An easy-to-clean, rotatable and crystallization-resistant scr nozzle

Abstract

The invention relates to a convenient cleaning, rotatable and anti-crystallization SCR nozzle. The related SCR nozzle is easy to clean, rotatable and anti-crystallization has an air valve sleeved on the seat ring; one end of the air valve is sealed with the seat ring through a conical surface; one end of the air valve valve body is connected to the The conical surface is connected in one piece; the end of the valve body close to the variable diameter section has a missing groove; there is a conduit between the air valve and the seat ring; there is an annular gap between the large-diameter cylinder of the conduit and the end face of the seat ring; the valve body of the air valve A spring is sleeved; one end of the spring is elastically connected to the conduit, and the other end is elastically connected to the rotating structure of the air valve; the SCR nozzle also has a sleeve sleeved on the valve body; the sleeve and the valve body are used to compress air A channel; a protective tube fixedly connected to the seat ring is sheathed outside the sleeve; a urea solution channel is formed between the protective tube and the sleeve, and between the protective tube and the catheter. The invention improves the injection speed of urea, facilitates the atomization of urea, and facilitates the disassembly of the air valve.

Description

technical field [0001] The invention relates to an SCR nozzle used on a diesel engine, in particular to an SCR nozzle which is easy to clean, rotatable and crystallization-proof. Background technique [0002] Nitrogen oxides are one of the main harmful emissions from diesel engines; commonly known as nitrogen oxides. Exhaust into the atmosphere will cause a series of environmental problems through physical and chemical effects; Selective Catalytic Reduction (SCR), the principle is that the reducing agent selectively reacts with the nitrogen oxides in the exhaust gas under the action of the SCR catalyst to generate Harmless nitrogen and water, but the nozzle hole is large, the urea pressure is low, the gas needs to be brought into the urea to enter the exhaust pipe, and react with the nitrogen oxides discharged, and the intake pressure is small at the beginning of urea spraying or at the end of urea spraying , It is easy to cause uneven spraying of urea, resulting in crystal...

AI Technical Summary

Problems solved by technology

The timing signal plate is fixed on the camshaft gear through bolts and four asymmetric bolt mounting holes on the camshaft gear. This utility model cannot automatically adjust the fuel injection timing, which is inconvenient to use

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