A new type of urea filter with pressure relief capability

Abstract

The invention relates to the technical field of urea filters, and discloses a new type of urea filter with pressure relief capability, including a filter joint and a housing, a positioning piece is fixedly installed inside the upper part of the housing, and a positioning piece is fixedly installed on the upper end of the positioning piece The reverse cut-off valve spring is provided with a reverse spool at the middle position of the reverse cut-off valve spring. In the present invention, flow and pressure sensors are added to the liquid return pipeline to detect the working state of the filter and remind the operator to clean or replace the filter element in time, thereby ensuring the stable operation of the post-processing system and reducing the freezing and cracking of the pipeline Currently, the existing devices on the market directly filter the exhaust gas, but this design is to add a filter to the pipeline process of the exhaust gas after-treatment system to filter the urea solution in the pipeline, thereby prolonging the after-treatment of exhaust gas. service life of the treatment system. At the same time, in order to ensure the working stability of the post-processing system, a pressure relief valve is added to the pipeline filter.

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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