Rotary displacement pump comprising scraper and guide of the scraper
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United States of America Patent
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-
Dec 9, 2008
Grant Date -
Dec 27, 2007
app pub date -
Sep 16, 2005
filing date -
Sep 20, 2004
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A rotary displacement pump includes a stator (42) fixed in a housing (20), a rotor including a shaft portion (8), a radially protruding web (12), a scraper (110) having an engagement slot (112) engaging the protruding web (12). A guide (92) retains the scraper (110) in a circumferential direction and allows the scraper (110) to move reciprocatingly in a substantially axial direction. The scraper includes first, second and third grooves (120, 124 and 127). The grooves are designed so that they accommodate a portion of the guide (92) and allow the reciprocating movement of the scraper (110).
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