Novel urea filter with pressure relief capability

Abstract

The invention relates to the technical field of urea filters, and discloses a novel urea filter with pressure relief capability. The novel urea filter comprises a filter joint and a shell. A positioning sheet is fixedly arranged in the upper part of the shell, a reverse stop valve spring is fixedly arranged at the upper end of the positioning sheet, and a reverse valve core is arranged in the middle of the reverse stop valve spring. A flow and pressure sensor is additionally arranged on a liquid return pipeline to detect the working state of the filter, and the operator can be timely remindedto clean or replace the filter element so that the stable work of a post-treatment system is ensured, and the risk of frost cracking of the pipeline is reduced; existing devices on the market at present directly filter automobile exhaust, while the filter is additionally arranged in the pipeline process of the exhaust aftertreatment system, the urea solution in the pipeline is filtered, and thus the service life of the exhaust aftertreatment system is prolonged. Meanwhile, the pressure release valve is additionally arranged at the pipeline filter so as to guarantee the working stability of thepost-treatment system.

Description

technical field [0001] The invention relates to the technical field of urea filters, in particular to a novel urea filter with pressure relief capability. Background technique [0002] With the rapid development of my country's automobile industry, air pollution is becoming more and more serious, and emission regulations are becoming more and more stringent. In order to adapt to the development of the society, various domestic automobile manufacturers mostly adopt selective catalytic reduction (SCR) tail gas post-treatment control technology to reduce the emission of harmful substances in engine exhaust to meet the emission requirements. [0003] At present, the consumables that must be used in SCR technology are vehicle urea solutions, and when the purity of the selected vehicle urea solution is not enough, and there are particles, heavy metal ions and other impurities, it will damage the nozzles and filters of the vehicle SCR system. Parts cause serious damage and cause u...

AI Technical Summary

Problems solved by technology

However, the filters currently used in the industry have defects such as complex structures, difficult disassembly and assembly, and limited scope of application.

At the same time, after part of the urea post-treatment system stops working, the urea liquid inlet pipe will not be emptied, and the urea solution will crystallize in a low temperature environment, resulting in volume expansion, resulting in the risk of freezing and cracking of the urea liquid inlet pipe

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