WO2024114768A1 - Air outlet grille and air conditioner outdoor unit - Google Patents

Abstract

The present invention relates to an air outlet grille and an air conditioner outdoor unit, belonging to the technical field of air conditioning equipment. The grille comprises a central part, an annular outer frame, at least one circumferential air guide rib and at least two radial air guide apparatuses. The circumferential air guide rib is annular in shape and located between the central part and the annular outer frame, so as to form at least two annular air outlet areas. Each radial air guide apparatus is disposed in an annular air outlet area, and each radial air guide device comprises multiple radial guide vanes arranged at intervals along a circumferential direction. The width of a windward face of a radial guide vane is smaller than the width of an air outlet face of the radial guide vane. The radial guide vanes are obliquely arranged. The outlet grille and the air conditioner outdoor unit have low resistance when air flow enters and high wind pressure and wind speed when air flow exits, and can guide a circumferential velocity of the air volume entering the annular air outlet area into an axial velocity, increase wind pressure and wind speed of output air, increase a distance of blown air flow, and reduce air flow backflow, so as to achieve the effects of improving heat exchange efficiency of the air conditioner outdoor unit and reducing energy consumption of an air conditioner.

Description

Air outlet grille and air conditioner outdoor unit Technical Field

The present invention relates to the technical field of air conditioning equipment, and in particular to an air outlet grille and an air conditioning outdoor unit.

Background technique

Air conditioner outdoor units usually have an air outlet grille on the outside of the axial flow fan, which serves as a safety protection function on the one hand, and guides the airflow discharged by the axial flow fan on the other hand. The air outlet grilles currently on the market, on the one hand, have a large resistance to the airflow discharged by the axial flow fan, reducing the flow rate of the airflow discharged by the axial flow fan, and on the other hand, due to structural limitations, the air supply angle of the airflow discharged by the axial flow fan is large. After the airflow is discharged from the air outlet grille, part of it is sucked back to the air conditioner outdoor unit, causing the return air phenomenon, which greatly affects the heat exchange efficiency of the air conditioner outdoor unit, and then makes the cooling or heating efficiency of the air conditioner low and the energy consumption high.

Summary of the invention

In view of the above problems, the present invention proposes an air outlet grille that at least partially solves the above problems, which can reduce the air outlet grille's resistance to the air flow discharged by the axial flow fan, reduce the return air phenomenon, and achieve the effect of improving the heat exchange efficiency of the air conditioner outdoor unit and reducing the energy consumption of the air conditioner.

Specifically, the present invention provides the following technical solutions:

An air outlet grille comprises a central portion, an annular outer frame, at least one circumferential air guide rib and at least two radial air guide devices. The circumferential air guide rib is annular and is located between the central portion and the annular outer frame to form at least two annular air outlet areas. Each of the radial air guide devices is arranged in one of the annular air outlet areas, and each of the radial air guide devices comprises a plurality of radial guide vanes arranged at intervals along the circumferential direction. The width of the windward surface of the radial guide vane is smaller than the width of the air outlet surface of the radial guide vane. The radial guide vane is arranged at an inclination so that the first side surface of the radial guide vane is inclined toward the air outlet side, and the second side surface of the radial guide vane is inclined toward the air inlet side.

Optionally, the radial guide vanes extend in a curved shape along the radial direction of the central portion, and the projection of the radial guide vanes in a reference plane perpendicular to the axis of the central portion is an arc, so that the radial guide vanes are arched. The radii of the arcs are all equal.

Optionally, in the cross section of the radial guide vane, the angle between the first side surface and the windward surface is 60° to 80°, and the angle between the second side surface and the windward surface is 50° to 70°.

Optionally, the radial cross-section of the circumferential wind guiding rib is rectangular in profile. The long side of the rectangle is parallel to the axis of the central portion. The long side of the rectangle is 6 mm to 10 mm long, and the short side is 2.5 mm to 3.5 mm long; the width of the wind outlet surface is 2.5 mm to 3.5 mm, and the width of the windward surface is 0.8 mm to 1.2 mm.

Optionally, the widths of the annular air outlet areas are all the same. The plurality of radial guide vanes of each radial air guide device are evenly spaced and arranged along the circumferential direction.

Optionally, the arching direction of the radial guide vanes of the radial air guiding device at the outermost side is opposite to the arching direction of the radial guide vanes of the radial air guiding device at the innermost side.

Optionally, the maximum vertical spacing between two adjacent radial guide vanes of the same radial air guide device is less than or equal to 15 mm. All the maximum vertical spacings are equal.

Optionally, the width of the annular air outlet area is less than or equal to 40 mm.

Optionally, when the total number of the radial air-guiding devices is an even number, the arching directions of the radial guide vanes of the half of the radial air-guiding devices close to the outer side are all the same; the arching directions of the radial guide vanes of the half of the radial air-guiding devices close to the inner side are all the same.

Optionally, the ratio of the radius of the circular arc to the radius of the outer edge of the annular outer frame is 1 to 2.

Optionally, the distance between the vertical center line of the chord of each arc and the axis of the central part is smaller than the distance between the midpoint of the chord of each arc and the axis of the central part, and the point on the vertical center line of the chord of each arc that is perpendicular to the axis of the central part is located on the inner side of each arc.

The present invention also provides an air conditioner outdoor unit, comprising an axial flow fan and any one of the above-mentioned air outlet grilles;

The air outlet grilles are arranged at intervals on the air outlet side of the axial flow fan, and the axis of the central portion is collinear with the rotating shaft of the axial flow fan;

The inclination direction of the radial guide vanes of the radial air guiding device is the same as the rotation direction of the axial flow fan.

Optionally, the arching direction of the radial guide vanes of the radial air guiding device located at the outermost side is opposite to the rotation direction of the axial flow fan.

The present application provides an air outlet grille and an air conditioner outdoor unit, which are provided with at least one circumferential air guide rib, forming the air outlet grille into at least two annular air outlet areas, each of which is provided with a plurality of radial guide vanes arranged at intervals along the circumferential direction, and the width of the windward surface of each radial guide vane is smaller than the width of the air outlet surface, so that the resistance of the inlet and outlet airflow when entering the annular air outlet area is small, and the wind pressure when flowing out of the radial guide vane is large, and the wind Each radial guide vane is tilted, with the first side of the radial guide vane tilted toward the air outlet side and the second side tilted toward the air inlet side, which can guide the circumferential velocity of the air entering the annular air outlet area into an axial velocity, further increasing the wind pressure and wind speed of the air outlet, increasing the distance of the blown air flow, and reducing the air flow backflow, thereby improving the heat exchange efficiency of the air conditioner outdoor unit and reducing the energy consumption of the air conditioner.

Furthermore, in the air outlet grille and air conditioner outdoor unit provided by the present application, the radial guide vanes are arc-shaped and extend radially, and the curvature radius of the arc surface of all radial guide vanes is equal, so that the radial guide vanes have better aerodynamic performance, effectively collect the rotating airflow on the air inlet side, improve the static pressure efficiency of the axial flow fan, and reduce kinetic energy loss. The wind pressure and wind speed of the air outlet can be increased, the distance of the blown airflow is increased, and the airflow backflow is reduced.

Furthermore, in the air outlet grille and the air conditioner outdoor unit provided in the present application, the inclination direction of the radial guide vanes is the same as the rotation direction of the axial flow fan, so as to minimize the air outlet resistance.

Furthermore, the arching direction of the radial guide vanes of the outermost radial air guide device is opposite to the rotation direction of the axial flow fan, and the arching direction of the radial guide vanes of the outermost radial air guide device is opposite to the arching direction of the radial guide vanes of the innermost radial air guide device. The radial guide vanes on the outer side effectively collect the rotating airflow in the high wind area on the air inlet side, increase the static pressure, and the radial guide vanes on the inner side effectively reduce the resistance to the rotating airflow in the low wind area on the air inlet side, reduce the air volume loss, further increase the wind pressure and wind speed of the outlet air, increase the distance of the blown airflow, and reduce the airflow backflow.

Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG1 is a schematic structural diagram of an air outlet grille according to an embodiment of the present invention;

FIG2 is a schematic front view of an air outlet grille according to an embodiment of the present invention;

Fig. 3 is a schematic cross-sectional view along the A-A plane in Fig. 2;

Fig. 4 is a schematic cross-sectional view along the B-B plane in Fig. 2;

FIG5 is a schematic enlarged view of point C in FIG2 ;

6 is a schematic elevation view of a cross section of a radial guide vane according to one embodiment of the present invention;

7 is a schematic front view of a cross section of a circumferential wind guiding rib according to an embodiment of the present invention.

Detailed ways

The air outlet grille and the air conditioner outdoor unit of the embodiment of the present invention are described below with reference to Figures 1 to 7. In the description of this embodiment, it should be understood that the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and other features may be further included.

Unless otherwise clearly defined and limited, the terms "set", "install", "connect", "connect", "fix", "couple" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. A person skilled in the art should be able to understand the specific meanings of the above terms in the present invention according to the specific circumstances.

In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. That is, in the description of this embodiment, the first feature being "above", "above", and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below", or "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

In the description of the present embodiment, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

FIG1 is a schematic structural diagram of an air outlet grille according to an embodiment of the present invention. In combination with FIG2-7, the present invention provides an air outlet grille, including a central portion 1, an annular outer frame 2, at least one circumferential air guide rib 3 and at least two radial air guide devices. The circumferential air guide rib 3 is annular and is located between the central portion 1 and the annular outer frame 2. The outer frame 2 is provided between the radial guide vanes 4 and the outer frame 2 to form at least two annular air outlet areas. Each radial air guide device is arranged in an annular air outlet area, and each radial air guide device includes a plurality of radial guide vanes 4 arranged at intervals along the circumferential direction. The width of the windward surface 42 of the radial guide vane 4 is smaller than the width of the air outlet surface of the radial guide vane 4. The radial guide vane 4 is inclined so that the first side surface 41 of the radial guide vane 4 is inclined toward the air outlet side, and the second side surface 42 of the radial guide vane 4 is inclined toward the air inlet side.

The air outlet grilles are usually arranged at intervals on the air outlet side of the axial flow fan. The airflow blown out by the axial flow fan is a rotating airflow, and its wind speed includes axial speed, circumferential speed and radial speed. When the circumferential speed and radial speed are large, the axial speed of the airflow must be small, that is, the blowing distance is short, which is easy to cause airflow backflow.

In this embodiment, the central part 1, the circumferential wind guide ribs 3 and the two annular air outlet areas are all arranged to be concentric with the axis of the rotating shaft of the axial flow fan, the windward surface 42 of the radial guide vane 4 faces the axial flow fan and is perpendicular to the axis of the axial flow fan, and the windward surface of the radial guide vane 4 is arranged opposite to the windward surface 42. As shown in Figures 3-4 and 6, the width of the windward surface 42 of each radial guide vane 4 is smaller than the width of the windward surface, that is, the cross section of the air inlet is larger and the cross section of the air outlet is smaller, so that the resistance of the airflow on the inlet and outlet sides when entering the annular air outlet area is smaller, and the wind pressure and wind speed are larger when flowing out of the radial guide vane 4. As shown in Figures 4-5, each radial guide vane 4 is arranged obliquely, the first side surface 41 of the radial guide vane 4 is inclined toward the wind outlet side, and the second side surface 42 is inclined toward the wind inlet side, which can guide the circumferential velocity of the air volume entering the annular air outlet area into the axial velocity, further improve the wind pressure and wind speed of the wind outlet, increase the distance of the blown air flow, reduce the airflow backflow, and achieve the effect of improving the heat exchange efficiency of the air conditioner outdoor unit and reducing the energy consumption of the air conditioner.

In some embodiments of the air outlet grille of the present invention, as shown in FIG6 , the cross section of the radial guide vane 4 is trapezoidal, and in FIG6 , rounded corners are provided at the four corners of the trapezoid to improve the aerodynamic performance of the radial guide vane 4 and reduce the resistance to wind speed. In this embodiment, the width D1 of the windward surface 42 is 1 mm, and the width D2 of the wind outlet surface is 3 mm. Such a setting can minimize the resistance and increase the wind pressure of the wind while ensuring the structural strength of the radial guide vane 4, thereby achieving the effect of increasing the wind pressure and wind speed of the wind, increasing the distance of the blown air flow, and reducing the backflow of the air flow.

In some embodiments of the air outlet grille of the present invention, as shown in FIG. 2 , the radial guide vane 4 extends radially along the center portion 1 in a curved shape, and the projection of the radial guide vane 4 in a reference plane perpendicular to the axis of the center portion 1 is an arc. The radii of the arcs are all equal. In this embodiment, the radial guide vane 4 is set as the rear guide vane of the axial flow fan, so that the circumferential component velocity of the airflow passing through the radial guide vane 4 is converted into pressure energy, the outlet flow velocity direction is along the axial direction, the airflow delivery distance is farther, and the adverse effects caused by airflow backflow can be effectively avoided in a smaller space. The design of the radial guide vane 4 can reduce the loss of flow rotation kinetic energy, improve static pressure efficiency, and reduce Low aerodynamic noise and improved sound quality. According to the rear guide vane principle, the radial guide vane 4 formed by the arc surface with the same radius has the same aerodynamic performance and can replace the airfoil rear guide vane. The radial guide vane 4 formed by the arc surface with the same radius has a simple structure, is easier to design and manufacture, and has the same aerodynamic performance as the airfoil guide vane.

In some embodiments of the air outlet grille of the present invention, as shown in FIG6 , on the cross section of the radial guide vane 4, the angle between the first side surface 41 and the windward surface 42 is 60° to 80°. In this embodiment, the angle between the first side surface 41 and the windward surface 42 is the wind inlet angle α, and the wind inlet angle α is set between 60° and 80°, which can effectively convert the circumferential component velocity of the airflow generated by the axial flow fan into pressure energy. After being guided by the radial guide vane 4, the air outlet direction flows forward along the axial direction of the axial flow fan. A longer air supply distance is achieved, and airflow short circuit is effectively avoided.

In some embodiments of the air outlet grille of the present invention, the profile of the radial cross section of the circumferential air guiding rib 3 is a rectangle. The long side of the rectangle is parallel to the axis of the central portion 1. As shown in Figure 7, the circumferential air guiding rib 3 is used to fix the radial guide vane 4. In this embodiment, the cross section of the circumferential air guiding rib 3 is a rectangle, the width D3 of the rectangle is 3 mm, and the length D4 of the rectangle is 8 mm, which can minimize the resistance while ensuring the structural strength of the circumferential air guiding rib 3. The rectangular shape makes the front and back of the circumferential air guiding rib 3 smaller and the two side surfaces larger, that is, the windward surface 42 is smaller, which can reduce the impact on the axial component velocity of the airflow generated by the axial flow fan. The larger side surface can change the direction of the circumferential component velocity of the airflow generated by the axial flow fan, and has a certain rectifying effect on the airflow.

In some embodiments of the air outlet grille of the present invention, as shown in FIG2 , the widths of the annular air outlet areas are all the same. The multiple radial guide vanes 4 of each radial air guide device are evenly spaced along the circumferential direction. In this embodiment, as shown in FIG2 , the width of the annular air outlet area R2-R1=R3-R2=R4-R3, and the annular air outlet areas of the same width make the airflow passing through the annular air outlet area evenly arranged, which can improve the rectification effect. On the other hand, the multiple radial guide vanes 4 of each radial air guide device are evenly spaced along the circumferential direction, so that the airflow passing through the annular air outlet area is evenly arranged, further improving the rectification effect.

In some embodiments of the air outlet grille of the present invention, the width of the annular air outlet area is less than or equal to 40 mm. In this embodiment, as shown in FIG. 2 , the width of the annular air outlet area R2-R1=R3-R2=R4-R3 is less than or equal to 40 mm. This width is better than GB 4706.1 "Safety of Household and Similar Electrical Appliances Part 1: General Requirements", and can provide sufficient structural strength and protective gaps. At the same time, the resistance to the air outlet of the axial flow fan can be minimized to ensure that the airflow has sufficient wind speed to blow out of the air outlet grille, reducing airflow backflow.

In some embodiments of the air outlet grille of the present invention, two adjacent radial directions of the same radial air guide device The maximum vertical spacing between the guide vanes 4 is less than or equal to 15 mm. All maximum vertical spacings are equal. As shown in FIG5 , the maximum vertical spacing D5 between two adjacent radial guide vanes 4 of the same radial air guide device is less than or equal to 15 mm. Since the radial guide vanes 4 are arranged circumferentially in the radial direction, the maximum vertical spacing between two adjacent radial guide vanes 4 must be located near one end of the outer side. Limiting D5 to less than or equal to 15 mm can meet the relevant requirements of GB 4706.1 "Safety of Household and Similar Electrical Appliances Part 1: General Requirements" and provide sufficient structural strength and protective gaps. On the other hand, D5 of all radial guide vanes 4 is set to the maximum maximum vertical spacing within the limit range, that is, the farther away from the axis, the more radial guide vanes 4, and the closer to the axis, the fewer radial guide vanes 4, which can ensure that the gap between the radial guide vanes 4 is maximized, minimize the resistance to the airflow, and improve the exhaust efficiency.

In some embodiments of the air outlet grille of the present invention, as shown in Figures 2-4, the arching direction of the radial guide vanes of the outermost radial air guide device is opposite to the arching direction of the radial guide vanes of the innermost radial air guide device. The airflow corresponding to the outer radial guide vanes 4 is a high wind zone, where the circumferential velocity of the airflow is relatively large, and a reverse forward-inclined structure is adopted, that is, the arching direction of the radial guide vanes is opposite to the rotation direction of the axial flow fan, which can effectively collect the rotating airflow flowing through the impeller, convert the circumferential velocity into an axial velocity, and increase the static pressure. The airflow corresponding to the inner radial air guide is a low wind zone, and a forward-inclined structure is adopted, that is, the arching direction of the radial guide vanes is opposite to the rotation direction of the axial flow fan, so that the inner radial air guide reduces the resistance to the rotating airflow, reduces the axial wind loss, and avoids the generation of airflow backflow.

In some embodiments of the air outlet grille of the present invention, as shown in FIG2, when the total number of radial air guide devices is an even number, the arching directions of the radial guide vanes of the radial air guide devices close to the outside are all the same; the arching directions of the radial guide vanes of the radial air guide devices close to the inside are all the same. In this embodiment, the air outlet grille is provided with 4 annular air outlet areas, the arching directions of the radial guide vanes in the two inner annular air outlet areas are the same as the rotation direction of the axial flow fan, and the arching directions of the radial guide vanes in the two outer annular air outlet areas are opposite to the rotation direction of the axial flow fan. The airflow corresponding to the radial guide vanes 4 on the outside is a high wind area, where the circumferential velocity of the airflow is relatively large, and a reverse forward tilting structure is adopted, that is, the arching direction of the radial guide vanes is opposite to the rotation direction of the axial flow fan, which can effectively collect the rotating airflow flowing through the impeller, convert the circumferential velocity into the axial velocity, and increase the static pressure. The airflow corresponding to the inner radial air guide is in the low wind area, and adopts the same forward-inclined structure, that is, the arch direction of the radial guide vane is consistent with the rotation direction of the axial flow fan, so that the inner radial air guide reduces the resistance to the rotating airflow, reduces the axial wind loss, and avoids the generation of air flow backflow.

In some embodiments of the air outlet grille of the present invention, as shown in FIG. 2 , the radius of the arc is The ratio of the radius of the outer edge of the outer frame 2 is 1 to 2. In this embodiment, the radius R5 of the arc is 250 mm, and the radius of the outer edge of the annular outer frame 2 is 235 mm. The ratio of the radius of the arc to the radius of the outer edge of the annular outer frame 2 is 1 to 2, which can limit the maximum deflection of the radial guide vane 4, so that the radial guide vane 4 has better aerodynamic performance.

In some embodiments of the air outlet grille of the present invention, the distance between the vertical center line of the chord of each arc and the axis of the central part is less than the distance between the midpoint of the chord of each arc and the axis of the central part, and the point on the vertical center line of the chord of each arc that is perpendicular to the axis of the central part is located inside each arc. This arrangement can make the arching direction of the radial guide vane 4 deviate away from the direction of the central part, and the radial guide vane 4 can convert the circumferential velocity of the airflow generated by the axial flow fan into the axial velocity and static pressure with the maximum efficiency, so as to increase the air outlet velocity and air outlet distance.

In some embodiments of the air conditioner outdoor unit of the present invention, the air conditioner outdoor unit includes an axial flow fan and an air outlet grille. The air outlet grille is arranged at intervals on the air outlet side of the axial flow fan, and the axis of the central portion 1 is colinear with the rotating shaft of the axial flow fan. The inclination direction of the radial guide vane 4 of the radial air guide device is the same as the rotation direction of the axial flow fan, which can convert the circumferential velocity of the air flow blown out by the axial flow fan into an axial velocity, thereby increasing the static pressure, increasing the blowing distance, and reducing the air flow backflow.

In some embodiments of the air-conditioning outdoor unit of the present invention, the arch direction of the radial guide vanes of the outermost radial air-guiding device is opposite to the rotation direction of the axial flow fan, thereby reducing the air flow resistance of the air outlet grille to the air flow discharged by the axial flow fan, reducing the return air phenomenon, and achieving the effect of improving the heat exchange efficiency of the air-conditioning outdoor unit and reducing the energy consumption of the air conditioner.

At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims (10)

1. An air outlet grille, comprising:

   A central portion, an annular outer frame, and at least one annular circumferential wind guide rib located between the central portion and the annular outer frame to form at least two annular wind outlet areas;

   At least two radial air-guiding devices, each of which is arranged in one of the annular air outlet areas, and each of which includes a plurality of radial guide vanes arranged at intervals along the circumferential direction; the width of the windward surface of the radial guide vane is smaller than the width of the air outlet surface of the radial guide vane; the radial guide vane is inclined so that the first side surface of the radial guide vane is inclined toward the air outlet side, and the second side surface of the radial guide vane is inclined toward the air inlet side.
2. The air outlet grille according to claim 1, wherein:

   The radial guide vanes extend in a curved shape along the radial direction of the central portion;

   The projection of the radial guide vane in a reference plane perpendicular to the axis of the central portion is an arc, so that the radial guide vane is arched;

   The radii of the circular arcs are all equal.
3. The air outlet grille according to claim 1 or 2, wherein:

   The angle between the first side surface and the windward surface is 60° to 80°;

   The included angle between the second side surface and the windward surface is 50° to 70°.
4. The air outlet grille according to claim 1 or 2, wherein:

   The radial cross-section of the circumferential wind guiding ribs has a rectangular profile;

   The long sides of the rectangle are parallel to the axis of the central portion;

   The long side of the rectangle is 6 mm to 10 mm in length, and the short side is 2.5 mm to 3.5 mm in length;

   The width of the wind outlet surface is 2.5 mm to 3.5 mm, and the width of the windward surface is 0.8 mm to 1.2 mm.
5. The air outlet grille according to claim 1 or 2, wherein:

   The widths of the annular air outlet areas are all the same;

   The plurality of radial guide vanes of each radial air guide device are arranged evenly spaced along the circumferential direction;

   The maximum vertical spacing between two adjacent radial guide vanes of the same radial air guide device Less than or equal to 15mm;

   All said maximum vertical spacings are equal;

   The width of the annular air outlet area is less than or equal to 40 mm.
6. The air outlet grille according to claim 2, wherein:

   The arching direction of the radial guide vanes of the radial air guiding device located at the outermost side is opposite to the arching direction of the radial guide vanes of the radial air guiding device located at the innermost side.
7. The air outlet grille according to claim 6, wherein:

   When the total number of the radial air guiding devices is an even number,

   The radial guide vanes of the half of the radial air guide device close to the outer side have the same arching direction;

   The radial guide vanes of the half of the radial air guide device close to the inner side have the same arching direction.
8. The air outlet grille according to claim 2, wherein:

   The ratio of the radius of the circular arc to the radius of the outer edge of the annular outer frame is 1 to 2;

   The distance between a vertical centerline of the chord of each of the arcs and the axis of the central portion is smaller than the distance between a midpoint of the chord of each of the arcs and the axis of the central portion, and a point on the vertical centerline of the chord of each of the arcs that is perpendicular to the axis of the central portion is located inside each of the arcs, so that the arching direction of the radial guide vane is deflected away from the direction of the central portion.
9. An air conditioner outdoor unit, comprising an axial flow fan, wherein the air conditioner outdoor unit further comprises an air outlet grille as claimed in any one of claims 1 to 8;

   The air outlet grilles are arranged at intervals on the air outlet side of the axial flow fan, and the axis of the central portion is collinear with the rotating shaft of the axial flow fan;

   The inclination direction of the radial guide vanes of the radial air guiding device is the same as the rotation direction of the axial flow fan.
10. The air conditioner outdoor unit according to claim 9, wherein

    The arching direction of the radial guide vanes of the radial air guiding device located at the outermost side is opposite to the rotation direction of the axial flow fan.