Turbine Blade Seal Assembly With Insert-Key Retainer Support
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Solution Overview
Problem
Conventional gas turbine designs face issues with windage loss due to bolt protrusions causing friction during high-speed rotation, leading to efficiency loss and stress concentration on the turbine rotor disk and retainer plate, which complicates assembly and stability.
Innovation Solution
A turbine blade seal assembly structure featuring a retainer plate fixed to the turbine rotor disk with an insert key supporting the retainer plate, minimizing protrusions and reducing friction, while using a mounting rib and key slots to secure the retainer plate, thereby enhancing structural stability and ease of assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fastening bolt is used to fix the retainer plate to the turbine rotor disk, then the retainer plate can be securely fixed, but the bolt head protrudes from the retainer plate causing friction with gas during high-speed rotation which increases windage loss and reduces efficiency
Solution Approach 1:
The protruding bolt head is extracted and removed from the structure. Instead of using a conventional bolt with a protruding head, the patent uses a bolt that is fully embedded within the retainer plate, eliminating the protruding portion that causes windage loss while maintaining the fixation function.
2Reliability
If a fastening bolt is used to fix the retainer plate, then the retainer plate can be securely fixed, but the weight of the bolt causes stress concentration on the root part of the blade which reduces structural stability
Solution Approach 1:
The stress concentration problem is addressed by extracting the bolt weight from the root part of the blade. The bolt is designed to be embedded within the retainer plate rather than extending into the blade root, removing the source of stress concentration while preserving the fixation function through alternative structural arrangements.
3Reliability
If a conventional bolt fixation method is used, then the retainer plate can be fixed to the rotor disk, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The fixation function is merged with the structural components themselves. The retainer plate and rotor disk are designed with integrated features (such as embedded bolt recesses and corresponding protrusions) that combine the fixation and structural functions, eliminating the need for separate complex assembly operations while maintaining reliable fixation.
Data Source
AI summary
Proposed is a turbine blade seal assembly structure including a turbine blade comprising an airfoil part, a platform part, and a root part, a turbine rotor disk allowing the root part of the turbine blade to be mounted thereto and having a mounting rib extending radially from one axial side of the turbine rotor disk to form a mounting groove, a retainer plate mounted between the platform part and one side part of the turbine rotor disk so as to seal a cooling flow path formed inside the root part and the platform part, and an insert key inserted axially into an upper end of the mounting rib and inserted into a lower end of the retainer plate to support the retainer plate.