Active Dust Filter Cartridge for Portable Power Tool Suction
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Solution Overview
Problem
Existing filter arrangements for dust-laden air from hand-guided power tools, such as sanders and grinders, have limited air filtering capabilities and efficiency while maintaining small dimensions and flexibility, and are often cumbersome for user mobility.
Innovation Solution
An active filter arrangement incorporating an airflow generating device with a fan, driven by an electric motor, which is pneumatically connected to the filter cartridge to enhance airflow and create a cyclone effect, improving filtration efficiency and extending filter element lifespan while allowing for flexible and portable use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passive filter cartridge is used, then the device maintains small dimensions and flexibility, but the air filtering capabilities and efficiency are insufficient
Solution Approach 1:
The patent combines a passive filter cartridge with an active airflow generating device (vacuum cleaner) into a single integrated unit. The filter cartridge is positioned within the vacuum cleaner housing, and the airflow generator creates negative pressure that draws dust-laden air through the filter element. This merging provides active suction to enhance filtration efficiency while maintaining the compactness of the filter cartridge design.
Solution Approach 2:
The patent utilizes pneumatic principles by employing an airflow generating device that creates negative pressure (suction) to move dust-laden air through the filter element. The airflow generator establishes pressure differentials across the filter cartridge, enabling active air movement and enhancing the filtration process without requiring additional mechanical moving parts in the filter cartridge itself.
2Reliability
If a vacuum cleaner is used, then good air filtering capabilities are achieved, but the device has large dimensions and restricts user freedom of movement
Solution Approach 1:
The patent segments the vacuum cleaner system into a main body housing containing the airflow generator and a separate, attachable filter cartridge assembly. The filter cartridge is designed as a compact, lightweight component that can be easily attached to or removed from the vacuum cleaner housing, reducing the overall weight that the user must carry while maintaining filtration functionality.
Solution Approach 2:
The filter cartridge is nested within the vacuum cleaner housing structure. The filter element is positioned inside the filter cartridge casing, which in turn is integrated into the vacuum cleaner body. This nesting arrangement minimizes the overall device dimensions and allows the filter cartridge to be a compact, lightweight component that does not significantly increase the total weight or bulk of the vacuum cleaner.
3Duration of action of stationary object
If the filter element surface area is increased, then the service life is extended, but the filter cartridge dimensions increase
Solution Approach 1:
The filter element is configured with a three-dimensional pleated or folded structure that increases its effective filtering surface area without proportionally increasing the external dimensions of the filter cartridge. By folding the filter media into multiple layers or pleats, the patent achieves a large total filter area within a compact cylindrical or conical housing, extending service life while maintaining small volume.
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 active filter arrangement significantly enhances air filtering capabilities and efficiency while maintaining compactness and flexibility, allowing users to move freely during tool operation without the weight and bulk of traditional vacuum cleaners.
Implementation Method 1
which is pneumatically connected to the filter cartridge to enhance airflow and create a cyclone effect
Data Source
AI summary
A filter arrangement for filtering dust-laden air generated by a hand-guided power tool having a motor features a filter cartridge having a hollow casing with a longitudinal extension along a longitudinal axis, a hollow filter element located inside the hollow casing, having a longitudinal extension along the longitudinal axis, an air inlet port in the hollow casing, pneumatically connected to the power tool to allow the dust-laden air generated by the power tool to flow into the hollow casing, and an air outlet port in the hollow casing, to allow filtered air to leave the filter cartridge. An external chamber of the filter cartridge is formed between the hollow casing and the hollow filter element. An internal chamber is formed inside the hollow filter element. The internal chamber is closed by a conical head portion at a first end of the internal chamber facing towards the air inlet port. The external chamber is in pneumatic connection with the air inlet port and the internal chamber at a second end opposite to the first end is in pneumatic connection with the air outlet port. The filter arrangement includes an active airflow generating device being in pneumatic connection with the air outlet port and the internal chamber of the filter cartridge in order to generate or support the airflow through the filter cartridge.