Fan blade, fan and range hood

Abstract

The fan blade comprises a blade body and a drainage structure, the blade body is provided with a blade front edge and a blade rear edge, the drainage structure is arranged on the suction surface of the blade body and close to the blade front edge, and the drainage structure comprises a first drainage plate and a second drainage plate. The first drainage plate and the second drainage plate are of a splayed structure in the direction from the blade front edge to the blade rear edge, the drainage structure is provided with a symmetry axis in the direction from the blade front edge to the blade rear edge, and the first drainage plate and the second drainage plate are symmetrically arranged relative to the symmetry axis. The flow guide structure composed of the first flow guide plate and the second flow guide plate is arranged at the blade front edge of the suction surface of the blade, vortex is reduced, fluid entering the impeller is rectified, axial air inlet fluid is changed into uniform radial fluid after flowing through the part, and therefore unstable flowing of the fluid between the adjacent blades is reduced, and the flow guide effect of the impeller is improved. And the fan flow and efficiency are improved.

Description

Technical Field

[0001] The utility model relates to a fan blade, a fan and a range hood. Background Art

[0002] Multi-blade centrifugal fans are the primary power system for range hoods, characterized by high flow and pressure coefficients and low noise. During operation, the impeller of a multi-blade centrifugal fan converts the fluid from axial to radial flow. After entering the impeller, the fluid undergoes acceleration and discharge. A turbulent flow field or significant vortices within the impeller passageway increases flow losses and reduces fan efficiency. Since the flow field is dependent on the blade structure, redesigning the impeller blades is crucial for optimizing product performance and enhancing the user experience.

[0003] Most existing impeller blades use a single arc curve blade design, and a lot of modification work has been done on the single arc curve from the aspects of bionics and parameter optimization. At the same time, some researchers have tried to design characteristic structures on the trailing edge of the blade, such as the common serrated and wavy shapes. By breaking the vortex when the trailing edge blade tip passes over the fluid, it can play a rectifying role and at the same time have a certain suppression on the wake vortex shedding, which greatly improves the efficiency and noise of the fan. However, these works have not fundamentally solved the vortex problem on the suction surface of the blade, and the flow loss caused by the vortex is still large. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defect of unreasonable structure of impeller blades in the prior art, and to provide a fan blade, a fan and a range hood.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A fan blade comprises a blade body and a drainage structure, wherein the blade body has a blade leading edge and a blade trailing edge, the drainage structure is arranged on the suction surface of the blade body and close to the blade leading edge, the drainage structure comprises a first drainage plate and a second drainage plate, the first drainage plate and the second drainage plate are in an eight-shaped structure along the direction from the blade leading edge to the blade trailing edge, the drainage structure has a symmetry axis in the direction from the blade leading edge to the blade trailing edge, and the first drainage plate and the second drainage plate are symmetrically arranged relative to the symmetry axis.

[0007] In this solution, since the flow velocity and static pressure are low at the leading edge of the suction side of the fan blade, vortices are prone to occur here, increasing flow losses. Therefore, a drainage structure consisting of a first guide plate and a second guide plate is provided at the leading edge of the blade on the suction side of the blade, and the first guide plate and the second guide plate are symmetrically arranged with respect to the symmetry axis from the leading edge to the trailing edge of the blade. The drainage structure guides and disturbs the fluid to increase the flow velocity of the low-speed boundary layer, so that vortices are not easily generated at the leading edge of the blade. The eight-shaped drainage structure also rectifies the fluid entering the impeller, so that the axially inlet fluid can be changed into a uniform radial fluid after flowing through this part, thereby reducing the unstable flow of the fluid between adjacent blades and improving the flow rate and efficiency of the fan.

[0008] Preferably, the angles between the first guide plate and the second guide plate and the longitudinal direction of the blade body are both greater than 30° and less than 60°.

[0009] In this solution, the above-mentioned structural setting is adopted to reduce the generation of eddy currents and improve the flow stabilization effect.

[0010] Preferably, the thickness of the first guide plate and the second guide plate are both greater than 1 mm and less than 3 mm.

[0011] In this solution, the above-mentioned structural setting is adopted to reduce the generation of eddy currents and improve the flow stabilization effect.

[0012] Preferably, the height range of the first guide plate and the second guide plate is greater than 3 mm and less than 15 mm.

[0013] In this solution, the above-mentioned structural setting is adopted to reduce the generation of eddy currents and improve the flow stabilization effect.

[0014] Preferably, the length of the first guide plate and the second guide plate are both one-fifth of the width of the blade body.

[0015] In this solution, the above-mentioned structural setting is adopted to reduce the generation of eddy currents and improve the flow stabilization effect.

[0016] Preferably, the cross section of the blade body is a first arc-shaped structure, the outer circumferences of the first guide plate and the second guide plate are both a second arc-shaped structure, and the curvature of the first arc-shaped structure is the same as that of the second arc-shaped structure.

[0017] In this solution, the above-mentioned structural setting is adopted to reduce the generation of eddy currents and improve the flow stabilization effect.

[0018] Preferably, there are multiple drainage structures, and the multiple drainage structures are evenly spaced along the length direction of the blade body.

[0019] In this solution, the above-mentioned structural setting is adopted to reduce the generation of eddy currents and improve the flow stabilization effect.

[0020] Preferably, the distance between adjacent drainage structures is greater than 100 mm and less than 200 mm.

[0021] In this solution, the above-mentioned structural setting is adopted to reduce the generation of eddy currents and improve the flow stabilization effect.

[0022] A fan comprises the fan blade described above.

[0023] A range hood comprises the fan as described above.

[0024] On the basis of conforming to the common sense in this field, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

[0025] The positive progressive effect of the present invention is that: since the flow velocity and static pressure are low at the leading edge of the suction side of the fan blade, vortexes are likely to occur here, increasing flow losses. Therefore, a drainage structure consisting of a first drainage plate and a second drainage plate is provided at the leading edge of the blade on the suction side of the blade, and the first drainage plate and the second drainage plate are symmetrically arranged with respect to the symmetry axis from the leading edge of the blade to the trailing edge of the blade. The drainage structure drains and disturbs the fluid, thereby increasing the flow velocity of the low-speed boundary layer, and vortexes are not easily generated at the leading edge of the blade. The eight-shaped drainage structure also stabilizes and rectifies the fluid entering the impeller, so that the axially inlet fluid can be changed into a uniform radial fluid after flowing through this part, thereby reducing the unstable flow of the fluid between adjacent blades and improving the flow rate and efficiency of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The structure of the fan blade of a preferred embodiment of the utility model is shown as follows Figure 1 .

[0027] Figure 2 for Figure 1 Enlarged view of part A.

[0028] Figure 3 The structure of the fan blade of a preferred embodiment of the utility model is shown as follows Figure 2 .

[0029] Figure 4 for Figure 3 Cross-section along line BB.

[0030] Figure 5 This is a structural diagram of a fan according to a preferred embodiment of the present invention.

[0031] Figure 6This is a structural diagram of a range hood according to a preferred embodiment of the present invention.

[0032] Description of reference numerals:

[0033] Fan blade 1

[0034] Blade body 11

[0035] Drainage structure 12

[0036] First guide plate 121

[0037] Second guide plate 122

[0038] Blade leading edge 13

[0039] Blade trailing edge 14

[0040] Fan 2

[0041] Thickness 10

[0042] Height 20

[0043] Length 30

[0044] Width 100

[0045] 200 in length direction DETAILED DESCRIPTION

[0046] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0047] like Figures 1-4 As shown, this embodiment discloses a fan blade, which includes a blade body 11 and a drainage structure 12. The blade body 11 has a blade leading edge 13 and a blade trailing edge 14. The drainage structure 12 is arranged on the suction surface of the blade body 11 and is arranged close to the blade leading edge 13. The drainage structure 12 includes a first drainage plate 121 and a second drainage plate 122. The first drainage plate 121 and the second drainage plate 122 are in an eight-shaped structure along the direction from the blade leading edge 13 to the blade trailing edge 14. The drainage structure 12 has a symmetry axis in the direction from the blade leading edge 13 to the blade trailing edge 14. The first drainage plate 121 and the second drainage plate 122 are symmetrically arranged relative to the symmetry axis.

[0048] In this embodiment, the side of the fan blade 1 facing air is the leading edge 13, and the side facing air is the trailing edge 14. Because the flow velocity and static pressure are low at the leading edge 13 of the suction side of the fan blade 1, vortices are prone to occur there, increasing flow losses. Therefore, a flow diversion structure 12 consisting of a first flow diversion plate 121 and a second flow diversion plate 122 is provided at the leading edge 13 of the suction side of the blade. The first and second flow diversion plates 121, 122 are symmetrically arranged about an axis of symmetry extending from the leading edge 13 to the trailing edge 14. The flow diversion structure 12 guides and disturbs the fluid, increasing the velocity of the low-speed boundary layer. This makes vortices less likely to occur at the leading edge 13. The figure-eight-shaped flow diversion structure 12 also stabilizes and straightens the fluid entering the impeller, transforming the axially inlet fluid into a uniform radial flow after passing through this portion. This reduces unstable flow between adjacent blades and improves fan flow and efficiency.

[0049] The first guide plate 121 and the second guide plate 122 are fixedly connected to the outer peripheral surface of the blade body 11 .

[0050] Since the first flow guiding plate 121 and the second flow guiding plate 122 are disposed relative to the symmetry axis, the first flow guiding plate 121 and the second flow guiding plate 122 have the same shape and size.

[0051] like Figures 1-4 As shown, in this embodiment, the angle range between the first guide plate 121 and the second guide plate 122 and the longitudinal direction 200 of the blade body 11 is greater than 30° and less than 60°, so as to reduce the generation of eddy currents and improve the rectification effect.

[0052] like Figure 1 and Figure 2 As shown, in this embodiment, the thickness 10 of the first guide plate 121 and the second guide plate 122 is as small as possible compared to the height 20. Preferably, the thickness 10 of the first guide plate 121 and the second guide plate 122 is greater than 1 mm and less than 3 mm, which can effectively suppress and rectify the flow of the shedding vortex wake and significantly improve the fan flow rate and efficiency.

[0053] like Figure 1 and Figure 2 As shown, in this embodiment, the height 20 of the first guide plate 121 and the second guide plate 122 is larger than the thickness 10 to reduce the generation of vortices and improve the flow stabilization effect. Preferably, the height 20 of the first guide plate 121 and the second guide plate 122 is greater than 3 mm and less than 15 mm.

[0054] like Figure 1 and Figure 2As shown, in this embodiment, in order to disturb the fluid, increase the flow velocity of the low-speed boundary layer, and prevent the generation of eddy currents at the leading edge 13 of the blade, the lengths 30 of the first diversion plate 121 and the second diversion plate 122 are both one-fifth of the width 100 of the blade body 11. Preferably, the range of the lengths 30 of the first diversion plate 121 and the second diversion plate 122 is greater than 20 mm and less than 60 mm.

[0055] As Figure 1 and Figure 2 shown, in this embodiment, the number of the diversion structures 12 is multiple, and the multiple diversion structures 12 are uniformly arranged at intervals along the length direction 200 of the blade body 11, so as to reduce the generation of eddy currents and improve the rectification effect.

[0056] As Figure 1 and Figure 2 shown, in this embodiment, the spacing range between adjacent diversion structures 12 is greater than 100 mm and less than 200 mm, so as to reduce the generation of eddy currents and improve the rectification effect.

[0057] As Figure 3 and Figure 4 shown, in this embodiment, the cross-section of the blade body 11 is in a first circular arc structure, and the outer peripheral surfaces of the first diversion plate 121 and the second diversion plate 122 are both in a second circular arc structure, and the radian of the first circular arc structure is the same as that of the second circular arc structure, so as to reduce the generation of eddy currents and improve the rectification effect.

[0058] In the fan blade 1 of the present utility model, the blade design is carried out with a single circular arc curve, and the entire blade circular arc curve is represented by a spline curve. For the flow separation intensity, occurrence position generated on the suction surface of the fluid flow and the design scheme of the wake jet at the trailing edge 14 of the blade, it is modified, and finally the optimal spline curve control equation is determined as y = ax ,

[0059] , , 2 ,

[0058] , Figure 3 , 4 , Figure 4 , 3 , , Figure 6 ,

[0057] , ,

[0060] , Figure 5 +bx 3 -cx 2 +dx, where, -0.0001 < a < -0.00001, 0.001 < b < 0.01, 0.1 < c < 1, 1 < d < 2, and the first circular arc structure of the blade body 11 is obtained according to the above spline curve equation.

[0059] As Figure 5 shown, this embodiment also discloses a fan, and the fan 2 includes the fan blade 1 as described above. Through the diversion structure 12 on the fan blade 1, the fluid entering the impeller is rectified, so that the axially incoming fluid can be changed into a uniform radial fluid after flowing through this part, thereby reducing the unstable flow of the fluid between adjacent blades, improving the flow rate and efficiency of the fan 2, and solving the jet problem at the trailing edge 14 of the blade.

[0060] As Figure 6As shown, this embodiment also discloses a range hood, which includes the fan as described above.

[0061] In the description of this article, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying 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 a limitation on the present invention.

[0062] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of protection of the present invention.

Claims

1. A fan blade, characterized in that: It includes a blade body and a drainage structure, the blade body has a blade leading edge and a blade trailing edge, the drainage structure is arranged on the suction surface of the blade body and close to the blade leading edge, the drainage structure includes a first drainage plate and a second drainage plate, the first drainage plate and the second drainage plate are in an eight-shaped structure along the direction from the blade leading edge to the blade trailing edge, the drainage structure has a symmetry axis in the direction from the blade leading edge to the blade trailing edge, and the first drainage plate and the second drainage plate are symmetrically arranged relative to the symmetry axis.

2. The fan blade according to claim 1, wherein: The included angle range between the first guide plate and the second guide plate and the longitudinal direction of the blade body is greater than 30° and less than 60°.

3. The fan blade according to claim 1, wherein: The thickness of the first guide plate and the second guide plate are both greater than 1 mm and less than 3 mm.

4. The fan blade according to claim 1, wherein: The height range of the first guide plate and the second guide plate is greater than 3 mm and less than 15 mm.

5. The fan blade according to claim 1, wherein: The lengths of the first guide plate and the second guide plate are both one-fifth of the width of the blade body.

6. The fan blade according to claim 1, wherein: The cross section of the blade body is a first arc-shaped structure, the outer circumferences of the first guide plate and the second guide plate are both a second arc-shaped structure, and the curvature of the first arc-shaped structure and the curvature of the second arc-shaped structure are the same.

7. The fan blade according to claim 1, wherein: There are multiple drainage structures, and the multiple drainage structures are evenly spaced along the length direction of the blade body.

8. The fan blade according to claim 7, wherein: The distance between adjacent drainage structures is greater than 100 mm and less than 200 mm.

9. A fan, characterized in that: The wind turbine comprises the wind turbine blade according to any one of claims 1 to 8.

10. A range hood, characterized in that: The range hood includes the fan according to claim 9.

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