Propellant Gas Filter with Visual Saturation Indicator
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Solution Overview
Problem
Existing devices for evacuating and disposing of pressurized aerosol cans do not adequately filter gases and residual contents, posing safety and environmental hazards, and are often complex, expensive, and not suitable for repeated use or various container sizes.
Innovation Solution
A two-stage filter assembly with an upper chamber containing activated carbon and a lower chamber with a coalescing filter, along with a visual indicator and flashback inhibitor, is used to filter exhaust fumes and prevent flashback, designed for easy installation and use with off-the-shelf containers, and made from durable materials like aircraft-grade aluminum or polyethylene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter assembly is added to evacuate and filter gases from pressurized containers, then environmental safety and gas filtration are improved, but device complexity and cost increase
Solution Approach 1:
The filter assembly is divided into two separate chambers: a lower chamber containing a coalescing filter for removing liquid aerosol particles, and an upper chamber containing an activated carbon filter for adsorbing gaseous contaminants. This segmentation allows each filter type to be optimized for its specific function while maintaining a compact overall structure that can be integrated into existing evacuation systems.
Solution Approach 2:
The dual-chamber filter assembly serves multiple functions simultaneously: it filters both liquid aerosol particles and gaseous contaminants, provides flashback inhibition through its structural design, and offers visual indication of saturation status. This multi-functionality eliminates the need for separate filtration devices, thereby reducing overall system complexity despite the enhanced filtration capability.
2Device complexity
If existing evacuation devices are used without adequate filtration, then device simplicity is maintained, but harmful gas release and environmental damage occur
Solution Approach 1:
The filter assembly acts as an intermediary component between the pressurized container evacuation system and the atmosphere. It intercepts both liquid aerosol particles and gaseous contaminants, preventing their direct release into the environment. The assembly can be integrated into existing evacuation devices without replacing core components, thus maintaining relative simplicity while adding essential filtration functionality.
3Reliability
If a two-stage filter system is implemented, then filtration effectiveness is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The filter assembly is divided into two separate chambers: a lower chamber containing a coalescing filter for removing liquid aerosol particles, and an upper chamber containing an activated carbon filter for adsorbing gaseous contaminants. This segmentation allows each filter type to be optimized for its specific function while maintaining a compact overall structure that can be integrated into existing evacuation systems.
Solution Approach 2:
The filter assembly utilizes porous materials with different pore size distributions optimized for specific filtration functions. The coalescing filter employs porous structures that promote liquid droplet coalescence and separation, while the activated carbon filter uses porous adsorbent material with high surface area for gas-phase contaminant removal. These specialized porous materials provide high filtration effectiveness at reasonable manufacturing costs.
4Reliability
If filters are used without saturation indication, then device simplicity is maintained, but operational reliability and safety monitoring decrease
Solution Approach 1:
The filter assembly incorporates visual indicators that change color or appearance when the filters become saturated. This allows operators to easily monitor the filtration status and determine when filter replacement or maintenance is needed, enhancing safety monitoring without requiring complex electronic sensing or control systems.
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 filter assembly effectively filters gases and residual contents, indicating saturation and preventing flashback, while being portable, inexpensive, and compliant with EPA regulations, ensuring safe and efficient disposal of pressurized containers.
Implementation Method 1
an upper chamber containing activated carbon... effectively filters gases and residual contents
Implementation Method 2
a lower chamber with a coalescing filter... effectively filters gases and residual contents
Data Source
AI summary
A filter assembly with upper and lower filter chambers containing activated carbon and a coalescing filter, respectively. The filter assembly includes a visual indicator for showing when the filter assembly is saturated and requires replacement or maintenance. In a preferred embodiment, the visual indicator is a temperature indicator. In an alternate embodiment, the visual indicator is an air flow indicator. The filter assembly further includes at least one flashback inhibitor to prevent igniting fumes. The filter assembly connected to a storage drum which accepts residue from pressurized containers and removes contaminants from gas fumes which escape from the storage drum.