A kind of scr system and its catalytic muffler and welding method of catalytic muffler

Abstract

The invention discloses a catalytic muffler and a welding method thereof. The catalytic muffler comprises a shell and a porous tube arranged in the inner cavity of the shell. The porous tube communicates with a transition connection plate located outside the shell. The front end cover, the front end cover is connected with the inner end wall of the housing, and the front end cover is welded to the transition connection plate; the porous tube is welded to the front end cover and / or the transition connection plate, so that the transition connection plate is optimized to be multi-point supported by the front end cover. point support, thereby greatly improving the fatigue life of the catalytic muffler. The invention also discloses an SCR system comprising the catalytic muffler.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to an SCR system and its catalytic muffler and a welding method for the catalytic muffler. Background technique [0002] The SCR system is mainly divided into three parts according to the function: the control unit, the urea dosage unit and the catalytic muffler. Among them, the urea aqueous solution and the tail gas undergo hydrolysis and pyrolysis reactions in the catalytic muffler, and the generated ammonia and tail gas undergo a catalytic reduction reaction on the carrier in the catalytic muffler, and the NO X Reduction to nitrogen, so that the diesel engine exhaust meets emission regulations. Therefore, in the SCR system, the catalytic muffler plays a vital role, and its life determines the life of the SCR system to a certain extent. At present, when the catalytic muffler is assembled, all parts are welded together in a certain order. [0003] A typical catalytic muffler and...

AI Technical Summary

Problems solved by technology

[0009] In the catalytic muffler formed by welding according to the above process, such as image 3 As shown, the transition connection plate 3' is only welded with the front end cover 8', and the two form a single point support cantilever structure. During the working process of the catalytic muffler, the load transmitted by the transition connection plate 3' is all borne by the front end cover 8', resulting in The front end cover 8' deforms greatly, and under the action of alternating loads, cracks occur, resulting in a low fatigue life of the front end cover

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