Sealing assembly for gas turbine and gas turbine

Abstract

The invention discloses a sealing assembly for a gas turbine and the gas turbine. The sealing assembly comprises a sealing ring, the sealing ring comprises a first section and a second section which are sequentially connected along the axial direction of the sealing ring, the cross sectional area of the inner circumferential profile of the first section is larger than the cross sectional area of the inner circumferential profile of the second section, the length of the first section along the axial direction of the sealing ring is smaller than the length of the second section along the axial direction of the sealing ring, at least one of the inner peripheral surface of the first section and the inner peripheral surface of the second section is provided with a fingertip sealing component, and the fingertip sealing component and a rotating body are spaced along the radial direction of the sealing ring. The sealing assembly for the gas turbine is not likely to wear and long in service life, and the sealing effect is improved.

Description

technical field [0001] The invention relates to the technical field of gas turbines, in particular to a sealing assembly for a gas turbine and the gas turbine. Background technique [0002] In gas turbines, the interstages of the turbine discs are usually sealed to prevent the gas in the main channel from intruding into the turbine chamber and ensure the normal and efficient movement of the gas turbine. In the external suction from a certain stage of the compressor, most of the airflow enters the interior of the stator blade, and part of the airflow entering the interior of the stator blade cools the turbine stator blade, and the other part flows to the stator blade sealing ring and is divided into two parts along the axial direction. The two parts of the air flow flowing forward and backward respectively pass through the sealing parts on the sealing ring of the vane, and then seal the gas leaked from the main channel. [0003] In the related art, the sealing components on ...

AI Technical Summary

Problems solved by technology

However, there is a gap between the sealing teeth of the labyrinth seal and the surface of the rotating shaft, and the leakage is large, and under the influence of the radial movement of the rotating shaft surface, the sealing teeth are easy to wear, resulting in increased leakage or even seal failure; the brush seal is relatively For the labyrinth seal, although the leakage is small, the brush wire is in contact with the surface of the shaft, and the brush wire is easy to wear during the operation of the shaft, resulting in a larger seal gap and larger leakage. bad

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