Electric heating – Heating devices – Combined with diverse-type art device
Patent
1979-11-15
1982-08-17
Paschall, M. H.
Electric heating
Heating devices
Combined with diverse-type art device
219205, 219202, 219497, 219303, 123549, 123557, 123179G, B60L 102, H05B 102
Patent
active
043451411
ABSTRACT:
A heater assembly including an electronic control circuit for preheating fuel prior to carburetion in an internal combustion engine is disclosed. Fuel entering the carburetor is heated and maintained at an elevated temperature in a preferred range of about 110.degree. F. to 140.degree. F. by an electrically energized, resistance heating element. The preheater includes a coil of copper tubing through which the fuel is conducted and which is wound about the resistance heating element for indirect heat transfer to the moving mass of fuel. A sensor is interposed in the fuel line downstream of the coiled section and includes a housing in which a temperature probe is received and in which preheated fuel is accumulated prior to being discharged into the carburetor. The resistance heating element is thermally coupled to the sensor housing whereby heat is transferred indirectly to the fuel through the spiral delivery line segment and then through the walls of the sensor housing to the enclosed fuel. According to a preferred embodiment, the volume of the sensor housing chamber is substantially greater than the volume of the spiral delivery line segment, and the mass of the sensor housing is substantially greater than the mass of the spiral delivery line segment. The resistance heating element is energized when the temperature of the fuel in the sensor housing falls below a predetermined threshold temperature, and is de-energized when the fuel temperature rises above the threshold level. This threshold level is detected by comparing an analog temperature signal with a reference signal in a voltage comparator.
REFERENCES:
patent: 3817233 (1974-06-01), Kihn
patent: 3866587 (1975-02-01), Knapp
patent: 3999525 (1976-12-01), Stumpp et al.
patent: 4015567 (1977-04-01), Zabenskie
patent: 4091265 (1978-05-01), Richards et al.
patent: 4167663 (1979-09-01), Granzow, Jr. et al.
patent: 4180036 (1979-12-01), Wolf
Griggs Dennis T.
Paschall M. H.
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