Submerged DC brushless motor and pump

Pumps – Motor driven – Including means utilizing pump fluid for augmenting cooling,...

Reexamination Certificate

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Details

C417S423300, C417S423900, C417S423120, C417S424100

Reexamination Certificate

active

08079829

ABSTRACT:
An in-line motor and pump assembly is supported at the bottom of a fuel storage tank by a pipe and an internal concentric conduit for housing electrical conductors extending therewithin to the motor. An impeller, coaxial with the rotor of the motor, draws the fuel into an annular passageway surrounding the stator of the motor. Further passageways convey the fuel to an annular passageway defined between the pipe and the conduit for discharge external of the storage tank. A low pressure environment attendant the inflow of the fuel is used to channel fuel for lubrication and cooling purposes to a lower journal bearing and thrust bearing supporting a common shaft for the impeller and the motor. A high pressure environment attendant outflow of fuel is used to channel fuel for lubrication and cooling purposes to a journal bearing supporting the upper end of the shaft.

REFERENCES:
patent: 2689529 (1954-09-01), Wightman
patent: 3694110 (1972-09-01), Guinard
patent: 4213745 (1980-07-01), Roberts
patent: 5127792 (1992-07-01), Katsuta et al.
patent: 5356272 (1994-10-01), Nagata et al.
patent: 7513755 (2009-04-01), Geisinger et al.
patent: 2004/0052645 (2004-03-01), Christensen

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