Electric compressor

Abstract

To provide a motor compressor capable of inhibiting distortion of a substrate.SOLUTION: A first holder 70 is supported by a circuit board 60 and an inverter circuit 116 is mounted thereon. A second holder 80 is supported by the circuit board 60 and an electromagnetic coil L1 is mounted thereon. The inverter circuit 116 mounted on the first holder 70 generates a larger amount of heat than that of an electronic component 110 mounted on the second holder 80. A collar 72 is attached to the first holder 70. Another collar 86 is attached to the second holder 80. In a state in which a bolt does not fasten the first holder 70 to an inverter housing 42, the collar 72 is disposed spaced away from the inverter housing 42.SELECTED DRAWING: Figure 6

Description

[Technical Field]

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

[0002] Japanese Patent Application Laid-Open Publication No. 2012-122439 (Patent Document 1) describes a technology in which a power system unit including heat-generating elements such as an IGBT (Insulated Gate Bipolar Transistor) is fixed to a control board by leads, the control board is fixed to the installation surface of the main housing via bolts, the power system unit is pressed against the installation surface to exchange heat with the installation surface, and the heat generated in the power system unit is dissipated. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-122439 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology described in the above document, when the control board is fixed to the installation surface of the main body housing with bolts, the stress acting on the control board increases, which can cause an increase in distortion of the control board. This distortion can cause malfunctions in the electronic components mounted on the control board and can reduce the accuracy of durability evaluations in thermal tests.

[0005] The present disclosure proposes an electric compressor that can reliably dissipate heat generated by electronic components and suppress distortion of the board. [Means for solving the problem]

[0006] The present disclosure proposes the following electric compressor.

[0007] The electric compressor includes a compression unit that compresses a refrigerant, an electric motor that drives the compression unit, and a drive circuit assembly including a drive circuit that controls rotation of the electric motor. The drive circuit assembly includes a circuit board, multiple electronic components that configure the drive circuit, and first and second holders supported by the circuit board and carrying at least one of the multiple electronic components. The first holder includes a first hollow cylindrical member attached to the first holder. The second holder includes a second hollow cylindrical member attached to the second holder. A heat-generating component that generates more heat than the electronic components mounted on the second holder is mounted on the first holder. The electric compressor further includes a housing that houses the multiple electronic components and receives heat conduction from the heat-generating component, a first screw member that passes through the first hollow cylindrical member and fastens the first holder to the housing unit, and a second screw member that passes through the second hollow cylindrical member and fastens the second holder to the housing unit. When the second screw member fastens the second holder to the housing portion and the first screw member does not fasten the first holder to the housing portion, the first hollow cylindrical member is positioned away from the housing portion.

[0008] In the electric compressor, the second screw member may penetrate the circuit board.

[0009] In the above electric compressor, the first screw member does not have to penetrate the circuit board.

[0010] In the electric compressor, the circuit board may have a notch formed at a position facing the first hollow cylinder member.

[0011] In the above-mentioned electric compressor, the housing portion has a first contact surface that contacts the first hollow cylindrical member and a second contact surface that contacts the second hollow cylindrical member, the first contact surface having a first female threaded hole into which the first screw member is fastened, and the second contact surface having a second female threaded hole into which the second screw member is fastened, and the first contact surface and the second contact surface may be located on the same plane.

[0012] In the electric compressor, the first hollow cylindrical member may include a plurality of first hollow cylindrical members, and the heat-generating component may be disposed between the plurality of first hollow cylindrical members.

[0013] In the electric compressor, the plurality of first hollow cylindrical members may include three or more first hollow cylindrical members.

[0014] In the above electric compressor, the first holder has a third hollow cylindrical member attached to the first holder, and the third hollow cylindrical member may be in contact with the housing portion when the first screw member is not fastening the first holder and the housing portion.

[0015] In the electric compressor, the first holder may be provided with a precision positioning portion between the third hollow cylindrical member and the heat-generating component, the precision positioning portion requiring higher positioning accuracy than the heat-generating component. [Effects of the Invention]

[0016] According to the electric compressor of the present disclosure, heat generated by electronic components can be reliably dissipated, and distortion of the circuit board can be suppressed. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a partial cross-sectional view showing the overall configuration of an electric compressor according to an embodiment. [Figure 2] FIG. 2 is a schematic diagram of a drive circuit that drives an electric motor. [Figure 3] FIG. 2 is a schematic exploded perspective view of an inverter unit. [Figure 4] FIG. 2 is a schematic view of the drive circuit assembly as seen from below. [Figure 5] FIG. 2 is a schematic plan view of an inverter housing. [Figure 6] FIG. 2 is a cross-sectional view showing the inverter unit before being fastened with screws. [Figure 7] FIG. 10 is a cross-sectional view showing the inverter unit after the screws are fastened. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, the embodiments will be described with reference to the drawings. In the following description, the same parts and components are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated. It is also intended from the beginning that any configuration may be extracted from the embodiments and arbitrarily combined.

[0019] 1 is a partial cross-sectional view showing the overall configuration of an electric compressor 1 according to an embodiment. As shown in FIG. 1, the electric compressor 1 includes a housing 10, a compression section 20, an electric motor 30, and an inverter unit 40.

[0020] The housing 10 has a substantially cylindrical shape and accommodates the compression section 20 and the electric motor 30. An intake port 11a and a discharge port 11b are formed in the housing 10. An external refrigerant circuit (not shown) is connected to the intake port 11a and the discharge port 11b.

[0021] The external refrigerant circuit includes a heat exchanger, an expansion valve, etc., and supplies refrigerant to the electric compressor 1. Refrigerant is drawn from the external refrigerant circuit into the intake port 11a. The electric compressor 1 compresses the refrigerant supplied from the external refrigerant circuit. The refrigerant is discharged from the discharge port 11b into the external refrigerant circuit. The electric compressor 1 and the external refrigerant circuit constitute an air conditioning system that performs heating and cooling. The air conditioning system is installed in, for example, a vehicle and adjusts the temperature of the air in the vehicle cabin.

[0022] The compression unit 20 is configured to compress the refrigerant drawn in through the suction port 11a and discharge the compressed refrigerant from the discharge port 11b. The compression unit 20 may be of any type, such as a scroll type, a piston type, or a vane type.

[0023] The electric motor 30 is configured to drive the compression unit 20. The electric motor 30 includes, for example, a rotating shaft 31, a rotor 32, and a stator 33. The rotating shaft 31 is cylindrical and rotatably supported relative to the housing 10. The rotor 32 is cylindrical and fixed to the rotating shaft 31. The stator 33 is fixed to the housing 10. The rotor 32 and the stator 33 face each other in the radial direction of the rotating shaft 31. The stator 33 includes a cylindrical stator core 34 and a coil 35. The coil 35 is formed by winding a conducting wire around the teeth of the stator core 34. The electric motor 30 is an AC rotating electric machine, and may be, for example, an IPM (Interior Permanent Magnet) synchronous motor in which a permanent magnet is embedded in the rotor 32.

[0024] The inverter unit 40 includes an inverter cover 41. The inverter cover 41 is fixed to the housing 10. A hollow space is formed inside the inverter cover 41. A drive circuit for the electric motor 30 is housed in this hollow space.

[0025] Power controlled by the inverter unit 40 is supplied to the electric motor 30, causing the rotor 32 and the rotary shaft 31 to rotate at a controlled rotational speed. This rotation drives the compression section 20. As the compression section 20 is driven, refrigerant is drawn into the housing 10 from the external refrigerant circuit via the suction port 11a, the refrigerant drawn into the housing 10 is compressed by the compression section 20, and the compressed refrigerant is discharged into the external refrigerant circuit via the discharge port 11b.

[0026] 2 is a schematic configuration diagram of a drive circuit 100 that drives the electric motor 30. As shown in FIG. 2, the drive circuit 100 includes an electromagnetic coil L1, a capacitor circuit 114, an inverter circuit 116, and a control ECU (Electronic Control Unit) 120.

[0027] The electromagnetic coil L1 is connected between the positive electrode of the DC power supply B and a positive bus PL. The capacitor circuit 114 is connected between the positive bus PL and the negative bus NL. The electromagnetic coil L1 and the capacitor circuit 114 constitute a low-pass filter circuit 112.

[0028] Inverter circuit 116 includes a U-phase arm 117, a V-phase arm 118, and a W-phase arm 119. U-phase arm 117, V-phase arm 118, and W-phase arm 119 are each connected between a positive electrode bus PL and a negative electrode bus NL.

[0029] U-phase arm 117, V-phase arm 118, and W-phase arm 119 each have a switching element connected in series with one another. Each switching element is, for example, an IBGT or a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), which is an example of a power semiconductor.

[0030] The U-phase arm 117 is connected to one end of the U-phase coil of the stator 33 of the electric motor 30. The V-phase arm 118 is connected to one end of the V-phase coil of the stator 33 of the electric motor 30. The W-phase arm 119 is connected to one end of the W-phase coil of the stator 33 of the electric motor 30. The other ends of the U-phase coil, V-phase coil, and W-phase coil of the stator 33 of the electric motor 30 are connected to a neutral point.

[0031] A DC voltage from a DC power supply B is supplied to the inverter circuit 116 via relays RY1 and RY2 and a low-pass filter circuit 112. The DC voltage is converted into a three-phase AC voltage by controlling the switching of transistors included in a U-phase arm 117, a V-phase arm 118, and a W-phase arm 119. The converted AC voltage is supplied to the electric motor 30, thereby controlling the rotational drive of the electric motor 30.

[0032] The control ECU 120 includes a CPU (Central Processing Unit) and executes a computer program that controls the driving of the electric motor 30 .

[0033] Fig. 3 is a schematic exploded perspective view of the inverter unit 40. The inverter unit 40 includes a drive circuit assembly 101 shown in Fig. 3 and an inverter housing 42. Fig. 4 is a schematic view of the drive circuit assembly 101 as seen from below. Fig. 5 is a schematic plan view of the inverter housing 42.

[0034] The inverter housing 42 has a base surface 43 and a side wall portion 44. The base surface 43 has a generally flat shape. The side wall portion 44 protrudes from the peripheral edge of the base surface 43 generally perpendicular to the base surface 43. The base surface 43 and the side wall portion 44 form a container shape with a bottom. The inverter cover 41 described with reference to FIG. 1 is fixed to the side wall portion 44. A drive circuit assembly 101 is housed in the hollow space surrounded by the inverter cover 41 and the inverter housing 42. The inverter cover 41 and the inverter housing 42 form a drive circuit housing chamber that houses the drive circuit 100.

[0035] 1 may constitute inverter housing 42. Alternatively, inverter housing 42 may be formed as a separate member from housing 10 and may be fixed to housing 10 using, for example, bolts. Base surface 43 of inverter housing 42 functions as a partition wall that separates a motor housing chamber that houses electric motor 30 from a drive circuit housing chamber that houses drive circuit 100.

[0036] The inverter housing 42 has a heat dissipation surface 45 and a contact surface 46 on a part of the base surface 43. The inverter housing 42 has fastening portions 47 to 54. The fastening portions 47 to 54 protrude substantially perpendicularly from the base surface 43. Each of the fastening portions 47 to 54 has a hollow cylindrical shape, and the inner peripheral surface is internally threaded. Each of the fastening portions 47 to 54 has an internally threaded hole formed therein.

[0037] The drive circuit assembly 101 mainly includes a circuit board 60, a first holder 70, a second holder 80, and the drive circuit 100 shown in FIG.

[0038] The circuit board 60 supports a first holder 70 and a second holder 80. The first holder 70 and the second holder 80 are, for example, resin molded products. The first holder 70 and the second holder 80 each mount at least one electronic component 110 among the multiple electronic components 110 that make up the drive circuit 100 shown in FIG. 2. A wiring pattern is formed on the circuit board 60, and the electronic components 110 are electrically connected via the wiring pattern. A control ECU 120 (FIG. 2) may also be mounted on the circuit board 60.

[0039] As shown in Fig. 4, the first holder 70 is equipped with, for example, an inverter circuit 116. The second holder 80 is equipped with, for example, an electromagnetic coil L1 and a capacitor circuit 114. The second holder 80 is equipped with a low-pass filter circuit 112 (Fig. 2). The inverter circuit 116 equipped in the first holder 70 generates more heat than the electromagnetic coil L1 and the capacitor circuit 114 equipped in the second holder 80. The inverter circuit 116 corresponds to an example of a "heat-generating component," which is an electronic component 110 that generates more heat than the electronic component 110 equipped in the second holder 80.

[0040] A heat sink 79 is provided to cover the six switching elements that make up the inverter circuit 116. The heat sink 79 covers the entire inverter circuit 116. The inverter circuit 116 is sandwiched between the first holder 70 and the heat sink 79. The surface of the heat sink 79 shown in FIG. 4 has a flat shape. The back surface of the heat sink 79, which is opposite to the surface shown in FIG. 4, is in contact with each of the switching elements that make up the inverter circuit 116. The switching elements may be in direct surface contact with the back surface of the heat sink 79. Alternatively, another member made of a highly thermally conductive material may be interposed between the back surface of the heat sink 79 and the switching elements, so that the heat sink 79 and the switching elements are in thermal contact with each other.

[0041] Collars 71 to 74 are attached to the first holder 70. Collars 85 to 88 are attached to the second holder 80. The collars 71 to 74 and 85 to 88 have a hollow cylindrical shape. Typically, the collars 71 to 74 and 85 to 88 have a cylindrical shape. The collars 71 to 74 and 85 to 88 may be formed from a conductive material such as metal. In this case, it becomes possible to electrically connect the circuit board 60 to the first holder 70 and the second holder 80 via the collars 71 to 74 and 85 to 88, and to ground the circuit board 60.

[0042] The collars 71 to 74 and 85 to 88, which are metal parts, are molded as an integral structure with the first holder 70 and the second holder 80 by insert molding when the first holder 70 and the second holder 80 are molded.

[0043] As shown in FIG. 3, the circuit board 60 has a notch 61 cut out at a position opposite the collar 71, a notch 62 cut out at a position opposite the collar 72, and a notch 63 cut out at a position opposite the collar 73.

[0044] 3 passes through collar 71 and is fastened to fastening portion 47 of inverter housing 42. Bolt 92 passes through collar 72 and is fastened to fastening portion 48 (FIG. 5) of inverter housing 42. Bolt 93 passes through collar 73 and is fastened to fastening portion 49 (FIG. 5) of inverter housing 42. Bolt 94 passes through collar 74 (FIG. 4) and is fastened to fastening portion 54 (FIG. 5) of inverter housing 42.

[0045] The bolt 95 passes through the collar 85 (FIG. 4) and is fastened to the fastening portion 51 (FIG. 5) of the inverter housing 42. The bolt 96 passes through the collar 86 (FIG. 4) and is fastened to the fastening portion 52 of the inverter housing 42. The bolt 97 passes through the collar 87 (FIG. 4) and is fastened to the fastening portion 53 of the inverter housing 42. The bolt 98 passes through the collar 88 (FIG. 4) and is fastened to the fastening portion 50 (FIG. 5) of the inverter housing 42.

[0046] By fastening each of the bolts 91 to 98 to the corresponding fastening portions of the inverter housing 42, the circuit board 60, the first holder 70 and the second holder 80 supported by the circuit board 60, and the electronic components 110 mounted on the first holder 70 and the second holder 80 are attached to the inverter housing 42. In this state, the multiple electronic components 110 are accommodated in the inverter housing 42. The heat sink 79 is in surface contact with the heat dissipation surface 45 provided on the base surface 43. Heat is transferred from the inverter circuit 116 to the heat dissipation surface 45 via the heat sink 79.

[0047] The inverter housing 42 accommodates a plurality of electronic components 110 and receives heat conduction from the inverter circuit 116, which is a heat-generating component, and corresponds to an example of a "housing portion."

[0048] The bolts 94, 95 to 98 pass through the circuit board 60 and are fastened to the inverter housing 42. The bolts 91 to 93 do not pass through the circuit board 60 because the circuit board 60 is cut out around the collars 71 to 73.

[0049] The collars 71-73 attached to the first holder 70 correspond to an example of a "first hollow cylindrical member." The collars 85-88 attached to the second holder 80 correspond to an example of a "second hollow cylindrical member." The collar 74 attached to the first holder corresponds to an example of a "third hollow cylindrical member."

[0050] The bolts 91-93 that pass through the collars 71-73 and are fastened to the inverter housing 42 correspond to an example of a "first screw member." The bolts 95-98 that pass through the collars 85-88 and are fastened to the inverter housing 42 correspond to an example of a "second screw member." The bolt 94 that passes through the collar 74 and is fastened to the inverter housing 42 corresponds to an example of a "third screw member." The screw member is not limited to bolts, and may be a screw or the like.

[0051] 4, the inverter circuit 116, which is a heat-generating component, is disposed between the collar 71 and the collar 72, and between the collar 71 and the collar 73. The three collars 71, 72, and 73 are disposed around the inverter circuit 116 so as to surround the inverter circuit 116.

[0052] The first holder 70 further has a terminal portion 76 mounted thereon. The terminal portion 76 electrically connects the drive circuit 100 shown in FIG. 2 to the electric motor 30. Specifically, the terminal portion 76 has UVW three-phase terminals. A U-phase arm 117 is electrically connected to the U-phase coil of the electric motor 30 via the U-phase terminal of the terminal portion 76. A V-phase arm 118 is electrically connected to the V-phase coil of the electric motor 30 via the V-phase terminal of the terminal portion 76. A W-phase arm 119 is electrically connected to the W-phase coil of the electric motor 30 via the W-phase terminal of the terminal portion 76.

[0053] The three-phase terminals of the terminal portion 76 penetrate the base surface 43 of the inverter housing 42 and are arranged across the motor accommodating chamber that accommodates the electric motor 30 and the drive circuit accommodating chamber that accommodates the drive circuit 100. When the first holder 70 is attached to the inverter housing 42, a portion of the terminal portion 76 comes into close contact with a contact surface 46 provided on the base surface 43. The terminal portion 76 is fixed airtight to the contact surface 46, thereby ensuring the airtightness of the motor accommodating chamber. The terminal portion 76 is an airtight terminal that maintains airtightness between the motor accommodating chamber and the drive circuit accommodating chamber.

[0054] The terminal portion 76 is disposed between the collar 74 and the inverter circuit 116. The terminal portion 76 corresponds to an example of a "precise positioning portion" that requires higher positional accuracy than the inverter circuit 116.

[0055] Fig. 6 is a cross-sectional schematic diagram showing the inverter unit 40 before the screws are fastened. Fig. 6 and the following Fig. 7 show cross sections of the inverter housing 42 and the drive circuit assembly 101 placed on the inverter housing 42, taken along a predetermined folded line. The folded line passes through the collar 72, the inverter circuit 116, bends, passes through the electromagnetic coil L1, and then passes through the collar 86.

[0056] 6 electrically connects the wiring pattern formed on the circuit board 60 to the first holder 70. The first holder 70 is supported on the circuit board 60 via the bus bars 121 and 122. The leads 123 and 124 electrically connect the wiring pattern formed on the circuit board 60 to the inverter circuit 116. The leads 125 and 126 electrically connect the wiring pattern formed on the circuit board 60 to the electromagnetic coil L1.

[0057] The fastening portion 48 has a top surface 48s. The inner peripheral surface of a blind hole drilled from the top surface 48s into the fastening portion 48 is internally threaded to form an internally threaded hole. A bolt 92 is fastened into this internally threaded hole. The fastening portion 52 has a top surface 52s. The inner peripheral surface of a blind hole drilled from the top surface 52s into the fastening portion 52 is internally threaded to form an internally threaded hole. A bolt 96 is fastened into this internally threaded hole.

[0058] The top surface 48s of the fastening portion 48 comes into contact with the collar 72 when the bolt 92 is fastened to the fastening portion 48. The top surface 48s of the fastening portion 48 corresponds to an example of a "first contact surface." The female threaded hole formed in the fastening portion 48 corresponds to an example of a "first female threaded hole." The top surface 52s of the fastening portion 52 comes into contact with the collar 86. The top surface 52s of the fastening portion 52 corresponds to an example of a "second contact surface." The female threaded hole formed in the fastening portion 52 corresponds to an example of a "second female threaded hole."

[0059] 6, before the screws are tightened, the bolt 92 is not tightened to the fastening portion 48, and the bolt 96 is not tightened to the fastening portion 52. In this state, the collar 86 is in contact with the fastening portion 52. The collar 86 has an end face that abuts against the top surface 52s of the fastening portion 52. On the other hand, the collar 72 is disposed away from the fastening portion 48. A gap 56 is formed between the collar 72 and the top surface 48s of the fastening portion 48.

[0060] Top surface 48s of fastening portion 48 and top surface 52s of fastening portion 52 are located on the same plane. Collar 72 attached to first holder 70 and collar 86 attached to second holder 80 are arranged offset from each other in the fastening direction of bolts 92, 96 (the up-down direction in FIGS. 6 and 7). As a result, gap 56 is formed between top surface 48s of fastening portion 48 and collar 72, and a configuration is realized in which top surface 52s of fastening portion 52 and collar 86 come into contact with each other without any gap.

[0061] Fig. 7 is a cross-sectional view showing the inverter unit 40 after the screws have been tightened. The bolt 96 penetrates the circuit board 60 and the collar 86, and is then tightened to the fastening portion 52. Even before the screws are tightened as shown in Fig. 6, the collar 86 is in contact with the top surface 52s of the fastening portion 52, and therefore the positions of the second holder 80 and the electromagnetic coil L1 relative to the inverter housing 42 remain substantially unchanged even after the bolt 96 is tightened.

[0062] The bolt 92 does not penetrate the circuit board 60. The bolt 92 passes through a notch 62 formed in the circuit board 60, penetrates the collar 72, and is fastened to the fastening portion 48. Before the screw is fastened as shown in FIG. 6, a gap 56 is formed between the top surface 48s of the fastening portion 48 and the collar 72. When the bolt 92 is fastened, the collar 72 moves toward the fastening portion 48, and as shown in FIG. 7, the collar 72 comes into contact with the top surface 48s of the fastening portion 48.

[0063] At this time, at least a portion of the first holder 70 is displaced toward the inverter housing 42. The entire first holder 70 may be displaced, but by bending the first holder 70 as shown in Fig. 7, only a portion of the first holder 70 can be displaced. The rigidity of the first holder 70 may be made smaller than the rigidity of the second holder 80, so that the first holder 70 can be easily bent.

[0064] As the first holder 70 is displaced, the heat sink 79 is pressed against the heat dissipation surface 45 of the inverter housing 42. This promotes thermal conduction of heat generated in the inverter circuit 116 to the inverter housing 42 via the heat sink 79 and the heat dissipation surface 45. As described with reference to FIG. 1, refrigerant is drawn into the housing 10 through the intake port 11a. The low-temperature, low-pressure refrigerant flows near the inverter housing 42, cooling the inverter housing 42. In this way, the heat generated by the inverter circuit 116, which generates a large amount of heat, can be reliably dissipated.

[0065] The bolt 96 fastens the circuit board 60 and the second holder 80 together. The collar 86 is already in contact with the fastening portion 52 before the bolt 96 is fastened. On the other hand, the collar 72 is positioned away from the fastening portion 48 before the bolt 92 is fastened, and comes into contact with the fastening portion 48 when the bolt 92 is fastened. The collar 72 is positioned away from the circuit board 60. When the bolt 92 is fastened, the stress transmitted to the circuit board 60 is reduced. This makes it possible to suppress distortion of the circuit board 60.

[0066] As shown in FIGS. 3 and 7, the bolts 95 to 98 pass through the circuit board 60 and are fastened to the inverter housing 42, so that the circuit board 60 and the second holder 80 can be securely fastened together by the bolts 95 to 98.

[0067] As shown in FIGS. 3 and 7, the bolts 91 to 93 do not penetrate the circuit board 60, so that the stress transmitted to the circuit board 60 when the bolts 91 to 93 are fastened can be reliably reduced.

[0068] As shown in FIG. 3, by forming the notches 61 to 63 in the circuit board 60, it is possible to reliably realize a configuration in which the bolts 91 to 93 do not penetrate the circuit board 60.

[0069] As shown in FIGS. 6 and 7, the top surface 48s of the fastening portion 48 and the top surface 52s of the fastening portion 52 are flush with each other, which facilitates cutting of the inverter housing 42 and improves productivity.

[0070] As shown in FIG. 4, the inverter circuit 116 is disposed between the collar 71 and the collar 73, and by fastening the bolts 91 and 93, the inverter circuit 116 can be pressed toward the heat dissipation surface 45, thereby promoting heat dissipation from the inverter circuit 116 to the heat dissipation surface 45.

[0071] As shown in FIG. 4, three collars 71, 72, and 73 are arranged to surround the inverter circuit 116, and by tightening the bolts 91 to 93, the inverter circuit 116 can be pressed toward the heat dissipation surface 45, thereby further promoting heat dissipation from the inverter circuit 116 to the heat dissipation surface 45.

[0072] 3 and 4, the arrangement of collar 74 attached to first holder 70 is different from the arrangement of the other collars 71 to 73. No notch is formed in the circuit board 60 at a position facing collar 74. Bolt 94, which passes through collar 74 and is fastened to fastening portion 54 of inverter housing 42, also passes through circuit board 60. Like collars 85 to 88 attached to second holder 80, collar 74 comes into contact with inverter housing 42 (the top surface of fastening portion 54) when bolt 94 is not fastened.

[0073] A terminal portion 76 is disposed near the collar 74. The first holder 70 has the terminal portion 76 mounted between the collar 74 and the inverter circuit 116. The terminal portion 76 has an airtight terminal and requires higher positional accuracy than the inverter circuit 116. The positional accuracy of the terminal portion 76 can be improved by bringing the collar 74 into contact with the top surface of the fastening portion 54 and positioning the collar 74 relative to the inverter housing 42. A configuration can be realized in which the airtight terminal of the terminal portion 76 can reliably maintain the airtightness of the motor accommodating chamber.

[0074] In the description of the embodiment, an example has been described in which the collar 72 and the collar 86 are offset from each other to bring the collar 86 into contact with the top surface 52s of the fastening portion 52, thereby forming a gap 56 between the collar 72 and the top surface 48s of the fastening portion 48. In this case, the collars 71 to 74 and 85 to 88 can be formed from the same component, thereby reducing costs through component standardization. Alternatively, the length of the collar 72 may be made shorter than the length of the collar 86, thereby forming the gap 56 between the collar 72 and the fastening portion 48 when the bolt 92 is not fastened. Alternatively, the height of the fastening portion 48 of the inverter housing 42 may be made shorter than the height of the fastening portion 52, thereby offsetting the position of the top surface of the fastening portion, thereby forming the gap 56 between the collar 72 and the fastening portion 48.

[0075] In the description of the embodiment, an example has been described in which the heat sink 79 is interposed between the inverter circuit 116 and the heat dissipation surface 45 of the inverter housing 42, and heat generated by the inverter circuit 116 is transferred to the inverter housing 42 via the heat sink 79. The heat sink 79 does not necessarily have to be provided. A configuration may also be adopted in which all of the multiple switching elements included in the inverter circuit 116 are in surface contact with the heat dissipation surface 45, and heat is transferred directly from the inverter circuit 116 to the inverter housing 42.

[0076] This specification also includes the following inventions.

[0077] (Appendix 1) a compression section that compresses a refrigerant; an electric motor that drives the compression unit; a drive circuit assembly including a drive circuit that controls rotation of the electric motor, The drive circuit assembly includes: A circuit board; a plurality of electronic components that constitute the drive circuit; a first holder and a second holder supported by the circuit board and carrying at least one electronic component among the plurality of electronic components; the first holder has a first hollow cylindrical member attached to the first holder; the second holder has a second hollow cylindrical member attached to the second holder; a heat-generating component that is an electronic component that generates more heat than an electronic component mounted on the second holder is mounted on the first holder, the electric compressor further includes a housing portion that houses the plurality of electronic components and receives heat conducted from the heat-generating components; a first screw member that passes through the first hollow cylindrical member and fastens the first holder to the housing portion; a second screw member that passes through the second hollow cylindrical member and fastens the second holder to the housing portion, an electric compressor, wherein when the second screw member fastens the second holder and the housing portion and the first screw member does not fasten the first holder and the housing portion, the first hollow cylindrical member is positioned away from the housing portion.

[0078] (Appendix 2) 2. The electric compressor according to claim 1, wherein the second screw member penetrates the circuit board.

[0079] (Appendix 3) 3. The electric compressor according to claim 2, wherein the first screw member does not penetrate the circuit board.

[0080] (Appendix 4) 4. The electric compressor according to claim 3, wherein the circuit board has a notch formed at a position facing the first hollow cylinder member.

[0081] (Appendix 5) the housing portion has a first contact surface that contacts the first hollow cylindrical member and a second contact surface that contacts the second hollow cylindrical member, a first female screw hole into which the first screw member is fastened is formed in the first contact surface; a second female screw hole into which the second screw member is fastened is formed in the second contact surface, 5. The electric compressor according to claim 1, wherein the first contact surface and the second contact surface are located on the same plane.

[0082] (Appendix 6) the first hollow cylindrical member has a plurality of first hollow cylindrical members, 6. The electric compressor according to claim 1, wherein the heat-generating component is disposed between the plurality of first hollow cylindrical members.

[0083] (Appendix 7) 7. The electric compressor according to claim 6, wherein the plurality of first hollow cylindrical members include three or more first hollow cylindrical members.

[0084] (Appendix 8) the first holder has a third hollow cylindrical member attached to the first holder; The electric compressor according to any one of appendixes 1 to 7, wherein the third hollow tubular member contacts the housing portion when the first screw member is not fastening the first holder and the housing portion.

[0085] (Appendix 9) 9. The electric compressor according to claim 8, wherein the first holder is provided with a precision positioning part between the third hollow cylindrical member and the heat-generating component, the precision positioning part requiring higher positioning accuracy than the heat-generating component.

[0086] Although the embodiments have been described above, the embodiments disclosed herein are illustrative in all respects and should not be considered to be limiting. The scope of the present invention is defined by the claims, not by the above description, and is intended to include meanings equivalent to the claims and all modifications within the scope of the claims. [Explanation of symbols]

[0087] 1 electric compressor, 10 housing, 11a suction port, 20 compression section, 30 electric motor, 40 inverter unit, 42 inverter housing, 43 base surface, 44 side wall portion, 45 heat dissipation surface, 46 contact surface, 47-54 fastening portion, 48s, 52s top surface, 56 gap, 60 circuit board, 61-63 notch portion, 70 first holder, 71-74, 85-88 collar, 76 terminal portion, 79 heat sink, 80 second holder, 91-98 voltage, 100 drive circuit, 101 drive circuit assembly, 110 electronic components, 116 inverter circuit.

Claims

1. a compression section that compresses a refrigerant; an electric motor that drives the compression unit; a drive circuit assembly including a drive circuit that controls rotation of the electric motor, The drive circuit assembly includes: A circuit board; a plurality of electronic components that constitute the drive circuit; a first holder and a second holder supported by the circuit board and carrying at least one electronic component among the plurality of electronic components; the first holder has a first hollow cylindrical member attached to the first holder; the second holder has a second hollow cylindrical member attached to the second holder; a heat-generating component that is an electronic component that generates more heat than the electronic component mounted on the second holder is mounted on the first holder, the electric compressor further includes a housing portion that houses the plurality of electronic components and receives heat conducted from the heat-generating components; a first screw member that passes through the first hollow cylindrical member and fastens the first holder to the housing portion; a second screw member that passes through the second hollow cylindrical member and fastens the second holder to the housing portion, an electric compressor, wherein when the second screw member fastens the second holder and the housing portion, and when the first screw member does not fasten the first holder and the housing portion, the first hollow cylindrical member is positioned away from the housing portion.

2. The electric compressor according to claim 1 , wherein the second screw member penetrates the circuit board.

3. The electric compressor according to claim 2 , wherein the first screw member does not penetrate the circuit board.

4. The electric compressor according to claim 3 , wherein the circuit board has a notch formed at a position facing the first hollow cylindrical member.

5. the housing portion has a first contact surface that contacts the first hollow cylindrical member and a second contact surface that contacts the second hollow cylindrical member, a first female screw hole into which the first screw member is fastened is formed in the first contact surface; a second female screw hole into which the second screw member is fastened is formed in the second contact surface, The electric compressor according to claim 1 , wherein the first contact surface and the second contact surface are located on the same plane.

6. the first hollow cylindrical member has a plurality of first hollow cylindrical members, The electric compressor according to claim 1 , wherein the heat-generating component is disposed between the plurality of first hollow cylindrical members.

7. The electric compressor according to claim 6 , wherein the plurality of first hollow cylindrical members include three or more first hollow cylindrical members.

8. the first holder has a third hollow cylindrical member attached to the first holder; The electric compressor according to claim 1 , wherein the third hollow tubular member is in contact with the housing portion when the first screw member is not fastening the first holder and the housing portion together.

9. 9. The electric compressor according to claim 8, wherein the first holder is provided with a precision positioning portion between the third hollow cylindrical member and the heat-generating component, the precision positioning portion requiring higher positional accuracy than the heat-generating component.

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