WO2016067764A1

WO2016067764A1 - Electrically driven compressor

Info

Publication number: WO2016067764A1
Application number: PCT/JP2015/075546
Authority: WO
Inventors: 箕輪　昌賢; 雄二郎森田
Original assignee: 株式会社ヴァレオジャパン
Priority date: 2014-10-28
Filing date: 2015-09-09
Publication date: 2016-05-06
Also published as: JP6370677B2; JP2016084768A

Abstract

[Problem] To provide an electrically driven compressor configured so that an electric motor-side connector and a terminal can be connected without causing the interference between members and so that an installation space around the connection members can be ensured. [Abstract] An electrically driven compressor 1 comprises within a housing 2, a compression mechanism 4, an electric motor 3 which drives the compression mechanism 4, and an inverter 30 which controls and drives the electric motor 3. An electric motor receiving section 5c and an inverter receiving section 5b are separated by a partition wall 5a, a terminal 7 is affixed to a through-hole 9 formed in the partition wall 5a, and an electric motor-side connector 8 connected to the inverter 30 through a cable 11 and an electric motor-side connector connected to the electric motor 3 through a cable are connected to the terminal 7, thereby electrically connecting the inverter 30 to the electric motor 3 through the terminal 7. The electric motor-side connector 8 is constituted by three connection terminals 72a, 72b, 72c which are formed independently of each other.

Description

Electric compressor

The present invention relates to an electric compressor, and more particularly to a structure for electrically connecting an electric motor and an inverter.

Conventionally, in an electric compressor in which a compression mechanism and an electric motor are housed in a housing, an inverter for driving and controlling the electric motor is required, and this inverter forms an enclosure for the refrigerant gas inflow path (forms an enclosure for the electric motor enclosure). In this configuration, the housing is integrally mounted with a partition wall therebetween, and power is supplied from the inverter device to the electric motor via a terminal provided on the partition wall.

As a configuration of such a terminal, as shown in Patent Document 1, a main body portion having three terminal pins penetrated and fixed to one portion of a partition wall is attached, and an inverter connected via a cable to an inverter circuit A configuration in which the inverter circuit and the stator are electrically connected by mounting the side connector and the motor side connector connected to the stator of the motor via a cable from a direction opposite to the terminal pins is often used.

In addition, there are terminals in which terminal pins of the terminals are arranged in a row. For example, as shown in Patent Document 2, a plurality of female terminals are arranged at positions aligned or shifted with respect to the insertion direction of the male terminals. A motor-integrated compressor is disclosed.

JP 2012-112274 A Japanese Patent Laid-Open No. 2006-042409

By the way, the motor side connector described in

Patent Documents

1 and 2 has a configuration in which each wiring is provided in order to connect three lead wires simultaneously.

For example, the terminal described in Patent Document 1 is arranged at a position where three terminal pins are spaced apart from each other by a distance (a position forming a triangle) and formed according to the shape of the terminal pin. The motor side connector is used.

In the connection structure disclosed in Patent Document 1, since the three terminal pins are configured to form a triangle, a predetermined width in the radial direction for arrangement is required. Furthermore, since the wiring direction of the motor side connector is limited to one direction depending on the terminal pin arrangement direction of the terminal, in addition to the lack of freedom of wiring, the lead wire is connected to the stator housing fixing member (bolt or the like). ), Which makes it difficult to arrange the motor side connector.

On the other hand, the terminal described in Patent Document 2 has terminal pins arranged in a row, and the occupation of the radial width can be configured to be relatively small, but the wiring direction of the motor-side connector is limited to one direction. It has not yet been resolved. Further, since the terminals are formed in a row, the shape of the motor side connector becomes longer in the terminal pin arrangement direction, and there is a problem that the motor side connector interferes with surrounding members and the arrangement is difficult.

Further, in the conventional wiring method, there is a problem that the projection area of the motor side connector is large, the motor side connector and the rib of the housing interfere with each other, and the arrangement of parts around these connection members becomes difficult.

Accordingly, the present invention has been made in view of the above problems, and in an electric compressor driven by an electric motor, the motor side connector and the terminal are connected without interfering with each other while increasing the degree of freedom of wiring. An object of the present invention is to provide an electric compressor capable of securing an arrangement space around these connecting members.

In order to achieve the above object, an electric compressor according to the present invention includes, in a housing, a compression mechanism, an electric motor that drives the compression mechanism, and an inverter that drives and controls the electric motor, and houses the electric motor. A motor side connector in which a motor housing part and an inverter housing part for housing the inverter are separated via a partition wall, a terminal is fixed to a through hole formed in the partition wall, and the terminal is connected to the motor via a cable And an inverter side connector connected to the inverter via a cable to electrically connect the inverter to the electric motor via the terminal, wherein the terminal includes the electric motor A motor having a terminal connector and three terminal pins connected to the inverter connector; At least one connector and the inverter-side connector is characterized in that is constituted by independent three connection terminals formed by.

Since at least one of the motor-side connector and the inverter-side connector is composed of three connection terminals formed independently of each other, it becomes unnecessary to form a motor-side connector corresponding to the shape of the terminal. The projected area can be reduced while increasing the degree of freedom of wiring of the side connector.

The terminal pins of the terminal may be arranged in a line, and at least one of the terminal pins may have a different length from other terminal pins.

By making the length of at least one terminal pin different from that of the other terminal pins, it becomes possible to arrange each motor side connector at a different position in the axial direction of the electric compressor. Even if the directions are different, the connection terminals can be mounted without interfering with each other.

The terminal pins arranged at the center of the terminal may be different in length from the terminal pins arranged at both ends.
The terminal pin located at the center is connected to the motor-side connector connected to the terminal pin located at the center and the terminal pin located at both ends by making the length different from the terminal pin located at both ends. It is possible to prevent the motor side connector from interfering with each other.

As described above, according to the present invention, when at least one of the motor-side connector and the inverter-side connector, for example, the motor-side connector is composed of a plurality of terminals formed independently, the motor-side connector corresponding to the shape of the terminal is provided. Since it becomes unnecessary to form, it becomes possible to secure the arrangement space around the connection member by increasing the degree of freedom of wiring of the motor-side connector and reducing the projection area.
Similarly, even when the inverter-side connector is configured by a plurality of terminals formed independently, the projected area is reduced while increasing the degree of freedom of wiring of the inverter-side connector, and the arrangement space around the connection member is reduced. It can be secured.

In addition, it is possible to prevent the connection terminals of the motor side connector from interfering with each other by making the length of at least one terminal pin different from that of other terminal pins. Therefore, it is possible to reduce the projected area and secure an installation space around the connection member.

FIG. 1A is a side sectional view showing the overall configuration of the electric compressor according to the present invention. FIG.1 (b) is an expanded sectional view which shows the attachment state of a terminal. FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a conceptual diagram showing an electric compressor according to the present invention, and a diagram showing terminals and connectors used in the compressor. FIG. 4 is an enlarged perspective view of the terminal. FIG. 5 is an enlarged perspective view showing a state in which the motor-side connector is connected to the terminal.

Hereinafter, an electric compressor according to the present invention will be described with reference to the drawings.
1 and 2, this electric compressor 1 is provided with a compression mechanism 4 on the right side in the figure in a housing 2 made of an aluminum alloy, and an electric motor 3 that drives the compression mechanism 4 on the left side in the figure. Is arranged. In FIG. 1, the left side in the drawing is the front of the electric compressor, and the right side in the drawing is the rear of the electric compressor.

In this example, the housing 2 includes a first housing member 5 on the front side and a second housing member 6 on the rear side, and these two

housing members

5 and 6 are axially connected by bolts (not shown). It is concluded to.

The first housing member 5 has a cylindrical shape in which a partition wall 5a is formed in the middle, and an inverter housing cylindrical portion (inverter housing portion) 5b whose front end is opened on the front side of the partition wall 5a. Further, a motor housing cylindrical portion (motor housing portion) 5c having a rear end opened on the rear side of the partition wall 5a is formed.

In the partition wall 5a, a terminal mounting hole 9 for attaching a terminal 7 made of a hermetic terminal is formed. Further, a suction port 15 (shown in FIG. 2) for introducing a refrigerant for compression by the compression mechanism 4 is formed in the motor housing cylindrical portion 5c.

Further, an inverter accommodating space 19 is defined by the partition wall 5a of the first housing member 5, the inverter accommodating cylindrical portion, and the lid 18 that closes the opening end of the inverter accommodating cylindrical portion, and this inverter accommodating space. 19, an inverter 30 (shown conceptually in FIG. 3) is accommodated.

As shown in FIG. 3, the inverter 30 accommodated in the inverter accommodating space 19 is electrically connected to the electric motor 3 via the terminal 7.
Specifically, the inverter 30 is connected to the terminal 7 by an inverter side connector (not shown) via a cable. Further, in the electric motor 3, the electric motor side connector 8 is connected to the terminal 7 through a lead wire 11 (cable).

The motor-side connector 8 is connected to the exciting coil 21c of the first stator 21, and the exciting coil 21c is connected to the exciting coil 22c of the second stator 22, so that the electric connection of the motor 3 is performed. It has been broken.
Therefore, the exciting coil 21c of the first stator 21 and the exciting coil 22c of the second stator 22 are connected in series to the inverter 30 and are supplied with the current having the same phase.

The first stator 21 is fixed to a plurality of pillars 5f formed on the first housing member 5 by bolts 21d.
As shown in FIG. 2, the pillar 5f is formed by protruding from the partition wall 5a toward the motor housing 5c. Each of the pillars 5f is disposed at substantially equal intervals (circumferential shape) from the center of the first housing member 5, and a bolt hole that is screwed into the bolt 21d is formed inside.
The bolt 21 d is provided so as to penetrate through the back yoke 21 a of the first stator 21.
Since the second stator 22 is also fixed to a plurality of pillars formed on the second housing member 6 by bolts (not shown) in the same manner as the first stator 21, the description thereof is omitted.

As shown in FIG. 4, the terminal 7 includes a main body portion 71 formed of a hard member, and three

terminal pins

72 a, 72 b, 72 c that are fixed to the main body portion 71. Yes. The main body 71 has an elliptical cylindrical insertion part 74 in which the

terminal pins

72a, 72b, 72c are hermetically penetrated and fixed to the terminal mounting hole 9, and is extended integrally from the insertion part 74 radially outward. The mounting hole 9 has a diameter larger than that of the mounting hole 9 and a diameter smaller than that of the large-diameter wall portion 5d, and has a flange portion 75 that can be locked to the step portion 5e.

Also, as shown in FIG. 1B, the side surface of the insertion portion 74 is provided with two C-ring mounting grooves 74a for mounting the C-ring along the end wall surface.
The C-ring mounting groove 74 a is formed in a portion protruding into the inverter accommodating space 19 when the terminal 7 is mounted in the terminal mounting hole 9. Therefore, the terminal 7 is prevented from coming out of the terminal mounting hole 9 by mounting the C-ring 74b in the two C-ring mounting grooves 74a.

Furthermore, an O-ring mounting groove 74c for mounting an O-ring is provided on the side surface of the insertion portion 74 over the entire circumference. The O-ring mounting groove 74 c is formed in a portion that fits in the terminal mounting hole 9 when the terminal 7 is mounted in the terminal mounting hole 9. Therefore, by mounting the O-ring 74d in the O-ring mounting groove 74c, airtightness with the inverter accommodating space 19 is maintained.

The three

terminal pins

72a, 72b, and 72c are formed in rows arranged in the same direction.
Further, the terminal pin 72b disposed in the center is a terminal pin in which a portion (a portion formed below the flange portion 75 in FIG. 4) disposed in the motor housing cylindrical portion 5c is disposed at both ends. 72a and 72c are different in length.

That is, the terminal pin 72b disposed at the center is formed longer than the

terminal pins

72a and 72c disposed at both ends, and the terminal pins 72a and 72c disposed at both ends are formed to have the same length. Has been.

On the other hand, the portions (portions formed above the flange portion 75 in FIG. 4) arranged in the inverter accommodating cylindrical portion 5b that is electrically connected to the inverter 30 are the respective

terminal pins

72a and 72b. , 72c are approximately the same length.

As shown in FIGS. 2 and 5, the motor-side connector 8 includes three

connection terminals

81 a, 81 b, 81 c that are independently formed.
Specifically,

connection terminals

81a, 81b, 81c are provided at the tips of the three lead wires 11, respectively, and each can be independently connected to the

terminal pins

72a, 72b, 72c of the terminal 7.

The

connection terminals

81a, 81b, 81c are known per se, and are formed in, for example, a rectangular parallelepiped shape. A lead wire connection portion 83 for connecting to the lead wire 11 is formed on the base end face 82, and a terminal is provided on the side face 84. Terminal pin connection portions 85 that are connected to the

pins

72a, 72b, and 72c are formed, and the lead wire connection portion 83 and the terminal pin connection portion 85 are electrically connected inside the

connection terminals

81a, 81b, and 81c.

The second housing member 6 has a cylindrical shape in which a partition wall 6a is formed in the middle. A motor housing cylindrical portion 6b having a front end opened on the front side of the partition wall 6a is formed. A compression mechanism accommodating cylindrical portion 6c having a rear end opened on the rear side of the partition wall 6a is formed. The partition wall 6a is integrally formed with a thrust surface 6e for defining an axial position of a back yoke 22a of a second stator 22 (to be described later) and a boss 6d that penetrates and supports the shaft 10, and a compression mechanism housing cylinder. A discharge port (not shown) for discharging the refrigerant compressed by the compression mechanism 4 is formed in the shape portion 6c.

The electric motor 3 is an axial gap type motor, and when the first housing member 5 and the second housing member 6 are assembled, the partition wall 5a of the first housing member 5 and the motor housing cylindrical portion 5c. The compression mechanism 4 is housed in a motor housing space 17 surrounded by the partition wall 6a of the second housing member 6 and the motor housing tubular portion 6b, and the compression mechanism 4 is a compression mechanism of the second housing member 6. It is accommodated in the accommodating cylindrical part 6c. The motor housing space 17 communicates with the suction port 15 formed in the motor housing cylindrical portion 5 c of the first housing member 5, and constitutes a low pressure path that guides the refrigerant to the compression mechanism 4.

The axial gap type motor 3 includes a disk-shaped rotor 20 fixed to the shaft 10, a first stator 21 that is opposed to the front side of the rotor 20 in the axial direction via an air gap, and the rotor 20. The second stator 22 is disposed opposite to the rear side through an air gap in the axial direction.

The rotor 20 has a plurality of fan-shaped permanent magnets 23 arranged along its circumference, and a through hole 20a through which the shaft 10 is inserted is formed at the center.

The compression mechanism 4 is, for example, a vane type, and includes a compressor rotor 41 fixed by press-fitting into a predetermined position of the shaft 10 that penetrates the partition wall 6a and protrudes into the compression mechanism accommodating cylindrical portion 6c. A cylinder member 42 that fits in the axial direction of the shaft 10 into the compression mechanism accommodation cylindrical portion 6c of the second housing member 6 and accommodates the compressor rotor 41 together with the housing member 6; And a vane (not shown) that slidably contacts the inner peripheral surface of the cylinder member 42 to define the compression chamber 40.

The cylinder member 42 is formed with a rotor accommodating portion 43 that accommodates the compressor rotor 41 on the front side that is the distal end side of insertion into the compression mechanism accommodating cylindrical portion 6c, and the bolt 44 is pivoted from the motor accommodating space side (front side). It is fixed to the second housing member 6 in the axial direction by screwing in the direction through the partition wall 6a. The shaft 10 is inserted into a bearing hole 45 formed at the center of the cylinder member 42 at the rear side end protruding from the compressor rotor 41, and is rotatably supported by the bearing hole 45 via a plain bearing 46. At the same time, it is pivotally supported via a plain bearing 47 at a portion passing through the boss portion 6d.

Accordingly, the compressor rotor 41 has an axial position relative to the housing 2 defined by the partition wall 5 a of the first housing member 5 and the cylinder member 42, so that an axial position of the shaft 10 relative to the housing 2 is defined. In the state where the compression mechanism 4 is assembled, the axial position of the rotor 20 fixed to the shaft 10 with respect to the housing 2 is defined.

In such an electric compressor, the refrigerant flowing into the motor housing space 17 via the suction port 15 compresses the compression mechanism 4 through a passage (not shown) formed in the partition wall 6a while cooling the motor 3. The refrigerant guided to the chamber 40 and sucked by the rotation of the compressor rotor 41 is compressed and discharged from the discharge port via a discharge path (not shown).

As described above, according to the present invention, the motor-side connector 8 includes the plurality of

connection terminals

81a, 81b, and 81c formed independently of each other, thereby forming the motor-side connector 8 according to the shape of the terminal 7. Therefore, it is possible to secure the arrangement space around the connection member by reducing the projection area while increasing the degree of freedom of wiring of the motor-side connector 8.

Further, the terminal pins 72b arranged at the center are different in length from the terminal pins 7272a, 72c arranged at both ends, so that the

connection terminals

81a, 81b, 81c of the motor side connector 8 interfere with each other. Therefore, it is possible to reduce the projection area required for the installation of the motor-side connector 8 and to secure an installation space around the

connection members

7 and 8.

Further, even when an object that obstructs connection, such as the pillar 5f, is provided in the motor housing space 17 as in this embodiment, the connection terminal of the motor side connector 8 does not interfere with such an obstacle. 81a, 81b, 81c can be connected to the respective

terminal pins

72a, 72b, 72c.
That is, since each

connection terminal

81a, 81b, 81c is formed independently, the connection direction of each

connection terminal

81a, 81b, 81c is adjusted to an appropriate position to connect without interfering with an obstacle. be able to.

In the embodiment, the terminal pin 72b is formed longer than the other

terminal pins

72a and 72c. However, the present invention is not limited to this, and the terminal pin 72b is formed shorter than the other

terminal pins

72a and 72c. The terminal pins 72a, 72b, 72c may be formed in different lengths.

In addition, the portion of the terminal 7 that is disposed in the inverter housing cylindrical portion 5b that is electrically connected to the inverter 30 is formed so that the lengths of the

terminal pins

72a, 72b, and 72c are approximately the same. However, the three

terminal pins

72a, 72b, 72c may be formed to have different lengths as in the portion arranged in the motor housing cylindrical portion 5c that is electrically connected to the electric motor 3. Good.

Further, the inverter-side connector may be constituted by three connection terminals formed independently of each other similarly to the motor-side connector 8. In such a case, it is possible to secure the arrangement space around the connection member by reducing the projected area while increasing the degree of freedom of wiring of the inverter-side connector.

DESCRIPTION OF SYMBOLS 1 Electric compressor 2 Housing 3 Electric motor 4 Compression mechanism 30 Inverter 5a Partition wall 5b Inverter accommodation cylindrical part (inverter accommodation part)
5c Motor housing cylindrical part (motor housing part)
7 Terminal 72a, 72b, 72c Terminal pin 8

Motor side connector

81a, 81b, 81c Connection terminal 9 Terminal mounting hole (through hole)

Claims

The housing includes a compression mechanism, an electric motor that drives the compression mechanism, and an inverter that drives and controls the electric motor.
An electric motor housing portion for housing the electric motor and an inverter housing portion for housing the inverter are separated via a partition wall, and a terminal is fixed to a through hole formed in the partition wall,
The inverter is electrically connected to the motor via the terminal by connecting the motor side connector connected to the motor via a cable and the inverter side connector connected via a cable to the inverter. In the electric compressor to be connected,
The terminal has three terminal pins connected to the motor side connector and the inverter side connector,
At least one of the motor-side connector and the inverter-side connector is constituted by three connection terminals formed independently from each other.
Each terminal pin of the terminal is arranged in a row,
The electric compressor according to claim 1, wherein at least one of the terminal pins is different in length from other terminal pins.
3. The electric compressor according to claim 2, wherein the terminal pin arranged at the center of the terminal is different in length from the terminal pins arranged at both ends.