Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1984-07-02
1987-03-03
Chambers, A. Michael
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
91436, 91454, F16D 3102
Patent
active
046465189
ABSTRACT:
The invention relates to a driving unit for a feed pump, particularly for a crude oil feed pump which is suitable for recovery of energy. The delivery flow of a hydraulic variable displacement pump, in particular a pump of the axial piston type is used to perform the upstroke of the pump piston. A directional valve control means is provided to deliver the liquid volume displaced under pressure in the downstroke of the pump piston through the pump in the same direction of flow as for the upstroke. The pressurized fluid may either pass to a reservoir, wherein the pump drives a motor for supplying electrical energy back to the electric supply, or, respectively, may load a hydraulic accumulator which is connected to the suction port of the pump for performing the upstroke of the pump piston for which the accumulator is discharged, wherein the remaining torque only has to be supplied by the drive motor. The feed pump drive unit according to the present invention is of simple design and has a high lifetime which is particularly true due to the fact that the variable displacement pump is adjusted from the neutral zero stroke position in the same direction each for performing the upstroke as well as the downstroke of the pump piston, thus avoiding any adjustment in the reverse direction of adjustment.
REFERENCES:
patent: 3376792 (1968-04-01), Clarke et al.
patent: 3842943 (1974-10-01), Nakamura et al.
patent: 4014198 (1977-03-01), Herrmann
patent: 4085587 (1978-04-01), Garlinghouse
patent: 4240515 (1980-12-01), Kirkwood
patent: 4391571 (1983-07-01), Cruggs
Chambers A. Michael
Mannesmann Rexroth GmbH
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