Profiled Sealing Body with Spring Section for Gas Turbine Combustion Chambers
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Solution Overview
Problem
Existing sealing solutions for gas turbine combustion chambers fail to effectively seal the lance passage opening due to high temperatures, thermal expansion, and vibrations, leading to inadequate sealing performance.
Innovation Solution
A sealing body made from a circumferentially continuous metal sheet, deformed to form inner and outer sealing zones with prestress, providing flexibility and high-temperature resistance, and optionally using two congruent metal sheets for enhanced strength and resilience, with slots in curved sections for increased elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sealing solution is used, then the structure is simple, but the sealing performance is inadequate under high temperatures, thermal expansion, and vibrations
Solution Approach 1:
The sealing body is divided into multiple functional zones including an inner sealing zone, outer sealing zone, and spring section with slots. This segmentation allows each zone to perform its specific function - the sealing zones provide contact sealing while the spring section with slots provides elastic compensation for thermal expansion and vibrations, thereby improving sealing performance under extreme conditions.
Solution Approach 2:
The sealing body incorporates a spring section with slots that provides flexural elasticity, allowing the sealing body to deform elastically in response to thermal expansion and vibrations. This flexibility enables the sealing zones to maintain contact with the sealing surfaces despite relative movements, significantly improving sealing reliability under dynamic thermal and mechanical conditions.
2Reliability
If a rigid sealing structure is used, then the structural strength is high, but the ability to accommodate thermal expansion and vibrations is poor
Solution Approach 1:
The spring section with slots is designed to provide controlled flexibility while maintaining overall structural integrity. The slots allow the spring section to deform elastically, accommodating thermal expansion and vibrations, while the continuous metal sheet construction and deformation into a profiled section maintain sufficient rigidity to withstand operational loads and maintain sealing contact.
Solution Approach 2:
The sealing body utilizes changes in physical parameters - specifically, the elastic deformation of the spring section in response to temperature and vibration conditions. The flexural elasticity allows the structure to dynamically adjust its shape and contact pressure, maintaining sealing performance across a wide range of operating conditions without compromising structural strength.
3Temperature
If material strength is increased to withstand high temperatures, then the temperature resistance is improved, but the flexibility and elasticity are reduced
Solution Approach 1:
The spring section with slots is specifically designed to provide the necessary flexibility and elastic deformation capability while the sealing zones use materials and construction that can withstand high temperatures. The slots in the spring section enable thermal expansion and vibration accommodation without compromising the high-temperature strength of the sealing contact surfaces.
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 solution ensures reliable sealing across a wide range of relative movements and temperatures, maintaining contact between sealing surfaces despite thermal expansion and vibrations, while withstanding high operational loads.
Implementation Method 1
The profiled section presents a spring section which yields resiliently inward and presses the outer sealing zone onto the inner sealing surface in the installed state
Implementation Method 2
The use of a metal sheet for producing the sealing body makes the latter able to withstand high temperatures, enabling it to cope with, for example, the temperatures that occur when a burner is operating
Implementation Method 3
the seal has to be able to withstand the high temperatures which occur in operation... extreme thermal expansion or contraction effects which occur when the combustion chamber or gas turbine is being run up and shut down
Data Source
AI summary
The present invention relates to a sealing body for sealing an outer component with respect to an inner component, in particular for a combustion chamber of a gas turbine. The outer component has a passage opening, through which the inner component projects out of the outer component. In the installed state, the sealing body is arranged in the region of the passage opening, surrounds the inner component in a circumferentially continuous manner, bears in a circumferentially continuous manner, by means of an inner sealing zone, against an outer sealing surface of the inner component and bears in a circumferentially continuous manner, by means of an outer sealing zone, against an inner sealing surface of the outer component. The sealing body is produced by deformation from at least one metal sheet that is in strip form and is circumferentially continuous. The inner sealing zone and the outer sealing zone are formed at a profiled section of the sealing body along the entire circumference.