Bearing seat thin oil sealing waterproof device and lubricating system thereof

Abstract

The invention relates to the field of mechanical engineering, in particular to a bearing seat thin oil sealing waterproof device and a lubricating system thereof. The waterproof structure comprises a water retaining ring and a water throwing cover; and the water retaining ring is arranged between the roller body and the bearing seat and is fixedly connected with the end face of the roller body through a bolt. According to the multi-stage waterproof structure design, the water retaining ring with the inclined boss and the split type water throwing cover are arranged between the roller body and the bearing seat, water flow is guided to be discharged through the water outlet by centrifugal force, and external water is effectively prevented from invading the bearing seat in cooperation with an annular gap formed through dynamic rotation; the problem that a traditional sealing structure is prone to failure in a high-pressure flushing environment is solved, through the synergistic effect of dynamic oil control and the sealing assembly, the W-shaped oil grooves which are spirally distributed are formed in the shaft body, the throttling effect of the oil retainer ring and the throttling effect of the oil retainer ring are combined, a small amount of leaked oil liquid is recycled to a lubricating system through centrifugal force and gravity, and oil liquid waste and environmental pollution are reduced.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical engineering, and particularly relates to a thin oil sealed waterproof device for a bearing housing and its lubrication system. Background Art

[0002] In industrial production, bearings, as key components of mechanical equipment, directly affect the performance and lifespan of the equipment. For bearings operating in humid, water-rich or flushing-required environments, such as papermaking machinery, mining equipment, food processing machinery, etc., the waterproof performance of the bearing housing and the reliability of the lubrication system are crucial.

[0003] In the prior art, common sealing structures such as oil seals and labyrinth seals are prone to seal failure when facing high-pressure flushing or high-humidity environments, resulting in water and impurities invading the bearing housing, contaminating the lubricating oil, accelerating bearing wear. Although thin oil lubrication can provide good lubrication and heat dissipation effects, traditional systems lack effective waterproof designs. Once water enters, it will emulsify the lubricating oil, reducing the lubrication performance, and even causing bearing corrosion and jamming. After seal failure, lubricating oil and seals need to be frequently replaced, increasing downtime and maintenance costs, affecting production efficiency. Lubricating oil leakage may pollute the environment, and the treatment of water-containing lubricating oil also faces environmental protection pressure. Summary of the Invention

[0004] In order to overcome the problems of insufficient waterproofing of existing sealing structures, low reliability of lubrication systems, high maintenance costs and high environmental pollution risks, a thin oil sealed waterproof device for a bearing housing and its lubrication system are proposed.

[0005] The technical solution of the present invention is as follows: A thin oil sealed waterproof device for a bearing housing includes a roll body and a bearing housing; it also includes a waterproof structure, and the waterproof structure includes a water baffle ring and a water throwing cover;

[0006] The water baffle ring is arranged between the roll body and the bearing housing and is fixedly connected to the end face of the roll body through bolts. On the side of the water baffle ring facing the bearing housing, there is an annular boss, and the annular boss forms an inclination angle of 15° - 30° with the axis of the shaft body;

[0007] The water throwing cover is fixedly connected to the outer bearing end cover through bolts. An annular gap of 0.5 - 2 mm is formed between the inner wall of the water throwing cover and the outer wall of the boss of the water baffle ring. A drain port is opened at the bottom of the water throwing cover, and the drain port is communicated with an external water collecting device;

[0008] A sealing structure includes an oil baffle ring and an oil baffle;

[0009] The oil baffle ring is sleeved on the shaft body and is located between the bearing body and the inner bearing end cover;

[0010] The oil baffle is embedded in the inner hole of the outer bearing end cover and is in clearance fit with the outer wall of the shaft body;

[0011] The first W-shaped oil groove and the second W-shaped oil groove are respectively opened on the outer wall of the shaft body. The first W-shaped oil groove is located between the inner bearing end cover and the bearing body, and the second W-shaped oil groove is located between the outer bearing end cover and the bearing body;

[0012] The labyrinth seal is formed by the outer peripheral boss of the inner bearing end cover and the inner hole groove of the bearing seat, and includes at least 3 groups of staggered bosses and grooves to form a zigzag channel, and the channel gap is 0.5 - 1.5 mm;

[0013] The lip seal is an inner-skeleton double-lip structure and is embedded in the outer end hole of the outer bearing end cover. The lip is in interference fit with the outer wall of the shaft body, and the fit gap ≤ 0.1 mm;

[0014] For the static seal assembly, the mating surface between the inner bearing end cover and the bearing seat is sealed by the first O-ring, and the mating surface between the outer bearing end cover and the bearing seat is sealed by the second O-ring, and the mating surfaces are all coated with heat-resistant silicone-based sealant.

[0015] Further, the water baffle ring is made of stainless steel, the water throwing cover is a split stainless steel structure, the outer diameter of the boss of the water baffle ring is 5 - 10 mm larger than the inner diameter of the water throwing cover, and the inclined surface of the boss faces the drain opening of the water throwing cover.

[0016] Further, the spiral directions of the first W-shaped oil groove and the second W-shaped oil groove are opposite, the spiral lift angle is 10° - 20°, and the cross-section of the oil groove is rectangular or trapezoidal. The groove depths of the two W-shaped oil grooves are both 2 - 5 mm, the groove widths are both 5 - 10 mm, and they are both spirally distributed along the circumferential direction of the shaft body.

[0017] Further, the material of the lip seal is nitrile rubber or fluororubber, the hardness is Shore A 70 - 90, and the interference amount of the lip is 0.2 - 0.5 mm.

[0018] Further, the height of the boss of the labyrinth seal is 2 - 5 mm, the depth of the groove is 3 - 6 mm, and the radial gap between the adjacent boss and the groove is 0.5 - 1.5 mm.

[0019] Further, the inner diameter of the drain opening of the water throwing cover is 8 - 15 mm, and the axis of the drain opening is inclined downward at an angle of 5° - 15° with the horizontal plane.

[0020] Further, the outer diameter of the oil baffle ring is 2 - 5 mm larger than the inner diameter of the inner ring of the bearing body, and the thickness of the oil baffle ring is 5 - 10 mm.

[0021] Further, the materials of the first O-ring and the second O-ring are hydrogenated nitrile rubber, the hardness is Shore A70 - 80, and the cross-section diameter is 3 - 5 mm.

[0022] Furthermore, the heat-resistant silicone-based sealant has a temperature resistance range of -40°C to 200°C, a tensile strength ≥ 3 MPa, and an elongation at break ≥ 200%.

[0023] The present invention also provides a bearing housing sealing and lubricating system, which includes the bearing housing thin oil sealing and waterproofing device as described above, and also includes an oil thinning station, a pipeline system, and a monitoring system;

[0024] The oil thinning station includes an oil supply pump group, an oil tank, an oil cooler, an oil filtration system, and an oil-water separation device;

[0025] The oil supply pump group includes at least two groups of oil supply pumps, where:

[0026] The first group of oil supply pumps independently drives the lubrication points of the Yankee dryer reduction gearbox, the Yankee dryer bearings, and the vacuum couch roll bearings;

[0027] The second group of oil supply pumps drives the lubrication points of the bearing bodies on other rolls except the above-mentioned lubrication points;

[0028] The oil tank is internally partitioned into an oil inlet chamber and an oil return chamber. The oil inlet chamber is connected to each lubrication point through an oil supply main pipe, and the oil return chamber is connected to the oil return ports on each bearing housing through an oil return pipe;

[0029] The oil cooler uses a plate heat exchanger and is equipped with a temperature automatic control module. The cooling water pipeline of the oil cooler adopts a double-seal structure, including an inner rubber sealing ring and an outer metal bellows seal;

[0030] The oil filtration system includes a coarse filter, a fine filter, and a magnetic mesh filter;

[0031] The coarse filter, with a precision of 50 - 100 μm, is arranged at the inlet of the oil inlet chamber;

[0032] The fine filter, with a precision of 5 - 10 μm, is arranged on the oil supply main pipeline;

[0033] The magnetic mesh filter is arranged in the oil return chamber and is used to adsorb ferromagnetic impurities;

[0034] The oil-water separation device is connected to the oil return chamber and removes free water, emulsified water, and most of the water and gas dissolved in the oil based on the working principle of vacuum dehydration and degassing. It automatically starts when the moisture sensor detects that the moisture in the oil exceeds 0.1%, and automatically stops working until the residual moisture content is 120 ppm (0.012%), and automatically opens the bypass oil circuit;

[0035] The pipeline system includes an oil supply main pipe and an oil return pipe;

[0036] The oil supply main pipe is connected to the oil inlet of each lubrication point through an oil supply branch pipe with a flow regulating valve, and the oil inlet is located at the upper part of the bearing housing;

[0037] The return oil pipe is connected to the oil return port at the bottom of the bearing housing and communicates with the oil return chamber of the oil tank. A check valve and an oil return filter are provided on the oil return pipeline;

[0038] The monitoring system includes a sensor group and a host computer system;

[0039] The sensor group includes:

[0040] Temperature transmitters are arranged at the oil tank, the main oil supply pipe, and the oil return ports of each bearing housing;

[0041] Pressure transmitters are arranged at the outlet of the oil supply pump and each oil supply branch pipe;

[0042] Moisture sensors are arranged at the oil return chamber and the outlet of the oil-water separation device;

[0043] Level transmitters are arranged at the top of the oil tank;

[0044] The host computer system is communicatively connected to each sensor through signal lines and is configured with:

[0045] The oil temperature monitoring module. The temperature probe continuously monitors the oil outlet temperature and can automatically adjust the water supply volume of the cooling water of the oil cooler so that the oil outlet temperature does not exceed 50°C; when it is detected that the oil temperature exceeds 70°C, an alarm is triggered to prompt the operator to check the cooling device; when starting for the first time in cold seasons such as winter, when it is detected that the oil temperature is lower than 40°C, the electric heater in the oil tank will be immediately started, and the oil temperature will be heated to 40°C and then automatically stop heating.

[0046] The oil pressure monitoring module. When it is detected that the oil supply pressure is lower than 0.3 MPa, an alarm is triggered and the standby pump is switched;

[0047] The moisture monitoring module. When it is detected that the moisture in the oil return chamber exceeds 0.1%, the oil-water separation device is automatically started and closed when the moisture is lower than 0.012%;

[0048] The level monitoring module. When it is detected that the oil tank level is lower than the lower limit value, a refueling alarm is triggered.

[0049] Advantages of the present invention:

[0050] 1. Through the multi-stage waterproof structure design, a water retaining ring with inclined bosses and a split water throwing cover are arranged between the roller body and the bearing housing. The centrifugal force is used to guide the water flow to drain through the drain port, and combined with the annular gap formed by the dynamic rotation, it effectively blocks the intrusion of external moisture into the bearing housing, solving the problem that the traditional sealing structure is prone to failure in the high-pressure flushing environment;

[0051] 2. Through the synergistic effect of the dynamic oil control and sealing components, a spiral-distributed W-shaped oil groove is opened on the shaft body. Combining with the throttling effect of the oil baffle ring and the oil retaining ring, a small amount of leaked oil is recovered to the lubrication system through centrifugal force and gravity, reducing oil waste and environmental pollution. At the same time, the labyrinth seal and the lip seal form multiple barriers, cooperating with the O-ring seal and the heat-resistant silicone-based sealant, significantly improving the overall sealing performance of the bearing housing and reducing the risk of oil leakage.

[0052] 3. The integrated lubrication system accurately distributes the oil volume through the grouped oil supply pumps, the plate-type oil cooler automatically controls the oil temperature, and the multi-stage filtration and oil-water separation device ensures the oil cleanliness, solving the problems of insufficient heat dissipation and easy emulsification of the oil in the traditional thin oil lubrication, reducing the operating temperature of the bearing and extending its service life. The intelligent monitoring system real-time collects parameters such as oil temperature and oil pressure, linkage controls the start-stop of the equipment and the fault alarm, reduces the frequency of manual inspection, and improves the maintenance efficiency and the reliability of the equipment operation. Brief Description of the Drawings

[0053] Figure 1 The cross-sectional view of the present invention is shown;

[0054] Figure 2 The schematic diagram of the layout of the first centralized thin oil lubrication system of the present invention is shown;

[0055] Figure 3 The schematic diagram of the layout of the second centralized thin oil lubrication system of the present invention is shown;

[0056] Figure 4 The centralized thin oil lubrication system diagram of the present invention is shown.

[0057] The reference signs in the drawings are: 1. water baffle ring; 2. water throwing cover; 3. oil baffle ring; 4. oil retaining ring; 5. first W-shaped oil groove; 6. second W-shaped oil groove; 7. labyrinth seal; 8. lip seal; 9. first O-ring seal; 10. bearing housing; 11. oil inlet; 12. apply heat-resistant silicone-based sealant on the joint surface; 13. second O-ring seal; 14. outer bearing end cover; 15. bearing body; 16. oil return port; 17. inner bearing end cover; 18. drain port; 19. shaft body; 20. roller body. Detailed Description of the Invention

[0058] The present invention will be further described below with reference to the drawings and embodiments.

[0059] Please refer to Figure 1 , the present invention provides an embodiment: a thin oil sealed waterproof device for a bearing housing, including a roller body 20 and a bearing housing 10; and further including a waterproof structure, the waterproof structure including a water baffle ring 1 and a water throwing cover 2.

[0060] The water retaining ring 1 is arranged between the roller body 20 and the bearing housing 10 and is fixedly connected to the end face of the roller body 20 through bolts. On the side of the water retaining ring 1 facing the bearing housing 10, there is an annular boss, and the annular boss forms an inclination angle of 15° - 30° with the axis of the shaft body 19;

[0061] The water throwing cover 2 is fixedly connected to the outer bearing end cover 14 through bolts. An annular gap of 0.5 - 2 mm is formed between the inner wall of the water throwing cover 2 and the outer wall of the boss of the water retaining ring 1. A drain port 18 is opened at the bottom of the water throwing cover 2, and the drain port 18 is communicated with an external water collecting device;

[0062] The sealing structure includes an oil retaining ring 3 and an oil retaining ring 4;

[0063] The oil retaining ring 3 is sleeved on the shaft body 19 and is located between the bearing body 15 and the inner bearing end cover 17;

[0064] The oil retaining ring 4 is embedded in the inner hole of the outer bearing end cover 14 and is in clearance fit with the outer wall of the shaft body 19;

[0065] The first W-shaped oil groove 5 and the second W-shaped oil groove 6 are respectively opened on the outer wall of the shaft body 19. The first W-shaped oil groove 5 is located between the inner bearing end cover 17 and the bearing body 15, and the second W-shaped oil groove 6 is located between the outer bearing end cover 14 and the bearing body 15;

[0066] The labyrinth seal 7 is formed by the outer peripheral boss of the inner bearing end cover 17 and the inner hole groove of the bearing housing 10, and includes at least 3 groups of staggered bosses and grooves to form a zigzag channel, and the channel gap is 0.5 - 1.5 mm;

[0067] The lip seal 8 is of an inner skeleton double lip structure and is embedded in the outer end hole of the outer bearing end cover 14. The lip is in interference fit with the outer wall of the shaft body 19, and the fit gap ≤ 0.1 mm;

[0068] The static seal assembly. The mating surface between the inner bearing end cover 17 and the bearing housing 10 is sealed by the first O-ring 9, and the mating surface between the outer bearing end cover 14 and the bearing housing 10 is sealed by the second O-ring 13, and the mating surfaces are all coated with a heat-resistant silicone-based sealant 12.

[0069] When the equipment is running, the roller body 20 drives the water retaining ring 1 to rotate at a high speed. The inclined boss of the water retaining ring 1 (forming an inclination angle of 15° - 30° with the axis of the shaft body 19) guides external moisture such as spray water and flushing water to the outside of the boss, and uses centrifugal force to make the water flow along the inner wall of the water throwing cover 2 to the bottom and be discharged into the external water collecting device through the drain port 18 at the bottom of the water throwing cover 2, avoiding the moisture directly contacting the sealing surface of the bearing housing 10;

[0070] When the shaft body 19 rotates, the oil baffle ring 3 sleeved on the shaft body 19 blocks the thin oil thrown out by the bearing body 15, and cooperates with the oil baffle 4 embedded in the inner hole of the outer bearing end cover 14 to form the first oil control barrier. A small amount of leaked oil is captured by the first W-shaped oil groove 5 and the second W-shaped oil groove 6 on the outer wall of the shaft body 19. The first W-shaped oil groove 5 is located between the inner bearing end cover 17 and the bearing body 15, and the second W-shaped oil groove 6 is located between the outer bearing end cover 14 and the bearing body 15. Under the action of the centrifugal force of the spiral groove, both flow towards the inner side of the bearing housing 10 and finally return to the lubrication system through the oil return port 16 at the bottom of the bearing housing 10;

[0071] The labyrinth seal 7 (formed by at least 3 groups of staggered bosses-grooves, with a clearance of 0.5-1.5 mm) between the inner bearing end cover 17 and the bearing housing 10 blocks tiny water droplets and dust through multiple tortuous channels by using the clearance throttling effect; The lip seal 8 (double-lip structure, interference-fitted with the shaft body 19, clearance ≤0.1 mm) in the outer end hole of the outer bearing end cover 14 forms a sealed pressure zone during dynamic rotation to further prevent external impurities from invading;

[0072] The mating surface between the inner bearing end cover 17 and the bearing housing 10 is sealed by the first O-ring 9, and the mating surface between the outer bearing end cover 14 and the bearing housing 10 is sealed by the second O-ring 13, and the mating surfaces are all coated with heat-resistant silicone-based sealant 12 to ensure no oil leakage when the equipment stops or runs at low speed.

[0073] Please refer to Figure 1 In this embodiment, the water baffle ring 1 is made of stainless steel, the water throwing cover 2 is a split stainless steel structure, the outer diameter of the boss of the water baffle ring 1 is 5-10 mm larger than the inner diameter of the water throwing cover 2, and the inclined surface of the boss faces the drain port 18 of the water throwing cover 2.

[0074] Please refer to Figure 1 In this embodiment, the spiral directions of the first W-shaped oil groove 5 and the second W-shaped oil groove 6 are opposite, the spiral lift angle is 10°-20°, and the cross-section of the oil groove is rectangular or trapezoidal. The groove depths of the two W-shaped oil grooves are both 2-5 mm, the groove widths are both 5-10 mm, and they are all spirally distributed along the circumferential direction of the shaft body 19.

[0075] Please refer to Figure 1 In this embodiment, the lip seal 8 is made of nitrile rubber or fluororubber, the hardness is Shore A 70-90, and the lip interference amount is 0.2-0.5 mm.

[0076] Please refer to Figure 1 In this embodiment, the height of the boss of the labyrinth seal 7 is 2-5 mm, the depth of the groove is 3-6 mm, and the radial clearance between adjacent bosses and grooves is 0.5-1.5 mm.

[0077] Please refer to Figure 1, in this embodiment, the inner diameter of the drain port 18 of the water throwing cover 2 is 8 - 15 mm, and the axis of the drain port 18 is inclined downward at an angle of 5° - 15° with the horizontal plane.

[0078] Please refer to Figure 1 , in this embodiment, the outer diameter of the oil baffle ring 3 is 2 - 5 mm larger than the inner ring outer diameter of the bearing body 15, and the thickness of the oil baffle ring 3 is 5 - 10 mm.

[0079] Please refer to Figure 1 , in this embodiment, the materials of the first O - ring seal 9 and the second O - ring seal 13 are hydrogenated nitrile rubber, with a hardness of Shore A 70 - 80 and a cross - sectional diameter of 3 - 5 mm.

[0080] Please refer to Figure 1 , in this embodiment, the temperature resistance range of the heat - resistant silicone - based sealant 12 is - 40°C to 200°C, the tensile strength ≥ 3 MPa, and the elongation at break ≥ 200%.

[0081] The present invention also provides a bearing housing sealing and lubricating system, which includes the bearing housing thin - oil sealing and waterproof device as described above, and further includes an oil thinning station, a pipeline system, and a monitoring system;

[0082] The oil thinning station includes an oil supply pump group, an oil tank, an oil cooler, an oil filtration system, and an oil - water separation device;

[0083] The oil supply pump group includes at least two groups of oil supply pumps, where:

[0084] The first group of oil supply pumps independently drives the lubrication points of the Yankee dryer reduction gearbox, the Yankee dryer bearings, and the vacuum idler bearings;

[0085] The second group of oil supply pumps drives the lubrication points of the bearing bodies 15 on other rollers 20 except the above - mentioned lubrication points;

[0086] The oil tank is internally partitioned into an oil inlet chamber and an oil return chamber. The oil inlet chamber is connected to each lubrication point through an oil supply main pipe, and the oil return chamber is connected to the oil return ports 16 on each bearing housing 10 through an oil return pipe;

[0087] The oil cooler uses a plate - type heat exchanger and is equipped with a temperature automatic control module. The cooling water pipeline of the oil cooler adopts a double - seal structure, including an inner - layer rubber sealing ring and an outer - layer metal bellows seal;

[0088] The oil filtration system includes a coarse filter, a fine filter, and a magnetic mesh filter;

[0089] The coarse filter has a precision of 50 - 100 μm and is provided at the inlet of the oil inlet chamber;

[0090] The fine filter has a precision of 5 - 10 μm and is provided on the oil supply main pipeline;

[0091] A magnetic net filter is installed in the oil return chamber and is used to adsorb ferromagnetic impurities;

[0092] An oil-water separation device is connected to the oil return chamber. Based on the working principle of vacuum dehydration and degassing, it removes free water, emulsified water, and most of the water and gas dissolved in the oil. It automatically starts when the moisture sensor detects that the moisture in the oil exceeds 0.1%, and automatically stops working until the residual moisture content is 120 ppm (0.012%), and automatically opens the bypass oil circuit;

[0093] A pipeline system includes an oil supply main pipe and an oil return pipe;

[0094] The oil supply main pipe is connected to the oil inlet 11 of each lubrication point through an oil supply branch pipe with a flow regulating valve. The oil inlet 11 is located at the upper part of the bearing housing 10;

[0095] The oil return pipe is connected to the oil return port 16 at the bottom of the bearing housing 10 and communicates with the oil return chamber of the oil tank. A check valve and an oil return filter are provided on the oil return pipeline;

[0096] A monitoring system includes a sensor group and a host computer system;

[0097] The sensor group includes:

[0098] A temperature transmitter is installed at the oil tank, the oil supply main pipe, and the oil return port 16 of each bearing housing 10;

[0099] A pressure transmitter is installed at the outlet of the oil supply pump and each oil supply branch pipe;

[0100] A moisture sensor is installed at the oil return chamber and the outlet of the oil-water separation device;

[0101] A liquid level transmitter is installed at the top of the oil tank;

[0102] The host computer system is communicatively connected to each sensor through a signal line and is configured with:

[0103] An oil temperature monitoring module. The temperature probe continuously monitors the oil outlet temperature and can automatically adjust the water supply of the cooling water of the oil cooler so that the oil outlet temperature does not exceed 50°C; when it detects that the oil temperature exceeds 70°C, it triggers an alarm to prompt the operator to check the cooling device; when starting for the first time in cold seasons such as winter, when it monitors that the oil temperature is lower than 40°C, it will immediately start the electric heater in the oil tank and stop heating automatically after preheating the oil temperature to 40°C.

[0104] An oil pressure monitoring module. When it detects that the oil supply pressure is lower than 0.3 MPa, it triggers an alarm and switches to the standby pump;

[0105] A moisture monitoring module. When it detects that the moisture in the oil return chamber exceeds 0.1%, it automatically starts the oil-water separation device and closes it when the moisture is lower than 0.012%;

[0106] The liquid level monitoring module triggers a refueling alarm when the detected fuel tank liquid level is lower than the lower limit value.

[0107] Embodiment 2: The difference from Embodiment 1 is that:

[0108] Upgrade of the waterproof structure material: Both the water retaining ring 1 and the water throwing cover 2 are made of 316L stainless steel, and the surface is treated by electrolytic polishing. The acid corrosion resistance is improved to 2 times that of conventional stainless steel, and it is applicable to strongly corrosive environments such as the wet part of papermaking machinery.

[0109] Reinforcement of the sealing component: The lip seal 8 is replaced with a perfluoroelastomer material, and the temperature resistance range is extended to -10°C to 250°C, and it has stronger tolerance to strong acids and strong alkalis; the heat-resistant silicone-based sealant of the static sealing component is upgraded to food grade and passes the FDA certification to meet the hygiene requirements of the food processing industry.

[0110] Adjustment of the lubrication system: The inner layer sealing ring of the cooling water pipeline of the oil cooler is made of ethylene propylene diene monomer (EPDM) to prevent corrosion of chloride ions in the cooling water. At the same time, a pH value sensor is added to the oil return chamber to monitor the corrosiveness of the oil in real time.

[0111] In the embodiment of the present invention: It can operate stably in a strongly corrosive environment with a pH of 2 - 12, the service life of the sealing component is extended to 12,000 hours, and the leakage risk and maintenance frequency caused by corrosion are reduced.

[0112] Embodiment 3: The difference from Embodiment 1 is that:

[0113] Adjustment of the dynamic sealing structure: The spiral lift angles of the first W-shaped oil groove 5 and the second W-shaped oil groove 6 are increased to 25°, the groove depth is increased to 6 mm, and the spiral directions are both right-handed to enhance the oil control effect of the centrifugal force during high-speed rotation (rotation speed ≥ 4000 r / min); the number of convex platform groups of the labyrinth seal 7 is increased to 5 groups, and the channel gap is reduced to 0.3 mm to reduce oil leakage under high-speed working conditions.

[0114] Upgrade of the lubrication system: The fuel supply pump group is driven by a variable frequency motor, and the fuel supply amount is dynamically adjusted according to the signal of the rotational speed sensor (adjustment range 0 - 30 L / min) to avoid dry grinding of the bearing due to insufficient oil amount at high speed; a vortex flowmeter is added to the oil return pipeline to monitor the oil return flow in real time and feedback it to the upper computer system.

[0115] In addition, in the embodiment of the present invention, a new function of the monitoring system: A vibration acceleration sensor is added, which is linked with temperature and pressure parameters, and the running state of the bearing is monitored in real time through spectrum analysis. When the vibration value exceeds 8.5 mm / s, an automatic alarm is given and it is prompted to replace the bearing.

[0116] In the embodiments of the present invention: It is applicable to high-speed rotating equipment. The oil recovery rate is increased to 95%. The operating temperature of the bearing is reduced by 15 °C compared with Embodiment 1, and it can operate stably at a speed of 4500 r / min.

[0117] Embodiment 4: The difference from Embodiment 1 is that:

[0118] Intelligent lubrication system:

[0119] The oil supply pump group is configured with a pressure-flow double closed-loop controller, and the output of the oil supply pump is automatically adjusted through the PLC, and the response time < 0.2 s; the oil-water separation device integrates an adaptive control system, and the separation efficiency is automatically adjusted according to the water content of the oil, and the separation speed is increased by 30%.

[0120] Upgraded monitoring system:

[0121] The host computer system embeds an AI prediction model, trains the bearing remaining useful life (RUL) algorithm through historical data, and when an abnormal metal abrasive concentration is detected, an early warning of bearing wear failure is given 72 hours in advance; it supports 5G wireless communication, and real-time data can be remotely viewed and the equipment can be started and stopped through the mobile phone APP.

[0122] Modular structure design:

[0123] The water throwing cover 2 is changed to a quick-release snap connection, and the disassembly time is shortened from 30 minutes to 5 minutes; the static seal assembly adopts a pre-compressed O-ring module, and no sealant needs to be applied during replacement, further improving the maintenance efficiency.

[0124] In the embodiments of the present invention: Predictive maintenance of the bearing state can be realized, the frequency of manual inspections is reduced by 70%, the fault response time is shortened to within 5 minutes, and the overall equipment efficiency (OEE) is increased by 12%.

Claims

1. Bearing housing thin oil seal waterproof device, including a roller body (20) and a bearing housing (10); characterized in that: It also includes a waterproof structure, which includes a water retaining ring (1) and a water throwing cover (2); The water retaining ring (1) is arranged between the roller body (20) and the bearing seat (10), and is fixedly connected to the end face of the roller body (20) by bolts. An annular boss is provided on the side of the water retaining ring (1) facing the bearing seat (10), and the annular boss forms an inclination angle of 15° - 30° with the axis of the shaft body (19); The water throwing cover (2) is fixedly connected to the outer bearing end cover (14) by bolts. An annular gap of 0.5 - 2 mm is formed between the inner wall of the water throwing cover (2) and the outer wall of the boss of the water retaining ring (1). A drain port (18) is opened at the bottom of the water throwing cover (2), and the drain port (18) is communicated with an external water collecting device; A sealing structure, which includes an oil retaining ring (3) and an oil retaining ring (4); The oil retaining ring (3) is sleeved on the shaft body (19) and is located between the bearing body (15) and the inner bearing end cover (17); The oil retaining ring (4) is embedded in the inner hole of the outer bearing end cover (14) and is in clearance fit with the outer wall of the shaft body (19); The first W-shaped oil groove (5) and the second W-shaped oil groove (6) are respectively opened on the outer wall of the shaft body (19). The first W-shaped oil groove (5) is located between the inner bearing end cover (17) and the bearing body (15), and the second W-shaped oil groove (6) is located between the outer bearing end cover (14) and the bearing body (15); The labyrinth seal (7) is formed by the outer peripheral boss of the inner bearing end cover (17) and the inner hole groove of the bearing seat (10), and includes at least 3 groups of alternately arranged bosses and grooves, forming a zigzag channel, and the channel gap is 0.5 - 1.5 mm; The lip seal (8) is an inner skeleton double lip structure, which is embedded in the outer end hole of the outer bearing end cover (14), and the lip is in interference fit with the outer wall of the shaft body (19), and the fit gap ≤ 0.1 mm; A static seal assembly. The mating surface between the inner bearing end cover (17) and the bearing seat (10) is sealed by a first O-ring (9), and the mating surface between the outer bearing end cover (14) and the bearing seat (10) is sealed by a second O-ring (13), and the mating surfaces are both coated with a heat-resistant silicone-based sealant (12).

2. The oil-immersed seal waterproof device for a bearing housing according to claim 1, characterized in that: The water retaining ring (1) is made of stainless steel, the water throwing cover (2) is a split stainless steel structure, the outer diameter of the boss of the water retaining ring (1) is 5 - 10 mm larger than the inner diameter of the water throwing cover (2), and the inclined surface of the boss faces the drain port (18) of the water throwing cover (2).

3. The oil-diluted sealed waterproof device for a bearing housing according to claim 1, characterized in that: The spiral directions of the first W-shaped oil groove (5) and the second W-shaped oil groove (6) are opposite, the spiral lift angle is 10° - 20°, and the cross-section of the oil groove is rectangular or trapezoidal. The depths of the two W-shaped oil grooves are both 2 - 5 mm, the widths are both 5 - 10 mm, and they are both spirally distributed along the circumference of the shaft body (19).

4. The oil-immersed seal waterproof device for a bearing housing according to claim 1, characterized in that: The material of the lip seal (8) is nitrile rubber or fluororubber, the hardness is Shore A 70 - 90, and the interference amount of the lip is 0.2 - 0.5 mm.

5. The oil-immersed seal waterproof device for a bearing housing according to claim 1, characterized in that: The height of the boss of the labyrinth seal (7) is 2 - 5 mm, the depth of the groove is 3 - 6 mm, and the radial gap between adjacent bosses and grooves is 0.5 - 1.5 mm.

6. The oil-immersed seal waterproof device for a bearing housing according to claim 1, characterized in that: The inner diameter of the drain port (18) of the water throwing cover (2) is 8 - 15 mm, and the axis of the drain port (18) is inclined downward at an angle of 5° - 15° with the horizontal plane.

7. The oil-sealed and waterproof device for a bearing housing according to claim 1, characterized in that: The outer diameter of the oil baffle ring (3) is 2 - 5 mm larger than the outer diameter of the inner ring of the bearing body (15), and the thickness of the oil baffle ring (3) is 5 - 10 mm.

8. The oil-diluted sealed waterproof device for the bearing housing according to claim 1, characterized in that: The materials of the first O - ring seal (9) and the second O - ring seal (13) are hydrogenated nitrile rubber, with a hardness of Shore A 70 - 80 and a cross - sectional diameter of 3 - 5 mm.

9. The oil-immersed seal waterproof device for a bearing housing according to claim 1, characterized in that: The heat - resistant silicone - based sealant (12) has a temperature resistance range of - 40°C to 200°C, a tensile strength ≥ 3 MPa, and an elongation at break ≥ 200%.

10. Bearing housing sealing and lubricating system, characterized in that It includes the bearing housing thin - oil seal and waterproof device according to any one of claims 1 - 9, and further includes a thin - oil station, a pipeline system, and a monitoring system; The thin - oil station includes an oil supply pump group, an oil tank, an oil cooler, an oil filtration system, and an oil - water separation device; The oil supply pump group includes at least two groups of oil supply pumps, where: The first group of oil supply pumps independently drives the lubrication points of the Yankee dryer reduction gearbox, Yankee dryer bearings, and vacuum roll bearings; The second group of oil supply pumps drives the lubrication points of the bearing bodies (15) on other roll bodies (20) except the above - mentioned lubrication points; The oil tank is internally partitioned into an oil inlet chamber and an oil return chamber. The oil inlet chamber is connected to each lubrication point through an oil supply main pipe, and the oil return chamber is connected to the oil return ports (16) on each bearing housing (10) through an oil return pipe; The oil cooler uses a plate - type heat exchanger and is equipped with a temperature automatic control module. The cooling water pipeline of the oil cooler adopts a double - seal structure, including an inner - layer rubber sealing ring and an outer - layer metal bellows seal; The oil filtration system includes a coarse filter, a fine filter, and a magnetic - mesh filter; The coarse filter has a precision of 50 - 100 μm and is provided at the inlet of the oil inlet chamber; The fine filter has a precision of 5 - 10 μm and is provided on the oil supply main pipeline; The magnetic - mesh filter is provided in the oil return chamber and is used to adsorb ferromagnetic impurities; The oil - water separation device is connected to the oil return chamber and removes free water, emulsified water, and most of the water and gas dissolved in the oil based on the working principle of vacuum dehydration and degassing. It is automatically started when the moisture sensor detects that the moisture in the oil exceeds 0.1%, and automatically stops working until the residual moisture content is 120 ppm (0.012%), and automatically opens the bypass oil circuit; The pipeline system includes an oil supply main pipe and an oil return pipe; The oil supply main pipe is connected to the oil inlet (11) of each lubrication point through an oil supply branch pipe with a flow regulating valve, The oil inlet (11) is located at the upper part of the bearing housing (10); The oil return pipe is connected to the oil return port (16) at the bottom of the bearing housing (10) and is connected to the oil return chamber of the oil tank. A check valve and an oil return filter are provided on the oil return pipeline; The monitoring system includes a sensor group and a host computer system; The sensor group includes: Temperature transmitters are provided at the oil tank, the oil supply main pipe, and the oil return ports (16) of each bearing housing (10); Pressure transmitters are provided at the outlet of the oil supply pump and each oil supply branch pipe; Moisture sensors are provided at the oil return chamber and the outlet of the oil - water separation device; Level transmitters are provided at the top of the oil tank; The host computer system is communicatively connected to each sensor through a signal line and is configured with: The oil temperature monitoring module: The temperature probe monitors the oil outlet temperature in real time and can automatically adjust the water supply of the cooling water of the oil cooler to ensure that the oil outlet temperature does not exceed 50°C; when the detected oil temperature exceeds 70°C, an alarm is triggered to prompt the operator to check the cooling device; when starting for the first time in cold seasons such as winter, when the detected oil temperature is lower than 40°C, the electric heater in the fuel tank will be immediately started, and the heating will automatically stop after the oil temperature is heated to 40°C. The oil pressure monitoring module: When the detected oil supply pressure is lower than 0.3 MPa, an alarm is triggered and the standby pump is switched; The moisture monitoring module: When the detected moisture in the oil return chamber exceeds 0.1%, the oil-water separation device is automatically started and closed when the moisture is lower than 0.012%; The liquid level monitoring module: When the detected liquid level in the fuel tank is lower than the lower limit value, an oil replenishment alarm is triggered.

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