Vortex generator and axial flow fan

Abstract

The invention provides a vortex generator and an axial flow fan, and belongs to the technical field of axial flow fans, the vortex generator comprises two fin units, and the two fin units extend in the direction inclined to airflow and are far away from each other; the top of each fin unit is provided with a groove, and the grooves penetrate to the front side and the rear side of the fin unit in the extending direction of the fin unit. The opposite sides of the two fin units are respectively provided with a first transition surface, and the first transition surfaces extend to the groove from the opposite sides; the opposite sides of the two fin units are respectively provided with a second transition surface, and the second transition surfaces extend to the groove from the opposite sides. Wherein the bottoms of the fin units are used for being fixed to a rotor main shaft, the grooves are sunken in the radial direction of the rotor main shaft, and the axial flow fan comprises the vortex generator. According to the vortex generator and the axial flow fan, airflow attachment of the front edge and the rear edge of the blade can be effectively promoted, then the lift force of the blade is improved, and the flow separation problem is delayed.

Description

Technical Field

[0001] The present invention belongs to the technical field of axial flow fans, and more specifically, relates to a vortex generator and an axial flow fan. Background Art

[0002] Axial flow fans are widely used in many fields such as aerospace, wind power generation and automotive industry. Vortex generators play an important role in improving the performance of axial flow fans. Specifically, vortex generators can delay or prevent flow separation on the blade surface by inducing vortices, thereby reducing energy loss and improving the operating efficiency of the fan.

[0003] In the prior art, vortex generators mostly adopt geometric shapes similar to blades, such as rectangular, triangular or trapezoidal structures, and traditional vortex generators are usually set at the root of blades. Although they can generate vortices, they are not effective in delaying flow separation on the blade surface, and there are still problems of large energy loss and low fan operating efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a vortex generator and an axial flow fan, aiming to solve the technical problems that the existing vortex generators generate insufficient disturbance vortices, severe flow separation problems, resulting in large energy losses and low fan operating efficiency.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a vortex generator, comprising two fin units, the two fin units extending along an inclined direction to the airflow direction and away from each other;

[0006] A groove is provided on the top of each fin unit, and the groove passes through the front and rear sides of the fin unit along the extension direction of the fin unit;

[0007] The opposite sides of the two fin units are respectively provided with a first transition surface, and the first transition surface extends from the opposite sides to the groove; the opposite sides of the two fin units are respectively provided with a second transition surface, and the second transition surface extends from the opposite sides to the groove;

[0008] Wherein, the bottom of the fin unit is used to be fixed on the rotor main shaft, and the groove is recessed along the radial direction of the rotor main shaft.

[0009] In a possible implementation, the inclination angle of the fin unit along the airflow direction is 10°-35°.

[0010] In some embodiments, the length of the fin unit is 3 cm-7 cm, the width is 1.5 cm-3.5 cm, and the radial height of the fin unit along the rotor main axis is 30%-70% of the length of the fin unit.

[0011] Exemplarily, the groove is an arc-shaped groove, the first transition surface and the second transition surface are arc-shaped structures with equal radius, and the radius of the arc-shaped structure is not less than twice the radius of the arc-shaped groove.

[0012] In some embodiments, a plurality of the grooves are provided, and the plurality of the grooves are distributed at intervals along the circumference of the rotor main shaft.

[0013] In a possible implementation, a mounting unit is correspondingly provided at the bottom of each fin unit, and the fin unit is fixed to the outer surface of the rotor main shaft through the mounting unit; and foam adhesive is filled between the mounting unit, the outer surface of the rotor main shaft, and the fin unit.

[0014] Exemplarily, the installation unit includes:

[0015] A limit block is arranged at the bottom of the fin unit; the limit block is in a first trapezoidal structure, and the short side of the first trapezoidal structure is connected to the fin unit;

[0016] The base has a mounting groove matched with the limit block on the top, and a curved surface matched with the outer peripheral surface of the rotor main shaft on the bottom, and the curved surface is fixedly connected to the outer peripheral surface of the rotor main shaft.

[0017] In some embodiments, the installation unit includes:

[0018] A mounting block, the cross section of which is a second trapezoidal structure, the short side of the second trapezoidal structure is connected to the fin unit, the long side of the second trapezoidal structure is provided with a filling groove recessed toward the short side, and a group of sliding grooves are respectively provided on both sides of the filling groove;

[0019] Two groups of adjustment plates, corresponding to the two groups of sliding grooves one by one and slidably connected, one end of the adjustment plate is connected to the groove bottom of the corresponding sliding groove through an elastic member, and the other end is fixed to the rotor main shaft;

[0020] Wherein, when the mounting unit is fixed to the outer surface of the rotor main shaft, the sliding groove and the filling groove are both filled with foam adhesive.

[0021] Exemplarily, the adjustment plate includes:

[0022] A sliding portion, one end of which is fixed to the elastic member and the other end of which extends out of the sliding groove;

[0023] The connecting portion is fixed to the extended end of the sliding portion and is limited outside the sliding groove; the side of the connecting portion away from the sliding groove is an arc-shaped surface adapted to the outer peripheral surface of the rotor main shaft.

[0024] Compared with the prior art, the solution shown in the embodiment of the present application has the following effects:

[0025] 1) The grooves, the first transition surface and the second transition surface on the fin unit in the present application are used to form a stable vortex field to enhance airflow attachment and improve aerodynamic performance.

[0026] 2) By making the two groups of fin units extend in an inclined direction to the airflow direction and arranged away from each other, the vortex field formed on the blade surface is more uniform, thereby promoting the airflow attachment at the leading and trailing edges of the blade, thereby increasing the lift of the blade and delaying the occurrence of flow separation problems;

[0027] 3) By installing the vortex generator on the rotor main shaft, on the one hand, the adverse effects of installing it at the blade root on the blade strength and airflow strength are avoided; on the other hand, the convenience of installation is improved, the installation and repair costs are reduced, and the operation is simple; and the disturbed vortex formed by the vortex generator installed on the rotor main shaft has a significant improvement in delaying the flow separation problem, has a good flow field disturbance effect, and can effectively improve the aerodynamic performance.

[0028] In a second aspect, an embodiment of the present invention further provides an axial flow fan, comprising:

[0029] Rotor spindle;

[0030] A plurality of groups of blades are arranged at intervals along the circumference of the rotor main shaft; and

[0031] A plurality of groups of the vortex generators are arranged at intervals along the circumference of the rotor main shaft;

[0032] Wherein, the vortex generators are all located on the front side of the blade along the airflow direction and close to the bottom of the blade.

[0033] The axial flow fan provided in the present application has all the beneficial effects of the above-mentioned vortex generators because it adopts multiple groups of the above-mentioned vortex generators. It can effectively promote the airflow attachment at the leading edge and trailing edge of the blade, thereby increasing the lift of the blade, delaying the occurrence of flow separation problems, and effectively improving the installation performance of the vortex generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 Schematic diagram of the structure of the fin unit of the vortex generator provided in the embodiment of the present invention Figure 1 ;

[0036] Figure 2 A schematic structural diagram of the installation cross section of two fin units provided in an embodiment of the present invention;

[0037] Figure 3 A structural schematic diagram of the installation positions of two fin units provided in an embodiment of the present invention;

[0038] Figure 4 Schematic diagram of the structure of the fin unit of the vortex generator provided in the embodiment of the present invention Figure 2 ;

[0039] Figure 5 Schematic diagram of the structure of the vortex generator provided in the embodiment of the present invention Figure 1 ;

[0040] Figure 6 Schematic diagram of the structure of the vortex generator provided in the embodiment of the present invention Figure 2 ;

[0041] Figure 7 For attachment Figure 6 Schematic diagram of the enlarged structure at point A in the middle.

[0042] In the figure:

[0043] 1. fin unit; 11. groove; 12. first transition surface; 13. second transition surface;

[0044] 2. Mounting unit; 21. Base; 211. Mounting groove; 22. Limiting block; 23. Mounting block; 231. Filling groove; 232. Sliding groove; 24. Adjusting plate; 241. Sliding part; 242. Connecting part; 25. Elastic member; 3. Rotor main shaft. DETAILED DESCRIPTION

[0045] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0046] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention.

[0047] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0048] Please also read Figures 1 to 7 , the vortex generator and axial flow fan provided by the present invention are now described.

[0049] Embodiment 1

[0050] The present invention provides a vortex generator, which includes two fin units 1, which extend in an oblique direction to the airflow direction and are away from each other. A groove 11 is provided on the top of each fin unit 1, and the groove 11 passes through the front and rear sides of the fin unit 1 along the extension direction of the fin unit 1; first transition surfaces 12 are provided on the opposite sides of the two fin units 1, and the first transition surfaces 12 extend from the opposite sides to the groove 11; second transition surfaces 13 are provided on the opposite sides of the two fin units 1, and the second transition surfaces 13 extend from the opposite sides to the groove 11; wherein the bottom of the fin unit 1 is used to be fixed on the rotor main shaft 3, and the groove 11 is recessed radially toward the rotor main shaft 3.

[0051] It should be noted that the fin unit 1 extends upward from the outer surface of the rotor main shaft 3 along its radial direction, and is aligned nearly vertically with the outer surface of the rotor main shaft 3, thereby achieving the function of optimizing the flow field.

[0052] It should be understood that when the airflow flows through the fin unit 1, multiple groups of high-energy vortices can be generated. These vortices help to reduce the vortex loss at the root of the blade and enhance the adhesion of the airflow to the blade surface, thereby improving the aerodynamic performance.

[0053] It should be understood that the two fin units 1 extend in an axial direction inclined to the airflow direction and move away from each other, wherein the airflow direction refers to the direction in which the main airflow in the axial flow fan flows. Since the airflow direction is consistent with the axial direction of the rotor main shaft 3, the fin unit 1 extends in an axial direction inclined to the rotor main shaft 3.

[0054] See also Figure 2 and Figure 3 The design of the two fin units 1 has a certain degree of symmetry, and is arranged in a mirror-symmetrical manner relative to the longitudinal axes of the two fin units 1. This symmetrical arrangement helps to balance the vortex distribution in the flow field and further enhance the flow control effect.

[0055] Optionally, the vortex generator provided in the present application may be made of a relatively hard and non-bending material, such as a metal material.

[0056] Compared with the prior art, the vortex generator provided in the embodiment of the present application has the following effects:

[0057] 1) The groove 11, the first transition surface 12 and the second transition surface 13 on the fin unit 1 in the present application are used to form a stable vortex field to enhance airflow attachment and improve aerodynamic performance.

[0058] 2) By making the two groups of fin units 1 extend in an inclined direction to the airflow direction and arranged away from each other, the eddy flow field formed on the blade surface is more uniform, thereby promoting the airflow attachment at the leading edge and the trailing edge of the blade, thereby increasing the lift of the blade and delaying the occurrence of flow separation problems;

[0059] 3) By installing the vortex generator on the rotor main shaft 3, on the one hand, the adverse effects of installing it at the blade root on the blade strength and airflow strength are avoided; on the other hand, the convenience of installation is improved, the installation and repair costs are reduced, and the operation is simple; and the disturbed vortex formed by the vortex generator installed on the rotor main shaft 3 has a significant improvement in delaying the flow separation problem, has a good flow field disturbance effect, and can effectively improve the aerodynamic performance.

[0060] See also Figure 2 and Figure 3 In some possible embodiments, the inclination angle of the fin unit 1 along the air flow direction is 10°-35°.

[0061] It should be understood that by rationally planning the inclination angle of the fin unit 1 along the airflow direction, the disturbance effect of the eddy current field can be effectively improved.

[0062] Specifically, the extension direction of the fin unit 1 is inclined to the airflow direction, and a specific inclination angle is formed between the extension direction of the fin unit 1 and the airflow direction, and the relative angle between the two fin units 1 is controlled between 20° and 70°. The fin unit 1 is extended to a predetermined length along its extension direction to achieve the desired flow field disturbance effect. The inclination angle of the fin unit 1 is precisely controlled to adapt to different flow characteristics. Optionally, the angle of the fin unit 1 relative to the surface of the rotor main shaft 3 can be appropriately changed to strengthen or weaken its influence on the flow.

[0063] See also Figure 1 In some embodiments, the length of the fin unit 1 is 3 cm-7 cm, the width is 1.5 cm-3.5 cm, and the radial height of the fin unit 1 along the rotor main shaft 3 is 30%-70% of the length of the fin unit 1 .

[0064] It should be understood that the disturbance effect of the eddy current field can be effectively improved by reasonably designing the extension length and width of the fin unit 1 along the airflow direction.

[0065] Optionally, the radial height of the fin unit 1 along the rotor main shaft 3 may be slightly higher than the thickness of the boundary layer to promote the adhesion of the boundary layer. In view of the fact that the extension direction of the fin unit 1 is inclined to the airflow direction, the fin unit 1 may optionally maintain a consistent height in its extension direction, or according to the principles of fluid dynamics, the height of the fin unit 1 in its extension direction may gradually change along the axis of the rotor main shaft 3 to achieve a better flow control effect.

[0066] It should be noted that the length direction of the fin unit 1 referred to in the present application is the extension direction of the fin unit 1, that is, the axial direction of the groove 11; the width direction referred to in the present application is the spacing direction between the first transition surface 12 and the second transition surface 13.

[0067] See also Figure 1 Exemplarily, the groove 11 is an arc groove, the first transition surface 12 and the second transition surface 13 are arc structures with equal radius, and the radius of the arc structure is not less than twice the radius of the arc groove.

[0068] Specifically, the arc radius of the groove 11 is L, and the arc radius of the first transition surface 12 and the second transition surface 13 is 2L. The arc design can improve the adhesion of the airflow on the surface of the vortex generator and reduce the separation of the airflow, especially under high angle of attack conditions. When the fluid flows through the arc shape, a lateral force will be generated at the arc, which helps the airflow to form a rotating airflow around the fin unit 1, thereby enhancing the vortex.

[0069] See also Figure 4 In some embodiments, a plurality of grooves 11 are provided, and the plurality of grooves 11 are distributed at intervals along the circumference of the rotor main shaft 3 .

[0070] Specifically, there are two grooves 11, and the two grooves 11 form a double crescent shape on the fin unit 1. This design transforms a single concave curve into a double concave curve, so that the fin unit 1 can adjust the intensity and frequency of the generated vortex. This adjustment capability enables the vortex generator to adapt to a variety of wind speed conditions, realize active flow control of the axial flow fan blades, and optimize the aerodynamic performance.

[0071] Optionally, the number of the grooves 11 can be selected according to actual needs.

[0072] Furthermore, an arc-shaped transition surface is provided between two adjacent grooves 11. By providing an arc-shaped transition surface between two adjacent grooves 11, a lateral force is generated at the arc-shaped transition surface, which facilitates the airflow to form a rotating airflow around the fin unit 1, thereby enhancing the vortex.

[0073] Optionally, the fin unit 1 and the rotor main shaft 3 are fixed by welding.

[0074] Embodiment 2

[0075] See also Figures 5 to 7 The present invention provides a vortex generator, which includes two fin units 1. A mounting unit 2 is correspondingly provided at the bottom of each fin unit 1. The fin unit 1 is fixed to the outer surface of a rotor main shaft 3 through the mounting unit 2; and a foam adhesive is filled between the mounting unit 2 and the outer surface of the rotor main shaft 3 and the fin unit 1.

[0076] The two fin units 1 extend in an oblique direction to the airflow direction and are away from each other. A groove 11 is provided at the top of each fin unit 1, and the groove 11 passes through the front and rear sides of the fin unit 1 along the extension direction of the fin unit 1; the opposite sides of the two fin units 1 are respectively provided with a first transition surface 12, and the first transition surface 12 extends from the opposite side to the groove 11; the opposite sides of the two fin units 1 are respectively provided with a second transition surface 13, and the second transition surface 13 extends from the opposite side to the groove 11; and the groove 11 is concave in the radial direction of the rotor main shaft 3.

[0077] The inclination angle of the fin unit 1 along the airflow direction is 10°-35°.

[0078] The length of the fin unit 1 is 3 cm-7 cm, the width is 1.5 cm-3.5 cm, and the radial height of the fin unit 1 along the rotor main shaft 3 is 30%-70% of the length of the fin unit 1 .

[0079] The groove 11 is an arc groove, and the first transition surface 12 and the second transition surface 13 are arc structures with equal radius, and the radius of the arc structure is not less than twice the radius of the arc groove.

[0080] A plurality of grooves 11 are provided, and the plurality of grooves 11 are distributed at intervals along the circumferential direction of the rotor main shaft 3 .

[0081] The design of the two fin units 1 has a certain degree of symmetry, and is arranged in a mirror-symmetrical manner with respect to the longitudinal axes of the two fin units 1. This symmetrical arrangement helps to balance the vortex distribution in the flow field and further enhance the flow control effect.

[0082] By providing the mounting unit 2 in the embodiment of the present application, the mounting adaptability and connection strength between the fin unit 1 and the rotor main shaft 3 are improved.

[0083] Optionally, the fin unit 1 is fixed on the mounting unit 2, and the mounting unit 2 is fixed to the rotor main shaft 3 by a foam adhesive. Specifically, the foam adhesive has a certain elasticity, which allows the fin unit 1 to finely adjust the inclination angle between the fin unit 1 and the airflow direction according to the change in the flow rate of the airflow, thereby optimizing the control effect.

[0084] See also Figure 5 Exemplarily, the mounting unit 2 includes a limit block 22 and a base 21; the limit block 22 is arranged at the bottom of the fin unit 1; the limit block 22 is a first trapezoidal structure, and the short side of the first trapezoidal structure is connected to the fin unit 1; the top of the base 21 is provided with a mounting groove 211 adapted to the limit block 22, and the bottom is an arc surface adapted to the outer peripheral surface of the rotor main shaft 3, and the arc surface is fixedly connected to the outer peripheral surface of the rotor main shaft 3.

[0085] The base 21 is provided so that the fin unit 1 can be mounted on the outer peripheral surface of the rotor main shaft 3 with the aid of the base 21 ; specifically, the limiting block 22 is limited in the corresponding mounting groove 211 to achieve the connection between the base 21 and the fin unit 1 .

[0086] Furthermore, the area on the outer circumferential surface of the rotor main shaft 3 for installing the base 21 has a slight curvature. Therefore, by reasonably setting the bottom of the base 21 as an arc-shaped surface, the installation adaptability of the base 21 and the rotor main shaft 3 is better, thereby improving the connection strength between the base 21 and the rotor main shaft 3.

[0087] See also Figure 6 In some embodiments, the mounting unit 2 includes a mounting block 23 and two groups of adjustment plates 24; the cross-section of the mounting block 23 is a second trapezoidal structure, the short side of the second trapezoidal structure is connected to the fin unit 1, and the long side of the second trapezoidal structure is provided with a filling groove 231 recessed toward the short side, and a group of sliding grooves 232 are respectively provided on both sides of the filling groove 231; the two groups of adjustment plates 24 correspond to the two groups of sliding grooves 232 one by one and are slidably connected, one end of the adjustment plate 24 is connected to the bottom of the corresponding sliding groove 232 through an elastic member 25, and the other end is fixed to the rotor main shaft 3; wherein, when the mounting unit 2 is fixed to the outer surface of the rotor main shaft 3, the sliding groove 232 and the filling groove 231 are both filled with foam adhesive.

[0088] It should be understood that when the mounting unit 2 is mounted on the outer surface of the rotor main shaft 3, the outer peripheral surface of the rotor main shaft 3 has a certain curvature, and because there is an inclination angle between the extension direction of the fin unit 1 and the axial direction of the rotor main shaft 3, the mounting area of ​​the mounting unit 2 is not an arc-shaped surface with a uniform curvature. In the present application, two sets of adjustment plates 24 are provided at the bottom of the mounting block 23 to adjust the connection position between the mounting unit 2 and the outer peripheral surface of the rotor main shaft 3 within a small range. Specifically, the extension length of the adjustment plate 24 can be adjusted to adapt to different curvature structures at the mounting area, and then adapt to rotor main shafts 3 with different shaft diameters, thereby improving the adaptability of the vortex generator provided in the present application.

[0089] Specifically, the extension length of the adjustment plate 24 extending out of the sliding groove 232 can be adjusted by adjusting the extension length of the elastic member 25. It should be understood that after the extension length of the adjustment plate 24 is determined, a foam adhesive can be filled in the sliding groove 232 to fix the position of the adjustment plate 24, so as to avoid a large-scale change in the position of the adjustment plate 24, which would affect the fixation of the vortex generator.

[0090] Furthermore, the provision of the elastic member 25 and the foam adhesive having a certain elastic modulus filled in the filling slot 231 allow the fin unit 1 to finely adjust the inclination angle between the fin unit 1 and the airflow direction according to the change in the flow rate of the airflow, thereby optimizing the control effect.

[0091] See also Figure 7 Exemplarily, the adjustment plate 24 includes a sliding portion 241 and a connecting portion 242; one end of the sliding portion 241 is fixed to the elastic member 25, and the other end extends out of the sliding groove 232; the connecting portion 242 is fixed to the extended end of the sliding portion 241 and is limited outside the sliding groove 232; the side of the connecting portion 242 away from the sliding groove 232 is an arc-shaped surface adapted to the outer peripheral surface of the rotor main shaft 3.

[0092] The sliding portion 241 is provided to realize the telescopic sliding of the adjustment plate 24 , and the connecting portion 242 is provided to limit the bottom of the adjustment plate 24 at the notch of the sliding groove 232 , so as to prevent the adjustment plate 24 from excessively squeezing the elastic member 25 and affecting the connection strength between the mounting unit 2 and the rotor main shaft 3 .

[0093] Embodiment 3

[0094] In addition, an embodiment of the present invention also provides an axial flow fan, which includes a rotor main shaft 3, multiple groups of blades and multiple groups of vortex generators provided by the above-mentioned embodiment one or embodiment two; the multiple groups of blades are arranged at circumferential intervals along the rotor main shaft 3; the multiple groups of vortex generators are arranged at circumferential intervals along the rotor main shaft 3; wherein the vortex generators are all located on the front side of the blades along the airflow direction and close to the bottom of the blades.

[0095] Optionally, the fin unit 1 can be formed by cutting a flat plate material, and the processing technology is simple.

[0096] It should be understood that when the axial flow fan is inlet, at the trailing edge or bottom of the blade, the flow may separate from the blade surface to form a separation vortex. The separation vortex may reduce the flow efficiency and increase the instability of the flow. The vortex generator provided in the present application can enhance the adhesion of the fluid to the blade surface by increasing the turbulence on the blade surface and reduce the possibility of flow separation. By reducing the vortex intensity and pressure fluctuations at the root of the blade, the corrosion and wear caused by the vortex are slowed down.

[0097] The axial flow fan provided in the present application has all the beneficial effects of the vortex generators provided in the above-mentioned embodiment one or embodiment two because it adopts multiple groups of vortex generators provided in the above-mentioned embodiment one or embodiment two, and can effectively promote the airflow attachment at the leading edge and trailing edge of the blade, thereby increasing the lift of the blade and delaying the occurrence of flow separation problems. Therefore, the axial flow fan has better aerodynamic performance; and its vortex generator has better installation performance.

[0098] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vortex generator, characterized in that: It comprises two fin units, the two fin units extend in a direction oblique to the airflow direction and are away from each other; A groove is provided on the top of each fin unit, and the groove passes through the front and rear sides of the fin unit along the extension direction of the fin unit; The opposite sides of the two fin units are respectively provided with a first transition surface, and the first transition surface extends from the opposite sides to the groove; the opposite sides of the two fin units are respectively provided with a second transition surface, and the second transition surface extends from the opposite sides to the groove; Wherein, the bottom of the fin unit is used to be fixed on the rotor main shaft, and the groove is recessed along the radial direction of the rotor main shaft.

2. The vortex generator according to claim 1, characterized in that The inclination angle of the fin unit along the air flow direction is 10°-35°.

3. The vortex generator according to claim 1, characterized in that The length of the fin unit is 3 cm-7 cm, the width is 1.5 cm-3.5 cm, and the radial height of the fin unit along the rotor main shaft is 30%-70% of the length of the fin unit.

4. The vortex generator according to claim 1, characterized in that The groove is an arc-shaped groove, the first transition surface and the second transition surface are arc-shaped structures with equal radius, and the radius of the arc-shaped structure is not less than twice the radius of the arc-shaped groove.

5. The vortex generator according to claim 1, characterized in that There are a plurality of grooves, and the plurality of grooves are distributed at intervals along the circumference of the rotor main shaft.

6. The vortex generator according to claim 1, characterized in that A mounting unit is correspondingly provided at the bottom of each fin unit, and the fin unit is fixed to the outer surface of the rotor main shaft through the mounting unit; and foam adhesive is filled between the mounting unit, the outer surface of the rotor main shaft and the fin unit.

7. The vortex generator according to claim 6, characterized in that The installation unit comprises: A limit block is arranged at the bottom of the fin unit; the limit block is in a first trapezoidal structure, and the short side of the first trapezoidal structure is connected to the fin unit; The base has a mounting groove matched with the limit block on the top, and a curved surface matched with the outer peripheral surface of the rotor main shaft on the bottom, and the curved surface is fixedly connected to the outer peripheral surface of the rotor main shaft.

8. The vortex generator according to claim 6, characterized in that The installation unit comprises: A mounting block, the cross section of which is a second trapezoidal structure, the short side of the second trapezoidal structure is connected to the fin unit, the long side of the second trapezoidal structure is provided with a filling groove recessed toward the short side, and a group of sliding grooves are respectively provided on both sides of the filling groove; Two groups of adjustment plates, corresponding to the two groups of sliding grooves one by one and slidably connected, one end of the adjustment plate is connected to the groove bottom of the corresponding sliding groove through an elastic member, and the other end is fixed to the rotor main shaft; Wherein, when the mounting unit is fixed to the outer surface of the rotor main shaft, the sliding groove and the filling groove are both filled with foam adhesive.

9. The vortex generator according to claim 8, characterized in that The adjustment plate comprises: A sliding portion, one end of which is fixed to the elastic member and the other end of which extends out of the sliding groove; The connecting portion is fixed to the extended end of the sliding portion and is limited outside the sliding groove; the side of the connecting portion away from the sliding groove is an arc-shaped surface adapted to the outer peripheral surface of the rotor main shaft.

10. Axial flow fan, characterized in that: include: Rotor main shaft; A plurality of groups of blades are arranged at intervals along the circumference of the rotor main shaft; as well as A plurality of groups of vortex generators according to any one of claims 1 to 9, wherein the plurality of groups of vortex generators are arranged at intervals along the circumference of the rotor main shaft; Wherein, the vortex generators are all located on the front side of the blade along the airflow direction and close to the bottom of the blade.

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