Multi-feature fusion based axial flow fixed-blade type generator set thrust bearing protection method

Abstract

The invention discloses a multi-feature fusion based axial flow fixed-blade type generator set thrust bearing protection method. The multi-feature fusion based axial flow fixed-blade type generator set thrust bearing protection method includes the steps that dynamic axial displacement amount, thrust block overturning angle, thrust pad inclination and thrust runner wave degree of a water-turbine generator set and non-perpendicular degree of a main shaft and a thrust runner are measured and calculated; and if anyone of the conditions that the dynamic axial displacement amount is greater than a preset dynamic axial displacement amount threshold value, the thrust block overturning angle is greater than a preset thrust block overturning angle threshold value, the thrust pad inclination is greater than a preset thrust pad inclination threshold value, the thrust runner wave degree is greater than the preset thrust runner wave degree threshold value, and the non-perpendicularity degree of themain shaft and the thrust runner is greater than a preset non-perpendicularity threshold value of the main shaft and the thrust runner occurs, an alarm signal is output. The operating state and healthstatus of a thrust bearing of a unit are more comprehensively reflected, so that potential defects and problems existing in the thrust bearing operation can be accurately evaluated and predicted, andthe stability and safety of the thrust bearing operation can be ensured.

Description

technical field [0001] The invention relates to the field of thrust bearings of axial-flow hydroelectric generator sets. More specifically, the present invention relates to a method for protecting the thrust bearing of an axial-flow fixed-propeller generator set based on multi-feature fusion. Background technique [0002] Axial flow turbine refers to the impact turbine in which the water flow enters the runner from the axial direction and flows out from the axial direction along its blades, converting the energy of the water flow into mechanical energy. As a key component of the axial flow hydroelectric generator, the thrust bearing provides support for the weight of the rotating part and water thrust of the hydroelectric generator set, and its operating state directly determines the safety and stability of the unit operation. Statistics on the failure of foreign hydroelectric generator sets show that the accident shutdown of the unit due to the failure of the bearing (thru...

AI Technical Summary

Problems solved by technology

Due to the lack of effective monitoring means for thrust bearings, it is impossible to achieve effective monitoring, positioning and early warning of faults

[0003] At present, the monitoring of thrust bearings at home and abroad is mainly focused on the monitoring of thrust pads, and this monitoring is still in its infancy. Most monitoring systems only stay at the monitoring of thrust pad temperature and oil temperature. For other important thrust bearings Operating parameters, such as core monitoring parameters such as mirror plate waviness, unit lifting amount, improper fit of thrust head mirror plate, non-perpendicular main shaft and mirror plate, and thrust tile inclination and tilt azimuth, are still in a blank stage, and it is difficult to implement online monitoring , and still needs further development and research

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