Coil Pin Damped Hinge for Gas Turbine Exhaust Liner
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exhaust duct liner suspension systems in gas turbine engines face challenges in reducing vibration, cost, and weight, particularly in variable direction exhaust ducts where the diameter restrictions at swivel bearing joints require innovative attachment solutions that allow for proper assembly and operation while maintaining structural integrity.
Innovation Solution
A suspension system comprising a hanger, a bracket, and a coil pin that provides a pivotable and damped connection, allowing the exhaust duct liner to be securely attached while accommodating the diameter restrictions at swivel bearing joints, using a coil pin made from a metal sheet wound into a spiral shape for improved fit and reduced vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rigid pin connections are used to attach exhaust duct liner suspension systems, then structural strength is maintained, but vibration increases and weight increases
Solution Approach 1:
The coil pin is designed with a coiled structure that provides inherent damping capability before vibration occurs. The coiled configuration allows the pin to deform elastically and absorb vibrational energy, reducing the transmission of vibrations through the suspension system while maintaining structural integrity under load.
Solution Approach 2:
The invention changes the physical parameters of the connection pin from a rigid straight form to a coiled elastic form. This parameter change transforms the pin's mechanical properties, enabling it to provide both structural strength and vibration damping through its elastic deformation characteristics.
2Strength
If traditional solid pins are used for hinge connections, then connection strength is sufficient, but manufacturing cost and weight increase
Solution Approach 1:
The coil pin utilizes a flexible coiled structure made from sheet material rather than a solid rigid pin. This flexible coil configuration provides the necessary connection strength through elastic deformation while using significantly less material, reducing both manufacturing cost and weight compared to traditional solid pins.
Solution Approach 2:
The invention employs a composite approach by forming the coil pin from coiled sheet material, creating a structure that combines the strength of metal with the efficiency of a spring-like configuration. This composite structure achieves required strength levels with reduced material usage, lowering manufacturing costs.
3Adaptability or versatility
If variable direction exhaust ducts with swivel bearing joints are used, then thrust direction control is improved, but the diameter restriction at joint locations increases assembly complexity
Solution Approach 1:
The coil pin provides a dynamic connection that allows for movement and adjustment during assembly. Its elastic coiled structure accommodates the diameter restrictions at swivel bearing joints by deformable connection, enabling easier assembly of variable direction exhaust ducts while maintaining thrust direction control capability.
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 suspension system effectively reduces vibration, lowers production costs, and maintains structural integrity by providing a reliable and efficient attachment method that can withstand operational temperatures, enhancing the performance and durability of exhaust duct liner systems.
Implementation Method 1
The coil pin is formed from a metal sheet that is wrapped to form a coil. The coil pin provides a dampened connection between the hanger and the bracket.
Implementation Method 2
The coil pin also provides a dampened connection between the hanger and the bracket.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
The present invention is directed toward a suspension system for mounting an exhaust duct liner within an exhaust duct of a gas turbine engine. An exhaust liner suspension system comprises a hanger, a bracket and a coil pin. The hanger comprises a first end for connecting with an exhaust duct and a second end having a hinge pin socket. The bracket comprises a base for connecting with an exhaust duct liner and a pedestal having a hinge pin bore. The coil pin is insertable in the hinge pin socket and the hinge pin bore thereby pivotably connecting the hanger and the bracket. The coil pin also provides a dampened connection between the hanger and the bracket.