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

Abstract

To decrease the concentration of a combustible refrigerant discharged outdoors.SOLUTION: A refrigerant discharge unit (U) is applied to a refrigeration cycle device (10) comprising: a first refrigerant circuit (40) comprising a first compressor (42), and for performing a refrigeration cycle by using a first refrigerant containing a combustible refrigerant; and a second refrigerant circuit (60) comprising a second compressor (62), and for performing a refrigeration cycle by using a second refrigerant containing carbon dioxide. The refrigerant discharge unit (U) comprises a tank (70), a first flow passage (81) connecting the first refrigerant circuit (40) and the tank (70), a first valve (75) provided in the first flow passage (81), a second flow passage (82) connecting the second refrigerant circuit (60) and the tank (70), a second valve (76) provided in the second flow passage (82), and a third flow passage (83) for establishing communication between a space in the tank (70) and an outdoor space.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Patent Document 1 describes a refrigeration cycle in which a refrigeration cycle is performed using a refrigerant circuit that uses a flammable refrigerant. Such flammable refrigerants are sometimes disposed of by being released outdoors. . [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7162786 Summary of the Invention [Problem to be solved by the invention]

[0004] In the refrigeration cycle device of Patent Document 1, the concentration of the flammable refrigerant released outdoors may become high. There is a possibility.

[0005] The present disclosure aims to reduce the concentration of flammable refrigerant released outdoors. [Means for solving the problem]

[0006] The first aspect is directed to a refrigerant discharging unit. The refrigerant discharging unit (U) is a first refrigerant The present invention is applied to a refrigeration cycle apparatus (10) including a first refrigerant circuit (40) and a second refrigerant circuit (60). The first refrigerant circuit (40) has a first compressor (42) and refrigerates using a first refrigerant containing a flammable refrigerant. The second refrigerant circuit (60) has a second compressor (62) and is configured to circulate a first refrigerant containing carbon dioxide. The refrigeration cycle is carried out using two refrigerants.

[0007] The refrigerant discharge unit includes a tank (70), the first refrigerant circuit (40), and the tank (70). a first flow path (81) connecting the first and second valves (75) provided in the first flow path (81); a second flow path (82) connecting the second refrigerant circuit (60) and the tank (70); a second valve (76) provided in the tank (70) and a valve (77) for connecting the space in the tank (70) with the outdoor space; and a third flow path (83).

[0008] In the first mode, the first valve (75) is opened, and the first refrigerant in the first refrigerant circuit (40) is The refrigerant flows into the tank (70) through the flow path (81). When the second valve (76) is opened, the refrigerant flows into the second refrigerant circuit (70). The second refrigerant (60) flows into the tank (70) through the second flow path (82). The first solvent is mixed in the tank (70), and the first solvent is mixed in the mixed fluid in the tank (70). The concentration of the refrigerant decreases. The fluid in the tank (70) is discharged to the outside through the third flow path (83). As a result, the concentration of the first refrigerant in the fluid discharged outdoors can be reduced.

[0009] In a second aspect, the third valve (77) provided in the third flow path (83) in the first aspect is Prepare further.

[0010] In the second embodiment, the third valve (77) provided in the third flow path (83) is closed to allow the tank (70 ) can be stored in the tank (70). In addition, the third valve (77) is opened. This allows the mixed fluid to be discharged outside the room.

[0011] The third embodiment is the second embodiment, wherein the first valve (75), the second valve (76), and the The third valve (77) is controlled by the control section (C).

[0012] In a third embodiment, the first valve (75), the second valve (76), and the third valve (77) are connected to a control unit (C) As a result, the first and second refrigerants can be automatically mixed. In addition, the mixed fluid can be automatically discharged outside the room.

[0013] In a fourth embodiment, in the third embodiment, the control unit (C) opens the first valve (75). a first operation of sending the first refrigerant in the first refrigerant circuit to the tank in a state; With the second valve (76) open, the second refrigerant in the second refrigerant circuit (60) is supplied to the tank (70 ), and a second operation of sending the first refrigerant and the second refrigerant to the third valve (77) while the third valve (77) is open. and a third operation of discharging the mixed fluid from the tank (70) to the outside of the room.

[0014] In the fourth embodiment, in the first operation, the refrigerant in the first refrigerant circuit (40) is sent to the tank (70). In the second operation, the refrigerant in the second refrigerant circuit (60) is sent to the tank (70). In the third operation, the mixed fluid in the tank (70) can be discharged to the outside.

[0015] In a fifth aspect, in the fourth aspect, the first action is to open the first valve (75) and With the second valve (76) closed, the first refrigerant in the first refrigerant circuit (40) is supplied to the tank (70). The second operation is a sending operation, and the second operation is to open the second valve (76) and close the first valve (75). the second refrigerant in the second refrigerant circuit (60) is sent to the tank (70) in this state, The control unit (C) causes the second operation to be executed after the first operation.

[0016] In a fifth aspect, the second refrigerant circuit (60) uses a second refrigerant containing carbon dioxide. Generally, the pressure in the refrigerant circuit that uses carbon dioxide for the refrigeration cycle is The pressure in the refrigerant circuit is higher than that in the refrigeration cycle that uses a flammable refrigerant. In the case where the first action is performed after the second action, or the first action and the second action are performed simultaneously, The first refrigerant, which has a lower pressure than the second refrigerant, is less likely to enter the tank (70). In this embodiment, the first operation is performed before the second operation, so that the first refrigerant having a low pressure is stored in the tank. After the second refrigerant is sent to the tank (70), the second refrigerant at a higher pressure can be sent to the tank (70). This makes it easier to send both the first refrigerant and the second refrigerant to the tank (70).

[0017] A sixth aspect is the fourth or fifth aspect, wherein the control unit (C) controls the first compressor The first operation is performed while the second compressor (42) is operating, or the first operation is performed while the second compressor (62) is operating. The second operation is performed.

[0018] In the sixth aspect, the pressure in the first refrigerant circuit (40) is increased by operating the first compressor (42). As a result, the difference between the pressure in the first refrigerant circuit (40) and the pressure in the tank (70) increases. As a result, in the first action, the first refrigerant in the first refrigerant circuit (40) can be easily sent to the tank (70). Alternatively, the pressure in the second refrigerant circuit (60) increases when the second compressor (62) is operated. The difference between the pressure in the second refrigerant circuit (60) and the pressure in the tank (70) increases. In operation, the second refrigerant in the second refrigerant circuit (60) can be easily sent to the tank (70).

[0019] In a seventh aspect, in the sixth aspect, the control unit (C) is The second refrigerant circuit (60) is configured so that the high pressure of the second refrigerant circuit (60) is equal to or higher than the critical pressure. Control.

[0020] In a seventh aspect, the control unit (C) controls the second refrigerant so that the high pressure of the second refrigerant is equal to or higher than the critical pressure. Since the second refrigerant circuit (60) is controlled, the pressure in the second refrigerant circuit (60) can be further increased. As a result, the second refrigerant in the second refrigerant circuit (60) can be more easily sent to the tank (70).

[0021] In an eighth aspect, in the third to seventh aspects, the pre-existing gas discharged to the outside of the room from the third flow path (83) is The control unit (C) further comprises a sensor (17) for detecting the concentration of the flammable refrigerant in the fluid. ) controls the third valve so that the concentration detected by the sensor (17) is equal to or lower than a predetermined concentration. (77) to control the opening.

[0022] In the eighth aspect, the sensor (17) detects the concentration of the first refrigerant in the fluid discharged to the outside. The control unit (C) detects that the concentration of the first refrigerant detected by the sensor (17) is equal to or lower than a predetermined concentration. As a result, the first cooling water in the fluid discharged to the outside of the room is The concentration of the solvent can be kept below a predetermined concentration.

[0023] A ninth aspect is directed to a refrigeration cycle device. The refrigeration cycle device includes a refrigerant containing a flammable refrigerant. a first refrigerant circuit (40) for performing a refrigeration cycle using a first refrigerant containing carbon dioxide; and a second refrigerant circuit (60) that performs a refrigeration cycle using a refrigerant. The refrigerant discharge unit (U) according to any one of claims 1 to 8 is provided.

[0024] A tenth aspect is the ninth aspect, wherein the flammable refrigerant is propane.

[0025] In a tenth aspect, the first refrigerant in the first refrigerant circuit (40) is a flammable refrigerant, particularly a flammable refrigerant for use in an earth-based Propane has a low global warming potential (GWP). As a result, when a flammable refrigerant is released outdoors, This can reduce the impact on global warming.

[0026] In an eleventh aspect, in the ninth or tenth aspect, the first flow path (81) is The second flow path (82) is connected to a high-pressure line of the second refrigerant circuit (60). It is connected to the high-voltage line.

[0027] In the eleventh aspect, the first flow path (81) is connected to a high-pressure line of the first refrigerant circuit (40). As a result, the difference between the pressure in the first refrigerant circuit (40) and the pressure in the tank (70) increases. As a result, the first refrigerant can be easily sent to the tank (70). By connecting the pressure line, the pressure in the second flow path (82) and the pressure in the tank (70) are As a result, the second refrigerant can be more easily sent to the tank (70).

[0028] A twelfth aspect is any one of the ninth to eleventh aspects, wherein the first refrigerant of the first refrigerant circuit (40) is The cooling fan (60) further includes a heat exchanger for exchanging heat between the cooling fan (60) and the second refrigerant in the second refrigerant circuit (60).

[0029] In a twelfth aspect, the refrigeration cycle device performs a binary refrigeration cycle.

[0030] A thirteenth aspect of the present disclosure is a gas turbine engine having a first compressor (42) and using a first refrigerant containing a flammable refrigerant. The compressor includes a first refrigerant circuit (40) for performing a refrigeration cycle using a refrigerant containing carbon dioxide, and a second compressor (62). a second refrigerant circuit (60) for performing a refrigeration cycle using a second refrigerant containing The present invention relates to a refrigerant discharge method applied to the first refrigerant circuit (40 The first refrigerant in the second refrigerant circuit (60) is mixed with the second refrigerant in the second refrigerant circuit (61), and then the mixed refrigerant is discharged outside the room. do.

[0031] In a thirteenth aspect, a first refrigerant in the first refrigerant circuit (40) and a second refrigerant in the second refrigerant circuit (60) are mixed. By mixing the first refrigerant and the second refrigerant, the concentration of the first refrigerant in the mixed fluid is reduced. By discharging the refrigerant to the outside, the concentration of the first refrigerant discharged to the outside can be reduced. [Brief explanation of the drawings]

[0032] [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 flow chart of the discharge operation. [Figure 4] FIG. 4 is a flowchart of the first operation. [Figure 5] FIG. 5 is a flowchart of the second operation. [Figure 6] FIG. 6 is a flowchart of the third operation. [Figure 7] FIG. 7 is a block diagram showing the relationship between the control unit of the air conditioner and the refrigerant release unit and various devices in the modified example. [Figure 8] FIG. 8 is a schematic diagram of a third pipe in a first example of another embodiment. [Figure 9] FIG. 9 is a schematic diagram of a third pipe in a second example of another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0033] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and may be modified without departing from the technical idea of ​​the present disclosure. Various modifications are possible within the scope of the present disclosure. Therefore, for ease of understanding, dimensions, ratios, or numbers may be exaggerated or simplified as necessary. There are cases where this happens.

[0034] (1) Air conditioning equipment As shown in FIG. 1, the air conditioner (10) includes an outdoor unit (20), an indoor unit (30), and , a connecting pipe (22), and a refrigerant discharge unit (U). The air conditioner (10) adjusts the temperature of the air in the indoor space, which is the indoor space. The air conditioner (10) is an example of a refrigeration cycle apparatus (10).

[0035] The air conditioner (10) has two interconnecting pipes between the outdoor unit (20) and the indoor unit (30). The air conditioner (10) is a separate type, connected by a first refrigerant circuit (40) and a second refrigerant circuit (22). The first refrigerant circuit (40) and the second refrigerant circuit (60) perform separate refrigeration cycles. The two refrigerant circuits (60) are connected to each other by a cascade heat exchanger (44). The heat exchanger (44) is shared by the first refrigerant circuit (40) and the second refrigerant circuit (60). The first refrigerant circuit (40) is a primary refrigerant circuit, and the second refrigerant circuit (60) is a secondary refrigerant circuit. be.

[0036] (1-1) 1st refrigerant circuit The first refrigerant circuit (40) is filled with a first refrigerant. The first refrigerant is a single flammable refrigerant. The refrigerant is a single refrigerant or a mixture of refrigerants containing a flammable refrigerant. The flammable refrigerant is, for example, propane. Propane has zero ozone depletion potential, a low global warming potential, and a low environmental impact. The first refrigerant circuit (40) operates in a vapor compression refrigeration cycle. The refrigerant pressure during the refrigeration cycle is relatively low, that is, it is a so-called low-pressure refrigerant.

[0037] The first refrigerant circuit (40) includes a first compressor (42), a cascade heat exchanger (44), a first expansion valve ( The first refrigerant circuit (40) includes a first high-pressure line (43), and a first outdoor heat exchanger (41). The first high pressure line (H1) is connected to the first compressor (42) and the second low pressure line (L1). The first low-pressure line (L1) is a refrigerant flow path extending from the discharge side of the first expansion valve (42) to the first expansion valve (43). The refrigerant flow path extends from the first expansion valve (43) to the suction side of the first compressor (42).

[0038] The first compressor (42) compresses the sucked refrigerant and discharges the compressed refrigerant. 42) refers to the type of rotating device, such as scroll type, swing piston type, rolling piston type, and screw type. The first compressor (42) is a rotary compressor. The operating frequency (number of revolutions) of the first compressor (42) is controlled by an inverter device. The first compressor (42) has a discharge side connected to a first discharge pipe (42a). A first suction pipe (42b) is connected to the suction side of the compressor (42).

[0039] The cascade heat exchanger (44) includes a primary flow path (44a) connected to the first refrigerant circuit (40), and a secondary flow path (44b) connected to the second refrigerant circuit (40). The cascade heat exchanger (44) has a secondary flow path (44b) connected to the second refrigerant circuit (60). The first refrigerant flowing through the primary flow path (44a) and the second refrigerant flowing through the secondary flow path (44b) are heat-exchanged. To exchange.

[0040] The first expansion valve (43) reduces the pressure of the refrigerant. between the primary flow path (44a) of the cascade heat exchanger (44) and the first outdoor heat exchanger (41). is connected to.

[0041] The first outdoor heat exchanger (41) is a fin-and-tube air heat exchanger. The heat exchanger (41) is an example of a heat source side heat exchanger. The first outdoor fan (25) is provided in the outdoor unit (20). (41) is a heat exchanger for exchanging heat between the refrigerant flowing therein and the outdoor air blown by the first outdoor fan (25). To make.

[0042] (1-2)Second refrigerant circuit The second refrigerant circuit (60) is filled with a second refrigerant. The second refrigerant is a simple refrigerant made of carbon dioxide. The second refrigerant circuit is filled with a single refrigerant or a mixed refrigerant containing carbon dioxide. The amount of the first refrigerant charged into the second refrigerant circuit (60) is greater than the amount of the first refrigerant charged into the first refrigerant circuit (60). The second refrigerant is compressed by a vapor compression refrigeration cycle. The second refrigerant circuit (60) has a pressure higher than the high pressure of the refrigerant. The refrigerant compressed by the second compressor (62) operates in a supercritical cycle in which the pressure of the refrigerant reaches or exceeds the critical pressure.

[0043] The second refrigerant circuit (60) includes an outdoor circuit (21) provided in the outdoor unit (20) and an indoor unit (21). The outdoor circuit (21) has an indoor circuit (31) provided in the refrigerant tank (30). A gas-side shutoff valve (48) is connected to the outdoor circuit (21), and a liquid-side shutoff valve (49) is connected to the liquid-side end of the outdoor circuit (21). The gas end of the outdoor circuit (21) is connected to a gas side shutoff valve (48) and a gas connection pipe (22a The liquid end of the outdoor circuit (21) is connected to the gas end of the indoor circuit (31) via a liquid side closure. The liquid side end of the indoor circuit (31) is connected via a stop valve (49) and a liquid connection pipe (22b).

[0044] The outdoor circuit (21) includes a second compressor (62), a cascade heat exchanger (44), a second expansion valve (63), The second expansion valve (63) is provided in the indoor circuit (31), and the second outdoor heat exchanger (64) is provided in the indoor circuit (31). The outdoor circuit (21) has a second high-pressure line (H2) and a second low-pressure line (L2). The second high-pressure line (H2) extends from the discharge side of the second compressor (62) to the second expansion valve (63). The second low-pressure line (L2) is a refrigerant flow path between the second expansion valve (63) and the second compressor (62). The refrigerant flow path extends from the intake side to the intake side.

[0045] The second compressor (62) has the same basic configuration as the first compressor (42), and includes a second expansion valve (63 The basic configuration of the second expansion valve (63) is the same as that of the second expansion valve (64), and therefore, the description thereof will be omitted. A second discharge pipe (62a) is connected to the discharge side of the second compressor (62). A second suction pipe (62b) is connected to the side of the intake pipe (62).

[0046] The second outdoor heat exchanger (64) is a fin-and-tube air heat exchanger. The heat exchanger (64) is an example of a heat source side heat exchanger. The second outdoor fan (26) is provided in the outdoor unit (20). (64) is a heat exchanger for exchanging heat between the refrigerant flowing therein and the outdoor air blown by the second outdoor fan (26). To make.

[0047] The outdoor circuit (21) has a four-way selector valve (50). The first refrigeration cycle is a heating cycle, and the second refrigeration cycle is a heating cycle. The four-way switching valve (50) is in a first state indicated by a solid line in FIG. 1. In the first state, the four-way selector valve (50) switches to the second compression state. The suction side of the compressor (62) is connected to the gas side of the second outdoor heat exchanger (64), and the second compressor (62) is connected to the gas side of the second outdoor heat exchanger (64). The four-way selector valve in the second state communicates the discharge side of the heat exchanger (62) with the gas side of the indoor heat exchanger (61). (50) is provided to connect the suction side of the second compressor (62) to the gas side of the indoor heat exchanger (61). At the same time, the discharge side of the second compressor (62) and the gas side of the second outdoor heat exchanger (64) are brought into communication with each other.

[0048] The indoor circuit (31) includes an indoor heat exchanger (61). The indoor heat exchanger (61) is an example of a utilization-side heat exchanger. An indoor fan (32) provided in the indoor unit (30) is disposed near the indoor heat exchanger (61). The indoor heat exchanger (61) is arranged in a refrigerant-air conditioner (61) and a refrigerant-air conditioner (61) that is blown by the indoor fan (32). The indoor fan (32) exchanges heat with the outdoor air cooled by the indoor heat exchanger (61). Alternatively, heated air is supplied to the indoor space.

[0049] (1-3) Sensor The air conditioner (10) has a plurality of sensors. The plurality of sensors includes a first pressure sensor (11 ), a second pressure sensor (12), a third pressure sensor (13), a fourth pressure sensor (14), an indoor temperature sensor The sensor (16) and the refrigerant sensor (17) are provided.

[0050] The first pressure sensor (11) is connected to the first discharge pipe (42a) of the first refrigerant circuit (40). The first pressure sensor (11) detects the refrigerant pressure in the first high pressure line (H1) of the first refrigerant circuit (40). do.

[0051] The second pressure sensor (12) is connected to the first suction pipe (42b) of the first refrigerant circuit (40). The second pressure sensor (12) detects the refrigerant pressure in the first low-pressure line (L1) of the first refrigerant circuit (40). do.

[0052] The third pressure sensor (13) is connected to the second discharge pipe (62a) of the second refrigerant circuit (60). The third pressure sensor (13) detects the refrigerant pressure in the second high-pressure line (H2) of the second refrigerant circuit (60). do.

[0053] The fourth pressure sensor (14) is connected to the second suction pipe (62b) of the second refrigerant circuit (60). The fourth pressure sensor (14) detects the refrigerant pressure in the second low-pressure line (L2) of the second refrigerant circuit (60). do.

[0054] The indoor temperature sensor (16) detects the temperature of the indoor space. It is provided in the unit (30).

[0055] The refrigerant sensor (17) is connected to a third pipe (73) provided in a refrigerant discharge unit (U) to be described later. The refrigerant sensor (17) detects the concentration of the refrigerant released from the first outdoor fan ( 25) or the outlet (92) of the third pipe (73) of the refrigerant discharge unit (U) described later. The refrigerant sensor (17) is located within 300 mm from the outlet (92). It is preferable to set the position at a position of 100 mm to 300 mm, more preferably at a position of 200 to 300 mm. It is preferable that the sensor is provided at a position.

[0056] (1-4) Remote controller The air conditioner (10) has a remote controller (90). By operating the controller (90), you can select the operation mode such as cooling, heating, or discharge. You can choose.

[0057] (1-5) Control unit As shown in FIG. 2, the air conditioner (10) has an air conditioning control unit (AC). The air conditioning control unit (AC) is an example of the control unit (C). The outdoor control unit (C1) and the indoor control unit (C2) are connected by wire or wireless. are configured to be able to communicate with each other via the

[0058] The outdoor control unit (C1) and the indoor control unit (C2) are MCU (Micro Controller Unit). The MCU includes a CPU (Central Processing Unit), an electric circuit, an electronic circuit, and a memory unit. It includes a central processing unit (Central Processing Unit), memory, and a communication interface. The library stores various programs to be executed by the CPU.

[0059] The outdoor control section (C1) is provided in the outdoor unit (20). Switching between operation and stop of the compressor (42), the rotation speed of the first compressor (42), and the first outdoor fan (25) and the second outdoor fan (26), and switching between operation and stop of the first outdoor fan (25) and the second outdoor fan (26). The rotation speed of the outdoor fan (26), the opening degree of the first expansion valve (43), and the operation and stop of the second compressor (62) the rotation speed of the second compressor (62), the opening of the second expansion valve (63), the liquid side shutoff valve (49), and The gas-side shutoff valve (48) is controlled to be switched between open and closed states.

[0060] The outdoor control unit (C1) includes a first pressure sensor (11), a second pressure sensor (12), and a third pressure sensor (13). (13) and the fourth pressure sensor (14).

[0061] The indoor control section (C2) is provided in the indoor unit (30). The indoor control unit controls the operation and stop of the indoor fan (32) and the rotation speed of the indoor fan (32). (C2) receives a detection signal from the indoor temperature sensor (16).

[0062] (2) Operation of the air conditioner (2-1) Cooling operation In the cooling operation, the control section (C) sets the four-way switching valve (50) to the first state, and the first compressor (42) , a second compressor (62), a first outdoor fan (25), a second outdoor fan (26), and an indoor fan (32) is operated to adjust the openings of the first expansion valve (43) and the second expansion valve (63). In the figure, the flow of refrigerant during cooling operation is indicated by solid arrows.

[0063] In the first refrigerant circuit (40), the first outdoor heat exchanger (41) functions as a radiator, and the cascade heat A refrigeration cycle is performed in which the first refrigerant evaporates in the primary flow path (44a) of the exchanger (44).

[0064] Specifically, the first refrigerant is compressed by the first compressor (42) and then passed through the first outdoor heat exchanger ( The first refrigerant that has dissipated heat in the first outdoor heat exchanger (41) is reduced in temperature in the first expansion valve (43). After being compressed, the refrigerant flows through the primary flow path (44a) of the cascade heat exchanger (44). In the converter (44), the first refrigerant flowing through the primary flow path (44a) is mixed with the second refrigerant flowing through the secondary flow path (44b). The second refrigerant absorbs heat and evaporates, and the evaporated refrigerant is compressed again in the first compressor (42).

[0065] In the second refrigerant circuit (60), the second outdoor heat exchanger (64) functions as a radiator, and the indoor heat exchanger (65) functions as a radiator. In the second refrigerant circuit (60), the refrigerant (61) functions as an evaporator to perform a refrigeration cycle. The heat exchanger (44) functions as a subcooling heat exchanger for cooling the second refrigerant.

[0066] Specifically, the second refrigerant is compressed by the second compressor (62) and then passed through the second outdoor heat exchanger ( The second refrigerant that has dissipated heat in the second outdoor heat exchanger (64) is passed through the cascade heat exchanger ( In the cascade heat exchanger (44), the refrigerant flows through the secondary flow path (44b). The second refrigerant flowing through the primary flow path (44a) is cooled by the first refrigerant flowing through the primary flow path (44b). The second refrigerant is decompressed by the second expansion valve (63) and then evaporated in the indoor heat exchanger (61). As a result, the room air is cooled. The evaporated refrigerant is compressed again in the second compressor (62).

[0067] (2-2) Heating operation In the heating operation, the control section (C) switches the four-way switching valve (50) to the second state, and the second compressor (62) , the second outdoor fan (26), and the indoor fan (32) are operated, and the first compressor (42) and the The outdoor fan (25) is stopped, and the opening of the second expansion valve (63) is adjusted. The flow of refrigerant during operation is indicated by dashed arrows.

[0068] In the first refrigerant circuit (40), no refrigeration cycle is performed.

[0069] In the second refrigerant circuit (60), the indoor heat exchanger (61) functions as a radiator, and the second outdoor heat exchanger (62) functions as a radiator. The refrigeration cycle is performed in which the refrigerant (64) functions as an evaporator.

[0070] Specifically, the second refrigerant is compressed by the second compressor (62) and then passed through the indoor heat exchanger (61). As a result, the indoor air is heated. The refrigerant is reduced in pressure by the second expansion valve (63) and then evaporated in the second outdoor heat exchanger (64). The medium is compressed again in the second compressor (62).

[0071] (3) Issues with refrigerant release into the atmosphere When an air conditioner is no longer in use, the refrigerant must be removed from the refrigerant circuit of the air conditioner in order to comply with environmental regulations. However, natural refrigerants with low global warming potential are The use of air conditioning equipment has been discontinued due to its relatively low impact on ozone layer depletion and global warming. If this is done, the refrigerant may be released into the atmosphere.

[0072] Specifically, when a worker cuts off the refrigerant piping or opens a designated service port, However, the outdoor unit installation location and the refrigerant release work location may cause the refrigerant to be released directly into the atmosphere. Depending on the type of equipment, the concentration of flammable refrigerant may become excessively high. The air conditioner (10) of the present disclosure includes a first refrigerant in a first refrigerant circuit (40) and a second refrigerant circuit (41). (60) A refrigerant discharge unit (U) is provided to mix the second refrigerant and then discharge it into the atmosphere.

[0073] (4) Configuration of the refrigerant release unit The refrigerant discharge unit (U) of this embodiment is installed during the manufacturing and shipping stages of the air conditioner (10). The refrigerant discharge unit (U) is installed in the air conditioner (10). The refrigerant discharge unit (U) is arranged in the tank (70), the first pipe (71), the second pipe (72), and the (72), a third pipe (73), a first valve (75), a second valve (76), and a third valve (77). The tank (70) is a sealed container that defines a space inside.

[0074] The first pipe (71) connects the first refrigerant circuit (40) and the tank (70). The second refrigerant circuit (40) forms a first flow path (81) that connects the first refrigerant circuit (40) and the tank (70). The pipe (72) connects the second refrigerant circuit (60) and the tank (70). The second refrigerant circuit (60) and the tank (70) are connected to each other through a second flow path (82). One end of the third pipe (73) is connected to the tank (70). The other end of the third pipe (73) is connected to the outside space, forming a third flow path (83) that connects the outside space to the The discharge port (92) is formed between the first chamber (20) and the second chamber (21). The third flow path (83) is formed in the tank (70). It may be an opening that communicates the interior space of the roof (70) with the outdoor space.

[0075] The first valve (75) is provided in the first flow path (81). The opening degree of the first valve (75) is adjustable. The first valve (75) is configured as a flow rate control valve. The second valve (76) is provided in the second flow path (82). The opening of the second valve (76) is The second valve (76) is configured as an adjustable flow rate control valve. The second valve (76) controls the flow rate of the second refrigerant flowing through the second flow path (82). The third valve (77) is provided in the third flow path (83). The third valve (77) is configured as a flow rate control valve whose opening degree is adjustable. The flow rate of the mixed fluid is adjusted.

[0076] The first valve (75), the second valve (76), and the third valve (77) may be electromagnetic on-off valves. The opening degrees of the first valve (75), the second valve (76), and the third valve (77) are controlled by the outdoor control section (C1). To be controlled.

[0077] (5) Discharge operation The discharge operation of the air conditioner (10) for discharging refrigerant will be described. The operation is performed by mixing a first refrigerant containing a flammable refrigerant and a second refrigerant containing carbon dioxide refrigerant in a room. This is the operation to release the heat into the outside space. The outline of the release operation will be explained with reference to Figure 3.

[0078] As shown in FIG. 3, in step ST11, the outdoor control unit (C1) By operating the controller (90), a signal to perform a discharge operation is received. (YES in step ST11). In step ST12, the outdoor control section (C1) In the first operation, the first refrigerant in the first refrigerant circuit (40) is transferred to the tank (70). The operation is to send it to

[0079] When the first operation is completed, in step ST13, the outdoor control section (C1) In the second operation, the second refrigerant in the second refrigerant circuit (60) is supplied to the tank (U). This is a drive to send it to (70).

[0080] When the second operation is completed, in step ST14, the outdoor control section (C1) In the third operation, the first refrigerant and the second refrigerant in the tank (70) are mixed. This is an operation to send the mixed fluid to the outdoor space.

[0081] When the third operation is completed, in step ST15, the outdoor control section (C1) performs the same process as in step ST12. It is determined whether the first operation has stopped due to a high pressure abnormality. Details of this determination will be described later. If it is determined in step ST15 that the operation has stopped due to a high pressure abnormality (YES in step ST15), The process returns to step ST12, and the first operation, the second operation, and the third operation are executed again. In step ST15, if it is not determined that the operation has stopped due to a high pressure abnormality (NO in step ST15), the discharge operation The rotation ends.

[0082] (5-1) First operation The first operation will be described in detail. As shown in FIG. 4, in step ST21, the outdoor control unit (C1) is a circuit diagram showing a first outdoor fan (25) that is operated at a predetermined rotation speed (low rotation speed) that is lower than the maximum rotation speed. In this way, by reducing the rotation speed of the first outdoor fan (25) to less than the maximum rotation speed, In the first operation, the increase in the high pressure in the first refrigerant circuit (40) can be promoted. In step ST22, the outdoor control section (C1) closes the first expansion valve (43). The control section (C1) operates the first compressor (42). The first refrigerant in the first low-pressure line (L1) is The refrigerant is compressed by the first compressor (42) and discharged into the first discharge pipe (42a). Since the expansion valve (43) is closed, the first refrigerant in the first high-pressure line (H1) flows into the first low-pressure line ( By closing the first expansion valve (43), the first refrigerant in the first high-pressure line (H1) is not sent to the second expansion valve (43). The pressure rises rapidly.

[0083] In step ST24, the outdoor control section (C1) opens the first valve (75). 75) is opened, a first operation is performed to send the first refrigerant in the first refrigerant circuit (40) to the tank (70). At this time, the second valve (76) and the third valve (77) are closed. Step ST21 The order of steps ST24 to ST24 is an example, and a different order may be used. Step ST23 may be performed. After the first expansion valve (43) is closed, the first compressor (42) is operated. By doing so, the pressure in the first high-pressure line (H1) can be increased quickly.

[0084] In step ST25, the outdoor control section (C1) calculates the pressure detected by the first pressure sensor (11), that is, The first pressure sensor determines whether the high pressure in the first refrigerant circuit (40) is equal to or greater than a predetermined value. If the detected pressure in (11) is equal to or greater than the predetermined value (YES in step ST25), the process proceeds to step ST27. If not (NO in step ST25), the process proceeds to step ST26.

[0085] In step ST26, the outdoor control section (C1) calculates the pressure detected by the second pressure sensor (12), that is, The second pressure sensor determines whether the low pressure in the first refrigerant circuit (40) is equal to or lower than a predetermined value. If the detected pressure in (12) is equal to or less than the predetermined value (YES in step ST26), the process returns to step ST26. If not (NO in step ST26), the process proceeds to step ST27.

[0086] In step ST27, the outdoor control section (C1) stops the first compressor (42). At 28, the outdoor control section (C1) closes the first valve (75), thereby completing the first action. When the first action is completed, the first refrigerant remains in the tank (70). In operation, step ST27 may be performed after step ST28.

[0087] (5-2) Second operation The second operation will be described in detail. As shown in FIG. 5, in step ST31, the outdoor control unit In step ST32, the outdoor control section (C1) closes the second expansion valve (63). Specifically, in step ST32, the outdoor control section (C1) operates the compressor (62). In this operation, the second compressor (62) is operated so that the high pressure of the second refrigerant circuit (60) is equal to or higher than the critical pressure. The second refrigerant in the second low-pressure line (L2) is compressed by the second compressor (62). At this time, the second expansion valve (63) is closed, and the refrigerant is discharged into the second discharge pipe (62a). The second refrigerant in the second high pressure line (H2) is not sent to the second low pressure line (L2). ) is closed, the pressure of the second refrigerant in the second high pressure line (H2) rises quickly.

[0088] In step ST33, the outdoor control section (C1) opens the second valve (76). 76) is opened, a second operation is performed to send the second refrigerant in the second refrigerant circuit (60) to the tank (70). At this time, the first valve (75) and the third valve (77) are closed. Step ST31 The order of steps ST33 to ST33 is an example, and a different order may be used. Step ST32 may be performed. After the second expansion valve (63) is closed, the second compressor (62) is operated. By doing so, the pressure in the second high-pressure line (H2) can be increased quickly.

[0089] In step ST34, the outdoor control section (C1) calculates the pressure detected by the third pressure sensor (13), that is, The third pressure sensor determines whether the high pressure in the second refrigerant circuit (60) is equal to or greater than a predetermined value. If the detected pressure in (13) is equal to or greater than the predetermined value (YES in step ST34), the process proceeds to step ST36. If not (NO in step ST34), the process proceeds to step ST35.

[0090] In step ST35, the outdoor control section (C1) calculates the pressure detected by the fourth pressure sensor (14), that is, The fourth pressure sensor determines whether the low pressure in the second refrigerant circuit (60) is equal to or lower than a predetermined value. If the detected pressure in (14) is equal to or less than the predetermined value (YES in step ST35), the process proceeds to step ST36. If not (NO in step ST35), the process proceeds to step ST34.

[0091] In step ST36, the outdoor control section (C1) stops the second compressor (62).

[0092] In step ST37, the outdoor control section (C1) closes the second valve (76). When the second operation is completed, the first refrigerant and the second refrigerant are mixed in the tank (70). In the second operation, step ST36 is performed after step ST37. It is also possible.

[0093] In step ST38, the outdoor control section (C1) controls the third compressor (62) when the second compressor (62) is stopped. The high pressure (pressure value (A)) of the second refrigerant circuit (60) detected by the force sensor (13) is stored in a memory. The high pressure in the second refrigerant circuit (60) is substantially the same as the internal pressure of the tank (70). It is power.

[0094] (5-3) Third operation The details of the third operation will be described. As shown in FIG. 6, in step ST41, the outdoor control unit In (C1), the first outdoor fan (25) is operated at the maximum rotation speed. This improves the agitation effect of the fluid released into the outdoor space.

[0095] In step ST42, the outdoor control section (C1) determines the initial opening degree of the third valve (77).

[0096] The outdoor control unit (C1) reads the pressure value (A) stored in the storage unit in step ST38. For example, the outdoor control section (C1) adjusts the initial opening degree of the third valve (77) as the pressure value (A) increases. The smaller the pressure value (A), the larger the initial opening of the third valve (77). In this way, in the third operation, the outdoor control section (C1) controls the flow rate of the fluid discharged into the outdoor space to be excessive. The initial opening degree of the third valve (77) is determined so that the temperature does not become too high.

[0097] In step ST43, the outdoor control section (C1) opens the third valve 100 at the initial opening degree determined in step ST42. As a result, the first refrigerant and the second refrigerant are mixed with the third valve (77) open. A third operation is performed to discharge the fluid from the tank (70) into the outdoor space. The fluid in the tank (70) is discharged to the outdoor space through the third pipe (73). In addition, the discharge port (92) of the third pipe (73) is located near the first outdoor fan (25). Therefore, the discharged fluid and the outdoor air can be agitated by the first outdoor fan (25).

[0098] In step ST44, the outdoor control section (C1) opens the second valve (76). As a result, the second high-pressure The line (H2) communicates with the inside of the tank (70), and the pressure of the second high-pressure line (H2) and the pressure of the tank (70) The pressure inside the second valve (76) is substantially the same as the pressure inside the second valve (70). After opening, the third valve (77) may be opened in step ST44.

[0099] In step ST45, the outdoor control section (C1) determines whether the concentration detected by the refrigerant sensor (17) is The opening of the third valve (77) is controlled so that the concentration is equal to or less than a predetermined concentration. The predetermined concentration is, for example, the LF concentration of the refrigerant. This is a predetermined value lower than the L (Lower Flammable Limit). If the LFL of the first refrigerant is, for example, 5%, For example, the predetermined concentration is set to 3%.

[0100] In step ST45, the refrigerant sensor (17) detects the first refrigerant released into the outdoor space by the third action. The outdoor control section (C1) detects the refrigerant concentration. If the concentration is higher than the certain concentration, the third valve (77) is controlled so that the opening of the third valve (77) is reduced. This reduces the flow rate of the fluid discharged from the third pipe (73) to the outdoor space. The concentration of the first refrigerant released into the outside space can be reduced.

[0101] When the refrigerant concentration detected by the refrigerant sensor (17) is lower than a predetermined concentration, the outdoor control unit (C1) The third valve (77) is controlled so that the opening of the third valve (77) increases within a range that does not exceed a predetermined concentration. You may do so.

[0102] In step ST46, the outdoor control section (C1) determines whether the pressure inside the tank (70) has reached atmospheric pressure. When the mixed fluid is released into the outdoor space by the third operation, the tank ( As a result, the pressure inside the second high-pressure line (H2 The outdoor control section (C1) detects that the pressure detected by the third pressure sensor (13) is equal to the atmospheric pressure. If the pressure has reached the predetermined value (YES in step ST46), the process proceeds to step ST47. If so (NO in step ST46), the process returns to step ST46. The outdoor control section (C1) controls the temperature sensor (72) so that the internal pressure of the tank (70) reaches a predetermined pressure slightly higher than atmospheric pressure. It may also be determined whether or not the

[0103] In step ST47, the outdoor control section (C1) closes the second valve (76). The outdoor control section (C1) closes the third valve (77), thereby completing the third action. After the third valve (77) is closed in ST47, the second valve (76) may be closed in step ST48.

[0104] (5-4) Judgment of step ST15 When the third operation is completed, in step ST15 of FIG. 3, the outdoor control unit (C1) During operation, it is determined whether the first compressor (42) has stopped due to abnormal high pressure. The "compressor (42) stops due to abnormal high pressure" means that the first refrigerant circuit ( 40) is satisfied (Yes in step ST25), and the subsequent steps This means that the first compressor (42) has stopped in step ST27. When the operation is stopped due to an abnormality, the first refrigerant remains in the first refrigerant circuit (40) even after the first operation. Therefore, when the condition of step ST15 is met, the outdoor control section (C1) In step ST12, the first operation is executed again. If the condition in step ST15 is not satisfied, In this case, the outdoor control section (C1) ends the discharge operation. If step ST15 is not established (Yes in step ST26), in the third operation, step ST47 or In this case, step ST48 may not be performed.

[0105] (6) Effects of the embodiment (6-1) The refrigerant discharge unit (U) is an air conditioner including a first refrigerant circuit (40) and a second refrigerant circuit (60). The present invention is applied to an air conditioner (10). The first refrigerant circuit (40) has a first compressor (42) and A refrigeration cycle is performed using a first refrigerant containing a hydrophilic refrigerant, and a second refrigerant circuit (60) includes a second compressor. (62) and performs a refrigeration cycle using a second refrigerant containing carbon dioxide.

[0106] The refrigerant discharge unit (U) includes a tank (70), a first refrigerant circuit (40), and a tank (70). a first flow path (81) connected to the first flow path (81), a first valve (75) provided in the first flow path (81), and a second refrigerant circuit a second flow path (82) connecting the tank (70) with the second flow path (60); The tank (70) includes a valve (76) and a third flow path (83) that connects the space inside the tank (70) with the outdoor space. do.

[0107] The refrigerant discharge unit (U) mixes the first refrigerant and the second refrigerant in the tank (70) and then Since the fluid is discharged outdoors, the concentration of the first refrigerant in the discharged fluid can be reduced.

[0108] In addition, in the conventional configuration, the worker who releases the refrigerant must separate the first refrigerant and the second refrigerant. In contrast, workers must release not only the first refrigerant but also the second refrigerant at the same time. This makes it easier for workers to release each refrigerant.

[0109] (6-2) The refrigerant discharge unit (U) further includes a third valve (77) provided in the third flow path (83). Therefore, by closing the third valve (77) provided in the third flow path (83), the The mixed fluid can be stored in the tank (70). In addition, by opening the third valve (77), This allows the mixed fluid to be discharged outside the room.

[0110] (6-3) The refrigerant discharge unit (U) has a first valve (75), a second valve (76), and a third valve (77). Therefore, the first refrigerant and the second refrigerant can be automatically mixed. In addition, the mixed fluid can be automatically discharged outside the room.

[0111] (6-4) The control section (C) controls the first refrigerant in the first refrigerant circuit (40) to flow from the tank (14) while the first valve (75) is open. (70) and the second valve (76) is opened to send the second refrigerant in the second refrigerant circuit (60). The second operation is to send the first refrigerant and the second refrigerant to the tank (70), and the third valve (77) is opened to mix the first refrigerant and the second refrigerant. A third operation is performed in which the combined fluid is discharged from the tank (70) to the outside of the room.

[0112] In a first operation, the refrigerant discharge unit (U) discharges the refrigerant from the first refrigerant circuit (40) to the tank (70). In the second operation, the refrigerant discharge unit (U) can send the refrigerant to the second refrigerant circuit (60). In a third operation, the refrigerant discharging unit (U) can send the refrigerant to the tank (70). The mixed fluid can be discharged outside in the tank (70).

[0113] (6-5) In the first operation, the first valve (75) is opened and the second valve (76) is closed, and the first refrigerant circuit (40) The first operation is to send the first refrigerant to the tank (70), and the second operation is to open the second valve (76) and This is an operation of sending the second refrigerant in the second refrigerant circuit (60) to the tank (70) with the valve (75) closed. The control unit (C) executes the second operation after the first operation.

[0114] The refrigerant discharge unit (U) first sends the first refrigerant, which has a lower pressure than the second refrigerant, to the tank (70). This makes it easier to introduce both types of refrigerant into the tank (70).

[0115] (6-6) The control section (C) performs the first operation while operating the first compressor (42). The second operation is performed while the second compressor (62) is operating.

[0116] The control unit (C) operates the first compressor (42) and the second compressor (62) to circulate the refrigerant The pressure in the circuit can be increased. Therefore, the first refrigerant and the second refrigerant are It becomes easier to enter.

[0117] (6-7) In the second operation, the control section (C) determines whether the high pressure of the second refrigerant circuit (60) exceeds the critical pressure. The second refrigerant circuit (60) is controlled so that the pressure in the second refrigerant circuit (60) is increased. As a result, the second refrigerant in the second refrigerant circuit (60) can be further sent to the tank (70). It's easy to do.

[0118] (6-8) A refrigerant sensor that detects the concentration of flammable refrigerant in the fluid discharged to the outside from the third flow path (83). The control unit (C) detects the concentration of the refrigerant detected by the refrigerant sensor (17) at a predetermined The opening of the third valve (77) is controlled so that the concentration is equal to or lower than this.

[0119] The control unit (C) detects that the concentration of the first refrigerant detected by the refrigerant sensor (17) is equal to or lower than a predetermined concentration. By controlling the opening of the third valve (77) so that the concentration of the first refrigerant in the fluid discharged to the outside of the room is The intensity can be suppressed to a predetermined concentration or less.

[0120] (6-9) The first flow path (81) is connected to a first high-pressure line (H1) of the first refrigerant circuit (40), and the second flow path (82) is connected to the second high pressure line (H2) of the second refrigerant circuit (60).

[0121] The first flow path (81) is connected to a first high-pressure line (H1) of the first refrigerant circuit (40). This increases the difference between the pressure in the first refrigerant circuit (40) and the pressure in the tank (70). As a result, the first refrigerant can be easily sent to the tank (70). By connecting to the second high pressure line (H2) of the circuit (60), the pressure in the second flow path (82) and As a result, the difference in pressure between the tank (70) and the second refrigerant increases. It's easy to do.

[0122] (7) Variations A modification of the refrigerant discharge unit (U) of the above embodiment will be described. The following describes the configuration that is fundamentally different from the above embodiment.

[0123] (7-1) Variation 1 The refrigerant discharge unit (U) of the first modification is installed after the air conditioner (10) installed on-site. The air conditioner (10) installed on-site is the same as the first cooling system of the embodiment. The refrigerant circuit (40) and the second refrigerant circuit (60) are provided.

[0124] The refrigerant discharge unit (U) includes a first pipe (71), a second pipe (72), a third pipe (73), and a The system includes a pipe (73), a first valve (75), a second valve (76), and a third valve (77). The first pipe (72) is connected to the first refrigerant circuit (40), and the second pipe (72) is connected to the second refrigerant circuit (60). The first pipe (71) and the second pipe (72) are connected to a service port of, for example, a shut-off valve. can be.

[0125] As shown in Fig. 7, the refrigerant discharge unit (U) has a discharge side control section (RC). The control unit (C) of 1 is composed of an air conditioning control unit (AC) and a discharge side control unit (RC). The AC and the RC are configured to be able to communicate with each other via wire or wirelessly. In the discharge operation, the discharge-side control section (RC) controls the first valve (75) in the same manner as in the embodiment. , the opening degrees of the second valve (76), and the third valve (77). The AC controls the devices of the outdoor unit (20) in conjunction with the control of the discharge side control section (RC). do.

[0126] (7-2) Variation 2 The refrigerant discharge unit (U) of the second modification is installed after the air conditioner (10) installed on-site. The air conditioner (10) installed on-site is the same as the first cooling system of the embodiment. The refrigerant circuit (40) and the second refrigerant circuit (60) are provided.

[0127] The control unit (C) of the modified example 2 is different from the modified example 1 in that it is composed only of the discharge side control unit (RC), The control unit (C) does not include the air conditioning control unit (AC). Only the valve (76) and the third valve (77) are controlled, and the devices of the outdoor unit (20) are not controlled. The discharge operation is performed, for example, at the end of the operation of the air conditioner (10). At the end of the operation of the refrigerant circuit (10), the pressure in the first refrigerant circuit (40) and the second refrigerant circuit (60) becomes high. Therefore, the first operation and the second operation can be performed without operating the first compressor (42) and the second compressor (62). The third operation can be performed.

[0128] (7-3) Variation 3 The air conditioner (10) of the third modification is configured by adding a second refrigerant circuit ( In the third modification, a four-way switching valve is provided in the second refrigerant circuit (60) in the same manner as in the first modification. The outdoor heat exchanger (64) and the second outdoor fan (26) are omitted. The first refrigerant circuit (40) and the second refrigerant circuit (60) each include a first refrigerant circuit which is a cooling cycle. A refrigeration cycle is performed, and during heating operation, both the first refrigerant circuit (40) and the second refrigerant circuit (60) are refrigerated. Meanwhile, the second refrigeration cycle, which is a heating cycle, is carried out.

[0129] (8) Other embodiments As shown in FIG. 8, the third pipe (73) is provided with a sealing portion (93) that seals the discharge port (92). The sealing part (93) is detachable from the discharge port (92). During normal operation of the air conditioner (10), the refrigerant leaks from the tank (70) to the outside. Suppress.

[0130] As shown in FIG. 9, a third valve (77) may be provided at the outlet (92).

[0131] The first refrigerant circuit (40) and the second refrigerant circuit (60) are connected by a cascade heat exchanger (44). The air conditioners (10) are not necessarily connected to each other. Alternatively, the refrigerant cooling system may have an independent first refrigerant circuit (40) and second refrigerant circuit (60).

[0132] The outlet (92) of the third pipe (73) may be provided near the second outdoor fan (26). stomach.

[0133] The air conditioning control unit (AC) is a remote controller side control unit in the remote controller (90). It may also include a part.

[0134] The flammable refrigerant contained in the first refrigerant may be ammonia (R717). The refrigerant is a highly flammable natural refrigerant such as methane (R50), ethane (R170), or butane (R60). 0), isobutane (R600a) may also be used.

[0135] The first pipe (71) of the embodiment is a pipe connecting the first compressor (42) and the first However, the first pipe (71) is connected to the outdoor heat exchanger (41). The heat exchanger (H1) may be connected between the first outdoor heat exchanger (41) and the first expansion valve (43). The first pipe (71) is connected to the first expansion valve (43) in the first low-pressure line (L1) through a cascade heat exchanger. and between the cascade heat exchanger (44) in the first low pressure line (L1) and the first pressure It may be connected between the compressor (42).

[0136] The second pipe (72) of the embodiment is a pipe connecting the second compressor (62) and the second high-pressure line (H2). However, the second pipe (72) is connected to the outdoor heat exchanger (64). Between the second outdoor heat exchanger (64) and the cascade heat exchanger (44) in the cooling fan (H2), Between the cascade heat exchanger (44) and the second expansion valve (63) in the pressure line (H2), The second pipe (72) may be connected between the shut-off valve (48) and the second compressor (62). The pressure line (L2) may be connected between the second expansion valve (63) and the liquid-side shutoff valve (49). .

[0137] In the first action, the control section (C) may stop the first compressor (42).

[0138] The control section (C) controls the high pressure of the second refrigerant circuit (60) to be lower than the critical pressure. The second refrigerant circuit (60) may be controlled.

[0139] The control unit (C) controls, for example, the second expansion valve (63) and the second outdoor fan (26) to The high pressure of the second refrigerant circuit (60) may be equal to or higher than the critical pressure.

[0140] In the second action, the control section (C) may stop the second compressor (62).

[0141] The second expansion valve (63) may be provided in the indoor unit (30). 63) is provided on the liquid connection pipe (22b) side of the indoor circuit (31).

[0142] Although the embodiments and modifications have been described above, it is understood that the scope of the claims may be exceeded. It will be understood that various changes in form and details are possible without departing from the spirit and scope of the present invention. The embodiments, modifications, and other embodiments of the present disclosure may be used as appropriate as long as they do not impair the functionality of the subject matter of the present disclosure. Combinations and substitutions may be made.

[0143] The above-mentioned terms "first," "second," "third," etc. It is used to distinguish between words and phrases, and does not limit the number or order of those words. stomach. [Industrial Applicability]

[0144] As described above, the present disclosure relates to a refrigerant discharge unit, a refrigeration cycle device, and a refrigerant It is useful for release methods. [Explanation of symbols]

[0145] 10 Air conditioning equipment (refrigeration cycle equipment) 17 Refrigerant sensor (sensor) 40 1st refrigerant circuit 42 No. 1 Compressor 60 Second refrigerant circuit 62 Second compressor 70 Tank 75 First Valve 76 Second Valve 77 Third valve 81 First Channel 82 Second Channel 83 Third Channel C control section U Refrigerant Discharge Unit

Claims

1. A first compressor (42) is provided, and a refrigeration cycle is performed using a first refrigerant containing a flammable refrigerant. The refrigeration system includes a refrigerant circuit (40) and a second compressor (62), and uses a second refrigerant containing carbon dioxide. A refrigerant discharge device (10) having a second refrigerant circuit (60) for performing a refrigeration cycle. An output unit, Tank (70) and a first flow path (81) connecting the first refrigerant circuit (40) and the tank (70); a first valve (75) provided in the first flow path (81); a second flow path (82) connecting the second refrigerant circuit (60) and the tank (70); a second valve (76) provided in the second flow path (82); a third flow path (83) that connects the space inside the tank (70) with an outdoor space; Refrigerant release unit.

2. The system further includes a third valve (77) provided in the third flow path (83).

10. The refrigerant discharge unit of claim 1.

3. The first valve (75), the second valve (76), and the third valve (77) are controlled by a control section (C). controlled by 3. The refrigerant discharge unit of claim 2.

4. The control unit (C) With the first valve (75) open, the first refrigerant in the first refrigerant circuit (40) is supplied to the tank. a first operation of sending the data to the network (70); With the second valve (76) open, the second refrigerant in the second refrigerant circuit (60) is supplied to the tank. a second operation of sending the With the third valve (77) open, a mixture of the first refrigerant and the second refrigerant is introduced into the and a third operation of discharging the water from the tank (70) to the outside of the room.

4. The refrigerant discharge unit of claim 3.

5. The first operation is performed by opening the first valve (75) and closing the second valve (76). an operation of sending the first refrigerant in the first refrigerant circuit (40) to the tank (70), The second operation is performed by opening the second valve (76) and closing the first valve (75). an operation of sending the second refrigerant of the second refrigerant circuit (60) to the tank (70), The control unit (C) executes the second operation after the first operation.

5. The refrigerant discharge unit of claim 4.

6. The control unit (C) The first operation is performed while the first compressor (42) is operating; or The second operation is performed while the second compressor (62) is operating.

6. A refrigerant discharge unit according to claim 4 or 5.

7. In the second operation, the control section (C) The second refrigerant circuit (60) is controlled so that the pressure is equal to or greater than the boundary pressure.

7. The refrigerant discharge unit of claim 6.

8. a sensor for detecting the concentration of the flammable refrigerant in the fluid discharged to the outside of the room through the third flow path (83); It also has a sensor (17), The control section (C) is configured to The opening degree of the third valve (77) is controlled so as to 6. A refrigerant discharge unit according to any one of claims 3 to 5.

9. a first refrigerant circuit (40) that performs a refrigeration cycle using a first refrigerant containing a flammable refrigerant; a second refrigerant circuit (60) for performing a refrigeration cycle using a second refrigerant containing carbon; A cruising device, Equipped with a refrigerant discharge unit (U) according to any one of claims 1 to 5 Refrigeration cycle equipment.

10. The flammable refrigerant is propane The refrigeration cycle device according to claim 9.

11. the first flow path (81) is connected to a high-pressure line of the first refrigerant circuit (40); The second flow path (82) is connected to a high-pressure line of the second refrigerant circuit (60). The refrigeration cycle device according to claim 9.

12. the first refrigerant in the first refrigerant circuit (40) and the second refrigerant in the second refrigerant circuit (60); The device further includes a heat exchanger for exchanging heat between the The refrigeration cycle device according to claim 9.

13. A first compressor (42) is provided, and a refrigeration cycle is performed using a first refrigerant containing a flammable refrigerant. The refrigeration system includes a refrigerant circuit (40) and a second compressor (62), and uses a second refrigerant containing carbon dioxide. A refrigerant discharge device (10) having a second refrigerant circuit (60) for performing a refrigeration cycle. A method for extracting a liquid, comprising: The first refrigerant in the first refrigerant circuit (40) and the second refrigerant in the second refrigerant circuit (60) are mixed. After that, release it outside Refrigerant release method.

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