Fan blade and air supply equipment

Abstract

The invention provides a fan blade and air supply equipment, and relates to the technical field of air supply equipment. The fan blade comprises a hub; the blades are connected with the peripheral side face of the hub, the blades are annular, and a hollow area is defined by the inner ring faces of the blades, or the hollow area is defined by the inner ring faces of the blades and the peripheral side face of the hub; in the radial direction of the hub, the ends, connected with the hub, of the blades are roots of the blades, and the ends, away from the hub, of the blades are ends of the blades. Wherein in the direction from the end part to the root part, at least part of the area of the blade is a first section part, and the first section part comprises a first inner ring surface and a first outer ring surface; in the axial direction of the hub, the directions of the first inner ring face and the first outer ring face are turned at the end, and the first inner ring face and the first outer ring face on the two sides of the end do not shield each other.

Description

Technical Field

[0001] The present invention relates to the technical field of air supply equipment, and in particular to a fan blade and air supply equipment. Background Art

[0002] In the related art, some fan blades use an annular blade solution to reduce noise.

[0003] However, the structure of the tip of the annular blade is relatively complex and cannot be produced with a mold, or the mold structure is complex and costly, and the produced blades will have structures such as burrs that affect product performance. This results in technical defects such as high process complexity, high process cost, and poor product performance.

[0004] Therefore, how to overcome the above-mentioned technical defects has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0006] To this end, a first aspect of the present invention provides a fan blade.

[0007] A second aspect of the present invention provides an air supply device.

[0008] In view of this, the first aspect of the present invention provides a fan blade, which includes: a hub; a blade connected to the peripheral side surface of the hub, the blade is annular, the inner annular surface of the blade encloses a hollow area, or the inner annular surface of the blade and the peripheral side surface of the hub enclose a hollow area; in the radial direction of the hub, the end of the blade connected to the hub is the root of the blade, and the end away from the hub is the end of the blade; wherein, in the direction from the end to the root, at least a portion of the blade is a first section, and the first section includes a first inner annular surface and a first outer annular surface; in the axial direction of the hub, the first inner annular surface and the first outer annular surface are reversed at the end, and the first inner annular surface and the first outer annular surface on both sides of the end do not block each other.

[0009] In this technical solution, a fan blade is proposed. The fan blade can be used on an air supply device. The rotating fan blade can blow out a directional airflow to supply air to a designated area.

[0010] The fan blades include a hub and blades. The hub is the rotation center of the fan blades, and the blades are installed on the circumference of the hub. During operation, the hub drives the blades to rotate around the axis of the hub itself, so as to blow out a directional airflow through the synchronously rotating blades.

[0011] The blade is annular, and can be a closed annular blade connected to the hub, or an annular blade with an opening connected to the hub through the opening. The blade includes an inner annular surface and an outer annular surface. When the blade is closed, the inner annular surface of the blade encloses a hollow area, and an angle exists between the axis of the hollow area and the axis of the hub. When the blade has an opening, the inner annular surface of the blade cooperates with the peripheral side surface of the hub to enclose a hollow area, and an angle also exists between the hollow area and the axis of the hub.

[0012] Specifically, on the annular blade, the area connected to the hub is the root of the blade, and the end away from the hub in the radial direction of the hub is the end of the blade.

[0013] During the high-speed rotation of the blades, noise reduction can be performed through the enclosed hollow area to reduce the noise generated by the fan blades during the high-speed rotation, thereby realizing the noise reduction design of the fan blades and improving the user experience.

[0014] Specifically, manufacturing annular blades through a casting process can improve production efficiency and reduce production costs, but the structural complexity of the ends of the annular blades is relatively high, so that during the production process, the ends of the annular blades need to be formed through multiple molds with different demolding directions, resulting in increased complexity and cost of the molds. In extreme cases, complex ends cannot be formed through molds. At the same time, when the ends of the blades are formed together through multiple molds, there is inevitably a gap between two adjacent molds, and the gap will form a flash at the end of the blade, which will destroy the aerodynamic properties of the blade, resulting in impaired aerodynamic performance of the blade and increased aerodynamic noise.

[0015] In this regard, on the blade proposed in this application, at least a partial area from the end of the blade to the root of the blade is the first end, that is, the first section must cover the end of the blade, and the first section can be the tip of the blade, the back half of the blade or the entire blade.

[0016] The first section includes a first inner annular surface and a first outer annular surface. When the blade is observed in the axial direction of the hub, the first inner annular surface and the first outer annular surface are reversed in direction by twisting at the end, that is, the end is a boundary area on the first section. For example, the first inner annular surface that was originally observable is turned to the back direction after twisting at the end, and the first outer annular surface that was originally unobservable is turned to the forward direction that can be observed after twisting at the end, or the first outer annular surface that was originally observable is turned to the back direction after twisting at the end, and the first inner annular surface that was originally unobservable is turned to the forward direction that can be observed after twisting at the end.

[0017] On this basis, the first outer ring surface and the first inner ring surface on both sides of the end do not block each other. For example, the first section exposes the first outer ring surface before turning, and the first inner ring surface after turning will not block the first outer ring surface. Similarly, the first outer ring surface before turning will not block the first inner ring surface after turning, and vice versa.

[0018] By setting the above-mentioned first sections that do not block each other, the first section can be formed by two molds, and the demolding directions of the two molds correspond to the two directions of the axis of the hub, that is, one mold is demolded from the front to form the first inner ring surface and the first outer ring surface that can be observed from the front, and the other mold is demolded from the back to form the first inner ring surface and the first outer ring surface that cannot be observed, thereby reducing the number of molds for molding the first section, and the end portion corresponds to the parting line between the two molds, that is, the structure of the first side of the end portion is formed by one of the molds, and the structure of the other side is formed by the other mold.

[0019] It can be seen that the blade proposed in this application can reduce the number of molds by optimizing the structure of the tip, thereby reducing the complexity and cost of the mold, making the blade suitable for the mold one-piece molding process. At the same time, reducing the number of molds can reduce the possibility of burrs on the blade, thereby improving the aerodynamic performance of the blade and reducing the aerodynamic noise of the blade to solve the technical defects existing in the relevant technology.

[0020] This will achieve the technical effects of optimizing blade structure, reducing blade process complexity, reducing blade production costs, and improving blade product performance.

[0021] Specifically, the front side of the fan blade corresponds to the front side of the hub, and the back side of the fan blade corresponds to the back side of the hub. The back side of the hub has a blind hole for inserting the rotating shaft, and the rotating shaft is inserted into the fan blade through the back side of the fan blade.

[0022] In addition, the fan blade provided by the present invention may also have the following additional technical features:

[0023] In some technical solutions of the present invention, optionally, in the radial direction of the hub, the distance between the end and the axis of the hub is the outer diameter d0 of the blade; in the radial direction of the hub, the length of the first section is d1; wherein d0 and d1 satisfy the following relationship:

[0024] 0.01×d0≤d1≤0.2×d0.

[0025] In this technical solution, the area of ​​the first section is defined. Specifically, in the radial direction of the hub, the distance between the end and the axis of the hub is the outer diameter d0 of the blade, which is the sum of the radius of the hub and the length of the blade.

[0026] Correspondingly, in the radial direction of the hub, the length of the first section is d1, that is, the distance extending from the end to the root. The larger d1 is, the higher the coverage ratio of the first section is, and the smaller d1 is, the smaller the coverage ratio of the first section is.

[0027] On this basis, d0 and d1 satisfy the relationship: 0.01×d0≤d1≤0.2×d0.

[0028] By limiting the above-mentioned dimensional relationship, on the one hand, it can be ensured that the length of the first section can meet the noise reduction requirements of the blade and ensure the noise reduction performance of the blade. On the other hand, it can avoid that the excessively long first section affects other inherent properties of the blade, broaden the scope of application of the blade, and enable the blade to take into account multiple aerodynamic advantages.

[0029] At the same time, by limiting d1≤0.2×d0, it can also provide convenient conditions for the miniaturization and lightweight design of the fan blades.

[0030] In some technical solutions of the present invention, optionally, the blade also includes a second section, the second section includes a second inner annular surface and a second outer annular surface; the blade also includes a third section, the third section includes a third inner annular surface and a third outer annular surface; the first section connects the second section and the third section; wherein, in the axial direction of the hub, the second inner annular surface and the first inner annular surface are not blocked, the third outer annular surface and the first outer annular surface are not blocked, or the third inner annular surface and the first inner annular surface are not blocked, and the second outer annular surface and the first outer annular surface are not blocked.

[0031] In this technical solution, the blade also includes a second section and a third section, and the second section and the third section are respectively connected to the two sides of the first section, that is, the first section transitionally connects the second section and the third section, and the second section and the third section are symmetrical with respect to the fractal line on the first section.

[0032] On this basis, the second section includes a second inner annular surface and a second outer annular surface, and the third section includes a third inner annular surface and a third outer annular surface. When the fan blade is observed in the axial direction of the hub, the surface of the first section that is connected to the second section is the first outer annular surface, then the second outer annular surface on the second section is exposed together with the first outer annular surface, and the second outer annular surface is not blocked, and the corresponding third inner annular surface on the third section is exposed together with the first inner annular surface on the other side of the end, and the third inner annular surface is not blocked, and vice versa.

[0033] By defining the second section and the third section, two air induction sections can be formed on the basis of the first section. The two air induction sections are used to guide the direction of the airflow, on the one hand to ensure that the air supply direction and air supply intensity meet the requirements, and on the other hand to cooperate with the first section to reduce the aerodynamic noise of the fan blade. At the same time, by defining the above-mentioned exposure relationship, the first section, the second section and the third section can be formed simultaneously with two molds to reduce the process complexity of the fan blade, reduce the mold cost, and thus improve the market competitiveness of the fan blade.

[0034] In some technical solutions of the present invention, optionally, in the radial direction of the hub, the distance between the end and the axis of the hub is the outer diameter d0 of the blade; in the radial direction of the hub, the length of the second section is d2; wherein d0 and d2 satisfy the following relationship:

[0035] 0<d2<0.1×d0.

[0036] In this technical solution, the area of ​​the second section is defined. Specifically, in the radial direction of the hub, the distance between the end and the axis of the hub is the outer diameter d0 of the blade, which is the sum of the radius of the hub and the length of the blade.

[0037] Correspondingly, in the radial direction of the hub, the length of the second section is d2, that is, the distance extending from the end to the root. The larger d2 is, the higher the coverage ratio of the second section is, and the smaller d2 is, the smaller the coverage ratio of the second section is.

[0038] On this basis, d0 and d2 satisfy the relationship: 0<d2<0.1×d0.

[0039] By limiting the above-mentioned dimensional relationship, it is possible to avoid the excessive length of the second section affecting other inherent properties of the blade while meeting the airflow guidance requirements through the second section and the third section, thereby broadening the application scope of the blade and allowing the blade to take into account multiple aerodynamic advantages.

[0040] At the same time, by limiting d2<0.1×d0, it can also provide convenient conditions for the miniaturization and lightweight design of the fan blades.

[0041] In some technical solutions of the present invention, optionally, the fan blade is configured to rotate around a first rotation direction; in the first rotation direction, the third outer annular surface is located in front of the second inner annular surface.

[0042] In this technical solution, the calibrated rotation direction of the fan blade is a first rotation direction, and the rotation direction during actual use may be the same as the calibrated rotation direction or may be opposite to the calibrated rotation direction.

[0043] On this basis, in the first rotation direction, the third outer annular surface is located in front of the second inner annular surface, and correspondingly, the third inner annular surface is located in front of the second outer annular surface. During the rotation of the fan blade in the first rotation direction, the third outer annular surface and the second outer annular surface are the windward side, and the second outer annular surface and the third inner annular surface are the leeward side. In addition, in the axial direction of the hub, the second section and the third section are staggered, the third section is close to the front of the hub, and the second section is close to the back of the hub.

[0044] By limiting the position of the second section and the third section and the relationship between the calibrated rotation directions, the noise reduction performance of the blade can be optimized, and the noise reduction effect of the blade during high-speed rotation can be optimized, thereby improving the user experience.

[0045] In some technical solutions of the present invention, optionally, at least a portion of the first inner annular surface near the end extends in the axial direction of the hub; and / or at least a portion of the first outer annular surface near the end extends in the axial direction of the hub.

[0046] In this technical solution, at least part of the first inner annular surface near the end can extend in the axial direction of the hub. When the fan blade is observed axially from the hub, at least part of the points on the first inner annular surface overlap into a line, that is, at least part of the area on the first inner annular surface is obscured by itself.

[0047] Correspondingly, at least part of the first outer annular surface near the end can also extend in the axial direction of the hub. When the fan blade is observed axially from the hub, at least part of the points on the first outer annular surface overlap into a line, that is, at least part of the area on the first outer annular surface is obscured by itself.

[0048] By limiting the above-mentioned features, the sharpness and torsion amplitude of the blade end can be reduced without increasing the number of molds and the complexity of the mold structure, thereby optimizing the aerodynamic performance of the blade and enabling the blade to meet the air supply and noise reduction requirements of the fan blade.

[0049] In some technical solutions of the present invention, optionally, in the circumferential direction of the hub, the size of the hollow area is L2; ​​wherein L2>5 mm.

[0050] In this technical solution, in the circumferential direction of the hub, the size of the hollow area enclosed by the inner annular surface of the blade is L2. When the fan blade is observed from the axial direction of the hub, L2 is the length of the arc segment in the hollow area with the axis of the hub as the axis. The size of L2 affects the width of the hollow area.

[0051] On this basis, L2 needs to be greater than 5mm. By limiting the above-mentioned size range, it can be ensured that the inner side of the blade has a sufficiently wide hollow area to ensure the noise reduction performance of the blade during high-speed rotation, thereby achieving the technical effect of reducing the aerodynamic noise of the fan blade and improving the user experience.

[0052] In some technical solutions of the present invention, optionally, in the circumferential direction of the hub, the size of the first section is L1; and in the direction from the root to the end, L1 gradually decreases.

[0053] In this technical solution, in the circumferential direction of the hub, the size of the first section is L1. When the fan blade is observed from the axial direction of the hub, L1 is the length of the arc segment connecting the outer contour lines on both sides of the first section, and the arc segment has the axis of the hub as the axis. The size of L1 affects the width of the first section.

[0054] On this basis, L1 gradually decreases in the direction from the root of the blade to the end of the blade, that is, the width of the first section gradually locks in the direction away from the hub, and the first section is sharp. By limiting the shape of the first section, the noise reduction performance of the blade during high-speed rotation can be guaranteed, thereby achieving the technical effect of reducing the aerodynamic noise of the fan blade and improving the user experience.

[0055] In some technical solutions of the present invention, optionally, the blade is cut off by an annular surface with the axis of the hub as the axis to obtain a cross section of the blade; the outer contour of the cross section includes a convex first smooth curve and a concave second smooth curve.

[0056] In this technical solution, the shape of the blade is defined. Specifically, any area on the blade is intercepted by a ring surface with the axis of the hub as the axis to obtain a cross section of the blade. The outer contour of the cross section of the blade includes a first convex smooth curve and a second concave smooth curve, and the first smooth curve and the second smooth curve are buckled to form the outer contour of the cross section of the blade.

[0057] By limiting the above-mentioned cross-sectional shape, the blade maintains a twisting trend throughout the entire section. Taking the case where both ends of the blade are connected to the peripheral side surface of the hub as an example, the first end of the blade begins to expose the outer annular surface first. In the direction from the first end to the end of the blade, the blade changes the exposed area of ​​the outer annular surface by twisting, until the inner and outer annular surfaces are reversed after twisting to the end, and the inner annular surface begins to be exposed. In the direction from the end to the second end of the blade, the exposed area of ​​the inner annular surface also changes along with the twisting trend, and vice versa, that is, the strip-shaped blade continues to twist during the circling process.

[0058] By limiting the cross-sectional shape of the above-mentioned blades, it is possible to avoid the appearance of shape mutation points on the blades, thereby ensuring the noise reduction performance of the blades during high-speed rotation, thereby achieving the technical effect of reducing the aerodynamic noise of the fan blades and improving the user experience, and on the other hand reducing the resistance of the blades and improving the energy efficiency ratio of the air supply equipment.

[0059] In some technical solutions of the present invention, optionally, the fan blade is configured to rotate around a first rotation direction; in the first rotation direction, the second smooth curve is located in front of the first smooth curve.

[0060] In this technical solution, the calibrated rotation direction of the fan blade is a first rotation direction, and the rotation direction during actual use may be the same as the calibrated rotation direction or may be opposite to the calibrated rotation direction.

[0061] On this basis, in the first rotation direction, the second smooth curve is located in front of the first smooth curve. During the rotation of the fan blade according to the calibrated first rotation direction, the first smooth curve corresponds to the pressure side of the blade, and the second smooth curve corresponds to the suction side of the blade.

[0062] By limiting the relationship between the blade shape and the rotational component, the noise reduction performance of the blade can be optimized, and the noise reduction effect of the blade during high-speed rotation can be optimized, thereby improving the user experience.

[0063] In some technical solutions of the present invention, optionally, there are multiple blades; the multiple blades are evenly distributed around the hub.

[0064] In this technical solution, there are multiple blades, and the multiple blades are evenly distributed around the hub and around the axis of the hub, that is, the angles between two adjacent blades in the multiple blades are equal.

[0065] Specifically, the number of blades is greater than or equal to three.

[0066] By providing multiple evenly distributed blades, the air supply intensity and uniformity of the fan blades can be improved without changing the fan blade speed, thereby optimizing the aerodynamic performance of the fan blades and improving the practicality and reliability of the fan blades.

[0067] A second aspect of the present invention provides an air supply device, comprising: a fan blade as in any of the above technical solutions; and a driving component connected to the hub, the driving component being used to drive the fan blade to rotate.

[0068] In this technical solution, an air supply device including the fan blades in any of the above technical solutions is defined, and the air supply device includes: a floor fan, a cooling fan, an exhaust fan, etc. Therefore, the air supply device has the advantages of the fan blades in any of the above technical solutions, and can achieve the technical effects that can be achieved by the fan blades in any of the above technical solutions. To avoid repetition, it will not be repeated here.

[0069] On this basis, the air supply device also includes a driving component, which is connected to the hub on the fan blade. After power is turned on, the driving component is used to drive the hub and the blade to rotate synchronously.

[0070] Specifically, the driving component includes a motor, and a rotating shaft on the motor is inserted into the hub to drive the hub and the blades to rotate.

[0071] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0073] Figure 1 A front view of a fan blade according to an embodiment of the present invention is shown;

[0074] Figure 2 A front view of a fan blade according to an embodiment of the present invention is shown;

[0075] Figure 3 A rear view of a fan blade according to an embodiment of the present invention is shown;

[0076] Figure 4 A front view of a fan blade according to an embodiment of the present invention is shown;

[0077] Figure 5 A schematic diagram of the structure of a fan blade according to an embodiment of the present invention is shown;

[0078] Figure 6 A schematic diagram showing the structure of a first section according to an embodiment of the present invention is shown;

[0079] Figure 7 A front view of a fan blade according to an embodiment of the present invention is shown;

[0080] Figure 8 A rear view of a fan blade according to an embodiment of the present invention is shown;

[0081] Fig. 9 A schematic diagram of the structure of a fan blade according to an embodiment of the present invention is shown;

[0082] Fig.10 for Fig. 9 A partial enlarged view of the fan blade in area A in the embodiment shown;

[0083] Fig.11 A schematic diagram of the structure of a fan blade according to an embodiment of the present invention is shown;

[0084] Fig.12 for Fig.11 A partial enlarged view of the fan blade in area B in the embodiment shown;

[0085] Fig.13 A front view of a fan blade according to an embodiment of the present invention is shown;

[0086] Fig.14 A schematic diagram of the structure of a fan blade according to an embodiment of the present invention is shown;

[0087] Fig.15 A schematic diagram showing a cross section of a fan blade according to an embodiment of the present invention;

[0088] Fig.16 A schematic diagram of the structure of a fan blade according to an embodiment of the present invention is shown;

[0089] Fig.17 A schematic diagram of the structure of a fan blade according to an embodiment of the present invention is shown;

[0090] Fig.18 A schematic diagram of the structure of a fan blade according to an embodiment of the present invention is shown;

[0091] Fig.19 A schematic diagram of the structure of a fan blade according to an embodiment of the present invention is shown;

[0092] Fig. 20 A schematic structural diagram of an air supply device according to an embodiment of the present invention is shown.

[0093] in, Figures 1 to 20 The corresponding relationship between the reference numerals and component names in the figure is:

[0094] 100 fan blades, 110 hub, 120 blades, 1202 root, 1204 end, 1206 hollow area, 1208 inner annular surface, 1209 outer annular surface, 122 first section, 1222 first inner annular surface, 1224 first outer annular surface, 124 second section, 1242 second inner annular surface, 1244 second outer annular surface, 126 third section, 1262 third inner annular surface, 1264 third outer annular surface, 128 cross section, 1282 first smooth curve, 1284 second smooth curve, 129 second blade, 130 wind guide ring, 200 air supply equipment, 210 driving component. DETAILED DESCRIPTION

[0095] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0096] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0097] Refer to the following Figures 1 to 20 The fan blades and air supply devices according to some embodiments of the present invention are described.

[0098] like Figure 1 , Figure 2 , Figure 3 , Figure 7 and Figure 8 As shown, an embodiment of the present invention provides a fan blade 100, which includes: a hub 110; a blade 120 connected to the peripheral side of the hub 110, the blade 120 is annular, and the inner annular surface 1208 of the blade 120 encloses a hollow area 1206, or the inner annular surface 1208 of the blade 120 and the peripheral side of the hub 110 enclose a hollow area 1206; in the radial direction of the hub 110, the end of the blade 120 connected to the hub 110 is the root 1202 of the blade 120, away from the hub 110. One end of the hub 110 is the end 1204 of the blade 120; wherein, in the direction from the end 1204 to the root 1202, at least a portion of the blade 120 is the first section 122, and the first section 122 includes a first inner annular surface 1222 and a first outer annular surface 1224; in the axial direction of the hub 110, the first inner annular surface 1222 and the first outer annular surface 1224 are reversed in direction at the end 1204, and the first inner annular surface 1222 and the first outer annular surface 1224 on both sides of the end 1204 do not cover each other.

[0099] Figure 1 A front view of a fan blade 100 according to an embodiment of the present invention is shown.

[0100] Figure 2 FIG. 1 shows a front view of a fan blade 100 according to an embodiment of the present invention. Figure 2 The middle arrow a shows the radial direction of the hub 110 , and the arrow b shows the first rotation direction of the blade 100 .

[0101] Figure 3 A rear view of a fan blade 100 according to one embodiment of the present invention is shown.

[0102] Figure 7 FIG. 1 shows a front view of a fan blade 100 according to an embodiment of the present invention. Figure 7 The middle arrow a shows the radial direction of the hub 110 , and the arrow b shows the first rotation direction of the blade 100 .

[0103] Figure 8 A rear view of a fan blade 100 according to one embodiment of the present invention is shown.

[0104] In this embodiment, a fan blade 100 is proposed. The fan blade 100 can be applied to an air supply device 200. The rotating fan blade 100 can blow out a directional airflow to supply air to a designated area.

[0105] The fan blade 100 includes a hub 110 and blades 120. The hub 110 is the rotation center of the fan blade 100, and the blades 120 are installed on the circumferential side of the hub 110. During operation, the hub 110 drives the blades 120 to rotate around the axis of the hub 110 itself, so as to blow out a directional airflow through the synchronously rotating blades 120.

[0106] The blade 120 is annular, and specifically can be a closed annular blade 120 connected to the hub 110, or can be an annular blade 120 with an opening connected to the hub 110 through the opening. The blade 120 includes an inner annular surface 1208 and an outer annular surface 1209. When the blade 120 is closed, the inner annular surface 1208 of the blade 120 encloses a hollow area 1206, and an angle exists between the axis of the hollow area 1206 and the axis of the hub 110. When the blade 120 has an opening, the inner annular surface 1208 of the blade 120 cooperates with the peripheral side surface of the hub 110 to enclose a hollow area 1206, and an angle also exists between the hollow area 1206 and the axis of the hub 110.

[0107] Specifically, on the annular blade 120 , the area connected to the hub 110 is the root 1202 of the blade 120 , and the end away from the hub 110 in the radial direction of the hub 110 is the end 1204 of the blade 120 .

[0108] During the high-speed rotation of the blade 120, the enclosed hollow area 1206 can be used to reduce noise, so as to reduce the noise generated by the fan blade 100 during the high-speed rotation, thereby realizing the noise reduction design of the fan blade 100 and improving the user experience.

[0109] Specifically, manufacturing the annular blade 120 through a casting molding process can improve production efficiency and reduce production costs, but the end 1204 of the annular blade 120 has a high structural complexity, so that during the production process, the end 1204 of the annular blade 120 needs to be molded by multiple molds with different demolding directions, resulting in increased complexity and cost of the mold. In extreme cases, the complex end 1204 cannot be molded by the mold. At the same time, when the end 1204 of the blade 120 is molded by multiple molds together, there is inevitably a gap between two adjacent molds, and the gap will form a flash at the end 1204 of the blade 120, which will destroy the aerodynamic properties of the blade 120, resulting in impaired aerodynamic performance of the blade 120 and increased aerodynamic noise.

[0110] In this regard, on the blade 120 proposed in the present application, at least a portion of the area from the end 1204 of the blade 120 to the root 1202 of the blade 120 is the first end 1204, that is, the first section 122 must cover the end 1204 of the blade 120, and the first section 122 can be the tip of the blade 120, the rear half of the blade 120, or the entire section of the blade 120.

[0111] The first section 122 includes a first inner annular surface 1222 and a first outer annular surface 1224. When the fan blade 100 is observed in the axial direction of the hub 110, the first inner annular surface 1222 and the first outer annular surface 1224 are reversed in direction by twisting at the end 1204, that is, the end 1204 is a boundary area on the first section 122. For example, the first inner annular surface 1222 that was originally observable is reversed to the reverse direction after the twisting of the end 1204, and the first outer annular surface 1224 that was originally unobservable is reversed to the forward direction that can be observed after the twisting of the end 1204, or the first outer annular surface 1224 that was originally observable is reversed to the reverse direction after the twisting of the end 1204, and the first inner annular surface 1222 that was originally unobservable is reversed to the forward direction that can be observed after the twisting of the end 1204.

[0112] On this basis, the first outer annular surface 1224 and the first inner annular surface 1222 on both sides of the end portion 1204 do not block each other. For example, the first section 122 exposes the first outer annular surface 1224 before being turned around, and the turned first inner annular surface 1222 will not block the first outer annular surface 1224. Similarly, the first outer annular surface 1224 before being turned will not block the turned first inner annular surface 1222, and vice versa.

[0113] By setting the above-mentioned first section 122 that does not block each other, the first section 122 can be formed by two molds, and the demolding directions of the two molds correspond to the two directions of the axis of the hub 110, that is, one mold is demolded from the front to form the first inner ring surface 1222 and the first outer ring surface 1224 that can be observed from the front, and the other mold is demolded from the back to form the first inner ring surface 1222 and the first outer ring surface 1224 that cannot be observed, thereby reducing the number of molds for molding the first section 122, and the end 1204 corresponds to the parting line between the two molds, that is, the structure of the first side of the end 1204 is formed by one of the molds, and the structure of the other side is formed by the other mold.

[0114] It can be seen that the blade 120 proposed in the present application can reduce the number of molds by optimizing the structure of the tip, thereby reducing the complexity and cost of the mold, making the blade 120 suitable for the mold one-piece molding process. At the same time, reducing the number of molds can reduce the possibility of burrs on the blade 120, thereby improving the aerodynamic performance of the blade 120 and reducing the aerodynamic noise of the blade 120, so as to solve the technical defects existing in the related technology.

[0115] This achieves the technical effects of optimizing the structure of the blade 120 , reducing the process complexity of the blade 120 , reducing the production cost of the blade 120 , and improving the product performance of the blade 120 .

[0116] Specifically, the front of the fan blade 100 corresponds to the front of the hub 110 , and the back of the fan blade 100 corresponds to the back of the hub 110 . The back of the hub 110 has a blind hole for plugging in the rotating shaft, and the rotating shaft is inserted into the fan blade 100 through the back of the fan blade 100 .

[0117] like Figure 2 and Figure 7 As shown, in some embodiments of the present invention, optionally, in the radial direction of the hub 110, the distance between the end 1204 and the axis of the hub 110 is the outer diameter d0 of the blade 100; in the radial direction of the hub 110, the length of the first section 122 is d1; wherein d0 and d1 satisfy the following relationship:

[0118] 0.01×d0≤d1≤0.2×d0.

[0119] In this embodiment, the area of ​​the first section 122 is defined. Specifically, in the radial direction of the hub 110 , the distance between the end 1204 and the axis of the hub 110 is the outer diameter d0 of the blade 100 , which is the sum of the radius of the hub 110 and the length of the blade 120 .

[0120] Correspondingly, in the radial direction of the hub 110 , the length of the first section 122 is d1, that is, the distance extending from the end 1204 to the root 1202 . The larger d1 is, the higher the coverage ratio of the first section 122 is, and the smaller d1 is, the smaller the coverage ratio of the first section 122 is.

[0121] On this basis, d0 and d1 satisfy the relationship: 0.01×d0≤d1≤0.2×d0.

[0122] By limiting the above-mentioned dimensional relationship, on the one hand, it can be ensured that the length of the first section 122 can meet the noise reduction requirements of the blade 120 and ensure the noise reduction performance of the blade 120. On the other hand, it can avoid that the excessively long first section 122 affects other inherent properties of the blade 120, broaden the scope of application of the blade 120, and enable the blade 120 to take into account multiple aerodynamic advantages.

[0123] At the same time, by limiting d1≤0.2×d0, it can also provide convenient conditions for the miniaturization and lightweight design of the fan blade 100.

[0124] like Figure 2 and Figure 7 As shown, in some embodiments of the present invention, optionally, the blade 120 also includes a second section 124, the second section 124 includes a second inner annular surface 1242 and a second outer annular surface 1244; the blade 120 also includes a third section 126, the third section 126 includes a third inner annular surface 1262 and a third outer annular surface 1264; the first section 122 connects the second section 124 and the third section 126; wherein, in the axial direction of the hub 110, the second inner annular surface 1242 and the first inner annular surface 1222 are not blocked, the third outer annular surface 1264 and the first outer annular surface 1224 are not blocked, or the third inner annular surface 1262 and the first inner annular surface 1222 are not blocked, and the second outer annular surface 1244 and the first outer annular surface 1224 are not blocked.

[0125] In this embodiment, the blade 120 also includes a second section 124 and a third section 126, and the second section 124 and the third section 126 are respectively connected to the two sides of the first section 122, that is, the first section 122 transitionally connects the second section 124 and the third section 126, and the second section 124 and the third section 126 are symmetrical with respect to the fractal line on the first section 122.

[0126] On this basis, the second section 124 includes a second inner annular surface 1242 and a second outer annular surface 1244, and the third section 126 includes a third inner annular surface 1262 and a third outer annular surface 1264. When the fan blade 100 is observed in the axial direction of the hub 110, the surface of the first section 122 that is connected to the second section 124 is the first outer annular surface 1224, and the second outer annular surface 1244 on the second section 124 is exposed together with the first outer annular surface 1224, and the second outer annular surface 1244 is not blocked, and the corresponding third inner annular surface 1262 on the third section 126 is exposed together with the first inner annular surface 1222 on the other side of the end 1204, and the third inner annular surface 1262 is not blocked, and vice versa.

[0127] By defining the second section 124 and the third section 126, two air induction sections can be formed on the basis of the first section 122. The two air induction sections are used to guide the flow direction of the airflow, on the one hand to ensure that the air supply direction and air supply intensity meet the requirements, and on the other hand to cooperate with the first section 122 to reduce the aerodynamic noise of the fan blade 100. At the same time, by defining the above-mentioned co-exposed relationship, the first section 122, the second section 124 and the third section 126 can be formed simultaneously with two molds to reduce the process complexity of the fan blade 100, reduce the mold cost, and thus improve the market competitiveness of the fan blade 100.

[0128] like Figure 2 and Figure 7 As shown, in some embodiments of the present invention, optionally, in the radial direction of the hub 110, the distance between the end 1204 and the axis of the hub 110 is the outer diameter d0 of the blade 100; in the radial direction of the hub 110, the length of the second section 124 is d2; wherein d0 and d2 satisfy the following relationship:

[0129] 0<d2<0.1×d0.

[0130] In this embodiment, the area of ​​the second section 124 is defined. Specifically, in the radial direction of the hub 110 , the distance between the end 1204 and the axis of the hub 110 is the outer diameter d0 of the blade 100 , which is the sum of the radius of the hub 110 and the length of the blade 120 .

[0131] Correspondingly, in the radial direction of the hub 110 , the length of the second section 124 is d2, that is, the distance extending from the end 1204 to the root 1202 . The larger d2 is, the higher the coverage ratio of the second section 124 is, and the smaller d2 is, the smaller the coverage ratio of the second section 124 is.

[0132] On this basis, d0 and d2 satisfy the relationship: 0<d2<0.1×d0.

[0133] By limiting the above-mentioned dimensional relationship, it is possible to avoid the excessively long second section 124 affecting other inherent properties of the blade 120 while satisfying the airflow guidance requirements through the second section 124 and the third section 126, thereby broadening the scope of application of the blade 120 and allowing the blade 120 to take into account multiple aerodynamic advantages.

[0134] At the same time, by limiting d2<0.1×d0, it can also provide convenient conditions for the miniaturization and lightweight design of the fan blade 100.

[0135] like Figure 2 and Figure 7 As shown, in some embodiments of the present invention, optionally, the fan blade 100 is configured to rotate around a first rotation direction; in the first rotation direction, the third outer annular surface 1264 is located in front of the second inner annular surface 1242.

[0136] In this embodiment, the calibrated rotation direction of the fan blade 100 is a first rotation direction, and the rotation direction during actual use may be the same as the calibrated rotation direction or may be opposite to the calibrated rotation direction.

[0137] On this basis, in the first rotation direction, the third outer annular surface 1264 is located in front of the second inner annular surface 1242, and correspondingly, the third inner annular surface 1262 is located in front of the second outer annular surface 1244. During the rotation of the fan blade 100 in the first rotation direction, the third outer annular surface 1264 and the second outer annular surface 1244 are the windward side, and the second outer annular surface 1244 and the third inner annular surface 1262 are the leeward side. In addition, in the axial direction of the hub 110, the second section 124 and the third section 126 are staggered, the third section 126 is close to the front of the hub 110, and the second section 124 is close to the back of the hub 110.

[0138] By limiting the position of the second section 124 and the third section 126 and the relationship between the calibrated rotation directions, the noise reduction performance of the blade 120 can be optimized, and the noise reduction effect of the blade 120 during high-speed rotation can be optimized, thereby improving the user experience.

[0139] like Figure 4 , Figure 5 and Figure 6 As shown, in some embodiments of the present invention, optionally, at least a portion of the first inner annular surface 1222 near the end 1204 extends in the axial direction of the hub 110; and / or at least a portion of the first outer annular surface 1224 near the end 1204 extends in the axial direction of the hub 110.

[0140] Figure 4 A front view of a fan blade 100 according to an embodiment of the present invention is shown.

[0141] Figure 5 FIG. 1 shows a schematic structural diagram of a fan blade 100 according to an embodiment of the present invention. Figure 5 The middle arrow c shows the axial direction of the hub 110 .

[0142] Figure 6 FIG. 1 shows a schematic structural diagram of a first section 122 according to an embodiment of the present invention. Figure 6 The line indicated by the arrow e shows the overlapping area of ​​the first inner annular surface 1222 .

[0143] In this embodiment, at least a portion of the first inner annular surface 1222 near the end 1204 can extend in the axial direction of the hub 110. When the fan blade 100 is observed axially from the hub 110, at least a portion of the points on the first inner annular surface 1222 overlap into a line, that is, at least a portion of the area on the first inner annular surface 1222 is obscured by itself.

[0144] Correspondingly, at least part of the first outer annular surface 1224 near the end 1204 can also extend in the axial direction of the hub 110. When the fan blade 100 is observed axially from the hub 110, at least part of the points on the first outer annular surface 1224 overlap into a line, that is, at least part of the area on the first outer annular surface 1224 is obscured by itself.

[0145] By limiting the above-mentioned features, the sharpness and torsion amplitude of the end 1204 of the blade 120 can be reduced without increasing the number of molds and the complexity of the mold structure, thereby optimizing the aerodynamic performance of the blade 120 and enabling the blade 120 to meet the air supply and noise reduction requirements of the fan blade 100.

[0146] like Fig.13 As shown, in some embodiments of the present invention, optionally, in the circumferential direction of the hub 110, the size of the hollow area 1206 is L2; ​​wherein L2>5mm.

[0147] Fig.13 1 shows a front view of a fan blade 100 according to an embodiment of the present invention, arrow a shows the radial direction of the hub 110 , and arrow f shows the circumferential direction of the hub 110 .

[0148] In this embodiment, in the circumferential direction of the hub 110, the size of the hollow area 1206 enclosed by the inner annular surface 1208 of the blade 120 is L2. When the fan blade 100 is observed in the axial direction of the hub 110, L2 is the length of the arc segment in the hollow area 1206 with the axis of the hub 110 as the axis. The size of L2 affects the width of the hollow area 1206.

[0149] On this basis, L2 needs to be greater than 5 mm. By limiting the above-mentioned size range, it can be ensured that the inner side of the blade 120 has a sufficiently wide hollow area 1206 to ensure the noise reduction performance of the blade 120 during high-speed rotation, thereby achieving the technical effect of reducing the aerodynamic noise of the fan blade 100 and improving the user experience.

[0150] like Fig.13 As shown, in some embodiments of the present invention, optionally, in the circumferential direction of the hub 110 , the size of the first section 122 is L1; and in the direction from the root 1202 to the end 1204 , L1 gradually decreases.

[0151] In this embodiment, in the circumferential direction of the hub 110, the size of the first section 122 is L1. When the fan blade 100 is observed in the axial direction of the hub 110, L1 is the length of the arc segment connecting the outer contour lines on both sides of the first section 122, and the arc segment takes the axis of the hub 110 as the axis. The size of L1 affects the width of the first section 122.

[0152] On this basis, L1 gradually decreases in the direction from the root 1202 of the blade 120 to the end 1204 of the blade 120, that is, the width of the first section 122 gradually narrows in the direction away from the hub 110, and the first section 122 is sharp. By limiting the shape of the first section 122, the noise reduction performance of the blade 120 during high-speed rotation can be guaranteed, thereby achieving the technical effect of reducing the aerodynamic noise of the fan blade 100 and improving the user experience.

[0153] like Fig.14 and Fig.15 As shown, in some embodiments of the present invention, optionally, the blade 120 is cut by an annular surface with the axis of the hub 110 as the axis to obtain a cross section 128 of the blade 120; the outer contour of the cross section 128 includes a convex first smooth curve 1282 and a concave second smooth curve 1284.

[0154] Fig.14 FIG. 1 shows a schematic structural diagram of a fan blade 100 according to an embodiment of the present invention. Fig.14 The middle arrow b shows the first rotation direction of the fan blade 100, and the arrow g shows the annular surface with the axis of the hub 110 as the axis.

[0155] Fig.15 A schematic diagram of a cross section 128 of a fan blade 100 according to an embodiment of the present invention is shown. The cross section 128 is unfolded into a plane after being cut. Arrow b shows a first rotation direction of the fan blade 100 , and arrow c shows an axial direction of the hub 110 .

[0156] In this embodiment, the shape of the blade 120 is defined. Specifically, an arbitrary area on the blade 120 is intercepted by an annular surface with the axis of the hub 110 as the axis to obtain a cross section 128 of the blade 120. The outer contour of the cross section 128 of the blade 120 includes a convex first smooth curve 1282 and a concave second smooth curve 1284. The first smooth curve 1282 and the second smooth curve 1284 are buckled to form the outer contour of the cross section 128 of the blade 120.

[0157] like Fig. 9 , Fig.10 , Fig.11 and Fig.12As shown, by limiting the shape of the above-mentioned cross-section 128, the blade 120 maintains a twisting trend throughout the entire section. Taking the case where both ends of the blade 120 are connected to the peripheral side of the hub 110 as an example, the first end of the blade 120 begins to expose the outer annular surface 1209 first, and in the direction from the first end of the blade 120 to the end 1204, the blade 120 changes the exposed area of ​​the outer annular surface 1209 by twisting, until the inner and outer annular surfaces 1209 are reversed after twisting to the end 1204, and the inner annular surface 1208 begins to be exposed, and in the direction from the end 1204 to the second end of the blade 120, the exposed area of ​​the inner annular surface 1208 also changes along with the twisting trend, and vice versa, that is, the strip-shaped blade 120 continues to twist during the circling process.

[0158] Fig. 9 A schematic structural diagram of a fan blade 100 according to an embodiment of the present invention is shown.

[0159] Fig.10 for Fig. 9 A partial enlarged view of the fan blade 100 in area A in the illustrated embodiment.

[0160] Fig.11 A schematic structural diagram of a fan blade 100 according to an embodiment of the present invention is shown.

[0161] Fig.12 for Fig.11 A partial enlarged view of the fan blade 100 in area B in the illustrated embodiment.

[0162] By limiting the shape of the cross-section 128 of the blade 120, it is possible to avoid the appearance of mutation points in shape on the blade 120, thereby ensuring the noise reduction performance of the blade 120 during high-speed rotation, thereby achieving the technical effect of reducing the aerodynamic noise of the fan blade 100 and improving the user experience, and on the other hand, reducing the resistance of the blade 120 and improving the energy efficiency ratio of the air supply equipment 200.

[0163] like Fig.14 and Fig.15 As shown, in some embodiments of the present invention, optionally, the fan blade 100 is configured to rotate around a first rotation direction; in the first rotation direction, the second smooth curve 1284 is located in front of the first smooth curve 1282.

[0164] In this embodiment, the calibrated rotation direction of the fan blade 100 is a first rotation direction, and the rotation direction during actual use may be the same as the calibrated rotation direction or may be opposite to the calibrated rotation direction.

[0165] On this basis, in the first rotation direction, the second smooth curve 1284 is located in front of the first smooth curve 1282. During the rotation of the fan blade 100 in the calibrated first rotation direction, the first smooth curve 1282 corresponds to the pressure side of the blade 120, and the second smooth curve 1284 corresponds to the suction side of the blade 120.

[0166] By limiting the relationship between the shape of the blade 120 and the rotary member, the noise reduction performance of the blade 120 can be optimized, and the noise reduction effect of the blade 120 during high-speed rotation can be optimized, thereby improving the user experience.

[0167] like Figure 2 and Figure 7 As shown, in some embodiments of the present invention, optionally, there are multiple blades 120; the multiple blades 120 are evenly distributed around the hub 110.

[0168] In this embodiment, there are multiple blades 120 , and the multiple blades 120 are evenly distributed around the hub 110 and around the axis of the hub 110 , that is, the angles between two adjacent blades 120 in the multiple blades 120 are equal.

[0169] Specifically, the number of blades 120 is greater than or equal to three.

[0170] By providing a plurality of evenly distributed blades 120 , the air supply intensity and air supply uniformity of the fan blade 100 can be improved without changing the rotation speed of the fan blade 100 , thereby optimizing the aerodynamic performance of the fan blade 100 and improving the practicality and reliability of the fan blade 100 .

[0171] like Fig.16 and Fig.17 As shown, in a specific embodiment of the present invention, the front half of the blade 120 is a single-piece structure, the rear half of the blade 120 is an annular structure, and the blade 120 encloses a hollow area 1206 through an inner annular surface 1208 .

[0172] Fig.16 A schematic structural diagram of a fan blade 100 according to an embodiment of the present invention is shown.

[0173] Fig.17 A schematic structural diagram of a fan blade 100 according to an embodiment of the present invention is shown.

[0174] like Fig.18 As shown, in a specific embodiment of the present invention, the fan blade 100 also includes an air guide ring 130, which cuts the blades 120 into two parts. The blades 120 on the outside of the air guide ring 130 are ring-shaped, and the blades 120 on the inside of the air guide ring 130 are single-piece, thereby optimizing the aerodynamic performance of the fan blade 100.

[0175] Fig.18 A schematic structural diagram of a fan blade 100 according to an embodiment of the present invention is shown.

[0176] like Fig.19 As shown, in a specific embodiment of the present invention, the fan blade 100 also includes a second blade 129, and the second blade 129 is a single-piece structure. A plurality of second blades 129 and a plurality of annular blades 120 are alternately arranged, thereby optimizing the aerodynamic performance of the fan blade 100.

[0177] Fig.19 A schematic structural diagram of a fan blade 100 according to an embodiment of the present invention is shown.

[0178] like Fig. 20 As shown, the second aspect of the present invention provides an air supply device 200, which includes: a fan blade 100 as in any of the above embodiments; a driving component 210, which is connected to the hub 110, and the driving component 210 is used to drive the fan blade 100 to rotate.

[0179] Fig. 20 A schematic structural diagram of an air supply device 200 according to an embodiment of the present invention is shown.

[0180] In this embodiment, an air supply device 200 including the fan blade 100 in any of the above embodiments is defined, and the air supply device 200 includes: a floor fan, a cooling fan, an exhaust fan, etc. Therefore, the air supply device 200 has the advantages of the fan blade 100 in any of the above embodiments, and can achieve the technical effects that the fan blade 100 in any of the above embodiments can achieve, and to avoid repetition, it will not be repeated here.

[0181] On this basis, the air supply device 200 further includes a driving component 210, which is connected to the hub 110 on the fan blade 100. After power is supplied, the driving component 210 is used to drive the hub 110 and the blade 120 to rotate synchronously.

[0182] Specifically, the driving component 210 includes a motor, and a rotating shaft on the motor is inserted into the hub 110 to drive the hub 110 and the blades 120 to rotate.

[0183] It should be clarified that in the claims, specification and drawings of the present invention, the term "multiple" refers to two or more than two. Unless otherwise clearly defined, the orientation or position relationship indicated by the terms "upper" and "lower" is based on the orientation or position relationship shown in the drawings, which is only for the purpose of more conveniently describing the present invention and making the description process simpler, rather than indicating or implying that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation, so these descriptions cannot be understood as limiting the present invention; the terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances of the above data.

[0184] In the claims, specification and drawings of the present invention, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0185] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fan blade, characterized in that: include: Wheel hub; A blade connected to the peripheral side surface of the hub, the blade is annular, the inner annular surface of the blade encloses a hollow area, or the inner annular surface of the blade and the peripheral side surface of the hub enclose a hollow area; In the radial direction of the hub, the end of the blade connected to the hub is the root of the blade, and the end away from the hub is the end of the blade; Wherein, in the direction from the end to the root, at least a part of the area of ​​the blade is a first section, and the first section includes a first inner annular surface and a first outer annular surface; In the axial direction of the hub, the first inner annular surface and the first outer annular surface are reversed at the end, and the first inner annular surface and the first outer annular surface on both sides of the end do not cover each other.

2. The fan blade according to claim 1, characterized in that: In the radial direction of the hub, the distance between the end and the axis of the hub is the outer diameter d0 of the blade; In the radial direction of the hub, the length of the first section is d1; Among them, d0 and d1 satisfy the following relationship: 0.01×d0≤d1≤0.2×d0.

3. The fan blade according to claim 1, characterized in that: The blade further includes a second section, the second section including a second inner annular surface and a second outer annular surface; The blade further comprises a third section, wherein the third section comprises a third inner annular surface and a third outer annular surface; The first section connects the second section and the third section; Among them, in the axial direction of the hub, the second inner annular surface and the first inner annular surface are not blocked, the third outer annular surface and the first outer annular surface are not blocked, or the third inner annular surface and the first inner annular surface are not blocked, and the second outer annular surface and the first outer annular surface are not blocked.

4. The fan blade according to claim 3, characterized in that: In the radial direction of the hub, the distance between the end and the axis of the hub is the outer diameter d0 of the blade; In the radial direction of the hub, the length of the second section is d2; Among them, d0 and d2 satisfy the following relationship: 0<d2<0.1×d0.

5. The fan blade according to claim 3, characterized in that: The fan blade is configured to rotate about a first rotation direction; In the first rotation direction, the third outer annular surface is located on the front side of the second inner annular surface.

6. The fan blade according to any one of claims 1 to 5, characterized in that: At least a portion of the first inner annular surface close to the end portion extends in the axial direction of the hub; and / or At least a portion of the first outer annular surface adjacent to the end portion extends in the axial direction of the hub.

7. The fan blade according to any one of claims 1 to 5, characterized in that: In the circumferential direction of the hub, the size of the hollow area is L2; Among them, L2>5mm.

8. The fan blade according to any one of claims 1 to 5, characterized in that: In the circumferential direction of the hub, the size of the first section is L1; In the direction from the root to the end, L1 decreases gradually.

9. The fan blade according to any one of claims 1 to 5, characterized in that: The blade is cut through an annular surface with the axis of the hub as the axis to obtain a cross section of the blade; The outer contour of the cross section includes a first smooth curve that is convex outward and a second smooth curve that is concave inward.

10. The fan blade according to claim 9, characterized in that: The fan blade is configured to rotate about a first rotation direction; In the first rotation direction, the second smooth curve is located in front of the first smooth curve.

11. The fan blade according to any one of claims 1 to 5, characterized in that: The number of the blades is multiple; The plurality of blades are evenly distributed around the hub.

12. An air supply device, characterized in that: include: The fan blade according to any one of claims 1 to 11; A driving component is connected to the wheel hub, and the driving component is used to drive the fan blades to rotate.

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