JPH04269389A - Scroll compressor - Google Patents

Abstract

PURPOSE:To bring the lap of a second scroll into contact with the lap of a first scroll by the rotation of an eccentric bush fitted with the driven shaft of the second scroll. CONSTITUTION:An eccentric bush 36 is provided between an auxiliary bearing 10 and a driven shaft 20. The eccentric bush 36 is formed by shifting the center of an outer peripheral circle fitted to the auxiliary bearing 10 and the center of an inner peripheral circle to which the driven shaft 20 is fitted. The eccentric bush 36 is rotated in such a way that the center of the inner peripheral circle turns around the center of the outer peripheral circle. This enables improvement in the sealing performance of the lap between a first scroll 13 and a second scroll 14.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a scroll compressor that performs compression by rotating both scrolls in the same direction.

0002

2. Description of the Related Art A conventional scroll compressor is constructed as shown in, for example, Japanese Patent Laid-Open No. 62-282186. Here, a conventional example will be explained with reference to this publication. 4 and 5, reference numeral 50 denotes a closed container, in which a scroll compression element 51 is housed on the upper side, and an electric element 52 is housed on the lower side. Scroll compression element 51
is composed of a fixed scroll 53 and an oscillating scroll 54. The fixed scroll 53 is composed of an end plate 55 and a wrap 56 erected on the end plate. The swinging scroll 54 is composed of an end plate 57, a wrap 58 erected on the end plate, and a pin 59 protruding on the opposite side of the wrap. The fixed scroll 53 and the swinging scroll 54 have their wraps 56 and 58 engaged with each other to form a compression space 60 inside. This compression space is gradually reduced from the outside to the inside to compress the refrigerant.

A discharge hole 61 communicating with a compression space 60 is provided in the center of the end plate 55 of the fixed scroll 53 .

Reference numeral 62 denotes a rotating shaft, and a crank 63 for rotating the swinging scroll 54 is provided at the tip of the rotating shaft. An eccentric drive bearing groove 64 is formed in this crank. 65 is an eccentric bearing, and this eccentric bearing is provided with a hole 66 into which the pin 59 of the swinging scroll 54 is fitted. 67 is an elastic body that presses the eccentric bearing 65 within the eccentric drive bearing groove 64.

In the scroll compressor of this structure, the elastic body 67 presses the eccentric bearing 65 into which the pin 59 of the oscillating scroll 54 is fitted, so that the wraps 56 and 58 between the fixed scroll 53 and the oscillating scroll 54 are compressed in the radial direction. The gap is kept constant to prevent the cooling capacity from decreasing.

[0006]

However, in the conventional scroll compressor, the pin 59 of the oscillating scroll 54 is inserted into the eccentric drive bearing groove 64 of the crank while pressing the eccentric bearing 65 with the elastic body 67. Therefore, the elastic body 67 rotates together with the crank, and as centrifugal force acts on this elastic body during rotation, the pressing force of the elastic body 67 acting on the eccentric bearing changes, and the fixed scroll 53
There was a problem in that the gap in the radial direction between the laps 56 and 58 between the orbiting scroll 54 and the orbiting scroll 54 could not be made constant.

[0007] This invention solves the above problems.
It is an object of the present invention to provide a scroll compressor in which the wrap of a second scroll is pressed against the wrap of a first scroll.

[0008]

[Means for Solving the Problems] This invention houses an electric element and a scroll compression element in a closed container, and connects the scroll compression element to the electric element by erecting a spiral wrap on an end plate. a first scroll having an axis;
having an axis eccentric to the center of the axis of the first scroll;
a second scroll having a spiral wrap erected on an end plate that faces and engages with the first scroll; a main frame having a main bearing that pivotally supports the shaft of the first scroll; and this main frame. A scroll compressor comprising: an auxiliary frame having an auxiliary bearing that is connected to the auxiliary frame and pivotally supports the shaft of the second scroll; and a drive coupling device that rotates the second scroll in the same direction as the first scroll. A cylindrical eccentric bush is fitted between the shaft of the second scroll and the auxiliary bearing, and the center of the outer circumference in which the eccentric bush is fitted into the auxiliary bearing is an inner circumferential circle in which the shaft of the second scroll is fitted. The eccentric bush is formed such that the center of the inner circumferential circle revolves around the center of the outer circumferential circle.

[0009]

[Operation] This invention is configured as described above, so that
Rotating the eccentric bushing within the auxiliary bearing so that the center of the inner circumferential circle revolves around the center of the outer circumferential circle, and changing the eccentricity of the second scroll fitted to the eccentric bushing;
The wrap of the second scroll is pressed against the wrap of the first scroll.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on the embodiments shown in FIGS. 1 to 3.

Reference numeral 1 denotes a closed container, in which an electric element 2 is housed on the upper side, and a scroll compression element 3 is housed on the lower side. The electric element 2 is composed of a stator 4 and a rotor 5 disposed inside the stator. An air gap 6 is formed between the stator 4 and the rotor 5.

Reference numeral 7 denotes a main frame, and a main bearing 8 is provided in the center of this frame. Reference numeral 9 denotes an auxiliary frame mounted in pressure contact with the inner wall of the closed container 1, and this auxiliary frame has a main bearing 8 of the main frame 7 and an eccentric auxiliary bearing 10.
is provided. The main frame 7 and the auxiliary frame 9 are fixed with bolts 12 so as to form a hollow chamber 11 inside.

The scroll compression element 3 is composed of a first scroll 13 driven by the electric element 2 and a second scroll 14 rotated in the same direction as the first scroll. The first scroll 13 includes a disk-shaped end plate 15 , a spiral wrap 16 made of an involute curved line erected on one side of the end plate, and a spiral wrap 16 formed of an involute-shaped curved line erected on one side of the end plate 15 .
The drive shaft 17 is inserted into and fixed to the rotor 5 so as to protrude from the center of the other surface of the rotor 5 . The first scroll 13 constitutes a driving scroll. Second
The scroll 14 includes a disk-shaped end plate 18, a spiral wrap 19 made of an involute curved line erected on one side of the end plate, and a driven shaft protruding from the center of the other side of the end plate 18. It consists of 20. And the second
The scroll 14 constitutes a driven scroll.

The first scroll 13 has a drive shaft 17 supported by the main bearing 8 of the main frame 7, and the second scroll 14
The driven shaft 20 is pivotally supported by the auxiliary bearing 10 of the auxiliary frame 9, and the wraps 16 and 19 of both scrolls 13 and 14 face each other in the hollow chamber 11 and engage with each other to form a plurality of compression spaces 21 inside. I'm trying to form it.

The drive shaft 17 is provided with a discharge hole 23 for discharging the refrigerant compressed in the compression space 21 into a space 22 between the electric element 2 and the scroll compression element 3 in the closed container 1.

Reference numeral 24 denotes a regulating member for regulating the movement of the second scroll 14 in the axial direction, and this regulating member contacts the end plate 18 of the second scroll 14 and is fixed to the first scroll 13 with bolts 25. There is. A ball bearing 26 that contacts the outer periphery of the auxiliary bearing 10 is attached to the regulating member 24 . A plate 27 is attached to the lower part of the regulating member 24 and also serves to prevent the ball bearing 26 from coming off, and this plate forms a sealing surface to be described later.

Reference numeral 28 denotes an Oldham joint provided between the first scroll 13 and the second scroll 14. The first key 3 is fitted into the first key groove 30 provided on the outer periphery of the mirror plate 15.
1, and a second key 33 that is fitted into a second keyway 32 provided on the outer periphery of the end plate of the second scroll 14. And the Oldham joint 28 has a key 31,
33 in the keyways 30 and 32, the first and second scrolls 13 and 14 are caused to swing relative to each other.

34 is the main frame 7 and the first scroll 1
A sealing material 35 is provided between the auxiliary frame 9 and the plate 27, and these sealing materials use the high pressure gas in the space 22 as back pressure.

36 is the driven shaft 20 of the second scroll 14
and the auxiliary bearing 10, and the eccentric bushing is located between the center O of the outer circumferential circle fitted into the auxiliary bearing 10 and the center P of the inner circumferential circle fitted into the driven shaft 20.
It is formed eccentrically. The center O of the outer circumferential circle is located at a position further along the rotational direction of the driven shaft 20 than the center P on a line that is perpendicular to the line connecting the center P of the inner circumferential circle and the center R of the drive shaft 17 . The centers O, P, and R form a triangle. The eccentric bush 36 is provided with a protrusion 37 formed by a pin. This protrusion is loosely inserted into a recess 38 provided in the auxiliary frame 9. The movement of the eccentric bush 36 in the rotational direction is restricted by the recess 38.

The center O of the outer circle coincides with the center of the auxiliary bearing 10, the center P of the inner circle coincides with the center of the driven shaft 20, and the center R of the drive shaft 17 coincides with the center of the main bearing 8. There is.

39 is a suction pipe, and this suction pipe is connected to the hollow chamber 11.
It communicates within. 40 is a discharge pipe, and this discharge pipe is provided at the upper part of the closed container 1.

In the scroll compressor configured as described above, when the electric element 2 is rotated, its rotational force is transmitted to the first scroll 13 via the drive shaft 17. The rotational force transmitted to the first scroll is transmitted to the second scroll 14 via the Oldham joint 28, causing the second scroll to rotate in the same direction as the first scroll 13. The drive shaft 17 of the first scroll 13
The second scroll 14 rotates at a position offset from the center P of the driven shaft 20 with respect to the center R of the second scroll 14 . Therefore, the first scroll 13 and the second scroll 14 gradually reduce the compression space 21 formed by these scrolls from the outside toward the inside, and the hollow chamber 11 is removed from the suction pipe 39.
The refrigerant that has flowed inside is forced to flow into the compression space 21 on the outside and is compressed. This compressed refrigerant flows from the discharge hole 23 provided in the drive shaft 17 of the first scroll 13 into the space 22.
The liquid is discharged from the discharge pipe 40 through the air gap 6 of the electric element 2 to the outside of the closed container 1.

The eccentric bush 36 provided between the auxiliary bearing 10 and the driven shaft 20 is caused by the gas load acting within the compression space 21 and the frictional force caused by the rotation of the driven shaft 20 to cause the protrusion 3
7 and the concave portion 38. Therefore, the eccentric bush 36 moves so that the center P of the inner circumferential circle revolves around the center O of the outer circumferential circle, and the distance between this center P and the center R of the drive shaft 17 is widened. Then, the eccentric bushing 36 moves the second scroll 14 in a direction that brings the wraps 16 and 19 of the first scroll 13 into contact with each other, thereby bringing the wraps 16 and 19 of both scrolls 13 and 14 into contact with each other.

The eccentric bush 36 is located in the recess 3 of the auxiliary bearing 10.
By inserting the protrusion 37 into the auxiliary bearing 10 and the driven shaft 20, the auxiliary bearing 10 and the driven shaft 20 are prevented from moving freely or being misaligned.

[0025]

As described above, according to the present invention, a cylindrical eccentric bushing is fitted between the shaft of the second scroll and the auxiliary bearing, and the eccentric bushing is fitted into the outer circumference of the bushing fitted to the auxiliary bearing. This is because the center and the center of the inner circumferential circle into which the shaft of the second scroll is fitted are offset, and the eccentric bush is made such that the center of the inner circumferential circle revolves around the center of the outer circumferential circle. , the amount of eccentricity of the second scroll with respect to the first scroll can be changed, and the wrap of the second scroll can be brought into contact with the wrap of the first scroll during operation, and the sealing performance between both scrolls can be improved. be.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a scroll compressor showing one embodiment of the present invention.

FIG. 2 is a sectional view of the scroll compressor of the present invention taken along line A-A in FIG. 1;

FIG. 3 is an enlarged sectional view of a main part showing an assembled state of the eccentric bushing of the present invention.

FIG. 4 is a longitudinal sectional view of a conventional scroll compressor.

5 is a sectional view of a conventional scroll compressor taken along line BB in FIG. 4. FIG.

[Explanation of symbols]

1　Airtight container 2　Electric element 3 Scroll compression element 7 Main frame 8 Main bearing 9 Auxiliary frame 10 Auxiliary bearing 13 First scroll 14 Second scroll 15, 18　End plate 16, 19 lap 17 Drive shaft 20 Driven axis 28 Oldham joint 36 Eccentric bushing

Claims (2)

[Claims] Claim 1: A first scroll having an electric element and a scroll compression element housed in a closed container, the scroll compression element having a shaft connected to the electric element with a spiral wrap erected on an end plate. a second scroll having an axis eccentric to the center of the axis of the first scroll and having a spiral wrap erected on an end plate that faces and engages with the first scroll; a main frame having a main bearing that pivotally supports the shaft of the second scroll; an auxiliary frame that is connected to the main frame and has an auxiliary bearing that pivotally supports the shaft of the second scroll; In a scroll compressor configured with a scroll and an Oldham coupling that rotates in the same direction, a cylindrical eccentric bush is fitted between the shaft of the second scroll and an auxiliary bearing, and this eccentric bush is fitted into the auxiliary bearing. The center of the outer circumferential circle to be fitted is offset from the center of the inner circumferential circle to which the shaft of the second scroll is fitted, and the eccentric bush is formed so that the center of the inner circumferential circle revolves around the center of the outer circumferential circle. A scroll compressor characterized by: 2. The scroll compressor according to claim 1, wherein the eccentric bush is provided with a member for regulating rotation between the shaft of the second scroll and the auxiliary bearing.