Suction head with a rotating brush with a cleaning blade
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Solution Overview
Problem
Vacuum cleaners with rotating brushes struggle to effectively collect dust particles from carpets due to tangential speeds and offset angles of bristles and cleaning blades, leading to inefficient cleaning performance.
Innovation Solution
A suction head design with a rotating brush and cleaning blade, where the cleaning blade is angularly offset relative to the bristles, and the brush diameter and rotation speed are optimized to achieve a tangential speed ratio between 2.5 and 3.5, ensuring efficient capture of dust particles projected into the air by the bristles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the brush diameter and rotation speed are increased to improve dust collection, then the cleaning performance improves, but the suction head cannot pass under low furniture
Solution Approach 1:
The cleaning blade performs preliminary action by projecting dust particles toward the suction inlet before the bristles complete their scraping motion. This anticipatory positioning of dust particles ensures they are captured in the suction flow before gravity can cause them to fall back, resolving the contradiction between effective dust collection and compact brush dimensions.
Solution Approach 2:
The system utilizes dynamic timing relationships between the rotating bristles and cleaning blade, with the blade positioned at a specific angular offset (20-90 degrees) to create optimal dust projection timing. This dynamic coordination allows compact brush dimensions while maintaining high dust collection efficiency through precisely timed particle projection into the suction path.
2Productivity
If the cleaning blade is positioned at a large offset angle to capture dust, then dust collection improves, but dust particles fall back onto the floor before being captured
Solution Approach 1:
The cleaning blade is positioned to perform preliminary projection of dust particles toward the suction inlet during the bristle scraping phase. This preliminary action occurs at an optimal angular offset that projects dust into the suction path before gravity causes fallback, capturing particles that would otherwise be lost.
Solution Approach 2:
The system optimizes the angular offset parameter between the cleaning blade and bristles (set between 20-90 degrees) to achieve the critical balance where dust particles are projected into the suction flow at the precise moment when they can be captured before falling back. This parameter optimization resolves the timing contradiction between dust projection and capture.
3Productivity
If the rotation speed is increased to improve dust projection, then cleaning performance improves, but the tangential speed becomes too high causing dust to be projected behind the protective slat
Solution Approach 1:
The system optimizes the rotation speed parameter within a specific range (2000-8000 rpm) to achieve the critical tangential velocity where dust particles are projected with sufficient force toward the suction inlet but not so high that they overshoot behind the protective slat. This parameter optimization ensures reliable dust capture while maintaining effective dust projection.
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 optimized design significantly increases the quantity of dust collected by the suction head, improving cleaning performance by effectively capturing dust particles that would otherwise fall or be missed.
Implementation Method 1
The main function of the row of bristles is to scrape the floor to be cleaned
Implementation Method 2
dust particles contained in the carpet are thrown by the bristles of the pile row towards the suction inlet
Implementation Method 3
dust particles contained in the carpet are thrown by the bristles of the pile row towards the suction inlet and are thus sucked up by the vacuum cleaner
Implementation Method 4
the dust particles, projected by the carpet fibres after the scraping action, are likely to fall back by gravity onto the floor
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The suction head (2) comprises a main body (4); a rotating brush (11) housed in the main body (4) and comprising a brush body (12) configured to be driven in rotation in a predetermined direction of rotation and around an axis of rotation, a row of bristles (14) provided on an external peripheral surface of the brush body (12), and a cleaning blade (15) provided on the external peripheral surface of the brush body (12), the cleaning blade (15) being angularly offset from the row of bristles (14) with respect to a central longitudinal axis (A) of the brush body (12) by an offset angle and being located at the rear of the row of bristles (14) with respect to the predetermined direction of rotation of the brush body (12).