JPH0678755B2 - Scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll compressor used in a refrigeration cycle or the like, and more particularly to a system for holding thrust force by balls.

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 a rotation preventing mechanism 6 is fixed to the upper portion thereof. The fixed scroll 4 is composed of an end plate 4a and an wrap 4b having a uniform thickness of an involute standing upright on the end plate 4a or a curve similar to the involute, and is fixed to the block 3 by the end plate 4a. In addition, the orbiting scroll 5 is upright on the end plate 5a and the end plate 5a, and the rack 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 offset by a certain angle.

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 central portion of the shaft 11, and communicates the shaft 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 pressure 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 end of the orbiting scroll 5 which is opposite to the end plate 5a and the receiving plate 16 provided on the block 3. 17 is a retainer, and the balls 15a-1
It has the same number of holes 17a-17x as 5x. And retainer 17
Is a support plate 16 with a fixing pin 18 such as a spring pin.
It is fixed to the block 3 together with it.

Reference numeral 19 is a suction pipe communicating with the suction hole 9, and 20 is a discharge pipe. Further, 21 is the lubricating oil accumulated in the lower part 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 19 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 20 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 Balls 15a-1 which are arranged in between and freely move in the holes 17a-17x of the retainer 17 in synchronization with the orbiting movement of the orbiting scroll 5.
Retained at 5x (eg US Pat. No. 3,600,114
issue).

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above configuration, although the thrust force is reliably retained, a plurality of balls are configured to freely roll in the hole provided in the retainer in order to reduce friction loss. , The total force of the forces acting on the ball acts in the direction of rotating the retainer, and the retainer is subjected to the rotational force. Since this rotational force is supported by the fixed pin, the phenomenon of breakage of the fixed pin may occur.

In order to avoid the above problems, it is conceivable to make the retainer rotatable without fixing it.However, while the retainer also moves in the radial direction during rotation, the retainer performs a chattering motion and abuts and slides on the block. Therefore, there are problems that noise is increased and a wear phenomenon occurs.

The present invention has been made in view of the above points, and reduces the rotational force that acts on the retainer, limits the radial movement of the retainer to enable smooth rotational movement, and wear and breakage phenomena of the thrust force retaining portion. The present invention provides a scroll compressor with high reliability and low noise that eliminates noise and reduces noise.

Means for Solving the Problems In order to solve the above problems, the scroll compressor of the present invention arranges a retainer in response to the orbiting motion of an orbiting scroll so that the retainer is allowed to rotate together with a ball that supports a thrust force. In addition to the above structure, a guide portion for restricting the radial movement of the retainer is provided on the receiving plate, and a minute clearance is provided between the guide portion and the retainer so as to be provided on the bearing sliding portion.

Operation The present invention provides a scroll compressor with high reliability and low noise by eliminating the breakage of the fixing pin for fixing the retainer, the abrasion of the block and the increase of noise caused by the rotation of the retainer, by the above-mentioned configuration.

Embodiment An embodiment of the present invention will be described below with reference to FIGS.
The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

15a to 15x are a plurality of balls that hold the thrust force generated by the compression action, and holes 17a provided in the retainer 17
17x to 17x are arranged so as not to be restricted by the orbiting movement range of the orbiting scroll 5 (the movable distance of the ball is at least twice the orbiting radius).

A receiving plate 16 is fixed to the block 3 between the retainer 17 and the block 3 by a pin or the like, and the receiving plate 16 includes balls 15a to 15x.
It is composed of a flat plate 16a, which is a sliding part of the above, and a guide part 16b which restricts the radial movement of the retainer 17. The retainer 17 is rotatably arranged on the flat plate portion 16a without being fixed, and this kind is provided between the outer circumference (outer diameter dr) of the retainer 17 and the inner circumference (inner diameter dg) of the guide portion 16b. Like the clearance between the shaft and the bearing that smoothly rotates in the compressor bearing, there is a clearance δ of 1/1000 of the outer diameter of the retainer 17 Has been set.

Next, the operation will be described.

When the compression is started, the thrust force acts on the orbiting scroll 5 as described above, and the thrust force acts on the balls 15a to 15x.
Held in. Then, the balls 15a to 15x move in response to the orbiting movement of the orbiting scroll 5 in the holes 17a to 17x of the retainer 17 so that a circle having a diameter twice the orbiting radius becomes a locus. Further, since the balls 15a to 15x contact the wall surfaces of the holes 17a to 17x of the retainer 17, a rotational force acts on the retainer 17, but since the retainer 17 is not fixed to the receiving plate 16, the flat plate portion 16a of the receiving plate 16 is provided. Rotate freely in the circumferential direction above.

Also, the radial motion of the retainer 17 is
Since it is limited by 16b, only minute clearance δ can be made and exercise with less rattling is performed.

Therefore, the rotating force acting on the retainer 17 is not supported by the fixing pin as in the conventional case, and the chattering motion of the retainer 17 without the fixing pin is also eliminated, and the fixing pin is not broken or the block is worn, and it is more reliable than before. Performance is improved and noise is reduced.

Although the retainer guide portion is provided on the outer peripheral side of the receiving plate in this embodiment, it may be provided on the inner peripheral side of the receiving plate, and the receiving plate is fixed on the block. It goes without saying that the effect does not change even if the movement in the radial direction without fixing is made rotatable so as to be equal to the movement amount of the retainer described above.

EFFECTS OF THE INVENTION As described above, according to the present invention, the retainer is arranged so that the ball can support the thrust force in response to the orbiting motion of the orbiting scroll so that the ball can rotate, and the movement of the retainer in the radial direction is controlled. Since the guide part is provided on the receiving plate and a minute clearance is set between the guide part and the retainer so that it is provided in the bearing sliding part, the retainer will be able to perform a smooth rotational movement, such as a pin for fixing the retainer. It is possible to obtain a scroll compressor with high reliability and low noise, in which breakage of the blade and wear phenomenon of the block are eliminated, and noise can be reduced.

[Brief description of drawings]

1 is a vertical sectional view of a scroll compressor showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II 'of FIG. 1, and FIG. 3 is a thrust force holding portion of FIG. FIG. 4 is an enlarged cross-sectional view of the conventional scroll type compressor,
FIG. 5 is a sectional view taken along the line VV ′ in FIG.
FIG. 7 is a sectional view taken along the line VI-VI 'in FIG. 4, and FIG. 7 is an enlarged sectional view of a thrust force retaining portion using a conventional ball and retainer. 3 ... Block, 4 ... Fixed scroll, 4a ... Fixed scroll end plate, 4b ... Fixed scroll wrap, 5 ...
… Orbiting scroll, 5a… Orbiting scroll end plate, 5b…
… Wrap of orbiting scroll, 6… Rotation prevention mechanism, 15a
~ 15x …… Ball, 16 …… Catch plate, 16b …… Guide part, 17…
… Retainer.

Claims (1)

[Claims] Claims: 1. Two orbiting and fixed scrolls having mutually upstanding wraps on an end plate, a block for fixing the fixed scroll, a rotation preventing mechanism for preventing rotation of the orbiting scroll and performing a turning motion, A plurality of balls arranged between the block and the back surface of the orbiting scroll on the side opposite to the wrap side, and a retainer for holding the balls so that the balls do not contact each other and move in synchronization with the orbiting movement of the orbiting scroll. , A retainer plate having a flat plate portion having a sliding distance of the ball or more between the retainer and the block and provided below the ball and above the block. The retainer is arranged so as to be capable of rotating together with the ball in response to the ball, and at least the inner circumference or the outer circumference of the receiving plate is arranged. Write to the guide portion to restrict the radial movement of the retainer is provided, the scroll compressor having a small clearance between said guide portion and the retainer.