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US 8,087,914 B1Granted
Positive displacement pump with improved rotor design
OwnerHarry Soderstrominventor
Life of this patent
Estimating the term…
Abstract
An improved positive displacement pump provides improved wear characteristics. Specifically, rotor pads are provided on faces relative to an internal portion of the rotor housing as it relates to an end wall and a rear side of a cover plate. The rotor pads preferably have at least one of anti-galling and/or anti-friction or anti-wear characteristics thereby providing improvements over the prior art. A central member is preferably provided so that pad replacement may be relatively easily performed in the field in clean in place operations.
Claims19
A rotary lobe pump comprising:
- a rotor housing defining a cavity intermediate side walls, an end wall and a cover plate in the rotor housing;
- inlet and outlet ports communicating with the cavity through the side walls;
- a pair of rotors rotatably mounted in a rotor chamber and having parallel axes of rotation, said rotors having a first end directed towards one of the end wall and the cover plate;
- said rotor having at least a first rotor pad extending from a support member towards the one of the end wall and the cover plate with at least a portion of the first rotor pad spacing the support member from the one of the end wall and the cover plate by about a thickness of the portion of the first rotor pad, and an interface being formed intermediate the support member and the rotor pad.
1 more element
A positive displacement pump comprising:
- a rotor housing defining a cavity intermediate side walls, an end wall and a cover plate in the rotor housing;
- inlet and outlet ports communicating with the cavity through the side walls;
- a pair of rotors rotatably coopering in the rotor chamber to pump material from the inlet port to the outlet port, said rotors having parallel axes of rotation along shafts, said rotors having a first end directed towards one of the end wall and the cover plate;
- said rotor having at least a first rotor pad extending from a support member towards the one of the end wall and the cover plate, and said rotors being operably coupled to the shaft for rotation with the shaft while not being directly secured to the shaft thereby allowing movement in at least one direction along the axis of rotation during pump operation.
1 more element
Dependencies are inferred from the claim text.