CN103498749B - A kind of small-scale mixed-flow pump turbine for low water head pumped storage power station - Google Patents
A kind of small-scale mixed-flow pump turbine for low water head pumped storage power station Download PDFInfo
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- CN103498749B CN103498749B CN201310449603.5A CN201310449603A CN103498749B CN 103498749 B CN103498749 B CN 103498749B CN 201310449603 A CN201310449603 A CN 201310449603A CN 103498749 B CN103498749 B CN 103498749B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The present invention relates to a kind of small-scale mixed-flow pump turbine for low water head pumped storage power station, it is characterized in that the cornerite of runner bucket is 105 ° ~ 124 °, the angle of inlet edge of runner blade and outlet edge is 54 ° ~ 86 °, runner bucket is space three-dimensional distortion curved surface, in vertical bone line direction, thickness is equal, the molded line of runner bucket is crescent shape, runner bucket inlet height B1 ratio under runner bucket thickness and hydraulic turbine condition is 0.06 ~ 0.11, runner bucket inlet height B1 under hydraulic turbine condition is equal with guide vane height B2, stator aerofoil profile is symmetrical whale shape, on label and be provided with three uniform vents, spiral case axial cross section is circular cross-section, draft tube is bending elbow type, its flat segments axial cross section is circular cross-section.The present invention both can meet the contrary pumping for water pump operating mode of twice water (flow) direction and water turbine generating operation mode, and can meet again pump turbine all can Effec-tive Function under two kinds of operating conditionss.
Description
Technical field
The invention belongs to hydraulic machinery technical field, particularly relate to a kind of small-scale mixed-flow pump turbine for low water head pumped storage power station.
Background technique
Along with rapid expansion and the development of electric power system, effect of peak regulation, frequency modulation, phase modulation and emergency duty etc. that pumped storage power station is served as in electric power system is more and more significant.Pump-storage generator is the main unit of pumped storage power station, and pumped storage type mainly can the Reversible Pump-Turbine of way traffic at present, and it has the effect of water turbine and water pump concurrently.At present, middle high head and Large Copacity pump turbine have had more deep research at home and abroad, have accumulated numerous experience such as Design and optimization, operation, achieve good achievement.Meanwhile, the exploitation of the new energy such as such as solar energy, wind energy, tidal energy is also that imposing manner is thriving, but the unstability of these energy and discontinuity, bring very large difficulty to comprehensive utilization and convenience-for-people life.In order to ensure the Appropriate application of the stable of electric power system and the energy, in the little electric power system that comprehensive multiple-energy-source utilizes, pumped storage power station can be utilized to regulate, and general head can not more than 50m.In known technology, to small-sized low water head mixed flow pump turbine research seldom, owing to again to the design of the Hydraulic Design of bending elbow type draft tube this runner, high performance runner bucket and optimization and unit general structure layout lacking design experiences via stator to runner to from spiral case, such that this structure is simple, conservancy property is good, installation and maintenance are convenient, required upper storage reservoir and the few reversible unit of small-scale mixed-flow of lower storage reservoir excavated volume do not obtain due exploitation and popularization.
Chinese patent application 200810010743.1 discloses one " pump turbine ", this solution provides a microminiature pump turbine that structure is simple, cost is low, flow is little, volume is little, but its deficiency is, one will change runner when being and hydraulic turbine condition and pump operating condition are carried out exchange work, runs bring great restriction to continuous seepage; Two is that the manufacturing process of this airfoil fan is extremely complicated, and dimensional accuracy is difficult to ensure, directly affects operational efficiency.
Chinese patent application 201310049897.2 discloses " a kind of low water head axle extend through flow type pump turbine and blade thereof ", the program comprises pump turbine, reversible electric machine, runner and deflector, water turbine generating and pumping for water pump two kinds of operating conditionss can be met simultaneously, be applicable to low water head pumped storage power station.But also exist following obviously not enough: one is that axle extend through flow type pump turbine adopts straight curved draft tube, and tail water energy recovery efficiency is low, causes the efficiency of whole unit to reduce; Two is that axle extend through flow type pump turbine axis is long, shaft seal is difficult and ambient noise large, and runs and maintenance inconvenience, therefore generally can only be applied to small unit; Three is that the processing difficulties of runner bucket and stator, complex structure and cost are high.
How to overcome the deficiencies in the prior art, make full use of China's waterpower resourses, guarantee the stable operation of electrical network, exploitation and the reversible unit of popularization low water head small-scale mixed-flow have become one of emphasis difficult problem urgently to be resolved hurrily in current hydraulic machinery technical field further.
Summary of the invention
The object of the invention is to provide a kind of small-scale mixed-flow pump turbine for low water head pumped storage power station for overcoming the deficiencies in the prior art, the present invention both can meet the contrary pump turbine pumping operation mode of twice water (flow) direction and generating operation mode, namely same runner meets the dual requirements drawing water and generate electricity simultaneously, and can meet again pump turbine all can Effec-tive Function under two kinds of operating conditionss.
According to a kind of small-scale mixed-flow pump turbine for low water head pumped storage power station that the present invention proposes, it comprises spiral case, draft tube, runner envelope, stator, upper cover, runner, seat ring and bearing (ball) cover, wherein: spiral case, stator, runner is connected successively with draft tube, and runner comprises runner bucket, lower ring, crown and draft cone, upper cover is arranged on runner, and bearing (ball) cover is arranged on and covers, and it is characterized in that the cornerite of runner bucket is 105 ° ~ 124 °, and the angle of inlet edge of runner blade and outlet edge is 54 ° ~ 86 °, and runner bucket is space three-dimensional distortion curved surface, in vertical bone line direction, thickness is equal, the molded line of runner bucket is crescent shape, runner bucket inlet height B1 ratio under runner bucket thickness and hydraulic turbine condition is 0.06 ~ 0.11, runner bucket inlet height B1 under hydraulic turbine condition is equal with guide vane height B2, stator aerofoil profile is symmetrical whale shape, and above label and be provided with three uniform vents, spiral case axial cross section is circular cross-section, draft tube is bending elbow type, and its flat segments axial cross section is circular cross-section.
Working principle of the present invention is: in the operating unit of low water head pumped storage power station, comprise reversible electric machine and small-scale mixed-flow pump turbine of the present invention, reversible electric machine is with generator and motor dual functions, and pump turbine is with water turbine and water pump dual functions.The operation of pump turbine can be divided into two kinds of operating modes, i.e. hydraulic turbine condition and pump operating condition, and wherein the water of upper storage reservoir is put into lower storage reservoir by pump turbine by hydraulic turbine condition, and the potential energy of water is converted to electric energy; Pump operating condition utilizes electric energy that the water extraction of lower storage reservoir is raised to upper storage reservoir, produces water potential.The conversion process of energy of two kinds of operating modes refers to Fig. 2, and when other energy such as electric power are abundant, this unit is operated in pump operating condition, lower storage reservoir (17) water is evacuated to upper storage reservoir (14) and saves as water potential; When other energy such as electric power lack, this unit is operated in hydraulic turbine condition, produces electric energy, thus guarantees the stability of power supply.
The present invention compared with prior art its remarkable advantage is: one be for guarantee low water head pumped storage power station under pump operating condition and hydraulic turbine condition can both Effec-tive Function, smooth and easy and flow passage resistance force of waterproof loss of flowing little, the present invention adopts crescent shape molded line blade, this blade is space three-dimensional distortion curved surface, in vertical bone line direction, thickness is equal, and stator aerofoil profile is symmetrical whale shape; Two is requirements that runner can meet two-way operating mode, namely as much as possible under pump operating condition current is evacuated to upper pond, obtains more water potential, under hydraulic turbine condition, is converted to electric energy by as much as possible for water potential; Three is adopt bending elbow type draft tube, and tail water energy recovery efficiency is high, in addition the blade of above-mentioned new design and the comprehensive synergy of stator, makes the energy conversion efficiency of this pump turbine of the present invention under two kinds of operating modes to reach more than 85%; Four be that the structure of blade of the present invention and stator is simple, easy processing and cost low, and noise very little on environment without impact; Five is low water head pumped storage power stations that the present invention is applicable to 10m ~ 15m, and flow is little, and required upper and lower reservoir excavated volume is few, and civilwork engineering quantity is little, makes unit overall cost reduce by more than 20% than existing unit.
Accompanying drawing explanation
Fig. 1 is the structural profile schematic diagram of small-scale mixed-flow pump turbine of the present invention.
Fig. 2 is the energy conversion relation schematic diagram under the operating two kinds of operating modes of drawing water and generate electricity of the present invention.
Fig. 3 is the runner schematic top plan view of small-scale mixed-flow pump turbine of the present invention.
Fig. 4 is the runner bucket schematic top plan view of small-scale mixed-flow pump turbine of the present invention.
Fig. 5 is runner bucket five schematic cross-sections of small-scale mixed-flow pump turbine of the present invention.
Fig. 6 is the spiral case schematic top plan view of small-scale mixed-flow pump turbine of the present invention.
Fig. 7 is the stator schematic top plan view of small-scale mixed-flow pump turbine of the present invention.
Fig. 8 is the bending elbow type draft tube schematic front view of small-scale mixed-flow pump turbine of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
Composition graphs 1, Fig. 3, Fig. 7, a kind of small-scale mixed-flow pump turbine for low water head pumped storage power station that the present invention proposes, it comprises spiral case (1), draft tube (4), runner envelope (5), stator (6), upper cover (7), runner (9), seat ring (12) and bearing (ball) cover (13), wherein: spiral case (1), stator (6), runner (9) is connected successively with draft tube (4), runner (9) comprises runner bucket (2), lower ring (3), crown (8) and draft cone (19), upper cover (7) is arranged on runner (9), bearing (ball) cover (13) is arranged on upper cover (7), the cornerite of described runner bucket (2) is 105 ° ~ 124 °, runner bucket (2) water inlet limit (11) is 54 ° ~ 86 ° with the angle of outlet edge (10), runner bucket (2) is space three-dimensional distortion curved surface, in vertical bone line direction, thickness is equal, the molded line of runner bucket (2) is crescent shape, runner bucket (2) inlet height B1 ratio under runner bucket (2) thickness and hydraulic turbine condition is 0.06 ~ 0.11, runner bucket (2) inlet height B1 under hydraulic turbine condition is equal with stator (6) height B 2, described stator (6) aerofoil profile is symmetrical whale shape, described crown (8) is provided with three uniform vents (18), described spiral case (1) axial cross section is circular cross-section, described draft tube (4) is bending elbow type, its flat segments axial cross section is circular cross-section.
The further preferred version of the present invention is: described runner bucket (2) is space three-dimensional distortion curved surface, refer to and divide equally intercepting five cross sections on runner bucket (2) short transverse position, after ten curves in these five cross sections, equation is as follows:
Cross section 1:
A:y＝-8.1873×10
-7x
4+3.3151×10
-4x
3-0.0550x
2+4.3443x-7.0786；
B:y＝-7.0371×10
-7x
4-2.8457×10
-4x
3-0.0477x
2+3.8439x+9.0093；
Cross section 2:
C:y＝-8.3253×10
-7x
4+3.3913×10
-4x
3-0.0569x
2+4.5383x-10.2586；
D:y＝-7.1166×10
-7x
4+2.8906×10
-4x
3-0.0490x
2+3.9749x+8.3510；
Cross section 3:
E:y＝-7.9770×10
-7x
4+3.2027×10
-4x
3-0.0532x
2+4.1926x+5.0454；
F:y＝-5.8482×10
-7x
4+2.3309×10
-4x
3-0.0403x
2+3.3553x+28.7474；
Cross section 4:
G:y＝-6.2045×10
-7x
4+2.4262×10
-4x
3-0.0409x
2+3.3220x+31.7707；
H:y＝-5.6279×10
-7x
4+2.2104×10
-4x
3-0.0376x
2+3.0802x+42.6535；
Cross section 5:
I:y＝-6.3436×10
-7x
4+2.4662×10
-4x
3-0.0410x
2+3.2495x+40.6523；
J:y＝-5.4378×10
-7x
4+2.0954×10
-4x
3-0.0351x
2+2.8187x+56.5296；
Described runner bucket (2) number is 5 ~ 8; Described runner (9) height B 3 and the runner bucket (2) under hydraulic turbine condition limit (11) diameter ratio of intake is 0.366 ~ 0.407, and runner bucket (2) outlet edge (10) the diameter D4 under hydraulic turbine condition is 0.538 ~ 0.578 with limit (11) diameter D0 ratio of intaking; Described spiral case (1) section area circumferentially direction variation tendency equation is: y=-121.8016+4446.2x, and spiral case (1) cornerite is 318 ° ~ 337 °, as shown in Figure 6; Described stator (6) is distributed in seat ring (12) with single-row circular pattern, runner bucket (2) under stator (6) pitch circle diameter and hydraulic turbine condition limit (11) diameter ratio of intaking is 0.855 ~ 0.861, runner bucket (2) under stator (6) throat diameter and hydraulic turbine condition limit (11) diameter ratio of intaking is 0.124 ~ 0.131, stator (6) number is 21, and the curved dies of stator (6) is y=-1.0185 × 10
-4x
3+ 0.0115x
2+ 0.3339x+124.6627; The right cone section angle of flare of described draft tube (4) is 13 °, as shown in Figure 8; Runner bucket (2) outlet edge (10) diameter D7 under described hydraulic turbine condition is 1.661 ~ 1.812 with the ratio of water inlet limit (11) diameter D4; The aperture that described crown (8) is provided with three uniform vents (18) is 10mm.
Composition graphs 2, now to be designed for the small-scale mixed-flow pump turbine of two kinds of operating modes of drawing water and generate electricity, the unit of its two kinds of operating conditionss that draw water and generate electricity and small-scale mixed-flow pump turbine critical piece and design parameter are: this unit comprises reversible electric machine MG (16), small-scale mixed-flow pump turbine PT (20), valve (15), diversion mechanism, deflector and runner, described runner comprises once through spiral case (1) runner, via the runner of stator (6), runner (9) runner and draft tube (4) runner; Described reversible electric machine (16), on the upside of pump turbine, is connected with pump turbine by main shaft; Runner (9) is arranged in runner envelope (5), upper cover (7) above runner, runner (9) comprises runner bucket (2), lower ring (3), crown (8) and draft cone (19), three uniform vents (18) are provided with at crown (8) place, the shape of described runner bucket (2) is equal at vertical bone line direction thickness, runner bucket (2) meets the designing requirement of Francis turbine and mixed flow pump, takes into account water turbine and water pump two kinds of operating conditionss; As shown in Figure 3, runner (9) diameter is 250mm, runner bucket (2) number is 6, stator (6) throat diameter is 32.2mm, stator (6) number is 21, and spiral case (1) axial cross section is circular cross-section, and spiral case (1) import diameter of section is 250mm, draft tube (4) import diameter of section is 142mm, and exit diameter is 250mm; Runner bucket (2) as shown in Figure 4, for space three-dimensional distortion curved surface, have employed crescent shape molded line, its spatial character is represented by five cross sections, getting runner rotating center is benchmark, A, B, C, D, E, F, G, H, I and J represent curve, as shown in Figure 5, Ax, Bx, Cx, Dx, Ex, Fx, Gx, Hx, Ix and Jx are the abscissa of corresponding points on curve, Ay, By, Cy, Dy, Ey, Fy, Gy, Hy, Iy and Jy are the y coordinate of corresponding points on curve, and position in rectangular coordinate system, five cross sections is expressed as follows by part point coordinates:
Cross section 1
| Numbering | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Ax | 42.5 | 45 | 55 | 65 | 75 | 85 | 95 | 105 | 115 |
| Ay | 101.8 | 104.4 | 112.9 | 118.9 | 123.3 | 126.1 | 127.5 | 127.7 | 127.3 |
| Bx | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 110 | 120 |
| By | 103.51 | 112.88 | 119.67 | 124.58 | 127.96 | 129.99 | 130.78 | 130.36 | 128.71 |
| Numbering | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| Ax | 125 | 135 | 145 | 155 | 165 | 175 | 180 | ||
| Ay | 124.3 | 120.5 | 115 | 107.3 | 96.48 | 79.42 | 63.63 | ||
| Bx | 130 | 140 | 150 | 160 | 170 | 180 | 182.5 | ||
| By | 125.75 | 121.33 | 115.16 | 106.69 | 94.68 | 74.8 | 65.97 |
Cross section 2:
| Numbering | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Cx | 42.5 | 45 | 55 | 65 | 75 | 85 | 95 | 105 | 115 |
| Cy | 103.93 | 106.71 | 115.76 | 122.21 | 126.69 | 129.13 | 130.96 | 131.02 | 129.75 |
| Dx | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 110 | 120 |
| Dy | 106.3 | 116.16 | 123.24 | 128.31 | 131.73 | 133.71 | 134.37 | 133.75 | 131.83 |
| Numbering | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| Cx | 125 | 135 | 145 | 155 | 165 | 175 | 180 | ||
| Cy | 127.09 | 122.91 | 116.99 | 108.82 | 97.4 | 79.65 | 63.78 | ||
| Dx | 130 | 140 | 150 | 160 | 170 | 180 | 182.5 | ||
| Dy | 128.54 | 123.73 | 117.09 | 108.09 | 95.45 | 74.91 | 66.14 |
Cross section 3:
| Numbering | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Ex | 42.5 | 45 | 55 | 65 | 75 | 85 | 95 | 105 | 115 |
| Ey | 110.07 | 112.41 | 120.4 | 126.16 | 130.13 | 129.55 | 133.62 | 133.36 | 131.79 |
| Fx | 42.5 | 45 | 55 | 65 | 75 | 85 | 95 | 105 | 115 |
| Fy | 115.11 | 117.33 | 124.68 | 130.03 | 133.73 | 136 | 136.95 | 136.64 | 135.08 |
| Numbering | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| Ex | 125 | 135 | 145 | 155 | 165 | 175 | 180 | ||
| Ey | 128.83 | 124.37 | 118.13 | 109.64 | 97.86 | 79.71 | 63.77 | ||
| Fx | 125 | 135 | 145 | 155 | 165 | 175 | 180 | 182.5 | |
| Fy | 132.19 | 127.88 | 121.9 | 113.85 | 102.91 | 86.96 | 74.88 | 66.11 |
Cross section 4:
| Numbering | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Gx | 42.5 | 45 | 55 | 65 | 75 | 85 | 95 | 105 | 115 |
| Gy | 116.55 | 118.3 | 125.26 | 130.31 | 133.74 | 135.75 | 136.43 | 135.83 | 133.94 |
| Hx | 42.5 | 45 | 55 | 65 | 75 | 85 | 95 | 105 | 115 |
| Hy | 121.35 | 123.26 | 129.65 | 134.31 | 137.47 | 139.3 | 139.87 | 139.22 | 137.33 |
| Numbering | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| Gx | 125 | 135 | 145 | 155 | 165 | 175 | 180 | ||
| Gy | 130.68 | 125.91 | 119.35 | 110.51 | 98.35 | 79.76 | 63.76 | ||
| Hx | 125 | 135 | 145 | 155 | 165 | 175 | 180 | 182.5 | |
| Hy | 134.14 | 129.51 | 123.21 | 114.82 | 103.51 | 87.14 | 74.86 | 66.09 |
Cross section 5:
| Numbering | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Ix | 45 | 55 | 65 | 75 | 85 | 95 | 105 | 115 | 125 |
| Iy | 124.35 | 130.32 | 134.66 | 137.54 | 139.09 | 139.38 | 138.43 | 136.21 | 132.63 |
| Jx | 42.5 | 45 | 55 | 65 | 75 | 85 | 95 | 105 | 115 |
| Jy | 127.83 | 129.43 | 134.87 | 138.83 | 141.44 | 142.8 | 142.97 | 141.96 | 139.73 |
| Numbering | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| Ix | 135 | 145 | 155 | 165 | 175 | 180 | |||
| Iy | 127.53 | 120.64 | 111.43 | 98.86 | 79.82 | 63.75 | |||
| Jx | 125 | 135 | 145 | 155 | 165 | 175 | 180 | ||
| Jy | 136.21 | 131.25 | 124.62 | 115.86 | 104.15 | 87.32 | 74.84 |
After ten curves in described five cross sections, equation is as follows:
Cross section 1:
A:y＝-8.1873e-07x
4+3.3151e-04x
3-0.0550x
2+4.3443x-7.0786；
B:y＝-7.0371e-07x
4-2.8457e-04x
3-0.0477x
2+3.8439x+9.0093；
Cross section 2:
C:y＝-8.3253e-07x
4+3.3913e-04x
3-0.0569x
2+4.5383x-10.2586；
D:y＝-7.1166e-07x
4+2.8906e-04x
3-0.0490x
2+3.9749x+8.3510；
Cross section 3:
E:y＝-7.9770e-07x
4+3.2027e-04x
3-0.0532x
2+4.1926x+5.0454；
F:y＝-5.8482e-07x
4+2.3309e-04x
3-0.0403x
2+3.3553x+28.7474；
Cross section 4:
G:y＝-6.2045e-07x
4+2.4262e-04x
3-0.0409x
2+3.3220x+31.7707；
H:y＝-5.6279e-07x
4+2.2104e-04x
3-0.0376x
2+3.0802x+42.6535；
Cross section 5:
I:y＝-6.3436e-07x
4+2.4662e-04x
3-0.0410x
2+3.2495x+40.6523；
J:y＝-5.4378e-07x
4+2.0954e-04x
3-0.0351x
2+2.8187x+56.5296。
The present invention achieves satisfied effect through validation trial.Small-scale mixed-flow pump turbine described in embodiment is applicable to the low water head pumped storage power station of 10 ~ 15m, runner (9) running speed is 1000r/min ~ 1500r/min, and the actual energy conversion efficiency generating electricity under hydraulic turbine condition and draw water under pump operating condition that records all can reach more than 87%.
Above embodiment and embodiment are the concrete supports of the technological thought to a kind of small-scale mixed-flow pump turbine for low water head pumped storage power station that the present invention proposes; protection scope of the present invention can not be limited with this; every technological thought proposed according to the present invention; any equivalent variations that the technical program basis is done or the change of equivalence, all still belong to the scope of technical solution of the present invention protection.
Claims (8)
1. the small-scale mixed-flow pump turbine for low water head pumped storage power station, it comprises spiral case (1), draft tube (4), runner envelope (5), stator (6), upper cover (7), runner (9), seat ring (12) and bearing (ball) cover (13), wherein: spiral case (1), stator (6), runner (9) is connected successively with draft tube (4), runner (9) comprises runner bucket (2), lower ring (3), crown (8) and draft cone (19), upper cover (7) is arranged on runner (9), bearing (ball) cover (13) is arranged on upper cover (7), it is characterized in that the cornerite of runner bucket (2) is 105 ° ~ 124 °, runner bucket (2) water inlet limit (11) is 54 ° ~ 86 ° with the angle of outlet edge (10), runner bucket (2) is space three-dimensional distortion curved surface, in vertical bone line direction, thickness is equal, the molded line of runner bucket (2) is crescent shape, runner bucket (2) inlet height B1 ratio under runner bucket (2) thickness and hydraulic turbine condition is 0.06 ~ 0.11, runner bucket (2) inlet height B1 under hydraulic turbine condition is equal with stator (6) height B 2, the symmetrical whale shape of stator (6) aerofoil profile, crown (8) is provided with three uniform vents (18), spiral case (1) axial cross section is circular cross-section, draft tube (4) is bending elbow type, its flat segments axial cross section is circular cross-section, described stator (6) is distributed in seat ring (12) with single-row circular pattern, runner bucket (2) under stator (6) pitch circle diameter and hydraulic turbine condition limit (11) diameter ratio of intaking is 0.855 ~ 0.861, runner bucket (2) under stator (6) throat diameter and hydraulic turbine condition limit (11) diameter ratio of intaking is 0.124 ~ 0.131, stator (6) number is 21, and the curved dies of stator (6) is:
y＝-1.0185×10
-4x
3+0.0115x
2+0.3339x+124.6627。
2. small-scale mixed-flow pump turbine according to claim 1, it is characterized in that described runner bucket (2) is for space three-dimensional distortion curved surface, refer to and divide equally intercepting five cross sections on runner bucket (2) short transverse position, after ten curves in these five cross sections, equation is as follows:
Cross section 1:
A:y＝-8.1873×10
-7x
4+3.3151×10
-4x
3-0.0550x
2+4.3443x-7.0786；
B:y＝-7.0371×10
-7x
4-2.8457×10
-4x
3-0.0477x
2+3.8439x+9.0093；
Cross section 2:
C:y＝-8.3253×10
-7x
4+3.3913×10
-4x
3-0.0569x
2+4.5383x-10.2586；
D:y＝-7.1166×10
-7x
4+2.8906×10
-4x
3-0.0490x
2+3.9749x+8.3510；
Cross section 3:
E:y＝-7.9770×10
-7x
4+3.2027×10
-4x
3-0.0532x
2+4.1926x+5.0454；
F:y＝-5.8482×10
-7x
4+2.3309×10
-4x
3-0.0403x
2+3.3553x+28.7474；
Cross section 4:
G:y＝-6.2045×10
-7x
4+2.4262×10
-4x
3-0.0409x
2+3.3220x+31.7707；
H:y＝-5.6279×10
-7x
4+2.2104×10
-4x
3-0.0376x
2+3.0802x+42.6535；
Cross section 5:
I:y＝-6.3436×10
-7x
4+2.4662×10
-4x
3-0.0410x
2+3.2495x+40.6523；
J:y＝-5.4378×10
-7x
4+2.0954×10
-4x
3-0.0351x
2+2.8187x+56.5296。
3. small-scale mixed-flow pump turbine according to claim 1 and 2, is characterized in that runner bucket (2) number is 5 ~ 8.
4. small-scale mixed-flow pump turbine according to claim 1, it is characterized in that runner (9) height B 3 and the runner bucket (2) under hydraulic turbine condition limit (11) diameter ratio of intake is 0.366 ~ 0.407, runner bucket (2) outlet edge (10) the diameter D4 under hydraulic turbine condition is 0.538 ~ 0.578 with limit (11) diameter D0 ratio of intaking.
5. small-scale mixed-flow pump turbine according to claim 1, it is characterized in that spiral case (1) section area circumferentially direction variation tendency equation be: y=-121.8016+4446.2x, spiral case (1) cornerite is 318 ° ~ 337 °.
6. small-scale mixed-flow pump turbine according to claim 1, is characterized in that the right cone section angle of flare of draft tube (4) is 13 °.
7. small-scale mixed-flow pump turbine according to claim 1, is characterized in that runner bucket (2) outlet edge (10) the diameter D7 under hydraulic turbine condition is 1.661 ~ 1.812 with the ratio of water inlet limit (11) diameter D4.
8. small-scale mixed-flow pump turbine according to claim 1, is characterized in that the aperture that crown (8) is provided with three uniform vents (18) is 10mm.
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