DE3337989C2 - Labyrinth seal - Google Patents

Abstract

Improved labyrinth seal to reduce the destabilizing effects caused by uneven pressure distribution in the circumferential sealing cavities and in which each cavity is divided into circumferential sections by a series of radially restricting walls. These portions of each cavity are all connected by radial channels to a manifold on the outer periphery.

Description

The invention relates to a labyrinth seal according to 20 results in symmetrical pressure distribution over the circumference, the preamble of claim 1. To have a symmetrical pressure distribution among all

From US-PS 28 86351 a labyrinth seal is to ensure circumstances, the individual chambers of this type are known, whereby to simplify the manufacturers 4 via radial channels 6 (i = 1 ... n) with a position and the assembly of the Labyrinth seal single-common ring line 7, (i = 1 ... n) connected, such as ne, ring elements L-shaped in cross section provided 25 this FIG. 3 shows

on the leg that is attached to the bore

wall, distributed over the circumference by means of 2 sheets of drawings

men of the leg have formed projections which in a view of the ring in the axial direction approximately Are designed U-shaped. This shape is used to form resiliently elastic sections by means of which the ring elements are held in the bore by resting on the bore wall. This radial inwardly protruding projections have a greater distance from the sealing edge on the other Legs of the ring elements, so that the usual in a labyrinth seal, successive in the axial direction Annular spaces between the individual ring elements result.

The rotation of a shaft to be sealed leads to the fact that this occurs in the individual annular spaces of the labyrinth seal penetrating fluid is entrained in these annular spaces in the circumferential direction. Occurs an eccentricity between the seal and the shaft, the fluid flow running in the circumferential direction leads into the individual annular spaces result in an uneven pressure distribution over the circumference, which causes the eccentricity the shaft is amplified and the shaft may vibrate.

The invention is based on the object of designing a labyrinth seal of the type specified at the outset in such a way that that in the individual annular spaces of the seal as uniform a pressure distribution as possible over the Scope is formed.

This object is achieved by the features in the characterizing part of claim 1. Because in everyone Annular space in the circumferential direction successive chambers are provided, a fluid flow in Circumferential direction does not occur in the individual annular spaces of the labyrinth seal. This creates an uneven Pressure distribution over the circumference with a slight eccentricity of the shaft avoided that too self-exciting vibration.

In the advantageous embodiment according to claim 2, the connection of the individual chambers forced even pressure distribution over the circumference.

An example embodiment of the invention

Claims (2)

1 is explained in more detail below with reference to the drawing: tert It shows F i g. 1 a longitudinal section through a labyrinth seal 1. Labyrinth seal with a number of in um- webs extending in the catch direction, which in axial direction s Fig. 2 shows a cross section along the line AA in limit successive annular spaces, Fig. I and and with front Fg. 3 distributed over the periphery, a cross section along the line B-β in FIG Cracks that appear radially inwards in each annular space Fig. protrude, characterized in that Fig. J shows a labyrinth seal 2, as it is in particular the projections (5) in each annular space in circumferential io special is used for gas turbine systems. on Form successive chambers (4) direction. of a shaft 1 are several one on top of the other in the axial direction 2. Labyrinth seal according to claim 1, thereby providing the following ribs. The labyrinth seal is characterized by the fact that the individual chambers (4) form several consecutive nes ringiaumes in the axial direction via radial channels (6) with an annular space 3, · (ϊ = 1 ... njt the ring line (7) shared by radial projections 15 5, (ϊ = \ ... n) 'm successive along the circumference Chambers 4, · (i = 1 ... n) are subdivided, as in Fig. 2 shows By the radially voi standing projections 5 is prevents the fluid from flowing in the circumferential direction, whereby in practice an essentially