Electric heating catalyst

摘要

An object of the invention is to control the penetration of condensed water into an insulation member or a heater element in an electric heating catalyst (EHC). The EHC according to the invention includes a heater element that generates heat by supply of electric current to heat a catalyst, a casing that houses the heater element, an insulation member provided between the heater element and the casing to provide electric insulation, and an electrode connected to the heater element through an electrode chamber, which is a space located between the inner wall surface of the casing and the outer circumferential surface of the heater element. The EHC is further provided with a bypass passage, one end of which is connected to a bottom part of the casing at a position upstream of the upstream end face of the insulation member. The bypass passage bypasses the insulation member.

主权项

1. An electric heating catalyst comprising:
a heater element that generates heat by supply of electric current, thereby heating a catalyst; a casing that houses said heater element; an insulation member that is provided between said heater element and said casing to support said heater element and to provide electric insulation; an electrode that is connected to said heater element through an electrode chamber having a side wall formed by said insulation member to supply electricity to said heater element, the electrode chamber being a space located between an inner wall surface of said casing and an outer circumferential surface of said heater element; a bypass passage, one end of which is connected to a bottom part of said casing at a position upstream of an upstream end face of said insulation member, and which is arranged to bypass said insulation member; and a water-absorbing member with which said bypass passage is filled.