Scroll type compressor having gradually thinned wall thickness

Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll

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418 50, F04C 1804

Patent

active

051510200

ABSTRACT:
A scroll type compressor has a stationary scroll (1) and a movable scroll (2) rotating around the former in an orbital manner, while forming volume variable sealed spaces therebetween to compress a coolant gas. To reduce a wall thickness of the scroll, an outer wall curve (E.sub.1.sup.+) of the scroll (1,2) is defined by the modification of a basic involute curve (D.sup.+) by reducing a certain value B.theta..sup.n) from a length (L.sub.0) of the respective involute line of the basic involute curve, which value is increased as the involute angle (.theta.) is developed, and an inner wall curve (E.sub.1.sup.-) is generated from the outer wall curve (E.sub.1.sup.+) by first transferring the respective point (p.sub.3, 4) on the outer wall curve (E.sub.1.sup.+) in the normal direction to the outer wall curve (E.sub.1.sup.+) at the respective point (p.sub.3, 4) by a distance (r) equal to a radius of the orbital circle (R) to form an intermediate curve (E.sub.1) and then symmetrically transferrring the respective point (p.sub.5) on the intermediate curve (E.sub.1) around the center (O.sub.1) of the basic circle (C.sub.1).

REFERENCES:
patent: 4382754 (1983-05-01), Shaffer et al.
patent: 4490099 (1984-12-01), Terauchi et al.
patent: 4627800 (1986-12-01), Matsudaira et al.

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