Heating systems – Heat and power plants – Vehicle
Patent
1990-03-02
1991-09-24
Yuen, Henry C.
Heating systems
Heat and power plants
Vehicle
432222, B60H 102
Patent
active
050507966
ABSTRACT:
A heater, in particular a motor vehicle heater operated with liquid fuel in which the fuel to be fed to the burner of the heater is preheated using the thermal energy of the combustion gases in the discharge area of the heater to guarantee reliable operation of the heater even at low temperatures, and to prevent paraffin separations, especially with diesel fuel in advance of filter devices in the fuel supply of the burner. For this purpose, a fuel preheating pipe section is provided that can be made in the form of a spiral-shaped pipe loop and that is placed in the flow of combustion gases, which have passed through the heat exchanger of the heater. Since the fuel is warmed in the fuel flow pipe before passage through the filter device, clogging of the filter device is avoided. In accordance with various embodiments the fuel preheating pipe section can be placed in an exhaust gas collecting chamber of the heater or in an exhaust gas discharge connection. Another embodiment feature includes the provision of a second heat exchanger that warms the fuel to being fed to the internal combustion engine using the liquid coolant that was previously warmed in the motor vehicle heater and which also serves as the heat exchange medium for the heat exchanger of the heater.
REFERENCES:
patent: 2352112 (1944-07-01), LaSha et al.
patent: 3400889 (1968-09-01), Hoyer
patent: 3861590 (1975-01-01), Kofink
patent: 3995991 (1976-12-01), Wilkinson
patent: 4105158 (1978-08-01), Hasebe et al.
patent: 4192457 (1980-03-01), Easterly
patent: 4385726 (1983-05-01), Bernauer et al.
patent: 4828170 (1989-05-01), Takman
patent: 4883226 (1989-11-01), Tomita et al.
Raethel Dieter
Renovanz Wilfried
Schumacher Christof
Umlauf Bernhard
Webasto AG Fahrzeugtechnik
Yuen Henry C.
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