Turbine Vane Blocking Device Radial Deployment Mechanism
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Solution Overview
Problem
Existing circumferential blocking devices for hammer clamp vanes in turbine engine discs face issues with high-temperature adaptability and jamming, particularly in aircraft turbojet or turboprop engines, due to reliance on elastic means or screw systems that require access to vane platforms, leading to potential damage during dismantling.
Innovation Solution
A radial deployment system comprising two pieces with a gripping member and ramp design that allows circumferential displacement, eliminating the need for access to vane platforms and reducing jamming risks, featuring a locking mechanism that ensures blockage in the circumferential direction, and can be easily controlled from the introduction window of vane bases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If elastic means are used for deploying the blocking device in the groove, then the device can be easily deployed, but it proves poorly adapted to a high-temperature environment
Solution Approach 1:
The patent replaces elastic means with a mechanical deployment system consisting of a wedge-shaped piece and a ramp. The wedge piece is introduced through an introduction window and uses the ramp to convert circumferential displacement into radial deployment motion, eliminating the need for elastic components that fail in high-temperature environments.
2Reliability
If a screw system is used for deploying the blocking device, then the device can be locked in place, but it is subject to jamming and requires access at the level of the vane platforms
Solution Approach 1:
The patent extracts the deployment mechanism from the vane platform level and relocates it to the introduction window level. The wedge piece and ramp system are positioned in the groove and controlled from above, eliminating the need for access to vane platforms and avoiding the jamming issues associated with screw systems.
3Reliability
If a screw system is used for deploying the blocking device, then the device can be locked in place, but it requires partial or total destruction of the blocking device during dismantling, with the risk of damage to the disc
Solution Approach 1:
The patent employs a dynamic wedge-locking mechanism where the wedge piece can be easily moved along the ramp to deploy or retract the blocking device. This reversible mechanical action allows for simple dismantling without destruction, contrasting with the irreversible damage required when removing screw systems.
4Reliability
If the blocking device is deployed in the radial direction, then it can lock in the circumferential groove, but it requires a complex deployment mechanism
Solution Approach 1:
The blocking device is segmented into two main components: a wedge-shaped piece for deployment and a ramp structure for force transmission. This segmentation allows each component to have a simple, specialized function, reducing overall complexity while achieving reliable radial deployment through circumferential motion.
Data Source
AI summary
The invention relates to a device (30) for blockage of vanes in a circumferential groove (10) of a turbine engine disc, the device being intended to deploy in a radial direction to be locked in the circumferential groove open radially. According to the invention, the blocking device comprises a first and a second piece (32, 34) designed to deploy in the radial direction by relative displacement of these pieces in the circumferential direction (23).