Turbine Blade Tip Repair via Internal Welding Access
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Solution Overview
Problem
The existing methods for repairing turbine blades face challenges in creating a strong and secure connection between the blade tip and the blade body, leading to potential instability and wear due to high stress in the area near the tip, which is labor-intensive and time-consuming.
Innovation Solution
A technique involving the removal of the old cap from the turbine blade, followed by the installation of a replacement cap with strategically aligned openings for direct attachment to internal structural supports within the blade body, allowing for secure welding and subsequent filling of these openings to enhance the connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the edge of the tip is welded to the exterior walls of the blade body, then the tip can be connected to the blade body, but the connection is not as secure as the original connection
Solution Approach 1:
The repair process is segmented into distinct phases: removing the old tip, preparing the blade body with reinforcement structures, and installing the new tip. This segmentation allows each phase to be optimized independently, ensuring secure connection while managing repair complexity.
Solution Approach 2:
Reinforcement structures are installed in the blade body before the new tip is attached. This preliminary action strengthens the connection area in advance, ensuring that the final tip-to-blade connection is as secure as the original factory connection.
2Ease of repair
If traditional tip replacement methods are used, then the blade tip can be replaced, but the process is labor intensive and time consuming
Solution Approach 1:
All preparation work including reinforcement structure installation and positioning fixtures are completed before the actual tip installation. This preliminary action reduces the on-site repair time and makes the replacement process more efficient.
Solution Approach 2:
Positioning fixtures and reinforcement structures act as intermediaries that simplify the connection process. These intermediaries guide the tip into proper alignment and provide stable attachment points, reducing the skill level and time required for the repair.
3Strength
If the tip connection is made to exterior walls only, then the installation is simpler, but the connection strength is insufficient under high stress
Solution Approach 1:
The reinforcement structures are nested within the blade body interior, and the tip connects to both the exterior walls and the internal reinforcement structures. This nested arrangement increases connection strength without significantly increasing external complexity.
Solution Approach 2:
The connection is extended from a two-dimensional surface connection (tip edge to exterior wall) to a three-dimensional volumetric connection by adding internal reinforcement structures. This dimensional change distributes the stress across multiple points and increases overall connection strength.
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 method provides a more secure and durable connection between the replacement cap and the turbine blade, reducing wear and stress, thereby extending the lifespan of the blade while minimizing labor and time required for the repair process.
Implementation Method 1
The replacement cap may be welded to the structural support through the opening
Data Source
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AI summary
A method of repair of a turbine blade (30) involves inspecting a turbine blade (30) having an internal cavity (54) and a cap (42). The cap (42) is removed and replaced with a replacement cap (46). The replacement cap (46) has an opening (58). The opening (58) provides access to the internal cavity (54) of the blade (30) so that the replacement cap (46) may be attached to the turbine blade (30) through the opening (58).