Urea solution tank filling assembly used for SCR system

Abstract

The invention discloses a urea solution tank filling assembly used for an SCR system. The urea solution tank filling assembly comprises a tank cover and a filling opening, the filling opening is formed in a urea solution tank, and a chain is connected between the filling opening and the tank cover. The tank cover comprises an upper outer cover body and a lower outer cover body, a ventilation cavity is formed in the center of the lower outer cover body, a plurality of ventilation holes are formed in the bottom of the ventilation cavity, ventilation film is arranged at the portion, located above the ventilation holes, of the ventilation cavity, a plurality of ventilation grooves are formed in the top of the lower outer cover body, the top of the lower outer cover body is connected with the interior of the upper outer cover body, the bottom of the lower outer cover body is connected with the filling opening, one end of the chain is connected to the top of the upper outer cover body in a rotatable mode, the other end of the chain is connected to the filling opening, and the filling opening is of an integrated structure. The urea solution tank filling assembly is convenient to assemble, and normal rotation of the tank cover can be guaranteed; in addition, expansion, caused by the fact that gas can not be effectively removed, of a tank body can be effectively prevented, and normal running of the system can be guaranteed.

Description

technical field [0001] The invention relates to an SCR system, in particular to a urea solution tank filling assembly for the SCR system. Background technique [0002] SCR (Selective Catalyst Reduction) for diesel engine selective catalytic conversion system refers to a catalytic reduction device installed in the exhaust system of diesel vehicles to catalytically reduce NOx in diesel engine emissions into N2 and O2, and urea aqueous solution is selected as the reducing agent. Urea aqueous solution is injected into the exhaust pipe upstream of the catalyst, and under the action of exhaust gas temperature and air flow, it is hydrolyzed into CO2 and ammonia, and ammonia acts as a reducing agent to reduce NOx into pollution-free nitrogen and water. [0003] The urea solution tank is an essential and important component in the SCR system. At present, the existing filling assembly of the urea solution tank used in the SCR system generally has the following disadvantages: [0004]...

AI Technical Summary

Problems solved by technology

[0004] 1) The chain used to connect the tank cover is easy to wrap around the tank cover during the rotation of the tank cover, causing the tank cover to fail to continue to rotate normally;

[0005] 2) During use, the gas inside the tank will not be discharged, causing the tank to expand;

[0006] 3) The filling port is assembled from multiple parts, which is cumbersome to assemble

[0007] These above-mentioned shortcomings have seriously affected the stability and economy of the whole SCR system, and become a problem urgently to be solved by those skilled in the art

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