Noise reduction fan and motor comprising same

Abstract

The utility model discloses a noise reduction fan and a motor comprising the same. The noise reduction fan comprises a front disc, blades and a rear disc, the rear disc is connected with a transmission shaft of the motor, and the front disc and the rear disc are coaxially arranged; the two ends of each blade are connected with the front disc and the rear disc respectively. At least three groups of blades are non-uniformly arranged in the circumferential direction of the rear disc, and the number of the blades is an odd number; and the plurality of groups of blades at least comprise two types of blades with different thicknesses. The motor has the characteristics of compact structure, convenience in installation and adjustment, low manufacturing cost, low aerodynamic noise and the like, and overcomes the defect of overlarge noise of the existing cooling motor with a fan.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a noise-reducing fan and a motor comprising the same. Background Art

[0002] At present, the noise of a motor cooled by a built-in fan mainly consists of three parts: electromagnetic noise, mechanical noise, and aerodynamic noise. Electromagnetic noise: mainly related to electromagnetism, mostly appears in the medium and low speed sections; Mechanical noise: mainly related to bearings and dynamic imbalance, commonly found in the high-speed region or certain specific speed points. Aerodynamic noise: mainly related to the air flow disturbance of the fan and the flow channel, mostly appears in the high-speed section.

[0003] Considering that the high-speed operation of the motor is beneficial to the improvement of power density, torque density, etc., the high-speed operation of the motor has received increasing attention. Among them, the aerodynamic noise caused by the fan has become the main noise source of the motor. With the increasingly strict noise standards in the industry, the suppression of fan noise is the key bottleneck and the only way for the high-speed operation of the motor.

[0004] In the prior art, the fan structure of a motor cooled by a built-in fan is as Figure 1 and Figure 2 shown, which is composed of a front disc 1, a rear disc 3, and blades 2. Among them, the number of blades 2 is usually odd and is evenly arranged in the circumferential direction, and the thickness of the blades 2 is the same. There is still a large amount of aerodynamic noise during the operation of the existing fan, which is difficult to meet the low-noise requirements of the high-speed operation of the motor. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a noise-reducing fan and a motor comprising the same, which are structurally compact, convenient for installation and adjustment, low in manufacturing cost, and low in aerodynamic noise, aiming at the defect of excessive noise of the existing motor cooled by a built-in fan.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0007] A noise-reducing fan, comprising: a front disc, blades, and a rear disc; the rear disc is connected to the transmission shaft of the motor, and the front disc is coaxially arranged with the rear disc; both ends of the blades are respectively connected to the front disc and the rear disc; at least three groups of the blades are unevenly arranged along the circumferential direction of the rear disc, and the number of the blades is odd; at least two different thicknesses of blades are included in the multiple groups of blades.

[0008] As a further improvement of the utility model, the blades include serrated blades, and serrated holes are formed on the trailing edge and / or the leading edge of the blades.

[0009] As a further improvement of the utility model, the serrated holes are in a wavy shape, an isosceles triangle shape, or a trapezoid shape.

[0010] As a further improvement of the present utility model, the blade includes an airfoil blade.

[0011] As a further improvement of the present utility model, the airfoils of all the blades are the same, or the airfoils of the blades include at least two types.

[0012] As a further improvement of the present utility model, the blade further includes a straight blade.

[0013] As a further improvement of the present utility model, the blade includes a first meridian plane, a second meridian plane, a third meridian plane and a fourth meridian plane. The first meridian plane is connected to the front disc, the fourth meridian plane is connected to the rear disc, and both the second meridian plane and the third meridian plane are arc-shaped.

[0014] As a further improvement of the present utility model, the circumferential angles of all the blades are inconsistent, or the circumferential angles of some of the blades are inconsistent.

[0015] As a general technical concept, the present utility model further provides a motor including the above noise reduction fan.

[0016] Compared with the prior art, the advantages of the present utility model are as follows:

[0017] The noise reduction fan of the present utility model and the motor including the same form a compact noise reduction fan main body by connecting the two ends of the blade to the front disc and the rear disc respectively. Further, at least three groups of blades are arranged non-uniformly along the circumferential direction of the rear disc, and the number of blades is odd, which can weaken each other with different order noises in the fan noise to reduce the overall noise. At the same time, at least two types of blades with different thicknesses are included in the multiple groups of blades, which can also weaken and cancel each other specific order noises to reduce the noise, and finally reduce the noise value of the self-cooling fan motor. Description of the Drawings

[0018] Figure 1 is a schematic cross-sectional structure diagram of a fan in the prior art;

[0019] Figure 2 is a schematic diagram of the blade distribution of a fan in the prior art;

[0020] Figure 3 is one of the schematic cross-sectional structure principle diagrams of the noise reduction fan in a specific embodiment of the present utility model;

[0021] Figure 4 is a schematic diagram of the blade distribution of the noise reduction fan in a specific embodiment of the present utility model;

[0022] Figure 5 is a schematic diagram of the blade thickness of the noise reduction fan in a specific embodiment of the present utility model;

[0023] Figure 6 It is the second schematic diagram of the sectional structure principle of the noise-reducing fan in the specific embodiment of the present utility model; among them, Fig. (a) is a sectional view, and Fig. (b) is a schematic diagram of the blade in the K direction in Fig. (a);

[0024] Figure 7 It is the third schematic diagram of the sectional structure principle of the noise-reducing fan in the specific embodiment of the present utility model;

[0025] Legend: 1. Front disc; 2. Blade; 3. Rear disc; 21. Uniform blade; 22. Airfoil blade; 23. First meridian plane; 24. Second meridian plane; 25. Third meridian plane; 26. Fourth meridian plane; 4. Blade trailing edge; 5. Blade leading edge. Specific embodiments

[0026] The present utility model will be further described below in conjunction with the accompanying drawings of the specification and specific preferred embodiments, but the protection scope of the present utility model is not limited thereby.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "side", "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more, unless otherwise specifically defined.

[0029] Embodiment 1

[0030] As Figures 3 to 5As shown in the figure, the noise reduction fan of the present utility model includes: a front disc 1, blades 2, and a rear disc 3. The rear disc 3 is connected to the transmission shaft of the motor, and the front disc 1 is coaxially arranged with the rear disc 3; both ends of the blade 2 are respectively connected to the front disc 1 and the rear disc 3. Eleven groups of blades 2 are arranged non-uniformly along the circumferential direction of the rear disc 3. By adjusting the spacing between the adjacent blades 2, the sound waves between the adjacent blades 2 can generate interference, and the distribution of the noise energy in the frequency spectrum can be changed, thereby reducing the human ear's perception of noise. In other embodiments, the number of the blades 2 is an odd number, which helps to eliminate the aerodynamic noise. At least two different thicknesses of the blades 2 are included in multiple groups of blades 2. As Figure 5 shown in it, the blade thicknesses L1, L2, L3, and L4 are all different.

[0031] In this embodiment, by connecting both ends of the blade 2 to the front disc 1 and the rear disc 3 respectively, a noise reduction fan main body with a compact structure is formed. Further, at least three groups of blades 2 are arranged non-uniformly along the circumferential direction of the rear disc 3, and the number of the blades 2 is an odd number, which can weaken different order noises in the fan noise with each other to reduce the overall noise. At the same time, at least two different thicknesses of the blades 2 are included in multiple groups of blades 2, which can also weaken and cancel each other specific order noises to reduce the noise, and finally the noise value of the self-cooling fan for the motor is reduced.

[0032] As Figure 3 shown in it, all the blades 2 are serrated blades, and serrated holes are opened on both the blade trailing edge 4 and the blade leading edge 5. Further, the serrated holes are in a wavy shape. In other embodiments, the serrated holes can be opened on the blade trailing edge 4 or the blade leading edge 5 alone, and the serrated holes are isosceles triangles or trapezoids. The trailing edge serration technology is a method of processing a serrated structure with a specific shape on the trailing edge of the fan blade, and these serrated structures can change the flow and turbulence characteristics of the air flow, thereby reducing the noise generated by the fan during operation.

[0033] Further, in this embodiment, the blade 2 further includes a straight blade. Combining the serrated blade with the straight blade can also achieve the expected noise reduction effect.

[0034] As Figure 4 shown in it, in this embodiment, the circumferential angles of all the blades 2 are inconsistent, that is, the values of the circumferential angles δ1, δ2, δ3, δ4, δ5, δ6, and δ7 are different from each other. In other embodiments, the circumferential angles of some of the blades 2 can also be inconsistent, as long as a better noise reduction effect can be achieved. By arranging the blades 2 non-uniformly in the circumferential direction, different order noises in the fan noise can be weakened with each other to reduce the overall noise.

[0035] This embodiment also provides a motor including the above-mentioned noise reduction fan.

[0036] Example 2

[0037] As Figure 3 , Figure 4 and Figure 6 shown, the noise reduction fan of this embodiment has a similar structural arrangement and working principle to the noise reduction fan in Embodiment 1. The main difference lies in that: the blade 2 includes an airfoil blade 22, and the airfoils of all the blades 2 are the same. In other embodiments, the airfoils of the blade 2 include at least two types, and by combining the blades 2 with various different airfoils, the wind noise at specific frequencies can be reduced, and the wind noises at different frequencies can also cancel each other out, thereby reducing the noise value of the self - contained fan - cooled motor. Compared with traditional blades, the airfoil blade 22 can better control the flow of air, reduce the generation of turbulence and pressure pulsation, and thus reduce the radiation of noise.

[0038] Furthermore, the blade 2 also includes a flat and uniform blade 21. By combining the uniform blade 21 with the airfoil blade 22, the purpose of reducing noise can also be achieved by weakening and mutually reducing the noise at specific orders.

[0039] Example 3

[0040] As Figure 3 , Figure 4 and Figure 7 shown, the noise reduction fan of this embodiment has a similar structural arrangement and working principle to the noise reduction fan in Embodiment 1. The main difference lies in that: the blade 2 includes a first meridian plane 23, a second meridian plane 24, a third meridian plane 25 and a fourth meridian plane 26. The first meridian plane 23 is connected to the front disc 1, the fourth meridian plane 26 is connected to the rear disc 3, and the second meridian plane 24 and the third meridian plane 25 are both circular arcs. By optimizing the structure of the meridian plane of the blade 2, both the air volume is guaranteed and the noise is reduced.

[0041] The reasonable design of the meridian plane profile can achieve more sufficient control of the air flow. By accurately calculating and optimizing the geometric shape of the blade, the meridian plane profile can make the air flow produce appropriate bending and turning on the blade surface, so that the air flow can pass through the fan more smoothly. Effective air flow control can reduce turbulence and resistance loss, reduce energy consumption, improve the efficiency and performance of the fan, and thus reduce the noise of the fan.

[0042] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above - mentioned embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A noise-reducing fan, characterized in that, Comprising: A front disc (1), blades (2) and a rear disc (3); the rear disc (3) is connected to the transmission shaft of the motor, and the front disc (1) is coaxially arranged with the rear disc (3); both ends of the blade (2) are respectively connected to the front disc (1) and the rear disc (3); at least three groups of the blades (2) are arranged non-uniformly along the circumferential direction of the rear disc (3), and the number of the blades (2) is odd; at least two different thicknesses of the blades (2) are included in multiple groups of the blades (2).

2. The noise reduction fan according to claim 1, wherein, The blade (2) includes a serrated blade, and serrated holes are formed on the trailing edge (4) and / or the leading edge (5) of the blade.

3. The noise reduction fan according to claim 2, characterized in that, The serrated holes are in a wavy shape, an isosceles triangle shape or a trapezoid shape.

4. The noise reduction fan according to claim 1, wherein, The blade (2) includes an airfoil blade (22).

5. The noise reduction fan according to claim 4, characterized in that, The airfoils of all the blades (2) are the same, or at least two airfoils of the blades (2) are included.

6. The noise reduction fan according to claim 2 or 4, characterized in that The blade (2) further includes a straight blade.

7. The noise reduction fan according to claim 1, wherein, The blade (2) includes a first meridian plane (23), a second meridian plane (24), a third meridian plane (25) and a fourth meridian plane (26), the first meridian plane (23) is connected to the front disc (1), the fourth meridian plane (26) is connected to the rear disc (3), and both the second meridian plane (24) and the third meridian plane (25) are arc-shaped.

8. The noise reduction fan according to any one of claims 1 to 5, characterized in that, The circumferential angles of all the blades (2) are inconsistent, or the circumferential angles of some of the blades (2) are inconsistent.

9. A motor, characterized in that, Including the noise-reducing fan according to any one of claims 1 to 8.

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