Axial flow fan and air conditioner

Abstract

The utility model discloses an axial flow fan and an air conditioner, and belongs to the technical field of air conditioners. The axial flow fan comprises a hub and blades, the blades are connected to the peripheral wall of the hub, each blade is provided with a front edge, a rear edge, an inner edge and an outer edge, a plurality of reinforcing ribs are arranged on the suction surface of each blade, the reinforcing ribs are close to the front edges of the blades and close to the outer edges of the blades, and the reinforcing ribs are arranged on the outer edges of the blades. And the plurality of reinforcing ribs are projected on a plane vertical to the axis of the axial flow fan and are arranged along the radial direction of the axial flow fan. The air conditioner comprises the axial fan. According to the axial flow fan, the forming stability of the axial flow fan can be improved, cost is reduced, and noise is reduced.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to an axial fan and an air conditioner. Background Technology

[0002] An air conditioner is a device used to regulate the temperature, humidity, air cleanliness, or airflow of indoor air. An air conditioner typically consists of two parts: an outdoor unit and an indoor unit.

[0003] Axial fans are used in outdoor air conditioning units to dissipate the cooling and heating energy generated by the outdoor heat exchanger. With the development of lightweight design, the blades and hub thickness of axial fans are constantly being reduced.

[0004] Currently, axial flow fans experience issues such as mold flow during production and product cooling and shrinkage during injection molding. Utility Model Content

[0005] This application provides an axial flow fan and air conditioner that can improve airflow during production, reduce costs, and reduce noise.

[0006] In one aspect of this application, an axial flow fan includes: a hub and blades, the blades being connected to the outer peripheral wall of the hub, and the blades having a leading edge, a trailing edge, an inner edge, and an outer edge.

[0007] The suction surface of the blade is provided with multiple reinforcing ribs, which are located near the leading edge and outer edge of the blade and projected onto a plane perpendicular to the axis of the axial fan. The multiple reinforcing ribs are arranged radially along the axial fan.

[0008] In this technical solution, since the leading outer edge of the blades mostly forms a sharp angle, this area is prone to mold flow during production, cooling deformation during injection molding, and fracture deformation during product molding and use. Therefore, by setting reinforcing ribs on the suction surface of the blades, with the reinforcing ribs close to the leading outer edge, the mold flow during production and cooling deformation during injection molding can be improved, thus enhancing molding stability. It can also improve the deformation and maximum stress conditions during axial fan operation, significantly improving the operating strength of the axial fan.

[0009] In some embodiments, the reinforcing ribs are arc-shaped, with the center of the reinforcing ribs coinciding with the center of the hub. The radius of the reinforcing rib closest to the outer edge is R1, where 0.95R≤R1<R, and R is the outer diameter of the axial fan.

[0010] In this technical solution, by limiting the position of the reinforcing ribs, the reinforcing ribs can be applied to the parts of the blade that require enhanced structural strength and improved forming stability.

[0011] In some embodiments, the reinforcing rib is arc-shaped, the center of the reinforcing rib coincides with the center of the wheel hub, and the central angle γ corresponding to the reinforcing rib satisfies: 10°≤γ≤20°.

[0012] In this technical solution, γ is within this range, which can meet the requirements for improving structural strength and forming stability at the leading outer edge angle of the blade, while avoiding the waste of material costs caused by excessively long reinforcing ribs.

[0013] In some embodiments, the central angle γ corresponding to the reinforcing rib increases as the radius corresponding to the reinforcing rib increases.

[0014] In this technical solution, among the multiple reinforcing ribs, the longer the ribs are closer to the outer edge. Since the edge of the blade is more prone to mold flow and structural deformation than its interior, making the reinforcing ribs closer to the outer edge longer can improve the strength and stiffness at the leading outer edge corner of the blade and reduce torsion.

[0015] In some embodiments, the suction surface of the blade is provided with a plurality of first grooves, which are disposed near the outer edge of the blade and projected on a plane perpendicular to the axis of the axial fan. The plurality of first grooves are arranged at circumferential intervals with the center of the hub as the center.

[0016] In this technical solution, the weight of the blades can be reduced by setting the first groove, and the mold flow, cooling deformation during injection molding, and deformation during operation can be improved. While reducing the cost of axial flow fans, the fan molding stability is significantly improved.

[0017] In some embodiments, the first groove is arc-shaped, the center of the first groove coincides with the center of the hub, and the edge of the first groove includes an outer arc edge near the outer edge, the radius of the outer arc edge being R5, 0.95R≤R5≤0.98R, where R is the outer diameter of the axial fan.

[0018] In this technical solution, if 0.95R > R5, then R5 is relatively small, the first groove is far from the outer edge, and it cannot effectively improve the mold flow and cooling shrinkage phenomenon in the area near the outer edge of the blade.

[0019] If R5 > 0.98R, then R5 is relatively large, the first groove is relatively close to the outer edge, the part between the first groove and the outer edge is relatively thin, it is not easy to form, and it is easy to break and deform.

[0020] In some embodiments, the first groove is arc-shaped, and the center of the first groove coincides with the center of the wheel hub; the central angle β corresponding to the first groove satisfies: 15°≤β≤30°;

[0021] Draw lines from the two ends of the first groove along its length to the center of the hub. The central angle α between two adjacent first grooves satisfies: 10°≤α≤20°.

[0022] In this technical solution, α and β, within this numerical range, can significantly improve the stability of mold forming without affecting the structural strength of the blade.

[0023] In some embodiments, the center of the suction surface is further provided with a plurality of polygonal second grooves projected onto a plane perpendicular to the axis of the axial fan, wherein the plurality of sides of the second grooves are arc-shaped.

[0024] In this technical solution, the weight of the blades can be reduced by setting a second groove, and phenomena such as mold flow, cooling deformation during injection molding, and deformation during operation can be improved. While reducing the cost of axial flow fans, the fan molding stability is significantly improved.

[0025] In some embodiments, the second groove includes a first sub-groove and a second sub-groove.

[0026] The edge of the first sub-groove has a first side and a second side whose centers coincide with the center of the hub. The first side is close to the hub, and the second side is close to the outer edge.

[0027] The second sub-groove is located between the leading edge and the first sub-groove. The edge of the second sub-groove has a fifth side and a sixth side whose centers coincide with the center of the hub. The fifth side and the second side are located on the same circle, and the sixth side is located in the middle of the radial direction of the blade.

[0028] In another aspect of this application, an air conditioner includes: a motor, and an axial fan as described above, wherein the output shaft of the motor is connected to the hub of the axial fan.

[0029] In this technical solution, because the operating strength and forming stability of the axial fan are improved, the service life and operating noise of the air conditioner using the axial fan are improved. Attached Figure Description

[0030] Figure 1 A perspective view of an outdoor unit of an air conditioner according to some embodiments is shown;

[0031] Figure 2 A perspective view of an outdoor unit of an air conditioner according to some embodiments is shown from another angle;

[0032] Figure 3 A partial schematic diagram of an outdoor unit of an air conditioner according to some embodiments is shown;

[0033] Figure 4 A perspective view of an axial fan according to some embodiments is shown;

[0034] Figure 5 A perspective view of an axial fan according to some embodiments is shown;

[0035] Figure 6 A front view of an axial fan according to some embodiments is shown;

[0036] Figure 7 A partial schematic diagram of an axial fan according to some embodiments is shown. Figure 1 ;

[0037] Figure 8 A partial schematic diagram of blades in an axial fan according to some embodiments is shown;

[0038] Figure 9 A partial schematic diagram of an axial fan according to some embodiments is shown. Figure 2 ;

[0039] Figure 10 It shows Figure 9 Enlarged view in the X direction;

[0040] Figure 11 A partial schematic diagram of an axial fan according to some embodiments is shown. Figure 3 ;

[0041] In the above figures, 210 is the shell; 211 is the front wall; 212 is the rear wall; 213 is the top wall; 214 is the bottom wall; 215 is the left wall; 216 is the right wall; 217 is the grating plate; 220 is the heat exchanger; and 230 is the motor bracket.

[0042] 100. Axial fan; 10. Hub; 20. Blade; 21. Leading edge; 22. Trailing edge; 23. Outer edge; 24. Inner edge; 25. Pressure surface; 26. Suction surface; 30. Reinforcing rib; 40. First groove; 41. Outer arc edge; 42. Inner arc edge; 50. Second groove; 51. First sub-groove; 511. First side; 512. Second side; 513. Third side; 514. Fourth side; 52. Second sub-groove; 521. Fifth side; 522. Sixth side; 523. Seventh side; 524. Eighth side. Detailed Implementation

[0043] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0044] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0045] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] In this application, the air conditioner performs a refrigeration cycle by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0048] The compressor compresses refrigerant gas at a low temperature and low pressure and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0049] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0050] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0051] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0052] Fans are used in both the indoor and outdoor units. The fans are used to heat the air by passing it through the condenser and to cool the air by passing it through the evaporator.

[0053] The embodiments of this application involve the optimization of axial fans, and air conditioners that use the axial fans of this application are also within the protection scope of this application.

[0054] When the outdoor unit and the indoor unit are two separate structures, the outdoor unit is also called the outdoor air conditioner unit, and the indoor unit is also called the indoor air conditioner unit.

[0055] The following example uses an air conditioner outdoor unit that includes an axial fan:

[0056] Reference Figures 1 to 3 The outdoor unit of the air conditioner includes the casing 210.

[0057] The housing 210 forms the general appearance of the outdoor unit of the air conditioner and is roughly rectangular box-shaped. The housing 210 has a front wall 211 forming the front structure, a rear wall 212 forming the rear structure, a top wall 213 forming the top structure, a bottom wall 214 forming the bottom structure, and a left wall 215 and a right wall 216 forming the left and right side structures.

[0058] An open main air inlet is formed on the rear wall 212, an open side air inlet is formed on the left wall 215, and an open air outlet is formed on the front wall 211. A grille plate 217 is installed at the air outlet, and small holes on the grille plate 217 form the air outlet. External air enters the housing 210 through the side air inlet and the main air inlet, and flows out through the air outlet.

[0059] The outdoor unit of the air conditioner includes a heat exchanger 220. The heat exchanger 220 is located inside the housing 210 with a corresponding air inlet. The heat exchanger 220 includes heat transfer tubes and multiple fins arranged side by side on the heat transfer tubes. Viewed vertically, the heat transfer tubes are generally L-shaped and extend to the left wall 215 and the rear wall 212. Viewed horizontally, the heat transfer tubes have multiple fins in the vertical direction.

[0060] The heat transfer pipes in the outdoor unit's heat exchanger 220 are connected to the compressor, the indoor unit's heat exchanger, the expansion valve, etc., via piping, thus forming the refrigerant circuit of the air conditioner.

[0061] The outdoor unit of the air conditioner includes an axial fan 100. The axial fan 100 is disposed within the housing 210 and is used to drive the flow of outdoor air.

[0062] A drive source, such as an electric motor, is connected to the front of the heat exchanger 220 via a motor bracket 230. An axial fan 100 is connected to the rotating shaft of the motor and is driven to rotate by the motor. The axial fan 100 is located in front of the motor, which provides rotational driving force to it.

[0063] The outdoor unit of the air conditioner draws in air from the side and rear of the casing 210 as the axial fan 100 rotates. The drawn-in air passes through the heat exchanger 220 and exchanges heat with the refrigerant flowing inside the heat exchanger 220. Then it is blown out from the air outlet on the front side of the casing 210.

[0064] Reference Figure 4 , Figure 5 An axial fan 100 according to an embodiment of this application includes a hub 10 and a plurality of blades 20. The hub 10 is used to connect to a motor and is driven to rotate; the blades 20 are attached to the outer peripheral surface of the hub 10.

[0065] Specific reference Figure 4 The hub 10 rotates around the rotating shaft A, creating airflow. The side closer to the air inlet (rear side) is the upstream side, and the side closer to the air outlet (front side) is the downstream side. The airflow moves from the rear side to the front side at the axial fan 100.

[0066] The blade 20 includes a leading edge 21 and a trailing edge 22. The leading edge 21 and trailing edge 22 are two edges on the blade 20 extending outward from the hub 10; with reference to the rotation direction B of the axial fan 100, the leading edge 21 is located on the forward side relative to the trailing edge 22. For example, in… Figure 4 In the image, viewed from the front to the rear, the axial fan rotates counterclockwise (B) relative to the rotation axis A. Taking a blade 20 as the object of study, the leading edge 21 is formed on the forward side of the rotation direction B, meaning that the leading edge 21 is in front of the trailing edge 22 in the rotation direction B. The trailing edge 22 is formed on the rearward side of the rotation direction B, meaning that the trailing edge 22 is behind the leading edge 21 in the rotation direction B.

[0067] The blade 20 includes an outer edge 23 and an inner edge 24.

[0068] The outer edge 23 is the outermost edge of the blade 20. The outer edge 23 connects the outermost end of the leading edge 21 and the outermost end of the trailing edge 22. The outer edge 23 extends at an angle relative to the rotation axis A. The inner edge 24 is the edge connecting the blade 20 to the hub 10. The inner edge 24 connects the innermost end of the leading edge 21 and the innermost end of the trailing edge 22. The inner edge 24 extends at an angle relative to the rotation axis A.

[0069] As the axial fan 100 rotates, the blades 20 use their blade surfaces to push against the gas present between the blades 20 to transport fluid. In the blades 20, relative to the airflow direction, the upstream surface of the blade 20 becomes the suction surface 26, and the downstream surface becomes the pressure surface 25. Figure 4 In the middle, the front side of the blade 20 becomes the pressure surface 25, and the rear side of the blade 20 becomes the suction surface 26.

[0070] In some embodiments, refer to Figures 6 to 8 The suction surface 26 of the blade 20 is provided with reinforcing ribs 30. The reinforcing ribs 30 protrude from the suction surface 26.

[0071] The reinforcing rib 30 is located near the outer edge 23 and the leading edge 21 of the blade 20. That is, the reinforcing rib 30 is located at the corner formed by the outer edge 23 and the leading edge 21 on the suction surface 26.

[0072] Since the leading outer edge of the blades 20 mostly forms a sharp angle, this part is prone to mold flow during production, cooling deformation during injection molding, and breakage deformation during product molding and use. Therefore, this application improves mold flow during production and cooling deformation during injection molding by providing reinforcing ribs 30 on the suction surface 26 of the blades 20, with the reinforcing ribs 30 close to the leading outer edge. This improves molding stability and reduces deformation and maximum stress during operation of the axial fan 100, significantly improving the operating strength of the axial fan 100.

[0073] In some embodiments, the longitudinal direction of the reinforcing ribs 30 is approximately the same as the extending direction of the outer edge 23. A plurality of reinforcing ribs 30 are arranged at radial intervals along the axial flow fan 100.

[0074] To address the issue of fracture and deformation at the leading outer edge corner of the blade 30 during weight reduction and thinning, this application strengthens this location by providing multiple reinforcing ribs 30, thus preventing fracture and deformation. The spaced arrangement of the multiple reinforcing ribs 30 expands the area where they are located, thereby increasing the area of ​​increased blade strength. Furthermore, the spaced arrangement of the reinforcing ribs 30 avoids stress concentration at this location.

[0075] In some embodiments, the reinforcing rib 30 is arc-shaped. Projected onto a plane perpendicular to the axis of the axial fan 100, the center of the circle corresponding to the reinforcing rib 30 coincides with the center of the hub 10. This facilitates mold making and reduces production costs.

[0076] In other embodiments, the reinforcing rib 30 may also be in the form of a straight strip.

[0077] In some embodiments, see specific references Figure 8The reinforcing ribs 30 and the outer edge 23 are spaced apart by a distance Δd, which is relatively small.

[0078] Combined with reference Figure 7 Among the multiple reinforcing ribs 30, the radius of the reinforcing rib 30 closest to the outer edge 23 is R1, and the radius of the axial fan 100 is R.

[0079] 0.95R ≤ R1 ensures that the reinforcing rib 30 is relatively close to the outer edge 23. If 0.95R > R1, the reinforcing rib 30 is relatively far from the outer edge 23, and the effect of the reinforcing rib 30 in improving the forming stability at the leading outer edge corner of the blade 20 and preventing fracture and deformation in that area will be weakened.

[0080] R1 < R, which ensures that the edge of the reinforcing rib 30 will not be flush with the outer edge 23.

[0081] Because the distance Δd from the radial outer edge 23 to the reinforcing rib 30 is relatively small, the torque experienced by the blade portion corresponding to Δd is relatively small, thus this portion is less prone to deformation. Therefore, both the blade portion in the region corresponding to Δd and the blade portion in the region corresponding to the reinforcing rib 30 are less prone to deformation.

[0082] If multiple reinforcing ribs 30 are moved as a whole towards the outer edge 23, or even moved to the point where the outermost edge of the reinforcing rib 30 is flush with the outer edge 23, i.e. Δd=0, the reinforcing rib 30 can only strengthen the blade portion corresponding to the reinforcing rib 30, thus reducing the effective area of ​​the reinforcing rib 30.

[0083] For example, R1 can take values ​​from 0.95R, 0.96R, 0.97R, 0.98R, and 0.99R.

[0084] In some embodiments, among the plurality of reinforcing ribs 30, the radius corresponding to the reinforcing rib 30 that is furthest from the outer edge 23 (and also the reinforcing rib 30 that is closest to the inner edge 24) is R3, where 0.83R≤R3.

[0085] Normally, the thickness at the leading edge 21 gradually increases from the outer edge 23 to the inner edge 24. Therefore, the closer the part of the blade 20 is to the leading edge 21 and the closer it is to the inner edge 24, the greater the structural strength, and there is no need to further strengthen the structural strength.

[0086] With 0.83R≤R3, it can be ensured that the reinforcing rib 30 is located in the area of ​​the blade 20 where the structure needs to be reinforced.

[0087] In some embodiments, the spacing Δdi between two adjacent reinforcing ribs 30 is equal along the direction close to the hub 10.

[0088] For example, there are three reinforcing ribs 30: reinforcing rib 30_1, reinforcing rib 30_2, and reinforcing rib 30_3. The radius corresponding to reinforcing rib 30_1 is defined as R1, the radius corresponding to reinforcing rib 30_2 is R2, and the radius corresponding to reinforcing rib 30_3 is R3. R1 > R2 > R3.

[0089] The spacing between reinforcing ribs 30_1 and 30_2 is Δd1, and the spacing between reinforcing ribs 30_2 and 30_3 is Δd2. Δd1 = Δd2.

[0090] As a specific example, R1 = 0.97*R, R2 = 0.91*R, and R3 = 0.85*R.

[0091] Δd1=R1-R2=0.06R. Δd2=R2-R3=0.06R.

[0092] In other words, along the direction closest to the hub 10, the radii corresponding to the multiple reinforcing ribs 30 decrease sequentially in an arithmetic sequence. This ensures that the spacing Δdi between two adjacent reinforcing ribs 30 is equal.

[0093] It should be noted that the radius corresponding to the reinforcing rib 30 described in this application can be the radius of the circle containing the inner edge of the reinforcing rib 30, the radius of the circle containing the outer edge of the reinforcing rib 30, or the radius of the circle containing the center line between the inner and outer edges of the reinforcing rib 30.

[0094] In some embodiments, the spacing Δdi between two adjacent reinforcing ribs 30 gradually increases along the direction close to the hub 10.

[0095] As the need for enhanced structural strength and improved die flow during molding gradually decreases along the direction closer to the hub 10, the spacing Δdi between adjacent reinforcing ribs 30 can be gradually increased. This allows for the use of a smaller number of reinforcing ribs 30 to meet the requirements for enhanced structural strength and improved die flow at the leading outer edge corner of the blade 20.

[0096] In some embodiments, refer to Figure 8 The direction from the pressure surface 25 to the suction surface 26 (or the direction from the suction surface 26 to the pressure surface 25) is the thickness direction of the blade 20, and also the thickness direction of the reinforcing rib 30. The radial direction corresponding to the reinforcing rib 30 is the width direction of the reinforcing rib 30.

[0097] The width w of the reinforcing rib 30 is greater than the thickness t of the reinforcing rib 30. w > t, which allows the reinforcing rib 30 to cover a larger area on the suction surface 26.

[0098] In some embodiments, the thickness of the reinforcing rib 30 is t = (2~3) mm. 1.5t≤w≤2t.

[0099] In some embodiments, the central angle γ of the arc length of the reinforcing rib 30 is 10° to 20°. Within this range, the requirements for improved structural strength and forming stability at the leading outer edge angle of the blade 20 can be met, while avoiding material cost waste caused by the reinforcing rib 30 being too long.

[0100] If 10° > γ, then the reinforcing rib 30 is relatively short, and its effect on improving the structural strength and forming stability at the leading outer edge angle of the blade 20 is limited.

[0101] If γ > 20°, then the reinforcing rib 30 is relatively long and will extend to the area of ​​the blade 20 where structural strength and forming stability do not need to be improved.

[0102] In some embodiments, the central angle γ corresponding to the reinforcing rib 30 increases as the radius corresponding to the reinforcing rib 30 increases.

[0103] The radius R1 corresponding to stiffener 30_1 is greater than the radius R2 corresponding to stiffener 30_2, which is greater than the radius R3 corresponding to stiffener 30_3. The central angle γ1 of stiffener 30_1 is greater than the central angle γ2 of stiffener 30_2, which is greater than the central angle γ3 of stiffener 30_3.

[0104] Among the multiple reinforcing ribs 30, the closer to the outer edge 23, the longer the reinforcing rib 30. Since the edge of the blade 20 is more prone to mold flow and structural deformation than its interior, making the reinforcing ribs 30 closer to the outer edge 23 longer can improve the strength and rigidity at the leading outer edge corner of the blade 20 and reduce torsion.

[0105] In some embodiments, refer to Figure 7 and Figure 9 The suction surface 26 of the blade 20 is provided with a plurality of first grooves 40, which are formed by the suction surface 26 being recessed towards the pressure surface 25. The plurality of first grooves 40 are close to the outer edge 23 and are arranged at intervals along the extending direction of the outer edge 23.

[0106] In this application, by setting the first groove 40, the weight of the blade 20 can be reduced, and the mold flow, cooling deformation during injection molding, and deformation during operation can be improved. While reducing the cost of the axial fan 100, the fan molding stability is significantly improved.

[0107] In some embodiments, among the plurality of first grooves 40, the first groove 40 closest to the reinforcing rib 30 is arranged at intervals in the circumferential direction with the reinforcing rib 30.

[0108] In the circumferential direction, multiple first grooves 40 are arranged from the side near the trailing edge 22 to the reinforcing rib 30, so that the first grooves 40 can improve the forming stability of the part of the blade 20 near the entire outer edge 23.

[0109] In some embodiments, when projected onto a plane perpendicular to the axis of the axial fan 100, a plurality of first grooves 40 are arranged at circumferential intervals along a circle centered on the center of the hub 10, so that the distance from the first grooves 40 to the outer edge 23 is relatively uniform, which is beneficial for molding.

[0110] In some embodiments, refer to Figure 9 and Figure 10 The edge of the first groove 40 includes an outer arc edge 41 near the outer edge 23. The outer arc edge 41 forms the outer edge of the first groove 40.

[0111] The outer arc edge 41 is arc-shaped, and the center of the outer arc edge 41 coincides with the center of the wheel hub 10.

[0112] The edge of the first groove 40 includes an inner arc edge 42. The inner arc edge 42 is farther away from the outer edge 21 than the outer arc edge 41. The inner arc edge 42 forms the inner edge of the first groove 40.

[0113] The inner arc edge 42 is arc-shaped, and the center of the inner arc edge 42 coincides with the center of the outer arc edge 41.

[0114] The outer arc edge 41 and the inner arc edge 42 are connected by a circular arc at their ends on the same side, and the outer arc edge 41 and the inner arc edge 42 are tangent to the circular arc respectively.

[0115] The edge of the first groove 40 is connected end to end by an outer arc edge 41, an arc, an inner arc edge 42, and another arc.

[0116] In some embodiments, the width a of the first groove 40 is not less than the width w of the reinforcing rib 30.

[0117] If the width a of the first groove 40 is less than the width w of the reinforcing rib 30, the width of the first groove 40 is relatively narrow, which has almost no impact on the weight of the blade 20 and cannot improve the molding stability.

[0118] In some embodiments, the radius corresponding to the outer arc edge 41 is R5, where 0.95R≤R5≤0.98R.

[0119] If 0.95R > R5, then R5 is relatively small, and the outer arc edge 41 of the first groove 40 is relatively far from the outer edge 23, which cannot effectively improve the mold flow and cooling shrinkage phenomenon in the area near the outer edge of the blade 20.

[0120] If R5 > 0.98R, then R5 is relatively large, the outer arc edge 41 of the first groove 40 is relatively close to the outer edge 23, and the part between the outer arc edge of the second groove 40 and the outer edge 23 is relatively thin, making it difficult to form and prone to breakage and deformation.

[0121] In some embodiments, the width a of the first groove 40 is 2 to 4 mm. While avoiding the first groove 40 from affecting the strength of the blade 20, this improves mold flow, cooling deformation during injection, and deformation during operation, significantly enhancing molding stability.

[0122] In some embodiments, refer to Figure 9 The central angle β corresponding to the first groove 40 satisfies: 15°≤β≤30°.

[0123] If 15° > β, then the first groove 40 is relatively short and cannot effectively improve the forming stability of the blade 20.

[0124] If β > 30°, then the first groove 40 is relatively long, and the first groove 40 is elongated, making it prone to deformation and breakage.

[0125] In some embodiments, lines are drawn from both ends of the first groove 40 along its length toward the center of the hub 10. The central angle α corresponding to the interval between two adjacent first grooves 40 satisfies: 10°≤α≤20°.

[0126] If 10° > α, then the spacing between the first grooves 40 is relatively small, the first grooves 40 have a greater impact on the structural strength of the blade 20, and breakage is likely to occur at the first grooves 40.

[0127] If α > 30°, then the spacing between the first grooves 40 is relatively large, which will reduce the effect of improving molding stability through the first grooves 40.

[0128] In some embodiments, refer to Figure 6 and Figure 11 The suction surface 26 may have multiple polygonal second grooves 50 in the middle.

[0129] This application can reduce the weight of the blade 20 by setting the second groove 50, and can also improve the mold flow, cooling deformation during injection, deformation during operation, etc., thereby reducing the cost of the axial fan 100 and significantly improving the fan molding stability.

[0130] In some embodiments, when projected onto a plane perpendicular to the axis of the axial fan 100, multiple sides of the second groove 50 are arc-shaped. Arc shapes are easier to form.

[0131] In some embodiments, the second groove 50 includes a first sub-groove 51. The edge of the first sub-groove 51 includes a first side 511. The first side 511 is disposed near the inner edge 24.

[0132] The first side 511 is arc-shaped, and the center of this arc coincides with the center of the hub 10. The radius corresponding to the first side 511 is R6, where 0.35R≤R6≤0.4R. Within this range, R6 ensures that the first side 511 is relatively close to the inner edge 24 without being too close.

[0133] The edge of the first sub-groove 51 includes a second side 512. The second side 512 is further away from the inner edge 24 than the first side 511.

[0134] The second side 512 is arc-shaped, and the center of this arc coincides with the center of the hub 10. The radius of the second side 512 is R8, where 0.8R ≤ R8 ≤ 0.86R. Within this range, R8 ensures that the second side 512 is relatively close to the first groove 40 without being too close.

[0135] The edge of the first sub-groove 51 includes a third side 513 and a fourth side 514. The first side 511, the third side 513, the second side 512, and the fourth side 514 are connected end to end to form the first sub-groove 51. The third side 513 is closer to the rear edge 22 than the fourth side 514.

[0136] The third side 513 is an arc, protruding towards the fourth side 514. The radius of the third side 513 is 200-300 mm.

[0137] The fourth side 514 is an arc, protruding towards the third side 513. The radius of the fourth side 514 is 400-600 mm.

[0138] The radii of the third side 513 and the fourth side 514 are both relatively large, which ensures that the distance between the third side 513 and the third side 514 is not too small.

[0139] In some embodiments, the second groove 50 includes a second sub-groove 52. The second sub-groove 52 is located between the leading edge 21 and the first sub-groove 51.

[0140] The edge of the second sub-groove 52 includes the fifth side 521. The fifth side 521 and the second side 512 are located on the same circle, that is, the radius corresponding to the fifth side 521 is equal to R8.

[0141] The edge of the second sub-groove 52 includes a sixth side 522. The sixth side 522 is closer to the inner edge 24 than the fifth side 521.

[0142] The sixth side 522 is arc-shaped, and the center of this arc coincides with the center of the hub 10. The radius corresponding to the sixth side 522 is R7, where 0.4R≤R7≤0.5R.

[0143] The edge of the second sub-groove 52 includes a seventh side 523 and an eighth side 524. The fifth side 521, the seventh side 523, the sixth side 522, and the eighth side 524 are connected end to end to form the second sub-groove 52. The eighth side 524 is closer to the leading edge 21 than the seventh side 514.

[0144] The seventh side 523 is an arc, and it protrudes towards the first sub-groove 51. The radius of the seventh side 523 is 400-600 mm.

[0145] The eighth side 524 is an arc, and it protrudes towards the front edge 21. The radius of the eighth side 524 is 80-120 mm.

[0146] The sixth side 522 of the second sub-groove 52 is approximately located in the radial middle of the blade 20, while the radius of the eighth side 524 is relatively small, which allows the angle formed by the sixth side 522 and the eighth side 524 to have a certain distance from the leading edge 21.

[0147] The blade without reinforcing ribs 30, the first groove 40, and the second groove 50 is the original blade. The blade with reinforcing ribs 30, the first groove 40, and the second groove 50 is the optimized blade. The original axial flow fan uses the original blade, and the optimized axial flow fan 100 uses the optimized blade 20. The axial flow fan 100 of this application is the optimized axial flow fan.

[0148] This application compares the noise levels of the axial fan before and after optimization:

[0149] rotational speed (rpm) 400 500 600 700 800 900 Noise dB(A) before optimization 45.2 48.3 51.1 53.5 56.7 58.6 Optimized noise dB(A) 43.4 46.5 49.3 51.7 54.9 56.8

[0150] As can be seen from the table above, the optimized axial fan 100 produces less noise during operation compared to the unoptimized version. Therefore, the axial fan in this application can further reduce operating noise and improve listening experience.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0152] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. An axial flow fan characterised in that, Comprising: A hub; Blades, which are connected to the outer peripheral wall of the hub. The blades have a leading edge, a trailing edge, an inner edge and an outer edge. On the suction surface of the blades, there are provided: A plurality of reinforcing rib strips, which are arranged close to the leading edge and the outer edge of the blade. When projected onto a plane perpendicular to the axis of the axial flow fan, the plurality of reinforcing rib strips are arranged radially along the axial flow fan.

2. The axial fan according to claim 1, characterized in that The reinforcing rib strips are arc-shaped, and the centers of the reinforcing rib strips coincide with the center of the hub. The radius corresponding to the reinforcing rib strip closest to the outer edge is R1, where 0.95R ≤ R1 < R, and R is the radius of the axial flow fan.

3. The axial fan according to claim 1, characterized in that The reinforcing rib strips are arc-shaped, and the centers of the reinforcing rib strips coincide with the center of the hub. The central angle γ corresponding to the reinforcing rib strips satisfies: 10° ≤ γ ≤ 20°.

4. The axial fan according to claim 3, characterized in that The central angle γ corresponding to the reinforcing rib strips increases as the radius corresponding to the reinforcing rib strips increases.

5. The axial fan according to claim 1, wherein On the suction surface of the blade, there are provided: A plurality of first grooves, which are arranged close to the outer edge of the blade. When projected onto a plane perpendicular to the axis of the axial flow fan, the plurality of first grooves are arranged at intervals along a circumference centered on the center of the hub.

6. The axial fan according to claim 5, characterized in that The first grooves are arc-shaped, and the centers of the first grooves coincide with the center of the hub. The edge of the first groove includes an outer arc edge close to the outer edge, and the radius corresponding to the outer arc edge is R5, where 0.95R ≤ R5 ≤ 0.98R, and R is the radius of the axial flow fan.

7. The axial fan according to claim 5, wherein The first grooves are arc-shaped, and the centers of the first grooves coincide with the center of the hub; the central angle β corresponding to the first grooves satisfies: 15° ≤ β ≤ 30°; Connecting lines are respectively drawn from the two ends in the length direction of the first groove to the center of the hub. The central angle α corresponding to the interval between adjacent two first grooves satisfies: 10° ≤ α ≤ 20°.

8. The axial fan according to any one of claims 1-7, characterized in that In the middle of the suction surface, there are also provided: A plurality of second grooves in the shape of polygons. When projected onto a plane perpendicular to the axis of the axial flow fan, the sides of the second grooves are all arc-shaped.

9. The axial fan according to claim 8, characterized in that The second grooves include: A first sub-groove, whose edges have a first side and a second side with centers both coinciding with the center of the hub. The first side is close to the hub, and the second side is close to the outer edge; 10. An air conditioner characterized by comprising: A second sub-groove, which is located between the leading edge and the first sub-groove. The edges of the second sub-groove have a fifth side and a sixth side with centers both coinciding with the center of the hub. The fifth side and the second side are on the same circle, and the sixth side is in the middle of the blade in the radial direction. Comprising a motor and an axial flow fan according to any one of claims 1-9, and an output shaft of the motor is connected to the hub of the axial flow fan.

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