Scroll compressor with reverse offset at wrap tips

Details Scroll compressor with reverse offset at wrap tips Scroll compressor with reverse offset at wrap tips

1997-09-16

2000-09-19

Vrablik, John J.

Rotary expansible chamber devices

Working member has planetary or planetating movement

Helical working member, e.g., scroll

F04C 1804

Patent

active

061202681

ABSTRACT:
An improved geometry for scroll wrap inner portion includes a groove which facilitates opening of the compression chambers to the discharge ports early in the cycle of the orbiting scroll. Stated one way, a forward end of the scroll wrap tip is thinner than a portion spaced from the forward end. A first curve defines the forwardmost end of said tip and extends to a forward ledge. A second circular curve is spaced from the forward ledge and extends to a rear ledge. An intermediate curve connects the forward and rear ledges. The rear curve is centered on a second radius, and if the second radius were extended beyond the rear ledge, the extension would move to a position spaced from the forward ledge and towards the opposed wrap. The swing radius for the scroll compressor wrap measured begins at the position wherein the forward ledge of one wrap faces the rear ledge of an opposed wrap begins on one side of zero, then crosses zero with an increasing scroll wrap, and then moves to an opposed side of zero. The inventive scroll compressor wrap achieves more rapid and smooth opening of the compression chambers to the discharge ports.

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Derivation of a General Relation Governing the Conjugacy of Scroll Profiles; James W. Bush and Wayne P. Beagle; Purdue 1992.
Maximizing Scroll Compressor Displacement using Generalized Wrap Geometry; James W. Bush, Wayne P. Beagle, Mark E. Housman; Purdue 1994.
Performance and Application of High Pressure Ratio Scroll Compressors; Alexander Lifson, James W. Bush, H. Ezzat Khalifa; AES vol. 34, heat Pump and Refrigeration Systems Design, Analysis and Applications.
General Stability and Design Specification of the Back-Pressure Supported Axially Compliant Orbiting Scroll; James W. Bush, David K. Haller, Christopher R. Galante; Purdue 1992.

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