JPS63162985A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent abrasion by providing a passage communicating a hole storing balls of a retainer and the inner periphery or the outer periphery of the retainer on a member arranged near the retainer or the hole. CONSTITUTION:A retainer 20 is provided between a block 3 and the back face of the end plate 5a of a rotary scroll 5, and notches 21a-21y formed from the inner periphery to the outer periphery are provided on the upper end lower end faces. Balls 15a-15x perform circular motion in holes 20a-20x in response to the rotating motion. Lubricating oil 19 flows into a back pressure chamber 14 and passes the notches and lubricates the balls 15a-15x. Accordingly, lubricating oil is fed to sliding sections of the balls, and abrasion is dissolved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a scroll compressor used in a refrigeration cycle or the like, and particularly relates to a system in which thrust force is maintained by balls.

Conventional technology A conventional configuration will be explained with reference to FIGS. 6 to 8.

1 is a sealed casing, 2 is an electric motor section, and on top of it are a block 3', a fixed scroll 4. Orbital scroll 6
, a mechanical part main body 7 constituted by an anti-rotation mechanism 6 is fixed. The fixed scroll 4 includes an end plate 4a and an end plate 4a.
consisting of a wrap 4b having a uniform thickness of an upright involute or a curve similar to an involute,
It is fixed to the block 3 with a mirror plate 4a. The orbiting scroll 6 is composed of an end plate 6a and a wrap 5b that stands upright on the end plate 5a and has the same curve as the wrap 4b of the fixed scroll 4, and the end plate 6a
and a block 3 with a clearance A provided therebetween and supported, and restrained by an anti-rotation mechanism 6 called an Oldham mechanism.

The fixed scroll 4 and the orbiting scroll 6 are aligned with each ramp 4b, tsbO winding end 4b', sb' shifted 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. 10 is a protrusion provided on the surface of the orbiting scroll 6 opposite to the wrap 5b, and is concentric with the center of the involute of the rough pro b. 11 is a shaft supported by the block 3 via a thrust bearing 12;
The electric motor section 2 and the orbiting scroll 5 are connected by housing the protrusion 1o of the orbiting scroll 6 in a boss section 11a provided at the end of the mechanical section main body 7 and eccentric from the center of the shaft. Further, an oil supply hole 11b passes 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 6 with the lower part of the sealed casing 1. . Reference numeral 14 denotes a back pressure chamber formed on the back surface of the orbiting scroll 6, and the wrap 5b side of the orbiting scroll 5 communicates with a lower pressure section than the clearance A between the end plates 5a and 4a.

Reference numerals 15a to 15x denote a plurality of balls arranged between the mirror of the orbiting scroll 5, the opposite wrap side of the plate 6a, and the block 3. Reference numeral 16 denotes a flat retainer having a thickness equal to or greater than % of the diameter of the balls 15a to 15]C;
-15x and the same number of holes 16a to 16x are provided. -The retainer 16 is sandwiched between the block 3 and the back surface of the end plate 6a of the orbiting scroll 6 with a clearance B.

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

Next, the compression mechanism of the scroll compressor will be explained. The rotational movement of the shaft 110 accompanying the rotation of the electric motor section 20 is transmitted to the orbiting scroll 5 via the boss section 11a and the protrusion section 1o, but due to the action of the rotation prevention mechanism 60, the orbiting scroll 5 does not rotate on its own axis and is rotated by the involute of the fixed scroll 4. It rotates around the center of . At this time,
Suction is complete when the end sb' of the wrap 5b of the orbiting scroll 6 is in contact with the wrap 4b of the fixed scroll 4, and the end 4b' of the wrap 4b of the fixed scroll 4 is in contact with the wrap 5b of the orbiting scroll 5. , and as the orbiting scroll 6 revolves, the wrap 4b and the wrap 6b
As the two contact points approach the center of the involute, the pressure in the compression space S increases.

By the compression mechanism of this scroll compressor, the refrigerant sucked from the suction pipe 17 through the suction hole 9 is compressed and the refrigerant is compressed through the discharge hole 8.
After being once discharged into the closed casing 1 via the discharge pipe 18, it is discharged to a cooling system (not shown). At this time, as the pressure in the compression space S increases, a thrust force is generated between the fixed scroll 4 and the orbiting scroll 6 that tends to separate them in the axial direction. Conventionally, this thrust force is
The back of the orbiting scroll 6 has a clearance of 8 to the pressure chamber 14.
A part of the pressure is retained by the low pressure introduced through the scroll, and most of it is connected to the end plate 6a of the orbiting scroll 6.
It is held by balls 15a to 15K which are disposed between blocks 3 and move freely within holes 16a to 16x of retainer 16 in synchronization with the orbiting movement of orbiting scroll 6 (for example, U.S. Pat. No. 3,600,114). , the retainer 16 responds to the orbiting movement of the orbiting scroll 6 to rotate the balls 16a to 16.
x, and the balls 15a to 15I were not sliding locally on the block 3, but were moving around the entire circumference.

Problems to be Solved by the Invention However, in the above configuration, the retainer is not fixed and is sandwiched between the back surface of the end plate of the block orbiting scroll with a clearance B, and therefore the retainer can rotate without vibration. The ball maintains thrust force while rotating with the retainer, but the retainer must have a clearance B between the block orbiting scroll end plate and the back surface of the block to ensure that the ball has a thickness of at least % of the ball's diameter due to the lifespan of the ball and retainer. Because the balls are sandwiched between them, it is difficult for the lubricating oil lifted into the back pressure chamber to flow into the holes provided in the retainer, which causes wear on the walls and blocks of the retainer holes that the balls come into contact with, and on the back of the orbiting scroll end plate. was occurring.

The present invention has been made in view of the above points, and provides a scroll compressor with high reliability and high efficiency by supplying lubricating oil to the portion in contact with the balls and eliminating the wear phenomenon.

Means for Solving the Problems In order to solve the above problems, the scroll compressor of the present invention has a structure in which a passage is provided that communicates the hole provided in the retainer for accommodating the ball with the inner or outer periphery of the retainer. It is something to do.

Operation The present invention eliminates the abrasion phenomenon of the wall surface of the retainer hole that comes into contact with the balls, the block, the back surface of the orbiting scroll end plate, etc., and obtains a highly reliable and highly efficient compressor.

Example An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

It should be noted that the same parts as in the conventional example are given the same reference numerals and explanations will be omitted.

2o is a retainer that is not fixed but is sandwiched between the block 3 and the back surface of the end plate 6a of the orbiting scroll 5 with a clearance B.

Further, the upper and lower end surfaces of the retainer 20 have notches 21a to 21y extending from the inner circumference to the outer circumference of the retainer, and each notch 21n has holes 20a to 20! The notches 21a to 21y are provided alternately in the upper and lower portions over the entire circumference of the retainer 20.

Next, we will discuss the operation.

When compression starts, a thrust force acts on the orbiting scroll 5 as described above, and this thrust force is applied to the balls 15a to 15a.
It is held at 15x. The balls 16a to 15 move circularly within the holes 20a to 20X of the retainer 20 in response to the orbiting movement of the orbiting scroll 5, and the retainer 20 receives rotational force from the balls 15a to 15x to cause the balls to move on the block 3. 15a-16! It also performs rotational motion.

On the other hand, when compression starts, the lubricating oil 19 accumulated at the bottom of the sealed casing 1 is supplied to the center of the shaft 11 by the differential pressure.
It flows into the back pressure chamber 14 through b.

And notches 21 &~21y provided in the retainer 20
Through holes 20a-20! and the balls 15a to 16
After lubricating the X sliding part, it flows into the compression space S through the clearance A.

Therefore, the retainer 20 performs smooth rotational movement without vibration between the block 3 and the rear surface of the end plate 6b of the orbiting scroll 6 as in the conventional case, and prevents abnormal noise from occurring.
The wear phenomenon of the sliding parts is eliminated, and the balls 15a~
Since lubricating oil is reliably supplied to the sliding parts of ball 15x, the wear phenomenon of the sliding parts of balls 15a to 15X is eliminated compared to the conventional one, and the reliability of the compressor is improved.

In this embodiment, the notch includes a plurality of holes for storing balls provided in the retainer. It goes without saying that a hole communicating with the periphery or the outer periphery may be used.

Further, in this embodiment, the passage is provided in the retainer, but it goes without saying that the same effect can be obtained by providing the passage in a member disposed near the hole provided in the retainer for storing the balls, such as a block or an orbiting scroll head plate. .

Furthermore, although the retainer was rotated in this embodiment, the effect remains the same even if the retainer is fixed.

Effects of the Invention As described above, the present invention provides a passage that communicates the hole provided in the retainer for accommodating the ball with the inner periphery or outer periphery of the retainer, in the retainer or in a member disposed near the hole. Therefore, lubricating oil is reliably supplied to the sliding parts of the balls, and wear of the balls and the retainers, blocks, orbiting scrolls, etc. that come into contact with the balls is eliminated, and a highly reliable scroll compressor can be obtained.

[Brief explanation of the drawing]

FIG. 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 nu' in FIG. 1, and FIG. 3 is a 1-1' in FIG. 2. Figure 4 is a cross-sectional view of the main part taken along line ■-Nl in Figure 2, Figure 5 is a vertical cross-sectional view of a conventional scroll compressor, and Figure 6 is a cross-sectional view of the conventional scroll compressor. FIG. 7 is a cross-sectional view taken along the line ■-■' in FIG. 6, and FIG. 8 is a cross-sectional view of essential parts of a conventional scroll compressor. 3...Block, 4...Fixed scroll, 4a...Fixed scroll end plate, 4b...
... Fixed scroll wrap, 5... Orbiting scroll, 6a... Orbiting scroll end plate,
5b... Wrap of orbiting scroll, 6...
... Rotation prevention mechanism, 15a-16x... Pole, 20... Retainer, 20a-20 x...
...hole, 21a-21y...notch. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 υ 3. lJ Figure 4 Figure 7 Figure 8

Claims (1)

[Claims] (1) Two mutually interlocking orbiting and fixed scrolls having wraps standing upright on the end plate, a block for fixing the fixed scroll, an anti-rotation mechanism for preventing the rotation of the orbiting scroll and causing the orbiting movement, and the orbiting scroll. a plurality of balls arranged between the rear surface on the opposite side of the end plate and the block, and a retainer that holds the balls so that the balls do not contact each other and move in synchronization with the orbiting movement of the orbiting scroll. A scroll compressor comprising: a passage provided in the retainer that communicates a hole for accommodating the ball with an inner circumference or an outer circumference of the retainer.