Expansion sliding key system of steam turbine and steam turbine

Abstract

The invention provides an expansion sliding key system of a steam turbine and the steam turbine. The expansion sliding key system of the steam turbine comprises a first bearing seat, a high-pressure cylinder, a second bearing seat, an intermediate-pressure cylinder, a third bearing seat, a first low-pressure cylinder and a fourth bearing seat which are sequentially arranged from a control valve end to a motor end, wherein the first bearing seat and the second bearing seat can slide along a basic bedplate, and the third bearing seat and the fourth bearing seat are fixedly arranged on the basic bedplate. By means of the expansion sliding key system of the steam turbine, the axial expansion directions of a stator component and a rotor component can be consistent, the dynamic and static clearance is small, and the unit efficiency is high; and the absolute total expansion amount of a steam turbine rotor can be small, and the efficiency, safety and reliability of a steam turbine generator set under the partial load working condition can be better improved.

Description

technical field [0001] The invention relates to the technical field of steam turbines in power stations, in particular to a steam turbine expansion sliding pin system and a steam turbine. Background technique [0002] Because metal has the property of thermal expansion and cold contraction, the cylinder and rotor of the steam turbine will expand or contract after contacting the steam. The steam turbine is a high-speed rotating machine, and there must be sufficient clearance between the dynamic and static parts to prevent dynamic and static rubbing failures. When the steam turbine unit starts and stops or the unit load changes greatly, its cylinder and rotor will expand and contract with the change of steam temperature. In order to ensure that the center of the rotor and the center of the cylinder are consistent when the steam turbine is running, the expansion of the stator part and the rotor part of the steam turbine is called the expansion sliding pin system of the steam t...

AI Technical Summary

Problems solved by technology

If the sliding pin system does not work properly, it will cause poor thermal expansion of the cylinder, which will not only easily cause dynamic and static friction, but in serious cases will cause the unit to fail to operate

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