Filter Box Assembly with Compressive Gas Filter Layer
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Solution Overview
Problem
Respiratory protective devices face discomfort due to high breathing resistance, leading to non-compliance and inadequate protection, with existing filters being bulky and difficult to manufacture, especially when using double-sided configurations with shallow gas and vapour filter beds.
Innovation Solution
A filter box assembly with a common air channel between two filter units, where a particulate filter layer applies a compressive force to a gas filter layer using perforated support plates, allowing for compact design and reliable manufacturing of double-sided filter units with reduced airflow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If larger or multiple filters are used to minimize breathing resistance, then breathing resistance is reduced, but the bulk and weight of the device increases
Solution Approach 1:
The patent combines two filter units into a single integrated assembly where they share a common air channel. This merging allows the filters to be positioned closer together and share structural components, reducing the overall bulk and weight while maintaining the low breathing resistance achieved through multiple filters
Solution Approach 2:
The patent transitions from a single-sided filter configuration to a double-sided filter assembly where filters are positioned on opposite sides of a common air channel. This dimensional change allows more efficient space utilization and reduces the overall device volume and weight while maintaining effective filtration capacity
2Volume of moving object
If double-sided filters with shallow gas and vapour filter beds are used, then device compactness is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent segments the filter assembly into distinct modules: separate filter units with defined particulate and gas filter layers, a common air channel structure, and individual support plates. This segmentation allows each component to be manufactured and assembled independently, simplifying the manufacturing process while enabling compact double-sided configuration
Solution Approach 2:
The patent applies different structural solutions to different parts of the assembly: perforated support plates are used specifically at the gas filter bed locations to provide localized support and maintain shallow depth, while allowing manufacturing flexibility. This localized approach enables compact design without compromising manufacturing ease
3Reliability
If conventional spring mechanisms are used to lock granules in position, then filter reliability is improved, but device bulk increases
Solution Approach 1:
The patent replaces the conventional spring mechanism with a static structural support system consisting of rigid support plates and integrated casing features. This substitution eliminates the need for mechanical springs while maintaining granule stability, reducing device bulk and weight while preserving filter reliability
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
The solution enables the production of compact, low-airflow-resistance filter units that enhance protective performance while simplifying the manufacturing process, addressing the discomfort and bulk issues of existing devices.
Implementation Method 1
the particulate filter layer is configured to bias towards the gas filter layer... the particulate filter layer applies a compressive force to the gas filter layer
Data Source
AI summary
A filter unit for use in a filter box assembly, the filter unit comprising a particulate filter layer and a gas filter layer, the particulate filter layer being configured to bias towards the gas filter layer, exerting pressure thereon. There is also described filter box assemblies (including a duel filter assembly) comprising the filter unit, and a respiratory protective device comprising the filter unit. Also described is a method of manufacturing a filter unit with a gas filter layer and a particulate filter layer, wherein a force is applied to the particulate filter layer causing it to fix the gas filter layer in place. Also described is a method of manufacturing a dual filter assembly wherein a casing is twice reversibly attached to and detached from a support surface, filter units being added to the casing when the casing is attached to the surface.