Integrated Damper Blade Stops for Low-Resistance Airflow Sealing
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Solution Overview
Problem
Conventional airflow dampers with blade stops projecting into the airflow region impede airflow, creating eddies and increasing pressure drop, while also compromising structural integrity, leading to inefficiencies in temperature control and potential hazardous gas leaks.
Innovation Solution
The integration of blade stops into the end surfaces of the damper frame eliminates obstacles within the airflow path, enhancing the effective cross-sectional area and structural rigidity, allowing for a more laminar airflow and potentially reducing fan energy requirements by using a lighter gauge frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blade stops are formed as separate pieces affixed to the interior of the frame, then the blade stops can be securely attached to provide a closed position, but the blade stops impede airflow by reducing the effective area and creating eddies that increase resistance
Solution Approach 1:
The blade stop is merged with the frame structure by forming it as an integral part of the end panel through bending or folding the panel itself, eliminating the need for separate attachment pieces. This integration removes the blade stop from the airflow path while maintaining its function of stopping the blade at the closed position, thereby reducing airflow resistance and energy loss.
2Strength
If the frame is constructed from thick gauge metal with 90 degree flanges to prevent deformation, then structural integrity is maintained, but the frame weight and material usage increase
Solution Approach 1:
The frame is segmented into functional components: the main frame structure uses sufficient thickness for structural integrity, while the end panels are formed into blade stops that provide additional rigidity without requiring the entire frame to be thick-gauge metal. This segmentation allows optimization of material usage, reducing overall weight while maintaining strength where needed.
Solution Approach 2:
The end panels are bent or folded to create three-dimensional blade stop structures that extend into the airflow region. This dimensional transformation adds structural rigidity to the frame in a targeted manner, providing the necessary strength to prevent deformation without requiring increased thickness throughout the entire frame, thus reducing overall weight.
3Manufacturing precision
If blade stops extend into the interior airflow area, then the damper blades can be securely stopped at the closed position, but the effective cross-sectional area for airflow is reduced
Solution Approach 1:
Instead of having blade stops extend into the airflow region from the frame interior, the blade stops are formed by bending the end panels outward to create stopping surfaces that contact the blade edges. This inverted configuration provides precise stopping position accuracy while minimizing intrusion into the airflow path, thereby preserving the effective cross-sectional area for air flow.
Data Source
AI summary
A damper comprises a generally rectangular frame extending between opposed open faces and defining an airflow region. One or more damper blades comprises a substantially air-impermeable vane pivotally mounted between the sides of the frame and pivotable between an open position and a closed position. In the closed position an edge of the adjacent blade abuts a blade stop surface formed along each end, such that in the closed position one edge of the blade adjacent to each end of the frame extends into a recess and abuts the blade stop surface, to prevent air from flowing between the blade and the end of the frame. In the preferred embodiments the blade stop surfaces are integrally formed in each end panel.