Foldable Air Filter Frame With Pressure-Based Replacement Alerts
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Solution Overview
Problem
Existing HVAC air filters require regular replacement to maintain efficiency, but there is a need for a frame that securely holds replaceable filter media and includes sensors to determine when replacement is necessary, as well as a system to communicate this need to users.
Innovation Solution
A foldable and disposable air filter frame with a base and cover that securely holds the filter media, incorporates a differential pressure sensor to measure air pressure differentials, and a monitoring system that alerts users when replacement is needed, optionally communicating this through a communication module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a disposable filter media is used without a secure frame, then the filter can be easily replaced and disposed of, but the filter media cannot be securely held in place and air may leak around the filter edges
Solution Approach 1:
The frame is divided into a base and a cover that can be separated. The base remains with the HVAC system while the cover is removed with the disposable filter media. This segmentation allows easy filter replacement while maintaining secure holding during operation.
Solution Approach 2:
The disposable filter media is nested within the frame structure, with the filter media placed inside the frame base and secured by the frame cover. This nesting ensures the filter media is securely held during operation but can be easily removed as a complete unit for replacement.
2Reliability
If regular filter replacement is required to maintain HVAC efficiency, then air filtration performance is maintained, but energy consumption increases and system life is shortened due to frequent maintenance interruptions
Solution Approach 1:
A differential pressure sensor is installed in the frame to monitor filter condition in advance. The sensor detects pressure differentials across the filter media and provides early warning before the filter becomes completely blocked, allowing planned replacement at optimal intervals rather than reactive replacement.
Solution Approach 2:
The differential pressure sensor provides continuous feedback on filter condition to the system operator. This feedback loop enables data-driven decisions about filter replacement timing, optimizing the balance between maintaining filtration performance and minimizing maintenance frequency.
3Reliability
If a frame with secure closure is used to hold filter media, then air leakage is prevented, but the frame structure becomes more complex and difficult to assemble
Solution Approach 1:
The sealing function is merged with the frame cover itself. The cover includes integrated sealing edges that engage with the base to create an air-tight seal, eliminating the need for separate gaskets or complex sealing mechanisms while maintaining reliable air leak prevention.
Solution Approach 2:
The frame cover serves multiple functions simultaneously: it secures the filter media in place, creates the air seal against the base, and provides a removal handle for easy filter replacement. This multi-functionality reduces overall system complexity while achieving reliable sealing.
4Measurement precision
If sensors and communication modules are added to the frame to monitor filter condition, then filter replacement timing is accurately determined, but the device complexity and manufacturing cost increase
Solution Approach 1:
The differential pressure sensing function is extracted as a separate, modular component within the frame. This allows the sensor to be independently selected and replaced based on budget constraints, enabling accurate filter condition monitoring without requiring a complex integrated system.
Solution Approach 2:
The frame with integrated sensor is designed as a disposable unit that is replaced along with the filter media. This eliminates the need for complex sensor calibration and maintenance infrastructure, as the entire sensing system is replaced with a new, pre-calibrated unit when the filter is changed.
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
Ensures efficient air filtration by automatically detecting when the filter needs replacement, reducing energy consumption and extending the life of HVAC systems by preventing overheating or failure, and providing real-time monitoring and notification to users.
Implementation Method 1
a sensor for measuring differential pressure across the filter to determine filter change requirements
Data Source
AI summary
A frame for a foldable and disposable air filter media is disclosed. The frame has a frame base and a frame cover having a size to overlap the air filter media. The frame cover is attached to the frame base by hinges allowing movement of the frame cover between an open position and a closed latched position. The closed frame holds the air filter media between the frame base and frame cover when in the closed position. The frame base includes an air flow monitoring system with an air pressure differential sensor to determine when the filter needs to be replaced. The frame also has capability to hold additional sensors for monitoring environmental conditions. A processor and memory enable collection and storage of sensed data. A communication module on the frame communicates air filter media change requirement to external devices including hand-held devices or a cloud server.