Vacuum Cleaner Filter Bag Inlet Structure Against Filter Cake Buildup
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Solution Overview
Problem
Vacuum cleaner filter bags experience impaired closing functions due to the formation of a filter cake at the inlet opening, which prevents the closing flap from fully closing, especially in regions with low airflow.
Innovation Solution
The filter bag incorporates a 'free area' around the inlet opening, formed by materials such as self-adhesively coated foil, paper, compacted nonwoven material, or a liquid film, which prevents the formation of a filter cake, ensuring the closing device operates effectively by maintaining a smooth surface and reducing fiber deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inlet opening is closed with a closing flap, then dust retention is improved, but the closing function is impaired due to filter cake formation
Solution Approach 1:
The invention extracts the harmful filter cake formation from the closing region by providing a filter cake-free area. The closing flap is positioned on a holding plate that extends beyond the filter bag material, creating a region where filter cake does not form. This separates the closing function from the filtration function, allowing the closing flap to operate freely without obstruction from accumulated dust and fibers.
Solution Approach 2:
The invention applies different properties to different regions of the filter bag. The region around the inlet opening is designed to be filter-cake-free, while other regions continue to collect dust normally. This local differentiation ensures that the closing mechanism operates in a clean area while the rest of the bag performs its dust collection function.
2Device complexity
If the closing flap is positioned close to the inlet opening, then the closing device is compact, but filter cake projects into the pivot region preventing complete closure
Solution Approach 1:
The holding plate is nested within or integrated with the filter bag structure, extending beyond the filter bag material to provide a stable base for the closing flap. This nested arrangement allows the closing device to be compact while maintaining a filter-cake-free pivot region, as the holding plate creates a dedicated area that is separate from the dust collection zones.
3Reliability
If nonwoven material is used for the filter bag, then dust-retaining capacity is improved, but fiber-like constituents deposit and form filter cake at the inlet opening
Solution Approach 1:
The invention extracts the filter cake formation problem from the closing region by designating a specific area around the inlet opening where filter cake does not form. This is achieved by positioning the closing flap on a holding plate that extends beyond the filter bag material, creating a protected zone free from dust and fiber deposition.
Solution Approach 2:
The filter bag is designed with local quality differentiation: the region around the inlet opening is kept free of filter cake through strategic positioning of the closing mechanism, while other regions of the bag maintain their dust collection and retention functions using the nonwoven material's properties.
Data Source
AI summary
The invention relates to a vacuum cleaner filter bag, including an inlet opening (3), a filter bag material which has an inner layer of nonwoven material (10) at least in the region of the inlet opening, and a holding plate (2) which is arranged on the outside of the filter bag in the region of the inlet opening, can be attached to a vacuum cleaner holding means for securing the vacuum cleaner filter bag and on which a closure device (4) for closing the inlet opening is provided, wherein the nonwoven material, in the region of the inlet opening, has a surface (20) which is provided in such a manner that the formation of a filter cake on said surface is avoided.