Exhaust system and automobile

Abstract

The invention discloses an exhaust system. The exhaust system comprises an exhaust pipe (21) and an SCR (Selective Catalytic Reduction) injection device which is arranged on the exhaust pipe (21); the SCR injection device comprises a nozzle (22) which is hinged to the exhaust pipe (21); the SCR injection device also comprises a sliding casing (23), a swing rod (24) and a driving part (25); the sliding casing (23) and the nozzle (22) are fixed; the swing rod (24) is connected with the exhaust pipe (21) in a rotating mode; the driving part (25) is fixedly connected with the swing rod (24); one end of the swing rod (24) is matched with the sliding casing (23) in a sliding mode; one end of the driving part (25) is located in the exhaust pipe (21); the rotating surface of the nozzle (22) and the rotating surface of the swing rod (24) are located in the surface of the exhaust flow direction and the rotating directions of the rotating surfaces are opposite to each other. According to the exhaust system, the reaction effect of a reducing agent and the exhaust can be improved and meanwhile the waste of the reducing agent is reduced. The invention also discloses an automobile.

Description

Technical field [0001] The present invention relates to the technical field of exhaust gas aftertreatment, in particular to an exhaust system. The invention also relates to an automobile. Background technique [0002] Cars emit a large amount of exhaust gas during operation. This part of exhaust gas usually contains more harmful substances, which will cause serious pollution to the environment. In order to reduce environmental pollution caused by automobile emissions, SCR (Selective Catalytic Reduction) technology has been widely used. [0003] SCR technology uses the SCR injection device to inject reductant into the engine exhaust. Under the action of exhaust gas temperature and air flow, the reductant can quickly decompose to release ammonia, reduce NOx to nitrogen, and achieve the effect of reducing the amount of NOx. The above-mentioned SCR injection device is usually installed on the exhaust pipe, and the following two methods are usually used for specific installation: [00...

AI Technical Summary

Problems solved by technology

[0006] Under the above two setting methods, the injection direction of the reducing agent remains unchanged. If the exhaust gas flow rate increases, the injection pressure of the reducing agent remains unchanged, and the collision force between it and the exhaust pipe is weaker than the exhaust gas flow rate, causing the reducing agent to The reaction effect with the exhaust gas is poor; if the exhaust gas flow rate decreases and the exhaust gas temperature is low, after the reducing agent collides with the exhaust pipe 12, the reducing agent is likely to crystallize directly on the inner wall of the exhaust pipe 12, resulting in waste of the reducing agent

[0007] In summary, how to alleviate the poor reaction effect of the reducing agent and the exhaust gas, and the waste of the reducing agent have become technical problems to be solved urgently by those skilled in the art.

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