Air outlet grille, axial flow fan and air conditioner outdoor unit

Abstract

The utility model discloses an air outlet grille, an axial flow fan and an air conditioner outdoor unit. The air outlet grille comprises a center piece (3), an annular outer bezel (2) surrounding the center piece (3); the multiple first radial ribs (1) are distributed in the circumferential direction of the center piece (3) at intervals and extend between the center piece (3) and the outer frame (2), each first radial rib (1) comprises a notch (11) formed in the end face of the downstream side of the corresponding first radial rib (1) in the air outlet direction, and each notch (11) is concaved towards the upstream in the air outlet direction; and the plurality of annular ribs (4) are connected with the plurality of first radial ribs (1) and are arranged between the central piece (3) and the outer frame (2) in a manner of surrounding the central piece (3).

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an air outlet grille, an axial flow fan and an air conditioning outdoor unit. Background Art

[0002] The increasing use of air conditioners has led to higher demands for cooling and heating performance and noise reduction. The air outlet grille is a key component of the air conditioner's outdoor unit. Its structure affects the air volume and noise of the outdoor unit, which in turn affects people's experience of air conditioning comfort. Summary of the Invention

[0003] The purpose of the utility model is to provide an air outlet grille which helps to increase air volume and reduce noise.

[0004] The first aspect of the utility model discloses an air outlet grille, comprising:

[0005] centerpiece;

[0006] an annular outer frame surrounding the center piece;

[0007] a plurality of first radial ribs spaced apart along the circumference of the center piece and extending between the center piece and the outer frame, the first radial ribs including notches provided on end surfaces on downstream sides of the first radial ribs along an air outlet direction, the notches being recessed toward upstream along the air outlet direction;

[0008] A plurality of annular ribs are connected to the plurality of first radial ribs and are arranged between the central piece and the outer frame so as to surround the central piece.

[0009] In some embodiments, the notches of the multiple first radial ribs are distributed along multiple distribution curve segments intersecting with the first radial ribs, and the notches are provided at the intersections of the distribution curve segments and the first radial ribs; the distribution curve segments gradually move away from the center piece from the starting point to the end point, and along the extension path from the starting point to the end point of the distribution curve segment, the extension direction of the distribution curve segment deviates toward the same deviation side relative to the radial direction of the air outlet grille from the center piece to the outer frame toward the outside, and the deviation sides of the multiple distribution curve segments are the same.

[0010] In some embodiments, the plurality of distribution curve segments are distributed along the circumference of the center piece, and the same first radial rib intersects two of the distribution curve segments simultaneously.

[0011] In some embodiments, the number of the plurality of distribution curve segments is the same as the number of blades of the axial flow fan to which the air outlet grille is applied.

[0012] In some embodiments, the number of the plurality of distribution curve segments is 3.

[0013] In some embodiments, the distribution curve segment is a spiral segment.

[0014] In some embodiments, along the extension path from the end of the first radial rib close to the center piece to the end away from the center piece, the extension direction of the first radial rib deviates toward the same deviation side relative to the radial direction of the air outlet grille from the center piece to the outer frame toward the outside, and the deviation sides of the multiple first radial ribs are the same.

[0015] In some embodiments, the center piece includes an annular inner frame, a center portion and a plurality of second radial ribs arranged around the center portion, the first radial ribs extending between the inner frame and the outer frame, the second radial ribs extending between the center portion and the inner frame, along the extension path from the end of the second radial rib close to the center piece to the end away from the center piece, the extension direction of the second radial ribs deviates to the same deviation side relative to the radial direction of the air outlet grille from the center piece to the outer frame, and the deviation sides of the plurality of second radial ribs are the same, and the deviation side of the second radial rib is opposite to the deviation side of the first radial rib.

[0016] In some embodiments, along the radial direction outward from the center piece of the air outlet grille to the outer frame, the annular rib includes an outer surface located radially outside thereof and an inner surface located radially inside thereof opposite to the outer surface, and the points on the edge line on the downstream side along the air outlet direction of the outer surface and / or inner surface of the annular rib are at different positions along the air outlet direction.

[0017] In some embodiments, the edge line of the outer surface and / or the inner surface of the annular rib on the downstream side along the air outlet direction includes a spiral line segment spiraling around the air outlet direction.

[0018] In some embodiments, the edge line of the outer surface and / or inner surface of the annular rib on the downstream side along the air outlet direction includes multiple spiral line segments of the same shape, and the number of the multiple spiral line segments of the same shape is the same as the number of blades of the axial flow fan using the air outlet grille.

[0019] In some embodiments, positions of the end surfaces of the downstream sides of the plurality of adjacent annular ribs along the air outlet direction are all different in the circumferential direction of the center piece.

[0020] A second aspect of the utility model discloses an axial flow fan, comprising blades and any one of the above-mentioned air outlet grilles.

[0021] A third aspect of the utility model discloses an air-conditioning outdoor unit, comprising any of the above-mentioned air outlet grilles.

[0022] Based on the air outlet grille provided by the utility model, a notch recessed upstream is set on the end face on the downstream side of the first radial rib extending between the outer frame and the center piece along the air outlet direction. When the wind formed by the fan flows out through the first radial rib, the vortex generated by the outlet airflow flowing along the surface of the first radial rib when it leaves the first radial rib can be broken up by the notch, reducing the generation of vortex, thereby reducing energy loss and reducing the noise generated when the vortex falls off, thereby increasing the air volume and reducing noise.

[0023] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 This is a schematic structural diagram of the air outlet grille according to an embodiment of the present utility model;

[0026] Figure 2 for Figure 1 A schematic structural diagram of the air outlet grille from another angle shown;

[0027] Figure 3 for Figure 1 A schematic cross-sectional view of the air outlet grille shown;

[0028] Figure 4 for Figure 1 A schematic structural diagram of a portion of the air outlet grille shown;

[0029] Figure 5 for Figure 1 A schematic structural diagram of the center piece of the air outlet grille shown;

[0030] Figure 6 This is a structural schematic diagram of an air outlet grille according to another embodiment of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the 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 the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0033] In the description of the present invention, it should be understood that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0034] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0035] For ease of description, spatially relative terms such as "above," "above," "on the upper surface of," and "upper" may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in a drawing is inverted, a device described as "above" or "on top of" another device or structure would then be positioned as "below" or "below" the other device or structure. Thus, the exemplary term "above" can include both the "above" and "below" orientations. The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0036] like Figures 1 to 6 As shown, the air outlet grille of this embodiment includes a center piece 3, an annular outer frame 2, a plurality of first radial ribs 1 and a plurality of annular ribs 4.

[0037] In the embodiment shown in the figure, the annular outer frame 2 is a circular structure, the center piece 3 is a circular structure, the outer frame 2 surrounds the center piece 3, and the outer frame 2 and the center piece 3 are coaxially arranged.

[0038] A plurality of annular ribs 4 are connected to the plurality of first radial ribs 1 , and the annular ribs 4 surround the central piece 3 and are disposed between the central piece 3 and the outer frame 2 .

[0039] A plurality of first radial ribs 1 are distributed at intervals along the circumference of the center piece 3, and the first radial ribs 1 extend between the center piece 3 and the outer frame 2. The first radial rib 1 includes a notch 11 provided on the end face on the downstream side of the first radial rib 1 along the air outlet direction, and the notch 11 is recessed upstream along the air outlet direction. The air outlet direction refers to the overall direction of the air flow through the air outlet grille, that is, the direction from one side of the air outlet grille to the other side along the axis 30 of the air outlet grille. In the embodiment where the center piece is a circular structural piece as shown in the figure, the axis of the center piece is also the axis 30 of the air outlet grille. Figure 1 and Figure 3 In the embodiment shown, the direction indicated by the arrow is the air outlet direction of the air outlet grille. Figure 1The air outlet grille shown has an air outlet direction generally pointing from the inside of the paper to the outside of the paper, with the arrow pointing downstream in the air outlet direction. The first radial rib 1 extends from the center piece to the outer frame. As shown in the figure, the notch of the first radial rib is through in a direction perpendicular to the air outlet direction. In the embodiment shown in the figure, the notch is a V-shaped notch, and the opening direction of the V-shaped notch is toward the downstream in the air outlet direction. In the air outlet grille of this embodiment, when the wind blown out by the fan passes through the first radial rib, the air flow flowing along the surface of the first radial rib 1 will generate some vortices due to the boundary layer effect when it leaves the first radial rib 1. The notch 11 on the end face on the downstream side of the first radial rib 1 will interfere with the generation of the vortex and break up the generated vortex, reducing the generation of the vortex, thereby reducing energy loss and reducing the noise generated when the vortex falls off, increasing the air volume and reducing the noise.

[0040] In some embodiments, as Figure 1 、 Figure 2 and Figure 6 As shown, the notches 11 of the multiple first radial ribs 1 are distributed along multiple distribution curve segments 51 intersecting the first radial ribs 1, and the intersections of the distribution curve segments 51 and the first radial ribs 1 are provided with notches 11; the distribution curve segments 51 gradually move away from the center piece 3 from the starting point to the end point, and along the extension path from the starting point to the end point of the distribution curve segment 51, the extension direction of the distribution curve segment 51 deviates from the radial direction of the air outlet grille from the center piece 3 to the outer frame 2 toward the same deviation side, and the deviation sides of the multiple distribution curve segments 51 are the same. Figure 6 As shown, the distribution curve segment 51 is a design line segment. During the design, the distribution curve segment 51 is used to arrange the position of the notch on the first radial rib. The distribution curve segment 51 is designed to intersect with multiple first radial ribs, such as Figure 6 As shown, a notch 11 is arranged at the position intersecting with the first radial rib. When designing the distribution curve segment, the starting point of the distribution curve segment is from the outer surface of the center piece or from a position close to the outer surface of the center piece, and then extends toward the outer frame 2, gradually moving away from the center piece during the extension process, that is, the point of the distribution curve segment is farther and farther away from the center piece during the extension process; the radial direction of the air outlet grille from the center piece 3 to the outer frame 2 toward the outside refers to the radial direction of the air outlet grille from the radial inside to the radial outside, that is, Figure 1The axis 30 of the air outlet grille points to the radial direction of the outer frame; the extension direction of the distribution curve segment 51 deviates to the same deviation side relative to the radial direction of the air outlet grille from the center piece 3 to the outer frame 2, that is, in the extension process of the distribution curve segment 51 starting from the starting point, the extension direction of each point (that is, the tangent direction passing through the point along the extension path) deviates to the same deviation side relative to the radial direction toward the outside (that is, the radial direction toward the outside passing through the point), and correspondingly, the extension direction of each point deviates counterclockwise or clockwise relative to the radial direction toward the outside. From the reader's perspective, Figure 6 The radial deviation sides of each point toward the outside are shown as left and right, which correspond to the counterclockwise deviation and the clockwise deviation, respectively. Figure 6 In the embodiment shown, from the reader's perspective, the extension direction of each point deviates to the left relative to the radial direction toward the outside, that is, deviates in the counterclockwise direction. Figure 6 As shown, the deviation sides of the multiple distribution curve segments 51 are the same, that is, the deviation sides of the extension direction of each distribution curve segment relative to the radial direction toward the outside of the point during the extension process are the same. Figure 6 In the figure, the points of each distribution curve segment 51 deviate counterclockwise from the reader's perspective during the extension process. The wind output by the axial flow fan has not only axial velocity but also circumferential velocity, i.e., the flow of the wind output by the axial flow fan is approximately spiral. Since the axial flow fan generates the outlet airflow through the rotation of multiple blades, the outlet airflow blowing out of the air outlet grille also flows in multiple spirals. This embodiment designs multiple distribution curve segments, and the shape of the distribution curve segments better matches the flow of the outlet airflow through the air outlet grille. Since the notches are distributed along the distribution curve segments, the distribution of the notches also better matches the flow of the outlet airflow, thereby better matching the flow of the outlet airflow, thereby improving the effect of increasing the air volume and reducing noise of the outlet airflow.

[0041] In some embodiments, as Figure 6 As shown, multiple distribution curve segments 51 are distributed along the circumference of the center piece 3, and the same first radial rib 1 simultaneously intersects with two distribution curve segments 51. In the embodiment shown in the figure, the multiple distribution curve segments 51 are evenly distributed along the circumference of the center piece 3, and the same first radial rib 1 simultaneously intersects with two distribution curve segments 51, forming two notches in the first radial rib. When the multiple distribution curve segments 51 are evenly distributed along the circumference of the center piece 3, the two notches can be respectively close to the inner and outer sides of the air outlet grille in the radial direction, thereby improving the vortex destruction effect on the outlet airflow.

[0042] In some embodiments, the number of the plurality of distribution curve segments 51 is the same as the number of blades of the axial flow fan using the air outlet grille. Figure 6 The number of distribution curve segments 51 shown is 3, so the number of blades of the axial flow fan using the air outlet grille is also 3. One blade of the axial flow fan generates an outlet air flow with a spiral flow. The number of blades of the axial flow fan is the same as the number of distribution curve segments. The number of strands generated by the axial flow fan is the same as the number of distribution curve segments. The notches distributed along the distribution curve segments of the air outlet grille can better match the flow energy of the outlet air flow, further improving the effect of increasing the air volume and reducing noise of the outlet air flow.

[0043] In some embodiments, the number of the plurality of distribution curve segments 51 is 3. Since a conventional axial flow fan has 3 blades, the air outlet grille of this embodiment is more suitable for applications in conventional axial flow fans.

[0044] In some embodiments, the distribution curve segment 51 is a spiral segment. Since the flow of the outlet airflow generated by the axial flow fan is approximately spiral, the distribution curve segment 51 is a spiral segment. The gaps distributed along the distribution curve segment of the air outlet grille can better match the flow of the outlet airflow, further improving the effect of increasing the air volume and reducing noise of the outlet airflow.

[0045] In some embodiments, along the extension path of the first radial rib 1 from the end closest to the centerpiece 3 to the end furthest from the centerpiece 3, the extension direction of the first radial rib 1 deviates toward the same deviating side relative to the radial direction outward from the centerpiece 3 toward the outer frame 2 of the air outlet grille, and the extension direction of multiple first radial ribs 1 deviates toward the same deviating side relative to the radial direction outward from the centerpiece 3 toward the outer frame 2 of the air outlet grille. The concept of deviating side in this embodiment is the same as the concept of deviating side in the description of the distribution curve segment in the above embodiment. In this embodiment, the extension direction of the extended section of the first radial rib 1 during extension deviates toward the deviating side relative to the radial direction in which it lies, thereby better matching the flow of the approximately spiral-shaped outlet airflow, reducing resistance to the outlet airflow, and increasing airflow output. In some embodiments, the deviating side of the first radial rib 1 is the same as the deviating side of the distribution curve segment. In some embodiments, the extension direction of the extended section of the first radial rib 1 during extension relative to the radial direction in which it lies is the same as the direction of rotation of the blades of the axial flow fan used.

[0046] In some embodiments, as Figure 1 、 Figure 2 and Figure 5As shown, the center piece 3 includes an annular inner frame 33, a center portion 31, and a plurality of second radial ribs 32 arranged around the center portion 31. In the embodiment shown in the figure, the annular inner frame 33 and the center portion 31 are both circular structures. The first radial rib 1 extends between the inner frame 33 and the outer frame 2, and the second radial rib 32 extends between the center portion 31 and the inner frame 33. Along the extension path from the end of the second radial rib 32 close to the center piece 3 to the end away from the center piece 3, the extension direction of the second radial rib 32 deviates from the radial direction of the air outlet grille from the center piece 3 to the outer frame 2 toward the same deviated side, and the deviated sides of the plurality of second radial ribs 32 are the same, and the deviated side of the second radial rib 32 is opposite to the deviated side of the first radial rib 1. When the axial flow fan is working, the outlet air flow mainly flows out of the air outlet grille between the inner frame 33 and the outer frame 2, and there is very little outlet air flow between the center part 31 and the inner frame 33. At this time, under the action of pressure, some supplementary air flow will flow in from between the center part 31 and the inner frame 33 in the direction opposite to the outlet direction to supplement the outlet air flow. The presence of the second radial ribs 32 can guide this part of the supplementary air flow, and the deviated side of the second radial rib 32 is opposite to the deviated side of the first radial rib 1. The second radial rib 3 can better match the flow direction of the supplementary air flow, reduce the flow resistance to the supplementary air flow, improve the supplementary effect, and further increase the air volume of the outlet air flow.

[0047] In some embodiments, as Figure 3 and Figure 4 As shown, along the radial direction of the air outlet grille from the center piece 3 to the outer frame 2, the annular rib 4 includes an outer surface 42 located radially outward and an inner surface 41 located radially inward opposite to the outer surface 42. The points on the edge line of the outer surface 42 and / or inner surface 41 of the annular rib 4 on the downstream side of the air outlet direction are located at different positions along the air outlet direction. When the air flow flows out of the air outlet grille, part of the air flow will flow along the outer surface 42 and inner surface 42 of the annular rib 4 and detach from the edge line and flow out of the annular rib 4. Figure 4 As shown, if the points on the edge line 421 of the outer surface on the downstream side along the air outlet direction are at different positions along the air outlet direction, then the air outlet airflows of various parts along the circumference of the center piece will separate from the edge line of the outer surface 42 at different positions, and the vibrations and noises of the air outlet airflows of various parts will be staggered in phase, and there will be a mutual cancellation effect, which will help reduce noise and avoid the superposition of vibrations and noises when the phases are the same. If the points on the edge line 411 of the inner surface on the downstream side along the air outlet direction are at different positions along the air outlet direction, then the air outlet airflows of various parts along the circumference of the center piece will separate from the edge line of the inner surface at different positions, and the vibrations and noises of the air outlet airflows of various parts will be staggered in phase, and there will be a mutual cancellation effect, which will help reduce noise and avoid the superposition of vibrations and noises when the phases are the same.

[0048] In some embodiments, the edge lines of the outer surface 42 and / or the inner surface 41 of the annular rib 4, along the downstream side of the airflow direction, include spiral segments that spiral around the airflow direction. Designing the edge lines as spiral segments can better match the flow shape of the axial flow fan's airflow, helping to reduce wind resistance and increase airflow.

[0049] In some embodiments, the edge line of the outer surface 42 and / or the inner surface 41 of the annular rib 4, along the downstream side of the air outlet direction, includes multiple spiral segments of the same shape. The number of these spiral segments is equal to the number of blades of the axial flow fan to which the air outlet grille is applied. If the number of blades of the axial flow fan is equal to the number of spiral segments, then the number of strands generated by the axial flow fan is equal to the number of spiral segments of the edge line. This allows the shape of the edge line of the annular rib to better match the flow of the outlet airflow, further reducing wind resistance.

[0050] In some embodiments, as Figure 3 As shown, the downstream end faces of multiple adjacent annular ribs 4 along the outlet direction are positioned at different locations along the circumference of the center piece 3. That is, the outlet edge lines between adjacent annular ribs are positioned at different locations along the outlet direction. Consequently, the outlet airflow departs from the outlet edge lines of the adjacent annular ribs at different locations. This causes the vibration and noise of the outlet airflow to be out of phase, creating a mutually canceling effect. This helps reduce noise and avoids the superposition of vibration and noise that would occur if the phases were the same.

[0051] In some embodiments, an axial flow fan is also disclosed, comprising blades and any of the above-mentioned air outlet grilles. The axial flow fan using the above-mentioned air outlet grilles also has similar effects of increasing air volume and reducing noise.

[0052] In some embodiments, an air conditioner outdoor unit is also disclosed, comprising any of the above-mentioned air outlet grilles. The air conditioner outdoor unit using the above-mentioned air outlet grilles also has similar effects of increasing air volume and reducing noise.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and not to limit it; although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solution of the utility model, they should all be included in the scope of the technical solution for protection of the utility model.

Claims

1. An air outlet grille, characterized in that: include: Centerpiece (3); An annular outer frame (2) surrounding the center piece (3); A plurality of first radial ribs (1) are spaced apart along the circumference of the center piece (3) and extend between the center piece (3) and the outer frame (2), the first radial rib (1) comprising a notch (11) provided on an end surface on a downstream side of the first radial rib (1) along an air outlet direction, the notch (11) being concave toward the upstream along the air outlet direction; A plurality of annular ribs (4) are connected to the plurality of first radial ribs (1) and are arranged around the center piece (3) and between the center piece (3) and the outer frame (2).

2. The air outlet grille according to claim 1, wherein: The notches (11) of the plurality of first radial ribs (1) are distributed along a plurality of distribution curve segments intersecting the first radial ribs (1), and the notches (11) are provided at the intersections of the distribution curve segments and the first radial ribs (1); the distribution curve segments gradually move away from the center piece (3) from a starting point to an end point, and along an extension path from the starting point to the end point of the distribution curve segments, the extension direction of the distribution curve segments deviates toward the same deviation side relative to the radial direction of the air outlet grille from the center piece (3) to the outer frame (2) toward the outside, and the deviation sides of the plurality of distribution curve segments are all the same.

3. The air outlet grille according to claim 2, wherein: The multiple distribution curve segments are distributed along the circumference of the center piece (3), and the same first radial rib (1) intersects with two of the distribution curve segments at the same time.

4. The air outlet grille according to claim 2, wherein: The number of the plurality of distribution curve segments is the same as the number of blades of the axial flow fan to which the air outlet grille is applied.

5. The air outlet grille according to claim 2, wherein: The number of the plurality of distribution curve segments is 3.

6. The air outlet grille according to any one of claims 2 to 5, characterized in that: The distribution curve segment is a spiral segment.

7. The air outlet grille according to any one of claims 1 to 5, characterized in that: Along the extension path from the end of the first radial rib (1) close to the center piece (3) to the end away from the center piece (3), the extension direction of the first radial rib (1) deviates toward the same deviation side relative to the radial direction of the air outlet grille from the center piece (3) to the outer frame (2) toward the outside, and the deviation sides of the multiple first radial ribs (1) are all the same.

8. The air outlet grille according to claim 7, wherein: The center piece (3) comprises an annular inner frame (33), a center portion (31) and a plurality of second radial ribs (32) arranged around the center portion (31), wherein the first radial rib (1) extends between the inner frame (33) and the outer frame (2), and the second radial rib (32) extends between the center portion (31) and the inner frame (33), along an extension path from an end portion of the second radial rib (32) close to the center piece (3) to an end portion away from the center piece (3), the extension direction of the second radial rib (32) deviates toward the same deviated side relative to the radial direction of the air outlet grille from the center piece (3) to the outer frame (2), and the deviated sides of the plurality of second radial ribs (32) are the same, and the deviated side of the second radial rib (32) is opposite to the deviated side of the first radial rib (1).

9. The air outlet grille according to any one of claims 1 to 5, characterized in that: Along the radial direction of the air outlet grille pointing from the center piece (3) to the outer frame (2) toward the outside, the annular rib (4) includes an outer surface (42) located on the radial outside thereof and an inner surface (41) located on the radial inside thereof opposite to the outer surface (42), and points on the edge line on the downstream side along the air outlet direction of the outer surface (42) and / or the inner surface (41) of the annular rib (4) are located at different positions along the air outlet direction.

10. The air outlet grille according to claim 9, wherein: The edge line of the outer surface (42) and / or the inner surface (41) of the annular rib (4) on the downstream side along the air outlet direction includes a spiral line segment spiraling around the air outlet direction.

11. The air outlet grille according to claim 10, wherein: The edge line of the outer surface (42) and / or the inner surface (41) of the annular rib (4) on the downstream side along the air outlet direction includes a plurality of spiral line segments of the same shape, and the number of the plurality of spiral line segments of the same shape is the same as the number of blades of the axial flow fan using the air outlet grille.

12. The air outlet grille according to claim 9, wherein: The positions of the end surfaces of the downstream sides of the plurality of adjacent annular ribs (4) along the air outlet direction are all different in the circumferential direction of the center piece (3).

13. An axial flow fan, characterized in that: It comprises blades and an air outlet grille as claimed in any one of claims 1 to 12.

14. An air conditioner outdoor unit, characterized in that: It comprises the air outlet grille as described in any one of claims 1 to 12.

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