CN102094826B - Plane cross coupling of scroll compressor - Google Patents

Abstract

The invention discloses a plane Oldham coupling used for scroll compressors. The main body of work is two pairs of bosses arranged in a cross on the coupling, and the spatial position of the working plane is at the two end planes of the plane Oldham coupling. between. The working planes of the two pairs of bosses of the plane Oldham coupling are perpendicular to each other, and both are located on the outer circle side of the Oldham coupling. The working plane of the first pair of bosses of the plane Oldham coupling is in contact with the friction surface of the pair of bosses of the movable scroll, and at the same time the working plane of the second pair of bosses of the plane Oldham coupling is in contact with the pair of bosses of the fixed scroll. The friction surface of the table fits. The working plane of the boss of the Oldham coupling, the friction surface of the orbiting scroll, and the friction surface of the static scroll are all parallel to the central axis of the Oldham coupling. In this way, the movable scroll is driven by the crankshaft to make a plane circular motion. The invention does not have the traditional protruding guide slider (ie key), and solves the problems of vibration, noise and short life of the existing cross coupling.

Description

A Plane Oldham Coupling for a Scroll Compressor

Technical field:

The invention relates to the field of scroll machinery. In particular, the present invention relates to a unique flat Oldham coupling used in these scroll machines.

Background technique:

Such machines, commonly referred to in the art as "scroll" machines, are used for the transport of various types of fluids. This scroll machine can be made into a scroll expander, a scroll compressor, a scroll engine, a scroll pump and the like. The features of the present invention are suitable for any of these machines. However, for purposes of illustration, the disclosed embodiments are in the form of hermetic refrigerant scroll compressors.

Scroll compressors are increasingly used as compressors in refrigeration and air conditioning applications. Generally, a scroll compressor is mainly composed of an orbiting scroll, a fixed scroll, an Oldham coupling, a bearing seat, a crankshaft, a motor, a sealed casing, and the like. A scroll arrangement in a scroll compressor includes two similarly shaped wraps, each mounted on a separate end plate to define a scroll member. The two scroll members cooperate with each other, wherein the movable scroll rotates 180 degrees relative to the fixed scroll and is installed eccentrically and oppositely. The motor in the scroll compressor drives the crankshaft so that the movable scroll orbits relative to the fixed scroll, thus forming a series of crescent-shaped spaces between the movable scroll and the wraps of the fixed scroll. During the orbiting process of the orbiting scroll, the crescent-shaped space on the outermost edge is constantly moving to the center, while the volume of the crescent-shaped space is also decreasing, so that the gas volume in this space decreases and the pressure increases. Until it communicates with the central exhaust hole, the compressed gas is discharged from the compressor.

The Oldham coupling of the scroll compressor is used to prevent the movable scroll from rotating while satisfying the orbit of the movable scroll around the center of the fixed scroll. The coupling that prevents the orbiting scroll from rotating relative to the non-rotating scroll can take many forms, but generally includes two pairs of keys protruding from the ring. The first pair of keys fits in the groove of the movable scroll, and the second pair of keys fits in the groove of the fixed scroll. Although the Oldham coupling with four keys can effectively prevent the rotating motion of the movable scroll relative to the fixed scroll, many problems may arise in the working process of this Oldham coupling. Due to the existence of these four keys, the Oldham coupling will be subjected to torsional moment during the working process, so that the Oldham coupling will be twisted and deformed, which will reduce the contact area of the key and accelerate the wear of the key surface. As a result, the noise and vibration of the scroll compressor increase, and the service life of the compressor is shortened. At the same time, it is precisely because of the existence of these four keys that the Oldham coupling is prone to repeated collisions between the end plate of the movable scroll and the end plate of the fixed scroll during the working process, causing periodic tilting vibration noise. Not only does this shorten the life of the compressor, it also emits unwanted vibrations and noises constantly.

Invention content:

The object of the present invention is to provide an Oldham coupling that can solve the above problems. The planar Oldham coupling will not be twisted and deformed during operation, and will not be damaged by the end plate of the movable scroll and the fixed scroll. Tilting vibration occurs between the disk end plates.

In order to achieve the above object, the present invention provides a plane Oldham coupling for a scroll compressor, the plane Oldham coupling is a plane ring, and the outer edge of the plane Oldham coupling is arranged symmetrically along the longitudinal direction There are a first boss and a second boss, and the outer edge of the planar Oldham coupling is provided with a third boss and a fourth boss symmetrically along the lateral direction; a first working surface is arranged on the outside of the first boss, and a A second working surface is arranged outside the boss, and the first working surface is parallel to the second working surface; a third working surface is arranged outside the third boss, a fourth working surface is arranged outside the fourth boss, and the third working surface The surface is parallel to the fourth working surface; the top end of the plane Oldham coupling is provided with a first end plane, and the bottom end is provided with a second end plane, and the first end plane and the second end plane are parallel to each other.

The heights of the first working surface, the second working surface, the third working surface and the fourth working surface along the axial direction of the plane Oldham coupling are all equal to the distance between the first end plane and the second end plane.

The scroll compressor includes a scroll, a movable scroll and a fixed scroll; the scroll is arranged between the movable scroll and the fixed scroll.

The movable scroll includes a movable scroll end plate, a fifth boss and a sixth boss, the fifth boss and the sixth boss are arranged on the outer edge of the fixed scroll end plate, the sixth boss and the sixth boss The seven bosses protrude along the direction of the scroll center axis; the fifth boss is provided with the first friction surface of the movable scroll, the sixth boss is provided with the second friction surface of the movable scroll, and the movable scroll The first friction surface and the second friction surface of the movable scroll are parallel to each other.

The fixed scroll includes a fixed scroll end plate, a seventh boss and an eighth boss, the seventh boss and the eighth boss are arranged on the outer edge of the fixed scroll end plate, and the seventh boss and the eighth boss are arranged on the outer edge of the fixed scroll end plate. The eight bosses protrude along the direction of the central axis of the scroll, and the heights of the seventh boss and the eighth boss are equal to the distance between the first end plane and the second end plane; the seventh boss The first friction surface of the fixed scroll is provided, and the second friction surface of the fixed scroll is arranged on the eighth boss.

The first working surface is in contact with the first friction surface of the fixed scroll or the second friction surface of the fixed scroll; the third working surface is in contact with the first friction surface of the fixed scroll or the second friction surface of the fixed scroll. Face to face.

The second working surface is in contact with the first friction surface of the movable scroll or the second friction surface of the movable scroll; the fourth working surface is in contact with the first friction surface of the movable scroll or the second friction surface of the movable scroll Face to face.

The first working surface, the second working surface, the third working surface, the fourth working surface, the first friction surface of the fixed scroll, the second friction surface of the fixed scroll, the first friction surface of the movable scroll or the movable The second friction surface of the scroll disk is covered with a wear-resistant layer.

The heights of the first boss, the second boss, the third boss, the fourth boss, the fifth boss, the sixth boss, the seventh boss and the eighth boss are all equal to the first end plane and the distance between the second end plane.

The invention does not have the traditional protruding guide slider (ie key), and solves the problems of vibration, noise and short life of the existing cross coupling.

The advantages of the present invention are as follows: First, the plane Oldham coupling will not wear the local working surface due to inclination during the working process, and basically eliminates the noise caused by the collision between the Oldham coupling and the moving and static scroll during the working process. Second, the large working area of the planar Oldham coupling is more accurate for the anti-rotation effect of the moving scroll, and reduces the surface contact stress on the working surface of the Oldham coupling, which improves the working condition of the Oldham coupling. In addition, a layer of oxide film is coated on the working surface, which increases the wear resistance of the working surface and prolongs the working life of the scroll compressor.

Description of drawings:

Fig. 1 is a schematic structural view of a plane Oldham coupling of the present invention; wherein Fig. 1a is a front view, and Fig. 1b is a right view;

Fig. 2 is the isometric drawing of plane Oldham coupling of the present invention;

Fig. 3 is the front view of the movable scroll of the present invention;

Fig. 4 is an isometric view of the movable scroll of the present invention;

Fig. 5 is a front view of the fixed scroll of the present invention;

Fig. 6 is an isometric view of the fixed scroll of the present invention;

Fig. 7 is a schematic cross-sectional view of a scroll compressor adopting the plane Oldham coupling of the present invention;

Fig. 8 is an assembly drawing of the plane Oldham coupling, the movable scroll and the fixed scroll of the present invention;

Figure 9 is a cross-sectional view of the assembly shown in Figure 8;

Figure 10 is a top view of the assembly shown in Figure 8;

Figure 11 is a cross-sectional view of the top view of the assembly shown in Figure 8;

FIG. 12 is another cross-sectional view of the top view of the assembly shown in FIG. 8 .

Among them: 1 is the first working surface of the plane cross coupling; 2 is the second working surface of the plane cross coupling; 3 is the third working surface of the plane cross coupling; 4 is the fourth working surface of the plane cross coupling; 5 is the plane of the first end of the plane Oldham coupling; 6 is the plane of the second end of the plane Oldham coupling; 7 is the first friction surface of the movable scroll; 8 is the end plate surface of the movable scroll; 9 is the moving scroll The second friction surface of the scroll; 10 is the first friction surface of the fixed scroll; 11 is the end plate surface of the fixed scroll; 12 is the second friction surface of the fixed scroll; 13 is the movable scroll; 14 is a plane Oldham coupling; 15 is a static scroll; 16 is a bolt; 17 is a bracket; 18 is a bearing; 19 is a crankshaft; 20 is a motor stator; 21 is a motor rotor; 22 is a middle casing; 23 is an oil separator; 24 is the lower casing; 25 is the centrifugal oil tanker; 26 is the upper casing.

Detailed ways:

The present invention is described in further detail below in conjunction with accompanying drawing:

Referring to Figures 1-12, while the principles of the present invention can be applied to many different types of scroll machines, for the sake of illustration, a hermetic scroll compressor is described here.

Referring to the drawings below, in all the drawings, the same reference numerals represent the same components or faces of the components in all the drawings. A schematic cross-sectional view of a scroll compressor including the unique flat Oldham coupling according to the present invention is shown in FIG. 7 and indicated generally at 14 . The scroll compressor includes a compressor middle casing 22, a lower casing 24, an upper casing 26, a bracket 17, and the bracket is fixed in the compressor middle casing 22; the fixed scroll 15 is fixed in the compressor casing; the moving scroll The turntable 13 cooperates with the fixed scroll 15 through the plane Oldham coupling 14, and the movable scroll 13 cooperates with the upper surface of the bracket 17; the crankshaft 19 passes through the bearing 18 installed in the bracket 17 and the movable scroll 13 Cooperate, the circular rotation of crankshaft 19 makes movable scroll 13 do plane circular motion through the effect of plane Oldham coupling 14 like this.

The present invention is directed to the unique flat Oldham coupling 14 depicted in FIGS. 1 and 2 . The present invention relates to the cooperation between the first working surface 1, the second working surface 2, the third working surface 3 and the fourth working surface 4 on the four bosses of the plane Oldham coupling 14, and the fixed scroll end plate surface 11. The first end surface 5 of the plane Oldham coupling and the second end surface 6 of the plane Oldham coupling matched with the end plate surface 8 of the movable scroll.

Referring to Figure 9 and Figure 12, the first working surface 1 of the boss of the plane Oldham coupling and the first friction surface 7 of the boss of the movable scroll are parallel and fit together, and the third working surface of the boss of the plane Oldham coupling 3 and the second friction surface 9 of the movable scroll are parallel and attached, and the second end surface 6 of the planar Oldham coupling is parallel to and attached to the end plate surface 8 of the movable scroll. During the working process, the plane Oldham coupling 14 of the present invention slides back and forth on the two parallel first friction surfaces 7 and second friction surfaces 9 of the movable scroll, and at the same time, the plane Oldham coupling slides on the two parallel first friction surfaces 7 and 9 of the movable scroll. Slide back and forth on the end plate surface 8.

Referring to Figure 9 and Figure 12, the second working surface 2 of the boss of the plane Oldham coupling and the first friction surface 10 of the fixed scroll are parallel and fit together, and the fourth working surface 4 of the boss of the plane Oldham coupling and The second friction surface 12 of the fixed scroll is parallel and attached, and the first end surface 5 of the plane Oldham coupling is parallel to and attached to the end plate surface 11 of the fixed scroll. During the working process, the plane Oldham coupling 14 of the present invention slides back and forth on the two parallel first friction surfaces 10 and second friction surfaces 12 of the fixed scroll. Swipe back and forth across the face.

Referring to Fig. 8, Fig. 9, Fig. 10, Fig. 11 and Fig. 12, the plane Oldham coupling of the present invention is located in the parallel space between the end plate surface 8 of the movable scroll and the end plate surface 11 of the fixed scroll , and the second end surface 6 of the plane Oldham coupling is attached to the end plate surface 8 of the movable scroll, the first end surface 5 of the plane Oldham coupling is attached to the end plate surface 11 of the fixed scroll, and the plane During the movement of the Oldham coupling, the second end surface 6 of the plane Oldham coupling 14 slides on the end plate surface 8 of the movable scroll, and the first end surface 5 of the plane Oldham coupling 14 slides on the surface of the fixed scroll. Slide on the end plate surface 11. Since the two end faces of the plane Oldham coupling slide on the two parallel end plates respectively, when the scroll of the movable scroll 13 is subjected to uneven gas force during the operation of the scroll compressor, The movable scroll 13 has only a tendency to tilt but not tilt. In this way, it is avoided that the planar Oldham coupling collides back and forth between the end plates of the movable and static scroll due to the inclination of the movable scroll during the working process. The first advantage of the present invention is that the plane The noise of the Oldham coupling due to the up and down collision during the working process, and the second is to improve the working condition of the plane Oldham coupling, that is, the plane Oldham coupling will not cause serious wear and tear on the local working surface due to inclination during the working process.

The working areas of the four boss working surfaces (1, 2, 3, 4) of the plane Oldham coupling 14 of the present invention are all greater than the working areas of the keys of the plane Oldham coupling with four keys of the same type, so The large working area can reduce the surface contact stress on the working surface of the boss of the plane Oldham coupling, and secondly, the anti-rotation of the orbiting scroll 13 is more accurate. In addition, the working surface of the boss of the plane Oldham coupling 14 of the present invention is coated with a layer of oxide film, which increases the wear resistance of the working surface of the plane Oldham coupling, thereby prolonging the working life of the scroll compressor.

Although the accompanying drawings have described the embodiments of the present invention, for those skilled in the art, the present invention can be modified, changed and modified without departing from the protection scope of the appended claims and the principle of the present invention, The scope of the invention is defined by the appended claims and their equivalents.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are limited thereto. Under the circumstances, some simple deduction or replacement can also be made, all of which should be regarded as belonging to the scope of patent protection determined by the submitted claims of the present invention.

Claims (5)

1. plane Oldham's coupling that is used for scroll compressor; It is characterized in that: said plane Oldham's coupling is a plane annular spare; This plane Oldham's coupling outer rim longitudinally is symmetrically arranged with first boss and second boss, and this plane Oldham's coupling outer rim is provided with the 3rd boss and the 4th boss along lateral symmetry; In the first boss arranged outside first working surface is arranged, in the second boss arranged outside second working surface is arranged, first working surface is parallel with second working surface; In the 3rd boss arranged outside the 3rd working surface is arranged, in the 4th boss arranged outside the 4th working surface is arranged, the 3rd working surface is parallel with the 4th working surface; Oldham's coupling top, said plane is provided with the first end plane, the bottom is provided with the second end plane, and first end plane and the second end plane are parallel to each other.

2. a kind of according to claim 1 plane Oldham's coupling that is used for scroll compressor is characterized in that: said first working surface, second working surface, the 3rd working surface and the 4th working surface all equal the spacing between first end plane and the second end plane along the axial height of plane Oldham's coupling.

3. a kind of according to claim 1 plane Oldham's coupling that is used for scroll compressor is characterized in that: said scroll compressor comprises scrollwork, moving scroll and fixed scroll; Said scrollwork is arranged between moving scroll and the fixed scroll.

4. like the said a kind of plane Oldham's coupling that is used for scroll compressor of claim 3; It is characterized in that: said fixed scroll comprises fixed scroll end plate, the 7th boss and the 8th boss; The 7th boss and the 8th boss are arranged on fixed scroll end plate outer rim; The 7th boss and the 8th boss platform are along scrollwork central axial direction protrusion, and the height of said the 7th boss and the 8th boss all equals the spacing between first end plane and the second end plane; Said the 7th boss is provided with fixed scroll first rubbing surface, and the 8th boss is provided with fixed scroll second rubbing surface.

5. like the said a kind of plane Oldham's coupling that is used for scroll compressor of claim 4, it is characterized in that: the height of said first boss, second boss, the 3rd boss, the 4th boss, the 7th boss and the 8th boss all equals the spacing between first end plane and the second end plane.

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