A Method of Measuring the Radial Flow Gap of Steam Turbine by Laser Tracking Measurement System

Abstract

The invention discloses a method for measuring the radial flow path clearance of a steam turbine through a laser tracking measuring system. The method comprises the steps that S10, the radial relativeposition of a rotor and a steam cylinder in r the cold state of the steam cylinder is measured; S20, the laser tracking measuring system is adopted to measure a shaft seal and rotor hub surfaces corresponding to partition plates in a station transferring mode, and the diameters and rotor vertical arcs of the measured rotor hub surfaces are fitted; S30, the laser tracking measuring system is adopted to measure tooth tip coordinates of all stages of partition plate steam seal blocks and shaft seal steam seal blocks in the cylinder, and shaft seal bores on the outermost side of the steam end andthe exciter end in a station transferring mode, the shaft seal bores on the outermost side of the steam end and the exciter end are fitted, a cylinder body center line is created, and the distances from the tooth tips of all the stages of partition plate steam seal blocks and the shaft seal steam seal blocks to the cylinder body center line are fitted; and S40, the laser tracking measuring systemis adopted to fit the radial clearance of an actual partition plate steam seal and the shaft seal steam seal in the cylinder under the cold state according to the measured relative position of the rotor and the steam cylinder and based on data in the step S20 and the step S30. By applying the method for measuring the radial flow path clearance of the steam turbine through the laser tracking measuring system, the measuring precision is improved.

Description

technical field [0001] The invention relates to the field of steam turbines, in particular to a method for measuring the radial flow gap of a steam turbine by a laser tracking measurement system. Background technique [0002] As the country's demand for clean electricity continues to grow, the maintenance period is required to be shorter and shorter. As an important part of power plant equipment, steam turbines are increasingly being tested for their overhaul period. Among them, the measurement and adjustment of the cylinder flow clearance is the most important part of the steam turbine cylinder overhaul project. Its smooth implementation can not only Ensure the safe operation of the unit and improve the operating efficiency of the unit. However, this work takes a long period of time in the current steam turbine overhaul, and frequent lifting of large equipment brings huge risks to the job site. Therefore, on the premise of ensuring the quality of maintenance, how to short...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a laser tracking measurement system for measuring the radial flow gap of a steam turbine in view of the defects caused by gap measurement in the prior art by using lead wire or rubberized cloth and partition alignment. method

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