Siphon Filter Assembly for Low-Level Vehicle Liquid Supply
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Solution Overview
Problem
Existing liquid supply devices for motor vehicles face issues with clogging of filtration members due to impurities, leading to reduced filtration flow rates and loss of liquid injection pressure, especially in polluted areas, which affects the accuracy of metering additives like ammonia precursors for selective catalytic reduction.
Innovation Solution
A liquid supply device with a filtration assembly featuring a siphon housing and a filtration member in the form of a vertically extending pocket, which ensures the filtration member remains immersed in liquid even when the tank level is low, preventing air suction and maintaining pressure, and includes a compact design with optimized filtration surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filtration member is arranged in the additive tank at the inlet of the supply pump, then the additive solution is filtered before injection, but the filtration member becomes clogged with impurities over time, reducing filtration flow rate
Solution Approach 1:
The patent introduces a vertical dimension to the filtration member by extending it from the tank bottom upward, creating a tall narrow filtration zone. This dimensional change allows the filtration member to remain submerged at low liquid levels while maintaining adequate filtration surface area, preventing air suction and maintaining flow rate despite impurity accumulation.
Solution Approach 2:
The patent positions the filtration member to extend upward from the tank bottom before liquid level changes occur. This preliminary positioning ensures that the filtration member remains submerged and functional even when the liquid level drops, preventing air from being drawn into the pump and maintaining continuous effective filtration.
2Measurement precision
If the liquid level in the tank drops below a threshold, then air is drawn into the supply pump, but this causes loss of liquid injection pressure and reduces metering accuracy
Solution Approach 1:
The patent uses vertical extension of the filtration member into the liquid from the tank bottom, creating a tall narrow filtration zone. This dimensional approach ensures the filtration member remains submerged at low liquid levels, preventing air suction and maintaining stable injection pressure and metering accuracy.
3Reliability
If the filtration member is exposed to air when liquid level is low, then air enters the supply pump, but this causes the pump to lose pressure and reduces SCR efficiency
Solution Approach 1:
The filtration member is pre-positioned to extend upward from the tank bottom, ensuring it remains submerged even when liquid levels drop. This preliminary positioning prevents air from entering the pump, maintaining supply pressure and SCR efficiency without requiring active control systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device maintains stable liquid injection pressure and filtration efficiency, even with severe clogging, ensuring precise metering of additives, and extends the service life of the filtration member by protecting it from impurities and optimizing the filtration surface.
Implementation Method 1
the housing forms a siphon connected to a suction inlet of the supply pump and includes an open end intended to open into the liquid contained in the liquid tank such that a path of this liquid in the siphon passes through a so-called high level
Data Source
AI summary
A liquid supply device for a motor vehicle includes: a supply pump intended for pumping liquid from a liquid tank to a liquid consumption device, and a filtration assembly for filtering the liquid pumped by the supply pump. The filtration assembly includes a housing in which a filtration member is housed. The housing forms a siphon connected to a suction inlet of the supply pump and includes an open end intended to open into the liquid contained in the liquid tank such that a path of this liquid in the siphon passes through a high level, which, when the level of the liquid in the tank is below a predetermined threshold, is higher than the level of the liquid in the tank. The filtration member includes a filtration zone in the form of a pocket of filtration material extending vertically into the housing.