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Scroll-type compressors

Imported: 24 Feb '17 | Published: 06 Jan '04

Shigeru Ito, Kiyofumi Ito

USPTO - Utility Patents

Abstract

A scroll-type compressor includes a fixed scroll member having a first spiral element, and an orbiting scroll member having a second spiral element. The first spiral element and the second spiral element interfit with each other at an angular offset and at a radial offset to form a plurality of fluid pockets which, are adapted to compress a fluid. Further, the first spiral element or the second spiral element, or both, include an interior wall surface defined by a first involute curve based on a circle, an exterior wall surface defined by a second involute curve based on the circle, an end wall surface formed at a center end of the spiral element by a first arc, and a fillet formed along a root of the end wall surface. Moreover, apportion of the fillet is formed by a second arc, and a line which is tangent to the circle and intersects the second involute curve includes a center of curvature of the first arc and a center of a curvature of the second arc.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present invention, the needs satisfied thereby, and the objects, features and advantages thereof, reference now is made to the following description taken in connection with the accompanying drawings.

FIG. 1 is a partial, plan view of a spiral element of a scroll-type compressor according, to a first embodiment of the present invention.

FIG. 2

a is a cross-section view of a spiral element of a scroll-type compressor according to a second embodiment of the present invention.

FIG. 2

b is a cross-sectional view of a spiral element of a scroll-type compressor according, to a third embodiment of the present invention.

FIG. 3 is a chart depicting the relationship between a space between the spiral elements and a crank angle, according to an embodiment of the present invention and known scroll compressor.

FIG. 4 is a longitudinal, cross-sectional view of a known scroll-type compressor.

FIGS. 5

a-c are cross-sectional views depicting a compression and a discharge stroke of the known scroll-type compressor.

FIG. 6 is a partial, perspective view of a spiral element of the known scroll-type compressor.

FIG. 7 is a partial, plan view of the spiral element of the known scroll-type compressor.

Claims

1. A scroll-type compressor, comprising:

2. The scroll-type compressor of claim 1, wherein the first spiral element and the second spiral element have a step-shape in cross-section.

3. The scroll-type compressor of claim 1, wherein the first spiral element and the second spiral element have a tapered shape in cross section.

4. A scroll-type compressor, comprising:

5. The scroll-type compressor of claim 4, wherein the first spiral element and the second spiral element have a step-shape in cross-section.

6. The scroll-type compressor of claim 4, wherein the first spiral element and the second spiral element have a tapered shape in cross section.