Ventilation device for preventing oil liquid in bearing box from dripping outwards

Abstract

The invention discloses a ventilation device for preventing oil liquid in a bearing box from dripping outwards, which comprises a shell with an inner cavity, a cavity partition plate with a first gas discharge through hole is arranged in the shell, and the cavity partition plate divides the inner cavity of the shell into a gas discharge cavity and an oil mist filtering cavity which are communicated up and down; an oil mist filtering mechanism forming a spiral oil mist filtering channel is arranged in the oil mist filtering cavity, an oil mist leading-in mechanism and a lubricating oil recycling mechanism are arranged at the lower end of the shell, and the spiral oil mist filtering channel is communicated with the bearing box through the oil mist leading-in mechanism and the lubricating oil recycling mechanism; and a second gas discharge through hole communicated with the outside is formed in the side wall of the gas discharge cavity. The motor bearing box can effectively solve the problems that oil mist escapes outwards and oil drips outwards, consumption of lubricating oil is reduced, and meanwhile the motor bearing box has the advantages of being exquisite in structure and free of cooperation of an external power source.

Description

Technical Field

[0001] This invention relates to the field of bearing housing oil mist treatment, and more particularly to a venting device to prevent oil from dripping from the bearing housing. Background Technology

[0002] Sliding bearings, as crucial support components in rotating machinery, are widely used in electric motors, steam turbines, compressors, and other mechanical equipment. To ensure pressure balance inside and outside the bearing housing, domestic electric motor sliding bearings often have a C-type air filter (JB / ZQ4522) installed above the bearing, effectively preventing external dust from entering the bearing housing. However, during the actual operation of high-speed motors, the frictional losses generated by the high-speed rotation of the bearing inside the housing cause the temperature inside the housing to be higher than the outside temperature. This results in oil mist generated during high-speed bearing rotation being discharged outside the bearing housing through the air filter. Simultaneously, the air pressure entering the bearing housing from inside the motor further increases the amount of oil mist discharged. As the oil mist passes through the air filter, some lubricating oil particles are absorbed by the filter layer and drip off the outside of the bearing housing under gravity. Additionally, some lubricating oil condenses on the outer casing of the air filter and drips off the outside of the bearing housing under gravity. These phenomena lead to severe surface contamination of the bearing housing, causing environmental pollution at the motor site, and the leaked lubricating oil also results in significant lubricant waste.

[0003] To address the problems of oil mist escape and oil dripping, utility model patent application CN202220869846.9, entitled "A Three-Dimensional Oil Mist Collector," discloses the following technical solution: It includes a support box with a support base at its lower end, a lower suction port at the lower end of the support box, and a side suction port on the side of the support box. One end of the side suction port and the lower suction port is connected to a turbine suction machine, and the other end of the turbine suction machine has a suction pipe. A leakage hole with a cylindrical structure is formed on the upper outer wall of the suction pipe. A filter plate with a three-layer structure is provided on the outer wall of the leakage hole. The lower end of the filter plate has a mounting slot that connects to a filter barrel, allowing the filter plate to be inserted into the filter barrel. This technical solution uses a turbine suction machine to extract oil mist, filters the oil mist using multi-layer filter plates, and simultaneously collects the lubricating oil. However, the above technical solutions require additional electrical energy because they use a turbine suction machine as the suction power source; at the same time, the above technical solutions have a complex structure and large size, and although they can be used on large equipment such as CNC lathes, they cannot be installed on the bearing housing of the motor. Summary of the Invention

[0004] The purpose of this invention is to provide a venting device to prevent oil from dripping from the bearing housing. This device can effectively solve the problems of oil mist leakage and oil dripping from the motor bearing housing, reduce lubricating oil consumption, and has the advantages of compact structure and no need for external power supply.

[0005] The present invention adopts the following technical solution: A venting device for preventing oil dripping from a bearing housing includes a housing with an inner cavity. A chamber partition with a first gas discharge port is disposed within the housing, dividing the inner cavity of the housing into a gas discharge chamber and an oil mist filtration chamber that are open vertically. An oil mist filtration mechanism forming a spiral oil mist removal channel is disposed within the oil mist filtration chamber. An oil mist inlet mechanism and a lubricating oil recovery mechanism are disposed at the lower end of the housing. The spiral oil mist filtration channel is connected to the bearing housing through the oil mist inlet mechanism and the lubricating oil recovery mechanism. A second gas discharge port communicating with the outside is disposed on the side wall of the gas discharge chamber.

[0006] The oil mist filtration mechanism uses a spiral filter plate with several filter mesh holes.

[0007] The outlet of the oil mist inlet mechanism is located at the center of the spiral oil mist filtration channel.

[0008] The inner diameter of the lubricating oil recovery mechanism is smaller than the inner diameter of the oil mist introduction mechanism.

[0009] The highest point of the outlet of the oil mist inlet mechanism is not higher than the lower surface of the chamber partition, and the lowest point of the outlet of the oil mist inlet mechanism is not lower than the lower inner wall of the oil mist filtration chamber.

[0010] The chamber partition is uniformly provided with a plurality of first gas discharge through holes along the circumference, and the plurality of first gas discharge through holes are located above the outermost ring of the spiral oil mist filtration channel.

[0011] The oil mist induction mechanism includes a bearing housing connection and a connecting rod. The bearing housing connection adopts a cylindrical boss integrally set at the center of the bottom end of the housing. The cylindrical boss is connected to the bearing housing through an external thread. The center of the cylindrical boss is connected to the lower end of the connecting rod through an internal threaded through hole. The lower part of the connecting rod has a vent hole with an opening at the lower end vertically along the axis. The lower circumference of the connecting rod has a vent groove that communicates with the vent hole.

[0012] The housing is a cylindrical seat with an open top and sealed by a top cover. The outer circumference of the top cover is provided with a downward-facing annular protrusion. Several second gas discharge holes that communicate with the outside are evenly opened along the circumference on the upper side wall of the seat inside the annular protrusion. The chamber partition is a circular cover plate that matches the inner diameter of the seat. Several first gas discharge holes are evenly opened along the circumference on the circular cover plate above the outermost ring of the spiral oil mist filtration channel.

[0013] The upper and lower end faces of the filter baffle are respectively abutted against the lower surface of the circular cover plate and the lower surface of the inner cavity. The inner diameter of the innermost annular space at the center of the filter baffle is 1.5-2 times larger than the outer diameter of the connecting rod.

[0014] According to claim 9, the venting device for preventing oil dripping from the bearing housing is characterized in that: the center of the circular cover plate and the upper cover are both provided with a connecting rod through hole adapted to the connecting rod, the upper end of the connecting rod passes through the connecting rod through the connecting rod through the hole and passes through the chamber partition and the upper cover and is located above the upper cover, and the upper end of the connecting rod is also provided with a hexagonal boss, and a sealing gasket is fitted on the connecting rod between the hexagonal boss and the upper cover.

[0015] This invention fully utilizes the power of the oil mist vapor itself, combined with the spiral filter baffle that forms a spiral oil mist filtration channel, so that the vortex energy of the lubricating oil particles in the oil mist vapor continuously increases in the rotating airflow, the flow velocity of the lubricating oil particles gradually decreases, and they gradually detach from the oil mist vapor and deposit at the bottom of the spiral oil mist filtration channel; the lubricating oil deposited between the baffles of different chambers in the spiral oil mist filtration channel can re-enter the bearing housing through the filter mesh and the oil return pipe.

[0016] This invention fully utilizes the centrifugal force generated when oil mist vapor rotates and flows in a spiral oil mist filtration channel to throw lubricating oil particles in the oil mist toward the surface of the spiral filter baffle. The spiral filter baffle, made of metal woven mesh or metal sintered mesh, adsorbs the lubricating oil particles in time, and under the action of gravity, the lubricating oil particles drip to the bottom of the spiral oil mist filtration channel and finally re-enter the bearing housing through the oil return pipe.

[0017] This invention utilizes a top cover and a circular cover plate to form a gas discharge chamber and an oil mist filtration chamber. During the process of oil mist vapor entering the gas discharge chamber, some oil will condense on the lower surface of the circular cover plate and drip down to the bottom of the spiral oil mist filtration channel under gravity. After entering the gas discharge chamber, some oil will condense on the lower surface of the top cover inside the gas discharge chamber and drip down to the upper surface of the circular cover plate under gravity, then flow back to the bottom of the spiral oil mist filtration channel through the first gas discharge orifice. The lubricating oil deposited at the bottom of the spiral oil mist filtration channel eventually re-enters the bearing housing through the oil return pipe.

[0018] In this invention, by setting an oil return pipe with an inner diameter smaller than that of the vent hole in the connecting rod, it is possible to effectively prevent oil mist vapor in the bearing housing from entering the spiral oil mist filter channel through the oil return pipe, thus preventing the oil mist vapor from blowing the lubricating oil back into oil mist.

[0019] In this invention, by setting the position of the vent groove in the connecting rod so that the highest end of the vent groove is not higher than the lower surface of the circular cover plate, and the lowest end is 8mm-12mm higher than the lower surface of the inner cavity of the seat cylinder, it can prevent oil mist vapor from passing over the circular cover plate and directly entering the gas discharge chamber to form oil mist leakage, and also prevent the lubricating oil deposited at the bottom of the oil mist filter chamber from entering the return oil pipe, and prevent the oil mist vapor from blowing the lubricating oil into oil mist again.

[0020] In this invention, the connecting rod can be combined with the top cover, the circular cover plate and the filter baffle to form an assembled structure, which makes it easy for workers to quickly disassemble and clean the filter baffle in a timely manner. It has the characteristics of simple and exquisite structure and convenient installation and maintenance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the separation state in Embodiment 1 of the present invention; Figure 4 This is a cross-sectional structural diagram of Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the connection structure between the seat cylinder and the circular cover plate in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the connection structure between the seat cylinder and the filter baffle in Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the filter baffle in Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the connecting rod in Embodiment 1 of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figures 1 to 2 As shown, the ventilation device for preventing oil dripping from the bearing housing 9 according to the present invention includes a housing 1 with an inner cavity. A chamber partition 3 with a first gas discharge port 2 is provided inside the housing 1. The chamber partition 3 divides the inner cavity of the housing 1 into a gas discharge chamber 4 and an oil mist filtration chamber 5 that are connected vertically. An oil mist filtration mechanism 6 forming a spiral oil mist filtration channel 11 is provided inside the oil mist filtration chamber 5. An oil mist inlet mechanism 7 and a lubricating oil recovery mechanism 8 are provided at the lower end of the housing 1. The spiral oil mist filtration channel 11 is connected to the bearing housing 9 through the oil mist inlet mechanism 7 and the lubricating oil recovery mechanism 8. A second gas discharge port 10 that is connected to the outside is provided on the side wall of the gas discharge chamber 4.

[0024] During operation, the oil mist vapor generated by the bearing during high-speed operation enters the spiral oil mist filtration channel 11 from the bearing housing 9 through the oil mist inlet mechanism 7, and flows within the spiral oil mist filtration channel 11 using its own power. As the oil mist vapor passes through the spiral oil mist filtration channel 11, on the one hand, the vortex energy of the lubricating oil particles in the oil mist vapor continuously increases in the rotating airflow, and the flow velocity of the lubricating oil particles gradually decreases, causing them to gradually detach from the oil mist vapor and deposit at the bottom of the spiral oil mist filtration channel 11; on the other hand, the centrifugal force generated by the rotating flow of the oil mist vapor in the spiral oil mist filtration channel 11 throws the lubricating oil particles in the oil mist towards the surface of the oil mist filtration mechanism 6, allowing the oil mist filtration mechanism 6 to promptly adsorb the lubricating oil particles, and under the action of gravity, the lubricating oil particles drip to the bottom of the spiral oil mist filtration channel 11.

[0025] During the process of oil mist vapor entering the gas discharge chamber 4, some oil will condense on the lower surface of the chamber partition 3 and drip down to the bottom of the spiral oil mist removal channel 11 under the action of gravity. After the oil mist vapor enters the gas discharge chamber 4, some oil will condense on the upper inner wall (i.e., the upper surface of the inner cavity) of the gas discharge chamber 4 and drip down to the lower inner wall (i.e., the upper surface of the chamber partition 3) of the gas discharge chamber 4 under the action of gravity, and then flow back to the bottom of the spiral oil mist removal channel 11 through the first gas discharge through hole 2.

[0026] Through the above-mentioned oil mist filtration operation, the steam after oil mist removal is finally discharged into the atmosphere through the second gas discharge port 10 set on the side wall of the gas discharge chamber 4; the lubricating oil deposited at the bottom of the spiral oil mist filtration channel 11 is finally reintroduced into the bearing housing 9 through the lubricating oil recovery mechanism 8, thereby effectively solving the problems of oil mist leakage and oil dripping from the motor bearing housing 9.

[0027] To further improve the oil mist filtration effect, such as Figure 3 , Figure 4 and Figure 6 As shown, in this invention, the oil mist filtration mechanism 6 can adopt a spiral filter baffle 12. The upper and lower ends of the filter baffle 12 are respectively pressed against the upper inner wall of the oil mist filtration chamber 5 (i.e., the lower surface of the chamber baffle 3) and the lower inner wall of the oil mist filtration chamber 5 (i.e., the lower surface of the inner cavity) to form a spiral oil mist filtration channel 11 that is closed from top to bottom. The filter baffle 12 can be made of metal woven mesh or metal sintered mesh and form a plurality of filter mesh holes with a pore size of less than 0.5 mm.

[0028] like Figure 4 , Figure 6 and Figure 7 As shown, in this invention, the outlet of the oil mist inlet mechanism 7 can be set at the center of the spiral oil mist filtration channel 11 to ensure that the oil mist vapor generated when the bearing is running at high speed can make maximum use of the length of the spiral oil mist filtration channel 11 and enhance the oil mist filtration effect.

[0029] like Figure 4 and Figure 7 As shown, in this invention, the inlet of the lubricating oil recovery mechanism 8 is located on the outlet side of the oil mist introductory mechanism 7; the lubricating oil deposited at the bottom of the oil mist filtration chamber 5 flows promptly to the inlet of the lubricating oil recovery mechanism 8 through the filter mesh provided on the filter baffle 12, and finally flows smoothly back into the bearing housing 9. The lubricating oil recovery mechanism 8 can be a return oil pipe 26.

[0030] In this invention, the inner diameter of the lubricating oil flow channel in the lubricating oil recovery mechanism 8 is smaller than the inner diameter of the oil mist flow channel in the oil mist introduction mechanism 7, which can effectively prevent the oil mist vapor in the bearing housing 9 from entering the spiral oil mist filter channel 11 through the lubricating oil recovery mechanism 8, and prevent the oil mist vapor from blowing the lubricating oil back into oil mist.

[0031] In this invention, the highest point of the outlet of the oil mist inlet mechanism 7 is not higher than the lower surface of the chamber partition 3, and the lowest point of the outlet of the oil mist inlet mechanism 7 is not lower than the lower inner wall (i.e., the lower surface of the inner cavity) of the oil mist filter chamber 5. The lowest point of the outlet of the oil mist inlet mechanism 7 can be 8mm-12mm higher than the lower inner wall of the oil mist filter chamber 5. The above-mentioned position setting of the outlet of the oil mist inlet mechanism 7 can prevent oil mist vapor from passing over the chamber partition 3 and directly entering the gas discharge chamber 4 to form oil mist leakage, and can also prevent the lubricating oil deposited at the bottom of the oil mist filter chamber 5 from entering the oil mist inlet mechanism 7, and prevent the oil mist vapor from blowing the lubricating oil into oil mist again.

[0032] like Figure 4 and Figure 5 As shown, in this invention, which is adapted to the oil mist filtration mechanism 6, a plurality of first gas discharge through holes 2 are uniformly arranged along the circumference on the chamber partition 3, and the plurality of first gas discharge through holes 2 are located above the outermost ring of the spiral oil mist filtration channel 11, so as to ensure that the oil mist vapor moves from the center of the spiral oil mist filtration channel 11 to the outermost ring. After being fully filtered by the oil mist filtration mechanism 6, it can enter the gas discharge chamber 4 through the plurality of first gas discharge through holes 2 arranged above the outermost ring of the spiral oil mist filtration channel 11, thereby avoiding the possibility that the unfiltered oil mist vapor directly enters the gas discharge chamber 4.

[0033] In accordance with the first gas discharge through-hole 2, in this invention, the sidewall of the gas discharge chamber 4 is uniformly provided with a plurality of second gas discharge through-holes 10 that communicate with the outside.

[0034] like Figures 3 to 8As shown, for ease of installation and maintenance, the oil mist introductory mechanism 7 in this invention includes a bearing housing connection part and a connecting rod 13. The bearing housing connection part can be a cylindrical boss 14 integrally formed with the housing 1 and located at the center of the bottom end of the housing 1. The outer circumference of the cylindrical boss 14 is provided with an external thread for connecting with the bearing housing 9. The housing 1 is threadedly connected to the bearing housing 9 through the cylindrical boss 14. The center of the cylindrical boss 14 is provided with an internal thread through hole 25 that matches the connecting rod 13. The lower part of the connecting rod 13 is provided with a vent hole 15 with an open bottom along the axis. The lower circumference of the connecting rod 13 is provided with a vent groove 16 that communicates with the vent hole 15, and the vent groove 16 serves as the outlet of the oil mist introductory mechanism 7. The circumferential surface of the lower end of the connecting rod 13 is provided with an external thread 24 that matches the internal thread through hole 25 in the cylindrical boss 14. The lower end of the connecting rod 13 is threadedly connected to the housing 1 through the internal thread through hole 25 provided on the cylindrical boss 14.

[0035] In this invention, the housing 1 can be a cylindrical seat 17 with an open top. The upper opening of the seat 17 is sealed by a top cover 18. The diameter of the top cover 18 is larger than the diameter of the upper opening of the seat 17, and the outer circumference of the top cover 18 is provided with a downward-facing annular protrusion 19. Several second gas discharge holes 10 that communicate with the outside are evenly opened along the circumference on the upper sidewall of the seat 17 inside the annular protrusion 19. The chamber partition 3 can be a circular cover plate 20 that matches the inner diameter of the seat 17. Several first gas discharge holes 2 are evenly opened along the circumference on the circular cover plate 20 above the outermost ring of the spiral oil mist filtration channel 11. Both the circular cover plate 20 and the upper cover 18 have a connecting rod through hole 21 at their center, which is adapted to the connecting rod 13. The upper end of the connecting rod 13 passes through the connecting rod through hole 21, passes through the circular cover plate 20 and the upper cover 18 and is located above the upper cover 18. The upper end of the connecting rod 13 is also provided with a hexagonal boss 22. A sealing gasket 23 is also fitted on the connecting rod 13 between the hexagonal boss 22 and the upper cover 18.

[0036] During assembly, the lower end of the connecting rod 13 passes through the sealing gasket 23, the upper cover 18, the circular cover plate 20 and the filter plate 12 in sequence, and then connects to the seat cylinder 17 through the internal threaded through hole 25 provided on the cylindrical boss 14. The hexagonal boss 22 at the upper end of the connecting rod 13 fixes the upper cover 18 to the upper end face of the seat cylinder 17.

[0037] The present invention will now be described in detail with reference to the accompanying drawings and Embodiment 1: Example 1: like Figures 3 to 8As shown, the venting device for preventing oil dripping from the bearing housing 9 according to the present invention includes a cylindrical seat 17 with an open upper end. The upper opening of the seat 17 is sealed by a cover 18 with a downward-facing annular flange 19 on its outer circumference. A matching circular cover plate 20 is provided in the inner cavity of the seat 17. The circular cover plate 20 divides the inner cavity of the housing 1 into an upper gas discharge chamber 4 and a lower oil mist filter chamber 5. A spiral filter baffle 12 is provided in the oil mist filter chamber 5. The upper and lower end faces of the filter baffle 12 are respectively connected to the lower surface and inner surface of the circular cover plate 20. The lower surface of the cavity is pressed tightly to form a spiral oil mist filtration channel 11 that is closed from top to bottom; on the circular cover plate 20 above the outermost ring of the spiral oil mist filtration channel 11, a plurality of first gas discharge holes 2 are evenly arranged circumferentially, and the gas discharge cavity 4 and the oil mist filtration cavity 5 are connected through the plurality of first gas discharge holes 2; the upper side wall of the seat 17 on the inner side of the annular convex edge 19 is evenly opened circumferentially with a plurality of second gas discharge holes 10 that are connected to the outside, and the gas discharge cavity 4 is connected to the outside through the second gas discharge holes 10; the bottom of the seat 17 A cylindrical boss 14 is integrally provided at the center of the end, and the outer circumference of the cylindrical boss 14 is threaded to the bearing housing 9 using an external thread; a hexagonal boss 22 is provided at the upper end of the connecting rod 13, and a vent hole 15 with an opening at the lower end is vertically provided along the axis of the lower part of the connecting rod 13, and a vent groove 16 communicating with the vent hole 15 is also provided radially along the lower circumference of the connecting rod 13, and an external thread 24 is provided on the circumferential surface of the lower end of the connecting rod 13; both the circular cover plate 20 and the upper cover 18 are provided with connecting rod passage holes 2 that are adapted to the connecting rod 13 at their center. 1. A threaded through hole 25 is provided at the center of the cylindrical boss 14. The lower end of the connecting rod 13 passes through the center of the upper cover 18, the circular cover plate 20 and the spiral filter plate 12 in sequence via the connecting rod through hole 21. Then, it is threadedly connected to the seat cylinder 17 through the external thread 24 at the lower end of the connecting rod 13 and the threaded through hole 25 on the cylindrical boss 14. The upper cover 18 is fixed to the upper end face of the seat cylinder 17 by the hexagonal boss 22 provided at the upper end of the connecting rod 13. A sealing gasket 23 is also fitted on the connecting rod 13 between the hexagonal boss 22 and the upper cover 18. An oil return pipe 26 communicating with the oil mist filter chamber 5 is provided on the bottom surface of the seat cylinder 17 on one side of the threaded through hole 25.

[0038] In Example 1, the oil mist introductory mechanism 7, composed of the connecting rod 13 and the cylindrical boss 14, can reliably connect with the bearing housing 9 using the cylindrical boss 14. It also allows oil mist vapor from the bearing housing 9 to smoothly enter the spiral oil mist removal channel 11 in the oil mist filtration chamber 5 using the vent holes 15 and vent grooves 16 on the connecting rod 13. Simultaneously, the modular design of the connecting rod 13, along with the upper cover 18, the circular cover plate 20, and the filter partition 12, facilitates quick assembly and disassembly by operators, enabling timely cleaning of the filter partition 12. This design features a simple and ingenious structure, and convenient installation and maintenance.

[0039] The spiral filter baffle 12, forming the spiral oil mist filtration channel 11, is made of metal woven mesh or metal sintered mesh and has several filter mesh holes with a hole diameter of less than 0.5 mm, resulting in high resistance when oil mist passes through the spiral filter baffle 12. Since the outer diameter of the circular cover plate 20 is slightly smaller than the inner diameter of the seat cylinder 17 to fit the seat cylinder 17, the gas resistance at the mating point between the seat cylinder 17 and the circular cover plate 20 is high. Simultaneously, the connecting rod through-hole 21 at the center of the circular cover plate 20 matches the outer diameter of the connecting rod 13, resulting in very low air leakage at the mating point between the connecting rod through-hole 21 and the connecting rod 13. Ultimately, the spiral oil mist filtration channel 11 is formed by the lower surface of the inner cavity of the seat cylinder 17, the spiral filter baffle 12, and the lower surface of the circular cover plate 20. The inner diameter of the innermost annular space at the center of the spiral filter baffle 12 is 1.5-2 times larger than the outer diameter of the connecting rod, i.e., 2.5-3 times the outer diameter of the connecting rod.

[0040] The inner diameter of the connecting rod through hole 21 of the sealing gasket, the top cover 18 and the circular cover plate 20 is slightly larger than the outer diameter of the connecting rod 13. This facilitates the installation of the connecting rod 13 and minimizes air leakage at the connection between the connecting rod 13 and the connecting rod through hole 21.

[0041] The inner diameter of the return oil pipe 26 is smaller than the inner diameter of the vent hole 15 in the connecting rod 13, which can effectively prevent the oil mist vapor in the bearing housing 9 from entering the spiral oil mist filter channel 11 through the return oil pipe 26, and prevent the oil mist vapor from blowing the lubricating oil back into oil mist.

[0042] The upper edge of the vent groove 16 in the connecting rod 13 is no higher than the lower surface of the circular cover plate 20, and the lower edge of the vent groove 16 is 8mm-12mm higher than the lower surface of the inner cavity of the seat cylinder 17. This positioning of the vent groove 16 prevents oil mist vapor from directly entering the gas discharge chamber 4 through the chamber partition 3, thus preventing oil mist leakage. It also prevents lubricating oil deposited at the bottom of the oil mist filter chamber 5 from entering the oil mist inlet mechanism 7, thus preventing oil mist vapor from blowing the lubricating oil back into oil mist. The lubricating oil deposited at the bottom of the oil mist filter chamber 5 can flow through the filter mesh on the spiral filter partition 12 to the inlet of the return oil pipe 26, and finally smoothly return to the bearing housing 9 through the return oil pipe 26, thereby reducing lubricating oil loss.

[0043] Example 1 during use: When the bearing operates at high speed, the oil mist vapor generated enters the spiral oil mist filtration channel 11 in the oil mist filtration chamber 5 through the vent hole 15 and vent groove 16 of the connecting rod 13 from inside the bearing housing 9. It then flows within the spiral oil mist filtration channel 11 using its own power to filter the oil mist through the spiral filter baffle 12 and finally flows to the outermost channel of the spiral oil mist filtration channel 11. The oil mist vapor enters the gas discharge chamber 4 through a number of first gas discharge holes 2 evenly arranged around the circumference of the circular cover plate 20, and finally is discharged into the atmosphere through a number of second gas discharge holes 10 evenly opened around the circumference of the upper side wall of the seat cylinder 17.

[0044] When oil mist vapor passes through the spiral oil mist filtration channel 11, on the one hand, the vortex energy of the lubricating oil particles in the oil mist vapor continuously increases in the rotating airflow, and the flow velocity of the lubricating oil particles gradually decreases, so they will gradually detach from the oil mist vapor and deposit at the bottom of the spiral oil mist filtration channel 11; on the other hand, the centrifugal force generated when the oil mist vapor rotates and flows in the spiral oil mist filtration channel 11 throws the lubricating oil particles in the oil mist onto the surface of the spiral filter baffle 12, and uses the filter mesh to adsorb the lubricating oil particles in time, and under the action of gravity, the lubricating oil particles drip to the bottom of the spiral oil mist filtration channel 11.

[0045] As the oil mist vapor enters the gas discharge chamber 4, some of the oil will condense on the lower surface of the circular cover plate 20 and drip down to the bottom of the spiral oil mist removal channel 11 under gravity. After entering the gas discharge chamber 4, some of the oil will condense on the lower surface of the upper cover 18 and drip down to the upper surface of the circular cover plate 20 under gravity, and then flow back to the bottom of the spiral oil mist removal channel 11 through the first gas discharge through-hole 2. At the same time, some of the oil condensed on the lower surface of the upper cover 18 can also flow back to the bottom of the spiral oil mist removal channel 11 along the inner wall of the seat cylinder 17 under the guidance of the inner wall of the seat cylinder 17.

[0046] The lubricating oil deposited between the partitions 3 of different chambers in the spiral oil mist filtration channel 11 can flow to the inlet of the return oil pipe 26 in a timely manner through the filter mesh provided on the spiral filter partition 12, and finally flow smoothly back into the bearing housing 9.

[0047] Through the above-mentioned oil mist filtration operation, the steam after oil mist removal is finally discharged into the atmosphere through the second gas discharge port 10 set on the side wall of the gas discharge chamber 4; the lubricating oil deposited at the bottom of the spiral oil mist filtration channel 11 is finally reintroduced into the bearing housing 9 through the lubricating oil recovery mechanism 8, thereby effectively solving the problems of oil mist leakage and oil dripping from the motor bearing housing 9.

[0048] Based on the actual needs of the application scenario, this invention fully analyzes the dynamic characteristics and component types of oil mist vapor. It uses the airflow vortex of the spiral oil mist filtration channel 11 to block oil mist particles, the spiral filter baffle 12 to adsorb oil mist particles, and the circular cover plate 20 and the upper cover 18 to condense oil mist particles. It also uses the inner diameter setting of the oil return pipe 26 and the position setting of the vent groove 16 to prevent lubricating oil atomization, and the seat 17 to prevent oil dripping. These multiple measures are used in combination to ultimately achieve the purpose of preventing oil mist from escaping from the bearing housing 9 and oil dripping, thereby reducing lubricating oil consumption.

[0049] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A venting device for preventing oil dripping from a bearing housing, characterized in that: The device includes a housing with an inner cavity. Inside the housing, there is a chamber partition with a first gas discharge port. The chamber partition divides the inner cavity of the housing into a gas discharge chamber and an oil mist filtration chamber that are open at both ends. The oil mist filtration chamber is equipped with an oil mist filtration mechanism that forms a spiral oil mist filtration channel. The lower end of the housing is equipped with an oil mist inlet mechanism and a lubricating oil recovery mechanism. The spiral oil mist filtration channel is connected to the bearing housing through the oil mist inlet mechanism and the lubricating oil recovery mechanism. The side wall of the gas discharge chamber is equipped with a second gas discharge port that is open to the outside.

2. The venting device for preventing oil dripping from the bearing housing according to claim 1, characterized in that: The oil mist filtration mechanism uses a spiral filter plate with several filter mesh holes.

3. The venting device for preventing oil dripping from the bearing housing according to claim 1, characterized in that: The outlet of the oil mist inlet mechanism is located at the center of the spiral oil mist filtration channel.

4. The venting device for preventing oil dripping from the bearing housing according to claim 1, characterized in that: The inner diameter of the lubricating oil recovery mechanism is smaller than the inner diameter of the oil mist introduction mechanism.

5. The venting device for preventing oil dripping from the bearing housing according to claim 1, characterized in that: The highest point of the outlet of the oil mist inlet mechanism is not higher than the lower surface of the chamber partition, and the lowest point of the outlet of the oil mist inlet mechanism is not lower than the lower inner wall of the oil mist filtration chamber.

6. The venting device for preventing oil dripping from the bearing housing according to claim 1, characterized in that: The chamber partition is uniformly provided with a plurality of first gas discharge through holes along the circumference, and the plurality of first gas discharge through holes are located above the outermost ring of the spiral oil mist filtration channel.

7. The venting device for preventing oil dripping from the bearing housing according to claim 1, characterized in that: The oil mist induction mechanism includes a bearing housing connection and a connecting rod. The bearing housing connection adopts a cylindrical boss integrally set at the center of the bottom end of the housing. The cylindrical boss is connected to the bearing housing through an external thread. The center of the cylindrical boss is connected to the lower end of the connecting rod through an internal threaded through hole. The lower part of the connecting rod has a vent hole with an opening at the lower end vertically along the axis. The lower circumference of the connecting rod has a vent groove that communicates with the vent hole.

8. The venting device for preventing oil dripping from the bearing housing according to claim 7, characterized in that: The housing is a cylindrical seat with an open top and sealed by a top cover. The outer circumference of the top cover is provided with a downward-facing annular protrusion. Several second gas discharge holes that communicate with the outside are evenly opened along the circumference on the upper side wall of the seat inside the annular protrusion. The chamber partition is a circular cover plate that matches the inner diameter of the seat. Several first gas discharge holes are evenly opened along the circumference on the circular cover plate above the outermost ring of the spiral oil mist filtration channel.

9. The venting device for preventing oil dripping from the bearing housing according to claim 8, characterized in that: The upper and lower end faces of the filter baffle are respectively abutted against the lower surface of the circular cover plate and the lower surface of the inner cavity. The inner diameter of the innermost annular space at the center of the filter baffle is 1.5-2 times larger than the outer diameter of the connecting rod.

10. The venting device for preventing oil dripping from the bearing housing according to claim 9, characterized in that: Both the circular cover plate and the top cover have a connecting rod through hole at their center, which is adapted to the connecting rod. The upper end of the connecting rod passes through the connecting rod through the connecting rod through the hole and passes through the circular cover plate and the top cover, and is located above the top cover. The upper end of the connecting rod is also provided with a hexagonal boss, and a sealing gasket is fitted on the connecting rod between the hexagonal boss and the top cover.

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