Air pressure type urea metering spraying system easy to control

An injection system, pneumatic technology, applied in the direction of exhaust treatment, exhaust device, electric control of exhaust treatment device, etc., can solve the problem of high battery energy consumption, reduce the pressure wave in the tube, eliminate adverse effects, improve The effect of metering accuracy and stability

Inactive Publication Date: 2014-08-20
SOUTHWEST JIAOTONG UNIV
View PDF8 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of high energy consumption of the storage battery in the prior art and the deficiency in the design of the pneumatic urea injection metering device, the present invention provides a structural SCR urea injection system using a gas pressure source

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
  • Air pressure type urea metering spraying system easy to control
  • Air pressure type urea metering spraying system easy to control
  • Air pressure type urea metering spraying system easy to control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The present invention will be further described below in conjunction with drawings and embodiments.

[0016] The invention is a urea injection system using a gas pressure source, wherein the gas pressure source can be a high-pressure gas storage bottle, or an air compressor and a gas storage tank, and the working principles of the two methods are similar. Now take the implementation of an air compressor and an air storage tank as an example.

[0017] Such as figure 1 , 2 As shown, the air storage tank 2 is inflated by a small air compressor through the compressed air inlet. As a gas pressure source for vehicles, the working pressure is generally 0.8-1.0MPa. 18 is the urea pressure vessel I, and the volumes of the urea pressure vessels I / II selected in this embodiment are 1L. The urea pressure vessel I / II intake solenoid valve 30 / 26 is in the closed state, the urea pressure vessel I / II deflation solenoid valve 31 / 27 is in the open state, the urea pressure vessel I / II...

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 discloses an air pressure type urea metering spraying system easy to control. The metering spraying system comprises a urea tank, a compressed air source, urea spraying mechanisms and a controller, and two paths of branch systems which are connected with the compressed air source, independently, coordinately and alternately bear urea supplying and spraying functions and are composed of urea pressure containers and the urea spraying mechanisms are arranged. According to the branch systems, the urea pressure containers are provided with electromagnetic valves which are connected with the compressed air source and provided with air inlet electromagnetic valves and air exhaust electromagnetic valves, the two urea pressure containers are connected through the electromagnetic valves, the air inlet electromagnetic valves and the air exhaust electromagnetic valves are adjusted to generate constant air pressure for pressurizing urea solutions, and the working pressure of the two urea pressure containers ranges from 0.8 MPa to 1.0 MPa. According to the urea metering spraying system, a gas pressure source is adopted to control the spraying pressure of the urea solutions, the pressure of inlets of urea nozzles is constant, and the metering accuracy and stability of the urea solution spraying amount are obviously improved.

Description

technical field [0001] The present invention relates to a urea injection system for post-treatment of diesel engine exhaust, which belongs to the exhaust gas purification system of internal combustion engines; more specifically, it relates to a urea solution that uses a gas pressure source as power to inject urea solution to the exhaust system of a diesel engine to reduce Selective Catalytic Reduction SCR System for Diesel Engine NOx Emissions. Background technique [0002] In order to realize urea injection, the existing SCR urea injection system basically adopts two injection methods: air-assisted and non-air-assisted. Its working principle is to use a DC electric pump to pressurize the urea solution. The electric pump needs to be powered by the battery in both on-road and off-road vehicle and marine applications, requiring a lot of battery power. Recently proposed pneumatic urea injection systems such as CN102032029A patent, CN102242658A patent, and CN101975103A patent ...

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): F01N3/20F01N9/00
CPCY02T10/47Y02T10/40
Inventor 胡广地
Owner SOUTHWEST JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap