Patent ID: 8403656
Filing Date: 2013-03-26
Classification: F04C,F05C

Abstract:
1. A rotary displacement pump, comprising: a stator; a rotor including a shaft portion and a radially protruding web having a configuration of an undulatory disk; a scraper comprising a single-piece solid body having an engagement slot of predetermined radial height and predetermined axial width, the engagement slot being between oppositely facing surfaces on the scraper body that engage opposite sides of the protruding web of said rotor; said stator including a generally cup shaped first member and a generally cup shaped second member, and defining a circumferential wall that encircles said radially protruding web of said rotor; said scraper being arranged within said stator, supported to be retained in a circumferential direction and to allow a reciprocating movement in a substantially axial direction; said stator together with said scraper defining