Vacuum Cleaner Filter Bag Sealing With Dual Pressure Barriers
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Solution Overview
Problem
Existing vacuum cleaners with filter bags face challenges in maintaining effective sealing, leading to potential leaks and contamination of clean air by dust-laden suction air.
Innovation Solution
The implementation of a second seal between the holding plate and a partition wall, which creates a third pressure region, ensuring that even if one seal fails, the pressure lock prevents raw gas from entering the clean gas side, with seals exposed to ambient pressure for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single seal is used between the holding plate and connection piece, then the structure is simple, but sealing reliability is insufficient and raw gas can leak to the clean gas side
Solution Approach 1:
The sealing structure is divided into two separate seals: a first seal between the holding plate and connection piece, and a second seal between the holding plate and partition wall. This segmentation creates multiple independent sealing barriers, so that if one seal fails, the other still prevents raw gas from reaching the clean gas side, thereby improving sealing reliability without excessive complexity
Solution Approach 2:
The partition wall acts as an intermediary element that creates a second sealing interface. By introducing this intermediate structure, the patent establishes an additional pressure barrier that mediates between the raw gas area and the clean gas area, enhancing overall sealing performance
2Reliability
If seals are exposed to ambient pressure on one side, then sealing efficacy is enhanced by pressure differential, but the structure requires additional partition wall
Solution Approach 1:
The partition wall is strategically positioned to create a local pressure environment where both seals are exposed to ambient pressure on their outer sides. This local modification of pressure conditions enhances sealing efficacy through pressure differential without requiring a complete structural redesign
Solution Approach 2:
The partition wall is integrated with the existing filter bag chamber structure, merging the sealing function with the housing structure. This combination approach enhances sealing performance while minimizing additional structural complexity
3Reliability
If a concentric sealing arrangement is used with connection opening larger than leakage opening, then raw gas containment is improved, but manufacturing precision requirements increase
Solution Approach 1:
The connection opening is deliberately made larger than the maximum possible leakage opening, creating an excessive design margin. This ensures that even with manufacturing tolerances and misalignments, the larger connection opening maintains adequate pressure balance and prevents raw gas from reaching the clean gas side
Solution Approach 2:
The design anticipates potential seal failures or leakage by pre-configuring the pressure balance system with a larger connection opening. This beforehand cushioning ensures that even if one seal fails, the pressure differential cannot force raw gas through to the clean gas side
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 ensures that dirty air does not contaminate the clean air stream, even if one of the seals is damaged, maintaining air purity by utilizing a concentric sealing arrangement and higher pressure on the seals for improved sealing efficacy.
Implementation Method 1
a first seal being arranged between the holding plate and the connection piece... a second seal being arranged between the holding plate and a partition wall... both seals being exposed to the pressure of a third pressure range
Implementation Method 2
The filter bag arranged in the vacuum cleaner is used to filter the suction air flow laden with dust
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The vacuum cleaner contains a filter bag (4) having a holding plate (9) with an inflow aperture (10) with a connector (13) bounding a first pressure regions (P1). There is a first seal (17) between the holding plate and this connector. The holding plate is also sealed by a second seal (18) from a second pressure region (P2) formed by a partition wall (15) fixed to the housing.