WO2009111956A1

WO2009111956A1 - An axial flow fan for decreasing the noise and the energy consumption

Info

Publication number: WO2009111956A1
Application number: PCT/CN2009/070153
Authority: WO
Inventors: 韩玮
Original assignee: Han Wei
Priority date: 2008-03-12
Filing date: 2009-01-15
Publication date: 2009-09-17
Also published as: CN201212489Y

Abstract

An axial flow fan comprises a hub (2) and a plurality of blades(1) extending radially outwardly from the hub(2),a single-side arc brim(5) is provided at the tip each blade. The axial flow fan characterizes in that the angle or the average angle between the negative pressure face of the blades and the radial directions of the axial flow fan is 0^o-90^o, the optimum scope of the angle or the average angle is 6^o -50^o. The fan can decrease the noise and the energy consumption,and can be used widely in varieties of fields such as all kinds of the axial flow fans,the axial flow motors and the fluidtransportation and stir machine.

Description

Axial flow fan for reducing energy consumption and noise

The present invention relates to an axial flow fan, and more particularly to a technique for improving the efficiency of an axial flow fan and reducing energy consumption and noise. Background technique

The inventor cooperated with other inventors in 2000 to submit a patent application to the Chinese Intellectual Property Office, the title of the invention "High Performance Propeller", Patent Application No. CN00111209.0, International Patent Application submitted in 2001, International Application No.: pet /cnOl/00112, the application in the United States has been authorized, patent number US6866482 B2, name: HIGN-PERFORMENCE

PROPELLER. This application relates to an axial fan technology having a single-sided curved blade edge paddle structure, which is a further development based on the above techniques.

The position, movement trajectory and motion characteristics of the unilateral curved edge are described as follows in the international application specification: "The parts of the rim are basically the same as the center of the propeller, and the same part of the lobes are projected on the same axis of rotation in the axial direction of the propeller. In principle, it is required that the blade edge only generates frictional resistance in the direction of rotation. In the case of the inclination of the blade edge, the blade edge produces a shape force that increases or decreases the pressure at the blade tip end. The blade edge can be rotated in the blade direction as needed. Appropriate expansion in an approximate involute pattern. Summary of the invention

The axial fan technology with single-edge curved blade edge paddle structure described above finds a single-sided curved blade edge of the same shape structure in the experiment, and is used on a part of the axial flow fan to save energy and noise reduction effect. Very good, but on another part of the axial fan, there is no energy saving noise reduction effect. Since it is unclear what the reason is, it is impossible to confidently design such an axial flow fan with energy-saving and noise-reducing effects, which seriously hinders the application of this technology.

The invention finds that the problem is independent of the unilateral curved blade edge structure, shape, position, spatial motion trajectory, etc. through a large number of research and experiments. Through a large number of experiments and studies, the angle between the negative pressure surface of the blade and the radial direction of the axial fan is found. It plays a key role in energy saving effect. When the angle β is positive, the axial fan with single-sided curved blade edge structure has very good energy-saving and noise-reducing effect, as shown in Figure 1; Negative value, the axial flow fan with single-sided curved blade edge structure has little energy-saving and noise-reducing effect, and does not even have energy-saving and noise-reducing effects, as shown in Fig. 2.

It is found that when the angle β is positive, the negative pressure surface of the blade can be fully replenished, and the absolute value of the pressure on the negative pressure surface of the blade is reduced, thereby reducing the pressure resistance of the blade and the resistance of the blade. Energy consumption is reduced. Since the absolute value of the pressure on the negative pressure surface of the blade is reduced, the pressure difference from the surrounding space is reduced, and the flow velocity of the fluid to the negative pressure surface of the blade is lowered, so that the eddy current intensity is also reduced correspondingly, and the noise is also correspondingly reduced. The above effect is most pronounced at the blade end, because it is the fastest fan speed, the most powerful force, the largest pressure gradient, and the paddle speed range used by most fans. The force generated by the negative pressure surface of the blade is much larger than the positive pressure surface, so the absolute value of the negative pressure surface pressure of the blade is reduced, and the energy saving and noise reduction effect is very significant.

The technical solution adopted by the present invention to solve the technical problem thereof is: an axial flow fan blade having a single-sided curved blade edge blade structure, and an angle β between the negative pressure surface of the blade and the radial direction of the axial fan is 0. Between 90 degrees, or an axial fan blade having a single-sided curved blade-edge blade structure, the average angle β between the negative pressure surface of the blade and the radial direction of the axial fan is between 0 and 90 degrees Between the studies and experiments, it was found that the angle between the angle β or the average angle β is optimally between 6 and 50 degrees.

The invention has the beneficial effects that the technical obstacles are eliminated for the application of the single-sided curved blade edge blade technology, which lays a foundation and provides a feasible implementation scheme for designing and manufacturing a high-efficiency, low-noise axial flow fan, thereby avoiding energy saving. Under the condition that the principle of noise reduction is not clear, the loss caused by blind design under the condition of reliable implementation technical solution makes the energy-saving and noise-reduction technology of single-sided curved blade edge blade reach the application level.

DRAWINGS

The invention will now be further described with reference to the drawings and embodiments.

Figure 1 is a graphical representation of the positive angle β between the negative pressure surface of the blade and the radial direction of the axial fan.

Figure 2 is a graphical representation of the negative angle β between the negative pressure surface of the blade and the radial direction of the axial fan.

Fig. 3 is a graphical representation of the average angle β between the negative pressure surface of the blade and the radial direction of the fan in the case where the surface of the single-sided curved blade edge and the blade negative pressure surface are curved. Figure 4 is a graphical representation of the average angle β between the negative pressure surface of the blade and the radial direction of the fan in the case where the negative pressure surface of the blade is curved.

Figure 5 is a blade with a single-sided curved blade edge and blade forming an integral structure, there is no obvious boundary between the single-sided curved blade edge and the blade, in this case, the blade negative pressure surface and the axial flow fan A graphical representation of the average angle β between the radial directions.

Fig. 6 is a schematic view showing the names and specific positions of the respective portions of the axial flow fan of the single-sided curved blade edge paddle structure. 1. Blade, 2. Hub, 3. Blade root, 4. Blade end, 5. Single-sided curved edge, 6. Axial fan radially flowing toward the negative pressure surface of the blade Fluid, 7. Blade negative pressure surface.

detailed description

In the embodiment shown in Fig. 1, the angle between the negative pressure surface (7) of the blade (1) having a single-sided curved blade edge and the radial direction of the axial fan is positive, by the blade Outside the end (4), the fluid (6) flowing radially along the axial fan can reach the boundary layer of the negative pressure surface (7) of the blade, which can reduce the absolute value of the pressure on the negative pressure surface (7) of the blade. , reduce the pressure resistance of the blade, thereby reducing blade resistance, reducing blade energy consumption, and reducing noise.

In Fig. 2, the angle value of the angle β between the negative pressure surface (7) of the blade and the radial direction of the axial fan is negative. From the outside of the blade end (4), the fluid (6) flowing radially along the axial fan cannot reach the boundary layer of the negative pressure surface (7) of the blade, and the pressure of the negative pressure surface (7) of the blade is substantially absent. Change, so there is no energy saving noise reduction effect.

In the embodiment shown in Fig. 3, the angle value of the average angle β between the negative pressure surface (7) of the blade and the radial direction of the axial fan is positive, the edge of the curved edge of the blade (5) and the negative pressure of the blade The surface of the joint surface (7) is a curved surface shape, and the fluid flowing along the negative pressure surface of the blade shape has a small energy loss, a reduced vortex vorticity, and an energy saving and noise reduction effect is further improved.

In the embodiment shown in Fig. 4, the angle value of the average angle β between the negative pressure surface of the blade and the radial direction of the axial fan is positive, and the edge of the curved edge of the single side (5) is opposite to the axial direction of the axial fan. Inclination, the fluid flows along the curved surface of the blade with the curved surface of the unilateral curved edge (5) and the unilateral curved edge (5) and the negative pressure surface of the blade, resulting in less energy loss and energy saving. The noise effect is further improved.

In the embodiment shown in FIG. 5, the blade with the single-sided curved blade edge and the blade forming an integral structure has no obvious boundary line between the single-sided curved blade edge and the blade, and the blade negative pressure surface and the single-sided arc The shape of the shape of the blade is integrally curved, and the angle between the negative pressure surface of the integrated structure and the radial angle of the fan is positive, at the root of the blade (3) near the hub and the middle of the blade, the blade The angle value of the average angle β between the negative pressure surface and the fan radial direction is a negative value. Since the angle β is a negative value, the blade linear velocity is low, which has no major effect on the overall energy saving and noise reduction effect. The axial flow fan The overall still has good energy saving and noise reduction effects.

This technology is used in axial compressors, especially in the first stage, which increases fluid intake, reduces tip leakage losses, reduces power consumption, and improves compression performance.

The technology of the present invention can be applied to fluid machines such as propellers, axial flow fans, axial flow blowers, axial flow compressors, fans, axial flow pumps, wind fire extinguishers, and the like, or various fluid machines for agitating fluids.

The blade of the present invention can be produced by casting, die casting, injection molding, stamping, mechanical cutting, welding, and the like. Description:

Average angle β: The angle between the line connecting the two ends of the curve and the radial direction of the axial fan is the average angle β; or the average value of the angle between the tangent of each point of the curve and the radial direction of the axial fan is the average angle β .

The invention sets the radial direction of the axial flow fan and the axial direction of the axial flow fan to be perpendicular to each other.

Claims

Right

1. An axial fan that reduces energy consumption and noise, with a plurality of blades (1) mounted on the hub (2) and a single curved edge (5) on the blade (1), or The hub (2) is provided with a plurality of single-sided curved edge (5) and a blade formed integrally with the blade (1), characterized by: a clamp between the negative pressure surface of the blade and the radial direction of the axial fan The angle β is between 0 and 90 degrees, or the average angle β between the negative pressure surface of the blade and the radial direction of the axial fan is between 0 and 90 degrees.

The axial flow fan according to claim 1, wherein: an angle β between the negative pressure surface of the blade and the radial direction of the axial fan is between 6 degrees and 50 degrees, or a negative pressure surface of the blade The average angle β between the radial directions of the axial fans is between 6 and 50 degrees.