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CN110939487A - A device and method for treating low-pressure rotor blade shroud clearance of a steam turbine - Google Patents

A device and method for treating low-pressure rotor blade shroud clearance of a steam turbine Download PDF

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Publication number
CN110939487A
CN110939487A CN201911244546.0A CN201911244546A CN110939487A CN 110939487 A CN110939487 A CN 110939487A CN 201911244546 A CN201911244546 A CN 201911244546A CN 110939487 A CN110939487 A CN 110939487A
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CN
China
Prior art keywords
blade
shroud
insert
working surface
gap
Prior art date
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Pending
Application number
CN201911244546.0A
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Chinese (zh)
Inventor
秦专
李战争
薛彦春
窦建业
曹政
闫鹏
王志松
方小峰
骆祖春
孙晨
崔添棋
温森特
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.)
Jiangsu Nuclear Power Corp
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Jiangsu Nuclear Power Corp
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Filing date
Publication date
Application filed by Jiangsu Nuclear Power Corp filed Critical Jiangsu Nuclear Power Corp
Priority to CN201911244546.0A priority Critical patent/CN110939487A/en
Publication of CN110939487A publication Critical patent/CN110939487A/en
Pending legal-status Critical Current

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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
    • F01D5/12—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P6/00—Restoring or reconditioning objects
    • B23P6/002—Repairing turbine components, e.g. moving or stationary blades, rotors
    • 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
    • F01D5/005—Repairing methods or devices
    • 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
    • F05D2260/00—Function
    • F05D2260/96—Preventing, counteracting or reducing vibration or noise

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

Abstract

The invention belongs to the technical field of steam turbines, and particularly relates to a device and a method for treating a low-pressure rotor blade shroud gap of a steam turbine. In the invention, the blade jacking tool is positioned between the lower blade and the upper blade; the lower blade is fixedly connected with the lower blade shroud band, and the upper blade is fixedly connected with the upper blade shroud band; a shroud band working surface gap is formed between an upper blade shroud band working surface of the upper blade and a lower blade shroud band working surface of the lower blade, and the inserting sheet is positioned in the shroud band working surface gap; the method comprises the following steps of firstly, confirming the clearance; secondly, polishing the working surfaces of adjacent surrounding belts; step three, installing the inserting sheet; step four, spot welding the tail of the insertion piece; and step five, final repair. The invention can eliminate or reduce the working surface clearance of the shroud, thereby ensuring the safe and stable operation of the rotor blade.

Description

Device and method for treating turbine low-pressure rotor blade shroud clearance
Technical Field
The invention belongs to the technical field of steam turbines, and particularly relates to a device and a method for treating a low-pressure rotor blade shroud gap of a steam turbine.
Background
The length of the last stage blade of the low-pressure rotor of two turbines in one period of a certain nuclear power station is 1200mm, the blade is designed into a damping blade with a crown, and the whole circle of blade is reinforced by two lacing wires.
The damping blade dissipates the energy generated by the blade cascade in the vibration process by utilizing the dry friction between the working surfaces of the blade so as to achieve the aim of vibration reduction.
Along with the long-time operation of steam turbine, the steam turbine low pressure jar disintegrates and overhauls the discovery, has produced the clearance gradually between the low pressure rotor last stage blade shroud because of the mutual friction in operation.
The existence of the shroud clearance can change the contact force of the blade in the working state, and influence the vibration characteristic of the whole-circle blade and the vibration reduction effect of the damping structure.
If the shroud clearance is too large, the blade top can not be closed under the working state, so that the vibration reduction function of the damping structure is lost, and the stable operation of the steam turbine set is seriously influenced.
Disclosure of Invention
The technical problems solved by the invention are as follows:
the invention provides a device and a method for processing the shroud clearance of a low-pressure rotor blade of a steam turbine, which can eliminate or reduce the clearance of a working surface of the shroud so as to ensure the safe and stable operation of the rotor blade.
The technical scheme adopted by the invention is as follows:
a device for processing the gap of the shroud of the low-pressure rotor blade of a steam turbine comprises a blade supporting tool, a lower blade shroud, an upper blade and an inserting piece, wherein the blade supporting tool is positioned between the lower blade and the upper blade; the lower blade is fixedly connected with the lower blade shroud band, and the upper blade is fixedly connected with the upper blade shroud band; a shroud working face gap is formed between an upper blade shroud working face of the upper blade and a lower blade shroud working face of the lower blade, and the inserting piece is located inside the shroud working face gap.
Blade props a distance that the instrument can increase between blade and the last blade down, conveniently carries out the coping to blade shroud band working face, and is favorable to the adaptation coping of inserted sheet.
The inserted sheet is L type structure, and wherein one side is the inserted sheet afterbody, and the another side divide into the inserted sheet inboard and the inserted sheet outside.
The inner side of the inserting piece is attached to the working surface of the lower blade shroud, and the outer side of the inserting piece is attached to the working surface of the upper blade shroud.
The tail part of the inserting piece is spot-welded on the lower blade surrounding belt.
The processing method of the device for processing the turbine low-pressure rotor blade shroud clearance comprises the following steps:
step one, gap confirmation: measuring the working surface gap of the shroud band of the low-pressure rotor blade, wherein if the working surface gap between adjacent shroud bands is larger than 1.0mm, an insert needs to be installed;
step two, polishing the working surfaces of adjacent surrounding belts: expanding the working surface by a special supporting tool to increase the gap of the working surface of the shroud band, wherein the expanded gap is not more than 3mm, and grinding steps and burrs left on the working surface of the upper blade shroud band and the working surface of the lower blade shroud band due to abrasion;
step three, installing the inserting sheet;
step four, spot welding the tail of the insertion piece: cleaning the tail part of the insert and the back part of the shroud ring by using alcohol; in order to prevent the inserting piece from falling off during operation, the tail part of the inserting piece is spot-welded on the back part of the surrounding belt of the lower blade; PT checking that spot welding has no crack;
step five, final repair: grinding the part of the top of the insert, which exceeds the outer side of the shroud band, until the part is flush with the outer side of the shroud band; and (5) grinding surface burrs and cleaning an insert region.
In the third step, the inner side of the polished insert and the outer side of the insert are matched with the gap of the working surface; expanding the working surface by using a supporting tool, and carrying out adaptive grinding on the inserting sheet; gradually loosening the top supporting tool, enabling the adjacent shroud bands to be in a free state, enabling the inserting pieces to be freely inserted, enabling the inner sides of the inserting pieces to be tightly attached to the working surface of the lower blade shroud band and the outer sides of the inserting pieces to be tightly attached to the working surface of the upper blade shroud band; and (5) checking the joint of the insert and the working surface of the shroud band by using a light transmission method.
The invention has the beneficial effects that:
(1) the device and the method for treating the shroud clearance of the low-pressure rotor blade of the steam turbine can eliminate or reduce the clearance of the working surface of the shroud, so that the rotor blade can safely and stably operate;
(2) the device and the method for treating the turbine low-pressure rotor blade shroud clearance can enhance the vibration reduction function and ensure the stable operation of a turbine unit.
Drawings
FIG. 1 is a schematic view of a portion of the apparatus for treating the shroud gap of a low pressure rotor blade of a steam turbine according to the present invention;
FIG. 2 is a schematic view of the installation of an insert in an apparatus for treating the gap of a low pressure rotor blade shroud of a steam turbine;
FIG. 3 is a schematic view of the insert;
FIG. 4 is a schematic view of a tab spot welding location;
in the figure: 1-blade supporting tool, 2-lower blade, 3-lower blade shroud, 4-upper blade shroud, 5-upper blade, 6-upper blade shroud working face, 7-lower blade shroud working face, 8-shroud working face gap, 9-insert, 10-insert inside, 11-insert outside and 12-insert tail.
Detailed Description
The following provides a device and a method for treating the shroud gap of a low pressure rotor blade of a steam turbine according to the present invention with reference to the accompanying drawings and embodiments.
As shown in fig. 1, a device for processing the gap of the low-pressure rotor blade shroud of a steam turbine comprises a blade supporting tool 1, a lower blade 2, a lower blade shroud 3, an upper blade shroud 4, an upper blade 5 and an insert 9, wherein the blade supporting tool 1 is positioned between the lower blade 2 and the upper blade 5, the distance between the lower blade 2 and the upper blade 5 can be increased through the blade supporting tool 1, the working surface of the blade shroud is convenient to grind, and the adaptation grinding of the insert is facilitated; the lower blade 2 is fixedly connected with the lower blade shroud 3, and the upper blade 5 is fixedly connected with the upper blade shroud 4; a shroud working surface gap 8 is formed between the upper blade shroud working surface 6 of the upper blade 5 and the lower blade shroud working surface 7 of the lower blade 2, and as shown in fig. 2, the insert sheet 9 is positioned in the shroud working surface gap 8.
As shown in fig. 3, the inserting sheet 9 is an L-shaped structure, one side of which is an inserting sheet tail 12, and the other side of which is an inserting sheet inner side 10 and an inserting sheet outer side 11, the inserting sheet inner side 10 is attached to the lower blade shroud working surface 7, and the inserting sheet outer side 11 is attached to the upper blade shroud working surface 6.
As shown in fig. 4, the tab tail 12 of the tab 9 is spot welded to the lower blade shroud 3.
The invention provides a method for treating the shroud clearance of a low-pressure rotor blade of a steam turbine, which comprises the following steps:
step one, gap confirmation: and measuring the clearance of the working surface of the shroud of the low-pressure rotor blade, wherein the clearance of the working surface between adjacent shrouds is larger than 1.0mm, and then inserting pieces need to be installed.
Step two, polishing the working surfaces of adjacent surrounding belts: and (3) expanding the working surface by using a special expanding tool to increase the gap 8 of the shroud working surface, wherein the expanded gap is not more than 3mm, and grinding steps and burrs left on the upper blade shroud working surface 6 and the lower blade shroud working surface 7 due to abrasion.
Step three, installing the inserting piece:
grinding the inner side 10 and the outer side 11 of the insert according to the shape of the gap in the figure 1;
expanding the working surface by using a supporting tool, and carrying out adaptive grinding on the inserting sheet;
gradually loosening the top supporting tool, enabling the adjacent shroud rings to be in a free state, enabling the inserting pieces to be freely inserted, enabling the inner sides 10 of the inserting pieces to be tightly attached to the working surface 7 of the lower blade shroud ring, and enabling the outer sides 11 of the inserting pieces to be tightly attached to the working surface 6 of the upper blade shroud ring;
and (5) checking the joint of the insert and the working surface of the shroud band by using a light transmission method.
Step four, spot welding the tail of the insertion piece:
cleaning the tail part of the insert and the back part of the shroud ring by using alcohol;
in order to prevent the inserting piece from falling off in operation, the tail part 12 of the inserting piece is spot-welded on the back part of the lower blade shroud ring 3; the spot welding was checked for cracks by PT inspection.
Step five, final repair:
grinding the part of the top of the insert, which exceeds the outer side of the shroud band, until the part is flush with the outer side of the shroud band;
and (5) grinding surface burrs and cleaning an insert region.
The present invention has been described in detail with reference to the drawings and the actual operation, but the present invention is not limited to the above-described operation, and various changes, including changes in size, etc., can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. The prior art can be used for the content which is not described in detail in the present invention.

Claims (7)

1.一种处理汽轮机低压转子叶片围带间隙的装置，其特征在于：包括叶片撑顶工具(1)、下叶片(2)、下叶片围带(3)、上叶片围带(4)、上叶片(5)、插片(9)，叶片撑顶工具(1)位于下叶片(2)与上叶片(5)之间；下叶片(2)与下叶片围带(3)固定连接，上叶片(5)与上叶片围带(4)固定连接；上叶片(5)的上叶片围带工作面(6)与下叶片(2)的下叶片围带工作面(7)之间形成围带工作面间隙(8)，插片(9)位于围带工作面间隙(8)内部。1. A device for processing the shroud gap of a low-pressure rotor blade of a steam turbine, characterized in that: it comprises a blade supporting tool (1), a lower blade (2), a lower blade shroud (3), an upper blade shroud (4), The upper blade (5), the insert piece (9), and the blade top support tool (1) are located between the lower blade (2) and the upper blade (5); the lower blade (2) is fixedly connected with the lower blade shroud (3), The upper blade (5) is fixedly connected with the upper blade shroud (4); the upper blade shroud working surface (6) of the upper blade (5) and the lower blade shroud working surface (7) of the lower blade (2) are formed between The shroud working face gap (8), and the insert piece (9) is located inside the shroud working face gap (8). 2.根据权利要求1所述的一种处理汽轮机低压转子叶片围带间隙的装置，其特征在于：所述叶片撑顶工具(1)能够增大下叶片(2)与上叶片(5)之间的距离，方便对叶片围带工作面进行修磨，且有利于插片的适配修磨。2. A device for processing low-pressure rotor blade shroud gaps of steam turbines according to claim 1, wherein the blade topping tool (1) can increase the distance between the lower blade (2) and the upper blade (5) The distance between the blades is convenient for grinding the working surface of the blade shroud, and it is conducive to the fitting and grinding of the inserts. 3.根据权利要求1所述的一种处理汽轮机低压转子叶片围带间隙的装置，其特征在于：插片(9)为L型结构，其中一边为插片尾部(12)，另一边分为插片内侧(10)和插片外侧(11)。3. A device for processing the shroud gap of a low-pressure rotor blade of a steam turbine according to claim 1, wherein the insert piece (9) is an L-shaped structure, and one side is the insert piece tail (12), and the other side is divided into Inside (10) of the insert and outside (11) of the insert. 4.根据权利要求3所述的一种处理汽轮机低压转子叶片围带间隙的装置，其特征在于：所述插片内侧(10)与下叶片围带工作面(7)贴合，插片外侧(11)与上叶片围带工作面(6)贴合。4. A device for processing low-pressure rotor blade shroud gaps of steam turbines according to claim 3, characterized in that: the inner side (10) of the insert is fitted with the lower blade shroud working surface (7), and the outer side of the insert (11) fit with the working surface (6) of the upper blade shroud. 5.根据权利要求4所述的一种处理汽轮机低压转子叶片围带间隙的装置，其特征在于：所述插片(9)的插片尾部(12)点焊在下叶片围带(3)上。5. A device for processing low-pressure rotor blade shroud gaps of steam turbines according to claim 4, characterized in that: the blade tail (12) of the said blade (9) is spot welded on the lower blade shroud (3) . 6.根据权利要求5所述的处理汽轮机低压转子叶片围带间隙装置的处理方法，其特征在于：包括如下步骤：6. The processing method for processing the low-pressure rotor blade shroud gap device of a steam turbine according to claim 5, characterized in that: comprising the steps of: 步骤一、间隙确认：测量低压转子叶片围带工作面间隙，相邻围带间工作面间隙(8)大于1.0mm，则需要安装插片(9)；Step 1. Clearance confirmation: Measure the working face clearance of the low-pressure rotor blade shroud. If the working face gap (8) between adjacent shrouds is greater than 1.0mm, the insert (9) needs to be installed; 步骤二、相邻围带工作面打磨：用专用撑顶工具撑开工作面，使围带工作面间隙(8)增大，撑开后的间隙不超过3mm，对上叶片围带工作面(6)和下叶片围带工作面(7)上因磨损留下的台阶及毛刺进行修磨处理；Step 2. Grinding the working face of the adjacent shroud: Use a special top support tool to open the working face to increase the gap (8) of the working face of the shroud. 6) Grinding the steps and burrs left by wear on the working surface (7) of the lower blade shroud; 步骤三、安装插片；Step 3, install the insert; 步骤四、插片尾部点焊：对插片尾部与围带背部用酒精清理；为防止运行中插片脱落，将插片尾部(12)点焊在下叶片围带(3)背部；PT检查点焊无裂纹；Step 4. Spot welding at the tail of the blade: Clean the tail of the blade and the back of the shroud with alcohol; in order to prevent the blade from falling off during operation, spot-weld the tail of the blade (12) on the back of the lower blade shroud (3); PT check point Welding without cracks; 步骤五、最终修理：对插片顶部超出围带外侧的部分进行修磨，直至与围带外侧面平；修磨表面毛刺，对插片区域清理。Step 5. Final repair: Grind the top part of the insert beyond the outer side of the shroud until it is level with the outer side of the shroud; grind the surface burrs and clean the insert area. 7.根据权利要求6所述的处理汽轮机低压转子叶片围带间隙的方法，其特征在于：所述步骤三中，修磨插片内侧(10)和插片外侧(11)与工作面间隙(8)相配合；利用撑顶工具撑开工作面，对插片(9)进行适配修磨；逐渐松开撑顶工具，相邻围带处于自由状态下，插片(9)能自由插入，且插片内侧(10)与下叶片围带工作面(7)紧密贴合，插片外侧(11)与上叶片围带工作面(6)紧密贴合；用透光法，检查插片与围带工作面的贴合。7. The method for processing the shroud gap of a low-pressure rotor blade of a steam turbine according to claim 6, characterized in that: in the step 3, the inner side (10) and the outer side (11) of the blade are repaired and the clearance between the working face (10). 8) Match; use the top support tool to open the working surface, and fit the insert piece (9) for grinding; gradually loosen the top support tool, the adjacent shroud is in a free state, and the insert piece (9) can be inserted freely , and the inner side (10) of the insert is closely attached to the working surface (7) of the lower blade shroud, and the outer side (11) of the insert is closely attached to the working surface (6) of the upper blade shroud; use the light transmission method to check the insert Fitting with the work surface of the girdle.
CN201911244546.0A 2019-12-06 2019-12-06 A device and method for treating low-pressure rotor blade shroud clearance of a steam turbine Pending CN110939487A (en)

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CN201911244546.0A CN110939487A (en) 2019-12-06 2019-12-06 A device and method for treating low-pressure rotor blade shroud clearance of a steam turbine

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115502654A (en) * 2022-09-14 2022-12-23 哈电发电设备国家工程研究中心有限公司 Gap repairing insert and gap repairing method for turbine titanium alloy blade shroud band
RU230929U1 (en) * 2024-10-01 2024-12-25 Акционерное общество "Силовые машины - ЗТЛ, ЛМЗ, Электросила, Энергомашэкспорт" (АО "Силовые машины") Shroud shelf of a working blade of a steam turbine

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US20050042092A1 (en) * 2003-07-23 2005-02-24 Andreas Boegli Method of reconditioning a turbine blade
CN105121785A (en) * 2013-04-17 2015-12-02 西门子公司 Method for restoring a cover plate pre-tension
CN109653816A (en) * 2019-01-23 2019-04-19 江苏核电有限公司 It is a kind of for steam turbine from the support tool and its support method of integral blade
CN110454234A (en) * 2018-05-07 2019-11-15 通用电气公司 The interlocking grade of airfoil
CN211975069U (en) * 2019-12-06 2020-11-20 江苏核电有限公司 Device for treating turbine low-pressure rotor blade shroud clearance

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Publication number Priority date Publication date Assignee Title
EP0999009A1 (en) * 1998-11-02 2000-05-10 General Electric Company Method of applying wear-resistant materials to turbine blades, and turbine blades having wear-resistant materials
US20050042092A1 (en) * 2003-07-23 2005-02-24 Andreas Boegli Method of reconditioning a turbine blade
CN105121785A (en) * 2013-04-17 2015-12-02 西门子公司 Method for restoring a cover plate pre-tension
CN110454234A (en) * 2018-05-07 2019-11-15 通用电气公司 The interlocking grade of airfoil
CN109653816A (en) * 2019-01-23 2019-04-19 江苏核电有限公司 It is a kind of for steam turbine from the support tool and its support method of integral blade
CN211975069U (en) * 2019-12-06 2020-11-20 江苏核电有限公司 Device for treating turbine low-pressure rotor blade shroud clearance

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115502654A (en) * 2022-09-14 2022-12-23 哈电发电设备国家工程研究中心有限公司 Gap repairing insert and gap repairing method for turbine titanium alloy blade shroud band
WO2024055509A1 (en) * 2022-09-14 2024-03-21 哈电发电设备国家工程研究中心有限公司 Insertion piece and method for repairing gap between shrouds of titanium alloy blades of steam turbine
RU230929U1 (en) * 2024-10-01 2024-12-25 Акционерное общество "Силовые машины - ЗТЛ, ЛМЗ, Электросила, Энергомашэкспорт" (АО "Силовые машины") Shroud shelf of a working blade of a steam turbine

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