Squeegee Seal Flap Design for Uneven-Surface Vacuum Retention
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Solution Overview
Problem
Traditional squeegee assemblies in scrubber-dryer machines fail to maintain an effective seal with uneven surfaces, leading to loss of vacuum pressure and incomplete removal of dirty water and surfactant, resulting in reduced cleaning efficiency and premature squeegee wear.
Innovation Solution
The squeegee assembly features flexible seal flaps within channels on the front squeegee that can move between open and closed positions, ensuring air, dirty water, and surfactant can enter the vacuum chamber while maintaining a seal with the floor, even on uneven surfaces by closing when contact is lost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the squeegee lower edge maintains a fixed linear seal with the floor, then the seal is effective on flat surfaces, but the seal breaks on uneven surfaces causing vacuum pressure loss
Solution Approach 1:
The seal flap is made movable between a closed position (engaging the floor to maintain seal) and an open position (allowing fluid entry). This dynamic mechanism allows the squeegee to adapt to uneven surfaces while maintaining vacuum seal integrity, resolving the contradiction between seal reliability and adaptability.
Solution Approach 2:
The seal flap is constructed as a flexible component that can deflect and adapt to floor irregularities. This flexibility allows the seal to maintain contact with uneven surfaces while still providing an effective barrier, addressing both seal effectiveness and surface adaptability.
2Device complexity
If the front squeegee channels are fixed in size and configuration, then the structure is simple, but the vacuum performance degrades as the squeegee wears
Solution Approach 1:
The seal flap provides a dynamic sealing solution that compensates for wear in the fixed channel structure. As the squeegee wears, the adjustable seal flap position maintains the vacuum seal, preventing performance degradation while keeping the channel structure simple.
Solution Approach 2:
The seal flap can change its position and sealing parameters in response to wear and floor conditions. This parameter adjustment maintains vacuum performance consistency despite the fixed channel structure and wear over time.
3Reliability
If the seal flap remains closed to maintain vacuum seal, then vacuum pressure is maintained, but dirty water and surfactant cannot enter the vacuum chamber
Solution Approach 1:
The seal flap dynamically transitions between closed and open positions based on operating conditions. It remains closed to maintain vacuum seal on flat surfaces but opens to allow fluid entry when needed, resolving the contradiction between vacuum maintenance and fluid pickup efficiency.
Solution Approach 2:
The seal flap automatically responds to floor conditions and vacuum pressure changes, opening when fluid needs to enter and closing when seal integrity is required. This self-regulating mechanism eliminates the need for external control while maintaining both vacuum pressure and productivity.
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
This design enhances vacuum performance over uneven surfaces and extends the life of the squeegees by maintaining a seal and reducing vacuum pressure loss, ensuring consistent cleaning efficiency throughout the squeegee's lifespan.
Implementation Method 1
the dirty water is drawn by a vacuum from the vacuum chamber to a dirty water tank for subsequent disposal
Data Source
AI summary
The present invention relates generally to a surface cleaning squeegee assembly and more specifically to a squeegee assembly mounted on a scrubber-dryer floor cleaning machine. The squeegee assembly includes a front squeegee having a number of spaced channels along a lower edge covered by seal flaps, and a rear squeegee having no channels. The front and rear squeegees define a vacuum chamber between them. Air, dirty water and surfactant are vacuumed into the vacuum chamber through the front squeegee channels for ultimate disposal. When the scrubber-dryer surface cleaning machine traverses over an uneven surface, the seal flaps close the channels to limit or eliminate any vacuum loss to the vacuum chamber.