Turbine Rotor Platform Retention via Integrated Rim Fixing
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Solution Overview
Problem
The existing rotating turbomachine assemblies face complexity in mounting and precise placement of platforms due to significant centrifugal and fluid pressure forces, requiring complex and expensive bolted flange fixing systems.
Innovation Solution
A rotating assembly with a bladed disk featuring a rim with integrated fixing elements, recesses for guiding platforms around blades, and a ring system that provides radial support without additional screws or welds, allowing for simpler and more precise attachment of platforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bolted flange fixing systems are used to hold platforms during rotation, then the platforms can withstand centrifugal and fluid pressure forces, but the assembly becomes complex and expensive to manufacture
Solution Approach 1:
The fixing elements are integrated directly into the rim structure, merging the support function with the rim itself. This eliminates separate bolted flange assemblies while maintaining the ability to withstand centrifugal and fluid pressure forces during rotation.
Solution Approach 2:
The rim with integrated fixing elements provides self-supporting capability, where the structure serves its own fastening function without requiring external bolted flange systems. The fixing elements are built-in to hold platforms during rotational operation.
2Reliability
If complex bolted flange systems are used for platform attachment, then platform retention is ensured, but the manufacturing and assembly process becomes expensive
Solution Approach 1:
The fixing elements are combined with the rim in a single integrated structure, eliminating the need for separate bolted flange components. This reduces manufacturing steps, material requirements, and assembly operations, thereby lowering production costs while ensuring platform retention.
Solution Approach 2:
The complex bolted flange system is extracted and replaced with simpler integrated fixing elements built into the rim, reducing manufacturing complexity and cost while maintaining the essential function of platform retention during rotation.
3Manufacturing precision
If platforms are positioned precisely relative to blades and rim, then aerodynamic performance is optimized, but the assembly process becomes complex
Solution Approach 1:
The fixing elements are pre-positioned and integrated into the rim during rim manufacturing, establishing precise reference positions before platform assembly. This preliminary positioning simplifies the subsequent platform attachment process while ensuring accurate aerodynamic alignment with blades.
Solution Approach 2:
The positioning and fastening functions are merged into the integrated fixing elements, which provide both precise location references and secure attachment in a single feature, reducing assembly complexity while maintaining manufacturing precision.
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 solution simplifies the assembly process, reduces the number of parts, and enhances the radial and axial support of platforms, making the turbomachine assembly more economical and efficient while maintaining aerodynamic performance.
Implementation Method 1
said third fastening element being configured to radially hold said ring relative to said rim
Implementation Method 2
said fourth fastening element being configured to radially hold said platform relative to said rim
Implementation Method 3
said fifth fastening element being configured to cooperate with the third fastening element
Implementation Method 4
a recess configured to allow the insertion of said platform around said blade
Implementation Method 5
The recess comprises a bottom, abutting against said blade so as to axially hold said platform relative to the bladed disc
Data Source
Figure 1
Figure 2
Figure 3a~3c
AI summary
Rotating assembly (100) of a turbomachine comprising a rotating bladed disc (10) including a rim (20) on which is positioned a platform (40) held radially in position around the rim (20) by a ring (80), the ring (80) including a third and a fourth fixing element (84, 85); said third fixing element (84) being configured to radially maintain the ring (80) relative to the rim (20) and said fourth fixing element (85) being configured to radially maintain said platform (40) relative to the rim (20), the rim (20) including a fifth fixing element (28) to cooperate with the third fixing element (84).