Eccentric screw pump with liquid bypass controlled by a flexible diaphragm
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Dec 5, 1995
Grant Date -
N/A
app pub date -
Sep 7, 1994
filing date -
Sep 7, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An eccentric screw pump with a pump casing (1) having an intake stub (6) and a delivery stub (7) and enclosing a suction chamber (8) and a delivery chamber (9). A stator (2) arranged in the said casing surrounds a rotor (3) that can be driven by a motor. In order to permit multi-phase delivery, a lower portion (9a) of the delivery chamber (9) is connected to the suction chamber (8) via a liquid bypass line having a valve opening (13) that can be actuated by a control element on the basis of the differential pressure between the delivery and the suction chambers (9, 8) in such a way that the valve (13, 14) is open in the case of the differential pressure which arises in the delivery of dry-running gas but is closed in the case of the differential pressure which arises during the delivery of liquid.
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