Fan blade and air supply device

Abstract

To provide a fan blade which can reduce a noise.SOLUTION: A fan blade includes a hub and a blade. The blade is connected to a peripheral lateral face of the hub. The blade is in an annular shape, and has a hollow region formed while surrounded by an inner annular face of the blade, or has a hollow region formed while surrounded by the inner annular face of the blade and the peripheral lateral face of the hub. In a radial direction of the hub, one end of the blade in contact with the hub is a root of the blade, and one end away from the hub is an end part of the blade. In a direction from the end part to the root, at least a part of a region of the blade is a first section. The first section includes a first inner annular face and a first outer annular face. In an axial direction of the hub, the first inner annular face and the first outer annular face reverse directions thereof at the end part, and the first inner annular face and the first outer annular face at both sides of the end part are not mutually shielded.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application with an application number of 202311856952.9 and an application title of "Fan Blade and Air Supply Device", which was filed with the China National Intellectual Property Administration on December 29, 2023, and incorporates all of its content by reference.

[0002] The present invention relates to the technical field of air supply devices, and specifically to fan blades and air supply devices.

Background Art

[0003] In related technologies, some fan blades use the solution of annular blades to reduce noise.

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the structure of the tip of the annular blade is complex and cannot be manufactured by a mold, or the mold structure is complex, the cost is high, and the manufactured blade has structures such as burrs that affect the product performance. As a result, the blade has technical defects such as high complexity of the manufacturing process, high process cost, and poor product performance.

[0005] Therefore, how to eliminate the above technical defects has become a technical problem to be solved.

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art.

Means for Solving the Problems

[0007] Therefore, a first aspect of the present invention provides a fan blade.

[0008] A second aspect of the present invention provides an air supply device.

[0009] In view of this, a first aspect of the present invention provides a fan blade, the fan blade including a hub and blades, the blades being connected to the circumferential side surface of the hub, the blades being annular, a hollow region being formed surrounded by the inner annular surface of the blades, or a hollow region being formed surrounded by the inner annular surface of the blades and the circumferential side surface of the hub. In the radial direction of the hub, one end of the blade in contact with the hub is the root of the blade, and one end on the side far from the hub is the end of the blade. In the direction from the end to the root, at least a part of the region of the blade is a first section, the first section including 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 in direction at the end, and the first inner annular surface and the first outer annular surface on both sides of the end do not shield each other.

[0010] In this technical solution, a fan blade is provided, and the fan blade can be applied to an air supply device. The rotating fan blade can blow out a directional air flow, thereby supplying air to a specified area.

[0011] The fan blade includes a hub and blades. The hub is the rotation center of the fan blade, and the blades are attached to the circumferential side of the hub. During the operation process, the hub drives the blades to rotate around its own axis, and the synchronously rotating blades blow out a directional air flow.

[0012] Here, the blades are annular. Specifically, they can be closed annular blades, which may be connected to the hub on the outside, or annular blades with an opening, which may be connected to the hub through the opening. The blades include an inner annular surface and an outer annular surface. When the blades themselves are closed, a hollow region is formed surrounded by the inner annular surface of the blades, and there is an included angle between the axis of the hollow region and the axis of the hub. When the blades are provided with an opening, a hollow region is formed surrounded by the inner annular surface of the blades and the circumferential side surface of the hub. Similarly, there is an included angle between the hollow region and the axis of the hub.

[0013] Specifically, in an annular blade, the region connected to the hub is the root of the blade, and one end far from the hub in the radial direction of the hub is the end of the blade.

[0014] During the process of the blade rotating at high speed, noise reduction can be achieved by the hollow region formed by surrounding, thereby reducing the noise generated during the process of the fan blade rotating at high speed, thus realizing the noise reduction design of the fan blade and improving the user experience.

[0015] Specifically, manufacturing an annular blade by a casting process can improve manufacturing efficiency and reduce manufacturing costs. However, due to the high structural complexity of the end of the annular blade, it is necessary to form the end of the annular blade by molds with multiple different demolding directions during the manufacturing process. Therefore, the complexity and cost of the mold increase, and in extreme cases, the complex end cannot be formed by the mold. In addition, when the ends of the blade are jointly formed by multiple molds, there are inevitable gaps between two adjacent molds, and burrs are formed at the ends of the blade due to these gaps. These burrs destroy the aerodynamic characteristics of the blade, so the aerodynamic performance of the blade is damaged and the aerodynamic noise increases.

[0016] In contrast, in the blade provided by the present application, at least a part of the region from the end of the blade to the root of the blade is the first section, that is, the first section necessarily includes the end of the blade, and the first section may be the tip of the blade, the second half of the blade or the entire section of the blade.

[0017] Here, the first section includes a first inner annular surface and a first outer annular surface. When observing the fan blade along the axial direction of the hub, the first inner annular surface and the first outer annular surface are twisted at the ends to reverse their directions, that is, the ends are boundary regions in the first section. For example, the originally observable first inner annular surface is reversed in the back direction through the twist at the end, and the originally unobservable first outer annular surface is reversed in the observable front direction through the twist at the end. Or the originally observable first outer annular surface is reversed in the back direction through the twist at the end, and the originally unobservable first inner annular surface is reversed in the observable front direction through the twist at the end.

[0018] Based on this, the first outer annular surface and the first inner annular surface on both sides of the end do not shield each other. For example, before the first section reverses its direction, it exposes the first outer annular surface, and the first inner annular surface after reversal does not shield the first outer annular surface. Similarly, the first outer annular surface before reversal does not shield the first inner annular surface after reversal, and vice versa.

[0019] By providing the first section that does not shield each other, the first section can be formed by two molds. The demolding directions of the two molds correspond to two directions of the axis of the hub, that is, one mold demolds from the front and forms the first inner annular surface and the first outer annular surface that can be observed from the front, and the other mold demolds from the back and forms the first inner annular surface and the first outer annular surface that cannot be observed. This reduces the number of molds for forming the first section. The end corresponds to the parting line between these two molds, that is, the structure on the first side of the end is formed by one mold, and the structure on the other side is formed by the other mold.

[0020] As can be seen from this, the blade provided by the present application can reduce the number of molds by optimizing the structure at the tip, thereby reducing the complexity of the molds and the cost of the molds, and enabling the blade to be applied to the integral molding process of the molds. In addition, reducing the number of molds can reduce the possibility of burrs appearing on the blade, thereby improving the aerodynamic performance of the blade, reducing the air pressure noise of the blade, and thus eliminating the technical defects existing in the related art.

[0021] Furthermore, the structure of the blade is optimized to reduce the complexity of the blade manufacturing process, reduce the manufacturing cost of the blade, and achieve the technical effect of improving the product performance of the blade.

[0022] Specifically, the front of the fan blade corresponds to the front of the hub, the back of the fan blade corresponds to the back of the hub, there is a blind hole for inserting the rotating shaft on the back of the hub, and the rotating shaft is inserted into the fan blade from the back of the fan blade.

[0023] In addition, the above fan blade provided by the present invention may further have the following additional technical features.

[0024] In some technical solutions of the present invention, optionally, in the radial direction of the hub, the distance between the end portion and the axis of the hub is the outer diameter d0 of the fan blade, in the radial direction of the hub, the length of the first section is d1, and d0 and d1 Satisfy the relational expression 0.01×d0≦d1≦0.2×d0.

[0025] In this technical solution, the area of the first section is limited. Specifically, in the radial direction of the hub, the distance between the end portion and the axis of the hub is the outer diameter d0 of the fan blade, and the outer diameter d0 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 occupancy rate of the first section is, and the smaller d1 is, the lower the occupancy rate of the first section is.

[0027] Based on this, d0 and d1 satisfy the relational expression 0.01×d0≦d1≦0.2×d0.

[0028] By limiting the above size relational expression, on the one hand, it is ensured that the length of the first section can meet the noise reduction needs of the blade, and the noise reduction performance of the blade can be ensured. On the other hand, it is avoided that an overly long first section affects other inherent attributes of the blade, the application range of the blade can be expanded, and the blade can achieve multiple aerodynamic advantages.

[0029] Moreover, by limiting to d1≦0.2×d0, it is possible to further provide advantageous conditions for the miniaturization design and weight reduction design of the fan blade.

[0030] In some technical solutions of the present invention, optionally, the blade further includes a second section, and the second section includes a second inner annular surface and a second outer annular surface. The blade further includes a third section, and 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. Here, in the axial direction of the hub, the second inner annular surface and the first inner annular surface are not shielded, and the third outer annular surface and the first outer annular surface are not shielded. Or the third inner annular surface and the first inner annular surface are not shielded, and the second outer annular surface and the first outer annular surface are not shielded.

[0031] In this technical solution, the blade further includes a second section and a third section, and the second section and the third section are respectively connected to both sides of the first section. That is, the first section transitions and connects to the second section and the third section, and the second section and the third section are symmetric with respect to the dividing line on the first section.

[0032] Based on this, 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 observing the fan blade along the axial direction of the hub, the surface of the first section that contacts the second section is the first outer annular surface. In that case, the second outer annular surface of the second section and the first outer annular surface are simultaneously exposed, and the second outer annular surface is not shielded. Correspondingly, the third inner annular surface of the third section and the first inner annular surface on the other side of the end are simultaneously exposed, and the third inner annular surface is not shielded, and vice versa.

[0033] By limiting the above-mentioned second section and third section, two guiding parts can be formed based on the first section. The two guiding parts are used to guide the flowing direction of the air flow. On the one hand, it ensures that the air supply direction and air supply intensity meet the needs. On the other hand, it can reduce the air pressure noise of the fan blade in combination with the first section. Also, by limiting the above-mentioned simultaneous exposure relationship, the first section, the second section, and the third section can be simultaneously molded by two molds, thereby reducing the process complexity of the fan blade, reducing the mold cost, and further improving 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 fan blade. In the radial direction of the hub, the length of the second section is d2, and d0 and d2 satisfy the relational expression 0 < d2 < 0.1×d0.

[0035] In this technical solution, the area of the second section is limited. 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 fan blade, and the outer diameter d0 is the sum of the radius of the hub and the length of the blade.

[0036] Correspondingly, in the radial direction of the hub, the length of the second section is d2, that is, it is the distance that the second section extends in the direction from the end to the root. The larger d2 is, the higher the occupancy rate of the second section; the smaller d2 is, the lower the occupancy rate of the second section.

[0037] Based on this, d0 and d2 satisfy the relational expression 0 < d2 < 0.1×d0.

[0038] By limiting the above size relational expression, it is possible to avoid the situation that an overly long second section affects other inherent attributes of the blade when the second section and the third section satisfy the airflow guiding needs, thereby expanding the application range of the blade, and enabling the blade to achieve multiple aerodynamic advantages.

[0039] Moreover, by limiting d2 < 0.1×d0, it is possible to further provide favorable conditions for the miniaturization design and weight reduction design of the fan blade.

[0040] 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.

[0041] In this technical solution, the standard rotation direction of the fan blade is the first rotation direction. In the actual use process, the rotation direction may be the same as the standard rotation direction or opposite to the standard rotation direction.

[0042] Based on this, 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 process of the fan blade rotating along the first rotation direction, the third outer annular surface and the second inner annular surface are on the upwind side, and the second outer annular surface and the third inner annular surface are on the downwind side. And in the axial direction of the hub, the second section and the third section are provided offset, the third section is close to the front of the hub, and the second section is close to the back of the hub.

[0043] By limiting the relationship between the position of the second section and the standard rotation direction and the relationship between the position of the third section and the standard rotation direction, the noise reduction performance of the blade can be optimized, the noise reduction effect during the process of the blade rotating at high speed can be optimized, and thereby the user experience can be improved.

[0044] In some technical solutions of the present invention, optionally, at least a part of the first inner annular surface near the end extends in the axial direction of the hub, and / or at least a part of the first outer annular surface near the end extends in the axial direction of the hub.

[0045] In this technical solution, at least a part of the first inner annular surface near the end can extend in the axial direction of the hub. When observing the fan blade in the axial direction of the hub, the points on at least a part of the first inner annular surface overlap to form a single line, that is, at least a part of the area on the first inner annular surface is shielded by itself.

[0046] Correspondingly, at least a part of the first outer annular surface near the end can also extend in the axial direction of the hub. When observing the fan blade along the axial direction of the hub, the points on at least a part of the first outer annular surface overlap to form a single line, that is, at least a part of the area on the first outer annular surface is shielded by itself.

[0047] By limiting the above characteristics, without increasing the number of molds and the complexity of the mold structure, the sharpness and twist width of the blade end can be reduced, thereby optimizing the aerodynamic performance of the blade, and the blade can meet the air supply needs and noise reduction needs of the fan blade.

[0048] In some technical solutions of the present invention, optionally, in the circumferential direction of the hub, the size of the hollow region is L2, and L2>5mm.

[0049] In the solution of this technology, in the circumferential direction of the hub, the size of the hollow region formed and surrounded by the inner annular surface of the blade is L2. When observing the fan blade along the axial direction of the hub, L2 is the length of the arc segment with the axis of the hub as the axis in the hollow region, and the size of L2 affects the width of the hollow region.

[0050] Based on this, L2 needs to be greater than 5 mm. By limiting the above size range, it is possible to ensure that there is a sufficiently wide hollow region inside the blade, thereby ensuring the noise reduction performance during the process of the blade rotating at high speed, further reducing the aerodynamic noise of the fan blade, and realizing the technical effect of improving the user experience.

[0051] 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.

[0052] In the solution of this technology, in the circumferential direction of the hub, the size of the first section is L1. When observing the fan blade along 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 takes the axis of the hub as the axis. The size of L1 affects the width of the first section.

[0053] Based on this, in the direction from the root of the blade to the end of the blade, L1 gradually decreases, that is, the width of the first section gradually decreases in the direction away from the hub, and the first section is sharp. By limiting the shape of the first section, it is possible to ensure the noise reduction performance during the process of the blade rotating at high speed, further reducing the aerodynamic noise of the fan blade, and realizing the technical effect of improving the user experience.

[0054] In some technical solutions of the present invention, optionally, the blade is cut by an annular surface centered on the axis of the hub to obtain a cross-section of the blade, and the outer contour of the cross-section includes a first smooth curve protruding outward and a second smooth curve concave inward.

[0055] In this technical solution, the shape of the blade is limited. Specifically, any region of the blade is cut by an annular surface centered on the axis of the hub to obtain a cross-section of the blade. Here, the outer contour of the cross-section of the blade includes a first smooth curve protruding outward and a second smooth curve concave inward, and the first smooth curve and the second smooth curve are combined to form the outer contour of the cross-section of the blade.

[0056] By limiting the shape of the above cross-section, the blade maintains a torsional tendency throughout. Taking the example that both ends of the blade are connected to the circumferential side surface of the hub, the first end of the blade first exposes the outer annular surface. 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 torsion, and when it is twisted to the end, the inversion of the inner and outer annular surfaces is completed. Then, the inner annular surface is exposed, and 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 torsional tendency. Vice versa, that is, the strip-shaped blade continuously twists during one revolution.

[0057] By limiting the shape of the cross-section of the above blade, it is possible to avoid the appearance of sharp change points in the shape of the blade. Thereby, on the one hand, it ensures the noise reduction performance during the process of the blade rotating at high speed, further reduces the aerodynamic noise of the fan blade, and realizes the technical effect of improving the user experience. On the other hand, it reduces the resistance of the blade and improves the energy efficiency ratio of the air supply device.

[0058] In some technical solutions of the present invention, optionally, the fan blade is configured to rotate around a first rotation direction, and in the first rotation direction, the second smooth curve is located in front of the first smooth curve.

[0059] In the solution of this technology, the standard rotation direction of the fan blade is the first rotation direction, and the rotation direction during the actual use process may be the same as the standard rotation direction or opposite to the standard rotation direction.

[0060] Based on this, in the first rotation direction, the second smooth curve is located in front of the first smooth curve. During the process of the fan blade rotating around the standard 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.

[0061] By limiting the relationship between the shape and rotation direction of the above blade, the noise reduction performance of the blade can be optimized, the noise reduction effect during the process of the blade rotating at high speed can be optimized, and thereby the user experience can be improved.

[0062] In some technical solutions of the present invention, optionally, the number of blades is plural, and the plural blades surround the hub and are uniformly distributed.

[0063] In the solution of this technology, the number of blades is plural, and the plural blades are uniformly distributed around the hub around the axis of the hub. That is, the included angle between two adjacent blades among the plural blades is equal.

[0064] Specifically, the number of blades is 3 or more.

[0065] By providing plural blades that are uniformly distributed, the air supply intensity and air supply uniformity of the fan blade can be improved without changing the rotation speed of the fan blade, thereby optimizing the aerodynamic performance of the fan blade and improving the practicality and reliability of the fan blade.

[0066] The second aspect of the present invention provides an air supply device, and the air supply device includes the fan blade of any of the above technical solutions and a driving member connected to the hub for driving the fan blade to rotate.

[0067] In the solution of this technology, an air supply device including the fan blade of any of the above technical solutions is defined. The air supply device includes a floor fan, a heat dissipation fan, an exhaust fan, etc. Therefore, the air supply device has the advantages of the fan blade of any of the above technical solutions, can achieve the technical effects that the fan blade of any of the above technical solutions can achieve, and in order to avoid duplication, it will not be repeatedly described here.

[0068] Based on this, the air supply device further includes a driving member, and the driving member is connected to the hub of the fan blade and is used to drive the hub and the blade to rotate synchronously after being energized.

[0069] Specifically, the driving member includes a motor, and the rotating shaft of the motor is inserted into the hub, thereby driving the hub and the blade to rotate.

[0070] Additional aspects and advantages of the present invention will become apparent in the following description part or be understood by the implementation of the present invention.

[0071] The above and / or additional aspects and advantages of the present application will become apparent and easier to understand from the description of the embodiments in conjunction with the following drawings.

Brief Description of the Drawings

[0072]

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Mode for Carrying Out the Invention

[0073] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be described in more detail below in conjunction with the drawings and specific embodiments. As long as there is no contradiction, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0074] Although many details are set forth in the following description for a full understanding of the present invention, the present invention may be practiced in other forms different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0075] Next, referring to FIGS. 1 to 20, a fan blade and an air supply device according to some embodiments of the present invention will be described.

[0076] As shown in FIGS. 1, 2, 3, 7, and 8, an embodiment of the present invention provides a fan blade 100, which includes a hub 110 and blades 120. The blades 120 are connected to the circumferential side surface of the hub 110. The blades 120 are annular, and a hollow region 1206 is formed surrounded by the inner annular surface 1208 of the blades 120. Alternatively, a hollow region 1206 is formed surrounded by the inner annular surface 1208 of the blades 120 and the circumferential side surface of the hub 110. In the radial direction of the hub 110, one end of the blade 120 in contact with the hub 110 is the root 1202 of the blade 120, and the end on the side far from the hub 110 is the end 1204 of the blade 120. In the direction from the end 1204 to the root 1202, at least a part of the region 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 shield each other.

[0077] FIG. 1 shows a front view of the fan blade 100 according to an embodiment of the present invention.

[0078] FIG. 2 shows a front view of the fan blade 100 according to an embodiment of the present invention. The arrow a in FIG. 2 indicates the radial direction of the hub 110, and the arrow b indicates the first rotation direction of the fan blade 100.

[0079] FIG. 3 shows a rear view of the fan blade 100 according to an embodiment of the present invention.

[0080] FIG. 7 shows a front view of a fan blade 100 according to an embodiment of the present invention. Arrow a in FIG. 7 indicates the radial direction of the hub 110, and arrow b indicates the first rotation direction of the fan blade 100.

[0081] FIG. 8 shows a rear view of the fan blade 100 according to an embodiment of the present invention.

[0082] In this embodiment, a fan blade 100 is provided. The fan blade 100 can be applied to an air supply device 200. The rotating fan blade 100 can blow out a directional air flow, thereby supplying air to a specified area.

[0083] The fan blade 100 includes a hub 110 and blades 120. The hub 110 is the rotation center of the fan blade 100. The blades 120 are attached to the circumferential side of the hub 110. During the operation process, the hub 110 drives the blades 120 to rotate around its own axis, and the synchronously rotating blades 120 blow out a directional air flow.

[0084] Here, the blade 120 is annular. Specifically, it can be a closed annular blade 120, and its outer side may be connected to the hub 110, or it can be an annular blade 120 with an opening, and it may be 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 itself is closed, a hollow region 1206 is formed surrounded by the inner annular surface 1208 of the blade 120, and there is an included angle between the axis of the hollow region 1206 and the axis of the hub 110. When the blade 120 has an opening, a hollow region 1206 is formed surrounded by the inner annular surface 1208 of the blade 120 and the circumferential side surface of the hub 110. Similarly, there is an included angle between the hollow region 1206 and the axis of the hub 110.

[0085] Specifically, in the annular blade 120, the region connected to the hub 110 is the root 1202 of the blade 120, and one end far from the hub 110 in the radial direction of the hub 110 is the end 1204 of the blade 120.

[0086] During the process of the blade 120 rotating at high speed, noise reduction can be achieved by the hollow region 1206 formed around it, thereby reducing the noise generated during the process of the fan blade 100 rotating at high speed, realizing the noise reduction design of the fan blade 100, and improving the user experience.

[0087] Specifically, manufacturing the annular blade 120 by the casting process can improve the manufacturing efficiency and reduce the manufacturing cost. However, due to the high complexity of the structure of the end portion 1204 of the annular blade 120, it is necessary to form the end portion 1204 of the annular blade 120 by molds with multiple different demolding directions during the manufacturing process. Therefore, the complexity and cost of the mold are increased. In extreme cases, the complex end portion 1204 cannot be formed by the mold. In addition, when the end portion 1204 of the blade 120 is jointly formed by multiple molds, there is an inevitable gap between two adjacent molds, and burrs are formed on the end portion 1204 of the blade 120 due to the gap. The burrs destroy the aerodynamic characteristics of the blade 120. Therefore, the air pressure performance of the blade 120 is impaired and the air pressure noise increases.

[0088] In contrast, in the blade 120 provided in the present application, at least a part of the region from the end portion 1204 to the root portion 1202 of the blade 120 is the first section 122, that is, the first section 122 necessarily includes the end portion 1204 of the blade 120. The first section 122 may be the tip of the blade 120, the latter half of the blade 120, or the entire section of the blade 120.

[0089] The first section 122 includes a first inner toroidal surface 1222 and a first outer toroidal surface 1224. When observing the fan blade 100 along the axial direction of the hub 110, the first inner toroidal surface 1222 and the first outer toroidal surface 1224 are twisted and reversed in direction at the end 1204. That is, the end 1204 is a boundary region in the first section 122. For example, the first inner toroidal surface 1222 that can originally be observed is reversed to the back direction through the twist at the end 1204, and the first outer toroidal surface 1224 that cannot originally be observed is reversed to the observable front direction through the twist at the end 1204. Or the first outer toroidal surface 1224 that can originally be observed is reversed to the back direction through the twist at the end 1204, and the first inner toroidal surface 1222 that cannot originally be observed is reversed to the observable front direction through the twist at the end 1204.

[0090] Based on this, the first outer toroidal surface 1224 and the first inner toroidal surface 1222 on both sides of the end 1204 do not shield each other. For example, the first section 122 exposes the first outer toroidal surface 1224 before the direction is reversed, and the first inner toroidal surface 1222 after the reversal does not shield the first outer toroidal surface 1224. Similarly, the first outer toroidal surface 1224 before the reversal does not shield the first inner toroidal surface 1222 after the reversal, and vice versa.

[0091] By providing the first section 122 that does not shield each other, the first section 122 can be formed by two molds. The demolding directions of the two molds correspond to two directions of the axis of the hub 110. That is, one mold demolds from the front and forms the first inner toroidal surface 1222 and the first outer toroidal surface 1224 that can be observed from the front, and the other mold demolds from the back and forms the first inner toroidal surface 1222 and the first outer toroidal surface 1224 that cannot be observed. Thereby, the number of molds for forming the first section 122 is reduced. The end 1204 corresponds to the parting line between the two molds. That is, the structure on the first side of the end 1204 is formed by one mold, and the structure on the other side is formed by the other mold.

[0092] As can be seen from this, the blade 120 provided in the present application can reduce the number of molds by optimizing the tip structure, thereby reducing the complexity of the molds and the cost of the molds, and enabling the blade 120 to be applied to the integral molding process of the molds. Further, reducing the number of molds can reduce the possibility of burrs appearing on the blade 120, thereby improving the aerodynamic performance of the blade 120, reducing the air pressure noise of the blade 120, and thus eliminating the technical defects existing in the related art.

[0093] Furthermore, the structure of the blade 120 is optimized to reduce the complexity of the manufacturing process of the blade 120, reduce the manufacturing cost of the blade 120, and achieve the technical effect of improving the product performance of the blade 120.

[0094] Specifically, the front surface of the fan blade 100 corresponds to the front surface of the hub 110, the back surface of the fan blade 100 corresponds to the back surface of the hub 110, and there is a blind hole for inserting a rotating shaft on the back surface of the hub 110. The rotating shaft is inserted into the fan blade 100 from the back surface of the fan blade 100.

[0095] As shown in FIGS. 2 and 7, in some embodiments of the present invention, optionally, in the radial direction of the hub 110, the distance between the end portion 1204 and the axis of the hub 110 is the outer diameter d0 of the fan blade 100, and in the radial direction of the hub 110, the length of the first section 122 is d1, and d0 and d1 satisfy the relational expression 0.01×d0≦d1≦0.2×d0.

[0096] In this embodiment, the region of the first section 122 is limited. Specifically, in the radial direction of the hub 110, the distance between the end portion 1204 and the axis of the hub 110 is the outer diameter d0 of the fan blade 100, and the outer diameter d0 is the sum of the radius of the hub 110 and the length of the blade 120.

[0097] 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 towards the root 1202. The larger d1 is, the higher the occupancy rate of the first section 122; the smaller d1 is, the lower the occupancy rate of the first section 122.

[0098] Based on this, d0 and d1 satisfy the relational expression 0.01×d0 ≦ d1 ≦ 0.2×d0.

[0099] By limiting the above size relational expression, on the one hand, it is ensured that the length of the first section 122 can meet the noise reduction needs of the blade 120, and the noise reduction performance of the blade 120 can be ensured. On the other hand, it is avoided that the overly long first section 122 affects other inherent attributes of the blade 120, the application range of the blade 120 can be expanded, and the blade 120 can achieve multiple aerodynamic advantages.

[0100] Also, by limiting d1 ≦ 0.2×d0, more favorable conditions for the miniaturization design and weight reduction design of the fan blade 100 can be provided.

[0101] As shown in FIGS. 2 and 7, in some embodiments of the present invention, optionally, the blade 120 further includes a second section 124, and the second section 124 includes a second inner annular surface 1242 and a second outer annular surface 1244. The blade 120 further includes a third section 126, and 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. Here, in the axial direction of the hub 110, the second inner annular surface 1242 and the first inner annular surface 1222 are not shielded, and the third outer annular surface 1264 and the first outer annular surface 1224 are not shielded. Or the third inner annular surface 1262 and the first inner annular surface 1222 are not shielded, and the second outer annular surface 1244 and the first outer annular surface 1224 are not shielded.

[0102] In this embodiment, the blade 120 further includes a second section 124 and a third section 126, and the second section 124 and the third section 126 are respectively connected to both sides of the first section 122. That is, the first section 122 transitions and connects to the second section 124 and the third section 126, and the second section 124 and the third section 126 are symmetric with respect to the dividing line on the first section 122.

[0103] Based on this, 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 observing the fan blade 100 along the axial direction of the hub 110, the surface of the first section 122 in contact with the second section 124 is the first outer annular surface 1224. In that case, the second outer annular surface 1244 of the second section 124 and the first outer annular surface 1224 are simultaneously exposed, and the second outer annular surface 1244 is not shielded. Correspondingly, the third inner annular surface 1262 of the third section 126 and the first inner annular surface 1222 on the other side of the end 1204 are simultaneously exposed, and the third inner annular surface 1262 is not shielded, and vice versa.

[0104] By limiting the second section 124 and the third section 126 above, two guide parts can be formed based on the first section 122. The two guide parts are used to guide the flowing direction of the air flow. On the one hand, it ensures that the air supply direction and the air supply intensity meet the needs. On the other hand, it can reduce the air pressure noise of the fan blade 100 in combination with the first section 122. Also, by limiting the above simultaneous exposure relationship, the first section 122, the second section 124, and the third section 126 can be simultaneously molded by two molds, thereby reducing the process complexity of the fan blade 100, reducing the mold cost, and further improving the market competitiveness of the fan blade 100.

[0105] As shown in FIGS. 2 and 7, in some embodiments of the present invention, optionally, in the radial direction of the hub 110, the distance between the end portion 1204 and the axis of the hub 110 is the outer diameter d0 of the fan blade 100, and in the radial direction of the hub 110, the length of the second section 124 is d2, where d0 and d2 satisfy the relational expression 0 < d2 < 0.1×d0.

[0106] In this embodiment, the region of the second section 124 is limited. Specifically, in the radial direction of the hub 110, the distance between the end portion 1204 and the axis of the hub 110 is the outer diameter d0 of the fan blade 100, and the outer diameter d0 is the sum of the radius of the hub 110 and the length of the blade 120.

[0107] Correspondingly, in the radial direction of the hub 110, the length of the second section 124 is d2, that is, it is the distance that the second section 124 extends in the direction from the end portion 1204 to the root 1202. The larger d2 is, the higher the occupancy rate of the second section 124 is, and the smaller d2 is, the lower the occupancy rate of the second section 124 is.

[0108] Based on this, d0 and d2 satisfy the relational expression 0 < d2 < 0.1×d0.

[0109] By limiting the above size relational expression, it is possible to avoid the situation that the second section 124 that is too long affects other inherent attributes of the blade 120 when satisfying the air flow guiding needs by the second section 124 and the third section 126. Thereby, the application range of the blade 120 can be expanded, and the blade 120 can achieve a plurality of aerodynamic advantages.

[0110] In addition, by limiting d2 < 0.1×d0, it is possible to further provide advantageous conditions for the miniaturization design and weight reduction design of the fan blade 100.

[0111] As shown in FIGS. 2 and 7, in some embodiments of the present invention, optionally, the fan blade 100 is configured to rotate about a first rotation direction, and in the first rotation direction, the third outer annular surface 1264 is located in front of the second inner annular surface 1242.

[0112] In this embodiment, the standard rotation direction of the fan blade 100 is the first rotation direction, and the rotation direction during actual use may be the same as the standard rotation direction or opposite to the standard rotation direction.

[0113] Based on this, 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 process of the fan blade 100 rotating along the first rotation direction, the third outer annular surface 1264 and the second inner annular surface 1242 are on the windward side, and the second outer annular surface 1244 and the third inner annular surface 1262 are on the leeward side. And in the axial direction of the hub 110, the second section 124 and the third section 126 are provided offset, 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.

[0114] By limiting the relationship between the position of the second section 124 and the standard rotation direction and the relationship between the position of the third section 126 and the standard rotation direction, the noise reduction performance of the blade 120 can be optimized, the noise reduction effect during the process of the blade 120 rotating at high speed can be optimized, thereby improving the user experience.

[0115] As shown in FIGS. 4, 5 and 6, in some embodiments of the present invention, optionally, at least a part of the first inner annular surface 1222 close to the end 1204 extends in the axial direction of the hub 110, and / or at least a part of the first outer annular surface 1224 close to the end 1204 extends in the axial direction of the hub 110.

[0116] FIG. 4 shows a front view of the fan blade 100 according to an embodiment of the present invention.

[0117] FIG. 5 shows a schematic structural view of a fan blade 100 according to an embodiment of the present invention, and the arrow c in FIG. 5 indicates the axial direction of the hub 110.

[0118] FIG. 6 shows a schematic structural view of a first section 122 according to an embodiment of the present invention, and the line indicated by the arrow e in FIG. 6 indicates the overlapping region of the first inner annular surface 1222.

[0119] In this embodiment, at least a part of the first inner annular surface 1222 near the end 1204 can extend in the axial direction of the hub 110. When observing the fan blade 100 in the axial direction of the hub 110, the points on at least a part of the first inner annular surface 1222 overlap to form a single line. That is, at least a part of the region on the first inner annular surface 1222 is shielded by itself.

[0120] Correspondingly, at least a part of the first outer annular surface 1224 near the end 1204 can also extend in the axial direction of the hub 110. When observing the fan blade 100 along the axial direction of the hub 110, the points on at least a part of the first outer annular surface 1224 overlap to form a single line. That is, at least a part of the region on the first outer annular surface 1224 is shielded by itself.

[0121] By limiting the above features, without increasing the number of molds and the complexity of the mold structure, the sharpness and twist width of the end 1204 of the blade 120 can be reduced, thereby optimizing the aerodynamic performance of the blade 120, and the blade 120 can meet the air supply needs and noise reduction needs of the fan blade 100.

[0122] As shown in FIG. 13, in some embodiments of the present invention, optionally, in the circumferential direction of the hub 110, the size of the hollow region 1206 is L2, and L2 > 5 mm.

[0123] FIG. 13 shows a front view of a fan blade 100 according to an embodiment of the present invention, the arrow a indicates the radial direction of the hub 110, and the arrow f indicates the circumferential direction of the hub 110.

[0124] In this embodiment, in the circumferential direction of the hub 110, the size of the hollow region 1206 formed surrounded by the inner annular surface 1208 of the blade 120 is L2. When observing the fan blade 100 along the axial direction of the hub 110, L2 is the length of the arc segment centered on the axis of the hub 110 in the hollow region 1206, and the size of L2 affects the width of the hollow region 1206.

[0125] Based on this, L2 needs to be greater than 5 mm. By limiting the above size range, it is possible to ensure that a sufficiently wide hollow region 1206 is provided inside the blade 120, thereby ensuring the noise reduction performance during the process of the blade 120 rotating at high speed, and further reducing the pneumatic noise of the fan blade 100 and improving the user experience.

[0126] As shown in FIG. 13, 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.

[0127] In this embodiment, in the circumferential direction of the hub 110, the size of the first section 122 is L1. When observing the fan blade 100 along 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. The arc segment is centered on the axis of the hub 110, and the size of L1 affects the width of the first section 122.

[0128] Based on this, in the direction from the root 1202 of the blade 120 to the end 1204 of the blade 120, L1 gradually decreases, that is, the width of the first section 122 gradually decreases in the direction away from the hub 110, and the first section 122 is sharp. By limiting the shape of the first section 122, it is possible to ensure the noise reduction performance during the process of the blade 120 rotating at high speed, and further reduce the pneumatic noise of the fan blade 100 and improve the user experience.

[0129] As shown in FIGS. 14 and 15, in some embodiments of the present invention, optionally, the blade 120 is cut by an annular surface centered on the axis of the hub 110 to obtain a cross-section 128 of the blade 120, and the outer contour of the cross-section 128 includes a first smooth curve 1282 protruding outward and a second smooth curve 1284 recessed inward.

[0130] FIG. 14 shows a structural schematic diagram of a fan blade 100 according to an embodiment of the present invention. The arrow b in FIG. 14 indicates the first rotation direction of the fan blade 100, and the arrow g indicates an annular surface centered on the axis of the hub 110.

[0131] FIG. 15 shows a schematic diagram of a cross-section 128 of a fan blade 100 according to an embodiment of the present invention. The cross-section 128 is developed into a plane after being cut. The arrow b indicates the first rotation direction of the fan blade 100, and the arrow c indicates the axial direction of the hub 110.

[0132] In this embodiment, the shape of the blade 120 is limited. Specifically, any region of the blade 120 is cut by an annular surface centered on the axis of the hub 110 to obtain a cross-section 128 of the blade 120. The outer contour of the cross-section 128 of the blade 120 includes a single first smooth curve 1282 protruding outward and a single second smooth curve 1284 recessed inward, and the combination of the first smooth curve 1282 and the second smooth curve 1284 forms the outer contour of the cross-section 128 of the blade 120.

[0133] As shown in FIGS. 9, 10, 11, and 12, by limiting the shape of the cross-section 128 of the blade 120, taking as an example that the blade 120 maintains a torsional tendency throughout and both ends of the blade 120 are connected to the circumferential side surface of the hub 110, the first end of the blade 120 first exposes the outer annular surface 1209. 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 torsion. When it is twisted to the end 1204, the inversion of the outer annular surface 1209 is completed. Then, the inner annular surface 1208 is 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 with the torsional tendency. The reverse is also true, that is, the strip-shaped blade 120 is continuously twisted during one revolution.

[0134] FIG. 9 shows a structural schematic diagram of a fan blade 100 according to an embodiment of the present invention.

[0135] FIG. 10 is a partial enlarged view of region A of the fan blade 100 of the embodiment shown in FIG. 9.

[0136] FIG. 11 shows a structural schematic diagram of a fan blade 100 according to an embodiment of the present invention.

[0137] FIG. 12 is a partial enlarged view of region B of the fan blade 100 of the embodiment shown in FIG. 11.

[0138] By limiting the shape of the cross-section 128 of the blade 120, it is possible to avoid the appearance of sharp change points in the shape of the blade 120. Thereby, on the one hand, the noise reduction performance during the high-speed rotation of the blade 120 is ensured, and further, the air pressure noise of the fan blade 100 is reduced, realizing the technical effect of improving the user experience. On the other hand, the resistance of the blade 120 is reduced, and the energy efficiency ratio of the air supply device 200 is improved.

[0139] As shown in FIGS. 14 and 15, in some embodiments of the present invention, optionally, the fan blade 100 is configured to rotate about a first rotation direction, and in the first rotation direction, the second smooth curve 1284 is located in front of the first smooth curve 1282.

[0140] In this embodiment, the standard rotation direction of the fan blade 100 is the first rotation direction, and the rotation direction during the actual use process may be the same as the standard rotation direction or opposite to the standard rotation direction.

[0141] Based on this, in the first rotation direction, the second smooth curve 1284 is located in front of the first smooth curve 1282. During the process of the fan blade 100 rotating around the standard 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.

[0142] By limiting the relationship between the shape of the blade 120 and the rotation direction, the noise reduction performance of the blade 120 is optimized, the noise reduction effect during the process of the blade 120 rotating at high speed is optimized, and thereby the user experience can be improved.

[0143] As shown in FIGS. 2 and 7, in some embodiments of the present invention, optionally, the number of blades 120 is plural, and the plural blades 120 surround the hub 110 and are uniformly distributed.

[0144] In this embodiment, the number of blades 120 is plural, and the plural blades 120 are uniformly distributed around the hub 110 around the axis of the hub 110. That is, the included angle between two adjacent blades 120 among the plural blades 120 is equal.

[0145] Specifically, the number of blades 120 is 3 or more.

[0146] By providing a plurality of blades 120 that are uniformly distributed, it is possible to improve the air supply intensity and air supply uniformity of the fan blade 100 without changing the rotational 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.

[0147] As shown in FIGS. 16 and 17, in one specific embodiment of the present invention, the front half of the blade 120 has a single blade structure, the rear half of the blade 120 has an annular structure, and a hollow region 1206 surrounded by the inner annular surface 1208 of the blade 120 is formed.

[0148] FIG. 16 shows a schematic structural diagram of a fan blade 100 according to an embodiment of the present invention.

[0149] FIG. 17 shows a schematic structural diagram of a fan blade 100 according to an embodiment of the present invention.

[0150] As shown in FIG. 18, in one specific embodiment of the present invention, the fan blade 100 further includes a wind guiding ring 130. The wind guiding ring 130 divides the blade 120. The blade 120 outside the wind guiding ring 130 is annular, and the blade 120 inside the wind guiding ring 130 is in a single blade shape, thereby optimizing the aerodynamic performance of the fan blade 100.

[0151] FIG. 18 shows a schematic structural diagram of a fan blade 100 according to an embodiment of the present invention.

[0152] As shown in FIG. 19, in one specific embodiment of the present invention, the fan blade 100 further includes a second blade 129. The second blade 129 has a single blade structure. A plurality of second blades 129 and a plurality of annular blades 120 are alternately provided, thereby optimizing the aerodynamic performance of the fan blade 100.

[0153] FIG. 19 shows a schematic structural diagram of a fan blade 100 according to an embodiment of the present invention.

[0154] As shown in FIG. 20, the second aspect of the present invention provides an air supply device 200, which includes the fan blade 100 of any of the above embodiments and a driving member 210 connected to the hub 110 and used to drive the fan blade 100 to rotate.

[0155] FIG. 20 shows a structural schematic diagram of an air supply device 200 according to an embodiment of the present invention.

[0156] In this embodiment, the air supply device 200 including the fan blade 100 of any of the above embodiments is defined. The air supply device 200 includes a floor fan, a heat dissipation fan, an exhaust fan, etc. Therefore, the air supply device 200 has the advantages of the fan blade 100 of any of the above embodiments and can achieve the technical effects that the fan blade 100 of any of the above embodiments can achieve. To avoid duplication, it will not be described repeatedly here.

[0157] Based on this, the air supply device 200 further includes a driving member 210. The driving member 210 is connected to the hub 110 of the fan blade 100 and is used to drive the hub 110 and the blade 120 to rotate synchronously after being energized.

[0158] Specifically, the driving member 210 includes a motor, and the rotating shaft of the motor is inserted into the hub 110, thereby driving the hub 110 and the blade 120 to rotate.

[0159] In the claims, specification, and drawings of the present invention, the term "plurality" means two or more. Unless otherwise specifically limited, the orientation or positional relationship indicated by terms such as "upper" and "lower" is the orientation or positional relationship shown based on the drawings, and is merely for facilitating the description of the present invention and simplifying the description process. It does not indicate or imply that the indicated device or element necessarily has a specific orientation and is configured and operated in a specific orientation. Therefore, these descriptions should not be understood as limitations on the present invention. The terms "connection", "attachment", "fixation", etc. should be understood to have a broad meaning. For example, "connection" may be a fixed connection between multiple objects, a removable connection between multiple objects, or an integral connection, may be a direct connection between multiple objects, or may be a connection through an intermediate medium between multiple objects. A person skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific situation of the above data.

[0160] In the claims, specification, and drawings of the present invention, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean 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 exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. And the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in an appropriate manner.

[0161] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. A person skilled in the art can make various changes and modifications to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should all be included within the protection scope of the present invention.

[0162] In FIGS. 1 to 20, the correspondence between the reference signs and the names of the members is as follows.

Description of Symbols

[0163] 100 fan blade, 110 hub, 120 blade, 1202 root, 1204 tip, 1206 hollow region, 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 air guiding ring, 200 air supply device, 210 driving member.

Claims

1. Comprising a hub and blades, wherein the blades are connected to the circumferential side surface of the hub, the blades are annular, a hollow region is formed surrounded by the inner annular surface of the blades, or a hollow region is formed surrounded by the inner annular surface of the blades and the circumferential side surface of the hub, In the radial direction of the hub, one end of the blade in contact with the hub is the root of the blade, and one end on the side far from the hub is the end of the blade, In the direction from the end to the root, at least a part 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 in direction at the end, and the first inner annular surface and the first outer annular surface on both sides of the end do not shield each other, A fan blade characterized by the above.

2. 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 fan blade, In the radial direction of the hub, the length of the first section is d1, d0 and d1, Satisfy the relational expression 0.01×d0≤d1≤0.2×d0, The fan blade according to claim 1, characterized by the above.

3. The blade further includes a second section, and the second section includes a second inner annular surface and a second outer annular surface, The blade further includes a third section, and 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, In the axial direction of the hub, the second inner annular surface and the first inner annular surface are not shielded, the third outer annular surface and the first outer annular surface are not shielded, or the third inner annular surface and the first inner annular surface are not shielded, and the second outer annular surface and the first outer annular surface are not shielded, The fan blade according to claim 1, characterized by the above.

4. 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 fan blade, In the radial direction of the hub, the length of the second section is d2, d0 and d2, Satisfy the relational expression 0<d2<0.1×d0, The fan blade according to claim 3, characterized by the above.

5. 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, The fan blade according to claim 3, characterized in that...

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

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

8. 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 gradually decreases, The fan blade according to any one of claims 1 to 5, characterized in that...

9. By cutting the blade with an annular surface having the axis of the hub as the axis, a cross-section of the blade is obtained, The outer contour of the cross-section includes a first smooth curve protruding outward and a second smooth curve recessed inward, The fan blade according to any one of claims 1 to 5, characterized in that...

10. 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, The fan blade according to claim 9, characterized in that...

11. The number of the blades is plural, The plural blades surround the hub and are uniformly distributed, The fan blade according to any one of claims 1 to 5, characterized in that...

12. The fan blade according to claim 1, and A drive member connected to the hub and configured to drive the fan blade to rotate, An air supply device, characterized in that...

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