Fan with improved electromagnetic compatibility

Abstract

The utility model discloses a fan with improved electromagnetic compatibility, which comprises a conductive connecting piece, a fan shell, a control circuit board, a motor stator, a magnetic ring and fan blades, an accommodating space is arranged in the fan shell, the control circuit board is arranged in the accommodating space, and the control circuit board is electrically connected with the motor stator through the conductive connecting piece. The magnetic ring is movably arranged on the periphery of the motor stator; the fan blades are fixedly connected with the magnetic ring, and the fan blades cover the upper portion of the control circuit board. The control circuit board is connected with the motor stator through the conductive connecting piece, the control circuit board is grounded, and the fan blades cover the control circuit board, so that electromagnetic protection of the control circuit board in the accommodating space is realized, and magnetic interference of the control circuit board to the outside is blocked; the EMC environment of the direct-current brushless fan structure is improved, and meanwhile, the motor stator of the fan is matched with the control circuit board, so that the cost is greatly reduced, and the direct-current brushless fan is easy to produce and process.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a fan with improved electromagnetic compatibility. Background Technology

[0002] Electromagnetic compatibility (EMC) refers to the ability of a device or system to operate within its electromagnetic environment without causing intolerable electromagnetic interference to any other device in that environment. Therefore, EMC requirements include two aspects: firstly, the electromagnetic interference generated by the device during normal operation must not exceed certain limits; secondly, the device must have a certain degree of immunity to electromagnetic interference present in its environment.

[0003] Existing brushless DC fans mainly use a mechanism where the coil is directly fixed to the circuit board, without any electromagnetic protection for the circuit board. This makes the circuit board easily susceptible to external electromagnetic interference, and the fan itself is also prone to electromagnetic interference to the outside world. Therefore, the electromagnetic compatibility of the fan needs to be considered separately.

[0004] Chinese patent publication number CN208870810U discloses a structure for improving the EMC environment of a DC brushless fan. It improves electromagnetic compatibility by adding a shielding cover mechanism in the accommodating space where the control circuit is located. However, the introduction of the shielding cover results in relatively high cost and makes it difficult to manufacture. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a fan with improved electromagnetic compatibility.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a fan with improved electromagnetic compatibility, including a conductive connector, a fan housing, a control circuit board, a motor stator, a magnetic coil, and fan blades. The fan housing has an accommodating space, and the control circuit board is disposed in the accommodating space. The control circuit board is electrically connected to the motor stator through the conductive connector, and the magnetic coil is movably disposed around the periphery of the motor stator. The fan blades are fixedly connected to the magnetic coil and cover the control circuit board.

[0008] Furthermore, the conductive connector includes a first connecting portion and a second connecting portion, the first connecting portion being connected to the negative terminal of the control circuit board, and the second connecting portion being connected to the motor stator.

[0009] Furthermore, it also includes a connecting post that extends from the bottom to the top of the fan housing, and the motor stator is sleeved on the connecting post.

[0010] Furthermore, the second connecting part has a ring-shaped structure, is sleeved on the connecting post, and is located below the motor stator. After the motor stator is installed in place, the second connecting part contacts the motor stator.

[0011] Furthermore, the fan housing includes an upper shell and a lower shell connected vertically, and a sleeve portion extends upward from the inner side of the lower shell, with the lower end of the connecting post sleeved in the sleeve portion.

[0012] Furthermore, the control circuit board is fixedly connected to the inner side of the lower housing, and the control circuit board is provided with a clearance hole that allows the sleeve portion to pass through.

[0013] Furthermore, it also includes a fixed housing, which is fixedly connected to the periphery of the magnetic ring, and the fan blade is fixedly connected to the fixed housing.

[0014] Furthermore, the fixing shell includes a top plate portion and an annular side plate portion extending downward along the periphery of the top plate portion. The annular side plate portion is disposed around the magnetic ring, and the top plate portion is located at the top of the magnetic ring.

[0015] Furthermore, the fan blade is provided with a mounting groove that conforms to the outer contour of the fixed shell, and the fan blade is fixed to the outer surface of the fixed shell through the mounting groove.

[0016] Furthermore, the fan housing has an air inlet near the fan blades, and an air outlet is provided on the side of the fan housing. Both the air inlet and the air outlet communicate with the accommodating space.

[0017] The advantages of this invention compared to existing technologies are as follows: A fan with improved electromagnetic compatibility includes a conductive connector, a fan housing, a control circuit board, a motor stator, a magnetic coil, and fan blades. The fan housing has an internal receiving space, within which the control circuit board is located. The control circuit board is electrically connected to the motor stator via the conductive connector. The magnetic coil is movably positioned around the motor stator. The fan blades are fixedly connected to the magnetic coil and cover the control circuit board. This invention connects the control circuit board to the motor stator within the fan itself via the conductive connector, grounding the control circuit board during operation. Simultaneously, the fan blades covering the control circuit board provide electromagnetic protection, preventing external magnetic interference to the control circuit board and also blocking the control circuit board from transmitting magnetic interference to the outside world, thus improving the EMC environment of the DC brushless fan structure. Furthermore, since the fan utilizes the existing motor stator and control circuit board, no additional shielding cover is needed, significantly reducing costs and facilitating manufacturing.

[0018] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objectives, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a fan for improving electromagnetic compatibility is provided for a specific embodiment of this utility model;

[0021] Figure 2 An analysis of a portion of the structure of a fan for improving electromagnetic compatibility, provided in a specific embodiment of this utility model. Figure 1 ;

[0022] Figure 3 An analysis of a portion of the structure of a fan for improving electromagnetic compatibility, provided in a specific embodiment of this utility model. Figure 2 ;

[0023] Figure 4 A cross-sectional view of a fan for improving electromagnetic compatibility provided in a specific embodiment of this utility model;

[0024] Figure 5 A schematic diagram of the structure of a fan blade in a fan designed to improve electromagnetic compatibility is provided for a specific embodiment of this utility model.

[0025] Figure 6 This is a schematic diagram of the structure of a fixed shell in a fan for improving electromagnetic compatibility, provided as a specific embodiment of the present invention.

[0026] Figure Labels

[0027] 1. Fan housing; 11. Air inlet; 12. Air outlet; 13. Upper cover; 14. Lower cover; 141. Sleeve section; 15. Accommodation space; 2. Fan blade; 21. Mounting slot; 3. Fixing shell; 31. Top plate section; 32. Annular side plate section; 4. Magnetic ring; 5. Motor stator; 6. Connecting post; 7. Control circuit board; 71. Clearance hole; 8. Conductive connector; 81. First connecting part; 82. Second connecting part. Detailed Implementation

[0028] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0034] like Figures 1 to 6 As shown, this utility model embodiment provides a fan with improved electromagnetic compatibility, including a conductive connector 8, a fan housing 1, a control circuit board 7, a motor stator 5, a magnetic coil 4, and fan blades 2. The fan housing 1 has a receiving space 15, and the control circuit board 7 is disposed in the receiving space 15. The control circuit board 7 is electrically connected to the motor stator 5 through the conductive connector 8. The magnetic coil 4 is movably disposed on the periphery of the motor stator 5. The fan blades 2 are fixedly connected to the magnetic coil 4, and the fan blades 2 cover the control circuit board 7.

[0035] The fan housing 1, serving as the external carrier of the entire device, is made of insulating materials, such as engineering plastics. Its interior is designed with a specific accommodating space 15, providing a location for the installation of other components. The shape and size of this accommodating space 15 can be customized according to actual design requirements to accommodate components such as control circuit boards 7 and motor stators 5 of different specifications.

[0036] The control circuit board 7 is the core of the fan operation control, integrating various electronic components to control parameters such as fan speed and direction. It should be noted that the control circuit board 7 is prior art, and this application does not improve upon it; therefore, its working principle will not be described in detail here.

[0037] The motor stator 5 operates based on electromagnetic induction. A magnetic coil 4 is movably positioned around the motor stator 5. When the motor stator 5 is energized and generates a magnetic field, the magnetic coil 4 rotates around the motor stator 5 under the influence of the magnetic field. The gap between the magnetic coil 4 and the motor stator 5 needs to be optimized according to the specific performance requirements of the fan to ensure the effectiveness of the magnetic field.

[0038] The control circuit board 7 is electrically connected to the motor stator 5 via conductive connector 8, allowing the control circuit board 7 to be grounded through the motor stator 5. This effectively reduces electromagnetic interference on the control circuit board 7 and improves the stability and reliability of fan operation. The fan blades 2 cover the control circuit board 7, preventing interference from external magnetic fields and blocking the propagation of electromagnetic interference generated by the control circuit board 7, significantly improving the electromagnetic compatibility (EMC) environment of the fan structure. Furthermore, this design fully utilizes existing fan components, eliminating the need for additional shielding covers or other complex structures, greatly reducing production costs, simplifying the manufacturing process, and improving production efficiency.

[0039] In one embodiment, such as Figure 3 As shown, the conductive connector 8 includes a first connecting part 81 and a second connecting part 82. The first connecting part 81 is connected to the negative terminal of the control circuit board 7, and the second connecting part 82 is connected to the motor stator 5.

[0040] The conductive connector 8 is a key component for constructing the electrical connection between the control circuit board 7 and the motor stator 5. Its design and implementation play a core role in improving the electromagnetic compatibility of the fan.

[0041] In actual production, soldering is a common method for connecting the first connection part 81 to the negative terminal of the control circuit board 7. For example, in the manufacturing process of cooling fans for electronic devices, the control circuit board 7 often uses a printed circuit board (PCB). For this type of circuit board, its negative terminal is usually presented through specific solder pads. During operation, the solder pads are first cleaned to remove the oxide layer and impurities on the surface, ensuring good soldering conditions. Then, flux is evenly applied to the metal leads of the solder pads and the first connection part 81. The flux can reduce the surface tension of the solder and promote better wetting of the metal surface. Next, the solder (such as common tin-lead alloy solder) is heated with a soldering iron to melt it and flow between the leads and the solder pads. After cooling, a strong metallurgical bond is formed. This soldering connection method can provide extremely low contact resistance, ensuring smooth current transmission between the negative terminal of the control circuit board 7 and the first connection part 81, effectively reducing signal interference or electrical faults caused by poor contact, and greatly improving the stability of the circuit connection.

[0042] In some embodiments, the first connection portion 81 is crimped to the negative terminal of the control circuit board 7. For example, crimp terminals are pre-installed in the negative terminal area of ​​the control circuit board 7. These terminals are made of a highly conductive and mechanically sound metal material, such as brass. The first connection portion 81 is equipped with a matching crimp connector, the shape and size of which are designed as needed to ensure a tight fit with the crimp terminals. During installation, a dedicated crimping tool (such as a hydraulic crimping machine) is used to apply sufficient pressure to the crimp connector, ensuring a tight engagement with the crimp terminals and forming a reliable electrical connection. The crimp connection not only ensures good conductivity but also possesses strong mechanical strength, capable of withstanding the vibrations and impacts generated by the fan during operation, effectively preventing electrical problems caused by loose connections.

[0043] Through the connection method designed above, the conductive connector 8 successfully establishes a stable electrical path between the control circuit board 7 and the motor stator 5. This allows the control circuit board 7 to be grounded via the motor stator 5, effectively reducing the electromagnetic interference generated by the control circuit board 7 itself. During operation, after the fan is powered on, the electromagnetic interference signal on the control circuit board 7 is conducted to the motor stator 5 through the conductive connector 8 and then introduced to the ground. This greatly reduces the electromagnetic radiation interference of the control circuit board 7 to other electronic components inside the fan and surrounding electronic equipment, significantly improves the electromagnetic compatibility environment of the entire fan system, enhances the stability and reliability of fan operation, and ensures the normal operation of electronic equipment.

[0044] In one embodiment, such as Figure 3 , Figure 4 As shown, a fan with improved electromagnetic compatibility also includes a connecting post 6, which extends from the bottom to the top of the fan housing 1, and the motor stator 5 is sleeved on the connecting post 6.

[0045] The connecting post 6 provides a stable mounting support for the motor stator 5. The connecting post 6 can be hollow or solid; a hollow one is beneficial for cable routing. During installation, the size of the center hole of the motor stator 5 must match the outer diameter of the connecting post 6, allowing the motor stator 5 to fit snugly onto the connecting post 6. Taking the motor stator 5 of a common DC brushless fan as an example, its stator core, made of stacked silicon steel sheets, has a smooth circular hole pre-drilled in the center. The surface of the connecting post 6 is finely machined, resulting in a high degree of smoothness. When the motor stator 5 is fitted into the connecting post 6, a tight fit is formed between the two, preventing excessive looseness that could cause the motor stator 5 to wobble during operation, affecting the fan's performance and stability, while also avoiding excessive tightness that would make installation difficult. To further ensure the accuracy and stability of the installation, some positioning grooves can be set on the surface of the connecting column 6, and corresponding positioning protrusions can be set on the inner wall of the motor stator 5. When the motor stator 5 is fitted into the connecting column 6, the positioning protrusions will be engaged in the positioning grooves, thereby precisely defining the installation position of the motor stator 5 and preventing it from rotating circumferentially on the connecting column 6.

[0046] The connecting post 6 provides a stable mounting base for the motor stator 5, ensuring the positional stability of the motor stator 5 during fan operation. Furthermore, the upward extension of the connecting post 6 from the bottom of the fan housing 1 makes the overall fan layout more compact and rational, optimizing internal space utilization and facilitating the installation and layout of other components such as the control circuit board 7, thus improving the overall integration of the fan system.

[0047] In one embodiment, such as Figure 3 As shown, the second connecting part 82 has a ring-shaped structure. The second connecting part 82 is sleeved on the connecting post 6 and is located below the motor stator 5. After the motor stator 5 is installed in place, the second connecting part 82 contacts the motor stator 5.

[0048] The second connecting part 82 is made of a metal material with a certain degree of elasticity, such as beryllium bronze, and can be made into a ring with an inner diameter slightly smaller than the outer diameter of the connecting post 6. During installation, the second connecting part 82 is first fitted onto the connecting post 6. Due to its elasticity, it will tightly grip the surface of the connecting post 6. When the motor stator 5 is fitted onto the connecting post 6, the motor stator 5 and the second connecting part 82 are pressed together to achieve close contact, thereby establishing an electrical connection. By cleverly utilizing the structure of the connecting post 6, not only is electrical conduction achieved, but it also provides a certain degree of buffering for the motor stator 5.

[0049] In one embodiment, such as Figure 3 As shown, the fan housing 1 includes an upper housing 13 and a lower housing 14 connected vertically. The inner side of the lower housing 14 extends upward to provide a sleeve portion 141, and the lower end of the connecting post 6 is sleeved in the sleeve portion 141.

[0050] The fan housing 1 consists of an upper housing 13 and a lower housing 14 connected vertically. This split design facilitates the installation and maintenance of internal components.

[0051] The upper cover 13 and the lower cover 14 can be connected by snap-fit ​​or screws. Taking snap-fit ​​as an example, several snap-fit ​​protrusions are evenly distributed on the inner edge of the upper cover 13, and corresponding snap-fit ​​grooves are provided on the lower cover 14. During assembly, simply align the upper cover 13 with the lower cover 14 and press gently; the snap-fit ​​protrusions will then engage with the snap-fit ​​grooves, achieving a tight connection. This connection method is simple to operate, allows for quick assembly of the outer shell, and improves production efficiency.

[0052] A sleeve portion 141 extends upward from the inner side of the lower housing 14. The sleeve portion 141 is designed to mate with the connecting post 6 to achieve stable installation of the connecting post 6. The sleeve portion 141 is made of the same material as the lower housing 14 and is integrally molded by injection molding to ensure the connection strength between it and the lower housing 14. The inner diameter of the sleeve portion 141 is slightly larger than the outer diameter of the lower end of the connecting post 6 to ensure that the connecting post 6 can be smoothly fitted.

[0053] The lower end of the connecting post 6 is fitted into the sleeve portion 141. During installation, the lower end of the connecting post 6 is first aligned with the sleeve portion 141, and then slowly inserted. To ensure the verticality and stability of the connecting post 6, guide grooves can be provided on the inner wall of the sleeve portion 141, and corresponding guide protrusions can be provided on the lower end of the connecting post 6. When the connecting post 6 is inserted into the sleeve portion 141, the guide protrusions will slide along the guide grooves, guiding the connecting post 6 to be accurately inserted and preventing the connecting post 6 from shifting during insertion. At the same time, this structure can also increase the friction between the connecting post 6 and the sleeve portion 141, further improving the stability of the connection.

[0054] The split design of the fan housing 1 makes the installation and replacement of internal components more convenient. For example, when it is necessary to repair the control circuit board 7 or the motor stator 5 inside the fan, simply remove the upper housing 13 from the lower housing 14 to access the internal components. The sleeve portion 141 on the inner side of the lower housing 14 and the sleeve structure with the connecting post 6 provide stable support for the connecting post 6, thereby ensuring the positional stability of components such as the motor stator 5 mounted on the connecting post 6. This is crucial for the normal operation of the fan, because stable component positions ensure that the relative positional relationship between the various components remains within the design range during fan operation, thus guaranteeing the fan's performance and stability.

[0055] In one embodiment, a threaded connection can be used as an alternative to connect the connecting post 6 to the lower housing 14. An internal thread is machined into the inner wall of the sleeve portion 141 of the lower housing 14, and a matching external thread is machined into the lower end of the connecting post 6. During installation, the lower end of the connecting post 6 is screwed into the sleeve portion 141, and the connection is achieved through the tight fit of the threads. The advantage of this connection method is its high connection strength, and the ability to disassemble and reinstall the connecting post 6 as needed, facilitating the adjustment and maintenance of the internal components of the fan. This is particularly suitable for industrial fan applications where frequent replacement of internal components is required.

[0056] In one embodiment, such as Figure 3 As shown, the control circuit board 7 is fixedly connected to the inner side of the lower housing 14, and the control circuit board 7 is provided with a clearance hole 71 that allows the sleeve part 141 to pass through.

[0057] The fixing method of the control circuit board 7 to the inside of the lower housing 14 and the setting of the clearance hole 71 ensure the rationality and functionality of the internal layout of the fan. The control circuit board 7 can be fixed to the inside of the lower housing 14 with screws. Specifically, several column structures with threaded holes are pre-set on the inside of the lower housing 14 corresponding to the installation position of the control circuit board 7. These column structures are integrally injection molded with the lower housing 14 to ensure sufficient strength. Screw holes are opened at corresponding positions on the control circuit board 7. When the control circuit board 7 is placed inside the lower housing 14, screws are passed through the screw holes of the control circuit board 7 and screwed into the threaded holes of the columns inside the lower housing 14. By tightening the screws, the control circuit board 7 is firmly fixed to the inside of the lower housing 14.

[0058] Of course, in some embodiments, the control circuit board 7 and the inner side of the lower housing 14 can also be connected by a snap-fit ​​mechanism. That is, a snap-fit ​​structure adapted to the shape of the control circuit board 7 is provided on the inner side of the lower housing 14. These snap-fit ​​structures can be elastic plastic protrusions or grooves. The edges of the control circuit board 7 are designed to fit tightly with the snap-fit ​​structure. During installation, align the control circuit board 7 with the snap-fit ​​structure on the inner side of the lower housing 14 and press gently. The edge of the control circuit board 7 will snap into the snap-fit ​​structure, achieving a fixed connection. This method does not require additional screws or other connectors, making installation simpler and faster, and suitable for production scenarios with high assembly efficiency requirements.

[0059] The control circuit board 7 is provided with a clearance hole 71 that allows the sleeve portion 141 to pass through. The shape and size of the clearance hole 71 are precisely designed according to the outer shape of the sleeve portion 141. Generally, the clearance hole 71 is circular, and its diameter is slightly larger than the outer diameter of the sleeve portion 141.

[0060] The fixed connection between the control circuit board 7 and the inner side of the lower housing 14 ensures a stable mounting position for the control circuit board 7 inside the fan, guaranteeing its stability during fan operation and preventing problems such as poor electrical connections due to displacement. Simultaneously, the clever design of the clearance hole 71 resolves the conflict between the control circuit board 7 and the sleeve portion 141, resulting in a more compact and rational internal structure layout for the fan, ensuring that all components can work collaboratively within a limited space. This design enhances the overall integration and reliability of the fan, guaranteeing stable and efficient operation.

[0061] In one embodiment, such as Figure 3 , Figure 4 , Figure 6 As shown, a fan for improving electromagnetic compatibility also includes a fixed housing 3, which is fixedly connected to the periphery of the magnetic ring 4, and the fan blade 2 is fixedly connected to the fixed housing 3.

[0062] The fixing shell 3 is fixedly connected to the outer periphery of the magnetic ring 4. The fixing method can be adhesive bonding or snap-fit ​​connection. When using adhesive bonding, choose an adhesive with good adhesion and weather resistance, such as epoxy adhesive. Apply adhesive evenly to the outer surface of the magnetic ring 4, then accurately place the fixing shell 3 around the magnetic ring 4, press gently and hold for a period of time. After the adhesive cures, the fixing shell 3 and the magnetic ring 4 will be firmly connected. When using snap-fit ​​connection, several snap-fit ​​protrusions are provided on the outer surface of the magnetic ring 4, and corresponding snap-fit ​​grooves are provided on the inner surface of the fixing shell 3. When the fixing shell 3 is placed around the magnetic ring 4, the snap-fit ​​protrusions will engage with the snap-fit ​​grooves, achieving a quick and stable connection. This method is simple to operate and facilitates rapid assembly on the production line.

[0063] The fixed housing 3 tightly connects the magnetic ring 4 and the fan blade 2 into a single unit, enabling the magnetic ring 4 to efficiently drive the fan blade 2 to rotate synchronously under the magnetic field generated by the motor stator 5, thus achieving normal fan operation. This structural design enhances the stability of the connection between the fan blade 2 and the magnetic ring 4, ensuring the reliability of the fan during operation and avoiding safety hazards such as the fan blade 2 falling off due to a loose connection.

[0064] In one embodiment, such as Figure 6 As shown, the fixed housing 3 includes a top plate portion 31 and an annular side plate portion 32 extending downward along the periphery of the top plate portion 31. The annular side plate portion 32 is located around the magnetic ring 4, and the top plate portion 31 is located on top of the magnetic ring 4. This design provides all-around limiting and support for the magnetic ring 4. The annular side plate portion 32 restricts the displacement of the magnetic ring 4 in the radial direction, while the top plate portion 31 ensures the positional stability of the magnetic ring 4 in the axial direction. This allows the magnetic ring 4 to rotate stably under the action of the alternating magnetic field generated by the motor stator 5, thereby driving the connected fan blade 2 to operate efficiently.

[0065] The connection structure between the fixed housing 3 and the magnetic coil 4 helps reduce vibration and noise during fan operation. Because the magnetic coil 4 will not wobble due to insecure fixing during rotation, it reduces noise caused by component collisions and friction, while also improving fan operating efficiency and lifespan.

[0066] In one embodiment, such as Figure 5 As shown, the fan blade 2 is provided with a mounting groove 21 that is adapted to the outer contour of the fixed shell 3, and the fan blade 2 is fixed to the outer surface of the fixed shell 3 through the mounting groove 21.

[0067] When assembling the fan, the operator aligns the mounting slot 21 of the fan blade 2 with the outer surface of the mounting housing 3, and then slowly slides the fan blade 2 onto the outer surface of the mounting housing 3. Due to the interference fit between the mounting slot 21 and the mounting housing 3, a certain amount of external force is required to complete the fitting. During this process, the inner surface of the mounting slot 21 will generate a certain amount of friction with the outer surface of the mounting housing 3. This friction helps to maintain the relative position stability of the fan blade 2 and the mounting housing 3.

[0068] The tight fit between the mounting slot 21 and the fixed housing 3 effectively prevents the fan blades 2 from shifting or falling off during operation. When the fan rotates at high speed, the fan blades 2 are subjected to significant centrifugal force, and the tight fitting structure provides sufficient friction and restraint to resist the centrifugal force, ensuring the stable operation of the fan blades 2. From a fan performance perspective, a stable connection helps reduce vibration and noise during fan operation. Because the connection between the fan blades 2 and the fixed housing 3 is firm, no additional vibration will occur due to loosening, thereby reducing the noise level during fan operation and improving the fan's working efficiency.

[0069] In one embodiment, the mounting groove 21 and the fixing shell 3 can be fixed with screws instead of a sleeve. Screw holes are provided on the top plate 31 and the annular side plate 32 of the fixing shell 3 at positions corresponding to the fan blade 2, and through holes are also provided on the fan blade 2 accordingly. During installation, the fan blade 2 is placed on the outer surface of the fixing shell 3, aligning the through holes on the fan blade 2 with the screw holes on the fixing shell 3. Then, screws are passed through the through holes and screwed into the screw holes, and the screws are tightened to fix the fan blade 2 to the fixing shell 3.

[0070] In one embodiment, the mounting groove 21 and the fixing shell 3 can be bonded together with adhesive.

[0071] In one embodiment, such as Figure 1 As shown, the fan housing 1 has several air inlets 11 near the fan blades 2. The air inlets 11 have a honeycomb structure. The side of the fan housing has two air outlets 12. Both the air inlets 11 and the air outlets 12 are connected to the accommodating space 15.

[0072] The shape of the air outlet 12 can be circular, square, or oval, etc. The choice of shape mainly depends on the design requirements of the fan and the limitations of the installation space. The designed air inlet 11 and air outlet 12 can ensure that sufficient airflow enters the fan housing space 15 to remove the heat generated by the internal components of the fan (such as the control circuit board 7, motor stator 5, etc.), thereby ensuring the normal operating temperature of the fan and related equipment.

[0073] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A fan for improving electromagnetic compatibility, characterized by, The application relates to a fan, which comprises a conductive connecting piece, a fan shell, a control circuit board, a motor stator, a magnetic ring and a fan blade.

2. The fan for improving electromagnetic compatibility according to claim 1, wherein The conductive connecting piece comprises a first connecting part and a second connecting part.

3. The fan of claim 2, wherein, The application further comprises a connecting column, which extends from the bottom to the top of the fan shell.

4. The fan of claim 3, wherein, The second connecting part is in the form of a ring structure, is sleeved on the connecting column and is located below the motor stator.

5. The fan of claim 3, wherein the fan further comprises a fan housing having a plurality of openings formed therein, the plurality of openings being configured to allow the fan to emit electromagnetic radiation. The fan shell comprises an upper shell cover and a lower shell cover which are connected in sequence.

6. The fan of claim 5, wherein, The control circuit board is fixedly connected to the inner side of the lower shell cover and is provided with an avoiding hole through which the sleeve part passes.

7. A fan for improved electromagnetic compatibility according to any one of claims 1-6, characterized in that, The application further comprises a fixing shell which is fixedly connected to the periphery of the magnetic ring and is fixedly connected to the fan blade.

8. The fan of claim 7, wherein, The fixing shell comprises a top plate part and an annular side plate part which extends downward along the periphery of the top plate part.

9. The fan of claim 8, wherein, The fan blade is provided with a mounting groove which is adapted to the contour of the fixing shell.

10. The fan of claim 1, wherein: The fan shell is provided with an air inlet near the fan blade and is provided with an air outlet on the side surface. The air inlet and the air outlet are communicated with the accommodating space.

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