Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Compressed air driven metering device of tail gas purification after-treatment system of internal combustion engine

A technology for exhaust gas purification and compressed air, which is applied in the direction of exhaust devices, noise reduction devices, machines/engines, etc., which can solve problems such as short service life, poor reliability, and anti-crystallization blockage, and achieve saving installation space, simple structure, and avoiding waterproofing Effect

Active Publication Date: 2013-03-27
LOTUSFAIRY POWER TECH
View PDF5 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of the above metering pumps have the following defects: 1) The mechanical structure is relatively complex, which naturally leads to poor reliability and is prone to failure; 2) There are relative mechanical movements (rotation or reciprocating motion) between some parts that require electromagnetic These factors lead to higher manufacturing costs and shorter service life; 3) and some pumps have higher requirements for the purity of the working medium; 4) In addition, these pumps are used in the harsh environment of the vehicle to varying degrees Various problems often occur when used under high conditions, such as anti-freezing, anti-crystallization blockage, sealing, anti-spray air pressure, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Compressed air driven metering device of tail gas purification after-treatment system of internal combustion engine
  • Compressed air driven metering device of tail gas purification after-treatment system of internal combustion engine
  • Compressed air driven metering device of tail gas purification after-treatment system of internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] see figure 1 As shown, a metering device driven by compressed air for an internal combustion engine exhaust gas purification post-treatment system includes an air control valve 100, a first liquid chamber 200, a second liquid chamber 300, a first pressure reducing device 400, a metering valve 500 and a controller 600;

[0033] The air control valve 100 is externally connected to compressed air through the first pipeline 101, connected to the atmosphere through the second pipeline 102 (or indirectly connected to the atmosphere through other devices, such as a reactant storage tank), and connected to the first liquid chamber 200 through the third pipeline 103. Connected and communicated, connected and communicated with the second liquid chamber 300 through the fourth pipeline 104, connected and communicated with the first decompression device 400 through the fifth pipeline 105;

[0034] The first liquid chamber 200 is provided with a first liquid inlet check valve 201 an...

Embodiment 2

[0039] see image 3 As shown, repeat embodiment 1, the difference is that the metering device also includes the following technical features:

[0040] The first pipeline 101 is provided with a second decompression device 410; since the pressure produced by the current vehicle-mounted air brake system is mostly between 8 and 12 bars, it is inconvenient to use it directly. In order to facilitate the use of the compressed air produced by the vehicle-mounted air brake system , add a second decompression device 410.

Embodiment 3

[0042] see figure 2 , image 3 , Figure 4 , Figure 5 and Figure 6 Shown, repeat embodiment 2, its difference is that described metering device also comprises following technical feature:

[0043] The inlet of the first liquid inlet check valve 201 and the inlet of the second liquid inlet check valve 301 are provided with a shared filter 204; so that the reactants entering the check valves 201, 301 will not contain particulate impurities. And block the pipe.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a compressed air driven metering device of a tail gas purification after-treatment system of an internal combustion engine. The compressed air driven metering device adopts compressed air to directly drive liquid, and comprises two liquid cavities, wherein the compressed air is alternately supplied to the two liquid cavities through an air control valve, so that the liquid in the liquid cavities is pushed and squeezed to a metering valve and is released by the metering valve; when one liquid cavity supplies the liquid to the metering valve, the other liquid cavity is replenished with the liquid, so that the two liquid cavities alternately supply the liquid to the metering valve uninterruptedly; and the pressure of the same air source for driving the liquid in the liquid cavities is further reduced to carry the liquid released by the metering valve to a nozzle, and then the liquid is sprayed into an exhaust pipe of the engine. The compressed air driven metering device is simple in structure, reliable, durable, insensitive to a working medium and low in cost, can resist the influence caused by the fluctuation of the air source pressure on the metering accuracy more easily compared with all the other metering devices, and can be integrated in a reactant storage box to save the mounting space and solve the problems about water resistance, dust prevention, sealing, freeze protection, anti-crystallization and the like.

Description

technical field [0001] The invention relates to a metering pump, in particular to a metering device driven by compressed air for an internal combustion engine tail gas purification post-treatment system. Background technique [0002] At present, the urea injection system used for aftertreatment of diesel engines is mainly the air-assisted system, especially for medium and heavy vehicles. The air-assisted urea injection system uses the brake compressed air on the vehicle as the air source. The usual practice is to lead the compressed air (injection aid air) to the urea metering pump, carry the urea liquid released from the metering pump to the nozzle, and finally spray it into the engine exhaust pipe. [0003] There are three main types of metering pumps currently in use: plunger pumps, diaphragm pumps and gear pumps. All of the above metering pumps have the following defects: 1) The mechanical structure is relatively complex, which naturally leads to poor reliability and i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F04F1/10F01N3/18
Inventor 李平
Owner LOTUSFAIRY POWER TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com