Turbomachine Connection Shaft Venting Path
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Solution Overview
Problem
In turbomachines, the disconnection of the connection shaft from the motor-generator leads to undesirable loads and thermal energy buildup, damaging components like bearings and seals due to pressure differences.
Innovation Solution
A communication path is established within the connection shaft to vent fluid from the motor-generator when decoupled, reducing internal pressures and loads on the connection shaft, and biasing the shaft towards the motor-generator to minimize frictional loading and thermal energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connection shaft is decoupled from the motor-generator to prevent error communication, then reliability is improved, but harmful factors increase due to pressure loads and thermal energy buildup
Solution Approach 1:
A communication path is introduced as an intermediary element within the connection shaft that allows controlled fluid communication between the motor-generator interior and exterior. This mediator enables pressure equalization while the shaft remains in the decoupled position, preventing harmful pressure loads on bearings and seals without compromising error isolation.
Solution Approach 2:
The harmful pressure differential is extracted from the system by providing a dedicated fluid communication path that bypasses the mechanical coupling interface. This separates the function of mechanical decoupling (for reliability) from pressure management (through the communication path), allowing both objectives to be achieved simultaneously.
2Reliability
If the connection shaft is decoupled to ensure error isolation, then reliability is improved, but thermal energy levels increase causing component degradation
Solution Approach 1:
The communication path serves as a thermal management intermediary by enabling fluid flow that carries away thermal energy from the motor-generator interior. This allows the shaft to remain mechanically decoupled for error isolation while the fluid communication path provides continuous thermal management, preventing overheating of bearings and seals.
Solution Approach 2:
A fluid communication path is utilized to manage thermal energy by allowing fluid flow through the connection shaft. The fluid acts as a heat transfer medium, carrying thermal energy from the motor-generator interior to the exterior, thereby controlling temperature levels while maintaining mechanical decoupling for reliability.
3Strength
If pressures inside the motor-generator are not vented during decoupling, then structural integrity is maintained, but harmful factors increase due to undesirable loads
Solution Approach 1:
The communication path within the connection shaft acts as a mediator that equalizes pressure between the motor-generator interior and exterior. This intermediary fluid path prevents large pressure differentials that would create undesirable loads on the shaft and components, while the shaft itself maintains its structural integrity through proper design.
Solution Approach 2:
The communication path creates pressure equipotential conditions between the motor-generator interior and exterior by allowing fluid communication. This eliminates pressure gradients that would otherwise create harmful axial and radial loads on the connection shaft and supporting components, enabling the shaft to remain structurally sound without承受ing excessive loads.
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
This solution effectively reduces axial loading on the connection shaft, maintains reduced pressures during all flight stages, and minimizes damage to components by venting fluid from the motor-generator, ensuring the connection shaft's integrity and operational reliability.
Implementation Method 1
pressures inside the motor-generator can exert undesirable loads on the connection shaft when the connection shaft is disconnected from the motor-generator
Data Source
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AI summary
A method of reducing loads on a connection shaft (22,22a) includes disengaging a connection shaft from a motor-generator (26) such that the connection shaft is not rotatably coupled to the motor-generator. The method communicates a fluid away from the motor-generator through a communication path (52,52a) established within the connection shaft. An example turbomachine connection shaft is configured to selectively rotatably couple a turbomachine rotor (14) and a motor-generator. The connection shaft establishes a communication path that selectively vents the motor-generator (26).