Scroll machine using discharge pressure for axial sealing

摘要

A scroll compressor in which a fluid compressed by the machine is applied to one side of an orbiting scroll plate to provide an axial sealing force directed toward an opposing stationary scroll plate. Intermeshed involute wrap elements on facing surfaces of the two scroll plates define pockets in which the fluid is compressed as a motor drives one of the plates in an orbital motion relative to the other. Both the motor and scroll plates are enclosed in a hermetic shell. The volume enclosed by the shell is divided by the driven scroll plate and an internal supporting frame into one part that is at suction pressure and another part at discharge pressure. A seal extending from the frame abuts the back side of the driven scroll plate and defines the relative areas of that plate which are exposed to suction and discharge pressure. The net force resulting from these pressures acts on the orbiting plates, biasing it toward the stationary plate to provide axial sealing between the involute wrap elements and the scroll plates.