Electric compressor

Abstract

The technical problem is to provide an electric compressor capable of ensuring an insulation distance between press-fit terminals connecting a seal pin with a relatively simple structure. The electric compressor (1) is provided with: a motor chamber (12) in which an electric motor (2) is built; an inverter housing section (13) to which an inverter (3) for supplying power to the electric motor (2) is mounted; a seal plate (52) provided on a partition wall between the motor chamber (12) and the inverter housing section (13); and a plurality of press-fit terminals (56) provided on the circuit board (51) of the inverter (13). In the electric compressor (1), the seal pins (53) of the seal plate (52) are connected to the press-fit terminals (56). Comprising an insulating cover (61) which is arranged between the press-fit terminals (56) and is arranged on the circuit substrate (51).

Description

Technical Field

[0001] The present invention relates to an electric compressor in which a sealing pin of a sealing plate is connected to a press-fit terminal provided on a circuit substrate of an inverter. Background Art

[0002] For example, an inverter-integrated electric compressor is used as a refrigerant compressor used in an air conditioning device of an electric vehicle, and an inverter is installed in an inverter housing formed in a housing. In this case, a motor is housed in a motor chamber of the housing, and a sealing plate is provided on a partition wall between the motor chamber and the inverter housing. Furthermore, three sealing pins of the sealing plate are electrically connected to a circuit substrate of the inverter, but as a connection structure at this time, a method is adopted in which three press-fit terminals called power baskets are pre-arranged on the circuit substrate, and the sealing pins are press-fitted and connected to each press-fit terminal (for example, refer to Patent Document 1). Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent No. 6303957 Patent Document 2: Japanese Patent Application Publication No. 2000-252607 Summary of the invention Technical problem to be solved by the invention

[0004] In addition, in recent years, such electric compressors are also required to be of high voltage, and ensuring the insulation distance between the press-fit terminals corresponding to the high voltage specification has become a technical problem. Therefore, in the past, the insulation distance was obtained by keeping the intervals between the sealing pins unchanged and expanding the intervals between the press-fit terminals on the circuit substrate side. Each sealing pin and each press-fit terminal were connected by a connecting terminal, but multiple (three) connecting terminals were required, which resulted in an increase in the number of components and a complicated structure.

[0005] On the other hand, there is a structure in which an insulating frame is arranged between terminals to ensure an insulating distance (for example, refer to Patent Document 2).

[0006] The present invention has been made to solve the above-mentioned conventional technical problems, and an object of the present invention is to provide an electric compressor capable of ensuring an insulation distance between press-fit terminals connected to a sealing pin with a relatively simple structure. Means for solving technical problems

[0007] The electric compressor of the present invention comprises: a motor chamber which houses a motor; an inverter housing which is installed with an inverter for supplying power to the motor; a sealing plate which is arranged on a partition wall between the motor chamber and the inverter housing; and a plurality of press-fit terminals which are arranged on a circuit substrate of the inverter, wherein the sealing pins of the sealing plate are connected to each press-fit terminal, and is characterized in that it comprises an insulating cover which is located between the press-fit terminals and is arranged on the circuit substrate.

[0008] The electric compressor of the invention of technical solution 2 is characterized in that, in the above invention, it includes a slit formed on the circuit substrate located between each press-fit terminal, and the insulating cover has a snap-fit ​​portion, which is inserted into the slit and snap-fits with the circuit substrate using elasticity, thereby fixing the insulating cover to the circuit substrate.

[0009] The electric compressor of the invention of technical solution 3 is characterized in that, in the above invention, at least three press-fit terminals are arranged on the circuit substrate, and the insulating cover includes: a pair of insulating wall portions respectively located between adjacent press-fit terminals; and a connecting portion connecting the insulating wall portions.

[0010] The electric compressor of the invention according to claim 4 is characterized in that, in the above invention, the engaging portion is formed on each insulating wall portion, and each insulating wall portion is formed with a plurality of abutting portions that abut against the circuit board to prevent movement of the insulating cover.

[0011] The electric compressor according to the invention of claim 5 is characterized in that, in the above invention, at least one of the contact portions has a shape that obliquely intersects with the plane direction of the circuit board.

[0012] The electric compressor according to the invention of claim 6 is characterized in that, in the invention of claim 4 or 5, at least one of the contact portions has a shape that is orthogonal to the plane direction of the circuit board. Effects of the Invention

[0013] According to the present invention, the electric compressor includes: a motor chamber with a motor built in; an inverter housing portion with an inverter installed to supply power to the motor; a sealing plate provided on a partition wall between the motor chamber and the inverter housing portion; and a plurality of press-fit terminals provided on a circuit substrate of the inverter, wherein the sealing pins of the sealing plate are connected to each press-fit terminal, and since the insulating cover is provided on the circuit substrate in a form located between the press-fit terminals, the insulating distance between the press-fit terminals connecting the sealing pins of the sealing plate can be ensured by installing the insulating cover in a relatively simple structure. Thus, the high voltage standardization of the electric compressor can be fully coped with.

[0014] In this case, when a slit is formed between each press-fit terminal in order to ensure the insulation distance in the plane direction relative to the circuit substrate, if a snap-fit ​​portion is provided on the insulation cover as in the invention of technical solution 2, the snap-fit ​​portion is inserted into the slit, and the elasticity of the insulation cover itself is used to snap-fit ​​with the circuit substrate, no special design changes are required, and the insulation cover can be easily fixed to the circuit substrate without affecting other components in the inverter housing. As a result, it is also possible to achieve commonality with components of electric compressors of other specifications, which is generally convenient.

[0015] In addition, at least three press-fit terminals are provided on the circuit substrate, but if a pair of insulating wall portions located between adjacent press-fit terminals and a connecting portion connecting the insulating wall portions are formed on the insulating cover as in the invention of technical solution 3, the insulation distance between adjacent press-fit terminals can be reliably and stably ensured with a simple structure. In addition, there is also the following effect: by adjusting the height dimension of each insulating wall portion of the insulating cover from the circuit substrate, the necessary insulation distance can be set.

[0016] In this case, if, as in the invention of technical solution 4, a locking portion is formed on each insulating wall portion, and multiple abutment portions are formed on each insulating wall portion that abut against the circuit substrate to prevent the movement of the insulating cover, the insulating cover can be stably mounted on the circuit substrate, which is extremely beneficial for a vehicle-mounted electric compressor that is exposed to vibration during driving.

[0017] Furthermore, if at least one of the contact portions is formed to have a shape that obliquely intersects with the plane direction of the circuit board as in the invention of claim 5, the mounting state of the circuit board can be stabilized by utilizing the elasticity of the insulating cover itself.

[0018] In addition, even if at least one of the contact portions is formed to have a shape perpendicular to the plane direction of the circuit board as in the invention according to claim 6, the mounting state can be stabilized by the surface contact with the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic cross-sectional view of an electric compressor according to one embodiment of the present invention. Figure 2 yes Figure 1 Detailed cross-sectional view of the inverter housing portion of the electric compressor. Figure 3 yes Figure 1 A three-dimensional diagram of an electric compressor. Figure 4 The cover and press-fit terminals are removed. Figure 1 A top view of an inverter housing for an electric compressor. Figure 5 yes Figure 4 An enlarged view of the main part. Figure 6 yes Figure 1 An enlarged perspective view of the press-fit terminal portion of an electric compressor. Figure 7 yes Figure 1 A three-dimensional view of an insulating cover of an electric compressor. Figure 8 yes Figure 1 Another perspective view of the insulating cover of the electric compressor. Fig. 9is Figure 6 This is a diagram showing the state where the insulation cover is installed. Fig.10 yes Figure 1 An enlarged cross-sectional view of a press-fit terminal portion of an electric compressor. Fig.11 yes Fig.10 An enlarged cross-sectional view of the press-fit terminal portion of the central sealing pin. Fig.12 Yes Description Figure 7 FIG. 1 is a diagram showing an installation state of an insulating cover mounted on a circuit board. Fig.13 yes Figure 3 Exploded perspective view of an electric compressor. Fig.14 yes Figure 3 Another exploded perspective view of the electric compressor. Fig.15 yes Figure 3 Another exploded perspective view of the electric compressor. Fig.16 yes Figure 3 Another exploded perspective view of the electric compressor. Fig.17 It is an enlarged cross-sectional view of a press-fit terminal portion to which a sealing pin is installed at the center of an insulating cover according to another embodiment. Fig.18 It is an enlarged cross-sectional view of a press-fit terminal portion to which a sealing pin is installed at the center of an insulation cover according to still another embodiment. Fig.19 It is a diagram for explaining a state where an insulating cover according to still another embodiment is mounted on a circuit board. Fig. 20 It is an enlarged cross-sectional view of a press-fit terminal portion to which a sealing pin is installed at the center of an insulating cover according to still another embodiment. DETAILED DESCRIPTION

[0020] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. Figure 1 It is a schematic cross-sectional view of an electric compressor 1 to which one embodiment of the present invention is applied.

[0021] The electric compressor 1 of the embodiment is used, for example, in the refrigerant circuit of an air-conditioning device for an electric vehicle, and sucks in refrigerant as the working fluid of the air-conditioning device, and discharges it to a discharge pipe after compression. It is a so-called horizontal inverter-integrated scroll electric compressor, which includes: a three-phase electric motor 2 as the motor of the present invention; an inverter 3 for operating the electric motor 2; and a scroll compression mechanism 4 as a compression mechanism driven by the electric motor 2.

[0022] The electric compressor 1 of the embodiment includes: a stator housing 7, which accommodates an electric motor 2 and a center housing 6 on the inside; an inverter housing 8, which is installed on the end wall 7A of one end side of the stator housing 7 and accommodates the inverter 3 on the inside thereof; and a rear housing 9, which is installed on the other end side of the stator housing 7.

[0023] The stator housing 7 , the inverter housing 8 , and the rear housing 9 are all made of metal (aluminum in the embodiment), and are integrally joined to form a housing 11 of the electric compressor 1 of the embodiment.

[0024] A motor chamber 12 for accommodating the electric motor 2 is formed in the stator housing 7, and one end face of the motor chamber 12 is basically closed by the end wall 7A of the stator housing 7. Moreover, the end wall 7A serves as a partition wall for partitioning the motor chamber 12 and the inverter accommodating portion 13 described later. The other end face of the motor chamber 12 is open, and after the electric motor 2 is accommodated in the opening, the center housing 6 is accommodated. In addition, a sub-bearing 16 is installed on the inner surface (motor chamber 12 side) of the end wall 7A, and the sub-bearing 16 is used to rotatably support one end of the drive shaft 14 of the electric motor 2.

[0025] The center casing 6 is opened on the side opposite to the electric motor 2 (the other end side). After accommodating the movable scroll 22 described later of the scroll compression mechanism 4, the opening is closed by being fixed to the stator casing 7 through the rear shell 9, on which the fixed scroll 21 of the scroll compression mechanism 4, also described later, is fixed.

[0026] In addition, a through hole 17 is opened on the center casing 6 for inserting the other end of the driving shaft 14 of the electric motor 2, and a main bearing 18 is installed in the center casing 6 on the side of the scroll compression mechanism 4 of the through hole 17. The main bearing 18 can rotatably support the other end of the driving shaft 14 on the side of the scroll compression mechanism 4.

[0027] The electric motor 2 is composed of a stator 25 and a rotor 23. The stator 25 is fixed to the inner side of the peripheral wall of the stator housing 7 and is wound with a coil. The rotor 23 rotates inside the stator 25. For example, the direct current from the battery (not shown) of the vehicle is converted into a three-phase alternating current by the inverter 3, and the coil of the stator 25 of the electric motor 2 is supplied with power, thereby driving the rotor 23 to rotate. The drive shaft 14 is fixed to the rotor 23.

[0028] In addition, a suction port 21 is formed on the stator housing 7. The refrigerant sucked from the suction port 21 flows into the center housing 6 after passing through the electric motor 2 in the stator housing 7, and is sucked by the suction portion 37 outside the scroll compression mechanism 4. Thus, the electric motor 2 is cooled by the sucked refrigerant. In addition, the refrigerant compressed by the scroll compression mechanism 4 is configured to be discharged from the discharge chamber 27 described later through the discharge port 20 formed in the rear housing 9 to the discharge piping of the refrigerant circuit (not shown) outside the housing 11.

[0029] The scroll compression mechanism 4 is composed of the aforementioned fixed scroll 21 and movable scroll 22. The fixed scroll 21 integrally includes a disc-shaped mirror plate 23 and a scroll-shaped surround 24, and the surround 24 is composed of an involute shape or a curve close to an involute shape erected on the surface (one side) of the mirror plate 23, and the surface of the mirror plate 23 on which the surround 24 is erected is fixed to the rear shell 9 as the center casing 6 side. A discharge hole 26 is formed in the center of the mirror plate 23 of the fixed scroll 21, and the discharge hole 26 is connected to the discharge chamber 27 in the rear shell 9. In the figure, the symbol 28 is a discharge valve provided at the opening on the back side (the other side) of the mirror plate 23 of the discharge hole 26.

[0030] The movable scroll 22 is a scroll that revolves and swirls relative to the fixed scroll 21, and integrally includes: a disc-shaped mirror plate 31; a spiral-shaped surround 32, which is composed of an involute shape or a curve that is approximately involute and is erected on the surface (one side) of the mirror plate 31; and a sleeve portion 33, which is protruded and formed at the center of the back side (the other side) of the mirror plate 31. The movable scroll 22 is configured so that the protruding direction of the surround 32 is set to the fixed scroll 21 side and the surround 32 is opposite to the surround 24 of the fixed scroll 21, so that they face each other and mesh with each other, and a pressure chamber 34 is formed between each surround 24, 32.

[0031] That is, the surround 32 of the movable scroll 22 is opposite to the surround 24 of the fixed scroll 21, and the front end of the surround 32 is in contact with the surface of the mirror plate 23, and the front end of the surround 24 is in contact with the surface of the mirror plate 31. The eccentric portion 36 is fitted on the sleeve portion 33 of the movable scroll 22, and the eccentric portion 36 is eccentrically provided from the axis at the other end of the drive shaft 14. Moreover, when the drive shaft 14 rotates together with the rotor 23 of the electric motor 2, the movable scroll 22 does not rotate on its own, but revolves and swirls relative to the fixed scroll 21.

[0032] Since the movable scroll 22 is eccentric to the fixed scroll 21 and revolves and swirls, the eccentric direction and contact position of each surround 24, 32 rotate and move, and the pressure chamber 34 that sucks the refrigerant from the suction portion 37 on the outside moves inward and gradually shrinks. As a result, the refrigerant is compressed and finally discharged from the discharge hole 26 in the center to the discharge chamber 27 via the discharge valve 28.

[0033] exist Figure 1In FIG. 4 , reference numeral 38 is a circular thrust plate. The thrust plate 38 is used to partition a back pressure chamber 39 and a suction portion 37 on the outside of the scroll compression mechanism 4, and is located on the outside of the sleeve portion 33 and sandwiched between the center casing 6 and the movable scroll 22. The back pressure chamber 39 is formed between the back side of the mirror plate 31 of the movable scroll 22 and the center casing 6. Reference numeral 41 is a seal member mounted on the back side of the mirror plate 31 of the movable scroll 22 and abutting against the thrust plate 38. The back pressure chamber 39 and the suction portion 37 are partitioned by the seal member 41 and the thrust plate 38.

[0034] In addition, reference numeral 48 denotes a centrifugal oil separator installed in the discharge chamber 27 of the rear housing 9 (housing 11). The oil separator 48 separates the lubricating oil mixed in the refrigerant discharged from the scroll compression mechanism 4 to the discharge chamber 27 from the refrigerant. An inlet 49 is formed in the oil separator 48, and the refrigerant containing oil flowing in from the inlet 49 swirls in the oil separator 48. The centrifugal force at this time separates the oil, and the refrigerant is discharged to the discharge pipe from the outflow port at the upper end toward the discharge port 20 as described above.

[0035] An oil storage chamber 44 is formed on the rear shell 9 below the oil separator 48, and the oil separated from the refrigerant by the oil separator 48 flows into the oil storage chamber 44 from the lower end of the oil separator 48. In the figure, the symbol 43 is a back pressure passage formed from the rear shell 9 to the center casing 6. The back pressure passage 43 is a path that connects the oil separator 48 in the discharge chamber 27 (discharge side of the scroll compression mechanism 4) in the rear shell 9 with the back pressure chamber 39, and has a throttle hole 50 in the embodiment. Thus, it is configured that the discharge pressure that is reduced and regulated by the throttle hole 50 of the back pressure passage 43 is supplied to the back pressure chamber 39 together with the oil in the oil storage chamber 44 separated by the oil separator 48.

[0036] The pressure (back pressure) in the back pressure chamber 39 generates a back pressure load that presses the movable scroll 22 against the fixed scroll 21. The back pressure load overcomes the compression reaction force of the pressure chamber 34 of the scroll compression mechanism 4 and presses the movable scroll 22 against the fixed scroll 21, maintaining the contact between the surrounds 24, 32 and the mirror plates 31, 23, and compressing the refrigerant through the pressure chamber 34.

[0037] On the other hand, the inverter case 8 is composed of a case body 10 constituting an inverter housing portion 13 housing the inverter 3 therein, and a cover member 15 closing an opening of one end surface of the case body 10. The cover member 15 is mounted on the case body 10 after the inverter 3 is housed in the inverter housing portion 13.

[0038] Next, refer to Figure 2 to Figure 16 , the structure of the inverter 3 and the surroundings of the electric compressor 1 of the embodiment will be described. Figure 2Hereinafter, the electric compressor 1 will be shown in a state where the inverter case 8 side is on the upper side. Figure 2 is a detailed cross-sectional view of the inverter housing 8 of the electric compressor 1, Figure 3 3 is a perspective view of the electric compressor 1. The inverter 3 of the embodiment is a circuit board 51 on which a control circuit is mounted, and a switching element 5 ( Figure 13 to Figure 15 In the embodiment, it is composed of IGBT), smoothing capacitor, etc.

[0039] Here, a sealing plate 52 is mounted on the end wall 7A (partition wall) of the stator housing 7 , and a conductive sealing pin 53 is mounted on the sealing plate 52 . Figure 2 The detailed structure of the sealing plate 52 is shown. In this case, three sealing pins 53 are installed corresponding to each phase (three phases) of the electric motor 2. One end side of each sealing pin 53 penetrates the end wall 7A into the motor chamber 12 and is connected to the coil of the stator 25 of the electric motor 2.

[0040] On the other hand, an opening 54 is formed on the bottom wall 10A of the shell body 10 of the inverter shell 8 corresponding to the end wall 7A of the stator shell 7. When the inverter shell 8 is installed on the end wall 7A of the stator shell 7, the sealing plate 52 and the sealing pin 53 are located in the opening 54 and face the inverter accommodating portion 13, and the other end side of each sealing pin 53 stands up in the inverter accommodating portion 13.

[0041] In addition, three metal press-fit terminals 56 called power baskets are mounted on the circuit substrate 51 at positions corresponding to the other end sides of the sealing pins 53, and the other end sides of the sealing pins 53 are inserted into the press-fit terminals 56 and press-fitted with the press-fit terminals 56. Thus, each sealing pin 53 is electrically connected to the circuit substrate 51.

[0042] Here, each press-fit terminal 56 is as follows Figure 6 The shape is as follows: the front ends of the six connected elastic metal plates are mutually narrowed into a basket shape, and as shown in FIG. Figure 4 or Figure 5 As shown, the sealing pin 53 is inserted into six mounting holes 57 formed in an annular shape on the circuit substrate 51 and installed. In addition, a through hole 58 for the sealing pin 53 to pass through is formed on the circuit substrate 51 at a position that is the center of each press-fit terminal 56 surrounded by the mounting holes 57. Each sealing pin 53 passes through the through hole 58, and its front end is pressed against the press-fit terminal 56.

[0043] The six mounting holes 57 and through holes 58 are arranged in three locations to match the number of press-fit terminals 56. Figure 4-5 ). In addition, two positions are formed on the circuit substrate 51 at positions corresponding to the positions between the adjacent press-fit terminals 56. Figures 4 to 6The slit 59 is shown. The slit 59 is provided in the circuit substrate 51 to ensure the insulation distance between the press-fit terminals 56 (seal pins 53).

[0044] Furthermore, in the embodiment, the insulating cover 61 of the present invention is installed by utilizing the two slits 59. The insulating cover 61 of the embodiment is formed of an insulating material such as a hard synthetic resin and has Figure 7 , Figure 8 The pair of insulating wall portions 62 and 63 shown in the figure and the connecting portion 64 connecting the upper portions of one end of these insulating wall portions 62 and 63 to each other. In addition, at the lower end of each insulating wall portion 62 and 63 on the side of the circuit substrate 51, a locking portion 66 protruding outward is formed. In addition, at the central portion of the other end of each insulating wall portion 62 and 63, a contact portion 67 is formed, which is in a shape that crosses obliquely with respect to the plane direction of the circuit substrate 51 in this embodiment. In this case, the contact portion 67 is inclined in a manner that the lower end side of each insulating wall portion 62 and 63 faces the one end side of the insulating wall portion 62 and 63.

[0045] When such an insulating cover 61 is installed, the lower end portions of the insulating wall portions 62 and 63 are inserted into the slits 59 of the circuit board 51 from the upper surface of the circuit board 51 (the surface on the side opposite to the bottom wall 10A of the case body 10). At this time, the engaging portions 66 engage with the lower surface of the circuit board 51 (the surface on the side of the bottom wall 10A) at the edge of the slits 59 by utilizing the elasticity of the insulating cover 61.

[0046] In this embodiment, the upper surface of each engaging portion 66 is as follows: Fig.11 In addition, as described above, the contact portion 67 is in a shape that crosses the circuit substrate 51 obliquely, so that it can be smoothly inserted into the slit 59. Fig.12 As shown, one end edge of each insulating wall portion 62, 63 (also referred to as abutment portion 62A, 63A here) is guided into an inclined shape of abutment portion 67, and abuts against the circuit substrate 51 at one end of the slit 59 in a surface manner. In the embodiment, the abutment portions 62A, 63A are in a shape orthogonal to the plane direction of the circuit substrate 51, and each abutment portion 62A, 63A is in surface contact with the circuit substrate 51. In this way, each abutment portion 62A, 63A of the insulating wall portions 62, 63 is in surface contact, and each abutment portion 67 abuts against the circuit substrate 51 at the other end of the slit 59, thereby preventing the insulating cover 61 from moving and stably fixing it by its elasticity.

[0047] In this way, the insulating cover 61 is fixed to the circuit substrate 51. In this state, the insulating cover 61 is mounted on the circuit substrate 51 in a form surrounding the central press-fit terminal 56, and the insulating wall portions 62 and 63 of the insulating cover 61 are inserted between the left and right press-fit terminals 56 and the central press-fit terminal 56 (between adjacent press-fit terminals 56), and are arranged in an upright manner ( Figures 9 to 11 ). As a result, the insulation distance between the adjacent press-fit terminals 56 (between the sealing pins 53 ) is lengthened by at least the distance from the surface of the insulating wall portions 62 , 63 of the insulating cover 61 .

[0048] Next, use Figure 3 , Figure 13 to Figure 16 The following describes the assembly procedure of the inverter housing 8 of the electric compressor 1. First, Fig.13 As shown by the blank arrows in the figure, the press-fit terminals 56 are installed on the mounting holes 57 of the circuit substrate 51, and the insulating cover 61 is installed in the slit 59 of the circuit substrate 51. Fig.14 As shown by the white arrows in the middle, the circuit board 51 to which the press-fit terminals 56 and the insulating cover 61 are attached is mounted on the case body 10 .

[0049] In addition, if Fig.13 As shown in FIG. 1 , the switching element 5 is arranged in advance on the end wall 7A of the stator housing 7 via the insulating member 30 (insulating sheet). Fig.15 As shown by the blank arrows in the figure, the housing body 10 with the circuit substrate 51 mounted thereon is fixed to the end wall 7A of the stator housing 7 by bolts. At this time, the sealing plate 52 and the sealing pins 53 are pressed into (press-fitted) the press-fit terminals 56 of the circuit substrate 51 from the opening 54 to the inside of the inverter housing 13.

[0050] In addition, at this time, if Figure 4 As shown, a terminal connection hole 68 for inserting the terminal 5A of the switching element 5 is pre-formed on the circuit substrate 51. When the shell body 10 is installed, each switching element 5 is also located in the opening 54 and faces the inverter accommodating portion 13. After the terminal 5A is inserted into the terminal connection hole 68, the switching element 5 is also electrically connected to the circuit substrate 51 by welding.

[0051] In this way, after the case body 10 of the inverter case 8 is mounted on the end wall 7A of the stator housing 7, as shown in FIG. Fig.16 As shown by the blank arrow in the figure, the cover member 15 is mounted on the shell body 10 by bolting. Figure 3 shown.

[0052] As described in detail above, in the present invention, since the insulating cover 61 is provided on the circuit substrate 51 in the form of being located between the plurality of press-fit terminals 56 provided on the circuit substrate 51 of the inverter 3, the insulation distance between the press-fit terminals 56 connecting the sealing pins 53 of the sealing plate 52 can be ensured with a relatively simple structure such as installing the insulating cover 61. Thus, it is possible to fully cope with the high voltage standardization of the electric compressor 1, and there is no need for a special connection terminal for connecting the sealing pins 54 and the press-fit terminals 56 as in the past.

[0053] In this case, in order to ensure the insulation distance in the plane direction relative to the circuit substrate 51, a slit 59 is formed on the circuit substrate 51 between the press-fit terminals 56, but in the embodiment, a snap-fit ​​portion 66 is provided on the insulating cover 61, and the snap-fit ​​portion 66 is inserted into the slit 59, and the insulating cover 61 is snap-fitted with the circuit substrate 51 by utilizing its own elasticity, so that no special design changes are required, and other components in the inverter housing 13 are not affected, and the insulating cover 61 can be easily fixed to the circuit substrate 51. As a result, it is also possible to achieve commonality with components of electric compressors of other specifications, and overall convenience is high.

[0054] In addition, in the embodiment, three press-fit terminals 56 are arranged on the circuit substrate 51, and a pair of insulating wall portions 62, 63 respectively located between adjacent press-fit terminals 56; and a connecting portion 64 connecting the insulating wall portions 62, 63 are formed on the insulating cover 61, so that the insulation distance between adjacent press-fit terminals 56 can be reliably and stably ensured with a simple structure.

[0055] In addition, in the embodiment, a snap-fit ​​portion 66 is formed on each insulating wall portion 62, 63, and a plurality of abutment portions 67, 62A, 63A are formed on each insulating wall portion 62, 63 for abutting against the circuit substrate 51 to prevent the insulating cover 61 from moving. Therefore, the insulating cover 61 can be stably mounted on the circuit substrate 51, which is particularly advantageous for the vehicle-mounted electric compressor 1 that is exposed to vibrations during driving.

[0056] Furthermore, in the embodiment, since the contact portion 67 is shaped to cross obliquely with respect to the plane direction of the circuit substrate 51 , it is easy to mount on the circuit substrate 51 , and the elasticity of the insulating cover 61 itself can stabilize the mounting state of the circuit substrate 51 .

[0057] In the embodiment, the contact portions 62A and 63A are shaped orthogonal to the planar direction of the circuit board 51 , so the contact portions 62A and 63A are in surface contact with the circuit board 51 by the guidance of the inclined contact portion 67 , thereby stabilizing the mounting state.

[0058] In addition, in the above-mentioned embodiment, the upper surface of each engaging portion 66 of the insulating cover 61 is in an obliquely inclined conical shape ( Fig.11 ), but not limited to this, it can also be Fig.17 As shown in FIG. 1 , the upper surface of the engaging portion 66 is shaped to extend outward at a right angle (step-difference shape). Fig.18 The engaging portion 66 is shown protruding inward.

[0059] In addition, in the above-mentioned embodiment, the contact portion 67 is in a shape that crosses obliquely with respect to the plane direction of the circuit substrate 51 ( Fig.12 ), but not limited to, such as Fig.19 As shown, it can also be a right-angle step shape. Fig.12 , Fig.19 The contact portions 62A and 63A may also be shaped to cross obliquely with respect to the plane direction of the circuit board 51. In this case, the contact portions 62A and 63A are inclined toward the other end of the insulating wall portions 62 and 63 as they are toward the lower end of each insulating wall portion 62 and 63.

[0060] In addition, if you want to further increase the insulation distance, Fig. 20 As shown, the height dimension of each insulating wall portion 62, 63 of the insulating cover 61 from the circuit board 51 can be increased. Thereby, the necessary insulating distance can be easily ensured.

[0061] In addition, in the embodiment, the structure of providing three sealing pins 53 and press-fit terminals 56 is described, but it is not limited to this. In the case where the number of phases of the electric motor 2 is more, more sealing pins and press-fit terminals will be provided accordingly. In addition, the specific shape of the insulating cover 61 and the like shown in the embodiment is not limited to this, and it is needless to say that it can be changed within the scope of the purpose of the present invention. Explanation of symbols

[0062] 1 electric compressor; 2 Electric motor (motor); 3. Inverter; 4 Scroll compression mechanism (compression mechanism); 7 stator housing; 7A end wall (dividing wall); 8 inverter housing; 11 housing; 12 Motor room; 13 inverter housing; 51 circuit substrate; 52 sealing plate; 53 Sealing pin; 56 press-fit terminals; 59 slits; 61 insulation cover; 62, 63 insulating wall portion; 64 connecting part; 66: a locking portion; 67, 62A, 63A abutment portion.

Claims

1. An electric compressor, include: A motor chamber having a motor built therein; an inverter housing having an inverter installed therein for supplying power to the motor; A sealing plate, which is arranged on the partition wall between the motor chamber and the inverter housing portion; and a plurality of press-fit terminals, which are arranged on the circuit substrate of the inverter, and the sealing pins of the sealing plate are connected to each press-fit terminal, characterized in that: An insulating cover is included which is located between the press-fit terminals and is arranged on the circuit substrate.

2. The electric compressor according to claim 1, characterized in that: comprising a slit formed on the circuit substrate between each of the press-fit terminals, The insulating cover has an engaging portion that is inserted into the slit and engages with the circuit board by elasticity, whereby the insulating cover is fixed to the circuit board.

3. The electric compressor according to claim 2, characterized in that: At least three press-fit terminals are provided on the circuit substrate, and The insulating cover includes: a pair of insulating wall portions respectively located between the adjacent press-fit terminals; and a connecting portion connecting the insulating wall portions.

4. The electric compressor according to claim 3, characterized in that: The engaging portion is formed on each of the insulating wall portions, and a plurality of contact portions are formed on each of the insulating wall portions. The contact portions contact the circuit board to prevent movement of the insulating cover.

5. The electric compressor according to claim 4, characterized in that: At least one of the contact portions has a shape that crosses obliquely with respect to the plane direction of the circuit substrate.

6. The electric compressor according to claim 4 or 5, characterized in that: At least one of the contact portions has a shape that is orthogonal to a planar direction of the circuit substrate.

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