JPH02176176A - Oldham joint structure of scroll compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an Oldham joint structure for a scroll compressor, which has protrusions that are respectively engaged with an orbiting scroll and a casing side.

[Conventional technology]

A scroll compressor forms a sealed compression chamber between the spiral wrap of a fixed scroll fixed to the casing side and the same-shaped wrap of an orbiting scroll that rotates while meshing with the spiral wrap, and discharges compressed medium at a predetermined pressure. It is formed like this. The orbiting scroll is eccentrically rotated by the crankshaft.

The Oldham joint that is engaged with the casing side and the orbiting scroll allows the scroll to move while its orbiting movement is restricted. The Oldham joint has protrusions formed to protrude in directions orthogonal to each other, and these protrusions engage with the casing and the orbiting scroll so as to rotate in a predetermined direction. In the prior art, especially in the case of water cooling, Oldham's joints are generally made of stainless steel, and receiving members made of ordinary carbon are provided at the sliding contact parts on the casing side and the orbiting scroll side where the projections come into contact. Ta.

[Problem to be solved by the invention]

Frictional force acts between the receiving members on the casing side and the orbiting scroll side and the projections of the Oldham joint, causing mutual wear. When a certain degree of wear occurs, the orbiting scroll does not rotate smoothly, vibrations and noise are generated, and further wear is accelerated. If the thrust part of the orbiting scroll is worn out and a gap is created between it and the fixed scroll, the structure is such that the orbiting scroll is pressed toward the fixed scroll by a suppressing means that engages with the orbiting scroll to eliminate the gap. above is possible. However, if a gap occurs between the Oldham joint and the receiving member, it is structurally difficult to provide a suppressing means or the like to reduce this gap. Therefore, there has been a demand for the use of materials with less wear.

The present invention was created in view of the following requirements,
The object of the present invention is to provide an Oldham joint structure for a scroll compressor that has wear resistance and can prevent the generation of vibration and noise.

[Means for Solving the Problems] In order to achieve the above objects, the present invention provides a fixed scroll fixed to a casing, an orbiting scroll meshing with the fixed scroll to form a closed compression chamber, and a rotating scroll fixed to the casing. an Oldham joint having a protrusion that engages with an adapter and the orbiting scroll, respectively, the scroll configured to discharge a compressed medium at a predetermined pressure while regulating the orbiting movement of the orbiting scroll with the Oldham joint; In the Oldham joint structure of the compressor, the adapter and the orbiting scroll sliding contact portion that come into contact with the protrusion of the Oldham joint are coated with tribaloy, which is mainly composed of cobalt or nickel and contains subcomponents such as molybdenum, chromium, silicon, and carbon. The Oldham joint structure of the scroll compressor includes a receiving member covered with a member having corrosion resistance and wear resistance, and the Oldham joint is made of a stainless steel material. .

[Effect]

By using the specific receiving member that has corrosion resistance and wear resistance, the wear of not only the receiving member but also the protruding part of the Oldham joint on the opposite side is greatly reduced, and the occurrence of play in the sliding contact part is suppressed. , it is possible to prevent the generation of vibration and noise.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Prior to explaining the structure, the characteristics of the member having excellent corrosion resistance and wear resistance will be explained.

This member is called Tribaloy (registered trademark of Cabot Corporation, USA), and is used as a powder for plasma spraying or powder metallurgy, a welding rod for surface hardening, a melting raw material, and a casting raw material.

Therefore, it can be thermally sprayed and fixed onto the surface of a certain member, and it can also be manufactured as a single molded product. Its components are based on cobalt or nickel, molybdenum,
It contains chromium, silicon, carbon, etc. As for properties, it has excellent corrosion resistance and wear resistance. For example, when compared with Stellite, it has been demonstrated that HCL aqueous solution exhibits a value that is three orders of magnitude smaller. In addition, regarding wear resistance, it shows a low coefficient of friction with tool steel, low alloy steel, brass, aluminum alloy, super alloy, graphite, etc.
Carbide or ceramics have the property of significantly reducing wear not only on the carbide itself but also on the opposite side. Tribaloy can also be easily finished using carbide tools, aluminum oxide, silicon carbide, etc. grinding wheels.
No diamond grinding wheel required.

Next, the general structure of a scroll compressor to which this embodiment is applied will be explained with reference to FIG.

A rotating shaft 14 is pivotally supported on the casing 11 via bearings 12 and 13. A crankshaft 15 is provided on the distal end side of the rotating shaft 14, and a boss portion 18 of an orbiting scroll 17 is inserted into the crankshaft 15 via a bearing 16. A spiral wrap 20 extends from the end plate 19 of the orbiting scroll 17 to the boss portion 1
8 and is vertically formed in the opposite direction. Fixed scroll 2
1 is fixed to the casing 11 and its spiral wrap 2
2 meshes with the wrap 20 of the orbiting scroll 17.

A closed compression chamber 23 is formed and compressed medium compressed to a predetermined pressure is discharged to the outside from a discharge port 24. Note that the medium is sucked into the casing 11 through a suction port 25 provided in the middle of the casing 11 and introduced into the compression chamber. Casing 1
An adapter 6 is fixed to 1. The adapter 6 is disposed so as to surround the boss portion 18 by loosely inserting the through hole ]O formed in its center into the hub portion 18.

Next, the Oldham joint 4 is disposed at a position surrounding the boss portion 18, and as shown in FIGS. will be accomplished. The Oldham joint 4 is arranged between the adapter 6 and the orbiting scroll 17, and its projections 5a, 5b
are abutted and engaged with the adapter 6 and the receiving members 3a and 3b of the orbiting scroll 17, which will be described later. As a result, the Oldham joint 4 restricts the orbiting movement of the orbiting scroll 17.

Further, the thrust member 26 of the orbiting scroll 17 is thrust supported by a thrust member 27 fixed to the adapter 6. Although the receiving member 3a on the adapter side with which the projection 5a of the Oldham joint 4 abuts and engages is not clearly shown in FIG. 1, it exists in the direction perpendicular to the plane of the drawing.

Next, the detailed Ml structure of this embodiment will be explained with reference to FIGS. 2 and 3. 2nd E! ! I indicates the engagement state between the adapter 6 and the Oldham joint 4, and the same thing is formed between the orbiting scroll 17 and the Oldham joint 4, but only the former will be explained below.

The adapter 6 is provided with a groove 8 along its radial direction. A pair of receiving members 3a are arranged in the concave groove 8, facing each other along the radial direction, and are connected to the adapter 6 by bolts 9.
It is fixed and placed in the

The protrusion 5a of the Oldham joint 4 is inserted into the gap 7 formed between the pair of opposing receiving members 3a, 3a.

As a result, the protrusion 5a is slidably engaged with the receiving member 5a.

The receiving member 3a is formed of a member 2 made of a stainless steel material that cannot be hardened, and a coating portion 1 made of the aforementioned tribaloy welded to the sliding surface side by plasma spraying or the like. Of course, the entire receiving member 3a may be made of the above-mentioned Tribaloy, but this would increase the cost, and since a coating on the sliding surface is sufficient, the structure described above is adopted in this embodiment.

With the above structure, the protrusion 5 of the protrusion 4 of the Oldham joint 4
a is slidably engaged with the receiving member 3a coated with Tribaloy. As mentioned above, Tribaloy itself has excellent wear resistance and also has the property of suppressing wear on the opposite hand, resulting in a reduction in overall wear. 1. Protrusion 5
There is almost no gap between a and the receiving member 3a. Therefore, the Oldham joint 4 slides smoothly, and generation of vibration, noise, etc. is prevented.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the wear of the Oldham joint and the parts in sliding contact therewith can be greatly reduced, and generation of vibration and noise can be prevented.

[Brief explanation of the drawing]

Fig. 1 is an axial sectional view showing the overall structure of a scroll compressor to which an embodiment of the present invention is applied, Fig. 2 is a plan view showing how the receiving member is attached to the adapter, and Fig. 3 is a plan view of the receiving member. at -1 [IM enlarged sectional view,
Figure 4 is a plan view of the Oldham joint. FIG. 5 is a side view of FIG. 4. DESCRIPTION OF SYMBOLS 1... Coating part, 2... Member, 3a, 3b... Receiving member, 4... Oldham joint, 5a, 5b... Protrusion part, 6... Adapter, 7... Gap, 8...concave groove, 9
... Bolt, 10 ... 6 through holes, 11 ... Casing, 12, 13.16 ... Bearing, 14 ... Rotating shaft,
15... Crankshaft, 17... Orbiting scroll, 1
8... Boss part, 19... End plate, 20. 22... Wrap, 21... Fixed scroll, 23... Sealed compression chamber, 24... Discharge port, 25... Suction hole, 26°27
...Thrust member. Talented fang drawing

Claims (1)

[Claims] It has a fixed scroll fixed to a casing, an orbiting scroll that meshes with the fixed scroll to form a sealed compression chamber, and an Oldham coupling having protrusions that respectively engage an adapter fixed to the casing and the orbiting scroll. In the Oldham joint structure of a scroll compressor configured to discharge compressed medium at a predetermined pressure while regulating the orbiting motion of the orbiting scroll with the Oldham joint, the adapter contacts a protrusion of the Oldham joint; A receiving member made of cobalt or nickel as a basic component and containing subcomponents such as molybdenum, chromium, silicon, and carbon and covered with a material having corrosion resistance and wear resistance is provided in the sliding contact portion of the orbiting scroll, and An Oldham joint structure for a scroll compressor characterized by an Oldham joint made of stainless steel.