CN210484191U - Axial flow fan blade structure capable of reducing blade tip vortex noise - Google Patents
Axial flow fan blade structure capable of reducing blade tip vortex noise Download PDFInfo
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- CN210484191U CN210484191U CN201921563498.7U CN201921563498U CN210484191U CN 210484191 U CN210484191 U CN 210484191U CN 201921563498 U CN201921563498 U CN 201921563498U CN 210484191 U CN210484191 U CN 210484191U
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Abstract
The utility model discloses an axial fan blade structure with reduce apex vortex noise, including wheel hub and blade, the blade is equipped with a plurality of, this blade one end and wheel hub fixed connection, the blade is blade root portion with wheel hub connecting portion, and the other end is the tiptoe portion, its characterized in that the tiptoe portion of blade is equipped with the flap, flap one end and blade fixed connection, the other end are the free end to towards the pressure surface or towards the suction surface. The utility model has the advantages that: the flap is additionally arranged at the tip part of the blade, so that the tip vortex of the blade tip can be effectively weakened or eliminated, the turbulence noise generated by the tip vortex is reduced, the influence of the tip vortex on the wake flow is weakened, the energy loss is reduced, and the working efficiency is improved.
Description
Technical Field
The utility model belongs to the technical field of axial fan technique and specifically relates to an axial fan blade structure suitable for fields such as car, air conditioner, building ventilation, this blade structure has the characteristics that reduce the sharp whirlpool noise of leaf.
Background
The noise generated by the axial flow fan includes aerodynamic noise and mechanical noise, wherein the aerodynamic noise is dominant, the aerodynamic noise mainly includes rotational noise and turbulent noise, and the turbulent noise mainly generates from the blade tip, the blade leading edge and the blade trailing edge. The reduction of the aerodynamic noise of the axial flow fan and the improvement of the efficiency are important contents generally concerned by researchers at home and abroad.
The wing flaps can effectively weaken or eliminate the influence of tip vortexes generated by the airflow pressure difference between the pressure surface and the suction surface of the tip airfoil on the aerodynamic performance of the wings, are already applied to airplane wings, are mostly folded towards the suction surface, are also applied to wind turbine blades in recent years due to similar structures, but are rarely applied to axial flow fan blades in a noise reduction and efficiency enhancement mode.
The tip vortex of the impeller blade top area is the main vortex characteristic of the axial flow fan, and in the process that the tip vortex moves from the previous flow channel to the next flow channel, due to the action of pressure difference, the radial flow and the axial flow of the outward pressure surface are intersected in the blade top area and flow to the suction surface, so that a shearing boundary layer is curled, and the blade tip vortex is formed. The generation, development and crushing of the blade tip vortex are in a periodic and self-maintaining form, and strong periodic unsteady turbulent flow pulsation is caused in a flow passage, so that turbulent flow noise is generated.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides an axial fan blade structure with reduce apex vortex noise increases through blade leaf point portion and puts the flap, especially increases circular arc type or airfoil type flap, with flap or roll over to the suction surface, or roll over to the pressure surface, in order to weaken or eliminate the apex vortex of blade top, play the effect that reduces the turbulent noise that the apex vortex produced, weaken the influence of apex vortex to the wake simultaneously, reduce energy loss, and the work efficiency is improved.
The technical scheme of the utility model is realized like this:
the utility model provides an axial fan blade structure with reduce apex vortex noise, includes wheel hub and blade, the blade is equipped with a plurality of, this blade one end and wheel hub fixed connection, blade and wheel hub connecting portion are blade root portion, and the other end is the tiptoe portion, its characterized in that the tiptoe portion of blade is equipped with the flap, flap one end and blade fixed connection, the other end are the free end to towards the pressure surface or towards the suction surface.
Furthermore, the cross section of the blade is arc-shaped, the cross section of the flap is arc-shaped, the flap is directly formed by bending the tip part of the blade, and the bending direction faces to the pressure surface/suction surface.
Furthermore, the cross section of the blade is of a wing type, the cross section of the flap is of a wing type, the blade tip part of the blade is directly bent and formed, and the bending direction faces to the pressure surface/suction surface.
Furthermore, the cross section of the flap is arc-shaped, one end of the flap is fixedly connected with the tip part of the blade through riveting or welding, and the other end of the flap is a free end and faces to the pressure surface/suction surface.
Furthermore, the cross section of the flap is of an airfoil shape, one end of the flap is fixedly connected with the tip part of the blade through riveting or welding, and the other end of the flap is a free end and faces to a pressure surface/a suction surface.
Further, the angle between the flap and the blade is set to be 90-120 degrees.
Compare with traditional axial fan blade, the beneficial effects of the utility model are that: the flap is additionally arranged at the tip part of the blade, so that the tip vortex of the blade tip can be effectively weakened or eliminated, the turbulence noise generated by the tip vortex is reduced, the influence of the tip vortex on the wake flow is weakened, the energy loss is reduced, and the working efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a sectional view taken along line A-A;
FIG. 4 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 5 is a top view of FIG. 3;
FIG. 6 is a schematic diagram of a third structure according to an embodiment of the present invention;
FIG. 7 is a top view of FIG. 5;
FIG. 8 is a cross-sectional view taken along line A-A of FIG. 6;
fig. 9 is a schematic structural diagram of a fourth embodiment of the present invention;
FIG. 10 is a top view of FIG. 7;
in the figure: 1. Blade, 101, flap, 2, hub.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, 3, 5 and 7, the present invention relates to a blade 1 for an axial flow fan impeller. The axial flow fan impeller consists of a blade 1 and a hub 2, one end of the blade 1 is installed on the hub 2, the other end of the blade is provided with a flap 101, when the axial flow fan impeller hub 2 drives the blade 1 to rotate anticlockwise, the blade 1 applies work to surrounding airflow, so that the airflow pressure of the axial flow fan impeller is increased, the wind speed is increased, and the airflow flows through the blade 1 from front to back to send the airflow out.
As shown in fig. 1 and 2, the first embodiment of the axial flow fan blade of the present invention, the cross section of the blade 1 is an arc, the tip portion of the blade 1 is provided with the flap 101, the flap 101 is formed by bending the tip portion of the blade 1 toward the suction surface, and the bending angle α is set to be 90 °.
When the blade-tip vortex generator works, the impeller hub 2 drives the blade 1 to rotate anticlockwise, the blade 1 applies work to surrounding air flow, high-pressure air flow flowing from a pressure surface of the blade tip portion to a suction surface is blocked by the flap and is not converged with low-pressure air flow of the suction surface or is converged with a small amount of air flow, blade tip vortex is effectively eliminated or weakened, turbulent noise generated by the blade tip vortex is reduced, meanwhile, the influence of the blade tip vortex on wake flow is weakened, energy loss is reduced, and working efficiency is improved.
As shown in fig. 3 and 4, the second embodiment of the axial flow fan blade of the present invention is that the blade 1 is an arc, the tip portion of the blade 1 is provided with a flap 101, the cross section of the flap 101 is an arc, one end of the flap 101 is welded or riveted to the tip portion of the blade 1, the other end faces the pressure surface, and the angle α between the flap 101 and the blade 1 is set to be 90 °.
As shown in fig. 5 and 6, the third embodiment of the axial flow fan blade of the present invention is that the cross section of the blade 1 is a wing type, the tip portion of the blade 1 is provided with the flap 101, the flap 101 is formed by bending the tip portion of the blade 1 toward the suction surface, and the bending angle α is set to 120 °.
As shown in fig. 7 and 8, the fourth embodiment of the axial flow fan blade of the present invention, the cross section of the blade 1 is a wing type, the tip portion of the blade 1 is provided with a flap 101, the flap 101 is formed by bending the tip portion of the blade 1 toward the pressure surface, and the bending angle α is set to 90 °.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides an axial fan blade structure with reduce apex vortex noise, includes wheel hub and blade, the blade is equipped with a plurality of, this blade one end and wheel hub fixed connection, blade and wheel hub connecting portion are blade root portion, and the other end is the tiptoe portion, its characterized in that the tiptoe portion of blade is equipped with the flap, flap one end and blade fixed connection, the other end are the free end to towards the pressure surface or towards the suction surface.
2. The axial fan blade structure with tip vortex noise reduction of claim 1, wherein: the cross section of the blade is arc-shaped, the cross section of the flap is arc-shaped, the flap is directly formed by bending the tip part of the blade, and the bending direction faces to the pressure surface/suction surface.
3. The axial fan blade structure with tip vortex noise reduction of claim 1, wherein: the cross section of the blade is of a wing type, the cross section of the flap is of a wing type, the blade tip part of the blade is directly bent and formed, and the bending direction faces to the pressure surface/suction surface.
4. The axial fan blade structure with tip vortex noise reduction of claim 1, wherein: the cross section of the flap is arc-shaped, one end of the flap is fixedly connected with the tip part of the blade through riveting or welding, and the other end of the flap is a free end and faces to the pressure surface/suction surface.
5. The axial fan blade structure with tip vortex noise reduction of claim 1, wherein: the cross section of the flap is of a wing type, one end of the flap is fixedly connected with the tip part of the blade through riveting or welding, and the other end of the flap is a free end and faces to a pressure surface/a suction surface.
6. The blade structure of an axial flow fan with reduced tip vortex noise according to any one of claims 1 to 5, wherein: the angle between the flap and the blade is set to be 90-120 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921563498.7U CN210484191U (en) | 2019-09-19 | 2019-09-19 | Axial flow fan blade structure capable of reducing blade tip vortex noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921563498.7U CN210484191U (en) | 2019-09-19 | 2019-09-19 | Axial flow fan blade structure capable of reducing blade tip vortex noise |
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| CN210484191U true CN210484191U (en) | 2020-05-08 |
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| CN201921563498.7U Active CN210484191U (en) | 2019-09-19 | 2019-09-19 | Axial flow fan blade structure capable of reducing blade tip vortex noise |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113002771A (en) * | 2021-03-26 | 2021-06-22 | 吉林大学 | Low-noise unmanned aerial vehicle rotor |
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2019
- 2019-09-19 CN CN201921563498.7U patent/CN210484191U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113002771A (en) * | 2021-03-26 | 2021-06-22 | 吉林大学 | Low-noise unmanned aerial vehicle rotor |
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