Low pressure metering fluid pump

Details Low pressure metering fluid pump Low pressure metering fluid pump

1988-10-11

1989-08-22

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361196, 361203, H01H 900

Patent

active

048601586

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.

REFERENCES:
patent: 3864608 (1975-02-01), Normile et al.
patent: 4047852 (1977-09-01), O'Connor et al.
patent: 4673127 (1987-06-01), Grant

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