Rotary expansible chamber devices – Methods
Patent
1995-01-26
1995-10-17
Vrablik, John J.
Rotary expansible chamber devices
Methods
418 552, 418 555, 418 57, F01C 104
Patent
active
054584710
ABSTRACT:
A scroll-type fluid displacement apparatus has two interfitting spiral-shaped scroll members which have predetermined geometric configurations. The novel design provides desired displacement and a high built-in volume ratio, while at the same time achieving the optimum number of turns. The two scroll members can be either identical or non-identical. One scroll member is non-orbital and movable along its center axis. The non-orbital scroll member is urged by forces, mechanical or hydraulic, toward the other scroll member and is stopped by a positioning mechanism such that gaps are maintained between tips of one scroll member and bases of the other scroll member. A stabilizing mechanism prevents the scroll members from tipping. When abnormal operating conditions arise, for example, when contaminants or incompressible liquids move between the scroll members, or, when the tips and bases of the scroll members contact each other due to abnormal thermal growth, the non-orbital scroll member moves against the urging force along the direction of its center axis. Thus, galling may be prevented.
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