A three-way catalytic converter

Abstract

The invention discloses a three-way catalytic converter, which comprises: an exhaust gas guide assembly, which has a packing space inside and a diversion channel communicating with the packing space; a catalytic assembly, which is arranged inside the packing space; a front end cover, which can The front end of the exhaust gas guide assembly is detachably connected and communicated with the guide channel; and the rear end cover is detachably connected with the rear end of the exhaust gas guide assembly and communicated with the packing space. The invention can greatly reduce the cleaning frequency and times of the three-way catalytic converter, and does not need to completely clean the internal carrier, so it has high reusability and good durability; in addition, it can avoid the direct impact of high-temperature exhaust gas on the conventional three-way catalytic converter. Pad burn defects.

Description

technical field [0001] The invention relates to the technical field of automobile tail gas treatment, in particular to a three-way catalytic converter. Background technique [0002] The three-way catalytic converter is the most important external purification device installed in the automobile exhaust system. It can convert harmful gases such as CO, HC and NOx emitted from automobile exhaust into harmless carbon dioxide, water and nitrogen. The three-way catalytic converter is mainly composed of a shell, a liner and a carrier; the carrier is divided into two types: metal and rare earth ceramics, and the shape is honeycomb, and now the 400-mesh carrier is mainly used. The carrier is coated with a catalyst coating for oxidation and reduction reactions with harmful gases. The catalyst coating is coated with precious metal platinum (Pt), palladium (Pd) rhodium (Rh) in the form of rare earth metal oxides in a certain proportion. on a honeycomb ceramic carrier. One of platinum ...

AI Technical Summary

Problems solved by technology

[0004] 1. After the three-way catalytic converter is used for a long time, the carbon deposits and other impurities discharged from the engine will cover the surface of the three-way catalyst on the carrier, so that the precious metal cannot contact the exhaust gas and cannot achieve the catalytic effect;

[0005] 2. Carbon deposits and other impurities discharged from the engine will block the pores of the three-way catalyst, increasing the exhaust back pressure, resulting in unstable idling and poor acceleration.

[0006] However, the existing three-way catalytic converter not only has the problem of regular cleaning, but also the honeycomb carrier makes the cleaning process difficult and incomplete

In addition, the existing carrier has a one-piece cylindrical structure. When the carrier needs to be cleaned or replaced (due to partial rupture or burning), it can only be taken out as a whole for overall cleaning or replacement. The terminal still has a catalytic effect, and the function has not yet failed, so the overall replacement method directly causes a waste of resources and increases the production usage and production cost of precious metal coatings.

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