Compressor unit and refrigeration device

Abstract

A compressor unit (20) comprises a first case (20a), a compressor (21), a connection port (60), and a shutoff valve (67). The connection port (60) includes a first connection port (23) and a second connection port (28). The shutoff valve (67) includes first shutoff valves (23a, 23b) and second shutoff valves (28a, 28b). A heat source heat exchanger (11) is housed in a second case (10a). A utilization heat exchanger (52) is housed in a third case (50a). The compressor unit (20) is disposed inside a building (B). The first connection port (23) is connected to the heat source heat exchanger (11) through a first connecting pipe (30). The second connection port (28) is connected to the utilization heat exchanger (52) through a second connecting pipe (40). The first shutoff valves (23a, 23b) block the movement of a refrigerant (R0) between the first connection port (23) and the heat source heat exchanger (11). The second shutoff valves (28a, 28b) block the movement of the refrigerant (R0) between the second connection port (28) and the utilization heat exchanger (52).

Description

[Technical field]

[0001] A compressor unit and a refrigeration device using the compressor unit. [Background technology]

[0002] Patent Document 1 (JP 2018-511771 A) discloses an air conditioner including a compressor unit, a heat source heat exchanger unit, and a utilization unit. Summary of the Invention [Problem to be solved by the invention]

[0003] The compressor unit has a compressor. The compressor is a source of vibration. If the vibration or the like causes damage to the pipes, the refrigerant will leak from the refrigerant circuit. Therefore, it is necessary to suppress the leakage of the refrigerant in the compressor unit. [Means for solving the problem]

[0004] A compressor unit according to a first aspect includes a first case, a compressor, a connection port, and a shutoff valve. The compressor is accommodated in the first case. The connection port includes a first connection port and a second connection port. The shutoff valve includes a first shutoff valve and a second shutoff valve. The compressor forms a refrigerant cycle together with a heat source heat exchanger and a utilization heat exchanger. The refrigerant cycle uses the heat source heat exchanger as a heat source and circulates a refrigerant. The heat source heat exchanger is accommodated in a second case separated from the first case. The utilization heat exchanger is accommodated in a third case separated from the first case. The compressor unit is disposed inside a building. The first connection port is connected to the heat source heat exchanger via a first connection pipe. The second connection port is connected to the utilization heat exchanger via a second connection pipe. The first shutoff valve blocks the movement of the refrigerant between the first connection port and the heat source heat exchanger. The second shutoff valve shuts off the movement of refrigerant between the second connection port and the utilization heat exchanger.

[0005] According to this configuration, the communication pipe extending from the compressor unit can be shut off by the shutoff valve, so that if a refrigerant leak occurs inside the compressor unit, the leaking refrigerant can be prevented from reaching the outside of the compressor unit.

[0006] A compressor unit according to a second aspect includes a first case, a compressor, a fluid refrigerant heat exchanger, a connection port, and a shutoff valve. The compressor is housed in the first case. The fluid refrigerant heat exchanger is housed in the first case and exchanges heat between a fluid and a refrigerant. The compressor forms a refrigerant cycle together with the fluid refrigerant heat exchanger and a utilization heat exchanger. The refrigerant cycle uses the fluid refrigerant heat exchanger as a heat source and circulates the refrigerant. The utilization heat exchanger is housed in a second case separated from the first case. The compressor unit is disposed inside a building. The connection port is connected to the utilization heat exchanger via a communication pipe. The shutoff valve shuts off the movement of the refrigerant between the connection port and the utilization heat exchanger.

[0007] According to this configuration, the communication pipe extending from the compressor unit can be shut off by the shutoff valve, so that if a refrigerant leak occurs inside the compressor unit, the leaking refrigerant can be prevented from reaching the outside of the compressor unit.

[0008] A compressor unit according to a third aspect is the compressor unit according to the first or second aspect, further comprising a leakage detection sensor. The leakage detection sensor is housed in the first case and detects leakage of the refrigerant.

[0009] According to this configuration, the leakage detection sensor detects the leakage of the refrigerant, and therefore the shutoff valve can be shut off based on the output signal of the leakage detection sensor.

[0010] A compressor unit according to a fourth aspect is the compressor unit according to the third aspect, further comprising a control unit. The control unit closes the shutoff valve when the leakage detection sensor detects leakage of the refrigerant.

[0011] According to this configuration, when a refrigerant leak is detected, the control unit automatically closes the shutoff valve, thereby quickly preventing the refrigerant leak.

[0012] A compressor unit according to a fifth aspect is the compressor unit according to the fourth aspect, wherein the control unit is disposed outside the first case.

[0013] According to this configuration, the control unit is disposed outside the first case, so that heat generated by the circuit board that constitutes the control unit can be effectively dissipated.

[0014] A compressor unit according to a sixth aspect is the compressor unit according to the fourth aspect, further comprising a cooling refrigerant pipe. The cooling refrigerant pipe is housed in the first case. The control unit is disposed inside the first case and is cooled by the cooling refrigerant pipe.

[0015] According to this configuration, the control unit is cooled by the cooling refrigerant piping, and therefore heat generated by the circuit board constituting the control unit can be effectively dissipated by using the cooling refrigerant piping.

[0016] A compressor unit of a seventh aspect is the compressor unit of the fourth aspect, further comprising an electrical component, a heat sink, and a fan. The electrical component is housed in a first case. The heat sink is housed in the first case and cools the electrical component. The fan is housed in the first case and forms a circulating airflow. The control unit is disposed inside the first case and is cooled by the circulating airflow.

[0017] According to this configuration, the control unit is cooled by the circulating air current generated by the fan, and therefore the heat generated by the electrical components can be effectively dissipated by the circulating air current.

[0018] A compressor unit according to an eighth aspect is the compressor unit according to any one of the third aspect to the seventh aspect, in which the leakage detection sensor is a refrigerant detection sensor. The refrigerant detection sensor detects the presence of a refrigerant.

[0019] According to this configuration, the leakage detection sensor is a refrigerant detection sensor, and therefore it is possible to directly detect leaking refrigerant.

[0020] A compressor unit according to a ninth aspect is the compressor unit according to any one of the third aspect to the seventh aspect, wherein the first case is airtight.

[0021] According to this configuration, the first case is airtight, and therefore, refrigerant that has leaked into the compressor unit can be prevented from reaching the outside of the compressor unit.

[0022] A compressor unit according to a tenth aspect is the compressor unit according to the ninth aspect, in which the leakage detection sensor is a pressure sensor. The pressure sensor detects the pressure inside the first case.

[0023] According to this configuration, the leak detection sensor is a pressure sensor, and therefore, the leak of the refrigerant can be detected by using a change in pressure.

[0024] A compressor unit according to an eleventh aspect is the compressor unit according to the ninth or tenth aspect, wherein the first case has a rupture disc. The rupture disc is ruptured by a pressure exceeding a predetermined value.

[0025] According to this configuration, the first case has a rupture disc, which makes it possible to prevent the highly airtight first case from bursting due to high internal pressure.

[0026] A compressor unit according to a twelfth aspect is the compressor unit according to any one of the first aspect to the eleventh aspect, in which the refrigerant is R32 or carbon dioxide.

[0027] According to this configuration, the refrigerant is a natural refrigerant.

[0028] A refrigeration device according to a thirteenth aspect includes the compressor unit according to the first aspect, a heat source heat exchanger unit, and a utilization unit. The heat source heat exchanger unit has a second case and a heat source heat exchanger. The utilization unit has a third case and a utilization heat exchanger. The heat source heat exchanger unit is disposed inside a building and is fluidly connected to the outside of the building.

[0029] According to this configuration, the heat source heat exchanger unit is disposed inside the building, and therefore does not spoil the aesthetic appearance of the building. [Brief description of the drawings]

[0030] [Figure 1] 1 is a circuit diagram of a refrigeration device 100 according to a first embodiment. [Diagram 2] FIG. 2 is an external view of a compressor unit 20. [Diagram 3] FIG. 2 is an external view of indoor units 501 and 502. [Figure 4] FIG. 1 is a circuit diagram of a refrigeration device 100 according to Modification 1A of the first embodiment. [Diagram 5] FIG. 11 is a schematic diagram of a refrigeration device 100 according to Modification 1B of the first embodiment. [Figure 6] FIG. 4 is a circuit diagram of a refrigeration device 100 according to a second embodiment. [Figure 7] FIG. 11 is a circuit diagram of a refrigeration device 100 according to a modified example 2A of the second embodiment. [Figure 8] FIG. 11 is a circuit diagram of a refrigeration device 100 according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] First Embodiment (1) Overall structure FIG. 1 is a circuit diagram of a refrigeration device 100 according to the first embodiment. The refrigeration device 100 is typically an air conditioner, but is not limited thereto. The refrigeration device 100 may be a refrigerator, a freezer, a water heater, or the like. The refrigeration device 100 includes a heat source heat exchanger unit 10, a compressor unit 20, a first connecting pipe 30, utilization units 501 and 502, and a second connecting pipe 40. The refrigeration device 100 uses a refrigerant R0. The refrigerant R0 may be, for example, R32 or carbon dioxide.

[0032] (2) Detailed configuration (2-1) Heat source heat exchanger unit 10 The heat source heat exchanger unit 10 is disposed outside the building B. The heat source heat exchanger unit 10 includes a case 10a, a heat source heat exchanger 11, a heat source fan 12, a heat source heat exchanger unit expansion valve 13, and a heat source heat exchanger unit control unit 19.

[0033] (2-1-1) Case 10a The case 10a houses components of the heat source heat exchanger unit 10. The case 10a is made of, for example, metal.

[0034] (2-1-2) Heat source heat exchanger 11 The heat source heat exchanger 11 functions as a heat source. The heat source heat exchanger 11 exchanges heat between the air outside the building B and the refrigerant R0. In the case of cold heat utilization operation, the heat source heat exchanger 11 functions as a heat radiator (or a condenser) of the refrigerant R0. In the case of hot heat utilization operation, the heat source heat exchanger 11 functions as a heat absorber (or an evaporator) of the refrigerant R0.

[0035] (2-1-3) Heat source fan 12 The heat source fan 12 promotes heat exchange in the heat source heat exchanger 11 by generating an air flow.

[0036] (2-1-4) Heat source heat exchanger unit expansion valve 13 The heat source heat exchanger unit expansion valve 13 reduces the pressure of the refrigerant R0. The heat source heat exchanger unit expansion valve 13 is a valve whose opening degree can be adjusted.

[0037] (2-1-5) Heat source heat exchanger unit control section 19 The heat source heat exchanger unit control unit 19 includes a microcomputer and a memory. The heat source heat exchanger unit control unit 19 controls the heat source fan 12, the heat source heat exchanger unit expansion valve 13, etc. The memory stores software for controlling these components.

[0038] The heat source heat exchanger unit control section 19 transmits and receives data and commands to and from a compressor unit control section 29 and a utilization unit control section 59, which will be described later, via communication lines (not shown).

[0039] (2-2) Compressor unit 20 The compressor unit 20 has an appearance shown in Fig. 2. As shown in Fig. 1, the compressor unit 20 is disposed inside a building B. The compressor unit 20 has a case 20a, a compressor 21, a four-way switching valve 22, a connection port 60, a leakage detection sensor 61, a compressor unit control unit 29, and a fan 69.

[0040] (2-2-1) Case 20a The case 20a accommodates components of the compressor unit 20. The case 20a is made of, for example, metal.

[0041] (2-2-2) Compressor 21 The compressor 21 generates the refrigerant R0 in a high-pressure gas state by compressing the refrigerant R0 in a low-pressure gas state that is drawn in. The compressor 21 has a compressor motor 21a. The compressor motor 21a generates power required for compression.

[0042] Since the compressor 21 is a vibration source, there is a concern that the refrigerant may leak from the compressor 21 and components adjacent thereto.

[0043] (2-2-3) Four-way switching valve 22 The four-way switching valve 22 switches the connections of the refrigerant circuit. In the case of cold heat utilization operation, the four-way switching valve 22 realizes the connections shown by the solid lines in Fig. 1. In the case of hot heat utilization operation, the four-way switching valve 22 realizes the connections shown by the dashed lines in Fig. 1.

[0044] (2-2-4) Connection port 60 The connection port 60 is a port for connecting the communication pipe. The connection port 60 includes a first connection port 23 and a second connection port .

[0045] A first connection pipe 30, which will be described later, is connected to the first connection port 23. A first liquid side shutoff valve 23a and a first gas side shutoff valve 23b are disposed in the first connection port 23.

[0046] A second connection pipe 40, which will be described later, is connected to the second connection port 28. A second liquid side shutoff valve 28a and a second gas side shutoff valve 28b are disposed in the second connection port 28.

[0047] The first liquid side shutoff valve 23a, the first gas side shutoff valve 23b, the second liquid side shutoff valve 28a, and the second gas side shutoff valve 28b shut off the refrigerant flow path in response to the received command. Note that in this specification, the first liquid side shutoff valve 23a, the first gas side shutoff valve 23b, the second liquid side shutoff valve 28a, and the second gas side shutoff valve 28b may be collectively referred to as shutoff valve 67.

[0048] (2-2-5) Leak detection sensor 61 The leakage detection sensor 61 detects leakage of the refrigerant R0. The leakage detection sensor 61 is a refrigerant detection sensor 61a that detects the presence of the refrigerant R0.

[0049] (2-2-6) Compressor unit control section 29 The compressor unit control unit 29 has a circuit board, and a microcomputer, a memory, an electrical component 74, and a heat sink 75 mounted on the circuit board. The electrical component 74 generates heat. The heat sink 75 effectively dissipates the heat generated by the electrical component 74 into the air.

[0050] The compressor unit control unit 29 controls the compressor motor 21a, the four-way switching valve 22, the first liquid side shutoff valve 23a, the first gas side shutoff valve 23b, the second liquid side shutoff valve 28a, the second gas side shutoff valve 28b, the fan 69, etc. The compressor unit control unit 29 acquires a signal from the leakage detection sensor 61. The memory stores software for controlling these components.

[0051] The compressor unit control section 29 transmits and receives data and commands to and from the heat source heat exchanger unit control section 19 and a utilization unit control section 59 (described later) via communication lines (not shown).

[0052] (2-2-7) Fan 69 The fan 69 creates a circulating air current that hits the circuit board, thereby cooling the microcomputer, memory, electrical components 74, and heat sink 75 that constitute the compressor unit control section 29.

[0053] (2-3) First connecting pipe 30 The first connection pipe 30 connects the heat source heat exchanger unit 10 and the compressor unit 20. The first connection pipe 30 has a first liquid connection pipe 31 and a first gas connection pipe 32.

[0054] (2-3-1) First liquid connection pipe 31 The first liquid connection pipe 31 connects the heat source heat exchanger unit 10 and the first liquid side shutoff valve 23a. The first liquid connection pipe 31 mainly guides the refrigerant R0 in a high pressure liquid state or a low pressure gas-liquid two-phase state.

[0055] (2-3-2) First gas connection pipe 32 The first gas connection pipe 32 connects the heat source heat exchanger unit 10 and the first gas side cutoff valve 23b. The first gas connection pipe 32 mainly guides the refrigerant R0 in a high pressure gas state or a low pressure gas state.

[0056] (2-4) Usage units 501, 502 The utilization units 501 and 502 have the appearance shown in Fig. 3. As shown in Fig. 1, the utilization units 501 and 502 are arranged inside building B. Since the utilization units 501 and 502 have the same configuration, only the utilization unit 501 will be described below, and a description of the utilization unit 502 will be omitted. The utilization unit 501 has a case 50a, a utilization unit expansion valve 51, a utilization heat exchanger 52, a utilization fan 53, and a utilization unit control unit 59.

[0057] (2-4-1) Case 50a The case 50a houses the components of the utilization unit 501.

[0058] (2-4-2) Utilization unit expansion valve 51 The utilization unit expansion valve 51 reduces the pressure of the refrigerant R0. The utilization unit expansion valve 51 limits the flow rate of the refrigerant R0. The utilization unit expansion valve 51 is a valve whose opening degree can be adjusted.

[0059] (2-4-3) Utilized heat exchanger 52 The utilization heat exchanger 52 provides cold or hot heat to a user. The utilization heat exchanger 52 exchanges heat between the air inside the building B and the refrigerant R0. In the case of cold heat utilization operation, the utilization heat exchanger 52 functions as a heat absorber (or an evaporator) of the refrigerant R0. In the case of hot heat utilization operation, the utilization heat exchanger 52 functions as a heat radiator (or a condenser) of the refrigerant R0.

[0060] (2-4-4) 53 fans in use The utilization fan 53 promotes heat exchange in the utilization heat exchanger 52 by generating an air flow.

[0061] (2-4-5) Utilization unit control unit 59 The utilization unit control unit 59 includes a microcomputer and a memory. The utilization unit control unit 59 controls the utilization unit expansion valve 51, the utilization fan 53, etc. The memory stores software for controlling these components.

[0062] The utilization unit control unit 59 transmits and receives data and commands to and from the heat source heat exchanger unit control unit 19 and the compressor unit control unit 29 via communication lines (not shown).

[0063] (2-5) Second connecting pipe 40 The second connection pipe 40 connects the compressor unit 20 to the utilization units 501 and 502. The second connection pipe 40 has a second liquid connection pipe 41 and a second gas connection pipe 42.

[0064] (2-5-1) Second liquid connection pipe 41 The second liquid communication pipe 41 connects the second liquid side shutoff valve 28a and the utilization units 501, 502. The second liquid communication pipe 41 mainly guides refrigerant R0 in a high pressure liquid state or a low pressure gas-liquid two-phase state.

[0065] (2-5-2) Second gas connection pipe 42 The second gas connection pipe 42 connects the second gas side cutoff valve 28b and the utilization units 501, 502. The second gas connection pipe 42 mainly guides the refrigerant R0 in a high pressure gas state or a low pressure gas state.

[0066] (3) Refrigerant circuit configuration The refrigeration device 100 constitutes one refrigerant cycle C0 as a whole. The refrigerant cycle C0 circulates a refrigerant R0. The refrigerant cycle C0 uses a heat source heat exchanger 11 as a heat source. The components belonging to the refrigerant cycle C0 include a compressor 21, a four-way switching valve 22, a first gas side shutoff valve 23b, the heat source heat exchanger 11, a heat source heat exchanger unit expansion valve 13, a first liquid side shutoff valve 23a, a second liquid side shutoff valve 28a, a utilization unit expansion valve 51, a utilization heat exchanger 52, and a second gas side shutoff valve 28b.

[0067] (4) Operation of the refrigeration device 100 In the following description, the refrigerant R0 will be described as undergoing a reaction (condensation, evaporation) accompanied by a phase transition during heat exchange, however, the state of the refrigerant R0 is not limited to this, and the refrigerant R0 may undergo a reaction without a phase transition.

[0068] (4-1)Cold heat utilization operation The compressor 21 discharges the refrigerant R0 in a high-pressure gas state. The refrigerant R0 in the high-pressure gas state reaches the heat source heat exchanger 11 via the four-way switching valve 22 and the first gas side shutoff valve 23b. In the heat source heat exchanger 11, the refrigerant R0 condenses and becomes a high-pressure liquid state. The refrigerant R0 in the high-pressure liquid state reaches the heat source heat exchanger unit expansion valve 13. In the heat source heat exchanger unit expansion valve 13, the refrigerant R0 is decompressed and becomes a low-pressure gas-liquid two-phase state. The refrigerant R0 in the low-pressure gas-liquid two-phase state reaches the utilization unit expansion valve 51 via the first liquid side shutoff valve 23a and the second liquid side shutoff valve 28a. In the utilization unit expansion valve 51, the refrigerant R0 is further decompressed. The refrigerant R0 reaches the utilization heat exchanger 52. In the utilization heat exchanger 52, the refrigerant R0 evaporates and becomes a low-pressure gas state. In this process, the refrigerant R0 provides cold to the user. The refrigerant R0 in a low-pressure gas state passes through the second gas side cutoff valve 28b and the four-way switching valve 22 and reaches the compressor 21. The compressor 21 draws in the refrigerant R0 in a low-pressure gas state.

[0069] (4-2) Heat utilization operation The compressor 21 discharges the refrigerant R0 in a high-pressure gas state. The refrigerant R0 in the high-pressure gas state reaches the utilization heat exchanger 52 via the four-way switching valve 22 and the second gas side shutoff valve 28b. In the utilization heat exchanger 52, the refrigerant R0 condenses and becomes a high-pressure liquid state. In this process, the refrigerant R0 provides heat to the user. The refrigerant R0 in the high-pressure liquid state reaches the utilization unit expansion valve 51. In the utilization unit expansion valve 51, the refrigerant R0 is decompressed and becomes a low-pressure gas-liquid two-phase state. The refrigerant R0 in the low-pressure gas-liquid two-phase state reaches the heat source heat exchanger unit expansion valve 13 via the second liquid side shutoff valve 28a and the first liquid side shutoff valve 23a. In the heat source heat exchanger unit expansion valve 13, the refrigerant R0 is further decompressed. The refrigerant R0 reaches the heat source heat exchanger 11. In the heat source heat exchanger 11, the refrigerant R0 evaporates and becomes a low-pressure gas state. The refrigerant R0 in a low-pressure gas state passes through the first gas side cutoff valve 23b and the four-way switching valve 22 and reaches the compressor 21. The compressor 21 draws in the refrigerant R0 in a low-pressure gas state.

[0070] (4-3) Operation during refrigerant leakage When a refrigerant leak occurs inside the compressor unit 20, the refrigerant detection sensor 61a detects the refrigerant R0. An output signal from the refrigerant detection sensor 61a is received by a microcomputer in the compressor unit 20. The microcomputer transmits a command (or a control signal) for shutoff to the shutoff valve 67. Upon receiving the command, the shutoff valve 67 closes the refrigerant flow path.

[0071] (5) Features (5-1) The first connection pipe 30 and the second connection pipe 40 extending from the compressor unit 20 can be shut off by the shutoff valve 67. Therefore, when leakage of the refrigerant R0 occurs inside the compressor unit 20, the leaking refrigerant R0 can be prevented from reaching the outside of the compressor unit 20.

[0072] In this configuration, the compressor unit 20 and the heat source heat exchanger unit 10 are configured as separate units. Therefore, the refrigeration system 100 has a first connection pipe 30 (first liquid connection pipe 31, first gas connection pipe 32) that connects the compressor unit 20 and the heat source heat exchanger unit 10. The refrigeration system 100 having the long first connection pipe 30 uses a larger amount of refrigerant compared to a refrigeration system in which the compressor 21 and the heat source heat exchanger 11 are housed in the same unit. Even in this case, the provision of a shutoff valve 67 can suppress the diffusion of refrigerant leakage.

[0073] (5-2) The leakage detection sensor 61 detects leakage of the refrigerant R0. Therefore, based on the output signal of the leakage detection sensor 61, the shutoff valve 67 can be shut off.

[0074] The leakage detection sensor 61 is a refrigerant detection sensor 61a, and is therefore capable of directly detecting the leaking refrigerant R0.

[0075] (5-3) When leakage of the refrigerant R0 is detected, the compressor unit control unit 29 automatically closes the shutoff valve 67. This makes it possible to quickly prevent the refrigerant leakage. In addition, since the refrigerant R0 can be confined within the first connection pipe 30 or the heat source heat exchanger unit 11, the diffusion of the refrigerant leakage can be prevented.

[0076] (5-4) The compressor unit control section 29 is cooled by the circulating air current generated by the fan 69. Therefore, the heat generated by the electrical components 74 can be effectively dissipated by the circulating air current.

[0077] (6) Variations (6-1) Variation 1A 4 shows a refrigeration system 100 according to Modification 1A of the first embodiment. Unlike the above-described embodiments, this refrigeration system 100 has a compressor unit control section 29 disposed outside the case 20a.

[0078] According to this configuration, the heat generated by the circuit board constituting the compressor unit control section 29 can be effectively released.

[0079] (6-2) Variation 1B In the above-described embodiment, the heat source heat exchanger unit 10 is disposed outside the building B. Alternatively, the heat source heat exchanger unit 10 may be disposed inside the building B and fluidly connected to the outside of the building B. For example, as shown in FIG. 5, the heat source heat exchanger unit 10 may be disposed in a duct provided in the building B. The duct is fluidly connected to the outside of the building B and exchanges air with the outside of the building B.

[0080] With this configuration, the aesthetic appearance of building B is not marred.

[0081] (6-3) Variation 1C In the above embodiment, the number of utilization units 501, 502 is 2. Alternatively, the number of utilization units may be a number other than 2. For example, the number of utilization units may be 1, 3, or 4.

[0082] <Second embodiment> (1) Composition 6 is a circuit diagram of a refrigeration system 100 according to a second embodiment. Unlike the first embodiment, this refrigeration system 100 has a cascade heat exchanger 24 and configures two refrigerant cycles as a whole.

[0083] The first refrigeration cycle C1 circulates a first refrigerant R1. It is preferable to use a refrigerant with a low GWP value (global warming potential) as the first refrigerant R1. The first refrigerant R1 is, for example, R32 or carbon dioxide. The first refrigeration cycle C1 uses a heat source heat exchanger 11 as a heat source. Components belonging to the first refrigeration cycle C1 include a first compressor 21, a first four-way switching valve 22, a first gas side shutoff valve 23b, a heat source heat exchanger 11, a heat source heat exchanger unit expansion valve 13, a first liquid side shutoff valve 23a, a cascade heat exchanger 24, and the like.

[0084] The second refrigerant cycle C2 circulates the second refrigerant R2. It is preferable to use a refrigerant with a low GWP value as the second refrigerant R2. The second refrigerant R2 is, for example, R410A, R32, or carbon dioxide. The second refrigerant cycle C2 uses the cascade heat exchanger 24 as a heat source. The components belonging to the second refrigerant cycle C2 include the second compressor 25, the second four-way switching valve 26, the cascade heat exchanger 24, the compressor unit expansion valve 27, the utilization unit expansion valve 51, the utilization heat exchanger 52, the first gas side cutoff valve 23b, and the like.

[0085] (2) Features Even with this configuration, the first connection pipe 30 and the second connection pipe 40 extending from the compressor unit 20 can be shut off by the shutoff valve 67. Therefore, when leakage of the refrigerant R0 occurs inside the compressor unit 20, the leaking refrigerant R0 can be prevented from reaching the outside of the compressor unit 20.

[0086] (3) Modifications (3-1) Variation 2A 7 shows a refrigeration system 100 according to a modified example 2A of the second embodiment. Unlike the above-mentioned embodiments, this refrigeration system 100 has compressor unit control sections 291, 292 cooled by cooling refrigerant pipes 641, 642 via refrigerant jackets 651, 652, respectively. Furthermore, the case 20a of the compressor unit 20 is airtight. The leakage detection sensor 61 is a pressure sensor 61b. The case 20a is provided with a rupture disc 66. The rupture disc 66 is broken by a pressure exceeding a predetermined value.

[0087] According to this configuration, since the case 20a of the compressor unit 20 is airtight, heat generated by the circuit board tends to be trapped inside the case 20a. However, the heat generated by the circuit boards constituting the compressor unit control units 291 and 292 can be effectively released using the cooling refrigerant pipes 641 and 642, respectively. The cooling of the circuit boards may be achieved by disposing the compressor unit control unit 29 outside the case 20a, instead of the cooling refrigerant pipes 641 and 642. Alternatively, the cooling of the circuit boards may be achieved by employing a fan that generates a circulating airflow, instead of the cooling refrigerant pipes 641 and 642.

[0088] Furthermore, since the case 20a is airtight, the refrigerant R0 that has leaked into the compressor unit 20 can be prevented from reaching the outside of the compressor unit 20.

[0089] Furthermore, since the leakage detection sensor 61 is a pressure sensor 61b, leakage of the refrigerant R0 can be detected using a change in pressure.

[0090] Furthermore, since the case 20a has the rupture plate 66, the highly airtight case 20a can be prevented from bursting due to high internal pressure.

[0091] Furthermore, since the case 20a is airtight, noise from the compressor unit 20 can be suppressed.

[0092] Furthermore, when the case 20a is made of metal, it is highly effective in blocking electromagnetic noise.

[0093] (3-2) Variation 2B Each of the modified examples of the first embodiment may be applied to the second embodiment.

[0094] <Third embodiment> (1) Composition 8 is a circuit diagram of a refrigeration device 100 according to the third embodiment. Unlike the first embodiment, this refrigeration device 100 has a heat source 71, a fluid refrigerant heat exchanger 72, and a pump 73. The heat source 71 is disposed outside the building B. The fluid refrigerant heat exchanger 72 and the pump 73 are provided in the compressor unit 20.

[0095] The heat source 71, the fluid refrigerant heat exchanger 72, and the pump 73 constitute a circuit for circulating a fluid F such as water or brine.

[0096] The refrigerant cycle C0 circulates the refrigerant R0. The refrigerant cycle C0 uses as a heat source a fluid refrigerant heat exchanger 72. The fluid refrigerant heat exchanger 72 exchanges heat between the fluid F and the refrigerant R0.

[0097] The compressor unit 20 has a second liquid side shutoff valve 28a and a second gas side shutoff valve 28b arranged in the second connection port .

[0098] (2) Features According to this configuration, the second connection pipe 40 extending from the compressor unit 20 can be shut off by the second liquid side shutoff valve 28a and the second gas side shutoff valve 28b. Therefore, when leakage of the refrigerant R0 occurs inside the compressor unit 20, the leaking refrigerant R0 can be prevented from reaching the outside of the compressor unit 20.

[0099] (3) Modifications Each of the modified examples of the first embodiment or the second embodiment may be applied to the third embodiment.

[0100] <Conclusion> Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure described in the claims. [Explanation of symbols]

[0101] 10: Heat source heat exchanger unit 10a: Case (2nd case) 11:Heat source heat exchanger 20: Compressor unit 20a: Case (first case) 21: Compressor 23: First connection port 23a: First liquid side shutoff valve (first shutoff valve) 23b: First gas side shutoff valve (first shutoff valve) 28: Second connection port 28a: Second liquid side shutoff valve (second shutoff valve) (shutoff valve) 28b: Second gas side shutoff valve (second shutoff valve) (shutoff valve) 29: Compressor unit control section (control section) 30: First connecting pipe 40: Second connecting pipe (connecting pipe) 50a: Case (third case) 50b: Case 52: Utilization heat exchanger 60: Connection port 61: Leak detection sensor 61a: Refrigerant detection sensor 61b: Pressure sensor 64: Cooling refrigerant piping 66:Rupture disc 67:Shut-off valve 69: Fan 72: Heat exchanger between fluid refrigerants 74: Electrical components 75: Heat sink 100: Refrigeration equipment 501: Usage unit 502: Usage unit B: Building C0: Refrigerant cycle C1: First refrigerant cycle (refrigerant cycle) C2: Second refrigerant cycle (refrigerant cycle) F:Fluid R0: Refrigerant R1: First refrigerant (refrigerant) R2: Second refrigerant (refrigerant) [Prior art documents] [Patent documents]

[0102] [Patent Document 1] Special Publication No. 2018-511771

Claims

1. A first case (20a); A compressor (21) housed in the first case; a leakage detection sensor (61) housed in the first case and configured to detect leakage of the refrigerant; A control unit (29); a connection port (60) including a first liquid side connection port (23), a first gas side connection port (23), a second liquid side connection port (28), and a second gas side connection port (28); a shutoff valve (67) including a first liquid side shutoff valve (23a), a first gas side shutoff valve (23b), a second liquid side shutoff valve (28a), and a second gas side shutoff valve (28b), which is closed under control by the control unit; A compressor unit (20) comprising: The compressor, together with a heat source heat exchanger (11) and a utilization heat exchanger (52), forms a refrigerant cycle (C0, C1, C2) in which the heat source heat exchanger serves as a heat source and circulates a refrigerant (R0, R1, R2); The heat source heat exchanger is housed in a second case (10a) separated from the first case, The utilization heat exchanger is housed in a third case (50a) separated from the first case, The compressor unit is disposed inside a building (B), The first liquid side connection port (23) is connected to the heat source heat exchanger via a first liquid side communication pipe (31), The first gas side connection port (23) is connected to the heat source heat exchanger via a first gas side communication pipe (32), The second liquid side connection port (28) is connected to the utilization heat exchanger via a second liquid side communication pipe (41), The second gas side connection port (28) is connected to the utilization heat exchanger via a second gas side communication pipe (42), a first liquid-side shutoff valve (23a) for shutting off the movement of the refrigerant between the first liquid-side connection port (23) and the heat source heat exchanger; a first gas side shutoff valve (23b) for shutting off the movement of the refrigerant between the first gas side connection port (23) and the heat source heat exchanger; a second liquid-side shutoff valve (28a) for shutting off the movement of the refrigerant between the second liquid-side connection port (28) and the utilization heat exchanger; a second gas side shutoff valve (28b) for shutting off the movement of the refrigerant between the second gas side connection port (28) and the utilization heat exchanger; When the leakage detection sensor detects leakage of the refrigerant, the control unit controls the shutoff valve to close it. A compressor unit (20).

2. The control unit is disposed outside the first case. The compressor unit of claim 1.

3. A cooling refrigerant pipe (64) housed in the first case; Further equipped with The control unit is disposed inside the first case and is cooled by the cooling refrigerant piping. The compressor unit of claim 1.

4. The leakage detection sensor is a refrigerant detection sensor (61a) that detects the presence of the refrigerant. A compressor unit according to any one of claims 1 to 3.

5. The first case is airtight. A compressor unit according to any one of claims 1 to 3.

6. The leakage detection sensor is a pressure sensor (61b) that detects the pressure inside the first case. A compressor unit according to claim 5.

7. The first case has a rupture disk (66) that is ruptured by pressure exceeding a predetermined value. A compressor unit according to claim 5 or 6.

8. The refrigerant is R32 or carbon dioxide. A compressor unit according to any one of claims 1 to 7.

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