Catalytic muffler for purifying the exhaust gases of an internal combustion engine
AssigneeInstitut Francais du Petrole
InventorMichel Prigent
Life of this patent
Estimating the term…
Abstract
An elongate catalytic muffler of the radial flow type for purifying the exhaust gases of an internal combustion engine, comprises a tubular casing having a gas inlet at one end and a gas outlet at the other end. Two co-axial substantially parallel frustra-conical grids of decreasing cross-section from the inlet end to the outlet end of the muffler define, with cup-like end walls, a catalyst chamber compression means is provided for axially displacing one of said end walls towards the other, so as to compress the catalyst mass in said chamber, and with said compression means being protected by tight separating means from the action of the exhaust gases treated in the muffler.
Claims9
A catalytic muffler for purifying the exhaust gases of an internal combustion engine, comprising an elongate body having gas admission and gas exhaust chambers provided with respective ports located substantially at the respective two ends of the muffler;
- first and second laterally arranged perforate walls spaced from each other in said body to define an annular elongate space adapted for containing a particulate purification catalyst therein, said first and second perforate walls separating said gas admission and exhaust chambers, and at least said second perforate wall being slidably mounted in the longitudinal direction of the muffler within a sleeve passing through the wall of said tubular body;
- and catalyst compressing means associated with said slidable second perforate wall for acting thereon to reduce the volume of said annular space for compressing particulate catalyst contained therein, and wherein said catalyst compressing means is located outside said elongate body, and separated from said slidable second perforate wall by thermal insulating means, with said thermal insulating means being interposed between said catalyst compressing means and the bottom portion of said second lateral wall.
A catalytic muffler for purifying the exhaust gases of an internal combustion engine, comprising an elongate body having gas admission and gas exhaust chambers provided with respective ports located substantially at the respective two ends of the muffler;
- first and second laterally arranged perforate walls spaced from each other in said body to define an annular elongate space adapted for containing a particulate purification catalyst therein, said first and second perforate walls separating said gas admission and exhaust chambers, with at least said second perforate wall being slidably mounted in the longitudinal direction of the muffler within a sleeve passing through the wall of said tubular body, said laterally arranged walls comprising a frusto-conical internal wall having at its end of smallest diameter, a tubular end portion on which a bottom portion of the second lateral wall is slidably mounted, and at its end opposite to said bottom portion, the second lateral wall is slidably mounted on a cup surrounding said internal wall;
- and catalyst compressing means associated with said slidable second perforate wall for acting thereon to reduce the volume of said annular space for compressing said particulate catalyst contained therein, and wherein said catalyst compressing means is housed inside said sleeve and located outside said body with thermal insulating means interposed between said catalyst compressing means and the bottom portion of said second lateral wall.
Dependencies are inferred from the claim text.