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Title: Fluid-driven reciprocating apparatus and valving for controlling same

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.

Inventors:
 [1];  [2]
  1. (Davis, CA)
  2. (East Aurora, NY)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
868826
Patent Number(s):
US 5222873
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
fluid-driven; reciprocating; apparatus; valving; controlling; control; valve; assembly; alternately; actuating; pair; free-piston; devices; fluid; pressure; communication; therebetween; switched; signal; depending; counterpart; piston; logic; arranged; provide; overlap; forward; strokes; pistons; pressurized; uninterrupted; pumping; liquid; pumps; addition; speed; frequency; stroking; entirely; dependent; mechanical; power; load; applied; enables; delivery; substantially; constant; range; flow; rates; zero; maximum; embodiment; utilized; pairs; whereby; bipropellant; propulsion; operated; continuous; fuel; oxidizer; liquids; rocket; applications; example; pressure signal; signal depending; power load; continuous flow; substantially constant; flow rates; flow rate; control valve; valve assembly; fluid pressure; constant pressure; mechanical power; reciprocating apparatus; provide continuous; load applied; piston device; free-piston devices; liquid delivery; fluid-driven free-piston; fluid-driven reciprocating; pressure communication; piston pump; alternately actuating; communication therebetween; /417/60/91/137/

Citation Formats

Whitehead, John C., and Toews, Hans G. Fluid-driven reciprocating apparatus and valving for controlling same. United States: N. p., 1993. Web.
Whitehead, John C., & Toews, Hans G. Fluid-driven reciprocating apparatus and valving for controlling same. United States.
Whitehead, John C., and Toews, Hans G. Fri . "Fluid-driven reciprocating apparatus and valving for controlling same". United States. https://www.osti.gov/servlets/purl/868826.
@article{osti_868826,
title = {Fluid-driven reciprocating apparatus and valving for controlling same},
author = {Whitehead, John C. and Toews, Hans G.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {1}
}

Patent:

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