US3694882A - Method for providing a corrugated seal in an elastic fluid machine - Google Patents

Method for providing a corrugated seal in an elastic fluid machine Download PDF

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Publication number
US3694882A
US3694882A US75194A US3694882DA US3694882A US 3694882 A US3694882 A US 3694882A US 75194 A US75194 A US 75194A US 3694882D A US3694882D A US 3694882DA US 3694882 A US3694882 A US 3694882A
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US
United States
Prior art keywords
strip
groove
corrugated
deforming
seal
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
Application number
US75194A
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English (en)
Inventor
John William Desmond
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.)
PITTSBURGH ELECTRIC CORP
Westinghouse Electric Corp
Original Assignee
PITTSBURGH ELECTRIC CORP
Westinghouse Electric Corp
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 PITTSBURGH ELECTRIC CORP, Westinghouse Electric Corp filed Critical PITTSBURGH ELECTRIC CORP
Application granted granted Critical
Publication of US3694882A publication Critical patent/US3694882A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F16J15/44—Free-space packings
    • F16J15/444—Free-space packings with facing materials having honeycomb-like structure
    • 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
    • F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
    • F01D11/12—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part
    • F01D11/127—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part with a deformable or crushable structure, e.g. honeycomb
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/60—Structure; Surface texture
    • F05D2250/61—Structure; Surface texture corrugated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00—Metal working
    • Y10S29/034—Scaling with other step
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/4932—Turbomachine making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/4932—Turbomachine making
    • Y10T29/49321—Assembling individual fluid flow interacting members, e.g., blades, vanes, buckets, on rotary support member
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49833—Punching, piercing or reaming part by surface of second part
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49915—Overedge assembling of seated part
    • Y10T29/49922—Overedge assembling of seated part by bending over projecting prongs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49936—Surface interlocking

Definitions

  • ABSTRACT A turbine rotor .blade path seal consists of a corrugated strip of sheet metal secured edgewise in an annular groove in the turbine cylinder or casing.
  • the corrugated seal strip requires no edge rolling for the various diameters of the different stages of a multistage turbine.
  • one pattern of a seal strip which is easily customized and assembled can be utilized for all stages of a turbine.
  • the seal strip is caulked or interlocked in the groove at assembly by means of a special tool.
  • This invention relates, generally, to elastic fluid machines and, more particularly, to rotor blade path seals for axial flow turbines.
  • a corrugated strip of sheet metal is secured edgewise in an annular groove in a turbine casing to provide an annular seal strip around a row of rotor blades.
  • the corrugated strip is initially rectilinear, but easily conforms to the' curvature of the casing when it is installed and requires no edge rolling for the various diameters of different stages.
  • the strip is secured in the cylinder by peening or caulking it in the groove by means of an assembly tool.
  • the sealing action of the corrugated strip is accomplished by having the end of the strip in full contact with the bottom of the groove.
  • FIG. 1 is a view, in elevation, of a portion of an axial flow turbine having a rotor blade path seal constructed in accordance with principles of the invention
  • FIG. 2 is a view, in section, taken along the line Il-II of FIG. 1;
  • FIG. 3 is a view, in plan, of a portion of a seal strip employed in FIG. 1;
  • FIG. 4 is a view, in elevation, of the seal strip shown in FIG. 3;
  • FIG. 5 is a view, partly in elevation and partly in section, showing the manner of utilizing an assembly tool to install the seal strip
  • FIG. 6 is an enlarged detail view of the lower portion of the assembly tool and the seal strip.
  • FIG. 7 is an isometric view showing a portion of the seal strip installed in the turbine cylinder.
  • DESCRIPTION OF THE PREFERRED EMBODIMENT may be secured to arcuate shroud segments 16 leaving an annular clearance space 18 between the casing 12 and the shroud 16 as shown in FIG. 2.
  • annular seal 20 is provided in the space 18.
  • the seal 20 is a corrugated strip of sheet metal secured edgewise, in an annular groove 22 provided in the casing 12 and encircling the annular row of rotor blades 14. A major portion of the seal strip extends beyond the casing 12 towards the rotor blades.
  • the corrugation impart flexibility tothe seal strip 20 and permit it to conform to the curvature of the casing 12 when the strip is inserted edgewise into the groove 22.
  • no edge rolling of the seal strip is required for the various diameters of different stages in a multi-stage turbine.
  • the corrugations permit edge forming during normal assembly without using edge rolling equipment.
  • the turbine casing 12 is divided into an upper half and a lower half bolted together at horizontal joints 24.
  • the seal 20 may be made in two halves, each half being of suff cient length to reach from one horizontal joint to the other when installed in the groove 22.
  • the seal 20 ' is disposed transversely of the direction of flow of the"
  • the height of the corrugations of the seal strip 20 is such that the strip fits snugly into the groove 22.
  • Each ridge has a flat surface 28 which contacts a side of the groove'22 and a ligament 29 disposed between the flat surfaces 28 at an oblique angle with respect to the surfaces 28, to allow the corrugated strip todeform to accommodate the insertion of the corrugated strip tightly inthe groove 22, thereby preventing leakage of the motive fluid through the groove.
  • the seal strip 20 may be installed and secured in the groove 22 by means of an assembly tool 30 shown in FIG. 5.
  • the tool 30 comprises a peening or caulking member 32 movably disposed inside an inner sleeve 34 which is movably disposed inside an outer sleeve 36, a compression spring 38 surrounding the sleeve 34 between the lower end of the sleeve 36 and a flange 40 on the sleeve 34, and a wedge 42 disposed at the lower end of the caulking member 32.
  • the members of the tool are retained together by means of a pin 44 secured in the sleeve 36 and extending through elongated slots 46 and 48 in the sleeve 34 and the member 32, respectively.
  • the wedge 42 is movably attached to the caulking member 32 by two plates 50 secured to opposite sides of the wedge and a pin 52 secured in the member 32 and extending into openings 54 in the plates 50 which extend a short distance along opposite sides of the member 32. The.
  • openings 54 are of such a size that limited movement of the member 32 relative to the wedge 42 is permitted.
  • the upper end of the member 32 may be struck with a hammer to cause the projection 56 to cut and force a projection 58 from the flat surface 28 of the strip into a sidewall of the groove 22 in the cylinder 12.
  • the bottom end strikes the sloping surface 60 of the wedge 42, thereby causing the projection 56 to drive the projection 58 into the side wall of the groove.
  • the pressure of the spring 38 on the sleeve 34 is held on the corrugated strip 20 assures that the strip is fully inserted into the groove 22.
  • the tool 30 can be withdrawn and then utilized to caulk or interlock the seal strip at another point as shown in FIG. 7.
  • the seal strip may be interlocked at any desired number of points.
  • a commercial benefit of this invention is that the seal strip can be replaced in the turbine in the field quickly and economically, thereby avoiding the delay required to return the turbine to the factory.
  • the flexible corrugated seal permits the seal strip sections to be shipped and handled conveniently as straight, i.e., rectilinear, sections.
  • the invention provides a turbine rotor blade path seal member which can be economically manufactured and installed.
  • the seal member can be utilized for all stages of a multi-stage turbine and does not require special forming equipment at the assembly area.
  • a method for providing an annular strip between rotating and stationary portions of an elastic fluid machine comprising the steps of:
  • a method for providing an annular seal between rotating and stationary portions of an elastic fluid machine comprising the steps of:
  • annular seal having generally radially extending sidwalls in one of said portions of said machine

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
US75194A 1970-09-24 1970-09-24 Method for providing a corrugated seal in an elastic fluid machine Expired - Lifetime US3694882A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US7519470A 1970-09-24 1970-09-24

Publications (1)

Publication Number Publication Date
US3694882A true US3694882A (en) 1972-10-03

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Country Status (3)

Country Link
US (1) US3694882A (enExample)
JP (1) JPS4946649B1 (enExample)
CA (1) CA995139A (enExample)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3771798A (en) * 1972-05-11 1973-11-13 G Mcdonald Method of repairing knife edge fins in spacer fluid seals
US3846899A (en) * 1972-07-28 1974-11-12 Gen Electric A method of constructing a labyrinth seal
US3867061A (en) * 1973-12-26 1975-02-18 Curtiss Wright Corp Shroud structure for turbine rotor blades and the like
US4370094A (en) * 1974-03-21 1983-01-25 Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft Method of and device for avoiding rotor instability to enhance dynamic power limit of turbines and compressors
US4526509A (en) * 1983-08-26 1985-07-02 General Electric Company Rub tolerant shroud
US4767267A (en) * 1986-12-03 1988-08-30 General Electric Company Seal assembly
US4868963A (en) * 1988-01-11 1989-09-26 General Electric Company Stator vane mounting method and assembly
US4953282A (en) * 1988-01-11 1990-09-04 General Electric Company Stator vane mounting method and assembly
US5192185A (en) * 1990-11-01 1993-03-09 Rolls-Royce Plc Shroud liners
US5316405A (en) * 1992-10-29 1994-05-31 Josif Atanasoski Cyclone seal expansion joint
US6860484B2 (en) * 2000-02-12 2005-03-01 Alstom (Switzerland) Ltd. Rotor seal with folding strip
EP1715224A1 (de) * 2005-04-18 2006-10-25 Siemens Aktiengesellschaft Dichtung für eine Strömungsmaschine
US20090191050A1 (en) * 2008-01-24 2009-07-30 Siemens Power Generation, Inc. Sealing band having bendable tang with anti-rotation in a turbine and associated methods
US20120076642A1 (en) * 2010-09-23 2012-03-29 Chiu Ya-Tien Sealing assembly for use in turbomachines and method of assembling same
RU2447294C2 (ru) * 2010-02-02 2012-04-10 Сергей Владимирович Ушинин Вставка сотового надбандажного уплотнения паровой турбины и способ установки вставок сотового надбандажного уплотнения
US20160047265A1 (en) * 2013-04-03 2016-02-18 Mitsubishi Heavy Industries, Ltd. Rotating machine
US20180142567A1 (en) * 2016-11-18 2018-05-24 MTU Aero Engines AG Sealing system for an axial turbomachine and axial turbomachine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9896970B2 (en) * 2014-11-14 2018-02-20 General Electric Company Method and system for sealing an annulus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US940802A (en) * 1908-04-20 1909-11-23 Westinghouse Machine Co Elastic-fluid turbine.
US1424242A (en) * 1920-09-04 1922-08-01 Westinghouse Electric & Mfg Co Blading
US2871038A (en) * 1955-09-22 1959-01-27 Orenda Engines Ltd Labyrinth seals

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US940802A (en) * 1908-04-20 1909-11-23 Westinghouse Machine Co Elastic-fluid turbine.
US1424242A (en) * 1920-09-04 1922-08-01 Westinghouse Electric & Mfg Co Blading
US2871038A (en) * 1955-09-22 1959-01-27 Orenda Engines Ltd Labyrinth seals

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3771798A (en) * 1972-05-11 1973-11-13 G Mcdonald Method of repairing knife edge fins in spacer fluid seals
US3846899A (en) * 1972-07-28 1974-11-12 Gen Electric A method of constructing a labyrinth seal
US3867061A (en) * 1973-12-26 1975-02-18 Curtiss Wright Corp Shroud structure for turbine rotor blades and the like
US4370094A (en) * 1974-03-21 1983-01-25 Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft Method of and device for avoiding rotor instability to enhance dynamic power limit of turbines and compressors
US4526509A (en) * 1983-08-26 1985-07-02 General Electric Company Rub tolerant shroud
US4767267A (en) * 1986-12-03 1988-08-30 General Electric Company Seal assembly
US4868963A (en) * 1988-01-11 1989-09-26 General Electric Company Stator vane mounting method and assembly
US4953282A (en) * 1988-01-11 1990-09-04 General Electric Company Stator vane mounting method and assembly
US5192185A (en) * 1990-11-01 1993-03-09 Rolls-Royce Plc Shroud liners
US5316405A (en) * 1992-10-29 1994-05-31 Josif Atanasoski Cyclone seal expansion joint
US6860484B2 (en) * 2000-02-12 2005-03-01 Alstom (Switzerland) Ltd. Rotor seal with folding strip
EP1715224A1 (de) * 2005-04-18 2006-10-25 Siemens Aktiengesellschaft Dichtung für eine Strömungsmaschine
US20090191050A1 (en) * 2008-01-24 2009-07-30 Siemens Power Generation, Inc. Sealing band having bendable tang with anti-rotation in a turbine and associated methods
RU2447294C2 (ru) * 2010-02-02 2012-04-10 Сергей Владимирович Ушинин Вставка сотового надбандажного уплотнения паровой турбины и способ установки вставок сотового надбандажного уплотнения
US20120076642A1 (en) * 2010-09-23 2012-03-29 Chiu Ya-Tien Sealing assembly for use in turbomachines and method of assembling same
US20160047265A1 (en) * 2013-04-03 2016-02-18 Mitsubishi Heavy Industries, Ltd. Rotating machine
US10247025B2 (en) * 2013-04-03 2019-04-02 Mitsubishi Heavy Industries, Ltd. Rotating machine
US20180142567A1 (en) * 2016-11-18 2018-05-24 MTU Aero Engines AG Sealing system for an axial turbomachine and axial turbomachine

Also Published As

Publication number Publication date
CA995139A (en) 1976-08-17
JPS4946649B1 (enExample) 1974-12-11

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