公开(公告)号：US3884599A

公开(公告)日：1975-05-20

申请号：US36890773

申请日：1973-06-11

Applicant: LITTLE INC A

Inventor： YOUNG NIELS O ,  MCCULLOUGH JOHN E

IPC: F01C1/02 ,  F01C21/00 ,  F04C23/00

CPC classification number: F01C1/0215 ,  F01C21/003 ,  F04C23/008 ,  F04C2250/10 ,  F05B2250/50

Abstract: A positive fluid displacement apparatus employing scroll members having interfitting spiroidal wraps angularly and radially offset such that as the spiral centers experience an orbiting motion, they define one or more moving fluid pockets of variable volume. The zones of lowest and highest pressures are connected to fluid ports. Radial sealing is accomplished with minimum wear by using a driving mechanism which provides a centripetal radial force adapted to oppose a fraction of the centrifugal force acting on the orbiting scroll member. The line contact sealing force between the wraps of the scroll members constitutes the sole radial constraining force. Coupling means which are separate from the driving means, and hence from the radial constraining means, are provided to maintain the desired angular relationship between scroll members. Axial sealing is attained by withdrawing a portion of fluid from the zone of highest pressure and using this high-pressure fluid to generate axial sealing forces. The apparatus may serve as a compressor, expander or pump.