JP6570745B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner, and more particularly to control when refrigerant leaks.

  Conventionally, a compressor, a four-way valve, a heat source side heat exchanger, a use side expansion device, and a use side heat exchanger are sequentially connected by piping, and have a refrigerant circuit in which refrigerant circulates. There is an air conditioner configured by connecting a heat source device including an exchanger and an indoor unit including a throttle device and a use-side heat exchanger with a gas pipe and a liquid pipe. In this type of air conditioner, when refrigerant leakage occurs in the indoor unit, a pump-down operation is performed to collect the indoor unit side refrigerant in the heat source unit in order to prevent the room from becoming deficient. (For example, refer to Patent Document 1).

  In the air conditioner of Patent Document 1, an open / close valve is provided in the liquid pipe between the heat source side heat exchanger and the use side expansion device, and when a refrigerant leak is detected by the gas detector, the four-way valve is set to the cooling operation side. The pump down operation is performed by starting the compressor with the use side throttle device fully opened and the on-off valve closed. Then, after this pump-down operation is completed, the piping constituting the refrigerant circuit is removed, and work such as failure repair is performed.

JP 2002-228281 A

  A conventional air conditioner such as Patent Document 1 cannot recover all of the refrigerant present in the indoor unit and piping in the refrigerant circuit into the heat source apparatus by refrigerant recovery by pump-down operation. Therefore, the refrigerant | coolant which remained in piping after completion | finish of pump down operation had the subject that it would flow out indoors.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an air conditioner that can reduce the amount of refrigerant leakage into the room at the time of refrigerant leakage.

An air conditioner according to the present invention includes a compressor, a first flow path switching device, a heat source device having a heat source side heat exchanger, an indoor unit having a throttle device and a use side heat exchanger, the heat source device, has a liquid pipe and a gas pipe connecting the indoor unit, the compressor, the first channel switching device, the heat source-side heat exchanger, the expansion device, and the utilization-side heat exchanger are connected by piping a refrigerant circuit in which the refrigerant circulates, a first bypass pipe connecting the liquid pipe and the gas pipe, a second bypass pipe for releasing the refrigerant to the outdoor branches from the first bypass pipe, before SL gas A first opening / closing device provided in the pipe, a second opening / closing device provided in the second bypass pipe, a refrigerant leakage detector for detecting refrigerant leakage from the refrigerant circuit, and detecting refrigerant leakage during cooling operation If the second opening / closing device is closed, Starts down operation, after completion of the pump down operation, thereby closing the first switching device, when detecting refrigerant leakage, in which and a control unit for opening said second switching device.

  According to the air conditioner of the present invention, when refrigerant leakage is detected even after the pump-down operation is completed, the second opening and closing device is opened so that the refrigerant remaining in the indoor unit and the pipe in the refrigerant circuit is second bypassed. Release from piping to the outdoors. By doing so, the amount of refrigerant leakage into the room at the time of refrigerant leakage can be reduced.

It is a refrigerant circuit figure of the air harmony device concerning Embodiment 1 of the present invention. It is a functional block diagram of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a refrigerant circuit diagram which shows the flow of the refrigerant | coolant at the time of air_conditionaing | cooling operation of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a refrigerant circuit diagram which shows the flow of the refrigerant | coolant at the time of the heating operation of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows the operation | movement at the time of the refrigerant | coolant leakage detection of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is the schematic which shows the state of the refrigerant circuit in step S6 of the flowchart shown in FIG. It is the schematic which shows the state of the refrigerant circuit in step S9 of the flowchart shown in FIG. It is the schematic which shows the state of the refrigerant circuit in step S12 of the flowchart shown in FIG. It is the schematic which shows the state of the refrigerant circuit in step S14 of the flowchart shown in FIG. It is a functional block diagram of the air conditioning apparatus which concerns on Embodiment 2 of this invention. It is a flowchart which shows the operation | movement at the time of the refrigerant | coolant leakage detection of the air conditioning apparatus which concerns on Embodiment 2 of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Moreover, in the following drawings, the relationship of the size of each component may be different from the actual one.

Embodiment 1 FIG.
FIG. 1 is a refrigerant circuit diagram of the air-conditioning apparatus according to Embodiment 1 of the present invention.
Hereinafter, the configuration of the air-conditioning apparatus according to Embodiment 1 will be described with reference to FIG.
As shown in FIG. 1, the air-conditioning apparatus according to Embodiment 1 includes a heat source unit 10 and a plurality of indoor units 20, and the indoor unit 20 is a liquid pipe 31 and a gas pipe with respect to the heat source unit 10. 32 are connected in parallel.
The air conditioner includes a refrigerant circuit in which the compressor 11, the first flow path switching device 12, the heat source side heat exchanger 13, the expansion device 22, and the use side heat exchanger 21 are sequentially connected by a pipe so that the refrigerant circulates. Have. The air conditioner can perform a cooling operation or a heating operation by circulating the refrigerant in the refrigerant circuit.

  In addition, in this Embodiment 1, although illustrated about the case where the two indoor units 20 are connected to the one heat source unit 10, the number of the heat source units 10 may be two or more. The number of indoor units 20 may be one or three or more.

The heat source device 10 includes a compressor 11, a first flow path switching device 12, and a heat source side heat exchanger 13, and has a function of supplying warm or cold to the indoor unit 20.
The compressor 11 compresses the sucked refrigerant into a high temperature / high pressure state. The first flow path switching device 12 switches the refrigerant flow between the cooling operation and the heating operation. In addition, although illustrated about the case where the 1st flow-path switching apparatus 12 is a four-way valve, you may be comprised by combining a two-way valve or a three-way valve. The heat source side heat exchanger 13 functions as a condenser or a radiator during cooling operation, functions as an evaporator during heating operation, and performs heat exchange between air supplied from a blower (not shown) and the refrigerant. Is.

Further, the heat source device 10 is provided with a control device 50, a discharge pressure detector 61, and a suction pressure detector 62. The control device 50 will be described later.
The discharge pressure detector 61 is provided in a pipe connecting the first flow path switching device 12 and the discharge side of the compressor 11, and detects the discharge pressure of the compressor 11. The discharge pressure detector 61 includes, for example, a pressure sensor and outputs a detected discharge pressure signal to the control device 50.

  The discharge pressure detector 61 may have a storage device or the like. In this case, the discharge pressure detector 61 accumulates the detected discharge pressure data in a storage device or the like for a predetermined period, and outputs a detected discharge pressure signal to the control device 50 at predetermined intervals.

  The suction pressure detector 62 is provided in a pipe connecting the first flow path switching device 12 and the suction side of the compressor 11, and detects the suction pressure of the compressor 11. The suction pressure detector 62 includes, for example, a pressure sensor and outputs a detected suction pressure signal to the control device 50.

  The suction pressure detector 62 may have a storage device or the like. In this case, the suction pressure detector 62 accumulates the detected suction pressure data in a storage device or the like for a predetermined period, and outputs the detected suction pressure signal to the control device 50 at every predetermined cycle.

  The indoor unit 20 includes a use-side heat exchanger 21 and an expansion device 22, and has a function of cooling or heating an air-conditioning target space such as a room by using heat or cold supplied from the heat source device 10. . The use side heat exchanger 21 functions as an evaporator during the cooling operation and functions as a condenser or a radiator during the heating operation, and performs heat exchange between the refrigerant and the air. The expansion device 22 functions as a pressure reducing valve or an expansion valve, and expands the refrigerant by reducing the pressure.

In addition, a refrigerant leak detector 63 is provided in each pipe that branches from the liquid pipe 31 to each indoor unit 20.
The refrigerant leak detector 63 is a refrigerant leak detection unit that detects refrigerant leak and outputs a signal. For example, the refrigerant leak detector 63 detects a change in resistance value that occurs when the metal oxide semiconductor contacts the refrigerant gas. This is a semiconductor gas sensor that detects the concentration. In the first embodiment, the refrigerant leak detector 63 is set in a 1: 1 relationship with respect to each indoor unit 20 so that it can be determined in which indoor unit 20 system the refrigerant leak has occurred. Although it is the structure provided, the structure provided with one with respect to the air conditioning apparatus may be sufficient. Even with such a configuration, it is possible to determine whether refrigerant leakage has occurred in the air conditioner.

The liquid pipe 31 is provided with a second flow path switching device 33, and the gas pipe 32 is provided with a first opening / closing device 34.
Further, between the heat source device 10 and the indoor unit 20, a first bypass pipe 41 connecting the liquid pipe 31 and the gas pipe 32, and a second bypass branching from the first bypass pipe 41 and having one end being an open end. A bypass circuit 40 including a pipe 42 and a second opening / closing device 43 provided in the second bypass pipe 42 is provided.

The second flow path switching device 33 opens and closes the heat source device 10 side of the liquid pipe 31, the indoor unit 20 side of the liquid pipe 31, and the first bypass pipe 41 side, respectively, and switches the flow of the refrigerant. In addition, although the 2nd flow-path switching apparatus 33 illustrated about the case where it is a three-way valve, you may be comprised by combining a two-way valve etc.
The first opening / closing device 34 and the second opening / closing device 43 are opened and closed to conduct the refrigerant or to block the refrigerant.

Moreover, as shown in FIG. 1, the broken line 70 has shown the boundary line of the outdoors and indoors, the heat-source equipment 10 and the bypass circuit 40 are arrange | positioned outdoors, and the indoor unit 20 and the refrigerant | coolant leak detector 63 are indoors. Is arranged.
In the first embodiment, the bypass circuit 40 is disposed outdoors. However, the present invention is not limited thereto, and the other may be indoors as long as at least the open end of the second bypass pipe 42 is disposed outdoors.

FIG. 2 is a functional block diagram of the air-conditioning apparatus according to Embodiment 1 of the present invention.
The control device 50 of the air-conditioning apparatus according to Embodiment 1 includes a measurement unit 51, a calculation unit 52, a determination unit 53, and a drive unit 54. The control device 50 is configured to receive signals from the discharge pressure detector 61, the suction pressure detector 62, and the refrigerant leak detector 63. In addition, a signal is output to the second flow path switching device 33, the first opening / closing device 34, and the second opening / closing device 43.

The measuring unit 51 acquires detection signals from the discharge pressure detector 61, the suction pressure detector 62, and the refrigerant leak detector 63.
The calculation unit 52 processes each detection signal acquired by the measurement unit 51.
The determination unit 53 performs various determinations based on the processing result of the calculation unit 52.
The drive part 54 outputs a drive signal to the 2nd flow-path switching apparatus 33, the 1st switching apparatus 34, and the 2nd switching apparatus 43 based on the determination result of the determination part 53, and drives them.

FIG. 3 is a refrigerant circuit diagram illustrating the refrigerant flow during the cooling operation of the air-conditioning apparatus according to Embodiment 1 of the present invention. In FIG. 3, the refrigerant is indicated by a solid arrow, and among the second flow path switching device 33, the first opening / closing device 34, and the second opening / closing device 43, the closed portion is indicated by black. The same applies to FIG. 4 and FIGS.
Hereinafter, the flow of the refrigerant during the cooling operation of the air-conditioning apparatus according to Embodiment 1 will be described with reference to FIG.

During the cooling operation, the first flow path switching device 12 is switched to the cooling operation side, that is, the discharge side of the compressor 11 and the heat source side heat exchanger 13 are connected to each other. The first bypass pipe 41 side and the first opening / closing device 34 are closed.
The high-temperature and high-pressure gas refrigerant discharged from the compressor 11 of the heat source device 10 passes through the first flow path switching device 12 and is heat-exchanged with outdoor air blown by a blower (not shown) in the heat source side heat exchanger 13. To condense. The condensed and liquefied refrigerant flows out of the heat source device 10. The refrigerant that has flowed out of the heat source device 10 passes through the liquid pipe 31 and the second flow path switching device 33, and then branches to flow into the indoor units 20.

  The refrigerant that has flowed into the indoor unit 20 is decompressed to a low pressure by the expansion device 22. The decompressed refrigerant is heat-exchanged with room air in the use-side heat exchanger 21 to evaporate. Then, the refrigerants in the gas state respectively flow out from the indoor unit 20, merge in the gas pipe 32, pass through the first opening / closing device 34, and flow into the heat source unit 10. The refrigerant flowing into the heat source device 10 is sucked into the compressor 11 through the first flow path switching device 12.

FIG. 4 is a refrigerant circuit diagram illustrating a refrigerant flow during the heating operation of the air-conditioning apparatus according to Embodiment 1 of the present invention.
Hereinafter, the flow of the refrigerant during the heating operation of the air-conditioning apparatus according to Embodiment 1 will be described with reference to FIG.

During the heating operation, the first flow path switching device 12 is switched to the heating operation side, that is, the suction side of the compressor 11 and the heat source side heat exchanger 13 are connected. The first bypass pipe 41 side and the first opening / closing device 34 are closed.
The high-temperature and high-pressure gas refrigerant discharged from the compressor 11 of the heat source device 10 flows out of the heat source device 10 through the first flow path switching device 12. The refrigerant that has flowed out of the heat source device 10 passes through the gas pipe 32 and the first opening / closing device 34, and then branches to flow into the indoor units 20.

  The refrigerant that has flowed into the indoor unit 20 is subjected to heat exchange with indoor air in the use-side heat exchanger 21 to be condensed and liquefied. The condensed and liquefied refrigerant is decompressed to a low pressure by the expansion device 22. The decompressed refrigerant flows out from the indoor unit 20, merges in the liquid pipe 31, passes through the second flow path switching device 33, and flows into the heat source unit 10. The refrigerant that has flowed into the heat source device 10 is subjected to heat exchange with outdoor air blown by a blower (not shown) in the heat source side heat exchanger 13 to be evaporated and gasified. The gasified refrigerant is sucked into the compressor 11 through the first flow path switching device 12.

  FIG. 5 is a flowchart showing the operation at the time of refrigerant leakage detection of the air-conditioning apparatus according to Embodiment 1 of the present invention, and FIG. 6 shows the state of the refrigerant circuit in step S6 of the flowchart shown in FIG. FIG. 7 is a schematic diagram showing the state of the refrigerant circuit in step S9 of the flowchart shown in FIG. 5, and FIG. 8 shows the state of the refrigerant circuit in step S12 of the flowchart shown in FIG. FIG. 9 is a schematic diagram, and FIG. 9 is a schematic diagram showing the state of the refrigerant circuit at step S14 in the flowchart shown in FIG.

Hereinafter, the operation | movement at the time of the refrigerant | coolant leakage detection of the air conditioning apparatus which concerns on this Embodiment 1 is demonstrated with reference to FIGS.
The determination unit 53 determines whether or not refrigerant leakage has occurred based on the detection result of the refrigerant leakage detector 63 (step S1).

If the determination unit 53 determines that refrigerant leakage has not occurred (No in step S1), the determination unit 53 returns to step S1.
On the other hand, the determination part 53 determines whether the present driving | operation is a cooling operation, when it determines with the refrigerant | coolant leakage having generate | occur | produced (Yes of step S1) (step S2).

When the determination unit 53 determines that the current operation is the cooling operation (Yes in Step S2), the drive unit 54 switches the second flow path switching device 33 (Step S9) and starts the pump down operation (Step S10). ).
On the other hand, when the determination unit 53 determines that the current operation is not the cooling operation, that is, the heating operation (No in Step S2), the drive unit 54 switches the first flow path switching device 12 to the cooling operation side, and the compressor 11 is stopped (step S3). Here, the compressor 11 is stopped. However, when the current operation is the heating operation, the flow of the refrigerant is opposite to that of the cooling operation, so the compressor 11 is stopped once to switch the operation to the cooling operation. Because it is necessary to do.

  After step S <b> 3, the calculation unit 52 obtains a pressure difference ΔP (= discharge side pressure−suction side pressure) from the detection signals of the discharge pressure detector 61 and the suction pressure detector 62 acquired by the measurement unit 51. And the determination part 53 determines whether the pressure difference (DELTA) P is a value smaller than the reference | standard differential pressure P1 (step S4). Here, the reference differential pressure P1 is a differential pressure that does not fail even when the compressor 11 is operated, and is 0, for example. The reference differential pressure P1 is stored in advance in a storage device provided in the calculation unit 52 or a storage device separate from the calculation unit 52 (both not shown). In general, when the compressor 11 is stopped once, the air conditioner waits for pressure equalization in the refrigerant circuit so that the compressor 11 is not damaged. Therefore, the air conditioner does not restart the compressor 11 for a predetermined time, for example, 3 minutes. It is like that.

In step S4, when the determination unit 53 determines that the pressure difference ΔP is smaller than the reference differential pressure P1 (Yes in step S4), the driving unit 54 operates the compressor 11 (step S5).
On the other hand, when the determination unit 53 determines that the pressure difference ΔP is not a value smaller than the reference differential pressure P1 (No in step S4), the drive unit 54 switches the second flow path switching device 33 as shown in FIG. Switching is performed and the second opening / closing device 43 is opened (step S6). That is, by opening the first bypass pipe 41 side of the second flow path switching device 33, the liquid pipe 31 and the gas pipe 32 are communicated to promote pressure equalization. Furthermore, by opening the second opening / closing device 43, the refrigerant in the refrigerant circuit is discharged from the second bypass pipe 42 to the outside, and the amount of refrigerant leakage from the leakage portion 71 is reduced.

After step S6, when the determination unit 53 determines that the pressure difference ΔP is not a value smaller than the reference differential pressure P1 (No in step S7), the process returns to step S7.
On the other hand, when the determination unit 53 determines that the pressure difference ΔP is smaller than the reference differential pressure P1 (Yes in step S7), the drive unit 54 closes the second opening / closing device 43 (step S8) and compresses it. The machine 11 is operated (step S5).

  After step S5, the drive unit 54 switches the second flow path switching device 33 (step S9) and starts the pump down operation (step S10). At this time, as shown in FIG. 7, the second flow path switching device 33 is closed on the heat source unit 10 side so that the refrigerant does not flow from the heat source unit 10 side to the indoor unit 20 side. On the other hand, the refrigerant flows from the indoor unit 20 side to the heat source unit 10 side, and the refrigerant present in the indoor unit 20 and the piping in the refrigerant circuit is recovered to the heat source unit 10.

After step S10, the determination unit 53 determines whether or not the refrigerant recovery has been completed (step S11). In addition, about recovery | restoration determination of a refrigerant | coolant, when a liquid level determination means (not shown) is attached in the heat source machine 10, for example, it can be determined that recovery is completed when a certain amount is exceeded. Or if it collects with liquid refrigerant, since the suction side of compressor 11 will be sucked in with gas refrigerant, suction pressure will fall. This can be detected by the suction pressure detector 62, and it can be determined that the recovery is completed when the pressure becomes a predetermined pressure, for example, less than 1 kg / cm ² .

If the determination unit 53 determines in step S11 that the refrigerant recovery has not been completed (No in step S11), the process returns to step S11.
On the other hand, when the determination part 53 determines that the recovery of the refrigerant has been completed (Yes in step S11), the drive part 54 finishes the pump-down operation and closes the first opening / closing device 34 as shown in FIG. S12). By doing so, the refrigerant is confined in the heat source unit 10.

After step S12, the determination unit 53 determines whether refrigerant leakage has occurred based on the result of the calculation unit 52 processing the detection signal of the refrigerant leakage detector 63 (step S13).
If the determination unit 53 determines that refrigerant leakage has occurred (Yes in step S13), the drive unit 54 opens the second opening / closing device 43 as shown in FIG. 9 (step S14), and returns to step S13. . Thus, when refrigerant leakage is detected even after the pump-down operation is completed, the refrigerant is released to the outdoors from the second bypass pipe 42 by opening the second opening / closing device 43. At this time, the refrigerant discharge amount from the second bypass pipe 42 >> the refrigerant leak quantity from the leak location 71. Since the refrigerant is drawn toward the second bypass pipe 42, the refrigerant leak amount from the leak location 71 to the room is reduced. Can be reduced.

  On the other hand, when the determination part 53 determines that the refrigerant | coolant leakage has not generate | occur | produced (No of step S13), the drive part 54 closes the 2nd opening / closing apparatus 43 (step S15), and returns to step S13. That is, the refrigerant circuit is brought into the state shown in FIG.

  Thereafter, the drive unit 54 opens the second opening / closing device 43 (step S14) or closes the second opening / closing device 43 in accordance with the occurrence of the refrigerant leakage (step S15).

  As described above, according to the air-conditioning apparatus according to Embodiment 1, when refrigerant leakage is detected even after the end of the pump-down operation, the second opening / closing device 43 is opened to open the indoor unit 20 in the refrigerant circuit. The refrigerant remaining in the pipe is discharged from the second bypass pipe 42 to the outside. By doing so, the amount of refrigerant leakage into the room at the time of refrigerant leakage can be reduced.

Further, conventionally, since the pump-down operation is performed in the cooling operation, there is a problem that when refrigerant leakage is detected during the heating operation, it takes time to switch to the cooling operation and the amount of refrigerant leakage increases. .
Therefore, in the air conditioner according to the first embodiment, when the refrigerant leakage is detected during the heating operation, the first bypass pipe 41 side of the second flow path switching device 33 is opened. By doing so, the liquid pipe 31 and the gas pipe 32 are communicated with each other, the pressure equalization of the refrigerant can be promoted, the switching time to the cooling operation can be shortened, and the amount of refrigerant leakage into the room can be reduced. .

Embodiment 2. FIG.
Hereinafter, Embodiment 2 of the present invention will be described, but the description overlapping with Embodiment 1 will be omitted, and the same reference numerals will be given to the same or corresponding parts as those in Embodiment 1.

FIG. 10 is a functional block diagram of the air-conditioning apparatus according to Embodiment 2 of the present invention.
As shown in FIG. 10, the air-conditioning apparatus according to Embodiment 2 includes a second control device 80 separately from the control device 50 provided in the heat source device 10.
The second control device 80 includes a second measurement unit 81, a second calculation unit 82, a second determination unit 83, and a second drive unit 84. The control device 50 is configured to receive signals from the discharge pressure detector 61 and the suction pressure detector 62, and the second control device 80 is configured to receive signals from the refrigerant leakage detector 63. . Further, the second control device 80 outputs signals to the second flow path switching device 33, the first opening / closing device 34, and the second opening / closing device 43.

The second measuring unit 81 acquires the refrigerant leak detector 63 detection signal.
The second calculation unit 82 processes the detection signal acquired by the second measurement unit 81.
The second determination unit 83 performs various determinations based on the processing result of the second calculation unit 82.
Based on the determination result of the second determination unit 83, the second drive unit 84 outputs a drive signal to the second flow path switching device 33, the first opening / closing device 34, and the second opening / closing device 43, and drives them. Is.

  The second control device 80 can communicate with the control device 50. Therefore, the second control device 80 can drive the second flow path switching device 33, the first opening / closing device 34, and the second opening / closing device 43 based on the processing result of the control device 50. For example, the second driving unit 84 drives the second flow path switching device 33, the first opening / closing device 34, and the second opening / closing device 43 based on the driving signal of the driving unit 54.

  The second control device 80 has a power supply system such as a private power generator, and is a power supply system different from the heat source device 10. Therefore, the air conditioner according to the second embodiment includes the second flow path switching device 33, the first opening / closing device 34, and the second opening / closing device 43 even when the heat source unit 10 cannot operate due to a power failure, failure, or the like. Can be driven. And by driving them, the refrigerant in the refrigerant circuit can be discharged to the outdoors from the second bypass pipe 42 even when the heat source device 10 cannot operate due to a power failure, failure, or the like.

FIG. 11 is a flowchart showing an operation at the time of refrigerant leakage detection of the air-conditioning apparatus according to Embodiment 2 of the present invention.
Hereafter, the operation | movement at the time of the leak detection of the refrigerant | coolant of the air conditioning apparatus which concerns on this Embodiment 2 is demonstrated with reference to FIG.
The second determination unit 83 determines whether or not refrigerant leakage has occurred based on the detection result of the refrigerant leakage detector 63 (step S21).

If the second determination unit 83 determines that no refrigerant leakage has occurred (No in step S21), the second determination unit 83 returns to step S21.
On the other hand, when it determines with the refrigerant | coolant leakage having generate | occur | produced, the 2nd determination part 83 determines whether the heat-source equipment 10 is operable (step S22). In addition, the 2nd determination part 83 determines based on the signal regarding the state of the heat-source equipment 10 received from the control apparatus 50, for example.

When the second determination unit 83 determines that the heat source apparatus 10 is operable (Yes in step S22), the process proceeds to step S2 in FIG. Note that the processing after step S2 in FIG. 5 is the same as that described in the first embodiment, and thus description thereof is omitted.
On the other hand, when the determination unit 53 determines that the heat source device 10 is not operable (No in Step S22), the second drive unit 84 switches the second flow path switching device 33 so that the heat source device 10 side is closed, The first opening / closing device 34 is closed, and the second opening / closing device 43 is opened. That is, the refrigerant is discharged from the second bypass pipe 42 to the outside by controlling the second flow path switching device 33, the first opening / closing device 34, and the second opening / closing device 43 as shown in FIG.

  As described above, according to the air conditioner of the second embodiment, the second control device 80 of the power supply system different from the heat source device 10 is provided. Therefore, even when the heat source device 10 cannot operate due to a power failure, failure, or the like, the second control device 80 drives the second flow path switching device 33, the first opening / closing device 34, and the second opening / closing device 43, whereby the refrigerant The refrigerant in the circuit can be discharged from the second bypass pipe 42 to the outside. By doing so, even when the heat source device 10 cannot operate, the amount of refrigerant leakage into the room at the time of refrigerant leakage can be reduced.

  DESCRIPTION OF SYMBOLS 10 Heat source machine, 11 Compressor, 12 1st flow-path switching apparatus, 13 Heat source side heat exchanger, 20 Indoor unit, 21 Utilization side heat exchanger, 22 Expansion apparatus, 31 Liquid pipe, 32 Gas pipe, 33 2nd flow path Switching device, 34 1st switchgear, 40 Bypass circuit, 41 1st bypass piping, 42 2nd bypass piping, 43 2nd switchgear, 50 Control device, 51 Measuring part, 52 Calculation part, 53 Determination part, 54 Drive part 61 Discharge pressure detector, 62 Suction pressure detector, 63 Refrigerant leak detector, 70 Broken line, 71 Leakage location, 80 Second control device, 81 Second measurement unit, 82 Second calculation unit, 83 Second determination unit, 84 Second drive unit.

Claims (6)

A heat source machine having a compressor, a first flow path switching device, and a heat source side heat exchanger;
An indoor unit having an expansion device and a use side heat exchanger;
A liquid pipe and a gas pipe for connecting the heat source unit and the indoor unit;
A refrigerant circuit in which the compressor, the first flow path switching device, the heat source side heat exchanger, the expansion device, and the use side heat exchanger are connected by piping and the refrigerant circulates;
A first bypass pipe connecting the liquid pipe and the gas pipe;
A second bypass pipe that branches off from the first bypass pipe and discharges the refrigerant to the outside;
A first shut-off device provided in the prior SL gas pipe,
A second opening / closing device provided in the second bypass pipe;
A refrigerant leakage detector for detecting refrigerant leakage from the refrigerant circuit;
When refrigerant leakage is detected during cooling operation, the second opening and closing device is closed and pump down operation is started.After the pump down operation is completed, the first opening and closing device is closed and refrigerant leakage is detected. An air conditioner comprising: a control device that opens the second opening / closing device. The control device includes:
A measurement unit for obtaining a detection signal of the refrigerant leak detector;
A calculation unit for processing the detection signal acquired by the measurement unit;
A determination unit that determines whether or not refrigerant leakage has occurred based on the processing result of the arithmetic unit;
If the determination unit determines that refrigerant leakage has occurred during the cooling operation, the second switching device is closed to start the pump-down operation, and after the pump-down operation is completed, the first switching device is closed. The air conditioner according to claim 1, further comprising: a drive unit that opens the second opening / closing device when the determination unit determines that refrigerant leakage has occurred. A heat source machine side of the liquid pipe, an indoor unit side of the liquid pipe, and a second flow path switching device that opens and closes the first bypass pipe side,
The drive unit is
When it is determined that the refrigerant leakage has occurred during the heating operation, the determination unit switches to the cooling operation, opens the first bypass piping side of the second flow path switching device, and opens the second opening / closing device. The air conditioning apparatus according to claim 2. A discharge pressure detector for detecting the pressure on the discharge side of the compressor;
A suction pressure detector for detecting the pressure on the suction side of the compressor,
After the first bypass piping side of the second flow path switching device is opened and the second opening and closing device is opened,
The computing unit is
From the detection signal of the discharge pressure detector and the suction pressure detector acquired by the measurement unit, to determine the pressure difference ΔP,
The drive unit is
When the determination unit determines that the pressure difference ΔP is smaller than the reference differential pressure P1, the indoor unit side of the liquid pipe of the second flow path switching device is closed, and the second opening / closing device is closed. The air conditioner according to claim 3, wherein the pump down operation is started. A second control device of a separate power system from the heat source unit,
The second control device includes:
If the heat source unit is not operational, the heat source apparatus side closing of the second flow path switching unit, closing the first shut-off device, in claim 3 or 4 in which opening the second on-off device The air conditioning apparatus described. The second control device includes:
A second measuring unit for obtaining a detection signal of the refrigerant leak detector;
A second calculation unit for processing the detection signal acquired by the second measurement unit;
A second determination unit that determines whether refrigerant leakage has occurred based on the processing result of the second calculation unit, and whether the heat source unit is operable;
When the second determination unit determines that a refrigerant leak has occurred and determines that the heat source device is not operable, the heat source device side of the second flow path switching device is closed, and the first The air conditioner according to claim 5, further comprising: a second drive unit that closes the opening / closing device and opens the second opening / closing device.

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