Spring-Loaded Bypass Damper for HVAC Static Pressure Control
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Solution Overview
Problem
In HVAC systems, single-stage forced air equipment often experiences undesirable static pressure rises, leading to noise and inefficiencies, as multi-stage equipment may not fully compensate for these increases, necessitating the use of bypass dampers that reduce energy efficiency unless opened only when necessary.
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 rises 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 a bypass duct to reduce static pressure rises, then the static pressure control is improved, but the energy efficiency deteriorates due to air recirculation
Solution Approach 1:
The patent applies parameter changes by using a torsion spring with adjustable bias force to change the damper's opening pressure threshold. This allows the damper to remain closed at lower pressure differentials (maintaining energy efficiency) while opening at higher pressure differentials (controlling static pressure). The adjustable spring constant and pre-load force enable precise control of the damper activation point, resolving the contradiction between pressure control and energy efficiency.
Solution Approach 2:
The patent implements dynamics by transitioning from a static damper position to a dynamic one. The damper blade can rotate between closed and open positions based on real-time pressure differential conditions. The torsion spring provides continuous adjustable bias force that allows the damper to dynamically respond to changing system pressure conditions, opening only when necessary to relieve excessive static pressure while remaining closed during normal operation to maintain energy efficiency.
2Device complexity
If a traditional static pressure regulating damper is used, then the pressure control is simplified, but the differential pressure control precision deteriorates across wide flow ranges
Solution Approach 1:
The patent overcomes the precision limitation by changing the physical parameters of the spring system. The torsion spring's bias force can be adjusted to match specific operating conditions, and the spring constant can be selected to provide appropriate stiffness for the application. This parameter adjustability enables precise differential pressure control across wide flow ranges, from low-flow residential to high-flow commercial applications, while maintaining a relatively simple mechanical structure.
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 rises, enhancing energy efficiency and reducing noise by allowing precise control of air flow, outperforming traditional static pressure regulating dampers in maintaining a flat differential pressure across 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).