Pumps – Motor driven – Electric or magnetic motor
Patent
1988-10-11
1989-05-23
Stout, Donald E.
Pumps
Motor driven
Electric or magnetic motor
92 85R, 92240, 92245, 318484, 361196, 361163, 361165, F04B 1704, F04B 3504
Patent
active
048325830
ABSTRACT:
A low pressure metering pump having a hollow piston reciprocated in a cylindrical guide by a solenoid coil. A pair of check valves provide for unidirectional fluid flow through the cylindrical guide in response to the reciprocation of the piston. A seal attached to the piston prohibits a fluid backflow between the external surface of the piston and the internal surface of the cylindrical guide. A bumper seal at the output end of the piston prevents fluid flow through the cylindrical guide when the solenoid coil is de-energized. A control circuit periodically energizes the solenoid coil at a frequency determined by a variable resistance responsive to predetermined operational parameters. In a preferred embodiment, the metering pump is a fuel control element for a heater and the variable resistance is a thermistor or similar type of temperature sensitive resistance, which controls the rate at which fuel is delivered to the heater.
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Facet Enterprises Inc.
Ignatowski James R.
Stout Donald E.
VanOphem Remy J.
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