Angled-Shaft Circular Damper for Lower HVAC Actuation Torque
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Solution Overview
Problem
Butterfly-designed dampers for circular HVAC ducts face significant drag forces and increased torque requirements due to their design, making them energy-intensive to open and close.
Innovation Solution
A zone balancing damper with a circular blade and shaft, where the shaft is angled at 45 or 60 degrees, reducing torque transmission by 29-50% through increased angular distance of torque application, and incorporating an energy recovery system for wireless control and power without wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a butterfly damper design is used for circular HVAC ducts, then the damper can be installed in circular ducts, but significant drag force and increased torque requirements result in high energy consumption
Solution Approach 1:
The patent inverts the conventional butterfly damper design by positioning the shaft at the periphery of the circular blade rather than at the center. This inversion changes the rotation axis from central to eccentric, allowing the damper to open and close with significantly reduced drag force and torque requirements while maintaining compatibility with circular ducts
Solution Approach 2:
The patent introduces a new spatial dimension by angling the shaft relative to the plane of the circular blade. The shaft is positioned at angles between 15-75 degrees (optimally 45-60 degrees) to the blade plane, creating a three-dimensional configuration that reduces the effective drag area during rotation and minimizes torque requirements
2Device complexity
If the shaft is positioned at the center of the circular blade, then the damper structure is simple, but drag force and torque requirements are maximized
Solution Approach 1:
The patent applies asymmetry by positioning the shaft at the periphery of the circular blade rather than at the geometric center. This asymmetric positioning creates an eccentric rotation that reduces the effective drag force during opening and closing operations. The shaft is located at a distance from the center equal to approximately 0.5-0.7 times the blade radius, optimizing the balance between structural simplicity and torque reduction
3Use of energy by moving object
If the shaft is angled at 45 or 60 degrees to the duct axis, then torque transmission is reduced by 29-50%, but the installation and alignment become more complex
Solution Approach 1:
The patent optimizes the shaft angle parameter to specific ranges (15-75 degrees from the duct axis, with optimal angles of 45-60 degrees) to achieve 29-50% torque reduction. This parameter optimization balances the competing requirements of energy efficiency and manufacturing ease, as these specific angles provide significant torque reduction while remaining practical for installation
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
The angled design reduces the energy needed to operate the damper, and the energy recovery system enables wireless operation, lowering operational costs and enhancing efficiency.
Implementation Method 1
the shaft is angled at 45 or 60 degrees, reducing torque transmission by 29-50% through increased angular distance of torque application
Data Source
AI summary
A damper comprising a tubular duct, a circular blade disposed within the tubular duct and a shaft disposed within the tubular duct, wherein the shaft extends through a hole in the circular blade.