Vacuum Cleaner Filter Clamp Sealing for Leak-Free Attachment
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Solution Overview
Problem
Vacuum cleaners, especially wet/dry models, face challenges in sealing filters effectively due to variability in compressive force application, leading to leakage or filter damage, as operators struggle to determine the appropriate force required for sealing without damaging the filter or stripping attachment threads.
Innovation Solution
A filter mounting system that concentrates compressive sealing forces on a specific seal portion, using a rotatable filter clamp and cam mechanism to compress a lateral seal portion within an undercut portion of the mounting assembly, ensuring consistent sealing engagement without applying excessive force to the filter body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compressive force is applied to the filter body for sealing, then sealing effectiveness is improved, but the filter element may be crushed or attachment threads may be stripped
Solution Approach 1:
The filter is divided into distinct functional zones: a sealing portion with enhanced sealable surface area dedicated to sealing, and a filter element portion for filtration. This segmentation allows sealing forces to be concentrated on the sealing portion without compromising the filter element structure.
Solution Approach 2:
The sealing portion is given different properties than the filter element - specifically, an enhanced sealable surface area that is more compliant or sealable. This local quality differentiation enables the sealing area to accommodate compressive forces while the filter element maintains its structural integrity.
2Reliability
If compressive force is increased to prevent dust leakage, then sealing is improved, but fine dust may still leak through due to inconsistent force application
Solution Approach 1:
The filter's sealing portion is designed to self-adjust during installation. As the filter is inserted into the mounting assembly, the enhanced sealable surface area automatically conforms to the mounting surfaces, creating a consistent seal without requiring the operator to precisely control the amount of compressive force applied.
3Reliability
If the filter structure is modified to improve sealing, then sealing performance is enhanced, but the filter becomes more complex and difficult to manufacture
Solution Approach 1:
The filter is segmented into a sealing portion and filter element portion, where the sealing portion incorporates the enhanced sealable surface area. This segmentation allows the sealing functionality to be added as a distinct feature that can be manufactured separately or integrated with minimal complexity increase.
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 solution provides a reliable and consistent sealing mechanism, reducing leakage and filter damage by focusing compressive stress on a defined seal area, allowing for easy installation and removal while maintaining effective filtration performance.
Implementation Method 1
The filter clamp translates toward the seal portion as the filter clamp is rotated along a sloped surface of the cam to engage and clamp the seal portion between the surfaces.
Data Source
AI summary
The disclosure provides a system for mounting and sealing a filter in a vacuum cleaner, such as a wet and dry vacuum cleaner, that concentrates compressive sealing forces on a specific, relatively thin seal portion rather than the filter body as a whole. The concentrated compressive stress provides a well-defined region to consistently provide a sealing engagement. A portion of the seal is positioned into an undercut portion of a mounting assembly and is compressed or “pinched” between opposing surfaces to cause the sealing. Further, one or more of the surfaces are movable to compress the seal portion therebetween by actuation of a rotatable filter clamp engageable with a cam. The filter clamp translates toward the seal portion as the filter clamp is rotated along a sloped surface of the cam to engage and clamp the seal portion between the surfaces.