Progressing cavity pump

Details Progressing cavity pump Progressing cavity pump

2005-01-28

2008-08-19

Freay, Charles G (Department: 3746)

Pumps

With condition responsive pumped fluid control

Pressure responsive relief or bypass valve

C417S410400, C418S048000

Reexamination Certificate

active

07413416

ABSTRACT:
This progressing cavity pump includes a helical rotor (2) mounted to turn inside a helical stator (3). The stator (3) and the rotor (2) are disposed such that the cavities (4) formed therebetween move from the inlet (5) towards the outlet (6). In this cavity pump, hydraulic regulation (HR) means are provided for obtaining internal recirculation of the pumped fluid between at least two of the cavities (4) under conditions capable of performing at least one function selected from: achieving the desired pressure distribution along the pump, stabilizing the temperatures, controlling the leakage flow rates, and compensating for the volumes of compressed gas.

REFERENCES:
patent: 2765114 (1956-10-01), Chang
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patent: 5722820 (1998-03-01), Wild et al.
patent: 6149385 (2000-11-01), Vilagines et al.
patent: 6241494 (2001-06-01), Pafitis et al.
patent: 6457958 (2002-10-01), Dunn
patent: 6474939 (2002-11-01), Bratu
patent: 695 539 (1930-12-01), None
patent: 1 361 840 (1964-05-01), None
patent: 03 149377 (1991-06-01), None
patent: 1772423 (1992-10-01), None

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