Cyclone Pre-Motor Filter Layout for Low Pressure Drop
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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 solutions may compromise efficiency when trying to protect the motor with a filter.
Innovation Solution
A cyclonic handheld cleaning appliance with a body and separator that are releasably connected, housing a filter upstream of the fan and motor, allowing for a larger filter area relative to the airflow path without increasing the appliance's size, and ensuring easy maintenance.
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 is positioned perpendicular to the main airflow path, with its upstream surface substantially perpendicular to the direction of airflow. This orientation allows the filter to present a large surface area to the airflow without creating excessive pressure drop, as the air flows parallel to the filter surface rather than directly through a narrow filter area. The filter upstream surface area is at least three times, preferably at least five times, the cross-sectional area of the dirty air inlet.
2Productivity
If a filter with large area is provided upstream of the motor, then pressure drop is minimized, but the appliance size increases
Solution Approach 1:
The filter is oriented with its upstream surface substantially perpendicular to the direction of airflow, utilizing the lateral dimension rather than extending the length of the appliance. This allows a large filter area to be achieved without increasing the overall appliance volume, as the filter integrates into the existing housing structure rather than requiring additional length.
Solution Approach 2:
The filter is integrated within the existing housing structure of the cyclonic vacuum cleaner, nesting the filter element within the available internal volume. The filter upstream surface is positioned within the housing such that it does not protrude significantly, allowing the large filter area to be accommodated within the existing appliance envelope.
3Reliability
If the filter is positioned upstream of the motor, then motor protection is improved, but filter maintenance becomes more difficult
Solution Approach 1:
The housing is divided into a first part containing the cyclone and a second part containing the motor, with the filter positioned at the interface between these segments. The filter can be accessed by separating these housing parts, making maintenance easier while still maintaining its protective position upstream of the motor.
Solution Approach 2:
The filter is designed as a separate, removable element that can be extracted from the housing for cleaning or replacement. The filter upstream surface is positioned such that it can be easily removed from the housing without requiring disassembly of the entire appliance, facilitating regular maintenance 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 solution effectively protects the motor from dust while maintaining efficiency by minimizing pressure drop across the filter and extending the maintenance interval, ensuring reliable 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 cyclonic separator which incorporates a filter upstream of the motor
Implementation Method 3
it is still prudent to provide a fine dust filter upstream of the motor to ensure that no dust can enter the motor and cause it to become damaged or unbalanced
Data Source
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AI summary
A handheld cleaning appliance comprises a dirty air inlet (18), a clean air outlet (24) and a separator (100) for separating dirt and dust from an airflow in an airflow path leading from the air inlet (18) to the air outlet (24). The appliance further comprises a body (12) housing a fan and motor for drawing air into the appliance (10) via the dirty air inlet (18). The separator (100) includes at least one cyclone (102, 130). The separator (100) and the body (12) are releasably connected together about a chamber in the airflow path which is formed partly by the body (12) and partly by the separator (100), the chamber housing a filter (56) which is located upstream of the fan and motor and downstream of the or each cyclone (102, 130).