JP3086497B2 - Rotary scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a scroll fluid machine, and more particularly to a radial seal technology for a rotary scroll compressor as a fluid device for refrigeration, air conditioning, and hot water supply.

[0002]

2. Description of the Related Art Conventionally, a sealing technique in a radial direction in an orbiting scroll fluid machine has been disclosed in Japanese Patent Application Laid-Open No. 50-325.
No. 12 publication. However, the first and second
The centrifugal force is not generated in the rotary scroll compressor in which the two scrolls rotate, so that the above-mentioned sealing means cannot be applied, and only the improvement of the processing accuracy and the assembly accuracy of parts is relied on.

[0003]

In order to increase the efficiency of the rotary scroll compressor, it is necessary to minimize the radial gap. However, the rotation of each of the conventional first and second scrolls is required. In the method of fixing the amount of eccentricity of the shaft center, a high degree of machining accuracy and assembling accuracy of parts is required.

[0004]

In the rotary scroll compressor according to the present invention, the bearing portion of the second scroll is provided with the first scroll.
And the second scroll is rotatable about an axis different from the rotation axis of each of the two scrolls so that the axis of the second scroll is movable with respect to the axis of the first scroll, so that the gap between the meshing wraps is reduced. It can easily be zeroed to ensure the seal.

[0005]

[Function] The fluid is sealed between the wraps that mesh with each other,
When the space is reduced, the pressure of the fluid increases. This pressure becomes a force to expand the compression space, and the movable second
The rotation axis of the scroll moves in a direction away from the rotation axis of the first scroll, and the respective wraps come into contact with each other, so that there is no gap and the seal is reliably performed.

[0006]

1 is a longitudinal sectional view of a rotary scroll compressor according to a first embodiment of the present invention, and FIG. 1 and 2, an electric element 2 is placed in a closed container 1.
And the scroll compression element 3 are accommodated in series. The scroll compression element 3 has a spiral wrap 4a, is connected to the electric element 2, and rotates around the common axis A with the electric element 2. A second scroll 5 on the driven side having a wrap 5a having an axis B eccentric by an eccentric amount e with respect to the axis A, and having a wrap 5a engaged with the wrap 4a;
And an Oldham coupling 6 for rotating the second scrolls 4 and 5 in the same direction.
a, 5a.

A bush 7 of a bearing portion for supporting the shaft 5b of the second scroll 5 is rotatably held by the housing 8, and is parallel to the axis A and the axis B and different from the axis C.
The first scroll 4 is supported by a main bearing 9 (see FIG. 2).

In the above structure, the bush 7 is moved along the axis C by the fluid pressure acting on the second scroll 5 in the radial direction.
Around the axis B of the second scroll 5 so as to move away from the axis A of the first scroll 4 until the wrap 5a of the second scroll 5 contacts the wrap 4a of the first scroll 4. Thus, a radial seal of the compression chamber 3a is performed. At this time, the distance between the axis C of the bush 7 and the axis B of the second scroll 5 is determined by the wrap 5a.
a is not pushed too much.

FIG. 3 shows a second embodiment of the rotary scroll compressor according to the present invention. In FIG. 3, the bush 7a has a cover portion 7b, and a small through hole 5c is formed in the shaft 5b of the second scroll 5 to guide the high-pressure fluid during or after compression from the compression chamber 3a to the second scroll 5 so that the bush 7a has a back surface. Pressure is applied to hold the seals at the tips of the wraps 4a, 5a.

The operating principle of a rotary scroll compressor has been known for example from Japanese Patent Application Laid-Open No. 62-210279.

[0011]

The rotary scroll compressor according to the present invention does not require high-precision processing and assembly of parts as in the prior art, so that the cost can be reduced and the sealing between the meshing wraps can be reliably performed to achieve high efficiency. Is obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of a rotary scroll compressor according to the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a longitudinal sectional view of a second embodiment of the rotary scroll compressor according to the present invention.

[Explanation of symbols]

 3a Compression chamber 4 First scroll 4a Lap 5 Second scroll 5a Lap 7 Bush (bearing) A Axis B Axis C Axis e Eccentricity

Claims (2)

(57) [Claims] 1. A first scroll performs a rotary motion about an axis A by a drive source, and a second scroll meshes with the first scroll and is parallel to the axis A at a constant eccentric amount. , The volume of the compression chamber caused by the engagement of the first and second scrolls is continuously reduced by rotating in the same direction as the first scroll about the axis B extending in A rotary scroll compressor that performs
Is formed so as to be rotatable about the axis A different from the axis A and the axis B, and the axis B of the second scroll is movable with respect to the axis A of the first scroll. A rotary scroll compressor characterized by the following. 2. The rotary scroll compressor according to claim 1, wherein the bearing portion for supporting the second scroll having the movable axis B is rotatable about the axis C. Rotary scroll compressor made of.