CN219139456U - Centrifugal fan blade, centrifugal fan and air conditioner - Google Patents

Centrifugal fan blade, centrifugal fan and air conditioner Download PDF

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Publication number
CN219139456U
CN219139456U CN202223261454.3U CN202223261454U CN219139456U CN 219139456 U CN219139456 U CN 219139456U CN 202223261454 U CN202223261454 U CN 202223261454U CN 219139456 U CN219139456 U CN 219139456U
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fan blade
equal
centrifugal fan
tangent line
blade
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卢奇
谢开元
何阿龙
陈科
杨涛
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E10/72—Wind turbines with rotation axis in wind direction

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Abstract

The utility model provides a centrifugal fan blade, a centrifugal fan and an air conditioner. Wherein, centrifugal fan blade includes: the body comprises a top plate, a bottom plate and a hub, wherein the hub is arranged on the bottom plate, the fan blades are arranged between the top plate and the bottom plate which are oppositely arranged, the front edge vertexes of the fan blades are on a first preset circle, and the rear edge vertexes of the fan blades are on a second preset circle; the leading edge vertex which is positioned on the middle arc line of the blade profile of the fan blade is used as a first tangent line, the leading edge vertex which is positioned on a first preset circle is used as a second tangent line, and a blade profile inlet angle alpha of the fan blade is formed between the first tangent line and the second tangent line, wherein alpha meets the following conditions: alpha is more than or equal to 8 degrees and less than or equal to 14 degrees; and a third tangent line is arranged at the trailing edge vertex positioned on the middle arc line of the blade profile of the fan blade, a fourth tangent line is arranged at the trailing edge vertex positioned on the second preset circle, and an outlet angle beta of the fan blade is formed between the third tangent line and the fourth tangent line, wherein beta meets the following conditions: beta is more than or equal to 41 degrees and less than or equal to 47 degrees. The utility model effectively solves the problem of lower air supply efficiency of the centrifugal fan in the prior art.

Description

Centrifugal fan blade, centrifugal fan and air conditioner
Technical Field
The utility model relates to the technical field of centrifugal fans, in particular to a centrifugal fan blade, a centrifugal fan and an air conditioner.
Background
At present, the centrifugal fan has the characteristics of large wind pressure, small flow, capability of changing the direction of air flow and the like, and is most widely applied to household appliances. The fan blade is a core component of the centrifugal fan, and the performance of the fan blade has direct influence on the performance of the whole machine and has quite deep influence on the most visual noise felt by consumers.
However, in the prior art, the blade profile of the backward centrifugal fan blade of the centrifugal fan affects the air supply efficiency and the operation noise of the centrifugal fan, so that the centrifugal fan cannot meet the use requirement of a user.
Disclosure of Invention
The utility model mainly aims to provide a centrifugal fan blade, a centrifugal fan and an air conditioner, so as to solve the problems of low air supply efficiency and high running noise of the centrifugal fan in the prior art.
In order to achieve the above object, according to one aspect of the present utility model, there is provided a centrifugal fan blade comprising: the body comprises a top plate, a bottom plate and a hub, wherein the hub is arranged on the bottom plate, and the top plate and the bottom plate are arranged oppositely; the fan blade is arranged between the top plate and the bottom plate, the top point of the front edge of the fan blade is on a first preset circle, the top point of the rear edge of the fan blade is on a second preset circle, and the first preset circle is positioned on the inner side of the second preset circle; the leading edge vertex which is positioned on the middle arc line of the blade profile of the fan blade is used as a first tangent line, the leading edge vertex which is positioned on a first preset circle is used as a second tangent line, a blade profile inlet angle alpha of the fan blade is formed between the first tangent line and the second tangent line, and the blade profile inlet angle alpha meets the following conditions: alpha is more than or equal to 8 degrees and less than or equal to 14 degrees; and a third tangent line is arranged at the trailing edge vertex positioned on the middle arc line of the blade profile of the fan blade, a fourth tangent line is arranged at the trailing edge vertex positioned on the second preset circle, and an outlet angle beta of the fan blade is formed between the third tangent line and the fourth tangent line, wherein the outlet angle beta meets the following conditions: beta is more than or equal to 41 degrees and less than or equal to 47 degrees.
Further, the blade profile inlet angle alpha is 10 degrees, and the outlet angle beta is 43 degrees or 45 degrees.
Further, the arc length radius R of the camber line of the blade profile satisfies: r is more than or equal to 1000mm and less than or equal to 1050mm.
Further, the camber line of the blade profile is a section of a fourth-order Bezier curve defined by five control points.
Further, the five control points comprise a P1 point, a P2 point, a P3 point, a P4 point and a P5 point; the coordinates (X1, Y1) of the P1 point satisfy: x1=0, y1=0; the coordinates (X2, Y2) of the P2 point satisfy: x2 is more than or equal to 0.17 and less than or equal to 0.22C, Y2 is more than or equal to 2.5mm and less than or equal to 3.3mm; the coordinates (X3, Y3) of the P3 point satisfy: x3 is more than or equal to 0.42 and less than or equal to 0.50C, Y3 is more than or equal to 3.3mm and less than or equal to 3.8mm; the coordinates (X4, Y4) of the P4 point satisfy: x4 is more than or equal to 0.71 and less than or equal to 0.78C, Y4 is more than or equal to 1.1mm and less than or equal to 1.6mm; the coordinates (X5, Y5) of the P5 point satisfy: x4=c, y5=0; wherein, C is the chord length of the blade profile of the fan blade.
Further, the thickness distribution function of the fan blade is as follows; y=a·x+b·x 2 +C·x 3 +D·x 4 +E·x 5 +F·x 6 +g; wherein, along the chord length direction of the fan blade, y is the thickness of different positions on the fan blade, A is more than or equal to 1.78 and less than or equal to 1.99, B is more than or equal to-0.073,0.0013 and less than or equal to-0.073,0.0013, C is more than or equal to-0.0016, and 1.58 multiplied by 10 -5 ≤D≤-1.13×10 -5 ，5.01×10 -8 ≤E≤7.60×10 -8 ，-1.446×10 -11 ≤F≤0.8681×10 -11 ，0.43≤G≤1.40。
Further, the bottom plate is a circular plate, the diameter of the second preset circle is consistent with the outer diameter of the circular plate, and the circular plate and the second preset circle are coaxially arranged.
Further, the centrifugal fan blade further comprises: the reinforcing rib is arranged between the bottom plate and the fan blade and surrounds the outer circumferential surface of the fan blade.
Further, the cross-sectional area of the fan blade is uniform along the direction from the upper edge to the lower edge of the fan blade.
Further, the rear edge of the fan blade is provided with a notch.
According to another aspect of the utility model, a centrifugal fan is provided, comprising the centrifugal fan blade.
According to another aspect of the present utility model, there is provided an air conditioner including the centrifugal fan blade described above.
By applying the technical scheme of the utility model, the centrifugal fan blade comprises a body and a fan blade, wherein the body comprises a top plate, a bottom plate and a hub, the hub is arranged on the bottom plate, the top plate and the bottom plate are oppositely arranged, the fan blade is arranged between the top plate and the bottom plate, the top point of the front edge of the fan blade is on a first preset circle, the top point of the rear edge of the fan blade is on a second preset circle, and the first preset circle is positioned on the inner side of the second preset circle. In this way, a first tangent line is taken as a front edge vertex positioned on an arc line in the blade profile of the fan blade, a second tangent line is taken as a front edge vertex positioned on a first preset circle, a blade profile inlet angle alpha of the fan blade is formed between the first tangent line and the second tangent line, and the blade profile inlet angle alpha meets the following conditions: alpha is more than or equal to 8 degrees and less than or equal to 14 degrees; and a third tangent line is arranged at the trailing edge vertex positioned on the middle arc line of the blade profile of the fan blade, a fourth tangent line is arranged at the trailing edge vertex positioned on the second preset circle, and an outlet angle beta of the fan blade is formed between the third tangent line and the fourth tangent line, wherein the outlet angle beta meets the following conditions: 41 DEG is less than or equal to 47 DEG, the camber line of the blade is constructed through the blade profile inlet angle alpha and the outlet angle beta of specific parameters, so that the flow loss of air flow in the blade is reduced by reasonably designing the blade profile of the blade, the air flow of the centrifugal blade at the same rotating speed is increased, the air supply efficiency of the centrifugal blade is further improved, the noise generated in the running process of the blade can be reduced, the problems of lower air supply efficiency and larger running noise of the centrifugal fan in the prior art are solved, and the use experience of a user is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
fig. 1 shows a schematic perspective view of an embodiment of a centrifugal fan blade according to the utility model;
FIG. 2 shows a side view of the centrifugal fan blade of FIG. 1;
FIG. 3 shows a schematic cross-sectional view of the centrifugal fan blade of FIG. 2 in the A-A direction;
FIG. 4 is a schematic perspective view of the centrifugal fan blade in FIG. 3;
FIG. 5 shows a side view of the centrifugal fan blade of FIG. 1;
FIG. 6 shows a schematic cross-sectional view in the B-B direction of the centrifugal fan blade of FIG. 5;
fig. 7 is a schematic diagram showing the overall structure of a first preset circle, a second preset circle and a camber line of the blade of the centrifugal blade in fig. 1;
FIG. 8 shows a schematic overall structure of a camber line of the blade profile of FIG. 7;
FIG. 9 is a graph showing a comparison of blade performance of the centrifugal blade of FIG. 1 at different power for different profile outlet angles of the blade;
fig. 10 shows a noise comparison of the centrifugal fan blade of fig. 1 with a conventional fan blade.
Wherein the above figures include the following reference numerals:
10. a top plate; 20. a bottom plate; 30. a hub; 40. a fan blade; 41. a first preset circle; 42. a second preset circle; 43. a camber line of the leaf profile.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.
It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise indicated.
In the present utility model, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used generally with respect to the orientation shown in the drawings or to the vertical, vertical or gravitational orientation; also, for ease of understanding and description, "left, right" is generally directed to the left, right as shown in the drawings; "inner and outer" refer to inner and outer relative to the outline of the components themselves, but the above-described orientation terms are not intended to limit the present utility model.
In order to solve the lower and great problem of running noise of air supply efficiency of centrifugal fan among the prior art, this application provides a centrifugal fan blade, centrifugal fan and air conditioner.
As shown in fig. 1 to 8, the centrifugal fan blade includes a body and a fan blade 40, the body includes a top plate 10, a bottom plate 20 and a hub 30, the hub 30 is disposed on the bottom plate 20, and the top plate 10 is disposed opposite to the bottom plate 20. The fan blade 40 is disposed between the top plate 10 and the bottom plate 20, a front edge vertex of the fan blade 40 is on a first preset circle 41, a rear edge vertex of the fan blade 40 is on a second preset circle 42, and the first preset circle 41 is located inside the second preset circle 42. Wherein, the leading edge vertex on the profile camber line 43 of the fan blade 40 is used as a first tangent line, the leading edge vertex on the first preset circle 41 is used as a second tangent line, and a profile inlet angle alpha of the fan blade 40 is formed between the first tangent line and the second tangent line, and the profile inlet angle alpha satisfies: alpha is more than or equal to 8 degrees and less than or equal to 14 degrees; the third tangent line is taken by the trailing edge vertex on the blade profile camber line 43 of the fan blade 40, the fourth tangent line is taken by the trailing edge vertex on the second preset circle 42, and an outlet angle beta of the fan blade 40 is formed between the third tangent line and the fourth tangent line, wherein the outlet angle beta meets the following conditions: beta is more than or equal to 41 degrees and less than or equal to 47 degrees.
By applying the technical scheme of the embodiment, the centrifugal fan blade comprises a body and a fan blade 40, wherein the body comprises a top plate 10, a bottom plate 20 and a hub 30, the hub 30 is arranged on the bottom plate 20, the top plate 10 and the bottom plate 20 are oppositely arranged, the fan blade 40 is arranged between the top plate 10 and the bottom plate 20, the top point of the front edge of the fan blade 40 is arranged on a first preset circle 41, the top point of the rear edge of the fan blade 40 is arranged on a second preset circle 42, and the first preset circle 41 is positioned on the inner side of the second preset circle 42. In this way, the leading edge vertex located on the profile camber line 43 of the fan blade 40 is used as a first tangent line, the leading edge vertex located on the first preset circle 41 is used as a second tangent line, and a profile inlet angle alpha of the fan blade 40 is formed between the first tangent line and the second tangent line, and the profile inlet angle alpha meets the following conditions: alpha is more than or equal to 8 degrees and less than or equal to 14 degrees; the third tangent line is taken as the trailing edge vertex positioned on the blade profile camber line 43 of the fan blade, the fourth tangent line is taken as the trailing edge vertex positioned on the second preset circle 42, and an outlet angle beta of the fan blade 40 is formed between the third tangent line and the fourth tangent line, wherein the outlet angle beta meets the following conditions: 41 DEG is less than or equal to 47 DEG, and the blade camber line is constructed through the blade profile inlet angle alpha and the outlet angle beta of specific parameters, so that the blade profile of the fan blade 40 is reasonably designed, the flow loss of air flow in the fan blade 40 can be reduced, the air flow rate of the centrifugal fan blade at the same rotating speed is increased, the air supply efficiency of the centrifugal fan blade is further improved, the noise generated in the operation process of the fan blade 40 can be reduced, the problems that the air supply efficiency of the centrifugal fan is lower and the operation noise is higher in the prior art are solved, and the use experience of a user is improved.
In this embodiment, the profile of the fan blade 40 is obtained by adopting the method of the profile camber line 43 and the thickness distribution function together, so as to improve the airflow obstruction in the airflow channel, reduce the aerodynamic loss, and further improve the air supply efficiency of the centrifugal fan blade.
Specifically, the specific size and shape of the camber line 43 are first determined, and then the thickness values of the respective positions of the fan blade 40 are determined to determine the specific blade profile of the fan blade 40.
In this embodiment, the number of the fan blades 40 is 7, and an air flow channel is formed between each two adjacent fan blades 40 and the top plate 10 and the bottom plate 20, so that the fan blades 40 rotate to drive the air flow in the air flow channel to flow, thereby realizing the air supply function of the centrifugal fan blade.
It should be noted that the number of the fan blades 40 is not limited thereto, and can be adjusted according to the working condition and the use requirement. Alternatively, the fan blades 40 are two, or three, or four, or five, or six, or eight, or more.
Alternatively, the airfoil inlet angle alpha is 10 and the outlet angle beta is 43 or 45. In this way, the specific shape of the camber line 43 can be determined through the above-mentioned arrangement of the blade inlet angle alpha and the outlet angle beta, and then the blade profile of the fan blade 40 is determined, so as to reduce the flow loss of the air flow flowing through the fan blade 40, that is, reduce the air flow loss in the process of flowing in from the blade inlet angle alpha and flowing out from the outlet angle beta, increase the air flow of the fan blade 40 under the same rotation speed, and further improve the air supply efficiency of the centrifugal blade.
In this embodiment, the inlet angle alpha of the blade profile is 10 °, and the outlet angle beta is 45 °, so as to determine the shape of the camber line 43, so as to optimize the air supply efficiency of the fan blade 40.
Specifically, when the blade profile inlet angle alpha is 10 ° and the outlet angle beta satisfies: when 41 degrees are more than or equal to beta and less than or equal to 47 degrees, the shaft power, the air quantity/effective power and the air quantity/shaft power change degree are smaller, and the full-pressure effective power change range is larger. When the outlet angle beta is 45 degrees, the full-pressure effective power (blade performance) is the maximum value, and the air supply efficiency of the centrifugal blade is optimal.
It should be noted that the value of the blade inlet angle alpha is not limited to this, and can be adjusted according to the working condition and the use requirement. Optionally, the angle of the blade profile inlet angle alpha is 8 °, or 9 °, or 11 °, or 12 °, or 13 °, or 14 °.
It should be noted that the value of the outlet angle beta is not limited to this, and can be adjusted according to the working condition and the use requirement. Optionally, the angle of the outlet angle beta is 41 °, or 42 °, or 43 °, or 44 °, or 46 °, or 47 °.
Optionally, the arc length radius R of the airfoil mean camber line 43 satisfies: r is more than or equal to 1000mm and less than or equal to 1050mm. In this way, the specific shape of the camber line 43 can be determined by the above-mentioned arrangement of the camber line radius R of the camber line 43, so as to reduce the air flow loss of the air flow in the process of flowing through the fan blade 40, increase the air flow of the fan blade 40 at the same rotation speed, and further improve the air supply efficiency of the centrifugal blade. Meanwhile, the size of the camber line 43 of the blade profile can be matched with the air quantity, so that the operation efficiency of the centrifugal fan blade is improved.
In this embodiment, the arc length radius R of the airfoil mean camber line 43 is 1022mm, so that on one hand, the shape of the airfoil mean camber line 43 can be determined to optimize the air supply efficiency of the fan blade 40; on the other hand, the matching degree of the fan blade 40 and the air quantity is optimized, so that the use reliability of the centrifugal fan blade is improved.
It should be noted that, the value of the arc length radius R of the airfoil mean camber line 43 is not limited thereto, and may be adjusted according to the working condition and the use requirement. Optionally, the arc length radius R of the airfoil mean camber line 43 has a length of 1000mm, or 1010mm, or 1020mm, or 1030mm, or 1040mm, or 1050mm.
In this embodiment, the airfoil mean camber line 43 is a segment of a fourth-order Bezier curve defined by five control points. In this way, the specific shape of the camber line 43 is determined by the Bezier curve, so that the fan blade 40 has the advantages of the inlet angle alpha, the outlet angle beta and the arc length radius R of the blade under specific parameters, so as to further improve the air supply efficiency of the centrifugal fan blade.
Specifically, five structural parameters including a blade profile inlet angle alpha, an outlet angle beta, an arc length radius R of a blade profile camber line 43, a chord length C of the fan blade 40, and a maximum distance from the blade profile camber line 43 to the chord length C are set to ensure that the fan blade 40 can reduce the loss of airflow flowing through the fan blade 40, and then five control points are used for drawing a Bezier curve.
Optionally, firstly, a blade parameterization design flow is completed through a Matlab platform compiler, namely five structural parameters including a blade profile inlet angle alpha, an outlet angle beta, an arc length radius R of a blade profile camber line 43, a chord length C of a fan blade 40 and a maximum distance from the blade profile camber line 43 to the chord length C are obtained, and then five control points are selected to draw a Bezier curve through a de Castel jau recursion algorithm.
In the present embodiment, the five control points include a P1 point, a P2 point, a P3 point, a P4 point, and a P5 point. The coordinates (X1, Y1) of the P1 point satisfy: x1=0, y1=0. The coordinates (X2, Y2) of the P2 point satisfy: x2 is more than or equal to 0.17 and less than or equal to 0.22C, Y2 is more than or equal to 2.5mm and less than or equal to 3.3mm. The coordinates (X3, Y3) of the P3 point satisfy: x3 is more than or equal to 0.42 and less than or equal to 0.50C, Y3 is more than or equal to 3.3mm and less than or equal to 3.8mm. The coordinates (X4, Y4) of the P4 point satisfy: x4 is more than or equal to 0.71 and less than or equal to 0.78C, Y4 is more than or equal to 1.1mm and less than or equal to 1.6mm. The coordinates (X5, Y5) of the P5 point satisfy: x4=c, y5=0. Wherein C is the chord length of the blade profile of the fan blade 40. In this way, through the above arrangement of the P1 point, the P2 point, the P3 point, the P4 point and the P5 point, a section of fourth-order Bezier curve defined at five control points can be obtained, so that the specific shape of the leaf-shaped camber line 43 can be obtained, and the subsequent structural design can be conveniently carried out. The coordinate ranges of the five control points are as follows:
table 1 table of ranges of coordinates of control points
X 0 [17％,22％]C [42％,50％]C [71％,78％]C 100％C
Optimum value of X 0 20％C 48％C 73.3％C 100％C
Y 0 [2.5,3.3] [3.3,3.8] [1.1,1.6] 0
Y optimum value 0 3mm 3.5mm 1.3mm 0
In the present embodiment, the coordinates (X1, Y1) of the P1 point satisfy: x1=0, y1=0. The coordinates (X2, Y2) of the P2 point satisfy: x2=0.2c, y2=3 mm. The coordinates (X3, Y3) of the P3 point satisfy: x3=0.48 c, y3=3.5 mm. The coordinates (X4, Y4) of the P4 point satisfy: x4=0.7333 c, y4=1.3 mm. The coordinates (X5, Y5) of the P5 point satisfy: x4=c, y5=0. Thus, the specific shape of the camber line 43 of the blade profile can be accurately obtained through the fourth-order Bezier curve, so that the loss of the airflow when the airflow passes through the fan blade 40 is reduced, and the air supply efficiency of the centrifugal fan blade is improved.
Specifically, the Bezier curve is drawn through five preset structural parameters including the inlet angle alpha, the outlet angle beta, the arc length radius R of the camber line 43, the chord length C of the fan blade 40, the maximum distance from the camber line 43 to the chord length C, and five control points P1 to P5, so that the specific shape of the camber line 43 can be accurately obtained.
It should be noted that the value of the abscissa X2 of the point P2 is not limited to this, and may be adjusted according to the working condition and the use requirement. Alternatively, the abscissa X2 of the P2 point has a value of 0.17C, or 0.18C, or 0.19C, or 0.21C, or 0.22C.
It should be noted that, the value of the ordinate Y2 of the P2 point is not limited to this, and may be adjusted according to the working condition and the use requirement. Alternatively, the ordinate Y2 of the P2 point has a value of 2.5mm, or 2.7mm, or 2.9mm, or 3.1mm, or 3.3mm.
It should be noted that, the value of the abscissa X3 of the point P3 is not limited to this, and may be adjusted according to the working condition and the use requirement. Alternatively, the abscissa X3 of the P3 point has a value of 0.42C, or 0.44C, or 0.46C, or 0.50C.
It should be noted that, the value of the ordinate Y3 of the point P3 is not limited to this, and may be adjusted according to the working condition and the use requirement. Alternatively, the ordinate Y3 of the P3 point has a value of 3.3mm, or 3.4mm, or 3.6mm, or 3.7mm, or 3.8mm.
It should be noted that the value of the abscissa X4 of the point P4 is not limited to this, and may be adjusted according to the working condition and the use requirement. Alternatively, the abscissa X4 of the P4 point has a value of 0.71C, or 0.73C, or 0.75C, or 0.77C, or 0.78C.
It should be noted that, the value of the ordinate Y4 of the point P4 is not limited to this, and may be adjusted according to the working condition and the use requirement. Alternatively, the ordinate Y4 of the P4 point has a value of 1.1mm, or 1.2mm, or 1.4mm, or 1.5mm, or 1.6mm.
In the present embodiment, the thickness distribution function of the fan blade 40 is; y=a·x+b·x 2 +C·x 3 +D·x 4 +E·x 5 +F·x 6 +G. Wherein, along the chord length direction of the fan blade 40, y is the thickness of the fan blade 40 at different positions, A is more than or equal to 1.78 and less than or equal to 1.99, B is more than or equal to-086 and less than or equal to-0.073,0.0013, C is more than or equal to-0.0016, and 1.58 multiplied by 10 -5 ≤D≤-1.13×10 -5 ，5.01×10 -8 ≤E≤7.60×10 -8 ，-1.446×10 -11 ≤F≤0.8681×10 -1 1,0.43G is less than or equal to 1.40. In this way, the thickness distribution function of the fan blade 40 can calculate the thickness of the fan blade 40 at different positions along the chord length direction thereof, so as to confirm the overall structure of the fan blade 40. Wherein, the value range of each coefficient is as follows:
table 2 table of the range of values of each coefficient
Coefficients of Value range Optimum value
A [1.78,1.99] 1.88
B [-0.086,-0.073] -0.080
C [0.0013,0.0016] 0.00146
D [-1.58,-1.13]×10 -5 -1.35×10- 5
E [5.01,7.60]×10 -8 6.31×10 -8
F [-1.446,0.8681]×10 -11 -1.16×10 -11
G [0.43,1.40] 0.92
In this example, A had a value of 1.88, B had a value of-0.080, C had a value of 0.00146, and D had a value of-1.35X10 -5 E has a value of 6.31X10 -8 F has a value of-1.16X10 -11 G has a value of 0.92. Therefore, the thickness of the fan blade 40 is more suitable through the above values of the coefficients, so that on one hand, the loss of the air flow in the process of flowing through the fan blade 40 can be reduced, and the air supply efficiency of the centrifugal fan blade is improved; on the other hand, the structural strength of the fan blade 40 can be improved, so that the fan blade 40 is prevented from being damaged in the running process, and the service life of the centrifugal fan blade is prolonged.
As shown in fig. 1 to 8, the bottom plate 20 is a circular plate, the diameter of the second preset circle 42 is identical to the outer diameter of the circular plate, and the circular plate is coaxially disposed with the second preset circle 42. In this way, the projection of the fan blade 40 on the circular plate is ensured in the circular plate, the fan blade 40 is always arranged between the top plate 10 and the bottom plate 20, the fan blade 40 is prevented from protruding out of the bottom plate 20 on the premise of increasing the whole volume of the fan blade 40, and the air supply efficiency of the centrifugal fan blade is further improved.
In this embodiment, the centrifugal fan blade further includes a reinforcing rib disposed between the bottom plate 20 and the fan blade 40 and surrounding the outer peripheral surface of the fan blade 40. Like this, consolidate the connection between bottom plate 20 and the fan blade 40 through the strengthening rib to promote the joint strength of two, and then promoted the life of centrifugal fan blade. Meanwhile, the reinforcing ribs can not influence the air flow between the adjacent fan blades 40, so that the air supply efficiency of the centrifugal fan blades is improved.
As shown in fig. 1 to 8, the cross-sectional area of the fan blade 40 is uniform along the direction from the upper edge to the lower edge of the fan blade 40. Therefore, the above arrangement of the fan blade 40 makes the air flow smoothly and rapidly flow along the outer surface of the fan blade 40, so as to reduce the loss of the air flow flowing through the fan blade 40, and further improve the air supply efficiency of the centrifugal fan. Meanwhile, the upper arrangement makes the structure of the fan blade 40 simpler, easy to process and realize, and further reduces the processing difficulty of staff.
Specifically, the direction from the upper edge to the lower edge of the fan blade 40 is a preset direction, the preset direction and the cross section of the fan blade 40 are mutually perpendicular, and the cross section of the fan blade 40 is equal everywhere along the preset direction, so that the structure of the fan blade 40 is simpler, the processing and implementation are easy, and the processing cost of the centrifugal fan blade is reduced.
It should be noted that, the upper edge of the fan 40 refers to the surface of the fan 40 connected to the top plate 10, and the lower edge of the fan 40 refers to the surface of the fan 40 connected to the bottom plate 20.
Optionally, the rear edge of the fan blade is provided with a notch. Therefore, the arrangement of the notch can solve the noise problem caused by the vortex at the tail edge of the fan blade, and the notch has the effects of rectifying and reducing noise and optimizes noise. Meanwhile, the shape of the notch meets a quadratic function so as to eliminate the tail edge vortex of the fan blade.
Specifically, the notch is used for improving low-pressure vortex formed by uneven air outlet at the tail of the fan blade, and introducing upstream blade fluid into the tail of the downstream blade through the notch to fill a low-pressure area of the downstream blade, so that wake vortex is prevented from being formed. The notch is positioned at the upper part of the tail edge of the fan blade.
As shown in fig. 9, the centrifugal fan blade in this embodiment makes the fan blade 40 have higher full-pressure effective power through a specific outlet angle beta, so as to improve the air supply efficiency of the centrifugal fan blade.
As shown in fig. 10, the centrifugal fan blade in this embodiment has lower operation noise, and compared with the fan blade in the prior art, the operation noise is reduced by about 4.21% under the same air supply volume, thereby improving the use experience of users.
The application also provides a centrifugal fan (not shown), which comprises the centrifugal fan blade.
The application also provides an air conditioner (not shown), which comprises the centrifugal fan blade.
From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:
the centrifugal fan blade comprises a body and a fan blade, wherein the body comprises a top plate, a bottom plate and a hub, the hub is arranged on the bottom plate, the top plate and the bottom plate are arranged oppositely, the fan blade is arranged between the top plate and the bottom plate, the top point of the front edge of the fan blade is on a first preset circle, the top point of the rear edge of the fan blade is on a second preset circle, and the first preset circle is located on the inner side of the second preset circle. In this way, a first tangent line is taken as a front edge vertex positioned on an arc line in the blade profile of the fan blade, a second tangent line is taken as a front edge vertex positioned on a first preset circle, a blade profile inlet angle alpha of the fan blade is formed between the first tangent line and the second tangent line, and the blade profile inlet angle alpha meets the following conditions: alpha is more than or equal to 8 degrees and less than or equal to 14 degrees; and a third tangent line is arranged at the trailing edge vertex positioned on the middle arc line of the blade profile of the fan blade, a fourth tangent line is arranged at the trailing edge vertex positioned on the second preset circle, and an outlet angle beta of the fan blade is formed between the third tangent line and the fourth tangent line, wherein the outlet angle beta meets the following conditions: 41 DEG is less than or equal to 47 DEG, the camber line of the blade is constructed through the blade profile inlet angle alpha and the outlet angle beta of specific parameters, so that the flow loss of air flow in the blade is reduced by reasonably designing the blade profile of the blade, the air flow of the centrifugal blade at the same rotating speed is increased, the air supply efficiency of the centrifugal blade is further improved, the noise generated in the running process of the blade can be reduced, the problems of lower air supply efficiency and larger running noise of the centrifugal fan in the prior art are solved, and the use experience of a user is improved.
It will be apparent that the embodiments described above are merely some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (12)

1. A centrifugal fan blade, characterized by comprising:
the body comprises a top plate (10), a bottom plate (20) and a hub (30), wherein the hub (30) is arranged on the bottom plate (20), and the top plate (10) and the bottom plate (20) are arranged oppositely;
the fan blades (40) are arranged between the top plate (10) and the bottom plate (20), the front edge vertexes of the fan blades (40) are arranged on a first preset circle (41), the rear edge vertexes of the fan blades (40) are arranged on a second preset circle (42), and the first preset circle (41) is positioned on the inner side of the second preset circle (42);
the leading edge vertex which is positioned on a profile camber line (43) of the fan blade (40) is used as a first tangent line, the leading edge vertex which is positioned on the first preset circle (41) is used as a second tangent line, a profile inlet angle alpha of the fan blade (40) is formed between the first tangent line and the second tangent line, and the profile inlet angle alpha meets the following conditions: alpha is more than or equal to 8 degrees and less than or equal to 14 degrees; a third tangent line is formed by passing through a trailing edge vertex on a blade profile camber line (43) of the fan blade (40), a fourth tangent line is formed by passing through a trailing edge vertex on the second preset circle (42), and an outlet angle beta of the fan blade (40) is formed between the third tangent line and the fourth tangent line, and meets the following conditions: beta is more than or equal to 41 degrees and less than or equal to 47 degrees.
2. Centrifugal fan blade according to claim 1, wherein the airfoil inlet angle alpha is 10 ° and the outlet angle beta is 43 ° or 45 °.
3. Centrifugal fan blade according to claim 1, wherein the arc length radius R of the airfoil mean camber line (43) satisfies: r is more than or equal to 1000mm and less than or equal to 1050mm.
4. Centrifugal fan blade according to claim 1, wherein the airfoil mean camber line (43) is a segment of a fourth-order Bezier curve defined by five control points.
5. The centrifugal fan blade according to claim 4, wherein the five control points comprise a point P1, a point P2, a point P3, a point P4 and a point P5;
the coordinates (X1, Y1) of the P1 point satisfy: x1=0, y1=0;
the coordinates (X2, Y2) of the P2 point satisfy: x2 is more than or equal to 0.17 and less than or equal to 0.22C, Y2 is more than or equal to 2.5mm and less than or equal to 3.3mm;
the coordinates (X3, Y3) of the P3 point satisfy: x3 is more than or equal to 0.42 and less than or equal to 0.50C, Y3 is more than or equal to 3.3mm and less than or equal to 3.8mm;
the coordinates (X4, Y4) of the P4 point satisfy: x4 is more than or equal to 0.71 and less than or equal to 0.78C, Y4 is more than or equal to 1.1mm and less than or equal to 1.6mm;
the coordinates (X5, Y5) of the P5 point satisfy: x4=c, y5=0;
wherein C is the chord length of the blade profile of the fan blade (40).
6. Centrifugal fan blade according to claim 1, wherein the thickness distribution function of the fan blade (40) is;
y＝A·x+B·x 2 +C·x 3 +D·x 4 +E·x 5 +F·x 6 +G；
wherein, along the chord length direction of the fan blade (40), y is the thickness of different positions on the fan blade (40), A is more than or equal to 1.78 and less than or equal to 1.99, B is more than or equal to-086 and less than or equal to-0.073,0.0013 and C is more than or equal to-0.0016, and is more than or equal to 1.58X10 -5 ≤D≤-1.13×10 -5 ，5.01×10 -8 ≤E≤7.60×10 -8 ，-1.446×10 -11 ≤F≤0.8681×10 -11 ，0.43≤G≤1.40。
7. Centrifugal fan blade according to claim 1, wherein the bottom plate (20) is a circular plate, the diameter of the second preset circle (42) is identical to the outer diameter of the circular plate, and the circular plate is coaxially arranged with the second preset circle (42).
8. The centrifugal fan blade according to claim 1, further comprising:
the reinforcing ribs are arranged between the bottom plate (20) and the fan blades (40) and are arranged around the outer peripheral surfaces of the fan blades (40).
9. Centrifugal fan blade according to claim 1, wherein the cross-sectional area of the fan blade (40) is uniform along the direction of the upper edge to the lower edge of the fan blade (40).
10. Centrifugal fan blade according to claim 1, wherein the trailing edge of the fan blade (40) is notched.
11. A centrifugal fan comprising a centrifugal fan blade according to any one of claims 1 to 10.
12. An air conditioning apparatus comprising a centrifugal fan blade according to any one of claims 1 to 10.
CN202223261454.3U 2022-12-06 2022-12-06 Centrifugal fan blade, centrifugal fan and air conditioner Active CN219139456U (en)

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CN202223261454.3U CN219139456U (en) 2022-12-06 2022-12-06 Centrifugal fan blade, centrifugal fan and air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202223261454.3U CN219139456U (en) 2022-12-06 2022-12-06 Centrifugal fan blade, centrifugal fan and air conditioner

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Country Link
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