JPH0692794B2 - Scroll type compressor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compressor used in a refrigeration cycle or the like, and more particularly to improving reliability in a system in which a ball holds thrust force.

2. Description of the Related Art A conventional configuration will be described with reference to FIGS.

Reference numeral 1 is a closed casing, 2 is an electric motor portion, and a machine portion main body 7 including a block 3, a fixed scroll 4, an orbiting scroll 5, and an automatic prevention mechanism 6 is fixed to the upper portion thereof. The fixed scroll 4 is constituted by an end plate 4a and an wrap 4b having a uniform thickness of an involute or an involute-like curve which stands upright on the end plate 4a, and is fixed to the block 3 by the end plate 4a. The orbiting scroll 5 is upright on the end plate 5a and the end plate 5a, and the wrap 4b of the fixed scroll 4 is provided.
Consists of a wrap 5b having the same curve as the end plate 5a,
A clearance A is provided between the end plate 4a of the fixed scroll 4 and the block 3 so as to be sandwiched and supported, and is restrained by a rotation preventing mechanism 6 called an Oldham mechanism. And, the fixed scroll 4 and the orbiting scroll 5 are each wrapped.
The winding end ends 4b 'and 5b' of 4b and 5b are fitted together with a certain angle offset.

8 is a discharge hole, and 9 is a suction hole. The discharge hole 8 is provided at the center of the involute of the fixed scroll 4, and the suction hole 9 is provided at the outer edge of the end plate 4a of the involute of the fixed scroll 4. Reference numeral 10 denotes a protrusion provided on the surface of the orbiting scroll 5 opposite to the wrap 5b, which is concentric with the center of the involute of the wrap 5b. Reference numeral 11 denotes a shaft that is supported by the block 3 via a thrust bearing 12, and is a machine body 7
11a eccentric from the shaft center provided at the end of the
The orbiting scroll 5 is connected by housing the protrusion 10 of the orbiting scroll 5 therein. Further, an oil supply hole 11b penetrates through the center of the shaft 11, and communicates the oil reservoir space 13 formed by the boss portion 11a of the shaft 11 and the protrusion 10 of the orbiting scroll 5 with the lower portion of the closed casing 1. . Reference numeral 14 denotes a back chamber formed on the back surface of the orbiting scroll 5, and the wrap 5b side of the orbiting scroll 5 is an end plate 5
It communicates with the low pressure part from the clearance A of parts a and 4a. 15
Reference numerals a to 15x denote a plurality of balls arranged between the block 3 and the side opposite to the end plate 5a of the orbiting scroll 5. A retainer 16 has holes 16a to 16x in the same number as the balls 15a to 15x. The retainer 16 is fixed to the block 3 with, for example, a spring pin or the like, and is freely movable on the block 3 without being fixed.

Reference numeral 17 is a suction pipe communicating with the suction hole 9, and 18 is a discharge pipe. Further, 19 is a lubricating oil accumulated in the lower portion of the closed casing 1.

Next, the compression mechanism of the scroll compressor will be described. The rotational movement of the shaft 11 accompanying the rotation of the electric motor unit 2 is
Although transmitted to the orbiting scroll 5 via the protrusion 11a and the protrusion 10, the orbiting scroll 5 does not rotate by the action of the rotation preventing mechanism 6 but makes an orbit around the center of the involute of the fixed scroll 4 as the orbiting center. At this time, the winding end 5b 'of the wrap 5b of the orbiting scroll 5 is in contact with the wrap 4b of the fixed scroll 4, and the winding end 4b' of the wrap 4b of the fixed scroll 4 is in contact with the wrap 5b of the orbiting scroll 5. Is completed, and the pressure of the compression space S increases as the two contact points between the wraps 4b and 5b approach the center of the involute along with the revolution movement of the orbiting scroll 5.

By the compression mechanism of this scroll compressor, the refrigerant sucked from the suction pipe 17 through the suction hole 9 is compressed and once discharged through the discharge hole 8 into the closed casing 1, and then the discharge pipe.
It is discharged via 18 to a cooling system (not shown). At this time, as the pressure in the compression space S increases, a thrust force that tends to separate the fixed scroll 4 and the orbiting scroll 5 in the axial direction is generated. Conventionally, this thrust force is partially retained by the low-pressure pressure introduced into the back pressure chamber 14 on the back surface of the orbiting scroll 5 via the clearance A, and most of the thrust force is retained on the end plate 5a of the orbiting scroll 5 and the block 3 It is arranged between the holes 16a to 16x freely moving in the holes 16a to 16x of the retainer 16 in synchronization with the orbiting movement of the orbiting scroll 5.
15a to 15x whose movement is restricted by the end faces 16a 'to 16x'
It was held in.

Problems to be Solved by the Invention In such a conventional configuration, although the thrust force is retained, the ball contacts the end surface of the retainer hole at one point, and the contact point between the ball and the retainer is the axial center of the ball. However, since the thrust force component acting on the ball is exerted on the end surface of the retainer because it is far away, there is a problem that the end surface of the retainer is worn or the ball is worn.

The present invention solves the above-mentioned drawbacks of the prior art, and prevents the wear by dispersing the force applied to one point by providing two or more contact portions between the ball and the retainer.

Means for Solving the Problems In the present invention, the contact portion between the retainer and the ball is two or more points which are substantially plane-symmetric with respect to a plane parallel to the end plate of the orbiting scroll and passing through the center of the ball.

Operation According to the present invention having the above-described structure, the contact force between the retainer and the ball is two or more, so that the contact force is dispersed and wear of the retainer and the ball can be prevented.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1, 2, and 3. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. 20 is a retainer, and holes 20a-2
It has 0x. In addition, the balls are placed in the holes 20a to 20x of the retainer 20.
15a to 15x are housed, and the contact portions 20a 'to 20x' between the balls 15a to 15x and the retainer holes 20a to 20x are substantially symmetric with respect to a plane parallel to the end plate 5a of the orbiting scroll and passing through the center of the ball. Retainer 20 is installed so that there are two or more points. The retainer rotates in the circumferential direction, and the retainer holes 20a to 20x are opened so that the balls 15a to 15x can roll to some extent.

In the above configuration, when a thrust force that tends to separate in the thrust direction is generated between the fixed scroll 4 and the orbiting scroll 5 as the pressure in the compression space S increases, most of the thrust force is retained by the balls 15a to 15x. Further, in accordance with the orbiting movement of the orbiting scroll 5, the balls roll in the retainer holes 20a to 20x as in the conventional case, but the contact portions 20a 'to 20x' of the balls 15a to 15x and the retainer holes 20a to 20x are orbiting scrolls. The contact load is dispersed and the reliability is improved because the two points are parallel to the end plate and substantially in the plane symmetric position with respect to the plane, passing through substantially the centers of the balls 15a to 15x.

Further, FIG. 4 shows the holes 21a to 21x of the retainer 21 and the balls 15a to 1x.
This is the case where the contact portions 21a 'to 21x' of 5x are two points which are parallel to the end plate 5a of the orbiting scroll and are not completely symmetrical with respect to the plane passing through the centers of the balls 15a to 15x. There are two points and the contact load is dispersed, so wear is reduced,
Improves reliability.

In any of the embodiments, the hole diameter of the retainer is made close to twice the turning radius so as to increase the rolling distance of the ball in the radial direction, and if the retainer is rotated, the contact area between the ball and the turning scroll or block is increased. Needless to say, it spreads and improves reliability.

Further, the contact portion between the ball and the retainer fluctuates during one revolution of the orbiting scroll, and for example, at least one of the ball and the section contacting in the vicinity of the plane parallel to the end plate of the orbiting scroll and passing through the center of the ball during one revolution. It suffices that the ball and the retainer make one contact with each other at a substantially plane symmetrical position with respect to the plane during rotation.

EFFECTS OF THE INVENTION As is apparent from the above description, according to the present invention, two orbiting scrolls and fixed scrolls having a wrap that stands upright on an end plate are engaged with each other, a block for fixing the fixed scrolls, and a rotation of the orbiting scroll to prevent rotation. It is equipped with a rotation-preventing mechanism that performs movement, a plurality of balls arranged between the block on the opposite side of the orbiting scroll and the block, and a retainer having a hole for accommodating the balls. The contact point between the ball and the retainer hole is the orbiting scroll. Are placed so that they are at least two points that are substantially plane-symmetric with respect to a plane that is parallel to the end plate and that passes through the center of the ball. By setting the contact points of the retainer and the ball to two or more points, the retainer and the ball are worn. Has the effect of being able to prevent

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a scroll type compressor showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line VV 'in FIG. 1, and FIG. 3 is a perspective view of the thrust holding portion in FIG. FIG. 4 is an enlarged sectional view, FIG. 4 is an enlarged sectional view of a thrust holding portion showing another embodiment of the present invention, FIG. 5 is a longitudinal sectional view of a conventional scroll compressor, and FIG. 6 is VI- of FIG. View from line VI ', No. 7
FIG. 8 is a transverse sectional view taken along the line VII-VII 'of FIG. 5, and FIG. 8 is an enlarged sectional view of a conventional thrust holding portion. 3 ... Block, 4 ... Fixed scroll, 5 ... Orbiting scroll, 6 ... Rotation prevention mechanism, 15a-15m-15x ... Ball, 20,21 ... Retainer, 20a-20m-20x ... Hole, 21a
~ 21m ~ 21x ... hole, 20a '~ 20m' ~ 20x ', 21a' ~ 21m '
~ 21x '…… Ball and retainer contact area.

Claims (1)

[Claims] 1. An orbiting scroll and a fixed scroll, which have wraps upright on an end plate, are engaged with each other, a block for fixing the fixed scroll, and a rotation preventing mechanism for preventing the orbiting scroll from rotating and performing a turning motion. A plurality of balls arranged between the back surface of the orbiting scroll on the side opposite to the wrap side and a retainer having a hole for accommodating the ball are provided, and a contact point between the ball and the hole of the retainer is on an end plate of the orbiting scroll. A scroll-type compressor having two or more points that are parallel to each other and are substantially plane-symmetric with respect to a plane passing through the center of the ball.