F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
103/51
F04B 19/00 (2006.01) F04B 7/06 (2006.01) F04B 49/00 (2006.01)
Patent
CA 2033253
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. It also allows backflow to occur in an inflow line to the pump, thereby cleaning any filters within the inflow line or agitating a suspension from which the inflow line draws fluid. It also permits suction to be applied to an outflow line at the end of a discharge stroke, thereby preventing hanging drops or strings from forming at the discharge end of the outflow line. In addition, timing adjustment allows the manufacture of relatively inexpensive pumps in which the axes of the drive cylinder and working chamber are maintained in fixed positions relative to each other. 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.
Mcfadden Fincham
Pinkerton Dennis
LandOfFree
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