Pivoting Ball Stop Exhaust Duct Liner Hanger
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Solution Overview
Problem
Existing exhaust duct liner attachment systems in gas turbine engines face challenges in maintaining proper spacing and alignment between exhaust ducts and liners due to differing temperature and pressure gradients, leading to potential overheating and misalignment, and require complex installation processes.
Innovation Solution
A hanger system comprising a bracket, a disk, and a rod with pivoting ball stops that allows for radial, circumferential, and axial displacement of the liner within the duct, facilitating easy installation and accommodating thermal expansion without inducing additional stress, using a pivoting ball stop mechanism that connects the exhaust duct and liner through a spherical button and collar configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If support members are carefully inserted through holes in the exhaust duct or liner to maintain alignment, then proper spacing between duct and liner is maintained, but installation complexity increases
Solution Approach 1:
The hanger system employs a pivoting mechanism that allows the support members to dynamically adjust their position and angle. The pivot joint enables the hanger to rotate and adapt to thermal expansion and misalignment, maintaining proper spacing without requiring precise pre-positioning during installation.
Solution Approach 2:
The hanger system changes the physical state from rigid fixed positioning to flexible pivoting positioning. By allowing angular movement and position adjustment, the system transitions from requiring high installation precision to accommodating a range of positions while maintaining functional alignment.
2Manufacturing precision
If rigid connection is used between exhaust duct and liner to maintain spacing, then alignment is maintained, but thermal expansion and stress increase
Solution Approach 1:
The pivoting hanger mechanism transforms the rigid connection into a dynamic joint that can rotate and pivot. This allows the connection to maintain proper spacing while accommodating thermal expansion and contraction movements, reducing stress on the duct and liner structures.
Solution Approach 2:
The hanger system explicitly accounts for thermal expansion by providing pivoting joints that allow movement as temperatures change. The mechanism absorbs thermal growth and contraction forces through controlled pivoting motion, preventing stress buildup in the exhaust duct and liner.
3Adaptability or versatility
If complex alignment mechanisms are used to accommodate three-dimensional forces, then proper spacing is maintained under varying conditions, but device complexity increases
Solution Approach 1:
The hanger system divides the support function into discrete modular units. Each hanger is an independent component with standardized pivot joints and mounting features, allowing the system to accommodate three-dimensional forces through multiple simple units rather than one complex mechanism.
Solution Approach 2:
The pivoting hanger mechanism serves multiple functions simultaneously: it maintains proper spacing, accommodates thermal expansion, absorbs misalignment forces, and allows for installation adjustment. This multi-functionality is achieved through a relatively simple pivoting joint design rather than multiple specialized components.
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 hanger system effectively maintains alignment and spacing between the exhaust duct and liner, allowing for thermal expansion while reducing assembly complexity and stress on the liner, ensuring optimal performance and durability by accommodating temperature gradients without additional strain.
Implementation Method 1
the exhaust duct and liner are subjected to different pressure and temperature gradients, which results in differing deflections and expansions of each body
Data Source
AI summary
A hanger for suspending a liner within an exhaust duct of a gas turbine engine comprises a bracket, a disk and a rod. The bracket is for connecting to an exhaust duct liner of the gas turbine exhaust system. The disk is slidably engaged with the bracket. The rod is for connecting to an exhaust duct of the gas turbine engine. The rod is pivotably connected to the disk.