JP2002349457A - Scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll type compressor capable of improving processability and lubricity by forming an oil holding part on a sliding surface of a key of an oldham ring. SOLUTION: In the scroll type compressor, an electric motor and a compressing part are disposed in a hermetically closed vessel, the compressing part comprises a fixed scroll, a turning scroll for forming a plurality of compressing chambers by being fitted to the fixed scroll, a main frame having a thrust bearing for slidably supporting the turning scroll, and the annular oldham ring 7 for revolving and turning the turning scroll while preventing its rotation, mutually orthogonal projecting keys are formed on both surfaces of the oldham ring 7, and key grooves engaging with the keys to slide the keys are mutually orthogonally formed in the back surface of the turning scroll and the main frame side. Oil holding parts 7d for holding lubricating oil are formed in both surface 7c of a key 7a sliding with the turning scroll and/or the key groove of the main frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compressor used for an air conditioner or the like, and more particularly, to a lubricating system which reliably lubricates sliding surfaces of keys and keyways of an Oldham ring. The present invention relates to a structure of an oil groove for improvement.

[0002]

2. Description of the Related Art Conventional scroll compressors of this kind are:
For example, one disclosed in JP-A-10-159760 is known. As shown in FIGS. 8 and 9, a compression unit 22 and an electric motor 23 are housed in a closed container 21. In the compression section 22, a compression chamber is formed by engaging the fixed scroll 24 with the orbiting scroll 25. The fixed scroll 24 includes a wrap 24b erected on a head plate 24a, a discharge port 26 formed in a central portion, and a suction port 27 provided in an outer peripheral portion.
On the other hand, the orbiting scroll 25 is also wrapped upright on the end plate 25a.
25b and a boss 25c formed on the back surface of the end plate 25a.

[0003] A frame 28 has a bearing portion formed at the center thereof, and a main shaft 29 is supported by the bearing portion. An eccentric shaft at the tip of the main shaft 29 is inserted into a boss 25C of the orbiting scroll 25 to perform an orbiting motion. A fixed scroll 24 is fixed to the frame 28 by bolts, and the orbiting scroll 25 is an Oldham ring.
The frame 30 is supported by a frame 28 by the rotation of the fixed scroll 24 without rotating. The oil in the oil reservoir 36 at the bottom of the sealed container 21 is supplied to a sliding portion such as a bearing through an oil supply pipe 37 and an oil supply hole 29a due to a difference between the discharge pressure and the pressure of the back pressure chamber 34.

The sliding part of the Oldham ring forming the rotation preventing mechanism includes a key groove 25d of the orbiting scroll 25, a key 30a of the Oldham ring 30, and a key groove of the frame 28.
28a and a key 30b on the opposite side of the Oldham ring 30, the keyway and the key perform a linear reciprocating motion. Groove-shaped oil holding portions 39 are formed at both ends of a sliding portion of the key groove 28a of the frame 28 with the key 30a of the Oldham ring 30.

In the above configuration, the splashed oil adheres to the key groove 28a, and this oil lubricates between the key 30a and the key groove 28a, but the Oldham ring 30 reciprocates with respect to the frame 28. Due to the movement, the sliding speed always becomes zero at both ends of the sliding portion. Therefore, key 30a and keyway 28a
An oil film is less likely to form between them, but since oil is held at both ends of the sliding portion by the oil holding portion 39, the oil film does not break,
Effective lubrication is performed without increasing the amount of supplied oil.

However, in the case of the above configuration, the oil holding portion
Since 39 is provided in the key groove 28a, the workability is poor and the cost is disadvantageous. In addition, there is a problem that the lubrication is deteriorated due to the one-sided contact of the key.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an oil retaining portion formed on a sliding surface of a key of an Oldham ring, thereby improving workability and improving lubricity. It is an object of the present invention to provide a scroll compressor that can be improved.

[0008]

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 on the inner surface of a head plate. A main frame having a fixed scroll on which a fixed scroll is provided, a orbiting scroll that meshes with the fixed scroll to form a plurality of compression chambers, a thrust bearing that slidably supports the orbiting scroll, and the orbiting scroll. A ring-shaped Oldham ring that makes a revolving revolution while preventing its rotation, forming a projecting key orthogonal to each other on both surfaces of the Oldham ring, and a key groove that engages with the key and slides, In a scroll type compressor formed to be orthogonal to each other on the orbiting scroll rear surface and the main frame side, the orbiting scroll and / or It has a structure in which an oil holding portion for holding the lubricating oil to both sides of the key the key groove and the sliding-frame.

Further, the oil holding portion is formed in a groove shape extending between upper and lower ends of the key.

Further, the groove-shaped portion is formed in a straight line, a curved line, or an inclined line.

Further, the oil holding portion is formed in a concave shape.

The cross section of the concave portion is formed in a V-shape, a rectangular shape or an arc shape.

Further, the oil holding portion is formed by a through hole penetrating from one side surface to the other side surface of the key.

[0014] Further, a plurality of the oil holding portions are provided.

Further, a groove-shaped oil retaining portion is provided on both side surfaces of the orbiting scroll sliding with the key and / or the key groove of the main frame.

Also, the key and the oil retaining portion of the key groove are formed so that the groove width and the pitch between the groove widths are different.

Further, the Oldham ring is formed by molding a sintered metal or die cast.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as examples. FIG. 1 is a cross-sectional view of a scroll type compressor according to the present invention, FIG. 2 is a development view of a main part of a compression unit in the present invention, and FIG. In the figure, an electric motor 2 and a compression unit 3 are arranged in a closed container 1, and the compression unit 3 is a fixed scroll 4 in which a spiral wrap 4b is erected on the inner surface of a head plate 4a.
Similarly, a spiral wrap 5b is erected on the inner surface of the end plate 5a and meshes with each other to form a compression chamber 6, and the orbiting scroll 5 is prevented from rotating and revolved. Oldham ring 7 and mainframe 8
The end plate 5a of the orbiting scroll 5 is mounted on the bearing 8a
Insert the scroll shaft 5c provided on the back of the
And an oil feed passage 10 for supplying lubricating oil from the oil reservoir 11 at the bottom of the sealed container 1 to the compression unit 3 at the tip thereof, and an eccentric inserted into the scroll shaft 5c at the tip. And a shaft 9 on which a shaft 9a is formed.

The main frame 8 has an annular thrust bearing 8b slidably supporting the orbiting scroll 5 on the outer periphery of the bearing 8a, and separates the bearing 8a from the outer back pressure chamber 8c. Further, linear key grooves 8d are provided to face each other.

The orbiting scroll 5 is provided with a scroll shaft 5c provided with an orbiting bearing 5d inside on the back surface of the end plate 5a, and an eccentric shaft at the tip of the shaft 9 is provided on the scroll shaft 5c.
9a is inserted. Further, linear key grooves 5e are provided to face each other.

The Oldham ring 7 forming a rotation preventing mechanism is formed with projecting keys 7a and 7b orthogonal to each other on both surfaces of an annular member, and the key groove 5e of the orbiting scroll 5 is formed on the key 7a. While engaging and sliding, the key groove 8d of the main frame 8 is engaged with the key 7b and slid,
Each has a structure of performing a linear reciprocating motion. Thus, the orbiting scroll 5 orbits without rotating with respect to the fixed scroll 4.

FIG. 3 shows an embodiment of the present invention using the key 7a of the Oldham ring 7 as an example. Oil holding oil is held on both side surfaces 7c of the key 7a which slide with the key groove 5e. Part 7d
Is provided. In this embodiment, the oil holding portion 7d is formed in a linear groove shape extending between the upper and lower ends of the key 7a.

FIGS. 4A and 4B show the grooves of the oil retaining portion 7d, wherein FIG. 4A is formed in a curved shape and FIG. 4B is formed in an inclined shape. Also,
FIG. 5A shows a configuration in which the oil holding portion 7d is formed in a concave shape, and the concave portion has a V-shaped, rectangular or arcuate cross-sectional shape as shown in FIG. 5B. I have. Furthermore,
FIG. 6 shows a configuration in which the oil holding portion 7d is formed by a through hole penetrating from one side surface 7c of the key 7a to the other side surface. By providing a plurality of these oil retaining portions on both sides of the key 7a, the sliding area of the key 7a is reduced, so that the size of the key 7a can be increased accordingly, and Can be prevented, friction loss can be reduced, and lubricity can be improved.

FIG. 7A shows a grooved oil on both sides of a key groove 5e of the orbiting scroll 5 which slides with the key 7a and / or a key groove 8d of the main frame 8 which slides with the key 7b. The configuration is such that a holding portion 7d 'is provided. In addition, the groove width b and the pitch a between the groove widths of the oil holding portion 7d 'are formed to be different from each other. Further, as shown in FIG. 7B, the grooves 7 are formed so that the dimensions of the groove width d and the pitch c between the groove widths of the oil holding portions 7d of the keys 7a and 7b are different. As described above, the oil retaining portions are provided also on the key groove side, and the groove width and the pitch between the groove widths on the key side and the key groove side are formed so as to be different from each other. If performed, it is possible to prevent snagging at the edge of the groove and further improve lubricity. The Oldham ring 7 is formed of a sintered metal or die-cast to improve dimensional accuracy.

As described above, in the above configuration,
Both sides 7c sliding on the keyways 5e, 8d of the keys 7a, 7b
In addition to improving the workability, the lubricating property can be improved, and the keys 7a and 7b can be prevented from coming into contact with each other, reducing friction loss. A scroll compressor that can be reduced.

[0026]

As described above, according to the present invention, the oil retaining portions for retaining the lubricating oil are provided on both sides of the key sliding with the key groove, thereby improving the workability and improving the lubrication. The scroll compressor has improved operability, prevents one-sided hitting of keys, and reduces friction loss.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a scroll compressor according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of a compression section showing the embodiment of the present invention.

FIG. 3 is an enlarged perspective view of a main part of a key of the Oldham ring showing the embodiment of the present invention.

FIG. 4 is an enlarged perspective view of a main part of a key according to a second embodiment of the present invention, wherein FIG.
(B) is an inclined shape.

5A is a perspective view of a main part, and FIG. 5B is a sectional view of a third embodiment of the present invention.

FIG. 6 is an enlarged perspective view of a main part showing a fourth embodiment of the present invention.

FIGS. 7A and 7B are perspective views of a main part on a key groove side, and FIG. 7B is a perspective view of a main part on a key side, according to a fourth embodiment of the present invention.

FIG. 8 is a cross-sectional view of a scroll type compressor showing a conventional example.

FIG. 9 is an enlarged perspective view of a main part in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Electric motor 2a Motor room 3 Compression part 4 Fixed scroll 4a End plate 4b Wrap 5 Orbiting scroll 5a End plate 5b Wrap 5c Scroll shaft 5d Orbit bearing 5e, 8d Keyway 6 Compression chamber 7 Oldham ring 7a, 7b Key 7c Sliding surface (Side) 7d Oil holding section 8 Main frame 9 Shaft 10 Oil feed path

Claims (10)

[Claims] 1. An electric motor and a compression unit are arranged in a closed container,
A fixed scroll having a swirling wrap erected on the inner surface of the end plate, an orbiting scroll that meshes with the fixed scroll to form a plurality of compression chambers, and the orbiting scroll slidably. A main frame having a supporting thrust bearing, and an annular Oldham ring for orbiting the orbiting scroll while preventing its rotation, are formed with projecting keys orthogonal to each other on both surfaces of the Oldham ring, A scroll type compressor in which key grooves which engage and slide with the same key are formed orthogonally to each other on the orbiting scroll rear surface and the main frame side, wherein the orbiting scroll and / or the key of the main frame are formed. An oil holding portion for holding lubricating oil is provided on both sides of the key sliding with the groove. Type compressor. 2. The key holding device according to claim 1, wherein the oil holding portion is formed in a groove shape extending between upper and lower ends of the key.
The scroll-type compressor as described. 3. The scroll-type compressor according to claim 1, wherein said groove portion is formed in a straight line, a curved line, or an inclined line. 4. The scroll compressor according to claim 1, wherein said oil holding portion is formed in a concave shape. 5. The scroll compressor according to claim 1, wherein the recess has a V-shaped, rectangular or arc-shaped cross section. 6. The scroll type compressor according to claim 1, wherein said oil holding portion is formed by a through hole penetrating from one side surface of said key to another side surface. 7. The scroll type compressor according to claim 1, wherein a plurality of said oil holding portions are provided. 8. The scroll according to claim 1, wherein groove-shaped oil retaining portions are provided on both sides of said orbiting scroll sliding with said key and / or said key groove of said main frame. Type compressor. 9. The scroll compressor according to claim 1, wherein the key and the oil retaining portion of the key groove are formed so that the groove width and the pitch between the groove widths are different. 10. The method according to claim 1, wherein the Oldham ring is formed of sintered metal or die cast.
The scroll-type compressor as described.