Reinforced corrugated thin metal foil strip useful in a catalytic converter core, a catalytic converter core containing said strip and an electrically heatable catalytic converter containing said core
First Claim
1. A corrugated thin metal foil strip having a longitudinally extending center line with an initial strip width and having at least one longitudinal edge folded toward the center line of the strip prior to corrugating said strip to form a folded section and a remaining portion of the strip which is unfolded, the width of the folded section being from about 5% to about 25% of the width of the remaining portion of the strip which is unfolded.
3 Assignments
0 Petitions
Accused Products
Abstract
There is provided an improved reinforced corrugated thin stainless steel strip in which either or both of the longitudinal edges are overfolded to increase the thickness and stiffness of the foil to better resist the tendency to failure in a severe hot-shake screening test. There is also provided a core and an electrically heatable catalytic converter containing the core for use in the exhaust line of an internal combustion engine.
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Citations
19 Claims
- 1. A corrugated thin metal foil strip having a longitudinally extending center line with an initial strip width and having at least one longitudinal edge folded toward the center line of the strip prior to corrugating said strip to form a folded section and a remaining portion of the strip which is unfolded, the width of the folded section being from about 5% to about 25% of the width of the remaining portion of the strip which is unfolded.
- 12. A core for an electrically heatable catalytic converter including a core member having a predetermined geometric configuration and comprising a corrugated thin metal foil strip having a predetermined length, and a predetermined width, said foil strip being overfolded prior to corrugating said strip along at least one edge to form a folded section and a remaining portion of the strip which is unfolded, the width of the folded section being from about 5% to about 25% of the width of the remaining portion of the strip which is unfolded, said corrugated foil strip being spirally wound about an electrically conducting central metal post with at least one overfolded edge on the outer end of the core, and including a retaining shell tightly surrounding the core and being electrically bonded thereto.
- 18. An electrically heatable catalytic converter for treating exhaust gas emanating from an internal combustion engine to remove pollutant materials therefrom, said converter comprising (1) an outer metallic housing having inner and outer walls, (2) an end cap adaptor at each end of said housing for adapting the configuration of the outer housing for insertion into a conventional exhaust system for said internal combustion engine, (3) an insulating liner for the inner wall of the housing, (4) a core for said converter within said insulating liner including a core member comprising a corrugated thin metal foil strip having a predetermined length and a predetermined width, the length being greater than the width, said foil strip being overfolded prior to corrugating said strip along at least one longitudinal edge to form a folded section and a remaining portion of the strip which is unfolded, the width of the folded section being from about 5% to about 25% of the width of the remaining portion of the foil strip which is unfolded, said foil strip being spirally wound about an electrically conducting central metal post with at least one overfolded edge on the outer end of the core, and including a retaining shell tightly surrounding said core and being electrically bonded thereto, (5) means for connecting said central post to one pole of a direct current voltage source, (6) means for connecting said housing to the other pole of a direct current voltage source, and (7) a direct current voltage source rated at from 12 to 108 volts.
Specification