Filler Head Venting Structure to Prevent Refilling Spit-Back
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Solution Overview
Problem
Existing filler heads for fluid tanks, particularly those used in SCR systems, experience fluid spitting during refilling due to pressure imbalances, which can lead to inefficient filling and potential overfilling, especially when using automatic nozzles with varying sensor configurations.
Innovation Solution
A filler head design featuring a separating device with notches in its cylindrical wall to improve pressure balance and fluid circulation, connected to both filling and venting lines, and incorporating a buffer volume to reduce flow speed and prevent spitting, along with a securing element to enhance auto-stop nozzle shut-off sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separating device with notches is added to improve pressure balance, then fluid spitting is prevented, but device complexity increases
Solution Approach 1:
The separating device is divided into multiple notches (typically 2-4 notches) around its circumference, creating segmented flow paths that distribute and balance pressure evenly throughout the filler head cavity, preventing localized pressure imbalances that cause spitting
Solution Approach 2:
The separating device acts as an intermediary component between the venting line and the filling line, using the notches to mediate pressure transmission and create a balanced pressure distribution that prevents fluid spitting while allowing both lines to function independently
2Loss of time
If the auto-stop sensor is mounted upstream from the nozzle tip, then sensing time is reduced, but filling precision may be compromised
Solution Approach 1:
The auto-stop sensor is positioned upstream of the nozzle tip to detect fluid presence before the fluid actually reaches the nozzle, allowing the filling system to initiate shut-off sequences in advance, thereby reducing the loss of time during the auto-stop sensing phase while maintaining filling precision through controlled shut-off timing
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 effectively prevents fluid spitting from the filler head during auto-stop nozzle shut-off and allows quicker sensing of the auto-stop sensor, ensuring reliable and efficient refilling across a range of filling rates and tank volumes.
Implementation Method 1
the at least one notch improving, when the nozzle is received in the cylindrical wall of the separating device, the pressure balance in the filler head so as to ensure that the fluid outgoing from the nozzle has limited possibility to spit back
Implementation Method 2
A buffer volume may be configured to be connected to the venting line and to reduce the speed of flow coming from the venting line
Data Source
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AI summary
The invention relates to a filler head (13) comprising a body (15) including a main part (17) closed by a cover part so as to form a cavity in which a separating device (21) is received, the top end (21A) of the separating device (21) facing the cover part of the body (15) comprises at least one notch (22) improving, when the distribution nozzle is received in the separating device (21), the pressure balance in the filler head (13) so as to ensure that the fluid outgoing from the nozzle has limited possibility to spit back from the filler head (13) during the auto-stop nozzle shut off.