CN203308530U - 一种300mw级汽轮机低压叶顶汽封结构 - Google Patents

一种300mw级汽轮机低压叶顶汽封结构 Download PDF

Info

Publication number
CN203308530U
CN203308530U CN2013203508670U CN201320350867U CN203308530U CN 203308530 U CN203308530 U CN 203308530U CN 2013203508670 U CN2013203508670 U CN 2013203508670U CN 201320350867 U CN201320350867 U CN 201320350867U CN 203308530 U CN203308530 U CN 203308530U
Authority
CN
China
Prior art keywords
steam
blade tip
receding
concession
seal
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.)
Expired - Fee Related
Application number
CN2013203508670U
Other languages
English (en)
Inventor
薛飞
赵丽华
肖官和
李恩峰
王艳
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.)
Beijing Longwei Power Generation Technology Co Ltd
Original Assignee
Beijing Longwei Power Generation Technology Co Ltd
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 Beijing Longwei Power Generation Technology Co Ltd filed Critical Beijing Longwei Power Generation Technology Co Ltd
Priority to CN2013203508670U priority Critical patent/CN203308530U/zh
Application granted granted Critical
Publication of CN203308530U publication Critical patent/CN203308530U/zh
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

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
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
    • F01D11/14—Adjusting or regulating tip-clearance, i.e. distance between rotor-blade tips and stator casing
    • F01D11/16—Adjusting or regulating tip-clearance, i.e. distance between rotor-blade tips and stator casing by self-adjusting means

Landscapes

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

Abstract

一种300MW级汽轮机低压叶顶汽封结构，用于提高汽轮机密封性能。其技术方案是：将隔板原叶顶汽封齿从叶顶汽封体上拔除，对叶顶汽封体内环进行补充加工，在补充加工后的叶顶汽封体内环上加工汽封槽，安装可退让式刷式汽封；可退让式刷式汽封背部加工有弹簧孔，设计一定数量的柱形弹簧，其在工作时可将可退让式刷式汽封压向转子，并在其与转子碰撞时具有退让性；在可退让式刷式汽封进汽侧设计通汽槽，供进汽侧蒸汽流入可退让式刷式汽封背部；可退让式刷式汽封的刷毛位置在出汽侧向进汽侧方向数的第2道。由于刷毛的存在，该处的汽封径向间隙可以减至更小，使汽轮机级内漏汽减少，汽轮机低压缸效率提高。基于上述作用原理，本实用新型具有比固定齿汽封更好的密封效果。

Description

一种300MW级汽轮机低压叶顶汽封结构
技术领域
本实用新型直接应用于300MW级汽轮机的节能降耗、增加机组出力的改造项目上。 
背景技术
国内某些300MW级汽轮机，其低压缸所发功率占机组总功率的40％左右，低压缸效率的高低对机组经济性有重要影响。某些300MW级汽轮机，其低压叶顶汽封为传统形式的固定齿汽封，这种汽封在机组运行时不能退让，普遍存在比较严重的磨损情况。为了避免磨损，在汽轮机设计时将汽封径向间隙设计为较大值，而在汽轮机组装时也不得不调大汽封径向间隙，同时延长机组启动时间。但是实际上大修后第一次启动时磨损就已经发生，机组实际上是长期在大汽封间隙下运行，蒸汽泄漏严重，低压缸效率偏低。汽封磨损甚至可能导致围带断裂和机组异常振动，影响机组的安全性。 
发明内容
为减少该型汽轮机低压叶顶汽封漏汽，提高低压缸效率，增加机组运行的安全性，将低压叶顶汽封改造为可退让式刷式汽封。 
本实用新型解决其技术问题所采用的技术方案是：一种300MW级汽轮机低压叶顶汽封结构，包括隔板、叶顶汽封体、可退让式刷式汽封、叶顶围带、柱形弹簧、通汽槽等，在叶顶汽封体内环加工汽封槽，安装可退让式刷式汽封，可退让式刷式汽封背部加工有弹簧孔，设计一定数量的柱形弹簧，其在工作时可将可退让式刷式汽封压向转子，并在其与转子碰撞时具有退让性。在可退让式刷式汽封进汽侧设计通汽槽，供进汽侧蒸汽流入可退让式刷式汽封背部。所述可退让式刷式汽封的刷毛位置在出汽侧向进汽侧方向数的第2道。 
本实用新型的有益效果是，在汽轮机工作时，可退让式刷式汽封如与转子发生碰撞，可以自由退让，避免损伤转子，同时由于刷毛的存在，该处的汽封径向间隙可以减至更小，使汽轮机级内漏汽减少，汽轮机低压缸效率提高。 
附图说明
下面结合附图和实施例对本实用新型进一步说明。 
图1是本实用新型装配示意图。 
图2是本实用新型通汽槽示意图。 
图3是本实用新型装配间隙示意图。 
图中1.隔板，2.叶顶汽封体，3.可退让式刷式汽封，4.叶顶围带，5.柱形弹簧，6.刷毛，7.通汽槽，8.汽封齿。 
具体实施方式
利用车床按照设计图纸加工可退让式刷式汽封至图纸设计尺寸，在相应位置焊接用于密封的刷毛，部分尺寸需留余量，待电厂停机后，测量相关尺寸，然后根据测量尺寸配车后加下到位。电厂停机后，低压改造级隔板返回加工车间，将隔板原叶顶汽封齿从叶顶汽封体上拔除，利用车床补充加工叶顶汽封体至图纸设计尺寸，然后在叶顶汽封体内环加工汽封槽。在电厂检修现场安装可退让式刷式汽封，并调整汽封齿径向间隙及刷毛径向间隙至设计值。 
在图1所示实施例中，对隔板(1)原叶顶汽封体(2)进行补充加工，然后在加工后的叶顶汽封体(2)内环上加工汽封槽，可退让式刷式汽封(3)通过柱形弹簧(5)安装于汽封槽内。可退让式刷式汽封(3)与叶顶围带(4)形成密封结构。 
本实用新型的通汽槽示意图见图2，通汽槽(7)在进汽侧方向。 
在图3所示实施例中，检修现场将可退让式刷式汽封(3)的汽封齿(8)及刷毛(6)与叶顶围带(4)径向间隙A、B修配至设计值。 

Claims (3)

1.一种300MW级汽轮机低压叶顶汽封结构，包括隔板、叶顶汽封体、可退让式刷式汽封、叶顶围带、柱形弹簧、通汽槽等，其特征是：在叶顶汽封体内环上加工汽封槽，安装可退让式刷式汽封，可退让式刷式汽封背部加工有弹簧孔，设计一定数量的柱形弹簧，其在工作时可将可退让式刷式汽封压向转子，并在其与转子碰撞时具有退让性。
2.根据权利要求1所述的300MW级汽轮机低压叶顶汽封结构，其特征是：在可退让式刷式汽封进汽侧设计通汽槽，供进汽侧蒸汽流入可退让式刷式汽封背部。
3.根据权利要求1所述的300MW级汽轮机低压叶顶汽封结构，其特征是：所述可退让式刷式汽封的刷毛位置在出汽侧向进汽侧方向数的第2道。
CN2013203508670U 2013-06-19 2013-06-19 一种300mw级汽轮机低压叶顶汽封结构 Expired - Fee Related CN203308530U (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2013203508670U CN203308530U (zh) 2013-06-19 2013-06-19 一种300mw级汽轮机低压叶顶汽封结构

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2013203508670U CN203308530U (zh) 2013-06-19 2013-06-19 一种300mw级汽轮机低压叶顶汽封结构

Publications (1)

Publication Number Publication Date
CN203308530U true CN203308530U (zh) 2013-11-27

Family

ID=49614745

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2013203508670U Expired - Fee Related CN203308530U (zh) 2013-06-19 2013-06-19 一种300mw级汽轮机低压叶顶汽封结构

Country Status (1)

Country Link
CN (1) CN203308530U (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109441568A (zh) * 2018-11-16 2019-03-08 华电电力科学研究院有限公司 一种高效率的低压隔板套装置及其装配方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109441568A (zh) * 2018-11-16 2019-03-08 华电电力科学研究院有限公司 一种高效率的低压隔板套装置及其装配方法
CN109441568B (zh) * 2018-11-16 2024-04-19 华电电力科学研究院有限公司 一种高效率的低压隔板套装置及其装配方法

Similar Documents

Publication Publication Date Title
CN203374323U (zh) 低压前后轴封
CN103335761B (zh) 汽轮机通流级动静汽封泄漏对汽轮机功率损失的评估方法
CN204511525U (zh) 一种新型600mw级汽轮机喷嘴组
CN203308530U (zh) 一种300mw级汽轮机低压叶顶汽封结构
CN203978514U (zh) 一种分体式300mw级汽轮机喷嘴组
CN201991572U (zh) 主、侧齿和蜂窝带组合迷宫式汽封
CN201826901U (zh) 再热式背压汽轮机
CN104454026A (zh) 一种航空发动机转子叶片锯齿冠
CN102797512B (zh) 汽轮机汽封结构及装配方法
CN208502850U (zh) 一种适用于高背压汽轮机的低压隔板和隔板套
CN204511527U (zh) 一种组合式可退让式汽轮机低压叶顶汽封结构
CN202081919U (zh) 一种300mw汽轮机汽封结构
CN203308526U (zh) 一种改进的亚临界300mw汽轮机喷嘴组
CN103363145B (zh) 水电站进水球阀高油压操作硬密封结构
CN203925600U (zh) 一种新型300mw级焊接式汽轮机喷嘴组结构
CN202065014U (zh) 一种200mw汽轮机汽封结构
CN109611164A (zh) 一种汽轮机机组通流改造的方法
CN203685302U (zh) 一种300mw级汽轮机喷嘴组
CN204200300U (zh) 气缸头盖多点喷射润滑结构
CN203769865U (zh) 涡轮增压器隔热罩
CN204402751U (zh) 一种潮汐发电机
CN202081918U (zh) 一种600mw汽轮机喷嘴
CN201059205Y (zh) 高压缸速度级汽封片
CN202560332U (zh) 单双齿双面侧齿可调汽封
CN204099016U (zh) 一种组装式发电排气管

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
CP01 Change in the name or title of a patent holder
CP01 Change in the name or title of a patent holder

Address after: 100044 18th floor, Fangyuan building, No.56, Zhongguancun South Street, Haidian District, Beijing

Patentee after: Beijing Guoneng Longwei Power Generation Technology Co.,Ltd.

Address before: 100044 18th floor, Fangyuan building, No.56, Zhongguancun South Street, Haidian District, Beijing

Patentee before: BEIJING LONGWEI POWER GENERATION TECHNOLOGY Co.,Ltd.

DD01 Delivery of document by public notice
DD01 Delivery of document by public notice

Addressee: Xue Fei

Document name: Notification of eligibility

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20131127