Plastic magnet rotor for fan motor

Abstract

The utility model belongs to the field of plastic magnetic rotor, especially relate to a plastic magnetic rotor for fan motor. The utility model provides a plastic magnetic rotor for fan motor, include: plastic magnetic ring, the middle part of plastic magnetic ring is opened with connecting hole along the axial direction, the inside of plastic magnetic ring is equipped with spiral channel along its axial direction, and spiral channel is set up along the axial direction of plastic magnetic ring, the shaft core is embedded in the connecting hole, the outer circumferential surface of the shaft core and the inner wall of the connecting hole are provided with the limit component, through setting up the spiral channel of penetration in the plastic magnetic ring, the active heat dissipation is realized, and the limit component is matched with the connection firmness of the shaft core and plastic magnetic ring, and the heat dissipation area is increased, the low passive heat dissipation efficiency and the volume, energy consumption and stability problem brought by the additional heat dissipation component are solved.

Description

Technical Field

[0001] This utility model belongs to the field of plastic magnetic rotors, and particularly relates to a plastic magnetic rotor for fan motors. Background Technology

[0002] A plastic magnetic rotor is a motor rotor component made by combining permanent magnet materials with plastic through injection molding. Its core is the uniform distribution of permanent magnet powder (such as ferrite, neodymium iron boron, etc.) within a plastic matrix. After injection molding, a rotor with a specific magnetic circuit structure and shape is formed. In the field of fan motors, plastic magnetic rotors are widely used due to their lightweight structure and stable magnetic properties. However, during high-speed operation, the rotor and the inside of the motor are prone to generating a large amount of heat due to electromagnetic losses and mechanical friction. If heat dissipation is not timely, it will lead to a decrease in motor efficiency and a shortened service life.

[0003] Existing plastic magnetic rotors rely mainly on passive cooling or additional cooling fans for heat dissipation. Passive cooling has limited efficiency and is difficult to meet the heat dissipation requirements of high-power motors. Adding additional cooling components will increase the overall size and energy consumption of the motor, and may affect operational stability due to structural complexity. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned technical problems by providing a plastic magnetic rotor for a fan motor. It achieves active heat dissipation by setting a through spiral channel inside the plastic magnetic ring. Combined with a limiting component, it not only improves the connection between the shaft and the plastic magnetic ring but also increases the heat dissipation area, thus solving the problems of low efficiency of passive heat dissipation and the volume, energy consumption, and stability issues caused by additional heat dissipation components.

[0005] In view of this, the present invention provides a plastic magnetic rotor for a fan motor, comprising: A plastic magnetic ring, wherein a connecting hole is provided through the middle of the plastic magnetic ring along the axial direction, and a spiral channel is provided inside the plastic magnetic ring along its axial direction, and the spiral channel is provided through the plastic magnetic ring along the axial direction. A shaft core is embedded in the connecting hole. A limiting component is provided between the outer peripheral surface of the shaft core and the inner wall of the connecting hole. The limiting component is used to restrict the relative movement of the shaft core and the plastic magnetic ring to improve the firmness of the connection between the two. At the same time, the limiting component can increase the heat dissipation area between the shaft core and the plastic magnetic ring to improve the heat dissipation effect.

[0006] In this technical solution, active heat dissipation is achieved by setting a through spiral channel inside the plastic magnetic ring. Combined with the limiting component, it not only improves the connection between the shaft core and the plastic magnetic ring, but also increases the heat dissipation area, thus solving the problems of low efficiency of passive heat dissipation and the volume, energy consumption and stability caused by additional heat dissipation components.

[0007] Furthermore, the shaft core has a hollow structure, and the inner cavity of the shaft core is filled with highly thermally conductive silicone.

[0008] In this technical solution, the heat conduction capacity of the shaft core can be enhanced by filling the hollow shaft core with high thermal conductivity silicone, thereby improving the overall heat dissipation effect.

[0009] Furthermore, the inner wall of the shaft core is fixedly connected with multiple reinforcing rings, and the multiple reinforcing rings are equidistantly distributed in the inner cavity of the shaft core.

[0010] In this technical solution, multiple reinforcing rings on the inner wall of the shaft core can enhance the structural strength of the shaft core and ensure its stability during high-speed rotation.

[0011] Furthermore, the limiting component includes: Multiple rectangular blocks are fixedly connected to the outer peripheral wall of the shaft core, and the multiple rectangular blocks are distributed in a circular pattern at equal intervals on the outer peripheral wall of the shaft core; Multiple rectangular grooves are formed on the inner wall of the connecting hole, and the multiple rectangular grooves are distributed in a circular pattern at equal intervals on the inner wall of the connecting hole.

[0012] In this technical solution, the limiting component composed of rectangular blocks and rectangular grooves can effectively limit the relative movement between the shaft core and the plastic magnetic ring, enhancing the connection firmness while increasing the heat dissipation contact area.

[0013] Furthermore, the number of rectangular slots is the same as the number of rectangular blocks, and the positions of the rectangular slots correspond to the positions of the rectangular blocks and are adapted in size.

[0014] In this technical solution, the number, position, and size of the rectangular slots and rectangular blocks are matched to ensure precise matching of the limiting components, thereby further improving connection reliability and heat dissipation.

[0015] Furthermore, the rectangular blocks are integrally formed with the shaft core.

[0016] In this technical solution, the block and the shaft are integrally formed, which can improve the connection strength between the limiting component and the shaft, ensure structural stability, and facilitate processing.

[0017] The beneficial effects of this utility model are: This invention achieves active heat dissipation by setting a through spiral channel inside the plastic magnetic ring. Combined with the limiting component, it not only improves the connection between the shaft core and the plastic magnetic ring, but also increases the heat dissipation area, thus solving the problems of low efficiency of passive heat dissipation and the volume, energy consumption and stability caused by additional heat dissipation components. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the plastic magnetic ring structure of this utility model; Figure 3This is a schematic diagram of the connection structure between the shaft core and the rectangular block of this utility model; Figure 4 This is a schematic diagram of the overall cross-sectional structure of this utility model.

[0019] In the diagram: 1. Plastic magnetic ring; 11. Spiral channel; 12. Connecting hole; 13. Rectangular groove; 2. Shaft core; 21. Rectangular block; 22. Reinforcing ring. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0021] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0022] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0023] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" 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. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0024] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0025] Example 1: like Figure 1 — Figure 4 As shown, this utility model provides a plastic magnetic rotor for a fan motor, comprising: a plastic magnetic ring 1, wherein a connecting hole 12 is axially penetrated through the middle of the plastic magnetic ring 1, and a spiral channel 11 is provided axially inside the plastic magnetic ring 1, and the spiral channel 11 is axially penetrated through the plastic magnetic ring 1; and a shaft core 2, which is embedded in the connecting hole 12. A limiting component is provided between the outer peripheral surface of the shaft core 2 and the inner wall of the connecting hole 12. The limiting component is used to limit the relative movement between the shaft core 2 and the plastic magnetic ring 1 to improve the firmness of the connection between the two. At the same time, the limiting component can increase the heat dissipation area between the shaft core 2 and the plastic magnetic ring 1 to improve the heat dissipation effect.

[0026] During operation, when the rotor rotates at high speed, centrifugal force can drive air to be drawn in from the central area of ​​the shaft core 2 and flow along the spiral channel. The channel structure accelerates the airflow, achieving active heat dissipation, which replaces the traditional passive heat dissipation or additional heat dissipation components. This effectively improves heat dissipation efficiency. At the same time, the limiting component between the shaft core 2 and the plastic magnetic ring 1 enhances the connection by restricting their relative movement, avoiding the generation of additional heat due to relative sliding. The increased contact area accelerates the heat transfer between the shaft core 2 and the plastic magnetic ring 1, which, together with the airflow of the spiral channel, dissipates the heat. Thus, without increasing the size of the motor or energy consumption, the problems of low efficiency and poor stability of existing heat dissipation methods are solved.

[0027] The spiral channel 11 inside the plastic magnetic ring 1 can be a combination mold with a spiral core. The moving mold side is provided with a spiral core (the core surface is a spiral protrusion, which is complementary to the shape of the channel) that matches the parameters of the spiral channel (lead, pitch, diameter). The fixed mold side is provided with a corresponding positioning structure to ensure that the core and the cavity are precisely matched. At the same time, an injection gate (usually a side gate or a point gate) is reserved to facilitate the uniform filling of the melt into the small area of ​​the spiral channel. When demolding, the moving mold and the fixed mold separate. The servo motor or hydraulic drive mechanism built into the mold drives the spiral core to rotate along its axis and simultaneously pull it away axially (the rotation direction is consistent with the spiral channel direction). It gradually separates from the spiral channel inside the plastic magnetic ring 1 and finally completes the demolding, resulting in a plastic magnetic ring 1 with a through spiral channel.

[0028] The shaft core 2 has a hollow structure, and the inner cavity of the shaft core 2 is filled with highly thermally conductive silicone.

[0029] During operation, the heat generated by the shaft core 2 itself and the heat transferred to the shaft core 2 by the plastic magnetic ring 1 can be quickly conducted to the inner wall and outer peripheral surface of the shaft core 2 through the high thermal conductivity silicone. The heat transferred to the outer peripheral surface of the shaft core 2 can be transferred to the plastic magnetic ring 1 more efficiently through the limiting component, and then carried away by the airflow of the spiral channel. At the same time, the hollow structure combined with the high thermal conductivity silicone can reduce the accumulation of heat inside the shaft core 2, forming a better heat conduction path and helping to improve the overall heat dissipation effect.

[0030] The inner wall of the shaft core 2 is fixedly connected with a plurality of reinforcing rings 22, and the plurality of reinforcing rings 22 are equidistantly distributed in the inner cavity of the shaft core 2.

[0031] When the rotor rotates at high speed, it can disperse the radial stress generated by the centrifugal force of the shaft core 2 through its own structure, enhance the deformation resistance of the shaft core 2, avoid the deformation of the shaft core 2 due to high speed rotation, and avoid affecting the fitting accuracy with the plastic magnetic ring 1 and the airflow path of the spiral channel, ensure the stable heat dissipation function of the spiral channel 11, and at the same time ensure the long-term reliability of the connection between the shaft core 2 and the plastic magnetic ring 1.

[0032] The limiting component includes: a plurality of rectangular blocks 21, which are fixedly connected to the outer peripheral wall of the shaft core 2 and are distributed in a circular manner at equal intervals on the outer peripheral wall of the shaft core 2; and a plurality of rectangular grooves 13, which are formed on the inner wall of the connecting hole 12 and are distributed in a circular manner at equal intervals on the inner wall of the connecting hole 12.

[0033] During operation, the rectangular block 21, embedded in the rectangular groove 13, can directly restrict the relative movement of the shaft core 2 and the plastic magnetic ring 1 in the circumferential and axial directions, ensuring that the two rotate synchronously and reducing the additional heat generated by relative friction. At the same time, the rectangular block 21 increases the contact area between the shaft core 2 and the plastic magnetic ring 1, allowing the heat of the shaft core 2 to be quickly transferred to the plastic magnetic ring 1 through the rectangular block 21 and then discharged by the airflow of the spiral channel, thereby enhancing the connection firmness and strengthening heat dissipation conduction.

[0034] The number of rectangular slots 13 is the same as the number of rectangular blocks 21, and the positions of the rectangular slots 13 correspond to the positions of the rectangular blocks 21 and are adapted in size.

[0035] The rectangular slots 13 and rectangular blocks 21 are the same in number, corresponding in position, and matched in size. This ensures that the rectangular blocks 21 are completely embedded in the rectangular slots 13, avoiding relative shaking caused by gaps between them, reducing the extra energy consumption and heat caused by vibration. At the same time, the tightly fitting structure can eliminate the thermal resistance caused by contact gaps, making the heat transfer from the shaft core 2 to the plastic magnetic ring 1 smoother, further improving heat dissipation efficiency and structural stability.

[0036] The rectangular blocks 21 are integrally formed with the shaft core 2.

[0037] This avoids the risk of loosening caused by an insecure connection between the rectangular block 21 and the shaft core 2, ensuring that the limiting component continuously and stably restricts the relative movement between the shaft core 2 and the plastic magnetic ring 1 when the rotor rotates at high speed. At the same time, the one-piece molding structure eliminates the connection gap between the rectangular block 21 and the shaft core 2, reduces the resistance in the heat transfer process, and allows the heat of the shaft core 2 to be directly and efficiently transferred to the plastic magnetic ring 1 through the rectangular block 21, enhancing the heat dissipation effect, simplifying the processing flow, and ensuring structural consistency.

[0038] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A plastic magnetic rotor for a fan motor, characterized in that, include: A plastic magnetic ring (1) has a connecting hole (12) through the middle of the plastic magnetic ring (1) along the axial direction, and a spiral channel (11) is provided inside the plastic magnetic ring (1) along its axial direction, and the spiral channel (11) is arranged through the plastic magnetic ring (1) along the axial direction. A shaft core (2) is embedded in the connecting hole (12). A limiting component is provided between the outer peripheral surface of the shaft core (2) and the inner wall of the connecting hole (12). The limiting component is used to limit the relative movement of the shaft core (2) and the plastic magnetic ring (1) to improve the firmness of the connection between the two. At the same time, the limiting component can increase the heat dissipation area between the shaft core (2) and the plastic magnetic ring (1) to improve the heat dissipation effect.

2. A plastic magnetic rotor for a fan motor according to claim 1, characterized in that, The shaft core (2) has a hollow structure, and the inner cavity of the shaft core (2) is filled with highly thermally conductive silicone.

3. A plastic magnetic rotor for a fan motor according to claim 1, characterized in that, The inner wall of the shaft core (2) is fixedly connected with a plurality of reinforcing rings (22), and the plurality of reinforcing rings (22) are equidistantly distributed in the inner cavity of the shaft core (2).

4. A plastic magnetic rotor for a fan motor according to claim 1, characterized in that, The limiting component includes: Multiple rectangular blocks (21) are fixedly connected to the outer peripheral wall of the shaft core (2), and the multiple rectangular blocks (21) are distributed in a circular pattern at equal intervals on the outer peripheral wall of the shaft core (2). Multiple rectangular grooves (13) are formed on the inner wall of the connecting hole (12), and the multiple rectangular grooves (13) are distributed in a circular pattern at equal intervals on the inner wall of the connecting hole (12).

5. A plastic magnetic rotor for a fan motor according to claim 4, characterized in that, The number of rectangular slots (13) is the same as the number of rectangular blocks (21), and the position of the rectangular slots (13) corresponds to the position of the rectangular blocks (21) and the size is compatible.

6. A plastic magnetic rotor for a fan motor according to claim 4, characterized in that, Multiple rectangular blocks (21) are integrally formed with the shaft core (2).

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