Forward/reverse rotation measuring method for large fan in thermal power unit

Abstract

The invention relates to a forward / reverse rotation measuring method for a large fan in a thermal power unit. Three reflective stripes are distributed and pasted at the relative positions of different radiating blades of a fan, and the interval angles of the three reflective stripes are respectively 45 degrees, 90 degrees, and 225 degrees. Then, an illuminating signal at a certain frequency is emitted to the radiating blades of the fan, and whether the fan rotates clockwise or counterclockwise is determined accurately according to feedback signals of the reflective stripes. The method for collecting the feedback signals of the reflective stripes comprises the steps of adopting a pair of infrared transmitter and infrared receiver, connecting the output of the infrared receiver to an oscilloscope, and displaying the feedback signals of the three reflective stripes through the oscilloscope. By pasting the reflective stripes at the different positions of the radiating blades of the fan, whether the fan rotates clockwise or counterclockwise can be determined accurately and visually according to the frequency interval of the feedback signals. Reverse rotation of large fan equipment in a thermal power plant can be discovered in time, and the occurrence of accidents is avoided.

Description

technical field [0001] The invention belongs to the technical field of power plant boilers, in particular to a method for measuring the forward and reverse directions of a large fan of a thermal power unit. Background technique [0002] During the start-up process of large-scale fans in thermal power plants, it is often encountered that the fan is reversed, which will affect the start-up of the fan. If it is not detected in time, it will easily cause the motor to burn out. However, due to the high speed of the fan motor, it cannot be detected in time only by visual inspection The motor reverses. Therefore, it is necessary to develop a method to accurately and intuitively determine the forward and reverse states of the fan. Contents of the invention [0003] The object of the present invention is to propose a method for measuring forward and reverse rotation of a large fan of a thermal power unit aiming at the deficiencies of the prior art. [0004] The present invention ...

AI Technical Summary

Problems solved by technology

[0002] During the start-up process of large-scale fans in thermal power plants, it is often encountered that the fan reverses, which affects the start-up of the fan. If it is not discovered in time, it is easy to cause the motor to burn out. However, due to the high speed of the fan motor, it cannot be detected in time only by visual inspection motor reverse

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