CN207004919U - Axial flow blower 3 d impeller with leaf vein texture and splitterr vanes - Google Patents

Abstract

The utility model discloses a kind of axial flow blower 3 d impeller with leaf vein texture and splitterr vanes, including wheel hub, axle sleeve to be fixed on wheel hub with connector；Also include the twisted blade and splitterr vanes being fixedly connected on wheel hub；It is suction surface and pressure face that the twisted blade, which includes,；Aerofoil profile groove is provided with the top of the twisted blade；The first half of the twisted blade pressure face is provided with vein shape groove, and aerofoil profile groove is communicated by gas outlet with vein shape groove；The twisted blade suction surface afterbody is provided with winglet projection；Parabola aperture is provided with the twisted blade；Splitterr vanes are set between two neighboring twisted blade；The height of the splitterr vanes is less than the height of twisted blade half.The impeller is used on axial flow blower, secondary flow phenomenon can be reduced, prevents boundary layer separation, suppresses the generation of blade wake passing whirlpool, reduces turbulent dissipation and flow losses.

Description

Three-dimensional impeller for axial fans with vein-like structure and splitter blades

technical field

The utility model relates to the field of axial flow fan design, in particular to a novel three-element impeller of an axial flow fan with a vein-shaped structure and splitter blades.

Background technique

The working principle of the axial flow fan is to use the mechanical energy input by the motor to increase the pressure of the gas to transport and discharge the gas. Axial flow fans play a role in various fields of the national economy, widely used in factories, mines, vehicles, boats and buildings, etc., and play an irreplaceable role in ventilation, dust removal and cooling. According to incomplete statistics, all countries in the country The annual power consumption of wind turbines accounts for 20% of the country's power generation. Many of the wind turbines are either old or low in efficiency, resulting in a serious waste of electricity. It can be seen that improving the performance of wind turbines to achieve energy conservation is important in the national economy. Axial flow fans are usually used in occasions with high flow requirements and low pressure. The structure is relatively simple and easy to install, and it plays an irreplaceable role in the field of fans.

Although the structure of the axial flow fan is simple, the flow situation is indeed quite complicated. The flow is often three-dimensional, viscous and unsteady, and it is rarely or difficult to fully consider these situations in the past fan design. Even with the mature numerical analysis, it is difficult to control the influence of the above factors on the fan, especially the fluid The key factor is viscosity, because the viscosity often causes the blade wake vortex to form at the blade outlet; due to the viscosity, there will be a viscous boundary layer on the blade surface (especially when the blade surface is very smooth), and there will be a strong interaction between the blade surface and the mainstream. Effect, resulting in secondary flow phenomenon; the existence of viscosity will also form aerodynamic noise, mainly including rotational noise and eddy current noise. In addition, the pressure difference between the pressure surface and the suction surface of the blade, the radial clearance between the top of the blade and the casing, and the secondary flow generated by the radial flow in the boundary layer of the blade itself are also the main sources of increased fan losses and reduced efficiency.

In summary, only by controlling and reducing the secondary flow phenomenon, preventing boundary layer separation, suppressing the generation of blade wake vortices, and reducing turbulent dissipation and flow loss can an axial flow fan with high efficiency, good performance, low noise and energy saving be designed , to meet the needs of modern production for fans.

Utility model content

The problem to be solved by this utility model is to propose a new type of axial flow fan with a vein-shaped structure and splitter blades by controlling and reducing the generation of secondary flow, boundary layer separation, wake vortex and eddy current noise in view of the deficiencies of the prior art. Element impeller. The utility model can reduce secondary flow phenomenon, prevent boundary layer separation, suppress blade wake vortex generation, reduce turbulent flow dissipation and flow loss, and has the characteristics of high efficiency, good performance, low noise and energy saving.

In order to solve the above-mentioned technical problems, the utility model provides a three-dimensional impeller of an axial flow fan with a vein-shaped structure and splitter blades, including a hub, and the shaft sleeve is fixed on the hub with connecting pieces; it also includes curved and twisted blades fixedly connected to the hub and splitter blades;

The twisted blade includes a suction surface and a pressure surface; the top of the twisted blade is provided with an airfoil groove; the upper half of the pressure surface of the curved blade is provided with a vein-shaped groove, and the airfoil groove passes through the air outlet and The vein-shaped grooves communicate with each other; the tail of the suction surface of the twisted blade is provided with a small wing protrusion; the curved blade is provided with a parabolic small hole;

A splitter vane is arranged between two adjacent twisted vanes; the height of the splitter vane is less than half of the height of the twisted vane.

As an improvement of the ternary impeller of the axial flow fan with vein-like structure and splitter blades of the present invention: the splitter blades are arranged in the middle of adjacent curved and twisted blades.

As a further improvement of the ternary impeller of the axial flow fan with vein-shaped structure and splitter blades of the present invention: the structures of the two sides of the splitter blades are the same, respectively: at least two radially equidistant groove groups, each groove group includes at least two circular grooves, the line connecting the centerlines of the circular grooves of each groove group is perpendicular to the outer surface of the hub, and the axis line of the circular grooves is perpendicular to the splitter blade.

As a further improvement of the ternary impeller of the axial flow fan with vein-shaped structure and splitter blades of the present invention: the vein-shaped groove includes at least two veins, and each vein communicates with an air outlet, and the air outlet is connected to the wing. The grooves are connected.

As a further improvement of the ternary impeller of the axial flow fan with vein-shaped structure and splitter blades of the present invention: the rear end of the suction surface of the curved and twisted blades is equidistantly provided with three winglet protrusions.

As a further improvement of the ternary impeller of the axial flow fan with vein-like structure and splitter blades of the present invention: eight curved and twisted blades and eight splitter blades are equidistantly arranged on the hub.

As a further improvement of the ternary impeller of the axial flow fan with vein-like structure and splitter blades of the present invention: the twisted blades are twisted by 15°-20° and bent by 15°-20°.

As a further improvement of the ternary impeller of the axial flow fan with vein-like structure and splitter blades of the present invention: the height of the splitter blades is 30%-40% of the height of the curved and twisted blades.

The utility model has the following advantages: the utility model adopts the curved and twisted blade to make the installation angle of the root of the blade large, and the installation angle of the top of the curved and twisted blade is small, so as to ensure that the air has a relatively uniform axial velocity at each position in the radial direction, ensuring normal Work, avoid air separation, reduce flow loss and can effectively suppress the secondary flow inside the cascade (static pressure is C-shaped distribution blade suction surface and pressure surface pressure difference is smaller than conventional blades), and can increase the degree of root reaction and reduce the top reaction degree, to achieve the purpose of equalizing the distribution of reaction degree along the height of the blade, and to improve the flow capacity of the root; there is a vein-shaped groove on the top of the pressure surface of the curved-twisted blade, and there is an airfoil groove on the top of the curved-twisted blade, and the airfoil groove and vein-shaped The grooves are connected by air outlets. This structure can form a low-speed secondary vortex in the vein-shaped grooves. The viscous resistance in the groove is opposite to the total resistance to reduce viscous resistance, suppress turbulence intensity, and reduce turbulence dissipation. The high-energy gas is introduced into the airfoil groove on the top of the blade through the vein-shaped groove and the air outlet hole, preventing some gas from flowing from the pressure surface to the suction surface through the radial gap, causing chaos in the flow near the top of the twisted blade, and improving the flow at the top of the twisted blade , can also avoid the lateral secondary flow phenomenon caused by the gas flowing from the pressure surface of the twisted blade to the adjacent suction surface, thereby reducing the flow loss, and the vein-shaped grooves also have the effect of ordinary grooves; the parabola on the twisted blade The small holes can reduce the pressure difference between the suction surface and the pressure surface of the blade, improve the separation of the boundary layer around the blade, and reduce the generation of eddy noise; Control the radial flow, reduce the secondary flow of radial movement, prevent the wake jet, and make the separation point of the boundary layer on the suction surface of the curved and twisted blade move backward to reduce energy loss; the splitter blade can effectively break the vortex and make the flow in the flow channel It is more stable and reduces unstable phenomena such as flow separation and secondary flow. In addition, the circular grooves on the splitter blades can reduce wall friction resistance, flow resistance, and flow loss. Relying on the principle to improve the different positions of the impeller of the axial flow fan, the efficiency of the axial flow fan is higher, the performance is better, and it is more energy-saving and environmentally friendly.

Description of drawings

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

Fig. 1 is the overall structure schematic diagram of the novel axial flow fan ternary impeller of the utility model band leaf vein structure and splitter blade;

Fig. 2 is a structural schematic diagram of the suction surface of the curved and twisted blade in Fig. 1;

Fig. 3 is a structural schematic diagram of the pressure surface of the curved and twisted blade in Fig. 1;

Fig. 4 is the structural representation of splitter vane in Fig. 1;

Fig. 5 is a schematic structural view of the B-B surface of the splitter blade in Fig. 4;

Fig. 6 is a structural schematic diagram of the C-C surface of the twisted blade and the winglet protrusion in Fig. 2;

Fig. 7 is a structural schematic diagram of the circular groove of the splitter blade in Fig. 1;

Fig. 8 is a schematic structural view of the airfoil groove in Fig. 1;

Fig. 9 is a schematic diagram of the cascade structure of the curved and twisted blades in Fig. 1;

FIG. 10 is a schematic diagram of the bent and twisted structure of the twisted blade 1 in FIG. 1 .

detailed description

The utility model is further described below in conjunction with specific embodiments, but the protection scope of the utility model is not limited thereto.

Embodiment 1. A new three-dimensional impeller for an axial flow fan with a vein-like structure and splitter blades, as shown in the figure, includes a hub, a curved and twisted blade 1 fixedly connected to the hub, splitter blades 2, a shaft sleeve 3 and a connecting piece 4 .

The curved and twisted blade 1 includes a suction surface 18 and a pressure surface 19. The top of the suction surface 18 of the curved and twisted blade 1 is provided with a vein-shaped groove 15, and the rear end of the curved and twisted blade 1 is provided with a winglet protrusion 13. The vein-shaped groove 15 includes at least Two veins, the installation angle at the root of the twisted blade 1 is large, and the installation angle at the top is small (the installation angle is the angle between the rotation plane at the radius r of the curved blade 1 and the chord length of the airfoil, determined by β1 and β2), to ensure that the air has a relatively uniform axial velocity at each position in the radial direction, to ensure normal operation, avoid air separation, reduce flow loss and effectively suppress the secondary flow inside the cascade (the static pressure is C-shaped distribution , so that the pressure difference between the suction surface 18 and the pressure surface 19 of the blade is smaller than that of a conventional blade), and at the same time, the degree of reaction at the root of the curved and twisted blade 1 can be increased, and the degree of reaction at the top of the curved and twisted blade 1 can be reduced, so as to achieve the purpose of homogenizing the distribution of the degree of reaction along the blade height. The flow capacity of the root of the curved and twisted blade 1 is improved. The cascade refers to the plane that cuts off the blade with its axis cylindrical surface on a certain radius r, and then develops this section to reflect the positional relationship of the adjacent curved blades 1, the installation angle of the curved blades 1, etc.

The winglet protrusions 13 are set on the suction surface 18 to enable the fluid to flow in the cascade. Due to the interaction between the twisted blade 1 and the fluid, the pressure on the pressure surface 19 of the blade is greater than that on the suction surface 18, and the fluid flows from the pressure surface 19 of the twisted blade 1 to the suction force. The flow on the surface 18, and the airflow on the suction surface 18 caused by the incoming flow is more turbulent, so the empennage is designed to make the airflow move along the chord direction, control the radial flow, and simultaneously control the size of the channel vortex in the channel of the curved blade 1 and the surface of the blade The boundary layer creeping flow controls the secondary flow of radial movement, reduces the uneven velocity, prevents the wake jet, and makes the separation point of the suction surface 18 of the twisted blade 1 move backward to reduce energy loss.

The top of the twisted blade 1 is provided with an airfoil groove 11, and the airfoil groove 11 communicates with the vein-shaped groove 15 on the top of the suction surface 18 of the twisted blade 1 through several air outlets 14. This structure can form a low-speed The secondary vortex, the internal viscous resistance in the vein-shaped groove 15 is opposite to the total resistance to reduce the viscous resistance, suppress the turbulent flow intensity, reduce the turbulent flow dissipation, and guide the high-energy gas on the upper part of the pressure surface 19 of the twisted blade 1 through the vein-shaped groove 15 and the air outlet 14 into the blade top airfoil groove 11 to prevent some gas from flowing from the pressure surface 19 to the suction surface 18 through the radial gap, causing chaos in the flow near the top of the curved and twisted blade 1, improving the flow at the top of the curved and twisted blade 1, and also It can avoid the lateral secondary flow phenomenon caused by the gas flowing from the pressure surface 19 of the twisted blade 1 to the adjacent suction surface 18, thereby reducing the flow loss. At the same time, the airfoil groove 11 on the top of the twisted blade 1 also has the function of a common groove , can form the vortex pad effect and reduce the turbulence intensity near the wall. The curved and twisted blade 1 is provided with a parabolic small hole 12, which can reduce the pressure difference between the suction surface 18 and the pressure surface 19 of the curved and twisted blade 1, improve the boundary layer separation around the curved and twisted blade 1, and reduce the generation of eddy current noise; The winglet protrusion 13 at the rear end of the twisted blade 1 can guide the airflow to move along the chord direction, which can well control the radial flow, reduce the secondary flow of the radial movement, prevent the wake jet, and make the suction surface 18 of the twisted blade 1 The boundary layer separation point moves backwards to reduce energy loss. The splitter vanes 2 are kudzu wings, which are arranged in the middle of two adjacent twisted vanes 1, and the two sides are provided with radially equidistant groove groups, and each groove group contains more than two circular grooves 23 , the circular grooves 23 are arranged on the same straight line, the center line of the circular grooves 23 of each groove group is perpendicular to the outer surface of the hub, and the axis of the circular grooves 23 is perpendicular to the splitter blade 2 . The splitter vane 2 can effectively break the vortex, make the flow in the flow channel more stable, and reduce instability phenomena such as flow separation and secondary flow. In addition, the circular groove 23 on the curved and twisted vane 1 can reduce wall friction resistance and flow resistance. Reduce flow loss. The height of the splitter vane 2 is less than that of the curved and twisted vane 1, and the shaft sleeve 3 is fixed on the hub with a standard connecting piece 4. Splitter vane 2 is in order to block the flow and vortex breaking etc. from the pressure surface 19 of the twisted blade 1 to the blade suction side 18 in the root part of the twisted blade 1 in order to block it.

Referring to the working principle of the blade, the twisting of the curved and twisted blade 1 can ensure that the air has a relatively uniform axial velocity at all positions in the radial direction, ensure normal work, avoid air separation, and reduce flow loss. The boundary layer migration theory proposed based on the static blowing experiments and numerical calculation results of the blade annular cascade, that is, after the twisted blade 1 is bent in the circumferential direction, the radial component of the force between the surface of the twisted blade 1 and the airflow is not equal to zero, Thus, the distribution of pressure along the height of the curved blade 1 is controlled. After the curved blade 1 is bent in the circumferential direction, the radial component of the force between the surface of the curved blade 1 and the airflow is not equal to zero, thereby controlling the pressure along the curved blade 1. The distribution of the height makes the pressure distribution with high pressure at both ends and low pressure in the middle formed on the surface of the curved and twisted blade 1, especially the suction surface 18, that is, the "C" type pressure distribution. The layer is sucked to the middle and taken away by the main flow, which reduces the accumulation of low-energy fluid at the corner formed by the two end walls and the suction surface 18, avoids the occurrence of separation, and thus reduces the flow loss at both ends, followed by bending The pressure difference between the pressure surface 19 and the suction surface 18 of the twisted blade 1 is obviously smaller than that of the conventional blade, the lateral secondary flow on the end wall is weakened, and the corresponding lateral secondary flow loss is reduced. Excellent performance, can improve the degree of stage reaction and increase the flow capacity of the stage, delay the channel vortex formation time and reduce the size and strength of the channel vortex, the twisted blade 1 is twisted by 15° in the design

-20°, bending 15°-20°, at the same time, in order to more effectively reduce the secondary flow, suppress the thickness of the boundary layer, control the formation of the wake tip vortex, and reduce the dissipation of turbulence, the vein-shaped groove 15 and the airfoil groove 11 are designed. , Parabolic small hole 12 and winglet protrusion 13 etc.

The utility model firstly designs the blades on the hub to be bent and twisted to ensure that the air flow has a relatively uniform axial velocity at each position in the radial direction, so as to ensure normal operation, avoid air separation, reduce flow loss and effectively suppress the airflow inside the cascade. Radial and transverse secondary flows can simultaneously increase the degree of reaction at the root, reduce the degree of reaction at the top, achieve the purpose of equalizing the distribution of the degree of reaction along the height of the blade, improve the flow capacity of the root, delay the formation time of the channel vortex and reduce the channel vortex. The size and strength of the twisted blade 1; the vein-shaped groove 15 on the upper half of the pressure surface 19 of the twisted blade 1 is connected to the airfoil groove 11 on the top of the twisted blade 1 through the air outlet 14, and this structure can be in the vein-shaped groove 15 A low-speed secondary vortex is formed, and the viscous resistance in the groove is opposite to the total resistance to reduce viscous resistance, suppress turbulence intensity, and reduce turbulent dissipation. The top airfoil groove 11 prevents some gas from flowing from the pressure surface 19 to the suction surface 18 through the radial gap, causing chaos in the flow near the top of the twisted blade 1, improving the flow of the blade tip, and also avoiding the flow of gas from the twisted blade 1 The lateral secondary flow phenomenon generated by the pressure surface 19 flowing to the adjacent suction surface 18 can reduce the flow loss. At the same time, the vein-shaped groove 15 on the top of the curved and twisted blade 1 also has the function of a common groove, which can form a vortex pad effect, so that The turbulence intensity in the near-wall area is reduced; the parabolic small hole 12 on the twisted blade 1 can reduce the pressure difference between the suction surface 18 and the pressure surface 19, improve the boundary layer separation around the twisted blade 1, and reduce the generation of eddy current noise; the empennage can guide The airflow moves along the chord direction, which can well control the radial flow, reduce the secondary flow of the radial movement, prevent the wake jet, and make the separation point of the suction surface 18 of the twisted blade 1 move backward to reduce energy loss The splitter vane 2 can effectively break the vortex, making the flow in the flow channel more stable, reducing instability phenomena such as flow separation and secondary flow. loss, while suppressing the generation of eddy noise. Relying on the principle to improve the different positions of the impeller of the axial flow fan, the efficiency of the axial flow fan is higher, the performance is better, and it is more energy-saving and environmentally friendly.

Twisted blade 1 is an airfoil blade designed by the isocircular isolated airfoil method. The thickness distribution of curved and twisted blade 1 is the same as that of the NACA four-digit airfoil. The relative thickness of the airfoil is 10%-15%. The number of 1 is 8; the groove depth of the airfoil groove 11 on the top of the curved blade 1 is 1%-2% of the height of the curved blade 1, and the thickness of the airfoil groove 11 is 50%-60 of the top surface of the curved blade 1 %; On the rear end of the twisted blade 1, there are winglet protrusions 13 equidistantly distributed, the spacing d1 of the winglet protrusions 13 is 18%-22% of the height H of the twisted blade 1, and the length d4 of the winglet protrusion 13 is the twisted blade 15%-17% of the chord length, the angle ω with the chord length is 30°-40°, and the distance d5 from the rear edge of the curved blade 1 is 1%-3% of the chord length of the curved blade 1; Distributed in the twisted blade 1 are parabolic small holes 12 with a diameter of 1-2 mm; the depth of the vein-shaped groove 15 on the top of the pressure surface 19 of the twisted blade 1 is 1-2 mm, and the maximum groove length is 30% of the height of the twisted blade 1 -40%, the pitch of the veins is 20-30mm, and each vein is connected to an air outlet 14 independently, and the specific number of veins depends on the size of the twisted blade 1; the twisted blade 1 is twisted by 15°-20° , bend 15°-20°. Bending means that the twisted blade 1 bends along the horizontal mid-section (the surface perpendicular to the height of the twisted blade 1) when it is designed with the equal circulation isolated airfoil method, that is, the airfoil sections at different radii Corresponding spacing; twist means that the twisted blade 1 is twisted along the vertical middle section (the plane parallel to the height of the twisted blade 1) when the twisted blade 1 is designed with the equal circulation isolated airfoil method, that is, the airfoil sections at different radii rotate around The vertical direction is twisted by the corresponding angle. Twisting benefits: not only makes the installation angle of the blade root of the curved and twisted blade 1 large, but the installation angle of the blade tip is small, but also ensures that the air has a relatively uniform axial velocity at all positions in the radial direction, ensuring normal operation and avoiding air separation , to reduce flow loss. Benefits of bending and twisting: it can effectively suppress the secondary flow inside the cascade (the pressure difference between the suction surface 18 and the pressure surface 19 of the curved and twisted blade 1 is smaller than that of a conventional blade), and at the same time, it can increase the degree of root reaction and reduce the top pressure. The degree of reaction can achieve the purpose of homogenizing the distribution of degree of reaction along the height of the blade, improving the flow capacity of the root, delaying the formation time of channel vortex and reducing the size and strength of channel vortex.

The splitter vane 2 is a kudzu wing, and the height of the splitter vane 2 is 30%-40% of the height of the twisted vane 1, and the two sides of the splitter vane 2 are provided with radially equidistant n groove groups (radial means Along the direction of the height of the splitter vane 2), each groove group contains c circular grooves 23, and the minimum distance between the round groove 23 and the top, root, leading edge and rear end of the splitter vane 2 is 6% of the length of the arc-shaped plate -12%, the distance d between adjacent circular grooves 23 is 5-8mm, the radius of the circular grooves 23 is 1-2mm, and the values of n and c depend on the height and width of the splitter vanes 2; the circular grooves 23 are distributed in a straight line , the spacing of different circular grooves 23 is fixed, and the spacing around the distance can also be fixed. Above-mentioned connector 4 is fixed on the wheel hub with axle sleeve 3, and axle sleeve 3 adopts conventional axle sleeve, and connector 4 adopts standard part bolt to be connected with hub by axle sleeve 3.

Experiment 1. The "three-dimensional impeller of a new axial flow fan with leaf vein structure and splitter blades" described in Example 1 was simply verified using CFD technology. Under the boundary conditions of inlet speed 2m/s and rotation speed 100rad/s In the case of consistency, the performance is judged by measuring the static pressure at the outlet, because the axial flow fan mainly converts mechanical energy into the static pressure of the wind. In the case of the same input power, a large static pressure indicates high efficiency, turbulence dissipation and flow The loss is less, that is, the secondary flow, wake vortex, etc. have been effectively controlled.

Comparative Example 1: Cancel the airfoil groove 11 on the top of the twisted blade 1 and the vein-like groove 15 on the top of the suction surface 18 of the twisted blade 1 in Example 1.

Comparative Example 2: Cancel the parabolic small hole 12 in Example 1, the rest is the same as Example 1, and carry out Comparative Example 2.

Comparative example 3: cancel the splitter blade 2 in the embodiment 1, the rest is the same as the embodiment 1, and carry out the comparative example 3.

Comparative Example 4: The twisted blade 1 in Embodiment 1 was replaced with an ordinary straight blade, and the rest was the same as Embodiment 1, and Comparative Example 4 was carried out.

All of the above comparative examples 1-4 were detected as described in Experiment 1, the input power was the same, and the obtained results (reference atmospheric pressure) were respectively:

Condition outlet static pressure experiment one 190.03Pa Comparative example 1 164.11Pa Comparative example 2 183.61Pa Comparative example 3 156.32Pa Comparative example 4 133.22Pa

Under the same conditions, compared with Comparative Examples 1-4, the outlet static pressure of the utility model has been significantly improved, indicating that the turbulence dissipation and flow loss have been significantly reduced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the present utility model has been described in detail with reference to signing the various embodiments, those of ordinary skill in the art should understand : It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the various embodiments of the utility model scope of the program.

Claims (8)

1. The ternary impeller of an axial flow fan with a vein-shaped structure and splitter blades, including a hub, and the bushing (3) is fixed on the hub with a connecting piece (4); it is characterized in that it also includes a bending torsion fixedly connected to the hub Blade (1) and splitter blade (2); The twisted blade (1) includes a suction surface (18) and a pressure surface (19); the top of the twisted blade (1) is provided with an airfoil groove (11); the pressure surface of the twisted blade (1) The upper half of the blade is provided with a vein-shaped groove (15), and the airfoil groove (11) communicates with the vein-shaped groove (15) through the air outlet (14); Wing protrusions (13); parabolic small holes (12) are provided on the twisted blades (1); A splitter vane (2) is arranged between two adjacent twisted vanes (1); the height of the splitter vane (2) is less than half of the height of the twisted vane (1). 2. The ternary impeller of an axial flow fan with vein-like structure and splitter blades according to claim 1, characterized in that: the splitter blades (2) are arranged in the middle of adjacent curved and twisted blades (1). 3. The ternary impeller of the axial flow fan with veined structure and splitter blades according to claim 2, characterized in that: the structures of both sides of the splitter blades (2) are the same, and are respectively: There are at least two radially equidistant groove groups, each groove group includes at least two circular grooves (23), and the center line of the circular grooves (23) of each groove group is perpendicular to the hub On the outer surface, the axis line of the circular groove (23) is perpendicular to the splitter blade (2). 4. The ternary impeller of an axial flow fan with vein-shaped structure and splitter blades according to claim 3, characterized in that: the vein-shaped groove (15) comprises at least two vein grooves, each vein groove and a The air outlet (14) communicates, and the air outlet (14) communicates with the airfoil groove (11). 5. The ternary impeller of an axial flow fan with vein-like structure and splitter blades according to claim 4, characterized in that three small Wing protrusions (13). 6. The ternary impeller of an axial flow fan with veined structure and splitter blades according to claim 5, characterized in that: eight curved and twisted blades (1) and eight splitter blades ( 2). 7. The ternary impeller of an axial flow fan with a vein-like structure and splitter blades according to claim 6, characterized in that: the twisted blade (1) is twisted by 15°-20° and bent by 15°-20° . 8. The ternary impeller of an axial flow fan with veined structure and splitter blades according to claim 7, characterized in that: the height of the splitter blades (2) is 30%- 40%.