Valve Actuator Gear Assembly With Mechanical Torque Cutoff
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Solution Overview
Problem
Valve actuators for air conditioners face instability in harsh environments due to sensor instability and require a separate PCB for motor stop signals, which complicates the system and increases costs.
Innovation Solution
A valve actuator design that includes a gear assembly with a selective power transmission unit, which blocks rotational force based on the rotational angle of the output gear, eliminating the need for electronic sensors and separate PCBs by using a mechanical structure to control motor operation and prevent over-torque damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electronic sensors and PCB are used to control motor stop signals, then valve actuation control is achieved, but system complexity and material costs increase
Solution Approach 1:
The patent replaces electronic sensors and PCB-based motor stop control with a purely mechanical limit switch mechanism. The limit switch is driven by the gear assembly's motion to automatically stop the motor at predetermined positions, eliminating electronic components while maintaining precise valve actuation control.
Solution Approach 2:
The mechanical limit switch system is self-actuating through the gear assembly's own motion. As the gears rotate during valve operation, the limit switch is automatically engaged or disengaged by the mechanical movement itself, requiring no external electronic control signals or sensors.
2Ease of operation
If electronic sensors are used in harsh environments, then valve control is achieved, but sensor instability occurs
Solution Approach 1:
The patent eliminates electronic sensors from harsh environments by substituting them with a mechanical limit switch system. The limit switch uses pure mechanical contact and movement to detect valve position and control motor stopping, providing reliable operation in high-temperature, high-humidity, or corrosive conditions where electronic sensors fail.
3Duration of action of moving object
If motor continues to drive after valve closure, then motor operation is maintained, but over-torque damage occurs
Solution Approach 1:
The mechanical limit switch is positioned to engage before the valve reaches full closure or maximum torque conditions. As the gear assembly approaches the critical position, the limit switch automatically disconnects the motor drive, preventing over-torque damage before it can occur.
Solution Approach 2:
The limit switch provides real-time mechanical feedback on the gear assembly's position and torque conditions. When predetermined torque thresholds or position limits are reached, the limit switch automatically signals the motor to stop, creating a closed-loop control system that prevents over-torque damage.
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 solution enhances durability and driving stability by preventing motor and gear assembly damage from over-torque and eliminates sensor instability, simplifying the system and reducing material costs.
Implementation Method 1
The at least one power transmission gear includes a third gear configured to, based on a rotational angle of the second gear, selectively block the rotational force of the first gear being transmitted to the second gear.
Data Source
AI summary
A valve actuator includes a motor and a gear assembly that receives driving force of the motor and controls a valve. In the gear assembly, a power transmission gear for transmitting rotational force of an input gear to an output gear includes a selective power transmission unit. When the output gear is in physical contact with a stopper, the power transmission gear transmits the rotational force of the input gear to the output gear is blocked. Accordingly, even after the valve is actuated to close a path, the rotational force of the input gear is not transmitted to the output gear even though the motor is continuously driven.