High temperature gas filtering device

An internal combustion engine exhaust gas filtering device comprising

• an elongated cylindrical casing formed of sheet metal, the casing having end closures and longitudinal internal surfaces,
• exhaust gas inlet means associated with one end closure and treated gas outlet means associated with the other end closure,
• a replaceable elongated filter means for reception within the casing, the filter means having porous external end surfaces and porous longitudinal external surfaces and being formed of a plurality of concentric layers of porous pulverulent material held between porous layers of fibrous filter material, whereby the filter means is gas permeable from end to end and radially from the longitudinal external surfaces thereof inwardly,
• a spacing means formed of rigid sheet material, refractory relative to the temperature and corrosive characteristics of the exhaust gases, disposed in contiguous relation to the longitudinal internal surfaces of the casing for holding the filter means within the casing with the porous longitudinal external surfaces of the filter means in contact with the spacing means but spaced from the longigudinal internal surfaces of the casing, and
• means spacing one end of the filter means from the gas inlet means of the casing to form an entering gas distributing plenum,
• the spacing means including wall surfaces extending longitudinally of the casing and in spaced relation to the internal surfaces of the casing, the spacing means wall surfaces forming a plurality of passages for longitudinal flow of the gases, the passages being in communication with the gas distributing plenum and open to the porous longitudinal external surfaces of the filter means in the direction of the length dimension thereof but closed toward the internal surfaces of the casing, whereby the exhaust gas to be filtered can enter the filter means longitudinally from the gas distributing plenum and can enter the filter cartridge radially from the passages.