Folded plate rotational flow vertical shaft

Abstract

The invention belongs to the technical field of water conservancy and hydropower engineering, and particularly discloses a folded plate rotational flow vertical shaft which comprises a ventilation column and a plurality of folded plate rotational flow blades. The ventilation column is arranged in the center of the shaft; the multiple folded plate swirl vanes are arranged in the circumferential direction of the ventilation column, and each folded plate swirl vane comprises a flow passing plate and a flow guide plate; one end of the overflowing plate is fixedly connected with the ventilation column, the other end of the overflowing plate is fixedly connected with the shaft wall of the vertical shaft, and the overflowing plate is horizontally arranged; one end of the guide plate is fixedly connected with the ventilation column, the other end of the guide plate is fixedly connected with the shaft wall of the vertical shaft, the side edge of the guide plate is connected with the side edge of the overflowing plate, and the plate face of the guide plate inclines downwards from the overflowing plate side. According to the vertical shaft, the ventilation column and the multiple folded plate swirl vanes are used for swirling, and compared with swirling of the swirling piers, the drainage length and the drainage flow can be increased; and compared with vortex chamber rotation starting, the complex body type without the vortex chamber can obviously reduce the risk of underground engineering excavation.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy and hydropower engineering technology, and specifically discloses a folded plate vortex vertical shaft. Background Technology

[0002] The most commonly used vortex initiation methods in existing vertical shaft spillway tunnels are mainly two types: horizontal single-sided inlet vortex initiation (vortex chamber initiation) and submerged vortex initiation piers deployed outside the annular weir (vortex pier initiation). Among these, due to the relatively small flow coefficient of the annular weir, vortex pier initiation is generally suitable for small-flow discharges, such as the new type of vortex annular weir vertical shaft spillway tunnel at the Qingyuan pumped storage power station in Guangdong, with a maximum discharge of 534.2 m³. 3 / s; the vortex initiation flow rate can reach 1500m³ / s. 3 / s, but the vortex structure is complex and is an underground structure, so the excavation and construction risks are relatively high. Summary of the Invention

[0003] The purpose of this invention is to provide a folded plate vortex shaft to solve the technical problems of small discharge flow rate of existing vortex initiation piers and complex structure and high excavation construction risk of vortex initiation piers.

[0004] This invention provides a folded vortex vertical shaft, comprising a ventilation column and multiple folded vortex blades; The ventilation column is located at the center of the vertical shaft; The plurality of folded swirl blades are arranged circumferentially along the ventilation column, and each folded swirl blade includes a flow plate and a guide plate; One end of the flow plate is fixedly connected to the ventilation column, and the other end is fixedly connected to the wall of the vertical shaft, and the flow plate is horizontally arranged; One end of the guide plate is fixedly connected to the ventilation column, and the other end is fixedly connected to the well wall of the vertical shaft. The side of the guide plate is connected to the side of the flow plate, and the surface of the guide plate is inclined downward from the side of the flow plate.

[0005] Preferably, the width of the section where the guide plate meets the ventilation column is smaller than the width of the section where the guide plate meets the well wall.

[0006] Preferably, the elevation at the junction of the guide plate and the ventilation column is greater than the elevation at the junction of the guide plate and the well wall.

[0007] Preferably, the width of the junction between the flow plate and the vent column is smaller than the width of the junction between the flow plate and the well wall.

[0008] Preferably, the angle between the surface of the guide plate and the surface of the flow plate is 100° to 160°.

[0009] Preferably, the number of the folding swirl blades is 4 to 12.

[0010] The folded plate vortex vertical shaft of the present invention has the following advantages compared with the prior art: The well body of the folded plate vortex vertical shaft of the present invention is a cylindrical structure. It starts to swirl with the help of a ventilation column and multiple folded plate vortex blades, without the need for a bell-shaped body to stabilize the vortex. The structure is simple and easy to construct.

[0011] The folded plate vortex shaft of the present invention, compared with the vortex initiation pier, can increase the discharge length and discharge flow rate; compared with the vortex initiation, the complex shape without vortex chamber can significantly reduce the risk of underground engineering excavation.

[0012] The folded plate vortex shaft of the present invention simplifies the main control parameters for vortex initiation. The complex streamline parameters and rotation angle of the vortex initiation pier are simplified to the folded plate angle. The single parameter makes it easier to conduct test control and design, and also helps to improve construction quality. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the folded plate vortex vertical shaft according to an embodiment of the present invention.

[0014] Figure 2 This is a three-dimensional view of the folded plate vortex vertical shaft according to an embodiment of the present invention.

[0015] Figure 3 This is a three-dimensional view of the folded plate vortex vertical shaft after the well wall has been removed, according to an embodiment of the present invention.

[0016] In the diagram: 1. Ventilation column; 2. Baffle swirl vane; 3. Flow plate; 4. Guide plate; 5. Well wall. Detailed Implementation

[0017] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0018] This invention provides a method such as Figures 1 to 3 The illustrated vortex shaft includes a ventilation column 1 and multiple vortex blades 2; wherein the ventilation column 1 is located at the center of the shaft; and the multiple vortex blades 2 are arranged radially along the circumference of the ventilation column 1.

[0019] Each swirl vane 2 includes a flow plate 3 and a guide plate 4; one end of the flow plate 3 is fixedly connected to the ventilation column 1, and the other end is fixedly connected to the well wall 5 of the vertical shaft, and the flow plate 3 is horizontally arranged; one end of the guide plate 4 is fixedly connected to the ventilation column 1, and the other end is fixedly connected to the well wall 5 of the vertical shaft, the side of the guide plate 4 is connected to the side of the flow plate 3, and the plate surface of the guide plate 4 is inclined downward from the side of the flow plate 3.

[0020] In this embodiment of the invention, the lining structure on the well wall 5 supports the folded swirl blade 2 and the ventilation column 1, so that the folded swirl blade 2 and the ventilation column 1 are fixedly installed at the wellhead position of the vertical shaft.

[0021] The folding swirl blade 2 of this embodiment of the invention can guide the horizontal water flow to the outermost well wall 5, causing the water flow to move in a circle along the well wall 5, thereby initiating swirl. The swirl initiation process is as follows: Figure 1 As shown; meanwhile, the folding swirl vane 2 of this embodiment includes a flow plate 3 and a guide plate 4, so that the water flow can not only enter the vertical shaft along the well wall 5, but also along the side of the flow plate 3 away from the guide plate 4 and the side of the guide plate 4 away from the flow plate 3. This undoubtedly increases the flow width and greatly improves the flow capacity. In other words, the flow rate can be adjusted by increasing or decreasing the number of folding swirl vanes 2. In this embodiment, the number of folding swirl vanes 2 is 4 to 12. Within this range, it can avoid the problems of too few folding swirl vanes 2 causing excessive water flow impact force and too many folding swirl vanes 2 causing the water flow to become "turbulent" and reduce energy dissipation efficiency. At the same time, within this range, the number of folding swirl vanes 2 can also ensure the flow capacity while dissipating energy, avoiding the problem of too many folding swirl vanes 2 causing small flow.

[0022] To prevent the formation of negative pressure zones in the high-speed water flow rotating within the shaft, which could lead to the formation of air bubbles (cavitation) and subsequent impact and damage (cavitation erosion) on the shaft wall 5 caused by bubble bursting, this embodiment of the invention includes an air supply column 1 at the center of the shaft. The air supply column 1 replenishes air to the negative pressure zone, reducing the negative pressure and effectively preventing cavitation erosion. Simultaneously, air replenishment also optimizes the hydraulic characteristics of the water flow and improves energy dissipation efficiency.

[0023] In this embodiment of the invention, the width of the section where the guide plate 4 connects to the air column 1 is smaller than the width of the section where the guide plate 4 connects to the well wall 5, and the elevation of the section where the guide plate 4 connects to the air column 1 is greater than the elevation of the section where the guide plate 4 connects to the well wall 5. This arrangement allows the water flow to better reach the well wall 5 with the help of gravity and the gradually widening guide plate 4, thereby significantly improving the swirling effect.

[0024] To improve energy dissipation efficiency while increasing flow rate, in this embodiment of the invention, the width of the connection between the flow plate 3 and the air column 1 is smaller than the width of the connection between the flow plate 3 and the well wall 5. In this case, the large flow rate of water near the air column 1 can have a higher air concentration, thereby improving energy dissipation efficiency.

[0025] In this embodiment of the invention, the angle between the surface of the guide plate 4 and the surface of the flow plate 3 is 100° to 160°. Within this angle range, the swirling effect can be optimized.

[0026] The shaft of the folded plate vortex vertical shaft in this embodiment of the invention has a cylindrical structure. It starts to swirl with the help of the ventilation column 1 and multiple folded plate vortex blades 2, without the need for a bell-shaped body to stabilize the vortex. The structure is simple and easy to construct.

[0027] The folded plate vortex shaft of this invention, compared to the vortex initiation pier, can increase the discharge length and discharge flow rate, with a discharge flow rate reaching 1500 m³ / h. 3 / s; Compared to vortex-induced rotation, the complex shape without vortex chambers can significantly reduce the risk of underground engineering excavation.

[0028] The folded plate vortex shaft of the present invention simplifies the main control parameters for vortex initiation. The complex streamline parameters and rotation angle of the vortex initiation pier are simplified to the folded plate angle. The single parameter makes it easier to conduct test control and design, and also helps to improve construction quality.

[0029] The above descriptions are merely a few embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any modifications or alterations made by those skilled in the art without departing from the scope of the technical solution of the present invention using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A folding plate vortex vertical shaft, characterized in that, Includes a ventilation column and multiple baffle swirl vanes; The ventilation column is located at the center of the vertical shaft; The plurality of folded swirl blades are arranged circumferentially along the ventilation column, and each folded swirl blade includes a flow plate and a guide plate; One end of the flow plate is fixedly connected to the ventilation column, and the other end is fixedly connected to the wall of the vertical shaft, and the flow plate is horizontally arranged; One end of the guide plate is fixedly connected to the ventilation column, and the other end is fixedly connected to the well wall of the vertical shaft. The side of the guide plate is connected to the side of the flow plate, and the surface of the guide plate is inclined downward from the side of the flow plate.

2. The folding plate vortex vertical shaft according to claim 1, characterized in that, The width at the junction of the guide plate and the ventilation column is smaller than the width at the junction of the guide plate and the well wall.

3. The folding plate vortex vertical shaft according to claim 2, characterized in that, The elevation at the junction of the guide plate and the ventilation column is greater than the elevation at the junction of the guide plate and the well wall.

4. The folding plate vortex vertical shaft according to claim 1, characterized in that, The width of the junction between the flow plate and the ventilation column is smaller than the width of the junction between the flow plate and the well wall.

5. The folding plate vortex vertical shaft according to claim 1, characterized in that, The angle between the surface of the guide plate and the surface of the flow plate is 100° to 160°.

6. The folding plate vortex vertical shaft according to claim 1, characterized in that, The number of the folding plate swirl blades is 4 to 12.

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