Fluid circulation path for motor pump

Details Fluid circulation path for motor pump Fluid circulation path for motor pump

2005-04-26

2005-04-26

Tyler, Cheryl (Department: 3746)

Pumps

Motor driven

Pump within rotary working member

C417S423800, C417S410100, C417S366000, C417S369000, C417S423100, C417S357000

Reexamination Certificate

active

06884043

ABSTRACT:
A fluid pump includes a pump head having an inlet for receiving fluid at a first pressure and an outlet for outputting fluid at a second pressure greater than the first pressure. Pressurized fluid is directed through a first passage to the outlet without the pressurized fluid leaving the pump head prior to reaching the outlet. A second passage directs pressurized fluid to a fluid circulation path which is at least partially external to the pump head with the fluid circulation path terminating adjacent the outlet. Pressurized fluid passing through the first and second passages is directed to the outlet without being re-pressurized by the pump head. The first and second passages are in opposed relation to one another to provide balancing of thrust produced by the flow of pressurized fluid through the passages. An electric motor drives the pump head. The fluid circulation path may include portions of the electric motor.

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