Insert type metal carrier unit for exhaust after-treatment

Abstract

The invention relates to an insert type metal carrier unit for exhaust after-treatment, and is characterized in that two gauze screens or sinter felt filter pieces A and B with equal lengths and equal widths are adopted; the length of each long felt filter piece is rightly N times of the width thereof; beginning from one end, mutual overlapping is vertically carried out, A1 is at the upper part, B1 is at the lower part, and the A1 and the B1 at the beginning end are firstly welded together by using electric resistance welding or pint welding; then, each filter piece is folded with 180 degrees, two filter pieces are intersected and folded vertically till the other end Ai and Bi are overlapped; an oil hydraulic press is statically pressed to form an accordion-shaped assembly with inserted filter pieces mutually; the Ai and B1 of the assembly are overlapped, and then the Ai and B1 are welded together by using electric resistance welding or pint welding; the center and both ends are fixed by using a central spindle and a retainer ring; therefore, the insert type carrier unit is formed; in this way, a plurality of uniformly distributed wedge cushion spaces are distributed at an entrance end or an exit end so that the back pressure is reduced and the replacement and maintenance interval is prolonged under the condition that the filter effect is not reduced; and therefore, as an after-treatment carrier, the product an be used as a carrier of DOC, POC, DPF and SCR, and has certain practical meaning and higher use value.

Description

technical field [0001] The invention relates to an insert type metal carrier unit for exhaust gas post-treatment, which is applied to the DOC, SCR, DPF or POC post-treatment industry of automobile exhaust. Background technique [0002] At present, the world is facing comprehensive challenges of energy and environment. In the selection of technical means to meet the emission standards of traditional vehicles, people still face many difficulties, for example, how to choose the carrier and catalyst for post-treatment. [0003] The post-processing carrier is the key factor to constitute the vehicle after-processing platform. Up to now, most of the post-processing carriers are imported ceramic carriers. Similarly, some mature metal carriers with special structures are also monopolized by foreign technologies and patents, which has become a key factor restricting the development of China's post-processing industry. [0004] Therefore, how to obtain low-cost and high-performance ...

AI Technical Summary

Problems solved by technology

[0006] The ceramic carrier used in post-processing usually uses a special cermet 3M gasket to 'include' the carrier, and fix the carrier and the shell package together to meet the anti-vibration requirements of the vehicle's cold and hot states, but , on the one hand, the cost of materials is high, on the other hand, the packaging must use robot production lines, which affects the competitiveness of products

[0007] However, the metal carrier unit used above is not suitable for using the 3M gasket of this metal ceramic when packaging.

Here, it is not to say that there is no problem with the packaging of the metal carrier. On the contrary, various technical measures must be taken to meet the anti-vibration requirements of the cold and hot states of the vehicle; for example, the columnar metal carrier can be integrated The brazing process is carried out in a vacuum brazing furnace. Although this process can well solve the strength problem of the carrier unit, the cost of equipment and production process is high, and it is completely inconsistent with the green process of low-carbon energy saving and environmental protection. Features: It is also possible to install support structures at both ends of the columnar metal carrier, or to 'cross the ribs' between the columnar metal carriers, etc. These measures have changed the most basic airflow field of the carrier The uniformity of the distribution, the result is 'local uneven force', which will cause damage in the form of displacement and other forms when passing the GB or HJ vibration test

[0008] Similarly, metal carriers with various wire mesh structures have appeared on the market. However, there are different degrees of clogging problems in this kind of samples in the prescribed 500~1000h bench aging test. The back pressure index of the measured samples The detection is greater than 15kpa, and the highest is 23kpa. When the back pressure is high, the fuel economy of the vehicle will deteriorate. The reason for these clogging problems comes down to the macroscopic results of this type of carrier and the optimization of the microstructure. The air flow channel should be optimized while the area (filter bed volume) is used;

Images