Hawk-beak type fan blade and fan

Abstract

The utility model discloses an eagle-beak-shaped fan blade and a fan, belonging to the technical field of fans, comprising a hub and a plurality of blades arranged around the hub, wherein the leading edge of the blade is provided with an eagle-beak-shaped tip; the blade comprises a blade body and a blade flange formed by warping along the outer edge of the blade body, the leading edge of the blade body extends forward as it gradually moves away from the hub, and the leading edge of the blade flange extends backward as it gradually moves away from the hub. A fan comprises an eagle-beak-shaped fan blade. The fan blade of the utility model can adapt to outdoor working environments, cut off foreign matter, maintain the high efficiency and stability of the fan blade operation, extend the service life of the blade, and improve the anti-back pressure performance, reduce noise, and improve the energy efficiency of the fan operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of fans, and in particular relates to an eagle-beak type fan blade and a fan. Background Art

[0002] As the demand for outdoor use of products increases, requirements are put forward for the internal cooling fans of products to be suitable for outdoor environments. That is, when the cooling fans are used outdoors, they can ensure their continuous and stable normal operation while meeting the relevant requirements for heat dissipation in outdoor scenes.

[0003] Tests show that the fan will expose the air inlet and outlet due to ventilation, and the rotation of the fan blades will be disturbed by foreign objects, specifically common outdoor branches and leaves that enter the fan from the air inlet / outlet and then stay in the area near the fan blades; water vapor freezes in a low temperature environment, and the ice also stays in the area near the fan blades.

[0004] In the prior art, the blades of the cooling fan do not have a cutting function. As the fan runs, the blades are constrained by foreign objects and cannot rotate. If the motor drives the fan to rotate forcibly, the foreign objects will be broken by the leading edge of the blades, causing the blades to be damaged and broken. At the same time, the cooling fan will generate airflow during operation. These airflows will encounter fan back pressure at the fan outlet, resulting in a decrease in fan air volume and an increase in noise. Utility Model Content

[0005] The utility model provides an eagle-beak type fan blade and a fan, which are used to solve the problem that the existing heat dissipation fan is affected by foreign objects when running outdoors.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: an eagle-beak-shaped fan blade, comprising a hub, and a plurality of blades arranged around the circumference of the hub, wherein the leading edge of the blade is provided with an eagle-beak-shaped tip;

[0007] The blade comprises a blade body and a blade flange formed by warping along the outer edge of the blade body, the leading edge of the blade body extends forward as it gradually moves away from the hub, and the leading edge of the blade flange extends backward as it gradually moves away from the hub;

[0008] In the axial projection of the hub, the leading edge projection of the blade body forms a first leading edge line, and the leading edge projection of the blade flange forms a second leading edge line. The first leading edge line and the second leading edge line intersect at a vertex, and the angle between the tangent of the first leading edge line at the vertex and the tangent of the second leading edge line at the vertex is an obtuse angle.

[0009] Specifically, the first leading edge line is an arc line that curves toward the direction where the blade body is located.

[0010] Specifically, the included angle between the tangent line of the first leading edge line at the vertex and the second leading edge line is 120°.

[0011] Specifically, a notch is provided at the trailing edge of the blade, the trailing edge of the blade body extends forward as it gradually moves away from the hub, and the trailing edge of the blade flange extends backward as it gradually moves away from the hub. In the axial projection of the hub, the trailing edge projection of the blade body forms a first trailing edge line, and the trailing edge projection of the blade flange forms a second trailing edge line. The first trailing edge line and the second trailing edge line intersect at a notch, and the angle between the tangent of the first trailing edge line at the notch and the tangent of the second trailing edge line at the notch is an obtuse angle.

[0012] Specifically, the angle between the tangent line of the first trailing edge line at the concave point and the tangent line of the second trailing edge line at the concave point is 120°.

[0013] Specifically, the second leading edge line is a straight line.

[0014] Specifically, as any point on the first leading edge line gradually approaches the vertex, the angle between the tangent line of the any point and the second leading edge line gradually decreases.

[0015] Specifically, the blade body includes a blade root having an inner side fitting the hub and an outer side arranged relative to the inner side. The blade root is formed by a plurality of blade profiles fused from the inner side to the outer side, and the width of the blade profile gradually increases from the outer side to the inner side.

[0016] The embodiment of the present application also discloses: a fan, which includes the hawk-beak-shaped fan blades as described in the embodiment.

[0017] Compared with the prior art, the technical solution provided by the utility model has the following advantages:

[0018] 1. The blades are equipped with eagle-beak tips to ensure the strength of the blades. When the fan blades are running, they can cut off blocking foreign objects such as branches and leaves, break off attached foreign objects such as ice cubes, maintain the efficiency and stability of the fan blades, and extend the service life of the blades;

[0019] 2. Set the blade flange to form an eagle-beak tip at the leading edge of the blade and a notch at the trailing edge of the blade to improve the blade's resistance to back pressure, increase the fan's air output, meet the requirements for improving the heat dissipation performance of outdoor operation, reduce noise, and improve the energy efficiency of the fan operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a structural diagram of the hawk-beak type fan blade in this embodiment;

[0021] Figure 2 It is an orthographic projection diagram of the hawk-beak type fan blade in the axial direction of the hub in this embodiment;

[0022] Figure 3 is an orthographic projection of the blade in the axial direction of the hub in this embodiment;

[0023] Figure 4 : is a noise index analysis diagram of the hawk-beak fan blade under back pressure in this embodiment;

[0024] Figure 5 is a simulation diagram of the anti-back pressure of the hawk-beak fan blade in this embodiment;

[0025] Figure 6 is another anti-back pressure simulation diagram of the hawk-beak fan blade in this embodiment;

[0026] Figure 7 It is a structural diagram of the fan in this embodiment.

[0027] As shown in the figure:

[0028] 1. Hub; 2. Blade; 21. Blade body; 211. First leading edge line; 212. First trailing edge line; 22. Blade flange; 221. Second leading edge line; 222. Second trailing edge line; 23. Eagle beak tip; 24. Notch; 25. Vertex; 26. Concave point; 27. Blade root; 3. Fan frame. DETAILED DESCRIPTION

[0029] For ease of understanding, the hawk-beak-style fan blade and the fan are described below in conjunction with embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation and positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figure 1As shown, an eagle-beak fan blade includes an integrally formed hub 1 and blades 2, the hub 1 is cylindrical, and seven blades 2 are arranged around the outer circumference of the hub 1, the blade 2 includes a blade body 21 and a blade flange 22, wherein the blade flange 22 is connected to the outer edge of the blade body 21, and the blade flange 22 is raised along the outer edge of the blade body 21, and an arc groove is formed between the back side of the blade flange 22 and the back side of the blade body 21.

[0033] Continue as Figure 1 As shown, the blade 2 is formed by the fusion of several blade profiles, and the blade 2 body includes a blade root 27, that is, the blade root 27 is also formed by the fusion of several blade profiles, wherein the blade profile is designed according to the NACA standard airfoil, and the blade root 27 has an inner side that fits the hub 1 and an outer side that is arranged relatively to the inner side. From the outer side to the inner side, the blade profile width of the blade root 27 gradually increases, so that the root of the blade 2 is thickened and the strength of the fan blade is enhanced.

[0034] like Figure 2 As shown, with the hub 1 in the figure as the center, the clockwise direction is the forward direction, and the counterclockwise direction is the backward direction. The leading edge of the blade body 21 extends forward as it gradually moves away from the hub 1, and the leading edge of the blade flange 22 extends backward as it gradually moves away from the hub 1. In other words, an eagle-beak tip 23 is provided at the leading edge of the blade 2. During the clockwise rotation of the fan blade, the eagle-beak tip 23 can effectively cut off foreign matter. The trailing edge of the blade body 21 extends forward as it gradually moves away from the hub 1, and the trailing edge of the blade flange 22 extends backward as it gradually moves away from the hub 1. In other words, a V-shaped notch 24 is provided at the trailing edge of the blade 2. The notch 24 design allows the fan blade to be demoulded directly after molding, while improving the back pressure resistance of the blade 2.

[0035] like Figure 2 As shown, in the axial projection of the hub 1, Figure 3 As shown, the leading edge projection of the blade body 21 forms a first leading edge line 211, the leading edge projection of the blade flange 22 forms a second leading edge line 221, the first leading edge line 211 and the second leading edge line 221 intersect at the vertex 25, and the angle between the tangent of the first leading edge line 211 at the vertex 25 and the tangent of the second leading edge line 221 at the vertex 25 is 120°. In the axial projection of the hub 1, the trailing edge projection of the blade body 21 forms a first trailing edge line 212, the trailing edge projection of the blade flange 22 forms a second trailing edge line 222, the first trailing edge line 212 and the second trailing edge line 222 intersect at the concave point 26, and the angle between the tangent of the first trailing edge line 212 at the concave point 26 and the tangent of the second trailing edge line 222 at the concave point 26 is 120°.

[0036] Continue as Figure 3As shown, the first leading edge line 211 is an arc line that bends toward the direction of the blade body 21 . As any point on the first leading edge line 211 gradually approaches the vertex 25 , the angle between the tangent of the arbitrary point and the tangent of the second leading edge line 221 at the vertex 25 gradually decreases.

[0037] Continue as Figure 3 As shown, in a preferred implementation manner of this embodiment, the second leading edge line 221 is a straight line, and as any point on the first leading edge line 211 gradually approaches the vertex 25, the angle between the tangent line of the arbitrary point and the second leading edge line 221 gradually decreases.

[0038] like Figures 4 to 6 As shown, the hawkbill fan blades in this embodiment are measured for their resistance to back pressure, and the non-hawkbill fan blades are tested for their resistance to back pressure to obtain the noise index of the above-mentioned fan blades under back pressure as shown in the figure. Among them, as the back pressure increases, the noise index of the hawkbill fan blades in this embodiment first decreases and then increases under back pressure, which is curve A in the figure. As the back pressure increases, the noise index of the non-hawkbill fan blades under back pressure first decreases and then increases, which is curve B in the figure. According to the comparison between curve A and curve B, it can be seen that under the same back pressure intensity of the hawkbill fan blades and the non-hawkbill fan blades in this embodiment, the total sound pressure level (dBA) of the hawkbill fan blades in this embodiment is lower than the total sound pressure level (dBA) of the non-hawkbill fan blades.

[0039] like Figure 7 As shown, the fan in this embodiment includes a fan frame 3, a motor, a fan shaft, and hawk-beak fan blades arranged in the center of the fan frame 3. The motor drives the hawk-beak fan blades to rotate relative to the fan frame 3 with the fan shaft as the center.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them. Although the utility model has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. An eagle-beak fan blade, characterized in that: It comprises a hub, and a plurality of blades arranged around the hub, wherein the leading edges of the blades are provided with hawk-beak-shaped tips; The blade comprises a blade body and a blade flange formed by warping along the outer edge of the blade body, the leading edge of the blade body extends forward as it gradually moves away from the hub, and the leading edge of the blade flange extends backward as it gradually moves away from the hub; In the axial projection of the hub, the leading edge projection of the blade body forms a first leading edge line, and the leading edge projection of the blade flange forms a second leading edge line. The first leading edge line and the second leading edge line intersect at a vertex, and the angle between the tangent of the first leading edge line at the vertex and the tangent of the second leading edge line at the vertex is an obtuse angle.

2. The hawk-beak fan blade according to claim 1, characterized in that: The first leading edge line is an arc line that curves toward the direction where the blade body is located.

3. The hawk-beak fan blade according to claim 1, characterized in that: The included angle between the tangent line of the first leading edge line at the vertex and the second leading edge line is 120°.

4. The hawk-beak fan blade according to claim 1, characterized in that: The trailing edge of the blade is provided with a notch, the trailing edge of the blade body extends forward as it gradually moves away from the hub, and the trailing edge of the blade flange extends backward as it gradually moves away from the hub. In the axial projection of the hub, the trailing edge projection of the blade body forms a first trailing edge line, and the trailing edge projection of the blade flange forms a second trailing edge line. The first trailing edge line and the second trailing edge line intersect at a notch, and the angle between the tangent of the first trailing edge line at the notch and the tangent of the second trailing edge line at the notch is an obtuse angle.

5. The hawk-beak fan blade according to claim 4, characterized in that: An angle between a tangent line of the first trailing edge line at the concave point and a tangent line of the second trailing edge line at the concave point is 120°.

6. The hawk-beak fan blade according to claim 2, characterized in that: The second leading edge line is a straight line.

7. The hawk-beak fan blade according to claim 6, characterized in that: As any point on the first leading edge line gradually approaches the vertex, the angle between the tangent line of the any point and the second leading edge line gradually decreases.

8. The hawk-beak fan blade according to claim 1, characterized in that: The blade body comprises a blade root, which has an inner side fitting the hub and an outer side arranged relative to the inner side. The blade root is formed by a plurality of blade profiles fused from the inner side to the outer side, and the width of the blade profile gradually increases from the outer side to the inner side.

9. A fan, characterized in that: It comprises the hawk-beak fan blade as described in any one of claims 1 to 8.

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