Vane Ring Assembly Fixing Compressor Vibration and Wear
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Solution Overview
Problem
Compressor vanes in gas turbines experience vibration and wear due to airflow-generated vibrations and transmitted vibrations through the compressor casing, leading to reduced fastening force at the joints between the vanes and the casing.
Innovation Solution
A vane ring assembly with a retaining ring and fixing parts, including dovetail grooves and set screws, securely fastens vanes to the ring, preventing movement and vibration by engaging the dovetail portions with the grooves and using elastic intermediate members or coating layers to inhibit wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compressor vanes are fixed to the compressor casing using conventional methods, then the vanes can be held in place, but vibration and wear occur at the joints between the vanes and the casing, reducing fastening force
Solution Approach 1:
The fixing structure is divided into multiple components: fixing parts with fastening elements (such as set screws or bolts), elastic intermediate members (such as rubber or spring elements), and coating layers. This segmentation allows each component to perform its specific function - mechanical fastening, vibration absorption, and wear protection - thereby resolving the contradiction between maintaining fastening force and preventing vibration-induced wear.
Solution Approach 2:
Elastic intermediate members are introduced as mediators between the fixing parts and the vane-casing interface. These intermediate members absorb vibration energy and reduce the transmission of vibrational forces to the joint interfaces, thereby preventing wear while maintaining the fastening force of the vanes to the casing.
2Reliability
If the vanes are firmly fixed to prevent vibration, then reliability improves, but assembly and disassembly for maintenance becomes more difficult
Solution Approach 1:
The fixing structure employs dynamic elements such as elastic intermediate members and adjustable fastening mechanisms that allow for easy assembly and disassembly while maintaining firm fixation during operation. The elastic components can be compressed or expanded to facilitate installation and removal, whereas the rigid fixation is achieved when the components are assembled, thus resolving the contradiction between ease of repair and vibration prevention.
Solution Approach 2:
The use of standardized, replaceable fixing parts with simple fastening mechanisms (such as set screws or clips) allows for quick replacement during maintenance without requiring complex tools or procedures. These fixing components can be easily installed and removed, facilitating routine maintenance while ensuring reliable vibration prevention during operation.
Data Source
AI summary
A vane ring assembly, and a compressor and gas turbine including the vane ring assembly, can prevent vibration of vanes and inhibit wear of the vane due to vibration by firmly and tightly fixing the vanes in contact with a ring. The vane ring assembly includes a retaining ring having inner and outer sides extending in a circumferential direction; a plurality of vanes respectively disposed around the inner side of the retaining ring and configured to be fastened to the retaining ring; and a plurality of fixing parts configured to be fastened to a surface of each vane, by passing through the retaining ring to fix the vanes to the inner side of the retaining ring.