Fan leaf, fan and fan lamp

Abstract

The application provides a fan blade, a fan and a fan lamp, and belongs to the technical field of household appliances. The fan blade comprises a blade root, a blade tip, a front edge located on the windward side and connecting the blade root and the blade tip, and a back edge located on the leeward side and connecting the blade root and the blade tip. The front edge is arranged in a wave shape from the blade root to the blade tip. The back edge is arranged in an arc shape, and the distance between the front edge and the back edge first increases and then decreases from the blade root to the blade tip. The front edge is arranged in a wave shape from the blade root to the blade tip, so that the fan blade can split the air when rotating, the air supply range of the fan blade is expanded, and the air supply wind pressure per unit area is reduced. The back edge is arranged in an arc shape, so that the appearance of the fan blade is beautified while the performance of the fan blade is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a fan blade, a fan and a fan lamp, and belongs to the technical field of household appliances. BACKGROUND

[0002] At present, with the gradual improvement of people's living standards, the fan lamp with large air volume, large blowing angle and low noise is the urgent demand of people. However, most of the fan lamps on the market have sufficient air volume, but there are phenomena such as small blowing area, concentrated blowing area, periodic noise of "puffing" under the fan lamp, strong air pressure impact and high probability of shaking, which brings poor user experience.

[0003] Therefore, it is necessary to improve the existing fan lamp to solve the above problems. SUMMARY

[0004] The present application relates to a fan blade, a fan and a fan lamp, and belongs to the technical field of household appliances.

[0005] To achieve the above-mentioned purpose, the present application provides a fan blade, which comprises a blade root, a blade tip, a front edge connecting the blade root and the blade tip and located on the windward side, and a back edge connecting the blade root and the blade tip and located on the leeward side. The front edge is arranged in a wave shape from the blade root to the blade tip, and the back edge is arranged in an arc shape, and the distance between the front edge and the back edge increases first and then decreases from the blade root to the blade tip.

[0006] As a further improvement of the present application, the front edge is provided with a convex part protruding away from the back edge, and the convex part is arranged close to the blade root, and the back edge is curved away from the front edge and forms an arc.

[0007] As a further improvement of the present application, the line connecting the blade root and the blade tip is defined as the blade length, the vertex of the convex part is defined as the front edge point, and in the rotating direction of the fan blade, the distance between the front edge point and the back edge is greater than the distance between any point on the front edge and the back edge. The front edge point has a first projection point on the blade length, and the distance between the first projection point and the blade root accounts for 10% to 45% of the length of the blade length.

[0008] As a further improvement of the present application, the front edge is provided with a concave part recessed towards the back edge, and the concave part is connected with the convex part. The connecting point of the convex part and the concave part is defined as the tangent point, which is located between the front edge point and the blade tip. The tangent point has a second projection point on the blade length, and the distance between the second projection point and the blade root accounts for 35% to 60% of the length of the blade length.

[0009] As a further improvement of the present application, the lowest plane of the fan blade when rotating is defined as a rotating plane, and the distance between the leading edge point and the rotating plane is greater than the distance between any point on the leading edge and the rotating plane.

[0010] As a further improvement of the present application, the tip includes a first circular arc, a straight edge, and a second circular arc, the two ends of the straight edge are connected with the first circular arc and the second circular arc respectively, the end of the first circular arc away from the straight edge is connected with the leading edge, and the end of the second circular arc away from the straight edge is connected with the trailing edge.

[0011] As a further improvement of the present application, the radius of the first circular arc is 25-80 mm, and the radius of the second circular arc is 2-10 mm.

[0012] As a further improvement of the present application, in the direction perpendicular to the blade root to the blade tip, the line connecting the leading edge and the trailing edge is defined as a chord line, the length of the chord line is a chord length, and the chord length first increases and then decreases in the direction from the blade root to the blade tip.

[0013] As a further improvement of the present application, the fan blade includes an upper surface and a lower surface connected with the blade root, the blade tip, the leading edge, and the trailing edge, the distance between the upper surface and the lower surface is defined as a thickness, and the thickness of the fan blade first gradually increases and then gradually decreases in the direction from the leading edge to the trailing edge.

[0014] As a further improvement of the present application, the thickness of the fan blade reaches a maximum value in the length of 20-40% of the chord length measured from the leading edge, the ratio of the maximum value of the thickness of the fan blade to the chord length is 1-15%, and the ratio of the thickness of the trailing edge to the chord length is 0.5-3%.

[0015] As a further improvement of the present application, the ratio of the thickness of the fan blade near the blade root to the chord length is 4-20%, and the ratio of the thickness of the fan blade near the blade tip to the chord length is 2-10%.

[0016] To achieve the above-mentioned purpose, the present application provides a fan, which includes a hub and the aforementioned fan blade connected with the hub.

[0017] As a further improvement of the present application, in the direction perpendicular to the blade root to the blade tip, the line connecting the leading edge and the trailing edge of the fan blade is defined as a chord line, the plane of the fan when rotating is defined as a rotating plane, the angle between the chord line and the rotating plane ranges from 21° to 36°, and the angle near the blade tip ranges from 21° to 29°.

[0018] To achieve the above object, the application provides a fan lamp, which comprises a rotating disc and a plurality of fan blades.

[0019] As a further improvement of the application, in a direction perpendicular to the direction from the blade root to the blade tip, a line defined between the leading edge and the trailing edge of the fan blade is a chord line, a plane when the rotating disc rotates is a rotation plane, and an included angle between the chord line and the rotation plane ranges from 21° to 36°, and the included angle near the blade tip ranges from 21° to 29°.

[0020] As a further improvement of the application, the fan blade comprises a mounting portion connected with the rotating disc, the fan blade is folded or unfolded relative to the rotating disc around the mounting portion, when the fan blade is unfolded, a first line is formed between the gravity center of the fan blade and the rotation center of the fan lamp, a second line is formed between the rotation center of the mounting portion and the rotation center of the fan lamp, and an included angle between the first line and the second line ranges from 0° to 18°.

[0021] As a further improvement of the application, a connecting point between the fan blade and the rotating disc is defined as a center point, a distance between the leading edge and the rotation plane is defined as a blade height, the blade height increases first and then decreases from the blade root to the blade tip, a leading edge point is arranged on the leading edge, and the blade height reaches a maximum value at the leading edge point.

[0022] As a further improvement of the application, the leading edge comprises a rapid drop stage and a drop stage which extend from the leading edge point to the blade tip, a line between the blade tip and the center point is defined as a blade length, a projection of the rapid drop stage on the blade length is a first stage, a projection of the drop stage on the blade length is a second stage, a ratio of a distance between any point in the first stage and the center point to the blade length is not more than 60%, and a ratio of a distance between any point in the second stage and the center point to the blade length ranges from 60% to 100%.

[0023] The fan blade of the application can split the air when rotating by setting the leading edge as a wave shape which expands first and then shrinks and expands again from the blade root to the blade tip, so that the air supply range of the fan blade is expanded, and the air supply wind pressure of unit area is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 FIG. 1 is a perspective view of a fan lamp in a first state according to a preferred embodiment of the application.

[0025] Figure 2is a perspective view of the fan lamp in the second state according to a preferred embodiment of the present application.

[0026] Figure 3 is Figure 1 is another perspective view of the fan lamp from another angle.

[0027] Figure 4 is Figure 1 is an enlarged view of a part of the fan lamp.

[0028] Figure 5 is Figure 4 is a perspective view of the fan blade.

[0029] Figure 6 is Figure 5 is a first perspective view of the fan blade from a first angle.

[0030] Figure 7 is Figure 5 is a cross-sectional view of the fan blade along the chord line direction.

[0031] Reference Signs List: 100 - fan lamp, 1 - rotating disc, 11 - guide groove, 12 - mounting hole, 13 - first connecting line, 14 - second connecting line;

[0032] 2 - fan blade, 20 - center point, 21 - mounting portion, 211 - guide member, 22 - blade root, 23 - blade tip, 231 - first circular arc, 232 - second circular arc, 233 - straight edge, 24 - leading edge portion, 241 - leading edge, 242 - convex portion, 243 - leading edge point, 244 - concave portion, 245 - tangent point, 25 - trailing edge portion, 251 - trailing edge, 26 - chord line, 261 - blade length, 27 - upper surface, 28 - lower surface, 29 - maximum thickness, 30 - middle arc line, 31 - maximum curvature, 32 - rotation plane, 321 - blade height, β - mounting angle. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Please refer to Figures 1 to 4As shown, the application discloses a fan lamp 100, which combines a lamp and a fan to meet different needs of people and improve the practicability of the product. Specifically, the fan lamp 100 comprises a hanging bracket fixed to a mounting surface (not shown), a shaft, a rotating disc 1, a lamp assembly (not shown) and a fan blade 2. The shaft is fixedly connected to the hanging bracket at one end and connected to the rotating disc 1 at the other end, so that the rotating disc 1 can rotate around the shaft. The fan blade 2 is rotatably connected to the rotating disc 1 and arranged on the side of the rotating disc 1 close to the shaft, so that the rotating disc 1 can drive the fan blade 2 to rotate synchronously. The lamp assembly is arranged on the side of the rotating disc 1 away from the shaft and can rotate synchronously with the rotating disc 1. Of course, in other embodiments, the lamp assembly can not rotate synchronously with the rotating disc 1, that is, the lamp assembly is fixedly connected to the shaft, and the rotating disc 1 rotates relative to the lamp assembly, which is not limited herein.

[0035] In the embodiment, the specific structure of the lamp assembly, the specific structure of the hanging bracket and the shaft, and the connection mode of the lamp assembly with the rotating disc 1 and / or the shaft can be designed according to the prior art, which will not be described in detail herein. The improvement point of the application lies in the fan blade 2 and the connection mode of the fan blade 2 with the rotating disc 1, and the following description will be made in view of the improvement point.

[0036] The fan lamp 100 is provided with a plurality of fan blades 2 connected to the rotating disc 1, and the plurality of fan blades 2 can be arranged on the rotating disc 1 in a foldable or unfoldable manner. Specifically, the rotating disc 1 is provided with a mounting hole 12, one end of the fan blade 2 is provided with a mounting portion 21 corresponding to the mounting hole 12, the mounting portion 21 extends into the mounting hole 12 and can rotate in the mounting hole 12, so as to realize the rotational connection of the fan blade 2 and the mounting portion 21. When the rotating disc 1 rotates, the end of the fan blade 2 away from the mounting portion 21 moves around the mounting portion 21 towards the direction away from the rotating disc 1 under the action of centrifugal force, so as to realize the unfolding of the fan blade 2. The unfolded fan blade 2 rotates under the driving of the rotating disc 1, so as to realize the blowing of air outside. When the rotating disc 1 stops rotating, the end of the fan blade 2 away from the mounting portion 21 moves around the mounting portion 21 towards the direction close to the rotating disc 1 under the action of inertia, so as to realize the folding of the fan blade 2.

[0037] Preferably, the fan blade 2 further comprises a guide member 211 connected to the mounting portion 21, and the rotating disc 1 is provided with a guide groove 11 corresponding to the guide member 211. When the mounting portion 21 is accommodated in the mounting hole 12, the guide member 211 is accommodated in the guide groove 11. The guide groove 11 is arranged on one side of the mounting hole 12 and is arranged in a circular arc shape. When the fan blade 2 is folded in the rotating disc 1, the guide member 211 abuts against one end of the guide groove 11. When the rotating disc 1 rotates, the fan blade 2 unfolds under the action of centrifugal force. At the same time, the guide member 211 slides from one end of the guide groove 11 to the other end until the guide member 211 abuts against the other end of the guide groove 11, so as to limit the continuous rotation of the fan blade 2 relative to the rotating disc 1, thereby pushing the air to form an air flow to blow outwards.

[0038] In the embodiment, the rotating disc 1 is provided with three fan blades 2, three guide members 211 corresponding to the fan blades 2 and a guide groove 11, and the three fan blades 2 are arranged in a central symmetric manner on the rotating disc 1. Of course, in other embodiments, the rotating disc 1 can also be provided with other number of fan blades 2, such as two, four, five or the like, as long as the fan blades 2 are arranged in a central symmetric manner on the rotating disc 1, which is not limited herein.

[0039] As shown in Figure 1 and Figure 5 , the fan blade 2 comprises a blade root 22, a blade tip 23, a leading edge 241 connecting the blade root 22 and the blade tip 23 and located on the windward side, and a trailing edge 251 connecting the blade root 22 and the blade tip 23 and located on the leeward side. The mounting portion 21 is fixedly connected with the blade root 22 at a certain angle, on the one hand, the fan blade 2 is connected with the rotating disc 1 through the mounting portion 21, and on the other hand, the fan blade 2 is arranged obliquely, so that the air flow can be driven when the fan blade 2 rotates.

[0040] As shown in Figure 3 , in the direction perpendicular to the blade root 22 to the blade tip 23, the line between the leading edge 241 and the trailing edge 251 is defined as the chord line 26, the length of the chord line 26 is the chord length, and in the direction of the blade root 22 to the blade tip 23, the chord length first expands and then shrinks. The plane formed by the rotating disc 1 when rotating is the rotation plane 32. The mounting angle β between the chord line 26 and the rotation plane 32 ranges from 21° to 36°, the mounting angle β between the chord line 26 close to the blade tip 23 and the rotation plane 32 ranges from 21° to 29°, and preferably, the fan blade 2 is quartered in the direction of the blade root 22 to the blade tip 23, and the mounting angle β between the chord line 26 close to the blade tip 23 and the rotation plane 32 ranges from 21° to 29°.

[0041] Specifically, since the fan blade 2 of the present application is assembled in a three-dimensional shape, the rotation plane 32 can also be understood as the lowest plane of the fan blade 2 when rotating, that is, the plane formed by at least part of the trailing edge 251 when rotating. In the embodiment, the fan blade 2 is connected with the rotating disc 1, so that the trailing edge 251 is located on the same plane, and when the fan blade 2 rotates, the plane formed by the trailing edge 251 is the rotation plane 32. When the fan blade 2 is gathered, all the trailing edges 251 also form a plane on the rotation plane 32. Of course, in other embodiments, the trailing edge 251 can also not be located on the same plane, and at this time, the lowest point of the trailing edge 251 when the fan blade 2 rotates forms the rotation plane 32, which is not limited herein.

[0042] The connection point of the fan blade 2 and the rotating disc 1 is defined as the center point 20, and the distance between the leading edge 241 and the rotating plane 32 is the blade height 321. Specifically, the blade height 321 increases first and then decreases from the blade root 22 to the blade tip 23, and the blade height 321 reaches the maximum value at the point on the leading edge 241, i.e., the leading edge point 243. In the embodiment, the blade height 321 increases continuously from the point on the leading edge 241 to the blade root 22, and there is a rapid decrease stage and a decrease stage in the range from the point on the leading edge 241 to the blade tip 23. The line between the blade tip 23 and the center point 20 is defined as the blade length 261, the projection of the rapid decrease stage on the blade length 261 is the first stage, and the projection of the decrease stage on the blade length 261 is the second stage. The first stage and the second stage are connected, the ratio of the distance between any point in the first stage and the center point 20 to the length of the blade length 261 is less than 60%, i.e., the ratio of the distance between the connection point of the first stage and the second stage and the center point 20 to the length of the blade length 261 is 60%; the ratio of the distance between any point in the second stage and the center point 20 to the length of the blade length 261 ranges from 60% to 100%, i.e., the end of the second stage away from the first stage is located at the blade tip 23.

[0043] Of course, in other embodiments, the decrease stage can also include a slow decrease stage and a rapid decrease stage, wherein the slow decrease stage is connected with the rapid decrease stage and the rapid decrease stage, respectively, so that the blade height 321 from the blade root 22 to the blade tip 23 changes in the trend of first increasing, then rapidly decreasing, then slowly decreasing, and finally rapidly decreasing again.

[0044] Please refer to Figure 4 In the case of rotating the rotating disc 1, i.e., the fan blade 2 of the fan lamp 100 is unfolded, the line between the center of gravity of the fan blade 2 and the rotating center of the fan lamp 100 is defined as the first line 13, and the line between the rotating center of the mounting portion 21 and the rotating center of the fan lamp 100 is defined as the second line 14, wherein the included angle between the first line 13 and the second line 14 ranges from 0° to 18°, and in the direction of rotation of the rotating disc 1, the first line 13 is located behind the second line 14.

[0045] Please refer to Figures 5 to 7As shown, the leading edge 241 of the fan blade 2 is arranged in a wavy shape from the blade root 22 to the blade tip 23, the trailing edge 251 is arranged in an arc shape, and the distance between the leading edge 241 and the trailing edge 251 first increases and then decreases from the blade root 22 to the blade tip 23. Specifically, the leading edge 241 includes a convex portion 242 extending from the middle of the leading edge 241 to a direction away from the trailing edge 251, and the convex portion 242 is arranged close to the blade root 22. When the fan blade 2 rotates, the convex portion 242 can split the air flow, so that the air flows along both sides of the convex portion 242, and then forms an air flow under the push of the fan blade 2 and blows outwards, thereby expanding the air supply range of the fan blade 2 and reducing the air supply wind pressure directly below the fan blade 2. The convex portion 242 is arranged at the middle of the leading edge 241 close to the blade root 22, so that the convex portion 242 splits most of the air flow to a side away from the blade root 22, thereby further expanding the air supply range of the fan blade 2.

[0046] Specifically, the connecting point of the fan blade 2 and the rotating disc 1 is the blade root 22 of the fan blade 2, the connecting line between the blade root 22 and the blade tip 23 is the blade length 261, the vertex of the convex portion 242 is defined as the leading edge point 243, that is, in the rotating direction of the fan blade 2, the distance between the leading edge point 243 and the trailing edge 251 is greater than the distance between any point on the leading edge 241 and the trailing edge 251. At the same time, the leading edge point 243 has a first projection point on the blade length 261, and the distance between the first projection point and the blade root 22 accounts for 10% to 45% of the length of the blade length 261. In other words, when the fan blade 2 rotates to supply air, the distance between the leading edge point 243 and the rotating plane 32 is greater than the distance between any point on the leading edge 241 and the rotating plane 32, that is, the leading edge point 243 is located at the highest point of the fan blade 2 and the leading edge point 243 is located at the frontmost end of the windward side of the fan blade 2.

[0047] The leading edge 241 is also provided with a concave portion 244 recessed towards the trailing edge 251, wherein the concave portion 244 is arranged close to the blade tip 23, and one end of the concave portion 244 away from the blade tip 23 is connected to one end of the convex portion 242 away from the blade root 22, so that the leading edge 241 presents a wavy shape. The connecting point of the convex portion 242 and the concave portion 244 is defined as the tangent point 245, that is, the tangent point 245 is located between the leading edge point 243 and the blade tip 23, and the tangent point 245 has a second projection point on the blade length 261, and the distance between the second projection point and the blade root 22 accounts for 35% to 60% of the length of the blade length 261. For example, when the distance between the first projection point and the blade root 22 accounts for 10% of the length of the blade length 261, the ratio of the distance between the second projection point and the blade root 22 to the length of the blade length 261 is not less than 35% and not more than 60%; when the distance between the first projection point and the blade root 22 accounts for 45% of the length of the blade length 261, the ratio of the distance between the second projection point and the blade root 22 to the length of the blade length 261 is greater than 45% and not more than 60%, so that the tangent point 245 can always be located between the leading edge point 243 and the blade tip 23.

[0048] The rear edge 251 is curved and forms an arc shape in a direction away from the front edge 241, specifically, the curve where the rear edge 251 is located has a continuous change in the second derivative in the radial direction of the curve, and the chord length of the fan blade 2 first increases and then decreases in the direction from the blade root 22 to the blade tip 23, and finally sharply shrinks. By such arrangement, on the one hand, the air is divided and the air supply area is expanded, on the other hand, the appearance of the fan blade 2 is beautified.

[0049] The fan blade 2 further comprises a front edge portion 24 arranged on the windward side and a rear edge portion 25 arranged on the leeward side, the rear edge 251 is located on the edge of the rear edge portion 25 away from the fan blade 2, the front edge portion 24 is in a circular arc shape, the front edge 241 is located on the edge of the front edge portion 24 away from the fan blade 2, the angle corresponding to the circular arc of the front edge portion 24 is greater than 90° and less than or equal to 180°, and the ratio of the radius corresponding to the circular arc to the chord length is in the range of 0.25% to 3%. By such arrangement, when the fan blade 2 rotates, the sound of the fan blade 2 cutting the air is reduced, and the noise generated when the fan blade 2 rotates is further reduced.

[0050] The fan blade 2 further comprises an upper surface 27 and a lower surface 28, wherein the upper surface 27 and the lower surface 28 are respectively connected with the blade root 22, the blade tip 23, the front edge 241 and the rear edge 251, and the upper surface 27 is arranged on the side of the fan blade 2 away from the lamp assembly, and the lower surface 28 is arranged on the side of the fan blade 2 close to the lamp assembly. Specifically, the upper surface 27 protrudes outward, and the lower surface 28 is recessed inward. In the rotating process, the air flows under the drive of the lower surface 28 to achieve outward blowing. The distance between the upper surface 27 and the lower surface 28 is defined as the thickness, and the thickness of the fan blade 2 first gradually increases and then gradually decreases in the direction from the front edge 241 to the rear edge 251. In other words, in the direction of the chord length line 26, the thickness first gradually increases and then gradually decreases in the direction from the front edge 241 to the rear edge 251. By such arrangement, a higher pressure difference is generated between the upper and lower surfaces 28 of the fan blade 2 to improve the air supply amount of the fan blade 2.

[0051] Specifically, on the cross section of the fan blade 2 in the direction of the chord length line 26, there is a maximum value of the thickness between the front edge 241 and the rear edge 251. The thickness reaches a maximum value, i.e. the maximum thickness 29, in the length of 20% to 40% of the chord length measured from the front edge 241. The ratio of the maximum thickness 29 to the chord length corresponding to the maximum thickness 29 is in the range of 1% to 15%. The ratio of the thickness of the rear edge portion 25 to the chord length is in the range of 0.5% to 3%. That is, the thickness of the fan blade 2 on the cross section in the direction of the chord length line 26 is not uniform, and has a shape of thin on both sides and thick in the middle. The maximum thickness 29 of the fan blade 2 is arranged close to the front edge 241, and the thickness of the fan blade 2 has a certain ratio relationship with the chord length.

[0052] The thickness-to-chord length ratio of the fan blade 2 near the blade root 22 is in the range of 6% to 20%, and the thickness-to-chord length ratio of the fan blade 2 near the blade tip 23 is in the range of 2% to 10%. Specifically, the fan blade 2 is bisected along the blade root 22 to the blade tip 23, and the thickness-to-chord length ratio of the 1 / 2 fan blade 2 near the blade root 22 along the chord line 26 is in the range of 4% to 20%, and the thickness-to-chord length ratio of the 1 / 2 fan blade 2 near the blade tip 23 along the chord line 26 is in the range of 2% to 10%. In short, the fan blade 2 is divided into two equal-length sections, and the thickness of the section near the blade root 22 is greater than the thickness of the section near the blade tip 23, so that the fan blade 2 can ensure strength and increase air supply while reducing weight.

[0053] In the extension direction of the chord line 26, the connecting line of the centers of the multiple inscribed circles in the cross section of the fan blade 2 along the direction is defined as the camber line 30, the maximum distance between the camber line 30 and the chord line 26 is the maximum camber 31, and the distance between the maximum camber 31 and the leading edge 241 in each cross section of the fan blade 2 is in the range of 0.4:1 to 0.5:1, i.e., the distance between the maximum camber 31 and the leading edge 241 accounts for 40% to 50% of the chord length. At the same time, the ratio of the maximum camber 31 to the chord length corresponding to the maximum camber 31 in each cross section of the fan blade 2 is in the range of 6% to 12%, that is, the maximum camber 31 of the fan blade 2 is arranged near the blade root 22 to increase the air supply of the fan blade 2.

[0054] The blade tip 23 of the fan blade 2 further includes a first circular arc 231, a straight edge 233, and a second circular arc 232 connected to each other, the two ends of the straight edge 233 are connected to the first circular arc 231 and the second circular arc 232 respectively, the end of the first circular arc 231 away from the straight edge 233 is connected to the leading edge 241, and the end of the second circular arc 232 away from the straight edge 233 is connected to the trailing edge 251. The radius corresponding to the first circular arc 231 is 25 to 80 mm, and the radius corresponding to the second circular arc 232 is 2 to 10 mm. In this way, the disturbance direction of the airflow at the blade tip 23 is controlled, so that the air can be divided along the first circular arc 231 and the second circular arc 232 when contacting the first circular arc 231 and the second circular arc 232, thereby controlling the direction of the airflow at the blade tip 23. At the same time, the disturbance direction of the airflow is controlled through the first circular arc 231 and the second circular arc 232, thereby reducing the noise generated by the fan blade 2 during rotation.

[0055] In the embodiment, the center of gravity of the fan blade 2 is located in the vicinity of the leading edge portion 24, specifically in the convex portion 242. In this way, the aerodynamic force, centrifugal force, torsion of the expansion spring and the like of the fan blade 2 can be balanced during rotation, thereby enhancing the stability of operation. Specifically, the fan blade 2 of the embodiment and the existing fan blade are tested. In terms of weight, the weight of the fan blade 2 of the embodiment is reduced by about 25%-40% compared with the weight of the existing fan blade. In terms of air supply angle, the air supply wide angle of the fan blade 2 of the embodiment is increased by about 20% compared with the air supply wide angle of the existing fan blade. In terms of air supply volume, the air supply volume of the fan blade 2 of the embodiment is increased by about 10%-20% compared with the air supply volume of the existing fan blade.

[0056] In the embodiment, the fan blade 2 is rotationally connected with the rotating disc 1, and the folding or unfolding of the fan blade 2 is realized by the rotation of the rotating disc 1. Meanwhile, the rotating disc 1 is matched with the lamp assembly to meet the needs of different functions, thereby improving the practicability of the fan lamp 100.

[0057] Of course, in other embodiments, the fan blade 2 can be directly used in a fan (not shown). In this case, the mounting portion 21 and the guide piece 211 are not arranged on the fan blade 2. Specifically, the fan includes a hub (not shown) and the fan blade 2 connected with the hub. The blade root 22 of the fan blade 2 is fixedly connected with the hub at a certain angle. The chord line 26 is defined as a line connecting the leading edge 241 and the trailing edge 251 of the fan blade 2 and being perpendicular to the blade root 22 to the blade tip 23. The plane during rotation of the fan is the rotation plane 32. The mounting angle β between the chord line 26 and the rotation plane 32 ranges from 21° to 36°. The mounting angle β near the blade tip 23 ranges from 21° to 29°. Preferably, the fan blade is equally divided in the direction from the blade root 22 to the blade tip 23. The mounting angle β between the chord line 26 in the range of 1 / 4 near the blade tip 23 and the rotation plane 32 ranges from 21° to 29°. When the fan blade 2 is used in the fan, the center point 20 is the connecting point of the fan blade 2 and the hub. The variation trend of the blade height 321 of the fan blade 2 is the same as that when the fan blade 2 is used in the fan lamp 100, which is not limited here.

[0058] In summary, in the fan blade 2, the leading edge 241 is designed to be wavy, expanding first, then contracting and expanding again from the blade root 22 to the blade tip 23. In this way, the fan blade 2 can split the air during rotation, thereby expanding the air supply range of the fan blade 2 and reducing the air supply wind pressure per unit area. The trailing edge 251 is designed to be arc-shaped, which can improve the performance of the fan blade 2 and beautify the appearance of the fan blade 2. The first circular arc 231 and the second circular arc 232 are arranged at the blade tip 23, which can control the disturbance direction of the airflow at the blade tip 23 and reduce the noise generated by the fan blade 2 during rotation.

[0059] The above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalent replaced without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A fan blade, characterized in that, The fan blade (2) comprises a blade root (22), a blade tip (23), a leading edge (241) connecting the blade root (22) and the blade tip (23) and located on the windward side, and a trailing edge (251) connecting the blade root (22) and the blade tip (23) and located on the leeward side, the leading edge (241) is arranged in a wave shape from the blade root (22) to the blade tip (23), the trailing edge (251) is arranged in an arc shape, and the distance between the leading edge (241) and the trailing edge (251) first increases and then decreases from the blade root (22) to the blade tip (23); the leading edge (241) is provided with a convex part (242) protruding in a direction away from the trailing edge (251), and the convex part (242) is arranged close to the blade root (22); a line connecting the blade root (22) and the blade tip (23) is defined as a blade length (261), a vertex of the convex part (242) is a leading edge point (243), the leading edge point (243) has a first projection point on the blade length (261), and the distance between the first projection point and the blade root (22) accounts for 10%-45% of the length of the blade length (261); the leading edge (241) is provided with a concave part (244) recessed toward the trailing edge (251), the concave part (244) is connected with the convex part (242), a connecting point of the convex part (242) and the concave part (244) is defined as a tangent point (245), the tangent point (245) is located between the leading edge point (243) and the blade tip (23), the tangent point (245) has a second projection point on the blade length (261), and the distance between the second projection point and the blade root (22) accounts for 35%-60% of the length of the blade length (261); the blade tip (23) comprises a first circular arc (231), a straight edge (233) and a second circular arc (232), two ends of the straight edge (233) are connected with the first circular arc (231) and the second circular arc (232) respectively, one end of the first circular arc (231) away from the straight edge (233) is connected with the leading edge (241), and one end of the second circular arc (232) away from the straight edge (233) is connected with the trailing edge (251).

2. The leaf according to claim 1, characterized in that: The trailing edge (251) is curved away from the leading edge (241) and forms an arc shape.

3. The leaf according to claim 2, characterized in that: In the rotation direction of the fan blade (2), the distance between the leading edge point (243) and the trailing edge (251) is greater than the distance between any point on the leading edge (241) and the trailing edge (251).

4. The leaf according to claim 3, characterized in that: After the fan blade (2) is assembled, a lowest plane when the fan blade (2) rotates is defined as a rotation plane (32), the distance between the leading edge point (243) and the rotation plane (32) is greater than the distance between any point on the leading edge (241) and the rotation plane (32).

5. The leaf according to claim 1, wherein: The radius of the first circular arc (231) is 25-80 mm, and the radius of the second circular arc (232) is 2-10 mm.

6. The leaf according to claim 1, wherein: In a direction perpendicular to the blade root (22) to the blade tip (23), a line connecting the leading edge (241) and the trailing edge (251) is defined as a chord line (26), a length of the chord line (26) is a chord length, and the chord length first increases and then decreases in the direction from the blade root (22) to the blade tip (23).

7. The leaf according to claim 6, characterized in that: The fan blade (2) comprises an upper surface (27) and a lower surface (28) connected with the blade root (22), the blade tip (23), the leading edge (241) and the trailing edge (251), a distance between the upper surface (27) and the lower surface (28) is defined as a thickness, and the thickness of the fan blade (2) first gradually increases and then gradually decreases in the direction from the leading edge (241) to the trailing edge (251).

8. The leaf according to claim 7, characterized in that: The thickness of the fan blade (2) reaches a maximum value in a length of 20% to 40% of the chord length measured from the leading edge (241), a ratio of the maximum value of the thickness of the fan blade (2) to the chord length corresponding to the thickness ranges from 1% to 15%, and a ratio of the thickness of the trailing edge (251) to the chord length ranges from 0.5% to 3%.

9. The leaf according to claim 7, wherein: A ratio of the thickness of the fan blade (2) near the blade root (22) to the chord length ranges from 4% to 20%, and a ratio of the thickness of the fan blade (2) near the blade tip (23) to the chord length ranges from 2% to 10%.

10. A fan, characterized by The fan blade (2) comprises a hub and the fan blade (2) connected with the hub.

11. The fan of claim 10, wherein: In a direction perpendicular to the blade root (22) to the blade tip (23), a line connecting the leading edge (241) and the trailing edge (251) of the fan blade (2) is defined as a chord line (26), a plane during rotation of the fan is a rotation plane (32), an included angle between the chord line (26) and the rotation plane (32) ranges from 21° to 36°, and an included angle near the blade tip (23) ranges from 21° to 29°.

12. A fan light, characterized in that The fan (1) comprises a rotating disc (1) and a plurality of fan blades (2) as claimed in any one of claims 1 to 9, and the plurality of fan blades (2) are arranged to be foldable or unfoldable on the rotating disc (1).

13. The fan lamp of claim 12, wherein: In a direction perpendicular to the blade root (22) to the blade tip (23), a line connecting the leading edge (241) and the trailing edge (251) of the fan blade (2) is defined as a chord line (26), a plane during rotation of the fan is a rotation plane (32), an included angle between the chord line (26) and the rotation plane (32) ranges from 21° to 36°, and an included angle near the blade tip (23) ranges from 21° to 29°.

14. The fan lamp of claim 12, wherein: The fan blade (2) comprises a mounting portion (21) rotationally connected with the rotating disc (1), the fan blade (2) is folded or unfolded around the mounting portion (21) relative to the rotating disc (1), when the fan blade (2) is unfolded, a first connecting line (13) is formed between the center of gravity of the fan blade (2) and the rotation center of the fan lamp (100), a second connecting line (14) is formed between the rotation center of the mounting portion (21) and the rotation center of the fan lamp (100), and the included angle between the first connecting line (13) and the second connecting line (14) ranges from 0° to 18°.

15. The fan lamp of claim 13, wherein: The connecting point of the fan blade (2) and the rotating disc (1) is defined as a center point (20), the distance between the leading edge (241) and the rotation plane (32) is defined as a blade height (321), the blade height (321) increases first and then decreases from the blade root (22) to the blade tip (23), a leading edge point (243) is arranged on the leading edge (241), and the blade height (321) reaches the maximum at the leading edge point (243).

16. The fan lamp of claim 15, wherein: The leading edge (241) comprises a rapid descending stage and a descending stage extending from the leading edge point (243) to the blade tip (23), a connecting line between the blade tip (23) and the center point (20) is defined as a blade length (261), the projection of the rapid descending stage on the blade length (261) is a first stage, the projection of the descending stage on the blade length (261) is a second stage, the ratio of the distance between any point in the first stage and the center point (20) to the length of the blade length (261) is not greater than 60%, and the ratio of the distance between any point in the second stage and the center point (20) to the length of the blade length (261) ranges from 60% to 100%.

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