JPS61241479A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To reduce the noise due to metallic contact between ball and retainer by enclosing plural number of balls supporting the thrust force of revolving scroll in a buffer which has a height more than the radius of ball and is formed by a material having low restitution coefficient. CONSTITUTION:Plural number of balls 15 for supporting the thrust force of a revolving scroll 5 are arranged around the outer circumference of the rotation preventing mechanism 6 of a scroll type compressor. Each of these balls 15 is enclosed in a cylindrical buffer 20 which, as a substitute for the conventional retainer, has a height more than the radius of ball and is formed by engineering plastic and the like having low restitution coefficient. Thus, metallic contact between balls 15 each other and between ball 15 and retainer can be prevented, and consequently the noise thereby can be reduced.

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 noise reduction in a system in which thrust force is maintained by balls.

Conventional technology The conventional configuration will be explained with reference to FIGS. 4 to 7.

1 is a sealed casing, 2 is an electric motor section, and a block 3. Fixed scroll 4. 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 flap 4b having a uniform thickness and an involute or a curve similar to an involute standing upright on the end plate 4a,
It is fixed to the block 3 with a mirror plate 4a. The orbiting scroll 6 is composed of an end plate εa and a wrap 6b that stands upright on the end plate 6a and has the same curve as the wrap 4b of the fixed scroll 4, and the end plate 6a
The block 3 is sandwiched and supported with a clearance A provided between the block 3 and the block 3, and is restrained by an anti-rotation mechanism 6. The fixed scroll 4 and the orbiting scroll 6 are arranged at the winding end ends 4b' and s) of each wrap 4b and sb, respectively. They are placed together with the two sides shifted by a certain angle.

8 is a discharge hole, and e 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 impoliate of the fixed scroll 4. Reference numeral 10 denotes a protrusion provided on the surface of the orbiting scroll 60 opposite to the wrap 5b, and is concentric with the center of the involute of the wrap 6b. 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 1o 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 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 5, and the wrap 5b side of the orbiting scroll 6 communicates with a lower pressure section than the clearance A between the end plates 5a and 4a.

158 to 15x are a plurality of balls arranged between the opposite wrap side of the end plate 5a of the orbiting scroll 5 and the block 3;
is a retainer, and the balls 15a to 15x have the same number of holes 18 as the balls 15a to 16I drilled in the retainer 16.
Rolls freely within a to 16x. 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 11 accompanying the rotation of the electric motor section 2 is transmitted to the orbiting scroll 6 via the boss section 11a and the protrusion section 10, but due to the action of the rotation prevention mechanism 6, the orbiting scroll 5 does not rotate on its own axis and remains a fixed scroll. It rotates around the center of the involute No. 4 as the center of rotation. At this time, the end tsb' of the wrap 6b of the orbiting scroll 5 contacts the wrap 4b of the fixed scroll 4, and the end 4b' of the wrap 4b of the fixed scroll 4 contacts the wrap 6b of the orbiting scroll 6. The state in which the suction is completed, and as the orbiting scroll 6 revolves, the wrap 4b and the wrap 6
The pressure in the compression space S increases as the two points of contact between b come closer to the center of the involute.

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 discharged into the -H sealed casing 1 through the discharge pipe 18, it is 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
Clearance A is provided in the back pressure chamber 14 on the back of the orbiting scroll 6.
A part of it is held by the low pressure introduced through it, and most of it is held by the end plate 5a of the orbiting scroll 6,
It is held by balls 15a to 16x which are disposed between the blocks 3 and freely roll within holes 16a to 16x of the retainer 16 in synchronization with the orbiting movement of the orbiting scroll 5.

Problems to be Solved by the Invention In such a conventional configuration, the thrust force is reliably maintained, but in order to reduce friction loss, a plurality of balls are configured to freely roll inside the metal glue tenor. Because of this, there was a problem in that the collision noise caused by the contact of the ball catching tenor was large, especially at high speeds. In addition, if the retainer material in its current form is replaced with a material other than metal, such as Teflon, which has a low coefficient of restitution, there will be reliability problems such as breakage if the retainer is thin, and if the retainer is made thicker. In this case, it becomes impossible to mold the material by punching, which not only increases the number of man-hours required to form the hole, but also causes problems such as an increase in material costs.

The present invention solves the above-mentioned drawbacks of the conventional example, and instead of using a retainer, the ball is surrounded by a buffer made of a material with a small coefficient of restitution, thereby reducing noise caused by contact and collision between the balls. The purpose is to reduce the number of man-hours and material costs.

Means for Solving the Problems In the present invention, instead of the conventional glue tenor, a ball is placed in a cylindrical buffer made of a material with a small coefficient of restitution.

Effect The present invention has the above-mentioned configuration, which allows the balls to roll freely within the buffer body, resulting in low friction loss, and reduces noise caused by contact and collision between the balls. By using a body, man-hours and material costs can be reduced.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1, 2, and 3. It should be noted that the same parts as in the conventional example are given the same reference numerals and explanations will be omitted.

20a to 20x are cylindrical, and the height H is the radius R of the ball.
The above is a cushioning body molded from a material with a small coefficient of repulsion, such as engineering plastic such as Teflon, and the balls 15a to 15! It can be stored freely by rolling around. Buffers 20a to 2o! are arranged so as to be in contact with the adjacent buffer bodies, but are not particularly fixed.0 In the above configuration, as the pressure in the compression space S increases, the space between the fixed scroll 4 and the orbiting scroll 6 moves in the thrust direction. When a thrust force is generated to pull them apart, the balls 15a to 15I retain most of the thrust force, and further roll within the buffer bodies 20a to 2ox in accordance with the orbiting movement of the orbiting scroll 6, as in the conventional case. At this time, ball 15
a to 15x collide with the buffers 20a to 20x, but the buffers 20a to 20x are made of a material with a small coefficient of repulsion, making them less noisy than the conventional contact between metals such as a glue tenor and a ball. is drastically reduced.

In addition, it has a cylindrical shape, so it can be easily molded by pultrusion molding using materials such as Teflon, and there are no problems such as breakage, compared to using a material with a small coefficient of restitution and making the retainer thicker with Sugibayashi. Material costs are also lower.

Effects of the Invention As is clear from the above description, the present invention comprises an orbiting scroll and a fixed scroll that engage with two parts having wraps that stand upright on an end plate, a block that fixes the fixed scroll, and a block that prevents the orbiting scroll from rotating. An anti-rotation mechanism that performs a rotating motion, a plurality of balls arranged so as to be in contact with the back surface of the orbiting scroll on the non-wrapping side and between the blocks, and a cylindrical shape with a height greater than or equal to the radius of the balls and a small coefficient of repulsion. It is equipped with a buffer made of material, and the ball is housed in the buffer, so even if the ball rolls inside the buffer and the ball collides with the buffer, the buffer is made of a material with a small coefficient of repulsion. Not only is it effective in reducing noise because of its cylindrical shape, it is easy to mold, reducing the number of man-hours. Furthermore, when using a material with a small coefficient of repulsion and increasing the thickness with a retainer shape. It has the advantage of lower material costs compared to other methods.

[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. 1, and Fig. 3 is a 4 is a vertical cross-sectional view of a conventional scroll compressor, FIG. 5 is a view taken along the line v-v' in FIG. 4, and FIG. 7 is an enlarged view of a thrust holding section using a conventional ball-retaining tenor. 4... Fixed scroll, 4a... Fixed scroll end plate, 4b... Fixed scroll wrap, 6... Orbiting scroll, 5a...
... End plate of the orbiting scroll, 6b... Wrap of the orbiting scroll, 6... Autorotation prevention mechanism, 15a
~15I...Ball, 20a~20 x...
...Buffer. Name of agent: Patent attorney Toshio Nakao and 1 other person3-
--10゛tsuku S-1 single turn 1 concave scroll deer/kick-socket body 3-11 holder 3rd figure sa, ---1 self-rotating scroll mirror plate 6M---wheel 2 and λ77L ---1 taku [if ipt;Syu evening 411 Figure 5 Figure 6 Figure 7 evening

Claims (1)

[Claims] two mutually interlocking orbiting scrolls and a fixed scroll having wraps standing upright on the end plate; a block for fixing the fixed scroll; an anti-rotation mechanism for preventing rotation of the orbiting scroll and allowing the orbiting movement to occur; and an end plate of the orbiting scroll. a plurality of balls arranged between the rear surface on the non-wrapping side and the block, and a buffer body having a cylindrical shape with a height greater than or equal to the radius of the balls and made of a material with a small coefficient of repulsion, and the balls are placed in the buffer body. Scroll type compressor housed in.