Box Fan Air Filter Frame with Vacuum-Actuated Safety Door
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Solution Overview
Problem
There is a need for a commercially viable, safe, economical, and aesthetically acceptable air filtration apparatus for box fans that can provide convenient and effective air filtration while preventing motor strain and potential fire hazards caused by clogged filters.
Innovation Solution
The apparatus includes a rectangular air chamber frame with a hinged door that opens when a partial vacuum is created due to a clogged filter, an anti-tipping feature, a gasket for reduced air leakage, and an alarm mechanism to signal filter replacement, along with a strap system for attaching box fans, ensuring safe operation and efficient air filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is attached to a box fan, then air filtration capability is improved, but motor strain and fire hazard increase when the filter becomes clogged
Solution Approach 1:
The patent implements a vacuum-actuated door mechanism that opens automatically when the filter becomes clogged and creates a partial vacuum. This preliminary action prevents motor strain and fire hazards by allowing the fan to pull air through the open door instead of forcing air through a blocked filter, thereby eliminating the harmful effects before they can occur.
Solution Approach 2:
The patent employs an alarm mechanism that provides feedback when the filter requires replacement. The alarm is triggered by the vacuum conditions created when the filter is clogged, creating a feedback loop that alerts the user to replace the filter before dangerous motor strain or fire hazards develop.
2Reliability
If a filter mounting apparatus is added to a box fan, then air filtration is enabled, but device complexity increases
Solution Approach 1:
The patent designs a multi-functional apparatus that combines filter mounting, vacuum generation, door actuation, and alarm signaling into a single integrated structure. The frame serves both as the structural support and as the mounting surface for the filter, while also housing the vacuum-actuated door mechanism and alarm system, thereby reducing overall device complexity.
Solution Approach 2:
The patent merges multiple functions into unified components: the door mechanism serves both as an air passage control and a vacuum indicator, the frame provides both structural support and filter mounting, and the alarm system is integrated with the vacuum detection mechanism. This merging reduces the number of separate components and simplifies the overall apparatus.
3Object-affected harmful factors
If a vacuum-actuated door mechanism is implemented, then motor strain is prevented, but device complexity increases
Solution Approach 1:
The patent implements a self-actuating door mechanism that uses the vacuum created by a clogged filter to automatically open the door. The vacuum pressure differential itself provides the force to open the door, eliminating the need for external actuators, motors, or complex control systems. The mechanism serves itself by using the problem condition (vacuum) to trigger the solution (door opening).
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 provides safe, efficient, and cost-effective air filtration, preventing motor strain and potential fires, while being portable and capable of handling various filter sizes, effectively cleaning large amounts of contaminated air, and offering a more energy-efficient alternative to HVAC systems.
Implementation Method 1
a hinged door that opens when a partial vacuum is created due to a clogged filter
Data Source
AI summary
An apparatus for safely enabling air filtering by temporarily joining a box fan to a replaceable air filter includes: (a) an air chamber frame with a rear portion that is configured to accommodate the replaceable air filter, (b) a frame stabilizing means that includes a front mounting platform which is configured to temporarily hold a box fan that is oriented to pull air through the filter, (c) a gasket that is configured to attach to the frame's front surface and minimize air flow around the gasket and into the frame, (d) a vent door located in the frame and configured to open to allow air to enter the frame's interior region when the filter is clogged, (e) an alarm mechanism attached to the vent door and configured to provide a signal when the door is been opened, and (f) an alarm device configured to receive the alarm mechanism's signal and provide an alarm that the air filter needs replacement.