Combustion – Burner having electrical heater or igniter – Adjacent exposed liquid fuel surface on fuel support
Patent
1997-11-05
1999-08-17
Dority, Carroll B.
Combustion
Burner having electrical heater or igniter
Adjacent exposed liquid fuel surface on fuel support
431263, 237 123C, F23Q 708
Patent
active
059384298
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to a device for supplying and igniting especially gasoline as a fuel for a vaporizing burner of a heater, especially a vehicle heater, in which fuel evaporated from a porous body and mixed with combustion air is burned in a combustion chamber of the heater after an initial ignition by a pin-type glow plug.
BACKGROUND OF THE INVENTION
Such a device has been known from, e.g., DE 3708745 C1. The combustion air is fed in in a complicated manner in that prior-art device; it is fed to the porous body surrounding the glow electrode from the same end as is the fuel needed.
SUMMARY AND OBJECTS OF THE INVENTION
It is an object of the present invention to address the problem of bringing about an improvement and to generally provide a more reliably operating device of the type of a simple design as discussed above.
According to the invention, a device is provided for supplying and igniting especially gasoline as a fuel for a vaporizing burner of a heater, especially a vehicle heater. The fuel is evaporated from a porous body and mixed with combustion air and is burned in a combustion chamber of the heater after an initial ignition by a pin-type glow plug. The pin-type glow plug is mounted in a socket arranged insulated from the combustion chamber and is radially surrounded by a tubular porous body. The porous body extends into the combustion chamber beyond the free end of the pin-type glow plug. Combustion air is fed radially in the area of the free end of the pin-type glow plug. Fuel is fed at the opposite end, likewise radially.
The tubular porous body preferably contacts a porous combustion chamber lining which is present at least in the area in which the porous body opens into the combustion chamber wall. The combustion chamber may be designed tubularly with a lateral pocket shaped in it axially in parallel for accommodating the pin-type glow plug. The porous body preferably surrounds the pin-type glow plug and contacts the wall of the pocket in a heat-transferring manner. The combustion chamber lining may have a closed ring shape covering the pocket and may have an opening in the area of the free end of the porous body surrounding the pin-type glow plug.
The said socket can be plugged into a hole of a bottom part of the heater that can be attached by means of a flange and is secured axially via a said clamp. The clamp may be placed radially into a groove of the socket and may be screwed to the bottom part at an adjacent point. The socket may be secured against rotation by being in positive-locking contact with a projection of the bottom part. The socket may be formed of a material having poor thermal conductivity and/or is separated from the bottom part by an insulating material.
The present invention is based on the idea of mounting the porous body together with the pin-type glow plug surrounded by same in a common socket and of fixing this socket in an opening of a heater wall, which is insulated from the bottom of a tubular combustion chamber. In particular, no complicated feed means is needed to feed the combustion air to the porous body. This feed means is formed, instead, by a channel, which is shaped openly in an inner wall of the heater and opens into the opening for the part receiving the porous body. This channel is closed to form an air feed by a wall of the combustion chamber of the heater, which is laid on its open side. The fuel supply into the porous body takes place at a point located at a distance from the combustion chamber in order to prevent an excessively high temperature, which causes an immediate evaporation of the fuel fed in, from occurring at that point. Fuel storage and distribution undisturbed by the combustion air flowing in is achieved within the porous body due to the spatially separated supply of the fuel and of the combustion air at opposite ends of the tubular porous body. Such a uniform distribution or storage of fuel in a larger area of the tubular porous body compensates inequalities in fuel supply. These inequalitie
REFERENCES:
patent: 5056501 (1991-10-01), Ida
Dority Carroll B.
J. Eberspacher GmbH & Co.
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