Scroll-type fluid machine with back pressure chamber biasing an

Details Scroll-type fluid machine with back pressure chamber biasing an Scroll-type fluid machine with back pressure chamber biasing an

1984-06-18

1985-12-10

Vrablik, John J.

Rotary expansible chamber devices

Working member has planetary or planetating movement

Helical working member, e.g., scroll

418 57, F01C 104

Patent

active

045576750

ABSTRACT:
A scroll-type fluid machine having an orbiting scroll member and a stationary scroll member each having an end plate and a spiral wrap of at least two turns protruding upright from one of the sides of the end plates. The orbiting scroll member has a back pressure chamber formed on the back side thereof and communicating with the compression spaces of the fluid machine through pressure equalizing ports formed in the orbiting scroll member, so that the pressure of the fluid under compression is introduced to the back pressure chamber to produce an axial thrusting force for pressing the orbiting scroll member towards the stationary scroll member. The positions of the pressure equalizing ports in terms of the wrap angle .lambda. of the wraps are selected to meet the following condition:

REFERENCES:
patent: 3884599 (1975-05-01), Young et al.
patent: 3994633 (1976-11-01), Shaffer
patent: 4365941 (1982-12-01), Tojo et al.
patent: 4475874 (1984-10-01), Sato

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