Magnetic valve structure for clean tail gas

Abstract

The invention discloses a solenoid valve structure based on cleaning tail gas, which includes a valve body and a valve cover that are matched, an air inlet and an air outlet are opened on the valve body, and the air inlet and the air outlet are connected through an air passage. , the upper part of the bonnet is equipped with an electromagnet assembly, the electromagnet assembly includes a shell, a coil support, a coil wound on the coil support, a sleeve assembled in the center of the coil support, a moving iron core that can move up and down in the sleeve, and a moving iron core fixed on the sleeve. The static iron core at the upper end of the tube, a magnetic isolation sheet is arranged between the static iron core and the moving iron core, a wear-resistant sleeve is arranged between the outer periphery of the moving iron core and the inner wall of the casing, and the lower end of the moving iron core and the The gas passages are matched; the bottom of the valve body is provided with a heating plate. The invention has the advantages of simple structure, long service life and good tail gas treatment effect.

Description

Technical field [0001] The present invention relates to the technical field of solenoid valve manufacturing, in particular to a solenoid valve structure for cleaning exhaust gas. Background technique [0002] A general solenoid valve is composed of an excitation coil, a fixed iron core, a compression spring, a movable iron core, and a valve body. Its working principle is that when the excitation coil is not energized, the sealing head of the fixed iron core will close the valve under the action of the back pressure of the compression spring and the air inlet of the valve. When the excitation coil is energized, the electromagnetic force overcomes the reaction force of the compression spring and the back pressure of the valve air inlet medium, causing the movable iron core to move to the fixed iron core until the two planes attract and the valve is in the open state. [0003] Proportional solenoid valve is a kind of solenoid valve, and its working principle is based on general solen...

AI Technical Summary

Problems solved by technology

Due to the frequent opening and closing of solenoid valves, it often causes severe wear of moving parts, resulting in a short service life of the solenoid valve; in addition, because the position of the static iron core of the existing proportional solenoid valve cannot be adjusted, the Increased assembly size requirements, which in turn increases processing costs

[0004] At present, there is a method in the exhaust gas treatment of automobiles, which is to use the ammonia gas released by solid ammonia to react with the nitrogen oxides in the exhaust gas to form nitrogen gas, thereby controlling the emission of nitrogen oxides. However, when the reaction temperature is too low, the solid ammonia cannot Releases ammonia well, resulting in unsatisfactory exhaust gas treatment

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