Combustion – Flame holder having protective flame enclosing or flame...
Patent
1997-06-16
1999-09-07
Lazarus, Ira S.
Combustion
Flame holder having protective flame enclosing or flame...
431328, 431338, 431248, 431260, 431353, 126 91A, 126116R, 126 95, 237 123C, 237 32, F23D 1446, F24C 300, B60H 102
Patent
active
059477172
DESCRIPTION:
BRIEF SUMMARY
The present invention pertains to a vaporizing chamber for a heater operated with liquid fuel, especially a vehicle heater, according to the preamble of patent claim 1.
The emission levels of the waste gas of the combustion chamber are poor and disturbing combustion-related noises are generated due to the circumferential, punctiform admission of the fuel into the fuel-air mixing space of the combustion chamber. This equally applies to the horizontal and vertical operating positions of the combustion chamber, and in the case of a horizontal operating position, the fuel is usually admitted in an area that is not located under a horizontal plane extending through the axis of the combustion chamber. The point of fuel admission is always vertically at the top in the case of combustion chambers arranged vertically.
The object of the present invention is to eliminate the above-described drawbacks. This object is accomplished by a design of the combustion chamber according to the characterizing features of patent claim 1.
Advantageous embodiments are the subject of the subclaims.
The present invention is based on the idea of improving the combustion and consequently the emission and noise behavior of a heater equipped with a combustion chamber of this class by a clever design and guidance of the combustion chamber flame into the combustion chamber flame tube. Experiments carried out within the framework of the present invention revealed that various eccentric positions of a flame orifice opening of equal area lead to considerably different emission and noise levels. The most favorable extent of eccentric arrangement of the opening and its position on the circumference can be readily determined experimentally for a certain combustion chamber configuration of this class.
Different eccentricities may be optimal depending on whether the operating position of the combustion chamber is vertical or horizontal and whether the fuel is admitted in the zenith or at the axial height of the combustion chamber in the case of a horizontal chamber, or whether the fuel is admitted into a vertical chamber. This also applies to the circumferential position of the center of eccentricity.
If the same combustion chamber is intended for vertical and horizontal installation and for different levels of the point of fuel admission in the case of horizontal installation, the extent of the eccentricity and the position on the circumference from the center of the eccentricity, which are optimal for predetermined, different operating positions, can be determined as a compromise by simple experiments.
One exemplary embodiment of the present invention is shown in the drawings.
In the drawings,
FIG. 1 shows a longitudinal section through a combustion chamber along line I--I in FIG. 2, and
FIG. 2 shows a view of the combustion chamber according to arrow II in FIG. 1.
The combustion chamber comprises a fuel-air-mixing and ignition space area 1 and a flame tube 2 joining downstream of the ignited mixture.
The area 1 is formed by an outer tube 3 and an inner tube 4 located concentrically in same, as well as by a flame orifice 5, by which the flame tube 2 is connected to the area 1.
The annular space located between the outer tube 3 and the inner tube 4 is closed at the end located opposite the flame orifice 5. The inner wall of the outer tube 3 is lined with a porous, absorbent body 6. Liquid fuel, e.g., diesel fuel, is admitted into the said absorbent body 6 at a point of admission 7 indicated by a dash-dotted circle. The ignition at the start of the burner takes place in the area of this point of admission.
The combustion air is fed into the inner tube 4 through the open end of the said inner tube 4 that is located opposite the flame orifice 5. The air flows into the inner tube 4 in a swirling flow. The inner tube 4 is provided with a baffle plate 8 at its end facing the flame orifice. Directly adjoining the said baffle plate 8, radially open, axial slots 9, which extend over about one third of the overall length of the inner tube 4, are located in
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Humburg Michael
Steiner Peter
Cocks Josiah
J. Eberspacher GmbH & Co.
Lazarus Ira S.
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