A cleaner head for a vacuum cleaner
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Solution Overview
Problem
Vacuum cleaner brush bars often fail due to debris like hair or threads wrapping around them, leading to increased torque and reduced pick-up performance, as existing designs do not effectively manage the migration and release of long strands during operation.
Innovation Solution
A cleaner head with a conical agitator and strategically positioned air outlets encourages debris to migrate towards the free end, where it can be released, and an agitator engaging member applies pressure to promote debris migration, preventing re-wrapping and ensuring efficient debris removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional cylindrical brush bar is used, then the vacuum cleaner can effectively agitate carpet fibres and lift dust, but long strands of debris become wrapped around the brush bar leading to increased torque and potential failure
Solution Approach 1:
The brush bar is designed with a conical shape instead of a traditional cylindrical form, creating an asymmetric geometry where the diameter varies along the length. This asymmetry causes debris to migrate toward the smaller diameter end due to reduced circumference, preventing wrap-around and maintaining reliability while preserving cleaning effectiveness
2Productivity
If the brush bar rotates to sweep dust rearwardly into the suction cavity, then dust pick-up performance is improved, but debris wraps around the rotating brush bar increasing torque requirements
Solution Approach 1:
The conical shape creates asymmetric debris interaction where the varying circumference along the brush bar length causes strands to naturally migrate toward the smaller end during rotation, reducing the torque required to maintain rotation and preventing the build-up that leads to failure
3Device complexity
If debris is allowed to accumulate on the brush bar, then the brush bar structure remains simple, but pick-up performance is reduced due to increased torque and potential failure
Solution Approach 1:
The conical geometry provides a self-cleaning mechanism where debris naturally migrates to the smaller diameter end and is prevented from accumulating, maintaining simple structure without additional components while preserving consistent pick-up performance throughout operation
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 conical shape and air outlet configuration effectively manage debris migration, reducing the risk of brush bar failure and enhancing cleaning performance by ensuring debris is released and conveyed away efficiently, thereby maintaining pick-up performance.
Implementation Method 1
the conical shape of the agitator to encourage debris which has become wrapped around the agitator to migrate along the agitator towards the free end
Implementation Method 2
the suction cavity comprises an air outlet located adjacent the free end of the agitator. An airflow, into which debris which has been released from the agitator generally becomes entrained, passes along an airflow path extending from the air outlet towards an outlet of the cleaner head
Data Source
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AI summary
A cleaner head for a vacuum cleaner includes a suction cavity having an opening through which debris enters the cleaner head, and an air outlet, and an agitator mounted in the suction cavity in a cantilevered manner for rotation relative thereto. The agitator is conical in shape and has a first, free end and a second end which has a larger diameter than the first end. The air outlet is located adjacent the free end of the agitator.