A system and method for monitoring leakage of tailwater disc valve drain pipes of hydropower station generator sets

Abstract

The present invention discloses a system and method for monitoring leakage in the tailwater disc valve drain pipe of a hydropower station generator set, comprising a fixed plate fixed parallel to a gallery wall, a cantilever bracket fixedly mounted on the outer wall of the fixed plate, a vertical plate mounted between the tops of the cantilever brackets, a displacement sensor mounted on the vertical plate, a bracket mounted at the top end of the cantilever brackets, and a self-resetting water baffle mounted rotatably between the brackets; the tail bottom end of the self-resetting water baffle is supported on the top of the limit plate in a natural state, and the head end face of the self-resetting water baffle cooperates with the displacement sensor to monitor the rotation state of the self-resetting water baffle. When the preset measurement value of the sensor is exceeded, a controller and display arranged above the gallery shaft entrance can display the measurement data in real time and send an alarm signal to alert staff of which unit's tailwater disc valve is leaking. After the leakage is eliminated, the monitoring system automatically returns to normal and the alarm signal is restored.

Description

Technical Field

[0001] The present invention relates to the technical field of hydroelectric generator sets, and in particular to a system and method for monitoring leakage of a tailwater disc valve drain pipe of a generator set of a hydropower station. Background Art

[0002] Each generator unit in a hydropower station is designed with a tailwater disc valve. Generally, there are two of them, which are arranged at the lowest points on both sides of the tailwater pipe. Their main function is to open the tailwater disc valve when the unit is under maintenance to discharge the river water in the unit through the drainage pipe to the unit maintenance drainage corridor. After the river water is collected in the maintenance water collection well, it is pumped into the river channel outside the power plant through the maintenance drainage pump arranged in the power plant building.

[0003] During normal operation, the disc valves are closed, preventing river water from entering the maintenance drainage corridors. Most maintenance drainage corridors are enclosed and located on the lowest level of the power plant. The corridor bottom is several meters or even dozens of meters away from the maintenance personnel's work corridor. Maintenance personnel must descend via a vertical ladder into the corridor to observe disc valve leaks. For power plants with a large number of units, the corridor length can exceed 400 meters. Because the corridors fill with water during unit maintenance, lighting is not suitable. Furthermore, if personnel working in the corridor encounter an emergency, such as a significant disc valve leak, escape is difficult and could even be life-threatening. Therefore, a monitoring device is urgently needed to monitor the disc valve leaks of each unit without personnel entering the corridor, reducing on-site work risks and preventing accidents. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention aims to provide a system and method for monitoring leakage in the tailwater disc valve drain pipe of a hydropower station generator set. This monitoring system addresses the problem of the tailwater disc valve of the existing hydropower station generator set being unable to detect water leakage. By installing a monitoring system with a sensor at the corresponding position of the tailwater disc valve drain pipe outlet, the leaking water will strike the self-resetting water baffle at the front end of the device under the action of a parabola after flowing out of the pipe outlet. The self-resetting water baffle will move downward under the force, causing the sensor's measurement distance to suddenly increase. When the preset measurement value of the sensor is exceeded, the controller and display located above the corridor shaft entrance can display the measurement data in real time and issue an alarm signal to alert personnel to which unit's tailwater disc valve is leaking. After the leakage is eliminated, the monitoring system automatically returns to normal and the alarm signal is restored.

[0005] In order to achieve the above-mentioned technical effects, the purpose of the present invention is achieved as follows: a leakage monitoring system for the tailwater disc valve drain pipe of a hydropower station generator set, comprising a fixed plate fixed parallel to the corridor wall, a cantilever bracket fixedly installed on the outer wall of the fixed plate, a vertical plate installed between the top of the cantilever bracket, a displacement sensor installed on the vertical plate, a bracket installed at the top end of the cantilever bracket, and a self-resetting water baffle installed rotatably between the brackets; the tail bottom end of the self-resetting water baffle is supported on the top of the limit plate in a natural state, and the head end face of the self-resetting water baffle is coordinated with the displacement sensor to monitor the rotation state of the self-resetting water baffle.

[0006] The upper and lower parts of the fixing plate are respectively processed with fixing bolt holes, and the parts where the fixing bolt holes are located are fixedly connected to the corridor wall through bolts.

[0007] An oblique support rod is installed between the cantilever bracket and the fixing plate.

[0008] The number of the displacement sensors is at least one group.

[0009] Both sides of the self-resetting water baffle are rotatably supported on the top end of the bracket through pin shafts.

[0010] The self-resetting water baffle uses the pin shaft as the rotation axis and ensures that the torque on the side close to the displacement sensor is smaller than the torque on the other side, thereby ensuring that the self-resetting water baffle is always horizontally supported on the top of the limit plate when there is no water flow impact.

[0011] During installation, the self-resetting water baffle is located below the drain pipe, and ensures that the water flow can drive the self-resetting water baffle to rotate around the pin shaft when it flows out automatically to change the distance between the self-resetting water baffle and the displacement sensor.

[0012] The displacement sensor is connected to the controller via a waterproof transmission cable. The signal output end of the controller is connected to a display and an alarm, and can display monitoring data in real time and send out alarm signals.

[0013] The self-resetting water baffle adopts a cavity structure on the side close to the displacement sensor to reduce the weight of this side.

[0014] The method for detecting leakage using the tailwater disc valve drain pipe leakage monitoring system of a hydropower station generator set comprises the following steps:

[0015] Step 1: Layout and installation of monitoring system:

[0016] According to the number of drainage pipes, select the corresponding number of monitoring systems, and deploy a set of monitoring systems at each drainage pipe. Adjust the installation position to ensure that when the drainage pipe leaks, the water flow just hits the self-resetting water retaining plate.

[0017] Step 2: Wiring connection of monitoring system:

[0018] After the monitoring system is installed, all displacement sensors are connected to the controller through corresponding waterproof transmission cables to facilitate the subsequent transmission of monitored data to the controller;

[0019] Step 3: Monitor the normal operation of the system:

[0020] When the tailwater disc valve leaks, the leaking water will enter the drain pipe and be discharged from the drain pipe. After the leaking water flows out of the pipe, it will hit the self-resetting water baffle with self-resetting function at the front end of the monitoring system under the action of parabola. After the self-resetting water baffle is subjected to force, it will rotate around the pin shaft, causing the measuring distance of the displacement sensor to suddenly increase. When the preset measurement value of the displacement sensor is exceeded, the controller and display installed above the corridor shaft entrance can display the measurement data in real time and send an alarm signal through the alarm to alert the staff of which unit's tailwater disc valve has a leak, thereby reminding the staff to carry out timely maintenance;

[0021] Step 4: Automatic reset of the monitoring system:

[0022] After the tailwater disc valve fault is eliminated, no more water leakage will occur, and the self-resetting water baffle of the monitoring system will automatically reset and be supported on the top of the limit plate. At this time, the displacement sensor will automatically reset, the controller and display will return to normal monitoring, and the alarm signal will automatically disappear.

[0023] The present invention has the following beneficial effects:

[0024] 1. This invention installs a monitoring system with a sensor at the tailwater disc valve outlet. After leaking water flows out of the outlet, it strikes the self-resetting water baffle at the front of the device in a parabolic trajectory. The force applied to the baffle causes it to move downward, causing the sensor's measurement distance to suddenly increase. When the sensor's preset measurement value is exceeded, a controller and display located above the corridor shaft entrance display the measurement data in real time and issue an alarm signal, alerting personnel to the leaking tailwater disc valve of the unit. Once the leak is eliminated, the monitoring system automatically returns to normal, and the alarm signal is reset.

[0025] 2. The entire monitoring system can be reliably fixed on the inner wall of the corridor through the above-mentioned connection structure.

[0026] 3. The structural strength and stability between the cantilever bracket and the fixed plate are enhanced by the above-mentioned oblique support rods.

[0027] 4. The above-mentioned displacement sensor ensures the reliability and accuracy of signal monitoring.

[0028] 5. The above-mentioned rotating installation structure ensures that the self-resetting water baffle can rotate under the impact of water flow, thereby changing the distance between it and the displacement sensor.

[0029] 6. The self-resetting water baffle of the above structure ensures the subsequent normal monitoring process.

[0030] 7. Through the above arrangement and installation method, automatic monitoring of water leakage in the drainage pipe can be achieved.

[0031] 8. Through the above system, it is easy to realize remote transmission of signals and thus realize remote automatic monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below with reference to the accompanying drawings and examples.

[0033] Figure 1 It is the front view of the present invention.

[0034] Figure 2 It is a top view of the present invention.

[0035] Figure 3 It is a right side view of the present invention.

[0036] Figure 4 This is a connection diagram of the displacement sensor and controller of the present invention.

[0037] Figure 5 This is a state diagram of the present invention when there is no water leakage during the monitoring process.

[0038] Figure 6 This is a state diagram of the present invention when there is water leakage during the monitoring process.

[0039] In the figure: fixing bolt hole 1, fixing plate 2, displacement sensor 3, self-resetting water baffle 4, pin 5, limit plate 6, waterproof transmission cable 7, controller 8, display 9, corridor wall 10, drain pipe 11, inclined support rod 12, vertical plate 13, cantilever bracket 14, bracket 15. DETAILED DESCRIPTION

[0040] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0041] Example 1:

[0042] See also Figures 1 to 6A leakage monitoring system for the tailwater disc valve drain pipe of a hydropower station generator set includes a fixed plate 2 fixed parallel to a corridor wall 10, a cantilever bracket 14 is fixedly installed on the outer wall of the fixed plate 2, a vertical plate 13 is installed between the top of the cantilever bracket 14, a displacement sensor 3 is installed on the vertical plate 13, a bracket 15 is installed at the top end of the cantilever bracket 14, and a self-resetting water baffle 4 is rotatably installed between the brackets 15; the tail bottom end of the self-resetting water baffle 4 is supported on the top of the limit plate 6 in a natural state, and the head end face of the self-resetting water baffle 4 cooperates with the displacement sensor 3 to monitor the rotation state of the self-resetting water baffle 4. By installing a monitoring system with a sensor at the tailwater disc valve outlet, leaking water, after flowing out of the outlet, will strike the self-resetting water baffle 4 at the front of the device due to the parabolic effect. The force applied to the self-resetting water baffle 4 causes it to move downward, causing the measurement distance of the displacement sensor 3 to suddenly increase. When the displacement sensor 3 exceeds the preset measurement value, the controller and display located above the corridor shaft entrance can display the measurement data in real time and issue an alarm signal to alert personnel to the leak in the tailwater disc valve of the unit. Once the leak is eliminated, the monitoring system automatically returns to normal and the alarm signal is reset.

[0043] Furthermore, the upper and lower parts of the fixing plate 2 are respectively processed with fixing bolt holes 1, and the parts where the fixing bolt holes 1 are located are fixedly connected to the corridor wall 10 by bolts. The above connection structure can reliably fix the entire monitoring system on the inner wall of the corridor wall 10.

[0044] Furthermore, an oblique support rod 12 is installed between the cantilever bracket 14 and the fixed plate 2. The oblique support rod 12 enhances the structural strength and stability between the cantilever bracket 14 and the fixed plate 2.

[0045] Furthermore, the number of the displacement sensors 3 is at least one group. The above displacement sensors 3 ensure the reliability and accuracy of signal monitoring.

[0046] Furthermore, both sides of the self-resetting water baffle 4 are rotatably supported on the top of the bracket 15 by the pin 5. Through the above-mentioned rotating mounting structure, it is ensured that the self-resetting water baffle 4 can rotate under the impact of water flow, thereby changing the distance between it and the displacement sensor 3.

[0047] Furthermore, the self-resetting water baffle 4 uses the pin 5 as its rotation axis and ensures that the torque on the side close to the displacement sensor 3 is smaller than the torque on the other side, thereby ensuring that the self-resetting water baffle 4 is always horizontally supported on the top of the limit plate 6 when there is no water flow impact. The self-resetting water baffle 4 with the above structure ensures the subsequent normal monitoring process.

[0048] Furthermore, during installation, the self-resetting water baffle 4 is located below the drain pipe 11, and ensures that when water flows out automatically, it can drive the self-resetting water baffle 4 to rotate around the pin 5 to change the distance between the self-resetting water baffle 4 and the displacement sensor 3. Through the above arrangement and installation method, automatic monitoring of water leakage in the drain pipe 11 can be achieved.

[0049] Furthermore, the displacement sensor 3 is connected to a controller 8 via a waterproof transmission cable 7. The signal output terminal of the controller 8 is connected to a display 9 and an alarm, and can display monitoring data in real time and issue alarm signals. The above system facilitates remote signal transmission and thus realizes remote automatic monitoring.

[0050] Furthermore, the self-resetting water baffle 4 adopts a cavity structure on the side close to the displacement sensor 3 to reduce the weight of this side. The self-resetting water baffle 4 ensures that it can automatically reset after the leakage ends.

[0051] Example 2:

[0052] The method for detecting leakage using the tailwater disc valve drain pipe leakage monitoring system of a hydropower station generator set comprises the following steps:

[0053] Step 1: Layout and installation of monitoring system:

[0054] According to the number of drainage pipes 11, select the corresponding number of monitoring systems, and deploy a set of monitoring systems at the location of each drainage pipe 11. Adjust the installation position to ensure that when the drainage pipe 11 leaks water, the water flow just hits the self-resetting water baffle 4;

[0055] Step 2: Wiring connection of monitoring system:

[0056] After the monitoring system is installed, all displacement sensors 3 are connected to the controller 8 through corresponding waterproof transmission cables 7, so that the monitored data can be transmitted to the controller later;

[0057] Step 3: Monitor the normal operation of the system:

[0058] When the tailwater disc valve leaks, the leaking water will enter the drain pipe 11 and be discharged from the drain pipe 11. After the leaking water flows out of the pipe, it will hit the self-resetting water baffle 4 with a self-resetting function at the front end of the monitoring system under the action of a parabola. After the self-resetting water baffle 4 is subjected to force, it will rotate around the pin 5, causing the measuring distance of the displacement sensor 3 to suddenly increase. When the preset measurement value of the displacement sensor 3 is exceeded, the controller 8 and the display 9 arranged above the entrance of the corridor shaft can display the measurement data in real time and send an alarm signal through the alarm to alert the staff of which unit's tailwater disc valve has a leak, thereby reminding the staff to carry out timely maintenance.

[0059] Step 4: Automatic reset of the monitoring system:

[0060] After the tailwater disc valve fault is eliminated, no more water leakage occurs, the self-resetting water baffle 4 of the monitoring system automatically resets and is supported on the top of the limit plate 6. At this time, the displacement sensor 3 will automatically reset, the controller 8 and the display 9 will return to normal monitoring, and the alarm signal will automatically disappear.

Claims

1. A leakage monitoring system for tailwater disc valve drain pipes of hydropower station generator sets, characterized in that: The invention comprises a fixed plate (2) fixed parallel to the corridor wall (10), a cantilever bracket (14) fixedly mounted on the outer wall of the fixed plate (2), a vertical plate (13) mounted on the top of the cantilever bracket (14), a displacement sensor (3) mounted on the vertical plate (13), a bracket (15) mounted at the top end of the cantilever bracket (14), and a self-resetting water baffle (4) rotatably mounted between the brackets (15); the tail bottom end of the self-resetting water baffle (4) is supported on the top end of the limit plate (6) in a natural state, and the head end face of the self-resetting water baffle (4) is matched with the displacement sensor (3) to monitor the rotation state of the self-resetting water baffle (4); The upper and lower parts of the fixing plate (2) are respectively processed with fixing bolt holes (1), and the parts where the fixing bolt holes (1) are located are fixedly connected to the corridor wall (10) by bolts; An oblique support rod (12) is installed between the cantilever bracket (14) and the fixed plate (2); Both sides of the self-resetting water baffle (4) are rotatably supported on the top of the bracket (15) via the pin shaft (5); The self-resetting water baffle (4) uses the pin shaft (5) as a rotation axis and ensures that the torque on the side close to the displacement sensor (3) is smaller than the torque on the other side, thereby ensuring that the self-resetting water baffle (4) is always horizontally supported on the top of the limit plate (6) when there is no water flow impact; During installation, the self-resetting water baffle (4) is located below the drain pipe (11), and ensures that the water flow can drive the self-resetting water baffle (4) to rotate around the pin (5) when it flows out automatically, thereby changing the distance between the self-resetting water baffle (4) and the displacement sensor (3); The displacement sensor (3) is connected to the controller (8) via a waterproof transmission cable (7). The signal output end of the controller (8) is connected to a display (9) and an alarm, and can display monitoring data in real time and issue an alarm signal.

2. A hydropower station generator set tailwater disc valve drain pipe leakage monitoring system according to claim 1, characterized in that: The number of the displacement sensors (3) is at least one group.

3. A hydropower station generator set tailwater disc valve drain pipe leakage monitoring system according to claim 1, characterized in that: The self-resetting water baffle (4) adopts a cavity structure on the side close to the displacement sensor (3) to reduce the weight of this side.

4. A method for detecting leakage using a leakage monitoring system for a tailwater disc valve drain pipe of a hydropower station generator set according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: Layout and installation of monitoring system: According to the number of drainage pipes (11), a corresponding number of monitoring systems are selected, and a set of monitoring systems is respectively arranged at the location of each drainage pipe (11), and the installation position is adjusted to ensure that when the drainage pipe (11) leaks water, the water flow just impacts the self-resetting water baffle (4); Step 2: Wiring connection of monitoring system: After the monitoring system is installed, all displacement sensors (3) are connected to the controller (8) through corresponding waterproof transmission cables (7) so that the monitored data can be subsequently transmitted to the controller; Step 3: Monitor the normal operation of the system: When the tailwater disc valve leaks, the leaking water will enter the drain pipe (11) and be discharged from the drain pipe (11). After the leaking water flows out of the pipe, it will hit the self-resetting water baffle (4) with a self-resetting function at the front end of the monitoring system under the action of a parabola. After the self-resetting water baffle (4) is subjected to force, it will rotate around the pin shaft (5), causing the measurement distance of the displacement sensor (3) to suddenly increase. When the preset measurement value of the displacement sensor (3) is exceeded, the controller (8) and the display (9) arranged above the corridor shaft entrance can display the measurement data in real time and send an alarm signal through the alarm to warn the staff of which unit's tailwater disc valve has a leak, thereby reminding the staff to carry out timely maintenance. Step 4: Automatic reset of the monitoring system: After the tailwater disc valve fault is eliminated and water leakage stops, the self-resetting water retaining plate (4) of the monitoring system automatically resets and is supported on the top of the limit plate (6). At this time, the displacement sensor (3) automatically resets, the controller (8) and the display (9) return to normal monitoring, and the alarm signal automatically disappears.

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