JP7662945B2 - Refrigerant quantity measurement system and refrigerant usage system - Google Patents

Description

Regarding refrigerant quantity measurement systems and refrigerant usage systems.

To repair refrigeration cycle equipment such as air conditioners, refrigerant may be charged based on the difference between the initial amount of refrigerant charged into the refrigeration cycle equipment and the amount of refrigerant recovered during repair.

Patent document 1 (JP 2010-190545 A) discloses a refrigeration device that can detect a refrigerant shortage state by using a receiver tank that is internally connected to the refrigerant circuit. The refrigeration device of Patent document 1 displays a refrigerant shortage based on the refrigerant detection value by a liquid level detection unit in the receiver tank built into the device.

The refrigeration system of Patent Document 1 detects a refrigerant shortage state by using a receiver tank that is internally connected to the refrigerant circuit. The refrigerant flows to the receiver tank built into the system even during normal operation (such as air conditioning operation). Therefore, the refrigeration system of Patent Document 1 requires an amount of refrigerant corresponding to the volume of the receiver tank in addition to the amount of refrigerant corresponding to the existing refrigerant circuit. Furthermore, the refrigeration system of Patent Document 1 causes a pressure loss of the refrigerant when it passes through the receiver tank.

This disclosure proposes a refrigerant amount measurement system that is externally connected to the refrigerant circuit of a refrigeration cycle device, and that clarifies the amount of refrigerant leakage from the start of use of the refrigeration cycle device to its disposal without causing any additional refrigerant amount or pressure loss.

The refrigerant amount measurement system of the first aspect includes a connection unit, a storage unit, a measurement unit, and a memory unit. The connection unit is connected to a first refrigerant circuit of a first refrigeration cycle device. The storage unit stores the refrigerant in the first refrigerant circuit via the connection unit and returns the stored refrigerant to the first refrigerant circuit via the connection unit. The measurement unit measures the amount of refrigerant in the storage unit. The memory unit stores the measurement results measured by the measurement unit.

This refrigerant amount measurement system stores the refrigerant in the first refrigerant circuit in a storage unit that is externally connected to the first refrigerant circuit. The refrigerant amount measurement system measures the amount of refrigerant in the storage unit and stores the measurement results. The refrigerant amount measurement system returns the stored refrigerant from the storage unit that is externally connected to the first refrigerant circuit to the first refrigerant circuit. Therefore, the refrigerant amount measurement system can clarify the amount of refrigerant leakage in the first refrigerant circuit without causing additional refrigerant amount or pressure loss.

The refrigerant amount measurement system of the second aspect is the refrigerant amount measurement system of the first aspect, in which the connection part has a first tube and a second tube. In addition, an opening/closing valve is provided in each of the first tube and the second tube.

The connection part of this refrigerant quantity measurement system has a first pipe and a second pipe. Therefore, this refrigerant quantity measurement system can be divided into the first pipe and the second pipe depending on the state of the refrigerant and connected to the first refrigerant circuit. In addition, each of the first pipe and the second pipe is provided with an on-off valve. Therefore, this refrigerant quantity measurement system can allow or block communication between the first pipe and the second pipe.

The refrigerant amount measurement system of the third aspect is the refrigerant amount measurement system of the second aspect, further comprising a control unit. The control unit performs a first refrigerant amount measurement operation. The first refrigerant amount measurement operation is an operation of controlling the first refrigeration cycle device and the on-off valve to transfer the refrigerant from the first refrigerant circuit to the storage unit, causing the measurement unit to measure the amount of refrigerant, and returning the refrigerant from the storage unit to the first refrigerant circuit.

The control unit of this refrigerant amount measurement system performs the first refrigerant amount measurement operation. Therefore, the refrigerant amount measurement system can reduce the effort required to clarify the amount of refrigerant leakage from the first refrigerant circuit.

The refrigerant amount measurement system of the fourth aspect is the refrigerant amount measurement system of the third aspect, in which the connection part is also connected to the second refrigerant circuit of the second refrigeration cycle device. The control unit further has a third tube and a fourth tube, each of which is provided with an on-off valve. Furthermore, the connection part is connected to the first refrigerant circuit by the first tube and the second tube, and is connected to the second refrigerant circuit by the third tube and the fourth tube.

The connection part of this refrigerant amount measurement system is also connected to the second refrigerant circuit of the second refrigeration cycle device. Therefore, this refrigerant amount measurement system can also clarify the amount of refrigerant leaking from the second refrigerant circuit. In addition, the connection part of this refrigerant amount measurement system has a third pipe and a fourth pipe. Therefore, this refrigerant amount measurement system can be divided into the third pipe and the fourth pipe depending on the state of the refrigerant and connected to the second refrigerant circuit. In addition, each of the third pipe and the fourth pipe is provided with an on-off valve. Therefore, this refrigerant amount measurement system can allow or block communication between the third pipe and the fourth pipe.

The refrigerant amount measurement system of the fifth aspect is the refrigerant amount measurement system of the fourth aspect, in which the control unit further performs a second refrigerant amount measurement operation. The second refrigerant amount measurement operation is an operation of controlling the second refrigeration cycle device and the on-off valve to transfer the refrigerant from the second refrigerant circuit to the storage unit, causing the measurement unit to measure the amount of the refrigerant, and returning the refrigerant from the storage unit to the second refrigerant circuit.

The control unit of this refrigerant amount measurement system further performs a second refrigerant amount measurement operation. Therefore, the refrigerant amount measurement system can also reduce the effort required to clarify the amount of refrigerant leakage from the second refrigerant circuit.

The refrigerant amount measurement system of the sixth aspect is the refrigerant amount measurement system of the fifth aspect, in which the control unit performs the first refrigerant amount measurement operation and the second refrigerant amount measurement operation at different times.

The control unit of this refrigerant amount measurement system performs the first refrigerant amount measurement operation and the second refrigerant amount measurement operation at different times. Therefore, this refrigerant amount measurement system can separate the amount of refrigerant leakage from the first refrigerant circuit and the amount of refrigerant leakage from the second refrigerant circuit and clearly indicate each of them.

The refrigerant amount measurement system of the seventh aspect is the refrigerant amount measurement system of the fifth or sixth aspect, in which the control unit performs a first refrigerant amount measurement operation during a time period when normal operation of the first refrigeration cycle device is stopped. Also, the control unit performs a second refrigerant amount measurement operation during a time period when normal operation of the second refrigeration cycle device is stopped.

The control unit of this refrigerant amount measurement system performs a first refrigerant amount measurement operation during a time period when normal operation of the first refrigeration cycle device is stopped. Therefore, this refrigerant amount measurement system is not affected by normal operation of the first refrigeration cycle device and can more clearly indicate the amount of refrigerant leakage in the first refrigerant circuit. In addition, the control unit performs a second refrigerant amount measurement operation during a time period when normal operation of the second refrigeration cycle device is stopped. Therefore, this refrigerant amount measurement system is not affected by normal operation of the second refrigeration cycle device and can more clearly indicate the amount of refrigerant leakage in the second refrigerant circuit.

The refrigerant amount measurement system of the eighth aspect is a refrigerant amount measurement system of any one of the fifth aspect to the seventh aspect, in which the control unit performs a first storage operation and a second storage operation. The first storage operation is an operation of transferring refrigerant from the first refrigerant circuit to the storage section when refrigerant leaks from the first refrigerant circuit. The second storage operation is an operation of transferring refrigerant from the second refrigerant circuit to the storage section when refrigerant leaks from the second refrigerant circuit.

The control unit of this refrigerant amount measurement system performs a first storage operation. Therefore, in the event of a leak in the first refrigerant circuit, this refrigerant amount measurement system can store the refrigerant from the first refrigerant circuit in the storage unit, thereby preventing the refrigerant from being released into the atmosphere. In addition, the control unit of this refrigerant amount measurement system performs a second storage operation. Therefore, in the event of a leak in the second refrigerant circuit, this refrigerant amount measurement system can store the refrigerant from the second refrigerant circuit in the storage unit, thereby preventing the refrigerant from being released into the atmosphere.

The refrigerant amount measurement system of the ninth aspect is a refrigerant amount measurement system of any one of the first aspect to the eighth aspect, in which the measurement unit has an electrode rod.

The measurement unit of this refrigerant quantity measurement system has an electrode rod. Therefore, this refrigerant quantity measurement system can more clearly determine the amount of refrigerant leaking by using the electrode rod.

The refrigerant amount measurement system of the tenth aspect is the refrigerant amount measurement system of the ninth aspect, in which the measurement unit further has a cylindrical member that surrounds the electrode rod.

The measurement unit of this refrigerant amount measurement system further includes a cylindrical member that surrounds the electrode rod. Therefore, this refrigerant amount measurement system can more clearly determine the amount of refrigerant leakage by using the cylindrical member.

The refrigerant amount measurement system of the eleventh aspect is a refrigerant amount measurement system of any one of the first to tenth aspects, in which the measurement unit measures the amount of refrigerant by at least one of the following methods: radio wave type, ultrasonic type, float type, pressure type, differential pressure type, and capacitance type.

The measurement unit of this refrigerant amount measurement system measures the amount of refrigerant using at least one of the following methods: radio wave, ultrasonic, float, pressure, differential pressure, or capacitance. Therefore, this refrigerant amount measurement system can more clearly determine the amount of refrigerant leaking based on a variety of methods.

A refrigerant-using system according to a twelfth aspect has a refrigerant amount measurement system according to any one of the first aspect to the eleventh aspect, and a refrigeration cycle device.

This refrigerant-using system has a refrigerant amount measurement system and a refrigeration cycle device. Therefore, this refrigerant-using system can clarify the amount of refrigerant leaking from the refrigeration cycle device included in this refrigerant-using system.

1 is a schematic diagram showing a refrigerant using system 1. FIG. FIG. 2 is a control block diagram of a control unit 140. FIG. 4 is a control block diagram of a computing device 470. 13 is a schematic diagram showing the flow of the refrigerant R in the first half of the operation of transferring the refrigerant R to the storage section 460. FIG. 13 is a schematic diagram showing the flow of the refrigerant R in the latter half of the operation of transferring the refrigerant R to the storage section 460. FIG. 4 is a schematic diagram showing a storage section 460 in which a refrigerant R is stored and an electrode rod 461. FIG. 1 is a diagram showing the relationship between capacitance C and liquid level h depending on temperature. 1 is a schematic diagram showing the flow of the refrigerant R during an operation of returning the refrigerant R to a refrigerant circulation path 150. FIG. 1 is a schematic diagram showing the flow of the refrigerant R during an operation of returning the refrigerant R to a refrigerant circulation path 150. FIG. 1 is a schematic diagram showing the flow of refrigerant R during the first half of the first storage operation. FIG. 1 is a schematic diagram showing the flow of refrigerant R during the latter half of the first storage operation. FIG. 4 is a schematic diagram showing a storage section 460, an electrode rod 461, and a cylindrical member 462. FIG. FIG. 12B is a cross-sectional view showing cross section A in FIG. 12A.

First Embodiment
(1) Overall Configuration A refrigerant using system 1 according to a first embodiment of the present disclosure will be described. Fig. 1 is a schematic configuration diagram showing the refrigerant using system 1.

The refrigerant usage system 1 includes a first refrigeration cycle device 100A, a second refrigeration cycle device 100B, and a refrigerant amount measurement system 4. The refrigerant amount measurement system 4 measures the amount of refrigerant R in the first refrigeration cycle device 100A and the second refrigeration cycle device 100B. The first refrigeration cycle device 100A is connected to the refrigerant amount measurement system 4 by a first pipe 410 and a second pipe 420. The second refrigeration cycle device 100B is connected to the refrigerant amount measurement system 4 by a third pipe 430 and a fourth pipe 440.

The first refrigeration cycle device 100A and the control unit 140a of the refrigerant amount measurement system 4 are electrically connected. The second refrigeration cycle device 100B and the control unit 140b of the refrigerant amount measurement system 4 are electrically connected.

Figure 1 shows a state in which a refrigerant amount measurement system 4 is attached to a first refrigeration cycle device 100A and a second refrigeration cycle device 100B. Note that the number of refrigeration cycle devices 100 included in the refrigerant usage system 1 is not limited to two, and may be one, or three or more.

The first refrigeration cycle device 100A and the second refrigeration cycle device 100B have similar devices and similar functions. For this reason, in the following description common to the first refrigeration cycle device 100A and the second refrigeration cycle device 100B, they will be described as refrigeration cycle device 100. In the description where it is necessary to distinguish between the first refrigeration cycle device 100A and the second refrigeration cycle device 100B, the devices constituting each device will be distinguished by adding "A" or "B" to the reference symbols.

Control units 140a and 140b have similar devices and similar functions. For this reason, in the following description common to control units 140a and 140b, they will be described as control unit 140. In descriptions that require a distinction between control units 140a and 140b, the reference symbols of the devices that make up each unit will be differentiated by adding "a" or "b."

In the following description, the same or corresponding configurations among the embodiments and modifications will be given the same reference symbols and descriptions will be omitted as appropriate.

(2) Detailed Configuration (2-1) Refrigeration Cycle Apparatus The refrigeration cycle apparatus 100 is an air-conditioning apparatus that uses a vapor compression refrigeration cycle to cool and heat a space to be air-conditioned (not shown). The refrigeration cycle apparatus 100 has an indoor unit 110, an outdoor unit 120, a gas-side connecting pipe 131, and a liquid-side connecting pipe 132. The refrigeration cycle apparatus 100 is a multi-type air-conditioning apparatus for buildings that has two indoor units 110. The number of indoor units 110 that the refrigeration cycle apparatus 100 has is not limited to two, and may be one, or three or more.

Although details will be described later, the indoor unit 110 has an indoor refrigerant flow path 111, and the outdoor unit 120 has an outdoor refrigerant flow path 121. The indoor refrigerant flow path 111, the outdoor refrigerant flow path 121, the gas side connecting pipe 131, and the liquid side connecting pipe 132 form a refrigerant circulation path 150. The refrigerant circulation path 150 of the first refrigeration cycle device 100A is an example of a first refrigerant circuit. The refrigerant circulation path 150 of the second refrigeration cycle device 100B is an example of a second refrigerant circuit. The refrigerant circulation path 150 is filled with refrigerant R. The refrigerant R filled in the refrigerant circulation path 150 is, but is not limited to, a fluorocarbon-based refrigerant R such as R32 or R410A having a low flammability (A2L). The refrigerant R may be flammable or toxic. The refrigeration cycle device 100 is not limited to an air conditioning device, and may be, for example, a refrigerator, a freezer, a water heater, a floor heating device, etc.

(2-1-1) Indoor Unit The indoor unit 110 is installed in a space to be air-conditioned. The indoor unit 110 has an indoor refrigerant flow path 111 and a detection unit 116.

The indoor refrigerant flow path 111 constitutes part of the refrigerant circulation path 150. The indoor refrigerant flow path 111 is formed by connecting the indoor heat exchanger 112 and the indoor expansion mechanism 113 via a refrigerant piping.

The indoor heat exchanger 112 exchanges heat between the refrigerant R flowing inside the indoor heat exchanger 112 and the air in the space to be air-conditioned. The indoor heat exchanger 112 functions as an evaporator of the refrigerant during cooling operation, and as a radiator of the refrigerant R during heating operation. One end of the indoor heat exchanger 112 is connected to the gas side connection part 114 via a refrigerant piping. The other end of the indoor heat exchanger 112 is connected to the indoor expansion mechanism 113 via a refrigerant piping.

The indoor expansion mechanism 113 adjusts the pressure and flow rate of the refrigerant R flowing through the refrigerant circulation path 150. The indoor expansion mechanism 113 is an electronic expansion valve whose opening is adjusted by an actuator (not shown). The indoor expansion mechanism 113 is connected to the indoor heat exchanger 112 and the liquid side connection part 115 via the refrigerant piping. The opening of the indoor expansion mechanism 113 is controlled by the control part 140.

The gas side connection part 114 is one end of the indoor refrigerant flow path 111. The gas side connection part 114 is connected to the gas side communication pipe 131.

The liquid side connection part 115 is the other end of the indoor refrigerant flow path 111. The liquid side connection part 115 is connected to the liquid side communication pipe 132.

The detection unit 116 detects leakage of refrigerant R from the refrigerant circulation path 150. The detection unit 116 is installed inside the casing (not shown) of the indoor unit 110. The detection unit 116 may be any type as long as it can detect leakage of refrigerant R from the refrigerant circulation path 150, and may be a sensor that detects refrigerant R, or may detect leakage of refrigerant R based on a sudden change in the air temperature or piping temperature inside the casing of the indoor unit 110. When the detection unit 116 detects leakage of refrigerant R, it transmits a signal indicating leakage of refrigerant R to the control unit 140.

(2-1-2) Outdoor Unit The outdoor unit 120 is disposed outside the space to be air-conditioned. The outdoor unit 120 is installed, for example, on the roof of the building in which the refrigeration cycle apparatus 100 is installed or adjacent to the building. The outdoor unit 120 has an outdoor refrigerant flow path 121, a gas side branch pipe 128, and a liquid side branch pipe 129.

The outdoor refrigerant flow path 121 constitutes a part of the refrigerant circulation path 150. The outdoor refrigerant flow path 121 is formed by connecting the first compressor 122, the outdoor heat exchanger 123, the outdoor expansion mechanism 124, the flow path switching mechanism 125, the gas side connection part 126, and the liquid side connection part 127 via the refrigerant piping 121a. The refrigerant piping 121a includes a first refrigerant piping 121b, a second refrigerant piping 121c, and a third refrigerant piping 121d.

The first compressor 122 draws in low-pressure refrigerant R in the refrigeration cycle from the suction pipe 122a, compresses the refrigerant R using a compression mechanism (not shown), and discharges the compressed refrigerant R to the discharge pipe 122b. The operation of the first compressor 122 is controlled by the control unit 140.

The outdoor heat exchanger 123 exchanges heat between the refrigerant R flowing inside the outdoor heat exchanger 123 and the air (heat source air) in the location where the outdoor unit 120 is installed. The outdoor heat exchanger 123 functions as a radiator of the refrigerant R during cooling operation, and as an evaporator of the refrigerant R during heating operation. One end of the outdoor heat exchanger 123 is connected to the flow path switching mechanism 125 via a refrigerant piping. The other end of the outdoor heat exchanger 123 is connected to the outdoor expansion mechanism 124 via a refrigerant piping.

The outdoor expansion mechanism 124 adjusts the pressure and flow rate of the refrigerant R flowing through the refrigerant circulation path 150. The outdoor expansion mechanism 124 is an electronic expansion valve whose opening is adjusted by an actuator (not shown). The opening of the indoor expansion mechanism 113 is controlled by the control unit 140. The outdoor expansion mechanism 124 is connected to the outdoor heat exchanger 123 and the liquid side connection part 127 via a refrigerant piping.

The flow path switching mechanism 125 changes the state of the refrigerant circulation path 150 between a first state and a second state by switching the flow direction of the refrigerant R. When the refrigerant circulation path 150 is in the first state, the outdoor heat exchanger 123 functions as a radiator of the refrigerant R, and the indoor heat exchanger 112 functions as an evaporator of the refrigerant R. When the refrigerant circulation path 150 is in the second state, the outdoor heat exchanger 123 functions as an evaporator of the refrigerant R, and the indoor heat exchanger 112 functions as a radiator of the refrigerant R. The flow path switching mechanism 125 is controlled by the control unit 140. In this embodiment, the flow path switching mechanism 125 is a four-way switching valve. However, the flow path switching mechanism 125 is not limited to a four-way switching valve. For example, the flow path switching mechanism 125 may be configured by combining multiple solenoid valves and refrigerant pipes to realize switching of the flow direction of the refrigerant R as follows.

During cooling operation, the flow path switching mechanism 125 sets the state of the refrigerant circulation path 150 to a first state. In other words, during cooling operation, the flow path switching mechanism 125 connects the suction pipe 122a to the gas side connection part 126 and the discharge pipe 122b to the outdoor heat exchanger 123 (see the dashed line in the flow path switching mechanism 125 in FIG. 1). During heating operation, the flow path switching mechanism 125 sets the state of the refrigerant circulation path 150 to a second state. In other words, during heating operation, the flow path switching mechanism 125 connects the suction pipe 122a to the outdoor heat exchanger 123 and the discharge pipe 122b to the gas side connection part 126 (see the solid line in the flow path switching mechanism 125 in FIG. 1).

The gas side connection part 126 is one end of the outdoor refrigerant flow path 121. The gas side connection part 126 is connected to the gas side communication pipe 131.

The liquid side connection part 127 is the other end of the outdoor refrigerant flow path 121. The liquid side connection part 127 is connected to the liquid side communication pipe 132.

The first refrigerant pipe 121b connects the flow path switching mechanism 125 and the gas side connection part 126.

The second refrigerant pipe 121c connects the outdoor heat exchanger 123 and the outdoor expansion mechanism 124.

The third refrigerant pipe 121d connects the outdoor expansion mechanism 124 and the liquid side connection part 127.

The gas side branch pipe 128 is a pipe that connects the first refrigerant pipe 121b and the refrigerant amount measurement system 4. In this embodiment, one end of the gas side branch pipe 128 is connected to the first refrigerant pipe 121b. The other end of the gas side branch pipe 128 is connected to the first pipe 410 or the third pipe 430.

The liquid side branch pipe 129 is a pipe that connects the second refrigerant pipe 121c and the refrigerant amount measurement system 4. In this embodiment, one end of the liquid side branch pipe 129 is connected to the second refrigerant pipe 121c. The other end of the liquid side branch pipe 129 connects to the second pipe 420 or the fourth pipe 440.

(2-1-3) Gas Side Communication Pipe and Liquid Side Communication Pipe The gas side communication pipe 131 and the liquid side communication pipe 132 connect the indoor refrigerant flow path 111 and the outdoor refrigerant flow path 121 .

The gas side connection pipe 131 is connected to the gas side connection 114 of the indoor refrigerant flow path 111 and the gas side connection 126 of the outdoor refrigerant flow path 121.

The indoor refrigerant flow path 111 is connected to the liquid side connection 115 of the indoor refrigerant flow path 111 and the liquid side connection 127 of the outdoor refrigerant flow path 121.

(2-2) Refrigerant Amount Measurement System The refrigerant amount measurement system 4 is a system that stores the refrigerant R in the refrigeration cycle apparatus 100, measures the amount of the refrigerant R, and returns the refrigerant R to the refrigeration cycle apparatus 100. The refrigerant amount measurement system 4 has an on-off valve 230, a first pipe 410, a second pipe 420, a third pipe 430, a fourth pipe 440, a gas side pipe 451, a liquid side pipe 452, a storage section 460, an electrode rod 461, a calculation device 470, and a control section 140. The on-off valve 230, the first pipe 410, the second pipe 420, the third pipe 430, and the fourth pipe 440 constitute the connection section 400. The electrode rod 461 and the measurement calculation section 471 constitute the measurement section 401.

The refrigerant amount measurement system 4 is externally connected to the first refrigeration cycle device 100A via a first pipe 410 and a second pipe 420. The refrigerant amount measurement system 4 is externally connected to the second refrigeration cycle device 100B via a third pipe 430 and a fourth pipe 440. The number of refrigeration cycle devices 100 to which the refrigerant amount measurement system 4 is connected is not limited to two, and may be one, or three or more.

(2-2-1) Storage Unit The storage unit 460 is a cylindrical container that stores the refrigerant R in the refrigerant circulation path 150 by a refrigerant amount measurement operation described later. The storage unit 460 is connected to the refrigeration cycle apparatus 100 by a first pipe 410, a second pipe 420, a third pipe 430, and a fourth pipe 440 via a gas side pipe 451 and a liquid side pipe 452. The storage unit 460 is not limited to a cylindrical container, and may be a container of another shape that can store the refrigerant R.

(2-2-2) Gas Side Piping and Liquid Side Piping The gas side piping 451 is a piping for communicating the first pipe 410 and the third pipe 430 with the storage section 460. One end of the gas side piping 451 is connected to the storage section 460. The other end of the gas side piping 451 is connected to the gas side branch piping 128 via the first pipe 410 or the third pipe 430.

The liquid side piping 452 is a piping for connecting the second pipe 420 and the fourth pipe 440 to the storage section 460. One end of the liquid side piping 452 is connected to the storage section 460. The other end of the liquid side piping 452 is connected to the liquid side branch piping 129 via the second pipe 420 or the fourth pipe 440.

(2-2-3) Connection Part The connection part 400 communicates the refrigerant circulation path 150 of the refrigeration cycle apparatus 100 with the storage part 460. The connection part 400 has an on-off valve 230, a first pipe 410, a second pipe 420, a third pipe 430, and a fourth pipe 440.

(2-2-3-1) First Pipe The first pipe 410 is a pipe that connects the gas side branch pipe 128A of the first refrigeration cycle apparatus 100A to the gas side pipe 451. One end of the first pipe 410 is connected to the gas side branch pipe 128A of the first refrigeration cycle apparatus 100A. The other end of the first pipe 410 is connected to the gas side pipe 451.

(2-2-3-2) Second Pipe The second pipe 420 is a pipe that connects the liquid side branch pipe 129A of the first refrigeration cycle apparatus 100A to the liquid side pipe 452. One end of the second pipe 420 is connected to the liquid side branch pipe 129A of the first refrigeration cycle apparatus 100A. The other end of the second pipe 420 is connected to the liquid side pipe 452.

(2-2-3-3) Third Pipe The third pipe 430 is a pipe that connects the gas side branch pipe 128B of the second refrigeration cycle apparatus 100B to the gas side pipe 451. One end of the third pipe 430 is connected to the gas side branch pipe 128B of the second refrigeration cycle apparatus 100B. The other end of the third pipe 430 is connected to the gas side pipe 451.

(2-2-3-4) Fourth Pipe The fourth pipe 440 is a pipe that connects the liquid side branch pipe 129B of the second refrigeration cycle apparatus 100B to the liquid side pipe 452. One end of the fourth pipe 440 is connected to the liquid side branch pipe 129B of the second refrigeration cycle apparatus 100B. The other end of the fourth pipe 440 is connected to the liquid side pipe 452.

(2-2-3-5) On-off valves The on-off valves 230 are provided in the first pipe 410, the second pipe 420, the third pipe 430, and the fourth pipe 440. The on-off valves 230 included in the refrigerant amount measurement system 4 include on-off valves 230a, 230b, 230c, and 230d.

(2-2-3-5-1) Open/close valve 230a
The on-off valve 230a is provided in the first pipe 410. The on-off valve 230a allows or blocks communication of the first pipe 410. The on-off valve 230a is an electromagnetic on-off valve, and is controlled to be opened or closed by the control unit 140a.

(2-2-3-5-2) On-off valve 230b
The on-off valve 230b is provided in the second pipe 420. The on-off valve 230b allows or blocks communication of the second pipe 420. The on-off valve 230b is an electromagnetic on-off valve, and is controlled to open and close by the control unit 140a.

(2-2-3-5-3) On-off valve 230c
The on-off valve 230c is provided in the third pipe 430. The on-off valve 230c allows or blocks communication of the third pipe 430. The on-off valve 230c is an electromagnetic on-off valve, and is controlled to be opened or closed by the control unit 140b.

(2-2-3-5-4) On-off valve 230d
The on-off valve 230d is provided in the fourth pipe 440. The on-off valve 230d allows or blocks communication of the fourth pipe 440. The on-off valve 230d is an electromagnetic on-off valve, and is controlled to be opened or closed by the control unit 140b.

(2-2-4) Electrode Rod The electrode rod 461 is a device for measuring the amount of refrigerant R in the storage section 460. The electrode rod 461 is electrically connected to the measurement calculation section 471. The electrode rod 461 is controlled by the control section 140 via the measurement calculation section 471. The electrode rod 461 is provided so that the positional relationship between the electrode rod 461 and the storage section 460 does not change. A detailed operation related to the electrode rod 461 will be described later.

(2-2-5) Control Unit The control unit 140 controls the operation of each unit constituting the refrigeration cycle apparatus 100 and the refrigerant amount measurement system 4. The control unit 140 is electrically connected to the indoor expansion mechanism 113, the detection unit 116, the first compressor 122, the outdoor expansion mechanism 124, the flow path switching mechanism 125, the on-off valve 230, and the calculation device 470 so as to be able to exchange control signals and information with them.

Figure 2 is a control block diagram of the control unit 140. In this embodiment, the control unit 140 is installed outside the refrigeration cycle apparatus 100. The control unit 140 may also be provided inside the casing of the outdoor unit 120 or in a server separate from the refrigeration cycle apparatus 100.

The control unit 140 controls the operation of each part constituting the refrigeration cycle device 100 and the refrigerant amount measurement system 4 to perform air conditioning operation and refrigerant amount measurement operation. The air conditioning operation includes cooling operation and heating operation. The refrigerant amount measurement operation includes a first refrigerant amount measurement operation and a second refrigerant amount measurement operation. The refrigerant amount measurement operation is an operation of transferring refrigerant R from the refrigerant circulation path 150 to the storage section 460, causing the measurement section 401 to measure the amount of refrigerant R, and returning the refrigerant R from the storage section 460 to the refrigerant circulation path 150.

The first refrigeration cycle device 100A is connected to the control unit 140a. The second refrigeration cycle device 100B is connected to the control unit 140b. The control units 140a and 140b are electrically connected to each other. The control units 140a and 140b cooperate with each other to perform air conditioning operation and refrigerant amount measurement operation, so below, the control units 140a and 140b are collectively referred to as the control unit 140.

The control of the refrigeration cycle device 100 during cooling operation and heating operation will be explained. Details of the refrigerant amount measurement operation will be described later.

(Cooling operation)
When the refrigeration cycle apparatus 100 is instructed to perform cooling operation, the control unit 140 controls the flow path switching mechanism 125 to the state shown by the dashed line in Figure 1 so that the state of the refrigerant circulation path 150 becomes the first state described above, and operates the first compressor 122.

When the first compressor 122 is operated, the low-pressure gas refrigerant in the refrigeration cycle is compressed to become a high-pressure gas refrigerant in the refrigeration cycle. The high-pressure gas refrigerant is sent to the outdoor heat exchanger 123 via the flow path switching mechanism 125, where it exchanges heat with the heat source air and condenses to become a high-pressure liquid refrigerant. The high-pressure liquid refrigerant is sent to the indoor unit 110 via the fully opened indoor expansion mechanism 113 and the liquid side connection pipe 132. The gas-liquid two-phase refrigerant R sent to the indoor unit 110 is decompressed to near the suction pressure of the first compressor 122 in the indoor expansion mechanism 113 with the opening reduced, becoming a gas-liquid two-phase refrigerant R and being sent to the indoor heat exchanger 112. The gas-liquid two-phase refrigerant R exchanges heat with the air in the space to be air-conditioned in the indoor heat exchanger 112, evaporating to become a low-pressure gas refrigerant. The low-pressure gas refrigerant is sent to the outdoor unit 120 via the gas side connection pipe 131, and is sucked into the first compressor 122 again via the flow path switching mechanism 125. The air supplied to the indoor heat exchanger 112 is cooled by heat exchange with the refrigerant R flowing through the indoor heat exchanger 112. The air cooled by the indoor heat exchanger 112 is blown out into the space to be air-conditioned.

(Heating operation)
When the refrigeration cycle apparatus 100 is instructed to perform heating operation, the control unit 140 controls the flow path switching mechanism 125 to the state shown by the solid line in Figure 1 so that the state of the refrigerant circulation path 150 becomes the second state described above, and operates the first compressor 122.

When the first compressor 122 is operated, the low-pressure gas refrigerant in the refrigeration cycle is compressed to become high-pressure gas refrigerant in the refrigeration cycle. The high-pressure gas refrigerant is sent to the indoor unit 110 via the flow path switching mechanism 125 and the gas side connecting pipe 131. The refrigerant R sent to the indoor unit 110 is sent to the indoor heat exchanger 112, where it exchanges heat with the air in the space to be air-conditioned and condenses to become high-pressure liquid refrigerant. The air supplied to the indoor heat exchanger 112 is heated by exchanging heat with the refrigerant R flowing through the indoor heat exchanger 112, and the temperature increases. The air heated by the indoor heat exchanger 112 is blown out into the space to be air-conditioned. The high-pressure liquid refrigerant flowing out of the indoor heat exchanger 112 is sent to the outdoor unit 120 via the fully opened indoor expansion mechanism 113 and the liquid side connecting pipe 132. The refrigerant R sent to the outdoor unit 120 is decompressed to near the suction pressure of the first compressor 122 in the outdoor expansion mechanism 124, which has a reduced opening, and becomes refrigerant R in a gas-liquid two-phase state, and is sent to the outdoor heat exchanger 123. The refrigerant R in the gas-liquid two-phase state exchanges heat with the heat source air in the outdoor heat exchanger 123, evaporating and becoming a low-pressure gas refrigerant. The low-pressure gas refrigerant is sucked back into the first compressor 122 via the flow path switching mechanism 125.

The control unit 140 is realized by a computer. The control unit 140 includes a control arithmetic unit and a storage device (both not shown). A processor such as a CPU or a GPU can be used for the control arithmetic unit. The control arithmetic unit reads out a program stored in the storage device, and performs predetermined image processing and arithmetic processing according to the program. Furthermore, the control arithmetic unit can write the results of calculations to the storage device and read out information stored in the storage device according to the program. The storage device can be used as a database. The specific functions realized by the control unit 140 will be described later.

Note that the configuration of the control unit 140 described here is merely an example, and the functions of the control unit 140 described below may be realized by software, hardware, or a combination of software and hardware.

(2-2-6) Calculation Device The calculation device 470 is a device that performs calculations related to the measurement of the amount of refrigerant R in the storage unit 460, and records and stores the measurement results in the memory unit 472. FIG. 3 is a control block diagram of the calculation device 470. The calculation device 470 has a measurement calculation unit 471 and a memory unit 472. The calculation device 470 is electrically connected to the electrode rod 461 and the control unit 140. The calculation device 470 is controlled by the control unit 140.

The calculation device 470 may be provided near the location where the storage unit 460 is provided, in a building where the refrigeration cycle device 100 or the storage unit 460 is provided, or in a server away from the refrigeration cycle device 100. The measurement calculation unit 471 and the memory unit 472 may be provided in different locations.

The arithmetic device 470 is realized by a computer. The arithmetic device 470 includes a control arithmetic device and a storage device (both not shown). A processor such as a CPU or a GPU can be used for the control arithmetic device. The control arithmetic device reads a program stored in the storage device, and performs predetermined image processing and arithmetic processing according to the program. Furthermore, the control arithmetic device can write the results of calculations to the storage device and read information stored in the storage device according to the program. The storage device can be used as a database.

Note that the configuration of the arithmetic unit 470 described here is merely an example, and the functions of the arithmetic unit 470 described below may be realized in software, in hardware, or in a combination of software and hardware.

(2-2-6-1) Measurement and Calculation Unit The measurement and calculation unit 471 performs calculations related to the measurement of the amount of refrigerant R in the storage unit 460, and records the measurement results in the memory unit 472. The measurement and calculation unit 471 is electrically connected to the electrode rod 461 and the control unit 140. The measurement and calculation unit 471 is controlled by the control unit 140. The detailed operation of the measurement and calculation unit 471 will be described later.

(2-2-6-2) Storage Unit Storage unit 472 is a storage device that stores the measurement results of the amount of refrigerant R in storage unit 460. Storage unit 472 is electrically connected to measurement calculation unit 471 and control unit 140. Storage unit 472 is controlled by control unit 140.

(3) Operation The refrigerant amount measuring operation executed by the control unit 140 of the refrigerant amount measuring system 4 will be described.

(3-1) Refrigerant Amount Measurement Operation The refrigerant amount measurement operation is an operation for transferring refrigerant R from refrigerant circulation path 150 to storage section 460, causing measurement section 401 to measure the amount of refrigerant R, and returning refrigerant R from storage section 460 to refrigerant circulation path 150. The refrigerant amount measurement operation is an operation for measuring the amount of refrigerant charged in the refrigeration cycle apparatus at each time point from the start of use of the refrigeration cycle apparatus to its disposal, and for clarifying the refrigerant charge amount at the start of use, the refrigerant charge amount after the start of use, the refrigerant charge amount immediately before disposal, and the leakage amount of refrigerant R from the difference between the refrigerant charge amount at the start of use and each time point. The refrigerant amount measurement operation includes a first refrigerant amount measurement operation and a second refrigerant amount measurement operation.

(3-1-1) First refrigerant amount measurement operation The first refrigerant amount measurement operation is an operation of transferring refrigerant R from refrigerant circulation path 150 of first refrigeration cycle apparatus 100A to storage section 460, causing measurement section 401 to measure the amount of refrigerant R, and returning refrigerant R from storage section 460 to refrigerant circulation path 150 of first refrigeration cycle apparatus 100A. The first refrigerant amount measurement operation will be described separately into an operation of transferring refrigerant R to storage section 460, an operation of causing measurement section 401 to measure the amount of refrigerant R, and an operation of returning refrigerant R to refrigerant circulation path 150.

(3-1-1-1) Operation of transferring refrigerant to the storage section (first half of operation)
The first half of the operation of transferring the refrigerant R to the storage section 460 is an operation of storing mainly liquid refrigerant within the refrigerant circulation path 150. Fig. 4 is a schematic diagram showing the flow of the refrigerant R in the first half of the operation of transferring the refrigerant R to the storage section 460.

In the first half of the operation of transferring the refrigerant R to the storage section 460, the control section 140a opens the indoor expansion mechanism 113A for all indoor units 110A. In addition, for the outdoor unit 120A, the control section 140a closes the outdoor expansion mechanism 124A of the first refrigeration cycle device 100A, sets the flow path switching mechanism 125A to the first state, and operates the first compressor 122 (On). Furthermore, for the refrigerant amount measurement system 4, the control section 140a opens the on-off valve 230b and closes the on-off valves 230 other than the on-off valve 230b. Specifically, the control section 140a closes the on-off valves 230a, 230c, and 230d.

By executing the first half of the operation of transferring the refrigerant R to the storage section 460, the refrigerant R in the indoor refrigerant flow path 111A is sucked by the first compressor 122A of the outdoor unit 120A, as shown by the arrow in FIG. 4. The refrigerant R sucked into the first compressor 122A passes through the flow path switching mechanism 125A and the outdoor heat exchanger 123A after being discharged from the first compressor 122A. The refrigerant R that passes through the outdoor heat exchanger 123A is sent to the outdoor expansion mechanism 124A, but since the outdoor expansion mechanism 124A is in a closed state, it flows into the liquid side branch pipe 129A. The refrigerant R that flows into the liquid side branch pipe 129A passes through the second pipe 420 and the liquid side pipe 452 and flows into the storage section 460. Since the on-off valves 230 other than the on-off valve 230b of the refrigerant amount measurement system 4 are in a closed state, the refrigerant R that flows in is stored in the storage section 460.

When the control unit 140a executes the first half of the operation of transferring the refrigerant R to the storage unit 460 for a preset predetermined time T1, the control unit 140a ends the first half of the operation of transferring the refrigerant R to the storage unit 460 and starts the second half of the operation of transferring the refrigerant R to the storage unit 460. The predetermined time T1 is set, for example, to a length that allows the liquid refrigerant in the refrigerant circulation path 150A to be stored in the storage unit 460.

(Second half of the operation)
The latter half of the operation of transferring refrigerant R to storage section 460 is an operation for storing in storage section 460 mainly gas refrigerant that cannot be stored in storage section 460 even by performing the first half of the operation of transferring refrigerant R to storage section 460 and remains in outdoor refrigerant flow path 121. Fig. 5 is a schematic diagram showing the flow of refrigerant R in the latter half of the operation of transferring refrigerant R to storage section 460.

In the latter half of the operation of transferring the refrigerant R to the storage section 460, the control section 140a opens the on-off valve 230a for the storage section 460. For the other devices, the state of the first half of the operation of transferring the refrigerant R to the storage section 460 is maintained.

By performing the latter half of the operation of transferring the refrigerant R to the storage section 460, as shown by the arrow in FIG. 5, the gas refrigerant of the refrigerant R stored in the storage section 460 flows into the first tube 410 through the on-off valve 230a. The refrigerant R that flows into the first tube 410 is sent to the outdoor refrigerant flow path 121A, passes through the flow path switching mechanism 125A, and is sucked into the first compressor 122A. The refrigerant R that is sucked into the first compressor 122A is discharged from the first compressor 122A and passes through the outdoor heat exchanger 123A. The refrigerant R that passes through the outdoor heat exchanger 123A is sent to the outdoor expansion mechanism 124A, but since the outdoor expansion mechanism 124A is in a closed state, it flows into the liquid side branch pipe 129A. The refrigerant R that flows into the liquid side branch pipe 129A passes through the second tube 420 and returns to the storage section 460.

When the control unit 140a executes the latter half of the operation of transferring the refrigerant R to the storage unit 460 for a preset predetermined time T2, the control unit 140a ends the latter half of the operation of transferring the refrigerant R to the storage unit 460. The predetermined time T2 is set, for example, to a length that allows the refrigerant R remaining in the refrigerant circulation path 150A to be collected in the storage unit 460 after the execution of the first half of the operation of transferring the refrigerant R to the storage unit 460.

(3-1-1-2) Operation of having measuring unit 401 measure the amount of refrigerant The operation of having measuring unit 401 measure the amount of refrigerant R is an operation of having measuring unit 401 measure the amount of refrigerant R stored in storage unit 460. When a preset predetermined time T3 has elapsed from the time when the latter half of the operation of transferring refrigerant R to storage unit 460 is completed, control unit 140a executes the operation of having measuring unit 401 measure the amount of refrigerant R.

(Measurement principle)
6 is a schematic diagram showing a storage section 460 in which refrigerant R is stored and an electrode rod 461. The capacitance C is determined by the distance X between the electrode rod 461 and the storage section 460, the dielectric constants ε of air and refrigerant R, and the electrode area S.

The positional relationship between the electrode rod 461 and the storage section 460 does not change. Therefore, the distance X between the electrode rod 461 and the storage section 460 is a fixed value.

When the temperature is constant, the dielectric constant ε of air and refrigerant R are also fixed values. For example, when the temperature is 0 degrees, the dielectric constant ε of air is 1.00059. When the temperature is 25 degrees and the refrigerant R is R32, the dielectric constant ε is 14.27. When the temperature is 25 degrees and the refrigerant R is R410A, the dielectric constant ε is 7.88.

Therefore, the capacitance C varies depending on the electrode area S. The width d of the cylindrical storage section 460 is a fixed value. Therefore, the electrode area S is proportional to the liquid level h of the refrigerant R.

Figure 7 shows the relationship between the capacitance C and the liquid level h of the refrigerant R as a function of temperature. The dielectric constant ε of the refrigerant R decreases at higher temperatures and increases at lower temperatures.

Therefore, by measuring the capacitance C and the temperature of the refrigerant R and using other characteristic values, the liquid level h of the refrigerant R can be calculated, and the amount of refrigerant can be calculated.

(Measurement Operation)
The storage unit 472 stores in advance the distance X, the width d, the dielectric constant ε of the air and the refrigerant R associated with the temperature, and the like.

When the operation of having the measurement unit 401 measure the amount of refrigerant R is executed, the control unit 140a causes the electrode rod 461 to measure the capacitance C in the storage unit 460 via the measurement calculation unit 471. The control unit 140a also causes a thermometer (not shown) to measure the temperature of the refrigerant R. The measurement calculation unit 471 compares the measured temperature of the refrigerant R with the dielectric constant ε of the air and the refrigerant R associated with the temperature recorded in the memory unit 472 to obtain the dielectric constant ε of the air and the refrigerant R. The measurement calculation unit 471 obtains the liquid level height h of the refrigerant R and the amount of the refrigerant R based on the measured capacitance C, the distance X and width d recorded in the memory unit 472, and the obtained dielectric constant ε of the air and the refrigerant R. The measurement calculation unit 471 records the obtained amount of the refrigerant R in the memory unit 472. The measurement calculation unit 471 may transmit the obtained amount of the refrigerant R to the control unit 140a.

The measurement calculation unit 471 may calculate the dielectric constant ε of air as 1, regardless of changes in temperature.

The refrigerant amount measurement system 4 measures the amount of refrigerant R based on the temperature of refrigerant R measured by the thermometer. Therefore, the refrigerant amount measurement system 4 can accurately determine the amount of refrigerant R even if the temperature changes.

The measurement calculation unit 471 may perform calculation processing to determine the difference between the measured refrigerant amount and the refrigerant charge amount at the start of use. In this case, the refrigerant charge amount at the start of use is recorded in advance in the memory unit 472. The measurement calculation unit 471 performs calculation processing using the refrigerant charge amount at the start of use stored in the memory unit 472 and the measured refrigerant amount. This allows the refrigerant amount measurement system 4 to reduce the burden of the work of clarifying the amount of leakage of refrigerant R.

The measurement calculation unit 471 may also determine whether or not refrigerant R has leaked based on the refrigerant fill amount at the start of use, the refrigerant fill amount after the start of use, the refrigerant fill amount immediately before disposal, and the difference between the measured refrigerant amount and the refrigerant fill amount at the start of use. In this case, at least one of the refrigerant fill amounts at the start of use, the refrigerant fill amount after the start of use, and the refrigerant fill amount immediately before disposal is recorded in advance in the memory unit 472. The measurement calculation unit 471 determines whether or not refrigerant R has leaked based on at least one of the refrigerant fill amounts at the start of use, the refrigerant fill amount after the start of use, and the refrigerant fill amount immediately before disposal stored in the memory unit 472, and the difference between the measured refrigerant amount and the refrigerant fill amount at the start of use. This allows the refrigerant amount measurement system 4 to reduce the burden of the work of clarifying the amount of leakage of refrigerant R.

Furthermore, when the measurement calculation unit 471 determines that refrigerant R has leaked, it may perform a calculation process to determine the amount of leaked refrigerant R based on the refrigerant fill amount at the start of use, the refrigerant fill amount after use has started, the refrigerant fill amount immediately before disposal, and the difference between the measured refrigerant amount and the refrigerant fill amount at the start of use. This allows the refrigerant amount measurement system 4 to reduce the burden of the work of clarifying the amount of leaked refrigerant R.

(3-1-1-3) Operation of Returning Refrigerant to Refrigerant Circulation Path 150 The operation of returning refrigerant R to refrigerant circulation path 150 is an operation of filling the refrigerant R stored in the storage section 460 into the refrigerant circulation path 150. In the following description, an example will be described in which the refrigerant R is returned to the first refrigeration cycle device 100A. FIG. 8 is a schematic diagram showing the flow of refrigerant R in the operation of returning refrigerant R to the refrigerant circulation path 150.

In the operation of returning the refrigerant R to the refrigerant circulation path 150, the control unit 140a opens the outdoor expansion mechanism 124A of the first refrigeration cycle device 100A for the outdoor unit 120A, sets the flow path switching mechanism 125A to the first state, and operates the first compressor 122A (On). In addition, the control unit 140a opens the on-off valve 230a and closes the on-off valves 230b, 230c, and 230d.

When the operation of returning the refrigerant R to the refrigerant circulation path 150 is performed, the suction pressure of the first compressor 122A of the outdoor unit 120A acts on the storage section 460 via the flow path switching mechanism 125, the gas side branch pipe 128A, and the first pipe 410, as shown by the arrow in FIG. 8. The suction pressure acting on the storage section 460 causes the refrigerant R in the storage section 460 to flow into the first pipe 410 and fill the refrigerant circulation path 150 via the gas side branch pipe 128A.

When the control unit 140a executes the operation of returning the refrigerant R to the refrigerant circulation path 150 for a preset predetermined time T4, the control unit 140a ends the operation of returning the refrigerant R to the refrigerant circulation path 150. The predetermined time T4 is set, for example, to a length that allows the refrigerant R stored in the storage unit 460 to be filled into the refrigerant circulation path 150.

(3-1-2) Second refrigerant amount measurement operation The second refrigerant amount measurement operation is an operation of transferring refrigerant R from the refrigerant circulation path 150 of the second refrigeration cycle apparatus 100B to the storage section 460, causing the measurement section 401 to measure the amount of refrigerant R, and returning the refrigerant R from the storage section 460 to the refrigerant circulation path 150 of the second refrigeration cycle apparatus 100B. The second refrigerant amount measurement operation is similar to the first refrigerant amount measurement operation. Therefore, the second refrigerant amount measurement operation will be briefly described.

(3-1-2-1) Operation of transferring refrigerant to the storage section (first half of operation)
In the first half of the operation of transferring the refrigerant R to the storage section 460, the control section 140b opens the indoor expansion mechanism 113B for all indoor units 110B. In addition, the control section 140b closes the outdoor expansion mechanism 124B of the second refrigeration cycle device 100B for the outdoor unit 120B, sets the flow path switching mechanism 125B to the first state, and operates the first compressor 122 (On). Furthermore, the control section 140b opens the on-off valve 230d and closes the on-off valves 230 other than the on-off valve 230d. Specifically, the control section 140b closes the on-off valves 230a, 230b, and 230c.

By executing the first half of the operation of transferring the refrigerant R to the storage section 460, the refrigerant R in the indoor refrigerant flow path 111B is sucked by the first compressor 122B of the outdoor unit 120B. After being discharged from the first compressor 122B, the refrigerant R passes through the flow path switching mechanism 125B and the outdoor heat exchanger 123B. The refrigerant R that passes through the outdoor heat exchanger 123B is sent to the outdoor expansion mechanism 124B, but since the outdoor expansion mechanism 124B is in a closed state, it flows into the liquid side branch pipe 129B. The refrigerant R that flows into the liquid side branch pipe 129B passes through the fourth pipe 440 and the liquid side pipe 452 and flows into the storage section 460. Since the on-off valves 230 other than the on-off valve 230d of the refrigerant amount measurement system 4 are in a closed state, the refrigerant R that flows in is stored in the storage section 460.

When the control unit 140d executes the first half of the operation of transferring the refrigerant R to the storage unit 460 for a preset predetermined time T1, the control unit 140d ends the first half of the operation of transferring the refrigerant R to the storage unit 460 and starts the second half of the operation of transferring the refrigerant R to the storage unit 460. The predetermined time T1 is set, for example, to a length that allows the liquid refrigerant in the refrigerant circulation path 150B to be stored in the storage unit 460.

(Second half of the operation)
In the latter half of the operation of transferring the refrigerant R to the storage portion 460, the control portion 140d opens the on-off valve 230c. For the other devices, the states in the first half of the operation of transferring the refrigerant R to the storage portion 460 are maintained.

By performing the latter half of the operation of transferring the refrigerant R to the storage section 460, the gas refrigerant of the refrigerant R stored in the storage section 460 flows into the third tube 430 through the on-off valve 230c. The refrigerant R that flows into the third tube 430 is sent to the outdoor refrigerant flow path 121B, passes through the flow path switching mechanism 125B, and is sucked into the first compressor 122B. The refrigerant R that is sucked into the first compressor 122B is discharged from the first compressor 122B and passes through the outdoor heat exchanger 123B. The refrigerant R that passes through the outdoor heat exchanger 123B is sent to the outdoor expansion mechanism 124B, but since the outdoor expansion mechanism 124B is in a closed state, it flows into the liquid side branch pipe 129B. The refrigerant R that flows into the liquid side branch pipe 129B passes through the fourth tube 440 and returns to the storage section 460.

When the control unit 140b executes the latter half of the operation of transferring the refrigerant R to the storage unit 460 for a preset predetermined time T2, the control unit 140b ends the latter half of the operation of transferring the refrigerant R to the storage unit 460. The predetermined time T2 is set, for example, to a length that allows the refrigerant remaining in the refrigerant circulation path 150B to be collected in the storage unit 460 after the latter half of the operation of transferring the refrigerant R to the storage unit 460 is executed.

(3-1-2-2) Operation of having the measuring unit 401 measure the amount of refrigerant The operation of having the measuring unit 401 measure the amount of refrigerant in the second refrigerant amount measurement operation is similar to the operation of having the measuring unit 401 measure the amount of refrigerant in the first refrigerant amount measurement operation.

(3-1-2-3) Operation of Returning Refrigerant to the Refrigerant Circulation Path 150 In the operation of returning the refrigerant R to the refrigerant circulation path 150, the control unit 140b opens the outdoor expansion mechanism 124B of the second refrigeration cycle device 100B for the outdoor unit 120B, sets the flow path switching mechanism 125B to the first state, and operates the first compressor 122B (On). In addition, the control unit 140b opens the on-off valve 230c, and closes the on-off valves 230a, 230b, and 230d.

When the operation of returning the refrigerant R to the refrigerant circulation path 150 is performed, the suction pressure of the first compressor 122B of the outdoor unit 120B acts on the storage section 460 via the flow path switching mechanism 125, the gas side branch pipe 128B, and the third pipe 430. The suction pressure acting on the storage section 460 causes the refrigerant R in the storage section 460 to flow into the third pipe 430 and fill the refrigerant circulation path 150 via the gas side branch pipe 128B.

When the control unit 140b has performed the operation of returning the refrigerant R to the refrigerant circulation path 150 for a preset predetermined time T4, the control unit 140b ends the operation of returning the refrigerant R to the refrigerant circulation path 150. The predetermined time T4 is set, for example, to a length that allows the refrigerant R stored in the storage unit 460 to be filled into the refrigerant circulation path 150.

(4) Features (4-1)
The refrigerant amount measurement system 4 includes a connection unit 400, a storage unit 460, a measurement unit 401, and a memory unit 472. The connection unit 400 is connected to the first refrigerant circuit of the first refrigeration cycle device 100A. The storage unit 460 stores the refrigerant R in the first refrigerant circuit via the connection unit 400, and returns the stored refrigerant R to the first refrigerant circuit via the connection unit 400. The measurement unit 401 measures the amount of refrigerant R in the storage unit 460. The memory unit 472 stores the measurement results measured by the measurement unit 401.

The refrigeration system of Patent Document 1 detects a refrigerant shortage state by using a receiver tank that is internally connected to the refrigerant circuit. The refrigerant flows to the receiver tank built into the system even during normal operation (such as air conditioning operation). Therefore, the refrigeration system of Patent Document 1 requires an amount of refrigerant corresponding to the volume of the receiver tank in addition to the amount of refrigerant corresponding to the existing refrigerant circuit. Furthermore, the refrigeration system of Patent Document 1 causes a pressure loss of the refrigerant when it passes through the receiver tank.

The refrigerant amount measurement system 4 stores the refrigerant R in the first refrigerant circuit in a storage section 460 that is externally connected to the first refrigerant circuit. The refrigerant amount measurement system 4 measures the amount of refrigerant R and stores the measurement results. The refrigerant amount measurement system 4 returns the stored refrigerant R from the storage section 460 that is externally connected to the first refrigerant circuit to the first refrigerant circuit. Because the storage section 460 is externally connected, when the first refrigeration cycle device 100A is operating normally, the refrigerant R in the first refrigerant circuit does not flow to the storage section 460. Therefore, the refrigerant amount measurement system can clarify the refrigerant filling amount and leakage amount of the first refrigerant circuit without causing additional refrigerant amount or pressure loss.

The refrigeration device of Patent Document 1 measures the difference in liquid level height using a liquid level detection unit. A user of this refrigeration device can grasp the difference in liquid level height between points in time when the liquid level detection unit is used, and can grasp a refrigerant shortage (refrigerant leakage). However, it is difficult for a user of this refrigeration device to grasp the actual filling amount (initial filling amount, filling amount at any point in time, etc.). As a result, a user of this refrigeration device cannot associate the filling amount with the point in time to grasp the details of the process related to filling and leakage.

The refrigerant amount measurement system 4 can measure the amount of refrigerant filled at any point in time. A user of the refrigerant amount measurement system 4 can not only determine whether or not refrigerant R has leaked, but can also correlate the amount of refrigerant filled with any point in time. A user of the refrigerant amount measurement system 4 can understand in detail the circumstances surrounding the filling and leakage. Therefore, the refrigerant amount measurement system 4 can more clearly clarify the amount of refrigerant R filled and the amount of leakage in the first refrigerant circuit.

Manually recording the filling amount measurement results increases the workload and there is a risk of measurement results being missed due to human error or the measurement results being lost due to deterioration of the recording medium over time. This refrigerant amount measurement system 4 stores the measurement results measured by the measurement unit 401 in the memory unit 472. The user of this refrigerant amount measurement system 4 can grasp the filling amount measurement results without any omissions, and the workload of storing the measurement results can be reduced. Therefore, the refrigerant amount measurement system 4 can more clearly clarify the filling amount and leakage amount of refrigerant R in the first refrigerant circuit, and can reduce the workload of storing the measurement results.

(4-2)
In the refrigerant amount measurement system 4, the connection part 400 has a first pipe 410 and a second pipe 420. Furthermore, the first pipe 410 and the second pipe 420 are each provided with an on-off valve 230.

The connection section 400 of the refrigerant amount measurement system 4 has a first tube 410 and a second tube 420. Therefore, the refrigerant amount measurement system 4 can be divided into the first tube 410 and the second tube 420 according to the state of the refrigerant R and connected to the first refrigerant circuit. In addition, an on-off valve 230 is provided in each of the first tube 410 and the second tube 420. Therefore, the refrigerant amount measurement system 4 can allow or block communication between the first tube 410 and the second tube 420.

(4-3)
The refrigerant amount measurement system 4 further includes a control unit 140. The control unit 140 performs a first refrigerant amount measurement operation. The first refrigerant amount measurement operation is an operation of controlling the first refrigeration cycle device 100A and the on-off valve 230 to transfer the refrigerant R from the first refrigerant circuit to the storage unit 460, causing the measurement unit 401 to measure the amount of the refrigerant R, and causing the refrigerant R to return from the storage unit 460 to the first refrigerant circuit.

The control unit 140 of the refrigerant amount measurement system 4 performs a first refrigerant amount measurement operation. Therefore, the refrigerant amount measurement system 4 can reduce the effort required to clarify the amount of refrigerant R filled and the amount of leakage in the first refrigerant circuit.

The refrigerant amount measurement system 4 can automatically measure the filling amount by the control unit 140. The refrigerant amount measurement system 4 stores the automatically measured filling amount in the memory unit 472. A user of the refrigerant amount measurement system 4 can know the filling amount that was automatically measured at a past point in time by the memory unit 472. Therefore, a user of the refrigerant amount measurement system 4 can associate the filling amount with a past point in time and understand the details of the process related to filling and leakage in more detail. Therefore, the refrigerant amount measurement system 4 can more clearly clarify the filling amount and leakage amount of refrigerant R in the first refrigerant circuit.

(4-4)
In the refrigerant amount measurement system 4, the connection part 400 is also connected to the second refrigerant circuit of the second refrigeration cycle apparatus 100B. The control unit 140 further has a third tube 430 and a fourth tube 440 each provided with an on-off valve 230. The connection part 400 is further connected to the first refrigerant circuit by a first tube 410 and a second tube 420, and is connected to the second refrigerant circuit by the third tube 430 and the fourth tube 440.

The connection part 400 of the refrigerant amount measurement system 4 is also connected to the second refrigerant circuit of the second refrigeration cycle device 100B. Therefore, the refrigerant amount measurement system 4 can clarify the filling amount and leakage amount of the refrigerant R in the second refrigerant circuit. The connection part 400 of the refrigerant amount measurement system 4 has a third tube 430 and a fourth tube 440. Therefore, the refrigerant amount measurement system 4 can be divided into the third tube 430 and the fourth tube 440 according to the state of the refrigerant R and connected to the second refrigerant circuit. In addition, an opening/closing valve 230 is provided in each of the third tube 430 and the fourth tube 440. Therefore, the refrigerant amount measurement system 4 can allow or block communication between the third tube 430 and the fourth tube 440.

(4-5)
In the refrigerant amount measurement system 4, the control unit 140 further performs a second refrigerant amount measurement operation. The second refrigerant amount measurement operation is an operation of controlling the second refrigeration cycle device 100B and the on-off valve 230 to transfer the refrigerant R from the second refrigerant circuit to the storage unit 460, causing the measurement unit 401 to measure the amount of the refrigerant R, and causing the refrigerant R to return from the storage unit 460 to the second refrigerant circuit.

The control unit 140 of the refrigerant amount measurement system 4 further performs a second refrigerant amount measurement operation. Therefore, the refrigerant amount measurement system 4 can also reduce the effort required to clarify the amount of refrigerant R filled and the amount of leakage in the second refrigerant circuit.

(4-6)
In the refrigerant amount measurement system 4 , the measurement unit 401 has an electrode rod 461 .

The measurement unit 401 of the refrigerant amount measurement system 4 has an electrode rod 461. Therefore, the refrigerant amount measurement system 4 can use the electrode rod 461 to more clearly determine the amount of refrigerant R filled and the amount of leakage.

(4-7)
The refrigerant using system 1 has a refrigerant amount measuring system 4 and a refrigeration cycle device 100.

This refrigerant usage system 1 has a refrigerant amount measurement system 4 and a refrigeration cycle device 100. Therefore, this refrigerant usage system 1 can clarify the amount of refrigerant R filled and the amount of leakage in the refrigeration cycle device 100 included in this refrigerant usage system 1.

(5) Modifications (5-1) Modification 1A
In the refrigerant amount measurement operation of the embodiment described above, the refrigerant R is returned to the refrigerant circulation path 150 by the suction pressure. However, the operation of returning the refrigerant R to the refrigerant circulation path 150 is not limited to this. For example, an operation of returning the refrigerant R to the refrigerant circulation path 150 of the first refrigeration cycle device 100A will be described. Fig. 9 is a schematic diagram showing the flow of the refrigerant R in the operation of returning the refrigerant R to the refrigerant circulation path 150.

In the operation of returning the refrigerant R to the refrigerant circulation path 150, the control unit 140a opens the outdoor expansion mechanism 124A of the first refrigeration cycle device 100A for the outdoor unit 120A, sets the flow path switching mechanism 125A to the second state, and operates the first compressor 122A (On). In addition, the control unit 140a opens the on-off valves 230a and 230b, and closes the on-off valves 230c and 230d.

When the operation of returning the refrigerant R to the refrigerant circulation path 150 is performed, the discharge pressure of the first compressor 122A of the outdoor unit 120A acts on the storage section 460 via the flow path switching mechanism 125, the gas side branch pipe 128A, and the first pipe 410, as shown by the arrow in FIG. 9. The discharge pressure acting on the storage section 460 causes the refrigerant R in the storage section 460 to bypass the check valve 455 and flow into the second pipe 420, and fills the refrigerant circulation path 150 via the liquid side branch pipe 129.

The operation of returning the refrigerant R to the refrigerant circulation path 150 of the second refrigeration cycle device 100B may also be performed in the same manner as described above.

(5-2) Modification 1B
The control unit 140 may perform the first refrigerant amount measurement operation and the second refrigerant amount measurement operation at different times. The control unit 140a and the control unit 140b are electrically connected to each other and cooperate with each other, so that the control unit 140a and the control unit 140b can perform the first refrigerant amount measurement operation and the second refrigerant amount measurement operation at different times.

The control unit 140 of the refrigerant amount measurement system 4 in this embodiment performs the first refrigerant amount measurement operation and the second refrigerant amount measurement operation at different times. Therefore, the refrigerant amount measurement system 4 can clearly distinguish the amount of refrigerant R filled and leaked in the first refrigerant circuit from the amount of refrigerant R filled and leaked in the second refrigerant circuit.

(5-3) Modification 1C
The control unit 140 may perform the first refrigerant amount measurement operation during a time period when the normal operation of the first refrigeration cycle apparatus 100A is stopped. The control unit 140 may perform the second refrigerant amount measurement operation during a time period when the normal operation of the second refrigeration cycle apparatus 100B is stopped. Examples of the normal operation include cooling operation, heating operation, hot water supply operation, refrigeration operation, freezing operation, and floor heating operation.

The control unit 140 of the refrigerant amount measurement system 4 according to this embodiment performs a first refrigerant amount measurement operation during a time period when the normal operation of the first refrigeration cycle device 100A is stopped. Therefore, the refrigerant amount measurement system 4 is not affected by the normal operation of the first refrigeration cycle device 100A, and can more clearly indicate the amount of refrigerant R filled and the amount of leakage in the first refrigerant circuit. The control unit 140 also performs a second refrigerant amount measurement operation during a time period when the normal operation of the second refrigeration cycle device 100B is stopped. Therefore, the refrigerant amount measurement system 4 is not affected by the normal operation of the second refrigeration cycle device 100B, and can more clearly indicate the amount of refrigerant R filled and the amount of leakage in the second refrigerant circuit.

(5-4) Modification 1D
The on-off valve 230 in the above-described embodiment is controlled by the control unit 140 and automatically allows or blocks communication between the pipes. However, in addition to or instead of the above-described embodiment, the on-off valve 230 may manually allow or block communication between the pipes.

By manually allowing or blocking the communication of the pipes with the on-off valve 230, the communication of the pipes can be allowed or blocked even in situations where control by the control unit 140 is difficult.

Second Embodiment
(1) Configuration A refrigerant using system 1 according to a second embodiment of the present disclosure will be described, focusing on the differences from the refrigerant using system 1 according to the first embodiment.

The control unit 140 of the refrigerant usage system 1 according to the second embodiment performs a storage operation in addition to the operations performed by the control unit 140 of the refrigerant usage system 1 according to the first embodiment.

(2) Operation (2-1) Storage Operation The storage operation is an operation of transferring refrigerant R from refrigerant circulation path 150 to storage section 460 when refrigerant R leaks from refrigerant circulation path 150. The storage operation is performed, for example, to suppress further leakage of refrigerant R when refrigerant R leaks from refrigerant circulation path 150. The storage operation includes a first storage operation and a second storage operation.

(2-1-1) First Storing Operation The first storing operation is an operation for transferring the refrigerant R from the refrigerant circulation path 150 to the storage section 460 when the refrigerant R leaks from the refrigerant circulation path 150 of the first refrigeration cycle device 100A. The first storing operation includes a first half operation and a second half operation.

(First half of the action)
The first half of the first storage operation is an operation for storing mainly liquid refrigerant of the refrigerant R in the refrigerant circulation path 150. Fig. 10 is a schematic diagram showing the flow of the refrigerant R in the first half of the first storage operation.

In the first half of the first storage operation, the control unit 140a opens the indoor expansion mechanisms 113A for all indoor units 110A. In addition, for the outdoor unit 120A, the control unit 140a closes the outdoor expansion mechanism 124A of the first refrigeration cycle device 100A, sets the flow path switching mechanism 125A to the first state, and operates the first compressor 122 (On). Furthermore, for the refrigerant amount measurement system 4, the control unit 140a opens the on-off valve 230b and closes the on-off valves 230 other than the on-off valve 230b. Specifically, the control unit 140a closes the on-off valves 230a, 230c, and 230d.

By executing the first half of the first storage operation, the refrigerant R in the indoor refrigerant flow path 111A is sucked in by the first compressor 122A of the outdoor unit 120A, as shown by the arrow in FIG. 10. The refrigerant R sucked into the first compressor 122A passes through the flow path switching mechanism 125A and the outdoor heat exchanger 123A after being discharged from the first compressor 122A. The refrigerant R that passes through the outdoor heat exchanger 123A is sent to the outdoor expansion mechanism 124A, but since the outdoor expansion mechanism 124A is in a closed state, it flows into the liquid side branch pipe 129A. The refrigerant R that flows into the liquid side branch pipe 129A passes through the second pipe 420 and the liquid side pipe 452 and flows into the storage section 460. Since the on-off valves 230 other than the on-off valve 230b of the refrigerant amount measurement system 4 are in a closed state, the refrigerant R that flows in is stored in the storage section 460.

The control unit 140a executes the first half of the first storage operation for a preset predetermined time T5, and then ends the first half of the first storage operation and starts the second half of the first storage operation. The preset time T5 is set, for example, to a length that allows the liquid refrigerant in the refrigerant circulation path 150A to be stored in the storage unit 460.

(Second half of the operation)
The latter half of the first storage operation is an operation for storing, in storage section 460, mainly gas refrigerant that has not been stored in storage section 460 even by performing the first half of the first storage operation and remains in outdoor refrigerant flow path 121. Fig. 11 is a schematic diagram showing the flow of refrigerant R in the latter half of the first storage operation.

In the latter half of the first storage operation, the control unit 140a opens the on-off valve 230a. The other devices are maintained in the state they were in during the first half of the first storage operation.

By performing the latter half of the first storage operation, as shown by the arrow in FIG. 11, the gas refrigerant R stored in the storage section 460 flows into the first tube 410 through the on-off valve 230a. The refrigerant R that flows into the first tube 410 is sent to the outdoor refrigerant flow path 121A, passes through the flow path switching mechanism 125A, and is sucked into the first compressor 122A. The refrigerant R that is sucked into the first compressor 122A is discharged from the first compressor 122A and passes through the outdoor heat exchanger 123A. The refrigerant R that passes through the outdoor heat exchanger 123A is sent to the outdoor expansion mechanism 124A, but since the outdoor expansion mechanism 124A is in a closed state, it flows into the liquid side branch pipe 129A. The refrigerant R that flows into the liquid side branch pipe 129A passes through the second tube 420 and returns to the storage section 460.

The control unit 140a executes the latter half of the first storage operation for a preset predetermined time T6, and then ends the latter half of the first storage operation. The predetermined time T6 is set, for example, to a length that allows the refrigerant R remaining in the refrigerant circulation path 150A after the execution of the first half of the first storage operation to be collected in the storage unit 460.

As described above, when the control unit 140a executes the first storage operation, even if refrigerant R leaks from the refrigerant circulation path 150A, the refrigerant R in the refrigerant circulation path 150A is stored in the storage unit 460, thereby further suppressing leakage of the refrigerant R.

(2-1-2) Second Storage Operation The second storage operation is an operation for transferring the refrigerant R from the refrigerant circulation path 150 to the storage section 460 when the refrigerant R leaks from the refrigerant circulation path 150 of the second refrigeration cycle apparatus 100B. The second storage operation is similar to the first storage operation.

(First half of the action)
In the first half of the second storage operation, the control unit 140b opens the indoor expansion mechanism 113B for all indoor units 110B. In addition, the control unit 140b closes the outdoor expansion mechanism 124B of the second refrigeration cycle device 100B for the outdoor unit 120B, sets the flow path switching mechanism 125B to the first state, and operates the first compressor 122 (On). Furthermore, the control unit 140b opens the on-off valve 230d and closes the on-off valves 230 other than the on-off valve 230d. Specifically, the control unit 140b closes the on-off valves 230a, 230b, and 230c.

By executing the first half of the second storage operation, the refrigerant R in the indoor refrigerant flow path 111B is sucked by the first compressor 122B of the outdoor unit 120B. After being discharged from the first compressor 122B, the refrigerant R passes through the flow path switching mechanism 125B and the outdoor heat exchanger 123B. The refrigerant R that passes through the outdoor heat exchanger 123B is sent to the outdoor expansion mechanism 124B, but since the outdoor expansion mechanism 124B is in a closed state, it flows into the liquid side branch pipe 129B. The refrigerant R that flows into the liquid side branch pipe 129B passes through the fourth pipe 440 and the liquid side pipe 452 and flows into the storage section 460. Since the on-off valves 230 other than the on-off valve 230d of the refrigerant amount measurement system 4 are in a closed state, the refrigerant R that flows in is stored in the storage section 460.

The control unit 140d executes the first half of the second storage operation for a preset predetermined time T7, and then ends the first half of the second storage operation and starts the second half of the second storage operation. The preset time T7 is set, for example, to a length that allows the liquid refrigerant in the refrigerant circulation path 150B to be stored in the storage unit 460.

(Second half of the operation)
In the latter half of the second storing operation, the control unit 140d opens the on-off valve 230c. For the other devices, the states in the first half of the operation of transferring the refrigerant R to the storing unit 460 are maintained.

By executing the latter half of the second storage operation, the gas refrigerant of the refrigerant R stored in the storage section 460 flows into the third tube 430 through the on-off valve 230c. The refrigerant R that flows into the third tube 430 is sent to the outdoor refrigerant flow path 121B, passes through the flow path switching mechanism 125B, and is sucked into the first compressor 122B. The refrigerant R that is sucked into the first compressor 122B is discharged from the first compressor 122B and passes through the outdoor heat exchanger 123B. The refrigerant R that passes through the outdoor heat exchanger 123B is sent to the outdoor expansion mechanism 124B, but since the outdoor expansion mechanism 124B is in a closed state, it flows into the liquid side branch pipe 129B. The refrigerant R that flows into the liquid side branch pipe 129B passes through the fourth tube 440 and returns to the storage section 460.

The control unit 140b performs the latter half of the second storage operation for a preset predetermined time T8, and then ends the latter half of the second storage operation. The predetermined time T8 is set, for example, to a length that allows the refrigerant remaining in the refrigerant circulation path 150B after the latter half of the second storage operation is performed to be collected in the storage unit 460.

As described above, even if refrigerant R leaks from refrigerant circulation path 150B, the control unit 140b executes the second storage operation, so that the refrigerant R in the refrigerant circulation path 150B is stored in the storage unit 460, thereby further preventing the refrigerant R from leaking.

(3) Features In the refrigerant amount measurement system 4, the control unit 140 performs a first storage operation and a second storage operation. The first storage operation is an operation of transferring refrigerant R from the first refrigerant circuit to the storage unit 460 when refrigerant R leaks from the first refrigerant circuit. The second storage operation is an operation of transferring refrigerant R from the second refrigerant circuit to the storage unit 460 when refrigerant R leaks from the second refrigerant circuit.

The control unit 140 of the refrigerant amount measurement system 4 performs a first storage operation. Therefore, when refrigerant R leaks from the first refrigerant circuit, the refrigerant R in the first refrigerant circuit is stored in the storage unit 460, and the refrigerant R can be prevented from being released into the atmosphere. The control unit 140 of the refrigerant amount measurement system 4 performs a second storage operation. Therefore, when refrigerant R leaks from the second refrigerant circuit, the refrigerant R in the second refrigerant circuit is stored in the storage unit 460, and the refrigerant R can be prevented from being released into the atmosphere.

Third Embodiment
(1) Overall Configuration A refrigerant using system 1 according to a third embodiment of the present disclosure will be described, focusing on the differences from the refrigerant using system 1 according to the first embodiment.

The measurement unit 401 of the refrigerant-using system 1 according to the third embodiment further includes a cylindrical member 462 in addition to the components of the measurement unit 401 of the refrigerant-using system 1 according to the first embodiment. The measurement unit 401 includes a measurement calculation unit 471, an electrode rod 461, and a cylindrical member 462.

(2) Detailed Configuration Fig. 12A is a schematic diagram showing the storage section 460, the electrode bar 461, and the cylindrical member 462. The cylindrical member 462 is a member that surrounds the electrode bar 461. Fig. 12B is a cross-sectional view showing the cross section A in Fig. 12A. Unlike the first embodiment, the measurement calculation section 471 uses the distance X between the electrode bar 461 and the cylindrical member 462 to measure the amount of refrigerant.

The cylindrical member 462 allows the measurement unit 401 to measure the amount of refrigerant with high accuracy even when the positional relationship between the storage unit 460 and the electrode rod 461 changes or when the shape of the wall surface of the storage unit 460 changes. In addition, since the amount of refrigerant can be measured with high accuracy regardless of the shape of the storage unit 460, the shape of the electrode rod 461, the position of the electrode rod 461, etc., the design and manufacture of the refrigerant amount measurement system 4 becomes easier.

(3) Features In the refrigerant amount measurement system 4 , the measurement unit 401 further includes a cylindrical member 462 that surrounds the electrode rod 461 .

The measurement unit 401 of the refrigerant amount measurement system 4 further includes a cylindrical member 462 that surrounds the electrode rod 461. Therefore, the refrigerant amount measurement system 4 can more clearly determine the amount of refrigerant R filled and the amount of leakage by using the cylindrical member 462.

(4) Modifications (4-1) Modification 1A
In the above embodiment, the measurement unit 401 measures the amount of refrigerant R by a capacitance type method. However, the method of measuring the amount of refrigerant R by the measurement unit 401 is not limited to this. The measurement unit 401 may measure the amount of refrigerant R by at least one of a radio wave type, an ultrasonic type, a float type, a pressure type, a differential pressure type, and a capacitance type.

The radio wave type is a method for measuring the amount of refrigerant by measuring the time it takes for radio waves to reflect off the liquid surface of refrigerant R and return. The ultrasonic type is a method for measuring the amount of refrigerant by measuring the time it takes for ultrasonic waves to reflect off the liquid surface of refrigerant R and return. The float type is a method for measuring the amount of refrigerant by measuring the height of a float floating on the liquid surface of refrigerant R. The pressure type is a method for measuring the amount of refrigerant by measuring the pressure value of the bottom surface of refrigerant R. The differential pressure type is a method for measuring the amount of refrigerant by measuring the differential pressure value between the bottom surface of the liquid and the top surface of the storage section 460.

In the refrigerant amount measurement system 4 according to this embodiment, the measurement unit 401 measures the amount of refrigerant R using at least one of the following methods: radio wave type, ultrasonic type, float type, pressure type, differential pressure type, and capacitance type.

The measurement unit 401 of the refrigerant amount measurement system 4 measures the amount of refrigerant R using at least one of the following methods: radio wave type, ultrasonic type, float type, pressure type, differential pressure type, and capacitance type. Therefore, the refrigerant amount measurement system 4 can more clearly determine the amount of refrigerant R filled and the amount of leakage based on a variety of methods.

Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the present disclosure as set forth in the claims.

REFRIGERATION CYCLE SYSTEM 1 Refrigerant usage system 4 Refrigerant amount measurement system 100 Refrigeration cycle device 100A First refrigeration cycle device 100B Second refrigeration cycle device 110 Indoor unit 111 Indoor refrigerant flow path 112 Indoor heat exchanger 113 Indoor expansion mechanism 114 Gas side connection part 115 Liquid side connection part 116 Detection part 120 Outdoor unit 121 Outdoor refrigerant flow path 121b First refrigerant piping 121c Second refrigerant piping 121d Third refrigerant piping 122 First compressor 123 Outdoor heat exchanger 124 Outdoor expansion mechanism 125 Flow path switching mechanism 126 Gas side connection part 127 Liquid side connection part 128 Gas side branch piping 129 Liquid side branch piping 131 Gas side connection piping 132 Liquid side connection piping 140 (140a, 140b) Control unit 150 Refrigerant circulation path 230 (230a, 230b, 230c, 230d) Opening and closing valve 400 Connection unit 401 Measurement unit 410 First pipe 420 Second pipe 430 Third pipe 440 Fourth pipe 451 Gas side pipe 452 Liquid side pipe 455 Check valve 460 Storage unit 461 Electrode rod 462 Cylindrical member 470 Calculation device 471 Measurement calculation unit 472 Memory unit

JP 2010-190545 A

Claims (10)

A refrigerant using system (1) including a first refrigeration cycle apparatus (100A), a refrigerant amount measuring system (4), and a control unit (140),
The first refrigeration cycle device (100A) comprises:
a first refrigerant circuit including a first compressor (122), an outdoor heat exchanger (123), and an indoor heat exchanger (112);
having
The refrigerant amount measurement system (4) comprises:
a connection portion (400) connected to the first refrigerant circuit and having a first pipe (410) and a second pipe (420), each of which is provided with an on-off valve (230);
a storage section (460) that stores the refrigerant (R) in the first refrigerant circuit through the connection section and returns the stored refrigerant to the first refrigerant circuit through the connection section;
A measurement unit (401) for measuring the amount of the refrigerant in the storage unit;
A memory unit (472) that stores the measurement results measured by the measurement unit;
having
The control unit (140)
Controlling the first compressor of the first refrigeration cycle device to perform normal operation;
and,
performing a first refrigerant amount measurement operation by controlling the first compressor and the on-off valve of the refrigerant amount measurement system of the first refrigeration cycle device to transfer the refrigerant from the first refrigerant circuit to the storage section, causing the measurement section to measure the amount of the refrigerant, and returning the refrigerant from the storage section to the first refrigerant circuit;
The control unit performs the first refrigerant amount measuring operation during a time period when normal operation of the first refrigeration cycle device is stopped.
Refrigerant-using system (1) . a connection part (400) connected to a first refrigerant circuit of a first refrigeration cycle device (100A) and having a first pipe (410) and a second pipe (420), each of which is provided with an on-off valve (230);
a storage section (460) that stores the refrigerant (R) in the first refrigerant circuit through the connection section and returns the stored refrigerant to the first refrigerant circuit through the connection section;
A measurement unit (401) for measuring the amount of the refrigerant in the storage unit;
A memory unit (472) that stores the measurement results measured by the measurement unit;
a control unit (140) that performs a first refrigerant amount measurement operation by controlling the first refrigeration cycle device and the on-off valve to transfer the refrigerant from the first refrigerant circuit to the storage unit, cause the measurement unit to measure the amount of the refrigerant, and return the refrigerant from the storage unit to the first refrigerant circuit;
Equipped with
The control unit performs the first refrigerant amount measuring operation during a time period when a normal operation of the first refrigeration cycle device is stopped,
The control unit performs a first storing operation of transferring the refrigerant from the first refrigerant circuit to the storing unit when the refrigerant leaks from the first refrigerant circuit.
Refrigerant quantity measurement system (4). The control unit, in the first refrigerant amount measuring operation, causes the measuring unit to measure a refrigerant charge amount of the first refrigerant circuit of the first refrigeration cycle device.
A refrigerant-using system (1) according to claim 1 . The storage unit is externally connected to the first refrigerant circuit of the first refrigeration cycle device.
A refrigerant-using system (1) according to claim 1 or claim 3. a connection part (400) connected to a first refrigerant circuit of a first refrigeration cycle device (100A) and having a first pipe (410) and a second pipe (420), each of which is provided with an on-off valve (230);
a storage section (460) that stores the refrigerant (R) in the first refrigerant circuit through the connection section and returns the stored refrigerant to the first refrigerant circuit through the connection section;
A measurement unit (401) for measuring the amount of the refrigerant in the storage unit;
A memory unit (472) that stores the measurement results measured by the measurement unit;
a control unit (140) that performs a first refrigerant amount measurement operation by controlling the first refrigeration cycle device and the on-off valve to transfer the refrigerant from the first refrigerant circuit to the storage unit, cause the measurement unit to measure the amount of the refrigerant, and return the refrigerant from the storage unit to the first refrigerant circuit;
Equipped with
The control unit performs the first refrigerant amount measuring operation during a time period when a normal operation of the first refrigeration cycle device is stopped,
The connection part is also connected to a second refrigerant circuit of a second refrigeration cycle device (100B),
The connection portion further includes a third pipe (430) and a fourth pipe (440) each provided with an on-off valve,
The connection portion is connected to the first refrigerant circuit by the first pipe and the second pipe, and is connected to the second refrigerant circuit by the third pipe and the fourth pipe.
Refrigerant quantity measurement system. The control unit further performs a second refrigerant amount measurement operation by controlling the second refrigeration cycle device and the on-off valve to transfer the refrigerant from the second refrigerant circuit to the storage unit, causing the measurement unit to measure the amount of the refrigerant, and returning the refrigerant from the storage unit to the second refrigerant circuit.
6. A refrigerant amount measurement system according to claim 5. The control unit performs the first refrigerant amount measuring operation and the second refrigerant amount measuring operation at different times.
7. The refrigerant amount measurement system of claim 6. The control unit performs the second refrigerant amount measuring operation during a time period when normal operation of the second refrigeration cycle device is stopped.
7. The refrigerant amount measurement system of claim 6. The control unit performs a second storing operation of transferring the refrigerant from the second refrigerant circuit to the storing unit when the refrigerant leaks from the second refrigerant circuit.
6. A refrigerant amount measurement system according to claim 5. The measurement unit measures the amount of the refrigerant by at least one of a radio wave type, an ultrasonic type, a float type, a pressure type, a differential pressure type, and a capacitance type.
A refrigerant-using system (1) according to claim 1.

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