CN111535971A - Low specific speed mixed-flow water turbine with double-inlet volute - Google Patents
Low specific speed mixed-flow water turbine with double-inlet volute Download PDFInfo
- Publication number
- CN111535971A CN111535971A CN202010395125.4A CN202010395125A CN111535971A CN 111535971 A CN111535971 A CN 111535971A CN 202010395125 A CN202010395125 A CN 202010395125A CN 111535971 A CN111535971 A CN 111535971A
- Authority
- CN
- China
- Prior art keywords
- blade
- section
- double
- follows
- curved surface
- 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.)
- Pending
Links
Images
Classifications
-
- 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
- F03B3/186—Spiral or volute casings
-
- 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
- F03B3/02—Machines or engines of reaction type; Parts or details peculiar thereto with radial flow at high-pressure side and axial flow at low-pressure side of rotors, e.g. Francis turbines
-
- 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
-
- 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
- F03B3/125—Rotors for radial flow at high-pressure side and axial flow at low-pressure side, e.g. for Francis-type turbines
-
- 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 invention discloses a low specific speed mixed-flow water turbine with a double-inlet volute, wherein a connecting seat ring is arranged at an annular opening at the inner side of the double-inlet volute, a circle of fixed guide vanes are arranged on the outer periphery of the connecting seat ring, and a circle of movable guide vanes are arranged on the inner periphery of the connecting seat ring; a rotating wheel is sleeved at the inner ring of the connecting seat ring, and the lower part of the connecting seat ring is connected with the front end of the draft tube; the blade in the runner is set as an X-shaped non-uniform-thickness twisted blade, and the front surface and the back surface of the blade are smoothly connected by curved surfaces with different curvatures from top to bottom. The two water inlets of the low-specific-speed water turbine are directly connected with the water inlet pipeline, so that bidirectional water inlet is realized, the uniformity of water flow in the circumferential direction in the volute is improved, the velocity component of the water flow in the circumferential direction is enhanced, the flow circulation of incoming flow is effectively increased, the flow condition of the water entering the water distributor is improved, the hydraulic loss of the water distributor is reduced, and the low-specific-speed water turbine has good hydraulic performance and operation efficiency.
Description
Technical Field
The invention relates to a low specific speed mixed-flow water turbine with a double-inlet volute, belonging to the technical field of water turbines.
Background
The mixed flow water turbine is one of the most widely used water turbines, and its main components include water guiding chamber, seat ring, water guiding mechanism, runner and tail pipe. The volute is used as a water diversion component of the water turbine, and has the function of enabling water flow to form a ring amount from the hydraulic viewpoint so as to ensure that the water flow can enter the seat ring and the movable guide vane at a smaller attack angle and reduce the hydraulic loss of the water guide mechanism.
In the prior art, all sections of the volute-shaped structure section are set to be oval, so that the diameter of the rotating wheel is effectively increased, and the output of a unit is increased. But it only changes the shape of the volute section and does not optimize the water inlet condition.
In addition, the existing volutes are designed with one-way water inlets, and the section of the volute-shaped structural section is gradually reduced to form necessary circulation quantity in front of the water distributor. When the water flow passes through the cross section of the inlet of the volute to the cross section of the nose end, the tangential component velocity change of the water flow is greatly influenced by the size of the cross section and cannot ideally form axisymmetric potential flow. Therefore, how to overcome the defects of the prior art becomes one of the key problems to be solved in the technical field of the mixed-flow water turbine.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a low specific speed mixed-flow water turbine with a double-inlet volute. The water turbine provided by the invention adopts the double-inlet volute, the two water inlets are directly connected with the water inlet pipeline to realize bidirectional water inlet, the uniformity of water flow in the volute in the circumferential direction is improved, the velocity component of the water flow in the circumferential direction is enhanced, the water flow circulation quantity of incoming flow is further effectively increased, the water flow condition entering the water distributor is improved, the hydraulic loss of the water distributor is reduced, and the water turbine has the advantages of good hydraulic performance, high operation efficiency and the like.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a low specific speed francis turbine with a double-inlet volute, comprising: the double-inlet volute comprises a double-inlet volute body, wherein a connecting seat ring is arranged at an annular opening at the inner side of the double-inlet volute body, a circle of fixed guide vanes are arranged on the outer periphery of the connecting seat ring, and a circle of movable guide vanes are arranged on the inner periphery of the connecting seat ring; a rotating wheel is sleeved at the inner ring of the connecting seat ring, and the lower part of the connecting seat ring is connected with the front end of the draft tube; blade sets up to the unequal thickness distortion blade of X type in the runner, and the front and the reverse side of blade are from last to down by the curved surface smooth connection of different curvatures, and the blade is openly and the reverse side is from last to down the section airfoil curve of curved surface set up as follows:
at the position 300mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.07445×10-10x4-1.06906×10-6x3+0.00189x2-1.78478x+1985.33857
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝3.67211×10-10x4-1.9684×10-6x3+0.0038x2-3.75747x+2775.22663
at a position 750mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.81825×10-10x4-1.63249×10-6x3+0.00341x2-3.54085x+2770.96041
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝4.42393×10-10x4-2.55909×10-6x3+0.00541x2-5.59629x+3584.33155
at a position 1200mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.67904×10-10x4-1.63281×10-6x3+0.00357x2-3.80311x+2947.77258
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝1.87767×10-10x4-9.51401×10-6x3+0.00165x2-1.7269x+2185.24717
at the position 1400mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.37545×10-10x4-1.4211×10-6x3+0.003x2-3.09592x+2706.90916
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝9.8202×10-11x4-3.18238×10-7x3-7.27422×10-5x2+0.3767x+1331.66
at a position 1650mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝4.04396×10-10x4-2.30768×10-6x3+0.00467x2-4.31974x+3147.897
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝1.35858×10-10x4-4.28545×10-7x3-2.4933×10-4x2+1.2119x+895.416
at the position 2150mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝3.851×10-9x4-2.44629×10-6x3+0.05845x2-62.47826x+26998.258
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝2.7264×10-9x4-1.82964×10-5x3+0.0461x2-52.04158x+24003.63848。
as a preferred scheme, the outlet diffusion section of the draft tube is provided with a middle buttress, and the tail end of the middle buttress is connected with two symmetrical water outlets.
Preferably, the double-inlet volute comprises a volute-shaped structure section and two nose-end straight pipe sections, and the two nose-end straight pipe sections are arranged in the volute-shaped structure section in a central symmetry manner in the circumferential direction.
As preferred scheme, be equipped with annular opening on the inboard lateral wall of snail form structure section, annular opening is connected with the outer ring edge of connecting seat ring, and connecting seat ring includes: the outer periphery between the upper ring and the lower ring is provided with a circle of fixed guide vanes at equal intervals, and the inner periphery between the upper ring and the lower ring is provided with rotatable movable guide vanes at equal intervals through a rotating shaft.
Preferably, the cross section of the volute structure section is an elliptical cross section, and the length ratio of a long half shaft to a short half shaft of the elliptical cross section is 1.05-1.5: 1.
preferably, the runner is a mixed-flow runner, the mixed-flow runner comprises an upper crown, a lower ring part, blades and a drainage cone, a circle of blades are arranged below the upper crown at equal intervals, the lower ring part is arranged on the periphery of the circle of blades, and the drainage cone is arranged in the middle of the circle of blades.
Preferably, the number of the blades in the runner is 14-19.
Has the advantages that: compared with the prior art, the low specific speed mixed-flow water turbine with the double-inlet volute provided by the invention has the remarkable advantages that: the water turbine provided by the invention adopts the double-inlet volute, the two water inlets are directly connected with the water inlet pipeline to realize bidirectional water inlet, the uniformity of water flow in the volute in the circumferential direction is improved, the velocity component of the water flow in the circumferential direction is enhanced, the water flow circulation quantity of incoming flow is further effectively increased, the water flow condition entering the water distributor is improved, the hydraulic loss of the water distributor is reduced, and the low-specific-speed water turbine has good hydraulic performance and operation efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a low specific speed francis turbine with a double-inlet volute according to the present invention.
Fig. 2 is a schematic view of the structure of the rotary wheel provided by the invention.
Fig. 3 is a schematic view of a blade in the rotor according to the present invention.
FIG. 4 is a schematic view of airfoil curves on a blade at different horizontal axial distances from the rotor crown according to the present invention.
Fig. 5 is a schematic view of a dual-inlet volute structure according to the present invention.
Fig. 6 is a schematic cross-sectional view of a connecting seat ring according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the low specific speed mixed-flow water turbine with the double-inlet volute provided by the invention sequentially comprises a double-inlet volute 1, fixed guide vanes 2, movable guide vanes 3, a rotating wheel 4 and a draft tube 5 according to a water inlet direction, wherein a connecting seat ring 6 is arranged at an annular opening at the inner side of the double-inlet volute, a circle of fixed guide vanes 2 is arranged at the outer periphery of the connecting seat ring 6, and a circle of movable guide vanes 3 is arranged at the inner periphery of the connecting seat ring 6; the inner ring of the connecting seat ring 6 is sleeved with a rotating wheel 4, and the lower part of the connecting seat ring 6 is connected with the front end of the tail water pipe 5.
As shown in fig. 2, the runner 4 is a mixed-flow runner, and includes an upper crown 401, a lower ring 402, blades 403 and a drainage cone 404, a circle of blades 403 is arranged below the upper crown 401 at equal intervals, the lower ring 402 is arranged on the periphery of the circle of blades 403, and the drainage cone 404 is arranged in the middle of the circle of blades 403.
As shown in FIG. 3, the number of the blades 403 in the runner 4 is 14-19. The blade 403 is an X-shaped non-uniform-thickness twisted blade, the front side and the back side of the blade 403 are smoothly connected by curved surfaces with different curvatures from top to bottom, and the wing profile close to the upper crown is of a negative curvature, so that the elimination of cross flow on the front side of the blade is facilitated.
As shown in fig. 4, the front and back of the blade 403 have the following curved surface profile from top to bottom:
the values of the point coordinates on the airfoil curves of the front and back sections of the blade 403 at a distance of 300mm from the horizontal axis of the crown are shown in table 1.
TABLE 1
The two curves fitted are respectively represented as:
the front side of the blade is as follows:
y＝2.07445×10-10x4-1.06906×10-6x3+0.00189x2-1.78478x+1985.33857
the reverse side of the blade:
y＝3.67211×10-10x4-1.9684×10-6x3+0.0038x2-3.75747x+2775.22663
the values of the point coordinates on the airfoil curves of the front and back sections of the blade 403 at a distance of 750mm from the horizontal axis of the crown are shown in table 2.
TABLE 2
The two curves fitted are respectively represented as:
the front side of the blade is as follows:
y＝2.81825×10-10x4-1.63249×10-6x3+0.00341x2-3.54085x+2770.96041
the reverse side of the blade:
y＝4.42393×10-10x4-2.55909×10-6x3+0.00541x2-5.59629x+3584.33155
the values of the point coordinates on the airfoil curves of the front and back sections of the blade 403 at a distance of 1200mm from the horizontal axis of the crown are shown in table 3.
TABLE 3
The two curves fitted are respectively represented as:
the front side of the blade is as follows:
y＝2.67904×10-10x4-1.63281×10-6x3+0.00357x2-3.80311x+2947.77258
the reverse side of the blade:
y＝1.87767×10-10x4-9.51401×10-6x3+0.00165x2-1.7269x+2185.24717
the values of the coordinates of the points on the airfoil curves of the front and back sections of the blade 403 at a distance of 1400mm from the horizontal axis of the crown are shown in table 4.
TABLE 4
The two curves fitted are respectively represented as:
the front side of the blade is as follows:
y＝2.37545×10-10x4-1.4211×10-6x3+0.003x2-3.09592x+2706.90916
the reverse side of the blade:
y＝9.8202×10-11x4-3.18238×10-7x3-7.27422×10-5x2+0.3767x+1331.66
the values of the point coordinates on the airfoil curves for the front and back sections of the blade 403 at 1650mm from the horizontal axis of the crown are shown in table 5.
TABLE 5
The two curves fitted are respectively represented as:
the front side of the blade is as follows:
y＝4.04396×10-10x4-2.30768×10-6x3+0.00467x2-4.31974x+3147.897
the reverse side of the blade:
y＝1.35858×10-10x4-4.28545×10-7x3-2.4933×10-4x2+1.2119x+895.416
the values of the point coordinates on the airfoil curves of the front and back sections of the blade 403 at 2150mm from the horizontal axis of the crown are shown in table 6.
TABLE 6
The two curves fitted are respectively represented as:
the front side of the blade is as follows:
y＝3.851×10-9x4-2.44629×10-6x3+0.05845x2-62.47826x+26998.258
the reverse side of the blade:
y＝2.7264×10-9x4-1.82964×10-5x3+0.0461x2-52.04158x+24003.63848
as shown in fig. 5, the dual-inlet volute 1 includes a volute-shaped structural section 101 and two nose-end straight pipe sections 102, and the volute-shaped structural section 101 is centrally symmetrically provided with the two nose-end straight pipe sections 102 in the circumferential direction.
As shown in fig. 6, an annular opening is provided on the inner side wall of the volute structure section 101, the annular opening is connected with the outer annular edge of the connecting seat ring 6, and the connecting seat ring 6 includes: the device comprises an upper ring 601 and a lower ring 602, wherein a circle of fixed guide vanes 2 are arranged on the outer periphery between the upper ring and the lower ring at equal intervals, and a rotatable movable guide vane 3 is arranged on the inner periphery between the upper ring and the lower ring at equal intervals through a rotating shaft.
The centers of the double-inlet volute 1, the connecting seat ring 6, the rotating wheel 4 and the draft tube 5 are on the same vertical axis.
The inlet section of the worm-shaped structure section 6 is an oval section, and the length ratio of the long half shaft to the short half shaft is 1.05-1.5: 1. the two nose end straight pipe sections 7 are directly communicated with a water inlet pipeline.
The outlet diffusion section of the draft tube 5 is provided with a middle buttress, and the tail end of the middle buttress is connected with two symmetrical water outlets.
Example 1:
the number of the fixed guide vanes 2 is 15-20. The number of the movable guide vanes 3 is set to be 20-30.
Example 2:
taking a mixed-flow water turbine with a double-inlet volute provided by the invention applied to a certain power station as an example, the water head 76m of the power station is designed to have the flood flow of 25500m3/s, and the specific rotating speed of the water turbine is 196m kW.
The optimized design parameters of the invention are as follows: the ratio of the long axis to the short axis of the elliptical cross section of the volute-shaped structure section of the double-inlet volute is 1.05: 1; the number of the fixed guide vanes is 12; the number of movable guide vanes is 24; the inlet diameter and the outlet diameter of the rotating wheel are 5400mm and 6050mm respectively; the number of the blades is 14; the draft tube adopts elbow-shaped draft tube, the elevation angle of the top plate of the water outlet diffusion section is 11 degrees, and the width of the middle buttress is 2000 mm.
Example 3:
the specific application process of the invention is as follows: pressurized water flow in the water inlet channel enters from the water inlets of the two nose end straight pipe sections, and tangential flow which is centrosymmetric is generated in the circumferential direction of the double-inlet volute, so that the water flow generates enough circulation before entering the water distributor, the water flowing out of the water distributor enters the runner area to drive the runner to rotate to do work, and the potential energy and the kinetic energy of the water flow are converted into mechanical energy. The water flow comes out of the rotating wheel and is discharged to the downstream through the tail water pipe.
Descriptions not related to the embodiments of the present invention are well known in the art, and may be implemented by referring to the well-known techniques.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (7)
1. The utility model provides a take low specific speed mixed-flow turbine of two import formula volutes which characterized in that: the method comprises the following steps: the double-inlet volute comprises a double-inlet volute body, wherein a connecting seat ring is arranged at an annular opening at the inner side of the double-inlet volute body, a circle of fixed guide vanes are arranged on the outer periphery of the connecting seat ring, and a circle of movable guide vanes are arranged on the inner periphery of the connecting seat ring; a rotating wheel is sleeved at the inner ring of the connecting seat ring, and the lower part of the connecting seat ring is connected with the front end of the draft tube; blade sets up to the unequal thickness distortion blade of X type in the runner, and the front and the reverse side of blade are from last to down by the curved surface smooth connection of different curvatures, and the blade is openly and the reverse side is from last to down the section airfoil curve of curved surface set up as follows:
at the position 300mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.07445×10-10x4-1.06906×10-6x3+0.00189x2-1.78478x+1985.33857
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝3.67211×10-10x4-1.9684×10-6x3+0.0038x2-3.75747x+2775.22663
at a position 750mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.81825×10-10x4-1.63249×10-6x3+0.00341x2-3.54085x+2770.96041
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝4.42393×10-10x4-2.55909×10-6x3+0.00541x2-5.59629x+3584.33155
at a position 1200mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.67904×10-10x4-1.63281×10-6x3+0.00357x2-3.80311x+2947.77258
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝1.87767×10-10x4-9.51401×10-6x3+0.00165x2-1.7269x+2185.24717
at the position 1400mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝2.37545×10-10x4-1.4211×10-6x3+0.003x2-3.09592x+2706.90916
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝9.8202×10-11x4-3.18238×10-7x3-7.27422×10-5x2+0.3767x+1331.66
at a position 1650mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝4.04396×10-10x4-2.30768×10-6x3+0.00467x2-4.31974x+3147.897
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝1.35858×10-10x4-4.28545×10-7x3-2.4933×10-4x2+1.2119x+895.416
at the position 2150mm away from the horizontal axis of the upper crown, the section airfoil curve formula of the curved surface of the front surface of the blade is as follows:
y＝3.851×10-9x4-2.44629×10-6x3+0.05845x2-62.47826x+26998.258
the section airfoil curve formula of the curved surface of the reverse surface of the blade is as follows:
y＝2.7264×10-9x4-1.82964×10-5x3+0.0461x2-52.04158x+24003.63848。
2. the low specific speed francis turbine with a double-inlet volute according to claim 1, wherein: the outlet diffusion section of the draft tube is provided with a middle buttress, and the tail end of the middle buttress is connected with two symmetrical water outlets.
3. The low specific speed francis turbine with a double-inlet volute according to claim 2, wherein: the double-inlet volute comprises a volute-shaped structure section and two nose end straight pipe sections, wherein the two nose end straight pipe sections are symmetrically arranged in the center of the volute-shaped structure section in the circumferential direction.
4. The low specific speed francis turbine with a double inlet volute according to claim 3, wherein: be equipped with annular opening on the inboard lateral wall of snail form structure section, annular opening is connected with connection seat ring outer ring edge, and connection seat ring includes: the outer periphery between the upper ring and the lower ring is provided with a circle of fixed guide vanes at equal intervals, and the inner periphery between the upper ring and the lower ring is provided with rotatable movable guide vanes at equal intervals through a rotating shaft.
5. The low specific speed francis turbine with a double inlet volute according to claim 3, wherein: the cross section of the worm-shaped structure section is an elliptical section, and the length ratio of a long half shaft to a short half shaft of the elliptical section is 1.05-1.5: 1.
6. the low specific speed francis turbine with a double-inlet volute according to claim 2, wherein: the runner adopts the mixed flow runner, the mixed flow runner includes crown, lower ring portion, blade and sluicing awl, equal interval arrangement has the round blade in crown below, and the round blade periphery is provided with lower ring portion, is provided with the sluicing awl in the middle of the round blade.
7. The low specific speed francis turbine with a double-inlet volute according to claim 1, wherein: the number of the blades in the rotating wheel is 14-19.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010395125.4A CN111535971A (en) | 2020-05-11 | 2020-05-11 | Low specific speed mixed-flow water turbine with double-inlet volute |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010395125.4A CN111535971A (en) | 2020-05-11 | 2020-05-11 | Low specific speed mixed-flow water turbine with double-inlet volute |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111535971A true CN111535971A (en) | 2020-08-14 |
Family
ID=71967969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010395125.4A Pending CN111535971A (en) | 2020-05-11 | 2020-05-11 | Low specific speed mixed-flow water turbine with double-inlet volute |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111535971A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201155405Y (en) * | 2008-02-04 | 2008-11-26 | 卜雪 | Double water inlet type energy-saving hydroturbine |
| CN101560940A (en) * | 2009-05-27 | 2009-10-21 | 南京星飞冷却设备有限公司 | Direct connection low-speed small-scale mixed-flow turbine applied in hydrodynamic energy-saving cooling tower |
| CN102536591A (en) * | 2012-02-07 | 2012-07-04 | 戴会超 | Mixed-flow type water turbine for increasing survival rate of fishes |
| CN202560432U (en) * | 2012-01-11 | 2012-11-28 | 翁芳明 | Self-circulation lubricating system water turbine with bearing for cooling tower |
| CN103206331A (en) * | 2013-02-07 | 2013-07-17 | 河海大学 | Low-head efficient shaft-extension tubular pump turbine and blades thereof |
| US9322385B1 (en) * | 2013-02-07 | 2016-04-26 | Martin D. Hallett | Hydro vortex enabled turbine generator |
| CN108223386A (en) * | 2017-11-30 | 2018-06-29 | 河海大学 | A kind of large-scale bulb through-flow pump installation |
-
2020
- 2020-05-11 CN CN202010395125.4A patent/CN111535971A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201155405Y (en) * | 2008-02-04 | 2008-11-26 | 卜雪 | Double water inlet type energy-saving hydroturbine |
| CN101560940A (en) * | 2009-05-27 | 2009-10-21 | 南京星飞冷却设备有限公司 | Direct connection low-speed small-scale mixed-flow turbine applied in hydrodynamic energy-saving cooling tower |
| CN202560432U (en) * | 2012-01-11 | 2012-11-28 | 翁芳明 | Self-circulation lubricating system water turbine with bearing for cooling tower |
| CN102536591A (en) * | 2012-02-07 | 2012-07-04 | 戴会超 | Mixed-flow type water turbine for increasing survival rate of fishes |
| CN103206331A (en) * | 2013-02-07 | 2013-07-17 | 河海大学 | Low-head efficient shaft-extension tubular pump turbine and blades thereof |
| US9322385B1 (en) * | 2013-02-07 | 2016-04-26 | Martin D. Hallett | Hydro vortex enabled turbine generator |
| CN108223386A (en) * | 2017-11-30 | 2018-06-29 | 河海大学 | A kind of large-scale bulb through-flow pump installation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101327340B1 (en) | Direct-connection low-speed small mixed-flow hydroturbine for hydrodynamic energy-saving cooling tower | |
| WO2023077648A1 (en) | Self-adaptive design method for bulb tubular pump guide vane, and bulb tubular pump guide vane | |
| CN111594369A (en) | Mixed-flow water turbine with double-inlet volute suitable for cooling tower | |
| CN102536590B (en) | Two-stage through-flow turbine with ultralow specific speed | |
| CN111535974A (en) | Low-water-head large-flow mixed-flow water turbine with double-inlet volute | |
| CN201083177Y (en) | Draft tube | |
| CN101344059B (en) | Reverse S type runner of mixed-flow turbine | |
| CN108361205B (en) | Centrifugal pump impeller and LNG immersed pump comprising same | |
| CN103912434B (en) | A kind of small power station's axial flow water turbine equipment | |
| CN113236607A (en) | Design method of large-scale engineering pump volute and volute thereof | |
| CN109139334B (en) | Mixed-flow long-short blade water turbine | |
| CN109441691B (en) | Mixed-flow water turbine with tail water pipe and rectifying plate | |
| CN103216374A (en) | Low-specific speed small mixed flow water turbine | |
| CN111535973A (en) | Low specific speed double-inlet volute mixed-flow water turbine suitable for cooling tower | |
| CN104832460A (en) | Diffuse type diversion ring matched with radial asymmetric guide blade bodies of pump | |
| CN115585140A (en) | Shaftless high-cavitation-resistance low-amplitude vibration reversible axial flow fluid machine | |
| CN203214227U (en) | Small mixed-flow water turbine for water-cooling tower system | |
| CN111535971A (en) | Low specific speed mixed-flow water turbine with double-inlet volute | |
| CN111577508A (en) | High-specific-speed axial flow water turbine with double-inlet volute | |
| CN100427753C (en) | Mixed flow type water turbin having H-type flow path rotary wheel | |
| US1748892A (en) | Hydraulic process and apparatus | |
| CN105863930B (en) | A kind of small all-in-one turbine-generator units | |
| CN112360660B (en) | Long and short blade type reversible pump turbine | |
| CN204610293U (en) | A kind of turbo machine | |
| CN103953491A (en) | Direct-drive runoff water turbine for hydrodynamic cooling tower |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200814 |
|
| RJ01 | Rejection of invention patent application after publication |