Motor compressor

Abstract

To restrain uneven thickness of a heat transfer member.SOLUTION: A first capacitor 731, a magnetic component 74, and a second capacitor 732 are sequentially mounted to a second circuit board 62, so that a projection amount from the second circuit board 62 gets smaller as it goes toward a bottom part 52b of a projection part 52 in an insertion direction. The projection part 52 is provided with a first thick part 54 and a second thick part 55. Potting agents 75 are provided between the first thick part 54 and the magnetic component 74, and between the first capacitor 731 and the second thick part 55, opposite to each other in a radial direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] The electric compressor described in Patent Document 1 includes a rotating shaft, a compression unit that compresses a fluid by rotation of the rotating shaft, a motor that drives the compression unit, an inverter that drives the motor, and a housing. The housing accommodates the rotating shaft, the compression unit, the motor, and the inverter. The inverter has a first circuit board on which a drive element that drives the motor is mounted, and a second circuit board on which electronic components that remove noise from the first circuit board are mounted. The first circuit board is housed in a first housing chamber, and the second circuit board is housed in a second housing chamber. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-58910 Summary of the Invention [Problem to be solved by the invention]

[0004] In such an electric compressor, a heat transfer member is provided between the electronic component in the second accommodating chamber and a fixing surface of the electronic component, and when the second circuit board and the electronic component are mounted in the housing, the second circuit board and the electronic component may be displaced in the axial direction of the rotation shaft within the second accommodating chamber. In this case, if the electronic component is displaced while in contact with the heat transfer member on the fixing surface of the second accommodating chamber, unevenness in the heat transfer member may occur, which is undesirable. [Means for solving the problem]

[0005] An electric compressor for solving the above problems includes a rotating shaft, a compression unit that compresses fluid by rotation of the rotating shaft, a motor that drives the compression unit, an inverter that drives the motor, and a housing that accommodates the rotating shaft, the compression unit, the motor, and the inverter, wherein the inverter has a first circuit board on which a drive element that drives the motor is mounted, and a second circuit board on which electronic components that remove noise from the first circuit board are mounted, and the housing includes a motor housing that accommodates the motor and defines a suction chamber that draws in fluid, a compression unit housing that accommodates the compression unit and discharges compressed fluid, and an inverter housing that defines an inverter accommodating chamber that accommodates the inverter. and a partition wall separating the suction chamber and the inverter accommodating chamber, wherein the motor housing has a bottomed cylindrical protrusion that protrudes radially from the rotating shaft beyond other portions through an opening through which the second circuit board is inserted from the partition wall side and extends in the insertion direction of the second circuit board, the second circuit board has a plurality of electronic components sequentially mounted on it so that the amount of protrusion from the second circuit board decreases as it approaches the bottom of the protrusion in the insertion direction, the protrusion has a thick portion that becomes thicker toward the electronic component that is facing it in the radial direction, and a heat transfer member is provided between the thick portion and the electronic component that are facing it in the radial direction.

[0006] According to the above configuration, when the second circuit board and the electronic components are inserted into the protruding portion, the electronic components are prevented from being displaced radially while in contact with the heat transfer member on the thick portion, thereby preventing unevenness in the thickness of the heat transfer member due to the electronic components being displaced radially while in contact with the heat transfer member.

[0007] In the electric compressor, the electronic components include a pair of capacitors and a magnetic component, the magnetic component is mounted on the second circuit board so as to be positioned between the capacitors, the protruding portion is provided with a first thick portion facing the magnetic component in the radial direction, and a second thick portion provided between the first thick portion and the bottom and facing one of the capacitors in the radial direction, and the heat transfer member may be provided between the first thick portion and the magnetic component facing each other in the radial direction, and between the second thick portion facing each other in the radial direction and one of the capacitors.

[0008] According to the above configuration, when the second circuit board and the pair of capacitors and magnetic components are inserted into the protrusion, it is possible to prevent one of the capacitors from coming into contact with the heat transfer member on the first thick portion, thereby preventing the thickness of the heat transfer member on the first thick portion from displacing radially.

[0009] In the electric compressor, the first thick portion faces the other capacitor in the axial direction of the rotating shaft, and the second thick portion faces the magnetic component in the axial direction, and the heat transfer member may be provided between the first thick portion and the other capacitor that face each other in the axial direction, and between the second thick portion and the magnetic component that face each other in the axial direction.

[0010] According to the above configuration, heat can be dissipated in the axial direction of the rotating shaft by the heat transfer member. [Effects of the Invention]

[0011] According to this invention, it is possible to suppress the occurrence of unevenness in the thickness of the heat transfer member. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a cross-sectional view showing an electric compressor. [Figure 2] FIG. 2 is a cross-sectional view showing a part of the electric compressor. [Figure 3]FIG. 3 is a cross-sectional view showing a part of the electric compressor. [Figure 4] FIG. 4 is a cross-sectional view illustrating a method for attaching a second circuit board and a plurality of second components to a housing. DETAILED DESCRIPTION OF THE INVENTION

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric compressor according to an embodiment of the present invention is used in, for example, a vehicle air conditioner. <Basic configuration of electric compressor> As shown in FIG. 1, the electric compressor 10 includes a housing 11. The housing 11 includes a discharge housing 12, a motor housing 13, and an inverter housing 51. The discharge housing 12, the motor housing 13, and the inverter housing 51 are made of metal materials. The discharge housing 12, the motor housing 13, and the inverter housing 51 are made of aluminum, for example. The discharge housing 12 is cylindrical. The motor housing 13 includes a plate-shaped end wall 13a, a cylindrical peripheral wall 13b, and a protrusion 52. The peripheral wall 13b extends cylindrically from the outer periphery of the end wall 13a. The protrusion 52 is cylindrical and has a bottom.

[0014] The electric compressor 10 includes a rotating shaft 14. The rotating shaft 14 is accommodated in a motor housing 13. The electric compressor 10 includes a compression unit 15, a motor 16, and an inverter 50. The compression unit 15 and the motor 16 are housed in a motor housing 13. Thus, the motor housing 13 houses the compression unit 15. The compression unit 15 is driven by the rotation of a rotary shaft 14. The compression unit 15 compresses a refrigerant fluid by the rotation of the rotary shaft 14. The motor 16 drives the compression unit 15 by rotating the rotary shaft 14. The compression unit 15 and the motor 16 are arranged side by side in an axial direction X, which is the direction in which the axis L of the rotary shaft 14 extends. The motor 16 is arranged closer to the end wall 13a of the motor housing 13 than the compression unit 15.

[0015] The electric compressor 10 includes a shaft support member 17. The shaft support member 17 is disposed within the motor housing 13, between the compression unit 15 and the motor 16. The shaft support member 17 has an insertion hole 17h. The insertion hole 17h is formed in the center of the shaft support member 17. A first end of the rotating shaft 14 is inserted into the insertion hole 17h. A bearing 18a is provided between the insertion hole 17h and the first end of the rotating shaft 14. The first end of the rotating shaft 14 is rotatably supported by the shaft support member 17 via the bearing 18a.

[0016] The motor housing 13 has a cylindrical bearing portion 19. The bearing portion 19 protrudes from the center of the end wall 13a of the motor housing 13. The second end of the rotary shaft 14 is inserted into the inside of the bearing portion 19. A bearing 18b is provided between the bearing portion 19 and the second end of the rotary shaft 14. The second end of the rotary shaft 14 is rotatably supported by the bearing portion 19 via the bearing 18b.

[0017] The compression section 15 has a fixed scroll 20 and an orbiting scroll 21. The fixed scroll 20 is fixed to the inner circumferential surface of the peripheral wall 13b of the motor housing 13. The orbiting scroll 21 is disposed opposite the fixed scroll 20. The fixed scroll 20 and the orbiting scroll 21 mesh with each other. A compression chamber 22, the volume of which can be changed, is defined between the fixed scroll 20 and the orbiting scroll 21. The compression chamber 22 compresses and discharges the drawn refrigerant.

[0018] The motor 16 has a cylindrical stator 24 and a cylindrical rotor 25. The rotor 25 is disposed inside the stator 24. The rotor 25 rotates integrally with the rotating shaft 14. The stator 24 surrounds the rotor 25. The rotor 25 has a rotor core 25a fixed to the rotating shaft 14 and a plurality of permanent magnets (not shown) provided on the rotor core 25a. The stator 24 has a cylindrical stator core 24a and a coil 26 wound around the stator core 24a. When power is supplied to the coil 26, the rotor 25 and the rotating shaft 14 rotate.

[0019] The motor housing 13 has a suction port 13h. The suction port 13h is formed in the peripheral wall 13b. The suction port 13h draws refrigerant into the motor housing 13. A first end of an external refrigerant circuit 27 is connected to the suction port 13h. A discharge chamber 12a is formed within the discharge housing 12. The discharge housing 12 has a discharge port 12h. The discharge port 12h is in communication with the discharge chamber 12a. A second end of the external refrigerant circuit 27 is connected to the discharge port 12h.

[0020] Refrigerant is drawn into the motor housing 13 from the external refrigerant circuit 27 through the suction port 13h. A suction chamber S is defined within the motor housing 13. That is, the motor housing 13 accommodates the motor 16 and defines the suction chamber S, which draws in fluid. The refrigerant drawn into the suction chamber S in the motor housing 13 is drawn into the compression chamber 22 by the orbiting scroll 21. The refrigerant in the compression chamber 22 is compressed by the orbiting scroll 21. The refrigerant compressed in the compression chamber 22 is then discharged into the discharge chamber 12a. Therefore, the refrigerant compressed by the compression section 15 is discharged from the motor housing 13 into the discharge chamber 12a. Therefore, the motor housing 13 also serves as a compression section housing that discharges compressed fluid. The discharge chamber 12a is a discharge pressure region. The refrigerant discharged into the discharge chamber 12a flows out to the external refrigerant circuit 27 through the discharge port 12h. The refrigerant that has flowed out into the external refrigerant circuit 27 passes through a heat exchanger and an expansion valve of the external refrigerant circuit 27, and returns to the motor housing 13 via the suction port 13h. The electric compressor 10 and the external refrigerant circuit 27 constitute a vehicle air conditioning system 28.

[0021] The inverter housing 51 opens toward the end wall 13a and the protrusion 52. The open end of the inverter housing 51 is attached to the end wall 13a and the protrusion 52, thereby attaching the inverter housing 51 to the motor housing 13. An inverter accommodating chamber S1 that accommodates the inverter 50 is defined in the space partitioned by the inside of the inverter housing 51 and the inside of the protrusion 52. Therefore, the housing 11 has the inverter housing 51 that partitions the inverter accommodating chamber S1 that accommodates the inverter 50. The end wall 13a of the motor housing 13 is a partition wall that separates the suction chamber S from the inverter accommodating chamber S1.

[0022] Here, one direction of the axial direction X is referred to as a first axial direction X1, and the direction opposite to the first axial direction X1 is referred to as a second axial direction X2. The inverter housing 51 has a cylindrical first tubular portion 51a extending in the axial direction X and a closing portion 51b closing the end of the first tubular portion 51a on the first axial direction X1 side. The first tubular portion 51a is, for example, cylindrical. The closing portion 51b is, for example, flat and extends perpendicular to the axial direction X. The inverter housing 51 has a first opening 51h that opens to the second axial direction X2. The first opening 51h is the open end of the first tubular portion 51a on the second axial direction X2 side.

[0023] 2 and 3, the protruding portion 52 has a cylindrical second cylindrical portion 52a extending in the axial direction X and a bottom portion 52b closing the end of the second cylindrical portion 52a on the second axial direction X2 side. The bottom portion 52b is, for example, in the shape of a flat plate extending perpendicular to the axial direction X. A first through hole 52c and a second through hole 52d are formed in the bottom portion 52b. The protruding portion 52 has a second opening portion 52h that opens in the first axial direction X1. The second opening portion 52h is the open end of the second cylindrical portion 52a on the first axial direction X1 side.

[0024] As shown in Fig. 1, a portion of the second cylindrical portion 52a in this embodiment is connected to the peripheral wall 13b of the motor housing 13. The second cylindrical portion 52a and the peripheral wall 13b may be integrally formed, or may be separate bodies that are connected to each other to form an integral body. Alternatively, a portion of the second cylindrical portion 52a may be formed by the peripheral wall 13b. Thus, the motor housing 13 is provided with a cylindrical protrusion 52 that protrudes radially from the rotary shaft 14 more than the other portions and has a bottom.

[0025] A portion of the first opening 51h and the second opening 52h face each other in the axial direction X. As a result, the inside of the protruding portion 52 communicates with the inside of the inverter housing 51 via the first opening 51h and the second opening 52h, and an inverter accommodating chamber S1 is defined between the inside of the protruding portion 52 and the inside of the inverter housing 51. A portion of the first opening 51h that does not face the second opening 52h in the axial direction X is closed by an end wall 13a of the motor housing 13.

[0026] The inverter housing 51 and the end wall 13a of the motor housing 13 define a first accommodation chamber 23a. The protrusion 52 and the peripheral wall 13b of the motor housing 13 define a second accommodation chamber 23b.

[0027] <Inverter> The inverter 50 that drives the motor 16 has a first circuit board 61 on which a drive element 70 that drives the motor 16 is mounted, and a second circuit board 62 on which a capacitor 73 and a magnetic component 74 are mounted as electronic components that remove noise from the first circuit board 61.

[0028] For example, the first circuit board 61 and the second circuit board 62 are flat. The first circuit board 61 extends in an orthogonal direction Y that is a direction perpendicular to the axis L of the rotating shaft 14. The second circuit board 62 extends in an axial direction X that is the direction in which the axis L of the rotating shaft 14 extends.

[0029] The first circuit board 61 is disposed in the first accommodating chamber 23a. As a result, the inverter housing 51 accommodates the first circuit board 61. The second circuit board 62 is disposed in the second accommodating chamber 23b. As a result, the protruding portion 52 accommodates the second circuit board 62. The second circuit board 62 is inserted from the second opening 52h in the protruding portion 52, and the second circuit board 62 is inserted into the protruding portion 52 so as to extend in the axial direction X. Therefore, the motor housing 13 is provided with a bottomed, cylindrical protruding portion 52 that protrudes radially from the end wall 13a, which serves as a partition wall, beyond other portions by the second opening 52h through which the second circuit board 62 is inserted, and that extends in the insertion direction of the second circuit board 62.

[0030] The first circuit board 61 and the second circuit board 62 are connected to each other by a wire 63. This wire 63 extends, for example, between the first housing chamber 23a and the second housing chamber 23b. 2 and 3, two wires 64 are connected to the second circuit board 62. Of the two wires 64, one wire 64 extends between the second accommodating chamber 23b and the outside of the housing 11 via the first through-hole 52c, and the other wire 64 extends between the second accommodating chamber 23b and the outside of the housing 11 via the second through-hole 52d.

[0031] The wiring 64 inserted into the first through hole 52c is connected to a high-voltage connector 81 outside the housing 11. For example, a connector for a high-voltage power supply as an external power supply (not shown in the drawings) is connected to the high-voltage connector 81. The wiring 64 inserted into the second through hole 52d is connected to a low-voltage connector 82 outside the housing 11. A connector for a low-voltage power supply (not shown in the drawings) is connected to the low-voltage connector 82.

[0032] <Drive elements and electronic components> As shown in Fig. 1, a driving element 70 for driving the motor 16 is mounted on the first circuit board 61. In Fig. 1, the driving element 70 is simplified and shown by a two-dot chain line. The driving element 70 may be composed of multiple components. A pair of capacitors 73 and a magnetic component 74 are mounted on the second circuit board 62 as electronic components.

[0033] 3, the magnetic component 74 is mounted on the second circuit board 62 so as to be located between the pair of capacitors 73 in the axial direction X. When viewed from the orthogonal direction Y, the pair of capacitors 73 and the magnetic component 74 are aligned in a straight line in the axial direction X. For example, the pair of capacitors 73 and the magnetic component 74 are aligned so that the centers of the pair of capacitors 73 and the magnetic component 74 are aligned in a straight line in the axial direction X when viewed from the orthogonal direction Y. Of the pair of capacitors 73, the capacitor that is smaller than the magnetic component 74 in the orthogonal direction Y is referred to as a first capacitor 731 as one capacitor, and the capacitor 73 that is larger than the magnetic component 74 in the orthogonal direction Y is referred to as a second capacitor 732 as the other capacitor.

[0034] As described above, the second circuit board 62 is inserted into the protruding portion 52 from the second opening 52h toward the bottom 52b of the protruding portion 52. The pair of capacitors 73 and magnetic component 74 are mounted in order such that the amount of protrusion from the second circuit board 62 decreases toward the bottom 52b of the protruding portion 52 in the insertion direction. Specifically, the first capacitor 731, the magnetic component 74, and the second capacitor 732 are mounted in this order such that the amount of protrusion from the second circuit board 62 increases in the first axis direction X1.

[0035] <Thick part> As shown in FIG. 2 , a first thick portion 54 and a second thick portion 55 are provided inside the protruding portion 52 in this embodiment. The first thick portion 54 and the second thick portion 55 are, for example, columnar and extend in the orthogonal direction Y from the inner circumferential surface of the second cylindrical portion 52a. The first thick portion 54 has a first fixing surface 54a at its tip protruding along the orthogonal direction Y. The second thick portion 55 has a second fixing surface 55a at its tip protruding along the orthogonal direction Y. The first fixing surface 54a in the orthogonal direction Y is closer to the motor housing 13 than the second fixing surface 55a in the orthogonal direction Y. A third fixing surface 56a is provided inside the protruding portion 52, and is closer to the motor housing 13 than the first fixing surface 54a in the first axial direction X1 than the first thick portion 54. The third fixing surface 56a is not provided in a thick portion but is formed on the outer circumferential surface of the peripheral wall 13b itself.

[0036] Further, from second opening 52h toward bottom 52b of protruding portion 52, the amount of protrusion of the thick portion from motor housing 13 increases in the order of first fixing surface 54a and second fixing surface 55a. Therefore, from second opening 52h toward bottom 52b, first fixing surface 54a to third fixing surface 56a approach second circuit board 62 in orthogonal direction Y in the order of third fixing surface 56a, first fixing surface 54a, and second fixing surface 55a.

[0037] Magnetic component 74 is fixed to first fixing surface 54a via potting material 75. First capacitor 731 is fixed to second fixing surface 55a via potting material 75, and second capacitor 732 is fixed to third fixing surface 56a via potting material 75.

[0038] Therefore, the protruding portion 52 is provided with a first thick portion 54 that faces the magnetic component 74 in the radial direction, and a second thick portion 55 that is provided between the first thick portion 54 and the bottom portion 52b and faces the first capacitor 731 in the radial direction. The potting material 75 is provided between the first thick portion 54 and the magnetic component 74, which face each other in the radial direction, and between the second thick portion 55 and the first capacitor 731, which face each other in the radial direction.

[0039] Furthermore, the first thick portion 54 faces the second capacitor 732 in the axial direction X of the rotating shaft 14, and the second thick portion 55 faces the magnetic component 74 in the axial direction X. The potting material 75 is provided between the first thick portion 54 and the second capacitor 732, which face each other in the axial direction X, and between the second thick portion 55 and the magnetic component 74, which face each other in the axial direction X. The potting material 75 exchanges heat between the peripheral wall 13b of the motor housing 13 and the pairs of capacitors 73 and magnetic components 74. Because a refrigerant flows inside the motor housing 13, the above-described heat exchange can cool the multiple pairs of capacitors 73 and magnetic components 74.

[0040] [Operation of the embodiment] Next, the operation of the embodiment will be described together with an example of a method for attaching the second circuit board 62 to the housing 11.

[0041] As shown in FIG. 4 , when attaching the second circuit board 62, the capacitor 73, and the magnetic component 74 to the housing 11, the capacitor 73 and the magnetic component 74 are first attached to the second circuit board 62 and integrated together. At this time, the inverter housing 51 is not attached to the housing 11. As a result, the second opening 52h of the protruding portion 52 is open to the outside of the housing 11. The second circuit board 62, the capacitor 73, and the magnetic component 74 integrated as described above are inserted into the protruding portion 52 through the second opening 52h by an operator. Within the protruding portion 52, the integrated second circuit board 62, the capacitor 73, and the magnetic component 74 are displaced in the second axial direction X2.

[0042] At this time, the pair of capacitors 73 and magnetic component 74 protrude from second circuit board 62 in the orthogonal direction Y in the order of first capacitor 731, magnetic component 74, and second capacitor 732, from the back in second axis direction X2. Furthermore, within protruding portion 52, the positions of second fixing surface 55a, first fixing surface 54a, and third fixing surface 56a, from the back in second axis direction X2, decrease in the orthogonal direction Y from peripheral wall 13b. This prevents first capacitor 731 from coming into contact with potting material 75 provided on third fixing surface 56a and first fixing surface 54a. Similarly, magnetic component 74 is prevented from coming into contact with potting material 75 provided on third fixing surface 56a.

[0043] This prevents unevenness in the potting material 75, which would otherwise occur if the capacitor 73 and the magnetic component 74 were displaced in the second axial direction X2 while in contact with the potting material 75. Then, when the second circuit board 62 is displaced to a predetermined position within the protruding portion 52, the attachment of the second circuit board 62, the capacitor 73, and the magnetic component 74 to the protruding portion 52 is completed. At this time, the potting material 75 is present between the first capacitor 731 and the second fixing surface 55a, between the magnetic component 74 and the first fixing surface 54a, and between the second capacitor 732 and the third fixing surface 56a. The first circuit board 61 and the inverter housing 51 are then attached to the housing 11.

[0044] [Effects of the embodiment] According to the above embodiment, the following effects can be obtained. (1) Second capacitor 732, magnetic component 74, and first capacitor 731 are sequentially mounted on second circuit board 62 so that the amount of protrusion from second circuit board 62 decreases toward bottom 52b of protruding portion 52 in the insertion direction. Furthermore, protruding portion 52 of housing 11 is provided with first thick portion 54 and second thick portion 55 that increase in thickness toward bottom 52b of protruding portion 52 in the insertion direction. This prevents unevenness in potting material 75 caused by displacement of first capacitor 731 and magnetic component 74 in second axial direction X2 while in contact with potting material 75. This allows the thickness of potting material 75 to be uniform between capacitor 732 and magnetic component 74 and first fixing surface 54a to third fixing surface 56a to which they are fixed.

[0045] (2) The potting material 75 is provided between the first thick portion 54 and the second capacitor 732, which face each other in the axial direction X, and between the second thick portion 55 and the magnetic component 74, which face each other in the axial direction X. This allows the potting material 75 to dissipate heat in the axial direction X.

[0046] (3) The plurality of electronic components include a pair of capacitors 73 and a magnetic component 74. The magnetic component 74 is located between the pair of capacitors 73 in the axial direction X. Therefore, by interposing the magnetic component 74 between the capacitors 73, it is possible to suppress noise propagation between the capacitors 73.

[0047] [Example of change] The embodiment can be modified as follows: The embodiment and the following modifications can be combined with each other within the scope of technical compatibility.

[0048] The shape of the inverter housing 51 can be changed. For example, in the protruding portion 52, the first cylindrical portion 51a and the closing portion 51b may be separate bodies, and the protruding portion 52 may be formed by connecting them. In this case, for example, when attaching the second circuit board 62, the capacitor 73, and the magnetic component 74 to the housing 11, the closing portion 51b may be removed from the housing 11. Then, for example, the second circuit board 62, the capacitor 73, and the magnetic component 74 may be accommodated in the protruding portion 52 through the open end of the first cylindrical portion 51a that was previously covered by the closing portion 51b.

[0049] The number of electronic components mounted on the second circuit board 62 is not limited to three. For example, the number of electronic components may be two, four, or more. In this case, the number of thick portions is increased or decreased depending on the number of electronic components. For example, when there are two electronic components, there is one thick portion, and potting material 75 is provided between one electronic component and the thick portion, and potting material 75 is provided between the remaining electronic component and the outer peripheral surface of the motor housing 13.

[0050] When viewed from the orthogonal direction Y, the capacitor 73 and the magnetic component 74 do not have to be aligned in a straight line in the axial direction X. For example, when viewed from the orthogonal direction Y, the capacitor 73 and the magnetic component 74 may be offset from each other in the direction of an imaginary line perpendicular to the axis L.

[0051] At least one of the pair of capacitors 73 and the magnetic component 74 may be omitted, or other electronic components may be added. The number of thick portions provided in the protruding portion 52 may be increased or decreased depending on the number of electronic components.

[0052] The thick portion may be formed by joining a separate member to the peripheral wall 13b. The heat transfer member may be a heat dissipation grease or a heat dissipation sheet other than the potting 75. The compression section 15 is not limited to a scroll type configured with the fixed scroll 20 and the orbiting scroll 21. The compression section 15 may be, for example, a vane type.

[0053] Although the electric compressor 10 constitutes the vehicle air-conditioning device 28 in the above embodiment, the present invention is not limited to this. For example, the electric compressor 10 may be mounted on a fuel cell vehicle, and may compress air as a fluid to be supplied to the fuel cell using the compression unit 15. [Explanation of symbols]

[0054] S...suction chamber, S1...inverter accommodating chamber, L...axis, X...axial direction, X1...first axial direction, X2...second axial direction, Y...orthogonal direction, 10...electric compressor, 11...housing, 13...motor housing, 13a...end wall as partition wall, 14...rotating shaft, 15...compression section, 16...motor, 50...inverter, 51...inverter housing, 52...protrusion, 52b...bottom, 54...first thick section, 55...second thick section, 70...drive element, 73...capacitor, 74...magnetic component, 75...potting agent as heat transfer member.

Claims

1. A rotation axis; a compression unit that compresses a fluid by rotation of the rotary shaft; a motor that drives the compression unit; an inverter that drives the motor; a housing that accommodates the rotating shaft, the compression unit, the motor, and the inverter, the inverter includes a first circuit board on which a driving element for driving the motor is mounted, and a second circuit board on which electronic components for removing noise from the first circuit board are mounted, the housing includes a motor housing that accommodates the motor and defines a suction chamber that draws in fluid, a compression section housing that accommodates the compression section and discharges compressed fluid, an inverter housing that defines an inverter accommodating chamber that accommodates the inverter, and a partition wall that separates the suction chamber from the inverter accommodating chamber, the motor housing is provided with a cylindrical protrusion with a bottom that protrudes radially from the rotary shaft beyond other portions through an opening through which the second circuit board is inserted from the partition wall side and extends in an insertion direction of the second circuit board, the plurality of electronic components are sequentially mounted on the second circuit board such that the amount of protrusion from the second circuit board decreases toward the bottom of the protruding portion in the insertion direction, The protruding portion is provided with a thick portion whose thickness increases toward the electronic component facing the protruding portion in the radial direction, The electric compressor according to claim 1, wherein a heat transfer member is provided between the thick portion and the electronic component, which are opposed to each other in the radial direction.

2. the electronic component includes a pair of capacitors and a magnetic component; the magnetic component is mounted on the second circuit board so as to be located between the capacitors; the protruding portion is provided with a first thick portion facing the magnetic component in the radial direction, and a second thick portion provided between the first thick portion and the bottom portion and facing one of the capacitors in the radial direction, 2. The electric compressor according to claim 1, wherein the heat transfer member is provided between the first thick portion and the magnetic component, which are opposed in the radial direction, and between the second thick portion and one of the capacitors, which are opposed in the radial direction.

3. the first thick portion faces the other of the capacitors in the axial direction of the rotating shaft, and the second thick portion faces the magnetic component in the axial direction, 3. The electric compressor according to claim 2, wherein the heat transfer member is provided between the first thick portion and the other of the capacitors, which are opposed in the axial direction, and between the second thick portion and the magnetic component, which are opposed in the axial direction.

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