Scroll fluid machine

Abstract

A scroll fluid machine comprises a fixed scroll and an orbiting scroll that engages with the fixed scroll to form a compression chamber between the fixed and orbiting scrolls. Near the outer circumference of the fixed and/or orbiting scroll, an annular dust-seal groove is provided. In the groove, a dust seal fits to prevent a gas from coming into the compression chamber or from leaking out of the compression chamber. In the dust-seal groove, an annular holder or piece is provided to prevent heat from transferring to the dust seal.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The features and advantages of the invention will become more apparent from the following description with respect embodiments as shown in accompanying drawings wherein:

FIG. 1 is a vertical sectional side view of a fixed scroll in a scroll fluid machine;

FIG. 2 is an enlarged vertical sectional side view of the first embodiment of a scroll fluid machine according to the present invention;

FIG. 3 is an enlarged vertical sectional side view of the second embodiment of a scroll fluid machine according to the present invention;

FIG. 4 is an enlarged vertical sectional side view of the third embodiment of a scroll fluid machine according to the present invention;

FIG. 5 is an enlarged vertical sectional side view of the fourth embodiment of a scroll fluid machine according to the present invention;

FIG. 6 is an enlarged vertical sectional side view of the fifth embodiment of a scroll fluid machine according to the present invention;

FIG. 7 is an enlarged vertical sectional side view of the sixth embodiment of a scroll fluid machine according to the present invention;

FIG. 8 is an enlarged vertical sectional side view of the seventh embodiment of a scroll fluid machine according to the present invention;

FIG. 9 is an enlarged vertical sectional side view of the eighth embodiment of a scroll fluid machine according to the present invention;

FIG. 10 is an enlarged vertical sectional side view of the ninth embodiment of a scroll fluid machine according to the present invention;

FIG. 11 is an enlarged vertical sectional side view of the tenth embodiment of a scroll fluid machine according to the present invention;

FIG. 12 is an enlarged vertical sectional side view of the eleventh embodiment of a scroll fluid machine according to the present invention;

FIG. 13 is an enlarged vertical sectional side view of the twelfth embodiment of a scroll fluid machine according to the present invention; and

FIG. 14 is an enlarged vertical sectional side view of the thirteenth embodiment of a scroll fluid machine according to the present invention

Claims

1. A scroll fluid machine comprising: a fixed scroll having a fixed end plate; andan orbiting scroll having an orbiting end plate, a dust-seal groove being formed close to an outer circumference of the fixed and/or orbiting scroll, an annular holder that fits in the dust-seal groove, the annular holder being made of material having thermal conductivity lower than material of said scrolls and having a groove in which a dust seal fits.

2. A scroll fluid machine of claim 1 wherein the annular holder is cast together with the scroll when the scroll is cast.

3. A scroll fluid machine of claim 1 wherein the annular holder is fixed in the dust-seal groove.

4. A scroll fluid machine of claim 1 wherein the annular holder is pressingly fitted in the dust-seal groove.

5. A scroll fluid machine of claim 3 wherein the annular holder is fitted in the dust-seal groove owing to difference in thermal expansion rate.

6. A scroll fluid machine of claim 1 wherein the fixed and orbiting scrolls are made of Al or Al alloy and the annular holder is made of steel.

7. A scroll fluid machine of claim 1 wherein an unevenness is formed axially on an outer circumferential surface of the annular holder.

8. A scroll fluid machine of claim 1 wherein an unevenness is formed circumferentially on an outer circumferential surface of the annular holder.

9. A scroll fluid machine of claim 1 wherein a groove is radially formed on an outer circumferential surface of the annular holder.

10. A scroll fluid machine of claim 1 wherein a hole goes through a bottom wall of the annular holder.

11. A scroll fluid machine of claim 1 wherein a side wall of the annular holder becomes thicker towards a bottom.

12. A scroll fluid machine of claim 1 wherein a radial projection is provided at a bottom of the annular holder.

13. A scroll fluid machine comprising: a fixed scroll having a fixed end plate; andan orbiting scroll having an orbiting end plate, a dust-seal groove being formed close to an outer circumference of the fixed and/or orbiting scroll, an annular piece being formed on an inner circumferential surface of the dust-seal groove, the annular piece being made of metal having thermal conductivity lower than material of said scrolls.

14. A scroll fluid machine of claim 13 wherein the annular piece is formed by plating.

15. A scroll fluid machine of claim 13 wherein the annular piece is formed by thermal spraying.

16. A scroll fluid machine of claim 13 wherein the annular piece has unevenness.

17. A scroll fluid machine of claim 13 wherein the annular piece becomes thicker gradually towards a bottom of the dust-seal groove.