Cylinders for steam turbines

Abstract

The invention provides a steam cylinder applied to a steam turbine. The steam cylinder comprises a rotor, blades and a cylinder body; the rotor is arranged inside the cylinder body in a penetrating manner; one end of the cylinder body and the rotor are sealed; a space for accommodating the blades is formed between the other end of the cylinder body and the rotor; the blades include stationary blades and movable blades, wherein the movable blades and the rotor are fixed; the movable blades and the stationary blades are arranged alternately; the cylinder body is of a circumferential type integral structure; a steam charging chamber for charging main steam is formed between the cylinder body and the rotor; the blades are arranged behind the steam charging chamber; the stationary blades are fixed to a holding ring; the holding ring is formed by splicing two half circumferential rings; and the holding ring tightly leans against the inner wall of the cylinder body. According to the steam cylinder applied to the steam turbine provided by the invention, the cylinder body adopts a circumferential type overall ring structure, so the steam cylinder can bear quite high pressure difference andtemperature.

Description

technical field [0001] The invention relates to the technical field of steam power equipment, in particular to a cylinder for a steam turbine. Background technique [0002] According to "Thermal Power Plant Equipment Manual - Volume II - Steam Turbine, Mechanical Industry Press, 1998". The inner cylinder of the traditional steam turbine cylinder (including 2-stage and above stationary blades) is not a full-circle type, but a upper and lower half structure (or left and right halves, or up, down, left, and right 4 halves, the same below). The purpose of the upper and lower halves of the inner cylinder is to accommodate the rotor and blades. The connection methods of the upper and lower half structures include bolt connection and thermal collar connection. The upper and lower half-cylinder structures are fastened by bolts or thermal collars. On the one hand, the bolts or thermal collars need to bear a lot of stress, and will creep and relax under high temperature and high pre...

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a cylinder for a steam turbine, which is used to solve the problem of the strength of the steam turbine cylinder under high steam parameters and the problem of poor start-stop performance in the prior art

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