Device for the cleaning of exhaust gases from internal...

F - Mech Eng,Light,Heat,Weapons – 01 – N

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Details

F01N 3/02 (2006.01) B03C 3/62 (2006.01) B03C 3/70 (2006.01) F01N 3/01 (2006.01) F01N 3/027 (2006.01) F01N 3/021 (2006.01)

Patent

CA 2246353

The invention relates to a device for the cleaning of exhaust gases from internal combustion engines, in particular a diesel exhaust soot filter. Said device has a discharge electrode (8), a counterelectrode (28) opposite thereto for electrical charging of the exhaust gas components, a ceramic structure (1) with a circular cross-section and ducts (20) extending therethrough in the direction of flow, and an internal electrode (5) at high voltage. This electrode is arranged on the inner cylinder wall (21) of the ceramic structure (1) and creates an electrical field at right angles to the ducts (20) passing through said ceramic structure. The soot particles are deposited and oxidised on the walls of the ducts (20), and a separation is provided to prevent flow through the hollow internal space (22) of the ceramic structure (1). To prevent the formation of conductive soot bridges between high-voltage- conducting components and earth the separation of the hollow internal space (22) of the ceramic structure (1) is an electrical insulator, preferably a ceramic stopper (4), arranged at the inlet side of the gas stream.

L'invention concerne un dispositif de purification des gaz d'échappement d'un moteur à combustion interne, en particulier un filtre à suie de diesel. Ledit dispositif comporte une électrode de décharge (8) une contre-électrode (28) opposée à celle-ci et servant à charger électriquement les composants des gaz d'échappement, un corps céramique (1) de section circulaire et des canaux (20) traversant ledit corps dans le sens d'écoulement, et une électrode interne (5) à haute tension. Cette électrode est placée sur la paroi de cylindre intérieure (21) du corps céramique (1) et crée un champ électrique perpendiculaire aux canaux (20) qui traversent ledit corps. Les particules de suie sont déposées et oxydées sur les parois des canaux (20), et une séparation sert à empêcher le passage d'un écoulement à travers l'espace (22) intérieur vide du corps céramique (1). Pour empêcher la formation de ponts de suie conducteurs entre les composants conducteurs à haute tension et la terre, la séparation de l'espace (22) intérieur vide du corps céramique (1) est un isolant électrique, de préférence un bouchon céramique (4), placé du côté de l'entrée du courant de gaz.

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