Measuring method for static balance of turbine vane wheel and device thereof

Abstract

The invention relates to a static balance measuring technique for a turbine vane wheel, which belongs to the technical field of precision finishing and measuring. The device comprises a vane wheel, a driving motor, a torque sensor, a data-processing system, an air journal bearing, an air journal bearing supporting mechanism, air-bearing guide ways, an air-bearing guide way supporting mechanism, a hydro bearing, a constant-force generator, and a hydro bearing supporting mechanism. The driving motor is used for driving the air journal bearing, driving the vane wheels for uniform rotation, measuring the output torque of the driving motor during one circle of rotation of the vane wheels, and calculating the amount of unbalance of the vane wheels so as to remove the amount of unbalance quantificationally. The invention has the advantages that the independent rotation of the vane wheels eliminates the system error caused by the amount of unbalance of other parts; fluid lubrication adopted in the main running gear of the measuring system greatly decreases kinetic friction force, reduces the minimum amount of unbalance of measurable vane wheel, improves measurement precision and sensitivity, realizes quantification of measuring results by transmission and measurement of toque, and raises working efficiency. The invention can be widely applied to the checkout gear of static balance for the turbine vane wheel.

Description

technical field [0001] The patent of the present invention relates to a static balance measurement technology of a steam turbine impeller, which belongs to the field of precision measurement technology and can be widely used in the static balance detection and measurement devices of disk-type rotary parts. technical background [0002] The steam turbine impeller usually works under high temperature (600°C), high pressure (25MPa) and high speed (3000r / min). The static balance performance of the steam turbine impeller not only has an important The working efficiency, safety status, vibration characteristics and service life of the unit also have a direct impact. The impeller with poor static balance performance will increase the noise and vibration of the moving part, and will generate a large unbalanced moment under high-speed working conditions, which will affect the straightness of the main shaft of the steam turbine generator set, and will bend the main shaft in severe cas...

AI Technical Summary

Problems solved by technology

The hydraulic support method greatly reduces the friction of the support surface, can greatly improve the accuracy and sensitivity of the measurement, and can also realize automatic measurement. It also eliminates the principle system error in the top support method through relative measurement. However, in the hydraulic In the support method, the movement direction of the deflection of the impeller tooling and the detection direction of the sensor are not on the same straight line. The measured value of the sensor is actually the component of the vector signal of pressure or displacement in the detection direction of the sensor. The deflection process will also cause the impeller The distance between the center and the sensor changes. At this time, the calculation of the measurement results contains two principle errors, which cannot be eliminated. These two errors restrict the further improvement of the measurement accuracy and accuracy of this method, and are also its biggest problem. shortcoming

Images