Securing Plate Geometric Coding for Turbine Assembly
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Solution Overview
Problem
Gas turbines with multiple turbine stages face challenges in assembly due to securing plates that differ slightly in function-related dimensions, leading to increased error rates during assembly.
Innovation Solution
A securing plate assortment with different geometric codings, including varying recesses and elevations, allows for haptic and visual distinction between plates, enabling error-free assignment and assembly, and potentially automating the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If securing plates with different function-related dimensions are used for different turbine stages, then the gas turbine can accommodate multiple turbine stages with different axial widths and blade designs, but the assembly error rate increases due to the difficulty of distinguishing between similar securing plates
Solution Approach 1:
The patent applies local quality by adding geometric codings (recesses and elevations) to specific local areas of the securing plates, namely the coding areas on the flanges and connecting webs, while keeping the functional areas unchanged. This allows different securing plates to be distinguished locally without affecting their overall functionality in securing blade assemblies to different turbine stages
Solution Approach 2:
The patent implements asymmetry by creating asymmetric geometric codings on the securing plates through different combinations, numbers, shapes, and positions of recesses and elevations. These asymmetric features make each securing plate type uniquely identifiable, preventing incorrect assembly while maintaining the symmetric functional requirements of the securing plates for different turbine stages
2Adaptability or versatility
If securing plates with only marginal dimensional differences are used, then the design can accommodate different turbine stage requirements, but the distinction between different securing plates becomes difficult with the naked eye
Solution Approach 1:
The patent transitions from two-dimensional planar distinctions to three-dimensional geometric codings by adding recesses and elevations that create tactile and visual differences. These dimensional features protrude from or recess into the surface of the securing plates, making them detectable by touch and eye without requiring precise measurement of the plate dimensions themselves
Solution Approach 2:
The geometric codings act as intermediary features that mediate between the securing plate and the assembler. Instead of requiring the assembler to directly perceive and interpret subtle dimensional differences in the functional areas, the intermediary geometric codings provide clear, unambiguous tactile and visual cues that facilitate correct identification and assembly
3Device complexity
If manual assembly of securing plates is performed without geometric coding, then the assembly process is simpler, but the error rate increases and safety is compromised
Solution Approach 1:
The geometric coding system enables self-service assembly by providing inherent, self-evident distinctions between different securing plate types. The recesses and elevations serve as built-in identification features that guide the assembler without requiring external aids, complex procedures, or specialized training, thereby maintaining simplicity while enhancing safety
Solution Approach 2:
The geometric codings provide immediate feedback to the assembler during the assembly process. When a securing plate is correctly oriented and selected, the geometric features align with corresponding features on the turbine stage or blade assembly, providing tactile and visual confirmation of correct assembly. Mismatched plates are easily identified by the lack of proper geometric alignment
Data Source
AI summary
A securing plate assortment including multiple different securing plates, the securing plates having different geometric codings. A turbine and method is also disclosed.