Fan blade and blowing device

Abstract

The utility model discloses a fan blade and an air blowing device, and the fan blade comprises a hub which is provided with an annular side wall; the multiple blades are distributed in the circumferential direction of the annular side wall of the hub in a surrounding mode and extend in the radial direction of the annular side wall in a radial mode. Each blade in the multiple blades is perpendicular to at least one side edge of the air inlet direction of the fan blade to form an air cutting face, and the air cutting face extends in the direction opposite to the rotating direction of the fan blade. Compared with the prior art, the end portion of the wind cutting face is sharper, when the fan blade rotates, the fan blade can better cut airflow, resistance of the fan blade in the rotating process is reduced, and the rotating efficiency of the fan blade is higher.

Description

Technical Field

[0001] The present application relates to the field of fans, and in particular to a fan blade and a blowing device. Background Art

[0002] In the hot summer, fans have become a must-have item for people to eliminate the heat. With the improvement of people's quality of life, the requirements for various performances of fan products, such as noise, air volume, etc., are getting higher and higher.

[0003] As the core component of the fan, the fan blade plays a vital role in the overall performance of the fan. The fan blade in the prior art mainly consists of a hub and blades arranged on the surface of the hub. The inventor of the present invention found in the research that the blades of the fan blades in the prior art are rounded and blunted at their edges. When the fan blades rotate, the rounded and blunt sides receive greater wind resistance and generate greater noise. Utility Model Content

[0004] The purpose of the present application is to provide a fan blade and a blowing device that can reduce the wind resistance of the fan blade rotation and reduce the fan blade noise.

[0005] The present application provides a fan blade, comprising:

[0006] a wheel hub, the wheel hub being configured with an annular sidewall;

[0007] A plurality of blades, wherein the plurality of blades are distributed around the circumference of the annular side wall of the hub and extend radially along the radial direction of the annular side wall;

[0008] Each of the plurality of blades is perpendicular to at least one side of the fan blade in the air inlet direction and is configured to form a wind cutting surface, and the wind cutting surface extends in the opposite direction to the rotation direction of the fan blade.

[0009] Optionally, each of the blades comprises: a first cutting wind surface and a second cutting wind surface, and each of the blades has two sides perpendicular to the air inlet direction of the fan blade, and are respectively configured as the first cutting wind surface and the second cutting wind surface, and the first cutting wind surface and the second cutting wind surface respectively extend in the opposite direction of the rotation direction of the fan blade; and / or,

[0010] Each of the blades comprises: a blade tip and a blade tail, wherein the blade tip is located at the end of the suspended end of the first wind-cutting surface, and the blade tail is located at the end of the suspended end of the second wind-cutting surface, and along the direction from the blade tip to the blade tail, the cross section of each blade is configured to be shuttle-shaped; and / or,

[0011] Each of the blades extends obliquely along the outer surface of the annular side wall; and / or,

[0012] The wheel hub further comprises an end face, wherein the end face is connected to one end of the annular side wall, and the end face and the annular side wall enclose a receiving cavity of the wheel hub.

[0013] Optionally, the first wind cutting surface includes: a first curved portion and a second curved portion, and the first curved portion and the second curved portion have opposite bending directions.

[0014] Optionally, one end of the first curved portion is connected to the annular side wall, the other end of the first curved portion is connected to the second curved portion, and the connecting position of the first curved portion and the second curved portion is smoothly transitioned; and / or,

[0015] The first curved portion bulges outward to form an outer curved portion, and the second curved portion is recessed inward to form an inner curved portion.

[0016] Optionally, along the radial extension direction of each blade, the width of the second wind-cutting surface gradually increases.

[0017] Optionally, each blade includes: a windward surface and a leeward surface, the windward surface and the leeward surface are staggered with each other in the air inlet direction of the fan blade, the first tangential surface and the second tangential surface are respectively connected to the windward surface and the leeward surface, and the first tangential surface and the second tangential surface are both inclined planes.

[0018] Optionally, along the wind inlet direction of each blade, the height of the leeward surface is greater than the height of the windward surface; and / or,

[0019] The angle between the leeward surface and the first wind-cutting surface is greater than 90°, and the angle between the windward surface and the portion of the second wind-cutting surface away from the annular side wall is greater than 90°; and / or,

[0020] Along the direction from the blade tip to the blade tail, in the cross section of each blade, the bulging curvature of the leeward surface is greater than the bulging curvature of the windward surface.

[0021] Optionally, the end surface is configured in a truncated cone shape, the top end of the end surface is recessed toward the inside of the accommodating cavity to form a circular groove, and a glue injection port is provided in the circular groove; and / or,

[0022] A plurality of leveling grooves are formed on a surface of the annular side wall facing the accommodating cavity, and the plurality of leveling grooves are arranged around the annular side wall at equal intervals.

[0023] Optionally, the plurality of leveling grooves are all in communication with the accommodating cavity, and the plurality of leveling grooves and the motor accessories mounted in the accommodating cavity are together enclosed to form a leveling space.

[0024] To achieve the purpose of the present application, an embodiment of the present application further provides a blowing device, which is assembled with fan blades as described in any one of the above items.

[0025] The beneficial effect of the embodiment of the present application is that at least one side of the fan blade that is perpendicular to the air inlet direction is constructed as a cutting surface, and the cutting surface extends in the opposite direction of the rotation direction of the fan blade. The end of the cutting surface is sharper, and when the fan blade rotates, the fan blade can better cut the airflow, reduce the resistance of the fan blade during the rotation process, and make the rotation efficiency of the fan blade higher. At the same time, because the cutting surface extends in the opposite direction of the rotation direction of the fan blade, the blade can have a better guiding effect on the airflow flowing through the surface of the fan blade, so that the airflow is separated from the blade of the fan blade at a larger angle, reducing the noise generated by the side and the airflow. And because it extends in the opposite direction to the rotation direction of the fan blades, when the wind cutting surface is located on the air inlet side of the fan blades, the airflow can be guided to the inside of the fan blades, thereby improving the air intake efficiency of the fan blades; when the wind cutting surface is located on the air outlet side of the fan blades, it can avoid the airflow flowing out of the fan blades from being guided toward the inside of the fan blades, thereby avoiding convection between the outflowing airflow and the airflow inside the fan blades, greatly improving the air outlet efficiency of the fan blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0027] Figure 1 This is a schematic diagram of the three-dimensional structure of a fan blade according to a specific embodiment of the present application;

[0028] Figure 2 This is a schematic structural diagram of a first perspective of a specific embodiment of the present application;

[0029] Figure 3 A schematic structural diagram of a fan blade from a second perspective of a specific embodiment of the present application;

[0030] Figure 4 This is a schematic structural diagram of a blade cross section of a specific embodiment of the present application.

[0031] Description of the drawings: 1. Fan blades; 11. Hub; 111. Annular side wall; 112. End face; 113. Circular groove; 114. Leveling groove; 12. Blade; 121. Wind-cutting surface; 121a. First wind-cutting surface; 121b. Second wind-cutting surface; 121c. First curved portion; 121d. Second curved portion; 122. Blade tip; 123. Blade tail; 124. Windward side; 125. Leeward side; 13. Accommodating cavity. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the utility model, the utility model is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements between them. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements between them. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by technicians in the technical field of the present invention. The terms used in this specification are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0034] Example 1

[0035] See also Figure 1 and Figure 2 , Figure 1 is a schematic diagram of the three-dimensional structure of the fan blades of this embodiment; Figure 2 It is a structural schematic diagram of the fan blades of this embodiment from a first perspective.

[0036] like Figure 1 and Figure 2 As shown, a fan blade 1 comprises: a hub 11 and a plurality of blades 12. The hub 11 is configured with an annular side wall 111; the plurality of blades 12 are distributed around the circumference of the annular side wall 111 of the hub 11, and extend radially along the radial direction of the annular side wall 111; each of the plurality of blades 12 is perpendicular to at least one side edge of the air inlet direction C2 of the fan blade 1, and is configured to form a wind-cutting surface 121, and the wind-cutting surface 121 extends in the opposite direction of the rotation direction C1 of the fan blade 1.

[0037] The end surface 112 of the hub 11 in this embodiment can be configured as (but not limited to): a circular plane, a hemispherical shape, a conical surface or a truncated cone shape. The end surface 112 and the annular side wall 111 are connected to form a complete hub 11.

[0038] In this embodiment, the number of the fan blades 12 is 12. However, the number of the blades 12 is not limited thereto, and according to different specific application scenarios, in some embodiments, the number of the blades 12 can be (not limited to): 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14 or more.

[0039] In this embodiment, the blade 12 has two sides perpendicular to the air inlet direction C2 of the fan blade 1, which are respectively distributed on the air inlet side and the air outlet side of the fan blade 1. The wind-cutting surface 121 is distributed on the side of the blade 12 on the air inlet side. However, the distribution of the wind-cutting surface 121 is not limited to this. According to different specific application scenarios, in some embodiments, the wind-cutting surface 121 is arranged on the side of the blade 12 on the air outlet side; in some embodiments, the wind-cutting surface 121 is distributed on the side of the blade 12 on the air inlet side and on the side on the air outlet side.

[0040] In this embodiment, extension in the opposite direction means that: the wind cutting surface 121 extends along one side of the blade 12 to the opposite side, until the side corner in the extension direction is tilted; or, the wind cutting surface 121 extends along one side of the blade 12 to the opposite side, until the side corner in the opposite direction of the extension direction is tilted.

[0041] In the above embodiment, at least one side of the fan blade 1 perpendicular to the air inlet direction C2 is configured as a cutting surface 121, and the cutting surface 121 extends in the opposite direction of the rotation direction C1 of the fan blade 1. The end of the cutting surface 121 is sharper, so that the fan blade 1 can better cut the airflow when the fan blade 1 rotates, reducing the resistance of the fan blade 1 during the rotation process, and making the rotation efficiency of the fan blade 1 higher. At the same time, because the cutting surface 121 extends in the opposite direction of the rotation direction C1 of the fan blade 1, the blade 12 can have a better guiding effect on the airflow flowing through the surface of the fan blade 1, so that the airflow is separated from the blade 12 of the fan blade 1 at a larger angle, thereby reducing the noise generated by the side and the airflow. And because it extends in the opposite direction to the rotation direction C1 of the fan blade 1, when the wind cutting surface 121 is located on the air inlet side of the fan blade 1, the air flow can be guided to the inside of the fan blade 1, thereby improving the air inlet efficiency of the fan blade 1; when the wind cutting surface 121 is located on the air outlet side of the fan blade 1, it can avoid the air flow flowing out of the fan blade 1 from being guided toward the inside of the fan blade 1, thereby avoiding convection between the outflowing airflow and the airflow inside the fan blade 1, thereby greatly improving the air outlet efficiency of the fan blade 1.

[0042] In some embodiments, each blade 12 includes: a first wind-cutting surface 121a and a second wind-cutting surface 121b, and each blade 12 has two side edges perpendicular to the air inlet direction C2 of the fan blade 1, which are respectively configured as the first wind-cutting surface 121a and the second wind-cutting surface 121b, and the first wind-cutting surface 121a and the second wind-cutting surface 121b extend respectively in the opposite direction of the rotation direction C1 of the fan blade 1. In this embodiment, two wind-cutting surfaces 121 are provided, namely the first wind-cutting surface 121a and the second wind-cutting surface 121b. Among them, the first wind-cutting surface 121a is provided on the side edge of the air inlet side of the blade 12, and the second wind-cutting surface 121b is provided on the side edge of the air outlet side of the blade 12.

[0043] A first cutting wind surface 121a and a second cutting wind surface 121b are provided. The end of the first cutting wind surface 121a is sharper, and when the fan blade 1 rotates, the fan blade 1 can better cut the airflow, reduce the resistance of the fan blade 1 during the rotation process, make the rotation efficiency of the fan blade 1 higher, and can guide the airflow to the inside of the fan blade 1, thereby improving the air intake efficiency of the fan blade 1. The second cutting wind surface 121b enables the blade 12 to have a better guiding effect on the airflow flowing through the surface of the fan blade 1, so that the airflow is separated from the blade 12 of the fan blade 1 at a larger angle, reducing the noise generated by the side and the airflow, and can avoid the airflow flowing out of the fan blade 1 from being guided to the inside of the fan blade 1, thereby avoiding convection between the outflowing airflow and the airflow inside the fan blade 1, and greatly improving the air outlet efficiency of the fan blade 1. At the same time, since the first cutting wind surface 121a and the second cutting wind surface 121b both extend in the opposite direction of the rotation direction C1 of the fan blade 1, the blade 12 can have a better guiding effect on the airflow flowing through the surface of the fan blade 1, so that the airflow can separate from the blade 12 of the fan blade 1 at a larger angle, thereby reducing the noise generated by the side and the airflow.

[0044] See also Figure 3 , Figure 3 It is a structural schematic diagram of the fan blades of this embodiment from a second viewing angle.

[0045] like Figure 3As shown, in some embodiments, the first wind-cutting surface 121a includes: a first curved portion 121c and a second curved portion 121d, and the bending directions of the first curved portion 121c and the second curved portion 121d are opposite. The arrangement of the first curved portion 121c and the second curved portion 121d can make the first wind-cutting surface 121a always only partially contact the airflow to be cut when the fan blade 1 rotates, and then drive more subsequent surfaces to cut the air, which can further reduce the resistance of the airflow. At the same time, cutting the air with low resistance can also reduce the noise generated when cutting the wind. The structure in which the first curved portion 121c and the second curved portion 121d have opposite bending directions makes the area of ​​the wind-cutting surface 121 of the first curved portion 121c gradually increase while the area of ​​the wind-cutting surface 121 of the second curved portion 121d gradually decreases; or vice versa. This structure can keep the area of ​​the first wind cutting surface 121a consistent when cutting wind, avoiding the vibration of the blade 12 in the changing resistance due to the rapid change of the cutting area, and further reducing the rotational resistance and noise of the fan blade 1.

[0046] In some embodiments, one end of the first curved portion 121c is connected to the annular side wall 111, and the other side of the first curved portion 121c is connected to the second curved portion 121d, and the connecting position of the first curved portion 121c and the second curved portion 121d is smoothly transitioned. The smooth transition between the first curved portion 121c and the second curved portion 121d avoids the problem of uneven force on the blade 12 due to a non-smooth transition, and further reduces the wind resistance and noise received by the fan blade 1.

[0047] However, the positional relationship between the first curved portion 121c and the second curved portion 121d is not limited to that, and according to different specific application scenarios, in some embodiments, one end of the second curved portion 121d is connected to the annular side wall 111, and the other end of the second curved portion 121d is connected to the first curved portion 121c. The other end of the first curved portion 121c is suspended.

[0048] In some embodiments, the first curved portion 121c bulges outward to form an outer curved portion, and the second curved portion 121d is recessed inward to form an inner curved portion. In combination with the relative positional relationship between the first curved portion 121c and the second curved portion 121d, although the two have the same angular velocity when rotating on the first wind cutting surface 121a, the linear velocity of the second curved portion 121d is greater than the linear velocity of the first curved portion 121c. The second curved portion 121d adopts an inward concave arc, so that its initial contact surface with the airflow is much smaller than the contact area of ​​the first curved portion 121c, so that the blade 12 can first cut the airflow with the first curved portion 121c. Since the linear velocity of the first curved portion 121c is smaller, it can make cutting relatively easier and the wind cutting sound generated is smaller.

[0049] In some embodiments, along the radial extension direction of each blade 12, the width of the second wind-cutting surface 121b gradually increases. The area of ​​the second wind-cutting surface 121b along the direction in which the blade 12 extends outward is getting wider and wider. Since the linear velocity of the first wind-cutting surface 121a moving along the direction in which it extends is getting faster and faster during the rotation of the fan blade 1, the larger the linear velocity is, the larger the area of ​​the second wind-cutting surface 121b extending is. This structure enables the second wind-cutting surface 121b to have a wider guiding area for the outflowing airflow at a position where the wind speed flows faster. Since, the faster the airflow velocity is, the lower the guiding efficiency of the unit area guiding structure for the airflow is, the structure in which the second wind-cutting surface 121b gradually widens can balance the guiding effect of the airflow at different linear velocities during the rotation process, so that the airflow outlet direction of the airflow outflowing from different positions of the fan blade 1 is kept consistent. While improving the air outlet efficiency of the fan blade 1, it can also reduce the airflow collision noise caused by inconsistent air outlet wind direction.

[0050] In some embodiments, each blade 12 includes: a windward surface 124 and a leeward surface 125, the windward surface 124 and the leeward surface 125 are staggered with each other in the air inlet direction C2 of the fan blade 1, the first cut wind surface 121a and the second cut wind surface 121b are respectively connected to the windward surface 124 and the leeward surface 125, and the first cut wind surface 121a and the second cut wind surface 121b are both inclined planes.

[0051] The windward surface 124 refers to the surface of the blade 12 that contacts the airflow head-on during the rotation of the fan blade 1, while the leeward surface 125 is the surface opposite to the windward surface 124. The windward surface 124 and the leeward surface 125 are displaced from each other, so that there is a position difference between the windward surface 124 and the leeward surface 125. The position difference makes the first wind-cutting surface 121a and the second wind-cutting surface 121b have an inclined trend, and finally forms an inclined plane with the first wind-cutting surface 121a and the second wind-cutting surface 121b. The inclined plane formed by the first wind-cutting surface 121a can make the first wind-cutting surface 121a sharper when cutting the wind, and cut the wind better. At the same time, the inclined surface can have a better guiding effect on the airflow entering the fan blade 1, so that the wind-guiding ability of the first wind-cutting surface 121a is stronger. The inclined plane formed by the second wind-cutting surface 121b can make it have a larger contact area with the airflow flowing out of the fan blade 1, thereby improving the wind-guiding ability of the second wind-cutting surface 121b.

[0052] In some embodiments, along the wind inlet direction C2 of each blade 12, the height of the leeward surface 125 is greater than the height of the windward surface 124. The height of the leeward surface 125 is greater than the height of the windward surface 124, so that the height of the leeward surface 125 on the wind outlet side of the fan blade 1 is greater than the height of the windward surface 124 on that side, and the height of the leeward surface 125 on the wind inlet side of the fan blade 1 is also higher than the height of the windward surface 124 on that side. This structure allows the first wind-cutting surface 121a to extend upward when extending from the windward surface 124 to the leeward surface 125. This structure enables the first wind-cutting surface 121a to guide the airflow to the inside of the fan blade 1 when guiding the airflow, thereby improving the air intake efficiency of the fan blade 1. Similarly, on the wind outlet side of the fan blade 1, the height of the leeward surface 125 is still greater than the windward surface 124. This structure allows the second wind-cutting surface 121b to extend upward as well. The upward extending structure enables the second wind cutting surface 121b to guide the airflow flowing out of the fan blade 1 in an oblique upward direction, thereby reducing the lateral rotational kinetic energy of the outflowing airflow and enhancing the kinetic energy along the air outlet direction of the fan blade 1, thereby making the air outlet efficiency of the fan blade 1 higher, and the wind force surface is more concentrated in the air outlet direction, resulting in a better blowing effect.

[0053] See also Figure 4 , Figure 4 Schematic diagram of the structure of the blade cross section of this embodiment.

[0054] like Figure 4 As shown, in some embodiments, the angle θ1 between the leeward surface 125 and the first wind-cutting surface 121a is greater than 90°, and the angle θ2 between the windward surface 124 and the portion of the second wind-cutting surface 121b away from the annular side wall 111 is greater than 90°.

[0055] The angle θ1 between the leeward surface 125 and the first wind-cutting surface 121a is greater than 90°, so that the angle θ1 between the leeward surface 125 and the first wind-cutting surface 121a is an obtuse angle. This structure enables the first wind-cutting surface 121a to guide the airflow from the windward surface 124 to the leeward surface 125 at a more gentle angle, thereby improving the airflow guiding effect and enhancing the air intake efficiency of the fan blade 1.

[0056] The angle θ2 between the windward surface 124 and the portion of the second wind-cutting surface 121b away from the annular side wall 111 is greater than 90°. The angle θ2 between the partial structure of the second wind-cutting surface 121b and the windward surface 124 is made obtuse. This structure can make the airflow of the local convection of the second wind-cutting surface 121b outflowing the fan blade 1 more smoothly, reduce the noise on the wind outlet side of the fan blade 1, and make the air outlet efficiency of the fan blade 1 higher.

[0057] In some embodiments, each blade 12 includes: a blade tip 122 and a blade tail 123, wherein the blade tip 122 is located at the end of the suspended end of the first wind-cutting surface 121a, and the blade tail 123 is located at the end of the suspended end of the second wind-cutting surface 121b, and the cross section of each blade 12 along the direction from the blade tip 122 to the blade tail 123 is configured in a shuttle shape. Along the direction from the blade tip 122 to the blade tail 123, the cross section of each blade 12 is configured in a shuttle shape, and the shuttle structure enables the blade 12 to better cut the air on the wind inlet side, and in the process of first changing from small to large and then from large to small, the air inlet channel formed by two adjacent blades 12 can pressurize and release the airflow entering therein, thereby increasing the flow rate of the airflow and making the wind pressure of the fan blade 1 greater. Structurally speaking, the widening of the blade 12 in a local area can make the physical structure of the blade 12 more stable, less likely to vibrate under the action of external force, and reduce the noise of the fan blade 1.

[0058] In some embodiments, along the direction from the blade tip 122 to the blade tail 123, the bulge of the leeward surface 125 in the cross section of each blade 12 is greater than the bulge of the windward surface 124. From the positional relationship, the windward surface 124 is located above the leeward surface 125. During the rotation of the fan, due to the difference in radian, the air flow speed flowing through the blade 12 is also different. According to the principles of aerodynamics, this radian difference will cause the fan blade 1 to generate lift along the wind outlet direction during the rotation process. The generation of lift can offset the gravity exerted on the fan blade 1, thereby reducing the interaction force between the fan blade 1 and its associated connection structure (not shown), reducing the physical friction when the fan blade 1 rotates, and making the fan blade 1 rotate more efficiently.

[0059] In some embodiments, each blade 12 extends obliquely along the outer surface of the annular side wall 111. The oblique extension enables the blade 12 to cut the air better and also enables the airflow passing through the fan blade 1 to flow more smoothly.

[0060] However, the extension of the blade 12 on the outer surface of the annular side wall 111 is not limited to this. Depending on the specific application scenario, in some embodiments, the extension of the blade 12 on the outer surface of the annular side wall 111 can also be (not limited to): vertical extension, spiral extension or curved extension.

[0061] In some embodiments, the hub 11 further includes: an end surface 112, the end surface 112 is connected to one end of the annular side wall 111, and the end surface 112 and the annular side wall 111 enclose a receiving cavity 13 of the hub 11. The hub 11 with the end surface 112 can prevent the airflow from entering the annular side wall 111 and forming a vortex after the annular side wall 111 rotates, thereby affecting the air intake efficiency of the fan blade 1. Therefore, the provision of the end surface 112 can improve the air intake efficiency of the fan blade 1.

[0062] The end face 112 is configured in a truncated cone shape, and the top end of the end face 112 is recessed into the accommodating cavity 13 to form a circular groove 113. The end face 112 of the hub 11 is configured in a truncated cone shape. Since the top end surface 112 of the truncated cone structure has a large area, it is not easy for an airflow vortex to form at the top end of the cone when the fan blade 1 rotates. The formation of the airflow vortex will form a negative pressure area on the air inlet side of the fan blade 1, and the negative pressure area will interfere with the airflow entering the fan blade 1, thereby reducing the air intake efficiency of the fan blade 1. Therefore, configuring the end face 112 in a truncated cone shape can improve the air intake efficiency of the fan blade 1.

[0063] The top of the end surface 112 is inwardly recessed to form a circular groove 113. The structure of the circular groove 113 can further interfere with the airflow vortex generated at the corresponding position of the top of the hub 11 when the fan blade 1 rotates. At the same time, the structure of the circular groove 113 can be used for glue injection during the manufacturing process of the fan blade 1. The glue injection port formed by the glue injection will be hidden in the circular groove 113 instead of being formed on the surface of the hub 11 or the surface of the blade 12. Therefore, this structure can make the surface of the fan blade 1 smoother and more in line with the principle of aerodynamics, so that the blowing efficiency of the fan blade 1 is higher.

[0064] In this embodiment, the end face 112, the annular side wall 111 and the blade 12 are manufactured by an integrated molding technology. However, the connection method between the three is not limited to this. According to different specific application scenarios, in some embodiments, the connection method between the annular side wall 111 and the end face 112, and between the annular side wall 111 and the blade 12 is (not limited to): hot melt connection, adhesive connection, clamping connection, screw connection, etc.

[0065] In some embodiments, a plurality of leveling grooves 114 are formed on a surface of the annular side wall 111 facing the accommodating cavity 13, and the plurality of leveling grooves 114 are arranged around the accommodating cavity 13 at equal intervals. The number of the leveling grooves 114 can be any integer greater than or equal to 2.

[0066] A leveling groove 114 is provided on the inner surface of the annular side wall 111, which reasonably utilizes the space resources in the accommodating cavity 13, and does not expose the leveling groove 114 on the outer surface of the hub 11, thereby improving the smoothness of the outer surface of the hub 11, making the resistance of the fan blade 1 smaller when rotating, and improving the air outlet efficiency. At the same time, the balance filler (not shown) placed inside the inner surface of the annular side wall 111 will be supported by the annular side wall 111 when the fan blade 1 rotates, and will not be separated from the hub 11 under the action of the centrifugal force generated by the rotation of the fan blade 1. The stability of the rotation of the fan blade 1 is improved, and the damage to the fan blade 1 that may be caused by the falling off of the balance filler is avoided, thereby improving the safety of the fan blade 1.

[0067] In some embodiments, the plurality of leveling grooves 114 are all in communication with the accommodating cavity 13 , and the plurality of leveling grooves 114 and the motor accessories assembled in the accommodating cavity 13 are together enclosed to form a leveling space.

[0068] The interior of the accommodating chamber 13 is used to install motor accessories, for example, the magnetic ring of the fan motor or the magnetic ring and the metal ring sleeved on the magnetic ring. The leveling groove 114 is connected to the adjacent side wall in the annular side wall 111, so that the side wall of the leveling groove 114 next to the motor accessory is missing, and since the motor accessory and the inner surface of the annular side wall 111 are usually tightly fitted with an interference fit. Therefore, the motor accessory is used as a supplement to the missing side wall of the leveling groove 114 to complete the leveling groove 114. This structure cleverly utilizes the relative relationship between the accommodating chamber 13 and the motor accessory, simplifies the structure of the leveling groove 114, saves the space loss caused by setting a complete leveling groove 114, makes the hub 11 structure more compact and exquisite, and improves the space utilization efficiency of the fan blade 1.

[0069] It should be noted that any implementation in this embodiment can be implemented independently or in combination with one or more other implementations. When implemented in combination, the combination method should not be limited to the combination methods listed in this embodiment.

[0070] Example 2

[0071] A blowing device comprises the fan blade 1 in Example 1, wherein the fan blade 1 serves as a core module component for assembling the blowing device.

[0072] It should be noted that the blowing device in this embodiment includes (but is not limited to): bladeless fans, desktop fans, floor fans, spherical fans, neck fans, handheld fans, industrial fans, air conditioners, hair dryers and other products that need to promote air circulation. The fan blades 1 in Example 1 are assembled inside the shell of the above products.

[0073] The blowing device in this embodiment configures at least one side of the fan blade 1 perpendicular to the air inlet direction C2 into a cutting surface 121, and the cutting surface 121 extends in the opposite direction of the rotation direction C1 of the fan blade 1. The end of the cutting surface 121 is sharper, and when the fan blade 1 rotates, the fan blade 1 can better cut the airflow, reduce the resistance of the fan blade 1 during the rotation process, and make the rotation efficiency of the fan blade 1 higher. At the same time, because the cutting surface 121 extends in the opposite direction of the rotation direction C1 of the fan blade 1, the blade 12 can have a better guiding effect on the airflow flowing through the surface of the fan blade 1, so that the airflow is separated from the blade 12 of the fan blade 1 at a larger angle, reducing the noise generated by the side and the airflow. And because it extends in the opposite direction to the rotation direction C1 of the fan blade 1, when the wind cutting surface 121 is located on the air inlet side of the fan blade 1, the air flow can be guided to the inside of the fan blade 1, thereby improving the air inlet efficiency of the fan blade 1; when the wind cutting surface 121 is located on the air outlet side of the fan blade 1, it can avoid the air flow flowing out of the fan blade 1 from being guided toward the inside of the fan blade 1, thereby avoiding convection between the outflowing airflow and the airflow inside the fan blade 1, thereby greatly improving the air outlet efficiency of the fan blade 1.

[0074] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not intended to be additional limitations on the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all considered to be within the scope of the present invention; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the present application.

Claims

1. A fan blade, characterized in that: include: a wheel hub, the wheel hub being configured with an annular sidewall; A plurality of blades, wherein the plurality of blades are distributed around the circumference of the annular side wall of the hub and extend radially along the radial direction of the annular side wall; Each of the plurality of blades is perpendicular to at least one side of the fan blade in the air inlet direction and is configured to form a wind cutting surface, and the wind cutting surface extends in the opposite direction to the rotation direction of the fan blade.

2. The fan blade according to claim 1, characterized in that: Each blade comprises: a first cutting wind surface and a second cutting wind surface, and two sides of each blade are perpendicular to the air inlet direction of the fan blade, and are respectively configured as the first cutting wind surface and the second cutting wind surface, and the first cutting wind surface and the second cutting wind surface respectively extend in the opposite direction of the rotation direction of the fan blade; and / or, Each of the blades comprises: a blade tip and a blade tail, wherein the blade tip is located at the end of the suspended end of the first wind-cutting surface, and the blade tail is located at the end of the suspended end of the second wind-cutting surface, and along the direction from the blade tip to the blade tail, the cross section of each blade is configured to be shuttle-shaped; and / or, Each of the blades extends obliquely along the outer surface of the annular side wall; and / or, The wheel hub further comprises an end face, wherein the end face is connected to one end of the annular side wall, and the end face and the annular side wall enclose a receiving cavity of the wheel hub.

3. The fan blade according to claim 2, characterized in that: The first wind cutting surface includes: a first curved portion and a second curved portion, and the first curved portion and the second curved portion have opposite curved directions.

4. The fan blade according to claim 3, characterized in that: One end of the first curved portion is connected to the annular side wall, the other side of the first curved portion is connected to the second curved portion, and the connecting position of the first curved portion and the second curved portion is smoothly transitioned; and / or, The first curved portion bulges outward to form an outer curved portion, and the second curved portion is recessed inward to form an inner curved portion.

5. The fan blade according to claim 2, characterized in that: Along the radial extension direction of each blade, the width of the second wind-cutting surface gradually increases.

6. The fan blade according to claim 2, characterized in that: Each blade includes: a windward surface and a leeward surface, wherein the windward surface and the leeward surface are offset from each other in the air inlet direction of the fan blade, the first tangential surface and the second tangential surface are respectively connected to the windward surface and the leeward surface, and the first tangential surface and the second tangential surface are both inclined planes.

7. The fan blade according to claim 6, characterized in that: Along the wind inlet direction of each blade, the height of the leeward surface is greater than the height of the windward surface; and / or, The angle between the leeward surface and the first wind-cutting surface is greater than 90°, and the angle between the windward surface and the portion of the second wind-cutting surface away from the annular side wall is greater than 90°; and / or, Along the direction from the blade tip to the blade tail, in the cross section of each blade, the bulging curvature of the leeward surface is greater than the bulging curvature of the windward surface.

8. The fan blade according to claim 2, characterized in that: The end surface is configured in a truncated cone shape, the top end of the end surface is recessed toward the inside of the accommodating cavity to form a circular groove, and a glue injection port is provided in the circular groove; and / or, A plurality of leveling grooves are formed on a surface of the annular side wall facing the accommodating cavity, and the plurality of leveling grooves are arranged around the annular side wall at equal intervals.

9. The fan blade according to claim 8, characterized in that: The plurality of leveling grooves are all in communication with the accommodating cavity, and the plurality of leveling grooves and the motor accessories assembled in the accommodating cavity are together enclosed to form a leveling space.

10. A blowing device, characterized in that: The blowing device is assembled with the fan blades as described in any one of claims 1-9.

Images