Filter-housing interface designs for heating, ventilation, and/or air conditioning systems
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Solution Overview
Problem
Existing air filter housings for HVAC systems face challenges in simplifying filter element installation, reducing user error, and optimizing performance by maintaining the end pleat in an open position to minimize pressure drop and increase dust holding capacity.
Innovation Solution
The filter element design includes a support element with a curved wall and angled endplate structure that allows for easy installation from multiple sides, maintains the end pleat at an angle relative to airflow, and features a rotational alignment member to simplify alignment with the housing rail, ensuring correct orientation and reducing pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional filter element design is used, then the filter element can be manufactured with simple structures, but the installation is complex and prone to user error
Solution Approach 1:
The connecting member incorporates a curved wall that curves about a central axis parallel to the insertion direction. This curved geometry facilitates rotational alignment during installation, allowing the filter element to be easily oriented correctly as it is inserted into the housing rail, thereby improving installation ease without significantly increasing structural complexity
Solution Approach 2:
The support element features an asymmetric design with a rotational alignment member that has a specific orientation relative to the curved wall. This asymmetric configuration ensures correct installation orientation by providing visual and physical cues that guide the user to insert the filter element in the proper direction, reducing user error while maintaining relatively simple manufacturing
2Productivity
If the end pleat is not maintained in an open position, then the filter structure is simpler, but pressure drop increases and dust holding capacity decreases
Solution Approach 1:
The curved wall of the connecting member maintains the end pleat in an open position by following the natural curvature of the pleats. This curved support structure prevents the end pleat from collapsing while adding minimal structural complexity, thereby increasing dust holding capacity and maintaining acceptable pressure drop characteristics
Solution Approach 2:
The support element is pre-configured with the curved wall and rotational alignment member in specific positions that automatically maintain the end pleat openness upon installation. This preliminary configuration ensures optimal performance without requiring additional adjustment steps or complex active mechanisms
3Ease of operation
If a rotational alignment member is added, then installation orientation is simplified, but the device complexity increases
Solution Approach 1:
The rotational alignment member is integrated with the curved wall of the connecting member rather than being a separate component. This merging of functions allows the alignment feature to be achieved while minimizing additional structural complexity, as the same curved geometry that supports the pleats also provides the rotational alignment capability
Data Source
AI summary
A filter element for a heating, ventilation, and/or air conditioning (HVAC) system includes a filter media pack and a first support element. The filter media pack includes a pleated filter media. The first support element includes a connecting member that is coupled to the pleated filter media and includes at least a portion of a curved wall that curves above a central axis that extends substantially parallel to an insertion direction of the filter element into a filter housing. The first interface member is located at a distal end of the connecting member and defines a first support ledge that is disposed over the connecting member and that extends substantially parallel to the insertion direction.