CN206458508U - Variable speed last-stage moving blade of air-cooled steam turbine - Google Patents
Variable speed last-stage moving blade of air-cooled steam turbine Download PDFInfo
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- CN206458508U CN206458508U CN201621402295.6U CN201621402295U CN206458508U CN 206458508 U CN206458508 U CN 206458508U CN 201621402295 U CN201621402295 U CN 201621402295U CN 206458508 U CN206458508 U CN 206458508U
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Abstract
The utility model provides a kind of variable speed last-stage moving blade of air-cooled steam turbine, is variable cross-section twisted blade, including shroud, blade and blade root；From the bottom of blade to top, the characteristic parameter of each characteristic cross-section is changed by following rule：Maximum gauge b is decreased to 4.10mm by 17.57mm dullnesses, and molded line width Wx is decreased to 47.78mm by 160.98mm dullnesses, and chord length c is by 166.39mm monotone decreasings to 103.57mm, and sectional area A is by 2336.58mm2Dullness is decreased to 346.58mm2, established angle a is decreased to 26.16 ° by 75.45 ° of dullnesses, and leading edge arc section radius r1 is decreased to 0.78mm by 3.16mm dullnesses, and lagging edge arc section radius r2 is decreased to 0.54mm by 2.17mm dullnesses.Maximum speed of the present utility model can reach 6000r/min.
Description
Technical field
The utility model is related to a kind of steam turbine blade, more particularly to a kind of variable speed air-cooled steam turbine last stage movable vane
Piece.
Background technology
Steam turbine blade is the important process part being assemblied on impeller.As domestic electrical industry is to variable speed air cooling
The demand of steam turbine is continuously increased, and higher and higher requirement is put forward to its high efficiency, security reliability.Variable speed air cooling vapour
Turbine is relative to wet type cooling unit, with the economy, the service requirement of security that back pressure is high, variable working condition scope is big and outstanding,
And these requirements are largely closely related with final stage moving blade, thus more limitations are proposed to final stage moving blade,
Ask in terms of must taking into account its heating power, aeroperformance and strength vibration characteristic.
At present, rarely has breakthrough on variable speed last-stage moving blade of air-cooled steam turbine both at home and abroad, rotating speed has focused largely on 3000
In the range of~5500r/min, it is difficult to reach higher rotating speed, higher end load can not be met.
The content of the invention
The shortcoming of prior art in view of the above, the technical problems to be solved in the utility model is that providing a kind of become turns
Fast last-stage moving blade of air-cooled steam turbine, to meet more high-revolving requirement, and disclosure satisfy that higher end load.
In order to solve the above-mentioned technical problem, the utility model provides a kind of variable speed last-stage moving blade of air-cooled steam turbine, is
Variable cross-section twisted blade, including shroud, blade and blade root, shroud are arranged at the top of blade, and blade root is arranged on blade bottom, institute
Blade is stated by multiple characteristic cross-sections from its bottom is to its top relative torsion and the area that smoothly transits is folded is formed, the characteristic cross-section
Joined end to end surrounded successively by inner arc curved section, lagging edge arc section, the curved line segment of the back of the body and leading edge arc section；
From the bottom of blade to top, the characteristic parameter of each characteristic cross-section is changed by following rule：Maximum gauge b by
17.57mm dullnesses are decreased to 4.10mm, and molded line width Wx is decreased to 47.78mm by 160.98mm dullnesses, and chord length c is by 166.39mm
Monotone decreasing is to 103.57mm, and sectional area A is by 2336.58mm2Dullness is decreased to 346.58mm2, established angle a is by 75.45 ° of dullnesses
Be decreased to 26.16 °, leading edge arc section radius r1 is decreased to 0.78mm by 3.16mm dullnesses, lagging edge arc section radius r2 by
2.17mm dullnesses are decreased to 0.54mm.
Preferably, the effective depth H of the blade is 500mm.
Preferably, the thickness h of the shroud is 8mm.
Preferably, the both sides of the blade are respectively equipped with the boss extended laterally, and the cross section of boss is ellipse, boss
It is integrally formed with blade.
Preferably, the major axis radius k of the boss end elliptical, minor axis radius j are respectively 7mm and 4mm.
Preferably, the boss is 300mm apart from L to blade bottom.
Preferably, the blade root is three tooth fir-tree roots, and its axial width W is 200mm, and established angle R is 14.4 °.
Preferably, it is additionally provided with intermediate between the blade and blade root.
Preferably, the shroud, the blade, the intermediate and the blade root are integrally formed.
Preferably, the curved line segment of the back of the body of the blade is provided with laser hardening part at leading edge.
As described above, variable speed last-stage moving blade of air-cooled steam turbine of the present utility model, has the advantages that：
1st, the utility model uses full Three -dimension flow designing technique, takes into account blade static strength so that in rated designs operating mode
Under, can in the range of 2200~6000r/min safe and reliable operation, and defined stage efficiency can be reached.
2nd, blade is designed using the structure type of whole circle interlocked blade, reduces blade from exciting and dynamic stress so that
Blade can reach 187.47t/ (hm in end load under maximum speed2)。
3rd, blade root uses three new tooth fir-tree types, significantly reduces the peak stress of blade root and blade root slot, further
Improve the security reliability of blade.
Brief description of the drawings
Fig. 1 is shown as structural representation of the present utility model.
Fig. 2 is shown as Fig. 1 side view.
Fig. 3 is shown as the structural representation of shroud.
Fig. 4 is shown as the coupling schematic diagram of two circumferentially-adjacent shrouds.
Fig. 5 is shown as the structural representation of boss section.
Fig. 6 is shown as the cooperation schematic diagram of two circumferentially-adjacent boss.
Fig. 7 is shown as the structural representation of intermediate.
Fig. 8 is shown as the structural representation of blade root.
Fig. 9 is shown as the characteristic parameter schematic diagram of the characteristic cross-section of blade.
Figure 10 is shown as the self-locking connection diagram of circumferentially-adjacent variable speed last-stage moving blade of air-cooled steam turbine.
Component label instructions
1 shroud
1a coupling front ends
1b couples rear end
2 boss
2a coordinates front end
2b coordinates rear end
3 blades
4 intermediates
5 blade roots
6 leading edges
7 lagging edges
The 8 curved line segments of the back of the body are at leading edge
9 leading edge arc sections
The 10 curved line segments of the back of the body
11 lagging edge arc sections
12 inner arc curved sections
The thickness of h shrouds
The height of H blades
With a distance from characteristic cross-section of the L boss from blade bottom
K major axis radius
J minor axis radius
The axial width of W blade roots
The established angle of R blade roots
The maximum gauge of b blades
The molded line width of Wx blades
The pitch of p blades
The chord length of c blades
The sectional area of A blades
The established angle of a blades
The leading edge arc section radius of r1 blades
The lagging edge arc section radius of r2 blades
Embodiment
Embodiment of the present utility model is illustrated by particular specific embodiment below, those skilled in the art can be by this
Content disclosed by specification understands other advantages of the present utility model and effect easily.
Fig. 1 is referred to Figure 10.It should be clear that structure, ratio, size depicted in this specification institute accompanying drawing etc., are only used
To coordinate the content disclosed in specification, so that those skilled in the art understands and reads, this practicality is not limited to new
The enforceable qualifications of type, therefore do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or size
Adjustment, in the case where not influenceing the utility model effect that can be generated and the purpose that can reach, all should still fall new in this practicality
In the range of technology contents disclosed in type can be covered.Meanwhile, in this specification it is cited as " on ", " under ", " left side ",
The term on " right side ", " centre " and " one " etc., is merely convenient to understanding for narration, and it is enforceable to be not used to restriction the utility model
Scope, being altered or modified for its relativeness is enforceable when being also considered as the utility model under without essence change technology contents
Category.
As shown in Fig. 1,2,9, the utility model provides a kind of variable speed last-stage moving blade of air-cooled steam turbine, is that variable cross-section is curved
Twisted blade, including shroud 1, blade 3 and blade root 5, shroud 1 are arranged on the top of blade 3, and blade root 5 is arranged on the bottom of blade 3, leaf
Body 3 is by multiple characteristic cross-sections from its bottom is to its top relative torsion and the area that smoothly transits is folded is formed, and characteristic cross-section is by inner arc
Curved section 12, lagging edge arc section 11, the curved line segment 10 of the back of the body and leading edge arc section 9 join end to end surround successively.
In the specific implementation, the height H of blade 3 is 500mm, the distance at the midpoint of the short transverse of blade 3 to impeller axis
It is 1340mm for 670mm, i.e. average diameter, and the circular passage area of the formation of blade 3 is 2.105m2.This blade also includes
Intermediate 4, intermediate 4 is located between blade 3 and blade root 5 as connection member.In addition, being set using special through-flow design program
The characteristic parameter and installation site of each characteristic cross-section of blade 3 have been counted, then it has been entered by full ternary pneumatic design software
Capable through-flow design optimization.The situation of the static strength of this blade is taken into account while each characteristic cross-section outstanding aeroperformance is ensured
Under, molded line width Wx, the sectional area A of characteristic cross-section are gradually reduced by the bottom of blade 3 to the top of blade 3, and characteristic cross-section edge
The short transverse of blade 3 seamlessly transits product and folded, and with certain relative torsion characteristic.As shown in figure 9, the characteristic cross-section of blade 3
Mainly there is following characteristics parameter：
Maximum gauge b：In characteristic cross-section, the maximum of the circle simultaneously tangent with carrying on the back curved line segment 10, inner arc curved section 12 is straight
Footpath；
Molded line width Wx：Width of the characteristic cross-section along impeller axial direction；
Pitch P：The circumferential spacing of adjacent blade 3；
Chord length c：The leading edge 6 of blade 3 and the spacing of lagging edge 7；
Sectional area A：The area of characteristic cross-section；
Established angle a：Direction where chord length c and the complementary angle of the angle of impeller axial direction；
Leading edge arc section radius r1：The radius of the profile of leading edge 6；
Lagging edge arc section radius r2：The radius of the profile of lagging edge 7.
From the bottom of blade 3 to the top of blade 3, the characteristic parameter of each characteristic cross-section is changed by following rule：Maximum gauge b
4.10mm is decreased to by 17.57mm dullnesses, molded line width Wx is decreased to 47.78mm by 160.98mm dullnesses, chord length c by
166.39mm monotone decreasings are to 103.57mm, and sectional area A is by 2336.58mm2Dullness is decreased to 346.58mm2, established angle a by
75.45 ° of dullnesses are decreased to 26.16 °, and leading edge arc section radius r1 is decreased to 0.78mm, lagging edge circular arc by 3.16mm dullnesses
Section radius r2 is decreased to 0.54mm by 2.17mm dullnesses, and pitch P is increased monotonically to 96.34mm by 43.98mm.
The utility model has the technical characterstics such as high rotating speed, high end load, high efficiency：There is this blade very high end to bear
While lotus tolerance, with outstanding aerodynamic characteristic.Calculated through Three -dimension flow, this blade is in back pressure 0.15bar, outlet Mach
Number is issued to peak efficiency for 0.6 operating mode.Declared working condition adjustable extent is adapted in 4500~6000r/min of rotating speed,
And can allow for the end load limit and reach 187.47t/ (hm2), its allow the range of speeds of normal operating condition for 2200~
6000r/min；Reasonable in design, blade is easy to assembly, and strength grade is high, and usable range is big, is applied with wide market
Prospect.
In preferred embodiment, as shown in Figure 2,3, the two ends of shroud 1 are provided with coupling front end 1a and coupling rear end 1b, shroud 1
Thickness h be 8mm；As shown in Fig. 2,5, the both sides of blade 3 are respectively equipped with the boss 2 extended laterally, and the cross section of boss 2 is ellipse
Circle, boss 2 is 300mm from the bottom distance L of blade 3, and boss 2 is integrally formed with blade 3, before the two ends of boss 2 are provided with coordinating
Hold 2a and coordinate rear end 2b, the cooperation front end 2a and cooperation rear end 2b of boss 2 are that major axis radius k, minor axis radius j are respectively
7mm and 4mm ellipse.
This blade using whole circle interlocked blade structure type, by the shape of shroud 1 and thickness and boss 2
Shape and the optimization design of position, are finally obtained outstanding strength vibration characteristic, improve the strength vibration characteristic of this blade.
In the specific implementation, as shown in Fig. 4,6,10, this blade is to carry shroud 1, the whole circle self-locking of boss 2 to come into leaves
It is in fit-state, boss 2 between the coupling front end 1a and coupling rear end 1b of the shroud 1 of circumferentially-adjacent two blades under piece, static state
Cooperation front end 2a and coordinate rear end 2b between gap be 0.25mm；During work, the gap of shroud 1 is between 0mm, boss 2
Gap is also 0mm.Under the influence of centrifugal force, this blade can produce anti-twisted, and the anti-twisted coupling front end 1a that can make shroud 1 and coupling
Rear end 1b intercouples, while can also make the cooperation front end 2a of boss 2 and coordinate rear end 2b to cooperate, so as to produce contact force
And frictional force, the damping between blade is added, the effect of whole circle self-locking is reached.Whole circle self-locking has advantages below：Increase leaf
The rigidity of chip level, heightens resonance pitch diameter, and damping can minimize self-excited vibration, further reduce dynamic stress.
In preferred embodiment, as shown in Fig. 2,7,8, blade root 5 is three tooth fir-tree roots, and it mainly has following characteristics ginseng
Number：
Axial width W：Width of the blade root 5 along impeller axial direction；
Established angle R：The length direction of intermediate 4 and the angle of impeller axial direction.
In order to further reduce blade root 5, wheel rim peak stress to improve the low-cycle fatigue life of blade, existing three
On the basis of tooth fir-tree root, the full-scale optimization of blade root 5 is carried out using finite element technique.Comprehensive blade root 5 and the blade root of impeller
Groove (is used to assemble the installation opening of this blade) contact area, the fit clearance of blade root 5 and blade root slot, blade root 5 each tooth on impeller
Fillet size and each tooth the reference feature such as stress concentration, the item that optimizes of blade root 5 is optimized, while considering leaf
Root 5, the mean stress of blade root slot and the encapsulation for blade 3, obtain three new tooth fir-tree roots, its axial width
W is 200mm, and established angle R is 14.4 °.It is so designed that, reduces the peak stress of the blade root slot of impeller, further increases this
The security reliability of blade, enables blade in the range of 2200~6000r/min of rotating speed and reaches 187.47t/ in end load
(h·m2) operating mode under safe operation, with wide market application foreground.
In preferred embodiment, shroud 1, blade 3, intermediate 4 and blade root 5 are integrally formed.It is so designed that, it is to avoid whole
The residual stress of the welding of individual blade.
In preferred embodiment, as shown in Figure 5, it is considered to influence of the water erosion to blade construction, the curved line segment of the back of the body of blade 3 is leaned on
8 are provided with laser hardening part at nearly leading edge.In the specific implementation, hardening height is decided according to the actual requirements.
In summary, maximum speed of the present utility model can reach 6000r/min, and disclosure satisfy that higher end is born
Lotus.So, the utility model effectively overcomes various shortcoming of the prior art and has high industrial utilization.
Above-described embodiment only illustrative principle of the present utility model and its effect are new not for this practicality is limited
Type.Any person skilled in the art can all be carried out without prejudice under spirit and scope of the present utility model to above-described embodiment
Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the essence disclosed in the utility model
God and all equivalent modifications completed under technological thought or change, should be covered by claim of the present utility model.
Claims (10)
1. it is variable cross-section twisted blade a kind of variable speed last-stage moving blade of air-cooled steam turbine, including shroud, blade and blade root,
Shroud is arranged at the top of blade, and blade root is arranged on blade bottom, and the blade is by multiple characteristic cross-sections from its bottom to its top
Relative torsion and the area that smoothly transits are folded to be formed, the characteristic cross-section by inner arc curved section, lagging edge arc section, carry on the back curved line segment
And leading edge arc section joins end to end surround successively；It is characterized in that：
From the bottom of blade to top, the characteristic parameter of each characteristic cross-section is changed by following rule：Maximum gauge b by
17.57mm dullnesses are decreased to 4.10mm, and molded line width Wx is decreased to 47.78mm by 160.98mm dullnesses, and chord length c is by 166.39mm
Monotone decreasing is to 103.57mm, and sectional area A is by 2336.58mm2Dullness is decreased to 346.58mm2, established angle a is by 75.45 ° of dullnesses
Be decreased to 26.16 °, leading edge arc section radius r1 is decreased to 0.78mm by 3.16mm dullnesses, lagging edge arc section radius r2 by
2.17mm dullnesses are decreased to 0.54mm.
2. variable speed last-stage moving blade of air-cooled steam turbine according to claim 1, it is characterised in that：The blade it is effective
Height H is 500mm.
3. variable speed last-stage moving blade of air-cooled steam turbine according to claim 1, it is characterised in that：The thickness of the shroud
H is 8mm.
4. variable speed last-stage moving blade of air-cooled steam turbine according to claim 1, it is characterised in that：The both sides of the blade
The boss extended laterally is respectively equipped with, the cross section of boss is ellipse, and boss is integrally formed with blade.
5. variable speed last-stage moving blade of air-cooled steam turbine according to claim 4, it is characterised in that：The boss end is ellipse
Round major axis radius k, minor axis radius j is respectively 7mm and 4mm.
6. variable speed last-stage moving blade of air-cooled steam turbine according to claim 4, it is characterised in that：The boss is to blade
Bottom apart from L be 300mm.
7. variable speed last-stage moving blade of air-cooled steam turbine according to claim 1, it is characterised in that：The blade root is three teeth
Fir-tree root, its axial width W is 200mm, and established angle R is 14.4 °.
8. variable speed last-stage moving blade of air-cooled steam turbine according to claim 1, it is characterised in that：The blade and blade root
Between be additionally provided with intermediate.
9. variable speed last-stage moving blade of air-cooled steam turbine according to claim 8, it is characterised in that：It is the shroud, described
Blade, the intermediate and the blade root are integrally formed.
10. variable speed last-stage moving blade of air-cooled steam turbine according to claim 1, it is characterised in that：The back of the body of the blade
Curved line segment is provided with laser hardening part at leading edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621402295.6U CN206458508U (en) | 2016-12-20 | 2016-12-20 | Variable speed last-stage moving blade of air-cooled steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621402295.6U CN206458508U (en) | 2016-12-20 | 2016-12-20 | Variable speed last-stage moving blade of air-cooled steam turbine |
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| Publication Number | Publication Date |
|---|---|
| CN206458508U true CN206458508U (en) | 2017-09-01 |
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ID=59697351
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|---|---|---|---|
| CN201621402295.6U Active CN206458508U (en) | 2016-12-20 | 2016-12-20 | Variable speed last-stage moving blade of air-cooled steam turbine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108204249A (en) * | 2016-12-20 | 2018-06-26 | 上海汽轮机厂有限公司 | Variable speed last-stage moving blade of air-cooled steam turbine |
| CN108374691A (en) * | 2018-02-11 | 2018-08-07 | 杭州汽轮机股份有限公司 | A kind of industrial steam turbine final stage moving blade of variable speed big flow |
| CN109707461A (en) * | 2018-08-22 | 2019-05-03 | 杭州汽轮机股份有限公司 | A kind of high revolving speed high load capacity last stage movable vane of industrial steam turbine |
-
2016
- 2016-12-20 CN CN201621402295.6U patent/CN206458508U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108204249A (en) * | 2016-12-20 | 2018-06-26 | 上海汽轮机厂有限公司 | Variable speed last-stage moving blade of air-cooled steam turbine |
| CN108374691A (en) * | 2018-02-11 | 2018-08-07 | 杭州汽轮机股份有限公司 | A kind of industrial steam turbine final stage moving blade of variable speed big flow |
| CN108374691B (en) * | 2018-02-11 | 2024-03-29 | 杭州汽轮动力集团股份有限公司 | Variable-rotation-speed high-flow industrial turbine last-stage moving blade |
| CN109707461A (en) * | 2018-08-22 | 2019-05-03 | 杭州汽轮机股份有限公司 | A kind of high revolving speed high load capacity last stage movable vane of industrial steam turbine |
| CN109707461B (en) * | 2018-08-22 | 2024-02-23 | 杭州汽轮动力集团股份有限公司 | High-rotation-speed high-load final-stage movable blade for industrial steam turbine |
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