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US 5,053,062 AGranted
Ceramic foam prefilter for diesel exhaust filter system
AssigneeDonaldson Company, Inc.
InventorsMarty A. Barris, Wayne M. Wagner
Life of this patent
Estimating the term…
Abstract
A filter device for trapping particulates for diesel engine exhaust gases including an electrical heating element for regenerating the primary monolithic ceramic filter and a porous cermaic disc pre-filter between the heating element and the primary filter to provide a practical secondary source of heat when particulates on it combust during regeneration.
Claims3
Filter apparatus for reducing particulates from exhaust gases from an engine, comprising:
- a housing have a chamber with an inlet, an outlet, and a fluid flow path leading from said inlet upstream to said outlet downstream;
- means, within said chamber along said fluid flow path, for filtering the particulates from said exhaust gases, said filtering means including a ceramic filter element having an inlet end;
- means for regenerating said ceramic filter element, said regenerating means including means for heating said ceramic filter element, said heating means having a heating element supported by said housing;
- a porous ceramic disc pre-filter between said heating element and said ceramic filter element, said disc pre-filter being spaced from said heating element, said disc pre-filter being supported by said housing;
- a porous ceramic disc reradiator between said inlet to said chamber and said heating element;
- said regenerating means including means for blowing air through said heating element and said ceramic disc pre-filter toward said ceramic filter element to initiate and maintain regenerative combustion;
- and
- means for controlling said regenerating means.
5 more elements
Filter apparatus for reducing particulates from exhaust gases from an engine, comprising:
- a housing having a chamber with an inlet, an outlet, and a fluid flow path leading from said inlet upstream to said outlet downstream;
- means, within said chamber along said fluid flow path, for filtering the particulates from said exhaust gases, said filtering means including a ceramic filter element having an inlet end;
- means for regenerating said ceramic filter element, said regenerating means including means for heating said ceramic filter element, said heating means having a heating element supported by said housing;
- a porous ceramic disc pre-filter between said heating element and said ceramic filter element, said disc pre-filter being spaced from said heating element, said pre-filter having opposite sides covered with a coating have an emissivity greater than 80%, said disc pre-filter being supported by said housing;
- said regenerating means including means for blowing air through said heating element and said ceramic disc pre-filter toward said ceramic filter element to initiate and maintain regenerative combustion;
- and
- means for controlling said regenerating means.
4 more elements
Dependencies are inferred from the claim text.