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Method and Vibration Damping Device for Adjusting Gas Seal Gap of Steam Turbine with Air Jet Vibration Damping

A steam turbine and steam turbine blade technology, applied in mechanical equipment, engine components, machines/engines, etc., to reduce steam leakage, reduce radial runout, and maintain stability

Inactive Publication Date: 2019-03-08
HUADIAN ENERGY COMPANY LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0033] The purpose of the present invention is to solve the problem that in the prior art, when reducing the air leakage loss at the top air seal of the steam turbine blade, it only adopts a passive response to the radial runout of the rotor, which will bring other unfavorable factors while achieving a certain effect

Method used

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  • Method and Vibration Damping Device for Adjusting Gas Seal Gap of Steam Turbine with Air Jet Vibration Damping
  • Method and Vibration Damping Device for Adjusting Gas Seal Gap of Steam Turbine with Air Jet Vibration Damping
  • Method and Vibration Damping Device for Adjusting Gas Seal Gap of Steam Turbine with Air Jet Vibration Damping

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specific Embodiment approach 1

[0041] Specific implementation mode one: the following combination Figure 6 to Figure 9 This embodiment will be specifically described. The method for adjusting the gas seal gap of the steam turbine by the air injection damping is realized through the following steps:

[0042] Step 1: start the steam turbine; before starting, the gap t between the surface of the inner hole of the air seal assembly at the top of the moving blade of the steam turbine and the outer surface of the blade of the steam turbine is between 1.5 and 10 mm;

[0043] Step 2. After the steam turbine reaches the normal speed, adjust the centralizer assembly installed at the inner hole of the diaphragm, so that the upper bearing bush 9-1 and the lower bearing bush 9-2 on the centralizer assembly tend to close gradually and surround the main shaft 9-3 of the steam turbine , to reduce the radial runout of the steam turbine main shaft 9-3; in the initial state, the distance between the inner surface of the upp...

specific Embodiment approach 2

[0048] Specific implementation mode two: the following combination Figure 6 and Figure 8 This embodiment will be specifically described. This embodiment is compared with Embodiment 1: this method also includes two groups of distance sensors 6-14 and a group of vibration sensors 8-1, and the first group of distance sensors 6-14 is arranged on the air seal body 6-11 to Real-time measurement of the gap between the gas seal body 6-11 and the outer surface of the steam turbine blade 6-12 and the radial runout of the outer surface of the steam turbine blade 6-12; the second group of distance sensors 6-14 are arranged on the upper bearing bush 9-1 and the lower On the bearing bush 9-2, to measure the gap between the upper bearing bush 9-1 and the lower bearing bush 9-2 and the steam turbine main shaft 9-3 and the radial runout of the steam turbine main shaft 9-3 in real time; a set of vibration sensors 8-1 is arranged on the upper bearing bush 9-1 and the back side of the lower b...

specific Embodiment approach 3

[0051] Specific implementation mode three: the following combination Figure 8 This embodiment will be specifically described. The third step also includes the following technical means, in the process of making the surface of the inner hole of the air seal assembly at the top of the moving blade close to the outer surface of the steam turbine blade 6-12, the gap between the air seal body and the outer surface of the steam turbine blade 6-12 is collected in real time 1. The radial runout of the outer surface of the steam turbine blade 6-12 and the vibration data collected by the vibration sensor 8-1 to ensure that the value of the gap is always greater than the value of the radial runout. If the vibration data increases abnormally, it will immediately reverse the action to increase The distance between the surface of the inner hole of the air seal assembly at the top of the large moving blade and the outer surface of the steam turbine blade 6-12, when the vibration data return...

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Abstract

The invention provides a method for adjusting a steam turbine gas seal clearance by air injecting vibration damping and a vibration damping device, and relates to the method for adjusting a steam turbine rotor blade tip gas seal clearance by air injecting vibration damping and the vibration damping device. The problem that in the prior art, when the leakage loss of the steam turbine rotor blade tip gas seal clearance is reduced, radial run-out of a rotor is merely corresponded passively, and other unfavorable factors are brought is solved. According to the method and the device, after the steam turbine reaches a normal rotating speed, a centralizer assembly arranged at the position of an inner bore of a partition plate is adjusted, and an upper bearing bush and a lower bearing bush on the centralizer assembly gradually converge and surround a steam turbine main shaft, so that radial run-out of the steam turbine main shaft is reduced; and micropores are formed uniformly in the surface of the upper bearing bush and the lower bearing bush, and air inlets of the micropores communicate with a high pressure air chamber to form an air cushion. Finally, a steam turbine rotor blade tip gas seal assembly is adjusted, the surface of the inner bore of the rotor blade tip gas seal assembly is converged to the outer surface of steam turbine blades, and the clearance formed between the surface of the inner bore of the tip leakage gas seal assembly and the outer surface of the steam turbine blades is of 0.15 mm-0.45 mm.

Description

technical field [0001] The invention relates to a method and a vibration damping device for adjusting the air seal gap at the top of a steam turbine rotor blade for air jet vibration damping. Background technique [0002] A steam turbine is a power machine that converts the thermal energy of steam into mechanical energy. The stage is its most basic working unit. Structurally, each stage is composed of a nozzle and a moving blade cascade. After the steam enters the nozzle, its thermal energy is converted into Kinetic energy then enters the rotor blades, giving impact to the rotor blades, causing the impeller to rotate and output mechanical work. [0003] A large steam turbine is composed of multiple stages, and each stage is composed of dynamic and static parts, so the whole steam turbine is also composed of dynamic and static parts. There must be a certain gap between the rotating and stationary parts of the steam turbine to prevent mutual friction. Since there is a pressu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D11/20
CPCF01D11/20
Inventor 常立宏奚守谱邵松林
Owner HUADIAN ENERGY COMPANY LIMITED
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