| 摘要 |
PURPOSE: To provide a small-sized, inexpensive particulate trap for a diesel engine satisfying all the characteristics, particulate collecting performance, pressure loss due to the collection, regenerating performance, and durability. CONSTITUTION: Nonwoven fabric of heat resistant metal fiber is used as a filter medium, and metal reducing taper cylindrical filters 2-7 made of the filter medium are concentrically arranged so that the taper directions can be alternately opposite. In the cylindrical filters 2-7, a small diameter side end part of each filter is connected to a large diameter side end part one inside thereof to alternately make clearances between the filters come to a dead end on the inlet and the outlet sides of waste gas. The filter element 1 thus constituted is fitted in a metal container installed in midway of a discharge system to constitute a particulate trap. A metal three-dimensional net-shaped perforated body having air permeability is fitted to the filter medium or on one side or both sides thereof, and a catalyst is deposited on the perforated body, allowing it to be also used as a catalytic converter. |
