US2809801A - Turbine rotor construction - Google Patents

Turbine rotor construction Download PDF

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Publication number
US2809801A
US2809801A US283100A US28310052A US2809801A US 2809801 A US2809801 A US 2809801A US 283100 A US283100 A US 283100A US 28310052 A US28310052 A US 28310052A US 2809801 A US2809801 A US 2809801A
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United States
Prior art keywords
slot
shoulders
blade
root portion
turbine rotor
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Expired - Lifetime
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US283100A
Inventor
Edmund C Curry
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Ingersoll Rand Co
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Ingersoll Rand Co
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Priority to US283100A priority Critical patent/US2809801A/en
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Publication of US2809801A publication Critical patent/US2809801A/en
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    • 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
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3023—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses
    • F01D5/303—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses in a circumferential slot
    • F01D5/3038—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses in a circumferential slot the slot having inwardly directed abutment faces on both sides

Definitions

  • This invention relates to turbine rotor construction and more particularly to that type of turbine rotor which is provided with a hub and blading formed separately and adapted to be attached thereto.
  • Another object of the invention is to provide a form of blade root which will properly support the blade upon the hub.
  • Figure 1 shows a fragment of a turbine hub shown in side elevation and partly in central section indicating the method of which the turbine blades are held in place therein according to a preferred embodiment of the invention
  • Fig. 2 is a transverse axial section across aportion of the hub and blading shown in Figure 1, showing more particularly the blade root section,
  • Fig. 3 is a bottom view of the root portion of the blade, the profile of the blade portion being indicated in broken lines;
  • Fig. 4 is a perspective view of the blade root and a portion of the blade portion proper.
  • Figure 5 is an enlarged scale view in longitudinal section of the lower end of the blade root showing more particularly the resilient finger construction.
  • Figure l is shown at a broken away portion of a turbine hub upon which are mounted a plurality of turbine blades 12 each of which is provided with a blade portion 14 and a root portion 16.
  • a continous' circumferential slot 18 to receive the root portion 16 of the blade 12 and within which the blade is adapted to be held rigidly.
  • the slot 18 is provided with two sets of laterally extending shoulders 20 adapted to engage complementary outwardly extending shoulders 22 formed on the root portion 16 of the blades 12.
  • a pair of spring members 24 formed at the base of the root section 16 and adapted to press against the bottom of the slot 18 at a central accurately machined path 26.
  • the spring fingers 24 are formed by an aperture 28 preferably bored close to the bottom of the root 16 and a slot 30 cut through the wall thus formed to the aperture 28.
  • Turbine rotor construction comprising a hub portion having a continuous peripheral slot of substantially uniform cross section and extending radially inward, 'a blade having a root portion extending inwardly into said slot, said root portion having lateral oppositely extending shoulders rigid with respect to each other and intermediate the ends of said root portion, complementary shoulders in said slot having faces for engagement with and overhanging the first said shoulders, and a spring for maintaining such engagement including a pair of resilient members at the end of said root portion and pressing against the bottom of said slot, said resilient members being formed integrally with said root portion, said lateral shoulders of said root portion engaging the radially inner faces of said overhanging complementary shoulders of said slot, and that part of said root portion including said resilient members from said engaging faces of said lateral shoulders radially inward to the end of said root portion being of greater radial length than the portion of said slot radially inward from the corresponding said engaging faces of said complementary shoulders radially inward to the bottom of said slot where said resilient members press as aforesaid.
  • Turbine rotor construction comprising a hub portion having a continuous peripheral slot of substantially uniform cross section and extending radially inward, a blade having a root portion extending inwardly into said slot,
  • root portion having lateral oppositely extending shoulders rigid with respect to each other and intermediate the ends of said root portion, complementary shoulders in said slot having faces for engagement with and overhanging the first said shoulders, and a pair of fingers formed integrally with and at the radially inward end of the root portion extending toward each other and adapted to be sprung by pressure against the bottom of said slot, said lateral shoulders of said root portion engaging the radially inner faces of said overhanging complementary shoulders of said slot, and that part of said root portion including said fingers from said engaging faces of said lateral shoulders radially inward to the end of said root portion being of greater radial length than the portion of said slot radially inward from the corresponding said engaging faces of said complementary shoulders radially inward to the bottom of said slot where said fingers press as aforesaid.

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

Description

Oct. 15,19 7
E. c. CURRY TURBINE ROTOR cous'mucuou Filed April 18-. 1952 HIS ATTORNEY United States Patent TINE ROTOR CONSTRUCTION Application April 18, 1952, Serial No. 283,100
2 Claims. (Cl. 253-77) This invention relates to turbine rotor construction and more particularly to that type of turbine rotor which is provided with a hub and blading formed separately and adapted to be attached thereto.
It is an object of the invention to provide a form of binding and hub which is easily manufactured and assembled.
Another object of the invention is to providea form of blade root which will properly support the blade upon the hub.
Other objects and advantages of the invention will be in part referred to and in part evident from the following description.
In the drawing in which similar parts are designated by similar reference characters,
Figure 1 shows a fragment of a turbine hub shown in side elevation and partly in central section indicating the method of which the turbine blades are held in place therein according to a preferred embodiment of the invention,
Fig. 2 is a transverse axial section across aportion of the hub and blading shown in Figure 1, showing more particularly the blade root section,
Fig. 3 is a bottom view of the root portion of the blade, the profile of the blade portion being indicated in broken lines;
Fig. 4 is a perspective view of the blade root and a portion of the blade portion proper; and
' Figure 5 is an enlarged scale view in longitudinal section of the lower end of the blade root showing more particularly the resilient finger construction.
In Figure l is shown at a broken away portion of a turbine hub upon which are mounted a plurality of turbine blades 12 each of which is provided with a blade portion 14 and a root portion 16. In the periphery of the hub 10 is formed a continous' circumferential slot 18 to receive the root portion 16 of the blade 12 and within which the blade is adapted to be held rigidly. For this purpose the slot 18 is provided with two sets of laterally extending shoulders 20 adapted to engage complementary outwardly extending shoulders 22 formed on the root portion 16 of the blades 12.
As the blades 12 lie in position in the slot 18 it is desired that they should be held as rigidly as possible with the faces of the shoulders 20 pressing against the faces of the shoulders 22. To this end there is provided a pair of spring members 24 formed at the base of the root section 16 and adapted to press against the bottom of the slot 18 at a central accurately machined path 26. The spring fingers 24 are formed by an aperture 28 preferably bored close to the bottom of the root 16 and a slot 30 cut through the wall thus formed to the aperture 28.
As the blades are pressed with considerable force into the slot 18 in the usual well known manner the spring fingers 24 are flexed to provide pressure tending to force Patented Oct. 15, 1957 the blade 12 radially outward forcibly keeping the I applied inwardly on the blade 12 its motion in the slot is limited.
I claim:
1. Turbine rotor construction comprising a hub portion having a continuous peripheral slot of substantially uniform cross section and extending radially inward, 'a blade having a root portion extending inwardly into said slot, said root portion having lateral oppositely extending shoulders rigid with respect to each other and intermediate the ends of said root portion, complementary shoulders in said slot having faces for engagement with and overhanging the first said shoulders, and a spring for maintaining such engagement including a pair of resilient members at the end of said root portion and pressing against the bottom of said slot, said resilient members being formed integrally with said root portion, said lateral shoulders of said root portion engaging the radially inner faces of said overhanging complementary shoulders of said slot, and that part of said root portion including said resilient members from said engaging faces of said lateral shoulders radially inward to the end of said root portion being of greater radial length than the portion of said slot radially inward from the corresponding said engaging faces of said complementary shoulders radially inward to the bottom of said slot where said resilient members press as aforesaid.
2. Turbine rotor construction comprising a hub portion having a continuous peripheral slot of substantially uniform cross section and extending radially inward, a blade having a root portion extending inwardly into said slot,
,said root portion having lateral oppositely extending shoulders rigid with respect to each other and intermediate the ends of said root portion, complementary shoulders in said slot having faces for engagement with and overhanging the first said shoulders, and a pair of fingers formed integrally with and at the radially inward end of the root portion extending toward each other and adapted to be sprung by pressure against the bottom of said slot, said lateral shoulders of said root portion engaging the radially inner faces of said overhanging complementary shoulders of said slot, and that part of said root portion including said fingers from said engaging faces of said lateral shoulders radially inward to the end of said root portion being of greater radial length than the portion of said slot radially inward from the corresponding said engaging faces of said complementary shoulders radially inward to the bottom of said slot where said fingers press as aforesaid.
References Cited in the file of this patent UNITED STATES PATENTS
US283100A 1952-04-18 1952-04-18 Turbine rotor construction Expired - Lifetime US2809801A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3172641A (en) * 1962-11-23 1965-03-09 Allis Chalmers Mfg Co Casing construction
US4618315A (en) * 1981-05-29 1986-10-21 Papst-Motoren Gmbh & Co. Small fan
US4645425A (en) * 1984-12-19 1987-02-24 United Technologies Corporation Turbine or compressor blade mounting
EP1130217A1 (en) * 2000-03-01 2001-09-05 ABB Alstom Power N.V. Fixing of blades in a turbomachine
GB2442968A (en) * 2006-10-20 2008-04-23 Rolls Royce Plc Turbomachine rotor and rotor blade mounting thereon
US20110110785A1 (en) * 2009-11-10 2011-05-12 Alstom Technology Ltd Rotor for an axial-throughflow turbomachine and moving blade for such a rotor
WO2014186028A1 (en) 2013-05-17 2014-11-20 United Technologies Corporation Tangential blade root neck conic
US20170284209A1 (en) * 2014-11-12 2017-10-05 Mitsubishi Hitachi Power Systems, Ltd. Turbine rotor assembly, turbine, and rotor blade
EP3382154A1 (en) * 2017-03-31 2018-10-03 Doosan Heavy Industries & Construction Co., Ltd. Rotating unit and steam turbine including the same

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US952317A (en) * 1909-12-10 1910-03-15 Wilhelm Heinrich Eyermann Means for securing turbine-blades.
US1638648A (en) * 1923-08-13 1927-08-09 Westinghouser Electric And Mfg Turbine-blade fastening
US1891948A (en) * 1931-10-02 1932-12-27 Gen Electric Elastic fluid turbine
US2410588A (en) * 1942-06-23 1946-11-05 Northrop Aircraft Inc Turbine blade and assembly thereof
US2422193A (en) * 1944-06-12 1947-06-17 Westinghouse Electric Corp Method of making cast turbine blading
GB609446A (en) * 1946-03-14 1948-09-30 Parsons C A & Co Ltd Improvements in or relating to the rotors of gas turbines or the like
FR942236A (en) * 1946-03-14 1949-02-02 Parsons C A & Co Ltd Improvements made or relating to rotors of gas turbines or the like

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US952317A (en) * 1909-12-10 1910-03-15 Wilhelm Heinrich Eyermann Means for securing turbine-blades.
US1638648A (en) * 1923-08-13 1927-08-09 Westinghouser Electric And Mfg Turbine-blade fastening
US1891948A (en) * 1931-10-02 1932-12-27 Gen Electric Elastic fluid turbine
US2410588A (en) * 1942-06-23 1946-11-05 Northrop Aircraft Inc Turbine blade and assembly thereof
US2422193A (en) * 1944-06-12 1947-06-17 Westinghouse Electric Corp Method of making cast turbine blading
GB609446A (en) * 1946-03-14 1948-09-30 Parsons C A & Co Ltd Improvements in or relating to the rotors of gas turbines or the like
FR942236A (en) * 1946-03-14 1949-02-02 Parsons C A & Co Ltd Improvements made or relating to rotors of gas turbines or the like

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3172641A (en) * 1962-11-23 1965-03-09 Allis Chalmers Mfg Co Casing construction
US4618315A (en) * 1981-05-29 1986-10-21 Papst-Motoren Gmbh & Co. Small fan
US4645425A (en) * 1984-12-19 1987-02-24 United Technologies Corporation Turbine or compressor blade mounting
EP1130217A1 (en) * 2000-03-01 2001-09-05 ABB Alstom Power N.V. Fixing of blades in a turbomachine
GB2442968A (en) * 2006-10-20 2008-04-23 Rolls Royce Plc Turbomachine rotor and rotor blade mounting thereon
US20080095632A1 (en) * 2006-10-20 2008-04-24 Rolls-Royce Plc. Turbomachine rotor blade and a turbomachine rotor
GB2442968B (en) * 2006-10-20 2009-08-19 Rolls Royce Plc A turbomachine rotor blade and a turbomachine rotor
US7874806B2 (en) 2006-10-20 2011-01-25 Rolls-Royce Plc Turbomachine rotor blade and a turbomachine rotor
US20110110785A1 (en) * 2009-11-10 2011-05-12 Alstom Technology Ltd Rotor for an axial-throughflow turbomachine and moving blade for such a rotor
US8770938B2 (en) * 2009-11-10 2014-07-08 Alstom Technology Ltd Rotor for an axial-throughflow turbomachine and moving blade for such a rotor
WO2014186028A1 (en) 2013-05-17 2014-11-20 United Technologies Corporation Tangential blade root neck conic
EP2997230A4 (en) * 2013-05-17 2017-01-04 United Technologies Corporation Tangential blade root neck conic
US10982555B2 (en) 2013-05-17 2021-04-20 Raytheon Technologies Corporation Tangential blade root neck conic
US20170284209A1 (en) * 2014-11-12 2017-10-05 Mitsubishi Hitachi Power Systems, Ltd. Turbine rotor assembly, turbine, and rotor blade
US10557355B2 (en) * 2014-11-12 2020-02-11 Mitsubishi Hitachi Power Systems, Ltd. Turbine rotor assembly, turbine, and rotor blade
EP3382154A1 (en) * 2017-03-31 2018-10-03 Doosan Heavy Industries & Construction Co., Ltd. Rotating unit and steam turbine including the same
US10871076B2 (en) 2017-03-31 2020-12-22 DOOSAN Heavy Industries Construction Co., LTD Rotating unit and steam turbine including the same

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