CN102865237A - Axial flow fan - Google Patents

Abstract

The invention provides an axial flow fan which comprises a motor and a wind wheel. The wind wheel is mounted on an outer rotor of the motor, blades are arranged on the wind wheel, a baffle is arranged at the outer edge of the front surface of each blade, and the rear edge of each blade is saw-toothed. The axial flow fan with the structure is high in efficiency and low in noise.

Description

Axial-flow blower

Technical field:

The present invention relates to the aeration technology field, specifically is a kind of axial-flow blower that is used on the ventilation equipment.

Background technique:

Axial-flow blower generally comprises wind wheel and motor, the middle part interference fit of wind wheel press fit on the external rotor of motor, the external rotor of motor rotates and drives the wind wheel rotation, gas is subjected to the fan blade in the wind wheel to agitate vertically motion, thereby axially air-out, in order to prevent hurting sb.'s feelings when wind wheel from rotating, generally also be provided with guard and wrapping wind wheel, prevent that the people from removing to contact the fan blade on the wind wheel.

Leaf blade on the axial-flow blower of the prior art generally is to adopt the iron plate of even thickness to make, and is generally level and smooth straight line or curvilinear structures.Adopt this structure, when wind wheel rotates, wind spills from the outward edge of blade easily, drain to the side, thereby cause the flow of wind of axial-flow blower less, efficient is not high, and because front edge, rear edge and the outward edge of blade are streamlined, therefore when wind during from the rear edge outflow of blade, the contact length of wind and blade is shorter, and noise is larger.

Summary of the invention:

The objective of the invention is, overcome existing technological deficiency, the axial-flow blower that a kind of efficient is higher and noise is less is provided.

Technological scheme provided by the invention is: the invention provides a kind of axial-flow blower, it comprises motor and wind wheel, described wind wheel is contained on the external rotor of motor, described wind wheel is provided with blade, the outer edge in the front of described each blade is equipped with baffle plate, and the rear edge of described each blade is zigzag fashion.

The rear edge of described each blade is the rear edge that zigzag fashion refers to described each blade and is equipped with several continuous triangular hills.

Adopt said structure, the present invention has the following advantages:

Axial-flow blower of the present invention is provided with baffle plate in the outer edge in the front of each blade of wind wheel (being the one side of the air-out of blade), can stop wind to leak from the outer edge of blade, prevent that the side from leaking out, thereby increase the flow of the wind in axial-flow blower front, improved the efficient of axial-flow blower, and the rear edge of blade is designed to profile of tooth, when blade rotation, wind flows out from the rear edge of blade, can increase effective contact length of blade and wind, thereby can reduce noise.

As improvement, the thickness of the intermediate portion of described each blade all front edge and the antemarginal thickness than this blade is large.Adopt this structure, the sectional shape of blade is the sectional shape of similar wing, is conducive to increase the air pressure on the forward and backward two sides of blade, thereby can significantly increase the flow of outlet air surface, and efficient is higher.

As preferably, described baffle plate and blade are one-body molded.Adopt this structure, fairly simple, process more convenient.

Description of drawings:

Accompanying drawing 1 is the structural representation of axial-flow blower of the present invention;

Accompanying drawing 2 is the structural representation of the fan blade in the axial-flow blower;

Accompanying drawing 3 for the A-A among Fig. 2 to analysing and observe enlarged diagram;

As shown in the figure: 1, motor, 2, wind wheel, 3, guard, 4, blade, 4.1, baffle plate, 4.2, rear edge, 4.3, outward edge, 4.4, front edge.

Embodiment:

Below in conjunction with the drawings and specific embodiments the present invention is elaborated:

Such as Fig. 1, Fig. 2, shown in Figure 3: the invention provides a kind of axial-flow blower, it comprises motor 1, wind wheel 2 and guard 3, described wind wheel 2 is contained on the external rotor of motor 1, the centre of wind wheel 2 press fit on the external rotor of motor 1 in the present embodiment by interference fit, wind wheel 2 rotates along with the rotation of external rotor, described guard 3 is contained on the end cap of motor 1, described wind wheel 2 is provided with blade 4, outward edge 4.3 places in the front of described each blade 4 are equipped with baffle plate 4.1, and the rear edge 4.2 of described each blade 4 is zigzag fashion.

The rear edge 4.2 of described each blade 4 is the rear edge 4.2 that zigzag fashion refers to described each blade 4 and is equipped with several continuous triangular hills.

Above-mentioned zigzag fashion is common described pointed tooth, and described zigzag fashion also has a kind of flat tooth that is, namely the rear edge 4.2 of each blade 4 is equipped with several continuous trapezoidal projections.

Axial-flow blower of the present invention is provided with baffle plate 4.1 in the outer edge in the front of each blade 4 of wind wheel 2 (being the one side of the air-out of blade), can stop wind to leak from the outward edge 4.3 of blade 4, prevent that the side from leaking out, thereby increase the flow of the wind in axial-flow blower front, improved the efficient of axial-flow blower, and the rear edge 4.2 of blade 4 is designed to profile of tooth, when blade 4 rotates, wind flows out from the rear edge of blade 4, effective contact length of blade 4 and wind can be increased, thereby noise can be reduced.

As improvement, the thickness of the intermediate portion of described each blade 4 all thickness than the front edge 4.4 of this blade 4 and rear edge 4.2 is large.Adopt this structure, the sectional shape of blade 4 is the sectional shape of similar wing, is conducive to increase the air pressure on the forward and backward two sides of blade 4, thereby can significantly increase the flow of outlet air surface, and efficient is higher.

Because the front and back of blade 4 all needs to be designed to streamlined.Therefore, the structure that adopts in the present embodiment is that the cross section in the front of blade 4 is arc, the cross section at blade 4 back sides also is arc, the diameter of the arc in the cross section in blade 4 fronts is larger than the diameter of the arc in the cross section at blade 4 back sides, adopt this structural design, all the thickness than the front edge 4.4 of this blade 4 and rear edge 4.2 is large can to make the thickness of intermediate portion of blade 4.

As preferably, described baffle plate 4.1 is one-body molded with blade 4.Baffle plate described in the present embodiment 4.1 is stretched out by the outward edge of blade 4 and forms towards the positive bending of blade 4.Adopt this structure, fairly simple, process more convenient.

Claims (4)

1. axial-flow blower, it comprises that motor (1) and the described wind wheel of wind wheel (2) (2) are contained on the external rotor of motor (1), described wind wheel (2) is provided with blade (4), it is characterized in that: the outward edge (4.3) in the front of described each blade (4) locates to be equipped with baffle plate (4.1), and the rear edge (4.2) of described each blade (4) is zigzag fashion.

2. axial-flow blower according to claim 1 is characterized in that: the rear edge (4.2) of described each blade (4) is the rear edge (4.2) that zigzag fashion refers to described each blade (4) and is equipped with several continuous triangular hills.

3. axial-flow blower according to claim 1 is characterized in that: the thickness of the intermediate portion of described each blade (4) all thickness than the front edge (4.4) of this blade (4) and rear edge (4.2) is large.

4. axial-flow blower according to claim 1 is characterized in that: described baffle plate (4.1) is one-body molded with blade (4).

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