CN220489390U - Grille and air conditioner - Google Patents

Abstract

The utility model discloses a grid and air conditioner specifically, the grid includes inside casing, frame and a plurality of radial rib, and the outside of frame around at the inside casing, a plurality of radial ribs are established respectively between inside casing and frame, and a plurality of radial rib interval arrangement in the circumference of frame, on first projection face, first radial rib projected width is from inside to outside increase constantly afterwards gradually, first projection face perpendicular to the axis of frame. The grille can reduce the loss of air output and noise.

Description

Grille and air conditioner

Technical Field

The disclosure belongs to the technical field of air conditioners, and particularly relates to a grille and an air conditioner.

Background

The fan of off-premises station internally mounted is axial fan generally, and axial fan rotates at a high speed, can produce the air current that has centrifugal effect, and the air current is finally blown out the off-premises station through air-out grid, nevertheless still can exist centripetal rotation angle when the air current passes through air-out grid, and the air current that has centripetal rotation angle like this can receive the resistance of the wind-guiding face of annular rib and curve owner muscle when passing through air-out grid, and then causes the energy consumption of air loss and axial fan to increase, and the air current is collided with the wind-guiding face of annular rib and curve owner muscle and can be produced the noise, corresponding noise that makes the off-premises station increases.

Disclosure of Invention

The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art. For this reason, embodiments of the present disclosure propose a grille that can reduce loss of the air output and noise.

The embodiment of the disclosure also provides an air conditioner.

A grille of an embodiment of the present disclosure includes: an inner frame and an outer frame, wherein the outer frame surrounds the outer part of the inner frame; the first radial ribs are respectively arranged between the inner frame and the outer frame, the first radial ribs are arranged at intervals in the circumferential direction of the outer frame, the width of the projection of the first radial ribs is gradually increased from inside to outside and then is constant, and the first projection surface is perpendicular to the axis of the outer frame.

The grille of the embodiment of the disclosure can reduce the loss of air output and noise.

In some embodiments, the first radial rib includes a first segment and a second segment, the first segment is located inside the second segment, on the first projection surface, the width of the projection of the first segment gradually increases from inside to outside, and the width of the projection of the second segment is constant.

In some embodiments, the ratio of the dimension of the first section in the outer frame radial direction to the dimension of the entire first radial rib in the outer frame radial direction is 50% to 70%, and the ratio of the dimension of the second section in the outer frame radial direction to the dimension of the entire first radial rib in the outer frame radial direction is 30% to 50%.

In some embodiments, the cross-sectional dimension of the first radial rib increases gradually in the axial direction of the outer frame in a direction away from the axial flow fan.

In some embodiments, the outer wall surface of the first radial rib is a rounded surface.

In some embodiments, on the cross section of the first radial rib, concave surfaces and convex surfaces are oppositely arranged on the first radial rib in the width direction, and a first preset included angle a is formed between a connecting line between two side vertexes of the concave surface in the height direction of the first radial rib and the first projection surface.

In some embodiments, the first preset angle a is gradually reduced from inside to outside in the first annular region, and the first preset angle a is constant in the second annular region.

In some embodiments, a second preset included angle B is formed between a tangent line tangent to the first radial rib and a tangent line tangent to the outer wall surface of the outer frame at the joint of the first radial rib and the outer frame, and the included angle B is 40 degrees less than or equal to 60 degrees.

In some embodiments, the grid further comprises an inner ring and second radial ribs, the inner ring being located inside the inner frame, and the second radial ribs being located between the inner ring and the inner frame, and the first radial ribs being opposite in direction of rotation to the second radial ribs.

In some embodiments, the grid further comprises first and second reinforcing bars, the first reinforcing bar being disposed between the inner and outer frames, the second reinforcing bar being disposed between the inner and inner frames.

In some embodiments, the first and/or second reinforcing ribs extend spirally or vertically along a radial direction of the outer frame.

The air conditioner of the embodiment of the disclosure comprises: a housing and a grille as in any one of the above embodiments, the grille being associated with the air conditioner.

Drawings

FIG. 1 is a schematic structural view of a grid of an embodiment of the present disclosure, and including an inner race and second radial ribs.

FIG. 2 is a schematic structural view of a grid of an embodiment of the present disclosure, and does not include an inner race and second radial ribs.

Fig. 3 is a schematic cross-sectional view of a first radial rib of an embodiment of the present disclosure.

Fig. 4 is a schematic view of a projection of a grid of an embodiment of the present disclosure onto a first projection surface.

Fig. 5 is a schematic installation view of a first radial rib of an embodiment of the present disclosure.

Fig. 6 is a flow and loss comparison schematic of a grating according to an embodiment of the present disclosure and a grating in the related art.

Fig. 7 is a schematic structural view of a grill according to another embodiment of the present disclosure.

Fig. 8 is a schematic structural view of a grill according to another embodiment of the present disclosure.

Fig. 9 is a schematic structural view of a grill according to another embodiment of the present disclosure.

Reference numerals:

the inner frame 1, the outer frame 2, the first radial ribs 3, the concave surface 31, the convex surface 32, the first section 33, the second section 34, the first annular region 4, the second annular region 5, the inner ring 6, the second radial ribs 7, the first reinforcing ribs 8 and the second reinforcing ribs 9.

Detailed Description

Embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, are described in detail below. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present disclosure and are not to be construed as limiting the present disclosure.

As shown in fig. 1 to 9, a grille of an embodiment of the present disclosure includes: the inner frame 1, the frame 2 and a plurality of first radial ribs 3, the frame 2 encircles the outside at the inner frame 1, a plurality of first radial ribs 3 are established respectively between the inner frame 1 and the frame 2, and a plurality of first radial ribs 3 are arranged at the circumference of frame 2 at intervals, on first projection face, the width of projection of first radial ribs 3 is from inside to outside increase constantly afterwards, and first projection face is perpendicular to the axis of frame 2.

Specifically, as shown in fig. 1 and 2, the inner frame 1 and the outer frame 2 are concentrically arranged, and the inner frame 1 and the outer frame 2 are both annular, the first radial ribs 3 extend along the radial direction of the outer frame 2, the first radial ribs 3 extend in a spiral line shape, and the plurality of first radial ribs 3 are uniformly arranged at intervals in the axial direction of the outer frame 2.

It should be noted that, the first radial ribs 3, the inner frame 1 and the outer frame 2 may be integrally injection molded, so as to improve the structural strength of the first radial ribs 3.

According to the grid disclosed by the embodiment of the disclosure, the width of the outer contour of the first radial ribs 3 on the first projection surface is gradually increased from inside to outside and then is constant, so that the flow resistance of the first radial ribs 3 can be reduced, the loss of air output is reduced, noise is reduced, and the air output of a fan is improved compared with a fan in the related art in unit time due to the reduction of the air output loss, so that the energy consumption of the fan can be reduced, and the energy-saving effect is achieved.

In some embodiments, the first radial rib 3 includes a first segment 33 and a second segment 34, the first segment 33 is located inside the second segment 34, and on the first projection plane, the width of the projection of the first segment 33 gradually increases from inside to outside, and the width of the projection of the second segment 34 is constant.

Specifically, as shown in fig. 4, the inner side of the first section 33 is connected to the inner frame 1, the outer side of the first section 33 is connected to the second section 34, and the outer side of the second section 34 is connected to the outer frame 2, for example, the first section 33 and the second section 34 are integrally formed. The projection width of the first section 33 gradually increases from inside to outside, and the projection width of the second section 34 is constant from inside to outside.

It should be noted that, the deflection angles of the first radial ribs 3 in the radial direction of the outer frame 2 are different, so that the projection width of the first section shows a variation trend, and if the deflection angles of the first radial ribs 3 are the same, the projection width shows a constant trend. The first radial ribs 3 have different deflection angles at different radial positions, match the air flow state of the impeller outlet, and are matched with the radial arrangement mode of the spiral line of the first radial ribs 3 in a spiral line shape, so that the radial distribution of the air flow of the fan is favorably regulated, the rectifying capacity is higher, and the flow resistance of a grid area is favorably reduced.

In some embodiments, the ratio of the dimension of the first section 33 in the radial direction of the outer frame 2 to the dimension of the entire first radial rib 3 in the radial direction of the outer frame is 50% to 70%, and the ratio of the dimension of the second section 34 in the radial direction of the outer frame 2 to the dimension of the entire first radial rib 3 in the radial direction of the outer frame 2 is 30% to 50%.

It should be noted that, when the circumferential position of the inner frame 1 is defined as 0% and the circumferential position of the outer frame 2 is defined as 100%, and the radial length between the inner frame 1 and the outer frame 2 is the same as the length of the first radial rib 3, the first section 33 extends from the inner frame 1 to the outer frame 2 by 0% to 50% to 70%, and the second section 34 extends from the inner frame 1 to the outer frame 2 by 30% to 50% to 100%, in other words, the sum of the dimensions of the first section 33 and the second section 34 is equal to the length of the entire first radial rib 3.

In some embodiments, on the first projection surface, the space surrounded by the inner frame 1 and the outer frame 2 is divided into a first annular area 4 and a second annular area 5 along the radial direction of the outer frame 2, the second annular area 5 is located outside the first annular area 4, the projected width of the first radial ribs 3 is gradually increased from inside to outside in the first annular area 4, and the projected width of the first radial ribs 3 is constant in the second annular area 5.

Specifically, as shown in fig. 4, the first projection plane is a projection plane orthogonal to the axis of the outer frame 2, in other words, the first projection plane is a front projection plane, the outer frame 2 and the inner frame 1 are both circular rings on the first projection plane, the area surrounded by the outer frame 2 and the inner frame 1 is divided into a first annular area 4 and a second annular area 5 in the radial direction, the second annular area 5 surrounds the outside of the first annular area 4, the projection of the first radial ribs 3 on the first projection plane is a spiral line with a width, the projection width of the first radial ribs 3 on the first projection plane is gradually increased from inside to outside in the first annular area 4, and the projection width of the first radial ribs 3 on the first projection plane is constant in the second annular area 5.

It should be noted that, since the deflection angles of the first radial ribs 3 in the radial direction of the outer frame 2 are different, the projection width in the first annular region 4 shows a trend of variation, and the projection width in the second annular region 5 shows a trend of constant. Different areas of the first radial ribs 3 have different deflection angles, the air flow state of the impeller outlet is matched, and the radial arrangement mode of the spiral lines of the first radial ribs 3 is matched, so that radial distribution of the air flow of the fan is adjusted, the rectifying capability is high, and the flow resistance of the grid area is reduced.

In some embodiments, on the first projection surface, the ratio of the projection area of the first annular region 4 to the projection area of the space enclosed by the outer frame 2 and the inner frame 1 is 50% to 70%, and the ratio of the projection of the second annular region 5 to the projection area of the outer shell is 30% to 50%.

It should be noted that, when the circumferential position of the inner frame 1 is defined as 0%, the circumferential position of the outer frame 2 is defined as 100%, and the space enclosed by the inner frame 1 and the outer frame 2 is 0% to 100%, the first annular region 4 is 0% to 50% to 70%, and the second annular region 5 is 30% to 50% to 100%, in other words, the sum of the areas of the first annular region 4 and the second annular region 5 may completely cover the space enclosed by the inner frame 1 and the outer frame 2, and the duty ratios of the two are complementary.

For example, the projection area of the first annular region 4 occupies 50%, 55%, 60% or 70% of the projection area of the space surrounded by the outer frame 2 and the inner frame 1, the projection area of the second annular region 5 occupies 30%, 40%, 45% or 50% of the projection area of the space surrounded by the outer frame 2 and the inner frame 1, and it should be noted that when the projection area of the first annular region 4 occupies 60% of the projection area of the space surrounded by the outer frame 2 and the inner frame 1, the length of the projection width of the first radial rib 3 gradually increases occupies 60% of the length of the entire first radial rib 3, and the length of the projection width of the first radial rib 3 constantly maintains 40% of the entire first radial rib 3.

According to the grid disclosed by the embodiment of the disclosure, different areas of the first radial ribs 3 have different deflection angles, the air flow state of the impeller outlet is matched, the radial arrangement mode of the spiral lines of the first radial ribs 3 is matched, radial distribution of fan air flow is adjusted, the rectifying capacity is high, and the flow resistance of the grid area is reduced.

In some embodiments, the cross-sectional dimension of the first radial rib 3 increases gradually in the axial direction of the outer frame 2 in a direction away from the axial flow fan.

As shown in fig. 3, the width of the cross section of the first radial rib 3 gradually increases along the direction away from the fan in the axial direction of the outer frame 2, in other words, the width of the side, adjacent to the fan, of the first radial rib 3 is smaller than the width of the side, away from the fan, of the first radial rib 3, so that the shape of the first radial rib 3 is better matched with the airflow, the impact of the airflow on the first radial rib 3 is correspondingly reduced, and the airflow resistance and the aerodynamic noise of the grille are reduced.

In some embodiments, the outer wall surface of the first radial rib 3 is a rounded surface.

Specifically, as shown in fig. 3, the periphery of the first radial rib 3 is rounded, for example, a side of the first radial rib 3 close to the fan is rounded with a radius of 0.4mm, and a side of the first radial rib 3 far from the fan is rounded with a radius of 0.8 mm. The outer wall surface of the first radial rib 3 is set to be a smooth curved surface, so that the air resistance of the edge of the first radial rib 3 to the air flow can be reduced, and the flow of the fan is improved.

In some embodiments, in the cross section of the first radial rib 3, the first radial rib 3 is relatively provided with a concave surface 31 and a convex surface 32 in the width direction, and a first preset included angle a is formed between a connecting line between two side vertexes of the concave surface 31 in the height direction of the first radial rib 3 and the first projection surface.

Specifically, as shown in fig. 3, the left end face of the first radial rib 3 is a concave face 31, the right end face of the first radial rib 3 is a convex face 32, and an included angle between a connecting line between the upper end and the lower end of the concave face 31 and the first projection plane is a first preset included angle. In other words, the first radial ribs 3 have a deflection angle relative to the first projection plane, and since a first preset included angle is formed between the first radial ribs 3 and the first projection plane, the first radial ribs 3 are more matched with the outlet airflow state, and are matched with the arrangement mode of the first radial ribs 3 in spiral radiation, so that the radial distribution of the fan airflow is favorably regulated, the rectifying capability is higher, and the flow resistance of the grid area is favorably reduced.

In some embodiments, the first preset angle a gradually decreases from inside to outside in the first annular region 4, and is constant in the second annular region 5.

It should be noted that, in the first annular region 4, the first preset included angle a gradually decreases from inside to outside, and as the value of the first preset included angle a gradually decreases, the projection width of the first radial rib 3 gradually increases in response to the first projection surface. In the second annular region 5, the first preset included angle a is constant, and as the value of the first preset included angle a is constant, the projection width of the first radial rib 3 is constant and reacts on the first projection surface.

For example, the variation value of the first preset included angle a may be set according to the parameters shown in table 1.

Table 1 first preset included angle distribution rule of this embodiment

Radial position 0%20%40%60%80%100%

The first preset included angle is 86 degrees 83 degrees 80 degrees 77 degrees

Compared with the grid provided by the embodiment of the disclosure, the offset angle of the radial ribs in the related art is constant, the offset angle of the first radial ribs 3 in the disclosure gradually decreases from inside to outside in the first annular region 4, and the offset angle of the first radial ribs in the second annular region 5 is constant, so that the grid is more matched with the airflow state of the impeller outlet, and is beneficial to adjusting the radial distribution of the airflow of the fan in a radiation arrangement mode of the spiral wire-shaped outer ring spoke spiral wire, has stronger rectifying capability and is also beneficial to reducing the flow resistance of the grid region.

In some embodiments, a second preset included angle B is formed between a tangent line tangent to the first radial ribs 3 and a tangent line tangent to the outer wall surface of the outer frame 2 at the connection position of the first radial ribs 3 and the outer frame 2, and the included angle B is 40 degrees less than or equal to 60 degrees.

Specifically, as shown in fig. 2, the outermost side of the first radial rib 3 is connected to the outer frame 2, and at the connection position of the first radial rib 3 and the outer frame 2, an included angle between a tangent line tangent to the first radial rib 3 and a tangent line tangent to the outer frame 2 is a second preset included angle B, and B may be 40 °, 50 °, 55 ° or 60 °.

It should be noted that, the magnitude of the second preset included angle B has an influence on the drag reduction performance of the grille, the front-back pressure drop of the grille is larger when the angle is too large, the corresponding impact loss is higher, and the thickness of the grille is reduced when the angle is too small, so that the air outlet performance of the fan is affected. And the second preset included angle is related to the rotating speed of the fan impeller, when the rotating speed of the fan impeller is between 800 and 900rpm, the second preset included angle is 50 degrees, the fan impeller is installed according to a spiral line, the flow resistance is reduced, and the air quantity is improved.

In some embodiments, the grid further comprises an inner ring 6 and second radial ribs 7, the inner ring 6 being located inside the inner casing 1, and the second radial ribs 7 being located between the inner ring 6 and the inner casing 1, and the first radial ribs 3 being opposite to the direction of rotation of the second radial ribs 7.

Specifically, as shown in fig. 1, the inner ring 6 is located inside the inner frame 1, and the inner ring 6 and the inner frame 1 are concentrically arranged, and the second radial ribs 7 are provided between the inner ring 6 and the inner frame 1, for example, the second radial ribs 7 are integrally formed with the inner ring 6, thereby improving the structural strength of the second radial ribs 7. The rotation direction of the first radial ribs 3 is opposite to the selection direction of the second radial ribs 7, for example, when the first radial ribs 3 rotate clockwise to extend, the second radial ribs 7 rotate anticlockwise to extend, the grid disturbs the flow field of the axial fan blade air outlet, anticlockwise vortex air flow can be generated in the central area (namely the area between the inner ring 6 and the inner frame 1) of the grid, clockwise vortex air flow is generated in the peripheral area (namely the area between the inner frame 1 and the outer frame 2), the two reverse vortex air flows are mixed and dissipated, the air backflow in the central area and the vortex intensity in the peripheral area are reduced, the aerodynamic resistance is reduced, the aerodynamic noise is reduced, the blowing area is enlarged, and the air output is increased.

In some embodiments, the grid further comprises first stiffening ribs 8 and second stiffening ribs 9, the first stiffening ribs 8 being provided between the inner frame 1 and the outer frame 2, the second stiffening ribs 9 being provided between the inner ring 6 and the inner frame 1.

Specifically, as shown in fig. 1, the number of the first reinforcing ribs 8 is plural, the plural first reinforcing ribs 8 are arranged at intervals in the radial direction of the outer frame 2, the first reinforcing ribs 8 may be annular, and the plural first reinforcing ribs 8 are arranged concentrically around. The number of the second reinforcing ribs 9 is plural, the plural second reinforcing ribs 9 are arranged at intervals in the radial direction of the outer frame 2, the second reinforcing ribs 9 may be annular, and the plural second reinforcing ribs 9 are arranged concentrically around. By providing the first reinforcing ribs 8 and the second reinforcing ribs 9, the structural strength of the first radial ribs 3 and the second radial ribs 7 can be improved.

In some embodiments, the first reinforcing bars 8 and/or the second reinforcing bars 9 extend spirally or vertically in the radial direction of the outer frame 2.

Specifically, as shown in fig. 7 to 9, for example, the first reinforcing ribs 8 are spirally extended in the radial direction of the outer frame 2, the plurality of first reinforcing ribs 8 are all connected to the inner frame 1, and the rotation direction of the first reinforcing ribs 8 is opposite to the rotation direction of the first radial ribs 3, or the first reinforcing ribs 8 are spirally extended in the radial direction of the outer frame 2, part of the plurality of first reinforcing ribs 8 are connected to the inner frame 1, the remaining first reinforcing ribs 8 are connected only to the outer frame 2, and the rotation direction of the first reinforcing ribs 8 is opposite to the rotation direction of the first radial ribs 3.

Or, the second reinforcing ribs 9 spirally extend along the radial direction of the outer frame 2, the plurality of second reinforcing ribs 9 are connected with the inner frame 1, and the rotation direction of the second reinforcing ribs 9 is opposite to the rotation direction of the second radial ribs 7, or, the second reinforcing ribs 9 spirally extend along the radial direction of the outer frame 2, part of the second reinforcing ribs 9 in the plurality of second reinforcing ribs 9 are connected with the inner frame 1, the rest of the second reinforcing ribs 9 are connected with the outer frame 2 only, and the rotation direction of the second reinforcing ribs 9 is opposite to the rotation direction of the second radial ribs 7.

Alternatively, the first reinforcing ribs 8 vertically extend in the radial direction of the outer frame 2, or the second reinforcing ribs 9 vertically extend in the radial direction of the outer frame 2, or both the first reinforcing ribs 8 and the second reinforcing ribs 9 vertically extend in the radial direction of the outer frame 2.

The grating according to the embodiment of the present disclosure and the grating performance comparing effect in the related art are described below with reference to fig. 1 to 6.

As shown in fig. 6, compared with a grid which is in an arc spoke arrangement mode with the same size and does not regularly change and adjust the first preset included angle a, the flow rate of the calculated result is improved by about 300m3/h, and the pressure drop of the front and rear sides of the grid is reduced by 10Pa. In the present disclosure, by dividing the first annular region 4 and the second annular region 5, and the first preset included angle a changes differently in the first annular region 4 and the second annular region 5, under the condition of the same density, compared with the grids in the related art, the pressure drop of the grids of the present disclosure is almost the same at the front and rear sides of the fan, but the air volume is improved by 20m3/h.

The air conditioner of the embodiment of the disclosure comprises: the housing and grille of any of the above embodiments, the grille being associated with an air conditioner.

In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present disclosure.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless explicitly specified otherwise.

In the present disclosure, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art as the case may be.

In this disclosure, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In this disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Although embodiments of the present disclosure have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the present disclosure.

Claims (12)

1. A grille, comprising:

an inner frame and an outer frame, wherein the outer frame surrounds the outer part of the inner frame;

the first radial ribs are respectively arranged between the inner frame and the outer frame, the first radial ribs are arranged at intervals in the circumferential direction of the outer frame, the width of the projection of the first radial ribs is gradually increased from inside to outside and then is constant, and the first projection surface is perpendicular to the axis of the outer frame.

2. The grid of claim 1, wherein the first radial rib comprises a first segment and a second segment, the first segment is located inside the second segment, the width of the first segment projected on the first projection surface gradually increases from inside to outside, and the width of the second segment projected is constant.

3. The grid of claim 2, wherein the ratio of the dimension of the first section in the outer frame radial direction to the dimension of the entire first radial rib in the outer frame radial direction is 50% to 70%, and the ratio of the dimension of the second section in the outer frame radial direction to the dimension of the entire first radial rib in the outer frame radial direction is 30% to 50%.

4. The grid of claim 2, wherein the first radial ribs increase in cross-sectional dimension in an axial direction of the outer frame in a direction away from the axial flow fan.

5. The grid according to claim 4, wherein the outer wall surface of the first radial rib is a rounded surface.

6. The grid according to claim 4, wherein, in the cross section of the first radial rib, concave surfaces and convex surfaces are arranged opposite to each other in the width direction of the first radial rib, and a first preset included angle a is formed between a connecting line between vertexes of two sides of the concave surface in the height direction of the first radial rib and the first projection surface.

7. The grid according to claim 6, wherein on the first projection surface, a space surrounded by the inner frame and the outer frame is divided into a first annular area and a second annular area along a radial direction of the outer frame, the second annular area is located outside the first annular area, the first preset included angle a is gradually reduced from inside to outside in the first annular area, and the first preset included angle a is constant in the second annular area.

8. Grid according to claim 1, characterized in that at the junction of the first radial ribs with the outer frame, a second preset angle B is provided between the tangent to the first radial ribs and the tangent to the outer wall surface of the outer frame, and B is equal to or greater than 40 ° and equal to or less than 60 °.

9. The grid of claim 1, further comprising an inner ring and second radial ribs, the inner ring being located inside the inner frame and the second radial ribs being located between the inner ring and the inner frame, and the first radial ribs being opposite in direction of rotation to the second radial ribs.

10. The grid of claim 9, further comprising first and second ribs, the first rib being disposed between the inner and outer frames and the second rib being disposed between the inner and inner frames.

11. The grid of claim 10, wherein the first and/or second ribs extend helically or vertically in a radial direction of the outer frame.

12. An air conditioner, comprising: a housing and a grille as claimed in any one of claims 1 to 1, the grille being associated with the air conditioner.