Urea liquid supply module used for high-pressure vehicles and integrating liquid level sensor

Abstract

The invention discloses a urea liquid supply module used for high-pressure vehicles and integrating a liquid level sensor, belongs to the field of after treatment of automobile exhaust and aims to solve the problems that existing urea supply modules are unreasonable in structure and can harm disassembling persons easily during disassemble under air pressure and external filter pipelines are complex. The urea liquid supply module for the vehicles integrates a urea heat exchange water pipe, a gas inlet port, an exhaust port, a liquid supply pipe and a filter, integrates a urea liquid level and a urea temperature sensing signal and can resist the pressure of compressed gas of the whole vehicle chassis. The high-accuracy replaceable urea liquid filter is integrated and installed at a liquid inlet end of a urea liquid supply pipe. A damping hole is formed in an inlet of the liquid supply pipe to prevent high-speed jet of urea, and the safety is very high.

Description

technical field [0001] The invention belongs to the field of after-treatment of automobile exhaust. Background technique [0002] With the implementation of the National IV emission regulations for commercial vehicles, the vehicle must be equipped with after-treatment devices for nitrogen oxide (NOx) emissions. [0003] Selective catalytic conversion (SCR) technology is commonly used in China's medium and heavy-duty diesel engines, that is, the standard vehicle urea aqueous solution is injected into the exhaust, and the ammonia gas (NH 3 ) for selective catalytic reduction of NOx to produce harmless nitrogen (N 2 ) and water (H 2 O). [0004] The air-driven urea injection system is a system in which the urea tank accumulates air pressure to provide injection pressure. [0005] The urea supply module is installed on the urea tank of the gas drive system to provide urea liquid level and temperature signals, and integrate gas and liquid interfaces, which require good airtig...

AI Technical Summary

Problems solved by technology

When dismantling when there is air pressure in the urea tank, the unreasonable fixing structure is likely to hurt the dismantler

[0006] The system requires a urea filter to filter the urea solution, but the pipeline of the external filter is complicated

At the same time, urea solution freezes in winter and needs to be heated to thaw, resulting in expensive pipelines and filters

[0007] During the use of the product, if the urea pipeline is suddenly damaged, due to the high air pressure in the urea tank, the urea solution will be sprayed out at high speed, resulting in rapid loss of urea and even personal injury

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