EP0657624B1 - Paroi de turbomachine comprenant un corps d'étanchéité - Google Patents
Paroi de turbomachine comprenant un corps d'étanchéité Download PDFInfo
- Publication number
- EP0657624B1 EP0657624B1 EP19940402807 EP94402807A EP0657624B1 EP 0657624 B1 EP0657624 B1 EP 0657624B1 EP 19940402807 EP19940402807 EP 19940402807 EP 94402807 A EP94402807 A EP 94402807A EP 0657624 B1 EP0657624 B1 EP 0657624B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- casing
- sealing body
- flanges
- turbomachine
- flexible envelope
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/005—Sealing means between non relatively rotating elements
Definitions
- the invention relates to a wall of turbomachine comprising a sealing body.
- turbomachine walls used for aircraft engines include in particular a outer casing which ensures cohesion by its rigidity of the assembly and an internal ferrule, concentric with the casing and formed of annular segments assembled to it and between them, which serve to delimit the vein gas flow.
- FR-A-1 235 694 a firewall seal disposed between two assembly flanges and comprising an internal fiberfill, compressible and an envelope flexible deformable.
- the casing, the ferrule and the flanges transverse assembly of the segments to the casing then delimit empty partitioned volumes which are the seat of gas leaks that affect good performance of the machine.
- these often very hot gases produce radial thermal expansions and longitudinal on the casing, which affect the ferrule and therefore increase the radial clearances between the ferrule and the free ends of the rotor blades.
- a larger part of the gas flow escapes the compression by the blades, then in the drive of the rotor while relaxing. So we are in front of a second because of lower yield.
- the object of the invention which is to fill totally or almost these empty form volumes often tormented, is reached by housing bodies sealing formed of a flexible envelope and little breathable and insulating fluff material thermally and contained in the flexible envelope.
- the flexibility of the envelope and fill, attached to the compressibility of the latter, allow the body sealing to be molded on the surfaces of the housing, ferrule segments, or even flanges, which virtually eliminates gas leaks.
- the turbomachine is shown at the location of a high pressure compressor where the invention should find the most utility. It has a housing 1 exterior whose outer surface carries a certain number of bosses 2 circular in which we have drilled 3 oblique bolt holes. The internal surface of the casing 1 is smooth opposite the bosses 2, to that flanges 4 of ferrule segments 5 can be there to press. The flanges 4 are also provided with holes for bolt 6, which are an extension of those 3 of bosses 2, and bolts 7 are inserted therein retain the flanges 4 in place, with a component radial force which applies them to the surface of the housing 1 and an axial component that allows them to block seals 8 against shoulders 9 of the casing 1.
- the essential element of the seals 8 is not the ring rigid which is thus compressed and serves as their reinforcement, but a thin and oblique veil 10, one end of which is embedded in the ring and the other end, free, is supported on the segmented flange 4 to cover the bolt holes 6 and recesses 11 made over a large part of their extension so that the flanges 4 do not rest actually on the casing 1 only by a small part of their circumference, which avoids transmissions excessive heat and reduces the risk of jamming during assembly.
- the shell segments 5 delimit by outside an annular gas flow stream 14. They must form such a continuous surface and as regular as possible to avoid leaks and pressure losses and they are juxtaposed by different kinds of joints but some of them can be assembled by sockets 15 of a lip one in a throat of the other.
- Certain shell segments 5 bear vanes 16 for rectifying the gas flow, which are arranged in stages alternating with stages movable blades 17 fixed to the rotor 18.
- Games 19 extend between the ferrule segments 5 and the vanes mobile 17, and we want them to be as small as possible in order to avoid an appreciable portion gases do not flow there. That’s why we designed many devices, not shown here but which are extensively described and the subject of many patents, to control the value of games 19 to everyone machine speeds: these are blowing of gas taken from another part of the machine to adjust the thermal expansions of the shell segments 5.
- This harmful flow is prohibited (figure 2) by means of a compound sealing body 25 essentially of a flock 26 contained in a flexible envelope 27 and which occupies all or almost of these empty volumes 20 thanks to the flexibility of the sealing body 25 and the compressibility of the wad 26, which deform under the action of surrounding pressure differences and espouse shapes of the cavity 20.
- the materials used and especially those of the flock 26 are bad conductors heat and not very breathable, while being sufficiently porous that the compressibility of the fill 26 is not compromised.
- Wad 26 can have a fibrous structure, and the envelope 27 be formed of a fabric.
- the fiber can be quartz wool or metallic felts, and the fabric can be a intertwining of quartz, glass, carbon wires or metal.
- Figure 3 shows a design a little different where the sealing body, referenced then 125 and still consisting of a flock 26 contained in a flexible envelope 27, is completed by a spring 28 of circular extension and whose cross section and linear and forms an acute angle, or a pin open: it consists of two sheets 29 substantially rigid than an elastic hinge 30 connects, and the volume 31 enclosed by the sheets 29 is empty.
- the spring 28 is compressed, so that the sheets 29 tend to move apart, opening the spring 28, and the flock 26 is driven outwards and driven back against the surfaces of housing 1 and ferrule segments 5, including in their crevices.
- Figure 4 shows the body seal 125 in an isolated state. It is manufactured under shape of a rod whose desired length is cut and that we roll to form a ring whose ends can be closed, or even joined between them by a seam, a weld or any other suitable means for envelope 27. If the sheets 29 are elastic and therefore have a certain stiffness, however, they should be flexible enough to be bent.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gasket Seals (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
- la figure 1 est une vue générale d'une portion de turbomachine où l'élément constitutif de l'invention n'est pas représenté,
- la figure 2 représente une première réalisation de l'invention,
- la figure 3 représente une autre réalisation de l'invention,
- et la figure 4 représente isolément le corps d'étanchéité de la seconde réalisation.
Claims (3)
- Paroi de turbomachine comprenant un carter extérieur (1), une virole entourée par le carter et composée de segments (5) assemblés entre eux et, par des brides (4), au carter, et délimitant des cavités cloisonnées (20) avec le carter et les brides, lesdite cavités étant occupées par un corps d'étanchéité (25, 125) formé d'une enveloppe souple (27) en tissu et d'une bourre fibreuse (26), dans laquelle l'enveloppe souple est peu perméable à l'air et se déforme sous l'action des différences de pressions environnantes pour épouser les formes des cavités (20).
- Paroi de turbomachine suivant la revendication 1, caractérisée en ce que le corps d'étanchéité est également formé d'un ressort (28) contenu dans l'enveloppe souple et comprimé à une section plus petite qu'à l'état libre.
- Paroi de turbomachine suivant la revendication 2, caractérisée en ce que le ressort a une section en épingle ouverte.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9314699 | 1993-12-08 | ||
FR9314699A FR2713709B1 (fr) | 1993-12-08 | 1993-12-08 | Paroi de turbomachine comprenant un corps d'étanchéité. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0657624A1 EP0657624A1 (fr) | 1995-06-14 |
EP0657624B1 true EP0657624B1 (fr) | 1998-02-04 |
Family
ID=9453679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19940402807 Expired - Lifetime EP0657624B1 (fr) | 1993-12-08 | 1994-12-07 | Paroi de turbomachine comprenant un corps d'étanchéité |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0657624B1 (fr) |
DE (1) | DE69408423T2 (fr) |
FR (1) | FR2713709B1 (fr) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9915637D0 (en) * | 1999-07-06 | 1999-09-01 | Rolls Royce Plc | A rotor seal |
GB0108398D0 (en) * | 2001-04-04 | 2001-05-23 | Siemens Ag | Seal element for sealing a gap and combustion turbine having a seal element |
FR2957115B1 (fr) * | 2010-03-05 | 2012-03-30 | Snecma | Etage de turbine dans une turbomachine |
GB201103682D0 (en) * | 2011-03-04 | 2011-04-20 | Rolls Royce Plc | A turbomachine casing assembly |
EP2620653B1 (fr) * | 2012-01-25 | 2015-06-24 | Rolls-Royce plc | Ensemble carter de turbomachine avec cavité de rétention d'aubes |
DE102013213834A1 (de) * | 2013-07-15 | 2015-02-19 | MTU Aero Engines AG | Verfahren zum Herstellen eines Isolationselements und Isolationselement für ein Gehäuse eines Flugtriebwerks |
EP2829689B1 (fr) * | 2013-07-23 | 2019-03-13 | MTU Aero Engines GmbH | Dispositif d'isolation pour une turbine à gaz thermique et turbine à gaz thermique equippée avec celui-ci |
US10337353B2 (en) | 2014-12-31 | 2019-07-02 | General Electric Company | Casing ring assembly with flowpath conduction cut |
FR3086323B1 (fr) * | 2018-09-24 | 2020-12-11 | Safran Aircraft Engines | Carter interne de turmomachine a isolation thermique amelioree |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1235694A (fr) * | 1958-07-28 | 1960-07-08 | Connecticut Hard Rubber Co | Structure de joint résistant aux températures élevées et aux carburants pour moteurs à réaction et applications analogues |
FR2051912A5 (fr) * | 1969-07-01 | 1971-04-09 | Rabouyt Denis | |
US4030288A (en) * | 1975-11-10 | 1977-06-21 | Caterpillar Tractor Co. | Modular gas turbine engine assembly |
DE2620762C2 (de) * | 1976-05-11 | 1977-11-17 | Motoren- und Turbinen-Union München GmbH, 8000 München | Spaltdichtung für Strömungsmaschinen, insbesondere Gasturbinenstrahltriebwerke |
JPS61164003A (ja) * | 1985-01-11 | 1986-07-24 | Hitachi Ltd | 流体機械における熱伸びのある静翼部のシ−ル装置 |
US5104286A (en) * | 1991-02-08 | 1992-04-14 | Westinghouse Electric Corp. | Recirculation seal for a gas turbine exhaust diffuser |
-
1993
- 1993-12-08 FR FR9314699A patent/FR2713709B1/fr not_active Expired - Fee Related
-
1994
- 1994-12-07 DE DE1994608423 patent/DE69408423T2/de not_active Expired - Fee Related
- 1994-12-07 EP EP19940402807 patent/EP0657624B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR2713709B1 (fr) | 1996-01-12 |
DE69408423T2 (de) | 1998-07-30 |
FR2713709A1 (fr) | 1995-06-16 |
DE69408423D1 (de) | 1998-03-12 |
EP0657624A1 (fr) | 1995-06-14 |
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