JP2756808B2 - Oldham coupling structure of scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an Oldham coupling structure of a scroll compressor having projections which are respectively engaged with an orbiting scroll and a casing.

[Conventional technology]

The scroll compressor forms a closed compression chamber between the spiral wrap of the fixed scroll fixed to the casing side and the wrap of the same shape of the orbiting scroll that orbits while meshing with the fixed scroll, and discharges the compressed medium at a predetermined pressure. It is formed as follows. The orbiting scroll is eccentrically rotated by the crankshaft, and moves in a state where the orbiting motion is regulated by the Oldham coupling which is locked to the casing side and the orbiting scroll. The Oldham coupling has a projection formed so as to project in a direction perpendicular to each other, and the projection is engaged with the casing and the orbiting scroll to perform a predetermined orbital movement. In the prior art,
In particular, in the case of water cooling, the Oldham coupling is generally formed of stainless steel, and a receiving member made of ordinary carbon is generally provided in a sliding contact portion on the casing side and the orbiting scroll side in contact with the projection.

[Problems to be solved by the invention]

Since frictional force acts between the receiving member on the casing side and the orbiting scroll side and the projection of the Oldham coupling,
Mutual wear occurs. If a certain amount of wear occurs, the turning movement of the orbiting scroll will not be performed smoothly, and vibration and noise will be generated. When the thrust portion of the orbiting scroll is worn and a gap is formed between the orbiting scroll and the fixed scroll, it is possible to eliminate the gap by pressing the orbiting scroll toward the fixed scroll by the pressing means engaging with the orbiting scroll. Is possible. However, if a gap is formed between the Oldham coupling and the receiving member, it is structurally difficult to provide a pressing means or the like for reducing the gap. Therefore, it has been demanded to use a material having little wear.

The present invention has been made in view of the above requirements,
It is an object of the present invention to provide an Oldham coupling structure of a scroll compressor which has abrasion resistance and can prevent generation of vibration and noise.

[Means for solving the problem]

The present invention relates to a fixed scroll fixed to a casing, an orbiting scroll meshing with the fixed scroll to form a sealed compression chamber, an adapter fixed to the casing, and the orbiting scroll to achieve the above object. An Oldham coupling having a projection for stopping, and an Oldham coupling structure of a scroll compressor configured to discharge a compression medium at a predetermined pressure while restricting the orbiting movement of the orbiting scroll with the Oldham coupling. A receiving member formed by stacking a large number of carbon fibers on the adapter and the orbiting scroll sliding contact portion in contact with the protrusion of the Oldham coupling along the direction in which the protrusion of the Oldham coupling protrudes with a resin agent, Or it has cobalt or nickel as its main component and has subcomponents containing molybdenum, chromium, silicon, carbon, etc. And provided with a receiving member which is covered with a member having abrasion resistance, constitutes the Oldham coupling structure of a scroll compressor comprising the Oldham coupling is made of stainless material.

[Action]

A receiving member formed by stacking carbon fibers along the protruding direction of the protruding portion with a resin agent has a characteristic of excellent abrasion resistance, and even if an Oldham coupling made of stainless steel is in sliding contact with the receiving member. Only a small amount of wear occurs. Further, by providing a coating portion made of a specific member having corrosion resistance and wear resistance on the Oldham joint side, wear of both members is further reduced.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, the schematic structure of a scroll compressor to which this embodiment is applied will be described with reference to FIG.

A fixed scroll 14 erected from a spiral wrap 13 is fixed to a casing 15. The orbiting scroll 9 also having a spiral wrap 11 meshes with the fixed scroll 14,
The closed compression chamber 16 is formed while rotating, and the compressed medium compressed to a predetermined pressure is discharged. End plate of orbiting scroll 9
The bearing 17 is provided on the boss 12 protruding from the
The crankshaft 17 is fitted through the
It is formed eccentrically on the tip side of 19. The rotating shaft 19 is a bearing
The casing 15 is pivotally supported by 20, 21. An adapter 22 and an Oldham coupling 4 are provided around the boss portion 12 so as to surround the boss portion 12. Adapter 22 is a casing
The thrust members 23 and 24 are provided between the adapter 22 and the orbiting scroll 9 to support the orbiting scroll 9 in the thrust direction.

As shown in FIG. 5, the Oldham coupling 4 has protrusions 5a and 5b formed at positions orthogonal to the ring-shaped member.
The protruding portions 5a and 5b are engaged with the orbiting scroll 9 and the adapter 22, respectively, and are in sliding contact therewith.

FIG. 2 and FIG. 3 show details around the sliding contact portion of the Oldham coupling 4 which is engaged with the orbiting scroll 9,
A similar structure is formed between the adapter 22 and the Oldham coupling 4, but only the orbiting scroll 9 will be described below.

As shown in FIG. 2, a concave groove 8 is formed in the orbiting scroll 9 along the radial direction, and two pairs of receiving members 1 opposed to each other are disposed in the concave groove 8. A gap 7 is formed between the pair of receiving members 1, and a projection of the Oldham coupling 4 is formed in the gap 7.
5a is inserted and comes into sliding contact.

As shown in FIG. 4, the receiving member 1 is formed by stacking a large number of carbon fibers 2 along a projecting direction of the projection 5a and then folding the stacked carbon fibers 2 from a resin material such as epoxy resin. 8 fixed to the orbiting scroll 9.

The reason why the stacked carbon fibers 2 are arranged in the above-mentioned direction and fixed in the concave groove 8 is that it is proved that the structure having such a wear resistance is superior, and This is because it is easy to make.

The protrusion 5a of the Oldham coupling 3 moves while sliding on the receiving member 1 along the direction perpendicular to the paper surface of FIG. 3, but the combination of the above structures can reduce the wear as compared with the prior art, and reduce vibration and noise. Can be prevented.

In the case of the above-mentioned embodiment, the Oldham joint 4 is made of a non-hardening stainless steel material, but a material as shown in FIG. 7 is employed to further improve the wear resistance. In this case, a sliding contact portion of the projection 5a of the Oldham's joint 4 is provided with a coating portion 3 called tribaloy. Tribaloy is a registered trademark of Capot Corporation in the United States, and is used as a powder for plasma spraying or powder metallurgy, as a welding rod for surface hardening, a raw material for melting, and a raw material for casting. Therefore, it can be spray-fixed to the surface of a certain member and can be manufactured as a single molded product. Its component is one containing cobalt or nickel as a main component and molybdenum, chromium, silicon, carbon or the like as an auxiliary component. It has been demonstrated that the properties are excellent in corrosion resistance and abrasion resistance, and, for example, the corrosion resistance shows a value about three orders of magnitude smaller in the case of hydrochloric acid aqueous solution than in the case of stellite. As for wear resistance, it shows a low coefficient of friction with tool steel, low alloy steel, yellow steel, aluminum alloy, superalloy, graphite, etc., and also shows wear on the anti-hand side as well as carbide or ceramics itself. It has the property of significantly reducing. Tribaloy can be easily finished using a grinding wheel made of carbide tools, aluminum oxide, silicon carbide, etc., and does not require a diamond grinding wheel.

By providing the coating 3 on the Oldham's joint 4, the wear resistance is improved, and the effect of greatly reducing the amount of wear can be obtained.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, the wear of the Oldham coupling and the portion in sliding contact with the Oldham coupling can be significantly reduced, and the generation of vibration and noise can be prevented.

[Brief description of the drawings]

FIG. 1 is an axial sectional view showing an overall structure of a scroll compressor to which an embodiment of the present invention is applied, FIG. 2 is a plan view showing a mounting state of a receiving member to an orbiting scroll, and FIG. FIG. 3 is an enlarged partial sectional view taken along the line III-III of FIG. 2 showing a detailed structure;
FIG. 4 is a perspective view of a receiving member, FIG. 5 is a plan view of an Oldham coupling, FIG. 6 is a side view of the Oldham coupling, and FIG. 7 is a partially enlarged view showing an Oldham coupling structure according to another embodiment of the present invention. It is sectional drawing. 1 ... receiving member, 2 ... carbon fiber, 3 ... coating part,
4 ... Oldham coupling, 5a, 5b ... projection, 6 ... groove,
7 ... gap, 8 ... screw, 9 ... orbiting scroll, 10 ...
… End plates, 11, 13… wrap, 12… boss, 14… fixed scroll, 15… casing, 16… sealed compression chamber, 1
7,20,21 …… Bearing, 18 …… Crankshaft, 19 …… Rotating shaft, 2
2 ... Adapter, 23,24 ... Thrust member.

Claims (2)

(57) [Claims] 1. A fixed scroll fixed to a casing, an orbiting scroll meshed with the casing to form a closed compression chamber, and a projection fixed to the adapter and the orbiting scroll fixed to the casing, respectively. An Oldham coupling structure of a scroll compressor configured to discharge a compression medium having a predetermined pressure while restricting the orbiting movement of the orbiting scroll with the Oldham coupling. A large number of carbon fibers are stacked on the abutting adapter and the orbiting scroll sliding contact portion along the projecting direction of the protrusion of the Oldham coupling. The Oldham coupling structure of a scroll compressor, characterized by being formed of stainless steel. 2. A sliding surface of a projection of the Oldham's joint, which is in sliding contact with the adapter and the orbiting scroll, contains cobalt or nickel as a main component and contains subcomponents such as molybdenum, chromium, silicon, and carbon, and has corrosion resistance and wear resistance. The Oldham coupling structure for a scroll compressor according to claim 1, wherein a coating portion made of a member having a property is provided.