Steam Turbine Stator Annular Support Against Partition Deformation
Solution Overview
Problem
In steam turbines, the partition plate experiences deformation due to pressure differences, necessitating a balance between maintaining strength and reducing thickness to avoid significant size increases.
Innovation Solution
The partition plate design incorporates an annular protruding portion that protrudes in the axial direction, supported by the casing, to counteract deformation caused by differential pressure, ensuring rigidity without increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the partition plate is made thick to suppress deformation due to pressure difference, then the strength and rigidity are improved, but the size of the steam turbine increases significantly
Solution Approach 1:
The invention transitions from a flat partition plate to a three-dimensional structure by adding a protruding portion that extends in the axial direction. This dimensional change creates a arch-shaped configuration where the protruding portion provides structural support against pressure differential forces, enabling the plate to maintain strength while reducing overall thickness and turbine size
Solution Approach 2:
The partition plate incorporates a curved arch-shaped structure with a protruding portion instead of a flat surface. This curvature allows the structure to better distribute and resist the pressure differential forces acting on it, providing enhanced rigidity and strength without requiring increased thickness, thus preventing turbine size increase
2Stability of the object's composition
If the partition plate is made thick to suppress deformation, then the rigidity is improved, but the number of stages that can be accommodated is reduced
Solution Approach 1:
By adding the axial dimension through the protruding portion, the invention creates a three-dimensional arch structure that provides rigidity without increasing the radial thickness. This allows for thinner partition plates that can be stacked in more stages within the same turbine casing, thereby increasing productivity
Solution Approach 2:
The partition plate is segmented into distinct functional portions: the plate body for steam flow and the protruding portion for structural support. This segmentation allows the support function to be provided by the protruding portion rather than by increasing the overall thickness, enabling more stages to be accommodated
Data Source
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AI summary
A turbine stator (10) includes a partition plate (3) including an inner ring (6) that extends along a circumferential direction (Dc), an outer ring (7) that is disposed on an outer side of the inner ring (6) in a radial direction (Dr), and extends in the circumferential direction (Dc), a plurality of nozzles (8) that are disposed in the circumferential direction (Dc) between the inner ring (6) and the outer ring (7), and are configured to guide a fluid from an upstream side toward a downstream side in an axial direction (Da), and an annular protruding portion (9), protrudes from the outer ring (7) to the downstream side in the axial direction (Da), and extends along the outer ring (7) in the circumferential direction (Dc), and a casing (4) surrounding the partition plate (3) from the outer side in the radial direction (Dr), and having a contact support surface (453) that is in contact with the annular protruding portion (9) from the downstream side in the axial direction (Da).