WO2010001834A1

WO2010001834A1 - Electric compressor

Info

Publication number: WO2010001834A1
Application number: PCT/JP2009/061749
Authority: WO
Inventors: 正則田口; 一三大里; 英司小林; 正栗原
Original assignee: サンデン株式会社
Priority date: 2008-07-02
Filing date: 2009-06-26
Publication date: 2010-01-07
Also published as: EP2309129A1; US20110142695A1; JP2010013979A

Abstract

An electric compressor wherein a lead wire on the motor drive circuit side can be reliably electrically connected to a sealed terminal. A sealed terminal is constructed from a terminal body consisting of electrically conductive metal and having at an end thereof a male thread section, and from a joint nut consisting of electrically conductive metal of a material different from the material of the terminal body and provided so as to be engageable with the male thread section of the terminal body. The construction enables the joint nut of the different material from the terminal body to be firmly joined to the terminal body and a lead wire of the same material as the joint nut to be firmly joined by welding to the joint nut. As a result, the lead wire on the drive circuit containing chamber side can be reliably electrically connected to the sealed terminal.

Description

Electric compressor

The present invention relates to an electric compressor including a motor for driving a compression unit, a motor drive circuit for driving the motor, and a sealing terminal for electrically connecting the motor and the motor drive circuit. .

Conventionally, this type of electric compressor includes a compressor for compressing a refrigerant, a motor for driving the compressor, a motor drive circuit for driving the motor, and a motor and a motor drive circuit. And a sealing terminal for electrically connecting the lead wire on the motor side and the lead wire on the motor drive circuit side is known (see, for example, Patent Document 1). .

Japanese Patent Laid-Open No. 11-324920

In conventional electric compressors, when connecting the lead wire on the motor drive circuit side to the sealed terminal, the lead wire is welded to the sealed terminal or connected by a connector. However, since the sealed terminal is made of iron-based metal and the lead wire on the motor drive circuit side is made of copper-based metal, when welding the lead wire on the motor drive circuit side to the sealed terminal, each melting point However, welding is difficult. In addition, when the lead wire on the motor drive circuit side is connected to the sealed terminal by a connector, it is only connected by the elastic force of the metal material of the connector, and the contact area between the sealed terminal and the lead wire is small and large. Not suitable for energizing current.

An object of the present invention is to provide an electric compressor capable of reliably connecting a lead wire on the motor drive circuit side to a sealed terminal.

In order to achieve the above object, the present invention provides a compression section for compressing a refrigerant, a motor for driving the compression section, a motor drive circuit for driving the motor, and a motor and a motor drive circuit. A sealing terminal for electrically connecting the lead wire on the motor side and the lead wire on the motor drive circuit side, the sealing terminal is made of a conductive metal and has an end portion. The terminal main body is provided with a male screw portion and a joining member made of a metal having conductivity different from that of the terminal main body and provided so as to be able to be screwed to the male screw portion of the terminal main body.

Thereby, since the joining member is screwed into the male screw portion of the terminal body, it is possible to reliably join the joining members of different materials to the terminal body.

According to the present invention, it is possible to reliably bond a joining member made of a different material to the terminal body, and to reliably join the lead wire made of the same material as the joining member to the joining member by welding. On the other hand, the lead wire on the motor drive circuit side can be reliably electrically connected.

Side surface sectional drawing of the electric compressor which shows one Embodiment of this invention Cross section of sealed terminal Disassembled perspective view of sealed terminal Cross section of sealed terminal showing another example

1 to 3 show an embodiment of the present invention.

The electric compressor of the present invention includes a housing 10 formed in a cylindrical shape, a compression unit 20 for compressing a refrigerant, a motor 30 for driving the compression unit 20, and operation control for the motor 30. This is a scroll type electric compressor provided with a drive circuit unit 40 as a motor drive circuit. For example, HFC-134a, carbon dioxide, or the like is used as a refrigerant.

The housing 10 includes a first housing 11 in which the compression unit 20 is accommodated, a second housing 12 in which the motor 30 is accommodated, and a third housing 13 in which the drive circuit unit 40 is accommodated.

The first housing 11 has one end face closed and the other end face joined to one end face of the second housing 12. A refrigerant discharge port (not shown) is provided on the peripheral surface on the one end surface side of the first housing 11.

The second housing 12 has one end surface coupled to the first housing 11 and the other end surface coupled to one end surface of the third housing 13.

The first housing 11 and the second housing 12 are coupled by a bolt 14 via a center plate, which will be described later, for rotatably supporting one end side of a driving shaft, which will be described later, for driving the compression unit 20.

The third housing 13 is coupled to the second housing 12 at one end surface side and is closed by a closing plate 15 so that the other end surface side can be opened. In addition, a refrigerant suction port is provided on the peripheral surface on the one end surface side of the third housing 13. Further, the third housing 13 is partitioned by a partition wall 13a into one end surface side including the refrigerant inlet and the other end surface side, and a drive circuit storage chamber 13b for storing the drive circuit section 40 and the motor 30. A refrigerant suction chamber 13c communicating with the side is provided.

The compression unit 20 is a fixed scroll member 21 fixed to one end side of the first housing 11 and a orbiting scroll member provided on the other end side of the first housing 11 so as to be turnable with respect to the fixed scroll member 21. 22.

The fixed scroll member 21 is a disk-like member provided so as to partition the inside of the first housing 11, and a spiral body 21a is provided on the surface on the orbiting scroll member 22 side. In addition, a refrigerant discharge hole 21 b for discharging the refrigerant compressed in the compression unit 20 is provided in the central portion in the radial direction of the fixed scroll member 21. A refrigerant discharge chamber 11a is formed between one end surface in the first housing 11 and the fixed scroll member 21, and refrigerant discharged from the refrigerant discharge port flows into the refrigerant discharge chamber 11a.

In the orbiting scroll member 22, a spiral body 22 a is provided on the surface on the fixed scroll member 21 side, and one end side of a drive shaft 23 for transmitting the rotational force of the motor 30 is connected to the opposite surface via a drive bush 24. Has been.

The drive shaft 23 is provided so as to extend along the central axis of the second housing 12. The drive shaft 23 is provided such that the connecting portion 23 a with the drive bush 24 is eccentric from the rotation center of the drive shaft 23. The drive shaft 23 is rotatably supported at one end side by a center plate 25 provided between the compression unit 20 and the motor 30 via a ball bearing 26, and the other end side is provided on the other end surface side of the second housing 12. The bearing 12a is rotatably supported via a ball bearing 27. That is, the drive shaft 23 is rotated by the motor 30 so as to turn the orbiting scroll member 22 on a predetermined circular orbit.

The center plate 25 is provided so as to partition the space on the compression unit 20 side in the housing 10 and the space on the motor 30 side, and a communication hole is provided for communicating the space on the compression unit 20 side and the space on the motor 30 side. ing. Further, the center plate 25 is provided with a flange portion 25 a over the circumferential direction of the outer peripheral surface, and the flange portion 25 a is sandwiched between the first housing 11 and the second housing 12.

Between the orbiting scroll member 22 and the center plate 25, in order to regulate the orbiting position of the orbiting scroll member 22, a pin fixed to each of the orbiting scroll member 22 and the center plate 25 and a connection for connecting the pins together. A turning position restricting mechanism 28 composed of members is provided.

The motor 30 includes a three-phase induction motor and the like, and includes a rotor 31 formed of a permanent magnet fixed to the drive shaft 23 and a stator 32 provided so as to surround the rotor 31 and fixed in the second housing 12. is doing.

The drive circuit unit 40 includes an inverter circuit 41 having a power semiconductor element 41a as a plurality of heat generating components on a substrate, a power circuit component 42 such as a smoothing capacitor and a noise filter, a control unit 43 having a microcomputer configuration, and the like. It is stored in the circuit storage chamber 13b and is fixed in the drive circuit storage chamber 13b by a mold resin 44.

The electric compressor is provided on a partition wall 13a positioned below the refrigerant suction chamber 13c, and includes three sealed terminals 50 for supplying electric power from the inverter circuit 41 to the windings of the stator 32. Yes.

Each sealed terminal 50 includes a terminal main body 51 inserted into a through hole 13d provided in the partition wall 13a, a fixing nut 52 for fixing the terminal main body 51 to the partition wall 13a, and the second housing 12 of the partition wall 13a. The first insulating member 53 interposed on the side, the second insulating member 54 interposed between the fixing nut 52 and the partition wall 13a, and the end of the terminal body 51 on the drive circuit storage chamber 13b side can be coupled. And a connecting nut 55 as a connecting member to which the lead wire 45 on the drive circuit storage chamber 13b side is joined by welding, and an insulating cover 56 for covering the terminal body 51 from the second housing 12 side. Yes. Here, the lead wire 45 on the drive circuit storage chamber 13b side is formed of a copper-based material.

The terminal body 51 is made of an iron-based metal, and a flange 51a is provided at an end portion on the second housing 12 side, and a male screw portion 51b is provided at an end portion on the drive circuit storage chamber 13b side. The lead wire 33 on the motor 30 side is connected to the end of the motor. In the terminal main body 51, the first insulating member 53 is interposed on the second housing 12 side of the partition wall 13a, and the second insulating member 54 is interposed on the drive circuit storage chamber 13b side of the partition wall 13a. The fixing nut 52 is attached to the partition wall 13a by screwing the fixing nut 52 into the male screw portion 51b.

The first insulating member 53 and the second insulating member 54 are each made of an insulating member such as ceramic or resin. The first insulating member 53 is provided with three holes 53 a through which the three terminal bodies 51 are inserted, and one first insulating member 53 is interposed between the three terminal bodies 51. The second insulating member 54 is provided with a hole 54 a through which the terminal main body 51 is inserted, and one second insulating member 54 is interposed with respect to one terminal main body 51.

The joining nut 55 is made of a copper-based metal and is formed in a cap nut shape with one end side closed. The joining nut 55 is provided with a welded portion 55a so as to protrude from one end side, and the lead wire 45 on the drive circuit storage chamber 13b side is joined to the welded portion 55a by welding. The joining nut 55 is provided with a length that fits with the male screw part 51b of the terminal body 51 at least 0.4 times the diameter of the male screw part 51b.

The insulating cover 56 is made of an elastic and insulating material such as rubber. The insulating cover 56 is formed so as to cover the entire end surface of the first insulating member 53, and covers the end portions of the three terminal bodies 51. In addition, the insulating cover 56 is provided with three holes 56a through which the three lead wires 33 on the motor 30 side are respectively inserted.

In the electric compressor configured as described above, when the motor 30 is energized and the drive shaft 23 is rotated, the orbiting scroll member 22 orbits relative to the fixed scroll member 21 in the compression unit 20. As a result, the refrigerant flowing into the housing 20 from the refrigerant suction port cools the power semiconductor elements 41a of the inverter circuit 41 of the drive circuit unit 40 via the partition wall 13a of the refrigerant suction chamber 13c, and the inside of the second housing 12 And the motor 30 is cooled. The refrigerant flowing through the second housing 12 flows between the orbiting scroll member 22 and the center plate 25 through the communication hole of the center plate 25, cools the orbiting position regulating mechanism 50, and then flows into the compression unit 20. To do. The refrigerant compressed in the compression unit 20 flows into the refrigerant discharge chamber 11a from the refrigerant discharge hole 21b and is discharged from the refrigerant discharge port.

Further, when performing the work of connecting the lead wire 45 on the drive circuit storage chamber 13b side in each sealed terminal 50, the joining nut 55 is screwed onto the male screw portion 51b with the terminal body 51 attached to the partition wall 13a. The lead wire 45 is joined to the welded portion 55a of the joining nut 55 by welding.

As described above, according to the electric compressor of the present embodiment, the sealing terminal 50 is made of a conductive metal, the terminal main body 51 having the male screw portion 51b at the end, the terminal main body 51, the terminal The joint nut 55 is made of a metal having conductivity different from that of the main body 51 and is provided so as to be able to be screwed into the male screw portion 51 b of the terminal main body 51. 55, the lead wire 45 made of the same material as the joining nut 55 can be reliably joined to the joining nut 55 by welding, and the lead wire 45 on the drive circuit housing chamber 13b side with respect to the sealing terminal 50. Can be reliably electrically connected.

In addition, since the terminal body 51 is made of iron-based metal and the joining nut 55 is made of copper-based metal, the lead wire 45 made of copper-based metal can be easily welded to the joining nut 55, It is possible to reliably connect the lead wire 45 made of a copper-based metal to the terminal body 51 made of an iron-based metal.

In addition, since the length that the joint nut 55 is fitted to the male screw portion 51 b of the terminal body 51 is 0.4 times or more the diameter of the male screw portion 51 b, the joint nut 55 is attached to the terminal body 51. It is possible to securely attach, secure a predetermined contact area between the terminal body 51 and the joining nut 55, and improve the strength of the sealed terminal 50 and reduce the energization resistance.

In the above-described embodiment, the joining nut 55 is provided so as to protrude from one end side, and the welding portion 55a is provided to join the lead wire 45 on the drive circuit storage chamber 13b side by welding. As shown in FIG. 4, the lead wire 45 may be directly joined to one end side of the joining nut 55 by welding without providing the welding portion 55 a on the joining nut 55.

13a ... partition wall, 20 ... compression part, 30 ... motor, 33 ... lead wire, 40 ... drive circuit part, 45 ... lead wire, 50 ... sealed terminal, 51 ... terminal body, 51b ... male screw part, 55 ... joint nut .

Claims

A compression section (20) for compressing the refrigerant;
A motor (30) for driving the compression section (20);
A motor drive circuit (40) for driving the motor (30);
The lead wire (33) on the motor (30) side and the lead wire (45) on the motor drive circuit (40) side are provided on a partition wall (13a) that partitions the motor (30) and the motor drive circuit (40). And a sealing terminal (50) for electrically connecting
The sealed terminal (50) is made of a conductive metal, and is composed of a terminal body (51) provided with a male screw part (51b) at the end, and a conductive metal of a material different from that of the terminal body (51). And a joining member (55) provided so as to be able to be screwed to the male screw part (51b) of the terminal body (51).
The terminal body (51) is an iron-based metal,
The electric compressor according to claim 1, wherein the joining member (55) is a copper-based metal.
The length in which the joining member (55) is fitted to the male screw portion (51b) of the terminal body (51) is 0.4 times or more the diameter of the male screw portion (51b). The electric compressor as described.