A vertical shaft water inlet and outlet structure using equal-width gradient pipes

Abstract

The present invention discloses a shaft-type water inlet and outlet structure using equal-width gradient pipes, and belongs to the technical field of pumped-storage power station engineering. It includes a tunnel section, a bend section, a vertical section and a diffusion section connected in sequence from bottom to top. The bend section includes an upper arc bend pipe, an intermediate transition bend pipe and a lower arc bend pipe, and its axis is a non-concentric arc, and its cross section is an equal-width oblong. A diverter pier and a cover plate are arranged on the top of the diffusion section, and the axes of the cover plate, the diverter pier, the diffusion section, the vertical section and the bend section are all located in the same vertical plane. The present invention uses an equal-width gradient pipe structure, and the hydraulic indicators such as the head loss of the water inlet and outlet, the velocity distribution of each orifice and the flow distribution under the combined working conditions are at the same level as the various hydraulic indicators of the traditional elbow type, which simplifies the construction process. The present invention breaks through the existing engineering experience, has a simple structural design, and has obvious effects, and can be widely promoted and applied in pumped-storage power station projects.

Description

Technical Field

[0001] The invention relates to the technical field of pumped storage power station engineering, and in particular to a vertical shaft type water inlet and outlet structure using equal-width gradient pipes. Background Art

[0002] As an important regulating facility of the clean energy system, pumped storage power stations are entering a peak period of construction. The inlet and outlet are important components of the waterway system of pumped storage power stations. There are two main types: side-type and well-type. Compared with the side-type inlet and outlet, the vertical well type has the characteristics of lower requirements for terrain and geological conditions, flexible layout, and small excavation volume. It is gradually increasing in engineering applications, such as my country's Xilongchi, Liyang, Yimeng and other pumped storage power stations.

[0003] At present, the shaft-type water inlet and outlet are often set up in the upper reservoir, connecting the horizontal water transfer tunnel vertically with the bottom of the reservoir area. The water flow passes through two 90° turns in a short distance, and the hydraulic characteristics are complex. At the same time, the shaft-type water inlet and outlet have bidirectional flow characteristics, and the inflow and outflow conditions are frequently changed, which puts higher requirements on its hydraulic design. The design specification of pumped storage power station clearly stipulates that the water flow should be evenly diffused when the inlet and outlet flow outflows. The bend section is the key shape to control whether the outflow of the shaft-type water inlet and outlet is uniform. If the design is improper, problems such as biased flow are prone to occur, which is not conducive to the operation of the project. At present, the elbow-type bend section is maturely used in the project. Although it runs well, it has the problem of complex construction technology and difficulty. The S-type bend section proposed in recent years is in the research stage and has not been implemented yet, and it has high requirements for construction details. Therefore, it is urgent to find a shaft-type water inlet and outlet structure with simple construction technology. Summary of the invention

[0004] The purpose of the present invention is to provide a vertical shaft type water inlet and outlet structure using equal width gradient pipes, which solves the problems of complex construction process and high detail requirements of the curved section of the traditional vertical shaft type water inlet and outlet structure.

[0005] To achieve the above-mentioned purpose, the present invention provides a vertical shaft type water inlet and outlet structure using equal-width gradient pipes, including a tunnel section, a curve section, a vertical section and a diffusion section connected in sequence from bottom to top, a plurality of diversion piers are arranged on the top of the diffusion section, a cover plate is arranged above the diversion piers, and the axes of the cover plate, the diversion piers, the diffusion section, the vertical section and the curve section are all located in the same vertical plane.

[0006] Preferably, the curved section comprises an upper circular arc bend, an intermediate transition bend and a lower circular arc bend, and the axes of the upper circular arc bend, the intermediate transition bend and the lower circular arc bend are three non-concentric circular arcs respectively.

[0007] Preferably, the cross section of the curved section is an oblong with equal width, and the upper arc curved pipe and the lower arc curved pipe are both semicircular structures with equal diameter.

[0008] Preferably, the diameter of the upper arc curved pipe is the same as the diameter of the tunnel body section, and the diameter of the lower arc curved pipe is the same as the diameter of the vertical section.

[0009] Preferably, the axes of the upper arc bend pipe, the middle transition bend pipe and the lower arc bend pipe are all tangent to the axis of the vertical section.

[0010] Preferably, the turning radius of the upper arc bend is greater than the turning radius of the middle transition bend, and the turning radius of the middle transition bend is greater than the turning radius of the lower arc bend.

[0011] Preferably, the turning angle of the upper arc bend is not greater than the turning angle of the intermediate transition bend, and the turning angle of the intermediate transition bend is not greater than the turning angle of the lower arc bend.

[0012] Preferably, the vertical section is a vertical straight rectifier pipe, which is used to adjust the flow state of water flowing out of the bend section during outflow;

[0013] The diffusion section gradually diffuses from the vertical section pipe into a bell-mouth structure in a gentle curve and is connected to the bottom plates of the water inlet and outlet.

[0014] Preferably, the planar shape of the cover plate is a regular polygon structure inscribed in a circle, has a certain thickness, and is connected to the diversion pier.

[0015] Preferably, a plurality of the diversion piers are evenly distributed in a circle around the top end of the diffusion section, and are used to divide the inlet and outlet water outlets into a plurality of orifice flow channels.

[0016] Therefore, the present invention adopts a vertical shaft type water inlet and outlet structure using a constant width gradient pipe of the above structure, which has the following beneficial effects:

[0017] The present invention changes the bend section of the shaft-type water inlet and outlet into an equal-width gradient pipe on the basis of the elbow type, thereby simplifying the construction process, and the various hydraulic indicators under the combined working conditions are at the same level as those of the traditional elbow type. Compared with the traditional body type, the body type of the present invention has a simpler construction process on the basis of ensuring hydraulic conditions, and is worthy of wide promotion and application in pumped storage power stations.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic elevational structural diagram of a vertical shaft type water inlet and outlet structure using a uniform width gradient pipe according to the present invention;

[0020] Figure 2It is a schematic diagram of the planar structure of a vertical shaft type water inlet and outlet structure using a uniform width gradient pipe according to the present invention;

[0021] Figure 3 The present invention is a schematic diagram of the cross-sectional structure of a curved section of a vertical shaft type water inlet and outlet structure using a constant width gradient pipe.

[0022] Reference numerals

[0023] 1. Tunnel section, 2. Curve section, 3. Vertical section, 4. Diffuser section, 5. Diverter pier, 6. Cover plate, 21. Upper arc bend, 22. Middle transition bend, 23. Lower arc bend. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0025] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] Example

[0027] like Figure 1-3 As shown, the present invention provides a vertical shaft type water inlet and outlet structure using equal-width gradient pipes, including a tunnel section 1, a bend section 2, a vertical section 3 and a diffuser section 4 connected in sequence from bottom to top, a plurality of diversion piers 5 are arranged on the top of the diffuser section 4, a cover plate 6 is arranged above the diversion piers 5, and the axes of the cover plate 6, the diversion piers 5, the diffuser section 6, the vertical section 3 and the bend section 2 are all located in the same vertical plane.

[0028] The curved section 2 comprises an upper arc curved pipe 21, an intermediate transition curved pipe 22 and a lower arc curved pipe 23, and the axes of the upper arc curved pipe 21, the intermediate transition curved pipe 22 and the lower arc curved pipe 23 are three non-concentric arcs respectively.

[0029] The cross section of the curved section 2 is an oblong with equal width, and the upper arc curved pipe 21 and the lower arc curved pipe 23 are both semicircular structures with equal diameter.

[0030] The diameter of the upper arc curved pipe 21 is the same as the diameter of the tunnel body section 1 , and the diameter of the lower arc curved pipe 23 is the same as the diameter of the vertical section 3 .

[0031] The axes of the upper arc bend pipe 21 , the middle transition bend pipe 22 and the lower arc bend pipe 23 are all tangent to the axis of the vertical section 3 .

[0032] The turning radius of the upper arc bend pipe 21 is greater than the turning radius of the middle transition bend pipe 22 , and the turning radius of the middle transition bend pipe 22 is greater than the turning radius of the lower arc bend pipe 23 .

[0033] The turning angle of the upper arc elbow 21 is not greater than the turning angle of the middle transition elbow 22 , and the turning angle of the middle transition elbow 22 is not greater than the turning angle of the lower arc elbow 23 .

[0034] The vertical section 3 is a vertical straight rectifier pipe, which is used to adjust the flow pattern of the water flowing out of the bend section during outflow;

[0035] The diffusion section 4 gradually diffuses from the vertical section of the pipeline into a bell-mouth structure in a gentle curve and is connected to the bottom plates of the inlet and outlet.

[0036] The planar shape of the cover plate 6 is a regular polygon structure inscribed in a circle, has a certain thickness, and is connected to the diversion pier 5 .

[0037] A plurality of flow dividing piers 5 are evenly distributed in a circle around the top of the diffusion section 4, and are used to divide the inlet and outlet water outlets into a plurality of orifice flow channels.

[0038] Working principle: For the upper reservoir, the water inlet and outlet are in the outflow state during the pumping condition. The water flows from the tunnel section 1 through the bend section 2 into the vertical section 3. Due to the change in flow direction, the flow velocity in the shaft is unevenly distributed, resulting in uneven flow distribution in the orifice flow channels at the diversion pier 5. The equal-width gradient pipe is used to connect the tunnel section 1 and the vertical section 3. Under the combined working condition, its various hydraulic indicators are at the same level as the traditional elbow type, but in terms of structure, the equal-width gradient pipe does not diffuse in the horizontal direction, which simplifies the construction process.

[0039] The following is a further description of a large-scale pumped storage power station project using the technical solution of the present invention as an example with reference to the accompanying drawings:

[0040] In a large-scale pumped-storage power station project, the upper reservoir adopts a shaft-type water inlet and outlet, which is located on the south side of the reservoir basin. There are two water inlets and outlets in the upper reservoir, which are of the same shape and arranged in parallel. In order to simplify the construction process, the water inlet and outlet structure of the present invention is applied. From bottom to top, it consists of a tunnel section 1, an upper arc bend 21, an intermediate transition bend 22, a lower arc bend 23, a vertical section 3, a diffusion section 4, a diversion pier 5 and a cover plate 6, with a total length of 72.55m. The normal water level of the upper reservoir is 1268m, the dead water level is 1245m, the elevation of the water inlet bottom plate is 1234.50m, and the single-unit power generation flow is 59.57m 3 / s, the single-machine pumping flow is 52.86m 3 / s. The tunnel section is 250m long and 6.4m in diameter; the tunnel section 1 is connected to the vertical section 3 through the curved section 2, which is composed of an upper arc curved pipe 21, an intermediate transition curved pipe 22 and a lower arc curved pipe 23, with height differences of 3.62m and 3.98m respectively. The upper arc curved pipe 21 has a turning radius of 21m and a turning angle of 85.5°, the intermediate transition curved pipe 22 has a turning radius of 18m and a turning angle of 90°, and the lower arc curved pipe 23 has a turning radius of 15m and a turning angle of 85.5°. The turning angle is 94.5°; the vertical section 3 is 18m long and 6.4m in diameter; the diffusion section 4 is 27.15m long, and the boundary curve adopts a 1 / 4 elliptical curve, which diffuses the vertical pipe with a diameter of 6.4m into a trumpet with a diameter of 17.26m, and is connected to the inlet / outlet bottom plate; the diffusion section 4 is connected to the diversion pier 5, and there are 8 diversion piers at each inlet and outlet, which are distributed in a fan shape on the plane, and together with the cover plate 6, 8 inlet and outlet flow orifices are formed, and trash racks are provided at the orifices.

[0041] Therefore, the present invention adopts the above-mentioned vertical shaft type water inlet and outlet structure using equal width gradient tubes, and applies the equal width gradient tube structure. The hydraulic indicators such as water head loss of the water inlet and outlet under the pumping condition (outflow), the velocity distribution of each orifice and the flow distribution are at the same level as the hydraulic indicators of the traditional elbow type, simplifying the construction process. The present invention breaks through the existing engineering experience, has a simple body design, and has obvious effects. It can be widely promoted and applied in pumped storage power station projects.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A vertical shaft water inlet and outlet structure using a uniform width gradient pipe, characterized in that: It comprises a tunnel section, a curved section, a vertical section and a diffuser section which are sequentially connected from bottom to top, a plurality of diversion piers are arranged on the top of the diffuser section, a cover plate is arranged above the diversion piers, and the axes of the cover plate, the diversion piers, the diffuser section, the vertical section and the curved section are all located in the same vertical plane; The curved section includes an upper arc curved pipe, an intermediate transition curved pipe and a lower arc curved pipe, and the axes of the upper arc curved pipe, the intermediate transition curved pipe and the lower arc curved pipe are three non-concentric arcs respectively; The cross section of the curved section is an oblong with equal width, and the upper arc curved pipe and the lower arc curved pipe are both semicircular structures with equal diameter; The diameter of the upper arc curved pipe is the same as the diameter of the tunnel body section, and the diameter of the lower arc curved pipe is the same as the diameter of the vertical section; The axes of the upper arc bend pipe, the intermediate transition bend pipe and the lower arc bend pipe are all tangent to the axis of the vertical section; The vertical section is a vertical straight rectifier pipe, which is used to adjust the flow pattern of water flowing out of the bend section during outflow; The diffusion section gradually diffuses from the vertical section pipe into a bell-mouth structure in a gentle curve; The planar shape of the cover plate is a regular polygon structure inscribed in a circle; A plurality of the diversion piers are evenly distributed in a circle around the top of the diffusion section.

2. A vertical shaft type water inlet and outlet structure using a uniform width gradient pipe according to claim 1, characterized in that: The turning radius of the upper arc bend is greater than the turning radius of the intermediate transition bend, and the turning radius of the intermediate transition bend is greater than the turning radius of the lower arc bend.

3. The vertical shaft type water inlet and outlet structure using a uniform width gradient pipe according to claim 2, characterized in that: The turning angle of the upper arc bend is not greater than the turning angle of the intermediate transition bend, and the turning angle of the intermediate transition bend is not greater than the turning angle of the lower arc bend.

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