Axial flow cooling fan assembly structure

Abstract

The present invention discloses an axial flow cooling fan assembly structure, which includes an impeller, a hood connection mechanism and a motor, wherein the impeller is assembled in the hood connection mechanism through the motor; the impeller includes a hub, blades and a wind shield, the root of the blade is connected to the hub, and the top is connected to the wind shield; the hood connection mechanism includes a wind shield, ribs and a motor connection cover; the root of the ribs is connected to the motor connection cover, and the top is connected to the wind shield; the ribs include a plurality of airflow guiding ribs, the cross section of the airflow guiding ribs is an airfoil shape, and has a twisted structure relative to the radial direction; the rear end of the motor is installed in the motor connection cover, and the front end of the motor's rotating shaft is coaxially connected to the hub. The axial flow cooling assembly structure of the present invention has many advantages such as large flow rate, good heat dissipation effect and sound quality.

Description

Technical Field

[0001] The invention belongs to the technical field of engine cooling fans, and in particular relates to an axial flow cooling fan assembly structure. Background Art

[0002] At present, conventional engine cooling fans have the following disadvantages:

[0003] 1. The surface of conventional blades is smooth and can meet the flow and noise requirements. However, the order noise value of this structure is too large, the total sound pressure level is too high, and the sound quality is not ideal.

[0004] 2. Conventional fan hood ribs are arranged at the blade outlet to support the motor and strengthen the structural strength. However, inappropriate arrangement and rib structure have a certain negative impact on the outlet flow, resulting in low overall fan efficiency and reduced sound quality.

[0005] 3. The motor of a conventional fan is assembled with the wind cover through a motor cover structure. The motor cover structure can ensure the supporting strength and prevent foreign matter from entering the motor, but it can also cause the problem of high heat generation. Summary of the invention

[0006] In view of the technical problems that conventional engine cooling fans have low flow, unsatisfactory sound quality and heat dissipation effect, the purpose of the present invention is to provide an axial flow heat dissipation assembly structure with large flow, good heat dissipation effect and sound quality.

[0007] The axial flow cooling fan assembly structure of the present invention comprises an impeller, a fan cover connection mechanism and a motor, wherein the impeller is assembled in the fan cover connection mechanism through the motor; and is characterized in that:

[0008] The impeller comprises a hub, blades and a wind shielding ring, the roots of the blades are connected to the hub and are radially extended outward around the hub, and the tops of the blades are connected to the wind shielding ring;

[0009] The wind shield connection mechanism includes a wind shield, ribs and a motor connection shield; the root of the ribs is connected to the motor connection shield and is radially extended outward around the motor connection shield, the top of the ribs is connected to the wind shield, and the wind shield as the outer shell of the overall structure cooperates with the wind shield ring in a non-contact manner; the ribs include a plurality of airflow guiding ribs, the cross section of the airflow guiding ribs is an airfoil shape, and has a twisted structure relative to the radial direction;

[0010] The rear end of the motor is installed in the motor connection cover, and the front end of the rotating shaft of the motor is coaxially connected to the wheel hub.

[0011] In the present application, the cross section refers to an arc-shaped cutting surface with the central axis of the assembly structure (including the axis of the hub and the axis of the motor connection cover) as the axis, and the same applies below.

[0012] In the impeller,

[0013] Preferably, the number of blades is 7, and they are unequally distributed around the hub; the angle formed by the vertical line connecting the midpoints of the roots of adjacent blades and the centerline of the hub is recorded as the blade spacing angle, and based on the running direction during operation, the blade spacing angles are 55-56°, 54-56°, 53-54°, ​​43-44°, 60-61°, 60-61°, 48-49°, and 47-48°, respectively.

[0014] Preferably, the cross section of each blade is an airfoil shape.

[0015] Preferably, each blade has a forward curved structure relative to the radial direction.

[0016] From the blade root to the blade tip, the blade can be seen as a number of blade segments stacked along a specific curve. The specific curve is called the blade stacking line. The blade stacking line connects the center of gravity of all blade segments. The blade stacking line reflects the bending direction of the blade extending radially from the root. Taking the blade stacking method as the independent variable of the structural design, the parametric modeling of the swept blade can be realized.

[0017] In some preferred embodiments of the present invention, the centroid of the blade root section is taken as the origin, a model is built in a plane perpendicular to the axis of the hub, the blade radial direction is taken as the x direction, and the direction orthogonal to the x direction is taken as the y direction. The centroid stacking line equation of the blade is:

[0018] y=0.013x 3 -0.0173x 2 +0.592x.

[0019] Preferably, each blade is installed at an inclination, and the angle formed by the cross-sectional chord line of each blade and the centerline of the hub is the blade inclination angle. From the root to the top of the blade, the blade inclination angles at 11 equally spaced cross sections (including the cross sections at the root and top of the blade) are 67-68°, 69-70°, 71-72°, 72-73°, 73-74°, 74-75°, 74-75°, 74-75°, 74-75°, 74-75°, 73-74°, respectively; the cross-sectional chord line refers to the line connecting the leading edge point and the trailing edge point of any cross section of the blade.

[0020] Preferably, the hub is provided with a plurality of flat slots.

[0021] Furthermore, the flat slots are unevenly distributed circumferentially; the size and number of the flat slots can also be adjusted to ensure the air volume while the large amount of heat generated by the motor can be partially dissipated through the flat slots.

[0022] Preferably, an annular groove is provided on the circumference of the surface of the hub, and the annular groove can enhance the strength of the blade root, so that the balance state of the blade is more stable when the blade rotates.

[0023] In the wind shield connecting mechanism,

[0024] Preferably, three motor assembly holes are provided around the motor connection cover and are equipped with bolts for installing the motor, and the ribs also include three supporting guide ribs, the roots of the three supporting guide ribs are respectively connected to the three motor assembly holes, the cross-section of the supporting guide ribs is a flared U-shape, and the extension lines of the supporting guide ribs intersect in pairs and do not converge at the center of rotation.

[0025] Preferably, the total number of the ribs is 1.5 to 1.9 times the total number of the blades; and the ribs are distributed at unequal intervals around the motor connection cover.

[0026] Preferably, the number of the airflow guiding ribs is 10; plus 3 of the supporting guide ribs, there are a total of 13 ribs, and the angle formed by the vertical line connecting the midpoints of the roots of adjacent ribs and the axis of the motor connecting cover is recorded as the rib spacing angle, and the rib spacing angles are 30-31°, 40-41°, 27-28°, 23-24°, 32-33°, 27-28°, 27-28°, 31-32°, 24-25°, 27-28°, 27-28°, 19-20°, and 20-21° respectively.

[0027] From the root to the top of the rib, the airflow guiding rib can be regarded as a number of rib segments stacked along a specific curve. The specific curve is called the rib stacking line. The rib stacking line connects the centers of gravity of all rib segments. The rib stacking line reflects the radial extension and bending direction of the airflow guiding rib from the root. Taking the rib stacking method as the independent variable of the structural design, the parametric modeling of the curved airflow guiding ribs can be realized.

[0028] In some preferred embodiments of the present invention, the centroid of the root section of the airflow guiding rib is taken as the origin, and a model is built in a plane perpendicular to the axis of the motor connection cover, with the radial direction of the rib as the x direction and the direction orthogonal to the x direction as the y direction. The centroid stacking line equation of the airflow guiding rib is:

[0029] y=-0.004x 4 -0.21x 3 -2.746x 2 -20.8x.

[0030] Preferably, the airflow guiding ribs are installed at an angle, and the angle formed by the cross-sectional chord line of each part of the airflow guiding rib and the axial center line of the motor connecting cover is the rib inclination angle. From the root to the top of the rib, the rib inclination angles at 11 equally spaced cross sections (including the cross sections at the root and top of the rib) are 35-36°, 31-32°, 26-27°, 24-25°, 26-27°, 27-28°, 30-31°, 36-37°, 42-43°, 51-52°, and 61-62° respectively; the cross-sectional chord line refers to the line connecting the leading edge point and the trailing edge point of the cross section at any part of the rib.

[0031] Preferably, the motor connection cover is provided with a plurality of bosses along the circumferential direction, and the bosses are provided with flow flat holes leading to the outside of the cover.

[0032] The axial flow cooling fan assembly structure of the present invention has the following advantages and characteristics:

[0033] 1. The blades are forward-curved, requiring less power and having greater flow efficiency; the seven blades are unevenly distributed around the hub to improve the distribution of discrete noise in the noise spectrum; the blade surface is treated with a second-order continuous multi-surface modification, which can reduce the seventh-order noise value and comprehensively improve the sound quality, so that the fan noise meets customer requirements.

[0034] 2. In the impeller, the wind shield is connected to the blade tip. When the blade is working, the wind shield rotates with the blade, reducing the deformation and vibration of the blade caused by the rotation. At the blade tip with a higher speed, a shedding vortex such as a blade tip vortex will be generated. The wind shield and the wind shield cooperate with each other to form an inner cavity at a certain axial and radial distance, which weakens the vortex generation at the blade tip to a certain extent, blocks the low-energy backflow from merging into the mainstream, and improves the flow efficiency of the blade.

[0035] 3. Flat slots are designed on the hub. The size, number and distribution of the flat slots can be adjusted to ensure the air volume while the large heat generated by the motor can be partially dissipated through the slots. The hub surface is designed with an annular groove in the circumference, which can strengthen the strength of the blade root and make the blade more stable when rotating.

[0036] 4. The wind shield serves as the outer shell of the overall structure, blocking some foreign matter from entering the interior of the structure while also serving as an external support. An inner cavity is formed at a certain distance in the axial and radial directions, reducing the reflux of low-energy fluid at the blade top into the mainstream.

[0037] 5. The airflow guide ribs are unevenly distributed circumferentially on the motor connection cover, playing the role of rear guide vanes. The radial section of the ribs is designed to be airfoil-shaped. The installation angle of the ribs is designed according to the airflow angle of the fan blade outlet to recover the wake static pressure. Compared with the working condition without such ribs, the fan flow with such rear guide vanes is larger. The support guide ribs are directly connected to the motor mounting holes, and the radial section of the ribs is designed to be a flared U-shaped, taking into account both support and guide functions.

[0038] 6. The motor connection cover connects the motor and the outer shell of the fan cover to prevent foreign matter from entering the motor. The boss design increases the heat dissipation area, and the flat mouth design increases the heat dissipation flow inside the cover.

[0039] In summary, the axial flow heat dissipation assembly structure of the present invention has many advantages such as large flow rate, good heat dissipation effect and sound quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 and Figure 2 It is a three-dimensional schematic diagram of the assembly structure of the axial flow cooling fan of the present invention;

[0041] Figure 3 It is a front schematic diagram of the axial flow cooling fan assembly structure of the present invention;

[0042] Figure 4 for Figure 3 An enlarged schematic diagram of the middle wheel hub;

[0043] Figure 5 It is a schematic diagram of the back side of the axial flow cooling fan assembly structure of the present invention;

[0044] Figure 6 for Figure 5 An enlarged schematic diagram of the motor connection cover;

[0045] Figure 7 for Figure 3 Sectional view of the middle BB plane;

[0046] Figure 8 for Figure 7 The enlarged schematic diagram of C1 in the middle;

[0047] Fig. 9 for Figure 7 The enlarged schematic diagram of C2 in the middle;

[0048] Figure 10a-10c Schematic diagram of 11 equally spaced cross sections of blades and airflow guide ribs of the present invention, with the left side being fan blades and the right side being guide ribs;

[0049] Fig.11 It is a schematic diagram of the cross section of the supporting guide ribs of the present invention.

[0050] Reference numerals

[0051] Impeller 1, hub 11, flat slot 111, annular groove 112, blade 12, wind shield 13; wind cover connecting mechanism 2, motor connecting cover 21, motor assembly hole 211, boss 212, rib 22, air flow guide rib 22a, support guide rib 22b, wind shield 23; motor 3. DETAILED DESCRIPTION

[0052] The present invention will be further described below in conjunction with specific examples. It should be understood that the following examples are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0053] Example 1

[0054] Figure 1 and Figure 2 A preferred axial flow cooling fan assembly structure of the present invention is shown, which includes an impeller 1, a fan cover connecting mechanism 2 and a motor 3. The impeller 1 is assembled in the fan cover connecting mechanism 2 through the motor 3.

[0055] like Figure 3 As shown, the impeller 1 includes a hub 11 , blades 12 and a wind shielding ring 13 . The roots of the blades 11 are connected to the hub 12 and are arranged to extend radially outward around the hub. The tops of the blades 12 are connected to the wind shielding ring 13 .

[0056] like Figure 4 As shown, the hub 11 is provided with a plurality of flat slots 111, which are unevenly distributed circumferentially; the size and number of the flat slots 111 can also be adjusted to ensure the air volume while allowing the large heat generated by the motor to be partially dissipated through the flat slots. The surface of the hub 11 is provided with an annular groove 112 (see also Figure 7 and Fig. 9 ), the annular groove 112 can enhance the strength of the blade root, and the blade is in a more stable balance state when rotating.

[0057] The number of blades 12 is 7 and they are unequally spaced around the hub 11; the angle formed by the vertical line between the midpoints of the roots of adjacent blades and the axis of the hub (such as Figure 3 The angle A1 in the figure is recorded as the blade spacing angle, and the direction of rotation during operation ( Figure 3 Based on the direction of the turning arrow in the middle (clockwise), the blade interval angles are 55-56°, 54-56°, 53-54°, ​​43-44°, 60-61°, 60-61°, 48-49°, and 47-48° respectively.

[0058] The cross section of the blade 11 is an airfoil shape, and each blade 11 has a forward curved structure relative to the radial direction.

[0059] From the blade root to the blade tip, the blade can be seen as a number of blade segments stacked along a specific curve. The specific curve is called the blade stacking line. The blade stacking line connects the center of gravity of all blade segments. The blade stacking line reflects the bending direction of the blade extending radially from the root. Taking the blade stacking method as the independent variable of the structural design, the parametric modeling of the swept blade can be realized.

[0060] Specifically, the centroid of the blade root section is taken as the origin, and the model is built in a plane perpendicular to the axis of the hub. The blade radial direction is the x direction, and the direction orthogonal to the x direction is the y direction. The centroid stacking line equation of the blade is:

[0061] y=0.013x 3 -0.0173x 2 +0.592x.

[0062] Take 11 concentric cross sections F1 from the blade root to the blade tip (such as Figure 4 As shown, including the cross section of the blade root and top), the cross section radius at the blade root r1 = 85.2mm, the cross section radius at the blade top r 11 =216.6mm, equal intercept △r=13.25mm.

[0063] like Figure 10a-Figure 10c As shown in the figure, the chord lengths of the 11 concentric cross sections from the blade root to the blade tip are a 11 =62~64mm, a 21 =62~63mm, a 31 =62~63mm, a 41 =62~63mm, a 51 =62~63mm, a 61 =61~62mm, a 71 =61~62mm, a 81 =61~62mm, a 91 =61~62mm, a 101 =64~65mm, a 111 =67~68mm.

[0064] Each blade 11 is installed at an inclination, and the angle between the chord length of the blade section at each location and the hub axis is the inclination angle. From the root to the top of the blade, the blade inclination angles at the 11 concentric cross sections are a and b. 12 =67~68°, a 22 =69~70°, a 32 =71~72°, a 42 =72~73°, a 52 =73~74°, a 62 =74~75°, a 72 =74~75°, a82 =74~75°, a 92 =74~75°, a 102 =74~75°, a 112 =73~74°; the cross-sectional chord line refers to the line connecting the leading edge point and the trailing edge point of any cross section of the blade.

[0065] like Figure 5 As shown, the wind shield connection mechanism 2 includes a motor connection cover 21, ribs 22 and a wind shield 23. Figure 6 As shown, three motor assembly holes 211 are arranged around the motor connection cover 21 and are equipped with bolts for fixing the motor 3. Figure 7 As shown, the rear end of the motor 3 is installed in the motor connection cover 21, and the front end of the rotating shaft of the motor 3 is coaxially connected to the wheel hub 11. The motor connection cover 21 is provided with eight bosses 212 along the circumference, and the bosses 212 are provided with flow holes outside the cover. The root of the rib 22 is connected to the motor connection cover 21 and is arranged to extend radially outward around the motor connection cover. The top of the rib 22 is connected to the wind shield 23. The wind shield 23, as the shell of the integral structure, cooperates with the wind shield ring 13 in a non-contact manner, as shown in FIG. Figure 8 As shown, a certain distance d1 and d2 are reserved between the outer ring of the wind protection ring 13 and the inner ring of the wind protection cover 23 in both radial and axial directions.

[0066] There are 13 ribs 22, including 10 airflow guide ribs 22a with a cross section of an airfoil shape and 3 supporting guide ribs 22b with a flared U-shaped cross section. The ribs 22 are unequally distributed around the motor connection cover, with the angle formed by the vertical line connecting the midpoint of the root of the adjacent ribs and the axis of the motor connection cover (such as Figure 5 The angle A2 in the figure is recorded as the rib spacing angle. Figure 5 Based on the clockwise direction (the opposite direction of the impeller during operation), the rib spacing angles are 30-31°, 40-41°, 27-28°, 23-24°, 32-33°, 27-28°, 27-28°, 31-32°, 24-25°, 27-28°, 27-28°, 19-20°, and 20-21°.

[0067] From the root to the top of the rib, the airflow guiding rib can be regarded as a number of rib segments stacked along a specific curve. The specific curve is called the rib stacking line. The rib stacking line connects the centers of gravity of all rib segments. The rib stacking line reflects the radial extension and bending direction of the airflow guiding rib from the root. Taking the rib stacking method as the independent variable of the structural design, the parametric modeling of the curved airflow guiding ribs can be realized.

[0068] Specifically, the centroid of the root section of the airflow guiding rib 22a is taken as the origin, and a model is built in a plane perpendicular to the axis of the motor connection cover, with the radial direction of the rib as the x direction and the direction orthogonal to the x direction as the y direction. The centroid stacking line equation of the airflow guiding rib is:

[0069] y=-0.004x 4 -0.21x 3 -2.746x 2 -20.8x.

[0070] The airflow guide rib 22a is installed at an angle and has a twisted structure relative to the radial airflow guide rib. Eleven concentric cross sections F2 are taken at equal distances from the root of the airflow guide rib 22a (close to the motor connection cover) to the top (close to the wind shield). The airfoil section is cut to the trailing edge, such as Figures 10a to 10c As shown, from the root to the top, the cross-sectional chord lengths of the 11 concentric cross sections F2 of the airflow guiding rib 22a are b and 11 =24~25mm, b 21 =22~23mm, b 31 =21~22mm, b 41 =21~22mm, b 51 =21~22mm, b 61 =22~23mm, b 71 =22~23mm, b 81 =23~24mm, b 91 =24~25mm, b 101 =24~25mm, b 111 =26~28mm.

[0071] The airflow guide rib 22a is installed obliquely and has a twisted structure relative to the radial airflow guide rib. The angle formed by the cross-sectional chord length line of each part of the airflow guide rib and the axis of the motor connection cover is the rib inclination angle. From the root to the top of the rib, the rib inclination angles at 11 equally spaced cross sections (including the cross sections at the root and top of the rib) are b 12 =35~36°, b 22 =31~32°, b 32 =26~27°, b 42 =24~25°, b 52 =26~27°, b 62 =27~28°, b 72 =30~31°, b 82 =36~37°, b 92 =42~43°, b 102 =51~52°, b 112=61~62°. The cross-sectional chord line refers to the line connecting the leading edge point and the trailing edge point of any cross section of the rib.

[0072] The roots of the three supporting guide ribs 22b are connected to the three motor assembly holes 211 respectively, and the extension lines of the supporting guide ribs 22b intersect each other and do not converge at the rotation center. Fig.11 As shown, it is a flared U-shape, taking into account both support and diversion functions.

[0073] The axial flow cooling fan assembly structure of the present invention has the following advantages and characteristics:

[0074] 1. If Figure 3 As shown in the figure, the blades are forward-curved, the power required by the blades is small, and the flow efficiency is large; the 7 blades are unevenly distributed around the hub, which improves the clustering distribution of discrete noise in the noise spectrum; the blade surface is treated with a second-order continuous multi-surface modification, which can reduce the noise value of the seventh order, comprehensively improve the sound quality, and the fan noise meets customer requirements.

[0075] 2. If Figure 3 As shown, in the impeller, the wind shield 13 is connected to the blade tip of the blade 11. When the blade 11 is working, the wind shield 13 rotates with the blade 11, reducing the deformation and vibration of the blade caused by the rotation. At the blade tip with a higher speed, a shedding vortex such as a blade tip vortex will be generated. The wind shield 13 and the wind shield 23 cooperate with each other to form an inner cavity at a certain axial and radial distance, which weakens the vortex generation at the blade tip to a certain extent, blocks the low-energy backflow from merging into the mainstream, and improves the flow efficiency of the blade.

[0076] 3. If Figure 4 As shown, a flat slot 111 is designed on the hub 11. The size, number and distribution of the flat slot 111 can be adjusted to ensure the air volume while the large heat generated by the motor can be partially dissipated through the slot. An annular groove 112 is also designed on the circumference of the hub surface. The groove can strengthen the strength of the blade root, and the balance state of the blade is relatively stable when it rotates.

[0077] 4. If Figure 1 and 2 As shown, the wind shield structure serves as the outer shell of the overall structure, blocking some foreign matter from entering the interior of the structure while also serving as an external support, forming an inner cavity at a certain distance in the axial and radial directions, thereby reducing the reflux of low-energy fluid at the blade top into the mainstream.

[0078] 5. If Figure 2As shown, the airflow guide ribs 22a are unevenly distributed around the motor connection cover, playing the role of rear guide vanes. The radial cross-section of the ribs is designed to be airfoil-shaped. The installation angle of the ribs is designed according to the airflow angle of the fan blade outlet to recover the wake static pressure. Compared with the working condition without such ribs, the fan flow with such rear guide vanes is larger. The support guide ribs 22b are directly connected to the motor mounting holes. The radial cross-section of the ribs is designed to be a flared U-shaped, taking into account both the support and guide functions.

[0079] 6. If Figure 2 As shown, the motor connection cover 21 connects the motor and the fan housing to prevent foreign matter from entering the motor. The boss design increases the heat dissipation area, and the flat mouth design increases the heat dissipation flow in the cover.

[0080] In summary, the axial flow heat dissipation assembly structure of the present invention has many advantages such as large flow rate, good heat dissipation effect and sound quality.

[0081] The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without departing from the innovation of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An axial flow cooling fan assembly structure, comprising an impeller, a fan cover connection mechanism and a motor, wherein the impeller is assembled in the fan cover connection mechanism through the motor; characterized in that: The impeller comprises a hub, blades and a wind shield, the root of the blade is connected to the hub and radially extends outward around the hub, and the top of the blade is connected to the wind shield; the wind shield connection mechanism comprises a wind shield, ribs and a motor connection cover; the root of the rib is connected to the motor connection cover and radially extends outward around the motor connection cover, the top of the rib is connected to the wind shield, and the wind shield as the outer shell of the overall structure cooperates with the wind shield in a non-contact manner; the rib comprises a plurality of airflow guiding ribs, the cross section of the airflow guiding rib is an airfoil shape, and has a twisted structure relative to the radial direction; The rear end of the motor is installed in the motor connection cover, and the front end of the motor shaft is coaxially connected to the hub; the hub is provided with a plurality of flat slots; the surface of the hub is circumferentially provided with an annular groove; the motor connection cover is circumferentially provided with a plurality of bosses, and the bosses are provided with flow flat holes outside the cover; three motor assembly holes are provided around the motor connection cover and are equipped with bolts for installing the motor, and the ribs also include three supporting guide ribs, the roots of the three supporting guide ribs are respectively connected to the three motor assembly holes, the cross-section of the supporting guide ribs is a flared U-shape, and the extension lines of the supporting guide ribs intersect each other and do not converge at the rotation center; the number of blades is 7, and they are unequally distributed around the hub; the cross-section of each blade is an airfoil shape, and each blade has a forward curved structure relative to the radial direction; the total number of ribs is 1.5 to 1.9 times the total number of blades; the ribs are unequally distributed around the motor connection cover.

2. The axial flow cooling fan assembly structure according to claim 1, characterized in that: The angle formed by the perpendicular line between the midpoints of the roots of adjacent blades and the centerline of the hub is recorded as the blade interval angle. Based on the operating direction during operation, the blade interval angles are 55~56°, 54~56°, 53~54°, 43~44°, 60~61°, 60~61°, 48~49°, and 47~48° respectively.

3. The axial flow cooling fan assembly structure according to claim 1 or 2, characterized in that: Each blade is installed at an inclination, and the angle formed by the cross-sectional chord line of each blade and the hub axis centerline is the blade inclination angle. From the root to the top of the blade, the blade inclination angles at 11 equally spaced cross sections are 67~68°, 69~70°, 71~72°, 72~73°, 73~74°, 74~75°, 74~75°, 74~75°, 74~75°, 74~75°, 73~74° respectively; the cross-sectional chord line refers to the line connecting the leading edge point and the trailing edge point of any cross section of the blade.

4. The axial flow cooling fan assembly structure according to claim 1, characterized in that: The number of the airflow guiding ribs is 10; the angle formed by the vertical line connecting the midpoints of the roots of adjacent ribs and the axis of the motor connecting cover is recorded as the rib spacing angle, and the rib spacing angles are 30~31°, 40~41°, 27~28°, 23~24°, 32~33°, 27~28°, 27~28°, 31~32°, 24~25°, 27~28°, 27~28°, 19~20°, and 20~21° respectively.

5. The axial flow cooling fan assembly structure according to claim 1, characterized in that: The airflow guiding ribs are installed at an angle, and the angle formed by the cross-sectional chord line of each part of the airflow guiding rib and the axial center line of the motor connecting cover is the rib inclination angle. From the root to the top of the rib, the rib inclination angles at 11 equally spaced cross sections are 35~36°, 31~32°, 26~27°, 24~25°, 26~27°, 27~28°, 30~31°, 36~37°, 42~43°, 51~52°, and 61~62° respectively; the cross-sectional chord line refers to the line connecting the leading edge point and the trailing edge point of any cross section of the rib.

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