Auxiliary negative pressure system and method for pump set of water transfer system of large pump station

Abstract

The invention discloses an auxiliary negative pressure system and method for a pump set of a water transfer system of a large pump station, and belongs to the technical field of auxiliary water pumping equipment of pump stations for conveying water resources through pipelines. The negative pressure system comprises a water transfer pump set, an auxiliary negative pressure mechanism and a control mechanism, the water transfer pump set is used for pumping water from a water source with the water level lower than the inlet elevation of the water source, the auxiliary negative pressure mechanism is connected with the water transfer pump set and used for pumping and draining air in the water transfer pump set, and the control mechanism is electrically connected with the auxiliary negative pressure mechanism to control starting and stopping of the auxiliary negative pressure mechanism. The technical problem that water cannot be pumped due to the fact that the water taking level is lower than an inlet of a pump set can be effectively solved, meanwhile, the selection and design difficulty of a water pumping station is remarkably reduced, safe, stable and efficient operation of a water pumping system is promoted, the lake treatment efficiency can be improved, and social and economic development is promoted.

Description

Technical Field

[0001] This invention relates to an auxiliary negative pressure system and method for a pump set in a large-scale pumping station water transfer system, belonging to the technical field of auxiliary pumping equipment for pipeline water transport pumping stations. Background Technology

[0002] Pipeline transportation is an energy-saving, emission-reduction, and environmental protection project actively promoted by the state. It aligns with national sustainable development requirements, is supported by national industrial policies, and is a crucial measure for enterprises to improve economic efficiency and reduce costs. Utilizing long-distance pipelines to transport water allows lake water to circulate, enabling the rational allocation of water resources, ecological protection, and economic development.

[0003] At present, there are more and more large-scale water transmission and regulation system projects. In pipeline water transmission and regulation systems, especially in complex terrain, long distance, large diameter, large flow and high head water transmission and regulation systems, the selection of water pumping stations is quite difficult because, on the one hand, the water intake points are all in the fields of rivers, lakes and reservoirs, and the water intake water level is lower than the pumping station elevation; on the other hand, due to the process and characteristics of the water transmission and regulation system, the pumping stations are all located at the water source and water pool, and the elevation is higher than the water intake water level.

[0004] Chinese utility model patent application No. 202021845920.0 discloses a water intake and supply pumping station with a vacuum water intake device. Before water intake, the vacuum water intake device is activated. The vacuum pump draws in gas to generate negative pressure, which forces water from rivers where the liquid level is lower than that in the main inlet pipe into the main inlet pipe, filling the main inlet pipe with water. When the pressure sensor detects that the negative pressure reaches the set value, the vacuum water intake device is turned off, and the pump of the intelligent variable frequency constant pressure water supply equipment is turned on to complete the water extraction. This cycle is repeated, so that the water intake of this water supply pumping station can carry out water intake even if it is installed at a height higher than the water intake liquid level of the river / lake. This overcomes the limitations of terrain in some areas and avoids inconvenience in engineering applications. However, it still has shortcomings: First, the system reliability is insufficient, relying solely on electric ball valves for pipeline control and lacking a mechanical backup guarantee mechanism; second, maintenance convenience is lacking, requiring the entire system to be shut down during equipment maintenance, and lacking local isolation design; third, control accuracy is limited, relying solely on pressure sensors for single-parameter control; fourth, adaptability is insufficient, failing to consider the special needs of complex terrain and long-distance water transmission scenarios; and fifth, energy-saving effect is poor, failing to reflect equipment sharing and energy consumption optimization design. Summary of the Invention

[0005] (a) Technical problems to be solved The technical problem to be solved by the present invention is to solve the technical difficulty of pumping water in existing large-scale pumping station water transfer systems because the water source level is lower than the pump inlet elevation.

[0006] (II) Technical Solution To address the aforementioned technical problems, the present invention provides an auxiliary negative pressure system for a large-scale pumping station water transfer system, comprising a water transfer pump group, an auxiliary negative pressure mechanism, and a control mechanism. The water transfer pump group is used to pump water from a source where the water level is lower than its inlet elevation. The auxiliary negative pressure mechanism is connected to the water transfer pump group to pump out air from the water transfer pump group. The control mechanism is electrically connected to the auxiliary negative pressure mechanism to control its start and stop.

[0007] The water pump set includes a main pump, the auxiliary negative pressure mechanism includes a vacuum pump, a first inlet pipe and a first solenoid valve, and the control mechanism includes a field control box and a remote control center; the vacuum pump is connected to the main pump through the first inlet pipe, the first solenoid valve is installed on the first inlet pipe, the vacuum pump and the first solenoid valve are electrically connected to the field control box, and the field control box is communicatively connected to the remote control center.

[0008] The above system forms a complete pump station water regulation control system architecture through the coordinated configuration of water regulating pump sets, auxiliary negative pressure mechanisms and control mechanisms. It is specifically designed for the special working condition of "the water source level is lower than the inlet elevation", which solves the operational bottleneck of traditional pump stations in such scenarios. It constructs a three-level control system of "remote control center - field control box - actuator" to achieve centralized management and decentralized control.

[0009] Furthermore, the water pump set also includes a second inlet pipe, a first outlet pipe, a first check valve, an outlet working valve, and a second outlet pipe. The second inlet pipe and the first outlet pipe are respectively installed at the input and output ends of the main pump. The outlet working valve is installed on the first outlet pipe, and the second outlet pipe is installed at the output end of the outlet working valve. The first check valve is installed on the first outlet pipe between the outlet working valve and the main pump. The first check valve effectively prevents backflow of water and protects the main pump equipment.

[0010] Furthermore, the water pump assembly also includes an inlet pressure gauge and an outlet pressure gauge. The inlet pressure gauge is installed on the first outlet pipe between the first check valve and the main pump, and the outlet pressure gauge is installed on the second outlet pipe. The inlet and outlet pressure gauges form a complete pressure monitoring chain. Furthermore, the auxiliary negative pressure mechanism also includes a manual exhaust valve, a first manual ball valve, and a second manual ball valve. The first manual ball valve is located on the first water inlet pipe between the first solenoid valve and the main pump, and the second manual ball valve is located on the first water inlet pipe between the first solenoid valve and the vacuum pump. The vacuum pump is equipped with an exhaust pipe, and the manual exhaust valve is installed on the exhaust pipe. The configuration of the first and second manual ball valves provides dual mechanical isolation protection. In case of solenoid valve failure or system maintenance, safe isolation can be achieved through the manual ball valve; the manual exhaust valve facilitates the exhaust operation of the vacuum pump.

[0011] Furthermore, the auxiliary negative pressure mechanism also includes a filter and a second check valve. The filter is installed on the first water inlet pipe between the first solenoid valve and the first manual ball valve, and the second check valve is installed on the first water inlet pipe between the filter and the first manual ball valve. The filter effectively intercepts impurities, protecting precision components such as the vacuum pump and valves; the second check valve enhances the system's backflow prevention safety.

[0012] Furthermore, the auxiliary negative pressure mechanism also includes a vacuum gauge and a flow sensor. The vacuum gauge is installed on the first water inlet pipe between the second manual ball valve and the main pump, and the flow sensor is installed on the first water inlet pipe between the first solenoid valve and the second manual ball valve. The vacuum gauge displays the negative pressure status in real time, and the flow sensor monitors the medium flow rate, providing key real-time operating parameters for automatic control.

[0013] Furthermore, the auxiliary negative pressure mechanism also includes a gas-liquid separator, a third water outlet pipe, an automatic air vent valve, a level gauge, a drain pipe, a manual drain valve, and an overflow pipe. One end of the third water outlet pipe is connected to the output end of the vacuum pump, and the other end is connected to the input end of the gas-liquid separator. The gas-liquid separator is equipped with the automatic air vent valve, level gauge, drain pipe, and overflow pipe, and the drain pipe is equipped with the manual drain valve. A complete liquid discharge path is constructed through the drain pipe, overflow pipe, and manual drain valve.

[0014] Furthermore, the auxiliary negative pressure mechanism also includes a third water inlet pipe, a third manual ball valve, a second solenoid valve, and a fourth water inlet pipe. The third and fourth water inlet pipes are respectively installed on the gas-water separator and the vacuum pump, and are connected. The third manual ball valve is installed on the third water inlet pipe, and the second solenoid valve is installed on the fourth water inlet pipe. The third and fourth water inlet pipes establish an independent vacuum pump water injection circuit, and the second solenoid valve enables automated operation of the vacuum pump water injection.

[0015] Furthermore, the system includes multiple sets of water regulating pumps, each connected to the auxiliary negative pressure mechanism. Multiple sets of water regulating pumps share a single auxiliary negative pressure mechanism, significantly reducing equipment investment costs and providing a standardized interface and architecture for the large-scale expansion of large pumping stations.

[0016] On the other hand, based on the aforementioned auxiliary negative pressure system for large-scale pumping station water transfer systems, the present invention also provides a method for auxiliary negative pressure system for large-scale pumping station water transfer systems, which includes the following steps: S1. Before operation, check and ensure that the first manual ball valve is open, the second manual ball valve is open, the first solenoid valve is closed, the manual air vent valve is closed, the third manual ball valve is open, the second solenoid valve is closed, the manual drain valve is closed, and the gas-water separator is full of water with a normal liquid level. S2. The second solenoid valve is opened by the control mechanism to automatically inject water into the vacuum pump chamber, and then the first solenoid valve is opened. S3. Start the vacuum pump to pressurize and create negative pressure in the second water inlet pipe, the main pump and the first water outlet pipe, and draw the air in the second water inlet pipe, the main pump and the first water outlet pipe into the air-water separator for separation. S4. While the air in the second water inlet pipe, the main pump and the first water outlet pipe are purged, water is pumped from the water source level into the main pump and the first water outlet pipe through the second water inlet pipe. When the second water inlet pipe, the main pump and the first water outlet pipe are full of water, the water enters the air-water separator through the vacuum pump. When the water level in the air-water separator reaches the overflow pipe opening, it automatically overflows and is discharged into the drainage ditch through the overflow pipe and the drainage pipe. S5. When water passes through the flow sensor and the vacuum gauge pressure reaches the required pressure value, close the first solenoid valve and stop the vacuum pump. At this time, the conditions for starting the main pump are met. S6. Start the main pump to pressurize. When the pressure value of the pressure gauge before the valve is greater than the pressure value of the pressure gauge after the valve, open the outlet working valve to pressurize and lift water to the inlet pool of the next pumping station. At this time, the water adjustment pump group has been fully started. S7. When the production task is completed, first close the outlet working valve, then stop the main pump and stop operation.

[0017] The above method provides a complete standardized operation guide from preparation, startup, operation to shutdown. By pre-setting inspection items and step-by-step operation requirements, it ensures the safety of each operation link, clarifies the opening and closing sequence of each solenoid valve, realizes the automated control of system start-up and shutdown, and achieves accurate system status judgment and operation timing control through pressure value and flow monitoring.

[0018] (III) Beneficial Effects The above-described technical solution of the present invention has the following advantages: This invention is designed for use in water conveyance systems with complex terrain, long distances, large pipe diameters, high flow rates, and high head, particularly in scenarios where the inlet elevation of the pump unit in a water lifting system is higher than the source water level. It effectively solves the technical challenge of pumping water when the source water level is lower than the pump unit inlet elevation. Simultaneously, it significantly reduces the difficulty in selecting and designing pumping stations, contributing to the safe, stable, and efficient operation of the water conveyance system and playing a positive role in lake management and socio-economic development.

[0019] This invention can completely purge air from the pump station inlet pipe and pump chamber, promptly filling them with water. This significantly shortens the pump unit's start-up time, effectively ensuring normal pump unit startup and promoting the safe, stable, and efficient operation of the water transmission and distribution system, thereby improving the efficiency and economic benefits of water resource transportation. One auxiliary negative pressure mechanism can be used for multiple pump units, saving energy and reducing consumption, significantly lowering production, operating, and equipment maintenance costs. This invention also effectively enables remote centralized control, achieving excellent automatic control.

[0020] The technical solution of this invention constructs a comprehensive system of "automatic control + manual redundancy + multi-level monitoring", which ensures the automated operation of the system while providing sufficient maintenance convenience and emergency handling capabilities. It is particularly suitable for the long-term stable operation requirements of large water pumping stations under complex terrain conditions.

[0021] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted by the present invention, and the advantages brought about by the technical features of these technical solutions as described above, other technical features of the present invention and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the layout of the auxiliary negative pressure system of the pump group in the large-scale pumping station water transfer system of the present invention.

[0024] Figure 2 This is a schematic diagram of an auxiliary negative pressure mechanism shared by multiple sets of water pumps.

[0025] In the diagram: 1. Drainage pipe; 2. Overflow pipe; 3. Manual vent valve; 4. Gas-water separator; 5. Level gauge; 6. Third outlet pipe; 7. Third inlet pipe; 8. Third manual ball valve; 9. Second solenoid valve; 10. Fourth inlet pipe; 11. Vacuum pump; 12. Manual vent valve; 13. Vacuum gauge; 14. Second manual ball valve; 15. First inlet pipe; 16. Flow sensor; 17. First solenoid valve; 18. Filter; 19. Second check valve; 20. First manual ball valve; 21. Main pump; 22. Second inlet pipe; 23. Pressure gauge before valve; 24. First outlet pipe; 25. First check valve; 26. Outlet working valve; 27. Pressure gauge after valve; 28. Second outlet pipe; 29. ​​Automatic vent valve; 30. Field control box; 31. Remote control center. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] Example 1 like Figure 1As shown, a large-scale pumping station water transfer system includes a pumping unit auxiliary negative pressure system, comprising a water transfer pumping unit, an auxiliary negative pressure mechanism, and a control mechanism. The water transfer pumping unit is used to pump water from a source where the water level is lower than its inlet elevation. The auxiliary negative pressure mechanism is connected to the water transfer pumping unit to pump out air from within the pumping unit. The control mechanism is electrically connected to the auxiliary negative pressure mechanism to control its start and stop. More specifically, the water transfer pumping unit includes a main pump 21, the auxiliary negative pressure mechanism includes a vacuum pump 11, a first inlet pipe 15, and a first solenoid valve 17, and the control mechanism includes a field control box 30 (using existing technology) and a remote control center 31 (such as a computer or other control terminal, using existing technology). The vacuum pump 11 is connected to the main pump 21 through the first inlet pipe 15, and the first solenoid valve 17 is installed on the first inlet pipe 15. The vacuum pump 11 and the first solenoid valve 17 are electrically connected to the field control box 30, and the field control box 30 is communicatively connected to the remote control center 31.

[0029] like Figure 2 As shown, the auxiliary negative pressure system of the large pumping station water transfer system described in this embodiment may include multiple sets of water transfer pumps, and all sets of water transfer pumps are connected to the auxiliary negative pressure mechanism.

[0030] Example 2 This embodiment is a further optimization and refinement of the water regulating pump set structure based on Embodiment 1. In this embodiment, the water regulating pump set further includes a second inlet pipe 22, a first outlet pipe 24, a first check valve 25, an outlet working valve 26, and a second outlet pipe 28. The input end and output end of the main pump 21 are respectively provided with the second inlet pipe 22 and the first outlet pipe 24. The outlet working valve 26 is provided on the first outlet pipe 24, and the output end of the outlet working valve 26 is provided with the second outlet pipe 28. The first check valve 25 is provided on the first outlet pipe 24 between the outlet working valve 26 and the main pump 21.

[0031] More specifically, the water pump set also includes a pressure gauge 23 before the valve and a pressure gauge 27 after the valve. The pressure gauge 23 before the valve is installed on the first water outlet pipe 24 between the first check valve 25 and the main pump 21, and the pressure gauge 27 after the valve is installed on the second water outlet pipe 28. Example 3 This embodiment is a further optimization and refinement of the auxiliary negative pressure mechanism based on Embodiment 2. In this embodiment, the auxiliary negative pressure mechanism further includes a manual exhaust valve 12, a first manual ball valve 20, and a second manual ball valve 14. The first manual ball valve 20 is disposed on the first water inlet pipe 15 between the first solenoid valve 17 and the main pump 21. The second manual ball valve 14 is disposed on the first water inlet pipe 15 between the first solenoid valve 17 and the vacuum pump 11. The vacuum pump 11 is provided with an exhaust pipe, and the manual exhaust valve 12 is disposed on the exhaust pipe. The auxiliary negative pressure mechanism also includes a filter 18 and a second check valve 19. The filter 18 is disposed on the first water inlet pipe 15 between the first solenoid valve 17 and the first manual ball valve 20, and the second check valve 19 is disposed on the first water inlet pipe 15 between the filter 18 and the first manual ball valve 20.

[0032] More specifically, the auxiliary negative pressure mechanism also includes a vacuum gauge 13 and a flow sensor 16. The vacuum gauge 13 is installed on the first water inlet pipe 15 between the second manual ball valve 14 and the main pump 21, and the flow sensor 16 is installed on the first water inlet pipe 15 between the first solenoid valve 17 and the second manual ball valve 14. The auxiliary negative pressure mechanism also includes a gas-water separator 4, a third water outlet pipe 6, an automatic air vent valve 29, a level gauge 5, a drain pipe 1, a manual drain valve 3, and an overflow pipe 2. One end of the third water outlet pipe 6 is connected to the output end of the vacuum pump 11, and the other end is connected to the input end of the gas-water separator 4. The automatic air vent valve 29, the level gauge 5, the drain pipe 1, and the overflow pipe 2 are installed on the gas-water separator 4, and the manual drain valve 3 is installed on the drain pipe 1.

[0033] In this embodiment, the auxiliary negative pressure mechanism further includes a third water inlet pipe 7, a third manual ball valve 8, a second solenoid valve 9, and a fourth water inlet pipe 10. The third water inlet pipe 7 and the fourth water inlet pipe 10 are respectively installed on the gas-water separator 4 and the vacuum pump 11. The third water inlet pipe 7 and the fourth water inlet pipe 10 are connected. The third manual ball valve 8 is installed on the third water inlet pipe 7, and the second solenoid valve 9 is installed on the fourth water inlet pipe 10.

[0034] Example 4 This embodiment discloses a method for auxiliary negative pressure of pump sets in a large-scale pumping station water transfer system. It employs the auxiliary negative pressure system for pump sets in a large-scale pumping station water transfer system described in the above embodiment, and includes the following steps: 4.1 Pre-operation checks and preparations: 4.1.1 First, check that the first manual ball valve 20 and the second manual ball valve 14 are in the open position, the second check valve 19 is in good working condition, and the filter 18 has been cleaned and maintained and is in good condition. 4.1.2 After completing step 4.1.1, check whether the power supply to the first solenoid valve 17 is normal and whether it is in the closed state, and whether the power supply to the pressure sensor and flow sensor 16 of the vacuum gauge 13 is normal. 4.1.3 After completing step 4.1.2, check that the manual exhaust valve 12 is in the closed state, the third manual ball valve 8 is in the open state, and the second solenoid valve 9 is powered normally and is in the closed state. 4.1.4 After completing step 4.1.3, check if the power supply to vacuum pump 11 is normal; 4.1.5 After completing step 4.1.4, check that the manual vent valve 3 is in the closed position; 4.1.6 After step 4.1.5, check whether the gas-liquid separator 4 is full of water and whether the liquid level is normal; 4.1.7 After completing step 4.1.6, check whether the automatic exhaust valve 29 is working properly; 4.1.8 After completing step 4.1.7, check that the field control box 30 and the remote control center 31 are in normal condition; 4.1.9 After completing step 4.1.8, check whether the pressure gauge 23 before the valve, the first check valve 25, and the pressure gauge 27 after the valve are normal, and check whether the power supply to the outlet working valve 26 is normal.

[0035] 4.2 Operation Control: 4.2.1 On-site control: 4.2.1.1 At the field control box 30, open the second solenoid valve 9 to automatically inject water into the pump chamber of vacuum pump 11. When vacuum pump 11 is running, it is used for circulation. Then open the first solenoid valve 17. 4.2.1.2 At the field control box 30, start the vacuum pump 11 to pressurize and create negative pressure in the second water inlet pipe 22, the main pump 21, and the first water outlet pipe 24. The air in the second water inlet pipe 22, the main pump 21, and the first water outlet pipe 24 is then pumped out through the first water inlet pipe 15 and the third water outlet pipe 6 to the air-water separator 4 for separation. 4.2.1.3 When the air in the second inlet pipe 22, the main pump 21, and the first outlet pipe 24 is purged, water is pumped from the water source level into the main pump 21 and the first outlet pipe 24 through the second inlet pipe 22. When the second inlet pipe 22, the main pump 21, and the first outlet pipe 24 are full of water, the water enters the vacuum pump 11 through the first manual ball valve 20, the second check valve 19, the filter 18, the first solenoid valve 17, the flow sensor 16, the second manual ball valve 14, and the vacuum gauge 13 via the first inlet pipe 15. After passing through the third outlet pipe 6, the water enters the air-water separator 4. When the water level in the air-water separator 4 reaches the overflow pipe 2, it automatically overflows and is discharged into the drainage ditch through the overflow pipe 2 and the drainage pipe 1. 4.2.1.4 When the water passes through the flow sensor 16 and the pressure value of the vacuum gauge 13 reaches the required pressure value, close the first solenoid valve 17 and press the stop button of the vacuum pump 11 at the field control box 30. At this time, the second water inlet pipe 22, the main pump 21 and the first water outlet pipe 24 are filled with water, and the conditions for starting the main pump 21 are met. 4.2.1.5 Start the main pump 21 to pressurize. When the pressure value of the pressure gauge 23 before the valve is greater than the pressure value of the pressure gauge 27 after the valve, open the outlet working valve 26. At this time, the water flows through the first outlet pipe 24 and the second outlet pipe 28, pressurized and pumped to the water inlet pool of the next stage pumping station. At this time, the start-up of the main pump 21 pump set is completed. 4.2.1.6 When the production task is completed and it is necessary to stop the main pump 21, first close the outlet working valve 26. After the outlet working valve 26 is completely closed, press the main pump 21 stop button to stop the operation.

[0036] 4.2.2 Remote Control Process: 4.2.4.1 Before remote control operation, check that the field control box 30 is in the remote position, the outlet working valve 26 and the main pump 21 control cabinet are in the remote position; 4.2.4.2 Check whether the main pump 21 meets the starting conditions on the control panel of the remote control center 31. If the starting conditions are met, the pump can be started. 4.2.4.3 When a one-button start command is issued on the operating console of the remote control center 31, the field control box 30 will automatically open the second solenoid valve 9 to automatically inject water into the pump chamber of the vacuum pump 11 after receiving the command. When the vacuum pump 11 is running, it will be used for circulation and the first solenoid valve 17 will be automatically opened. 4.2.4.2 Start the vacuum pump 11 to pressurize and create negative pressure in the second water inlet pipe 22, the main pump 21, and the first water outlet pipe 24. The air in the second water inlet pipe 22, the main pump 21, and the first water outlet pipe 24 is drawn out through the first water inlet pipe 15 and the third water outlet pipe 6 and then separated in the air-water separator 4. 4.2.4.5. When the air in the second inlet pipe 22, the main pump 21, and the first outlet pipe 24 is purged, water is pumped from the water level in the pool into the main pump 21 and the first outlet pipe 24 through the second inlet pipe 22. When the second inlet pipe 22, the main pump 21, and the first outlet pipe 24 are full of water, the water enters the vacuum pump 11 through the first inlet pipe 15, passing through the first manual ball valve 20, the second check valve 19, the filter 18, the first solenoid valve 17, the flow sensor 16, the second manual ball valve 14, and the vacuum gauge 13. After passing through the third outlet pipe 6, the water enters the air-water separator 4. When the water level in the air-water separator 4 reaches the overflow pipe 2, it automatically overflows and is discharged into the drainage ditch through the overflow pipe 2 and the drainage pipe 1. 4.2.4.6 When water passes through the flow sensor 16 and the pressure value of the vacuum gauge 13 reaches the required pressure value, the first solenoid valve 17 is automatically closed and the vacuum pump 11 is automatically stopped. At this time, the second water inlet pipe 22, the main pump 21, and the first water outlet pipe 24 are filled with water, and the conditions for starting the main pump 21 are met. 4.2.4.7 Automatically start the main pump 21 to pressurize. When the pressure value of the pressure gauge 23 before the valve is greater than the pressure value of the pressure gauge 27 after the valve, the outlet working valve 26 is automatically opened. At this time, the water is pressurized and pumped to the water inlet pool of the next stage pumping station through the first water outlet pipe 24 and the second water outlet pipe 28. At this time, the automatic start of the main pump 21 pump set is completed. 4.2.4.8 When the production task is completed and it is necessary to stop the main pump 21, a one-button stop command is issued on the operating console of the remote control center 31. After receiving the closing command, the outlet working valve 26 automatically closes. When the outlet working valve 26 is 100% closed, the main pump 21 is automatically stopped, and the remote automatic control is completed.

[0037] 4.3 Sharing method for multiple pumping stations (water transfer pump sets): See Figure 2 As shown, the auxiliary negative pressure mechanism of pump group 1 is connected to pump groups 2 and 3, or even more pump groups, ultimately resulting in... Figure 2 The multiple water regulating pump sets shown are connected to the auxiliary negative pressure mechanism. The preparation before operation and the start-up and shutdown control methods are the same as in 4.1 and 4.2. The operation of the water regulating pump sets is arranged according to production needs.

[0038] In the description of the invention, unless otherwise stated, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An auxiliary negative pressure system for pump sets in a large-scale pumping station water transfer system, characterized in that: It includes a water regulating pump set, an auxiliary negative pressure mechanism, and a control mechanism. The water regulating pump set is used to pump water from a water source where the water level is lower than its inlet elevation. The auxiliary negative pressure mechanism is connected to the water regulating pump set to pump out air from the water regulating pump set. The control mechanism is electrically connected to the auxiliary negative pressure mechanism to control its start and stop. The water pump set includes a main pump (21), the auxiliary negative pressure mechanism includes a vacuum pump (11), a first water inlet pipe (15) and a first solenoid valve (17), and the control mechanism includes a field control box (30) and a remote control center (31); the vacuum pump (11) is connected to the main pump (21) through the first water inlet pipe (15), the first solenoid valve (17) is installed on the first water inlet pipe (15), the vacuum pump (11) and the first solenoid valve (17) are electrically connected to the field control box (30), and the field control box (30) is communicatively connected to the remote control center (31).

2. The auxiliary negative pressure system for pump sets in a large-scale pumping station water transfer system according to claim 1, characterized in that: The water pump set also includes a second inlet pipe (22), a first outlet pipe (24), a first check valve (25), an outlet working valve (26), and a second outlet pipe (28). The input end and output end of the main pump (21) are respectively provided with the second inlet pipe (22) and the first outlet pipe (24). The outlet working valve (26) is provided on the first outlet pipe (24). The output end of the outlet working valve (26) is provided with the second outlet pipe (28). The first check valve (25) is provided on the first outlet pipe (24) between the outlet working valve (26) and the main pump (21).

3. The auxiliary negative pressure system for pump sets in a large-scale pumping station water transfer system according to claim 2, characterized in that: The water pump set also includes a pressure gauge (23) before the valve and a pressure gauge (27) after the valve. The pressure gauge (23) before the valve is installed on the first outlet pipe (24) between the first check valve (25) and the main pump (21), and the pressure gauge (27) after the valve is installed on the second outlet pipe (28).

4. The auxiliary negative pressure system for pump sets in a large-scale pumping station water transfer system according to any one of claims 1-3, characterized in that: The auxiliary negative pressure mechanism also includes a manual exhaust valve (12), a first manual ball valve (20), and a second manual ball valve (14). The first manual ball valve (20) is located on the first water inlet pipe (15) between the first solenoid valve (17) and the main pump (21). The second manual ball valve (14) is located on the first water inlet pipe (15) between the first solenoid valve (17) and the vacuum pump (11). The vacuum pump (11) is provided with an exhaust pipe, and the manual exhaust valve (12) is provided on the exhaust pipe.

5. The auxiliary negative pressure system for the pump set of the large-scale pumping station water transfer system according to claim 4, characterized in that: The auxiliary negative pressure mechanism also includes a filter (18) and a second check valve (19). The filter (18) is installed on the first water inlet pipe (15) between the first solenoid valve (17) and the first manual ball valve (20), and the second check valve (19) is installed on the first water inlet pipe (15) between the filter (18) and the first manual ball valve (20).

6. The auxiliary negative pressure system for the pump set of the large-scale pumping station water transfer system according to claim 5, characterized in that: The auxiliary negative pressure mechanism also includes a vacuum gauge (13) and a flow sensor (16). The vacuum gauge (13) is installed on the first water inlet pipe (15) between the second manual ball valve (14) and the main pump (21), and the flow sensor (16) is installed on the first water inlet pipe (15) between the first solenoid valve (17) and the second manual ball valve (14).

7. The auxiliary negative pressure system for pump sets in a large-scale pumping station water transfer system according to claim 6, characterized in that: The auxiliary negative pressure mechanism also includes a gas-water separator (4), a third water outlet pipe (6), an automatic air vent valve (29), a level gauge (5), a drainage pipe (1), a manual drain valve (3), and an overflow pipe (2); one end of the third water outlet pipe (6) is connected to the output end of the vacuum pump (11), and the other end is connected to the input end of the gas-water separator (4). The gas-water separator (4) is equipped with the automatic air vent valve (29), the level gauge (5), the drainage pipe (1), and the overflow pipe (2). The drainage pipe (1) is equipped with the manual drain valve (3).

8. The auxiliary negative pressure system for the pump set of the large-scale pumping station water transfer system according to claim 7, characterized in that: The auxiliary negative pressure mechanism also includes a third water inlet pipe (7), a third manual ball valve (8), a second solenoid valve (9), and a fourth water inlet pipe (10). The third water inlet pipe (7) and the fourth water inlet pipe (10) are respectively installed on the gas-water separator (4) and the vacuum pump (11). The third water inlet pipe (7) and the fourth water inlet pipe (10) are connected. The third manual ball valve (8) is installed on the third water inlet pipe (7), and the second solenoid valve (9) is installed on the fourth water inlet pipe (10).

9. The auxiliary negative pressure system for the pump set of the large-scale pumping station water transfer system according to claim 8, characterized in that: It includes multiple sets of water regulating pumps, all of which are connected to the auxiliary negative pressure mechanism.

10. A method for auxiliary negative pressure in a pump set of a large pumping station water transfer system, characterized in that: The auxiliary negative pressure system for the pump set of the large pumping station water transfer system as described in claim 9 includes the following steps: S1. Before operation, check and ensure that the first manual ball valve (20) is open, the second manual ball valve (14) is open, the first solenoid valve (17) is closed, the manual exhaust valve (12) is closed, the third manual ball valve (8) is open, the second solenoid valve (9) is closed, the manual drain valve (3) is closed, and the gas-water separator (4) is filled with water and the liquid level is normal. S2. The second solenoid valve (9) is opened through the control mechanism to automatically inject water into the pump chamber of the vacuum pump (11), and then the first solenoid valve (17) is opened. S3. Start the vacuum pump (11) to pressurize and generate negative pressure in the second water inlet pipe (22), the main pump (21) and the first water outlet pipe (24), and draw the air in the second water inlet pipe (22), the main pump (21) and the first water outlet pipe (24) into the air-water separator (4) for separation. S4. While the air in the second water inlet pipe (22), the main pump (21) and the first water outlet pipe (24) are purged, water is pumped from the water source level into the main pump (21) and the first water outlet pipe (24) through the second water inlet pipe (22). When the second water inlet pipe (22), the main pump (21) and the first water outlet pipe (24) are filled with water, the water enters the air-water separator (4) through the vacuum pump (11). When the water level in the air-water separator (4) reaches the overflow pipe (2) opening, it automatically overflows and is discharged to the drainage ditch through the overflow pipe (2) and the drainage pipe (1). S5. When water passes through the flow sensor (16) and the pressure value of the vacuum gauge (13) reaches the required pressure value, the first solenoid valve (17) is closed and the vacuum pump (11) is stopped. At this time, the conditions for starting the main pump (21) are met. S6. Start the main pump (21) to pressurize. When the pressure value of the pressure gauge (23) before the valve is greater than the pressure value of the pressure gauge (27) after the valve, open the outlet working valve (26) to pressurize and lift water to the inlet pool of the next pumping station. At this time, the water adjustment pump group has been fully started. S7. When the production task is completed, first close the outlet working valve (26), then stop the main pump (21) and stop operation.

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