Pumps – Motor driven – Relatively movable pumping members driven by relatively...
Patent
1992-06-19
1993-06-29
Bertsch, Richard A.
Pumps
Motor driven
Relatively movable pumping members driven by relatively...
417426, 60 3948, 13759618, 91189A, 91193, F04B 3502
Patent
active
052228738
ABSTRACT:
A control valve assembly for alternately actuating a pair of fluid-driven free-piston devices by using fluid pressure communication therebetween. Each control valve is switched by a pressure signal depending on the state of its counterpart's piston. The communication logic is arranged to provide overlap of the forward strokes of the pistons, so that at least one of the pair will always be pressurized. Thus, uninterrupted pumping of liquid is made possible from a pair of free-piston pumps. In addition, the speed and frequency of piston stroking is entirely dependent on the mechanical power load applied. In the case of a pair of pumps, this enables liquid delivery at a substantially constant pressure over the full range of flow rates, from zero to maximum flow. One embodiment of the invention utilized two pairs of fluid-driven free-piston devices whereby a bipropellant liquid propulsion system may be operated, so as to provide continuous flow of both fuel and oxidizer liquids when used in rocket applications, for example.
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AIAA 91-1837, Free Piston Pumps for Miniature Rocket Propulsion, John C. Whitehead, 27th Joint Propulsion Conference, Jun. 24-26, 1991.
A Lightweight Pumped Hydrazine Maneuvering Vehicle, UCRL-JC-109568, John C. Whitehead, 1992 JANNAF Propulsion Meeting, Feb. 24-27, 1992.
Toews Hans G.
Whitehead John C.
Bertsch Richard A.
Freay Charles G.
Gaither Roger S.
Moser William R.
Sartorio Henry P.
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