Water filling device for draft tube of water turbine

Abstract

The utility model particularly discloses a water filling device for a draft tube of a water turbine, which comprises a water delivery system capable of providing stable water flow with pressure to the interior of the draft tube; the length of the telescopic system extending into the draft tube can be adjusted in the direction perpendicular to the wall face of the draft tube; the direction adjusting device is used for indicating the direction of a water flow outlet in the draft tube; the supporting base is used for fixing the water conveying system, the telescopic system and the direction adjusting device on the wall surface of the draft tube; and the water stopping device is used for preventing water flow in the draft tube from leaking along the wall opening and the inner wall surface of the telescopic system. The water outlets are formed in the end and the side of the jet rod at the same time, on one hand, a water flow stagnation area in the center of the draft tube can be destroyed through jet flow of the water outlets in the end, jet flow opposite to the vortex strip precession direction can be generated through the water outlets in the side direction, and the vortex state is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy and hydropower engineering, in particular to a water turbine tailwater pipe water filling device. Background Art

[0002] At present, my country's hydropower stations are gradually shifting from base load operation to energy regulation operation, so they cannot guarantee operation under the designed conditions, resulting in rotating vortex belts and unstable output. The operation of turbines under biased conditions not only harms the hydropower units, but also generates noise and vibration problems, threatening the physical and mental health of power station workers. At present, there is an urgent need for a tailwater pipe vortex improvement device that is easy to install and adjust, which is used to suppress the rotating vortex belts in the tailwater pipe and reduce the violent pressure pulsation caused by the rotating vortex belts.

[0003] The measures of replenishing air and water have been proven to have the effect of suppressing the rotating vortex belt in the tailwater pipe. At present, it is often carried out through the main shaft hole of the runner, and it is also carried out from the straight cone section of the tailwater pipe. However, these devices can only replenish air and water in the vertical direction or horizontal direction, and the effect is limited. Therefore, it is urgent to develop a new type of water filling device for the tailwater pipe of the turbine to improve the unstable vortex under the partial working condition of the turbine, so as to achieve the purpose of reducing the vortex belt and its pressure pulsation in a wider operating range. Utility Model Content

[0004] In order to improve the problem of vortex in the tailwater pipe, the utility model provides a water filling device for the tailwater pipe of a water turbine.

[0005] The utility model provides a water turbine tailwater pipe water filling device adopts the following technical solution:

[0006] A water-turbine tailwater pipe filling device, comprising:

[0007] The water delivery system can provide a stable pressurized water flow into the tailwater pipe;

[0008] The telescopic system can adjust the length of the tailwater pipe in a direction perpendicular to the tailwater pipe wall;

[0009] A direction-adjusting device, used to adjust the direction of the water outlet inside the tailwater pipe;

[0010] A support base is used to fix the water delivery system and the telescopic system to the wall of the tailwater pipe;

[0011] The water-stop device is used to prevent the water inside the tailwater pipe from leaking along the wall opening and the water from leaking along the inner wall of the telescopic system.

[0012] Furthermore, the water delivery system includes a water filling pump, a water delivery hose, a one-way valve and a jet rod. The water filling pump is connected to the one-way valve inlet through the water delivery hose, and the one-way valve outlet is connected to the jet rod.

[0013] Further, the jet rod sequentially passes through the steering device and the telescopic system and enters the inside of the draft tube. An end water outlet hole and a lateral water outlet hole are arranged at one end of the jet rod close to the draft tube.

[0014] Further, the telescopic system includes a fixed rod, a rotating cap and a limiting frame. The fixed rod has an external thread, and the rotating cap has an internal thread. The two threads are meshed with each other. The rotating cap is arranged inside the limiting frame to prevent the fixed rod from moving by itself. The limiting frames are symmetrically arranged and fixed to the support base.

[0015] Further, the steering device is in a shape of a straight bar, fixed to the wall surface of the jet rod, embedded at the end of the fixed rod, and the straight bar direction corresponds to the orientation of the lateral water outlet hole of the jet rod.

[0016] Further, the support base is fixed at the opening on the wall surface of the draft tube.

[0017] Further, a leak-proof ring is arranged between the fixed rod and the wall surface of the support base, and the leak-proof ring is embedded on the inner wall of the support base.

[0018] Further, a leak-proof ring is arranged between the steering device and the wall surface of the fixed rod, and the leak-proof ring is embedded on the inner wall of the fixed rod.

[0019] In summary, the utility model includes at least one of the following beneficial technical effects:

[0020] 1. The jet rod of the utility model can telescopically adjust the length extending into the inside of the draft tube. Since the thickness of the vortex band formed inside the draft tube is different under different flow conditions, the stagnant flow area inside the vortex band can be maximally damaged by different extending lengths, thereby suppressing the spiral development, reducing the pressure pulsation, and ensuring the operation stability of the water turbine;

[0021] 2. By arranging water outlet orifices at the end and laterally of the jet rod of the utility model, on the one hand, the stagnant flow area at the center of the draft tube can be damaged by the jet from the end water outlet hole, and on the other hand, a jet with a direction opposite to the precession direction of the vortex band can be generated through the lateral water outlet hole, further improving the vortex state;

[0022] 3. The whole device of the utility model only needs to be installed by opening a hole in the straight conical section of the draft tube. The installation is simple and convenient. The transformation of the existing operating water turbine is simple, and the jet rod is thin, and will not have a great interference on the original flow field. Therefore, it has wide applicability. Description of the Drawings

[0023] Figure 1 is the overall structural schematic diagram of the embodiment of the utility model;

[0024] Figure 2 is the partial structural schematic diagram of the water outlet end of the jet rod of the utility model;

[0025] Figure 3 is a partial structural schematic diagram of the present utility model;

[0026] Figure 4 is a structural schematic diagram of the support base of the present utility model.

[0027] Reference numerals: 1, water filling pump; 2, water conveying hose; 3, check valve; 4, jet rod; 5, fixed rod; 6, support base; 7, limit frame; 8, rotating cap; 9, lateral water outlet hole; 10, end water outlet hole; 11, direction adjusting device; 12, leak-proof ring. Specific embodiments

[0028] The following will further elaborate on the present utility model in conjunction with the attached Figures 1-4 drawings.

[0029] An embodiment of the present utility model discloses a water filling device for a draft tube of a water turbine. Referring to Figure 1 , the water filling device for the draft tube of the water turbine includes a water conveying system capable of providing a stable pressurized water flow to the inside of the draft tube; a telescopic system capable of adjusting the length extending into the inside of the draft tube in a direction perpendicular to the wall surface of the draft tube; a direction adjusting device for indicating the orientation of the water flow outlet inside the draft tube; a support base for fixing the water conveying system, the telescopic system and the direction adjusting device to the wall surface of the draft tube; and a water stop device for preventing the water flow inside the draft tube from leaking along the wall opening and preventing the water flow from leaking along the inner wall surface of the telescopic system.

[0030] Referring to Figure 1 , Figure 3 , the water conveying system is composed of a water filling pump 1, a water conveying hose 2, a check valve 3 and a jet rod 4. The water filling pump 1 is connected to the inlet of the check valve 3 through the water conveying hose 2, and a steel hoop can be added to increase the connection tightness. The outlet of the check valve 3 is connected to the jet rod 4, which can prevent the water flow from flowing out reversely. The telescopic system includes a fixed rod 5, a rotating cap 8 and a limit frame 7. The fixed rod 5 has an external thread, and the rotating cap 8 has an internal thread, and the two threads are meshed with each other. The rotating cap 8 is arranged inside the limit frame 7 to prevent the fixed rod 5 from moving by itself. The limit frames 7 are symmetrically arranged and fixed to the support base 6. The limit frame 7 is in a frame shape and is arranged in the middle of the surface of the rotating cap 8. After the length of the fixed rod 5 extending into the inside of the draft tube is adjusted, the rotating cap 8 is tightened to make it abut against the limit frame 7 to prevent the fixed rod 5 from moving back and forth.

[0031] The fixed rod 5 can be telescopically adjusted to change the length extending into the inside of the draft tube, so as to adjust the length of the jet rod 4 extending into the inside of the draft tube. Since the thickness of the vortex band formed inside the draft tube is different under different flow conditions, by setting different extending lengths, the stagnant water area inside the vortex band can be maximally destroyed, thereby suppressing the spiral development and reducing the pressure pulsation, ensuring the stable operation of the water turbine.

[0032] Reference Figure 1 、 Figure 2 、 Figure 3 The jet rod 4 passes through the steering device 11 and the telescopic system in sequence and enters the inside of the draft tube. One end of the jet rod 4 close to the draft tube is provided with an end water outlet hole 10 and a lateral water outlet hole 9. The jet rod 4 can be telescopically adjusted and can also be rotationally adjusted along the side. By arranging water outlet holes at the end and laterally of the jet rod 4 at the same time, on the one hand, the jet through the end water outlet hole 10 can destroy the water flow stagnation area in the center of the draft tube, and on the other hand, the jet flowing in the opposite direction to the vortex band precession direction can be generated through the lateral water outlet hole 9 to further improve the vortex state. More specifically, under partial load conditions, if the rotation direction of the vortex band is the same as the runner direction (such as clockwise), the lateral water outlet orifice 9 should face the direction opposite to the runner rotation direction (i.e., counterclockwise). Under overload conditions, if the rotation direction of the vortex band is opposite to the runner direction (such as counterclockwise), the lateral water outlet orifice should face the direction same as the runner rotation direction (i.e., clockwise).

[0033] Reference Figure 3 The steering device 11 is in a shape of a straight bar, fixed on the wall surface of the jet rod 4, embedded at the end of the fixed rod 5, and the straight bar direction corresponds to the orientation of the lateral water outlet hole 9 of the jet rod 4. By rotating the steering device 11 outside the draft tube, the direction of the lateral water outlet hole 9 of the jet rod 4 inside the draft tube can be adjusted.

[0034] Reference Figure 1 The support base 6 is fixed at the opening on the wall surface of the draft tube. The support base is fixed on the side of the draft tube by bolts or welded to the side of the draft tube.

[0035] Reference Figure 4 A leak-proof ring 12 is provided between the wall surfaces of the fixed rod 5 and the support base 6. The leak-proof ring 12 is embedded on the inner wall of the support base 6 to prevent water leakage.

[0036] Reference Figure 3 A leak-proof ring 12 is provided between the wall surfaces of the steering device 11 and the fixed rod 5. The leak-proof ring 12 is embedded on the inner wall of the fixed rod 5 to prevent water leakage.

[0037] The whole device of the present utility model only needs to be installed by opening a hole in the straight conical section of the draft tube. The installation is simple and convenient. The transformation of the existing operating water turbine is simple, and the jet rod is relatively thin, and will not cause great interference to the original flow field. Therefore, it has wide applicability.

[0038] The above are all the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A water turbine draft tube water filling device, characterized in that, Comprising: A water conveyance system capable of supplying a stable pressurized water flow inside the draft tube; A telescopic system capable of adjusting the length extending into the draft tube in a direction perpendicular to the draft tube wall surface; An orientation adjustment device for adjusting the orientation of the water flow outlet inside the draft tube; A support base for fixing the water conveyance system and the telescopic system to the draft tube wall surface; A water stop device for preventing the water flow inside the draft tube from leaking along the wall opening and the water flow from leaking along the inner wall surface of the telescopic system.

2. The water filling device for the draft tube of a water turbine according to claim 1, characterized in that: The water conveyance system includes a charging pump, a water conveyance hose, a check valve and a jet rod. The charging pump is connected to the inlet of the check valve through the water conveyance hose, and the outlet of the check valve is connected to the jet rod.

3. The water filling device for a hydraulic turbine draft tube according to claim 2, characterized in that: The jet rod sequentially passes through the orientation adjustment device and the telescopic system and enters the draft tube. An end water outlet hole and a lateral water outlet hole are provided at one end of the jet rod close to the draft tube.

4. A water turbine draft tube water filling device according to claim 3, characterized in that: The telescopic system includes a fixed rod, a rotating cap and a limit frame. The fixed rod has an external thread, and the rotating cap has an internal thread, and the two threads are meshed with each other. The rotating cap is arranged inside the limit frame to prevent the fixed rod from moving by itself. The limit frames are symmetrically arranged and fixed to the support base.

5. The water filling device for the draft tube of a hydraulic turbine according to claim 4, characterized in that: The orientation adjustment device is in a shape of a straight bar, fixed to the wall surface of the jet rod and embedded at the end of the fixed rod. The straight bar direction corresponds to the orientation of the lateral water outlet hole of the jet rod.

6. A water turbine draft tube water filling device according to claim 1, characterized in that: The support base is fixed at the opening of the draft tube wall surface.

7. A water turbine draft tube water filling device according to claim 5, characterized in that: A leak-proof ring is provided between the fixed rod and the wall surface of the support base, and the leak-proof ring is embedded on the inner wall of the support base.

8. A water turbine draft tube water filling device according to claim 7, characterized in that: A leak-proof ring is provided between the orientation adjustment device and the wall surface of the fixed rod, and the leak-proof ring is embedded on the inner wall of the fixed rod.

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