Combustion – Burner having electrical heater or igniter – Adjacent exposed liquid fuel surface on fuel support
Patent
1995-12-15
1997-02-25
Dority, Carroll B.
Combustion
Burner having electrical heater or igniter
Adjacent exposed liquid fuel surface on fuel support
237 123C, F23Q 708
Patent
active
056054530
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to a burner of a vehicle heater and in particular to a burner where liquid fuel is evaporated by a porous lining in a combustion chamber and a glow plug ignites the fuel.
BACKGROUND OF THE INVENTION
The ignition of the fuel in a combustion chamber causes very harsh and adverse conditions which can cause a glow plug to deteriorate. Also byproducts of combustion can accumulate on a glow plug causing fouling and blocking the glow plug from igniting the fuel. In the combustion chamber conditions progress from being almost completely full of liquid fuel, to varying fuel air mixtures, to partial combustion, to full combustion and then to full exhaust. The position of the glow plug is therefore of very great significance for ignition in such burners to avoid deterioration and fouling of the glow plug and still ignite the fuel or fuel-air mixture. The position of the glow plug is also of very great significance for an optimal ignition process in such burners. Previously the glow plug was arranged in a socket projecting radially away from the circumferential wall of the combustion chamber, or it was positioned behind the bottom of the combustion chamber.
SUMMARY AND OBJECTS OF THE INVENTION
The basic object of the present invention is to design the burner with regard to the arrangement of the glow plug such that favorable conditions will be achieved for the ignition, and the glow plug is accommodated in an especially space-saving manner.
To accomplish this object, the burner is characterized according to the present invention in that located essentially in a tangential plane of the circumferential wall of the combustion chamber.
A large part of the glow area of the glow plug is brought into the favorable vicinity of the interior space of the combustion chamber due to the arrangement of the glow plug. At the same time, especially little space is needed in the environment of the combustion chamber.
The location and the arrangement of the glow plug can also be expressed such that its plug longitudinal axis extends essentially in the tangential direction in relation to the circumferential wall of the combustion chamber, and this should not mean that the longitudinal axis of the glow plug absolutely has to lie in a plane which extends at right angles to the longitudinal axis of the combustion chamber. The longitudinal axis of the glow plug may assume any position in a tangential plane of the circumferential wall of the combustion chamber, and it may even extend in parallel to the longitudinal axis of the combustion chamber in the limiting case, which is even a favorable one. The mounting plane in which the longitudinal axis of the glow plug is located may be shifted somewhat to the inside of the combustion chamber or away from the interior of the combustion chamber in relation to the plane which is mathematically the tangential plane of the circumferential wall of the combustion chamber, as will be shown in the exemplary embodiments described below. The glow area of the glow plug is preferably arranged in an outer side chamber of the combustion chamber, and the side chamber is in connection with the combustion chamber via an opening. The glow plug is thus protected from adverse effects caused by the conditions prevailing in the combustion chamber, especially in terms of exposure to flame and dirt accumulation.
The opening preferably passes through the lining of the combustion chamber, and it is especially favorable for the lining to have a surface area facing the side chamber next to the opening or around the opening. These measures ensure the best conditions for the evaporation of fuel in the immediate vicinity of the glow plug and the formation of a ready-to-ignite fuel-air mixture there.
As an alternative, it is preferable to arrange the glow area of the glow plug in a recessed space of the lining, which is in connection with the combustion chamber via an opening. This also ensures favorable conditions for ignition, on the one hand, and sealing of the glow
REFERENCES:
patent: 5197871 (1993-03-01), Yamamoto et al.
Kenner Erich
Langen Herbert
Reiser Peter
Schaffert Wolfgang
Dority Carroll B.
J. Eberspacher
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