Vacuum Cleaner Brush With Alternating Blades Against Thread Wrapping
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Solution Overview
Problem
Existing rotating brushes for vacuum cleaners face issues with thread ends wrapping around the brush, leading to reduced suction performance and the need for frequent cleaning, especially at high speeds and during prolonged use.
Innovation Solution
A vacuum cleaner nozzle brush design featuring a cylindrical shaft with alternately mounted blades, where one blade has a succession of recessed parts and teeth, and the other has a concave recessed part, reduces thread end wrapping by alternating these blade types to concentrate suction force and prevent thread accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a blade type brush with recessed parts and teeth is used, then thread end wrapping is reduced, but thread end wrapping reappears at high rotation speeds (3000-6000 rpm) and during prolonged use
Solution Approach 1:
The brush is divided into multiple identical modular units, each comprising a shaft with two alternately arranged blades. This segmentation allows the brush to maintain its thread-end-preventing function across the entire rotating surface while distributing the mechanical stress evenly, preventing performance degradation during prolonged high-speed operation.
Solution Approach 2:
Each blade is equipped with specifically designed local features: one blade has a concave recessed part while the other has convex teeth. These localized structural variations create alternating zones that effectively prevent thread end wrapping at different angular positions, ensuring consistent performance throughout the rotation cycle even at high speeds.
2Object-generated harmful factors
If blades with recessed parts and teeth are used, then thread wrapping is reduced, but suction performance is lost and frequent cleaning is required
Solution Approach 1:
The invention merges the functions of thread prevention and dust collection into a single integrated blade structure. The blades with recessed parts and teeth simultaneously perform both functions: preventing thread wrapping through their geometric features and collecting dust through their contact with the surface, eliminating the need for separate cleaning operations.
Solution Approach 2:
The alternating arrangement of blades with recessed parts and teeth ensures continuous effective action around the entire shaft circumference. As the shaft rotates, these alternating blade types continuously interact with thread ends and dust particles, maintaining constant prevention and collection functions without interruption or performance loss.
3Object-generated harmful factors
If multiple blades are mounted on the shaft, then thread wrapping is minimized, but torque requirements increase
Solution Approach 1:
The invention employs asymmetric blade design where one blade features a concave recessed part and the other features convex teeth. This asymmetric configuration creates alternating zones of reduced and increased friction during rotation, allowing the brush to effectively prevent thread wrapping while maintaining manageable torque requirements through the alternating friction pattern.
Data Source
Figure 1
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Figure 5~6
AI summary
The invention concerns a brush (1) for a vacuum cleaner nozzle comprising a shaft (4) having an axis (9) of rotation, and at least two blades (6,7) mounted on the shaft (4) by an attachment edge (21, 22) of the blades (6, 7), and the blades (6, 7) each comprise a free edge (14, 15). The invention is characterised in that the free edges (14, 15) of the blades (6, 7) are alternately and regularly different from each other.