Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1980-12-30
1983-05-10
Fuller, Benjamin R.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181245, 181258, 181272, F01N 716, F01N 718
Patent
active
043824870
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an exhaust muffler of enamelled steel sheet metal, which is composed of a plurality of structural parts, as well as to a method of producing it.
As a rule, exhaust mufflers of steel sheet metal are produced according to two methods, namely on the one hand in that a cylindrical sheath is folded or welded together lengthwise, whereupon head discs are rolled or welded onto the end faces of the sheath, into which discs gas inlet and gas outlet pipes are in turn welded. On the other hand, the production of the exhaust muffler takes place in a manner such that two mirror-inverted half shells are deep-drawn, which have a peripheral flange, on which the half shells, after they have been placed one above the other, are welded together by means of a seam welding machine.
The reverberation sound absorber of any exhaust system is subjected to corrosion from the inside by the condensate, particularly upon operation over short distances, the condensate resulting as an aspect inherent in the process upon combustion of the fuel/air mixture in the engine. Non-protected iron sheet metal quickly begins to rust and has rusted through within a short period of time, unless protected from such a corrosive attack. Enamelling the steel sheet metal is an inexpensive way of providing the iron with a heat-resistant and long-term resistant protective coating.
The above-mentioned production processes for exhaust mufflers for automobiles and the like, however, are not suited for producing enamelled mufflers because an enamelled part can substantially no longer be subsequently welded. Even though an edge can be provided on such a member, which edge is not enamelled, the temperatures required for welding this edge together with an other member nevertheless are so high that thermal stresses between the seam and the enamelled surface lead to chipping of the enamel when the mentioned parts enter into direct contact. It is not possible to weld the parts together at a spacing. Furthermore, an enamelled surface cannot be bent such that it can be folded together, such as is required in the case of the production process mentioned first at the outset.
It has for these reasons been attempted again and again to subsequently enamel the exhaust muffler produced of iron sheet metal. The inside space of the exhaust muffler has for this purpose been flooded with enamel slick, and the slick has been removed from the muffler, after a corresponding shaking and agitation operation, also under utilization of auxiliary apertures. The result could not satisfy, however, because, on the one hand, it could not be ensured that all of the inside surfaces had actually become coated with enamel and that apertures or the like, which must be provided for whirling the exhaust gas and for balancing the pressure impacts, have not become clogged with enamel and because, on the other hand, the inner parts of the muffler can in production not attain the enamelling temperature without the sheath enveloping the inner parts being burned through. Furthermore, the customary folding and weld seam connections cannot be faultlessly enamelled either.
Hence, it is the object of the invention to develop an enamelled exhaust muffler as well as a method of producing it, neither the muffler nor the method involving the above-mentioned drawbacks and making sure that all structural parts reach the required enamelling temperatures and are securely connected to one another, without there being any need to fear that not all of the inner surfaces of the muffler are coated with enamel and that apertures provided are clogged by enamel.
According to the invention, this object is accomplished in that the individual structural parts which the enamelled exhaust muffler consists of are placed together and are fused together at their surfaces of contact by the enamel.
In order to produce such an exhaust muffler, the structural parts of the muffler are coated with slick, are then put together and heated to enamelling temperature, the contacting surfaces of the structural parts t
REFERENCES:
patent: 2229526 (1941-01-01), Eric
patent: 3107748 (1963-10-01), Placek et al.
patent: 3209862 (1965-10-01), Young
patent: 3507357 (1970-04-01), Blome
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