A Measuring Tool for Throughflow of Steam Turbine

Abstract

The invention discloses a turbine flow measurement tool which comprises a pull piece, a measurement head and a power supply and digital display module, wherein the measurement head comprises a body, an induction head which is arranged at the end part of the body and is used for measuring a distance between the measurement head and a rotor based on a laser ranging principle, and a lever assembly; the induction head is connected with the power supply and digital display module through a transmission cable; the ends, away from the induction head, of the pull piece and the body are detachably connected to pull the whole measurement head to move in a to-be-measured steam seal channel; the lever assembly is supported on two sides of the body in a rotatable manner to enable the distance between the measurement head and the bottom of the steam seal channel to be unchanged in the process that the measurement head moves in the steam seal channel. The turbine flow measurement tool can directly measure turbine flow without lifting the rotor, and is easy to operate; measured data can be visually displayed through the power supply and digital display module; furthermore, by the arrangement of an adjustment pad, the turbine flow measurement tool can be applied to turbines with different sizes.

Description

technical field [0001] The invention relates to the field of nuclear power plant steam turbines, in particular to a steam turbine flow measurement tool. Background technique [0002] During the installation and maintenance of the steam turbine in the power plant, precise measurements must be taken on the steam seal, diaphragm and flow-through parts to ensure that the center of the stationary blade on the diaphragm of the steam turbine can be aligned with the center of the moving blade on the positive rotor, and that the diaphragm seal can be obtained. uniform gap. In order to improve the efficiency of the unit and ensure its safe operation, the flow gap must be measured and adjusted during the overhaul of the power plant, which is a precise and heavy work. [0003] At present, in nuclear power plants, the commonly used methods of measuring through-flow include false shaft method, lead wire, manual measurement with feeler gauge and so on. False shaft method, the false shaft...

AI Technical Summary

Problems solved by technology

False shaft method, the false shaft is generally made of thick-walled pipes, and the pipes with larger diameters are installed at both ends, and the diameter is the same as that of the journal, so as to be supported on the bearing bush. The false shaft can also be supported on a special On the dummy bearing, but the measurement data will be affected by the wear or displacement of the bearing bush. The manufacturing process of the dummy bearing is complicated, and the dummy shaft also has a static winding degree, which leads to inaccurate flow data measured by the dummy shaft method.

The manual measurement method of lead wire and feeler gauge needs to lift the rotor repeatedly, and the operation risk is high. The change of the thickness of the lead wire after compression needs to be measured manually, and the amount of data processing is huge, which is laborious and laborious.

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