Vacuum Cleaner Elongate Filter Nesting to Reduce Handheld Size
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Solution Overview
Problem
Handheld vacuum cleaners with two-stage cyclonic separation systems require additional filters to protect motors from fine dust, leading to increased size and weight due to the need for a planar filter configuration.
Innovation Solution
A cyclonic separating apparatus with an elongate filter housed in a duct, featuring radial inlets that allow air to flow into the filter in a radial direction, eliminating the need for a chamber and enabling a more compact design by integrating the filter within the duct surrounded by the cyclonic separating apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a planar filter member is used in a recess adjacent the cyclonic separating unit, then the filter can protect the motor from fine dust, but the overall size of the vacuum cleaner is increased significantly
Solution Approach 1:
The filter element is nested within the cyclonic separating apparatus by positioning it inside the dust collection chamber. The filter is arranged to extend between the cyclonic separating unit and the motor, utilizing the existing internal space of the cyclone separator housing rather than adding external components. This nesting approach allows the filter to protect the motor from fine dust while maintaining a compact overall vacuum cleaner size.
Solution Approach 2:
The filter element is oriented with its filtering surface substantially perpendicular to the airflow direction, changing the traditional planar configuration. The filter extends axially between the cyclonic separating unit and motor, utilizing the longitudinal space within the dust collection chamber. This dimensional reorientation allows effective filtration without requiring additional lateral space.
2Reliability
If a large filter is used to effectively filter fine dust, then motor protection is improved, but the device complexity and size are increased
Solution Approach 1:
The filter element serves multiple functions simultaneously: it filters fine dust from the airflow, structurally connects the cyclonic separating unit to the motor assembly, and defines part of the dust collection chamber boundary. This multi-functionality reduces overall device complexity by eliminating the need for separate structural components while maintaining effective filtration.
Solution Approach 2:
The filter element is merged with the cyclonic separating apparatus by positioning it within the dust collection chamber and integrating it with the airflow path. The filter becomes an integral part of the cyclone separator assembly rather than a separate component, simplifying the overall device structure while maintaining effective fine dust filtration.
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 reduces the overall size and weight of handheld vacuum cleaners while maintaining effective air filtration, improving accessibility and sealing to prevent ambient air ingress.
Implementation Method 1
a cyclonic separating apparatus to separate the dirt and dust from the incoming flow of dirt laden air
Implementation Method 2
the first cyclonic separating stage works to separate relatively large debris from the airflow, whilst the second cyclonic separating stage filters relatively fine dirt and dust from the airflow
Implementation Method 3
an elongate filter arranged fluidly downstream from the first cyclonic cleaning stage
Data Source
AI summary
A vacuum cleaner comprising a cyclonic separating apparatus including a dirty air inlet, a main body connected to the cyclonic separating apparatus and a motor and fan unit for generating an airflow through the cyclonic separating apparatus from the dirty air inlet to a clean air outlet, wherein the cyclonic separating apparatus includes at least a first cyclonic cleaning stage and an elongate filter arranged fluidly downstream from the first cyclonic cleaning stage, the elongate filter being housed in a duct at least partially surrounded by the first cleaning stage, and wherein the filter comprises an inlet portion and a filter portion defining a generally tubular filter chamber, the inlet portion including one or more radially facing inlets to permit air to flow into the inlet portion in a radial direction from where the air flows from the inlet portion to the filter chamber in an axial direction.