Air Filter Frame Guard to Prevent Buckling and Bypass in HVAC Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Air filters in HVAC systems tend to buckle and fail due to dust accumulation, leading to unfiltered air bypassing the filter and reducing the efficiency of heat transfer, resulting in increased energy costs and maintenance needs, particularly in poorly maintained systems where regular filter replacement is neglected.
Innovation Solution
A frame guard with a downwind rim is introduced to support the air filter, preventing buckling and bending by providing structural reinforcement while minimizing airflow obstruction, and designed to fit within existing filter boxes to ensure continued effective filtration without additional costs or system modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air filter is used to filter dust and particulates from air, then air filtration is improved, but air filter buckles and bends when dust accumulates, causing unfiltered air to bypass the filter
Solution Approach 1:
The patent applies preliminary action by installing a support structure (such as a rigid back panel or reinforcement ribs) behind the air filter before dust accumulation causes buckling. This preventive support maintains the filter's structural integrity throughout its service life, ensuring continuous effective filtration without the need to wait for failure symptoms to appear.
Solution Approach 2:
The patent implements beforehand cushioning by providing a rigid support structure that absorbs and distributes the mechanical stress and vacuum forces acting on the air filter. This support acts as a cushion against the harmful buckling forces, preventing structural failure even when the filter becomes heavily loaded with dust and particulates.
2Reliability
If air filter is placed in filter box without additional support, then device complexity is minimized, but air filter becomes susceptible to bending and failure under vacuum pressure
Solution Approach 1:
The patent employs flexible shells and thin films by using a thin rigid back panel or reinforcement ribs that provide structural support while maintaining minimal thickness. This approach adds reliability to prevent buckling without significantly increasing device complexity or occupying excessive space within the filter box.
Solution Approach 2:
The patent applies parameter changes by modifying the structural parameters of the filter assembly through the addition of support elements with specific rigidity, thickness, and positioning parameters. These parameter adjustments enhance the filter's resistance to buckling while keeping the overall structure simple and compatible with standard filter box dimensions.
3Productivity
If air filter is made larger to increase filtration capacity, then air filtration performance is improved, but air filter becomes more susceptible to bending and failure
Solution Approach 1:
The patent applies segmentation by dividing large air filters into smaller modular sections or panels. This segmentation reduces the span between support points, preventing buckling in large filters while maintaining overall filtration capacity. The segmented structure can be supported by multiple reinforcement ribs or divided into replaceable modules.
Solution Approach 2:
The patent implements another dimension by adding structural support in the depth dimension (perpendicular to the filter face). Rather than trying to increase the rigidity of the thin filter media itself, the solution adds a third dimension of support through rear panels or ribs that extend into the filter box, providing structural stability to large filters without compromising their filtration capacity.
Data Source
AI summary
An air filter guard includes a downwind rim that supports an air filter in a filter box of an HVAC air handler. The downwind rim prevents the air filter from deforming, bending, or buckling to create gaps that allow air to bypass the air filter. In particular, the air filter guard prevents an air filter from deforming, bending, or buckling even when the air filter is overdue for replacement and clogged with dust. The air filter guard acts as a sleeve in which an air filter is inserted. The air filter guard and air filter are then placed in the filter box of an air handler. The air filter guard has inner dimensions that are large enough to receive the air filter while the outer dimensions of the air filter guard are small enough to fit within the filter box.