Method and apparatus for filtering engine exhaust

Details Method and apparatus for filtering engine exhaust Method and apparatus for filtering engine exhaust

F - Mech Eng,Light,Heat,Weapons

01

N

F01N 3/02 (2006.01) B01D 46/24 (2006.01) B01D 46/42 (2006.01) F01N 3/021 (2006.01)

Patent

CA 2141426

2141426 9403712 PCTABS00030 A filtering apparatus (12) includes a filter cartridge (28) which may be replaced or cleaned and reused. The filter apparatus also includes a heat exchanger (62) which receives cooling air to cool the exhaust prior to filtering. The cooled exhaust does not pose combustion problems for soot or the filter material in the cartridge (28). In addition to cooling the exhaust, a temperature-sensitive valve (36) opens and closes to prevent excessively hot exhaust gas from reaching the filter cartridge (28). The valve (36) includes bi-metal discs (52) which bow outward when the temperature increases and flatten when the temperature decreases. The discs engage a cover to an orifice and slide axially to open and close the valve (36). The apparatus also may include a back pressure valve (72) which will open when the exhaust flow is backed up to prevent damage to the engine.

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