Gas Turbine Nozzle Pipe Support for Vibration and Thermal Expansion
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Solution Overview
Problem
The existing pipe support structures for nozzle pipes in gas turbines are complex and costly due to the large number of nozzle pipes, leading to increased manufacturing and maintenance costs, and they struggle to effectively suppress vibration while allowing thermal elongation.
Innovation Solution
A pipe support structure that includes a projecting portion on the nozzle pipes and a support member with a guide groove, which allows the projecting portion to guide in the thermal elongation direction of the pipes, providing stable support and vibration suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex pipe support structure with stoppers and coil springs is used to suppress vibration, then vibration suppression is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The support structure is segmented into a header support and individual nozzle pipe supports. Each nozzle pipe is supported independently at its lower end by the header, allowing simplified support mechanisms while maintaining overall system stability and vibration suppression
Solution Approach 2:
The invention extracts and eliminates unnecessary components from the support structure. By removing the complex stopper and coil spring mechanisms, the design achieves vibration suppression through the geometric arrangement and gravitational positioning of the nozzle pipes alone
2Stability of the object's composition
If multiple support points are provided for the pipe, then support stability is improved, but thermal elongation damage risk increases due to differential expansion
Solution Approach 1:
The support structure is designed to be dynamic rather than rigid. The nozzle pipes are freely supported at their lower ends, allowing them to expand and contract thermally without constraint while maintaining stable positioning through gravity and geometric arrangement
Solution Approach 2:
Different parts of the pipe system have different support characteristics. The header is supported at multiple points for stability, while the nozzle pipes are supported only at their lower ends to allow free thermal expansion, creating localized support qualities that address both stability and thermal expansion needs
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution simplifies the pipe support structure, reduces costs, and effectively suppresses vibration while allowing thermal elongation of the pipes, enhancing the operational stability of gas turbines.
Implementation Method 1
there is a concern that the pipe will be damaged due to a difference in the amount of thermal elongation between the pipe and a support member
Implementation Method 2
coil springs that bias the stoppers toward the support main body
Data Source
AI summary
The support structure of the present disclosure is a piping support structure that supports piping comprising: a header pipe extending in a first direction within a cross section of a duct and having an inlet formed therein through which a high-temperature fluid flows; and a plurality of nozzle pipes integrally provided with the header pipe, extending in a second direction orthogonal to the first direction, and arranged in the first direction. The support structure comprises: ridges protruding from surfaces on at least one side of the outer peripheral surfaces of the nozzle pipes in a third direction orthogonal to the first direction and the second direction; and a support member fixed to the duct and having formed therein a guide groove to which the ridge is fitted and which guides the ridge in the direction of heat extension of the header pipe and the nozzle pipes.