Patent · US Active

Eccentric screw pump with overpressure protection

US9920758B2 · kind B2 · utility

0Cited by

4References

5Claims

0Family size

Assignee

WILO SE · DE

Inventors

Guenter Strelow · Bochum, DE
Thomas G. Mueller · Wolfsburg, DE
Roland Stracke · Unna, DE
Viktor Warkentin · Dortmund, DE

Key dates

Filing date	Feb 6, 2014
Grant date	Mar 20, 2018
Priority date	—
Expiry date	Aug 16, 2034

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF04C2250/30
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

An eccentric screw pump comprising an outer part (2) and an inner part (3) therein, one of the parts (2, 3) being driven rotatably and the other part (2, 3) being able to move eccentrically relative to the other part (3, 2). The screwthreads (5a, 5b) of the outer part (2) extend angularly over less than an entire helix along the axial length (L) of the part, so that during operation pumping chambers that are open to both ends are created, through which sudden pressure relief takes place.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.