A fan blade and a high-efficiency, low-noise axial flow fan including the fan blade

Abstract

The present invention discloses a fan blade and also discloses a high-efficiency and low-noise axial flow fan blade, wherein the fan blade includes a blade, the top edge, left edge, bottom edge and right edge of the blade are all circular arcs, the arc center of the bottom edge is taken as the origin, the horizontal extension line of the origin is the X-axis, the longitudinal extension line of the origin is the Y-axis, the horizontal distance from the arc center of the left edge to the Y-axis is X1, the longitudinal distance from the arc center of the left edge to the X-axis is Y1, the horizontal distance from the arc center of the top edge to the Y-axis is X2, the longitudinal distance from the arc center of the top edge to the X-axis is Y2, the horizontal distance from the arc center of the right edge to the Y-axis is X3, and the longitudinal distance from the arc center of the right edge to the X-axis is Y3. While ensuring the same air output, the present invention narrows the blade root area, reduces the weight of the blade, and reduces the torque of the assembled impeller, thereby obtaining a fan blade with better performance.

Description

Technical Field

[0001] The present invention relates to a fan, in particular to a fan blade and a high-efficiency and low-noise axial flow fan comprising the fan blade. Background Art

[0002] The performance of a fan depends on many factors, and the fan blades are one of the main factors affecting the fan's performance. Among them, the size and shape of the fan blades are particularly important, such as the shape and size of the blade tip and blade root. The fan blades are usually not flat when in use. They will first be swung to a certain angle and then bent. At this time, the swing angle of the fan blade is the compression angle, and the radius of the fan blade when compressed and bent is the bending radius. Existing fan blades have not been scientifically calculated and tested for these factors, resulting in low air volume and high energy consumption of the assembled fan. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a fan blade that can improve the efficiency of the existing fan blade when in use.

[0004] The present invention also provides a high-efficiency and low-noise axial flow fan having the above-mentioned fan blades.

[0005] The solution of the present invention to solve its technical problem is: a fan blade, comprising a blade, the top edge, left edge, bottom edge and right edge of the blade are all arcs, and chamfers are provided between the top edge and the left edge, the top edge and the right edge, the bottom edge and the left edge, and the bottom edge and the right edge. The arc center of the bottom edge is taken as the origin, the horizontal extension line of the origin is the X axis, the vertical extension line of the origin is the Y axis, the horizontal distance from the arc center of the left edge to the Y axis is X1, the vertical distance from the arc center of the left edge to the X axis is Y1, the horizontal distance from the arc center of the top edge to the Y axis is X2, and the vertical distance from the arc center of the top edge to the X axis is Y 2, the horizontal distance from the arc center of the right side to the Y axis is X3, the longitudinal distance from the arc center of the right side to the X axis is Y3, the ratio of X1 to X2 is 11 to 12, the ratio of X2 to X3 is 1.5 to 2, the ratio of Y1 to Y2 is 1.5 to 2, and the ratio of Y2 to Y3 is 0.3 to 0.5. The arc radius of the left side is R1, the arc radius of the top side is R2, the arc radius of the right side is R3, and the arc radius of the bottom side is R4. The ratio of R1 to R2 is 0.6-0.8, the ratio of R2 to R3 is 1.5-2, and the ratio of R3 to R4 is 0.6-0.8.

[0006] A fan blade according to an embodiment of the present invention has at least the following beneficial effects: when the blade is formed, it is processed and manufactured according to the size limit. First, the arc center of the bottom edge is used as the addition point, and an arc is made with a radius of R4. Then, the values ​​of X1 and Y1 are arbitrarily determined, and the arc center of the left side is determined, and an arc is made with a radius of R1. In the same way, the values ​​of X2 and Y2 are determined according to the ratio, and the arc center of the top edge is determined, and an arc is made with a radius of R2. The values ​​of X3 and Y3 are determined according to the ratio, and the arc center of the right side is determined, and an arc is made with a radius of R3. In this way, four arcs are made, and the intersection of two adjacent arcs is rounded. The intersection is the blade. Since the working capacity of the blade top area is stronger than that of the blade root area, the blade obtained according to this ratio narrows the blade root area while ensuring the same air output, reduces the weight of the blade, and reduces the torque of the assembled impeller, thereby obtaining a fan blade with better performance.

[0007] According to some embodiments of the present invention, the line connecting the two ends of the bottom edge is a transition line, the perpendicular bisector of the transition line is a forming line, any point on the forming line is a rotation point, the longitudinal extension line passing through the rotation point is a reference line, and the angle between the forming line and the reference line is 28 degrees to 32 degrees.

[0008] According to some embodiments of the present invention, the blade is bent in a direction perpendicular to the blade, and the bending radius of the blade is 305 mm to 315 mm.

[0009] According to some embodiments of the present invention, the angle between the pressing line and the reference line is 30 degrees.

[0010] According to some embodiments of the present invention, the bending radius of the blade is 310 mm.

[0011] According to some embodiments of the present invention, the ratio of X1 to X2 is 11.3, the ratio of X2 to X3 is 1.9, the ratio of Y1 to Y2 is 1.7, and the ratio of Y2 to Y3 is 0.3.

[0012] According to some embodiments of the present invention, the ratio of R1 to R2 is 0.7, the ratio of R2 to R3 is 1.9, and the ratio of R3 to R4 is 0.6.

[0013] According to the second aspect of the present invention, an efficient and low-noise axial flow fan includes a base plate and a drive motor. The drive motor is transmission-connected to the base plate, and a plurality of the above-mentioned fan blades are arranged in a circumferential array on the base plate.

[0014] According to an embodiment of the present invention, a high-efficiency, low-noise axial flow fan has at least the following beneficial effects: the fan blades obtained after optimizing the shape, pressure angle, and bending radius of the blades are then assembled into a fan, which greatly improves the air outlet efficiency, reduces the weight of the fan blades, and reduces energy consumption.

[0015] According to some embodiments of the present invention, four fan blades are provided on the base plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments. Obviously, the drawings described only illustrate some embodiments of the present invention, not all of them. Those skilled in the art can derive other design solutions and drawings based on these drawings without inventive effort.

[0017] Figure 1 is a top view of a blade of the present invention;

[0018] Figure 2 It is a front view of a blade of the present invention.

[0019] In the accompanying drawings: 1-leaf. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, all the connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connecting accessories according to the specific implementation situation. The various technical features in the invention can be combined interactively without conflicting with each other.

[0021] Reference Figure 1A fan blade comprises a blade 1, wherein the top edge, left edge, bottom edge and right edge of the blade 1 are all arcs, and chamfers are provided between the top edge and the left edge, the top edge and the right edge, the bottom edge and the left edge, and the bottom edge and the right edge. The arc center of the bottom edge is taken as the origin, the horizontal extension line of the origin is the X-axis, the vertical extension line of the origin is the Y-axis, the horizontal distance from the arc center of the left edge to the Y-axis is X1, the vertical distance from the arc center of the left edge to the X-axis is Y1, the horizontal distance from the arc center of the top edge to the Y-axis is X2, the vertical distance from the arc center of the top edge to the X-axis is Y2, and the right edge is The horizontal distance from the arc center to the Y axis is X3, the longitudinal distance from the arc center of the right side to the X axis is Y3, the ratio of X1 to X2 is 11 to 12, the ratio of X2 to X3 is 1.5 to 2, the ratio of Y1 to Y2 is 1.5 to 2, and the ratio of Y2 to Y3 is 0.3 to 0.5. The arc radius of the left side is R1, the arc radius of the top side is R2, the arc radius of the right side is R3, and the arc radius of the bottom side is R4. The ratio of R1 to R2 is 0.6-0.8, the ratio of R2 to R3 is 1.5-2, and the ratio of R3 to R4 is 0.6-0.8.

[0022] As can be seen from the above, when the blade 1 is formed, it is processed and manufactured according to the size limit. First, the arc center of the bottom edge is used as the added point, and an arc is made with a radius of R4. Then, the values ​​of X1 and Y1 are arbitrarily determined, and the arc center of the left side is determined, and an arc is made with a radius of R1. In the same way, the values ​​of X2 and Y2 are determined according to the ratio, and the arc center of the top edge is determined, and an arc is made with a radius of R2. The values ​​of X3 and Y3 are determined according to the ratio, and the arc center of the right side is determined, and an arc is made with a radius of R3. In this way, four arcs are made, and the intersection of two adjacent arcs is rounded. The intersection is the blade 1. Since the top area has stronger working capacity than the root area, the blade 1 obtained according to this ratio narrows the root area while ensuring the same air output, reduces the weight of the blade 1, and reduces the torque of the assembled impeller, thereby obtaining a fan blade with better performance.

[0023] In some embodiments, the line connecting the two ends of the bottom edge is a transition line, the perpendicular midline of the transition line is a forming line, any point on the forming line is a rotation point, and a longitudinal extension line passing through the rotation point is a reference line. The angle between the forming line and the reference line is 28 to 32 degrees. The angle formed by the forming line and the reference line is the forming angle. The forming angle is the angle at which the blade rotates as a whole when the blade is formed and bent. The forming angle has a significant impact on the final shape of the blade. Compared with traditional blades, the present invention increases the forming angle, resulting in a larger air volume and less vibration when the blade 1 is bent and rotated.

[0024] In some embodiments, the blade 1 is bent in a direction perpendicular to the blade 1, and the bending radius of the blade 1 is 305 mm to 315 mm. Compared with traditional wind blades, the present invention increases the bending radius, so that the blade 1 has a larger air volume and less vibration when rotating.

[0025] In some embodiments, the angle between the pressing line and the reference line is 30 degrees. The blade 1 is bent at this angle to achieve the best performance.

[0026] In some embodiments, the bending radius of the blade 1 is R5, and R5 is 310 mm. The blade 1 is bent at this angle to achieve the best performance.

[0027] In some embodiments, the ratio of X1 to X2 is 11.3, the ratio of X2 to X3 is 1.9, the ratio of Y1 to Y2 is 1.7, and the ratio of Y2 to Y3 is 0.3, which is the optimal structural design.

[0028] In some embodiments, the ratio of R1 to R2 is 0.7, the ratio of R2 to R3 is 1.9, and the ratio of R3 to R4 is 0.6, which is the optimal structural design.

[0029] The present invention also provides a high-efficiency, low-noise axial flow fan, comprising a base plate and a drive motor, wherein the drive motor is transmission-connected to the base plate, and a plurality of the above-mentioned fan blades are arranged in a circumferential array on the base plate.

[0030] The beneficial effects of this high-efficiency and low-noise axial flow fan are as follows: the fan blades obtained by optimizing the shape, pressure angle and bending radius of the blades 1 are then assembled into a fan, which greatly improves the air outlet efficiency, reduces the weight of the fan blades, and reduces energy consumption.

[0031] In some embodiments, four fan blades are provided on the base plate.

[0032] In order to further verify the working effect of the fan, the first set of experimental tests was conducted on the existing axial flow fan. It was connected to 8 types of air ducts to obtain 8 different working conditions. The experimental data are shown in Table 1:

[0033] Table 1:

[0034]

[0035] Taking X1 as 210 mm, the ratio of X1 to X2 as 11, the ratio of X2 to X3 as 1.5, the ratio of Y1 to Y2 as 1.5, the ratio of Y2 to Y3 as 0.3, R1 as 180 mm, the ratio of R1 to R2 as 0.6, the ratio of R2 to R3 as 1.5, and the ratio of R3 to R4 as 0.6, the axial flow fan assembled with the fan blade was connected to 8 air ducts for the second set of experimental tests, and 8 different working conditions were obtained. The experimental data are shown in Table 2:

[0036] Table 2:

[0037]

[0038]

[0039] Taking X1 as 210 mm, the ratio of X1 to X2 as 12, the ratio of X2 to X3 as 2, the ratio of Y1 to Y2 as 2, the ratio of Y2 to Y3 as 0.5, R1 as 180 mm, the ratio of R1 to R2 as 0.8, the ratio of R2 to R3 as 2, and the ratio of R3 to R4 as 0.8, the axial flow fan assembled with the fan blade was connected to 8 air ducts for the third set of experimental tests, and 8 different working conditions were obtained. The experimental data are shown in Table 3:

[0040] Table 3:

[0041]

[0042] Taking X1 as 210 mm, the ratio of X1 to X2 as 11.3, the ratio of X2 to X3 as 1.9, the ratio of Y1 to Y2 as 1.7, the ratio of Y2 to Y3 as 0.3, R1 as 180 mm, the ratio of R1 to R2 as 0.7, the ratio of R2 to R3 as 1.9, and the ratio of R3 to R4 as 0.6, the axial flow fan assembled with the fan blade was connected to 8 air ducts to conduct the fourth set of experimental tests, obtaining 8 different working conditions. The experimental data are shown in Table 4:

[0043] Table 4:

[0044]

[0045] It can be seen from Tables 1 to 4 above that, compared with traditional axial flow fans, the axial flow fan assembled using the fan blades of the present invention has a relatively improved axial static efficiency, and the impeller power and the A-sound level are relatively reduced. Therefore, the arc-shaped blade 1 is more efficient than the traditional straight plate blade 1. Under the same air output, the power consumption is lower and the noise is less. Comparing Tables 2 to 4, it can be seen that the fan blades processed and manufactured using the data ratio in the fourth test have the best performance of the assembled axial flow fan, and the root of the blade 1 cannot be infinitely reduced, which will affect the use intensity of the fan blade. Therefore, it can be seen from Table 4 that this is the optimal value of the structure.

[0046] While keeping X1 at 210 mm, the ratio of X1 to X2 at 11.3, the ratio of X2 to X3 at 1.9, the ratio of Y1 to Y2 at 1.7, the ratio of Y2 to Y3 at 0.3, R1 at 180 mm, the ratio of R1 to R2 at 0.7, the ratio of R2 to R3 at 1.9, and the ratio of R3 to R4 at 0.6, the compression angle of the fan blade during compression was changed to 29 degrees. An axial flow fan assembled with the fan blade was connected to 8 types of air ducts to conduct the fifth set of experimental tests, obtaining 8 different working conditions. The experimental data are shown in Table 5:

[0047] Table 5:

[0048]

[0049] While keeping X1 at 210 mm, the ratio of X1 to X2 at 11.3, the ratio of X2 to X3 at 1.9, the ratio of Y1 to Y2 at 1.7, the ratio of Y2 to Y3 at 0.3, R1 at 180 mm, the ratio of R1 to R2 at 0.7, the ratio of R2 to R3 at 1.9, and the ratio of R3 to R4 at 0.6, the compression angle of the fan blade during compression was changed to 30 degrees. An axial flow fan assembled with the fan blade was connected to 8 types of air ducts for the sixth set of experimental tests, obtaining 8 different working conditions. The experimental data are shown in Table 6:

[0050] Table 6:

[0051]

[0052]

[0053] While keeping X1 at 210 mm, the ratio of X1 to X2 at 11.3, the ratio of X2 to X3 at 1.9, the ratio of Y1 to Y2 at 1.7, the ratio of Y2 to Y3 at 0.3, R1 at 180 mm, the ratio of R1 to R2 at 0.7, the ratio of R2 to R3 at 1.9, and the ratio of R3 to R4 at 0.6, the compression angle of the fan blade during compression was changed to 31 degrees. An axial flow fan assembled with the fan blade was connected to 8 types of air ducts for the seventh set of experimental tests, obtaining 8 different working conditions. The experimental data are shown in Table 7:

[0054] Table 7:

[0055]

[0056] It can be seen from Tables 5 to 7 above that when the compression angle changes from 29 degrees to 30 degrees, the overall performance of the fan blade is improved, but when it changes from 30 degrees to 31 degrees, the overall performance of the fan blade decreases. Although the power can be reduced, the flow rate and total pressure are reduced, and the fan efficiency is not improved. Therefore, the compression angle of 30 degrees is the optimal value.

[0057] While keeping X1 at 210 mm, the ratio of X1 to X2 at 11.3, the ratio of X2 to X3 at 1.9, the ratio of Y1 to Y2 at 1.7, the ratio of Y2 to Y3 at 0.3, R1 at 180 mm, the ratio of R1 to R2 at 0.7, the ratio of R2 to R3 at 1.9, the ratio of R3 to R4 at 0.6, the pressing angle at 30 degrees, and changing the bending radius of the fan blade during pressing to 305, an axial flow fan assembled with the fan blade was connected to 8 types of air ducts to conduct the eighth set of experimental tests, obtaining 8 different working conditions. The experimental data are shown in Table 8:

[0058] Table 8:

[0059]

[0060] While keeping X1 at 210 mm, the ratio of X1 to X2 at 11.3, the ratio of X2 to X3 at 1.9, the ratio of Y1 to Y2 at 1.7, the ratio of Y2 to Y3 at 0.3, R1 at 180 mm, the ratio of R1 to R2 at 0.7, the ratio of R2 to R3 at 1.9, the ratio of R3 to R4 at 0.6, the pressing angle at 30 degrees, and changing the bending radius of the fan blade during pressing to 310 degrees, an axial flow fan assembled with the fan blade was connected to 8 types of air ducts to conduct the ninth set of experimental tests, obtaining 8 different working conditions. The experimental data are shown in Table 9:

[0061] Table 9:

[0062]

[0063] While keeping X1 at 210 mm, the ratio of X1 to X2 at 11.3, the ratio of X2 to X3 at 1.9, the ratio of Y1 to Y2 at 1.7, the ratio of Y2 to Y3 at 0.3, R1 at 180 mm, the ratio of R1 to R2 at 0.7, the ratio of R2 to R3 at 1.9, the ratio of R3 to R4 at 0.6, the pressing angle at 30 degrees, and changing the bending radius of the fan blade during pressing to 315 degrees, an axial flow fan assembled with the fan blade was connected to 8 types of air ducts, and the tenth set of experimental tests was carried out to obtain 8 different working conditions. The experimental data are shown in Table 10:

[0064] Table 10:

[0065]

[0066] It can be seen from Tables 8-10 above that although the air output of the axial flow fan increases with the increase of the bending angle during the bending process, when it increases to 315 mm, the fan efficiency decreases instead, and the sound level increases compared to A. The noise generated during operation is constantly increasing. Therefore, a bending radius of 310 mm is more efficient and low-noise, which is the optimal value for the structure.

[0067] In summary, combined with the ten groups of experimental tests, the performance of the axial flow fan assembled by the fan blades can be affected by changing the size, pressure angle, and bending radius of the blade 1. Since the working capacity of the top area of ​​the blade 1 is stronger than that of the root area, further reducing the root of the trailing edge can reduce the weight of the blade 1 and reduce the impeller torque, but it cannot be reduced indefinitely, which will affect the connection strength of the fan blade and also cause performance to deteriorate. When the ratio of X1 to X2 is 11.3, the ratio of X2 to X3 is 1.9, the ratio of Y1 to Y2 is 1.7, the ratio of Y2 to Y3 is 0.3, the ratio of R1 to R2 is 0.7, the ratio of R2 to R3 is 1.9, the ratio of R3 to R4 is 0.6, the pressure angle is 30 degrees, and the bending radius is 310, the performance of the axial flow fan assembled by this fan blade is optimal, with high air output, lower energy consumption, and lower noise.

[0068] The above specifically describes the preferred embodiments of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A fan blade, characterized in that: The blade (1) comprises a top edge, a left edge, a bottom edge and a right edge of the blade (1), all of which are arcs; a chamfer is provided between the top edge and the left edge, the top edge and the right edge, the bottom edge and the left edge, and the bottom edge and the right edge; the arc center of the bottom edge is taken as the origin; the horizontal extension line of the origin is the X axis; the vertical extension line of the origin is the Y axis; the horizontal distance from the arc center of the left edge to the Y axis is X1; the vertical distance from the arc center of the left edge to the X axis is Y1; the horizontal distance from the arc center of the top edge to the Y axis is X2; the vertical distance from the arc center of the top edge to the X axis is The horizontal distance from the arc center of the right side to the Y axis is X3, the vertical distance from the arc center of the right side to the X axis is Y3, the arc radius of the left side is R1, the arc radius of the top side is R2, the arc radius of the right side is R3, the arc radius of the bottom side is R4, the ratio of X1 to X2 is 11.3, the ratio of X2 to X3 is 1.9, the ratio of Y1 to Y2 is 1.7, the ratio of Y2 to Y3 is 0.3, the ratio of R1 to R2 is 0.7, the ratio of R2 to R3 is 1.9, and the ratio of R3 to R4 is 0.

6.

2. A fan blade according to claim 1, characterized in that: The line connecting the two ends of the bottom edge is the transition line, the perpendicular midline of the transition line is the pressing line, any point on the pressing line is the rotation point, the longitudinal extension line passing through the rotation point is the reference line, and the angle between the pressing line and the reference line is 28 degrees to 32 degrees.

3. A fan blade according to claim 2, characterized in that: The blade (1) is bent in a direction perpendicular to the blade (1), and the bending radius of the blade (1) is 305 mm to 315 mm.

4. The fan blade according to claim 2, characterized in that: The angle between the pressing line and the reference line is 30 degrees.

5. The fan blade according to claim 3, characterized in that: The bending radius of the blade (1) is 310 mm.

6. A high-efficiency, low-noise axial flow fan, characterized by: The invention comprises a base plate and a driving motor, wherein the driving motor is in driving connection with the base plate, and a plurality of fan blades according to any one of claims 1 to 5 are arranged in a circular array on the base plate.

7. The high-efficiency, low-noise axial flow fan according to claim 6, characterized in that: Four fan blades are arranged on the base plate.

Images