Reciprocating pump for the pulsation-free delivery of a liquid
AssigneeZumtobel Aktiengesellschaft
InventorsHerbert Funke, Hans-Jurgen Riggenmann
Life of this patent
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Abstract
A piston pumping system is disclosed having a pair of piston pumps operated by plungers with roller follows which ride in rotary cam plate grooves. The grooves are arranged such that the delivery of each pump overlaps the suction of the other pump. Means are provided to sense any pulsations in pressure to change the cam speed during the precompression phase of operation and means are provided to sense delivery pressure and to adjust cam plate speed during the interval between the initial phase of delivery and the end of the precompression stroke.
Claims9
A reciprocating piston pump for the pulsation-free delivery of a fluid with the use of at least two cylinders connected parallel on their discharge side, of which one in each instance sucks and the other delivers, in which the pistons working in said cylinders are controlled by a cam plate driven by rotary drive means, and in which each piston, for the purpose of compensating for the compressibility of the fluid, is caused to perform a precompression stroke following a shortened suction stroke wherein, during said precompression stroke, the piston speed is initially increased abruptly and then declines again until the end of the precompression stroke, characterized in that the length of the precompression stroke has a constant value, that the rotary speed of said drive means is reduced to a lower value at the beginning of fluid delivery and is restored to its normal value by the end of the precompression stroke.
Dependencies are inferred from the claim text.