CN201133321Y - Small runner crown exit port mixed flow turbine runner - Google Patents
Small runner crown exit port mixed flow turbine runner Download PDFInfo
- Publication number
- CN201133321Y CN201133321Y CNU2007200827310U CN200720082731U CN201133321Y CN 201133321 Y CN201133321 Y CN 201133321Y CN U2007200827310 U CNU2007200827310 U CN U2007200827310U CN 200720082731 U CN200720082731 U CN 200720082731U CN 201133321 Y CN201133321 Y CN 201133321Y
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- limit
- crown
- edge
- intersection point
- runner
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The utility model provides a small upper canopy outlet mixed-flow hydroturbine rotating wheel which comprises an upper canopy, a lower ring and a plurality of vanes arranged between the upper canopy and the lower ring. The lower end of the upper canopy is lower than the upper edge of the lower ring and is provided with an upper canopy water outlet. The intersection point of the upper canopy edge and a water outlet edge is lower than the intersection point of a water inlet edge and the lower ring edge, and the ratio of the vertical axial distance between the intersection point of the upper canopy edge and the water outlet edge and the intersection point of the water inlet edge and the lower ring edge, and the vertical axial distance between the intersection point of the water outlet edge and the lower ring edge and the intersection point of the water inlet edge and the lower ring edge is between 0.25 and 0.3. The ratio of the distance from the intersection point of the upper canopy edge and the water outlet edge to the spiral axial line of the rotating wheel and the minimum semidiameter of the lower ring edge is not more than 0.15 to 0.2. The utility model can effectively reduces the pressure pulse caused by tail water pipe vortex, improves the hydraulic stability of the operation of the hydroturbine and increases the working efficiency of the hydroturbine, and the whole structure is more stable.
Description
Technical field
The utility model relates to the rotary wheel of water turbine that a kind of hydroelectric power is adopted, and relates generally to a kind of francis turbine runner that has improved runner bucket position and shape.
Background technique
In the prior art, what francis turbine runner mainly adopted is that stator blade adds the draft cone structure, and the optimized operation district is very narrow.When Francis turbine moved in the optimized operation district, the outlet current of blade were approximately normal direction outflow runner near the crown, and the circular rector of blade exit current is approximately zero near the crown, no whirlpool band in the draft tube.But work as operating conditions and depart from the optimized operation district, the outlet of rotary wheel circular rector increases, and the circular rector of current is defined as the long-pending Γ of the being=2 π V of peripheral velocity and radius
u* r, rotary water current form extremely unsettled whirlpool band after entering the draft tube with decelerating effect, and it will produce periodic pressure pulsation.Particularly when Francis turbine operates in the sub load district, it is identical with the runner sense of rotation but speed only is the unstable spirality eccentric vortex band of 1/4～1/3 runner rotational frequency to form sense of rotation behind the draft tube, and the Pressure Fluctuation in Draft Tube of its generation is much bigger.This periodic pressure pulsation can make the mechanical vibration of water turbine increase usually, loses efficacy or the destruction Component of Hydraulic Turbines, will cause hydraulic generator unit power hunting when serious, and is very big to the stable operation harm of water turbine.Particularly, especially influence the proper functioning of hydraulic generator unit for the big water power plant that also needs frequently to regulate load of those head luffings.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned technological deficiency, provides a kind of adaptability wider little crown outlet francis turbine runner.The utility model can effectively reduce the pressure pulsation that draft tube whirlpool band produces, and has improved the hydraulic stability of hydraulic turbine operation greatly, increased the working efficiency of water turbine, and overall structure is more firm.
For achieving the above object, the technical solution adopted in the utility model is:
Little crown francis turbine runner, comprise the crown that is positioned at runner upper support blade, the following ring and a plurality of blade that is arranged between crown and the following ring that connect blade, blade comprises that the limit of blade and crown handing-over is the crown limit, blade is to encircle the limit down with the limit of following ring handing-over, the limit of blade water inlet portion is the water inlet limit, the limit of blade water part is for going out the waterside, the home position and the shape of blade have been determined by this four edges, it is characterized in that: the lower end of described crown is lower than ring upper edge down, there is a crown water outlet described crown lower end, described crown limit is lower than into water limit and the intersection point on ring limit down with the intersection point that goes out the waterside, and crown limit and go out the waterside intersection point, the water inlet limit and down ring limit intersection point the vertical axial distance with go out waterside and ring limit intersection point down, the ratio of the vertical axial distance of water inlet limit and following ring limit intersection point is 0.25-0.3, described crown limit and the spin axis of the intersection point that goes out the waterside near runner, and the crown limit is 0.15-0.2 to the distance of runner spin axis with the ratio that encircles the least radius on limit down with going out the waterside intersection point.
The axial plane length on described crown limit is much larger than the axial plane length of encircling the limit down, and the axial plane length on crown limit is 1.75-2 with the ratio that encircles the axial plane length on limit down.
The cross section aerofoil profile space length on described crown limit is greater than the cross section aerofoil profile space length that encircles the limit down, and the cross section aerofoil profile space length on crown limit is 1.15-1.2 with the ratio that encircles the cross section aerofoil profile space length on limit down.
The little crown outlet of the utility model francis turbine runner, the more close runner spin axis of crown water outlet, crown district exit radius of blade reduces, when at hydraulic turbine discharge during less than the operation at part load of optimized operation district flow, near the peripheral velocity V of blade crown outlet area current
uReduce, exit radius of blade reduces and current peripheral velocity V
uReduce to greatly reduce circular rector Γ=2 π V near blade crown outlet area current
u* r reduces the mobile revolving ability that enters draft tube, and it is more stable to flow, and Pressure Fluctuation in Draft Tube reduces; Because the downstream of the more close water turbine of crown water outlet, make that crown district vane type line is obviously elongated, current flow through long crown district blade passage makes current obtain uniform and stable acceleration, velocity distribution and pressure distribution along the blade current are more even, and the axial velocity of blade exit district current increases, thereby make the current that flow out runner more stable, this has also reduced Pressure Fluctuation in Draft Tube; Little crown outlet francis turbine runner and since during operation at part load the rotating eccentricity of the diameter of draft tube spirality whirlpool band and whirlpool band apart from all less than traditional francis turbine runner, thereby Pressure Fluctuation in Draft Tube reduces greatly when making operation at part load.
Use the little crown outlet of the utility model francis turbine runner, when hydraulic turbine operation at hydraulic turbine discharge during greater than the big load of optimized operation district flow, the blade of little crown outlet francis turbine runner is because the spin axis of the more close runner of intersection point of runner crown and blade exit, crown district exit radius of blade reduces, compare with traditional francis turbine runner, at this moment, near the reverse peripheral velocity V of crown blade exit district current
uDo not increase, because reducing of exit radius of blade makes the circular rector Γ=2 π V by crown blade exit district current
uThe absolute value of * r reduces, and enters the mobile more stable of draft tube thereby make, and straight shape whirlpool band diameter reduces, and Pressure Fluctuation in Draft Tube reduces; In addition, because hydraulic turbine operation is at hydraulic turbine discharge during greater than the big load of optimized operation district flow, has bigger axial velocity by crown district blade exit current, therefore the little crown according to the utility model design exports francis turbine runner, the reducing to make of during large load operation because straight shape whirlpool band diameter flowed more stablely in the draft tube, and Pressure Fluctuation in Draft Tube is littler.
Because the size of outlet of rotary wheel circular rector has determined the size of draft tube whirlpool band, the height of intensity and the pressure pulsation that produced, therefore, the little crown outlet of the utility model francis turbine runner is by changing near the geometrical shape of the blade exit of runner crown, position and size, and match with other geometrical shape of blade, reduced near the circular rector of the outlet of rotary wheel current in crown district significantly, thereby solved unit and moved this technical barrier of harm that how to reduce Pressure Fluctuation in Draft Tube significantly in non-optimized operation district, improved the hydraulic stability of hydraulic turbine operation greatly.
Advantage of the present utility model is:
1, traditional relatively francis turbine runner, the utility model has been cancelled the draft cone that traditional Francis turbine must be provided with, and has enlarged the position range that blade is set, and has simplified the upper crown separation structure; The crown limit of the utility model by runner bucket, go out waterside, water inlet limit and down the relation of each intersection point of ring limit determine the home position and the dimensional range of runner bucket, compare traditional francis turbine runner, the molded lines of the utility model runner crown district blade is obviously elongated, current flow through long blade passage is quickened current uniformly and stably, and the speed and the pressure distribution of current are more even; In addition, the traditional relatively Francis turbine of water outlet of the present utility model is littler, the outlet current are more near the spin axis of runner like this, the axial velocity of blade exit part current increases, thereby make the current that flow out runner more stable, the whirlpool band that forms in the draft tube is also more stable, reaches the effect that reduces runner water export circular rector, has reduced Pressure Fluctuation in Draft Tube.
2, use little crown outlet francis turbine runner of the present utility model, no matter operate in hydraulic turbine discharge less than the sub load district of optimized operation district flow or operate in the big loading zone of hydraulic turbine discharge greater than optimized operation district flow, Pressure Fluctuation in Draft Tube all has obvious reduction, especially in the sub load district of hydraulic turbine discharge less than optimized operation district flow, the Pressure Fluctuation in Draft Tube that is produced by spirality whirlpool band reduces significantly, therefore greatly reduces the harm of Pressure Fluctuation in Draft Tube to water turbine.
3, the utility model has improved the hydraulic stability of Francis turbine operation greatly, especially to those water power plants that head luffing is big, Load Regulation is frequent, has stronger adaptability.
4, the utility model is simpler on structural configuration, does not need to have reduced the maintenance cost at runner crown outlet installing draft cone.
5, the utility model has improved the strength and stiffness of blade, and the runner overall structure is more firm.
Description of drawings:
Fig. 1 is the utility model cross-sectional view.
Fig. 2 is a blade structure schematic representation among Fig. 1.
Fig. 3 is traditional Francis turbine generalized section.
Fig. 4 is the utility model structural representation.
Mark among the figure: 1 is blade, and 2 is crown, and 3 for encircling down, 4 is draft cone, and 5 is the crown water outlet, and 6 are the water inlet limit, 7 for going out the waterside, and 8 is the crown limit, and 9 for encircling the limit down, 10 for encircling the upper edge down, 11 are following ring lower edge, and 12 be spin axis, 13 for the crown limit with go out the waterside intersection point, 14 are water inlet limit and following ring limit intersection point, and 15 for going out the waterside and encircling the limit intersection point down.
Embodiment
Little crown outlet francis turbine runner, comprise the runner crown 2 that is positioned at runner upper support blade 1, the runner that connects blade 1 is ring 3 and be arranged at runner crown 2 and runner a plurality of blades 1 between the ring 3 down down, runner bucket comprises that the blade 1 and the limit of crown 2 handing-over are blade crown limit 8, blade 1 is ring limit 9 under the blade with the limit of ring 3 handing-over down, the limit of blade 1 water inlet portion is that the limit of blade water inlet limit 6 and blade 1 water part is a blade outlet 7, the home position and the shape of blade 1 have been determined by this four edges, should use in the example, runner crown 2 lower ends are lower than ring upper edge 10 down, compare traditional Francis turbine and have enlarged the position range that blade 1 is set; There is a crown discharge opening 5 runner crown 2 lower ends, owing to cancelled the draft cone 4 that traditional Francis turbine must be provided with, therefore simple in structure, more convenient maintenance; Should use in the example, crown limit 8 is lower than into water limit 6 and the intersection point 14 on ring limit 9 down with the intersection point 13 that goes out waterside 7, and crown limit 8 and go out waterside 7 intersection points 13, water inlet limit 6 and down ring limit 9 intersection points 14 the vertical axial distance with go out waterside 7 and down ring limit 9 intersection points 15, water inlet limit 6 and down the vertical axial distance ratio of ring limit 9 intersection points 14 be 0.27, compare traditional francis turbine runner blade, the crown molded lines is obviously elongated, thereby has reduced to flow out the current circular rector of runner; Should be with example crown limit 8 and the intersection point 13 that goes out waterside 7 very near the spin axis of runner, and crown limit 8 is 0.18 to the distance of runner spin axis 12 with the ratio that encircles the least radius on limit 9 down with going out waterside 7 intersection points 13, crown water outlet 5 more traditional francis turbine runners are littler like this, more near the spin axis 12 of runner, the axial velocity of blade 1 exit portion current increases, thereby make the current that flow out runner more stable, whirlpool band in the draft tube is also more stable, has reduced the pressure pulsation of draft tube.Should be with the axial plane length on example crown limit 8 much larger than the axial plane length of encircling limit 9 down, the axial plane length on crown limit 8 is 1.8 with the ratio of the axial plane length on ring limit 9 down, further defines the geometrical shape of blade 1.Should be with the cross section aerofoil profile space length on example crown limit 8 greater than the cross section aerofoil profile space length that encircles limit 9 down, the cross section aerofoil profile space length on crown limit 8 is 1.16 with the ratio that encircles the cross section aerofoil profile space length on limit 9 down, further define the geometrical shape of blade 1, make blade 1 upper crown joint line obviously elongated, current flow through long blade passage is quickened current uniformly and stably, more even along the speed and the pressure distribution of blade 1 current.
From should with example Pressure Fluctuation in Draft Tube measured result and traditional Francis turbine measured result more as can be seen, no matter operate in hydraulic turbine discharge less than the sub load district of optimized operation district flow or operate in the big loading zone of hydraulic turbine discharge greater than optimized operation district flow, use the novel little crown outlet francis turbine runner of this use, Pressure Fluctuation in Draft Tube all has obvious reduction, especially in the sub load district of hydraulic turbine discharge less than optimized operation district flow, the Pressure Fluctuation in Draft Tube that is produced by spirality whirlpool band reduces significantly, and this has improved the hydraulic stability of hydraulic turbine operation greatly.
The Pressure Fluctuation in Draft Tube measured result relatively
The utility model is not limited to above-mentioned mode of execution.
Claims (3)
1, little crown outlet francis turbine runner, comprise crown (2), following ring (3) and be arranged at crown (2) and the following a plurality of blades (1) that encircle between (3), blade (1) comprises crown limit (8), encircles limit (9), water inlet limit (6) and go out waterside (7) down, it is characterized in that: described crown (2) lower end is lower than encircles upper edge (10) down; There is a crown water outlet (5) described crown (2) lower end; Described crown limit (8) and the intersection point (13) that goes out waterside (7) are lower than into water limit (6) and the intersection point (14) on ring limit (9) down, and crown limit (8) and go out waterside (7) intersection point (13), water inlet limit (6) and down ring limit (9) intersection point (14) the vertical axial distance with go out waterside (7) and ring limit (9) intersection point (15), intake limit (6) and the following ratio that encircles the vertical axial distance of limit (9) intersection point (14) they are 0.25-0.3 down; Described crown limit (8) and the intersection point (13) that goes out waterside (7) are 0.15-0.2 to the distance of runner spin axis (12) with the ratio of the least radius on ring limit (9) down.
2, little crown outlet francis turbine runner according to claim 1, it is characterized in that: the axial plane length on described crown limit (8) is 1.75-2 with the ratio that encircles the axial plane length on limit (9) down.
3, little crown outlet francis turbine runner according to claim 2, it is characterized in that: the cross section aerofoil profile space length on described crown limit (8) is not less than 1.15-1.2 with the ratio that encircles the cross section aerofoil profile space length on limit (9) down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200827310U CN201133321Y (en) | 2007-12-27 | 2007-12-27 | Small runner crown exit port mixed flow turbine runner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200827310U CN201133321Y (en) | 2007-12-27 | 2007-12-27 | Small runner crown exit port mixed flow turbine runner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201133321Y true CN201133321Y (en) | 2008-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200827310U Expired - Lifetime CN201133321Y (en) | 2007-12-27 | 2007-12-27 | Small runner crown exit port mixed flow turbine runner |
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| Country | Link |
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| CN (1) | CN201133321Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010135989A1 (en) * | 2009-05-27 | 2010-12-02 | 南京星飞冷却设备有限公司 | Rotating wheel used for direct-connection low-speed small-scale mixed-flow hydroturbine of hydrodynamic energy-saving cooling tower |
| CN102410127A (en) * | 2011-10-27 | 2012-04-11 | 浙江大学 | Runner cone device |
| CN102536591A (en) * | 2012-02-07 | 2012-07-04 | 戴会超 | Mixed-flow type water turbine for increasing survival rate of fishes |
| CN103114954A (en) * | 2012-12-07 | 2013-05-22 | 哈尔滨电机厂有限责任公司 | Method for improving pressure pulsation of mixed-flow type pump turbine |
| CN106523242A (en) * | 2016-12-07 | 2017-03-22 | 中国水利水电科学研究院 | Method for relieving harms of high partial load pressure pulsation of mixed-flow water turbine |
| CN110410259A (en) * | 2019-08-07 | 2019-11-05 | 东方电气集团东方电机有限公司 | A kind of leaf head cantilever type runner |
| CN111175018A (en) * | 2020-01-09 | 2020-05-19 | 哈尔滨电机厂有限责任公司 | Method for judging insufficient rigidity of downstream side of elbow of high specific speed hydraulic mechanical model |
-
2007
- 2007-12-27 CN CNU2007200827310U patent/CN201133321Y/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2492351C1 (en) * | 2009-05-27 | 2013-09-10 | Нанцзин Синфэй Кулинг Эквипмент Ко., Лтд. | Impeller for directly connected low-speed small hydraulic turbine of diagonal type used in hydrodynamic power-saving cooling tower |
| EP2436916A1 (en) * | 2009-05-27 | 2012-04-04 | Nanjing Xingfei Cooling Equipment Co.,ltd. | Rotating wheel used for direct-connection low-speed small-scale mixed-flow hydroturbine of hydrodynamic energy-saving cooling tower |
| WO2010135989A1 (en) * | 2009-05-27 | 2010-12-02 | 南京星飞冷却设备有限公司 | Rotating wheel used for direct-connection low-speed small-scale mixed-flow hydroturbine of hydrodynamic energy-saving cooling tower |
| EP2436916A4 (en) * | 2009-05-27 | 2013-05-01 | Nanjing xingfei cooling equipment co ltd | Rotating wheel used for direct-connection low-speed small-scale mixed-flow hydroturbine of hydrodynamic energy-saving cooling tower |
| CN102410127A (en) * | 2011-10-27 | 2012-04-11 | 浙江大学 | Runner cone device |
| CN102536591A (en) * | 2012-02-07 | 2012-07-04 | 戴会超 | Mixed-flow type water turbine for increasing survival rate of fishes |
| CN102536591B (en) * | 2012-02-07 | 2014-04-16 | 戴会超 | Mixed-flow type water turbine for increasing survival rate of fishes |
| CN103114954A (en) * | 2012-12-07 | 2013-05-22 | 哈尔滨电机厂有限责任公司 | Method for improving pressure pulsation of mixed-flow type pump turbine |
| CN103114954B (en) * | 2012-12-07 | 2016-01-20 | 哈尔滨电机厂有限责任公司 | Improve the method for pressure pulsation of mixed-flow type pump turbine |
| CN106523242A (en) * | 2016-12-07 | 2017-03-22 | 中国水利水电科学研究院 | Method for relieving harms of high partial load pressure pulsation of mixed-flow water turbine |
| CN110410259A (en) * | 2019-08-07 | 2019-11-05 | 东方电气集团东方电机有限公司 | A kind of leaf head cantilever type runner |
| CN111175018A (en) * | 2020-01-09 | 2020-05-19 | 哈尔滨电机厂有限责任公司 | Method for judging insufficient rigidity of downstream side of elbow of high specific speed hydraulic mechanical model |
| CN111175018B (en) * | 2020-01-09 | 2021-08-20 | 哈尔滨电机厂有限责任公司 | Method for judging insufficient rigidity of downstream side of elbow of high specific speed hydraulic mechanical model |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: DONGFANG ELECTRIC GROUP DONGFANG ELECTRIC MACHINE Free format text: FORMER OWNER: DONGFANG ELECTRICAL MACHINE CO., LTD. Effective date: 20100115 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20100115 Address after: No 188, the Yellow River West Road, Deyang, Sichuan Province, 618000 Patentee after: Dongfang Electric Group Dongfang Motor Co., Ltd. Address before: No 188, the Yellow River West Road, Deyang, Sichuan Province, 618000 Patentee before: Dongfang Electric Machine Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20081015 |