Rotary Valve Layout for Position Sensing and Manual Wrenching
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Solution Overview
Problem
Existing rotary valves, such as butterfly valves, often cannot simultaneously incorporate both rotary position sensors and wrenching features due to spatial compatibility issues, which can lead to operational limitations and maintenance challenges, especially in critical applications like aircraft air conditioning systems.
Innovation Solution
A rotary valve design that integrates a rotary position sensor and a wrenching arm, where the wrenching arm is rotationally coupled to the valve shaft and extends radially, allowing for manual operation while maintaining the functionality of the sensor, using a coupling that absorbs axial and transverse movements to prevent damage to the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a rotary position sensor is incorporated into the valve, then position detection capability is improved, but spatial compatibility and ease of operation are worsened due to conflict with wrenching features
Solution Approach 1:
The patent positions the wrenching arm radially outward from the valve shaft axis, while placing the sensor axially between the shaft and wrenching arm. This spatial arrangement in different dimensions allows both the sensor and wrenching features to coexist without interfering with each other's functionality.
Solution Approach 2:
The coupling component is positioned within the radial space between the valve shaft and the wrenching arm, effectively nesting multiple functional elements (shaft, coupling, sensor, wrenching arm) in a compact radial arrangement. This allows the sensor to be housed within the available space without increasing the overall valve diameter.
2Device complexity
If both sensor and wrenching arm are integrated into the same valve, then device complexity is reduced, but reliability is worsened due to potential damage to the sensor from mechanical movements
Solution Approach 1:
The coupling acts as an intermediary component between the valve shaft and the sensor. It absorbs axial and transverse movements generated during manual wrenching operations, preventing these mechanical disturbances from reaching and damaging the sensor. The coupling transmits only the necessary rotational motion while filtering out harmful linear movements.
3Reliability
If the coupling is positioned axially between the sensor and wrenching arm, then sensor protection is improved, but device complexity increases due to additional coupling components
Solution Approach 1:
The coupling component serves multiple functions simultaneously: it transmits rotational motion from the shaft to the sensor, absorbs axial and transverse movements to protect the sensor, and maintains the axial spacing between the wrenching arm and sensor. This multi-functionality reduces the need for separate protective mechanisms.
Solution Approach 2:
The coupling is designed with specific mechanical properties (flexibility in axial and transverse directions while maintaining rotational rigidity) that allow it to selectively transmit and absorb different types of movements. This parameter optimization enables effective sensor protection without requiring overly complex structural designs.
Data Source
AI summary
A rotary valve includes a valve shaft coupled to a rotary valve element. The valve shaft defines an axis and is rotatable thereabout. The valve further comprises a rotary position sensor and a coupling rotationally coupling the valve shaft and the sensor. A wrenching arm is rotationally coupled to the valve shaft, and extends radially outwardly of the axis for attachment of a wrenching tool thereto. The coupling is axially between the rotary position sensor and the wrenching arm.