Turbomachine Variable-Pitch Propeller Module With Rotary Synchronization
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Solution Overview
Problem
Existing variable-pitch propeller systems for turbomachines face challenges in integration, energy delivery, precise adjustment, and reliability, particularly due to the size and complexity of the pitch change mechanism, which affects modularity and maintenance.
Innovation Solution
A system comprising a rotating casing with an annular row of rotary actuators and a synchronization ring driven by these actuators, guided by guide means, allows synchronized pitch changes with precise timing and robust integration, using a synchronization ring to distribute forces and torques, ensuring redundancy in actuator operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a synchronization ring is used to modify the timing of an annular row of blades, then the pitch of all blades can be changed in a synchronized manner, but the size and complexity of the pitch change mechanism increases
Solution Approach 1:
The synchronization ring acts as an intermediary element between the actuators and the blades. It receives rotational input from the actuators and distributes it uniformly to all blades through its circumferential toothing, ensuring synchronized pitch change while simplifying the overall control architecture.
Solution Approach 2:
The patent replaces complex hydraulic or electrical synchronization systems with a purely mechanical gear-based synchronization ring. The toothing on the ring meshes with corresponding elements on each blade, providing precise mechanical synchronization without requiring complex control systems.
2Adaptability or versatility
If individual actuators are used per blade, then each blade can be controlled independently, but problems of integration, power supply to actuators and complexity for adjustment arise
Solution Approach 1:
The synchronization ring serves multiple functions simultaneously: it transmits rotational motion from actuators, provides mechanical synchronization, and distributes torque to all blades. This multi-functionality reduces the need for separate control systems for each blade.
Solution Approach 2:
The patent merges the functions of multiple individual actuator systems into a single centralized actuation system that drives the synchronization ring. This consolidation reduces the number of separate power supply lines, control channels, and adjustment mechanisms required.
3Measurement precision
If a rotating ring driven by jacks in a plane transverse to the longitudinal axis is used, then the timing of an annular row of blades can be modified, but the integration into the propeller hub space becomes problematic
Solution Approach 1:
The synchronization ring is positioned in a different spatial dimension within the hub assembly, utilizing the axial space rather than transverse space. This repositioning allows the mechanism to fit within the constrained hub volume while maintaining its timing adjustment function.
Solution Approach 2:
The synchronization ring and its associated components are nested within the existing propeller hub structure. The mechanism is integrated into the hub's internal volume, with the ring positioned between the hub and the blades, effectively utilizing otherwise wasted space.
4Ease of operation
If the pitch change mechanism is installed in the propeller hub, then blade pitch can be controlled, but the modularity of the engine and its maintenance are impacted
Solution Approach 1:
The pitch change mechanism is segmented into modular components: the synchronization ring, the actuators, and the blade connection elements. This segmentation allows individual components to be replaced or maintained independently, improving serviceability while maintaining integrated operation.
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
Facilitates compact and reliable pitch control with precise blade timing, enabling efficient integration and reduced maintenance, while ensuring continued operation in case of actuator failure.
Implementation Method 1
the synchronization ring being guided in rotation relative to said rotating casing by guide means
Implementation Method 2
meshed by a first toothing of the synchronization ring with pinions of the blades
Data Source
Figure 1~4
AI summary
The invention relates to a turbomachine module (1), comprising: - a rotating housing (7-8) supporting a propeller provided with a plurality of blades (5), - a system for varying the pitch of the propeller blades (5), the system comprising a control means, and a mechanism for varying the pitch of the propeller blades, characterised in that the system is supported by the rotary housing (7-8), in that the control means comprise an annular row of rotary actuators (16), and in that the mechanism for varying the pitch of the blades comprises a synchronisation ring (11) that is driven to rotate by rotary output shafts (17) of the actuators (16), the synchronisation ring (11) being guided in rotation relative to the rotary housing (7-8) by guide means and meshed by a first toothing (13) with pinions (14) of the blades (5).