Limiting device for movable guide vane of water turbine
By designing thrust blocks and stop blocks as limiting devices on the moving guide vanes of the turbine, the problems of traditional limiting devices being difficult to observe and having poor adaptability are solved, enabling convenient maintenance and stable limiting, and improving the safety and adaptability of the turbine.
Patent Information
- Application Number
- CN202520309042.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-02-25
AI Technical Summary
The limiting devices of traditional turbine guide vanes are difficult to observe position changes and damage during maintenance. Furthermore, due to vibration, gaps are generated, the limiting effect is not obvious, which affects the stable operation of the unit and has poor adaptability to different unit sizes.
A limiting device was designed, in which the thrust block is connected to the guide vane sleeve flange by fixing bolts, the thrust head is slidably engaged with the crank arm annular groove, and is installed on the outside of the equipment for easy observation and disassembly. The stop block is fixed in the fully open and fully closed positions to avoid gaps caused by vibration and enhance the limiting effect.
It enables convenient maintenance and stable limit switching, enhances the safety and practicality of the device, avoids affecting other equipment due to maintenance, adapts to different unit sizes, and improves the safety, stability and maintenance efficiency of the unit.
Smart Images
Figure CN223908313U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to water turbine accessory technology field especially relates to a limiting device for water turbine movable guide vane. BACKGROUND
[0002] The movable guide vane of water turbine will produce the buoyancy under the water pressure, and the guide vane will be lifted up when the buoyancy exceeds the guide vane self weight, so it is usually necessary to consider setting the guide vane thrust device to prevent the guide vane from lifting up and colliding with the top cover and affecting the stable operation of the unit. At the same time, the traditional limiting device also has the following problems:
[0003] 1. Other devices are installed on the inner side or lower part of the crank arm, and the position of the device cannot be directly observed during maintenance whether there is change, damage or wear, which is not convenient to replace or repair, and adjacent equipment needs to be repeatedly disassembled, which may affect the safe and stable operation of the unit due to the change of equipment performance after repeated disassembly;
[0004] 2. The traditional limiting device has a large gap due to long-term vibration, and loses its function;
[0005] 3. The traditional limiting device is relatively long, and a lot of force is lost due to the force arm, so the limiting effect is not obvious;
[0006] 4. The traditional limiting device is different in form for different sizes of water turbine generator units, which reduces the maintenance efficiency. SUMMARY
[0007] In view of the problems in the prior art, the utility model provides a limiting device for water turbine movable guide vane, which comprises a crank arm, the crank arm is rotationally connected with a guide vane sleeve flange, a crank arm ring groove is formed on the outer wall of the crank arm, a thrust block is arranged on the guide vane sleeve flange, a thrust head extends from the thrust block, and the structure of the thrust head is in sliding fit with the crank arm ring groove.
[0008] As a preferred scheme, the thrust block and the guide vane sleeve flange are fixedly connected through a fixing bolt.
[0009] As a preferred scheme, the lower plane of the thrust head in contact with the crank arm ring groove is provided with an anti-wear plate.
[0010] As a preferred scheme, the anti-wear plate and the thrust head are fixedly connected through a countersunk screw.
[0011] As a preferred scheme, a stop block is fixedly arranged in the crank arm ring groove.
[0012] As a preferred scheme, the stop block is arranged at the guide vane full opening position and the guide vane full closing position of the crank arm ring groove.
[0013] As a preferred solution, the thrust block and the thrust head are provided in two parts, and are arranged along the flange of the guide vane sleeve in axial symmetry.
[0014] The utility model discloses the beneficial effects of:
[0015] (1) the device is convenient to disassemble, overhaul and replace, compared with the limiting device installed in the inside or lower part of the crank arm, the device is installed on the outside of the equipment, first, the position of the device can be observed whether there is change influence, second, the damage or wear condition of the device can be directly measured and observed, third, compared with other devices hidden in the inside, the device can be directly removed and replaced or repaired, and the device can be directly installed.
[0016] (2) strong stability, first, the full opening and full closing positions of the guide vane are accurately measured, and the stop block is welded, so that the stop block does not need to be replaced and maintained in the later period, and the workload is reduced; second, the device is installed and fixed at the guide vane sleeve flange, which is equivalent to being fixed on the top cover with strong stability, so that the device can avoid generating too large gap due to long-term vibration and losing effect; third, the device can stably limit the position of the guide vane and the lifting phenomenon of the guide vane in actual application.
[0017] (3) safety is increased, first, when other devices need to be overhauled due to failure, many related equipment need to be removed, and after repeated disassembly, the performance of the equipment may be changed to affect the safe and stable operation of the unit, but the device can bypass all the equipment and be independently disassembled, so that the function of other equipment is not affected; second, compared with the traditional limiting device, the device has two stop blocks, and the acting force lost due to the force arm is avoided, so that the limiting effect is greatly enhanced, and the abnormal opening of the guide vane in special and accident conditions is avoided, or the guide vane body is limited from being damaged due to further expansion of the accident.
[0018] (4) wide practicability, the device is not affected by the size of the single installed capacity, and can be manufactured into an integrated device with unified form and appropriate size according to the size of the hydroelectric generating set. BRIEF DESCRIPTION OF DRAWINGS
[0019] Fig. 1 It is a whole structure schematic view of the utility model.
[0020] Fig. 2 It is a structure schematic view of the thrust block in the utility model.
[0021] In the drawing: 1, crank arm; 2, crank arm ring groove; 3, guide vane sleeve flange; 4, thrust block; 5, thrust head; 6, fixed bolt; 7, anti-wear plate; 8, countersunk screw; 9, stop block. DETAILED DESCRIPTION
[0022] The utility model will be further described in detail according to the drawings and specific embodiments.
[0023] Embodiment
[0024] As Figs. 1-2 shown in one of the water turbine guide vane limiting device, including the toggle 1, the toggle 1 and the guide vane sleeve flange 3 rotationally connected, the outer wall of the toggle 1 is provided with toggle ring groove 2, the guide vane sleeve flange 3 is provided with a thrust block 4, the thrust block 4 extends out the thrust head 5, the structure of the thrust head 5 and the toggle ring groove 2 sliding fit.
[0025] Further, the thrust block 4 and the guide vane sleeve flange 3 are fixedly connected by the fixing bolt 6.
[0026] Further, the lower plane of the thrust head 5 and the toggle ring groove 2 is provided with an anti-wear plate 7.
[0027] Further, the anti-wear plate 7 and the thrust head 5 are fixedly connected by the countersunk screw 8.
[0028] Further, the toggle ring groove 2 is fixedly provided with a stop block 9.
[0029] Further, the stop block 9 is arranged at the full open position and the full closed position of the guide vane.
[0030] Further, the thrust block 4 and the thrust head 5 are provided with two parts, which are arranged symmetrically along the guide vane sleeve flange 3.
[0031] The limiting process of the above limiting device is as follows: when the movable guide vane of the water turbine is floated under the action of water pressure, the two groups of thrust head 5 and the lower plane of the toggle ring groove 2 are matched to press the toggle 1 to prevent the movable guide vane from floating, and the anti-wear plate 7 is arranged on the lower plane of the thrust head 5 to prevent the thrust head 5 from being worn after long-term operation; when the movable guide vane is fully opened or fully closed, the side plane of the stop block 9 and the side plane of the thrust head 5 are in contact, thereby limiting the rotation of the movable guide vane, preventing the movable guide vane from being damaged due to the excessive rotation angle.
Claims
1. A limiting device for the guide vanes of a hydraulic turbine, comprising a lever (1), characterized in that, The elbow arm (1) is rotationally connected with the guide vane sleeve flange (3), an elbow arm ring groove (2) is formed on the outer wall of the elbow arm (1), the guide vane sleeve flange (3) is provided with a thrust block (4), a thrust head (5) extends from the thrust block (4), and the structure of the thrust head (5) is in sliding fit with the elbow arm ring groove (2).
2. A limiting device for the movable vane of a hydraulic turbine according to claim 1, characterized in that The thrust block (4) and the guide vane sleeve flange (3) are fixedly connected through a fixing bolt (6).
3. The limiting device for the wicket gate of a hydraulic turbine according to claim 1, characterized in that The lower plane of the thrust head (5) in contact with the elbow arm ring groove (2) is provided with an anti-wear plate (7).
4. A limiting device for the movable vane of a hydraulic turbine according to claim 3, characterized in that The anti-wear plate (7) and the thrust head (5) are fixedly connected through a countersunk screw (8).
5. The limiting device for the wicket gate of a hydraulic turbine according to claim 1, characterized in that The elbow arm ring groove (2) is fixedly provided with a stop block (9) therein.
6. A position limiting device for the wicket gate of a hydraulic turbine according to claim 5, characterized in that The stop block (9) is arranged at the full opening position and the full closing position of the guide vane in the elbow arm ring groove (2).
7. A limiting device for the movable vane of a hydraulic turbine according to any one of claims 1 to 6, characterized in that, The thrust block (4) and the thrust head (5) are provided with two parts and are arranged in axial symmetry along the guide vane sleeve flange (3).