Vacuum Cleaner Filter Unit with Self-Positioning Scraper Bearing
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Solution Overview
Problem
Existing filter units for vacuum cleaners require precise alignment of scraper bearings, leading to increased production effort and potential for production waste due to incorrect positioning.
Innovation Solution
A filter unit design where the scraper axle is mounted on one side with an annular element acting as a second bearing point on the filter medium, eliminating the need for exact alignment of two bearing points and allowing for simpler assembly and reduced waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two bearing points are used for the scraper axle (one on cover, one on web), then the scraper can be supported on both sides, but the bearing points must be positioned exactly one above the other requiring complex alignment and increasing production effort
Solution Approach 1:
The invention extracts the second bearing point from the web assembly and relocates it to an annular element that is supported on the inner side of the filter medium. This eliminates the need for precise alignment between two fixed bearing points, as the annular element can freely position itself on the filter medium's inner surface while still providing stable support for the scraper axle.
2Reliability
If two bearing points are used for the scraper axle, then the scraper is supported on both sides, but incorrect positioning or adjustment of the scraper leads to production waste
Solution Approach 1:
The annular element serving as the second bearing point is designed to automatically position itself on the inner side of the filter medium without requiring precise pre-alignment. This self-positioning capability eliminates the need for complex adjustment procedures during assembly, thereby reducing production waste caused by incorrect scraper positioning while maintaining reliable support stability.
3Ease of manufacture
If the cover part is glued to the filter medium, then assembly is simplified, but the bearing point for the scraper axle cannot be precisely adjusted
Solution Approach 1:
The invention introduces the annular element as an intermediary component between the scraper axle and the filter medium. This annular element serves as the second bearing point and can freely position itself on the inner side of the filter medium, thereby decoupling the gluing of the cover part from the positioning precision requirement. The cover part can be glued to the filter medium for assembly simplicity, while the annular element intermediary ensures precise bearing point positioning without requiring adjustment.
Data Source
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AI summary
The invention relates to a filter unit (12) for a vacuum cleaner and a vacuum cleaner with such a filter unit (12), the filter unit (12) having a cylindrically shaped filter medium (14) with folds (20) and a rotatably mounted axis (16) Means (18) for cleaning the folds (20), wherein the axle (16) is mounted on only one side in a cover part (26) that closes the filter unit (12) and wherein at a free end of the axle (16) there is an annular and on the inside of the filter medium (14) supporting element (32) acts as a second bearing point of the axle (16).