Fan

Abstract

The utility model relates to the technical field of fans, and provides a fan which comprises a motor unit. The motor unit comprises a motor shell, a blade driving motor and an L-shaped component; the blade driving motor and the L-shaped component are arranged in the motor shell; the blade driving motor is fixed on the L-shaped component; the L-shaped component is provided with a vertical surface and a transverse surface which are integrally formed; the transverse face is provided with a front side horizontal face, an inclined face and a rear side horizontal face which are integrally formed. Vertical plane bending parts are arranged on the two sides of the vertical plane; front side bending parts are arranged on the two sides of the front side horizontal plane and the two sides of the inclined plane; the two sides of the rear side horizontal plane are provided with rear side bent parts. According to the utility model, the operation stability, comfort and silence of the fan can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to a fan. Background Art

[0002] The brushless three-phase DC motor used in a fan is more suitable for low-speed operation than an AC motor. Therefore, it can achieve the gentle breeze operation preferred by users and has excellent comfort. The outer-rotor type brushless three-phase DC motor has been applied in products. However, the brushless three-phase DC motor needs to be provided with three Hall sensors to detect the rotor position, and the cost of the brushless three-phase DC motor is higher than that of the AC motor.

[0003] When attempting to apply the outer-rotor type single-phase DC motor to a fan to reduce costs, however, for the single-phase DC motor, the electromagnetic force generated by energization generates torque; and the fan blade is subject to a reaction force from the air, thereby generating a repetitive force in the axial direction of the motor, that is, the front and rear directions of the fan blade. Therefore, resonance will occur in the front and rear of the motor shaft and the blade, and the resonance will cause the fan to vibrate and generate noise, damaging the stability and comfort of the fan operation. In some cases within the gentle breeze to strong wind setting range of the fan, the quietness will be significantly reduced. Summary of the Utility Model

[0004] The utility model mainly solves the technical problem that in the prior art, for a fan with a single-phase DC motor, resonance will occur in the front and rear of the motor shaft and the blade, and the resonance will cause the fan to vibrate and generate noise, damaging the stability and comfort of the fan operation, and proposes a fan to be able to improve the stability, comfort and quietness of the fan operation.

[0005] The utility model provides a fan, including: a motor unit;

[0006] The motor unit includes: a motor housing, a blade driving motor and an L-shaped component;

[0007] The blade driving motor and the L-shaped component are arranged inside the motor housing; the blade driving motor is fixed on the L-shaped component;

[0008] The L-shaped component has a vertically formed vertical surface and a horizontally formed horizontal surface;

[0009] The horizontal surface has a front horizontal plane, an inclined plane and a rear horizontal plane integrally formed thereon.

[0010] Preferably, the connection between the vertical surface and the front horizontal plane, the connection between the front horizontal plane and the inclined plane, and the connection between the inclined plane and the rear horizontal plane all adopt a curved shape.

[0011] Preferably, both sides of the vertical surface have vertical surface bending portions;

[0012] Both sides of the front horizontal plane and the inclined plane have front bending portions;

[0013] Both sides of the rear horizontal plane are provided with rear bending parts.

[0014] Preferably, the vertical plane bending part and the front bending part are connected by welding or by a first screw, and the front bending part and the rear bending part are connected by welding or by a second screw.

[0015] Preferably, the vertical plane bending part, the front bending part, and the rear bending part are continuously press-formed.

[0016] Preferably, the vertical plane is formed by stamping.

[0017] Preferably, the motor unit is arranged on a pillar, and the pillar is arranged on a base.

[0018] Preferably, the blade driving motor has a motor shaft;

[0019] A blade is arranged on the motor shaft, and a protective cover is arranged outside the blade.

[0020] Preferably, a plug-in part is arranged on the bottom surface of the L-shaped part, and the plug-in part is fixed on the pillar.

[0021] Preferably, a swing motor is also arranged on the L-shaped part.

[0022] A fan provided by the present utility model is provided with an L-shaped part. The L-shaped part has a structure with high rigidity that is not easily bent and deformed and is low in cost; the fan with the L-shaped part can greatly reduce the resonance inside the fan. By increasing the rigidity, the front and rear vibration levels of the motor shaft can be reduced by 7-12 dB, so as to achieve significant noise reduction within the operating range (300-1100 rpm), and the fan runs to produce a comfortable sound that is not harsh. The present utility model can improve the stability, comfort, and quietness of the fan operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the fan provided by the present utility model;

[0024] Figure 2 is a schematic structural diagram of the motor unit provided in Embodiment 1 of the present utility model;

[0025] Figure 3 is a schematic structural diagram of the L-shaped part provided in Embodiment 1 of the present utility model;

[0026] Figure 4 is an effect diagram of the vibration level of the fan provided by the present utility model;

[0027] Figure 5 is a schematic structural diagram of the L-shaped part provided in Embodiment 2 of the present utility model.

[0028] Reference numerals: 1, base; 2, strut; 3, motor unit; 4, blade; 5, shield; 31, motor housing; 32, blade drive motor; 34, L-shaped component; 35, swing motor; 36, connector; 321, motor shaft; 341, vertical surface; 342, front horizontal surface; 343, inclined surface; 344, rear horizontal surface; 345, front bent portion; 346, rear bent portion; 347, vertical surface bent portion; 348, first screw; 349, second screw. Detailed implementation manners

[0029] To make the technical problems solved by the present utility model, the technical solutions adopted and the achieved technical effects clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model are shown in the drawings rather than all the content.

[0030] Embodiment 1

[0031] As Figure 1 shown, a fan provided by an embodiment of the present utility model includes: a base 1, a strut 2, a motor unit 3, a blade 4 and a shield 5.

[0032] The motor unit 3 is arranged on the strut 2, and the strut 2 is arranged on the base 1.

[0033] The motor unit 3 includes: a motor housing 31, a blade drive motor 32 and an L-shaped component 34. The blade drive motor 32 has a motor shaft 321; the blade 4 is arranged on the motor shaft 321, and the outside of the blade 4 is covered with a shield 5. The blade drive motor 32 is a single-phase brushless DC motor, and the blade drive motor 32 can drive the blade 4 to rotate within the shield 5. The bottom surface of the L-shaped component 34 is provided with a connector 36, and the connector 36 is fixed on the strut 2.

[0034] The blade drive motor 32 and the L-shaped component 34 are arranged within the motor housing 31; the blade drive motor 32 is fixed on the L-shaped component 34. A swing motor 35 is also arranged on the L-shaped component 34.

[0035] As Figure 2 、 3 shown, the L-shaped component 34 has an integrally formed vertical surface 341 and a transverse surface; the vertical surface 341 is used to mount the blade drive motor 32, the blade drive motor 32 is fixed on the vertical surface 341 with screws, and the motor shaft 321 passes through the vertical surface 341.

[0036] The lateral surface has a front horizontal plane 342, an inclined plane 343, and a rear horizontal plane 344 integrally formed. A swing motor 35 is fixed on the rear horizontal plane 344. The front horizontal plane 342 is at a lower position and the rear horizontal plane 344 is at a higher position, and they are continuously formed through the inclined plane 343.

[0037] The connection between the vertical plane 341 and the front horizontal plane 342, the connection between the front horizontal plane 342 and the inclined plane 343, and the connection between the inclined plane 343 and the rear horizontal plane 344 all adopt a curved shape, making it more difficult to bend the L-shaped component 34, increasing the strength of the L-shaped component 34, and reducing the vibration level in the range of 200 - 300 Hz, so that the noise of the fan can be reduced in the medium and high speed ranges.

[0038] Furthermore, both sides of the vertical plane 341 have vertical plane bending parts 347; both sides of the front horizontal plane 342 and the inclined plane 343 have front bending parts 345; both sides of the rear horizontal plane 344 have rear bending parts 346.

[0039] Among them, the vertical plane bending part 347 is connected to the front bending part 345, and the front bending part 345 is connected to the rear bending part 346. The connection forms can be selected: in this embodiment, the vertical plane bending part 347 and the front bending part 345 are connected by welding or by a first screw 348, and the front bending part 345 and the rear bending part 346 are connected by welding or by a second screw 349. In a more preferred embodiment, the vertical plane bending part 347 and the front bending part 345 are connected by welding, and the front bending part 345 and the rear bending part 346 are connected by welding.

[0040] The L-shaped component 34 can be made of a steel plate with a thickness of 2 mm. The vertical plane 341 is formed by stamping. A front cover is provided at the front end of the L-shaped component 34. The front cover is made of a glass fiber reinforced resin material and is modeled and made using 3D printing technology, thereby improving the stiffness of the fan and achieving the effect of noise reduction in the medium and high speed ranges.

[0041] As Figure 4 shown, by conducting an operation statistical analysis on the fan of the present utility model, compared with the traditional fan represented by the dotted line, the fan of the present utility model represented by the solid line shows the effect of reducing the vibration level before and after the motor shaft. The noise of the fan can be significantly reduced. For the fan of the present utility model, the resonance of the motor shaft at a frequency of 126 Hz is reduced by 10.6 dB, and the resonance of the motor shaft at a frequency of 182 Hz is reduced by 6.84 dB. The largest resonance at 224 Hz has been shifted outside the operating range. Four peaks are observed in the range of 80 - 300 Hz, which is basically consistent with the resonance characteristics of the actual machine.

[0042] The utility model reduces the vibration level caused by resonance by 7 - 12 dB by setting an L - shaped component 34 in a single - phase DC motor with an 8 - pole 8 - slot type and a household fan with a blade of 30 - 35 cm in diameter. In this way, significant noise reduction can be achieved within the operating range (300 - 1100 rpm).

[0043] Embodiment 2

[0044] This embodiment gives another structure of the L - shaped component 34, which is different from Embodiment 1 in that: the connection form of the vertical - surface bending part 347 and the front - side bending part 345 and the connection form of the front - side bending part 345 and the rear - side bending part 346. Specifically, in this embodiment, as Figure 5 shown, the vertical - surface bending part 347, the front - side bending part 345, and the rear - side bending part 346 are continuously press - formed.

[0045] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: modifying the technical solutions recorded in the foregoing embodiments, or equivalently replacing some or all of the technical features therein, does not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A fan, comprising: The motor unit (3) is characterized in that: The motor unit (3) comprises: a motor housing (31), a blade drive motor (32) and an L-shaped component (34); The blade drive motor (32) and the L-shaped component (34) are arranged in the motor housing (31); the blade drive motor (32) is fixed on the L-shaped component (34); The L-shaped component (34) has an integrally formed vertical surface (341) and a transverse surface; The transverse surface has a front horizontal surface (342), an inclined surface (343) and a rear horizontal surface (344) formed integrally.

2. The fan according to claim 1, characterized in that The connection between the vertical plane (341) and the front horizontal plane (342), the connection between the front horizontal plane (342) and the inclined plane (343), and the connection between the inclined plane (343) and the rear horizontal plane (344) are all in a curved shape.

3. The fan according to claim 1 or 2, characterized in that: Both sides of the vertical surface (341) are provided with vertical surface bending portions (347); Both sides of the front horizontal surface (342) and the inclined surface (343) are provided with front bending portions (345); The two sides of the rear horizontal surface (344) are provided with rear bending portions (346).

4. The fan according to claim 3, characterized in that: The vertical surface bending portion (347) is connected to the front side bending portion (345) by welding or by a first screw (348), and the front side bending portion (345) is connected to the rear side bending portion (346) by welding or by a second screw (349).

5. The fan according to claim 3, characterized in that: The vertical surface bending portion (347), the front side bending portion (345), and the rear side bending portion (346) are continuously pressed and formed.

6. The fan according to claim 1, characterized in that: The vertical surface (341) is formed by stamping.

7. The fan according to claim 1, characterized in that: The motor unit (3) is arranged on a support column (2), and the support column (2) is arranged on a base (1).

8. The fan according to claim 7, characterized in that: The blade drive motor (32) has a motor shaft (321); The motor shaft (321) is provided with a blade (4), and the blade (4) is externally covered with a protective cover (5).

9. The fan according to claim 1, characterized in that: A plug-in connector (36) is arranged on the bottom surface of the L-shaped component (34), and the plug-in connector (36) is fixed on the pillar (2).

10. The fan according to claim 1, characterized in that The L-shaped component (34) is also provided with a shaking motor (35).

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