CN215409415U

CN215409415U - Axial fan

Info

Publication number: CN215409415U
Application number: CN202121154056.4U
Authority: CN
Inventors: 齐凤; 程守炤; 覃万翔; 叶涛
Original assignee: Guangdong Sunwill Precising Plastic Co Ltd
Current assignee: Guangdong Sunwill Precising Plastic Co Ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2022-01-04
Anticipated expiration: 2031-05-26

Abstract

An axial flow fan comprises a hub and a plurality of blades annularly arranged on the periphery of the hub, wherein a protruding region is arranged at the position, close to the hub, of a trailing edge molded line of each blade, and the element stage with the longest blade chord length L is positioned on the protruding region; the molded line of the trailing edge of the blade is reverse S-shaped or approximately reverse S-shaped; the blade mounting angle of the element level of the blade close to the hub is beta 1, the blade mounting angle of the element level of the protrusion area is beta 2, the blade mounting angle of the element level of the blade close to the outer edge area is beta 3, and beta 2> beta 1& & beta 2> beta 3; the outer diameter of the hub is d0, the outer diameter of the axial flow fan is d2, the hub ratio of the axial flow fan is epsilon, epsilon is d0/d2, and epsilon is more than or equal to 0.1 and less than or equal to 0.2; the shape of the leaves is longan leaf shape or similar to longan leaf shape. The axial flow fan has the advantages that through the improvement of the structure, the air outlet of the fan is concentrated, the air dispersion is small, the air supply distance is small, and the fan has the pneumatic advantages of large air quantity, high efficiency and low noise on the premise of no pressurization.

Description

Axial fan

Technical Field

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

Background

Chinese patent document No. CN112483465A discloses a compound swept-curved axial fan structure and its design method in 2021, 3/12/month, which includes a hub and blades; the stacking mode of the blades is that the blades are stacked in a point mode in the chord length of the section of each blade, the bent stacking line is a parabola, the swept stacking line is a cubic B-spline curve, and the outer edge of each blade is of a flanging structure; the blade height direction of the blade is defined as the positive direction of an axis Y, the axis direction of the hub is the direction of an axis X, the radius of the section of the hub is RH, the radius of the section of the blade top is RT, and the radius of any section between the hub and the blade top is RH. The axial flow fan has the problems of non-centralized air outlet and large air supply distance, and the axial flow fan has small air volume and large noise on the premise of no pressurization.

Therefore, further improvements are needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an axial flow fan which is simple in structure, concentrated in air outlet, small in air supply distance, large in air quantity, low in noise and strong in practicability, so as to overcome the defects in the prior art.

An axial fan designed according to this purpose, including wheel hub and a plurality of blades of annular setting in the wheel hub periphery, its characterized in that: a protruding area is arranged at the position, close to the hub, of the molded line of the tail edge of the blade, and the element stage with the longest blade chord length L is located on the protruding area.

The molded line of the trailing edge of the blade is in a reverse S shape or an approximate reverse S shape.

The blade mounting angle of the element level of the blade close to the hub is beta 1, the blade mounting angle of the element level of the protrusion area is beta 2, and the blade mounting angle of the element level of the blade close to the outer edge area is beta 3, beta 2> beta 1& & beta 2> beta 3.

The outer diameter of the hub is d0, the outer diameter of the axial flow fan is d2, the hub ratio of the axial flow fan is epsilon, epsilon is d0/d2, and epsilon is more than or equal to 0.1 and less than or equal to 0.2.

The shape of the leaves is longan tree leaf shape or similar to longan tree leaf shape.

The blade trailing edge molded line of the axial flow fan is approximate to a reverse S shape, namely, the trailing edge molded line is close to a hub region and has a protrusion region, a primitive stage exists in the protrusion region, the chord length of the blade on the primitive stage is longest, the fan blade has three primitive stages (a schematic drawing of three fan primitive stages is shown in figures 4-6), the installation angle (beta 1, beta 2 and beta 3) of the blade meets the requirement that beta 2> beta 1& & beta 2> beta 3, wherein beta 1 is the primitive stage close to the hub, beta 2 is the primitive stage of the protrusion region, and beta 3 is the primitive stage close to an outer edge region, and the structure enables the air outlet of the axial flow fan to be concentrated, the air dispersion is small, and the air supply distance is small; the blade profile of the axial flow fan is similar to longan leaves, and the value range of the hub ratio (epsilon-d 0/d2) is as follows: epsilon is more than or equal to 0.1 and less than or equal to 0.2, and the structure ensures that the axial flow fan has the pneumatic advantages of large air quantity, high efficiency and low noise on the premise of no pressurization.

Drawings

Fig. 1 is a schematic view of an overall structure of an axial flow fan according to an embodiment of the present invention.

Fig. 2 is a front view of an axial flow fan according to an embodiment of the present invention.

FIG. 3 is a front view of an alternative orientation of an axial fan in an embodiment of the present invention.

Fig. 4 is a sectional view taken along a-a in fig. 3.

Fig. 5 is a sectional view taken in the direction B-B in fig. 3.

Fig. 6 is a sectional view taken along the direction C-C in fig. 3.

Detailed Description

The utility model is further described with reference to the following figures and examples.

Referring to fig. 1-6, the axial flow fan comprises a hub 1 and a plurality of blades 2 annularly arranged on the periphery of the hub 1, wherein a protruding area 2.2 is arranged at a position, close to the hub 1, of a trailing edge molded line 2.1 of each blade 2, an elementary stage exists in the protruding area 2.2, and the chord length L of each blade 2 on the elementary stage is longest; the trailing edge profile 2.1 of the blade 2 is approximately reverse S-shaped; the blade setting angle of the element stage of the blade 2 near the hub 1 is β 1 (see fig. 4), the blade setting angle of the element stage of the protrusion area 2.2 is β 2 (see fig. 5), and the blade setting angle of the element stage of the blade 2 near the outer edge area is β 3 (see fig. 6), and β 2> β 1& & β 2> β 3. The structure ensures that the air outlet of the axial flow fan is concentrated, the air dispersion is small, and the air supply distance is small.

The outer diameter of the hub 1 is d0, the outer diameter of the axial flow fan is d2, the hub ratio of the axial flow fan is epsilon, epsilon is d0/d2, and epsilon is more than or equal to 0.1 and less than or equal to 0.2; the shape of the leaf 2 is similar to the shape of a longan tree. The structure enables the axial flow fan to have pneumatic advantages of large air quantity, high efficiency and low noise on the premise of no pressurization.

The foregoing is a preferred embodiment of the present invention, and the basic principles, principal features and advantages of the utility model are shown and described. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the utility model, but that various changes and modifications may be made without departing from the spirit and scope of the utility model, and the utility model is intended to be protected by the following claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an axial fan, includes that wheel hub (1) and annular set up a plurality of blades (2) in wheel hub (1) periphery, its characterized in that: a protruding area (2.2) is arranged at a position, close to the hub (1), of a trailing edge molded line (2.1) of the blade (2), and the element stage with the longest chord length L of the blade (2) is located on the protruding area (2.2).

2. The axial fan according to claim 1, wherein: the trailing edge profile (2.1) of the blade (2) is in a reverse S shape or approximately in a reverse S shape.

3. The axial flow fan according to claim 2, wherein: the blade mounting angle of the blade (2) close to the element level of the hub (1) is beta 1, the blade mounting angle of the element level of the protrusion area (2.2) is beta 2, and the blade mounting angle of the blade (2) close to the element level of the outer edge area is beta 3, beta 2> beta 1& & beta 2> beta 3.

4. The axial flow fan according to claim 3, wherein: the outer diameter of the hub (1) is d0, the outer diameter of the axial flow fan is d2, the hub ratio of the axial flow fan is epsilon, epsilon is d0/d2, and epsilon is not less than 0.1 and not more than 0.2.

5. The axial fan according to any one of claims 1 to 4, wherein: the shape of the leaf (2) is longan leaf shape or similar to longan leaf shape.