Filling Head Suction Window for SCR Tank Degassing
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Solution Overview
Problem
Existing filling heads for vehicles' selective catalytic reduction (SCR) systems face issues with liquid backflow and sputtering due to inadequate degassing, leading to inefficient filling rates, often resulting in prolonged filling times and risk of fluid discharge, especially when the nozzle is at an angle or during maximum tank filling.
Innovation Solution
The filling head incorporates a suction window connecting the downstream section of the filling conduit to the degassing circuit, promoting gas suction and depressurization, along with a filling chamber to delay liquid backflow, and an annular sealing collar to prevent direct fluid rise, enhancing degassing and automatic shut-off reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filling head with automatic shut-off device is used, then liquid backflow is prevented, but liquid sputtering and discharge still occur due to inadequate degassing
Solution Approach 1:
The patent introduces a degassing circuit as an intermediary system between the filling conduit and the external environment. This circuit includes a suction window that connects to the filling chamber, allowing gases to be extracted through a separate pathway. The degassing circuit acts as a mediator that removes harmful gases without interfering with the liquid filling process or the automatic shut-off mechanism, thereby preventing sputtering and discharge while maintaining shut-off reliability.
Solution Approach 2:
The filling head is segmented into distinct functional zones: a filling conduit for liquid flow, a filling chamber for gas accumulation, and a degassing circuit for gas extraction. The suction window creates a separate gas extraction pathway that is spatially and functionally separated from the liquid filling pathway. This segmentation allows independent optimization of liquid filling and gas removal processes, preventing gas-related sputtering while maintaining reliable liquid shut-off.
2Productivity
If the filling rate is increased to save time, then filling efficiency improves, but gas accumulation increases causing backflow and sputtering
Solution Approach 1:
The degassing circuit operates continuously throughout the filling process, not just when gas accumulation becomes problematic. The suction window maintains a continuous gas extraction pathway from the filling chamber to the external environment, ensuring that gases are constantly removed as they are generated. This continuous action prevents gas accumulation regardless of the filling rate, allowing high-speed filling without sputtering or backflow.
3Ease of operation
If the nozzle is positioned at an angle for accessibility, then ease of operation improves, but liquid discharge risk increases due to inadequate degassing
Solution Approach 1:
The degassing circuit serves as an intermediary safety system that decouples the nozzle positioning from liquid discharge risk. By providing a dedicated gas extraction pathway through the suction window, the system handles gas management independently of nozzle orientation. This allows the nozzle to be positioned at optimal angles for accessibility without compromising safety, as the degassing circuit continuously removes gases that would otherwise cause sputtering or discharge regardless of nozzle angle.
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 design significantly increases the filling rate, reduces the risk of liquid discharge, and allows for multiple automatic shut-offs without fluid leakage, enabling faster and more reliable tank filling, even at varying nozzle angles and during maximum filling.
Implementation Method 1
a suction window which connects the downstream section of the filling conduit to the degassing circuit, so as to promote the suction of the gases via the degassing circuit, during the filling of the tank
Data Source
AI summary
A filling head for filling a tank with a liquid, the filling head delimiting a conduit for filling the tank which extends axially along a filling axis from an upstream section which is adapted to receive a filling nozzle, up to a downstream section which is designed to be connected on the tank to fill, and a degassing circuit including an inlet which is adapted to be connected on the tank and an outlet in communication with the outside, the filling head being characterized in that it delimits a suction window which connects the downstream section of the filling conduit on the degassing circuit, so as to promote the suction of the gases via the degassing circuit, during the filling of the tank.