Cyclic hydraulic pump

Details Cyclic hydraulic pump Cyclic hydraulic pump

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 5/00 (2006.01) F04B 1/04 (2006.01) F04B 1/053 (2006.01) F04B 11/00 (2006.01) F04B 49/00 (2006.01) F04B 49/24 (2006.01)

Patent

CA 2157906

A two stage pump (10) has coaxial first (22) and second (24) stage reciprocating pumps with the second stage piston (76) reciprocably driven by the first stage piston (26). Multiple sets of first (22) and second (24) stage pumps are provided and the second stage pistons (76) can be returned by supercharge pressure, a loose connection between the first (26) and second (76) stage pistons, or a spring. An accumulator (402) which is charged on a compression stroke and discharges on an intake stroke may also be provided in communication with a pumping chamber (22) to improve the efficiency of a pump (10).

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