CN103806946B - Leaving area 2.1m2variable rotating speed industrial steam turbine low-pressure stage group exhaust stage blade - Google Patents
Leaving area 2.1m2variable rotating speed industrial steam turbine low-pressure stage group exhaust stage blade Download PDFInfo
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- CN103806946B CN103806946B CN201310526901.XA CN201310526901A CN103806946B CN 103806946 B CN103806946 B CN 103806946B CN 201310526901 A CN201310526901 A CN 201310526901A CN 103806946 B CN103806946 B CN 103806946B
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Abstract
The present invention relates to turbine blade field, especially disclose a kind of leaving area 2.1m with good off design performance and strength character2Variable rotating speed industrial steam turbine low-pressure stage group exhaust stage blade, it is a kind of variable cross-section twisted blade, including blade, blade root and for making blade form shroud and the lacing wire boss of whole circle self-locking, described blade is monotonicallyd increase up to 100% relative to leaf height Ld by 0%, and from blade root cross section, the pitch to chord length to leaf top section than T/b Changing Pattern is: 0.2≤T/b≤1.0；From blade root cross section to the pitch of leaf top section with blade profile cross section axial width ratio T/B Changing Pattern it is: 0.2≤T/B≤4.0；From blade root cross section to the pitch of leaf top section with blade profile cross section maximum gauge than T/Dmax Changing Pattern it is: 2.5≤T/Dmax≤17.5；This blade has good variable parameter operation performance and strength vibration performance；Rational in infrastructure, easy to assembly, can safe operation under back pressure 0.05bar～0.1bar, rotating speed 2500rpm～5500rpm, there is wide market application foreground.
Description
Technical field
The present invention relates to a kind of turbine blade field, especially a kind of leaving area 2.1m2Variable rotating speed industrial steam turbine low-pressure stage group exhaust stage blade.
Background technology
The demand of variable rotating speed industrial steam turbine power industry at home is continuously increased, and its efficient design gradually highlights its importance.Air-cooled Unit is a kind of typical variable parameter operation unit, relative to water chiller, the design back-pressure of Air-cooled Unit is high and economy scope is big, the variation of ambient temperature scope of air is big, exhaust stage blade is made must to be fulfilled for be run under air blast operating mode by blocking operating mode, no matter in the case of low back pressure, obstruction operating mode or high back pressure, air blast, the working condition of exhaust stage blade is the most severe.So low-pressure stage group exhaust stage blade has become the key link in design.The through-flow performance holding whole unit particularly low-pressure stage group the most exactly just can design the variable rotating speed industrial steam turbine exhaust stage blade of high efficient and reliable.
Summary of the invention
The invention aims to solve the deficiency of above-mentioned technology and a kind of leaving area 2.1m with good off design performance and strength character is provided2Variable rotating speed industrial steam turbine low-pressure stage group exhaust stage blade.
In order to achieve the above object, leaving area 2.1m designed by the present invention2Variable rotating speed industrial steam turbine low-pressure stage group exhaust stage blade, it is a kind of variable cross-section twisted blade, including blade, blade root and for making blade form shroud and the lacing wire boss of whole circle self-locking, it is characterized in that described blade is monotonicallyd increase up to 100% relative to leaf height Ld by 0%, from blade root cross section, the pitch to chord length to leaf top section than T/b Changing Pattern is: 0.2≤T/b≤1.0；From blade root cross section to the pitch of leaf top section with blade profile cross section axial width ratio T/B Changing Pattern it is: 0.2≤T/B≤4.0；From blade root cross section to the pitch of leaf top section with blade profile cross section maximum gauge than T/Dmax Changing Pattern it is: 2.5≤T/Dmax≤17.5；From blade root cross section to the pitch of leaf top section with blade profile area of section than T/A Changing Pattern it is: 0.02≤T/A≤0.30；From blade root cross section, the blade profile leading-edge radius R0 Changing Pattern to leaf top section is: 1.5mm≤R0≤2.0mm；From blade root cross section, the blade profile trailing edge radius R1 Changing Pattern to leaf top section is: 0.7mm≤R1≤1.0mm.
As optimization:
Described blade height is 500mm.
Described blade root is fir-tree root, and blade root axial width is 165mm.
Described lacing wire boss is elliptical table, 275mm bottom lacing wire boss centre-to-centre spacing blade.
It is provided with, at the leading edge back of the body arc of described blade, part of hardening.
Leaving area 2.1m obtained by the present invention2Variable rotating speed industrial steam turbine low-pressure stage group exhaust stage blade, blade uses three-dimensional flow designing technique to design, the width in cross section, thickness and cross-sectional area are gradually reduced to top by root, dullness seamlessly transits, along leaf height direction blade, there is certain distortion rule, take into account blade static strength requirement, reasonable along blade each thermal parameter regularity of distribution so that blade has good aeroperformance.Through specialty computational fluid dynamics software CFX and Numeca checking, back pressure be 0.06bar, exit Mach number be 0.5 operating mode under, the pneumatic efficiency of place low-pressure stage group is about 81%, and maximum stream flow, at more than 100t/h, has good off design performance simultaneously；Blade is the linear leaf carrying shroud whole circle self-locking damping type, blade middle and upper part has boss, there is shroud on leaf top, between each blade boss and all there is the gap of 0.1-0.6mm between shroud, under working speed, due to the effect of centrifugal force, blade produces certain anti-twisted, make to fit between lacing wire boss and lacing wire boss, shroud and shroud between blade, produce normal pressure and frictional force, add the damping of system；Reach blade whole circle self-locking structure simultaneously, improve the vibration performance of blade, reduce the dynamic stress suffered by blade；Blade root use fir-tree root design, blade is easy to assembly, can safe operation under back pressure 0.05bar～0.1bar, rotating speed 2500rpm～5500rpm, there is wide market application foreground.
Accompanying drawing explanation
Fig. 1 is the front view of the present invention；
Fig. 2 is the side view of the present invention；
Fig. 3 is the top view of the present invention；
Fig. 4 is the shroud top view of adjacent two blades of the present invention；
Fig. 5 is the lacing wire boss sectional view of adjacent two blades of the present invention；
Fig. 6 is the adjacent three blade self-locking connection diagrams of the present invention.
Detailed description of the invention
The invention will be further described to combine accompanying drawing below by embodiment.
Embodiment 1:
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, leaving area 2.1m that the present embodiment describes2Variable rotating speed industrial steam turbine low-pressure stage group exhaust stage blade, it is a kind of variable cross-section twisted blade, including blade 3, blade root 4 and for making blade form shroud 1 and the lacing wire boss 2 of whole circle self-locking, the described relative leaf height Ld of blade 3 is monotonicallyd increase up to 100% by 0%, and from blade root cross section, the pitch to chord length to leaf top section than T/b Changing Pattern is: 0.2≤T/b≤1.0；From blade root cross section to the pitch of leaf top section with blade profile cross section axial width ratio T/B Changing Pattern it is: 0.2≤T/B≤4.0；From blade root cross section to the pitch of leaf top section with blade profile cross section maximum gauge than T/Dmax Changing Pattern it is: 2.5≤T/Dmax≤17.5；From blade root cross section to the pitch of leaf top section with blade profile area of section than T/A Changing Pattern it is: 0.02≤T/A≤0.30；From blade root cross section, the blade profile leading-edge radius R0 Changing Pattern to leaf top section is: 1.5mm≤R0≤2.0mm；From blade root cross section, the blade profile trailing edge radius R1 Changing Pattern to leaf top section is: 0.7mm≤R1≤1.0mm, wherein: described blade 3 height is 500mm, described blade root 4 is fir-tree root 4, blade root 4 axial width is 165mm, described lacing wire boss 2 is elliptical table, 275mm bottom lacing wire boss 2 centre-to-centre spacing blade 3, described blade 3 leading edge the back of the body arc at be provided with part of hardening, length of hardening as required depending on.
Time static, blade is single chip architecture, and lacing wire boss 2 is not fitted with shroud 1, under working speed, effect due to centrifugal force, blade 3 produces certain anti-twisted, makes to produce between lacing wire boss 2 and lacing wire boss 2, shroud 1 and shroud 1 normal pressure and frictional force, adds the damping of system；Meanwhile, make the whole circle of blade in groups, improve the vibration performance of blade.
Claims (5)
1. leaving area 2.1m2Variable rotating speed industrial steam turbine low-pressure stage group exhaust stage blade, it is a kind of change
Cross section twisted blade, including blade, blade root and for making blade form shroud and the lacing wire of whole circle self-locking
Boss, is characterized in that described blade is monotonicallyd increase up to 100% relative to leaf height Ld by 0%, cuts from blade root
Face to the pitch to chord length of leaf top section than T/b Changing Pattern is: 0.2≤T/b≤1.0；From leaf
Root cross section to pitch width ratio axial with the blade profile cross section T/B Changing Pattern of leaf top section is: 0.2
≤T/B≤4.0；From blade root cross section to the pitch of leaf top section and blade profile cross section maximum gauge ratio
T/Dmax Changing Pattern is: 2.5≤T/Dmax≤17.5；From blade root cross section to the joint of leaf top section
Away from blade profile area of section than T/A Changing Pattern it is: 0.02≤T/A≤0.30；From blade root cross section
Blade profile leading-edge radius R0 Changing Pattern to leaf top section is: 1.5mm≤R0≤2.0mm；From leaf
Root cross section to the blade profile trailing edge radius R1 Changing Pattern of leaf top section is: 0.7mm≤R1≤1.0mm.
Leaving area 2.1m the most according to claim 12Variable rotating speed industrial steam turbine low-pressure stage group final stage leaf
Sheet, is characterized in that described blade height is 500mm.
Leaving area 2.1m the most according to claim 12Variable rotating speed industrial steam turbine low-pressure stage group final stage leaf
Sheet, is characterized in that described blade root is fir-tree root, and blade root axial width is 165mm.
Leaving area 2.1m the most according to claim 12Variable rotating speed industrial steam turbine low-pressure stage group final stage leaf
Sheet, is characterized in that described lacing wire boss is elliptical table, bottom lacing wire boss centre-to-centre spacing blade
275mm。
Leaving area 2.1m the most according to claim 12Variable rotating speed industrial steam turbine low-pressure stage group final stage leaf
Sheet, is characterized in that being provided with, at the leading edge back of the body arc of described blade, part of hardening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310526901.XA CN103806946B (en) | 2013-10-30 | 2013-10-30 | Leaving area 2.1m2variable rotating speed industrial steam turbine low-pressure stage group exhaust stage blade |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310526901.XA CN103806946B (en) | 2013-10-30 | 2013-10-30 | Leaving area 2.1m2variable rotating speed industrial steam turbine low-pressure stage group exhaust stage blade |
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| Publication Number | Publication Date |
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| CN103806946A CN103806946A (en) | 2014-05-21 |
| CN103806946B true CN103806946B (en) | 2016-08-17 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196573B (en) * | 2014-07-28 | 2017-02-22 | 杭州汽轮机股份有限公司 | Low-pressure last stage blade of rotating speed-variable air cooling industrial steam turbine with steam exhaust area of 3.6 m2 |
| CN106089314B (en) * | 2016-07-29 | 2017-10-31 | 杭州汽轮机股份有限公司 | Leaving area 3.2m2The low-pressure stage group final stage moving blade of efficient industrial steam turbine |
| CN109611158A (en) * | 2018-11-02 | 2019-04-12 | 杭州汽轮机股份有限公司 | A kind of industrial steam turbine 3600rpm high load capacity low-pressure stage movable vane piece |
| CN113605989B (en) * | 2021-09-14 | 2024-08-06 | 西安陕鼓动力股份有限公司 | Three-stage energy recovery gas turbine, stationary blade and movable blade for medium-sized blast furnace |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2177714A2 (en) * | 2008-10-14 | 2010-04-21 | General Electric Company | Blade for a low pressure section of a steam turbine engine |
| EP2434094A2 (en) * | 2010-09-28 | 2012-03-28 | Hitachi Ltd. | Steam turbine stator vane and steam turbine |
| CN102434223A (en) * | 2011-12-13 | 2012-05-02 | 杭州汽轮机股份有限公司 | Low-pressure stage final blade of large-flow air-cooled steam turbine |
| CN102536328A (en) * | 2011-12-13 | 2012-07-04 | 杭州汽轮机股份有限公司 | Last-stage blade in low-pressure stage group of variable-rotation-speed air-cooling industrial steam turbine |
| CN202745949U (en) * | 2012-07-04 | 2013-02-20 | 中国石油天然气股份有限公司 | Exhaust area is 2.8m2Low-pressure blade stage group of variable-speed steam turbine |
-
2013
- 2013-10-30 CN CN201310526901.XA patent/CN103806946B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2177714A2 (en) * | 2008-10-14 | 2010-04-21 | General Electric Company | Blade for a low pressure section of a steam turbine engine |
| EP2434094A2 (en) * | 2010-09-28 | 2012-03-28 | Hitachi Ltd. | Steam turbine stator vane and steam turbine |
| CN102434223A (en) * | 2011-12-13 | 2012-05-02 | 杭州汽轮机股份有限公司 | Low-pressure stage final blade of large-flow air-cooled steam turbine |
| CN102536328A (en) * | 2011-12-13 | 2012-07-04 | 杭州汽轮机股份有限公司 | Last-stage blade in low-pressure stage group of variable-rotation-speed air-cooling industrial steam turbine |
| CN202745949U (en) * | 2012-07-04 | 2013-02-20 | 中国石油天然气股份有限公司 | Exhaust area is 2.8m2Low-pressure blade stage group of variable-speed steam turbine |
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| CN103806946A (en) | 2014-05-21 |
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Address after: 310022 Building 1, No. 608, Kangxin Road, Linping District, Hangzhou, Zhejiang Patentee after: Hangzhou Turbine Power Group Co.,Ltd. Address before: 310022 No. 357 Shiqiao Road, Zhejiang, Hangzhou Patentee before: HANGZHOU STEAM TURBINE Co.,Ltd. |
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