EP2414637A2 - Rotor for a turbomachine - Google Patents
Rotor for a turbomachineInfo
- Publication number
- EP2414637A2 EP2414637A2 EP10715754A EP10715754A EP2414637A2 EP 2414637 A2 EP2414637 A2 EP 2414637A2 EP 10715754 A EP10715754 A EP 10715754A EP 10715754 A EP10715754 A EP 10715754A EP 2414637 A2 EP2414637 A2 EP 2414637A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- rotor
- longitudinal bearing
- bearing disc
- contact surface
- 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.)
- Withdrawn
Links
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
- 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
- F01D5/06—Rotors for more than one axial stage, e.g. of drum or multiple disc type; Details thereof, e.g. shafts, shaft connections
- F01D5/066—Connecting means for joining rotor-discs or rotor-elements together, e.g. by a central bolt, by clamps
-
- 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
- F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
- F01D25/166—Sliding contact bearing
- F01D25/168—Sliding contact bearing for axial load mainly
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0459—Details of the magnetic circuit
- F16C32/0468—Details of the magnetic circuit of moving parts of the magnetic circuit, e.g. of the rotor
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
- F16D1/0876—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with axial keys and no other radial clamping
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0474—Active magnetic bearings for rotary movement
- F16C32/0476—Active magnetic bearings for rotary movement with active support of one degree of freedom, e.g. axial magnetic bearings
Definitions
- the invention relates to a rotor for a turbomachine with a shaft and arranged thereon
- Longitudinal bearing disc as an element for a thrust bearing for axial bearing of the shaft.
- turbomachine such as a gas or steam turbine or a turbocompressor
- working members are arranged, for example, in the form of paddle wheels, by which a stationary pressure difference between an inlet and outlet of the turbomachine is built up or broken down.
- the thrust bearing comprises a longitudinal bearing disc, which is part of the rotor, and bearing elements on the stator, on which the longitudinal bearing disc - supported by magnetic forces or by oil-guided sliding - depending on the type of bearing.
- turbomachine in particular in the industrial sector, is in contact with aggressive gases, for example when compressing gases containing hydrogen sulphide, the working elements and also the longitudinal bearing disk become chemically attacked, so that their strength is impaired.
- aggressive gases for example when compressing gases containing hydrogen sulphide
- steels that are not corroded by hydrogen sulphide have a maximum strength of only 700 N / mm 2 .
- turbomachines that communicate with hydrogen sulphide or similar aggressive gases can only be operated at lower speeds than machines that are not designed to handle such aggressive chemical gases.
- a rotor of the type mentioned in which the longitudinal bearing disc according to the invention has a first, cylindrical contact surface for radial mounting on the shaft and a second, conical contact surface for self-centering on the shaft.
- the invention is based on the consideration that longitudinal bearing discs are mounted in the known embodiment by means of a hydraulic shrinkage bandage on the shaft of the rotor.
- the longitudinal bearing plate is hydraulically expanded and pushed onto a slightly conical contact surface of the shaft against a stop.
- a shaft nut holds the shrunk longitudinal bearing disc axially in position. So that the longitudinal bearing disc does not slip on the contact surface of the shaft, it must also be strong
- the longitudinal bearing disc By the first, cylindrical contact surface, the longitudinal bearing disc can be held radially in position and thus an imbalance can be avoided.
- the contact surface serves to transmit the tangential forces from the longitudinal bearing disk to the shaft so that it does not rotate relative to the shaft.
- the longitudinal bearing disk is expediently pressed by a shaft nut with its conical contact surface against a counter surface of the shaft or of a component fastened to it.
- the turbomachine is advantageously a turbomachine, in particular a turbocompressor.
- the invention is particularly advantageous to such
- Longitudinal washer applicable which is part of a magnetic bearing. Due to the magnetic bearing, the longitudinal bearing disk is made relatively large and thus heavily loaded mechanically at high revolutions. Due to the magnetic bearing a particularly low-friction storage can be achieved.
- the conical contact surface serves to self-center the longitudinal bearing disc on the shaft.
- the conical bearing surface does not directly adjoin the first, cylindrical abutment surface, in order to avoid a sharp edge which causes the shaft to slip when pushed on
- the two contact surfaces are expediently spaced from each other, for example by a flat intermediate surface, such as a chamfer, or may be connected by a rounding.
- the second contact surface rebound conical to the radial compression of the longitudinal bearing disc is the second contact surface rebound conical to the radial compression of the longitudinal bearing disc.
- the conical bearing surface and its counter surface can be designed as a Hirth connection.
- this embodiment has the disadvantage that it is associated with a high production cost. It is therefore a conical shape in the form of a frustoconical surface is preferred in which a force transmission from the contact surface to the mating surface by a frictional connection, ie by static friction.
- the force with which the longitudinal bearing disc is pressed at its conical contact surface against the counter surface is chosen to be so large that the resulting force on the contact surface by friction moments can transmit the necessary starting moments without sliding the second contact surface on its counter surface.
- the second contact surface with an angle of inclination to the radial direction of the shaft between 5 ° and
- Inclination angle the forces occurring can be adjusted to the particular case of need.
- the longitudinal bearing disc is mounted so that with increasing speed an increasing bearing force acts on the second bearing surface.
- This can be achieved in particular by the recessed conicity of the second contact surface.
- With increasing speed leads the increasing Radial force to an increasing contact pressure of the second contact surface against its counter surface, whereby the transmittable torque is increased, which is generated by friction effect of the two contact surfaces together.
- a temperature increase of the longitudinal bearing disc leads to an increasing bearing force of the second contact surface.
- a decrease in frictional forces on the contact surfaces can be counteracted thereby.
- the longitudinal bearing disc is mounted stress-free on the shaft with the first contact surface.
- the longitudinal bearing disc can be mechanically protected and thus driven at high speeds. A lack of tension is given if the longitudinal bearing disc can be pushed by hand onto the shaft for supporting the first contact surface on its corresponding counter surface.
- a safe installation of the longitudinal bearing disc and safe operation of the rotor can be achieved when the second
- Abutment surface abuts a conical counter surface, which is incorporated in the shaft.
- the conical counter surface is thus directly part of the shaft, so that a wave ring or a similar component can be omitted.
- the second contact surface is an end face of the bearing disk, wherein an end face is understood to mean a surface having an inclination of less than 45 ° to the radial direction of the shaft.
- an anti-rotation lock is expediently provided which predetermines a fixed tangential position of the longitudinal bearing disc on the shaft.
- the anti-rotation can also during the
- the rotor is equipped with an anti-rotation device, which holds the longitudinal bearing disc by a positive connection in a tangential target position. A change of balancing states after disassembly and reassembly can be avoided.
- the positive connection can be made directly between the longitudinal bearing disc and shaft, for example by a tongue and groove connection in or near the first contact surface.
- a recess of a radially inwardly facing surface of the longitudinal bearing disc By a recess of a radially inwardly facing surface of the longitudinal bearing disc, however, the longitudinal bearing disc is not significantly affected in their strength. It is therefore advantageous if a positive locking element of the anti-rotation device engages in an end face of the longitudinal bearing disk. A recess in the end face leads to a significantly lower mechanical stress on the foot of the
- the end face is arranged opposite the second contact surface.
- the second contact surface can be designed to be free from interferences and entirely based on friction transmission.
- the anti-rotation comprises an anti-rotation ring, which at least indirectly has a positive connection with the longitudinal bearing disc and in the same direction at least indirectly has a positive connection with the shaft.
- a positive power transmission from the longitudinal bearing disc on the anti-rotation ring can be continued in a simple manner in the same direction, for example in the tangential direction to the shaft.
- a Production of the elements can be kept simple, if the two form-fitting are each formed by a positive locking element which engages in the form-fitting connected elements.
- the positive connection between the anti-rotation ring and the shaft is suitably achieved by a feather key which engages in a groove of the anti-rotation ring and the shaft.
- two positive locking elements are expediently provided for each of the two form-fitting.
- the feather key and the interlocking element are expediently arranged tangentially offset from each other, with two interlocking elements and two feather keys, which are advantageously mounted opposite each other, interlocking elements and feather keys are advantageously arranged at an angle of 90 ° to each other.
- the rotor expediently comprises a spring means for cushioning bearing forces on the second contact surface.
- the spring means may receive its spring action through a recess which is compressed in a resilient movement.
- the recess may be on the longitudinal bearing disk or in the component that the mating surface forms the conical contact surface of the longitudinal bearing disk, in particular directly in the shaft.
- FIGURE shows a section of a section of a rotor 2 of a turbomachine in the form of a
- the rotor 2 comprises a shaft 6 extending in the axial direction 4, on which a longitudinal bearing disc 8 is mounted.
- the longitudinal bearing disc 8 is part of a Axial bearings 10, of which two magnetic poles 12 are schematically indicated for better understanding, which support the longitudinal bearing disc 8 in the axial direction 4.
- the thrust bearing 10 is thus a magnetic bearing for holding the shaft 6 in an intended axial position.
- the longitudinal bearing disc 8 is provided with a first, hollow-cylindrical bearing surface 14 which rests on a likewise cylindrical counter-surface 16 of the shaft 6.
- the bearing formed by the contact surface 14 and the mating surface 16 holds the longitudinal bearing disk in the radial direction 18 without play on the shaft 6.
- the longitudinal bearing disk 8 has a first end face 20 and a second end face opposite it, which is designed as a second and conical contact surface 22.
- the contact surface 22 abuts against a counter surface 24, which is incorporated directly into the material of the shaft 6.
- the contact surface 22 is provided with an inclination angle ⁇ of 25 °, wherein the contact surface 22 is designed to spring back, so that the counter surface 24, the longitudinal support disk i in the region of the contact surface 22 a piece far overlaps.
- the longitudinal bearing disc 8 is compressed in an axial bracing of the longitudinal bearing disc 8 and pressed against a centrifugal force on the shaft 8. Due to the conicity of the contact surface 22, a self-centering of the longitudinal bearing disc 8 is effected on the shaft 6, which supports the centering of the longitudinal bearing disc 8 by the systems of the surfaces 14, 16.
- a chamfer 26 is incorporated between the two contact surfaces 14, 22, wherein a rounding between the contact surfaces 14, 22 is useful.
- a cavity 28 in the shaft material leads to a
- a shaft nut 32 which is positively connected by a thread 34 with the shaft 6, is braced for mounting the longitudinal bearing disc 8 against a Verstonêtsring 36 which presses the longitudinal bearing disc with its contact surface 22 against the corresponding counter surface 24.
- a biasing force F v applied by the shaft nut 32 is chosen to be so large that the normal force F N resulting from an axial force F AX and the inclination angle ⁇
- a recess 38 is inserted into the shaft 8.
- the recess surrounds the shaft 6 all around and thus forms a slightly elastic web 40, the pressure of the two contact surfaces 22, 24 to each other on a limited material harmless size.
- a mounting or dismounting of the longitudinal bearing disc 8 can be done in a simple manner by the longitudinal bearing disc 8 is pushed by hand on the shaft 6 or withdrawn from this.
- the longitudinal bearing disc 8 should sit again in its original tangential position on the shaft 6 in a new assembly. To ensure this, between the shaft nut 32 and the longitudinal bearing disc 8 of
- Anti-rotation ring 36 is arranged, which has two positive locking elements 42 in the form of bolts in
- the form-fit elements 42 of which only one is shown for the sake of clarity, the other is offset from the rotation axis 44 of the shaft 6, so they engage in the end face 20 of the longitudinal bearing disk 8, so that the contact surface 14 of the longitudinal bearing disk 8 unimpaired.
- Both the anti-rotation ring 36 and the shaft 6 are provided with a groove 46 and 48, respectively, held in position tangentially to each other via a key 50 made of a rectangular steel. In this way, between the shaft 6 and the longitudinal bearing disc 8 an indirect positive connection is made such that the longitudinal bearing disc 8 is mounted in the tangential direction only in a preset position and remains in this position.
- the feather key 50 is provided in a double version, wherein both feather keys 50 are also arranged with respect to the axis of rotation 44 opposite.
- the feather keys 50 are offset from the interlocking elements 42 in the tangential direction 90 °. They are merely drawn to simplify the figures in the same sectional plane in order to dispense with a further sectional view through the rotor 2 rotated by 90 ° about the rotation axis 44 can.
- the interlocking element 42 and the feather key 50 can be designed as an additional safeguard against a tangential rotation of the longitudinal bearing disk 8 on the shaft 6.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sliding-Contact Bearings (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Rotary Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009015859 | 2009-04-01 | ||
PCT/EP2010/054210 WO2010112509A2 (en) | 2009-04-01 | 2010-03-30 | Rotor for a turbomachine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2414637A2 true EP2414637A2 (en) | 2012-02-08 |
Family
ID=42828758
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10715754A Withdrawn EP2414637A2 (en) | 2009-04-01 | 2010-03-30 | Rotor for a turbomachine |
Country Status (6)
Country | Link |
---|---|
US (1) | US20120014790A1 (en) |
EP (1) | EP2414637A2 (en) |
CN (1) | CN102449267A (en) |
BR (1) | BRPI1009988A2 (en) |
RU (1) | RU2482336C1 (en) |
WO (1) | WO2010112509A2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2931874B1 (en) * | 2008-05-29 | 2010-06-25 | Snecma | AXIAL BLOCKING DEVICE FOR TREE GUIDE BEARING IN TURBOMACHINE. |
US20140064976A1 (en) * | 2012-08-14 | 2014-03-06 | Kevin L. Corcoran | Rotor keyhole fillet for a gas turbine engine |
FI127781B (en) * | 2015-01-21 | 2019-02-15 | Lappeenrannan Teknillinen Yliopisto | A rotor assembly for an axial magnetic bearing |
CN107030244B (en) * | 2017-04-18 | 2018-08-31 | 中国科学院工程热物理研究所 | A kind of tool structure for the assembly of rotor feather joint lock pin |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE499929C (en) * | 1930-06-14 | Bbc Brown Boveri & Cie | Fastening of disks on shaft passing through the hub |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE49929C (en) * | J. SCHMITZ in Scheuburg bei Rheydt | Device for recycling the exhaust gases from steam boilers | ||
SU1642078A1 (en) * | 1989-04-25 | 1991-04-15 | Сумское Машиностроительное Научно-Производственное Объединение Им.М.В.Фрунзе | Turbo-machine rotor |
FR2724974B1 (en) * | 1994-09-23 | 1996-11-22 | Framatome Sa | ROTARY AXIAL PUSH MACHINE |
US6059486A (en) * | 1998-06-03 | 2000-05-09 | Pratt & Whitney Canada Inc. | Flat key washer |
US6057619A (en) * | 1998-12-22 | 2000-05-02 | Sundstrand Corporation | Stress relief in a magnetic thrust bearing |
US6499969B1 (en) * | 2000-05-10 | 2002-12-31 | General Motors Corporation | Conically jointed turbocharger rotor |
EP1577493A1 (en) * | 2004-03-17 | 2005-09-21 | Siemens Aktiengesellschaft | Turbomachine and rotor for a turbomachine |
CN100582489C (en) * | 2004-06-29 | 2010-01-20 | 英格索尔-兰德公司 | Device and method for detachably connecting an impeller to a shaft |
RU2276287C1 (en) * | 2005-03-16 | 2006-05-10 | Владимир Дмитриевич Анохин | Multistage centrifugal pump |
CN200943509Y (en) * | 2006-07-26 | 2007-09-05 | 沈阳黎明航空发动机(集团)有限责任公司 | Radially pin-joined turbine disc |
-
2010
- 2010-03-30 BR BRPI1009988A patent/BRPI1009988A2/en not_active IP Right Cessation
- 2010-03-30 US US13/260,993 patent/US20120014790A1/en not_active Abandoned
- 2010-03-30 EP EP10715754A patent/EP2414637A2/en not_active Withdrawn
- 2010-03-30 RU RU2011144023/06A patent/RU2482336C1/en not_active IP Right Cessation
- 2010-03-30 CN CN2010800241760A patent/CN102449267A/en active Pending
- 2010-03-30 WO PCT/EP2010/054210 patent/WO2010112509A2/en active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE499929C (en) * | 1930-06-14 | Bbc Brown Boveri & Cie | Fastening of disks on shaft passing through the hub |
Also Published As
Publication number | Publication date |
---|---|
RU2482336C1 (en) | 2013-05-20 |
RU2011144023A (en) | 2013-05-10 |
WO2010112509A3 (en) | 2011-06-03 |
CN102449267A (en) | 2012-05-09 |
US20120014790A1 (en) | 2012-01-19 |
WO2010112509A2 (en) | 2010-10-07 |
BRPI1009988A2 (en) | 2016-03-15 |
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Legal Events
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DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SIEMENS AKTIENGESELLSCHAFT |
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Effective date: 20141113 |
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17Q | First examination report despatched |
Effective date: 20141202 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20150414 |