Anti-clogging urea nozzle for vehicle and anti-clogging method of urea nozzle

Abstract

The invention discloses an anti-blocking urea nozzle for a vehicle. The anti-blocking urea nozzle comprises a urea conveying pipe, a nozzle body, a mounting plate, a connector pipe and a heat insulation sleeve; the outer end of the urea conveying pipe is connected with the nozzle body connected with the inner end of the connector pipe; the middle of the urea conveying pipe is fixedly sleeved with the mounting plate; the connector pipe communicates with a urea supply unit; one end of the heat insulation sleeve is propped against the mounting plate, and the other end of the heat insulation sleeve is propped against the nozzle; a groove is formed in the inner wall of the heat insulation sleeve; a closed heat insulation cavity is defined by the groove and the outer wall of the urea conveying pipe; an air inlet channel for introducing compressed cooling air into the heat insulation cavity and an air outlet channel for guiding out the cooling air are further formed in the heat insulation sleeve; and the air inlet channel is communicated to a vehicle compressed cooling air supply unit through a pipeline. According to the anti-blocking automotive urea nozzle and a urea nozzle anti-blocking method, the part, entering the tail gas pipe, of the urea nozzle is subjected to air cooling; the working temperature of the urea nozzle is reduced; and urea crystallization is prevented from blocking the nozzle.

Description

technical field [0001] The invention relates to the technical field of vehicle accessories, in particular to an anti-clogging vehicle urea nozzle and an anti-clogging method for the urea nozzle. Background technique [0002] With the deterioration of the atmospheric environment, national regulations have increasingly stringent requirements on vehicle emissions. Selective catalytic reduction SCR aftertreatment system has been widely used as the main aftertreatment technology to effectively reduce nitrogen oxides in exhaust gas. Selective catalytic reduction (SCR) is currently recognized as one of the most effective post-treatment technologies for reducing NOx emissions from diesel engines. Urea SCR sprays a certain amount of urea solution into the exhaust pipe, and the urea solution evaporates. The reducing agent NH3 is obtained in the process of pyrolysis and hydrolysis, and NH3 selectively reduces NOx to N2 under the action of the catalyst, thereby reducing the content of ...

AI Technical Summary

Problems solved by technology

[0003] The urea nozzle in the existing diesel engine exhaust gas treatment SCR system tends to crystallize or generate polymer to block the nozzle hole at high temperature and low flow rate, and the part of the nozzle conveying pipe entering the exhaust pipe is placed in the high temperature environment of exhaust gas for a long time, which affects the use due to poor cooling life

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