Double-layer casing structure electric heating waste gas treatment device

Abstract

An electric heating exhaust gas treatment device with a double-layer casing structure is arranged in the exhaust system of an internal combustion engine, and includes an inner layer casing, an outer layer casing and a metal catalyst carrier. The inner layer casing is provided with a metal catalyst carrier, and at least one The heating honeycomb element is located in the inner sleeve and arranged above the metal catalyst carrier. There is an insulating gap between the heating honeycomb element and the metal catalyst carrier. The upper end of the inner sleeve is located on the inner side of the outer sleeve and a The annular U-shaped processing groove separates the upper end of the inner casing into a circular arc, one end of the heating honeycomb element is electrically connected to the circular arc, and a conductive element is electrically connected to the circular arc after penetrating through the outer sleeve. The outer wall of the arc ring; thus, the present invention can effectively reduce or avoid the adverse effects of accelerated oxidation and corrosion in the contact area between the end of the electric conductor and the honeycomb core body, and especially avoid the high torque generated during the actual assembly process so that Damage caused by electrically sensitive parts.

Description

technical field [0001] The invention relates to the technical field of emission reduction of automobile tail gas pollutants, in particular to an electric heating waste gas treatment device with a double-layer casing structure. Background technique [0002] In the exhaust system of the internal combustion engine, an electric heating device that can play a catalytic role in advance is installed at the front end of the catalyst carrier. It can ignite the catalytic reaction through the flowing exhaust gas through radiant heat, especially for the rapid and effective heating of the diesel internal combustion engine. The accumulated carbon black particles are thereby burned off. [0003] The technical construction of this type of electric heating device is to use and only use a single sleeve, and to apply a circuitous current line at its end through equidistant gaps. One end of the current line is in contact with the inner wall of the sleeve, and the other end is in contact with an...

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Problems solved by technology

[0005] Here, the known situation is: the prior art is usually an electric heating device with a single current circuit. In practical applications, this single current circuit is often limited by the diameter of the exhaust pipe or the vehicle-mounted power. During the design process, Based on the starting point of "the follow-up catalyst carrier should be heated as uniformly as possible", a circuit scheme of double current lines or multiple current lines appears. Obviously, this multi-path current scheme requires more electrical conductor joints and more The external circuit, which is unfavorable in assembly or later maintenance

[0006] As a rule, the electrical conductor is electrically conductively connected (welded or soldered) to an internally heated electrical component, where it has been proven that rotationally symmetrical structures surrounding the electrical conductor, usually with a ceramic insulating layer, may be used as electrical conductors Torques that, until now, could be greater than those generated by this insulation during conventional limited assembly, especially for subsequent maintenance or other types of repair work that require disassembly of electrical connections What's more, these situations will have a great possibility to cause damage to heating electrical components or electrically insulating ceramic bodies, thus bringing potential safety hazards

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