Axial flow fan blade, fan, air conditioner outdoor unit and air conditioner

Abstract

The invention relates to an axial-flow fan blade, a fan, an air conditioner outdoor unit and an air conditioner, the axial-flow fan blade comprises a hub and a plurality of blades distributed in the circumferential direction of the hub, each blade comprises a blade root part, each blade root part is connected with the hub and provided with a front edge part and a rear edge part, and compared with the rear edge part, each front edge part is provided with a plurality of blades; by means of the axial flow fan blade, the aerodynamic efficiency of the blade can be improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of axial flow fan blades, and in particular, to an axial flow fan blade, a fan, an air conditioner outdoor unit and an air conditioner. Background Art

[0002] In the related art, the airflow inlet angle of the axial flow fan blade is too large, which causes the airflow on the suction surface of the blade to separate prematurely in the low radius area, generating a larger separation vortex structure, which reduces the aerodynamic efficiency of the blade. Summary of the invention

[0003] The purpose of the present disclosure is to provide an axial flow fan blade, a fan, an air conditioner outdoor unit and an air conditioner, wherein the axial flow fan blade can improve the aerodynamic efficiency of the blade.

[0004] In order to achieve the above-mentioned purpose, the present disclosure provides an axial flow fan blade, which includes a hub and a plurality of blades distributed circumferentially along the hub, the blade including a blade root portion, the blade root portion is connected to the hub and has a leading edge portion and a trailing edge portion, and the leading edge portion is twisted toward one side toward the air outlet direction compared to the trailing edge portion.

[0005] Optionally, the leading edge portion has a leading edge point, the leading edge portion has an airflow inlet angle at the leading edge point, and the airflow inlet angle is 0°~18°.

[0006] Optionally, the airflow inlet angle is less than or equal to 15°.

[0007] Optionally, the maximum radius of the blade root is R1, the maximum radius of the blade is R2, and the ratio of R1 to R2 is 0.3-0.5.

[0008] Optionally, the ratio of R1 to R2 is 0.39-0.46.

[0009] Optionally, the thickness of the leading edge portion is greater than the thickness of the trailing edge portion.

[0010] Optionally, the leading edge portion has a leading edge point, and the leading edge portion has a maximum thickness at the leading edge point.

[0011] Optionally, the hub has a width in the axial direction, and the ratio of the thickness at the leading edge point to the width of the hub is 0.1-0.2.

[0012] Optionally, the ratio of the thickness at the leading edge point to the width of the hub is 0.12-0.16.

[0013] Optionally, the trailing edge portion has a trailing edge point, and the thickness of the blade root portion gradually increases in a direction from the trailing edge point to the leading edge point.

[0014] According to a second aspect of the present disclosure, a fan is provided, comprising the axial flow fan blade as described above.

[0015] According to a third aspect of the present disclosure, there is provided an air conditioner outdoor unit, comprising the axial flow fan blade as described above.

[0016] According to a fourth aspect of the present disclosure, there is provided an air conditioner comprising the axial flow fan blade as described above.

[0017] Through the above technical solution, by twisting the leading edge of the blade toward the wind outlet direction, the contact angle between the airflow and the blade can be reduced, and the airflow inlet angle can be reduced, so that the airflow can enter the blade closer to the surface of the leading edge. As a result, the airflow is less obstructed at the leading edge of the blade, so that it can adhere to the suction surface of the blade more smoothly, delaying the time for the airflow to separate from the suction surface when passing through the suction surface, thereby improving the aerodynamic efficiency of the blade, allowing the airflow to drive the blade to rotate more effectively. In addition, the turbulent kinetic energy of the area where the airflow and the blade are separated is reduced, thereby reducing the noise generated by the rotation of the blade.

[0018] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a schematic diagram comparing an axial flow fan blade provided according to an embodiment of the present disclosure with a blade of a related art; Figure 2 is a schematic diagram of a blade modification of an axial flow fan blade provided according to an embodiment of the present disclosure; Figure 3 is a schematic diagram of the blade root structure of an axial flow fan blade provided according to an embodiment of the present disclosure; Figure 4 is a top view of an axial flow fan blade provided according to an embodiment of the present disclosure; Figure 5 is a front view of an axial flow fan blade provided according to an embodiment of the present disclosure; Figure 6 It is a schematic diagram of the overall structure of an axial flow fan blade provided according to an embodiment of the present disclosure.

[0020] Description of Reference Numerals 211'-front edge, 1-hub, 2-blade, 21-blade root, 211-leading edge, 2111-leading edge point, 212-trailing edge, 2121-trailing edge point, β-airflow inlet angle, L1-wind inlet direction. DETAILED DESCRIPTION

[0021] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0022] In the present disclosure, unless otherwise specified, the directional terms "inside" and "outside" used refer to the "inside" and "outside" relative to the contour of the corresponding component itself. In addition, in the following description, when referring to the drawings, the same symbols in different drawings represent the same elements. It should be understood by those skilled in the art that the above definitions are only used to explain and illustrate the present disclosure and should not be construed as limiting the present disclosure.

[0023] refer to Figure 1 As shown in the figure, the axial flow blade in the related art includes a leading edge portion 211', and the curvature of the leading edge portion 211' is consistent with that of the trailing edge portion, which results in a larger airflow inlet angle corresponding to the leading edge portion 211'. The airflow will separate from the blade prematurely when flowing through the suction surface, and it is easy to produce a larger separation vortex structure, thereby reducing the aerodynamic efficiency of the blade. In addition, the turbulent kinetic energy in the airflow separation area surges, which will also increase the noise generated during the rotation of the blade.

[0024] According to the specific implementation of the present disclosure, Figures 1 to 6 As shown, an axial flow fan blade is provided, which includes a hub 1 and a plurality of blades 2 distributed circumferentially along the hub 1, the blade 2 includes a blade root portion 21, the blade root portion 21 is connected to the hub 1, and has a leading edge portion 211 and a trailing edge portion 212, and the leading edge portion 211 is twisted toward one side toward the air outlet direction compared to the trailing edge portion 212, that is, the curvature of the leading edge portion 211 and the trailing edge portion 212 are distinguished, thereby reducing the airflow inlet angle.

[0025] Through the above technical solution, by twisting the leading edge 211 of the blade 2 toward the wind outlet direction, the contact angle between the airflow and the blade 2 can be reduced, and the airflow inlet angle β can be reduced, so that the airflow can flow into the blade 2 closer to the surface of the leading edge 211, thereby reducing the obstruction of the airflow at the leading edge of the blade 2, so that it can be more smoothly attached to the suction surface of the blade 2, delaying the time for the airflow to separate from the suction surface when flowing through the suction surface, thereby improving the aerodynamic efficiency of the blade 2, so that the airflow can more effectively drive the blade 2 to rotate. In addition, the turbulent kinetic energy of the separation area of ​​the airflow and the blade 2 is also reduced, thereby reducing the noise generated by the rotation of the blade 2.

[0026] When the blade 2 moves in the airflow, the first part that contacts the air or fluid is the leading edge 211. The airflow flows into the blade 2 from the leading edge 211 of the blade, flows along the blade to the trailing edge 212, and leaves the blade 2 through the trailing edge 212. In addition, when the blade 2 moves in the airflow, the side that collides with the airflow is called the pressure side because of the high pressure, and the other side is called the suction side.

[0027] In some embodiments of the present disclosure, reference Figure 2 As shown, the leading edge portion 211 has a leading edge point 2111, and the leading edge portion 211 has an airflow inlet angle β at the leading edge point 2111, and the airflow inlet angle β is 0°~18°. In this way, by controlling the torsion angle of the leading edge portion 211 of the blade 2 having the leading edge point 2111, the angle of the airflow inlet angle β is limited to between 0°~18°, so as to avoid the airflow on the suction surface of the blade 2 being separated prematurely at the blade root 21 when the airflow inlet angle β is greater than 18°, and it is helpful to reduce the impact of the airflow on the leading edge portion 211 and reduce energy loss. As a result, the airflow can smoothly enter the blade 2 along the leading edge portion 211 of the blade 2 to delay the airflow separation time, improve the aerodynamic efficiency, reduce the turbulent kinetic energy, and reduce the noise during the rotation of the blade 2.

[0028] In some embodiments of the present disclosure, reference Figure 1 As shown, the airflow inlet angle β is less than or equal to 15°. In this way, the smoothness of the airflow when entering the blade 2 along the leading edge 211 can be further ensured, the aerodynamic efficiency can be improved, the turbulent kinetic energy can be reduced, and the noise during the rotation of the blade 2 can be reduced.

[0029] In some embodiments of the present disclosure, reference Figure 4 As shown, the maximum radius of the blade root 21 is R1, the maximum radius of the blade 2 is R2, and the ratio of R1 to R2 is 0.3~0.5. In this way, the torsion range of the leading edge 211 can be controlled within the range of R1, avoiding the phenomenon that the torsion range of the blade root 21 is too small to effectively improve the premature separation of the airflow on the suction surface, and avoiding the situation that the aerodynamic performance of the blade 2 area far away from the blade root 21 is affected due to the torsion range of the blade root 21 being too large, thereby affecting the aerodynamic efficiency of the axial flow fan blade. In this way, it is ensured that the torsion of the leading edge 211 with the leading edge point 2111 can effectively improve the airflow separation phenomenon, improve the aerodynamic efficiency and reduce the turbulent kinetic energy.

[0030] In other embodiments, according to the scope of the separation phenomenon between the airflow and the suction surface, the leading edge portion 211 of the blade 2 between R1 and R2 can be twisted, wherein the twisting angle gradually decreases along the extension direction of the root portion 21 of the blade 2 away from the end of the hub 1, and the present disclosure does not impose specific restrictions on this.

[0031] In some embodiments of the present disclosure, reference Figure 4 As shown, the ratio of R1 to R2 is 0.39-0.46. In this way, by further limiting the torsion range of the blade root 21, it is possible to avoid a situation where the torsion range is too large, which affects the aerodynamic performance of the blade 2 region away from the blade root 21 and affects the aerodynamic efficiency of the axial flow fan blade, or a situation where the torsion range is too small, which causes the premature separation of the airflow on the suction surface and cannot be effectively improved. In this way, the reliability of the operation of the axial flow fan blade is further guaranteed.

[0032] In some embodiments of the present disclosure, reference Figure 2 and Figure 3 , Figure 5 and Figure 6 As shown, the thickness of the leading edge portion 211 is greater than the thickness of the trailing edge portion 212. In this way, since the airflow flows from the leading edge portion 211 to the trailing edge portion 212, the thickness of the leading edge portion 211 is set to be greater than the thickness of the trailing edge portion 212, so as to increase the structural strength of the leading edge portion 211 and the connection strength between the blade root portion 21 and the hub 1, thereby improving the structural reliability and service life of the blade 2.

[0033] In some embodiments of the present disclosure, reference Figure 2 and Figure 3 , Figure 5 and Figure 6 As shown, the leading edge portion 211 has a leading edge point 2111, and the leading edge portion 211 has a maximum thickness at the leading edge point 2111. In this way, the leading edge portion 211 that first contacts the airflow can withstand greater impact force and pressure, thereby reducing the risk of deformation or damage of the blade 2 and extending the service life of the blade 2.

[0034] In some embodiments of the present disclosure, reference Figure 2 As shown, the hub 1 has a width in the axial direction, and the ratio of the thickness H at the leading edge point 2111 to the width L of the hub 1 is 0.1-0.2. In this way, the thickness H of the blade 2 at the leading edge point 2111 is limited by the width L of the hub 1 in the axial direction, so that the thickness H of the blade 2 at the leading edge point 2111 can be prevented from being too thick, which will cause too much resistance to the airflow, and the weight of the blade 2 can be prevented from being too large, which will affect the rotation efficiency of the blade 2. At the same time, the thickness H of the blade 2 at the leading edge point 2111 can be prevented from being too small, which will lead to insufficient strength at the root of the blade 2, and the blade 2 is prone to breakage during rotation, which will affect the service life of the blade 2.

[0035] In some embodiments of the present disclosure, reference Figure 2As shown, the ratio of the thickness H at the leading edge point 2111 to the width L of the hub 1 is 0.12-0.16. Thus, by further limiting the thickness H of the blade 2 at the leading edge point 2111, it is avoided that the thickness H of the leading edge of the blade 2 is too large, causing too much resistance to the airflow, or the thickness H of the leading edge of the blade 2 is too small, affecting the rotation efficiency or service life of the blade 2. Thus, the reliability of the blade structure is further ensured.

[0036] In some embodiments of the present disclosure, reference Figure 2 and Figure 3 As shown, the trailing edge portion has a trailing edge point 2121, and the thickness of the blade root portion 21 gradually increases in the direction from the trailing edge point 2121 to the leading edge point 2111. In this way, when the airflow flows from the leading edge point 2111 to the trailing edge point 2121, a transition surface can be provided for the airflow, ensuring smooth flow of the airflow between the leading edge point 2111 and the trailing edge point 2121, reducing airflow resistance, allowing the airflow to better adhere to the surface of the blade 2, and avoiding premature separation of the airflow when flowing through the suction surface.

[0037] According to a second aspect of the present disclosure, a fan is provided, comprising the axial flow fan blade as described above. The fan has all the beneficial effects of the axial flow fan blade as described above, which will not be described in detail in the present disclosure.

[0038] According to a second aspect of the present disclosure, an air conditioner outdoor unit is provided, comprising the axial flow fan blade as described above. The air conditioner outdoor unit has all the beneficial effects of the axial flow fan blade as described above, and the present disclosure will not elaborate on them here.

[0039] According to a third aspect of the present disclosure, an air conditioner is provided, comprising the axial flow fan blade as described above. The air conditioner has all the beneficial effects of the axial flow fan blade as described above, which will not be described in detail in the present disclosure.

[0040] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0042] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An axial flow fan blade, characterized in that: The axial flow fan blade includes a hub and a plurality of blades distributed circumferentially along the hub, the blade includes a blade root portion, the blade root portion is connected to the hub and has a leading edge portion and a trailing edge portion, and the leading edge portion is twisted toward one side of the air outlet direction compared to the trailing edge portion.

2. The axial flow fan blade according to claim 1, characterized in that: The leading edge portion has a leading edge point, and the leading edge portion has an airflow inlet angle at the leading edge point, and the airflow inlet angle is 0°~18°.

3. The axial flow fan blade according to claim 2, characterized in that: The airflow inlet angle is less than or equal to 15°.

4. The axial flow fan blade according to claim 1, characterized in that: The maximum radius of the blade root is R1, the maximum radius of the blade is R2, and the ratio of R1 to R2 is 0.3-0.

5.

5. The axial flow fan blade according to claim 4, characterized in that: The ratio of R1 to R2 is 0.39-0.

46.

6. The axial flow fan blade according to any one of claims 1 to 5, characterized in that: The thickness of the leading edge portion is greater than the thickness of the trailing edge portion.

7. The axial flow fan blade according to claim 6, characterized in that: The leading edge portion has a leading edge point, and the leading edge portion has a maximum thickness at the leading edge point.

8. The axial flow fan blade according to claim 7, characterized in that: The hub has a width in the axial direction, and the ratio of the thickness at the leading edge point to the width of the hub is 0.1-0.

2.

9. The axial flow fan blade according to claim 8, characterized in that: The ratio of the thickness at the leading edge point to the width of the hub is 0.12-0.

16.

10. The axial flow fan blade according to claim 6, characterized in that: The trailing edge portion has a trailing edge point, and the thickness of the blade root portion gradually increases in a direction from the trailing edge point to the leading edge point.

11. A fan, characterized in that: It comprises the axial flow fan blade as claimed in any one of claims 1 to 10.

12. An air conditioner outdoor unit, characterized in that: It comprises the axial flow fan blade as claimed in any one of claims 1 to 10.

13. An air conditioner, characterized in that: It comprises the axial flow fan blade as claimed in any one of claims 1 to 10.

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