WO2010066140A1 - A fan blade of an axial fan or a centrifugal fan - Google Patents

Abstract

A fan blade of an axial fan or a centrifugal fan comprises a front edge part (1) in an air inflow direction and a back edge part (2) in an air outflow direction, and is characterized in that the back edge part (2) is provided with a plurality of pressure balancing holes (3). Because the back edge part of the fan blade is provided with the plurality of the pressure balancing holes, the fan blade reduces pressure difference between the front and the back of the fan blade, eliminates backflow phenomenon caused by air current separation at a boundary layer of the back edge part, and increases effective functional area of the fan blade, so as to potentially improve power consumption and noise quality, and avoid depositing large amount of dust at the same time.

Description

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 [1] The present invention mainly relates to a fan blade, in particular, a fan blade of an axial fan and a fan blade of a centrifugal fan.

[2] As shown in Fig. 1, the blade of the conventional axial fan has a leading edge portion 1 in the air inflow direction and a trailing edge portion 2 in the air outflow direction. When the blade rotates, the leading edge portion 1 will flow in. The air is pushed forward, and the design of the trailing edge portion 2 facilitates the outflow of air. It has been experimentally proved that: the wind vane rotates, and the air flow is affected by the increase of the rotational kinetic energy at the trailing edge of the vane, resulting in the airflow in the process of flowing out of the trailing edge portion 2, The separation of the boundary layer airflow brings about a reflow phenomenon, and it is easy to deposit a large amount of dust 4 on the trailing edge portion 2 of the windward surface 3. In the experiment, it can be easily found from the cooling axial fan on the computer. The windward side of the blade 2 refers to the same side as the direction of the wind.

 [3] In addition, the blades of the centrifugal fan also have the above technical problems.

[4] In order to overcome the deficiencies of the prior art, an object of the present invention is to provide a fan blade for an axial flow fan, which can reduce the pressure difference between the front and the back of the blade, and eliminate the backflow caused by the separation of the boundary layer at the trailing edge. .

 [5] The blade of an axial fan of the present invention is completed by the following technical solution: a blade of an axial flow fan, including a front edge portion in the air inflow direction and a rear edge portion in the air outflow direction, There are several pressure balance holes on the trailing edge.

 [6] Compared with the prior art, the advantages of the present invention are: designing a plurality of pressure balance holes at the trailing edge of the blade to play the role of self-balancing pressure, reducing the pressure difference between the front and the back of the blade, and eliminating the trailing edge portion. The reflow phenomenon caused by the separation of the boundary layer airflow increases the effective functional area of the blade, thereby potentially improving power consumption and noise quality, while avoiding the deposition of large amounts of dust.

 [7] The several pressure balance holes described above may be array distributed, evenly distributed, or randomly distributed.

[8] The pressure balance hole described above has a pore size range of 0.1 mm to 100 mm.

[9] The pressure balance hole may be a circular or non-circular through hole or a through hole. [10] The distribution of several pressure balance holes described above constitutes a hole net to adjust the pressure on both sides of the blade; the distribution, shape and size of the pressure balance hole are determined according to the size, shape, working environment and conditions of the blade.

 [11] Another object of the present invention is a fan blade for a centrifugal fan which can reduce the pressure difference between the front and the rear of the blade and eliminate the backflow caused by the separation of the boundary layer at the trailing edge.

 [12] The blade of a centrifugal fan of the present invention is completed by the following technical solution: a fan blade of a centrifugal fan, including a leading edge portion in the air inflow direction and a trailing edge portion in the air outflow direction, the trailing edge There are several pressure balance holes in the section.

 [13] Compared with the prior art, the advantages of the present invention are: designing a plurality of pressure balance holes at the trailing edge of the blade to play the role of self-balancing pressure, reducing the pressure difference between the front and the back of the blade, and eliminating the trailing edge portion. The reflow phenomenon caused by the separation of the boundary layer airflow increases the effective functional area of the blade, thereby potentially improving power consumption and noise quality, while avoiding the deposition of large amounts of dust.

 [14] The above several pressure balance holes may be array distributed, evenly distributed, or randomly distributed.

[15] The pressure balance hole described above has a pore size range of 0.1 mm to 100 mm.

 [16] The pressure balance hole may be a circular or non-circular through hole or a through hole.

 [17] The distribution of several pressure balance holes described above constitutes a hole net to adjust the pressure on both sides of the blade; the distribution, shape and size of the pressure balance hole depend on the size, shape, working environment and conditions of the blade. Country deletion

 [18] The present invention will be described in detail below with reference to the accompanying drawings:

[19] Figure 1 is a schematic view of the structure of a conventional axial fan

2 is a schematic structural view of an axial fan blade of the present invention;

Figure 3 is a schematic view showing the application of the axial flow fan of the present invention;

[22] FIG. 4 is a schematic structural view of a centrifugal fan of the present invention;

Figure 5 is a schematic view showing the structure of the centrifugal fan blade of the present invention.

[24] Embodiment 1: As shown in FIG. 2 and FIG. 3, the axial fan blade of the present invention includes a front edge portion 1 in an air inflow direction and a rear edge portion 2 in an air outflow direction, and a plurality of rear edge portions 2 are opened. Pressure balance hole 3

. The plurality of pressure balance holes 3 may be round holes, non-round holes, straight through holes or oblique through holes. Several pressure balances The distribution of the holes 3 constitutes a network of holes that regulate the pressure on both sides of the blade. Aperture range of pressure balance hole 3: 0.1mm - lOOmmo

 [25] It has been proved by experiments that there are several pressure balance holes 3 on the trailing edge part 2, which play the role of self-balancing pressure, reduce the pressure difference between the front and the back of the wind blade, and eliminate the boundary layer of the trailing edge part 2 on the windward side 4. The recirculation phenomenon caused by air separation increases the effective functional area of the blade, thereby potentially improving power consumption and noise quality, while avoiding the deposition of large amounts of dust and sanitation.

 [26] Embodiment 2: As shown in FIG. 4 and FIG. 5, the centrifugal fan blade of the present invention includes a front edge portion 1 in an air inflow direction and a rear edge portion 2 in an air outflow direction, and a plurality of rear edge portions 2 are opened. Pressure balance hole 3

 . The plurality of pressure balance holes 3 may be round holes, non-round holes, straight through holes or oblique through holes. The distribution of several pressure equalization holes 3 constitutes a network of holes to regulate the pressure on both sides of the blade. Pressure balance hole 3 aperture range: 0.1

[27] It has been proved by experiments that there are several pressure balance holes 3 on the trailing edge part 2, which play the role of self-balancing pressure, reduce the pressure difference between the front and the back of the wind blade, and eliminate the boundary layer of the trailing edge part 2 on the windward side 4. The recirculation phenomenon caused by air separation increases the effective functional area of the blade, thereby potentially improving power consumption and noise quality, while avoiding the deposition of large amounts of dust and sanitation.

Claims

Claim  [1] A fan blade of an axial flow fan, comprising a front edge portion (1) in an air inflow direction and a rear edge portion (2) in an air outflow direction, characterized in that: a plurality of rear edge portions (2) are opened Pressure balance hole (3) [2] The blade of an axial flow fan according to claim 1, characterized in that the distribution of the plurality of pressure balance holes (3) is distributed, uniformly distributed or randomly distributed in an array. [3] The blade of an axial flow fan according to claim 1 or 2, wherein the pressure equalization hole (3) is a through hole or an oblique through hole. [4] The blade of an axial flow fan according to claim 3, characterized in that: the distribution of the plurality of pressure balance holes (3) constitutes a hole net, and the pressure on both sides of the blade is adjusted. [5] The blade of an axial fan according to claim 3, wherein: the pressure balance hole (3)  The aperture range is: O.lmm-lOOmm; The pressure balance hole (3) is a round hole or a non-round hole. [6] A fan blade of a centrifugal fan, comprising a leading edge portion (1) in an air inflow direction and a trailing edge portion (2) in an air outflow direction, characterized in that: a plurality of pressures are formed on the trailing edge portion (2) Balance hole (3) [7] A blade of a centrifugal fan according to claim 6, characterized in that the distribution of the plurality of pressure equalization holes (3) is distributed, uniformly distributed or randomly distributed in an array. [8] A fan blade for a centrifugal fan according to claim 6 or 7, wherein: said pressure equalization hole (3) is a through hole or an oblique through hole. [9] A fan blade for a centrifugal fan according to claim 8, wherein: the distribution of the plurality of pressure balance holes (3) constitutes a mesh network for adjusting the pressure on both sides of the blade. [10] The blade of a centrifugal fan according to claim 8, wherein: the pressure balance hole (3)  The aperture range is: O.lmm-lOOmm; The pressure balance hole (3) is a round hole or a non-round hole.