Compound Air Filter Pleat Uniformity
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Solution Overview
Problem
Conventional HVAC system air filters face challenges in maintaining a uniform distribution of pleats, leading to decreased surface area and filtration efficiency due to compression or bending of pleats during installation and use.
Innovation Solution
A compound air filter design featuring a support frame, a first media layer with pleats, a second media layer to maintain pleat uniformity, and one or more support layers to resist pleat deformation, ensuring optimal filtration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number or density of pleats is increased to increase surface area and filtration efficiency, then the filtration efficiency is improved, but the ability to maintain a uniform distribution of pleats deteriorates and pleats become prone to compression and bending
Solution Approach 1:
The patent applies composite materials by combining a filter medium with a support structure. The support structure includes a three-dimensional grid or mesh framework that is integrated with or attached to the filter medium, creating a composite assembly where the support structure prevents pleat compression and bending while the filter medium provides filtration functionality. This composite approach allows high pleat density without sacrificing structural stability.
Solution Approach 2:
The support structure functions as a flexible framework that maintains the three-dimensional configuration of pleats. The grid or mesh structure provides rigid support at critical points while allowing the filter medium to maintain its pleated form during installation and operation, preventing deformation without restricting airflow.
2Productivity
If the number or density of pleats is increased to increase surface area, then the filtration efficiency is improved, but the pleats become more susceptible to deformation during installation and use
Solution Approach 1:
The support structure is constructed from materials that provide mechanical strength to individual pleats. The three-dimensional grid or mesh framework includes struts or wires that are sufficiently rigid to resist bending and compression forces during installation and operation, while remaining flexible enough to accommodate the pleated configuration without causing stress concentrations that would lead to deformation.
Solution Approach 2:
The support structure is divided into multiple discrete elements forming a grid or mesh pattern. Each element provides localized support to specific pleats, distributing mechanical loads across the entire filter assembly rather than relying on a single continuous structure. This segmentation allows the support structure to accommodate pleat movement and deformation without compromising overall structural integrity.
3Productivity
If pleats are compressed together to increase filtration density, then the filtration efficiency may be improved, but the surface area of the filter decreases and efficiency is reduced
Solution Approach 1:
The support structure maintains the three-dimensional spacing between pleats, preventing them from compressing together. The grid or mesh framework provides rigid support at critical points, ensuring that pleats remain separated and maintain their full surface area throughout the filter's operational life, thereby preventing the surface area reduction that would occur if pleats were compressed.
Data Source
AI summary
An apparatus and a method are provided for a heating, ventilation, and air conditioning (HVAC) air filter to remove airborne molecular contaminants and volatile organic compounds (VOCs) from air within building spaces. The air filter comprises a support frame having a shape and size suitable to orient the air filter within a HVAC system. A compound filter medium is retained within the support frame to remove the airborne molecular contaminants and VOCs from air flowing through the HVAC system. A portion of the first media layer is pleated and may comprise a combination of media layers configured to exhibit a relatively high filtration efficiency and a low air pressure drop across the filter medium. A second portion of the filter medium is coupled to the first portion and maintains a uniform distribution of the pleats with the first portion.