Inclined Filler Head Venting Layout to Prevent Premature Nozzle Shut-Off
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Solution Overview
Problem
Existing filler heads for automatic nozzles in SCR systems often experience premature shut-off during refilling, especially when dealing with high filling rates and small bottle diameters, leading to incomplete filling of urea solution tanks in vehicles.
Innovation Solution
A filler head design featuring a body inclined at a predetermined angle with a buffer volume and a separating device that partitions fluid flows between the filling and venting lines, ensuring a laminar flow and direct venting, thus preventing shut-off until the tank is full.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high filling rate is used to quickly fill the urea solution tank, then the refilling time is reduced, but premature shut-off occurs during refilling leading to incomplete filling
Solution Approach 1:
The filler head is divided into distinct functional zones: a buffer volume region for high-speed filling and a laminar flow region for precise metering. The separating device partitions the cavity into these zones, allowing each to perform its specialized function without interference, thus enabling high filling rates while preventing premature shut-off
Solution Approach 2:
The buffer volume acts as an intermediary chamber between the filling line and the tank. It receives fluid at high speed, reduces flow velocity, and allows air bubbles to escape before fluid enters the laminar flow region, preventing premature shut-off caused by air pockets or turbulent flow
2Adaptability or versatility
If a small bottle diameter is used to match existing screw-on bottles, then compatibility is improved, but the filling rate is limited
Solution Approach 1:
The system dynamically adapts its flow characteristics based on the filling stage. During initial filling, the buffer volume accommodates high flow rates. As the tank fills and the nozzle approaches the fluid surface, the flow naturally transitions to laminar conditions, allowing the sensor to detect fullness without premature shut-off, thus maintaining compatibility with small bottles while achieving high filling rates
3Ease of operation
If the sensor is mounted upstream from the nozzle tip, then easier installation is achieved, but flow partitioning becomes difficult leading to premature shut-off
Solution Approach 1:
The cavity is designed with different flow characteristics in different regions. The buffer volume region upstream of the nozzle provides a calm, bubble-free environment suitable for sensor mounting, while the laminar flow region near the nozzle tip ensures accurate metering. The separating device creates this local differentiation, allowing upstream sensor mounting without compromising detection accuracy
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 design allows for continuous fluid dispensing without shut-off during refilling, improving the reduction of flow speed and air bubble bursting, ensuring the tank is filled completely, regardless of tank volume or refilling rate, and enhancing sensor accuracy by minimizing fluid mixing.
Implementation Method 1
a buffer volume in one-piece with the main part in a back portion of the body so as to reduce the speed of flow coming from the venting line
Implementation Method 2
the cylindrical wall guiding along a front portion of the body, located in an opposite direction to the back portion regarding the filling direction, any fluid outgoing from the nozzle so as to ensure: a laminar flow of the fluid outgoing from the nozzle towards the filling line
Implementation Method 3
the separating device being arranged to improve the partitioning of the flow coming from the venting line and the flow going to the filling line
Data Source
AI summary
A filler head for a storage system includes a body to be mounted inclined having a main part closed by a cover part forming a cavity in which a separating device is received. The filler head is configured to receive, in a cylindrical wall of the separating device, a distribution nozzle of a fluid with an automatic stop sensor to prevent overfilling of the filler head. The filler head includes a buffer volume in one-piece with the main part in a back portion of the body reducing the speed of flow coming from the venting line, and the cylindrical wall includes a recess facing the opening of the buffer volume in the back portion of the body.