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Sealing method for steam-turbine shaft seal and cylinder surface of low-pressure external cylinder

A steam turbine and shaft seal technology, which is applied in the field of steam turbine sealing, can solve problems such as steam leakage traces, steam leakage, and steam leakage traces on the cylinder surface, and achieve the effect of saving repair funds

Inactive Publication Date: 2019-01-18
DATANG HUAIBEI POWER PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a steam turbine shaft seal and a sealing method at the surface of the low-pressure outer cylinder thereof, so as to solve the problem that most of the medium-pressure steam turbines, high-pressure steam turbines, subcritical steam turbines, and supercritical steam turbines have high and medium pressure problems in the above background technology. Steam leakage at the front and rear shaft seals of the low-pressure cylinder, steam leakage traces on the cylinder surface of the low-pressure outer cylinder, and steam leakage traces on the joint surface of the low-pressure cylinder and exhaust cylinder

Method used

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  • Sealing method for steam-turbine shaft seal and cylinder surface of low-pressure external cylinder
  • Sealing method for steam-turbine shaft seal and cylinder surface of low-pressure external cylinder
  • Sealing method for steam-turbine shaft seal and cylinder surface of low-pressure external cylinder

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Embodiment 1

[0028] see Figure 1-3 , the present invention provides a steam turbine shaft seal, comprising a body 4, a crankshaft 6 is arranged inside the body 4, an air port is opened on the outer wall of the crankshaft 6, a shaft seal sleeve 8 is provided at the position of the air port of the crankshaft 6, and the shaft seal sleeves 8 are provided together There are several, several 8 are evenly distributed in pairs on the outer wall of the crankshaft 6, the inside of the body 4 is provided with an air intake chamber 1, and the air intake chamber 1 communicates with the crankshaft 6, and the inside of the body 4 is provided with an air extraction chamber 5. The air chamber 5 communicates with the crankshaft 6, and the air extraction chamber 5 is located below the air intake chamber 1, two air intake chambers 1 and two air extraction chambers 5 are opened, and the two air intake chambers 1 and the two air extraction chambers 5 are distributed correspondingly On both sides of the cranksh...

Embodiment 2

[0035] see Figure 1-3 , the present invention provides a steam turbine shaft seal, comprising a body 4, a crankshaft 6 is arranged inside the body 4, an air port is opened on the outer wall of the crankshaft 6, a shaft seal sleeve 8 is provided at the position of the air port of the crankshaft 6, and the shaft seal sleeves 8 are provided together There are several, several 8 are evenly distributed in pairs on the outer wall of the crankshaft 6, the inside of the body 4 is provided with an air intake chamber 1, and the air intake chamber 1 communicates with the crankshaft 6, and the inside of the body 4 is provided with an air extraction chamber 5. The air chamber 5 communicates with the crankshaft 6, and the air extraction chamber 5 is located below the air intake chamber 1, two air intake chambers 1 and two air extraction chambers 5 are opened, and the two air intake chambers 1 and the two air extraction chambers 5 are distributed correspondingly On both sides of the cranksh...

Embodiment 3

[0042] see Figure 1-3 , the present invention provides a steam turbine shaft seal, comprising a body 4, a crankshaft 6 is arranged inside the body 4, an air port is opened on the outer wall of the crankshaft 6, a shaft seal sleeve 8 is provided at the position of the air port of the crankshaft 6, and the shaft seal sleeves 8 are provided together There are several, several 8 are evenly distributed in pairs on the outer wall of the crankshaft 6, the inside of the body 4 is provided with an air intake chamber 1, and the air intake chamber 1 communicates with the crankshaft 6, and the inside of the body 4 is provided with an air extraction chamber 5. The air chamber 5 communicates with the crankshaft 6, and the air extraction chamber 5 is located below the air intake chamber 1, two air intake chambers 1 and two air extraction chambers 5 are opened, and the two air intake chambers 1 and the two air extraction chambers 5 are distributed correspondingly On both sides of the cranksh...

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Abstract

The invention discloses a sealing method for a steam-turbine shaft seal and a cylinder surface of a low-pressure external cylinder. The method is used for sealing the cylinder surface of the low-pressure cylinder, and the problem that people need to replace shaft seals for eliminate shaft-seal leakage in the past is solved. The method is used for sealing the cylinder surface of the low-pressure cylinder, the method can be performed on most machine units, the cylinder repair cost can be saved, and a long overhaul period and a large amount of labor cost caused by repair can be avoided. The method is used for processing junction surfaces of high, middle and low pressure shaft seals, the junction surfaces of low-pressure cylinder shaft seals, and the junction surfaces of the low-pressure cylinder and joints of an exhaust cylinder, the original shaft seals need to be adjusted according to the standard during an overhaul, and as for the remaining work, sealing can be fully completed after the junction surfaces of the shaft seals and cylinder leakage parts are coated with novel sealing materials during the overhaul of buckle cylinders.

Description

technical field [0001] The invention belongs to the technical field of steam turbine sealing, and in particular relates to a steam turbine shaft seal and a sealing method at the surface of a low-pressure outer cylinder thereof. Background technique [0002] Cylinder sealing grease is applied to the joint surface of the horizontal split surface of the shaft seal sleeve and the middle split surface of the low-pressure cylinder, so that there is a certain sealing coating on the joint surface of the shaft seal sleeve and has a certain thickness. [0003] At present, most of the medium-pressure steam turbines, high-pressure steam turbines, subcritical steam turbines, and supercritical steam turbines produced in my country have steam leakage at the front and rear shaft seals of high, medium and low pressure cylinders. There are traces of steam leakage on the joint surface of the cylinder and the exhaust cylinder. Contents of the invention [0004] The purpose of the present inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D11/00C23C4/123B05D1/02B05D3/04
CPCB05D1/02B05D3/0406C23C4/123F01D11/00
Inventor 沈振杨永王海军任贻文陈怿江彬
Owner DATANG HUAIBEI POWER PLANT