Pumps – Three or more cylinders arranged in parallel – radial – or...
Patent
1996-03-19
1998-03-31
Thorpe, Timothy
Pumps
Three or more cylinders arranged in parallel, radial, or...
417516, 13762521, 13762569, 91503, F04B 112
Patent
active
057331057
ABSTRACT:
A reciprocating piston pump provides pulseless delivery of liquid. It is suitable for use in compact environments or for the delivery of small amounts of liquid, as in chromatographic analysis devices. The pump includes two pistons with pumping chambers that are alternately connected to inflow and outflow lines through a control valve. The control valve moves between a first position in which inflow is directed to the first piston chamber and outflow to the second piston chamber, and a second position in which outflow is directed to the first piston chamber and inflow is directed to the second piston chamber. Each outflow pulse from the piston is sustained longer than each inflow pulse, and the outflow pulses are staggered and partially superimposed to provide substantially pulseless delivery of liquid from the pump. A rotating cam moves the pistons of the pumps and the control valve between their operating positions described above. The cam rotates at a constant speed around an axis that is parallel to the axis of movement of the piston pumps. A control surface is carried by and rotated by the cam in one embodiment. Grooves inscribed in the control surface establish and break fluid connections as the cam rotates.
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Beckett Carl D.
O'Hara Kevin D.
Olsen Daniel B.
Siemer Glenn E.
Soar Steven E.
Micropump, Inc.
Thorpe Timothy
Tyler Cheryl J.
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