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Metal filtering core and production thereof

A technology of metal filter elements and manufacturing methods, applied in separation methods, chemical instruments and methods, and dispersed particle filtration, etc., can solve problems such as poor resistance to shock and vibration, inability to increase the ratio, anisotropy of physical parameters, etc., and achieve effective The effect of interception

Inactive Publication Date: 2007-09-12
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce particle emissions, a filter made of a honeycomb ceramic matrix is ​​known. The exhaust gas to be purified flows into the filter channel in the filter, and the adjacent channels are closed alternately, so that the exhaust gas enters the channel from the inlet end of the filter and penetrates. Ceramic wall, and re-discharge at the filter outlet through adjacent channels, its main disadvantage is the anisotropy of physical parameters, the radial expansion coefficient is twice the axial expansion coefficient, so it is prone to thermal stress damage, while resisting impact , vibration performance is poor
In order to solve these problems, people have utilized the good toughness and impact resistance of metal filter materials to produce metal filter elements. Traditional metal filters have been disclosed in Japanese Patent Publication No.Hei9-245938, No.Hei11-257048 and 2002-27915. Based on the design concept of an open filter system, it is made of a metal porous body with a wavy or convex-concave shape along the vortex direction, and many through holes are formed on the wavy or convex-concave peaks or valleys. Each of the through holes has a burr-like or yoke-like protrusion formed in an edge portion thereof, which is positioned within the opposing surfaces of the metal porous bodies in a state where the metal porous bodies are joined to each other and forming an exhaust gas passage in which unburned soot particles in the exhaust gas entering a turbulent state are captured by the peak or valley surface of the metal porous body and further captured by the burr-shaped or yoke-shaped protrusions used as obstacles, However, due to the small cross-sectional area of ​​the passage and the ratio of the area in contact with the black smoke area to the cross-sectional area of ​​the passage cannot be increased, a lot of black smoke is ejected together with the exhaust gas, but is not captured by the metal filter, and cannot be removed as expected Efficiency of soot particles
Japanese Patent Publication 200410045256.2 is improved on the basis of the above, by increasing the barrier distribution rate and changing the direction of the edge of the through-hole in the corrugated or concave-shaped metal porous body in order to obtain a higher passage cross-sectional area in a limited space, so that the metal The filter can enhance the capture efficiency, but it still cannot completely remove the soot, especially for diesel vehicles that use high-sulfur diesel and have a large original soot emission, the capture efficiency is still not ideal

Method used

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  • Metal filtering core and production thereof
  • Metal filtering core and production thereof
  • Metal filtering core and production thereof

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Embodiment Construction

[0028] As shown in Figures 1 to 4, a metal filter element according to the present invention includes:

[0029] A group of filter element units folded, welded and compacted by multi-layer porous metal strips 1 and metal strips 2 packaged on both ends of the filter element group in the direction of the vertical welding seam, wherein the surfaces of two adjacent layers of porous metal strips 1 are respectively pressed There are columnar support channels 12 that are mutually misaligned and can support each other, and the space formed by two adjacent columnar support channels 12 between adjacent two porous metal strips 1 can capture and remove the exhaust gas contained in diesel engines. Exhaust gas filter channel 11 for black smoke particles.

[0030] The manufacture method of metal filter element of the present invention, comprises the following steps:

[0031] Step 1, the metal powder, binder and wire mesh are coated, sintered, and rolled to make a porous metal strip 1; at thi...

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Abstract

A metallic filter core for the diesel-engine vehicle is composed of a cluster of filter core units made up of the porous thin metal band through repeated folding, pressing and welding and the long metal strips arranged the both ends of each welded seam. Each layer of said metal band has the staggered supporting slots to form the tail gas filtering channel. Its advantages are small size, high strength and high filter effect.

Description

technical field [0001] The invention relates to a metal filter element for removing black smoke particles and a manufacturing method thereof, in particular to a metal filter element for capturing soot particles of a diesel vehicle made of metal porous material and a manufacturing method thereof. Background technique [0002] Diesel vehicle exhaust contains a lot of soot particles, these particles are mainly composed of black carbonaceous substances and soluble hydrocarbons, the average particle size is small, easy to suspend in the atmosphere, easily inhaled by the human respiratory tract and deposited in the alveoli It is very harmful to human health. In order to reduce particle emissions, a filter made of a honeycomb ceramic matrix is ​​known. The exhaust gas to be purified flows into the filter channel in the filter, and the adjacent channels are closed alternately, so that the exhaust gas enters the channel from the inlet end of the filter and penetrates. Ceramic wall, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D46/00F01N3/022
Inventor 蔡一湘张殿武张立华周华云
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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