Liquid storage tank pressurized urea solution metering injection system for diesel vehicle

Abstract

The invention relates to a liquid storage tank pressurized urea solution metering injection system for a diesel vehicle, which comprises a liquid storage tank, an injector, an air storage tank, a first electromagnetic valve, a second electromagnetic valve, a Venturi pipe, a mixer and a control device, wherein the mixer comprises an inlet and an outlet which is opposite to the inlet and is communicated with the inlet, the injector is installed in the side wall of the mixer, the air storage tank is respectively in air-path connection with the second electromagnetic valve and the liquid storage tank through the first electromagnetic valve, the liquid storage tank is communicated with liquid in the injector, the second electromagnetic valve is in air-path connection with the Venturi pipe, the Venturi pipe is in air-path communication with the inlet of the mixer, the control device is electrically connected with the first electromagnetic valve, the second electromagnetic valve and the injector, and preferably, the liquid storage tank pressurized urea solution metering injection system also comprises safety control parts including a primary pressure reducing valve, a secondary pressure reducing valve, a liquid level sensor, a first temperature sensor, a first pressure sensor, and the like. The liquid storage tank pressurized urea solution metering injection system has artful design, simple structure, low cost, good reliability, safety and energy saving, is convenient to integrate into diesel engine tail gas post treatment, and is suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of vehicle exhaust post-treatment purification systems, in particular to the technical field of reducing agent injection devices for diesel vehicle exhaust post-treatment purification systems, and specifically refers to a diesel vehicle liquid storage tank pressurized urea solution metering injection system. Background technique [0002] At present, there are similar application technologies of reductant injection device for diesel vehicle exhaust post-treatment purification system at home and abroad, such as Chinese patent application CN200810014292.9, which discloses a diesel vehicle emission and urea tank reflector, which is connected by a single-chip intelligent controller through wires The urea liquid temperature sensor and liquid level sensor in the urea liquid tank, the urea liquid tank is connected to the pressure supply device through the conduit, the pressure supply device is connected to the urea l...

AI Technical Summary

Problems solved by technology

[0003] However, the "pressure supply device" in the prior art generally adopts the structure of "diaphragm pump + metering valve" or "electromagnetic pump + metering valve"; the structure of the above pump needs to be driven by a motor or electromagnetic drive to drive the diaphragm to vibrate. Furthermore, a pressure source is provided; the diaphragm pump is easy to break due to its complex structure, and its reliability is poor. At the same time, it also needs the cooperation of metering valves (pumps), so the structure is more complicated and the cost is higher.

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