A type of movable guide vane for a water turbine

Abstract

This utility model relates to the field of turbine guide vane technology, and discloses a movable guide vane for a turbine, including a guide vane and a guide vane shaft. The upper and lower end faces of the guide vane are wavy curved surfaces. The key feature is that a vibration-damping mesh structure is provided inside the guide vane. The vibration-damping mesh structure includes transverse meshes parallel to the upper and lower end faces, and also includes multiple longitudinal meshes intersecting the transverse meshes. This ensures that the guide vane maintains a stable overall shape and size under various operating conditions, alters the vibration wave propagation path, absorbs and dissipates vibration energy, and reduces the vibration amplitude of the guide vane. Therefore, it can effectively enhance the overall strength of the guide vane and prevent damage caused by excessive local stress.

Description

Technical Field

[0001] This utility model relates to the field of water turbine guide vane technology, specifically to a movable guide vane for a water turbine. Background Technology

[0002] As a key component of the water turbine, the movable guide vanes are a series of airfoil-shaped blades arranged around the turbine runner with adjustable angles. They are linked by mechanisms such as control rings and connecting rods, and can open and close synchronously like apertures, thereby precisely controlling the flow rate, direction, and speed of the water entering the runner to ensure the efficient and stable operation of the water turbine.

[0003] Chinese patent document CN118208357A discloses a movable guide vane structure and a variable speed pumped storage unit adapted to wide frequency operation, including a movable guide vane body; a rotating shaft connected to the movable guide vane body; and multiple grooves, wherein two end faces of the movable guide vane body along the axial direction of the rotating shaft are flow guiding end faces, and the multiple grooves are formed on the flow guiding end faces of the movable guide vane body.

[0004] Under the impact of complex water flow, existing movable guide vanes are prone to vibration, leading to cavitation and wear, reducing guide vane life and turbine efficiency, and threatening the safe operation of the unit. Therefore, improving the structure of movable guide vanes to enhance their performance has become an urgent need in the development of turbine technology. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a movable guide vane for a water turbine, including a guide vane and a guide vane shaft. The upper and lower end faces of the guide vane are wavy curved surfaces. The guide vane is characterized by having a shock-absorbing mesh structure inside.

[0006] Preferably, the damping mesh structure includes a transverse mesh, which is parallel to the upper and lower end faces.

[0007] To further improve the vibration reduction effect, the vibration reduction grid structure also includes multiple longitudinal grids, which intersect the transverse grids respectively.

[0008] Preferably, the ends of the horizontal and vertical grids are generally linear wavy surfaces.

[0009] Preferably, the ends of the transverse and longitudinal grids are close to the upper and lower end faces.

[0010] To facilitate further vibration absorption, both the transverse and longitudinal grids are tubular structures, and the transverse and longitudinal grids are connected at their junctions.

[0011] Preferably, the damping mesh structure is a square mesh.

[0012] To avoid the ends of the damping mesh structure affecting the streamlined structure of the guide vane, the ends of the transverse and longitudinal meshes are 5-10 mm away from the upper and lower end faces. This distance ensures that the guide vane contour will not be recessed or protruded during casting.

[0013] This utility model has the following beneficial effects: Overall Structure: The main damping grid structure of the turbine's movable guide vane is tightly integrated with a pipe network reinforcement layer. This provides basic structural support, ensuring the guide vane maintains a stable overall shape and size under various operating conditions. Several sets of damping pipe networks are pre-embedded inside the guide vane, integrally formed with the guide vane body. The distributed titanium alloy tubular structure can evenly distribute force like a tight net. When the guide vane vibrates under water flow excitation, it can evenly transmit force to the entire guide vane, changing the vibration wave propagation path, absorbing and dissipating vibration energy, and reducing the vibration amplitude. Therefore, it can effectively enhance the overall strength of the guide vane and prevent damage caused by excessive local stress. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an embodiment of the movable guide vane of the water turbine of this utility model; Figure 2 This is a cross-sectional view of the guide vane. Detailed Implementation

[0015] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: guide vane 1, guide vane shaft 2, upper end face 3, lower end face 4, transverse grid 5, longitudinal grid 6, and grid point 7.

[0016] Example 1 like Figure 1 and 2 As shown, a movable guide vane for a water turbine includes a guide vane 1 and a guide vane shaft 2. The upper end face 3 and the lower end face 4 of the guide vane 1 are wavy curved surfaces. A vibration damping mesh structure is provided inside the guide vane 1. The vibration damping mesh structure includes a transverse mesh 5, which is parallel to the upper end face 3 and the lower end face 4. The vibration damping mesh structure also includes multiple longitudinal meshes 6, which are evenly distributed at each mesh point 7 of the transverse mesh 5.

[0017] The ends of the horizontal grid 5 and the vertical grid 6 are generally linear wavy surfaces.

[0018] The ends of the horizontal grid 5 and the vertical grid 6 are close to the upper end face 3 and the lower end face 4.

[0019] Both the horizontal grid 5 and the vertical grid 6 are tubular structures made of titanium alloy, and the horizontal grid 5 and the vertical grid 6 are connected at the junction.

[0020] The damping mesh structure is a square mesh.

[0021] The distance between the ends of the transverse grid 5 and the longitudinal grid 6 and the upper end face 3 and the lower end face 4 is 10mm. This distance ensures that the guide vane 1 will not be recessed or protruded during casting.

[0022] During the manufacturing process of the guide vane 1, the shock-absorbing mesh structure is placed in a casting mold, and molten guide vane 1 casting material is poured into the mold to encapsulate the shock-absorbing mesh structure, thereby completing the manufacturing of the guide vane 1.

[0023] This invention significantly improves the overall performance of the guide vane 1 by integrating a dedicated shock-absorbing mesh structure within it. This mesh structure and the guide vane 1 body are integrally cast, forming a robust composite that ensures the guide vane 1 maintains extremely high structural integrity and dimensional stability even under complex and variable water flow loads.

[0024] Its core advantage lies in the efficient management and suppression of vibration by this mesh structure. When the guide vane 1 vibrates due to the impact of water flow, the internal mesh frame can effectively redistribute and disperse stress, interfering with the transmission path of vibration waves. At the same time, this structure actively absorbs and dissipates vibration energy through internal material friction and micro-deformation, thereby significantly reducing the overall vibration amplitude of the guide vane 1.

[0025] Ultimately, this design fundamentally enhances the fatigue strength and dynamic reliability of guide vane 1, effectively avoids damage such as cracks and cavitation caused by stress concentration or resonance, extends the service life of guide vane 1, and ensures the safe, stable, and efficient operation of the turbine unit.

[0026] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A movable guide vane for a water turbine, comprising a guide vane and a guide vane shaft, wherein the upper and lower end faces of the guide vane are wavy curved surfaces, characterized in that, The guide vane is equipped with a shock-absorbing mesh structure.

2. The movable guide vane of the water turbine according to claim 1, characterized in that: The damping mesh structure includes a transverse mesh, which is parallel to the upper and lower surfaces.

3. The movable guide vane of the water turbine according to claim 2, characterized in that: The damping grid structure also includes multiple longitudinal grids, which intersect the transverse grids respectively.

4. The movable guide vane of the water turbine according to claim 3, characterized in that: The ends of the horizontal and vertical grids are generally linear wavy surfaces.

5. The movable guide vane of the water turbine according to claim 4, characterized in that: The ends of the horizontal and vertical grids are close to the upper and lower end faces.

6. The movable guide vane of the water turbine according to claim 5, characterized in that: Both the horizontal and vertical grids are tubular structures, and the horizontal and vertical grids are connected at their junctions.

7. The movable guide vane of the water turbine according to claim 6, characterized in that: The damping mesh structure is a square mesh.

8. The movable guide vane of the water turbine according to claim 7, characterized in that: The ends of the horizontal and vertical grids are 5-10 mm away from the upper and lower ends, respectively.

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