Variable Stator Vane Assembly With Casing-Mounted Support
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Solution Overview
Problem
The complex inner ring designs in turbomachines due to the need for stability and sealing between stator vanes and rotor components create instability and require complex assembly, which complicates the design and increases the play between components.
Innovation Solution
A stator vane assembly with a support device comprising first and second support elements that stabilize the stator vanes relative to the casing, allowing for a simplified inner ring design and improved assembly by supporting the vanes radially and axially, enabling a one-piece casing and reducing the need for additional fastening elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a plurality of components are mounted on the inner ring in a narrow installation space, then the stator vanes can be accommodated, but the inner ring design becomes complex which impairs stability and sealing continuity
Solution Approach 1:
The support device is extracted from the inner ring structure and mounted directly on the casing instead. This separates the support function from the inner ring, allowing the inner ring to have a simpler design while still accommodating multiple stator vanes through the support device mounted on the casing.
2Quantity of substance
If complex inner ring designs are used to accommodate multiple stator vanes, then the stator vanes can be mounted, but the stability and inherent stiffness of the inner ring are impaired
Solution Approach 1:
The support function is extracted from the inner ring and assigned to a separate support device mounted on the casing. This allows the inner ring to maintain its stability and stiffness while the support device handles the mounting of multiple stator vanes.
Solution Approach 2:
The support structure is segmented into a separate support device that is independently mounted on the casing, rather than being integrated into the inner ring. This segmentation allows each component to be optimized for its specific function without compromising the other.
3Ease of manufacture
If relative movement between stator vanes and casing is allowed, then assembly is easier, but load on the inner ring increases and sealing continuity is impaired
Solution Approach 1:
The support device acts as an intermediary between the stator vanes and the casing, providing a stable mounting interface that prevents relative movement. This intermediary structure distributes loads appropriately and maintains sealing continuity while allowing for proper assembly.
Data Source
AI summary
A stator vane assembly (10) and a method for assembling a stator vane assembly (10) of a turbomachine, the stator vane assembly (10) including a plurality of variable stator vanes (11) whose stator vane platform (12) has a stator vane trunnion (13) that is mounted in a receiving opening (14) of a casing (15) of the turbomachine; a stator vane head (16) of the stator vane (11) having a bearing trunnion that is mounted on an inner ring (19) disposed on a rotor (119) of the turbomachine. In the method, a stator vane trunnion (13) disposed on a stator vane platform (12) of a stator vane (11) is inserted into a receiving opening (14) of a casing (15), which receiving opening (14) is disposed radially with respect to a rotor axis of the turbomachine, and an inner ring (19) is provided on a rotor (119) of the turbomachine.