Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between shaft or shaft sleeve and... – Seal
Patent
1998-11-06
2000-05-09
Look, Edward K.
Rotary kinetic fluid motors or pumps
Bearing, seal, or liner between shaft or shaft sleeve and...
Seal
4151733, 277355, F16J 15447
Patent
active
060595264
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a brush seal for sealing two spaces of differing pressure between a stator and a rotor of a turbomachine.
Brush seals for turbomachines are known and have proven themselves as sealing means relative to other seal construction embodiments such as lip seals or labyrinth seals for example. A disadvantage of conventional brush seals is that a certain minimum radial extension of the entire arrangement of the brush seal is required due to a necessary bristle length, when it is desired to maintain the stiffness of the bristles within acceptable limits. Bristles that are too short and thus too stiff would attack the seal surface against which the ends run.
Thus, the object of the present invention is to provide a brush seal that enables a low bristle stiffness on the one hand, and requires only the smallest possible radial structural space on the other hand.
The presented object is achieved according to the invention in that the bristles of the brush seal comprise angled bristle sections of which the ends run against the seal surface of the rotor.
The brush seal according to the invention achieves the presented object in that the stiffness of the bristles can be set by a corresponding selection of the bristle shaft ends extending in the axial direction. Thereby it is possible to maintain the radial structural space for such a brush seal to be so small that a brush seal can be used without problems and without substantial changes of the rotor or the stator in applications in which previously a labyrinth seal was constructively provided.
Preferably, the angled bristle sections are shorter than the shaft sections of the bristles that are secured in a holding arrangement.
In order to set the bristle stiffness, a further embodiment of the invention provides a holding arrangement for the bristles, that comprises at least one stop or abutment perpendicularly to the extension of the bristles, of which the position with respect to the spacing from the bent or angled bristle sections is set or adjusted in such a manner that a desired spring characteristic of the elastic bristles is defined. The free bending length of the bristles and therewith the stiffness thereof is set or adjusted by means of the crimp beads or corrugations.
It is advantageous if the holding arrangement is embodied as a sheet metal housing and the stop or abutment is a crosswise extending crimp bead or corrugation in the sheet metal housing.
As an alternative to the embodiment of the bristle mounting as a sheet metal housing with crimp beads, an end edge of the holding arrangement can also be selected as the stop, whereby the bristles lie directly against this end edge, which thus determines the free bending length of the bristles.
Insofar as brush seals are to be used for sealing rotor side faces, a seal according to the invention is especially advantageous if only a slight axial structural space is available for sealing of a rotor side face. In this case, the brush seal with the right-angled bent bristle sections is embodied as an annular disk seal in which the angled bristle ends run against the rotor side face, while the shaft sections of the bristles are oriented essentially radially.
Example embodiments of the invention will be described in connection with the accompanying drawings, in which:
FIG. 1 shows a portion of a turbomachine in the area of a seal location with a brush seal in axial section;
FIG. 1a shows an alternative embodiment of a brush seal according to FIG. 1;
FIG. 1b shows the brush seal according to FIG. 1a with a radially deflected bristle bundle; and
FIG. 2 shows the installed position of a brush seal corresponding to FIGS. 1 to 1b in cooperation with a side face seal surface of a rotor.
In the portion of a turbomachine shown in FIG. 1, a rotor is identified by 10 and a stator is identified by 20. Spaces of differing pressure P1, P2 between rotor 10 and stator 20 are sealed by means of a brush seal. The free ends of the bristles identified by 30 of the brush seal run against a circumferential surface U of
REFERENCES:
patent: 5029875 (1991-07-01), Spain et al.
patent: 5174582 (1992-12-01), Ferguson
patent: 5400586 (1995-03-01), Bagepalli et al.
patent: 5425543 (1995-06-01), Buckshaw et al.
patent: 5474306 (1995-12-01), Bagepalli et al.
patent: 5975535 (1999-11-01), Gail et al.
Barton Rhonda
Fasse W. F.
Fasse W. G.
Look Edward K.
MTU Motoren-und Turbinen-Union Muenchen GmbH
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