Combustion – Burner having electrical heater or igniter – Adjacent exposed liquid fuel surface on fuel support
Patent
1996-07-02
1999-11-30
Price, Carl D.
Combustion
Burner having electrical heater or igniter
Adjacent exposed liquid fuel surface on fuel support
431350, 431352, 431353, 2989002, F23D 300
Patent
active
059931973
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to the combustion chamber of a burner for a vehicle heater or for the thermal regeneration of an exhaust gas particle filter, which has a front limiting wall, a circumferential limiting wall, a socket for accommodating a glow plug, and a pipe for supplying combustion air, which pipe projects from the front limiting wall into the combustion chamber and has at least combustion air outlets through the pipe wall.
BACKGROUND OF THE INVENTION
Such combustion chambers of burners for these applications have been known. The prior-art combustion chambers were fitted together from punched and subsequently bent sheet metal parts, which involves considerable expenses for connecting the individual parts, normally by welding or soldering. These connection techniques usually lead to a thermal warping of the combustion chamber, so that the combustion chamber must be straightened before installation in the burner.
SUMMARY AND OBJECTS OF THE INVENTION
The basic object of the present invention is to make available a combustion chamber that can be manufactured efficiently.
To accomplish this object, the combustion chamber is designed as a one-piece precision casting component with the front limiting wall, with the circumferential limiting wall, with the glow plug socket, and with or without the air supply pipe.
Precision casting is a prior-art manufacturing process. However, the view that only the above-mentioned "sheet metal design" is suitable for manufacturing combustion chambers from suitable materials and with the desired thin wall thickness of the components, is a view that is widespread in the technical field of the present invention, and has stood in the way of designing a combustion chamber as a precision casting component. The inventors of the subject of the present invention have disregarded these concerns and have found that combustion chambers with reasonably thin wall thicknesses can be manufactured from a suitable material according to the precision casting process, contrary to expectations. The accuracy of manufacture is better without straightening operations than in the case of the sheet metal design. Only minimal finishing operations, e.g., the preparation of a fuel supply hole, are necessary at most.
The present invention offers the possibility of pursuing the precision casting integral design of the combustion chamber very far or less far. If the air supply pipe is included in the integral design, an especially good effect is achieved in terms of efficiency. However, advantages are offered over the prior-art design even by a precision casting component into which the air supply pipe, which itself is manufactured either from bent sheet metal or according to the precision casting process, is inserted subsequently. It will become clear from the further description that in a variant of the present invention, other functional components of the combustion chamber can also be included in the precision casting integral design.
A typical representative of the precision casting technology, which is preferred in the present invention, is the prior-art lost-wax process. A manufacturing mold is first prepared in this process for a wax pattern, which has the shape of the precision casting component to be ultimately prepared. A relatively large number of such wax patterns, connected to a common sprue, are then incorporated in a mold material, which frequently consists of ceramic particles with a binder. The wax patterns melt out during the subsequent casting, and the mold cavities formed as a result are filled with molten metal. The mold material is destroyed to remove the precision casting components.
Scaling-resistant and high-temperature steel alloys, especially steel alloys from the group of the stainless special steels, are preferably used as the material for the precision casting component according to the present invention.
The glow plug socket is preferably aligned at least essentially in parallel to the direction of the longitudinal extension of the co
REFERENCES:
patent: 1227239 (1917-03-01), Best
patent: 1373144 (1921-03-01), Mummery
patent: 2582890 (1952-01-01), Stamm
patent: 4538413 (1985-09-01), Shinzawa
Alber Andreas
Blaschke Walter
Brenner Dirk
Humburg Michael
Pfister Wolfgang
J. Eberspacher GmbH & Co.
Price Carl D.
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