CN203809057U - Steam turbine final-stage long blade - Google Patents
Steam turbine final-stage long blade Download PDFInfo
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- CN203809057U CN203809057U CN201420062165.7U CN201420062165U CN203809057U CN 203809057 U CN203809057 U CN 203809057U CN 201420062165 U CN201420062165 U CN 201420062165U CN 203809057 U CN203809057 U CN 203809057U
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- 238000010168 coupling process Methods 0.000 claims description 22
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 230000003628 erosive effect Effects 0.000 claims description 16
- 239000011248 coating agent Substances 0.000 claims description 5
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- 230000007423 decrease Effects 0.000 abstract 4
- 239000000543 intermediate Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 229910001347 Stellite Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 206010011376 Crepitations Diseases 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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Abstract
The utility model provides a steam turbine final-stage long blade. The steam turbine final-stage long blade comprises a blade root, a middle body, a blade body and a shroud. The height C of the blade body is 1905 mm; in the height direction of the blade body, the relative value of the cross-sectional area of the blade body decreases gradually from 7.33 to 1.0, the relative value of the axial width W of the profile of the blade body decreases gradually from 5.61 to 1.0, the relative value of the circumferential width H of the profile of the blade body increases gradually from 1.0 to 1.67, the relative value of the chord length L of the profile of the blade body decreases from 1.40 to 1.0, the relative value of the maximum thickness TMAX of the profile of the blade body decreases gradually from 5.89 to 1.0, and the mounting angle a of the blade body increases gradually from 12 degrees to 76 degrees. The steam turbine final-stage long blade enlarges the steam exhaust area by enlarging the length, namely, the height of the blade, achieves a steam exhaust area up to 30 m2 and accordingly meets the application requirements of nuclear power steam turbines with different backpressures and different unit levels such as CAP1400/CAP1700 (China advanced passive 1400/1700).
Description
Technical field
The utility model relates to a kind of moving vane being arranged on turbine rotor, particularly relates to a kind of steam turbine final blade.
Background technique
Flourish along with China's Nuclear Electricity, the single-machine capacity of nuclear power generating sets is also progressively increasing, and all has corresponding unit in construction or in planning from 1000MW to 1700MW.Unit capacity is larger, and the quantity of low pressure (LP) cylinder and the total length of steam turbine also can be larger, and this will greatly affect the whole efficiency of steam turbine.At present, can reduce the quantity of low pressure (LP) cylinder and the total length of steam turbine by increasing the length of last stage vane of steam turbine.
Last stage vane of steam turbine is the core component of steam turbine, and particularly, for large capacity nuclear steam turbine, it is representing the technical merit of nuclear steam turbine.At present, the capacity of the Capacity Ratio 1000MW grade unit of third generation reactor unit has increased by 20%～80%, add coastal and in, the requirement of the low coolant water temperature in northern territory, third generation reactor unit needs larger leaving area requirement.In the Half Speed nuclear steam turbine putting into operation, final blades are leaving area 15-20m
2grade, steam passage height is 1400mm grade, its leaving area is less than normal, can not meet the requirement of third generation reactor nuclear steam turbine group.In order to meet the application demand of the nuclear steam turbine of the different back pressures such as CAP1400/CAP1700 and unit grade, each company is all at the linear leaf of concentrating strength on the larger leaving area of exploitation, but the problem due to aerodynamics and strength vibration aspect, limited again the length of exhaust stage blade, thus the leaving area of restriction exhaust stage blade.
Model utility content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of steam turbine final blade, to overcome in prior art because of the little defect that can not meet the nuclear steam turbine application demand of the different back pressures such as CAP1400/CAP1700 and unit grade of exhaust stage blade leaving area.
For achieving the above object, the utility model provides a kind of steam turbine final blade, comprises connected successively blade root, intermediate, blade and shroud, and the molded line of described blade is variable cross section distortion molded line, between adjacent two cross sections of blade, have relative torsion, the height C of described blade is 1905mm; Short transverse along blade, the relative value of blade section area is decreased to 1.0 gradually by 7.33, the relative value of blade molded line axial width W is decreased to 1.0 gradually by 5.61, the relative value of blade molded line circumferential width H increases to 1.67 gradually by 1.0, the relative value of blade molded line chord length L is decreased to 1.0 gradually by 1.40, the relative value of blade molded line maximum ga(u)ge TMAX is decreased to 1.0 gradually by 5.89, and established angle α is increased to 76 ° gradually by 12 °.
Preferably, the actual value of described blade section area is by 17600mm
2be decreased to gradually 2400mm
2the actual value of blade molded line axial width W is decreased to 77mm gradually by 432mm, the actual value of blade molded line circumferential width H increases to 306mm gradually by 183mm, the actual value of blade molded line chord length L is decreased to 315mm gradually by 442mm, and the actual value of blade molded line maximum ga(u)ge TMAX is decreased to 9mm gradually by 53mm.
Further, the axial width E of the axial width of described intermediate and blade root is identical, is 480mm; The height sum D of intermediate and blade root is 153.62mm.
Preferably, the axial width A of described shroud is 77.59mm, and the height B of shroud is 15～50mm.
Further, described blade root is the fir-tree root of Rouno Cormer Pregrinding Wheel, stress concentration.
Preferably, the both sides of described blade root bottom all offer locating slot.
Further, in described blade, being horizontally set with a cross section is oval boss, and this boss and blade are one-body molded, and described boss comprises the first coupling front end and the first coupling rear end.
Preferably, the upper end of described blade is provided with anti-water erosion district at admission avris, and described anti-water erosion district is coated in the surface of blade by laser melting coating.
As mentioned above, the steam turbine final blade that the utility model relates to, has following beneficial effect:
This steam turbine final blade increases the leaving area of exhaust stage blade by increasing the length (namely height) of blade, its leaving area is up to 30m
2, can meet the application demand of the different back pressures such as CAP1400/CAP1700, unit grade nuclear steam turbine.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the side view of Fig. 1.
Fig. 3 is blade molded line size schematic diagram.
Fig. 4 is the long-pending folded schematic diagram of blade molded line.
Fig. 5 is the plan view of intermediate.
Fig. 6 is the plan view of boss in the utility model.
Structural drawing when Fig. 7 is two boss couplings.
Fig. 8 is the plan view of shroud in the utility model.
Structural drawing when Fig. 9 is two shroud couplings.
Element numbers explanation
1 blade root
2 intermediates
3 blades
4 shrouds
41 second coupling front ends
42 second coupling rear ends
5 locating slots
6 boss
61 first coupling front ends
62 first coupling rear ends
7 anti-water erosion districts
8 leading edges
9 lagging edges
Embodiment
By particular specific embodiment, mode of execution of the present utility model is described below, person skilled in the art scholar can understand other advantages of the present utility model and effect easily by the disclosed content of this specification.
Notice, appended graphic the illustrated structure of this specification, ratio, size etc., equal contents in order to coordinate specification to disclose only, for person skilled in the art scholar, understand and read, not in order to limit the enforceable qualifications of the utility model, therefore the technical essential meaning of tool not, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under the effect that the utility model can produce and the object that can reach, all should still drop on the technology contents that the utility model discloses and obtain in the scope that can contain.Simultaneously, in this specification, quote as " on ", the term of D score, " left side ", " right side ", " centre " and " " etc., also only for ease of understanding of narrating, but not in order to limit the enforceable scope of the utility model, the change of its relativeness or adjustment, under without essence change technology contents, when being also considered as the enforceable category of the utility model.
The utility model provides a kind of leaving area can be up to 30m
2steam turbine final blade, as depicted in figs. 1 and 2, this steam turbine final blade comprises connected successively blade root 1, intermediate 2, blade 3 and shroud 4, and blade root 1, intermediate 2, blade 3 and shroud 4 are structure as a whole.Described blade 3 is for adopting the definite variable cross section twisted blade of full three dimensional design analytical method, the molded line of this blade 3 is variable cross section distortion molded line, along the short transverse of blade, the shape in adjacent two cross sections of blade 3 is different, and has relative torsion between adjacent two cross sections of blade 3.In the utility model, in order to improve the leaving area of final blades, the height C of described blade 3 is designed to 1905mm, this is highly the steam passage length of last stage vane of steam turbine.When increasing blade height (namely length of blade), also to make blade meet the designing requirement of the aspects such as aeroperformance, intensity, thus need to repeatedly revise the geometrical shape of blade in blade 3, that is repeatedly revise the molded line in blade 3 each cross sections.
As shown in Figure 3, blade molded line has following characteristic parameter:
Section area: the area in blade cross section;
Chord length L: the distance in blade cross section between leading edge 8 and lagging edge 9;
Maximum ga(u)ge TMAX: the tangential width in blade cross section;
Established angle α: chord length L and the axially angle of (X-direction).
In the application, through amended blade 3 each cross section molded line repeatedly, there is following characteristics: along the short transverse of blade 3, namely along blade root 1, arrive the direction of shroud 4, the relative value of blade section area is decreased to 1.0 gradually by 7.33, the relative value of blade molded line axial width W is decreased to 1.0 gradually by 5.61, the relative value of blade molded line circumferential width H increases to 1.67 gradually by 1.0, the relative value of blade molded line chord length L is decreased to 1.0 gradually by 1.40, the relative value of blade molded line maximum ga(u)ge TMAX is decreased to 1.0 gradually by 5.89, established angle α is increased to 76 ° gradually by 12 °.
Provide preferably embodiment of blade 3 one below:
Each cross section basic parameter of table 1
In above-described embodiment, along the short transverse of blade 3, the section area of blade is by 17600mm
2be decreased to gradually 2400mm
2the axial width W of blade molded line is decreased to 77mm gradually by 432mm, the circumferential width H of blade molded line increases to 306mm gradually by 183mm, the chord length L of blade molded line is decreased to 315mm gradually by 442mm, the maximum ga(u)ge TMAX of blade molded line is decreased to 9mm gradually by 53mm, established angle α is increased to 76 ° gradually by 12 °, and the molded line in each cross section as shown in Figure 4.In addition, in above-mentioned table 1, lagging edge 9 thickness refer to that each cross section molded line is at the thickness of lagging edge 9 sides of blade 3.
Further, as shown in Figure 1, the axial width E of the axial width of described intermediate 2 and blade root 1 is identical, is 480mm; The height sum D of intermediate 2 and blade root 1 is 153.62mm; The axial width A of described shroud 4 is 77.59mm, and the height B of shroud 4 is 15～50mm.
When this steam turbine final blade is installed, blade root 1 is arranged in the race of rotor, a circle amounts to 70 blades.In the present embodiment, described blade root 1 is the fir-tree root of side dress, Rouno Cormer Pregrinding Wheel, stress concentration, can reduce significantly stress and concentrate, and reduces the maximum stress of blade root 1 and race, to improve the strength character of anti-low cycle fatigue and stress corrosion resistant.Preferably, as shown in Figure 1 and Figure 5, the both sides of described blade root 1 bottom all offer locating slot 5, during assembling, can in locating slot 5, pack supporting bar into, to avoid blade axial float, guarantee the safe and stable operation of steam turbine.
Further, as shown in Figure 6 and Figure 7, in described blade 3, being horizontally set with a cross section is oval boss 6, this boss 6 is one-body molded with blade 3, described boss 6 comprises the first coupling front end 61 and the first coupling rear end 62, and the first coupling front end 61 and the first coupling rear end 62 are suitable, and the major axis F of described ellipse is 103mm, and minor axis G is 35mm.As shown in Figure 8 and Figure 9, described shroud 4 comprises the second coupling front end 41 and the second coupling rear end 42, and described the second coupling front end 41 and the second coupling rear end 42 are suitable.After these final blades being arranged in the race of turbine rotor, can leave the gap of 1-2mm between the shroud 4 of adjacent two blades and the working surface of boss 6, when static, blade is monolithic structure, under working speed, shroud 4 and the boss 6 of adjacent two blades twist under the effect of centrifugal force, the boss 6 of adjacent two blades is coupled by the first coupling rear end 62 and the first cooperatively interacting of front end 61 of coupling, the shroud 4 of adjacent two blades is coupled by the second coupling rear end 42 and the second cooperatively interacting of front end 41 of coupling, thereby making the gap between the shroud 4 of adjacent two blades and the working surface of boss 6 is 0, adjacent blades is connected into whole circle, and then the rigidity of raising blade, significantly reduce dynamic stress, frequency modulation exponent number is low, dynamic frequency effectively improves.
In addition, final blades are when work, because temperature, the pressure of low pressure (LP) cylinder are relatively low, wet vapor is in operation and easily condenses into little water droplet, under the effect of centrifugal force, little water droplet constantly impacts the leading edge 8 of blade, easily cause the water erosion of blade inlet edge 8, blade erosion can cause blade to occur cellular texture, when serious, can make blade inlet edge 8 edges present flexuose, form a lot of tiny crackles, even can make leaf top edge form breach, cause blade fatigue strength to reduce, affect unit safety.In order to solve blade inlet edge 8 water erosion problems, in the application, the upper end of described blade 3 is provided with anti-water erosion district 7 in leading edge 8 sides, and Gai Fang water erosion district 7 is between shroud 4 and boss 6, and described anti-water erosion district 7 is coated in the surface of blade 3 by laser melting coating.Described anti-water erosion district 7 adopts laser melting and coating techniques, and itself and conventional soldering stellite alloy film ratio, have the advantages such as laminating degree is good, difficult drop-off, to improve water erosion resistent ability.In addition, except anti-water erosion district 7 cladding layers, the remaining part of blade is all to adopt the alloyed steel solid forging of same high-intensity performance to form, thereby avoids the concentrated defect of stress, improves the safety reliability of blade.
In sum, the steam turbine final blade that the utility model relates to has the following advantages:
1, the leaving area of these final blades is up to 30m
2, be applicable to the nuclear steam turbines such as CAP1400/CAP1700, no matter be all to reach advanced world standards aspect Economy, safety reliability, and steam discharge loss obviously reduces, and under certain back pressure condition, can reduce by a low pressure (LP) cylinder, reduce investment, to power plant, bring great benefit;
2,1905mm final blades adopt advanced complete three-dimensional reaction blade design proposal, greatly reduce aerodynamic loss, and adopt large-scale full Three Dimensional Viscous flow field CFD software to carry out molded line to be optimized, and make this grade blade have good aerodynamic characteristic; Flow characteristic in moving vane runner is complicated, radially exists from subsonic speed-transonic speed-Supersonic Flow and changes; Stator blade is carried out to full three-dimensional optimized design, with most effective position target, dynamic and static leaf has best matching relationship simultaneously, is guaranteeing, under the prerequisite of safety reliability, to allow blade have best efficiency;
3, blade adopts advanced shroud, the whole circle self-locking damping of the boss structural type of carrying, with all the other structural type blade ratios of equal length grade, there is the features such as lightweight, frequency modulation exponent number is few, frequency stabliltiy good, anti-Flutter Performance is strong, can meet the Security moving under severe intensity environment;
4, in theory analysis examination, by setting up Special test rotor and blade in kind, move frequency modulation test and design detailed frequency modulation scheme, guarantee that blade has good vibration characteristics;
5, anti-water erosion measure is laser melting coating, and the soldering stellite alloy film ratio with conventional, has the advantages such as laminating degree is good, difficult drop-off, to improve water erosion resistent ability stability;
6, easy to assembly, utilize the reaction torque of centrifugal force to form whole circle self-locking damping, more reliable compared with the whole circle effect being formed by mechanical structure, be conducive to adjust and frequency modulation.
So the utility model has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any person skilled in the art scholar all can, under spirit of the present utility model and category, modify or change above-described embodiment.Therefore, have in technical field under such as and conventionally know that the knowledgeable modifies or changes not departing from all equivalences that complete under spirit that the utility model discloses and technological thought, must be contained by claim of the present utility model.
Claims (8)
1. a steam turbine final blade, comprise connected successively blade root (1), intermediate (2), blade (3) and shroud (4), the molded line of described blade (3) is variable cross section distortion molded line, between adjacent two cross sections of blade (3), have relative torsion, the height C of described blade (3) is 1905mm; Short transverse along blade (3), the relative value of blade section area is decreased to 1.0 gradually by 7.33, the relative value of blade molded line axial width W is decreased to 1.0 gradually by 5.61, the relative value of blade molded line circumferential width H increases to 1.67 gradually by 1.0, the relative value of blade molded line chord length L is decreased to 1.0 gradually by 1.40, the relative value of blade molded line maximum ga(u)ge TMAX is decreased to 1.0 gradually by 5.89, and established angle α is increased to 76 ° gradually by 12 °.
2. steam turbine final blade according to claim 1, is characterized in that: along the short transverse of blade (3), the actual value of described blade section area is by 17600mm
2be decreased to gradually 2400mm
2the actual value of blade molded line axial width W is decreased to 77mm gradually by 432mm, the actual value of blade molded line circumferential width H increases to 306mm gradually by 183mm, the actual value of blade molded line chord length L is decreased to 315mm gradually by 442mm, and the actual value of blade molded line maximum ga(u)ge TMAX is decreased to 9mm gradually by 53mm.
3. steam turbine final blade according to claim 1, is characterized in that: the axial width of described intermediate (2) is identical with the axial width E of blade root (1), is 480mm; The height sum D of intermediate (2) and blade root (1) is 153.62mm.
4. steam turbine final blade according to claim 1, is characterized in that: the axial width A of described shroud (4) is 77.59mm, and the height B of shroud (4) is 15～50mm.
5. steam turbine final blade according to claim 1, is characterized in that: described blade root (1) is the fir-tree root of Rouno Cormer Pregrinding Wheel, stress concentration.
6. steam turbine final blade according to claim 1 or 5, is characterized in that: the both sides of described blade root (1) bottom all offer locating slot (5).
7. steam turbine final blade according to claim 1, it is characterized in that: in described blade (3), being horizontally set with a cross section is oval boss (6), this boss (6) is one-body molded with blade (3), and described boss (6) comprises the first coupling front end (61) and the first coupling rear end (62).
8. steam turbine final blade according to claim 1, is characterized in that: the upper end of described blade (3) is provided with anti-water erosion district (7) in leading edge (8) side, and described anti-water erosion district (7) is coated in the surface of blade (3) by laser melting coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420062165.7U CN203809057U (en) | 2014-02-11 | 2014-02-11 | Steam turbine final-stage long blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420062165.7U CN203809057U (en) | 2014-02-11 | 2014-02-11 | Steam turbine final-stage long blade |
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| Publication Number | Publication Date |
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| CN203809057U true CN203809057U (en) | 2014-09-03 |
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| CN201420062165.7U Expired - Lifetime CN203809057U (en) | 2014-02-11 | 2014-02-11 | Steam turbine final-stage long blade |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103742203A (en) * | 2014-02-11 | 2014-04-23 | 上海电气电站设备有限公司 | Final-stage long blade of steam turbine |
| EP3153662A1 (en) * | 2015-10-09 | 2017-04-12 | General Electric Technology GmbH | Last stage rotor blades for half-speed nuclear steam turbine, corresponding circumferential row of such blades, their use, and process of manufacturing |
| CN109707462A (en) * | 2018-12-28 | 2019-05-03 | 东方电气集团东方汽轮机有限公司 | A kind of full rotary speed steam turbine 1450mm titanium alloy final blades |
-
2014
- 2014-02-11 CN CN201420062165.7U patent/CN203809057U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103742203A (en) * | 2014-02-11 | 2014-04-23 | 上海电气电站设备有限公司 | Final-stage long blade of steam turbine |
| CN103742203B (en) * | 2014-02-11 | 2016-04-27 | 上海电气电站设备有限公司 | Steam turbine final blade |
| EP3153662A1 (en) * | 2015-10-09 | 2017-04-12 | General Electric Technology GmbH | Last stage rotor blades for half-speed nuclear steam turbine, corresponding circumferential row of such blades, their use, and process of manufacturing |
| CN106870011A (en) * | 2015-10-09 | 2017-06-20 | 通用电器技术有限公司 | For the final stage rotor blade of Half Speed Large Copacity nuclear power turbine |
| CN109707462A (en) * | 2018-12-28 | 2019-05-03 | 东方电气集团东方汽轮机有限公司 | A kind of full rotary speed steam turbine 1450mm titanium alloy final blades |
| CN109707462B (en) * | 2018-12-28 | 2022-03-18 | 东方电气集团东方汽轮机有限公司 | 1450mm titanium alloy final-stage blade of full-speed steam turbine |
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