JPWO2016129027A1 - Air conditioner - Google Patents

Abstract

The air conditioner is installed between a plurality of heat source units and indoor units, and includes a plurality of shut-off devices that block the flow of the refrigerant flowing through the refrigerant pipe, and a plurality of refrigerant leaks from each heat source unit, respectively. And a control device for controlling operations of the plurality of heat source units, the indoor unit, and the shut-off device. The control device includes: a shut-off control unit that operates a shut-off device connected to a heat source unit in which the refrigerant is leaked when a leak of the refrigerant is detected in the leak detection unit; A capacity setting unit that sets a limited heat exchange capacity in the indoor unit when an operation is performed by a heat source unit connected to the non-operating shut-off device when the device and the non-operating shut-off device exist; An operation control unit that controls the operation of the heat source unit or the indoor unit with the upper limit of the limited heat exchange capability set in the capability setting unit.

Description

  The present invention relates to an air conditioner including a plurality of heat source devices and having a shut-off device that shuts off a refrigerant flow when the refrigerant leaks.

  A conventional air conditioner has a structure in which when a refrigerant leak occurs, the shut-off valve is closed and the operation is stopped, so that the refrigerant leak is minimized (see, for example, Patent Document 1). In Patent Document 1, a detection unit that detects refrigerant leakage, a concentration calculation unit that calculates the concentration of refrigerant leakage detected by the detection unit, and a refrigerant that circulates in the refrigeration cycle are shut off based on the output of the concentration detection unit. An air conditioner having a shut-off device is disclosed.

International Publication No. 2012/101673

  The air-conditioning apparatus of Patent Document 1 is controlled such that when refrigerant leakage occurs, the refrigerant flow is completely blocked and the operation is stopped. For this reason, the comfort of an air-conditioned space will be impaired by the leakage of a refrigerant | coolant.

  The present invention has been made to solve the above-described problems, and provides an air conditioner that can minimize deterioration in comfort of an air-conditioned space even when refrigerant leakage is blocked. The purpose is to do.

  The air conditioner of the present invention includes a compressor and a heat source side heat exchanger, and includes a plurality of heat source units connected in parallel to each other, and an indoor unit having a load side expansion device and a load side heat exchanger as refrigerant piping. A refrigerant circuit connected via a plurality of heat source units and an indoor unit, each of which is installed between a plurality of heat source units and an indoor unit. A plurality of leakage detectors for detecting each of them, and a control device for controlling the operation of the plurality of heat source units, indoor units, and shut-off device, and the controller detects the refrigerant leakage when the leakage detector detects the refrigerant leakage A shut-off controller that activates a shut-off device connected to a heat source machine that is leaking, and in a plurality of shut-off devices, when there are a shut-off device that is in an active state and a shut-off device that is in an inactive state, Connected to the shut-off device at A capacity setting unit for setting the limited heat exchange capacity in the indoor unit when operated by the unit, and an operation control unit for controlling the operation of the heat source unit or the indoor unit up to the limited heat exchange capacity set in the capacity setting unit With.

  According to the air conditioner of the present invention, when refrigerant leakage is detected, the shut-off device is operated, and the operation of the heat source unit is controlled with the limited heat exchange capability for blocking the refrigerant leak as the upper limit, Since the operation can be continued while minimizing the leakage of the refrigerant, the deterioration of the comfort of the air-conditioned space can be minimized even when the leakage of the refrigerant is interrupted.

It is a refrigerant circuit figure which shows Embodiment 1 of the air conditioning apparatus of this invention. It is a refrigerant circuit figure which shows the flow of the refrigerant | coolant at the time of the cooling only operation mode in the air conditioning apparatus of FIG. It is a refrigerant circuit diagram which shows the flow of the refrigerant | coolant at the time of the heating only operation mode in the air conditioning apparatus of FIG. It is a refrigerant circuit figure which shows the flow of the refrigerant | coolant at the time of the main cooling operation mode in the air conditioning apparatus of FIG. It is a refrigerant circuit figure which shows the flow of the refrigerant | coolant at the time of the main heating operation mode in the air conditioning apparatus of FIG. It is a block diagram which shows an example of the control apparatus in the air conditioning apparatus of FIG. 2 is a flowchart illustrating an example of setting a reference value in a first refrigerant amount determination mode in the air conditioner of FIG. 1. It is a refrigerant circuit figure which shows Embodiment 2 of the indoor unit of the air conditioning apparatus of this invention.

Embodiment 1. FIG.
Hereinafter, preferred embodiments of the air-conditioning apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a refrigerant circuit diagram showing Embodiment 1 of the air-conditioning apparatus of the present invention. The air conditioner 100 includes a plurality of heat source devices 1A and 1B, a relay device 20 connected to the plurality of heat source devices 1A and 1B via refrigerant pipes 4a and 4b, and a relay device 20 connected via the refrigerant pipe 5. And a plurality of indoor units 30a to 30d. The plurality of heat source units 1A and 1B, the relay device 20, and the plurality of indoor units 30a to 30d constitute a refrigerant circuit 100A connected by refrigerant pipes 4a, 4b, and 5, and the plurality of heat source units 1A and 1B. The cold heat or warm heat generated in the above is delivered to the plurality of indoor units 30a to 30d via the relay device 20. Examples of the refrigerant used in the air conditioner 100 include HFC refrigerants such as R410A, R407C, and R404A, HCFC refrigerants such as R22 and R134a, or natural refrigerants such as hydrocarbon and helium.

[Configuration of Heat Source Units 1A and 1B]
The plurality of heat source units 1 </ b> A and 1 </ b> B are arranged in a space outside a building such as a building or a house, for example, and supply cold or hot heat to the indoor units 30 a to 30 d via the relay device 20. The heat source units 1A and 1B are connected in parallel to each other, and each include a compressor 10, a first flow path switching device 11, a heat source side heat exchanger 12, and an accumulator 13. In addition, in FIG. 1, although the several heat source machine 1A, 1B has illustrated about the case where it has the same structure, you may have a different structure.

  The compressor 10 sucks in refrigerant, compresses it, and discharges it in a high temperature / high pressure state. The compressor 10 has a discharge side connected to the first flow path switching device 11 and a suction side connected to the accumulator 13. The compressor 10 may be composed of, for example, an inverter compressor capable of capacity control.

  The 1st flow-path switching apparatus 11 consists of a four-way valve etc., for example, and switches a refrigerant | coolant flow path according to an operation mode. The first flow path switching device 11 connects the discharge side of the compressor 10 and the check valve 14b in the heating operation mode and the heating main operation mode, and also at the suction side of the heat source side heat exchanger 12 and the accumulator 13. And connect. The first flow path switching device 11 connects the discharge side of the compressor 10 and the heat source side heat exchanger 12 in the cooling operation mode and the cooling main operation mode, and the suction side of the check valve 14d and the accumulator 13 And connect.

  The heat source side heat exchanger 12 is composed of, for example, a plate fin and tube heat exchanger that exchanges heat between the refrigerant flowing through the heat transfer tubes and the air passing through the fins. One of the heat source side heat exchangers 12 is connected to the first flow path switching device 11, and the other is connected to the refrigerant pipes 4a and 4b via check valves 14b and 14c. The heat source side heat exchanger 12 functions as an evaporator during heating operation, functions as a radiator (gas cooler) during cooling operation, and exchanges heat between air and refrigerant supplied from a blower such as a fan (not shown). I do.

  The accumulator 13 is connected to the suction side of the compressor 10, and surplus refrigerant due to the difference between the heating operation mode and the cooling operation mode, transitional operation changes (for example, the number of operating units of the indoor units 30 a to 30 d). The surplus refrigerant with respect to (change) is stored.

  Each of the heat source devices 1A and 1B has four check valves 14a to 14d that make the flow of refrigerant flowing from the heat source devices 1A and 1B to the relay device 20 in a certain direction in both the cooling operation mode and the heating operation mode. have. In the heating operation mode, the refrigerant flows out from the first flow path switching device 11 through the check valve 14a to the refrigerant pipe 4a, and from the refrigerant pipe 4b through the check valve 14b to the heat source side heat exchanger 12. Flows in. On the other hand, in the cooling operation mode, the refrigerant flows out from the heat source side heat exchanger 12 through the check valve 14c to the refrigerant pipe 4a, and flows from the refrigerant pipe 4b through the check valve 14d. Thus, the refrigerant pipe 4a functions as a high-pressure pipe, and the refrigerant pipe 4b functions as a low-pressure pipe.

[Relay device 20]
The relay device 20 is configured as a separate housing from the plurality of heat source units 1A and 1B and the plurality of indoor units 30a to 30d, and can be installed at a position different from the outdoor space and the indoor space. The relay device 20 is connected to the plurality of heat source units 1A and 1B via the refrigerant pipes 4a and 4b, and is connected to the indoor units 30a to 30d via the refrigerant pipe 5. And the relay apparatus 20 transmits the cold heat or warm heat supplied from the heat source machines 1A and 1B to the indoor units 30a to 30d. The relay device 20 includes a gas-liquid separator 21, a first throttle device 22, a second throttle device 23, and second flow path switching devices 24a to 24d.

  The gas-liquid separator 21 is installed at the entrance of the relay device 20, and is connected to the plurality of heat source units 1A and 1B via the refrigerant pipe 4a. The gas-liquid separator 21 separates the high-pressure gas-liquid two-phase refrigerant flowing out from the plurality of heat source units 1A, 1B into liquid refrigerant and gas refrigerant. A gas pipe is connected to the upper part of the gas-liquid separator 21 and a liquid pipe is connected to the lower part. The liquid refrigerant separated in the gas-liquid separator 21 flows from the lower liquid pipe to the indoor units 30a to 30d to supply cold heat, and the gas refrigerant flows from the upper gas pipe to the indoor units 30a to 30d to supply hot heat. .

  The first throttling device 22 functions as a pressure reducing valve and an on-off valve, and depressurizes the liquid refrigerant to adjust it to a predetermined pressure, and opens and closes the flow path of the liquid refrigerant. The first expansion device 22 is provided in a lower pipe through which liquid refrigerant flows from the gas-liquid separator 21. The first throttling device 22 may be constituted by a device whose opening degree can be variably controlled, for example, an electronic expansion valve.

  The second expansion device 23 functions as a pressure reducing valve and an on-off valve, and is installed between the low-pressure piping on the outlet side of the relay device 20 that leads to the refrigerant piping 4 b side and the piping that conducts to the outlet side of the first expansion device 22. ing. The second expansion device 23 opens and closes the refrigerant flow path when bypassing the refrigerant in the heating only operation mode. Moreover, the 2nd expansion device 23 adjusts a bypass flow volume according to load side load in heating main operation mode. The second expansion device 23 may also be configured with a device whose opening degree can be variably controlled, such as an electronic expansion valve.

  The second flow path switching devices 24a to 24d switch the flow path according to the operation mode of the plurality of indoor units 30a to 30d, and the number corresponding to the number of installed indoor units 30a to 30d (here, 4 One) is installed. The second flow path switching devices 24 a to 24 d are connected in parallel to the liquid pipe and the gas pipe of the gas-liquid separator 21, respectively, the two opening / closing devices 25 a and 25 b connected to one refrigerant pipe 5, and the other Two check valves 26 a and 26 b connected to the refrigerant pipe 5. In addition, although illustrated below is an example in which the second flow path switching devices 24a to 24d have two opening / closing devices 25a and 25b and two check valves 26a and 26b, they may be composed of, for example, a four-way valve or the like. Good.

  The opening / closing devices 25a and 25b are made of, for example, electromagnetic valves and are connected in parallel to each other. One side of the switchgears 25 a and 25 b is connected to the refrigerant pipe 5. The other side of the switchgear 25a is connected to the gas pipe of the gas-liquid separator 21, and the other side of the switchgear 25b is connected to the refrigerant pipe 4b. When the indoor units 30a to 30d are in the heating operation mode, the opening / closing device 25a side is opened, and the opening / closing device 25b side is closed. On the other hand, when the indoor units 30a to 30d are in the cooling operation mode, the opening / closing device 25b side is opened, and the opening / closing device 25a side is closed.

  One of the check valves 26 a and 26 b is connected to the refrigerant pipe 5, and the other is connected to the first expansion device 22 and the second expansion device 23. When the indoor units 30a to 30d are in the cooling operation mode, the refrigerant flows from the check valve 26a side into the indoor units 30a to 30d. On the other hand, when the indoor units 30 a to 30 d perform the heating operation, the refrigerant flows from the indoor units 30 a to 30 d to the check valve 26 b side and flows to the second expansion device 23.

[Indoor units 30a-30d]
The indoor units 30a to 30d are arranged at positions where cooling air or heating air can be supplied to an indoor space that is a space inside the building (for example, a living room), and cooling air or Heating air is supplied. In addition, in FIG. 1, although the case where four indoor units 30a-30d are connected is shown as an example, the number of connected indoor units 30a-30d is not limited to four, and one or more connected. It only has to be.

  Each of the indoor units 30a to 30d includes a load side heat exchanger 31 and a load side expansion device 32, respectively. The load-side heat exchanger 31 is connected to the second flow path switching devices 24 a to 24 d of the relay device 20 via the refrigerant pipe 5. The load-side heat exchanger 31 exchanges heat between air supplied from a blower such as a fan (not shown) and a refrigerant, and generates heating air or cooling air to be supplied to the indoor space. is there.

  The load-side throttle device 32 includes a device whose opening degree can be variably controlled, for example, an electronic expansion valve, etc., and decompresses and expands the refrigerant in the cooling operation mode and supplies the refrigerant to the load-side heat exchanger 31. . The opening degree of the load side throttle device 32 is controlled so that the superheat (superheat degree) obtained as a difference between the temperature detected by the first temperature sensor 43 and the second temperature sensor 44 is constant in the cooling operation mode. Is done.

  Here, the air conditioning apparatus 100 can perform a cooling operation or a heating operation with the indoor units 30a to 30d based on instructions from the indoor units 30a to 30d. That is, the air conditioner 100 can perform the same operation for all of the indoor units 30a to 30d, and can perform different operations for each of the indoor units 30a to 30d.

  The operation mode executed by the air conditioner 100 includes a cooling only operation mode in which all of the driven indoor units 30a to 30d execute a cooling operation, and all of the driven indoor units 30a to 30d execute a heating operation. There are a heating main operation mode, a cooling main operation mode as a cooling / heating mixed operation mode with a larger cooling load, and a heating main operation mode as a cooling / heating mixed operation mode with a larger heating load. Below, each operation mode is demonstrated with the flow of a heat source side refrigerant | coolant and a refrigerant | coolant.

  In the following description of the cooling only operation mode, the heating only operation mode, the cooling main operation mode, and the heating main operation mode, the case where the indoor units 30a and 30b operate is illustrated, and a cooling load is applied to the indoor units 30c and 30d. In this example, there is no need to flow the refrigerant, and the load side expansion device 32 corresponding to each state is closed. Then, when a cooling load is generated from the indoor units 30c and 30d, the load side expansion device 32 may be opened to circulate the refrigerant.

[Cooling operation mode]
FIG. 2 is a refrigerant circuit diagram illustrating a refrigerant flow when the air-conditioning apparatus of FIG. 1 is in the cooling only operation mode. In the cooling source operation mode, in the heat source units 1A and 1B, the first flow path switching device 11 is switched so that the heat source side refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12. First, a low temperature / low pressure refrigerant is compressed by the compressor 10 and discharged as a high temperature / high pressure gas refrigerant. The high-temperature and high-pressure gas refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12 via the first flow path switching device 11. And it becomes a high pressure liquid refrigerant, radiating heat to outdoor air with the heat source side heat exchanger 12. The high-pressure liquid refrigerant that has flowed out of the heat source side heat exchanger 12 flows out of the heat source devices 1A and 1B through the check valve 14c, and flows into the relay device 20 through the refrigerant pipe 4a. The high-pressure liquid refrigerant that has flowed into the relay device 20 passes through the gas-liquid separator 21, the first throttle device 22, the check valves 26a of the second flow path switching devices 24a and 24b, and the refrigerant pipe 5, and then the indoor unit 30a, Flows into 30b.

  In the indoor units 30a and 30b, the high-pressure liquid refrigerant is expanded by the load-side throttle device 32 to become a low-temperature and low-pressure gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant flows into the load-side heat exchanger 31 of the indoor units 30a and 30b acting as evaporators and absorbs heat from the room air, thereby cooling the room air and cooling the room air. become. The gas refrigerant that has flowed out of the indoor units 30a and 30b flows out of the relay device 20 via the refrigerant pipe 5 and the opening / closing device 25b of the second flow path switching devices 24a and 24b. And it flows in into heat source machine 1A, 1B again through low-pressure side refrigerant piping 4b. The refrigerant that has flowed into the heat source devices 1A and 1B passes through the check valve 14d, and is again sucked into the compressor 10 via the first flow path switching device 11 and the accumulator 13.

[Heating operation mode]
FIG. 3 is a refrigerant circuit diagram illustrating a refrigerant flow when the air-conditioning apparatus of FIG. 1 is in the heating only operation mode. In the heating only operation mode shown in FIG. 3, in the heat source units 1 </ b> A and 1 </ b> B, the first flow path switching device 11 causes the heat source side refrigerant discharged from the compressor 10 to pass through the heat source side heat exchanger 12. Without switching to the relay device 20. The low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant. The high-temperature and high-pressure gas refrigerant discharged from the compressor 10 passes through the first flow path switching device 11 and the check valve 14a and flows out from the heat source devices 1A and 1B. The high-temperature and high-pressure gas refrigerant flowing out from the heat source devices 1A and 1B flows into the relay device 20 through the refrigerant pipe 4a on the high-pressure refrigerant side. The high-temperature and high-pressure gas refrigerant flowing into the relay device 20 flows into the indoor units 30a and 30b after passing through the gas-liquid separator 21, the opening and closing device 25a of the second flow path switching devices 24a and 24b, and the refrigerant pipe 5. To do.

  In the indoor units 30a and 30b, the high-temperature and high-pressure gas refrigerant flows into the load-side heat exchanger 31 that acts as a condenser and dissipates heat to the indoor air, thereby turning into liquid refrigerant while heating the indoor space. The liquid refrigerant that has flowed out of the indoor units 30a and 30b is expanded by the load side throttle device 32, and again passes through the refrigerant pipe 5, the check valve 26b, the second throttle device 23, and the refrigerant pipe 4b, and the heat source machines 1A and 1B again. Flow into. The refrigerant flowing into each of the heat source units 1A and 1B passes through the check valve 14b and becomes a low-temperature / low-pressure gas refrigerant while absorbing heat from the outdoor air by the heat source side heat exchanger 12. Thereafter, the low-temperature and low-pressure gas refrigerant is again sucked into the compressor 10 via the first flow path switching device 11 and the accumulator 13.

[Cooling operation mode]
FIG. 4 is a refrigerant circuit diagram illustrating a refrigerant flow when the air-conditioning apparatus of FIG. 1 is in the cooling main operation mode. In addition, in FIG. 4, the case where the cooling load is generated in the indoor unit 30a and the heating load is generated in the indoor unit 30b is illustrated. In the cooling main operation mode shown in FIG. 4, the first flow path switching device 11 is switched so that the refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12. The low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant. The high-temperature and high-pressure gas refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12 via the first flow path switching device 11. The high-temperature and high-pressure gas refrigerant becomes a gas-liquid two-phase refrigerant while radiating heat to the outdoor air by the heat source side heat exchanger 12. The refrigerant that has flowed out of the heat source side heat exchanger 12 flows into the relay device 20 through the check valve 14c and the refrigerant pipe 4a. The two-phase refrigerant that has flowed into the relay device 20 is separated into a high-pressure gas refrigerant and a high-pressure liquid refrigerant by the gas-liquid separator 21. Among these, the high-pressure gas refrigerant flows into the indoor unit 30b after passing through the opening / closing device 25a and the refrigerant pipe 5 of the second flow path switching device 24b. And it flows into the load side heat exchanger 31 of the indoor unit 30b which acts as a condenser, and becomes a liquid refrigerant while heating the indoor space by dissipating heat to the indoor air.

  The liquid refrigerant flowing out from the load side heat exchanger 31 of the indoor unit 30b is expanded by the load side expansion device 32 and passes through the refrigerant pipe 5 and the check valve 26b. The liquid refrigerant that has passed through the check valve 26b merges with the intermediate-pressure liquid refrigerant that has been separated in the gas-liquid separator 21 and expanded in the second expansion device 23 to an intermediate pressure (for example, about high pressure -0.3 MPa). To do. The merged liquid refrigerant passes through the check valve 26a and the refrigerant pipe 5, and is then expanded by the load side expansion device 32 to become a low-temperature / low-pressure gas-liquid two-phase refrigerant. This two-phase refrigerant flows into the load-side heat exchanger 31 of the indoor unit 30a that functions as an evaporator, and absorbs heat from the room air, thereby becoming a low-temperature and low-pressure gas refrigerant while cooling the room air. The gas refrigerant that has flowed out of the load-side heat exchanger 31 flows out of the relay device 20 via the refrigerant pipe 5 and the opening / closing device 25b, and flows into the heat source devices 1A and 1B again through the refrigerant pipe 4b. The refrigerant that has flowed into each of the heat source devices 1A and 1B passes through the check valve 14d and is again sucked into the compressor 10 via the first flow path switching device 11 and the accumulator 13.

[Heating main operation mode]
FIG. 5 is a refrigerant circuit diagram illustrating a refrigerant flow when the air-conditioning apparatus of FIG. 1 is in the heating main operation mode. FIG. 5 illustrates a case where a cooling load is generated in the indoor unit 30a and a heating load is generated in the indoor unit 30b. In the heating main operation mode shown in FIG. 5, in the heat source units 1 </ b> A and 1 </ b> B, the first flow path switching device 11 relays the heat source side refrigerant discharged from the compressor 10 without passing through the heat source side heat exchanger 12. It is switched to flow into the device 20. The low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant. The high-temperature and high-pressure gas refrigerant discharged from the compressor 10 passes through the first flow path switching device 11 and the check valve 14a and flows out from the heat source devices 1A and 1B. The high-temperature and high-pressure gas refrigerant that has flowed out of the heat source devices 1A and 1B flows into the relay device 20 through the refrigerant pipe 4a on the high-pressure refrigerant side. The high-temperature and high-pressure gas refrigerant that has flowed into the relay device 20 flows into the indoor unit 30b after passing through the gas-liquid separator 21, the opening / closing device 25a of the second flow path switching device 24b, and the refrigerant pipe 5. The high-temperature and high-pressure gas refrigerant flows into the load-side heat exchanger 31 of the indoor unit 30b that acts as a condenser and dissipates heat to the indoor air, thereby turning into a liquid refrigerant while heating the indoor space.

  The liquid refrigerant that has flowed out of the load side heat exchanger 31 of the indoor unit 30b is expanded by the load side expansion device 32, and passes through the check pipe 26b on the refrigerant pipe 5 and the second flow path switching device 24b side, A branch is made to a check valve 26a on the second flow path switching device 24a side and a second expansion device 23 used as a bypass. The liquid refrigerant that has flowed into the check valve 26 a flows into the indoor unit 30 a after passing through the refrigerant pipe 5.

  Thereafter, the liquid refrigerant is expanded by the load side expansion device 32 to become a low-temperature / low-pressure two-phase refrigerant. This two-phase refrigerant flows into the load-side heat exchanger 31 acting as an evaporator and absorbs heat from the room air, so that it becomes a low-temperature and low-pressure gas refrigerant while cooling the room air. The gas refrigerant flowing out from the load-side heat exchanger 31 passes through the refrigerant pipe 5 and the opening / closing device 25a, and then merges with the liquid refrigerant bypassed at the outlet of the second expansion device 23 and flows out from the relay device 20. The merged refrigerant flows into the heat source units 1A and 1B again through the refrigerant pipe 4b, passes through the check valve 14b, absorbs heat from the outdoor air in the heat source side heat exchanger 12, and is cooled at low temperature and low pressure. become. Then, the low-temperature and low-pressure gas refrigerant is again sucked into the compressor 10 via the first flow path switching device 11 and the accumulator 13.

  Control of each operation mode mentioned above and control of refrigerant circuit 100A are performed by control device 50. The control device 50 is constituted by a microcomputer or the like, and controls the operation of the entire device based on detection information from various sensors and instructions from a remote controller. In addition, although the control apparatus 50 has illustrated about the case where it is provided in 1 A of heat source units, you may be provided in the indoor unit 30a-30d side, heat source unit 1A, 1B, or indoor unit 30a-30d. May be provided separately.

  Here, the air conditioner 100 includes a first pressure sensor 41 that detects the pressure of the refrigerant flowing between the gas-liquid separator 21 and the first throttling device 22, and the pressure of the refrigerant that has passed through the first throttling device 22. The second pressure sensor 42 to be detected, the first temperature sensor 43 provided between the load side heat exchanger 31 and the load side expansion device 32, the load side heat exchanger 31 and the second flow path switching devices 24a to 24a. And a second temperature sensor 44 provided between the second temperature sensor 24d and an indoor temperature sensor 45 that detects the temperature of the indoor air that is an air conditioning load. The first pressure sensor 41, the first temperature sensor 43, and the second temperature sensor 44 function as a refrigerant temperature sensor that detects the temperature of the refrigerant flowing through the load-side heat exchanger 31.

  The controller 50 controls the first pressure so that the pressure difference between the pressure detected by the first pressure sensor 41 and the pressure detected by the second pressure sensor 42 becomes a predetermined pressure difference (for example, 0.3 MPa). The operation of the diaphragm device 22 is controlled. Further, the control device 50 determines the difference between the value detected by the first pressure sensor 41 and the temperature detected by the first temperature sensor 43 during the heating operation of the indoor units 30a to 30d. The opening degree of the load side throttle device 32 is controlled so that the obtained subcool (supercooling degree) is constant. The control device 50 has a constant superheat (superheat degree) obtained as a difference between the temperature detected by the first temperature sensor 43 and the temperature detected by the second temperature sensor 44 during the cooling operation of the indoor units 30a to 30d. The opening degree of the load side expansion device 32 is controlled so that

  Here, the air conditioner 100 is installed between the plurality of heat source units 1A and 1B and the indoor units 30a to 30d, respectively, and a plurality of blocking devices 6a that block the flow of the refrigerant flowing through the refrigerant pipes 4a and 4b, 6b, 7a, 7b. The shutoff devices 6a and 7a are respectively provided in the refrigerant pipes 4a and 4b that connect the heat source device 1A and the relay device 20, and the shutoff devices 6b and 6b are connected to the refrigerant pipes 4a and 4b that connect the heat source device 1B and the relay device 20, respectively. 7b is provided. The shut-off devices 6a, 6b, 7a, and 7b are composed of, for example, two-way valves, and are opened when power is supplied and closed when power supply is stopped.

  The opening / closing operation of the shut-off devices 6a, 6b, 7a, 7b is controlled by the control device 50. When the refrigerant leaks to the heat source unit 1A, the shut-off devices 6a, 7a are closed and the heat source unit 1B When leakage occurs, the shut-off devices 6b and 7b are closed. The air conditioner 100 is installed in each of the heat source devices 1A and 1B, and has a leak detection unit 46 that detects refrigerant leak. The control device 50 is based on the detection result in the leak detection unit 46, and the shut-off device 6a, 6b, 7a and 7b are controlled.

  FIG. 6 is a functional block diagram illustrating an example of a control device in the air-conditioning apparatus of FIG. 1 and 6, the leak detection unit 46 calculates the refrigerant concentration based on the concentration detection unit 46a having a detection member whose resistance value changes according to the refrigerant concentration and the resistance value of the concentration detection unit 46a. A leakage determination unit 46b.

  The leakage determination unit 46b calculates the concentration of the refrigerant based on the resistance value of the detection member of the concentration detection unit 46a, and determines whether or not the refrigerant is leaking. The leakage determination unit 46b stores the relationship between the resistance value of the detection member of the concentration detection unit 46a and the refrigerant concentration, and the leakage determination unit 46b calculates the refrigerant concentration based on the resistance value of the concentration detection unit 46a. In addition, a predetermined concentration value is set in advance in the leakage determination unit 46b, and the leakage determination unit 46b determines that the refrigerant is not leaking when the refrigerant concentration is less than the predetermined concentration value. On the other hand, the leak determination unit 46b determines that a refrigerant leak has occurred when the refrigerant concentration is equal to or higher than a predetermined concentration. The predetermined concentration corresponds to the refrigerant leakage limit concentration or explosion limit lower limit value employed in the air conditioner 100. For example, the predetermined concentration when carbon dioxide is used as the refrigerant is preferably set to about 1/10 of the leakage limit concentration.

  Here, even if any one of the plurality of heat source units 1A and 1B is in a state where it cannot be used, if there is a heat source unit in which the shut-off device is in an inoperative state, the operation of the air conditioner 100 is performed. It can be carried out. Using this, the control device 50 controls the operation to be continued if the refrigerant circuit 100A can be operated even when some of the shut-off devices are activated. However, the refrigerant leakage is occurring and a part of the refrigerant circuit is blocked by the blocking device. For this reason, the refrigerant | coolant flow rate which circulates through the refrigerant circuit 100A decreases compared with the normal time, and the maximum capacity of the entire air conditioner 100 is lowered. If operation is performed at the maximum capacity under normal conditions in this state, it may cause an abnormal stop. Therefore, the capacity setting unit 53 has a function of setting the upper limit value of the capacity when the shut-off device is activated as the limited heat exchange capacity.

  Specifically, the control device 50 includes a cutoff control unit 51, an operation control unit 52, and a capacity setting unit 53. When the leakage detection unit 46 determines that the refrigerant is leaking, the blocking control unit 51 closes the blocking devices 6a, 7a and 6b, 7b to block the refrigerant flow. Thereby, the quantity which a refrigerant | coolant leaks can be reduced and the safety | security of the air conditioning apparatus 100 can be improved. The shut-off control unit 51 operates the shut-off device on the side of the heat source unit that has been determined that the refrigerant has leaked, and the shut-off device on the side of the heat source unit that has not leaked the refrigerant remains in an inactive state. To do.

  The operation control unit 52 controls the operation of the refrigerant circuit 100A. For example, the driving frequency of the compressor 10, the rotational speed (including ON / OFF) of the blower (not shown), and switching of the first flow path switching device 11 are performed. The opening degree of the first throttle device 22 and the second throttle device 23, the switching of the second flow path switching devices 24a to 24d, the opening degree of the load side throttle device 32, and the like are controlled. Further, the operation control unit 52 has a function of controlling switching of the various operation modes described above.

  Further, the operation control unit 52 is within the range of the limited heat exchange capacity Qe1 and Qc1 even in a state where the flow of the refrigerant to any one of the heat source devices 1A and 1B is interrupted. Drive in. For example, the operation control unit 52 controls the maximum number of the indoor units 30a to 30d by reducing the number of the indoor units 30a to 30d, or reducing the indoor fan air volume or the upper limit of the operating frequency of the compressor 10. Suppress ability. The operation control unit 52 stops the operation when all the shut-off devices 6a, 6b, 7a, and 7b are in the operating state.

  The capacity setting unit 53 sets the limited heat exchange capacities Qe1 and Qc1 when driving by operating the heat source apparatus in which the shut-off device is in the non-operating state when the shut-off device is in the non-operating state. Is. Here, when the capacity setting unit 53 sets the limited heat exchange capacities Qe1 and Qc1, for example, when the shut-off devices 6a and 7a on the side of the heat source unit 1A are activated, the capacity setting unit 53 is not in the shut-off device 6b in the inoperative state , 7b, the limited heat exchange capacities Qe1 and Qc1 when the operation is continued by the heat source device 1B connected to 7b are set.

  Here, when the capacity setting unit 53 sets the limited heat exchange capacities Qe1 and Qc1, the above-described operation control unit 52 performs a refrigerant state confirmation operation for controlling the compressor 10 to be driven at the set rotational speed. . Furthermore, the operation control unit 52 controls the refrigerant flow path to execute both the cooling only operation mode and the heating only operation mode during the refrigerant state confirmation operation. Then, the capacity setting unit 53 calculates a limited heat exchange capacity Qe1 during cooling operation and a limited heat exchange capacity Qc1 during heating operation when the heat source unit 1A is shut off.

  Here, the capacity setting unit 53 calculates the heat exchange temperature differences ΔTe1 and ΔTc1 during the refrigerant state check operation, and the limited heat exchange capacity Qe1 and Qc1 based on the heat exchange temperature differences ΔTe1 and ΔTc1. An ability calculating unit 53b to calculate and a storage unit 53c are provided. The temperature difference calculation unit 53a acquires the refrigerant temperature Te1 detected by the first temperature sensor 43 and the air temperature Tair1 detected by the indoor temperature sensor 45 in the cooling only operation mode of the refrigerant state confirmation operation. And the temperature difference calculation part 53a calculates heat exchange temperature difference (DELTA) Te1 of the load side heat exchanger 31 (evaporator) based on following formula (1).

              ΔTe1 = Tair1-Te1 (1)

  Further, the temperature difference calculation unit 53a is detected by the refrigerant temperature Tc1 obtained by converting the pressure detected by the first pressure sensor 41 into the saturation temperature and the indoor temperature sensor 45 in the heating only operation mode of the refrigerant state confirmation operation. The air temperature Tair1 is acquired. And the temperature difference calculation part 53a calculates heat exchange temperature difference (DELTA) Tc1 of the load side heat exchanger 31 (condenser) based on following formula (2).

              ΔTc1 = Tc1−Tair1 (2)

  In addition, when several indoor unit 30a-30d is installed, heat exchange temperature difference (DELTA) Te1, (DELTA) Tc1 is calculated for every indoor unit 30a-30d, for example, an average value etc. are used.

  The capacity calculator 53b sets the limited heat exchange capacities Qe1 and Qc1 based on the heat exchange temperature differences ΔTe1 and ΔTc1 calculated by the temperature difference calculator 53a. Here, in the storage unit 53c, a set evaporator capacity Qestd during cooling operation and a set condenser capacity Qcstd during heating operation are stored in advance as set heat exchange capacities. The set evaporator capacity Qestd and the set condenser capacity Qcstd are determined by the total capacity of the indoor units 30a to 30d connected to the heat source units 1A and 1B.

  Furthermore, the storage unit 53c stores initial heat exchange temperature differences ΔTe0 and ΔTc0 during a trial operation or an initial refrigerant state confirmation operation. Note that the operation control unit 52 also performs the refrigerant state confirmation operation when the initial refrigerant state confirmation signal is received by a trial operation at the time of installation of the air conditioning apparatus 100 or a button operation. The initial heat exchange temperature differences ΔTe0 and ΔTc0 are calculated in the same manner as described above during the initial refrigerant state confirmation operation such as during a test operation.

  That is, the temperature difference calculation unit 53a is configured to detect the initial refrigerant temperature Te0 detected by the first temperature sensor 43 and the initial air temperature Tair0 detected by the indoor temperature sensor 45 in the initial cooling operation mode of the refrigerant state confirmation operation. Based on the above, the initial heat exchange temperature difference ΔTe0 is calculated based on the following equation (3). Then, the temperature difference calculation unit 53a stores the initial heat exchange temperature difference ΔTe0 in the storage unit 53c.

              ΔTe0 = Tair0−Te0 (3)

  In addition, the temperature difference calculation unit 53a uses the initial refrigerant temperature Tc0 obtained by converting the pressure detected by the first pressure sensor 41 into the saturation temperature and the indoor temperature sensor 45 in the cooling only operation mode of the initial refrigerant state confirmation operation. Based on the detected initial air temperature Tair0, an initial heat exchange temperature difference ΔTc0 is calculated based on the following equation (4).

              ΔTc1 = Tc1−Tair1 (4)

  As described above, by storing the initial heat exchange temperature differences ΔTe0 and ΔTc0 obtained in actual operation in the storage unit 53c, it is possible to set the limiting capacity according to the installation location and the installation state.

  The capacity calculator 53b calculates the limited heat exchange capacity Qe1 during the cooling operation from the ratio (ΔTe1 / ΔTe0) of the heat exchange temperature difference based on the following formula (5).

        Qe1 = Qestd × (ΔTe1 / ΔTe0) (5)

  Moreover, the capacity | capacitance calculating part 53b calculates the restriction | limiting heat exchange capacity | capacitance Qc1 at the time of heating operation from the ratio ((DELTA) Tc1 / (DELTA) Tc0) of heat exchange temperature based on following formula (6).

        Qc1 = Qcstd × (ΔTc1 / ΔTc0) (6)

  Then, after the limited heat exchange capabilities Qe1 and Qc1 are set in the capacity setting unit 53, the operation control unit 52 cancels the refrigerant state confirmation operation, and within the range of the limited heat exchange capabilities Qe1 and Qc1, the cooling operation mode or Perform heating operation mode. For example, the operation control unit 52 controls the maximum number of the indoor units 30a to 30d by reducing the number of the indoor units 30a to 30d, or reducing the indoor fan air volume or the upper limit of the operating frequency of the compressor 10. Suppress ability.

  FIG. 7 is a flowchart showing an operation example of the air conditioner of FIG. 1, and an operation example of the air conditioner will be described with reference to FIGS. In FIG. 7, it is assumed that initial heat exchange temperature differences ΔTe0 and ΔTc0 are stored in the storage unit 53c in the storage unit 53c in the initial refrigerant state confirmation operation. First, after the operation of the air conditioning apparatus 100 is started, it is determined in the leakage detection unit 46 whether or not the refrigerant is leaking (step ST1). And in the leak detection part 46, when it determines with the leakage of the refrigerant | coolant having generate | occur | produced on the heat source machine 1A side, for example (YES of step ST1), the interruption | blocking control part 51 cuts off the interruption | blocking apparatus 6a, 7a by the side of the heat source machine 1A. (Step ST2).

  Thereafter, it is determined in the operation control unit 52 whether or not there are shut-off devices 6b and 7b in the inoperative state (step ST3), and it is determined whether or not the operation can be continued. When all the shut-off devices 6a, 6b, 7a, 7b are operating, the operation of the devices is stopped (NO in step ST3). On the other hand, when there are shut-off devices 6b and 7b in the inoperative state (YES in step ST3), the operation control unit 52 starts the refrigerant state confirmation operation (step ST4) and the capacity setting unit 53 performs heat exchange during the cooling only operation. A temperature difference ΔTe1 and a heat exchange temperature difference ΔTc1 during the heating only operation are calculated (steps ST5 and ST6). Note that either of the heat exchange temperature differences ΔTe1 and ΔTc1 may be calculated first.

  Then, limited heat exchange capacities Qe1 and Qc1 during the cooling operation and the heating operation are calculated in the capacity calculation unit 53b (step ST7). Thereafter, the refrigerant state confirmation operation is canceled, and the cooling operation or the heating operation is performed in a state in which the capacities are set such that the limited heat exchange capacities Qe1 and Qc1 are the upper limit (step ST8).

  According to the first embodiment, the refrigerant circuit in which leakage occurs at the time of refrigerant leakage can be shut off, and the operation of the heat source machine without refrigerant leakage can be continued. At this time, an operation is performed with upper limits of the limited heat exchange capacities Qe1 and Qc1 calculated by the capacity setting unit 53 so as to be lower than the normal capacity. For this reason, the occurrence of an abnormal stop caused by the shortage of refrigerant can be prevented and the operation can be continued reliably.

  Further, when the capacity setting unit 53 calculates the limited heat exchange capacities Qe1 and Qc1, the operation control unit 52 controls the refrigerant circuit 100A so as to execute a refrigerant state confirmation operation in which the compressor 10 is driven at a specified rotational speed. The capacity setting unit 53 includes a storage unit 53c that stores the set heat exchange capacities Qestd and Qcstd of the indoor units 30a to 30d, and depends on the state of the load-side heat exchanger 31 during the refrigerant state confirmation operation. A limited heat exchange capacity lower than the set heat exchange capacity Qestd, Qcstd is set. As a result, the limited heat exchange capacities Qe1 and Qc1 can be accurately set based on the actual refrigerant amount after the shut-off devices 6a, 6b, 7a and 7b are activated.

  Further, the capacity setting unit 53 is calculated by the temperature difference calculation unit 53a that calculates the heat exchange temperature differences ΔTc1 and ΔTe1 between the refrigerant temperatures Tc1 and Te1 and the air temperature Tair1 during the refrigerant state confirmation operation, and the temperature difference calculation unit 53a. The ratio between the heat exchange temperature differences ΔTc1 and ΔTe1 and the initial heat exchange temperature differences ΔTc0 and ΔTe0 stored in the storage unit 53c is multiplied by the set evaporator capacity Qestd and the set condenser capacity Qcstd, which are set heat exchange capacity. And an ability calculating unit 53b for calculating the exchange capacities Qe1 and Qc1. As a result, the limited heat exchange capacities Qe1 and Qc1 can be accurately set based on the actual refrigerant amount after the shut-off devices 6a, 6b, 7a and 7b are activated.

  At this time, the storage unit 53c is configured so that the initial refrigerant temperature Tc0, Te0 detected by the first pressure sensor 41 or the first temperature sensor 43, which is a refrigerant temperature sensor, and the initial air detected by the indoor temperature sensor 45 are installed. By storing the initial heat exchange temperature differences ΔTc0 and ΔTe0 with respect to the temperature Tair0, it is possible to set the limited heat exchange capacities Qe1 and Qc1 that match the installation location or installation situation.

  Each of the heat source devices 1A and 1B includes a flow path switching device that switches a refrigerant flow path between the cooling operation and the heating operation, and the capacity setting unit 53 sets the limited heat exchange capacities Qc1 and Qe1 during the cooling operation and the heating operation, respectively. If it is set, when the refrigerant leaks, both the cooling operation and the heating operation can be continued.

  In addition, the leak detection unit 46 is installed in the plurality of heat source units 1A and 1B, and the concentration detection unit 46a that detects the leaked refrigerant concentration of the leaked refrigerant, and the leaked refrigerant concentration detected by the concentration detection unit 46a is equal to or greater than a set threshold value. In this case, when it has the leakage determination unit 46b that determines that the refrigerant is leaking, it is possible to accurately detect the leakage of the refrigerant.

Embodiment 2. FIG.
FIG. 8 is a refrigerant circuit diagram showing Embodiment 2 of the air-conditioning apparatus according to Embodiment of the present invention. In addition, in the air conditioning apparatus 200 of FIG. 8, the same code | symbol is attached | subjected to the site | part which has the same structure as the air conditioning apparatus 100 of FIG. The air conditioner 200 of FIG. 8 is different from the air conditioner 100 of FIG. 1 in that the plurality of heat source devices 1A and 1B and the plurality of indoor units 30a to 30d are directly connected without the relay device 20. is there.

  Here, the air conditioning apparatus 200 in FIG. 8 includes a discharge pressure sensor 241 that is provided on the discharge side of the compressor 10 and detects the discharge pressure of the refrigerant discharged from the compressor 10. Then, the temperature difference calculation unit 53a of the control device 50 uses the initial refrigerant temperature Tc0 and the refrigerant temperature Tc1 obtained by converting the pressure detected by the discharge pressure sensor 241 into the saturation temperature, and the initial heat exchange temperature difference ΔTc0 and the heat exchange temperature. The difference ΔTc1 is calculated.

  Even in the case of the second embodiment, as in the first embodiment, the refrigerant circuit in which leakage occurs at the time of refrigerant leakage is shut off, and the operation of the heat source machine without refrigerant leakage is abnormally stopped. Can continue without.

  The embodiment of the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the said embodiment, although illustrated about the case where it has several indoor units 30a-30d, the one or more indoor units 30a should just be connected. Furthermore, although the second flow path switching devices 24a to 24d have been described by way of example as being built in the relay device 20, they may be built on the indoor units 30a to 30d side. Moreover, although the air conditioning apparatus 100 has been described as being capable of performing a cooling / heating mixed operation, the air conditioning apparatus 100 may be configured to perform only a cooling operation or a heating operation.

  Furthermore, generally, the heat source side heat exchanger 12 and the load side heat exchanger 31 are provided with a blower, and in many cases, condensation or evaporation is promoted by blowing air, but this is not restrictive. For example, the load-side heat exchanger 31 can be a panel heater using radiation, and the heat source-side heat exchanger 12 is a water-cooled type that moves heat by water or antifreeze. Can also be used. That is, the heat source side heat exchanger 12 and the load side heat exchanger 31 can be used regardless of the type as long as they have a structure capable of radiating heat or absorbing heat.

  Moreover, although the case where the leak detection part 46 is arrange | positioned at the heat-source equipment 1A and 1B side is illustrated, you may arrange | position at the indoor units 30a-30d side. Thereby, it is possible to cope with refrigerant leakage of the indoor units 30a to 30d. In this case, a shut-off device may be arranged on the refrigerant pipe 5 side in FIG.

  Moreover, although the refrigerant | coolant leak detection part has illustrated about the case where it determines based on the refrigerant | coolant density | concentration detected in the leak detection part 46, if it detects the leak of a refrigerant | coolant, it will not be limited to this. Furthermore, in the said embodiment, although the capacity | capacitance setting part 53 has illustrated about the case where the limiting heat exchange capability Qe1 and Qc1 are set based on heat exchange temperature difference (DELTA) Tc1 and (DELTA) Te1, set heat exchange capability Qestd at the time of installation, Any method may be used as long as it sets limited heat exchange capacities Qe1 and Qc1 lower than Qcstd. For example, the storage unit 53c stores in advance the limited heat exchange capacities Qe1 and Qc1 when each shut-off device is activated, and the limited heat exchange capacities Qe1 and Qc1 stored in the storage unit 53c when the shut-off device is activated. You may make it set.

  1A, 1B Heat source unit 4a, 4b Refrigerant piping, 5 Refrigerant piping, 6a, 6b, 7a, 7b Shut-off device, 10 Compressor, 11 First flow switching device, 12 Heat source side heat exchanger, 13 Accumulator, 14a- 14d check valve, 20 relay device, 21 gas-liquid separator, 22 first throttling device, 23 second throttling device, 24a to 24d second flow path switching device, 25a, 25b open / close device, 26a, 26b check valve, 30a to 30d indoor unit, 31 load side heat exchanger, 32 load side expansion device, 41 first pressure sensor, 42 second pressure sensor, 43 first temperature sensor, 44 second temperature sensor, 45 indoor temperature sensor, 46 leakage Detection unit, 46a Concentration detection unit, 46b Leakage determination unit, 50 control device, 51 Shutdown control unit, 52 Operation control unit, 53 Capacity setting unit, 53a Temperature difference calculation Part, 53b capacity calculation part, 53c storage part, 100, 200 air conditioner, 100A refrigerant circuit, 241 discharge pressure sensor, Qcstd set heat exchange capacity, Qc1 limited heat exchange capacity, Qcstd condenser capacity, Qe1 limited heat exchange capacity, Qestd Evaporator capacity, Tair0 initial air temperature, Tair1 air temperature, Tc0 initial refrigerant temperature, Tc1 refrigerant temperature, Te0 initial refrigerant temperature, Te1 refrigerant temperature, ΔTc0 initial heat exchange temperature difference, ΔTc1 heat exchange temperature difference, ΔTe0 initial heat exchange temperature Difference, ΔTe1 Heat exchange temperature difference.

The air conditioner of the present invention includes a compressor and a heat source side heat exchanger, and includes a plurality of heat source units connected in parallel to each other, and an indoor unit having a load side expansion device and a load side heat exchanger as refrigerant piping. A refrigerant circuit connected via a plurality of heat source units and an indoor unit, each of which is installed between a plurality of heat source units and an indoor unit. A plurality of leakage detectors for detecting each of them, and a control device for controlling the operation of the plurality of heat source units, indoor units, and shut-off device, and the controller detects the refrigerant leakage when the leakage detector detects the refrigerant leakage A shut-off controller that activates a shut-off device connected to a heat source machine that is leaking, and in a plurality of shut-off devices, when there are a shut-off device that is in an active state and a shut-off device that is in an inactive state, Connected to the shut-off device at A capacity setting unit for setting the limited heat exchange capacity in the indoor unit when operated by the unit, and an operation control unit for controlling the operation of the heat source unit or the indoor unit up to the limited heat exchange capacity set in the capacity setting unit And the operation control unit controls the refrigerant circuit so as to execute a refrigerant state confirmation operation in which the compressor is driven at the specified rotational speed when the capacity setting unit calculates the limited heat exchange capacity. The setting unit has a storage unit that stores the set heat exchange capacity of the indoor unit, and sets a limited heat exchange capacity lower than the set heat exchange capacity according to the state of the load-side heat exchanger during the refrigerant state confirmation operation To do .

Claims (5)

A refrigerant circuit having a compressor and a heat source side heat exchanger and connecting a plurality of heat source units connected in parallel to each other and an indoor unit having a load side expansion device and a load side heat exchanger via a refrigerant pipe; ,
A plurality of shut-off devices that are installed between the plurality of heat source units and the indoor unit and block the flow of the refrigerant flowing through the refrigerant pipe;
A plurality of leakage detectors for respectively detecting refrigerant leakage from each of the heat source units;
A plurality of the heat source units, the indoor unit, and a control device that controls operations of the shut-off device
The controller is
A shut-off control unit that activates the shut-off device connected to the heat source machine in which the refrigerant is leaked when the leak of the refrigerant is detected in the leak detection unit;
In the plurality of shut-off devices, when the shut-off device in the activated state and the shut-off device in the non-actuated state exist, when the operation by the heat source device connected to the shut-off device in the non-actuated state is performed A capacity setting unit for setting a limited heat exchange capacity in the indoor unit,
An air conditioner comprising: an operation control unit that controls the operation of the heat source unit or the indoor unit with the limited heat exchange capability set in the capability setting unit as an upper limit. The operation control unit controls the refrigerant circuit to execute a refrigerant state confirmation operation in which the compressor is driven at a specified rotational speed when the capacity setting unit calculates a limited heat exchange capacity.
The capacity setting unit has a storage unit that stores the set heat exchange capacity of the indoor unit, and is lower than the set heat exchange capacity depending on the state of the load-side heat exchanger during the refrigerant state confirmation operation. The air conditioning apparatus according to claim 1, wherein a heat exchange capacity is set. An indoor temperature sensor that detects the air temperature in the air conditioning load space;
A refrigerant temperature sensor for detecting a refrigerant temperature flowing into the load side heat exchanger;
With
The storage unit stores an initial heat exchange temperature difference between an initial refrigerant temperature detected by the refrigerant temperature sensor and an initial air temperature detected by the indoor temperature sensor at the time of installation,
The capability setting unit
A temperature difference calculation unit that calculates a heat exchange temperature difference between the refrigerant temperature and the air temperature during the refrigerant state confirmation operation;
Capability calculation for calculating the limited heat exchange capability by multiplying the set heat exchange capability by the ratio of the heat exchange temperature difference calculated in the temperature difference calculation unit and the initial heat exchange temperature difference stored in the storage unit The air conditioning apparatus according to claim 2, further comprising: Each of the heat source units includes a flow path switching device that switches a refrigerant flow path in a cooling operation and a heating operation.
The air conditioner according to any one of claims 1 to 3, wherein the capacity setting unit sets the limited heat exchange capacity during cooling operation and heating operation, respectively. The leak detector is
A concentration detector that is installed in the plurality of heat source units and detects a leaked refrigerant concentration of the leaked refrigerant;
The air conditioner according to any one of claims 1 to 4, further comprising: a leakage determination unit that determines that the refrigerant is leaking when the leaked refrigerant concentration detected by the concentration detection unit is greater than or equal to a set threshold value. .

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