JP2003056476A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor reducible in the number of part items by simplifying seal constitution. SOLUTION: A housing 11 is constituted by jointing a first housing constitutive body 21 and a second housing constitutive body 22, and a scroll type compression mechanism 14 is accommodated in the housing 11. A discharge chamber 52 is partitioned in the housing 11 by jointing the compression mechanism 14 and the second housing constitutive body 22. A common gasket 31 is used for sealing a joint part between the first housing constitutive body 21 and the second housing constitutive body 22 and for sealing a joint part between the compression mechanism 14 and the second housing constitutive body 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor that constitutes a refrigeration cycle of a vehicle air conditioner and compresses a refrigerant gas.

[0002]

2. Description of the Related Art As a compressor of this type, there is, for example, one disclosed in Japanese Patent Laid-Open No. 7-174084. In the compressor, a compression mechanism is housed in a housing formed by joining and fixing a plurality of housing constituents. A discharge chamber from which the compressed gas from the compression mechanism is discharged is defined by joining the inner surface of the housing and the compression mechanism in the housing.

[0003]

However, in the technique of the above publication, the sealing of the joint between the housing constituents and the sealing of the joint between the inner surface of the housing and the compression mechanism are performed by different sealing members. ing. Therefore,
There has been a problem that the number of parts constituting the compressor increases.

An object of the present invention is to provide a compressor capable of simplifying the seal structure and reducing the number of parts.

[0005]

In order to achieve the above-mentioned object, the invention of claim 1 is such that a compression mechanism is housed in a housing formed by joining and fixing a plurality of housing constituents. In a compressor configured to perform gas compression by being operated, the housing has a cylindrical first housing structure in which a compression mechanism is arranged, and a cylinder joined to the first housing structure. A second housing structure that closes the circular opening and that is joined to the compression mechanism to partition and form a discharge chamber with the compression mechanism, and a joint portion between the first housing structure and the second housing structure. A seal member is interposed in the seal member, and an inner peripheral portion of the seal member extends inward of the housing from a joint portion between the two housing components, and the extended portion serves as a compression mechanism and a second housing component. of Compressor, characterized by being interposed if portions.

In this structure, a common seal member is used for sealing the joint portion between the first housing constituent member and the second housing constituent member and sealing the joint portion between the compression mechanism and the second housing constituent member. There is. Therefore, the seal structure of the compressor can be simplified and the number of parts can be reduced.

According to a second aspect of the present invention, in the first housing structure according to the first aspect, the joint surface with the first housing member and the joint surface with the compression mechanism are substantially flush with each other. There is.

In this structure, it is easy to employ a flat plate-shaped seal member, and the common seal member described in the invention of claim 1 can be easily realized at low cost.

According to a third aspect of the present invention, in the first or second aspect, the joint surface of the first housing component with the second housing component and the joint face of the compression mechanism with the second housing component are substantially flush with each other. It is characterized by being present above.

In this structure, it is easy to adopt a flat plate-shaped seal member, and the common seal member described in the invention of claim 1 can be easily realized at low cost.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the first housing component is compressed in the housing so as to face a joint surface of the second housing component with the compression mechanism. A mechanism clamping surface is formed, and the compression mechanism is brought into contact with the compression mechanism clamping surface of the first housing component by joining and fixing the first housing component and the second housing component. It is characterized in that it is sandwiched and fixed between both housing components.

With this structure, a fixing tool such as a bolt is not required to fix the compression mechanism to the housing, and the structure of the compressor can be simplified. In addition, the compression mechanism can be fixed to the housing at the same time when the first housing structure and the second housing structure are joined and fixed, and the compressor assembling process can be simplified.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a preferred aspect of the compressor is limited. That is, the compression mechanism is driven by an electric motor, and the electric motor is housed in the housing together with the compression mechanism.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the compression mechanism is a scroll type.
The fixed scroll member that constitutes the compression mechanism is joined to the second housing structure, so that the discharge chamber is partitioned and formed in the housing so as to be surrounded by both.

This structure has advantages of small size, high efficiency and low noise, as compared with, for example, a piston type compression mechanism.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is embodied in an electric compressor used in a vehicle air conditioner will be described below.

(Housing of Electric Compressor) As shown in FIG. 1, the housing 11 of the electric compressor is formed by joining and fixing two housing constituents, a first housing constituent 21 and a second housing constituent 22. It is configured. First
The housing structure 21 has a bottomed cylindrical shape having a bottom 24 on the left side of the cylindrical portion 23 in the drawing, and is manufactured by die casting of an aluminum alloy. The second housing structure 22 has a cylindrical shape with a lid having a lid 26 on the right side of the cylindrical portion 25 in the drawing, and is manufactured by die casting of an aluminum alloy. Housing component 2 made of aluminum-based metal material such as aluminum alloy
Comprising 1 and 22 is advantageous in reducing the weight of the electric compressor, as compared with the case of using an iron-based metal material, for example.

The cylindrical portion 2 of the first housing structure 21
3, the cylinder length is longer than its outer diameter. On the contrary, the cylindrical portion 25 of the second housing structure 22 has a shorter cylinder length than its outer diameter. Therefore, in the housing 11, the first housing structure 21 occupies most of the outer contour as a main housing structure.

A plurality of mounting feet 27 are integrally formed on the outer peripheral surface of the cylindrical portion 23 of the first housing structure 21. An insertion hole 27a is formed through the mounting foot 27. A bolt used for attaching the electric compressor to the vehicle body is inserted into the insertion hole 27a.

As shown in FIGS. 1 and 2, in the first housing structure 21, the inner peripheral surface 23a of the cylindrical portion 23 is formed.
Has a gradually increasing inner diameter from the bottom 24 side toward the opening side. On the inner peripheral surface 23a of the cylindrical portion 23, the wall surface of the step located at the boundary between the small diameter area on the bottom portion 24 side having the smallest diameter and the intermediate diameter area adjacent thereto forms the motor positioning surface 23b. On the inner peripheral surface 23a of the cylindrical portion 23, the wall surface of the step located at the boundary between the largest diameter area on the opening side having the largest diameter and the intermediate diameter area adjacent thereto forms the holding surface 23c for the compression mechanism. There is. In addition,
The inner peripheral surface of the cylindrical portion 23 whose inner diameter is changed stepwise is
The first housing structure 21 is formed by grinding or the like after the post-processing.

Cylindrical portion 2 of the first housing structure 21
In FIG. 3, a plurality of mounting portions 28 are bulged on the outer peripheral surface on the open end side. In each mounting portion 28, the end surface 28a on the second housing structure 22 side exists on the same plane as the opening end surface 23d of the cylindrical portion 23, and both end surfaces 23d, 28a.
The joint surface on the side of the first housing structure 21 is constituted by. A screw hole 28b is formed in the end surface 28a of each mounting portion 28.
Has been drilled.

The cylindrical portion 2 of the second housing structure 22.
In FIG. 5, a plurality of mounting portions 29 are formed so as to bulge on the outer peripheral surface on the opening end side. An end surface 29a of each mounting portion 29 on the side of the first housing structure 21 exists on the same plane as the opening end surface 25a of the cylindrical portion 25, and both end surfaces 25a, 29a.
The joint surface on the side of the second housing structure 22 is constituted by. The second housing structure 2 is attached to each mounting portion 29.
Insertion hole 29 from 2 toward the first housing structure 21
b is formed through.

The first housing component 21 and the second housing component 22 are joined to each other by joining surfaces 23d, 28a, 25a,
The bolts 30 which are joined to each other with the attachment holes 29a and which are inserted through the insertion holes 29b of the attachment portion 29 of the second housing component 22 are attached to the attachment portion 2 of the first housing component 21.
By being screwed into the eight screw holes 28b, they are fastened and fixed to each other.

Joining surfaces 23d, 28a, 25a, 2 of the first housing component 21 and the second housing component 22
A flat plate-shaped gasket 3 as a sealing member is provided between 9a.
1 is interposed. Therefore, in the housing 11,
First housing structure 21 and second housing structure 22
A closed space 12 is formed surrounded by and.

Joining surface 2 of the second housing structure 22
5a and 29a are joint surfaces 2 of the first housing structure 21.
It is wider toward the inner peripheral side (closed space 12 side) than 3d and 28a. Therefore, in the joined state of the first housing component 21 and the second housing component 22, the joint surfaces 25a and 29a of the second housing component 22 are different from the joint faces 23d and 28a of the first housing component 21. Is projected to the inner circumference side. The portions of the joint surfaces 25a and 29a that are protruded toward the inner peripheral side have the compression mechanism holding surface 23 of the first housing structure 21 in the closed space 12.
It is located so as to face c and serves as the compression mechanism holding surface 25b on the second housing structure 22 side.

As the gasket 31, a gasket having substantially the same shape as the joint surfaces 25a and 29a of the second housing component 22 is used. Therefore, the gasket 31 also protrudes toward the inner peripheral side with respect to the joint surfaces 23d and 28a of the first housing structure 21.

(Motor part of electric compressor) As shown in FIG. 1, in the first housing structure 21, a cylindrical shaft support part 24a is integrally projectingly provided at the center of the inner wall surface of the bottom part 24. There is. Inside the first housing structure 21, a shaft support member 32 having an insertion hole 32a formed at its center is disposed on the opening end side of the cylindrical portion 25. The coaxial support member 32 is fitted into the cylindrical portion 23 of the first housing structure 21, and the outer peripheral portion of the coaxial support member 32 has the compression mechanism holding surface 23.
It is pushed to the position where it abuts c.

A rotary shaft 33 is housed in the first housing structure 21. The left end side of the rotary shaft 33 is rotatably supported by the shaft support portion 24a via a radial bearing 34. The right end side of the rotary shaft 33 is inserted through the insertion hole 32a of the shaft support member 32, and is rotatably supported by the shaft support member 32 through the radial bearing 35 in the insertion hole 32a.
That is, in the closed space 12, the rotary shaft 33 is rotatably supported by the same housing structure (first housing structure 21) at both ends.

Bottom 2 in the first housing assembly 21
The stator 36 is arranged on the fourth side. The stator 36 includes a cylindrical iron core 36a and a winding wire 36b wound around the iron core 36a. Same stator 36
Is press-fitted into the cylindrical portion 23 of the first housing structure 21 with the iron core 36a, and the outer peripheral portion of the iron core 36a is pushed to a position where it abuts on the motor positioning surface 23b. A magnet 37 is fixedly arranged on the rotary shaft 33 in the first housing structure 21 so as to be located on the inner peripheral side of the stator 36.

The stator 36 and the magnet 37 constitute a motor unit 13 which is a brushless DC motor. The motor unit 13 integrally rotates the magnet 37 and the rotating shaft 33 by controlling power supply from outside to the winding 36b of the stator 36.

(Compression Mechanism of Electric Compressor) As shown in FIGS. 1 and 2, a scroll type is used as the compression mechanism 14 of the electric compressor.

That is, the first housing component 21
A fixed scroll member 41 is disposed inside the cylindrical portion 23 on the open end side. The fixed scroll member 41
The cylindrical outer peripheral wall 41b is erected on the outer peripheral side of the disc-shaped substrate 41a, and the fixed spiral wall 41c is erected on the inner peripheral side of the outer peripheral wall 41b in the same substrate 41a.

The fixed scroll member 41 includes an outer peripheral wall 4
The left end surface of 1b is in contact with the compression mechanism holding surface 23c of the first housing structure 21 via the outer peripheral portion of the shaft support member 32. In the fixed scroll member 41, the right end surface 41f of the outer peripheral wall 41b is in contact with the compression mechanism holding surface 25b of the second housing structure 22 via the inner peripheral portion of the gasket 31. The same right end surface (joint surface with the second housing constituent body 22) 41f exists on the same plane as the joint surfaces 23d and 28a of the first housing constituent body 21. Therefore, the fixed scroll member 41 holds the compression mechanism in the closed space 12 together with the shaft support member 32 forming a part of the compression mechanism 14 by fastening and fixing the first housing component 21 and the second housing component 22. Surface 23c, 25b
It is pinched and fixed between them.

On the outer peripheral surface of the outer peripheral wall 41b of the fixed scroll member 41, an annular recess 41d is formed, which is partially separated around the axis of the member 41.
Therefore, the outer peripheral wall 41b of the fixed scroll member 41 is the first
In a state of being joined to the inner peripheral surface on the open end side of the housing structure 21, the heat insulating space 42 is formed by being surrounded by the recess 41d and the inner peripheral surface 23a of the first housing structure 21.

The heat insulating space 42 is interposed at the joint portion between the first housing component 21 and the fixed scroll member 41, thereby slowing the heat conduction between the two. Particularly in the present embodiment, the heat insulating space 42 is provided for the purpose of slowing the heat conduction from the first housing structure 21 to the fixed scroll member 41.

An eccentric shaft 43 is provided on the end surface of the rotary shaft 33 on the fixed scroll member 41 side at a position eccentric to the axis of the rotary shaft 33. Same eccentric shaft 43
A bush 44 is externally fitted and fixed to this. Same bush 4
A movable scroll member 45 is rotatably supported by the bearing 4 via a bearing 46 so as to face the fixed scroll member 41. The movable scroll member 45 includes a disk-shaped substrate 45a and a movable scroll wall 45b provided upright toward the fixed scroll member 41.

The fixed scroll member 41 and the movable scroll member 45 are meshed with each other by means of spiral walls 41c and 45b, and at the same time, the spiral walls 41c and 45 are formed.
The front end surface of b is the base plate 4 of the other scroll member 41, 45.
It is joined to 1a and 45a. Therefore, the base plate 41a and the fixed spiral wall 41c of the fixed scroll member 41, the base plate 45a and the movable spiral wall 45b of the movable scroll member 45.
Defines the compression chamber 47.

Substrate 45a of the movable scroll member 45
Between the shaft supporting member 32 and the shaft supporting member 32 opposed thereto, there are formed an annular hole 48a provided in the coaxial supporting member 32 and a pin 48b projecting from the movable scroll member 45 and loosely fitted in the annular hole 48a. A known rotation prevention mechanism 48 is provided.

Outer peripheral wall 41 of the fixed scroll member 41
A suction chamber 49 is defined between b and the outermost peripheral portion of the movable scroll wall 45b of the movable scroll member 45. A suction flange 50 having a suction port 50a is integrally formed on the outer peripheral surface of the first housing structure 21. An external pipe connected to an evaporator of an external refrigerant circuit (not shown) is connected to the suction port 50a. The suction port 50a and the suction chamber 49 are connected via a suction passage 51 formed from the suction flange 50 to the fixed scroll member 41.

In the fixed scroll member 41, the suction passage 51 is provided in a portion where annular spaces of the space 42 are separated so as to avoid the heat insulating space 42. That is, the heat insulating space 42 is provided in the housing 11 so as to be isolated from the refrigerant gas atmosphere.

A discharge chamber 52 is defined in the closed space 12 by joining the second housing structure 22 and the fixed scroll member 41. The discharge chamber 52 is shielded from the outside by the fixed scroll member 41 abutting against the compression mechanism holding surface 25b of the second housing structure 22 via the inner peripheral portion of the gasket 31. There is. That is, in the housing 11, the seal of the closed space 12 and the seal of the discharge chamber 52 are performed on the same plane, and a common gasket 31 is used for both seals.

A discharge flange 53 having a discharge port 53a is integrally formed on the outer peripheral surface of the second housing structure 22. An external pipe connected to a condenser of an external refrigerant circuit (not shown) is connected to the discharge port 53a. The discharge chamber 52 and the discharge port 53a are the same as the discharge flange 53.
It is connected via the discharge passage 54 formed in. A discharge hole 41e is formed in the center of the fixed scroll member 41, and the compression chamber 47 and the discharge chamber 52 on the center side are connected via the discharge hole 41e. A discharge valve 55, which is a reed valve for opening and closing the discharge hole 41e, is provided in the fixed scroll member 41 in the discharge chamber 52. The opening degree of the discharge valve 55 is regulated by a retainer 56 fixedly arranged on the fixed scroll member 41.

When the rotary shaft 33 is rotationally driven by the motor unit 13, in the compression mechanism 14, the movable scroll member 45 is revolved around the axial center of the fixed scroll member 41 via the eccentric shaft 43. . At this time, the movable scroll member 45 is prevented from rotating by the rotation preventing mechanism 48, and only the revolution movement is permitted. By the orbital motion of the movable scroll member 45, the compression chamber 47 is moved from the outer peripheral side of the scroll walls 41c, 45b of both scroll members 41, 45 to the center side while reducing the volume,
The refrigerant gas taken into the compression chamber 47 from the suction chamber 49 is compressed. The compressed refrigerant gas is discharged through the discharge hole 41e.
Is discharged to the discharge chamber 52 through the discharge valve 55 and then discharged to the external refrigerant circuit through the discharge passage 54 and the discharge port 53a.

The present embodiment having the above-described structure has the following effects. (1) A seal at the joint between the first housing constituent 21 and the second housing constituent 22, that is, a seal in the closed space 12, and a seal at the joint between the compression mechanism 14 and the second housing constituent 22, that is, the discharge chamber 52. A common gasket 31 is used for the seal. Therefore, the seal structure of the electric compressor can be simplified and the number of parts can be reduced.

(2) In the closed space 12, the space defined by the joint between the compression mechanism 14 and the second housing structure 22 is used as the discharge chamber 52. Therefore, the discharge chamber 52
The high pressure inside the compression mechanism 14 (fixed scroll member 41)
Is applied in the direction of pressing against the compression mechanism holding surface 23c, so that the compression mechanism 14 is more securely fixed. Therefore, in each of the housing structures 21 and 22, the compression mechanism 14 can be securely fixed without high precision machining of the compression mechanism holding surfaces 23c and 25b, and the processing cost of the housing structures 21 and 22 can be increased. Can be reduced.

(3) In the second housing structure 22, the joint surfaces 25a, 29 with the first housing structure 21 are formed.
The joint surface (compressing mechanism holding surface) 25b between a and the compression mechanism 14 (fixed scroll member 41) exists on the same plane. Therefore, the flat gasket 31 is used as a seal member.
It becomes easy to adopt the method described in (1), and the commonization of the seal member described in (1) above can be easily realized at low cost.

(4) Joining surfaces 23d, 28a of the first housing component 21 with the second housing component 22
And the joint surface 41f of the compression mechanism 14 with the second housing structure 22 is on the same plane. Therefore, it becomes easy to adopt the flat gasket 31 as the seal member, and the common use of the seal member described in (1) above can be easily realized at low cost.

(5) The compression mechanism 14 is sandwiched and fixed between the compression mechanism sandwiching surfaces 23c and 25b of the first housing component 21 and the second housing component 22 in the closed space 12. Therefore, a fixing tool such as a bolt is not required to fix the compression mechanism 14 to the housing 11, and the configuration of the electric compressor can be simplified. In addition, the compression mechanism 14 can be fixed to the housing 11 at the same time when the first housing structure 21 and the second housing structure 22 are joined and fixed, and the assembly process of the electric compressor can be simplified.

(6) The compression mechanism 14 is a scroll type. The scroll type compression mechanism 14 has advantages of small size, high efficiency, and low noise as compared with, for example, a piston type compression mechanism.

The following embodiments can be carried out without departing from the spirit of the present invention. -In the second housing structure 22, the joint surfaces 25a and 29a with the first housing structure 21 and the compression mechanism 14
The joint surface (compressing mechanism holding surface) 25b with the (fixed scroll member 41) may be arranged with a slight step. A slight step between the joint surfaces 25a, 29a and the joint surface 25d can be covered by the deformation of the gasket 31, and the flat gasket 31 can still be adopted as the seal member.

Second in first housing structure 21
The joint surfaces 23d and 28a with the housing structure 22 and the joint surface 41f with the second housing structure 22 in the compression mechanism 14 may be arranged with some steps. A slight step between the joint surfaces 23d and 28a and the joint surface 41f can be covered by the deformation of the gasket 31, and the flat gasket 31 can be used as the seal member.

The housing 11 is not limited to be configured by the two housing components 21 and 22. For example, the first housing component 21 is divided into a cylindrical portion 23 and a bottom portion 24. Alternatively, the housing 11 may be composed of three or more housing components.

The compression mechanism is not limited to the scroll type, and any type such as a piston type, a vane type or a helical type may be adopted.

The present invention is not limited to being embodied as an electric compressor having an electric motor built therein, and may be, for example, a compressor of a type driven by an engine (internal combustion engine) which is a traveling drive source of a vehicle. May be embodied in.

The present invention is not limited to being embodied in a compressor used in a vehicle air conditioner, but may be embodied in a compressor used in a home air conditioner, for example.

The present invention is not limited to being embodied in a compressor used in an air conditioner, and is embodied in a refrigeration cycle other than an air conditioner, that is, a compressor used in a refrigeration cycle of a refrigerator or a freezer, for example. May be turned into.

The present invention is not limited to being embodied in a compressor used in a refrigeration cycle, but may be embodied in an air compressor used in, for example, an air suspension device of a vehicle.

[0058]

According to the present invention having the above structure, the seal at the joint between the first housing component and the second housing component and the seal at the joint between the compression mechanism and the second housing component are common. Is used. Therefore, the seal structure of the compressor can be simplified and the number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an electric compressor.

FIG. 2 is an enlarged view of the vicinity of a compression mechanism in FIG.

[Explanation of symbols]

11 ... Housing, 14 ... Compression mechanism, 21 ... 1st housing structure, 22 ... 2nd housing structure, 31 ... Gasket as seal member, 52 ... Discharge chamber.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroyuki Motonami             2-1, Toyota-cho, Kariya City, Aichi Stock Association             Inside Toyota Toyota Industries (72) Inventor Kazuhiro Kuroki             2-1, Toyota-cho, Kariya City, Aichi Stock Association             Inside Toyota Toyota Industries (72) Inventor Satoshi Egashira             2-1, Toyota-cho, Kariya City, Aichi Stock Association             Inside Toyota Toyota Industries (72) Inventor Satoshi Nagakawa             2-1, Toyota-cho, Kariya City, Aichi Stock Association             Inside Toyota Toyota Industries (72) Inventor Yoshikazu Fukuya             2-1, Toyota-cho, Kariya City, Aichi Stock Association             Inside Toyota Toyota Industries F-term (reference) 3H003 CD01                 3H029 AA02 AA15 AB02 AB03 BB16                       BB32 CC02 CC07 CC09 CC19                 3H039 AA02 AA04 AA12 BB08 BB15                       CC01 CC31 CC32 CC33

Claims (6)

[Claims] 1. A compressor in which a compression mechanism is housed in a housing formed by joining and fixing a plurality of housing constituents, and gas compression is performed by operating the compression mechanism. Is a tubular first housing component in which the compression mechanism is disposed, and a first housing component that is joined to close the tubular opening, and is joined to the compression mechanism to form the compression mechanism. Second to divide and form discharge chamber
A housing member is provided, and a seal member is interposed at a joint portion between the first housing member and the second housing member, and an inner peripheral portion of the seal member is provided from a joint portion between the two housing members to a housing. It is extended inward, and the extended portion is the compression mechanism and the second
A compressor characterized by being interposed at a joint with a housing structure. 2. The compressor according to claim 1, wherein, in the second housing structure, a joint surface with the first housing structure and a joint surface with the compression mechanism are substantially on the same plane. 3. The second of the first housing assembly.
Second surface of the compression mechanism and the joint surface with the housing structure
The compressor according to claim 1 or 2, wherein the joint surface with the housing structure is substantially coplanar. 4. A compression mechanism sandwiching surface is formed in the first housing constituent member in the housing so as to face a joint surface of the second housing constituent member with the compression mechanism. Is brought into contact with the compression mechanism holding surface of the first housing component by joining and fixing the first housing component and the second housing component,
Claim 1 which is clamped and fixed between both housing components.
The compressor according to any one of 3 above. 5. The compressor according to claim 1, wherein the compression mechanism is driven by an electric motor, and the electric motor is housed in a housing together with the compression mechanism. 6. The discharge mechanism is a scroll type, and a fixed scroll member constituting the compression mechanism is joined to a second housing structure, so that a discharge chamber is defined in the housing surrounded by the two members. The compressor according to any one of claims 1 to 5, which is formed.