A fan blade structure and axial flow fan device

Abstract

This utility model discloses a fan blade structure and an axial flow fan device. The fan blade structure includes: a fan wheel having an inlet side and an outlet side, the inlet side and the outlet side being arranged opposite to each other; and fan blades mounted on the periphery of the fan wheel, the inlet side of the fan blade corresponding to the inlet side of the fan wheel, and the outlet side of the fan blade corresponding to the outlet side of the fan wheel. The inlet side of the fan blade has a strip-shaped groove extending along the edge of the free end of the fan blade towards the edge of the mounting end of the fan blade on the fan wheel, the free end and the mounting end being opposite to each other. The technical solution of this utility model can generate a reverse wave on the inlet side of the fan blade. The reverse wave can reduce the impact of airflow on the inlet side of the fan blade, thereby reducing the generation of eddies and turbulence, and lowering noise.

Description

Technical Field

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

[0002] Most existing axial fans consist of a frame, blades, a rotor, and a motor. The blades are located around the rotor, which is rotatably mounted on the frame. The motor is mounted on the frame and drives the rotor to rotate via an output shaft, causing the blades to rotate continuously and accelerating airflow, which in turn causes airflow to flow continuously from the back of the fan to the front. However, when the blades are moving at high speed, the airflow flowing towards the blades easily comes into direct contact with the edges and surfaces of the blades, creating obstruction and resulting in a slower speed. Another portion of the airflow flows directly out from the gaps between the blades at a higher speed. When these two airflows converge, they generate eddies or turbulence, resulting in energy loss and noise.

[0003] In view of this, it is necessary to propose further improvements to the current fan blade structure. 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 fan blade structure and an axial flow fan device.

[0005] To achieve the above objectives, the present invention provides a technical solution as follows: a fan blade structure, comprising:

[0006] A wind turbine, wherein the wind turbine has an air inlet side and an air outlet side, and the air inlet side and the air outlet side are arranged opposite to each other;

[0007] The fan blades are installed around the wind turbine, with the air inlet side of the fan blades corresponding to the air inlet side of the wind turbine and the air outlet side of the fan blades corresponding to the air outlet side of the wind turbine.

[0008] The fan blade has a strip groove on its air inlet surface. The strip groove extends along the edge of the free end of the fan blade toward the edge of the mounting end where the fan blade is installed on the impeller. The free end and the mounting end are positioned opposite each other.

[0009] The width of the groove opening gradually narrows from the edge of the free end towards the edge of the mounting end where the fan blade is installed on the wind turbine.

[0010] The number of the strip grooves is multiple, and the multiple strip grooves are evenly distributed on the air inlet surface of the fan blade.

[0011] The edge of the free end of the fan blade is also folded, and the folded edge is perpendicular to the air inlet surface.

[0012] The folded edge is located at the middle position of the free end of the fan blade, and the folded edge is set in an arc shape.

[0013] The fan blade has a first side edge and a second side edge, and the folded edge leaves a gap with the first side edge and / or the second side edge.

[0014] To achieve the above objectives, the present invention provides a technical solution as follows: a fan blade structure, comprising:

[0015] A wind turbine, wherein the wind turbine has an air inlet side and an air outlet side, and the air inlet side and the air outlet side are arranged opposite to each other;

[0016] The fan blades are installed around the wind turbine, with the air inlet side of the fan blades corresponding to the air inlet side of the wind turbine and the air outlet side of the fan blades corresponding to the air outlet side of the wind turbine.

[0017] The air inlet surface of the fan blade is provided with an opening structure, which is located at the edge of the free end of the fan blade.

[0018] The opening structure includes a first recess, a second recess, and a third recess, which are arranged in a triangular pattern. The first recess is located near the free end edge of the fan blade, the second recess is located near the first side edge of the fan blade, and the third recess is located near the second side edge of the fan blade.

[0019] The opening structure includes a fixing ring, and there are multiple fan blades. The fixing ring is connected to the air outlet surface of the multiple fan blades to secure the multiple fan blades.

[0020] The fixing ring has an arc-shaped notch on the side of the fan blade's air outlet surface that is exposed.

[0021] To achieve the above objectives, one technical solution adopted by this utility model is to provide an axial flow fan device, including the aforementioned fan blade structure.

[0022] The technical solution of this utility model mainly includes a fan blade and a fan wheel. By setting a strip groove or opening structure on the air inlet side of the fan blade, when the fan blade rotates, airflow flows into the air inlet side of the fan blade. When the airflow passes through the strip groove or opening structure, a reverse wave is generated after the airflow flows into the strip groove or opening structure. This reverse wave can reduce or offset the direct impact of the airflow on the fan blade, thereby reducing noise. In addition, since the directional wave reduces or offsets part of the airflow movement, the impact of this part of the airflow on other airflows after merging with them is small, which can reduce energy loss and increase air volume. In summary, this utility model has a simple structure, low noise when the fan rotates at high speed, and can also increase air volume, thereby improving the user experience. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the air inlet side of the fan blade structure in the first embodiment of this utility model;

[0025] Figure 2 This is a partially enlarged schematic diagram of the fan blade structure according to the first embodiment of this utility model;

[0026] Figure 3 This is a schematic diagram of the air outlet side of the fan blade structure in the first embodiment of this utility model;

[0027] Figure 4 This is a schematic diagram of the oblique structure of the fan blade structure in the first embodiment of this utility model;

[0028] Figure 5 for Figure 4 A partial sectional view of the middle fan blade;

[0029] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0030] Figure 7 This is a schematic diagram of the air inlet side of the fan blade structure in the second embodiment of this utility model;

[0031] Figure 8 This is a schematic diagram of the air outlet side of the fan blade structure in the second embodiment of this utility model.

[0032] Label Explanation:

[0033] 101. Air inlet side; 102. Air outlet side;

[0034] 110. Wind turbine;

[0035] 120. Fan blade; 121. Slot; 122. Folded edge; 123. Gap; 124. Mounting end; 125. Free end; 126. First side edge; 127. Second side edge.

[0036] 130. Fixing ring; 131. Arc-shaped notch; 141. First concave hole; 142. Second concave hole; 143. Third concave hole.

[0037] 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

[0038] 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.

[0039] 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.

[0040] Unlike related technologies where fan blade structures generate significant noise during high-speed rotation, this invention provides a fan blade structure that, by creating grooves or openings on the air inlet surface, generates reverse waves to suppress noise, thereby reducing noise generation and improving the user experience. Please refer to the following embodiment for the specific structure of this fan blade.

[0041] Please refer to Figures 1 to 6 , Figure 1 This is a schematic diagram of the air inlet side of the fan blade structure in the first embodiment of this utility model; Figure 2 This is a partially enlarged schematic diagram of the fan blade structure according to the first embodiment of this utility model; Figure 3 This is a schematic diagram of the air outlet side of the fan blade structure in the first embodiment of this utility model; Figure 4 This is a schematic diagram of the oblique structure of the fan blade structure in the first embodiment of this utility model; Figure 5 for Figure 4 A partial sectional view of the middle fan blade; Figure 6 for Figure 5 Enlarged schematic diagram at point A. In this embodiment of the invention, this fan blade structure is applied to an axial flow fan device, and is particularly suitable for high-speed rotating axial flow fans. The fan blade structure includes:

[0042] The impeller 110 has an air inlet side 101 and an air outlet side 102, which are arranged opposite to each other. The impeller 110 is roughly cylindrical and has an internal installation space for installing components such as bearings and heat dissipation structures.

[0043] Fan blades 120 are mounted on the periphery of the impeller 110. The air inlet surface of the fan blades 120 corresponds to the air inlet side 101 of the impeller 110, and the air outlet surface of the fan blades 120 corresponds to the air outlet side 102 of the impeller 110. Multiple fan blades 120 are evenly distributed on the periphery of the impeller 110. The fan blades 120 are mounted obliquely on the impeller 110, meaning there is an angle between the surface of the fan blades 120 and the air inlet surface of the impeller 110. The fan blades 120 are generally curved, with the air inlet surface facing the air outlet side 102 being a convex curved surface and the air outlet surface facing the air outlet side 102 being a concave curved surface. In addition, the thickness of the fan blade 120 decreases from the middle to both sides, wherein the thickness of the first side edge 126 of the fan blade 120 is less than the thickness of the second side edge 127, and the rotation direction of the fan blade 120 rotates from the first side edge 126 to the second side edge 127.

[0044] The fan blade 120 has a slotted groove 121 on its air inlet surface. The slotted groove 121 extends from the edge of the free end 125 of the fan blade 120 to the edge of the mounting end 124 of the fan blade 120 where it is mounted on the impeller 110. The free end 125 and the mounting end 124 are positioned opposite each other. In this embodiment, the slotted groove 121 on the air inlet surface of the fan blade 120 allows the airflow to directly impact the air inlet surface of the fan blade 120 when the fan blade 120 rotates. When the airflow enters the slotted groove 121, it can form a reverse wave. This reverse wave can slow down or cancel out some of the airflow that does not enter the slotted groove 121. This portion of the airflow has a smaller impact on other airflows after merging with them, thus reducing energy loss and increasing the air volume. In addition, since this solution opens a strip groove 121 on the air inlet surface of the fan blade 120, it can save the material of the fan blade 120, reduce the weight of the fan blade 120, and drive the fan blade 120 to rotate faster with the same power motor, which is conducive to increasing the air volume.

[0045] In one specific embodiment, the width of the slot 121 gradually narrows from the edge of the free end 125 towards the edge of the mounting end 124 where the fan blade 120 is mounted on the impeller 110. The width of the slot 121 should be proportional to the blade surface area of ​​the fan blade 120; when the blade surface area of ​​the fan blade 120 is large, the slot 121 is wider, and when the blade surface area of ​​the fan blade 120 is small, the slot 121 is narrower. Correspondingly, the width of the free end 125 of the fan blade 120 is greater than the width of the mounting end 124, and the width of the slot 121 gradually narrows from the free end 125 towards the mounting end 124 to accommodate the blade surface requirements of the fan blade 120.

[0046] In one specific embodiment, there are multiple strip grooves 121, which are evenly distributed on the air inlet surface of the fan blade 120. In this embodiment, there are three strip grooves 121, which are evenly distributed on the air inlet surface of the fan blade 120. Furthermore, the strip grooves 121 can also be divided into multiple continuous segments. The specific structure of the strip grooves 121 can be flexibly designed according to actual needs, and is not limited here. In addition, the inner wall of the strip groove 121 is an arc surface, reducing the obstruction of the groove wall to the airflow and facilitating airflow outward. The wall thickness of the fan blade 120 gradually increases from the air inlet side to the air outlet side, and gradually thins at the edge of the air outlet side. This increases the stability of the fan blade 120 when it rotates at high speed.

[0047] In one embodiment, the edge of the free end 125 of the fan blade 120 also has a folded edge 122, which is perpendicular to the air inlet surface. The folded edge 122 can block the airflow from escaping from the side of the slot 121 near the free end 125 of the fan blade 120. Therefore, the directional waves generated by the airflow passing through the slot 121 are in approximately the same direction, avoiding interference between the directional waves.

[0048] In one embodiment, the folded edge 122 is located at the middle of the free end 125 of the fan blade 120. The folded edge 122 is arc-shaped, which reduces the direct impact of airflow on this side. The fan blade 120 has a first side edge 126 and a second side edge 127, and a gap 123 is left between the folded edge 122 and the first side edge 126 and / or the second side edge 127. This gap 123 reduces the direct contact between the folded edge 122 and the airflow. The length of the folded edge 122 is slightly longer than the groove depth of the strip groove 121.

[0049] Please refer to Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of the air inlet side of the fan blade structure in the second embodiment of this utility model; Figure 8 This is a schematic diagram of the air outlet side of the fan blade structure according to a second embodiment of the present invention. In this embodiment of the present invention, the fan blade structure includes:

[0050] The impeller 110 has an air inlet side 101 and an air outlet side 102, which are arranged opposite to each other. The impeller 110 is roughly cylindrical and has an internal installation space for installing components such as bearings and heat dissipation structures.

[0051] Fan blades 120 are mounted on the periphery of the impeller 110. The air inlet surface of the fan blades 120 corresponds to the air inlet side 101 of the impeller 110, and the air outlet surface of the fan blades 120 corresponds to the air outlet side 102 of the impeller 110. Multiple fan blades 120 are evenly distributed on the periphery of the impeller 110. The fan blades 120 are mounted obliquely on the impeller 110, meaning there is an angle between the surface of the fan blades 120 and the air inlet surface of the impeller 110. The fan blades 120 are generally curved, with the air inlet surface facing the air outlet side 102 being a convex curved surface and the air outlet surface facing the air outlet side 102 being a concave curved surface. In addition, the thickness of the fan blade 120 decreases from the middle to both sides, wherein the thickness of the first side edge 126 of the fan blade 120 is less than the thickness of the second side edge 127, and the rotation direction of the fan blade 120 rotates from the first side edge 126 to the second side edge 127.

[0052] The air inlet surface of the fan blade 120 is provided with an opening structure, which is located at the edge of the free end 125 of the fan blade 120. In this embodiment, the air inlet surface of the fan blade 120 has an opening structure. When the fan blade 120 rotates, the airflow directly impacts the air inlet surface of the fan blade 120. When the airflow enters the opening structure, the airflow entering the opening structure can form a reverse wave. This reverse wave can slow down or cancel out part of the airflow that does not enter the opening structure. After this part of the airflow merges with other airflows, its impact on other airflows is small, which can reduce energy loss and increase the air volume. In addition, the opening structure also helps to reduce the weight of the fan blade 120 and increase the air volume.

[0053] In one specific embodiment, the opening structure includes a first recess 141, a second recess 142, and a third recess 143. The first recess 141, second recess 142, and third recess 143 are triangularly distributed. The first recess 141 is located near the edge of the free end 125 of the fan blade 120, the second recess 142 is located near the first side edge of the fan blade 120, and the third recess 143 is located near the second side edge of the fan blade 120. All three recesses are located on the air inlet surface of the fan blade 120 and do not penetrate the air outlet surface of the fan blade 120. The area of ​​the first recess 141 is larger than that of the second recess 142, and the area of ​​the second recess 142 is larger than that of the third recess 143. Considering the airflow velocity of the first recess 141, second recess 142, and third recess 143, the depth of each recess can be flexibly set according to requirements and is not limited here.

[0054] In one specific embodiment, the opening structure includes a retaining ring 130, and there are multiple fan blades 120. The retaining ring 130 is connected to the air outlet surface of the multiple fan blades 120 to secure them. In this embodiment, there are nine fan blades 120, and all nine fan blades 120 are fixedly connected to the retaining ring 130. The retaining ring 130 can increase the stability of the fan blades 120.

[0055] Specifically, the fixing ring 130 has an arc-shaped notch 131 on the side of the fan blade 120 that is exposed to the air outlet. This arc-shaped notch 131 can reduce the direct impact of airflow on the fixing ring 130 and also reduce the weight of the fixing ring 130, thereby reducing the weight of the entire fan blade 120.

[0056] In an embodiment of this utility model, the axial fan device includes the aforementioned fan blade structure. The specific structure of the fan blade structure is described in the above embodiments and will not be repeated here. Since the axial fan device of this solution adopts all the technical solutions of all the above-described fan blade structure embodiments, it possesses at least all the advantages and beneficial effects brought about by the technical solutions of the above-described fan blade structure embodiments, which will not be elaborated upon here.

[0057] 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 fan blade structure, characterized in that, The fan blade structure includes: A wind turbine, wherein the wind turbine has an air inlet side and an air outlet side, and the air inlet side and the air outlet side are arranged opposite to each other; The fan blades are installed around the wind turbine, with the air inlet side of the fan blades corresponding to the air inlet side of the wind turbine and the air outlet side of the fan blades corresponding to the air outlet side of the wind turbine. The fan blade has a strip groove on its air inlet surface. The strip groove extends along the edge of the free end of the fan blade toward the edge of the mounting end where the fan blade is installed on the impeller. The free end and the mounting end are positioned opposite each other.

2. The fan blade structure as described in claim 1, characterized in that, The width of the groove gradually narrows from the edge of the free end toward the edge of the mounting end where the fan blade is installed on the wind turbine.

3. The fan blade structure as described in claim 1, characterized in that, The number of the strip grooves is multiple, and the multiple strip grooves are evenly distributed on the air inlet surface of the fan blade.

4. The fan blade structure as described in claim 1, characterized in that, The edge of the free end of the fan blade also has a folded edge, which is perpendicular to the air inlet surface.

5. The fan blade structure as described in claim 4, characterized in that, The folded edge is located at the middle of the free end of the fan blade, and the folded edge is set in an arc shape; The fan blade has a first side edge and a second side edge, and the folded edge leaves a gap with the first side edge and / or the second side edge.

6. A fan blade structure, characterized in that, The fan blade structure includes: A wind turbine, wherein the wind turbine has an air inlet side and an air outlet side, and the air inlet side and the air outlet side are arranged opposite to each other; The fan blades are installed around the wind turbine, with the air inlet side of the fan blades corresponding to the air inlet side of the wind turbine and the air outlet side of the fan blades corresponding to the air outlet side of the wind turbine. The air inlet surface of the fan blade is provided with an opening structure, which is located at the edge of the free end of the fan blade.

7. The fan blade structure as described in claim 6, characterized in that, The opening structure includes a first recess, a second recess, and a third recess, which are arranged in a triangular pattern. The first recess is located near the free end edge of the fan blade, the second recess is located near the first side edge of the fan blade, and the third recess is located near the second side edge of the fan blade.

8. The fan blade structure as described in claim 6, characterized in that, The opening structure includes a fixing ring, and there are multiple fan blades. The fixing ring is connected to the air outlet surface of the multiple fan blades to secure the multiple fan blades.

9. The fan blade structure as described in claim 8, characterized in that, The fixing ring has an arc-shaped notch on the side of the fan blade's air outlet surface that is exposed.

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

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