Heat source unit and refrigeration cycle system for refrigeration cycle system

Abstract

To suppress the rise in compressor discharge temperature caused by R32 refrigerant, a liquid injection circuit is required, which complicates the circuit. [Solution] The heat source unit 2 comprises an electrical component unit 70, a heat source side refrigerant main flow path 300, and a first refrigerant sub-flow path 46 having a first cooling section 47 for cooling the first part of the electrical component unit 70. The heat source side refrigerant main flow path 300 includes an accumulator 29, a compressor 21, a heat source side heat exchanger 23, and a heat source side expansion valve 25. The heat source side refrigerant main flow path 300 is connected to the user side refrigerant flow path 500 of the user units 3a and 3b to form a refrigerant circuit 10. The first refrigerant sub-flow path 46 branches off from a liquid flow path 340 extending from the heat source side heat exchanger 23 of the heat source side refrigerant main flow path 300 to the user side refrigerant flow path 500, and flows refrigerant into a gas flow path 310 between the accumulator 29 and the compressor 21 of the heat source side refrigerant main flow path 300.

Description

【Technical Field】 【0001】 Relates to a heat source unit of a refrigeration cycle device and a refrigeration cycle device. 【Background Art】 【0002】 Conventionally, there has been a cooling circuit for cooling an electrical component unit having one end connected to a liquid pipe and the other end connected to the upstream side of an accumulator (Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2022-146443)). 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0003】 In the conventional cooling circuit, in order to suppress the rise in the discharge temperature of the compressor by the R32 refrigerant, it is necessary to provide a liquid injection circuit, and there is a problem that the circuit becomes complicated. 【Means for Solving the Problems】 【0004】 The heat source unit of the refrigeration cycle device according to the first aspect includes an electrical component unit, a heat source side refrigerant main flow path, and a first refrigerant sub-flow path. The heat source side refrigerant main flow path has an accumulator, a compressor, a heat source side heat exchanger, and a heat source side main expansion mechanism. The heat source side refrigerant main flow path is connected to the utilization side refrigerant flow path of the utilization unit to form a refrigerant circuit. The first refrigerant sub-flow path has a first cooling unit that cools the first part of the electrical component unit. The first refrigerant sub-flow path branches from a liquid flow path extending from the heat source side heat exchanger of the heat source side refrigerant main flow path to the utilization side refrigerant flow path, and flows the refrigerant through a gas flow path between the accumulator and the compressor of the heat source side refrigerant main flow path. 【0005】 In this heat source unit of the refrigeration cycle device, the first refrigerant sub-flow path can be used for cooling the electrical component unit, and can also cool the gas refrigerant sucked into the compressor. 【0006】 The heat source unit of the refrigeration cycle device in the second aspect is the heat source unit in the first aspect, comprising a first flow rate adjustment mechanism and a control unit. The first flow rate adjustment mechanism adjusts the flow rate of refrigerant flowing through a first refrigerant subflow channel. The control unit controls the opening degree of the first flow rate adjustment mechanism based on the discharge pipe temperature of the compressor. 【0007】 In this refrigeration cycle system's heat source unit, when the compressor discharge pipe temperature rises, the opening of the first flow rate adjustment mechanism is increased to cool the gas refrigerant drawn into the compressor, thereby lowering the compressor discharge pipe temperature and protecting the compressor. 【0008】 The heat source unit of the refrigeration cycle system in the third perspective is the heat source unit in the second perspective, and the control unit controls the opening degree of the first flow rate adjustment mechanism based on the temperature of the compressor discharge pipe and the temperature of the electrical equipment unit. 【0009】 In this refrigeration cycle system's heat source unit, when the compressor discharge pipe temperature rises and the temperature of the electrical components rise, the opening of the first flow rate adjustment mechanism is increased to cool the gas refrigerant drawn into the compressor, thereby lowering the compressor discharge pipe temperature and achieving cooling of the electrical components. 【0010】 The heat source unit of the refrigeration cycle device in the fourth perspective is a heat source unit of either the first or third perspective, and the electrical component unit is enclosed within a housing. The first refrigerant subflow channel cools the housing space inside the housing. 【0011】 This heat source unit of the refrigeration cycle system lowers the discharge pipe temperature of the compressor and, compared to cooling electrical components, can cool the housing space containing the electrical components with a smaller amount of cooling. 【0012】 The heat source unit of the refrigeration cycle device in the fifth view is a heat source unit of any of the first to fourth views, and further comprises a second refrigerant subflow channel. The second refrigerant subflow channel has a second cooling section and a second flow rate adjustment mechanism. The second cooling section cools the second part of the electrical component unit. The second flow rate adjustment mechanism adjusts the amount of refrigerant flowing to the second cooling section. The second refrigerant subflow channel connects the liquid piping on the heat source side heat exchanger side of the heat source side main expansion mechanism to the liquid piping on the opposite side of the heat source side heat exchanger side of the heat source side main expansion mechanism. In the liquid flow channel extending from the heat source side heat exchanger of the heat source side refrigerant main flow channel to the utilization side refrigerant flow channel, the first refrigerant subflow channel is located at a position opposite to the heat source side heat exchanger side of the heat source side main expansion mechanism to which the second refrigerant subflow channel is connected, and the utilization side refrigerant Flow channel It branches off from the side. 【0013】 In the heat source unit of this refrigeration cycle system, the first refrigerant subflow channel is located in the liquid flow path, and the refrigerant flow in the second liquid flow path is located in the second refrigerant subflow channel. Flow channel By branching off from the side, it is possible to secure the amount of refrigerant needed for cooling in the second refrigerant subflow channel. 【0014】 The refrigeration cycle device of the sixth aspect comprises a heat source unit described in any of the first to fifth aspects and one or more utilization units. The one or more utilization units are connected to the heat source unit. 【0015】 In this refrigeration cycle system, the first refrigerant sub-flow channel can be used to cool the electrical components unit, and it can also be used to cool the gaseous refrigerant drawn into the compressor. [Brief explanation of the drawing] 【0016】 [Figure 1] This is a schematic diagram of the refrigeration cycle device according to this embodiment. [Figure 2] This is a schematic perspective view showing the arrangement of the heat source side control unit in the heat source unit. [Figure 3] This is a schematic plan view diagram of the internal structure of the heat source side control unit. [Figure 4]It is a schematic front view configuration diagram of the front side portion inside the heat source side control unit. [Figure 5] It is a schematic rear view configuration diagram of the rear side portion inside the heat source side control unit. 【Embodiments for Carrying Out the Invention】 【0017】 (1) Configuration of the Refrigeration Cycle Device FIG. 1 shows a schematic configuration diagram of the refrigeration cycle device 1. 【0018】 The refrigeration cycle device 1 is a device used for air conditioning and heating indoors such as in a building by performing a vapor compression refrigeration cycle operation. The refrigeration cycle device 1 mainly includes a heat source unit 2, utilization units 3a and 3b, and liquid-side refrigerant connection pipes 5 and gas-side refrigerant connection pipes 6 that connect the heat source unit 2 and the utilization units 3a and 3b. The refrigerant circuit 10 of the refrigeration cycle device 1 is constituted by connecting the heat source unit 2, the utilization units 3a and 3b, the liquid-side refrigerant connection pipe 5, and the gas-side refrigerant connection pipe 6. 【0019】 Note that the refrigerant circuit 10 of the present embodiment is filled with an arbitrary refrigerant such as R32. 【0020】 (1-1) Utilization Unit The utilization units 3a and 3b are installed by being embedded or suspended in the ceiling of a room in a building or the like, or by being wall-mounted on the wall surface of the room. The utilization units 3a and 3b are connected to the heat source unit 2 via the liquid-side refrigerant connection pipe 5 and the gas-side refrigerant connection pipe 6, and constitute a part of the refrigerant circuit 10. The utilization units 3a and 3b have utilization-side refrigerant flow paths 500 that are connected to the heat source-side refrigerant main flow path 100 to form the refrigerant circuit 10. 【0021】 Note that the refrigeration cycle device 1 of the present embodiment has a plurality (here, two) of utilization units 3a and 3b that are connected in parallel to each other in the refrigerant circuit 10. 【0022】 Next, the configuration of the usage units 3a and 3b will be described. Since the usage unit 3a and the usage unit 3b have the same configuration, here, only the configuration of the usage unit 3a will be described, and for the configuration of the usage unit 3b, each part will be described by attaching the suffix "b" instead of the suffix "a" indicating each part of the usage unit 3a, and the description of each part will be omitted. 【0023】 The usage unit 3a mainly includes a usage-side expansion valve 51a, a usage-side heat exchanger 52a, a usage-side fan 55a, and a usage-side control unit 75a. Also, the usage unit 3a has a side [[ID=Z6]]usage liquid refrigerant pipe 53a that connects the liquid side end of the usage heat exchanger 52a and the liquid refrigerant connection pipe 5, and a side usage gas refrigerant pipe 54a that connects the gas side end of the usage heat exchanger 52a and the gas refrigerant connection pipe 6. 【0024】 The usage-side heat exchanger 52a is, for example, a cross-fin type fin-and-tube heat exchanger composed of heat transfer tubes and a large number of fins. The usage-side heat exchanger 52a functions as an evaporator of the refrigerant during cooling operation to cool the indoor air, and functions as a radiator or condenser of the refrigerant during heating operation to warm the indoor air. A gas-side refrigerant connection pipe 6 is connected to the gas side of the usage-side heat exchanger 52a. 【0025】 [[ID=Z5]] The usage-side expansion valve 51a is composed of an electronic expansion valve whose valve opening can be adjusted. The usage-side expansion valve 51a is provided in the refrigerant flow path between the usage-side heat exchanger 52a and the liquid-side refrigerant connection pipe 5. 【0026】 The usage unit 3a has a usage-side fan 55a for sucking indoor air into the unit, exchanging heat with the refrigerant in the usage-side heat exchanger 52a, and then supplying it into the room as supply air. The usage-side fan 55a is a centrifugal fan, a multi-wing fan, or the like. The usage-side fan 55a has a usage-side fan motor 56a. 【0027】 The utilization unit 3a is equipped with various sensors. Specifically, the utilization unit 3a is equipped with a utilization-side heat exchanger liquid-side sensor 57a that detects the temperature Trl of the refrigerant at the liquid-side end of the utilization-side heat exchanger 52a, a utilization-side heat exchanger gas-side sensor 58a that detects the temperature Trg of the refrigerant at the gas-side end of the utilization-side heat exchanger 52a, and an indoor air sensor 59a that detects the temperature Tra of the indoor air drawn into the utilization unit 3a. 【0028】 The user-side control unit 75a controls the operation of each part that constitutes the user unit 3a. The user-side control unit 75a has a microcomputer, memory, etc., provided for controlling the user unit 3a. The user-side control unit 75a can exchange control signals, etc., with the heat source side control unit 70 of the heat source unit 2 or the remote control 9 via the transmission line 8. 【0029】 (1-2) Heat source unit The heat source unit 2 is installed outdoors in a building or similar structure and is connected to the respective user units 3a and 3b via liquid-side refrigerant connecting pipe 5 and gas-side refrigerant connecting pipe 6, forming part of the refrigerant circuit 10. 【0030】 Figure 2 shows a schematic external perspective view illustrating the arrangement of the heat source side control unit 70 in the heat source unit 2. In the following description, unless otherwise specified, "top," "bottom," "left," "right," "front," and "rear" refer to the direction when viewing the outdoor unit 2 shown in Figure 2 from the front (left-front side in the drawing). In this embodiment, "front" is defined as the direction where the surface without the heat source side heat exchanger 23 or the surface with the smallest portion of the heat source side heat exchanger 23 is located, when viewed from the center of the heat source unit 2 in a plan view. Figure 2 mainly illustrates the heat source side control unit 70, the surrounding first cooling section 47 and second cooling section 67, the heat source side heat exchanger 23, the heat source side fan 24, etc., while omitting other equipment and piping. 【0031】 The heat source unit 2 mainly includes a heat source unit casing 11, a compressor 21, a four-way switching valve 22, a heat source side heat exchanger 23, a heat source side expansion valve (heat source side main expansion mechanism) 25, an accumulator 29, a liquid side shut-off valve 27, a gas side shut-off valve 28, a first refrigerant sub-flow channel 46, a second refrigerant sub-flow channel 66, a heat source side fan 24, etc. The four-way switching valve 22 and the suction side of the compressor 21 are connected by an suction refrigerant pipe 31. The suction refrigerant pipe 31 is equipped with an accumulator 29 that temporarily stores the refrigerant drawn into the compressor 21. The discharge side of the compressor 21 and the four-way switching valve 22 are connected by a discharge refrigerant pipe 32. The four-way switching valve 22 and the gas side end of the heat source heat exchanger 23 are connected by a first heat source gas refrigerant pipe 33. The liquid side end of the heat source heat exchanger 23 and the liquid refrigerant connecting pipe 5 are connected by a heat source liquid refrigerant pipe 34. A liquid side shut-off valve 27 is provided at the connection point between the heat source liquid refrigerant pipe 34 and the liquid refrigerant connecting pipe 5. The four-way switching valve 22 and the gas refrigerant connecting pipe 6 are connected by a second heat source gas refrigerant pipe 35. A gas side shut-off valve 28 is provided at the connection point between the second heat source gas refrigerant pipe 35 and the gas refrigerant connecting pipe 6. The liquid side shut-off valve 27 and the gas side shut-off valve 28 are valves that are opened and closed manually. 【0032】 Furthermore, the heat source unit 2 includes an accumulator 29, a compressor 21, a heat source side heat exchanger 23, and a heat source side expansion valve 25, and is connected to the user side refrigerant flow path 500 of the user units 3a and 3b to form a refrigerant circuit 10. The liquid flow path 340 is a flow path that extends from the heat source side heat exchanger 23 of the heat source side refrigerant main flow path 300 to the user side flow path 500. The liquid flow path 340 includes a heat source liquid refrigerant pipe 34. The heat source liquid refrigerant pipe 34 includes a first heat source liquid refrigerant pipe 34a and a second heat source liquid refrigerant pipe 34b. The first heat source liquid refrigerant pipe 34a is the liquid piping on the heat source side heat exchanger 23 side of the heat source side expansion valve 25. The second heat source liquid refrigerant pipe 34b is the liquid piping on the opposite side of the heat source side heat exchanger 23 of the heat source side expansion valve 25. The gas flow path 310 is the suction-side flow path of the compressor 21 of the heat source-side refrigerant main flow path 300. The gas flow path 310 includes the suction refrigerant pipe 31. 【0033】 Furthermore, the heat source unit 2 includes a first refrigerant subflow channel 46 and a second ofIt has a refrigerant subflow channel 66, a third refrigerant subflow channel 41, and a fourth refrigerant subflow channel 61. 【0034】 In this embodiment, the heat source unit 2 is an upward-blowing type heat exchange unit that draws in air from the left and right sides and the back of the heat source unit casing 11 and blows the air upward from the upper end surface of the heat source unit casing 11. 【0035】 The heat source unit casing 11 mainly comprises a main section 13 and a fan module 12 provided on top of the main section 13. 【0036】 The main section 13 includes a pair of mounting legs 18, a base frame 15, four support columns 14, a front panel 13a, and mesh sections 13b, 13c, and 13d. The mounting legs 18 are located on the front and rear sides, and each extends in the left-right direction. The base frame 15 is spanned across each mounting leg 18. Each support column 14 extends vertically from the corner of the base frame 15. The front panel 13a extends between the two front support columns 14. The mesh section 13b is provided to extend front to back between the left support columns 14. The mesh section 13c is provided to extend left to right between the rear support columns 14. The mesh section 13d is provided to extend front to back between the right support columns 14. 【0037】 The bottom frame 15 forms the bottom surface of the heat source unit casing 11, and a heat source side heat exchanger 23 is provided on the bottom frame 15. Here, the heat source side heat exchanger 23 is a heat exchanger with a roughly U-shape in plan view that faces the back and both left and right sides of the heat source unit casing 11. 【0038】 Furthermore, each of the mesh sections 13b, 13c, and 13d described above is provided so as to extend along the outer surface of the heat source side heat exchanger 23. These mesh sections 13b, 13c, and 13d substantially form three intake ports on the right side, left side, and rear of the heat source unit casing 11. 【0039】 The front panel 13a includes an upper front panel 16 that constitutes the upper part of the front surface of the heat source unit casing 11, and a lower front panel 17 that constitutes the lower part of the front surface of the heat source unit casing 11. 【0040】 The fan module 12 is attached to the upper end of each support column 14. The fan module 12 is a roughly rectangular box-shaped body having a front side plate 12a, a left side plate 12b, a back side plate 12c, and a right side plate 12d, and is penetrating in the vertical direction. The fan module 12 houses the heat source side fan 24 inside, forming a flow path for air that flows upward. 【0041】 The compressor 21 is, for example, a positive displacement compressor driven by a compressor motor 21a. The compressor motor 21a is driven by power supplied via an inverter device. The operating capacity of the compressor 21 is variable by changing the rotational speed by changing the driving frequency of the compressor motor 21a. The discharge side of the compressor 21 is connected to one of the multiple connection ports of the four-way switching valve 22. In this embodiment, the compressor 21 is mounted on the bottom frame 15. 【0042】 The accumulator 29 is a refrigerant container located between the suction side of the compressor 21 and one of the multiple connection ports of the four-way switching valve 22. In this embodiment, the accumulator 29 is mounted on the bottom frame 15. 【0043】 The heat source side heat exchanger 23 is, for example, a cross-fin type fin-and-tube heat exchanger composed of heat transfer tubes and numerous fins. The heat source side heat exchanger 23 functions as a refrigerant radiator or condenser during cooling operation and as a refrigerant evaporator during heating operation. One of the multiple connection ports of the four-way switching valve 22 is connected to the gas side of the heat source side heat exchanger 23 via refrigerant piping. The heat source side expansion valve 25 is connected to the liquid side of the heat source side heat exchanger 23 via refrigerant piping. 【0044】 The heat source side fan 24 is housed within the fan module 12. The heat source side fan 24 draws in outside air from around the lower part of the heat source unit casing 11, and after heat exchange with the refrigerant in the heat source side heat exchanger 23, it forms an airflow that is discharged upward from an outlet provided on the upper end surface of the fan module 12. This heat source side fan 24 is a propeller fan or the like, driven by a heat source side fan motor 24a consisting of a DC fan motor, and has a variable airflow. In this embodiment, the heat source side fan motor 24a is driven by power supplied via an inverter device. 【0045】 The heat source side expansion valve 25 is an electrically operated expansion valve whose valve opening can be adjusted in order to regulate the flow rate of refrigerant flowing through the refrigerant circuit 10. The heat source side expansion valve 25 is connected to the liquid side outlet of the heat source side heat exchanger 23 and the liquid side closing valve. 27 It is provided between [the two points]. 【0046】 The four-way switching valve 22 has multiple connection ports. The four-way switching valve 22 switches the refrigerant circuit 10 between a cooling operation connection state and a heating operation connection state by switching the connection state of the multiple connection ports. In the cooling operation connection state, the discharge side of the compressor 21 is connected to the heat source side heat exchanger 23, and the suction side of the compressor 21 is connected to the gas side shut-off valve 28. In the heating operation connection state, the discharge side of the compressor 21 is connected to the gas side shut-off valve 28, and the suction side of the compressor 21 is connected to the heat source side heat exchanger 23. 【0047】 The liquid-side shut-off valve 27 is a valve provided at the connection port to the liquid-side refrigerant communication pipe 5. The liquid-side shut-off valve 27 is connected via refrigerant piping to the side of the heat source-side expansion valve 25 that is opposite to the heat source-side heat exchanger 23. The gas-side shut-off valve 28 is a valve provided at the connection port to the gas-side refrigerant communication pipe 6. The gas-side shut-off valve 28 is connected via refrigerant piping to one of the multiple connection ports of the four-way switching valve 22. 【0048】 The first refrigerant sub-flow channel 46, the second refrigerant sub-flow channel 66, and the fourth refrigerant sub-flow channel 61 are flow channels for cooling electrical components such as heat-generating components, which will be described later, that are located in the heat source side control unit (hereinafter also referred to as the electrical component unit) 70. 【0049】 The first refrigerant sub-flow channel 46 has a first cooling section 47 that cools the IPM (Intelligent Power Module, first electrical component) 81a and the IPM (Intelligent Power Module, second electrical component) 82a of the electrical component unit 70. The first refrigerant sub-flow channel 46 branches off from the liquid flow channel 340 that extends from the heat source side heat exchanger 23 of the heat source side refrigerant main flow channel 300 to the utilization side refrigerant flow channel 500, and flows refrigerant into the gas flow channel 310 between the accumulator 29 and the compressor 21 of the heat source side refrigerant main flow channel 300. In the liquid flow channel 340 that extends from the heat source side heat exchanger 23 of the heat source side refrigerant main flow channel 300 to the utilization side refrigerant flow channel 500, the first refrigerant sub-flow channel 46 is located at a position opposite to the heat source side heat exchanger 23 of the heat source side expansion valve 25 to which the second refrigerant sub-flow channel 66 is connected, Flow channel It branches off from the 500 side (see points G and H in Figure 1). In other words, the first refrigerant subflow channel 46 is connected to the portion of the heat source side liquid refrigerant pipe 34 between the heat source side expansion valve 25 and the subcooling heat exchanger 45 (see point G in Figure 1). The first refrigerant subflow channel 46 is also connected to the suction refrigerant pipe 31 through which the refrigerant drawn into the compressor 21 flows. Furthermore, the first refrigerant subflow channel 46 is connected to the portion of the suction refrigerant pipe 31 on the outlet side of the accumulator 29 (see point H in Figure 1). 【0050】 1 of The refrigerant subflow channel 46 has a first expansion valve (first flow rate adjustment mechanism) 48. The first expansion valve 48 is an electrically operated expansion valve. The first expansion valve 48 adjusts the amount of refrigerant flowing through the first refrigerant subflow channel 46. 【0051】 The second refrigerant subflow channel 66 includes a second cooling section 67 and a second expansion valve (second flow rate adjustment mechanism) 68. The second cooling section 67 further cools the IPM (Intelligent Power Module, second electrical component) 82a of the electrical component unit 70 (see Figure 3). The second expansion valve 68 adjusts the amount of refrigerant flowing to the second cooling section 67. The second expansion valve 68 consists of an electrically operated expansion valve. The second refrigerant subflow channel 66 connects the first heat source side liquid refrigerant pipe (liquid piping) 34a on the heat source side heat exchanger 23 side of the heat source side expansion valve 25 to the second heat source side liquid refrigerant pipe (liquid piping) 34b on the opposite side of the heat source side heat exchanger 23 of the heat source side expansion valve 25 (see points C and D in Figure 1). The second cooling unit 67 is provided to make thermal contact with the heat-generating components of the heat source side control unit 70, such as the electrical components, from the front via the second heat transfer member 67a described later, and to cool them. 【0052】 The fourth refrigerant sub-flow channel 61 includes a fourth cooling section 62 and a fourth expansion valve (fourth flow rate adjustment mechanism) 63. The fourth cooling section 62 further cools the IPM (Intelligent Power Module, first electrical component) 81a of the electrical component unit 70 (see Figure 3). The fourth expansion valve 63 expands the refrigerant flowing to the fourth cooling section 62. The fourth expansion valve 63 is an electrically operated expansion valve. The fourth refrigerant sub-flow channel 61 branches off from the liquid flow channel 340 that extends from the heat source side heat exchanger 23 of the heat source side refrigerant main flow channel 300 to the utilization side refrigerant flow channel 500, and flows refrigerant into the gas flow channel 310 on the suction side of the compressor 21 of the heat source side refrigerant main flow channel 300 (see points A and B in Figure 1). The fourth refrigerant sub-flow channel 61 branches off from a position on the side of the user-side refrigerant flow channel 500 rather than from a position on the opposite side of the heat source-side expansion valve 25 from the heat source-side heat exchanger 23, to which the second refrigerant sub-flow channel 66 is connected (see point A in Figure 1). The fourth cooling unit 62 is provided to make thermal contact with the heat-generating components of the heat source-side control unit 70 from the front via the fourth heat transfer member 62a, which will be described later, and to cool them. 【0053】 The third refrigerant sub-flow channel 41 branches off from the liquid flow channel 340 (see point E in Figure 1). The third refrigerant sub-flow channel 41 has a third expansion valve (third flow rate adjustment mechanism) 44 that expands the refrigerant flowing inside it. The third expansion valve 44 is an electrically operated expansion valve. The subcooled heat exchanger 45 is located in the liquid flow channel 340 that extends from the heat source side heat exchanger 23 to the utilization side refrigerant flow channel 500. The third refrigerant sub-flow channel 41 causes heat exchange between the refrigerant that has passed through the third expansion valve 44 and the refrigerant flowing in the liquid flow channel 340 of the heat source side refrigerant main flow channel 300 in the subcooled heat exchanger 45. The third refrigerant sub-flow channel 41 then flows the refrigerant after heat exchange into the gas flow channel 310 on the suction side of the compressor 21 of the heat source side refrigerant main flow channel 300 (see point F in Figure 1). In other words, the third refrigerant subflow channel 41 is a refrigerant pipe that sends refrigerant branched from the heat source side liquid refrigerant pipe 34 to the suction side of the compressor 21. The third refrigerant subflow channel 41 mainly consists of a refrigerant return inlet pipe 42 and a refrigerant return outlet pipe 43. The refrigerant return inlet pipe 42 is a refrigerant pipe that branches off a portion of the refrigerant flowing through the heat source side liquid refrigerant pipe 34 from the portion between the liquid side end of the heat source side heat exchanger 23 and the liquid side shut-off valve 27 (here, the portion between the heat source side expansion valve 25 and the subcooled heat exchanger 45) and sends it to the inlet of the subcooled heat exchanger 45 on the third refrigerant subflow channel 41 side. The refrigerant return outlet pipe 43 is a refrigerant pipe that sends refrigerant from the outlet of the subcooled heat exchanger 45 on the third refrigerant subflow channel 41 side to the suction refrigerant pipe 31. The refrigerant return outlet pipe 43 of the third refrigerant subflow channel 41 is connected to the portion of the suction refrigerant pipe 31 on the inlet side of the accumulator 29. 【0054】 The heat source unit 2 is equipped with various sensors. Specifically, the heat source unit 2 is equipped with a discharge pressure sensor 36 for detecting the pressure of the refrigerant discharged from the compressor 21 (discharge pressure Pd), a discharge temperature sensor 37 for detecting the temperature of the refrigerant discharged from the compressor 21 (discharge temperature Td, hereinafter also referred to as discharge pipe temperature Td), an intake pressure sensor 39 for detecting the pressure of the refrigerant drawn into the compressor 21 (intake pressure Ps), and an intake temperature sensor 40 for detecting the temperature of the refrigerant drawn into the compressor 21 (intake temperature Ts). The heat source unit 2 is also equipped with a heat source side heat exchanger. 23The heat source side heat exchange liquid side sensor 38 detects the refrigerant temperature Tol (outdoor heat exchange outlet temperature Tol) at the liquid side end, and the liquid pipe temperature sensor 49 detects the refrigerant temperature (liquid pipe temperature Tlp) in the portion of the heat source side liquid refrigerant pipe 34 between the heat source side expansion valve 25 and the liquid side shut-off valve 27. The heat source unit 2 is also equipped with an internal air temperature sensor 64 that detects the air temperature (internal air temperature Ta) near the electrical components of the electrical component unit 70. 【0055】 The heat source side control unit (electrical components unit) 70 is located in the heat source unit casing 11, below the fan module 12, towards the front, and facing the rear side of the upper front panel 16. More specifically, the heat source side control unit 70 is located in front of the compressor 21 and the accumulator 29. The heat source side control unit 70 can be accessed from the outside through an opening 16a that appears when the upper front panel 16 of the heat source unit casing 11 is removed. The opening 16a is bordered by a support column 14 located on the left front, a support column 14 located on the right front, the lower edge of the front plate 12a of the fan module 12, and the upper edge of the lower front panel 17, and opens in the front-to-back direction. The heat source side control unit 70 controls the operation of each part that constitutes the heat source unit 2. The heat source side control unit 70 has a microcomputer and memory provided for controlling the heat source unit 2, and controls the state of the compressor motor 21a, heat source side fan motor 24a, heat source side expansion valve 25, four-way switching valve 22, first expansion valve 48, second expansion valve 68, etc. The heat source side control unit 70 communicates with the user side control units 75a and 75b of each user unit 3a and 3b and the remote control 9 via transmission lines. 8 Control signals and other information can be exchanged via this. The above-mentioned user-side control units 75a and 75b and the heat source-side control unit 70 The remote control 9 and the remote control 9 are connected to each other by a transmission line 8, forming a control unit 7 that controls the operation of the entire refrigeration cycle system 1. 【0056】 The control unit 7 is connected to various sensors 36, 37, 38, 39, 40, 49, 57a, 57b, 58a, 58b, 59a, 59b, and 64 so as to be able to receive detection signals, and controls various devices based on these detection signals. The control unit 7 also has a CPU that executes the above-mentioned various controls, and a memory that stores information used for executing the various controls. 【0057】 (1-3) Refrigerant connecting piping The liquid-side refrigerant connecting pipe 5 and the gas-side refrigerant connecting pipe 6 are refrigerant pipes that are installed on-site when the refrigeration cycle unit 1 is installed at a building or other installation location. 【0058】 In this embodiment of the refrigeration cycle device 1 having multiple utilization units 3a and 3b, the liquid-side refrigerant communication pipe 5 has branched sections corresponding to each utilization unit 3a and 3b, and the gas-side refrigerant communication pipe 6 also has branched sections corresponding to each utilization unit 3a and 3b. 【0059】 (2) Refrigeration cycle in the refrigerant circuit In the refrigerant circuit 10 of the refrigeration cycle device 1, cooling and heating operations are mainly performed by switching the connection state of the four-way switching valve 22. 【0060】 (2-1) Cooling operation Cooling operation is performed with the four-way switching valve 22 switched so that the discharge side of the compressor 21 is on the heat source side heat exchanger 23 side, and the suction side of the compressor 21 is on the respective user side heat exchangers 52a and 52b sides. 【0061】 The compressor 21 is controlled to a frequency that, for example, handles the cooling load in each utilization unit 3a, 3b. As a result, the low-pressure refrigerant drawn into the compressor 21 is discharged from the compressor 21 as high-pressure refrigerant, which flows into the heat source side heat exchanger 23 via the four-way switching valve 22. 【0062】 The refrigerant flowing into the heat source side heat exchanger 23 releases its heat and condenses. The refrigerant flowing out of the heat source side heat exchanger 23 passes through the heat source side expansion valve 25, which is controlled to be fully open by the control unit 7 during cooling operation. 【0063】 The refrigerant that has passed through the heat source side expansion valve 25 is sent to the liquid side refrigerant connecting pipe 5 after passing through the liquid side shut-off valve 27. 【0064】 The refrigerant flowing through the liquid-side refrigerant communication pipe 5 is branched and then sent to each utilization unit 3a and 3b. 【0065】 The refrigerant flowing into each utilization unit 3a and 3b is reduced in pressure by the utilization-side expansion valves 51a and 51b until it reaches the low pressure of the refrigeration cycle. The valve opening of the utilization-side expansion valves 51a and 51b is controlled by the control unit 7, for example, so that the superheating of the refrigerant at the outlet side of the utilization-side heat exchangers 52a and 52b reaches a predetermined target superheating level. 【0066】 The refrigerant, which has been depressurized in the respective utilization-side expansion valves 51a and 51b of each utilization unit 3a and 3b, evaporates in the respective utilization-side heat exchangers 52a and 52b. 52a, 52b The refrigerant that has evaporated in the gas side merges and flows through the gas-side refrigerant connecting pipe 6. 【0067】 The refrigerant that has flowed through the gas-side refrigerant communication pipe 6 is drawn back into the compressor 21 via the gas-side shut-off valve 28, the four-way switching valve 22, and the accumulator 29 of the heat source unit 2. 【0068】 In cooling operation, a first refrigerant sub-flow channel 46 is used to branch off a portion of the refrigerant flowing through the heat source side liquid refrigerant pipe 34 at the portion of the heat source side liquid refrigerant pipe 34 that is closer to the heat source side heat exchanger 23 than to the subcooled heat exchanger 45, thereby supplying refrigerant to the compressor 21. 【0069】 The first refrigerant sub-flow channel 46 cools the internal storage space of the electrical component casing 70a. In other words, the first refrigerant sub-flow channel 46 cools the internal air of the electrical component unit 70. The control unit 7 controls the opening degree of the first expansion valve 48 based on the discharge temperature (discharge pipe temperature) Td of the compressor 21. When the discharge temperature Td rises to the discharge temperature threshold Tdx, the control unit 7 controls the opening degree of the first expansion valve 48 to increase until the discharge temperature Td falls below the discharge temperature threshold Tdx. 【0070】 Furthermore, during cooling operation, the high-temperature, high-pressure liquid refrigerant condensed in the heat source side heat exchanger 23 flows through the second refrigerant sub-flow channel 66 to cool the electrical component unit 70. The control unit 7 controls the opening degree of the second expansion valve 68 based on the temperature of the electrical component unit 70. In other words, the control unit 7 adjusts the opening degree of the second expansion valve 68 based on the internal air temperature Ta detected by the internal air temperature sensor 64. 【0071】 Furthermore, during cooling operation, the refrigerant in a gas-liquid two-phase state evaporates by the fourth expansion valve 63 located in the fourth refrigerant sub-flow path 61, absorbing heat from the electrical equipment unit 70, and returns to the gas flow path 310 on the suction side of the compressor 21. The control unit 7 controls the opening degree of the fourth expansion valve 63 based on the temperature of the electrical equipment unit 70. In other words, the control unit 7 controls the opening degree of the fourth expansion valve 63 based on the internal air temperature Ta detected by the internal air temperature sensor 64. 【0072】 Furthermore, during cooling operation, a third refrigerant sub-flow channel 41 branches off a portion of the refrigerant flowing through the heat source side liquid refrigerant pipe 34 and sends it to the compressor 21. A subcooling heat exchanger 45 cools the portion of the heat source side liquid refrigerant pipe 34 that flows on the heat source side heat exchanger 23 side of the liquid side shut-off valve 27 using the refrigerant flowing through the third refrigerant sub-flow channel 41. This operation cools the portion of the heat source side liquid refrigerant pipe 34 between the subcooling heat exchanger 45 and the heat source side heat exchanger 23. The control unit 7 controls the opening of the third expansion valve 44 to increase when the liquid pipe temperature Tlp is higher than the target liquid pipe temperature Tlpt, and controls the opening of the third expansion valve 44 to decrease when the liquid pipe temperature Tlp is lower than the target liquid pipe temperature Tlpt. 【0073】 (2-2) Heating operation Heating operation is performed with the four-way switching valve 22 switched so that the discharge side of the compressor 21 is connected to the respective user-side heat exchangers 52a and 52b, and the suction side of the compressor 21 is connected to the heat source-side heat exchanger 23. 【0074】 The compressor 21 is controlled by frequency to handle, for example, the heating load in each utilization unit. As a result, the high-pressure refrigerant discharged from the compressor 21 flows to each utilization unit 3a, 3b via the four-way switching valve 22 and the gas-side refrigerant communication pipe 6. 【0075】 Here, the refrigerant that has passed through the gas-side refrigerant communication pipe 6 branches off and flows into the respective utilization units 3a and 3b. 【0076】 The refrigerant flowing into each utilization unit 3a and 3b dissipates heat and condenses in each utilization-side heat exchanger 52a and 52b. During heating operation, the valve opening of each utilization-side expansion valve 51a and 51b is controlled, for example, so that the degree of subcooling of the refrigerant flowing out of the outlets of the utilization-side heat exchangers 52a and 52b reaches a predetermined value. 【0077】 In this way, the refrigerants that condense in each of the user-side heat exchangers 52a and 52b and pass through each of the user-side expansion valves 51a and 51b merge and flow through the liquid-side refrigerant connecting pipe 5. 【0078】 The refrigerant flowing through the liquid-side refrigerant communication pipe 5 is supplied to the heat source unit 2 through the liquid-side shut-off valve 27. After passing through the liquid-side shut-off valve 27, the refrigerant is reduced in pressure to the low pressure of the refrigeration cycle in the heat source side expansion valve 25. Specifically, for example, the valve opening of the heat source side expansion valve 25 is controlled so that the superheating degree of the refrigerant flowing on the suction side of the compressor 21 reaches the target superheating degree. 【0079】 The refrigerant sent to the heat source side heat exchanger 23 evaporates and is then drawn back into the compressor 21 via the four-way switching valve 22 and the accumulator 29. 【0080】 In heating operation, the control unit 7 fully closes the opening of the first expansion valve 48, and the first of The control unit 7 prevents refrigerant from flowing through the refrigerant sub-flow channel 46. In addition, the control unit 7 closes the opening of the second expansion valve 68 to a fully closed state. of The control unit 7 prevents refrigerant from flowing through the refrigerant sub-flow channel 66. Furthermore, the control unit 7 closes the fourth expansion valve 63 to prevent refrigerant from flowing through the fourth refrigerant sub-flow channel 61. Also, the control unit 7 closes the third expansion valve 44 to prevent refrigerant from flowing through the fourth refrigerant sub-flow channel 61. of Refrigerant subflow channels 41 and 1 of The refrigerant is not allowed to flow through the refrigerant sub-flow channel 46. 【0081】 (3) Configuration of the heat source side control unit Figure 3 is a schematic plan view of the interior of the heat source side control unit 70. Figure 4 is a schematic front view of the front portion of the interior of the heat source side control unit 70. Figure 5 is a schematic rear view of the rear portion of the interior of the heat source side control unit 70. 【0082】 The heat source side control unit (electrical component unit) 70 includes an electrical component casing (enclosure) 70a, a first circuit board 81, and a second circuit board 82. The heat source side control unit 70 may also have other circuit boards. The electrical component unit 70's enclosure is sealed by the electrical component casing 70a. 【0083】 The electrical component casing 70a has a rear surface 77, a top surface 75, a bottom surface 76, a right side surface 74, a left side surface 73, a front cover 72, and a partition plate 71. The partition plate 71 extends vertically and horizontally to divide the interior of the electrical component casing 70a into a front side and a rear side. The partition plate 71 is located near the center in the front-to-back direction inside the electrical component casing 70a. As a result, the interior of the electrical component casing 70a is divided into a first space S1 which is on the rear side relative to the partition plate 71, and a second space S2 which is on the front side relative to the partition plate 71. For example, the second space S2 may be further divided into an upper space and a lower space by another partition plate. 【0084】 The first substrate 81 and the second substrate 82 are both plate-shaped members that extend in the vertical, horizontal, and vertical directions, and have a rectangular shape when viewed from the front, and are fixed to the partition plate 71. 【0085】 The first circuit board 81 is equipped with an Intelligent Power Module (IPM, first electrical component) 81a, which is an electrical component for the inverter of the compressor 21 and is a heat-generating component. The second circuit board 82 is equipped with an Intelligent Power Module (IPM, second electrical component) 82a, which is an electrical component used for the heat source side fan 24 and is a heat-generating component. The amount of heat generated by the IPM (first electrical component) 81a is greater than the amount of heat generated by the IPM (second electrical component) 82a. Both IPM 81a and IPM 82a are housed in the first space S1. 【0086】 (4) Cooling by the first refrigerant subflow channel The first refrigerant sub-flow channel 46 cools the internal air of the electrical component casing 70a, and the IPM 81a and IPM 82a are cooled by the air cooled by the first refrigerant sub-flow channel 46. 【0087】 As shown in Figure 5, the first space S1 of the heat source side control unit 70 is the first of It is cooled by the first cooling section 47 of the refrigerant subflow channel 46. of The first cooling section 47 of the refrigerant subflow channel 46 is provided so as to be in thermal contact with the electrical component casing 70a from the rear side via a first heat transfer member 47a. The first heat transfer member 47a has a plane that extends parallel to the rear surface 77 of the electrical component casing 70a, and is used so that this plane is in surface contact with the rear surface 77. The first cooling section 47 extends from the lower end to the upper end on the rear side of the electrical component casing 70a, then folds back via a U-shape and extends to the lower end. 【0088】 Thus, in the first space S1 of the heat source side control unit 70, of The first cooling section 47 of the refrigerant subflow channel 46 cools the internal air of the electrical component casing 70a, thereby cooling the heat-generating components IPM 81a and IPM 82a. 【0089】 (5) Cooling by a second refrigerant subflow channel On the side of the partition plate 71 of the heat source side control unit 70 that faces the second space S2, of The second cooling section 67 of the refrigerant subflow channel 66 is provided to be in thermal contact with the second heat transfer member 67a. The second heat transfer member 67a has a plane that extends parallel to the partition plate 71, and is used so that this plane is in surface contact with the partition plate 71. The second cooling section 67 extends from the lower end to the upper end on the front side of the electrical component casing 70a, then folds back via a U-shape and extends to the lower end. 【0090】 The partition plate 71 of the heat source side control unit 70 is second of The IPM82a, a heat-generating component located on the back side of the partition plate 71, can be further cooled by being cooled by the second cooling section 67 of the refrigerant subflow channel 66. 【0091】 If IPM82a is provided on the front side of partition plate 71, the second of The second cooling section 67 of the refrigerant subflow channel 66 may be provided so as to be in thermal contact with the partition plate 71 from the rear side via the second heat transfer member 67a. 【0092】 (6) Cooling by a fourth refrigerant subflow channel On the side of the partition plate 71 of the heat source side control unit 70 facing the second space S2, there is a fourth of The fourth cooling section 62 of the refrigerant subflow channel 61 is provided to be in thermal contact with the fourth heat transfer member 62a. The fourth heat transfer member 62a has a plane that extends parallel to the partition plate 71, and is used so that this plane is in surface contact with the partition plate 71. The fourth cooling section 62 extends from the lower end to the upper end on the front side of the electrical component casing 70a, then folds back via a U-shape and extends to the lower end. 【0093】 The partition plate 71 of the heat source side control unit 70 is the fourth ofThe IPM (first electrical component) 81a, which is a heat-generating component located on the back side of the partition plate 71, can be further cooled by being cooled by the fourth cooling section 62 of the refrigerant subflow channel 61. 【0094】 If an IPM81a is provided on the front side of the partition plate 71, the fourth of The fourth cooling section 62 of the refrigerant subflow channel 61 may be provided so as to be in thermal contact with the partition plate 71 from the rear side via the first heat transfer member 62a. 【0095】 (7) Characteristics (7-1) The heat source unit 2 of the refrigeration cycle device 1 according to this embodiment comprises an electrical component unit 70, a heat source side refrigerant main flow path 300, and a first refrigerant sub-flow path 46. The heat source side refrigerant main flow path 300 includes an accumulator 29, a compressor 21, a heat source side heat exchanger 23, and a heat source side expansion valve 25. The heat source side refrigerant main flow path 300 is connected to the user side refrigerant flow path 500 of the user units 3a and 3b to form a refrigerant circuit 10. The first refrigerant sub-flow path 46 has a first cooling section 47 that cools the IPM 81a and IPM 82a of the electrical component unit 70. The first refrigerant sub-flow channel 46 branches off from the liquid flow channel 340 that extends from the heat source side heat exchanger 23 to the user side refrigerant flow channel 500 in the heat source side refrigerant main flow channel 300, and flows refrigerant into the gas flow channel 310 between the accumulator 29 and the compressor 21 in the heat source side refrigerant main flow channel 300. 【0096】 Conventional cooling circuits for electrical components have one end connected to a liquid pipe and the other end connected to the upstream side of the accumulator. Furthermore, with the use of R32 as the refrigerant, a liquid injection circuit is required to suppress the rise in discharge pipe temperature, which complicates the circuit and increases costs. 【0097】 In this refrigeration cycle system 1, the first refrigerant sub-flow channel 46 that cools the electrical component unit 70 has a liquid injection function, and the outlet of the first refrigerant sub-flow channel 46 is merged between the compressor 21 and the accumulator 29. This reduces costs. Also, when R32 refrigerant is introduced into the accumulator 29, the injection effect is diminished. In this refrigeration cycle system 1, the reduction in the injection effect can be suppressed by directly injecting liquid refrigerant into the compressor 21. 【0098】 In the heat source unit 2 of this refrigeration cycle device 1, the first refrigerant subflow channel 46 can be used to cool the electrical component unit 70, and can also be used to cool the gaseous refrigerant drawn into the compressor 21. 【0099】 (7-2) The heat source unit 2 of the refrigeration cycle device 1 according to this embodiment includes a first expansion valve 48 and a control unit 7. The first expansion valve 48 adjusts the flow rate of refrigerant flowing through the first refrigerant subflow channel 46. The control unit 7 controls the opening degree of the first expansion valve 48 based on the discharge temperature Td of the compressor 21. 【0100】 The control unit 7 uses the discharge temperature Td of the compressor 21 as a substitute temperature for the temperature of the internal port of the compressor 21, which cannot be directly detected. This makes it possible to ensure the necessary cooling capacity and protect the compressor 21 at the same time. 【0101】 In the heat source unit 2 of this refrigeration cycle device 1, when the discharge temperature Td of the compressor 21 rises, the opening of the first expansion valve 48 is increased to cool the gaseous refrigerant drawn into the compressor 21, thereby lowering the discharge temperature Td of the compressor 21 and protecting the compressor 21. 【0102】 (7-3) In the heat source unit 2 of the refrigeration cycle device 1 according to this embodiment, the electrical component unit 70 has its housing space sealed by the electrical component casing 70a. The first refrigerant subflow channel 46 cools the housing space inside the electrical component casing 70a. 【0103】 In this refrigeration cycle device 1, the heat source unit 2 lowers the discharge pipe temperature Td of the compressor 21 and allows the housing space for electrical components to be cooled with a smaller amount of cooling compared to when cooling electrical components. 【0104】 (7-4) The heat source unit 2 of the refrigeration cycle device 1 according to this embodiment further includes a second refrigerant subflow channel 66. The second refrigerant subflow channel 66 has a second cooling section 67 and a second expansion valve 68. The second cooling section 67 cools the second part of the electrical component unit 70. The second expansion valve 68 adjusts the amount of refrigerant flowing to the second cooling section 67. The second refrigerant subflow channel 66 connects the first heat source side liquid refrigerant pipe 34a on the heat source side heat exchanger 23 side of the heat source side expansion valve 25 and the second heat source side liquid refrigerant pipe 34b on the opposite side of the heat source side heat exchanger 23 of the heat source side expansion valve 25. The first refrigerant sub-flow channel 46 is located in the liquid flow channel 340 extending from the heat source side heat exchanger 23 of the heat source side refrigerant main flow channel 300 to the utilization side refrigerant flow channel 500, and is positioned at a location opposite to the heat source side heat exchanger 23 of the heat source side expansion valve 25 to which the second refrigerant sub-flow channel 66 is connected, and is located at a location opposite to the heat source side heat exchanger 23 of the heat source side refrigerant Flow channel It branches off from the position on the 500 side. 【0105】 In the heat source unit 2 of this refrigeration cycle device 1, the first refrigerant subflow channel 46 is located in the liquid flow channel 340, and the refrigerant flow in the second refrigerant subflow channel 66 is located in the first refrigerant subflow channel 46, which is located in the second refrigerant subflow channel 66. Flow channel By branching off from the 500 side, it is possible to secure the amount of refrigerant needed for cooling in the second refrigerant subflow channel 66. 【0106】 (7-5) The refrigeration cycle device 1 according to this embodiment comprises a heat source unit 2 and utilization units 3a and 3b. The utilization units 3a and 3b are connected to the heat source unit 2. 【0107】 In this refrigeration cycle device 1, the first refrigerant sub-flow channel 46 can be used to cool the electrical component unit 70, and can also be used to cool the gaseous refrigerant drawn into the compressor 21. 【0108】 (8) Variations (8-1) Variation 1A The refrigeration cycle device 1 is not limited to devices used for both cooling and heating; it may also be a device used solely for cooling. 【0109】 (8-2) Variation 1B The control unit 7 may control the opening degree of the first expansion valve 48 based on the discharge temperature Td of the compressor and the temperature of the electrical equipment unit 70. The temperature of the electrical equipment unit 70 may be detected by detecting the internal air temperature Ta with the internal air temperature sensor 64, or by detecting the temperature of the air in the space S1 of the electrical equipment unit 70 with a sensor (not shown). 【0110】 In modified example 1B, when the discharge pipe temperature Td of the compressor 21 rises and the temperature of the electrical equipment unit 70 rises, the opening of the first expansion valve 48 is increased to cool the gaseous refrigerant drawn into the compressor 21, thereby lowering the discharge temperature Td of the compressor 21 and also achieving cooling of the electrical equipment unit 70. 【0111】 (8-3) While embodiments of this disclosure have been described above, it should be understood that various modifications to the form and details are possible without departing from the spirit and scope of this disclosure as described in the claims. [Explanation of symbols] 【0112】 1. Refrigeration cycle system 2 Heat source units 3a, 3b Usage Units 5. Liquid refrigerant connecting piping 6. Gas refrigerant connecting piping 7 Control Unit 10 Refrigerant Circuit 11. Heat source unit casing 21 Compressor 23 Heat source side heat exchanger 24 Heat source side fan 25. Heat source side expansion valve (heat source side main expansion mechanism) 29 Accumulator 34a, 34b liquid piping 41 Third refrigerant subflow channel 44. Third expansion valve (third flow rate adjustment mechanism) 45 Supercooling heat exchanger (refrigerant cooler) 46 First refrigerant subflow channel 47 1st cooling section 48. First expansion valve (first flow rate adjustment mechanism) 61. Fourth refrigerant subflow channel 62 4th cooling section 63. Fourth expansion valve (fourth flow rate adjustment mechanism) 66 Second refrigerant subflow channel 67 Second cooling section 68. Second expansion valve (second flow rate adjustment mechanism) 70 Heat source side control unit (electrical equipment unit) 70a Electrical component casing (enclosure) 81 First board 81a IPM (First Electrical Parts) 82 Second board 82a IPM (Second Electrical Parts) 300 Heat source side refrigerant main flow path 310 Gas flow path 340 Liquid flow path 500 Refrigerant flow path on the user side [Prior art documents] [Patent Documents] 【0113】 [Patent Document 1] Japanese Patent Publication No. 2022-146443

Claims

[Claim 1] Electrical component unit (70), The system includes an accumulator (29), a compressor (21), a heat source side heat exchanger (23), and a heat source side main expansion mechanism (25), and is connected to the user side refrigerant flow path (500) of the user units (3a, 3b) to form a refrigerant circuit (10), and a heat source side refrigerant main flow path (300), A first refrigerant subflow channel (46) having a first cooling section (47) for cooling the first part of the electrical component unit, Equipped with, The first refrigerant sub-flow channel branches off from the liquid flow channel (340) of the heat source side refrigerant main flow channel, which extends from the heat source side heat exchanger to the utilization side refrigerant flow channel, and flows refrigerant into the gas flow channel (310) between the accumulator and the compressor of the heat source side refrigerant main flow channel. Heat source unit (2) of the refrigeration cycle system. [Claim 2] A first flow rate adjustment mechanism (48) for adjusting the flow rate of the refrigerant flowing through the first refrigerant subflow channel, Control unit (7) and Equipped with, The control unit controls the opening degree of the first flow rate adjustment mechanism based on the discharge pipe temperature (Td) of the compressor. A heat source unit for a refrigeration cycle apparatus according to claim 1. [Claim 3] The control unit controls the opening degree of the first flow rate adjustment mechanism based on the discharge pipe temperature of the compressor and the temperature of the electrical component unit. A heat source unit for a refrigeration cycle apparatus according to claim 2. [Claim 4] The electrical component unit is enclosed in a housing (70a), and the housing space is sealed by the housing. The first refrigerant subflow channel cools the containment space inside the containment. A heat source unit for a refrigeration cycle device according to any one of claims 1 to 3. [Claim 5] A second refrigerant subflow channel (66) has a second cooling section (67) for cooling the second part of the electrical component unit, and a second flow rate adjustment mechanism (68) for adjusting the amount of refrigerant flowing to the second cooling section. Furthermore, The second refrigerant subflow channel connects the liquid piping (34a) on the heat source side heat exchanger side of the heat source side main expansion mechanism to the liquid piping (34b) on the opposite side of the heat source side heat exchanger side of the heat source side main expansion mechanism. The first refrigerant subflow channel is In the liquid flow path extending from the heat source side heat exchanger to the utilization side refrigerant flow path in the heat source side refrigerant main flow path, the branching occurs from a position on the utilization side refrigerant flow path side rather than from a position on the opposite side of the heat source side heat exchanger of the heat source side main expansion mechanism to which the second refrigerant subflow path is connected. A heat source unit for a refrigeration cycle device according to any one of claims 1 to 3. [Claim 6] A heat source unit (2) according to any one of claims 1 to 3, One or more of the utilization units (3a, 3b) connected to the heat source unit, A refrigeration cycle device (1) equipped with the following:

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