Variable-Pitch Blade Control Ring Alignment via Pivoting Axis Integration
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Solution Overview
Problem
The existing control devices for variable-pitch blades in turbomachines suffer from imprecision due to manufacturing and assembly tolerances, leading to variations in the relative positioning of the cylinder and control shaft, resulting in inaccuracies in the angular pitch of the blades during maintenance and reassembly operations.
Innovation Solution
The control device features a cylinder pivoting axis carried by the control shaft's supporting members and at least one tab attached to the casing, with a second tab having an eccentric guide ring and radially grooved washers to maintain parallelism and precise positioning, ensuring consistent alignment post-maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the cylinder is pivotably mounted independently from the control shaft supporting members, then the device allows maintenance disassembly and reassembly, but manufacturing and assembly tolerances cause variation in relative positioning between cylinder and control shaft
Solution Approach 1:
The invention merges the cylinder pivoting axis mounting with the control shaft supporting members by having the pivoting axis carried by these supporting members. This integration ensures that the cylinder and control shaft share common reference elements, eliminating relative positioning variations caused by independent mounting tolerances while maintaining ease of maintenance through the same support structure.
2Device complexity
If the cylinder pivoting axis is carried by independent mounting means, then the structure is simpler, but the relative positioning precision deteriorates due to tolerance accumulation
Solution Approach 1:
The mounting structure combines the functions of supporting the control shaft and carrying the cylinder pivoting axis into a single integrated system. The control shaft supporting members simultaneously perform both functions, eliminating the need for separate independent mounting means while maintaining structural simplicity and achieving high positioning precision.
3Ease of manufacture
If the cylinder and control shaft are mounted independently, then assembly is easier, but the angular pitch control precision of guide blades deteriorates
Solution Approach 1:
The invention combines the mounting of the cylinder and control shaft through common supporting members, ensuring that their relative positions remain precisely defined during assembly. This integrated approach maintains assembly ease while eliminating the tolerance accumulation that would otherwise degrade angular pitch control precision of the guide blades.
Data Source
AI summary
A device for controlling variable-pitch blades in a turbomachine compressor, including at least one control ring surrounding an external casing of the compressor, and a control shaft connected to the ring and to the rod of an actuator, the body of which is mounted such that it can pivot about an axle borne by a support mechanism of the control shaft so as to guarantee a precise relative positioning of the axis of pivoting of the actuator with respect to the control shaft.