CN211259124U

CN211259124U - Ultra-silent structure flabellum

Info

Publication number: CN211259124U
Application number: CN201921926979.XU
Authority: CN
Inventors: 刘兴
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-08-14
Anticipated expiration: 2029-11-04

Abstract

The utility model discloses a super-silent structure flabellum, including the blade, its characterized in that: the front edge and the rear edge of each blade are provided with comb tooth structures; the upper surface and the lower surface of the blade are covered with a convex structure. The front edge comb teeth can uniformly divide and break high-frequency vortexes generated by the front edge of the blade impacting air into smaller lower-frequency vortexes, and can generate reverse vortexes and transmit the reverse vortexes to a boundary layer on the surface of the blade, so that the separation of the boundary layer is weakened, and the vortex shedding noise is reduced; the raised structure on the surface of the blade can increase the thickness and stability of the boundary layer of the blade, and form a layer of air film on the surface of the blade, thereby preventing high-speed air flow from directly rubbing the blade to generate friction noise and better transmitting reverse vortex generated by front-edge comb teeth; the rear edge comb teeth can effectively level turbulence and vortex after the high-speed airflow is separated from the blades and the transmitted reverse vortex, so that the airflow wake of the blades is smooth, and finally, the noise is comprehensively reduced.

Description

Ultra-silent structure flabellum

Technical Field

The utility model relates to a flabellum technical field especially relates to a super-silent structure flabellum.

Background

Fan blade structures such as fans and propellers are widely used in many aspects of human life and work, including fans, air conditioners, airplanes, helicopters, steam turbines and the like, but due to the problem of blade design, noise which is difficult to ignore is generated when the blades rotate at high speed, and the human health is damaged to different degrees after the blades are in the environment for a long time.

When the fan or the propeller rotates at high speed, the noise generated by the blades mainly comes from three aspects: first, the pressure of the air impacting the leading edge of the blade; second, the friction force between the surface of the blade and the air; and thirdly, the air is discretely collided at the trailing edge of the blade through the vortex generated by the blade. A large number of bionics studies on owls show that noise can be reduced comprehensively by improving the blade design.

However, most of the current fan blade noise reduction designs are realized by only reducing the rotating speed of the blades, and other noise reduction modes are not emphasized or considered a little.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems of the prior art, and the object of the utility model is to provide a super-silent structure fan blade, which can greatly reduce the noise generated when a fan or a propeller rotates at high speed and weaken the air impulse of the fan blade structure.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an ultra-silent structure flabellum, includes the blade, its characterized in that: the front edge and the rear edge of each blade are provided with comb tooth structures; the upper surface and the lower surface of the blade are covered with a convex structure.

The comb tooth structure is one or more of comb teeth, saw teeth, rows of spikes, brushes and wings.

The raised structure is one or more of short thorns, seta, fluff, fibers and scales.

The convex structure inclines forwards or backwards.

The comb tooth structure is made of one or more of plastic, fiber, metal and composite material.

The protruding structure is made of one or more of plastic, fiber, metal and composite material.

Due to the adoption of the scheme, the beneficial effects of the utility model are that:

the front edge comb teeth can uniformly divide and break high-frequency vortexes generated by the front edge of the blade impacting air into smaller lower-frequency vortexes, and can generate reverse vortexes and transmit the reverse vortexes to a boundary layer on the surface of the blade, so that the separation of the boundary layer is weakened, and the vortex shedding noise is reduced; the raised structure on the surface of the blade can increase the thickness and stability of the boundary layer of the blade, and form a layer of air film on the surface of the blade, thereby preventing high-speed air flow from directly rubbing the blade to generate friction noise and better transmitting reverse vortex generated by front-edge comb teeth; the rear edge comb teeth can effectively level turbulence and vortex after the high-speed airflow is separated from the blades and the transmitted reverse vortex, so that the airflow wake of the blades is smooth, and finally, the noise is comprehensively reduced.

Drawings

Fig. 1 is an isometric view of an embodiment of the present invention.

FIG. 2 is an isometric view of a single blade of the embodiment shown in FIG. 1.

In the figure: 1. the blade, 2, the front edge spine, 3, the rear edge comb teeth and 4, the surface burr.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 to 2 show an ultra-silent structure of an unmanned aerial vehicle fan blade, which comprises a blade 1, a front edge spine 2, a rear edge comb tooth 3, and surface burrs 4.

The body of the blade 1, the front edge spine 2, the rear edge comb teeth 3 and the surface burrs 4 are made of ABS material and are integrally injection molded. The flabellum is that axisymmetric two curved surface blades 1 of thickness 1mm constitute, and the front edge of every blade 1 is one row of spine 2 of length 2mm, and the trailing edge is one row of broach 3 of length 15mm, and 1 surface evenly distributed of blade is long 2mm burr 4, and burr 4 all hypsokinesis 60.

When the fan blades rotate at a high speed, after impact air flow impacting the front edges of the blades 1 passes through the front edge spine 2, generated high-frequency vortexes are evenly divided and scattered into smaller low-frequency vortexes, and the front edge spine 2 can generate reverse vortexes and transmit the reverse vortexes to the surface boundary layers of the blades 1, so that the separation of the boundary layers is weakened, and the vortex shedding noise is reduced. The thickness and the stability of the boundary layer of the blade 1 are increased by the layer of burrs 4 covered on the outer surface of the blade 1, a layer of air film is formed on the surface of the blade 1, the high-speed air flow is prevented from directly rubbing with the surface of the blade 1 to generate friction noise, and reverse vortex generated by the front edge sharp burrs 2 can be better transmitted. The rear edge comb teeth 3 can effectively level turbulence and vortex after the high-speed airflow is separated from the blades 1 and transfer the reverse vortex, so that the airflow wake of the blades 1 is smooth, and finally, the noise is comprehensively reduced.

The present invention is not limited by the above embodiments, and the present invention can be modified in various ways without departing from the spirit and scope of the present invention, and these modifications and changes fall into the scope of the present invention.

Claims

1. The utility model provides an ultra-silent structure flabellum, includes the blade, its characterized in that: the front edge and the rear edge of each blade are provided with comb tooth structures; the upper surface and the lower surface of the blade are covered with a convex structure.

2. The fan blade of claim 1, wherein: the comb tooth structure is one or more of comb teeth, saw teeth, rows of spikes, brushes and wings.

3. The fan blade of claim 1, wherein: the raised structure is one or more of short thorns, seta, fluff, fibers and scales.

4. The fan blade of claim 1, wherein: the convex structure inclines forwards or backwards.

5. The fan blade of claim 1, wherein: the comb tooth structure is made of one or more of plastic, fiber, metal and composite material.

6. The fan blade of claim 1, wherein: the protruding structure is made of one or more of plastic, fiber, metal and composite material.