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WO2002012759A2 - Ensemble de joint en brosses, procede de fabrication et d'utilisation - Google Patents

Ensemble de joint en brosses, procede de fabrication et d'utilisation Download PDF

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Publication number
WO2002012759A2
WO2002012759A2 PCT/US2001/024789 US0124789W WO0212759A2 WO 2002012759 A2 WO2002012759 A2 WO 2002012759A2 US 0124789 W US0124789 W US 0124789W WO 0212759 A2 WO0212759 A2 WO 0212759A2
Authority
WO
WIPO (PCT)
Prior art keywords
seal assembly
bristles
annular holder
brash
holder
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.)
Ceased
Application number
PCT/US2001/024789
Other languages
English (en)
Other versions
WO2002012759A3 (fr
Inventor
Amitava Datta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Advanced Components and Materials Inc
Original Assignee
Advanced Components and Materials Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Advanced Components and Materials Inc filed Critical Advanced Components and Materials Inc
Priority to DE10196497T priority Critical patent/DE10196497T1/de
Priority to AU2001279229A priority patent/AU2001279229A1/en
Priority to GB0302696A priority patent/GB2380774B/en
Publication of WO2002012759A2 publication Critical patent/WO2002012759A2/fr
Publication of WO2002012759A3 publication Critical patent/WO2002012759A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
    • F16J15/3288—Filamentary structures, e.g. brush seals

Definitions

  • the invention relates generally to a brush seal assembly for sealing a gap between a high pressure area and a low pressure area, a method of manufacturing and using the brash seal assembly and, more specifically, to a brash seal assembly including a bristle strip having a plurality of bristles mounted to a flexible rail, and an annular holder, the assembly being easily manufactured and used in a variety of brush seal applications.
  • brush seals for sealing gaps, such as those found in gas turbine engines, is known in the art.
  • brush seals are often utilized to minimize leakage of fluids at circumferential gaps, such as between a machine housing and a rotor, around a rotary shaft of the engine, and between two spaces having different fluid pressure within the engine.
  • the fluid pressure within the system which may be either liquid or gas, is greater than the discharge pressure (the pressure outside the area of the engine housing, toward which the fluid will tend to leak), thus creating a pressure differential in the system.
  • the system pressure side of the brush seal is referred to as the high pressure side
  • the discharge pressure side of the brush seal is referred to as the low pressure side.
  • Conventional brush seals include, a bristle pack which is held and guided at one end between a retaining plate and a back plate.
  • the bristle pack is preferably flexible and includes a plurality of bristles for sealing the gap, the bristles having a free end for contacting one component, such as the rotor.
  • the bristle pack is welded to the retaining plate and back plate so that the bristles do not come loose during use.
  • Circular brush seals have been utilized in gas turbine engine applications to minimize leakage and increase engine fuel efficiency. Properly designed brush seals can seal up to several hundred psi of differential pressure, at surface speeds exceeding about 1000 ft/sec, and at temperatures up to about 1500 F.
  • One style brash seal is disclosed in U.S. Patent No.
  • the Reisinger brush seal 1 includes a wire bundle 2 that is wound in a U-shape and bent around a core ring 8.
  • the core ring is bent to the appropriate radius and is captured within a curved or ring-shaped tube 3 which includes a continuous slot.
  • the wire bundle 2 is contacted and surrounded by the tube 3.
  • the tube 3 is enclosed on both sides and tensioned by a pair of support rings 4 and 5 which are joined by welding at a welding joint 9 to form a housing.
  • the joined support rings provide the required clamping force to the wire bundle 2 via the tube.
  • the Hofner brush seal 1 includes a plurality of stacked bristles 2 which are clamped in a U-shape around an annular core ring 3 by clamping ring 4.
  • the clamping ring 4 is secured in an annular space U, formed between two housing portions 5 a, 5b of stator 6.
  • the legs of the bristles extend through an annular slot 7 in the clamping ring 4, towards a rotor 9.
  • the clamping ring 4 includes a C-shaped section which clamps the bristles 2 against the core ring 3 , and reverse bend portions 8a, 8b at opposite ends of the C-shaped section between which the slot 7 is formed.
  • the C-shaped section 10 of the clamping ring 4 clamps the bristles 2 against the core ring 3 concentrically with the C-shaped section.
  • the reverse bend portions 8a, 8b each extend into outwardly proj ecting radial anchor portions which form the backing elements 12a and 12b that tangentially contact the C-shaped section 10.
  • the brush seal 1 is mounted in the stator by clamping the backing elements 12aand 12b between the housing portions 5a and 5b of the stator 6.
  • a brash seal assembly comprising a bristle strip having a plurality of bristles (or bristle pack) attached to at least one rail.
  • the assembly further includes an annular holder for supporting the rail and bristles mounted thereto.
  • the bristle strip is flexible such that the strip can be readily bent by hand.
  • the annular holder is preferably U-shaped.
  • the brush seal assembly may be utilized with conventional mounting techniques, and may be mounted within a unitary or segmented holder. Once installed, the brash seal assembly acts as a static and dynamic seal in order to seal the gap between a high pressure source and a low pressure source.
  • Fig. 1 is a side view of a bristle strip including a bristle pack mounted to a flexible rail
  • Fig. 2 is a cross-sectional view taken along line 2-2 of Fig. 1
  • Fig. 3 is a cross-sectional view of Fig. 1 taken along line 2-2, showing the rails machined
  • Fig. 4 is a cross-sectional view of an annular holder for mounting the bristle strip of Fig.
  • Fig. 5 is a cross-sectional view of a brush strip assembly including an annular holder with the bristle strip mounted therein;
  • Fig. 6 is a cross-sectional view of a brash strip assembly including the annular holder with the bristle strip mounted therein after crimp rolling;
  • Fig. 7 is a cross-sectional side view of the brush strip assembly mounted between a rotor and stator;
  • Fig. 8 is a cross-sectional view of the brush strip assembly mounted within a cavity between a holding ring and back plate;
  • Fig. 9 is a cross-sectional view of the brash strip assembly mounted within a cavity between a holding ring and back plate of a segmented seal;
  • Fig. 10 is a cross-sectional view of the brash strip assembly mounted within a machined slot in a segmented seal
  • Fig. 11 is a partial cross-sectional view of the brush seal assembly mounted within a unitary housing having a machined key hole
  • Fig. 12 is a side view of a joint design for a segmented brush seal with the brash assembly mounted therein
  • Fig. 13 is a schematic view of the joint design of Fig. 12
  • Fig. 14 is a cross-sectional view of another embodiment of a low-profile brush strip assembly mounted within an "L" shaped mounting ring.
  • the brash seal assembly 10 preferably includes a bristle strip 12 having a plurality of bristles 14 mounted at an angle ( ⁇ ) to flexible rails 16a, b, and an annular holder 22 (Fig. 5) for supporting the bristle strip.
  • the bristles 14 each include a first, or fixed end 18 which are supported between the rails, and a second, or free end 20 opposite the first end.
  • the bristles are preferably supported on the rails at an angle, e (theta), of about 0-70° to the radial direction (“r") » as shown in Fig. 1.
  • e theta
  • the free ends 20 of the bristles are preferably orientated in the direction of rotation of the rotor 24 as indicated by arrow "A" (Fig. 7), or other moving component of the system.
  • the bristles may preferably be held between the rails by welding, although other methods of attachment may be utilized as would be known to those of skill in the art.
  • the plurality of bristles 14 may be secured individually, or in bristle packs, and are preferably made of a high temperature alloy, such as a cobalt-based superalloy (for example Haynes 25) to help maintain the shape and orientation of the bristles, and to provide wear-resistance.
  • a high temperature alloy such as a cobalt-based superalloy (for example Haynes 25)
  • the rails are preferably machined to a pre-determined width "w" with radiused corners, such that the rails (including weld 25) have a pre-determined outer diameter "O D ".
  • each rail has a thickness (t b t 2 ) which may be equal to each other, or different.
  • the width and thickness of the rails are such that bristle strip 12 is substantially flexible, i.e. can be bent readily by hand to fit within the annular holder.
  • the width of the rails is preferably in the range of about .05-.1 inch, and the thickness is in the range of about .05-.1 inch.
  • the width and thickness of the rails is preferably equal, and most preferably about .063 inch each.
  • the width and the thickness may be varied, depending upon the application, as would be known to those of skill in the art.
  • the rails may preferably be made of any suitable material, such as a nickel-base superalloy (for example Inco 625), which can withstand a high temperature environment, while remaining flexible.
  • the brash seal assembly further includes an annular holder 22, which preferably has a U-shape including an inner wall 27 defining a channel 26 having an inner diameter (I D ).
  • the annular holder may be formed as a unitary member as shown in Fig.4, and is preferably sized to receive the bristle strip therein.
  • the rails of the bristle strip are inserted into the channel 26 of the holder so that the outer diameter of the rails are preferably in close contact with the inner diameter of the annular holder along the length thereof, and so that the free end 20 of the bristles extend from the holder (Fig. 5).
  • the length of the bristle strip may thereafter be cut to the approximate length of the circumference of the annular holder (or, if segmented, the length of the segment of the holder).
  • the holder may be formed by any suitable manner, such as by roll forming, and is preferably be made of any suitable material, such as a nickel-base superalloy (for example Inco 718) which can withstand a high temperature environment.
  • a first gap (g L ) remains between a first side 28 of an inner wall of the holder and the adjacent bristles
  • a second gap (g 2 ) remains between a second side 30 of the inner wall of the holder and the adjacent bristles.
  • the size of the gaps are determined by the thickness of the rails, which may or may not be equal to each other, as described above.
  • the bristle pack When a pressure is applied to the high pressure side, the bristle pack is pushed against the side of the holder or the back plate.
  • the gap size By controlling the gap size, the direct contact of the bristle pack with the holder/back plate is partially retarded thereby allowing the bristles to move more freely without a hysteresis effect.
  • the gap which faces the low pressure side should be about .040 inch or less so as to avoid direct contact of the bristle pack with the holder.
  • the holder may be compressed on either side along its length as illustrated by arrows "C", so that the rails are nested within the holder.
  • the first and second sides 28, 30 of the of the inner wall of the holder do not contact the bristles after nesting the rails within the holder (Fig. 6).
  • the ends 31 , b of the annular holder may be turned inward, toward the bristles, in order to contact the same (Fig. 9).
  • the outside surface of the U-ring acts as a static seal as well as pushes the strip assembly into a secured position as the front and back plates (46 and 40) are pressed together during assembly.
  • the holder may be compressed in a variety of ways, including crimp rolling, and the rails may preferably be spot welded to the holder in order to prevent relative movement between the holder and the bristle strip, if compression does not provide adequate nesting of the rails to prevent relative movement.
  • other methods of attaching the bristle strip within the annular holder which prevents relative movement there between may be utilized, as would be known to one of skill in the art.
  • the inner diameter (I D ) of the bristles are then machined, such as by electro-discharge machining, so that the bristles have a constant height ("h") along the length of the bristles, the height being measured from the O D of the annular holder to the I D of the bristles.
  • the brush seal assembly is then installed within a cavity or slot 32 in housing 33.
  • the brush seal assembly may preferably be secured within the slot 32 by a holding ring 34, which may be of a conventional design as would be known to those of skill in the art.
  • the holding ring may include both a front plate and a back plate for supporting the brush seal assembly there between.
  • the housing may have a diameter of up to about 36 inches, as is conventional.
  • the brush seal assembly is mounted such that a first side of the assembly faces a high pressure source (P H ), whereas a second side faces a lower pressure source (P L ), Fig. 8.
  • the annular holder provides a sealing interface 37 between the holding ring 34 and the slot 32, while the bristles provide sealing between the moving surface (rotor), the stationary housing, and the low and high pressure sources.
  • the brash seal assembly acts as a static and dynamic seal in order to seal the gap between the high pressure source and the low pressure source.
  • a low-profile brash seal particularly suited for aerospace applications can also be fabricated by attaching the U-ring/bristle strip assembly to an L-shaped ring 45 which acts as the back plate on the lowpressure side.
  • the annular holder 22 may be shortened and tack welded, or otherwise attached, to a top portion 47 of the L-ring 45.
  • the heavier back plate 40 can be eliminated, without sacrificing support of the brash seal.
  • it can be particularly important to reduce weight without sacrificing other features, such as support.
  • the L-shaped ring of Fig. 14 accomplishes both these objectives in a simple, easy to manufacture manner.
  • the brush seal When utilized in land based applications, such as for power generation, the brush seal may preferably be segmented and may be supported within a segmented housing ring 40. As shown in Fig. 9, the segmented ring 40 is machined in order to form a slot 42 for receipt of the brash seal assembly therein, and preferably includes a stepped portion 44 for supporting a face ring 46.
  • the brush seal assembly is preferably sandwiched between the face ring and the segmented ring, in order to hold the brush seal assembly within the segmented housing ring.
  • the inner diameter (I D ) of the bristles can be machined after installing the brush seal assembly within the segmented ring.
  • the flexible brush seal assembly can also be directly installed into a slot or channel 48 which may be machined or cast into a unitary (i.e. one piece) housing 50 for the segmented brash seal as shown in Figs. 10 and 11.
  • a unitary housing 50 for the segmented brash seal as shown in Figs. 10 and 11.
  • the brash seal assembly is preferably inserted into the channel at one end, is positioned within the length of the channel, and secured into the channel, such as by tack welding at the two ends of the housing.
  • the inner diameter (I D ) of the bristles may also be machined after installing the brash seal assembly within the unitary housing.
  • the channel is preferably tapered (Fig.
  • the rails may need to be compressed which results in the U-shaped holder acting as a spring to hold the brush seal assembly within the slot.
  • the channel may be T-shaped (Fig. 10), and the brush seal assembly may be positioned and retained within the slot by shims 52 which may be either flat or shaped.
  • the ends 54 of the segmented housing may preferably be stepped, staggered, and cut at substantially the same angle as the bristles, as shown in Fig. 12.
  • the ends of the segmented housing may be substantially straight, as known in the art.
  • the bristle strip is formed by securing the first end 18 of the plurality of bristles 14 at an angle between rails 16a, b.
  • the rails may then be machined to a pre-determined width "w" with radiused comers, so that the rails have a pre-determined outer diameter "O D ".
  • the rails of the bristle strip are then inserted within channel 26 of the annular holder so that the outer diameter of the rails are in close contact with the inner diameter of the annular holder along the length thereof, and so that the free ends of the bristles extend from the holder.
  • the length of the bristle strip may thereafter be cut to the approximate length of the circumference of the annular holder (or, if segmented, the length of the segment of the holder).
  • the holder may then be compressed on either side along its length, so that the rails are nested within the holder.
  • the inner diameter (I D ) of the bristles are thereafter preferably machined so that the bristles have a constant height ("h") along the length of the bristles, the height being measured from the O D of the annular holder to the I D of the bristles.
  • the brash seal assembly is then installed within a cavity or slot in a housing which may be either segmented or non-segmented.
  • the brash seal assembly is mounted such that a first side of the assembly faces a high pressure source (P H ), whereas a second side faces a lower pressure source (P L ).
  • the annular ring of the present embodiment provides a sealing interface within the housing cavity or slot, while the bristles provide sealing between the moving surface, the stationary housing and the low and high pressure sources.
  • the present invention provides a brash seal assembly which is inexpensive and easy to manufacture, and which can be readily replaced when worn.
  • the provision of an annular holder allows the brush seal assembly to be readily removed and replaced, and also allows the bristle strip to be replaced while the housing may be reused.
  • the size of the brash seal assembly is also very accurate so as to provide optimal sealing between components. It will be understood that various modifications may be made to the embodiment disclosed herein.
  • the annular holder is shown and described as U-shaped, it should be understood that the annular holder may take other configurations.
  • the holder may have an L-shaped configuration, with the bristle strip being secured to the holder such as by tack welding.
  • the rails may be constructed as separate pieces, or as a single, unitary piece if desired.
  • the annular holder may be unitary, or formed from multiples pieces.
  • the brash seal assembly may be used for a variety of sealing applications other than those specifically disclosed herein. Therefore, the above description should not be construed as limiting, but merely as exemplifications of a preferred embodiment. Those skilled in the art will envision other modifications within the scope, spirit and intent of the invention.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

L'invention concerne un ensemble de joint en brosses comportant une bande pourvue de plusieurs soies fixées à un angle par rapport au moins à une barre et un support annulaire portant la bande de soies. Dans un mode de réalisation, la bande de soies est flexible de telle manière que ladite bande peut être facilement cintrée manuellement, ledit support annulaire présentant de préférence une forme en U. On peut utiliser l'ensemble de joint en brosses conjointement à des techniques de montage traditionnelles et on peut les monter à l'intérieur d'un support unitaire ou segmenté. Une fois installé, ledit ensemble agit comme un joint statique et dynamique en vue de sceller le trou entre une source de haute pression et une autre de basse pression.
PCT/US2001/024789 2000-08-09 2001-08-08 Ensemble de joint en brosses, procede de fabrication et d'utilisation Ceased WO2002012759A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE10196497T DE10196497T1 (de) 2000-08-09 2001-08-08 Anordnung für eine Bürstendichtung, Verfahren zur Herstellung und Verwendung
AU2001279229A AU2001279229A1 (en) 2000-08-09 2001-08-08 Brush seal assembly, method of manufacture and use
GB0302696A GB2380774B (en) 2000-08-09 2001-08-08 Brush seal assembly, method of manufacture and use

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US22388600P 2000-08-09 2000-08-09
US60/223,886 2000-08-09
US63896700A 2000-08-15 2000-08-15
US09/638,967 2000-08-15

Publications (2)

Publication Number Publication Date
WO2002012759A2 true WO2002012759A2 (fr) 2002-02-14
WO2002012759A3 WO2002012759A3 (fr) 2002-08-01

Family

ID=26918224

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/024789 Ceased WO2002012759A2 (fr) 2000-08-09 2001-08-08 Ensemble de joint en brosses, procede de fabrication et d'utilisation

Country Status (4)

Country Link
AU (1) AU2001279229A1 (fr)
DE (1) DE10196497T1 (fr)
GB (1) GB2380774B (fr)
WO (1) WO2002012759A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1890056A1 (fr) * 2006-08-16 2008-02-20 Siemens Aktiengesellschaft Joint à brosses pour une turbomachine
US9074487B2 (en) 2011-08-17 2015-07-07 General Electric Company Self-lubricating brush seal assembly and method of reducing leakage
CN117301544A (zh) * 2023-11-16 2023-12-29 海宁市力佳隆门窗密封条有限公司 一种门底毛刷条的制作方法及其设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5066024A (en) 1988-01-29 1991-11-19 Mtu Motoren- Und Turbinen-Union Munchen Gmbh Brush-type seal
US5794938A (en) 1996-01-08 1998-08-18 Mtu Motoren-Und Turbinen-Union Munchen Gmbh Brush seal secured by a C-shaped clamping ring

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR379209A (fr) * 1906-07-03 1907-10-29 Sebastian Ziani De Ferranti Perfectionnements aux turbines à fluide élastique
FR2690493B1 (fr) * 1992-04-23 1996-10-25 Snecma Joint annulaire a brosse.
US6231047B1 (en) * 1998-05-29 2001-05-15 Eg&G Engineered Products Brush seal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5066024A (en) 1988-01-29 1991-11-19 Mtu Motoren- Und Turbinen-Union Munchen Gmbh Brush-type seal
US5794938A (en) 1996-01-08 1998-08-18 Mtu Motoren-Und Turbinen-Union Munchen Gmbh Brush seal secured by a C-shaped clamping ring

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1890056A1 (fr) * 2006-08-16 2008-02-20 Siemens Aktiengesellschaft Joint à brosses pour une turbomachine
US9074487B2 (en) 2011-08-17 2015-07-07 General Electric Company Self-lubricating brush seal assembly and method of reducing leakage
CN117301544A (zh) * 2023-11-16 2023-12-29 海宁市力佳隆门窗密封条有限公司 一种门底毛刷条的制作方法及其设备

Also Published As

Publication number Publication date
WO2002012759A3 (fr) 2002-08-01
GB0302696D0 (en) 2003-03-12
GB2380774B (en) 2004-04-14
GB2380774A (en) 2003-04-16
DE10196497T1 (de) 2003-07-03
AU2001279229A1 (en) 2002-02-18

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