Muffler with improved heat dissipation

Abstract

A muffler has inner and outer elongated concentric and radially spaced generally cylindrical casings having inlet and outlet ends, and providing an annular chamber therebetween. The outer casing has an inlet opening into the annular chamber adjacent the inlet end of the outer casing so that air may flow to the outer end. The inner casing has an aperture adjacent the outlet end for the air to flow from the annular chamber into the inner casing for discharge with the exhaust. This air flow through the annular chamber reduces the temperature of the outer casing from that of the inner casing. Baffles are provided in the inner casing, and insulating material may also be provided in the inner casing.

Description

BACKGROUND OF THE INVENTION [0001] This invention is related to exhaust systems, and, more particularly, to a muffler which will facilitate exhaust action and noise abatement of high velocity exhaust gas flow and which has an outer wall which has a reduced temperature. [0002] Internal combustion engines and turbines produce exhaust combustion gases and the discharged exhaust is frequently accompanied by undesirable levels of noise. The problem of muffling and evacuating such exhaust gases is well known. [0003] Moreover, the hot exhaust gas quickly heats the outer wall of the muffler to a temperature approaching that of the exhaust gas and prolonged high temperature can produce discoloration of the cosmetic finish on the outer wall. [0004] In my U.S. Pat. No. 6,510,921 granted Jan. 8, 2003, I have described an improved muffler which contains a pair of baffle elements in a construction which reduces back pressure and facilitates extraction of the exhaust from the engine. However, the ...

AI Technical Summary

Benefits of technology

[0015] Desirably, there is included heat-resistant fibrous material in the elongated inner chamber to enhance sound reduction.

Problems solved by technology

Internal combustion engines and turbines produce exhaust combustion gases and the discharged exhaust is frequently accompanied by undesirable levels of noise.

Moreover, the hot exhaust gas quickly heats the outer wall of the muffler to a temperature approaching that of the exhaust gas and prolonged high temperature can produce discoloration of the cosmetic finish on the outer wall.

However, the outer wall of the muffler reaches temperatures approaching that of the exhaust gas passing therethrough and discoloration of the cosmetic coating may occur.

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