Method for simplifying cooling oil way of thrust bearing of hydraulic generator

Abstract

The invention discloses a method for simplifying a hydro-generator thrust bearing cooling oil way, and relates to the technical field of hydro-generator bearings, and the method comprises the following steps: arranging a bearing seat bottom pressure equalizing cavity at the bottom of an oil groove, and communicating the bearing seat bottom pressure equalizing cavity with a high-level oil tank through an oil way in a rack; a thrust pad spacer block is arranged between the supporting pads, an oil injection device is fixed above the spacer block, and a communicated oil injection path is formed among the pressure equalizing cavity at the bottom of the bearing seat, the thrust pad supporting component and the thrust pad spacer block; lubricating oil is injected into the oil groove, oil circulation is started, so that the operating oil level of a unit is lower than a lubricating clearance surface between the runner plate and the thrust pad, the generator is started after the oil level is stable, and the cooled lubricating oil in the high-level oil tank enters the oil spraying oil way through the oil way in the rack and then enters the oil spraying device to be sprayed to the rotating surface of the runner plate; and entering a lubricating gap between the runner plate and the thrust pad. The thrust bearing cooling oil way can be simplified, the reliability of the oil way is guaranteed, and the lubricating effect and the cooling effect are improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic generator bearings, and in particular to a method for simplifying a hydraulic generator thrust bearing cooling oil circuit. Background Art

[0002] The thrust bearing is an important component of the hydro-turbine generator set. It supports the weight of the entire hydro-turbine generator set. The safety and reliability of its operation are directly related to the safe and stable operation of the entire hydro-turbine generator set. The thrust bearing is an important component of the thrust bearing.

[0003] At present, the lubrication and oil supply methods of thrust bearings mainly adopt immersion lubrication or direct oil supply lubrication. Immersion lubrication is to inject oil into the thrust bearing oil tank through an external circulation pipeline, and the oil is only injected into the oil tank. After the cooling oil enters the oil tank, it mixes with the hot oil in the oil tank and cools the bearing by immersing the sliding lubrication surface of the thrust bearing. Specifically, the thrust mirror plate of the thrust bearing rotates with the thrust, and dynamic pressure is generated between the thrust bearing and the thrust pad, which brings the oil in the oil tank into the space between the mirror plate and the thrust pad to form a lubricating and cooling oil film, thereby taking away the loss of the lubrication surface. However, immersion lubrication causes a large amount of additional oil stirring loss when the unit is running at high speed, which will reduce the operating efficiency of the generator; direct oil supply lubrication is to set a nozzle or open an oil outlet cavity on the oil inlet side of the thrust pad, so that the cold lubricating oil directly enters the working surface of the pad. However, this oil supply method often has a complex oil supply pipeline in the oil tank and poor installation and disassembly convenience. While reducing the reliability of the oil circuit operation, it will also occupy a large amount of space in the oil tank, making it more difficult to control the size of the oil tank and increase the cost of the unit.

[0004] A Chinese patent document with publication number CN104251374A and publication date December 31, 2014 discloses a method for reducing oil stirring loss of a combined thrust bearing, comprising the following steps: a. injecting lubricating oil into an oil tank so that the guide bearing bush is immersed in the lubricating oil; b. setting a high-level oil tank with a one-way exhaust valve, using an oil supply pump to inject the lubricating oil in the oil tank into the high-level oil tank, and injecting the lubricating oil between the mirror plate and the thrust bush, and / or between the bearing thrust head and the guide bearing bush through the high-level oil tank, so that the lubricating oil forms a cycle between the oil tank and the high-level oil tank, and the oil intake of the high-level oil tank is greater than the oil discharge of the high-level oil tank; c. as the oil volume in the high-level oil tank increases, the oil discharge of the high-level oil tank is gradually equal to the oil intake of the high-level oil tank through the one-way exhaust valve, and at this time, the lubricating oil level in the oil tank is located below the thrust bush. The invention can solve the problem of the thrust bearing being immersed in lubricating oil during operation in the prior art, and can avoid oil stirring loss.

[0005] However, the above technical solution, when supplying oil to the thrust bearing alone, is to connect the oil discharge port of the high-position oil tank by setting an oil discharge main pipe, and to set a second oil supply ring pipe with an oil injection branch pipe on the outer diameter side of the thrust bearing, and the second oil supply ring pipe is connected to the oil discharge main pipe, which has the following problems: 1. This technical solution sets up a complex pipeline structure, and there is a risk of oil leakage at the middle connection between the oil injection branch pipe and the second oil supply ring pipe, resulting in insufficient lubricating oil entering between the thrust bearing and the mirror plate, and reduced reliability. Such accidents have occurred during the actual operation of the power station, causing the thrust bearing temperature alarm.

[0006] 2. This technical solution adds many complex pipelines inside the oil tank, which increases the complexity of the system. It not only increases the difficulty of installation and maintenance, but also reduces the reliability of the system. It also occupies a large amount of internal space in the oil tank, thereby increasing the size of the oil tank and increasing the manufacturing cost of the unit.

[0007] 3. This technical solution sets up a complex pipeline structure in the oil tank, which makes it easy for the oil in the oil tank to collide with the pipeline during operation, causing oil splashing, and then forming oil mist, aggravating the oil mist overflow problem and polluting the generator.

[0008] 4. In this technical solution, the lubricating oil is pumped inward from the outer diameter side of the thrust bearing and the mirror plate. This design may cause uneven distribution of the lubricating oil, especially when running under high load or high speed. Due to the uneven pressure between the bearings and the fixed size of the pipeline, the flow rate of the pumped lubricating oil is inconsistent. The lubricating oil may not be able to completely cover the contact surface between the thrust bearing and the mirror plate, resulting in poor lubrication effect.

[0009] 5. This technical solution sets up a separate high-position oil tank, which occupies the generator space. Summary of the invention In order to solve the above technical problems, the present invention proposes a method for simplifying the cooling oil circuit of the thrust bearing of a hydro-turbine generator, which can ensure the reliability of the oil circuit and improve the lubrication and cooling effects while simplifying the cooling oil circuit of the thrust bearing.

[0011] The present invention is achieved by adopting the following technical solutions: A method for simplifying a cooling oil circuit of a thrust bearing of a hydro-generator comprises the following steps: a. A pressure equalizing cavity at the bottom of the bearing seat is provided at the bottom of the oil tank, and a high-position oil tank is provided at the top of the oil tank wall. An oil passage in the frame that fits the inner wall of the oil tank is provided to connect the pressure equalizing cavity at the bottom of the bearing seat with the high-position oil tank; b. A thrust pad spacer is arranged between the support pads above the thrust pad support component, and an oil spraying device is fixedly arranged above the thrust pad spacer. Oil holes are respectively arranged at the top of the pressure equalizing cavity at the bottom of the bearing seat, the thrust pad support component and the thrust pad spacer to form a connected oil spraying oil path. An oil inlet hole aligned with the oil hole is arranged at the bottom of the oil spraying device; c. Inject lubricating oil into the oil tank so that the initial oil level of the oil tank submerges the lubrication gap surface between the mirror plate and the thrust washer. Start the oil circulation so that the operating oil level of the unit is lower than the lubrication gap surface between the mirror plate and the thrust washer. After the oil level stabilizes, start the generator. The cooled lubricating oil in the high-level oil tank enters the pressure-equalizing cavity at the bottom of the bearing seat through the oil circuit in the frame, enters the oil injection circuit through the oil hole at the top of the pressure-equalizing cavity at the bottom of the bearing seat, and then enters the oil injection device. Finally, it is sprayed onto the rotating surface of the mirror plate through the spray gap, and the mirror plate brings it into the lubrication gap between the mirror plate and the thrust washer from the oil inlet edge.

[0012] In the step c, making the unit operating oil level lower than the lubrication gap surface between the mirror plate and the thrust bearing specifically includes: pumping the lubricating oil in the oil tank into the high-level oil tank through the oil outlet at the bottom of the oil tank and the external circulation cooling pipeline system.

[0013] In the step c, the oil enters the oil injection circuit through the oil hole at the top of the pressure equalizing chamber at the bottom of the bearing seat and then enters the oil injection device, which specifically includes: entering the oil hole of the thrust washer support component through the oil hole at the top of the pressure equalizing chamber at the bottom of the bearing seat and then flowing into the oil hole of the thrust washer spacer block and then entering the oil injection device. In the step a, the oil circuit in the frame utilizes the original rib plate position in the oil tank, and at least one circuit is provided.

[0014] In the step b, the oil injection circuit formed by the oil holes respectively arranged at the top of the pressure equalizing chamber at the bottom of the bearing seat, the thrust pad support component and the thrust pad spacer block corresponds to the oil injection device one by one.

[0015] The oil holes respectively arranged on the top of the pressure equalizing cavity at the bottom of the bearing seat, the thrust pad support component and the thrust pad spacer block are evenly arranged on the circumferential surface thereof, and the number of the oil injection paths formed is the same as the number of the thrust pads. The ratio of the total cross-sectional area of ​​the oil circuit in the frame, the circumferential cross-sectional area of ​​the pressure equalizing chamber at the bottom of the bearing seat, the total cross-sectional area of ​​all oil holes at the top of the pressure equalizing chamber at the bottom of the bearing seat, the total cross-sectional area of ​​all oil holes in the thrust washer support component, the total cross-sectional area of ​​all oil holes in the thrust washer spacer block, the total cross-sectional area of ​​the oil inlet holes at the bottom of all oil injection devices and the total cross-sectional area of ​​the spray slots of all oil injection devices is 2:1.5:1:1:1:1:0.8.

[0016] The spraying slot of the oil spraying device faces the lubrication gap surface between the thrust pad and the mirror plate on the adjacent side, and the inclination direction is consistent with the rotation direction of the mirror plate.

[0017] In the step a, each oil route in the rack is composed of an "L"-shaped cover plate, two "L"-shaped oil tank rib plates and an oil tank inner wall.

[0018] In the step a, the volume of the high-level oil tank is not less than the volume of the oil tank corresponding to the height difference between the initial oil level of the oil tank and the operating oil level.

[0019] The oil outlet at the bottom of the oil tank is arranged in the oil path area without the frame, and at least one oil outlet is arranged.

[0020] The present invention also includes arranging a sensor in the external circulation cooling pipeline system to monitor the oil flow rate and monitor the circulation status of the lubricating oil in real time. When an oil circulation failure occurs during the operation of the generator, that is, the pump fails and stops running, the sensor sends an abnormal oil flow signal, and the generator enters a fault shutdown process. The lubricating oil in the high-level oil tank flows into the oil tank through the oil path in the frame by gravity, and the oil level in the oil tank rises and submerges the lubrication gap surface, temporarily switching to immersion operation.

[0021] Compared with the prior art, the advantages of the present invention are: 1. The present invention simplifies the oil circuit system and reduces the complicated pipeline layout and segmented setting. In particular, a pressure equalizing chamber at the bottom of the bearing seat is set at the bottom of the oil tank, and is connected to the high-position oil tank on the frame through the oil circuit in the frame, which not only effectively reduces the complexity of the system, but also improves the reliability of the overall structure and reduces the spatial complexity in the generator. The simplified oil circuit system reduces the pipeline connection points, thereby reducing the risk of oil leakage and correspondingly reducing the complexity of installation and maintenance, which not only saves time and cost, but also improves the maintainability of the system and facilitates daily inspection and maintenance.

[0022] 2. The present invention can ensure that the lubricating oil is evenly distributed on the contact surface between the thrust washer and the mirror plate through the layout of the oil injection device and the oil injection oil circuit. The one-to-one correspondence between the oil injection device and the oil injection oil circuit and the reasonable arrangement of the oil holes enable the lubricating oil to enter from the middle of the oil injection pipe and then be pumped in both inward and outward directions and finally be sprayed from the radial spray slot, which can form a more uniform lubrication on the contact surface between the thrust washer and the mirror plate, avoid the uneven distribution of the lubricating oil caused by uneven pressure between the bearings, and ensure the safe and stable operation of the thrust bearing.

[0023] 3. In the present invention, the lubricating oil is sprayed onto the rotating surface of the mirror plate through the spray slot of the oil spray device, and is brought into the lubrication gap between the mirror plate and the thrust washer from the oil inlet edge of the mirror plate, so that the cooling oil is directly delivered to the oil inlet edge of the thrust washer, which can significantly reduce the temperature of the oil entering the lubrication surface of the mirror plate and the thrust washer, increase the oil film thickness, increase the oil film support stiffness, and improve the cooling effect.

[0024] 4. The present invention utilizes the original rib plate position in the oil tank to reasonably set the oil circuit, avoids the complexity of the newly added structure, reduces the circuitous and redundant paths of the lubricating oil, saves cost and space, and maintains the efficiency and stability of the oil circuit. The setting of the multi-channel oil circuit in the frame helps to improve the pressure uniformity of the pressure equalizing chamber at the bottom of the bearing seat. Under high load, long-term operation and other conditions, a single-channel oil circuit in the frame may cause uneven flow of the lubricating oil in the pressure equalizing chamber due to pressure fluctuations or local accumulation, while the multi-channel oil circuit can balance these differences to ensure the stability of the lubrication effect.

[0025] 5. In the present invention, the oil injection circuit is evenly arranged on the circumference of the top of the pressure equalizing chamber at the bottom of the bearing seat, which can make the oil flow more evenly distributed to the key parts of the thrust bearing and the mirror plate, avoiding unsatisfactory lubrication effect and component wear due to insufficient or uneven distribution of lubricating oil, and can ensure the stability of lubrication and the uniformity of lubricating oil in the lubrication gap, thereby improving the lubrication effect.

[0026] 6. The present invention, through the specific design of the cross-sectional area ratio of the oil circuit and the setting of the oil pressure equalizing chamber at the bottom of the bearing seat, makes the flow of lubricating oil in various parts more uniform and stable, can effectively control the pressure and flow of the oil flow, and is conducive to making the oil pressure of the nozzle between each tile equivalent, thereby reducing the pressure loss of the oil circuit and ensuring the consistency of the cold oil injection state.

[0027] 7. In the present invention, the spray slot of the oil spray device is oriented in the same direction as the lubrication gap and the tilting direction is consistent with the rotation direction, which helps the lubricating oil to be sprayed smoothly onto the contact surface and avoids deviation or impact of the lubricating oil.

[0028] 8. The present invention adopts the structural design of the "L"-shaped cover plate and the original "L"-shaped oil tank rib plate to simplify the manufacturing process of the oil circuit in the frame, reduce complex connecting parts and processes, reduce manufacturing and assembly costs, and reduce the risk of oil leakage.

[0029] 9. The present invention, by setting a high-position oil tank, can use gravitational potential energy to replenish oil to the oil tank when a fault occurs in the thrust bearing cooling external circulation pump and a pump failure occurs, thereby enabling the bearing lubrication surface to switch from non-immersion operation to immersion operation, ensuring that the bearing can operate safely and stably within the system fault removal time.

[0030] 10. The present invention can timely detect abnormalities in the oil circulation system by real-time monitoring of the oil circulation status, thereby ensuring the safe operation of the generator. Once an oil circulation failure occurs, the shutdown process can be automatically started to avoid damage to the system, and the system can be switched to the immersion operation mode to ensure the safety of the generator in the event of a failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flow chart of the steps of the method of the present invention; Figure 2 This is a schematic diagram of the lubricating oil circulation process of the present invention; Figure 3 For the present invention Figure 2 AA section view in; Figure 4 For the present invention Figure 2 BB section view in; Figure 5 It is a schematic diagram of the oil circulation process of the present invention.

[0032] Markings in the figure: 1. Frame; 2. Pressure-equalizing chamber at the bottom of the bearing seat; 3. Oil circuit in the frame; 4. High-position oil tank; 5. Thrust bearing support component; 6. Thrust bearing spacer block; 7. Thrust bearing; 8. Support bearing; 9. Oil injection device; 10. Oil hole; 11. Oil injection circuit; 12. Mirror plate; 13. Oil tank; 14. Oil outlet; 15. External circulation cooling pipeline system; 16. Spray seam; 17. Lubrication clearance surface; 18. Initial oil level; 19. Operating oil level. DETAILED DESCRIPTION

[0033] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1 As the most basic embodiment of the present invention, refer to Figure 2-5 A method for simplifying the cooling oil circuit of a thrust bearing of a hydro-generator comprises the following steps: a. A pressure equalizing chamber 2 at the bottom of the bearing seat is provided at the bottom of the oil tank 13, and a high-position oil tank 4 is provided at the top of the wall of the oil tank 13. An oil passage 3 in the frame that is in contact with the inner wall of the oil tank 13 is provided to connect the pressure equalizing chamber 2 at the bottom of the bearing seat with the high-position oil tank 4; b. A thrust pad spacer block 6 is arranged between the support pads 8 above the thrust pad support component 5, and an oil spraying device 9 is fixedly arranged above the thrust pad spacer block 6. Oil holes 10 are respectively arranged at the top of the pressure equalizing chamber 2 at the bottom of the bearing seat, the thrust pad support component 5 and the thrust pad spacer block 6 to form a connected oil spraying oil path 11. An oil inlet hole aligned with the oil hole 10 is arranged at the bottom of the oil spraying device 9; c. Inject lubricating oil into the oil tank 13 so that the initial oil level 18 of the oil tank 13 submerges the lubricating gap surface 17 between the mirror plate 12 and the thrust washer 7, start the oil circulation, make the unit operating oil level 19 lower than the lubricating gap surface 17 between the mirror plate 12 and the thrust washer 7, start the generator after the oil level stabilizes, and the cooled lubricating oil in the high-level oil tank 4 enters the pressure-equalizing chamber 2 at the bottom of the bearing seat through the oil path 3 in the frame, enters the oil injection path 11 through the oil hole 10 at the top of the pressure-equalizing chamber 2 at the bottom of the bearing seat, and then enters the oil injection device 9. Finally, the lubricating oil is sprayed onto the rotating surface of the mirror plate 12 through the spray slit 16 of the oil injection device 9, and is brought into the lubricating gap surface 17 between the mirror plate 12 and the thrust washer 7 from the oil inlet edge by the mirror plate 12.

[0035] This embodiment optimizes the oil circuit structure, reduces the complexity of the pipeline, accurately controls the oil level and oil injection, and effectively improves the lubrication and cooling effects of the thrust bearing of the turbine generator, which not only reduces the complexity and operating cost of the system, but also improves the stability of the system.

[0036] Example 2 As a preferred embodiment of the present invention, refer to Figure 2-5 A method for simplifying the cooling oil circuit of a thrust bearing of a hydro-generator comprises the following steps: a. A pressure equalizing chamber 2 at the bottom of the bearing seat is provided at the bottom of the oil tank 13, and a high-position oil tank 4 is provided at the top of the wall of the oil tank 13. An oil passage 3 in the frame that is in contact with the inner wall of the oil tank 13 is provided to connect the pressure equalizing chamber 2 at the bottom of the bearing seat with the high-position oil tank 4; b. A thrust pad spacer block 6 is arranged between the support pads 8 above the thrust pad support component 5, and an oil spraying device 9 is fixedly arranged above the thrust pad spacer block 6. Oil holes 10 are respectively arranged at the top of the pressure equalizing chamber 2 at the bottom of the bearing seat, the thrust pad support component 5 and the thrust pad spacer block 6 to form a connected oil spraying oil path 11. An oil inlet hole aligned with the oil hole 10 is arranged at the bottom of the oil spraying device 9; c. Inject lubricating oil into the oil tank 13 so that the initial oil level 18 of the oil tank 13 submerges the lubricating gap surface 17 between the mirror plate 12 and the thrust washer 7, start the oil circulation, and the lubricating oil in the oil tank 13 is pumped into the high-level oil tank 4 through the oil outlet 14 at the bottom of the oil tank 13 via the external cold circulation pipeline 15, so that the operating oil level 19 of the unit is lower than the lubricating gap surface 17 between the mirror plate 12 and the thrust washer 7. After the oil level stabilizes, start the generator, and the cooled lubricating oil in the high-level oil tank 4 enters the pressure-equalizing cavity 2 at the bottom of the bearing seat through the oil passage 3 in the frame, enters the oil hole 10 of the thrust washer support component 5 through the oil hole 10 at the top of the pressure-equalizing cavity 2 at the bottom of the bearing seat, and then flows into the oil hole 10 of the thrust washer spacer block 6, and enters the oil injection device 9. Finally, the lubricating oil is sprayed onto the rotating surface of the mirror plate 12 through the spray slit 16 of the oil injection device 9, and is brought into the lubricating gap surface 17 between the mirror plate 12 and the thrust washer 7 from the oil inlet edge by the mirror plate 12.

[0037] In step a, the oil circuit 3 in the frame is set up with four circuits by utilizing the original rib plate position in the oil groove 13 .

[0038] In the step b, the oil injection path 11 formed by the oil holes 10 respectively arranged at the top of the pressure equalizing chamber 2 at the bottom of the bearing seat, the thrust pad support component 5 and the thrust pad spacer block 6 corresponds to the oil injection device 9 one by one.

[0039] In this embodiment, the provision of the four-way internal oil circuit 3 of the frame helps to improve the pressure uniformity of the pressure equalizing chamber 2 at the bottom of the bearing seat, thereby ensuring the stability of the lubrication effect.

[0040] Example 3 As another preferred embodiment of the present invention, refer to Figure 2-5 A method for simplifying the cooling oil circuit of a thrust bearing of a hydro-generator comprises the following steps: a. A pressure equalizing chamber 2 at the bottom of the bearing seat is provided at the bottom of the oil tank 13, and a high-position oil tank 4 is provided at the top of the wall of the oil tank 13. An oil passage 3 in the frame that is in contact with the inner wall of the oil tank 13 is provided to connect the pressure equalizing chamber 2 at the bottom of the bearing seat with the high-position oil tank 4; b. A thrust pad spacer block 6 is arranged between the support pads 8 above the thrust pad support component 5, and an oil spraying device 9 is fixedly arranged above the thrust pad spacer block 6. Oil holes 10 are respectively arranged at the top of the pressure equalizing chamber 2 at the bottom of the bearing seat, the thrust pad support component 5 and the thrust pad spacer block 6 to form a connected oil spraying oil path 11. An oil inlet hole aligned with the oil hole 10 is arranged at the bottom of the oil spraying device 9; c. Inject lubricating oil into the oil tank 13 so that the initial oil level 18 of the oil tank 13 submerges the lubricating gap surface 17 between the mirror plate 12 and the thrust washer 7, start the oil circulation, and the lubricating oil in the oil tank 13 is pumped into the high-level oil tank 4 through the oil outlet 14 at the bottom of the oil tank 13 via the external cold circulation pipeline 15, so that the operating oil level 19 of the unit is lower than the lubricating gap surface 17 between the mirror plate 12 and the thrust washer 7. After the oil level stabilizes, start the generator, and the cooled lubricating oil in the high-level oil tank 4 enters the pressure-equalizing cavity 2 at the bottom of the bearing seat through the oil passage 3 in the frame, enters the oil hole 10 of the thrust washer support component 5 through the oil hole 10 at the top of the pressure-equalizing cavity 2 at the bottom of the bearing seat, and then flows into the oil hole 10 of the thrust washer spacer block 6, and enters the oil injection device 9. Finally, the lubricating oil is sprayed onto the rotating surface of the mirror plate 12 through the spray slit 16 of the oil injection device 9, and is brought into the lubricating gap surface 17 between the mirror plate 12 and the thrust washer 7 from the oil inlet edge by the mirror plate 12.

[0041] In step a, the oil circuit 3 in the frame is set up with four circuits by utilizing the original rib plate position in the oil groove 13 .

[0042] In the step b, the oil injection path 11 formed by the oil holes 10 respectively arranged at the top of the pressure equalizing chamber 2 at the bottom of the bearing seat, the thrust pad support component 5 and the thrust pad spacer block 6 corresponds to the oil injection device 9 one by one.

[0043] The oil holes 10 respectively arranged on the top of the pressure equalizing cavity 2 at the bottom of the bearing seat, the thrust pad support component 5 and the thrust pad spacer block 6 are evenly arranged on the circumferential surface, and the number of the oil injection channels formed is the same as the number of thrust pads.

[0044] The ratio of the total cross-sectional area of ​​the oil circuit 3 in the frame, the circumferential cross-sectional area of ​​the pressure equalizing chamber 2 at the bottom of the bearing seat, the total cross-sectional area of ​​all the oil holes 10 at the top of the pressure equalizing chamber 2 at the bottom of the bearing seat, the total cross-sectional area of ​​all the oil holes 10 in the thrust washer support component 5, the total cross-sectional area of ​​all the oil holes 10 in the thrust washer spacer block 6, the total cross-sectional area of ​​the bottom oil inlet holes of all the oil injection devices 9 and the total cross-sectional area of ​​the spray slots 16 of all the oil injection devices 9 is 2:1.5:1:1:1:1:0.8.

[0045] In this embodiment, the setting of the oil injection circuit can make the oil flow more evenly distributed to various parts of the thrust washer and the mirror plate, which can ensure the stability of lubrication and the uniformity of the lubricating oil in the lubrication gap. At the same time, the cross-sectional area ratio of the specific oil circuit ensures the oil pressure of the terminal oil circuit in the oil tank, improves the stability of the oil injection, thereby reducing the oil circuit pressure loss, which is conducive to ensuring the consistency of the cold oil injection state.

[0046] Example 4 As another preferred embodiment of the present invention, refer to Figure 2-5 A method for simplifying the cooling oil circuit of a thrust bearing of a hydro-generator comprises the following steps: a. A pressure equalizing chamber 2 at the bottom of the bearing seat is provided at the bottom of the oil tank 13, and a high-position oil tank 4 is provided at the top of the wall of the oil tank 13. An oil passage 3 in the frame that is in contact with the inner wall of the oil tank 13 is provided to connect the pressure equalizing chamber 2 at the bottom of the bearing seat with the high-position oil tank 4; b. A thrust pad spacer block 6 is arranged between the support pads 8 above the thrust pad support component 5, and an oil spraying device 9 is fixedly arranged above the thrust pad spacer block 6. Oil holes 10 are respectively arranged at the top of the pressure equalizing chamber 2 at the bottom of the bearing seat, the thrust pad support component 5 and the thrust pad spacer block 6 to form a connected oil spraying oil path 11. An oil inlet hole aligned with the oil hole 10 is arranged at the bottom of the oil spraying device 9; c. Inject lubricating oil into the oil tank 13 so that the initial oil level 18 of the oil tank 13 submerges the lubricating gap surface 17 between the mirror plate 12 and the thrust washer 7, start the oil circulation, and the lubricating oil in the oil tank 13 is pumped into the high-level oil tank 4 through the oil outlet 14 at the bottom of the oil tank 13 via the external cold circulation pipeline 15, so that the operating oil level 19 of the unit is lower than the lubricating gap surface 17 between the mirror plate 12 and the thrust washer 7. After the oil level stabilizes, start the generator, and the cooled lubricating oil in the high-level oil tank 4 enters the pressure-equalizing cavity 2 at the bottom of the bearing seat through the oil passage 3 in the frame, enters the oil hole 10 of the thrust washer support component 5 through the oil hole 10 at the top of the pressure-equalizing cavity 2 at the bottom of the bearing seat, and then flows into the oil hole 10 of the thrust washer spacer block 6, and enters the oil injection device 9. Finally, the lubricating oil is sprayed onto the rotating surface of the mirror plate 12 through the spray slit 16 of the oil injection device 9, and is brought into the lubricating gap surface 17 between the mirror plate 12 and the thrust washer 7 from the oil inlet edge by the mirror plate 12.

[0047] In the step a, at least one oil circuit 3 in the frame is set by utilizing the original rib plate position in the oil groove 13 .

[0048] In the step b, the oil injection path 11 formed by the oil holes 10 respectively arranged at the top of the pressure equalizing chamber 2 at the bottom of the bearing seat, the thrust pad support component 5 and the thrust pad spacer block 6 corresponds to the oil injection device 9 one by one.

[0049] The oil holes 10 respectively arranged on the top of the pressure equalizing cavity 2 at the bottom of the bearing seat, the thrust pad support component 5 and the thrust pad spacer block 6 are evenly arranged on the circumferential surface, and the number of the oil injection channels formed is the same as the number of thrust pads.

[0050] The ratio of the total cross-sectional area of ​​the oil circuit 3 in the frame, the circumferential cross-sectional area of ​​the pressure equalizing chamber 2 at the bottom of the bearing seat, the total cross-sectional area of ​​all the oil holes 10 at the top of the pressure equalizing chamber 2 at the bottom of the bearing seat, the total cross-sectional area of ​​all the oil holes 10 in the thrust washer support component 5, the total cross-sectional area of ​​all the oil holes 10 in the thrust washer spacer block 6, the total cross-sectional area of ​​the bottom oil inlet holes of all the oil injection devices 9 and the total cross-sectional area of ​​the spray slots 16 of all the oil injection devices 9 is 2:1.5:1:1:1:1:0.8.

[0051] The spray slot 16 of the oil spray device 9 faces the lubrication gap surface 17 between the thrust pad 7 and the mirror plate 12 on one adjacent side, and the inclination direction is consistent with the rotation direction of the mirror plate 12 .

[0052] In the step a, each internal oil circuit 3 of the frame is composed of an “L”-shaped cover plate, two “L”-shaped oil groove rib plates and the inner wall of the oil groove 13 .

[0053] In the step a, the volume of the high-level oil tank 4 is not less than the volume of the oil tank 13 corresponding to the height difference between the initial oil level 18 and the operating oil level 19 of the oil tank 13 .

[0054] An oil outlet 14 at the bottom of the oil tank 13 is provided in the area without the oil path 3 in the frame.

[0055] This embodiment helps to spray the lubricating oil smoothly onto the contact surface and avoids deviation or impact of the lubricating oil. The oil circuit in the frame utilizes the original ribs of the frame, which not only improves the strength but also effectively reduces the number of joints and connecting parts, thereby reducing the risk of oil circuit leakage.

[0056] Example 5 As the best embodiment of the present invention, refer to Figure 2-5 A method for simplifying the cooling oil circuit of a thrust bearing of a hydro-generator comprises the following steps: a. A pressure equalizing chamber 2 at the bottom of the bearing seat is provided at the bottom of the oil tank 13, and a high-position oil tank 4 is provided at the top of the wall of the oil tank 13. An oil passage 3 in the frame that is in contact with the inner wall of the oil tank 13 is provided to connect the pressure equalizing chamber 2 at the bottom of the bearing seat with the high-position oil tank 4; b. The thrust bearing support component 5, the support bearing 8, the thrust bearing 7, the thrust bearing spacer block 6, the oil injection device 9 and the mirror plate 12 are all arranged in the oil groove 13; the thrust bearing support component 5, the support bearing 8 and the thrust bearing 7 are arranged in sequence above the equalizing pressure chamber 2 at the bottom of the bearing seat, the thrust bearing spacer block 6 is located between two adjacent support bearings 8, and the oil injection device 9 is fixedly arranged above the thrust bearing spacer block 6, and oil holes 10 are respectively arranged at the top of the equalizing pressure chamber 2 at the bottom of the bearing seat, the thrust bearing support component 5 and the thrust bearing spacer block 6 to form a connected oil injection oil path 11, and an oil inlet hole aligned with the oil hole 10 is arranged at the bottom of the oil injection device 9; c. Inject lubricating oil into the oil tank 13 so that the initial oil level 18 of the oil tank 13 submerges the lubricating gap surface 17 between the mirror plate 12 and the thrust washer 7, start the oil circulation, and the lubricating oil in the oil tank 13 is pumped into the high-level oil tank 4 through the oil outlet 14 at the bottom of the oil tank 13 via the external cold circulation pipeline 15, so that the operating oil level 19 of the unit is lower than the lubricating gap surface 17 between the mirror plate 12 and the thrust washer 7. After the oil level stabilizes, start the generator, and the cooled lubricating oil in the high-level oil tank 4 enters the pressure-equalizing cavity 2 at the bottom of the bearing seat through the oil passage 3 in the frame, enters the oil hole 10 of the thrust washer support component 5 through the oil hole 10 at the top of the pressure-equalizing cavity 2 at the bottom of the bearing seat, and then flows into the oil hole 10 of the thrust washer spacer block 6, and enters the oil injection device 9. Finally, the lubricating oil is sprayed onto the rotating surface of the mirror plate 12 through the spray slit 16 of the oil injection device 9, and is brought into the lubricating gap surface 17 between the mirror plate 12 and the thrust washer 7 from the oil inlet edge by the mirror plate 12.

[0057] In the step a, at least one oil circuit 3 in the frame is set by utilizing the original rib plate position in the oil groove 13 .

[0058] In the step b, the oil injection path 11 formed by the oil holes 10 respectively arranged at the top of the pressure equalizing chamber 2 at the bottom of the bearing seat, the thrust pad support component 5 and the thrust pad spacer block 6 corresponds to the oil injection device 9 one by one.

[0059] The oil holes 10 respectively arranged on the top of the pressure equalizing cavity 2 at the bottom of the bearing seat, the thrust pad support component 5 and the thrust pad spacer block 6 are evenly arranged on the circumferential surface, and the number of the oil injection channels formed is the same as the number of thrust pads.

[0060] The ratio of the total cross-sectional area of ​​the oil circuit 3 in the frame, the circumferential cross-sectional area of ​​the pressure equalizing chamber 2 at the bottom of the bearing seat, the total cross-sectional area of ​​all the oil holes 10 at the top of the pressure equalizing chamber 2 at the bottom of the bearing seat, the total cross-sectional area of ​​all the oil holes 10 in the thrust washer support component 5, the total cross-sectional area of ​​all the oil holes 10 in the thrust washer spacer block 6, the total cross-sectional area of ​​the bottom oil inlet holes of all the oil injection devices 9 and the total cross-sectional area of ​​the spray slots 16 of all the oil injection devices 9 is 2:1.5:1:1:1:1:0.8.

[0061] The spraying slot 16 of the oil spraying device 9 faces the lubrication gap 17 between the thrust washer 7 and the mirror plate 12 on one adjacent side, and the inclination direction is consistent with the rotation direction of the mirror plate 12 .

[0062] In the step a, each internal oil circuit 3 of the frame is composed of an “L”-shaped cover plate, two “L”-shaped oil groove rib plates and the inner wall of the oil groove 13 .

[0063] In the step a, the volume of the high-level oil tank 4 is not less than the volume of the oil tank 13 corresponding to the height difference between the initial oil level 18 and the operating oil level 19 of the oil tank 13 .

[0064] The oil outlet 14 at the bottom of the oil tank 13 is arranged in the area without the oil path 3 in the frame, and at least one oil outlet 14 is arranged.

[0065] A sensor is set in the external circulation cooling pipeline system to monitor the oil flow and the circulation status of the lubricating oil in real time. When the generator is running and an oil circulation failure occurs suddenly, that is, the pump fails and stops running, the sensor sends an oil flow abnormality signal, and the generator enters the fault shutdown process. The lubricating oil in the high-level oil tank 4 flows into the oil groove 13 through the oil path 3 in the frame by gravity, and the oil level in the oil groove 13 rises and submerges the lubrication gap surface 17, switching to immersion operation.

[0066] In this embodiment, when a sudden oil circulation failure occurs, the pump stops pumping lubricating oil to the high-level oil tank, and utilizes the gravity of the lubricating oil in the high-level oil tank to make it flow into the oil tank through the oil path in the frame, so that the oil level in the oil tank rises and submerges the lubrication gap surface, and automatically switches to the immersion operation mode, ensuring that the lubrication system can still maintain lubrication even in the event of an oil circulation failure, avoiding dry friction of the lubrication gap surface, and ensuring the safe operation of the equipment during shutdown.

Claims

1. A method for simplifying the cooling oil circuit of a hydraulic generator thrust bearing, characterized in that: The following steps are involved: a. A bearing seat bottom pressure equalizing chamber (2) is provided at the bottom of the oil groove (13), and a high-position oil tank (4) is provided at the top of the oil groove (13) wall; an internal frame oil passage (3) is provided that is in contact with the inner wall of the oil groove (13) to connect the bearing seat bottom pressure equalizing chamber (2) with the high-position oil tank (4); b. a thrust washer spacer (6) is arranged between the support washer (8) above the thrust washer support component (5), and an oil injection device (9) is fixedly arranged above the thrust washer spacer (6); oil holes (10) are respectively arranged at the top of the pressure equalizing chamber (2) at the bottom of the bearing seat, the thrust washer support component (5) and the thrust washer spacer (6) to form a connected oil injection path (11); an oil inlet hole aligned with the oil hole (10) is arranged at the bottom of the oil injection device (9); c. Lubricating oil is injected into the oil tank (13) so that the initial oil level (18) of the oil tank (13) submerges the lubricating gap surface (17) between the mirror plate (12) and the thrust washer (7), and the oil circulation is started. The oil circulation specifically refers to making the unit operating oil level (19) lower than the lubricating gap surface (17) between the mirror plate (12) and the thrust washer (7). After the oil level stabilizes, the generator is started, and the cooled lubricating oil in the high-level oil tank (4) enters the pressure equalizing chamber (2) at the bottom of the bearing seat through the oil passage (3) in the frame, enters the oil injection passage (11) through the oil hole (10) at the top of the pressure equalizing chamber (2) at the bottom of the bearing seat, and then enters the oil injection device (9). Finally, it is sprayed onto the rotating surface of the mirror plate (12) through the spray slit (16), and is brought into the lubricating gap surface (17) between the mirror plate (12) and the thrust washer (7) from the oil inlet side by the mirror plate (12).

2. The method for simplifying the cooling oil circuit of the thrust bearing of a hydraulic generator according to claim 1, characterized in that: In step c, making the unit operating oil level (19) lower than the lubrication clearance surface (17) between the mirror plate (12) and the thrust washer (7) specifically includes: pumping the lubricating oil in the oil tank (13) into the high-level oil tank (4) through the oil outlet (14) at the bottom of the oil tank (13) via the external circulation cooling pipeline system (15).

3. The method for simplifying the cooling oil circuit of the thrust bearing of a hydro-generator according to claim 2, characterized in that: In step c, the oil enters the oil injection circuit (11) through the oil hole (10) at the top of the pressure equalizing chamber (2) at the bottom of the bearing seat, and then enters the oil injection device (9), which specifically includes: entering the oil hole (10) of the thrust washer support component (5) through the oil hole (10) at the top of the pressure equalizing chamber (2) at the bottom of the bearing seat, then flowing into the oil hole (10) of the thrust washer spacer block (6), and then entering the oil injection device (9).

4. The method for simplifying the cooling oil circuit of the thrust bearing of a hydraulic generator according to claim 3, characterized in that: In the step a, at least one oil circuit (3) in the frame is provided by utilizing the original rib plate position in the oil tank (13).

5. The method for simplifying the cooling oil circuit of the thrust bearing of a hydraulic generator according to claim 4, characterized in that: In the step b, the oil injection path (11) formed by the oil holes (10) respectively provided at the top of the pressure equalizing chamber (2) at the bottom of the bearing seat, the thrust pad support component (5) and the thrust pad spacer block (6) corresponds to the oil injection device (9) one by one.

6. The method for simplifying the cooling oil circuit of the thrust bearing of a hydraulic generator according to claim 5, characterized in that: The oil holes (10) respectively provided at the top of the pressure equalizing cavity (2) at the bottom of the bearing seat, the thrust pad support component (5) and the thrust pad spacer block (6) are evenly arranged on their circumferential surfaces, and the number of the formed oil injection paths is the same as the number of thrust pads.

7. A method for simplifying the cooling oil circuit of a hydraulic generator thrust bearing according to any one of claims 1 to 6, characterized in that: The ratio of the total cross-sectional area of ​​the oil path (3) in the frame, the circumferential cross-sectional area of ​​the pressure equalizing chamber (2) at the bottom of the bearing seat, the total cross-sectional area of ​​all the oil holes (10) at the top of the pressure equalizing chamber (2) at the bottom of the bearing seat, the total cross-sectional area of ​​all the oil holes (10) of the thrust washer support component (5), the total cross-sectional area of ​​all the oil holes (10) of the thrust washer spacer (6), the total cross-sectional area of ​​the bottom oil inlet holes of all the oil injection devices (9) and the total cross-sectional area of ​​the spray slots (16) of all the oil injection devices (9) is 2:1.5:1:1:1:1:0.

8.

8. The method for simplifying the cooling oil circuit of the thrust bearing of a hydro-generator according to claim 7, characterized in that: The spray slot (16) of the oil spray device (9) faces the lubrication gap surface (17) between the thrust pad (7) and the mirror plate (12) on the adjacent side, and the inclination direction is consistent with the rotation direction of the mirror plate (12).

9. The method for simplifying the cooling oil circuit of the thrust bearing of a hydro-generator according to claim 8, characterized in that: In step a, the oil circuit (3) in the frame is composed of an "L"-shaped cover plate, two "L"-shaped oil groove rib plates and the inner wall of the oil groove (13).

10. The method for simplifying the cooling oil circuit of the thrust bearing of a hydraulic generator according to claim 9, characterized in that: In the step a, the volume of the high-level oil tank (4) is not less than the volume of the oil tank (13) corresponding to the height difference between the initial oil level (18) and the operating oil level (19) of the oil tank (13).

11. The method for simplifying the cooling oil circuit of the thrust bearing of a hydraulic generator according to claim 10, characterized in that: The oil outlet (14) at the bottom of the oil tank (13) is arranged in an area without the oil path (3) in the frame, and at least one oil outlet is arranged.

12. The method for simplifying the cooling oil circuit of the thrust bearing of a hydraulic generator according to claim 11, characterized in that: The method also includes arranging a sensor in the external circulation cooling pipeline system to monitor the oil level and monitor the circulation status of the lubricating oil in real time. When an oil circulation failure occurs during the operation of the generator, that is, the pump fails and stops running, the sensor sends an oil flow abnormality signal, and the generator enters a fault shutdown process. The lubricating oil in the high-level oil tank (4) flows into the oil tank (13) through the oil path (3) in the frame by gravity, and the oil level in the oil tank (13) rises and submerges the lubricating gap surface (17), switching to immersion operation.

Images