Leakage draining pump lubricating water self-lubricating system

Abstract

The utility model provides a lubricating water self-lubricating system of a leakage drainage pump, relates to the field of leakage drainage of hydropower stations, and solves the problem that an existing leakage drainage system depends on an external lubricating water source. The system comprises a leakage water-collecting well and leakage drainage pumps, water inlet pipes of the leakage drainage pumps extend into the bottom of the leakage water-collecting well, and the leakage drainage pumps are correspondingly connected with leakage drainage pipes. The lubricating water tank is connected with the leakage draining pump through a lubricating water conveying pipe, and the lubricating water tank is further connected with an external lubricating water pipe; a lubricating water output electric valve is arranged on the lubricating water conveying pipe, and a liquid level annunciator is further arranged at the position of the leakage water collecting well; the PLC is respectively in communication connection with the leakage drainage pump, the lubricating water output electric valve and the liquid level annunciator; the lubricating requirement of the leakage drainage pump is met in a self-water-supply mode, and the service life of the leakage drainage pump is prolonged while the stability of the leakage drainage pump is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of leakage drainage of hydropower stations and is applied to the lubrication process of drainage pumps. Specifically, it relates to a self-lubricating system and method for lubricating water of a leakage drainage pump. Background Art

[0002] In modern power production, the safe and stable operation of power stations is the key to ensuring energy supply. Among them, the leakage drainage pump is one of the key auxiliary equipment of the power station. Its function is to timely drain the accumulated water generated inside the equipment and the surrounding environment during the operation of the generator set, preventing equipment damage and potential safety hazards. However, before starting, the existing leakage drainage pumps need to provide lubricating water through an external water source to ensure the lubrication between the pump shaft and the bearing, avoid dry grinding, thereby protecting the pump body from damage and extending its service life.

[0003] Although this design principle can effectively protect the leakage drainage pump in theory, in actual application, it faces a severe challenge, that is, the stability of the external water source. Due to the influence of various factors on the external water source, such as natural condition changes and human interference, the continuity of its water supply is difficult to be fully guaranteed. Once the water supply is interrupted, the following consequences will directly occur: lacking necessary lubricating water, the leakage drainage pump will not be able to start normally, affecting the normal operation of the power station; starting forcibly without lubricating water will cause dry grinding between the pump shaft and the bearing bracket, aggravating mechanical wear and shortening the service life of the drainage pump; the failure of the drainage pump may lead to the inability to timely drain the accumulated water inside the power station, increasing the risk of equipment failure and even triggering safety accidents.

[0004] Even if some leakage drainage pumps are submersible pumps, which are designed to work underwater and are actually submerged in the sump, it is still necessary to introduce lubricating water before starting because there is not enough water as a lubricant in specific areas inside the pump body, and the above-mentioned dry grinding problems may still exist at the moment of starting. The impact pressure fluctuation during the starting process may affect the sealing effect of the pump body and the connecting pipes, resulting in the entry and retention of gas or impurities. These phenomena need to be solved by pre-introducing lubricating water. In addition, the leakage drainage pumps in hydropower stations are generally set as non-submersible ground pumps for the balance of cost and life. They drain water by extending the inlet pipe to the bottom of the leakage sump. In this case, the pre-introduction of lubricating water is even more important.

[0005] It can be seen that the above problems not only increase the operation cost of the power station but also pose a serious threat to the safe and stable operation of the equipment. Therefore, seeking a technical solution that can reduce the dependence on external water sources and ensure the stable starting and operation of the leakage drainage pump has become an urgent need in the current operation and maintenance management of power stations. Summary of the Utility Model

[0006] Based on the current situation in the background technology, the purpose of the present utility model is to solve the problem of the dependence of the existing leakage drainage system on external lubricating water sources. Therefore, a self-lubricating system and method for the lubricating water of a leakage drainage pump are proposed. The present utility model uses an automatically controlled lubricating water tank as the standby water source for the lubricating water of the leakage drainage pump. When the external water source is cut off or completely absent / cancelled, the lubricating water demand of the leakage drainage pump is met through a self-supplying water method, thereby improving the service life of the leakage drainage pump while ensuring the stability of the leakage drainage system.

[0007] The present utility model adopts the following technical solutions to achieve the purpose:

[0008] A self-lubricating system for the lubricating water of a leakage drainage pump includes a leakage sump and multiple leakage drainage pumps. The inlet pipe of each leakage drainage pump extends to the bottom of the leakage sump. Each leakage drainage pump is correspondingly connected to a leakage drainage pipe. The leakage drainage pump is used to pump the seepage water in the leakage sump and discharge it through the leakage drainage pipe. It also includes a lubricating water tank and a PLC controller. The lubricating water tank is respectively connected to each leakage drainage pump through a lubricating water delivery pipe, and the lubricating water tank is also connected to an external lubricating water pipe. A lubricating water output electric valve is provided on the lubricating water delivery pipe, and a liquid level signaler for detecting the liquid level of the seepage water in the leakage sump is also provided at the leakage sump. The PLC controller is communicatively connected to each leakage drainage pump, the lubricating water output electric valve, and the liquid level signaler respectively.

[0009] Further, the lubricating water delivery pipe includes a main pipe section close to the lubricating water tank side and a branch pipe section corresponding to each leakage drainage pump. A manual normally open valve is provided on the main pipe section, and another manual normally open valve, a lubricating water output electric valve, and an insertion type flowmeter are sequentially provided on each branch pipe section starting from the main pipe section side. The PLC controller is communicatively connected to the insertion type flowmeter, and the insertion type flowmeter is used to feedback the on-off flow signal of the lubricating water to the PLC controller.

[0010] Further, the leakage drainage pipe is also connected to the lubricating water tank through a lubricating water circulation pipe. On the lubricating water circulation pipe, a normally open manual valve, a one-way valve, and a lubricating water circulation electric valve are sequentially provided starting from the leakage drainage pipe side. A liquid level signaler for detecting the liquid level of the lubricating water in the lubricating water tank is also provided at the lubricating water tank. The PLC controller is communicatively connected to the lubricating water circulation electric valve and all liquid level signalers.

[0011] In summary, due to the adoption of the present technical solution, the beneficial effects of the present utility model are as follows:

[0012] The utility model introduces an automatically controlled lubricating water tank as a backup lubricating water source to ensure that even in the case of interruption of the external water source, necessary lubricating water can still be continuously provided for the leakage drainage pump, greatly enhancing the overall stability and risk resistance of the system. Through the self-water supply method, the dry grinding phenomenon caused by the interruption of the external water source is almost completely eliminated, effectively reducing the wear between the pump shaft and the bearing bracket, thus significantly extending the service life of the leakage drainage pump and reducing the maintenance cost.

[0013] The implementation of the self-lubricating system simplifies the start-up preparation process of the drainage pump, is no longer limited by the availability of the external water source, and improves the operation efficiency and convenience. In the case of no external water source supply, the system can operate in self-circulation, using the pre-stored lubricating water for internal circulation to ensure the lubrication and cooling inside the pump body, and can maintain the normal functioning of the equipment even under extreme conditions. By recycling the lubricating water, the demand for the external water source is reduced, not only reducing the water resource consumption, but also helping to reduce the impact on the environment, reflecting the concept of green energy conservation. Brief Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the self-lubricating system for the lubricating water of the leakage drainage pump of the utility model.

[0015] The meanings represented by the marks in the drawings are specifically as follows:

[0016] 1 - normally open manual valve, 2 - check valve, 3 - lubricating water circulation electric valve, 4 - standby manual valve, 5 - automatic water filter, 6 - liquid level signaler, 7 - lubricating water tank, 8 - lubricating water output electric valve, 9 - insertion type flowmeter, 10 - leakage drainage pump, 11 - leakage drainage pipe, 12 - water hammer absorber, 13 - PLC controller, 14 - vacuum pressure gauge, 15 - leakage sump, 16 - leakage overflow pipe, 17 - combined exhaust valve. Detailed Implementation Modes

[0017] To make the objectives, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are some but not all of the embodiments of the utility model. Usually, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Accordingly, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0019] Embodiment

[0020] As Figure 1 shown in the structure and connection relationship, it is a self-lubricating system for the lubricating water of a leakage drainage pump. The system includes a leakage sump 15 and multiple leakage drainage pumps 10. The inlet pipe of each leakage drainage pump 10 extends into the bottom of the leakage sump 15. Each leakage drainage pump 10 is correspondingly connected to a leakage drainage pipe 11. The leakage drainage pump 10 is used to pump the seepage water in the leakage sump 15 and discharge it through the leakage drainage pipe 11. In this embodiment, four leakage drainage pumps 10 are used in the system.

[0021] The system further includes a lubricating water tank 7 and a PLC controller 13; the lubricating water tank 7 is respectively connected to each leakage drainage pump 10 through a lubricating water delivery pipe, and the lubricating water tank 7 is also connected to an external lubricating water pipe; a lubricating water output electric valve 8 is arranged on the lubricating water delivery pipe, and a liquid level signaler 6 for detecting the liquid level of the seepage water in the leakage sump is also arranged at the leakage sump 15; the PLC controller 13 is respectively communicatively connected to each leakage drainage pump 10, the lubricating water output electric valve 8 and the liquid level signaler 6.

[0022] As Figure 1 shown, the liquid level signaler 6 arranged at the leakage sump 15 is divided into two groups in this embodiment. One group is a float type liquid level switch, which is communicatively connected to the PLC controller 13; the other group is a submersible pressure transmitter, which is communicatively connected to the public LCU, that is, the local control system, for real-time display of the water level of the seepage water in the leakage sump 15.

[0023] As Figure 1 shown, on the leakage drainage pipe 11 correspondingly connected to each leakage drainage pump 10, a combined exhaust valve 17, a vacuum pressure gauge 14, a check valve 2 and a normally open manual valve 1 are sequentially arranged starting from the leakage drainage pump 10. The combined exhaust valve 17 is used to discharge the air in the leakage drainage pump 10 and the pipeline under the action of lubricating water, so as to ensure smooth water flow, reduce air resistance and water hammer effect. The vacuum pressure gauge 14 monitors the internal pressure at the outlet end of the leakage drainage pump 10, which can be positive pressure type or negative pressure type, so as to assist in judging whether the leakage drainage system is working properly. The check valve 2 prevents the reverse flow of water and protects the leakage drainage pump 10 and other equipment from backflow damage. The normally open manual valve 1 is used as an isolation valve and can be manually closed by personnel in case of maintenance or emergency to cut off the water flow.

[0024] When the system of this embodiment is initially put into operation, the lubricating water tank 7 is communicated with the external lubricating water pipe through a connecting pipe; on the connecting pipe, an external lubricating water control valve, a check valve 2, a normally open manual valve 1, a vacuum pressure gauge 14 and another normally open manual valve 1 are sequentially arranged starting from the external lubricating water pipe end. Based on the lubricating water self-circulation scheme of the lubricating water tank 7 to be introduced later, the above-mentioned external water source related devices can no longer be used after the system operates normally; or when the lubricating water self-circulation scheme is not adopted, the above-mentioned external water source related devices can be retained, and the lubricating water tank 7 can also maintain a large-capacity lubricating water storage under normal conditions to meet the requirements of production operation.

[0025] As Figure 1 shown, the lubricating water delivery pipe includes a main pipe section close to the lubricating water tank 7 and branch pipe sections corresponding to each leakage drainage pump 10; a normally open manual valve 1 is arranged on the main pipe section, and another normally open manual valve 1, a lubricating water output electric valve 8 and an insertion type flowmeter 9 are sequentially arranged starting from the main pipe section side on each branch pipe section; the PLC controller 13 is communicatively connected to the insertion type flowmeter 9, and the insertion type flowmeter 9 is used to feedback the lubricating water on-off flow signal to the PLC controller 13.

[0026] Meanwhile, both ends of the lubricating water output electric valve 8 are also communicated through a bypass pipe, and a standby manual valve 4 for manual control is arranged on the bypass pipe. The design of the standby manual valve 4 can realize related functions such as lubricating water supply in a manual manner when the corresponding electric valve is abnormal or there is an electrical control failure, so as to maintain the overall operation of the entire large leakage drainage system.

[0027] In this embodiment, water hammer absorbers 12 are arranged on the main pipe section and any branch pipe section. A water hammer absorber is a device specifically designed to reduce or eliminate the impact of water hammer phenomenon on the pipeline system. Water hammer is a situation in a closed pipeline system where, due to the sudden stop or direction change of the fluid, such as the rapid closing of a valve or the start and stop of a pump, the kinetic energy of the fluid is converted into pressure energy, generating an instantaneous high-pressure pulse in the pipeline. In this embodiment, it is reflected as the opening and closing of the lubricating water output electric valve 8; this instantaneous high-pressure pulse can generate great stress on the pipeline and related equipment, thereby causing damage. Therefore, protection is required through the water hammer absorbers 12. The water hammer absorbers 12 can adopt existing structures or devices, such as usually a chamber containing compressed gas, etc., which will not be elaborated here in this embodiment.

[0028] The following is an introduction to the lubricating water self-circulation scheme, as Figure 1As shown, the leakage drain pipe 11 is also connected to the lubricating water tank 7 through the lubricating water circulation pipe; on the lubricating water circulation pipe, a normally open manual valve 1, a check valve 2, and a lubricating water circulation electric valve 3 are sequentially arranged starting from the side of the leakage drain pipe 11; a liquid level signaler 6 for detecting the liquid level of the lubricating water in the lubricating water tank 7 is also arranged at the lubricating water tank 7, and the PLC controller 13 is communicatively connected to the lubricating water circulation electric valve 3 and all liquid level signalers 6.

[0029] In this embodiment, both ends of the lubricating water circulation electric valve 3 are also connected through a bypass pipe, and a standby manual valve 4 for manual control is arranged on the bypass pipe; an automatic water filter 5 is also arranged on the connecting pipe between the lubricating water circulation electric valve 3 and the lubricating water tank 7; an exhaust pipe is connected above the lubricating water tank 7, and a standby manual valve 4 for exhausting is also arranged on the exhaust pipe; a drain pipe is connected below the lubricating water tank 7, and a standby manual valve 4 for draining is also arranged on the drain pipe. The automatic water filter 5 can filter out the impurities that may be contained in the seepage water entering the leakage sump 15 in the form of leakage here, turning it into relatively clean lubricating water, so as to maintain the appropriate cleanliness of the lubricating water tank 7 and ensure the effect of the lubricating water. The exhaust pipe is usually kept unobstructed so that there is no air pressure resistance when the lubricating water is replenished; the drain pipe is manually opened as needed to adjust the amount of lubricating water in the lubricating water tank or for cleaning.

[0030] Through the leakage drainage pump lubricating water self-lubrication system of this embodiment, it assists the normal production operation of the leakage drainage system and provides a stable and reliable lubricating water source for it, thus solving the problem of easy lack of external water sources in the traditional solution, realizing the high efficiency, safety, and sustainability of the operation of related equipment, and having important practical significance and broad market application prospects for improving the overall operation and maintenance level of the hydropower station.

[0031] Based on the leakage drainage pump lubricating water self-lubrication system of this embodiment as the hardware foundation, the working principle of the self-lubrication method that can be realized is introduced as follows, and the schematic diagram of the system can be referred to synchronously Figure 1 For the schematic diagram of the system, the self-lubrication method includes the following steps:

[0032] S1. Divide the four leakage drainage pumps 10 into working pumps and standby pumps, and divide the water level of the seepage water in the leakage sump 15 into a pump stop water level, a working pump start water level, a standby pump start water level, and an alarm water level in ascending order; in this embodiment, the preferred division method for the four leakage drainage pumps is 2 working pumps plus 2 standby pumps;

[0033] S2. The PLC controller 13 obtains the water level of the seepage water in the leakage sump through the liquid level signaler 6 at the leakage sump 15. When the water level of the seepage water reaches the working pump start water level, the PLC controller 13 turns on the lubricating water output electric valve 8 corresponding to the working pump;

[0034] After the lubricating water output electric valve 8 is opened, the PLC controller 13 obtains the on-off flow signal of the lubricating water through the insertion type flowmeter 9 additionally arranged on the lubricating water delivery pipe, and at the same time, the timer inside the PLC controller 13 starts timing;

[0035] S4. When the timing reaches the preset lubricating water input duration, the PLC controller 13 turns on the leakage drainage pump 10 classified as the working pump, closes the lubricating water output electric valve 8 at the same time, and resets the timing; the leakage water in the leakage sump 15 is pumped by the working pump and discharged through the leakage drainage pipe 11; in this embodiment, the lubricating water input duration is preferably three minutes;

[0036] S5. When the leakage drainage pump 10 classified as the working pump is turned on, the PLC controller 13 starts timing again after resetting the timing;

[0037] S6. When the timing restarted reaches the preset drainage working duration, or the water level of the leakage water continues to rise and reaches the standby pump start water level when the working pump is already running, the PLC controller 13 turns on the lubricating water output electric valve 8 corresponding to the standby pump, and then turns on the leakage drainage pump 10 classified as the standby pump in the same way; the drainage working duration can be set as needed according to the specific performance parameters of the leakage drainage pump 10;

[0038] S7. If the standby pump is turned on because the timing reaches the preset drainage working duration, jump to step S8; if the standby pump is turned on because the water level of the leakage water continues to rise and reaches the standby pump start water level when the working pump is already running, jump to step S9;

[0039] S8. After the standby pump is turned on, the PLC controller 13 turns off the working pump and resets the timing, and cycles the self-lubrication and start-stop of the working pump and the standby pump in the same way until the water level of the leakage water is lower than the pump stop water level, then turns off the running leakage drainage pump 10, completes the discharge of the leakage water in the leakage sump 15, and waits for the next leakage water drainage operation;

[0040] S9. The standby pump and the working pump are turned on at the same time, the PLC controller 13 resets the timing, until the water level of the leakage water is lower than the pump stop water level, then turns off all the leakage drainage pumps 10, completes the discharge of the leakage water in the leakage sump 15, and waits for the next leakage water drainage operation.

[0041] In addition, in combination with the water level division in the leakage sump 15, in this embodiment, a leakage overflow pipe 16 is additionally connected to the leakage sump at a level higher than the alarm water level as an emergency safeguard measure. This enables, even after all the leakage drainage pumps 10 are operating, when the water level of the leakage water continues to rise and exceeds the alarm water level, while the PLC controller 13 issues an alarm, the leakage water can be additionally diverted through the leakage overflow pipe 16 to an emergency treatment point, which may be another leakage sump 15 with additional flow handling capacity and more leakage drainage pumps 10 or the emergency drainage location in the hydropower station.

[0042] The following describes the self - circulation process of the lubricating water. The self - circulation process is based on step S4 and includes the following sub - steps:

[0043] S41. When the leakage drain pipe 11 is discharging the leakage water, there is water pressure in the leakage drain pipe 11. At this time, the PLC controller 13 obtains the water level of the lubricating water in the lubricating water tank 7 through the liquid level signaler 6 at the lubricating water tank 7. When the water level of the lubricating water is lower than the preset water filling level, the PLC controller 13 turns on the lubricating water circulation electric valve 3.

[0044] S42. After the lubricating water circulation electric valve 3 is turned on, a part of the leakage water in the leakage drain pipe 11 flows into the lubricating water tank 7 through the lubricating water circulation pipe and is stored as newly supplemented lubricating water. When the water level of the lubricating water reaches the preset full - water level, the PLC controller 13 turns off the lubricating water circulation electric valve 3, completing the replenishment of the lubricating water in the lubricating water tank 7 and waiting to be used in the self - lubrication process when the subsequent leakage drainage pump 10 starts.

[0045] Based on the above lubricating water self - circulation scheme, external water source - related devices can be no longer used after the system operates normally; because according to the implementation of the method process, the lubricating water tank 7 will at least maintain the storage volume of lubricating water required to start the leakage drainage pump 10 once, and the replenishment of the lubricating water is automatically completed during the leakage drainage this time.

Claims

1. A self-lubricating system for the lubricating water of a leakage drainage pump, comprising a leakage sump (15) and multiple leakage drainage pumps (10). The inlet pipe of each leakage drainage pump (10) extends into the bottom of the leakage sump (15), and each leakage drainage pump (10) is correspondingly connected to a leakage drainage pipe (11). The leakage drainage pump (10) is used to pump the seepage water in the leakage sump (15) and discharge it through the leakage drainage pipe (11); it is characterized in that: It also includes a lubricating water tank (7) and a PLC controller (13); the lubricating water tank (7) is respectively connected to each leakage drainage pump (10) through a lubricating water delivery pipe, and the lubricating water tank (7) is also connected to an external lubricating water pipe; a lubricating water output electric valve (8) is arranged on the lubricating water delivery pipe, and a liquid level signaler (6) for detecting the liquid level of the leakage water in the leakage sump (15) is also arranged at the leakage sump (15); the PLC controller (13) is respectively communicatively connected to each leakage drainage pump (10), the lubricating water output electric valve (8) and the liquid level signaler (6).

2. The self-lubricating system of the lubricating water for the leakage drainage pump according to claim 1, characterized in that: On the leakage drainage pipe (11) corresponding to each leakage drainage pump (10), a combined exhaust valve (17), a vacuum pressure gauge (14), a check valve (2) and a normally open manual valve (1) are sequentially arranged starting from the leakage drainage pump (10).

3. The self-lubricating system of the lubricating water for the leakage drainage pump according to claim 1, wherein: The lubricating water tank (7) is communicated with the external lubricating water pipe through a connecting pipe; on the connecting pipe, an external lubricating water control valve, a check valve (2), a normally open manual valve (1), a vacuum pressure gauge (14) and another normally open manual valve (1) are sequentially arranged starting from the external lubricating water pipe end.

4. The self-lubricating system of lubricating water for the leakage drainage pump according to claim 1, wherein: The lubricating water delivery pipe includes a main pipe section close to the lubricating water tank (7) and branch pipe sections corresponding to each leakage drainage pump (10); a normally open manual valve (1) is arranged on the main pipe section, and another normally open manual valve (1), a lubricating water output electric valve (8) and an insertion type flowmeter (9) are sequentially arranged starting from the main pipe section side on each branch pipe section; the PLC controller (13) is communicatively connected to the insertion type flowmeter (9), and the insertion type flowmeter (9) is used to feedback the lubricating water on-off flow signal to the PLC controller (13).

5. The self-lubricating system for the lubricating water of the leakage drainage pump according to claim 4, characterized in that: Both ends of the lubricating water output electric valve (8) are also communicated through a bypass pipe, and a standby manual valve (4) for manual control is arranged on the bypass pipe.

6. The self-lubricating system of the lubricating water for the leakage drainage pump according to claim 4, characterized in that: Water hammer absorbers (12) are arranged on the main pipe section and any branch pipe section.

7. The self-lubricating system of the lubricating water for the leakage drainage pump according to claim 1, wherein: The leakage drainage pipe (11) is also communicated to the lubricating water tank (7) through a lubricating water circulation pipe; on the lubricating water circulation pipe, a normally open manual valve (1), a check valve (2) and a lubricating water circulation electric valve (3) are sequentially arranged starting from the leakage drainage pipe (11) side; a liquid level signaler (6) for detecting the liquid level of the lubricating water in the lubricating water tank (7) is also arranged at the lubricating water tank (7), and the PLC controller (13) is communicatively connected to the lubricating water circulation electric valve (3) and all liquid level signalers (6).

8. The self-lubricating system of lubricating water for the leakage drainage pump according to claim 7, characterized in that: Both ends of the lubricating water circulation electric valve (3) are also communicated through a bypass pipe, and a standby manual valve (4) for manual control is arranged on the bypass pipe; an automatic water filter (5) is also arranged on the connecting pipe between the lubricating water circulation electric valve (3) and the lubricating water tank (7); an exhaust pipe is connected above the lubricating water tank (7), and a standby manual valve (4) for exhaust is also arranged on the exhaust pipe; a drainage pipe is connected below the lubricating water tank (7), and a standby manual valve (4) for drainage is also arranged on the drainage pipe.

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