Pump Valve Stiffness via Segmented Stem and Conical Seal
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Solution Overview
Problem
The rigidity or stiffness of existing valve components in pump devices affects their performance and assembly, leading to suboptimal operation in personal and beauty care pumps.
Innovation Solution
The design includes a thicker or geometrically shaped valve stem with a conical outlet valve and support ribs, which provides increased stiffness and a conical shape for improved sealing and stability, matching the discharge passage for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional valve stem design is used, then the valve assembly is simpler and easier to manufacture, but the valve lacks sufficient stiffness and rigidity, impacting pump performance
Solution Approach 1:
The valve stem is segmented into multiple functional zones: an expanded upper portion with geometric cross-section for stiffness, a tapered intermediate section for stress distribution, and a lower section for actuation. This segmentation allows each portion to be optimized for its specific function while maintaining overall structural integrity.
Solution Approach 2:
The valve stem employs local quality by providing different cross-sectional geometries at different locations - the upper portion has a geometric cross-section (square, rectangular, or star-shaped) for maximum stiffness, while the lower portion is optimized for actuation. This localized differentiation achieves high stiffness where needed without unnecessarily complicating the entire structure.
2Strength
If a thicker valve stem is used to increase stiffness, then the rigidity improves, but the valve becomes more difficult to assemble and may interfere with surrounding pump components
Solution Approach 1:
The valve stem incorporates a tapered section that transitions from the expanded upper portion to the lower actuation section. This dynamic geometry allows the stem to be stiff where needed while gradually reducing dimensions to fit through pump components during assembly, resolving the conflict between rigidity and ease of installation.
Solution Approach 2:
The valve stem utilizes dimensional transitions by expanding in the radial direction at the upper portion for stiffness, then tapering down toward the actuation end. This dimensional variation allows the stem to achieve high rigidity in critical areas while maintaining compatibility with the pump's spatial constraints and assembly requirements.
3Reliability
If a conical outlet valve is used, then the sealing performance and product discharge control are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The outlet valve is constructed as a composite structure combining a conical sealing surface with an integrated stem. This composite design allows the conical portion to be precisely formed as part of a single molded or machined component, reducing the need for separate high-precision assemblies and making the required manufacturing precision more achievable through modern manufacturing processes.
Data Source
AI summary
Improved, rigid valves for pumps include ribs or other support structures, increased diameters and cross-sectional areas, and conically shaped outlet valves.