Engine catalytic converter with novel expansion pipe flow guiding device and sepiolite carrier

Abstract

The invention relates to an engine catalytic converter with a novel expansion pipe flow guiding device and a sepiolite carrier. The engine catalytic converter is composed of a flange, an expansion pipe, the flow guiding device, a fixing rib plate, a shell, a vibration reduction layer, the sepiolite carrier and a shrinkage pipe. The expansion pipe is of a smooth streamline curved surface structure,local flow losses generated inside the expansion pipe are eliminated, and a curved surface bent segment at the tail of the expansion pipe is used for changing the flow direction of tail gas. The expansion pipe is internally provided with the flow guiding device; and the inner wall of the expansion pipe cooperates with the outer wall of the flow guiding device to guide flow of the tail gas, so that gas flow are more uniform in flow distribution when passing through the sepiolite carrier. The fixing rib plate is added, and the flow guiding device is fixed to the inner wall of the expansion pipe. The engine catalytic converter is applicable to purification, conducted under different working conditions, of the tail gas of a gasoline engine or a diesel engine and also applicable to ceramic honeycomb carriers and metal carriers of different hole densities and in different hole shapes; sepiolite is added to a carrier catalyst coating material, and compound conversion efficiency of the tail gas is improved; the streamline curved surface is adopted for the shrinkage pipe, and the flow resistance inside the shrinkage pipe is reduced; and the engine catalytic converter is simple in structure.

Description

technical field [0001] The invention relates to an engine catalytic converter, in particular to an engine catalytic converter with a novel expansion tube guide device and a sepiolite carrier. Background technique [0002] In traditional engine catalytic converters, the expansion tube is designed as a circular truncated structure with a straight-sided curved surface and a gradually increasing cross-section. The disadvantage is that when the exhaust gas enters the expansion tube, it is easy to form a vortex near the wall of the expansion tube and separate the gas wall. Phenomena such as these cause a large local flow loss inside the expansion tube, and at the same time cause the vehicle exhaust at the front end of the carrier to be unevenly distributed in the radial direction. The central area of ​​the carrier of the traditional catalytic converter is prone to rapid aging due to the large flow and high temperature due to the large flow rate and large thermal stress generated, ...

AI Technical Summary

Problems solved by technology

More importantly, the catalytic coating of the traditional catalytic converter carrier uses noble metal materials, which only have a single catalytic reaction, and its specific surface area is small, so it needs to load a large amount of precious metals to meet higher emission standards, which makes the catalytic converter higher production costs

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