Leakage reducing structure of steam turbine

Abstract

A leakage-reducing structure for steam turbine is disclosed. The high-, middle-and low-pressure parts of turbin are arranged along rotor in a cover. The steam passes through the nozzle cavity integrated with sealing ring and them into high-pressure part to do work. In other hand, part of high-pressure steam trends toward possing through the sealing ring into middle-pressure part, but the leaked steam from external tube to high-pressure part is recovered and effectively used, to preventing the reduction of performance.

Description

technical field [0001] The present invention relates to a leakage reduction structure of a steam turbine, and in particular to such a leakage reduction structure of a steam turbine, which can avoid the following troubles: that is, in a single-shroud type steam turbine, high-pressure steam passes through the sealing part of the packing ring and leaks to Intermediate pressure turbine side, thereby reducing performance. Background technique [0002] Fig. 3 is a cross-sectional view showing the internal structure of a conventional single-shroud steam turbine. In FIG. 3, reference numeral 1 designates a rotor, 2 designates a housing covering the entire turbine, 3 designates a high-pressure turbine section in which stator blades mounted on the stator side and rotor blades fixed to the rotor 1 are arranged in multiple stages, 4 5 represents a medium-pressure turbine section in which the stator blades and rotor blades are arranged in the same multi-stage formation, and 5 represents...

AI Technical Summary

Problems solved by technology

Therefore, if the leakage is large, it has a negative impact on the performance, thus, it will reduce the performance of the high pressure turbine section 3

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