Method and device for measurement of gap between full-circle guide blade thrusting pressure plate and guide blade wall

Abstract

The present invention discloses a method and device for measurement of a gap between a full-circle guide blade thrusting pressure plate and a guide blade wall. A guide blade arm is lifted through a bracket, the gap between the full-circle guide blade thrusting pressure plate and the guide blade wall is converted to the lifting distance of the guide blade arm, and the lifting distance of the guide blade arm is monitored through an indicating gauge. The device provided by the invention comprises a bracket (1), mounting holes (7) are installed at two ends of the bracket (1), and bolts (2) are connected with the mounting holes (7); a connecting hole (8) is arranged at the middle of the bracket (1), and a jack device (9) is connected with the connecting hole (8) and contacts with a guide blade (5); the bracket (1) is connected with the guide blade arm (3) through the bolts (2), and the guide blade arm (3) is provided with the indicating gauge (10). The method and device for measurement of a gap between a full-circle guide blade thrusting pressure plate and a guide blade wall are simple in operation and accurate in measurement, and is able to improve the installation precision of a unit guide blade thrusting pressure plate, perform energy saving and consumption reduction and reduce the maintenance cost and the maintenance workload.

Description

technical field [0001] The invention relates to a method and device for measuring the clearance between a thrust pressing plate and a guide vane arm, in particular to a method and a device for measuring the clearance between a thrust pressing plate and a guide vane arm of a full-circle guide vane. Background technique [0002] The traditional thrust plate of the guide vane is made of two pieces, and the thrust range of the guide vane arm is generally 1 / 2 to 2 / 3. The gap between the thrust plate and the guide vane arm is measured directly from the side with a feeler gauge. In recent years, the phenomenon of guide vanes scraping the top cover has frequently occurred in pumped storage power stations. The reason is that the push plate is manufactured in two parts, and its rigidity is insufficient and the structure has defects. However, pumped storage units are mostly high-head and high-speed units, and the thrust acting on the thrust plate is much higher than that of conventiona...

AI Technical Summary

Problems solved by technology

However, since the thrust plate adopts a full-circle structure, the thrust gap is closed inside and cannot be directly measured with a feeler gauge, so it is impossible to accurately measure the gap, which will affect the installation accuracy of the full-circle guide vane thrust plate

When the thrust gap is too large, the full-circle thrust plate will lose its thrust effect, and the guide vane will float up, resulting in large water leakage from the end face seal of the guide vane. The rotation of the unit consumes a lot of energy; and the sealant on the upper end of the guide vane, the upper end of the guide vane and the lower end of the top cover will be severely scratched, which will reduce the safety of the turbine when it is working, increase the maintenance cost and increase the workload of maintenance; In addition, the floating of the guide vane will increase the wear of the thrust plate, and the gap needs to be readjusted during the maintenance of the unit, which will increase the workload of maintenance

At the same time, since the top cover will be subjected to the operating force of the servomotor, when the guide vane floats up, its verticality will change, causing the guide vane to tilt, causing the thrust plate to bear force on one side and reducing the effect of the limit

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