Air outlet grille and air conditioner outdoor unit comprising same

Abstract

Disclosed in the present application are an air outlet grille and an air conditioner outdoor unit comprising same. The air outlet grille is used for connecting to the outer side of a fan so as to guide the air outlet direction of the fan. The air outlet grille comprises a center disc, a frame, and a plurality of radial ribs. The maximum diameter of the center disc of the air outlet grille is set to be 1.01-1.3 times the diameter of a hub of the fan. By means of setting the maximum diameter of the center disc to be 1.01-1.3 times the diameter of the hub of the fan, the air outlet grille of the present application can effectively block low-pressure backflow, thereby reducing the negative impact of backflow on the work done by blades, and the air outlet grille can reduce the turbulence intensity at the roots of the blades, thereby improving the performance of the fan while reducing noise. Moreover, the flow of high-pressure airflow is not blocked due to the excessively large size of the center disc.

Description

Air outlet screen and air conditioner outdoor unit comprising same TECHNICAL FIELD

[0001] The present application relates to the field of air conditioning systems, and in particular to an air outlet screen and an air conditioner outdoor unit comprising same. BACKGROUND

[0002] An air conditioner outdoor unit comprises a fan and an air outlet screen. The fan drives hot air inside the air conditioner outdoor unit to flow outward through the air outlet screen to cool components inside the air conditioner outdoor unit, such as a condenser and a compressor. The fan is generally an axial fan comprising a hub and a plurality of blades arranged around the hub. The blades are rotatable to drive airflow to flow axially from inside to outside. The air outlet screen is arranged outside the fan to guide the flow direction of the airflow discharged from the fan and to protect the fan. SUMMARY

[0003] At least one object of the present application in the first aspect is to provide an air outlet screen for connecting outside a fan to guide the air outlet direction of the fan. The air outlet screen comprises a center disc, a rim and a plurality of radial ribs. The center disc is arranged at the middle of the air outlet screen. The rim is arranged at the outer edge of the air outlet screen. The plurality of radial ribs are arranged radially from the center disc to the rim, and each radial rib is connected between the center disc and the rim. The air outlet screen has an air outlet side and an air inlet side, and is arranged to guide the airflow discharged from the fan to flow from the air inlet side to the air outlet side. The maximum diameter of the center disc of the air outlet screen is set to be 1.01-1.3 times the diameter of the hub of the fan.

[0004] According to the above first aspect, the air outlet screen has an air outlet side and an air inlet side, and is arranged to guide the airflow discharged from the fan to flow from the air inlet side to the air outlet side. The center disc comprises oppositely arranged disc bottom and disc top openings. The disc bottom is directed toward the air inlet side, and the disc top opening is directed toward the air outlet side. The center disc further comprises a disc side portion surrounding the disc bottom. The disc side portion extends from the disc bottom toward the air outlet side, and the top edge of the disc side portion defines the disc top opening.

[0005] According to the above first aspect, the disc side portion extends upward and outward in the direction toward the air outlet side to form a maximum diameter at the top edge of the disc side portion.

[0006] According to the above first aspect, the disc side portion is a streamline shape, and is smoothly connected between the disc bottom and the disc side portion.

[0007] According to the first aspect, the center disc is in a shape of a flat-bottomed pan, wherein a bottom of the disc is in a shape of a flat plate, and a side of the disc is in a shape of a smooth arc, and wherein the radial ribs are connected to the side of the disc.

[0008] According to the first aspect, the center disc is in a shape of a bowl, wherein a bottom of the disc is in a shape of a round bottom, and a side of the disc is in a shape of a smooth arc.

[0009] According to the first aspect, the center disc further comprises a turned-up edge turned down from a top edge of the side of the disc, and wherein the radial ribs are connected to the turned-up edge.

[0010] According to the first aspect, the air outlet mesh cover further comprises a plurality of circumferential ribs, each of the circumferential ribs is in a shape of a concentric ring surrounding the center disc, and the plurality of circumferential ribs are arranged in a spaced manner, and each of the circumferential ribs is connected to at least a portion of the radial ribs.

[0011] According to the first aspect, the air outlet mesh cover has an axial direction, in the axial direction of the air outlet mesh cover, the circumferential ribs and the radial ribs are arranged in a layered manner so that the circumferential ribs and the radial ribs partially overlap, and wherein the circumferential ribs extend along the axial direction.

[0012] According to the first aspect, the air outlet mesh cover has an exhaust passage at least partially defined by the adjacent radial ribs, the exhaust passage is arranged to guide the airflow discharged from the fan to flow through the exhaust passage from the air inlet side to the air outlet side. Wherein the radial ribs are arranged so that the exhaust passage extends obliquely along the air outlet direction of the fan at the air inlet side.

[0013] The present application provides an air conditioner outdoor unit in a second aspect, comprising a fan and the air outlet mesh cover of any one of the first aspect. Wherein the air outlet mesh cover is connected to the outside of the fan to guide the airflow discharged from the fan to flow from the air inlet side to the air outlet side.

[0014] Other characteristics, advantages and embodiments of the present application can be set forth or made apparent in consideration of the following detailed description, annexed drawings and claims. Moreover, it should be understood that the foregoing summary and the following detailed description are exemplary and intended to provide further explanation without limiting the scope of the claimed application. However, the detailed description and specific examples are merely indicative of the preferred embodiments of the present application. Various changes and modifications will become apparent to those skilled in the art within the spirit and scope of the present application from the detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0015] FIG. 1A is a perspective view of an air outlet screen according to an embodiment of the present application;

[0016] FIG. 1B is a plan view of the air outlet screen of FIG. 1A;

[0017] FIG. 2A is a sectional view of the air outlet screen of FIG. 1B taken along line A-A;

[0018] FIG. 2B is a sectional view of the air outlet screen and a fan of FIG. 2A;

[0019] FIG. 3 is a sectional view of an embodiment of a radial rib of FIG. 1A;

[0020] FIG. 4 is a sectional view of another embodiment of a radial rib of FIG. 1A;

[0021] FIG. 5A is a perspective view of an outdoor unit of an air conditioner according to an embodiment of the present application;

[0022] FIG. 5B is a partial view of the outdoor unit of FIG. 5A;

[0023] FIG. 6 is a sectional view of an air outlet screen according to another embodiment of the present application;

[0024] FIG. 7 is a sectional view of an air outlet screen according to still another embodiment of the present application;

[0025] FIG. 8A is a turbulence intensity effect diagram of an air outlet screen of a comparative example;

[0026] FIG. 8B is a turbulence intensity effect diagram of the air outlet screen of FIG. 2B;

[0027] FIG. 9A is a backflow effect diagram of an air outlet screen of a comparative example;

[0028] FIG. 9B is a backflow effect diagram of the air outlet screen of FIG. 2B;

[0029] FIG. 10A is a perspective view of an air outlet screen according to still another embodiment of the present application;

[0030] FIG. 10B is a sectional view of the air outlet screen of FIG. 10A. DETAILED DESCRIPTION

[0031] Various specific embodiments of the present application will be described below with reference to the accompanying drawings, which are incorporated in, and constitute a part of, this specification. It should be understood that, although terms indicating directions, such as "front", "back", "upper", "lower", "left", "right", "top", "bottom", and the like are used in the present application to describe various example structural parts and elements of the present application, these terms are used herein only for the purpose of convenience of explanation, and are determined based on the example orientation shown in the accompanying drawings. Since the embodiments disclosed in the present application can be arranged in different directions, these terms indicating directions are only for illustration and should not be considered as limiting.

[0032] FIGS. 1A and 1B are structural diagrams of one embodiment of an air outlet screen 100 of the present application, for showing the general structure of the air outlet screen 100, in which FIG. 1A is a perspective structural diagram of the air outlet screen 100, and FIG. 1B is a plan view of the air outlet screen 100. In the embodiment of the present application, a blower 220 (see FIG. 2B) is a axial blower, which has an axial direction. The air outlet screen 100 has an axial direction, in which the height direction of the air outlet screen 100 is the axial direction thereof. The axial direction of the air outlet screen 100 coincides with the axial direction of the blower 220.

[0033] As shown in FIGS. 1A and 1B, the air outlet screen 100 has an air inlet side 105 and an air outlet side 106 at opposite sides in the axial direction thereof, and an exhaust passage 108 that communicates the air inlet side 105 and the air outlet side 106. In the angle as shown in FIG. 1A, the air inlet side 105 is disposed below the air outlet screen 100, the air outlet side 106 is disposed above the air outlet screen 100, and the blower 220 is connected below the air outlet screen 100. The air outlet screen 100 guides the air flow discharged from the blower 220 to flow from the air inlet side 105 to the air outlet side 106 along the exhaust passage 108.

[0034] The air outlet screen 100 comprises a center disc 102, a rim 101, a plurality of radial ribs 104, and a plurality of circumferential ribs 103. The center disc 102 is disposed at the middle of the air outlet screen 100, and has a disc shape perpendicular to the axial direction. The rim 101 is disposed at the outer edge of the air outlet screen 100. The plurality of radial ribs 104 are arranged radially from the center disc 102 to the rim 101. Each radial rib 104 has a curved strip shape extending substantially in the radial direction, and has one end connected to the center disc 102 and the other end connected to the rim 101. The curved direction of the radial rib 104 is the same as the rotating direction of the blade 221 of the fan 220. As a specific example, in the fan 220 matched with the air outlet screen 100 shown in FIG. 1B, the blade 221 rotates in the counterclockwise direction. The plurality of circumferential ribs 103 have a concentric ring shape extending in the circumferential direction around the center disc 102, and are arranged at intervals. Each circumferential rib 103 is fixed by being connected to at least a part of the radial ribs 104. In this embodiment, the plurality of circumferential ribs 103 have the same axial height and are aligned in the axial direction, and the plurality of radial ribs 104 also have the same axial height and are aligned in the axial direction.

[0035] In this embodiment, the rim 101 limits the outer edge of the air outlet screen 100, and has a substantially axially symmetrical fisheye shape. Those skilled in the art can understand that, based on the specific shape of the rim 101, the circumferential rib 103 of the inner ring is connected to each radial rib 104, and the circumferential rib 103 of the outer ring is fixed by being connected to the rim 101 or simultaneously connected to part of the radial rib 104 and the rim 101. In other embodiments, the rim 101 can also not be symmetrical, as long as it can cover the air outlet range of the fan. Accordingly, the radial rib 104 is connected between the center disc 102 and the rim 101, and the circumferential rib 103 is connected to the radial rib 104, the rim 101, or the rim 101 and part of the radial rib 104.

[0036] Thus, the plurality of circumferential ribs 103 and the plurality of radial ribs 104 are arranged in a substantially grid shape, and the exhaust passages 108 are defined between adjacent radial ribs 104 and between adjacent circumferential ribs 103.

[0037] Figures 2A and 2B show cross-sectional views of the air outlet shroud 100 along the line A-A to illustrate the more specific structure of the circumferential ribs 103 and the radial ribs 104. As shown in Figures 2A and 2B, the fan 220 is an axial fan, which includes a hub 210 and a plurality of blades 221, the roots of the blades 221 being connected to the hub 210. When the fan 220 is in operation, the blades 221 rotate around the hub 210 to drive the airflow to flow from the air inlet side 105 to the air outlet side 106 of the air outlet shroud 100 (i.e. from right to left in Figure 2B). In the present embodiment, the air outlet shroud 100 and the hub 210 have a common axis x, and the air outlet shroud 100 and the hub 210 are each symmetrical with respect to the axis x.

[0038] In the present embodiment, the circumferential ribs 103 and the radial ribs 104 partially overlap or do not completely overlap in the axial direction, the circumferential ribs 103 being towards the air outlet side 106, and the radial ribs 104 being towards the air inlet side 105. In this way, the airflow discharged from the fan 220 and flowing through the exhaust passage 108 of the air outlet shroud 100 can first flow through the radial ribs 104 and then flow through the circumferential ribs 103. That is, in at least a portion of the flow path of the airflow flowing through the exhaust passage 108, only the circumferential ribs 103 or only the radial ribs 104 are included. Since the airflow flowing through the exhaust passage 108 is blocked by the circumferential ribs 103 and the radial ribs 104, this arrangement can increase the flow area of the airflow, reduce the flow speed of the airflow, thereby reducing the turbulence intensity of the airflow and reducing the local pressure loss of the airflow.

[0039] Specifically, each radial fin 104 includes a plurality of overlapping portions 244 which are arranged at intervals on the top of the radial fin 104 (i.e. the left side of the radial fin 104 in FIG. 2B). The circumferential fin 103 overlaps with the radial fin 104 at each overlapping portion 244, so that the circumferential fin 103 can be connected to the radial fin 104, thereby ensuring the connection strength of the circumferential fin 103. In some embodiments, the overlapping portion 244 is in the shape of a groove for accommodating the bottom of the circumferential fin 103 and fixedly connected to the bottom of the circumferential fin 103 by welding or the like. The axial height of the overlapping portion 244 can be set according to specific needs. For example, the greater the axial height of the overlapping portion 244, the greater the connection strength of the circumferential fin 103 and the radial fin 104. The smaller the axial height of the overlapping portion 244, the smaller the flow distance of the airflow flowing through the circumferential fin 103 and the radial fin 104 at the same time, and the better the effect of reducing the turbulence intensity and local pressure loss of the airflow. Within the axial height limit of the whole air outlet mesh cover 100, the axial height of the overlapping portion 244 is preferably as small as possible while ensuring the connection strength of the circumferential fin 103 and the radial fin 104. In some specific embodiments, the axial height of each overlapping portion 244 is substantially the same, and the axial height is 0.5-6 mm. In some specific embodiments, the axial height of each overlapping portion 244 is 2-5 mm.

[0040] In the present embodiment, the exhaust passage 108 is arranged such that the air inlet angle of the air inlet side 105 is consistent with the air outlet angle of the fan 220, and the air outlet angle of the air outlet side 106 is parallel to the axial direction. Thus, the airflow discharged from the fan 220 first flows along the air outlet angle of the fan 220 in the exhaust passage 108, and then flows along the axial direction to be discharged from the air outlet mesh cover 100. Such an arrangement can be beneficial to convert part of the dynamic pressure of the airflow discharged from the fan 220 into static pressure, thereby reducing the flow rate of the airflow discharged from the air outlet mesh cover 100 and increasing the flow volume of the airflow, and reducing the noise of the airflow.

[0041] As an example, the radial fins 104 are arranged such that the exhaust passages 108 extend obliquely along the air outlet direction of the fan 220 at the air inlet side 105. Also, the circumferential fins 103 are arranged such that the exhaust passages 108 extend obliquely along the axial direction at the air outlet side 106. Specifically, each radial fin 104 includes a radial fin bottom portion 213 and a radial fin top portion 214 connected to each other. The radial fin bottom portion 213 is located at the bottom of the radial fin 104 and arranged toward the air inlet side 105. The radial fin top portion 214 is located at the top of the radial fin 104 and arranged toward the air outlet side 106. In the present embodiment, the radial fin top portion 214 extends along the axial direction and forms an overlapping portion 244. The radial fin bottom portion 213 extends obliquely along the air outlet direction of the fan. The greater the axial height of the radial fin 104, the more gradual the transition between the radial fin top portion 214 and the bottom of the radial fin bottom portion 213, which allows for more efficient conversion of a portion of the dynamic pressure of the airflow into static pressure. More specifically, each radial fin 104 includes a pair of radial fin side walls 211 that define a portion of the exhaust passage 108 between the radial fin side walls 211 of adjacent radial fins 104. Thus, the airflow discharged from the fan 220 first flows along the radial fin side walls 211 of the radial fin bottom portion 213 when entering the exhaust passage 108.

[0042] The radial fin side walls 211 of each radial fin bottom portion 213 are arranged to extend obliquely along the air outlet direction of the fan 220 to allow the dynamic pressure of the airflow to be converted into static pressure when the airflow enters the exhaust passage 108, thereby increasing the air outlet flow rate and reducing the noise during air outlet. The radial fin side walls 211 of each radial fin top portion 214 are arranged to extend along the axial direction. As an example, each radial fin 104 is streamlined, with smooth connections between the radial fin side walls 211 of the radial fin top portion 214 and the radial fin bottom portion 213, and between the pair of radial fin side walls 211 of the radial fin bottom portion 213. This allows for better reduction of pressure loss of the airflow during flow. As some specific examples, the radial fin 104 can have a cross-sectional shape that is a circular arc or an ellipse with uniform thickness, or a wing shape with non-uniform thickness. More specific shapes of the radial fin 104 will be described below in connection with two embodiments shown in FIGS. 3 and 4.

[0043] The center disc 102 is generally disc-shaped, including a disc bottom 231 and a disc top opening 233 disposed opposite each other, and a disc side 232 surrounding and connected to the disc bottom 231. The disc bottom 231 faces the air inlet side 105, the disc top opening 233 faces the air outlet side 106, and the disc side 232 extends from the disc bottom 231 toward the air outlet side 106. The disc top opening 233 is defined at a top edge 235 of the disc side 232. The end of each radial rib 104 is connected to the disc side 232 of the center disc 102.

[0044] As an example, the disc side 232 extends outwardly, for example, smoothly, in a direction from bottom to top toward the air outlet side 106, so that the diameter of the disc top opening 233 is larger than the diameter of the disc bottom 231, and the maximum diameter D1 of the center disc 102 is formed at the top edge 235 of the disc side 232. In this embodiment, the maximum diameter D1 of the center disc 102 is 1.01-1.3 times the diameter D2 of the hub 210 of the fan 220.

[0045] The applicant found that, due to the high-pressure airflow blowing out of the outlet area of the blade 221, and no blade working in the center of the hub 210, a low-pressure area is formed between the hub 210 and the center disc 102. If the maximum diameter of the center disc 102 is equal to or smaller than the diameter of the hub 210 of the fan 220, the high-pressure airflow will directly flow back to the low-pressure direction. There is a vortex between the high-pressure airflow and the low-pressure backflow, which not only dissipates energy, increases the intensity of turbulence, increases power consumption, but also increases the noise of the fan 220. Moreover, the low-pressure backflow also increases the working of the motor, which destroys the working load of the root of the blade 221.

[0046] The present application sets the disc top opening 233 of the center disc 102 away from the outside of the hub 210, and sets the maximum diameter D1 of the center disc 102 to be 1.01-1.3 times the diameter D2 of the hub 210 of the fan 220, so that the center disc 102 can effectively block the low-pressure backflow on one side of the disc top opening 233, and reduce the negative impact of the low-pressure backflow on the working of the blade 221. Moreover, since the disc side 232 is smooth and streamlined, the high-pressure airflow can be better guided to flow out along the disc side 232, thereby reducing the turbulence intensity near the blade 221. Thus, the air outlet mesh cover 100 can improve the performance of the fan 220 while reducing the noise. Moreover, setting the maximum diameter D1 of the center disc 102 to be 1.01-1.3 times the diameter D2 of the hub 210 of the fan 220 will not reduce the air outlet area or block the flow of high-pressure airflow due to the size of the center disc 102 being too large.

[0047] As an embodiment, the disc side portion 232 is streamlined, and the disc side portion 232 is smoothly connected with the disc bottom portion 231, which can facilitate the high-pressure airflow to flow along the disc side portion 232. As a specific embodiment, the center disc 102 is in the shape of a flat-bottomed pan, the disc bottom portion 231 is in the shape of a flat plate, and the disc side portion 232 is in the shape of a smooth arc. This arrangement can facilitate the end of the radial rib 104 to be firmly connected to the disc side portion 232, and can guide the high-pressure airflow to flow. In other embodiments, the center disc can also be in the shape of a bowl or other streamlined shape. Those skilled in the art can understand that, in some embodiments, the center disc can be arranged in the shape of a flat plate, i.e., only including the disc bottom portion without the disc top opening and the disc side portion, as long as the maximum diameter of the center disc meets the requirements.

[0048] Therefore, by arranging the circumferential rib 103 and the radial rib 104 to be not completely overlapped in the axial direction, so that only the circumferential rib 103 or only the radial rib 104 is included in at least part of the flow path of the airflow flowing through the exhaust passage 108, the flow area of the airflow discharged from the fan can be increased, the flow speed of the airflow can be reduced, the turbulence intensity of the airflow can be reduced, and the local pressure loss of the airflow can be reduced.

[0049] By arranging the radial rib 104 such that the exhaust passage 108 extends obliquely along the air outlet direction of the fan 220 at the air inlet side 105, the dynamic pressure of the airflow discharged from the fan can be converted into static pressure when the airflow enters the exhaust passage 108, thereby reducing the flow speed of the air outlet airflow, increasing the air outlet flow, and reducing the noise during air outlet.

[0050] And by arranging the maximum diameter D1 of the center disc 102 to be 1.01-1.3 times the diameter D2 of the hub 210 of the fan 220, the low-pressure backflow can be effectively blocked, the negative impact of the backflow on the work of the blades 221 can be reduced, the turbulence intensity at the root of the blades 221 can be reduced, the performance of the fan 220 can be improved, and the noise can be reduced. Moreover, the flow of high-pressure airflow will not be blocked due to the oversized center disc 102.

[0051] Those skilled in the art can understand that, although the air outlet mesh cover includes the above structural features in the present embodiment, the structures of the air outlet mesh cover can also be used alone.

[0052] FIG. 3 and FIG. 4 show cross-sectional views of two embodiments of the radial fins 104. FIG. 3 shows an embodiment in which the radial fins 304 have a cross-sectional shape of a circular arc with uniform thickness, and FIG. 4 shows an embodiment in which the radial fins 404 have a cross-sectional shape of an airfoil with non-uniform thickness. As shown in FIG. 3, the radial fins 304 have a radial fin top portion 314 and a radial fin bottom portion 313, and a pair of radial fin side walls 311a and 311b. The radial fin side wall 311a of each radial fin 304 and the radial fin side wall 311b of the adjacent radial fin 304 are spaced apart to form a portion of the exhaust passage 108. The pair of radial fin side walls 311a and 311b are smoothly connected, and the radial fin top portion 314 and the radial fin bottom portion 313 are smoothly connected, to reduce pressure loss of the airflow flowing therethrough.

[0053] Each radial fin 304 has a center line i about which the radial fin 304 is symmetrically arranged. The center line i of the radial fin top portion 314 is parallel to the axis x, and the center line i of the radial fin bottom portion 313 has an included angle θ with the axis x, the included angle θ being consistent with the air outlet angle of the blower 220. In this embodiment, the cross-sectional shape of the radial fin 304 is a circular arc with uniform thickness, and thus the pair of radial fin side walls 311a and 311b are substantially parallel and extend in a direction substantially consistent with the direction of the center line i. That is, the included angle between the bottom of the pair of radial fin side walls 311a and 311b and the axis x is substantially consistent with the air outlet angle of the blower 220.

[0054] As shown in FIG. 4, similar to the radial fins 304, the radial fins 404 have a radial fin top portion 414 and a radial fin bottom portion 413, and a pair of radial fin side walls 411a and 411b. The radial fin side wall 411a of each radial fin 404 and the radial fin side wall 411b of the adjacent radial fin 404 are spaced apart to form a portion of the exhaust passage 108. The pair of radial fin side walls 411a and 411b are smoothly connected, and the radial fin top portion 414 and the radial fin bottom portion 413 are smoothly connected, to reduce pressure loss of the airflow flowing therethrough.

[0055] Each radial fin 404 has a center line i, and the radial fin 404 is symmetrically arranged relative to the center line i. The center line i of the top of the radial fin 404 414 is parallel to the axis x, and the center line i of the bottom of the radial fin 404 413 has an included angle θ with the axis x, which is consistent with the air outlet angle of the fan 220. Unlike the radial fin 304, the cross-sectional shape of the radial fin 404 is not a circular arc with uniform thickness, but a wing shape with gradually increasing thickness from top to bottom. Therefore, a pair of radial fin side walls 411a and 411b gradually move away from the center line i from top to bottom. That is, the extension direction of each radial fin side wall 411a and 411b is not completely consistent with the direction of the center line i. In this embodiment, although the bottom of the radial fin side wall 411a and 411b is not completely consistent with the air outlet angle θ, the bottom of the radial fin side wall 411a and 411b is also inclined to extend along the air outlet direction, and can also play a role in converting the dynamic pressure of the airflow entering the exhaust passage 108 into static pressure.

[0056] Figs. 5A and 5B show the general structure of an air conditioner outdoor unit 550 including the air outlet screen 100 of the present application. Fig. 5A shows the external structure of the air conditioner outdoor unit 550, and Fig. 5B shows the structure of the air conditioner outdoor unit 550 after removing the air outlet screen 100 and the blade 221. As shown in Figs. 5A and 5B, the air conditioner outdoor unit 550 includes a housing 551 and the air outlet screen 100 connected to the housing 551. The housing 551 is a rectangular parallelepiped shape having a cavity 558 therein. The cavity 558 can accommodate the fan 220 and part of the equipment of the air conditioning system, such as a compressor, a condenser, etc. The cavity 558 forms an air outlet 556 on the front panel 552 of the housing 551, and the air outlet screen 100 covers the outside of the air outlet 556 and is connected to the front panel 552. The fan 220 is arranged inside the air outlet 556 to drive the gas in the cavity 558 to be discharged from the air outlet screen 100 after passing through the air outlet 556.

[0057] Figs. 6 and 7 show cross-sectional views of two embodiments of the air outlet screen, wherein the air outlet screen 600 and the air outlet screen 700 shown in Figs. 6 and 7 differ from the air outlet screen 100 in that the structure of the center disc is different. Specifically, as shown in Fig. 6, the center disc 602 is no longer a flat-bottomed pot shape, but a bowl shape. The disc bottom 631 of the center disc 602 is a round bottom shape, and the disc side 632 is a smooth circular arc shape. The top edge 635 of the disc side 632 defines a disc top opening 633. In this embodiment, the top edge 635 of the disc side 632 forms a maximum diameter, which is 1.01-1.3 times the hub diameter. A plurality of radial fins 604 are connected to the arc-shaped disc side 632. A plurality of circumferential fins 603 are arranged outside the top edge 635 around the disc top opening 633.

[0058] As shown in FIG. 7, the center disc 702 is also a bowl shape similar to the center disc 602, and has a disc bottom 731 in the shape of a round bottom and a disc side 732 in the shape of a smooth arc. The top edge 735 of the disc side 732 defines a disc top opening 733. In this embodiment, the top edge 735 of the disc side 732 is formed at a maximum diameter that is 1.01-1.3 times the diameter of the hub. A plurality of circumferential ribs 703 are arranged outside the top edge 735 around the disc top opening 733. Unlike the center disc 602, the center disc 702 further comprises a folded edge 737 that is folded downward from the top edge 735 of the disc side 732. A plurality of radial ribs 704 are connected to the folded edge 737 of the center disc 702.

[0059] Compared with the center disc 602, the vertically downwardly extending folded edge of the center disc 702 is more convenient for connection with the radial ribs, for example, by a processing technology such as welding, and the connection structure is also more stable. However, the arc-shaped wall is more conducive to guiding the flow of the air flow of the air inlet side 105. The connection strength of the disc side 232 of the center disc 102 of the pan shape to the radial ribs 104 is also good, and the disc side 232 can also guide the flow of the air flow of the air inlet side 105 well.

[0060] FIGS. 8A and 8B show the comparison of the outflow net cover 100 and the comparative outflow net cover under the same fan conditions, and the comparison of the turbulence intensity near the center disc. FIG. 8A shows the turbulence intensity near the center disc of the comparative outflow net cover, wherein the maximum diameter of the center disc of the comparative outflow net cover is smaller than the diameter of the hub. FIG. 8B shows the turbulence intensity near the center disc of the outflow net cover 100, wherein the maximum diameter D1 of the center disc 102 of the outflow net cover 100 is 1.01-1.3 times the diameter D2 of the hub 210. As shown in FIGS. 8A and 8B, the center disc 102 of the outflow net cover 100 can guide the flow of the high-pressure air flow through the disc side, and the turbulence intensity is obviously reduced compared with the comparative outflow net cover.

[0061] FIGS. 9A and 9B show the comparison of the outflow net cover 100 and the comparative outflow net cover under the same fan conditions, and the comparison of the backflow near the center disc. FIG. 9A shows the backflow near the center disc of the comparative outflow net cover, wherein the maximum diameter of the center disc of the comparative outflow net cover is smaller than the diameter of the hub. FIG. 9B shows the backflow near the center disc of the outflow net cover 100, wherein the maximum diameter D1 of the center disc 102 of the outflow net cover 100 is 1.01-1.3 times the diameter D2 of the hub 210. As shown in FIGS. 9A and 9B, the center disc 102 of the outflow net cover 100 can block the backflow of the low-pressure air flow through the disc top opening, so that the low-pressure backflow cannot affect the blades. Compared with the comparative outflow net cover, the outflow net cover 100 obviously reduces the low-pressure backflow.

[0062] In addition, the air outlet net cover 100 and the air outlet net cover of the comparative example are compared under the same fan condition, and the static pressure under the same air volume is obviously improved, and the sound pressure (reflecting the noise size) is obviously reduced.

[0063] FIGS. 10A and 10B show the structure of an air outlet net cover 1000 according to another embodiment of the present application. FIG. 10A is a perspective view of the air outlet net cover 1000, and FIG. 10B is a sectional view of the air outlet net cover 1000. As shown in FIGS. 10A and 10B, the air outlet net cover 1000 has an air inlet side 1005 and an air outlet side 1006 opposite to each other in the axial direction. A fan is connected below the air outlet net cover 1000, so that the air outlet net cover 1000 guides the airflow discharged from the fan to flow from the air inlet side 1005 to the air outlet side 1006.

[0064] The general structure of the air outlet net cover 1000 is the same as that of the air outlet net cover 100, and also includes a center disc 1002, a frame 1001, a plurality of radial ribs 1004, and a plurality of circumferential ribs 1003. The plurality of radial ribs 1004 are arranged radially from the center disc 1002 to the frame 1001. The plurality of circumferential ribs 1003 are arranged as concentric annular rings extending in the circumferential direction around the center disc 1002, and each circumferential rib 1003 is arranged at a distance from the adjacent circumferential rib 1003. Thus, the plurality of circumferential ribs 1003 and the plurality of radial ribs 1004 are arranged in a substantially grid shape. In this embodiment, the circumferential ribs 1003 and the radial ribs 1004 do not completely overlap in the axial direction. The radial ribs 1004 include a plurality of overlapping portions 1044, and the circumferential ribs 1003 overlap the radial ribs 1004 at each overlapping portion 1044. The axial height of each overlapping portion 1044 is substantially the same.

[0065] Unlike the air outlet net cover 100, in this embodiment, the radial ribs 1004 are no longer extended in the radial direction from the center disc 1002 to the frame 1001, but are inclined with respect to a plane perpendicular to the axial direction. As an example, the radial ribs 1004 are inclined to extend from the air inlet side 1005 toward the air outlet side 1006, or inclined to extend from the air outlet side 1006 toward the air inlet side 1005. Correspondingly, each circumferential rib 1003 is also arranged to be staggered in the axial direction. That is, in the direction from the center disc 1002 to the frame 1001, each circumferential rib 1003 is arranged to gradually move away from the fan or gradually move closer to the fan. In some embodiments, the line 1045 connecting the center points of each circumferential rib 103 can be a diagonal straight line, an arc, or a combination of a diagonal straight line and an arc, as long as the number of ribs in at least part of the axial cross section (i.e., the cross section perpendicular to the axial direction) is reduced compared to the number of the air outlet net cover 100.

[0066] Thus, the number of the circumferential ribs 1003 and / or the radial ribs 1004 is further reduced on the same axial section compared with the air outlet mesh 100, so that the number of the circumferential ribs 1003 and / or the radial ribs 1004 through which the airflow flows is less on the flow path of the airflow discharged from the fan, and thus the flow area of the airflow is further increased.

[0067] As a specific example, the plurality of circumferential ribs include an innermost circumferential rib 1003a and an outermost circumferential rib 1003b. The innermost circumferential rib 1003a is close to the center disc 1002, and the outermost circumferential rib 1003b is close to the frame 1001. The difference H0 in axial height between the innermost circumferential rib 1003a and the outermost circumferential rib 1003b is 0.6-0.95 of the total axial height H1 of the air outlet mesh 1000. The inclination angle of the connecting line of the center lines of the innermost circumferential rib 1003a and the outermost circumferential rib 1003b relative to the axial section can be set according to specific needs. The smaller the inclination angle, the smaller the overall axial height of the air outlet mesh 1000, and the larger the inclination angle, the larger the flow area of the airflow. The maximum inclination angle is determined by the size limitation of the air conditioner outdoor unit, and a suitable inclination angle can be obtained by those skilled in the art according to the specific size requirements of the air conditioner outdoor unit.

[0068] Thus, in this embodiment, the air outlet mesh 1000 improves the air outlet area in three-dimensional space, and can have a larger flow area of the airflow, a lower airflow velocity, and a lower turbulence intensity compared with the air outlet mesh 100.

[0069] The air outlet mesh of the present application can effectively block the low-pressure backflow by making the maximum diameter of the center disc 1.01-1.3 times the diameter of the hub of the fan, so as to reduce the negative impact of the low-pressure backflow on the work of the blades. And by guiding the high-pressure airflow to flow out, the turbulence intensity at the root of the blade can be reduced. Thus, the performance of the fan is improved while the noise is reduced. And the size of the center disc is not too large to block the flow of the high-pressure airflow. The air outlet mesh of the present application increases the size of the center disc, but not only does not block the flow of the airflow, but also improves the performance of the fan.

[0070] While the present disclosure has been described in connection with the illustrative examples described above, various alternative, modifications, variations, improvements, and / or substantial equivalents that are or can be presently unforeseeable can be made by persons skilled in the art with the benefit of the present disclosure. Therefore, the presently disclosed examples are intended to be illustrative only and not limiting. Various changes can be made without departing from the spirit or scope of the present disclosure. Accordingly, the presently disclosed examples are intended to be illustrative only and not limiting. The technical effects and technical problems described in this specification are exemplary and not limiting. It should be noted that the embodiments described in this specification can have other technical effects and can address other technical problems.

Claims

1. An air outlet mesh cover, the air outlet mesh cover (100) is used to be connected on the outside of a fan (220) to guide the air outlet direction of the fan (220), characterized in that The air outlet grille (100) comprises: a center disc (102) disposed in the middle of the air outlet grille (100); a frame (101) disposed at the outer edge of the air outlet grille (100); and a plurality of radial ribs (104) radially arranged from the center disc (102) to the frame (101), and each of the radial ribs (104) is connected between the center disc (102) and the frame (101), wherein the air outlet grille (100) has an air outlet side (106) and an air inlet side (105), and the air outlet grille (100) is arranged to guide the airflow discharged from the fan (220) to flow from the air inlet side (105) to the air outlet side (106). The maximum diameter (D1) of the center disc (102) of the air outlet grille (100) is set to be 1.01-1.3 times the diameter (D2) of the hub (210) of the fan (220).

2. The air outlet grille according to claim 1, wherein: The air outlet grille (100) has an air outlet side (106) and an air inlet side (105), and the air outlet grille (100) is arranged to guide the airflow discharged from the fan (220) to flow from the air inlet side (105) to the air outlet side (106). The center disc (102) comprises oppositely arranged disc bottom (231) and disc top opening (233), the disc bottom (231) faces the air inlet side (105), the disc top opening (233) faces the air outlet side (106), wherein the center disc (102) further comprises a disc side (232) surrounding the disc bottom (231), the disc side (232) extends from the disc bottom (231) towards the air outlet side (106), and the top edge (235) of the disc side (232) defines the disc top opening (233).

3. The air outlet grille according to claim 2, wherein: The disc side (232) extends upward and outward in the direction towards the air outlet side (106) to form a maximum diameter at the top edge (235) of the disc side (232).

4. The air outlet grille according to claim 3, wherein: The disc side (232) is a streamline shape, and the disc side (232) is smoothly connected with the disc bottom (231).

5. The air outlet grille according to claim 4, wherein: The center disc (102) is a flat-bottomed pan shape, wherein the disc bottom (231) is a flat plate shape, and the disc side (232) is a smooth arc shape, and the radial rib (104) is connected to the disc side (232).

6. The air outlet grille according to claim 4, wherein: The center disc (602, 702) is a bowl shape, wherein the disc bottom (631, 731) is a round bottom shape, and the disc side (632, 732) is a smooth arc shape.

7. The air outlet mesh shroud of claim 6, wherein: the center disc (702) further comprises a turned down edge (737) turned down from a top edge (735) of the disc side (732), wherein the radial ribs (704) are connected to the turned down edge (737).

8. The air outlet mesh shroud of claim 1, wherein: the air outlet mesh shroud (100) further comprises a plurality of circumferential ribs (103), each of the circumferential ribs (103) being a concentric ring around the center disc (102), and the plurality of circumferential ribs (103) are spaced apart, each of the circumferential ribs (103) being connected to at least a portion of the plurality of radial ribs (104).

9. The air outlet mesh shroud of claim 8, wherein: the air outlet mesh shroud (100) has an axial direction, in the axial direction of the air outlet mesh shroud (100), the circumferential ribs (103) and the radial ribs (104) are arranged in layers such that the circumferential ribs (103) and the radial ribs (104) partially overlap, wherein the circumferential ribs (103) extend in the axial direction.

10. The air outlet mesh shroud of claim 1, wherein: the air outlet mesh shroud (100) has an exhaust passage (108) defined at least partially between adjacent radial ribs (104), the exhaust passage (108) is configured to guide airflow discharged from the fan (220) to flow through the exhaust passage (108) from the air inlet side (105) to the air outlet side (106); wherein the radial ribs (104) are configured such that the exhaust passage (108) extends obliquely along a discharge direction of the fan (220) at the air inlet side (105).

11. An air conditioner outdoor unit characterized by comprising: a fan (220); and the air outlet mesh shroud (100) of any one of claims 1-10; wherein the air outlet mesh shroud (100) is connected to an outer side of the fan (220) to guide airflow discharged from the fan (220) to flow from the air inlet side (105) to the air outlet side (106).

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