Rounded Shaft Fluidic Control Element for Sealing Sheath Integrity
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Solution Overview
Problem
Existing fluidic control elements, particularly in magnet valves, face issues with the longevity of the sealing sheath due to high loads on sharp-edged shafts passing through the sealing ring, leading to potential tearing over time.
Innovation Solution
The fluidic control element features a rounded shaft design with no sharp edges or corners, embedded in an elastic sealing sheath, and optionally a multi-layered core with a load-carrying inner part and a plastic cladding, ensuring secure embedding and preventing gaps during swiveling, along with a self-reinforcing sealing geometry using beads for enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a sharp-edged shaft is used to achieve good embedding in the sealing sheath, then the embedding quality is improved, but the sealing sheath may tear over time due to high loads
Solution Approach 1:
The shaft is designed with a rounded cross-section instead of sharp edges, specifically with a curvature radius of 0.5mm to 2mm. This rounded geometry prevents stress concentration and eliminates tearing of the sealing sheath while maintaining adequate embedding quality through the rounded surface contact.
2Reliability
If the shaft is rounded to prevent tearing of the sealing sheath, then the product life is extended, but the embedding security may be reduced
Solution Approach 1:
The curvature radius of the rounded shaft is optimized within a specific range of 0.5mm to 2mm. This parameter optimization ensures that the shaft is rounded enough to prevent tearing while maintaining sufficient surface area and geometric interlocking for secure embedding in the sealing sheath.
3Reliability
If a multi-layered core with plastic cladding is used to secure embedding and prevent gaps, then the sealing reliability is improved, but the device complexity increases
Solution Approach 1:
The core is constructed as a composite structure with an inner load-carrying part (metal or rigid material) and an outer plastic cladding layer. This composite design combines the strength of the inner core with the sealing and embedding properties of the plastic cladding, preventing gaps between the shaft and sealing sheath while distributing stresses effectively.
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 rounded shaft design and self-reinforcing sealing geometry significantly extend the product life by preventing tearing of the sealing sheath and ensuring reliable fluid control, while maintaining precise fluid flow management.
Implementation Method 1
Upon swiveling the lever, the elastic sealing sheath is deformed so that it provides for a restoring force.
Data Source
AI summary
A fluidic control element includes a housing having a fluid space formed between at least two housing parts. First and second flow channels may each have a sealing seat that opens into the fluid space. The fluidic control element may further include a two-armed lever which is configured to swivel in the fluid space. Each arm of the lever may be configured to open and close one of the flow channels in a corresponding end position. Additionally, a valve body may have a load-carrying core including a shaft mounted in the housing. The shaft may be rounded at least in the region in which it is embedded in a sealing ring that surrounds the lever arms.