Measurement method of turbine blade rotation angle based on level gauge

Abstract

The invention discloses a level gauge-based water turbine blade rotation angle measurement method. The method comprises selecting two reference points at two ends of a top center line of a blade, measuring a linear distance L1 of the two reference points, initializing a blade servomotor stroke to obtain an initial blade rotation angle beta, adjusting the blade servomotor stroke through an oil pressure unit, respectively measuring altitudes of the two reference points of each one of the blades relative to the same reference plane A in each current blade servomotor stroke through a level gauge, calculating the altitude difference delta H of the two reference points and calculating a blade rotation angle beta in each current blade servomotor stroke according to a function of beta=arcsin(delta H / L1). The method can detect internal transmission part replacement-caused blade initial angle and blade total rotation angle deviation before and after Kaplan turbine disintegration overhaul, ensure blade initial angle consistency and blade rotation angle uniformity after Kaplan turbine overhaul, is conducive to water turbine stable operation and has the advantages of simple processes and measurement accuracy.

Description

technical field [0001] The invention relates to a blade rotation angle measurement technology of a rotary paddle water turbine in the hydropower industry, in particular to a water turbine blade rotation angle measurement method based on a level gauge. Background technique [0002] Turbine equipment manufacturers usually pre-assemble the turbine runners before delivery, classify and mark the corresponding transmission parts of each blade, and then disassemble and transport them to the turbine installation and construction site. The markers are reassembled. Newly commissioned units generally do not need to do this project. After the turbine has been running for a period of time, due to the wear and tear of the relevant mechanical parts, the blade rotation angle of the turbine may also change. Excessive deviation will result in insufficient output, reduced efficiency and poor stability of the turbine. Therefore, it is necessary to adjust and correct the blade rotation angle a...

AI Technical Summary

Problems solved by technology

However, there is a lack of corresponding advanced measurement tools at the maintenance site, and it is impossible to determine the exact position of the centerline of the blade rotation, and it is very difficult to accurately measure the blade rotation angle

Generally, this measurement item is not used, or a simple angle measurement is performed by placing an angle meter on the blade. This method is greatly affected by the surface position and deformation degree of the blade, and the measured value is inaccurate or even deviates greatly.

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