Refrigerant discharge unit, refrigeration cycle device, and refrigerant discharge method

Abstract

To provide a refrigerant discharge unit that automatically controls the discharge of a refrigerant enclosed in a refrigerant circuit, to the atmosphere.SOLUTION: A refrigerant discharge unit discharges a refrigerant enclosed in a refrigerant circuit (11) for performing a refrigeration cycle, and comprises: a flow passage (61) connected to the refrigerant circuit (11), and for discharging the refrigerant enclosed in the refrigerant circuit (11), to the outside; a valve (62) for adjusting the opening degree of the flow passage (61); and a control unit (C1) for controlling the valve (62).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a refrigerant discharge unit, a refrigeration cycle device, and a refrigerant discharge method. [Background technology]

[0002] In a refrigeration system equipped with a refrigerant circuit in which a refrigerant is sealed, it may be necessary to remove the refrigerant from the refrigeration system when the system is no longer in use. Patent Document 1 discloses an air purge device that removes a flammable refrigerant from a refrigerant circuit in which the refrigerant is sealed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-243136 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when using natural refrigerants such as HC refrigerants and CO2 refrigerants, which have a relatively low global warming potential, the refrigerant may be released into the atmosphere from the refrigeration equipment when it is no longer in use. In such cases, depending on the installation location of the refrigeration equipment and the location where the refrigerant is released, the refrigerant concentration in the air may become high, so it is preferable to automatically control the amount of refrigerant released into the air.

[0005] An object of the present disclosure is to provide a refrigerant release unit that automatically controls the release of refrigerant sealed in a refrigerant circuit into the atmosphere. [Means for solving the problem]

[0006] The first aspect is A refrigerant discharge unit that discharges refrigerant sealed in a refrigerant circuit (11) that performs a refrigeration cycle, a flow path (61) connected to the refrigerant circuit (11) for discharging the refrigerant sealed in the refrigerant circuit (11) to the outside; a valve (62) disposed in the flow path (61) and having an adjustable opening; a control unit (C1) for controlling the opening degree of the valve (62); Refrigerant release unit.

[0007] In the first aspect, the flow rate of the refrigerant released into the atmosphere can be adjusted by controlling the valve (62). This prevents the refrigerant from stagnating and increasing in concentration when the refrigerant is released into the atmosphere. As a result, the refrigerant can be released from the flow path (61) with the refrigerant concentration in the air at the time of release kept below a predetermined value. Furthermore, this eliminates the need for additional components such as a release hose, thereby reducing the workload involved in releasing the refrigerant.

[0008] The second aspect is the first aspect, The refrigerant is a natural refrigerant.

[0009] In the second embodiment, even if the refrigerant is released into the atmosphere, the same effects as in the first embodiment can be obtained by using the refrigerant release unit of the present disclosure.

[0010] The third aspect is the second aspect, The refrigerant is carbon dioxide.

[0011] In the third aspect, it is possible to suppress an increase in the carbon dioxide concentration in the air near the worker when the refrigerant is released.

[0012] A fourth aspect is any one of the first to third aspects, The cooling system further includes a detector (55) for detecting the refrigerant released from the flow path (61) to the outside.

[0013] In the fourth aspect, the concentration of the refrigerant released to the outside from the flow path (61) can be detected.

[0014] The fifth aspect is the fourth aspect, The flow path (61) has a discharge port (61a) for discharging the refrigerant to the outside, The detection section (55) is disposed near the discharge port (61a).

[0015] In the fifth aspect, the refrigerant concentration in the air at the discharge port (61a) can be detected, that is, the refrigerant concentration in the air immediately after it is discharged to the outside from the discharge port (61a) can be detected.

[0016] A sixth aspect is the fourth or fifth aspect, The control section (C1) adjusts the opening of the valve (62) based on the value detected by the detection section (55).

[0017] In the sixth aspect, for example, by controlling the valve (62) so that the release rate of the refrigerant is slower than the diffusion rate of the refrigerant into the atmosphere, the concentration of the released refrigerant can be kept below a predetermined concentration.

[0018] The seventh aspect is the sixth aspect, the refrigerant is carbon dioxide; The detection unit (55) detects the concentration of the refrigerant, The control unit (C1) controls the opening of the valve (62) so that the concentration of the refrigerant detected by the detection unit (55) becomes lower than a value corresponding to QLMV (kg / m^3), which is the concentration limit for minimum ventilation of carbon dioxide.

[0019] In the seventh aspect, the concentration of the carbon dioxide refrigerant released from the flow path (61) can be prevented from becoming higher than the QLMV.

[0020] The eighth aspect is the sixth aspect, The refrigerant is a flammable refrigerant, The detection unit (55) detects the concentration of the refrigerant, The control section (C1) controls the concentration of the refrigerant detected by the detection section (55) so that it becomes lower than a value corresponding to LFL (%), which is the lower flammability limit of the flammable refrigerant.

[0021] In the eighth aspect, the concentration of the flammable refrigerant released from the flow path (61) can be prevented from becoming higher than the LFL.

[0022] The ninth aspect is any one of the first to eighth aspects. The flow path (61) has a discharge port (61a) for discharging the refrigerant to the outside, The device further includes a sealing portion (94) for sealing the discharge port (61a).

[0023] In the ninth aspect, even when the valve (62) is fully closed, the sealing portion (94) can prevent refrigerant from leaking from the discharge port (61a).

[0024] A tenth aspect is a refrigeration cycle apparatus including the refrigerant discharge unit (U) according to any one of the first to ninth aspects and the refrigerant circuit (11).

[0025] A tenth aspect can provide a refrigeration cycle device including any one of the refrigerant discharge units (U) of the first to ninth aspects.

[0026] An eleventh aspect is the method according to the tenth aspect, The flow path (61) is connected to a high-pressure line (H) in the refrigerant circuit (11) through which a high-pressure refrigerant flows.

[0027] In the eleventh aspect, the flow path (61) is connected to the high-pressure line (H) through which the high-pressure refrigerant flows, so that the refrigerant can be discharged without operating the compressor (21), thereby preventing the refrigerant from remaining in the refrigerant circuit (11).

[0028] A twelfth aspect is the method according to the tenth aspect, The refrigerant circuit (11) further includes a receiver (71) connected to an intermediate-pressure line (M) through which an intermediate-pressure refrigerant flows or a high-pressure line (H) through which a high-pressure refrigerant flows, and the flow path (61) is connected to the receiver (71).

[0029] In the twelfth aspect, the receiver (71) is connected to the intermediate pressure line (M) or the high pressure line (H), so that the refrigerant can be discharged through the receiver (71) even without operating the compressor (21).

[0030] A thirteenth aspect is the tenth aspect, The flow path (61) is connected to the intermediate-pressure line (M) through which intermediate-pressure refrigerant flows in the refrigerant circuit (11).

[0031] In the thirteenth aspect, the flow path (61) is connected to the intermediate pressure line (M), so that the refrigerant can be discharged without operating the compressor (21).

[0032] A fourteenth aspect is the tenth aspect, The flow path (61) is connected to a low-pressure line (L) in the refrigerant circuit (11) through which a low-pressure refrigerant flows.

[0033] In the fourteenth embodiment, the refrigerant can also be discharged from the low pressure line (L).

[0034] A fifteenth aspect is any one of the tenth to fourteenth aspects, A heat source unit (20) is provided outside the room, The heat source unit (20) a compressor (21) and a heat source side heat exchanger (22) connected to the refrigerant circuit (11); a casing (35) that accommodates the compressor (21), the heat source side heat exchanger (22), and a transport section (25) that transports outside air to the heat source side heat exchanger (22), An air passage (S2) through which the air transported by the transport part (25) flows is formed in the casing (35), The flow path (61) has a discharge port (61a) for discharging the refrigerant, The outlet (61a) is disposed in the air passage (S2).

[0035] In the fifteenth aspect, the refrigerant in the flow path (61) is released into the air flowing through the air passage (S2), thereby allowing the refrigerant to be diffused into the atmosphere.

[0036] A sixteenth aspect is the fifteenth aspect, The heat source unit (20) further includes a detector (55) that detects the refrigerant discharged from the discharge port (61a), The detection section (55) is located downstream of the transfer section (25) in the air flow direction.

[0037] In the sixteenth aspect, the concentration of the refrigerant discharged from the discharge port (61a) can be detected more accurately.

[0038] A seventeenth aspect is a refrigerant circuit (11) for performing a refrigeration cycle; a flow path (61) connected to the refrigerant circuit (11) and having a discharge port (61a) for discharging the refrigerant to the outside; a valve (62) disposed in the flow path (61) and having an adjustable opening; a detection unit (55) disposed near the discharge port (61 a) and configured to detect the refrigerant discharged from the discharge port (61 a), This is a discharge method in which the opening of the valve (62) is controlled based on the detection value of the detection unit (55).

[0039] In the seventeenth aspect, the same effect as in the first aspect can be obtained. [Brief explanation of the drawings]

[0040] [Figure 1] FIG. 1 is a piping diagram of a refrigerant circuit of an air conditioner according to an embodiment. [Figure 2] FIG. 2 is a block diagram showing the relationship between the control unit of the air conditioner and various devices. [Figure 3] FIG. 3 is a schematic diagram showing the internal configuration of the outdoor unit when viewed from above. [Figure 4]FIG. 4 is a flowchart showing the flow of the refrigerant releasing method. [Figure 5] FIG. 5 is a piping diagram corresponding to FIG. 1 of an air conditioner according to Modification 1. In FIG. [Figure 6] FIG. 6 is a diagram showing a schematic diagram of a piping system of a refrigerant circuit of an air conditioner according to Modification 2. In FIG. [Figure 7] FIG. 7 is a diagram showing a schematic diagram of a piping system of a refrigerant circuit of an air conditioner according to Modification 3. In FIG. [Figure 8] FIG. 8 is a schematic diagram showing the internal configuration of the outdoor unit of an air conditioner according to Modification 4, when viewed from above. [Figure 9] FIG. 9 is a schematic diagram showing the internal configuration of the outdoor unit of an air conditioner according to Modification 4, when viewed from the front. [Figure 10] FIG. 10 is a schematic diagram of a refrigerant discharge unit according to another embodiment. [Figure 11] FIG. 11 is a schematic diagram of a refrigerant discharge unit according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0041] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the following embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or its uses. Furthermore, the configurations of the embodiments, modifications, other examples, etc. described below can be combined or partially substituted within the scope of the present invention. In the following description, "upper," "lower," "front," "rear," "right," and "left" refer to the directions shown in Figures 3 and 8-9.

[0042] (1) Air conditioning equipment As shown in FIG. 1 , the air conditioner (10) includes an outdoor unit (20), an indoor unit (30), connecting pipes (12, 13), and a refrigerant discharge unit (U). The air conditioner (10) conditions a target space. The air conditioner (10) performs a heating operation and a cooling operation. The air conditioner (10) is an example of a refrigeration cycle apparatus (10). The refrigerant discharge unit (U) will be described later.

[0043] The air conditioner (10) is a separate type in which an outdoor unit (20) and an indoor unit (30) are connected by two communication pipes (12, 13). The outdoor unit (20) and the indoor unit (30) are connected to each other via the communication pipes (12, 13). This connection forms a refrigerant circuit (11).

[0044] (1-1) Refrigerant circuit The refrigerant circuit (11) performs a refrigeration cycle. The refrigerant circuit (11) is filled with a flammable natural refrigerant. In this embodiment, the refrigerant is carbon dioxide refrigerant. The natural refrigerant has an ozone depletion potential of zero, a low global warming potential, and a low environmental impact.

[0045] The refrigerant circuit (11) is formed by connecting an outdoor circuit (11a) and an indoor circuit (11b) via shut-off valves (46, 47) described later. The outdoor circuit (11a) is provided in the outdoor unit (20). The indoor circuit (11b) is provided in the indoor unit (30).

[0046] A gas side stop valve (46) is connected to the gas side end of the outdoor circuit (11a), and a liquid side stop valve (47) is connected to the liquid side end of the outdoor circuit (11a). The gas side end of the outdoor circuit (11a) is connected to the gas side end of the indoor circuit (11b) via the gas side stop valve (46) and the gas connecting pipe (12). The liquid end of the outdoor circuit (11a) is connected to the liquid side end of the indoor circuit (11b) via the liquid side stop valve (47) and the liquid connecting pipe (13).

[0047] (1-2) The outdoor unit (20) is disposed outdoors. The outdoor unit (20) is an example of a heat source unit. The outdoor unit (20) includes a compressor (21), an outdoor heat exchanger (22), a four-way selector valve (24), and an expansion valve (23), which are connected to the outdoor circuit (11a). The outdoor unit (20) includes an outdoor fan (25).

[0048] (1-3) Compressor The compressor (21) compresses the drawn refrigerant. The compressor (21) discharges the compressed refrigerant. The compressor (21) is a rotary compressor such as a scroll type, a swing piston type, a rolling piston type, or a screw type. The compressor (21) is configured so that its operating frequency (number of rotations) is variable by an inverter device. A discharge pipe (41) is connected to the discharge side of the compressor (21). A suction pipe (42) is connected to the suction side of the compressor (21).

[0049] A discharge pipe (41) and a suction pipe (42) are connected to the compressor (21). High-pressure refrigerant discharged from the compressor (21) flows through the discharge pipe (41). The discharge pipe (41) is an example of a high-pressure line (H). The high-pressure line (H) will be described later.

[0050] The suction pipe (42) passes through which low-pressure refrigerant is drawn into the compressor (21). The suction pipe (42) is an example of a low-pressure line (L), which will be described later.

[0051] (1-4) Outdoor heat exchanger The outdoor heat exchanger (22) is an example of a heat source-side heat exchanger (22). The outdoor heat exchanger (22) exchanges heat between the refrigerant flowing therethrough and outdoor air by means of an outdoor fan (25). The outdoor fan (25) transports outdoor air to the outdoor heat exchanger (22). The outdoor fan (25) is an example of a transport unit (25). The outdoor fan (25) of this embodiment is a propeller fan.

[0052] (1-5) Four-way switching valve The four-way selector valve (24) changes the flow path of the refrigerant circuit (11) to switch between a first refrigeration cycle, which is a cooling cycle, and a second refrigeration cycle, which is a heating cycle. The four-way selector valve (24) switches between a first state shown by a solid line in Fig. 1 and a second state shown by a dashed line in Fig. 1. In the first state, the four-way selector valve (24) connects the discharge side of the compressor (21) to the gas side of the outdoor heat exchanger (22) and also connects the suction side of the compressor (21) to the gas side of the indoor heat exchanger (31). In the second state, the four-way selector valve (24) connects the discharge side of the compressor (21) to the gas side of the indoor heat exchanger (31) and also connects the suction side of the compressor (21) to the gas side of the outdoor heat exchanger (22).

[0053] (1-6) Expansion valve The expansion valve (23) reduces the pressure of the refrigerant. The expansion valve (23) is disposed in the outdoor circuit (11a) between the gas stop valve (46) and the outdoor heat exchanger (22). The expansion valve (23) is an electronic expansion valve whose opening is adjustable.

[0054] (1-7) High-pressure and low-pressure lines The high-pressure line (H) is a refrigerant flow path in the outdoor circuit (11a) through which high-pressure refrigerant flows. Specifically, the high-pressure line (H) is a refrigerant flow path from the discharge pipe (41) of the compressor (21) to the expansion valve (23) in the direction of refrigerant flow. The low-pressure line (L) is a refrigerant flow path in the outdoor circuit (11a) through which low-pressure refrigerant flows. Specifically, the low-pressure line (L) is a refrigerant flow path from the expansion valve (23) to the suction pipe (42) of the compressor (21) in the direction of refrigerant flow.

[0055] (1-8) Indoor unit The indoor unit (30) is installed in the indoor space. The indoor unit (30) has an indoor circuit (11b). The indoor unit (30) includes an indoor fan (32). The indoor heat exchanger (31) exchanges heat between the refrigerant and the indoor air transported by the indoor fan (32).

[0056] (1-9) Sensor The air conditioner (10) includes a plurality of sensors, including a first pressure sensor (51), a second pressure sensor (52), an outdoor air temperature sensor (53), a refrigerant sensor (55), and an indoor temperature sensor (54).

[0057] The first pressure sensor (51) detects the pressure of the refrigerant in the high pressure line (H) of the refrigerant circuit (11). The first pressure sensor (51) is connected to the discharge pipe (41).

[0058] The second pressure sensor (52) detects the pressure of the refrigerant in the low pressure line (L) of the refrigerant circuit (11). The second pressure sensor (52) is connected to the suction pipe (42).

[0059] The outdoor air temperature sensor (53) detects the temperature of the outdoor air outside the target space. The outdoor air temperature sensor (53) is provided in the outdoor unit (20). The outdoor air temperature sensor (53) is disposed near an air inlet (36) of the outdoor unit (20), which will be described later.

[0060] The refrigerant sensor (55) detects the concentration of refrigerant in the air that is discharged to the outside through a first pipe (61) that constitutes a refrigerant discharge unit (U) that will be described later. The refrigerant sensor (55) will be described in detail later.

[0061] The indoor temperature sensor (54) detects the temperature of the indoor air in the indoor space. The indoor temperature sensor (54) is provided in the indoor unit (30).

[0062] (1-10) Remote controller As shown in Fig. 2, the air conditioner (10) has a remote controller (90). A user can operate the remote controller (90) to select an operation mode such as cooling operation, heating operation, or refrigerant discharge operation.

[0063] (1-11) Control unit 2, the air conditioner (10) has an outdoor control unit (C1) and an indoor control unit (C2). The outdoor control unit (C1) and the indoor control unit (C2) are configured to be able to communicate with each other via wire or wirelessly.

[0064] The outdoor control unit (C1) and the indoor control unit (C2) each include an MCU (Micro Controller Unit), an electric circuit, and an electronic circuit. The MCU includes a CPU (Central Processing Unit), a memory, and a communication interface. The memory stores various programs for the CPU to execute.

[0065] The outdoor control unit (C1) is provided in the outdoor unit (20). The outdoor control unit (C1) of the outdoor unit (20) controls the switching between operation and stop of the compressor (21), the rotation speed of the compressor (21), the switching between operation and stop of the outdoor fan (25), the rotation speed of the outdoor fan (25), the opening degree of the expansion valve (23), etc.

[0066] The indoor control section (C2) is provided in the indoor unit (30). The indoor control section (C2) controls switching between operation and stop of the indoor fan (32), the rotation speed of the indoor fan (32), and the like.

[0067] (2) Operation of the air conditioner (2-1) Cooling operation In the cooling operation, the outdoor control unit (C1) sets the four-way selector valve (24) to the first state. In the cooling operation, the outdoor control unit (C1) and the indoor control unit (C2) operate the compressor (21), the outdoor fan (25), and the indoor fan (32), and adjust the opening of the expansion valve (23).

[0068] During the cooling operation, the refrigerant circuit (11) performs a refrigeration cycle (cooling cycle) in which the outdoor heat exchanger (22) functions as a radiator and the indoor heat exchanger (31) functions as an evaporator.

[0069] (2-2) Heating operation In the heating operation, the outdoor control unit (C1) sets the four-way selector valve (24) to the second state. In the heating operation, the outdoor control unit (C1) and the indoor control unit (C2) operate the compressor (21), the outdoor fan (25), and the indoor fan (32), and adjust the opening of the expansion valve (23).

[0070] During the heating operation, the refrigerant circuit (11) performs a refrigeration cycle (heating cycle) in which the indoor heat exchanger (31) functions as a radiator and the outdoor heat exchanger (22) functions as an evaporator.

[0071] (3) Issues with refrigerant release into the atmosphere When an air conditioner having a refrigerant circuit filled with a refrigerant is no longer in use, it may be required to recover the refrigerant from the air conditioner in terms of environmental regulations, etc. However, natural refrigerants with low global warming potential have a relatively low impact on ozone layer depletion and global warming, so it is common practice to release the refrigerant into the atmosphere when the air conditioner is no longer in use.

[0072] Specifically, the refrigerant is directly released into the atmosphere by an operator disconnecting the refrigerant piping or opening a designated service port. However, depending on the location of the outdoor unit or the location where the refrigerant is being released, the concentration of carbon dioxide (the refrigerant) in the air may temporarily increase, which is undesirable for the operator at the work site. Therefore, it is desirable to be able to automatically release the refrigerant from the air conditioner into the atmosphere. To address this issue, the air conditioner (10) of the present disclosure has a refrigerant release unit (U) that releases the refrigerant sealed in the refrigerant circuit (11) into the atmosphere. The refrigerant release unit (U) is disposed in the outdoor unit (20). A detailed description will be given below.

[0073] (4) Outdoor unit configuration As shown in FIG. 3, the outdoor unit (20) has a casing (35) that forms its outer shell. The casing (35) is formed in the shape of a rectangular parallelepiped. An inlet (36) and an outlet (37) are formed in the casing (35). The inlet (36) is formed in the rear surface and the left side surface of the casing (35). The outlet (37) is formed in the front surface of the casing (35). An outlet grill (not shown) is provided in the front surface of the casing (35). The outlet grill covers the outlet (37).

[0074] A machine chamber (S1) and an air passage (S2) are formed in the internal space of the casing (35). The machine chamber (S1) and the air passage (S2) are formed by dividing the internal space of the casing (35) with a partition plate (48).

[0075] The machine room (S1) accommodates the compressor (21) and the like. The air passage (S2) accommodates the outdoor heat exchanger (22) and the outdoor fan (25). The air passage (S2) connects the air inlet (36) and the air outlet (37). Air flows through the air passage (S2) from the air inlet (36) toward the air outlet (37). The thick arrows in FIG. 3 indicate the direction of air flow.

[0076] The outdoor heat exchanger (22) is L-shaped in plan view (here, when the outdoor unit is viewed from above). The outdoor heat exchanger (22) is provided along the back surface and left side surface of the casing (35) and faces the air inlet (36). The outdoor fan (25) is provided in the air passage (S2) downstream of the air flow of the outdoor heat exchanger (22). The outdoor fan (25) is rotatably connected to a fan motor (not shown).

[0077] (5) Refrigerant release unit The refrigerant discharge unit (U) discharges the refrigerant sealed in the refrigerant circuit (11) into the atmosphere. The refrigerant discharge unit (U) includes a first pipe (61), a control valve (62), a refrigerant sensor (55), and an outdoor control unit (C1). The outdoor control unit (C1) is an example of the control unit (C1) of the present disclosure. In other words, the outdoor control unit (C1) of the air conditioner (10) also serves as the control unit (C1) of the refrigerant discharge unit (U).

[0078] As shown in FIG. 1 , the first pipe (61) is connected to the refrigerant circuit (11). The first pipe (61) is an example of a flow path (61) for discharging the refrigerant sealed in the refrigerant circuit (11) to the outside. One end of the first pipe (61) is connected to the refrigerant circuit (11). In this embodiment, the first pipe (61) is connected to the discharge pipe (41), which is the high-pressure line (H). The other end of the first pipe (61) is open to the outside (outside the room).

[0079] As shown in FIG. 3 , the first pipe (61) has a discharge port (61a) for discharging the refrigerant to the outside. The discharge port (61a) of this embodiment is arranged in the air passage (S2). The first pipe (61) of this embodiment extends from the discharge pipe (41) of the compressor (21) arranged in the machine room (S1) to the air passage (S2) via the partition plate (48). The discharge port (61a) only needs to be arranged in the air passage (S2) and is arranged downstream of the outdoor fan (25) in the air flow direction. The discharge port (61a) may also be arranged upstream of the outdoor fan (25).

[0080] The control valve (62) is connected to the first pipe (61). The control valve (62) adjusts the flow rate of the refrigerant flowing through the first pipe (61) by adjusting the opening degree of the control valve (62). The control valve (62) is an electronic expansion valve. The control valve (62) is an example of the valve (62).

[0081] The refrigerant sensor (55) detects the refrigerant discharged to the outside from the first pipe (61). Specifically, the refrigerant sensor (55) detects the concentration of the refrigerant in the air discharged from the discharge port (61a). The refrigerant sensor (55) is preferably capable of detecting a refrigerant concentration in the air of 3% or less (carbon dioxide in this embodiment). The refrigerant sensor (55) is preferably capable of detecting when the refrigerant concentration in the air (carbon dioxide in this embodiment) is 0.5% or more and reaches 1.0%. The refrigerant sensor (55) is an example of a detection unit.

[0082] The refrigerant sensor (55) is arranged in the air passage (S2). Specifically, the refrigerant sensor (55) is arranged downstream of the outdoor fan (25) in the air flow direction.

[0083] The outdoor control unit (C1) is connected to the regulating valve (62) and the refrigerant sensor (55) so as to be able to communicate with them (see FIG. 2). The outdoor control unit (C1) controls the opening degree of the regulating valve (62). Specifically, the outdoor control unit (C1) adjusts the opening degree of the regulating valve (62) based on the refrigerant concentration detected by the refrigerant sensor (55). The refrigerant concentration is an example of a detected value.

[0084] (6) Refrigerant release method A refrigerant discharging method for discharging refrigerant from the air conditioner (10) of this embodiment will be described. The refrigerant discharging method of this embodiment adjusts the opening of the control valve (62) based on the refrigerant concentration in the air, which is the value detected by the refrigerant sensor (55). The flow of the discharging method of this embodiment will be specifically described with reference to FIG. 4.

[0085] In step S11, the outdoor control section (C1) determines whether or not a signal to execute the discharge operation has been received from the remote controller (90). The discharge operation is an operation for executing the discharge method of this embodiment. If it is determined that a signal to start the discharge operation has been received (YES in step S11), the discharge operation is started. If it is determined that a signal to start the discharge operation has not been received (NO in step S11), the discharge operation is not executed and this flow ends.

[0086] In step S12, the outdoor control section (C1) starts the operation of the outdoor fan (25). The outdoor control section (C1) sets the rotation speed of the outdoor fan (25) to the maximum.

[0087] In step S13, the outdoor control unit (C1) starts the operation of the compressor (21). At this time, the outdoor control unit (C1) switches the four-way selector valve (24) to the first state and fully opens the expansion valve (23). The outdoor control unit (C1) also appropriately opens and closes the shut-off valves (46, 47) so that the refrigerant sealed in the refrigerant circuit (11) moves to the outdoor circuit (11a). For example, by closing the liquid shut-off valve <47>, the refrigerant moves to the high-pressure line (H) and the outdoor circuit (11a).

[0088] In step S14, the outdoor control section (C1) determines whether or not the first pressure value detected by the first pressure sensor (51) is equal to or greater than a first value. In other words, the outdoor control section (C1) determines whether or not the discharge pressure of the refrigerant from the compressor (21) is equal to or greater than a first value. If it is determined that the first pressure value is equal to or greater than the first value (YES in step S14), step S15 is executed. If it is determined that the first pressure value is less than the first value (NO in step S14), step S16 is executed. The first value is set based on, for example, the design pressure of the compressor (21).

[0089] In step S15, the outdoor control section (C1) stops the operation of the compressor (21), and then step S18 is executed.

[0090] In step S16, the outdoor control section (C1) determines whether the second pressure value detected by the second pressure sensor (52) is equal to or less than the second value. In other words, the outdoor control section (C1) determines whether the suction pressure of the refrigerant sucked into the compressor (21) is equal to or less than the second value. The second value is set, for example, based on the suction pressure of the refrigerant when the refrigerant remaining in the indoor circuit (11b) moves to the outdoor circuit (11a). If it is determined that the second pressure value is equal to or less than the second value (YES in step S16), step S17 is executed. If it is determined that the second pressure value is higher than the second value (NO in step S16), step S14 is executed again.

[0091] In step S17, the outdoor control section (C1) stops the compressor (21).

[0092] In step S18, the outdoor control section (C1) opens the control valve (62) to an initial setting of the opening degree. As a result, the refrigerant is discharged to the outside through the discharge port (61a) via the first pipe (61). The initial setting of the opening degree is set by the outdoor control section (C1). The outdoor control section (C1) sets the initial setting of the opening degree so that the refrigerant concentration detected by the refrigerant sensor (55) is lower than a value corresponding to QLMV (kg / m^3), which is the carbon dioxide concentration limit for minimum ventilation. Specifically, the initial setting of the opening degree is set based on the outside air temperature and the pressure of the refrigerant flowing through the first pipe (61). In the present embodiment, the pressure of the refrigerant flowing through the first pipe (61) is the first pressure value detected by the first pressure sensor (51).

[0093] In step S19, the outdoor control section (C1) controls the opening of the regulating valve (62) so that the detected value of the refrigerant sensor (55) becomes lower than the value corresponding to QLMV (kg / m^3) in step S18.

[0094] In step S20, the outdoor control section (C1) determines whether the first pressure difference, which indicates the difference between the first pressure value in step S17 before the control valve (62) was opened and the current first pressure value, is equal to or greater than a third value. A larger first pressure difference is preferable because the current first pressure value becomes smaller. This is because a larger first pressure difference is considered to represent a smaller amount of refrigerant remaining in the refrigerant circuit (11). In other words, the third value is preferably the first pressure difference in step S17 or a value closer to the first pressure difference. If it is determined that the first pressure difference is equal to or greater than the third value (YES in step S20), step S21 is executed. If it is determined that the first pressure difference is less than the third value (NO in step S20), step S21 is executed.

[0095] In step S21, the outdoor control section (C1) closes the control valve (62), thereby ending the refrigerant release operation.

[0096] In step S22, the outdoor control section (C1) determines whether the second pressure value detected by the second pressure sensor (52) is equal to or less than the second value. In other words, the outdoor control section (C1) determines whether the suction pressure of the air drawn into the compressor (21) is equal to or less than the second value. If it is determined that the second pressure value is equal to or less than the second value (YES in step S16), step S13 is executed. If it is determined that the second pressure value is higher than the second value (NO in step S16), the discharge operation is stopped.

[0097] (7) Features (7-1) Feature 1 The refrigerant discharge unit (U) of this embodiment includes a first pipe (61) connected to the refrigerant circuit (11) for discharging the refrigerant sealed in the refrigerant circuit (11) to the outside, a control valve (62) for adjusting the opening degree of the first pipe (61), and an outdoor control unit (C1) for controlling the control valve (62).

[0098] The flow rate of the refrigerant released into the atmosphere can be adjusted by controlling the valve (62). This prevents the refrigerant from stagnating when the refrigerant is released into the atmosphere, which would otherwise increase the refrigerant concentration. As a result, the refrigerant can be released from the flow path (61) while keeping the refrigerant concentration in the air at or below a predetermined value. Furthermore, this eliminates the need for additional components such as a release hose, thereby reducing the workload involved in releasing the refrigerant.

[0099] (7-2) Feature 2 The refrigerant used in this embodiment is a natural refrigerant. When the refrigerant sealed in the refrigerant circuit (11) of the air conditioner (10) is a natural refrigerant, the refrigerant may be released into the atmosphere when the air conditioner (10) is no longer in use. Even in such a case, the refrigerant release unit (U) of this embodiment can be used to suppress the concentration of the refrigerant released into the atmosphere to a predetermined value or less.

[0100] (7-3) Feature 3 The refrigerant in this embodiment is carbon dioxide. By using the refrigerant discharge unit (U) of this embodiment, it is possible to suppress an increase in the carbon dioxide concentration in the air around the outdoor unit (20) in which the first pipe (61) is arranged when the refrigerant is discharged. This prevents, for example, a worker near the outdoor unit (20) from inhaling air with a high carbon dioxide concentration.

[0101] (7-4) Feature 4 The refrigerant discharge unit (U) of this embodiment includes a refrigerant sensor (55) that detects the refrigerant discharged to the outside. The refrigerant sensor (55) detects the concentration of refrigerant in the air. This makes it possible to recognize the concentration of refrigerant discharged from the air conditioner (10).

[0102] (7-5) Feature 5 The outdoor control unit (C1) of this embodiment adjusts the opening of the adjustment valve (62) based on the refrigerant concentration detected by the refrigerant sensor (55). In this way, for example, by controlling the valve (62) so that the release rate of the refrigerant is slower than the diffusion rate of the refrigerant into the atmosphere, the concentration of the released refrigerant can be kept below a predetermined concentration.

[0103] (7-6) Feature 6 The outdoor control unit (C1) of this embodiment controls the aperture of the adjustment valve (62) so that the refrigerant concentration detected by the refrigerant sensor (55) becomes lower than a value corresponding to QLMV (kg / m^3), which is the concentration limit for minimum ventilation of carbon dioxide. This prevents the carbon dioxide refrigerant released from the first pipe (61) from becoming higher than QLMV.

[0104] (7-7) Feature 7 The first pipe (61) of the refrigerant discharge unit (U) of this embodiment is connected to the discharge pipe (41). This allows the refrigerant to be discharged from the air conditioner (10) to the outside through the first pipe (61) without operating the compressor (21). As a result, it is possible to prevent the refrigerant from remaining in the refrigerant circuit (11).

[0105] (7-8) Feature 8 In this embodiment, the discharge port (61a) of the first pipe (61) is arranged in the air passage (S2) that connects the inlet (36) and the outlet (37) in the internal space of the casing (35) of the outdoor unit (20). As a result, the refrigerant discharged from the discharge port (61a) is discharged to the outside of the outdoor unit (20) through the outlet (37) by air flowing through the air passage (S2).

[0106] (7-9) Feature 9 The refrigerant sensor (55) of this embodiment is disposed in the air passage (S2) downstream of the outdoor fan (25) in the air flow direction. The air downstream of the outdoor fan (25) is blown and diffused to the outside by the operation of the outdoor fan (25). Therefore, the refrigerant concentration in the air at the position of the refrigerant sensor (55) decreases toward the downstream of the air flow direction. Therefore, by controlling the adjustment valve (62) based on the refrigerant concentration at the position of the refrigerant sensor (55), it is possible to prevent refrigerant having a predetermined concentration or higher from being released to the outside.

[0107] (8) Variations A modification of the refrigerant discharge unit (U) of the above embodiment will be described below. Note that only the configurations different from the above embodiment will be described below.

[0108] (8-1) Variation 1 As shown in Fig. 5, the first pipe (61) of the refrigerant discharge unit (U) of the first modification is connected to the suction pipe (42) connected to the compressor (21). In the first modification, the first pipe (61) is connected to the low-pressure line (L). In this case, step S17 does not have to be executed in the discharge operation. That is, the compressor (21) may be operated. By operating the compressor (21), the refrigerant can be discharged to the outside through the first pipe (61) even from the low-pressure line (L).

[0109] (8-2) Variation 2 As shown in Fig. 6, the air conditioner (10) of the second modification includes a refrigerant circuit (11) in which a compressor (21), a radiator (28), a receiver (71), an expansion valve (23), and an evaporator (29) are connected in this order. The refrigerant discharged from the compressor (21) radiates heat in the radiator (28). The refrigerant decompressed by the expansion valve (23) evaporates in the evaporator (29).

[0110] The receiver (71) is connected to the high-pressure line (H). Specifically, the receiver (71) is connected between the radiator (28) and the evaporator (29) in the refrigerant circuit (11). The receiver (71) is an example of the liquid receiver (71) of the present disclosure.

[0111] When the air conditioner (10) starts operating, the high-pressure refrigerant compressed by the compressor (21) is discharged into the discharge pipe (41) and then dissipates heat through heat exchange in the radiator (28). The refrigerant then passes through the receiver (71) and is reduced in pressure by the expansion valve (23). The reduced-pressure refrigerant is evaporated through heat exchange in the evaporator (29) and is then sucked back into the compressor (21) as low-pressure refrigerant through the suction pipe (42).

[0112] In the second modification, the refrigerant is released through a receiver (71) connected to the high-pressure line (H). As a result, like the release operation, even if the operation of the compressor (21) is stopped in step S17, the refrigerant can be released through the receiver (71).

[0113] (8-3) Variation 3 As shown in Fig. 7, the refrigerant circuit (11) of the air conditioner (10) of the third modification includes a first compressor (21a), a second compressor (21b), a radiator (28), a first expansion valve (23a), a receiver (71), a second expansion valve (23b), and an evaporator (29) connected in this order. The refrigerant circuit (11) of the third modification includes an injection flow path (65). The injection flow path (65) connects the receiver (71) to the refrigerant flow path between the first compressor (21a) and the second compressor (21b). The injection flow path (65) allows gas refrigerant in the receiver (71) to flow into the refrigerant flow path between the first compressor (21a) and the second compressor (21b).

[0114] The refrigerant circuit (11) of the third modification is a so-called two-stage compression refrigerant circuit in which a refrigerant is compressed by a first compressor (21a) and then further compressed by a second compressor (21b). The first compressor (21a) compresses low-pressure refrigerant and discharges intermediate-pressure refrigerant. The second compressor (21b) compresses the intermediate-pressure refrigerant and discharges high-pressure refrigerant.

[0115] In the refrigerant circuit (11) of the third modification, the first expansion valve (23a) reduces the pressure of high-pressure refrigerant to an intermediate pressure. The second expansion valve (23b) reduces the pressure of intermediate-pressure refrigerant to a low pressure. The intermediate-pressure refrigerant flows through the receiver (71). That is, the receiver (71) is connected to an intermediate-pressure line, which will be described later.

[0116] The refrigerant circuit (11) of the third modification has an intermediate-pressure line (M). The intermediate-pressure line (M) is a refrigerant flow path through which intermediate-pressure refrigerant flows. The intermediate-pressure line (M) is provided in the outdoor circuit (11a). Specifically, the intermediate-pressure line (M) is a refrigerant flow path between the first compressor (21a) and the second compressor (21b), a refrigerant flow path between the first expansion valve (23a) and the second expansion valve (23b), and an injection flow path. The refrigerant flow path between the first compressor (21a) and the second compressor (21b) is a discharge pipe of the first compressor (21a) and a suction pipe of the second compressor (21b).

[0117] When the air conditioner (10) starts operating, the intermediate-pressure refrigerant compressed by the first compressor (21a) is compressed by the second compressor (21b) to become high-pressure refrigerant and is discharged to the discharge pipe (41). The high-pressure refrigerant is heat-exchanged in the radiator (28) to dissipate heat, and then is reduced in pressure by the first expansion valve (23a) to become intermediate-pressure refrigerant. The intermediate-pressure refrigerant passes through the receiver (71) and is further reduced in pressure by the second expansion valve (23b). The reduced-pressure refrigerant is evaporated by heat exchange in the evaporator (29), and is then sucked back into the compressor (21) as low-pressure refrigerant via the suction pipe (42).

[0118] The first pipe (61) of the third modification is connected to the receiver (71). In other words, the first pipe (61) is connected to the intermediate-pressure line (M). In this manner, the refrigerant is released to the outside through the receiver (71) connected to the intermediate-pressure line (M). The release of the refrigerant may be performed after the operation of the compressor (21) is stopped in step S17, as in the above-described release operation. Alternatively, the release of the refrigerant may be performed while the compressor (21) is operating. This increases the rate at which the refrigerant is released into the atmosphere. Alternatively, the first pipe (61) may be connected to a refrigerant pipe connecting the discharge side of the first compressor (21a) and the suction side of the second compressor (21b), or may be connected to the injection flow path (65).

[0119] (8-4) Variation 4 In the fourth modification, the outdoor unit (20) has a different configuration from the outdoor unit (20) in the above embodiment and the above modifications. This will be described in detail below.

[0120] As shown in Figures 8 and 9, the casing (35) of the outdoor unit (20) has a generally vertically elongated rectangular parallelepiped shape. The casing (35) has a front panel (81), a left side panel (82), a right side panel (83), a rear panel (84), a top panel (85), and a bottom panel (86). An intake port (36) is formed in each of the front panel (81), the left side panel (82), and the right side panel (83). An outlet port (37) is formed in the top panel (85). Air drawn into the intake port (36) flows upward through the internal space of the casing (35) and is blown out through the outlet port (37). In this way, an air passage (S2) extending in the vertical direction is formed in the internal space of the casing (35).

[0121] The internal space of the casing (35) is divided into an upper space (P1) and a lower space (P2). The upper space (P1) accommodates an outdoor fan (25). The lower space (P2) accommodates an outdoor heat exchanger (22) and a machine room (S1). The machine room (S1) is disposed on the bottom panel (86). The machine room (S1) accommodates the compressor (21), expansion valve (23), etc. The compressor (21), etc. are accommodated in the internal space of the accommodation section (93).

[0122] In the lower space (P2), the outdoor heat exchanger (22) is disposed to face the air inlet (36). In other words, the outdoor heat exchanger (22) is disposed along the three side panels (81, 82, 83) on which the air inlet (36) is formed. The outdoor heat exchanger (22) is formed in a U-shape when the outdoor unit (20) is viewed from above.

[0123] The air passage (S2) has an upper space (P1) and a lower space (P2). Strictly speaking, the air passage (S2) is formed by the upper space (P1) and the lower space (P2) excluding the machine room (S1). Air drawn in through the suction port (36) flows into the upper space (P1) through the lower space (P2). Air is blown out from the upper space (P1) through the air outlet (37).

[0124] The first pipe (61) of the refrigerant discharge unit (U) extends upward from the machine chamber (S1) toward the air passage (S2). The discharge port (61a) is located above the machine chamber (S1) and in the lower space (P2).

[0125] The refrigerant sensor (55) is arranged in the upper space (P1) downstream of the outdoor fan (25) in the air flow direction. The refrigerant sensor (55) may be arranged at the air outlet (37).

[0126] (9) Other embodiments The above embodiment may be configured as follows.

[0127] The natural refrigerant filled in the refrigerant circuit (11) may be a flammable refrigerant. In this case, the refrigerant may be propane or ammonia (R717). Alternatively, the refrigerant may be methane (R50), ethane (R170), butane (R600), or isobutane (R600a), which are highly flammable natural refrigerants.

[0128] When the natural refrigerant filled in the refrigerant circuit (11) is a flammable refrigerant, in steps S18 and S19 of the refrigerant discharging method of the above embodiment, the outdoor control unit (C1) may control the adjustment valve (62) so that the refrigerant concentration detected by the refrigerant sensor (55) becomes lower than a value corresponding to the LFL (%), which is the lower flammability limit of the flammable refrigerant.

[0129] 10, the refrigerant discharge unit (U) may have a sealing part (94) that seals the discharge port (61a). The sealing part (94) is detachable from the discharge port (61a). The sealing part (94) prevents the refrigerant in the refrigerant circuit (11) from leaking out through the discharge port (61a) when the refrigerant discharge unit (U) is not in use.

[0130] As shown in FIG. 11, the control valve (62) may be provided at the outlet (61a).

[0131] The control unit (C1) of the present disclosure is not limited to the outdoor control unit (C1) and may be an indoor control unit (C2). The control unit (C1) of the present disclosure may also be a control device configured separately from the air conditioning apparatus (10). This control device includes a device that is wirelessly connected via a predetermined server.

[0132] In the above embodiment, when the release operation is performed, step S17 does not have to be performed. That is, the compressor (21) may be operated in step S17. This allows the refrigerant to be released to the outside through the first pipe (61) relatively quickly.

[0133] In the above embodiment and Modification 4, the refrigerant sensor (55) may be disposed downstream of the outdoor fan (25) and may not be disposed in the air passage (S2). For example, the refrigerant sensor (55) may be disposed at the outlet (37) or at a position outside the casing (35) facing the outlet (37). Furthermore, a plurality of refrigerant sensors (55) may be disposed.

[0134] In the above embodiment and modification 4, the refrigerant sensor (55) may be arranged in the air passage (S2) upstream of the air flow of the outdoor fan (25).

[0135] In the fourth modification, the refrigerant sensor (55) may be disposed in the suction port (36). A plurality of refrigerant sensors (55) may be disposed, for example, in the suction ports (36) formed in two or more of the side panels (81, 82, 83).

[0136] In the fourth modification, the refrigerant sensor (55) does not have to be arranged in the air passage (S2). The refrigerant sensor (55) may be arranged outside the casing (35) at a position facing the suction port (36).

[0137] The refrigerant sensor (55) may be located near the discharge port (61a). The closer the refrigerant sensor (55) is to the discharge port (61a), the more it can detect the refrigerant concentration immediately after discharge from the discharge port (61a). Specifically, the refrigerant sensor (55) is located preferably within 300 mm, more preferably in the range of 100 to 300 mm, and even more preferably in the range of 200 to 300 mm, from the discharge port (61a). In this way, the refrigerant sensor (55) detects the refrigerant concentration at the discharge port (61a) or in the air at a position relatively close to the discharge port (61a).

[0138] In the above embodiment, the first pipe (61) only needs to be connected to the high-pressure line (H), and does not necessarily have to be connected to the discharge pipe (41).

[0139] In the first modification, the first pipe (61) only needs to be connected to the low-pressure line (L), and does not necessarily have to be connected to the suction pipe (42).

[0140] In the air conditioner (10) of the second modified example, the first pipe (61) does not need to be connected to the receiver (71) but may be connected to the high-pressure line (H) or the low-pressure line (L). For example, the first pipe (61) may be connected to the discharge pipe (41) of the compressor (21) or to the suction pipe (42) of the compressor (21).

[0141] In the third modification, the first pipe (61) is only required to be connected to the intermediate-pressure line (M), and is not necessarily connected to the receiver (71). The first pipe (61) may be connected to the discharge pipe (41) of the second compressor (21b), which is the high-pressure line (H), or may be connected to the suction pipe (42) of the first compressor (21a), which is the low-pressure line (L).

[0142] The refrigerant discharge unit (U) may be configured separately from the air conditioner (10). In this case, the control unit (C1) of the refrigerant discharge unit (U) is separate from the outdoor control unit (C1) provided in the air conditioner (10). In the discharge operation, the control unit (C1) of the refrigerant discharge unit (U) may output a command to the outdoor control unit (C1) to control the operation of the compressor (21) and the outdoor fan (25), or the control unit (C1) may directly control the operation of the compressor (21) and the outdoor fan (25). The first pipe (61) may be connected to a predetermined connection part of the refrigerant circuit (11). The predetermined connection part may be, for example, a service port provided in the refrigerant pipe or the stop valves (46, 47). In this manner, the refrigerant discharge unit (U) can be retrofitted to an existing air conditioner (10).

[0143] The refrigeration cycle apparatus (10) is not limited to the air conditioner (10), but may be any apparatus that is equipped with the refrigerant circuit (11) of the above embodiment and the above modifications and is capable of performing a refrigeration cycle operation.

[0144] In the above embodiment, the expansion valve (23) may be provided in the indoor unit (30). That is, the expansion valve (23) may be provided in the indoor circuit (11b).

[0145] The detection unit (55) is not limited to a refrigerant sensor as long as it can detect the refrigerant. The detected value may be an index related to the refrigerant detected by the refrigerant sensor (55). For example, the detected value may be an index indicating the refrigerant concentration.

[0146] The transfer section (25) may be any device that creates an air flow, such as a turbofan or a sirocco fan.

[0147] Although the embodiments and modifications have been described above, it will be understood that various modifications in form and detail are possible without departing from the spirit and scope of the claims. Furthermore, the above embodiments and modifications may be combined or substituted as appropriate as long as the functionality of the subject matter of this disclosure is not impaired. The terms "first," "second," etc., described above, are used to distinguish the terms to which these terms are attached, and do not limit the number or order of the terms. [Industrial Applicability]

[0148] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for a refrigerant discharging unit, a refrigeration cycle device, and a refrigerant discharging method. [Explanation of symbols]

[0149] 10 Refrigeration cycle equipment (air conditioning equipment) 11 Refrigerant circuit 20 Outdoor unit (heat source unit) 21 Compressor 22 Outdoor heat exchanger (heat source side heat exchanger) 25 Outdoor fan (transport section) 35 Casing 55 Refrigerant sensor (detection unit) 61 First pipe (flow path) 61a Outlet 62 Control valve (valve) 71 Receiver 94 Sealing part C1 First control section (control section) H High pressure line L Low pressure line M Intermediate pressure line S2 air passage U Refrigerant Discharge Unit

Claims

1. A refrigerant discharge unit that discharges refrigerant sealed in a refrigerant circuit (11) that performs a refrigeration cycle, a flow path (61) connected to the refrigerant circuit (11) for discharging the refrigerant sealed in the refrigerant circuit (11) to the outside; a valve (62) disposed in the flow path (61) and having an adjustable opening; a control unit (C1) for controlling the opening degree of the valve (62). Refrigerant release unit.

2. The refrigerant is a natural refrigerant 10. The refrigerant discharge unit of claim 1.

3. The refrigerant is carbon dioxide 3. The refrigerant discharge unit of claim 2.

4. a detector (55) for detecting the refrigerant discharged from the flow path (61) to the outside; 4. A refrigerant discharge unit according to claim 1.

5. The flow path (61) has a discharge port (61a) through which the refrigerant is discharged to the outside, The detection section (55) is disposed near the discharge port (61a).

5. The refrigerant discharge unit of claim 4.

6. The control section (C1) adjusts the opening of the valve (62) based on the value detected by the detection section (55).

5. The refrigerant discharge unit of claim 4.

7. the refrigerant is carbon dioxide; The detection unit detects the concentration of the refrigerant, The control section (C1) controls the opening of the valve (62) so that the concentration of the refrigerant detected by the detection section (55) becomes lower than a value corresponding to QLMV (kg / m^3), which is the concentration limit for minimum ventilation of carbon dioxide.

7. The refrigerant discharge unit of claim 6.

8. The refrigerant is a flammable refrigerant, The detection unit detects the concentration of the refrigerant, The control section (C1) controls the concentration of the refrigerant detected by the detection section (55) so that the concentration becomes lower than a value corresponding to LFL (%), which is the lower flammability limit of the flammable refrigerant.

7. The refrigerant discharge unit of claim 6.

9. The flow path (61) has a discharge port (61a) through which the refrigerant is discharged to the outside, a sealing portion (94) for sealing the discharge port (61a).

4. A refrigerant discharge unit according to claim 1.

10. A refrigeration cycle device comprising the refrigerant discharge unit (U) according to any one of claims 1 to 3 and the refrigerant circuit (11).

11. The flow path (61) is connected to a high-pressure line (H) through which a high-pressure refrigerant of the refrigerant circuit (11) flows. The refrigeration cycle device according to claim 10.

12. The refrigerant circuit (11) further includes a liquid receiver (71) connected to an intermediate pressure line (M) through which an intermediate pressure refrigerant flows or a high pressure line (H) through which a high pressure refrigerant flows, and the flow path (61) is connected to the liquid receiver (71). The refrigeration cycle device according to claim 10.

13. The flow path (61) is connected to an intermediate pressure line (M) through which an intermediate pressure refrigerant flows in the refrigerant circuit (11). The refrigeration cycle device according to claim 10.

14. The flow path (61) is connected to a low-pressure line (L) in the refrigerant circuit (11) through which a low-pressure refrigerant flows. The refrigeration cycle device according to claim 10.

15. a heat source unit (20) disposed outdoors; The heat source unit (20) a compressor (21) and a heat source side heat exchanger (22) connected to the refrigerant circuit (11); a casing (35) that accommodates the compressor (21), the heat source side heat exchanger (22), and a transfer section (25) that transfers outside air to the heat source side heat exchanger (22), An air passage (S2) through which the air transported by the transport part (25) flows is formed in the casing (35), The flow path (61) has a discharge port (61a) through which the refrigerant is discharged, The outlet (61a) is disposed in the air passage (S2). The refrigeration cycle device according to claim 10.

16. The heat source unit (20) further includes a detector (55) that detects the refrigerant discharged from the discharge port (61a), The detection section (55) is disposed downstream of the transfer section (25) in the air flow direction in the air passage (S2). The refrigeration cycle device according to claim 15.

17. a refrigerant circuit (11) for performing a refrigeration cycle; a flow path (61) connected to the refrigerant circuit (11) and having a discharge port (61a) for discharging the refrigerant to the outside; a valve (62) disposed in the flow path (61) and having an adjustable opening; a detection unit disposed near the discharge port (61 a) and configured to detect the refrigerant discharged from the discharge port (61 a), The opening degree of the valve (62) is controlled based on the detection value of the detection section (55). Release method.

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