Electric compressor

Abstract

[Problem] To provide an electric compressor that reduces conductive noise while avoiding impairment of assemblability. [Solution] An electric compressor 10 comprises a compression mechanism 20, a motor 30, and an inverter 40. The inverter 40 includes: an inverter case 60 and an inverter cover 70 that form an accommodation space S in which an inverter component 50 is accommodated; and a connector 80. The connector 80 includes: an external connection part 81a that is disposed outside the inverter case 70 and connected to an object to which the connector 80 is to be connected; and a lead terminal 82 that includes an inner lead terminal portion 82a disposed in the inverter case 70 and connected to the inverter component 50. The inverter case 60 includes a case-side surrounding wall 63 that has a pocket shape surrounding a lead disposition space S1 in the accommodation space S in which the inner lead terminal portion 82a is disposed, thereby partitioning the lead disposition space S1 from another space S2 in the accommodation space S.

Description

Electric compressor 【0001】 The present invention relates to an electric compressor including a compression mechanism that compresses a working fluid by the movement of a movable member with respect to a fixed member, a motor, and an inverter. 【0002】 Conventionally, as a compressor used in a refrigerant circuit or the like of an air conditioner for an electric vehicle, which sucks and compresses the working fluid (refrigerant) of the air conditioner and discharges it to a discharge pipe, there is known one including a compression mechanism that compresses a working fluid by the movement of a movable member with respect to a fixed member, a motor for driving the compression mechanism, and an inverter (see, for example, Patent Document 1). 【0003】 Japanese Patent Application Laid-Open No. 2024-60621 【0004】 There is a problem that electromagnetic noise generated in the inverter electric circuit is detected as conduction noise through a cable connected to the outside. 【0005】 Therefore, an object of the present invention is to solve these problems and provide an electric compressor that reduces conduction noise from the inverter to the outside while avoiding impairment of the assemblability. 【0006】 The present invention is an electric compressor including a compression mechanism that compresses a working fluid by the movement of a movable member with respect to a fixed member, a motor for driving the compression mechanism, and an inverter, wherein the inverter has an inverter case and an inverter cover that form a housing space for housing inverter components, and a connector attached to the inverter case, the connector has an external connection portion disposed outside the inverter case and connected to a connection target of the connector, and a lead terminal including an inner lead terminal portion disposed inside the inverter case and connected to the inverter components, and the inverter case has a case-side surrounding wall that pocket-shapedly surrounds a lead arrangement space in which the inner lead terminal portion is disposed in the housing space and partitions it from other spaces in the housing space, thereby solving the above problems. 【0007】 In the present invention, it is possible to reduce conduction noise from the inverter to the outside while avoiding impairment of the assemblability. 【0008】 A cross-sectional view showing an electric compressor according to one embodiment of the present invention. This is an explanatory diagram illustrating the form of the inverter case and inverter cover. A cross-sectional view shown in Figure 2, viewed from position iii-iii in the direction of the arrow. 【0009】 An electric compressor 10 according to one embodiment of the present invention will be described below with reference to the drawings. 【0010】 First, the electric compressor 10 is used in the refrigerant circuit of an air conditioning system for electric vehicles and is configured as a compressor (in this embodiment, a so-called horizontally mounted inverter-integrated scroll-type electric compressor) that sucks in and compresses the working fluid (refrigerant) of the air conditioning system and discharges it to the discharge pipe. As shown in Figure 1, it comprises a compression mechanism 20 that compresses the working fluid by the movement of a movable member 22 relative to a fixed member 21 (in this embodiment, the orbital rotational movement of the movable scroll member 22 relative to a fixed scroll member 21), a motor 30 for driving the compression mechanism 20, and an inverter 40 for driving the motor 30. 【0011】 The inverter 40 converts direct current from the vehicle's battery (not shown) into three-phase alternating current and supplies it to the motor 30. As shown in Figures 1 to 3, it comprises an inverter component 50, an inverter case 60 and an inverter cover 70 that constitute a housing space S for housing the inverter component 50, a connector 80 attached to the inverter case 60, and a fastening member 90 for fixing the circuit board 51, which is the inverter component 50, to the inverter case 60. Figure 2(a) shows the inverter case 60 with the inverter cover 70 removed, and Figure 2(b) shows the inverter case 60 with the inverter cover 70 attached, viewed from the top plate portion 71 side of the inverter cover 70. 【0012】 The inverter components 50 are various parts that make up the inverter 40, and as shown in Figure 3, the inverter components 50 include a circuit board (rigid circuit board) 51 to which the lead terminals 82 of the connector 80 are electrically connected, and various electronic components. 【0013】In this embodiment, the connector 80 is used to supply power from a vehicle battery (not shown) to the inverter 40. As shown in Figures 2 and 3, it has a connector body 81 which is located outside the inverter case 60 and has an external connection portion 81a that is connected to the object to which the connector 80 is connected (not shown; in this embodiment, a power supply harness or cable to which the mating connector connected to the connector 80 is attached), and a lead terminal 82 which is located inside the inverter case 60 (in the housing space S) and includes an internal lead terminal portion 82a that is connected to the inverter components 50. In this embodiment, the lead terminal 82 is configured as an L-shaped lead terminal, and as shown in Figures 2 and 3, it extends from inside the connector body 81 and is positioned so that the tip side that connects to the substrate 51 is located inside the housing space S, passing through a through hole formed in the inverter case 60 (outer peripheral wall portion 62). As shown in Figure 3, the tip side of the lead terminal 82 is inserted into a through hole formed in the substrate 51 and soldered to connect and fix it to the substrate 51. 【0014】 The inverter case 60 and inverter cover 70 are made of metal (aluminum in this embodiment) and, as shown in Figure 1, have top plate portions 61 and 71 and outer peripheral wall portions 62 and 72 that hang down from the periphery of the top plate portions 61 and 71, respectively. 【0015】As shown in Figures 2 and 3, the inverter case 60 has a case-side surrounding wall 63 that surrounds the lead arrangement space S1, where the inner lead terminal portion 82a is located, in a pocket-like manner, and separates it from other spaces S2 within the housing space S. As shown in Figure 2, when viewed in a direction perpendicular to the substrate 51 (up and down direction in Figure 3), the case-side surrounding wall 63 works in cooperation with the outer peripheral wall portion 62 of the inverter case 60 to surround the entire area around the portion of the lead terminal 82 that is located within the housing space S (with a gap between it and the lead terminal 82). In this embodiment, the case-side surrounding wall 63 is integrally formed with the inverter case 60 (the top plate portion 61 and the outer peripheral wall portion 62), but the case-side surrounding wall 63 may be formed separately from the inverter case 60 and attached and fixed to the inverter case 60. Furthermore, at least a portion of the case-side surrounding wall 63 may be made of a magnetic material, that is, the entire case-side surrounding wall 63 may be made of a magnetic material, or a portion of the case-side surrounding wall 63 may be made of a magnetic material, such as by covering the surface of the case-side surrounding wall 63 with a magnetic material. As shown in Figures 2 and 3, the case-side surrounding wall 63 has a fastened portion 63a to which the fastening member 90 is fastened, and specifically, it integrally has a boss-shaped fastened portion 63a into which the fastening member 90, configured as a fastening bolt, is inserted and screwed. 【0016】As shown in Figures 2 and 3, the inverter cover 70 has a cover-side surrounding wall 73 that works in cooperation with the case-side surrounding wall 63 to separate the lead arrangement space S1, where the lead terminals 82 are located, from the other spaces S2 of the housing space S. As shown in Figure 2, when viewed in a direction perpendicular to the substrate 51 (up and down direction in Figure 3), the cover-side surrounding wall 73 works in cooperation with the outer peripheral wall portion 72 of the inverter cover 70 to surround (enclose) the entire area around the inner lead terminal portion 82a of the lead terminals 82 that are located within the housing space S (with a gap between it and the lead terminals 82). In this embodiment, as can be seen from Figure 2, when viewed in a direction perpendicular to the substrate 51 (up and down direction in Figure 3), the case-side surrounding wall 63 and the cover-side surrounding wall 73 are formed to overlap. Furthermore, in this embodiment, the cover-side surrounding wall 73 is integrally formed with the inverter cover 70 (the top plate portion 71 and the outer peripheral wall portion 72), but the cover-side surrounding wall 73 may be formed separately from the inverter cover 70 and attached and fixed to the inverter cover 70. Also, at least a part of the cover-side surrounding wall 73 may be made of a magnetic material, that is, the entire cover-side surrounding wall 73 may be made of a magnetic material, or a part of the cover-side surrounding wall 73 may be made of a magnetic material, such as by covering the surface of the cover-side surrounding wall 73 with a magnetic material. As shown in Figures 2 and 3, the cover-side surrounding wall 73 has an insertion portion 73a into which the fastening member 90 is inserted, and specifically, it integrally has a boss-shaped insertion portion 73a into which the fastening member 90, configured as a fastening bolt, is inserted. 【0017】As shown in Figure 3, the case-side surrounding wall 63 and the cover-side surrounding wall 73 have portions that cooperate to sandwich a part of the substrate 51 when the inverter cover 70 is attached to the inverter case 60. In this embodiment, a part of the substrate 51 is sandwiched between the fastened portion 63a of the case-side surrounding wall 63 and the inserted portion 73a of the cover-side surrounding wall 73. In this embodiment, as shown in Figures 2 and 3, the substrate 51 is arranged across (straddles) both the lead arrangement space S1 and the other space S2. Also, in this embodiment, as shown in Figure 3, when the inverter cover 70 is attached to the inverter case 60, the case-side surrounding wall 63 and the cover-side surrounding wall 73 do not contact the substrate 51 in portions other than the fastened portion 63a and the inserted portion 73a, and a gap is formed between the case-side surrounding wall 63 and the cover-side surrounding wall 73. 【0018】The electric compressor 10 of this embodiment obtained in this way has a case-side surrounding wall 63 that surrounds the lead arrangement space S1 where the inner lead terminal portion 82a is located in a pocket shape, separating it from other spaces S2 in the housing space S, thereby reducing conducted noise from the inverter 40 to the outside. That is, when a connector 80 connecting the inside and outside of the inverter 40 is installed as in this embodiment, noise generated from the inverter components 50 may be conducted to the outside of the inverter 40 via the connector 80 (and its lead terminals 82). Although the transmission of noise from the inverter components 50 to the connector 80 via the circuit board wiring can be suppressed by placing an EMI filter (EMI rejection filter, EMI filter) etc. between the main circuit of the inverter components 50 and the connector 80, when the lead terminals 82 of the connector 80 are located inside the housing space S as in this embodiment, the inner lead terminal portion 82a of the lead terminals 82 may function as an antenna, receiving electromagnetic wave noise from the inverter components 50 transmitted through space, and the received noise may be conducted to the outside through the connector 80. Therefore, in this embodiment, by providing a case-side surrounding wall 63 that surrounds the lead arrangement space S1 where the inner lead terminal portion 82a is located in a pocket-like shape and separates it from other spaces S2 in the housing space S, it is possible to suppress the reception of electromagnetic wave noise generated from the inverter component 50 (installed in other spaces S2) by the lead terminal 82, thereby reducing conducted noise from the inverter 40 to the outside. 【0019】 Furthermore, by providing a case-side enclosure wall 63 on the inverter case 60 (i.e., either forming the case-side enclosure wall 63 integrally with the inverter case 60, or forming the case-side enclosure wall 63 separately from the inverter case 60 and fixing it to the inverter case 60), it is not necessary to separately provide and assemble a shielding member to block electromagnetic noise when assembling the electric compressor 10, thus avoiding any loss of ease of assembly. 【0020】Furthermore, because the inverter cover 70 has a cover-side surrounding wall 73 that works in cooperation with the case-side surrounding wall 63 to separate the lead arrangement space S1 from other spaces S2 in the housing space S, it is possible to surround the lead arrangement space S1 from both the inverter case 60 side and the inverter cover 70 side. Therefore, electromagnetic noise reception by the lead terminals 82 can be more reliably suppressed without requiring any design changes to the inverter components 50, including the circuit board 51. 【0021】 Furthermore, since the case-side surrounding wall 63 and the cover-side surrounding wall 73 have portions that cooperate to sandwich a part of the circuit board 51 when the inverter cover 70 is attached to the inverter case 60, it is possible to suppress the transmission of vibrations from the connector 80's connection target (harness or cable) to the circuit board 51 via the lead terminals 82 to other inverter components 50, etc., thereby improving the reliability of the inverter 40. 【0022】 Furthermore, since the case-side surrounding wall 63 has a fastening portion 63a to which a fastening member 90 for fixing the substrate 51 to the inverter case 60 is fastened, it is possible to more reliably suppress the transmission of the above vibration to other inverter components 50, etc., thereby improving the reliability of the inverter 40. 【0023】 Furthermore, if at least a portion of the case-side surrounding wall 63 (and the cover-side surrounding wall 73) is made of a magnetic material, electromagnetic noise reaching the lead terminals 82 can be suppressed more reliably. 【0024】 Although embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the present invention as described in the claims, such as constructing the electric compressor 10 by arbitrarily combining the configurations of the above or below embodiments or modified examples. 【0025】 For example, in the embodiment described above, the connector 80 was described as a power supply connector, but the use of the connector 80 can be anything, such as for signal transmission. 【0026】10...Electric compressor 20...Compression mechanism 21...Fixed member 22...Movable member 30...Motor 40...Inverter 50...Inverter component 51...Circuit board 60...Inverter case 61...Top plate 62...Outer peripheral wall 63...Case side surrounding wall 63a...Fastened part 70...Inverter cover 71...Top plate 72...Outer peripheral wall 73...Cover side surrounding wall 73a...Inserted part 80...Connector 81...Connector body 81a...External connection part 82...Lead terminal 82a...Inner lead terminal part 90...Fastening member S...Housing space S1...Lead arrangement space S2...Other space

Claims

1. An electric compressor comprising a compression mechanism for compressing a working fluid by the movement of a movable member relative to a fixed member, and a motor and inverter for driving the compression mechanism, wherein the inverter has an inverter case and an inverter cover that constitute a housing space for housing inverter components, and a connector attached to the inverter case, the connector has an external connection portion disposed outside the inverter case and connected to the target to which the connector is to be connected, and a lead terminal including an internal lead terminal portion disposed inside the inverter case and connected to the inverter components, and the inverter case has a case-side surrounding wall that encloses the lead arrangement space in which the internal lead terminal portion is disposed in a pocket-like manner, separating it from other spaces in the housing space.

2. The electric compressor according to claim 1, characterized in that the inverter cover has a cover-side surrounding wall that cooperates with the case-side surrounding wall to separate the lead arrangement space from other spaces in the housing space.

3. The electric compressor according to claim 2, characterized in that the case-side surrounding wall and the cover-side surrounding wall have portions that cooperate to sandwich a part of the circuit board to which the inner lead terminal portion of the inverter component is connected when the inverter cover is attached to the inverter case.

4. The electric compressor according to claim 1, further comprising a fastening member for fixing the circuit board to which the inner lead terminal portion of the inverter component is connected to the inverter case, wherein the case-side surrounding wall has a fastened portion to which the fastening member is fastened.

5. The electric compressor according to claim 1, characterized in that at least a portion of the case-side surrounding wall is made of a magnetic material.

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