Canister Flush Valve Seal Geometry and Float Bleed Design
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Solution Overview
Problem
Conventional canister flush valves face issues with maintaining a tight seal at the tank outlet, leading to water leakage and inefficient water consumption due to suboptimal float/seal interface and closure timing control.
Innovation Solution
The improved canister flush valve features a float with a compound profile seal retaining portion and angled bleed openings to reduce leakage and control closure timing, utilizing a flexible seal and a radially extending seal backing flange for enhanced sealing and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional canister flush valve uses a simple seal interface between the float and seal, then the device complexity is reduced, but leakage occurs over time due to seal degradation or shrinkage
Solution Approach 1:
The patent introduces a circumferential groove at an angle to the longitudinal axis of the float, creating a three-dimensional seal interface. This angled groove configuration transforms the traditional linear seal contact into a multi-dimensional sealing path, preventing water leakage through the float/seal interface by blocking the leak path that forms when seals degrade or shrink over time.
Solution Approach 2:
The patent applies a compound profile seal retaining portion with specific geometric features (angled groove, circumferential groove) at the critical seal interface location. This localized structural enhancement provides improved sealing characteristics exactly where needed - at the float/seal interface - without requiring complex changes throughout the entire float structure.
2Loss of substance
If the float closure timing is not controlled, then the device complexity is minimized, but water consumption increases due to extended valve open duration
Solution Approach 1:
The patent incorporates bleed openings in the float that allow controlled water flow into the float's hollow body during the flush cycle. This dynamic mechanism automatically adjusts the float's weight as water enters, creating a time-dependent closure behavior. The float progressively sinks as water fills the hollow body, ensuring timely valve closure without requiring external control mechanisms.
Solution Approach 2:
The float structure uses its own hollow body and integrated bleed openings to automatically control closure timing. The system self-regulates by allowing water to enter the float during flushing, naturally increasing its weight and triggering closure when sufficient water has been discharged, eliminating the need for separate timing control devices.
3Productivity
If bleed openings are provided in the float bottom wall, then closure timing is controlled, but water sprays up through the float against the tank lid
Solution Approach 1:
The patent angles the bleed openings relative to the longitudinal axis of the float rather than having them perpendicular to the bottom wall. This angular orientation changes the direction of water flow through the openings, directing water along a path that does not spray upward against the tank lid, thereby eliminating the harmful spray effect while maintaining closure timing control.
Solution Approach 2:
The bleed openings are configured with asymmetric geometry - angled relative to the float axis and positioned at specific locations. This asymmetric design creates a controlled water flow pattern that directs water in a specific direction during the flushing process, preventing the symmetric upward spray that would occur with conventional perpendicular openings.
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 solution effectively minimizes leakage and optimizes water consumption by ensuring a tight seal and precise control over valve closure, reducing water wastage and noise.
Implementation Method 1
the hollow body acts to restrict flow of water into the hollow body of the float during a flush cycle such that the hollow body suspends above the valve seat at least temporarily during the flush cycle by a buoyancy force of the water acting on an outside of the hollow body
Data Source
AI summary
A canister type flush valve has an upright cup-shaped hollow float working under buoyancy forces without a captured air volume that controls the valve during a flush cycle. Hooded bleed openings at a bottom wall of the float can be sized and numbered to selectively control the closuring timing of the valve. Baffles of the hood bleed openings redirect water bleeding into the float to prevent the water from spraying up against the top of the tank. The geometry of a seal retaining groove is designed to reduce leakage at the float/seal interface. For example, the groove has an annular wall with a compound profile forming a non-cylindrical, preferably serpentine, seal contact area. The seal is backed by a slotted flange located just above the retaining groove.