JP2012107565A - Electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance sealability between the inside of a housing and a storage space for an inverter.SOLUTION: A sealing terminal 51 is configured to insert a metal terminal 43 through the inserting hole 42a of a bolt 42 and use a first and second insulating members 44, 45 to insulate between the bolt 42 and the metal terminal 43. With a gasket 48 being arranged on a bottom wall 12a, the bolt 42 of the sealing terminal 51 is screwed into a female screw hole 41, so that the gasket 48 is pressed against the bottom wall 12a by the head part 422 to be elastically deformed and held between the bottom wall 12a and the head part 422.

Description

  The present invention relates to an electric compressor.

  The electric compressor has a housing that houses a compression unit that compresses and discharges a refrigerant and an electric motor that drives the compression unit, and one end wall (partition wall) of the housing has a box-like shape that is open on one side. The inverter cover is fixed. The housing and the inverter cover (accommodating space) are partitioned by the one end wall of the housing. An inverter for driving the electric motor is accommodated in the accommodating space, and the electric motor and the inverter are electrically connected via a sealed terminal. The sealing terminal is fitted into a through-hole formed in one end wall of the housing, and an insulating member that seals while ensuring insulation between the conductive member that electrically connects the electric motor and the inverter and the one end wall. Have. As an electric compressor using such a sealed terminal, for example, Patent Document 1 is cited.

  As shown in FIG. 3, in the electric compressor of Patent Document 1, the partition wall 82 (partition wall) of the suction housing 81 is formed with a protruding portion 83 that protrudes outside the suction housing 81. The protrusion 83 and the partition wall 82 are formed with a through hole 84 that allows the inside of the suction housing 81 to communicate with the outside of the suction housing 81. The through hole 84 includes a screw portion 84a formed on the tip end side of the projecting portion 83, a hole 84b continuous with the screw portion 84a, and a hole 84c continuous with the hole 84b. A bottom portion 84d is provided on the suction housing 81 side of the hole 84b, and an inclined portion 84e whose diameter decreases toward the bottom portion 84d is provided on the hole 84b. Further, the hole 84c is formed in a hole shape through which one end side 85 of the stator coil of the electric motor can be inserted.

  In the through hole 84, the plug member 86 (seal member) is accommodated in the hole 84 b, and the outer diameter of the plug member 86 is slightly larger than the diameter of the hole 84 b. The plug member 86 is formed with a through hole 86a through which the one end side 85 of the stator coil is inserted. A bolt 87 that presses the plug member 86 toward the suction housing 81 is screwed into the screw portion 84a. Further, the bolt 87 is formed with a through hole 87 a through which the one end side 85 of the stator coil is inserted along the axial direction of the bolt 87.

  The plug member 86 is supported by the bottom portion 84d by the bolt 87, and the plug member 86 is brought into close contact with the inclined portion 84e, whereby the gap between the plug member 86 and the through hole 84 is sealed, and the plug member 86 86 seals between the through hole 86a and one end side 85 of the stator coil, and seals between the through hole 86a and one end side 85 of the stator coil.

JP 2009-203902 A

  However, in the electric compressor of Patent Document 1, the seal between the plug member 86 and the through hole 84 is an inclined portion of the plug member 86 when the plug member 86 is pressed toward the suction housing 81 by the bolt 87. This is based on the elastic deformation toward 84e and may have a low sealing performance.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electric compressor capable of improving the sealing performance between the inside of the housing and the accommodation space of the inverter.

  In order to achieve the above object, according to a first aspect of the present invention, a compressor and an electric motor are housed in a housing, and an inverter for driving the electric motor is isolated from the housing by a partition wall. And an electric compressor having a sealing terminal that electrically connects the electric motor and the inverter, wherein the sealing terminal is screwed into a female screw hole formed in the partition wall. The bolt has an insertable hole through which a conductive member for electrically connecting the electric motor and the inverter can be inserted, and the bolt and the conductive member are insulated by an insulating member. A seal member is provided between the partition and the head of the bolt to seal between the housing and the housing space. In addition, as the bolt is screwed into the female screw hole, the head of the bolt presses the seal member toward the partition, so that the seal member is connected to the partition and the head. The gist is that it is sandwiched between them.

  According to the present invention, the sealing member is elastically deformed by being pressed toward the partition wall by the head as the bolt of the sealing terminal is screwed into the female screw hole with the seal member disposed on the partition wall. It is clamped between the bulkhead and the head in a state. Therefore, the seal member is pressed so as to be in close contact with the partition wall, and the sealing performance between the inside of the housing and the accommodation space can be improved.

  According to a second aspect of the present invention, in the first aspect of the present invention, a plurality of the female screw holes are formed in the partition wall, and the sealing terminal is fixed to each female screw hole. The gist is that the insertion hole is formed at a position corresponding to the female screw hole.

  According to this invention, compared with the case where one seal member is provided at a position corresponding to each female screw hole in the partition wall, the inside of the housing and the accommodation space at the position corresponding to each female screw hole by one member. The gap can be sealed, and the number of parts can be reduced.

  According to this invention, the sealing performance between the housing and the accommodation space of the inverter can be enhanced.

(A) is the fragmentary longitudinal cross-section which shows the electric compressor in embodiment, (b) is the longitudinal cross-sectional view which expanded the sealing terminal periphery. The perspective view around a sealing terminal. Sectional drawing which expands and shows the plug member periphery of the electric compressor of a prior art example.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1A, the housing of the electric compressor 10 is formed by joining a bottomed cylindrical suction housing 12 to a left-side covered cylindrical discharge housing 11 in FIG. A suction port 13 is formed on the bottom side of the peripheral wall of the suction housing 12 (upper right side in FIG. 1). The suction port 13 is connected to an external refrigerant circuit (not shown). A discharge port 14 is formed on the lid side of the discharge housing 11 (left side in FIG. 1A), 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. The starting ends of the U-phase, V-phase, and W-phase conductive windings 20 are drawn from the coil end of the coil 17b and are electrically connected to input terminals (not shown). Three wires corresponding to the U phase, the V phase, and the W phase extend from the input terminal. 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.

  On the bottom wall 12a of the suction housing 12 (on the right side of FIG. 1 (a)), a box-shaped aluminum inverter cover 31 having an open surface is fixed, and the bottom wall 12a and the inverter cover 31 The accommodation space 31a is partitioned. Therefore, the bottom wall 12a of the suction housing 12 functions as a partition wall that partitions the suction housing 12 and the accommodation space 31a. An inverter 32 (indicated by a two-dot chain line in FIG. 1A) is accommodated in the accommodation space 31a isolated from the suction housing 12.

  In the electric compressor 10 having the above-described configuration, the electric power controlled by the inverter 32 is supplied to the electric motor 16, whereby the rotating shaft 19 is rotated together with the rotor 18 at the controlled rotation speed, and the compression unit 15 is driven. It has become so. By driving the compression unit 15, the refrigerant is sucked into the suction housing 12 from the external refrigerant circuit through the suction port 13, the refrigerant sucked into the suction housing 12 is compressed by the compression unit 15, and the compressed refrigerant is Discharge to the external refrigerant circuit via the discharge port 14 is performed.

  As shown in FIG. 1 (b), three female screw holes 41 are formed in the bottom wall 12 a of the suction housing 12. Then, the sealing terminal 51 is fixed to the female screw hole 41 by screwing the bolt 42 of the sealing terminal 51 into each female screw hole 41 from the accommodation space 31a side. The bolt 42 of the sealing terminal 51 includes a shaft portion 421 on which a male screw 42 b is formed, and a head portion 422 protruding from one end of the shaft portion 421. As a result, the bolt 42 is fixed to the female screw hole 41.

  Each bolt 42 is formed with an insertion hole 42a penetrating the bolt 42 in the axial direction. The insertion hole 42a includes a first holding part 421a on the head part 422 side and a second holding part 422a on the shaft part 421 side whose inner diameter is smaller than that of the first holding part 421a. A first insulating member 44 made of ceramic is held by the first holding portion 421a, and a second insulating member 45 made of glass is held by the second holding portion 422a.

  In addition, a rod-shaped metal terminal 43 as a conductive member is inserted inside the first and second insulating members 44 and 45, and the head 422 and the metal terminal 43 are insulated by the first insulating member 44. The metal terminal 43 and the shaft portion 421 are insulated from each other by the second insulating member 45. Therefore, the first and second insulating members 44 and 45 function as insulating members that insulate between the bolts 42 and the metal terminals 43. One end of the metal terminal 43 is located in the suction housing 12 and is electrically connected to the input terminal on the electric motor 16 side. The other end is located in the accommodation space 31a and is electrically connected to the inverter 32 via the cable 33. It is connected to the.

  The sealing terminal 51 holds the first insulating member 44 fitted to the first holding portion 421a, and the metal terminal 43 is inserted inside the first insulating member 44 so that the metal terminal 43 and the second holding portion 422a By filling the glass material in between to integrate the metal terminal 43 and the second insulating member 45, the space between the metal terminal 43 and the insertion hole 42a is sealed. Accordingly, the metal terminal 43, the first insulating member 44, the second insulating member 45, and the bolt 42 constitute a sealed terminal 51.

  As shown in FIG. 2, an elastic thin plate-like gasket 48 is disposed on the outer surface of the bottom wall 12a of the suction housing 12 as a seal member. As shown in FIG. 1B, the gasket 48 is formed with three insertion holes 48 a through which the respective bolts 42 are penetrated and screwed into the female screw holes 41. Then, the bolts 42 are screwed into the female screw holes 41 through the insertion holes 48a, so that the peripheral portions of the insertion holes 48a in the gasket 48 are pressed against the bottom wall 12a by the heads 422. It is sandwiched between each head 422 and the bottom wall 12 a of the suction housing 12.

Next, the operation of the electric compressor 10 will be described.
When the bolt 42 of the sealing terminal 51 is screwed into the female screw hole 41 of the bottom wall 12a, the peripheral edge portion of the insertion hole 48a in the gasket 48 is pressed toward the bottom wall 12a of the suction housing 12 by the head 422. The peripheral portion of the gasket 48 is compressed while being pressed toward the bottom wall 12a by the pressing by the head 422, and as a result of being pressed against the bottom wall 12a, the gap between the gasket 48 and the bottom wall 12a is obtained. Is sealed. Here, due to the difference between the pressure in the suction housing 12 and the pressure in the storage space 31 a, the refrigerant in the suction housing 12 is directed toward the storage space 31 a through the space between the female screw holes 41 and the bolts 42. Try to flow. However, in this embodiment, since the gasket 48 is in close contact with the bottom wall 12a, the gasket 48 tends to flow toward the accommodation space 31a via the gaps between the female screw holes 41 and the bolts 42. The refrigerant is prevented from leaking from between the gasket 48 and the bottom wall 12a. As a result, the refrigerant is prevented from entering the housing space 31a from the inside of the suction housing 12.

In the above embodiment, the following effects can be obtained.
(1) The sealing terminal 51 is formed so that the metal terminal 43 is inserted into the insertion hole 42 a of the bolt 42 and the bolt 42 and the metal terminal 43 are insulated by the first and second insulating members 44 and 45. . Then, with the gasket 48 provided on the bottom wall 12a, the gasket 48 is pressed toward the bottom wall 12a by the head 422 as the bolt 42 of the sealing terminal 51 is screwed into the female screw hole 41. And sandwiched between the bottom wall 12a and the head 422 in an elastically deformed state. Therefore, the gasket 48 is pressed so as to be in close contact with the bottom wall 12a, and the sealing performance between the suction housing 12 and the accommodation space 31a can be enhanced.

  (2) Insertion holes 48 a are formed in the gasket 48 at positions corresponding to the respective female screw holes 41. Therefore, compared with the case where one seal member is provided at a position corresponding to each female screw hole 41 on the bottom wall 12a, the inside of the suction housing 12 and the accommodation space at a position corresponding to each female screw hole 41 with one member. It is possible to seal between 31a and reduce the number of parts.

  (3) Bolts 42 are screwed into the respective female screw holes 41. Then, when each bolt 42 is screwed into each female screw hole 41 in a state where the gasket 48 is disposed on the bottom wall 12 a of the suction housing 12, each head 422 starts to press the gasket 48. Since the work of screwing the bolt 42 into the female screw hole 41 is caused by the pressing of each head 422 against the gasket 48, the tightening allowance for tightening the bolt 42 into the female screw hole 41 according to the load is generated. Can be adjusted. As a result, it can be confirmed whether or not the space between the suction housing 12 and the accommodation space 31a is reliably sealed by the gasket 48.

  (4) The bolt 42 of the sealing terminal 51 can be screwed into each female screw hole 41. Therefore, the sealing terminal 51 constituted by the metal terminal 43, the first insulating member 44, the second insulating member 45, and the bolt 42 is fixed to the female screw hole 41 by screwing the bolt 42 into the female screw hole 41. be able to. Therefore, it is not necessary to prevent the sealing terminal 51 from coming off from the female screw hole 41, for example, using a circlip, and the number of parts can be reduced.

  (5) The metal terminal 43 and the insertion hole 42a of the bolt 42 are sealed and insulated by the first insulating member 44 made of ceramic and the second insulating member 45 made of glass. Since ceramics and glass have heat resistance, the first and second insulating members 44 and 45 are prevented from deteriorating due to heat generated from the metal terminal 43, and the sealing performance between the metal terminal 43 and the insertion hole 42a is good. Can be.

  (6) The second insulating member 45 and the metal terminal 43 are integrated by filling the second insulating member 45 made of glass between the metal terminal 43 and the insertion hole 42 a of the bolt 42. Therefore, even if the pressure in the suction housing 12 is applied to the metal terminal 43, the metal terminal 43 can be made difficult to be removed from the second insulating member 45 by the pressure in the suction housing 12.

In addition, you may change the said embodiment as follows.
In the embodiment, one seal member may be provided at a position corresponding to each female screw hole 41 in the bottom wall 12a.

In the embodiment, the gasket 48 may be integrally attached to the shaft portion 421 in advance.
In the embodiment, the first insulating member 44 and the second insulating member 45 may be a single member. In this case, the material may be glass, ceramics, or other insulating material, and the material of the insulating member is not particularly limited as long as it has insulating properties.

  In the embodiment, the U-phase, V-phase, and W-phase conductive windings 20 drawn from the coil end may be inserted inside the insertion hole 42a. In this case, each conductive winding 20 functions as a conductive member.

In the embodiment, the sealing terminal 51 may be fixed to the female screw hole 41 by screwing the bolt 42 into the female screw hole 41 from the suction housing 12 side.
In embodiment, the compression part 15 is not restricted to the type comprised by a fixed scroll and a movable scroll, For example, a piston type, a vane type, etc. may be sufficient.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(A) The electric compressor according to claim 1 or 2, wherein the conductive member is a rod-shaped metal terminal.

  (B) An electric motor that is housed in the housing and drives the compression unit, and an inverter that is disposed in the housing space separated from the housing by a partition and drives the electric motor. A sealing terminal used to connect the electric motor, a bolt that can be screwed into a female screw hole formed in the partition, a conductive member that electrically connects the electric motor and the inverter, and the bolt An insulating member that insulates the conductive member, and a seal member that is disposed between the partition wall and the head of the bolt and seals between the inside of the housing and the accommodating space. Sealed terminal.

  DESCRIPTION OF SYMBOLS 10 ... Electric compressor, 11 ... Discharge housing which forms housing, 12 ... Inhalation housing which forms housing, 12a ... Bottom wall which functions as a partition, 15 ... Compression part, 16 ... Electric motor, 31a ... Storage space, 32 ... Inverter, 41 ... female screw hole, 42 ... bolt, 42a ... insertion hole, 422 ... head, 43 ... metal terminal as conductive member, 44 ... first insulating member as insulating member, 45 ... second insulation as insulating member 48, a gasket as a sealing member, 48a, an insertion hole, 51, a sealing terminal.

Claims (2)

A compression unit and an electric motor are housed in the housing, and an inverter for driving the electric motor is disposed in a housing space separated from the inside of the housing by a partition wall, and further, the electric motor and the inverter An electric compressor having a sealed terminal for electrically connecting
The sealing terminal has a bolt that can be screwed into a female screw hole formed in the partition wall, and the bolt has an insertion hole into which a conductive member that electrically connects the electric motor and the inverter can be inserted. Furthermore, the bolt and the conductive member are insulated by an insulating member,
Between the partition wall and the head portion of the bolt, a seal member that seals the inside of the housing and the accommodation space is disposed, and the bolt is screwed into the female screw hole. Accordingly, the head of the bolt presses the seal member toward the partition, so that the seal member is sandwiched between the partition and the head. A plurality of the female screw holes are formed in the partition wall, and the sealing terminal is fixed to each female screw hole,
The electric compressor according to claim 1, wherein an insertion hole is formed in the seal member at a position corresponding to each female screw hole.

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