Positive displacement pump with improved rotor design

摘要

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.

主权项

1. A rotary lobe pump comprising:
a rotor housing defining a cavity between side walls, an end wall and a cover plate on the rotor housing; an inlet port and an outlet port communicating with the cavity through the side walls; a pair of rotors rotatably mounted in the rotor housing and having parallel axes of rotation, each rotor of said pair of rotors having a support member and a face directed towards one of the end wall and the cover plate; a first rotor pad adjacently disposed and detachably connected to each support member of the pair of rotors, said first rotor pad extending from the support member of each rotor of the pair of rotors 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 of each rotor of the pair of rotors from the one of the end wall and the cover plate by about a thickness of the portion of the first rotor pad, and said support member of each rotor of the pair of rotors having radially extending grooves which receive a portion of the first rotor pad therein; and wherein the first rotor pad of each rotor of the pair of rotors has shoulders extending from a base, said base being closer to the respective axis of rotation of the axes of rotation associated with each rotor of the pair of rotors than the shoulders of each first rotor pad associated with each rotor of the pair of rotors, and the respective shoulders of each first rotor pad having a thickness of less than half of the thickness of the base, and the at least one bore of each first rotor pad associated with each rotor of the pair of rotors extends through the base.