Self-cleaning bearing and fan assembly

Abstract

The utility model relates to the technical field of bearings, in particular to a self-cleaning bearing and a fan component, a bearing body of the self-cleaning bearing comprises an outer ring and an inner ring, a lubricating layer is arranged between the outer ring and the inner ring, the outer ring is rotatably sleeved outside the inner ring, and the self-cleaning bearing is characterized by further comprising an oil discharge ring, the oil discharge ring is arranged on the side of the bearing body, a waste oil cavity is formed in the oil discharge ring, the inner diameter of the oil discharge ring is the same as that of the inner ring, the waste oil cavity is communicated with the lubricating layer, and an oil drainage port is formed in the bottom of the oil discharge ring. Due to the arrangement of the oil discharge ring, flowing of lubricating oil overflowing out of the lubricating layer is limited, the oil discharge ring can collect and guide the overflowing lubricating oil to flow out of the oil drainage port, the situation that the lubricating oil pollutes a main shaft can be avoided, the lubricating oil in the lubricating layer cannot be affected, and the loss speed of the lubricating oil is not increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to bearing technical field more particularly, relate to a kind of self-cleaning bearing and fan assembly. BACKGROUND

[0002] During the operation of wind turbine, it is required to supplement grease to main shaft bearing periodically according to technical requirements to meet the lubrication demand of main shaft bearing. However, since main shaft bearing has no oil discharge channel, the supplement of grease in bearing will be increased continuously, which finally leads to the continuous increase of pressure in bearing cavity. When the pressure value exceeds the maximum sealing pressure of seal, the grease will overflow from the bearing and flow to the main shaft, which results in the contamination of main shaft speed sensor by grease, and even causes fire hazard, which is not conducive to the safe and stable operation of wind turbine.

[0003] Therefore, there is a need for a bearing that can be self-cleaning to eliminate the risk of lubricating oil leakage.

[0004] A self-cleaning waste oil bearing is disclosed in Chinese patent, which comprises an inner ring, an outer ring and a dust cover. The inner ring is arranged inside the outer ring and is fixedly connected by a snap spring. The dust cover is nested on the top of the outer ring. The inner side of the outer ring is provided with a retainer, which is fixedly connected with the outer ring by screws. This self-cleaning waste oil bearing integrates the outer ring, the inner ring, the steel ball, the retainer and the dust cover, which not only completes the rotation function of the bearing, but also increases the service life of the bearing. The setting of the oil inlet and the oil outlet can realize the functions of lubrication and cleaning of oil stains simultaneously. However, the oil discharge port of this scheme is arranged on the outer ring, which makes the lubricating oil on the steel ball more likely to be discharged from the oil discharge port during rolling, increasing the loss of lubricating oil. SUMMARY

[0005] The utility model aims at overcoming the deficiency of too fast lubricating oil loss and large lubricating oil loss of prior art oil discharge device, and provides a self-cleaning bearing and a fan assembly using the self-cleaning bearing. This self-cleaning bearing only collects and discharges the normally overflowing lubricating oil, which will not affect the loss speed of lubricating oil in the bearing.

[0006] To solve the above technical problems, the utility model adopts the technical scheme of:

[0007] A self-cleaning bearing is provided, which comprises a bearing body including an outer ring and an inner ring. A lubricating layer is arranged between the outer ring and the inner ring. The outer ring is rotatably sleeved on the outer ring. The bearing body further comprises an oil discharge ring, which is arranged beside the bearing body. An oil waste cavity is arranged in the oil discharge ring. The inner diameter of the oil discharge ring is the same as the inner diameter of the inner ring. The oil waste cavity is in communication with the lubricating layer. A drain port is arranged at the bottom of the oil discharge ring.

[0008] Through the arrangement, during use, the self-cleaning bearing sleeve is arranged on the main shaft, and the inner ring and the oil discharge ring are in abutment with the main shaft; when lubrication is needed, workers add lubricating oil to the lubricating layer of the bearing, and when the pressure in the lubricating layer is too large, the lubricating oil overflows onto the main shaft between the inner ring and the oil discharge ring; because the inner ring and the oil discharge ring are in abutment with the main shaft, the lubricating oil can only flow to the oil discharge ring, and the waste oil enters the waste oil cavity in the oil discharge ring, is discharged from the oil discharge port at the bottom of the oil discharge ring after accumulation in the waste oil cavity, and thus the lubricating oil can be prevented from polluting the main shaft, the workload of bearing cleaning and maintenance is reduced, and the lubricating oil in the lubricating layer is not affected, and the wear speed of the lubricating oil is not accelerated.

[0009] Preferably, the oil discharge ring comprises a mounting plate, a sealing ring and an oil guide ring, the mounting plate is fixedly connected with the outer ring, the sealing ring is rotatably connected with the mounting plate, and the oil guide ring is fixedly connected with the mounting plate; the diameter of the oil guide ring is greater than that of the sealing ring, and the inner diameter of the sealing ring is the same as that of the inner ring; the waste oil cavity is formed between the oil guide ring and the sealing ring, and the oil discharge port is arranged at the bottom of the oil guide ring.

[0010] Through the arrangement, the oil guide ring is arranged on the main shaft, and the oil discharge port is arranged at the bottom of the oil guide ring, so that the discharged waste oil cannot pollute the main shaft, the workers can easily collect the waste oil, and the workload of cleaning and maintenance of the bearing and the main shaft is reduced.

[0011] Preferably, the sealing ring is provided with a first oil collecting groove, a first oil baffle is arranged on the side of the first oil collecting groove close to the inner ring, and the first oil baffle is in abutment with the mounting plate.

[0012] Through the arrangement, when the lubricating oil accumulated between the inner ring and the sealing ring reaches a certain degree, the pressure of the lubricating oil breaks through the gap between the first oil baffle and the mounting plate, and the lubricating oil flows into the waste oil cavity between the sealing ring and the oil guide ring, so that the lubricating oil can be prevented from flowing out of the bearing quickly; because the main shaft is in a rotating state, the waste oil is driven to overflow from all directions, and when the waste oil overflows from above the main shaft, the waste oil falls into the first oil collecting groove along the first oil baffle, the first oil collecting groove can prevent the waste oil from being thrown out when the sealing ring rotates with the main shaft, ensures that the waste oil is in the waste oil cavity, and reduces the probability of secondary pollution.

[0013] Preferably, the included angle between the first oil baffle and the first oil collecting groove is greater than 90 degrees.

[0014] Through the arrangement, when the waste oil in the first oil collecting groove flows to the oil guide ring, the wall-hanging phenomenon of the waste oil in the first oil collecting groove is reduced, and the waste oil is discharged.

[0015] Preferably, a first boss is further arranged on the side of the first oil collecting groove, the first boss is arranged opposite to the first oil baffle, and the height of the first boss is lower than that of the first oil baffle.

[0016] Through the arrangement, the first boss limits the waste oil in the first oil collecting groove, avoiding the waste oil in the first oil collecting groove flowing out along the extension direction of the main shaft.

[0017] Preferably, the oil guide ring is provided with a second oil collecting groove, and the second oil collecting groove is provided with a second oil baffle away from the mounting plate, and a rotating gap is formed between the second oil baffle and the first boss.

[0018] When installed, the rotating gap is lower than the shaft shoulder. Through the arrangement, when the waste oil breaks through the sealing ring and flows out from the bottom of the main shaft, the waste oil accumulates at the bottom of the second oil collecting groove, and the waste oil on the first oil collecting groove is also thrown into the second oil collecting groove along with the rotation of the sealing ring. The second oil baffle is used to limit the waste oil in the second oil collecting groove from flowing to the main shaft. Since the oil guide ring is fixedly arranged and the sealing ring rotates along with the main shaft, the rotating gap can avoid friction between the second oil baffle and the first boss, and the rotating gap being lower than the shaft shoulder can avoid the waste oil flowing out from the rotating gap, which is conducive to reducing the pollution of lubricating oil to the main shaft.

[0019] Preferably, the second oil collecting groove is further provided with a second boss, the second boss is arranged opposite to the second oil baffle, the height of the second boss is lower than the height of the first oil baffle, and the second boss abuts against the mounting plate.

[0020] Through the arrangement, the second boss limits the waste oil in the second oil collecting groove, avoiding the waste oil flowing out from the gap between the oil guide ring and the mounting plate.

[0021] Preferably, the device further comprises an oil scraping plate, the oil scraping plate is fixedly connected to the mounting plate, the oil scraping plate is located above the oil discharge port, and the oil scraping plate is located between the first oil baffle and the first boss.

[0022] The lubricating grease has certain viscosity and may adhere to the sealing ring and overflow from the sealing ring as the accumulation amount increases. Through the arrangement, the sealing ring rotates along with the main shaft, and when the sealing ring rotates to the oil scraping plate, the oil scraping plate scrapes the waste oil on the sealing ring, avoiding overflow of the waste oil due to excessive accumulation.

[0023] Preferably, the device further comprises a dustproof plate, the dustproof plate is fixedly connected to the outer ring, and the dustproof plate is symmetrically arranged with the mounting plate about the outer ring.

[0024] Through the arrangement, dust can be prevented from entering the lubricating layer of the bearing from the other side, avoiding scratching of the bearing by the dust, which is conducive to improving the service life of the bearing.

[0025] A fan assembly, comprising a driving mechanism, a main shaft, a mounting table, a fan blade and a self-cleaning bearing as described above, one end of the main shaft is connected with the driving mechanism, the other end of the main shaft is connected with the fan blade, the self-cleaning bearing is sleeved on the main shaft, and the self-cleaning bearing is arranged on the mounting table, the mounting table is arranged non-horizontally, and the oil discharge ring is arranged on the downward side of the outer ring.

[0026] Through the arrangement, when the pressure of the lubricating grease in the self-cleaning bearing is too large, the lubricating grease overflows from the lubricating layer, and due to the inclined arrangement of the main shaft, the lubricating grease flows downward and flows into the waste oil cavity of the oil discharge ring, the waste oil in the waste oil cavity flows along the oil discharge ring, and the waste oil is discharged from the oil discharge port at the bottom of the oil discharge ring, and the overflowed lubricating oil can be conveniently collected by placing a collecting bag at the oil discharge port, so that the pollution of the lubricating oil to the main shaft is greatly reduced, and the workload of cleaning and maintenance of the fan assembly is reduced.

[0027] Preferably, the rotating gap is arranged below the shaft shoulder of the main shaft, the second oil baffle is spaced apart from the shaft shoulder, and the first boss of the sealing ring is in abutment with the shaft shoulder of the main shaft.

[0028] Through the arrangement, the shaft shoulder also plays a certain sealing role, which is helpful to avoid the lubricating grease from being thrown out of the rotating gap and improve the sealing performance of the oil discharge ring; the second oil baffle is spaced apart from the shaft shoulder, so that friction between the second oil baffle and the main shaft is avoided, and the rotation of the main shaft is not affected; and the first boss of the sealing ring is in abutment with the shaft shoulder of the main shaft, so that the sealing ring is closely connected with the main shaft and rotates with the main shaft.

[0029] Compared with the prior art, the fan assembly has the following advantages:

[0030] (1) The flow of the overflowed lubricating oil in the lubricating layer is limited by the arrangement of the oil discharge ring, the overflowed lubricating oil can be collected and guided to flow out of the oil discharge port, the lubricating oil can be prevented from polluting the main shaft, and the lubricating oil in the lubricating layer is not affected, and the wear rate of the lubricating oil is not accelerated.

[0031] (2) The overflowed waste oil in the first oil collecting groove can flow out of the oil discharge port, and the waste oil is prevented from adhering to the first oil collecting groove and causing excessive accumulation and overflow from the oil discharge ring.

[0032] (3) The arrangement of the dustproof plate prevents foreign dust particles from entering the lubricating layer, reduces the wear of the bearing, and is helpful to prolong the service life of the bearing.

[0033] (4) The fan assembly guides the overflowed lubricating oil of the bearing to the oil guide ring through the inclined arrangement of the main shaft and the self-cleaning bearing, and the overflowed lubricating oil is collected and discharged by the oil guide ring, so that the pollution of the waste oil to the main shaft is avoided, and the workload of cleaning and maintenance of the fan assembly is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is the whole structure schematic view of a kind of self-cleaning bearing of the utility model;

[0035] Figure 2 It is the internal structure schematic view of a kind of self-cleaning bearing of the utility model;

[0036] Figure 3 It is Figure 2 The A partial enlarged view of;

[0037] Figure 4 It is the whole structure schematic view of a kind of fan assembly of the utility model;

[0038] Figure 5 It is the bearing and main shaft connection schematic view of a kind of fan assembly of the utility model.

[0039] The illustration mark is as follows:

[0040] 1, bearing main body;11, outer ring;12, inner ring;13, lubricating layer;2, oil discharge ring;21, waste oil cavity;22, oil drain;23, mounting plate;24, sealing ring;241, first oil collecting groove;242, first oil baffle;243, first boss;25, oil guide ring;251, second oil collecting groove;252, second oil baffle;253, second boss;254, rotating joint;3, oil scraping plate;4, dustproof plate;5, driving mechanism;6, main shaft;7, mounting table;8, fan blade. DETAILED DESCRIPTION

[0041] The utility model will be further described below in conjunction with specific implementation. Wherein, the drawing is only for example description, and it is only schematic diagram, and it cannot be understood as the limitation of the patent of this utility model;In order to better illustrate the embodiment of the utility model, some components of the drawing can be omitted, enlarged or reduced, and it does not represent the size of actual product;For those skilled in the art, it is understandable that some known structures in the drawing and its description can be omitted.

[0042] The same or similar label in the drawing of the embodiment of the utility model corresponds to the same or similar component;In the description of the utility model, it is understood that if there is the orientation or position relationship indicated by the terms "upper", "lower", "left", "right" etc., it is only for the convenience of describing the utility model and simplifying the description, and is not indicative or suggestive of the device or element indicated must have a particular orientation, a particular orientation and operation, therefore the position relationship of the term described in the drawing is only for example description, and it cannot be understood as the limitation of the patent, for the ordinary skilled in the art, the specific meaning of the above terms can be understood according to specific circumstances.

[0043] Embodiment 1

[0044] As Figures 1 to 3 The utility model discloses a first embodiment of a self-cleaning bearing, the bearing main body 1 includes the outer ring 11 and the inner ring 12, is equipped with the lubricating layer 13 between the outer ring 11 and the inner ring 12, the outer ring 11 rotates and is set in the outer ring 12, characterized by still including the oil discharge ring 2, the oil discharge ring 2 is installed in the bearing main body 1 side, is equipped with the waste oil cavity 21 in the oil discharge ring 2, the oil discharge ring 2 inner diameter is same with the inner ring 12 inner diameter, the waste oil cavity 21 is connected with the lubricating layer 13, is equipped with the oil drain 22 of oil discharge ring 2 bottom.

[0045] Through this setting mode, when using, the self-cleaning bearing is sleeved on the main shaft 6, the inner ring 12 and the oil discharge ring 2 are all in abutment with the main shaft 6;When needing lubrication, the worker adds lubricating oil to the lubricating layer 13 of bearing, when the pressure in the lubricating layer 13 is too large, the lubricating oil overflows to the main shaft 6 between the inner ring 12 and the oil discharge ring 2, and because the inner ring 12 and the oil discharge ring 2 are all in abutment with the main shaft 6, the lubricating oil can only flow to the oil discharge ring 2, the waste oil enters the waste oil cavity 21 in the oil discharge ring 2, and is discharged from the oil drain 22 at the bottom of the oil discharge ring 2 after accumulating in the waste oil cavity 21, which avoids the pollution of the lubricating oil to the main shaft 6 and reduces the workload of bearing cleaning and maintenance.

[0046] As an embodiment of the utility model, the oil discharge ring 2 includes the mounting plate 23, the sealing ring 24 and the oil guide ring 25, the mounting plate 23 is fixedly connected with the outer ring 11, the sealing ring 24 is rotatably connected with the mounting plate 23, and the oil guide ring 25 is fixedly connected with the mounting plate 23;The diameter of the oil guide ring 25 is greater than that of the sealing ring 24, and the inner diameter of the sealing ring 24 is same with that of the inner ring 12;The waste oil cavity 21 is formed between the oil guide ring 25 and the sealing ring 24, and the oil drain 22 is arranged at the bottom of the oil guide ring 25.

[0047] Through this setting mode, when using, the sealing ring 24 is sleeved on the main shaft 6 beside the bearing, preventing the lubricating oil overflowing from the lubricating layer 13 from flowing along the main shaft 6;When the lubricating oil accumulated between the inner ring 12 and the sealing ring 24 reaches a certain amount, the lubricating oil enters the waste oil cavity 21 between the sealing ring 24 and the oil guide ring 25 through the gap between the mounting plate 23 and the sealing ring 24, and the lubricating oil accumulates in the waste oil cavity 21 and is gradually discharged from the oil drain 22 under the action of gravity. The oil guide ring 25 is sleeved on the main shaft 6, and the oil drain 22 is located at the bottom of the oil guide ring 25, so that the discharged waste oil will not pollute the main shaft 6, facilitating workers to collect the waste oil and reducing the workload of cleaning and maintaining the bearing and the main shaft 6.

[0048] As an embodiment of the utility model, the sealing ring 24 is provided with the first oil collecting groove 241, the first oil collecting groove 241 is provided with the first oil baffle 242 close to one side of the inner ring 12, and the first oil baffle 242 is in abutment with the mounting plate 23.

[0049] Through the setting mode, when the lubricating oil accumulated between the inner ring 12 and the sealing ring 24 reaches a certain degree, the pressure of the lubricating oil breaks through the gap between the first oil baffle 242 and the mounting plate 23, and flows into the sealing cavity between the sealing ring 24 and the oil guide ring 25; because the main shaft 6 is in a rotating state, the waste oil is driven to overflow from all directions, and when the waste oil overflows from above the main shaft 6, the waste oil falls along the first oil baffle 242 into the first oil collecting groove 241, the first oil collecting groove 241 can avoid the waste oil being thrown out when the sealing ring 24 rotates with the main shaft 6, ensures that the waste oil is located in the waste oil cavity 21, and reduces the probability of causing secondary pollution.

[0050] As an embodiment of the utility model, the sealing ring 24 is made of elastic material such as rubber.

[0051] As an embodiment of the utility model, the included angle between the first oil baffle 242 and the first oil collecting groove 241 is greater than 90 degrees.

[0052] Through the setting mode, when the waste oil in the first oil collecting groove 241 flows to the oil guide ring 25, it is beneficial to reduce the wall hanging phenomenon of the waste oil in the first oil collecting groove 241 when flowing to the oil guide ring 25, and beneficial to the waste oil discharge.

[0053] As an embodiment of the utility model, the first oil collecting groove 241 is provided with a first boss 243 on the side, the first boss 243 is oppositely arranged with the first oil baffle 242, and the height of the first boss 243 is lower than that of the first oil baffle 242.

[0054] Through the setting mode, the first boss 243 plays a limiting role on the waste oil in the first oil collecting groove 241, avoiding the waste oil in the first oil collecting groove 241 flowing out along the extension direction of the main shaft 6.

[0055] As an embodiment of the utility model, the oil guide ring 25 is provided with a second oil collecting groove 251, the second oil collecting groove 251 is provided with a second oil baffle 252 away from the mounting plate 23, and the second oil baffle 252 and the first boss 243 form a rotating gap 254.

[0056] When installed, the rotating gap 254 is lower than the shaft shoulder. Through the setting mode, when the waste oil breaks through the sealing ring 24 and flows out from the bottom of the main shaft 6, the waste oil accumulates at the bottom of the second oil collecting groove 251, and the waste oil on the first oil collecting groove 241 is also thrown into the second oil collecting groove 251 with the rotation of the sealing ring 24, and the second oil baffle 252 is used to limit the waste oil in the second oil collecting groove 251 from flowing to the main shaft 6; because the oil guide ring 25 is fixedly arranged, the sealing ring 24 rotates with the main shaft 6, the rotating gap 254 can avoid friction between the second oil baffle 252 and the first boss 243, and the rotating gap 254 is lower than the shaft shoulder, which can avoid the waste oil flowing out from the rotating gap 254, and is beneficial to reducing the pollution of the lubricating oil to the main shaft 6.

[0057] As an embodiment of the utility model, second oil collecting groove 251 side still is equipped with second boss 253, second boss 253 is opposite with second oil baffle 252, the height of second boss 253 is lower than the height of first oil baffle 242, and second boss 253 is abutted with mounting plate 23.

[0058] Through this setting mode, second boss 253 limits waste oil in second oil collecting groove 251, avoids waste oil from the gap between oil guide ring 25 and mounting plate 23 to flow out.

[0059] Example 2

[0060] The following is a second embodiment of the utility model of a self-cleaning bearing, and the embodiment is similar to embodiment 1, the difference is that it also includes a scraping plate 3 and a dust shield 4.

[0061] As an embodiment of the utility model, it also includes a scraping plate 3, which is fixedly connected with the mounting plate 23, and the scraping plate 3 is located above the oil drain port 22, and the top of the scraping plate 3 is located between the first oil baffle 242 and the first boss 243.

[0062] The lubricating grease has certain viscosity and may adhere to the sealing ring 24 and overflow from the sealing ring 24 as the accumulation increases. Through this setting mode, the sealing ring 24 rotates with the main shaft 6, and when the sealing ring 24 rotates to the scraping plate 3, the scraping plate 3 will scrape the waste oil on the sealing ring 24, avoiding overflow caused by excessive accumulation of waste oil.

[0063] As an embodiment of the utility model, it also includes a dust shield 4, which is fixedly connected with the outer ring 11, and the dust shield 4 is symmetrically arranged with the mounting plate 23 about the outer ring 11.

[0064] Through this setting mode, dust can be prevented from entering the lubricating layer 13 of the bearing from the other side, avoiding scratching the bearing and being conducive to improving the service life of the bearing.

[0065] Example 3

[0066] As shown in Figure 4 and Figure 5 The embodiment of the utility model of a fan assembly, including driving mechanism 5, main shaft 6, mounting table 7, fan blade 8 and a self-cleaning bearing as embodiment 1 or embodiment 2, one end of main shaft 6 is connected with driving mechanism 5, the other end of main shaft 6 is connected with fan blade 8, the self-cleaning bearing is sleeved on main shaft 6, and the self-cleaning bearing is arranged on mounting table 7, the mounting table 7 is not horizontally arranged, and the oil discharge ring 2 is arranged on the downward side of the outer ring 11.

[0067] Through the setting mode, when the lubricating grease pressure in the self-cleaning bearing is too large, the lubricating grease overflows from the lubricating layer 13, and because the main shaft 6 is arranged obliquely, the lubricating grease flows downward and flows into the waste oil cavity 21 of the oil discharge ring 2, the waste oil in the waste oil cavity 21 flows along the oil discharge ring 2, and is discharged from the oil discharge port 22 at the bottom of the oil discharge ring 2, and by placing a collecting bag at the oil discharge port 22, the overflowed lubricating oil can be conveniently collected, the pollution of the lubricating oil to the main shaft 6 is greatly reduced, and the workload of cleaning and maintaining the fan assembly is reduced.

[0068] As one embodiment of the utility model, the rotation joint 254 is arranged below the shaft shoulder of the main shaft 6, the second oil baffle 252 is kept apart from the shaft shoulder, and the first boss 243 of the sealing ring 24 abuts against the shaft shoulder of the main shaft 6.

[0069] Through the setting mode, the shaft shoulder also plays a certain sealing role, which is beneficial to avoid the lubricating grease from being thrown out of the rotation joint 254 and improve the sealing performance of the oil discharge ring 2; the second oil baffle 252 is kept apart from the shaft shoulder, so that friction between the second oil baffle 252 and the main shaft 6 is avoided and the rotation of the main shaft 6 is not affected; the first boss 243 of the sealing ring 24 abuts against the shaft shoulder of the main shaft 6, so that the sealing ring 24 is connected to the main shaft 6 tightly and the sealing ring 24 rotates with the main shaft 6.

[0070] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments are not enumerated. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A self-cleaning bearing, a bearing body (1) comprising an outer ring (11) and an inner ring (12), a lubricating layer (13) being provided between the outer ring (11) and the inner ring (12), the outer ring (11) being rotatably sleeved outside the inner ring (12), characterized in that, Further comprising an oil drain ring (2) arranged beside the bearing body (1), an oil waste cavity (21) is arranged in the oil drain ring (2), the inner diameter of the oil drain ring (2) is the same as the inner diameter of the inner ring (12), the oil waste cavity (21) is communicated with the lubricating layer (13), and a drain port (22) is arranged at the bottom of the oil drain ring (2).

2. The self-cleaning bearing of claim 1, wherein, The oil drain ring (2) comprises a mounting plate (23), a sealing ring (24) and an oil guide ring (25), the mounting plate (23) is fixedly connected with the outer ring (11), the sealing ring (24) is rotatably connected with the mounting plate (23), and the oil guide ring (25) is fixedly connected with the mounting plate (23); the diameter of the oil guide ring (25) is greater than that of the sealing ring (24), and the inner diameter of the sealing ring (24) is the same as that of the inner ring (12); the oil waste cavity (21) is formed between the oil guide ring (25) and the sealing ring (24), and the drain port (22) is arranged at the bottom of the oil guide ring (25).

3. The self-cleaning bearing of claim 2, wherein, The sealing ring (24) is provided with a first oil collecting groove (241), a first oil baffle (242) is arranged on the side close to the inner ring (12) of the first oil collecting groove (241), and the first oil baffle (242) abuts against the mounting plate (23).

4. The self-cleaning bearing of claim 3, wherein, The included angle between the first oil baffle (242) and the first oil collecting groove (241) is greater than 90 degrees.

5. The self-cleaning bearing of claim 3, wherein, A first boss (243) is further arranged on the side of the first oil collecting groove (241), the first boss (243) is arranged opposite to the first oil baffle (242), and the height of the first boss (243) is lower than that of the first oil baffle (242).

6. The self-cleaning bearing of claim 5, wherein, A second oil collecting groove (251) is arranged on the oil guide ring (25), a second oil baffle (252) is arranged on the side away from the mounting plate (23) of the second oil collecting groove (251), and a rotating gap (254) is formed between the second oil baffle (252) and the first boss (243).

7. The self-cleaning bearing of claim 6, wherein, A second boss (253) is further arranged on the side of the second oil collecting groove (251), the second boss (253) is arranged opposite to the second oil baffle (252), the height of the second boss (253) is lower than that of the first oil baffle (242), and the second boss (253) abuts against the mounting plate (23).

8. The self-cleaning bearing of any one of claims 5 to 7, wherein, Further comprising an oil scraping plate (3), the oil scraping plate (3) is fixedly connected with the mounting plate (23), the oil scraping plate (3) is located above the drain port (22), and the top of the oil scraping plate (3) is located between the first oil baffle (242) and the first boss (243).

9. The self-cleaning bearing of claim 8, wherein, Further comprising a dustproof plate (4), the dustproof plate (4) is fixedly connected with the outer ring (11), and the dustproof plate (4) and the mounting plate (23) are symmetrically arranged about the outer ring (11).

10. A fan assembly characterized by, The fan comprises a driving mechanism (5), a main shaft (6), a mounting table (7), a fan blade (8) and a self-cleaning bearing according to any one of claims 1-9, one end of the main shaft (6) is connected with the driving mechanism (5), the other end of the main shaft (6) is connected with the fan blade (8), the self-cleaning bearing is sleeved on the main shaft (6), and the self-cleaning bearing is arranged on the mounting table (7), the mounting table (7) is arranged in a non-horizontal manner, and the oil discharge ring (2) is arranged on the downward side of the outer ring (11).

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