JP2013249741A - Motor-driven compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven compressor capable of restraining noise leakage via a seal member while providing a preferable cooling property of a motor driving circuit.SOLUTION: A cylindrical part 43a of a shield part 43 is disposed inside a seal member 51 while extending toward a bottom wall 12a. The top end 431a side in an outer circumferential surface 432a of the cylindrical part 43a is contacted with the inner circumferential surface of a flange part 12f.

Description

  The present invention relates to an electric compressor.

  The electric compressor has a housing made of a metal material that houses a compression portion that compresses and discharges the refrigerant and an electric motor that drives the compression portion, and a motor drive circuit for driving the electric motor in the housing A cover for defining a housing space for housing the housing is attached. A seal member is interposed between the housing and the cover. The seal member prevents dust and water from entering the housing space through the housing and the cover.

  By the way, if the cover is made of a metal material, the electric compressor itself becomes heavy. Therefore, it is considered to reduce the weight of the cover by making the cover resin, and to suppress the increase in the weight of the electric compressor itself as much as possible. However, if the cover is made of resin, noise from the outside may flow to the motor drive circuit through the cover, or noise from the motor drive circuit may leak to the outside through the cover.

  Therefore, the inverter case (cover) of Patent Document 1 has a main body formed of a resin, and metal plating is performed on the inside thereof by insert molding or the like. As described above, since the metal plating is applied to the inside of the main body of the inverter case, noise from the outside is blocked by the metal plating and enters the accommodation space through the main body formed of resin. It is suppressed. In addition, it is possible to prevent noise from the motor drive circuit from being blocked by metal plating and leaking outside through a main body formed of resin.

JP 2002-155862 A

  However, as in Patent Document 1, even if the main body is made of resin and the cover is metal-plated on the inner side of the main body, noise from the outside may enter the accommodation space via the seal member. There is a risk of intrusion and flow into the motor drive circuit, or noise from the motor drive circuit leaking to the outside through the seal member.

  In addition, heat is generated from the motor drive circuit, and heat generated from the motor drive circuit is transmitted to the cover. Here, as in Patent Document 1, a cover whose body is formed of resin is less likely to dissipate heat than a cover made of a metal material. In particular, since a seal member is interposed between the cover and the housing, it is difficult for heat transferred from the motor drive circuit to the cover to be radiated to the housing. As a result, the cooling performance of the motor drive circuit accommodated in the accommodation space is deteriorated.

  The present invention has been made to solve the above-described problems, and the object thereof is to suppress noise leakage through the seal member and to improve the cooling performance of the motor drive circuit. An object of the present invention is to provide an electric compressor.

  In order to achieve the above object, according to the first aspect of the present invention, the compression unit and the electric motor are accommodated in a housing made of a metal material, and the housing is partitioned by the housing and a cover attached to the housing. A motor drive circuit for driving the electric motor is accommodated in the space, and the cover is composed of a resin part and a shield part made of a metal material that shields electromagnetic noise, and the housing and the cover An electric compressor in which a sealing member having elasticity is interposed therebetween, wherein the shield portion is provided with an extending portion that extends toward the housing and is disposed inside the sealing member, The gist is that the extending portion is in contact with the housing.

  According to the present invention, compared to the case where the extended portion is not disposed inside the seal member, noise from the outside via the seal member is easily blocked by the extended portion, and is directed from the motor drive circuit to the seal member. Since noise is easily blocked by the extending portion, noise leakage through the seal member can be suppressed. Further, as compared with the case where the extended portion is not brought into contact with the housing, the heat transmitted from the motor drive circuit to the cover can be radiated to the housing via the extended portion. As a result, the cooling performance of the motor drive circuit accommodated in the accommodation space can be improved.

The gist of the invention according to claim 2 is that, in the invention according to claim 1, the extending portion has a spring property.
According to the present invention, when the cover is assembled to the housing, the extension portion bends so that the dimensional tolerance between the housing and the cover can be absorbed. Therefore, the extension portion is easily brought into contact with the housing. Furthermore, the assembly of the cover and the housing can be facilitated.

The gist of the invention according to claim 3 is that, in the invention according to claim 1 or 2, the extending portion is provided over the entire inner circumferential surface of the seal member.
According to the present invention, it is possible to easily suppress noise leakage through the seal member as compared with the case where the extending portion is provided on a part of the inner peripheral surface of the seal member, and the motor drive circuit. It is possible to easily dissipate the heat transferred from the cover to the cover to the housing through the extending portion.

  According to the present invention, noise leakage through the seal member can be suppressed, and the cooling performance of the motor drive circuit can be improved.

(A) is a fragmentary sectional view which shows the electric compressor in embodiment, (b) is sectional drawing which expanded the cover periphery partially. FIG. 1B is a sectional view taken along line 1-1 in FIG. Sectional drawing which expanded a cover periphery in another embodiment partially.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1 (a), the housing H of the electric compressor 10 is made of aluminum (made of a metal material) having a bottomed cylindrical shape to a discharge housing 11 made of aluminum (made of a metal material) having a covered cylindrical shape. The suction housing 12 is joined. A suction port (not shown) is formed on the peripheral wall of the suction housing 12, and the suction port is connected to an external refrigerant circuit (not shown). A discharge port 14 is formed in the discharge housing 11, and the discharge port 14 is connected to an external refrigerant circuit. In the suction housing 12, a compression unit 15 (shown by a broken line in FIG. 1A) for compressing the refrigerant and an electric motor 16 for driving the compression unit 15 are accommodated. In the present embodiment, although not particularly illustrated, the compression unit 15 is composed of a fixed scroll fixed in the suction housing 12 and a movable scroll disposed to face the fixed scroll.

  A stator 17 (stator) is fixed to the inner peripheral surface of the suction housing 12, and the stator 17 has a coil 17 b wound around a tooth (not shown) of a stator core 17 a fixed to the inner peripheral surface of the suction housing 12. It is configured to be turned. A rotation shaft 19 is rotatably supported in the suction housing 12 while being inserted into the stator 17, and a rotor 18 (rotor) is fixed to the rotation shaft 19.

  As shown in FIG. 1B, the bottom wall 12a of the suction housing 12 is outwardly extended along the direction (axial direction) in which the axis L of the rotary shaft 19 extends from the entire outer periphery of the bottom wall 12a. An annular flange 12f extending to the right side of (b) is formed. A cover 41 having a covered cylindrical shape is attached to the opening end side of the flange portion 12f. The housing space 41a is partitioned by the bottom wall 12a, the flange portion 12f, and the cover 41. A motor drive circuit 40 for driving the electric motor 16 is housed in the housing space 41a. The motor drive circuit 40 is attached to the bottom wall 12a in the accommodation space 41a. Therefore, in this embodiment, the compression part 15, the electric motor 16, and the motor drive circuit 40 are arranged in this order along the axial direction of the rotating shaft 19.

  The cover 41 is formed of a resin part 42 that forms a covered cylinder and forms the main body of the cover 41, and a shield part 43 made of aluminum (made of a metal material) that has a thin plate shape. The cover 41 is molded from a resin material with the shield portion 43 as a core. Therefore, the cover 41 is mainly made of a resin material. The shield part 43 is disposed inside the resin part 42.

  The resin part 42 is a ring-shaped outer peripheral part forming cylinder part 42a extending along the axial direction of the rotating shaft 19, and a direction continuous to the outer peripheral part forming cylinder part 42a and orthogonal to the extending direction of the outer peripheral part forming cylinder part 42a. Are formed with a lid forming portion 42b that extends along the axis of the rotating shaft 19 and an annular connector forming portion 42c that is continuous with the lid forming portion 42b and extends along the axial direction of the rotary shaft 19.

  The shield portion 43 includes an annular tube portion 43a that extends along the axial direction of the rotary shaft 19, a lid portion 43b that extends along the direction orthogonal to the extending direction of the tube portion 43a while continuing to the tube portion 43a. It is formed of an annular connector portion 43 c that is continuous with the lid portion 43 b and extends along the axial direction of the rotary shaft 19. The cylindrical portion 43a extends along the inner peripheral surface of the outer peripheral portion forming cylindrical portion 42a of the resin portion 42. The lid portion 43 b extends along the inner bottom surface of the lid forming portion 42 b of the resin portion 42. The connector part 43 c extends along the inner peripheral surface of the connector forming part 42 c of the resin part 42. Therefore, the shield part 43 is arranged over the entire inside of the resin part 42 and blocks (shields) noise (electromagnetic noise) via the resin part 42.

  Inside the connector part 43c, a holding part 45 made of a resin material is provided in an integrated state with the connector part 43c. The holding portion 45 holds a metal terminal 46 that is electrically connected to an external power source (not shown). The metal terminal 46 is electrically connected to the motor drive circuit 40.

  Between the opening end of the flange portion 12f and the opening end of the outer peripheral portion forming cylinder portion 42a, an elastic rubber material seal member 51 is interposed. The seal member 51 has an annular shape. Further, the cylindrical portion 43 a of the shield portion 43 extends toward the bottom wall 12 a (suction housing 12) and is disposed inside the seal member 51. Therefore, in the present embodiment, the cylindrical portion 43 a corresponds to an extending portion disposed inside the seal member 51, and the extending portion is provided in the shield portion 43. The distal end 431a of the cylindrical portion 43a protrudes toward the bottom wall 12a from the end surface 511 of the seal member 51 on the flange 12f side. And the front-end | tip 431a side in the outer peripheral surface 432a of the cylinder part 43a is contacting (contact | abutting) the inner peripheral surface of the collar part 12f.

  As shown in FIG. 2, the cylindrical portion 43 a is provided over the entire inner peripheral surface 51 a of the seal member 51. The outer peripheral surface 432a of the cylindrical portion 43a is in contact with the inner peripheral surface 51a of the seal member 51. The seal member 51 is mounted around the cylindrical portion 43a by elastically deforming radially outward. By contact between the outer peripheral surface 432a of the cylindrical portion 43a and the inner peripheral surface 51a of the sealing member 51, the sealing member 51 is closely disposed along the outer peripheral surface 432a of the cylindrical portion 43a, and the sealing member 51 is disposed on the periphery of the accommodation space 41a. The shape is held along. In the seal member 51, the inner diameter before the elastic deformation is smaller than the outer diameter of the cylindrical portion 43a.

Next, the operation of this embodiment will be described.
A distal end 431a in the extending direction of the cylindrical portion 43a protrudes toward the bottom wall 12a side from the end surface 511 of the seal member 51 on the flange portion 12f side. Thereby, noise from the outside via the seal member 51 is blocked by the cylinder portion 43a, and noise from the motor drive circuit 40 toward the seal member 51 is also blocked by the cylinder portion 43a. Noise leakage is suppressed. Moreover, the front-end | tip 431a side in the outer peripheral surface 432a of the cylinder part 43a is contacting the inner peripheral surface of the collar part 12f. Thereby, the heat transmitted from the motor drive circuit 40 to the shield part 43 is radiated to the housing H through the cylinder part 43a.

In the above embodiment, the following effects can be obtained.
(1) The cylindrical portion 43 a of the shield portion 43 is extended toward the bottom wall 12 a so as to be disposed inside the seal member 51. Thereby, compared with the case where the cylinder part 43a is not arrange | positioned inside the sealing member 51, while the noise from the outside via the sealing member 51 becomes easy to be interrupted | blocked by the cylinder part 43a, the sealing member from the motor drive circuit 40 is easy. Since noise toward 51 is easily blocked by the cylindrical portion 43a, noise leakage through the seal member 51 can be suppressed. Moreover, the front-end | tip 431a side in the outer peripheral surface 432a of the cylinder part 43a was made to contact | abut to the inner peripheral surface of the collar part 12f. Therefore, the heat transmitted from the motor drive circuit 40 to the shield part 43 can be radiated to the housing H through the cylinder part 43a. As a result, the cooling performance of the motor drive circuit 40 accommodated in the accommodation space 41a can be improved.

  (2) The cylinder portion 43 a is provided over the entire inner peripheral surface 51 a of the seal member 51. Therefore, compared with the case where the cylinder part 43a is provided in a part of the inner peripheral surface 51a of the seal member 51, noise leakage through the seal member 51 can be easily suppressed, and the motor drive circuit 40 can be suppressed. It is possible to easily dissipate the heat transmitted from the shield part 43 to the housing H through the cylinder part 43a.

  (3) A cylindrical portion 43 a corresponding to the extended portion is formed in the shield portion 43. According to this, in addition to suppression of noise leakage through the resin portion 42, noise leakage through the seal member 51 can be suppressed by the shield portion 43. Therefore, it is simpler to provide the extended portion in the shield portion 43 than to provide the extended portion in the housing H.

  (4) The outer peripheral surface 432 a of the cylinder portion 43 a is brought into contact with the inner peripheral surface 51 a of the seal member 51. Therefore, the contact between the outer peripheral surface 432a of the cylindrical portion 43a and the inner peripheral surface 51a of the seal member 51 causes the seal member 51 to be closely attached along the outer peripheral surface 432a of the cylindrical portion 43a, and the seal member 51 is the peripheral edge of the accommodation space 41a. It is held in a shape along. For this reason, it is possible to easily ensure the sealing performance between the opening end of the flange portion 12f and the opening end of the outer peripheral portion forming cylinder portion 42a.

  (5) According to the present embodiment, the heat transmitted to the shield part 43 can be dissipated to the housing H via the cylinder part 43a, so that the electronic component that is a heating element constituting the motor drive circuit 40 is It becomes possible to arrange | position to the cover 41 side in the accommodation space 41a. Therefore, the degree of freedom of layout in the electronic component is improved.

  (6) The cylindrical portion 43 a corresponding to the extending portion is disposed inside the seal member 51. Therefore, since the extending portion is not arranged outside the seal member 51, the shapes of the outer peripheral side of the housing H and the outer peripheral side of the cover 41 are not complicated in the electric compressor 10.

In addition, you may change the said embodiment as follows.
○ As shown in FIG. 3, the tip 431a side of the cylindrical portion 43a may have a spring property. On the distal end 431a side of the cylindrical portion 43a, there is a bent portion 61 that bends inward of the cylindrical portion 43a, and the distal end 431a side of the cylindrical portion 43a with respect to the bent portion 61, and is arcuate so as to bulge outside the cylindrical portion 43a. And an arcuate curved portion 62 that is curved in a straight line. When the outer side of the arcuate curved portion 62 comes into contact with the inner peripheral surface of the flange portion 12f, the distal end 431a side of the cylindrical portion 43a is bent toward the inner side of the cylindrical portion 43a with the bent portion 61 side as a base point. According to this, when assembling the cover 41 to the suction housing 12, since the distal end 431 a side of the cylindrical portion 43 a bends, the dimensional tolerance between the suction housing 12 and the cover 41 can be absorbed. It is possible to facilitate contact with the flange portion 12f, and it is possible to facilitate the assembly of the cover 41 and the suction housing 12.

  In the embodiment, for example, a cylindrical member corresponding to the extending portion may be formed separately from the cover 41. For example, the cylindrical member corresponding to the extending portion may be provided on the cover 41 by assembling the cylindrical member to the cylindrical portion 43a.

  In the embodiment, the distal end 431a in the extending direction of the cylindrical portion 43a may extend to the same position as the end surface 511 of the seal member 51 on the flange 12f side. That is, the cylinder part 43a should just extend to the position which covers the inner peripheral surface 51a of the seal member 51 at least.

  In embodiment, the cylinder part 43a may be provided in a part of inner peripheral surface 51a of the sealing member 51. FIG. In this case, the cylinder part 43a should just be provided in the location which has the influence of noise in the internal peripheral surface 51a of the sealing member 51. FIG.

In embodiment, the cylinder part 43a does not need to contact the inner peripheral surface 51a of the seal member 51.
In the embodiment, the motor drive circuit 40 may be attached to the cover 41 in the accommodation space 41a.

In embodiment, the cover 41 may be attached to the outer peripheral surface of the suction | inhalation housing 12, for example.
In embodiment, although the cover 41 was shape-molded with the resin material by making the shield part 43 into a core metal, it is not restricted to this. For example, a locking projection is formed in the resin portion 42, and a locking hole capable of locking the locking projection is formed in the shield portion 43. By locking the locking projection in the locking hole, The cover 41 may be configured by assembling the resin portion 42 and the shield portion 43.

In the embodiment, the shield part 43 may be a conductive material such as iron or copper, for example.
In embodiment, although the compression part 15, the electric motor 16, and the motor drive circuit 40 were arrange | positioned along with the axial direction of the rotating shaft 19 in this order, the order of arrangement | positioning is not limited to this. For example, the motor drive circuit, the compression unit, and the electric motor may be arranged in this order along the axial direction of the rotating shaft 19.

In the embodiment, the compression unit 15 may be, for example, a piston type or a vane type.
Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.

  (A) A rotating shaft that rotates integrally with a rotor constituting the electric motor is housed in the housing, and the compression portion, the electric motor, and the motor drive circuit are arranged in this order in the axial direction of the rotating shaft. The electric compressor according to any one of claims 1 to 3, wherein the electric compressor is arranged side by side.

  H: Housing, 10: Electric compressor, 15: Compression section, 16: Electric motor, 18 ... Rotor, 19 ... Rotating shaft, 40 ... Motor drive circuit, 41 ... Cover, 41a ... Storage space, 42 ... Resin section, 43 ... Shield part, 43a ... Cylinder part corresponding to the extended part, 51 ... Seal member, 51a ... Inner peripheral surface.

Claims (3)

A compression unit and an electric motor are accommodated in a housing made of a metal material, and a motor drive circuit for driving the electric motor is accommodated in an accommodation space defined by the housing and a cover attached to the housing, The cover is an electric compressor that includes a resin part and a shield part made of a metal material that shields electromagnetic noise, and an elastic seal member is interposed between the housing and the cover. ,
The shield portion is provided with an extending portion that extends toward the housing and is disposed inside the seal member.
The electric compressor according to claim 1, wherein the extending portion is in contact with the housing.   The electric compressor according to claim 1, wherein the extending portion has a spring property.   The electric compressor according to claim 1, wherein the extending portion is provided over the entire inner peripheral surface of the seal member.