JPH06185476A - Scroll compressor - Google Patents

Abstract

PURPOSE:To provide a scroll compressor having an eccentric structure suitable for a small machine. CONSTITUTION:A groove part 14 having such a shape as arranging a semicircle consecutively on one short side of a rectangle, is bored in an upper part of a driving shaft 10, and a cylindrical bushing 11c is fitted loosely to this, and it is energized in a semicircular wall direction of the groove part 14 by a bow shape cross sectional leaf spring 15. A turning scroll shaft 4c is inserted in the bushing 11c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly to an eccentric structure.

[0002]

2. Description of the Related Art As a scroll compressor of this type according to a conventional example, there is a compressor of a gas body such as Freon shown in FIG. In the figure, in a closed container 1 having a high-pressure chamber 2 inside, a fixed scroll 3 is formed by vertically arranging a spiral wrap 3b on a mirror plate 3a and forming a discharge hole 3c at substantially the center.
Is fixed, and a spiral wrap 4b is erected on one surface of the end plate 4a and a orbiting scroll 4 having an orbiting scroll shaft 4c on the other surface is eccentrically arranged by engaging the wraps. A suction chamber 6 and a discharge chamber 7 are provided at the outer periphery and the center of the compression chamber 5 formed between the wraps, respectively. On the other hand, the fixed scroll 3 is positioned below the orbiting scroll 4 and receives the thrust load thereof, and the fixed scroll 3
A drive bearing 9 is provided at the center of a frame 8 fixed to the shaft 8, and a swing bearing 11 is provided at the upper end of a drive shaft 10 driven by a motor (not shown) supported by the bearing 9.
Are provided eccentrically, and the orbiting scroll shaft 4c is inserted into the coaxial shaft 11. 2 and 3 are transverse cross-sectional views of the slewing bearing 11. The slewing bearing 11 shown in FIG. 2 has an eccentric circular recess formed in the upper portion of the drive shaft 10 and a cylindrical bushing 11a having an eccentric thickness is loosely fitted therein. And the orbiting scroll shaft 4c
Has been inserted. Further, in the structure shown in FIG. 3, a bushing 1 in which a substantially rectangular groove is formed in the upper portion of the drive shaft 10 and is loosely fitted to leave a space 12 at one longitudinal end thereof.
A shaft hole is formed in 1b, an orbiting scroll shaft 4c is inserted into the shaft hole, and a spring 13 is inserted into the space 12 to urge the bushing 11b in a direction in which the amount of eccentricity increases.

Therefore, when the drive shaft 10 rotates, the orbiting scroll shaft 4c is eccentric, and therefore receives a centrifugal force. In the case of FIG. 2, the bushing 11a is pressed to rotate.
In the case of FIG. 3, the eccentric amount is increased in the longitudinal direction so that the outer wall of the wrap 4b is always in contact with the inner wall of the wrap 3b.

However, since the centrifugal force is proportional to the rotational speed, the amount of eccentricity, and the mass of the orbiting scroll, considering the normal rotational speed, the one shown in FIG. 2 is not suitable for a small compressor, and the one shown in FIG. 3 is a spring. Since it compensates for the lack of centrifugal force, it can be used in small compressors, but it has the drawback of poor workability.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the above-mentioned conventional example, and an object thereof is to provide an eccentric structure suitable for a compact compressor.

[0006]

In order to solve the above problems, according to the present invention, a fixed scroll having a spiral wrap standing on a mirror plate is fixed in a closed container having a high-pressure chamber inside, and the mirror plate is also fixed. A spiral wrap is erected on one surface and an orbiting scroll having an orbiting scroll shaft on the other surface is eccentrically provided on the upper side of a drive shaft driven by a motor by eccentrically facing the wrap. In a scroll compressor in which the orbiting scroll shaft is inserted in an orbiting bearing, the orbiting bearing is formed in a tubular bushing, and a semicircle is continuously provided on one short side of a rectangle above the drive shaft. It is characterized in that a groove is formed and loosely fitted therein, and a spring is provided to bias the groove in the direction of the semicircular wall.

[0007]

The centrifugal force that acts on the orbiting scroll and the biasing force of the spring act on the bushing that is loosely fitted to adjust the amount of eccentricity, and the wrap of the orbiting scroll always contacts the wrap of the fixed scroll.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the eccentric structure of an orbiting scroll according to the present invention will be described below with reference to FIG. As shown in the drawing, a groove 14 having a shape in which a semicircle is continuously provided on one short side of a rectangle is bored in the upper part of the drive shaft 10, and a cylindrical bushing having a uniform wall thickness that is loosely fitted therein. 11c is provided and the orbiting scroll shaft 4c is inserted into the bushing 11c. The leaf spring 15 having an arcuate cross section is opened to the short side and is arranged between the bushing 11c and the bushing 11c to urge the bushing 11c toward the semicircular wall of the groove portion 14. At this time, the semi-circular wall is located slightly outside the position where the required eccentricity is obtained, and the spring pressure is sufficient to make the orbiting scroll shaft 4c half full when the wraps do not face each other even when the compressor operates at the minimum rotation speed. Designed to press against a circular wall.

Therefore, when the compressor is operated and the drive shaft 10 is rotated, the orbiting scroll shaft 4c is eccentric, so that it receives centrifugal force and the bushing 11a loosely fitted into the groove portion 1a.
4 in the direction of the semicircular wall to wrap the outer wall of wrap 4b with wrap 3
Always make contact with the inner wall of b to eliminate compression leakage. When operating at low speed rotation, the centrifugal force decreases, but the contact is continued due to the urging force of the leaf spring 15.

[0010]

Since the orbiting bearing for supporting the orbiting scroll shaft is a bushing loosely fitted in the eccentric position in the groove provided on the upper part of the drive shaft, and this is urged by the spring in the direction of increasing the eccentricity, Even if it is applied to a small compressor, the orbiting scroll wrap is always in contact with the fixed scroll wrap to prevent compression leakage, and the structure of the parts is simplified, so the manufacturing cost is reduced and the accuracy and reliability are improved. It is possible to achieve the excellent effect of

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a scroll compressor according to the present invention.

FIG. 2 is a cross-sectional view of a main part of a scroll compressor according to a conventional example.

FIG. 3 is a cross-sectional view of a main part of a scroll compressor according to another conventional example.

FIG. 4 is a vertical sectional view of a scroll compressor compression unit according to the present invention and a conventional example.

[Explanation of symbols]

 1 Airtight Container 3 Fixed Scroll 3b Wrap 4 Orbiting Scroll 4b Wrap 4c Orbiting Scroll Shaft 10 Drive Shaft 11 Orbiting Bearing 11a Bushing 11b Bushing 11c Bushing 14 Groove 15 Spring

Claims (1)

[Claims] 1. A fixed scroll in which a spiral wrap is erected on a mirror plate is fixed in a closed container having a high pressure chamber inside,
Similarly, a spiral wrap is erected on one surface of the end plate, and an orbiting scroll having an orbiting scroll shaft on the other surface is eccentrically opposed by meshing the wraps, and is eccentrically located above the drive shaft driven by the motor. In a scroll compressor in which the orbiting scroll shaft is inserted into an orbiting bearing provided, the orbiting bearing is formed into a tubular bushing, and a semicircle is continuously provided on one short side of a rectangle above the drive shaft. A scroll compressor characterized in that a groove portion having a shape is bored and loosely fitted therein, and a spring is provided to urge the groove portion in the direction of the semicircular wall.