Pump with fluid bearing

Details Pump with fluid bearing Pump with fluid bearing

1993-07-28

1995-01-03

Bertsch, Richard A.

Pumps

Motor driven

Resiliently mounted pump or motor

417369, 417370, 41742312, F04B 1700

Patent

active

053781210

ABSTRACT:
A pump including a submersible motor sealed within a motor chamber, an impeller rotatably mounted in an impeller chamber, and motor and impeller shafts coupled to one another to interconnect the motor and impeller. The impeller pumps fluid from the impeller chamber into the motor chamber where the fluid flows around the motor to cool the motor and muffle the motor noise before being discharged from the pump. The impeller shaft is rotatably mounted in a bearing fixed to the impeller housing and having grooves facing the shaft and providing fluid communication between the impeller and motor chambers. Fluid flows into the grooves from the impeller or motor chamber depending on the pressure gradient across the bearing, which varies according to downstream pump conditions (e.g., pressure). As the impeller shaft continues to rotate, fluid from the grooves forms a thin lubricating film in the clearance space provided between the impeller shaft and bearing. With this construction, the need for conventional impeller shaft seals is eliminated.

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patent: 4768925 (1988-09-01), Geupel
patent: 4822258 (1989-04-01), Matsuda et al.
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patent: 5055006 (1991-10-01), Kobayashi et al.
patent: 5088900 (1992-02-01), Yoshioka et al.
patent: 5118264 (1992-06-01), Smith
patent: 5151016 (1992-09-01), Her
patent: 5178523 (1993-01-01), Cheng-Chung

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