EP3640433A1 - Dispositif de régulation pour une turbine à vapeur ainsi que procédé de fabrication d'un dispositif de régulation - Google Patents

Dispositif de régulation pour une turbine à vapeur ainsi que procédé de fabrication d'un dispositif de régulation Download PDF

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Publication number
EP3640433A1
EP3640433A1 EP19200724.3A EP19200724A EP3640433A1 EP 3640433 A1 EP3640433 A1 EP 3640433A1 EP 19200724 A EP19200724 A EP 19200724A EP 3640433 A1 EP3640433 A1 EP 3640433A1
Authority
EP
European Patent Office
Prior art keywords
control wheel
wheel arrangement
turbine
turbine shaft
arrangement
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Withdrawn
Application number
EP19200724.3A
Other languages
German (de)
English (en)
Inventor
Stefan PREIBISCH
Matthias SCHÖNEICH
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens 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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP3640433A1 publication Critical patent/EP3640433A1/fr
Withdrawn legal-status Critical Current

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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
    • F01D5/12—Blades
    • F01D5/22—Blade-to-blade connections, e.g. for damping vibrations
    • F01D5/225—Blade-to-blade connections, e.g. for damping vibrations by shrouding
    • 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
    • F01D5/34—Rotor-blade aggregates of unitary construction, e.g. formed of sheet laminae
    • 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
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/31—Application in turbines in steam turbines
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/10—Manufacture by removing material

Definitions

  • the invention relates to a control wheel arrangement for a steam turbine according to the preamble of independent patent claim 1. Furthermore, the invention relates to a method for producing a control wheel arrangement according to independent patent claims 5 and 6.
  • a steam turbine usually consists of several turbine stages, each of which is composed of a ring of guide vanes and rotor blades. The blades are attached to the rotor.
  • the guide vanes are arranged on the inside of the housing or on a special guide vane carrier.
  • the turbine power is regulated by regulating the amount of steam supplied by means of control valves.
  • a control wheel arrangement is connected upstream of the first turbine stage.
  • the control wheel arrangement is a special constant pressure stage.
  • the control wheel or the blading of the control wheel arrangement is also referred to as an action wheel or as an A wheel if the impeller is single-ring and as a Curtis wheel if the impeller has two rings.
  • the rotor blades of the impeller, in particular those of the control wheel, of the control stage of a steam turbine are milled from the solid together with the shroud and, if necessary, are additionally provided with damping wires that are calked in at the side for optimum vibration damping in the shroud area.
  • the cover bands of the rotor blades avoid gap losses at the rotor blade tip and thereby increase the efficiency of the steam turbine.
  • the radial gap between the cover band and the steam turbine housing or the guide vane carrier is sealed with a labyrinth in order to minimize the gap losses.
  • the blades of the control wheel are preferably attached to the turbine shaft by means of a foot / groove connection.
  • a foot / groove connection Depending on the mechanical stress, different foot / groove connections are available for attaching the rotor blades to the turbine shaft, such as hammer head, double hammer head, dovetail, fir tree or plug-in feet or T-foot / groove connections.
  • the turbine shaft is provided with grooves with corresponding undercuts, into which adapted feet are inserted on the rotor blades.
  • the blades of the control wheel are exposed to high centrifugal forces due to their function. In order to achieve a high efficiency of the steam turbine, they have the largest possible outflow area. This means that the blades of the control wheel preferably have large blade lengths. At the same time, however, the blades are subject to larger pressure differences, which in turn limit the maximum blade length. High-strength steels are therefore used for common applications. Where these can no longer be used for reasons of centrifugal force, titanium blades are used which, due to their lower density, also experience lower centrifugal forces. However, these blades are considerably more expensive than steel blades and are also limited in terms of their maximum operating temperatures.
  • the currently used foot / groove connections of the control wheel arrangement are overstressed in part. Due to the higher centrifugal forces and the increased steam forces, the stresses in the foot / groove connections of the control wheel can often be greater than acceptable.
  • the currently known embodiments of the control wheel are based on a one-piece design of the rotor blades and the shroud, the rotor blades using conventional foot / groove connections such as for example fir tree foot connections, are connected to the turbine shaft.
  • the control wheel forms a closed ring and enables the control wheel to withstand higher loads.
  • Such a design of the control wheel requires a very precise production so that all groove and foot connections mesh cleanly.
  • the formation of the T-shaped grooves is still necessary, which are complex to form individually and represent a weakening of the shaft.
  • the object of the present invention is therefore to provide a control wheel arrangement for a steam turbine which is simple, safe and inexpensive to manufacture and which withstands high steam inlet parameters and high rotation speeds. Furthermore, it is an object of the invention to provide a method for producing such a control wheel arrangement.
  • control wheel arrangement for a steam turbine, comprising a turbine shaft and a control wheel connected in a rotationally fixed manner to the turbine shaft and comprising a plurality of moving blades, is characterized in that the control wheel is formed in one piece with the turbine shaft.
  • the one-piece design of the control wheel and turbine shaft eliminates the otherwise common foot / groove connection. Due to the one-piece design, the shaft / blade connection is no longer limiting the load capacity of the control wheel. Thus, the speed can be increased significantly, whereby the performance of the machine driven by the turbine can also be increased. As a result, the machines on a rod (e.g. steam turbine and compressor) are better coordinated and run at their optimum operating point.
  • a rod e.g. steam turbine and compressor
  • control wheel arrangement Due to the integral design of the control wheel with the turbine shaft, an axial securing of the control wheel on the turbine shaft is no longer necessary. Such a control wheel also enables a larger compensating piston to be used on the turbine shaft, since there is no need for complex and space-consuming drilling. Accordingly, the axial bearings on the turbine shaft can advantageously be made smaller due to the lower axial forces.
  • the control wheel arrangement according to the invention has significant cost advantages over the previous control wheel arrangements, since the individual blades no longer have to be manufactured individually and have to be introduced manually into the shaft.
  • An embodiment of the invention provides that the rotor blades of the control wheel are formed by means of a machining production process, in particular milling.
  • the cutting process enables a particularly simple and inexpensive possibility of forming the individual blades in the control wheel.
  • post-processing can be carried out, for example, by grinding, polishing or rolling.
  • control wheel is provided with a shroud which is formed in one piece with the control wheel.
  • the integral design of the control wheel and shroud eliminates the need to retrofit the shroud to the individual blades of the control wheel.
  • the one-piece design ensures a particularly rigid design of the control wheel.
  • the shroud connects the free ends of the blade to one another, thereby stabilizing them against vibrations and sealing them axially.
  • control wheel is provided with a shroud which is connected to the control wheel in a material and / or form-fitting manner.
  • the separate training of control wheel and shroud can. U. easier to manufacture. Due to the lack of a shroud, the blades, in particular, can be formed more easily from the turbine shaft blank by means of a machining production process.
  • the cover band can then be attached in a simple manner by means of a material and / or positive connection to the ends of the rotor blade of the control wheel.
  • the control wheel is formed in one piece with the turbine shaft.
  • the turbine shaft blank has material added, for example in the form of a corresponding shoulder.
  • the individual rotor blades are then machined from this by machining the turbine shaft blank.
  • the machining is carried out in such a way that the blade ends are formed in one piece with the shroud.
  • the control wheel and cover band are therefore an integral part of the turbine shaft.
  • the control wheel can be stressed much more, since the limiting shaft / groove connection is completely eliminated.
  • the control wheel arrangement is therefore suitable for significantly higher speeds as well as for significantly higher steam parameters, as a result of which the overall efficiency of the turbomachine can be increased.
  • the one-piece design of the control wheel with the turbine shaft results in significant cost advantages. Furthermore, the assembly is simplified since the turbine shaft does not have to be individually equipped with the moving blades.
  • the control wheel is again formed in one piece with the turbine shaft.
  • the cover band is subsequently applied by means of a material and / or positive connection, for example by welding or riveting or by additive manufacturing processes, and connects the free ends of the rotor blade to one another, thereby stabilizing them against vibrations and sealing them axially.
  • control wheel arrangement according to the invention and the method according to the invention for producing such a control wheel arrangement create a control wheel arrangement which can withstand significantly higher forces and loads than the known embodiments.
  • the one-piece design of the control wheel with the turbine shaft eliminates the shaft vane connection which was previously limiting.
  • the one-piece training results in cost advantages and assembly advantages.
  • FIG. 1 shows a first embodiment of a control wheel arrangement 1 for a steam turbine in a side view.
  • the control wheel arrangement 1 comprises a turbine shaft 2 and a control wheel 4, which is connected to the turbine shaft 2 in a rotationally fixed manner and comprises a plurality of rotor blades 3.
  • the control wheel 4 is formed in one piece with the turbine shaft 2.
  • the individual blades 3 of the control wheel 4 are produced from a turbine shaft blank by means of a machining production process, for example milling.
  • the one-piece design of the control wheel 4 eliminates the otherwise necessary foot / groove connection, which is usually responsible for limiting the load capacity of the control wheel 4.
  • the one-piece design of the control wheel 4 and the turbine shaft 2 eliminates the complex production of the grooves in the turbine shaft and the likewise very complex production of the blade root profiles on the individual rotor blades 3. In addition, there is no manual assembly of the individual rotor blades 3 in the respectively associated groove in the Turbine shaft 2 necessary, which significantly reduces the manufacturing and assembly times.
  • the control wheel 4 of the control wheel arrangement 1 further comprises a shroud 5.
  • the shroud 5 connects the free ends of the blades 3 to one another, as a result of which they are stabilized against vibrations. Furthermore, the shroud seals the gap between the control wheel 4 and the turbine housing. For this purpose, sealing tips are usually attached in the cover band.
  • the cover band 5 is formed in one piece with the control wheel 4. This results in a particularly rigid connection of the blade ends to the cover band 5. A subsequent, time-consuming application of the cover band 5 is eliminated.
  • FIG 2 shows the detail Z FIG. 1 .
  • the detailed view again shows the one-piece design of the control wheel arrangement 1, comprising the control wheel 4, the turbine shaft 2 and the cover band 5 clearly.
  • the one-piece design of the control wheel arrangement is achieved by first producing a turbine shaft blank by means of casting or forging, a corresponding material addition, for example in the form of a shoulder, being provided directly during manufacture.
  • the control wheel 4 is then formed with the individual moving blades 3 and possibly the cover band 5 by machining, for example milling.
  • a further processing of the surfaces for example grinding, polishing or rolling, can be carried out after milling.
  • the individual blades 3 can be formed from the turbine shaft blank in a very simple manner.
  • the control wheel 4 or the control wheel arrangement 1 is suitable for substantially higher speeds and steam input parameters. As a result, the efficiency of the steam turbine can be increased significantly.
  • FIG 3 shows a second embodiment of a control wheel arrangement 1.
  • the figure shows a radial section through a rotor blade 3.
  • the cover band 5 is not formed in one piece with the control wheel 4 or the rotor blades 3, but later by means of a material and / or positive connection the control wheel 4 connected.
  • the two-part design simplifies the milling process for the rotor blades 3.
  • the cover tape 5 can then be applied in a simple manner. For example, brazing or welding is suitable as the integral connection.
  • it is attached by means of a positive transition to the blade ends.
  • the shroud 5 is stepped and shrunk onto the free ends of the blades 3.
  • control wheel arrangement 1 for a steam turbine with the integral construction of the control wheel 4 and turbine shaft 2 has clear advantages over the control wheel arrangements known from the prior art.
  • control wheel arrangement 1 In addition to the significantly higher load capacity of the control wheel arrangement 1, there are also significant simplifications in the manufacture and assembly. In addition to the higher resilience, this results in significant cost advantages.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP19200724.3A 2018-10-15 2019-10-01 Dispositif de régulation pour une turbine à vapeur ainsi que procédé de fabrication d'un dispositif de régulation Withdrawn EP3640433A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018217597.7A DE102018217597A1 (de) 2018-10-15 2018-10-15 Regelradanordnung für eine Dampfturbine sowie Verfahren zum Herstellen einer Regelradanordnung

Publications (1)

Publication Number Publication Date
EP3640433A1 true EP3640433A1 (fr) 2020-04-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19200724.3A Withdrawn EP3640433A1 (fr) 2018-10-15 2019-10-01 Dispositif de régulation pour une turbine à vapeur ainsi que procédé de fabrication d'un dispositif de régulation

Country Status (2)

Country Link
EP (1) EP3640433A1 (fr)
DE (1) DE102018217597A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116658455A (zh) * 2023-04-28 2023-08-29 西安航天动力研究所 一种局部进气冲击式涡轮转子及组装方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19858702A1 (de) * 1998-12-18 2000-06-29 Mtu Muenchen Gmbh Schaufel und Rotor für eine Gasturbine und Verfahren zum Verbinden von Schaufelteilen
DE102009052305A1 (de) * 2009-11-07 2011-05-12 Mtu Aero Engines Gmbh Blisk, Gasturbine und Verfahren zur Herstellung einer derartigen Blisk
DE102010007335A1 (de) 2010-02-09 2011-08-11 Siemens Aktiengesellschaft, 80333 Laufrad einer Regelstufe einer Dampfturbine und Dampfturbine
US20150098802A1 (en) * 2013-10-08 2015-04-09 General Electric Company Shrouded turbine blisk and method of manufacturing same
US20150354374A1 (en) * 2014-06-09 2015-12-10 General Electric Company Turbine blisk and method of manufacturing thereof
DE102016119681A1 (de) * 2016-10-14 2018-04-19 Abb Turbo Systems Ag Integral gegossene Strömungsmaschinenanordung und Verfahren zum Herstellen einer Strömungsmaschinenanordnung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10053770A1 (de) * 2000-10-30 2002-05-02 Alstom Switzerland Ltd Verfahren zur Herstellung eines Regelrades für Dampfturbinen sowie ein nach dem Verfahren hergestelltes Regelrad
DE102008052947A1 (de) * 2008-10-23 2010-04-29 Siemens Aktiengesellschaft Verfahren zur Herstellung von Laufschaufeln und einer Radscheibe für eine Turbomaschine sowie Vorrichtung, aufweisend Laufschaufeln und eine Radscheibe für eine Turbomaschine
WO2012041645A1 (fr) * 2010-09-30 2012-04-05 Siemens Aktiengesellschaft Ensemble roue de réglage pour une turbine à vapeur

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19858702A1 (de) * 1998-12-18 2000-06-29 Mtu Muenchen Gmbh Schaufel und Rotor für eine Gasturbine und Verfahren zum Verbinden von Schaufelteilen
DE102009052305A1 (de) * 2009-11-07 2011-05-12 Mtu Aero Engines Gmbh Blisk, Gasturbine und Verfahren zur Herstellung einer derartigen Blisk
DE102010007335A1 (de) 2010-02-09 2011-08-11 Siemens Aktiengesellschaft, 80333 Laufrad einer Regelstufe einer Dampfturbine und Dampfturbine
US20150098802A1 (en) * 2013-10-08 2015-04-09 General Electric Company Shrouded turbine blisk and method of manufacturing same
US20150354374A1 (en) * 2014-06-09 2015-12-10 General Electric Company Turbine blisk and method of manufacturing thereof
DE102016119681A1 (de) * 2016-10-14 2018-04-19 Abb Turbo Systems Ag Integral gegossene Strömungsmaschinenanordung und Verfahren zum Herstellen einer Strömungsmaschinenanordnung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116658455A (zh) * 2023-04-28 2023-08-29 西安航天动力研究所 一种局部进气冲击式涡轮转子及组装方法

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