Flow Restrector With Bowed Retaining Ring for Gas Turbine
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Solution Overview
Problem
Flow restrictors in gas turbine engines often misassemble or shift due to vibrations, leading to operational failures and the inability to easily replace or adjust the restrictor for different flow requirements.
Innovation Solution
A flow assembly with symmetrical discs and a rod extending between them, featuring cylindrical rims and holes to prevent misassembly and ensure the flow restrictor remains functional and adjustable, utilizing a bowed retaining ring to secure the restrictor in place without permanent fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flow restrictor is permanently fixed inside the fluid passage through adhesive or braze, then the flow restrictor cannot shift or move, but the operator cannot easily replace the restrictor to adjust flow requirements
Solution Approach 1:
The flow restrictor is designed with a retaining system that allows for dynamic adjustment and removal. The restrictor can be installed, removed, and reinstalled multiple times while maintaining its functional integrity, transitioning from a static permanent fixation to a dynamic reusable configuration.
Solution Approach 2:
The flow restrictor assembly is segmented into separable components: the flow restrictor element and the retaining system. This segmentation allows the restrictor to be independently removed and replaced without replacing the entire assembly, enabling easy adjustment of flow requirements.
2Reliability
If the flow restrictor is installed through an interference fit or intricate retaining system, then the flow restrictor can be secured, but misassembly may occur leading to failure of the retaining system
Solution Approach 1:
The flow restrictor incorporates asymmetric features including a keyed portion and corresponding keyway that provide unique orientation indicators. These asymmetric elements guide proper installation orientation and prevent misassembly, eliminating the need for complex retaining systems while ensuring reliable installation.
Solution Approach 2:
The flow restrictor includes self-aligning features such as the keyed portion and keyway that automatically guide the restrictor into the correct orientation during installation. The design provides self-service by preventing misassembly through inherent geometric constraints rather than requiring external guidance or complex installation procedures.
Data Source
Figure 1
Figure 2~3
AI summary
A flow restrictor (10, 10') includes a first disc (12) and a second disc (14). A rod (16) extends between the first disc (12) and the second disc (14) and spaces the first disc (12) from the second disc (14). A first hole (18) is formed in the first disc (12).