between the second heat exchanger 12 and the first flow rate adjusting device 14, and the refrigerant is stored in the refrigerant storage device 16. The refrigerant is discharged by flowing out through the second flow rate adjusting device 18 in the fully opened state.

Then, in the control device 100, in step S15, it is determined whether or not the amount of the refrigerant liquid specified from the level L1 of the refrigerant in the refrigerant storage device 16 detected by the level sensor 61 is smaller than the threshold value. The threshold value is set to an amount of the amount of refrigerant stored in the refrigerant storage device 16 during the heating operation, in which the minimum amount of refrigerant required for the defrosting operation is recognized to be discharged. The control device 100 returns after waiting for the liquid amount of the refrigerant specified from the level L1 of the detected refrigerant to be equal to or less than the threshold value in step S15. After that, the defrosting operation is executed until the defrosting operation start condition is no longer satisfied.

In the control device 100, when it is determined in step S12 that the operation time of the immediately preceding heating operation is not equal to or longer than the threshold value, the pressure inside the refrigerant storage device 16 is adjusted to the second heat exchanger 12 and the first flow rate by step S16. The opening degree of the second flow rate adjusting device 18 is controlled to be narrowed down to the reference opening degree so as to be higher than the pressure of the second refrigerant path F2 between the device 14 and the device 14. In this case, the refrigerant stored in the refrigerant storage device 16 during the heating operation does not exceed the reference temperature at which the refrigerant can easily flow out through the second flow rate adjusting device 18 based on the operation time of the immediately preceding heating operation. During the heating operation, the second refrigerant path F2 between the second heat exchanger 12 and the first flow rate adjusting device 14 is in a low pressure state. Therefore, when the pressure inside the refrigerant storage device 16 becomes equal to or higher than the pressure of the second refrigerant path F2 between the first heat exchanger 11 and the first flow rate adjusting device 14 by the control of step S16, Refrigerant flows out from the inside of the refrigerant storage device 16 through the third check valve 17 to the second refrigerant path between the first heat exchanger 11 and the first flow rate adjusting device 14 and is discharged.

Then, in the control device 100, in step S17, it is determined whether or not the liquid amount of the refrigerant specified from the level L1 of the refrigerant in the refrigerant storage device 16 detected by the level sensor 61 is equal to or less than the threshold value. The threshold value is the same value as the threshold value used in step S15. In the control device 100, the defrosting operation is started and returned after waiting for the liquid amount of the refrigerant specified from the level L1 of the detected refrigerant to be equal to or less than the threshold value in step S17. After that, the defrosting operation is executed until the defrosting operation start condition is no longer satisfied.

As described above, in the second embodiment, when the defrosting operation is started, the control device 100 causes the refrigerant to flow out until the amount of the refrigerant stored in the refrigerant storage device 16 becomes equal to or less than the threshold value. The second flow rate adjusting device 18 is controlled. This makes it possible to secure the defrosting ability during the defrosting operation regardless of the state of the refrigerant storage device 16. Further, in the second embodiment, the refrigerant storage device is checked to see if the amount of the refrigerant liquid specified from the level L1 of the refrigerant in the refrigerant storage device 16 detected by the level sensor 61 is equal to or less than the threshold value. Since it is determined whether or not the amount of the refrigerant stored in 16 is equal to or less than the threshold value, it can be easily confirmed that the amount of the refrigerant stored in the refrigerant storage device 16 is equal to or less than the threshold value.

The determination of whether to control the second flow rate adjusting device 18 to be fully opened in step S14 or to control the opening of the second flow rate adjusting device 18 to the reference opening in step S16 is as follows. You may make a good decision. For example, when the heating operation is performed until immediately before the start of the defrosting operation, the refrigerant storage device 16 may be regarded as being heated and the second flow rate adjusting device 18 may be controlled to be fully opened. On the other hand, if the heating operation is not performed until immediately before the start of the defrosting operation and the heating operation is stopped before the defrosting operation is started, it is considered that the refrigerant storage device 16 is not heated. 2 Control may be performed to narrow the opening degree of the flow rate adjusting device 18 to the reference opening degree.

Further, the determination of whether to control to fully open the second flow rate adjusting device 18 in step S14 or to control to narrow the opening degree of the second flow rate adjusting device 18 to the reference opening in step S16 is as follows. You may make a good decision. For example, a temperature sensor is provided in the refrigerant storage device 16, and the temperature of the refrigerant storage device 16 detected by the temperature sensor is such that the refrigerant stored in the refrigerant storage device 16 flows out through the second flow rate adjusting device 18. When the temperature is equal to or higher than the threshold value, the second flow rate adjusting device 18 is controlled to be fully opened, and when the refrigerant storage device 16 detected by the temperature sensor is less than the threshold value, the second flow rate adjusting device 18 is controlled. Control may be performed to narrow down the opening degree of 18 to the reference opening degree.

Further, the amount of the refrigerant stored in the refrigerant storage device 16 determined in steps S15 and S17 may be determined based on the degree of subcooling on the outlet side of the second heat exchanger 12 in the heating operation. Further, the amount of the refrigerant stored in the refrigerant storage device 16 determined in steps S15 and S17 may be determined based on the degree of subcooling on the outlet side of the first heat exchanger 11 in the defrosting operation.

Embodiment 3.
In the third embodiment, a modification of the control of the second flow rate adjusting device 18 during the defrosting operation in the heating operation shown in the second embodiment will be described.

FIG. 7 is a flowchart of control in which the CPU 102 of the control device 100 in the third embodiment executes the defrosting operation during the heating operation. The difference between the control of FIG. 7 and the control of FIG. 6 is that step S17A is executed instead of step S17 of FIG.

In the control device 100, after the opening degree of the second flow rate adjusting device 18 is narrowed down to the reference opening degree in step S16, the reference time is taken from the time when the opening degree of the second flow rate adjusting device 18 is narrowed down to the reference opening degree by step S17A. Judge whether or not has passed. The reference time determined in step S17A is set to a time determined at the time of design when the minimum amount of refrigerant required for the defrosting operation flows out from the refrigerant storage device 16 through the third check valve 17. The reference time determined in step S17A is timed by a timer that starts counting from the time when the opening degree of the second flow rate adjusting device 18 is narrowed down to the reference opening degree in step S16 in the control device 100.

The reference time determined in step S17A is the third on the second heat exchanger 12 side in the second flow rate adjusting device 18 when the opening degree of the second flow rate adjusting device 18 is narrowed down to the reference opening in step S16. The pressure difference between the pressure in the refrigerant path F3 and the pressure in the third refrigerant path F3 on the outlet side of the third check valve 17 and the minimum amount of refrigerant required for defrosting operation are the first from the refrigerant storage device 16. 3 It may be set based on the correlation with the time discharged through the check valve 17. The reason is that the higher the pressure difference, the shorter the time for discharging the minimum amount of refrigerant required for the defrosting operation.

For example, a data table for determining the above-mentioned reference time from the above-mentioned pressure difference based on the above-mentioned correlation is stored in the memory 104. A pressure sensor for detecting the pressure in the third refrigerant path F3 on the second heat exchanger 12 side in the second flow rate adjusting device 18 and a pressure in the third refrigerant path F3 on the outlet side of the third check valve 17 are detected. A pressure sensor is provided. The control device 100 reduces the opening degree of the second flow rate adjusting device 18 to the reference opening degree in step S16, and based on the pressure detected by these pressure sensors, the control device 100 receives the second heat in the second flow rate adjusting device 18. The pressure difference between the pressure in the third refrigerant path F3 on the exchanger 12 side and the pressure in the third refrigerant path F3 on the outlet side of the third check valve 17 is calculated. Based on the pressure difference calculated in this way, the control device 100 determines the above-mentioned reference time using the data table stored in the memory 104, and determines whether or not the reference time has elapsed in step S17A.

As described above, in the third embodiment, when the defrosting operation is started, the control device 100 causes the refrigerant to flow out until the amount of the refrigerant stored in the refrigerant storage device 16 becomes equal to or less than the threshold value. In addition, the second flow rate adjusting device 18 is controlled. This makes it possible to secure the defrosting ability during the defrosting operation regardless of the state of the refrigerant storage device 16. Further, in the third embodiment, the amount of the refrigerant stored in the refrigerant storage device 16 becomes equal to or less than the threshold value by checking the elapsed time after the opening degree of the second flow rate adjusting device 18 is narrowed down to the reference opening degree. Since it is determined whether or not the refrigerant has been used, it can be easily confirmed that the amount of the refrigerant stored in the refrigerant storage device 16 is equal to or less than the threshold value.

In the first to third embodiments described above, when the third flow rate adjusting device 19 fails, the path between the first check valve 21 and the third flow rate adjusting device 19, and the third flow rate adjusting device 19. 2 Since the path between the check valve 22 and the third flow rate adjusting device 19 may be in a liquid-sealed state, a pressure relief valve is provided in these paths to send the refrigerant to the outside through the pressure relief valve. The pressure may be reduced by discharging. Further, in these paths, a plosive plate may be provided to reduce the pressure by causing the plosive plate to burst.

[Summary of embodiments]
The embodiments described above will be described again with reference to the drawings.

This disclosure relates to

refrigeration cycle devices

1, 1A. The

refrigeration cycle devices

1 and 1A include a compressor 13 provided in the first refrigerant path F1 between the first heat exchanger 11 and the second heat exchanger 12, and the first heat exchanger 11 and the second heat exchange. The first flow rate adjusting device 14 provided in the second refrigerant path F2 between the device 12 and the first heat exchanger 11 and the second heat exchanger 12 are parallel to a part of the second refrigerant path F2. A refrigerant storage device 16 provided in the third refrigerant path F3 connected to the third refrigerant path F3 and capable of storing the refrigerant flowing in from the second refrigerant path F2, and a second refrigerant path F2 and a refrigerant storage device provided in the third refrigerant path F3. A second flow rate adjusting device 18 that adjusts the flow rate of the refrigerant between the 16 and the second flow rate so as to block the inflow of the refrigerant from the second refrigerant path F2 to the refrigerant storage device 16 when the cooling operation is started. A control device 100 for controlling the adjusting device 18 is provided.

With such a configuration, when the cooling operation is started, the second flow rate adjusting device 18 is controlled so as to block the inflow of the refrigerant from the second refrigerant path F2 to the refrigerant storage device 16, so that the outside air is used. It is possible to prevent the refrigerant from flowing into the refrigerant storage device 16 when the cooling operation is started in a state where the temperature is extremely low. Thereby, in the refrigerating cycle apparatus of the present disclosure, it is possible to prevent the refrigerating cycle apparatus from being insufficient in the amount of the refrigerant and the function of the refrigerating cycle apparatus from being deteriorated in the cooling operation.

Preferably, the first flow rate adjusting device 14 is controlled by the control device 100 so as to adjust the flow rate of the refrigerant in both the cooling operation and the heating operation. With such a configuration, the first flow rate adjusting device 14 adjusts the flow rate of the refrigerant in both the cooling operation and the heating operation, so that the inflow of the refrigerant from the second refrigerant path F2 to the refrigerant storage device 16 is blocked. Even if the second flow rate adjusting device 18 is newly provided, it is possible to prevent the number of output ports required for controlling the actuator from increasing in the control board of the control device 100.

More preferably, the third flow rate adjusting device 19 and the second refrigerant path F2 provided in the fourth refrigerant path for supplying the liquid refrigerant to the compressor 13 between the second refrigerant path F2 and the suction side of the compressor 13. The second heat in the first branch path F41 and the second refrigerant path F2 branched from the path between the first heat exchanger and the first flow rate adjusting device 14 and connected to the inlet side of the third flow rate adjusting device 19. A third flow rate of liquid refrigerant in the second branch path F42 and the first branch path F41 branched from the path between the exchanger and the first flow rate adjusting device 14 and connected to the inlet side of the third flow rate adjusting device 19. The second check valve 21 that supplies the liquid refrigerant in one direction to the inlet side of the adjusting device 19 and the second check valve that supplies the liquid refrigerant in the second branch path F42 in one direction to the inlet side of the third flow rate adjusting device 19. Further provided with a valve 22. With such a configuration, in the second refrigerant path F2, the liquid refrigerant flows from the first branch path F41 to the third flow rate adjusting device 19 via the first check valve 21 during the cooling operation, and is liquid during the heating operation. Since the liquid from the second branch path F42 flows from the second branch path F42 to the third flow rate adjusting device 19 via the second check valve 22, one first flow rate adjusting device 14 provides a flow rate adjusting device for cooling and a flow rate adjusting device for heating. Even in the case of combined use, the liquid refrigerant can always be supplied to the compressor 13 via the third flow rate adjusting device 19.

More preferably, the discharge temperature sensor 51 for detecting the temperature on the discharge side of the compressor 13 is further provided, and the control device 100 is in the case where the temperature on the discharge side of the compressor 13 detected by the discharge temperature sensor 51 exceeds the threshold value. In addition, the third flow rate adjusting device 19 is controlled to be in the open state. With such a configuration, even when a refrigerant such as R32 refrigerant whose temperature tends to rise is used, the compressor 13 can be prevented from becoming overheated.

More preferably, the first flow rate adjusting device 14 is provided at a position parallel to the refrigerant storage device 16 in the second refrigerant path F2 and is provided in the third refrigerant path F3 to exchange the refrigerant in the refrigerant storage device 16 with the first heat. Further, a third check valve for flowing out in one direction to the second refrigerant path F2 between the device and the first flow rate adjusting device 14 is further provided, and when the defrosting operation is started, the control device 100 is a refrigerant storage device. The second flow rate adjusting device 18 is controlled so that the refrigerant flows out until the amount of the refrigerant stored in 16 becomes equal to or less than the threshold value. With such a configuration, it is possible to secure the defrosting ability during the defrosting operation regardless of the state of the refrigerant storage device 16.

More preferably, when a storage amount detection sensor for detecting the storage amount of the refrigerant in the refrigerant storage device 16 is further provided and the defrosting operation is started, the control device 100 adjusts to the storage amount of the refrigerant detected by the storage amount detection sensor. Based on this, the second flow rate adjusting device 18 is controlled so that the refrigerant flows out from the refrigerant storage device 16 through the second flow rate adjusting device 18 until the amount of the refrigerant stored in the refrigerant storage device 16 becomes equal to or less than the threshold value. With such a configuration, the refrigerant stored in the refrigerant storage device 16 can be discharged while the refrigerant storage device 16 has a relatively high temperature.

More preferably, when a storage amount detection sensor for detecting the storage amount of the refrigerant in the refrigerant storage device 16 is further provided and the defrosting operation is started, the control device 100 adjusts to the storage amount of the refrigerant detected by the storage amount detection sensor. Based on this, the second flow rate adjusting device 18 is controlled so that the refrigerant flows out from the refrigerant storage device 16 through the third check valve until the amount of the refrigerant stored in the refrigerant storage device 16 becomes equal to or less than the threshold value. With such a configuration, the refrigerant stored in the refrigerant storage device 16 can be discharged while the refrigerant storage device 16 is at a relatively low temperature.

More preferably, when the defrosting operation is started, the control device 100 controls the refrigerant for a predetermined time so that the refrigerant flows out until the amount of the refrigerant stored in the refrigerant storage device 16 becomes equal to or less than the threshold value. The second flow rate adjusting device 18 is controlled so that the refrigerant flows out from the storage device 16 through the third check valve 17. It can be easily confirmed that the amount of the refrigerant stored in the refrigerant storage device 16 is equal to or less than the threshold value.

As described above, in the refrigerating cycle device 1 of the first embodiment, the refrigerating cycle device 1A of the second embodiment, and the refrigerating cycle device 1A of the third embodiment, when the cooling operation is started, the second refrigerant is used. Since the second flow rate adjusting device 18 is controlled so as to block the inflow of the refrigerant from the path F2 to the refrigerant storage device 16, the refrigerant is introduced into the refrigerant storage device 16 when the cooling operation is started in a state where the outside air temperature is extremely low. It is possible to prevent the inflow. Thereby, in the refrigerating cycle apparatus of the present disclosure, it is possible to prevent the refrigerating cycle apparatus from being insufficient in the amount of the refrigerant and the function of the refrigerating cycle apparatus from being deteriorated in the cooling operation.

The embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. The scope of the present disclosure is set forth by the scope of claims rather than the description of the embodiments described above, and is intended to include all modifications within the meaning and scope of the claims.

1,1A Refrigerant cycle device, 11 1st heat exchanger, 12 2nd heat exchanger, 10 compressor, F1 1st refrigerant path, 13 compressor, F2 2nd refrigerant path, 14 1st flow control device, F3 1st 3 refrigerant path, 18 second flow rate adjuster, 16 refrigerant storage device, 19 third flow rate adjuster, 100 control device.

Claims

With the first heat exchanger,
With the second heat exchanger,
A compressor provided in the first refrigerant path between the first heat exchanger and the second heat exchanger, and
A first flow rate adjusting device provided in the second refrigerant path between the first heat exchanger and the second heat exchanger, and
It is provided in a third refrigerant path connected in parallel with a part of the second refrigerant path between the first heat exchanger and the second heat exchanger, and stores the refrigerant flowing in from the second refrigerant path. Possible refrigerant storage and
A second flow rate adjusting device provided in the third refrigerant path to adjust the flow rate of the refrigerant between the second refrigerant path and the refrigerant storage device between the second heat exchanger and the first flow rate adjusting device. When,
A refrigeration cycle device including a control device that controls the second flow rate adjusting device so as to block the inflow of refrigerant from the second refrigerant path to the refrigerant storage device when the cooling operation is started.
The refrigeration cycle device according to claim 1, wherein the first flow rate adjusting device is controlled by the control device so as to adjust the flow rate of the refrigerant in both the cooling operation and the heating operation.
A third flow rate adjusting device provided in the fourth refrigerant path for supplying a liquid refrigerant to the compressor between the second refrigerant path and the suction side of the compressor.
A first branch path that branches from the path between the first heat exchanger and the first flow rate adjusting device in the second refrigerant path and is connected to the inlet side of the third flow rate adjusting device.
A second branch path that branches from the path between the second heat exchanger and the first flow rate adjusting device in the second refrigerant path and is connected to the inlet side of the third flow rate adjusting device.
A first check valve that supplies the liquid refrigerant in one direction to the inlet side of the third flow rate adjusting device in the first branch path.
The refrigerating cycle apparatus according to claim 2, further comprising a second check valve for supplying the liquid refrigerant in the second branch path in one direction toward the inlet side of the third flow rate adjusting device.
Further equipped with a temperature sensor for detecting the temperature on the discharge side of the compressor,
The refrigerating cycle device according to claim 3, wherein the control device controls the third flow rate adjusting device to an open state when the temperature on the discharge side of the compressor detected by the temperature sensor exceeds a threshold value. ..
The first flow rate adjusting device is provided at a position parallel to the refrigerant storage device in the second refrigerant path.
A third check that is provided in the third refrigerant path and causes the refrigerant in the refrigerant storage device to flow out in one direction to the second refrigerant path between the first heat exchanger and the first flow rate adjusting device. With more valves
When the defrosting operation is started, the control device controls the second flow rate adjusting device so that the refrigerant flows out until the amount of the refrigerant stored in the refrigerant storage device becomes equal to or less than the threshold value. The refrigeration cycle device described in.
Further, a storage amount detection sensor for detecting the storage amount of the refrigerant in the refrigerant storage device is provided.
When the defrosting operation is started, the control device uses the refrigerant storage amount detected by the storage amount detection sensor until the amount of the refrigerant stored in the refrigerant storage device becomes equal to or less than the threshold value. The refrigeration cycle device according to claim 5, wherein the second flow rate adjusting device is controlled so that the refrigerant flows out from the refrigerant storage device through the second flow rate adjusting device.
Further, a storage amount detection sensor for detecting the storage amount of the refrigerant in the refrigerant storage device is provided.
When the defrosting operation is started, the control device uses the refrigerant storage amount detected by the storage amount detection sensor until the amount of the refrigerant stored in the refrigerant storage device becomes equal to or less than the threshold value. The refrigerating cycle device according to claim 5, wherein the second flow rate adjusting device is controlled so that the refrigerant flows out from the refrigerant storage device through the third check valve.
When the defrosting operation is started, the control device is the refrigerant storage device for a predetermined time so that the refrigerant flows out until the amount of the refrigerant stored in the refrigerant storage device becomes equal to or less than the threshold value. The refrigeration cycle device according to claim 5, wherein the second flow rate adjusting device is controlled so that the refrigerant flows out from the third check valve.