Gas Turbine Heat Shield Individual Replacement
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Solution Overview
Problem
Existing heat shield arrangements for gas turbines require the entire chain of heat shields to be dismantled for maintenance, leading to high work and material costs, as well as the risk of damaging intact shields during replacement.
Innovation Solution
A heat shield arrangement with a recess in the peripheral side that allows for individual replacement by accessing the fastening bolt from the outside, using a retaining plate to distribute pressure evenly and prevent direct contact with the heat shield, and incorporating cooling features to extend service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat shields are attached in rows using holders that are pushed into grooves on the support structure, then the heat shields can be securely fastened to the supporting structure, but the entire chain of heat shields must be dismantled for maintenance, leading to high work and material costs
Solution Approach 1:
The heat shield attachment system is segmented into modular components: the heat shield itself, a fastening bolt with retaining plate, and a recess in the support structure. This segmentation allows individual heat shields to be independently accessed and replaced by removing only their specific fastening bolt, rather than dismantling an entire chain of interconnected shields.
Solution Approach 2:
The fastening bolt and retaining plate are extracted as separate, removable components from the heat shield assembly. The retaining plate is positioned in a recess on the support structure, allowing the fastening bolt to be individually removed from each heat shield location. This extraction enables maintenance personnel to access and replace individual fasteners without affecting adjacent heat shields.
2Ease of repair
If the entire chain of heat shields is dismantled for maintenance, then an individual heat shield can be replaced, but this leads to high material costs due to replacement of undamaged shields and longer working hours
Solution Approach 1:
The attachment system is divided into independent modular units, each with its own fastening bolt and retaining plate. This modular segmentation allows maintenance personnel to access and replace individual heat shields by removing only the specific fastening bolt for that shield, eliminating the need to dismantle the entire chain and significantly reducing maintenance time.
Solution Approach 2:
The fastening bolt is extracted as a separate, individually accessible component. By positioning the retaining plate in a recess and using a protruding fastening bolt, the system allows the bolt to be removed independently for each heat shield location, enabling quick replacement of only the damaged component rather than the entire assembly.
3Ease of repair
If the entire chain of heat shields is dismantled for maintenance, then an individual heat shield can be replaced, but this increases work costs due to high material costs and longer working hours
Solution Approach 1:
The heat shield attachment system is segmented into independent modular components with individual fastening bolts and retaining plates. This segmentation enables cost-effective maintenance by allowing replacement of only the damaged heat shield and its associated fastening components, rather than requiring replacement of entire chains of heat shields, thereby significantly reducing material costs.
Solution Approach 2:
The fastening bolt and retaining plate are extracted as separate, replaceable components. This extraction allows maintenance personnel to selectively replace only the damaged heat shield and its fastening components, eliminating the need to replace undamaged shields and reducing both material costs and labor costs associated with extensive dismantling and reassembly.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The arrangement has a heat shield (22) with a cooling side (26), which overlies on a support structure (28), and a heating side (24), which is opposite to the cooling side. A circumferential side connects the cooling side with the heating side. A recess (32) extends in a direction perpendicular to a cavity, where the recess extends from the cavity to the cooling side. A fastening bolt is inserted into the recess for fastening the heat shield to the support structure.