Purification and noise elimination integrated engine catalytic converter based on negative poisson ratio metamaterial

Abstract

The invention relates to a purification and noise elimination integrated engine catalytic converter based on a negative poisson ratio metamaterial. The purification and noise elimination integrated engine catalytic converter is composed of a flange, an expansion pipe, a shell, a cushion layer, a negative poisson ratio metamaterial sound insulation layer, a negative poisson ratio metamaterial frontcarrier, a negative poisson ratio metamaterial rear carrier and a shrinkage pipe. The expansion pipe and the shrinkage pipe are of smooth streamline curved surface structures, at least two sections of carriers of different structures are distributed in the cushion layer, and gaps are reserved between the carriers so as to improve the flowing characteristic of airflow. The section area of a micro-channel of each section of the negative poisson ratio metamaterial carrier is gradually changed, and the section of the fan-ring-shaped micro-channel and the section of the negative poisson ratio metamaterial micro-channel are compounded to reduce radial thermal stress and carrier vibration; and the negative poisson ratio metamaterial sound insulation layer is arranged between the shell and the cushion layer so as to improve the noise elimination capacity of the catalytic converter. The purification and noise elimination integrated engine catalytic converter is simple in structure, purification and noise elimination functions of the catalytic converter are integrated by adopting a negative poisson ratio metamaterial, the conversion efficiency of the catalytic converter is improved, and theservice life of the catalytic converter is prolonged.

Description

technical field [0001] The invention belongs to the technical field of automobile engine tail gas purification and noise reduction equipment, and in particular relates to an integrated engine catalytic converter for purification and noise reduction based on a negative Poisson's ratio metamaterial. Background technique [0002] The existing multi-stage catalytic converter carrier mostly adopts a regular polygonal honeycomb structure with equal flow area. This structure has a certain air-to-gap ratio, which can ensure a good contact between the airflow and the carrier, but at the same time it will also make the exhaust gas The flow rate has a certain velocity gradient in the cross-section of the carrier, that is, the closer to the center of the carrier, the faster the exhaust gas flow rate. This non-uniform flow rate leads to rapid aging of the catalyst in the central region of the carrier, while the catalyst in the edge region cannot be properly utilized. At the same time, t...

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Problems solved by technology

[0005] In view of the shortcomings of existing catalytic converters such as low utilization efficiency of the catalyst, short service life of the carrier, poor noise reduction performance, etc., the technical problem to be solved by the present invention is to provide a device that not only has a good noise reduction function, but also ensures a Under the premise of good exhaust gas purification effect, the engine catalytic converter structure can effectively reduce the radial thermal stress of the carrier and improve the bearing capacity of the carrier to radial thermal stress

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