Maintenance and drainage system for diversion tunnel of hydropower station

Abstract

The utility model discloses a hydropower station diversion tunnel maintenance drainage system in the technical field of water conservancy and hydropower engineering, which comprises a diversion tunnel body, one side of the diversion tunnel body is connected with a diversion branch pipe, one end of the diversion branch pipe far away from a water intake is connected with a tail water channel, and a tail water gate is arranged in the tail water channel. A water taking opening is formed in the end, close to the diversion tunnel body, of the diversion branch pipe, a water drainage opening is formed in the bottom of the tail water channel, and a water drainage assembly is arranged between the water taking opening and the water drainage opening. When the water level in the diversion tunnel body is higher than the tail water level, self-flowing drainage is achieved through the communicating pipe, energy consumption is reduced, when the water level in the diversion tunnel body is lower than the tail water level, pumping drainage is achieved through the main drainage pump, and meanwhile leaked water and seepage water in the diversion tunnel body are drained through the auxiliary drainage pump; according to the system, various drainage paths are arranged according to different working conditions in the diversion tunnel body, so that the drainage efficiency of the system is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of water conservancy and hydropower engineering, and in particular to a maintenance and drainage system for a hydropower station's water diversion tunnel. Background Technology

[0002] A hydropower station consists of a hydraulic system, a mechanical system, and power generation devices. It is a key water conservancy project that converts water energy into electrical energy. The sustainability of power generation requires the uninterrupted utilization of water energy in hydropower stations. During the construction of a hydropower station, the water diversion tunnel, as one of the hydraulic structures, refers to the water passage used for power generation (pumping) from the inlet (outlet) of the upper reservoir to the inlet valve section of the generating unit. During excavation and construction, it is often necessary to drain the sewage in the tunnel pit to prevent water accumulation from affecting construction.

[0003] To meet the suction height requirements of the generating units, the installation elevation of the generating units in run-of-river and pumped-storage power stations is usually lower than the tailrace level. This necessitates the installation of an additional drainage system during maintenance and venting of the run-of-river tunnel. Currently, most power stations with one pipe and one or two generating units typically do not have separate drainage systems for their run-of-river tunnels; they usually share the system with the generating units' maintenance drainage system. However, in tunnel configurations with multiple generating units, sharing the system with the generating units' maintenance drainage system can lead to difficulties in selecting pump parameters. In actual operation, this may result in low drainage efficiency, prolonged drainage time, and in severe cases, impact the maintenance schedule. Utility Model Content

[0004] In order to improve the existing tunnel configuration of multiple units in one pipe mentioned above, which may lead to difficulties in selecting water pump parameters when combined with the unit maintenance drainage system, and may result in low drainage efficiency, long time consumption, and in severe cases, affect the maintenance schedule, this utility model provides a maintenance drainage system for a hydropower station water diversion tunnel.

[0005] This utility model provides a maintenance and drainage system for a hydropower station's water diversion tunnel, employing the following technical solution:

[0006] A maintenance and drainage system for a hydropower station's water diversion tunnel includes a water diversion tunnel body, a water diversion branch pipe connected to one side of the water diversion tunnel body, a tailrace channel connected to the end of the water diversion branch pipe away from the water intake, a tailrace gate installed inside the tailrace channel, a water intake port installed at the bottom of the water diversion branch pipe near the water diversion tunnel body, a drain outlet installed at the bottom of the tailrace channel, and a drainage assembly installed between the water intake port and the drain outlet.

[0007] The drainage assembly includes a main drainage pump, an auxiliary drainage pump, and a connecting pipe. The input end of the main drainage pump is connected to a first water intake branch pipe, and the output end of the main drainage pump is connected to a first drainage branch pipe. The input end of the auxiliary drainage pump is connected to a second water intake branch pipe, and the output end of the auxiliary drainage pump is connected to a second drainage branch pipe. The water intake is connected to the first water intake branch pipe, the second water intake branch pipe, and the connecting pipe through a main water intake pipe. The drainage outlet is connected to the first drainage branch pipe, the second drainage branch pipe, and the connecting pipe through a main drainage pipe.

[0008] By adopting the above technical solution, when the water level inside the water diversion tunnel is higher than the tailrace level, the water inside the water diversion tunnel will enter the water intake main pipe through the intake port under the action of gravity, and then flow by gravity to the tailrace channel through the connecting pipe. When the water level inside the water diversion tunnel is the same as the tailrace level, the main drainage pump is started, and the water enters the first water intake branch pipe through the water intake main pipe, and is discharged through the first drainage branch pipe and the drainage main pipe, thereby pumping out the remaining water in the water diversion tunnel. When the water in the water diversion tunnel is pumped out or nearly pumped out, the auxiliary drainage pump is turned on. At this time, the water enters the second water intake branch pipe through the water intake main pipe, and is discharged through the second drainage branch pipe and the drainage main pipe, thereby pumping out the leakage and seepage in the water diversion tunnel. The system sets up multiple drainage paths according to different working conditions inside the water diversion tunnel, thereby improving the drainage efficiency of the system.

[0009] Optionally, a first isolation valve is provided on the first water intake branch pipe, and a second isolation valve is provided on the second water intake branch pipe.

[0010] By adopting the above technical solution, the water flow rate inside the first water intake branch pipe can be controlled according to the actual situation by setting the first isolation valve, and the water flow rate inside the second water intake branch pipe can be controlled according to the actual situation by setting the second isolation valve.

[0011] Optionally, a first check valve is provided on the first drainage branch pipe, and a second check valve is provided on the second drainage branch pipe.

[0012] By adopting the above technical solution, the first check valve prevents water in the first drainage branch pipe from flowing back into the main drainage pump, which could cause the main drainage pump to run dry or be damaged. The second check valve prevents water in the second drainage branch pipe from flowing back into the auxiliary drainage pump, which could also cause the auxiliary drainage pump to run dry or be damaged. This protects the safe operation of the main drainage pump, the auxiliary drainage pump, the first drainage branch pipe, and the second drainage branch pipe.

[0013] Optionally, a third check valve may be provided on the connecting pipe.

[0014] By adopting the above technical solution and setting a third check valve, backflow of water in the connecting pipe can be effectively prevented.

[0015] Optionally, a third isolation valve is installed on the main water intake pipe.

[0016] By adopting the above technical solution and setting the third isolation valve, the water intake main pipe can be opened or closed.

[0017] Optionally, a fourth isolation valve is provided on the main drain pipe.

[0018] By adopting the above technical solution and setting the fourth isolation valve, the main drain pipe can be opened or closed.

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

[0020] When the water level inside the water diversion tunnel is higher than the tailwater level, the water is drained by gravity through the connecting pipe to reduce energy consumption. When the water level inside the water diversion tunnel is lower than the tailwater level, the water is pumped out by the main drainage pump. At the same time, the auxiliary drainage pump is used to remove leakage and seepage inside the water diversion tunnel. The system is equipped with multiple drainage paths according to different working conditions inside the water diversion tunnel, thereby improving the drainage efficiency of the system. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0023] In the diagram: 1. First intake branch pipe; 101. First isolation valve; 2. Main drainage pump; 3. First drainage branch pipe; 301. First check valve; 4. Second intake branch pipe; 401. Second isolation valve; 5. Auxiliary drainage pump; 6. Second drainage branch pipe; 601. Second check valve; 7. Connecting pipe; 701. Third check valve; 8. Main intake pipe; 801. Third isolation valve; 9. Main drainage pipe; 901. Fourth isolation valve; 10. Water diversion tunnel; 11. Water diversion branch pipe; 12. Water intake; 13. Tailrace channel; 14. Drainage outlet; 15. Tailrace level; 16. Tailrace gate. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1 The present invention will be described in further detail below.

[0025] Please refer to the attached diagram in the instruction manual. Figure 1 This utility model provides an embodiment of a drainage system for the maintenance of a hydropower station's water diversion tunnel. The system includes a water diversion tunnel body 10, a water diversion branch pipe 11 connected to one side of the tunnel body 10, a tailrace channel 13 connected to the end of the branch pipe 11 furthest from the intake 12, a tailrace gate 16 installed inside the tailrace channel 13, an intake 12 located at the bottom of the branch pipe 11 near the tunnel body 10, and a drain outlet 14 located at the bottom of the tailrace channel 13. A drainage assembly is installed between the intake 12 and the drain outlet 14. The drainage assembly includes a main drainage pump 2, an auxiliary drainage pump 5, and a connecting pipe 7. A third check valve 701 is installed on the connecting pipe 7. The third check valve 701 effectively prevents backflow of water within the connecting pipe 7.

[0026] Please refer to the attached diagram in the instruction manual. Figure 1 The input end of the main drainage pump 2 is connected to the first water intake branch pipe 1, and the output end of the main drainage pump 2 is connected to the first drainage branch pipe 3. The input end of the auxiliary drainage pump 5 is connected to the second water intake branch pipe 4. A first isolation valve 101 is installed on the first water intake branch pipe 1, and a second isolation valve 401 is installed on the second water intake branch pipe 4. By setting the first isolation valve 101, the water flow rate inside the first water intake branch pipe 1 can be controlled according to the actual situation. By setting the second isolation valve 401, the water flow rate inside the second water intake branch pipe 4 can be controlled according to the actual situation.

[0027] Please refer to the attached diagram in the instruction manual. Figure 1 The output end of the auxiliary drainage pump 5 is connected to a second drainage branch pipe 6. A first check valve 301 is installed on the first drainage branch pipe 3, and a second check valve 601 is installed on the second drainage branch pipe 6. The first check valve 301 prevents water in the first drainage branch pipe 3 from flowing back into the main drainage pump 2, which could cause the main drainage pump 2 to run dry or be damaged. The second check valve 601 prevents water in the second drainage branch pipe 6 from flowing back into the auxiliary drainage pump 5, which could also cause the auxiliary drainage pump 5 to run dry or be damaged. This protects the safe operation of the main drainage pump 2, the auxiliary drainage pump 5, the first drainage branch pipe 3, and the second drainage branch pipe 6.

[0028] Please refer to the attached diagram in the instruction manual. Figure 1 Water intake 12 is connected to the first water intake branch pipe 1, the second water intake branch pipe 4, and the connecting pipe 7 via the main water intake pipe 8. A third isolation valve 801 is installed on the main water intake pipe 8. The third isolation valve 801 allows the main water intake pipe 8 to be opened or closed. Drainage outlet 14 is connected to the first drainage branch pipe 3, the second drainage branch pipe 6, and the connecting pipe 7 via the main drainage pipe 9. A fourth isolation valve 901 is installed on the main drainage pipe 9. The fourth isolation valve 901 allows the main drainage pipe 9 to be opened or closed.

[0029] Working principle: When the water level in the main body 10 of the water diversion tunnel is higher than the tailwater level 15, the third check valve 701, the third isolation valve 801 and the fourth isolation valve 901 are opened first. The first isolation valve 101, the main drainage pump 2, the first check valve 301, the second isolation valve 401, the auxiliary drainage pump 5 and the second check valve 601 are all closed. At this time, the water in the main body 10 of the water diversion tunnel will enter the interior of the water intake main pipe 8 through the water intake port 12 under the action of gravity, and then flow to the tailwater channel 13 by gravity through the connecting pipe 7 and the drainage main pipe 9.

[0030] When the water level inside the main body 10 of the water diversion tunnel is the same as the tailwater level 15, the first isolation valve 101 is opened and the main drainage pump 2 is started. Water enters the interior of the first water intake branch pipe 1 through the water intake main pipe 8 and is discharged through the first drainage branch pipe 3 and the drainage main pipe 9, thereby enabling the pumping out of the remaining water in the main body 10 of the water diversion tunnel.

[0031] When the water in the main body 10 of the water diversion tunnel is pumped out or nearly pumped out, the first isolation valve 101 and the main drainage pump 2 are closed, and the second isolation valve 401 and the auxiliary drainage pump 5 are opened. At this time, the water enters the interior of the second water intake branch pipe 4 through the water intake main pipe 8, and is discharged through the second drainage branch pipe 6 and the drainage main pipe 9, thereby pumping out the leakage and seepage in the main body 10 of the water diversion tunnel. The system sets up multiple drainage paths according to different working conditions in the main body 10 of the water diversion tunnel, thereby improving the drainage efficiency of the system.

[0032] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A maintenance and drainage system for a hydropower station's water diversion tunnel, comprising a water diversion tunnel body (10), a water diversion branch pipe (11) connected to one side of the water diversion tunnel body (10), a tailrace channel (13) connected to the end of the water diversion branch pipe (11) away from the water intake (12), and a tailrace gate (16) provided inside the tailrace channel (13), characterized in that: A water intake (12) is provided at the bottom of the water diversion branch pipe (11) near the end of the water diversion tunnel body (10), and a drain outlet (14) is provided at the bottom of the tailrace channel (13). A drainage component is provided between the water intake (12) and the drain outlet (14). The drainage assembly includes a main drainage pump (2), an auxiliary drainage pump (5), and a connecting pipe (7). The input end of the main drainage pump (2) is connected to a first water intake branch pipe (1), and the output end of the main drainage pump (2) is connected to a first drainage branch pipe (3). The input end of the auxiliary drainage pump (5) is connected to a second water intake branch pipe (4), and the output end of the auxiliary drainage pump (5) is connected to a second drainage branch pipe (6). The water intake port (12) is connected to the first water intake branch pipe (1), the second water intake branch pipe (4), and the connecting pipe (7) through the water intake main pipe (8). The drain outlet (14) is connected to the first drainage branch pipe (3), the second drainage branch pipe (6), and the connecting pipe (7) through the drainage main pipe (9).

2. The maintenance and drainage system for a hydropower station water diversion tunnel according to claim 1, characterized in that: A first isolation valve (101) is installed on the first water intake branch pipe (1), and a second isolation valve (401) is installed on the second water intake branch pipe (4).

3. The maintenance and drainage system for a hydropower station water diversion tunnel according to claim 1, characterized in that: A first check valve (301) is provided on the first drainage branch pipe (3), and a second check valve (601) is provided on the second drainage branch pipe (6).

4. The maintenance and drainage system for a hydropower station water diversion tunnel according to claim 1, characterized in that: A third check valve (701) is provided on the connecting pipe (7).

5. A maintenance and drainage system for a hydropower station water diversion tunnel according to claim 1, characterized in that: A third isolation valve (801) is installed on the main water intake pipe (8).

6. A maintenance and drainage system for a hydropower station water diversion tunnel according to claim 1, characterized in that: A fourth isolation valve (901) is installed on the main drainage pipe (9).

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