Handheld Cyclone Vacuum Filter Layout for Motor Protection
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Solution Overview
Problem
Handheld vacuum cleaners with cyclonic separators can still allow dust to enter the motor, potentially damaging it, and existing designs may not efficiently protect the motor while maintaining operational efficiency.
Innovation Solution
A handheld vacuum cleaner design where the body and separator are releasably connected, housing a filter upstream of the fan and motor, with the filter area being significantly larger than the airflow path to minimize pressure drop and facilitate maintenance, ensuring the motor is protected without affecting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is placed upstream of the motor to protect it from dust, then motor protection is improved, but pressure drop increases and efficiency decreases
Solution Approach 1:
The filter area is increased by utilizing the chamber space in a different dimensional arrangement. The filter is positioned within a chamber formed by the body and separator, allowing the filter area to be at least three times, preferably at least five times, the cross-sectional area of the dirty air inlet. This dimensional expansion of the filter area reduces the pressure drop while maintaining motor protection.
2Productivity
If a large area filter is used to minimize pressure drop, then operational efficiency is improved, but the overall size of the appliance increases
Solution Approach 1:
The filter is nested within the chamber that is formed partly by the body and partly by the separator. This nesting arrangement allows the large area filter to be accommodated within the existing appliance structure without significantly increasing the overall size. The filter is housed in the chamber space, effectively utilizing the available volume.
Solution Approach 2:
The filter area is expanded by utilizing the chamber space in a different dimensional arrangement. The filter is positioned within a chamber formed by the body and separator, allowing the filter area to be at least three times, preferably at least five times, the cross-sectional area of the dirty air inlet. This dimensional expansion of the filter area reduces the pressure drop while maintaining motor protection.
3Reliability
If the filter is positioned within the appliance body, then motor protection is improved, but maintenance accessibility deteriorates
Solution Approach 1:
The appliance is segmented into separable components: the body, the separator, and the filter. The separator can be removed from the body, providing access to the filter for maintenance. This segmentation allows the filter to be protected within the appliance structure while remaining easily accessible for regular cleaning or replacement.
Solution Approach 2:
The connection between the body and separator is made dynamic and reversible rather than fixed. The separator is releasably connected to the body, allowing it to be removed for filter maintenance and reattached when needed. This dynamic connection enables easy access to the filter while maintaining motor protection during 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 design effectively prevents dust from entering the motor, reduces the pressure drop across the filter, and enhances maintenance accessibility, thereby protecting the motor and maintaining efficient operation.
Implementation Method 1
a separation device such as a filter or bag for separating dirt and dust from the incoming airflow. Examples of such a device is sold by Black & Decker under the trade name DUSTBUSTER®. A further example of a handheld vacuum cleaner incorporating a cyclonic separator is shown in GB2035787A.
Implementation Method 2
a separation device such as a filter or bag for separating dirt and dust from the incoming airflow
Data Source
AI summary
A handheld cleaning appliance includes a dirty air inlet, a clean air outlet and separating apparatus for separating dirt and dust from an airflow in an airflow path leading from the air inlet to the air outlet. The appliance also includes a body housing a fan and motor for drawing air into the appliance via the dirty air inlet. The separator includes at least one cyclone. The separator and the body are releasably connected together around a chamber in the airflow path which is formed partly by the body and partly by the separator, the chamber housing a filter which is located upstream of the fan and motor and downstream of the cyclone.