US20080206043A1 - Rotor for a turbomachine - Google Patents
Rotor for a turbomachine Download PDFInfo
- Publication number
- US20080206043A1 US20080206043A1 US11/893,079 US89307907A US2008206043A1 US 20080206043 A1 US20080206043 A1 US 20080206043A1 US 89307907 A US89307907 A US 89307907A US 2008206043 A1 US2008206043 A1 US 2008206043A1
- Authority
- US
- United States
- Prior art keywords
- rotor
- housing
- oscillating arm
- track surface
- turbomachine
- 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.)
- Abandoned
Links
Images
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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/14—Suppression of vibrations in rotating systems by making use of members moving with the system using masses freely rotating with the system, i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers
- F16F15/1407—Suppression of vibrations in rotating systems by making use of members moving with the system using masses freely rotating with the system, i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers the rotation being limited with respect to the driving means
- F16F15/145—Masses mounted with play with respect to driving means thus enabling free movement over a limited range
-
- 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
- F01D25/04—Antivibration arrangements
-
- 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
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/10—Anti- vibration means
-
- 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
- F01D5/12—Blades
- F01D5/26—Antivibration means not restricted to blade form or construction or to blade-to-blade connections or to the use of particular materials
Definitions
- the invention refers to a rotor for a turbomachine, wherein the rotor has a vibration reduction device, which is formed in such a way that it damps vibrations of the rotor which emerge during operation of the turbomachine.
- the shafts of generators as a rule are rotationally connected to drive units, like, for example, steam turbines or gas turbines.
- the frequency of generator shafts lies at 50 or 60 Hertz, as the case may be.
- the generator shaft trains experience rotational vibration excitations via the generator.
- the rotor train vibrations and the amplitudes which occur in the process are potentially very detrimental for the rotor shaft and also for the turbine blades which are connected to it, if the amplitudes which occur exceed defined values.
- the object is achieved by means of a rotor for a turbomachine, wherein the rotor has a vibration reduction device which is formed in such a way that it damps vibrations of the rotor which emerge during operation of the turbomachine.
- the vibration reduction device in this case has a housing, wherein a track surface is formed inside the housing, wherein the vibration reduction device comprises a rolling body in the housing, which rolling body is arranged with capability of movement on the track surface.
- the invention is based on the aspect that a vibration reduction device can be simply and quickly attached on a rotor surface.
- the vibration reduction device in this case is formed with a rolling body which counteracts a vibration of the rotor surface. The counteraction is achieved by the presence of inertia of the rolling body.
- the rolling body in a preferred embodiment is a ball or a cylinder. Especially these embodiments are simple in production, as a result of which the vibration reduction device is favorable and inexpensive.
- the track surface is preferably curved, as a result of which different frequencies of the vibration reduction device can be established.
- the track surface is preferably convexly curved with regard to the rotational axis of the rotor.
- the vibration reduction device has a pendulum, wherein the pendulum has an oscillating mass which is arranged on an oscillating arm, wherein the oscillating arm is arranged with capability of rotation.
- the oscillating arm in this case is mounted with capability of rotation around a point of rotation.
- FIG. 1 shows a sectional view of a rotor with a vibration reduction device
- FIG. 2 shows a sectional view of a rotor with all alternative vibration reduction device.
- FIG. 1 a sectional view of a rotor 1 with a vibration reduction device 2 is shown.
- the vibration reduction device 2 has a housing 3 and is formed in such a way that it damps vibrations of the rotor 1 which emerge during operation of the turbomachine.
- the rotor 1 can be arranged in a turbomachine which is not shown in detail.
- a track surface 4 is formed inside the housing 3 , wherein the vibration reduction device 2 comprises a rolling body 5 in the housing 3 , which rolling body is arranged with capability of movement on the track surface 4 .
- a centrifugal force acts in the radial direction 6 and, in a manner of speaking, presses the rolling body 5 against the track surface 4 .
- the rolling body 5 With a constant rotational speed, the rolling body 5 is in a neutral position and does not change its position with regard to the track surface 4 . If, however, the rotational speed of the rotor 1 is not constant, but is superposed by a harmonic disturbing function, this leads to an excitation of the rolling body 5 which ultimately leads to a movement on the track surface 4 .
- a movement of the rotor in one rotational direction 7 brings about a movement in the opposite direction 8 .
- the rolling body 5 in this case is formed either as a ball or as a cylinder.
- the track surface 4 is formed in a curved manner, so that the rolling body 5 experiences a restoring force in the direction of the neutral position 9 .
- the inclination of the track surface 4 has an influence on the restoring force on the rolling body 5 .
- the damping of the rolling body 5 is augmented by a fluid, like, for example, oil or a tribological fluid, being located in the housing 3 of the vibration reduction device 2 .
- the housing 3 can be screwed onto a basic body 10 which is arranged on the rotor 1 .
- the track surface 4 can be formed in a curved manner with regard to the rotational axis 11 of the rotor.
- the vibration reduction device 2 has a pendulum 12 .
- the vibration reduction device 2 is formed in such a way that it damps vibrations of the rotor 1 which emerge during operation of the turbomachine.
- the pendulum 12 has an oscillating mass 14 which is arranged on an oscillating arm 13 , wherein the oscillating arm 13 is arranged with capability of rotation.
- the oscillating arm 13 in this case is arranged with capability of rotation around a point of rotation 15 or around an axis of oscillation 16 .
- the oscillating arm is arranged on an element 17 .
- the oscillating arm 13 furthermore comprises a rolling body 18 which is arranged on one end of the oscillating arm 13 .
- This rolling body 18 is movable along a track, wherein the track can be formed in a convexly curved manner with regard to the rotational axis of the rotor 1 .
Abstract
The invention refers to a rotor for a turbomachine, wherein the rotor has a vibration reduction device which is formed in such a way that it damps vibrations of the rotor which emerge during operation of the turbomachine. The damping is achieved by means of a rolling body inside the vibration reduction device, wherein the rolling body is arranged with capability of movement along a track surface.
Description
- This application claims the benefits of European application No. 06017046.1 filed Aug. 16, 2006, both of the applications are incorporated by reference herein in their entirety.
- The invention refers to a rotor for a turbomachine, wherein the rotor has a vibration reduction device, which is formed in such a way that it damps vibrations of the rotor which emerge during operation of the turbomachine.
- The shafts of generators as a rule are rotationally connected to drive units, like, for example, steam turbines or gas turbines. The frequency of generator shafts lies at 50 or 60 Hertz, as the case may be. However, the generator shaft trains experience rotational vibration excitations via the generator. As a rule, it is considered that with four-pole and two-pole generators of heavy machine construction which are operated at, or at half of, the system frequency, as the case may be, double the electrical supply frequency always emerges as exciting frequency. The rotor train vibrations and the amplitudes which occur in the process are potentially very detrimental for the rotor shaft and also for the turbine blades which are connected to it, if the amplitudes which occur exceed defined values.
- In order to avoid rotor vibrations with too large amplitudes, these are modulated by means of masses and/or torsional rigidity distributions along the rotor. This means that the shafts are formed in such a way that masses are attached or removed at accessible points. However, not all vibrations can be avoided by means of these measures.
- Therefore, it is an object of the invention to provide a rotor in which disturbing vibrations can be effectively minimized.
- The object is achieved by means of a rotor for a turbomachine, wherein the rotor has a vibration reduction device which is formed in such a way that it damps vibrations of the rotor which emerge during operation of the turbomachine.
- The vibration reduction device in this case has a housing, wherein a track surface is formed inside the housing, wherein the vibration reduction device comprises a rolling body in the housing, which rolling body is arranged with capability of movement on the track surface. The invention is based on the aspect that a vibration reduction device can be simply and quickly attached on a rotor surface. The vibration reduction device in this case is formed with a rolling body which counteracts a vibration of the rotor surface. The counteraction is achieved by the presence of inertia of the rolling body.
- The rolling body in a preferred embodiment is a ball or a cylinder. Especially these embodiments are simple in production, as a result of which the vibration reduction device is favorable and inexpensive.
- The track surface is preferably curved, as a result of which different frequencies of the vibration reduction device can be established.
- The track surface is preferably convexly curved with regard to the rotational axis of the rotor.
- A fluid is advantageously contained in the housing, as a result of which the damping of the rolling body is increased. In a preferred embodiment, the vibration reduction device has a pendulum, wherein the pendulum has an oscillating mass which is arranged on an oscillating arm, wherein the oscillating arm is arranged with capability of rotation.
- The oscillating arm in this case is mounted with capability of rotation around a point of rotation.
- Exemplary embodiments of the invention are explained in more detail with reference to the drawing. Components which function in the same way have the same designations.
- In the drawing:
-
FIG. 1 shows a sectional view of a rotor with a vibration reduction device -
FIG. 2 shows a sectional view of a rotor with all alternative vibration reduction device. - In
FIG. 1 , a sectional view of a rotor 1 with avibration reduction device 2 is shown. Thevibration reduction device 2 has ahousing 3 and is formed in such a way that it damps vibrations of the rotor 1 which emerge during operation of the turbomachine. The rotor 1 can be arranged in a turbomachine which is not shown in detail. - A
track surface 4 is formed inside thehousing 3, wherein thevibration reduction device 2 comprises arolling body 5 in thehousing 3, which rolling body is arranged with capability of movement on thetrack surface 4. - During operation, a centrifugal force acts in the radial direction 6 and, in a manner of speaking, presses the
rolling body 5 against thetrack surface 4. With a constant rotational speed, therolling body 5 is in a neutral position and does not change its position with regard to thetrack surface 4. If, however, the rotational speed of the rotor 1 is not constant, but is superposed by a harmonic disturbing function, this leads to an excitation of therolling body 5 which ultimately leads to a movement on thetrack surface 4. On account of inertia, a movement of the rotor in onerotational direction 7 brings about a movement in theopposite direction 8. - The
rolling body 5 in this case is formed either as a ball or as a cylinder. - The
track surface 4 is formed in a curved manner, so that therolling body 5 experiences a restoring force in the direction of the neutral position 9. The inclination of thetrack surface 4 has an influence on the restoring force on therolling body 5. The damping of therolling body 5 is augmented by a fluid, like, for example, oil or a tribological fluid, being located in thehousing 3 of thevibration reduction device 2. - The
housing 3 can be screwed onto abasic body 10 which is arranged on the rotor 1. - The
track surface 4 can be formed in a curved manner with regard to therotational axis 11 of the rotor. - An alternative embodiment of the
vibration reduction device 2 is to be seen inFIG. 2 . Thevibration reduction device 2 has apendulum 12. Thevibration reduction device 2 is formed in such a way that it damps vibrations of the rotor 1 which emerge during operation of the turbomachine. For this, thependulum 12 has anoscillating mass 14 which is arranged on an oscillatingarm 13, wherein the oscillatingarm 13 is arranged with capability of rotation. The oscillatingarm 13 in this case is arranged with capability of rotation around a point of rotation 15 or around an axis of oscillation 16. The oscillating arm is arranged on anelement 17. - In the embodiment of the
vibration reduction device 2 which is shown inFIG. 2 , the oscillatingarm 13 furthermore comprises arolling body 18 which is arranged on one end of the oscillatingarm 13. Thisrolling body 18 is movable along a track, wherein the track can be formed in a convexly curved manner with regard to the rotational axis of the rotor 1.
Claims (13)
1.-12. (canceled)
13. A rotor for a turbomachine having a rotational axis, comprising:
a housing arranged on a surface of the rotor, wherein the housing has an interior portion;
a track surface formed on an interior surface of the housing; and
a body arranged on the track surface where the rolling body damps vibrations of the rotor that emerge during operation of the turbomachine by movement of the body on the track surface.
14. The rotor as claimed in claim 13 , wherein the rolling body is a ball.
15. The rotor as claimed in claim 13 , wherein the rolling body is a cylinder.
16. The rotor as claimed in claim 13 , wherein the track surface is curved.
17. The rotor as claimed in claim 13 , wherein the track surface is convexly curved relative to the rotational axis of the rotor.
18. The rotor as claimed in claim 17 , wherein the housing contains a fluid.
19. A rotor for a turbomachine having a rotational axis, comprising:
a housing arranged on a surface of the rotor, wherein the housing has an interior portion;
a support element contained within the interior portion of the housing;
an oscillating arm attached to the support element; and
an oscillating mass attached at an end of the oscillating arm, wherein the oscillating arm and mass are formed in a pendulum like manner.
20. The rotor as claimed in claim 19 , wherein the oscillating arm is arranged to provide rotation of the oscillating arm around a point of rotation.
21. The rotor as claimed in claim 19 , wherein the oscillating arm is arranged to provide rotation of the oscillating arm around an axis of rotation.
22. A rotor for a turbomachine having a rotational axis, comprising:
a housing arranged on a surface of the rotor, wherein the housing has an interior portion;
a track surface formed on an interior surface of the housing;
a support element contained within the interior portion of the housing;
an oscillating arm attached to the support element;
an oscillating mass attached at an end of the oscillating arm, wherein the oscillating arm and mass are formed in a pendulum like manner; and
a body arranged on the track surface where the rolling moves along the track surface.
23. The rotor as claimed in claim 22 , wherein the track is convexly curved relative to the rotational axis of the rotor.
24. The rotor as claimed in claim 22 , wherein the oscillating arm is pivotably to the support element.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06017046.1A EP1892379B1 (en) | 2006-08-16 | 2006-08-16 | Rotor for a turbomachine |
EP06017046.1 | 2006-08-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080206043A1 true US20080206043A1 (en) | 2008-08-28 |
Family
ID=37834175
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/893,079 Abandoned US20080206043A1 (en) | 2006-08-16 | 2007-08-14 | Rotor for a turbomachine |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080206043A1 (en) |
EP (1) | EP1892379B1 (en) |
JP (1) | JP2008045747A (en) |
CN (1) | CN101126323A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11466570B2 (en) | 2018-09-26 | 2022-10-11 | Mitsubishi Heavy Industries Aero Engines, Ltd. | Rotor assembly and rotating machine |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3016659B1 (en) * | 2014-01-20 | 2016-03-04 | Snecma | MOBILE TURBOMACHINE ORGAN WHICH HAS MEANS FOR CHANGING ITS RESONANCE FREQUENCY |
FR3084912B1 (en) * | 2018-08-07 | 2020-07-03 | Safran Aircraft Engines | STRESS REDUCTION DEVICE FOR A TURBOMACHINE SHAFT |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1856786A (en) * | 1931-10-16 | 1932-05-03 | Gen Electric | Bucket wheel and like rotating member |
US2349187A (en) * | 1941-03-08 | 1944-05-16 | Westinghouse Electric & Mfg Co | Vibration dampener |
US5639214A (en) * | 1995-04-27 | 1997-06-17 | Eurocopter France | Vibration damping apparatus for helicopter rotor |
US5845542A (en) * | 1992-05-21 | 1998-12-08 | Eti Technologies Inc. | Dynamic balancing method and apparatus |
US5941133A (en) * | 1996-04-19 | 1999-08-24 | Eti Technologies Inc. | Torsional and translational vibration removing device |
US6520047B2 (en) * | 1999-03-16 | 2003-02-18 | Mannesmann Sachs Ag | Vibration damping device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5924845A (en) * | 1997-04-07 | 1999-07-20 | The United States Of America As Represented By The Secretary Of The Air Force | Centrifugal pendulum absorber for engine blades |
JP2003014089A (en) * | 2001-06-28 | 2003-01-15 | Toyota Industries Corp | Rotation body and compressor |
DE10202995B4 (en) * | 2002-01-26 | 2004-01-29 | Nordex Energy Gmbh | Rotor blade for a wind turbine with a damper device |
-
2006
- 2006-08-16 EP EP06017046.1A patent/EP1892379B1/en not_active Not-in-force
-
2007
- 2007-08-09 JP JP2007208084A patent/JP2008045747A/en not_active Withdrawn
- 2007-08-14 US US11/893,079 patent/US20080206043A1/en not_active Abandoned
- 2007-08-16 CN CNA200710141022XA patent/CN101126323A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1856786A (en) * | 1931-10-16 | 1932-05-03 | Gen Electric | Bucket wheel and like rotating member |
US2349187A (en) * | 1941-03-08 | 1944-05-16 | Westinghouse Electric & Mfg Co | Vibration dampener |
US5845542A (en) * | 1992-05-21 | 1998-12-08 | Eti Technologies Inc. | Dynamic balancing method and apparatus |
US5639214A (en) * | 1995-04-27 | 1997-06-17 | Eurocopter France | Vibration damping apparatus for helicopter rotor |
US5941133A (en) * | 1996-04-19 | 1999-08-24 | Eti Technologies Inc. | Torsional and translational vibration removing device |
US6520047B2 (en) * | 1999-03-16 | 2003-02-18 | Mannesmann Sachs Ag | Vibration damping device |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11466570B2 (en) | 2018-09-26 | 2022-10-11 | Mitsubishi Heavy Industries Aero Engines, Ltd. | Rotor assembly and rotating machine |
Also Published As
Publication number | Publication date |
---|---|
EP1892379A1 (en) | 2008-02-27 |
EP1892379B1 (en) | 2015-11-18 |
CN101126323A (en) | 2008-02-20 |
JP2008045747A (en) | 2008-02-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SIEMENS AKTIENGESELLSCHAFT, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RICHTER, CHRISTOPH;REEL/FRAME:019741/0310 Effective date: 20070715 Owner name: SIEMENS AKTIENGESELLSCHAFT,GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RICHTER, CHRISTOPH;REEL/FRAME:019741/0310 Effective date: 20070715 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |