Air outlet screen and air conditioner

Abstract

The application discloses an air outlet net cover and an air conditioner, and relates to the technical field of air conditioner design. The air outlet net cover comprises at least one air guide rib group surrounding a preset central axis, the air guide rib group comprises a plurality of air guide ribs arranged at intervals around the preset central axis, the air guide ribs extend in the radial direction of the air outlet net cover, the widths of the air guide ribs in the same air guide rib group are the same, wherein the width of the air guide rib is the size of the air guide rib in the air outlet direction of the air outlet net cover; each air guide rib comprises opposite windward side edges and air outlet side edges, and the windward side edges and the air outlet side edges are both wave-shaped edges. By changing the aerodynamic shape of the air guide rib, the windward side edges and the air outlet side edges are made to be wave-shaped, the airflow pulsation when the airflow passes through the air guide rib can be effectively reduced, and the aerodynamic noise level at the air outlet net cover is lowered.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and more specifically, to an air outlet grille and an air conditioner. Background Technology

[0002] Air conditioning noise sources mainly include aerodynamic noise, mechanical noise, and motor noise. Discrete noise and broadband noise caused by the rotation of the fan blades are considered to be the main sources of air conditioning noise. In addition to the shedding vortex noise induced by the rotation of the fan blades inside the air conditioner, the aerodynamic noise generated by the interference between the high-speed fluid and the mesh at the air conditioner outlet will be directly transmitted to the acoustic far field, which also has an important impact on the overall noise level of the air conditioner.

[0003] Air conditioner outlet grilles are typically designed as a grille configuration consisting of a radially multi-ringed array of air guide ribs. Under this design standard, the density of the outlet grille affects air resistance and noise. Existing data shows that, under the same voltage drive, a grille with sparse air guide ribs has a larger airflow than one with dense air guide ribs. At the same airflow, a grille with sparse air guide ribs has lower noise than one with dense air guide ribs. Increasing the density of the outlet grille is beneficial for increasing airflow and reducing noise. However, the design of air conditioner outlet grilles must meet strict safety standards, requiring that experimental fingers inserted into the outlet grille not touch the internal fan blades. Under this constraint, reducing noise by decreasing the distribution density of the air guide ribs presents certain difficulties. Therefore, existing outlet grilles are insufficient to improve the aerodynamic noise level of air conditioners. Utility Model Content

[0004] The problem addressed in this application is how to improve the aerodynamic noise level of an air conditioner while ensuring equipment safety.

[0005] To address the aforementioned problems, in a first aspect, this application provides an air outlet grille, comprising at least one group of air guide ribs surrounding a preset central axis. The air guide rib group includes multiple air guide ribs spaced apart around the preset central axis, extending radially in the air outlet grille. The air guide ribs within the same air guide rib group have the same width, wherein the width of the air guide rib is the dimension of the air guide rib in the air outlet direction of the air outlet grille. Each air guide rib includes opposing windward edge and air outlet edge, both of which are wavy edges.

[0006] Research and testing revealed that by altering the aerodynamic shape of the air guide ribs to make the windward and exhaust edges wavy, the airflow at different radial positions enters and exits the gaps between the air guide ribs at different times. This effectively reduces airflow pulsation when the airflow passes through the air guide ribs, thereby lowering the aerodynamic noise level at the exhaust grille.

[0007] In an optional implementation, the wavelengths of the windward and outlet edges of the air guide ribs gradually shorten from the inside to the outside along the radial direction of the air outlet grille. By setting this non-uniform wavelength distribution, the dynamic and static interference noise at different frequency bands caused by the velocity difference at different radial positions can be specifically improved, thereby enhancing the overall noise suppression capability of the air outlet grille.

[0008] In an optional embodiment, the air outlet shroud includes multiple groups of air guide ribs arranged sequentially in the radial direction of the air outlet shroud. The air outlet shroud includes annular ribs around a preset central axis, and the air guide ribs in two adjacent groups of air guide ribs are connected to the same annular rib.

[0009] Because the air guide ribs are radially distributed, the gap width on the inner side of the same air guide rib group is smaller than the gap width on the outer side. By setting multiple air guide rib groups arranged radially in sequence, the arrangement density of the air guide ribs in each group can be designed individually, thus ensuring that the gaps between the air guide ribs in each group meet safety requirements. Furthermore, by setting annular ribs and multiple air guide rib groups, the overall structural reliability of the air outlet grille is improved, avoiding the deformation risk caused by a single air guide rib being too long radially.

[0010] In an optional embodiment, in the radial direction of the air outlet shroud, in different groups of air guide ribs, the wavelength of the windward edge of the relatively inner air guide rib is greater than the wavelength of the windward edge of the relatively outer air guide rib, and / or, the wavelength of the air outlet edge of the relatively inner air guide rib is greater than the wavelength of the air outlet edge of the relatively outer air guide rib.

[0011] According to theoretical analysis, the fluid velocity distribution on the surface of an axial flow fan blade during operation exhibits the following pattern: as the radius increases, the circumferential velocity of the fluid gradually increases, thus the combined absolute velocity of the fluid also gradually increases. In this embodiment, the edge waveforms of the guide ribs in different guide rib groups have different wavelengths. Areas with high flow velocity use denser wave undulations (i.e., shorter wavelengths) to suppress noise, while areas with low flow velocity use sparser wave undulations (i.e., longer wavelengths) to suppress noise. This non-uniform wavelength distribution can specifically improve the dynamic and static interference noise in different frequency bands caused by velocity differences at different radial positions, thereby improving the overall noise suppression capability of the exhaust grille.

[0012] In an optional embodiment, the multiple air guide rib groups include a first air guide rib group, a second air guide rib group, and a third air guide rib group. These three groups are arranged sequentially from the inside to the outside along the radial direction of the air outlet shroud. The number of wave crests on the windward side edge of the air guide ribs in each group increases sequentially, as does the number of wave crests on the air outlet side edge. Each wave crest is the apex of the corresponding edge waveform closest to the air outlet shroud. More wave crests mean more wave undulations. Setting more wave crests on the outermost air guide ribs and fewer wave crests on the innermost air guide ribs effectively suppresses noise from airflows with different velocities at different radial locations.

[0013] In an optional implementation, the air guide ribs of two adjacent air guide rib groups are radially staggered.

[0014] In this embodiment, by offsetting the radially adjacent air guide ribs in the circumferential direction of the annular ribs, airflow pulsation can be reduced, thereby reducing aerodynamic noise.

[0015] In an optional embodiment, the air outlet grille further includes an outer shell, which includes a frame and a baffle plate. The air guide ribs are arranged inside the frame, and the baffle plate is arranged between the inner side of the frame and the outermost air guide ribs.

[0016] By designing an outer casing, the air outlet grille can be connected and fitted to the air conditioner's housing via the outer casing's frame. The baffle can seal the gap between the inner side of the frame and the air guide rib assembly, allowing all airflow to pass through the air guide rib assembly, thereby better utilizing the air guide rib assembly to even out airflow and suppress noise.

[0017] In an optional embodiment, the wind deflector is provided with reinforcing ribs. By providing reinforcing ribs, the structural strength of the wind deflector can be effectively increased, reducing the risk of deformation and damage.

[0018] In an optional embodiment, the air outlet grille also includes a central housing, around which the innermost air guide ribs are arranged. The central housing can block the area surrounded by the innermost air guide ribs, corresponding to the impeller hub area. The central housing can force airflow through the air guide ribs, thereby better utilizing the air guide ribs to homogenize airflow and suppress noise.

[0019] In an optional implementation, the waveform amplitude of the air outlet edge and / or the windward edge is 20% to 30% of the width of the air guide rib.

[0020] The waveform amplitude of the air outlet edge and the windward edge represents the height of the edge undulation. The width of the air guide rib is the height dimension of the air guide rib in the axial direction (i.e. the air outlet direction) of the air outlet mesh. By setting the waveform amplitude of the air outlet edge and / or the windward edge to 20%~30% of the width of the air guide rib, it is possible to give the air guide rib a better ability to suppress aerodynamic noise while ensuring its strength.

[0021] In an optional implementation, the curves of the outlet edge and the windward edge of the same air guide rib are consistent. This arrangement makes the air guide rib have a wavy shape as a whole, and the width of the same air guide rib is the same at all positions in the radial direction, avoiding the deterioration of the air guide rib strength due to excessive narrowness in some local positions.

[0022] In an optional implementation, in the same group of air guide ribs, the air outlet edge of each air guide rib is in phase at the same position from the preset central axis, and the windward edge of each air guide rib is in phase at the same position from the preset central axis.

[0023] Secondly, this application provides an outdoor unit for an air conditioner, including an air outlet cover as described in any of the foregoing embodiments; the air outlet cover is disposed between the fan and the air outlet frame of the indoor unit of the air conditioner, or the air outlet cover is disposed at the air outlet of the outdoor unit of the air conditioner. Attached Figure Description

[0024] Figure 1 This is a first schematic diagram of an air outlet mesh cover in one embodiment of this application; Figure 2 This is a second schematic diagram of the air outlet mesh cover in one embodiment of this application; Figure 3 for Figure 2 A sectional view along direction A. Figure 4 for Figure 1 Enlarged view of a local IV region; Figure 5 for Figure 3 A magnified view of a local V in the image.

[0025] Explanation of reference numerals in the attached drawings: 101-Guide rib; 102-Windward edge; 103-Outlet edge; 104-Crest; 105-Trough; 110-First guide rib group; 120-Second guide rib group; 130-Third guide rib group; 140-Annular rib; 200-Outer shell; 210-Frame; 220-Wind deflector; 230-Reinforcing rib; 300-Middle shell. Detailed Implementation

[0026] In related technologies, improving the noise level of air outlet grilles is often achieved by changing the gap size between the air guide ribs. However, from a safety perspective, the upper limit of the gap between the air guide ribs of the air outlet grille needs to be strictly controlled. Therefore, the noise suppression capability of air outlet grilles in related technologies is poor, and their effect on reducing the far-field aerodynamic noise level of air conditioners is very limited.

[0027] Therefore, this application provides an air outlet grille, which improves the shape of the air guide ribs of the air outlet grille so that both the air outlet side edge and the air inlet side edge are wavy, thereby effectively improving the suppression effect of aerodynamic noise.

[0028] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0029] Figure 1 This is a first schematic diagram of an air outlet mesh cover in one embodiment of this application; Figure 2 This is a second schematic diagram of the air outlet mesh cover in one embodiment of this application; Figure 3 for Figure 2 A sectional view along direction A. (e.g.) Figures 1 to 3 As shown in the embodiment of this application, the air outlet grille includes an outer shell 200, an inner shell, and at least one group of air guide ribs surrounding a preset central axis L. In this embodiment, the extension direction of the preset central axis L is the air outlet direction of the air outlet grille. When the air outlet grille is assembled in an air conditioner, the preset central axis L coincides with the axis of the axial fan blades in the air conditioner. It should be noted that the axial direction described below refers to the extension direction of the preset central axis L, while the radial direction is perpendicular to the preset central axis L.

[0030] The air guide rib assembly includes multiple air guide ribs 101 arranged at intervals around a preset central axis L, with each air guide rib 101 extending radially in the air outlet grille. In this embodiment, the air guide ribs 101 extend radially while also having a certain deflection in the circumferential direction around the preset central axis L, so that each air guide rib 101 has a consistent rotation direction, which facilitates the smooth passage of airflow generated by the axial fan blades through the air guide rib assembly.

[0031] Figure 4 for Figure 1 Enlarged view of a local IV region; Figure 5 for Figure 3 A magnified view of a local V in the image. (See image below.) Figure 4 and Figure 5As shown in this application, each air guide rib 101 includes a windward edge 102 and an outlet edge 103 opposite to each other in the air outlet direction of the air outlet shroud. Both the windward edge 102 and the outlet edge 103 are wavy edges. Research has shown that by changing the aerodynamic shape of the air guide rib 101, making the windward edge 102 and the outlet edge 103 wavy, the airflow at different radial positions enters / leaves the gap between the air guide ribs at different times. For example, the windward edge 102 of the air guide rib 101 has two peaks and a trough between the two peaks. The peak is the point closest to the outside of the air outlet shroud, and the trough is the point closest to the inside of the air outlet shroud. The three airflows correspond to two peaks and one trough respectively. Therefore, the two airflows on the sides can reach the trough of the air guide rib 101 first, while the airflow in the middle will reach the peak of the air guide rib 101 later. Similarly, the three airflows will leave the outlet edge 103 of the air guide rib 101 at different times, with the airflow at the trough position leaving first and the airflow at the crest position leaving later. This setting can effectively reduce airflow pulsation when the airflow passes through the air guide rib 101, thereby reducing the aerodynamic noise level at the outlet grille.

[0032] Reference Figures 1 to 5 In this embodiment, the air outlet cover includes multiple air guide rib groups, which are arranged sequentially in the radial direction of the air outlet cover. The air outlet cover includes annular ribs 140 around a preset central axis, and the air guide ribs 101 in two adjacent air guide rib groups are connected to the same annular rib 140.

[0033] Since the air guide ribs 101 are radially distributed, the gap width on the inner side of the same air guide rib group is smaller than the gap width on the outer side. Therefore, if the air guide rib 101 is too long in the radial direction, the gap at the outer end in the radial direction will easily be too wide, failing to meet safety requirements. By setting multiple air guide rib groups arranged sequentially in the radial direction, excessively long air guide ribs can be avoided, and the arrangement density of air guide ribs 101 in each air guide rib group can be designed individually, thus ensuring that the gap of air guide ribs 101 in each air guide rib group meets safety requirements. Furthermore, by setting the annular rib 140 and multiple air guide rib groups, the overall structural reliability of the air outlet grille is improved, avoiding the risk of deformation caused by a single excessively long air guide rib 101 in the radial direction.

[0034] In this embodiment, the air outlet grille has three sets of air guide ribs, namely, a first set of air guide ribs 110, a second set of air guide ribs 120, and a third set of air guide ribs 130, from the inside out. The air outlet grille includes three annular ribs 140, which are respectively disposed between the first set of air guide ribs 110 and the second set of air guide ribs 120, between the second set of air guide ribs 120 and the third set of air guide ribs 130, and on the outer side of the third set of air guide ribs 130. It should be understood that the number of air guide rib sets and the number of annular ribs 140 can be adjusted as needed.

[0035] Optionally, the individual air guide ribs 101 in the same air guide rib group have the same structure, and the multiple air guide ribs 101 are arranged in a circular array, with the annular ribs 140 being perfectly circular.

[0036] In this embodiment, in the radial direction of the air outlet mesh, among different groups of air guide ribs, the wavelength of the windward edge 102 of the relatively inner air guide rib 101 is greater than the wavelength of the windward edge 102 of the relatively outer air guide rib 101, and / or, the wavelength of the air outlet edge 103 of the relatively inner air guide rib 101 is greater than the wavelength of the air outlet edge 103 of the relatively outer air guide rib 101. The wavelength of the windward edge 102 and the wavelength of the air outlet edge 103 refer to the distance between two adjacent peaks 104 or two adjacent troughs 105 of the corresponding edge waveform. It should be understood that the actual edge may not have two peaks 104 or two troughs 105. In this case, the waveform should be determined according to the edge shape, and then the wavelength of the edge should be determined by the waveform.

[0037] According to theoretical analysis, the fluid velocity distribution on the surface of the axial flow fan blades exhibits the following pattern: as the radius increases, the circumferential velocity of the fluid gradually increases, thus the combined absolute velocity of the fluid also gradually increases. In this embodiment, the edge waveforms of the guide ribs 101 in different guide rib groups have different wavelengths. Areas with high flow velocity use denser wave undulations (i.e., shorter wavelengths) to suppress noise, while areas with low flow velocity use sparser wave undulations (i.e., longer wavelengths) to suppress noise. This non-uniform wavelength distribution can specifically improve the dynamic and static interference noise in different frequency bands caused by the velocity difference at different radial positions, thereby improving the overall noise suppression capability of the exhaust grille.

[0038] Optionally, in two adjacent groups of air guide ribs, the wavelength of the air guide rib 101 in the radially inner group is 1.2 to 2 times the wavelength of the air guide rib 101 in the radially outer group. Optionally, in the same air guide rib 101, the wavelengths of the edges (including the air outlet edge 103 and the windward edge 102) at different radial positions are the same.

[0039] Optionally, the waveform amplitude of the outlet edge 103 and / or the windward edge 102 is 20% to 30% of the width of the guide rib 101, wherein the width of the guide rib 101 is its dimension in the air outlet direction of the air outlet shroud. The waveform amplitude of the outlet edge 103 and the windward edge 102 characterizes the edge undulation height, and the width of the guide rib 101 is its height dimension in the axial direction (i.e., the air outlet direction) of the air outlet shroud. By setting the waveform amplitude of the outlet edge 103 and / or the windward edge 102 to 20% to 30% of the width of the guide rib 101, it is possible to give the guide rib 101 a better ability to suppress aerodynamic noise while ensuring its strength. It should be understood that the width of the guide rib 101 can be its average width, and the waveform amplitude is half of the height difference between the peak 104 and the trough 105.

[0040] In this embodiment, the number of wave crests 104 on the windward side edge 102 of the guide ribs 101 in the first guide rib group 110, the second guide rib group 120, and the third guide rib group 130 increases sequentially. Similarly, the number of wave crests 104 on the air outlet side edge 103 of the guide ribs 101 in the first guide rib group 110, the second guide rib group 120, and the third guide rib group 130 increases sequentially. Each wave crest 104 is the apex of the corresponding edge waveform closest to the air outlet mesh (i.e., the outer side). More wave crests 104 mean more wave undulations. Setting more wave crests 104 on the outer guide ribs 101 and fewer wave crests 104 on the inner guide ribs 101 effectively suppresses noise from airflows at different radial positions and velocities.

[0041] In this embodiment, the first air guide rib group 110 has one wave crest 104 on the windward side edge 102 of the air guide rib 101 and one wave crest 104 on the air outlet side edge 103; the second air guide rib group 120 has one wave crest 104 on the windward side edge 102 of the air guide rib 101 and two wave crests 104 on the air outlet side edge 103; and the third air guide rib group 130 has three wave crests 104 on the windward side edge 102 of the air guide rib 101 and three wave crests 104 on the air outlet side edge 103. Figure 4 The air outlet edge 103 of the air guide rib 101 in the third air guide rib group 130 is shown to have three peaks 104.

[0042] Optionally, the curves of the outlet edge 103 and the windward edge 102 of the same air guide rib 101 are consistent. By setting it in this way, the air guide rib 101 can be made to have a wavy shape as a whole, and the width of the same air guide rib 101 is the same at all positions in the radial direction, so as to avoid the deterioration of the strength of the air guide rib 101 due to excessive narrowness in some local positions.

[0043] Furthermore, within the same air guide rib group, the air outlet edges of each air guide rib are in phase at the same distance L from the preset central axis, and the air front edges of each air guide rib are also in phase at the same distance L from the preset central axis. For example, in the same air guide rib group, if the air outlet edge 103 (or air front edge 102) of one air guide rib 101 has a peak at 20cm from the preset central axis, then the air outlet edge 103 (or air front edge 102) of the other air guide ribs 101 in that air guide rib group also has a peak at 20cm from the preset central axis. This arrangement ensures better consistency among the air guide ribs 101 in the air guide rib group, with the edges of adjacent air guide ribs 101 being flush in the circumferential direction, resulting in more uniform airflow.

[0044] Optionally, the guide ribs 101 of two adjacent guide rib groups are staggered radially. By staggering the radially adjacent guide ribs 101 in the circumferential direction of the annular rib 140, airflow pulsation can be reduced, thereby reducing aerodynamic noise.

[0045] Optionally, along the radial direction of the air outlet shroud, from the inside to the outside, the wavelengths of the windward edge 102 and the air outlet edge 103 of the air guide ribs 101 gradually shorten. By setting this non-uniform wavelength distribution, the dynamic and static interference noise caused by the velocity difference at different radial positions can be specifically improved, thereby enhancing the overall noise suppression capability of the air outlet shroud, especially when the number of air guide ribs is small and the radial length of the air guide ribs 101 is relatively long.

[0046] In this embodiment, the outer casing 200 includes a frame 210 and a baffle 220. The air guide ribs are disposed within the frame 210, and the baffle 220 is located between the inner side of the frame 210 and the outermost air guide rib group (specifically, the third air guide rib group 130 in this embodiment). By providing the outer casing 200, the air outlet grille can be connected to the air conditioner casing via the frame 210 of the outer casing 200. Specifically, it can be connected to the air conditioner casing using fasteners (including but not limited to screws) or snap-fit ​​structures. The baffle 220 can seal the gap between the inner side of the frame 210 and the air guide rib group, allowing all airflow to pass through the air guide rib group, thereby better utilizing the air guide rib group to homogenize airflow and suppress noise. In this embodiment, the frame 210 is square, and the outermost annular ribs 140 are tangent to the frame 210, thus having four connection points with the frame 210. In other embodiments, the shape of the frame 210 can be changed as needed.

[0047] Furthermore, the wind deflector 220 is provided with reinforcing ribs 230. By providing reinforcing ribs 230, the structural strength of the wind deflector 220 can be effectively increased, reducing the risk of deformation and damage. One end of the reinforcing rib 230 is connected to the inner side of the frame 210, and the other end is connected to the outermost annular rib 140.

[0048] In this embodiment, the innermost air guide rib group (specifically the first air guide rib group 110 in this embodiment) is arranged around the middle housing 300, wherein the end of the air guide rib 101 near the preset central axis L is connected to the middle housing 300. The middle housing 300 can block the area surrounded by the innermost air guide rib group (corresponding to the impeller hub area), and the middle housing 300 can force the airflow to pass through the air guide rib group, thereby better utilizing the air guide rib group to homogenize the airflow and suppress noise.

[0049] To illustrate the beneficial effects of the air outlet grille provided in this application embodiment, a comparative test was conducted between the air outlet grille provided in this application embodiment and an existing air outlet grille. The existing air outlet grille has the same dimensions and the layout of the guide ribs as the air outlet grille provided in this application embodiment, the difference being that the windward and outlet edges of the guide ribs have no undulations in the air outlet direction. By comparing the air volume under the same fan power, the air volume of the air outlet grille provided in this application embodiment is 2775 m³ / h. 3 / h, the air volume of the existing air outlet mesh cover is 2763 m³ / h. 3 / h. It can be seen that the exhaust grille of this embodiment has a diameter of 12 m. 3 / h air volume increase.

[0050] Numerical simulations show that the surface sound pressure distribution of the air outlet grille provided in this embodiment is more uniform, and the overall coverage area of ​​high-pressure fluctuations on the plane and along the axial direction of the air outlet grille is smaller. The sound sources are mainly distributed at the troughs of the air guide ribs 101.

[0051] The static pressure distribution of the air outlet side of the air outlet mesh was tested. The static pressure amplitude of the air outlet mesh in the embodiment of this application is lower at the far-field acoustic measurement point, indicating that the improvement of the air outlet mesh in this application helps to reduce the acoustic pressure amplitude at this point.

[0052] Sound pressure data at far-field acoustic measurement points were collected and compared between the air outlet grille of this application embodiment and the air outlet grille of the prior art, and converted into sound pressure level spectrum. The results show that the air outlet grille of this application embodiment can reduce the peak frequency component of wind turbine blades and broadband noise components in the far-field noise, and has a significant optimization effect on noise in the 500~1500Hz frequency band.

[0053] This application also provides an air conditioner (not shown in the figure) including the air outlet grille of any of the foregoing embodiments. Further, the air conditioner also includes an axial flow fan, the axis of which coincides with the preset central axis L of the air outlet grille. Types of air conditioners include, but are not limited to, outdoor units, indoor units, and portable air conditioners. When the air conditioner is an indoor unit, the air outlet grille is disposed between the fan and the air outlet frame; when the air conditioner is an outdoor unit, the air outlet grille is disposed at the air outlet of the outdoor unit.

[0054] While this application discloses the above information, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of this application; therefore, the scope of protection of this application shall be determined by the scope defined in the claims.

Claims

1. An air outlet mesh cover, characterized in that, The device includes at least one group of air guide ribs surrounding a preset central axis. The group of air guide ribs includes a plurality of air guide ribs (101) arranged at intervals around the preset central axis. The air guide ribs (101) extend radially in the air outlet mesh cover. The air guide ribs (101) within the same group of air guide ribs have the same width. The width of the air guide ribs (101) is the dimension of the air guide ribs (101) in the air outlet direction of the air outlet mesh cover. Each air guide rib (101) includes an opposing windward edge (102) and an air outlet edge (103). Both the windward edge (102) and the air outlet edge (103) are wavy edges.

2. The air outlet mesh cover according to claim 1, characterized in that, Along the radial direction of the air outlet mesh, from the inside to the outside, the wavelengths of the windward edge (102) and the air outlet edge (103) of the air guide rib (101) gradually become shorter.

3. The air outlet mesh cover according to claim 1 or 2, characterized in that, The air outlet mesh cover includes multiple air guide rib groups, which are arranged sequentially in the radial direction of the air outlet mesh cover. The air outlet mesh cover includes annular ribs (140) around the preset central axis, and the air guide ribs (101) in two adjacent air guide rib groups are connected to the same annular rib (140).

4. The air outlet mesh cover according to claim 3, characterized in that, In the radial direction of the air outlet mesh, among the different groups of air guide ribs, the wavelength of the windward side edge (102) of the relatively inner air guide rib (101) is greater than the wavelength of the windward side edge (102) of the relatively outer air guide rib (101), and / or, the wavelength of the air outlet side edge (103) of the relatively inner air guide rib (101) is greater than the wavelength of the air outlet side edge (103) of the relatively outer air guide rib (101).

5. The air outlet mesh cover according to claim 4, characterized in that, The plurality of air guide rib groups include a first air guide rib group (110), a second air guide rib group (120), and a third air guide rib group (130). The first air guide rib group (110), the second air guide rib group (120), and the third air guide rib group (130) are arranged sequentially from the inside to the outside along the radial direction of the air outlet mesh. The number of wave peaks (104) on the windward side edge (102) of the air guide rib (101) in the first air guide rib group (110), the second air guide rib group (120) and the third air guide rib group (130) increases sequentially. The number of wave peaks (104) on the air outlet side edge (103) of the air guide rib (101) in the first air guide rib group (110), the second air guide rib group (120) and the third air guide rib group (130) increases sequentially. The wave peak (104) is the vertex of the corresponding edge waveform that is closest to the air outlet side of the air outlet mesh.

6. The air outlet mesh cover according to claim 3, characterized in that, The air guide ribs (101) of two adjacent air guide rib groups are staggered in the radial direction.

7. The air outlet mesh cover according to claim 3, characterized in that, The air outlet cover also includes an outer shell (200), the outer shell (200) includes a frame (210) and a baffle (220), the air guide ribs are disposed inside the frame (210), and the baffle (220) is disposed between the inner side of the frame (210) and the outermost air guide ribs.

8. The air outlet mesh cover according to claim 7, characterized in that, The wind deflector (220) is provided with reinforcing ribs (230).

9. The air outlet mesh cover according to claim 3, characterized in that, The air outlet grille also includes a central housing (300), and the innermost air guide ribs are arranged around the central housing (300).

10. The air outlet mesh cover according to claim 1 or 2, characterized in that, The waveform amplitude of the air outlet edge (103) and / or the windward edge (102) is 20% to 30% of the width of the air guide rib (101).

11. The air outlet mesh cover according to claim 1 or 2, characterized in that, The curves of the air outlet edge (103) and the windward edge (102) of the same air guide rib (101) are consistent.

12. The air outlet mesh cover according to claim 11, characterized in that, In the same group of air guide ribs, the air outlet edge (103) of each air guide rib (101) is in phase at the same position from the preset central axis, and the windward edge (102) of each air guide rib (101) is in phase at the same position from the preset central axis.

13. An air conditioner, characterized in that, Includes the air outlet mesh cover according to any one of claims 1-12; the air outlet mesh cover is disposed between the fan and the air outlet frame of the indoor unit of the air conditioner, or the air outlet mesh cover is disposed at the air outlet of the outdoor unit of the air conditioner.

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