An oil return fan

Abstract

The utility model provides an oil return fan, including fan frame and the fan blade and rotor of setting in fan frame, the fan blade is connected in the rotor, the rotor is connected with fan frame rotation, is equipped with the middle pipe in fan frame, is equipped with the installation groove in the middle pipe, and the installation groove is equipped with magnet, magnetic cover, card and oil bearing in proper order from the bottom, is equipped with the edge piece in the installation groove top, is equipped with the inner hole in the oil bearing, is equipped with the rotating shaft in the inner hole, and one end is connected in the rotor, and the other end is connected with magnet magnetism, oil bearing surface is equipped with a plurality of oil groove, and the first oil chamber is formed between top and the edge piece, and the second oil chamber is formed between bottom and magnet, and the first oil chamber, oil groove, the second oil chamber and the inner hole form bearing oil self -circulation loop together, the closed space is formed through the edge piece and oil chamber design, and the linkage of multistage oil groove and double oil chamber makes lubricating oil automatic circulation along the preset loop under centrifugal force drive, and the magnetic attraction offsets the fan blade buoyancy, avoids the shaft to move.

Description

Technical Field

[0001] This utility model belongs to the field of fan technology, specifically relating to an oil return fan. Background Technology

[0002] In the existing field of oil-impregnated bearing fans, a common technical challenge is the easy loss of bearing oil. When the fan operates at high speed, the lubricating oil generated by the friction between the shaft and the oil-impregnated bearing tends to rise along the shaft and splash out from the top gap of the bearing mounting slot. After long-term operation, the continuous reduction in oil volume leads to lubrication failure, increased frictional resistance, resulting in increased noise, rotor jamming, and even equipment damage. Traditional solutions mainly involve adding seals or optimizing the oil injection volume, but the sealing structure struggles to balance shaft clearance and sealing, while excessive oil injection exacerbates oil scattering. Furthermore, magnet fixing often relies on snap-fit ​​or injection molding processes; the former lacks stability and is prone to displacement, while the latter is susceptible to demagnetization in high-temperature environments. These problems severely restrict the lifespan and reliability of fans, necessitating an innovative structure that can autonomously maintain oil balance and achieve efficient recycling of bearing oil. Utility Model Content

[0003] (1) Technical problems to be solved

[0004] This invention provides an oil return fan, which aims to solve problems such as lubricant loss.

[0005] (2) Technical solution

[0006] This utility model provides an oil return fan, including a fan frame, fan blades and a rotor disposed within the fan frame, the fan blades being connected to the rotor, the rotor being rotatably connected to the fan frame, a central tube being disposed within the fan frame, a mounting groove being disposed within the central tube, a magnet, a magnetic sleeve, a card and an oil-impregnated bearing being disposed sequentially from the bottom of the mounting groove, an edge-sealing piece being disposed at the top of the mounting groove, an inner hole being disposed within the oil-impregnated bearing, a rotating shaft being disposed within the inner hole, one end of the rotating shaft being connected to the rotor, and the other end being magnetically connected to the magnet;

[0007] The oil-impregnated bearing has several oil grooves on its surface, a first oil cavity is formed between the top and the edge piece, and a second oil cavity is formed between the bottom and the magnet. The first oil cavity, oil grooves, second oil cavity and inner hole together form a bearing oil self-circulation loop.

[0008] Furthermore, the oil groove of the oil-impregnated bearing includes a top groove disposed at the top and / or bottom, a side groove disposed on the side, and an inner groove disposed on the inner wall of the inner hole.

[0009] Furthermore, the inner groove includes a "V"-shaped groove and a plurality of groove rings arranged around the "V"-shaped groove, wherein the "V" of the different groove rings points in different directions.

[0010] Furthermore, the top groove is an arc-shaped groove arranged in a ring array around the inner hole.

[0011] Furthermore, the magnetic sleeve is provided with a first through hole and a second through hole. The diameter of the first through hole is smaller than that of the second through hole. The second through hole and the bottom of the mounting groove together form a snap-fit ​​position for snapping the magnet. The rotating shaft passes through the first through hole and is magnetically connected to the magnet.

[0012] Furthermore, the end of the rotating shaft connected to the magnet has an arc-shaped surface.

[0013] Furthermore, the two ends of the rotating shaft are provided with a first slot and a second slot, which respectively engage with the edge banding and the card.

[0014] Furthermore, the bottom of the first slot is provided with a stepped surface, and the height of the stepped surface is higher than the height of the top of the oil-impregnated bearing.

[0015] Furthermore, the card is made of elastic material and has a card hole. Several openings are connected around the card hole. When the shaft end of the rotating shaft passes through the card hole, the opening expands until the card hole is engaged with the second card slot, and the opening springs back to its original position.

[0016] Furthermore, the rotor has a fixed seat facing the fan frame, the fixed seat has a fixed groove, one end of the rotating shaft is riveted to the fixed groove, and the inner side of the fixed groove has an exhaust groove.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] The design of the edge-sealing parts and oil chambers forms a physically enclosed space. Combined with the multi-stage oil grooves and the linkage of the dual oil chambers, the lubricating oil automatically circulates along a preset circuit (first oil chamber → oil groove → second oil chamber → bearing inner hole) under the drive of centrifugal force. The partition design of the top groove and the side groove can intelligently respond to different oil level states—when the oil volume is low, the top groove guides the flow, and when the oil volume is high, the side groove efficiently guides the flow, ensuring smooth oil flow under various working conditions. The magnetic sleeve snap-fit ​​structure avoids the risks of high-temperature injection molding. Through the double locking of through hole nesting and snap-fit ​​position, the magnet is stably fixed with zero displacement. The magnetic attraction counteracts the buoyancy of the fan blades and avoids shaft movement. The exhaust groove design eliminates the risk of shaft detachment caused by thermal expansion and contraction. Overall, the fan's energy efficiency ratio and service life are improved. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is an exploded view of the present invention.

[0021] Figure 3 A cross-sectional view of this utility model Figure 1 .

[0022] Figure 4 This is a diagram showing the usage state of this utility model.

[0023] Figure 5 This is a schematic diagram of the oil-impregnated bearing structure of this utility model. Figure 1 .

[0024] Figure 6 This is a schematic diagram of the oil-impregnated bearing structure of this utility model. Figure 2 .

[0025] Figure 7 This is an enlarged view of the bushing of this utility model.

[0026] Figure 8 This is an enlarged schematic diagram of the rotating shaft slot of this utility model.

[0027] Figure 9 This is a schematic diagram of the card structure of this utility model.

[0028] Figure 10 This is an enlarged view of the card of this utility model.

[0029] Figure 11 This is a schematic diagram of the installation of the rotating shaft of this utility model.

[0030] Figure 12 This is a schematic diagram of the mounting base structure of this utility model.

[0031] Reference numerals: 1-fan frame, 11-middle tube, 12-mounting groove, 2-rotor, 21-fan blade, 22-fixed seat, 221-fixed groove, 23-exhaust groove, 3-magnet, 31-second oil cavity, 4-magnetic sleeve, 41-first through hole, 42-second through hole, 43-clamping position, 5-card, 51-clamping hole, 52-opening, 6-oil-impregnated bearing, 61-inner hole, 62-oil groove, 621-top groove, 622-side groove, 623-inner groove, 624-groove ring, 7-edging piece, 71-first oil cavity, 8-rotating shaft, 81-shaft end, 82-first clamping groove, 821-step surface, 83-second clamping groove. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0033] like Figure 1-4As shown, this utility model provides an oil return fan, including a fan frame 1, fan blades 21 and a rotor 2 disposed in the fan frame 1, a plurality of fan blades 21 connected to the outside of the rotor 2, the rotor 2 being rotatably connected to the fan frame 1, the fan frame 1 having an upwardly extending central tube 11, the central tube 11 having a cylindrical mounting groove 12, the mounting groove 12 having a magnet 3, a magnetic sleeve 4, a card 5 and an oil-impregnated bearing 6 arranged sequentially from the bottom, the mounting groove 12 also having an edge-sealing piece 7 at the top, the edge-sealing piece 7 covering the mounting groove 12 to form a relatively closed space, making it difficult for the bearing oil in the mounting groove 12 to be thrown out;

[0034] The oil-impregnated bearing 6 has a through inner hole 61, and a rotating shaft 8 is provided in the inner hole 61. One end of the rotating shaft 8 is connected to the rotor connection 2, and the other end extends toward the central tube 11, passing through the edge banding 7, the oil-impregnated bearing 6, the card 5, and the magnetic sleeve 5 in sequence, and finally contacts and magnetically connects with the magnet 3. The surface of the oil-impregnated bearing 6 is provided with several oil grooves 62. A first oil cavity 71 is formed between the top and the edge banding 7, and a second oil cavity 31 is formed between the bottom and the magnet 3. The first oil cavity 71, the oil grooves 62, the second oil cavity 31 and the inner hole 61 together form a bearing oil self-circulation loop.

[0035] When the rotating shaft 8 rotates at high speed, the bearing oil in the tiny gap of the oil-impregnated bearing 6 will overflow into the inner hole 61 and come into contact with the rotating shaft 8, which will play a role in lubrication and reducing friction. However, in this process, the traditional design will have some problems. Under long-term operation, the bearing oil will overflow from the mounting groove 112 and lose, reducing the bearing oil content, thereby increasing the friction between the rotating shaft 8 and the oil-impregnated bearing 6. In severe cases, the fan will seize up and the internal device will be damaged.

[0036] To address this issue, the mounting groove 12 is initially partially enclosed by the edge-sealing component 7 to reduce significant bearing oil loss. However, since a hole needs to be provided at the center of the edge-sealing component 7 for the rotating shaft 8 to pass through, and the bearing oil moves upward along the shaft 8 under high-speed rotation, passing through the hole in the center of the edge-sealing component 7, resulting in a small amount of loss. Furthermore, under prolonged continuous operation, the bearing oil accumulates on one side due to centrifugal force, eventually leading to insufficient oil on the other side, failing to provide lubrication. Additionally, the high-speed rotation of the shaft 8 inevitably causes the temperature of the oil-impregnated bearing 6, especially the inner wall of the inner bore 61, to rise. To solve this problem, the mounting groove 12 is partially enclosed by the edge-sealing component 7. The first oil chamber 71 is provided between the bearing oil and the edge-sealing part 7. When the bearing oil moves upward along the rotating shaft 8, it passes through the first oil chamber 71 and enters the first oil chamber 71 under the action of centrifugal force. While the bearing oil circulates in the first oil chamber 71, it also moves downward from the oil groove 62 on the surface of the oil-impregnated bearing 6 until it enters the second oil chamber 31. When the bearing oil circulates in the second oil chamber 31, some of the bearing oil will enter the inner hole 61 and move upward along the rotating shaft 8 back to the first oil chamber 71. This process is repeated to achieve self-circulation in the mounting groove 112, so that the bearing oil will not overflow from the mounting groove 12 and can be lubricated in all directions, avoiding insufficient oil content in some areas. At the same time, the circulation loop can also carry away heat and reduce the temperature.

[0037] Specifically, such as Figure 5 As shown, in one embodiment of this utility model, the oil groove 62 of the oil-impregnated bearing 6 includes a top groove 621 disposed on the top and a side groove 622 disposed on the side. The top groove 621 is connected to the first oil chamber 71. When the bearing oil moves upward along the rotating shaft 8, it will first enter the top of the oil-impregnated bearing 6 under the action of centrifugal force. By providing several top grooves 621 on the top, the bearing oil can be guided into the side wall of the oil-impregnated bearing 6.

[0038] And from Figure 5 As can be seen, the top port of the top groove 621 is not connected to the side groove 622, but is located between the two side grooves 622. That is to say, the bearing oil in the top groove 621 does not move downward through the side groove 622. This design is because when the bearing oil content in the first oil cavity 71 is small, it can be guided into the side wall of the oil-impregnated bearing 6 through the top groove 621. And because the content is small, the gap between the side wall of the oil-impregnated bearing 6 and the inner side wall of the mounting groove 12 is sufficient for a small amount of bearing oil to move downward. However, when the bearing oil content in the first oil cavity 71 is small to large, or even large enough to directly submerge the top groove 621, it will enter the side groove 622 with a larger diameter under the action of centrifugal force and then move downward through the side groove 622.

[0039] Furthermore, such as Figure 5 As shown, the top groove 621 is an arc-shaped groove and is arranged in a ring around the inner hole 61. The arc shape, combined with the rotation of the rotating shaft 8, "throws" the bearing oil into the top groove 621. The resulting trend is exactly arc-shaped, and the arc-shaped groove can fit this trend perfectly. Compared with a straight groove, it reduces the loss of kinetic energy and increases the thrust on the bearing oil to move downward.

[0040] Furthermore, such as Figure 6 As shown, the inner bore 61 of the oil-impregnated bearing 6 is also provided with an inner groove 623. The inner groove 623 can store bearing oil. Specifically, when the rotating shaft 8 rotates at high speed, a temperature difference and pressure difference will be generated between it and the inner wall of the inner bore 61, causing the bearing oil to seep out from the tiny gaps of the oil-impregnated bearing 6 to form an oil film, which plays a role in lubrication and reducing friction. However, under the action of rotation, the seeping bearing oil will move upward along the rotating shaft 8. At this time, the setting of the inner groove 623 can retain a part of the bearing oil, reduce the amount of bearing oil loss, and enhance the lubrication effect. The inner groove 623 is composed of four groove rings 624, which are parallel to each other and vertically spaced apart. Each groove ring 624 is formed by multiple "V"-shaped grooves arranged around it. This structural design is to conform to the rotation trend of the rotating shaft 8 and increase the oil storage capacity of the groove rings 624. The "V" shapes of the two middle groove rings 624 and the two outer groove rings 624 point in opposite directions. This structural design is to adapt to different rotation directions of the rotating shaft 8, so that it can achieve the oil storage effect whether it rotates clockwise or counterclockwise.

[0041] Specifically, such as Figure 7 As shown in one embodiment of this utility model, traditional fans typically use two methods to install the magnet 3: directly snapping it into the bottom of the mounting groove 12 or using secondary injection molding. Both methods may encounter problems, such as unstable snapping or demagnetization of the magnet 3 due to the high temperature of injection molding. To solve these problems, a magnetic sleeve 4 is provided. The magnetic sleeve 4 has a first through hole 41 and a second through hole 42. The diameter of the first through hole 41 is smaller than that of the second through hole 42, and the diameter of the magnet 3 is approximately the same as that of the second through hole 42. During installation, the magnet 2 is placed into the second through hole 42, and then the magnetic sleeve 4 is snapped into the bottom of the mounting groove 12. The second through hole 42 and the bottom of the mounting groove 12 together form a snap-fit ​​position 43 for snapping the magnet 3, so that the magnet 2 is covered by the magnetic sleeve 4 and securely fixed.

[0042] Furthermore, such as Figure 7As shown, the rotating shaft 8 passes through the first through hole 41 and is magnetically connected to the magnet 3. When the fan blade 21 is in use, it generates an upward buoyancy, which drives the rotating shaft 8 to move upward. The magnet 3 is magnetically connected to the shaft end 81 of the rotating shaft 8 to counteract this buoyancy, ensuring that the rotating shaft 8 will not shift and that the fan can be used normally. The shaft end 81 of the rotating shaft 8 is an arc-shaped surface. This structure can reduce the friction between the shaft end 81 and the magnet 3 and increase the service life.

[0043] Specifically, such as Figure 8 As shown, in one embodiment of this utility model, the two ends of the rotating shaft 8 are provided with a first slot 82 and a second slot 83. The first slot 82 and the second slot 83 are respectively engaged with the edge banding 7 and the card 5. This structural design can stop the rotating shaft 8 inside the middle tube 11 and prevent the rotating shaft 8 from detaching from the middle tube 11, thereby ensuring the normal use of the magnetic attraction fan.

[0044] Furthermore, such as Figure 8 As shown, the bottom of the first slot 82 is provided with a stepped surface 821. The height of the stepped surface 821 is higher than the height of the top of the oil-impregnated bearing 6. If the height of the stepped surface 821 is low (lower than the top of the oil-impregnated bearing 6), when the bearing oil moves upward along the rotating shaft 8, it will first enter the first slot 82. At this time, the centrifugal force may not be enough to "throw" the bearing oil into the top slot 621. Therefore, the height of the stepped surface 821 is increased so that it is higher than the top of the oil-impregnated bearing 6. In this way, the distance between the bearing oil and the top slot 621 is shortened, and the bearing oil can easily enter, making the circulation of the bearing oil smoother.

[0045] Specifically, such as Figure 9-10 As shown, in one embodiment of this utility model, the card 5 is made of elastic material and has a card hole 51. The card hole 51 is surrounded by several strip-shaped openings 52. During installation, when the shaft end 81 of the rotating shaft 8 passes through the card hole 51 from top to bottom, the opening 52 will expand until the card hole 51 is engaged with the second card slot 83, and the opening 52 springs back to its original position.

[0046] Specifically, such as Figure 11-12 As shown in one embodiment of this utility model, the rotor 2 is provided with a fixed seat 22 facing the fan frame 1. One end of the rotating shaft 8 is riveted to the fixed seat 22. The inner side of the fixed seat 22 is provided with an exhaust groove 23, which is used to discharge the air in the fixed seat 22 when the rotating shaft 8 is riveted and installed. If the exhaust groove 23 is not provided, air will remain in the fixed seat 22 after riveting. When the temperature changes, the residual air will push the rotating shaft 8 out of the fixed seat 22, causing the rotating shaft 8 to separate from the rotor 2, affecting the normal use of the fan.

[0047] The working principle of this utility model is explained in detail below:

[0048] The working principle of this oil return fan is based on a closed-loop oil circulation driven by centrifugal force: Start-up phase: The rotor drives the shaft to rotate at high speed. Lubricating oil in the inner bore of the oil-impregnated bearing rises along the shaft surface due to frictional heat and centrifugal force. Oil rise and temporary storage: When the oil reaches the top of the shaft, it is blocked by the sealing element and flows into the first oil chamber. Under strong centrifugal force, the oil is thrown towards the arc-shaped top groove (for low oil levels) or side groove (for high oil levels) on the top of the oil-impregnated bearing, detaching from the shaft's adsorption. Oil flow downward and recovery: The oil flows through the oil groove to the bottom of the oil-impregnated bearing and accumulates in the second oil chamber. Some oil forms an oil film at the gap between the magnet and the shaft, while the remaining oil re-permeates into the inner bore of the oil-impregnated bearing under pressure difference, replenishing the lubrication interface. Circulation maintenance: The oil in the inner bore moves upward again with the rotation of the shaft, forming a closed-loop circuit of "first oil chamber → oil groove → second oil chamber → inner bore". The magnetic attraction between the magnet and the end of the shaft counteracts the buoyancy of the fan blades, ensuring axial stability of the shaft; the magnetic sleeve and the mechanical locking structure of the card prevent the shaft from dislodging, ensuring the integrity of the oil passage space. The entire process requires no external intervention, achieving zero-loss self-circulation of bearing oil.

[0049] The innovation of this utility model lies in:

[0050] Solving the oil loss problem: A physically enclosed space is formed by the edge-sealing component and the oil cavity design. Combined with the multi-stage oil groove and the linkage of the dual oil cavities, the lubricating oil automatically circulates along a preset circuit (first oil cavity → oil groove → second oil cavity → bearing inner hole) under the drive of centrifugal force, eliminating overflow; Adaptive oil volume adjustment capability: The partition design of the top groove and the side groove can intelligently respond to different oil level states—when the oil volume is low, the top groove guides the flow, and when the oil volume is high, the side groove efficiently guides the flow, ensuring smooth oil flow under various operating conditions; Upgraded magnet fixing reliability: The magnetic sleeve snap-fit ​​structure avoids the risks of high-temperature injection molding. Through the through-hole nesting and snap-fit ​​double locking, the magnet is stably fixed with zero displacement; Comprehensive performance optimization: Oil circulation reduces friction loss and extends bearing life; Magnetic attraction counteracts the buoyancy of the fan blades and avoids shaft movement; The exhaust groove design eliminates the risk of shaft detachment caused by thermal expansion and contraction; Overall improvement of fan energy efficiency ratio and service life.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

[0052] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An oil return fan, characterized in that, The fan frame (1) includes a fan blade (21) and a rotor (2) disposed within the fan frame (1). The fan blade (21) is connected to the rotor (2). The rotor (2) is rotatably connected to the fan frame (1). The fan frame (1) is provided with a central tube (11). The central tube (11) is provided with a mounting groove (12). The mounting groove (12) is provided with a magnet (3), a magnetic sleeve (4), a card (5), and an oil-impregnated bearing (6) in sequence from the bottom. The mounting groove (12) is provided with a edging piece (7) at the top. The oil-impregnated bearing (6) is provided with an inner hole (61). The inner hole (61) is provided with a rotating shaft (8). One end of the rotating shaft (8) is connected to the rotor (2), and the other end is magnetically connected to the magnet (3). The oil-impregnated bearing (6) has several oil grooves (62) on its surface. A first oil cavity (71) is formed between the top and the edge piece (7), and a second oil cavity (31) is formed between the bottom and the magnet (3). The first oil cavity (71), the oil grooves (62), the second oil cavity (31) and the inner hole (61) together form a bearing oil self-circulation loop.

2. The oil return fan according to claim 1, characterized in that, The oil groove (62) of the oil-impregnated bearing (6) includes a top groove (621) provided at the top and / or bottom, a side groove (622) provided on the side, and an inner groove (623) provided on the inner wall of the inner hole (61).

3. The oil return fan according to claim 2, characterized in that, The inner groove (623) includes a "V" shaped groove and a plurality of groove rings (624) arranged around the "V" shaped groove, and the "V" of different groove rings (624) have different pointing directions.

4. The oil return fan according to claim 2, characterized in that, The top groove (621) is an arc-shaped groove, arranged in a ring array around the inner hole (61).

5. The oil return fan according to claim 1, characterized in that, The magnetic sleeve (4) is provided with a first through hole (41) and a second through hole (42). The diameter of the first through hole (41) is smaller than that of the second through hole (42). The second through hole (42) and the bottom of the mounting groove (12) form a snap-fit ​​position for snapping the magnet (3). The rotating shaft (8) passes through the first through hole (41) and is magnetically connected to the magnet (3).

6. The oil return fan according to claim 5, characterized in that, The shaft end (81) connecting the rotating shaft (8) and the magnet (3) is an arc-shaped surface.

7. The oil return fan according to claim 1, characterized in that, The rotating shaft (8) has a first slot (82) and a second slot (83) at both ends, and the first slot (82) and the second slot (83) are respectively engaged with the edge banding (7) and the card (5).

8. The oil return fan according to claim 7, characterized in that, The bottom of the first slot (82) is provided with a stepped surface (821), and the height of the stepped surface (821) is higher than the height of the top of the oil-impregnated bearing (6).

9. The oil return fan according to claim 7, characterized in that, The card (5) is made of elastic material and has a card hole (51). Several openings (52) are connected around the card hole (51). When the shaft end (81) of the rotating shaft (8) passes through the card hole (51), the opening (52) expands until the card hole (51) is engaged with the second card slot (83) and the opening (52) springs back to its original position.

10. The oil return fan according to claim 1, characterized in that, The rotor (2) is provided with a fixed seat (22) facing the fan frame (1). The fixed seat (22) is provided with a fixed groove (221). One end of the rotating shaft (8) is riveted to the fixed groove (221). The inner side of the fixed groove (221) is provided with an exhaust groove (23).

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