Heating systems – Heat and power plants – Vehicle
Patent
1999-04-30
2000-12-26
Joyce, Harold
Heating systems
Heat and power plants
Vehicle
431 73, B60H 102
Patent
active
061645540
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to a pressure atomization burner for an engine-independent vehicle heater, with a fuel pump, by which liquid fuel can be fed to the atomization nozzle from a fuel line; with a blower, by which combustion air can be delivered into the interior of the combustion chamber; with an electric motor, by which both the fuel pump and the blower are driven; and with an igniting means for igniting the fuel-air mixture in the interior of the combustion chamber.
BACKGROUND OF THE INVENTION
Pressure atomization burners of the above-described type are operated according to the state of the art at one output stage, wherein the mean heat output can be varied by varying the on time. For heating up rapidly, it is necessary to design the device for a high burner output. However, only small amounts of energy are needed to keep the device warm. However, if the on time is shorter than the minimum combustion time, trouble-free operation of the burner is no longer possible. The consequence of this is combustion generating large amounts of pollutants with deposits in the flame tube or in the heater. Pressure atomization burners operated with a one-stage output for vehicle parking heaters have been known, e.g., from DE 195 34 866 A1 or DE 35 36 143 C2. If the burner is to be operated at another output, the atomization nozzle and the drive motor are replaced with correspondingly different units.
SUMMARY AND OBJECTS OF THE INVENTION
Based on the above-described state of the art, the object of the present invention is to provide a pressure atomization burner of the type described in the introduction, which makes do with a single atomizer nozzle and a single drive motor and can be operated equally efficiently and reliably in different ranges.
According to the invention, a pressure atomization burner is provided for an engine-independent vehicle heater. The burner has a fuel pump, by which liquid fuel is fed to an atomizing nozzle via a fuel line. The burner has a blower by which combustion air can be delivered into the interior of a combustion chamber. The burner has an electric motor, by which both the fuel pump and said blower are driven. An igniting means is provided for igniting the fuel-air mixture in the interior of the combustion chamber. A control device is provided for a voltage or speed control of the electric motor as well as for a pressure control of the fuel pump after the conclusion of the phase of ignition of the heater with the formation of a stable flame.
The essence of the present invention is that the pressure atomization burner of an engine-independent vehicle heater is designed with a control device for a voltage or speed control of the electric motor as well as with a pressure control of the fuel pump after the end of the phase of ignition of the heater.
The voltage or speed control of the electric motor as well as the pressure control of the fuel pump are advantageously performed in stages.
In particular, the number of voltage or speed control stages may be equal to the number of the pressure control stages of the fuel pump.
An especially simple and equally efficient and reliable variant of the present invention has two output stages of a control, namely, a low output stage and a high output stage.
Two adjustable pressure-limiting valves with a reversible solenoid valve arranged downstream in the fuel return may be arranged in parallel to one another in the fuel line between the fuel pump and the atomizing nozzle in a pressure atomization burner.
The fuel return may be connected on the suction side of the fuel pump. The pressure atomization burner is controlled in this case in a closed one-line operation.
However, the fuel return may also be led to the fuel reserve and contain a third pressure-limiting valve opening toward the suction side of the fuel pump. The pressure atomization burner is controlled in an open two-line operation in this case.
Instead of the two adjustable pressure-limiting valves and the reversible solenoid valve arranged downstream, a
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Eberspach Gunther
Gotz Dieter
Pfister Wolfgang
Schmid Hans-Jurgen
Schodt Adolf
Boles Derek S.
J. Eberspacher GmbH & Co.
Joyce Harold
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