Cleaner Head Rear Seal for Uneven Floor Suction Sealing
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Solution Overview
Problem
Vacuum cleaners experience reduced pickup performance due to the reduction in pressure differential when the cleaner head is moved over uneven surfaces, as it may lift away from the surface during strokes, particularly on textured hard surfaces or floor transitions.
Innovation Solution
A cleaner head with a hollow deformable seal extending from the rear of the housing, made of resilient material like thermoplastic polyurethane, which biases against the surface to maintain a pressure differential by conforming to the floor and reducing the likelihood of lifting, ensuring a consistent seal across the cleaner head's width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cleaner head is moved across the surface in forwards and backwards strokes, then the cleaner head can cover the cleaning area, but the cleaner head may be partially lifted away from the surface during each stroke, reducing the pressure differential and pickup performance
Solution Approach 1:
The patent employs a flexible seal element that can deform and conform to the surface being cleaned. This flexible seal maintains contact with the surface even when the cleaner head is moved across it, preventing air leakage and maintaining the pressure differential necessary for effective pickup performance while allowing the head to traverse the cleaning area.
Solution Approach 2:
The seal element is designed to be dynamically responsive to surface variations and movement forces. It can deform elastically to accommodate surface irregularities and maintain sealing contact during the dynamic motion of the cleaner head, rather than being a rigid fixed structure.
2Adaptability or versatility
If the cleaner head travels over uneven surfaces such as heavily textured hard surfaces or floor transitions, then the cleaner head can adapt to the surface variations, but the separation between the cleaner head and surface increases, significantly reducing the pressure differential
Solution Approach 1:
The flexible seal element can deform to conform to uneven surfaces including heavily textured hard surfaces and floor transitions. This flexibility allows the seal to maintain contact with the surface across various topographies, adapting to surface variations while preventing air leakage that would reduce the pressure differential.
Solution Approach 2:
The seal element's physical parameters such as its shape and position can change in response to surface variations. The material properties and geometric configuration of the seal are designed to allow these parameter changes while maintaining sealing effectiveness across different surface conditions.
3Device complexity
If a rigid seal is used to maintain the pressure differential, then the seal structure is simple, but the seal cannot conform to uneven surfaces, causing separation and reduced pickup performance
Solution Approach 1:
The patent replaces a rigid seal structure with a flexible seal element that can deform to match the surface profile. This flexible seal maintains sealing effectiveness on uneven surfaces while keeping the overall structure relatively simple, avoiding the need for complex adjustment mechanisms.
Solution Approach 2:
The seal element's geometric parameters can change in response to surface variations, allowing it to conform to uneven surfaces. This dynamic parameter adjustment occurs passively through material deformation rather than active control, maintaining simplicity while improving sealing reliability.
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 deformable seal effectively maintains a pressure differential, enhancing dirt and dust pickup performance on uneven surfaces by providing a consistent downward force and conforming to the floor, even when encountering obstacles like debris or rug edges.
Implementation Method 1
The hollow deformable seal may be formed of a resilient material. This allows the seal to return to its original position and to provide a biasing force against the floor surface without requiring a separate biasing means
Data Source
AI summary
A cleaner head for a cleaning appliance, the cleaner head comprising: a housing defining a suction chamber; and a sole plate defining a downwardly-directed opening through which dirt can enter the suction chamber. The cleaner head further comprises a hollow deformable seal extending from a rear portion of the housing, the hollow deformable seal having a width at least equal to a width of the opening in the sole plate, and having a lower sealing surface that extends in a downward and rearward direction from a rear edge of the housing such that, in use, the hollow deformable seal is biased against and conforms to a surface being cleaned in order to maintain a seal between the cleaner head and the surface being cleaned.