Electric heating waste gas treatment device with double-layer sleeve structure

Abstract

The invention discloses an electric heating waste gas treatment device with a double-layer sleeve structure. The device is arranged in an exhaust system of an internal combustion engine, and comprisesan inner layer sleeve, an outer layer sleeve and a metal catalyst carrier; the metal catalyst carrier is arranged in the inner layer sleeve, at least one heating honeycomb element is located in the inner layer sleeve and is arranged above the metal catalyst carrier, an insulation gap is formed between the heating honeycomb element and the metal catalyst carrier, an annular U-shaped machining groove is formed in the upper end, located on the inner side of the outer layer sleeve pipe, of the inner layer sleeve along the circumferential direction, so that the upper end part of the inner sleeve pipe is separated out of an arc ring, one end of the heating honeycomb element is electrically connected to the arc ring, and an electric conduction element is electrically connected to the outer wallof the arc ring after being insulated through the outer layer sleeve. According to the electric heating waste gas treatment device, the adverse effects of accelerated oxidation and corrosion of a contact area between the end part of an electric conductor and the honeycomb core body can be effectively reduced or avoided, and specifically, damage to an electrical sensitive part caused by high torquegenerated in the actual assembling process can be avoided.

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...

AI Technical Summary

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 conductively connected (welded or soldered) to an internal heating electrical component, where it has been proven that rotationally symmetrical structures, usually surrounded by 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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