A vortex-eliminating device at the inlet of a hydropower station unit

Abstract

This utility model relates to the field of water conservancy facilities, specifically disclosing a vortex-breaking device for the inlet of a hydropower station unit. The device includes a central pipe, an outer baffle located outside the central pipe, an inner baffle located inside the central pipe, and several auxiliary inlets on the side of the central pipe. A floating unit is located on the upper side of the central pipe. When in use, this device needs to be placed in an area prone to vortex formation. The device obtains its main buoyancy through the floating unit and only requires simple rope fixation to prevent it from drifting with the water flow. When water flows towards the turbine, the outer baffle effectively blocks the water flow rotation, suppressing vortex formation at the source. To improve water intake efficiency, several auxiliary inlets are added to the central pipe. Simultaneously, to prevent water flow rotation inside the central pipe, an inner baffle is installed on the inner side of the central pipe, referencing the vortex-breaking principle of the outer baffle.

Description

Technical Field

[0001] This utility model belongs to the field of water conservancy facilities, and specifically relates to a device for eliminating vortices at the water inlet of a hydropower station unit. Background Technology

[0002] After the water inlet of the hydropower station's generator unit is opened, the water flow velocity around the inlet is extremely high, and vortices are easily generated. The presence of vortices not only intensifies the impact on the turbine blades, but also strongly pulls in floating objects on the water surface, causing the floating objects to scrape against the turbine blades. Ultimately, this can not only cause blade damage and abnormal vibration of the generator unit, but in severe cases, it can even hinder the normal operation of the unit.

[0003] In existing technologies, such as the patent "CN204475287U - A vortex-resistant device for the intake of a hydropower station dam," an arched frame scheme is disclosed. This scheme guides wave counter-impact to offset some of the water kinetic energy, thereby limiting the maximum flow velocity and flow rate at the intake, thus protecting the turbine blades. However, in terms of practical application effects, existing technologies still have considerable room for improvement in terms of vortex-resistant vibration reduction and protection effectiveness. Utility Model Content

[0004] The purpose of this invention is to provide a device for eliminating vortices at the inlet of a hydropower station unit that allows for greater flow velocity and volume.

[0005] To achieve the above objectives, this utility model provides a vortex-breaking device for the inlet of a hydropower station unit, comprising: a central pipe, a plurality of outer baffles distributed on the outside of the central pipe, and a plurality of inner baffles distributed on the inside of the central pipe. The outer baffles and the inner baffles extend along the axial direction of the central pipe. A plurality of auxiliary inlets are provided on the side of the central pipe. A floating unit is provided on the top of the central pipe. The floating unit is used to generate buoyancy so that the central pipe, the outer baffles, and the inner baffles float in the water.

[0006] As an improvement to the above solution, vertical limiting rods are fixed to the upper side of the multiple outer baffles. The vertical limiting rods extend along the axial direction of the central tube and then bend along the radial direction of the central tube. The ends of all the vertical limiting rods converge at the top middle position of the floating unit. At least one annular limiting rod is sleeved on all the vertical limiting rods. The plurality of vertical limiting rods and the plurality of annular limiting rods form a limiting frame for locking the floating unit.

[0007] As an improvement to the above solution, the limiting frame is cylindrical, the floating unit is a cylindrical airbag, and the top of the limiting frame is provided with a lifting ring to facilitate the lifting of the vortex-breaking device by a crane.

[0008] As an improvement to the above solution, the central tube, the outer baffle, the inner baffle, the vertical limiting rod, and the annular limiting rod are all fixed by welding.

[0009] As an improvement to the above solution, the diameter of the central tube is 2-3m, the height is 1-2m, and the thickness is 5-10mm. The central tube is spliced ​​together from several arc-shaped plates, and the thickness of the outer baffle and the inner baffle is 5-8mm.

[0010] This invention offers the following advantages: When in use, the device must be placed in an area prone to vortex formation. It obtains its primary buoyancy through a floating unit and only requires simple rope fixation to prevent drifting with the water flow. When water flows towards the turbine, the outer baffle effectively blocks water rotation, suppressing vortex formation at its source. To improve water intake efficiency, several auxiliary inlets are added to the central tube. Simultaneously, to prevent water rotation inside the central tube, an inner baffle is installed on the inner side of the central tube, referencing the vortex-breaking principle of the outer baffle. In summary, this solution effectively prevents water from forming vortices, thus providing excellent protection for the turbine blades and extending the turbine's service life. Attached Figure Description

[0011] Figure 1 This is a top perspective view of the device in one embodiment;

[0012] Figure 2 This is a bottom-view perspective view of the device in one embodiment.

[0013] Explanation of reference numerals in the attached drawings: 11. Central pipe; 12. Auxiliary inlet; 21. Outer baffle; 22. Inner baffle; 31. Vertical limiting rod; 32. Circular limiting rod; 33. Floating unit; 34. Lifting ring. Detailed Implementation

[0014] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0015] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. Where the terms "first," "second," and "third" are used for descriptive purposes and to distinguish technical features, they should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0016] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0017] Reference Figure 1 and Figure 2 This utility model discloses a vortex-breaking device for the inlet of a hydropower station unit, comprising: a central pipe 11, a plurality of outer baffles 21 distributed on the outside of the central pipe 11, and a plurality of inner baffles 22 distributed on the inside of the central pipe 11. The outer baffles 21 and the inner baffles 22 extend along the axial direction of the central pipe 11. A plurality of auxiliary inlets 12 are provided on the side of the central pipe 11. A floating unit 33 is provided on the top of the central pipe 11. The floating unit 33 is used to generate buoyancy so that the central pipe 11, the outer baffles 21 and the inner baffles 22 float in the water.

[0018] As an improvement to the above solution, vertical limiting rods 31 are fixed to the upper side of multiple outer baffles 21. The vertical limiting rods 31 extend along the axial direction of the central tube 11 and then bend along the radial direction of the central tube 11. The ends of all the vertical limiting rods 31 converge at the top center of the floating unit 33. At least one annular limiting rod 32 is fitted onto each of the vertical limiting rods 31. Several vertical limiting rods 31 and several annular limiting rods 32 form a limiting frame that locks the floating unit 33. Furthermore, both the vertical limiting rods 31 and the annular limiting rods 32 are made of steel wire, i.e., their cross-sections are circular.

[0019] As an improvement to the above solution, the limiting frame is cylindrical, and the floating unit 33 is a cylindrical airbag. The top of the limiting frame is provided with a lifting ring 34 to facilitate the lifting of the vortex-breaking device by a crane. In this embodiment, the maximum volume of the area enclosed by the vertical limiting rod 31 and the annular limiting rod 32 is cylindrical. Correspondingly, after the floating unit 33 is set as a cylinder, the volume of the area enclosed by the limiting rods can be utilized to the maximum extent to provide sufficient buoyancy.

[0020] As an improvement to the above solution, the central tube 11, the outer baffle 21, the inner baffle 22, the vertical limiting rod 31, and the annular limiting rod 32 are all fixed by welding. In this embodiment, the central tube 11 is used as the main load-bearing body. When welding the outer baffle 21 to the central tube 11, the left and right sides of the bottom need to be welded. Similarly, when welding the inner baffle 22 to the central tube 11, the left and right sides of the bottom need to be welded.

[0021] As an improvement to the above scheme, the central tube 11 has a diameter of 2-3m, a height of 1-2m, and a thickness of 5-10mm. The central tube 11 is composed of several arc-shaped plates spliced ​​together. The outer baffle 21 and the inner baffle 22 have a thickness of 5-8mm. When manufactured according to the above proportions, the entire device weighs approximately 700kg, and the buoyancy provided by the floating unit 33 needs to be greater than 800kg.

[0022] When using this device, it must be placed in an area prone to vortex formation. The device obtains its main buoyancy through the floating unit 33, requiring only simple rope fixation to prevent it from drifting with the water flow. When water flows towards the turbine, the outer baffle 21 effectively blocks water rotation, suppressing vortex formation at its source. To improve water intake efficiency, several auxiliary inlets 12 are added to the central pipe 11. Simultaneously, to prevent water rotation inside the central pipe 11, an inner baffle 22 is installed on the inner side of the central pipe 11, based on the vortex-breaking principle of the outer baffle 21. In summary, this solution effectively prevents water flow from forming vortices, thus providing excellent protection for the turbine blades and extending the turbine's service life.

[0023] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A vortex-breaking device at the inlet of a hydropower station unit, characterized in that, include: The system comprises a central tube, several outer baffles distributed on the outside of the central tube, and several inner baffles distributed on the inside of the central tube. Both the outer and inner baffles extend along the axial direction of the central tube. Several auxiliary water inlets are provided on the side of the central tube. A floating unit is provided at the top of the central tube to generate buoyancy, allowing the central tube, the outer baffles, and the inner baffles to float in the water. Vertical limiting rods are fixed to the upper sides of the outer baffles, extending along the axial direction of the central tube and then along the central tube. The tube is bent radially, and the ends of all the vertical limiting rods converge at the top center of the floating unit. At least one annular limiting rod is fitted on all the vertical limiting rods. A plurality of vertical limiting rods and a plurality of annular limiting rods form a limiting frame that locks the floating unit. The limiting frame is cylindrical, and the floating unit is a cylindrical airbag. The top of the limiting frame is provided with a lifting ring to facilitate the lifting of the vortex-breaking device by a crane. The central tube, the outer baffle, the inner baffle, the vertical limiting rods, and the annular limiting rods are all fixed by welding.

2. The vortex-breaking device at the inlet of a hydropower station unit according to claim 1, characterized in that: The central tube has a diameter of 2-3m, a height of 1-2m, and a thickness of 5-10mm. The central tube is composed of several arc-shaped plates spliced ​​together. The outer baffle and the inner baffle have a thickness of 5-8mm.

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