Mixer and exhaust gas aftertreatment system

By designing the inner tube to extend the outer tube and setting the bypass channel, combined with heat exchange and flow guiding elements, the problem of balancing the mixing uniformity and exhaust back pressure in the mixer was solved, achieving uniform mixing of exhaust gas and reducing agent and low exhaust back pressure, thus simplifying the structure of the mixer.

CN224432640UActive Publication Date: 2026-06-30FAURECIA EXHAUST CONTROL TECH DEVHANGHAI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
FAURECIA EXHAUST CONTROL TECH DEVHANGHAI
Filing Date
2025-08-08
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing mixers, while ensuring the uniformity of mixing of exhaust gas and reducing agent, have high exhaust back pressure, making it difficult to balance the relationship between mixing uniformity and exhaust back pressure.

Method used

The design employs an inner tube extending beyond the outer tube, with the jet angle β, distance a, and diameter D satisfying a specific formula to form a swirling flow. A bypass channel is set between the inner and outer tubes, and heat exchange elements and flow guiding elements are used to optimize the mixing effect, avoid the accumulation of reducing agent droplets, and simplify the structure.

Benefits of technology

While ensuring uniform mixing of exhaust gas and urea, the exhaust back pressure was reduced, improving mixing uniformity, simplifying the mixer structure, and reducing reliance on swirl blades and porous structures.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224432640U_ABST
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Abstract

This application relates to a mixer and an exhaust gas aftertreatment system. The mixer includes a cover with a nozzle through which a reducing agent spray enters the mixer, the spray angle of which is set to β; a base, the cover and the base surrounding and defining a receiving space, the base including an inlet opening and an outlet opening, the receiving space including an inlet area corresponding to the inlet opening, an outlet area corresponding to the outlet opening, and an intermediate area between the two; a pipe assembly extending in its extending direction from one end of the pipe assembly located in the inlet area to the other end of the pipe assembly located in the outlet area; the pipe assembly including an inner pipe and an outer pipe, the outer pipe being radially outside the inner pipe, the inner pipe providing a mixing space for mixing the reducing agent and exhaust gas, and the radial space between the outer pipe and the inner pipe providing a bypass channel for exhaust gas flow.
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