Variable Guide Vane Control System with Additional Pivoting Member

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Solution Overview

Problem

Existing control systems for variable-pitch blade stages in turbomachines cannot accurately reproduce correlation curves with sudden accelerations or decelerations in the terminal part, limiting their ability to meet complex aerodynamic requirements.

Innovation Solution

A control system for turbine engine variable-pitch stator vanes that includes an additional pivoting member interposed between the follower member and the follower ring, featuring a guide rod sliding in a ring pivotally mounted on the housing, allowing for localized acceleration or deceleration of the control trajectory by adjusting the pivot point's location.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a conventional control system with control ring and links is used, then the structure is simple and easy to manufacture, but it cannot reproduce correlation curves with sudden acceleration or deceleration

Engineering Contradiction:

Improveability to reproduce complex correlation curvesVSAvoidcontrol system structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent introduces an additional pivoting member as an intermediary element between the follower member and the follower ring. This intermediate component enables the transmission of modified motion characteristics, allowing the system to reproduce correlation curves with sudden acceleration or deceleration while maintaining the overall simplicity of the control system architecture.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If the pivot point of the additional pivoting member is moved to create acceleration, then the control trajectory gains localized acceleration, but the device complexity increases

Engineering Contradiction:

Improvecontrol trajectory speed variationVSAvoidadditional pivoting member configuration

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The patent applies local quality by positioning the pivot point of the additional pivoting member at specific locations to create localized acceleration or deceleration effects only in certain zones of the control trajectory. This allows different parts of the motion path to have different speed characteristics, enabling precise control over where acceleration occurs without affecting the entire system uniformly.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP1724472B1Control system for variable guide vane stages of a turbomachine

Publication Date: 2010.06.16 SN DETUDE & DE CONSTR DE MOTEURS DAVIATION (S N E C M A)

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AI summary

A two-stage (10, 10') variable-pitch turbomachine stator blade (14, 14') control system, comprising a drive element (24) for rotating the control ring (22) of one of the stages (10) by means of a pilot member (26) pivotally mounted on the housing (12), a synchronizing bar (30) for transmitting the rotational movement of the driven ring (22) by the drive element (24) to the control ring (22') of the other stage (10') by means of a follower member (26') pivotally mounted on the housing, and an additional pivoting member (44) interposed between the follower member (26') and the follower ring (22'), said additional pivoting member (44) being pivotally mounted on the housing (12) and on the follower organ (26').