Concentric Shaft Actuation Mechanism for Split-Blade Damper Control
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Solution Overview
Problem
Conventional actuators are inadequate for effectively operating split-blade dampers in HVAC systems, as they typically have a single output shaft, unable to separately control both concentric blades, leading to reduced operational efficiency and increased assembly and maintenance costs.
Innovation Solution
A gearbox mechanism with a concentric pair of input dogs and output dogs, allowing axial translation and engagement/disengagement, enables a single actuator to independently modulate the position of each blade by transferring rotational motion from a single input shaft to the output dogs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single actuator with one output shaft is used, then the device complexity is reduced, but the ability to separately control both concentric blades is lost
Solution Approach 1:
The single actuator's output is segmented into two independent output shafts through a differential mechanism, allowing separate control of both concentric blades while maintaining a unified actuator structure. The differential mechanism divides the rotational input into two independent rotational outputs that can operate the inner and outer blades independently.
Solution Approach 2:
A differential mechanism serves as an intermediary between the single actuator input and the two concentric blade outputs. This intermediary component enables the conversion of one rotational input into two independent rotational outputs, resolving the contradiction between simplified actuator structure and dual blade control capability.
2Adaptability or versatility
If multiple actuators are used to control each blade separately, then the blade control capability is improved, but the device complexity and assembly costs increase
Solution Approach 1:
Multiple actuator functions are merged into a single actuator through the differential mechanism. The differential mechanism combines the control of both concentric blades into one unified actuator system, reducing the number of separate actuators needed while maintaining independent blade control capability.
Solution Approach 2:
The single actuator is designed with multi-functionality through the differential mechanism, enabling it to perform both blade control functions simultaneously. The actuator system achieves universal control capability for both inner and outer blades through one actuator, eliminating the need for separate actuators for each blade.
3Adaptability or versatility
If multiple actuators are used, then the blade control capability is improved, but the synchronization complexity and maintenance requirements increase
Solution Approach 1:
The differential mechanism segments the control functions while maintaining a unified input source. By dividing the single actuator's rotational output into two independent blade controls through the differential mechanism, the system achieves independent blade control without the synchronization issues that arise from using multiple separate actuators.
Solution Approach 2:
The differential mechanism acts as an intermediary that automatically coordinates the control of both blades from a single actuator input. This intermediary eliminates the need for manual synchronization and calibration between multiple actuators, as the differential mechanism inherently balances the control signals to both blades simultaneously.
Data Source
AI summary
The present disclosure relates to a power transmission system for actuating a damper. The power transmission system includes an input shaft configured to rotate about a first axis and a first input dog rotatably coupled to the input shaft. The power transmission system also includes a second input dog coupled to the first input dog. The first input dog includes a first arrangement of teeth extending along a second axis and the second input dog includes a second arrangement of teeth extending along the second axis. The first input dog and the second input dog are configured to move axially along the second axis to enable engagement and disengagement of the first and second input dogs with first and second output dogs, respectively. The first and second output dogs are configured to engage with respective damper blades of the damper.