Adjustable water turbine guide vane thrust device
By designing the transmission mechanism and worm gear and worm gear to prevent reversal on the turbine guide vane, the problem of damage caused by rotating the guide vane when the water flow is impacted is solved, and the stability and pressure bearing capacity of the guide vane are improved.
Patent Information
- Application Number
- CN202421940937.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-08-12
AI Technical Summary
When adjusting the direction and size of the water flow, existing turbine guide vanes are easily impacted by the water flow, causing the torque to rotate, which in turn causes the control ring and large earrings to increase shear force and are easily damaged.
An adjustable turbine guide vane thrust device is designed. By setting a transmission mechanism on the movable guide vane, the worm gear and worm gear prevent reversal is used to prevent the movable guide vane from rotating when impacted by water flow, and the turntable is controlled by the power unit to adjust the inclination angle of the movable guide vane.
It effectively avoids the rotation of the movable guide vane when the water flow impacts, improves the stability of the guide vane, and increases the pressure bearing capacity of the thrust device by increasing the stress area, avoiding damage caused by long-term pressure.
Smart Images
Figure CN222962976U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of water turbines, in particular to an adjustable thrust device for water turbine guide vanes. Background Technique
[0002] As the water of the main Francis turbines and Kaplan turbines enters the runner working area radially, it has been introduced in detail in the water intake of the water turbine. The water flow enters the runner through the stay vanes of the stay ring in the spiral case. The stay vanes have a certain guiding effect on the water flow, but the stay vanes are mainly used as the struts of the stay ring and cannot control the size and direction of the water flow. Therefore, movable guide vanes are also provided to guide the size and direction of the water flow.
[0003] In the prior art, the movable guide vanes rotate synchronously and are driven by a servomotor. Generally, a transmission mechanism is composed of two servomotors and a control ring. The servomotor is fixed on the water turbine foundation, and the control ring can rotate around the main axis of the water turbine. The servomotor is a hydraulic servo mechanism, mainly composed of a cylinder block, a piston, and a piston rod. One end of the servomotor connecting rod is connected to the piston rod, and the other end is connected to the large earring on the control ring. The two servomotors act in opposite directions, and under the hydraulic action, the piston rod of the servomotor can drive the control ring to rotate forward and backward.
[0004] When the movable guide vanes adjust the direction and size of the water flow, the movable guide vanes will also bear the impact of the water flow, and the impact force of the water flow will change the direction of the movable guide vanes. Therefore, a torsion force will be applied to the movable guide vanes to make them rotate, which will cause the movable guide vanes to push the control ring to rotate. Since the control ring is connected to the servomotor through the large earring, the shear force received at the large earring will increase, easily causing damage to the large earring. Content of the Utility Model
[0005] According to the deficiencies of the prior art, the purpose of the utility model is to provide an adjustable thrust device for water turbine guide vanes to solve the technical problems mentioned in the above background technique.
[0006] The above technical purpose of the utility model is achieved through the following technical solutions:
[0007] An adjustable thrust device for water turbine guide vanes includes movable guide vanes. Baffles are arranged at the top and bottom of the movable guide vanes. A shaft hole for positioning the movable guide vanes is opened on the side wall of the baffle. The shaft hole is connected to the movable guide vanes through a rotating shaft, and the rotating shaft at the top of the movable guide vanes extends out of the baffle and is connected to a transmission mechanism.
[0008] By adopting the above technical solutions, the transmission mechanism can be driven to rotate the movable guide vanes, and the transmission mechanism has a larger contact surface, so a larger force-bearing area can be obtained, effectively improving the pressure-bearing capacity of the thrust device.
[0009] In a preferred embodiment, the present utility model can be further configured as follows: The transmission mechanism includes a top cover, a turntable, a connecting rod, a guide vane crank arm, and a power unit. A top cover is provided above the movable guide vane. The bottom of the top cover is fixedly connected to the baffle through a support column. The bottom of the top cover is connected to a turntable through a power unit. The bottom of the guide vane crank arm is fixedly connected to the movable guide vane. The guide vane crank arm and the turntable are connected through a connecting rod.
[0010] By adopting the above technical solution, the turntable can be controlled to rotate through the power unit, so that the turntable drives the movable guide vane to rotate synchronously, adjusts the inclination angle of the movable guide vane, and changes the magnitude and direction of the water flow.
[0011] In a preferred embodiment, the present utility model can be further configured as follows: A plurality of groups of movable guide vanes are provided and are uniformly arranged in the circumferential direction of the baffle.
[0012] By adopting the above technical solution, the water flow can uniformly contact the runner of the water turbine, so that the water turbine is evenly stressed and the wear is reduced.
[0013] In a preferred embodiment, the present utility model can be further configured as follows: The guide vane crank arm and the connecting rod are provided in the same number as the movable guide vane and are uniformly arranged in the circumferential direction of the turntable.
[0014] By adopting the above technical solution, when the turntable rotates, all the movable guide vanes can be driven to rotate synchronously, and the inclination angles of all the movable guide vanes can be adjusted synchronously.
[0015] In a preferred embodiment, the present utility model can be further configured as follows: The power unit includes a worm gear, a worm, and a motor. A motor is fixedly connected to the outer side wall of the top cover. The output shaft of the motor extends into the top cover and is connected to a worm through a transmission. A worm gear is engaged with one side of the worm.
[0016] By adopting the above technical solution, the characteristic of preventing reverse rotation between the worm gear and the worm can effectively prevent the movable guide vane from changing its inclination angle under the push of the water flow, making the use of the movable guide vane more stable. And the worm gear and worm drive has a large contact area, which can increase the force-bearing area of the thrust device, thereby enhancing the compressive strength of the thrust device.
[0017] In a preferred embodiment, the present utility model can be further configured as follows: A connecting block is formed by a protrusion at the bottom of the worm gear. The bottom of the connecting block is fixedly connected to the turntable.
[0018] By adopting the above technical solution, the connecting block provided can drive the turntable to rotate when the worm gear rotates, thereby controlling the rotation of the movable guide vane.
[0019] In summary, the present utility model includes at least one of the following beneficial technical effects:
[0020] For the adjustable thrust bearing device of the water turbine guide vane, through the provided transmission mechanism, by utilizing the characteristic of the worm and worm gear to prevent reverse rotation, it can effectively avoid the rotation of the movable guide vane when it is impacted by water flow, making the use of the movable guide vane more stable. Moreover, when the worm and worm gear are engaged, they have a relatively large force-bearing area, which can effectively improve the pressure-bearing capacity of the thrust bearing device and avoid damage to the thrust bearing device due to long-term pressure. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0022] Figure 1 It is a schematic structural diagram of an adjustable thrust bearing device of the water turbine guide vane of the present utility model.
[0023] Figure 2 It is a schematic internal structural diagram of an adjustable thrust bearing device of the water turbine guide vane of the present utility model.
[0024] Figure 3 It is a schematic structural diagram of the transmission mechanism in an adjustable thrust bearing device of the water turbine guide vane of the present utility model.
[0025] In the figure, 1, movable guide vane; 2, baffle; 3, shaft hole; 4, transmission mechanism; 41, top cover; 42, turntable; 43, connecting rod; 44, guide vane crank arm; 45, power unit; 451, worm; 452, worm gear; 453, motor; 5, support column; 6, transmission; 7, connecting block. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0026] The following will further elaborate on the present utility model in conjunction with the accompanying drawings. Embodiment
[0027] Referring to Figure 1 - Figure 3 , an adjustable thrust bearing device of the water turbine guide vane disclosed by the present utility model includes a movable guide vane 1. Baffles 2 are provided at both the top and bottom of the movable guide vane 1. A shaft hole 3 for positioning the movable guide vane 1 is provided on the side wall of the baffle 2. The movable guide vane 1 is connected to the shaft hole 3 through a rotating shaft, and the rotating shaft at the top of the movable guide vane 1 extends out of the baffle 2 and is connected to a transmission mechanism 4.
[0028] In this embodiment, when it is necessary to close the movable guide vane 1 to stop the water flow from flowing into the water turbine, the motor 453 in the transmission mechanism 4 operates to drive the worm 452 to rotate, thereby controlling the rotation of the worm gear 451. Subsequently, the worm gear 451 drives the turntable 42 to rotate through the connecting block 7, so that the connecting rod 43 connected to the outside of the turntable 42 pushes the guide vane crank 44 to drive the movable guide vane 1 to rotate, adjusting the inclination angle between the movable guide vanes 1, making the movable guide vanes 1 fit together to reduce the gap between them, thereby blocking the water flow.
[0029] When it is necessary to operate the water turbine, the motor 453 is operated to drive the worm 452 to reverse, thereby reversing the worm gear 451 to control the reverse rotation of the turntable 42. Subsequently, the connecting rod 43 is used to pull the guide vane crank 44 to rotate to open the movable guide vane 1, so that the water flow can enter the water turbine through the gap between the movable guide vanes 1 and drive the runner of the water turbine to rotate.
[0030] In a further preferred embodiment of the present utility model, as Figure 2 shown, the transmission mechanism 4 includes a top cover 41, a turntable 42, a connecting rod 43, a guide vane crank 44 and a power unit 45. A top cover 41 is arranged above the movable guide vane 1. The bottom of the top cover 41 is fixedly connected to the baffle 2 through a support column 5. The bottom of the top cover 41 is connected to a turntable 42 through a power unit 45. The bottom of the guide vane crank 44 is fixedly connected to the movable guide vane 1. The guide vane crank 44 and the turntable 42 are connected through a connecting rod 43.
[0031] In this embodiment, since the inclination angle of the movable guide vane 1 is adjusted by the rotation of the turntable 42, when the turntable 42 rotates, the connection point between the turntable 42 and the movable guide vane 1 will change due to the rotation of the turntable 42, resulting in an increase in the distance between the connection point and the movable guide vane 1. Therefore, if the movable guide vane 1 is directly connected to the turntable 42 through the guide vane crank 44, the turntable 42 will be restricted by the movable guide vane 1 and unable to rotate, making the inclination angle of the movable guide vane 1 fixed and unable to be flexibly adjusted. Therefore, a connecting rod 43 is also arranged between the movable guide vane 1 and the turntable 42, and when the turntable 42 rotates, the rotation of the connecting rod 43 is used to make up for the increased distance, avoiding jamming between the turntable 42 and the movable guide vane 1.
[0032] In a further preferred embodiment of the present utility model, as Figure 2 shown, a plurality of groups of movable guide vanes 1 are provided and are evenly arranged in the circumferential direction of the baffle 2.
[0033] In this embodiment, since the water turbine is submerged in water, water flow will pour into the water turbine from all around under the action of potential energy. As a result, multiple movable guide vanes 1 will be simultaneously impacted by the water flow. If the distances between two adjacent movable guide vanes 1 are different, the impact forces on both sides of the movable guide vane 1 will be different, leading to an imbalance in the pressures on both sides of the movable guide vane 1, and causing the movable guide vane 1 to be damaged by shear stress. Therefore, multiple movable guide vanes 1 are evenly distributed in the circumferential direction of the baffle 2, and the gaps between two adjacent movable guide vanes 1 are kept consistent, thereby enhancing the compressive capacity of the movable guide vanes 1.
[0034] In a further preferred embodiment of the present utility model, as Figure 2 shown, the guide vane crank arms 44 and the connecting rods 43 are provided in the same number as the movable guide vanes 1 and are evenly arranged in the circumferential direction of the turntable 42.
[0035] In this embodiment, since there are multiple movable guide vanes 1, if the rotation of the multiple movable guide vanes 1 is to be controlled uniformly, the connecting member used to connect the multiple movable guide vanes 1 needs to have a large compressive capacity. When one part of the connecting member is damaged, the entire connecting member needs to be replaced, which not only has a long maintenance cycle but also increases the usage cost. Therefore, multiple groups of guide vane crank arms 44 and connecting rods 43 are provided. When the turntable 42 rotates, the corresponding movable guide vanes 1 can be controlled by the individual guide vane crank arms 44 and connecting rods 43. Separate components can be replaced during maintenance, reducing the usage cost and effectively improving the maintenance efficiency.
[0036] In a further preferred embodiment of the present utility model, as Figure 3 shown, the power unit 45 includes a worm gear 451, a worm 452, and a motor 453. The outer side wall of the top cover 41 is fixedly connected with a motor 453. The output shaft of the motor 453 extends into the top cover 41 and is connected with a worm 452 through a transmission 6. One side of the worm 452 meshes with a worm gear 451.
[0037] In this embodiment, when the movable guide vanes 1 are opened, the movable guide vanes 1 will be impacted by the water flow, and the multiple movable guide vanes 1 will apply the impact of the water flow to the turntable 42, causing the turntable 42 to rotate. As a result, the turntable 42 will drive the control ring for controlling the turntable to rotate. However, the control ring is supported by the servomotor and cannot rotate. Therefore, a large shear stress will be generated at the connection between the servomotor and the control ring, causing the control ring to be damaged.
[0038] Therefore, the control loop is cancelled and the worm gear 451 is used to connect with the turntable 42. The worm gear 451 that drives the worm gear 451 to rotate when the turntable 42 is stressed is supported by the worm 452 and cannot rotate. A larger contact area between the worm gear 451 and the worm 452 is utilized to obtain a larger stress area, so that the pressure-bearing capacity of the thrust device is stronger, the service life of the thrust device can be effectively improved, and the anti-reverse characteristic between the worm gear 451 and the worm 452 can prevent the movable guide vane 1 from changing its inclination angle when impacted by water flow, making the use of the movable guide vane 1 more stable.
[0039] In a further preferred embodiment of the present invention, as Figure 2 shown, a connecting block 7 is formed by a protrusion at the bottom of the worm gear 451, and the bottom of the connecting block 7 is fixedly connected to the turntable 42.
[0040] In this embodiment, the connecting block 7 provided can connect the worm gear 451 and the turntable 42, enabling the worm gear 451 to better control the rotation of the turntable 42.
[0041] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.
Claims
1. An adjustable turbine guide vane thrust device, comprising a movable guide vane (1), characterized in that: The top and bottom of the movable guide vane (1) are both provided with baffles (2); a shaft hole (3) for positioning the movable guide vane (1) is provided on a side wall of the baffle (2); the shaft hole (3) is connected to the movable guide vane (1) via a rotating shaft; the rotating shaft at the top of the movable guide vane (1) extends out of the baffle (2) and is connected to a transmission mechanism (4); The transmission mechanism (4) comprises a top cover (41), a rotating disk (42), a connecting rod (43), a guide vane crank arm (44) and a power unit (45); a top cover (41) is arranged above the movable guide vane (1); the bottom of the top cover (41) is fixedly connected to the baffle (2) via a support column (5); the bottom of the top cover (41) is connected to the rotating disk (42) via the power unit (45); the bottom of the guide vane crank arm (44) is fixedly connected to the movable guide vane (1); and the guide vane crank arm (44) and the rotating disk (42) are connected via a connecting rod (43); The power unit (45) comprises a worm wheel (451), a worm (452) and a motor (453); the outer wall of the top cover (41) is fixedly connected to the motor (453); the output shaft of the motor (453) extends into the top cover (41) and is connected to the worm (452) via a transmission (6); and one side of the worm (452) is meshed with the worm wheel (451).
2. The adjustable turbine guide vane thrust device according to claim 1, characterized in that: The movable guide vanes (1) are provided in multiple groups and are evenly arranged in the circumferential direction of the baffle (2).
3. The adjustable turbine guide vane thrust device according to claim 2, characterized in that: The guide vane crank arms (44) and the connecting rods (43) are arranged in the same number as the movable guide vanes (1), and are evenly arranged in the circumferential direction of the rotating disk (42).
4. The adjustable turbine guide vane thrust device according to claim 3, characterized in that: A connecting block (7) is formed on the bottom protrusion of the worm wheel (451), and the bottom of the connecting block (7) is fixedly connected to the rotating disk (42).