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Air-assisting atomized urea spraying system and control method thereof

A urea injection system and air-assisted technology, which is applied to the electrical control of exhaust treatment devices, exhaust treatment, exhaust devices, etc., can solve the problems of high cost and low system reliability

Active Publication Date: 2016-05-04
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects and problems of high cost and low system reliability in the prior art, and provide an air-assisted atomized urea injection system with low cost and high system reliability and its control method

Method used

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  • Air-assisting atomized urea spraying system and control method thereof
  • Air-assisting atomized urea spraying system and control method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0063] see Figure 1 to Figure 2 , an air-assisted atomized urea injection system, comprising an air source 1, an airbag pressure tank 2, and an injection pipeline system 3, the air source 1 is connected to the airbag pressure tank 2 through an air circuit, and the airbag pressure tank 2 is connected to the injection pipeline system 3 Liquid connection, the injection pipeline system 3 is connected with the control unit 4 for signals, the inside of the air bag pressure tank 2 is provided with a urea solution area 21 and an air bag 22, and the urea solution area 21 is provided with an air bag 22, and the air bag 22 is sequentially passed through two The air outlet 62 of the one-position three-way valve 6, the air inlet 61 of the two-position three-way valve 6, and the pressure-stabilizing valve 5 are connected to the air path of the air source 1, and the air bag 22 passes through the air outlet 62, The exhaust port 63 of the two-position three-way valve 6 communicates with the a...

Embodiment 2

[0066] Basic content is the same as embodiment 1, the difference is:

[0067] see Figure 1 to Figure 2 , the air bag pressure tank 2 is provided with a pressure sensor 23, a liquid level sensor 24, a temperature sensor 25, and the pressure sensor 23, the liquid level sensor 24, and the temperature sensor 25 are all connected with the control unit 4 signals; The top is provided with a liquid increasing port 26, the liquid increasing port 26 is provided with a liquid increasing port cover 27, and the bottom of the air bag pressure tank 2 is provided with a filter 28 connected to the metering valve 31 in a liquid way.

Embodiment 3

[0069] Basic content is the same as embodiment 1, the difference is:

[0070] see Figure 1 to Figure 2 , the inside of the mixing chamber 33 is provided with an orifice 331 connected to the air path of the pneumatic switching valve 7, the mixing chamber 33 is provided with a mixing chamber pressure sensor 332, and the mixing chamber pressure sensor 332 is connected to the control unit 4 for signals; The air-assisted atomizing urea injection system also includes an SCR post-processor 8, the air inlet of the SCR post-processor 8 is connected to the gas path of the exhaust pipe 82, and the exhaust pipe 82 passes through the nozzle 32, the mixing chamber 33, and the metering valve 31 in turn. It is connected to the urea solution area 21 in a liquid way, and the SCR post-processor 8 is provided with an SCR post-processor temperature sensor 81 , and the SCR post-processor temperature sensor 81 is connected to the control unit 4 for signals.

[0071] The control air source 1 is spr...

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Abstract

An air-assisting atomized urea spraying system comprises an air source, an air bag pressure tank with a urea solution area and an air bag inside, and a spraying pipeline system. The air bag is connected with an air source air way after passing through a two-position three-way valve and a pressure-stabilizing valve in sequence and is communicated with the atmosphere after passing through the two-position three-way valve. The spraying pipeline system comprises a metering valve, a spraying nozzle and a mixing cavity. The spraying nozzle is connected with a urea solution area liquid way after passing through the mixing cavity and the metering valve in sequence. The mixing cavity is connected with the air source air way after passing through a pneumatic switch valve, the two-position three-way valve and the pressure-stabilizing valve in sequence. The two-position three-way valve and the metering valve are both connected with a control unit through signals. In the control process, the air source inflates and pressurizes the air bag, and therefore urea and air in the mixing cavity are mixed and then sprayed; when urea stops being sprayed, air in the air bag enters the mixing cavity and the spraying nozzle after passing through the pneumatic switch valve to purge the spraying pipeline system, air in the air bag is led to the atmosphere after passing through the two-position three-way valve so that the air bag can be deflated and depressurized. The air-assisting atomized urea spraying system is low in cost and high in reliability.

Description

technical field [0001] The invention relates to a urea metering injection atomization system used for post-treatment of diesel engine exhaust, in particular to an air-assisted atomization urea injection system and a control method thereof, which are mainly applicable to reducing system cost and improving system reliability. Background technique [0002] The urea metering injection atomization system for diesel engine exhaust post-treatment belongs to the exhaust gas purification system of internal combustion engine, specifically, it is a SCR (Selective Catalyst Reduction) selective catalytic reduction system used to reduce NOx emissions from diesel engines. [0003] In order to realize urea injection, the existing SCR urea injection system generally uses a DC electric diaphragm pump to pressurize the urea solution. However, the DC electric diaphragm pump is used. On the one hand, the electric diaphragm pump in automobiles and other vehicles needs to be powered by batteries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N3/28F01N9/00
CPCF01N3/208F01N3/28F01N9/00F01N2570/14F01N2610/02Y02T10/12Y02T10/40
Inventor 陈小迅杨细元刘志辉张辉亚胡前刘双平唐天清相耀明
Owner DONGFENG COMML VEHICLE CO LTD
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