A fan structure

Abstract

The utility model discloses a fan structure, including rotor, the fan blade of being located the rotor outer circumferential side, the fan blade includes fan blade main part, the fan blade main part's windward side near the place of blade tip is equipped with the noise reduction part, the one side of fan blade main part away from the rotor is equipped with the thickening portion, and the thickness of thickening portion is greater than the thickness of fan blade main part. The utility model discloses a sawtooth noise reduction part is arranged at the blade tip of fan blade, makes fan blade in the rotation process, can reduce the wind noise. In addition, the thickening of fan blade edge is set up, is favorable to increase the air quantity air pressure.

Description

Technical Field

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

[0002] Existing fans tend to generate noise during operation, and excessive noise can severely impact the user experience, especially during summer nights when falling asleep, as a noisy fan can disrupt sleep. Some products reduce fan noise by lowering the fan hub height, but this doesn't fundamentally solve the problem of fan noise generation, and therefore the effect is still not ideal. Thus, designing a low-noise fan structure is a pursuit of fan industry professionals and a market necessity. Utility Model Content

[0003] In order to effectively reduce the noise of the fan during operation, this utility model provides a fan structure.

[0004] This utility model is achieved by the following solution: A fan structure includes a rotor and fan blades disposed on the outer periphery of the rotor. The fan blades include a fan blade body, a noise reduction part is provided on the windward edge of the fan blade body near the blade tip, and a thickened part is provided on the side of the fan blade body away from the rotor. The thickness of the thickened part is greater than the thickness of the fan blade body.

[0005] As described above, in a fan structure, the noise reduction part includes multiple noise reduction protrusions and multiple noise reduction recesses, which are alternately arranged side by side on the fan blade body.

[0006] In one fan structure as described above, the fan blades are arranged at an axial angle relative to the rotor.

[0007] In one fan structure as described above, the fan blades and the rotor are integrally injection molded.

[0008] The fan structure described above also includes a base, which is connected to a fan bracket. The rotor is rotatably connected to the base, and a brushless DC motor drive device for driving the rotor to rotate is provided between the rotor and the base.

[0009] In the fan structure described above, the rotor includes a rotor sidewall, and the brushless DC motor drive device includes a winding, a magnetic frame, and a circuit board. The winding is disposed within the base, the rotor sidewall is arranged around the outer periphery of the winding, the magnetic frame is disposed inside the rotor sidewall and cooperates with the winding, the winding is provided with a step portion, and the step portion is provided with an electrical connection terminal for electrically connecting the circuit board.

[0010] In the fan structure described above, the base is provided with a connecting shaft, the rotor includes a rotating shaft, the rotating shaft is inserted into the connecting shaft, and rotates in cooperation with the connecting shaft to make the rotor rotate relative to the base.

[0011] In the fan structure described above, the winding includes a stator sleeved on the connecting shaft and copper wires wound on the stator. The stator includes a sleeve portion for sleeved on the connecting shaft and stator silicon steel sheets arranged circumferentially along the sleeve portion. The strut portion is located at the end of the stator silicon steel sheet away from the sleeve portion.

[0012] In one fan structure as described above, the outer wall of the base extends to provide mounting ears.

[0013] In the fan structure described above, a first bearing and a second bearing are spaced apart on the rotating shaft, and the first bearing and the second bearing are adapted to the connecting shaft so that the rotating shaft can rotate within the connecting shaft. The connecting shaft is provided with a stop step and an elastic pressing member for elastically pressing between the stop step and the first bearing.

[0014] Compared with the prior art, this application has the following advantages: This invention reduces wind noise by incorporating serrated noise-reducing elements at the blade tips. Additionally, the thickened blade edges increase airflow and air pressure. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0016] Figure 1 This is a schematic diagram of the fan structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the connection structure between the fan blades and the rotor. Figure 1 .

[0018] Figure 3 This is a schematic diagram of the connection structure between the fan blades and the rotor. Figure 2 .

[0019] Figure 4 This is a schematic diagram of the connection structure between the fan blades and the rotor. Figure 3 .

[0020] Figure 5 This is a schematic diagram of the hidden fan blade structure of this utility model.

[0021] Figure 6 yes Figure 5 Sectional view along section AA.

[0022] Figure 7 yes Figure 5 Explosive decomposition diagram Figure 1 .

[0023] Figure 8 yes Figure 5 Explosive decomposition diagram Figure 2 .

[0024] Figure 9 This is a schematic diagram of the stator structure. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0026] When ordinal numbers such as "first" and "second" are mentioned in the embodiments of this application, unless they actually express the meaning of order according to the context, they should be understood as being used only for distinction.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] Example: Figures 1 to 9 As shown, this embodiment discloses a fan structure including a rotor 1 and fan blades 2 disposed on the outer periphery of the rotor 1. The fan blades 2 include a fan blade body 21. A noise reduction portion 3 is provided on the windward edge 22 of the fan blade body 21 near the blade tip 23. A thickened portion 4 is provided on the side of the fan blade body 21 away from the rotor 1, and the thickness of the thickened portion 4 is greater than the thickness of the fan blade body 21. In this embodiment, the noise reduction portion 3 includes multiple noise reduction protrusions 31 and multiple noise reduction recesses 32, which are alternately arranged side by side on the fan blade body 21, making the noise reduction portion 3 serrated. This embodiment reduces wind noise during fan blade rotation by providing a serrated noise reduction portion 3 at the blade tip 23. In addition, the thickened edge of the fan blade 2 helps to increase airflow and air pressure.

[0029] Furthermore, the fan blade 2 is inclined relative to the axial direction of the rotor. In this embodiment, the fan blade 2 is inclined overall, which further facilitates the increase of air volume and air pressure.

[0030] Furthermore, the fan blade 2 and the rotor 1 are integrally injection molded, which reduces manual assembly steps and helps to increase the overall structural strength of the fan blade 2.

[0031] Furthermore, the fan structure also includes a base 5, which can be connected to a fan bracket 6. The rotor 1 is rotatably connected to the base 5, and a brushless DC motor drive device 7 for driving the rotor 1 to rotate is provided between the rotor 1 and the base 5.

[0032] Furthermore, the rotor 1 includes a rotor sidewall 11, and the brushless DC motor drive device 7 includes a winding 71, a magnetic frame 72, and a circuit board 73. The winding 71 is disposed within the base 5, the rotor sidewall 11 is arranged around the outer periphery of the winding 71, and the magnetic frame 72 is disposed inside the rotor sidewall 11 and cooperates with the winding 71. The winding 71 is provided with a base portion 711, and the base portion 711 is provided with an electrical connection terminal 7111 for electrically connecting to the circuit board 73. In this embodiment, by providing a winding 71 connected to the circuit board 73 on the base 5, which cooperates with the magnetic frame 72 on the rotor 1, a brushless DC motor is formed to drive the rotor 1 to rotate when energized, replacing the traditional AC motor. This effectively reduces the overall size and weight of the drive device, better meeting the needs of modern users for simplicity and lightweight design. At the same time, its internal structure is simpler and more compact, assembly is more convenient, and it is also conducive to energy saving and reducing heat generation.

[0033] Furthermore, the base 5 is provided with a connecting shaft 51, and the rotor 1 includes a rotating shaft 12. The rotating shaft 12 is inserted into the connecting shaft 51 and rotates with the connecting shaft 51 to allow the rotor 1 to rotate relative to the base 5. Specifically, the connecting shaft 51 has an insertion channel 511 for the rotating shaft 12 to be inserted into. The insertion channel 511 extends axially through the connecting shaft 51, and a sealing cap 512 is provided at the end of the insertion channel 511 away from the rotor 1. The rotating shaft 12 is inserted into the interior of the connecting shaft 51, resulting in a large contact area and a long support length. This effectively resists various radial forces generated during fan blade rotation, such as uneven airflow and shaking caused by dynamic balance deviations, ensuring smooth rotor operation without radial slippage or severe vibration.

[0034] Furthermore, the winding 71 includes a stator 712 sleeved on the connecting shaft 51 and copper wire (not shown in the figure) for winding on the stator 712. The circuit board 73 is also sleeved on the connecting shaft 51. The stator 712 includes a sleeve portion 7121 for sleeved on the connecting shaft 51 and stator silicon steel sheets 7122 arranged circumferentially along the sleeve portion 7121. The strut portion 711 is located at the end of the stator silicon steel sheet 7122 away from the sleeve portion 7121. Four stator silicon steel sheets 7122 are circumferentially distributed on the sleeve portion 7121. The sleeve portion 7121 is directly and tightly sleeved on the connecting shaft 51, which ensures that the concentricity of the entire stator and rotor meets the usage requirements. This high-precision positioning ensures that the air gap between the rotor and stator is uniform and consistent, ensuring smooth operation of both, and the structure is simpler, more compact, and easier to assemble.

[0035] Furthermore, the outer side wall of the base 5 extends with mounting ear plates 52, which improves the ease of installation of the base 5. Preferably, the outer side wall of the base 5 is provided with four mounting ear plates 52 along the circumference. The four mounting ear plates 52 distributed circumferentially on the base 5 facilitate the fixed connection of the base 5 with other fixing brackets, which improves the ease of installation.

[0036] Furthermore, a first bearing 13 and a second bearing 14 are spaced apart on the rotating shaft 12, and the first bearing 13 and the second bearing 14 are adapted to the connecting shaft 51, allowing the rotating shaft 12 to rotate within the connecting shaft 51. In this embodiment, the first bearing 13 is located at the end of the rotating shaft 12 away from the rotor 1, and the second bearing 14 is located at the end of the rotating shaft 12 closer to the rotor 1. The dual-bearing structure of the first bearing 13 and the second bearing 14 provides two support points, effectively distributing the bending moment and radial force from the rotor 1. This greatly enhances the bending and deformation resistance of the rotating shaft 12 and the entire rotor 1. The dual-support-point structure also significantly suppresses radial runout and oscillation of the rotor 1. Even minor dynamic imbalances can be well absorbed, ensuring that the fan structure of this embodiment operates more smoothly and quietly within the speed range, achieving a high level of quiet operation.

[0037] Furthermore, the connecting shaft 51 is provided with a stop step 53 and an elastic pressing member 8 for elastically pressing between the stop step 53 and the first bearing 13. Preferably, the elastic pressing member 8 in this embodiment is a pressing spring. By setting the elastic pressing member 8 to continuously press the first bearing 13, noise caused by axial movement is effectively avoided, ensuring that the rotor 1 can also operate smoothly in the axial direction.

[0038] Furthermore, one of the base 5 and the rotor 1 is provided with an annular mounting groove 91, and the other is provided with an annular protrusion 92 extending into the annular mounting groove 91. The annular mounting groove 91 and the annular protrusion 92 are located on the outside of the magnetic frame 72. By providing the annular mounting groove 91 and the annular protrusion 92, the connection sealing between the rotor 1 and the base 5 can be ensured.

[0039] Furthermore, the rotating shaft 12 is provided with an anti-disengagement snap ring 121 on the side of the first bearing 13 facing away from the second bearing 14. By setting the anti-disengagement snap ring 121 to cooperate with the first bearing 13, the elastic pressing member 8 and the stop step 53, the rotor 1 can be effectively prevented from detaching from the base 5 along the axial direction.

[0040] The working principle of this embodiment is as follows: In this embodiment, the noise reduction part 3 includes multiple noise reduction protrusions 31 and multiple noise reduction recesses 32. These protrusions and recesses are alternately arranged side-by-side on the fan blade body 21, giving the noise reduction part 3 a serrated shape. This embodiment reduces wind noise during fan blade rotation by providing a serrated noise reduction part 3 at the blade tip 23. Furthermore, the thickened edge of the fan blade 2 helps increase airflow and air pressure.

[0041] The above description is one implementation method provided in conjunction with specific content, and does not imply that the specific implementation of this application is limited to these descriptions. Any methods or structures that are similar to or identical to those of this application, or any technical deductions or substitutions made based on the concept of this application, should be considered within the scope of protection of this application.

Claims

1. A fan structure, characterized in that, The device includes a rotor (1) and a fan blade (2) disposed on the outer periphery of the rotor (1). The fan blade (2) includes a fan blade body (21). The windward edge (22) of the fan blade body (21) is provided with a noise reduction part (3) near the blade tip (23). The fan blade body (21) is provided with a thickened part (4) on the side away from the rotor (1). The thickness of the thickened part (4) is greater than the thickness of the fan blade body (21).

2. The fan structure according to claim 1, characterized in that, The noise reduction part (3) includes multiple noise reduction protrusions (31) and multiple noise reduction recesses (32), which are alternately arranged side by side on the fan blade body (21).

3. The fan structure according to claim 1, characterized in that, The fan blade (2) is axially inclined relative to the rotor.

4. A fan structure according to claim 1, characterized in that, The fan blade (2) and the rotor (1) are integrally injection molded.

5. A fan structure according to any one of claims 1-4, characterized in that, It also includes a base (5), which is connected to a fan bracket (6), and the rotor (1) is rotatably connected to the base (5). A brushless DC motor drive device (7) for driving the rotor (1) to rotate is provided between the rotor (1) and the base (5).

6. A fan structure according to claim 5, characterized in that, The rotor (1) includes a rotor sidewall (11), and the brushless DC motor drive device (7) includes a winding (71), a magnetic frame (72), and a circuit board (73). The winding (71) is located inside the base (5), the rotor sidewall (11) is arranged around the outer periphery of the winding (71), the magnetic frame (72) is located inside the rotor sidewall (11) and cooperates with the winding (71), the winding (71) is provided with a base (711), and the base (711) is provided with an electrical connection terminal (7111) for electrically connecting the circuit board (73).

7. A fan structure according to claim 6, characterized in that, The base (5) is provided with a connecting shaft (51), and the rotor (1) includes a rotating shaft (12). The rotating shaft (12) is inserted into the connecting shaft (51) and rotates in cooperation with the connecting shaft (51) to make the rotor (1) rotate relative to the base (5).

8. A fan structure according to claim 7, characterized in that, The winding (71) includes a stator (712) sleeved on the connecting shaft (51) and copper wires for winding on the stator (712). The stator (712) includes a sleeve portion (7121) for sleeved on the connecting shaft (51) and a stator silicon steel sheet (7122) arranged circumferentially along the sleeve portion (7121). The stator foot portion (711) is located at the end of the stator silicon steel sheet (7122) away from the sleeve portion (7121).

9. A fan structure according to claim 5, characterized in that, The outer wall of the base (5) is provided with mounting ear plates (52).

10. A fan structure according to claim 7, characterized in that, The rotating shaft (12) is provided with a first bearing (13) and a second bearing (14) spaced apart, and the first bearing (13) and the second bearing (14) are adapted to the connecting shaft (51) so that the rotating shaft (12) can rotate within the connecting shaft (51). The connecting shaft (51) is provided with a stop step (53) and an elastic pressing member (8) for elastically pressing between the stop step (53) and the first bearing (13).

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