CN215409414U

CN215409414U - Axial flow fan blade

Info

Publication number: CN215409414U
Application number: CN202121138496.0U
Authority: CN
Inventors: 程守炤; 覃万翔; 齐凤
Original assignee: Guangdong Sunwill Precising Plastic Co Ltd
Current assignee: Guangdong Sunwill Precising Plastic Co Ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2022-01-04
Anticipated expiration: 2031-05-25

Abstract

The utility model discloses an axial flow fan blade, which comprises a hub and a blade; the blades are arranged on the circumferential side wall of the hub; the blade is provided with an outer edge, a plurality of grooves are formed in the back pressure surface of the blade and are arranged at intervals along the outer edge in sequence, and the grooves extend towards the inside of the axial flow fan blade. The back pressure surface of the utility model is provided with the groove, and part of gas flowing at low speed is generated in the groove because of being retarded by viscosity, so that stable secondary vortex is formed, the function of a rolling bearing in machinery is generated, the effect of reducing viscous resistance is achieved, and the efficiency of the fan is improved.

Description

Axial flow fan blade

Technical Field

The utility model relates to the field of axial flow fans, in particular to an axial flow fan blade.

Background

When the air flow flows in the axial flow fan, the air flow can rub the surface of the blade, so that the full pressure of the fan can be reduced in order to overcome the resistance generated by friction when the fluid flows, the flow loss is increased, and the efficiency is reduced.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides the axial flow fan blade capable of increasing the efficiency.

The axial flow fan blade comprises a hub and a blade; the blades are mounted on the circumferential side wall of the hub; the blade has the outer fringe, be equipped with a plurality of recesses on the backpressure face of blade, it is a plurality of the recess is followed the outer fringe sets gradually at interval, just the recess court extend in the axial fan blade.

The axial flow fan blade provided by the embodiment of the utility model at least has the following technical effects: the back pressure face is equipped with the recess, and the recess is inside owing to receive the stickness to block the gas that produces partial low-speed flow, has formed stable secondary vortex, has produced antifriction bearing's in the machinery effect, has reached the effect that reduces the stickness resistance, improves fan efficiency.

According to some embodiments of the utility model, a plurality of the grooves are parallel to each other.

According to some embodiments of the utility model, the groove is a ridge structure of the "V" shape.

According to some embodiments of the utility model, a groove depth of the groove is defined as h, a groove width of the groove is defined as s, 0.3mm < s <0.8mm, 0.3mm < h <0.8 mm.

According to some embodiments of the utility model, the groove pitch between two of said grooves is defined as a, 0.5s < a <1.5 s.

According to some embodiments of the utility model, the intersection of the leading edge and the outer edge is a blade tip, and the back pressure surface adjacent to the blade tip is a smooth surface.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

Additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic top view of an axial-flow fan blade according to an embodiment of the present invention;

FIG. 2 is an enlarged view of FIG. 1 at A;

fig. 3 is a schematic structural view of a blade with a groove.

Reference numerals: hub 100, blade 200, outer rim 210, groove 220, leading edge 230, tip 240, surface 250, inner rim 260, trailing edge 270.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the description related to the orientation, such as the orientation or positional relationship indicated by the upper, lower, etc., is based on the orientation or positional relationship shown in the drawings. This is done solely for the purpose of facilitating the description of the utility model and simplifying the description without indicating or implying that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation and therefore should not be construed as limiting the utility model.

In the description of the present invention, unless otherwise specifically limited, installation and connection terms should be construed broadly, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in consideration of the technical details.

Referring to fig. 1, an axial-flow fan blade according to an embodiment of the present invention includes a hub 100 and a blade 200; blades 200 are blades 200 mounted on the circumferential side wall of hub 100; the blade 200 has an outer edge 210, a plurality of grooves 220 are arranged on the back pressure surface of the blade 200, the plurality of grooves 220 are arranged at intervals along the outer edge 210, and the grooves 220 extend towards the inside of the axial flow fan blade.

For example, as shown in fig. 1, the number of the blades 200 is three, and taking one blade 200 as an example, the blade 200 faces downward, the plurality of grooves 220 are parallel to each other and perpendicular to the horizontal plane, in this case, the grooves 220 extend in three parts, the first part of the grooves 220 extends perpendicularly from the outer edge 210 to the leading edge 230 of the blade 200, the second part of the grooves 220 extends perpendicularly from the outer edge 210 to the inner edge 260 of the blade 200, and the third part of the grooves 220 extends perpendicularly from the outer edge 210 to the trailing edge 270 of the blade 200. The shape of the groove 220 is V-shaped or U-shaped. The back pressure face is equipped with recess 220, and recess 220 is inside owing to receive the stickness to block the gas that produces partial low-speed flow, has formed stable secondary vortex, has produced the effect of antifriction bearing in the machinery, has reached the effect that reduces the stickness resistance, improves fan efficiency.

In some embodiments of the present invention, as shown in FIG. 2, the plurality of grooves 220 are parallel to each other.

In a further embodiment of the present invention, the groove 220 is a ridge structure in the shape of a "V". The groove 220 is in a V shape, compared with other shapes, the formation of secondary vortexes in the V shape is more stable, the generated energy loss is smaller, and the anti-drag effect is better.

In a further embodiment of the utility model, as shown in fig. 3, the groove depth of the groove 220 is defined as h, the groove width of the groove 220 is defined as s, 0.3mm < s <0.8mm, 0.3mm < h <0.8 mm. The fan efficiency can be improved by selecting any range of the fan, and the effect is optimal.

In a further embodiment of the utility model, as shown in fig. 3, the slot pitch between two grooves 220 is defined as a, 0.5s < a <1.5 s. The fan efficiency can be improved by selecting any range of the fan, and the effect is optimal.

In some embodiments of the present invention, as shown in FIG. 1, the intersection of the leading edge 230 and the outer edge 210 is a blade tip 240, and the back pressure surface adjacent to the blade tip 240 is a smooth surface 250. So as not to alter the aerodynamic characteristics of the blade 200 design itself.

In the description herein, references to the description of "some embodiments" or "what is conceivable" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. An axial flow fan blade, comprising:

a hub;

blades mounted on the circumferential side wall of the hub; the blade has the outer fringe, be equipped with a plurality of recesses on the backpressure face of blade, it is a plurality of the recess is followed the outer fringe sets gradually at interval, just the recess court extend in the axial fan blade.

2. The axial-flow fan blade of claim 1, wherein: a plurality of the grooves are parallel to each other.

3. The axial-flow fan blade according to claim 1 or 2, characterized in that: the groove is of a V-shaped ridged structure.

4. The axial-flow fan blade of claim 3, wherein: the groove depth of the groove is defined as h, the groove width of the groove is defined as s, 0.3mm < s <0.8mm, and 0.3mm < h <0.8 mm.

5. The axial-flow fan blade of claim 3, wherein: the groove spacing between two of said grooves is defined as a, 0.5s < a <1.5 s.

6. The axial-flow fan blade of claim 1, wherein: the blade is characterized by also comprising a front edge, wherein the intersection part of the front edge and the outer edge is a blade tip, and a back pressure surface near the blade tip is a smooth surface.