Fan blade structure and fan

Abstract

The utility model provides a fan blade structure and a fan, and the fan blade structure comprises a transmission assembly and blades. The transmission assembly comprises a transmission shaft. The multiple blades are arranged, and the multiple blades are evenly distributed on the transmission assembly in the circumferential direction. An inner guide line is arranged at the joint of the blade and the transmission shaft, a connecting line between two end points of the inner guide line is arranged to be a first straight line, a line-plane angle between the first straight line and the horizontal plane is arranged to be a guide angle alpha, and the value range of the guide angle alpha is larger than or equal to 35 degrees and smaller than or equal to 45 degrees. In the fan blade structure, attachment and separation between airflow and the blades can be affected through the design of the inner guide lines, and therefore the aerodynamic performance of the blades is changed. According to the fan blade structure, the inner guide line of the blade is limited, so that the line-plane angle between the inner guide line and the horizontal plane, namely the guide angle alpha, is set within the value range. It is guaranteed that in a 14-inch fan blade structure, the fan blade structure can achieve better silencing and wind gathering effects.

Description

Technical Field

[0001] The utility model relates to the field of fans, and in particular to a fan blade structure and a fan. Background Art

[0002] Fans are two-season appliances and are a must-have for consumers in summer. With the improvement of quality of life, consumers' requirements for fan quality are also gradually increasing, such as quiet effect and wind gathering performance.

[0003] In the related art, the wind gathering effect is usually achieved by enlarging the fan blades or increasing the motor power, but it is impossible to achieve the purpose of silence and wind gathering at the same time. Utility Model Content

[0004] In order to overcome the defects existing in the related art, the utility model provides a fan blade structure and a fan.

[0005] The embodiment of the utility model is achieved as follows:

[0006] A fan blade structure comprises a transmission assembly and a blade. The transmission assembly comprises a transmission shaft. A plurality of blades are provided, and the plurality of blades are evenly distributed circumferentially on the transmission assembly. The connection between the blade and the transmission shaft is set as an inner guide line, the line between the two end points of the inner guide line is set as a first straight line, the line-surface angle between the first straight line and a horizontal plane is set as a guide angle α, and the value range of the guide angle α satisfies: 35°≤α≤45°.

[0007] In some embodiments, exemplarily, a vertex is provided at a position of the blade away from the transmission shaft, and the blade includes a first outer guide line and a second outer guide line. The first outer guide line is an arc line between an end point of the inner guide line and the vertex, and the second outer guide line is an arc line between an end point on the inner guide line away from the first outer guide line and the vertex.

[0008] In some embodiments, exemplarily, the first outer guide wire is set to be an arc line, and the curve diameter of the first outer guide wire is set to L1, satisfying: 155mm≤L1≤160mm.

[0009] In some embodiments, exemplarily, the second outer guide wire is set to be an arc line, and the curve diameter of the second outer guide wire is set to L2, satisfying: 165mm≤L2≤170mm.

[0010] In some embodiments, exemplarily, the thickness of the blade gradually decreases along the direction of the fan blade from close to the transmission shaft to away from the transmission shaft.

[0011] In some embodiments, the blade material is exemplarily set to acrylonitrile butadiene styrene copolymer (ABS) plastic. The thickness of the blade near the transmission shaft is set to B, which satisfies: 1.8 mm ≤ B ≤ 1.9 mm.

[0012] In some embodiments, exemplarily, the thickness of the blade at a position away from the transmission shaft is set to C, satisfying: C=1.5 mm.

[0013] In some embodiments, the blade material is exemplarily set to polypropylene (PP) hardened plastic. The thickness of the blade near the transmission shaft is set to B, which satisfies: 1.9 mm ≤ B ≤ 2.0 mm.

[0014] In some embodiments, exemplarily, the thickness of the blade at a position away from the transmission shaft is set to C, satisfying: 1.5 mm ≤ C ≤ 1.6 mm.

[0015] A fan comprises a motor, a housing and a blade structure as described in any one of the above embodiments, wherein the blade structure is rotatably mounted in the housing, and the motor is used to drive the blade structure to rotate. The number of stacks of the motor is set to A, and the range of the number of stacks of the motor satisfies: 15≤A≤18; and the number of stacks of the motor is positively correlated with the size of the guide angle.

[0016] The beneficial effects of the embodiments of the utility model are:

[0017] The utility model provides a fan blade structure, including a transmission assembly and a blade. The transmission assembly includes a transmission shaft. A plurality of blades are provided, and the plurality of blades are evenly distributed circumferentially on the transmission assembly. The connection between the blade and the transmission shaft is set as an inner guide line, the line between the two end points of the inner guide line is set as a first straight line, the line-surface angle between the first straight line and the horizontal plane is set as a guide angle α, and the value range of the guide angle α satisfies: 35°≤α≤45°. In this way, when the utility model is in use, the fan blade structure is loaded into the fan, and the fan drives the blade to rotate through the transmission shaft, and the blade rotates to blow air outward.

[0018] In the fan blade structure, the design of the inner guide line can affect the attachment and separation between the airflow and the blade, thereby changing the aerodynamic performance of the blade. The fan blade structure of the utility model limits the inner guide line of the blade so that the line-surface angle between the inner guide line and the horizontal plane, that is, the size of the guide angle α, is set within a value range. The larger the guide angle α, the smaller the resistance after the wind cuts into the fan blade, and the greater the pressure on the fan blade, that is, the stronger the air supply capacity of the fan blade. By limiting the guide angle of the fan blade structure, it is ensured that in a 14-inch fan blade structure, the fan blade structure of the utility model can achieve better quieting and wind gathering effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic structural diagram of a fan blade structure from one perspective of an embodiment of the utility model;

[0021] Figure 2 This is a structural schematic diagram of the fan blade structure from another perspective of an embodiment of the utility model.

[0022] icon:

[0023] 100 - transmission assembly; 110 - transmission shaft; 200 - blades; 210 - inner guide wire; 220 - first outer guide wire; 230 - second outer guide wire; 240 - apex. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0028] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example 1

[0031] This embodiment provides a fan blade structure to solve the problem of poor noise reduction effect or insufficient wind gathering ability of the fan blade in the related art.

[0032] See also Figure 1 , Figure 2 A fan blade structure includes a transmission assembly 100 and a blade 200. The transmission assembly 100 includes a transmission shaft 110. A plurality of blades 200 are provided, and the plurality of blades 200 are evenly distributed circumferentially on the transmission assembly 100. The connection between the blade 200 and the transmission shaft 110 is set as an inner guide line 210, the line between the two end points of the inner guide line 210 is set as a first straight line, the line-surface angle between the first straight line and the horizontal plane is set as a guide angle α, and the value range of the guide angle α satisfies: 35°≤α≤45°.

[0033] Specifically, when the fan blade structure of this embodiment is in use, the fan blade structure of this embodiment is loaded onto a fan, and the fan drives the blades 200 to rotate through the transmission shaft 110, so that the blades 200 deliver air.

[0034] In the fan blade structure, the design of the inner guide line 210 can affect the attachment and separation between the airflow and the blade 200, thereby changing the aerodynamic performance of the blade 200. The line-surface angle between the inner guide line 210 and the horizontal plane is set to a guide angle α. Within a reasonable range, the larger the guide angle α, the smaller the resistance after the wind cuts into the fan blade, the greater the pressure of the fan blade, that is, the stronger the air supply capacity of the fan blade, and correspondingly, the noise will also increase.

[0035] In this embodiment, the value range of the guide angle α is limited to between 35° and 45°, so that in a 14-inch fan blade structure, while ensuring the air supply capacity of the blade 200, the noise of the blade 200 during rotation can be reduced, achieving a silent and wind-gathering effect.

[0036] In some embodiments, for example, Figure 2 As shown, the blade 200 is provided with a vertex 240 at a position away from the transmission shaft 110, and the blade 200 includes a first outer guide line 220 and a second outer guide line 230. The first outer guide line 220 is an arc between an end point of the inner guide line 210 and the vertex 240, and the second outer guide line 230 is an arc between an end point on the inner guide line 210 away from the first outer guide line 220 and the vertex 240. The shape of the blade 200 is restricted by the inner guide line 210, the first outer guide line 220, and the second outer guide line 230, so that the blade 200 is set to be a closed shape surrounded by the inner guide line 210, the first outer guide line 220, and the second outer guide line 230.

[0037] Specifically, the outer guide line is the outline of the edge of the blade 200, the first outer guide line 220 is the leading edge of the blade 200, and the second outer guide line 230 is the trailing edge of the blade 200. Among them, the trailing edge of the blade 200 has a significant impact on the overall aerodynamic performance of the fan, especially in reducing noise and improving efficiency. Setting the first outer guide line 220 and the second outer guide line 230 as arcs can effectively reduce the noise of the blade 200 of this embodiment when rotating, and improve the silent effect of this embodiment. In addition, it can also cooperate with the inner guide line 210 and the guide angle to further improve the wind gathering effect of this embodiment.

[0038] In some embodiments, for example, Figure 2 As shown, the first outer guide line 220 is set as an arc line, and the curve diameter of the first outer guide line 220 is set to L1, which satisfies: 155mm≤L1≤160mm. Limiting the first outer guide line 220 means limiting the shape of the leading edge of the blade 200.

[0039] In some embodiments, for example, Figure 2As shown, the second outer guide line 230 is set as an arc line, and the curve diameter of the second outer guide line 230 is set to L2, which satisfies: 165mm≤L2≤170mm. The second outer guide line 230 is restricted, that is, the trailing edge of the blade 200 is restricted. Through the cooperation of the first outer guide line 220 and the second outer guide line 230, the shapes of the leading edge and the trailing edge of the blade 200 are optimized, so that this embodiment can effectively reduce the noise generated when the airflow contacts the leading edge of the blade 200 in a 14-inch fan, and reduce the turbulence and eddy current generated when the airflow separates from the trailing edge of the blade 200, thereby further reducing the noise.

[0040] In addition, by restricting the first outer guide line 220 and the second outer guide line 230 of the blade 200, the present embodiment can control the separation point of the airflow on the surface of the blade 200, thereby improving the dynamic performance of the airflow, increasing the wind pressure and air volume, and improving the wind gathering effect of the fan, thereby improving the practicality of the present embodiment.

[0041] Furthermore, by setting the first outer guide line 220 to a circular arc with a diameter between 155 mm and 160 mm, and setting the second outer guide line 230 to a circular arc with a diameter between 165 mm and 170 mm, the friction resistance between the blade 200 and the air can be reduced by controlling the shape of the outer guide lines, thereby improving the overall efficiency of the fan blade structure of this embodiment.

[0042] In some embodiments, for example, the thickness of the blade 200 gradually decreases along the direction of the fan blade from close to the transmission shaft 110 to away from the transmission shaft 110. By limiting the inner guide line 210, the first outer guide line 220, and the second outer guide line 230 of the blade 200, the wind pressure and wind volume generated by the blade 200 when rotating can be increased, and accordingly, the force borne by the blade 200 will also increase. The thickness of the blade 200 is limited so that it can match the shape of the blade 200, ensuring that the blade 200 can rotate stably and reliably.

[0043] It is understandable that the thickness of the blade 200 near the transmission shaft 110 is relatively large, which can ensure the overall strength of the blade 200 and the strength of the connection, ensure the reliability of the blade 200 during operation, and extend the service life of this embodiment. The thickness of the blade 200 gradually decreases from the direction close to the transmission shaft 110 to the direction away from the transmission shaft 110, which helps to reduce the thickness of the boundary layer on the surface of the blade 200, thereby reducing airflow separation, reducing resistance, and improving the efficiency of the fan. The thin section at the tip of the blade 200 can more effectively guide the airflow and reduce the generation of turbulence and eddy currents.

[0044] The variable cross-section blade 200 design enables the blade 200 of this embodiment to adapt to working environments under different circumstances. The thickness of the blade 200 gradually decreases, which can also reduce the overall weight of the blade 200, reduce production costs, and reduce the energy required by the fan to drive the blade 200, thereby improving the overall performance of the fan.

[0045] In some embodiments, the material of the blade 200 is set to acrylonitrile-butadiene-styrene copolymer (ABS) plastic. The thickness of the blade 200 near the transmission shaft 110 is set to B, satisfying: 1.8mm≤B≤1.9mm. ABS plastic is composed of three different monomer units, namely acrylonitrile (Acrylonitrile), which is used to give ABS plastic good chemical stability and a certain surface hardness; butadiene (Butadiene), which is used to provide high elasticity and impact resistance; styrene (Styrene), which is used to give ABS plastic good processing performance and surface gloss.

[0046] In summary, ABS plastic has the characteristics of high strength, good toughness, and easy processing and molding, so that the thickness of the blade 200 of this embodiment near the transmission shaft 110 in a 14-inch fan is set to between 1.8mm and 1.9mm, which can meet the strength requirements of the blade 200, ensuring that the blade 200 is light and thin while reducing the production difficulty of this embodiment. Good chemical corrosion resistance and heat resistance can extend the service life of this embodiment and ensure the working stability of the blade 200. Good dimensional stability facilitates precise control of the dimensional data of various parts of the blade 200 during production and processing. Easy to color, the surface can be chrome-plated and painted, which improves the aesthetics and chemical stability of the blade 200. Excellent electrical insulation performance can ensure the safety of this embodiment.

[0047] In some embodiments, for example, the thickness of the blade 200 at a position away from the transmission shaft 110 is set to C, satisfying: C = 1.5 mm. The thickness of the end of the blade 200 is limited so that the airflow separation of the blade 200 in the 14-inch fan is appropriate, the air resistance when the blade 200 rotates is reduced, and the efficiency of the fan is improved.

[0048] In some embodiments, the material of the blade 200 is exemplarily set to polypropylene (PP) hardened plastic. The thickness of the blade 200 at a position close to the transmission shaft 110 is set to B, satisfying: 1.9 mm ≤ B ≤ 2.0 mm.

[0049] Polypropylene (PP) is a common thermoplastic with good chemical stability, heat resistance and electrical insulation, but its hardness and rigidity are relatively low. In actual production, in order to improve the physical properties of polypropylene plastics, polypropylene materials are usually modified to increase their hardness and rigidity.

[0050] In the present embodiment, the hardening method of polypropylene is not limited. Exemplary, adding inorganic fillers such as calcium carbonate, talcum powder, glass fiber, mica, etc. to polypropylene can significantly improve the hardness and rigidity of polypropylene. In addition, polypropylene is blended with other rigid plastics such as polyamide (PA), polycarbonate (PC), polyester (PET), etc. to improve its hardness and heat resistance. Furthermore, by grafting modification, such as polypropylene grafted maleic anhydride (PP-g-MAH), the compatibility of polypropylene and filler can be improved, and the hardness and mechanical properties of the material can be further improved. Others, by physical methods such as heat treatment, stretching, etc., the hardness of polypropylene can also be improved to a certain extent.

[0051] In some embodiments, illustratively, the thickness of the blade 200 at a position away from the transmission shaft 110 is set to C, satisfying: 1.5 mm≤C≤1.6 mm.

[0052] In the 14-inch fan, a blade 200 made of polypropylene hardened plastic is used. The thickness of the blade 200 close to the transmission shaft 110 is set between 1.9 mm and 2.0 mm to ensure the overall strength of the blade 200 and the strength of the connection. The thickness of the blade 200 away from the transmission shaft 110 is set between 1.5 mm and 1.6 mm to ensure the overall performance of the blade 200.

[0053] Example 2

[0054] This embodiment also provides a fan, comprising a motor, a housing, and a blade structure in any one of the above embodiments, wherein the blade structure can be rotatably mounted in the housing, and the motor is used to drive the blade structure to rotate. The number of stacks of the motor is set to A, and the range of the number of stacks of the motor satisfies: 15≤A≤18; and the number of stacks of the motor is positively correlated with the size of the guide angle.

[0055] This embodiment has the fan blade structure of any of the above embodiments, and also has all the beneficial effects of the above fan blade structures, which will not be described in detail here.

[0056] The number of motor stacks usually refers to the number of core layers of the rotor or stator in the motor. In the construction of the motor, the stator and rotor are stacked by layers of silicon steel sheets (also called iron core sheets), which are separated by insulating materials to reduce eddy current losses. The number of motor stacks refers to the number of layers of these silicon steel sheets, that is, the thickness of the core. The number of motor stacks directly affects the performance of the motor. Generally speaking, the more stacks, the thicker the core, which means greater power and torque.

[0057] In this embodiment, the larger the guide angle of the blade 200 is, the more suitable the number of motor stacks is. In a 14-inch fan, the specific relationship between the number of motor stacks and the guide angle α of the blade 200 is shown in the following table:

[0058] Motor stacking number 15 16 17 18 Leading angle α° 35-37 37-39 38-42 41-45

[0059] In this way, the number of stacking of the motor is ensured to be compatible with the guide angle of the blade 200, so as to ensure the silent effect and wind gathering effect of the blade 200.

[0060] In some embodiments, illustratively, the inner guide line 210 of the blade 200 is also set as an arc, and the radius of curvature of the inner guide line 210 has an important influence on the guidance of air movement. Specifically, the larger the radius of curvature of the inner guide line 210, the more concentrated the air is toward the center of the fan blade structure under the guidance of the inner wall of the blade 200 after the wind cuts into the blade 200. On this basis, in a 14-inch fan, the radius of curvature of the inner guide line 210 is set to ρ, satisfying 0.16≤ρ≤0.18, and the radius of curvature of the inner guide line 210 is set between 0.16 and 0.18, which can further improve the wind gathering effect of this embodiment.

[0061] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A fan blade structure, characterized in that: include: A transmission assembly (100), the transmission assembly (100) comprising a transmission shaft (110); A blade (200), wherein a plurality of the blades (200) are provided, and the plurality of blades (200) are evenly distributed in the circumferential direction on the transmission assembly (100); The connection between the blade (200) and the transmission shaft (110) is set as an inner guide line (210), the line between the two end points of the inner guide line (210) is set as a first straight line, the line-surface angle between the first straight line and the horizontal plane is set as a guide angle α, and the value range of the guide angle α satisfies: 35°≤α≤45°.

2. The fan blade structure according to claim 1, characterized in that: The blade (200) is provided with a vertex (240) at a position away from the transmission shaft (110), and the blade (200) comprises a first outer guide line (220) and a second outer guide line (230); The first outer guide line (220) is an arc line between an end point of the inner guide line (210) and the vertex (240), and the second outer guide line (230) is an arc line between an end point on the inner guide line (210) away from the first outer guide line (220) and the vertex (240).

3. The fan blade structure according to claim 2, characterized in that: The first outer guide line (220) is set as an arc line, and the curve diameter of the first outer guide line (220) is set to L1, satisfying: 155mm≤L1≤160mm; The second outer guide wire (230) is set as an arc line, and the curve diameter of the second outer guide wire (230) is set to L2, satisfying: 165mm≤L2≤170mm.

4. The fan blade structure according to claim 1, characterized in that: The inner guide line of the blade is set to an arc line, and the curvature radius of the inner guide line is set to ρ, satisfying: 0.16≤ρ≤0.

18.

5. The fan blade structure according to claim 1, characterized in that: The thickness of the blade (200) gradually decreases along the direction of the fan blade from close to the transmission shaft (110) to far away from the transmission shaft (110).

6. The fan blade structure according to claim 5, characterized in that: The material of the blade (200) is set to be acrylonitrile-butadiene-styrene copolymer (ABS) plastic; The thickness of the blade (200) at a position close to the transmission shaft (110) is set to B, satisfying the following: 1.8 mm ≤ B ≤ 1.9 mm.

7. The fan blade structure according to claim 6, characterized in that: The thickness of the blade (200) at a position far from the transmission shaft (110) is set to C, satisfying: C=1.5 mm.

8. The fan blade structure according to claim 5, characterized in that: The material of the blade (200) is set to be polypropylene (PP) hardened plastic; The thickness of the blade (200) at a position close to the transmission shaft (110) is set to B, satisfying the following: 1.9 mm ≤ B ≤ 2.0 mm.

9. The fan blade structure according to claim 8, characterized in that: The thickness of the blade (200) at a position away from the transmission shaft (110) is set to C, satisfying the following: 1.5 mm ≤ C ≤ 1.6 mm.

10. A fan, characterized in that: It comprises a motor, a housing and a fan blade structure as claimed in any one of claims 1 to 9, wherein the fan blade structure is rotatably mounted in the housing, and the motor is used to drive the fan blade structure to rotate; The number of stacks of the motor is set to A, and the value range of the number of stacks of the motor satisfies: 15≤A≤18; and the number of stacks of the motor is positively correlated with the size of the guide angle.

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