An automatic oil leveling method for the oil sump of a hydro-generating unit

Abstract

The present invention provides an automatic oil leveling method for the oil sump of a hydro-generating unit, which includes a first detection unit and a second detection unit. The first detection unit is arranged on the oil supply system composed of an A-pressure oil and gas tank, an accident oil and gas tank, and a B-pressure oil and gas tank. The outer sides of the A-pressure oil and gas tank and the B-pressure oil and gas tank are respectively connected to the first unit's oil-using equipment and the second unit's oil-using equipment. The second detection unit is arranged on the oil return system composed of an A oil sump, a B oil sump, an A oil leakage tank, and a B oil leakage tank. The A oil sump and the B oil sump are connected by a pumping mechanism. The A oil sump and the A oil leakage tank are respectively connected to the first unit's oil-using equipment, and the B oil sump and the B oil leakage tank are respectively connected to the second unit's oil-using equipment. The oil pressure and oil level at each node are obtained through the first detection unit and the second detection unit, and the preset value is compared and judged to drive the pumping mechanism to complete the oil leveling action. The present invention is ingeniously designed, greatly improving the overall safety and stability.

Description

Technical Field

[0001] The present invention relates to the technical field of generator maintenance, and in particular to an automatic oil leveling method for the oil collecting tank of a hydro-generator set. Background Art

[0002] The oil used in the speed regulation system of a hydro-generator set in a hydropower station is generally turbine oil. Generally, an accident oil and gas tank is shared between adjacent units to provide an accident oil source, and one of the units supplies oil to the accident oil and gas tank. Because there is a certain leakage in the hydraulic valve parts of the speed regulation system, the oil of the unit supplying the accident oil and gas tank leaks to the speed regulation system of another unit through the valve parts related to the accident oil source. After running for a period of time, when the oil difference between the two units reaches a certain range, an oil leveling operation is required (that is, through the connecting pipe of the oil collecting tanks of the two units, the oil of the unit with more oil flows to the unit with less oil, reducing the oil difference between the two to a reasonable range) to ensure that the oil in the speed regulation systems of the two units is within a reasonable range.

[0003] Currently, generally, during the personnel inspection, the oil levels of the oil collecting tank, the compressed air and oil tank, the oil leakage tank and other parts of the unit are recorded, and then after algorithm conversion, the oil level difference between the two units is compared. Combining relevant conditions for judgment, when the oil leveling condition is reached, the connecting valve of the oil collecting tank is opened for the oil leveling operation of the oil collecting tank. The process only relies on the height difference of the oil level in the oil collecting tank to make the oil flow by itself. And due to the changes in the oil levels of the oil and gas tank and the oil collecting tank during the operation of the unit, the personnel cannot control the actual oil leveling effect. After the oil leveling operation for a period of time, the valve is closed to complete the oil leveling operation, and then manual calculation is still required to convert the oil leveling amount of the unit. The entire oil leveling operation has problems such as long oil leveling time, low efficiency, uncontrollable oil leveling effect, and inability to automatically count; there is also a problem that when one of the unit's oil pumps suddenly stops, the overall operation cannot be maintained. Summary of the Invention

[0004] The present invention provides an automatic oil leveling method for the oil collecting tank of a hydro-generator set, which solves the problems of low oil leveling efficiency, poor effect, limited use scenarios, and inability to ensure the normal and efficient operation of the unit.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is as follows: An automatic oil leveling method for the oil sump of a hydro-generating unit, which includes a first detection unit and a second detection unit. The first detection unit is arranged on the oil supply system composed of an A-pressure oil and gas tank, an accident oil and gas tank, and a B-pressure oil and gas tank. The outer sides of the A-pressure oil and gas tank and the B-pressure oil and gas tank are respectively connected to the first unit's oil-using equipment and the second unit's oil-using equipment. The second detection unit is arranged on the oil return system composed of an A oil sump, a B oil sump, an A oil leakage tank, and a B oil leakage tank. The A oil sump and the B oil sump are connected by a pumping mechanism. The A oil sump and the A oil leakage tank are respectively connected to the first unit's oil-using equipment, and the B oil sump and the B oil leakage tank are respectively connected to the second unit's oil-using equipment. The oil pressure and oil level at each node are obtained through the first detection unit and the second detection unit, and the oil leveling action is driven by comparing with the set preset value for judgment.

[0006] In the preferred solution, the detection steps of the first detection unit are as follows:

[0007] S1. After the system runs stably, the data of the first detection unit and the second detection unit are respectively obtained;

[0008] S2. Compare whether the obtained data is within a reasonable range;

[0009] S3. The control unit arranged on one side of the pumping mechanism performs corresponding actions and gives early warnings according to the result of S2.

[0010] In the preferred solution, in S1, the data of the first detection unit includes the oil level of the A oil and gas tank in the A-pressure oil and gas tank, the oil level of the accident oil and gas tank in the accident oil and gas tank, and the oil level of the B oil and gas tank in the B-pressure oil and gas tank.

[0011] In the preferred solution, in S1, the data of the second detection unit includes the oil level of the A oil leakage tank in the A oil leakage tank, the oil level of the A oil sump in the A oil sump, the oil level of the B oil sump in the B oil sump, and the oil level of the B oil leakage tank in the B oil leakage tank.

[0012] In the preferred solution, it also includes the A oil and gas tank pressure in the A-pressure oil and gas tank, the accident oil and gas tank pressure in the accident oil and gas tank, and the B oil and gas tank pressure in the B-pressure oil and gas tank.

[0013] In the preferred solution, after S3, a calculation unit is used to store and analyze each item of data. The calculation unit is electrically connected to the first detection unit, the second detection unit, and the control unit respectively, and the calculation unit is used for dynamic monitoring of the overall system.

[0014] In the preferred solution, the pumping mechanism includes a two-way oil pump and an electric valve. When the pumping mechanism receives the execution signal from the control unit, the two-way oil pump and the electric valve are opened simultaneously, so as to complete the oil transfer between the oil level of the A oil sump and the oil level of the B oil sump.

[0015] In a preferred solution, when any one of the oil pumps in the A-pressure oil and gas tank and the B-pressure oil and gas tank stops operating, the valve provided on the emergency pipeline at the bottom of the A-pressure oil and gas tank and the B-pressure oil and gas tank is opened, and the pumping mechanism executes an action and continues to return oil to the side where the pump has stopped.

[0016] In a preferred solution, when any one of the oil pumps in the A oil sump and the B oil sump stops operating, the valve provided on the first pipeline at the bottom of the A oil sump and the B-pressure oil and gas tank or the valve provided on the second pipeline at the bottom of the B oil sump and the A-pressure oil and gas tank is opened, and the pumping mechanism executes an action and continues to pump oil from the oil sump of the side where the pump has stopped.

[0017] In a preferred solution, when the oil level in the A oil and gas tank of the A-pressure oil and gas tank is within a reasonable range, the oil level in the B oil and gas tank of the B-pressure oil and gas tank is relatively low, and at the same time, the oil level in the A oil sump of the A oil sump is lower than the oil level in the B oil sump of the B oil sump, the pumping mechanism is driven to transfer the oil in the A oil sump to the B oil sump. Conversely, when the above situation is completely opposite, the pumping mechanism is driven to transfer the oil in the B oil sump to the A oil sump.

[0018] The beneficial effects of the present invention are as follows: The automated processing method can not only monitor the operating state of the unit, but also perform corresponding oil leveling actions in a timely manner, record the data of the entire process, and provide reliable support for the adjustment of subsequent solutions. (1) By obtaining the relevant parameters of the unit and configuring the oil leveling conditions of the unit, the device can realize the automatic oil leveling operation of the oil sump of the unit, saving labor costs; (2) Because it is equipped with a two-way oil pump, the oil leveling time is short and the efficiency is high; (3) The oil leveling effect is good; (4) It can count relevant data, provide early warning and alarm information according to the data results, and provide support for maintenance and repair personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the drawings and embodiments:

[0020] Figure 1 is the first state of the overall structure diagram of the present invention;

[0021] Figure 2 is the second state of the overall structure diagram of the present invention;

[0022] Figure 3 is the third state of the overall structure diagram of the present invention;

[0023] Figure 4 is the flowchart for judging the starting conditions of oil leveling of the present invention;

[0024] Figure 5 is the flowchart for judging the stopping conditions of oil leveling of the present invention.

[0025] In the figure: The pressure of oil and gas tank A is 1; the oil level of oil and gas tank A is 2; the oil level of oil collecting tank A is 3; the oil level of oil leakage tank A is 4; the pressure of oil and gas tank B is 5; the oil level of oil and gas tank B is 6; the oil level of oil collecting tank B is 7; the oil level of oil leakage tank B is 8; the pressure of accident oil and gas tank is 9; the oil level of accident oil and gas tank is 10; the oil-using equipment of the first unit is 11; the oil-using equipment of the second unit is 12; the pumping mechanism is 13; the two-way oil pump is 1301; the electric valve is 1302; the first pipeline is 14; the second pipeline is 15; the calculation unit is 16; the control unit is 17; the pressure oil and gas tank A is 18; the accident oil and gas tank is 19; the pressure oil and gas tank B is 20; the oil collecting tank A is 21; the oil collecting tank B is 22; the oil leakage tank A is 23; the oil leakage tank B is 24; the emergency pipeline is 25. Detailed implementation mode

[0026] As Figures 1-5 In, an automatic oil leveling method for the oil collecting tank of a hydro-generating unit includes a first detection unit and a second detection unit. The first detection unit is arranged on the oil supply system composed of the pressure oil and gas tank A 18, the accident oil and gas tank 19, and the pressure oil and gas tank B 20. The outer sides of the pressure oil and gas tank A 18 and the pressure oil and gas tank B 20 are respectively connected to the oil-using equipment 11 of the first unit and the oil-using equipment 12 of the second unit. The second detection unit is arranged on the oil return system composed of the oil collecting tank A 21, the oil collecting tank B 22, the oil leakage tank A 23, and the oil leakage tank B 24. The oil collecting tank A 21 and the oil collecting tank B 22 are connected through the pumping mechanism 13. The oil collecting tank A 21 and the oil leakage tank A 23 are respectively connected to the oil-using equipment 11 of the first unit. The oil collecting tank B 22 and the oil leakage tank B 24 are respectively connected to the oil-using equipment 12 of the second unit. The oil pressure and oil level at each node are obtained through the first detection unit and the second detection unit, and the oil leveling action is driven by comparing with the set preset value. With this structure, the division of labor is clear. The first detection unit and the second detection unit can quickly capture the data at each node, keep the data accurate and interference-free. The control unit 17 obtains the relevant parameters of the units with 2 common accident oil and gas tanks, and then the calculation unit 16 compares the data with the set range. Within the reasonable range, it continues to monitor, fits the dynamic data to form a trend curve. When the set warning value is reached, an alarm is issued and sent back to the central control room, and the relevant actions for oil leveling are completed accordingly.

[0027] In the preferred solution, the detection steps of the first detection unit are as follows:

[0028] S1. After the system runs stably, obtain the data of the first detection unit and the second detection unit respectively;

[0029] S2. Compare whether the obtained data is within the reasonable range interval;

[0030] S3. The control unit 17 arranged on one side of the pumping mechanism 13 executes corresponding actions and gives an alarm according to the result of S2.

[0031] If the leveling operation is to be performed, the control unit 17 controls the electric valve 1302 to open, then controls the two-way oil pump 1301 to open, operates according to the flow direction given by the control unit 17, and starts the leveling operation of the oil sump.

[0032] During the leveling process, the control unit 17 acquires the relevant parameters of the two units in real time, performs calculations and judgments. When the condition for stopping the leveling is reached, it controls the two-way oil pump 1301 to stop, closes the electric valve 1302, then automatically calculates the oil leveling amounts and the leveling flow directions of the units before and after leveling, backs up the recorded data, and can upload it to other calculation units 16. During the leveling operation, according to the data calculation results and judgment conditions, relevant early warning and alarm information are given. Thus, a single automatic leveling operation ends.

[0033] The control unit 17 starts the process of judging the leveling conditions as Figure 4 shown below:

[0034] 1) Whether the two units are in the running or standby state → 2) Whether the oil level difference after conversion of the two units reaches the set value for leveling → 3) Compare the unit with the relatively higher converted oil level with the standard oil level to see if it is within the set difference range (to avoid the situation where the actual oil level of the unit with the relatively higher converted oil level is lower than the standard oil level but the leveling operation is still carried out. In this case, an alarm is issued to remind the maintenance personnel to refuel the unit instead of performing the leveling operation) → 4) Compare the unit with the relatively lower converted oil level with the standard oil level to see if it is within the set difference range (to avoid the situation where the actual oil level of the unit with the relatively lower converted oil level is higher than the standard oil level but the leveling operation is still carried out. In this case, an alarm is issued to remind the maintenance personnel to drain the oil from the unit instead of performing the leveling operation) → 5) Perform the leveling operation, open the electric valve, and open the two-way oil pump.

[0035] The control unit 17's process of judging the leveling stop conditions is as Figure 5 shown below:

[0036] 1) Whether the two units are in the running or standby state → 2) Whether the oil level difference after conversion of the two units reaches the set difference for stopping the leveling (if satisfied, stop the leveling and count the data) → 3) Compare the unit with the relatively higher converted oil level with the standard oil level to see if it is within the set difference range → 4) Compare the unit with the relatively lower converted oil level with the standard oil level to see if it is within the set difference range → After a certain interval of time, loop back to 1).

[0037] In the preferred solution, the data of the first detection unit in S1 includes the oil level 2 of the A oil and gas tank in the A pressure oil and gas tank 18, the oil level 10 of the accident oil and gas tank in the accident oil and gas tank 19, and the oil level 6 of the B oil and gas tank in the B pressure oil and gas tank 20. With this structure, the overall monitoring is ensured to be relatively sufficient, providing direct data for subsequent analysis.

[0038] In a preferred solution, in S1, the data of the second detection unit includes the oil level 4 in the A leakage oil tank 23, the oil level 3 in the A oil collecting tank 21, the oil level 7 in the B oil collecting tank 22, and the oil level 8 in the B leakage oil tank 24. With this structure, the position of the leakage point and the relative liquid leakage rate can be analyzed through the above data, laying a foundation for subsequent maintenance and adjustment.

[0039] In a preferred solution, it also includes the A oil and gas tank pressure 1 in the A pressure oil and gas tank 18, the accident oil and gas tank pressure 9 in the accident oil and gas tank 19, and the B oil and gas tank pressure 5 in the B pressure oil and gas tank 20. Since the oil and gas tank is in a state of having both oil and gas, the safety of equipment operation is ensured by monitoring the air pressure, and at the same time, a stable oil supply is provided for the unit.

[0040] In a preferred solution, after S3, the calculation unit 16 stores and analyzes various data. The calculation unit 16 is electrically connected to the first detection unit, the second detection unit, and the control unit 17 respectively. The calculation unit 16 is used to dynamically monitor the overall system.

[0041] Perform data monitoring in multiple scenarios and modes:

[0042] 1. For a single unit, when all connections to the accident oil and gas tank are disconnected, multiple sets of parameters of the oil level in the pressure oil and gas tank, the oil collecting tank, and the leakage oil tank under different conditions can be obtained and automatically fitted into a conversion formula. After connecting the accident oil and gas tank, on the basis of the fitting conversion formula of a single unit, it is fitted into a conversion formula for the total oil volume of two units.

[0043] 2. Through the oil levels at each node, the A oil and gas tank oil level 2, the A oil collecting tank oil level 3, the A leakage oil tank oil level 4, the B oil and gas tank oil level 6, the B oil collecting tank oil level 7, the B leakage oil tank oil level 8, and the accident oil and gas tank oil level 10, according to the total oil volume conversion formula, the change trend of the total oil volume can be tracked, and it can be judged whether there is a leakage point in the overall A oil and gas tank + B oil and gas tank, and potential leakage hazards can be detected in a timely manner. Combined with the change trend of the flat oil statistical data, it can be judged which unit the leakage point occurs in.

[0044] 3. It can be judged whether there are air leakage points or problems with the air filling valve not being tightly closed in the A pressure oil and gas tank, B pressure oil and gas tank, and accident oil and gas tank through the change of the curve of the oil level and pressure relationship in the oil and gas tank.

[0045] 4. Through the change trend of the flat oil frequency and the flat oil volume statistics, combined with the leakage parameters of the valve parts in the relevant accident oil source oil circuit part, the change of the operation state of the relevant valve parts can be reflected, mainly whether the leakage amount exceeds the standard and deteriorates, providing a basis for equipment evaluation and guiding the formulation of the maintenance plan.

[0046] In the preferred solution, the pumping mechanism 13 includes a two-way oil pump 1301 and an electric valve 1302. When the pumping mechanism 13 receives an execution signal from the control unit 17, the two-way oil pump 1301 and the electric valve 1302 are opened simultaneously, thereby completing the oil transfer between the oil level 3 of the A oil collecting tank and the oil level 7 of the B oil collecting tank. With this structure, it is possible to cope with changes in various scenarios, and the oil can be transferred between the oil level 3 of the A oil collecting tank and the oil level 7 of the B oil collecting tank as needed, and it can also solve the problem that the low oil level cannot be transferred to the high oil level.

[0047] In the preferred solution, when any oil pump of the A pressure oil and gas tank 18 and the B pressure oil and gas tank 20 stops working, the valves on the emergency pipeline 25 at the bottom of the A pressure oil and gas tank 18 and the B pressure oil and gas tank 20 are opened, and the pumping mechanism 13 performs the action and continues to return oil to the stopped side. With this structure, when an emergency scenario occurs, the unit equipment has the ability to continue to operate, and the overall operation is safe and controllable, avoiding direct economic losses caused by shutdown.

[0048] In the preferred solution, when any oil pump in the A oil collection tank 21 and the B oil collection tank 22 stops, the valve set on the first pipeline 14 at the bottom of the A oil collection tank 21 and the B pressure oil and gas tank 20 or the valve set on the second pipeline 15 at the bottom of the B oil collection tank 22 and the A pressure oil and gas tank 18 is opened, and the pumping mechanism 13 performs the action and continues to pump oil from the oil collection tank of the stopped party. With this structure, it can still operate stably and efficiently in a variety of complex scenarios, ensuring that the unit equipment is in an efficient working condition, and at the same time, it can analyze various scenario data, so that parameter configuration can be carried out in a targeted manner in the future, and continuous optimization and iteration can be carried out.

[0049] In the preferred solution, when the A oil and gas tank oil level 2 in the A pressure oil and gas tank 18 is within a reasonable range, the B oil and gas tank oil level 6 in the B pressure oil and gas tank 20 is relatively low, and the A oil tank oil level 3 in the A oil tank 21 is lower than the B oil tank oil level 7 in the B oil tank 22, the pumping mechanism 13 is driven to transfer the oil in the A oil tank 21 to the B oil tank 22. Conversely, when the above situation is completely opposite, the pumping mechanism 13 is driven to transfer the oil in the B oil tank 22 to the A oil tank 21. With this structure, the problem of oil mismatch can be overcome, thereby ensuring the safe operation of the unit.

[0050] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An automatic oil leveling method for the oil sump of a hydro-generating unit, characterized in that: It includes a first detection unit and a second detection unit. The first detection unit is arranged on the oil supply system composed of an A-pressure oil and gas tank (18), an accident oil and gas tank (19), and a B-pressure oil and gas tank (20). The outsides of the A-pressure oil and gas tank (18) and the B-pressure oil and gas tank (20) are respectively connected to the first unit's oil-using equipment (11) and the second unit's oil-using equipment (12). The second detection unit is arranged on the oil return system composed of an A oil sump (21), a B oil sump (22), an A leakage oil tank (23), and a B leakage oil tank (24). The A oil sump (21) and the B oil sump (22) are connected through a pumping mechanism (13). The A oil sump (21) and the A leakage oil tank (23) are respectively connected to the first unit's oil-using equipment (11), and the B oil sump (22) and the B leakage oil tank (24) are respectively connected to the second unit's oil-using equipment (12). The oil pressure and oil level at each node are obtained through the first detection unit and the second detection unit, and the pumping mechanism (13) is driven to complete the oil leveling action according to the comparison and judgment with the set preset values; The detection steps of the first detection unit are as follows: S1. After the system runs stably, obtain the data of the first detection unit and the second detection unit respectively; S2. Compare whether the obtained data is within a reasonable range; S3. The control unit (17) arranged on one side of the pumping mechanism (13) performs corresponding actions and gives an alarm according to the result of S2; The pumping mechanism (13) includes a two-way oil pump (1301) and an electric valve (1302). When the pumping mechanism (13) receives the execution signal from the control unit (17), the two-way oil pump (1301) and the electric valve (1302) are opened simultaneously, so as to complete the oil transfer between the oil level of the A oil sump (3) and the oil level of the B oil sump (7).

2. The automatic oil leveling method for the oil sump of a hydro-generator set according to claim 1, wherein: in The data of the first detection unit in S1 includes the A oil and gas tank oil level (2) in the A-pressure oil and gas tank (18), the accident oil and gas tank oil level (10) in the accident oil and gas tank (19), and the B oil and gas tank oil level (6) in the B-pressure oil and gas tank (20).

3. The automatic oil leveling method for the oil sump of a water turbine generator set according to claim 1 is characterized in that: at The data of the second detection unit in S1 includes the A leakage oil tank oil level (4) in the A leakage oil tank (23), the A oil sump oil level (3) in the A oil sump (21), the B oil sump oil level (7) in the B oil sump (22), and the B leakage oil tank oil level (8) in the B leakage oil tank (24).

4. The automatic oil leveling method for the oil sump of a hydro-generating unit according to claim 2, characterized in that: It also includes the A oil and gas tank pressure (1) in the A-pressure oil and gas tank (18), the accident oil and gas tank pressure (9) in the accident oil and gas tank (19), and the B oil and gas tank pressure (5) in the B-pressure oil and gas tank (20).

5. A method for automatically leveling oil in an oil sump of a hydro-generating unit according to claim 1, characterized in that: After S3, the calculation unit (16) stores and analyzes each item of data. The calculation unit (16) is electrically connected to the first detection unit, the second detection unit, and the control unit (17) respectively, and the calculation unit (16) is used for dynamically monitoring the overall system.

6. The automatic oil leveling method for the oil sump of a hydro-generating unit according to claim 1, characterized in that: When any one of the oil pumps in the A-pressure oil and gas tank (18) and the B-pressure oil and gas tank (20) stops, open the valve on the emergency pipeline (25) at the bottom of the A-pressure oil and gas tank (18) and the B-pressure oil and gas tank (20), and the pumping mechanism (13) performs an action and continues to return oil to the side where the pump has stopped.

7. The automatic oil leveling method for the oil sump of a hydro-generating unit according to claim 1, characterized in that: When any one of the oil pumps in the A oil sump (21) and the B oil sump (22) stops operating, open the valve provided on the first pipeline (14) at the bottom of the A oil sump (21) and the B pressure oil and gas tank (20) or the valve provided on the second pipeline (15) at the bottom of the B oil sump (22) and the A pressure oil and gas tank (18), and the pumping mechanism (13) executes an action and continues to pump oil from the oil sump of the side where the pump has stopped.

8. A method for automatically leveling oil in an oil sump of a hydro-generating unit according to claim 1, characterized in that: When the oil level (2) of the A oil and gas tank in the A pressure oil and gas tank (18) is within a reasonable range, the oil level (6) of the B oil and gas tank in the B pressure oil and gas tank (20) is relatively low, and at the same time, the oil level (3) of the A oil sump in the A oil sump (21) is lower than the oil level (7) of the B oil sump in the B oil sump (22), drive the pumping mechanism (13) to transfer the oil in the A oil sump (21) to the B oil sump (22). Conversely, when the situation is exactly the opposite of the above, drive the pumping mechanism (13) to transfer the oil in the B oil sump (22) to the A oil sump (21).

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