System for sealing off gap

Abstract

In fluid machines frequently gaps between movable (1) and stationary (2) structural parts have be sealed off. Frequently so-called labyrinth packings are used, whereby sealing strips (5) brush against the opposite structural part. The aim of the invention is to provide an improved system. To this end, a brush layer (7) is configured as a porous coating that can be detached from the opposite structural part (1,2). The inventive system can be advantageously used in virtually any fluid machines.

Description

technical field [0001] The invention relates to a structure for a fluid flow machine, especially a steam turbine, for sealing a gap between a movable element and a stationary element, the structure carrying a grazing layer on the surface flanking the gap. Background technique [0002] In machines that manipulate and process flowing liquid and / or gaseous media, gaps between movable and stationary elements often need to be sealed against the flowing media. Such seals are particularly useful in turbines containing steam, where the gap between the rotor and the casing surrounding the rotor is sealed so that the passage of steam through the blade ring is blocked. The quality of these seals has a great influence on the efficiency of these machines, especially in the case of steam turbines. [0003] To achieve this, axially arranged sealing strips next to each other are used in the construction of the steam turbine, which are also referred to as labyrinth seals. These seals are c...

AI Technical Summary

Problems solved by technology

[0006] However, in the known labyrinth seals and in the construction according to US Pat. next to contact

On the other hand, apart from the occasional moment of contact between the elements, the result of the above-mentioned sealing is that there is a gap in which a part of the working medium flows through the turbine blades without being utilized, and this part of the working medium should not be ignored

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