An air-assisted urea pump using a two-stage diaphragm pump
An air-assisted, diaphragm pump technology, applied in pumps, pump devices, exhaust devices, etc., can solve the problems of insufficient suction and metering accuracy of diaphragm pumps, and achieve the effects of improving suction performance, ensuring performance and stability, and long life
Active Publication Date: 2020-12-08
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides an air-assisted urea pump using a two-stage diaphragm pump, in which the first diaphragm pump and the second diaphragm pump are designed in combination with the characteristics of the air-assisted urea pump itself. Diaphragm pump, and use the first diaphragm pump to provide urea solution for the second diaphragm pump, which can effectively solve the problem of low metering accuracy caused by insufficient suction of the diaphragm pump, so it is especially suitable for the application of diesel engine exhaust gas treatment
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[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0023] Such as figure 1 As shown, the embodiment of the present invention proposes an air-assisted urea pump using a two-stage diaphragm pump, which includes a first diaphragm pump 6, a urea tank 1, a second diaphragm pump 7, a urea nozzle 16 and an air source 15, wherein :
[0024] The liquid inlet end of the first diaphragm pump 6 is connected to the urea tank 1 through the liquid inlet pipe...
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The invention belongs to the field of diesel engine tail gas treatment, and particularly discloses an air-assisted urea pump adopting a two-stage membrane pump. The air-assisted urea pump comprises afirst membrane pump, a urea box, a second membrane pump, a urea nozzle and an air source, wherein the liquid inlet end of the first membrane pump is connected with the urea box through a liquid inletpipeline, the liquid outlet end of the first membrane pump is divided into two paths, one path is connected with the urea box through a first liquid returning pipeline, the other path is connected with the liquid inlet end of the second membrane pump, the liquid outlet end of the second membrane pump is divided into two paths, one path is connected with the urea box through a second liquid returning pipeline, and the other path is connected with the urea nozzle through an injection pipeline; and the air source is divided into two paths, one path is connected with the air inlet end of the firstmembrane pump and the air inlet end of the second membrane pump through a two-position four-way electromagnetic valve, and the other path of the air source is connected with the urea nozzle. The problem that due to insufficient liquid inlet, metering precision of the urea pump is low can be effectively solved. The metering precision of the second membrane pump is greatly improved, and meanwhile,the reliability of the urea pump is improved.
Description
technical field [0001] The invention belongs to the field of diesel engine tail gas treatment, and more specifically relates to an air-assisted urea pump using a two-stage diaphragm pump. Background technique [0002] The exhaust gas emitted by diesel engines after combustion contains a large amount of particulate matter and NOx, which poses a great threat to air quality. In order to reduce environmental pollution, the emission regulations of various countries further require the reduction of NOx emissions in the exhaust of diesel vehicles, among which SCR technology has become the mainstream technology for reducing NOx emissions of diesel vehicles. The urea pump is one of the core components of the SCR system, and it is a device that delivers urea solution to the urea nozzle. [0003] Urea pumps can be divided into air-assisted and non-air-assisted. The air-assisted urea pump is a device that is assisted by compressed air to deliver a precisely metered urea solution to th...
Claims
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IPC IPC(8): F01N3/20F01N3/28F04B13/00F04B23/04F04B43/073
CPCF01N3/208F01N3/28F01N2610/02F01N2610/144F01N2610/1473F04B13/00F04B23/04F04B43/073
Inventor 杨曙东潘希伟史有程
Owner HUAZHONG UNIV OF SCI & TECH