Sealing strip for passive gap adjusting friction starting steam turbine sealing

A technology for adjusting the gap and the steam seal, which is applied in the direction of engine components, machines/engines, mechanical equipment, etc. It can solve the problems of excessive steam seal gap, rotor journal damage, large steam quality and flow loss, etc. Good quality, good adjustment effect, and the effect of reducing the steam seal gap

Active Publication Date: 2015-04-01
HARBIN TURBINE +1
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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 friction-start steam turbine steam seal with a passively adjusted gap to solve the problem that the steam seal gap is too large during the startup and opera

Method used

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  • Sealing strip for passive gap adjusting friction starting steam turbine sealing
  • Sealing strip for passive gap adjusting friction starting steam turbine sealing
  • Sealing strip for passive gap adjusting friction starting steam turbine sealing

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0012] Specific implementation mode 1: Combination Figure 1 to Figure 3 It is explained that the steam sealing sheet of this embodiment is a circular ring sheet, and the steam sealing sheet is composed of a first ring sheet 01, a second ring sheet 02 and a transition ring sheet 03. The diameter of the first ring sheet 01 is larger than that of the second ring sheet. The diameter of sheet 02, the second ring sheet 02, the transition ring sheet 03, and the first ring sheet 01 are fixed in a vertical ring sleeve, the thickness of the first ring sheet 01 is greater than the thickness of the second ring sheet 02, and the inner ring thickness of the transition ring sheet 03 is the same as The thickness of the second ring piece 02 is the same, the thickness of the outer ring of the transition ring piece 03 is the same as the thickness of the first ring piece 01, the steam seal is a martensitic stainless steel steam seal, and one side of the steam seal is vertical Plane, the inner sid...

Example Embodiment

[0013] Specific implementation manner two: combination Figure 1 to Figure 3 Note that the annular surface of the small ring piece 02, the annular surface of the transition ring piece 03, and the annular surface of the large ring piece 01 corresponding to the other side annular surface of the steam sealing piece in this embodiment are all cold-rolled and formed toroidal surfaces.

[0014] The technical features not disclosed in this embodiment are the same as those in the first embodiment.

Example Embodiment

[0015] Specific implementation mode three: combination Figure 1 to Figure 3 Note that the chamfer 04 of the small ring sheet 02 in this embodiment is a 45° chamfer. The 45° chamfer is a common chamfer in machining, which is easy to manufacture.

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Abstract

The invention discloses a sealing strip for passive gap adjusting friction starting steam turbine sealing, relates to a sealing strip for friction starting steam turbine rotor journal sealing and blade tip lashing strip sealing, and aims to solve the problems that in the starting and running phase of a steam turbine, the quality and flow loss of steam is high as a sealing gap is large, and a blade tip lashing strip or a rotor journal is damaged by the sealing strip when the gap is manually and mistakenly set. A second annular piece and a transitional annular piece are fixedly connected with a first annular piece loop, the sealing strip is a martensitic stainless steel sealing strip, a chamfer is arranged at the inner side wall of the second annular piece corresponding to an annular face of the other side of the sealing strip, and the Vickers hardness of an annular face of the second annular piece, an annular face of the transitional annular piece and an annular face of the first annular piece corresponding to the annular face of the other side of the sealing strip ranges from 150HV to 175HV. The sealing strip is used for sealing high-temperature and high-pressure gas of the blade tip lashing strip or the rotor journal.

Description

technical field [0001] The invention relates to a steam seal plate used for the friction start steam turbine rotor shaft neck seal and blade top wrap seal. Background technique [0002] In order to prevent air leakage and reduce heat consumption, the steam turbine mainly realizes the high-temperature and high-pressure gas sealing of the shroud of the blade tip and the rotor journal through the steam seal plate. In the prior art, the steam seal structure of 300MW subcritical unit to 1000MW supercritical unit mostly adopts the traditional comb-tooth structure, in which the steam seal plates are arranged vertically, and several steam seal plates are arranged horizontally in sequence, as shown in figure 2 and image 3 As shown, in order to ensure the safe start of the steam turbine unit and reduce the risk of friction between the seal plate and the shroud or the rotor journal, there is a gap of 0.5mm to 0.75mm at the seal position. With the continuous improvement of the steam ...

Claims

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Application Information

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IPC IPC(8): F01D11/00
Inventor 王洪昌鞠凤呜赵义瀚彭建强刘新新杨鑫孙福民翟玉琛徐国林
Owner HARBIN TURBINE
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