Atomization structure and ejector

Abstract

The invention discloses an atomization structure and an ejector. The atomization structure comprises a liquid flow guide device, a nozzle seat surrounding the liquid flow guide device, a throat structure formed between the nozzle seat and the liquid flow guide device, a gas channel communicated to the throat structure, an extension section and a telescopic mechanism. Compared with an existing atomization mechanism, a throat pipe structure which is shrunk and then enlarged is formed between the nozzle seat and the liquid flow guider, the speed of airflow changes along with the change of the spraying sectional area, the speed of the airflow is increased accordingly, and fluid is directly cut by the accelerated gas after flowing out of the liquid injection hole so as to be atomized; the extension section is in the process of continuously changing extension and contraction under the combined action of the fluid spraying force and the restoring force of the telescopic spring of the telescopic mechanism, so that the sprayed liquid mist type is in a continuously changing state; therefore, the dynamically changing fog type can be mixed with engine tail gas in multiple dimensions to achieve a better reaction effect.

Description

technical field [0001] The present invention relates to the technical field of injection components, and more particularly, to an atomizing structure and an injector. Background technique [0002] The atomization structure is a very important part of the injector, which is used to improve the atomization effect of the injected fluid, and is widely used in the engine fuel injection system, the exhaust pipe exhaust treatment structure and other fields of fluid injection atomization. Taking the urea reagent in the engine exhaust gas treatment system as an example, after the sensor detects the nitrogen concentration in the exhaust pipe, the controller adjusts the injection volume of the urea solution of the injector according to the sensor signal, and the injector atomizes and sprays the urea solution to the exhaust pipe. In the process, the urea spray is mixed with the exhaust gas to have a catalytic reaction to achieve the purpose of exhaust gas treatment. In order to improve...

AI Technical Summary

Problems solved by technology

These injection mechanisms lack the optimization of the spray mist pattern. When used in exhaust pipe exhaust treatment, they can only have a better treatment effect on the exhaust gas flowing through the set mist pattern area. However, the working conditions of the engine are complicated, and the exhaust pipe The exhaust gas is also dynamically changing. For example, when the exhaust volume increases sharply, the exhaust gas flow rate of the exhaust pipe increases, and the fixed mist injection mechanism cannot ensure that the urea spray covers or penetrates the exhaust flow, resulting in part of the exhaust gas not being able to mix with the urea spray.

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