Oil film thickness monitoring device for thrust bearing of water-turbine generator set

Abstract

The invention provides an oil film thickness monitoring device for a thrust bearing of a water-turbine generator set. The water turbine generator set comprises a runner plate; and a thrust bearing includes a plurality of thrust pads for supporting the runner plate upwards. The oil film thickness monitoring device comprises distance detection devices, strain detection devices, a data collection andconditioning device, and a data processing device. The distance detection devices installed at the thrust pads are used for detecting distances L0 and L1 between the induction terminals of the distance detection devices and the bottom face of the runner plate in a shutdown state and an operation state. The strain detection devices installed on the thrust pads are used for detecting deformation quantities S of the thrust pads in the axial direction of the thrust bearing when the set switches the state from the shutdown state to the operation state or the working condition in the operation state is changed and defines the tensile deformation of the S to be a positive value and compressive deformation to a negative value. The data collection and conditioning device carries out communicationwith the distance detection devices and the strain detection devices to collect and regulate detection signals to form detection data. The data processing device receives the detection data and calculates an oil film thickness f between the top surface of each thrust pad and the bottom surface of the runner plate according to the following formula: f=L1-L0-S.

Description

technical field [0001] The invention relates to the technical field of hydropower generation, in particular to an oil film thickness monitoring device for a thrust bearing of a hydroelectric generator set. Background technique [0002] The health status and performance of the thrust bearing of the hydro-generator set directly affect the operation safety and performance of the unit. The thrust bearing bears axial loads such as the weight of the rotating parts of the generator and the axial water thrust of the turbine. Specifically, the thrust pad of the thrust bearing is used to support the mirror plate of the generator upward. When the unit is shut down, the top surface of the thrust pad is in direct contact with the bottom surface of the mirror plate, and the distance is zero. When the unit is running, lubricating oil is filled between the top surface of the thrust pad and the bottom surface of the mirror plate to form an oil film. Oil film thickness is an important param...

AI Technical Summary

Problems solved by technology

However, when the above method is used to measure the oil film thickness of the real unit at the site of the hydropower station, there are often obvious inaccurate data such as the oil film thickness is not zero when the machine is shut down, which makes it difficult to monitor the oil film thickness.

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