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Oil film thickness measuring method of thrust bearing-babbitt metal tile for water turbine

A technology of oil film thickness and thrust bearing, which is applied in the direction of electric/magnetic thickness measurement, measuring device, electromagnetic measuring device, etc. It can solve the problems of measurement error, large error, measurement limitation of water turbine oil film thickness, etc., and achieve the effect of reducing the number of layouts

Active Publication Date: 2020-06-26
DALIAN SANHUAN COMPOSITE MATERIAL TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the eddy current displacement sensor is susceptible to measurement errors caused by the material itself, defects, machining and other reasons. The large error of the initial calibration also leads to certain limitations in the measurement of the thickness of the hydraulic turbine oil film.

Method used

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  • Oil film thickness measuring method of thrust bearing-babbitt metal tile for water turbine
  • Oil film thickness measuring method of thrust bearing-babbitt metal tile for water turbine
  • Oil film thickness measuring method of thrust bearing-babbitt metal tile for water turbine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] On the test unit with the installed sensor, the mirror plate is rotated by manual cranking, 22.5°, and after standing still for 10 minutes, the average value of the corresponding actual values ​​of all eddy currents at 16 positions is recorded by the encoder as the initial value. 1 Oil inlet end eddy current displacement sensor 1, #1 oil outlet eddy current displacement sensor 2, #5 oil inlet eddy current displacement sensor 3, #5 oil outlet eddy current displacement sensor 4 The specific data measured are shown in the table 1

[0043] Table 1. The tie value of the actual value of the 16 position points after 3 weeks of manual cranking

[0044]

[0045] Operate at 600r / min with a load of 4MPa. When all parameters are stable, record the numerical curves measured by each sensor on the 1# tile as follows: image 3 shown.

Embodiment 2

[0047] This embodiment is intended to verify the correctness of calculating the oil film thickness of other tiles in step 5 based on the two babbitt tiles with eddy current displacement sensors.

[0048] On the basis of Example 1, run under the steady state, keep the rotating speed and load of the test unit constant, change the cooling capacity, make the oil film temperature change, and obtain such as Figure 4 The relationship curve between oil film thickness and oil film temperature of 1# tile thrust bearing is shown.

[0049] In Example 1 of image 3 Among them, the oil film thickness measured at the oil inlet end of 1# tile is 0.107mm, and the oil film thickness at the oil outlet end is 0.035mm. At this time, the oil film temperature of 1# measured by #1 temperature sensor 5 is 63.5°C; in the embodiment In 2, when the oil film temperature of the 1# tile is 63.5°C, the oil film temperature of the 5# tile measured by the #5 temperature sensor 6 on the host computer is 62.6°...

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Abstract

The invention provides an oil film thickness measuring method of a thrust bearing-babbitt metal tile for a water turbine. According to the method, the thickness of the oil film is measured through eddy current displacement sensors installed at the oil inlet end and the oil outlet end of the fan-shaped babbitt metal tile. In the prior art, an eddy current displacement sensor is used for measuring the thickness of an oil film; the characteristic of zero drift of eddy current exists, namely the characteristic of difficulty in calibration. According to the invention, the angle measurement encoderis adopted, a plurality of zero points are adopted for rotation through high-speed collection and processing, a plurality of factors influencing the measurement precision of the eddy current displacement sensor are eliminated, the eddy current zero point selection problem in the measurement process of a hydraulic turbine set is solved, initial calibration is completed, and the oil film thickness measurement of the babbitt metal thrust bearing is realized. By establishing the function relationship between the oil film thickness at the oil inlet end and the oil outlet end of the thrust bearing and the oil film temperature, the measurement and calculation of the whole set of thrust bearing oil film are completed, and the arrangement number of sensors and the complexity of system hardware arereduced.

Description

technical field [0001] The invention relates to the technical field of bearing detection, in particular to a method for measuring the oil film thickness of a babbitt alloy thrust bearing for a water turbine. Background technique [0002] As a key basic component, the thrust bearing plays an important role in ensuring the normal operation of the equipment during operation. The state of the oil film of the thrust bearing reflects the operating state of the equipment to a large extent, so it is of great significance to accurately measure the thickness of the oil film. As early as the 1970s and 1980s, people had done in-depth research on the oil film pressure distribution and oil film thickness theoretical calculation of lubricating oil, and there were few problems in the actual application of thrust bearings. At present, there are many methods for measuring the oil film thickness of thrust bearings, including resistance method, capacitance method, optical interference method, ...

Claims

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Application Information

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IPC IPC(8): G01B7/06G01B21/08
CPCG01B7/105G01B21/085
Inventor 杨亮宗宇彬黄旭陶鹏双文林茂
Owner DALIAN SANHUAN COMPOSITE MATERIAL TECH DEV
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