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Method and device for adjusting steam turbine gas seal with jet auxiliary center support for damping vibration

A technology for auxiliary centers and steam turbines, applied to mechanical equipment, engine components, machines/engines, etc., to achieve the effects of reducing steam leakage, maintaining stability, and reducing radial runout

Inactive Publication Date: 2018-04-13
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 device for adjusting steam turbine gas seal with jet auxiliary center support for damping vibration
  • Method and device for adjusting steam turbine gas seal with jet auxiliary center support for damping vibration
  • Method and device for adjusting steam turbine gas seal with jet auxiliary center support for damping vibration

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specific Embodiment approach 1

[0045] Specific implementation mode one: the following combination Figure 6 to Figure 12 This embodiment will be specifically described. This implementation mode is realized through the following steps:

[0046] 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 turbine blade is between 1.5 and 10 mm;

[0047] 2. After the steam turbine reaches the normal speed, adjust the auxiliary support assembly arranged at the inner hole of the partition, so that the auxiliary upper bearing bush and the auxiliary lower bearing bush on the auxiliary support assembly gradually tend to close up and surround the main shaft of the steam turbine, so as to reduce the diameter of the main shaft of the steam turbine. In the initial state, the distance between the inner surface of the auxiliary upper bearing bush 7-1 and the auxiliary lower bearing bu...

specific Embodiment approach 2

[0057] Specific implementation mode two: the following combination Image 6 , 8 and Figure 9This embodiment will be specifically described. This embodiment is compared with Embodiment 1: this method also includes three groups of distance sensors 6-14 and a group of vibration sensors 8-1, and the group of distance sensors 6-14 is arranged on the air seal body 6-11 for real-time Measure 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 other group of distance sensors 6-14 is arranged on the main upper bearing bush 9-1 and the main On the lower bearing bush 9-2, to measure the gap between the main upper bearing bush 9-1 and the main 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; the other set of distance sensors 6 -14 is set on the auxiliary upper bearing shell 7-1 and th...

specific Embodiment approach 3

[0061] Specific implementation mode three: the following combination Image 6 This embodiment will be specifically described. The fifth step also includes the following technical means. During 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 outer surface of the air seal body 6-11 and the steam turbine blade 6-12 are collected in real time. The surface gap, 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 are used to ensure that the value of the gap is always greater than the value of the radial runout. Increase the distance between the surface of the inner hole of the air seal assembly at the top of the moving blade and the outer surface of the turbine blade 6-12, and resume operation when the vibration data returns to the value before the abnormal increase. The abnormal ...

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Abstract

The invention discloses a jet-assisted center support vibration reduction regulating method and device for gas seals of a steam turbine, relates to a method and device for regulating a gap between gas seals at the top of a moving blade of a steam turbine and solves the problem that other adverse factors can be brought because the radial run-out of a rotor is only passively handled when the gas leakage loss at a gas seal of the top of the moving blade of the steam turbine is reduced at present. The scheme of the method and the device lies in that after the normal rotating speed of the steam turbine is reached, an auxiliary upper bearing bush and an auxiliary lower bearing bush gradually tend to be closed and surround a main shaft of the steam turbine to reduce the radial run-out of the main shaft of the steam turbine; next, a main upper bearing bush and a main lower bearing bush gradually tend to be closed and surround the main shaft of the steam turbine; then, the auxiliary upper bearing bush and the auxiliary lower bearing bush are made to gradually return to leave from the outer surface of the main shaft of the steam turbine; and finally, the inner hole surface of a gas seal assembly at the top of the moving blade is made to be gradually close to the outer surface of a blade of the steam turbine, and finally, the gap between the moving blade and the blade ranges from 0.15 mm to 0.45 mm. The main shaft of the steam turbine is firstly constrained by a gas jet bearing bush, so that the regulating process is more stable.

Description

technical field [0001] The invention relates to a method and a device for adjusting the air seal gap at the top of a steam turbine blade. 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 pressure difference between the inside and outside of the cy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D11/14
CPCF01D11/14
Inventor 常立宏王相军宫志阳
Owner HUADIAN ENERGY COMPANY LIMITED
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