Waterproof fan with waterproof cover and potting glue structure

Abstract

The utility model relates to fan technical field, concretely disclose a waterproof fan with waterproof cover, potting glue structure, including outer frame, circuit board, waterproof cover, motor, impeller and sealant. The bottom of outer frame inboard is equipped with the mounting groove, and the circuit board is fixed in the mounting groove, and the waterproof cover is fixed in the mounting groove open end and is equipped with the pinhole, and the pin of motor passes through the pinhole and is electrically connected with the circuit board. The impeller includes the wheel hub with motor transmission connection and the movable blade distribution in the outer periphery, and the wheel hub edge bottom surface is lower than waterproof cover edge top surface, and the both radial dislocation forms the passageway. The sealant covers waterproof cover upper end, and fills the gap of waterproof cover and mounting groove and the gap of pin and pinhole. The fan realizes multiple waterproof through the cooperation of passageway, waterproof cover and sealant, avoids the direct contact of electronic component with potting glue and is damaged, is applicable to the outdoor severe environment, and the waterproof dustproof performance is good, and the reliability is high.

Description

Technical Field

[0001] This utility model relates to the field of waterproof fan technology, and in particular to a waterproof fan with a waterproof cover and potting compound structure. Background Technology

[0002] Outdoor equipment such as charging piles and photovoltaic systems generate a lot of heat when they are in operation, and usually need to be cooled by waterproof fans. These fans are exposed to the outdoor environment for a long time and are constantly subjected to harsh conditions such as rain and mud erosion, which puts forward high requirements for dust and water resistance, often requiring them to meet the IP68 standard.

[0003] Existing patent document CN208870819U discloses a high-efficiency waterproof fan, which separates the stator and circuit board into upper and lower accommodating cavities through a special structure of the horizontal partition in the fan frame. The circuit board, PIN pins, and the gap between the bottom cover and the lower end of the outer frame are sealed with potting compound to prevent dust and water from entering the fan due to vibration when the fan is running at high speed. This avoids the fan's performance degradation and lifespan reduction. The overall structure is stable and easy to install and position, and the dustproof and waterproof rating can reach IP68.

[0004] However, the existing waterproof fans still have obvious shortcomings: on the one hand, the method of directly wrapping the PCBA with potting compound makes the electronic components susceptible to damage due to the curing stress of the potting compound and the effects of thermal expansion and contraction, and assembly is difficult; on the other hand, foreign objects such as dust and water may still enter the rotation gap between the magnet and the shaft, thereby corroding the internal structure such as the iron shell, shaft, and bearings, making it difficult to meet the long-term reliable use requirements in harsh outdoor environments. Utility Model Content

[0005] The purpose of this utility model is to provide a waterproof fan with a waterproof cover and potting compound structure to solve the problems of existing waterproof fans that use potting compound to directly wrap the PCBA, which makes electronic components susceptible to damage due to the curing stress of the potting compound and thermal expansion and contraction, makes assembly difficult, and makes it easy for dust and rainwater to enter the gap between the magnet and the shaft core and corrode the internal iron shell, shaft core, bearing and other structures, making it difficult to meet the high reliability waterproof requirements in harsh outdoor environments.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A waterproof fan with a waterproof cap and potting compound structure, comprising: The outer frame has a mounting groove on its inner bottom side; The circuit board is fixed in the mounting slot; A waterproof cap is fixed to the open end of the mounting groove to seal the mounting groove. The waterproof cap has through pin holes. The motor includes pins, the lower ends of which pass through pin holes and are electrically connected to the circuit board; The impeller includes a hub that is connected to the motor for transmission, and movable blades distributed around the outer periphery of the hub. The bottom edge of the hub is lower than the top edge of the waterproof cover. The hub and the waterproof cover are radially offset to form a channel. A sealant is applied to the upper end of the waterproof cover, filling the gap between the waterproof cover and the mounting groove, as well as the gap between the pin and the pin hole.

[0007] Specifically, the upper end of the waterproof cover is provided with a groove, the edge of the groove forms a rim, and the outer wall of the rim and the inner wall of the mounting groove form an annular groove with a cross-section that is larger at the top and smaller at the bottom. The sealant includes a first sealing layer filling the inner side of the groove and a second sealing layer filling the annular groove.

[0008] Specifically, the outer frame is provided with a number of fixed blades, which are distributed around the outside of the mounting groove.

[0009] Specifically, a sleeve is provided in the middle of the mounting groove; The motor also includes: A copper sleeve is fitted axially onto the sleeve base; The shaft is rotatably mounted inside the copper sleeve; An iron core is fitted around the outside of the shaft core, and a coil electrically connected to the pin is wound on the shaft core; A magnetic sleeve is fixed to the inner side of the hub, and the shaft core is fixedly connected to the magnetic sleeve; A magnet is fixed inside the magnetic sleeve, and there is a rotational gap between the magnet and the iron core.

[0010] Specifically, the motor also includes at least two bearings axially sleeved on the outside of the shaft core, and the copper sleeve has an inner groove for the bearings to be engaged.

[0011] Specifically, an elastic element is provided between the uppermost bearing and the magnetic sleeve, and the elastic element is sleeved on the outside of the shaft core.

[0012] Specifically, the elastic element is a conical spring, a rectangular spring, or a spring sheet.

[0013] Specifically, the bearing located at the bottom is constrained at the lower end of the shaft core by a retaining ring, and the lower end of the shaft core is provided with an annular groove that cooperates with the retaining ring.

[0014] Specifically, the inner bottom of the hub is provided with several limiting protrusions, and the top surface of the magnetic sleeve is provided with several limiting grooves that cooperate with the limiting protrusions.

[0015] Specifically, the lower outer side of the copper sleeve is provided with several circumferentially distributed and vertically extended limiting teeth, and the inner side of the sleeve base is provided with tooth grooves that cooperate with the limiting teeth.

[0016] Beneficial effects: This application uses a waterproof cover to seal the mounting groove, and sealant to fill the gap between the waterproof cover and the mounting groove, as well as the gap between the pins and the pin holes. This places the circuit board in a sealed space and eliminates the need for potting the circuit board surface, preventing electronic components from directly contacting the potting compound and being affected by curing stress and thermal expansion and contraction. At the same time, the hub and the waterproof cover are radially misaligned to form a channel, effectively preventing rainwater, mud, and other substances from directly entering the rotation gap between the magnet and the shaft, preventing corrosion of internal components. The groove on the waterproof cover and the surrounding edge form an annular groove, which forms a double sealing layer after potting, further isolating moisture and achieving triple waterproof protection. It can reach the IP86 waterproof rating, significantly improving the fan's waterproof and dustproof performance, reliability, and service life in harsh environments such as outdoors, deserts, and seas, and is easy to assemble. Attached Figure Description

[0017] Figure 1 This is a perspective view of the waterproof fan in this embodiment; Figure 2 The explosion of the waterproof fan in this embodiment Figure 1 ; Figure 3 The explosion of the waterproof fan in this embodiment Figure 2 ; Figure 4 The explosion of the shaft core, magnetic sleeve, magnet, and impeller in this embodiment. Figure 1 ; Figure 5 The explosion of the shaft core, magnetic sleeve, magnet, and impeller in this embodiment. Figure 2 ; Figure 6 This is a perspective sectional view of the waterproof fan in this embodiment; Figure 7 for Figure 6 Enlarged view of section A; Figure 8 The three-dimensional outer frame of this embodiment Figure 1 ; Figure 9 The three-dimensional outer frame of this embodiment Figure 2 .

[0018] Reference numerals: Outer frame 10, mounting groove 11, circuit board 20, waterproof cover 30, pin hole 31, motor 40, pin 41, impeller 50, hub 51, movable blade 52, channel 12, sealant 60, groove 32, rim 33, annular groove 34, first sealing layer 61, second sealing layer 62, fixed blade 13, sleeve 14, copper sleeve 42, limiting tooth 421, shaft core 43, annular groove 431, iron core 44, magnetic sleeve 45, limiting groove 451, magnet 46, bearing 47, elastic element 48, buckle 49, limiting protrusion 511, wire 70, terminal head 80, label 90. Detailed Implementation

[0019] This utility model provides a waterproof fan with a waterproof cover and potting compound structure. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes the utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0020] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, 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 limiting this utility model.

[0021] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0022] like Figure 1 and Figure 2 As shown, this embodiment discloses a waterproof fan with a waterproof cover and potting compound structure, including an outer frame 10, a circuit board 20, a waterproof cover 30, a motor 40, an impeller 50, and a sealant 60. This waterproof fan is mainly used in outdoor equipment such as charging piles and photovoltaic systems to dissipate heat from the equipment in harsh environments (such as rain and dust erosion). This application forms multiple layers of waterproof protection through the cooperation of the waterproof cover 30 and the sealant 60, while preventing electronic components from being damaged by direct contact with the potting compound.

[0023] The outer frame 10 serves as the main support structure for the waterproof fan, and its internal structure includes a mounting groove 11 (such as...). Figure 8As shown), mounting slot 11 is used to accommodate and secure other components. Figure 2 As shown, the circuit board 20 is fixed inside the mounting slot 11, serving as the core electronic component controlling the operation of the motor 40. A waterproof cover 30 is fixed to the open end of the mounting slot 11 to seal it, thereby isolating the circuit board 20 from the outside environment. (Reference) Figure 6 and Figure 7 The waterproof cover 30 has a through pin hole 31. The lower end of the pin 41 of the motor 40 passes through the pin hole 31 and is electrically connected to the circuit board 20 to realize power transmission. The sealant 60 covers the upper end of the waterproof cover 30 and fills the gap between the waterproof cover 30 and the mounting groove 11, as well as the gap between the pin 41 and the pin hole 31.

[0024] With the above structure, the waterproof cover 30 seals the mounting groove 11, so that the circuit board 20 is located inside the mounting groove 11. With the full coverage and gap sealing of the sealant 60, the mounting groove 11 is sealed. Moreover, there is no need to pot the circuit board surface, thus avoiding the impact of curing stress or thermal expansion and contraction on electronic components due to direct contact with the potting compound. This solves the problem of easy component damage and assembly difficulties caused by traditional waterproof fan potting and encapsulation of PCBA.

[0025] It should be noted that the above-described method of using the waterproof cover 30 and the sealant 60 together is only a preferred embodiment. In other embodiments, the waterproof cover 30 and the mounting groove 11 can also be fixed by snap-fit, threaded connection or adhesive, etc. The sealant 60 can also be made of different types of potting compounds such as epoxy resin and silicone. These modifications and improvements should be included within the scope of protection of this application.

[0026] like Figure 1 As shown, the waterproof fan in this embodiment also includes a wire 70 and a terminal head 80. The outer frame 10 is provided with a wire groove. One end of the wire 70 is electrically connected to the circuit board 20. The wire 70 is installed in the wire groove and extends out of the outer frame 10. The other end of the wire 70 is provided with a terminal head 80 for connecting an external power supply plug, thereby providing power input to the fan.

[0027] Please refer to Figure 2 , Figure 3 and Figure 8The inner bottom of the outer frame 10 has a mounting groove 11, the shape of which matches the waterproof cover 30 to ensure good sealing. The circuit board 20 is fixed in the mounting groove 11 by screws or clips. The edge of the waterproof cover 30 fits tightly against the open end of the mounting groove 11, forming the first physical barrier. The waterproof cover 30 has a through pin hole 31, through which the pins 41 of the motor 40 pass and are soldered or plugged into the circuit board 20 to achieve electrical connection. After the sealant 60 is poured, it not only covers the upper surface of the waterproof cover 30, but also fills the assembly gap between the waterproof cover 30 and the mounting groove 11, as well as the gap between the pins 41 and the pin hole 31, thereby effectively blocking the path of moisture from entering the interior of the mounting groove 11. This structure makes the space where the circuit board 20 is located a relatively sealed cavity, making it difficult for rainwater or dust in the external environment to directly corrode the electronic components. Meanwhile, since the surface of the circuit board 20 is not directly covered by potting compound, the electronic components will not be subjected to shrinkage stress during potting compound curing or fatigue damage from thermal expansion and contraction due to temperature changes, thus improving the long-term reliability of the fan.

[0028] Please refer to Figure 7 The waterproof cover 30 has a groove 32 at its upper end, and the edge of the groove 32 forms a rim 33. The outer wall of the rim 33 and the inner wall of the mounting groove 11 form an annular groove 34 with a cross-section that is wider at the top and narrower at the bottom. The sealant 60 includes a first sealing layer 61 filled inside the groove 32 and a second sealing layer 62 filled inside the annular groove 34. During the dispensing process, the liquid adhesive first flows into the groove 32 to form the first sealing layer 61, and then overflows and fills the annular groove 34 to form the second sealing layer 62. Because the annular groove 34 has a cross-section that is wider at the top and narrower at the bottom, the adhesive will adhere tightly to the groove wall due to surface tension during the curing process. The structure of being wider at the top and narrower at the bottom also has an upward force blocking the adhesive, allowing the adhesive to completely fill the space inside the annular groove 34 during dispensing, avoiding the formation of air bubbles or gaps, and resulting in a better sealing effect. At the same time, the double sealing of the first sealing layer 61 and the second sealing layer 62 further enhances the waterproof performance. Even if a very small amount of water vapor breaks through the channel 12, it will be blocked by the sealant layer and will not be able to contact the circuit board 20.

[0029] Please refer to Figure 4 The impeller 50 includes a hub 51 that is driven by the motor 40, and movable blades 52 distributed around the outer periphery of the hub 51. Figure 7 As shown, the bottom edge of the hub 51 is lower than the top edge of the waterproof cover 30, with a height difference of h. This design causes the hub 51 and the waterproof cover 30 to be radially offset, forming a channel 12. Taking airflow as an example, as... Figure 7The small arrows indicate the direction of airflow, which follows a serpentine or Z-shaped path within channel 12. The function of channel 12 is to prevent external rainwater, mud, or dust from entering the fan during operation. This tortuous path significantly increases fluid resistance, causing most particles and droplets to deposit or fail to pass through due to inertia. This prevents mud, dust, and rainwater from directly entering the rotational gap between magnet 46 and iron core 44, thus avoiding corrosion of internal components. This labyrinthine sealing structure requires no additional complex components; it is achieved solely through the relative position design between hub 51 and waterproof cover 30, resulting in a simple structure and significant waterproofing effect.

[0030] refer to Figure 8 and Figure 9 The outer frame 10 is provided with a plurality of fixed blades 13, which are distributed around the outer side of the mounting groove 11. The main function of the fixed blades 13 is to guide the airflow when the fan is running and to support the structural strength of the outer frame 10. The number of fixed blades 13 is preferably multiple, such as 7 or 9, and their shape is preferably spiral to optimize wind pressure and air volume. Of course, the number and shape of the fixed blades 13 are not limited to these. In other embodiments, the fixed blades 13 can also be designed as straight plates, arcs or other irregular shapes, and the number can also be adjusted according to the actual air duct requirements. These variations are all within the protection scope of this utility model.

[0031] refer to Figure 8 A sleeve 14 is provided in the middle of the mounting groove 11. The sleeve 14 is used to install and position the stator part of the motor 40. The sleeve 14 protrudes upward from the bottom of the mounting groove 11, and its interior forms a receiving space to mate with the copper sleeve 42 of the motor 40. The sleeve 14 provides a stable support base for the motor 40, ensuring that the motor 40 will not shift during operation.

[0032] refer to Figure 3 and Figure 6 The motor 40 also includes a copper sleeve 42, a shaft core 43, an iron core 44, a magnetic sleeve 45, a magnet 46, a bearing 47, an elastic element 48, and a retaining ring 49. The copper sleeve 42 is axially fitted onto the sleeve base 14. The shaft core 43 is rotatably disposed inside the copper sleeve 42. The iron core 44 is fitted onto the outside of the shaft core 43. A coil electrically connected to the pin 41 is wound on the shaft core 43. The magnetic sleeve 45 is fixed to the inside of the hub 51. The shaft core 43 and the magnetic sleeve 45 are fixedly connected. The magnet 46 is fixed to the inside of the magnetic sleeve 45. There is a rotational gap between the magnet 46 and the iron core 44.

[0033] The working principle of the motor 40 is as follows: When the circuit board 20 is powered on, the current flows through the pin 41 into the coil of the motor 40 (not shown in the figure). The coil is wound around the iron core 44, generating a rotating magnetic field. The magnet 46, as a permanent magnet, interacts with the rotating magnetic field to generate electromagnetic torque, driving the magnetic sleeve 45 to rotate the shaft core 43. Since the magnetic sleeve 45 is fixedly connected to the hub 51, the rotational motion of the shaft core 43 is transmitted to the hub 51 through the magnetic sleeve 45, thereby driving the movable blades 52 of the impeller 50 to rotate synchronously, realizing the air delivery function of the waterproof fan. The bearing 47 is axially sleeved on the outside of the shaft core 43, providing rotational support for the shaft core 43 and reducing friction. The elastic element 48 and the retaining ring 49 are used for axial positioning and buffering. The above motor structure adopts an external rotor design, that is, the magnet 46 and the magnetic sleeve 45 rotate together with the impeller 50, while the stator part (iron core 44, coil, etc.) is fixed. This structure is compact and has a large torque, making it suitable for use in waterproof fans.

[0034] refer to Figure 3 and Figure 6 The motor 40 also includes at least two bearings 47 axially sleeved on the outside of the shaft core 43, and the copper sleeve 42 has an inner groove for the bearings 47 to engage. Preferably, there are two bearings 47, located at each axial end of the copper sleeve 42, i.e., one bearing 47 at each axial end of the copper sleeve 42. By setting two bearings 47, the axial accuracy of the shaft core 43 is higher, the rotation is smoother, and noise and vibration caused by wear or misalignment of a single bearing 47 are reduced, thus extending the service life of the fan. The type of bearing 47 can be an oil-impregnated bearing, a ball bearing, or a hydrodynamic bearing, etc., which can be selected by those skilled in the art according to actual needs.

[0035] refer to Figure 6 An elastic element 48 is provided between the uppermost bearing 47 and the magnetic sleeve 45, and the elastic element 48 is sleeved on the outside of the shaft core 43. The function of the elastic element 48 is to provide axial buffering and preload, absorb the axial vibration generated when the motor 40 is running, and prevent damage to the bearing 47 or magnetic sleeve 45 due to thermal expansion or impact. Of course, the above is only the illustrated orientation and is not limited to the actual installation orientation. In other embodiments, the elastic element 48 can also be set in other positions, as long as the axial buffering function can be achieved. The elastic element 48 is preferably a conical spring, which can provide stable axial elastic force and occupy little space; of course, the elastic element 48 can also be a rectangular spring or a sheet, and these variations are all within the protection scope of this utility model.

[0036] refer to Figures 4 to 6The bearing 47, located at the bottom, is secured to the lower end of the shaft core 43 by a retaining ring 49. The lower end of the shaft core 43 has an annular groove 431 that mates with the retaining ring 49. After the retaining ring 49 engages with the annular groove 431, the bearing 47 is axially locked to prevent it from falling off. Of course, the orientation shown below is only for illustration and does not limit the actual installation orientation. The retaining ring 49 can also be replaced by a nut, a retaining spring, or other axial fixing components. These alternative solutions are all included within the protection scope of this utility model.

[0037] refer to Figure 4 and Figure 5 The inner bottom of the hub 51 is provided with several limiting protrusions 511, and the top surface of the magnetic sleeve 45 is provided with several limiting grooves 451 that mate with the limiting protrusions 511. During assembly, the limiting protrusions 511 are aligned with the limiting grooves 451 and inserted to achieve circumferential positioning of the hub 51 and the magnetic sleeve 45, facilitating assembly. The limiting protrusions 511 and limiting grooves 451 are arranged in a circular pattern around the axial direction, preferably eight, to ensure uniform torque transmission. Of course, the number of limiting protrusions 511 and limiting grooves 451 can also be six, ten, or other numbers, and their cross-sectional shape can also be trapezoidal, triangular, etc., as long as the limiting function can be achieved.

[0038] Please refer to Figure 3 The lower outer side of the copper sleeve 42 is provided with several circumferentially distributed and vertically extending limiting teeth 421, and the inner side of the sleeve base 14 is provided with tooth grooves that mate with the limiting teeth 421. When the copper sleeve 42 is inserted into the sleeve base 14, the limiting teeth 421 mesh with the tooth grooves to prevent relative rotation of the copper sleeve 42 during operation and avoid deflection. This design ensures the stability of the stator and improves the overall reliability of the motor 40. Of course, the number and shape of the limiting teeth 421 and tooth grooves can also be adjusted according to actual needs, such as by using spline connection or pin fixing, and these modifications are all within the protection scope of this utility model.

[0039] like Figure 3 As shown, a label 90 is also affixed to the bottom of the outer frame 10. The label 90 covers the bottom surface of the outer frame 10 and is used to seal the bottom through hole of the sleeve 14. This not only prevents external moisture or dust from entering the mounting groove 11 through the through hole, but also serves to identify product information.

[0040] In summary, the waterproof fan with a waterproof cover and potting compound structure of this application achieves triple waterproof protection through the specific structural design of channel 12, waterproof cover 30, sealant 60 and motor 40, and can reach the IP86 waterproof rating. It effectively solves the problems of water ingress into the fan and damage to electronic components in harsh outdoor environments. At the same time, it is easy to assemble, low in cost, and has high practical value.

[0041] The embodiments described above are merely illustrative of one or more specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A waterproof fan with a waterproof cap and potting compound structure, characterized in that, include: The outer frame (10) has a mounting groove (11) on the inner bottom; Circuit board (20) is fixed in the mounting slot (11); A waterproof cover (30) is fixed to the open end of the mounting groove (11) to close the mounting groove (11). The waterproof cover (30) is provided with a through pin hole (31). The motor (40) includes pins (41), the lower end of which passes through the pin hole (31) and is electrically connected to the circuit board (20); The impeller (50) includes a hub (51) that is connected to the motor (40) for transmission, and movable blades (52) distributed on the outer periphery of the hub (51). The bottom edge of the hub (51) is lower than the top edge of the waterproof cover (30). The hub (51) and the waterproof cover (30) are radially offset to form a channel (12). Sealant (60) is applied to the upper end of the waterproof cover (30) and fills the gap between the waterproof cover (30) and the mounting groove (11) and the gap between the pin (41) and the pin hole (31).

2. The waterproof fan according to claim 1, characterized in that: The upper end of the waterproof cover (30) is provided with a groove (32), the edge of the groove (32) forms a rim (33), and the outer wall of the rim (33) and the inner wall of the mounting groove (11) form an annular groove (34) with a cross-section that is larger at the top and smaller at the bottom. The sealant (60) includes a first sealing layer (61) filled inside the groove (32) and a second sealing layer (62) filled inside the annular groove (34).

3. The waterproof fan according to claim 1, characterized in that: The outer frame (10) is provided with a plurality of fixed blades (13), which are distributed around the outside of the mounting groove (11).

4. The waterproof fan according to claim 1, characterized in that: A sleeve (14) is provided in the middle of the mounting groove (11); The motor (40) also includes: A copper sleeve (42) is axially fitted onto the sleeve base (14); The shaft (43) is rotatably disposed within the copper sleeve (42); An iron core (44) is sleeved on the outside of the shaft core (43), and a coil electrically connected to the pin (41) is wound on the shaft core (43); A magnetic sleeve (45) is fixed to the inner side of the hub (51), and the shaft core (43) is fixedly connected to the magnetic sleeve (45); A magnet (46) is fixed inside the magnetic sleeve (45), and there is a rotational gap between the magnet (46) and the iron core (44).

5. The waterproof fan according to claim 4, characterized in that: The motor (40) also includes at least two bearings (47) axially sleeved on the outside of the shaft core (43), and the copper sleeve (42) is provided with an inner groove for the bearings (47) to be inserted.

6. The waterproof fan according to claim 5, characterized in that: An elastic element (48) is provided between the uppermost bearing (47) and the magnetic sleeve (45), and the elastic element (48) is sleeved on the outside of the shaft core (43).

7. The waterproof fan according to claim 6, characterized in that: The elastic element (48) is a conical spring, a rectangular spring, or a spring sheet.

8. The waterproof fan according to claim 5, characterized in that: The bearing (47) located at the bottom is limited to the lower end of the shaft core (43) by a retaining ring (49), and the lower end of the shaft core (43) is provided with an annular groove (431) that cooperates with the retaining ring (49).

9. The waterproof fan according to claim 4, characterized in that: The inner bottom of the hub (51) is provided with several limiting protrusions (511), and the top surface of the magnetic sleeve (45) is provided with several limiting grooves (451) that cooperate with the limiting protrusions (511).

10. The waterproof fan according to claim 4, characterized in that: The lower outer side of the copper sleeve (42) is provided with a number of circumferentially distributed and vertically extended limiting teeth (421), and the inner side of the sleeve base (14) is provided with tooth grooves that cooperate with the limiting teeth (421).

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