Load pre-lifting water turbine governor power-loss shutdown control device

Abstract

The utility model discloses a load pre-lifting water turbine governor power-losing shutdown control device which comprises a water flowing pipe, the water flowing pipe is installed and connected to the position, close to the lower portion of an impeller and a governor gate, of a water turbine, a buffering water wheel box is arranged on one side of the water flowing pipe, and a load impeller is rotationally connected to the interior of the buffering water wheel box. According to the power-losing shutdown control device for the load pre-lifting water turbine governor, a load impeller connected to the bottom end of a governor brake pad is connected through a mechanical shaft rod to rotate, and when liquid filled into the governor brake pad is received, a shaft plate is driven to rotate along with rotation of the load impeller to close a pipeline; the electric drive gate is opened through electric drive to receive drained water, so that the load impeller drives the shaft plate to provide the lifting amount for closing in advance before power loss, the load shedding pressure of the unit caused by the water flow amount and the flow speed in the water turbine impeller space is reduced, the abnormal conditions such as rotating speed fluctuation and overspeed are reduced, and the risk of equipment damage is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydroturbine governors, and particularly to a power failure shutdown control device for a load pre-lifting hydroturbine governor. Background Technique

[0002] During the operation of a hydropower plant, the reliable operation of the hydroturbine governor is crucial. During the operation of a hydropower plant, when the hydroturbine governor loses power, due to the instantaneous disappearance of the power source, and the inertia of the hydroturbine itself and the action of the water flow, the unit speed will fluctuate greatly. When the governor encounters a power failure, it is necessary to ensure that the unit can stop safely and smoothly to avoid damage to the equipment and adverse effects on the power system. However, there are some deficiencies in the existing power failure shutdown control methods for hydroturbine governors.

[0003] At the moment of power failure of the existing hydroturbine, due to the sudden change of the load, the unit speed may fluctuate too much, and even cause the over-speed protection action, affecting the life and stability of the unit. Moreover, after the power failure, the power disappears instantly, and the load fails to be adjusted in time, which will cause the hydroturbine speed to drop or rise rapidly, exceeding the normal range. Since the traditional control method has insufficient adaptability when dealing with complex working conditions and different load conditions. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a power failure shutdown control device for a load pre-lifting hydroturbine governor, so as to solve the problem that after the power failure, the power disappears instantly, and the load fails to be adjusted in time, which will cause the hydroturbine speed to drop or rise rapidly, exceeding the normal range. Since the traditional control method has insufficient adaptability when dealing with complex working conditions and different load conditions as mentioned in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A power failure shutdown control device for a load pre-lifting hydroturbine governor, including a water flow pipe, which is installed and connected below the impeller and governor gate of the hydroturbine. A buffer water turbine box is arranged on one side of the water flow pipe, and a load impeller is rotatably connected inside the buffer water turbine box. The load impeller is located inside the buffer water turbine box to buffer and unload the incoming water flow.

[0006] An electric drive gate is arranged at the pipeline connecting the water flow pipe and the hydroturbine, and a rubber seal is arranged at the bottom end of the electric drive gate to abut against the inner wall surface of the water flow pipe. One side of the water flow pipe is connected to a steering working box, and a control valve is arranged on one side of the steering working box.

[0007] A liquid delivery anti-impulse component is arranged at the bottom end of the buffer water turbine box to relieve the pressure of the water flow received by the load impeller during the power failure process, buffer the water flow pressure, and buffer and adjust the stall of the load impeller.

[0008] The lifting column is arranged at the upper end of the steering working box. A cover plate is arranged at the bottom end of the output rod body of the lifting column, and a sealing member is arranged at the bottom end of the cover plate. An auxiliary impeller is sleeved on the surface of the output rod body of the lifting column. A protruding rod body is arranged at the bottom end of the cover plate, and a guiding frame is arranged on the surface of the rod body of the cover plate. The guiding frame is placed inside the guiding pipe.

[0009] Adopting the above technical solution, through the water flow receiving in the working area of the water turbine, the water pressure load on the unit in the shutdown state is further reduced.

[0010] Preferably, the water pipe penetrates through one side of the buffer water turbine box, and a pipe penetrating the bottom end is arranged on one side of the buffer water turbine box.

[0011] Adopting the above technical solution, through the setting of the buffer water turbine box, it is convenient for the load impeller to drive the governing valve gate to close in advance.

[0012] Preferably, the liquid delivery and anti - impact assembly includes:

[0013] The first solenoid valve, which is installed at the pipe orifice of the buffer water turbine box;

[0014] The drain pipe, one end of which is connected to the bottom end of the pipe of the buffer water turbine box, and the drain pipe is arranged in an F - shaped pipe structure;

[0015] The second solenoid valve, which is installed at the other port of the F - shaped pipe of the drain pipe;

[0016] The pressure pump, which is connected to the other port of the F - shaped pipe of the drain pipe, and a sealing member is arranged at the connection between the pressure pump and the second solenoid valve.

[0017] Adopting the above technical solution, the liquid delivery and anti - impact assembly prevents the accumulation of liquid inside the device from affecting the operation of the structure.

[0018] Preferably, the drain pipe is arranged at the bottom end of the load impeller, and a sealing plate is installed at the top end of the load impeller.

[0019] Adopting the above technical solution, through the cooperation of the load impeller and the drain pipe, an extra liquid discharge space is provided.

[0020] Preferably, the pressure pump is communicated with the drain pipe through the second solenoid valve, and the drain pipe is communicated with the buffer water turbine box through the first solenoid valve.

[0021] Adopting the above technical solution, through the cooperation of the pressure pump and the drain pipe, thrust is provided for the small amount of discharged liquid to facilitate the rapid emptying of the flowing water.

[0022] Preferably, the guiding frame is arranged in a spiral plate structure in the vertical direction, and a rubber ring is arranged at the connection between the guiding frame and the cover plate.

[0023] With the above technical solution, the spiral plate of the guiding frame is arranged to facilitate the discharge of water to the outside.

[0024] Preferably, the top end of the guiding pipe is installed at the bottom end of the steering work box, and the bottom end of the guiding pipe is arranged as a hopper-shaped pipe structure.

[0025] With the above technical solution, the excess water is discharged through the cooperation of the guiding pipe and the steering work box to maintain the internal stability.

[0026] Compared with the prior art, the beneficial effects of the present utility model are as follows: This load pre-lifting hydroturbine governor power failure shutdown control device:

[0027] 1. The load impeller installed at the bottom end of the governor brake is connected and rotated through a mechanical shaft. When receiving the liquid filled inside, as the load impeller rotates, it drives the shaft plate to rotate and close the pipe. Before the hydroturbine loses power, the electric drive gate is driven by electricity to open and receive drainage. The load impeller drives the shaft plate to provide an advance closing lift before power failure, reducing the flowing water volume and flow velocity in the hydroturbine impeller space, thus reducing the load rejection pressure on the unit, reducing the occurrence of abnormal conditions such as rotational speed fluctuations and overspeed, reducing the risk of equipment damage due to frequent impacts, and at the same time extending a certain time for the power system to detect and diagnose abnormalities, enabling the hydroturbine unit to operate stably for a long time.

[0028] 2. The electric drive gate opened in advance is connected to the pipe of the hydroturbine unit, thereby increasing the space for the water load in the hydroturbine. When the unit governor is in the state before power failure, the flowing water unloading space is further increased, achieving the effect of reducing the load rejection pressure in the unit. As the load impeller and the auxiliary impeller rotate to buffer the water flow impact, the pipes connected to the control valve and the guiding pipe discharge the excess water, reducing the occurrence of abnormal conditions such as rotational speed fluctuations and overspeed of the hydroturbine impeller, reducing the risk of equipment damage due to frequent impacts, and enabling the hydroturbine unit to operate stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a three-dimensional structure diagram of the overall installation of the present utility model;

[0030] Figure 2 is a three-dimensional structure diagram of the installation of the water pipe and the steering work box of the present utility model;

[0031] Figure 3 is a three-dimensional structure diagram of the overall internal front cross-section of the present utility model;

[0032] Figure 4 is a three-dimensional structure diagram of the overall internal top cross-section of the present utility model;

[0033] Figure 5 is a three-dimensional structure diagram of the overall internal side cross-section of the present utility model;

[0034] Figure 6 This is a three-dimensional structural schematic diagram of the installation of the buffer water turbine box and the pressure pump of the present utility model.

[0035] In the figure: 1, water flow pipe; 2, buffer water turbine box; 3, sealing plate; 4, load impeller; 5, electric drive gate; 6, solenoid valve 1; 7, drain pipe; 8, solenoid valve 2; 9, pressure pump; 10, steering working box; 11, control valve; 12, lifting column; 13, auxiliary impeller; 14, cover plate; 15, guide frame; 16, guide pipe. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0037] Please refer to Figures 1-6 , the present utility model provides a technical solution: a load pre-lifting water turbine governor power failure shutdown control device, including a water flow pipe 1, a buffer water turbine box 2, a sealing plate 3, a load impeller 4, an electric drive gate 5, a solenoid valve 1 6, a drain pipe 7, a solenoid valve 2 8, a pressure pump 9, a steering working box 10, a control valve 11, a lifting column 12, an auxiliary impeller 13, a cover plate 14, a guide frame 15 and a guide pipe 16;

[0038] Among them, the water flow pipe 1 is installed and connected below the impeller and the governor gate of the water turbine. A buffer water turbine box 2 is provided on one side of the water flow pipe 1, and a load impeller 4 is rotatably connected inside the buffer water turbine box 2. The load impeller 4 is located inside the buffer water turbine box 2 to buffer and unload the incoming water flow;

[0039] An electric drive gate 5 is provided at the pipe connection of the water flow pipe 1 and the water turbine, and a rubber seal member that abuts against the inner wall surface of the water flow pipe 1 is provided at the bottom end of the electric drive gate 5. The water flow pipe 1 is connected to a steering working box 10 on one side, and a control valve 11 is provided on one side of the steering working box 10. The water flow pipe 1 penetrates through one side of the buffer water turbine box 2, and a pipe penetrating the bottom end is provided on one side of the buffer water turbine box 2;

[0040] A liquid delivery anti-impulse assembly is provided at the bottom end of the buffer water turbine box 2 to relieve the pressure of the water flow received by the load impeller 4 during a power outage and buffer the water flow pressure;

[0041] The lifting column 12 is arranged at the upper end of the steering working box 10. At the bottom end of the output rod body of the lifting column 12, a cover plate 14 is provided, and a seal is provided at the bottom end of the cover plate 14. An auxiliary impeller 13 is sleeved on the surface of the output rod body of the lifting column 12. A protruding rod body is provided at the bottom end of the cover plate 14, and a guiding frame 15 is provided on the surface of the rod body of the cover plate 14. The guiding frame 15 is placed inside the guiding pipe 16. The guiding frame 15 is arranged as a vertically spiral plate structure, and a rubber ring is provided at the connection between the guiding frame 15 and the cover plate 14. The top end of the guiding pipe 16 is installed at the bottom end of the steering working box 10, and the bottom end of the guiding pipe 16 is arranged as a funnel-shaped pipe structure;

[0042] Combined with the attached drawings of the specification Figures 1-6 As shown, when in use, the water pipe 1 is connected to the part of the water turbine near the impeller and the governor gate. Before the water turbine governor loses power and shuts down, it is detected and controlled by the power system. At this time, the governor gate is not fully closed. By opening the electric drive gate 5 in advance, the water pipe 1 receives the flowing water part flowing from the governor gate to the water turbine impeller, so that the load impeller 4 located inside the buffer water wheel box 2 receives the flowing water impact thrust, and the mechanical shaft rod connected to the top end of the load impeller 4 drives the governor brake piece to rotate, increasing the closing opening and lifting position in advance. When the governor loses power and shuts down, the governor brake piece is closed in advance to close the pipeline, avoiding the further entry of flowing water. At this time, the water is further discharged through the drain pipe 7 to reduce the load, and the pressure relief space is increased through the opened control valve 11, and the auxiliary impeller 13 is used to further buffer the impact of the flowing water, avoiding excessive impact load on the output end of the lifting column 12. After the lifting column 12 is opened, the cover plate 14 provided at the bottom end is driven, so that the guiding frame 15 at the bottom end of the cover plate 14 is lifted, and part of the flowing water passes through the spiral plate of the guiding frame 15 and enters the inside of the guiding pipe 16. Through the setting of the guiding pipe 16, a pressure relief load space is provided for the large amount of water flowing into the water pipe 1. The spiral structure of the guiding frame 15 and the funnel-shaped structure of the guiding pipe 16 are used to increase the discharge speed of the flowing water. Through the cooperation of the electric drive gate 5 and the flowing water inside the unit, when the unit governor has a power outage and the gate is not closed, the flowing water unloading space is increased and the closing speed of the governor brake piece is pre-lifted, reducing the load rejection pressure of the unit. Through the connection of the electric drive gate 5 opened in advance and the water turbine unit pipeline, under the rotation cooperation of the load impeller 4 and the auxiliary impeller 13, the closing angle of the governor brake piece is pre-increased, and the control valve 11 and the guiding pipe 16 cooperate to provide a discharge space for the water accumulated in the water pipe 1, reducing the risk of equipment damage due to frequent impacts, enabling the water turbine unit to operate stably for a long time, and ensuring the stability inside the water turbine unit during power outage and shutdown;

[0043] The liquid delivery and anti-impact assembly includes:

[0044] The solenoid valve 6 is installed at the pipe orifice of the buffer water wheel box 2;

[0045] A drain pipe 7, one end of which is connected to the bottom end of the pipeline of the buffer water turbine box 2, and the drain pipe 7 is arranged in an F-shaped pipeline structure. The drain pipe 7 is arranged at the bottom end of the load impeller 4, and a sealing plate 3 is installed at the top end of the load impeller 4;

[0046] A second solenoid valve 8, which is installed at the other port of the F-shaped pipeline of the drain pipe 7;

[0047] A pressure pump 9, which is connected to the other port of the F-shaped pipeline of the drain pipe 7, and a seal is provided at the connection between the pressure pump 9 and the second solenoid valve 8. The pressure pump 9 is communicated with the drain pipe 7 through the second solenoid valve 8, and the drain pipe 7 is communicated with the buffer water turbine box 2 through the first solenoid valve 6;

[0048] Combined with the Figures 1-6 shown in the attached drawings of the specification, when the electric drive gate 5 is closed during the daily operation of the water turbine, and when an electrical anomaly is detected at the power system where the water turbine works, the electric drive gate 5 is opened in advance, so that the water pipe 1 receives the incoming water flow, causing the load impeller 4 to start rotating and drive the speed regulating valve blade to rotate to accelerate the closing speed. The first solenoid valve 6 and the drain pipe 7 installed in the pipeline at the bottom end of the buffer water turbine box 2 are kept closed in the powered state according to the power state to avoid the leakage of water flow, and are opened in the power-off state, so that the liquid inside the buffer water turbine box 2 flows to the outside. The second solenoid valve 8 arranged at one end of the drain pipe 7 starts the pressure pump 9 to provide an external pushing pressure for the discharged liquid when the water flow in the pipeline is scarce and the pressure is insufficient. It is arranged through the drain pipe 7 and the external pipeline to discharge the excess bearing water flow in the working area of the water turbine. Through the linkage between the pipelines, the device has good adaptability in the complex operating environment of the hydropower plant, is used to cooperate with the pressure relief and assistance during the operation of the governor, and provides auxiliary control processing for pressure relief during the power failure and shutdown of the water turbine governor.

[0049] Working principle: When using the power-off shutdown control device for the load pre-lifting water turbine governor, connect the water flow pipe 1 to the water flow in the water turbine governor pipeline. When the power system detecting the power abnormality during the operation of the water turbine, the electric drive gate 5 is opened in advance. Driven by the water flow, the load impeller 4 rotates, causing the load impeller 4 to drive the closing angle of the governor brake pads to close in advance. As the load impeller 4 rotates, the governor brake pads are closed. After isolating the water turbine impeller from the external water flow, the electric drive gate 5 is closed before the water turbine is powered on to open the governor brake pads. The solenoid valve 6 in the drain pipe 7 at the bottom of the buffer water wheel box 2 is opened, allowing the drain pipe 7 to receive part of the water flow brought in by the rotation speed of the load impeller 4. The solenoid valve 2 is connected to the pressure pump 9 to provide thrust for discharging the water flow inside the drain pipe 7. After the preliminary discharge through the drain pipe 7, the control valve 11 rotates and opens according to the water flow velocity condition to discharge the excess flowing water inside the water flow pipe 1. The guiding pipe 16 at the bottom of the steering working box 10, through the operation of the lifting column 12, opens the cover plate 14 to increase the discharge port. The spiral plate of the guiding frame 15 increases the water flow path, and together with the funnel-shaped structure of the guiding pipe 16, facilitates the discharge of the liquid from the guiding pipe 16, significantly improving the stability of the device during the entire operation process, reducing the risk of equipment damage due to frequent impacts, thus assisting the water turbine unit to operate stably for a long time and increasing the overall practicality.

[0050] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A load pre-lifting water turbine governor power failure shutdown control device, comprising: A water flow pipe (1), which is installed and connected below the impeller and governor gate of the water turbine. A buffer water turbine box (2) is arranged on one side of the water flow pipe (1), and a load impeller (4) is rotatably connected inside the buffer water turbine box (2). The load impeller (4) is located inside the buffer water turbine box (2) to buffer and unload the incoming water flow. It is characterized in that: an electric drive gate (5) is arranged at the pipe connection of the water flow pipe (1) and the water turbine, and a rubber seal is arranged at the bottom end of the electric drive gate (5) to abut against the inner wall surface of the water flow pipe (1). One side of the water flow pipe (1) is connected to a steering working box (10), and a control valve (11) is arranged on one side of the steering working box (10). A liquid delivery anti-impulse component is arranged at the bottom end of the buffer water turbine box (2) to relieve the pressure of the water flow received by the load impeller (4) during a power outage, buffer the water flow pressure, and buffer and adjust the stall of the load impeller (4). A lifting column (12) is arranged at the upper end of the steering working box (10). A cover plate (14) is arranged at the bottom end of the output rod body of the lifting column (12), and a seal is arranged at the bottom end of the cover plate (14). An auxiliary impeller (13) is sleeved on the surface of the output rod body of the lifting column (12). A protruding rod body is arranged at the bottom end of the cover plate (14), and a guide frame (15) is arranged on the surface of the rod body of the cover plate (14). The guide frame (15) is placed inside a guide pipe (16).

2. The load pre-lifting hydroturbine governor power failure shutdown control device according to claim 1, characterized in that: The water flow pipe (1) penetrates through one side of the buffer water turbine box (2), and a pipe penetrating the bottom end is arranged on one side of the buffer water turbine box (2).

3. The load pre-lifting hydroturbine governor power failure shutdown control device according to claim 1, characterized in that: The liquid delivery anti-impulse component includes: A solenoid valve I (6), which is installed at the pipe orifice of the buffer water turbine box (2). A drain pipe (7), one end of which is connected to the bottom end of the pipe of the buffer water turbine box (2), and the drain pipe (7) is arranged in an F-shaped pipe structure. A solenoid valve II (8), which is installed at the other port of the F-shaped pipe of the drain pipe (7). A pressure pump (9), which is connected to the other port of the F-shaped pipe of the drain pipe (7), and a seal is arranged at the connection of the pressure pump (9) and the solenoid valve II (8).

4. The load pre-lifting hydroturbine governor power failure shutdown control device according to claim 3, characterized in that: The drain pipe (7) is arranged at the bottom end of the load impeller (4), and a sealing plate (3) is installed at the top end of the load impeller (4).

5. The load pre-lifting hydro-turbine governor power failure shutdown control device according to claim 3, wherein: The pressure pump (9) is communicated with the drain pipe (7) through the solenoid valve II (8), and the drain pipe (7) is communicated with the buffer water turbine box (2) through the solenoid valve I (6).

6. The load pre-lifting hydroturbine governor power failure shutdown control device according to claim 1, characterized in that: The guide frame (15) is arranged in a spiral plate structure in the vertical direction, and a rubber ring is arranged at the connection of the guide frame (15) and the cover plate (14).

7. The load pre-lifting hydroturbine governor power failure shutdown control device according to claim 1, characterized in that: The top end of the guide pipe (16) is installed with the bottom end of the steering working box (10), and the bottom end of the guide pipe (16) is arranged in a funnel-shaped pipe structure.

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