CN108691717B - Mixed-flow water turbine with double rotating wheels - Google Patents
Mixed-flow water turbine with double rotating wheels Download PDFInfo
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- CN108691717B CN108691717B CN201710231291.9A CN201710231291A CN108691717B CN 108691717 B CN108691717 B CN 108691717B CN 201710231291 A CN201710231291 A CN 201710231291A CN 108691717 B CN108691717 B CN 108691717B
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- Prior art keywords
- main shaft
- water
- blades
- runner
- drainage cone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/12—Blades; Blade-carrying rotors
- F03B3/121—Blades, their form or construction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/16—Stators
- F03B3/18—Stator blades; Guide conduits or vanes, e.g. adjustable
- F03B3/183—Adjustable vanes, e.g. wicket gates
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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
Abstract
The mixed-flow water turbine with the double rotating wheels is characterized in that a main shaft is arranged in the middle of guide vanes uniformly distributed on the circumference between the top cover and the bottom ring, the main shaft is connected with a radial-flow rotating wheel, spiral blades are arranged on the radial-flow rotating wheel, the spiral blades are uniformly distributed on the circumference by taking the main shaft as the center, the number of the spiral blades is more than 5, and the spiral blades spirally ascend around the axis of the main shaft. The lower part of the main shaft is provided with a drainage cone, the upper part of the main shaft is provided with drainage cone blades, and the lowest end of the main shaft is provided with an axial-flow runner. When water enters the runner chamber along the guide vane in a rotating manner, the oblique lower part of the spiral blade is pushed, the radial-flow runner rotates due to the component force in the tangential direction, and after the water flows through the guide vane, the water passes through the drainage cone and applies force to the blades of the drainage cone, namely the force is applied to the main shaft for the second time. Finally, water flows through the drainage cone and then applies force to the blades of the axial runner, namely the third force application to the main shaft, so that the rotating torque of the main shaft is increased.
Description
Technical Field
The invention relates to a mixed-flow water turbine, in particular to a double-runner mixed-flow water turbine, which belongs to fluid machinery and mainly uses water to generate electricity by utilizing a dam and store water to generate electricity.
Background
Chinese patent application No.: 201210524582.4, a method for improving the pressure pulsation of a francis turbine, a method for improving the pressure pulsation of the francis turbine, which comprises selecting a proper number of movable guide vanes Z g, determining a reasonable guide vane distribution circle diameter D g, determining a reasonable distance from a runner to a fixed edge, and the like, so as to improve the pressure pulsation in front of the runner behind the guide vanes of the francis turbine. This patent application seeks to reduce the pressure pulsations of francis turbines, which may result in hydraulic resonances between the rotating radial pressure modes and the runner or head structure, which resonances may cause strong vibrations, noise, cracks or damage to the moving vane bearings. Chinese patent application No.: 200510086922.X, "a francis turbine of H-type runner", runner blade (7) in article is what we usually see, the blade of francis turbine runner is basically parallel to basic shaft, when the maximum diameter of blade is between two guide vanes, the pressure is the biggest, when two adjacent blades are opposite to guide vane, the pressure is the minimum again, that is to say the pressure pulsation change that water pushed the runner is more a little sudden change, is one of the main causes of pressure pulsation. However, if the runner is provided with the helical blades, a helix angle exists between the helical blades and the main shaft, the stress of the runner can be improved to a great extent, and the operation of the mixed-flow water turbine is much smoother. In addition, an axial flow runner is added below a radial flow runner of the mixed-flow water turbine to increase the rotation moment of the main shaft.
Disclosure of Invention
In order to perfect a mixed-flow water turbine series, the invention provides a mixed-flow water turbine with double rotating wheels, which can reduce pressure pulsation during operation and obtain larger rotating moment.
The technical scheme adopted by the invention for solving the technical problems is as follows: the mixed-flow water turbine with double rotating wheels is provided with a rotating wheel, a main shaft is arranged in the middle of guide vanes which are uniformly distributed on the circumference between a top cover and a bottom ring, the main shaft is connected with a radial-flow rotating wheel, spiral blades are arranged on the radial-flow rotating wheel, the spiral blades are uniformly distributed on the circumference by taking the main shaft as the center, the number of the spiral blades is more than 5, and the spiral blades spirally ascend around the axis of the main shaft. The lower part of the main shaft is provided with a drainage cone, and the upper part of the main shaft is provided with a drainage cone blade. The lowest end of the main shaft is provided with an axial flow runner. Radial-flow rotors are referred to herein as opposed to axial-flow rotors and refer to wheels into which water flows and is propelled from the radial direction of the rotor.
The operation method of the francis turbine with the double rotating wheels is that when water enters the rotating wheel chamber along the guide vanes to rotate, the oblique lower part of the helical blade is pushed, the component force in the tangential direction enables the radial-flow type rotating wheel to rotate, the component force in the vertical direction can relieve the pressure of the gravity of the rotating part on the rotating wheel bearing, the service life of the bearing can be prolonged, the safe operation period is prolonged, the stressed area of the water between the guide vanes is gradually increased and then gradually reduced relative to the rotating helical blade, namely the pressure pulsation change of the radial-flow type rotating wheel pushed by the water is smooth, the operation stability can be improved, and the noise is low. After water flows through the guide vane, the water passes through the drainage cone and applies force to the blades of the drainage cone, namely the main shaft. Water passes through the drainage cone, finally flows through the drainage cone, and then applies force to the blades of the axial-flow type rotating wheel, so that the rotating torque of the main shaft is increased.
The mixed-flow water turbine with the double rotating wheels has the advantages that when water enters the runner chamber along the guide vanes in a rotating mode, the oblique lower side of the spiral blade is pushed, the radial-flow type runner rotates due to the tangential component force, the pressure of the gravity of the rotating part on the runner bearing can be relieved due to the vertical component force, the service life of the bearing can be prolonged, the safe operation period is prolonged, the stress area of the water between the guide vanes is gradually increased and then gradually reduced relative to the rotating spiral blade, the operation stability can be improved, and the noise is low. After flowing through the guide vane, the water passes through the drainage cone and applies force to the drainage cone blades 5, namely the main shaft 1 for the second time. Finally, water flows through the drainage cone and then applies force to the blades of the axial-flow type rotating wheel 8, namely, the third force is applied to the main shaft, so that the rotating torque of the main shaft is increased, and the water-cooled generator is more suitable for low-head power generation.
Drawings
FIG. 1 is a schematic view of a double-runner francis turbine
In fig. 1, 1 is a radial flow type runner, 2 is a helical blade, 3 is a main shaft, 4 is a guide vane, 5 is a drainage cone blade, 6 is a top cover, 7 is a bottom ring, and 8 is an axial flow type runner.
Detailed Description
In fig. 1, the francis turbine with two rotors has a rotor, a main shaft 3 is arranged in the middle of a guide vane 4 uniformly distributed on the circumference between a top cover 6 and a bottom ring 7, the main shaft 3 is connected with a radial-flow rotor 1, a helical blade 2 is arranged on the radial-flow rotor 1, the helical blade 2 is uniformly distributed on the circumference by taking the main shaft 3 as the center, the number of the helical blade 2 is more than 5, and the helical blade 2 spirally rises around the axis of the main shaft 3. The lower surface of the main shaft 3 is provided with a drainage cone, and the upper surface of the main shaft is provided with drainage cone blades 5. An axial flow runner 8 is mounted at the lowermost end of the main shaft 1.
The operation method of the francis turbine with the double rotating wheels is that when water enters the runner chamber along the guide vanes 4 in a rotating mode, the oblique lower side of the spiral blade 2 is pushed, the tangential component force enables the radial-flow type runner 1 to rotate, the vertical component force can relieve the pressure of the gravity of the rotating part on the runner bearing, the service life of the bearing can be prolonged, the safe operation period is prolonged, the stressed area of the water between the guide vanes 4 is gradually increased relative to the rotating spiral blade 2, and then the stressed area is gradually reduced, namely the pressure pulsation change of the radial-flow type runner 1 pushed by the water is smooth, the operation stability can be improved, and the noise is low. After flowing through the guide vane, the water passes through the drainage cone and applies force to the drainage cone blades 5, namely the main shaft 1 for the second time. Finally, water flows through the drainage cone and then applies force to the blades of the axial runner 8, namely the third force application to the main shaft, so that the rotating torque of the main shaft is increased.
Claims (2)
1. The mixed-flow water turbine with double rotating wheels is provided with a rotating wheel and is characterized in that: a main shaft (3) is arranged in the middle of guide vanes (4) which are uniformly distributed on the circumference between a top cover (6) and a bottom ring (7), the main shaft (3) is connected with a radial-flow type rotating wheel (1), spiral blades (2) are arranged on the radial-flow type rotating wheel (1), the spiral blades (2) are uniformly distributed on the circumference by taking the main shaft as the center, the number of the spiral blades (2) is more than 5, the spiral blades (2) spirally rise around the axis of the main shaft, and the spiral blades (2) are used for first-stage pushing; the lowest end of the main shaft is provided with an axial flow type rotating wheel, blades are arranged on the axial flow type rotating wheel (8), and the blades of the axial flow type rotating wheel (8) are used for three-stage pushing; the lower surface of the main shaft (3) is provided with a drainage cone, the upper surface of the main shaft is provided with a drainage cone blade (5), and the drainage cone blade (5) is used for two-stage pushing.
2. A method for operating a double-runner francis turbine, which is applied to the double-runner francis turbine of claim 1: when water enters the runner chamber along the guide vanes (4) in a rotating manner, the oblique lower side of the spiral blade (2) is pushed to apply force for the first stage of water, the radial-flow runner (1) is rotated by the component force in the tangential direction, the pressure of the gravity of the rotating part on the runner bearing can be relieved by the component force in the vertical direction, the service life of the bearing can be prolonged, the safe operation period is prolonged, the stressed area of the water between the guide vanes (4) is gradually increased and then gradually reduced relative to the rotating spiral blade (2), namely, the pressure pulsation change of the radial-flow runner pushed by the water is smoother, the operation stability can be increased, and the noise is low;
the water flows to the drainage cone after passing through the spiral blade (2), and applies force to the blade (5) of the drainage cone to apply force to the second stage of the water;
water passes through the drainage cone, then applies force to the blades of the axial-flow type rotating wheel (8) and applies force to the third stage of the water, so that the rotating torque of the main shaft (3) is increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710231291.9A CN108691717B (en) | 2017-04-11 | 2017-04-11 | Mixed-flow water turbine with double rotating wheels |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710231291.9A CN108691717B (en) | 2017-04-11 | 2017-04-11 | Mixed-flow water turbine with double rotating wheels |
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| Publication Number | Publication Date |
|---|---|
| CN108691717A CN108691717A (en) | 2018-10-23 |
| CN108691717B true CN108691717B (en) | 2020-10-09 |
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| CN201710231291.9A Active CN108691717B (en) | 2017-04-11 | 2017-04-11 | Mixed-flow water turbine with double rotating wheels |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109945102B (en) * | 2019-03-19 | 2021-10-26 | 佛山市南海顺展模具灯饰金属制品有限公司 | Cake brush automatically cleaning fountain LED underwater lamp |
| CN109958929B (en) * | 2019-03-19 | 2021-10-26 | 佛山市南海顺展模具灯饰金属制品有限公司 | Automatically cleaning fountain LED underwater lamp |
| CN111720252A (en) * | 2020-05-11 | 2020-09-29 | 华北水利水电大学 | Mixed-flow and axial-flow runner combined two-stage water turbine |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2172352Y (en) * | 1993-07-25 | 1994-07-20 | 黄国宏 | Hydrautic turbine revolving wheel with 2 impellers |
| DE4406338C2 (en) * | 1994-02-26 | 1996-03-21 | Gerhard Fink | Double curved blade for Francis water turbines |
| CN202690307U (en) * | 2012-08-18 | 2013-01-23 | 冯立才 | Three powers mixed-flow high efficient water turbine |
| CN203374421U (en) * | 2013-07-17 | 2014-01-01 | 天津市凯达重型水电设备制造有限公司 | Novel water turbine |
| CN103790857A (en) * | 2014-03-05 | 2014-05-14 | 肖明训 | Compound mixed-flow impeller |
| CN203962464U (en) * | 2014-06-04 | 2014-11-26 | 清华大学 | The mixed flow pump turbine runner of decline slant height flanging |
| CN204212908U (en) * | 2014-11-20 | 2015-03-18 | 广东梅雁吉祥水电股份有限公司 | A kind of Francis turbine |
| CN205013187U (en) * | 2015-09-07 | 2016-02-03 | 淄博永华滤清器制造有限公司 | Embedded impeller of blade |
-
2017
- 2017-04-11 CN CN201710231291.9A patent/CN108691717B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2172352Y (en) * | 1993-07-25 | 1994-07-20 | 黄国宏 | Hydrautic turbine revolving wheel with 2 impellers |
| DE4406338C2 (en) * | 1994-02-26 | 1996-03-21 | Gerhard Fink | Double curved blade for Francis water turbines |
| CN202690307U (en) * | 2012-08-18 | 2013-01-23 | 冯立才 | Three powers mixed-flow high efficient water turbine |
| CN203374421U (en) * | 2013-07-17 | 2014-01-01 | 天津市凯达重型水电设备制造有限公司 | Novel water turbine |
| CN103790857A (en) * | 2014-03-05 | 2014-05-14 | 肖明训 | Compound mixed-flow impeller |
| CN203962464U (en) * | 2014-06-04 | 2014-11-26 | 清华大学 | The mixed flow pump turbine runner of decline slant height flanging |
| CN204212908U (en) * | 2014-11-20 | 2015-03-18 | 广东梅雁吉祥水电股份有限公司 | A kind of Francis turbine |
| CN205013187U (en) * | 2015-09-07 | 2016-02-03 | 淄博永华滤清器制造有限公司 | Embedded impeller of blade |
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| CN108691717A (en) | 2018-10-23 |
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Effective date of registration: 20200908 Address after: No.1 Jingyi Road, Qianlin village, Jinfeng Town, Changle District, Fuzhou City, Fujian Province, 350005 Applicant after: Fuzhou Luosheng Technology Co.,Ltd. Applicant after: Fujian Shuikou Power Generation Group Co.,Ltd. Address before: 443002 Shiziling Road, Xiling District, Yichang City, Hubei Province, 10-102 Applicant before: Xu Changyi |
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Effective date of registration: 20220704 Address after: 350005 No.1 Jingyi Road, Qianlin village, Jinfeng Town, Changle District, Fuzhou City, Fujian Province Patentee after: Fuzhou Luosheng Technology Co.,Ltd. Address before: 350005 No.1 Jingyi Road, Qianlin village, Jinfeng Town, Changle District, Fuzhou City, Fujian Province Patentee before: Fuzhou Luosheng Technology Co.,Ltd. Patentee before: Fujian Shuikou Power Generation Group Co., Ltd |