초록 ▼

A ceramic honeycomb catalytic converter having a novel canning structure capable of stably retaining a thin-walled ceramic honeycomb catalyst within a metal casing for a long period. A retainer member in the form of a ceramic fiber mat is disposed between an inner peripheral surface of the casing an

A ceramic honeycomb catalytic converter having a novel canning structure capable of stably retaining a thin-walled ceramic honeycomb catalyst within a metal casing for a long period. A retainer member in the form of a ceramic fiber mat is disposed between an inner peripheral surface of the casing and an outer peripheral surface of the honeycomb catalyst, in a compressed state to generate a surface pressure for retaining the honeycomb catalyst in place. The ceramic fiber mat is composed of heat resistant and non-intumescent ceramic fibers, and has a compression characteristic which is substantially free from a significant increase or decrease over an operative temperature range of the catalytic converter. The casing may be provided with at least one locking member for locking the ceramic fiber mat in a flow direction of exhaust gas passed through the honeycomb catalyst.

대표청구항 ▼

[ We claim:] [1.] A ceramic honeycomb catalytic converter comprising: a metal casing; a ceramic honeycomb catalyst accommodated in said casing; and a retainer member comprising a ceramic fiber mat disposed in a compressed state between an outer surface of the honeycomb catalyst and an inner surface

[ We claim:] [1.] A ceramic honeycomb catalytic converter comprising: a metal casing; a ceramic honeycomb catalyst accommodated in said casing; and a retainer member comprising a ceramic fiber mat disposed in a compressed state between an outer surface of the honeycomb catalyst and an inner surface of the casing, thereby generating a surface pressure for retaining said honeycomb catalyst in place within said casing; wherein said ceramic fiber mat comprises heat resistant and non-intumescent ceramic fibers and has a compression characteristic which is substantially free from increase or decrease over an operative temperature range of the catalytic converter, and the compression characteristic of said ceramic fiber mat is defined by the ceramic fiber mat maintaining a surface pressure of not less than 1 kgf/cm.sup.2 at 1000.degree. C. after being subjected to an initial surface pressure of 2 kgf/cm.sup.2 at room temperature and further wherein said casing is provided with at least one locking member for locking said ceramic fiber mat in a flow direction of exhaust gas passed through the honeycomb catalyst, said at least one locking member maintaining said ceramic fiber mat in a compressed state in which the mat is compressed in the exhaust gas flow direction by a compression amount of no less than 2 mm per a unit length of 100 mm of the honeycomb catalyst.