A fan blade and an article having a fan blade.

Abstract

This application relates to a fan blade and an article having fan blades, belonging to the field of fan technology. The fan blade includes a base, which is rotatably mounted on a fan. At least two blades are evenly distributed on the base. The blades extend away from the base, with the portion of the blade closest to the base being the root and the portion furthest from the base being the tip. The direction of extension from the center of the root to the midpoint of the tip is a first direction, and the thickness of the blade smoothly decreases along the first direction. The airfoil of the blade is curved in the middle towards a direction perpendicular to the plane of rotation of the base. The root of the blade retains sufficient thickness to ensure necessary rigidity and structural strength. The thinner blade tip effectively increases the airflow speed during fan operation. Simultaneously, the airfoil's middle curvature towards a direction perpendicular to the plane of rotation of the base, and the root airfoil's similarity to a gull-wing airfoil, effectively improves the aerodynamic efficiency of the fan blade and reduces noise during operation.

Description

Technical Field

[0001] This application relates to the field of fan technology, and more specifically, to a fan blade and an article having a fan blade. Background Technology

[0002] Fans are essential household appliances for cooling off in the summer. As living standards improve, consumers are increasingly demanding higher performance from fans, with airflow and blowing distance being key performance indicators. With fan power remaining constant, airflow and blowing distance are largely determined by the fan blades.

[0003] In related technologies, fan blades are typically designed to provide better airflow performance. However, while thicker blades offer better structural strength, they also increase weight and drag, potentially leading to decreased airflow efficiency. Conversely, thinner blades, although lightweight and with low drag, may lack the necessary rigidity and are prone to deformation or damage at high speeds. Utility Model Content

[0004] In order to at least address some of the deficiencies mentioned in the related art, this application provides a fan blade and an article having a fan blade.

[0005] To achieve the above objectives, this application provides a fan blade, including a base rotatably mounted on a fan, wherein at least two blades are evenly distributed on the base. The blades extend away from the base, with a root portion closer to the base and an end portion further away from the base. The direction of extension from the center of the root portion to the midpoint of the end portion is a first direction, and the thickness of the blade smoothly decreases along the first direction. The airfoil of the blade is curved in the middle towards a direction perpendicular to the plane of rotation of the base.

[0006] Furthermore, the blade is defined with a plurality of airfoils along the first direction. The twist angle of the plurality of airfoils gradually decreases along the direction from the root to the tip of the blade. The chord length of the plurality of airfoils gradually increases along the first direction.

[0007] Furthermore, when the blade is in a plane, the distance between the plurality of airfoils is the same.

[0008] Furthermore, the airfoil curve has an abscissa of x and an ordinate of f(x) in a rectangular coordinate system, satisfying:

[0009] f(x)=a0+a1·cos(x·w)+b1·sin(x·w)+a2·cos(2·x·w)+b2·sin(2

[0010] ·x·w)+a3·cos(3·x·w)+b3·sin(3·x·w)+a4·cos(4·x·w)+b4·sin(4·x·w).

[0011] Where a0 is a constant term, a1, a2, a3, and a4 are the coefficients of the cosine term, b1, b2, b3, and b4 are the coefficients of the sine term, and w is the angular frequency.

[0012] Furthermore, the airfoil at the end of the blade is configured as a capping model, the capping model is an arc surface, and the projection of the capping model coincides with the airfoil at the end.

[0013] Furthermore, the line connecting the midpoints of the multiple airfoils is a midpoint line. When the base rotates to make the first direction vertical, the horizontal direction is set as the second direction, and the midpoint of each airfoil moves a suitable distance along the second direction so that the midpoint line forms an arc in the rotation plane of the base.

[0014] Furthermore, both the first direction and the second direction are located within the rotation plane of the seat body, and the direction perpendicular to the rotation plane is set as the third direction. The midpoint of each airfoil is moved a suitable distance along the third direction so that the midpoint line forms a spatial arc.

[0015] This application also provides an article with fan blades, including an article body and fan blades as described in any of the above embodiments, wherein the fan blades are rotatably mounted on the article body at the position where air needs to be blown.

[0016] Furthermore, the items with fan blades include floor fans, table fans, and ceiling fans.

[0017] In the above technical solution, the fan blade includes a base body, which is rotatably mounted on the fan. At least two blades are evenly distributed on the base body. The blades extend away from the base body, with the portion of the blade closest to the base body being the root and the portion furthest from the base body being the tip. The direction of extension from the center of the root to the midpoint of the tip is a first direction, and the thickness of the blade smoothly decreases along this first direction. The airfoil of the blade is curved in the middle towards a direction perpendicular to the plane of rotation of the base body.

[0018] The blade thickness gradually decreases from the root to the tip, but sufficient thickness is maintained at the root to ensure necessary rigidity and structural strength, preventing deformation or damage during high-speed operation and improving the durability of the fan blades. The thinner blade tips effectively improve the blade's wind-cutting performance, increasing the airflow speed during fan operation. Simultaneously, the airfoil's midsection curves towards a direction perpendicular to the plane of rotation of the base, and the root airfoil resembles a gull-wing airfoil, effectively improving the aerodynamic efficiency of the fan blades and reducing noise. Furthermore, the blades of this application can suppress flow separation during use, enhancing airflow stability and reducing energy consumption.

[0019] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a first-view structural schematic diagram of the fan blade provided in an embodiment of this application;

[0022] Figure 2 This is a structural schematic diagram of the fan blade from a second perspective, provided in an embodiment of this application.

[0023] Figure 3 A third-view structural schematic diagram of the fan blade provided in an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the structure of the blades arranged along the first direction according to an embodiment of this application;

[0025] Figure 5 A schematic diagram of the structure of the blade provided in an embodiment of this application, showing the blade along a first direction and a second direction from one perspective.

[0026] Figure 6 A schematic diagram of the blade provided in this application embodiment, showing another perspective of its arrangement along a first direction and a second direction;

[0027] Figure 7 A schematic diagram of the structure of the blade provided in the embodiments of this application, showing a view along a first direction, a second direction, and a third direction;

[0028] Figure 8This is a structural schematic diagram of the blade provided in the embodiments of this application, showing another perspective of the blade being positioned along a first direction, a second direction, and a third direction.

[0029] Figure 9 The diagram shows the structure of each airfoil of the blade provided in the embodiments of this application.

[0030] icon:

[0031] 100 - base; 110 - blade; 111 - root; 112 - end; 120 - midpoint line; I - first direction; II - second direction; III - third direction. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] This embodiment provides a fan blade to solve the problem in the related art that a thicker blade 110 will affect the blowing efficiency, while a thinner blade 110 will affect the structural strength.

[0036] For example, such as Figures 1 to 3As shown, a fan blade includes a base 100, which is rotatably mounted on a fan. At least two blades 110 are evenly distributed on the base 100. The blades 110 extend away from the base 100, with a root 111 near the base 100 and an end 112 away from the base 100. The direction of extension from the center of the root 111 to the midpoint of the end 112 is a first direction I, and the thickness of the blade 110 smoothly decreases along the first direction I. The airfoil of the blade 110 is curved in the middle towards a direction perpendicular to the plane of rotation of the base 100.

[0037] Specifically, in this embodiment, the thickness of the fan blade 110 decreases smoothly from the root 111 to the end 112 along the first direction I. In this way, at the connection between the blade 110 and the base 100, the blade 110 has sufficient thickness to ensure that the fan blade has the necessary rigidity and structural strength during operation, and to prevent the blade 110 from deforming or being damaged during high-speed operation, which would affect the normal airflow of the fan blade.

[0038] At the end 112 of the blade 110, which is away from the base 100, the blade 110 is thinner. This results in less air resistance during rotation and less interference with airflow, allowing airflow to pass more smoothly over the blade surface, reducing energy loss and improving fan efficiency. The thinner blade 110 also facilitates more precise control of airflow direction and speed. In particular, the airfoil of the blade 110 in this embodiment is curved in the middle towards a direction perpendicular to the plane of rotation of the base 100, resembling a gull-wing airfoil. This optimized blade shape guides airflow, generating greater lift or thrust. For the fan, this means a stronger, more direct airflow can be generated, increasing the blowing distance and coverage area.

[0039] In one embodiment, exemplarily, such as Figure 7 , Figure 8 As shown, the blade 110 has multiple airfoils defined along a first direction I. The twist angle of the multiple airfoils gradually decreases along the direction from the root 111 to the tip 112 of the blade 110. The chord length of the multiple airfoils gradually increases along the first direction I.

[0040] The twist angle refers to the angle between the chord line of the airfoil 110 and the plane of rotation. The design of a gradually decreasing twist angle along the direction from the root 111 to the tip 112 of the blade 110 allows the blade 110 to better adapt to airflow characteristics at different positions. Specifically, the root 111, closer to the center of rotation and with a lower linear velocity, allows for a larger twist angle to capture more air and enhance airflow generation. The tip 112, with a higher linear velocity, allows for a smaller twist angle to increase airflow velocity, thereby improving overall efficiency.

[0041] Chord length refers to the distance from the leading edge to the trailing edge of the airfoil. The design of gradually increasing chord length allows the blade 110 to push more air away from the center of rotation. Due to the high linear velocity at the tip 112, the longer chord length can more effectively utilize high-speed airflow, increase air volume, and extend the blowing distance.

[0042] The change in twist angle allows the blades 110 to guide airflow more smoothly at different positions, reducing airflow separation and turbulence. This not only improves fan efficiency but also reduces fan operating noise. Furthermore, the gradually increasing chord length, combined with the corresponding change in twist angle, enables the blade tip 112 to cut air more stably, further reducing eddies and irregular airflow, ensuring a smoother and more concentrated airflow.

[0043] In one embodiment, exemplarily, such as Figure 4 As shown, when blade 110 is in the plane, the distance between multiple airfoils is the same. The evenly distributed airfoils help ensure uniform airflow. In other words, the airflow generated by the fan is more stable and consistent, reducing problems caused by uneven airflow leading to localized excessively strong or weak winds. This improves user comfort and more effectively covers the entire blowing area.

[0044] In one embodiment, for example, the airfoil curve has an abscissa of x and a ordinate of f(x) in a rectangular coordinate system, satisfying:

[0045] f(x)=a0+a1·cos(x·w)+b1·sin(x·w)+a2·cos(2·x·w)+b2·sin(2·x·w)+a3·cos(3·x·w)+b3·sin(3·x·w)+a4·cos(4·x·w)+b4·sin(4·x·w).

[0046] The airfoil has a twist angle of x and a chord length of f(x), satisfying:

[0047] Where a0 is a constant term, a1, a2, a3, and a4 are the coefficients of the cosine term, b1, b2, b3, and b4 are the coefficients of the sine term, and w is the angular frequency.

[0048] Specifically, a0 determines the baseline value of the chord length, reflecting the overall dimensions of blade 110. Based on this, by adjusting the coefficients of the sine and cosine terms, the variation trend of the chord length with the twist angle can be fine-tuned. This formula allows the operator to achieve precise control over the airfoil curve by adjusting multiple parameters to obtain different airfoil curves. A suitable airfoil curve can then be selected and smoothly applied to the blade section, thereby optimizing the shape of blade 110 according to actual needs and meeting different aerodynamic performance requirements, such as increasing airflow, increasing blowing distance, or reducing noise.

[0049] During the rotation of the fan blade 110, the airflow velocity and direction change at different positions. By introducing multiple cosine and sine terms, this complex airflow characteristic can be simulated more accurately. The specific values ​​of the constant terms, as well as the specific values ​​of the sine, cosine, and angular frequencies, can be obtained through a finite number of experiments. The experimental method involves adjusting each parameter, and then testing the fan blade's blowing efficiency and structural strength using any existing testing method or equipment.

[0050] It should be noted that the airfoil of blade 110 includes two curves, namely the upper chord and the lower chord of blade 110. In this embodiment, both the upper chord curve and the lower chord curve of blade 110 satisfy the general formula of the function.

[0051] Regarding the specific values ​​of each parameter, in this embodiment, as follows: Figure 9 As shown, when 13 airfoils are uniformly defined along the first direction I, the specific parameters of each airfoil are as follows after a finite number of experiments:

[0052]

[0053]

[0054]

[0055] Based on the data in the table above, the chord length of each airfoil in this embodiment can be obtained by substituting it into the formula. Thus, based on the twist angle and chord length, the specific shape of each airfoil can be determined, thereby obtaining the specific shape of the blade 110.

[0056] In one embodiment, for example, the airfoil of the tip 112 of the blade 110 is set as a capped model, the capped model is an arc surface, and the projection of the capped model coincides with the airfoil of the tip 112. Specifically, through fitting and experimental measurement, it can be easily determined that if the tip 112 of the blade 110 is set as a plane, it is not conducive to improving the aerodynamic performance of the blade 110. Based on this, setting the tip 112 of the blade 110 as a curved surface and making its projection coincide with the thirteenth airfoil can effectively increase the airflow speed and improve the overall performance of the blade 110 in this embodiment.

[0057] In one embodiment, exemplarily, such as Figure 5 , Figure 6As shown, the line connecting the midpoints of multiple airfoils is the midpoint line 120. When the base 100 rotates to make the first direction I vertical, the horizontal direction is set as the second direction II. The midpoint of each airfoil moves a suitable distance along the second direction II so that the midpoint line 120 forms an arc in the plane of rotation of the base 100. By making the midpoint line 120 an arc, that is, by bending the blade 110 as a whole, the airflow can be guided more effectively and distributed more evenly over a larger area. This helps to improve the overall ventilation efficiency of the fan and ensures that when using the fan blades of this embodiment, the space being blew through can receive a relatively uniform and good ventilation effect.

[0058] Furthermore, when the fan operates at high speed, the blades 110 experience significant centrifugal force. The curved design of the blades 110 can disperse the direction of these forces to a certain extent, preventing stress concentration in a specific area, thereby increasing the durability of the blades 110 and the stability of the overall structure. In this embodiment, the design of the blades 110 being thicker at the root 111 and thinner at the tip 112 further ensures that the fan blades of this embodiment possess both high strength and good airflow efficiency.

[0059] In one embodiment, exemplarily, such as Figure 7 , Figure 8 As shown, both the first direction I and the second direction II are located within the rotation plane of the base 100, and the direction perpendicular to the rotation plane is designated as the third direction III. The midpoint of each airfoil is moved a suitable distance along the third direction III so that the midpoint line 120 forms a spatial arc. By introducing an offset in the third direction III, making the midpoint line 120 a spatial arc, airflow can be controlled more precisely in three-dimensional space. The spatial arc design allows for greater airflow coverage and ensures a more uniform airflow distribution, thus guaranteeing the air delivery effect of the fan blades in this embodiment.

[0060] Understandably, a well-designed three-dimensional shape can help guide airflow more smoothly through the blades 110, thereby reducing turbulence and energy loss.

[0061] This embodiment also provides an article with fan blades, including an article body and fan blades as described in any of the above embodiments, wherein the fan blades are rotatably mounted on the article body at the position where air needs to be blown.

[0062] For example, the item with fan blades includes a floor fan, a table fan, and a ceiling fan. Of course, it can also be other devices that require a blowing function.

[0063] The article with fan blades in this embodiment includes the fan blades in any of the above embodiments, and thus possesses all the beneficial effects of fan blades, which will not be repeated here.

[0064] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0065] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A fan blade, characterized in that, include: A base (100) is rotatably mounted on a fan, and at least two blades (110) are evenly distributed on the base (100); The blade (110) extends away from the base (100), and the position of the blade (110) near the base (100) is the root (111), and the position of the blade (110) away from the base (100) is the end (112); the direction of extension from the center of the root (111) to the midpoint of the end (112) is the first direction (I), and the thickness of the blade (110) decreases smoothly along the first direction (I); The airfoil of the blade (110) is bent in the middle toward a direction perpendicular to the plane of rotation of the base (100).

2. The leaf according to claim 1, characterized in that The blade (110) is defined with multiple airfoils along the first direction (I); The twist angle of the plurality of airfoils gradually decreases along the direction from the root (111) to the tip (112) of the blade (110); Along the first direction (I), the chord length of the plurality of airfoils gradually increases.

3. The leaf according to claim 2, wherein When the blade (110) is in a plane, the distance between the plurality of airfoils is the same.

4. The leaf according to claim 2, wherein The curve of the airfoil has an abscissa of x and an ordinate of f(x) in a rectangular coordinate system, satisfying: f(x)=a0+a1·cos(x·w)+b1·sin(x·w)+a2·cos(2·x·w)+b2·sin(2·x·w)+a3·cos(3·x·w)+b3·sin(3·x·w)+a4·cos(4·x·w)+b4·sin(4·x·w); Where a0 is a constant term, a1, a2, a3, and a4 are the coefficients of the cosine term, b1, b2, b3, and b4 are the coefficients of the sine term, and w is the angular frequency.

5. The leaf according to claim 4, wherein The airfoil of the end (112) of the blade (110) is set as a capping model, the capping model is an arc surface, and the projection of the capping model coincides with the airfoil of the end (112).

6. The leaf according to claim 2, wherein The line connecting the midpoints of the multiple airfoils is the midpoint line (120); When the seat (100) is rotated so that the first direction (I) is vertical, the horizontal direction is set as the second direction (II). The midpoint of each airfoil moves a suitable distance along the second direction (II) so that the midpoint line (120) forms an arc in the rotation plane of the seat (100).

7. The leaf according to claim 6, wherein The first direction (I) and the second direction (II) are both located in the rotation plane of the seat (100), and the direction perpendicular to the rotation plane is set as the third direction (III); The midpoint of each airfoil is moved a suitable distance along the third direction (III) so that the midpoint line (120) forms a spatial arc.

8. An article having a fan, characterized by, It includes a main body of an article and a fan blade as described in any one of claims 1 to 7, wherein the fan blade is rotatably mounted on the main body of the article at the position where air needs to be blown.

9. The article having a fan according to claim 8, wherein, The items with fan blades include floor fans, table fans, and ceiling fans.

Images