Compressor stator vane adjustment mechanism

Abstract

The invention aims to provide a gas compressor stator blade adjusting mechanism so that movement of linkage rings and pull rods can be simplified. The gas compressor stator blade adjusting mechanism comprises the pull rods, the linkage rings and rocker arms. One end of each pull rod is used for receiving rotational motion, and the other end of each pull rod is connected with the corresponding linkage ring so that the linkage ring can be driven to rotate. The linkage rings are arranged on a machine case and can rotate circumferentially. The rocker arms are used for being connected with the shaft part of a stator blade and the linkage rings. The rocker arms are arm bodies with the variable lengths. The axial degree of freedom of the linkage rings on the machine base is constrained.

Description

technical field [0001] The invention relates to an adjustment mechanism of a compressor stator vane. Background technique [0002] Variable Stator Vane, referred to as VSV (Variable Stator Vane), is a stator vane whose installation angle can be changed according to the operating conditions of the engine. The main purpose of applying VSV to the engine is to improve the working stability of the engine and prevent surge. The VSV adjustment mechanism is used to drive the adjustable stator blades to rotate, change the installation angle of the adjustable stator blades, adjust the flow rate of the cascade and the angle of attack of the airflow behind the cascade, so as to ensure the normal and stable operation of the high-pressure compressor. [0003] The VSV regulating mechanism is widely used in high-pressure compressors of various types of aero-engines, generally, there are torsion bar-type VSV regulating mechanism and crank-connecting rod-type VSV regulating mechanism. The t...

AI Technical Summary

Problems solved by technology

During the movement, the rocker arm of the two mechanisms swings around the rotation axis of the adjustable stator blade, and the linkage rotates around the engine axis. The movement coordination between the two requires the linkage ring to move along the engine axis. At the same time, joint bearings or rocker Arm deformation to compensate, linkage ring and pull rod do complex three-dimensional space movement, resulting in complex movement of the whole mechanism, complex relationship between actuator stroke and rocker arm rotation angle, often requires a series of assumptions in design, low precision and low reliability

The force analysis shows that the rotational arm of the linkage ring and the adjustable stator blade is equal to the distance between the rotation axis of the adjustable stator vane and the plane of the linkage ring. During the movement, the linkage ring moves axially and is close to the rotation axis of the adjustable stator blade. The continuous reduction of the arm leads to a continuous decrease in the force transmission efficiency; the three-dimensional space movement of the linkage ring and the tie rod causes the loss of force transmission components in many places between the components, resulting in low efficiency of the entire mechanism, requiring a larger initial input force of the actuator. Also increases the internal stress of the member

Images