CN204691971U - A kind of fixed-blade propeller turbine of anti-cavitation of clearance - Google Patents
A kind of fixed-blade propeller turbine of anti-cavitation of clearance Download PDFInfo
- Publication number
- CN204691971U CN204691971U CN201520235227.4U CN201520235227U CN204691971U CN 204691971 U CN204691971 U CN 204691971U CN 201520235227 U CN201520235227 U CN 201520235227U CN 204691971 U CN204691971 U CN 204691971U
- Authority
- CN
- China
- Prior art keywords
- fixed
- guide vane
- runner
- cavitation
- blade
- 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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Classifications
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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
The utility model discloses a kind of fixed-blade propeller turbine of anti-cavitation of clearance, comprise from outside to inside with one heart and do not contact the fixed guide vane of setting, movable guide vane and runner, fixed guide vane annular spread is arranged on the inner side of spiral case, spiral case is connected with draft tube in the middle part of bottom surface, and runner is fixed on main shaft, also comprises outer shroud, outer shroud directly welds with the blade of runner, and outer shroud adopts the mode of labyrinth seal to be arranged in runner envelope.The fixed-blade propeller turbine of a kind of anti-cavitation of clearance of the utility model, outer shroud be arranged on the leakage flow avoiding wheel rim place to a certain extent, reduce leakage loss, improve the cavitation ability at blade rim place.The integrated performance index such as hydraulic efficiency, cavitation and stability of fixed-blade propeller turbine under large discharge operating mode is run with outer ring structure is all significantly improved.
Description
Technical field
The utility model belongs to Fluid Machinery and Engineering equipment technical field, relates to a kind of fixed-blade propeller turbine of anti-cavitation of clearance.
Background technique
Shortage along with worldwide water resources is on the rise and the requirement of environmental protection, the significance of low head hydropower station construction increases day by day, the features such as axial flow Hydraulic Power Unit is high with its specific speed, specific discharge is large, are widely applied in the waterpower resourses of low water head, large discharge.
Current, the energy characteristics of axial flow hydraulic turbine has reached very high level, unit efficiency achieves very large breakthrough, requirement for unit is made into " stability and high efficiency " by the formulation of " efficient stable " in past, and therefore stability problem has become the overriding concern factor of unit design.Practice shows, the flowing of axial flow hydraulic turbine internal clearance has great impact to hydraulic performance, particularly fixed-blade propeller turbine impact more very, most typical is rim clearance, although, the physical dimension of rim clearance is compared very little with whole runner, but has a huge impact the internal flow of runner.First, easily there is leakage flow in rim clearance, and the energy carried out with runner is reduced, and causes unit efficiency and exert oneself to decline rapidly, causes the irregular operation of unit; Secondly, Clearance Flow easily causes clearance cavitation, causes the vibration & noise of unit exception; Finally, in gap, flowing is turbulent flow, easily produces leakage-vortex, thus causes self-excited vibration, cause the irregular operation of unit at runner outer rim place.
Model utility content
The purpose of this utility model is the fixed-blade propeller turbine providing a kind of anti-cavitation of clearance, solves existing water runner unit affects set steady problem because of Clearance Flow.
The technological scheme that the utility model adopts is: a kind of fixed-blade propeller turbine of anti-cavitation of clearance, comprise from outside to inside with one heart and do not contact the fixed guide vane of setting, movable guide vane and runner, fixed guide vane annular spread is arranged on the inner side of spiral case, spiral case is connected with draft tube in the middle part of bottom surface, and runner is fixed on main shaft, also comprises outer shroud, outer shroud directly welds with the blade of runner, and outer shroud adopts the mode of labyrinth seal to be arranged in runner envelope.
Feature of the present utility model is also:
Fixed guide vane and movable guide vane are annular cascade, and movable guide vane can rotate around own axes.
Fixed guide vane lobe numbers is 24, and the blade number of movable guide vane is 32.
The blade of runner is for determine paddle.
The beneficial effects of the utility model are: the fixed-blade propeller turbine of a kind of anti-cavitation of clearance of the utility model, outer shroud be arranged on the leakage flow avoiding wheel rim place to a certain extent, reduce leakage loss, improve the cavitation ability at blade rim place.The integrated performance index such as hydraulic efficiency, cavitation and stability of fixed-blade propeller turbine under large discharge operating mode is run with outer ring structure is all significantly improved.
Accompanying drawing explanation
Fig. 1 is the structural representation of the fixed-blade propeller turbine of a kind of anti-cavitation of clearance of the utility model;
Fig. 2 is the sectional drawing of the fixed-blade propeller turbine of a kind of anti-cavitation of clearance of the utility model.
In figure, 1. spiral case, 2. fixed guide vane, 3. movable guide vane, 4. runner, 5 outer shrouds, 6. draft tube, 7. runner envelope, 8. concrete, 9. main shaft.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
The structure of the fixed-blade propeller turbine of a kind of anti-cavitation of clearance of the utility model, as shown in Figures 1 and 2, comprise from outside to inside with one heart and do not contact the fixed guide vane 2 of setting, movable guide vane 3 and runner 4, described fixed guide vane 2 annular spread is arranged on the inner side of spiral case 1, spiral case 1 is connected with draft tube 6 in the middle part of bottom surface, runner 4 is fixed on main shaft 9, also comprise outer shroud 5, outer shroud 5 directly welds with the blade of runner 4, outer shroud 5 adopts the mode of labyrinth seal to be arranged in runner envelope 7, fixed guide vane 2 and movable guide vane 3 are annular cascade, and movable guide vane 3 can rotate around own axes, fixed guide vane 2 lobe numbers is 24, the blade number of movable guide vane 3 is 32, runner 4 blade is for determine paddle.
During use, current flow into movable guide vane 3 through spiral case 1 and fixed guide vane 2, and through the guide functions of stator, water (flow) direction changes axis into by radial direction and flows into runner, and current flow into downstream through draft tube 6 after driving runner 4 to rotate acting.Outer shroud 5 and runner 4 are welded as a whole, and belong to rotary component, and runner envelope 7 belongs to fixed component, adopts labyrinth seal between the two.In runner envelope 7, because runner 4 blade outer rim has welded one piece of outer shroud 5, the gap between original blade outer rim and runner envelope disappears, and adds the effective discharge of acting so on the one hand, avoids leaf margin Clearance Flow on the other hand.
The fixed-blade propeller turbine of a kind of anti-cavitation of clearance of the utility model, outer shroud be arranged on the leakage flow avoiding wheel rim place to a certain extent, reduce leakage loss, improve the cavitation ability at blade rim place.The integrated performance index such as hydraulic efficiency, cavitation and stability of fixed-blade propeller turbine under large discharge operating mode is run with outer ring structure is all significantly improved.
Claims (4)
1. the fixed-blade propeller turbine of an anti-cavitation of clearance, it is characterized in that, comprise from outside to inside with one heart and do not contact the fixed guide vane (2) of setting, movable guide vane (3) and runner (4), described fixed guide vane (2) annular spread is arranged on the inner side of spiral case (1), draft tube (6) is connected with in the middle part of spiral case (1) bottom surface, described runner (4) is fixed on main shaft (9), also comprise outer shroud (5), outer shroud (5) directly welds with the blade of runner (4), described outer shroud (5) adopts the mode of labyrinth seal to be arranged in runner envelope (7).
2. the fixed-blade propeller turbine of a kind of anti-cavitation of clearance according to claim 1, it is characterized in that, described fixed guide vane (2) and movable guide vane (3) are annular cascade, and movable guide vane (3) can rotate around own axes.
3. the fixed-blade propeller turbine of a kind of anti-cavitation of clearance according to claim 1, is characterized in that, described fixed guide vane (2) lobe numbers is 24, and the blade number of movable guide vane (3) is 32.
4. the fixed-blade propeller turbine of a kind of anti-cavitation of clearance according to claim 1, is characterized in that, the blade of described runner (4) is for determine paddle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520235227.4U CN204691971U (en) | 2015-04-17 | 2015-04-17 | A kind of fixed-blade propeller turbine of anti-cavitation of clearance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520235227.4U CN204691971U (en) | 2015-04-17 | 2015-04-17 | A kind of fixed-blade propeller turbine of anti-cavitation of clearance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204691971U true CN204691971U (en) | 2015-10-07 |
Family
ID=54232272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520235227.4U Expired - Fee Related CN204691971U (en) | 2015-04-17 | 2015-04-17 | A kind of fixed-blade propeller turbine of anti-cavitation of clearance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204691971U (en) |
-
2015
- 2015-04-17 CN CN201520235227.4U patent/CN204691971U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151007 Termination date: 20180417 |