Vortex steam seal of steam turbine

Abstract

The invention discloses a vortex steam seal of a steam turbine. The vortex steam seal comprises a steam seal body, high teeth, high tooth oblique tips, low teeth, cavity inlets, labyrinth vortex cavities, flow guiding oblique teeth, turbulent flow small teeth, turbulent flow oblique small teeth and a steam end. The vortex steam seal is characterized in that vortex steam flow is formed by adoptingthe labyrinth vortex cavities; vortex flow channels are formed through the high teeth and the low teeth which are radially arranged in parallel, and therefore vortex steam flow and steam flow which axially enters the steam turbine generate 90-degree collision sealing; the high teeth with the high tooth oblique tips are adopted, therefore, the shaft clearance is further decreased, and meanwhile collision and wear damage of a shaft and the high teeth in the steam turbine starting process can be effectively prevented; the flow guiding oblique teeth incline 35 degrees to the steam flow in the reverse direction, and then the steam flow is fully guided into the labyrinth vortex cavities; and turbulent flow vortex steam flow is fully formed by adopting the turbulent flow small teeth and the turbulent flow oblique small teeth, and therefore the sealing efficiency is effectively improved. Therefore, wear and collision between the shaft and the high teeth are relieved, and the defects in the prior art are overcome.

Description

technical field [0001] The invention relates to the technical field of steam seals, in particular to a scroll steam seal of a steam turbine. Background technique [0002] A steam turbine is a large-scale, precision heat-power conversion power machine rotating at high speed. A certain axial and radial gap must be reserved between static bodies such as cylinders and baffles and rotating bodies such as main shafts and blades to prevent friction between moving and static parts of the unit during operation. In order to reduce the steam leakage in the seal gap, a seal device must be installed to keep the seal gap within the standard range and tend to the minimum value under the premise of ensuring no dynamic and static friction. Only in this way can we ensure that the steam leakage loss between each stage and each cylinder of the multi-stage steam turbine can be reduced, and the thermal efficiency of the unit can be improved. [0003] Among the various losses of steam turbine he...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a scroll seal for a steam turbine, which solves the problem that the existing steam seal technology easily causes direct friction and collision between the shaft of the steam turbine and the high teeth of the steam seal, and the sealing efficiency is low

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