Non-air-assisted urea pump adopting novel reversing valve and application thereof

Abstract

The invention belongs to the field of automobile exhaust treatment and particularly discloses a non-air-assisted urea pump adopting a novel reversing valve and application thereof. The urea pump comprises the novel reversing valve and a diaphragm pump, wherein the novel reversing valve comprises a first electromagnetic valve and a second electromagnetic valve which are the same in structure, eachelectromagnetic valve comprises a static iron core, a first through hole, a coil, an armature, a spring, a second through hole and a third through hole, the center of the static iron core is providedwith the first through hole, the coil is sleeved outside the static iron core, the armature is arranged at a lower end of the static iron core, an upper part of the armature is connected with the spring, a bottom end of the electromagnetic valve is provided with the second through hole and the third through hole, a liquid inlet end of the diaphragm pump is connected with the second through hole ofthe first electromagnetic valve, and a liquid outlet end of the diaphragm pump is connected with the second through hole of the second electromagnetic valve. The urea pump is advantaged in that the armature and a valve element are integrally designed, the armature, namely the valve element, is controlled by the coil and the spring to do linear motion in the vertical direction, so conversion of the flow direction of urea solution is achieved, and the urea pump is compact in structure and smooth in motion.

Description

technical field [0001] The invention belongs to the field of automobile exhaust treatment, and more specifically relates to a non-air-assisted urea pump adopting a new reversing valve and its application. 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] The urea pump can be divided into air-assisted and non-air-assisted, and the non-air-assisted urea pump is a device that delivers urea solution with a stable pressure to the ...

AI Technical Summary

Problems solved by technology

The reversing valve core of the current non-air-assisted urea pump mainly rotates, which is prone to seal failure, resulting in short service life and poor stability of the urea pump

Images