Gas Turbine Nozzle Guide Support Using Swage-Joined Rivet
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Solution Overview
Problem
The existing structure for supporting a nozzle guide in a gas turbine engine is costly and heavy due to the need for welding a retaining plate around the entire periphery of the combustor's dome inlet, and it restricts rotation prevention, leading to increased weight and production time.
Innovation Solution
The nozzle guide is supported in a radially and axially floating state on an open flange part using swage-joining with a recess and projecting part engagement, allowing for reduced production time and cost, and preventing unlimited rotation by using a cap, rivet, and spacer or clip, which can be formed integrally with the flange part to reduce weight and component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is used to fix the retaining plate to the entire periphery of the flange, then the nozzle guide support is reliable, but production time and production cost increase
Solution Approach 1:
The retaining plate is divided into multiple discrete fastening points (rivets or spots) rather than requiring continuous peripheral welding. This segmentation allows the support structure to maintain reliability through distributed attachment while dramatically reducing production time and cost by eliminating the need for extensive welding operations around the entire flange periphery.
2Strength
If welding or brazing is used to fix the nozzle guide support means, then the connection is strong, but production time and cost increase
Solution Approach 1:
The patent replaces thermal joining methods (welding and brazing) with mechanical fastening methods such as riveting or spot welding. This substitution maintains sufficient connection strength for supporting the nozzle guide while significantly reducing production cost and time, as mechanical fastening is faster and more economical than continuous welding or brazing operations.
3Reliability
If the retaining plate is welded around the entire periphery, then the nozzle guide is securely supported, but the structure becomes heavy
Solution Approach 1:
The continuous peripheral retaining plate structure is segmented into discrete fastening points or reduced-span segments. This segmentation maintains support stability by providing adequate attachment at critical locations while removing excess material that would increase weight, achieving an optimal balance between structural reliability and weight reduction.
4Weight of stationary object
If multiple nozzle guide support means are disposed at predetermined intervals, then the total weight is reduced, but the complexity of arrangement increases
Solution Approach 1:
Multiple discrete support means are merged into an integrated structure where the retaining plate or support component incorporates multiple fastening points or support functions in a unified design. This merging approach reduces total weight by eliminating redundant separate components while avoiding increased complexity through standardized, repeatable structural motifs that simplify manufacturing and assembly.
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
This solution reduces production time and cost, minimizes weight, and effectively prevents nozzle guide rotation while allowing necessary movement, improving maintenance and assembly efficiency.
Implementation Method 1
the nozzle guide support means is fixed to the open flange part by swage-joining
Implementation Method 2
rotation of the nozzle guide relative to the open flange part is restricted by engagement between a recess portion provided in the nozzle guide and a projecting part provided on a swaged member of the nozzle guide support means
Data Source
AI summary
A nozzle guide support device, that supports a nozzle guide of a fuel nozzle on an open flange part encircling a fuel supply hole of a combustor of a gas turbine engine, is formed by fixing a cap that supports the nozzle guide in a floating state to the open flange part by means of a rivet. Rotation of the nozzle guide relative to the open flange part is restricted by engagement between a recess portion of the nozzle guide and a spacer fitted to the rivet. Accordingly, not only is it possible to cut production time and production cost compared with a case in which the nozzle guide support device is fixed by welding or brazing, but it is also possible to suppress unlimited rotation of the fuel nozzle guide while enabling the fuel nozzle guide to float in a radial direction and a axial direction.


