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US 2014/0271305 A1Published application
Scroll Pump Having Bellows Providing Angular Synchronization and Back-up System For Bellows
AssigneeAgilent Technologies, Inc.
InventorRonald J. FORNI
Life of this patent
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Abstract
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.
Claims19
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.
6 more elements
A scroll pump comprising:
- a scroll blade set including a stationary scroll blade fixed in the pump and 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 operatively connected to the orbiting scroll blade so as to cause the orbiting scroll blade to orbit about a longitudinal axis;
- a metallic bellows having first and second ends, the second end being fixed in the pump, 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
- angular synchronization back-up means for maintaining an angular synchronization between the orbiting and stationary scroll blades in the event that a load on the orbiting scroll blade exceeds a rated load of the pump,
- wherein the angular synchronization back-up means comprises a plurality of pins extending axially in directions parallel to the longitudinal axis, and a guide part in which a plurality of openings open in said directions parallel to the longitudinal axis of the pump are defined, and
- the pins are fixed relative to one of the stationary and orbiting scroll blades in the pump, the guide part in which the openings are defined is fixed relative to the other of the stationary and orbiting scroll blades in the pump, and the pins extend axially in said directions parallel to the longitudinal axis into the openings, respectively.
4 more elements
A scroll pump comprising:
- a scroll blade set including a stationary scroll blade fixed in the pump and 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 operatively connected to the orbiting scroll blade so as to cause the orbiting scroll blade to orbit about a longitudinal axis parallel to a central axis of the orbiting scroll blade;
- a metallic bellows having first and second ends, the second end being fixed in the pump, 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 wherein the metallic bellows is the only means of preventing rotation of the orbiting scroll blade relative to its central axis in the pump;
- and
- back-up means for preventing damage to the pump if the metallic bellows should fail,
- wherein the back-up means comprises a plurality of pins extending axially in directions parallel to the longitudinal axis, and a guide part in which a plurality of openings open in said directions parallel to the longitudinal axis of the pump are defined,
- the pins are fixed relative to one of the stationary and orbiting scroll blades in the pump, the guide part in which the holes are defined is fixed relative to the other of the stationary and orbiting scroll blades in the pump, and the pins extend axially in said directions parallel to the longitudinal axis into the openings, respectively.
4 more elements
Dependencies are inferred from the claim text.