Two-Chamber Filter Bag to Prevent Fine Pore Clogging
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Solution Overview
Problem
Existing filter bags for vacuum cleaners experience a significant reduction in air volume flow as they become filled with dust, leading to clogging of fine filtering pores, which diminishes their filter performance.
Innovation Solution
A filter bag design with an interior divided into two chambers, where incoming air is pre-filtered in one chamber and post-filtered in another, utilizing a partition that is fixed on three sides and has a density gradient for optimal air permeability and a bypass opening to prevent clogging and maintain airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter bag uses fine filtering material, then the filter performance is improved, but the air volume flow decreases as the bag fills with dust
Solution Approach 1:
The filter bag interior is divided into a first chamber for coarse filtering and a second chamber for fine filtering using a partition. This segmentation allows dust particles to be pre-filtered in the first chamber, preventing them from clogging the fine filter material in the second chamber, thereby maintaining air volume flow while preserving filter performance.
2Quantity of substance
If the filter bag filling increases, then the dust collection capacity is improved, but the fine filtering pores become clogged
Solution Approach 1:
The first chamber performs preliminary filtering of dust particles from the incoming air flow before the air enters the second chamber. This preliminary action removes larger dust particles that would otherwise accumulate and clog the fine filtering pores, allowing the filter bag to maintain its dust collection capacity without compromising filter performance.
3Area of stationary object
If a partition is added to create chambers, then the filter surface area is increased, but the device complexity increases
Solution Approach 1:
A simple partition element is introduced to divide the filter bag interior into two chambers. This segmentation effectively doubles the usable filter surface area by creating separate zones for coarse and fine filtering, while the partition itself is a relatively simple structural element that does not significantly increase overall device complexity.
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 extends the effective filter performance by preventing quick clogging of fine filters and maintaining high suction power even with increased filling, allowing for efficient dust separation and extended usage.
Implementation Method 1
a partition has a density gradient and is more open on the inflow side than on the outflow side. As a result, coarser and finer dust can be retained and stored on the partition
Implementation Method 2
If the bypass opening is arranged adjacent to the inlet opening, so that the incoming air can only flow through the bypass opening through a deflection, it is achieved that the air flowing through the bypass opening releases a certain amount of dust particles into the antechamber through centrifugal forces
Implementation Method 3
The filter bag comprises an upper layer 2 and a lower layer 3 made of filter material... a first chamber 9 is used for coarse filtering of the incoming air and a second chamber 10 for fine filtering of the air emerging from the first chamber
Implementation Method 4
The partition wall can be designed to be elastic and can be stretched with increasing filling, the air permeability being greater in the stretched state than in the unstretched state
Implementation Method 5
If the bypass opening is arranged adjacent to the inlet opening, so that the incoming air can only flow through the bypass opening through a deflection, it is achieved that the air flowing through the bypass opening releases a certain amount of dust particles into the antechamber through centrifugal forces
Data Source
Figure 1~2C
Figure 3A~4
AI summary
The filter bag (1) has a sac formed from an air permeable filter material (2, 3), and an inlet opening (6) formed at the sac for air to be filtered. An inner cavity of the sac is divided into two chambers (9, 10), where the chamber (9) is used for coarse filtering of the air and the chamber (10) is used for fine filtering of the air that is released from the former chamber. A partition wall exhibits a density gradient, and is elastically formed.