Electric compressor and method for manufacturing same

Abstract

[Problem] To provide an electric compressor in which a switching element can be stably pressed and fixed to a heat sink. Technical means: An electric compressor (1) comprising an inverter (3) which has a switching element (5) and supplies power to an electric motor, the electric compressor (1) comprising: a stator housing (7) as a housing (11) of a heat sink; and fixing members (71, 72) that fix the switching element (5) to an end wall (7A) of the stator housing (7), the fixing members (71, 72) being configured from a coil spring (76) that comes into contact with the switching element (5), and covers (73, 74) that compress the coil spring (76) and press the switching element (5) against the end wall (7A) of the stator housing (7).

Description

Technical Field

[0001] The present invention relates to an electric compressor including an inverter having a switching element and supplying power to a motor, and a method for manufacturing the same. Background Art

[0002] For example, as a refrigerant compressor used in an air conditioner of an electric vehicle, an inverter-integrated electric compressor having an inverter in a housing is used. In this case, a motor chamber for accommodating a motor and an inverter accommodating portion for accommodating the inverter separated from the motor chamber are formed in the housing of the electric compressor.

[0003] Moreover, the switching elements of the inverter (IGBT, etc.) are arranged on the partition wall between the motor room and the inverter housing, and the partition wall is used as a heat sink. For example, the structure shown in patent document 1 is adopted: a leaf spring is pressed against the partition wall (heat sink), so that the switching element is fixed to the partition wall, and cooled by the low-temperature refrigerant flowing on the motor room side of the partition wall (refer to patent document 1). Prior art literature Patent Literature

[0004] Patent Document 1: Japanese Patent No. 5644706 Summary of the invention Technical problem to be solved by the invention

[0005] Here, in the electric compressor, the load for pressing the switch element such as IGBT against the partition wall (heat sink) is preferably 400 N or more. However, in the conventional structure of pressing with a leaf spring, since the stress generated when pressing the switch element with 400 N exceeds the tensile stress of the leaf spring material itself, the switch element is actually fixed with a load of less than 400 N. Therefore, the fixing of the switch element becomes unstable, sufficient cooling cannot be ensured, and there is a risk of positional displacement.

[0006] The present invention is made to solve the problems of the prior art, and its object is to provide an electric compressor and a manufacturing method thereof, which can stably press and fix a switching element to a radiator. Technical solutions adopted to solve technical problems

[0007] The electric compressor of the present invention includes an inverter having a switching element and supplying power to a motor, and is characterized in that it includes a radiator and a fixing member for fixing the switching element to the radiator, the fixing member being composed of a disc spring and a cover, the disc spring abutting against the switching element, and the cover compressing the disc spring to press the switching element against the radiator.

[0008] The electric compressor according to claim 2 of the invention is characterized in that, in the above invention, the radiator is a housing in which the motor is built.

[0009] The electric compressor according to the invention of claim 3 is characterized in that, in the invention of claim 1 , the cover has a pressing portion for pressing the switching element toward the radiator, and a holding portion for holding the spiral spring is formed on the pressing portion.

[0010] The electric compressor of the invention according to claim 4 is characterized in that, in the above invention, a plurality of switch elements are provided, the spiral springs are arranged respectively for the respective switch elements, and a plurality of holding portions for respectively holding the spiral springs are formed on the pressing portion of the cover.

[0011] The electric compressor of the invention according to claim 5 is characterized in that, in the above invention, the switching elements are arranged in a plurality of rows, and a plurality of fixing members are provided corresponding to each row of the switching elements.

[0012] The electric compressor according to the invention of claim 6 is characterized in that, in the invention of claim 1 , a plurality of disc springs are stacked.

[0013] The method for manufacturing an electric compressor according to claim 7 is characterized in that, in each of the above inventions, a plurality of spiral springs are stacked, and the number of spiral springs is changed to adjust the load pressing the switching element against the heat sink. Effects of the Invention

[0014] According to the present invention, in an electric compressor including an inverter having a switching element and supplying power to a motor, a radiator and a fixing member for fixing the switching element to the radiator are included, the fixing member being composed of a disc spring and a cover, the disc spring abutting against the switching element, the cover compressing the disc spring and pressing the switching element against the radiator, thereby being able to suppress the stress generated when the switching element is pressed with a required pressing force, for example, the necessary 400N.

[0015] Thus, the switching element can be pressed and fixed to the heat sink with a desired stress, the fixing force of the switching element is improved, and the switching element can be stably mounted on the heat sink.

[0016] In this case, as in the invention according to claim 2, the radiator in the electric compressor becomes a housing in which the motor is built.

[0017] Specifically, as in the invention of claim 3, the cover is provided with a pressing portion for pressing the switch element toward the heat sink, and the holding portion for holding the spiral spring is formed on the pressing portion.

[0018] Furthermore, although a plurality of switch elements are provided, as in the invention of claim 4, by preparing a coil spring for each switch element and forming a plurality of holding portions for holding each coil spring on the pressing portion of the cover, each switch element can be stably pressed and fixed to the heat sink.

[0019] In this case, as in the invention of claim 5 , when the switch elements are arranged in a plurality of rows, a plurality of fixing members are provided corresponding to the rows of the switch elements, so that the switch elements in each row can be pressed and fixed stably.

[0020] Furthermore, if a plurality of spiral springs are stacked as in the invention of claim 6, the load pressing the switch element against the heat sink can be adjusted by changing the number of spiral springs as in the invention of claim 7, thereby increasing versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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 yes Figure 1 An enlarged cross-sectional view of a switching element portion of an electric compressor. Figure 5 yes Figure 1 An exploded perspective view of a fixing component of an electric compressor. Figure 6 Observed from the bottom Figure 1 A three-dimensional diagram of an electric compressor. Figure 7 When the fixing components are installed, the Figure 1 A three-dimensional diagram of the shell body of the electric compressor. Figure 8 Yes Figure 1 A diagram illustrating press fixing of a switching element by a fixing member of an electric compressor. Fig. 9 yes Figure 3 Exploded perspective view of an electric compressor. Fig.10 yes Figure 3 Another exploded perspective view of the electric compressor. Fig.11 yes Figure 3 Another exploded perspective view of the electric compressor. Fig.12 It is a diagram for explaining another embodiment of the fixing member. Fig.13 This is a diagram for explaining the stacking of spiral springs. DETAILED DESCRIPTION

[0022] 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 according to one embodiment of the present invention.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] exist Figure 1 In 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] On the other hand, the inverter case 8 is composed of a case body 10, the case body 10 constituting an inverter housing portion 13 inside, and a cover member 15 closing an opening of one end surface of the case body 10. A circuit substrate 51 of the inverter 3, which will be described later, is housed in the inverter housing portion 13, and the cover member 15 is attached to the case body 10 after the inverter 3 is housed in the inverter housing portion 13.

[0040] Next, refer to Figure 2 to Figure 8 , the detailed structure of the inverter 3 and the surroundings of the electric compressor 1 of the embodiment will be described. Figure 2 Hereinafter, 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 is a perspective view of the electric compressor 1, Figure 4 It is an enlarged cross-sectional view of the switching element 5. The inverter 3 of the embodiment is configured by mounting a control circuit on a circuit board 51, and connecting the switching elements 5 (six IGBTs in the embodiment), a smoothing capacitor, and the like.

[0041] 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. In this case, Fig. 9 , Fig.10 As shown, three seal pins 53 are installed corresponding to each phase (three phases) of the electric motor 2. One end of each seal 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.

[0042] 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 housing 13, and the other end side of each sealing pin 53 is shaped to stand up in the inverter housing 13.

[0043] 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.

[0044] On the other hand, the switching element 5 is arranged on the surface of the outer side (the side opposite to the motor chamber 12) of the end wall 7A of the stator housing 7 in a heat exchange relationship with the end wall 7A via the insulating member 30 (insulating sheet). Thus, each switching element 5 is cooled by the refrigerant sucked into the motor chamber 12 via the end wall 7A. That is, in this embodiment, the stator housing 7 (end wall 7A) constituting the housing 11 serves as a heat sink for the switching element 5.

[0045] Here, in the embodiment, six switch elements 5 are arranged in two rows of three each. Each switch element 5 has three terminals 5A, and the terminals 5A stand from each switch element 5 in a direction away from the end wall 7A.

[0046] When the inverter housing 8 is mounted on the end wall 7A of the stator housing 7, each switching element 5 is located in the opening 54 and faces the inverter housing 13, and the terminal 5A of each switching element 5 is in a state of standing in the inverter housing 13. In addition, terminal connection holes 68 are formed on the circuit substrate 51 at positions corresponding to the terminals 5A, and the terminals 5A are inserted into the terminal connection holes 68. Moreover, the terminals 5A of each switching element 5 are electrically connected to the circuit substrate 51.

[0047] In the drawings, reference numerals 71 and 72 denote fixing members for fixing the switching elements 5 to the end wall 7A of the stator housing 7. The fixing members 71 and 72 of the embodiment are formed by covers 73 and 74 ( Figure 2 , Figure 4 ) and annular disc spring 76 ( Figure 5 , Figure 6 ) is composed of the covers 73 and 74, which are composed of metal plates. The disc spring 76 is compressed by the covers 73 and 74 to press the switching elements 5 against the end wall 7A of the stator housing 7.

[0048] In this case, the cover 73 of the fixing member 71 is as follows Figure 5 and Figure 6 The plate shown in FIG. 1 has a fixing portion 77 formed at one end in the short side direction and a pressing portion 78 formed at the other end. On the pressing portion 78, three cylindrical holding portions 79 for holding the coil spring 76 are protruded and formed. Figure 5 As shown by the middle arrow, each retaining portion 79 is respectively fitted into the circular hole in the center of the three coil springs 76, so that each coil spring 76 is installed and retained in each retaining portion 79 ( Figure 6 ).

[0049] In addition, the fixing portion 77 is screwed to the bottom wall 10A of the case body 10 near the opening 54, and the fixing member 71 is fixed to the bottom wall 10A of the case body 10, with the disc spring 76 facing the opening 54. In this state, the other end side of the cover 73 extends toward the opening 54, and the three disc springs 76 mounted on the holding portion 79 of the pressing portion 78 correspond to one row ( Figure 4 The three switch elements 5 of the upper row of the switch element 5 are pressed against the end wall 7A ( Figure 4 ).

[0050] The cover 74 of the fixing member 72 is as follows Figure 8 The long plate shown in the figure has a fixing portion 81 formed at one end in the longitudinal direction, and a pressing portion 82 formed from the one end to the other end. The pressing portion 82 has three cylindrical retaining portions 83 ( Figure 8 ), each retaining portion 83 is respectively embedded in the circular hole in the center of the three coil springs 76, and each coil spring 76 is installed and retained in each retaining portion 83.

[0051] In addition, the fixing portion 81 is screwed to the bottom wall 10A of the case body 10 near the opening 54, and the fixing member 72 is fixed to the bottom wall 10A of the case body 10, with the disc spring 76 facing the opening 54. In this state, the other end side of the cover 74 is extended toward the opening 54, and the three disc springs 76 mounted on the holding portion 83 of the pressing portion 82 correspond to the other row ( Figure 4 The three switch elements 5 in the left-facing row are pressed against the end wall 7A ( Figure 4 ).

[0052] Figure 7 A perspective view of the case body 10 with the fixing members 71 and 72 installed as described above is shown as viewed from below. As shown in the figure, the covers 73 and 74 of the fixing members 71 and 72 extend from the bottom wall 10A of the case body 10 toward the opening 54, and the coil springs 76 installed in these retaining portions 78 and 83 are shaped so that three of each can be seen from the opening 54.

[0053] Next, refer to Figures 9 to 11 , the assembly sequence of the electric compressor 1 when assembling the inverter 3 is described. The terminal connection holes 68 are formed on the circuit substrate 51, and the press-fit terminals 56 are also installed. In addition, the opening 54 is formed so that when the inverter case 8 is mounted on the stator housing 7, the sealing plate 52 is located in the opening 54.

[0054] First, the fixing members 71 and 72 to which the coil springs 76 are attached are attached to the bottom wall 10A of the case body 10 as described above, and the covers 73 and 74 are extended toward the opening 54 ( Figure 7 ). Then, if Fig. 9 As shown by the blank arrows in the middle, the circuit board 51 is mounted on the case body 10. When the inverter case 8 is mounted on the stator housing 7, the switching elements 5 are arranged in two rows on the end wall 7A located in the opening 54 as described above.

[0055] Then, if Fig.10 As shown by the blank arrows in the figure, the housing body 10 to which the fixing members 71, 72 and the circuit substrate 51 are mounted is fixed to the end wall 7A of the stator housing 7 by bolts. At this time, the switching elements 5 face the inverter accommodating portion 13 from the opening 54, and the disc springs 76 of the fixing members 71, 72 are respectively in contact with the switching elements 5. Moreover, the disc springs 76 are compressed by the covers 73, 74, and the switching elements 5 are pressed and fixed to the end wall 7A of the stator housing 7.

[0056] In addition, the terminals 5A of the switching elements 5 are respectively inserted into the terminal connection holes 68 of the circuit substrate 51. Moreover, in the embodiment, the terminals 5A are electrically connected to the circuit substrate 51 by welding. In addition, the sealing plate 52 and the sealing pins 53 also face the inside of the inverter accommodating portion 13 from the opening 54, and the sealing pins 53 are pressed (press-fitted) into the press-fit terminals 56 of the circuit substrate 51 and electrically connected to the circuit substrate 51. That is, the sealing pins 53 are electrically connected to the circuit substrate 51 by press-fitting.

[0057] 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.11 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.

[0058] As described in detail above, in the present invention, fixing components 71, 72 are provided for fixing the switch element 5 to the end wall 7A of the stator housing 7 (heat sink), and the fixing components 71, 72 are composed of a disc spring 76 and covers 73, 74. The disc spring 76 abuts against the switch element 5, and the covers 73, 74 compress the disc spring 76 and press the switch element 5 against the end wall 7A. Therefore, the stress generated when the switch element 5 is pressed with the required pressing force, i.e., 400N, can be suppressed to a lower level.

[0059] Thus, the switch element 5 can be pressed and fixed to the end wall 7A with a desired stress, the fixing force of the switch element 5 is improved, and the switch element 5 can be stably attached to the end wall 7A.

[0060] In the embodiment, a coil spring 76 is prepared for each switch element 5, and a plurality of holding portions 79, 83 for holding each coil spring 76 are formed on the pressing portions 78, 82 of the covers 73, 74. Therefore, each switch element 5 can be stably pressed and fixed to the end wall 7A.

[0061] In this case, in the embodiment, a plurality of fixing members 71 and 72 are provided corresponding to the respective columns of the switch elements 5 , and therefore, the switch elements 5 in each column can be pressed and fixed stably.

[0062] then, Fig.12 Another embodiment of the fixing members 71 and 72 is shown. Figure 8 Components indicated by the same reference numerals are the same components or have the same functions. In the above-mentioned embodiment, two (or more) fixing components 71, 72 are installed corresponding to the switch elements 5 of each column, but in this embodiment, Fig.12 As shown, one fixing member 70 integrally provided with a portion 71A and a portion 72A is used, the portion 71A corresponds to the fixing member 71 , and the portion 72A corresponds to the fixing member 72 .

[0063] In this case, the cover 73 of the portion 71A and the cover 74 of the portion 72A are connected to avoid the switching element 5. Thus, by using the integrated fixing member 70, the number of components can be reduced.

[0064] Furthermore, in the embodiment, a single disc spring 76 is used to press the switch element 5 . Fig.13 (a) shows the cross section of the one-piece coil spring 76. However, in the case where the load pressed by the one-piece coil spring 76 is insufficient, for example, Fig.13 As shown in (b) or (c), two sheets are stacked and used. When a larger load is required, the number of stacked sheets is further increased.

[0065] By stacking a plurality of disc springs 76 in this manner, the load pressing the switching element 5 against the end wall 7A of the stator case 7 (heat sink) can be adjusted by changing the number of disc springs 76, thereby increasing versatility.

[0066] In addition, the specific shapes of the components shown in the embodiments are not limited to these, and can be changed within the scope not departing from the gist of the present invention. Explanation of symbols

[0067] 1 electric compressor; 2 Electric motor (motor); 3. Inverter; 4 Scroll compression mechanism (compression mechanism); 5. Switching elements; 5A terminal; 7. stator housing (radiator); 7A end wall (dividing wall); 8 Inverter housing; 10 Shell body; 10A bottom wall; 11 housing (heat sink); 12 Motor room; 13 inverter housing; 51 circuit substrate; 54 opening; 68 terminal connection holes; 70, 71, 72 fixing components; 73, 74 hood; 76 coil spring; 78, 82 pressing part; 79, 83 holding part.

Claims

1. An electric compressor, comprising an inverter having a switching element and supplying power to a motor, characterized in that: The electric compressor includes: Radiator; and A fixing member for fixing the switching element to the heat sink, The fixing member is composed of a coil spring and a cover, and the coil spring abuts against the switch element. The cover compresses the coil spring to press the switch element against the heat sink.

2. The electric compressor according to claim 1, characterized in that: The radiator is a housing in which the motor is built.

3. The electric compressor according to claim 1, characterized in that: The cover has a pressing portion for pressing the switch element toward the heat sink. The pressing portion is formed with a holding portion that holds the coil spring.

4. The electric compressor according to claim 3, characterized in that: The switch element is provided with a plurality of The coil springs are respectively arranged relative to the switch elements, and The pressing portion of the cover is formed with a plurality of holding portions that respectively hold the coil springs.

5. The electric compressor according to claim 4, characterized in that: The switch elements are arranged in a plurality of columns, and A plurality of the fixing members are provided corresponding to each column of the switching elements.

6. The electric compressor according to claim 1, characterized in that: A plurality of the coil springs are stacked.

7. A method for manufacturing an electric compressor, characterized in that: A method for manufacturing an electric compressor according to any one of claims 1 to 6, A plurality of spiral springs are stacked and the number of spiral springs is changed to adjust the load pressing the switching element against the heat sink.

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