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US 4,374,803 AGranted
Catalytic waste gas converter for combustion machines
AssigneeDegussa AG
InventorsGerhard Fratzer, Bernhard Beck
Life of this patent
Estimating the term…
Abstract
There is disclosed a catalytic waste gas converter for internal combustion engines of various types in which there is used as carrier for the catalyst a carrier matrix made of a steel screen arranged in a housing holder. There are employed special flow guides made of spirally wound steel matrices for the various flow through possibilities favorable to conversion of the waste gas to be purified.
Claims15
A catalytic waste gas converter suitable for use with an internal combustion engine comprising in combination:
- a cylindrical housing with gas inlet means at one end thereof and gas withdrawal means at the other end thereof, a first conical cover at the gas inlet end of the housing and a second conical cover at the gas withdrawal end of the housing, a holding plate in said housing, said holding plate comprising inner and outer rings connected by spokes, means for fastening said holding plate at the periphery of the outer ring at the transition between the cylindrical housing and the cover at the gas inlet end thereof, a gas supply tube passing through the cover on the gas inlet end of the housing and through the inner ring of the holding plate and extending up to the plane of the cover at the gas withdrawal end of the housing, said gas supply tube being closed at the end thereof, the section of the gas supply tube before the holding plate and within the cover on the gas inlet end of the housing having openings on the circumference and the section of the gas supply tube lying below the holding plate having perforations, a coil surrounding the perforated section of the gas supply tube and reaching in its cross section at least to the inner edge of the outer ring of the holding plate or closely thereunder, said coil being made of catalyst coated, alternating smooth and undulating layers of a high temperature and scale resistant steel screen, said coil being supported on its downstream face by flange means fastened to the cover on the gas withdrawal side of the housing;
- said coil having a perforated cylinder disposed on its periphery, and a gas withdrawal tube attached to the cover on the gas withdrawal end of the housing.
A catalytic waste gas converter suitable for use with an internal combustion engine comprising in combination:
- a cylindrical housing with gas inlet means at one end thereof and gas withdrawal means at the other end thereof, a first conical cover at the gas inlet end of the housing and a second conical cover at the gas withdrawal end of the housing, a holding plate in said housing comprising inner and outer rings connected by spokes, means for fastening said holding plate at the periphery of the outer ring at the transition between the cylindrical housing and the cover at the gas inlet end thereof, a gas supply tube passing through the cover on the gas inlet end of the housing and terminating at said holding plate and being welded or soldered to the inner ring thereof, the section of the gas supply tube before the holding plate and within the cover on the gas inlet end of the housing having openings on the circumference and said gas supply tube opening into one end of a first perforated cylinder which is closed at the other end thereof, the perforated cylinder extending up to the gas withdrawal end of the housing, a coil surrounding the first perforated cylinder and reaching in its cross section at least to the inner edge of the outer ring of the holding plate or closely thereunder, said coil being made of catalyst coated, alternating smooth and undulating layers of a high temperature and scale resistant steel screen, said coil being supported on its downstream face by flange means fastened to the cover on the gas withdrawal side of the housing, said coil having a second perforated cylinder disposed on its periphery, and a gas withdrawal tube attached to the cover on the gas withdrawal end of the housing.
Dependencies are inferred from the claim text.