Self-circulating low liquid level spray guide bearing structure

Abstract

This invention provides a self-circulating low-level spray guide bearing structure, relating to the field of generator technology. It includes an auxiliary oil tank, a bearing support ring, a guide bearing support ring, a main oil tank, an oil cooler, an oil guide plate, a guide bearing shell, and a sliding rotor that rotates with the main shaft. During unit operation, the lubricating oil in the main oil tank is pressurized by a viscous pump and enters the high-pressure oil chamber. The lubricating oil in the high-pressure oil chamber is divided into two paths via an oil spray pipe. One path of lubricating oil acts on the sliding rotor and guide bearing shell through a spray slit and flows into the main oil tank through a return oil hole. The lubricating oil on the outer diameter side of the main oil tank is cooled by the oil cooler and then pressurized by the viscous pump before entering the high-pressure oil chamber for the next cycle. The other path of lubricating oil flows into the auxiliary oil tank through an oil spray pipe. After the above circulation, the liquid level in the main oil tank is reduced to the lower plane of the guide bearing shell. The low liquid level reduces the stirring loss between the rotating parts and the lubricating oil, and fundamentally reduces the generation of oil mist. The auxiliary oil tank ensures that the bearing lubrication returns to the traditional immersion operation state under low-speed conditions.

Description

Technical Field

[0001] This invention relates to the field of generator technology, and in particular to a self-circulating low-level spray guide bearing structure. Background Technology

[0002] Guide bearings typically employ an internal circulation lubrication method. This involves placing an oil guide ring under the sliding rotor to guide oil through the gap between the two bearing shells, causing the oil to circulate out from behind the bearing shells and then be cooled by a cooler for further lubrication. However, because the oil passage between the bearing shells is uncontrolled, the lubricating oil experiences severe turbulence. Oil mist accumulation in the oil sump can easily cause oil mist to overflow, thus contaminating the stator and rotor.

[0003] To address the aforementioned issues, Chinese patent document CN116428278A, published on July 14, 2023, discloses an internal circulation structure for a guide bearing. This structure includes an oil tank, a cooler, a bearing housing, guide bearing pads, and a sliding rotor. It also includes a viscous pump plate and a guide bearing support ring. The viscous pump plate is fixed to the bottom of the guide bearing support ring, corresponding to the lower plane of the sliding rotor. An oil collecting chamber is provided on the guide bearing support ring, with multiple radial oil guide holes on the outer side of the chamber, communicating with the oil collecting chamber. An oil spray pipe is provided between adjacent guide bearing pads, with the upper part of the radial oil guide holes connected to the oil spray pipe. An oil drain port is provided on the bearing housing. This invention utilizes the principle of a viscous pump to circulate lubricating oil and directly introduces the lubricating oil into the cooler through an oil drain port at the rear end of the bearing housing, significantly shortening the lubricating oil path. Simultaneously, the guide bearing pad lubrication employs a direct injection lubrication structure, effectively improving the cooling effect and efficiency of the guide bearing pads.

[0004] However, the existing technology uses an internal circulation immersion spray oil supply structure. Because the liquid level submerges the guide bearing bearing, it is immersed in lubricating oil. The oil level is high, and the lubricating oil is violently turbulent under the agitation of the rotating parts, which easily forms a large amount of oil mist. Moreover, the oil mist diffuses with the airflow inside the assembly and will adhere to the surface of the stator and rotor windings, contaminating the stator and rotor. When the rotating parts rotate at high speed, they need to overcome the viscous resistance of the oil to agitate the oil, resulting in a large amount of agitation loss. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a self-circulating low-level spray lubrication guide bearing structure. Compared to existing technologies, this internal circulation guide bearing structure achieves self-circulation, low-level, spray lubrication operation. The self-circulating oil circuit does not require an external pump for power. The sprayed lubricating oil acts directly on the sliding rotor and guide bearing pads, providing precise oil supply and cooling. The auxiliary oil tank lowers the level of the main oil tank, reducing the stirring loss between rotating parts and lubricating oil, fundamentally reducing oil mist generation. Furthermore, the auxiliary oil tank ensures that bearing lubrication returns to the traditional immersion operation state under low-speed conditions, ensuring the operational reliability of the guide bearing pads.

[0006] This invention is achieved through the following technical solution: A self-circulating low-level spray guide bearing structure includes an auxiliary oil tank, a bearing rear support ring, a guide bearing support ring, a main oil tank, an oil cooler, an oil guide plate, a guide bearing bearing, and a sliding rotor that rotates with the main shaft. Both the rear support ring and the guide bearing support ring are integral ring structures. The guide bearing pads are assembled on the guide bearing support ring. Multiple guide bearing pads are evenly arranged along the circumference of the guide bearing support ring, and the guide bearing support ring provides axial support for the guide bearing pads. The guide bearing support ring is connected to the bottom of the rear support ring, and the rear support ring provides radial support for the guide bearing pads. The bottom of the guide bearing support ring is connected to the oil guide plate. The oil guide plate is set opposite to the lower plane of the sliding rotor, and a small annular gap is formed between them. When the sliding rotor moves relative to the oil guide plate, this small annular gap forms a viscous pump. The oil guide plate, the guide bearing support ring, and the sliding rotor together form an annular high-pressure oil chamber. An oil injection pipe is provided between adjacent guide bearings. The high-pressure oil chamber is connected to one end of the oil injection pipe, and the other end of the oil injection pipe is connected to the auxiliary oil tank. The oil injection pipe is provided with spray slots that spray lubricating oil toward the surface of the sliding rotor and the oil inlet and outlet edges of the guide bearings. When the unit is running, the lubricating oil in the main oil tank is pressurized by the viscous pump and enters the high-pressure oil chamber. The lubricating oil in the high-pressure oil chamber is divided into two paths through the oil spray pipe. One path of lubricating oil acts on the sliding rotor and guide bearing bearing through the spray slits, and flows into the main oil tank through multiple oil return holes that are evenly opened on the lower circumference of the support ring behind the bearing and are connected to the main oil tank. The lubricating oil on the outer diameter side of the main oil tank is cooled by the oil cooler and flows to the inner diameter side of the main oil tank. After being pressurized by the viscous pump, it enters the high-pressure oil chamber to enter the next cycle. The other path of lubricating oil continuously flows into the auxiliary oil tank through the oil spray pipe, and the liquid level in the main oil tank is reduced to the lower plane of the guide bearing bearing.

[0007] More preferably, after the auxiliary oil tank is filled with lubricating oil, the liquid level in the main oil tank drops to the lower plane of the guide bearing bearing.

[0008] More preferably, when the unit speed decreases, the lubricating oil in the auxiliary oil tank is supplied to the spray nozzle in reverse through the oil injection pipe.

[0009] More preferably, when the unit is shut down, the liquid level in the auxiliary oil tank gradually decreases until the liquid level in the auxiliary oil tank is the same as the liquid level in the main oil tank. When the unit is started up again, the guide bearing bearing is in a semi-immersed state during the start-up and low-speed phases. After stable operation, the liquid level in the main oil tank is pulled down to the lower plane of the guide bearing bearing.

[0010] More preferably, the circumferential gap between the guide bearing support ring and the sliding rotor is 0.5 to 1 mm, and the circumferential gap is not less than the gap between the guide bearing pad and the sliding rotor.

[0011] More preferably, the height of the annular gap between the oil guide plate and the lower plane of the sliding rotor is 4-6 mm.

[0012] More preferably, the auxiliary oil tank is provided with an oil drain hole at the bottom, and the auxiliary oil tank is connected to the main oil tank through the oil drain hole.

[0013] More preferably, the auxiliary fuel tank has multiple exhaust and air supply pipes evenly distributed along its circumference.

[0014] More preferably, the fuel injection pipe is connected to the auxiliary fuel tank via a flange, and the fuel inlet of the flange is eccentrically designed.

[0015] More preferably, the cross-sectional area of ​​the oil return hole is 2 to 4 times the flow area of ​​the oil injection pipe, and the flow velocity of the lubricating oil at the oil return hole is less than 1 m / s.

[0016] The beneficial effects of this invention are as follows: 1. This invention provides oil circuit power through a viscous pump formed by the rotation of the sliding rotor and the oil guide plate, eliminating the need for an external pump and reducing equipment costs; by setting up an auxiliary oil tank to extract part of the lubricating oil, the liquid level in the main oil tank drops to the lower plane of the guide bearing bearing. The low liquid level prevents the rotating parts from being immersed in the oil, reducing the stirring loss between the rotating parts and the lubricating oil, and fundamentally reducing the generation of oil mist.

[0017] 2. In this invention, when the unit speed decreases, the viscous pump power weakens and the output flow of the high-pressure oil chamber is insufficient. The flow of the spray slit is supplemented by reverse oil supply from the auxiliary oil tank to avoid insufficient oil supply and ensure the reliability of oil supply cooling. At the same time, the liquid level in the main oil tank rises, allowing the guide bearing pad to return to the soaking state, ensuring that the guide bearing pad can still be fully lubricated at low speeds.

[0018] 3. In this invention, the circumferential gap between the guide bearing support ring and the sliding rotor is 0.5 to 1 mm, which ensures that the pressure and oil flow in the high-pressure oil chamber are reduced. This gap is larger than the gap between the guide bearing and the sliding rotor, so as to prevent the guide bearing support ring from playing the role of the guide bearing.

[0019] 4. In this invention, the small gap between the lower end face of the sliding rotor and the oil guide plate is 4 to 6 mm. Controlling the height of this gap within the range of 4 to 6 mm can avoid the problem of reduced flow rate and pressure head caused by excessively large or small gaps.

[0020] 5. In this invention, the guide bearing pads are in a traditional soaking state during the start-up moment and low speed stage of the unit, ensuring the safety of the guide bearing pads during the start-up process of the unit.

[0021] 6. In this invention, the cross-sectional area of ​​the return oil hole is 2 to 4 times the flow area of ​​the spray pipe. A sufficiently large cross-sectional area allows the lubricating oil after spraying to flow back quickly to the outer diameter side of the main oil tank, preventing the lubricating oil from accumulating in the guide bearing area and raising the oil level, thus ensuring that the liquid level in the main oil tank is stably maintained at the lower plane of the guide bearing. The flow velocity of the lubricating oil at the return oil hole is less than 1 m / s, preventing the lubricating oil from violently impacting the liquid surface of the main oil tank after being sprayed out of the return oil hole, causing oil splashing, tumbling, and forming a large amount of oil mist. Attached Figure Description

[0022] Figure 1 This is a half-sectional perspective view of the present invention (without the guide bearing pad, main shaft and sliding rotor). Figure 2 for Figure 1 A partial sectional view; Figure 3 This is a schematic diagram of the oil drain hole and the exhaust air supply pipe; Figure 4 This invention provides a schematic diagram of the oil circuit during normal operation of the generator unit. Figure 5 A schematic diagram of the oil circuit of this invention when the unit speed decreases; Attached reference numerals: 1-Auxiliary oil tank; 2-Rear bearing support ring; 3-Guide bearing support ring; 4-Main oil tank; 5-Oil cooler; 6-Oil guide plate; 7-Small clearance; 8-High pressure oil chamber; 9-Oil injection pipe; 10-Guide bearing shell; 11-Sliding rotor; 12-Flange; 13-Exhaust and air supply pipe; 14-Oil drain hole; 15-Main shaft; 16-Oil return hole; 17-Frame. Detailed Implementation

[0023] Example 1 like Figures 1-5 As shown, a self-circulating low-level spray guide bearing structure includes an auxiliary oil tank 1, a bearing rear support ring 2, a guide bearing support ring 3, a main oil tank 4, an oil cooler 5, an oil guide plate 6, a guide bearing bearing 10, and a sliding rotor 11 that rotates with the main shaft 15. Both the rear support ring 2 and the guide bearing support ring 3 are integral ring structures. The guide bearing 10 is assembled on the guide bearing support ring 3. Multiple guide bearing 10s are evenly arranged along the circumference of the guide bearing support ring 3, and the guide bearing support ring 3 provides axial support for the guide bearing 10. The guide bearing support ring 3 is bolted to the bottom of the rear support ring 2, and the rear support ring 2 provides radial support for the guide bearing 10. The bottom of the guide bearing support ring 3 is connected to the oil guide plate 6 by bolts. The oil guide plate 6 is set opposite to the lower plane of the sliding rotor 11, and a small annular gap 7 is formed between them. When the sliding rotor 11 moves relative to the oil guide plate 6, the small annular gap 7 forms a viscous pump. The oil guide plate 6, the guide bearing support ring 3, and the sliding rotor 11 together form an annular high-pressure oil chamber 8. An oil injection pipe 9 is provided between adjacent guide bearing bearings 10. One end of the high-pressure oil chamber 8 is connected to the oil injection pipe 9, and the other end of the oil injection pipe 9 is connected to the auxiliary oil tank 1. The oil injection pipe 9 is provided with a spray slit for spraying lubricating oil toward the surface of the sliding rotor 11 and the oil inlet and outlet edges of the guide bearing bearings 10. When the unit is running, the lubricating oil in the main oil tank 4 is pressurized by the viscous pump and enters the high-pressure oil chamber 8. The lubricating oil in the high-pressure oil chamber 8 is divided into two paths by the oil spray pipe 9. One path of lubricating oil acts on the sliding rotor 11 and the guide bearing 10 through the spray slits. It flows into the main oil tank 4 through multiple oil return holes 16 that are evenly opened on the lower circumference of the support ring 2 behind the bearing and are connected to the main oil tank 4. The lubricating oil on the outer diameter side of the main oil tank 4 is cooled by the oil cooler 5 and flows to the inner diameter side of the main oil tank 4. After being pressurized by the viscous pump, it enters the high-pressure oil chamber 8 to enter the next cycle. The other path of lubricating oil continuously flows into the auxiliary oil tank 1 through the oil spray pipe 9. The liquid level in the main oil tank 4 drops to the lower plane of the guide bearing 10.

[0024] Specifically, during normal operation, the sliding rotor 11 rotates with the main shaft 15. The annular gap 7 between the lower plane of the sliding rotor 11 and the oil guide plate 6 forms a viscous pump due to the movement of the sliding rotor 11 relative to the oil guide plate 6. The lubricating oil in the main oil tank 4 is pressurized under the action of the viscous pump, providing power for the oil circuit circulation. During normal operation, the pressure in the high-pressure oil chamber 8 > the pressure in the injection pipe 9 > the pressure in the auxiliary oil tank 1 > 0. The lubricating oil is pressurized by the viscous pump and enters the high-pressure oil chamber 8, and then enters the injection pipe 9 connected to the high-pressure oil chamber 8. After entering the injection pipe 9, part of the lubricating oil passes through the spray slit to lubricate and cool the sliding rotor 11 and the guide bearing shell 10. Finally, it flows back to the main oil tank 4 through the return oil hole 16 and enters the next cycle after being cooled by the oil cooler 5 in the main oil tank 4. The auxiliary oil tank 1 and the frame 17 are welded together. When designing the volume of the auxiliary oil tank 1, it is necessary to ensure that after the auxiliary oil tank 1 is filled, the liquid level in the main oil tank 4 drops to the lower plane of the guide bearing bearing 10, thereby avoiding immersion and oil agitation. Therefore, another part of the lubricating oil flows into the auxiliary oil tank 1 through the oil injection pipe 9, continuously supplying oil to the auxiliary oil tank 1. After the auxiliary oil tank 1 is filled with lubricating oil, the liquid level in the main oil tank 4 drops to the lower plane of the guide bearing bearing 10. However, the existing technology uses an internal circulation immersion spray oil supply structure. Because the liquid level submerges the guide bearing 10, it is immersed in lubricating oil. The oil level is high. When the sliding rotor 11 rotates with the main shaft 15, the lubricating oil is not only violently agitated and tumbled, easily forming a large amount of oil mist, but the oil mist also diffuses with the airflow inside the assembly and adheres to the surface of the stator and rotor windings, thus contaminating the stator and rotor. Moreover, when the rotating parts rotate at high speed, they need to overcome the viscous resistance of the oil to agitate the oil, resulting in a large amount of agitation loss.

[0025] Compared with the prior art, the self-circulating oil circuit of this invention does not require an external pump to provide power. The lubricating oil is sprayed directly onto the sliding rotor 11 and the guide bearing 10, providing precise oil supply and cooling. At the same time, the setting of the auxiliary oil tank 1 lowers the liquid level of the main oil tank 4, bringing the lubricating oil level that originally submerged the guide bearing 10 to below the guide bearing 10. The low liquid level reduces the stirring loss between the sliding rotor 11 and the lubricating oil, fundamentally reducing the generation of oil mist. Furthermore, the setting of the auxiliary oil tank 1 ensures that the bearing lubrication returns to the traditional immersion operation state under low speed conditions, ensuring the operational reliability of the guide bearing 10.

[0026] Example 2 This embodiment further elaborates and supplements the implementation of the present invention based on Embodiment 1.

[0027] When the unit speed decreases, the lubricating oil in the auxiliary oil tank 1 is supplied to the spray slit in reverse through the oil injection pipe 9. When the unit speed decreases to a certain level, the pressure head of the viscous pump is almost zero, and the flow rate of the lubricating oil in the main oil tank 4 into the high-pressure oil chamber 8 decreases. In some cases, the amount of oil entering the oil injection pipe 9 is less than the amount of oil flowing out of the spray slit, which cannot meet the flow rate requirements of the spray slit. At this time, the pressure in the auxiliary oil tank 1 is about 0. Under the action of the liquid level difference between the auxiliary oil tank 1 and the main oil tank 4, the auxiliary oil tank 1 supplies oil to the oil injection pipe 9 in reverse to meet the flow rate requirements of the spray slit and ensure the cooling and lubrication of the guide bearing shell 10 and the sliding rotor 11.

[0028] When the unit is shut down, the liquid level in the auxiliary oil tank 1 gradually decreases until the liquid level in the auxiliary oil tank 1 is the same as the liquid level in the main oil tank 4, which is the shutdown oil level. When the unit is restarted, the guide bearing 10 is in a semi-immersed state during the start-up and low speed stages. After stable operation, the liquid level in the main oil tank 4 is pulled down to the lower plane of the guide bearing 10.

[0029] Example 3 This embodiment further elaborates and supplements the implementation of the present invention based on Embodiment 1 or Embodiment 2.

[0030] The circumferential gap between the guide bearing support ring 3 and the sliding rotor 11 is 0.5 to 1 mm to ensure that the pressure and oil flow in the high-pressure oil chamber 8 are reduced. Moreover, the circumferential gap is not less than the gap between the guide bearing pad 10 and the sliding rotor 11 to prevent the guide bearing support ring 3 from playing the role of the guide bearing pad 10.

[0031] The height of the annular gap 7 between the oil guide plate 6 and the lower plane of the sliding rotor 11 is 4 to 6 mm. Controlling the gap height within the range of 4 to 6 mm can avoid the problem of reduced flow rate and pressure head due to excessively large or small gaps.

[0032] The auxiliary oil tank 1 is provided with an oil drain hole 14 at the bottom, and the auxiliary oil tank 1 is connected to the main oil tank 4 through the oil drain hole 14. The oil injection pipe 9 is connected to the auxiliary oil tank 1. When the unit speed decreases, the pressure head of the viscous pump drops to a level lower than the pressure head caused by the liquid level difference between the auxiliary oil tank 1 and the main oil tank 4. The lubricating oil in the auxiliary oil tank 1 flows back into the oil injection pipe 9 to supply oil to the spray nozzle, and finally flows back into the main oil tank 4 through the oil return hole 16. During maintenance, the oil drain hole 14 located at the bottom of the auxiliary oil tank 1 can slowly drain the lubricating oil in the auxiliary oil tank, thereby ensuring that there is no stagnant oil in the auxiliary oil tank that cannot be drained during unit maintenance.

[0033] Multiple exhaust and air supply pipes 13 are evenly distributed along the circumference of the auxiliary oil tank 1. During normal operation of the unit, the second lubricating oil from the oil injection pipe 9 continuously supplies oil to the auxiliary oil tank 1. After the auxiliary oil tank 1 is full of oil, the liquid level in the main oil tank 4 drops to the lower plane of the guide bearing bearing 10. The filled oil leaks out from the exhaust and air supply pipes 13 and the oil drain hole 14. The oil leaking from the exhaust and air supply pipes 13 flows between the guide bearing bearing 10, flows from the oil return hole 16 to the main oil tank 4, and the oil passing through the oil drain hole 14 flows directly back to the main oil tank 4, maintaining the auxiliary oil tank 1 without gas accumulation and always keeping it in a state of full lubricating oil, thereby ensuring that the liquid level in the main oil tank 4 is at the lower plane of the guide bearing bearing 10, so that the guide bearing bearing is in a low liquid level operating state.

[0034] The fuel injection pipe 9 is connected to the auxiliary fuel tank 1 via flange 12, and the fuel inlet of flange 12 is eccentrically designed.

[0035] The cross-sectional area of ​​the return oil hole 16 is 2 to 4 times the flow area of ​​the spray pipe 9. The sufficiently large cross-sectional area allows the lubricating oil after spraying to flow back quickly to the outer diameter side of the main oil tank 4, avoiding the accumulation of lubricating oil in the area of ​​the guide bearing 10 and raising the oil level, ensuring that the liquid level in the main oil tank 4 is stably maintained at the lower plane of the guide bearing 10. Furthermore, by enlarging the cross-sectional area of ​​the return oil hole 16, the flow velocity is reduced, ensuring that the flow velocity of the lubricating oil at the return oil hole 16 is less than 1 m / s. The lubricating oil flows back to the main oil tank 4 in a smooth state, without impacting the liquid surface in the main oil tank 4, without causing oil to tumble and splash, and reducing the generation of oil mist during oil return.

[0036] Example 4 This embodiment further elaborates and supplements the implementation of the present invention based on Embodiment 3.

[0037] This embodiment, as a preferred embodiment, provides a self-circulating low-level spray guide bearing structure, including an auxiliary oil tank 1, a bearing rear support ring 2, a guide bearing support ring 3, a main oil tank 4, an oil cooler 5, an oil guide plate 6, a guide bearing bearing 10, and a sliding rotor 11 that rotates with the main shaft 15. Both the rear support ring 2 and the guide bearing support ring 3 are integral ring structures. The guide bearing 10 is assembled on the guide bearing support ring 3. Multiple guide bearing 10s are evenly arranged along the circumference of the guide bearing support ring 3, and the guide bearing support ring 3 provides axial support for the guide bearing 10. The guide bearing support ring 3 is connected to the bottom of the rear support ring 2, and the rear support ring 2 provides radial support for the guide bearing 10. The bottom of the guide bearing support ring 3 is connected to the oil guide plate 6. The oil guide plate 6 is arranged opposite to the lower plane of the sliding rotor 11, forming an annular gap 7 between them. The height of the annular gap 7 is 4 to 6 mm. When the sliding rotor 11 moves relative to the oil guide plate 6, the annular gap 7 forms a viscous pump. The circumferential gap between the guide bearing support ring 3 and the sliding rotor 11 is 0.5 to 1 mm, and the circumferential gap is not less than the gap between the guide bearing shell 10 and the sliding rotor 11. The oil guide plate 6, the guide bearing support ring 3, and the sliding rotor 11 together form an annular high-pressure oil chamber 8. An oil injection pipe 9 is provided between adjacent guide bearing bearings 10. One end of the high-pressure oil chamber 8 is connected to the oil injection pipe 9, and the other end of the oil injection pipe 9 is connected to the auxiliary oil tank 1. The oil injection pipe 9 is provided with spray slits that face the oil inlet and outlet edges of the sliding rotor 11 and the guide bearing bearings 10. like Figure 4 As shown, during normal operation, the sliding rotor 11 rotates with the main shaft 15. The annular gap 7 between the lower plane of the sliding rotor 11 and the oil guide plate 6 forms a viscous pump due to the movement of the sliding rotor 11 relative to the oil guide plate 6. The lubricating oil in the main oil tank 4 is pressurized under the action of the viscous pump, providing power for the oil circuit circulation. During normal operation, the pressure in the high-pressure oil chamber 8 is greater than the pressure in the injection pipe 9, which is greater than the pressure in the auxiliary oil tank 1, which is greater than 0. The lubricating oil is pressurized by the viscous pump and enters the high-pressure oil chamber 8. Then it enters the injection pipe 9, which is connected to the high-pressure oil chamber 8. After entering the injection pipe 9, part of the lubricating oil passes through the spray slit to lubricate and cool the sliding rotor 11 and the guide bearing 10. Finally, it flows back to the main oil tank 4 through the return oil hole 16. After being cooled by the oil cooler 5 in the main oil tank 4, it enters the next cycle. The auxiliary oil tank 1 is provided with an oil drain hole 14 at the bottom, which is connected to the main oil tank 4. Multiple exhaust and air supply pipes 13 are evenly distributed in the circumferential direction of the auxiliary oil tank 1. Another part of the lubricating oil is continuously supplied to the auxiliary oil tank 1 through the oil injection pipe 9. After the auxiliary oil tank 1 is full of oil, the full oil leaks out from the exhaust and air supply pipes 13 and the oil drain hole 14. The oil leaking from the exhaust and air supply pipes 13 flows between the guide bearing shells 10 and flows from the return oil hole 16 to the main oil tank 4. The oil passing through the oil drain hole 14 flows directly back to the main oil tank 4, maintaining that there is no gas accumulation in the auxiliary oil tank 1 and that it is always in a state of full lubricating oil, thereby ensuring that the liquid level in the main oil tank 4 is below the plane of the guide bearing shells 10, so that the guide bearing shells are in a low liquid level operating state.

[0038] like Figure 5As shown, when the unit speed gradually decreases, the lubricating oil in the auxiliary oil tank 1 is supplied in reverse to the spray nozzle through the injection pipe 9. When the unit speed drops to a certain level, the pressure head of the viscous pump is almost zero, and the flow rate of the lubricating oil in the main oil tank 4 into the high-pressure oil chamber 8 decreases, even to the point that the amount of oil entering the injection pipe 9 is less than the amount of oil flowing out of the spray nozzle, which cannot meet the flow requirements of the spray nozzle. At this time, the pressure in the auxiliary oil tank 1 is about 0. Under the action of the liquid level difference between the auxiliary oil tank 1 and the main oil tank 4, the auxiliary oil tank 1 supplies oil in reverse to the injection pipe 9 to meet the flow requirements of the spray nozzle, and finally flows back to the main oil tank 4 through the return oil hole 16. During maintenance, the drain hole 14 located at the bottom of the auxiliary oil tank 1 can slowly drain the lubricating oil in the auxiliary oil tank, thereby ensuring that there is no stagnant oil in the auxiliary oil tank that cannot be drained during unit maintenance.

[0039] When the unit is shut down, the liquid level in the auxiliary oil tank 1 gradually decreases until the liquid level in the auxiliary oil tank 1 is the same as the liquid level in the main oil tank 4, which is the shutdown oil level. When the unit is restarted, the guide bearing 10 is in a semi-immersed state during the start-up and low speed stages. After stable operation, the liquid level in the main oil tank 4 decreases to the lower plane of the guide bearing 10.

Claims

1. A self-circulating low-level spray guide bearing structure, comprising a bearing support ring (2), a guide bearing support ring (3), a main oil groove (4), an oil cooler (5), an oil guide plate (6), a guide bearing bearing (10), and a sliding rotor (11) that rotates with the main shaft (15), characterized in that: It also includes an auxiliary fuel tank (1) and a fuel injection pipe (9); Both the rear support ring (2) and the guide bearing support ring (3) are integral ring structures. The guide bearing pad (10) is assembled on the guide bearing support ring (3). Multiple guide bearing pads (10) are evenly arranged along the circumferential direction of the guide bearing support ring (3), and the guide bearing support ring (3) provides axial support for the guide bearing pad (10). The guide bearing support ring (3) is connected to the bottom of the rear support ring (2), and the rear support ring (2) provides radial support for the guide bearing pad (10). The bottom of the guide bearing support ring (3) is connected to the oil guide plate (6). The oil guide plate (6) is set opposite to the lower plane of the sliding rotor (11), and a small annular gap (7) is formed between them. When the sliding rotor (11) moves relative to the oil guide plate (6), the small annular gap (7) forms a viscous pump. The oil guide plate (6), the guide bearing support ring (3), and the sliding rotor (11) together form an annular high-pressure oil chamber (8). An oil spray pipe (9) is provided between adjacent guide bearing bearings (10). One end of the high-pressure oil chamber (8) is connected to the oil spray pipe (9), and the other end of the oil spray pipe (9) is connected to the auxiliary oil tank (1). The oil spray pipe (9) is provided with a spray slit for spraying lubricating oil toward the surface of the sliding rotor (11) and the oil inlet and outlet of the guide bearing bearing (10). When the unit is running, the lubricating oil in the main oil tank (4) is pressurized by the viscous pump and enters the high-pressure oil chamber (8). The lubricating oil in the high-pressure oil chamber (8) is divided into two paths by the oil spray pipe (9). One path of lubricating oil acts on the sliding rotor (11) and the guide bearing (10) through the spray gap. It flows into the main oil tank (4) through multiple oil return holes (16) that are evenly opened on the lower circumference of the bearing support ring (2) and communicate with the main oil tank (4). The lubricating oil on the outer diameter side of the main oil tank (4) is cooled by the oil cooler (5) and flows to the inner diameter side of the main oil tank (4). After being pressurized by the viscous pump, it enters the high-pressure oil chamber (8) to enter the next cycle. The other path of lubricating oil flows continuously into the auxiliary oil tank (1) through the oil spray pipe (9). The liquid level in the main oil tank (4) is reduced to the lower plane of the guide bearing (10).

2. The self-circulating low-level spray guide bearing structure as described in claim 1, characterized in that: After the auxiliary oil tank (1) is filled with lubricating oil, the liquid level in the main oil tank (4) drops to the lower plane of the guide bearing shell (10).

3. The self-circulating low-level spray guide bearing structure as described in claim 2, characterized in that: When the unit speed decreases, the lubricating oil in the auxiliary oil tank (1) is supplied to the spray gap in the reverse direction through the oil injection pipe (9).

4. The self-circulating low-level spray guide bearing structure as described in claim 3, characterized in that: When the unit is shut down, the liquid level in the auxiliary oil tank (1) gradually decreases until the liquid level in the auxiliary oil tank (1) is level with the liquid level in the main oil tank (4). When the unit is turned around again, the guide bearing (10) is in a semi-immersed state during the start-up and low speed stages. After stable operation, the liquid level in the main oil tank (4) decreases to the lower plane of the guide bearing (10).

5. A self-circulating low-level spray guide bearing structure as described in any one of claims 1-4, characterized in that: The circumferential gap between the guide bearing support ring (3) and the sliding rotor (11) is 0.5 to 1 mm, and the circumferential gap is not less than the gap between the guide bearing bearing (10) and the sliding rotor (11).

6. A self-circulating low-level spray guide bearing structure as described in any one of claims 1-4, characterized in that: The height of the annular gap (7) between the oil guide plate (6) and the lower plane of the sliding rotor (11) is 4-6 mm.

7. A self-circulating low-level spray guide bearing structure as described in any one of claims 1-4, characterized in that: The auxiliary oil tank (1) is provided with an oil drain hole (14) at the bottom, and the auxiliary oil tank (1) is connected to the main oil tank (4) through the oil drain hole (14).

8. The self-circulating low-level spray guide bearing structure as described in claim 7, characterized in that: The auxiliary oil tank (1) has multiple exhaust and air supply pipes (13) evenly distributed in the circumferential direction.

9. A self-circulating low-level spray guide bearing structure as described in any one of claims 1-4, characterized in that: The fuel injection pipe (9) is connected to the auxiliary fuel tank (1) through a flange (12), and the oil inlet of the flange (12) is eccentrically designed.

10. A self-circulating low-level spray guide bearing structure as described in any one of claims 1-4, characterized in that: The cross-sectional area of ​​the oil return hole (16) is 2 to 4 times the flow area of ​​the oil injection pipe (9), and the flow velocity of the lubricating oil at the oil return hole (16) is less than 1 m / s.

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