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

Abstract

The present disclosure provides an axial flow fan blade, an axial flow fan and an air conditioner outdoor unit. The axial flow fan blade includes a blade and a drag reduction pattern structure arranged on the suction surface of the blade, the drag reduction pattern structure includes a plurality of drag reduction patterns extending along the span direction of the blade, and the plurality of drag reduction patterns are arranged side by side. The axial flow fan includes the axial flow fan blade. The drag reduction pattern structure of the axial flow fan blade can effectively destroy the boundary layer of the suction surface of the blade, which is beneficial to reduce the pressure difference resistance of the blade surface, realize the reduction of the overall resistance of the blade surface, and is beneficial to increase the air volume of the axial flow fan including the axial flow fan blade and reduce the power consumption of the axial flow fan.

Description

Technical Field

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

[0002] Axial flow blades are widely used in various fields of the national economy, such as air conditioner outdoor units. As the equipment where axial flow blades are located, such as air conditioner outdoor units, continues to demand miniaturization and low noise, the various components of these equipment, including axial flow inner blades, are also increasingly pursuing more lean design and higher product energy efficiency, which puts forward higher requirements and challenges for the aerodynamic performance and wind noise performance of axial flow fans and their axial flow blades. Summary of the invention

[0003] The purpose of the present disclosure is to provide an axial flow fan, an axial flow fan and an air conditioner outdoor unit, aiming to alleviate the problem that the pressure difference resistance on the blade surface of the axial flow fan is large and affects the aerodynamic performance.

[0004] A first aspect of the present disclosure provides an axial flow fan blade, comprising a blade and a drag reduction pattern structure arranged on the suction surface of the blade, the drag reduction pattern structure comprising a plurality of drag reduction patterns extending along the span direction of the blade, and the plurality of drag reduction patterns are arranged side by side.

[0005] In some embodiments, the ratio A / B of the projection area A of the region occupied by the drag reduction texture structure on the suction surface along the axial direction of the axial flow fan blade to the projection area B of the suction surface along the axial direction is in the range of [0.1, 0.5].

[0006] In some embodiments, the plurality of drag reduction patterns include a first drag reduction pattern, and the first drag reduction pattern includes at least one inflection point.

[0007] In some embodiments, at least a portion of the first drag reduction pattern includes more than two inflection points.

[0008] In some embodiments, the first drag reduction pattern is corrugated or curved.

[0009] In some embodiments, the first drag reduction pattern includes a plurality of bending segments connected in sequence, the bending segment includes a first sub-segment and a second sub-segment, one end of the first sub-segment is connected to one end of the second sub-segment and the first sub-segment and the second sub-segment form an angle α.

[0010] In some embodiments,

[0011] The length of the first sub-segment is a, and the range of a is [8mm, 20mm];

[0012] The length of the second sub-segment is b, and the range of b is [8mm, 20mm];

[0013] The range of the angle α is [60°, 120°].

[0014] In some embodiments, the plurality of drag reduction patterns further include a second drag reduction pattern, and the second drag reduction pattern is a linear drag reduction pattern.

[0015] In some embodiments, the drag reduction pattern structure includes two or more first drag reduction patterns arranged side by side.

[0016] In some embodiments,

[0017] The distance between at least two adjacent drag reduction patterns remains unchanged along the extension direction of the drag reduction patterns; and / or

[0018] The distance between at least two adjacent drag reduction patterns varies along the extension direction of the drag reduction patterns.

[0019] In some embodiments, every two adjacent drag reduction lines in the plurality of drag reduction lines form a distance, wherein:

[0020] At least two of the multiple distances formed by the multiple drag reduction lines are the same; and / or

[0021] At least two of the multiple distances formed by the multiple drag reduction patterns are different.

[0022] In some embodiments, the plurality of drag reduction stripes include convex stripes arranged on the suction surface and / or concave stripes arranged on the suction surface.

[0023] In some embodiments, the cross-sectional shape of the drag reduction pattern is a polygon, a curve, or a combination of a straight line and a curve.

[0024] In some embodiments, the cross-sectional shape of the drag reduction pattern is an isosceles triangle, the length c of the waist of the isosceles triangle is in the range of [1 mm, 5 mm], and the range of the vertex angle β is [5°, 45°].

[0025] A second aspect of the present disclosure provides an axial flow fan, comprising the axial flow fan blade described in the first aspect of the present disclosure.

[0026] A third aspect of the present disclosure provides an air-conditioning outdoor unit, comprising the axial flow fan described in the second aspect of the present disclosure.

[0027] Based on the axial flow fan blade provided by the present invention and based on the idea of ​​non-smooth surface drag reduction, a drag reduction pattern structure including a plurality of drag reduction patterns arranged side by side is provided on the suction surface of the blade, and the drag reduction patterns extend along the span direction of the blade, thereby forming a non-smooth pattern structure arranged along the airflow direction on the suction surface of the blade. The drag reduction pattern structure can effectively destroy the boundary layer of the suction surface, which is beneficial to reducing the pressure difference resistance on the blade surface, thereby achieving a decrease in the overall resistance of the blade surface. Therefore, it is beneficial to increase the air volume of the axial flow fan including the axial flow fan blade and reduce the power consumption of the axial flow fan.

[0028] The drag reducing patterns of the drag reducing pattern structure cause a phase difference in the time when the fluid flowing in the spanwise direction contacts the drag reducing pattern structure. The fluid forms stable small-scale vortex zones between the drag reducing patterns, making the noise induced by vortex zones of different scales present a more broadband characteristic. Therefore, the drag reducing pattern structure is also beneficial to reducing the noise generated by the operation of the axial flow fan blades and improving the sound quality.

[0029] The axial flow fan provided by the present disclosure has the same advantages as the axial flow fan blade of the present disclosure.

[0030] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0032] Figure 1 Schematic diagram of the structure of an axial flow fan blade according to an embodiment of the present disclosure.

[0033] Figure 2 This is a schematic diagram of the principle structure of the drag reduction pattern structure of an axial flow fan blade according to an embodiment of the present disclosure, in which the structure of a first drag reduction pattern is schematically shown.

[0034] Figure 3 This is a schematic structural diagram of a cross section of a first drag reduction pattern of a drag reduction pattern structure of an axial flow fan blade according to an embodiment of the present disclosure.

[0035] Figure 4 This is a schematic diagram of the axial structure of an axial flow fan blade according to an embodiment of the present disclosure, in which only the drag reduction pattern structure on one blade is schematically shown. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0037] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present disclosure. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0038] In the description of the present disclosure, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0039] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the directional words is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words 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 cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0040] like Figures 1 to 4 As shown, the embodiments of the present disclosure provide an axial flow fan blade and an axial flow fan having the axial flow fan blade, and an air conditioner outdoor unit having the axial flow fan.

[0041] like Figures 1 to 4 As shown, the axial flow fan blade includes a plurality of blades 1 and a hub 2, and the plurality of blades 1 are evenly arranged on the hub 2 along the circumference of the hub 2.

[0042] like Figures 1 to 4 As shown, the axial flow fan blade includes a blade 1 and a drag reduction pattern structure 12 arranged on the suction surface 11 of the blade 1. The drag reduction pattern structure 12 includes a plurality of drag reduction patterns extending along the blade span direction, and the plurality of drag reduction patterns are arranged side by side.

[0043] The axial flow fan blade of the embodiment of the present disclosure is based on the idea of ​​non-smooth surface drag reduction, and a drag reduction texture structure 12 is arranged on the suction surface 11 of the blade 1. The drag reduction texture structure 12 includes a plurality of drag reduction patterns arranged side by side, and the drag reduction patterns extend along the blade span direction, thereby forming a non-smooth texture structure arranged along the airflow direction on the suction surface 11 of the blade 1. The drag reduction texture structure 12 can destroy the boundary layer of the suction surface 11, which is conducive to reducing the pressure difference resistance of the blade surface, and then realizing the reduction of the overall resistance of the blade surface, therefore, it is conducive to increasing the air volume of the axial flow fan including the axial flow fan blade and reducing the power consumption of the axial flow fan.

[0044] The drag reducing patterns of the drag reducing pattern structure 12 cause a phase difference in the time when the fluid flowing in the spanwise direction contacts the drag reducing pattern structure 12. The fluid forms stable small-scale vortex zones between the drag reducing patterns, so that the noise induced by vortex zones of different scales exhibits a more broadband characteristic. Therefore, the drag reducing pattern structure 12 also enables the axial flow fan blade to reduce noise and improve sound quality.

[0045] like Figure 1 As shown, in some embodiments, the plurality of drag reduction lines include a first drag reduction line 121, and the first drag reduction line 121 includes at least one inflection point. Figure 1 As shown, in some embodiments, at least part of the first drag reduction pattern 121 includes at least two inflection points. Figure 1 and Figure 2 As shown, in some embodiments, the first drag reduction pattern 121 is corrugated. For example, in some embodiments not shown, the first drag reduction pattern 121 may be curved. The corrugated shape of the corrugated drag reduction pattern may be various waveforms or a combination of multiple waveforms, such as a triangular wave, a sine wave, etc.

[0046] The first drag reduction pattern 121 among the multiple drag reduction patterns includes at least one inflection point, so that at least part of the drag reduction patterns are folded along the span direction of the blade, which is beneficial for the drag reduction pattern structure 12 to allow the fluid to form more different small-scale vortex areas between the drag reduction patterns, thereby being more conducive to reducing the overall resistance of the blade surface or improving aerodynamic noise.

[0047] like Figure 2 As shown, in some embodiments, the first drag reduction pattern 121 includes a plurality of bending segments 1211 connected in sequence, the bending segment 1211 includes a first sub-segment and a second sub-segment, one end of the first sub-segment is connected to one end of the second sub-segment and the first sub-segment and the second sub-segment form an angle α.

[0048] like Figures 1 to 3As shown, in some embodiments, the drag reduction pattern structure 12 includes two or more first drag reduction patterns 121 arranged side by side. This arrangement is more conducive to the drag reduction pattern structure 12 allowing the fluid to form more different small-scale vortex areas between the drag reduction patterns, thereby being more conducive to reducing the overall drag of the blade surface or improving aerodynamic noise.

[0049] In some embodiments, the distance between at least two adjacent drag reduction patterns remains unchanged along the extension direction of the drag reduction patterns; and / or the distance between at least two adjacent drag reduction patterns varies along the extension direction of the drag reduction patterns.

[0050] In some embodiments, every two adjacent drag reduction lines among the plurality of drag reduction lines form a distance, wherein at least two of the plurality of distances formed by the plurality of drag reduction lines are the same; and / or at least two of the plurality of distances formed by the plurality of drag reduction lines are different.

[0051] In some embodiments, the plurality of drag reduction stripes include convex stripes disposed on the suction surface 11 and / or concave stripes disposed on the suction surface 11 .

[0052] In addition, if Figure 1 As shown, in some embodiments, in order to adapt to the shape of the axial flow fan blade, the drag reduction pattern structure 12 can better achieve the drag reduction effect in the area occupied by the suction surface 11, and the first drag reduction pattern 121 can also include a second drag reduction pattern 122, and the second drag reduction pattern 122 is a linear drag reduction pattern. The drag reduction pattern structure 12 can include a plurality of second drag reduction patterns arranged side by side.

[0053] In some embodiments, the cross-sectional shape of the drag reduction pattern may be a polygon, a curve, or a combination of a straight line and a curve.

[0054] The following combination Figures 1 to 4 The axial flow blade and the axial flow fan of the embodiment of the present disclosure are further described.

[0055] like Figure 1 As shown, a drag reduction pattern structure 12 is provided on the suction surface 11 of the blade 1 of the axial flow fan blade, and the drag reduction pattern structure 12 includes a plurality of drag reduction patterns arranged side by side and extending along the blade span direction. The plurality of drag reduction patterns include a plurality of first drag reduction patterns 121 arranged side by side and a plurality of second drag reduction patterns 122 arranged beside the plurality of first drag reduction patterns. The first drag reduction pattern 121 includes a plurality of inflection points. The second drag reduction pattern 122 is a linear drag reduction pattern.

[0056] The ratio A / B of the projection area A of the area occupied by the drag reducing texture structure 12 on the suction surface 11 along the axial direction of the axial flow blade to the projection area B of the suction surface 11 along the axial direction is in the range of [0.1, 0.5], for example, it can be 0.1, 0.2, 0.25, 0.32, 0.45 or 0.5.

[0057] like Figure 1 and Figure 2 As shown, the first drag reduction pattern 121 is corrugated. The first drag reduction pattern 121 includes a plurality of bending segments 1211 connected in sequence. The bending segment 1211 includes a first sub-segment and a second sub-segment. One end of the first sub-segment is connected to one end of the second sub-segment and the first sub-segment and the second sub-segment form an angle α.

[0058] like Figure 2 As shown, in some embodiments, the length of the first sub-segment is a, and the range of a is, for example, [8mm, 20mm], such as 8mm, 11mm, 12.5mm, 15mm, 18mm, 20mm, etc.; the length of the second sub-segment is b, and the range of b is, for example, [8mm, 20mm], such as 8mm, 10mm, 11mm, 13mm, 16.5mm, 20mm, etc.; the range of angle α is, for example, [60°, 120°], such as 60°, 70°, 85°, 90°, 110°, 120°, etc.

[0059] The sizes of different bending sections 1211 of the same first drag reduction pattern 121 may be the same or different. The length a of the first sub-segment and the length b of the second sub-segment of the same bending section 1211 may be the same or different. The size of each bending section 1211 of each first drag reduction pattern 121 and the positional relationship of adjacent bending sections 1211 may be set according to factors such as the blade shape and flow field of the axial flow fan blade.

[0060] like Figure 1 As shown, the distance between every two adjacent drag reduction lines remains unchanged along the extension direction of the drag reduction lines. The distance between every two adjacent drag reduction lines in the plurality of drag reduction lines is the same.

[0061] like Figure 1 and Figure 3 As shown, the plurality of drag reduction patterns are all convex patterns arranged on the suction surface 11 .

[0062] like Figure 3 As shown, the cross-sectional shape of each drag reduction pattern is an isosceles triangle. The length c of the waist of the isosceles triangle may range from [1 mm, 5 mm], such as 1 mm, 2 mm, 2.5 mm, 4 mm or 5 mm, etc., and the vertex angle β may range from [5°, 45°], such as 5°, 12°, 20°, 34°, 40°, 45°, etc.

[0063] The experimental comparison data of the axial flow fan blade with the drag reduction texture structure 12 according to an embodiment of the present disclosure and the ordinary fan blade of the same model without the drag reduction texture structure are as follows:

[0064]

[0065] Compared with ordinary fan blades, the axial flow fan blades of the embodiment of the present disclosure can achieve a larger air volume at the same speed. When the axial flow fan blades of the embodiment of the present disclosure and ordinary fan blades have the same air volume, the axial flow fan blades of the embodiment of the present disclosure can achieve lower motor power consumption.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present disclosure can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solution for protection requested by the present disclosure.

Claims

1. An axial flow fan blade, characterized in that: The invention comprises a blade (1) and a drag reduction pattern structure (12) arranged on a suction surface (11) of the blade (1), wherein the drag reduction pattern structure (12) comprises a plurality of drag reduction patterns extending along the span direction of the blade (1), the plurality of drag reduction patterns being arranged side by side, the plurality of drag reduction patterns comprising two or more first drag reduction patterns (121) arranged side by side and a plurality of second drag reduction patterns (122) arranged side by side, the first drag reduction pattern (121) comprising two or more inflection points, the second drag reduction pattern (122) being a linear drag reduction pattern, and the plurality of second drag reduction patterns (122) being located on a side of the plurality of first drag reduction patterns (121) close to a radial outer end of the blade to adapt to the shape of the axial flow fan blade.

2. The axial flow fan blade according to claim 1, characterized in that: The ratio A / B of a projection area A of an area occupied by the drag reduction pattern structure (12) on the suction surface (11) along the axial direction of the axial flow fan blade to a projection area B of the suction surface (11) along the axial direction is in the range of [0.1, 0.5].

3. The axial flow fan blade according to claim 1, characterized in that: The first drag reduction pattern (121) is in a corrugated or curved shape.

4. The axial flow fan blade according to claim 3, characterized in that: The first drag reduction pattern (121) comprises a plurality of bent segments (1211) connected in sequence, the bent segment (1211) comprising a first sub-segment and a second sub-segment, one end of the first sub-segment is connected to one end of the second sub-segment, and the first sub-segment and the second sub-segment form an angle α.

5. The axial flow fan blade according to claim 4, characterized in that: The length of the first sub-segment is a, and the range of a is [8mm, 20mm]; The length of the second sub-segment is b, and the range of b is [8mm, 20mm]; The range of the angle α is [60°, 120°].

6. The axial flow fan blade according to any one of claims 1 to 5, characterized in that: The distance between at least two adjacent drag reduction patterns remains unchanged along the extension direction of the drag reduction patterns; and / or The distance between at least two adjacent drag reduction patterns varies along the extension direction of the drag reduction patterns.

7. The axial flow fan blade according to any one of claims 1 to 5, characterized in that: Every two adjacent drag reduction lines in the plurality of drag reduction lines form a distance, wherein: At least two of the multiple distances formed by the multiple drag reduction lines are the same; and / or At least two of the multiple distances formed by the multiple drag reduction patterns are different.

8. The axial flow fan blade according to any one of claims 1 to 5, characterized in that: The plurality of drag reduction stripes include convex stripes arranged on the suction surface (11) and / or concave stripes arranged on the suction surface (11).

9. The axial flow fan blade according to any one of claims 1 to 5, characterized in that: The cross-sectional shape of the drag reduction pattern is a polygon, a curve, or a combination of a straight line and a curve.

10. The axial flow fan blade according to claim 9, characterized in that: The cross-sectional shape of the drag reduction pattern is an isosceles triangle, the length c of the waist of the isosceles triangle is in the range of [1 mm, 5 mm], and the range of the vertex angle β is [5°, 45°].

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

12. An air conditioner outdoor unit, characterized in that: Including the axial flow fan as described in claim 11.

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