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A scr injection system

An injection system and nozzle technology, applied in the direction of machine/engine, mechanical equipment, engine components, etc., can solve the problems of large volume, complex system and high application difficulty of diaphragm pumps

Active Publication Date: 2019-05-17
ZHEJIANG FAI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the way to remove the solution by vacuuming is mostly limited to the diaphragm pump solution. The diaphragm pump is relatively large in size, and it will cause the system to be too complicated and lose its application value when it is specially used to pump back the solution.
[0008] In summary, there are problems such as complex structure and high application difficulty in solving the problem of residual solution in the SCR system with the existing technology

Method used

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  • A scr injection system
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Examples

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Embodiment Construction

[0042] Such as figure 1 As shown, it is one of the schematic diagrams of the structure of the SCR injection system provided by the present invention, which includes a pulse pump 1, a nozzle 2, an injection vacuum device 3 and a controller 4 for giving driving signals. The pulse pump 1 receives the pulse signal of the controller 4 to generate pressurized fluid, which provides a jet source for the nozzle 2 and the injection vacuum device 3.

[0043] The pulse pump 1 is a sleeve-piston structure, including an electromagnetic device 15 and a plunger pump assembly 11 . Among them, the plunger pump assembly 11 includes a sleeve 21, a plunger 20, a return spring 18, an inlet valve 13 and an outlet valve 17, the sleeve 21 and the plunger 20 are closely matched to form a pressure delivery volume 12, and the return spring 18 acts on the sleeve 21. The electromagnetic device 15 includes a solenoid 14 , a yoke 16 , a magnetic gap 19 and an armature 22 . The armature 22 and the sleeve 2...

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Abstract

The invention discloses a SCR injection system. The SCR injection system comprises a pulse pump, an injection vacuum device, a nozzle, and a controller for generating driving signals. The pulse pump receives controller pulse signals to generate pressure fluids so as to supply injection sources to the nozzle and the injection vacuum device. The pulse pump includes an electromagnetic device and a plunger pump. The injection vacuum device includes an injection pipe, an injection cavity, a negative-pressure cavity, a guide port, an electromagnetic conversion switch and an injection outlet. The nozzle includes a filter, a nozzle valve, a bypass valve, a cooling device, a cyclone runner and a cyclone spraying hole. The first purpose of the invention is to provide the SCR injection system, with simple structure, good adaptability, high control precision and convenience for installation, replacement and maintenance, and a control method thereof; and the second purpose is to lower the cost of a liquid injection metering system for exhaust aftertreatment of the engine.

Description

technical field [0001] The invention belongs to the technical field of engine exhaust post-treatment, in particular to a NOx selective catalytic reduction (SCR) system for engine exhaust post-treatment and its control technology. Background technique [0002] Liquid injection metering has a wide range of applications in the fields of chemical industry, medical treatment and power machinery, especially involving multiple core technologies of internal combustion engine power. For example, in order to reduce the harmful pollutants in the exhaust gas of a diesel engine or a lean-burn direct-injection gasoline engine, NOx selective catalytic reduction (SCR=Selective Catalytic Reduction) technology. [0003] SCR technology requires, for example, 32.5% weight concentration of urea aqueous solution (also known as diesel exhaust treatment fluid DEF = Diesel Exhaust Fluid, or add blue liquid AdBlue) quantitative injection into the diesel engine exhaust, through the exhaust high tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/28F01N3/20
CPCY02T10/12
Inventor 郗大光徐露明张平
Owner ZHEJIANG FAI ELECTRONICS
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