CN115803571A

CN115803571A - Refrigeration cycle device

Info

Publication number: CN115803571A
Application number: CN202080102589.XA
Authority: CN
Inventors: 仲岛孔明
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2023-03-14
Also published as: US20230175744A1; JP7357793B2; JPWO2022009312A1; EP4180742A4; EP4180742A1; AU2020457289B2; WO2022009312A1; AU2020457289A1

Abstract

The refrigeration cycle device is provided with a compressor (10), a 1 st heat exchanger (20), a pressure reduction device (30), a 2 nd heat exchanger (40), a 1 st switching valve (60), a 2 nd switching valve (70), and a control device. The 1 st switching valve is switched to any one of a 1 st state in which the 1 st heat exchanger is connected to the discharge port of the compressor and a 2 nd state in which the 2 nd heat exchanger is connected to the discharge port of the compressor. The 2 nd switching valve is switched to any one of a 3 rd state in which the suction port of the compressor is connected to the 2 nd heat exchanger, a 4 th state in which the suction port of the compressor is connected to the 1 st heat exchanger, and a 5 th state in which the suction port of the compressor is connected to the decompression device. When a request for switching to a 2 nd cooling operation in which a 1 st switching valve and a 2 nd switching valve are set to a 2 nd state and a 4 th state, respectively, is made during a 1 st cooling operation in which the 1 st switching valve and the 2 nd switching valve are set to the 1 st state and the 3 rd state, respectively, a control device performs the 1 st switching operation in which the 1 st switching valve is set to the 2 nd state and the 2 nd switching valve is set to the 5 th state, and then switches to the 2 nd cooling operation.

Description

Refrigeration cycle device

Technical Field

The present disclosure relates to a refrigeration cycle device.

Background

Japanese patent laying-open No. 2005-134099 (patent document 1) discloses a refrigeration cycle apparatus including a refrigerant circuit having a compressor, a 1 st heat exchanger, a pressure reducing device, a 2 nd heat exchanger, and a flow path switching valve. In this refrigeration cycle apparatus, the 1 st operation and the 2 nd operation can be switched by switching the state of the flow path switching valve, and in the 1 st operation, the refrigerant is circulated in the order of the compressor, the 1 st heat exchanger, the pressure reducing device, and the 2 nd heat exchanger, and in the 2 nd operation, the refrigerant is circulated in the order of the compressor, the 2 nd heat exchanger, the pressure reducing device, and the 1 st heat exchanger.

Documents of the prior art

Patent literature

Patent document 1: japanese patent laid-open publication No. 2005-134099

Disclosure of Invention

Problems to be solved by the invention

In the above-described 1 st operation and 2 nd operation, the pressure distribution of the refrigerant is different. Specifically, in the 1 st operation, the high-pressure refrigerant is distributed in the 1 st heat exchanger and the low-pressure refrigerant is distributed in the 2 nd heat exchanger, while in the 2 nd operation, the high-pressure refrigerant is distributed in the 2 nd heat exchanger and the low-pressure refrigerant is distributed in the 1 st heat exchanger. Therefore, when switching from one of the 1 st operation and the 2 nd operation to the other, the pressure distribution of the refrigerant is broken, and under the influence of this, the time required until the refrigeration cycle is stabilized after the operation switching may become long.

The present disclosure has been made to solve the above-described problems, and an object of the present disclosure is to shorten the time required until a refrigeration cycle is stabilized after operation switching in a refrigeration cycle apparatus capable of switching operation between a 1 st operation in which a refrigerant is circulated in the order of a compressor, a 1 st heat exchanger, a pressure reducing device, and a 2 nd heat exchanger, and a 2 nd operation in which a refrigerant is circulated in the order of a compressor, a 2 nd heat exchanger, a pressure reducing device, and a 1 st heat exchanger.

Means for solving the problems

The refrigeration cycle apparatus of the present disclosure is capable of switching between a 1 st operation in which a refrigerant is circulated in the order of a compressor, a 1 st heat exchanger, a pressure reducing device, and a 2 nd heat exchanger, and a 2 nd operation in which a refrigerant is circulated in the order of a compressor, a 2 nd heat exchanger, a pressure reducing device, and a 1 st heat exchanger, and includes: a 1 st switching valve connected to a discharge port of the compressor, one port of the 1 st heat exchanger, one port of the 2 nd heat exchanger, and one port of the pressure reducing device; a 2 nd switching valve connected to a suction port of the compressor, the other port of the 1 st heat exchanger, the other port of the 2 nd heat exchanger, and the other port of the pressure reducing device; and a control device that controls the 1 st switching valve and the 2 nd switching valve.

The 1 st switching valve is configured to be switchable between any of a 1 st state and a 2 nd state, the 1 st state being a state in which the discharge port of the compressor is connected to one port of the 1 st heat exchanger and one port of the 2 nd heat exchanger is connected to one port of the pressure reducing device, and the 2 nd state being a state in which the discharge port of the compressor is connected to one port of the 2 nd heat exchanger and one port of the 1 st heat exchanger is connected to one port of the pressure reducing device.

The 2 nd switching valve is configured to be switchable to any of a 3 rd state, a 4 th state, and a 5 th state, the 3 rd state being a state in which the other port of the 1 st heat exchanger is connected to the other port of the pressure reducing device and the other port of the 2 nd heat exchanger is connected to the suction port of the compressor, the 4 th state being a state in which the other port of the 2 nd heat exchanger is connected to the other port of the pressure reducing device and the other port of the 1 st heat exchanger is connected to the suction port of the compressor, and the 5 th state being a state in which the other port of the pressure reducing device is connected to the suction port of the compressor and the other port of the 1 st heat exchanger is disconnected from the other port of the 2 nd heat exchanger.

The control device sets the 1 st switching valve to the 1 st state and the 2 nd switching valve to the 3 rd state in the 1 st operation, and sets the 1 st switching valve to the 2 nd state and the 2 nd switching valve to the 4 th state in the 2 nd operation.

When switching to the 2 nd operation is requested during the 1 st operation, the control device performs the 1 st switching operation in which the 1 st switching valve is set to the 2 nd state and the 2 nd switching valve is set to the 5 th state, and after the 1 st switching operation is performed, switches the operation of the refrigeration cycle apparatus to the 2 nd operation.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present disclosure, in a refrigeration cycle apparatus capable of switching operation between a 1 st operation in which a refrigerant is circulated in the order of a compressor, a 1 st heat exchanger, a pressure reducing device, and a 2 nd heat exchanger, and a 2 nd operation in which a refrigerant is circulated in the order of a compressor, a 2 nd heat exchanger, a pressure reducing device, and a 1 st heat exchanger, a time required until the refrigeration cycle is stable after the operation switching can be shortened.

Drawings

Fig. 1 is a diagram schematically showing an example of the overall configuration of a refrigeration cycle apparatus according to embodiment 1.

Fig. 2 is a perspective view showing an example of the internal structure of the 2 nd switching valve.

Fig. 3 is a view showing the rotational position of the valve body in the case where the 2 nd switching valve is in the 3 rd state.

Fig. 4 is a view showing the rotational position of the valve body in the case where the 2 nd switching valve is in the 4 th state.

Fig. 5 is a view showing the rotational position of the valve body in the case where the 2 nd switching valve is in the 5 th state.

Fig. 6 is a diagram (1) showing a state in the 1 st cooling operation of the refrigerant circuit.

Fig. 7 is a diagram (1 thereof) showing a state in the 2 nd cooling operation of the refrigerant circuit.

Fig. 8 is a diagram (1) showing a state in the 1 st switching operation of the refrigerant circuit.

Fig. 9 is a diagram (1 thereof) showing a state in the 2 nd switching operation of the refrigerant circuit.

Fig. 10 is a diagram illustrating an example of transition of the operation state of the refrigeration cycle apparatus.

Fig. 11 is a diagram (2) showing a state in the 1 st cooling operation of the refrigerant circuit.

Fig. 12 is a diagram (2) showing a state in the 1 st switching operation of the refrigerant circuit.

Fig. 13 is a diagram (2) showing a state in the 2 nd cooling operation of the refrigerant circuit.

Fig. 14 is a diagram (2 thereof) showing a state in the 2 nd switching operation of the refrigerant circuit.

Fig. 15 is a diagram (3) showing a state in the 1 st cooling operation of the refrigerant circuit.

Fig. 16 is a diagram (fig. 3) showing a state in the 1 st switching operation of the refrigerant circuit.

Fig. 17 is a diagram (fig. 3) showing a state in the 2 nd cooling operation of the refrigerant circuit.

Fig. 18 is a diagram (3) showing a state in the 2 nd switching operation of the refrigerant circuit.

Fig. 19 is a diagram (1) showing a configuration example of the 1 st air blowing device and the 2 nd air blowing device.

Fig. 20 is a view (2) showing a configuration example of the 1 st air blowing device and the 2 nd air blowing device.

Fig. 21 is a diagram (3) showing a configuration example of the 1 st air blowing device and the 2 nd air blowing device.

Fig. 22 is a diagram (4) showing a configuration example of the 1 st air blowing device and the 2 nd air blowing device.

Fig. 23 is a diagram (5) showing a configuration example of the 1 st air blowing device and the 2 nd air blowing device.

Fig. 24 is a diagram (6) showing a configuration example of the 1 st air blowing device and the 2 nd air blowing device.

Detailed Description

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

Embodiment 1.

[ description of the Structure ]

Fig. 1 is a diagram schematically showing an example of the overall configuration of a refrigeration cycle apparatus 1 according to embodiment 1. The refrigeration cycle apparatus 1 includes a refrigerant circuit RC, a 1 st air blowing device 80, a 2 nd air blowing device 90, and a control device 100. The refrigerant circuit RC includes a compressor 10, a 1 st heat exchanger 20, a pressure reducing device 30, a 2 nd heat exchanger 40, pipes 51 to 58, a 1 st switching valve 60, and a 2 nd switching valve 70.

The refrigerant circuit RC forms a circulation flow path through which the refrigerant circulates by connecting the compressor 10, the 1 st heat exchanger 20, the pressure reducing device 30, and the 2 nd heat exchanger 40 via the pipes 51 to 58, the 1 st switching valve 60, and the 2 nd switching valve 70. The refrigerant, such as carbon dioxide and R410A, that undergoes a phase change circulates through the refrigerant circuit RC.

A suction port of the compressor 10 is connected to the pipe 58, and a discharge port of the compressor 10 is connected to the pipe 51. The compressor 10 sucks and compresses a low-pressure refrigerant from the pipe 58, and discharges the refrigerant as a high-pressure refrigerant to the pipe 51. The rotation speed of the compressor 10 is adjusted in accordance with a command from the control device 100. The compressor 10 discharges the refrigerant at a flow rate corresponding to the rotation speed. The flow rate of the refrigerant circulating in the refrigeration cycle apparatus 1 is controlled by adjusting the rotation speed (discharge flow rate) of the compressor 10.

Each of the 1 st heat exchanger 20 and the 2 nd heat exchanger 40 is a heat exchanger having a flow path through which a refrigerant flows. In the 1 st heat exchanger 20 and the 2 nd heat exchanger 40, heat exchange is performed between the refrigerant flowing through the flow paths and the air outside the flow paths, respectively.

The decompression device 30 decompresses the high-pressure refrigerant. As the pressure reducing device 30, a device including a valve body whose opening degree can be adjusted in accordance with a command from the control device 100, for example, an electronically controlled expansion valve, can be used.

The 1 st switching valve 60 is a four-way valve having: a port connected to the discharge port of the compressor 10 via a pipe 51, a port connected to one port of the 1 st heat exchanger 20 via a pipe 52, a port connected to one port of the 2 nd heat exchanger 40 via a pipe 56, and a port connected to one port of the pressure reducing device 30 via a pipe 55.

The 1 st switching valve 60 is switched to any one of the 1 st state and the 2 nd state in response to a command from the control device 100.

When the 1 st switching valve 60 is in the 1 st state, the pipe 51 is connected to the pipe 52, and the pipe 56 is connected to the pipe 55. Thereby, the discharge port of the compressor 10 is connected to one port of the 1 st heat exchanger 20, and one port of the 2 nd heat exchanger 40 is connected to one port of the pressure reducing device 30. Fig. 1 illustrates a case where the 1 st switching valve 60 is in the 1 st state.

When the 1 st switching valve 60 is in the 2 nd state, the pipe 51 is connected to the pipe 56, and the pipe 52 is connected to the pipe 55. Thereby, the discharge port of the compressor 10 is connected to one port of the 2 nd heat exchanger 40, and one port of the 1 st heat exchanger 20 is connected to one port of the pressure reducing device 30.

The 2 nd switching valve 70 is a four-way valve having: a port connected to the suction port of the compressor 10 via a pipe 58, a port connected to the other port of the 1 st heat exchanger 20 via a pipe 53, a port connected to the other port of the 2 nd heat exchanger 40 via a pipe 57, and a port connected to the other port of the pressure reducing device 30 via a pipe 54.

The 2 nd switching valve 70 is switched to any one of the 3 rd state, the 4 th state, and the 5 th state in response to a command from the control device 100.

When the 2 nd switching valve 70 is in the 3 rd state, the pipe 53 is connected to the pipe 54, and the pipe 57 is connected to the pipe 58. As a result, the other port of the 1 st heat exchanger 20 is connected to the other port of the pressure reducer 30, and the other port of the 2 nd heat exchanger 40 is connected to the suction port of the compressor 10. Fig. 1 illustrates a case where the 2 nd switching valve 70 is in the 3 rd state.

When the 2 nd switching valve 70 is in the 4 th state, the pipe 57 is connected to the pipe 54, and the pipe 53 is connected to the pipe 58. Thereby, the other port of the 2 nd heat exchanger 40 is connected to the other port of the pressure reducing device 30, and the other port of the 1 st heat exchanger 20 is connected to the suction port of the compressor 10.

When the 2 nd switching valve 70 is in the 5 th state, the pipe 54 is connected to the pipe 58, and the pipe 53 and the pipe 57 are cut off. Thereby, the suction port of the compressor 10 is connected to the other port of the decompression device 30, and the other port of the 1 st heat exchanger 20 and the other port of the 2 nd heat exchanger 40 are cut off.

Fig. 2 is a perspective view showing an example of the internal structure of the 2 nd switching valve 70. The 2 nd switching valve 70 has: a hollow cylindrical container 71 having four ports connected to the

pipes

53, 54, 57, and 58; and a cylindrical valve body 72 housed inside the container 71. The valve body 72 is configured to be rotatable about the rotary shaft 76 in response to a command from the control device 100.

Fig. 3 is a view showing the rotational position of the valve body 72 in the case where the 2 nd switching valve 70 is in the 3 rd state. Fig. 4 is a view showing the rotational position of the valve body 72 in the case where the 2 nd switching valve 70 is in the 4 th state. Fig. 5 is a view showing the rotational position of the valve body 72 in the case where the 2 nd switching valve 70 is in the 5 th state.

As shown in fig. 3 to 5, three

independent flow passages

73, 74, and 75 are formed inside the valve body 72. When the 2 nd switching valve 70 is in the 3 rd state, as shown in fig. 3, the pipe 54 and the pipe 53 are connected through the flow path 73 of the valve body 72, and the pipe 57 and the pipe 58 are connected through the flow path 74 of the valve body 72. Thereby, the other port of the 1 st heat exchanger 20 is connected to the other port of the pressure reducing device 30, and the other port of the 2 nd heat exchanger 40 is connected to the suction port of the compressor 10.

When the 2 nd switching valve 70 is in the 4 th state, as shown in fig. 4, the pipe 54 and the pipe 57 are connected through the flow path 74 of the valve body 72, and the pipe 53 and the pipe 58 are connected through the flow path 73 of the valve body 72. Thereby, the other port of the 2 nd heat exchanger 40 is connected to the other port of the pressure reducing device 30, and the other port of the 1 st heat exchanger 20 is connected to the suction port of the compressor 10.

When the 2 nd switching valve 70 is in the 5 th state, as shown in fig. 5, the pipe 54 and the pipe 58 are connected through the flow path 75 of the valve body 72, but the pipe 53 and the pipe 57 are shut off by the valve body 72. Thereby, the suction port of the compressor 10 is connected to the other port of the decompression device 30, and the other port of the 1 st heat exchanger 20 is disconnected from the other port of the 2 nd heat exchanger 40.

Returning to fig. 1, the 1 st air blowing device 80 is configured to be able to blow air on the inside of the room (hereinafter, also simply referred to as "room air") to be cooled in response to a command from the control device 100. The 1 st air blowing device 80 is configured to be capable of switching the blowing destination of the indoor air between the 1 st heat exchanger 20 and the 2 nd heat exchanger 40.

The 2 nd air blower 90 is configured to be able to blow air outside the room (hereinafter, also simply referred to as "outdoor air") that is not the cooling target in response to a command from the control device 100. The 2 nd air blower 90 is configured to be capable of switching the blowing destination of the outdoor air between the 1 st heat exchanger 20 and the 2 nd heat exchanger 40.

The control device 100 includes a CPU (Central Processing Unit), a memory, and input/output ports for inputting and outputting various signals. The control device 100 controls the respective devices (the compressor 10, the pressure reducing device 30, the 1 st switching valve 60, the 2 nd switching valve 70, the 1 st air blowing device 80, the 2 nd air blowing device 90, and the like) of the refrigeration cycle apparatus 1 based on signals from the respective sensors and devices, a program stored in a memory, and the like. The control performed by the control device 100 is not limited to software-based processing, and may be performed by dedicated hardware (electronic circuit).

[ cooling operation 1 and cooling operation 2 ]

In the refrigeration cycle apparatus 1, the 1 st cooling operation and the 2 nd cooling operation can be switched by switching the states of the 1 st switching valve 60 and the 2 nd switching valve 70.

Fig. 6 is a diagram showing a state in the 1 st cooling operation of the refrigerant circuit RC. In the 1 st cooling operation, the control device 100 operates the compressor 10, and sets the 1 st switching valve 60 to the 1 st state and the 2 nd switching valve 70 to the 3 rd state.

In the 1 st cooling operation, the refrigerant circulates through the compressor 10, the 1 st heat exchanger 20, the pressure-reducing device 30, and the 2 nd heat exchanger 40 in this order, and therefore the 1 st heat exchanger 20 functions as a condenser and the 2 nd heat exchanger 40 functions as an evaporator. More specifically, the high-temperature and high-pressure refrigerant discharged from the compressor 10 flows into the 1 st heat exchanger 20 via the 1 st switching valve 60. The high-temperature and high-pressure refrigerant exchanges heat with outside air in the 1 st heat exchanger 20, drops in temperature, and flows out of the 1 st heat exchanger 20. The refrigerant flowing out of the 1 st heat exchanger 20 is decompressed by the decompression device 30, becomes a low-temperature and low-pressure refrigerant, and then flows into the 2 nd heat exchanger 40. The low-temperature and low-pressure refrigerant exchanges heat with the outside air in the 2 nd heat exchanger 40, increases in temperature, and then flows out of the 2 nd heat exchanger 40. The refrigerant flowing out of the 2 nd heat exchanger 40 is sucked into the compressor 10 via the 2 nd switching valve 70.

Therefore, in the 1 st cooling operation, the following state is achieved: the high-pressure refrigerant is distributed through the

pipes

51 and 52, the 1 st heat exchanger 20, and the

pipes

53 and 54, and the low-pressure refrigerant is distributed through the

pipes

55 and 56, the 2 nd heat exchanger 40, and the

pipes

57 and 58.

In the 1 st cooling operation, the controller 100 controls the 1 st blower 80 and the 2 nd blower 90 such that the indoor air is delivered to the 2 nd heat exchanger 40 and the outdoor air is delivered to the 1 st heat exchanger 20. Thereby, the heat exchange between the 1 st heat exchanger 20 functioning as a condenser and the outdoor air not being the cooling target is promoted, and the heat exchange between the 2 nd heat exchanger 40 functioning as an evaporator and the indoor air being the cooling target is promoted. This enables the indoor air to be cooled to be efficiently cooled. Fig. 1 illustrates a state during the 1 st cooling operation.

Fig. 7 is a diagram showing a state in the 2 nd cooling operation of the refrigerant circuit RC. In the 2 nd cooling operation, the control device 100 operates the compressor 10, and sets the 1 st switching valve 60 to the 2 nd state and the 2 nd switching valve 70 to the 4 th state.

In the 2 nd cooling operation, the refrigerant circulates through the compressor 10, the 2 nd heat exchanger 40, the pressure reducer 30, and the 1 st heat exchanger 20 in this order, and therefore the 2 nd heat exchanger 40 functions as a condenser and the 1 st heat exchanger 20 functions as an evaporator. More specifically, the high-temperature and high-pressure refrigerant discharged from the compressor 10 flows into the 2 nd heat exchanger 40 via the 1 st switching valve 60. The high-temperature and high-pressure refrigerant exchanges heat with outside air in the 2 nd heat exchanger 40, drops in temperature, and flows out of the 2 nd heat exchanger 40. The refrigerant flowing out of the 2 nd heat exchanger 40 is decompressed by the decompression device 30, becomes a low-temperature and low-pressure refrigerant, and then flows into the 1 st heat exchanger 20. The low-temperature and low-pressure refrigerant exchanges heat with outside air in the 1 st heat exchanger 20, rises in temperature, and then flows out of the 1 st heat exchanger 20. The refrigerant flowing out of the 1 st heat exchanger 20 is sucked into the compressor 10 via the 2 nd switching valve 70.

Therefore, in the 2 nd cooling operation, the following state is achieved: the high-pressure refrigerant is distributed through the

pipes

51 and 56, the 2 nd heat exchanger 40, and the

pipes

57 and 54, and the low-pressure refrigerant is distributed through the

pipes

55 and 52, the 1 st heat exchanger 20, and the

pipes

53 and 58.

In the 2 nd cooling operation, the control device 100 controls the 1 st air blowing device 80 and the 2 nd air blowing device 90 such that the indoor air is blown to the 1 st heat exchanger 20 and the outdoor air is blown to the 2 nd heat exchanger 40. This promotes heat exchange between the 2 nd heat exchanger 40 functioning as a condenser and outdoor air that is not a cooling target, and promotes heat exchange between the 1 st heat exchanger 20 functioning as an evaporator and indoor air that is a cooling target. Thus, even in the 2 nd cooling operation, the indoor air to be cooled can be efficiently cooled.

In the 1 st cooling operation, for example, when the refrigerant temperature in the 2 nd heat exchanger 40 functioning as an evaporator becomes 0 ℃ or lower, frost adheres to the 2 nd heat exchanger 40 and makes it difficult for wind to pass through, and there is a possibility that the heat exchange efficiency in the 2 nd heat exchanger 40 deteriorates. Therefore, in the case where frost is deposited on the 2 nd heat exchanger 40 during the 1 st cooling operation (for example, in the case where the refrigerant temperature of the 2 nd heat exchanger 40 detected by a sensor (not shown) is lower than a reference value in the vicinity of 0 ℃.), the control device 100 determines that switching to the 2 nd cooling operation is requested, and switches to the 2 nd cooling operation. Thus, the 2 nd heat exchanger 40 functioning as an evaporator functions as a condenser, and therefore, frost adhering to the 2 nd heat exchanger 40 can be removed.

In the present embodiment, since the indoor air is blown to the 1 st heat exchanger 20 functioning as an evaporator in the 2 nd cooling operation, the cold air can be blown to the indoor side also in the 2 nd cooling operation.

In the 2 nd cooling operation, when frost is deposited on the 1 st heat exchanger 20 functioning as a condenser (for example, when the refrigerant temperature of the 1 st heat exchanger 20 detected by a sensor not shown is lower than a reference value in the vicinity of 0 ℃), the control device 100 determines that switching to the 1 st cooling operation is requested, and switches to the 1 st cooling operation. Thus, the 1 st heat exchanger 20 functioning as an evaporator functions as a condenser, and therefore, frost adhering to the 1 st heat exchanger 20 can be removed.

[ 1 st switching operation and 2 nd switching operation ]

As described above, in the 1 st cooling operation, the high-pressure refrigerant is distributed in the 1 st heat exchanger 20 and the low-pressure refrigerant is distributed in the 2 nd heat exchanger 40, while in the 2 nd cooling operation, the high-pressure refrigerant is distributed in the 2 nd heat exchanger 40 and the low-pressure refrigerant is distributed in the 1 st heat exchanger 20. Therefore, when one of the 1 st cooling operation and the 2 nd cooling operation is switched to the other, the pressure distribution of the refrigerant is broken, and the time required until the refrigeration cycle is stabilized after the operation switching may be increased due to the influence of the breakdown.

In view of such a problem, the control device 100 of the present embodiment performs the "1 st switching operation" in which the 1 st switching valve 60 is set to the 2 nd state and the 2 nd switching valve 70 is set to the 5 th state when the 1 st cooling operation is requested to be switched to the 2 nd cooling operation, and after the 1 st switching operation is performed for a certain period of time, switches the operation of the refrigeration cycle device 1 to the 2 nd cooling operation.

Fig. 8 is a diagram showing a state in the 1 st switching operation of the refrigerant circuit RC. As shown in fig. 8, in the 1 st switching operation, the control device 100 operates the compressor 10, and sets the 1 st switching valve 60 to the 2 nd state and the 2 nd switching valve 70 to the 5 th state.

By performing the 1 st switching operation before switching from the 1 st cooling operation to the 2 nd cooling operation, the refrigerant in the 1 st heat exchanger 20 that has become high pressure in the 1 st cooling operation can be recovered to the compressor 10 to bring the inside of the 1 st heat exchanger 20 into a low-pressure state, and the high-pressure refrigerant from the compressor 10 can be supplied to the 2 nd heat exchanger 40 that has become low pressure in the 1 st cooling operation to bring the inside of the 2 nd heat exchanger 40 into a high-pressure state. That is, before switching to the 2 nd cooling operation, the inside of the 1 st heat exchanger 20 can be brought into a low-pressure state in advance, and the inside of the 2 nd heat exchanger 40 can be brought into a high-pressure state in advance.

In particular, in the 1 st switching operation, the 2 nd switching valve 70 is brought into the 5 th state, and the other port of the 1 st heat exchanger 20 and the other port of the 2 nd heat exchanger 40 are shut off by the 2 nd switching valve 70. This prevents the high-pressure refrigerant and the low-pressure refrigerant from being mixed and equalized. Therefore, as compared with the case of simply switching from the 1 st cooling operation to the 2 nd cooling operation, the interior of the 1 st heat exchanger 20 can be brought into a low-pressure state at an early stage, and the interior of the 2 nd heat exchanger 40 can be brought into a high-pressure state at an early stage.

In the 1 st switching operation, the control device 100 stops the air blowing from the 1 st air blowing device 80 and the 2 nd air blowing device 90. Accordingly, in the 1 st switching operation, the air blowing to the 1 st heat exchanger 20 and the 2 nd heat exchanger 40 is stopped, and therefore, the 1 st heat exchanger 20 can be brought into a low-pressure state earlier and the 2 nd heat exchanger 40 can be brought into a high-pressure state earlier.

After the 1 st switching operation is performed for a certain period of time, the control device 100 switches the operation of the refrigeration cycle device 1 to the 2 nd cooling operation. Therefore, the time required until the refrigeration cycle is stabilized after switching to the 2 nd cooling operation can be shortened.

In addition, when the switching to the 1 st cooling operation is requested during the 2 nd cooling operation, the control device 100 of the present embodiment performs the "2 nd switching operation" in which the 1 st switching valve 60 is set to the 1 st state and the 2 nd switching valve 70 is set to the 5 th state, and after the 2 nd switching operation is performed for a certain period of time, switches to the 1 st cooling operation.

Fig. 9 is a diagram showing a state in the 2 nd switching operation of the refrigerant circuit RC. As shown in fig. 9, in the 2 nd switching operation, the control device 100 operates the compressor 10, and sets the 1 st switching valve 60 to the 1 st state and the 2 nd switching valve 70 to the 5 th state.

By performing the 2 nd switching operation before switching from the 2 nd cooling operation to the 1 st cooling operation, the refrigerant in the 2 nd heat exchanger 40 that has become high pressure in the 2 nd cooling operation can be recovered to the compressor 10 to bring the inside of the 2 nd heat exchanger 40 into a low pressure state, and the high-pressure refrigerant from the compressor 10 can be supplied to the 1 st heat exchanger 20 that has become low pressure in the 2 nd cooling operation to bring the inside of the 1 st heat exchanger 20 into a high pressure state. That is, before switching to the 1 st cooling operation, the inside of the 2 nd heat exchanger 40 can be brought into a low-pressure state in advance, and the inside of the 1 st heat exchanger 20 can be brought into a high-pressure state in advance.

In particular, in the 2 nd switching operation, the 2 nd switching valve 70 is set to the 5 th state, and the other port of the 1 st heat exchanger 20 and the other port of the 2 nd heat exchanger 40 are shut off by the 2 nd switching valve 70. This prevents the high-pressure refrigerant and the low-pressure refrigerant from being mixed and equalized. Therefore, the pressure in the 2 nd heat exchanger 40 can be set to a low pressure state as soon as possible, and the pressure in the 1 st heat exchanger 20 can be set to a high pressure state as soon as possible.

In the 2 nd switching operation, the control device 100 stops the air blowing from the 1 st air blowing device 80 and the 2 nd air blowing device 90. Accordingly, in the 2 nd switching operation, since the air blowing to the 1 st heat exchanger 20 and the 2 nd heat exchanger 40 is stopped, the inside of the 2 nd heat exchanger 40 can be brought into a low pressure state earlier and the inside of the 1 st heat exchanger 20 can be brought into a high pressure state earlier.

After the 2 nd switching operation is performed for a certain period of time, the control device 100 switches the operation of the refrigeration cycle apparatus 1 to the 1 st cooling operation. Therefore, the time required until the refrigeration cycle is stabilized after switching to the 1 st cooling operation can be shortened.

Fig. 10 is a diagram illustrating an example of transition of the operation state of the refrigeration cycle apparatus 1 controlled by the control device 100. In fig. 10, the horizontal axis represents time, and the vertical axis represents, in order from the top, the state of the compressor 10, the state of the 1 st switching valve 60, the state of the 2 nd switching valve 70, the blowing destination of the indoor air, and the blowing destination of the outdoor air.

Before time t1, the 1 st cooling operation is performed. In the 1 st cooling operation, the control device 100 sets the 1 st switching valve 60 to the 1 st state and sets the 2 nd switching valve 70 to the 3 rd state. Further, control device 100 controls blower device 1 such that the blowing destination of the indoor air is heat exchanger 2 40, and controls blower device 2 such that the blowing destination of the outdoor air is heat exchanger 1 20.

When a request for switching to the 2 nd cooling operation is made at time t1 during the 1 st cooling operation, the control device 100 switches the operation of the refrigeration cycle device 1 from the 1 st cooling operation to the 1 st switching operation. Specifically, the control device 100 switches the 1 st switching valve 60 from the 1 st state to the 2 nd state, and switches the 2 nd switching valve 70 from the 3 rd state to the 5 th state. Further, control device 100 stops the blowing of the indoor air by 1 st blowing device 80 and stops the blowing of the outdoor air by 2 nd blowing device 90.

At time t2 when a certain time has elapsed since the start of the 1 st switching operation, the control device 100 switches the operation of the refrigeration cycle device 1 from the 1 st switching operation to the 2 nd cooling operation. Specifically, the control device 100 maintains the 1 st switching valve 60 in the 2 nd state, and switches the 2 nd switching valve 70 from the 5 th state to the 4 th state. Further, the control device 100 controls the 1 st air blowing device 80 so as to switch the blowing destination of the indoor air from the 2 nd heat exchanger 40 to the 1 st heat exchanger 20, and controls the 2 nd air blowing device 90 so as to switch the blowing destination of the outdoor air from the 1 st heat exchanger 20 to the 2 nd heat exchanger 40.

When switching to the 1 st cooling operation is requested at time t3 during the 2 nd cooling operation, the control device 100 switches the operation of the refrigeration cycle device 1 from the 2 nd cooling operation to the 2 nd switching operation. Specifically, the control device 100 switches the 1 st switching valve 60 from the 2 nd state to the 1 st state, and switches the 2 nd switching valve 70 from the 4 th state to the 5 th state. Further, control device 100 stops the blowing of the indoor air by 1 st blowing device 80 and stops the blowing of the outdoor air by 2 nd blowing device 90.

At time t4 when a certain time has elapsed since the start of the 2 nd switching operation, the control device 100 switches the operation of the refrigeration cycle device 1 from the 2 nd switching operation to the 1 st cooling operation. Specifically, the control device 100 maintains the 1 st switching valve 60 in the 1 st state, and switches the 2 nd switching valve 70 from the 5 th state to the 3 rd state. Further, the control device 100 controls the 1 st air blowing device 80 so as to switch the blowing destination of the indoor air from the 1 st heat exchanger 20 to the 2 nd heat exchanger 40, and controls the 2 nd air blowing device 90 so as to switch the blowing destination of the outdoor air from the 2 nd heat exchanger 40 to the 1 st heat exchanger 20.

After time t5, the same switching as that until time t5 is performed.

As described above, when the 1 st cooling operation requests the switching to the 2 nd cooling operation, the control device 100 of the present embodiment performs the "1 st switching operation" in which the 1 st switching valve 60 is set to the 2 nd state and the 2 nd switching valve 70 is set to the 5 th state for a certain period of time before switching to the 2 nd cooling operation. As a result, compared to the case of simply switching from the 1 st cooling operation to the 2 nd cooling operation, it is possible to prevent the high-pressure refrigerant and the low-pressure refrigerant from being mixed and equalizing pressure at the time of operation switching, and it is possible to switch to the 2 nd cooling operation after a state close to the pressure distribution of the 2 nd cooling operation is formed in advance. Therefore, the time required until the refrigeration cycle is stabilized after switching to the 2 nd cooling operation can be shortened. As a result, the energy consumed to stabilize the refrigeration cycle after switching to the 2 nd cooling operation can be reduced, and energy saving of the refrigeration cycle apparatus 1 can be achieved.

In addition, when the switching to the 1 st cooling operation is requested during the 2 nd cooling operation, the control device 100 of the present embodiment performs the "2 nd switching operation" in which the 1 st switching valve 60 is set to the 1 st state and the 2 nd switching valve 70 is set to the 5 th state for a certain period of time before switching to the 1 st cooling operation. As a result, compared to the case of simply switching from the 2 nd cooling operation to the 1 st cooling operation, it is possible to prevent the high-pressure refrigerant and the low-pressure refrigerant from being mixed and equalizing pressure at the time of operation switching, and it is possible to switch to the 1 st cooling operation after a state in which a pressure distribution close to that of the 1 st cooling operation is formed in advance. Therefore, the time required until the refrigeration cycle is stabilized after switching to the 1 st cooling operation can be shortened. As a result, the energy consumed to stabilize and idle the refrigeration cycle after switching to the 1 st cooling operation can be reduced, and energy saving of the refrigeration cycle apparatus 1 can be achieved.

Embodiment 2.

Fig. 11 to 14 schematically illustrate an example of the configuration of the refrigerant circuit RCa of the refrigeration cycle apparatus according to embodiment 2. The refrigerant circuit RCa in embodiment 2 is obtained by adding the pressure reducing device 32 and the 3 rd heat exchanger 42 to the refrigerant circuit RC in embodiment 1. The other structure of the refrigerant circuit RCa is the same as the refrigerant circuit RC. The other configurations and operations of the refrigeration cycle apparatus according to embodiment 2 are the same as those of the refrigeration cycle apparatus 1 shown in fig. 1.

The pressure reducing device 32 and the 3 rd heat exchanger 42 are disposed between the 2 nd switching valve 70 and the suction port of the compressor 10.

The decompressor 32 decompresses the refrigerant from the 2 nd switching valve 70 and outputs the decompressed refrigerant to the 3 rd heat exchanger 42. As the pressure reducing device 32, a device including a valve body whose opening degree can be adjusted in accordance with a command from the control device 100, for example, an electronic control type expansion valve can be used.

The 3 rd heat exchanger 42 exchanges heat between the refrigerant decompressed by the decompression device 32 and the outside air.

Fig. 11 is a diagram showing a state of the refrigerant circuit RCa in the 1 st cooling operation. Fig. 12 is a diagram showing a state in the 1 st switching operation of the refrigerant circuit RCa. Fig. 13 is a diagram showing a state of the refrigerant circuit RCa in the 2 nd cooling operation. Fig. 14 is a diagram showing a state in the 2 nd switching operation of the refrigerant circuit RCa.

The states of the compressor 10, the 1 st switching valve 60, the 2 nd switching valve 70, the 1 st air blowing device 80, and the 2 nd air blowing device 90 during the respective operations are basically controlled in the same manner as in embodiment 1 described above.

However, in the refrigerant circuit RCa according to embodiment 2, the decompression device 32 is added, so that the following states are achieved in each operation: the high-pressure refrigerant is distributed in a circuit from the discharge port of the compressor 10 to the decompression device 30, the intermediate-pressure refrigerant is distributed in a circuit from the decompression device 30 to the decompression device 32, and the low-pressure refrigerant is distributed in a circuit from the decompression device 32 to the suction port of the compressor 10.

As shown in fig. 11, the refrigerant circuit RCa of embodiment 2 is configured to blow the indoor air in the order of the 2 nd heat exchanger 40 and the 3 rd heat exchanger 42 in the 1 st cooling operation. That is, in the 1 st cooling operation, when the 2 nd heat exchanger 40 and the 3 rd heat exchanger 42 function as evaporators, the indoor air is blown to the 3 rd heat exchanger 42 after passing through the 2 nd heat exchanger 40.

As described above, in embodiment 2, in the 1 st cooling operation, the indoor air is blown in the order of the 2 nd heat exchanger 40 and the 3 rd heat exchanger 42. Therefore, of the 2 nd heat exchanger 40 and the 3 rd heat exchanger 42 that function as evaporators (that is, to which frost may adhere) in the 1 st cooling operation, frost can be caused to actively adhere to the 2 nd heat exchanger 40 that functions as a condenser after switching to the 2 nd cooling operation, and frost can be made less likely to adhere to the 3 rd heat exchanger 42 that functions as an evaporator also after switching to the 2 nd cooling operation. As a result, when switching to the 2 nd cooling operation and defrosting is performed thereafter, only the 2 nd heat exchanger 40 to which much frost adheres can be defrosted, and therefore, efficient defrosting operation can be performed.

As shown in fig. 13, the refrigerant circuit RCa of embodiment 2 blows the indoor air in the order of the 1 st heat exchanger 20 and the 3 rd heat exchanger 42 in the 2 nd cooling operation. That is, in the 2 nd cooling operation, when the 1 st heat exchanger 20 and the 3 rd heat exchanger 42 function as evaporators, the indoor air is blown to the 3 rd heat exchanger 42 after passing through the 1 st heat exchanger 20.

As described above, in embodiment 2, in the 2 nd cooling operation, the indoor air is blown in the order of the 1 st heat exchanger 20 and the 3 rd heat exchanger 42. Therefore, of the 1 st heat exchanger 20 and the 3 rd heat exchanger 42 that function as evaporators (that is, to which frost may adhere) in the 2 nd cooling operation, frost can be caused to adhere positively to the 1 st heat exchanger 20 that functions as a condenser after switching to the 1 st cooling operation, and frost is made less likely to adhere to the 3 rd heat exchanger 42 that functions as an evaporator also after switching to the 1 st cooling operation. As a result, when switching to the 1 st cooling operation and defrosting is performed thereafter, only the 1 st heat exchanger 20 to which much frost adheres can be defrosted, and therefore, efficient defrosting operation can be performed.

In the refrigerant circuit RCa of embodiment 2, an adsorbent (a desiccant material or the like) that adsorbs moisture in the air may be applied to the surfaces of the 1 st heat exchanger 20 and the 2 nd heat exchanger 40 in advance. Accordingly, moisture in the air is adsorbed by the 1 st heat exchanger 20 or the 2 nd heat exchanger 40, and thus, frost can be prevented from adhering to the 3 rd heat exchanger 42.

For example, in the 2 nd cooling operation in which the 1 st heat exchanger 20 functions as an evaporator, moisture in the indoor air is adsorbed by the adsorbent of the 1 st heat exchanger 20 when passing through the 1 st heat exchanger 20, and therefore the indoor air blown to the 3 rd heat exchanger 42 after passing through the 1 st heat exchanger 20 is in a dry state. As a result, frost can be less likely to adhere to the 3 rd heat exchanger 42.

After that, the operation is switched to the 1 st cooling operation, and the 1 st heat exchanger 20 functions as a condenser, so that moisture contained in the adsorbent of the 1 st heat exchanger 20 can be released into the outdoor air. As a result, the adsorbent in the 1 st heat exchanger 20 is dried, and therefore, when the 2 nd cooling operation is switched again and the 1 st heat exchanger 20 functions as an evaporator, the adsorbent in the 1 st heat exchanger 20 can adsorb moisture in the indoor air again.

Embodiment 3.

Fig. 15 to 18 schematically illustrate an example of the configuration of the refrigerant circuit RCb of the refrigeration cycle apparatus according to embodiment 3. The refrigerant circuit RCb of embodiment 3 is obtained by adding the 4 th heat exchanger 44 to the refrigerant circuit RCa of embodiment 2 described above. The other structure of the refrigerant circuit RCb is the same as that of the refrigerant circuit RCa. Other configurations and operations of the refrigeration cycle apparatus according to embodiment 3 are the same as those of the refrigeration cycle apparatus 1 shown in fig. 1 described above.

The 4 th heat exchanger 44 is disposed between the discharge port of the compressor 10 and the 1 st switching valve 60. The 4 th heat exchanger 44 exchanges heat between the refrigerant discharged from the compressor 10 and the outside air.

Fig. 15 is a diagram showing a state of the refrigerant circuit RCb during the 1 st cooling operation. Fig. 16 is a diagram showing a state in the 1 st switching operation of the refrigerant circuit RCb. Fig. 17 is a diagram showing a state in the 2 nd cooling operation of the refrigerant circuit RCb. Fig. 18 is a diagram showing a state in the 2 nd switching operation of the refrigerant circuit RCb.

The states of the compressor 10, the 1 st switching valve 60, the 2 nd switching valve 70, the 1 st air blowing device 80, and the 2 nd air blowing device 90 during the respective operations are basically controlled in the same manner as in embodiment 2 described above.

When the 1 st heat exchanger 20 or the 2 nd heat exchanger 40 is caused to function as a condenser, when frost or moisture adheres to the condenser, the heat conversion efficiency of the condenser changes depending on the amount of adhesion of the frost or moisture. Further, since the condenser is used, the amount of frost or moisture adhering may change together with the operation, and thus the high pressure inside the condenser changes from moment to moment.

In view of this, in the refrigerant circuit RCb according to embodiment 3, the 4 th heat exchanger 44 is added between the discharge port of the compressor 10 and the 1 st switching valve 60. Thus, even when the heat exchanger performance of the 1 st heat exchanger 20 or the 2 nd heat exchanger 40 changes, the high pressure can be stably maintained at a constant value.

As shown in fig. 15, the refrigerant circuit RCb according to embodiment 3 is configured such that, in the 1 st cooling operation, outdoor air passes through the 1 st heat exchanger 20 and is then blown to the 3 rd heat exchanger 42. This can promote heat exchange in the 4 th heat exchanger 44 functioning as a condenser.

[ configuration examples of the 1 st air blowing device 80 and the 2 nd air blowing device 90 ]

Hereinafter, description will be given of configuration examples of the 1 st air blowing device 80 and the 2 nd air blowing device 90 used in the refrigeration cycle apparatuses in embodiments 1 to 3 described above.

Fig. 19 and 20 are diagrams showing configuration examples of the 1 st air blowing device 80 and the 2 nd air blowing device 90 suitable for the refrigeration cycle device in embodiment 1 described above. Fig. 19 shows a state during the 1 st cooling operation (see fig. 6) of embodiment 1, and fig. 20 shows a state during the 2 nd cooling operation (see fig. 7) of embodiment 1.

The 1 st blower 80 includes a fan 81, an air passage 82, and an air passage switcher 83. The fan 81 operates in accordance with a command from the control device 100 to blow indoor air into the air passage 82. The air passage 82 communicates the room to be cooled with the 1 st heat exchanger 20 and the 2 nd heat exchanger 40. The air path switcher 83 is configured to switch the path in the air path 82 in response to a command from the controller 100, and is configured to be able to switch the supply destination of the indoor air between the 1 st heat exchanger 20 and the 2 nd heat exchanger 40. The state of the air passage switcher 83 is switched by driving a motor, not shown, for example.

The 2 nd blower 90 includes a fan 91, an air passage 92, and an air passage switcher 83 shared with the 1 st blower 80. The fan 91 operates in accordance with a command from the control device 100 to blow outdoor air into the air passage 92. The air passage 92 communicates the outdoor air that is not the object of cooling with the 1 st heat exchanger 20 and the 2 nd heat exchanger 40. The air path switcher 83 is configured to switch the path in the air path 92 in response to a command from the controller 100, and is configured to be able to switch the supply destination of the outdoor air between the 1 st heat exchanger 20 and the 2 nd heat exchanger 40.

In the 1 st cooling operation, the

fans

81 and 91 are operated, and the air path switcher 83 is in the state shown in fig. 19, whereby the indoor air can be sent to the 2 nd heat exchanger 40 and the outdoor air can be sent to the 1 st heat exchanger 20. In the 2 nd cooling operation, the

fans

81 and 91 are operated, and the air path switcher 83 is in the state shown in fig. 20, whereby the indoor air can be sent to the 1 st heat exchanger 20 and the outdoor air can be sent to the 2 nd heat exchanger 40.

Fig. 21 and 22 are diagrams showing configuration examples of a 1 st air blowing device 80A and a 2 nd air blowing device 90A suitable for the refrigeration cycle apparatus in embodiment 2 described above. Fig. 21 shows a state during the 1 st cooling operation (see fig. 11) of embodiment 2, and fig. 22 shows a state during the 2 nd cooling operation (see fig. 13) of embodiment 2.

The 1 st air blowing device 80A has

air passages

82a, 82b and air passage switches 83a, 83b added to the 1 st air blowing device 80 described above. The 2 nd blower 90A has

additional air passages

92a and 92b and air passage switches 83a and 83b shared with the 1 st blower 80A to the 2 nd blower 90 described above.

The air passage 82a is formed to supply the air after passing through the 1 st heat exchanger 20 to the 3 rd heat exchanger 42. The air passage 82b is formed to supply the air after passing through the 2 nd heat exchanger 40 to the 3 rd heat exchanger 42. The air passage 92a is formed to supply the air after passing through the 1 st heat exchanger 20 to the outside. The air passage 92b is formed to supply the air after passing through the 2 nd heat exchanger 40 to the outside.

The air path switcher 83a is configured to be able to switch the supply destination of the air having passed through the 1 st heat exchanger 20 between the air path 82a and the air path 92a in accordance with a command from the controller 100. The air passage switcher 83b is configured to be able to switch the supply destination of the air having passed through the 2 nd heat exchanger 40 between the air passage 82b and the air passage 92b in accordance with a command from the controller 100. The air path switches 83a and 83b are switched by driving a motor, not shown, for example.

In the 1 st cooling operation, by operating the

fans

81 and 91 and setting the air path switches 83, 83a, and 83b to the states shown in fig. 21, the indoor air can be blown in the order of the 2 nd heat exchanger 40 and the 3 rd heat exchanger 42, and the blowing destination of the outdoor air can be set as the 1 st heat exchanger 20. In the 2 nd cooling operation, by operating the

fans

81 and 91 and setting the air path switches 83, 83a, and 83b to the state shown in fig. 22, the indoor air can be blown in the order of the 1 st heat exchanger 20 and the 3 rd heat exchanger 42, and the blowing destination of the outdoor air can be set as the 2 nd heat exchanger 40.

Fig. 23 and 24 are diagrams showing configuration examples of a 1 st air blowing device 80A and a 2 nd air blowing device 90B suitable for the refrigeration cycle apparatus in embodiment 3 described above. Fig. 23 shows a state during the 1 st cooling operation (see fig. 15) of embodiment 3, and fig. 24 shows a state during the 2 nd cooling operation (see fig. 17) of embodiment 3.

The 1 st air blowing device 80A is the same as the 1 st air blowing device 80A shown in fig. 21 described above. The 2 nd blower 90B changes the air passages 92a and 92B of the 2 nd blower 90A shown in fig. 21 to the

air passages

92c and 92d, respectively.

The air passage 92c is formed to supply the air after passing through the 1 st heat exchanger 20 to the 4 th heat exchanger 44. The air passage 92d is formed to supply the air after passing through the 2 nd heat exchanger 40 to the 4 th heat exchanger 44.

In the 1 st cooling operation, by operating the

fans

81 and 91 and setting the air path switches 83, 83a, and 83b to the state shown in fig. 23, it is possible to blow the indoor air in the order of the 2 nd heat exchanger 40 and the 3 rd heat exchanger 42 and to blow the outdoor air in the order of the 1 st heat exchanger 20 and the 4 th heat exchanger 44. In the 2 nd cooling operation, by operating the

fans

81 and 91 and setting the air path switches 83, 83a, and 83b to the state shown in fig. 24, it is possible to blow the indoor air in the order of the 1 st heat exchanger 20 and the 3 rd heat exchanger 42 and to blow the outdoor air in the order of the 2 nd heat exchanger 40 and the 4 th heat exchanger 44.

The embodiments disclosed herein are illustrative in all respects and should not be considered as restrictive. The scope of the present disclosure is defined by the claims rather than the description above, and includes all modifications within the meaning and scope equivalent to the claims.

Description of the reference numerals

The refrigeration cycle apparatus includes a refrigeration cycle apparatus 1, a compressor 10, a heat exchanger 1, a decompressor 30, a decompressor 32, a heat exchanger 2, a heat exchanger 3, a heat exchanger 4, a pipe 51 to 58, a switching valve 1, a switching valve 60, a switching valve 2, a container 71, a valve body 72, channels 73 to 75, a rotating shaft 76, a first air blower 1, an air blower 81, a fan 91,

air passages

82, 82a, 82b, 92a, 92b, 92c, 92d, an

air passage switcher

83, 83a, 83b, an air passage switcher 2, an

air blower

90, 90A, a control device 100, and a refrigerant circuit RC, RCa, RCb.

Claims

1. A refrigeration cycle apparatus capable of switching between a 1 st operation in which a refrigerant is circulated in the order of a compressor, a 1 st heat exchanger, a pressure reducing device, and a 2 nd heat exchanger, and a 2 nd operation in which a refrigerant is circulated in the order of the compressor, the 2 nd heat exchanger, the pressure reducing device, and the 1 st heat exchanger, wherein,

the refrigeration cycle device is provided with:

a 1 st switching valve connected to a discharge port of the compressor, one port of the 1 st heat exchanger, one port of the 2 nd heat exchanger, and one port of the pressure reducing device;

a 2 nd switching valve connected to a suction port of the compressor, the other port of the 1 st heat exchanger, the other port of the 2 nd heat exchanger, and the other port of the pressure reducing device; and

a control device that controls the 1 st switching valve and the 2 nd switching valve,

the 1 st switching valve is configured to be switchable between any of a 1 st state and a 2 nd state, the 1 st state being a state in which the discharge port of the compressor is connected to the one port of the 1 st heat exchanger and the one port of the 2 nd heat exchanger is connected to the one port of the pressure reducing device, the 2 nd state being a state in which the discharge port of the compressor is connected to the one port of the 2 nd heat exchanger and the one port of the 1 st heat exchanger is connected to the one port of the pressure reducing device,

the 2 nd switching valve is configured to be switchable to any one of a 3 rd state, a 4 th state, and a 5 th state, the 3 rd state being a state in which the other port of the 1 st heat exchanger is connected to the other port of the decompressor and the other port of the 2 nd heat exchanger is connected to the suction port of the compressor, the 4 th state being a state in which the other port of the 2 nd heat exchanger is connected to the other port of the decompressor and the other port of the 1 st heat exchanger is connected to the suction port of the compressor, the 5 th state being a state in which the other port of the decompressor is connected to the suction port of the compressor and the other port of the 1 st heat exchanger is blocked from the other port of the 2 nd heat exchanger,

the control device sets the 1 st switching valve to the 1 st state and the 2 nd switching valve to the 3 rd state in the 1 st operation, sets the 1 st switching valve to the 2 nd state and the 2 nd switching valve to the 4 th state in the 2 nd operation,

when a request for switching to the 2 nd operation is made during the 1 st operation, the control device performs a 1 st switching operation in which the 1 st switching valve is in the 2 nd state and the 2 nd switching valve is in the 5 th state, and switches the operation of the refrigeration cycle apparatus to the 2 nd operation after the 1 st switching operation is performed.

2. The refrigeration cycle apparatus according to claim 1,

when switching to the 1 st operation is requested during the 2 nd operation, the control device performs a 2 nd switching operation in which the 1 st switching valve is set to the 1 st state and the 2 nd switching valve is set to the 5 th state, and switches the operation of the refrigeration cycle apparatus to the 1 st operation after the 2 nd switching operation is performed.

3. The refrigeration cycle apparatus according to claim 2,

the refrigeration cycle apparatus further includes an air blowing device configured to blow air to the 1 st heat exchanger and the 2 nd heat exchanger,

the control device controls the air blowing device so that air blowing to the 1 st heat exchanger and the 2 nd heat exchanger is stopped during the 1 st switching operation and the 2 nd switching operation.

4. The refrigeration cycle apparatus according to claim 3,

the air blowing device includes a 1 st air blowing device configured to be capable of switching an air blowing destination of indoor air to be cooled to either one of the 1 st heat exchanger and the 2 nd heat exchanger,

the control device controls the 1 st air blowing device such that the air blowing destination of the indoor air is the 2 nd heat exchanger in the 1 st operation, and the air blowing destination of the indoor air is the 1 st heat exchanger in the 2 nd operation.

5. The refrigeration cycle apparatus according to claim 4, wherein,

the air blowing device comprises a 2 nd air blowing device, the 2 nd air blowing device is configured to be capable of switching the air blowing destination of outdoor air which is not a cooling object to any one of the 1 st heat exchanger and the 2 nd heat exchanger,

the control device controls the 2 nd air blowing device such that the 1 st heat exchanger is set as the destination of the outdoor air in the 1 st operation, and the 2 nd heat exchanger is set as the destination of the outdoor air in the 2 nd operation.

6. The refrigeration cycle apparatus according to claim 4 or 5, wherein,

the refrigeration cycle device further includes a 2 nd pressure reducing device and a 3 rd heat exchanger, and the 2 nd pressure reducing device and the 3 rd heat exchanger are disposed between the 2 nd switching valve and a suction port of the compressor.

7. The refrigeration cycle apparatus according to claim 6, wherein,

in the 1 st operation, the indoor air is blown in the order of the 2 nd heat exchanger and the 3 rd heat exchanger, and in the 2 nd operation, the indoor air is blown in the order of the 1 st heat exchanger and the 3 rd heat exchanger.

8. The refrigeration cycle apparatus according to claim 7, wherein,

the surfaces of the 1 st heat exchanger and the 2 nd heat exchanger are coated with an adsorbent for adsorbing moisture in the air.

9. The refrigeration cycle device according to any one of claims 6 to 8, wherein,

the refrigeration cycle device further includes a 4 th heat exchanger disposed between a discharge port of the compressor and the 1 st switching valve.