Vacuum Cleaner Bag with Angled Inner Bag for Sustained Suction Power
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Solution Overview
Problem
Existing vacuum cleaner bags with an inner bag for multi-stage filtering often become clogged with coarse dirt particles, reducing suction power and shortening the service life, especially when full.
Innovation Solution
The inflow opening is angled relative to the bag opening, allowing part of the airflow to enter the inner bag for pre-filtering, and as the inner bag fills, the airflow path is diverted to the vacuum cleaner bag interior, with a protective material on the opposite side to prevent damage and a larger bag opening to distribute airflow, ensuring efficient filtration and extended service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inner bag is added for multi-stage filtering, then filtration performance is improved, but the inner bag becomes clogged with coarse dirt particles and suction power decreases
Solution Approach 1:
The system dynamically adapts the airflow path based on the filling state of the inner bag. When the inner bag is not full, air flows through it for pre-filtration. When the inner bag becomes clogged, the airflow automatically diverts through the inflow opening into the main interior space, maintaining suction power while preserving filtration capability through the outer filter material.
Solution Approach 2:
The angle between the inflow opening and bag opening (60°-120°) is optimized to control airflow distribution. This angular parameter ensures that incoming air is properly directed - part through the inner bag when empty, and allowing bypass flow when the inner bag is full, thus adapting the system behavior through geometric parameter optimization.
2Duration of action of stationary object
If the inner bag is made larger to increase dust capacity, then service life is extended, but the bag opening requires larger size which affects airflow distribution
Solution Approach 1:
The bag opening is designed to be larger than the inflow opening (preferably more than twice as large, in particular more than four times as large). This size parameter difference ensures that incoming air flow can be distributed in the interior of the vacuum cleaner bag and only partially flows into the inner bag at a lower speed, optimizing both capacity and airflow management.
Solution Approach 2:
The angular relationship between the inflow opening and bag opening creates a three-dimensional airflow pattern. By orienting the bag opening at an angle of 60° to 120° to the inflow opening, the system utilizes spatial dimension to control airflow distribution, allowing particles to accumulate on the opposite side while maintaining efficient filtration.
3Reliability
If the inner bag is positioned to maximize pre-filtering, then filtration efficiency is improved, but particles can damage the outer wall filter material
Solution Approach 1:
The piece of material formed as impact protection on the side opposite the inflow opening serves as a preliminary protective measure. This reinforcement prevents damage to the outer wall made of filter material by particles entering, addressing the potential harm before it occurs to the vulnerable filter material.
Solution Approach 2:
The piece of material forming the impact protection is strategically placed only in the endangered area opposite the inflow opening. This localized reinforcement engages with a section in the inner bag, providing enhanced protection where particles are most likely to impact, while leaving other areas with their original filtration properties.
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 design maintains suction power and extends the service life of the vacuum cleaner bag by optimizing airflow and protecting the filter material, even when the inner bag is full, by allowing airflow to bypass the inner bag as it fills and using a protective material to prevent damage.
Implementation Method 1
When the inner bag is filled and thereby an increasing flow resistance is built up, the inflowing air can flow past the inflow opening into the interior of the vacuum cleaner bag
Implementation Method 2
a flat multi-layer filter insert is arranged between a first filter material layer and a second filter material layer in an interior space
Data Source
Figure 1
Figure 2~3
AI summary
The bag (1) has an exterior wall (2) made of filter material i.e. multilayer fleece material, and comprising an inflow aperture (5). An inner bag is provided with a bag aperture (13) and arranged in an inner space of the bag. The inflow opening is formed at an angle of about 60-120 degree to the bag aperture in a blown-up state of the bag, where a part of airflow entering into the inflow aperture flows into the inner bag through the bag aperture. A piece of material (7) i.e. plastic film, arranged as an impact protection part is provided on an opposite side of the inflow aperture.