Abrasion-Protected Suction Lance for Diesel Exhaust Tank
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Solution Overview
Problem
Existing tank designs for storing liquid reducing agents in motor vehicle exhaust systems face issues with chafing and abrasion due to sloshing movements and ice formation, which can lead to damage and inefficiency in nitrogen oxide reduction systems.
Innovation Solution
The use of a flexible fabric hose and a combination of a soft suction lance with a hard fabric hose, along with a heating wire, provides effective abrasion protection and maintains flexibility, ensuring reliable contact with the liquid reducing agent while preventing ice formation and allowing for efficient thawing and recirculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard plastic hose is used for protection, then abrasion resistance is improved, but flexibility is worsened
Solution Approach 1:
The patent applies a composite structure combining a soft suction lance with a hard fabric hose. The fabric hose provides abrasion resistance through its hardened protective layer, while the soft suction lance inside maintains flexibility. This composite approach resolves the contradiction by integrating materials with complementary properties - the hard outer layer protects against wear while the soft inner layer preserves bendability and adaptability.
2Device complexity
If a planar spacer is used for protection, then structural simplicity is improved, but thermal connection is worsened
Solution Approach 1:
The patent replaces the planar spacer with a fabric hose that has a tubular, flexible structure. This fabric hose allows the liquid reducing agent to flow through it, creating direct thermal contact between the liquid and the heating wires embedded in the hose wall. The flexible tubular structure maintains simplicity while enabling superior thermal connection compared to a rigid planar spacer, as the liquid can continuously exchange heat through the hose walls.
Solution Approach 2:
The patent utilizes the hydraulic flow of the liquid reducing agent through the fabric hose to enhance thermal connection. The moving liquid creates forced convection heat transfer, allowing efficient heat exchange between the heating wires and the reducing agent. This hydraulic approach replaces the static thermal connection of a planar spacer with a dynamic, high-efficiency heat transfer mechanism.
3Measurement precision
If the suction lance is made rigid for stability, then positioning accuracy is improved, but resistance to sloshing damage is worsened
Solution Approach 1:
The patent employs a soft, flexible suction lance that can dynamically adapt to the sloshing movements of the liquid reducing agent. Instead of being rigid and vulnerable to impact damage, the flexible lance can bend and move with the liquid flow, absorbing the mechanical stress of sloshing. The lance maintains its functional positioning through flexibility rather than rigidity, resolving the contradiction between positioning stability and damage resistance.
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
This solution effectively prevents chafing and abrasion, maintains flexibility for frozen media, and ensures consistent thermal connection for efficient thawing and recirculation of the reducing agent, enhancing the reliability and performance of nitrogen oxide reduction systems.
Implementation Method 1
An abrasion-protected suction lance is advantageously provided with a heating wire which can thaw the suction lance and the ice in the relatively close surroundings thereof
Implementation Method 2
a consistent thermal connection of a continuous liquid region of the active ingredient between the wall of a suction lance, which is provided with heating wires, and adjacent ice regions is ensured through the holes of the abrasion protection
Data Source
AI summary
The invention relates to a tank for storing a liquid active ingredient for operating an aggregate of a motor vehicle, particularly a unit for post treatment of exhaust gases of the motor vehicle, comprising a container and at least one functional element (11, 18) extending into the container, wherein the functional element is provided with at least one agent (25, 26) for abrasion protection.