Phase adjustable metering pump, and method of adjusting the flow rate thereof
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United States of America Patent
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-
Sep 3, 1991
Grant Date -
N/A
app pub date -
May 16, 1990
filing date -
May 16, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A valveless, positive displacement metering pump is provided by the invention. Such a pump includes a housing, a working chamber within the housing, a piston within the working chamber, the piston including a duct defined by a portion of its outer surface, one or more inflow ports communicating with the working chamber, one or more outflow ports communicating with the working chamber, and a drive cylinder for simultaneously rotating the piston and causing it to move in back and forth strokes within the working chamber. The housing is rotatable with respect to the piston to adjust the timing of the fluid communication between the duct and the inflow and outflow ports, respectively. Such adjustments in timing allow the flow rate of the pump to be fine tuned, and allow each port to experience a partial suction as well as a partial discharge. A method for adjusting the flow rate of a valveless, positive displacement metering pump is also provided which includes adjusting the phases at which the piston duct communicates with each of the ports of the pump.
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