Labyrinth seal

A labyrinth sealing and sealing element technology, applied in the direction of engine sealing, engine components, machines/engines, etc., can solve problems such as large leakage loss

Active Publication Date: 2014-05-28
ANSALDO ENERGIA IP UK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the sealing effectiveness of the labyrinth seal in the resulting shifted position can be negatively affected, leakage losses become greater and the steady state power and efficiency of the machine can be negatively affected

Method used

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Examples

Experimental program
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Embodiment Construction

[0038] figure 2 with figure 1 A similar view shows a first exemplary embodiment of a labyrinth seal according to the invention. with according to figure 1 Different from the seals, the sealing strip 13 on the stator side is arranged asymmetrically in each case, at figure 1 In each case, the stator-side sealing strip 13 is arranged symmetrically centrally between the two rotor-side sealing strips. The distance b from the sealing strip 13' on the stator side to the next adjacent sealing strip 14b on the right rotor side is the distance from the sealing strip 13' on the stator side to the next adjacent sealing strip 14a on the left rotor side Part of a (the ratio of b to a is less than 1). figure 2 The cold-installed state of the labyrinth seal 25 is shown. Also shown is the transient movement 28 of the sealing tip of the stator-side sealing strip 13 relative to the rotating part 12 . The overall motion from the cold state to the steady state is shown. The resulting tran...

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PUM

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Abstract

A labyrinth seal (25,...,27), for sealing the annular interspace (11) between the rotor (12) and the stator (10) of a steam turbine or gas turbine, comprises a multiplicity of sealing strips (13) which are arranged in series in the axial direction, are fastened on the stator (10) and project into the interspace (11), which sealing strips interact, with sealing effect, with rotor-side sealing elements (14, 19) which are arranged in a staggered manner. With such a labyrinth seal (25,...,27), an improved sealing effect is achieved by the sealing strips (13) in the cold installed state being offset in relation to a symmetrical position, wherein the offset has the reverse direction and the same amount as the distance (29) by which the sealing strip (13) is displaced relative to adjacent rotor-side sealing elements (14, 19) as a result of thermal expansions of the stationary and rotating components and support structure when being heated from the cold installed state to a hot steady-state operating condition.

Description

technical field [0001] The invention relates to the field of rotary thermodynamic machines. It relates to a labyrinth seal for sealing an annular gap between a stationary part and a rotating part of a rotating thermodynamic machine, in particular a steam or gas turbine. Background technique [0002] exist figure 1 A typical known interengaging labyrinth seal system is reproduced in detail in a very simplified form in . The labyrinth seal 24 shown here seals the annular gap 11 between the (inner) rotating part 12 and the stationary part 10 which surrounds it concentrically against a gas flow. The interengaging labyrinth seal 24 comprises both stator-side sealing strips 13 fastened on the stationary part 10 and rotor-side sealing strips 14 fastened on the rotating part 12, which are arranged in a staggered manner and In each case it engages radially in the gap of the opposite sealing strip. [0003] However, according to figure 1 The interengaging labyrinth seals present ...

Claims

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Application Information

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IPC IPC(8): F16J15/447F01D11/02
CPCF05D2300/50212F16J15/445F01D11/025F01D11/02F16J15/4472
Inventor C.布里考德U.R.斯泰格A.海德克C.斯蒙-德加多
Owner ANSALDO ENERGIA IP UK LTD
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