JP2000161252A - Movable vortex rotation prevention mechanism for scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movable vortex rotation preventive mechanism capable of preventing the occurrence of the backlash of movable vortex for a scroll type compressor. SOLUTION: As a first race 31 to be fixed to a movable scroll member 5, an item formed out of at least three ball rolling grooves 34 is used, each of which is made out of one ring shaped sheet having balls rolling over it. Meanwhile, as a second race 31 to be fixed to a front housing 2, an item is used, which has a ring plate shaped ball receiving plate 36 capable of receiving the balls, and a ring plate shaped ball behavior regulating plate 38 having at least three ball receiving holes 37 capable of regulating the behavior of the balls.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used for refrigeration and air conditioning, and more particularly, to a movable spiral rotation preventing mechanism.

[0002]

2. Description of the Related Art Several proposals have been made for a movable spiral rotation preventing mechanism used in a scroll compressor. One of them is a first race fixed to a movable spiral and a first race fixed to a fixed portion of a scroll compressor.
There is a ball coupling including a second race axially opposed to the first race and at least three balls interposed between the first and second races to prevent rotation of the first race. Further, as this kind of race, a ring-shaped single plate provided with a recess for forming a ball rolling groove, or a combination structure of a ring-shaped ball receiving plate and a ring-shaped ball behavior regulating plate. Although various types are known, for example, the conventional ball coupling uses the same type as the first and second races (for example, Japanese Patent Application Laid-Open No. 5-33811). , JP-A-9
-42282 and JP-A-8-296656).

[0003]

However, in the conventional ball coupling, when a force for rotating the movable spiral is generated, one ball on the circumference is interposed to prevent the rotation, while the other balls are prevented from rotating. Because it is not restrained, it shows unstable behavior, and the ball position is not stable when it is in a phase that prevents rotation by rotation of the main shaft of the scroll compressor,
A so-called backlash occurs in the movable spiral.

In a structure in which a ball is sandwiched between two races provided with a recess forming a ball rolling groove, the radius of the turning locus of the movable spiral is determined by the dimensional accuracy of each race and cannot be adjusted.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a mechanism for preventing a movable spiral from rotating in a scroll compressor in which backlash of the movable spiral is prevented.

Another object of the present invention is to provide a scroll-type compressor having a movable spiral rotation preventing mechanism capable of adjusting the radius of a turning locus of a movable spiral by selectively using ball receiving plates of several thicknesses. Is to provide.

[0007]

According to the present invention, a first race fixed to a movable spiral of a scroll type compressor and a first race fixed to a fixed portion of the scroll type compressor are provided. One of the axially opposed second races is a ring-shaped race having a recess forming a ball rolling groove having a unique turning locus radius, and the other is a ring-shaped ball receiving plate and a ball receiving plate. There is provided a movable spiral rotation preventing mechanism for a scroll-type compressor, which comprises a ring-shaped ball movement regulating plate having a hole and which holds the ball between these three parts.

Further, according to the present invention, a first race fixed to a movable spiral of a scroll compressor and an axial direction opposed to the first race fixed to a fixed portion of the scroll compressor. A second race, and the first and second races
A scroll-type compressor having at least three balls interposed between the races for preventing rotation of the first race.
One of the races has a recess formed of a single ring-shaped plate and forming at least three ball rolling grooves on which the ball rolls, and the first and second races have The other race has a ring plate-shaped ball receiving plate for receiving the ball, and a ring plate-shaped ball behavior restricting plate having at least three ball receiving holes for restricting the behavior of the ball. And a movable spiral rotation preventing mechanism for the scroll compressor.

[0009] It is preferable that a portion of the ball behavior regulating plate which comes into contact with the ball has a tapered surface.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a description will be given of a scroll type compressor having a movable swirl rotation preventing mechanism according to a first embodiment of the present invention.

This scroll type compressor is used for refrigeration and air conditioning, and has a casing 3 comprising a cup-shaped portion 1 and a front housing 2 having an open end closed. A fixed scroll member 4 and a movable scroll member 5 are arranged inside the cup-shaped portion 1. The fixed scroll member 4 is fixed to the cup-shaped portion 1, and forms a discharge chamber 6 on the back surface in cooperation with the cup-shaped portion 1.
The movable scroll member 5 performs a circular orbital motion without rotating with a predetermined radius in a state where the movable spiral member 5a meshes with the fixed spiral member 4a of the fixed scroll member 4, thereby obtaining a known gas compression action. Then, the compressed gas is discharged to the discharge chamber 6. The rotation of the movable scroll member 5 is prevented by a movable spiral rotation prevention mechanism 7 described later in detail.

The front housing 2 has a cylindrical portion 11. A main shaft 12 is inserted through the inside of the cylindrical portion 11, and is rotatably supported by the front housing 2 by bearings 13 and 14. An eccentric shaft 15 is provided at one end of the main shaft 12 inside the front housing 2. This eccentric shaft 15
Is engaged with the movable scroll member 5 via the eccentric bush 16. Thus, the movable scroll member 5 is driven so as to make a circular orbital motion as the main shaft 12 rotates.

A rotor 22 is rotatably supported outside the cylindrical portion 11 of the front housing 2 via a bearing 21. The rotor 22 is rotationally driven by an automobile engine or the like via a belt. As is well known, the rotational power of the rotor 22 is disengaged from the main shaft 12 by the electromagnetic clutch 23.

Referring to FIGS. 2 and 3 in addition to FIG.
The movable spiral rotation preventing mechanism 7 will be described.

The movable spiral rotation preventing mechanism 7 is called a ball coupling, and includes a first race 31 fixed to the movable scroll member 5 and a front housing 2.
A second race 32 fixed to the first race 31 and opposed to the first race 31 in the axial direction, and the first and second races 31 and 3
And a plurality of, for example, nine (at least three) balls 33 interposed between the two to prevent rotation of the first race 31. The first race 31 is made of a single ring-shaped plate and has a plurality of, for example, nine (at least three
) Of the ball rolling groove 34. The second race 32 has a ring-shaped ball receiving plate 36 having a ring-shaped ball receiving plate 36 for receiving the ball 33 and a plurality of, for example, nine (at least three) ball receiving holes 37 for regulating the behavior of the ball 33. A regulating plate 38. The ball behavior regulating plate 38 has a tapered surface 39 at a portion in contact with the ball 33.

As described above, the first race 31 is a ring-shaped race having a recess 35 forming a ball rolling groove 34 having a unique turning trajectory radius, and the second race 32 is a ring-shaped ball bearing. A plate 36 and a ring-shaped ball movement regulating plate 38 having a ball receiving hole 37 are provided, and the three parts hold the ball 33 therebetween.

The ball rolling groove 34 has a unique turning locus radius. The front housing 2 has a stepped portion extending in the circumferential direction. The ball behavior regulating plate 38 is fixed so as to be in contact with the upper stage of the stepped portion, and the ball receiving plate 36 is assembled in a space between the lower stage and the ball behavior regulating plate 38. The height of the step portion of the front housing 2 is slightly larger than the thickness of the ball receiving plate 36.

During operation of the scroll compressor, the ball 33 rolls on the ball receiving plate 36 while being inscribed in the ball receiving hole 37 of the ball behavior regulating plate 38. The turning radius of the ball 33 at that time can be easily adjusted. That is, several kinds of ball receiving plates having different thicknesses are prepared, and by changing them, the height of the contact point between the ball 33 and the ball behavior regulating plate 38 is changed, so that the turning radius of the ball 33 can be adjusted. . Since the turning radius of the ball 33 can be easily adjusted,
The mutual contact state between the fixed spiral 4a and the movable spiral 5a can be set well, and the productivity and vibration noise can be improved.

Next, referring to FIGS. 4 to 6, the second embodiment of the present invention will be described.
A scroll type compressor provided with a movable swirl rotation preventing mechanism according to the embodiment will be described. Also in this scroll type compressor, the same parts as those in the scroll type compressor shown in FIGS.

In the movable spiral rotation preventing mechanism 7 of the scroll compressor shown in FIGS. 4 to 6, the second race 32
A plurality of, for example, nine (at least three) ball rolling grooves 34 are formed from a single ring-shaped plate, and have a plurality of recesses 35 in which the balls 33 roll. The first race 31 includes a ring-shaped ball receiving plate 36 for receiving the ball 33 and a plurality of, for example, nine (at least 3
) And a ring-shaped ball behavior regulating plate 38 having a ball receiving hole 37. The ball behavior regulating plate 38 has a tapered surface 39 at a portion in contact with the ball 33.

As described above, the second race 32 is a ring-shaped race having a recess 35 forming a ball rolling groove 34 having a unique turning locus radius, and the first race 31 is a ring-plate-shaped ball bearing. A plate 36 and a ring-shaped ball movement regulating plate 38 having a ball receiving hole 37 are provided, and the three parts hold the ball 33 therebetween.

The side plate 5b of the movable scroll member 5 has a step extending in the circumferential direction. The ball behavior regulating plate 38 is fixed so as to be in contact with the upper stage of the stepped portion, and the ball receiving plate 36 is assembled in a space between the lower stage and the ball behavior regulating plate 38. The step amount of the step portion of the movable scroll member 5 is slightly larger than the thickness of the ball receiving plate 36.

During operation of the scroll compressor, the ball 33 rolls on the ball receiving plate 36 while being inscribed in the ball receiving hole 37 of the ball behavior regulating plate 38. The turning radius of the ball 33 at that time can be easily adjusted. That is, several kinds of ball receiving plates having different thicknesses are prepared, and by changing them, the height of the contact point between the ball 33 and the ball behavior regulating plate 38 is changed, so that the turning radius of the ball 33 can be adjusted. . Since the turning radius of the ball 33 can be easily adjusted,
The mutual contact state between the fixed spiral 4a and the movable spiral 5a can be set well, and the productivity and vibration noise can be improved.

[0024]

As described above, according to the movable spiral winding rotation preventing mechanism of the present invention, the use of a race having a ball rolling groove having a unique orbital radius stabilizes the behavior of the ball and reduces the vibration due to backlash and the like. Noise generation can be avoided. Further, since the radius of the turning locus can be adjusted by replacing the ball receiving plate, it is easy to set so that the mutual contact state between the fixed spiral and the movable spiral is maintained well, and therefore, the productivity can be improved. it can. In addition, since the variation in the manufacturing accuracy of the race having the ball rolling groove having the specific orbit radius can be absorbed by replacing the ball receiving plate, the race having the ball rolling groove does not require excessive accuracy.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a scroll compressor having a movable swirl rotation preventing mechanism according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a movable spiral rotation preventing mechanism in the scroll compressor of FIG. 1;

FIG. 3 is an enlarged sectional view of only a main part of a movable spiral rotation prevention mechanism in the scroll compressor of FIG. 1;

FIG. 4 is a vertical cross-sectional view of a scroll compressor having a movable spiral rotation prevention mechanism according to a second embodiment of the present invention.

FIG. 5 is a cross-sectional view of a movable spiral rotation preventing mechanism in the scroll compressor of FIG. 4;

FIG. 6 is an enlarged sectional view of only a main part of a movable spiral rotation prevention mechanism in the scroll compressor of FIG. 4;

[Explanation of symbols]

 2 Front housing 4 Fixed scroll member 5 Movable scroll member 7 Movable spiral rotation prevention mechanism 12 Main shaft 15 Eccentric shaft 16 Eccentric bush 22 Rotor 23 Electromagnetic clutch 31 First race 32 Second race 33 Ball 34 Ball rolling groove 35 Recess 36 Ball receiving plate 37 Ball receiving hole 38 Ball behavior regulating plate 39 Tapered surface

Claims (3)

[Claims] A first race fixed to a movable spiral of a scroll compressor, and a second race fixed to a fixed portion of the scroll compressor and axially opposed to the first race. Among them, one is a ring-shaped race having a recess forming a ball rolling groove having a unique turning locus radius, and the other is a ring-plate-shaped ball bearing having a ring-shaped ball receiving plate and a ball receiving hole. And a plate,
A movable spiral rotation preventing mechanism for a scroll compressor, wherein a ball is held by these three parts. 2. A first race fixed to a movable spiral of a scroll compressor, and a second race fixed to a fixed portion of the scroll compressor and axially opposed to the first race. A scroll-type compressor having at least three balls interposed between the first and second races to prevent the rotation of the first race. One of the two races has a recess formed from a single ring-shaped plate and forming at least three ball rolling grooves on which the ball rolls, and the first and second races The other race has a ring plate-shaped ball receiving plate for receiving the ball, and a ring plate-shaped ball behavior restricting plate having at least three ball receiving holes for restricting the behavior of the ball. Features scrow Rotary spiral rotation prevention mechanism of a rotary compressor. 3. The mechanism according to claim 1, wherein a portion of said ball behavior restricting plate which is in contact with said ball has a tapered surface.