A new fan blade structure and axial flow fan

Abstract

The utility model discloses a novel fan blade structure and axial flow fan, wherein, the novel fan blade structure includes: the hub, the first installation department has to the hub's circumference side, a plurality of fan blades, every the fan blade is assembled to the first installation department, and a plurality of the fan blade is evenly installed to the first installation department and is annular distribution along the circumference side of the hub, the fan blade has the fan blade outer edge away from the first installation department, and the fan blade outer edge is arcly arranged, wherein, the fan blade outer edge is equipped with the edge recess, and the edge recess extends along the length direction of fan blade outer edge and the edge recess is arcly distributed. The utility model discloses a technical scheme through setting up the edge recess in the fan blade outer edge, can guide the smooth airflow of the fan blade rotation through the edge recess, can reduce the airflow to the obstruction of fan blade, and the edge recess can also guide the airflow, reduce the fan blade tip airflow leakage, can improve the air volume of fan blade.

Description

Technical Field

[0001] This utility model relates to an axial flow fan, and more particularly to a novel fan blade structure and an axial flow fan. Background Technology

[0002] Axial fans are a widely used type of fan. Their principle involves a motor driving the fan blades to rotate. Airflow enters from the back of the blades, is accelerated by the blades, and exits from the front. The airflow velocity is directly proportional to the blade rotation speed. As the blades rotate, their edges continuously cut and compress the airflow. When the blade edges are thick, this compression can lead to air leakage at the blade tips, creating vortices that affect the blade rotation speed and the amount of airflow.

[0003] Therefore, it is necessary to further improve the current structure of the fan blades. Utility Model Content

[0004] To solve at least one of the above-mentioned technical problems, the main objective of this utility model is to provide a novel fan blade structure and axial flow fan.

[0005] To achieve the above objectives, the present invention provides a novel fan blade structure, comprising: A wheel hub, wherein the circumference of the wheel hub has a first mounting portion; Multiple fan blades, each fan blade is obliquely mounted on a first mounting part, the multiple fan blades are evenly mounted on the first mounting part and are distributed in a ring along the periphery of the hub, the fan blades have an outer edge away from the first mounting part, and the outer edge of the fan blades is arc-shaped; The fan blade has an edge groove on its outer edge, which extends along the length of the outer edge of the fan blade and is distributed in an arc shape.

[0006] As one embodiment of the present utility model, the edge groove includes a first groove surface, a second groove surface and two end surfaces. The first groove surface and the second groove surface are arranged opposite to each other, and the two end surfaces are arranged opposite to each other. The first groove surface and the second groove surface are connected to each other through two cross-sections. At least one of the first groove surface and the second groove surface is an inclined arc surface.

[0007] In one embodiment of this utility model, the groove opening of the edge groove is configured as a wide-mouth, narrow-bottom shape, or At least one rib is provided at the opening of the edge groove. One end of the rib is connected to the first groove surface, and the other end of the rib is connected to the second groove surface. When there are two or more ribs, the ribs are distributed in parallel, and the top of each rib is flush with the opening surface of the edge groove.

[0008] In one embodiment of this utility model, the edge groove includes multiple groove segments, which are sequentially distributed to form the edge groove. These multiple groove segments are arranged in an arc shape along the outer edge of the fan blade. The groove wall of the edge groove is recessed with at least one step. The step includes a first inner edge surface and a second inner edge surface disposed opposite to each other. The first inner edge surface is located on the first groove surface, and the second inner edge surface is located on the second groove surface. The first inner edge surface extends along the length direction of the outer edge of the fan blade on the first groove surface, and the second inner edge surface extends along the length direction of the outer edge of the fan blade on the second groove surface.

[0009] In one embodiment of this utility model, at least one end of the edge groove is formed with an opening, and the space at the opening is in communication with the inner space of the edge groove.

[0010] In one embodiment of this utility model, the opening includes a first opening surface and a second opening surface, the first opening surface and the second opening surface are disposed opposite to each other, and either the first opening surface or the second opening surface is disposed at an inclination.

[0011] In one embodiment of this utility model, the opening is configured as a wide mouth and narrow bottom.

[0012] In one embodiment of this utility model, the plurality of fan blades are integrally formed with the hub.

[0013] As one embodiment of this utility model, the rear end of the wheel hub has a mounting groove, and the mounting groove has an assembly hole.

[0014] To achieve the above objectives, another technical solution adopted by this utility model is to provide an axial flow fan, including the novel fan blade structure described above.

[0015] The technical solution of this utility model mainly includes a hub and multiple fan blades disposed on the hub. Each fan blade has an outer edge with an edge groove. This solution, by creating an edge groove on the outer edge of the fan blade, allows airflow to be smoothly guided through the groove during fan blade rotation, reducing airflow obstruction. The edge groove also guides airflow, reducing airflow leakage at the blade tip and increasing the airflow volume. Furthermore, the edge groove structure helps reduce the weight of the fan blade, making the overall structure lighter and saving materials. In addition, the edge groove is arc-shaped along the length of the outer edge of the fan blade, further facilitating smooth airflow and enhancing the airflow guiding effect. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a novel fan blade from one perspective according to an embodiment of the present invention; Figure 2 This is a structural schematic diagram of the novel fan blade from another perspective of one embodiment of the present invention; Figure 3 This is a cross-sectional view of a novel fan blade according to an embodiment of the present invention. Figure 4 This is a cross-sectional view of a novel fan blade according to an embodiment of the present invention from another perspective; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a cross-sectional view of a novel fan blade according to another embodiment of the present invention. Figure 7 This is a cross-sectional view of another embodiment of the novel fan blade from another perspective; Figure 8 for Figure 7 Enlarged diagram of point B in the middle.

[0018] Label Explanation: 10. Hub; 11. First mounting part; 12. Mounting slot; 13. Assembly hole; 20. Fan blade; 21. Outer edge of fan blade; 22. Edge groove; 221. First groove surface; 222. Second groove surface; 223. End face; 224. Step; 225. First inner edge surface; 226. Second inner edge surface. 31. Air inlet side; 32. Air outlet side.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that the descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0022] Unlike related technologies where the fan blade edges are thick, causing airflow obstruction and eddy currents during blade rotation, this invention provides a novel fan blade structure. By creating edge grooves on the outer edge of the fan blade, airflow is smoothly guided through these grooves during blade rotation, reducing airflow obstruction. The edge grooves also guide airflow, reducing airflow leakage at the blade tip and increasing the airflow volume. The specific structure of this novel fan blade is described in the following embodiment.

[0023] Please refer to Figures 1 to 4 , Figure 1 This is a schematic diagram of the structure of a novel fan blade from one perspective according to an embodiment of the present invention; Figure 2 This is a structural schematic diagram of the novel fan blade from another perspective of one embodiment of the present invention; Figure 3 This is a cross-sectional view of a novel fan blade according to an embodiment of the present invention. Figure 4 This is a cross-sectional view from another perspective of a novel fan blade according to an embodiment of the present invention. In this embodiment, the novel fan blade structure is applied to an axial flow fan for heat dissipation or convection. The novel fan blade structure includes: a hub 10 and fan blades 20.

[0024] A hub 10 has a first mounting portion 11 on its circumference. The hub 10 is located at the center of the novel fan blade 20 structure and is generally hollow and cylindrical. The circumference of the hub 10 is an annular surface, and the first mounting portion 11 is provided on the circumferential surface. The first mounting portion 11 has an insertion interface for inserting the fan blade 20. To improve the stability of the fan blade 20 assembly, a limiting mechanism can be provided at the insertion interface to limit the insertion position of the fan blade 20 and improve the stability of the fit between the fan blade 20 and the hub 10. The limiting mechanism can be a limiting block, a limiting strip, a limiting groove, etc. When the limiting mechanism is a limiting block or a limiting strip, a limiting groove can be provided on the fan blade 20 so that when the fan blade 20 is fitted with the hub 10, the limiting action of the limiting block or limiting strip and the limiting groove fixes the fan blade 20 to the circumference of the hub 10. When the limiting structure is a limiting groove, a limiting block or limiting strip can be provided on the fan blade 20. Through the limiting effect of the limiting block or limiting strip and the limiting groove, the fan blade 20 and the hub 10 are fixed. There are multiple first mounting parts 11, and the specific number corresponds to the number of fan blades 20 installed.

[0025] Multiple fan blades 20 are mounted obliquely to the first mounting portion 11. These multiple fan blades 20 are evenly mounted on the first mounting portion 11 and arranged in a ring around the periphery of the hub 10. Each fan blade 20 has an outer edge 21 away from the first mounting portion 11, and this outer edge 21 is arc-shaped. The number of fan blades 20 can be set according to specific needs and is not limited here. In this embodiment, there are 7 fan blades 20. The 7 fan blades 20 are arranged in a ring around the periphery of the hub 10. Each fan blade 20 has an insertion edge that can be inserted into the first mounting portion 11 of the hub 10. Each fan blade 20 also has an outer edge 21, which is opposite to the insertion edge. Furthermore, when multiple fan blades 20 are installed, the fan blades 20 are set at a certain angle to the hub 10, which is beneficial for the fan blades 20 to drive airflow.

[0026] The outer edge 21 of the fan blade has an edge groove 22, which extends along the length of the outer edge 21 and is arc-shaped. In this design, the edge groove 22 facilitates smooth airflow and prevents eddies caused by air leakage due to airflow compression at the outer edge 21 when the fan blade 20 rotates, thus increasing the airflow volume of the fan blade 20. Simultaneously, the edge groove 22 reduces airflow obstruction at the outer edge 21, which helps increase the rotational speed of the fan blade 20. Furthermore, the edge groove 22 reduces the overall weight of the fan blade 20, saving materials and offering the advantage of low cost. Moreover, the arc-shaped distribution of the edge groove 22 further reduces airflow obstruction, further promoting smooth airflow. The edge groove 22 is distributed along the arc-shaped outer edge of the fan blade 21. The overall design is non-linear, which can reduce the obstruction effect of the groove surface in the edge groove 22 on the airflow when the fan blade rotates, and is conducive to guiding the airflow.

[0027] In one specific embodiment, the edge groove 22 includes a first groove surface 221, a second groove surface 222, and two end surfaces 223. The first groove surface 221 and the second groove surface 222 are disposed opposite to each other, and the two end surfaces 223 are disposed opposite to each other. The first groove surface 221 and the second groove surface 222 are connected to each other through two cross-sections. At least one of the first groove surface 221 and the second groove surface 222 is an inclined arc surface. Having either the first groove surface 221 or the second groove surface 222 as an inclined arc surface facilitates smooth airflow into the edge groove 22, reduces the obstruction of the edge groove 22 to the airflow, and reduces noise caused by the contact between the edge groove 22 and the airflow when the fan blade 20 rotates at high speed. In the above scheme, the first groove surface 221 and the second groove surface 222 can both be set as inclined arc surfaces to further reduce the obstruction of the airflow.

[0028] Specifically, the groove opening of the edge groove 22 is configured as a wide-mouth, narrow-bottom structure. This wide-mouth, narrow-bottom structure creates a structure where the groove opening is wide and the groove bottom opening is narrow, i.e., a wide-mouth, narrow-bottom structure. When the fan blade rotates, it can reduce the obstruction effect of the groove surface in the edge groove 22 on the airflow, which is conducive to guiding the airflow through.

[0029] To reduce leakage flow from the opening of the edge groove 22, at least one rib is provided at the opening of the edge groove 22. One end of the rib is connected to the first groove surface 221, and the other end is connected to the second groove surface 222. When there are two or more ribs, the ribs are distributed in parallel, and the top of each rib is flush with the groove opening surface of the edge groove 22. The ribs span between the first groove surface 221 and the second groove surface 222. The size and shape of the ribs can be designed according to actual requirements and are not limited here. Dividing the edge groove 22 into multiple segments by multiple ribs is beneficial for segmented control of leakage flow. In addition, the angle between the ribs and the first groove surface 221 and the second groove surface 222 in the edge groove 22 can be designed according to actual requirements to reduce leakage flow at the groove opening of the edge groove 22. Furthermore, the top of the rib is flush with the groove opening surface of the edge groove 22, resulting in a smoother overall appearance. When there are multiple ribs, patterns can also be printed on the multiple ribs. In actual processing, the aforementioned ribs are integrally formed with the first groove surface 221 and the second groove surface 222.

[0030] In one specific embodiment, the edge groove 22 comprises multiple groove segments, which are sequentially distributed to form the edge groove 22. These groove segments are arranged in an arc shape along the outer edge 21 of the fan blade. The sequential distribution of the multiple groove segments can include adjacent groove segments connected together, with the multiple groove segments continuously distributed; or it can include adjacent groove segments spaced apart, with the multiple groove segments spaced apart. When two groove segments are spaced apart, the space between them is a connecting entity, and the size of this space is smaller than the size of the groove, which helps increase the structural strength of the outer edge 21 of the fan blade. The multiple groove segments prevent the entire edge groove 22 from becoming hollow, which helps improve the structural strength of the outer edge 21 of the fan blade. The size parameters of each groove segment can be flexibly set according to specific requirements, and are not limited here. The multiple groove segments of the edge groove 22 can also be arranged in an array to avoid excessive airflow concentration in the edge groove 22. When the multiple groove segments are arranged in an array, the first and last rows of grooves are inclined, and the two sides of the middle groove are connected to the edges of the first and last rows of grooves, respectively, so that the edge groove 22 has a wide-mouth, narrow-bottom structure.

[0031] Please refer to Figures 6 to 8 , Figure 6 This is a cross-sectional view of a novel fan blade according to another embodiment of the present invention. Figure 7 This is a cross-sectional view of another embodiment of the novel fan blade from another perspective; Figure 8 for Figure 7Enlarged schematic diagram at point B. For cases where the groove depth of the edge groove 22 is relatively deep, to ensure the structural strength of the outer edge 21 of the fan blade, this solution provides at least one step 224 on the groove wall surface of the edge groove 22. Specifically, the groove wall surface of the edge groove 22 is recessed with at least one step 224. The step 224 includes a first inner edge surface 225 and a second inner edge surface 226 disposed opposite to each other. The first inner edge surface 225 is located on the first groove surface 221, and the second inner edge surface 226 is located on the second groove surface 222. The first inner edge surface 225 extends along the length direction of the outer edge of the fan blade on the first groove surface 221, and the second inner edge surface 226 extends along the length direction of the outer edge of the fan blade on the second groove surface 222. The number of steps 224 can be one, two, or more. When the number of steps 224 is two or more, the multiple steps 224 are arranged in a trapezoidal shape from near the opening of the edge groove 22 towards near the bottom of the edge groove 22. The step 224 can extend on one side of the groove wall of the edge groove 22, or it can extend simultaneously on both sides of the groove wall of the edge groove 22. For example, the step 224 includes a first inner edge surface 225 and a second inner edge surface 226 arranged opposite to each other. The first inner edge surface 225 extends along the length direction of the outer edge of the fan blade on the first groove surface 221, and the second inner edge surface 226 extends along the length direction of the outer edge of the fan blade on the second groove surface 222, ultimately forming an inner annular platform around the groove wall of the edge groove 22. It should be noted that, considering the obstruction of airflow by the planar step 224, the first inner edge surface 225, and the second inner edge surface 226, the surfaces of the step 224, the first inner edge surface 225, and the second inner edge surface 226 can also be designed as arc-shaped surfaces to facilitate airflow guidance. In a specific embodiment, at least one end of the edge groove 22 has an opening, and the space at the opening communicates with the inner space of the edge groove 22. The opening allows airflow to easily enter or exit the edge groove 22 directly, reducing the obstruction of the edge groove 22's end face 223. The two ends of the edge groove 22 are its two end faces 223, both of which can be open. This facilitates direct airflow into the edge groove 22 and exits through the other opening, creating smoother channels at both ends of the edge groove 22 and improving airflow guidance.

[0032] Specifically, the opening includes a first opening surface and a second opening surface, which are arranged opposite to each other, and either the first or second opening surface is inclined. The inclined orientation of either the first or second opening surface results in a wider opening, which helps reduce airflow obstruction. Both the first and second opening surfaces can be inclined simultaneously, which facilitates airflow absorption, and the edge groove 22 guides the absorbed airflow.

[0033] Specifically, the opening is designed with a wide mouth and a narrow bottom. This wide-mouth, narrow-bottom structure creates a structure where the opening is wide at the top and narrow at the bottom, i.e., a wide-mouth, narrow-bottom structure. When the fan blades rotate, this reduces the obstruction of the airflow by the opening surface, which is beneficial for guiding the airflow through.

[0034] Specifically, the multiple fan blades 20 are integrally formed with the hub 10. This structure improves the overall stability of the fan blades 20 and hub 10, while also facilitating manufacturing.

[0035] Additionally, the rear end of the hub 10 has a mounting groove 12, within which is a mounting hole 13. This mounting hole 13 can be used to limit and fix the mounting screws, facilitating the assembly of the fan blade 20. The fan blade 2020 has an air inlet side 31 and an air outlet side 32, which are arranged opposite to each other. The mounting groove 12 is located on the same side as the air outlet side 32. The mounting groove 12 can also be used to mount a motor to drive the fan blade 20 to rotate at high speed.

[0036] In the embodiments of this utility model, the axial flow fan includes the novel fan blade structure described above. The specific structure of this novel fan blade structure is described in the above embodiments and will not be repeated here. Since the axial flow fan of this solution adopts all the technical solutions of all the embodiments of the novel fan blade structure described above, it possesses at least all the advantages and beneficial effects brought about by the technical solutions of the embodiments of the novel fan blade structure described above, and will not be repeated here.

[0037] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the technical concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A novel fan blade structure, characterized in that, The novel fan blade structure includes: A wheel hub, wherein the circumference of the wheel hub has a first mounting portion; Multiple fan blades, each fan blade is obliquely mounted on a first mounting part, the multiple fan blades are evenly mounted on the first mounting part and are distributed in a ring along the periphery of the hub, the fan blades have an outer edge away from the first mounting part, and the outer edge of the fan blades is arc-shaped; The fan blade has an edge groove on its outer edge, which extends along the length of the outer edge of the fan blade and is distributed in an arc shape.

2. The novel fan blade structure as described in claim 1, characterized in that, The edge groove includes a first groove surface, a second groove surface, and two end surfaces. The first groove surface and the second groove surface are arranged opposite to each other, and the two end surfaces are arranged opposite to each other. The first groove surface and the second groove surface are connected to each other through two cross-sections. At least one of the first groove surface and the second groove surface is an inclined arc surface.

3. The novel fan blade structure as described in claim 2, characterized in that, The groove opening of the edge groove is set in a wide-mouth, narrow-bottom shape, or At least one rib is provided at the opening of the edge groove. One end of the rib is connected to the first groove surface, and the other end of the rib is connected to the second groove surface. When there are two or more ribs, the ribs are distributed in parallel, and the top of each rib is flush with the opening surface of the edge groove.

4. The novel fan blade structure as described in claim 2, characterized in that, The edge groove includes multiple groove segments, which are sequentially distributed to form the edge groove. These groove segments are arranged in an arc shape along the outer edge of the fan blade. The groove wall of the edge groove is recessed with at least one step. The step includes a first inner edge surface and a second inner edge surface disposed opposite to each other. The first inner edge surface is located on the first groove surface, and the second inner edge surface is located on the second groove surface. The first inner edge surface extends along the length direction of the outer edge of the fan blade on the first groove surface, and the second inner edge surface extends along the length direction of the outer edge of the fan blade on the second groove surface.

5. The novel fan blade structure as described in claim 4, characterized in that, At least one end of the edge groove has an opening, and the space at the opening is in communication with the inner space of the edge groove.

6. The novel fan blade structure as described in claim 5, characterized in that, The opening includes a first opening surface and a second opening surface, the first opening surface and the second opening surface are disposed opposite to each other, and either the first opening surface or the second opening surface is disposed at an angle.

7. The novel fan blade structure as described in claim 5, characterized in that, The opening is designed with a wide mouth and a narrow bottom.

8. The novel fan blade structure as described in claim 1, characterized in that, The fan blades and the hub are integrally formed.

9. The novel fan blade structure as described in claim 1, characterized in that, The rear end of the wheel hub has a mounting groove, and the mounting groove has an assembly hole.

10. An axial flow fan, characterized in that, The axial fan includes the novel blade structure as described in any one of claims 1 to 9.

Images