Pre-Motor Filter Layout for Hand Vacuum Airflow Retention
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Solution Overview
Problem
Hand surface cleaning apparatuses face a reduction in airflow and suction performance due to the clogging of pre-motor filters, which shortens their operational time and affects cleaning efficiency, and increasing the suction motor size to counter this increases the unit's weight.
Innovation Solution
A pre-motor filter with an enhanced surface area is positioned to overlay parts of the suction motor and cyclone chamber, increasing the upstream filtration capacity without significantly increasing the device's size, thereby extending the filter's life and maintaining airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the pre-motor filter surface area is increased to extend filter life and maintain airflow, then the filter capacity is improved, but the device size increases
Solution Approach 1:
The pre-motor filter is configured to overlie the cyclone chamber, extending the filtration surface into the vertical space above the cyclone rather than only horizontally. This dimensional extension allows increased filter surface area without proportionally increasing the device footprint, as the filter utilizes the vertical volume above the cyclone chamber effectively.
Solution Approach 2:
The pre-motor filter is positioned to overlie both the suction motor and the cyclone chamber, nesting the filtration function within the existing structural volume. The filter is integrated into the housing space that already contains these components, allowing the filter surface to extend over multiple components without requiring additional external volume.
2Productivity
If a larger suction motor is provided to counter HEPA filter airflow reduction, then the airflow performance is improved, but the hand weight increases
Solution Approach 1:
The pre-motor filter is positioned upstream of the suction motor to perform preliminary filtration of the air before it reaches the motor. By removing particulate matter earlier in the airflow path, the filter protects the suction motor from contamination and reduces the load on the motor, allowing a smaller motor to maintain the required airflow performance.
Solution Approach 2:
The pre-motor filter acts as an intermediary between the cyclone chamber and the suction motor, capturing particulate matter that would otherwise accumulate on the motor. This intermediate filtration step protects the motor and maintains airflow efficiency without requiring the motor to be oversized to compensate for contamination-related performance degradation.
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 configuration enhances the operational time of the hand surface cleaning apparatus by reducing clogging and maintaining airflow, improving cleaning performance without increasing the unit's weight.
Implementation Method 1
A pre-motor filter with enhanced surface area transverse to the direction of air flow is provided
Implementation Method 2
The air is drawn into the vacuum cleaner through a dirty air inlet and conveyed to a cyclone inlet. The rotation of the air in the cyclone chamber results in some of the particulate matter in the airflow stream being disentrained from the airflow stream.
Data Source
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AI summary
A surface cleaning apparatus comprises an air flow passage extending from a dirty air inlet to a clean air outlet. A suction motor is positioned in the air flow path. At least one cyclone chamber positioned in the air flow path. An associated dirt collection chamber is optionally exterior the cyclone chamber. A pre-motor filter is positioned downstream of the cyclone chamber and upstream of the suction motor. The pre-motor filter has an upstream side and a downstream side. The pre-motor filter may overlie at least a portion of the suction motor and the cyclone chamber.