Self-Closing Filling Nozzle With Segmented Bypass Flow
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Solution Overview
Problem
Existing fluid nozzles face challenges in maintaining consistent vacuum generation due to fluctuations in volumetric flow, leading to complex and costly structural designs for reliable automatic switch-off mechanisms.
Innovation Solution
The nozzle incorporates a main channel that splits into a part channel and bypass channels, with a tapered portion and vacuum line, allowing fluid to flow through the part channel predominantly at low flows and the bypass channels at higher flows, decoupling vacuum generation from total volumetric flow and ensuring a consistent vacuum across varying flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the volumetric flow is made variable to adapt to different dispensing requirements, then the adaptability is improved, but the vacuum generation becomes unstable and the device complexity increases
Solution Approach 1:
The main channel is divided into a part channel and bypass channels. The part channel is responsible for vacuum generation while the bypass channels handle excess flow. This segmentation allows the vacuum-generating portion to operate stably even when total flow varies, as the bypass channels absorb flow fluctuations without affecting the part channel's vacuum production.
2Manufacturing precision
If the volumetric flow is reduced to lower costs, then the manufacturing precision requirements decrease, but the vacuum generation becomes insufficient
Solution Approach 1:
By separating the flow path into part and bypass channels, the system can operate at lower overall flow rates while maintaining adequate vacuum generation. The part channel maintains stable, sufficient flow for vacuum production, while the bypass channel handles any additional flow needs. This allows cost-effective manufacturing with relaxed tolerances while ensuring reliable vacuum generation.
3Reliability
If the main channel cross section is reduced to generate vacuum, then the vacuum generation capability is improved, but the flow rate control becomes difficult and device complexity increases
Solution Approach 1:
The channel segmentation allows the part channel to be optimized for vacuum generation with its tapered cross-section, while the bypass channels provide alternative flow paths that simplify overall flow control. The bypass channels act as flow regulators without requiring complex control mechanisms, as they naturally divert excess flow based on pressure differential.
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 maintains a stable vacuum over a wide range of flow rates, simplifying the automatic switch-off mechanism and reducing component tolerance and cost requirements.
Implementation Method 1
a vacuum is generated utilizing the Venturi effect with the aid of the vacuum line which opens into the main channel. The cross section of the main channel is reduced in the region of the main valve, with the result that fluid which flows through the nozzle is accelerated in the region of the main valve, the dynamic pressure increasing and the static pressure decreasing
Data Source
AI summary
The present invention relates to a nozzle for dispensing a fluid, with an inlet (2) for the connection of a fluid feed line, a main channel (16) which connects the inlet (2) to an outlet (25), with a main valve (5) for controlling a total volumetric flow through the main channel (16), and with a vacuum line (9) which opens into the main channel (16). According to the invention, the main channel (16) merges downstream of the main valve (5) into a part channel (10) and into at least one bypass channel (20a-20e) which runs parallel to the part channel (10), the part channel (10) and/or the at least one bypass channel (20a-20e) having means for prioritizing the fluid throughflow, which means are configured in such a way that a relative proportion of the total volumetric flow which flows through the part channel (10) decreases as the total volumetric flow increases, the part channel (10) having a tapered portion (33), and the vacuum line (9) opening in the region of the tapered portion (33) into the part channel (10). The vacuum generation is considerably improved by virtue of the part channel according to the invention, with the result that the reliability of an automatic switch-off device which is loaded by the vacuum is improved.