Cyclone suppression device for draft tube of water turbine

Abstract

The utility model belongs to the technical field of water conservancy and hydropower engineering, and particularly relates to a water turbine draft tube rotational flow restraining device. The flexible flow suppression plate is arranged on the inner wall of the straight cone section of the draft tube and can be driven by an adjusting shaft of the angle adjusting device to rotate and bend around a limiting shaft of the supporting and limiting device, and the rotating center position, the rotating angle and the rotating radius of the flexible flow suppression plate can be flexibly adjusted through vertical movement of the limiting shaft and horizontal movement of the adjusting shaft; therefore, rotational flow in the draft tube is more effectively restrained, and safe and stable operation of the water turbine is guaranteed. The supporting limiting device and the angle adjusting device both adopt a driving device to drive a spiral lead screw to adjust the position of a sliding block, high adjusting precision is achieved, the rotating center position and angle of the flexible flow restraining plate can be accurately adjusted, and the internal flow state of the draft tube can be finely adjusted.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy and hydropower engineering, and particularly relates to a swirl suppression device for a water turbine tailwater pipe. Background Art

[0002] As a flow-through component for energy recovery, the turbine tailwater tube greatly affects the normal operation and energy characteristics of the turbine unit. The flow in the turbine is turbulent and unstable, and the flow pattern is relatively complex. When the turbine deviates from the design working condition, the tangential velocity component of the water flow at the runner outlet increases, and a strong vortex gradually develops inside the tailwater tube, which in turn produces a vortex belt phenomenon in the tailwater tube. The cause of the vortex belt phenomenon is the vortex motion of the water flow. Under partial load conditions, the vortex direction is the same as the direction of rotation of the runner, and the water flow rotates clockwise, while under overload conditions, the opposite is true, and the water flow rotates counterclockwise. The intensity of the vortex motion in the tailwater tube will directly affect the intensity of the pressure pulsation, thereby affecting the efficiency of the turbine and even its normal operation.

[0003] For large hydropower stations, if a straight tapered tailwater pipe is used, it will require a deeper excavation, which will result in large-scale engineering and high costs. Therefore, the tailwater pipe of large hydropower stations adopts an elbow-shaped tailwater pipe. Figure 1 As shown in the figure, the water inlet section of the elbow-shaped tailwater pipe is a conical tube, called the straight cone section, the elbow of the tailwater pipe is called the elbow section, the horizontal part of the turbine is called the horizontal diffusion section tube, and the vortex belt in the elbow-shaped tailwater pipe is generally generated in the straight cone section. Existing tailwater pipe swirl suppression measures, including fins, guide plates, etc., often adopt rigid wall structural measures, which are difficult to change and adjust according to the operating conditions of the turbine, resulting in the inability to fully exert its swirl suppression effect, and even have a negative impact on the stable operation and efficiency of the turbine. Therefore, it is urgent to improve the existing device so that it can be flexibly adjusted to meet the different operating conditions of the turbine. Utility Model Content

[0004] In view of the shortcomings of the prior art, the utility model provides a vortex suppression device for a tailwater pipe of a turbine, which can flexibly adjust the flow suppression angle and flow suppression direction of the flow suppression plate to adapt to different operating conditions of the turbine, thereby more effectively suppressing the vortex inside the tailwater pipe and ensuring the safe and stable operation of the turbine.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A turbine tailwater tube swirl suppression device, comprising:

[0007] Flexible flow suppression plate, top hanging installation on the inner wall of the straight cone section of the tailwater pipe;

[0008] A support and limit device, comprising a limit shaft that can slide up and down through the side wall of the straight cone section of the tailwater pipe, one end of the limit shaft located in the straight cone section can slide up and down and be connected to the flexible flow suppression plate, and the bending center of the flexible flow suppression plate is adjusted by sliding the limit shaft up and down;

[0009] The angle adjustment device comprises an adjustment shaft which can horizontally slide through the side wall of the straight cone section of the tailwater pipe, the adjustment shaft is located below the limit shaft, and one end of the adjustment shaft located in the straight cone section abuts against the flexible flow suppression plate to drive the lower end of the flexible flow suppression plate to rotate around the limit shaft.

[0010] Furthermore, an adjustment hole is opened in the middle of the flexible flow suppression plate in the vertical direction, and a first clamping part for clamping the flexible flow suppression plate is provided at one end of the limit shaft located in the straight cone section, and the first clamping part is connected to the adjustment hole by a first pin so as to be slidable up and down.

[0011] Furthermore, a second clamping portion for clamping the flexible flow suppression plate is provided at one end of the adjustment shaft located in the straight cone section, and the second clamping portion is connected to the adjustment hole in an upward and downward sliding manner via a second pin.

[0012] Furthermore, a horizontal support shaft is fixedly installed on the inner wall of the straight cone section of the tailwater pipe, and the top of the flexible flow suppression plate is rotatably mounted on the horizontal support shaft. The end of the horizontal support shaft away from the inner wall of the straight cone section is provided with a limiting device to prevent the flexible flow suppression plate from detaching.

[0013] Furthermore, the support and limiting device also includes a first driving device, a vertical screw connected to the output shaft of the first driving device, and a first slider threadedly connected to the vertical screw, and one end of the limiting shaft located outside the straight cone section is fixedly connected to the first slider.

[0014] Furthermore, the angle adjustment device also includes a second drive device, a horizontal lead screw connected to the output shaft of the second drive device, and a second slider threadedly connected to the horizontal lead screw, and one end of the adjustment shaft located outside the straight cone section is fixedly connected to the second slider.

[0015] Furthermore, a vertical slide groove matched with the limiting axis is provided on the side wall of the straight cone section of the tailwater pipe in the vertical direction, and a horizontal slide groove matched with the adjusting axis is provided in the horizontal direction, and the length of the vertical slide groove is not shorter than the length of the adjusting hole.

[0016] Furthermore, the length of the horizontal slide groove is set so that when the limiting axis is located at the topmost end of the adjusting hole, the rotation amplitude of the flexible flow suppression plate around the limiting axis is between -30° and 30°.

[0017] Furthermore, a first water stopper and a second water stopper are respectively provided on the outer sides of the vertical slide groove and the transverse slide hole.

[0018] Furthermore, the distance between the installation position of the horizontal support axis and the tailwater pipe inlet is not less than half of the tailwater pipe inlet diameter, the length of the flexible flow suppression plate in the vertical direction is not greater than the tailwater pipe inlet diameter, and the width of the flexible flow suppression plate along the horizontal support axis direction is not greater than one quarter of the tailwater pipe inlet diameter.

[0019] The beneficial effects of the utility model are:

[0020] 1. The flexible damping plate of the utility model is arranged on the inner wall of the straight cone section of the tailwater pipe, and when the adjusting shaft moves horizontally along the side wall of the tailwater pipe, the part of the flexible damping plate located between the limiting shaft and the adjusting shaft will be driven to rotate around the limiting shaft, and the height of the rotation center of the flexible damping plate can be adjusted by the vertical movement of the limiting shaft along the side wall of the tailwater pipe. Since the swirl direction and intensity generated by the turbine under different operating conditions are different, the rotation center position and rotation angle of the flexible damping plate can be flexibly adjusted through the vertical movement of the limiting shaft and the lateral movement of the adjusting shaft to adapt to different operating conditions of the turbine, thereby more effectively suppressing the swirl inside the tailwater pipe and ensuring the safe and stable operation of the turbine.

[0021] 2. The part of the flexible flow suppressor plate of the utility model located between the horizontal support axis and the limit axis does not bend and is arranged along the vertical direction, which can play a role in hindering the development of the tangential circulation of the water flow. The tangential velocity of the water flow is weakened after passing through this part, and then when the water flow passes through the bendable part of the flexible flow suppressor plate located between the limit axis and the adjustment axis, a circumferential component opposite to the swirl direction will be locally generated, which will then offset the main swirl to enhance the flow suppression effect of the flow suppressor plate.

[0022] 3. The support limit device and angle adjustment device of the utility model both use a driving device to drive the spiral screw to adjust the position of the slider, which has high adjustment accuracy. By adjusting the vertical position of the limit shaft and the lateral position of the adjustment shaft, the bending shape of the flexible flow suppression plate can be accurately adjusted, which is conducive to fine-tuning the internal flow state of the tailwater pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the elbow-shaped tailwater pipe structure;

[0024] Figure 2 This is a schematic diagram of the overall structure of a turbine tailwater tube swirl suppression device of the utility model;

[0025] Figure 3 It is a top view of the installation structure of the limit shaft of the utility model;

[0026] Figure 4 It is a top view of the angle adjustment device of the utility model;

[0027] Figure 5 It is a schematic diagram of the vertical chute and the horizontal chute on the side wall of the tailwater pipe of the utility model;

[0028] Figure 6 Schematic diagram of the rotation amplitude of the flexible flow suppression plate.

[0029] Reference numerals:

[0030] 100-draft tube, 110-straight cone section, 111-horizontal support shaft, 112-anchor bolt, 113-limiting nut, 114-vertical slide groove, 115-horizontal slide groove, 116-first water stop plug, 117-second water stop plug, 120-elbow section, 130-horizontal diffusion section, 140-draft tube inlet, 150-draft tube outlet;

[0031] 200-flexible flow suppression plate, 210-adjustment hole;

[0032] 300-supporting limiting device, 310-limiting shaft, 311-first clamping portion, 312-first pin, 320-first driving device, 330-vertical screw, 340-first slider, 341-threaded hole;

[0033] 400 - angle adjustment device, 410 - adjustment shaft, 411 - second clamping portion, 412 - second pin, 420 - second driving device, 430 - horizontal lead screw, 440 - second slider. DETAILED DESCRIPTION

[0034] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] like Figure 2 As shown, the utility model provides a turbine tailwater tube swirl suppression device, comprising:

[0038] The flexible flow suppression plate 200 is installed on the inner wall of the straight cone section 110 of the tailwater pipe in a top hanging manner;

[0039] The support limiting device 300 includes a limiting shaft 310 that can slide up and down through the side wall of the tailwater pipe straight cone section 110, and one end of the limiting shaft 310 located in the straight cone section 110 can be slid up and down and connected to the flexible flow suppression plate 200, and the bending center of the flexible flow suppression plate 200 is adjusted by sliding the limiting shaft 310 up and down;

[0040] The angle adjustment device 400 includes an adjustment shaft 410 that can horizontally slide through the side wall of the tailwater pipe straight cone section 110, and the adjustment shaft 410 is located below the limit shaft 310. One end of the adjustment shaft 410 located in the straight cone section 110 abuts against the flexible flow suppression plate 200 to drive the lower end of the flexible flow suppression plate 200 to rotate around the limit shaft 310.

[0041] like Figure 1As shown, the elbow-shaped tailwater pipe 100 includes a straight cone section, an elbow section 120, a horizontal diffusion section 130, a tailwater pipe inlet 140 and a tailwater pipe outlet 150. The vortex is generally generated in the straight cone section. The flexible flow suppression plate 200 of the utility model is arranged on the inner wall of the straight cone section 110. The limit shaft 310 is connected to the flexible flow suppression plate 200 by sliding up and down. The adjustment shaft 410 is located below the limit shaft 310, and one end of the adjustment shaft 410 located in the straight cone section 110 is in contact with the flexible flow suppression plate 200. When the adjustment shaft 410 moves horizontally along the side wall of the straight cone section, it will drive the lower end of the flexible flow suppression plate 200 to move, so that the part of the flexible flow suppression plate 200 located between the limit shaft 310 and the adjustment shaft 410 is bent and rotated with the limit shaft 310 as the center, so as to achieve the effect of suppressing the vortex in the tailwater pipe 100. By moving the limiting shaft 310 vertically along the side wall of the straight cone section, not only the height of the rotation center of the flexible damping plate 200 can be adjusted, but also its rotation angle can be adjusted. The lower the height of the connection between the limiting shaft 310 and the flexible damping plate 200, the greater the rotation angle of the flexible damping plate 200. Since the swirl direction and intensity generated by the turbine under different operating conditions are different (the swirl direction is the same as the rotation direction of the runner under partial load conditions, and the swirl direction is opposite under overload conditions), the utility model can adjust the rotation center height position and rotation radius of the flexible damping plate 200 by supporting the limiting shaft 310 in the limiting device 300 to move up and down, and at the same time, through the horizontal movement of the adjustment shaft 410 in the angle adjustment device 400, the rotation angle and rotation direction of the flexible damping plate 200 can be adjusted to adapt to different operating conditions of the turbine, thereby more effectively suppressing the swirl inside the tailwater pipe 100 and ensuring the safe and stable operation of the turbine.

[0042] In some embodiments, Figure 2 and Figure 3 As shown, the middle part of the flexible flow suppressing plate 200 is provided with an adjustment hole 210 in the vertical direction, and one end of the limiting shaft 310 located in the straight cone section 110 is provided with a first clamping portion 311 for clamping the flexible flow suppressing plate 200, and the middle part of the flexible flow suppressing plate 200 is installed in the first clamping portion 311, and the first clamping portion 311 and the adjustment hole 210 are connected to each other by sliding up and down through the first pin 312. The limiting shaft 310 is connected to the adjustment hole 210 by the first pin 312, which not only realizes the stable connection between the limiting shaft 310 and the flexible flow suppressing plate 200, but also the first pin 312 can move up and down in the adjustment hole 210, providing freedom for the up and down movement of the limiting shaft 310.

[0043] In some embodiments, Figure 4As shown, one end of the adjusting shaft 410 located in the straight cone section 110 is provided with a second clamping portion 411 for clamping the flexible flow suppressing plate 200, and the lower part of the flexible flow suppressing plate 200 is installed in the second clamping portion 411, and the second clamping portion 411 is connected to the adjusting hole 210 by a second pin 412 so as to be slidable up and down. When the part of the flexible flow suppressing plate 200 located between the limiting shaft 310 and the adjusting shaft 410 rotates around the limiting shaft 310, the second pin 412 moves in the adjusting hole 210 to realize the rotational motion.

[0044] In some embodiments, Figure 2 As shown, a horizontal support shaft 111 is fixedly installed on the inner wall of the straight cone section 110 of the tailwater pipe, and the top of the flexible flow suppression plate 200 is rotatably mounted on the horizontal support shaft 111. The end of the horizontal support shaft 111 away from the inner wall of the straight cone section 110 is provided with a limiting device to prevent the flexible flow suppression plate 200 from detaching. By setting the horizontal support shaft 111, on the one hand, the top position of the flexible flow suppressor plate 200 can be fixed, so that the part of the flexible flow suppressor plate 200 located between the horizontal support shaft 111 and the limit shaft 310 does not rotate and is set in the vertical direction, which can play a role in hindering the development of the tangential circulation of the water flow, and the tangential velocity of the water flow is weakened after passing through this part; then when the water flow passes through the rotatable part of the flexible flow suppressor plate 200 located between the limit shaft 310 and the adjustment shaft 410, a circumferential component opposite to the swirl direction will be generated locally, which will then offset the main swirl and achieve the effect of suppressing the swirl in the tailwater pipe 100; on the other hand, even if the support limit device 300 fails and the limit shaft 310 is removed, the flexible flow suppressor plate 200 can also rotate around the horizontal support shaft 111 as the center under the action of the adjustment shaft 410, and the effect of suppressing the swirl in the tailwater pipe 100 can still be achieved.

[0045] As a preferred embodiment, Figure 2 As shown, one end of the horizontal support shaft 111 is fixedly connected to the inner wall of the straight cone section 110 by an anchor bolt 112, and the limiting device is a limiting nut 113 installed at the other end of the horizontal support shaft 111. By setting the limiting device, the flexible flow suppression plate 200 can be prevented from being separated from the horizontal support shaft 111 during rotation, thereby ensuring the normal operation of the flexible flow suppression plate 200.

[0046] In some embodiments, Figure 2As shown, the support and limit device 300 also includes a first driving device 320, a vertical lead screw 330 connected to the output shaft of the first driving device 320, and a first slider 340 threadedly connected to the vertical lead screw 330, and one end of the limit shaft 310 located outside the straight cone section 110 is fixedly connected to the first slider 340. A vertical threaded hole 341 matching with the vertical lead screw 330 is opened in the middle of the first slider 340, and the first slider 340 is threadedly connected to the vertical lead screw 330 through the threaded hole 341. When the first driving device 320 is working, it will drive the vertical screw 330 to rotate, so that the first slider 340 and the limiting shaft 310 fixedly connected to the first slider 340 move in the vertical direction along the vertical screw 330 to adjust the height of the connection position between the limiting shaft 310 and the adjustment hole 210 on the flexible flow suppression plate 200, and then adjust the rotation center and rotation radius of the flexible flow suppression plate 200 to achieve the suppression of the vortex flow in the tailwater pipe 100 under different working conditions.

[0047] In some embodiments, Figure 2 and Figure 4 As shown, the angle adjustment device 400 also includes a second drive device 420, a horizontal lead screw 430 connected to the output shaft of the second drive device 420, and a second slider 440 threadedly connected to the horizontal lead screw 430, and the end of the adjustment shaft 410 located outside the straight cone section 110 is fixedly connected to the second slider 440. When the second drive device 420 is working, it will drive the horizontal lead screw 430 to rotate, so that the second slider 440 and the adjustment shaft 410 fixedly connected to the second slider 440 move in the horizontal direction along the horizontal lead screw 430. Since the adjustment shaft 410 is located below the limit shaft 310, the adjustment shaft 410 will drive the lower end of the flexible flow suppression plate 200 to move in the horizontal direction, so that the part of the flexible flow suppression plate 200 located between the limit shaft 310 and the adjustment shaft 410 rotates around the limit shaft 310 as the center, and adjust the rotation angle of the flexible flow suppression plate 200 to achieve the suppression of the vortex in the tailwater pipe 100 under different working conditions.

[0048] In some embodiments, Figure 5 As shown, a vertical slide groove 114 adapted to the limit shaft 310 is provided on the side wall of the tail tube straight cone section 110 in the vertical direction, and a horizontal slide groove 115 adapted to the adjustment shaft 410 is provided in the horizontal direction, the bottom position of the vertical slide groove 114 is not higher than the bottom position of the adjustment hole 210, the top position of the vertical slide groove 114 is not lower than the top position of the adjustment hole 210, and the length of the vertical slide groove 114 is not shorter than the length of the adjustment hole 210. The vertical slide groove 114 and the horizontal slide groove 115 guide and limit the motion range of the limit shaft 310 and the adjustment shaft 410, respectively, to achieve a better swirl suppression effect.

[0049] As a preferred embodiment, the length of the horizontal slide groove 115 is set so that when the limit axis 310 is located at the top of the adjustment hole 210, the rotation amplitude of the flexible flow suppressor plate 200 around the limit axis 310 is between -30° and 30°. The length of the horizontal slide groove 115 limits the minimum rotation amplitude of the flexible flow suppressor plate 200 around the limit axis 310. Figure 6 As shown in FIG. 1 , when the limiting axis 310 is located at the top of the adjustment hole 210, the amplitude α of the rotation of the flexible flow suppression plate 200 around the limiting axis 310 is 1 Between -30° and 30°, as the limiting shaft 310 moves downward along the adjusting hole 210, the amplitude α of the rotation of the flexible flow suppression plate 200 around the limiting shaft 310 2 When the limit axis 310 is located at the bottom of the adjustment hole 210, the flexible flow suppression plate 200 rotates around the limit axis 310 to the maximum. By adjusting the rotation amplitude of the flexible flow suppression plate 200 around the limit axis 310, the best swirl suppression effect can be achieved under different operating conditions of the turbine tail tube 100.

[0050] In some embodiments, Figure 3 and Figure 5 As shown, the first water stopper 116 and the second water stopper 117 are respectively disposed outside the vertical slide groove 114 and the transverse slide hole. The first water stopper 116 and the second water stopper 117 are preferably rubber water stoppers to prevent water from flowing out of the tailwater pipe 100 along the limit shaft 310 and the adjustment shaft 410.

[0051] As a preferred embodiment, the installation position of the horizontal support shaft 111 is at a distance from the tailwater pipe inlet 140 of not less than half the diameter of the tailwater pipe inlet 140. Since the tailwater pipe inlet 140 is connected to the runner outlet, the water flow and static interference effect are obvious. If the guide plate is too close to the tailwater pipe inlet 140, it will have a negative effect and affect the stability of the tailwater flow in the tailwater pipe 100. Therefore, the installation position of the horizontal support shaft 111 is at a vertical distance from the tailwater pipe inlet 140 of not less than half the diameter of the tailwater pipe inlet 140 to avoid the influence of the flow suppression plate on the flow stability of the tailwater pipe 100.

[0052] As a preferred embodiment, the length of the flexible flow suppressor plate 200 along the vertical direction is not greater than the diameter of the tailwater pipe inlet 140, and the width of the flexible flow suppressor plate 200 along the horizontal support axis 111 is not greater than one quarter of the diameter of the tailwater pipe inlet 140, so as to prevent the plate surface from being too large and easily damaged by the impact force of large water flow, and the thickness of the flexible flow suppressor plate 200 is less than 10 mm, so as to reduce the impact of the flow suppressor plate on normal water flow.

[0053] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Although the present invention is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent substitutions of the technical solutions of the present invention do not deviate from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A turbine draft tube swirl suppression device, characterized in that: include: Flexible flow suppression plate, top hanging installation on the inner wall of the straight cone section of the tailwater pipe; A support and limit device, comprising a limit shaft that can slide up and down through the side wall of the straight cone section of the tailwater pipe, one end of the limit shaft located in the straight cone section can slide up and down and be connected to the flexible flow suppression plate, and the bending center of the flexible flow suppression plate is adjusted by sliding the limit shaft up and down; The angle adjustment device comprises an adjustment shaft which can horizontally slide through the side wall of the straight cone section of the tailwater pipe, the adjustment shaft is located below the limit shaft, and one end of the adjustment shaft located in the straight cone section abuts against the flexible flow suppression plate to drive the lower end of the flexible flow suppression plate to rotate around the limit shaft.

2. A turbine draft tube vortex suppression device according to claim 1, characterized in that: An adjustment hole is provided in the middle of the flexible flow suppression plate in the vertical direction, and a first clamping part for clamping the flexible flow suppression plate is provided at one end of the limit shaft located in the straight cone section. The first clamping part is connected to the adjustment hole by sliding up and down through a first pin.

3. A turbine draft tube vortex suppression device according to claim 2, characterized in that: One end of the adjustment shaft located in the straight cone section is provided with a second clamping portion for clamping the flexible flow suppression plate, and the second clamping portion is connected to the adjustment hole through a second pin so as to be slidable up and down.

4. A turbine draft tube vortex suppression device according to claim 1, characterized in that: A horizontal support shaft is fixedly installed on the inner wall of the straight cone section of the tailwater pipe, and the top of the flexible flow suppression plate is rotatably mounted on the horizontal support shaft. A limiting device is provided at one end of the horizontal support shaft away from the inner wall of the straight cone section to prevent the flexible flow suppression plate from detaching.

5. The turbine draft tube vortex suppression device according to claim 1, characterized in that: The support and limiting device also includes a first driving device, a vertical screw connected to the output shaft of the first driving device, and a first slider threadedly connected to the vertical screw. One end of the limiting shaft located outside the straight cone section is fixedly connected to the first slider.

6. A turbine draft tube vortex suppression device according to claim 5, characterized in that: The angle adjustment device also includes a second drive device, a horizontal lead screw connected to the output shaft of the second drive device, and a second slider threadedly connected to the horizontal lead screw. One end of the adjustment shaft located outside the straight cone section is fixedly connected to the second slider.

7. A turbine draft tube vortex suppression device according to claim 2, characterized in that: A vertical slide groove matched with the limiting axis is provided on the side wall of the straight cone section of the tailwater pipe in the vertical direction, and a horizontal slide groove matched with the adjusting axis is provided in the horizontal direction. The length of the vertical slide groove is not shorter than the length of the adjusting hole.

8. A turbine draft tube vortex suppression device according to claim 7, characterized in that: The length of the horizontal slide groove is set so that when the limiting axis is located at the top of the adjustment hole, the rotation range of the flexible flow suppression plate around the limiting axis is between -30° and 30°.

9. A turbine draft tube vortex suppression device according to claim 7, characterized in that: A first water stop plug and a second water stop plug are respectively disposed on the outer sides of the vertical slide groove and the transverse slide hole.

10. The turbine draft tube vortex suppression device according to claim 4, characterized in that: The distance between the installation position of the horizontal support axis and the tailwater pipe inlet is not less than half of the tailwater pipe inlet diameter, the length of the flexible flow suppression plate in the vertical direction is not greater than the tailwater pipe inlet diameter, and the width of the flexible flow suppression plate along the horizontal support axis direction is not greater than one quarter of the tailwater pipe inlet diameter.

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