Early warning and processing system for plant flooding of hydropower station

Abstract

The invention discloses an early warning and processing system for flooding of a factory building in a hydropower station. The early warning and processing system comprises a nested water intake device, a hydraulic operation subsystem and a water intake pipe internal flow velocity measurement and overspeed protection subsystem. On the basis of an existing hydropower station technology water supply and water taking system, a traditional fixed water taking opening structure is changed into a nested water taking opening structure, meanwhile, a hydraulic transmission mechanism is additionally arranged to control opening and closing of a water taking opening, and a water taking pipe inner flow speed measuring and transmission device and an overspeed protection system are additionally arranged; once the water taking pipeline leaks or bursts, the overspeed protection system is triggered to switch a control oil way in the hydraulic operation system in time, so that the hydraulic transmission mechanism is controlled to quickly close the water taking opening, the serious consequence that water continuously flows into a plant to flood the plant is avoided, and the overspeed protection system is low in construction difficulty and convenient to operate.

Description

Technical Field

[0001] The present invention relates to the field of unit technical water supply systems in hydropower stations, and particularly to a warning and treatment system for flooded powerhouses in hydropower stations. Background Art

[0002] The technical water supply system of a hydropower station mainly provides cooling water for cooling units such as the air coolers, bearing coolers, and transformer coolers of the generator motors, and provides lubricating water for the main shaft seal of the water turbine, the guide bearing of the water turbine, and the anti-leakage ring, etc. The technical water supply system mainly includes water sources, water intake pipe networks, valves, and automation components, etc. Common water intake methods for hydropower station technical water supply include: water intake from the penstock under pressure, water intake from the tailrace tunnel, and direct water intake from the reservoir, etc. Among them, for hydropower stations with direct water intake from the reservoir, the water intake is generally of a fixed structure, that is, the water intake pipe is installed at a position below the dead water level of the reservoir, a trash rack is set at the pipe orifice, and then the water intake pipe network is arranged in the form of buried pipes until inside the powerhouse, and finally valves, pumps, and automation components and other equipment are set in the exposed pipe part. For such a water intake system, since the reservoir is directly connected to the powerhouse through the water intake pipe network, once the first valve in the exposed pipe part of the water intake pipe in the powerhouse leaks or the water intake pipe before the valve bursts, it will be impossible to quickly and effectively prevent the water source in the reservoir from continuously flowing into the powerhouse through the water intake pipe, thus causing the serious consequence of flooding the powerhouse. In addition, if you want to permanently block such a water intake system, it is often necessary to use underwater pouring or underwater welding methods to block the water intake, and these methods not only have high construction difficulty, increase the construction cost, but also easily cause personal injury accidents. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a warning and treatment system for flooded powerhouses in hydropower stations. By modifying the water intake of the existing direct water intake system from the reservoir and adding a hydraulic operation system, a flow velocity measurement, and an overspeed protection device at the same time, the function of preventing the powerhouse from being flooded in the water intake system can be realized.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A warning and treatment system for flooded powerhouses in hydropower stations, including a nested water intake device, a hydraulic operation subsystem, a flow velocity measurement and overspeed protection subsystem in the water intake pipe;

[0006] The nested water intake device includes an inlet pipe and a water intake pipe in a nested structure, and the inlet pipe can perform telescopic movement along the axial direction inside the water intake pipe;

[0007] The hydraulic operation subsystem includes a hydraulic cylinder, a hydraulic oil pipeline, a pressure oil tank, a collecting tank, a reversing valve and a transmission rod; wherein, the hydraulic cylinder includes a piston cylinder and a T-shaped piston rod, the T-shaped piston rod is connected to the water inlet pipe through the transmission rod and can drive the water inlet pipe to move in the water intake pipe; the pressure oil tank supplies oil to the piston cylinder through the hydraulic oil pipeline, and the drained oil returns to the collecting tank through the hydraulic oil pipeline; the reversing valve is installed on the hydraulic oil pipeline and is used to switch the direction of the inlet and outlet oil circuits.

[0008] The flow velocity measurement and overspeed protection subsystem in the water intake pipe includes a speed measuring impeller, a speed measuring impeller shaft, a speed measuring gear, a transmission gear, a transmission shaft and a speed warning device; the speed measuring impeller shaft is supported in the water intake pipe, the speed measuring impeller and the speed measuring gear are fixed on the speed measuring impeller shaft, the transmission gear is fixed at the bottom end of the transmission shaft, the speed measuring gear meshes with the transmission gear, the top end of the transmission shaft extends out of the water intake pipe, and the speed warning device is fixed at the end of the transmission shaft extending out; the speed warning device is connected to the reversing valve and can control the reversing valve to act and switch the oil circuit direction of the inlet and outlet of the hydraulic cylinder.

[0009] Further, the T-shaped piston rod divides the piston cylinder into an opening chamber and a closing chamber, and an opening chamber inlet and outlet oil port and a closing chamber inlet and outlet oil port are respectively arranged at the corresponding positions of the side of the piston cylinder and the opening chamber and the closing chamber; the pressure oil discharged from the pressure oil tank enters the opening chamber or the closing chamber of the hydraulic cylinder through the hydraulic oil pipeline and returns to the collecting tank through the hydraulic oil pipeline; the reversing valve is installed on the hydraulic oil pipeline and divides the hydraulic oil pipeline into a pressure oil tank - reversing valve oil circuit, a reversing valve - hydraulic cylinder opening chamber oil circuit, a hydraulic cylinder closing chamber - reversing valve oil circuit, and a reversing valve - collecting tank oil circuit.

[0010] Further, a plurality of water intake holes are provided on the outer wall of the water inlet pipe; the end of the water inlet pipe is sealed with a flange cover, the end of the water intake pipe is provided with a flange plate, the flange cover and the flange plate are of matching sizes, and a sealing strip is provided inside the inner circle of the flange plate.

[0011] Furthermore, the rotational speed warning device includes a centrifugal block, a reversing switch, a mounting ring, a guiding block, a counterweight, and a support frame. The mounting ring is fixed on the transmission shaft. The guiding block and the counterweight are fixed on the opposite sides of the circumferential edge of the mounting ring to prevent the transmission shaft from being subjected to radial loads due to uneven weight distribution of the mounting ring, thereby affecting the accuracy of the overspeed protection device. The centrifugal block is installed in the guiding block through a spring. The reversing switch is fixed on the support frame. The reversing switch and the support frame are arranged near the mounting ring, and there is a layout distance between the reversing switch and the centrifugal block. The support frame and the reversing valve are of an integrated structure. After the centrifugal block acts on the reversing switch, the reversing switch controls the movement of the spool of the reversing valve, thereby realizing the switching of the oil circuit of the opening chamber of the reversing valve - hydraulic cylinder and the oil circuit of the hydraulic cylinder closing chamber - reversing valve.

[0012] Furthermore, an oil pump is provided inside the oil collecting tank for pumping the returned oil in the oil collecting tank back to the pressure oil tank to realize the recycling of the hydraulic oil.

[0013] Furthermore, a main shaft sealing device is provided at the place where the transmission shaft extends out of the water intake pipe to prevent the water flow in the water intake pipe from leaking along the transmission shaft.

[0014] Furthermore, the stroke limit of the T-shaped piston rod moving in the hydraulic cylinder corresponds to the full opening and closing of the nested water intake device.

[0015] Furthermore, the speed measuring impeller and the speed measuring impeller shaft are fixed in the water intake pipe through an impeller shaft bearing and an annular fixing bracket.

[0016] Furthermore, the hydraulic cylinder is provided with a mechanical locking device. When the T-shaped piston rod moves to the limit position of the closing chamber, the mechanical locking device is used to prevent the T-shaped piston rod from malfunctioning, thereby ensuring that the water intake is in a closed state.

[0017] Furthermore, the rotational speed warning device has an attached voice alarm prompt function.

[0018] The beneficial effects of the present invention are as follows:

[0019] In view of the existing hydropower stations that directly draw water from reservoirs, the present invention transforms the traditional fixed water intake into a nested water intake device that can be controlled to open and close by a hydraulic operating system. At the same time, a flow velocity measurement and overspeed protection system is added to the water intake pipe. The rotational speed warning device is linked with the reversing valve in the hydraulic operating system. Once a leakage or pipe burst occurs in the water intake pipe, when the water flow velocity increases and triggers the rotational speed warning device to act, the flow direction of the hydraulic oil in the hydraulic operating system can be immediately switched, thereby quickly closing the water intake device, further preventing the water flow from continuously pouring into the powerhouse along the water intake pipe, and avoiding the occurrence of the accident of flooding the powerhouse. Moreover, the water intake system of the hydropower station of the present invention has low construction difficulty and is convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a three-dimensional schematic diagram of the warning and treatment system for flooding the powerhouse of the hydropower station according to the embodiment of the present invention.

[0021] Figure 2 FIG. is a schematic diagram of the open state of the nested water intake device.

[0022] Figure 3 FIG. is a schematic diagram of the closed state of the nested water intake device;

[0023] Figure 4 FIG. is a schematic diagram of the composition of the flow velocity measurement and overspeed protection system in the water intake pipe.

[0024] Figure 5 FIG. is a schematic diagram of the hydraulic circuit when the water intake device is open;

[0025] Figure 6 FIG. is a schematic diagram of the hydraulic circuit when the water intake device is closed;

[0026] In the figure: water inlet pipe 1, water intake pipe 2, flange cover 3, flange plate 4, sealing strip 4-1, hydraulic cylinder 5, T-shaped piston rod 5-1, piston cylinder 5-2, oil inlet and outlet of the hydraulic cylinder opening chamber 5-3, oil inlet and outlet of the hydraulic cylinder closing chamber 5-4, hydraulic oil pipeline 6, pressure oil tank - reversing valve oil circuit 6-1, reversing valve - hydraulic cylinder opening chamber oil circuit 6-2, hydraulic cylinder closing chamber - reversing valve oil circuit 6-3, reversing valve - oil collecting tank oil circuit 6-4, pressure oil tank 7, oil collecting tank 8, reversing valve 9, speed measuring impeller 10, speed measuring impeller shaft 11, impeller shaft bearing 11-1, annular fixed bracket 11-2, speed measuring gear 12, transmission gear 13, transmission shaft 14, transmission shaft bearing 14-1, shaft seal device 14-2, rotational speed warning device 15, centrifugal block 15-1, reversing switch 15-2, mounting ring 15-3, guide block 15-4, counterweight block 15-5, reversing switch bracket 15-6, transmission rod 16. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. The objectives and effects of the present invention will become more apparent. It should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0028] As Figure 1 shown, the pre - warning and treatment system for flood - inundated powerhouse of the hydropower station in the embodiment of the present invention, which can also be called the water intake system of the hydropower station for preventing flood - inundated powerhouse, mainly improves the traditional water intake system of the hydropower station to achieve the function of preventing flood - inundated powerhouse. The pre - warning and treatment system for flood - inundated powerhouse of the hydropower station includes a nested water intake device, a hydraulic operation subsystem, and a flow velocity measurement and over - speed protection subsystem in the water intake pipe.

[0029] Among them, the nested water intake device includes an inlet pipe 1 and a water intake pipe 2 with slightly different outer diameters, one smaller and one larger and close to each other. The outer diameter of the inlet pipe 1 is slightly smaller than that of the water intake pipe 2, and the two are in a nested structure, that is, the inlet pipe 1 can make telescopic movement along the axial direction inside the water intake pipe 2. The end of the inlet pipe 1 is blocked by a flange cover 3, and the two are fixed by welding; the end of the water intake pipe 2 is provided with a flange plate 4, and the two are also fixed by welding, and the flange cover 3 and the flange plate 4 are of matching sizes.

[0030] As Figure 2 and Figure 3 shown, a number of openings are provided on the outer wall of the inlet pipe 1 for water intake. The number and size of the openings can be determined according to the water consumption of the electro - mechanical equipment in the power station. The openings on the outer wall of the inlet pipe 1 can not only intake water but also act as a trash rack to prevent large debris from entering the inlet pipe 1 and then entering the powerhouse along the water intake pipe 2 to damage the equipment. When the water intake is in the open state, the inlet pipe 1 extends outside the water intake pipe 2, and the openings on its outer wall are exposed to the reservoir, so that water can flow into the inlet pipe 1 and then enter the powerhouse along the water intake pipe 2 to be supplied to each water - using equipment; when the water intake is in the closed state, the inlet pipe 1 contracts inside the water intake pipe 2, and the openings on its outer wall are blocked by the outer wall of the water intake pipe 2, thus isolating the reservoir water from entering the inlet pipe 1.

[0031] A sealing strip 4 - 1 is provided inside the inner ring of the flange plate 4. When the water intake is in the closed state, the inlet pipe 1 contracts inside the water intake pipe 2, and the end flange cover 3 of the inlet pipe 1 fits with the flange plate 4 at the end of the water intake pipe 2. The sealing strip 4 - 1 can prevent water from flowing into the inlet pipe 1 along the gap between the flange cover 3 and the flange plate 4.

[0032] As Figure 1As shown in the figure, the hydraulic operation subsystem includes a hydraulic cylinder 5, a hydraulic oil pipeline 6, a pressure oil tank 7, an oil sump 8, a reversing valve 9, and a transmission rod 16. The pressure oil is discharged from the pressure oil tank 7, enters the hydraulic cylinder 5 through the hydraulic oil pipeline 6, and then returns to the oil sump 8. An oil pump is provided inside the oil sump 8 to pump the pressure oil back into the pressure oil tank 7. The reversing valve 9 is arranged on the hydraulic oil pipeline 6 and is used to switch the flow direction of the hydraulic oil in the hydraulic oil pipeline 6.

[0033] The hydraulic cylinder 5 includes a piston cylinder 5-1 and a T-shaped piston rod 5-2. The T-shaped piston rod 5-2 divides the piston cylinder 5-1 into upper and lower parts. The upper part is the opening chamber, and the lower part is the closing chamber. An opening chamber oil inlet / outlet 5-3 and a closing chamber oil inlet / outlet 5-4 are respectively arranged at the corresponding positions on the side of the piston cylinder 5-1 corresponding to the opening chamber and the closing chamber. A transmission rod 16 is provided between the end of the T-shaped piston rod 5-2 and the flange cover 3. One end of the transmission rod 16 is connected to the T-shaped piston rod 5-2 by flanges and bolts, and the other end is welded to the flange cover 3.

[0034] As Figure 1 shown in the figure, the reversing valve 9 divides the hydraulic oil pipeline 6 into four parts, namely: the pressure oil tank - reversing valve oil circuit 6-1, the reversing valve - hydraulic cylinder opening chamber oil circuit 6-2, the hydraulic cylinder closing chamber - reversing valve oil circuit 6-3, and the reversing valve - oil sump oil circuit 6-4.

[0035] As Figure 1 and Figure 4 shown in the figure, the water intake pipe flow velocity measurement and overspeed protection subsystem includes a speed measurement impeller 10, a speed measurement impeller shaft 11, a speed measurement gear 12, a transmission gear 13, a transmission shaft 14, and a speed warning device 15. The speed measurement impeller 10 and the speed measurement impeller shaft 11 are axially arranged in the water intake pipe 2. The transmission shaft 14 is arranged radially with respect to the water intake pipe 2 and passes through the water intake pipe. A bearing 11-1 and an annular fixing bracket 11-2 are provided in the middle of the speed measurement impeller shaft 11. The speed measurement impeller shaft 11 is supported in the water intake pipe 2 by the impeller shaft bearing 11-1 and the annular fixing bracket 11-2.

[0036] The speed measurement gear 12 is fixedly installed at the end of the speed measurement impeller shaft 11, the transmission gear 13 is fixedly installed at the bottom end of the transmission shaft 14, and the speed warning device 15 is fixedly installed at the top end of the transmission shaft 14. The speed measurement impeller 10 rotates under the action of water flow and drives the speed measurement impeller shaft 11 to rotate. Through the meshing of the speed measurement gear 12 and the transmission gear 13, this rotation is transmitted to the transmission shaft 14. A transmission shaft bearing 14-1 for supporting the transmission shaft 14 is also provided on the transmission shaft 14. A main shaft sealing device 14-2 is provided at the place where the transmission shaft 14 passes through the water intake pipe 2 to prevent the water flow in the water intake pipe 2 from leaking along the transmission shaft 14.

[0037] The rotational speed warning device 15 includes a centrifugal block 15-1, a reversing switch 15-2, a mounting ring 15-3, a guiding block 15-4, a counterweight 15-5, and a support frame 15-6. The mounting ring 15-3 is fixed to the transmission shaft 14. The guiding block 15-4 and the counterweight 15-5 are fixed on the opposite sides of the circumferential edge of the mounting ring 15-3 to prevent the transmission shaft 14 from being subjected to radial loads due to uneven weight distribution of the mounting ring 15-3, thereby affecting the accuracy of the overspeed protection device. The centrifugal block 15-1 is installed in the guiding block 15-4 through a spring. The reversing switch 15-2 is fixed to the support frame 15-6. The reversing switch 15-2 and the support frame 15-6 are arranged near the mounting ring 15-3, and there is a certain layout distance between the reversing switch 15-2 and the centrifugal block 15-1. The support frame 15-6 and the reversing valve 9 are of an integrated structure. Once the reversing switch 15-2 acts, the valve core of the reversing valve 9 can be pushed to move, thereby changing the internal passage oil circuit direction of the reversing valve 9.

[0038] In addition, the rotational speed warning device 15 has an alarm prompt function. That is, once the water intake pipe 2 leaks or bursts, resulting in an increase in flow rate and triggering the action of the rotational speed warning device 15, the voice alarm system will be immediately activated and will continuously broadcast "Danger of pipe burst, please evacuate as soon as possible!", thereby further ensuring the personal safety of the staff in the plant.

[0039] In the warning and treatment system for flooding of the hydropower station plant in this embodiment, the water inlet pipe 1, the flange cover 3, and the flange plate 4 are located below the dead water level of the reservoir; the hydraulic cylinder 5, the transmission rod 16, etc. are located on the platform of the reservoir gate well; the water intake pipe 2 extends from the water intake of the reservoir into the plant, and the rest of the equipment of the system is arranged in the hydropower station plant.

[0040] When the water intake system of the hydropower station is working normally, such as Figure 5As shown in the figure, in the hydraulic operating subsystem, the pressurized oil flows from the pressure oil tank 7 through the pressure oil tank - reversing valve oil path 6-1 and the hydraulic cylinder closing cavity - reversing valve oil path 6-3 into the oil inlet and outlet 5-4 of the hydraulic cylinder closing cavity, pushing the T-shaped piston rod 5-1 towards the hydraulic cylinder opening cavity. At this time, the return oil flows from the oil inlet and outlet 5-3 of the hydraulic cylinder opening cavity along the reversing valve - hydraulic cylinder opening cavity oil path 6-2 and the reversing valve - oil collecting tank oil path 6-4 back to the oil collecting tank 8. At the same time, the T-shaped piston rod 5-1 drives the transmission rod 16, the flange cover 3, and the water inlet pipe 1 to move upward. Then, the water inlet pipe 1 gradually extends out of the water intake pipe 2, exposing the outer wall openings. When the T-shaped piston rod 5-1 moves to the limit position, the outer wall openings of the water inlet pipe 1 just completely expose the outer wall of the water intake pipe 2. At this point, the water intake device can achieve normal water intake work, and the water flow is supplied to each water-using equipment in the plant along the water intake pipe 2. In a general hydropower station water intake system, the water flow velocity in the pipeline is designed at 2.5 m / s. When the water intake system is working normally, the speed measurement impeller 10 installed inside the water intake pipe 2 rotates under the impact of the water flow. At the same time, driven by the speed measurement impeller shaft 11, the speed measurement gear 12, and the transmission gear 13, the transmission shaft 14 also rotates at a normal speed. At this time, the centrifugal block 15-1 fixed on the transmission shaft 14 will not act, that is, the speed warning device 15 will not be triggered.

[0041] When there is leakage or pipe burst in the exposed part of the water intake pipe 2 or the first valve, and the isolation valve of the water intake pipe 2 cannot be closed to cut off the water flow, due to the sudden decrease in pressure, according to the law of conservation of energy, the water flow velocity inside the water intake pipe 2 will increase greatly. At this time, the rotation speed of the speed measurement impeller 10 will also increase, driving the speed measurement impeller shaft 11, the speed measurement gear 12, the transmission gear 13, and the transmission shaft 14 to rotate rapidly. When the rotation speed of the transmission shaft 14 reaches the preset rotation speed of the speed warning device 15, the length of the spring stretched by the centrifugal force on the centrifugal block 15-1 will be greater than the layout distance between the reversing switch 15-2 and the centrifugal block 15-1. At this time, the centrifugal block 15-1 will hit the reversing switch 15-2. After the reversing switch 15-2 acts, it will control the movement of the spool inside the reversing valve 9, thus changing the direction of the control oil path of the hydraulic operating system, as Figure 6As shown in the figure, at this time, the hydraulic oil flows out from the pressure oil tank 7, passes through the reversing valve 9, the first hydraulic oil pipeline 6-1 and the second hydraulic oil pipeline 6-2, enters the opening chamber of the hydraulic cylinder, and pushes the T-shaped piston rod 5-1 towards the closing chamber. The return oil flows out from the oil inlet and outlet 5-4 of the closing chamber of the hydraulic cylinder, passes through the third hydraulic oil pipeline 6-3, the fourth hydraulic oil pipeline 6-4 and the reversing valve 9, and returns to the oil collecting tank 8. When the T-shaped piston rod 5-1 moves towards the closing chamber of the hydraulic cylinder, it will drive the transmission rod 16, the flange cover 3 and the water inlet pipe 1 to move downward. At this time, the water inlet pipe 1 contracts towards the inside of the water intake pipe 2, and the outer wall openings thereof will gradually be blocked by the outer wall of the water intake pipe 2. When the T-shaped piston rod moves to the limit position, the water inlet pipe 1 is completely contracted inside the water intake pipe 2, and the water flow cannot flow into the water intake pipe 2 through the outer wall openings of the water inlet pipe 1, that is, the water intake device is closed. At this time, the flange cover 3 is tightly attached to the flange plate 4, and the sealing strip 4-1 inside the flange plate 4 will further prevent the water flow from entering the inside of the water intake pipe 2 along the gap. In addition, in order to prevent human misoperation, a mechanical locking device can be set on the T-shaped piston rod. After the water intake device is completely closed, the mechanical locking device on the T-shaped piston rod is manually operated to ensure that the water intake port will not be accidentally opened, thereby avoiding the occurrence of accidents such as flooding the plant.

[0042] Those of ordinary skill in the art can understand that the above are only preferred examples of the invention and are not used to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, for those skilled in the art, they can still modify the technical solutions described in the foregoing examples, or perform equivalent replacements for some of the technical features. All modifications, equivalent replacements, etc. made within the spirit and principle of the invention shall be included within the protection scope of the invention.

Claims

1. A warning and treatment system for a hydropower station flooded plant, characterized in that It includes a nested water intake device, a hydraulic operation subsystem, an in-take pipe flow velocity measurement and overspeed protection subsystem; The nested water intake device includes a water inlet pipe and a water intake pipe with a nested structure, and the water inlet pipe can perform telescopic movement along the axial direction inside the water intake pipe; The hydraulic operation subsystem includes a hydraulic cylinder, a hydraulic oil pipeline, a pressure oil tank, an oil sump tank, a reversing valve and a transmission rod; among them, the hydraulic cylinder includes a piston cylinder and a T-shaped piston rod, and the T-shaped piston rod is connected to the water inlet pipe through the transmission rod and can drive the water inlet pipe to move inside the water intake pipe; the pressure oil tank supplies oil to the piston cylinder through the hydraulic oil pipeline, and the discharged oil returns to the oil sump tank through the hydraulic oil pipeline; the reversing valve is installed on the hydraulic oil pipeline and is used to switch the oil flow direction; The in-take pipe flow velocity measurement and overspeed protection subsystem includes a speed measurement impeller, a speed measurement impeller shaft, a speed measurement gear, a transmission gear, a transmission shaft and a speed warning device; the speed measurement impeller shaft is supported inside the water intake pipe, the speed measurement impeller and the speed measurement gear are fixed on the speed measurement impeller shaft, the transmission gear is fixed at the bottom end of the transmission shaft, the speed measurement gear and the transmission gear are meshed, the top end of the transmission shaft extends out of the water intake pipe, and the speed warning device is fixed at the end of the transmission shaft extending out; the speed warning device is connected to the reversing valve and can control the action of the reversing valve to switch the oil flow direction entering the hydraulic cylinder.

2. The warning and treatment system for the flooded powerhouse of a hydropower station according to claim 1, characterized in that, The T-shaped piston rod divides the piston cylinder into an opening chamber and a closing chamber, and an opening chamber oil inlet / outlet and a closing chamber oil inlet / outlet are respectively provided at the corresponding positions on the side of the piston cylinder with the opening chamber and the closing chamber; the pressure oil discharged from the pressure oil tank enters the opening chamber or the closing chamber of the hydraulic cylinder through the hydraulic oil pipeline and returns to the oil sump tank through the hydraulic oil pipeline; the reversing valve is installed on the hydraulic oil pipeline and divides the hydraulic oil pipeline into a pressure oil tank - reversing valve oil pipeline, a reversing valve - hydraulic cylinder opening chamber oil pipeline, a hydraulic cylinder closing chamber - reversing valve oil pipeline, and a reversing valve - oil sump tank oil pipeline.

3. The warning and treatment system for the flooded powerhouse of a hydropower station according to claim 1, wherein A number of water intake holes are provided on the outer wall of the water inlet pipe; the end of the water inlet pipe is sealed with a flange cover, the end of the water intake pipe is provided with a flange plate, the flange cover and the flange plate are of matching sizes, and a sealing strip is provided inside the flange plate.

4. The warning and treatment system for flooded powerhouse of hydropower station according to claim 1, wherein The rotation speed warning device includes a centrifugal block, a reversing switch, a mounting ring, a guiding block, a counterweight, and a support frame; the mounting ring is fixed on the transmission shaft, the guiding block and the counterweight are fixed on the opposite sides of the circumferential edge of the mounting ring to prevent the transmission shaft from being subjected to radial loads due to uneven weight distribution of the mounting ring, thereby affecting the accuracy of the overspeed protection device; the centrifugal block is installed in the guiding block through a spring, the reversing switch is fixed on the support frame, the reversing switch and the support frame are arranged near the mounting ring, and there is a layout distance between the reversing switch and the centrifugal block; the support frame and the reversing valve are of an integrated structure. After the centrifugal block acts on the reversing switch, the reversing switch controls the movement of the spool of the reversing valve, thereby realizing the switching of the oil circuit of the opening chamber of the reversing valve - hydraulic cylinder and the oil circuit of the hydraulic cylinder closing chamber - reversing valve.

5. The hydropower station flooded powerhouse warning and handling system according to claim 1, wherein, An oil pump is provided inside the oil collecting tank for pumping the return oil in the oil collecting tank into the pressure oil tank to realize the recycling of hydraulic oil.

6. The warning and treatment system for flooded powerhouse of hydropower station according to claim 1, wherein A main shaft sealing device is provided at the place where the transmission shaft extends out of the water intake pipe to prevent the water flow in the water intake pipe from leaking along the transmission shaft.

7. The warning and treatment system for flood in a hydropower station plant according to claim 1, wherein The stroke limit of the T-shaped piston rod moving in the hydraulic cylinder corresponds to the full opening and closing of the nested water intake device.

8. The early warning and treatment system for flooded powerhouse of hydropower station according to claim 1, wherein The speed measuring impeller and the speed measuring impeller shaft are fixed in the water intake pipe through the impeller shaft bearing and the annular fixing bracket.

9. The hydropower station flood warning and treatment system according to claim 1, characterized in that, The hydraulic cylinder is provided with a mechanical locking device. When the T-shaped piston rod moves to the limit position of the closing chamber, the mechanical locking device is used to prevent the T-shaped piston rod from malfunctioning, thereby ensuring that the water intake is in the closed state.

10. The warning and treatment system for flooded powerhouse of hydropower station according to claim 1, wherein The rotation speed warning device has an attached voice alarm prompt function.

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