Fan blade and air outlet device

Abstract

The utility model discloses a fan blade and an air outlet device, and relates to the technical field of air outlet equipment, the fan blade comprises a hub and at least two blades, the hub is used for being connected with a driving mechanism, and the hub is defined to be provided with an air inlet end and an air outlet end which are opposite to each other; the at least two blades are connected to the periphery of the hub at intervals, the projections of the blade roots and the blade tips of the blades on the center face of the hub in the first direction are defined as a first projection face and a second projection face respectively, and the first projection face and the second projection face are arranged in a staggered and inclined mode. The inclination angle of the first projection surface is larger than that of the second projection surface. The first projection plane is provided with a first wind-facing arc edge protruding towards the air inlet end, and the second projection plane is provided with a second wind-facing arc edge protruding towards the air inlet end. According to the technical scheme provided by the utility model, the structural arrangement of the fan blade is improved, the flow speed and the wind pressure loss of outlet air flow are reduced, and the practicability and the reliability of the fan blade are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air outlet equipment, in particular to a fan blade and an air outlet device. Background Art

[0002] In the related art, in air outlet devices such as fans and hair dryers, the smaller high-speed fan blades are mostly made in one piece using milling and other processing techniques, so that the blades can have a relatively stable and reliable overall structural strength to ensure the stable operation of the air outlet device.

[0003] However, most fan blades are processed and produced in a relatively straight blade structure to make the fan blades easier to process and produce. However, the relatively straight blade structure is easy to have a certain impact on the airflow when disturbing the airflow, resulting in poor airflow guidance effect of the blades, causing a certain impact on the airflow velocity and wind pressure, making the fan's air output effect poor, and reducing the practicality and reliability of the fan blades. Utility Model Content

[0004] The main purpose of the utility model is to propose a fan blade and an air outlet device, aiming to improve the structural setting of the fan blade, achieve a better guiding effect of the fan blade on the turbulent airflow, reduce the flow rate and wind pressure loss of the outlet airflow, and improve the practicality and reliability of the fan blade.

[0005] To achieve the above-mentioned purpose, the fan blade proposed by the utility model includes a hub and at least two blades, the hub is used to connect the driving mechanism, and the hub is defined to have a relative air inlet end and air outlet end; at least two of the blades are connected to the outer periphery of the hub at intervals, and the projections of the blade root and the blade tip along the first direction on the center plane of the hub are defined as the first projection plane and the second projection plane, respectively, the first projection plane and the second projection plane are staggered and inclined, and the inclination angle of the first projection plane is greater than the inclination angle of the second projection plane. The first projection plane is provided with a first windward arc edge protruding toward the air inlet end, and the second projection plane is provided with a second windward arc edge protruding toward the air inlet end.

[0006] In one embodiment, the angle between the center line of the first projection surface and the plane where the air outlet is located is defined as α, 38.5°≤α≤41.5°. The angle between the center line of the second projection surface and the plane where the air outlet is located is defined as β, 25.5°≤β≤28.5°.

[0007] In one embodiment, the number of the blades is eleven.

[0008] In one embodiment, the first projection surface is further provided with a first leeward arc edge protruding toward the wind outlet end, and the distance between the first leeward arc edge and the center line of the first projection surface is smaller than the distance between the first windward arc edge and the center line of the first projection surface. The second projection surface is further provided with a second leeward arc edge protruding toward the wind outlet end, and the distance between the second leeward arc edge and the center line of the second projection surface is smaller than the distance between the second windward arc edge and the center line of the second projection surface.

[0009] In one embodiment, the blade has a windward surface and a leeward surface opposite to each other, the windward surface is arranged toward the wind inlet end, and the leeward surface is arranged toward the wind outlet end. The blade also has a first side surface and a second side surface connecting the windward surface and the leeward surface, the first side surface is arranged close to the wind inlet end, the second side surface is arranged close to the wind outlet end, and the connection between the second side surface and the leeward surface is arranged at an angle.

[0010] In one embodiment, the first side surface is arranged in an arc-shaped protrusion, and the connection between the second side surface and the windward surface is arranged in an arc shape.

[0011] In one embodiment, the hub includes a guide section and a mounting section, the guide section is connected to the mounting section, at least two blades are spaced and connected to the outer circumference of the mounting section, and the width of the guide section along the second direction is configured to gradually increase from the air inlet end to the air outlet end.

[0012] In one embodiment, a first drainage surface and a second drainage surface are formed on the outer circumference of the guide section, the first drainage surface is arranged in an arc shape, and the second drainage surface is connected to the first drainage surface and is bent to connect to the mounting section.

[0013] In one embodiment, the length of the hub along the second direction is defined as H, the length of the guide section along the second direction is defined as h1, the length of the installation section along the second direction is defined as h2, 0.4≤h1 / H≤0.5, 0.5≤h2 / H≤0.6.

[0014] The utility model also provides an air outlet device, which includes a driving mechanism and a fan blade. The fan blade is the fan blade mentioned above, and the fan blade is connected to the driving mechanism.

[0015] The technical solution of the utility model is to make the first projection surface formed by the root of the blade and the second projection surface formed by the tip of the blade be inclined to the plane where the hub outlet end is located, and to make the inclination angle of the first projection surface greater than the inclination angle of the second projection surface, so that the root of the blade and the tip of the blade can be staggered in the first direction, so that the overall structure of the blade can be similar to the spiral curved plate structure, so that the side of the blade facing the hub inlet end has a certain arc-shaped wind-guiding effect, and compared with the straight blade structure, the flow blocking effect of the blade on the inlet airflow can be better reduced, and the wind loss of the inlet airflow can be better reduced. At the same time, the first side of the first projection surface facing the inlet end is convex to form a first windward arc edge, and the second side of the second projection surface facing the inlet end is convex to form a second windward arc edge, so that the spirally curved blade can further form an arc-shaped convex structure on the surface facing the inlet end, so that the inlet airflow can flow more smoothly along the surface of the blade when it contacts the blade, which is conducive to better reducing the impact of the inlet airflow and the fan blade, better reducing the loss of the inlet airflow, achieving a better high-speed blowing effect of the fan, and further improving the practicality and reliability of the fan blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 A schematic structural diagram of a fan blade embodiment provided by the utility model;

[0018] Figure 2 for Figure 1 A front view of a fan blade of an embodiment;

[0019] Figure 3 for Figure 1 A cross-sectional view of an embodiment of a fan blade;

[0020] Figure 4 for Figure 1 A schematic diagram of a blade embodiment in which a first projection surface and a second projection surface overlap on a hub center plane;

[0021] Figure 5 for Figure 1 A schematic diagram of a blade of an embodiment of the present invention in which a first projection surface is formed on a center plane of a hub;

[0022] Figure 6 for Figure 1 A schematic diagram of a blade embodiment in which a second projection surface is formed on a hub center plane;

[0023] Figure 7 An outlet airflow direction diagram obtained by testing in a simulation of an embodiment of a fan blade provided by the utility model;

[0024] Figure 8 A flow velocity distribution diagram of the air flow outlet of an embodiment of the fan blade provided by the present invention obtained by testing in a simulation.

[0025] Description of Figure Numbers:

[0026] 100, fan blade; 10, hub; 10a, center plane; 11, guide section; 111, first guide surface; 113, second guide surface; 13, mounting section; 30, blade; 30a, first projection surface; 31a, first windward arc edge; 33a, first leeward arc edge; 30b, second projection surface; 31b, second windward arc edge; 33b, second leeward arc edge; 31, windward surface; 33, leeward surface; 35, first side surface; 37, second side surface.

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0031] In the related art, in air outlet devices such as fans and hair dryers, the smaller-sized high-speed fan blades are mostly made in one piece using milling and other processing techniques, so that the blades can have a relatively stable and reliable overall structural strength to ensure the stable operation of the air outlet device. However, the fan blades are mostly processed and produced in the form of a relatively straight blade structure, so that the fan blades are easier to process and produce. However, the relatively straight blade structure is likely to cause a certain impact on the airflow when disturbing the airflow, resulting in a poor airflow guidance effect of the blades, causing a certain impact on the flow rate and wind pressure of the airflow, making the fan's air outlet effect poor, reducing the practicality and reliability of the fan blades. In response to the above problems, the utility model proposes a fan blade 100.

[0032] See also Figures 1 to 8 In one embodiment of the utility model, the fan blade 100 includes a hub 10 and at least two blades 30. The hub 10 is used to connect the driving mechanism, and the hub 10 is defined to have an air inlet end and an air outlet end opposite to each other; at least two blades 30 are connected to the outer periphery of the hub 10 at intervals, and the projections of the blade root and the blade tip of the blade 30 on the center plane 10a of the hub 10 along the first direction are defined to be a first projection plane 30a and a second projection plane 30b respectively, and the first projection plane 30a and the second projection plane 30b are staggered and tilted, and the inclination angle of the first projection plane 30a is greater than the inclination angle of the second projection plane 30b. The first projection plane 30a is provided with a first windward arc edge 31a protruding toward the air inlet end, and the second projection plane 30b is provided with a second windward arc edge 31b protruding toward the air inlet end.

[0033] It can be understood that the air outlet device can connect and install the fan blades 100 on a driving mechanism such as a fan or a pump, and use the driving mechanism to drive the fan blades 100 to rotate, so that the fan blades 100 disturb the air to form an outlet airflow, thereby achieving a stable blowing effect of the air outlet device.

[0034] In the present application, the fan blade 100 can be provided with a plug hole or other structures on the hub 10 to cooperate with the connection drive mechanism. The hub 10 can be a cylinder or a cylindrical structure with a certain volume, so that under the driving action of the driving mechanism on the hub 10, at least two blades 30 on the periphery of the hub 10 can be stably driven to rotate synchronously around the central axis of the hub 10, so that the blades 30 can stably disturb the air during the rotation process to form an outlet airflow. Among them, at least two blades 30 can be radially extended on the periphery of the hub 10, and the direction in which any blade 30 extends outward from the periphery of the hub 10 can be defined as a first direction. At this time, the normal plane perpendicular to the first direction where the central axis of the hub 10 is located can be the central plane 10a of the hub 10. Each blade 30 of the fan blade 100 may have a blade root connected to the periphery of the hub 10, and a blade tip opposite to the blade root and facing away from the periphery of the hub 10. The projection of the blade root of the blade 30 on the center plane 10a of the hub 10 along the first direction where the blade 30 is located is defined as the first projection plane 30a, and the projection of the blade tip of the blade 30 on the center plane 10a of the hub 10 along the first direction where the blade 30 is located is defined as the second projection plane 30b. By inclining the first projection plane 30a and the second projection plane 30b to the plane where the air outlet end of the hub 10 is located, and making the inclination angle of the first projection plane 30a greater than the inclination angle of the second projection plane 30b, the first projection plane 30a and the second projection plane 30b can be staggered on the center plane 10a of the hub 10. In this way, it is beneficial to make the overall shape of the blade 30 present a structure similar to a spiral bent plate, so that the side of the blade 30 facing the air inlet end of the hub 10 can have a certain curvature, so that the fan blade 100 can use the surface of the blade 30 to play a certain arc surface guiding role on the formed incoming airflow, reduce the flow obstruction of the incoming airflow by the surface of the blade 30, reduce the wind loss of the incoming airflow, and better improve the turbulent air outlet effect of the fan blade 100.

[0035] By making the blade 30 adopt a structure similar to a spiral bent plate, it is also beneficial for the blade 30 to have a certain function of driving the airflow to converge from the tip of the blade 30 toward the root of the blade 30, so that the fan blade 100 can better turbulent the diffused incoming air to form an outlet airflow blown out parallel to the rotation center axis of the hub 10, thereby achieving the convergent blowing effect of the fan blade 100, which is beneficial to better improve the wind force of the outlet airflow and achieve a certain high-speed blowing effect.

[0036] In addition, by forming the first projection surface 30a with a first windward arc edge 31a protruding toward the air inlet end of the hub 10, and forming the second projection surface 30b with a second windward arc edge 31b protruding toward the air inlet end of the hub 10, the surface of the blade 30 facing the air inlet end of the hub 10 can be provided with an arc-shaped protruding structure, which is conducive to making the airflow flow more smoothly along the surface of the blade 30 toward the air outlet end of the hub 10, further reducing the flow blocking impact of the fan blade 100 on the air outlet airflow, and is conducive to better reducing the flow velocity loss of the air outlet airflow. At the same time, under the action of the first windward arc edge 31a and the second windward arc edge 31b, the airflow path flowing through the windward surface 31 of the blade 30 can also be made greater than the airflow path length flowing through the leeward surface 33 of the blade 30, thereby making most of the airflow disturbed by the fan blade 100 receive a certain lift effect, which is conducive to better increasing the wind pressure of the air outlet airflow, so that the air outlet airflow can maintain a large wind pressure effect and blow out from the air outlet end of the hub 10, effectively improving the effect of the fan blade 100 disturbing the air outlet.

[0037] The technical solution of the utility model is to make the first projection surface 30a formed by the root of the blade 30 and the second projection surface 30b formed by the tip of the blade 30 inclined to the plane where the air outlet end of the hub 10 is located, and make the inclination angle of the first projection surface 30a greater than the inclination angle of the second projection surface 30b, so that the root and the tip of the blade 30 can be staggered in the first direction, so that the overall structure of the blade 30 can be similar to the spiral bent plate structure, so that the side of the blade 30 facing the air inlet end of the hub 10 has a certain arc-shaped wind-guiding effect, compared with the straight blade 30 structure, the flow-blocking effect of the blade 30 on the incoming air flow can be better reduced, and the wind loss of the incoming air flow can be better reduced. At the same time, by using the protrusion on one side of the first projection surface 30a toward the air inlet end to form the first windward arc edge 31a, and by using the protrusion on one side of the second projection surface 30b toward the air inlet end to form the second windward arc edge 31b, the spirally curved blade 30 can further form an arc-shaped protrusion structure on the surface facing the air inlet end, so that the incoming air flow can flow more smoothly along the surface of the blade 30 when contacting the blade 30, which is conducive to better reducing the impact of the incoming air flow and the fan blade 100, better reducing the loss of the incoming air flow, and achieving a better high-speed blowing effect of the fan, thereby further improving the practicality and reliability of the fan blade 100.

[0038] Among them, the fan blade 100 can be formed in one piece by milling and other processing techniques, so that the fan blade 100 can have better structural strength and rigidity, so that the fan blade 100 can better withstand wind loads, which is conducive to better improving the service life of the fan blade 100, and further improving the structural stability and reliability of the fan blade 100. At this time, the fan blade 100 needs to form a blade 30 with a certain spiral curved plate structure. During the milling process, a fixture that can achieve at least two degrees of freedom can be used to clamp the workpiece to be processed. Then, when the processing head moves around the periphery of the workpiece to form the blade 30, the driving fixture cooperates with the tool head to drive the workpiece to rotate, so that the processing head can stably cut out the blade 30 structure of the specific shape on the cylindrical workpiece, and then the fan blade 100 can be produced and processed using a convenient processing technology, effectively reducing the production and processing difficulty of the fan blade 100, and further improving the practicality and reliability of the fan blade 100.

[0039] See also Figure 5 and Figure 6 In one embodiment of the present invention, the angle between the center line of the first projection surface 30a and the plane where the air outlet is located is defined as α, 38.5°≤α≤41.5°; the angle between the center line of the second projection surface 30b and the plane where the air outlet is located is defined as β, 25.5°≤β≤28.5°.

[0040] In this embodiment, the angle α formed by the center line of the first projection surface 30a and the plane where the air outlet end is located can be the inclination angle of the first projection surface 30a, and the angle α can be set within the range of 38.5° to 41.5°, for example, α=38.5°, 39°, 39.5°, 40°, 40.5°, 41° or 41.5°, etc. Within this range, the area of ​​the inclined setting of the blade 30 can be larger, which is conducive to better increasing the contact area between the blade 30 and the incoming air flow, so that when the fan blade 100 rotates, the blade 30 can be used to better disturb the air to form a high-speed airflow, thereby achieving a better air outlet effect of the fan blade 100. At the same time, the angle β formed between the center line of the second projection surface 30b and the plane where the air outlet end is located can be the inclination angle of the first projection surface 30a, and the angle β can be set within the range of 25.5° to 28.5°, for example, α=25.5°, 26°, 26.5°, 27°, 27.5°, 28° or 28.5°, etc. Within this range, the inclination angle of the second projection surface 30b can be better set smaller than the inclination angle of the first projection surface 30a, and at the same time, the inclination angle of the second projection surface 30b can be not too different from the inclination angle of the first projection surface 30a, thereby avoiding a large degree of spiral bending of the blade 30 and a certain probability of forming a structure close to the plane parallel to the air outlet end on the blade 30, preventing part of the structure of the blade 30 from being perpendicular to the air inlet direction of the air flow, so that the overall structure of the blade 30 can have a better arc wind guiding effect, further improving the structural stability and reliability of the fan blade 100.

[0041] In addition, by setting the inclination angle of the first projection plane 30a and the inclination angle of the second projection plane 30b within the above-mentioned angle range, it is also beneficial to reduce the rotation angle of the workpiece during the milling process of the fan blade 100, which is beneficial to better reduce the difficulty of feeding the machining tool during machining, so that the fan blade 100 can be produced and processed using a more convenient processing technology, further improving the processing convenience and reliability of the fan blade 100.

[0042] Furthermore, in one embodiment of the present invention, the number of blades 30 is 11.

[0043] In this embodiment, when the first projection surface 30a and the second projection surface 30b of the blade 30 are set at the above-mentioned angles, the fan blade 100 can be set with a structure of 11 blades 30. In this way, the 11 blades 30 can be used to better surround the outer periphery of the hub 10, so that the fan blade can use the 11 blades 30 structure similar to a spiral to achieve a more comprehensive turbulence effect of the fan blade 100 in the air outlet device, further improving the structural stability and reliability of the fan blade 100. Among them, the use of 11 blades 30 can better ensure the stable processing and production of the fan blade 100 when the blade 30 is set at the above-mentioned angle, and at the same time, the outlet airflow can have a larger airflow pressure after the turbulence of the fan blade 100, ensuring the high-speed blowing effect of the air outlet device, and further improving the practicality and reliability of the fan blade 100.

[0044] See also Figure 4 In one embodiment of the utility model, the first projection surface 30a is further provided with a first leeward arc edge 33a protruding toward the wind outlet end, and the distance between the first leeward arc edge 33a and the center line of the first projection surface 30a is smaller than the distance between the first windward arc edge 31a and the center line of the first projection surface 30a. The second projection surface 30b is further provided with a second leeward arc edge 33b protruding toward the wind outlet end, and the distance between the second leeward arc edge 33b and the center line of the second projection surface 30b is smaller than the distance between the second windward arc edge 31b and the center line of the second projection surface 30b.

[0045] In this embodiment, a first leeward arc edge 33a is formed by protruding the side edge of the first projection surface 30a toward the wind outlet, and the first leeward arc edge 33a can be arranged opposite to the first windward arc edge 31a, and a second leeward arc edge 33b is formed by protruding the side edge of the second projection surface toward the wind outlet, and the second leeward arc edge 33b can be arranged opposite to the second windward arc edge 31b, so that a certain arc-shaped protruding structure can be formed on the side of the blade 30 toward the wind outlet of the hub 10. At this time, when the fan blade 100 rotates to disturb the airflow, the arc-shaped protruding structures on both sides of the blade 30 can be used to better guide the airflow, so that the fan blade 100 can achieve a better wind outlet effect, further improving the practicality and reliability of the fan blade 100. In addition, by forming arc-shaped protruding structures on both sides of the blade 30, the machining tool can move the blade more smoothly when milling the fan blade 100, which is conducive to better reducing the difficulty of integrated machining of the fan blade 100 and further improving the machining convenience of the fan blade 100.

[0046] Among them, by making the distance between the first leeward arc edge 33a and the center line of the first projection surface 30a smaller than the distance between the first windward arc edge 31a and the center line of the first projection surface 30a, and making the distance between the second leeward arc edge 33b and the center line of the second projection surface 30b smaller than the distance between the second windward arc edge 31b and the center line of the second projection surface 30b, the protrusion height of the blade 30 toward the air outlet side can be made smaller than the protrusion height of the blade 30 toward the air inlet side, so that the path of the airflow flowing on the side of the blade 30 toward the air inlet side can be made greater than the path of the airflow flowing on the side of the blade 30 toward the air outlet side, and the difference in the flow paths of the airflow on both sides can be used to make the airflow flowing on the side of the blade 30 toward the air inlet end be subject to a certain lift, which is beneficial to better improve the airflow pressure of the turbulent air outflow through the fan blade 100 under the action of lift, achieve a better high-speed blowing effect of the fan, and further improve the structural reliability and practicality of the fan blade 100.

[0047] See also Figure 1 and Figure 2 In one embodiment of the utility model, the blade 30 has a windward surface 31 and a leeward surface 33 opposite to each other, the windward surface 31 is arranged toward the wind inlet end, and the leeward surface 33 is arranged toward the wind outlet end. The blade 30 also has a first side surface 35 and a second side surface 37 connecting the windward surface 31 and the leeward surface 33, the first side surface 35 is arranged close to the wind inlet end, the second side surface 37 is arranged close to the wind outlet end, and the connection between the second side surface 37 and the leeward surface 33 is arranged at an angle.

[0048] In this embodiment, by connecting the windward surface 31 and the leeward surface 33 of the blade 30 with the first side surface 35 at a position close to the air inlet end, and connecting the windward surface 31 and the leeward surface 33 with the second side surface 37 at a position close to the air outlet end, the blade 30 can be set as a plate structure with a certain thickness, thereby better improving the structural strength of the fan blade 100. Among them, by setting the connection between the second side surface 37 and the leeward surface 33 at an angle, the blade 30 can adopt a sharper structural design at the position closest to the air outlet end of the hub 10, so that the airflow flowing around the periphery of the blade 30 can achieve a smoother air outlet effect at the sharp position when it flows through the connection between the second side surface 37 and the leeward surface 33 and leaves the blade 30 to outlet. Compared with setting an arc-shaped transition structure at the connection between the second side surface 37 and the leeward side 33, the use of an angled connection structure can better reduce the retention and swirl of the outlet air flow on the blade 30, so that the fan blade 100 can achieve a more sufficient turbulent air outlet effect, achieve a blowing effect with a larger air volume, and further improve the structural stability and reliability of the fan blade 100.

[0049] See also Figure 1 and Figure 2In one embodiment of the present utility model, the first side surface 35 is arranged in an arc-shaped protrusion, and the connection between the second side surface 37 and the windward surface 31 is arranged in an arc shape.

[0050] In this embodiment, by setting the first side surface 35 as an arc-shaped convex structure, the incoming airflow can be better diverted and disturbed at the first side surface 35 to flow to the windward surface 31 and the leeward surface 33, thereby achieving a better airflow guiding effect of the fan blade 100, further reducing the wind blocking of the incoming airflow by the fan blade 100, and reducing the wind loss of the incoming airflow. By setting the connection between the second side surface 37 and the windward surface 31 as an arc-shaped structure, the airflow can flow better along the connection between the second side surface 37 and the windward surface 31 to the connection between the second side surface 37 and the leeward surface 33 to converge the wind when flowing on the windward surface 31, and the guiding and converging effect of the blade 30 on the outgoing airflow can be further improved at the angle connection between the second side surface 37 and the leeward surface 33, ensuring the large air volume and high-speed blowing of the fan, and further improving the structural stability and reliability of the fan blade 100.

[0051] In addition, by configuring the first side surface 35 to be an arc-shaped protruding structure and configuring the second side surface 37 and the windward surface 31 to be connected by an arc-shaped structure, during the integral processing of the fan blade 100, the processing tool can more smoothly perform milling processing to form the leeward surface 33, the first side surface 35, the windward surface 31 and the second side surface 37 in sequence, so that the processing tool can utilize the arc-shaped structural path to achieve more convenient tool movement when processing the first side surface 35 and the second side surface 37 of the blade 30, which is conducive to better reducing the processing difficulty of the fan blade 100 and further improving the processing convenience and reliability of the fan blade 100.

[0052] See also Figure 1 In one embodiment of the present invention, the width of the blade 30 in the first direction is configured to gradually increase from the root of the blade 30 to the tip of the blade 30 .

[0053] In this embodiment, by gradually increasing the width of the blade 30 in the first direction, the blade 30 can be arranged in a certain fan-shaped structure in the top view of the fan blade 100, so that the center line length of the second projection surface 30b can be set greater than the center line length of the first projection surface 30a, and then the blade 30 can be used to form a structure similar to a spiral curved plate to better increase the turbulence area of ​​the blade 30 and better improve the turbulence effect of the fan blade 100 on the outlet airflow. In addition, by using the blade 30 structure that gradually increases outward, the blade 30 can be used to more fully contact the disturbed airflow, which is conducive to making the outlet airflow have a better airflow pressure, so that the fan can achieve a more stable and reliable high-speed blowing effect, further improving the practicality and reliability of the fan blade 100.

[0054] See also Figure 1 and Figure 2 In one embodiment of the utility model, the hub 10 includes a guide section 11 and a mounting section 13, the guide section 11 is connected to the mounting section 13, at least two blades 30 are connected to the outer periphery of the mounting section 13 at intervals, and the width of the guide section 11 along the second direction is configured to gradually increase from the air inlet end to the air outlet end.

[0055] In this embodiment, the fan blade 100 can drive the air to form an airflow that flows through the guide section 11 and the mounting section 13 of the hub 10 in sequence when the fan blade 10 rotates. At this time, the direction of the airflow flowing through the fan blade 100 can be set to the second direction, that is, the second direction is used to represent the air outlet direction of the fan. By gradually increasing the width of the guide section 11 in the second direction, the guide section 11 can be made to have a structural setting similar to a truncated cone. Then, when the airflow flows through the hub 10, the airflow can flow more smoothly to the mounting section 13 and contact the blade 30 under the action of the arc surface guide of the outer periphery of the guide section 11. Compared with the planar guide section 11 structure, the collision resistance of the hub 10 to the incoming airflow can be effectively reduced, the wind loss of the incoming airflow can be reduced, and the fan can be guaranteed to achieve a better high-speed blowing effect, thereby further improving the structural stability and reliability of the fan blade 100.

[0056] Among them, Figure 7 and Figure 8 As shown, Figure 8 The figure is a schematic diagram of the flow velocity of the outlet airflow obtained by testing the fan blade 100 of an embodiment of the utility model using simulation software. In the figure, the higher the gray value, the lower the airflow velocity. Obviously, under the action of the guide section 11, the inlet airflow can maintain a high flow velocity and flow along the arc-shaped outer peripheral surface of the guide section 11 to the installation section 13 and the blade 30 to contact the turbulence, and the outlet airflow after the turbulence of the fan blade 100 can have a higher flow velocity for discharge; Figure 7 The flow diagram of the outlet airflow passing through the fan blade 100 when the cross-section of the fan blade 100 is shown obtained by simulation test. It can be seen from the figure that under the guiding effect of the guide section 11, the incoming airflow can stably flow along the periphery of the fan blade 100, reducing the impact and collision between the fan blade 100 and the incoming airflow, and reducing the wind loss of the outlet airflow, indicating that the fan blade 100 provided by the utility model can achieve a better high-speed turbulent blowing effect.

[0057] See also Figure 1 and Figure 2 In one embodiment of the utility model, a first guide surface 111 and a second guide surface 113 are formed on the outer periphery of the guide section 11. The first guide surface 111 is arranged in an arc shape, and the second guide surface 113 is connected to the first guide surface 111 and is bent and connected to the mounting section 13.

[0058] In this embodiment, the second guide surface 113 can be a connecting surface between the first guide surface 111 and the outer peripheral surface of the guide section 11. The first guide surface 111 can be set at an angle or as a certain arc-shaped convex surface, so that the first guide surface 111 can play a role in better guiding the incoming airflow and reducing the wind force blocking loss of the hub 10 to the incoming airflow. At this time, by making the second guide surface 113 adopt an arc-shaped structure, the connection position between the guide section 11 and the mounting section 13 can have a certain arc-shaped guide effect, which is beneficial for the incoming air flow to flow to the mounting section 13 more smoothly under the guide effect of the second guide surface 113 when it flows to the mounting section 13 along the first guide surface 111. Compared with the design in which the connection position between the guide section 11 and the mounting section 13 is at an angle, it can effectively avoid the airflow from diffusing at the connection point, prevent the outlet airflow from colliding with the inner wall of the channel in the air outlet channel of the fan, effectively reduce the wind loss of the outlet airflow, better realize the turbulence effect of the fan blade 100 on the outlet airflow, and further improve the practicality and reliability of the fan blade 100.

[0059] See also Figure 3 In one embodiment of the utility model, the length of the hub 10 along the second direction is defined as H, the length of the guide section 11 along the second direction is defined as h1, and the length of the mounting section 13 along the second direction is defined as h2, 0.4≤h1 / H≤0.5, 0.5≤h2 / H≤0.6.

[0060] In this embodiment, by setting the ratio of the length h1 of the guide section 11 to the length H of the hub 10 to 0.4 to 0.5, and setting the ratio of the length h2 of the mounting section 13 to the length H of the hub 10 to 0.5 to 0.6, within this ratio range, when the hub 10 needs to meet a certain length requirement, the ratio of the mounting section 13 to the guide section 11 can be more appropriate, which is beneficial to avoid the guide section 11 being too long and having a certain probability of causing the mounting section 13 to be required to be configured with a large number of blades 30 to ensure the turbulence effect. At the same time, it can avoid the installation section 13 being too long and having a certain probability of causing the hub 10 to have a poor guiding effect on the incoming airflow, so that the fan blade 100 can achieve a more reasonable structural setting within this ratio range, which is beneficial to better realize the overall structural simplification of the fan blade 100, reduce the difficulty of processing and production of the fan blade 100, and further improve the practicality and reliability of the fan blade 100.

[0061] The utility model also proposes an air outlet device, which includes a driving mechanism and a fan blade 100. The specific structure of the fan blade 100 refers to the above embodiment. Since the air outlet device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0062] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A fan blade, characterized in that: include: A hub, the hub is used to connect the driving mechanism, and the hub is defined to have an air inlet end and an air outlet end opposite to each other; and At least two blades, at least two of the blades are connected to the outer periphery of the hub at intervals, and the projections of the blade root and the blade tip along the first direction on the center plane of the hub are defined as a first projection plane and a second projection plane respectively, the first projection plane and the second projection plane are staggered and inclined, and the inclination angle of the first projection plane is greater than the inclination angle of the second projection plane; The first projection surface is provided with a first windward arc edge protruding toward the air inlet end, and the second projection surface is provided with a second windward arc edge protruding toward the air inlet end.

2. The fan blade according to claim 1, characterized in that: The angle between the center line of the first projection surface and the plane where the air outlet is located is defined as α, 38.5°≤α≤41.5°; The angle between the center line of the second projection surface and the plane where the air outlet is located is defined as β, 25.5°≤β≤28.5°.

3. The fan blade according to claim 2, characterized in that: The number of the blades is eleven.

4. The fan blade according to claim 1, characterized in that: The first projection surface is further provided with a first leeward arc edge protruding toward the wind outlet end, and the distance between the first leeward arc edge and the center line of the first projection surface is smaller than the distance between the first windward arc edge and the center line of the first projection surface; The second projection surface is further provided with a second leeward arc edge protruding toward the air outlet end, and the distance between the second leeward arc edge and the center line of the second projection surface is smaller than the distance between the second windward arc edge and the center line of the second projection surface.

5. The fan blade according to claim 1, characterized in that: The blade has a windward surface and a leeward surface opposite to each other, the windward surface is arranged toward the wind inlet end, and the leeward surface is arranged toward the wind outlet end; The blade also has a first side surface and a second side surface connecting the windward surface and the leeward surface, the first side surface is arranged close to the wind inlet end, the second side surface is arranged close to the wind outlet end, and the connection between the second side surface and the leeward surface is arranged at an angle.

6. The fan blade according to claim 5, characterized in that: The first side surface is arranged in an arc-shaped protrusion, and the connection between the second side surface and the windward surface is arranged in an arc shape.

7. The fan blade according to any one of claims 1 to 5, characterized in that The hub includes a guide section and a mounting section, the guide section is connected to the mounting section, at least two blades are spaced and connected to the outer circumference of the mounting section, and the width of the guide section along the second direction is configured to gradually increase from the air inlet end to the air outlet end.

8. The fan blade according to claim 7, characterized in that: The outer circumference of the guide section is formed with a first guide surface and a second guide surface, the first guide surface is arranged in an arc shape, and the second guide surface is connected to the first guide surface and is bent to connect to the mounting section.

9. The fan blade according to claim 7, characterized in that: The length of the hub along the second direction is defined as H, the length of the guide section along the second direction is defined as h1, the length of the installation section along the second direction is defined as h2, 0.4≤h1 / H≤0.5, 0.5≤h2 / H≤0.

6.

10. An air outlet device, characterized in that: The air outlet device includes a driving mechanism and a fan blade, wherein the fan blade is the fan blade according to any one of claims 1 to 9, and the fan blade is connected to the driving mechanism.

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