Hub structure of diagonal fan

Abstract

According to the hub structure of the oblique flow fan, a hub gap exists between a hub and a motor; the contour line of the outer surface of the hub is in a sine function curve shape. A cooling pressure stabilizing groove is formed in the air outlet side of the hub and is formed in the inner side of the hub; the hub is connected with a motor rotating shaft through a supporting ring; cooling ventilation holes are formed in the supporting ring; the inner side face of the hub is an annular face, two rows of blades are arranged on the annular face at intervals, the blades on the inlet side are long blades, the blades on the outlet side are short blades, and the long blades and the short blades are evenly arranged on the annular face. A windward side groove is formed in the peripheral surface of the hub; a drainage pressurizing pipe is arranged in the hub and comprises a horizontal channel and an inclined channel, an inlet of the horizontal channel is located in the radial face of the groove, and an outlet of the inclined channel is located between the long blades and the short blades. Due to the fact that the structure of the oblique flow fan is improved, the heat dissipation characteristic is improved, noise is reduced, and conveying efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a hub structure of an axial-flow fan, in particular to a hub structure with good heat dissipation effect, reduced wind resistance and noise. Background Art

[0002] An axial-flow fan is a fluid machine that has a plurality of rotating blades arranged radially around a hub and blows air in multiple directions of the rotating blades while rotating through a motor or the like, thereby promoting the heat dissipation of an air-cooled heat exchanger such as an electric fan, an exhaust fan for ventilation, a radiator or a condenser of an automobile. Along with the development of products such as life production towards intensification and high power, the demand for ventilation and heat dissipation is increasing day by day, and the ventilation performance of axial-flow fans has attracted more and more attention. Therefore, it is particularly important to carry out design and research on the improvement of the characteristics of axial-flow fans.

[0003] The prior art CN107816454A discloses an impeller of an axial-flow fan. Radially from the inside to the outside, the hub main body includes a wheel core joint part 311, a hub root 312, a hub web 313 and a flange edge 314. The wheel core joint part is in a cylindrical structure and wraps around the wheel core. A concave part 32 matching the convex part 42 on the wheel core is arranged on the radial inner wall of the cylindrical wheel core joint part. The hub root protrudes from the outer surface of the wheel core joint part and is used to connect the hub web arranged along the radial direction of the hub. The hub web is a whole disc-shaped structural plate. The positioning part 316 of the flange edge is arranged on the radial outer edge of the hub web. The flange is aligned with the hub web along the radial direction of the hub and their thicknesses are equal. The surface of the flange 21 near the air inlet end is flush with the surface of the hub web 313 near the air inlet end. The concave part 32 is aligned with the hub web 313 and the hub root along the radial direction of the hub, so that the concave part is aligned with the hub root along the radial direction of the hub. On the one hand, the strength of the impeller is fully guaranteed. On the other hand, it is avoided that the thickness of the wheel core joint part needs to be additionally increased due to the setting of the concave part, effectively reducing the weight of the hub and making the solid part of the hub 3 be utilized most reasonably, saving materials.

[0004] However, the above-mentioned fans all have limitations in design, poor adaptability, high power consumption, unstable air volume, low heat dissipation efficiency, high noise and strong vibration. Therefore, in view of these problems, the applicant proposes a hub structure of an axial-flow fan to solve the above-mentioned problems to improve the heat dissipation characteristics, reduce the wind resistance and noise of the impeller, and thus improve the air outlet effect and efficiency. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the disadvantages existing in the prior art and propose a hub structure of an axial-flow fan.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A hub structure of an axial - flow fan, where the hub 2 is connected to the motor 1, the blades 4 are installed on the hub 2, and the outer edge of the blade 4 is fixed to the inner side of the impeller ring 3; it is characterized in that: there is a hub gap 5 between the hub 2 and the motor 1; the outer surface contour line of the hub 2 is in the shape of a sine - function curve; the air - outlet side of the hub 2 has a cooling and pressure - stabilizing groove 6, and the cooling and pressure - stabilizing groove 6 is arranged on the inner side of the hub 2; the hub 2 is connected to the rotating shaft of the motor 1 through a support ring 7; there are cooling ventilation holes 71 on the support ring 7; the inner side surface of the hub 2 is a toroidal surface, and two rows of blades are arranged at intervals on the toroidal surface. The blades on the inlet side are long blades 81, and the blades on the outlet side are short blades 82. The long blades 81 and the short blades 82 are evenly arranged on the toroidal surface; there is a wind - facing groove 9 on the outer circumferential surface of the hub 2, and the wind - facing groove 9 includes a groove circumferential surface 91 and a groove radial surface 92; a flow - guiding and pressure - increasing pipe 10 is arranged inside the hub 2, and the flow - guiding and pressure - increasing pipe 10 includes a horizontal channel 101 and an inclined channel 102. The inlet of the horizontal channel 101 is located on the groove radial surface 92, and the outlet of the inclined channel 102 is located between the long blades 81 and the short blades 82; the long blades 81 and the short blades 82 are arranged staggeredly in the axial direction. The long blades 81 are three - dimensional twisted blades, and the short blades 82 are straight - plate blades; the included angle formed at the connection of the horizontal channel 101 and the inclined channel 102 is an obtuse angle; the cooling ventilation holes 71 are arranged in a circumferential array on the support ring 7.

[0008] Further, the included angle formed at the connection of the horizontal channel 101 and the inclined channel 102 is 116° - 166°.

[0009] Further, the cross - section of the wind - facing groove 9 is a triangular structure.

[0010] Further, the number ratio of the long blades 81 to the short blades 82 is 1:2.

[0011] Further, the axial length of the long blade 81 is A, and the axial length of the short blade 82 is B, where A:B = 1.2 - 1.6.

[0012] Further, the radial height of the long blade 81 is a, and the radial height of the short blade 82 is b, where a:b = 1.1 - 1.3.

[0013] Further, the number of the short blades 82 is equal to the number of the cooling ventilation holes 71.

[0014] Further, the short blades 82 and the cooling ventilation holes 71 are in one - to - one correspondence in the axial position.

[0015] Further, the number of the long blades 81 is equal to the number of the blades 4.

[0016] Further, the long blades 81 and the blades 4 are in one - to - one correspondence in the radial position.

[0017] A hub structure of an axial - flow fan of the present utility model, there is a hub clearance 5 between the hub 2 and the motor 1; the outer surface contour line of the hub 2 is in the shape of a sine function curve; the air - outlet side of the hub 2 has a cooling and pressure - stabilizing groove 6, and the cooling and pressure - stabilizing groove 6 is arranged inside the hub 2; the hub 2 is connected to the rotating shaft of the motor 1 through a support ring 7; cooling ventilation holes 71 are provided on the support ring 7; the inner side surface of the hub 2 is a toroidal surface, and two rows of blades are arranged at intervals on the toroidal surface. The blades on the inlet side are long blades 81, and the blades on the outlet side are short blades 82. The long blades 81 and the short blades 82 are evenly arranged on the toroidal surface; there is a wind - facing groove 9 on the outer peripheral surface of the hub 2, and the wind - facing groove 9 includes a groove circumferential surface 91 and a groove radial surface 92; a flow - guiding and pressure - increasing pipe 10 is arranged inside the hub 2, and the flow - guiding and pressure - increasing pipe 10 includes a horizontal channel 101 and an inclined channel 102. The inlet of the horizontal channel 101 is located on the groove radial surface 92, and the outlet of the inclined channel 102 is located between the long blades 81 and the short blades 82; the long blades 81 and the short blades 82 are arranged staggeredly in the axial direction. The long blades 81 are three - dimensional twisted blades, and the short blades 82 are straight - plate blades; the included angle formed at the connection of the horizontal channel 101 and the inclined channel 102 is an obtuse angle; the cooling ventilation holes 71 are arranged in a circumferential array on the support ring 7. Due to the improvement of the axial - flow fan structure, the heat - dissipation characteristics are improved, the noise is reduced, and the conveying efficiency is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the axial - flow fan structure;

[0019] Figure 2 is a cross - sectional view of the axial - flow fan;

[0020] Figure 3 is a schematic diagram of the dimensional relationship between the long blades 81 and the short blades 82.

[0021] In the figure: motor 1, hub 2, impeller ring 3, blade 4, hub clearance 5, cooling and pressure - stabilizing groove 6, support ring 7, cooling ventilation hole 71, long blade 81, short blade 82, wind - facing groove 9, groove circumferential surface 91, groove radial surface 92, flow - guiding and pressure - increasing pipe 10, horizontal channel 101, inclined channel 102, axial length A of the long blade 81, axial length B of the short blade 82, radial height a of the long blade 81, radial height b of the short blade 82. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] The present utility model will be further described in detail below in conjunction with the accompanying drawings.

[0024] As Figures 1-3 shown, a hub structure of an axial-flow fan, the hub 2 is connected to the motor 1, the blades 4 are installed on the hub 2, and the outer edge of the blade 4 is fixed to the inner side of the impeller ring 3; characterized in that: there is a hub gap 5 between the hub 2 and the motor 1; the outer surface contour line of the hub 2 is in the shape of a sine function curve; the air outlet side of the hub 2 has a cooling and pressure stabilizing groove 6, and the cooling and pressure stabilizing groove 6 is arranged inside the hub 2; the hub 2 is connected to the rotating shaft of the motor 1 through a support ring 7; cooling ventilation holes 71 are provided on the support ring 7; the inner side surface of the hub 2 is a toroidal surface, and two rows of blades are arranged at intervals on the toroidal surface. The blades on the inlet side are long blades 81, and the blades on the outlet side are short blades 82. The long blades 81 and the short blades 82 are evenly arranged on the toroidal surface; an air-facing groove 9 is provided on the outer peripheral surface of the hub 2, and the air-facing groove 9 includes a groove circumferential surface 91 and a groove radial surface 92; a flow guiding and pressure increasing pipe 10 is arranged inside the hub 2, and the flow guiding and pressure increasing pipe 10 includes a horizontal channel 101 and an inclined channel 102. The inlet of the horizontal channel 101 is located on the groove radial surface 92, and the outlet of the inclined channel 102 is located between the long blades 81 and the short blades 82; the long blades 81 and the short blades 82 are arranged in a staggered manner in the axial direction. The long blades 81 are three-dimensional twisted blades, and the short blades 82 are straight blades; the included angle formed at the connection of the horizontal channel 101 and the inclined channel 102 is an obtuse angle; the cooling ventilation holes 71 are arranged in a circumferential array on the support ring 7.

[0025] Further, the included angle formed at the connection of the horizontal channel 101 and the inclined channel 102 is 116° - 166°.

[0026] Further, the cross-section of the air-facing groove 9 is a triangular structure.

[0027] Further, the number ratio of the long blades 81 to the short blades 82 is 1:2.

[0028] Further, the axial length of the long blade 81 is A, and the axial length of the short blade 82 is B, where A:B = 1.2 - 1.6.

[0029] Furthermore, the radial height of the long blade 81 is a, and the radial height of the short blade 82 is b, where a:b = 1.1 - 1.3.

[0030] Furthermore, the number of the short blades 82 is equal to the number of the cooling ventilation holes 71.

[0031] Furthermore, the short blades 82 and the cooling ventilation holes 71 are axially in one-to-one correspondence.

[0032] Furthermore, the number of the long blades 81 is equal to the number of the blades 4.

[0033] Furthermore, the long blades 81 and the blades 4 are radially in one-to-one correspondence.

[0034] For the hub structure of an axial-flow fan of the present utility model, there is a hub gap 5 between the hub 2 and the motor 1; the outer surface contour line of the hub 2 is in the shape of a sine function curve; the air outlet side of the hub 2 has a cooling and pressure stabilizing groove 6, and the cooling and pressure stabilizing groove 6 is arranged inside the hub 2; the hub 2 is connected to the rotating shaft of the motor 1 through a support ring 7; the support ring 7 is provided with cooling ventilation holes 71; the inner side surface of the hub 2 is a toroidal surface, and two rows of blades are arranged at intervals on the toroidal surface. The blades on the inlet side are long blades 81, and the blades on the outlet side are short blades 82. The long blades 81 and the short blades 82 are evenly arranged on the toroidal surface; an air-facing groove 9 is arranged on the outer peripheral surface of the hub 2, and the air-facing groove 9 includes a groove circumferential surface 91 and a groove radial surface 92; a flow guiding and pressure increasing pipe 10 is arranged inside the hub 2, and the flow guiding and pressure increasing pipe 10 includes a horizontal channel 101 and an inclined channel 102. The inlet of the horizontal channel 101 is located on the groove radial surface 92, and the outlet of the inclined channel 102 is located between the long blades 81 and the short blades 82; the long blades 81 and the short blades 82 are arranged in a staggered manner axially. The long blades 81 are three-dimensional twisted blades, and the short blades 82 are straight blades; the included angle formed at the connection of the horizontal channel 101 and the inclined channel 102 is an obtuse angle; the cooling ventilation holes 71 are arranged in a circumferential array on the support ring 7. Due to the improvement of the axial-flow fan structure, the heat dissipation characteristics are improved, the noise is reduced, and the conveying efficiency is increased.

Claims

1. A hub structure of a diagonal flow fan, wherein the hub (2) is connected to a motor (1), blades (4) are mounted on the hub (2), and the outer edges of the blades (4) are fixed to the inner side of an impeller ring (3); characterized in that: There is a hub gap (5) between the hub (2) and the motor (1); the outer surface contour line of the hub (2) is in the shape of a sine function curve; the air outlet side of the hub (2) is provided with a cooling and pressure stabilizing groove (6), which is arranged on the inner side of the hub (2); the hub (2) is connected to the rotating shaft of the motor (1) through a support ring (7); the support ring (7) is provided with a cooling ventilation hole (71); the inner side surface of the hub (2) is a circular ring surface, and two rows of blades are arranged on the circular ring surface at intervals, the blades on the inlet side are long blades (81), and the blades on the outlet side are short blades (82), and the long blades (81) and the short blades (82) are evenly arranged on the circular ring surface; a windward surface groove (9) is provided on the outer peripheral surface of the hub (2), and the windward surface groove (9) comprises a groove circumferential surface (91) and a groove radial surface (92); a drainage and boosting pipe (10) is arranged inside the hub (2), and the drainage and boosting pipe (10) comprises a horizontal channel (101) and an inclined channel (102), the inlet of the horizontal channel (101) is located on the groove radial surface (92), and the outlet of the inclined channel (102) is located between the long blade (81) and the short blade (82); the long blade (81) and the short blade (82) are staggered in the axial direction, the long blade (81) is a three-dimensional twisted blade, and the short blade (82) is a straight blade; the angle formed at the connection between the horizontal channel (101) and the inclined channel (102) is an obtuse angle; the cooling ventilation holes (71) are arranged in a circular array on the support ring (7).

2. The hub structure of a diagonal flow fan according to claim 1, characterized in that: The angle formed at the connection between the horizontal channel (101) and the inclined channel (102) is 116°-166°.

3. The hub structure of a diagonal flow fan according to claim 1, characterized in that: The cross section of the windward surface groove (9) is a triangular structure.

4. The hub structure of a diagonal flow fan according to claim 1, characterized in that: The ratio of the number of long blades (81) to the number of short blades (82) is 1:

2.

5. The hub structure of a diagonal flow fan according to claim 1, characterized in that: The axial length of the long blade (81) is A, and the axial length of the short blade (82) is B, wherein A:B=1.2-1.

6.

6. The hub structure of a diagonal flow fan according to claim 1, characterized in that: The radial height of the long blade (81) is a, and the radial height of the short blade (82) is b, wherein a:b=1.1-1.

3.

7. The hub structure of a diagonal flow fan according to claim 1, characterized in that: The number of the short blades (82) is equal to the number of the cooling ventilation holes (71).

8. The hub structure of a diagonal flow fan according to claim 7, characterized in that: The short blades (82) correspond to the cooling ventilation holes (71) in one-to-one axial position.

9. The hub structure of a diagonal flow fan according to claim 1, characterized in that: The number of long blades (81) is equal to the number of blades (4).

10. The hub structure of a diagonal flow fan according to claim 9, characterized in that: The long blades (81) correspond to the blades (4) in radial position.

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