Refrigerant circuit assembly

Abstract

A refrigerant circuit assembly comprising an electric motor (40) and comprising: a first housing (10); a second housing (20) having a second space portion (21) for accommodating the motor and disposed in a first space portion (11c) of the first housing; a connection section (30) that holds the second housing in the first space section of the first housing so that the first inner wall surface of the first housing does not come into contact with the second outer wall surface of the second housing; a drive device (60) that is disposed on a first outer wall surface (11d) of the first housing and that drives the motor; and a connector (70) that is provided to the drive device, is connected to an outer wall surface (61) of the drive device, which is electrically connected to the first outer wall surface of the first housing, and has a shield section (71) that conducts electrical noise, the electrical noise generated by the motor flowing from the second housing to the outer wall surface of the drive device via the connection section and the first housing. And a first noise path (80) that reaches the shield of the connector.

Description

[0001] Cross-reference of related applications

[0002] This application is based on Japanese Patent Application No. 2023-45266, filed on March 22, 2023, the contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to a refrigerant loop assembly. Background Technology

[0004] Previously, for example, Patent Document 1 disclosed an electric motor for compressing refrigerant in an air conditioning system for vehicles. The stator of the motor is disposed in the space of the housing and is directly fixed to the inner wall of the housing.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent document 1: Japanese Patent Application Publication No. 2003-222078.

[0008] However, in the aforementioned prior art, since the housing is connected to the vehicle's body GND, electrical noise generated by the motor flows through the housing to the vehicle's body GND. Because the stator is directly fixed to the inner wall of the housing, the path of the electrical noise is formed over a wide area of ​​the housing.

[0009] Furthermore, electrical noise can flow into large conducted noise loops, such as those formed by the motor, the vehicle's ground plane (GND), the vehicle battery, and the wiring connecting the battery and motor. Therefore, there is a possibility of degraded EMC (Electromagnetic Compatibility) characteristics. To break the noise path of these conducted noise loops, insulation measures, such as those applied to the contact points between the housing and the stator, are necessary. Summary of the Invention

[0010] The purpose of this disclosure is to provide a refrigerant circuit assembly capable of suppressing the decline in EMC characteristics caused by large conducted noise cycles.

[0011] According to one aspect of this disclosure, a refrigerant circuit assembly includes an electric motor for compressing refrigerant and a first housing having a first space.

[0012] The refrigerant circuit assembly includes a second housing having a second space for accommodating the electric motor and disposed within a first space of the first housing.

[0013] The refrigerant circuit assembly includes a connection portion that is fixed to a first inner wall surface of a first housing and a second outer wall surface of a second housing, thereby holding the second housing in a first space portion of the first housing in such a way that the first inner wall surface of the first housing does not contact the second outer wall surface of the second housing.

[0014] The refrigerant circuit assembly includes a drive unit disposed on the first outer wall of the first housing, which drives an electric motor.

[0015] The refrigerant circuit assembly includes a connector disposed on the drive unit, connected to the outer wall of the drive unit which is electrically connected to the first outer wall of the first housing, and has a shielding portion for conducting electrical noise.

[0016] The electrical noise generated by the motor flows from the second housing through the connection and the first housing to the outer wall of the drive device, and then to the first noise path leading to the shield of the connector.

[0017] Therefore, even if the electrical noise generated in the motor flows to the entire second housing, it will also flow to the first housing via the connection, making it easier for it to flow to the GND of the drive unit or the shield of the connector, which is located near the connection. Thus, even if the first housing is connected to the vehicle's body GND, electrical noise is unlikely to flow to the body GND. Furthermore, since electrical noise can be conducted through a small conducted noise cycle between the connector and the device electrically connected to the connector, EMC characteristics can be improved. Therefore, the degradation of EMC characteristics caused by large conducted noise cycles flowing to the vehicle's body GND can be suppressed. Attached Figure Description

[0018] The above-mentioned and other objects, features, and advantages of this disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. These drawings are as follows:

[0019] Figure 1 This is a cross-sectional view of the refrigerant circuit assembly according to the first embodiment.

[0020] Figure 2 This is a partial cross-sectional view representing the first noise path.

[0021] Figure 3 This is a cross-sectional view of the refrigerant circuit assembly according to the second embodiment.

[0022] Figure 4 This is a cross-sectional view of the refrigerant circuit assembly according to the third embodiment.

[0023] Figure 5 This is a cross-sectional view of the refrigerant circuit assembly according to the fourth embodiment.

[0024] Figure 6This is a side view of the refrigerant circuit assembly according to the fifth embodiment.

[0025] Figure 7 This is a side view of the refrigerant circuit assembly according to the fifth embodiment. Detailed Implementation

[0026] Hereinafter, various methods for implementing this disclosure will be described with reference to the accompanying drawings. In each embodiment, there are cases where the same reference numerals are used to mark the parts corresponding to those described in prior embodiments, and repeated descriptions are omitted. Where only a part of the structure is described in each embodiment, the other previously described embodiments can be applied to the other parts of the structure. Not only can the parts that can be combined be specifically and explicitly indicated in each embodiment be combined with each other, but even if not explicitly indicated, embodiments can be partially combined with each other as long as there are no particular obstacles to combination.

[0027] (First Implementation)

[0028] Hereinafter, the first embodiment will be described with reference to the accompanying drawings. The refrigerant circuit assembly of this embodiment is, for example, applied to a vapor compression refrigeration cycle that regulates the temperature of the air blown into the vehicle interior by a vehicle air conditioning unit. The refrigerant circuit assembly compresses and discharges the refrigerant during the refrigeration cycle.

[0029] A refrigeration cycle includes: a condenser, which exchanges heat between the high-pressure refrigerant discharged from the refrigerant circuit assembly and the outside air, thereby dissipating heat from the high-pressure refrigerant; an expansion valve, which depressurizes the refrigerant after it has cooled down from the condenser; and an evaporator, which exchanges heat between the low-pressure refrigerant, depressurized by the expansion valve, and the supply air, thereby evaporating the low-pressure refrigerant. The refrigeration cycle is constructed by connecting the condenser, expansion valve, evaporator, and refrigerant circuit assembly in a loop via refrigerant piping.

[0030] In the refrigeration cycle, HFC-based refrigerants such as R134a are used as the refrigerant. This constitutes a subcritical refrigeration cycle where the high-pressure side refrigerant pressure does not exceed the refrigerant's critical pressure. Of course, HFO-based refrigerants such as R1234yf can also be used as the refrigerant. Furthermore, refrigeration oil (used for lubricating sliding parts within the refrigerant circuit components) is mixed into the refrigerant. A portion of the refrigeration oil circulates in the cycle along with the refrigerant.

[0031] Next, the structure of the refrigerant circuit assembly will be described. The refrigerant circuit assembly is, for example, located in the engine compartment of a vehicle. The refrigerant circuit assembly is configured as an electric compressor that operates by supplying electricity.

[0032] In this embodiment, such as Figure 1As shown, the refrigerant circuit assembly 1 includes a first housing 10, a second housing 20, a connecting part 30, a motor 40, a scroll compressor mechanism 50 (hereinafter referred to as the compressor mechanism 50), a drive device 60, and a connector 70.

[0033] Specifically, the refrigerant circuit assembly 1 is configured such that a second housing, a shaft 41, etc. are housed inside the first housing 10. The second housing 20 houses a motor 40 that drives the compression mechanism 50 to rotate, and the shaft 41 is a rotating shaft that transmits rotational driving force from the motor 40 to the compression mechanism 50.

[0034] Furthermore, in the refrigerant circuit assembly 1, the rotation axis of shaft 41 extends horizontally, and the compression mechanism 50 and the motor 40 are arranged in the horizontal direction. The refrigerant circuit assembly 1 is configured as a so-called horizontal type.

[0035] The first housing 10 constitutes the outer shell of the refrigerant circuit assembly 1. The first housing 10 has a sealed container structure formed by combining multiple metal parts. The first housing 10 is formed of a metallic material such as Al. The first housing 10 has a front housing 11, an intermediate housing 12, and a rear housing 13.

[0036] The front housing 11 is a bottomed cylindrical container. For example, the front housing 11 is a bottomed cylindrical container.

[0037] Furthermore, the front housing 11 is not limited to a bottomed cylindrical shape; any bottomed cylindrical shape is acceptable. Alternatively, the front housing 11 may not be a bottomed cylindrical shape. For example, the front housing 11 may be assembled with a bottom portion and a cylindrical portion separated by a seal or the like.

[0038] The front housing 11 has an electric motor side bearing 14. The electric motor side bearing 14 is axially fixed to the bottom portion 11a forming one side of the front housing 11 on the shaft 41. Furthermore, the front housing 11 is electrically connected to the vehicle body GND 100.

[0039] The intermediate housing 12 is formed in a generally circular plate shape and has a compression mechanism side bearing 12a disposed approximately at the center. The intermediate housing 12 is disposed inside the front housing 11. The outer peripheral side of the intermediate housing 12 is pressed into the first inner wall surface 11b of the front housing 11. Thus, the intermediate housing 12 divides the internal space of the front housing 11. That is, the first housing 10 has a first space portion 11c divided by the front housing 11 and the intermediate housing 12.

[0040] The rear housing 13 closes the opening side of the front housing 11. The rear housing 13 is fixed to the front housing 11 by screws 13a.

[0041] The front housing 11, the middle housing 12, and the rear housing 13 are integrated by means of press-fitting or bolt fastening with screws 13a. Furthermore, at the contact points where the front housing 11, the middle housing 12, and the rear housing 13 abut against each other, sealing components (not shown) consisting of O-rings, gaskets, etc., are provided. Therefore, refrigerant will not leak from any of the contact points.

[0042] A suction port (not shown) is formed on the bottom part 11a of the front housing 11 for drawing in low-pressure refrigerant from the outside of the first housing 10. The low-pressure refrigerant is the refrigerant flowing out of the evaporator of the refrigeration cycle. The suction port is connected to the first space 11c. Therefore, the low-pressure refrigerant drawn in from the suction port flows into the first space 11c.

[0043] A flat surface 11e extending in a generally horizontal direction is formed on the first outer wall surface 11d of the cylindrical portion of the front housing 11. A drive unit 60 that supplies electricity to the motor 40 is disposed on the flat surface 11e. Therefore, in the refrigerant circuit assembly 1, the motor 40 and the drive unit 60 can be cooled by the low-pressure refrigerant flowing into the first space portion 11c from the suction port.

[0044] Furthermore, the components constituting the first housing 10 are not limited to the aforementioned housings 11 to 13. For example, the first housing 10 may also be composed of four or more components.

[0045] The second housing 20 is a bottomed cylindrical component having a second space 21. The second housing 20 is, for example, a cup-shaped shell made of a metal material such as Fe, or an electromagnetic steel plate. The second housing 20 houses the motor 40 in the second space 21. The second housing 20 is disposed in the first space 11c of the first housing 10.

[0046] In this embodiment, no suction port is provided for the flow of low-pressure refrigerant from the first housing 10 to the second housing 20. Furthermore, the second housing 20 is in an unsealed state.

[0047] Alternatively, a suction port for drawing low-pressure refrigerant from the first space 11c of the first housing 10 may be formed in the second housing 20. In this case, the suction port of the second housing 20 is connected to the second space 21. Therefore, the low-pressure refrigerant drawn in from the suction port of the second housing 20 flows into the second space 21.

[0048] The connecting portion 30 holds the second housing 20 within the first space portion 11c of the first housing 10 in such a way that the first inner wall surface 11b of the front housing 11 of the first housing 10 does not contact the second outer wall surface 22 of the second housing 20. In this embodiment, the connecting portion 30 is composed of a protrusion 11f provided on the first housing 10 and a flange portion 23 provided on the second housing 20.

[0049] The protrusion 11f is a portion of the first inner wall surface 11b of the front housing 11 that protrudes toward the shaft 41. The protrusion 11f is formed in a ring shape along the circumference of the front housing 11. Alternatively, the protrusion 11f may be provided intermittently along the circumference of the front housing 11.

[0050] The flange portion 23 is formed such that it protrudes radially outward from the open end of the second housing 20. The flange portion 23 is formed such that it surrounds the second housing 20 circumferentially. Alternatively, the flange portion 23 may be provided intermittently along the circumferential direction of the second housing 20, similar to the protrusion 11f.

[0051] A through hole (not shown) is formed in the connecting part 30 for allowing low-pressure refrigerant to pass through. Therefore, the low-pressure refrigerant drawn into the first space 11c from the suction port of the front housing 11 flows into one side of the intermediate housing 12.

[0052] Furthermore, even if the protrusion 11f and flange 23 constituting the connecting portion 30 are formed intermittently, space for low-pressure refrigerant to pass through can be ensured even if a through hole is not provided in the connecting portion 30. In addition, the refrigerant can also circulate through the gap in the second housing 20, the air gap between the stator 42 and the rotor 43 (described later), etc.

[0053] The top surface 11g of the protrusion 11f contacts the second outer wall surface 22 of the second housing 20. Additionally, the flange 23 contacts the opening-side end surface 11h of the front housing 11 within the protrusion 11f. Furthermore, the protrusion 11f and the flange 23 are secured by screws 15. In this embodiment, the screws 15 extend from one side of the rear housing 13 through the intermediate housing 12 to the connecting portion 30, and secure the protrusion 11f and the flange 23.

[0054] Thus, the second housing 20 is fixed to the first housing 10 in such a way that the second outer wall surface 22 of the second housing 20 does not contact the first inner wall surface 11b of the first housing 10. That is, the second housing 20 is held in the first housing 10 via the connecting portion 30 in a state of floating above the first space portion 11c of the first housing 10.

[0055] Furthermore, the screw 15 only needs to be able to secure the protrusion 11f and the flange 23, and can be a short structure. Also, the method of securing the protrusion 11f and the flange 23 is not limited to the screw 15; other methods such as welding can also be used. Furthermore, the connecting part 30 only needs to be fixed to the first inner wall surface 11b of the first housing 10 and the second outer wall surface 22 of the second housing 20. Therefore, the connecting part 30 can be provided only in the first housing 10 or only in the second housing 20. Alternatively, the connecting part 30 can also be configured as a separate component separate from the first housing 10 and the second housing 20.

[0056] The electric motor 40 outputs a rotational driving force to drive the compression mechanism 50. The electric motor 40 is disposed on the inner circumferential side of the cylindrical portion in the second housing 20, namely the second space portion 21. The electric motor 40 has a stator 42 constituting a stator and a rotor 43 constituting a rotor.

[0057] The stator 42 is fixed to the second inner wall surface 24 of the second housing 20. The stator 42 is constructed by winding stator coils around a stator core made of magnetic material. Furthermore, when power is supplied to the stator coils from the drive device 60, a rotating magnetic field is generated that causes the rotor 43 to rotate.

[0058] The rotor 43 is constructed with permanent magnets. The rotor 43 is disposed on the inner circumference side of the stator 42. Furthermore, the rotor 43 is formed into a cylindrical shape extending along the rotation axis. The rotor 43 is fixed to the shaft 41 by pressing a portion of the metal shaft 41 into the central hole of the shaft.

[0059] The axial length of shaft 41 is longer than the axial length of rotor 43. One axial end of shaft 41 is rotatably supported by a motor-side bearing 14, which is disposed on the bottom portion 11a of the front housing 11. The other axial end of shaft 41, i.e., the compression mechanism 50 side, is rotatably supported by a compression mechanism-side bearing 12a, which is disposed in the intermediate housing 12. Therefore, when power is supplied to the stator coils of stator 42 to generate a rotating magnetic field, rotor 43 and shaft 41 become a single unit and rotate.

[0060] The compression mechanism 50 consists of a pair of scroll plates, each having a flat base plate portion and a spiral tooth portion protruding axially from the base plate portion toward the shaft 41. It has a movable scroll plate 51 and a fixed scroll plate 52 made of a metal material such as aluminum alloy.

[0061] The movable scroll plate 51 has a circular movable side base plate portion 51a and a scroll-shaped movable side tooth portion 51b protruding from the movable side base plate portion 51a toward the fixed scroll plate 52. The fixed scroll plate 52 has a circular fixed side base plate portion 52a and a scroll-shaped fixed side tooth portion 52b protruding from the fixed side base plate portion 52a toward the movable scroll plate 51.

[0062] Furthermore, the fixed scroll disk 52 is pressed into the first inner wall surface 11b of the front housing 11 by the outer peripheral side of the fixed side base plate portion 52a and thus fixed to the front housing 11. The movable scroll disk 51 is disposed in the space formed between the intermediate housing 12 and the fixed scroll disk 52.

[0063] The movable scroll plate 51 and the fixed scroll plate 52 are arranged such that the plate surfaces of their respective base plate portions 51a and 52a face each other. In addition, the movable scroll plate 51 and the fixed scroll plate 52 are configured such that their respective teeth 51b and 52b mesh with each other, and the top tip of the tooth of one scroll plate abuts against the base plate portion of the other scroll plate.

[0064] Thus, the individual teeth 51b and 52b contact each other at multiple points, forming multiple crescent-shaped working chambers 53 when viewed from the rotation axis direction of shaft 41. Furthermore, in Figure 1 In order to clarify the illustration, one of the multiple studios 53 is given a symbol, while the symbols for the other studios are omitted.

[0065] In addition, in this embodiment, the intermediate housing 12 is formed with an intake-side communication path (not shown) that connects the working chamber 53, which is displaced to the outermost peripheral side to become the largest volume, and the first space portion 11c.

[0066] A discharge port 54 is formed at the center of the fixed side base plate portion 52a of the fixed scroll plate 52 to discharge the refrigerant compressed by the working chamber 53. The discharge port 54 communicates with the discharge chamber 16, which allows the high-pressure refrigerant compressed by the working chamber 53 to flow in. A reed valve 17 is provided in the discharge chamber 16 to prevent the refrigerant from flowing back from the discharge chamber 16 side to the working chamber 53 side through the discharge port 54.

[0067] The discharge chamber 16 is formed by the space between the fixed scroll plate 52 and the rear housing 13. The discharge chamber 16 is provided with a structure for separating the refrigerant oil from the high-pressure refrigerant containing the refrigerant oil.

[0068] The refrigeration oil separated in the discharge chamber 16 is guided to the sliding portion of the compression mechanism 50 and the motor 40 via an oil passage (not shown) formed in the rear housing 13, the fixed scroll plate 52, and the intermediate housing 12. On the other hand, the high-pressure refrigerant separated in the discharge chamber 16 is guided to the discharge port 18 formed in the rear housing 13, which discharges the high-pressure refrigerant to the outside of the first housing 10.

[0069] The drive unit 60 is a device that controls the operation of the motor 40. The drive unit 60 has circuit components such as a switching circuit for converting the DC voltage of the high-voltage battery into AC voltage, a filter circuit for absorbing noise caused by the operation of the switching circuit, and a drive circuit for actuating each switching element 4 of the switching circuit.

[0070] The switching circuit generates three-phase AC voltages and currents (U-phase, V-phase, and W-phase) to drive a high-voltage motor 40. The filter circuit consists of components such as capacitors and resistors.

[0071] The drive circuit controls the current flowing to each phase of the motor 40 so that the motor 40 outputs a specified torque. In addition, the drive circuit performs the detection of voltage and current required to drive the motor 40, the output of switching signals, and various control calculations. Furthermore, the drive unit 60 also operates other functional components included in the refrigerant circuit assembly 1.

[0072] The drive unit 60 is configured such that the circuit board on which the aforementioned circuits are formed is housed in a metal casing. The casing is electrically connected to the GND of each circuit. Therefore, the GND of the drive unit 60 is electrically connected to the front housing 11. Furthermore, the metal casing constituting the drive unit 60 can also be housed in other metal casings or resin casings.

[0073] In addition, the drive unit 60 is electrically connected to the motor 40 inside the second housing 20 via a wiring (not shown) pulled out from one side of the bottom part 11a of the front housing 11 to the first space 11c.

[0074] The drive unit 60 is disposed on the flat surface 11e of the first outer wall surface 11d of the front housing 11 via an insulating sheet (not shown). Furthermore, the portion of the drive unit 60 within the first housing 10 where the connecting portion 30 is fixed is disposed at a position opposite to the connecting portion 30. In other words, the drive unit 60 is disposed at the position corresponding to the connecting portion 30 on the first outer wall surface 11d of the front housing 11. That is, the front housing 11 of the first housing 10 is located between the drive unit 60 and the connecting portion 30.

[0075] Furthermore, an insulating sheet is not necessarily required. The drive unit 60 may also be disposed on the flat surface 11e of the first outer wall surface 11d of the front housing 11 without the need for an insulating sheet. Alternatively, the outer wall surface 61 of the drive unit 60 and the first outer wall surface 11d of the front housing 11 may be integral. Or, the housing of the drive unit 60 and the front housing 11 may also be integral.

[0076] Connector 70 is a high-voltage connector for connecting a high-voltage wiring harness (not shown) to the power supply of the vehicle's high-voltage battery, driving power control unit, etc., and to the drive unit 60. The high-voltage wiring harness has a noise-resistant shielding structure. Connector 70 is provided in the drive unit 60 such that it protrudes from the side of the rear housing 13 side of the drive unit 60 towards the rear housing 13 side.

[0077] Like the high-voltage wiring harness, the connector 70 has an internal noise propagation shield 71. The shield 71 is configured as wiring for noise propagation. The shield 71 is electrically connected to the first outer wall surface 11d of the front housing 11 of the first housing 10. In addition, the shield 71 has a structure for propagating electrical noise, which includes a shielded wire connecting the high-voltage wiring harness to the refrigerant circuit assembly 1.

[0078] The shielding part 71 is electrically connected to the GND of the drive unit 60. The above is the overall structure of the refrigerant circuit assembly 1.

[0079] Next, the operation of the refrigerant circuit assembly 1 will be explained. When power is supplied to the motor 40 and the rotor 43 and shaft 41 rotate, the movable scroll plate 51 rotates relative to the fixed scroll plate 52, i.e., it revolves. As a result, the working chamber 53 of the compression mechanism 50 decreases in volume while displacing from the outer periphery to the center.

[0080] Here, the chamber 53, which is formed on the outermost periphery and has the largest volume, communicates with the first space 11c and the second space 21. Therefore, the low-pressure refrigerant flowing into the first space 11c and the second space 21 from the suction port of the front housing 11 is drawn into the chamber 53, which has the largest volume. At this time, the motor 40 is cooled by the low-pressure refrigerant flowing through the first space 11c and the second space 21, and the drive unit 60 is cooled by the wall of the front housing 11.

[0081] Furthermore, by causing the chamber 53 to decrease in volume while shifting from the outer periphery to the center, the refrigerant within the chamber 53 is compressed. Subsequently, as the chamber 53 shifts towards the center, when the refrigerant pressure within the chamber 53 exceeds the opening pressure of the reed valve 17, the reed valve 17 opens, and the high-pressure refrigerant within the chamber 53 flows into the discharge chamber 16 through the discharge port 54. The high-pressure refrigerant flowing out of the discharge chamber 16 separates from the refrigeration oil in the discharge chamber 16 and is sprayed out from the discharge port 18.

[0082] As described above, the refrigerant circuit assembly 1 is capable of drawing in, compressing, and discharging refrigerant during the refrigeration cycle.

[0083] In the above structure, when the motor 40 rotates, electrical noise is generated in the motor 40. As described above, the motor 40 is housed in the second housing 20, and the second housing 20 is electrically connected to the first housing 10 via the connecting portion 30. Thus, since the first housing 10, which is the outermost part of the refrigerant circuit assembly 1, and the second housing 20, which supports the motor 40, are separate, the path of the electrical noise generated by the motor 40 changes. That is, the electrical noise flows from the second housing 20 to the first housing 10 via the connecting portion 30.

[0084] In the first housing 10, the resistance is low near the connection portion 30, so electrical noise can easily flow through; conversely, the resistance is high far from the connection portion 30, so electrical noise is difficult to flow through. Furthermore, in this embodiment, the location of the connection portion 30 where the first housing 10 connects to the second housing 20 is the opening side of the front housing 11.

[0085] Furthermore, in this embodiment, a drive device 60 is provided at a position corresponding to the connection portion 30 that connects to the first housing 10 and the second housing 20, which circulates electrical noise on the vehicle side. In other words, the drive device 60 and the connector 70 are not located on the bottom portion 11a of the front housing 11 or the bottom of the rear housing 13 in the first housing.

[0086] Therefore, even if the first housing 10 is connected to the vehicle body GND 100, since the vehicle body GND 100 is connected to the bottom part 11a located further away from the connection part 30 than the GND of the drive unit 60, electrical noise is unlikely to flow to the vehicle body GND 100. Specifically, even if electrical noise flows through the entire second housing 20, such as Figure 2 As shown, noise also flows from the second housing 20 through the connecting portion 30 and the front housing 11 of the first housing 10 to the outer wall surface 61 of the drive device 60, and then to the first noise path 80 leading to the shielding portion 71 of the connector 70. In addition, there are cases where electrical noise flows to the shielding portion 71 via the GND of the drive device 60.

[0087] Electrical noise flowing to the outer wall surface 61 of the drive unit 60 via the first noise path 80 flows to the high-voltage battery side via the high-voltage wiring harness connected to the connector 70. That is, electrical noise can be conducted through a small conducted noise loop between the connector 70 and the high-voltage battery electrically connected to the connector 70. Here, the small conducted noise loop is a noise path in which electrical noise does not flow to the vehicle body GND100.

[0088] Therefore, compared to the situation where electrical noise flows through a large conducted noise cycle consisting of the motor 40, the vehicle body GND100, the high-voltage battery, and the wiring connecting the high-voltage battery and the motor 40, EMC characteristics can be improved. That is, the decline in EMC characteristics in the refrigerant circuit assembly 1 can be suppressed.

[0089] Furthermore, since the electrical noise flowing in a large conducted noise cycle is reduced, the attenuation characteristics of the electrical filter used to attenuate electrical noise can be reduced in the drive device 60. Therefore, the electrical filter of the drive device 60 can be miniaturized.

[0090] In this embodiment, since the GND of the drive unit 60 is located near the connection portion 30, the distance from the first housing 10 to the drive unit 60 is shorter than the distance to the vehicle body GND 100. Therefore, electrical noise can be easily directed to the GND of the drive unit 60.

[0091] (Second Implementation)

[0092] In this embodiment, the differences from the first embodiment will be mainly described. For example... Figure 3As shown, the portion of the connector 70 in the first housing 10 where the connecting portion 30 is fixed is positioned opposite to the connecting portion 30. In other words, the connector 70 is positioned corresponding to the connecting portion 30 in the first outer wall surface 11d of the front housing 11.

[0093] Thus, electrical noise flows from the second housing 20 through the connecting portion 30 and the front housing 11 of the first housing 10 to the first noise path 80 reaching the shielding portion 71 of the connector 70. Therefore, since the distance from the first housing 10 to the connector 70 is shortened, electrical noise can be easily directed to the shielding portion 71 of the connector 70.

[0094] (Third Implementation)

[0095] This embodiment mainly describes the parts that differ from the first and second embodiments. In this embodiment, as... Figure 4 As shown, the first housing 10 has a resistance increasing portion 11i. The resistance increasing portion 11i is a portion located between one side of the front housing 11 and the other side opposite to that side.

[0096] The resistance-increasing portion 11i is configured as a groove portion 11j that is thinner than the thickness of one side portion and the thickness of the other side portion of the front housing 11 of the first housing 10. The groove portion 11j is a portion that becomes thinner circumferentially by forming a groove on the first outer wall surface 11d of the front housing 11. Furthermore, it is acceptable as long as the thickness of one side portion and the other side portion of the front housing 11 is relatively thicker than the groove portion 11j.

[0097] The radial cross-sectional area of ​​the resistance-increasing portion 11i is smaller than that of one side and the other side of the front housing 11. Therefore, the resistance of the resistance-increasing portion 11i is larger than that of one side and the other side of the front housing 11.

[0098] One side is a bottomed cylindrical portion on the bottom surface 11a side of the front housing 11. One side of the front housing 11 is electrically connected to the vehicle body GND100.

[0099] The other side is the cylindrical portion on the opening side of the front housing 11. The connecting part 30 is fixed to the position on the first inner wall surface 11b of the first housing 10 corresponding to the other side.

[0100] In this embodiment, the GND of the drive device 60 is disposed in the first outer wall surface 11d of the first housing 10 at a position corresponding to the opposite side, further away from the resistance increase portion 11i. Furthermore, as in the second embodiment, the shielding portion 71 of the connector 70 may also be disposed in the first outer wall surface 11d of the first housing 10 at a position corresponding to the opposite side, further away from the resistance increase portion 11i.

[0101] According to the above structure, in the front housing 11 of the first housing 10, the resistance of the resistance-increasing portion 11i is greater than that of the portion on the other side, so electrical noise is difficult to flow from the other side to one side. Therefore, it is possible to easily make the electrical noise flow to the other side of the GND in the front housing 11 where the drive unit 60 is disposed, rather than to the side of the front housing 11 where the vehicle body GND 100 is connected.

[0102] In addition, a portion of the front housing 11 is made thinner along the circumferential direction. Therefore, it is possible to provide a high-resistance portion of the front housing 11 without dividing the front housing 11 into two.

[0103] (Fourth Implementation)

[0104] This embodiment mainly describes the parts that differ from the third embodiment. In this embodiment, as... Figure 5 As shown, the front housing 11 of the first housing 10 is separated into a third housing 11k corresponding to one side and a fourth housing 11m corresponding to the other side.

[0105] Additionally, as the resistance-increasing part 11i, the metal gasket seal 11n is held and fixed by the third housing 11k and the fourth housing 11m. Although not shown, the third housing 11k and the fourth housing 11m are fixed, for example, by screws or the like.

[0106] According to the above structure, the gasket seal 11n, which serves as the resistance-increasing part 11i, can have completely different physical properties from the first housing 10. Therefore, the gasket seal 11n makes it difficult for electrical noise to flow from the side of the fourth housing 11m to the side of the third housing 11k.

[0107] Furthermore, the front housing 11 of the first housing 10 is not limited to being divided into two parts, but can also be separated into three or more parts. In this case, the same gasket seal 11n can be arranged between the divided housings, or objects with different physical properties can be arranged separately.

[0108] (Fifth Implementation)

[0109] This embodiment mainly describes the parts that differ from the embodiments described above. For example... Figure 6 As shown, the first housing 10 includes a functional component 90 disposed on a first outer wall surface 11d of the front housing 11. The functional component 90 is, for example, an electronic component used under low voltage.

[0110] exist Figure 6In the example shown, the bottom surface 11p of the bottom part 11a in one side of the front housing 11 of the vehicle body GND100 is electrically connected to one side of the drive unit 60. As a result, electrical noise flows from the position of the first outer wall surface 11d in one side of the front housing 11 corresponding to the connection part 30 along the axial direction of the shaft 41 to the second noise path 81 reaching the vehicle body GND100 with the shortest distance.

[0111] Therefore, as the location of the second noise path 81 in the first outer wall surface 11d of the front housing 11, the functional component 90 is disposed in the first outer wall surface 11d on the opposite side from the drive device 60. That is, the functional component 90 is disposed in a location where electrical noise is difficult to flow.

[0112] This reduces the impact of electrical noise from the high-voltage side on the low-voltage functional component 90. In other words, it reduces the EMC impact on the low-voltage functional component 90.

[0113] Or, in Figure 7 In the example shown, the vehicle body GND100 is electrically connected to one side of the drive unit 60 at the bottom surface 13b of the rear housing 13. Thus, the second noise path 81 becomes the path from the position of the first outer wall surface 11d corresponding to the connection portion 30 on one side of the front housing 11 along the axial direction of the shaft 41 to the bottom surface 13b of the rear housing 13 with the shortest distance.

[0114] Therefore, the functional component 90 is disposed on one side of the bottom surface 11p in the first outer wall surface 11d of the front housing 11. Furthermore, relative to... Figure 7 The second noise path 81 shown can also be represented by functional component 90. Figure 6 The configuration is as follows. Functional component 90 only needs to be configured away from the second noise path 81. Figure 6 and Figure 7 The position of the functional component 90 shown is one example; it can be any other position as long as it is far away from the second noise path 81.

[0115] This disclosure is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of this disclosure.

[0116] For example, the refrigerant circuit assembly 1 is not limited to applications in the refrigeration cycle of vehicle air conditioning systems. The refrigerant circuit assembly 1, as a compressor for compressing various fluids, can be applied to a wide range of uses.

[0117] In the above embodiments, an insulating element for preventing electrical noise from flowing from one side of the front housing 11 to the other can also be provided inside the drive device 60.

[0118] The connecting portion 30 is not limited to being located on the opening side of the front housing 11 of the first housing 10. For example, the connecting portion 30 may also be located on one side of the bottom portion 11a in the front housing 11. In this case, the connector 70 is also disposed on one side of the bottom portion 11a in the first outer wall surface 11d of the front housing 11. In addition, the vehicle body GND 100 is connected to the rear housing 13.

[0119] Although this disclosure is described based on embodiments, it is not limited to those embodiments or constructions. This disclosure also includes various modifications and equivalent variations. Furthermore, various combinations and methods, as well as other combinations and methods including only one element, or more than one element or fewer than one element, are also within the scope and spirit of this disclosure.

[0120] The technical features of the refrigerant circuit assembly disclosed in this specification are as follows.

[0121] (Project 1)

[0122] A refrigerant circuit assembly includes an electric motor (40) for compressing refrigerant, and further includes:

[0123] A first housing (10) having a first space (11c);

[0124] A second housing (20) having a second space (21) for accommodating the electric motor and disposed in the first space of the first housing;

[0125] A connecting part (30) is fixed to the first inner wall surface (11b) of the first housing and the second outer wall surface (22) of the second housing, so as to keep the second housing in the first space of the first housing in such a way that the first inner wall surface of the first housing does not contact the second outer wall surface of the second housing;

[0126] A drive unit (60) disposed on the first outer wall surface (11d) of the first housing, drives the electric motor; and

[0127] A connector (70) is disposed on the drive device, connected to the outer wall surface (61) of the drive device which is electrically connected to the first outer wall surface of the first housing, and having a shielding portion (71) for conducting electrical noise.

[0128] The electrical noise generated by the motor flows from the second housing through the connection and the first housing to the outer wall of the drive device, and then to the first noise path (80) leading to the shield of the connector.

[0129] (Project 2)

[0130] According to the refrigerant loop assembly described in Project 1

[0131] The drive device is disposed on the first outer wall surface of the first housing at a position corresponding to the connecting portion.

[0132] (Project 3)

[0133] According to the refrigerant loop assembly described in Project 1

[0134] The connector is disposed at a position on the first outer wall surface of the first housing corresponding to the connecting portion.

[0135] (Project 4)

[0136] The refrigerant circuit assembly according to any one of items 1 to 3

[0137] The first housing has a resistance-increasing portion (11i) between one side and the opposite side of the first side, the resistance of which is higher than the resistance of the first side and the opposite side.

[0138] One side of the first housing is electrically connected to the vehicle body GND (100).

[0139] The connecting part is fixed to the position on the first inner wall surface of the first housing corresponding to the other side.

[0140] The GND of the drive device and the shield of the connector are disposed in the first outer wall surface of the first housing at a position closer to the other side than the resistance-increasing portion.

[0141] (Project 5)

[0142] According to the refrigerant loop assembly described in Project 4

[0143] The resistance-increasing portion is a portion of the first housing that is thinner than the thickness of the portion on one side and the thickness of the portion on the other side.

[0144] (Project 6)

[0145] According to the refrigerant loop assembly described in Project 4

[0146] The first housing is divided into a third housing (11k) on one side and a fourth housing (11m) on the other side.

[0147] The resistance-increasing part is held and fixed by the third housing and the fourth housing.

[0148] (Project 7)

[0149] The refrigerant loop assembly according to any one of items 1 to 6,

[0150] Includes a functional component (90) disposed on the first outer wall surface of the first housing.

[0151] The first housing is electrically connected to the vehicle body via GND (100).

[0152] The functional component is positioned away from the second noise path (81), which is the path through which the electrical noise flows from the first housing to the vehicle body GND.

Claims

1. A refrigerant circuit assembly comprising an electric motor (40) for compressing refrigerant, characterized in that, Include: A first housing (10) having a first space (11c); A second housing (20) having a second space (21) for accommodating the electric motor and disposed in the first space of the first housing; A connecting part (30) is fixed to the first inner wall surface (11b) of the first housing and the second outer wall surface (22) of the second housing, so as to keep the second housing in the first space of the first housing in such a way that the first inner wall surface of the first housing does not contact the second outer wall surface of the second housing; A drive unit (60) is disposed on the first outer wall surface (11d) of the first housing and drives the electric motor; as well as A connector (70) is disposed on the drive device, connected to the outer wall surface (61) of the drive device which is electrically connected to the first outer wall surface of the first housing, and having a shielding portion (71) for conducting electrical noise. The electrical noise generated by the motor flows from the second housing through the connection and the first housing to the outer wall of the drive device, and then to the first noise path (80) leading to the shield of the connector.

2. The refrigerant circuit assembly according to claim 1, characterized in that, The drive device is disposed on the first outer wall surface of the first housing at a position corresponding to the connecting portion.

3. The refrigerant circuit assembly according to claim 1, characterized in that, The connector is disposed at a position on the first outer wall surface of the first housing corresponding to the connecting portion.

4. The refrigerant circuit assembly according to any one of claims 1 to 3, characterized in that, The first housing has a resistance-increasing portion (11i) between one side and the opposite side of the first side, the resistance of which is higher than the resistance of the first side and the opposite side. One side of the first housing is electrically connected to the vehicle body GND (100). The connecting part is fixed to the position on the first inner wall surface of the first housing corresponding to the other side. The GND of the drive device and the shield of the connector are disposed in the first outer wall surface of the first housing at a position closer to the other side than the resistance-increasing portion.

5. The refrigerant circuit assembly according to claim 4, characterized in that, The resistance-increasing portion is a portion of the first housing that is thinner than the thickness of the portion on one side and the thickness of the portion on the other side.

6. The refrigerant circuit assembly according to claim 4, characterized in that, The first housing is divided into a third housing (11k) on one side and a fourth housing (11m) on the other side. The resistance-increasing part is held and fixed by the third housing and the fourth housing.

7. The refrigerant circuit assembly according to any one of claims 1 to 3, characterized in that, Includes a functional component (90) disposed on the first outer wall surface of the first housing. The first housing is electrically connected to the vehicle body via GND (100). The functional component is positioned away from the second noise path (81), which is the path through which the electrical noise flows from the first housing to the vehicle body GND.

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