Centrifugal pump having means for counterbalancing unbalanced fl

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

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417423R, 415 53T, 415213T, F04B 3906, F04B 3504, F04D 500

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044458215

ABSTRACT:
A fuel pump apparatus has an electric motor and a regenerative pump having a pump housing and an impeller rotated by the motor shaft journalled by a bearing to the pump housing. The impeller is operative to produce in the pump housing a fluid pressure which is unbalanced in the circumferential direction of the impeller and forms circumferentially unbalanced radially inward forces the resultant force of which is applied through the impeller to a first side of the peripheral surface of the shaft. The discharge port of the pump is open to the interior space within the motor. An opening is formed in the bearing and has an inner end faced to a second side of the peripheral surface of the motor shaft substantially diametrically opposite to the first side, whereby the discharge pressure of the pump is applied through the motor interior space and through the opening in the bearing to the second side of the motor shaft to counterbalance to the resultant force of the circumferentially unbalanced radially inward forces applied to the motor shaft.

REFERENCES:
patent: 2704516 (1955-03-01), Mock et al.
patent: 3119343 (1964-01-01), White
patent: 3418991 (1968-12-01), Shultz et al.
patent: 3995975 (1976-12-01), Bosch

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