Fan blade structure of electric fan

Abstract

A fan blade structure of an electric fan comprises a hub and blades annularly distributed on the peripheral side of the hub, the tail portions of the blades are bent upwards to form folded edges, the upward bending angle of the folded edges is a, and a ranges from 2 degrees to 15 degrees. The blades comprise windward areas and wind gathering areas, the windward areas are located on the inner sides of the blades, the wind gathering areas are located on the outer sides of the blades, and the folded edges are located on the outer sides of the wind gathering areas. According to the fan blade structure of the electric fan, the tails of the blades are bent upwards to form the folded edges, and the upward bending angle of the folded edges is 2-15 degrees, so that the air resistance of the blades can be reduced when the fan blades rotate, the rotating speed of the fan blades is further increased, the air speed of the electric fan can be increased, and the air volume of the electric fan is increased; in addition, the air gathering area is obliquely arranged upwards relative to the blades, the inclination angle of the air gathering area ranges from 2 degrees to 10 degrees, the air resistance of the blades during rotation of the fan blades is further reduced, meanwhile, air flow gathering is effectively achieved, and the air supply effect of the fan blades is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric fans, and particularly relates to a blade structure of an electric fan. Background Art

[0002] Chinese Patent Document No. CN110836200A discloses a fan blade for a cooling fan on February 25, 2020, which includes an insertion ring into which a drive shaft can be inserted; three fan blades are evenly distributed outside the insertion ring; a flow guiding component is arranged on the fan blade; the flow guiding component includes a flow guiding groove on the fan blade, and the flow guiding groove extends from the insertion ring end to the exposed end of the fan blade. The blade of this electric fan is a flat structure as a whole, and when the fan blade rotates, the air resistance of the blade is large, which will affect the rotation speed of the fan blade, resulting in a small wind speed of the electric fan, and further a small air volume of the electric fan.

[0003] Therefore, it is necessary to make further improvements. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a blade structure of an electric fan with simple structure, small blade wind resistance, large wind speed, large air volume and strong practicability, so as to overcome the deficiencies of the prior art.

[0005] A blade structure of an electric fan designed according to this purpose includes a hub and blades annularly distributed on the periphery of the hub, and is characterized in that: the tail of the blade is bent upward to form a folded edge, and the angle of the folded edge bent upward is a, and a = 2° to 15°.

[0006] The blade includes a windward area and a wind gathering area. The windward area is located inside the blade, the wind gathering area is located outside the blade, and the folded edge is located outside the wind gathering area.

[0007] The wind gathering area is inclined upward relative to the blade, and the inclination angle is b, and b = 2° to 10°.

[0008] The windward area is inclined upward relative to the hub, and the inclination angle is c, and c = 3° to 20°.

[0009] The outer end of the folded edge extends along the tangential direction of the fan blade to form an extended tip.

[0010] The folded edge is twisted while being bent upward.

[0011] The length of the blade is D1, and the length of the folded edge is D2, and D1:D2 = 3 to 7:1.

[0012] A wind guiding edge is arranged on one side of the blade, and a windward edge and a wind gathering edge are arranged on the other side of the blade. The wind guiding edge, the windward edge and the wind gathering edge are respectively curved in an arc shape and bent in the opposite direction of the windward direction. An air inlet area is formed between the windward edge and the wind guiding edge, and an air gathering area is formed between the wind gathering edge and the wind guiding edge.

[0013] The transition between the windward edge and the wind-gathering edge, and between the wind-gathering edge and the wind-guiding edge is achieved through rounded corners.

[0014] The length of the windward area is D3, and the length of the wind-gathering area is D4, where D3:D4 = 1.5 - 4:1.

[0015] In the fan blade structure of the present utility model, by bending the tail of the blade upwards to form a folded edge, and the upward bending angle of the folded edge is 2° - 15°, the air resistance of the blade during the rotation of the fan blade can be reduced, thereby increasing the rotational speed of the fan blade, increasing the wind speed of the electric fan, and thus increasing the air volume of the electric fan. In addition, by setting the wind-gathering area to be inclined upwards relative to the blade, and the inclination angle is 2° - 10°, the air resistance of the blade during the rotation of the fan blade is further reduced, and at the same time, the airflow convergence is effectively achieved, thereby improving the air supply effect of the fan blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the fan blade in an embodiment of the present utility model.

[0017] Figure 2 It is a front view of the fan blade in an embodiment of the present utility model.

[0018] Figure 3 It is a cross-sectional view of the fan blade in an embodiment of the present utility model.

[0019] Figure 4 It is a top view of the fan blade in an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0021] See Figures 1-4 , the fan blade structure of this electric fan includes a hub 1 and blades 2 annularly distributed on the periphery of the hub 1. The blades 2 are in the shape of a paddle, and the number of blades 2 is 3. The tail of the blade 2 is bent upwards to form a folded edge 3, and the upward bending angle of the folded edge 3 is a, where a = 2° - 15°. In this embodiment, the upward bending angle a of the folded edge 3 is 3°, 6°, 10° or 13°, which can reduce the air resistance of the blade 2 during the rotation of the fan blade, thereby increasing the rotational speed of the fan blade. Compared with the traditional electric fan blade, the rotational speed of the fan blade is faster under the same power of the motor.

[0022] The blade 2 includes a windward area 4 and a wind-gathering area 5. The windward area 4 is located inside the blade 2, the wind-gathering area 5 is located outside the blade 2, the folded edge 3 is located outside the wind-gathering area 5, and the windward area 4 is connected to the hub 1.

[0023] The air-gathering area 5 is inclined upward relative to the blade 2, and the inclination angle is b, where b = 2° to 10°. In this embodiment, the upward inclination angle b of the air-gathering area 5 is 3°, 5°, 7° or 9°, which further reduces the air resistance of the blade 2 during the rotation of the fan blade. In addition, it makes the airflow direction generated by the air-gathering area 5 inclined towards the center of the fan blade, effectively realizing the convergence of the airflow, avoiding the outward dispersion of the airflow, and thus improving the air supply effect of the fan blade.

[0024] The windward area 4 is inclined upward relative to the hub 1, and the inclination angle is c, where c = 3° to 20°. In this embodiment, the upward inclination angle c of the windward area 4 relative to the hub 1 is 5°, 10°, 15° or 18°, which can make the airflow blow out in a spiral manner as a whole, with uniform wind force, effectively improving the air supply volume, realizing super strong air gathering, and avoiding the noise generated by gas collision.

[0025] The outer end of the hem 3 extends along the tangential direction of the fan blade to form an extended tip 6, which can further reduce the air resistance of the blade 2 and at the same time increase the range of the blade 2 stirring the air.

[0026] While the hem 3 is bent upward, it is twisted, making the air supply more concentrated and the air gathering force stronger.

[0027] The length of the blade 2 is D1, and the length of the hem 3 is D2, where D1:D2 = 3 to 7:1. In this embodiment, D1:D2 = 4:1 or 6:1. Such a reasonable ratio can reduce the air resistance of the blade 2 while ensuring the air supply direction of the fan blade.

[0028] A wind guiding edge 7 is provided on one side of the blade 2, and a windward edge 8 and an air-gathering edge 9 are provided on the other side of the blade 2. The wind guiding edge 7, the windward edge 8 and the air-gathering edge 9 are respectively curved in an arc shape and bent in the opposite direction of the windward direction. An air-gathering area 4 is formed between the windward edge 8 and the wind guiding edge 7, and an air-gathering area 5 is formed between the air-gathering edge 9 and the wind guiding edge 7.

[0029] The windward area 4 gradually becomes larger from the inside to the outside, and the air-gathering area 5 gradually becomes smaller from the inside to the outside. The position between the windward area 4 and the air-gathering area 5 is the maximum position of the blade 2, where the air volume generated is the largest. And this position effectively separates the windward area 4 and the air-gathering area 5, ensuring that a cylindrical airflow vortex is formed inside when the windward area 4 supplies air, ensuring that the air volume is large enough, while a conical airflow vortex is formed outside when the air-gathering area 5 supplies air, forming a protective layer for the inner cylindrical airflow vortex and ensuring the stability and concentration of the air supply effect.

[0030] The windward edge 8 and the air-gathering edge 9, and the air-gathering edge 9 and the wind guiding edge 7 are transitioned by rounded corners, effectively avoiding the noise generated when the fan blade works.

[0031] The length of the windward area 4 is D3, and the length of the wind-accumulating area 5 is D4, where D3:D4 = 1.5 to 4:1. In this embodiment, D3:D4 = 2:1 or 3:1.

[0032] The cross-sections of the windward area 4 and the wind-accumulating area 5 are arc-shaped.

[0033] The fan blade diameter of this electric fan is 850mm, 750mm, 650mm, 600mm, 500mm, 450mm, 400mm, 350mm, 300mm or 250mm.

[0034] The above is the preferred solution of the present utility model, which shows and describes the basic principle, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. The blade structure of an electric fan, comprising a hub (1) and blades (2) annularly distributed on the circumferential side of the hub (1), characterized in that: The tail of the blade (2) is bent upward to form a hem (3), and the upward bending angle of the hem (3) is a, where a = 2° to 15°.

2. The blade structure of the electric fan according to claim 1, wherein: The blade (2) includes a windward area (4) and a wind-gathering area (5). The windward area (4) is located inside the blade (2), the wind-gathering area (5) is located outside the blade (2), and the hem (3) is located outside the wind-gathering area (5).

3. The blade structure of the electric fan according to claim 2, characterized in that: The wind-gathering area (5) is inclined upward relative to the blade (2), and the inclination angle is b, where b = 2° to 10°.

4. The blade structure of the electric fan according to claim 2, wherein: The windward area (4) is inclined upward relative to the hub (1), and the inclination angle is c, where c = 3° to 20°.

5. The blade structure of the electric fan according to claim 1, characterized in that: The outer end of the hem (3) extends along the tangential direction of the fan blade to form an extended tip (6).

6. The blade structure of the electric fan according to claim 1, characterized in that: The hem (3) is twisted while being bent upward.

7. The blade structure of the electric fan according to claim 1, characterized in that: The length of the blade (2) is D1, and the length of the hem (3) is D2, where D1:D2 = 3 to 7:

1.

8. The blade structure of the electric fan according to claim 2, wherein: A wind guiding edge (7) is provided on one side of the blade (2), and a windward edge (8) and a wind-gathering edge (9) are provided on the other side of the blade (2). The wind guiding edge (7), the windward edge (8), and the wind-gathering edge (9) are respectively curved in an arc shape and bent in the opposite direction of the windward direction. A windward area (4) is formed between the windward edge (8) and the wind guiding edge (7), and a wind-gathering area (5) is formed between the wind-gathering edge (9) and the wind guiding edge (7).

9. The blade structure of the electric fan according to claim 8, characterized in that: A fillet transition is provided between the windward edge (8) and the wind-gathering edge (9), and between the wind-gathering edge (9) and the wind guiding edge (7).

10. The blade structure of the electric fan according to claim 1, wherein: The length of the windward area (4) is D3, and the length of the wind-gathering area (5) is D4, where D3:D4 = 1.5 to 4:1.

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