CN115324929B - Motor fan blade and motor fan - Google Patents
Motor fan blade and motor fan Download PDFInfo
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- CN115324929B CN115324929B CN202211263919.0A CN202211263919A CN115324929B CN 115324929 B CN115324929 B CN 115324929B CN 202211263919 A CN202211263919 A CN 202211263919A CN 115324929 B CN115324929 B CN 115324929B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
Abstract
The embodiment of the invention provides a motor fan blade and a motor fan, and relates to the technical field of motor fans. The section of flabellum is the symmetry wing section, the symmetry wing section includes camber line, mean camber line and camber line down, the camber line with the camber line is down in order the mean camber line symmetry, the symmetry wing section has blunt form trailing edge, blunt form trailing edge does lie in the afterbody of symmetry wing section go up the camber line with straightway border between the camber line down. The fan blade provided by the embodiment of the invention can improve the efficiency of the fan, reduce the loss generated by the fan in the running process, further avoid sacrificing some air inlet volume and heat radiation performance, avoid selecting a fan with a small size of one, avoid increasing the using amount of enameled wires and reduce the cost. Moreover, the symmetrical airfoil profile is provided with the blunt trailing edge, so that the processing and the production are convenient.
Description
Technical Field
The invention relates to the technical field of motor fans, in particular to a motor fan blade and a motor fan.
Background
The cross section of the motor fan used at present is a flat plate, and when the loss of the fan is tested to be higher, the fan with the size of one small is selected at the expense of some air intake and heat dissipation performance. In order to reduce the heating loss of the motor, the amount of the enameled wire is generally increased, which increases the cost of the motor.
Disclosure of Invention
The embodiment of the invention provides a fan of a blunt-trailing-edge wing-type motor, which can reduce the loss of the fan.
In a first aspect, an embodiment of the present invention provides an electric machine fan blade, where a cross section of the fan blade is a symmetric airfoil, where the symmetric airfoil includes an upper arc line, a middle arc line, and a lower arc line, where the upper arc line and the lower arc line are symmetric with respect to the middle arc line, the symmetric airfoil has a blunt trailing edge, and the blunt trailing edge is a straight line segment edge located between the upper arc line and the lower arc line in a tail portion of the symmetric airfoil.
In one embodiment, the length of the straight line segment edge is 5% -10% of the chord length of the symmetrical airfoil, and the chord length is the length of the mean camber line.
In one embodiment, the lateral width of the fan blade increases from the blunt trailing edge to the insertion position; the embedded position is a position where a rotor shaft of the motor fan is embedded in the fan blade, and the transverse direction of the fan blade is along a direction perpendicular to the axial direction between the plane where the fan blade is located and the blunt trailing edge and the leading edge.
Further, the flabellum can have polygonal outer contour on the plane, the polygon is the hexagon structure that is formed by first limit, second limit, third limit, fourth edge, fifth limit and the sixth limit that connects gradually, first limit is blunt form trailing edge, first limit with contained angle between the second limit with contained angle between the third limit is the obtuse angle, the embedding position is located the third limit with on the sixth limit.
Further, the included angle between the first side and the sixth side is 90 °; the included angle between the first edge and the second edge is equal to the included angle between the second edge and the third edge and ranges from 135 degrees to 145 degrees; the included angle between the sixth edge and the fifth edge is 90-135 degrees, the included angle between the fifth edge and the fourth edge is 90 degrees, and the included angle between the fourth edge and the third edge is 125-135 degrees.
In one embodiment, the distance between the symmetrical positions on the upper camber line and the lower camber line of the symmetrical airfoil is determined in advance according to the maximum thickness, the chord length and the length of the edge of the straight line segment of the symmetrical airfoil.
Further, the distance between the symmetrical positions on the upper arc line and the lower arc line of the symmetrical airfoil profile is calculated by adopting a first calculation formula, wherein the first calculation formula is as follows:
y=
+
wherein y is the distance between symmetrical positions on the upper arc and the lower arc on the abscissa xA horizontal axis of a coordinate system adopted by the first calculation formula extends along the chord length direction, a vertical axis extends along the direction vertical to the chord length, t is the ratio between the maximum thickness and the chord length of the symmetrical airfoil profile, g is the ratio between the length of the edge of the straight line segment and the chord length, c is the chord length, and n is a continuity control parameter of the symmetrical airfoil profile,
and the abscissa corresponds to the maximum thickness.
Further, the continuity control parameter is obtained by calculating in advance using a second calculation formula, where the second calculation formula includes:
in the formula, a is an empirical parameter, and the value range of a is (13, 14).
In a second aspect, an embodiment of the present invention provides a motor fan, which is characterized by including a rotor shaft and a preset number of fan blades embedded on the rotor shaft, where the fan blades are the motor fan blades provided in the first aspect.
According to the motor fan blade and the motor fan provided by the embodiment of the invention, the fan blade can be ensured to rotate clockwise and anticlockwise, namely rotate forwards and reversely, because the cross section of the fan blade is of a symmetrical wing shape. The fan blade provided by the embodiment of the invention can reduce the loss generated in the operation of the fan, further does not need to sacrifice some air intake and heat dissipation performance, does not need to select a fan with a small size, does not need to increase the using amount of enameled wires, and can reduce the cost. Moreover, the symmetrical airfoil profile is provided with the blunt trailing edge, so that the processing and the production are convenient.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions in the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is also possible for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of a symmetrical airfoil having a blunt trailing edge in one embodiment of the present invention;
FIG. 2 is a schematic plan view of a fan blade according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a fan blade according to the prior art;
FIG. 4 is a schematic view of an air flow field provided for the fan blade of FIG. 3;
FIG. 5 is a schematic view of a symmetrical airfoil having a pointed trailing edge in one embodiment of the invention;
FIG. 6 is a schematic view of a fan according to an embodiment of the present invention;
FIG. 7 is a schematic plan view of a fan blade according to the prior art.
Reference numerals:
| 11 | |
| 12 | |
| 13 | |
| 14 | |
| 15 | Blunt |
| 21 | |
| 22 | |
| 23 | |
| 24 | |
| 25 | |
| 26 | Sixth side |
| A-A | |
| 200 | |
| 100 | Fan blade |
| B1、B2 | The position point of the upper arc line and the position point of the lower arc line corresponding to the maximum thickness |
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, it is obvious that the described embodiments are some, but not all embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
In a first aspect, an embodiment of the present invention provides an electric motor fan blade.
Referring to fig. 1, the cross section of the fan blade is a symmetrical airfoil, the symmetrical airfoil includes an upper arc 11, a middle arc 13 and a lower arc 12, the upper arc 11 and the lower arc 12 are symmetrical about the middle arc 13, the symmetrical airfoil has a blunt trailing edge 15, and the blunt trailing edge 15 is a straight line segment edge between the upper arc 11 and the lower arc 12 in the tail of the symmetrical airfoil.
Wherein, symmetrical wing type means the wing type camber is zero, namely the upper and lower camber line 12 symmetry's wing type. The symmetrical airfoil has an upper camber line 11, a lower camber line 12 and a mean camber line 13, and the upper camber line 11 and the lower camber line 12 are symmetrically arranged with the mean camber line 13, and the mean camber line 13 connects a leading edge and a trailing edge of the airfoil, which may also be referred to as a trailing edge. In a symmetrical airfoil, the length of the mean camber line 13 is also the chord length.
The symmetrical wing profile comprises a front part, a middle part and a tail part, wherein the front part comprises an arc-shaped front edge 14 and a part of connected upper camber line 11 and lower camber line 12; the middle part is a main upper arc 11 and a lower arc 12 which are in the middle, and the tail part comprises a blunt tail edge 15 and a part of the upper arc 11 and the lower arc 12 which are connected.
Referring to fig. 1, in the embodiment of the present invention, the trailing edge is a straight line edge, and may be obtained by performing passivation on a pointed trailing edge. The straight shaped trailing edge may be referred to as a blunt trailing edge. In fig. 1, the leading edge is arc-shaped.
It is understood that symmetrical airfoil refers to the cross-sectional shape of the fan blade. Referring to fig. 2, which isbase:Sub>A schematic view ofbase:Sub>A plane shape of the fan blade, the cross section isbase:Sub>A cross section obtained by dividing alongbase:Sub>A-base:Sub>A, and the shape of the cross section isbase:Sub>A symmetrical airfoil shape, that is, the symmetrical airfoil shape shown in fig. 1 can be obtained by dividing alongbase:Sub>A dividing linebase:Sub>A-base:Sub>A.
In the prior art, the cross section of the fan blade is mostly in a flat plate shape, and the cross section is shown in fig. 3. The situation that constant wind speed passes through the flat plate type fan blade is observed through a finite element fluid simulation method, and an air flow field as shown in figure 4 is arranged. Through the pressure cloud chart of the flat-plate type fan blade, the condition that the airflow can not stably pass through the upper surface and the lower surface of the flat plate type fan blade can be observed, and the airflow breaks away from the flat plate very early, so that great resistance is caused.
Based on the defects of the flat-type fan blade, the flat-type fan blade is replaced by a symmetrical wing type with a sharp tail edge, and the symmetrical wing type with the sharp tail edge is specifically shown in fig. 5. The performance of the symmetrical wing profile of the pointed tail edge under the same wind speed condition is observed by the same finite element fluid simulation method. The pressure cloud corresponding to the symmetrical wing profile with the sharp tail edge can observe that the airflow can smoothly pass through the upper surface and the lower surface of the wing profile without advanced separation, so that great resistance is not generated.
However, considering that the tail of the symmetrical airfoil with the pointed tail edge is pointed, the effect of the airfoil shape is difficult to achieve in actual production and manufacturing. Thus, the symmetrical airfoil shape of the blunt trailing edge shown in fig. 1 is employed. In practice, the procedure X-Foil can be used to process a symmetrical airfoil profile with a sharp trailing edge, resulting in a symmetrical airfoil profile with a blunt trailing edge as shown in fig. 1. In practice, the tip is not removed only, but the distance between the upper and lower arcs is simultaneously increased.
The symmetrical wing profile is adopted in the embodiment of the invention because the motor fan can rotate positively and negatively, and the symmetrical wing profile is required to be selected for the wing profile of the blade section.
The relation between the lift coefficient and the drag coefficient of two symmetrical wing profiles of the sharp tail edge and the blunt tail edge is calculated through a program X-Foil, and the lift coefficient is equal to 0 when the attack angle of the wing profile is 0. And it can be observed that the coefficient of drag of the symmetric airfoil with blunt trailing edge is lower than that of the symmetric airfoil with sharp trailing edge when the coefficient of lift is equal to 0. It can be seen that a blunt trailing edge is more effective at reducing drag than a sharp trailing edge.
In one embodiment, the length of the straight section edge can be 5% -10% of the chord length of the symmetrical airfoil. In practice, if the length of the straight line segment edge is too small, the effect of reducing the resistance is comparable to that of a sharp trailing edge, while if the length of the straight line segment edge is too large, approaching a flat shape, it is not desirable. Therefore, experiments are carried out on the length of the edge of the straight line section for many times, and the fact that when the length of the edge of the straight line section is 5% -10% of the chord length of the symmetrical wing section is found that the air flow can smoothly pass through the upper surface and the lower surface of the wing section, and the effect of reducing the resistance is ideal.
In fact, the greater the length of the straight line segment edge, the less difficult the manufacturing process, but the worse the effect of reducing the resistance, etc. Therefore, in the range of 5% -10%, when the length of the edge of the straight line section is 7% of the chord length of the symmetrical airfoil, the straight line section is optimal from the comprehensive aspects of manufacturing process and resistance reduction.
In one embodiment, the lateral width of the fan blade increases from the blunt trailing edge to the insertion position; the embedded position is a position where a rotor shaft of the motor fan is embedded in the fan blade, and the transverse direction of the fan blade is along a direction perpendicular to the axial direction between the plane where the fan blade is located and the blunt trailing edge and the leading edge.
It will be appreciated that when installed, the fan blades are embedded in the rotor shaft of the motor fan, the rotor shaft being the structure that rotates the individual fan blades, see for example reference 200 in the fan shown in FIG. 6. The embedded position of the fan blade can also be called as the mounting position of the fan blade. In particular, the structure shown in fig. 6 can be obtained by performing sweep modeling on the shape shown in fig. 2.
The axial direction refers to the direction of a mean camber line between the blunt trailing edge and the leading edge, the transverse direction refers to the direction perpendicular to the axial direction along the plane of the fan blade, and the transverse width refers to the width of the fan blade in the transverse direction.
It will be appreciated that the lateral width of the fan blades tends to increase from the blunt trailing edge to the insertion position, so that the lateral width of the fan blades at the insertion position is greater, which allows a very secure mounting of the fan blades on the rotor shaft.
Further, the fan blade 100 may have a polygonal outer contour in a plane, the polygon is a hexagonal structure formed by a first side 21, a second side 22, a third side 23, a fourth side 24, a fifth side 25 and a sixth side 26 which are connected in sequence, and the first side 21 is the blunt trailing edge; the angle between the first edge 21 and the second edge 22 and the angle between the second edge 22 and the third edge 23 are obtuse angles, and the embedded position is located on the third edge 23 and the sixth edge 26.
That is, the outer contour of the planar shape of fan blade 100 is a hexagon, as shown in fig. 2. The first edge 21 is a contour edge corresponding to the blunt trailing edge, the included angle between the first edge 21 and the second edge 22 is called a first included angle, and the included angle between the second edge 22 and the third edge 23 is called a second included angle, and is an obtuse angle. Referring to fig. 7, a shape of a fan blade 100 in the prior art is shown, in which the fan blade 100 has no second included angle with respect to the fan blade 100 in fig. 2. Since the fan blade 100 of the embodiment of the present invention has the second included angle, more air can be driven to flow during operation. And because the second included angle exists in the embodiment of the present invention, the first included angle in fig. 2 is larger than the first included angle in fig. 7, so that more air flow can be further driven in operation.
Moreover, since the transverse width between the third edge 23 and the sixth edge 26 is relatively large, the transverse width at the embedded position can be ensured to be relatively large by arranging the embedded position on the third edge 23 and the sixth edge 26, so that the mounting stability of the fan blade 100 is ensured.
Still further, the polygon may have the following features:
the angle between the first edge 21 and the sixth edge 26 is 90 °; the included angle between the first edge 21 and the second edge 22 is equal to the included angle between the second edge 22 and the third edge 23 and ranges from 135 degrees to 145 degrees; the included angle between the sixth side 26 and the fifth side 25 is 90-135 degrees; the angle between the fifth side 25 and the fourth side 24 is 90 °; the angle between the fourth side 24 and the third side 23 is 125 ° -135 °.
It can be appreciated that when the first angle and the second angle are larger, the required size of the rotor shaft 200 is larger, which increases the cost of the fan. If the first included angle and the second included angle are smaller, the effect of driving the air to flow when the fan operates is poorer. Therefore, the first included angle and the second included angle are set to be the same in size and are between 90-135 degrees, so that the size of the required rotor shaft 200 cannot be too large, and the effect of driving air to flow when the fan operates can be guaranteed.
Moreover, the included angle between the fifth side 25 and the fourth side 24 is 90 degrees, so that the area of the fan blade embedded into the rotor shaft 200 can be reduced as much as possible on the basis of larger transverse width of the embedded position, that is, the cost of the fan blade is reduced while the installation stability is ensured.
It can be understood that, after the values or value ranges of the plurality of included angles are determined, the included angle between the sixth side 26 and the fifth side 25 can be set to be in a range of 90 degrees to 135 degrees, and the included angle between the fourth side 24 and the third side 23 can be set to be in a range of 125 degrees to 135 degrees, so as to obtain the polygonal outer profile shown in fig. 2.
In one embodiment, the distance between the symmetrical positions on the upper camber line and the lower camber line of the symmetrical airfoil may be determined in advance according to the maximum thickness, the chord length and the length of the edge of the straight line segment of the symmetrical airfoil.
That is, in the symmetrical airfoil shown in fig. 1, the upper camber line and the lower camber line are symmetrical with respect to the mean camber line, and the distance between the symmetrical positions of the upper camber line and the lower camber line may be determined according to factors such as the maximum thickness, the chord length, the length of the blunt trailing edge, and the like of the symmetrical airfoil, so as to obtain a symmetrical airfoil having a smooth transition.
It will be appreciated that the maximum thickness, chord length, and length of the blunt trailing edge are three key parameters of a symmetrical airfoil from which the shape of the symmetrical airfoil can be roughly determined, but the specific dimensions will require further computational determination.
Further, the distance between the symmetrical positions on the upper arc line and the lower arc line of the symmetrical airfoil profile is calculated by adopting a first calculation formula, wherein the first calculation formula is as follows:
y=
+
wherein y is a distance between symmetrical positions on an upper arc line and a lower arc line at an x abscissa, a transverse axis of a coordinate system adopted by the first calculation formula extends along a chord length direction, a longitudinal axis extends along a direction perpendicular to the chord length, t is a ratio between the maximum thickness and the chord length of the symmetrical airfoil, g is a ratio between the length of an edge of the straight line segment and the chord length, c is the chord length, and n is a continuity control parameter of the symmetrical airfoil,
and the abscissa corresponds to the maximum thickness.
Wherein in fig. 1, the maximum thickness is the thickness between the point B1 and the point B2.
In the first calculation formula, the horizontal axis extends in the chord length direction, and the vertical axis extends in the direction perpendicular to the chord length.
For example, a coordinate system is set with the mean camber line in fig. 1 as the x-axis and the midpoint of the circular arc-shaped leading edge as the origin. Based on this coordinate system, the respective positions on the upper arc may be calculated using the following calculation:
y1=
+
the respective positions on the lower arc may be calculated using the following calculation:
y2=
the first calculation formula can be obtained based on these two calculation formulas.
In the first calculation formula, t and g are both expressed by a ratio, for example, the blunt trailing edge is 7% of the chord length, g is 7%, and the maximum trailing edge is 11% of the chord length, t is 11%, in which case the symmetric airfoil profile may be referred to as NACA 0011. Therefore, the size calculation can be carried out on fan blades with different specifications.
Wherein, in the first calculation formula, the method adopts
The width between the upper arc and the lower arc is expanded, g is the size of the blunt trailing edge, c is the chord length,
for the abscissa corresponding to the maximum thickness, n is a continuity control parameter of the symmetrical profile, thus using
The symmetrical wing section obtained by expanding the width between the upper arc line and the lower arc line has good continuity and is matched with the blunt trailing edge, chord length, maximum thickness and other dimensions.
N is a continuity control parameter of the symmetrical airfoil profile, and is used for controlling the continuity of the upper arc and the lower arc of the symmetrical airfoil profile, and a suitable n value, for example, 1.8, can be selected from 1 to 2.5 according to experience in an actual scene. Of course, calculation using a calculation formula is also possible.
That is, the continuity control parameter may be calculated in advance by using a second calculation formula, where the second calculation formula includes:
in the formula, a is an empirical parameter, and the value range of a is (13, 14).
In the second calculation formula, the chord length, the maximum thickness, and the size of the blunt trailing edge are taken into consideration when calculating the continuity control parameter, and therefore the parameter n calculated by the second calculation formula is more realistic than the value of n selected empirically.
It will be appreciated that the cross-sectional shape of the motor blades currently in use is flat and cannot have any curvature because the fan requires clockwise and anticlockwise rotation. Moreover, the symmetrical wing profile with the sharp trailing edge has great disadvantages for processing and production due to the sharp trailing edge, so that the wing profile used by any motor fan has not been found.
And (3) setting a fluid calculation domain, respectively assembling fans corresponding to blades of the symmetric wing type of the flat plate type, the sharp trailing edge and the symmetric wing type of the blunt trailing edge into a motor (taking FS160-2 as an example), and performing fluid simulation of computational fluid dynamics. The air intake and the loss torque of the motor under the action of the fans with the fan blades of different sections are detected, and then the efficiency coefficients of the three fans are calculated, wherein the efficiency coefficients are the ratio of the air intake to the loss torque. It was found that the efficiency coefficient of the fan corresponding to the flat blade, the efficiency coefficient of the fan corresponding to the symmetrical airfoil shape blade having the sharp rear edge, and the efficiency coefficient of the fan corresponding to the symmetrical airfoil shape blade having the blunt rear edge increase in this order, that is, the efficiency coefficient of the fan corresponding to the symmetrical airfoil shape blade having the blunt rear edge is the largest. It can be seen that the efficiency of the fan corresponding to the fan blade with the symmetrical wing type of the blunt trailing edge is obviously improved.
Furthermore, the polygonal profile shown in fig. 2 is adopted, so that the shape of the fan blade can be optimized, the efficiency of the fan is further improved, and the loss of the fan is reduced. The ventilation performance of the fan is improved, and the competitiveness of the product is improved.
According to the motor fan blade provided by the embodiment of the invention, the section of the fan blade is of a symmetrical wing shape, so that the fan can rotate clockwise and anticlockwise, namely rotate forwards and reversely. Because the symmetrical wing profiles are adopted, the air flow can smoothly pass through the upper surface and the lower surface of the wing profiles, the air flow can not be separated in advance, and the fan blade is more effective in reducing the resistance compared with the fan blades in the prior art. The fan blade provided by the embodiment of the invention can improve the efficiency of the fan, reduce the loss generated by the fan in the running process, further avoid sacrificing some air inlet amount and heat dissipation performance, avoid selecting a fan with a first size, avoid increasing the using amount of enameled wires and reduce the cost. Moreover, the symmetrical airfoil profile is provided with the blunt trailing edge, so that the processing and the production are convenient.
In a second aspect, an embodiment of the present invention provides a motor fan.
Referring to fig. 6, the fan blade assembly includes a rotor shaft 200 and a predetermined number of fan blades embedded on the rotor shaft, where the fan blades are the fan blades 100 of the motor provided in the first aspect.
It can be understood that, for the explanation, the specific implementation, the beneficial effects, the examples and the like of the related contents in the motor fan provided in the embodiment of the present invention, reference may be made to corresponding parts in the motor fan provided in the first aspect, and details are not described herein again.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in this disclosure may be implemented in hardware, software, hardware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.
Claims (6)
1. An electric motor fan blade, characterized in that the cross section of the fan blade (100) is a symmetrical airfoil profile, which comprises an upper arc (11), a middle arc (13) and a lower arc (12), the upper arc (11) and the lower arc (12) are symmetrical with respect to the middle arc (13), the symmetrical airfoil profile has a blunt trailing edge (15), the blunt trailing edge (15) is a straight line edge between the upper arc (11) and the lower arc (12) in the tail of the symmetrical airfoil profile; the length of the edge of the straight line section is 5% -10% of the chord length of the symmetrical airfoil profile, and the chord length is the length of the mean camber line (13);
the transverse width of the fan blade (100) increases from the blunt trailing edge (15) to the embedded position; the embedded position is a position where a rotor shaft (200) of a motor fan is embedded in the fan blade (100), the transverse direction of the fan blade (100) is a direction perpendicular to the axial direction between the blunt trailing edge (15) and the blunt leading edge along the plane where the fan blade (100) is located, wherein the axial direction is the direction where the mean camber line (13) is located;
the distance between symmetrical positions on an upper arc line (11) and a lower arc line (12) of the symmetrical wing profile is calculated by adopting a first calculation formula, wherein the first calculation formula is as follows:
y=
+
wherein y is the distance between symmetrical positions on an upper arc line (11) and a lower arc line (12) at the x position of an abscissa, a transverse axis of a coordinate system adopted by the first calculation formula extends along the chord length direction, a longitudinal axis extends along the direction vertical to the chord length, t is the ratio between the maximum thickness and the chord length of the symmetrical airfoil profile, g is the ratio between the length of the edge of the straight line segment and the chord length, c is the chord length, and n is the continuity control parameter of the symmetrical airfoil profile,
and the abscissa corresponds to the maximum thickness.
2. The fan blade according to claim 1, wherein the fan blade (100) has a polygonal outer contour in a plane, the polygon is a hexagonal structure formed by a first edge (21), a second edge (22), a third edge (23), a fourth edge (24), a fifth edge (25) and a sixth edge (26) which are connected in sequence, the first edge (21) is the blunt trailing edge (15), an included angle between the first edge (21) and the second edge (22) and an included angle between the second edge (22) and the third edge (23) are obtuse angles, and the embedding position is located on the third edge (23) and the sixth edge (26).
3. The fan blade according to claim 2, wherein the angle between the first edge (21) and the sixth edge (26) is 90 °; the included angle between the first side (21) and the second side (22) is equal to the included angle between the second side (22) and the third side (23) and is between 135 degrees and 145 degrees; the included angle between the sixth side (26) and the fifth side (25) is 90-135 degrees; the angle between the fifth edge (25) and the fourth edge (24) is 90 degrees; the angle between the fourth edge (24) and the third edge (23) is 125 DEG-135 deg.
4. Fan blade according to claim 1, characterized in that the distance between the symmetrical positions on the camber line (11) and the camber line (12) of said symmetrical profile is predetermined according to the maximum thickness of said symmetrical profile, the chord length and the length of the edge of said straight section.
5. The fan blade according to claim 1, wherein the continuity control parameter is calculated in advance using a second calculation formula, and the second calculation formula includes:
in the formula, a is an empirical parameter, and the value range of a is (13, 14).
6. A motor fan is characterized by comprising a rotor shaft (200) and a preset number of fan blades embedded on the rotor shaft (200), wherein the fan blades are the motor fan blades (100) as claimed in any one of claims 1 to 5.
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| CN203374517U (en) * | 2013-08-13 | 2014-01-01 | 卧龙电气集团股份有限公司 | Fan with right-angle trapezoid-shaped blades |
| GB2523133B (en) * | 2014-02-13 | 2016-06-01 | X-Wind Power Ltd | Vertical axis wind turbine rotor and aerofoil |
| CN108361224A (en) * | 2018-03-14 | 2018-08-03 | 上海交通大学 | The equivalent axial flow blower aerofoil profile of forward and reverse rotation aerodynamic property retention |
| CN112797022B (en) * | 2020-12-21 | 2022-06-28 | 珠海格力电器股份有限公司 | Fan blade assembly and motor with same |
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