WO2023162547A1

WO2023162547A1 - Electric compressor

Info

Publication number: WO2023162547A1
Application number: PCT/JP2023/002093
Authority: WO
Inventors: 幹生小林
Original assignee: サンデン株式会社
Priority date: 2022-02-22
Filing date: 2023-01-24
Publication date: 2023-08-31
Also published as: JP2023122007A; CN118647793A

Abstract

[Problem] To provide an electric compressor with which noise caused by vibration of a cover member of an inverter-housing section can be reduced while ensuring vibration resistance of an inverter circuit board and minimizing any reduction of the mounting area of electronic components on the inverter circuit board. [Solution] In an electric compressor 1, an inverter 5 includes a circuit board 7 on which electronic components are mounted, and an inverter-housing section 6 that houses the inverter 5 includes a housing section body 61, a board-fixing section to which the circuit board 7 is fixed, and a cover member 62. Among the electronic components, predetermined electronic components such as a smoothing capacitor 51 and a filter capacitor 54a are fixedly placed on a cover-member-side surface of the circuit board 7 in a state of being mold-sealed with a thermosetting second insulating resin IR2, and a vibration-isolating member 70 for reducing vibrations of the cover member 62 is placed between the mold-sealed predetermined electronic component and the cover member 62.

Description

electric compressor

The present invention relates to an electric compressor integrally having an inverter.

Many of the electric compressors used to compress refrigerant in vehicle air conditioners have an integrated inverter that converts DC power from an on-board battery into AC power while supplying power to the electric motor that drives the compression mechanism. It controls and drives the electric motor. This type of electric compressor includes a housing that accommodates an electric motor and a compression mechanism, and an inverter accommodating section that is provided integrally with the housing and accommodates an inverter. Further, the inverter housing portion includes a housing body having an opening and a cover member that closes the opening of the housing body. is configured as

Here, vibrations generated by the compression mechanism or the like may be transmitted to the cover member via the housing and the main body of the accommodating portion, causing the cover member to vibrate and generate noise. Regarding this point, Patent Document 1 discloses that vibration of the cover member is suppressed by arranging a vibration isolating member between the cover member and the head of the bolt that fixes the circuit board constituting the inverter. Reducing vibration-induced noise is described.

JP 2020-56376 A

Due to the recent electrification of automobiles, the electric compressors used therein are required to be lighter, quieter, and have EMC (electromagnetic compatibility) measures more than ever. In particular, due to EMC countermeasures, the size of the noise filter of the inverter is increased, and the volume of the inverter accommodating portion is also increased. As a result, the rigidity of the cover member is relatively lowered, and the fastening portion (fixed portion) of the cover member to the housing portion main body is separated, making the cover member susceptible to vibration. There was a risk that the noise caused by the vibration of the

On the other hand, it is also conceivable to increase the rigidity of the cover member by increasing the fastening points (fixed points) on the central side of the cover member. However, since the inverter includes a circuit board on which various electronic components such as a noise filter are mounted, increasing the fastening points (fixing points) on the central side of the cover member reduces the mounting area of the electronic components on the circuit board. This is not preferable because it restricts the mounting of electronic components on the circuit board.

Also, some of the electronic components mounted on the circuit board of the inverter required reinforcement (anti-vibration reinforcement) in order to ensure the vibration resistance of the circuit board.

Accordingly, the present invention ensures the vibration resistance of the circuit board of the inverter and reduces the noise caused by the vibration of the cover member of the inverter accommodating section while suppressing the decrease in the mounting area of the electronic components on the circuit board of the inverter. An object of the present invention is to provide an electric compressor capable of

According to one aspect of the present invention, an electric compressor is provided. The electric compressor includes a housing that houses an electric motor and a compression mechanism driven by the electric motor, an inverter that drives the electric motor, the inverter including a circuit board on which electronic components are mounted, and the inverter. an inverter housing portion for housing a housing portion body having an opening; a substrate fixing portion provided so as to protrude from an inner bottom surface of the housing portion body facing the opening and to which the circuit board is fixed; An inverter accommodating portion including a cover member that closes the opening of the accommodating portion main body, and a vibration isolating member that suppresses vibration of the cover member are included. Predetermined electronic components among the electronic components are fixedly arranged on the cover member side surface of the circuit board in a state of being mold-sealed with a thermosetting insulating resin, and the vibration isolating member is , is arranged between the predetermined electronic component sealed in a mold and the cover member.

According to the present invention, the vibration resistance of the circuit board of the inverter is ensured, and the noise caused by the vibration of the cover member of the inverter accommodating section is reduced while suppressing the decrease in the mounting area of the electronic components on the circuit board of the inverter. It is possible to provide an electric compressor that can

1 is a schematic longitudinal sectional view of an electric compressor according to a first embodiment; FIG. It is the figure which looked at the electric compressor which concerns on 1st Embodiment in the state which the cover member of the inverter accommodating part was removed from the inverter accommodating part side. It is a figure which shows the circuit structural example of the inverter of the electric compressor which concerns on 1st Embodiment. It is a figure which shows the inside of an inverter accommodating part. FIG. 4 shows a power switching element; FIG. 4 shows a switching element module; It is a figure which shows the installation state of the switching element module (power switching element) in an inverter accommodating part. It is a figure which shows the circuit board of an inverter. It is a figure which shows the circuit board of an inverter. It is a figure which shows the circuit board of an inverter. FIG. 4 is a diagram showing a state in which the circuit board of the inverter is placed on the board fixing portion; It is a figure which shows an inverter accommodating part (accommodating part main body, cover member), a vibration-proof member, and the circuit board of an inverter. It is a schematic longitudinal cross-sectional view of an electric compressor according to a second embodiment. It is a schematic longitudinal cross-sectional view of the electric compressor which concerns on 3rd Embodiment.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

[First embodiment]
FIG. 1 is a schematic longitudinal sectional view of an electric compressor 1 according to the first embodiment. The electric compressor 1 according to the embodiment is a so-called inverter-integrated electric compressor that integrally includes an inverter. For example, the electric compressor 1 may be mounted on a vehicle to constitute a part of a refrigerant circuit of a vehicle air conditioner, and may be configured to compress and discharge refrigerant.

Referring to FIG. 1, an electric compressor 1 includes an electric motor 2, a compression mechanism 3 that is driven by the electric motor to compress refrigerant, a housing 4 that houses the electric motor 2 and the compression mechanism 3, and the electric motor 2. It includes an inverter 5 to be driven and an inverter housing portion 6 housing the inverter 5 .

The electric motor 2 is, for example, a three-phase synchronous motor (brushless DC motor). The compression mechanism 3 is, for example, a scroll compression mechanism. The electric motor 2 and the compression mechanism 3 are arranged in series in the housing 4 in the axial direction of the output shaft 2 a of the electric motor 2 . An output shaft 2a of the electric motor 2 is connected to a compression mechanism 3 (orbiting scroll in the case of a scroll compression mechanism).

The inverter 5 includes various electronic components (described later) and a circuit board 7 on which various electronic components are mounted. In other words, in this embodiment, various electronic components are mounted on the circuit board 7 to form the inverter 5 .

The inverter housing portion 6 is provided integrally with the housing 4 . The inverter housing portion 6 is disposed on one end side of the housing 4 in the axial direction, specifically, on the side opposite to the compression mechanism 3 with the electric motor 2 interposed therebetween. In this embodiment, the inverter accommodating portion 6 includes an accommodating portion main body 61 integrally formed with the housing 4 and a cover member 62 that is removable from the accommodating portion main body 61 .

The housing portion main body 61 has a bottom wall 611 and a peripheral wall 612 that rises from the peripheral edge of the bottom wall 611 and defines an opening facing the bottom wall 611 . The cover member 62 is attached to the housing body 61 and configured to close the opening. A part of the bottom wall 611 of the housing portion main body 61 (also the bottom wall of the inverter housing portion 6 ) constitutes a partition wall 8 that separates the inside of the housing 4 and the inside of the inverter housing portion 6 . The power supply line 9 from the inverter 5 to the electric motor 2 extends through the partition wall 8 (the bottom wall 611 of the housing main body 61) in an airtight and liquid-tight manner.

FIG. 2 is a view of the electric compressor 1 in a state in which the cover member 62 of the inverter housing portion 6 is removed, viewed from the inverter housing portion 6 side. As shown in FIG. 2, the circuit board 7 forming the inverter 5 is mounted inside the inverter accommodating portion 6 (accommodating portion main body 61) with a plurality of first fixing bolts 11 (fixing members).

Returning to FIG. 1, a coolant inlet port 4a is formed in the partition wall 8 side of the housing 4 to allow the coolant from the outside to flow into the housing 4 . The refrigerant that has flowed into the housing 4 flows through the housing 4 (gap between the electric motor 2 ) and reaches the compression mechanism 3 . The compression mechanism 3 is driven by the electric motor 2 to compress and discharge the refrigerant.

The refrigerant that flows into the housing 4 is, for example, a refrigerant that has passed through an expansion valve and an evaporator in the refrigerant circuit of the vehicle air conditioner, and is a low-temperature, low-pressure refrigerant. Therefore, the partition wall 8 and the electric motor 2 can be cooled by the coolant flowing into the housing 4 from the coolant inlet 4a. The refrigerant that has flowed through the housing 4 is compressed by the compression mechanism 3 and discharged from the compression mechanism 3 as a high-temperature, high-pressure refrigerant. The (high-temperature, high-pressure) refrigerant discharged from the compression mechanism 3 flows out from a refrigerant outlet port 4 b formed in the housing 4 .

Here, the inverter 5 will be briefly explained. FIG. 3 is a diagram showing a circuit configuration example of the inverter 5. As shown in FIG. In this embodiment, the inverter 5 is configured to convert DC power from an external power source (for example, a vehicle-mounted battery) VB into three-phase AC power and supply the electric motor 2 with the three-phase AC power.

As shown in FIG. 3, the inverter 5 includes a smoothing capacitor 51, a switching section 52, a control circuit 53, and a noise filter . These components are mounted on the circuit board 7 to form the inverter 5, as described above.

The smoothing capacitor 51 is connected between the power line of the external power supply VB and the ground line, and smoothes the DC voltage from the external power supply VB.

The switching section 52 includes six power switching elements Q1-Q6 and six diodes D1-D6. Although not particularly limited, the power switching elements Q1 to Q6 may be IGBTs (insulated gate bipolar transistors). The switching unit 52 converts the DC voltage from the external power supply VB smoothed by the smoothing capacitor 51 into a three-phase AC voltage by controlling (PMW control) the power switching elements Q1 to Q6 to the electric motor 2. configured to supply

Further describing the switching section 52, the switching section 52 has a U-phase arm, a V-phase arm, and a W-phase arm provided in parallel between the power supply line of the external power supply VB and the ground line.

Two power switching elements Q1 and Q2 are connected in series to the U-phase arm, and diodes D1 and D2 are connected in anti-parallel to the power switching elements Q1 and Q2, respectively. Two power switching elements Q3 and Q4 are connected in series to the V-phase arm, and diodes D3 and D4 are connected in anti-parallel to the power switching elements Q3 and Q4, respectively. Two power switching elements Q5 and Q6 are connected in series to the W-phase arm, and diodes D5 and D6 are connected in anti-parallel to the power switching elements Q5 and Q6, respectively.

In addition, the intermediate points of the U-, V-, and W-phase arms are connected to the other ends of the U-, V-, and W-phase coils of the electric motor 2 which are star-connected at one end of each. That is, the midpoint of power switching elements Q1 and Q2 of the U-phase arm is connected to the U-phase coil, the midpoint of power switching elements Q3 and Q4 of the V-phase arm is connected to the V-phase coil, and the midpoint of power switching elements Q3 and Q4 of the V-phase arm is connected to the V-phase coil. An intermediate point of power switching elements Q5 and Q6 is connected to the W-phase coil.

By controlling the ratio between the ON period of the power switching element on the power supply line side and the ON period of the power switching element on the ground line side of each phase arm, that is, the plurality of power switching elements Q1 to Q6 are PWM-controlled. As a result, the switching unit 52 can convert the DC power from the external power supply VB smoothed by the smoothing capacitor 51 into three-phase AC power and supply it to the electric motor 2 . can drive.

The control circuit 53 controls the power switching elements Q1 to Q6 (PWM Control.

The noise filter 54 includes capacitors, coils (inductors), and the like. Although not particularly limited, in the present embodiment, the noise filter 54 is provided between the smoothing capacitor 51 and the switching section 52, and mainly causes ripple noise caused by the operation of the power switching elements Q1 to Q6. and EMI/EMC noise.

Next, the accommodation structure of the inverter 5 in this embodiment will be described. As described above, the inverter 5 is housed in the inverter housing portion 6 in this embodiment.

[Inverter housing part 6]
FIG. 4 is a diagram showing the inside of the inverter accommodating portion 6 (without the inverter 5). As described above, the inverter housing portion 6 includes the housing portion main body 61 and the cover member 62 . Further, in the present embodiment, the inverter housing portion 6 has therein an installation portion 63 in which the power switching elements Q1 to Q6 are installed, and a board fixing portion 64 in which the circuit board 7 constituting the inverter 5 is fixed. .

The installation portion 63 is provided on the inner bottom surface 61a of the housing portion main body 61, that is, the surface of the partition wall 8 on the inverter housing portion 6 side. An inner bottom surface 61 a of the housing portion main body 61 faces the opening of the housing portion main body 61 .

Although only one bolt is shown in FIG. 4, a second fixing bolt 12 (see FIG. 5) as a fixing member for fixing each of the power switching elements Q1 to Q6 is screwed to the installation portion 63. The same number of bolt holes 631 as the power switching elements Q1 to Q6 (that is, six) are formed.

The board fixing portion 64 is provided so as to protrude from the inner bottom surface 61 a of the accommodating portion main body 61 (toward the opening of the accommodating portion main body 61 ), and is positioned farther from the inner bottom surface 61 a of the accommodating portion main body 61 than the installation portion 63 . is configured to support the circuit board 7 with. In other words, the circuit board 7 is arranged at a position closer to the cover member 62 than the power switching elements Q1 to Q6 in the inverter housing portion 6 . In this embodiment, the board fixing portion 64 includes a plurality of projecting portions 641 each protruding from the inner bottom surface of the housing portion main body 61, and the upper surface of each of the plurality of projecting portions 641 is provided with a first fixing member as a fixing member. A bolt hole into which a bolt 11 (see FIGS. 1 and 2) is screwed is formed.

[Power switching elements Q1 to Q6 and switching element modules]
FIG. 5 is a diagram showing a power switching element. In this embodiment, each of the power switching elements Q1 to Q6 has an insertion hole (hereinafter referred to as "first insertion hole") 21 through which the second fixing bolt 12 for fixing itself is inserted. The first insertion hole 21 penetrates from the upper surface to the lower surface of the power switching element.

Also, each of the power switching elements Q1 to Q6 has three terminals 22 . In this embodiment, the three terminals 22 extend laterally from one side surface of the power switching element and are bent halfway so that their tips face upward.

In this embodiment, as shown in FIG. 6, the power switching elements Q1 to Q6 are hardened with a thermosetting first insulating resin IR1 such as epoxy resin, that is, integrated to form the switching element module 30. Configure.

In this embodiment, as shown in FIG. 7, the switching element module 30 is fixed to the installation portion 63 by the same number of second fixing bolts 12 as the power switching elements Q1 to Q6.

[Circuit board 7]
The circuit board 7 will be described with reference to FIGS. 1 and 8 to 11. FIG. In this embodiment, the circuit board 7 is attached and fixed to the board fixing portion 64 after the switching element module 30 is installed (fixed) to the installation portion 63 .

In the present embodiment, among the electronic components constituting the inverter 5, electronic components other than the power switching elements Q1 to Q6 are mounted on the circuit board 7 in advance. Specifically, in the present embodiment, a smoothing capacitor 51 and diodes D1 to D6 are provided on a surface 7a of the circuit board 7 facing the cover member 62 (hereinafter referred to as "cover member side surface") 7a in the inverter housing portion 6. , the control circuit 53, the filter capacitor 54a forming the noise filter 54, and the filter coil 54b forming the noise filter 54 are mounted in advance. However, the diodes D1 to D6 are omitted in FIGS.

Further, the circuit board 7 is formed with terminal holes 71 through which terminals 22 of the power switching elements Q1 to Q6 are connected (inserted). Furthermore, the circuit board 7 is formed with a plurality of insertion holes (hereinafter referred to as “second insertion holes”) 72 through which the first fixing bolts 11 can be inserted. The plurality of second insertion holes 72 are arranged so as to correspond to the plurality of protruding portions 641 forming the board fixing portion 64 .

Here, in the present embodiment, among the other electronic components mounted on the circuit board 7, a predetermined electronic component having a relatively high height, in other words, an electronic component susceptible to vibration, Anti-vibration reinforcement is applied. Although not particularly limited, in this embodiment, the predetermined electronic components that are relatively tall (susceptible to vibration) are the smoothing capacitor 51, the filter capacitor 54a, and the filter coil 54b.

Specifically, referring to FIGS. 1, 8, and 9, the predetermined electronic components (smoothing capacitor 51, filter capacitor 54a, and filter coil 54b) are placed inside the filter case 55 with a thermosetting second insulating resin. It is molded with IR2 and integrated with the filter case 55, and in this state (that is, together with the filter case 55) is fixedly arranged on the surface 7a of the circuit board 7 on the side of the cover member. The second insulating resin IR2 may be the same type of resin as the first insulating resin IR1, or may be a different resin.

To further explain the anti-vibration reinforcement for the predetermined electronic components, the predetermined electronic components (smoothing capacitor 51, filter capacitor 54a and filter coil 54b) are attached to the cover member side surface 7a of the circuit board 7 by soldering. there is

The filter case 55 is made of, for example, a metal material. As shown in FIG. 10, the filter case 55 is formed in the shape of a box with one side open, and has a size capable of accommodating the predetermined electronic components attached to the surface 7a of the circuit board 7 on the side of the cover member. are doing. At least part of the outer bottom surface 55a of the filter case 55 is formed as a flat surface. In addition, the filter case 55 has a plurality of insertion holes (hereinafter referred to as "third insertion holes") 551 through which the first fixing bolts 11 can be inserted, around the opening. The plurality of third insertion holes 551 are arranged so as to correspond to part of the second insertion holes 72 of the circuit board 7 .

The circuit board 7 on which the predetermined electronic components are mounted is combined with a filter case 55 filled with an appropriate amount of thermosetting second insulating resin IR2. Specifically, as shown in FIG. 10, the circuit board 7 and the filter case 55 are arranged such that the circuit board 7 is on the upper side and the filter case 55 (filled with the second insulating resin IR2) is on the lower side. , and the predetermined electronic parts are inserted into the filter case 55 through the opening of the filter case 55 . At this time, each third insertion hole 551 of the filter case 55 and the corresponding second insertion hole 72 of the circuit board 7 are aligned. As a result, the predetermined electronic components soldered to the surface 7a of the circuit board 7 on the side of the cover member are sealed in the filter case 55 with the second insulating resin IR2 and integrated with the filter case 55. .

After that, as shown in FIG. 11, the circuit board 7 is placed on the board fixing portion 64 of the inverter accommodating portion 6 (that is, the upper surface of the plurality of projecting portions 641) with the cover member side surface 7a facing upward. At this time, the plurality of second insertion holes 72 of the circuit board 7 are arranged over the bolt holes formed on the upper surfaces of the plurality of protrusions 641 . Further, the terminals 22 of the power switching elements Q1 to Q6 in the switching element module 30 installed in the installation portion 63 are inserted through the terminal holes 71 of the circuit board 7, and the tip portions of the terminals 22 are connected to the cover of the circuit board 7. It protrudes from the surface 7a on the member side.

Then, the circuit board 7 placed on the board fixing portion 64 (upper surfaces of the plurality of projecting portions 641) is fixed to the board fixing portion 64 by the plurality of first fixing bolts 11. As shown in FIG. Specifically, the plurality of first fixing bolts 11 inserted through the plurality of second insertion holes 72 are screwed into the bolt holes formed in the upper surfaces of the plurality of projecting portions 641, so that the circuit board 7 is It is fixed to the substrate fixing portion 64 . At this time, the filter case 55 is fastened together with the circuit board 7 to the board fixing portion 64 by several first fixing bolts 11 (see FIG. 2). As a result, the filter case 55 is arranged in a state of being firmly fixed on the surface 7a of the circuit board 7 on the side of the cover member. The outer bottom surface 55a of the filter case 55 constitutes the tip surface of the filter case 55 fixedly arranged on the surface 7a of the circuit board 7 on the cover member side.

Also, the power switching elements Q1 to Q6 and the circuit board 7 are electrically connected by soldering the tips of the terminals 22 of the power switching elements Q1 to Q6 to the circuit board 7 . In other words, the power switching elements Q1 to Q6 are mounted on the surface of the circuit board 7 opposite to the surface 7a on the cover member side (the surface on the inner bottom surface 61a side of the housing portion main body 61).

Although detailed description is omitted, the power supply line 9 (or its terminal portion) is also inserted through an insertion hole formed in the circuit board 7, and the tip portion protrudes from the surface 7a of the circuit board 7 on the side of the cover member. It is electrically connected to the circuit board 7 by an omitted connecting member or the like. Further, the circuit board 7 is electrically connected to the external power source VB through the connector 13 when placed on the board fixing portion 64 .

[Cover member 62]
FIG. 12 is a diagram showing the inverter accommodating portion 6 (accommodating portion main body 61 and cover member 62), the anti-vibration member 70, and the circuit board 7. As shown in FIG. In this embodiment, after the circuit board 7 is fixed to the board fixing portion 64 and the above-described electrical connections are made, the cover member 62 is attached to the housing portion main body 61 via fastening bolts (not shown) or the like. be done. As a result, the inverter 5 is housed in the inverter housing portion 6 .

In the present embodiment, the cover member 62 bulges in a direction away from the housing portion main body 61 more than other portions of the cover member 62 , in other words, in a direction away from the circuit board 7 fixed to the board fixing portion 64 . It has a bulging portion 62a. The bulging portion 62a is provided at a position corresponding to the filter case 55 on the surface 7a of the circuit board 7 on the cover member side, and is configured to accommodate the portion of the front end side of the filter case 55 inside. In addition, the inner surface of the bulging portion 62a is a flat surface.

When the cover member 62 is attached to the housing portion main body 61 , the anti-vibration member 70 is provided between the front end surface (outer bottom surface 55 a ) of the filter case 55 on the circuit board 7 and the inner surface of the bulging portion 62 a of the cover member 62 . is placed. The vibration isolating member 70 is provided mainly for reducing (including absorbing) vibration of the cover member 62 . The vibration isolation member 70 can be made of a flexible material, preferably a flexible and heat-dissipating material. Although not particularly limited, the vibration-isolating member 70 may be, for example, a sheet-like heat radiation/vibration-isolating material containing silicone resin as a main component.

By attaching the cover member 62 to the housing portion main body 61, the vibration isolating member 70 is sandwiched between the front end surface (outer bottom surface 55a) of the filter case 55 and the inner surface of the bulging portion 62a of the cover member 62 and is compressed by an appropriate amount. be.

According to the electric compressor 1 according to this embodiment, the following effects can be obtained.

Predetermined electronic components (smoothing capacitor 51, filter capacitor 54a, and filter coil 54b) among the electronic components mounted on the circuit board 7 of the inverter 5 are sealed with a thermosetting second insulating resin IR2. is fixed on the surface 7a of the circuit board 7 on the side of the cover member. More specifically, the predetermined electronic component is molded and sealed in the filter case 55 with the thermosetting second insulating resin IR2 and integrated with the filter case 55 . By fastening the filter case 55 together with the circuit board 7 to the board fixing portion 64, the predetermined electronic components are fixedly arranged on the cover member side surface 7a of the circuit board 7 together with the filter case 55. It is Therefore, the predetermined electronic component is firmly fixed in an integrated state, and the vibration resistance of the predetermined electronic component and, by extension, the circuit board 7 can be ensured.

Further, a vibration isolating member 70 for reducing vibration of the cover member 62 is arranged between the predetermined electronic component molded and sealed and the cover member 62 . More specifically, it is sandwiched between the front end surface of the filter case 55 and the inner surface of the bulging portion 62a of the cover member 62 that accommodates the portion on the front end side of the filter case 55 . That is, in the present embodiment, the vibration isolating member 70 is arranged using the space above the area of the circuit board 7 where the predetermined electronic components are mounted. Therefore, vibration of the cover member 62 can be reduced by the vibration isolating member 70 while suppressing reduction in the mounting area of the electronic components on the circuit board 7 . Therefore, noise caused by vibration of the cover member 62 can also be reduced.

In particular, since the cover member 62 has the bulging portion 62a, the rigidity of the cover member 62 is increased and a thicker (more compressed) vibration isolating member 70 can be used. Vibration of member 62 and resulting noise can be further reduced.

It should be noted that in the above-described embodiment, the filter case 55 and the circuit board 7 are fastened together with the board fixing portion 64 . However, it is not limited to this. The filter case 55 needs only to be fixedly arranged on the surface 7a of the circuit board 7 on the side of the cover member. may be fixedly arranged on the surface 7a of the circuit board 7, or may be directly fixed to the circuit board 7. FIG.

Also, in the above-described embodiment, the cover member 62 has a bulging portion 62a. However, the cover member 62 does not necessarily have to have the bulging portion 62a. In this case, the vibration isolating member 70 can be sandwiched between the (flat) tip surface of the filter case 55 and the (flat) inner surface (flat surface) of the cover member 62 and can be compressed by an appropriate amount.

[Second embodiment]
FIG. 13 is a schematic longitudinal sectional view of the electric compressor 10 according to the second embodiment. Hereinafter, the configuration of the electric compressor 10 according to the second embodiment, which is mainly different from the electric compressor 1 according to the first embodiment, will be described, and the configuration common to the electric compressor 1 according to the first embodiment will be described. are omitted. Further, the same reference numerals are used for the components common to the electric compressor 1 (FIG. 1) according to the first embodiment, and the description thereof is omitted.

The main difference between the electric compressor 1 (FIG. 1) according to the first embodiment and the electric compressor 10 (FIG. 13) according to the second embodiment is that the electric compressor 10 according to the second embodiment has a filter The difference is that the case 55 is not used.

Also in the electric compressor 10 according to the second embodiment, the predetermined electronic components (the smoothing capacitor 51, the filter capacitor 54a, and the filter coil 54b) are mounted on the circuit board 7 while being molded with the second insulating resin IR2. It is fixedly arranged on the surface 7a on the side of the cover member. However, in the electric compressor 10 according to the second embodiment, the filter case 55 is not used, and the predetermined electronic components are attached to the surface 7a of the circuit board 7 on the cover member side by soldering. , the surface 7a of the circuit board 7 on the side of the cover member is molded with a thermosetting second insulating resin IR2 to be integrated with the circuit board 7. As shown in FIG.

In this case, preferably, on the surface 7a of the circuit board 7 on the side of the cover member, the predetermined electronic component is entirely covered with the second thermosetting insulating resin IR2. At least a portion of the tip of the IR2, in other words, the tip of the predetermined electronic component molded with the thermosetting second insulating resin IR2, is formed as a flat surface.

In addition, the vibration isolating member 70 is configured to be sandwiched between the predetermined electronic component and the cover member 62 that are molded and compressed by an appropriate amount. More specifically, the cover member 62 has a bulging portion 62 a that bulges in a direction away from the circuit board 7 fixed to the board fixing portion 64 more than other portions of the cover member 62 . The bulging portion 62a is configured so as to be able to accommodate therein the portion on the front end side of the predetermined electronic component that is molded and sealed. The inner surface of the bulging portion 62a is a flat surface. Then, the anti-vibration member 70 is sandwiched between the front end portion of the predetermined electronic component molded and sealed and the inner surface of the bulging portion 62a of the cover member 62, and is compressed by an appropriate amount.

The same effect as the electric compressor 1 according to the first embodiment can be obtained with the electric compressor 10 according to the second embodiment. That is, the vibration resistance of the circuit board 7 can be ensured, and the noise caused by the vibration of the cover member 62 can be reduced while suppressing the decrease in the mounting area of the electronic components on the circuit board 7 . In addition, in the electric compressor 10 according to the second embodiment, the cover member 62 does not necessarily need to have the bulging portion 62a.

[Third Embodiment]
FIG. 14 is a schematic longitudinal sectional view of an electric compressor 100 according to the third embodiment. Hereinafter, the configuration of the electric compressor 100 according to the third embodiment, which is different from the electric compressor 10 according to the second embodiment, will be mainly described. A description of the configuration common to the electric compressor 10 according to the embodiment is omitted. In addition, the same reference numerals are used for components that are common to the electric compressor 1 ( FIG. 1 ) according to the first embodiment and the electric compressor 10 according to the second embodiment, and descriptions thereof are omitted.

The main difference between the electric compressor 10 (FIG. 13) according to the second embodiment and the electric compressor 100 (FIG. 14) according to the third embodiment is that the electric compressor 100 according to the third embodiment has the above-described Among the predetermined electronic components (smoothing capacitor 51, filter capacitor 54a and filter coil 54b), the taller smoothing capacitor 51 and filter capacitor 54a are not molded.

In the electric compressor 100 according to the third embodiment, mold sealing is omitted for the smoothing capacitor 51 and the filter capacitor 54a among the predetermined electronic components. The vibration isolating member 70 is configured to reduce the vibration of the cover member 62 and also reduce the vibration of the smoothing capacitor 51 and the filter capacitor 54a among the predetermined electronic components. That is, in the electric compressor 100 according to the third embodiment, the vibration isolating member 70 is sandwiched between the smoothing capacitor 51 and the cover member 62 to be compressed by an appropriate amount, and is sandwiched by the filter capacitor 54a and the cover member 62 to be compressed by an appropriate amount. configured to be compressed.

More specifically, the cover member 62 has a bulging portion 62a that bulges in a direction away from the circuit board 7 fixed to the board fixing portion 64 relative to other portions of the cover member 62 . The bulging portion 62a is configured so as to be able to accommodate therein the tip side portion of the smoothing capacitor 51 and the tip side portion of the filter capacitor 54a. The anti-vibration member 70 is sandwiched between the tip of the smoothing capacitor 51 and the inner surface of the bulging portion 62a of the cover member 62 and is compressed by an appropriate amount. It is configured to be clamped by the inner surface of the and compressed by an appropriate amount. Here, the shape of the vibration isolating member 70 is, for example, the shape of the tip of the smoothing capacitor 51, the distance between the tip of the smoothing capacitor 51 and the inner surface of the bulging portion 62a of the cover member 62, and the shape of the tip of the filter capacitor 54a. It is determined in consideration of the shape and the distance between the tip of the filter capacitor 54 a and the inner surface of the bulging portion 62 a of the cover member 62 .

Also in the electric compressor 100 according to the third embodiment, the vibration resistance of the predetermined electronic components and thus the circuit board 7 can be ensured, and the reduction in the mounting area of the electronic components on the circuit board 7 can be suppressed. Noise caused by vibration of 62 can be reduced.

Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to the above-described embodiments and modifications, and further modifications are possible based on the technical idea of the present invention. Of course.

DESCRIPTION OF

SYMBOLS

1, 10, 100... Electric compressor, 2... Electric motor, 3... Compression mechanism, 4... Housing, 5... Inverter, 6... Inverter accommodating part, 7... Circuit board, 7a... Cover member side surface, 30... Switching Element module 51 Smoothing capacitor 54 Noise filter 54a Filter capacitor 55 Filter case (case member) 61 Housing body 62 Cover member 62a Swelling portion 64 Substrate fixing portion 70... Anti-vibration member, IR1... Thermosetting first insulating resin, IR2... Thermosetting second insulating resin (thermosetting resin), Q1 to Q6... Power switching element

Claims

a housing that houses an electric motor and a compression mechanism driven by the electric motor;
an inverter for driving the electric motor, the inverter including a circuit board on which electronic components are mounted;
An inverter housing portion for housing the inverter, the housing portion main body having an opening, and a board fixing portion protruding from an inner bottom surface of the housing portion main body facing the opening, to which the circuit board is fixed. and an inverter accommodating portion including a cover member that closes the opening of the accommodating portion main body;
a vibration isolating member that reduces vibration of the cover member;
including
predetermined electronic components among the electronic components are fixedly arranged on the cover member side surface of the circuit board in a state of being mold-sealed with a thermosetting resin;
The vibration isolating member is arranged between the predetermined electronic component that is molded and sealed and the cover member.
electric compressor.
The predetermined electronic component is molded and sealed with the thermosetting resin in the case member, is integrated with the case member, and is fixedly arranged on the cover member side surface of the circuit board together with the case member. ,
2. The electric compressor according to claim 1, wherein said vibration isolating member is sandwiched between said case member and said cover member.
The electric compressor according to claim 2, wherein the case member is fastened together with the circuit board to the board fixing portion.
the cover member has a bulging portion that bulges in a direction away from the circuit board relative to other portions of the cover member, the bulging portion accommodating the front end side of the case member inside;
The vibration isolating member is sandwiched between the tip surface of the case member and the inner surface of the bulging portion of the cover member,
The electric compressor according to claim 2 or 3.
The predetermined electronic component is integrated with the circuit board by the thermosetting resin,
2. The electric compressor according to claim 1, wherein said vibration isolating member is sandwiched between said predetermined electronic component and said cover member which are molded and sealed.
The cover member is a bulging portion that bulges in a direction away from the circuit board more than other portions of the cover member, and the bulge accommodates therein the tip end side of the predetermined electronic component that is molded and sealed. having an outlet,
The vibration-isolating member is sandwiched between the front end portion of the predetermined electronic component that is mold-sealed and the inner surface of the bulging portion of the cover member,
The electric compressor according to claim 5.
a housing that houses an electric motor and a compression mechanism driven by the electric motor;
an inverter for driving the electric motor, the inverter including a circuit board on which electronic components are mounted;
An inverter housing portion for housing the inverter, the housing portion main body having an opening, and a board fixing portion protruding from an inner bottom surface of the housing portion main body facing the opening, to which the circuit board is fixed. and an inverter accommodating portion including a cover member that closes the opening of the accommodating portion main body;
a vibration isolating member that reduces vibration of the cover member;
including
predetermined electronic components among the electronic components are arranged on the surface of the circuit board on the side of the cover member;
The vibration isolating member is sandwiched between the predetermined electronic component and the cover member,
electric compressor.
The cover member has a bulging portion that bulges in a direction away from the circuit board relative to other portions of the cover member, and that accommodates the leading end side of the predetermined electronic component therein. ,
The vibration-isolating member is sandwiched between the tip portion of the predetermined electronic component and the inner surface of the bulging portion of the cover member,
The electric compressor according to claim 7.
9. The predetermined electronic component includes at least one of a smoothing capacitor that smoothes a DC voltage from a DC power supply, a filter capacitor that constitutes a noise filter, and a filter coil that constitutes a noise filter. The electric compressor according to any one of.