Metering pump for extracting, metering and releasing reducing agent solution in process of tail gas purification aftertreatment of combustion engine
A technology of exhaust gas purification and internal combustion engine, which is applied in the direction of pumps, mechanical equipment, exhaust devices, etc., can solve the problems of insufficient pumping capacity of metering pumps, inability to achieve accurate metering, and no commercialization prospects, etc. Simplicity and reduced installation space
Active Publication Date: 2013-08-21
LOTUSFAIRY POWER TECH
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Problems solved by technology
Although Ching H.Wu's invention has the advantages of small size, energy saving, accurate dosage and low manufacturing cost, it needs pre-pressurization
In practice, it has been found that if there is no pre-pressurization to effectively supply the liquid to the metering pump, the pumping capacity of the metering pump itself is insufficient to achieve accurate metering
The Bosch system has a complex structure, high energy consumption, high cost and large volume. Compared with a single metering pump system, it has no commercial prospects
Method used
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[0026] signal figure 1 The main structure of one form of the present invention, that is, a metering pump (hereinafter referred to as a device), is shown. The device is mainly composed of a cylinder body 300 and a piston 305. The piston reciprocates in the cylinder, and completes the extraction, measurement and release of liquid every reciprocating cycle. There is a part in the cylinder as a dose liquid chamber (hereinafter referred to as the lower liquid chamber or liquid chamber) 320, which is connected with the liquid extraction valve 310, the liquid release valve 315 and the liquid circuit 340. Wherein the valve 310 is a one-way valve, and its opening and closing are controlled by the flow direction of the liquid. When the piston 305 moves upward, a negative pressure is generated in the liquid chamber 320 , the liquid suction valve 310 is hydraulically opened, the liquid release valve 315 is closed, and the liquid is sucked into the liquid chamber 320 . When the piston 30...
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The invention discloses a metering pump for extracting, metering and releasing a reducing agent solution in the process of a tail gas purification aftertreatment of a combustion engine, which comprises a cylinder (300) and a piston (305). The cylinder (300) is externally provided with an electromagnetic coil, a fixed volume dosage liquid chamber (320) is arranged at the lower part of the cylinder(300), a liquid return groove (342) is arranged on the side wall of the cylinder, the horizontal line at the lower end of the liquid return groove (342) is a dosage line (350), a liquid release valve(315) is arranged at the lower part of the fixed volume dosage liquid chamber (320), a one-way liquid extraction valve (310) is arranged on the side of a communicated pore channel between the liquid release valve and the fixed volume dosage liquid chamber (320), the liquid extraction valve (310) is communicated with a reducing agent solution supply tube (33), and the liquid return groove (342) isalso communicated with the reducing agent solution supply tube (33). The metering pump has the advantages of simple structure, high reliability, low cost, stable dosage supply, high interference resistance, small installation size and less energy consumption.
Description
[0001] This application is a divisional application of an invention patent with the application number 200810180052.6, the title: "Metering and delivery method and device for extracting, measuring and releasing liquid", and the filing date: November 20, 2008. technical field [0002] The invention relates to emission control of an internal combustion engine, in particular to a metering pump used for extracting, measuring and releasing a reducing agent solution in a post-treatment system process of exhaust gas purification of an internal combustion engine. Background technique [0003] Due to the urgent need to improve fuel economy, the application of diesel engines and lean burn gasoline engines has increased rapidly in recent years. However, because the combustion chamber and its exhaust gas contain too much oxygen, these engines emit a large amount of nitrogen oxides and the method of using a common three-way catalyst cannot work. In response to this problem, various post-...
Claims
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IPC IPC(8): F04B13/00F01N3/08B01D53/92
Inventor 李平吴靖雄郭进端
Owner LOTUSFAIRY POWER TECH