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US 4,392,810 AGranted
Oil burner
AssigneeEner-Tech Heating Systems Inc.
InventorsJohn D. Bears, Kenneth R. D. Emery
Life of this patent
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AssigneeEner-Tech Heating Systems Inc.
InventorsJohn D. Bears, Kenneth R. D. Emery
Estimating the term…
An oil feed system for an oil burner is disclosed. The feed system includes an oil preheater through which the oil is pumped to ensure that the oil fed to the burner nozzle is warm enough to ignite easily and completely. A purge line is provided to recirculate the standing oil in the supply line which leads to the burner nozzle back through the heater so that on start up cold oil is not sprayed from the nozzle. A solenoid valve in the purge line opens for a predetermined time initially during which oil is recirculated. It is not necessary to close off the burner nozzle during this period because the nozzle presents a considerably higher resistance to the oil than the purge line which is connected through the solenoid valve to the suction side of the feed pump with the result that the cold oil flows directly to the purge line.
An oil burner feed system comprising first pump means connected in a line between an oil storage tank and an inlet of an oil heater, an oil supply line having an inlet connected to an outlet of the oil heater and an outlet connected to a burner nozzle, a purge line having an inlet adjacent the point of connection between the nozzle and the oil supply line and in constant open communication with both the nozzle and the outlet of the oil supply line, second pump means connected in the purge line and an inlet of the oil heater, valve means in the purge line and control circuitry arranged to open the valve means on start-up of the feed system for a predetermined time interval whereby during the predetermined time interval oil is circulated through the oil supply line from the oil heater and through the purge line back to the heater.
Dependencies are inferred from the claim text.