CN220890579U - Fan blade, impeller and axial flow fan - Google Patents
Fan blade, impeller and axial flow fan Download PDFInfo
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- CN220890579U CN220890579U CN202322336069.9U CN202322336069U CN220890579U CN 220890579 U CN220890579 U CN 220890579U CN 202322336069 U CN202322336069 U CN 202322336069U CN 220890579 U CN220890579 U CN 220890579U
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Abstract
The application relates to a fan blade, an impeller and an axial flow fan, wherein the fan blade comprises: the blade body is provided with a suction surface and a pressure surface which are opposite; and the wing bodies are arranged on one side of the suction surface of the blade body and are distributed at intervals along the spreading direction of the blade body, the geometric dimensions of the multi-stage wing bodies and the included angles between the multi-stage wing bodies and the blade body are different, the wing bodies extend from the front edge to the tail edge of the blade body, the molded lines of the wing bodies are fitting curves, wherein the front edge and the tail edge are arranged at two ends of the rotation direction of the blade body, and the spreading direction refers to the length direction from the blade root of the blade body to the blade tip. According to the application, the multistage bionic wing body is arranged on one side of the suction surface of the blade body, so that the air quantity of the axial flow fan under different static pressure conditions can be improved, the performance requirements under different working conditions are met, and the application occasions and the adaptability of the fan are increased.
Description
Technical Field
The application relates to the technical field of ventilation equipment, in particular to a fan blade, an impeller and an axial flow fan.
Background
Along with the development of technology, the application occasions of the axial flow fan are increased, wherein the axial flow fan comprises a plurality of special working environments (such as a machine room, a mine, a shelter and the like), and new requirements are put on the design of the axial flow fan, such as small size, large air quantity, high static pressure and the like. In some working scenarios, limited by the size of the equipment, small-sized axial fans are required, however, conventional small-sized axial fans cannot provide sufficient air volume in a high static pressure environment. In order to balance the contradiction between the small size and the large air quantity, the rotating speed of the fan is often selected to be increased, but the working efficiency of the fan is also reduced, and the energy waste is caused.
Disclosure of utility model
The application aims to provide a fan blade, an impeller and an axial flow fan, wherein a multi-stage bionic wing body is arranged on one side of a suction surface of a blade body, so that the air quantity of the axial flow fan under different static pressure conditions can be improved, the performance requirements under different working conditions can be met, and the application occasions and the adaptability of the fan are improved.
In a first aspect, an embodiment of the present application provides a fan blade, including: the blade body is provided with a suction surface and a pressure surface which are opposite; and the multistage airfoil body is arranged on one side of the suction surface of the blade body and is distributed at intervals along the spreading direction of the blade body, the geometric dimension of the multistage airfoil body and the included angle between the multistage airfoil body and the blade body are different, the airfoil body extends from the front edge to the tail edge of the blade body, the molded line of the airfoil body is a fitting curve, the front edge and the tail edge are arranged at two ends of the rotation direction of the blade body, and the spreading direction refers to the length direction from the blade root of the blade body to the blade tip.
In one possible embodiment, the airfoil body includes an airfoil leading edge and an airfoil trailing edge, the profile of the airfoil leading edge and the profile of the airfoil trailing edge being respectively Bezier curves.
In one possible embodiment, if the chord length of the airfoil body is c, the position vector coordinate points of the control bezier curve are respectively: airfoil leading edges (0.0123 c, 0.004c), (0, 0.005c), (0.05 c, -0.018 c), (0, -0.01 c); airfoil trailing edges (-0.002 c, 0.002c), (0, 0.002c) (-0.025 c, -0.006 c), (0, 0.005 c).
In one possible embodiment, the airfoil body further includes suction and pressure sides disposed opposite each other between the airfoil leading edge and the airfoil trailing edge, the suction and pressure sides having respective polynomial curves.
In one possible embodiment, the profile of the suction side is a quadratic polynomial curve as follows:
y＝a1x+a2x2+c1
wherein a 1＝-0.02623±0.00601,a2＝0.001±0.0000532398,c1 = 0.44627 ± 0.01439.
In one possible embodiment, the pressure-side profile is a polynomial curve of the order of three:
y＝b1x+b2x2+b3x3+c2
Wherein the method comprises the steps of ,b1＝-0.51869±0.13998,b2＝0.10278±0.02164,b3＝-0.0042±0.0013,c2＝-1.60333±0.13998.
In one possible embodiment, the multi-stage airfoil body includes a first airfoil body, a second airfoil body, and a third airfoil body, the spanwise length of the blade body being h, the first airfoil body, the second airfoil body, and the third airfoil body being located at positions of 0.3h, 0.75h, and 1h, respectively, of the blade body.
In one possible embodiment, the heights of the first airfoil body, the second airfoil body, and the third airfoil body are gradually increased; and/or the widths of the first airfoil body, the second airfoil body and the third airfoil body are equal; and/or the included angle between the first airfoil body and the blade body is 145 degrees, the included angle between the second airfoil body and the blade body is 110 degrees, and the included angle between the third airfoil body and the blade body is 100 degrees.
In a second aspect, an embodiment of the present application further provides an impeller, including: a hub; and a plurality of fan blades which are arranged at intervals along the outer peripheral side of the hub.
In a third aspect, an embodiment of the present application further provides an axial flow fan, including: an impeller as described hereinbefore; and the driving motor is arranged at the rotating central shaft of the hub of the impeller and is used for driving the impeller to rotate.
The blade comprises a blade body and a multi-stage airfoil body, wherein the blade body is provided with a suction surface and a pressure surface which are opposite to each other, the multi-stage airfoil body is arranged on one side of the suction surface of the blade body and is distributed at intervals along the expanding direction of the blade body, the geometry of the multi-stage airfoil body and the included angle between the multi-stage airfoil body and the blade body are arranged differently, the airfoil body extends from the front edge to the tail edge of the blade body, the molded line of the airfoil body is formed by curve fitting, the front edge and the tail edge are arranged at two ends of the blade body along the rotating direction of the blade body, and the expanding direction refers to the length direction from the blade root of the blade body to the blade tip. Therefore, the multistage bionic wing body is arranged on one side of the suction surface of the blade body, so that the air quantity of the axial flow fan under different static pressure conditions can be improved, the performance requirements under different working conditions are met, the application occasion and the adaptability of the axial flow fan are increased, and the axial flow fan is particularly suitable for small high-speed axial flow fans with diameters below 20 cm and rotating speeds above 6000 rpm.
Drawings
Features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings. In the drawings, like parts are designated with like reference numerals. The drawings are not drawn to scale, but are merely for illustrating relative positional relationships, and the layer thicknesses of certain portions are exaggerated in order to facilitate understanding, and the layer thicknesses in the drawings do not represent the actual layer thickness relationships.
Fig. 1 shows a schematic structural diagram of an impeller according to an embodiment of the present application;
FIG. 2 illustrates a schematic view of an expanded structure of a blade of the impeller shown in FIG. 1 along a length direction of an airfoil body;
FIG. 3 illustrates a schematic structural view of an airfoil body of the fan blade shown in FIG. 2;
FIG. 4 shows a schematic view of coordinate points and a fitted line of the suction side and pressure side of the airfoil body shown in FIG. 3;
FIG. 5 shows a profile of the blade surface velocity and position of each stage of airfoil bodies shown in FIG. 2;
FIG. 6 shows a cross-sectional view of the impeller of FIG. 5 taken along the direction A-A;
FIG. 7 shows an enlarged partial view of region B of FIG. 6;
fig. 8 shows a graph of performance curves of different types of high-speed axial fans at a rotational speed of 8900 rpm.
Drawings
1. A fan blade;
10. A blade body; 10a, suction surface; 10b, a pressure surface; 11. an airfoil body; 111. an airfoil leading edge; 112. an airfoil trailing edge; 113. a suction side; 114. a pressure side;
2. a hub.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In some working scenarios, limited by space size, small-sized axial fans need to be provided. However, the conventional small axial fan cannot provide enough air volume in a high static pressure environment. In order to balance the contradiction between the small size and the large air quantity, the rotating speed of the fan is often selected to be increased, but the working efficiency of the fan is also reduced, and the energy waste is caused.
The inventor finds that the wind quantity of the fan can be effectively improved under the same rotating speed condition by optimizing the thickness distribution of the blades and changing the wing shape of the fan, and the multi-stage wing body 11 is designed on the surface of the blade, so that the leakage problem of the fan can be solved, and the anti-static pressure capability of the fan blade is further improved.
Therefore, the application provides the fan blade 1, the impeller and the axial flow fan, which can improve the air quantity of the axial flow fan under different static pressure conditions by arranging the multi-stage bionic wing body 11 on one side of the suction surface of the blade body 10, meet the performance requirements under different working conditions, increase the application occasions and the adaptability of the fan, and are particularly suitable for small high-speed axial flow fans with diameters below 20 cm and rotating speeds above 6000 rpm.
Fig. 1 shows a schematic structural diagram of an impeller according to an embodiment of the present application; FIG. 2 illustrates a schematic view of an expanded structure of a blade of the impeller shown in FIG. 1 along a length direction of an airfoil body; fig. 3 shows a schematic structural view of an airfoil body of the fan blade shown in fig. 2.
As shown in fig. 1 to 3, an embodiment of the present application provides an impeller, which is installed on an axial flow fan and can be applied to an outdoor unit of an air conditioner. The impeller comprises a hub 2 and a plurality of blades 1 which are arranged at intervals along the peripheral side of the hub 2, the hub 2 is used as a support of the blades 1, and the plurality of blades 1, such as 2, 3, 4, 5, 6 and the like, are uniformly distributed on the periphery of the round hub with the axle center.
The fan blade 1 comprises a blade body 10 and a multi-stage airfoil body 11, wherein the blade body 10 is provided with a suction surface 10a and a pressure surface 10b which are opposite, the multi-stage airfoil body 11 is arranged on one side of the suction surface 10a of the blade body 10 and is distributed at intervals along the expanding direction of the blade body 10, the geometric dimension of the multi-stage airfoil body 11 and the included angle between the multi-stage airfoil body and the blade body 10 are arranged differently, the airfoil body 11 extends from the front edge to the tail edge of the blade body 10, the molded line of the airfoil body 11 is a fitting curve, and the front edge and the tail edge are arranged along the two ends of the rotation direction of the blade body 10.
In this embodiment, the connection between the blade body 10 and the hub 2 is a blade root, i.e. the inner edge of the blade 1, the outer edge of the blade 1 is far from the blade root, and the front edge and the rear edge are at the two ends along the rotation direction of the blade body 10.
The blade body 10 may have a particular profile including, but not limited to, a particular sweep feature, blade thickness, spatial twist angle, etc., with smooth transitions at the leading edge, trailing edge, and multi-stage airfoil body 11 of the blade body 10. The shape, sweep, thickness and angle of the blade body 10 in space are determined by the pressure surface and the suction surface, wherein the pressure surface is the direction surface of the blade near the air outlet side when the axial flow fan works, and the suction surface is the direction surface near the air inlet side. The pressure surface and the suction surface are curved surfaces formed by projection lines of all spatial contour lines on the corresponding circumferential surfaces, the integral tendency of the sweep degree is that the pressure surface is a concave surface, the suction surface is a convex surface, the specific sweep degree is determined by a corresponding contour line equation, the flow field of the blade is smoother within the sweep degree range, and the pressure distribution on the surface of the blade is more uniform.
In one example, the blade body 10 is obtained by scaling, rotating and sweeping the airfoil section along a space curve; the airfoil section includes a windward line and a leeward line, the windward line is a straight line, the leeward line is a downward convex curve, the windward line and the leeward line meet to form a front point and a rear point, and the windward line, the leeward line, the front point and the rear point are respectively swept to form a pressure surface, a suction surface, a front edge and a rear edge of the blade body 10.
The airfoil body 11 extends from the leading edge to the trailing edge of the blade body 10, and the profile of the airfoil body 11 is arranged in a curve in the form of a shark outer profile. Compared with the traditional flat-plate wing-shaped fan blade, the bionic wing-shaped fan blade 1 can effectively improve the pressure difference between the upper surface and the lower surface of the fan blade body 10, improve the static pressure resistance of the fan blade 1 and enhance the acting capacity of an axial flow fan.
Further, the multi-stage airfoil bodies 11 are disposed on one side of the suction surface 10a of the blade body 10 and are distributed along the spanwise direction of the blade body 10 at intervals, that is, the multi-stage airfoil bodies 11 are distributed according to the speed of the surface of the blade body 10, the geometric dimensions of the airfoil bodies 11 and the included angles between the airfoil bodies and the blade body 10 are changed to different extents, and through the cooperation between the three-stage airfoil bodies 11, the flow leakage of the axial flow fan can be prevented, and the static pressure resistance of the fan blade 1 is further improved.
The "spanwise direction" is an inherent property of the blade body 10, and refers to a longitudinal direction from the root to the tip of the blade body 10, and is only for illustrating that each stage of airfoil bodies 11 is located at a specific position of the blade body 10.
The embodiment of the application provides a fan blade 1 and an impeller, wherein the fan blade 1 comprises a blade body 10 and a multi-stage airfoil body 11, the blade body 10 is provided with a suction surface and a pressure surface which are opposite, the multi-stage airfoil body 11 is arranged on one side of the suction surface of the blade body 10 and is distributed at intervals along the spanwise direction of the blade body 10, the geometric dimension of the multi-stage airfoil body 11 and the included angle between the multi-stage airfoil body 11 and the blade body 10 are arranged differently, the airfoil body 11 extends from the front edge to the tail edge of the blade body 10, and the molded line of the airfoil body 11 is in a curve arrangement in the form of a shark outline, wherein the front edge and the tail edge are arranged along two ends of the rotation direction of the blade body 10. Therefore, the multistage bionic wing body 11 is arranged on one side of the suction surface of the blade body 10, so that the air quantity of the axial flow fan under different static pressure conditions can be improved, the performance requirements under different working conditions are met, the application occasion and the adaptability of the fan are increased, and the novel bionic wing body is particularly suitable for small high-speed axial flow fans with diameters below 20 cm and rotating speeds above 6000 rpm.
In some embodiments, airfoil body 11 includes an airfoil leading edge 111 and an airfoil trailing edge 112, with the profile of airfoil leading edge 111 and the profile of airfoil trailing edge being Bezier (Bezier) curves, respectively.
The Bezier curve is calculated as follows:
Wherein P i is the position vector of each vertex, B i,n (t) is the Berns function, and the expression is
Further, if the chord length of the airfoil body 11 is c, the position vector coordinate points of the control bezier curve may be controlled by the following 4 coordinate points:
Airfoil leading edges (0.0123 c, 0.004c), (0, 0.005c), (0.05 c, -0.018 c), (0, -0.01 c);
Airfoil trailing edges (-0.002 c, 0.002c), (0, 0.002c) (-0.025 c, -0.006 c), (0, 0.005 c).
Substituting the vector coordinate points of each position into the calculation formula of the Bezier curve can obtain the curves of the airfoil leading edge 111 and the airfoil trailing edge 112, as shown in FIG. 3.
Further, the airfoil body 11 further includes a suction side 113 and a pressure side 114 disposed between the airfoil leading edge 111 and the airfoil trailing edge 112 and opposite to each other, and the molded lines of the suction side 113 and the pressure side 114 are polynomial curves, respectively.
Fig. 4 shows a schematic view of coordinate points and a fitted line of suction side and pressure side of the airfoil body shown in fig. 3. As shown in fig. 4, coordinate points of the pressure side 114 and the suction side 113 of the airfoil body 11 are obtained by scanning a molded line outside the shark body, and polynomial fitting is performed according to the positions of the coordinate points to obtain molded line related parameters of the pressure side 114 and the suction side 113 of the airfoil body 11, and the coordinate points of the airfoil body 11 are shown in table 1.
The profile of suction side 113 and pressure side 114 may be controlled by 20 coordinate points, which are related to the chord c of blade body 10. When the chord length c is changed, the coordinate points of the airfoil body 11 are also changed, and curve fitting is performed according to the coordinate point positions, so as to obtain the molded lines of the pressure side 114 and the suction side 113 of the airfoil body 11.
Further, the profile of suction side 113 is a quadratic polynomial curve as follows:
y＝a1x+a2x2+c1
wherein a 1＝-0.02623±0.00601,a2＝0.001±0.0000532398,c1 = 0.44627 ± 0.01439.
Further, the profile of the pressure side 114 is a polynomial curve of the third order:
y＝b1x+b2x2+b3x3+c2
Wherein the method comprises the steps of ,b1＝-0.51869±0.13998,b2＝0.10278±0.02164,b3＝-0.0042±0.0013,c2＝-1.60333±0.13998.
Table 1 coordinate points of airfoil bodies 11
| Coordinate point | X-axis coordinates | Y-axis coordinate (suction side) | Y-axis coordinate (pressure side) |
| 1 | 0.1c | 0.0428c | -0.197c |
| 2 | 0.2c | 0.0408c | -0.232c |
| 3 | 0.3c | 0.0356c | -0.242c |
| 4 | 0.4c | 0.0347c | -0.227c |
| 5 | 0.5c | 0.0338c | -0.211c |
| 6 | 0.6c | 0.0332c | -0.186c |
| 7 | 0.7c | 0.0318c | -0.16c |
| 8 | 0.8c | 0.0311c | -0.141c |
| 9 | 0.9c | 0.0295c | -0.104c |
| 10 | 1c | 0.0272c | -0.065c |
In some embodiments, the multi-stage airfoil body 11 includes a first airfoil body, a second airfoil body, and a third airfoil body, the spanwise length of the blade body 10 being h, the first, second, and third airfoil bodies being located at positions of 0.3h, 0.75h, and 1h, respectively, of the blade body 10.
FIG. 5 shows a profile of the blade surface velocity and the position of each stage of airfoil bodies shown in FIG. 2.
The positions of the multi-stage airfoil bodies 11 are related to the speed distribution of the surface of the blade body 10, and the three-stage airfoil bodies 11 are arranged at different positions along the spanwise length of the blade body 10 according to the speed distribution of the surface of the blade body 10 in order to effectively improve the static pressure resistance of the fan blade.
As shown in fig. 5, the first airfoil body is located at a position (near the blade root) where the spanwise length of the blade body 10 is 0.3h, the second airfoil body is located at a position where the spanwise length of the blade body 10 is 0.75h, and the third airfoil body is located at a position (away from the blade root) where the spanwise length of the blade body 10 is h. The protrusion height and the included angle of each stage of airfoil bodies 11 are changed to different degrees, and through the cooperation between the three stages of airfoil bodies 11, the flow leakage of the axial flow fan can be prevented, and the static pressure resistance of the fan blade 1 is further improved.
FIG. 6 shows a cross-sectional view of the impeller of FIG. 5 taken along the direction A-A; fig. 7 shows a partial enlarged view of the region B in fig. 6.
As shown in fig. 6 and 7, the structure of airfoil body 11 is mainly composed of three parameters: width, height, and angle θ between airfoil body 11 and blade body 10. The structural dimensions and positions of the airfoil bodies 11 all affect the performance of the high-speed axial flow fan, in order to obtain effective parameter combinations, the positions, heights, widths and included angles theta of the airfoil bodies 11 are analyzed by adopting orthogonal tests, and according to simulation results, the optimal parameter combination ranges are obtained, and specific size combinations are shown in table 2.
Table 2 structural parameters of multi-stage airfoil body 11
| Position of | Height H/mm | Width W/mm | Included angle theta/deg |
| 0.3h | 0.019h±0.005h | 0.01h±0.005h | 145° |
| 0.75h | 0.025h±0.005h | 0.01h±0.005h | 110° |
| 1h | 0.03h±0.005h | 0.01h±0.005h | 100° |
Alternatively, the heights H of the first, second, and third wing bodies are gradually increased.
Optionally, the widths W of the first airfoil body, the second airfoil body, and the third airfoil body are equal.
Alternatively, the angle θ between the first airfoil body and the blade body 10 is 145 °, the angle θ between the second airfoil body and the blade body is 110 °, and the angle θ between the third airfoil body and the blade body 10 is 100 °.
Fig. 8 shows a graph of performance curves of different types of high-speed axial fans at a rotational speed of 8900 rpm. As shown in fig. 8, after the small high-speed axial flow fan in this embodiment adopts the fan blade 1 with the multi-stage bionic airfoil body 11 structure, compared with the axial flow fan with a flat airfoil shape, the air volume of the small high-speed axial flow fan in different static pressure intervals is obviously improved, and the average lifting amount is 33.5%. The lifting under the low static pressure condition is not obvious compared with the axial flow fan with only one bionic airfoil body 11; however, when the static pressure condition is greater than 150Pa, the air quantity of the high-speed axial flow fan designed by the multi-stage bionic wing body 11 is obviously improved, and compared with a fan with only one bionic wing body 11, the air quantity is improved by 13.25%, which also shows that the multi-stage bionic wing body 11 can effectively improve the high static pressure performance of the fan, meet the performance requirements under different working conditions, and increase the application occasion and the adaptability of the fan.
In addition, an embodiment of the present application also provides an axial flow fan, which is applicable to an air conditioner outdoor unit, including: the impeller and the driving motor are arranged at the rotation center shaft of the hub 2 of the impeller and are used for driving the impeller to rotate.
According to the axial flow fan provided by the embodiment of the application, the multistage bionic wing body 11 is arranged on one side of the suction surface of the blade body 10 of the impeller, so that the air quantity of the axial flow fan under different static pressure conditions can be improved, the performance requirements under different working conditions can be met, the application occasion and the adaptability of the axial flow fan are increased, and the axial flow fan is particularly suitable for small high-speed axial flow fans with diameters below 20 cm and rotating speeds above 6000 rpm.
It can be understood that the application occasion of the axial flow fan provided by the embodiment of the application is not limited to an air conditioner, but can be household ventilation equipment such as a range hood, a dust remover and the like or other ventilation occasions with narrow space.
It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
It should be readily understood that the terms "on … …", "above … …" and "above … …" in this disclosure should be interpreted in the broadest sense so that "on … …" means not only "directly on something" but also includes "on something" with intermediate features or layers therebetween, and "above … …" or "above … …" includes not only the meaning "on something" or "above" but also the meaning "above something" or "above" without intermediate features or layers therebetween (i.e., directly on something).
Further, spatially relative terms, such as "below," "beneath," "above," "over," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (10)
1. A fan blade, characterized by comprising:
The blade body is provided with a suction surface and a pressure surface which are opposite; and
The multistage airfoil body, set up in suction face one side of blade body, and follow the exhibition of blade body is to interval distribution, multistage the geometry of airfoil body and with contained angle between the blade body is different to be set up, the airfoil body by the leading edge of blade body extends to the trailing edge, just the molded lines of airfoil body are the fitting curve, wherein, the leading edge with the trailing edge is followed the both ends setting of the direction of rotation of blade body, exhibition is to the length direction of blade root to the apex of blade body.
2. The blade of claim 1, wherein the airfoil body includes an airfoil leading edge and an airfoil trailing edge, and wherein the profile of the airfoil leading edge and the profile of the airfoil trailing edge are respectively bezier curves.
3. The fan blade according to claim 2, wherein, when the chord length of the airfoil body is c, the position vector coordinate points of the control bezier curve are respectively:
Airfoil leading edges (0.0123 c, 0.004c), (0, 0.005c), (0.05 c, -0.018 c), (0, -0.01 c);
Airfoil trailing edges (-0.002 c, 0.002c), (0, 0.002c) (-0.025 c, -0.006 c), (0, 0.005 c).
4. The blade of claim 2, wherein the airfoil body further comprises a suction side and a pressure side disposed opposite each other between the airfoil leading edge and the airfoil trailing edge, the suction side and pressure side having respective lines of polynomial curves.
5. The fan blade of claim 4, wherein the line of the suction side is a quadratic polynomial curve as follows:
y＝a1x+a2x2+c1
wherein a 1＝-0.02623±0.00601,a2＝0.001±0.0000532398,c1 = 0.44627 ± 0.01439.
6. The fan blade of claim 4, wherein the pressure side profile is a cubic polynomial curve as follows:
y＝b1x+b2x2+b3x3+c2
Wherein the method comprises the steps of ,b1＝-0.51869±0.13998,b2＝0.10278±0.02164,b3＝-0.0042±0.0013,c2＝-1.60333±0.13998.
7. The fan blade of claim 1, wherein the multi-stage airfoil body comprises a first airfoil body, a second airfoil body, and a third airfoil body, the spanwise length of the blade body is h, and the first airfoil body, the second airfoil body, and the third airfoil body are located at 0.3h, 0.75h, and 1h of the blade body, respectively.
8. The fan blade of claim 7, wherein the heights of the first airfoil body, the second airfoil body, and the third airfoil body are gradually increased;
and/or the widths of the first airfoil body, the second airfoil body and the third airfoil body are equal;
And/or the included angle between the first airfoil body and the blade body is 145 degrees, the included angle between the second airfoil body and the blade body is 110 degrees, and the included angle between the third airfoil body and the blade body is 100 degrees.
9. An impeller, comprising:
A hub; and
A plurality of blades according to any one of claims 1 to 8, spaced along the outer peripheral side of the hub.
10. An axial flow fan, comprising:
An impeller according to claim 9; and
The driving motor is arranged at the rotating central shaft of the hub of the impeller and used for driving the impeller to rotate.
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| CN202322336069.9U CN220890579U (en) | 2023-08-29 | 2023-08-29 | Fan blade, impeller and axial flow fan |
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| CN202322336069.9U CN220890579U (en) | 2023-08-29 | 2023-08-29 | Fan blade, impeller and axial flow fan |
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