Bearing exhaust structure and fan

Abstract

The utility model belongs to the technical field of fans, and discloses a bearing exhaust structure and a fan, the bearing exhaust structure comprises a bearing seat, a bearing and a positioning ring, the bearing seat is provided with a mounting groove, the inner wall of the mounting groove is provided with a protruding part, the bearing is arranged in the mounting groove, and a first gap is reserved between the bearing and the groove bottom of the mounting groove; the bearing is provided with first exhaust channels, and / or the first exhaust channels are arranged between the bearing and the protruding part and between the bearing and the inner wall of the mounting groove, the positioning ring is located on the side, away from the protruding part, of the bearing, the bearing is pressed on the protruding part through the positioning ring, and the positioning ring is provided with second exhaust channels and / or the second exhaust channels. A second exhaust channel is arranged between the positioning ring and the inner wall of the mounting groove, the first gap and the second exhaust channel are both communicated with the first exhaust channel, and the second exhaust channel can be communicated with the external environment, so that gas in the first gap can be exhausted out of the mounting groove.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a bearing exhaust structure and a fan. Background Technology

[0002] like Figure 1 and Figure 2 As shown, a slim fan typically includes an outer frame 1', a bearing housing 2', a stator 3', a rotor 4', a bearing 5', a positioning ring 6', and a friction plate 7'. The bearing housing 2' is fixed to the outer frame 1' and has a mounting groove 21'. The friction plate 7' is located at the bottom of the mounting groove 21'. The bearing 5' is located inside the mounting groove 21'. The positioning ring 6' engages with a protrusion 22' on the inner wall of the mounting groove 21' to clamp and fix the bearing 5'. The stator 3' is fixed to the outer wall of the bearing housing 2'. The rotor 4's shaft 41' passes through and is fixed to the inner ring of the bearing 5', and the bottom of the shaft 41' is pressed against the friction plate 7'.

[0003] During the operation of the fan, friction will occur between the rotating shaft 41' and the friction plate 7', and the friction will generate corresponding gas. Since the positioning ring 6' and the bearing housing 2' are interference-fitted, the gas cannot be discharged from the mounting groove 21'. This will cause the rotating shaft 41' to rotate unstablely, which in turn will cause friction between the rotating shaft 41' and the bearing 5', shortening the service life of the bearing 5'.

[0004] Therefore, there is an urgent need to propose a bearing exhaust structure and fan to solve the above-mentioned technical problems. Utility Model Content

[0005] The first objective of this invention is to provide a bearing venting structure that can discharge gas from the first gap into the mounting groove, thereby reducing the probability of friction between the bearing and the shaft due to unstable rotation.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The bearing venting structure includes:

[0008] The bearing housing has a mounting groove, and the inner wall of the mounting groove has a protrusion.

[0009] The bearing is set in the mounting groove, and a first gap is left between the bearing and the bottom of the mounting groove. The bearing is provided with a first venting channel, and / or, a first venting channel is provided between the bearing and the protrusion and between the bearing and the inner wall of the mounting groove.

[0010] The positioning ring is located on the side of the bearing away from the protrusion and presses the bearing against the protrusion. The positioning ring is provided with a second venting channel, and / or, a second venting channel is provided between the positioning ring and the inner wall of the mounting groove.

[0011] Both the first gap and the second exhaust passage are connected to the first exhaust passage, and the second exhaust passage can be connected to the external environment.

[0012] Optionally, a cutting plane is provided on the outer wall of the positioning ring, extending from the side of the positioning ring toward the bearing to the side of the positioning ring away from the bearing, and a second venting channel is formed between the cutting plane and the inner wall of the mounting groove.

[0013] Optionally, the bearing has a first groove on the side facing the bottom of the mounting groove, the first groove is connected to the first gap, the edge of the first groove abuts against the protrusion, and a first sub-channel is formed between the first groove and the protrusion. The outer wall of the bearing has a second groove, which extends from the side of the bearing facing the protrusion to the side away from the protrusion. A second sub-channel is formed between the second groove and the inner wall of the mounting groove. The first sub-channel and the second sub-channel are connected to form a first exhaust channel.

[0014] Optionally, the wall thickness of the positioning ring is t1, the distance between the cutting plane and the inner wall of the positioning ring is t2, t1-t2=t3, and the groove depth of the second groove is t4, t3≥t4.

[0015] Optionally, there are multiple first grooves and multiple second grooves, and they correspond one-to-one, with the multiple second grooves being interconnected.

[0016] Optionally, the side of the bearing facing the locating ring is transitioned to the outer wall of the bearing by a first chamfer, and a second gap is formed between the surface of the first chamfer and the inner wall of the mounting groove, and multiple second grooves are connected through the second gap;

[0017] And / or, the side of the bearing facing the protrusion transitions with the outer wall of the bearing through a second chamfer, and a third gap is formed between the surface of the second chamfer and the inner wall of the mounting groove, and multiple second grooves are connected through the third gap.

[0018] Optionally, along a direction parallel to the radial direction of the bearing, the end of the second groove opposite to the protrusion is positioned directly opposite the cutting plane.

[0019] Optionally, a boss is provided on the side of the bearing away from the bottom of the mounting groove, and a positioning ring is sleeved on the outside of the boss and presses the bearing onto the boss.

[0020] Optionally, a positioning part is provided on the side of the boss away from the bottom of the mounting groove, and the second groove is positioned opposite the positioning part at one end away from the protrusion along a direction parallel to the radial direction of the bearing.

[0021] The second objective of this invention is to provide a fan whose bearings have a long service life.

[0022] To achieve this objective, the present invention adopts the following technical solution:

[0023] The fan includes the aforementioned bearing exhaust structure.

[0024] The beneficial effects of this utility model are:

[0025] The bearing venting structure provided by this utility model includes a first venting channel on the bearing, and / or a first venting channel between the bearing and the protrusion and between the bearing and the inner wall of the mounting groove. A second venting channel is provided on the positioning ring, and / or a second venting channel is provided between the positioning ring and the inner wall of the mounting groove. The second venting channel communicates with the first venting channel and is also open to the external environment. A first gap between the bearing and the bottom of the mounting groove communicates with the first venting channel. In practical applications, the rotating shaft passes through the inner ring of the bearing and abuts against the bottom of the mounting groove (or the friction plate on the bottom of the groove). When the rotating shaft and the bottom of the mounting groove (or the friction plate on the bottom of the groove) generate gas due to friction, the gas can pass through the first venting channel and the second venting channel sequentially from the first gap and finally be discharged into the external environment. This reduces the probability of friction between the rotating shaft and the bearing due to unstable rotation, thus extending the bearing's service life. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the assembly cross-sectional structure of the bearing housing, bearing, and locating ring in the prior art;

[0027] Figure 2 yes Figure 1 Enlarged view of a portion of point A in the middle;

[0028] Figure 3 This is a cross-sectional structural diagram of the bearing venting structure provided by this utility model;

[0029] Figure 4 yes Figure 3 Enlarged view of a section at point B in the middle;

[0030] Figure 5 This is a schematic diagram of the assembly structure of the bearing and positioning ring provided by this utility model;

[0031] Figure 6 This is a schematic diagram of the first structure of the bearing provided by this utility model;

[0032] Figure 7 This is a schematic diagram of the second structure of the bearing provided by this utility model;

[0033] Figure 8 This is a schematic diagram of the third structure of the bearing provided by this utility model;

[0034] Figure 9 This is a cross-sectional structural diagram of the positioning ring provided by this utility model.

[0035] In the picture:

[0036] 1' Outer frame; 2' Bearing housing; 21' Mounting groove; 22' Protrusion; 3' Stator; 4' Rotor; 41' Shaft; 5' Bearing; 6' Positioning ring; 7' Friction plate;

[0037] 1. Bearing housing; 11. Mounting groove; 111. Protrusion; 2. Bearing; 21. First groove; 211. First sub-channel; 22. Second groove; 221. Second sub-channel; 23. First chamfer; 24. Second chamfer; 25. Boss; 251. Positioning part; 31. First gap; 32. Second gap; 33. Third gap; 41. First exhaust channel; 42. Second exhaust channel; 5. Positioning ring; 51. Cutting plane; 6. Outer frame; 7. Stator; 8. Rotor; 81. Shaft; 9. Friction plate. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0039] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] This embodiment provides a bearing venting structure that can discharge gas from the first gap into the mounting groove, thereby reducing the probability of friction between the bearing and the shaft due to unstable rotation.

[0043] Specifically, such as Figure 2 and Figure 3 As shown, the bearing venting structure includes a bearing housing 1, a bearing 2, and a positioning ring 5. The bearing housing 1 has a mounting groove 11, and a friction plate 9 is provided at the bottom of the mounting groove 11. The inner wall of the mounting groove 11 has a protrusion 111, which extends circumferentially along the mounting groove 11 and is connected end to end. The bearing 2 is disposed in the mounting groove 11, and a first gap 31 is left between the bearing 2 and the friction plate 9. The bearing 2 has a first venting channel 41, and / or, a first venting channel 41 is provided between the bearing 2 and the protrusion 111 and between the bearing 2 and the inner wall of the mounting groove 11. The positioning ring 5 is located on the side of the bearing 2 away from the protrusion 111, and the positioning ring 5 presses the bearing 2 tightly onto the protrusion 111. The positioning ring 5 has a second venting channel 42, and / or, a second venting channel 42 is provided between the positioning ring 5 and the inner wall of the mounting groove 11. The first gap 31 and the second venting channel 42 are both connected to the first venting channel 41, and the second venting channel 42 can communicate with the external environment.

[0044] Based on the above design, the bearing 2 is provided with a first exhaust channel 41, and / or, the bearing 2 and the protrusion 111 and the bearing 2 and the inner wall of the mounting groove 11 are both provided with a first exhaust channel 41. The positioning ring 5 is provided with a second exhaust channel 42, and / or, the positioning ring 5 and the inner wall of the mounting groove 11 are provided with a second exhaust channel 42. The second exhaust channel 42 is connected to the first exhaust channel 41 and can be connected to the external environment. The first gap 31 between the bearing 2 and the bottom of the mounting groove 11 is connected to the first exhaust channel 41. In practical applications, the rotating shaft 81 is inserted through the inner ring of the bearing 2 and abuts against the friction plate 9. When the rotating shaft 81 rotates and rubs against the friction plate 9 to generate gas, the gas can pass through the first gap 31 in sequence through the first exhaust channel 41 and the second exhaust channel 42 and finally be discharged into the external environment. This reduces the probability of friction between the rotating shaft 81 and the bearing 2 due to unstable rotation, thus achieving the effect of extending the service life of the bearing 2.

[0045] It should be noted that in other embodiments, the friction plate 9 can also be omitted. In this case, a first gap 31 is left between the bearing 2 and the bottom of the mounting groove 11, and the rotating shaft 81 directly abuts against the bottom of the mounting groove 11. When the rotating shaft 81 rotates, the rotating shaft 81 and the bottom of the mounting groove 11 generate gas due to friction. The gas passes through the first exhaust channel 41 and the second exhaust channel 42 from the first gap 31 and is finally discharged into the external environment.

[0046] Optionally, such as Figure 5 As shown, a cutting plane 51 is provided on the outer side wall of the positioning ring 5. The cutting plane 51 extends from the side of the positioning ring 5 facing the bearing 2 to the side of the positioning ring 5 away from the bearing 2. A second exhaust channel 42 is formed between the cutting plane 51 and the inner wall of the mounting groove 11. The structure of opening the cutting plane 51 on the outer side wall of the positioning ring 5 is relatively simple and easy to process and form, which is conducive to improving production efficiency and reducing production costs.

[0047] In another embodiment, the second exhaust channel 42 can also be a through hole formed on the positioning ring 5, extending from the side of the positioning ring 5 toward the bearing 2 to the side away from the bearing 2, to achieve the exhaust effect. In yet another embodiment, a through groove is provided on the outer wall of the positioning ring 5, extending from the side of the positioning ring 5 toward the bearing 2 to the side away from the bearing 2, and the edge of the through groove and the inner wall of the mounting groove 11 form the second exhaust channel 42.

[0048] Optionally, such as Figures 4 to 8 As shown, the bearing 2 has a first groove 21 on the side facing the bottom of the mounting groove 11. The first groove 21 communicates with the first gap 31, and the edge of the first groove 21 abuts against the protrusion 111. A first sub-channel 211 is formed between the first groove 21 and the protrusion 111. The outer wall of the bearing 2 has a second groove 22. Along a direction parallel to the axis of the bearing 2, the second groove 22 extends from the side of the bearing 2 facing the protrusion 111 to the side away from the protrusion 111. A second sub-channel 221 is formed between the second groove 22 and the inner wall of the mounting groove 11. The first sub-channel 211 and the second sub-channel 221 communicate to form a first exhaust channel 41. This structural design is relatively simple, easy to process and form, and conducive to improving production efficiency and reducing production costs. In another embodiment, the second groove 22 may also extend along a direction surrounding the axis of the bearing 2. In yet another embodiment, the first exhaust channel 41 may also be a through hole opened on the bearing 2, one end of which communicates with the first gap 31, and the other end of which communicates with the second exhaust channel 42.

[0049] In this embodiment, the first groove 21 extends radially along the bearing 2 to facilitate machining.

[0050] Optionally, along a direction parallel to the radial direction of the bearing 2, one end of the second groove 22 facing away from the protrusion 111 is positioned directly opposite the cutting plane 51 to achieve communication between the second exhaust channel 42 and the first exhaust channel 41.

[0051] Optionally, such as Figure 6 and Figure 9 As shown, the wall thickness of the positioning ring 5 is t1, the distance between the cutting plane 51 and the inner wall of the positioning ring 5 is t2, t1-t2=t3, the groove depth of the second groove 22 is t4, t3≥t4. On the one hand, this can ensure the reliability of the connection between the second exhaust channel 42 and the first exhaust channel 41, and on the other hand, it can improve the exhaust capacity of the second exhaust channel 42, thereby achieving the effect of improving exhaust efficiency.

[0052] Furthermore, t2 ≥ 0.15 mm. For example, t2 can be 0.15 mm, 0.2 mm, or 0.3 mm, etc., to ensure that the area of ​​the positioning ring 5 near the cutting plane 51 has sufficient structural strength.

[0053] Optionally, the positioning ring 5 is a machined hardware part or a mold hardware part.

[0054] Optionally, such as Figures 5 to 8 As shown, there are multiple first grooves 21 and multiple second grooves 22, and they correspond one-to-one. The multiple second grooves 22 are interconnected, that is, there are multiple first exhaust channels 41, thereby improving exhaust efficiency. In this embodiment, there are four first exhaust channels 41, that is, there are four first grooves 21 and four second grooves 22. Of course, in other embodiments, the number of first exhaust channels 41 can also be two, three, or five, that is, there are two, three, or five first grooves 21 and two second grooves 22.

[0055] In this embodiment, there is one second exhaust channel 42, and all four first exhaust channels 41 are connected to one second exhaust channel 42. That is, there is one cutting surface 51 on the positioning ring 5, which corresponds to one of the four second grooves 22, thereby ensuring that the positioning ring 5 has sufficient structural strength. Of course, in other embodiments, there can be multiple second exhaust channels 42, that is, multiple cutting surfaces 51, and multiple cutting surfaces 51 correspond one-to-one with multiple second grooves 22. The specific number depends on the actual application requirements, and will not be listed here.

[0056] Furthermore, multiple second grooves 22 are evenly distributed along the circumference of the bearing 2, and multiple first grooves 21 are evenly distributed along the circumference of the bearing 2, so as to avoid the problem of gas accumulating in local positions within the first gap 31.

[0057] Furthermore, the side of bearing 2 facing the positioning ring 5 transitions with the outer wall of bearing 2 through a first chamfer 23. A second gap 32 is formed between the surface of the first chamfer 23 and the inner wall of the mounting groove 11. Multiple second grooves 22 are connected through the second gap 32 to achieve communication between multiple first exhaust channels 41. This structural design is relatively simple and helps reduce production difficulty and cost. The side of bearing 2 facing the protrusion 111 transitions with the outer wall of bearing 2 through a second chamfer 24. A third gap 33 is formed between the surface of the second chamfer 24 and the inner wall of the mounting groove 11. Multiple second grooves 22 are connected through the third gap 33 to achieve communication between multiple first exhaust channels 41. Of course, in other embodiments, only one of the first chamfer 23 and the second chamfer 24 can be provided, so that multiple second grooves 22 are connected only through the second gap 32 or the third gap 33, depending on the actual needs.

[0058] In another embodiment, a connecting groove is provided on the outer side wall of the bearing 2, and a plurality of second grooves 22 are connected through the connecting groove.

[0059] Optionally, a boss 25 is provided on the side of the bearing 2 away from the bottom of the mounting groove 11, and a positioning ring 5 is sleeved on the outside of the boss 25 and presses the bearing 2 onto the protrusion 111.

[0060] Furthermore, a positioning part 251 is provided on the side of the boss 25 away from the bottom of the mounting groove 11. The positioning part 251 is positioned opposite the second groove 22 in a direction parallel to the radial direction of the bearing 2. When assembling the bearing seat 1, the bearing 2 and the positioning ring 5, the position of the second groove 22 can be quickly found through the positioning part 251, so that the cutting plane 51 of the positioning ring 5 is positioned opposite the second groove 22 in a direction parallel to the radial direction of the bearing 2.

[0061] In this embodiment, the positioning part 251 is a third groove formed on the side of the boss 25 away from the bottom of the mounting groove 11, and the third groove extends radially along the bearing 2 to facilitate manufacturing. Of course, in other embodiments, the positioning part 251 can also be other structures with marking functions, such as engraving lines.

[0062] Optionally, the number of positioning parts 251 corresponds to the number of second grooves 22. During actual assembly, the cutting plane 51 of the positioning ring 5 is aligned with any one of the positioning parts 251 in the radial direction of the bearing 2. This structural design is beneficial to improving assembly efficiency.

[0063] This embodiment also provides a fan, which includes the above-mentioned bearing exhaust structure. When the rotating shaft 81 rubs against the friction plate 9 to generate gas, the gas in the first gap 31 can be discharged from the mounting groove 11 through the first exhaust channel 41 and the second exhaust channel 42, which reduces the probability of friction between the rotating shaft 81 and the bearing 2 due to unstable rotation, thereby extending the service life of the fan bearing 2.

[0064] In this embodiment, the fan is a thin fan and the bearing 2 is an oil-impregnated bearing. The gas discharge in the first gap 31 helps to reduce the internal temperature of the bearing 2, enhance the rigidity of the oil film, ensure stable operation of the fan, thereby improving the reliability of the fan operation and extending the service life of the fan.

[0065] Optionally, such as Figure 3 and Figure 4 As shown, the fan also includes an outer frame 6, a stator 7, and a rotor 8. The bearing housing 1 is fixed to the outer frame 6 by a tight fit. The stator 7 is sleeved on the outer periphery of the bearing housing 1 and fixedly connected to the bearing housing 1 by adhesive application. The bearing 2 is fitted with the mounting groove 11 of the bearing housing 1 with a first gap 31. The positioning ring 5 is interference-fitted with the mounting groove 11, and the positioning ring 5 presses the bearing 2 onto the protrusion 111 to fix the bearing 2 in the axial direction. The aforementioned rotating shaft 81 is the rotating shaft 81 of the rotor 8. The rotating shaft 81 passes through the inner ring of the bearing 2 by a first gap 31 fit, and the bottom of the rotating shaft 81 abuts against the friction plate 9.

[0066] Optionally, the outer diameter of the bearing 2 is D1, and the inner diameter of the mounting groove 11 is D2, where 0 < D2 - D1 < 0.02 mm, so as to achieve a first clearance 31 fit between the bearing 2 and the mounting groove 11 of the bearing housing 1. For example, the difference between D2 and D1 can be 0, 0.01 mm, or 0.02 mm, etc.

[0067] Optionally, the outer diameter of the positioning ring 5 is D3, and the inner diameter of the mounting groove 11 is D2, where 0.02mm < D3 - D2 < 0.05mm, so as to achieve an interference fit between the positioning ring 5 and the mounting groove 11 of the bearing seat 1. For example, the difference between D3 and D2 can be 0.02mm, 0.04mm, or 0.05mm, etc.

[0068] Optionally, the inner diameter of the positioning ring 5 is D4, and the outer diameter of the boss 25 is D5, where D4 > D5, so that the positioning ring 5 can be fitted onto the outside of the boss 25.

[0069] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A bearing venting structure, characterized in that, include: The bearing housing (1) is provided with a mounting groove (11), and the inner wall of the mounting groove (11) is provided with a protrusion (111); The bearing (2) is disposed in the mounting groove (11), and a first gap (31) is left between the bearing (2) and the bottom of the mounting groove (11). The bearing (2) is provided with a first exhaust channel (41), and / or, the first exhaust channel (41) is provided between the bearing (2) and the protrusion (111) and between the bearing (2) and the inner wall of the mounting groove (11). A positioning ring (5) is located on the side of the bearing (2) away from the protrusion (111), and the positioning ring (5) presses the bearing (2) onto the protrusion (111). The positioning ring (5) is provided with a second exhaust channel (42), and / or, the positioning ring (5) is provided with the second exhaust channel (42) between the inner wall of the mounting groove (11). The first gap (31) and the second exhaust passage (42) are both connected to the first exhaust passage (41), and the second exhaust passage (42) can be connected to the external environment.

2. The bearing venting structure according to claim 1, characterized in that, The outer wall of the positioning ring (5) is provided with a cutting plane (51). The cutting plane (51) extends from the side of the positioning ring (5) toward the bearing (2) to the side of the positioning ring (5) away from the bearing (2). The cutting plane (51) and the inner wall of the mounting groove (11) form the second exhaust channel (42).

3. The bearing venting structure according to claim 2, characterized in that, The bearing (2) has a first groove (21) on the side facing the bottom of the mounting groove (11). The first groove (21) communicates with the first gap (31). The edge of the first groove (21) abuts against the protrusion (111). A first sub-channel (211) is formed between the first groove (21) and the protrusion (111). The outer wall of the bearing (2) has a second groove (22). The second groove (22) extends from the side of the bearing (2) facing the protrusion (111) to the side of the bearing (2) away from the protrusion (111). A second sub-channel (221) is formed between the second groove (22) and the inner wall of the mounting groove (11). The first sub-channel (211) and the second sub-channel (221) communicate to form the first exhaust channel (41).

4. The bearing venting structure according to claim 3, characterized in that, The wall thickness of the positioning ring (5) is t1, the distance between the cutting plane (51) and the inner wall of the positioning ring (5) is t2, t1-t2=t3, the groove depth of the second groove (22) is t4, and t3≥t4.

5. The bearing venting structure according to claim 3, characterized in that, The number of the first groove (21) and the number of the second groove (22) are both multiple and correspond one-to-one, and the multiple second grooves (22) are interconnected.

6. The bearing venting structure according to claim 5, characterized in that, The side of the bearing (2) facing the positioning ring (5) is transitioned to the outer wall of the bearing (2) by a first chamfer (23), and a second gap (32) is formed between the surface of the first chamfer (23) and the inner wall of the mounting groove (11). A plurality of second grooves (22) are connected through the second gap (32). And / or, the side of the bearing (2) facing the protrusion (111) is transitioned to the outer wall of the bearing (2) by a second chamfer (24), and a third gap (33) is formed between the surface of the second chamfer (24) and the inner wall of the mounting groove (11), and a plurality of the second grooves (22) are connected through the third gap (33).

7. The bearing venting structure according to any one of claims 3-6, characterized in that, Along a direction parallel to the radial direction of the bearing (2), the end of the second groove (22) opposite to the protrusion (111) is positioned opposite the cutting plane (51).

8. The bearing venting structure according to claim 7, characterized in that, The bearing (2) has a boss (25) on the side away from the bottom of the mounting groove (11). The positioning ring (5) is sleeved on the outside of the boss (25) and presses the bearing (2) onto the protrusion (111).

9. The bearing venting structure according to claim 8, characterized in that, The boss (25) has a positioning part (251) on the side away from the bottom of the mounting groove (11). Along the direction parallel to the radial direction of the bearing (2), the end of the second groove (22) away from the protrusion (111) is directly opposite to the positioning part (251).

10. A fan, characterized in that, Includes the bearing venting structure as described in any one of claims 1-9.

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