Fan blade, wind wheel, fan, air conditioner outdoor unit and air conditioner

Abstract

The utility model relates to a fan blade, a wind wheel, a fan, an air conditioner outdoor unit and an air conditioner. A first arrangement area and a second arrangement area are arranged on the suction surface of the fan blade in the direction from the blade top to the blade root, the area of the first arrangement area is larger than that of the second arrangement area, and the fan blade comprises a plurality of first concave units arranged in the first arrangement area and a plurality of second concave units arranged in the second arrangement area. The area of the first recessed units is larger than that of the second recessed units. According to the technical scheme, the first concave units with the large area are arranged at the blade top position more sensitive to aerodynamic performance in a larger area range, more weight reduction is provided while airflow separation is restrained, and the first concave units with the large area are arranged at the blade root position which is connected with a hub and bears large loads and fatigue stress. And the second concave units with smaller areas are arranged in a smaller area range, so that the fan efficiency is improved, the weight is reduced to the greatest extent, and meanwhile, the structural strength of the fan blade is ensured.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of air conditioning equipment, and particularly relates to a fan blade, a fan wheel, a fan, an air conditioner outdoor unit and an air conditioner. BACKGROUND

[0002] The reasonable design of the fan blade has an important influence on the efficiency of the fan. In some related technologies, in order to improve the efficiency of the fan, a non-smooth structure is arranged on the suction surface of the fan, which plays a role in inhibiting airflow separation, and improves the efficiency of the fan to a certain extent. However, considering the high-strength operation environment of the fan blade, unreasonable distribution of the non-smooth structure may adversely affect the structural strength of the fan blade. CONTENT OF THE UTILITY MODEL

[0003] In order to overcome the problems in the related art, the present disclosure provides a fan blade, a fan wheel, a fan, an air conditioner outdoor unit and an air conditioner.

[0004] According to a first aspect of the embodiments of the present disclosure, a fan blade is provided, the suction surface of the fan blade is provided with a first layout area and a second layout area from the direction of the blade tip to the blade root, the area of the first layout area is greater than the area of the second layout area, the fan blade comprises a plurality of first recess units arranged in the first layout area and a plurality of second recess units arranged in the second layout area, wherein the area of the first recess unit is greater than the area of the second recess unit.

[0005] Optionally, the first recess unit is configured as a polygonal recess, and the second recess unit is configured as a circular recess.

[0006] Optionally, the first recess unit comprises a first sub-recess unit arranged adjacent to the blade tip position, the first sub-recess unit is configured as a quadrilateral, comprising a front contour line formed by offsetting the blade tip curve and a rear contour line, a left contour line formed by offsetting the leading edge curve, and a right contour line formed by offsetting the trailing edge curve.

[0007] Optionally, the offset distance of the left contour line relative to the leading edge curve is 10-15mm, and / or the offset distance of the right contour line relative to the trailing edge curve is 2-4mm.

[0008] Optionally, the recess depth of the first sub-recess unit is 0.25-0.75mm.

[0009] Optionally, the first recessed unit further comprises a plurality of second sub-recessed units arranged between the first sub-recessed unit and the second recessed unit, the area of the second sub-recessed unit is smaller than that of the first sub-recessed unit and larger than that of the second recessed unit, and the second sub-recessed unit is configured as a triangle and the bottom edge profile line is formed by offsetting from the leading edge curve or from the trailing edge curve.

[0010] Optionally, the plurality of second sub-recessed units are staggered arranged, and in any two adjacent second sub-recessed units, the position of the bottom edge profile line of the former second sub-recessed unit corresponds to the position of the vertex of the latter second sub-recessed unit.

[0011] Optionally, the bottom edge profile line of one of the second sub-recessed units adjacent to the second recessed unit is formed by offsetting inwardly from the trailing edge curve.

[0012] Optionally, the vertex of the second sub-recessed unit is circular arc-shaped.

[0013] Optionally, the offset distance of the bottom edge profile line of the second sub-recessed unit relative to the leading edge curve is 10-15mm, and / or the offset distance of the bottom edge profile line of the second sub-recessed unit relative to the trailing edge curve is 2-4mm.

[0014] Optionally, the recessed depth of the second sub-recessed unit is 1-3mm.

[0015] Optionally, the second recessed unit is configured as a circular recess, the radius of the second recessed unit is 2-4mm, and / or the recessed depth of the second recessed unit is 2-4mm.

[0016] Optionally, the second recessed unit is arranged at the trailing edge side of the fan blade, and the distribution area of the second recessed unit accounts for 3 / 4 of the area from the trailing edge to the leading edge.

[0017] Optionally, in the direction from the trailing edge to the leading edge, the distribution density of the plurality of second recessed units at the trailing edge is greater than that in the middle part.

[0018] Optionally, the first layout area accounts for 4 / 5 of the entire area of the fan blade.

[0019] According to a second aspect of the embodiments of the present disclosure, a wind wheel is provided, comprising a hub and a plurality of fan blades circumferentially spaced on the outer peripheral wall of the hub, and the fan blade is any one of the above-mentioned fan blades.

[0020] Optionally, the inner part of the hub is circumferentially spaced with a plurality of reinforcing ribs, the reinforcing ribs extend from the trailing edge of the previous fan blade to the leading edge of the next fan blade, and the reinforcing ribs are provided with notches, and the notches are in transition with the hub arc.

[0021] According to a third aspect of the embodiments of the present disclosure, a fan is provided, comprising the fan wheel of any one of the above.

[0022] According to a fourth aspect of the embodiments of the present disclosure, an outdoor unit of an air conditioner is provided, comprising the fan of any one of the above.

[0023] According to a fifth aspect of the embodiments of the present disclosure, an air conditioner is provided, comprising the outdoor unit of an air conditioner of any one of the above.

[0024] The technical solutions provided by the embodiments of the present disclosure can have the following beneficial effects: the fan blade provided by the present disclosure is provided with a recess unit on the suction surface, which plays a role in limiting vortex generation and suppressing airflow separation, and is conducive to improving fan efficiency and reducing aerodynamic noise. Specifically, the suction surface of the fan blade is provided with a first layout area and a second layout area in the direction from the blade tip to the blade root, the area of the first layout area is greater than the area of the second layout area, wherein the recess unit includes a first recess unit provided in the first layout area and a second recess unit provided in the second layout area, and the area of the first recess unit is greater than the area of the second recess unit. That is, the fan blade provided by the present disclosure, the blade tip position which is more sensitive to aerodynamic performance, is provided with a first recess unit with a larger area in a larger area range, which suppresses airflow separation while providing more weight reduction, while the blade root position which is connected with the hub and bears larger load and fatigue stress is provided with a second recess unit with a smaller area in a smaller area range, which improves fan efficiency and maximizes weight reduction while ensuring the structural strength of the fan blade.

[0025] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are incorporated into and form part of the specification, illustrate an embodiment consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure.

[0027] Figure 1 is a structural schematic diagram of a fan blade according to an exemplary embodiment.

[0028] Figure 2 is a structural schematic diagram of a fan wheel according to an exemplary embodiment.

[0029] Figure 3Fig. 2 is a structural schematic diagram of a wind wheel from another perspective according to an exemplary embodiment.

[0030] Legend of reference signs

[0031] 1 - fan blade, 11 - first recess unit, 111 - first sub-recess unit, 1111 - front profile line, 1112 - rear profile line, 1113 - left profile line, 1114 - right profile line, 112 - second sub-recess unit, 1121 - bottom edge profile line, 1122 - vertex, 12 - second recess unit, 13 - tip curve, 14 - leading edge curve, 15 - trailing edge curve, 2 - hub, 21 - reinforcing rib, 211 - notch. DETAILED DESCRIPTION

[0032] The exemplary embodiments will be described in detail herein with reference to the accompanying drawings. In the following description, the same drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present disclosure. Instead, they are merely examples of apparatuses and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0033] As Figures 1 to 3 shown, the exemplary embodiments of the present disclosure provide a fan blade 1. The fan blade 1 is suitable for the application scenarios of the axial flow fan of the air conditioner outdoor unit, or industrial fan, and fan, etc. Specifically, the suction surface of the fan blade 1 provided by the present disclosure is provided with a first layout area A and a second layout area B from the tip to the root, the area of the first layout area A is greater than the area of the second layout area B, the fan blade 1 includes a plurality of first recess units 11 arranged in the first layout area A and a plurality of second recess units 12 arranged in the second layout area B, wherein the area of the first recess unit 11 is greater than the area of the second recess unit.

[0034] The suction surface can also be called the negative pressure surface or the air inlet surface. When the airflow passes through the suction surface, due to the excessive curvature of the blade surface or the uneven distribution of airflow velocity, the fluid in the boundary layer may lose kinetic energy, causing the airflow to separate from the blade surface, thereby forming a vortex area, which is easy to cause flow separation, resulting in problems such as fan efficiency decline and noise increase.

[0035] The present disclosure provides a recess unit on the suction surface, which can disperse the originally concentrated vortex into a plurality of small-scale vortices. The dispersed vortices are more easily carried away by the main airflow, thereby avoiding accumulation on the blade surface. At the same time, the recess unit can change the local pressure distribution and flow velocity distribution of the blade surface, so that the fluid in the boundary layer can adhere to the blade surface for a longer time, effectively delaying the occurrence of boundary layer separation.

[0036] It should be noted that the recess unit here refers to an independent recess structure, which can be a polygonal recess or a circular recess to be introduced later. The area of the recess unit refers to the area occupied by the projection of the recess unit in the direction of the suction surface. It should also be noted that the area of the layout region refers to the area of the region for laying the recess unit on the suction surface, combined with the drawings Figure 2 For example, the dashed box A is the first layout region, and the dashed box B is the second layout region, wherein the area of the first layout region A is greater than the area of the second layout region B, which means that the area for laying the first recess unit 11 on the suction surface is greater than the area for laying the second recess unit 12.

[0037] By providing the recess unit on the fan blade 1, on the one hand, the fan efficiency and the reduction of aerodynamic noise can be improved, and on the other hand, the weight of the fan blade 1 can be reduced due to the subtractive manufacturing process of the recess. However, considering the high-strength operating environment of the fan blade 1, unreasonable distribution of the recess unit may adversely affect the structural strength of the fan blade. Specifically, the position close to the tip of the fan blade 1 is weak in strength but sensitive to aerodynamic performance, while the position close to the root of the fan blade 1 is connected with the hub and bears large load and fatigue stress, so compared with the tip, the area near the root is not suitable for setting a large area of weight reduction.

[0038] The fan blade 1 provided by the present disclosure has an area of the first layout region A greater than an area of the second layout region B, and an area of the first recess unit 11 greater than an area of the second recess unit 12. That is, the tip position which is more sensitive to aerodynamic performance is provided with a large-area first recess unit 11 in a larger area range, which suppresses airflow separation and provides more weight reduction, while the root position which is connected with the hub and bears large load and fatigue stress is provided with a small-area second recess unit 12 in a smaller area range, which improves fan efficiency and maximizes weight reduction while ensuring the structural strength of the fan blade 1.

[0039] The first recess unit 11 and the second recess unit 12 can be constructed in the same shape or different shapes according to design needs. For example, the first recess unit 11 is constructed as a polygonal recess, and the second recess unit 12 is constructed as a circular recess. The shape, size and layout position of the first recess unit 11 and the second recess unit 12 will be described exemplarily below.

[0040] In some embodiments, as Figure 1As shown, the first concave unit 11 comprises a first sub-concave unit 111 disposed adjacent to the position of the blade tip. The first sub-concave unit 111 can be configured as a quadrilateral, comprising a front profile line 1111 and a rear profile line 1112 formed by offsetting the blade tip curve 13, a left profile line 1113 formed by offsetting the leading edge curve 14, and a right profile line 1114 formed by offsetting the trailing edge curve 15. That is, the front profile line 1111 and the rear profile line 1112 of the first sub-concave unit 111 are concentrically arranged with the blade tip curve 13. The first sub-concave unit 111 of such configuration can best fit the shape of the fan blade 1, obtain a larger concave unit area, and improve the effect of suppressing airflow separation. The first sub-concave unit 111 adjacent to the position of the blade tip here can be one or several of the nearest to the blade tip among the plurality of first concave units 11. In embodiments comprising several first sub-concave units 111, the several first sub-concave units 111 can be disposed at intervals in the direction from the blade tip to the blade root, or can be disposed at intervals in the direction from the leading edge to the trailing edge.

[0041] In order to obtain a larger weight reduction area while ensuring the structural strength of the fan blade 1, in some embodiments, the left profile line 1113 can be configured to have an offset distance of 10-15mm with respect to the leading edge curve 14, and / or the right profile line 1114 can be configured to have an offset distance of 2-4mm with respect to the trailing edge curve 15. The offset distances may, for example, be reasonably set according to the shape of the fan blade 1 and the distribution of the maximum stress points during operation, etc. In addition, the concave depth of the first sub-concave unit 111 can be configured to be 0.25-0.75mm. By configuring the depth of the first sub-concave unit 111 within a reasonable range, the effect of suppressing airflow separation can be improved while not affecting the strength of the fan blade 1.

[0042] As shown in FIG. 2, the first concave unit 11 comprises a first sub-concave unit 111 disposed adjacent to the position of the blade tip. The first sub-concave unit 111 can be configured as a quadrilateral, comprising a front profile line 1111 and a rear profile line 1112 formed by offsetting the blade tip curve 13, a left profile line 1113 formed by offsetting the leading edge curve 14, and a right profile line 1114 formed by offsetting the trailing edge curve 15. That is, the front profile line 1111 and the rear profile line 1112 of the first sub-concave unit 111 are concentrically arranged with the blade tip curve 13. The first sub-concave unit 111 of such configuration can best fit the shape of the fan blade 1, obtain a larger concave unit area, and improve the effect of suppressing airflow separation. The first sub-concave unit 111 adjacent to the position of the blade tip here can be one or several of the nearest to the blade tip among the plurality of first concave units 11. In embodiments comprising several first sub-concave units 111, the several first sub-concave units 111 can be disposed at intervals in the direction from the blade tip to the blade root, or can be disposed at intervals in the direction from the leading edge to the trailing edge. Figure 1As shown, in some embodiments, the first recessed unit 11 further comprises a plurality of second sub-recessed units 112 disposed between the first sub-recessed units 111 and the second recessed unit 12, the area of the plurality of second sub-recessed units 112 is smaller than the area of the first sub-recessed units 111 and larger than the area of the second recessed unit 12, wherein the second sub-recessed units 112 are configured as triangles and the bottom edge contour line 1121 is formed by offsetting from the leading edge curve 14 or from the trailing edge curve 15. The shape of the fan blade itself has an important influence on the aerodynamic performance, for example, the trailing edge is the position where the airflow leaves, and has a greater influence on the generation of vortex, therefore some fan blades in the related art are provided with a serrated structure at the position of the trailing edge, therefore configuring the second sub-recessed units 111 as triangles is conducive to avoiding these design structures, so as to maximize the fit of the shape of the fan blade 1, obtain a larger recessed unit area, and improve the effect of suppressing airflow separation. In addition, the vertex 1122 of the second sub-recessed unit 112 can be configured as a circular arc to further improve the effect of the second sub-recessed unit 112 in suppressing airflow separation.

[0043] Further, the plurality of second sub-recessed units 112 can be staggered, wherein in the adjacent two second sub-recessed units 112, the position of the bottom edge contour line 1121 of the former second sub-recessed unit 112 corresponds to the position of the vertex 1122 of the latter second sub-recessed unit 112. This staggered arrangement can be intuitively understood as two triangles being spliced to form a parallelogram, leaving as little non-recessed space as possible between the adjacent two second sub-recessed units 112, further conducive to increasing the setting area of the recessed unit, in addition, the staggered second sub-recessed units 112 are also conducive to improving the uniformity of the airflow flowing through the blade surface.

[0044] Considering that the leading edge bears greater airflow impact than the trailing edge, in some embodiments, as shown, Figure 1 As shown, the bottom edge contour line 1121 of one of the plurality of second sub-recessed units 112 adjacent to the second recessed unit 12 is formed by offsetting inward from the trailing edge curve 15, that is, the setting area of the second sub-recessed unit 112 near the root position gradually decreases from the trailing edge to the leading edge direction, which improves the aerodynamic performance while taking into account weight reduction and ensuring the structural strength of the fan blade.

[0045] In some embodiments, the second sub-recessed unit 112 is configured as a circular recess, and the radius of the second sub-recessed unit 112 is 2-4 mm, and / or the recessed depth of the second sub-recessed unit 112 is 2-4 mm. By reasonably setting the shape and size of the second sub-recessed unit 112, the effect of the second sub-recessed unit 112 in suppressing airflow separation can be improved.

[0046] In some embodiments, as shown in FIG. 2, the second recessed unit 12 is configured as a circular recess, and the radius of the second recessed unit 12 is 2-4 mm, and / or the recessed depth of the second recessed unit 12 is 2-4 mm. By reasonably setting the shape and size of the second recessed unit 12, the effect of the second recessed unit 12 in suppressing airflow separation can be improved. Figure 1

[0047] The second recessed unit 12 can be arranged on the trailing edge side of the fan blade 1, and the distribution area of the second recessed unit 12 accounts for 3 / 4 of the area from the trailing edge to the leading edge. Specifically, considering that the leading edge directly bears the impact of airflow, the second recessed unit 12 can be arranged away from the position of the leading edge, or in other words, the second recessed unit 12 does not extend to the position of the leading edge. By making the distribution area of the second recessed unit 12 account for 3 / 4 of the area from the trailing edge to the leading edge, or in other words, leaving 1 / 4 of the position near the leading edge for the second recessed unit 12, the effect of suppressing airflow separation can be improved while ensuring the structural strength of the fan blade 1.

[0048] In addition, the second recessed unit 12 can be uniformly distributed in density on the fan blade 1, or the second recessed unit 12 can also be unevenly distributed in density on the fan blade 1. Taking the uneven distribution of the second recessed unit 12 as an example, in the direction from the trailing edge to the leading edge, the distribution density of the second recessed unit 12 at the trailing edge can be greater than the distribution density in the middle. This uneven density distribution can improve the effect of suppressing airflow separation while ensuring the structural strength of the fan blade 1.

[0049] In some embodiments, as shown in FIG. 2, the second recessed unit 12 is configured as a circular recess, and the radius of the second recessed unit 12 is 2-4 mm, and / or the recessed depth of the second recessed unit 12 is 2-4 mm. By reasonably setting the shape and size of the second recessed unit 12, the effect of the second recessed unit 12 in suppressing airflow separation can be improved. Figure 2 ​The first layout area can be configured to occupy 4 / 5 of the entire fan blade 1 area. For example, during the design of the fan blade 1, the fan blade 1 can be divided into five parts from the tip to the root, specifically: a tip area, a near-tip area, a middle area, a near-root area, and a root area. The four parts from the tip area to the near-root area can be used as the first layout area, and the root area can be used as the second layout area, so as to reduce the weight of the fan blade 1 while ensuring the structural strength of the fan blade 1.

[0050] According to a second aspect of the embodiments of the present disclosure, as shown in Figure 2 and Figure 3 Further provided is a fan wheel, comprising a hub 2 and a plurality of fan blades 1 circumferentially and spaced apart on the outer peripheral wall of the hub 2, the fan blades 1 being any one of the above fan blades and having all the beneficial effects thereof, which will not be repeated here.

[0051] In some embodiments, as shown in Figure 3 The inside of the hub 2 is circumferentially and spaced apart by a plurality of reinforcing ribs 21, the reinforcing ribs 21 extending from the trailing edge of the previous fan blade 1 to the leading edge of the next fan blade 1, and the reinforcing ribs 21 are provided with notches 211, the notches 211 being arc transitions with the hub 2. This not only ensures the structural strength of the hub 2, but also effectively saves the consumption of the hub 2, further reducing the weight of the impeller. In addition, the arc transition can also avoid stress concentration, further improving the structural strength.

[0052] According to a third aspect of the embodiments of the present disclosure, further provided is a fan, comprising the fan wheel of any one of the above.

[0053] According to a fourth aspect of the embodiments of the present disclosure, further provided is an outdoor unit of an air conditioner, comprising the fan of any one of the above.

[0054] According to a fifth aspect of the embodiments of the present disclosure, further provided is an air conditioner, comprising the outdoor unit of an air conditioner of any one of the above.

[0055] In the detailed description above, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration specific aspects in which the disclosure can be practiced. In this regard, directional terminology, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and other commonly used terms, are used herein for the purpose of illustration only and are not intended to be limiting. Because the described devices can be positioned in a number of different orientations, the directional terminology can be used for illustration purposes only and is not limiting. It is to be understood that other aspects can be utilized and structural or logical changes can be made without departing from the scope of the present disclosure. The following detailed description, therefore, is not to be taken in a limiting sense.

[0056] It is to be understood that the features of the various aspects of the disclosure described herein can be combined with each other, unless specifically noted otherwise. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items; similarly, "at least one of' includes any and all combinations of one or more of the associated listed items.

[0057] It should be understood that, unless otherwise specifically stated and limited, the terms "joined," "attached," "mounted," "connected," "linked," "fixed" and the like, as used in the embodiments of the disclosure, are to be construed broadly, e.g., as either fixed connections, or as removable connections, or as integral connections; as either mechanical connections, or as electrical connections, or as communicative connections with each other; as either direct connections, or as indirect connections via intervening mediums; as internal communication or interaction between two elements, or as interaction between two elements, unless specifically and explicitly limited otherwise. The specific meaning of the above terms in this document can be understood by those of ordinary skill in the art according to the specific context.

[0058] Further, the word "over" as used in reference to a component, element, or material layer "over" another component, element, or material layer, is used herein to mean that the component, element, or material layer is positioned "indirectly" on the other component, element, or material layer such that one or more additional components, elements, or layers are arranged between the other component, element, or material layer and the component, element, or material layer. However, the word "over" as used in reference to a component, element, or material layer "over" another component, element, or material layer, can optionally also mean that the component, element, or material layer is positioned "directly" on the other component, element, or material layer, e.g., in direct contact with the other component, element, or material layer.

[0059] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited to these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, part, region, layer, or section mentioned in the examples may also be referred to as the second component, part, region, layer, or section. Furthermore, 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 indicated technical features. Thus, a feature defined as “first” or “second” may explicitly or implicitly include at least one of that feature. In the description herein, “a plurality” means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] It should be understood that spatial relative terms, such as “above,” “upper,” “below,” and “lower,” are used herein to describe the relationship between one element and another shown in the figures. In addition to the orientation depicted in the figures, these spatial relative terms are also intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as “above” or “upper” relative to another element would be “below” or “lower” relative to that other element. Thus, depending on the spatial orientation of the device, the term “above” encompasses both above and below orientations. Devices may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0061] Furthermore, the term “exemplary” is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as “exemplary” is not necessarily to be construed as advantageous compared to other aspects or designs. Rather, the use of the term “exemplary” is intended to present the concept in a concrete manner. As used herein, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless otherwise specified or clear from the context, “X applies A or B” is intended to mean any of the natural inclusive arrangements. That is, “X applies A or B” satisfies any of the foregoing instances if X applies A; X applies B; or both X applies A and B. Additionally, unless otherwise specified or clear from the context to refer to the singular form, the articles “a” and “an” as used in this application and the appended claims are generally understood to mean “one or more.”

[0062] Likewise, although the present disclosure has been described and illustrated with respect to one or more implementations, equivalent alterations and modifications will become apparent to those skilled in the art that do not depart from the true spirit and scope of the disclosure. The present disclosure includes all such modifications and alterations and is limited only by the scope of the following claims. In particular regard to the various functions performed by the above described components (e.g., elements, resources, etc.), the terms (including a reference to a "means") used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the described function (e.g., a functional equivalent), even though not structurally equivalent to the disclosed structure. In addition, although a particular feature of the disclosure can have been disclosed with respect to only one of several implementations, other implementations can include the particular feature. For example, the disclosure can be implemented with respect to other implementations that incorporate the particular feature, and that implement other features as disclosed herein, and each of the various implementations have a reasonable expectation of support. Furthermore, to the extent that the terms "includes", "including", "has", "have", "having", or variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term "comprising".

[0063] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the features of the disclosure disclosed herein. It is intended that the present disclosure be considered as including any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such steps, compositions, components, and / or elements known in the art to be appropriate. It is specifically intended that the present disclosure include all such modifications and alterations in the application, matter, and scope of the disclosure as fall within the usual practice of the art and are equated with the principles of the disclosure. The specification and examples are to be considered exemplary only, with the true scope and spirit of the disclosure being indicated by the following claims.

[0064] It is to be understood that the present disclosure is not limited to the precise construction described and shown herein and that changes can be made in various details without departing from the scope of the disclosure. The scope of the present disclosure is limited only by the claims appended hereto.

Claims

1. A wind turbine blade, c h a r a c t e r i s e d in that The suction surface of the fan blade is provided with a first layout area and a second layout area from the blade tip to the blade root, the area of the first layout area is larger than the area of the second layout area, the fan blade comprises a plurality of first recess units arranged in the first layout area and a plurality of second recess units arranged in the second layout area, wherein the area of the first recess unit is larger than the area of the second recess unit.

2. The wind turbine blade of claim 1, wherein, The first recess unit is configured as a polygonal recess, and the second recess unit is configured as a circular recess.

3. The wind turbine blade of claim 1, wherein, The first recess unit comprises a first sub-recess unit arranged adjacent to the blade tip position, the first sub-recess unit is configured as a quadrilateral, comprising a front contour line formed by offsetting from the blade tip curve, a rear contour line formed by offsetting from the blade tip curve, a left contour line formed by offsetting from the leading edge curve, and a right contour line formed by offsetting from the trailing edge curve.

4. The wind turbine blade of claim 3, wherein, The offset distance of the left contour line relative to the leading edge curve is 10-15mm, and / or the offset distance of the right contour line relative to the trailing edge curve is 2-4mm.

5. The wind turbine blade of claim 3, wherein, The recess depth of the first sub-recess unit is 0.25-0.75mm.

6. The wind turbine blade of claim 3, wherein, The first recess unit further comprises a plurality of second sub-recess units arranged between the first sub-recess unit and the second recess unit, the area of the plurality of second sub-recess units is smaller than the area of the first sub-recess unit and larger than the area of the second recess unit, wherein the second sub-recess unit is configured as a triangle and the bottom edge contour line is formed by offsetting from the leading edge curve or from the trailing edge curve.

7. The wind turbine blade of claim 6, wherein, The plurality of second sub-recess units are arranged staggered, wherein in the two adjacent second sub-recess units, the bottom edge contour line position of the former second sub-recess unit corresponds to the vertex position of the latter second sub-recess unit.

8. The wind turbine blade of claim 6, wherein, The bottom edge contour line of the second sub-recess unit adjacent to one of the second recess units is formed by inward offsetting from the trailing edge curve.

9. The wind turbine blade of claim 6, wherein, The vertex of the second sub-recess unit is in a circular arc shape.

10. The wind turbine blade of claim 6, wherein, The offset distance of the bottom edge contour line of the second sub-recess unit relative to the leading edge curve is 10-15mm, and / or the offset distance of the bottom edge contour line of the second sub-recess unit relative to the trailing edge curve is 2-4mm.

11. The wind turbine blade of claim 6, wherein, The recess depth of the second sub-recess unit is 1-3mm.

12. The wind turbine blade of claim 1, wherein, The second recess unit is configured as a circular recess, the radius of the second recess unit is 2-4mm, and / or the recess depth of the second recess unit is 2-4mm.

13. The wind turbine blade of claim 12, wherein, The second recess unit is arranged on the trailing edge side of the fan blade, and the distribution area of the second recess unit accounts for 3 / 4 of the area from the trailing edge to the leading edge.

14. The wind turbine blade of claim 13, wherein, In the direction from the trailing edge to the leading edge, the distribution density of the plurality of second recess units at the trailing edge is greater than the distribution density in the middle part.

15. The wind turbine blade of claim 1, wherein, The first layout area accounts for 4 / 5 of the entire area of the fan blade.

16. A wind wheel, characterized in that The fan wheel comprises a hub and a plurality of fan blades arranged on the outer peripheral wall of the hub in a circumferential direction, and the fan blade is the fan blade according to any one of claims 1-15.

17. The wind wheel of claim 16, wherein, The inner part of the hub is provided with a plurality of reinforcing ribs in a circumferential interval, the reinforcing ribs extending from the trailing edge of a previous fan blade to the leading edge of a next fan blade, and the reinforcing ribs are provided with notches, and the notches are in transition with the hub arc.

18. A fan, comprising: The wind wheel comprises the fan blade according to any one of claims 1-15.

19. An air conditioner outdoor unit, characterized by comprising: The fan comprises the fan blade according to claim 18.

20. An air conditioner characterized by comprising: The air conditioner outdoor unit comprises the fan blade according to claim 19.

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