JP2001003882A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor advantageous in cost and improved in reliability through the suppression of sliding friction by providing the sliding surfaces of a fixed scroll and a turning scroll with a plurality of recesses by press working. SOLUTION: In this scroll compressor, a motor and a compression part are arranged in a closed container, and the compression part is formed into a plurality of compression chambers by engaging a fixed scroll 4 and a turning scroll 6 provided with spiral laps 4b, 6b erectly inside end plates 4a, 6a. The turning scroll 6 is put in revolving motion while being hindered from its rotation and slidably supported to a thrust bearing formed at a main frame, and either one or both of the fixed scroll 4 and turning scroll 6 are formed of aluminum or an aluminum alloy. A plurality of recessed parts 10 are provided at the tip faces of both laps 4b, 6b of the fixed scroll 4 and turning scroll 6 and at the inner bottom faces of both end plates 4a, 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to providing a plurality of recesses on sliding surfaces of a fixed scroll and an orbiting scroll to improve the wear resistance and reliability of the sliding portion. Regarding possible structures.

[0002]

2. Description of the Related Art A conventional scroll compressor is shown in FIG.
As shown in FIG. 2, an electric motor 22 and a compression unit 23 are arranged in a closed container 21. The compression unit 23 includes a fixed scroll 24, an orbiting scroll.
26, main frame 27, Oldham ring 28, crankshaft
29, an eccentric bearing 30, and a shaft 31. In this structure, a fixed scroll wrap 24b having a spiral shape is integrally formed on a fixed scroll head plate 24a, and a fixed scroll 24 fixed to a main frame 27 and a spiral scroll wrap 26b fixed to a orbiting scroll head plate 26a.
A plurality of compression chambers 25 are formed by meshing the orbiting scroll 26 integrally formed with a orbiting drive shaft 26c on the back surface with the orbiting scroll wrap 26b inside.

When the electric motor 22 rotates, the main frame 27
The orbiting scroll 26 is rotated by an Oldham ring 28 by an orbiting drive shaft 26c through an eccentric bearing 30 formed on an upper part of a shaft 31 mounted on the shaft 31 while preventing rotation.
The low-pressure refrigerant sucked into the compression unit 23 by the orbiting movement of the orbiting scroll 26 is compressed while moving sequentially from the outer peripheral portion to the central portion of the compression chamber 25 to become a high-pressure refrigerant.

In the above configuration, the fixed scroll head 24
a and orbiting scroll wrap 26b and orbiting scroll head
Sliding friction occurs on the sliding surface between the fixed scroll wrap 26b and the fixed scroll wrap 24b. Further, similar friction occurs between the rear surface of the orbiting scroll head plate 26a and the thrust bearing 32 of the main frame 27. The fixed scroll 24
The orbiting scroll 26 often uses aluminum or an aluminum alloy material for weight reduction. When the friction progresses on the sliding surface, leakage of refrigerant or the like increases, the compression efficiency decreases, and the performance deteriorates.

As a countermeasure against this, Japanese Patent Laid-Open Publication No. Sho 63 discloses a method in which a hard coating such as alumite treatment is applied to the surface of the orbiting scroll 26 and a hard abrasion-resistant plate a is used for the fixed scroll head 24a. No. -25345. However, the above configuration has a problem that the number of parts increases and the cost is disadvantageous.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a plurality of recesses formed by press working on a sliding surface between a fixed scroll and an orbiting scroll and a thrust receiving surface of the orbiting scroll. It is an object of the present invention to provide a scroll compressor which suppresses sliding friction, improves reliability, and is cost-effective.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. An electric motor and a compression section are arranged in a closed container, and the compression section is provided with a spiral wrap inside a head plate. A plurality of compression chambers are formed by interlocking the fixed scroll and the orbiting scroll having the uprights formed therein, and the orbiting scroll performs a revolving orbiting motion while preventing its rotation, and slides on a thrust bearing formed on the main frame. A scroll compressor comprising a shaft movably supported and driving the orbiting scroll by the electric motor, wherein one or both of the fixed scroll and the orbiting scroll are formed of aluminum or an aluminum alloy; And a plurality of recesses on the tip surfaces of both wraps of the orbiting scroll and on the inner bottom surfaces of both end plates. It has become the only configuration.

Further, the recess is formed by press working.

[0009] Further, the press working of the concave portion is performed after the finishing work of the wrap.

Further, the recess is formed in a hemispherical shape, a conical shape or a long hole shape.

Further, the width of the recess is smaller than the width of the wrap.

The depth of the concave portion is set to 5 to 20 μm.

Further, the recess is filled with a solid self-lubricating agent.

[0014] Further, the structure is such that molybdenum is used for the self-lubricating agent.

[0015] The surface of the aluminum base is subjected to hard alumite treatment.

Further, the orbiting scroll has a configuration in which the plurality of recesses are provided on a thrust surface on the main frame side.

Further, the concave portions on the distal end surfaces of the wraps of the fixed scroll and the orbiting scroll are formed in a spiral shape.

Further, the concave portions on the inner bottom surfaces of the two end plates are formed in a spiral shape.

Further, the orbiting scroll has a configuration in which the concave portion of the thrust receiving surface on the main frame side is formed spirally or radially.

Further, the depth of the concave spiral or radial concave portion is set to 3 to 10 μm.

Further, the press die corresponding to the concave portion has a configuration in which a convex portion is provided on the outer periphery of the convex portion.

[0022]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 and FIG.
2 (A) and FIG. 2 (B), an electric motor 2 and a compression section 3 are arranged in a closed container 1, and the compression section 3 is fixed to a fixed scroll 4 having a spiral wrap 4b on an end plate 4a. A revolving scroll 6 having a swirling wrap 6b on a head plate 6a forming a plurality of compression chambers 5 in mesh with the scroll 4 and a slidable support of the revolving scroll 6 by forming a thrust bearing 7a. An Oldham ring 8 for orbiting the orbiting scroll 6 while preventing the orbiting scroll 6 from rotating, and a shaft 9 for driving the orbiting scroll 6 by the electric motor 2. Either one or both are formed of aluminum or aluminum alloy.

The tip surfaces of the wraps 4b, 6b of the fixed scroll 4 and the orbiting scroll 6, and the end plates
A plurality of recesses 10 are provided on the inner bottom surfaces (sliding surfaces) of 4a and 6a by press working.
It is configured to be performed after finishing processing of b and 6b.

As shown in FIGS. 3A to 3C, the concave portion 10 is formed in a hemispherical shape, a conical shape or a long hole shape, and the width b of the concave portion 10 is larger than the width of the wraps 4b and 6b. It is configured to have a small size and a depth of 5 to 20 μm.
Further, as shown in FIG. 4, by filling the recess 10 with a solid self-lubricating agent 11 such as molybdenum, the reliability of the sliding portion at the time of initial startup can be improved.

By subjecting the surface of the aluminum base material to a hard alumite treatment, the wear resistance and reliability of the sliding portion can be further improved.

Further, by providing the plurality of recesses 10 in the thrust receiving surface 6c of the orbiting scroll 6 on the main frame 7 side, a sliding loss between the main frame 7 and the orbiting scroll 6 can be reduced. .

FIG. 5 shows another embodiment according to the present invention, in which the front end surfaces of both wraps 4b, 6b of the fixed scroll 4 and the orbiting scroll 6, and the concave portions on the inner bottom surfaces of both end plates 4a, 6a are shown. The orbiting scroll 6 is formed with a spiral or radial groove 12 on the main frame side thrust receiving surface 6c. The groove 12 has a depth of 3 to 10 μm.

FIG. 6 shows the relationship between the press die according to the present invention and the finish of the concave portion 10. As shown in FIG. 6A, when the outer periphery of the convex portion of the press die P1 is flattened, Four
Pressing a, 6a results in a projection q1 around the recess 10. Therefore, as shown in FIG.
By forming a ridge q2 on the outer periphery of the ridge and pressing, a dent is formed around the dent 10, and the end plates 4a and 6a can be flattened.

In the above configuration, a plurality of recesses 10 are formed by press working on the sliding surface between the fixed scroll 4 and the orbiting scroll 6 and the thrust receiving surface 6c of the orbiting scroll 6 corresponding to the thrust bearing of the main frame 7. As a result, the sliding friction is suppressed to improve reliability, the oil seal in the axial gap between both wraps 4b and 6b is improved, initial break-in is reduced, and start-up failure is prevented, and the number of parts is reduced. The scroll compressor is advantageous in terms of cost without increasing the cost.

[0030]

As described above, in the present invention, a plurality of recesses are formed by pressing on the sliding surface between the fixed scroll and the orbiting scroll and the thrust receiving surface of the orbiting scroll corresponding to the thrust bearing of the main frame. The configuration reduces sliding friction and improves reliability, improves the oil seal in the gap between both laps in the axial direction, reduces initial break-in, prevents startup failure, and increases the number of parts. It is a cost effective scroll compressor.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a scroll compressor according to the present invention.

FIG. 2 is an enlarged view of a main part showing an embodiment of the present invention, (A) is a top view of a fixed scroll, (B) is a cross-sectional view of (A),
(C) is a top view of the orbiting scroll, and (D) is a cross-sectional view of (C).

FIG. 3 shows an embodiment of a concave shape according to the present invention;
(A) is hemispherical, (B) is conical, and (C) is oval.

FIG. 4 is a sectional view showing a state in which a self-lubricating agent is embedded in a concave portion according to the present invention.

FIG. 5 shows another embodiment of the present invention, wherein (A)
Is a top view of the fixed scroll, (B) is a top view of the orbiting scroll, and (C) is a rear view of the orbiting scroll.

FIGS. 6A and 6B are cross-sectional views of a press die according to the present invention, wherein FIG.

FIG. 7 is a longitudinal sectional view of a scroll compressor according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Electric motor 3 Compression part 4 Fixed scroll 4a Fixed scroll end plate 4b Fixed scroll wrap 5 Compression chamber 6 Orbiting scroll 6a Orbiting scroll end plate 6b Orbiting scroll wrap 6c Thrust receiving surface 7 Main frame 7a Thrust bearing 8 Oldham ring 9 Shaft 10 Recess 11 Self-lubricating agent

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Junya Tanaka 1116 Suenaga, Takatsu-ku, Kawasaki F-Term in Fujitsu General Limited (Reference) 3H039 AA03 AA06 AA12 BB04 BB07 BB11 BB15 BB28 CC05 CC08 CC22 CC27 CC34 CC35 CC36 CC41

Claims (15)

[Claims] 1. An electric motor and a compression unit are arranged in a closed container,
A fixed scroll having a spiral wrap standing inside a head plate and a orbiting scroll are meshed with each other to form a plurality of compression chambers in the compression section, and the orbiting scroll revolves orbits while preventing its rotation. And a shaft slidably supported by a thrust bearing formed on a main frame, and a shaft for driving the orbiting scroll by the electric motor. One or both of the fixed scroll and the orbiting scroll are made of aluminum or aluminum. A scroll compressor made of an alloy, wherein a plurality of recesses are provided on the distal end surfaces of both wraps of the fixed scroll and the orbiting scroll and on the inner bottom surfaces of both end plates. 2. The scroll compressor according to claim 1, wherein said recess is formed by press working. 3. The scroll compressor according to claim 1, wherein the pressing of the concave portion is performed after the finishing of the wrap. 4. The scroll compressor according to claim 1, wherein said concave portion is formed in a hemispherical shape, a conical shape or a long hole shape. 5. The scroll compressor according to claim 1, wherein the width of the recess is smaller than the width of the wrap. 6. The scroll compressor according to claim 1, wherein the depth of the recess is 5 to 20 μm. 7. The scroll compressor according to claim 1, wherein said concave portion is filled with a solid self-lubricating agent. 8. The scroll compressor according to claim 1, wherein molybdenum is used as the self-lubricating agent. 9. The scroll compressor according to claim 1, wherein a hard alumite treatment is applied to a surface of said aluminum base material. 10. The scroll compressor according to claim 1, wherein the plurality of recesses are provided in a thrust surface on a main frame side of the orbiting scroll. 11. The scroll compressor according to claim 1, wherein the concave portions on the distal end surfaces of the wraps of the fixed scroll and the orbiting scroll are formed in a spiral shape. 12. The scroll compressor according to claim 1, wherein the concave portions on the inner bottom surfaces of both the end plates of the fixed scroll and the orbiting scroll are formed in a spiral shape. 13. The scroll compressor according to claim 1, wherein the concave portion of the thrust receiving surface on the main frame side of the orbiting scroll is formed in a spiral or radial shape. 14. The helical or radial concave portion has a depth of 3 to 10 μm.
14. The scroll compressor according to 1, 12, or 13. 15. The scroll compressor according to claim 1, wherein a convex ridge is provided on an outer periphery of the convex portion of the press die corresponding to the concave portion.