Air conditioner

Abstract

The purposes of this disclosure is to improve safety of an air conditioner. In an air conditioner (100) in one aspect of the present disclosure, a refrigerant circulates, in the following order, through a compressor (3), a first heat exchanger (1), an expansion valve (5), and a second heat exchanger (6). The first heat exchanger (1) is disposed in a first space. The second heat exchanger (6) is disposed in a second space. The air conditioner (100) is provided with: multiple refrigerant sensors (10b, 21, 31) provided in the first space and configured to detect a refrigerant; and a control device (12b) configured to determine leakage of the refrigerant by using detection signals from the refrigerant sensors (10b, 21, 31), said determination being based on a preset condition.

Description

air conditioner

[0001] The present disclosure relates to an air conditioner having a function for detecting refrigerant leakage.

[0002] Air conditioners with a function for detecting refrigerant leaks have been known. For example, Japanese Patent Application Laid-Open No. 2012-127519 (Patent Document 1) discloses an air conditioner equipped with a refrigerant sensor that detects refrigerant leaks indoors. In this air conditioner, when the refrigerant sensor detects a refrigerant leak, the refrigerant is sealed in the refrigeration cycle circuit of either the indoor unit side or the outdoor unit side where the refrigerant is not leaking, thereby reducing the amount of refrigerant leakage.

[0003] JP 2012-127519 A

[0004] However, conventional air conditioners detect refrigerant leaks using only one refrigerant sensor. If the refrigerant sensor malfunctions, the refrigerant leak cannot be detected, the leak is discovered late, and the air conditioner stops functioning properly. Furthermore, if the refrigerant is flammable, there is a risk of a fire caused by the refrigerant leak. Conversely, a malfunctioning refrigerant sensor may result in a false detection of a refrigerant leak.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to improve the safety of air conditioners.

[0006] In an air conditioner according to one aspect of the present disclosure, a refrigerant circulates through a compressor, a first heat exchanger, an expansion valve, and a second heat exchanger in this order. The first heat exchanger is disposed in a first space, and the second heat exchanger is disposed in a second space. The air conditioner includes: a plurality of refrigerant sensors disposed in the first space for detecting the refrigerant; and a control device that uses detection signals from the plurality of refrigerant sensors to determine whether a refrigerant leaks based on preset conditions.

[0007] In the air conditioner according to the present disclosure, the control device uses detection signals from multiple refrigerant sensors to determine whether a refrigerant leak has occurred based on preset conditions, enabling accurate detection of a refrigerant leak, thereby improving the safety of the air conditioner.

[0008] Fig. 1 is a schematic diagram showing the configuration of an air conditioner according to an embodiment. Fig. 2 is a functional block diagram for explaining the function of detecting refrigerant leakage in an air conditioner according to an embodiment. Fig. 3 is a diagram for explaining setting conditions for detecting refrigerant leakage performed by a shutoff control device. Fig. 4 is a flowchart for explaining processing for detecting refrigerant leakage performed by a shutoff control device. Fig. 5 is a schematic diagram showing the configuration of an air conditioning system including an air conditioner according to an embodiment.

[0009] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and their description will not be repeated in principle.

[0010] Embodiment. FIG. 1 is a schematic diagram showing the configuration of an air conditioner 100 according to an embodiment. FIG. 2 is a functional block diagram illustrating a function for detecting refrigerant leakage in the air conditioner 100 according to the embodiment. The air conditioner 100 uses refrigerants such as R32 (fluorine-based) and flammable R290 (propane). The air conditioner 100 has operating modes including a heating mode, a cooling mode, and a defrosting mode. As shown in FIG. 1, the air conditioner 100 includes an indoor unit 10 and an outdoor unit 11. Both the indoor unit 10 and the outdoor unit 11 are supplied with power from a main power supply (not shown).

[0011] The indoor unit 10 is disposed in the room 20 (first space). The indoor unit 10 includes an indoor heat exchanger 1 (first heat exchanger), an indoor fan 2, an expansion valve 5, an indoor unit control device 10a, a refrigerant sensor 10b, and an alarm device 10c. Furthermore, the indoor unit 10 has a refrigerant sensor 21 in the room 20, separate from the refrigerant sensor 10b provided inside the indoor unit 10. The refrigerant sensor 21 is provided, for example, on a wall of the room 20 or built into a remote control for the indoor unit 10. The refrigerant sensor 21 is capable of wired or wireless communication with the indoor unit control device 10a, and is capable of transmitting a detection signal to the indoor unit control device 10a.

[0012] The outdoor unit 11 is disposed outdoors (second space). The outdoor unit 11 includes a compressor 3, a four-way valve 4, an outdoor heat exchanger 6 (second heat exchanger), an outdoor fan 7, an outdoor unit control device 8, and an accumulator 9. A shutoff device 12 that shuts off refrigerant leakage is provided in a pipe (path) that circulates refrigerant between the indoor unit 10 and the outdoor unit 11. The shutoff device 12 is provided, for example, in the attic 30. The shutoff device 12 has a shutoff valve 12a provided in the pipe that passes through the attic 30 and a shutoff control device 12b that controls the opening and closing of the shutoff valve 12a. Furthermore, a refrigerant sensor 31 is provided in the attic 30. The refrigerant sensor 31 is capable of wired or wireless communication with the shutoff control device 12b and is capable of transmitting a detection signal to the shutoff control device 12b.

[0013] In the heating mode, the outdoor unit control device 8 controls the four-way valve 4 to form a flow path so that the refrigerant circulates in the order of the compressor 3, indoor heat exchanger 1, expansion valve 5, and outdoor heat exchanger 6. In the heating mode, the indoor heat exchanger 1 functions as a condenser, and the outdoor heat exchanger 6 functions as an evaporator.

[0014] In the cooling mode and the defrost mode, the outdoor unit control device 8 controls the four-way valve 4 to form a flow path so that the refrigerant circulates in the order of the compressor 3, the outdoor heat exchanger 6, the expansion valve 5, and the indoor heat exchanger 1. In the cooling mode and the defrost mode, the indoor heat exchanger 1 functions as an evaporator, and the outdoor heat exchanger 6 functions as a condenser.

[0015] The outdoor unit control device 8 controls the amount of refrigerant discharged per unit time by the compressor 3 by controlling the drive frequency of the compressor 3. The outdoor unit control device 8 adjusts the opening degree of the expansion valve 5. The outdoor unit control device 8 controls the amount of air sent per unit time by the outdoor fan 7, and the indoor unit control device 10a controls the amount of air sent per unit time by the indoor fan 2.

[0016] Refrigerant sensor 10b transmits a detection signal indicating the detection of refrigerant to indoor unit control device 10a. Indoor unit control device 10a transmits the detection signal from refrigerant sensor 10b and the detection signal from refrigerant sensor 21 to shutoff control device 12b. Shutoff control device 12b determines whether a refrigerant leak has occurred using the detection signals from the three refrigerant sensors (refrigerant sensor 10b, refrigerant sensor 21, and refrigerant sensor 31). Refrigerant sensor 10b and refrigerant sensor 21 transmit their detection signals to shutoff control device 12b via indoor unit control device 10a, but they may also transmit their detection signals directly to shutoff control device 12b. Refrigerant sensor 10b, refrigerant sensor 21, and refrigerant sensor 31 may be either infrared or semiconductor type.

[0017] In an air conditioner, if refrigerant leaks are detected only by the refrigerant sensor in the indoor unit, if the refrigerant sensor malfunctions, the refrigerant leak cannot be detected, the detection of the refrigerant leak is delayed, and the air conditioner may not function properly. Furthermore, if the refrigerant is flammable, there is a risk of a fire caused by the refrigerant leak. Conversely, a malfunctioning refrigerant sensor may result in a false detection of a refrigerant leak.

[0018] Therefore, in this embodiment, the air conditioner 100 is provided with multiple refrigerant sensors 10b, 21 that detect refrigerant in the room 20, and the shutoff control device 12b determines a refrigerant leak using detection signals from the multiple refrigerant sensors 10b, 21. This allows the air conditioner 100 to detect a refrigerant leak with greater accuracy than when a refrigerant leak is determined using only one refrigerant sensor, thereby improving the safety of the air conditioner. Note that if the attic space 30 is considered the room in a broad sense, the refrigerant sensor 31 is also one of the refrigerant sensors provided in the room.

[0019] 2 shows how the shutoff control device 12b receives detection signals from the refrigerant sensors 10b, 21, and 31, determines whether a refrigerant leak has occurred, and issues a command when a leak has occurred. The shutoff control device 12b is specifically a control circuit and includes a CPU 121 and a memory 122. The CPU 121 executes various programs stored in the memory 122 to determine whether a refrigerant leak has occurred and issue a command.

[0020] The CPU 121 is a processor that can read and execute programs (for example, an OS and a control program) stored in the memory 122. The CPU 121 executes various programs read from the memory 122.

[0021] The memory 122 is configured by, for example, a nonvolatile storage device such as a ROM or a flash memory, etc. The memory 122 stores an OS for realizing basic functions, as well as a control program for determining a refrigerant leak and issuing a command, setting conditions, etc.

[0022] The shutoff control device 12b issues different commands when it determines that a refrigerant leak has occurred depending on the set conditions, and issues a command to the indoor unit control device 10a to perform agitation operation, a command to issue an alarm with the alarm device 10c, or a command to close the shutoff valve 12a. Specifically, Figure 3 is a diagram for explaining the set conditions for detecting a refrigerant leak performed by the shutoff control device 12b.

[0023] Here, the agitation operation is an operation for the purpose of agitating refrigerant leaked into the room 20, and the operation itself is an air blowing operation with the circulation of refrigerant stopped. The alarm 10c is provided inside the indoor unit 10 and may be a warning light (e.g., an LED element) that alerts the user to a refrigerant leak with light, a sound output device (e.g., a speaker) that alerts the user with sound, or a display device (e.g., a liquid crystal display element) that alerts the user with text. The alarm 10c may be provided outside the indoor unit 10, and for example, the display device on the remote control of the indoor unit 10 may be used. Note that while the air conditioner 100 according to this embodiment is described as being configured to include the alarm 10c and the shutoff device 12, the configuration is not limited to this, and the air conditioner may be configured without either the alarm 10c, the shutoff device 12, or both.

[0024] Setting condition 1 is an example in which different commands are issued when one to fewer than N refrigerant sensors among the multiple refrigerant sensors detect refrigerant than when N or more refrigerant sensors detect refrigerant. Note that N is a set number that can be freely set by the user. Under setting condition 1, when one to fewer than N refrigerant sensors detect refrigerant, the shutoff control device 12b issues a command to issue an alarm with the alarm device 10c. On the other hand, when N or more refrigerant sensors detect refrigerant, the shutoff control device 12b not only stops the air conditioner 100 and issues a command to issue an alarm with the alarm device 10c, but also issues a command to the indoor unit control device 10a to perform agitation operation and to close the shutoff valve 12a.

[0025] Specifically, when three refrigerant sensors, 10b, 21, and 31, are installed and N=2, if two or more of refrigerant sensors 10b, 21, and 31 detect refrigerant, shutoff control device 12b stops air conditioner 100 and a) issues an alarm, b) shuts off the refrigerant, and c) performs agitation operation. Of course, if two or more refrigerant sensors detect refrigerant, shutoff control device 12b may issue different commands, such as a) issuing an alarm and b) shutting off the refrigerant, or a) issuing an alarm and c) performing agitation operation. Furthermore, shutoff control device 12b may be configured not to issue a command if fewer than two refrigerant sensors detect refrigerant.

[0026] Setting condition 2 is an example of the command content issued when any of the refrigerant sensors detects a refrigerant. Under setting condition 2, when any of the refrigerant sensors detects a refrigerant, the shutoff control device 12b not only stops the air conditioner 100 and issues a command to issue an alarm with the alarm device 10c, but also issues a command to the indoor unit control device 10a to perform agitation operation and to close the shutoff valve 12a.

[0027] Specifically, in the case where three refrigerant sensors, 10b, 21, and 31, are provided, if any of refrigerant sensors 10b, 21, and 31 detects a refrigerant, shutoff control device 12b will stop air conditioner 100 and then a) issue an alarm, b) shut off the refrigerant, and c) perform agitation operation. Of course, if any of the refrigerant sensors detects a refrigerant, shutoff control device 12b may change the content of the command to be issued, such as a) issue an alarm and b) shut off the refrigerant, or a) issue an alarm and c) perform agitation operation.

[0028] Setting condition 3 is a case where the multiple refrigerant sensors include refrigerant sensors that are subordinate to each other, such as a main refrigerant sensor and a sub refrigerant sensor. Setting condition 3 is an example in which the command content issued differs depending on whether only the sub refrigerant sensor detects refrigerant or whether the main refrigerant sensor or both the main refrigerant sensor and the sub refrigerant sensor detect refrigerant. Here, the main refrigerant sensor is, for example, refrigerant sensor 21 or refrigerant sensor 31 located far from the indoor unit 10, and the sub refrigerant sensor is refrigerant sensor 10b located inside the indoor unit 10. The user may be able to set which of the multiple refrigerant sensors will be the main refrigerant sensor.

[0029] In set condition 3, when only the sub refrigerant sensor detects refrigerant, the shutoff control device 12b issues a command to the alarm device 10c to sound an alarm. On the other hand, when the main refrigerant sensor, or the main refrigerant sensor and the sub refrigerant sensor, detects refrigerant, the shutoff control device 12b not only stops the air conditioner 100 and issues a command to the alarm device 10c to sound an alarm, but also issues a command to the indoor unit control device 10a to perform agitation operation and to close the shutoff valve 12a.

[0030] Specifically, when three refrigerant sensors, refrigerant sensor 10b, refrigerant sensor 21, and refrigerant sensor 31, are provided, the refrigerant sensor 31 being the main refrigerant sensor. When refrigerant sensor 31 detects refrigerant, the shutoff control device 12b stops the air conditioner 100 and then a) issues an alarm, b) shuts off the refrigerant, and c) performs agitation operation. Of course, when refrigerant sensor 31 detects refrigerant, the shutoff control device 12b may change the command it issues, such as a) issuing an alarm and b) shutting off the refrigerant, or a) issuing an alarm and c) performing agitation operation. Furthermore, the shutoff control device 12b may be configured not to issue a command when refrigerant sensor 10b, the sub-refrigerant sensor, detects refrigerant.

[0031] The setting conditions shown in Fig. 3 are examples, and the air conditioner 100 may also adopt setting conditions that are not shown. The content of the setting conditions may also be freely set by the user. Furthermore, the content of the setting conditions may also be changed depending on the type of refrigerant used. For example, if the refrigerant is flammable, the shutoff control device 12b may issue a command b) requiring the shutoff of the refrigerant.

[0032] Next, the process for detecting a refrigerant leak in the air conditioner 100 for which the setting conditions shown in Fig. 3 can be set will be described using a flowchart. Fig. 4 is a flowchart for explaining the process for detecting a refrigerant leak performed by the shutoff control device 12b. The process shown in Fig. 4 is called periodically or irregularly by a main routine (not shown) that controls the operation of the air conditioner 100.

[0033] 4, the shutoff control device 12b determines whether refrigerant sensors 10b, 21, and 31 have detected a refrigerant leak into the room (step S101). If none of the refrigerant sensors have detected a refrigerant leak (NO in step S101), the process returns to step S101. On the other hand, if at least one of refrigerant sensors 10b, 21, and 31 has detected a refrigerant leak (YES in step S101), the shutoff control device 12b further determines whether the set condition is set condition 3 (step S102).

[0034] If the set condition is set condition 3 (YES in step S102), the shutoff control device 12b determines whether the main refrigerant sensor (for example, refrigerant sensor 31) has detected a refrigerant leak into the room (step S103). If the main refrigerant sensor detects a refrigerant leak (YES in step S103), the shutoff control device 12b stops the air conditioner 100 and then a) issues an alarm, b) shuts off the refrigerant, and c) performs agitation operation (step S104). The shutoff control device 12b then ends the process.

[0035] On the other hand, if the main refrigerant sensor does not detect a refrigerant leak (NO in step S103), the shutoff control device 12b issues a warning to the user using an alarm (step S105). Note that since the air conditioner 100 is not stopped, the shutoff control device 12b then returns the process to step S101.

[0036] Returning to step S102, if the set condition is not set condition 3 (NO in step S102), the shutoff control device 12b further determines whether the set condition is set condition 1 (step S110). If the set condition is set condition 1 (YES in step S110), the shutoff control device 12b determines whether N or more refrigerant sensors (e.g., N = 2) among the multiple refrigerant sensors have detected a refrigerant leak into the room (step S111). If N or more refrigerant sensors have detected a refrigerant leak (YES in step S111), the shutoff control device 12b stops the air conditioner 100 and then a) issues an alarm, b) shuts off the refrigerant, and c) performs agitation operation (step S112). The shutoff control device 12b then ends the process.

[0037] On the other hand, if less than N refrigerant sensors have detected a refrigerant leak (NO in step S111), the shutoff control device 12b issues a warning to the user using an alarm (step S113). Note that since the air conditioner 100 has not stopped, the shutoff control device 12b then returns the process to step S101.

[0038] Returning to step S110, if the set condition is not set condition 1 (NO in step S110), the shutoff control device 12b determines that the set condition is set condition 2 (step S120). Since the set condition is set condition 2, the shutoff control device 12b stops the air conditioner 100 and then a) issues an alarm, b) shuts off the refrigerant, and c) performs agitation operation (step S121). The shutoff control device 12b then ends the processing.

[0039] As shown in Figure 4, the air conditioner 100 has multiple refrigerant sensors 10b, 21, and 31 installed in the room 20 to detect refrigerant. The detection signals from the multiple refrigerant sensors 10b, 21, and 31 are used to determine a refrigerant leak based on design conditions using the shutoff control device 12b, and a predetermined command is issued. This allows the air conditioner 100 to detect a refrigerant leak more accurately than when a refrigerant leak is determined using only one refrigerant sensor. By taking appropriate action based on the detected refrigerant sensor, the safety of the air conditioner can be improved. Furthermore, the shutoff control device 12b may allow the user to select setting conditions from multiple setting conditions (for example, the setting conditions shown in Figure 3).

[0040] Modifications In the above-described embodiment, it has been described that the shutoff control device 12b determines whether a refrigerant leak has occurred using detection signals from multiple refrigerant sensors 10b, 21, and 31. However, the control device that determines whether a refrigerant leak has occurred is not limited to the shutoff control device 12b, and may be the indoor unit control device 10a or the outdoor unit control device 8. For example, when the indoor unit control device 10a determines whether a refrigerant leak has occurred, it is necessary to configure the indoor unit control device 10a so that detection signals from multiple refrigerant sensors 10b, 21, and 31 are transmitted to the indoor unit control device 10a. The detection signals from the refrigerant sensors 10b, 21, and 31 are, for example, signals that turn ON when the refrigerant sensors 10b, 21, and 31 detect a refrigerant.

[0041] Furthermore, the air conditioner 100 may cooperate with devices other than the air conditioner 100 to form a system for responding to refrigerant leaks. FIG. 5 is a schematic diagram showing the configuration of an air conditioning system 1000 including the air conditioner 100 according to an embodiment. Note that in the air conditioner 100 shown in FIG. 5, the same components as those in the air conditioner 100 shown in FIG. 1 are designated by the same reference numerals, and detailed description thereof will not be repeated. The air conditioning system 1000 shown in FIG. 5 includes the air conditioner 100, a ventilation fan 22 provided in the room 20, and an alarm device 23. The ventilation fan 22 is a device for releasing refrigerant that has leaked into the room to the outside, and can be controlled by communication with the air conditioner 100. The alarm device 23 is connected via communication with, for example, a control room or the like outside the room, and is a device capable of notifying the control room or the like that a refrigerant leak has occurred in the room 20.

[0042] Specifically, for example, when the setting condition of the air conditioner 100 is setting condition 3 and the air conditioner has three refrigerant sensors, refrigerant sensor 10b, refrigerant sensor 21, and refrigerant sensor 31, refrigerant sensor 31 is designated as the main refrigerant sensor. When refrigerant sensor 31 detects a refrigerant, the shutoff control device 12b stops the air conditioner 100 and, in addition to a) issuing an alarm, b) shutting off the refrigerant, and c) performing agitation operation, starts the ventilation fan 22 and notifies the alarm device 23 of a refrigerant leak. Starting the ventilation fan 22 replaces the air in the room 20 and releases the leaked refrigerant outside. Furthermore, by notifying the alarm device 23 of a refrigerant leak, a manager other than the user can also be notified of the refrigerant leak, allowing more appropriate measures to be taken.

[0043] The air conditioning system 1000 shown in Figure 5 is one example, and the devices linked to the air conditioner 100 are not limited to the ventilation fan 22 and the alarm device 23. For example, the air conditioning system may be configured by linking a mobile terminal such as a smartphone with the air conditioner 100. Linking the mobile terminal with the air conditioner 100 not only notifies the mobile terminal of a refrigerant leak, but also makes it possible to set the settings for the air conditioner 100 from the mobile terminal.

[0044] The embodiments disclosed herein are intended to be combined appropriately within the scope of compatibility. The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims.

[0045] 1 indoor heat exchanger, 2 indoor fan, 3 compressor, 4 four-way valve, 5 expansion valve, 6 outdoor heat exchanger, 7 outdoor fan, 8 outdoor unit control device, 9 accumulator, 10 indoor unit, 10a indoor unit control device, 10b, 21, 31 refrigerant sensor, 10c alarm, 11 outdoor unit, 12 shutoff device, 12a shutoff valve, 12b shutoff control device, 20 indoor, 30 attic, 100 air conditioner.

Claims

1. An air conditioner in which a refrigerant circulates through a compressor, a first heat exchanger, an expansion valve, and a second heat exchanger in this order, the first heat exchanger is disposed in the first space; the second heat exchanger is disposed in the second space, The air conditioner comprises: a plurality of refrigerant sensors provided in the first space and configured to detect the refrigerant; a control device that determines whether or not there is a refrigerant leak based on set conditions using detection signals from the plurality of refrigerant sensors; The control device sets the set condition as a condition selected by a user from a plurality of conditions including command contents according to the number of refrigerant sensors that detect the refrigerant, among the plurality of refrigerant sensors.

2. The air conditioner according to claim 1 , wherein the plurality of refrigerant sensors include at least one refrigerant sensor provided within an apparatus having the first heat exchanger, and at least one refrigerant sensor provided outside the apparatus.

3. 3. The air conditioner according to claim 1, wherein the control device determines that the refrigerant has leaked when it receives a detection signal from at least one of the plurality of refrigerant sensors that detects a leak of the refrigerant, as the set condition.

4. The air conditioner further includes an alarm that issues an alarm to a user, The air conditioner according to claim 3 , wherein the control device issues an alarm to the user by means of the alarm device when it determines that the refrigerant has leaked.

5. The air conditioner is capable of agitation operation in which air is blown while the circulation of the refrigerant is stopped, The air conditioner according to claim 4 , wherein the control device performs the agitation operation when it determines that the refrigerant has leaked.

6. a shutoff device provided in a path through which the refrigerant circulates and configured to shut off leakage of the refrigerant; The air conditioner according to claim 3 , wherein the control device, when determining that the refrigerant has leaked, causes the shutoff device to shut off the leakage of the refrigerant.

7. The air conditioner comprises: Agitation operation is possible in which air is blown while the circulation of the refrigerant is stopped, and an alarm that issues an alarm to a user. The control device When the detection signal is received from one to less than a set number of refrigerant sensors among the plurality of refrigerant sensors and it is determined that the refrigerant has leaked, the alarm issues an alarm to the user; 3. The air conditioner according to claim 1, wherein, as the set condition, when the detection signals are received from a set number or more of the plurality of refrigerant sensors and it is determined that the refrigerant has leaked, the alarm issues an alarm to the user and performs the agitation operation.

8. a shutoff device provided in a path through which the refrigerant circulates and configured to shut off leakage of the refrigerant; The air conditioner according to claim 7, wherein when the control device determines, as the set condition, that the refrigerant has leaked by receiving the detection signals from a set number or more of the plurality of refrigerant sensors, the control device further shuts off the refrigerant leakage with the shut-off device.

9. The air conditioner comprises: Agitation operation is possible in which air is blown while the circulation of the refrigerant is stopped, and an alarm that issues an alarm to a user. the plurality of refrigerant sensors include a first refrigerant sensor and a second refrigerant sensor; The control device When the detection signal is received only from the second refrigerant sensor and it is determined that the refrigerant has leaked, the alarm issues an alarm to the user, and 3. The air conditioner according to claim 1, wherein, as the setting condition, when the detection signal is received from at least the first refrigerant sensor and it is determined that the refrigerant has leaked, the alarm issues an alarm to the user and performs the fan operation.

10. a shutoff device provided in a path through which the refrigerant circulates and configured to shut off leakage of the refrigerant; The air conditioner according to claim 9, wherein the control device, when receiving the detection signal from at least the first refrigerant sensor and determining that the refrigerant has leaked, further shuts off the leakage of the refrigerant with the shut-off device, as the set condition.