Bearing respirator for reducing bearing oil mist of vertical water-turbine generator set

Abstract

The bearing respirator comprises a shell, a condensation mechanism and a conveying mechanism, a plurality of grooves are formed in the bottom of the shell, the condensation mechanism comprises a partition plate, a condensation cavity and a condensation water pipe, and the partition plate, the condensation cavity and the condensation water pipe are arranged in a working space. The partition plate is arranged in the condensation cavity and divides the condensation cavity into an oil return area and a condensation area, the condensation area is communicated with the oil return area, a labyrinth condensation channel is arranged in the condensation area, a breathing pipe is arranged at the top of the condensation cavity and penetrates through the shell to be communicated with the outside, and the conveying mechanism comprises a drainage box, a plurality of drainage grooves, a breathing pipe, an air inlet pipe, an air outlet pipe, an oil inlet pipe and an oil return pipe. The labyrinth condensation channel of the condensation area is connected with the bearing seat through the air inlet pipe and the air outlet pipe to form a gas circulation loop. The bearing respirator for reducing the oil mist of the bearing of the vertical water-turbine generator set has the advantages of being high in oil return efficiency and smooth in respiration.

Description

Technical Field

[0001] This invention relates to the field of generator set auxiliary equipment technology, and in particular to a bearing breather for reducing oil mist in the bearings of vertical hydro-generator sets. Background Technology

[0002] In vertical hydro-generator sets, bearings such as thrust bearings and guide bearings generate heat through friction during operation, causing the lubricating oil temperature to rise, typically reaching 50-65℃, and even exceeding 70℃ under some conditions. At this temperature, some lubricating oil evaporates, forming an oil-gas mixture. Over time, the oil-gas concentration inside the bearing housing gradually increases. To balance the pressure inside and outside the bearing housing and prevent excessive pressure leading to lubricating oil leakage from the sealing gaps, a breather is needed to expel the oil-gas. Breathers are often simple filter structures, only filtering impurities from the oil-gas through the filter element, without effectively cooling the oil-gas. Lubricating oil vapor is lost with the gas, increasing lubricating oil consumption and requiring frequent oil replenishment. Adding a condenser structure results in a short residence time of oil-gas in the condensation zone, low cooling efficiency, limited return flow, and increased breathing resistance, affecting the pressure balance inside the bearing housing. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a bearing breather for reducing oil mist in the bearings of vertical hydro-generator sets. This bearing breather for reducing oil mist in the bearings of vertical hydro-generator sets has the advantages of high oil return efficiency and smooth breathing.

[0004] A bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to an embodiment of the present invention includes a housing, a condensation mechanism, and a conveying mechanism. The bottom of the housing is provided with multiple grooves. The housing is connected to the outer side of the bearing seat of the vertical hydro-generator unit via a base. The housing and the base enclose a working space. The condensation mechanism includes a partition, a condensation chamber, and a condensate pipe arranged within the working space. The condensate pipe surrounds the outer wall of the condensation chamber to cool it. The partition is arranged within the condensation chamber and divides it into an oil return zone and a condensation zone. The condensation zone is connected to the oil return zone. A labyrinthine condensation channel is arranged within the condensation zone. A breathing tube is installed at the top of the condensation chamber, passing through the outer shell and communicating with the outside. A breathing valve is installed on the breathing tube. The delivery mechanism includes a drainage box, multiple drainage channels, an air inlet pipe, an air outlet pipe, an oil inlet pipe, and an oil return pipe. The air inlet pipe and the air outlet pipe connect the labyrinth condensation channel of the condensation zone to the bearing seat to form a gas circulation loop. The drainage box and multiple drainage channels are arranged in the oil return zone. The first end of the oil inlet pipe passes through the outer shell through a groove and is connected to the bearing seat. The second end of the oil inlet pipe is connected to the drainage box. One end of the oil return pipe passes through the outer shell through a groove and is connected to the bearing seat. The other end of the oil return pipe is connected to the drainage channel.

[0005] The bearing breather for reducing oil mist in vertical hydro-generator bearings according to embodiments of the present invention has the advantages of high oil return efficiency and smooth breathing. This application has the following advantages: extending oil-gas condensation time, introducing active cooling, improving oil return efficiency, and ensuring smooth breathing.

[0006] In some embodiments, the bottom of the breathing tube is provided with an installation sleeve and a temperature elastic plate. The installation sleeve is fitted onto the breathing tube, and the temperature elastic plate abuts against the end of the breathing tube and changes the distance between the end of the breathing tube and the end of the breathing tube as the temperature changes.

[0007] In some embodiments, the mounting sleeve is provided with a filter screen.

[0008] In some embodiments, the filter screen is a porous metal mesh.

[0009] In some embodiments, the labyrinthine condensation channel includes a plurality of corrugated plates, a group of corrugated plates includes a plurality of corrugated plates arranged at equal intervals in the vertical direction, multiple groups of corrugated plates are arranged at equal intervals in the horizontal direction, and each group of corrugated plates is staggered from any adjacent group of corrugated plates in the vertical direction by a certain interval.

[0010] In some embodiments, the drainage box is provided with a plurality of first drainage holes, and a plurality of drainage channels are arranged below the drainage box to receive oil droplets. The plurality of drainage channels are distributed vertically to receive oil from above in sequence, and the bottommost drainage channel transports the oil droplets to the return oil pipe.

[0011] In some embodiments, the drainage channel includes a first drainage channel and a second drainage channel. A plurality of the first drainage channels are arranged below the drainage box. A second drainage hole is provided on the wall of the first drainage channel. The second drainage channel is located below the first drainage channel to receive oil droplets from the first drainage hole. The second drainage channel is connected to the return oil pipe.

[0012] In some embodiments, a one-way valve is provided in the outlet pipe to prevent gas backflow.

[0013] In some embodiments, the condensate pipe is a coil structure, which is arranged between the outer shell and the condensation chamber. The coil structure has an inlet pipe and an outlet pipe at one end of the condensation chamber, and the inlet pipe and the outlet pipe respectively pass through the outer shell and are connected to the cooling water tank.

[0014] In some embodiments, an ultrasonic cavitation device is also included, which is arranged between the air intake pipe and the labyrinth condensation channel to gather oil mist particles. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the bottom structure of a bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the external structure of the condensation chamber of the bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to an embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the condensation chamber connection structure of the bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to an embodiment of the present invention.

[0019] Figure 5 This is a schematic cross-sectional view of the condensation chamber of a bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit, according to an embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram of the condensation channel of the bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to an embodiment of the present invention.

[0021] Figure 7 This is a schematic diagram of the condensate pipe of the bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to an embodiment of the present invention.

[0022] Figure 8 This is a schematic diagram of the oil return zone of the bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to an embodiment of the present invention.

[0023] Figure 9 This is a schematic diagram of the structure of the temperature elastic sheet of the bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to an embodiment of the present invention.

[0024] Figure 10 This is a schematic diagram of the installation sleeve of the bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to an embodiment of the present invention.

[0025] Figure 11 This is a schematic diagram of the corrugated plate of the bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to an embodiment of the present invention.

[0026] Figure 12 This is a schematic diagram comparing the temperature changes of the temperature elastic sheet of the bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to an embodiment of the present invention.

[0027] Reference numerals: 1. Outer shell; 2. Base; 3. Groove; 4. Condensation chamber; 5. Water inlet pipe; 6. Water outlet pipe; 7. Condensate pipe; 8. Partition plate; 9. Oil return zone; 10. Labyrinth condensation channel; 11. Oil inlet pipe; 12. Oil return pipe; 13. Drainage box; 14. First drainage hole; 15. First drainage groove; 16. Second drainage hole; 17. Second drainage groove; 18. Air inlet pipe; 19. Air outlet pipe; 20. Corrugated plate; 21. Breathing pipe; 22. Mounting sleeve; 23. Filter screen; 24. Temperature elastic sheet. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] According to an embodiment of the present invention, a bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit includes a housing 1, a condensation mechanism, and a conveying mechanism. The bottom of the housing 1 is provided with multiple grooves 3. The housing 1 is connected to the outer side of the bearing seat of the vertical hydro-generator unit via a base 2. The housing 1 and the base 2 enclose a working space. The condensation mechanism includes a partition 8, a condensation chamber 4, and a condensate pipe 7 arranged within the working space. The condensate pipe 7 surrounds the outer wall of the condensation chamber 4 to cool it. The partition 8 is arranged within the condensation chamber 4 and divides it into an oil return zone 9 and a condensation zone. The condensation zone and the oil return zone 9 are connected. A labyrinthine condensation channel 10 is arranged within the condensation zone. The condensation chamber 4... The top is equipped with a breathing tube 21 that passes through the outer shell 1 and connects to the outside. A breathing valve is installed on the breathing tube 21. The delivery mechanism includes a drainage box 13, multiple drainage grooves, an air inlet pipe 18, an air outlet pipe 19, an oil inlet pipe 11, and an oil return pipe. The air inlet pipe 18 and the air outlet pipe 19 connect the labyrinth condensation channel 10 of the condensation zone to the bearing seat to form a gas circulation loop. The drainage box 13 and multiple drainage grooves are arranged in the oil return zone 9. The first end of the oil inlet pipe 11 passes through the groove 3 and exits the outer shell 1 to connect with the bearing seat. The second end of the oil inlet pipe 11 is connected to the drainage box 13. One end of the oil return pipe 12 passes through the groove 3 and exits the outer shell 1 to connect with the bearing seat. The other end of the oil return pipe 12 is connected to the drainage groove.

[0030] The multiple grooves 3 on the bottom of the outer casing 1 allow for the simultaneous routing of the oil inlet pipe 11, oil return pipe 12, air inlet pipe 18, and air outlet pipe 19. For example, the outer casing 1 is a cuboid, with a groove 3 located at each of the four corners of its bottom. Each of the four pipes originates from one of these grooves 3. The grooves 3 prevent exposed pipe bends, reducing oil and gas flow resistance and improving oil and gas flow compared to an exposed layout, thus ensuring pressure balance in the bearing housing. The outer casing 1 and base 2 work together to prevent external dust and moisture from entering the working space, improving the cleanliness of the equipment's operating environment.

[0031] The baffle 8 separates the condensation chamber 4 into the oil return zone 9 and the condensation zone, realizing the functional separation of "oil and gas condensation - oil droplet recovery", avoiding uncondensed oil and gas from directly entering the oil return system and improving the oil mist treatment efficiency.

[0032] The condensate pipes 7 are arranged around the outer wall of the condensation chamber 4 to form a uniform annular cooling zone. Compared with local cooling, the temperature distribution deviation inside the condensation chamber 4 can be controlled within ±2℃, ensuring stable oil mist condensation effect.

[0033] The labyrinthine condensation channel 10 extends the oil and gas flow path through complex channels, increasing the contact time and area between the oil and gas and the condensation wall. Combined with the low-temperature environment, this improves the oil mist condensation rate and reduces the oil content in the exhaust gas. The breather tube 21 helps balance the air pressure inside and outside the bearing housing, preventing excessive pressure from causing lubricating oil leakage. The breather valve can automatically adjust its opening according to the internal pressure, ensuring air pressure balance while reducing the interference of a large influx of outside air on the condensation temperature field.

[0034] When the bearing housing is working, as the oil mist continuously condenses, uncondensed gas gradually accumulates in the condensation chamber 4, causing the pressure inside the chamber to rise. When the pressure rises to a certain level, exceeding the resistance of the exhaust pipe 19 or reaching equilibrium with the external pressure, the uncondensed gas will be discharged through the exhaust pipe 19. During the exhaust process, the pressure inside the condensation chamber 4 will gradually decrease until the next gas accumulation causes the pressure to rise again.

[0035] The bearing breather for reducing oil mist in vertical hydro-generator bearings according to embodiments of the present invention has the advantages of high oil return efficiency and smooth breathing. This application has the following advantages: extending oil-gas condensation time, introducing active cooling, improving oil return efficiency, and ensuring smooth breathing.

[0036] In some embodiments, a mounting sleeve 22 and a temperature elastic sheet are provided at the bottom of the breathing tube 21. The mounting sleeve 22 is sleeved on the breathing tube 21, and the temperature elastic sheet abuts against the end of the breathing tube 21 and changes the distance between the end of the breathing tube 21 and the end of the breathing tube 21 with temperature changes.

[0037] Specifically, the mounting sleeve 22 adopts a ring-shaped sleeve structure. The mounting sleeve 22 can be connected to the outer wall of the breathing tube 21 via threaded connection, snap-fit ​​connection, etc., ensuring stable assembly while facilitating disassembly and maintenance. A reference line can be set at the bottom of the mounting sleeve 22 to provide an installation and deformation reference for the temperature elastic plate. The temperature elastic plate is a frustum-shaped thin sheet made of shape memory alloy (such as nickel-titanium alloy). The edge of the temperature elastic plate is fixed to the support edge of the mounting sleeve 22, and the central area maintains a slight gap with the end of the breathing tube 21. This ensures gas flow while reducing direct oil mist escape. The temperature elastic plate contracts vertically according to temperature changes, deforming to different degrees at different temperatures to change the distance from the end of the breathing tube 21, thus adjusting the airflow.

[0038] The temperature elastic plate contracts with temperature changes, fully opening above 60℃ and partially closing below 30℃. It can automatically adjust the opening of the breather tube 21 according to the oil and gas volume, ensuring smooth exhaust when the oil and gas volume is high and reducing heat loss when the oil and gas volume is low, thus improving energy efficiency. The temperature elastic plate adapts to the oil mist volume changes under different loads of the unit.

[0039] In some embodiments, the mounting sleeve 22 is fitted with a filter screen 23.

[0040] Specifically, the filter 23 is designed to filter out residual solid impurities in oil and gas with a filtration efficiency of up to 90%, preventing impurities from being discharged with the breathing tube 21 and polluting the environment. Combined with the detachable structure of the mounting sleeve 22, the filter 23 can be quickly replaced without disassembling the entire breathing tube 21 assembly. Maintenance can be completed by a single person, reducing maintenance time to less than 30 minutes and significantly lowering operating costs.

[0041] In some embodiments, the filter screen 23 is a porous metal mesh.

[0042] Specifically, the porous structure of the metal mesh effectively intercepts solid impurities while ensuring smooth gas flow, avoiding increased ventilation resistance in the breathing tube 21. The rigid structure of the metal material can withstand the periodic deformation impact of the temperature-sensitive elastic sheet and pressure fluctuations caused by oil and gas flow, making it less prone to damage or deformation. Its structural stability is good, and its service life is longer than that of plastic filters. The smooth and rigid metal surface allows any adhering oil to drip naturally back into the oil return zone 9 under gravity and airflow, reducing the need for manual cleaning.

[0043] In some embodiments, the labyrinth condensation channel 10 includes a plurality of corrugated plates 20, a group of corrugated plates 20 includes a plurality of corrugated plates 20 arranged at equal intervals in the vertical direction, the plurality of groups of corrugated plates 20 are arranged at equal intervals in the horizontal direction, and each group of corrugated plates 20 is staggered with any adjacent group of corrugated plates 20 at a certain interval in the vertical direction.

[0044] Specifically, the corrugated plates 20 are arranged in an alternating pattern to form a labyrinthine condensation channel, extending the residence time of oil and gas from the traditional straight channel. Combined with the drainage box 13 and the first drainage groove 15 in the return oil zone 9, this allows the condensed oil droplets to flow along an orderly path. Each group of corrugated plates 20 consists of three to five metal corrugated plates 20. The surface of the corrugated plates 20 has continuous V-shaped or sinusoidal curve pleats, increasing the condensation surface area. Adjacent groups of corrugated plates 20 are staggered vertically by a certain distance, which can be about half the distance between the inner plates of a single group, forming a labyrinthine path that is staggered vertically and responsively front and back. The staggered arrangement of the corrugated plates 20 changes the oil and gas flow path from a straight line to a continuously zigzagging "S" shape, extending the actual flow distance by 2-3 times compared to a straight channel. The corrugated surface induces airflow turbulence, increasing the forced convection heat transfer coefficient between the oil and gas and the plate wall, accelerating the condensation of oil mist into droplets. On the other hand, the corrugated plate 20 can be tilted at a certain angle relative to the horizontal plane, so that the oil droplets formed by condensation can quickly converge along the corrugated channel under the action of gravity and surface tension, drip through the gap at the bottom of the plate and flow to the drainage channel of the oil return zone 9 to reduce the risk of secondary atomization of oil droplets.

[0045] The labyrinthine condensation channel 10 formed by multiple corrugated plates 20 has a large condensation area, increases the amount of oil mist handled, and the staggered gaps are larger than the commonly used filter screen aperture, reducing the blockage caused by impurity accumulation. The smooth metal surface is easy to clean and has a long service life.

[0046] In some embodiments, a plurality of first drainage holes 14 are provided on the drainage box 13, and a plurality of drainage channels are arranged below the drainage box 13 to receive oil droplets. The plurality of drainage channels are distributed vertically to receive the oil above in sequence, and the bottommost drainage channel transports the oil droplets to the return oil pipe 12.

[0047] Specifically, the drainage box 13 is horizontally arranged at the top of the oil return zone 9 and directly connected to the oil inlet pipe 11 to receive the lubricating oil from the oil inlet pipe 11. The edge of the first drainage hole 14 is rounded to prevent oil droplets from adhering to the wall. Multiple first drainage holes 14 disperse the oil, allowing oil vapor to enter the oil return zone 9 evenly, preventing local oil droplet aggregation and the formation of large oil flows that could impact the lower part of the zone and cause oil overflow. The drainage channel can be arranged in two or more layers in the vertical direction. The projection range of the upper drainage channel completely covers the lower layer, forming a funnel-shaped receiving structure that is wider at the top and narrower at the bottom. The uppermost drainage channel directly corresponds to the area below the first drainage hole 14 of the drainage box 13, and the end of the lowermost drainage channel is connected to the oil return pipe 12 to return the cooled oil. The drainage channel can be a rectangular channel, and the lowermost drainage channel can be inclined towards the oil return pipe 12 to accelerate the flow of oil droplets by gravity. The inner side of the drainage channel wall is polished to reduce oil droplet adhesion.

[0048] In some embodiments, the drainage channel includes a first drainage channel 15 and a second drainage channel 17. A plurality of first drainage channels 15 are arranged below the drainage box 13. A second drainage hole 16 is provided on the wall of the first drainage channel 15. The second drainage channel 17 is located below the first drainage channel 15 to receive oil droplets from the first drainage hole 14. The second drainage channel 17 is connected to the return oil pipe 12.

[0049] Specifically, the extension direction of the multiple first drainage channels 15 is perpendicular to the extension direction of the drainage box 13. The multiple first drainage channels 15 are arranged in a parallel array directly below the drainage box 13 to ensure that they can completely receive the oil droplets dripping from the first drainage hole 14 of the drainage box 13. Second drainage holes 16 are opened at both ends of the first drainage channels 15. The second drainage holes 16 can be tilted to ensure that the oil droplets in the channel can flow out naturally along the orifice after accumulating to a certain height, avoiding the oil overflowing in the channel; the tilted orifice reduces the oil droplet residue on the wall and improves the diversion efficiency.

[0050] The second drainage channel 17 is horizontally positioned directly below all the first drainage channels 15, with its length covering the projected area of ​​all the first drainage channels 15. This ensures that oil droplets flowing from the second drainage hole 16 of each first drainage channel 15 can accurately fall into the channel. The bottom surface of the channel is inclined at a 4-6° angle to the horizontal plane, with the inclination direction facing the return oil pipe 12 interface. Gravity accelerates the oil flow, and the second drainage channel 17 is used to collect oil droplets from the first drainage channels. A filter screen can be installed between the second drainage channel 17 and the return oil pipe 12 to intercept small impurities and prevent blockage of the return oil pipe 12. The first drainage channels 15 can buffer the impact force of oil droplets, preventing them from splashing directly downwards. The oil slowly flows into the second drainage channel 17 through the second drainage hole 16, maintaining a "low flow rate, low impact" state.

[0051] In some embodiments, a one-way valve is provided in the gas outlet pipe 19 to prevent gas backflow.

[0052] Specifically, when the unit is shut down or operating at low load, the air pressure inside the condenser chamber 4 may be lower than the outside atmospheric pressure. The one-way valve effectively prevents outside air (including dust, water vapor, and impurities) from flowing back into the condenser chamber 4 and the bearing housing. If air enters in reverse, the dust will mix with the lubricating oil, accelerating its deterioration. The water vapor in the air will emulsify the lubricating oil, affecting the bearing lubrication effect and increasing the risk of wear. The one-way valve ensures the unidirectional flow of oil and gas, maintaining a slightly positive pressure inside the condenser chamber 4.

[0053] In some embodiments, the condensate pipe 7 is a coil structure, which is arranged between the outer shell 1 and the condensation chamber 4. The coil structure has an inlet pipe 5 and an outlet pipe 6 at one end of the condensation chamber 4. The inlet pipe 5 and the outlet pipe 6 pass through the outer shell 1 and are connected to the cooling water tank.

[0054] Specifically, the coil structure consists of a pipe with multiple bends, arranged around the condenser chamber 4 and kept in close contact with its outer wall. The condensate pipes 7 of the coil structure are distributed within the interlayer of the condenser chamber 4, doubling the heat exchange area compared to a straight pipe structure. This allows for sufficient heat exchange between the condensate pipes 7 and the oil and gas within the condenser chamber 4. The larger heat exchange area means more contact opportunities, enabling more effective absorption of heat from the oil and gas and promoting the condensation of lubricating oil vapor. The inlet pipe 5 and outlet pipe 6 extend through the outer shell 1 and connect to the cooling water tank. Low-temperature water from the cooling water tank enters the condensate pipes 7 via the inlet pipe 5, forming a continuous cooling cycle with the water temperature stabilized at 20-25℃. This continuous cooling cycle provides a stable cold source for the condensation process, ensuring the stability of the condensation effect.

[0055] In some embodiments, an ultrasonic cavitation device is also included, which is arranged between the intake pipe 18 and the labyrinth condensation channel 10 to gather oil mist particles.

[0056] Specifically, the ultrasonic cavitation device uses a 28kHz high-frequency piezoelectric ceramic plate as the ultrasonic sound-generating unit. The ceramic plate is fixed to the inner wall of the connection section between the air inlet pipe 18 and the labyrinthine condensation channel 10 by a metal bracket, and is arranged perpendicular to the airflow direction to ensure that the ultrasonic energy can be uniformly applied to the flowing oil mist. The ultrasonic waves propagate in the oil mist-containing airflow, generating periodic pressure fluctuations, which cause multiple cavitation bubbles to form in the airflow. After bursting, these bubbles impact the oil mist particles, causing the tiny oil mist particles to move violently and irregularly, breaking the stable dispersion state between particles and forcing them to approach and collide with each other. The high-frequency vibration reduces the surface tension of the oil droplets, reducing the repulsive force between particles, making it easier for the collided particles to merge. As a result, the oil mist particles gather and merge to form larger oil mist particles, which are more easily captured, condensed, and settled. This shortens the condensation time, reduces the condensation load, and reduces the retention loss of oil and gas in the channel.

[0057] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0061] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A bearing breather for reducing oil mist in the bearings of a vertical hydro-generator set, characterized in that, include: The outer casing has multiple grooves on its bottom. The outer casing is connected to the outer side of the bearing seat of the vertical hydro-generator unit via a base. The outer casing and the base together form a working space. A condensing mechanism includes a partition, a condensing chamber, and a condensing water pipe arranged within the working space. The condensing water pipe surrounds the outer wall of the condensing chamber to cool it. The partition is arranged inside the condensing chamber and divides it into an oil return zone and a condensing zone. The condensing zone is connected to the oil return zone. A labyrinthine condensing channel is arranged within the condensing zone. A breather pipe is installed at the top of the condensing chamber, passing through the outer shell and communicating with the outside. A breather valve is installed on the breather pipe. The conveying mechanism includes a flow box, multiple flow channels, an air inlet pipe, an air outlet pipe, an oil inlet pipe, and an oil return pipe. The air inlet pipe and the air outlet pipe connect the labyrinth condensation channel of the condensation zone to the bearing housing to form a gas circulation loop. The flow box and the multiple flow channels are arranged in the oil return zone. The first end of the oil inlet pipe passes through the outer shell through a groove and is connected to the bearing housing. The second end of the oil inlet pipe is connected to the flow box. One end of the oil return pipe passes through the outer shell through a groove and is connected to the bearing housing. The other end of the oil return pipe is connected to the flow channel.

2. The bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to claim 1, characterized in that, The bottom of the breathing tube is provided with an installation sleeve and a temperature elastic plate. The installation sleeve is fitted onto the breathing tube, and the temperature elastic plate abuts against the end of the breathing tube and changes the distance between the end of the breathing tube and the end of the breathing tube as the temperature changes.

3. The bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to claim 2, characterized in that, The mounting sleeve is equipped with a filter screen.

4. The bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to claim 3, characterized in that, The filter screen is a porous metal mesh.

5. The bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to claim 1, characterized in that, The labyrinthine condensation channel includes multiple corrugated plates. One group of corrugated plates includes multiple corrugated plates arranged at equal intervals in the vertical direction. Multiple groups of corrugated plates are arranged at equal intervals in the horizontal direction. Each group of corrugated plates is staggered with any adjacent group of corrugated plates in the vertical direction by a certain interval.

6. The bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to claim 1, characterized in that, The drainage box is provided with multiple first drainage holes, and multiple drainage channels are arranged below the drainage box to receive oil droplets. The multiple drainage channels are distributed vertically to receive the oil above in sequence, and the bottommost drainage channel transports the oil droplets to the return oil pipe.

7. The bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to claim 6, characterized in that, The drainage channel includes a first drainage channel and a second drainage channel. A plurality of first drainage channels are arranged below the drainage box. A second drainage hole is provided on the wall of the first drainage channel. The second drainage channel is located below the first drainage channel to receive oil droplets from the first drainage hole. The second drainage channel is connected to the return oil pipe.

8. The bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to claim 1, characterized in that, A one-way valve is installed in the outlet pipe to prevent gas backflow.

9. The bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to claim 1, characterized in that, The condensate pipe is a coil structure, which is arranged between the outer shell and the condensation chamber. The coil structure has an inlet pipe and an outlet pipe at one end of the condensation chamber. The inlet pipe and the outlet pipe pass through the outer shell and are connected to the cooling water tank.

10. The bearing breather for reducing oil mist in the bearings of a vertical hydro-generator unit according to claim 1, characterized in that, It also includes an ultrasonic cavitation device, which is arranged between the intake pipe and the labyrinth condensation channel to gather oil mist particles.

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