Electric compressor

Abstract

The switching element (70) has a conductive member (71) and a rectangular parallelepiped-shaped resin member (72). The resin member (72) has: a first end surface (72a) which is an end surface in the longitudinal direction and from which a part of the conductive member (71) protrudes; a second end surface (72b) which is an end surface on the opposite side from the first end surface (72a); and a first side surface (72c) connecting the first end surface (72a) and the second end surface (72b). The conductive member (71) has a heat generating part (73a) exposed on the first side surface (72c). The switching element (70) is disposed in the inverter housing chamber (S1) such that the longitudinal direction of the resin member (72) extends in the axial direction of the rotating shaft. A metal heat dissipation member (80) is disposed between the switching element (70) and the partition wall (22). The heat dissipation member (80) has a first heat dissipation part (81) disposed between the heat generation part (73a) and the partition wall (22), and a second heat dissipation part (82) continuous with the first heat dissipation part (81) and disposed between the second end surface (72b) and the partition wall (22).

Description

Technical Field

[0001] The present invention relates to an electric compressor. Background Art

[0002] The electric compressor includes a rotating shaft, an electric motor that rotates the rotating shaft, a compression unit that compresses a fluid by rotating the rotating shaft, an inverter that drives the electric motor, and a housing. The inverter has a switching element. The housing has a partition wall that separates a suction chamber that accommodates the electric motor and sucks in the fluid and an inverter housing chamber that accommodates the inverter.

[0003] In the electric compressor disclosed in Patent Document 1, the switching element is pressed against the partition wall by a pressing fixture, so that the switching element is cooled by the fluid sucked into the suction chamber via the partition wall.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2015-81539 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In such an electric compressor, improvement in cooling performance of the switching element is desired.

[0009] Means for solving problems

[0010] According to one embodiment of the present invention, there is provided an electric compressor, which includes: a rotating shaft; an electric motor that rotates the rotating shaft; a compression part that compresses a fluid by rotating the rotating shaft; a converter that drives the electric motor and has a switching element; and a metal housing, the housing having a partition wall that separates a suction chamber that accommodates the electric motor and sucks the fluid from a converter housing chamber that accommodates the converter. The switching element includes: a conductive member that includes a main part and a pin protruding from the main part; and a rectangular parallelepiped resin member that accommodates the main part. The resin member includes: a first end face that is an end face in the long side direction and from which the pin protrudes; a second end face that is an end face on the opposite side of the first end face in the long side direction; and a side face that connects the first end face to the second end face. The main part includes a heat generating part that is exposed to the outside of the resin member at the side face. The switching element is arranged in the converter housing chamber in such a manner that the long side direction of the resin member extends along the axial direction of the rotating shaft. A metal heat dissipation member is disposed between the switch element and the partition wall. The heat dissipation member includes a first heat dissipation portion disposed between the heat generating portion and the partition wall, and a second heat dissipation portion that is continuous with the first heat dissipation portion and disposed between the second end surface and the partition wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a side sectional view of the electric compressor.

[0012] Figure 2 In the figure, (a) is a plan view of the converter, and (b) is a partial enlarged view of (a).

[0013] Figure 3 yes Figure 2 (b) is the 3-3 line section view.

[0014] Figure 4 yes Figure 2 (b) is the 4-4 line cross-sectional view.

[0015] Figure 5 It is a three-dimensional cross-sectional view of a switching module. DETAILED DESCRIPTION

[0016] Below, according to Figure 1 to Figure 5 An embodiment in which an electric compressor is embodied will be described. The electric compressor of this embodiment is used in, for example, a vehicle air conditioner.

[0017] like Figure 1As shown, the electric compressor 10 includes a housing 11, a shaft support member 12, a rotating shaft 13, an electric motor 14, a compression unit 15, and an inverter 16. The housing 11 is made of metal. The housing 11 of this embodiment is made of aluminum. The housing 11 accommodates the shaft support member 12, the rotating shaft 13, the electric motor 14, the compression unit 15, and the inverter 16. The electric motor 14 rotates the rotating shaft 13. The compression unit 15 compresses the refrigerant as a fluid by the rotation of the rotating shaft 13. The inverter 16 drives the electric motor 14.

[0018] <Housing>

[0019] The housing 11 includes a first housing component 11 a , a second housing component 11 b , and a cover 11 c .

[0020] The first shell component 11a has a cylindrical peripheral wall 21 and a partition wall 22. The peripheral wall 21 has a first end 21a and a second end 21b. The first end 21a and the second end 21b are axial ends of the peripheral wall 21. The second end 21b is located at a position opposite to the first end 21a in the axial direction of the peripheral wall 21. The partition wall 22 partitions the space inside the peripheral wall 21 in the axial direction. The partition wall 22 has a first wall surface 22a and a second wall surface 22b. The first wall surface 22a and the second wall surface 22b are surfaces that are substantially perpendicular to the axial direction of the peripheral wall 21. The second wall surface 22b is located on the opposite side of the first wall surface 22a in the axial direction of the peripheral wall 21.

[0021] The partition wall 22 has a boss 23. The boss 23 protrudes from the second wall surface 22b of the partition wall 22. The boss 23 has a bearing accommodation portion 23a that is recessed from the top end surface of the boss 23. The bearing accommodation portion 23a accommodates the first bearing 17.

[0022] like Figure 2 As shown in (a), the partition wall 22 has a receiving recess 24. The partition wall 22 of this embodiment has three receiving recesses 24. The three receiving recesses 24 are arranged in a V shape.

[0023] like Figure 3 and Figure 4 As shown, the receiving recess 24 is recessed from the first wall surface 22a and protrudes from the second wall surface 22b. The receiving recess 24 has an inner bottom surface 24a and an inner side surface connecting the inner bottom surface 24a and the first wall surface 22a. The inner bottom surface 24a is located on the opposite side of the first wall surface 22a across the second wall surface 22b.

[0024] like Figure 2 (a) and Figure 2As shown in (b), when viewed from the axial direction of the peripheral wall 21, the receiving recess 24 is in a rectangular shape. The inner side surface of the receiving recess 24 includes a first inner side surface 24b, a second inner side surface 24c, a third inner side surface 24d, and a fourth inner side surface 24e. The first inner side surface 24b and the second inner side surface 24c extend along the long side direction of the receiving recess 24. The third inner side surface 24d and the fourth inner side surface 24e extend along the short side direction of the receiving recess 24.

[0025] like Figure 1 As shown, the second case structure 11b is connected to the first end 21a of the peripheral wall 21. The second case structure 11b closes the opening at the first end 21a of the peripheral wall 21.

[0026] The cover 11c is connected to the second end 21b of the peripheral wall 21. The cover 11c closes the opening at the second end 21b of the peripheral wall 21. The converter housing chamber S1 is partitioned by the inner peripheral surface of the peripheral wall 21, the first wall surface 22a of the partition wall 22, and the inner surface of the cover 11c. The converter housing chamber S1 accommodates the converter 16. The first wall surface 22a of the partition wall 22 is exposed in the converter housing chamber S1.

[0027] The shell 11 has an inlet 111 and an outlet 112. The inlet 111 is provided in the peripheral wall 21. The inlet 111 is located between the first end 21a of the peripheral wall 21 and the partition wall 22. The outlet 112 is provided in the second shell component 11b. One end of an external refrigerant circuit (not shown) is connected to the inlet 111, and the other end of the external refrigerant circuit is connected to the outlet 112.

[0028] <Shaft Supporting Member>

[0029] The shaft support member 12 is accommodated in the peripheral wall 21. The shaft support member 12 is located between the first end portion 21a of the peripheral wall 21 and the partition wall 22. The shaft support member 12 has a shaft insertion hole 12a and a communication hole 12b. The second bearing 18 is accommodated in the shaft insertion hole 12a.

[0030] The suction chamber S2 is demarcated by the inner circumferential surface of the peripheral wall 21, the second wall surface 22b of the partition wall 22, and the shaft support member 12. The electric motor 14 is accommodated in the suction chamber S2. In other words, the suction chamber S2 is also a motor accommodation chamber that accommodates the electric motor 14. The suction chamber S2 and the converter accommodation chamber S1 are arranged in the axial direction of the peripheral wall 21. The partition wall 22 separates the converter accommodation chamber S1 and the suction chamber S2. The second wall surface 22b of the partition wall 22 and the surfaces of the wall portion that partitions the accommodation recess 24, which are located on the opposite side of the inner bottom surface 24a, the inner side surface 24b, 24c, 24d, and 24e, are exposed in the suction chamber S2.

[0031] <Rotation axis>

[0032] The rotating shaft 13 is accommodated in the peripheral wall 21. The rotating shaft 13 extends along the axial direction of the peripheral wall 21. That is, the axial direction of the rotating shaft 13 coincides with the axial direction of the peripheral wall 21. The first end of the rotating shaft 13 is inserted into the bearing accommodation portion 23a. The first end of the rotating shaft 13 is rotatably supported by the boss 23 via the first bearing 17. The second end, which is the end on the opposite side to the first end of the rotating shaft 13, is inserted into the shaft insertion hole 12a of the shaft support member 12. The second end of the rotating shaft 13 is rotatably supported by the shaft support member 12 via the second bearing 18.

[0033] <Electric Motor>

[0034] The electric motor 14 has a rotor 41 and a stator 42. The rotor 41 has a cylindrical rotor core 41a and a plurality of permanent magnets 41b. The rotor core 41a is fixed to the rotating shaft 13. A plurality of permanent magnets 41b are buried in the rotor core 41a. The permanent magnets 41b are arranged at equal intervals in the circumferential direction of the rotor core 41a. The stator 42 surrounds the rotor 41. The stator 42 has a cylindrical stator core 42a and a three-phase motor coil 42b. The stator core 42a is fixed to the inner circumferential surface of the peripheral wall 21. The motor coil 42b is wound around the stator core 42a. The rotor 41 rotates by causing current to flow in the motor coil 42b. The rotating shaft 13 rotates integrally with the rotor 41.

[0035] <Compression section>

[0036] The compression part 15 is accommodated in the peripheral wall 21. The compression part 15 is located on the opposite side of the electric motor 14 in the axial direction of the rotating shaft 13 across the shaft support member 12. The compression part 15 of this embodiment is a scroll type. The compression part 15 has a fixed scroll 51 and a movable scroll 52. The fixed scroll 51 is fixed to the inner peripheral surface of the peripheral wall 21. The movable scroll 52 is configured to face the fixed scroll 51.

[0037] A compression chamber S3 whose volume can be changed is defined between the fixed scroll 51 and the movable scroll 52. The compression chamber S3 communicates with the suction chamber S2 via the communication hole 12b of the shaft support member 12. A discharge chamber S4 is defined by the fixed scroll 51 and the inner surface of the second housing component 11b. The compression chamber S3 communicates with the discharge chamber S4.

[0038] The refrigerant is sucked into the suction chamber S2 from the suction port 111. The refrigerant sucked into the suction chamber S2 flows into the compression chamber S3 through the connecting hole 12b. The refrigerant flowing into the compression chamber S3 is compressed by the change in the volume of the compression chamber S3. The compressed refrigerant is discharged into the discharge chamber S4. The refrigerant discharged into the discharge chamber S4 flows out from the discharge port 112 to the external refrigerant circuit. The refrigerant flowing out to the external refrigerant circuit passes through the heat exchanger and the expansion valve of the external refrigerant circuit, and flows back into the suction chamber S2 from the suction port 111. The electric compressor 10 and the external refrigerant circuit constitute a vehicle air conditioning device.

[0039] <Converter>

[0040] like Figure 2 (a) and Figure 2 As shown in (b), the converter 16 has six switch modules 61, a coil 62, a capacitor 63 and a circuit board 64. The three-phase switch module 61 will be described later. The capacitor 63 and the coil 62 constitute an LC circuit. The LC circuit is a filter circuit for reducing noise contained in the input current from the outside. The six switch modules 61, the coil 62 and the capacitor 63 are mounted on the circuit board 64.

[0041] The six switch modules 61, coil 62, capacitor 63 and circuit board 64 are arranged on partition wall 22. That is, the inverter 16 is entirely arranged on partition wall 22. The six switch modules 61, coil 62 and capacitor 63 are arranged between partition wall 22 and circuit board 64 in the axial direction of rotating shaft 13.

[0042] The airtight terminal 65 is arranged on the partition wall 22. The airtight terminal 65 is inserted into the through hole 22h that penetrates the partition wall 22. The airtight terminal 65 has a three-phase connection terminal 65a and a terminal insulating portion 65b. One end of the connection terminal 65a is connected to the circuit substrate 64, and the other end of the connection terminal 65a is connected to the motor coil 42b of the same phase. The connection terminal 65a connects the inverter 16 and the electric motor 14. The terminal insulating portion 65b insulates each connection terminal 65a from the partition wall 22.

[0043] <Switch module>

[0044] like Figure 5As shown, the switch module 61 has a switch element 70, a heat dissipation component 80 and an insulating component 90. The switch element 70 of the present embodiment is an IGBT. The six switch elements 70 perform switching actions to drive the electric motor 14. The six switch elements 70 respectively constitute the upper arm of the U phase, the lower arm of the U phase, the upper arm of the V phase, the lower arm of the V phase, the upper arm of the W phase and the lower arm of the W phase. The heat dissipation component 80 is made of metal. The heat dissipation component 80 of the present embodiment is made of aluminum. The insulating component 90 is formed of an insulating material. The insulating component 90 of the present embodiment is made of rubber.

[0045] The switch element 70 includes a conductive member 71 and a rectangular parallelepiped resin member 72. The conductive member 71 includes a plate-shaped main portion 73 and three pins 74 extending from the main portion 73. The resin member 72 accommodates the main portion 73.

[0046] The resin member 72 has a first end face 72a and a second end face 72b. The first end face 72a and the second end face 72b are end faces in the long-side direction of the resin member 72. The second end face 72b is located at a position opposite to the first end face 72a in the long-side direction of the resin member 72. The three pins 74 of the conductive member 71 protrude from the first end face 72a of the resin member 72.

[0047] The resin member 72 has a side surface that connects the first end surface 72a and the second end surface 72b in the long side direction. The side surface has a first side surface 72c, a second side surface 72d, and a pair of third side surfaces 72e. The first side surface 72c and the second side surface 72d are connected to the long side of the first end surface 72a and the long side of the second end surface 72b. Each third side surface 72e is connected to the short side of the first end surface 72a and the short side of the second end surface 72b. The areas of the first side surface 72c and the second side surface 72d are respectively larger than the area of ​​the third side surface 72e.

[0048] like Figure 3 As shown, the resin member 72 has window portions 72g at a corner portion connecting the second side surface 72d and one third side surface 72e and a corner portion connecting the second side surface 72d and the other third side surface 72e, respectively.

[0049] like Figure 5 As shown in FIG. 1 , the main portion 73 has a heat generating portion 73a. The heat generating portion 73a is the portion that is most likely to generate heat in the main portion 73. The heat generating portion 73a is exposed to the outside of the resin member 72 at the first side surface 72c.

[0050] like Figure 3 As shown, the main portion 73 has an exposed portion 73b exposed to the outside of the resin member 72 through the window portion 72g. The exposed portion 73b is exposed to the outside of the resin member 72 at the second side surface 72d and the pair of third side surfaces 72e.

[0051] like Figure 3and Figure 4 As shown, the heat dissipation member 80 includes a first heat dissipation portion 81, a second heat dissipation portion 82, and a pair of third heat dissipation portions 83. The first heat dissipation portion 81 is rectangular. The second heat dissipation portion 82 is erected from one of the short sides of the first heat dissipation portion 81 along the plate thickness direction of the first heat dissipation portion 81. The second heat dissipation portion 82 is continuous with the first heat dissipation portion 81. A pair of third heat dissipation portions 83 is erected from a pair of long sides of the first heat dissipation portion 81 along the plate thickness direction of the first heat dissipation portion 81. The pair of third heat dissipation portions 83 is continuous with the first heat dissipation portion 81. In addition, the pair of third heat dissipation portions 83 are connected by the second heat dissipation portion 82 in the short side direction of the first heat dissipation portion 81. The pair of third heat dissipation portions 83 is continuous with the second heat dissipation portion 82.

[0052] The switch element 70 is arranged in a space surrounded by the first heat dissipation portion 81, the second heat dissipation portion 82, and a pair of third heat dissipation portions 83. The second end surface 72b of the resin member 72 is opposite to the second heat dissipation portion 82. The first side surface 72c and the heat generating portion 73a of the resin member 72 are opposite to the first heat dissipation portion 81. In the present embodiment, a heat sink 91 is arranged between the first side surface 72c and the heat generating portion 73a and the first heat dissipation portion 81. One surface of the heat sink 91 abuts against the first side surface 72c and the heat generating portion 73a, and the other surface of the heat sink 91 abuts against the first heat dissipation portion 81. The pair of third side surfaces 72e of the resin member 72 are opposite to the pair of third heat dissipation portions 83.

[0053] In the present embodiment, the insulating member 90 is insert-molded in a state where the switching element 70 is arranged on the heat dissipation member 80 . Thus, the switching element 70 and the heat dissipation member 80 are integrated via the insulating member 90 .

[0054] The insulating member 90 is interposed between the second end face 72b of the resin member 72 and the second heat dissipation portion 82, and between the pair of third side faces 72e of the resin member 72 and the pair of third heat dissipation portions 83. In addition, the insulating member 90 covers the first end face 72a and the second side face 72d of the resin member 72. In other words, the insulating member 90 covers the five faces of the resin member 72 except the first side face 72c. Therefore, the exposed portion 73b is covered by the insulating member 90.

[0055] like Figure 2 As shown in (a), the six switch modules 61 are housed in the converter housing chamber S1 in such a manner that the long side direction of the resin member 72 extends along the axial direction of the rotating shaft 13. Each pin 74 of the switch element 70 is connected to the circuit substrate 64. The six switch modules 61 are housed in the housing recess 24. In this embodiment, the switch modules 61 of the same phase are housed in one housing recess 24. Hereinafter, one of the switch modules 61 of the same phase is set as the first switch module 61a, and the other switch module 61 is set as the second switch module 61b.

[0056] like Figure 2 (b) and Figure 4 As shown, the first switch module 61 a and the second switch module 61 b ​​are arranged so that the second side surface 72 d of the resin member 72 faces each other with the insulating member 90 interposed therebetween.

[0057] The first heat dissipation portion 81 of the first switch module 61a faces the first inner side surface 24b of the receiving recess 24 via the heat dissipation grease 92. The second heat dissipation portion 82 of the first switch module 61a faces the inner bottom surface 24a of the receiving recess 24 via the heat dissipation grease 92. One of the pair of third heat dissipation portions 83 of the first switch module 61a faces the third inner side surface 24d of the receiving recess 24 via the heat dissipation grease 92, and the other third heat dissipation portion 83 faces the fourth inner side surface 24e of the receiving recess 24 via the heat dissipation grease 92.

[0058] The first heat dissipation portion 81 of the second switch module 61b faces the second inner side surface 24c of the receiving recess 24 via the heat dissipation grease 92. The second heat dissipation portion 82 of the second switch module 61b faces the inner bottom surface 24a of the receiving recess 24 via the heat dissipation grease 92. One of the pair of third heat dissipation portions 83 of the second switch module 61b faces the third inner side surface 24d of the receiving recess 24 via the heat dissipation grease 92, and the other third heat dissipation portion 83 faces the fourth inner side surface 24e of the receiving recess 24 via the heat dissipation grease 92.

[0059] That is, in each switch module 61, the first heat dissipation portion 81 is disposed between the heat generating portion 73a of the switch element 70 and the partition wall 22. The second heat dissipation portion 82 is disposed between the second end surface 72b of the switch element 70 and the partition wall 22. The pair of third heat dissipation portions 83 is disposed between the pair of third side surfaces 72e of the switch element 70 and the partition wall 22.

[0060] [Function of this embodiment]

[0061] The operation of this embodiment will be described.

[0062] The conductive member 71 of the switching element 70 generates heat when the inverter 16 operates. The heat of the switching element 70 is transferred to the first heat dissipation portion 81 via the heat sink 91. The heat transferred to the first heat dissipation portion 81 is transferred to the partition wall 22 via the heat dissipation grease 92. The partition wall 22 is exposed to the suction chamber S2. Therefore, the partition wall 22 is cooled by the refrigerant sucked into the suction chamber S2. Thus, the switching element 70 is cooled by the refrigerant sucked into the suction chamber S2 via the first heat dissipation portion 81 and the partition wall 22.

[0063] In addition, the heat of the switching element 70 transferred to the first heat dissipation portion 81 is also transferred to the second heat dissipation portion 82 continuous with the first heat dissipation portion 81. The heat transferred to the second heat dissipation portion 82 is transferred to the partition wall 22 via the heat dissipation grease 92. That is, the switching element 70 is cooled by the refrigerant sucked into the suction chamber S2 via the second heat dissipation portion 82 and the partition wall 22. As a result, the cooling performance of the switching element 70 is improved.

[0064] Furthermore, the heat of the switching element 70 transferred to the first heat dissipation portion 81 is also transferred to the pair of third heat dissipation portions 83 continuous with the first heat dissipation portion 81. The heat transferred to the pair of third heat dissipation portions 83 is transferred to the partition wall 22 via the heat dissipation grease 92. That is, the switching element 70 is cooled by the refrigerant sucked into the suction chamber S2 via the pair of third heat dissipation portions 83 and the partition wall 22. Thus, the cooling performance of the switching element 70 is further improved.

[0065] [Effects of this embodiment]

[0066] The effects of this embodiment will be described.

[0067] (1) A metal heat dissipation member 80 is disposed between the switching element 70 and the partition wall 22. The heat dissipation member 80 includes a first heat dissipation portion 81 disposed between the heat generating portion 73a and the partition wall 22, and a second heat dissipation portion 82 continuous with the first heat dissipation portion 81 and disposed between the second end surface 72b of the resin member 72 and the partition wall 22. The heat of the switching element 70 is dissipated to the partition wall 22 not only via the first heat dissipation portion 81 but also via the second heat dissipation portion 82 continuous with the first heat dissipation portion 81. Thus, the cooling performance of the switching element 70 is improved.

[0068] (2) The switching element 70 is arranged in the converter housing chamber S1 in such a manner that the long side direction of the resin member 72 extends along the axial direction of the rotating shaft 13. Therefore, compared with the case where the long side direction of the resin member 72 extends in a direction orthogonal to the axial direction of the rotating shaft 13 in such a manner that the heat generating portion 73a abuts against the first wall surface 22a of the partition wall 22, the area of ​​the switching element 70 when viewed from the axial direction of the rotating shaft 13 is reduced. Thus, it is possible to suppress the converter 16 from being enlarged when viewed from the axial direction of the rotating shaft 13. As a result, it is possible to suppress the housing 11 from being enlarged when viewed from the axial direction of the rotating shaft 13. In addition, in the present embodiment, the entire converter 16 can be arranged on the partition wall 22. Therefore, not only the switching element 70 but also other heat generating components such as the coil 62 and the capacitor 63 can be cooled.

[0069] (3) The partition wall 22 has a receiving recess 24 that is recessed from the first wall surface 22a and protrudes from the second wall surface 22b. The switch element 70 is disposed in the receiving recess 24. Since the area of ​​the partition wall 22 exposed in the suction chamber S2 increases, the partition wall 22 becomes easier to be cooled by the refrigerant sucked into the suction chamber S2. As a result, the cooling performance of the switch element 70 is further improved.

[0070] (4) The heat dissipation member 80 includes a pair of third heat dissipation portions 83 that are continuous with the first heat dissipation portion 81 and disposed between the pair of third side surfaces 72e and the partition wall 22. Therefore, the heat of the switching element 70 is dissipated to the partition wall 22 not only through the first heat dissipation portion 81 and the second heat dissipation portion 82 but also through the pair of third heat dissipation portions 83. Thus, the cooling performance of the switching element 70 can be further improved.

[0071] (5) The switch element 70 and the heat dissipation member 80 are integrated by the rubber insulating member 90 provided between the second end surface 72b and the second heat dissipation portion 82 and between the pair of third side surfaces 72e and the pair of third heat dissipation portions 83. Thus, the switch element 70 and the heat dissipation member 80 can be easily handled compared to a case where the switch element 70 and the heat dissipation member 80 are separate bodies.

[0072] (6) The main portion 73 of each switching element 70 has an exposed portion 73b exposed on the second side surface 72d and the third side surface 72e. Therefore, when a plurality of switching elements 70 are housed in the converter housing chamber S1, it is necessary to ensure the insulation distance between the exposed portions 73b. Since the switching element 70 of this embodiment is an IGBT used at a high voltage, it is particularly necessary to ensure the insulation distance.

[0073] In the present embodiment, the insulating member 90 covers the second side surface 72d in addition to the second end surface 72b and the pair of third side surfaces 72e of the resin member 72. Therefore, the exposed portion 73b is covered by the insulating member 90. Therefore, it is easy to ensure the insulation distance between the exposed portions 73b. In this case, compared with the case where the insulation distance between the exposed portions 73b is ensured by increasing the intervals between the plurality of switching elements 70, the converter 16 is not easy to be enlarged.

[0074] (7) The insulating member 90 covers the five surfaces of the resin member 72 except the first side surface 72c. Therefore, the switch element 70 is pressed toward the first heat dissipation portion 81 by the insulating member 90. Thus, the heat generating portion 73a can be brought into close contact with the heat sink 91, and the heat sink 91 can be brought into close contact with the first heat dissipation portion 81.

[0075] (8) For example, the heat dissipation member 80 may have a fourth heat dissipation member facing the second side surface 72d of the resin member 72 in addition to the first to third heat dissipation members 81 to 83. However, when the fourth heat dissipation member is provided, since the heat dissipation member 80 becomes a square tube with a bottom having the second heat dissipation member 82 as a bottom wall, it becomes difficult to form the heat dissipation member 80. In addition, since the fourth heat dissipation member is a portion that is not continuous with the first heat dissipation member 81, it contributes less to the cooling effect of the switching element 70 than the second heat dissipation member 82 and the third heat dissipation member 83. Therefore, it is preferred that the heat dissipation member 80 has the first heat dissipation member 81, the second heat dissipation member 82 and a pair of third heat dissipation members 83 as heat dissipation members.

[0076] [Example of Change]

[0077] In addition, the above-mentioned embodiments can be implemented by modification as follows. The above-mentioned embodiments and the following modification examples can be implemented by combining with each other within the range of no technical contradiction.

[0078] The partition wall 22 may also have a protrusion protruding from the first wall surface 22a instead of the receiving recess 24. The protrusion is, for example, a square tube extending in the axial direction of the rotating shaft 13. The switch module 61 is arranged on the inner side of the protrusion. In detail, the first heat dissipation portion 81 is arranged between the heating portion 73a and the inner surface of the protrusion. The second heat dissipation portion 82 is arranged between the second end surface 72b of the resin member 72 and the first wall surface 22a of the partition wall 22. Each third heat dissipation portion 83 is arranged between the third side surface 72e of the resin member 72 and the inner surface of the protrusion.

[0079] In this case, the heat of the switching element 70 is transferred to the first heat dissipation portion 81, and is also transferred to the second heat dissipation portion 82 and the pair of third heat dissipation portions 83 that are continuous with the first heat dissipation portion 81. The heat transferred to the second heat dissipation portion 82 is transferred to the partition wall 22. The heat transferred to the first heat dissipation portion 81 and each of the third heat dissipation portions 83 is transferred to the protrusion. The protrusion is a part of the partition wall 22. Therefore, the protrusion is cooled by the refrigerant sucked into the suction chamber S2. As a result, the switching element 70 is cooled by the refrigerant sucked into the suction chamber S2 via the partition wall 22.

[0080] The structure of the housing 11 may be changed appropriately.

[0081] For example, the housing 11 may also include a motor housing with a bottom and a cylindrical converter housing connected to the bottom wall of the motor housing instead of the first housing structure 11a. In this case, the suction chamber S2 is divided by the inner surface of the motor housing and the shaft support member 12. The converter housing chamber S1 is divided by the inner surface of the converter housing and the inner surface of the cover 11c. The bottom wall of the motor housing is a partition wall separating the suction chamber S2 from the converter housing chamber S1.

[0082] The number of the receiving recessed portions 24 included in the partition wall 22 may be changed as appropriate.

[0083] For example, the three receiving recesses 24 in the above embodiment may be connected to each other to form one receiving recess 24 .

[0084] For example, the partition wall 22 may include six receiving recessed portions 24 . In this case, one switch module 61 is received in one receiving recessed portion 24 .

[0085] The arrangement of the switch modules 61 in the partition wall 22 may be changed as appropriate according to the arrangement of other components of the inverter 16. For example, the switch modules 61 of the U phase, the switch modules 61 of the V phase, and the switch modules 61 of the W phase may be arranged in a row.

[0086] The switching element 70 may be a switching element other than the IGBT.

[0087] The switch module 61 may not include the insulating member 90. In this case, the switch element 70 and the heat dissipation member 80 may be separate bodies or may be integrated by being fixed to each other with an adhesive or the like.

[0088] The heat dissipation member 80 only needs to be formed of a metal with high thermal conductivity, and does not need to be made of aluminum.

[0089] The heat dissipation member 80 only needs to include the first heat dissipation portion 81 and the second heat dissipation portion 82 , and may not include both or one of the pair of third heat dissipation portions 83 .

[0090] The heat dissipation member 80 may include a fourth heat dissipation portion facing the second side surface 72d of the resin member 72 in addition to the first heat dissipation portion 81, the second heat dissipation portion 82, and the pair of third heat dissipation portions 83. In this case, the heat dissipation member 80 is in the shape of a bottomed square tube with the second heat dissipation portion 82 as the bottom wall.

[0091] The insulating member 90 only needs to be formed of a material having insulating properties, and does not need to be made of rubber.

[0092] The heat sink 91 may be omitted. In this case, the first side surface 72 c and the heat generating portion 73 a of the resin member 72 abut against the first heat dissipating portion 81 .

[0093] The heat dissipating grease 92 may be replaced with potting (resin filling). In addition, the heat dissipating grease 92 may be omitted. In this case, each heat dissipating portion 81 to 83 abuts against the partition wall 22 .

[0094] The compression unit 15 may compress the refrigerant as long as the rotation shaft 13 rotates, and is not limited to a scroll type.

[0095] The electric compressor 10 of the above embodiment is used in a vehicle air conditioner, but is not limited thereto. For example, the electric compressor 10 may be mounted on a fuel cell vehicle and compress air as a fluid supplied to a fuel cell through the compression unit 15 .

Claims

1. An electric compressor comprising: Axis of rotation; an electric motor to rotate the rotating shaft; a compression part for compressing a fluid by the rotation of the rotating shaft; an inverter that drives the electric motor and has a switching element; as well as The metal housing has a partition wall that separates a suction chamber that accommodates the electric motor and sucks the fluid from a converter accommodating chamber that accommodates the converter. The switching element has: a conductive member having a main portion and a pin protruding from the main portion; and A rectangular parallelepiped resin member accommodating the main part, The resin member has: A first end surface, which is an end surface in the longitudinal direction and from which the pin protrudes; The second end face is an end face on the opposite side of the first end face in the long side direction; as well as The side surface connects the first end surface to the second end surface, The main portion has a heat generating portion exposed to the outside of the resin member at the side surface, The switching element is arranged in the inverter housing chamber in such a manner that the long side direction of the resin member extends in the axial direction of the rotating shaft. A metal heat dissipation member is disposed between the switch element and the partition wall. The heat dissipation component has: a first heat dissipation portion disposed between the heat dissipation portion and the partition wall; and The second heat dissipation portion is continuous with the first heat dissipation portion and is disposed between the second end surface and the partition wall.

2. The electric compressor according to claim 1, The partition wall has: The first wall surface is an end surface of the partition wall in the axial direction of the rotating shaft and is exposed in the converter accommodating chamber. a second wall surface located opposite to the first wall surface in the axial direction of the rotation axis; and a receiving recessed portion, which is recessed from the first wall surface and protrudes from the second wall surface, The switch element is disposed in the accommodating recess.

3. The electric compressor according to claim 1 or 2, The side has: a first side surface, the heat generating portion being exposed on the first side surface; a second side surface which is a surface opposite to the first side surface; and a pair of third side surfaces, connecting the first side surface and the second side surface, The heat dissipation member includes a pair of third heat dissipation portions which are continuous with the first heat dissipation portion and are arranged between the third side surface and the partition wall.

4. The electric compressor according to claim 3, The switching element and the heat dissipation member are integrated by a rubber insulating member provided between the second end surface and the second heat dissipation portion and between the pair of third side surfaces and the pair of third heat dissipation portions.

5. The electric compressor according to claim 4, The converter has a plurality of switching elements. The main parts of the plurality of switch elements each have an exposed portion exposed to the outside of the resin member at the second side surface and the third side surface. The insulating member covers the second side surface.

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