| 摘要 |
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. One of the scroll members is caused to orbit along a path which is rigidly defined with respect to the machine frame by bearings and mechanical elements. The other of the scroll members does not orbit except in yielding response to forces applied to it by the fluid being processed and by forces applied by the orbiting scroll member. This other scroll member therefore makes small radial and axial accommodating motions which effect axial and radial sealing through externally applied axial forces and internally generated radial forces. The small radial motions of the accommodating scroll member result in its performing a small orbit in response to the totality of forces acting upon it. Hence this scroll member may be said to perform a minor orbit of small dimensions and is referred to as the "accommodating scroll member." The centrifugal force component produced by the orbiting of the one scroll and the motion of the other scroll is essentially all counterbalanced to leave the internally applied radial force as the primary radial sealing force. Fluid withdrawn from the zone of highest pressure is used as an axial sealing force. Coupling means are provided to maintain the desired angular relationship between the scroll members. The apparatus may serve as a compressor, expander or pump.
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