SCROLL FLUID MACHINE

Abstract

In a scroll fluid machine, a fixed scroll has a fixed wrap, and an orbiting scroll has an orbiting wrap which engages with the fixed wrap to form a compressing chamber between the orbiting and fixed wraps. The orbiting scroll is rotatably mounted around an eccentric axial portion of a driving shaft and revolved by the driving shaft. A gas introduced from the outer circumference of the fixed scroll is compressed in the compressing chamber as it flows towards the center. Parts near the center is heated by a compressed gas. On the other surface of the fixed scroll to the surface having the fixed wrap, a plurality of cooling fins are provided. Air is introduced between the cooling fins to cool the machine. Between the cooling fins, a heat-releasing projection is provided to improve cooling efficiency.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

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

FIG. 1 is a front elevational view of a scroll fluid machine according to the present invention;

FIG. 2 is a vertical sectional view taken along the line II-II in FIG. 1;

FIG. 3 is a horizontal sectional view taken along the line III-III in FIG. 1;

FIG. 4 is a front view of another embodiment of a heat-releasing projection; and

FIG. 5 is a front view of further embodiment of the heat-releasing projection.

Claims

1. A scroll fluid machine comprising: a driving shaft having an eccentric axial portion;a fixed scroll having a fixed wrap on a surface;an orbiting scroll having an orbiting wrap, the orbiting scroll being rotatably secured around the eccentric axial portion of the driving shaft, the orbiting wrap engaging with the fixed wrap to form a compressing chamber, a gas introduced from an outer circumference of the fixed scroll into the compressing chamber being compressed as it flows towards a center;a plurality of cooling fins on the other surface of the fixed scroll to the surface having fixed wrap; anda heat-releasing projection between the adjacent cooling fins.

2. A scroll fluid machine of claim 1 wherein the heat-releasing projection is provided close to the outer circumference of the fixed scroll.

3. A scroll fluid machine of claim 1 wherein the heat-releasing projection is radially disposed in straight along a radius from a center of the fixed scroll.

4. A scroll fluid machine of claim 1 wherein the heat-releasing projection is lower in height than the cooling fin.

5. A scroll fluid machine of claim 1 wherein the heat-releasing projection is inclined with respect to a radius of the fixed scroll.

6. A scroll fluid machine of claim 1, further comprising a cover plate over the cooling fins of the fixed scroll, the cover plate contacting the cooling fins, but not contacting the heat-releasing projection.

7. A scroll fluid machine of claim 1 wherein the heat-releasing projection comprises a forked portion at a radially inner end.

8. A scroll fluid machine of claim 1 wherein the heat-releasing projection is mounted to the cooling fin and extends circumferentially between the adjacent cooling fins.