Hyperbolic Paraboloid Grate Cover for Swimming Pool Drain Safety
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Solution Overview
Problem
Existing drain systems for swimming pools, spas, and whirlpool baths face challenges in ensuring safety by preventing limb entrapment while maintaining water flow, as increased water flow speed creates significant suction that can trap users, and existing solutions like suction sensors may not react quickly enough to prevent injuries.
Innovation Solution
A quadratic surface grate cover with a hyperbolic paraboloid frame and trapezoid-shaped vented portions that flex to prevent body contact with suction, ensuring no part of the body can be entrapped and allowing for increased water flow without turbulence, made from materials like plastic composite or metals for strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water flow speed is increased to improve circulation efficiency, then productivity is improved, but the suction force increases causing entrapment hazards
Solution Approach 1:
The patent applies a curved surface design to the grate cover, specifically a hyperbolic paraboloid shape, which eliminates flat surfaces that could create suction points. The curvature ensures that water flow passes over and around the grate without creating concentrated suction zones that could entrap body parts, thus maintaining high water circulation efficiency while eliminating entrapment hazards.
Solution Approach 2:
The grate cover incorporates flexible elements that can deflect under suction forces, preventing the formation of rigid flat surfaces where entrapment could occur. The flexibility allows the grate to conform to pressure differentials without creating dangerous suction points, maintaining both high flow efficiency and safety.
2Reliability
If a sensor-based suction cutoff system is installed to prevent entrapment, then safety is improved, but the response time is too slow causing injuries before shutdown
Solution Approach 1:
The patent implements preliminary action by designing the grate cover geometry itself to prevent entrapment before suction forces can act on body parts. The curved surface configuration proactively eliminates the formation of dangerous suction zones, providing immediate protection without requiring detection and response time.
Solution Approach 2:
The patent converts the potentially harmful suction force into a beneficial flow pattern by using the curved grate surface to guide water flow smoothly over the opening. The suction force that would normally cause entrapment is redirected along the curved surface, maintaining circulation efficiency while preventing contact between body parts and the suction zone.
3Reliability
If an unblockable grate cover is installed to prevent entrapment, then safety is improved, but water flow restriction increases
Solution Approach 1:
The curved hyperbolic paraboloid surface of the grate cover optimizes water flow by eliminating dead zones and promoting smooth, continuous flow patterns. The curvature guides water efficiently over the grate opening, maintaining high flow rates while the curved geometry itself prevents entrapment by avoiding flat surfaces where suction could concentrate.
Data Source
AI summary
A quadratic surface grate cover for a swimming pool including a hyperbolic paraboloid shaped frame having front side, a back side, a top side that runs parallel to a bottom side and two non-parallel ends that connect the top and bottom sides. The quadratic surface grate includes at least four trapezoid-shaped vented portions positioned within and across the frame so that the frame and the trapezoid-shaped portions flex in a concave direction between the two non-parallel ends and a convex direction between the two parallel sides.