Scroll Pump Having Bellows Providing Angular Synchronization and Back-up System For Bellows

摘要

A scroll pump has a metallic bellows that angularly synchronizes the stationary and orbiting scroll blades of the pump, and a hack-up system for the bellows. The back-up system consists of pins integral with and fixed relative to one of the stationary and orbital parts of the scroll pump, and a guide part that is integral with and fixed relative to the other of the stationary and orbital parts. The back-up system may be a non-contacting hack-up system in which there is no contact between the pins and guide part during normal operation of the pump. Therefore, no particles are created by a wearing away of such parts which would otherwise have the potential to contaminate the fluid being worked by the pump and reduce the useful life of the pump.

主权项

1. A scroll pump comprising:
a frame; a stationary plate scroll fixed to the frame and having a stationary scroll blade centered about a longitudinal axis of the pump, wherein the frame and the stationary plate scroll are a stationary part of the pump; an orbiting plate scroll haying an orbiting scroll blade juxtaposed with the stationary scroll blade in a radial direction of the pump such that the stationary and orbiting scroll blades are nested; an eccentric drive mechanism supported by the frame and operatively connected to the orbiting scroll blade so as to cause the orbiting scroll blade to orbit about the longitudinal axis, and wherein the eccentric drive mechanism supports the orbiting scroll blade so as to be rotatable about a second axis that is parallel to the longitudinal axis, wherein the orbiting plate scroll is an orbital part of the pump; a metallic bellows having first and second ends, the metallic bellows being fixed at the second end thereof to the frame, and the orbiting scroll blade being fixed to the metallic bellows at the first end of the metallic bellows such that the metallic bellows angularly synchronizes the orbiting and stationary scroll blades; and a non-contacting back-up system comprising a plurality of pins extending axially in directions parallel to the longitudinal axis of the pump from one of the stationary and orbital parts of the pump, and a guide part fixed relative to the other of the stationary and orbital parts of the pump and in which a plurality of openings are defined, the openings also extending axially in said directions parallel to the longitudinal axis of the pump, and wherein the pins extend axially in said directions parallel to the longitudinal axis into the openings, respectively, and each of the pins is spaced in its entirety from said other of the stationary and orbital parts of the pump and such that a radial clearance exists between each pin and the surface of the guide part that delimits the opening into which the pin extends.