Turbine Assembly Stator Blade Carrier Segmentation
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Solution Overview
Problem
Existing steam turbine designs suffer from inadequate stiffness and strength due to excessive length of coupling bolts and subsequent weakening of the stator blade carrier, which complicates assembly and manufacturing.
Innovation Solution
The design eliminates direct coupling between the stator blade carrier and the outer casing, instead using a nozzle valve casing interposed between them, allowing for shorter bolts or integration of components through casting to enhance stiffness and strength, and simplify assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the stator blade carrier is directly coupled to the outer turbine casing using coupling bolts, then the assembly is structurally connected, but the coupling bolts become excessively long causing structural weakening and insufficient stiffness
Solution Approach 1:
The turbine assembly is segmented into distinct modules: the outer turbine casing, the nozzle valve casing, and the stator blade carrier. Each module is independently manufactured and assembled, eliminating the need for excessively long coupling bolts by creating intermediate connection points through the nozzle valve casing that is fixed to the outer turbine casing
Solution Approach 2:
The nozzle valve casing serves as an intermediary component between the outer turbine casing and the stator blade carrier. It provides a intermediate mounting surface that reduces the required length of coupling bolts while maintaining structural integrity and stiffness of the overall assembly
2Ease of manufacture
If coupling bolts are used to connect the stator blade carrier and nozzle valve casing, then the components are joined, but the excessive bolt length weakens the stator blade carrier structure
Solution Approach 1:
The assembly is divided into separable modules that can be manufactured independently with standard-length fasteners, improving both manufacturability and structural strength by avoiding the need for oversized coupling holes that would weaken the stator blade carrier
Solution Approach 2:
The design accepts the use of multiple shorter coupling bolts as a more economical and structurally sound solution compared to using fewer, excessively long bolts that would require large coupling holes and weaken the carrier structure
3Stability of the object's composition
If the casing assembly uses traditional coupling methods, then the components are connected, but the stiffness level is insufficient
Solution Approach 1:
The casing assembly is segmented into rigid modules (outer turbine casing, nozzle valve casing, stator blade carrier) that are independently manufactured with high precision, then assembled using standardized coupling interfaces. This modular approach increases overall stiffness while managing complexity through standardization
Data Source
Figure 1~2
AI summary
A turbine (1) comprises: - an outer casing (12), - a plurality of nozzle blades (16), - a plurality of stator blades (18), - a nozzle valve casing (14) supporting the plurality of nozzle blades (16), the nozzle valve casing (14) being fixed to the casing (12), - a stator blade carrier (22) supporting the plurality of stator blades (18), the stator blade carrier (22) being supported by the nozzle valve casing (14). The casing (12) comprises at least one seat (23, 24) to which the nozzle valve casing (14) is coupled. The nozzle valve casing (14) is interposed between the casing (12) and the stator blade carrier (22) in such a way that the casing (12) and the stator blade carrier (22) are separated from each other.