JP6407522B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner having a function of stopping the operation of an air conditioner in an emergency such as a disaster or a refrigerant leak.

  Conventional air conditioners operate immediately after an emergency stop such as a disaster such as an earthquake or fire, or when a refrigerant leaks, based on input signals from external devices or unit built-in devices. Had an emergency stop function to stop.

  On the other hand, when an emergency stop situation as described above occurs, the solenoid valve or electronic expansion valve provided on the high-pressure liquid piping side of the refrigerant circuit is closed, and the refrigerant on the indoor unit side is operated by operating the refrigeration cycle in the cooling cycle. Is moved to the outdoor unit side, and when the low pressure drops below the set pressure, the solenoid valve provided on the low pressure gas pipe side is closed or the four-way switching valve is kept in the cooling position, so that the refrigerant is moved to the outdoor unit side. Are provided in the outdoor heat exchanger or the like to prevent the refrigerant from flowing out into the room (see Patent Documents 1 to 3).

JP 2000-28238 A JP 2000-274847 A Japanese Patent No. 3530983

  However, as shown in Patent Documents 1 to 3, when an emergency stop situation occurs, the refrigerant on the indoor unit side is moved to the outdoor unit side and stored, so that the solenoid valve is controlled to open and close in the refrigerant circuit at the time of emergency stop. In the case where the solenoid valve is configured to be opened and closed via a control device when an emergency stop situation occurs, an air conditioner having a specification with an emergency stop control function and an air specification not having It was not possible to arbitrarily select and use a harmony machine as needed.

  For this reason, it is indispensable to produce in advance two types of air conditioners with different specifications as described above, so that any one of the air conditioners with the specifications can be selected and used as necessary. Thus, there are problems such as a decrease in production efficiency and a complicated product management.

  The present invention has been made in view of such circumstances, and is configured to be able to add an emergency stop control function as an option, an air conditioner having an emergency stop control function, and an air conditioner not equipped An object of the present invention is to provide an air conditioner that can simplify the selection.

In order to solve the above-described problems, the air conditioner of the present invention employs the following means.
That is, the air conditioner according to the present invention is an air conditioner in which at least one indoor unit is connected to one outdoor unit provided with an outdoor control device via a crossover gas pipe and a crossover liquid pipe. In the machine, provided in the refrigerant circuit on the outdoor unit side, provided in the transition gas pipe, a gas side operation valve connected to the transition gas pipe, a liquid side operation valve connected to the transition liquid pipe, A gas-side stop valve located in the vicinity of the gas-side operation valve; a liquid-side stop valve provided in the transition liquid pipe; and located in the vicinity of the liquid-side operation valve; provided in the outdoor control device; comprising an output terminal for outputting a closing signal to the side stop valve and the liquid-side shutoff valve, and the the outdoor controller, straight emergency stop function to stop immediately the operation of the air conditioner based on an emergency stop signal And before Closing the liquid-side shut-off valve on the basis of the emergency stop signal, the mobile is continuously operated as a cooling cycle, when the low pressure reaches the set pressure, closes the gas side closing valve, the refrigerant in the outdoor unit side An emergency stop control function for stopping the operation of the air conditioner after the operation, and the outdoor unit further includes a changeover switch capable of switching between the direct emergency stop function and the emergency stop control function. It is characterized in that is.

According to the present invention, there is an air conditioner in which an indoor unit is connected to an outdoor unit via a crossover gas pipe and a crossover liquid pipe, and the outdoor unit side is connected to the crossover gas pipe and the crossover liquid pipe. In the vicinity of the gas side operation valve and the liquid side operation valve provided in the refrigerant circuit, the transition gas pipe and the transition liquid pipe are provided with a gas side stop valve and a liquid side stop valve, and the outdoor control device is based on the emergency stop signal. The liquid side shut-off valve is closed and the operation is continued as a cooling cycle.When the low pressure reaches the set pressure, the gas-side shut-off valve is closed and the air conditioner is stopped. Output terminal that outputs a closing signal to the side stop valve and the liquid side stop valve. Yu A gas side stop valve and a liquid side stop valve are provided in the transition gas pipe and the transition liquid pipe connected to the gas side operation valve and the liquid side operation valve on the water side, and the gas side stop valve and the liquid side stop valve are controlled outdoors. While it can be installed as an air conditioner with an emergency stop control function by electrically connecting to the output terminal of the device and enabling the gas side stop valve and the liquid side stop valve to be closed via the outdoor control device If the air conditioner is not equipped with an emergency stop control function, the gas side operation valve and the liquid side operation valve are not provided in the transition gas pipe and the transition liquid pipe without providing the gas side stop valve and the liquid side stop valve. It is only necessary to connect the connecting gas pipe and the connecting liquid pipe directly to the main unit, thereby sharing the outdoor unit incorporating the outdoor control device with the emergency stop control function. Either an air conditioner with an emergency stop control function or an air conditioner that does not have an emergency stop control function can be easily selected by installing or not providing a gas-side stop valve and a liquid-side stop valve in the piping and transition liquid piping. Reduced production efficiency and complexity of product management can be eliminated.
Further, according to the present invention, the outdoor control device has a direct emergency stop function for immediately stopping the operation of the air conditioner based on the emergency stop signal, and moves the refrigerant to the outdoor unit side by the emergency stop control based on the emergency stop signal. After that, the emergency stop control function for stopping the operation of the air conditioner is provided, and the switch can be set to either one. Therefore, the emergency stop function of the air conditioner by the outdoor control device is For example, a changeover switch or the like can be used to switch between the direct emergency stop function for immediately stopping the air conditioner and the emergency stop control function for stopping the air conditioner after moving the refrigerant to the outdoor unit side. it can. Therefore, any emergency stop function can be arbitrarily selected and set according to the situation where the air conditioner is installed.

  Furthermore, the air conditioner of the present invention is the above-described air conditioner, wherein the air conditioner is a multi-type air conditioner in which a plurality of the indoor units are connected in parallel to the transition gas pipe and the transition liquid pipe. And a receiver is provided in the refrigerant circuit on the outdoor unit side.

  According to the present invention, the air conditioner is a multi-type air conditioner in which a plurality of indoor units are connected in parallel to a transition gas pipe and a transition liquid pipe, and a receiver is provided in the refrigerant circuit on the outdoor unit side. Therefore, during emergency stop control, the refrigerant from the plurality of indoor units can be moved to the outdoor unit side, and the refrigerant can be stored in the equipment on the outdoor unit side including the outdoor heat exchanger and the receiver. it can. Therefore, by appropriately setting the receiver capacity, etc., and storing the refrigerant in the cycle on the outdoor unit side, in the event of an emergency stop such as a disaster or a refrigerant leak, the refrigerant flows from each indoor unit into the room. Risk can be reduced.

  Furthermore, the air conditioner of the present invention is any one of the above-described air conditioners, wherein the outdoor control device is operable by an input of the emergency stop signal from an external device or a unit built-in device. And

  According to the present invention, since the outdoor control device is operable by the input of the emergency stop signal from an external device or a unit built-in device, for example, an emergency stop signal from an external device such as a fire alarm or a seismometer Alternatively, the emergency stop function of the outdoor control device can be activated by inputting both emergency stop signals from unit built-in equipment such as a refrigerant leak detector. Therefore, it is possible to achieve the initial purpose by sufficiently functioning in various emergency stop situations and by making the air conditioner stop in an emergency state in a required state.

  According to the present invention, in the case of an air conditioner having a specification having an emergency stop control function, the crossover gas pipe and the crossover liquid connected to the gas side operation valve and the liquid side operation valve on the outdoor unit side are installed in the field. The piping is provided with a gas-side shut-off valve and a liquid-side shut-off valve, and the gas-side shut-off valve and the liquid-side shut-off valve are electrically connected to the output terminal of the outdoor control device. By making the side stop valve closeable, it can be installed as an air conditioner with an emergency stop control function, while when using an air conditioner with a specification that does not have an emergency stop control function, Instead of providing a gas-side stop valve and liquid-side shut-off valve in the transition liquid piping, it is only necessary to connect and connect the gas pipe and the transition liquid piping to the gas-side operation valve and the liquid-side operation valve. Depending on whether the gas side shutoff valve and the liquid side shutoff valve are installed in the transition gas pipe and the transition liquid pipe or not in the local installation work, the outdoor unit incorporating the outdoor control device with the stop control function is shared. Either an air conditioner having a stop control function or an air conditioner not having the stop control function can be easily selected, and a reduction in production efficiency and complexity of product management can be eliminated.

It is a block diagram of the air conditioner which concerns on one Embodiment of this invention. It is a control flowchart figure at the time of abnormal operation | movement of the air conditioner shown in FIG.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 shows a configuration diagram of an air conditioner according to an embodiment of the present invention, and FIG. 2 shows a control flowchart diagram during abnormal operation of the air conditioner.
In the present embodiment, as the air conditioner 1, a plurality of indoor units 3 </ b> A and 3 </ b> B are connected to a single outdoor unit 2 with a crossover gas pipe 4 and a crossover liquid pipe 5 extending from the outdoor unit 2. In the middle, a multi-type air conditioner 1 connected in parallel via a branching device 6 is shown.

  The outdoor unit 2 exchanges heat between the inverter-driven compressor 10 that compresses the refrigerant, the oil separator 11 that separates the oil from the refrigerant gas, the four-way switching valve 12 that switches the circulation direction of the refrigerant, and the refrigerant and the outside air. An outdoor heat exchanger 13 to be operated, an outdoor electronic expansion valve (EEVH) 14, a receiver 15 that stores liquid refrigerant, a supercooling heat exchanger 16 that gives supercooling to the liquid refrigerant, and a supercooling heat exchanger 16 A supercooling electronic expansion valve (EEVSC) 17 for controlling the amount of refrigerant diverted into the compressor, and an accumulator for separating the liquid component from the refrigerant gas sucked into the compressor 10 and sucking only the gas component into the compressor 10 side 18, a gas side operation valve 19 and a liquid side operation valve 20.

  Each said apparatus by the side of the outdoor unit 2 is connected as well-known through the refrigerant | coolant piping 21, and comprises the outdoor side refrigerant circuit 22. FIG. The outdoor unit 2 is provided with an oil return circuit 23 for returning the oil separated by the oil separator 11 to the compressor 10 by a predetermined amount, and a high pressure switch 24, a high pressure sensor 25, and a low pressure sensor 26. In addition, an outdoor fan (not shown) for ventilating the outside air to the outdoor control device 27 and the outdoor heat exchanger 13 is provided.

  The crossover gas pipe 4 and the crossover liquid pipe 5 are refrigerant pipes connected to the gas side operation valve 19 and the liquid side operation valve 20 on the outdoor unit 2 side, and are connected to the outdoor unit 2 and to it during installation work on site. The pipe length is set according to the distance between the plurality of indoor units 3A and 3B. An appropriate number of branching devices 6 are provided in the middle of the transition gas pipe 4 and the transition liquid piping 5, and an appropriate number of indoor units 3 </ b> A and 3 </ b> B are connected in parallel via the branching device 6. Thereby, one sealed refrigeration cycle (refrigerant circuit) 7 is configured.

  The indoor units 3 </ b> A and 3 </ b> B circulate indoor air to the indoor heat exchanger 28, an indoor heat exchanger 28 that exchanges heat between the indoor air and the refrigerant for indoor air conditioning, an indoor electronic expansion valve (EEVC) 29, and the indoor heat exchanger 28. An indoor fan or the like (not shown) is provided, and is connected to the branching device 6 via indoor branch gas pipes 4A and 4B and branch liquid pipes 5A and 5B.

In the air conditioner 1 described above, the cooling operation is performed as follows.
The high-temperature and high-pressure refrigerant gas compressed and discharged by the compressor 10 is separated from the oil contained in the refrigerant by the oil separator 11. Thereafter, the refrigerant gas is circulated to the outdoor heat exchanger 13 side by the four-way switching valve 12, and heat is exchanged with the outside air blown by the outdoor fan in the outdoor heat exchanger 13 to be condensed and liquefied. This liquid refrigerant passes through the outdoor electronic expansion valve 14 and is temporarily stored in the receiver 15.

  The liquid refrigerant whose circulation amount has been adjusted by the receiver 15 is partly diverted from the liquid pipe in the course of being circulated through the liquid pipe side via the supercooling heat exchanger 16, and the supercooling electronic expansion valve (EEVSC) 17. Heat exchange is performed with the refrigerant adiabatically expanded in order to provide a degree of supercooling. This liquid refrigerant is guided from the outdoor unit 2 to the liquid pipe 5 through the liquid side operation valve 20. Furthermore, the liquid refrigerant led out to the transition liquid pipe 5 is divided into the branch liquid pipes 5A and 5B of the indoor units 3A and 3B via the branching device 6.

  The liquid refrigerant divided into the branch liquid pipes 5A and 5B flows into the indoor units 3A and 3B, is adiabatically expanded by the indoor electronic expansion valve (EEVC) 29, and becomes a gas-liquid two-phase flow. 28. In the indoor heat exchanger 28, heat is exchanged between the indoor air circulated by the indoor fan and the refrigerant, and the indoor air is cooled and provided for indoor cooling. On the other hand, the refrigerant is vaporized, reaches the branching device 6 through the branch gas pipes 4A and 4B, and is merged with the refrigerant gas from the other indoor units through the crossover gas pipe 4.

  The refrigerant gas merged in the transition gas pipe 4 returns to the outdoor unit 2 side again, passes through the gas side operation valve 19 and the four-way switching valve 12, and merges with the refrigerant gas from the supercooling heat exchanger 16, and then the accumulator. 18 is introduced. In the accumulator 18, the liquid component contained in the refrigerant gas is separated, and only the gas component is sucked into the compressor 10. This refrigerant is compressed again in the compressor 10, and the cooling operation is performed by repeating the above cycle.

On the other hand, the heating operation is performed as follows.
The high-temperature and high-pressure refrigerant gas compressed and discharged by the compressor 10 is separated into the gas-side operation valve 19 via the four-way switching valve 12 after the oil contained in the refrigerant is separated by the oil separator 11. Circulated. The refrigerant circulated to the gas side operation valve 19 side is sent out from the outdoor unit 2 through the transition gas pipe 4, and is further passed through the branching unit 6 and the indoor side branch gas pipes 4A and 4B to a plurality of indoor units 3A and 3B. Led to.

  The high-temperature and high-pressure refrigerant gas introduced into the indoor units 3A and 3B is heat-exchanged with the indoor air circulated through the indoor fan in the indoor heat exchanger 30, and the indoor air is heated to be used for heating. . On the other hand, the liquid refrigerant condensed and liquefied in the indoor heat exchanger 28 reaches the branching device 6 through the indoor side electronic expansion valve (EEVC) 29 and the branch liquid pipes 5A and 5B, and merges with the liquid refrigerant from other indoor units. After that, it returns to the outdoor unit 2 side through the transition liquid pipe 5.

  During the heating operation, in the indoor units 3A and 3B, the refrigerant outlet temperature (hereinafter referred to as heat exchange outlet temperature) or the refrigerant subcooling degree of the indoor heat exchanger 28 functioning as a condenser becomes a target value. The opening degree of the indoor electronic expansion valve (EEVC) 29 is controlled. The refrigerant that has returned to the outdoor unit 2 side reaches the supercooling heat exchanger 16 via the liquid side operation valve 20, and is given supercooling as in the case of cooling, and then flows into the receiver 15 and is temporarily stored. Thus, the circulation amount is adjusted. This liquid refrigerant is supplied to the outdoor electronic expansion valve (EEVH) 14 and subjected to adiabatic expansion, and then flows into the outdoor heat exchanger 13.

  In the outdoor heat exchanger 13, heat is exchanged between the outside air blown through the outdoor fan and the refrigerant, so that the refrigerant absorbs heat from the outside air and is evaporated and gasified. This refrigerant is introduced from the outdoor heat exchanger 13 through the four-way switching valve 12 and the refrigerant gas from the supercooling heat exchanger 16 and then introduced into the accumulator 18. In the accumulator 18, the liquid component contained in the refrigerant gas is separated, and only the gas component is sucked into the compressor 10 and compressed again by the compressor 10. The heating operation is performed by repeating the above cycle.

Furthermore, in this embodiment, when an emergency stop situation such as an occurrence of a disaster such as an earthquake or a fire or a refrigerant leak occurs in the outdoor control device 27 that controls the operation of the air conditioner 1, An emergency stop control unit for emergency stop of operation is added.
The emergency stop control unit immediately stops the operation of the air conditioner 1 when an emergency stop signal is input from an external device 30 such as a fire alarm or a seismometer, or a unit built-in device 31 such as a refrigerant leak detector. An emergency stop unit 32 and an emergency stop control unit 33 that stops the operation of the air conditioner 1 after moving the refrigerant on the indoor unit 3A, 3B side to the outdoor unit 2 side, either one of which is controlled by the changeover switch 34 Switching setting is possible.

The direct emergency stop unit 32 has a function of immediately stopping the operation of the air conditioner 1 when an emergency stop signal is input from the external device 30 or the unit built-in device 31.
On the other hand, the emergency stop control unit 33 performs the operation of the air conditioner 1 after performing a so-called pump-down operation in which the refrigerant on the indoor unit 3A, 3B side is pumped and moved to the outdoor unit 2 side as shown in FIG. It has a function to stop. Below, the function of this emergency stop control part 33 is demonstrated in detail based on FIG.

  First, when an emergency stop signal is input from the external device 30 or the unit built-in device 31 in step S1, the process proceeds to step S2 to close the liquid-side stop valve 35. Thereafter, the process proceeds to step S3, where it is determined whether or not the cooling operation is being performed. If the cooling operation is being performed, the refrigeration cycle 7 is maintained in the cooling cycle and the process proceeds to step S4. If the heating operation is being performed, step S5 is performed. After shifting to step S4 and switching the heating cycle to the cooling cycle, the process proceeds to step S4. In step S4, the operation is continued with the drive frequency of the compressor 10 as the set frequency.

  By the pump-down operation by this cooling cycle, the refrigerant on the indoor unit 3A, 3B side is pumped into equipment such as the outdoor heat exchanger 13 and the receiver 15 on the outdoor unit 2 side, or refrigerant piping. During the pump down operation, the low pressure is monitored by the low pressure sensor 26 in step S6, and when the detected value of the low pressure sensor 26 falls below the set pressure due to the pumping of the refrigerant to the outdoor unit 2 side, the process proceeds to step S7. While closing the side closing valve 36, the compressor 10 is stopped and the operation | movement of the air conditioner 1 is stopped. Thereby, the driving | running of the air conditioner 1 can be stopped as the state which accumulated the refrigerant | coolant at the outdoor unit 2 side.

  Moreover, the liquid side shut-off valve 35 and the gas side shut-off valve 36 which are closed by the emergency stop control unit 33 at the time of emergency stop are respectively electromagnetic valves, and as shown in FIG. 1, the outdoor refrigerant circuit 22 of the outdoor unit 2 as shown in FIG. In the vicinity of the gas-side operation valve 19 and the liquid-side operation valve 20 provided in the gas-side operation valve 19, the connection gas pipe 4 and the connection liquid pipe 5 are installed. The liquid side shut-off valve 35 and the gas side shut-off valve 36 are connected and installed to the transition gas pipe 4 and the transition liquid pipe 5 during the field installation of the air conditioner 1, and are connected to the signal output terminal 37 of the outdoor control device 27. By being electrically connected, at the time of an emergency stop, as described above, it is closed by a closing signal from the emergency stop control unit 33.

With the configuration described above, according to the present embodiment, the following operational effects can be obtained.
In the air conditioner 1 described above, when an emergency stop such as an earthquake or a fire occurs or a refrigerant leak occurs, an external device 30 such as a fire alarm or a seismometer, or refrigerant leak detection is detected. In response to an emergency stop signal from the unit built-in device 31 such as a vessel, the outdoor control device 27 sets the stop method when the air conditioner 1 is emergency stopped to any one of the following (1) and (2) using the changeover switch 34 Switching can be set.

(1) The direct emergency stop unit 32 is selected and set, and when an emergency stop signal is input, the operation of the air conditioner 1 is immediately stopped.
(2) When the emergency stop control unit 33 is selected and set and an emergency stop signal is input, after performing a so-called pump-down operation in which the refrigerant on the indoor unit 3A, 3B side is pumped and moved to the outdoor unit 2 side, the air The operation of the harmony machine 1 is stopped.

  In the emergency stop when the emergency stop control unit 33 of (2) is selected and set, the liquid-side shut-off valve 35 is first closed by an emergency stop signal, and if the cooling operation is being performed, the cooling cycle is maintained and the heating operation is performed. If it is medium, the heating cycle is switched to the cooling cycle and the operation is continued. With this pump-down operation, the refrigerant on the indoor units 3A, 3B side is pumped up to the outdoor unit 2 side, and is stored in equipment such as the outdoor heat exchanger 13 and the receiver 15 and refrigerant piping. When the detection value of the low-pressure sensor 26 drops below the set pressure due to the refrigerant pumping movement, the gas-side stop valve 36 is closed and the operation of the air conditioner 1 is stopped.

  For this reason, the refrigerant filled in the refrigeration cycle 7 of the air conditioner 1 is pumped to the outdoor unit 2 side, and the air conditioner 1 is stopped in a state where it is stored. Even when a situation occurs, it is possible to prevent the refrigerant from flowing out of the indoor units 3A and 3B into the room.

  On the other hand, in the present embodiment, as described in (2) above, when the air conditioner 1 is urgently stopped, the emergency stop control function that stops the refrigerant on the indoor units 3A, 3B side as being moved to the outdoor unit 2 side is provided. In order to add, the liquid side shutoff valve 35 and the gas side shutoff valve 36 are arranged in the vicinity of the gas side operation valve 19 and the liquid side operation valve 20 to which the crossover gas pipe 4 and the crossover liquid pipe 5 on the outdoor unit 2 side are connected. An emergency stop is achieved by connecting the liquid side shut-off valve 35 and the gas side shut-off valve 36 to the signal output terminal 37 of the outdoor control device 27 while being installed in the crossover gas pipe 4 and the crossover liquid pipe 5. Sometimes, as described above, the liquid-side shutoff valve 35 and the gas-side shutoff valve 36 can be closed by a closing signal from the emergency stop control unit 33.

  For this reason, in the case of the air conditioner 1 having an emergency stop control function, the liquid side shut-off valve 35 and the gas side are optionally placed at the above positions of the crossover gas pipe 4 and the crossover liquid pipe 5 in the local installation work. A stop valve 36 is provided to connect the transition gas pipe 4 and the transition liquid pipe 5 to the gas side operation valve 19 and the liquid side operation valve 20, and signals from the liquid side stop valve 35, the gas side stop valve 36 and the outdoor control device 27. What is necessary is just to electrically connect between the output terminals 37, and when setting it as the air conditioner which is not equipped with an emergency stop control function, the gas side operation valve 19 of the outdoor unit 2 which shared the outdoor control device 27, and The transition gas pipe 4 and the transition liquid pipe 5 that are not provided with the liquid side shutoff valve 35 and the gas side shutoff valve 36 may be connected to the liquid side operation valve 20 and installed.

  Thus, according to the present embodiment, the outdoor unit 2 incorporating the outdoor control device 27 with the emergency stop control function is shared, and the gas side closure is performed on the transition gas pipe 4 and the transition liquid pipe 5 in the field installation work. Depending on whether the valve 36 and the liquid side shut-off valve 35 are provided or not, either the air conditioner 1 having the emergency stop control function or the air conditioner 1 not having the emergency stop control function can be easily selected, resulting in a decrease in production efficiency. And the complexity of product management can be eliminated.

  The air conditioner 1 is a multi-type air conditioner in which a plurality of indoor units 3A and 3B are connected in parallel to the crossover gas pipe 4 and the crossover liquid pipe 5, and a receiver is provided in the refrigerant circuit 22 on the outdoor unit 2 side. 15 is provided. For this reason, at the time of emergency stop control, the refrigerant from the plurality of indoor units 3A, 3B is moved to the outdoor unit 2 side, and the refrigerant is stored in the equipment on the outdoor unit 2 side including the outdoor heat exchanger 13 and the receiver 15. Accordingly, the capacity of the receiver 15 and the like are set as appropriate, and the refrigerant in the cycle is accumulated on the outdoor unit 2 side, so that each indoor unit 3A can be used in the event of a disaster or when an emergency stop occurs such as a refrigerant leak. , 3B can be prevented from flowing out into the room.

  Further, in the present embodiment, the outdoor control device 27 has a direct emergency stop function for immediately stopping the operation of the air conditioner 1 based on the emergency stop signal, and the outdoor unit by the emergency stop control based on the emergency stop signal. After moving to the second side, an emergency stop control function for stopping the operation of the air conditioner 1 is provided.

  For this reason, the emergency stop function of the air conditioner 1 by the outdoor control device 27, the direct emergency stop function that immediately stops the air conditioner 1 by the emergency stop signal, and the air conditioner after moving the refrigerant to the outdoor unit 2 side. 1 can be easily switched to and set to any one of the emergency stop control functions for stopping 1, so that any emergency stop function can be set depending on the situation where the air conditioner 1 is installed. It is possible to select and set arbitrarily.

  In addition, the outdoor control device 27 is operable by an emergency stop signal input from an external device 30 such as a fire alarm or a seismometer or a unit built-in device 31 such as a refrigerant leak detector. For this reason, the emergency stop function of the outdoor control device 27 is activated by inputting both an emergency stop signal from an external device 30 such as a fire alarm or a seismometer or an emergency stop signal from a unit built-in device 31 such as a refrigerant leak detector. Can be made. Accordingly, the initial purpose can be achieved by sufficiently exhibiting the function for various emergency stop situations and by causing the air conditioner 1 to stop in an emergency state in a required state.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, in the above-described embodiment, an example in which the present invention is applied to the multi-type air conditioner 1 has been described. Needless to say, the present invention can be similarly applied to a single-type air conditioner to which one indoor unit is connected.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Outdoor unit 3A, 3B Indoor unit 4 Transition gas piping 5 Transition liquid piping 15 Receiver 19 Gas side operation valve 20 Liquid side operation valve 22 Outdoor refrigerant circuit 26 Low pressure sensor 27 Outdoor control device 30 External apparatus 31 Built-in unit Equipment 32 Direct emergency stop part 33 Emergency stop control part 34 Changeover switch 35 Liquid side shutoff valve 36 Gas side shutoff valve 37 Output terminal

Claims (3)

In an air conditioner in which at least one indoor unit is connected via a crossover gas pipe and a crossover liquid pipe to one outdoor unit provided with an outdoor control device.
A gas side operation valve provided in the refrigerant circuit on the outdoor unit side, connected to the transition gas pipe, and a liquid side operation valve connected to the transition liquid pipe;
A gas-side stop valve provided in the transition gas pipe and located in the vicinity of the gas-side operation valve;
A liquid-side stop valve provided in the transition liquid pipe and positioned in the vicinity of the liquid-side operation valve;
An output terminal provided in the outdoor control device, for outputting a closing signal to the gas-side closing valve and the liquid-side closing valve;
With
The the outdoor controller, closed and straight emergency stop function to stop the operation of the emergency stop signal on the basis of immediately air conditioner, the liquid-side shut-off valve on the basis of the emergency stop signal, continues to operate as a cooling cycle It is, when the low pressure reaches the set pressure, closes the gas side shut-off valve, and emergency stop control function for stopping the operation of the air conditioner after moving the coolant, is provided in the outdoor unit side,
The outdoor unit is further provided with a changeover switch capable of switching between the direct emergency stop function and the emergency stop control function . The air conditioner is a multi-type air conditioner in which a plurality of the indoor units are connected in parallel to the transition gas pipe and the transition liquid pipe.
The air conditioner according to claim 1, wherein a receiver is provided in the refrigerant circuit on the outdoor unit side. The air conditioner according to claim 1 or 2 , wherein the outdoor control device is operable by an input of the emergency stop signal from an external device or a unit built-in device.

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