JP2020143594A - Motor compressor - Google Patents

Abstract

To provide a motor compressor which enables a vibration control material for damping vibration of a cover of an inverter housing part to be arranged without forming a special structure at the housing side and causing harmful effect on a substrate.SOLUTION: A motor compressor includes: a housing 2; an inverter 10; an inverter housing part 8; and a cover 11 which is fixed to the housing 2 and closes the inverter housing part 8. The inverter 10 has a filter circuit board 66 on which circuit elements are mounted. The filter circuit board 66 is attached to the housing 2 by bolts 36A, and a vibration control material 39 is disposed between the bolts 36A and the cover 11.SELECTED DRAWING: Figure 1

Description

The present invention relates to a so-called inverter-integrated electric compressor in which an inverter is housed in an inverter accommodating portion formed in a housing.

Conventionally, in this type of inverter-integrated electric compressor, an inverter (inverter device) is accommodated and fixed in an inverter accommodating portion formed in a metal housing (accommodating portion main body), and the inverter accommodating portion is made of metal. It was blocked by the cover of. In this cover, the peripheral edge is fixed with bolts, but in order to vibrate and generate noise during operation, conventionally, the support column for fixing the board is extended to the vicinity of the cover, and the support is controlled between the support column and the cover. The vibration was damped by sandwiching the vibration material (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-117445

However, in such a conventional configuration, a strut structure for arranging the damping material between the cover and the housing must be formed. Further, if the vibration damping material is directly interposed between the substrate and the cover without adopting such a support column structure, stress may be applied to the substrate and the substrate may be damaged.

The present invention has been made to solve the conventional technical problems, and the damping material for damping the vibration of the cover of the inverter accommodating portion is not formed on the housing side with a special structure. Moreover, it is an object of the present invention to provide an electric compressor which can be arranged without adversely affecting a substrate.

The electric compressor of the present invention includes a metal housing in which a motor is built, an inverter for driving the motor, an inverter accommodating portion which is composed of the housing and accommodates the inverter, and is fixed to the housing to accommodate the inverter. It is equipped with a metal cover that closes the part, and the inverter has a board on which circuit elements are mounted, and this board is attached to the housing by bolts, and between the bolt and the cover, It is characterized in that a vibration damping material is arranged.

In the electric compressor according to the second aspect of the present invention, in the above invention, the bolt has a grooved head, the damping material abuts on the head of the bolt, and the damping material avoids the groove. It is characterized in that a portion is formed.

The electric compressor according to the third aspect of the present invention is characterized in that, in each of the above inventions, the damping material is arranged so as to surround the bolt.

In the electric compressor of the invention of claim 4, in each of the above inventions, the cover is integrally formed with a protruding portion protruding toward the substrate at a position corresponding to the bolt, and the damping material is formed on the protruding portion of the cover. It is characterized by abutting.

The electric compressor according to the fifth aspect of the present invention is characterized in that, in each of the above inventions, the vibration damping material is made of an elastic material having an insulating property.

The electric compressor according to claim 6 is characterized in that, in each of the above inventions, the damping material is made of an elastic material having a hardness of 60 or more.

The electric compressor according to claim 7 is characterized in that, in each of the above inventions, the cover is fixed to the housing at the peripheral edge portion, and the damping material comes into contact with the cover at a position away from the peripheral edge portion. To do.

According to the present invention, a metal housing having a built-in motor, an inverter for driving the motor, an inverter accommodating portion composed of the housing and accommodating the inverter, and an inverter accommodating portion fixed to the housing are provided. In an electric compressor with a closed metal cover, the inverter has a substrate on which circuit elements are mounted, which is attached to the housing by bolts and vibration damping between the bolts and the cover. Since the material is arranged, the vibration damping material can be interposed between the bolt and the cover without forming a special structure on the housing side, and the vibration of the cover can be attenuated to reduce the noise.

In particular, since the damping material can be received by the bolts for fixing the inverter board to the housing, it is possible to avoid inconveniences such as damage due to the load of the cover being applied to the board.

Here, when the damping material is arranged between the bolt and the cover, the damping material comes into contact with the head of the bolt, but when the damping material comes into contact with the groove formed in the head of the bolt. , There is a risk that the damping material will be damaged due to strain concentration on the damping material in the portion corresponding to this groove. However, as in the invention of claim 2, avoid the groove on the head of the bolt in the damping material. If the relief portion is formed, such inconvenience is eliminated.

Further, if the damping material is arranged so as to surround the bolt as in the invention of claim 3, the damping material can be positioned by using the bolt, and the assembly workability is improved. improves.

Further, as in the invention of claim 4, a protruding portion protruding toward the substrate is integrally formed on the cover at a position corresponding to the bolt, and the damping material is brought into contact with the protruding portion of the cover to cause the damping material. Can be brought into contact with the cover (protruding portion) without any trouble, and the dimensional accuracy of the protruding portion is also improved to stabilize the load of the damping material.

Further, if the vibration damping material is made of an elastic material having an insulating property as in the invention of claim 5, the insulating property between the substrate and the cover is also ensured.

Further, by forming the vibration damping material with an elastic material having a hardness of 60 or more as in the invention of claim 6, it becomes possible to exert a sufficient vibration damping effect on the cover.

Furthermore, when the cover is fixed to the housing at the peripheral edge portion, the vibration of the cover can be suppressed by bringing the damping material into contact with the cover at a position separated from the peripheral edge portion as in the invention of claim 7. The material allows for effective damping.

It is a schematic longitudinal side view of the electric compressor of one Example to which this invention was applied. It is a top view which looked at the electric compressor of FIG. 1 with the cover removed from the side of the inverter accommodating part. It is an enlarged longitudinal side view of the part of the inverter accommodating part of the electric compressor of FIG. It is an enlarged vertical sectional view of the vibration damping material part of the inverter accommodating part of FIG.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic longitudinal side view of an electric compressor 1 of an embodiment to which the present invention is applied, FIG. 2 is a plan view of the inverter accommodating portion 8 with the cover 11 of the electric compressor 1 removed, and FIG. It is an enlarged vertical sectional side view of the part of the inverter accommodating part 8 of an electric compressor 1.

The electric compressor 1 of the embodiment is a so-called inverter-integrated electric compressor, and constitutes a part of a refrigerant circuit of a vehicle air conditioner for air-conditioning the interior of a vehicle (not shown). The electric compressor 1 includes a motor 6, a metal housing 2 incorporating a compression mechanism 7 driven by a rotating shaft 5 of the motor 6, and an inverter 10 for driving the motor 6. The inverter of the embodiment is provided. Reference numeral 10 denotes an inverter circuit unit 3 for controlling control and a filter circuit unit 4 for absorbing a high frequency component of the switching current.

On the outer surface of the housing 2 of the embodiment, an inverter accommodating portion 8 is formed located on one end side of the rotating shaft 5 of the motor 6 in the axial direction, and the opening 9 of the inverter accommodating portion 8 is the same as that of the housing 2. It is closed so that it can be opened and closed by the metal cover 11 of the above. The inverter circuit unit 3 and the filter circuit unit 4 constituting the inverter 10 are housed in the inverter housing unit 8, and are configured to be detachably attached to the housing 2. In each figure, the electric compressor 1 of the embodiment is shown with the inverter accommodating portion 8 facing up, but in reality, the inverter accommodating portion 8 is arranged in the horizontal direction so as to be on one side. is there.

The motor 6 of the embodiment is composed of a three-phase synchronous motor (brushless DC motor), and the compression mechanism 7 is, for example, a scroll type compression mechanism. The compression mechanism 7 is driven by the rotating shaft 5 of the motor 6, compresses the refrigerant, and discharges the refrigerant into the refrigerant circuit. Then, a low-temperature gas refrigerant sucked from an evaporator (also referred to as a heat absorber), which also constitutes a part of the refrigerant circuit, is circulated in the housing 2. Therefore, the inside of the housing 2 is cooled. The inverter accommodating portion 8 is partitioned from the inside of the housing 2 in which the motor 6 is accommodated by a partition wall 12 which is the bottom surface of the inverter accommodating portion 8, and the partition wall 12 is also cooled by a low-temperature gas refrigerant.

The inverter circuit unit 3 of the embodiment includes a power module 14 on which six power switching elements 13 (IGBTs in the embodiment) that form arms of each phase of the three-phase inverter circuit are mounted, and a control circuit 16 as circuit elements. A resin sleeve assembly 18 having a plurality of terminal connection portions 19, 20, 21, 22, and 23 is provided with an inverter control board (board) 17 on which the above is mounted.

The inverter circuit unit 3 converts DC power supplied from a vehicle battery (not shown) into three-phase AC power and supplies power to the stator coil 27 of the motor 6. Therefore, the connection points between the power switching element 13 on the upper arm side and the power switching element 13 on the lower arm side of each phase are on the three motor sides at the extraction terminals 24, 25, and 26 drawn from the partition wall 12 of the housing 2. The power terminal of the power switching element 13 on the upper arm side and the ground terminal of the power switching element 13 on the lower arm side are connected to each other via the connection terminal 28, and the filter circuit unit 4 and the high power connector (HV connector) 29 are connected to each other. It will be connected to the power harness from the battery described above via.

In this case, the extraction terminals 24 to 26 to which the connection points between the power switching element 13 on the upper arm side and the power switching element 13 on the lower arm side of each phase are connected penetrate the partition wall 12 and the motor 6 in the housing 2. It is connected to the stator coil 27 of. Further, the power supply terminal and the ground terminal are the filter circuit unit 4, the power supply side connection terminal 31 provided at the tip of each of the two wirings 98 drawn from the high power connector 29 described above, and the high power connector. It is electrically connected to the power harness via 29 and the like.

The terminal connection portions 19, 20, 21, 22, and 23 described above are projected from the sleeve assembly 18 of the embodiment, and the sleeve assembly 18 further has six sleeves 32. The sleeve 32 is made of a metal cylinder having a predetermined length, and the terminal connecting portions 19 to 23 and the sleeve 32 are integrally molded with the sleeve assembly 18 by an insulating hard resin. Each sleeve 32 is arranged in the peripheral portion of the sleeve assembly 18, and the upper and lower ends are exposed on the front surface and the back surface of the sleeve assembly 18 to open, and a bolt 36 (36A) for fixing to the housing 2 described later can be inserted. To.

The filter circuit unit 4 includes circuit elements such as a relatively large smoothing capacitor 63 connected between the power supply terminal and the installation terminal of the three-phase inverter circuit and a relatively large coil 64 connected to the power supply terminal. It is composed of a mounted filter circuit board (board) 66 and a support member 67 made of hard resin for accommodating these capacitors 63 and coils 64 (circuit elements).

The support member 67 has an opening on one side and has a container (case) shape having a depth dimension sufficient for accommodating the large smoothing capacitor 63 and the coil 64 as described above, and is formed in a peripheral portion of the support member 67. Is formed by five sleeves 68 having a predetermined length made of a metal cylinder, which are integrally molded with the support member 67 by an insulating hard resin, and are exposed and open on the front and back surfaces of the support member 67. Further, on one end side of the support member 67, two bag-shaped metal nut members 69 for connecting the power supply side connection terminal 31 with bolts 93 are formed, and similarly, the support member 67 is integrally resin-molded and the support member. It is exposed and open on the surface of 67. Further, two filter-side connection terminals 71 are similarly integrally resin-molded on the other end side of the support member 67.

Such an inverter circuit unit 3 and a filter circuit unit 4 are attached to the housing 2 by a plurality of bolts 36 and 36A (10 in the embodiment). In this case, first, the inverter circuit unit 3 and the filter circuit unit 4 are housed in the inverter housing unit 8 of the housing 2, respectively. Then, the bolts 36 and 36A are inserted into the insertion holes (not shown) of the inverter circuit unit 3 and the insertion holes (not shown) of the filter circuit unit 4, respectively, and screwed into the screw holes 83 and 86 of the housing 2 to be fastened. The inverter circuit unit 3 and the filter circuit unit 4 of the inverter 10 are detachably attached to the housing 2.

At this time, the bolt 36A (the bolt surrounded by the vibration damping material 39 described later shown by the broken line in FIGS. 1 and 2) located near the center of the inverter 10 is the inverter control board 17 of the inverter circuit unit 3 of the inverter 10. The filter circuit board 66 of the filter circuit unit 4 is attached to the housing 2 by co-fastening (FIG. 3). Further, in this state, the terminal connection portions 19, 20, and 21 of the inverter circuit unit 3 are adjacent to the drawer terminals 24, 25, and 26, respectively.

Next, the extraction terminals 24, 25, and 26 are press-fitted into one ends of the three motor-side connection terminals 28, respectively. As a result, one end of each motor-side connection terminal 28 is electrically connected to each of the drawer terminals 24 to 26 by pressure contact. Further, the terminal connection portions 19, 20 and 21 are inserted into the other end of the motor side connection terminal 28, and the drawer terminal 24 and the terminal connection portion 19, the drawer terminal 25 and the terminal connection portion 20, and the drawer terminal 26 and the terminal are inserted with nuts. Motor-side connection terminals 28 are attached between the connection portions 21.

As a result, the motor-side connection terminals 28 are fastened to the terminal connection portions 19 to 21 via the inverter control board 17. In this way, each motor side connection terminal 28 is fixed to the inverter control board 17 and electrically connected, and the extraction terminals 24 to 26 from the motor 6 are electrically connected to the inverter control board 17 by the motor side connection terminal 28. Connect to.

Further, the terminal connection portions 22 and 23 of the inverter circuit unit 3 and the filter side connection terminal 71 are connected with a nut. As a result, the filter side connection terminal 71 is fixed to the inverter control board 17 and electrically connected, and the filter circuit board 66 of the filter circuit unit 4 is electrically connected to the inverter control board 17 via the filter side connection terminal 71. Connecting.

Finally, a plurality of mounting holes 41 are formed on the peripheral edge of the opening 9 of the inverter housing portion 8, and the cover 11 is opened to the opening 9 of the inverter housing portion 8 by the bolt 43 screwed into the mounting holes 41. The opening 9 of the inverter accommodating portion 8 can be opened and closed by detachably attaching to the inverter accommodating portion 8. However, in the present invention, the bolt 36A is used in the inverter accommodating portion 8 between the cover 11 and the inverter 10. The vibration damping material 39 is arranged.

Next, the vibration damping material 39 provided in the inverter accommodating portion 8 will be described with reference to FIG. The damping material 39 is shown by a broken line in FIGS. 1 and 2. Here, as described above, in the embodiment, the bolt 36A located near the center of the inverter 10 is fixed to the housing 2 by co-tightening the inverter control board 17 of the inverter circuit unit 3 and the filter circuit board 66 of the filter circuit unit 4. (Fig. 3). The bolt 36A is located near the center of the inverter housing portion 8 (that is, near the center of the cover 11), away from the peripheral edge of the opening 9 of the inverter housing portion 8. Then, in the embodiment, the vibration damping material 39 is arranged between the bolt 36A located near the center of the inverter accommodating portion 8 and the cover 11.

The vibration damping material 39 is formed by molding an elastic material having an insulating property, and a rubber material having an insulating property such as EPDM in an embodiment into a cylindrical shape, and adopts a material having a hardness of 60 or more. Further, on one surface of the damping material 39 in the axial direction (one surface on the bolt 36A side), a recess 74 having an inner surface substantially the same shape as the head 47 of the bolt 36A is formed, and the recess 74 is formed. On the bottom surface of the bolt 36A, the cross groove 81 (a cross groove for engaging a Phillips screwdriver. In the case of a flat-blade screwdriver, a-groove may be used) corresponding to the cross groove 81 formed on the head 47 of the bolt 36A. The relief portion 82 for avoiding the 81 is further recessed and formed.

On the other hand, a protruding portion 84 projecting toward the filter circuit board 66 side is integrally formed at a position corresponding to the bolt 36A on the inner surface of the cover 11, and the surface of the protruding portion 84 facing the bolt 36A has good accuracy. It is a flat surface. When the cover 11 is attached to the housing 2, the axial dimension L1 of the damping material 39 is set to be smaller than the distance L2 between the protrusion 84 and the filter circuit board 66 (FIG. 4). , L1 <L2).

The damping material 39 is attached to the bolt 36A before closing the inverter accommodating portion 8 with the cover 11. At that time, the head 47 of the bolt 36A is attached in the recess 74 of the damping material 39, and the head 47 of the bolt 36A is surrounded by the damping material 39. As a result, the damping material 39 is positioned.

Further, in this state, the head 47 of the bolt 36A comes into contact with the bottom surface of the recess 74 of the damping material 39. As described above, the axial dimension L1 of the damping material 39 is set to be smaller than the distance L2 between the protrusion 84 and the filter circuit board 66. Therefore, when the inverter accommodating portion 8 is closed by the cover 11, the damping material 8 is closed. The other surface in the axial direction of 39 abuts on the protrusion 84, and one surface of the damping material 39 does not abut on the filter circuit board 66. Then, the damping material 39 is interposed between the head portion 47 of the bolt 36A and the protruding portion 84 of the cover 11. Further, since the relief portion 82 formed in the recess 74 of the damping material 39 in this state corresponds to the cross groove 81 of the head 47 of the bolt 36A, the damping material 39 does not abut on the cross groove 81. ..

In this way, in the inverter accommodating portion 8, the filter circuit board 66 of the inverter 10 is attached to the housing 2 by the bolt 36A, and the damping material 39 is arranged between the bolt 36A and the cover 11. Therefore, the housing Without forming a special structure on the two sides, a damping material 39 is interposed between the bolt 36A and the cover 11, and the vibration of the cover 11 can be damped to reduce noise.

In particular, since the vibration damping material 39 comes into contact with the head 47 of the bolt 36A for fixing the filter circuit board 66 of the inverter 10 to the housing 2, the vibration damping material 39 can be received by the bolt 36A. That is, since the damping material 39 does not come into contact with the filter circuit board 66, the load of the cover 11 is applied to the filter circuit board 66, and inconveniences such as damage to the board 66 can be avoided.

Here, when the damping material 39 is arranged between the bolt 36A and the cover 11, the bottom surface of the recess 74 of the damping material 39 comes into contact with the head 47 of the bolt 36A. Then, when the recess 74 of the damping material 39 comes into contact with the cross groove 81 formed in the head 47 of the bolt 36A, the damping material 39 in the portion corresponding to the cross groove 81 is distorted and concentrated, and the damping material 39 is damped. There is a risk that the vibration member 39 will be damaged, but in the embodiment, a relief portion 82 that avoids the cross groove 81 of the head 47 of the bolt 36A is formed on the bottom surface of the recess 74 of the vibration damping material 39. The inconvenience is also eliminated.

Further, in the embodiment, since the vibration damping material 39 is arranged so as to surround the bolt 36A, the vibration damping material 39 can be positioned by using the bolt 36A, and the assembly workability is improved. improves.

Further, in the embodiment, since the protruding portion 84 protruding toward the filter circuit board 66 side is integrally formed with the cover 11 at the position corresponding to the bolt 36A, the damping material 39 is brought into contact with the protruding portion 84 of the cover 11. As a result, the damping material 39 can be brought into contact with the cover 11 (protruding portion 84) without any trouble, and the dimensional accuracy of the protruding portion 84 is also improved, so that the load of the damping material 39 is stabilized. ..

Further, in the embodiment, since the vibration damping material 39 is made of an elastic material having an insulating property, the insulating property between the inverter control board 17 or the filter circuit board 66 of the inverter 10 and the cover 11 is also ensured. ..

Further, in the embodiment, since the vibration damping material 39 is made of an elastic material having a hardness of 60 or more, it is possible to exert a sufficient vibration damping effect on the cover 11.

Furthermore, in the embodiment, the cover 11 is fixed to the housing 2 at the peripheral edge portion, but since the damping material 39 is brought into contact with the cover 11 (protruding portion 84) near the center away from the peripheral edge portion. , The vibration of the cover 11 can be effectively damped by the damping material 39.

The shape / structure of the inverter 10 (inverter circuit unit 3 and filter circuit unit 4) and the housing 2 shown in the examples is not limited thereto, and can be variously changed without departing from the spirit of the present invention. Needless to say,

1 Electric compressor 2 Housing 3 Inverter circuit part 4 Filter circuit part 6 Motor 8 Inverter housing part 10 Inverter 11 Cover 12 Partition wall 13 Power switching element 14 Power module 16 Control circuit (circuit element)
17 Inverter control board (board)
36, 36A Bolt 39 Vibration damping material 41 Mounting hole 43 Bolt 47 Head 63 Smoothing capacitor (circuit element)
64 coil (circuit element)
66 Filter circuit board (board)
74 Recess 81 Cross groove (groove)
82 Relief part 84 Protruding part

Claims (7)

A metal housing containing a motor, an inverter for driving the motor, an inverter accommodating portion configured in the housing and accommodating the inverter, and an inverter accommodating portion fixed to the housing to block the inverter accommodating portion. In an electric compressor with a metal cover
The inverter has a substrate on which circuit elements are mounted, and the substrate is attached to the housing by bolts and is also attached.
An electric compressor characterized in that a damping material is arranged between the bolt and the cover. The bolt has a grooved head, and the damping material abuts on the head of the bolt and
The electric compressor according to claim 1, wherein the vibration damping material is formed with a relief portion for avoiding the groove. The electric compressor according to claim 1 or 2, wherein the vibration damping material is arranged so as to surround the bolt. The cover is integrally formed with a protruding portion protruding toward the substrate at a position corresponding to the bolt.
The electric compressor according to any one of claims 1 to 3, wherein the vibration damping material comes into contact with a protruding portion of the cover. The electric compressor according to any one of claims 1 to 4, wherein the vibration damping material is made of an elastic material having an insulating property. The electric compressor according to any one of claims 1 to 5, wherein the vibration damping material is made of an elastic material having a hardness of 60 or more. The cover is fixed to the housing at the peripheral edge and is fixed to the housing.
The electric compressor according to any one of claims 1 to 6, wherein the vibration damping material comes into contact with the cover at a position separated from the peripheral edge portion.

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