CN-121993266-A - Gas turbine and sealing tile buoyancy modification method

CN121993266ACN 121993266 ACN121993266 ACN 121993266ACN-121993266-A

Abstract

The invention provides a gas turbine and a buoyancy modification method of a sealing tile. The gas turbine comprises a rotor, a static part and a sealing tile, wherein the rotor can rotate around the central axis of the rotor, the static part is annularly arranged on the periphery of the rotor, a sealing cavity is defined by the static part and the rotor, the sealing cavity is annular, the axial direction of the sealing tile is in a first direction, the sealing tile is annularly arranged on the periphery of the rotor, the sealing tile is positioned in the sealing cavity, a sealing gap for containing an oil film can be formed between the inner peripheral surface of the sealing tile and the outer peripheral surface of the rotor, a floating groove is formed in the inner peripheral surface of the sealing tile and is communicated with the sealing gap, the floating groove penetrates through the end surfaces of the sealing tile on two sides of the sealing tile in the first direction, and an included angle is formed between the extending direction of the floating groove and the first direction. The gas turbine has the advantages of strong sealing reliability, long service life, small running vibration and noise and strong adaptability to working condition fluctuation.

Inventors

JIANG DONGJUN
SHU GUOGANG
XU JIANHAO
HU JUNHENG
ZHENG LEI
WEI XUEFEI
CHEN WEIHUA

Assignees

中国联合重型燃气轮机技术有限公司

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (10)

1. A gas turbine, comprising: a rotor rotatable about a central axis thereof; the static component is annularly arranged on the periphery side of the rotor, and the static component and the rotor define a sealing cavity which is annular; The sealing bush is annular, the axial direction of sealing bush is the first direction, the sealing bush is encircled to be established the periphery side of rotor, the sealing bush is located seal intracavity, the inner peripheral face of sealing bush with the outer peripheral face of rotor can form the sealed clearance that holds the oil film, wherein, the floating groove has been seted up on the inner peripheral face of sealing bush, the floating groove with sealed clearance intercommunication, the floating groove runs through the sealing bush is in the terminal surface of the both sides in the first direction, the extending direction of floating groove with the first direction is the contained angle.
2. The gas turbine of claim 1, wherein the plurality of floating grooves are provided on the inner peripheral surface of the seal shoe at intervals in the circumferential direction.
3. The gas turbine according to claim 2, wherein a central axis of the floating groove in the extending direction is a straight line or a curved line.
4. The gas turbine of claim 2, wherein an angle between an extending direction of the floating groove and the first direction is 69 ° or more and 83 ° or less.
5. A gas turbine according to claim 4, wherein, An included angle between the extending direction of the floating groove and the first direction is more than or equal to 69.1 degrees and less than or equal to 82.7 degrees; The depth of the floating groove is more than or equal to 0.4 mm and less than or equal to 0.8 mm.
6. A gas turbine according to claim 5, wherein, An included angle between the extending direction of the floating groove and the first direction is 75.7 degrees; the depth of the floating groove is 0.7 mm.
7. The gas turbine of claim 2, wherein the eccentricity of the seal shoe and the rotor is 0.3 or more and 0.7 or less.
8. A gas turbine according to claim 7, wherein, The eccentricity of the sealing shoe and the rotor is 0.5, and/or The thickness of the oil film between the inner peripheral surface of the seal shoe and the outer peripheral surface of the rotor is 0.1 mm.
9. A gas turbine according to any one of the claims 2-8, wherein, The number of the floating grooves is more than or equal to 18 and less than or equal to 24; The sealing tile is provided with an oil hole, an oil inlet of the oil hole is formed in one end face of the sealing tile in the first direction, and an oil outlet of the oil hole is formed in the inner peripheral face of the sealing tile.
10. A buoyancy modification method for a sealing tile is characterized by comprising the following steps of circumferentially arranging a plurality of floating grooves on the inner peripheral surface of the sealing tile to be modified, wherein the floating grooves penetrate through the axial end surface of the sealing tile, the extending direction of the floating grooves and the extending direction of the central axis of the sealing tile form an included angle, and the depth of the floating grooves and the included angle between the floating grooves and the axial direction of the sealing tile can be selected according to the calculated results of the influence of the included angles between the depth of the floating grooves and the extending direction of the central axis of the sealing tile on the floating lift force of the sealing tile.

Description

Gas turbine and sealing tile buoyancy modification method Technical Field The invention relates to the technical field of gas turbine sealing, in particular to a gas turbine and a buoyancy modification method of a sealing tile. Background The floating sealing tile is a key component in a gas turbine generator and is mainly applied in a floating ring sealing mode, and the core function of the floating sealing tile is to effectively control gas leakage, so that the efficiency, the reliability and the safety of equipment are improved. Its design aims at coping with high temperature, high pressure, high speed rotation and complex fluid environment inside the gas turbine. The floating seal shoes achieve non-contact or quasi-contact operation by creating a precisely controlled, small gap between the rotating (rotor) and stationary components and "floating" the seal ring by the hydrodynamic effect (formation of a gas or liquid film) within the gap, which greatly reduces frictional wear and leakage. In the related art, the floating seal tiles are divided into a single-flow ring seal tile, a double-flow ring seal tile and a three-flow ring seal tile. Sealing oil enters from the oil supply groove, and then flows to two sides from the sealing gap to seal hydrogen in the generator, and meanwhile, the sealing oil is used for isolating outside air. The sealing oil forms a dynamic pressure effect between the sealing pad and the pad support, the sealing pad forms a good floating effect, and the friction force of the sealing pad is reduced. The uniflow ring sealing tile and the oil system are simple in structure and convenient to operate, but the hydrogen leakage can be caused by the error of the oil pressure system. The double-flow ring sealing tile oil system provides two paths of oil ways which are respectively accessed from the hydrogen side and the air side, and the action principle of the double-flow ring sealing tile oil system is the same as that of the single-flow ring sealing tile, but the leakage of hydrogen can be better prevented, and the stable operation of hydrogen pressure is ensured. However, the structure is relatively complex, the oil system is also relatively complex, and the channeling easily occurs, so that the purity of the hydrogen is reduced. A vacuum oil way is added to the three-flow ring sealing tile to isolate air and hydrogen, but the vacuum oil cannot form a sealing effect, and the three-flow ring sealing tile has a complex structure and high manufacturing requirement. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, embodiments of the present invention provide a gas turbine and seal shoe buoyancy modification method. The gas turbine of the embodiment of the invention comprises: a rotor rotatable about a central axis thereof; the static component is annularly arranged on the periphery side of the rotor, and the static component and the rotor define a sealing cavity which is annular; The sealing bush is annular, the axial direction of sealing bush is the first direction, the sealing bush is encircled to be established the periphery side of rotor, the sealing bush is located seal intracavity, the inner peripheral face of sealing bush with the outer peripheral face of rotor can form the sealed clearance that holds the oil film, wherein, the floating groove has been seted up on the inner peripheral face of sealing bush, the floating groove with sealed clearance intercommunication, the floating groove runs through the sealing bush is in the terminal surface of the both sides in the first direction, the extending direction of floating groove with the first direction is the contained angle. In some embodiments, the plurality of floating grooves are arranged on the inner peripheral surface of the sealing tile at intervals along the circumferential direction. In some embodiments, the central axis of the extending direction of the floating groove is a straight line or a curved line. In some embodiments, the extending direction of the floating groove forms an angle of 69 ° or more and 83 ° or less with the first direction. In some embodiments, an angle between the extending direction of the floating groove and the first direction is greater than or equal to 69.1 ° and less than or equal to 82.7 °; The depth of the floating groove is more than or equal to 0.4 mm and less than or equal to 0.8 mm. In some embodiments, the floating groove extends at an angle of 75.7 ° to the first direction; the depth of the floating groove is 0.7 mm. In some embodiments, the eccentricity of the seal shoe and the rotor is greater than or equal to 0.3 and less than or equal to 0.7. In some embodiments, the eccentricity of the seal shoe and the rotor is 0.5, and/or The thickness of the oil film between the inner peripheral surface of the seal shoe and the outer peripheral surface of the rotor is 0.1 mm. In some embodiments, the nu