A maintenance and drainage structure for a hydropower station underground powerhouse

Abstract

The utility model provides a kind of water and electricity station underground powerhouse overhauling drainage structure, it is related to water and electricity station underground powerhouse overhauling technical field, and it includes: main water collector, the main water collector outside is scattered and distributed with vice water collecting pit, the main water collector inside is provided with and is distributed with first deep well type main drainage pump and second deep well type main drainage pump, the vice water collecting pit inside is provided with small submersible sewage pump, the main water collector and vice water collecting pit inside distribution are equipped with liquid level transmitter, water level sensor, the main water collector side well wall is laid and is communicated with drainage main pipe, the drainage main pipe pipe face is connected with drainage branch pipe, the other end of the drainage branch pipe is connected with vice water collecting pit and is communicated with.The utility model solves the problem that the existing water and electricity station underground powerhouse usually has only one water collector, once drainage capacity saturation or pump failure occurs, the entire drainage system will face the risk of paralysis.

Description

Technical Field

[0001] This utility model relates to the field of maintenance technology for underground powerhouses of hydropower stations, specifically to a drainage structure for maintenance of underground powerhouses of hydropower stations. Background Technology

[0002] The underground powerhouse of a hydroelectric power station is the core hub of the hydroelectric system, housing critical equipment such as turbine generators, main transformers, governors, and oil, gas, and water systems. To ensure operational safety, the powerhouse is typically located below the groundwater level, making waterproofing and drainage design crucial. The maintenance drainage system is primarily used to remove water from the spiral casing, tailrace pipe, pressure pipes, and any leaks into the powerhouse during unit or water pipeline maintenance. However, existing hydroelectric power station underground powerhouses usually only have one sump. If the drainage capacity becomes saturated or a pump fails, the entire drainage system risks being paralyzed. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, a maintenance drainage structure for underground powerhouses in hydropower stations is provided. This structure addresses the problem that existing underground powerhouses in hydropower stations typically have only one sump, which can lead to the paralysis of the entire drainage system if the drainage capacity becomes saturated or the pumps fail.

[0004] To achieve the above objectives, a maintenance drainage structure for an underground powerhouse of a hydropower station is provided, comprising: a main sump, with secondary sump pits distributed around the outside of the main sump. The main sump is equipped with a first deep-well main drainage pump and a second deep-well main drainage pump. The auxiliary sump is equipped with a small submersible sewage pump. Liquid level transmitters and water level sensors are distributed inside the main sump and the auxiliary sump. A main drainage pipe is laid on the side wall of the main sump and connected to it. A branch drainage pipe is connected to the main drainage pipe, and the other end of the branch drainage pipe is connected to the auxiliary sump.

[0005] Furthermore, the first deep-well main drainage pump and the second deep-well main drainage pump are staggered from bottom to top within the main water collection well.

[0006] Furthermore, the upper ends of both the first deep-well main drainage pump and the second deep-well main drainage pump are connected to the external drainage structure through water outlet pipes.

[0007] Furthermore, an electric check valve is installed on the surface of the water outlet pipe.

[0008] Furthermore, the side end of the small submersible sewage pump is connected to the external drainage structure via a sewage pipe.

[0009] Furthermore, a ring-shaped trash rack is installed at the opening of the main water collection well and the secondary water collection pit.

[0010] Furthermore, the level transmitter and water level sensor are electrically connected to a PLC controller, which is installed in a cabinet on the wall of the factory.

[0011] Furthermore, audible and visual alarms are installed on both sides of the PLC controller cabinet.

[0012] The beneficial effects of this utility model are as follows: the maintenance drainage structure of the underground powerhouse of the hydropower station utilizes a multi-stage diversion drainage structure consisting of a main sump and an auxiliary sump. This allows the main drainage pipe and branch pipes to divert some of the water accumulated in the main sump to the auxiliary sump. Simultaneous drainage is achieved through two sets of deep-well main drainage pumps in the main sump and a small submersible sewage pump in the auxiliary sump. This facilitates timely removal of water from the underground powerhouse, greatly reduces the burden on the main sump, and makes it easier to handle situations where a single drainage pump fails or the drainage capacity becomes saturated. This effectively avoids the risk of flooding the powerhouse, ensures the stable operation of the maintenance drainage system of the underground powerhouse, and improves the drainage effect of the maintenance drainage structure. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the layout of the maintenance and drainage structure of the underground powerhouse of a hydropower station, according to an embodiment of this utility model.

[0014] Figure 2 This is a cross-sectional structural diagram of the main water collection well according to an embodiment of the present utility model.

[0015] Figure 3 This is a partial structural diagram of the drainage main pipe according to an embodiment of the present utility model.

[0016] Figure 4 This is a schematic diagram of the drainage control system according to an embodiment of the present invention.

[0017] In the diagram: 1. Main sump; 11. First deep well main drainage pump; 12. Second deep well main drainage pump; 13. Electric check valve; 14. Outlet pipe; 15. Level transmitter; 2. Secondary sump; 21. Small submersible sewage pump; 22. Water level sensor; 23. Sewage pipe; 3. Main drainage pipe; 31. Branch drainage pipe; 4. PLC controller; 41. Audible and visual alarm; 5. Trash rack. Detailed Implementation

[0018] Reference Figures 1 to 4 As shown, this utility model provides a maintenance drainage structure for an underground powerhouse of a hydropower station, including: a main sump 1, and auxiliary sump pits 2 distributed around the outside of the main sump 1. The main sump 1 is equipped with a first deep well main drainage pump 11 and a second deep well main drainage pump 12. The auxiliary sump 2 is equipped with a small submersible sewage pump 21. The main sump 1 and the auxiliary sump 2 are equipped with a level transmitter 15 and a water level sensor 22. The main sump 1 is connected to a drainage main pipe 3 by laying a drainage main pipe 3 on its side wall. The drainage main pipe 3 is connected to a drainage branch pipe 31, and the other end of the drainage branch pipe 31 is connected to the auxiliary sump 2.

[0019] When the level transmitter 15 detects that the water level in the main collection well 1 in the underground powerhouse of the hydropower station has risen to the first water level line (this water level line is the auxiliary water level line), Figure 2 When the water level reaches the lowest dotted line (as indicated by the bottom dotted line), the PLC controller 4 starts the first deep-well main drainage pump 11, causing it to pump the water accumulated in the main collection well 1 through the outlet pipe 14 to the external drainage structure. When the water accumulation rate exceeds the speed of the first deep-well main drainage pump 11, the water level continuously rises to the first water level line (this water level line is the auxiliary water level line). Figure 2 When the water level reaches the middle and upper dotted line, some of the accumulated water is diverted to multiple auxiliary sump pits 2 through the main drainage pipe 3 and the branch drainage pipe 31 for diversion. When the water level in the auxiliary sump pit 2 reaches the preset value, the small submersible sewage pump 21 is started to pump the water in the pit to the drainage structure outside the plant, realizing multi-stage diversion drainage of the water in the underground powerhouse of the hydropower station. When the water level continues to rise, the second deep well main drainage pump 12 is also pneumatically pumped to facilitate the timely removal of the water in the underground powerhouse of the hydropower station, greatly reducing the burden on the main sump pit and making it easier to deal with the situation of single drainage pump failure or drainage capacity saturation.

[0020] In this embodiment, the first deep-well main drainage pump 11 and the second deep-well main drainage pump 12 are staggered from bottom to top within the main sump 1. The upper ends of both the first deep-well main drainage pump 11 and the second deep-well main drainage pump 12 are connected to the external drainage structure via outlet pipes 14. An electric check valve 13 is installed on the surface of the outlet pipe 14. The side end of the small submersible sewage pump 21 is connected to the external drainage structure via a sewage pipe 23. Ring-shaped trash racks 5 are installed at the openings of the main sump 1 and the auxiliary sump 2.

[0021] As a preferred implementation, the two sets of first deep-well main drainage pumps 11 and second deep-well main drainage pumps 12 in the main sump 1 (an additional set of drainage pumps can be installed as a backup, depending on the actual situation) are used to prevent the drainage pumps from failing. The outlet pipes 14 of the first deep-well main drainage pumps 11 and second deep-well main drainage pumps 12 are led out through the side wall of the powerhouse to the external drainage structure or recycling system. The ring-shaped trash rack 5 is detachable, effectively intercepting large debris and facilitating removal for cleaning, reducing maintenance intensity. The electric check valve 13 is used to prevent backflow of water in the pipes. The auxiliary sump 2 can be distributed in other rooms of the underground powerhouse of the hydroelectric power station.

[0022] In this embodiment, the level transmitter 15 and the water level sensor 22 are electrically connected to a PLC controller 4, which is installed in a cabinet on the wall of the factory. Audible and visual alarms 41 are installed on both sides of the PLC controller 4 cabinet.

[0023] In a preferred implementation, the PLC controller 4 is a Siemens S7-1200 PLC controller, which controls the start and stop of the drainage pump in the main sump 1, the signal from the level transmitter 15, and the opening and closing of the electric check valve 13. The signals from the level sensors 22 of each auxiliary sump 2 are also sent to the PLC controller 4, enabling the controller 4 to independently control the start and stop of each small submersible sewage pump 21. Simultaneously, it controls the audible and visual alarm 41 to trigger an alarm signal and remotely transmits the alarm signal to the monitoring terminal, promptly alerting maintenance personnel to any malfunctions. The trigger condition for the audible and visual alarm 41 is that after the level transmitter 15 detects that the water level in the main sump 1 has reached the upper dotted line and continues to rise, the level transmitter 15 sends the current water level signal to the PLC controller 4, triggering the alarm signal.

[0024] This utility model of a drainage structure for maintenance of underground powerhouses in hydropower stations effectively solves the problem that existing underground powerhouses in hydropower stations typically only have one sump, which can lead to the paralysis of the entire drainage system if the drainage capacity becomes saturated or the pump fails. It facilitates the timely removal of accumulated water in the underground powerhouse, greatly reduces the burden on the main sump, and makes it easier to deal with situations where a single drainage pump fails or the drainage capacity becomes saturated. It effectively avoids the risk of flooding the powerhouse, improves the drainage effect of the drainage structure for maintenance of underground powerhouses in hydropower stations, and is applicable to the maintenance drainage structure of underground powerhouses in hydropower stations.

Claims

1. A maintenance drainage structure for an underground powerhouse of a hydropower station, comprising: The main water collection well (1) has secondary water collection pits (2) distributed around its outer side. Its characteristic is that: The main collection well (1) is equipped with a first deep well main drainage pump (11) and a second deep well main drainage pump (12). The auxiliary collection pit (2) is equipped with a small submersible sewage pump (21). The main collection well (1) and the auxiliary collection pit (2) are equipped with a liquid level transmitter (15) and a water level sensor (22). The main collection well (1) is connected to a drainage main pipe (3) on its side wall. The drainage main pipe (3) is connected to a drainage branch pipe (31). The other end of the drainage branch pipe (31) is connected to the auxiliary collection pit (2).

2. The maintenance drainage structure for an underground powerhouse of a hydropower station according to claim 1, characterized in that, The first deep well main drainage pump (11) and the second deep well main drainage pump (12) in the main water collection well (1) are staggered from bottom to top.

3. The maintenance drainage structure for an underground powerhouse of a hydropower station according to claim 1, characterized in that, The upper ends of the first deep well main drainage pump (11) and the second deep well main drainage pump (12) are connected to the external drainage structure through the water outlet pipe (14).

4. The maintenance drainage structure for an underground powerhouse of a hydropower station according to claim 3, characterized in that, An electric check valve (13) is installed on the surface of the water outlet pipe (14).

5. The maintenance drainage structure for an underground powerhouse of a hydropower station according to claim 1, characterized in that, The small submersible sewage pump (21) is connected to the external drainage structure via a sewage pipe (23) at one end.

6. The maintenance drainage structure for an underground powerhouse of a hydropower station according to claim 1, characterized in that, The main collection well (1) and the secondary collection pit (2) are equipped with ring-shaped trash racks (5) at their openings.

7. The maintenance drainage structure for an underground powerhouse of a hydropower station according to claim 1, characterized in that, The level transmitter (15) and the water level sensor (22) are electrically connected to a PLC controller (4), which is installed in a cabinet on the wall of the factory.

8. The maintenance drainage structure for an underground powerhouse of a hydropower station according to claim 7, characterized in that, The PLC controller (4) cabinet is equipped with audible and visual alarms (41) on both sides.

Images