CN1022702C - Water turbine rotor - Google Patents
Water turbine rotor Download PDFInfo
- Publication number
- CN1022702C CN1022702C CN89105860A CN89105860A CN1022702C CN 1022702 C CN1022702 C CN 1022702C CN 89105860 A CN89105860 A CN 89105860A CN 89105860 A CN89105860 A CN 89105860A CN 1022702 C CN1022702 C CN 1022702C
- Authority
- CN
- China
- Prior art keywords
- ring
- water turbine
- blade
- crown
- specific speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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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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- Hydraulic Turbines (AREA)
Abstract
Increasing a water head applied to a water turbine with a definite specific speed is the developing direction of the current water turbine; the potential to improve the cavitation property of a water turbine according to the traditional structure is not big, and thus, the development of the water turbine is limited. The present invention adopts two structures, one structure is that an additional blade is arranged between every two blades in a lower ring of a francis wheel with a medium specific speed and a high specific speed, or the other structure is that the lower ring is removed, an intermedium ring is added, and blades are additionally arranged on the outer rim of the intermedium ring; both the two structures can reduce the cavitation factor of the water turbine largely; the latter structure can also increase the rotational speed and the structural strength, and a water turbine with a certain specific speed can be applied to a higher water head.
Description
The present invention relates to a kind of francis turbine runner of low pitting coefficient.
The middle and high specific speed mixed-flow type turbine runner of modern extensive use as shown in Figure 1, at its crown and down between the ring, fixing along the equally distributed some blades of circumference, this blade abbreviates two fulcrum blades as, near the degree of vacuum of encircling the vacuum side of blade in zone down is the highest in the whole runner, as shown in Figure 2.The degree of vacuum of vacuum side of blade under encircle to crown and reduce gradually.Therefore the ratio of near the degree of vacuum of the vacuum side of blade of ring and working head H is maximum down.This ratio is the pitting coefficient σ of water turbine
aIt is limiting the maximum draught-height H of water turbine
s, also just limiting the highest use head of water turbine.
Disclose a kind of francis turbine runner for Japanese patent gazette JP61-25972A number, be fixed with the cantilever blade of equal in length at the outer surface of central ring with central ring.Its shortcoming is that the blade excretion coefficient increases, thereby causes the specific discharge of runner to reduce or the hydraulic loss increase.
The purpose of this invention is to provide a kind of francis turbine runner that can overcome the low pitting coefficient of above-mentioned prior art shortcoming, use head to improve it; Perhaps under identical pitting coefficient condition, increase the specific discharge of runner, to increase exerting oneself of water turbine.
Francis turbine runner of the present invention, comprise a crown and a following ring, and be fixed on crown and the following multi-disc blade between the ring, be fixed on crown and increased length and all less blade of width between the blade between the ring down at per two, one end of this blade is fixed on down ring inner surface, and its other end is a cantilever.
Another kind of francis turbine runner of the present invention, comprise a crown and a central ring, the multi-disc vanes fixed is arranged between crown and central ring, also fixing the multi-disc blade at the central ring outer surface cantilever, it is linear leaf that half is arranged in these blades, half is a short blade in addition, and their width equates, and is the alternate layout of length.
The present invention is further illustrated below in conjunction with accompanying drawing.Wherein:
Fig. 1 is conventional francis turbine runner structural representation;
Fig. 2 changes schematic representation for encircling the crown pitting coefficient under the vacuum side of blade edge;
Fig. 3 is a francis turbine runner structural representation of the present invention;
Fig. 4 is the sectional view of N-N section among Fig. 3;
Fig. 5 is an another kind of francis turbine runner structural representation of the present invention;
Fig. 6 is the view of M direction among Fig. 5;
Francis turbine runner of the present invention comprises following two kinds of technological schemes:
The structure of first kind of scheme as shown in Figure 3.Near the zone of encircling (2) down, between per two two fulcrum blades (3), increase the additional blades (4) that width b is little at runner.The outer end of this additional blades is fixed on down ring inner surface, becomes the cantilever blade that following ring is a fulcrum.
If the length 1 of this additional blades approximates 2/3rds of two fulcrum length of blade L greatly, press the leaf grating principle, the degree of vacuum Δ H of blade will reduce half, just pitting coefficient σ
nValue will reduce by 50%.Obviously the pitting coefficient of the water turbine of equipping with such runner is the σ among Fig. 2
m, and no longer be σ
aσ as can be seen from Figure 2
mMuch smaller than σ
a
The structure of second kind of scheme as shown in Figure 5.Cancel traditional following ring, increased central ring (7).Be connected multi-disc blade (3) between central ring and the crown, the outer surface of central ring is being fixed linear leaf of cantilever (5) and short blade (4), and is that alternate layout, width equate.Have only between the outer rim of cantilever blade and the static runner envelope (6) very little, the gap delta that does not hinder runner rotation, the same effect of playing the reduction pitting coefficient of structure of this structure and first kind of scheme.Because central ring has replaced time ring, the wheel disc friction loss reduces greatly, therefore can improve the specific speed of water turbine and the efficient of unlikely reduction water turbine.Also because reducing apart from B between central ring and the crown, thereby the strength and stiffness of runner have all improved.Cancel the experience that outer shroud can improve unit speed according to axial flow hydraulic turbine, such structure also can improve unit speed.All these will make the present invention can be applied to higher head.If be used for the generating of large hydropower station first stage of construction extra low head, just can increase the machine flow, increase substantially unit output.
Half is arranged than long in the cantilever blade that central ring outer surface of the present invention is being fixed, half is than short in addition, and this is and the disclosed main difference with francis turbine runner of central ring of JP61-25972A.Under and the condition that blade outlet thickness is identical identical at blade amt, the excretion coefficient of the formed excretion coefficient of blade with the alternate layout of length when all being linear leaf wants little one times, thereby can obtain less water outlet axial plane flow velocity and water outlet relative velocity, promptly under identical flow conditions, can pass through bigger flow.Also since square being directly proportional of the hydraulic loss of water part and relative velocity be directly proportional with area of contact, therefore under the same traffic condition hydraulic loss of the present invention less than the hydraulic loss that has identical specific speed rotary wheel of water turbine now.
The present invention can improve the use head of certain specific speed water turbine.It is applicable to the Francis turbine of middle and high specific speed, is specially adapted to contain in the working water condition and the generating of large hydropower station first stage of construction extra low head of a large amount of silts.
Realize that the traditional francis turbine runner of method of the present invention and research, design, manufacturing is the same substantially, there is no particular difficulty.
Claims (2)
1, a kind of francis turbine runner, comprise a crown and a following ring, and be fixed on crown and the following multi-disc blade between the ring, it is characterized in that per two are fixed on crown and have increased length and all less blade of width between blade between the ring down, one end of this blade is fixed on down ring inner surface, and its other end is a cantilever.
2, a kind of francis turbine runner, comprise a crown and a central ring, the multi-disc vanes fixed is arranged between crown and central ring, it is characterized in that the central ring outer surface also fixing the multi-disc blade cantilever, it is linear leaf that half is arranged in these blades, half is a short blade in addition, and their width equates, and is the alternate layout of length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN89105860A CN1022702C (en) | 1989-02-14 | 1989-02-14 | Water turbine rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN89105860A CN1022702C (en) | 1989-02-14 | 1989-02-14 | Water turbine rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1035163A CN1035163A (en) | 1989-08-30 |
| CN1022702C true CN1022702C (en) | 1993-11-10 |
Family
ID=4856495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN89105860A Expired - Fee Related CN1022702C (en) | 1989-02-14 | 1989-02-14 | Water turbine rotor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1022702C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2185525C2 (en) * | 1996-10-17 | 2002-07-20 | Мирослав СЕДЛАЧЕК | Hydraulic machine |
| DE10325698B4 (en) * | 2003-06-06 | 2005-12-29 | Voith Siemens Hydro Power Generation Gmbh & Co. Kg | Impeller for a Francis turbine |
| CN100427753C (en) * | 2005-11-18 | 2008-10-22 | 清华大学 | Mixed flow type water turbin having H-type flow path rotary wheel |
| CN102364083B (en) * | 2011-07-01 | 2013-04-24 | 哈尔滨电机厂有限责任公司 | Long-short blade rotating wheel for mixed flow pump turbine |
| CN104791172B (en) * | 2015-03-12 | 2017-10-10 | 哈尔滨电机厂有限责任公司 | The mixed flow pump turbine blade space method for determining position of bidirectional shunt |
| CN104847568B (en) * | 2015-03-19 | 2017-10-20 | 中国水利水电科学研究院 | One kind outlet dual channel francis turbine runner |
-
1989
- 1989-02-14 CN CN89105860A patent/CN1022702C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1035163A (en) | 1989-08-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |