JPH01376A - Scroll compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 The conventional configuration will be explained with reference to FIGS. 4 and 6.

1 is a sealed casing, 2 is an electric motor section, and the upper part includes a block 3, a fixed scroll 4, an orbiting scroll 6,
A mechanical part main body 7 constituted by an anti-rotation mechanism 6 is fixed. The fixed scroll 4 is composed of an end plate 4a and a wrap 4b having a thickness like an involute or a curve similar to an involute standing upright on the end plate 4a, and is fixed to the block 3 by the end plate 4a. Moreover, the orbiting scroll 5 is constructed of a lube 5b that stands upright on an end plate 5a and an end plate 6a, and has the same curve as the wrap 4b of the fixed scroll 4, and the end plate 6a has a clearance A between the end plate 4a of the fixed scroll 4 and the block 3. The rotation prevention mechanism 6 is provided and supported by being sandwiched, and is restrained by an anti-rotation mechanism 6 called an Oldham mechanism. Then, the winding ends of the fixed scroll 4 and the five orbiting scrolls 4b and 6b, *
b' and sb' are combined with a certain angle shifted.

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 6b, and is concentric with the center of the involute of the last 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 6 are connected by housing the protrusion 10 of the orbiting scroll 5 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 shunt 11 and the protrusion 1o of the orbiting scroll 5 with the lower part of the Tomohime casing 1. There is. Reference numeral 14 denotes a back pressure chamber formed on the back surface of the orbiting scroll 5, and the wrap 6b side of the orbiting scroll 5 communicates with the low pressure section through the clearance A of the end plates 5a and 4a.

15a~15! are a plurality of balls arranged between the block 3 and the opposite wrap side of the end plate 5a of the orbiting scroll 5. Reference numeral 16 denotes a retainer made of iron-based or plastic-based material, and has the same number of holes 18 as the poles 16a to 15x.
It is equipped with a to 16x.

17 is a suction pipe communicating with the suction hole 9, and 18 is a discharge pipe.

Next, the compression mechanism of the scroll compressor will be explained. The rotational movement of the shaft 11 accompanying the rotation of the electric motor section 2 is transmitted to the orbiting scroll 6 via the boss section 11a1 and the protruding section 1o. However, due to the action of the rotation prevention mechanism 6, the orbiting scroll 5 does not rotate on its own axis and moves toward the fixed scroll 4. The center of the involute is the center of rotation. At this time, the 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 end 4b' of the wrap 4b of the fixed scroll 4 is in contact with the wrap 5bK of the orbiting scroll 5. The state is that suction is complete, and as the orbiting scroll 6 revolves, the wraps 4b and 5b
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 discharged into the -H sealed casing 1 through the λ discharge hole 8, and then through the discharge pipe 18. and discharged into 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 5 that tends to separate them in the axial direction. Conventionally, this thrust force is partially held 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 it is applied to the end plate 5a of the orbiting scroll 5 and the block 3. They are held by balls 15a-15x which are disposed between them and move freely within holes 16a-18x of retainer 16 in synchronization with the turning movement of rotating roll 6 (for example, U.S. Pat. No. 3,600,114).

Problems to be Solved by the Invention However, in the above structure, the balls are configured to freely roll around the large circle of the retainer, so if the retainer is made of iron-based material, the weight of the retainer is heavy. Therefore, there was a problem in that the noise in the circumferential direction of the retainer was large, especially at high speeds.

In addition, if the retainer is made of a plastic material with a small coefficient of restitution, the noise caused by the contact between the pole and the retainer will be low, but the strength of the plastic material is low, so if it is thin, it may break or cause problems in reliability. There was a problem with this.

The present invention solves the above problems by forming the hole part of the retainer that contacts the pole and the rest of the retainer with different materials, thereby improving the wear resistance of the retainer or reducing noise. The purpose is to

Means for Solving the Problems The present invention consists of 1. A retainer is installed in which the hole in the retainer that contacts the balls and the retainer body other than the hole are made of different materials, and the hole is made of iron-based material and the retainer body other than the hole is made of plastic-based material. Alternatively, the hole may be made of a plastic material and the retainer body other than the hole may be made of an iron material.

Function The present invention has the above-described structure, but when the hole is made of iron-based material and the retainer body is made of plastic-based material,
The strength of the hole is high, so there is almost no wear, and the low specific gravity of the plastic allows smooth movement of the retainer in the circumferential direction.The contact force between the ball and the hole is small, reducing wear. If the retainer body is made of a plastic material and the retainer body is made of an iron material, the noise caused by the contact between the balls and the hole can be reduced because the coefficient of restitution of the plastic is small, and the plastic material with a low specific gravity can reduce the noise caused by the contact between the balls and the hole. , the movement of the retainer in the circumferential direction is smooth, the contact force between the ball and the hole is small, and wear is reduced.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1, 2, and 3. Incidentally, the same parts as in the conventional example are given the same reference numerals, and the description thereof will be omitted.

20 is the retainer body, which has the same number of holes 20a as the balls.
2ox, and the holes 20a to 20x have hole portions 21a to 21 with holes inside! is inserted to form a retainer 22. Further, balls are arranged so as to freely roll inside the holes 21a to 21x. In addition, if the retainer body 2o is made of plastic material, the holes 21a to 21x
is made of an iron-based material, and when the retainer body 2o is made of an iron-based material, the holes 21a to 21x are formed of a plastic-based material.

In the above configuration, when the retainer body 2o is made of a plastic material and the hole 21 is made of an iron material, the hole 2
Since the strength of the ball 1 is high, there is almost no wear, and since the specific gravity of the plastic is small, the movement of the retainer 22 in the circumferential direction is smooth, and the contact force between the ball 16 and the hole 21 is small, reducing wear. In addition, when the retainer body 2o is made of iron-based material and the hole 21 is made of plastic-based material, the ball 1
The noise caused by the contact between the retainer 23 and the hole 21 can be reduced, and the retainer 23 is filled with plastic having a small specific gravity.
The movement in the circumferential direction of the ball 16 and the hole 2 becomes smooth.
1. The contact force is small and wear is reduced.

Effects of the Invention As is clear from the above description, the present invention comprises: two mutually interlocking orbiting and fixed scrolls having wraps standing upright on end plates; a block for fixing the fixed scrolls; and a rotation prevention mechanism for performing a rotational movement, a plurality of balls arranged between the block and the rear surface on the opposite side of the end plate of the orbiting scroll, and a retainer for holding the balls so that the balls do not come into contact with each other. , since the retainer is provided with a hole in which the ball contacts and the retainer body are made of different materials, the retainer body is made of a plastic material,
When the hole is made of iron-based material, the strength of the hole is high, so there is almost no wear, and the specific gravity of the plastic is low, so the movement of the retainer in the circumferential direction is smooth, and the relationship between the ball and the hole is Small contact force reduces wear. In addition, if the retainer body is made of iron-based material and the hole is made of plastic-based material, the noise caused by contact between the balls and the hole can be reduced because the coefficient of restitution of the plastic is small, and the plastic with low specific gravity can be inserted. This allows the retainer to move smoothly in the circumferential direction, and the contact force between the υ balls and the hole is small, reducing wear.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts of a scroll compressor showing an embodiment of the present invention, FIG. 2 is a vertical sectional view of the scroll compressor shown in FIG. 4 is a longitudinal sectional view of a conventional scroll compressor, and FIG. 5 is a sectional view taken along line V-V in FIG. 4. 3...Block, 4...Fixed scroll, 5...Orbiting scroll, 6...Rotation prevention mechanism, 16a-16! ...Ball, 2o
...Retainer body, 21 ... Hole, 22
...Retainer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 5
Figure/6

Claims (3)

[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 for holding the balls so that the balls do not come into contact with each other, a hole that contacts the balls and a retainer other than the hole. A scroll compressor whose main body is equipped with a retainer made of another material. (2) The scroll type compressor according to claim 1, further comprising a retainer in which the hole is made of an iron-based material and the retainer body other than the hole is made of a plastic-based material. (3) The scroll type compressor according to claim 1, further comprising a retainer in which the hole portion is made of a plastic material and the retainer body other than the hole portion is made of an iron material.