Rotary Servo Spool Assembly for Compressor Geometry Control
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Solution Overview
Problem
Gas turbine engines face complexity and maintenance challenges due to the need for complicated mechanical mechanisms to translate rotational motion into linear operation for controlling compressor variable geometry, leading to increased component count, wear, and reliability issues.
Innovation Solution
A rotary actuation system with a servo assembly that includes a cylindrical outer spool and inner spool, mechanically coupled to a stepper motor, which rotates to deliver fluid and actuate the compressor variable geometry, eliminating the need for complex translational mechanisms and feedback links, thereby simplifying the system and enhancing maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If complicated mechanical mechanisms are used to translate rotational motion into linear operation for controlling compressor variable geometry, then the control function is achieved, but the device complexity increases and reliability decreases
Solution Approach 1:
The patent extracts and eliminates the complicated mechanical translation mechanisms (levers, linkages, feedback links) from the system. The stepper motor directly drives the spool valve through a simple mechanical coupling, removing the intermediate conversion mechanisms that caused complexity and reliability issues while maintaining the essential control function.
Solution Approach 2:
The patent replaces the mechanical translation and feedback mechanism with a direct rotational control approach. The stepper motor's rotational output directly actuates the spool valve, and the spool's rotational position controls fluid delivery to the actuator, eliminating the need for mechanical rotation-to-linear translation and mechanical feedback links.
2Device complexity
If complicated mechanical mechanisms are used to translate rotational motion into linear operation, then the control function is achieved, but the component count increases leading to more wear and maintenance challenges
Solution Approach 1:
The patent removes multiple intermediate components including levers, linkages, and feedback links from the system. The simplified architecture consists of the stepper motor directly coupled to the spool valve, which controls fluid delivery to the actuator, significantly reducing the component count and eliminating wear-prone elements.
Solution Approach 2:
The patent merges the functions of the motor coupling and feedback link into a single integrated mechanical coupling between the stepper motor and spool valve. This consolidation reduces the number of separate components and assembly points, simplifying both the system architecture and maintenance procedures.
3Ease of operation
If mechanical mechanisms are used to translate rotational motion into linear operation, then the actuator can be controlled, but the system requires feedback links that increase complexity
Solution Approach 1:
The patent replaces the mechanical feedback link with a direct rotational sensing approach. The spool valve's rotational position, controlled by the stepper motor, directly determines fluid delivery to the actuator. The system uses the rotational position of the spool itself as the feedback mechanism, eliminating the need for separate mechanical feedback linkages.
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 rotary actuation system reduces complexity, minimizes wear, and facilitates easier maintenance by directly coupling rotational motion to linear operation, improving the efficiency and reliability of compressor variable geometry control in gas turbine engines.
Implementation Method 1
the cylindrical outer spool includes multiple channels configured to provide fluidic interconnection between the multiple ports and a cylindrical inner spool, the cylindrical inner spool is annularly disposed within the cylindrical outer spool, and the cylindrical inner spool includes grooves configured to provide fluidic interconnection through the multiple channels of the cylindrical outer sleeve
Data Source
AI summary
In general, techniques are described regarding a rotary servo for actuators. A servo assembly includes a cylindrical outer sleeve including ports, a cylindrical outer spool annularly disposed within the cylindrical outer sleeve, a stepper motor mechanically coupled to the cylindrical outer spool, and an actuator mechanically coupled to compressor variable geometry that controls compression provided by a compressor. The cylindrical outer spool includes channels configured to provide fluidic interconnection between the ports and a cylindrical inner spool, where the cylindrical inner spool is annularly disposed within the cylindrical outer spool, and the cylindrical inner spool includes grooves configured to provide fluidic interconnection through the channels of the cylindrical outer sleeve. The stepper motor is configured to rotate the cylindrical outer spool within the cylindrical outer sleeve to deliver a fluid to and thereby actuate the actuator to control the compressor variable geometry.