Steam Turbine Stator Vane Sealing via Intermediary Member
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In steam turbines, low sealing performance between the outer vane ring and casing leads to increased steam and steam drain leakage, reducing the recovery efficiency of steam drain.
Innovation Solution
A stator vane segment with an outer vane ring and sealing member, where the outer vane ring has protrusions that form a drain recovery space with the casing, and a sealing member is used to enhance sealing performance, guiding steam drain into the recovery space while suppressing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing performance between the outer vane ring and casing is low, then the structure is simpler, but the amount of steam and steam drain leaking from the gap increases, reducing recovery efficiency
Solution Approach 1:
A sealing member is introduced as an intermediary component between the outer vane ring and the casing. This sealing member fills the gap between these two components, preventing steam and steam drain leakage while maintaining the existing simple structure of the outer vane ring and casing themselves.
2Productivity
If a large amount of steam flows into the space to recover steam drain, then more steam drain can be recovered, but the steam leakage from the gap increases, reducing overall efficiency
Solution Approach 1:
The sealing member acts as a mediator that allows controlled flow of steam drain into the recovery space while blocking the escape of steam from the gap. This enables efficient steam drain recovery without the penalty of excessive steam leakage.
3Ease of manufacture
If the gap between outer vane ring and casing is larger, then assembly is easier, but steam and steam drain leakage increases, reducing recovery efficiency
Solution Approach 1:
The sealing member serves as a compensatory intermediary that can accommodate variations in gap size due to manufacturing tolerances or assembly variations. It ensures consistent sealing performance regardless of the exact gap dimensions, maintaining both ease of assembly and reliable sealing.
Data Source
AI summary
A stator blade segment includes a circumferentially extending outer blade ring, a stator blade extending radially inward from the outer blade ring, and a sealing member. The stator blade has a cavity that is formed in the interior of the blade and that communicates with the surface of the blade. The outer blade ring has a blade ring body and two blade ring protrusions. The two blade ring protrusions protrude radially outward from an anti-gas path surface of the blade ring body and face each other across a gap in an axial direction, and together with a casing, a drain recovery space is formed between the two blade ring protrusions. The blade ring body has a blade surface drain recovery passage that allows communication between the cavity and the drain recovery space. One of the two blade ring protrusions has a sealing surface.