Valve Cup Frustoconical Bottom Wall Pressurized Container
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Solution Overview
Problem
Current valve cups for pressurized containers, especially aerosol dispensers, face challenges in manufacturing cost and safety when made of polymer, as they can be prone to defective welds leading to part ejection and require complex molds for snap-fastening, which increases material usage and complexity.
Innovation Solution
A valve cup design featuring a frustoconical peripheral portion on the bottom wall for fixing the valve body, with a rolled edge around the central opening to prevent product contact and a metallic outer layer for rigidity, allowing for cost-effective manufacturing and enhanced safety by eliminating the risk of part ejection and simplifying the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cup is made of polymer to eliminate metal parts and facilitate recycling, then environmental friendliness and manufacturing cost are improved, but the risk of defective welds causing part ejection increases
Solution Approach 1:
The invention extracts the problematic welding operation entirely by replacing it with a mechanical interference fit system. The valve body is inserted into the cup through a tapered opening that creates frictional engagement, eliminating the need for welds between polymer parts and thus removing the source of weld defects that could cause part ejection.
Solution Approach 2:
The tapered opening acts as an intermediary mechanism between the valve body and cup. Instead of directly joining parts through welding, the tapered geometry provides a gradual transition zone that guides the valve body into position and creates a secure mechanical connection through friction and interference fit.
2Ease of operation
If snap-fastening is used to fix the valve body to the cup, then assembly is simplified, but mold complexity and material usage increase
Solution Approach 1:
The invention extracts the complex snap-fastening mechanism and replaces it with a simple tapered interference fit. This eliminates the need for separate snap-fastening tabs, recesses, and corresponding mold features, significantly simplifying both the device structure and the molding process while maintaining easy assembly through a single insertion motion.
Solution Approach 2:
Instead of using positive engagement features like snap-fastening tabs that protrude outward, the invention uses a negative engagement approach where the tapered opening itself creates the retention force. The valve body is retained by the friction and interference of the tapered geometry rather than by separate mechanical fasteners.
Data Source
AI summary
The valve cup for pressurized container has an outer face and an inner face and is provided with a peripheral bearing edge (51) for placing the cup on a can, a central opening for the passage of a product outlet rod (31), a descending wall in the continuation of the bearing edge, and a bottom wall between the descending wall and the central opening, which bottom wall comprises at least one frustoconical peripheral portion the outer face of which is concave.