Tail water pipe device and adjusting method

Abstract

The invention provides a draft tube device and an adjusting method, and the draft tube device is characterized in that a draft tube body is provided with a water inlet and a water outlet; the water retaining structure comprises a first driving structure and a water retaining piece, the first driving structure is connected with the draft tube body, the first driving structure is in driving fit with the water retaining piece, the water retaining piece is rotatably arranged at the water inlet, and the water retaining structure has an avoiding state and a water retaining state; the air inflation structure comprises a plurality of air inflation parts arranged at the water inlet, the first end of each air inflation part is connected with the air exhaust structure, the second end of each air inflation part extends into the draft tube body and is located at the water inlet, and each air inflation part is provided with a plurality of air outlet holes; the pressure detection piece is arranged on the water retaining piece; and the controller is in signal connection with the pressure detection piece, the first driving structure and the inflation structure. According to the technical scheme, the problem that in the related technology, the inner wall of the draft tube body can be damaged by a tail water vortex strip is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of impulse engines, and more particularly, to a draft tube device and an adjustment method. Background Art

[0002] In the field of hydropower generation, impulse engines, such as water turbines, are key devices for converting the energy of water flow into rotational mechanical energy. The draft tube of a water turbine, as the passage for water flow to flow out of the runner and then into the downstream water body, its design and performance have an important impact on the overall efficiency and stability of the water turbine. However, in the prior art, during the operation of a water turbine, especially under high head and large flow conditions, a local low-pressure area is likely to form at the inlet of the draft tube below the runner, resulting in the phenomenon of tail water vortex band. The bubbles in the tail water vortex band rupture under the change of water flow pressure, forming cavitation, which not only damages the inner wall of the draft tube, causes vibration and noise of the unit, but also reduces the operating efficiency of the water turbine. The occurrence of cavitation phenomenon is mainly due to the uneven pressure distribution caused by the shear flow of water through the runner and the failure to effectively supplement air at the inlet of the draft tube.

[0003] Currently, common methods to solve the cavitation problem include optimizing the design of the water turbine runner, increasing the water flow pressure at the inlet of the draft tube, or using anti-cavitation materials, etc. Although these methods can alleviate the cavitation phenomenon to a certain extent, they all have certain limitations. For example, the optimization of the runner design may increase the manufacturing cost of the water turbine, and increasing the water flow pressure may lead to an increase in energy consumption. Summary of the Invention

[0004] The main object of the present invention is to provide a draft tube device and an adjustment method to solve the problem that the tail water vortex band in the related art will damage the inner wall of the draft tube body.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided a draft tube device, including: a draft tube body having an inlet and an outlet; a water blocking structure including a first driving structure and a water blocking member, the first driving structure is connected to the draft tube body, the first driving structure is in driving cooperation with the water blocking member, the water blocking member is rotatably provided at the inlet, and the water blocking structure has an avoidance state and a water blocking state; an inflation structure and an air extraction structure, the inflation structure includes a plurality of inflation members provided at the inlet, the first end of each inflation member is connected to the air extraction structure, the second end of each inflation member extends into the draft tube body and is located at the inlet, and a plurality of air outlet holes are provided on each inflation member; a pressure detection member provided on the water blocking member; and a controller, which is in signal connection with the pressure detection member, the first driving structure, and the inflation structure.

[0006] Furthermore, the gas component includes an inflation tube and an inflation head, the first end of the inflation tube is connected to the air extraction structure, the inflation head is arranged at the second end of the inflation tube, and a plurality of air outlet holes are arranged on the inflation head.

[0007] Furthermore, the inflation structure also includes multiple second drive structures, and the multiple second drive structures are all connected to the controller signal. The multiple second drive structures are arranged one-to-one with the multiple inflation tubes, and the correspondingly arranged second drive structures cooperate with the inflation tube drive to drive the inflation tube to extend and retract along the direction from the inside of the tailwater pipe body to the outside of the tailwater pipe body.

[0008] Furthermore, the telescopic length of the inflation tube is L, and L satisfies: in: ω is the vorticity, s -1 ; ▽ is the Hamiltonian operator; t is the running time of the second driving structure, s.

[0009] Furthermore, the inflation structure also includes an annular connecting tube, on which a first connecting port and a plurality of second connecting ports are provided, the first connecting port is connected to the air exhaust structure, and the plurality of second connecting ports are connected to the first ends of the plurality of inflation tubes in a one-to-one correspondence.

[0010] Furthermore, each second driving structure is connected between the annular connecting tube and the inflation tube.

[0011] Furthermore, there are multiple first drive structures and multiple water retaining members, and the multiple first drive structures and multiple water retaining members are arranged in a one-to-one correspondence, and the multiple water retaining members are arranged at intervals along the circumferential direction of the water inlet of the tailwater pipe body.

[0012] Furthermore, the tailwater pipe device also includes a mounting member, and the second end of each water retaining member is rotatably connected to the mounting member.

[0013] Furthermore, the mounting member is a mounting ring, and the mounting ring is located at the center of the water inlet.

[0014] Furthermore, in the circumferential direction at the water inlet, at least one inflatable member is provided between any two adjacent water retaining members.

[0015] According to another aspect of the present invention, a method for adjusting a tailwater pipe device is provided, for adjusting the tailwater pipe device, the tailwater pipe device being the above-mentioned tailwater pipe device, and the method for adjusting the tailwater pipe device comprises:

[0016] controlling the operation of the first driving structure and the inflatable structure according to the pressure detection value;

[0017] When the pressure detection value is greater than a first preset value and less than or equal to a second preset value, the controller controls the first driving structure to operate so that the water retaining structure switches from an avoidance state to a water retaining state, and controls the multiple inflatable parts to inflate;

[0018] When the pressure detection value is greater than the second preset value, the controller controls the first driving structure to stop running, so that the water blocking structure remains in the avoidance state.

[0019] Applying the technical solution of the present invention, the draft tube device includes a draft tube body, a water blocking structure, an inflation structure, an air extraction structure, a pressure detection member, and a controller. The draft tube body has a water inlet and a water outlet. The water blocking structure includes a first driving structure connected to the draft tube body and a water blocking member drivingly engaged with the first driving structure. The water blocking member is rotatably arranged at the water inlet. The inflation structure includes a plurality of inflatable members arranged at the water inlet. The first end of each inflatable member is connected to the air extraction structure, and the second end of each inflatable member extends into the draft tube body. The second end of each inflatable member is located at the water inlet, and a plurality of air outlet holes are arranged on each inflatable member. The pressure detection member is arranged on the water blocking member. The controller is in signal connection with the pressure detection member, the first driving structure, and the inflation structure. Through the above settings, when the pressure detection member detects a low pressure, the controller controls the first driving structure to operate, so that the first driving structure drives the water blocking member to rotate, so that the water blocking structure switches from the avoidance state to the water blocking state. Furthermore, the water blocking member can destroy the tail water vortex band. Furthermore, when the bubbles of the tail water vortex band contact the inner wall of the draft tube body during the flowing process, the bubbles will burst and release energy, forming a tiny shock wave, that is, forming cavitation phenomenon, which will damage the inner wall of the draft tube body and cause the turbine to vibrate and generate noise. The controller can also control the operation of the inflatable members of the inflation structure, that is, gas enters the draft tube body through a plurality of air outlet holes to achieve the air supplement function. Therefore, the technical solution of the present application effectively solves the problem that the tail water vortex band in the related art will damage the inner wall of the draft tube body. Description of the Drawings

[0020] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0021] Figure 1 Shows a three-dimensional structural schematic diagram of an embodiment of a draft tube device according to the present invention;

[0022] Figure 2 Shows Figure 1 a three-dimensional structural schematic diagram of the water blocking structure and the inflation structure of the draft tube device;

[0023] Figure 3 Shows Figure 1 a three-dimensional structural schematic diagram of the inflatable member and the second driving structure of the draft tube device;

[0024] Figure 4 Shows Figure 3Schematic cross-sectional view of the draft tube device;

[0025] Figure 5 shows Figure 1 Schematic three-dimensional structure view of the water retaining member of the draft tube device;

[0026] Figure 6 shows Figure 4 Schematic cross-sectional view of the water retaining member.

[0027] Among them, the above-mentioned drawings include the following reference numerals:

[0028] 10, draft tube body; 11, water inlet; 12, water outlet; 20, water retaining structure; 21, first driving structure; 22, water retaining member; 221, water retaining plate; 2211, plate segment; 222, elastic reset member; 30, inflation structure; 31, inflatable member; 311, air outlet hole; 312, inflation pipe; 313, inflation head; 314, communication pipe; 3141, first pipe segment; 3142, second pipe segment; 32, second driving structure; 33, annular connecting pipe; 40, air extraction structure; 50, pressure detection member; 60, controller; 70, mounting member; 71, mounting ring; 80, first connecting member; 81, first connecting shaft; 82, sliding plate; 90, third driving structure. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way restrictive of the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] It should be noted that the terms used here are only for describing the specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or their combinations.

[0031] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0032] When water flow passes through the runner of a water turbine, due to the rotational movement of the runner, shear flow will be generated in the water flow. This shear flow will cause a local low pressure to form at the lower end of the runner. When the local pressure in the water flow drops below the vapor pressure of water, bubbles will be generated in the water flow, forming a spiral draft-tube vortex band. When the bubbles in the draft-tube vortex band contact the inner wall of the draft-tube body during the flow process, the bubbles will burst and release energy, forming tiny shock waves, that is, cavitation phenomenon occurs, which will damage the inner wall of the draft-tube body, causing the water turbine to vibrate and generate noise.

[0033] As Figure 1 and Figure 2 As shown, the draft-tube device of this embodiment includes: a draft-tube body 10, a water-blocking structure 20, an air-inflating structure 30, an air-extracting structure 40, a pressure detection member 50, and a controller 60. The draft-tube body 10 has a water inlet 11 and a water outlet 12. The water-blocking structure 20 includes a first driving structure 21 and a water-blocking member 22. The first driving structure 21 is connected to the draft-tube body 10, and the first driving structure 21 is drivingly engaged with the water-blocking member 22. The water-blocking member 22 is rotatably arranged at the water inlet 11. The air-inflating structure 30 includes a plurality of air-inflating members 31 arranged at the water inlet 11. The first end of each air-inflating member 31 is connected to the air-extracting structure 40, and the second end of each air-inflating member 31 extends into the draft-tube body 10 and is located at the water inlet 11. A plurality of air outlet holes 311 are provided on each air-inflating member 31. The pressure detection member 50 is arranged on the water-blocking member 22. The controller 60 is in signal connection with the pressure detection member 50, the first driving structure 21, and the air-inflating structure 30.

[0034] Applying the technical solution of this embodiment, the tailwater pipe device includes a tailwater pipe body 10, a water retaining structure 20, an inflatable structure 30, an air extraction structure 40, a pressure detection member 50 and a controller 60. The tailwater pipe body 10 has a water inlet 11 and a water outlet 12. The water retaining structure 20 includes a first driving structure 21 connected to the tailwater pipe body 10 and a water retaining member 22 driven and matched with the first driving structure 21, and the water retaining member 22 is rotatably arranged at the water inlet 11. The inflatable structure 30 includes a plurality of inflatable members 31, and the plurality of inflatable members 31 are arranged at the water inlet 11. The first end of each inflatable member 31 is connected to the air extraction structure 40, and the second end of each inflatable member 31 extends into the tailwater pipe body 10. The second end of each inflatable member 31 is located at the water inlet 11, and each inflatable member 31 is provided with a plurality of air outlet holes 311. The pressure detection member 50 is arranged on the water retaining member 22. The controller 60 is signal-connected to the pressure detection member 50, the first drive structure 21, and the inflatable structure 30. Through the above-mentioned setting, when the pressure detection member 50 detects that the pressure is low, the controller 60 controls the first drive structure 21 to operate, so that the first drive structure 21 drives the water retaining member 22 to rotate, so that the water retaining structure 20 switches from the avoidance state to the water retaining state, and then the water retaining member 22 can destroy the tailwater vortex, thereby preventing the bubbles of the tailwater vortex from contacting the inner wall of the tailwater pipe body 10 during the flow process, which will cause the bubbles to burst and release energy, forming a small shock wave, that is, forming a cavitation phenomenon, damaging the inner wall of the tailwater pipe body 10, causing the turbine to vibrate and make noise. The controller 60 can also control the operation of the inflatable member 31 of the inflatable structure 30, that is, the gas enters the tailwater pipe body 10 through multiple air outlets 311 to achieve the air replenishment effect. Therefore, the technical solution of this embodiment effectively solves the problem that the tailwater vortex in the related art will damage the inner wall of the tailwater pipe body.

[0035] When the water retaining structure 20 is in the avoidance state, the width direction of the water retaining member 22 is parallel to the height direction of the tailwater pipe body 10. When the water retaining structure 20 is in the water retaining state, the width direction of the water retaining member 22 has a preset angle with the height direction of the tailwater pipe body 10, and the inflatable member 31 is inflated. In the width direction of the water retaining member 22, the thickness of the water retaining member first increases and then decreases, and the two ends of the width direction of the water retaining member are arc transitions.

[0036] It should be noted that the tailwater pipe device is one of the core components of the turbine and is installed inside the concrete. Its main function is to guide the water flow through the runner to ensure the stability of the turbine operation.

[0037] The water retaining member 22 comprises a water retaining plate 221 . The shape of the water retaining plate 221 is streamlined and the material of the water retaining plate 221 is high-strength stainless steel.

[0038] The pressure detection member 50 is a pressure sensor and is used to monitor the water pressure at the water inlet 11 of the tailwater pipe body 10 .

[0039] The first driving structure 21 can rotate the water baffle plate according to the detection value of the pressure detection component 50. When a spiral tailwater vortex appears, a low-pressure area will be formed. The controller 60 controls the first driving structure 21 to start, so that the water baffle plate is placed horizontally, that is, the water baffle member 22 is in a water-blocking state, and the generated tailwater vortex is destroyed. When the spiral tailwater vortex does not appear, in order to reduce the head loss during the flow of water, the controller 60 controls the first driving structure 21 to start, so that the water baffle plate is placed vertically, that is, the water baffle member 22 is in an avoidance state.

[0040] The first driving structure 21 is a driving motor.

[0041] The signal connection can be a wired connection or a wireless connection.

[0042] like Figures 1 to 3 As shown, in this embodiment, the inflatable member 31 includes an inflatable tube 312 and an inflatable head 313. The first end of the inflatable tube 312 is connected to the air extraction structure 40. The inflatable head 313 is disposed at the second end of the inflatable tube 312. The inflatable head 313 is provided with a plurality of air outlet holes 311. The air extraction structure 40 can extract gas, so that the gas flows to the inflatable head 313 through the inflatable tube 312, and then flows out through the plurality of air outlet holes 311 on the inflatable head 313. The air outlet holes 311 can ensure uniform air supply and avoid flow disorder caused by uneven air supply.

[0043] The inflation tube 312 and the inflation head 313 are both made of high-strength stainless steel.

[0044] like Figure 2 and Figure 3 As shown, in this embodiment, the inflatable structure 30 further includes a plurality of second drive structures 32, and the plurality of second drive structures 32 are all connected to the controller 60 by signal. The plurality of second drive structures 32 are arranged one-to-one with the plurality of inflatable tubes 312, and the correspondingly arranged second drive structures 32 drive and cooperate with the inflatable tubes 312 to drive and extend the inflatable tubes 312 from the inside of the draft tube body 10 to the outside of the draft tube body 10. When the pressure detection member 50 detects a low pressure, the controller 60 controls the second drive structure 32 to operate, and then the second drive structure 32 drives the inflatable tube 312 to extend and retract, so that the inflatable tube 312 moves to a position with a lower pressure for air replenishment.

[0045] like Figure 3 As shown, in this embodiment, the telescopic length of the inflation tube 312 is L, and L satisfies: in: ω is the vorticity, s -1▽ is the Hamiltonian operator. t is the operating time of the oil-pressure telescopic device, in seconds. Through the above settings, it is convenient to determine the telescopic length of the charging pipe.

[0046] It should be noted that the value of t can be determined according to actual needs.

[0047] As Figure 2 shown, in this embodiment, the inflation structure 30 further includes an annular connecting pipe 33. The annular connecting pipe 33 is provided with a first communication port and a plurality of second communication ports. The first communication port is communicated with the air extraction structure 40, and the plurality of second communication ports are respectively connected to the first ends of the plurality of charging pipes 312 in one-to-one correspondence. The gas drawn in by the air extraction structure 40 can flow into the annular connecting pipe 33 through the first communication port. Then, the gas can flow in the annular connecting pipe 33 to each second communication port, and then flow to each charging pipe 312.

[0048] The annular connecting pipe 33 is located outside the draft tube body 10. This facilitates the maintenance of the annular connecting pipe 33. In the concrete outside the draft tube device, there is an installation space for installing the annular connecting pipe 33.

[0049] The air extraction structure 40 includes an air suction pipe and a gas supplement tank. The gas supplement tank is provided with a storage space. The gas supplement tank is provided with an air inlet and an air outlet. Both the air inlet and the air outlet are communicated with the storage space. The air outlet is communicated with the first communication port, and the air suction pipe is communicated with the air inlet. A regulating valve is provided between the gas supplement tank and the first communication port, which can control the on-off between the air outlet and the first communication port.

[0050] The gas supplement tank can suck in the gas in the external environment and pressurize it to ensure that high-pressure gas flows out through the air outlet.

[0051] As Figure 2 shown, in this embodiment, each second driving structure 32 is connected between the annular connecting pipe 33 and the charging pipe 312. This facilitates the movement of the charging pipe 312 relative to the annular connecting pipe 33.

[0052] The second driving structure 32 extends from the outside of the draft tube body 10 to the inside of the draft tube body 10 and is connected to the charging pipe 312. The contact part between the second driving structure 32 and the draft tube body 10 is sealed.

[0053] The second driving structure 32 is an oil-pressure telescopic device. The oil-pressure telescopic device has excellent sealing performance and there is no air leakage caused by poor sealing during the air supplement process.

[0054] As Figure 4 shown, the inflatable part 31 further includes a plurality of connecting pipes 314. The charging pipe 312 is movably sleeved outside the first end of the connecting pipe 314, and the second end of the connecting pipe 314 is communicated with the annular connecting pipe 33.

[0055] The connecting pipe 314 includes a first pipe section 3141 and a second pipe section 3142. The first end of the first pipe section 3141 extends into the air charging pipe 312, and the air charging pipe 312 is movably sleeved outside the first pipe section 3141. The first end of the second pipe section 3142 is connected to the first pipe section 3141, and the second end of the second pipe section 3142 is connected to the annular connecting pipe 33. The first pipe section 3141 is arranged inside the oil pressure telescopic air supplement device.

[0056] When the oil pressure telescopic device replenishes oil, that is, when the oil pressure of the oil pressure telescopic device increases, the air charging pipe 312 can move towards the center of the water inlet. When the oil pressure of the oil pressure telescopic device decreases, the air charging pipe 312 can move in a direction away from the center of the water inlet.

[0057] The connection between the air charging pipe 312 and the first pipe section 3141 can be sealed to prevent hydraulic oil from entering the air charging pipe 312 through the connection between the air charging pipe 312 and the first pipe section 3141.

[0058] The connecting pipe 314 further includes a tapered pipe section connected between the first pipe section 3141 and the second pipe section 3142, which can enable the gas to flow more quickly. In the direction from the second pipe section 3142 to the air charging pipe 312, the diameter of the tapered pipe section gradually decreases, which can enable the gas to flow more quickly.

[0059] One end of the first pipe section 3141 far from the second pipe section 3142 has a gradually decreasing diameter in the direction from the second pipe section 3142 to the air charging pipe 312, which can enable the gas to flow more quickly.

[0060] Such as Figure 1 and Figure 2 As shown, in this embodiment, both the first driving structure 21 and the water blocking member 22 are multiple. The multiple first driving structures 21 and the multiple water blocking members 22 are arranged in one-to-one correspondence, and the multiple water blocking members 22 are arranged at intervals along the circumferential direction of the water inlet 11 of the draft tube body 10. This enables the multiple water blocking members 22 to cover a larger area, facilitating the water blocking members 22 to destroy the tail water vortex band.

[0061] Such as Figure 1 As shown, in this embodiment, the draft tube device further includes a mounting member 70, and the second end of each water blocking member 22 is rotatably connected to the mounting member 70. This enables the water blocking member 22 to be more stably arranged in the draft tube body 10 and facilitates the first driving structure 21 to drive the rotation of the water blocking member 22.

[0062] In the radial direction at the water inlet 11 of the draft tube body 10, the mounting member 70, the water blocking member 22, and the first driving structure 21 corresponding to the water blocking member 22 are arranged in sequence from the inside of the draft tube body 10 to the outside of the draft tube body 10.

[0063] As Figure 1 and Figure 2 shown, in this embodiment, the mounting member 70 is a mounting ring 71, and the mounting ring 71 is located at the central position of the water inlet 11. The setting of the mounting ring 71 enables the mounting member 70 to reduce the influence on the water flow.

[0064] The draft tube device further includes a flow velocity monitoring piece, and the flow velocity monitoring piece is arranged on the outer surface of the mounting ring 71.

[0065] The draft tube device further includes a coupling, the coupling is arranged on the mounting ring 71, and the second end of the water baffle 22 is connected to the mounting ring 71 through the coupling.

[0066] As Figure 1 and Figure 2 shown, in this embodiment, in the circumferential direction at the water inlet 11, at least one inflatable member 31 is arranged between any two adjacent water baffles 22. This facilitates the water baffle 22 to break the tail water vortex band, and at the same time, the inflatable member 31 can also perform targeted air replenishment.

[0067] When the pressure detection member 50 monitors that the water pressure is lower than the normal value, the pressure detection member 50 transmits the pressure information to the controller 60 arranged on the air replenishment tank through radio, and the controller 60 controls the suction pipe to suck air, and the air is pressed into the annular connecting pipe 33 through the air replenishment tank. The annular connecting pipe 33 is located above the oil pressure telescopic device, and the air enters a plurality of mutually parallel inflatable members 31 through the annular connecting pipe 33 and is inflated through the inflation head 313. The inflatable member 31 can perform precise air replenishment according to the actual pressure situation, and at the same time, when air replenishment is not required, it can be retracted to reduce the head loss caused by local obstacles during the water flow.

[0068] In the concrete outside the draft tube device, a plurality of inspection wells are arranged, and one inspection well is arranged at each first driving structure 21, and one inspection well is also arranged at the air extraction structure 40.

[0069] As Figure 6 shown, the water baffle 221 includes a plurality of plate segments 2211, and the plurality of plate segments 2211 are movably arranged in the radial direction of the water inlet 11, and two adjacent plate segments 2211 are nested.

[0070] There are a plurality of pressure detection members 50, and one pressure detection member 50 is arranged on each plate segment 2211.

[0071] The water baffle 22 further includes a plurality of elastic reset members 222, and at least one elastic reset member is arranged between two adjacent plate segments 2211 in one water baffle 221. This facilitates the reset of the plate segment 2211 after the plate segment 2211 moves.

[0072] The draft tube device further includes a first connecting member 80, and the first connecting member 80 is connected between the coupling and the second end of the water retaining member.

[0073] The first connecting member 80 includes a first connecting shaft 81 and a sliding plate 82, and the first connecting shaft 81 is installed between the mounting member 70 and the sliding plate 82.

[0074] Specifically, the first connecting shaft 81 is installed between the coupling and the sliding plate 82.

[0075] The sliding plate 82 is located in one of the plurality of plate segments 2211 closest to the mounting member 70 and is slidably arranged, guidingly cooperating with the inner wall of the plate segment 2211.

[0076] The draft tube device further includes a third driving structure 90 signal-connected to the controller, and the third driving structure 90 is arranged between the sliding plate 82 and the inner wall of one of the plurality of plate segments 2211 closest to the mounting member 70.

[0077] When the third driving structure 90 operates, it can push one of the plurality of plate segments 2211 closest to the mounting member 70 to move away from the mounting member 70, and then all the plurality of plate segments 2211 can move away from the mounting member 70, that is, the length of the water retaining plate 221 can be reduced, so that the plurality of plate segments 2211 can move to the area where the pressure values detected by the plurality of pressure detecting members 50 are smaller, which is convenient for more targeted destruction of the tail water vortex band.

[0078] The draft tube device further includes a second connecting shaft connected between the first driving structure 21 and the water retaining plate 221. There are a plurality of second connecting shafts, and the plurality of second connecting shafts are arranged in one-to-one correspondence with the plurality of first driving structures 21. The first end of the second connecting shaft is connected to the output shaft of the first driving structure 21. The second end of the second connecting shaft is connected to one of the plurality of plate segments 2211 farthest from the mounting member 70. The second connecting shaft passes through the draft tube body 10 and is connected to the output shaft of the first driving structure 21. A sealing arrangement is provided between the second connecting shaft and the draft tube body 10.

[0079] The draft tube of this embodiment is a draft tube of a water turbine with a vortex elimination and air supplement device for vibration and noise reduction. Vortex elimination is achieved through the water retaining member, and air supplement is achieved through the air filling structure, thereby achieving vibration and noise reduction.

[0080] As Figures 1 to 5 shown, in this embodiment, a method for adjusting the draft tube device is used to adjust the draft tube device. The draft tube device is the above-mentioned draft tube device. The method for adjusting the draft tube device includes:

[0081] Controlling the operation of the first driving structure 21 and the air filling structure 30 according to the pressure detection value.

[0082] When the pressure detection value is greater than the first preset value and less than or equal to the second preset value, the controller 60 controls the first driving structure 21 to operate so that the water retaining structure 20 switches from the avoidance state to the water retaining state, and controls the inflation of the multiple inflatable members 31. When the pressure detection value is greater than the second preset value, the controller 60 controls the first driving structure 21 to stop operating so that the water retaining structure 20 remains in the avoidance state.

[0083] Through the above arrangement, the controller can control the operation of the first driving structure and the inflation of the inflatable structure according to the detection value of the pressure detection member.

[0084] The first preset value is greater than 0. The second preset value is P, and P satisfies P less than 0.7P a .P a is standard atmospheric pressure.

[0085] The steps of controlling the operation of the first driving structure 21 and the inflatable structure 30 according to the pressure detection value include:

[0086] The pressure sensor detects the pressure;

[0087] The flow rate monitoring sheet detects the flow rate.

[0088] Through the above-mentioned setting, when the flow rate monitoring piece detects that the water flow rate is too high, when the pressure sensor detects that the pressure at the water inlet 11 of the tailwater pipe body 10 is too low, and a tailwater vortex is generated, the first driving structure drives the water retaining structure 20 to switch from the avoidance state to the water retaining state, and the tailwater vortex is destroyed. The airflow is transported into the tailwater pipe body 10 through the inflatable structure 30, and the airflow is transported to the low-pressure vortex area through the inflatable member 31 for air replenishment, so as to eliminate the bubbles generated by the tailwater vortex from acting on the inner wall of the tailwater pipe body 10, generating cavitation, so as to eliminate the damage to the tailwater pipe body 10 and the noise generated by the collapse of steam bubbles, and improve the operating efficiency and stability of the turbine.

[0089] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0090] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, the device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used herein will be made accordingly.

[0091] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the scope of protection of the present invention.

[0092] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A tailwater pipe device, characterized in that: include: A tailwater pipe body (10) having a water inlet (11) and a water outlet (12); The water retaining structure (20) comprises a first driving structure (21) and a water retaining member (22), wherein the first driving structure (21) is connected to the tailwater pipe body (10), the first driving structure (21) and the water retaining member (22) are drivingly matched, the water retaining member (22) is rotatably arranged at the water inlet (11), and the water retaining structure (20) has an avoidance state and a water retaining state; an inflatable structure (30) and an air extraction structure (40), wherein the inflatable structure (30) comprises a plurality of inflatable members (31) arranged at the water inlet (11), a first end of each inflatable member (31) being connected to the air extraction structure (40), a second end of each inflatable member (31) extending into the tailwater pipe body (10) and being located at the water inlet (11), and a plurality of air outlet holes (311) being arranged on each inflatable member (31); A pressure detection component (50) is arranged on the water retaining component (22); The controller (60) is signal-connected to the pressure detection component (50), the first driving structure (21), and the inflation structure (30).

2. The draft tube device according to claim 1, characterized in that: The inflatable member (31) comprises an inflatable tube (312) and an inflatable head (313); the first end of the inflatable tube (312) is connected to the air suction structure (40); the inflatable head (313) is arranged at the second end of the inflatable tube (312); and the inflatable head (313) is provided with a plurality of air outlet holes (311).

3. The draft tube device according to claim 2, characterized in that: The inflation structure (30) further includes a plurality of second drive structures (32), each of which is connected to the controller (60) by signal, and each of which is arranged in a one-to-one correspondence with the plurality of inflation tubes (312). The correspondingly arranged second drive structures (32) are driven in cooperation with the inflation tubes (312) to drive the inflation tubes (312) to extend and retract along a direction from the inside of the tailwater pipe body (10) to the outside of the tailwater pipe body (10).

4. The draft tube device according to claim 3, characterized in that: The telescopic length of the inflation tube (312) is L, and L satisfies: in: ω is the vorticity, s -1 ; ▽ is the Hamiltonian operator; t is the running time of the second driving structure, s.

5. The draft tube device according to claim 3, characterized in that: The inflation structure (30) further comprises an annular connecting tube (33), the annular connecting tube (33) being provided with a first connecting port and a plurality of second connecting ports, the first connecting port being connected to the air extraction structure (40), and the plurality of second connecting ports being connected to the first ends of the plurality of inflation tubes (312) in a one-to-one correspondence.

6. The draft tube device according to claim 5, characterized in that: Each of the second driving structures (32) is connected between the annular connecting tube (33) and the inflation tube (312).

7. The draft tube device according to claim 1, characterized in that: There are multiple first drive structures (21) and multiple water retaining members (22), and the multiple first drive structures (21) and the multiple water retaining members (22) are arranged one by one. The multiple water retaining members (22) are arranged at intervals along the circumferential direction of the water inlet (11) of the tailwater pipe body (10).

8. The draft tube device according to claim 7, characterized in that: The tailwater pipe device further comprises a mounting member (70), and the second end of each water retaining member (22) is rotatably connected to the mounting member (70).

9. The draft tube device according to claim 8, characterized in that: The mounting member (70) is a mounting ring (71), and the mounting ring (71) is located at the center of the water inlet (11).

10. The draft tube device according to any one of claims 1 to 9, characterized in that: In the circumferential direction at the water inlet (11), at least one inflatable member (31) is provided between any two adjacent water retaining members (22).

11. A method for adjusting a tailwater pipe device, for adjusting a tailwater pipe device, characterized in that: The tailwater pipe device is the tailwater pipe device according to any one of claims 1 to 10, and the tailwater pipe device adjustment method comprises: Controlling the operation of the first driving structure (21) and the inflatable structure (30) according to the pressure detection value; Wherein, when the pressure detection value is greater than a first preset value and less than or equal to a second preset value, the controller (60) controls the first driving structure (21) to operate, so that the water retaining structure (20) switches from the avoidance state to the water retaining state, and controls the inflation of the plurality of inflatable members (31); When the pressure detection value is greater than a second preset value, the controller (60) controls the first driving structure (21) to stop running, so that the water retaining structure (20) remains in the avoidance state.

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