Turbojet Rotor Balancing Weight with Integrated Peg Lock
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Solution Overview
Problem
The existing methods for balancing rotating parts in turbomachines, such as turbojets, require significant axial space for nut-tightening tools, making it difficult to integrate distributor nozzles and increasing the weight of the balancing system.
Innovation Solution
A device with a balance weight mounted on an annular flange, using L-shaped hooks for engagement and a cylindrical peg with a deformable tongue for locking, eliminating the need for nut-tightening tools and reducing axial size and weight by allowing axial and rotational locking without additional tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If balance weights are fastened using bolts and nuts with tool access space, then the balance weight can be securely fastened to the annular flange, but the axial size of the turbine increases and distributor nozzle integration becomes difficult
Solution Approach 1:
The invention combines the fastening function and locking function into a single integrated locking means (peg with deformed end) that performs both attachment and security functions, eliminating the need for separate nuts and tools, thereby reducing axial dimension while maintaining fastening security
Solution Approach 2:
The invention extracts the nut and tool components from the fastening system, retaining only the essential peg element that provides both fastening and locking functions, thus removing the axial space requirement for tool access while preserving secure attachment
2Strength
If balance weights are fastened using bolts and nuts, then the balance weight can be securely attached, but the weight of the balancing system increases
Solution Approach 1:
The invention merges the fastening element (peg) and locking mechanism (deformed end) into a single integrated component, eliminating the need for separate nuts and multiple parts, thereby reducing the overall weight of the balancing system while maintaining secure attachment
Solution Approach 2:
The locking means uses a simple peg with a deformed end that can be easily manufactured and replaced if needed, using minimal material while providing sufficient locking function, thus reducing weight compared to traditional bolt-nut assemblies
3Ease of operation
If sufficient empty space is provided between the annular flange and disk for tool access, then nut tightening can be performed, but the axial size cannot be reduced and distributor nozzle placement becomes difficult
Solution Approach 1:
The invention extracts the tool and nut components from the assembly, requiring no tool access space for installation or maintenance, thereby eliminating the need for empty space between the annular flange and disk while maintaining ease of operation through simple peg insertion and deformation
Data Source
AI summary
A device for balancing a rotating part, in particular a turbine rotor in a turbomachine such as a turbojet or the like, the device comprising at least one balance weight comprising engagement means for engaging it on an annular flange of the part, and locking means associated with the balance weight and with the annular flange to prevent the balance weight from moving relative to the annular flange and to block itself against moving both in rotation and in axial translation relative to the balance weight.