Spring loaded HVAC damper
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Solution Overview
Problem
In HVAC systems with single-stage forced air equipment, static pressure rises when only a low percentage of zones are calling for air, leading to noise and potential equipment overload, as existing bypass dampers reduce energy efficiency and do not fully compensate for pressure changes.
Innovation Solution
A damper system with a torsion spring and force adjustment mechanism, including a winding mechanism and reverse stop mechanism, is integrated into the bypass duct to control the damper blade's movement, allowing for precise adjustment of the crack pressure and reducing static pressure rise by facilitating the re-circulation of excess air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a bypass damper is placed in the bypass duct to reduce static pressure rise, then the static pressure control is improved, but the energy efficiency deteriorates due to air leakage
Solution Approach 1:
The damper blade is made dynamically adjustable through a force adjustment mechanism that allows the crack pressure setting to be modified. The torsion spring provides a variable bias force that can be adjusted to change the pressure at which the damper begins to open, enabling dynamic adaptation to different operating conditions and zone configurations
Solution Approach 2:
The system changes the parameter of crack pressure through the force adjustment mechanism. By adjusting the bias force on the torsion spring, the crack pressure is modified to match actual system conditions, allowing the bypass damper to operate effectively across varying load conditions while minimizing unnecessary air leakage
2Reliability
If a bypass damper is opened to protect HVAC equipment from overload, then the equipment protection is improved, but the energy efficiency deteriorates due to reduced conditioned air delivery
Solution Approach 1:
The damper system operates with inherent feedback through the torsion spring mechanism. The spring continuously monitors the pressure differential and adjusts the damper position accordingly, opening only when the pressure exceeds the adjusted crack pressure threshold, thus providing automatic equipment protection while minimizing energy loss by keeping the damper closed during normal operation
3Stress or pressure
If traditional static pressure regulating dampers are used, then the pressure control function is provided, but the differential pressure remains highly variable over flow volume range
Solution Approach 1:
The torsion spring acts as a counterweight providing a bias force that opposes the pressure differential across the damper blade. This mechanical counterbalance creates a more stable operating point and reduces the variability of differential pressure over the flow volume range by compensating for pressure changes through the spring's elastic resistance
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 damper system effectively mitigates static pressure rise, reduces noise, and enhances energy efficiency by allowing precise control of air flow, outperforming traditional static pressure regulating dampers by maintaining a relatively flat differential pressure across the damper blade over a wide range of flow volumes.
Implementation Method 1
a torsion spring is in communication with the shaft, and a force adjustment mechanism is in communication with the torsion spring. The shaft, the damper blade, and the torsion spring may be configured such that the shaft may affect movement of the damper blade about a rotation axis and the torsion spring may provide a bias force to the shaft for biasing the damper blade toward a desired position
Data Source
AI summary
An illustrative damper system includes a damper blade that is configured to be positioned within a duct, such as a bypass duct of an HVAC system. A shaft is in communication with the damper blade, a torsion spring is in communication with the shaft, and a force adjustment mechanism is in communication with the torsion spring. The shaft, the damper blade, and the torsion spring may be configured such that the shaft may affect movement of the damper blade about a rotation axis and the torsion spring may provide a bias force to the shaft for biasing the damper blade toward a desired position (e.g. closed position).