CN113737748A - Well type water inlet and outlet structure adopting S-shaped bent pipe - Google Patents
Well type water inlet and outlet structure adopting S-shaped bent pipe Download PDFInfo
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- CN113737748A CN113737748A CN202110951951.7A CN202110951951A CN113737748A CN 113737748 A CN113737748 A CN 113737748A CN 202110951951 A CN202110951951 A CN 202110951951A CN 113737748 A CN113737748 A CN 113737748A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
- E02B9/04—Free-flow canals or flumes; Intakes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
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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 invention discloses a well type water inlet and outlet structure adopting an S-shaped bent pipe, which comprises a flow distribution body, a vertical well, a bent pipe and a flat tunnel which are sequentially connected from top to bottom, wherein the bent pipe consists of an upper arc bent pipe and a lower arc bent pipe, the upper arc bent pipe and the lower arc bent pipe are two sections of reverse arc bent pipes, and the axes of the flow distribution body, the vertical well, the upper arc bent pipe, the lower arc bent pipe and the flat tunnel are on the same plane and are vertical to the ground. After the lower bent pipe section of the well type water inlet and outlet is changed into an S-shaped equal-diameter bent pipe from a spindle shape, the outflow of each orifice at the upper part of the vertical shaft is more uniform under the water pumping working condition, so that the problem of uneven distribution of flow velocity on the plane and the vertical direction of each orifice can be solved, the negative flow velocity at the bottom of the section of the trash rack disappears, the water head loss is obviously reduced, the economic benefit is high, and all hydraulic indexes can meet the design and standard requirements under the combined working condition. Compared with the traditional body type, the body type and the structural design are simplified, the hydraulic condition is better, and the device is worthy of being widely popularized and applied in pumped storage projects.
Description
Technical Field
The invention relates to a water inlet and outlet for pumped storage power station engineering, in particular to a well type water inlet and outlet structure which can improve the plane and vertical distribution of flow velocity and can eliminate the negative flow velocity at the bottom of a trash rack orifice and adopts an S-shaped bent pipe.
Background
The water inlet and outlet of the pumped storage power station mainly has two types, namely a side type water inlet and outlet and a well type water inlet and outlet, the well type water inlet and outlet can be arranged at any position of the bottom of a basin of a warehouse, the arrangement is flexible, the problem that the water inlet and outlet pass a dam can be well solved, the water inlet and outlet of the domestic pumped storage power stations such as the Xilong pond, the Liyang and the Yimeng adopt the well type water inlet and outlet, and the application is increasingly wide. The pumped storage power station has two operation working conditions of pumping and power generation, water flow is bidirectional and is influenced by a bent pipe section at the bottom of a vertical shaft, and the well type water inlet and outlet have the hydraulics problems of uneven flow distribution ratio of each flow passage, large flow velocity distribution coefficient of the cross section of a trash rack, negative flow velocity at the bottom and the like under the pumping working condition, so that the engineering operation is adversely affected. The traditional bottom elbow of the well-type water inlet and outlet adopts a spindle shape, on the basis, a large amount of numerical analysis and model test research work is carried out before and after scientific research personnel, but the substantial improvement is still not obtained, so that the idea needs to be changed urgently to find an effective method, a novel structural form of the well-type water inlet and outlet is developed, and the hydraulic problem is solved thoroughly.
Disclosure of Invention
The invention aims to solve the technical problem of providing a well type water inlet and outlet structure adopting an S-shaped bent pipe, and solving the problem of poor hydraulic conditions of flow passages of orifices under the working condition of pumping.
In order to solve the technical problems, the invention adopts the technical scheme that: a well type water inlet and outlet structure adopting an S-shaped bent pipe comprises a flow distribution body, a vertical well, a bent pipe and a flat tunnel which are sequentially connected from top to bottom, wherein the bent pipe comprises an upper arc bent pipe and a lower arc bent pipe, the upper arc bent pipe and the lower arc bent pipe are two sections of reverse arc bent pipes, and the axes of the flow distribution body, the vertical well, the upper arc bent pipe, the lower arc bent pipe and the flat tunnel are on the same plane and are vertical to the ground.
The shaft is composed of a diffuser section and a straight pipe section.
The cross sections of the upper arc bent pipe and the lower arc bent pipe are circular equal-diameter pipes, and the diameters of the upper arc bent pipe and the lower arc bent pipe are the same as the diameters of the vertical shaft straight pipe and the flat tunnel.
The axis of the upper arc elbow is tangent to the axis of the lower arc elbow, the axis of the upper arc elbow is also tangent to the axis of the vertical shaft, and the axis of the lower arc elbow is also tangent to the axis of the horizontal tunnel.
The turning radii of the upper arc elbow and the lower arc elbow are equal, and the corner of the lower arc elbow is larger than that of the upper arc elbow.
The invention has the beneficial effects that: after the lower bent pipe section of the well type water inlet and outlet is changed into an S-shaped equal-diameter bent pipe from a spindle shape, the outflow at the upper part of the vertical shaft tends to be more uniform, so that the problem of uneven flow velocity distribution in the water pumping working condition can be solved, meanwhile, the negative flow velocity at the bottom of the cross section of the trash rack disappears, the head loss is reduced, and various hydraulic indexes under the combined working condition can meet the design and specification requirements. Compared with the traditional body type, the invention has simpler body type design and better hydraulic conditions, and is worthy of wide popularization and application in pumped storage projects.
Drawings
FIG. 1 is a schematic elevation view of a well-type water inlet and outlet structure of the present invention employing an S-bend;
FIG. 2 is a schematic plan view of a well-type water inlet/outlet structure using an S-shaped elbow pipe according to the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "reverse", "top/bottom", "upper/lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 and 2, the well type water inlet and outlet structure adopting the S-shaped elbow pipe of the invention 1 comprises a flow distribution body 1, a vertical well 2, an elbow pipe and a flat tunnel 4 which are connected in sequence from top to bottom, wherein the elbow pipe is composed of an upper arc elbow pipe 31 and a lower arc elbow pipe 32, the upper arc elbow pipe 31 and the lower arc elbow pipe 32 are two reverse arc elbow pipes, and the axes of the flow distribution body 1, the vertical well 2, the upper arc elbow pipe 31, the lower arc elbow pipe 32 and the flat tunnel 4 are on the same plane and are vertical to the ground.
The shaft 2 consists of a diffuser section and a straight pipe section. The cross sections of the upper arc elbow 31 and the lower arc elbow 32 are circular equal-diameter pipes, and the diameters of the upper arc elbow 31 and the lower arc elbow are the same as the diameters of the vertical shaft 2 straight pipe and the flat hole 4. The axes of the upper arc elbow 31 and the lower arc elbow 32 are tangent, the axis of the upper arc elbow 31 is also tangent to the axis of the vertical shaft, and the axis of the lower arc elbow 32 is also tangent to the axis of the flat hole 4. The turning radii of the upper arc elbow 31 and the lower arc elbow 32 are equal, and the corner of the lower arc elbow 32 is larger than the corner of the upper arc elbow 31.
The working principle of the invention is as follows: the water inlet and outlet are in outflow state under the pumping working condition, and after water flow enters the vertical shaft 2 from the flat tunnel 4, the flow direction is changed, the flow rate in the vertical shaft is uneven, and the flow distribution of each orifice of the flow distribution body 1 is uneven. After the vertical shaft 1 and the flat tunnel 4 are connected by adopting the combined bent pipe, the flow velocity in the vertical shaft 2 is more uniform after the water flow is turned twice in opposite directions, so that a series of hydraulic problems of uneven flow distribution of orifices of a water inlet and a water outlet, negative flow velocity at the bottom and the like are solved.
The following further description takes a certain large pumped storage power station project adopting the technical scheme of the invention as an example and combines the accompanying drawings:
in a large pumped storage power station project, an upper reservoir adopts a well-type water inlet and outlet and is positioned at the southeast side of a reservoir basin. The upper reservoir has 2 water inlets and water outlets which are the same in size and are arranged in parallelThe arrangement is that in order to solve the problems of water flow state and the like in outflow, the water inlet and outlet structural body is applied, and the water inlet and outlet structural body consists of a flow distribution body 1, a vertical shaft 2, an upper arc bent pipe 31, a lower arc bent pipe 32 and a flat tunnel 4 from top to bottom, and the total length is 72.55 m. The normal water storage level 636m, the dead water level 606m, the water inlet bottom plate elevation 598.60m and the single-machine power generation flow of the upper reservoir are 97.4m3The water pumping flow of the single machine is 82.1m3And s. The flow divider 1 comprises flow dividing partition piers and a top cover, wherein 10 flow dividing piers are arranged at each water inlet and outlet, are distributed in a fan shape on the plane, and form 10 inlet and outlet flow orifices together with the top cover, and the orifices are provided with trash racks; the lower part of the flow divider 1 is a vertical shaft 2, the vertical shaft 2 consists of a diffusion section and a straight pipe section, the length of the diffusion section is 32m, a boundary curve adopts an 1/4 elliptic curve, a large bell mouth with the diameter of 25.00m is gradually changed into a vertical shaft pipeline with the diameter of 7.8m, and the length of the straight pipe section is 3.9m and the diameter of the straight pipe section is 7.8 m; the lower part of the vertical shaft 2 is connected with the flat tunnel 4 through a bent pipe, the bent pipe consists of an upper arc bent pipe 31 and a lower arc bent pipe 32, the diameter of the bent pipe is 7.8m, the turning radius of the upper arc bent pipe 31 is 15m, the turning angle is 25 degrees, the turning radius of the lower arc bent pipe 32 is 15m, the turning angle is 115 degrees, and the total length of the axes of the two bent pipes is 36.65 m; the bottom cavern 4 is 225m long and 7.8m in diameter.
According to the model test result, after the S-shaped combined elbow pipe lower structure is applied to the well type water inlet and outlet, the flow distribution of each orifice under the water pumping working condition is more uniform, the vertical flow velocity uneven distribution coefficient of the cross section of the trash rack becomes smaller, the negative flow velocity at the bottom of the trash rack disappears, the head loss is obviously reduced, the economic benefit is high, and various hydraulic problems caused by the self body type characteristics of the well type water inlet and outlet are solved. The embodiment breaks through the existing engineering experience, has simple body type design and obvious effect, and can be widely popularized and applied in pumped storage power station engineering.
The above-mentioned embodiments are only for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to carry out the same, and the present invention shall not be limited to the embodiments, i.e. the equivalent changes or modifications made within the spirit of the present invention shall fall within the scope of the present invention.
Claims (5)
1. The utility model provides an adopt well formula inlet outlet structure of S type return bend, includes reposition of redundant personnel (1), shaft (2), return bend, flat hole (4) that from the top down connects gradually, its characterized in that, the return bend comprises upper circular arc return bend (31) and lower circular arc return bend (32), upper circular arc return bend (31) and lower circular arc return bend (32) are two sections reverse circular arc return bends, the axis of reposition of redundant personnel (1), shaft (2), upper circular arc return bend (31), lower circular arc return bend (32), flat hole (4) is on the coplanar and perpendicular to ground.
2. The well type water inlet and outlet structure using the S-bend pipe as claimed in claim 1, wherein the shaft (2) is composed of a diverging section and a straight pipe section.
3. The well type water inlet and outlet structure using the S-shaped bent pipe according to claim 2, wherein the cross section of the upper arc bent pipe (31) and the lower arc bent pipe (32) is a circular pipe with the same diameter as the straight pipe of the shaft (2) and the flat hole (4).
4. The well type water inlet and outlet structure adopting the S-shaped elbow pipe as claimed in claim 3 is characterized in that the axes of the upper arc elbow pipe (31) and the lower arc elbow pipe (32) are tangent, the upper arc elbow pipe (31) is also tangent to the axis of the shaft, and the lower arc elbow pipe (32) is also tangent to the axis of the flat tunnel (4).
5. The well type water inlet and outlet structure using the S-shaped elbow according to claim 4, wherein the upper arc elbow (31) and the lower arc elbow (32) have the same turning radius, and the turning angle of the lower arc elbow (32) is larger than that of the upper arc elbow (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110951951.7A CN113737748A (en) | 2021-08-18 | 2021-08-18 | Well type water inlet and outlet structure adopting S-shaped bent pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110951951.7A CN113737748A (en) | 2021-08-18 | 2021-08-18 | Well type water inlet and outlet structure adopting S-shaped bent pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113737748A true CN113737748A (en) | 2021-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110951951.7A Pending CN113737748A (en) | 2021-08-18 | 2021-08-18 | Well type water inlet and outlet structure adopting S-shaped bent pipe |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102144089A (en) * | 2008-09-03 | 2011-08-03 | 艾劳埃斯·乌本 | Hydropower plant |
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2021
- 2021-08-18 CN CN202110951951.7A patent/CN113737748A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102144089A (en) * | 2008-09-03 | 2011-08-03 | 艾劳埃斯·乌本 | Hydropower plant |
Non-Patent Citations (1)
| Title |
|---|
| 张晓曦等: ""抽水蓄能电站竖式进/出水口CFD 水力优化"", 《水力发电学报》 * |
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Application publication date: 20211203 |