Efficient outer rotor fan impeller

Abstract

The utility model relates to the technical field of fans, and discloses an efficient outer rotor fan impeller which comprises an impeller module, the impeller module comprises a fan blade hub and blades, the fan blade hub is installed on a motor module, and the blades are fixedly installed on the peripheral side of the fan blade hub; the blades are arranged in an inclined mode, the blades are sequentially enlarged from inside to outside, and the outer side edges of the blades are arranged in a flanging mode. According to the utility model, the interaction between the blades and airflow is optimized through the curved-surface blades. In the rotating process of the impeller, airflow can be attached to the surfaces of the blades more smoothly, the airflow separation and turbulence phenomena are reduced, and the acting efficiency of the blades on the airflow is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan technical field, concretely is a kind of high -efficient outer rotor fan impeller. BACKGROUND

[0002] Fan is a kind of general mechanical equipment that converts mechanical energy into gas energy and realizes gas directional delivery, is widely used in industry, building, agriculture, transportation and energy and multiple fields.Such as according to working principle, fan can be divided into volume type, turbine type and jet type;By use, it can be divided into industrial boiler fan, tunnel fan, general exhaust fan and so on;By airflow direction, it can be divided into centrifugal fan, axial fan, mixed flow fan and so on.In industrial field, fan is used for ventilation, dust removal, cooling.

[0003] Now fan's impeller is all for plane setting, is obliquely installed on blade hub, when fan rotates, airflow will produce through blade and produce flow separation, flow separation produced between adjacent two impellers will influence each other, to cause turbulence phenomenon, greatly reduce the efficiency of fan. INVENTION CONTENTS

[0004] To solve the above problems existing in the prior art, the utility model provides a kind of high -efficient outer rotor fan impeller, with the advantages of reducing airflow separation and turbulence phenomenon.

[0005] To realize the above-mentioned purpose of reducing airflow separation and turbulence phenomenon, the utility model provides the following technical scheme: including impeller module, the impeller module includes fan hub and blade, the fan hub is installed on motor module, the blade is fixedly installed on the outer circumferential side of the fan hub;

[0006] The blade is obliquely arranged, the blade gradually increases from inside to outside, and the outer edge of the blade is provided with a flange.

[0007] Preferably, the blade is provided with at least two, which are circumferentially distributed on the outer circumferential side of the fan hub, and the blade is provided with a curved surface, and the flange faces the rear side.

[0008] Preferably, a plurality of grooves are arranged on one side of the curved surface of the blade, and a trailing edge is further arranged on one side of the blade.

[0009] Preferably, the groove is a strip-shaped groove, and the trailing edge is a sawtooth trailing portion.

[0010] Preferably, the sawtooth trailing portion is arranged at the trailing side end surface along the airflow direction, and the size of the sawtooth gradually increases from inside to outside.

[0011] Preferably, the outer end of the blade is provided with a forward side flange, the curved surface of the blade of the forward flange is consistent with the curved surface of the air inlet of the fan, and inclined surfaces are further arranged on both sides of the curved surface.

[0012] Compared with the prior art, the high-efficiency outer rotor fan impeller has the following beneficial effects:

[0013] 1. The high-efficiency outer rotor fan impeller optimizes the interaction between the blade and the airflow through the curved blade. During the rotation of the impeller, the airflow can more smoothly adhere to the surface of the blade, reducing airflow separation and turbulence, and improving the work efficiency of the blade on the airflow.

[0014] 2. The high-efficiency outer rotor fan impeller, through the design of the blade gradually increasing from inside to outside, conforms to the diffusion law of airflow in rotation, makes the airflow flow more naturally, and reduces energy loss.

[0015] 3. The high-efficiency outer rotor fan impeller, through the downward flange of the outer side of the blade, has a good guiding and restraining effect on the airflow. It guides the airflow to flow more concentratedly to the fan outlet, reduces the radial diffusion of the airflow, and improves the air outlet efficiency and airflow directionality. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure is a structure diagram of the impeller module of the utility model;

[0017] Figure 2 The figure is a structure diagram of the groove of the impeller module of the utility model;

[0018] Figure 3 And Figure 4 The figure is a structure diagram of the blade cross section at different diameters of the utility model.

[0019] In the figure: 10, fan hub; 101, blade; 1011, strip-shaped groove; 1012, sawtooth tail. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model. Embodiment 1

[0021] As Figure 1As shown, the fan wheel hub 10 is mounted on the motor module, and the blades 101 are fixedly installed on the outer peripheral side of the fan wheel hub 10. The blades 101 are provided with at least two, which are circumferentially distributed on the outer peripheral side of the fan wheel hub 10. The blades 101 are provided with a curved surface, and the blades 101 gradually increase from inside to outside. The outer side edge of the blade 101 is provided with a flange. The curved blade 101 optimizes the interaction between the blade and the airflow. During the rotation of the impeller, the airflow can more smoothly adhere to the surface of the blade, reducing airflow separation and turbulence, and improving the working efficiency of the blade on the airflow.

[0022] As shown in Figure 3 and 4 As shown, the center of the middle hole of the air guide ring is taken as the center of the circle, and the cylindrical curved surfaces of Φ200, Φ260, Φ320, Φ380 and Φ440 are established, which intersect with the impeller curved surface respectively. As shown in Figure 3 The left point of the line segment is taken as the end point to the right to make a ray, and the included angle between the ray and the line segment is Δ, 10 degrees ≦ Δ ≦ 60 degrees. The length of the line segment is C, 60 ≦ C ≦ 300 mm.

[0023] In the present application, the cross section Δ of the impeller at Φ200 is 23 degrees, and the length C is 83.1 mm. The cross section Δ of the impeller at Φ260 is 21 degrees, and the length C is 98.8 mm. The cross section Δ of the impeller at Φ320 is 20 degrees, and the length C is 119.4 mm. The cross section Δ of the impeller at Φ380 is 19 degrees, and the length C is 141.1 mm. The cross section Δ of the impeller at Φ440 is 18 degrees, and the length C is 157.9 mm.

[0024] The design of the blade gradually increasing from inside to outside conforms to the diffusion law of airflow in rotation, making the airflow flow more naturally and reducing energy loss. This design makes the ventilation efficiency of the fan increase by 15%-10% compared with the traditional impeller, while meeting the ventilation demand, effectively reducing energy consumption, achieving the dual goals of energy saving and high efficiency. The downward flange on the outer side of the blade has a good guiding and restraining effect on the airflow. It guides the airflow to flow more concentratedly to the outlet of the fan, reduces the radial diffusion of the airflow, and improves the outflow efficiency and airflow directionality.

[0025] A plurality of strip-shaped grooves 1011 are arranged on one side of the blade 101, and a sawtooth tail 1012 is arranged on the one side of the blade 101. A single strip distribution track extends from the outer side of the blade leading edge to the inner side of the blade trailing edge. As shown in Figure 2 The center distance of the groove is D, which is in the range of 5-30 mm. The interval is F, which is in the range of 2-15 mm. The shock absorption groove width is E, which is in the range of 8-80 mm. D, E and F are fixed values, and D=E+F. The shock absorption groove width E of the blade 101 of the present application is 7 mm, the interval F is 5 mm, the center distance D is 12 mm, and the depth is 1 mm.

[0026] The noise reduction groove on the back of the impeller cooperates with the sawtooth design of the blade tail edge to greatly reduce the noise of the fan operation. The noise reduction groove disrupts the airflow on the back of the impeller, destroys the formation of large-scale vortex, and reduces the noise generated when the vortex breaks away. The sawtooth of the blade tail edge cuts the airflow separated from the surface of the blade into small streams of airflow, dispersing the energy when the airflow separates, further reducing the noise. Embodiment 2

[0027] The outer end of the blade 101 can also be provided with an upwardly turned edge, the curved surface of the upwardly turned blade 101 being consistent with the curved surface of the fan air inlet, and the two sides of the curved surface being provided with inclined surfaces, which can cut the airflow at the air inlet, disperse the inlet airflow, and be more easily sucked into the fan, thereby increasing the air intake of the fan and increasing the efficiency of the fan.

[0028] In summary, the high-efficiency outer rotor fan impeller optimizes the interaction between the blade and the airflow through the curved blade 101. During the rotation of the impeller, the airflow can more smoothly adhere to the surface of the blade, reducing airflow separation and turbulence, and improving the efficiency of the blade on the airflow; the blade design gradually increasing from the inside to the outside conforms to the diffusion law of the airflow in rotation, making the airflow flow more naturally and reducing energy loss; the downwardly turned edge on the outer side of the blade has a good guiding and restraining effect on the airflow. It guides the airflow to flow more concentratedly to the fan outlet, reduces the radial diffusion of the airflow, and improves the outflow efficiency and airflow directionality.

[0029] It should be noted that, in the present text, relational terms such as first and second and the like are used merely to distinguish one entity or action from another, without necessarily requiring or implying any actual such relationship or order between or among the entities or actions. Also, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0030] Although embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency outer-rotor fan impeller comprising an impeller module, characterized in that: the impeller module comprises a fan hub (10) and blades (101), the fan hub (10) is mounted on a motor module, and the blades (101) are fixedly mounted on the outer circumferential side of the fan hub (10); the blades (101) are arranged obliquely, the blades (101) gradually increase from inside to outside, and the outer side edges of the blades (101) are provided with flanges.

2. A high efficiency outer rotor fan impeller according to claim 1, characterized in that: The blades (101) are provided with at least two, which are circumferentially distributed on the outer circumferential side of the fan hub (10), the blades (101) are provided with curved surfaces, and the flanges thereof face the rear side.

3. A high efficiency outer rotor fan impeller according to claim 2, characterized in that: A plurality of grooves are arranged on one side curved surface of the blade (101), and a tail edge is further arranged on one side surface of the blade (101).

4. A high efficiency outer rotor fan impeller according to claim 3, characterized in that: The grooves are strip-shaped grooves (1011), and the tail edge is a sawtooth tail (1012).

5. A high efficiency outer rotor fan impeller according to claim 4, characterized in that: The sawtooth tail (1012) is arranged on the tail side end surface along the air flow direction, and the size of the sawtooth increases from inside to outside.

6. A high efficiency outer rotor fan impeller according to claim 1, wherein: The outer end of the blade (101) is provided with a flange towards the front side, the curved surface of the blade (101) with the flange towards the front side is consistent with the curved surface of the fan air inlet, and inclined surfaces are further arranged on both sides of the curved surface.

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