JP2563424B2 - Scroll compressor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used in a refrigeration cycle or the like, and more particularly to a scroll compressor that retains thrust force with balls.

2. Description of the Related Art A conventional configuration will be described with reference to FIGS. 8 to 11.

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 involute standing upright on the end plate 4a or a wrap 4b having a uniform thickness of a curved line similar to the involute.
It is fixed to block 3 at 4a. The orbiting scroll 5 is composed of an end plate 5a and a wrap 5b which is upright on the end plate 5a and has the same curve as the wrap 4b of the fixed scroll 4. The end plate 5a is provided with a clearance A between the end plate 4a of the fixed scroll 4 and the block 3. It is sandwiched and supported, and is restrained by the rotation preventing mechanism 6. The fixed scroll 4 and the orbiting scroll 5 are the winding end 4 of each wrap 4b, 5b.
The b ′ and 5b ′ are fitted together with a certain angle shift.

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 supported by the block 3 via a thrust bearing 12, and is a boss portion 11 provided at an end of the machine body 7 and eccentric from the shaft center.
By housing the protrusion 10 of the orbiting scroll 5 in a, the electric motor unit 2 and the orbiting scroll 5 are connected. Further, an oil supply hole 11b penetrates through the central portion 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 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.
It communicates with the low pressure part from the clearance A of the parts 5a and 4a. 1
5a to 15x are on the non-lap side of the end plate 5a of the orbiting scroll 5,
Balls placed between blocks 3, 16 balls 15
It is a retainer with a thickness slightly smaller than the diameter of a ~ 15x,
The balls 15a to 15x are the balls 15a opened in the retainer 16.
Roll freely in the same number of holes 16a-16x as ~ 15x. Reference numeral 17 denotes a cushioning material, which has a discontinuous portion 17a in a part thereof and is wound around the outer periphery of the retainer 16 to prevent direct contact between the block 3 and the outer periphery of the retainer 16.

Reference numeral 18 is a suction pipe communicating with the suction hole 9, and 19 is a discharge pipe.
Further, 20 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 due to the rotation of the electric motor unit 2 is transmitted to the orbiting scroll 5 via the boss portion 11a and the protruding portion 10, but the orbiting scroll 5 does not rotate by the action of the rotation preventing mechanism 6 and does not rotate. A turning motion is performed with the center of the involute of 4 as the turning 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 18 through the suction hole 9 is once discharged into the closed casing 1 through the compressed discharge hole 8 and then through the discharge pipe 19. It is discharged 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 introduced into the back pressure chamber 14 on the back surface of the orbiting scroll 5 through the clearance A, and most of the thrust force is applied to the end plate 5a of the orbiting scroll 5,
The balls 15a to 15x arranged between the blocks 3 and freely rolling in the holes 16a to 16x of the retainer 16 were held in synchronization with the orbiting movement of the orbiting scroll 5.

Problems to be Solved by the Invention In the conventional configuration as described above, the retainer 16 floats up during operation and comes into contact with the orbiting scroll end plate 5a, or the cushioning material 17 is used.
However, there is a problem in that it is pulled out from the outer periphery of the retainer 16 and is caught between the outer periphery of the orbiting scroll end plate 5a and the block 3 to be locked.

The present invention solves the above-mentioned conventional drawbacks and prevents the retainer from rising and the cushioning material from coming off.

Means for Solving the Problems According to the present invention, a retainer is arranged in a block, a cushioning material is wound around the retainer, and a C ring housed in the groove of the block is arranged between the orbiting scroll end plate and the retainer. The inner diameter of the ring is smaller than the outer diameter of the retainer.

Effect The present invention has the above-described configuration to limit the axial movement of both the retainer and the cushioning material with the C ring, so that the retainer is not lifted up and contact between the retainer and the orbiting scroll is eliminated, and the cushioning material serves as the retainer. It will not come out upward, and the cushioning material will not lock between the orbiting scroll and the block, improving reliability.

EXAMPLES An example of the present invention will be described below with reference to FIGS. 1 to 7.

Incidentally, the same parts as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted.

Reference numeral 21 denotes a block, a retainer 22 is arranged in the block, and a cushioning material 23 is wound around the retainer 22. A groove 21a is provided in the block 21 below the orbiting scroll end plate 5a, and a C ring 24 is housed in the groove 21a.
The inner diameter of the C ring 24 when housed in is smaller than the outer diameter of the retainer 22. Thin parts on both ends of C-ring 24
24a and a step portion 24b are formed, and one thin portion 24a is housed in the other step portion 24b while the C ring 24 is housed in the groove 21a.

In the above structure, the retainer 22 and the cushioning material 23 are C rings.
The axial movement of the retainer 22 is restricted by 24, and the retainer 22 is prevented from rising so that the contact portion between the ball 15 and the retainer 22 becomes a ball.
While passing through the center of 15 and in the plane parallel to the end plate 5a,
The cushioning member 23 is prevented from coming off above the retainer 22 and the cushioning member 23 is not locked between the orbiting scroll end plate 5a and the block 21, so that the reliability is improved.

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, a rotation of the orbiting scroll, and a turning motion. A rotation preventing mechanism, a plurality of balls arranged between the block and the back side of the orbiting scroll on the opposite wrap side, a retainer having a hole for accommodating the balls, and a cushioning material arranged between the retainer outer periphery and the block. In addition, a C ring having an inner diameter smaller than the outer diameter of the retainer is provided between the rear surface of the orbiting scroll on the side opposite to the wrap side and the retainer, and the C ring is housed in the groove formed in the block. Restricts the movement of both the retainer and the cushioning material so that the retainer does not rise and the retainer and the swing The contact between the crawl disappears and the contact area between the ball and retainer is in the plane that passes through the center of the ball and is parallel to the end plate, and the cushioning material does not come out above the retainer and the cushioning material locks between the orbiting scroll end plate and the block. Reliability is improved.

[Brief description of drawings]

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 line II-II 'of FIG. 1, and FIG. 3 is a thrust ball bearing portion of FIG. FIG. 4 is an enlarged sectional view of FIG. 4, FIG. 4 is a C-ring diagram in a contracted state before being assembled, FIG. 5 is a sectional view taken along line VV ′ in FIG. 4, and FIG. 6 is a C-ring diagram in an assembled state. 7 is a sectional view taken along line VII-VII 'in FIG. 6, FIG. 8 is a longitudinal sectional view of a conventional scroll compressor, and FIG. 9 is a sectional view taken along line IX-IX' in FIG. Ten
8 is a sectional view taken along the line XX 'in FIG. 8, and FIG.
It is an expanded sectional view of the thrust ball bearing part of the figure. 4 ... Fixed scroll, 5 ... Orbiting scroll, 6 ...
Anti-rotation mechanism, 15a ~ 15m ~ 15x ... ball, 21 ... block, 21a ... groove, 22 ... retainer, 23 ... cushioning material, 24
…… C ring, 24a …… Thin wall part, 24b …… Step part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A 61-241479 (JP, A) JP-A 64-377 (JP, A)

Claims (1)

(57) [Claims] 1. An orbiting scroll and a fixed scroll which have an upright wrap on an end plate and 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 block on the non-wrap side of the orbiting scroll and the block, a retainer having holes for accommodating the balls, a cushioning material arranged between the outer periphery of the retainer and the block, and an anti-wrap for the orbiting scroll. A scroll-type compressor comprising a C-ring having an inner diameter smaller than the outer diameter of the retainer between the side rear surface and the retainer, and the C-ring being housed in a groove formed in the block.