Track type water turbine draft tube vortex control device

Abstract

The invention discloses a track type water turbine draft tube vortex control device, which relates to the technical field of draft tube vortex strip control, and comprises a supporting assembly, a movable fixing assembly, a vortex control assembly and a driving assembly, the supporting assembly comprises an elbow-shaped draft tube and a rail, and the rail is installed on the concave side wall face of the draft tube and used for conveying and bearing the movable fixing assembly. The movable fixing assembly comprises a movable unit and a fixing platform, the movable unit is nested on the supporting assembly and used for supporting the movable fixing assembly and fixing the movable fixing assembly at a designated position, and when the water turbine deviates from the optimal design working condition and rotational flow occurs in the draft tube, the first hydrofoil and the second hydrofoil are arranged to play a role in inhibiting the rotational flow; meanwhile, the first hydrofoil and the second hydrofoil can incline under the impact of rotational flow, local water flow is guided, secondary rotational flow is generated to damage original main rotational flow in the draft tube, the strength of the main rotational flow is further effectively prevented, and the influence of a vortex strip is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of draft tube vortex control, and in particular to a draft tube vortex control device for a track-type water turbine. Background Art

[0002] To date, there are many types of turbines, such as mixed flow type and axial flow type. Among them, the most commonly used is the mixed flow turbine. The common mixed flow turbine tailwater pipe adopts an elbow-shaped structure, consisting of an inlet straight cone section, an elbow section and an outlet diffusion section. The primary function of the tailwater pipe is to recover part of the remaining kinetic energy of the runner outlet water flow, convert it into pressure energy, and improve the efficiency of the turbine. In addition, the complex flow characteristics inside the tailwater pipe are one of the main causes of hydraulic instability of the turbine.

[0003] With the rapid development of the electric power industry, the power grid has put forward higher requirements on the stability and reliability of hydropower generation. Modern power systems require turbines to operate stably in a wider range of operating conditions to meet the electricity demand at different times. However, when the turbine deviates from the optimal operating condition, the circumferential velocity component of the water flow at the runner outlet increases, thereby forming a spiral vortex flow structure in the tailwater pipe, namely, the tailwater pipe vortex belt. The generation of this vortex belt will cause strong pressure pulsation, reduce efficiency, and cause noise pollution. In order to reduce the influence of the vortex belt, the main methods now are to set a guide device, an air supply device, and improve the tailwater pipe structure, but the results are not ideal. Therefore, a vortex control device for the tailwater pipe of a track-type turbine is proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a track type turbine tail tube vortex control device.

[0005] A track-type water turbine tail tube vortex control device, comprising a support component, a moving and fixing component, a vortex control component and a driving component;

[0006] The support assembly includes an elbow-shaped tailwater pipe and a track, wherein the track is installed on the concave side wall of the tailwater pipe and is used to transport and carry the mobile fixed assembly;

[0007] The mobile fixing assembly includes a mobile unit and a fixing platform, wherein the mobile unit is nested on the supporting assembly for the eddy current control assembly and fixes it at a designated position;

[0008] The vortex control assembly is mounted on a fixed platform and is used to guide the water flow, thereby generating a secondary vortex to destroy the original vortex in the tailwater pipe;

[0009] The driving assembly is an independent component, which is used to push the movable fixed assembly to move on the track, send it to a designated position, and then exit the tailwater pipe along the track.

[0010] Preferably, the cross-section of the track is a "mountain"-shaped structure, two first limit plates are connected to both sides of the track to limit the left and right movement of the movable fixed component, the middle rib of the track is provided with two symmetrically distributed grooves, each of the grooves is provided with a second limit plate to prevent the movable fixed component from leaving the track, and the track is provided with a plurality of fixing holes at equal distances between the two grooves.

[0011] Preferably, the mobile unit includes two pairs of L-shaped support plates, and the two pairs of support plates are symmetrically installed at the bottom of the fixed platform. A hollow main shaft is connected through each of the support plates, and a first roller is installed at one end of each main shaft. The two pairs of the first rollers are respectively placed in two grooves, and a second roller is installed at the bottom of each support plate. Each main shaft is coaxially slidably connected to a fixed rod, and the two fixed rods on the same side and the end away from the first roller are commonly connected to a connecting rod.

[0012] Preferably, the vortex control assembly includes a first hydrofoil and a second hydrofoil, wherein a rotating shaft is provided at an eccentric position of the first hydrofoil and the second hydrofoil, and the two rotating shafts are symmetrically installed on a fixed platform, and the first hydrofoil and the second hydrofoil are connected to a pin at one end away from the rotating shaft, and the two pins are connected to a synchronization rod for common rotation, and two pairs of limit plates are installed on the fixed platform, and the two pairs of limit plates are respectively arranged on both sides of the first hydrofoil and the second hydrofoil and are used to limit the maximum rotation angle of the first hydrofoil and the second hydrofoil.

[0013] Preferably, the driving assembly includes a power unit and two L-shaped mounting plates, two pairs of third rollers are installed at the bottom of the power unit, the two mounting plates are installed on both sides of the power unit, a pair of fourth rollers are installed at the end of the two mounting plates away from the power unit, and the pair of fourth rollers are respectively placed in two grooves, and a pair of mechanical arms are installed on both sides of the power unit to control the movement of the connecting rod to realize the lateral sliding adjustment of the fixed rod.

[0014] Preferably, a buffer spring is installed on each of the limit plates.

[0015] Preferably, a variety of flow field monitoring sensors are installed on the mobile fixed assembly.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. In the present invention, when the turbine deviates from the optimal design working condition and a vortex appears in the tailwater pipe, the first hydrofoil and the second hydrofoil are arranged to suppress the vortex. At the same time, the first hydrofoil and the second hydrofoil will tilt under the impact of the vortex, guide the local water flow, generate a secondary vortex to destroy the original main vortex in the tailwater pipe, further effectively prevent the intensity of the main vortex, and reduce the influence of the vortex belt.

[0018] 2. The present invention only requires the installation of a small track on the tailwater pipe, and the device can be removed when not in use, which can have a small impact on the flow state inside the tailwater pipe. The device is not limited to improving the flow state, and the shape of the device on the track can be appropriately changed to monitor the internal data of the tailwater pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention.

[0020] Figure 2 It is a structural schematic diagram of the present invention from another angle.

[0021] Figure 3 It is a schematic diagram of the structure of the support assembly in the present invention.

[0022] Figure 4 for Figure 2 Front view of .

[0023] Figure 5 It is a side view of the movable fixed component and the vortex control component in the present invention.

[0024] Figure 6 It is a top view of the vortex control component in the present invention.

[0025] Figure 7 A schematic structural diagram of the drive assembly in the present invention.

[0026] Figure 8 It is a top view of the vortex control assembly of the present invention when there is a vortex and it is clockwise.

[0027] Fig. 9 It is a top view of the vortex control assembly of the present invention when there is a vortex and it is counterclockwise.

[0028] In the figure: 1 support assembly, 11 tailwater pipe, 12 track, 121 first limit plate, 122 groove, 123 second limit plate, 124 fixing hole, 2 mobile fixed assembly, 21 moving unit, 211 support plate, 212 main shaft, 213 first roller, 214 second roller, 215 fixing rod, 216 connecting rod, 22 fixed platform, 3 vortex control assembly, 31 first hydrofoil, 32 second hydrofoil, 33 pin shaft, 34 synchronization rod, 35 rotating shaft, 36 limit plate, 37 buffer spring, 4 driving assembly, 41 power unit, 42 third roller, 43 mounting plate, 44 fourth roller, 45 mechanical arm. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0030] Reference Figure 1-7As shown, a track-type turbine draft tube vortex control device comprises a support component 1, a movable fixed component 2, a vortex control component 3 and a drive component 4;

[0031] The support assembly 1 comprises an elbow-shaped tailwater pipe 11 and a track 12, wherein the track 12 is installed on the concave side wall of the tailwater pipe 11 and is used to transport and carry the mobile fixed assembly 2;

[0032] The mobile fixing assembly 2 includes a mobile unit 21 and a fixed platform 22, wherein the mobile unit 21 is nested on the supporting assembly 1 to support the vortex control assembly 3 and fix it at a designated position;

[0033] The vortex control assembly 3 is mounted on the fixed platform 22 and is used to guide the water flow, thereby generating a secondary vortex to destroy the original vortex in the tailwater pipe 11;

[0034] The driving assembly 4 is an independent component, which is used to push the movable fixing assembly 2 to move on the track 12 and send it to a designated position, and then exit the tailwater pipe 11 along the track 12 .

[0035] In this embodiment, the cross-section of the track 12 is a "mountain"-shaped structure. Two first limit plates 121 are connected to both sides of the track 12 to limit the left and right movement of the movable fixed component 2. The middle rib of the track 12 is provided with two symmetrically distributed grooves 122. Each of the grooves 122 is provided with a second limit plate 123 to prevent the movable fixed component 2 from leaving the track 12. The track 12 is provided with a plurality of fixing holes 124 at equal distances between the two grooves 122.

[0036] In this embodiment, the mobile unit 21 includes two pairs of L-shaped support plates 211, and the two pairs of support plates 211 are symmetrically installed at the bottom of the fixed platform 22. A hollow main shaft 212 is connected through each of the support plates 211, and a first roller 213 is installed at one end of each of the main shafts 212. The two pairs of the first rollers 213 are respectively placed in two grooves 122, and a second roller 214 is installed at the bottom of each of the support plates 211. Each of the main shafts 212 is coaxially slidably connected to a fixed rod 215, and the two fixed rods 215 on the same side and at one end away from the first roller 213 are commonly connected to a connecting rod 216.

[0037] In this embodiment, the vortex control component 3 includes a first hydrofoil 31 and a second hydrofoil 32, and a rotating shaft 35 is provided at an eccentric position of the first hydrofoil 31 and the second hydrofoil 32. The two rotating shafts 35 are symmetrically installed on the fixed platform 22. The first hydrofoil 31 and the second hydrofoil 32 are connected to a pin shaft 33 at one end away from the rotating shaft 35. The two pin shafts 33 are connected to a synchronization rod 34 for rotating together. Two pairs of limit plates 36 are installed on the fixed platform 22. The two pairs of limit plates 36 are respectively arranged on both sides of the first hydrofoil 31 and the second hydrofoil 32 and are used to limit the maximum rotation angle of the first hydrofoil 31 and the second hydrofoil 32.

[0038] In this embodiment, the driving assembly 4 includes a power unit 41 and two L-shaped mounting plates 43, two pairs of third rollers 42 are installed at the bottom of the power unit 41, the two mounting plates 43 are installed on both sides of the power unit 41, and a pair of fourth rollers 44 are installed at one end of the two mounting plates 43 away from the power unit 41. The pair of fourth rollers 44 are respectively placed in two grooves 122, and a pair of mechanical arms 45 are installed on both sides of the power unit 41 for controlling the movement of the connecting rod 216 to realize the lateral sliding adjustment of the fixing rod 215.

[0039] In this embodiment, a buffer spring 37 is installed on each of the limit plates 36 to buffer the large impact force generated when the first hydrofoil 31 and the second hydrofoil 32 rotate.

[0040] In this embodiment, a variety of flow field monitoring sensors are installed on the mobile fixed component 2 to monitor some water flow data inside the tailwater pipe 11.

[0041] The working process and principle of the present invention are as follows:

[0042] When in use, the drive assembly 4 can be remotely controlled to move on the track 12, pushing the entire mobile fixed assembly 2 forward on the track 12. After reaching the preset position, the mechanical arm 45 can be controlled to push the connecting rods 216 on both sides of the mobile fixed assembly 2, so that the fixing rods 215 slide in the main shaft 212 and are inserted into the fixing holes 124 on the track 12, so as to fix the positions of the mobile fixed assembly 2 and the vortex control assembly 3, and then the drive assembly 4 is controlled to withdraw from the tailwater pipe 11.

[0043] When the turbine deviates from the optimal design condition and a vortex appears in the straight cone section of the tailwater pipe 11, the presence of the first hydrofoil 31 and the second hydrofoil 32 plays a role in suppressing the vortex. If the vortex is clockwise, the first hydrofoil 31 and the second hydrofoil 32 on the vortex control component 3 will tilt to the right to the limit plate 36 under the impact of the vortex. When the local water flow flows out along the channel formed by the first hydrofoil 31 and the second hydrofoil 32, a counterclockwise secondary vortex will be generated, which can further effectively prevent the intensity of the main vortex. If the direction of the main vortex is counterclockwise, the vortex control component 3 will run in the opposite direction.

[0044] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A track-type turbine draft tube vortex control device, characterized in that: It comprises a supporting component (1), a moving and fixing component (2), an eddy current control component (3) and a driving component (4); The support assembly (1) comprises an elbow-shaped tailwater pipe (11) and a track (12); the track (12) is installed on the concave side wall surface of the tailwater pipe (11) and is used to transport and carry the mobile fixed assembly (2); The movable fixing component (2) comprises a movable unit (21) and a fixed platform (22); the movable unit (21) is nested on the supporting component (1) and is used to support the vortex control component (3) and fix it at a designated position; The vortex control assembly (3) is mounted on a fixed platform (22) and is used to guide water flow, thereby generating a secondary vortex to destroy the original vortex in the tailwater pipe (11); The driving assembly (4) is an independent component, which is used to push the moving fixed assembly (2) to move on the track (12), and send it to a designated position, and then exit the tailwater pipe (11) along the track (12).

2. The track-type turbine draft tube vortex control device according to claim 1, characterized in that: The cross section of the track (12) is in the shape of a "mountain"; two first limit plates (121) are connected to the two sides of the track (12) for limiting the left and right movement of the movable fixed component (2); two symmetrically distributed grooves (122) are provided on the middle rib of the track (12); a second limit plate (123) is provided on each groove (122) for preventing the movable fixed component (2) from leaving the track (12); and a plurality of fixing holes (124) are provided on the track (12) at equal distances between the two grooves (122).

3. The track-type turbine draft tube vortex control device according to claim 2, characterized in that: The mobile unit (21) comprises two pairs of L-shaped support plates (211), the two pairs of support plates (211) are symmetrically mounted on the bottom of the fixed platform (22), a hollow main shaft (212) is connected through each of the support plates (211), a first roller (213) is mounted on one end of each of the main shafts (212), the two pairs of the first rollers (213) are respectively placed in two grooves (122), a second roller (214) is mounted on the bottom of each of the support plates (211), each of the main shafts (212) is coaxially slidably connected to a fixed rod (215), and the two fixed rods (215) on the same side and at one end away from the first roller (213) are commonly connected to a connecting rod (216).

4. The track-type turbine draft tube vortex control device according to claim 1, characterized in that: The vortex control assembly (3) comprises a first hydrofoil (31) and a second hydrofoil (32), wherein a rotating shaft (35) is provided at an eccentric position of the first hydrofoil (31) and the second hydrofoil (32), and the two rotating shafts (35) are symmetrically mounted on a fixed platform (22), and the ends of the first hydrofoil (31) and the second hydrofoil (32) away from the rotating shaft (35) are both connected to a pin shaft (33), and the two pin shafts (33) are rotatably connected to a synchronization rod (34), and two pairs of limit plates (36) are mounted on the fixed platform (22), and the two pairs of limit plates (36) are respectively arranged on both sides of the first hydrofoil (31) and the second hydrofoil (32) and are used to limit the maximum rotation angle of the first hydrofoil (31) and the second hydrofoil (32).

5. The track-type turbine draft tube vortex control device according to claim 3, characterized in that: The driving assembly (4) comprises a power unit (41) and two L-shaped mounting plates (43), two pairs of third rollers (42) are mounted at the bottom of the power unit (41), the two mounting plates (43) are mounted on both sides of the power unit (41), a pair of fourth rollers (44) are mounted at one end of the two mounting plates (43) away from the power unit (41), the pair of fourth rollers (44) are respectively placed in two grooves (122), and a pair of mechanical arms (45) are mounted on both sides of the power unit (41) for controlling the movement of the connecting rod (216) to realize the lateral sliding adjustment of the fixing rod (215).

6. The track-type turbine draft tube vortex control device according to claim 4, characterized in that: A buffer spring (37) is mounted on each of the limit plates (36).

7. The track-type turbine draft tube vortex control device according to claim 1, characterized in that: Various flow field monitoring sensors are installed on the mobile fixed component (2).

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