CN203948136U - The low pressure stage group exhaust stage blade of leaving area 3.6m2 variable speed air cooling industrial steam turbine - Google Patents
The low pressure stage group exhaust stage blade of leaving area 3.6m2 variable speed air cooling industrial steam turbine Download PDFInfo
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- CN203948136U CN203948136U CN201420415024.9U CN201420415024U CN203948136U CN 203948136 U CN203948136 U CN 203948136U CN 201420415024 U CN201420415024 U CN 201420415024U CN 203948136 U CN203948136 U CN 203948136U
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Abstract
The disclosed leaving area 3.6m2 variable speed of the utility model air cooling industrial steam turbine low pressure stage group exhaust stage blade, it is a kind of variable cross section twisted blade, comprise blade, blade root and for making blade form shroud and the lacing wire boss of whole circle self-locking, the high Ld of the relative leaf of described blade, by 0% monotone increasing to 100%, from the pitch to chord length of Dao Ye top section, blade root cross section than T/b Changing Pattern is: 0.4≤T/b≤1.0; From the pitch of Dao Ye top section, blade root cross section with blade profile cross section axial width than T/B Changing Pattern be: 0.4≤T/B≤3.5; From the pitch of Dao Ye top section, blade root cross section with blade profile cross section maximum ga(u)ge than T/Dmax Changing Pattern be: 2.5≤T/Dmax≤21.5; This blade has good variable parameter operation performance and strength vibration performance; Rational in infrastructure, easy to assembly, can be at back pressure 0.05bar ~ 0.25bar, safe operation under rotating speed 3000rpm ~ 4000rpm, has wide market application foreground.
Description
Technical field
The utility model relates to a kind of turbine blade, especially a kind of leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade.
Background technique
The variable speed air cooling industrial steam turbine at home demand of power industry constantly increases, and its efficient design highlights its significance gradually.Air-cooled Unit is a kind of typical variable parameter operation unit, with respect to water chiller, the design back-pressure of Air-cooled Unit is high and economy scope is large, the variation of ambient temperature scope of atmosphere is large, exhaust stage blade must be met can be moved by blocking operating mode under air blast operating mode, no matter in low back pressure, block in operating mode or high back pressure, air blast situation, the operating conditions of exhaust stage blade is all very severe.So low pressure stage group exhaust stage blade has become the key link in design.Only have hold exactly whole unit particularly the through-flow performance of low pressure stage group just can design the variable speed air cooling industrial steam turbine exhaust stage blade of high efficient and reliable.
Model utility content
The purpose of this utility model is the deficiency in order to solve above-mentioned technology and a kind of leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade of designing, and this blade has good off design performance and strength character, rational in infrastructure, easy to assembly.
The leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade that the utility model is designed, it is a kind of variable cross section twisted blade, comprise blade, blade root and for making blade form shroud and the lacing wire boss of whole circle self-locking, the high Ld of the relative leaf of described blade, by 0% monotone increasing to 100%, from the pitch to chord length of Dao Ye top section, blade root cross section than T/b Changing Pattern is: 0.4≤T/b≤1.0; From the pitch of Dao Ye top section, blade root cross section with blade profile cross section axial width than T/B Changing Pattern be: 0.4≤T/B≤3.5; From the pitch of Dao Ye top section, blade root cross section with blade profile cross section maximum ga(u)ge than T/Dmax Changing Pattern be: 2.5≤T/Dmax≤21.5; From the pitch of Dao Ye top section, blade root cross section with blade profile section area than T/A Changing Pattern be: 0.01≤T/A≤0.20; From the blade profile leading-edge radius R0 Changing Pattern of Dao Ye top section, blade root cross section be: 1.5mm≤R0≤1.8mm; From blade profile trailing edge radius R 1 Changing Pattern of Dao Ye top section, blade root cross section be: 1.2mm≤R1≤1.7mm.
As preferably:
Described blade height is 580mm.
Described blade root is fir-tree root, and blade root axial width is 220mm.
Described boss is elliptical table, boss centre distance blade bottom 360mm.
Described blade, its leading edge back of the body arc place is provided with the part of hardening.
The leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade of the utility model gained, blade adopts three-dimensional flow designing technique to design, width, thickness and the cross sectional area in cross section are reduced to top gradually by root, dullness seamlessly transits, there is certain distortion rule along the high direction blade of leaf, take into account the requirement of blade static strength, reasonable along the each thermal parameter regularity of distribution of blade, make blade there is good aeroperformance.Through professional computational fluid dynamics software CFX and Numeca checking, be that under the operating mode of 0.1bar, outlet Mach 2 ship 0.5, the pneumatic efficiency of place low pressure stage group is in 82% left and right in back pressure, peak rate of flow, more than 320t/h, has good off design performance simultaneously; Blade is the linear leaf that carries the whole circle self-locking damping of shroud type, blade middle and upper part has boss, there is shroud on leaf top, between each blade boss and all have 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 between boss and boss, shroud and shroud, to fit between blade, produce positive pressure and frictional force, increased the damping of system; Reach the whole circle self-locking structure of blade simultaneously, improve the vibration performance of blade, reduce the suffered dynamic stress of blade; Blade root adopts fir-tree root design, and blade is easy to assembly, can be at back pressure 0.05bar ~ 0.25bar, and safe operation under rotating speed 3000rpm ~ 4000rpm, has wide market application foreground.
Brief description of the drawings
Fig. 1 is the utility model blade front view.
Fig. 2 is the utility model blade-side view.
Fig. 3 is the utility model blade plan view.
Fig. 4 is the long-pending folded schematic diagram of the utility model vane type line.
The adjacent two blade shroud band plan views of Fig. 5.
Fig. 6 is the adjacent two blade boss sectional views of the utility model.
Fig. 7 is the adjacent three blade self-locking connection diagrams of the utility model.
In figure: shroud 1, lacing wire boss 2, blade 3, blade root 4.
Embodiment
Below by embodiment, the utility model will be further described by reference to the accompanying drawings.
Embodiment 1.
As shown in Fig. 1-7, the described leaving area 3.6m2 variable speed of the present embodiment air cooling industrial steam turbine low pressure stage group exhaust stage blade, it is a kind of variable cross section twisted blade, comprise blade 3, blade root 4 and for making blade form shroud 1 and the lacing wire boss of whole circle self-locking, the high Ld of described blade 3 relative leaf, by 0% monotone increasing to 100%, from the pitch to chord length of Dao Ye top section, blade root cross section than T/b Changing Pattern is: 0.4≤T/b≤1.0; From the pitch of Dao Ye top section, blade root cross section with blade profile cross section axial width than T/B Changing Pattern be: 0.4≤T/B≤3.5; From the pitch of Dao Ye top section, blade root cross section with blade profile cross section maximum ga(u)ge than T/Dmax Changing Pattern be: 2.5≤T/Dmax≤21.5; From the pitch of Dao Ye top section, blade root cross section with blade profile section area than T/A Changing Pattern be: 0.01≤T/A≤0.20; From the blade profile leading-edge radius R0 Changing Pattern of Dao Ye top section, blade root cross section be: 1.5mm≤R0≤1.8mm; From blade profile trailing edge radius R 1 Changing Pattern of Dao Ye top section, blade root cross section be: 1.2mm≤R1≤1.7mm.Wherein, described blade 3 is highly 580mm; Described blade root 4 is fir-tree root, and blade root 4 axial widths are 220mm, and blade pass is crossed fir-tree root 4 and is arranged in impeller groove, axially assembling; Described boss is elliptical table, boss centre distance blade 3 bottom 360mm; Described blade 3, its leading edge back of the body arc place is provided with the part of hardening, and the length of hardening is determined as required.
When static, blade is monolithic structure, and boss and shroud 1 are not all fitted, and under working speed, due to the effect of centrifugal force, blade 3 produces certain anti-twisted, makes generation positive pressure and frictional force between boss and boss, shroud 1 and shroud 1, has increased the damping of system; Make the whole circle of blade (as Fig. 7) in groups simultaneously, improve the vibration performance of blade.
The leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade of the utility model gained, blade adopts three-dimensional flow designing technique to design, width, thickness and the cross sectional area in cross section are reduced to top gradually by root, dullness seamlessly transits, there is certain distortion rule along the high direction blade of leaf, take into account the requirement of blade static strength, reasonable along the each thermal parameter regularity of distribution of blade, make blade there is good aeroperformance.Through professional computational fluid dynamics software CFX and Numeca checking, be that under the operating mode of 0.1bar, outlet Mach 2 ship 0.5, the pneumatic efficiency of place low pressure stage group is in 82% left and right in back pressure, peak rate of flow, more than 320t/h, has good off design performance simultaneously; Blade is the linear leaf that carries the whole circle self-locking damping of shroud 1 type, blade 3 middle and upper parts have boss, there is shroud 1 on leaf top, between each blade boss and all have the gap of 0.1-0.6mm between shroud 1, under working speed, due to the effect of centrifugal force, blade 3 produces certain anti-twisted, make laminating between boss and boss, shroud 1 and shroud 1 between blade, produce positive pressure and frictional force, increased the damping of system; Reach the whole circle self-locking structure of blade simultaneously, improve the vibration performance of blade, reduce the suffered dynamic stress of blade; Blade root 4 adopts fir-tree root design, and blade is easy to assembly, can be at back pressure 0.05bar ~ 0.25bar, and safe operation under rotating speed 3000rpm ~ 4000rpm, has wide market application foreground.
Claims (5)
1. a leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade, it is a kind of variable cross section twisted blade, comprise blade, blade root and for making blade form shroud and the lacing wire boss of whole circle self-locking, it is characterized in that the high Ld of the relative leaf of described blade, by 0% monotone increasing to 100%, from the pitch to chord length of Dao Ye top section, blade root cross section than T/b Changing Pattern is: 0.4≤T/b≤1.0; From the pitch of Dao Ye top section, blade root cross section with blade profile cross section axial width than T/B Changing Pattern be: 0.4≤T/B≤3.5; From the pitch of Dao Ye top section, blade root cross section with blade profile cross section maximum ga(u)ge than T/Dmax Changing Pattern be: 2.5≤T/Dmax≤21.5; From the pitch of Dao Ye top section, blade root cross section with blade profile section area than T/A Changing Pattern be: 0.01≤T/A≤0.20; From the blade profile leading-edge radius R0 Changing Pattern of Dao Ye top section, blade root cross section be: 1.5mm≤R0≤1.8mm; From blade profile trailing edge radius R 1 Changing Pattern of Dao Ye top section, blade root cross section be: 1.2mm≤R1≤1.7mm.
2. leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade according to claim 1, is characterized in that described blade height is 580mm.
3. leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade according to claim 2, is characterized in that described blade root is fir-tree root, and blade root axial width is 220mm.
4. according to the leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade described in claim 2 or 3, it is characterized in that described boss is elliptical table, boss centre distance blade bottom 360mm.
5. leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade according to claim 4, is characterized in that described blade, and its leading edge back of the body arc place is provided with the part of hardening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420415024.9U CN203948136U (en) | 2014-07-28 | 2014-07-28 | The low pressure stage group exhaust stage blade of leaving area 3.6m2 variable speed air cooling industrial steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420415024.9U CN203948136U (en) | 2014-07-28 | 2014-07-28 | The low pressure stage group exhaust stage blade of leaving area 3.6m2 variable speed air cooling industrial steam turbine |
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| CN203948136U true CN203948136U (en) | 2014-11-19 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196573A (en) * | 2014-07-28 | 2014-12-10 | 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 |
| CN106256993A (en) * | 2016-08-09 | 2016-12-28 | 杭州汽轮机股份有限公司 | A kind of final stage moving blade of feed pump 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 |
-
2014
- 2014-07-28 CN CN201420415024.9U patent/CN203948136U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196573A (en) * | 2014-07-28 | 2014-12-10 | 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 |
| CN106256993A (en) * | 2016-08-09 | 2016-12-28 | 杭州汽轮机股份有限公司 | A kind of final stage moving blade of feed pump 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 |
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