Air conditioner

Abstract

Some embodiments of the present disclosure provide air conditioners, the air conditioners each comprising an outdoor unit. The outdoor unit comprises a housing, a fan, and an air outlet mesh. The housing comprises an air passage opening and an accommodating cavity. The fan is arranged in the accommodating cavity and is arranged corresponding to the air passage opening. The air outlet mesh comprises a positioning portion, a supporting portion, and a mesh. The positioning portion extends in the circumferential direction of the edge of the air outlet mesh. The supporting portion is arranged as coaxial with the air outlet mesh and is configured to support the air outlet mesh. The mesh comprises at least one connecting portion, at least one first mesh strip, and at least one second mesh strip. One end of the at least one connecting portion is connected to the supporting portion, and the other end thereof is oriented towards the positioning portion and extends in the radial direction of the air outlet mesh. The at least one first mesh strip is arranged between the positioning portion and the supporting portion. The at least one second mesh strip is arranged between the positioning portion and the supporting portion; and in the axial direction of the air outlet grid, the at least one second mesh strip is arranged at the side of the at least one first mesh strip close to the fan and is spaced apart from the at least one first mesh strip.

Description

air conditioner

[0001] This application claims priority to Chinese patent application No. 202311431001.7, filed on October 30, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present disclosure relates to the technical field of air conditioning, and in particular to an air conditioner. Background Art

[0003] The air conditioner mainly consists of an outdoor unit and an indoor unit. An air outlet grille is provided at the air outlet of the outdoor unit. The air outlet grille is mainly used to prevent external debris from entering the outdoor unit and affecting the normal operation of the outdoor unit, and to prevent users from directly contacting the fan in the outdoor unit and causing accidents. In addition, the wind generated by the fan in the outdoor unit needs to pass through the air outlet grille to reach the outdoors.

[0004] Summary of the Invention

[0005] An air conditioner is provided, comprising an indoor unit and an outdoor unit. The outdoor unit comprises a casing, a fan, and an air outlet grille. The casing comprises a vent and a accommodating chamber, wherein the vent is connected to the accommodating chamber. The fan is disposed in the accommodating chamber and is arranged corresponding to the vent. The air outlet grille comprises a positioning portion, a supporting portion, and a grille mesh. The positioning portion is disposed at an edge of the air outlet grille and extends circumferentially along the edge of the air outlet grille, is connected to the casing, and is arranged close to the vent. The supporting portion is coaxially disposed with the air outlet grille and is configured to support the air outlet grille. The grille mesh comprises at least one connecting portion, at least one first bar, and at least one second bar. One end of the at least one connecting portion is connected to the supporting portion, and the other end faces the positioning portion and extends radially along the air outlet grille. The at least one first bar is disposed between the positioning portion and the supporting portion. The at least one second bar is arranged between the positioning portion and the supporting portion; along the axial direction of the air outlet grille, the at least one second bar is arranged on the side of the at least one first bar close to the fan, and is spaced apart from the at least one first bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] FIG1 is a structural diagram of an air conditioner according to some embodiments;

[0007] FIG2 is a structural diagram of an outdoor unit according to some embodiments;

[0008] FIG3 is a structural diagram of an air outlet grille according to some embodiments;

[0009] FIG4 is a cross-sectional view of an air outlet grille according to some embodiments;

[0010] FIG5 is a partial enlarged view of the circle B in FIG4 ;

[0011] FIG6 is a partial enlarged view of the circle C in FIG4 ;

[0012] FIG7 is a partial enlarged view of circle D in FIG4 ;

[0013] FIG8 is a partial enlarged view of circle E in FIG4 ;

[0014] FIG9 is a wind field simulation diagram of an air outlet grille according to some embodiments;

[0015] FIG10 is a wind field simulation diagram of another air outlet grille according to some embodiments;

[0016] FIG11 is a partial structural diagram of a grid mesh according to some embodiments;

[0017] FIG12 is a line graph showing the relationship between air volume and noise in the second and first groups of outdoor units according to some embodiments;

[0018] FIG13 is a structural diagram of another air outlet grille according to some embodiments;

[0019] FIG14 is a cross-sectional view of another air outlet grille according to some embodiments;

[0020] FIG15 is a partial enlarged view of circle F in FIG14 ;

[0021] FIG16 is another structural diagram of yet another air outlet grille according to some embodiments;

[0022] FIG17 is another structural diagram of another air outlet grille according to some embodiments;

[0023] FIG18 is another structural diagram of another air outlet grille according to some embodiments;

[0024] FIG19 is a partial structural diagram of another air outlet grille according to some embodiments;

[0025] FIG20 is a partial enlarged view of the circle G in FIG14 ;

[0026] FIG21 is a simulation effect diagram of the resistance of an air outlet grille to airflow according to some embodiments;

[0027] FIG22 is another simulation effect diagram of the resistance of an air outlet grille to airflow according to some embodiments;

[0028] FIG23 is another simulation effect diagram of the resistance of an air outlet grille to airflow according to some embodiments;

[0029] FIG24 is another simulation effect diagram of the resistance of an air outlet grille to airflow according to some embodiments;

[0030] FIG25 is another partial structural diagram of yet another air outlet grille according to some embodiments;

[0031] FIG26 is a partial enlarged view of circle I in FIG25;

[0032] FIG27 is another partial structural diagram of another air outlet grille according to some embodiments;

[0033] FIG28 is another simulation effect diagram of the resistance of an air outlet grille to airflow according to some embodiments;

[0034] FIG29 is another simulation effect diagram of the resistance of an air outlet grille to airflow according to some embodiments;

[0035] FIG30 is a partial structural diagram of another outdoor unit according to some embodiments;

[0036] FIG31 is a partial enlarged view of circle J in FIG30 ;

[0037] FIG32 is a line chart showing the effect of the ratio of the minimum radial dimension to the third dimension of the positioning portion on the air volume at the same rotation speed according to some embodiments. DETAILED DESCRIPTION

[0038] The following will be combined with the accompanying drawings to clearly and completely describe some embodiments of the present disclosure. Obviously, the embodiments described are only some embodiments of the present disclosure, rather than all embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present disclosure.

[0039] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and its other forms, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open and inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to indicate that the particular features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the particular features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0040] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0041] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. The term "connected" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. The term "coupled" indicates, for example, that two or more components are in direct physical or electrical contact. The term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0042] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0043] The use of "adapted to" or "configured to" herein is intended to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0044] Air conditioners are a common household appliance widely used in daily life. Air conditioners include an outdoor unit and an indoor unit. The indoor air temperature is regulated through the cooperation between the outdoor unit and the indoor unit.

[0045] As shown in FIG. 1 , in some embodiments, an air conditioner 100 includes an outdoor unit 200 .

[0046] The outdoor unit 200 includes an outdoor heat exchanger, which serves as an evaporator or a condenser in the refrigerant cycle of the air conditioner 100 and exchanges heat with outdoor air during the refrigerant circulation process.

[0047] The outdoor unit 200 further includes a compressor configured to compress a low-temperature, low-pressure gas-phase refrigerant into a high-temperature, high-pressure gas-phase refrigerant to assist the air conditioner 100 in performing refrigerant circulation.

[0048] In some embodiments, the air conditioner 100 further includes an expansion valve configured to adjust a flow rate of refrigerant in a pipeline of the air conditioner 100 .

[0049] In some embodiments, the air conditioner 100 further includes an indoor unit 300. The indoor unit 300 includes an indoor heat exchanger, which serves as a condenser or an evaporator in the refrigerant cycle of the air conditioner 100 and exchanges heat with the indoor air during the refrigerant circulation process.

[0050] The refrigerant cycle of the air conditioner 100 is performed by a compressor, a condenser (an indoor heat exchanger or an outdoor heat exchanger), an expansion valve (an indoor expansion valve and an outdoor expansion valve), and an evaporator (an outdoor heat exchanger or an indoor heat exchanger). The refrigerant cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and circulates the refrigerant to the conditioned side.

[0051] When the air conditioner 100 is operating in heating mode, the low-temperature, low-pressure gas-phase refrigerant is compressed by the compressor into a high-temperature, high-pressure gas-phase refrigerant, which then flows into the indoor heat exchanger. The indoor heat exchanger condenses the high-temperature, high-pressure gas-phase refrigerant into a high-pressure liquid-phase refrigerant. Heat is released into the surrounding environment during the condensation process, thereby increasing the temperature of the indoor air. The expansion valve throttles and reduces the pressure of the high-pressure liquid-phase refrigerant, converting it into a low-pressure gas-liquid two-phase refrigerant. The outdoor heat exchanger evaporates the low-pressure gas-liquid two-phase refrigerant to form a low-temperature, low-pressure gas-phase refrigerant, which then returns to the compressor, completing the heating cycle.

[0052] When the air conditioner 100 is operating in cooling mode, the high-temperature, high-pressure gaseous refrigerant discharged from the compressor flows into the outdoor heat exchanger. The outdoor heat exchanger condenses the high-temperature, high-pressure gaseous refrigerant into a medium-temperature, high-pressure, subcooled liquid refrigerant. The expansion valve throttles and reduces the pressure of the medium-temperature, high-pressure, subcooled liquid refrigerant into a low-temperature, low-pressure, gas-liquid two-phase refrigerant. The indoor heat exchanger evaporates the low-temperature, low-pressure gas-liquid two-phase refrigerant to form a low-temperature, low-pressure gaseous refrigerant. The evaporation process absorbs heat from the surrounding environment, lowering the indoor air temperature. The low-temperature, low-pressure gaseous refrigerant returns to the compressor, completing the refrigeration cycle.

[0053] In some embodiments, the outdoor unit includes an air outlet grille and a fan. Air heated in the outdoor unit forms an airflow, which is blown by the fan through the air outlet grille and into the outdoor environment. The air outlet grille prevents foreign matter from entering the outdoor unit and potentially affecting its normal operation. It also prevents direct contact between the user and the outdoor fan, improving the safety of the outdoor unit.

[0054] Usually, in order to reduce production costs, the material of the air outlet grille of the outdoor unit is plastic, for example. The rib parameters of the air outlet grille made of plastic, for example, at least one of the height, thickness or length of the ribs will be limited by the molding process, resulting in the air outlet volume of the air outlet grille being limited, that is, the air outlet grille will produce greater resistance to the wind blown out by the fan. At this time, if the air volume requirement is to be met, the fan speed needs to be increased. However, this will increase the power of the fan, resulting in an increase in the operating cost of the fan and a reduction in the energy efficiency ratio of the air conditioner.

[0055] In related art, the resistance of the air outlet grille to the air blown out of the fan is typically reduced by adjusting the radial or circumferential gaps between the grille's ribs. However, the gap width between the grille bars must meet relevant standards. For example, the gaps between the grille ribs must be smaller than a preset size to improve the reliability of the outdoor unit. Therefore, this approach cannot effectively solve the problem of the air outlet grille's significant resistance to the air blown out of the fan.

[0056] To solve the above problems, the present disclosure provides an outdoor unit 20. As shown in FIG2 , in some embodiments, the outdoor unit 20 includes a housing 1 that encloses a housing 11. An outdoor heat exchanger of the outdoor unit 20 is disposed in the housing 11.

[0057] The housing 1 includes a side wall 111. The side wall 111 includes four sub-side walls.

[0058] The housing 1 further includes a top wall 112 , which is connected to, for example, four sub-side walls.

[0059] The housing 1 further includes a vent 12, which is, for example, disposed on one of the four side walls, or further, on the top wall 112. The vent 12 connects the accommodating cavity 11 with the external structure.

[0060] The casing 1 also includes an air inlet. When the air vent 12 is arranged on one of the four sub-side walls, the air inlet is, for example, arranged on at least one of the other three sub-side walls; when the air vent 12 is arranged on the top wall 112, the air inlet is, for example, arranged on at least one of the four sub-side walls.

[0061] In some embodiments, the outdoor unit 20 further includes a fan 2, which is located within the accommodating chamber 11 and is disposed corresponding to the vent 12. For example, the air outlet side of the fan 2 is disposed toward the vent 12 to drive air to flow through the air inlet, the accommodating chamber 11, and the vent 12. In this way, the air flowing into the accommodating chamber 11 can fully exchange heat with the outdoor heat exchanger, and the heat-exchanged air is discharged from the accommodating chamber 11 through the vent 12.

[0062] In some embodiments, as shown in Figure 2, the fan 2 includes a motor 21, which is arranged in the accommodating cavity and connected to the casing 1. For example, the motor 21 can be fixedly installed on the side of the sub-side wall corresponding to the vent 12 in the side wall 111 facing the accommodating cavity 11 by fasteners.

[0063] As shown in FIG2 , the fan 2 further includes at least one blade 22, which is connected to the motor 21 and spaced apart along the axial direction of the motor 21. The motor 21 is configured to drive the at least one blade 22 to rotate. In some embodiments, the at least one blade 22 is disposed corresponding to the vent 12.

[0064] It is understandable that outdoor air is composed of a large number of particles (such as various gas molecules, dust, etc.), and a large number of particles are suspended in the air. In the absence of external force, a large number of particles are moving freely in the air.

[0065] In some embodiments, when the fan 20 is running, at least one blade 22 rotates along the axis of the motor 21 and strikes particles in the air. The struck particles are transformed from free motion to rapid movement in a preset direction, thereby generating airflow.

[0066] The air in front of at least one fan blade 22 (for example, the side of the fan blade 22 facing the vent) is continuously blown away and blown out of the outdoor unit after passing through the vent 12, thereby forming a low-pressure area in front of at least one fan blade 22. At this time, a pressure difference is formed between the front of at least one fan blade 22 and the rear thereof (for example, the side of the fan blade 22 away from the vent). Under the action of the pressure difference, the air behind at least one fan blade 22 will flow toward its front.

[0067] Since at least one fan blade 22 continues to rotate, at least one fan blade 22 will send out the air in front of it again, and the air behind at least one fan blade 22 will flow to the front of it again, and so on, forming a continuous airflow.

[0068] 2 , the outdoor unit 20 further includes an air outlet grille 3 . The air outlet grille 3 is disposed at the vent 12 and is configured to cover the vent 12 . When the air outlet grille 3 covers the vent 12 , the air outlet grille 3 is connected to the housing 1 .

[0069] In some embodiments, as shown in Figures 3 and 4 , the air outlet grille 3 includes a positioning portion 31 that extends circumferentially along the edge of the air outlet grille 3 and is connected to a portion of the housing 1 near the vent 12. The positioning portion 31 is detachably disposed on a side of the housing 1 near the vent 12, for example, using fasteners or a snap-fit ​​connection. The positioning portion 31 is configured to support and secure the air outlet grille 3.

[0070] In some embodiments, as shown in FIG. 3 and FIG. 4 , the air outlet grille 3 further includes a support portion 32 , which is coaxially disposed with the air outlet grille and configured to cooperate with the positioning portion 31 to support and fix the air outlet grille 3 .

[0071] It should be noted that the shape of the positioning portion 31 is, for example, at least one of a circular ring, an elliptical ring, and a rectangular ring. If the positioning portion 31 is a circular ring, its center is the center of the circular ring, and in this case, the support portion 32 is positioned near the center of the positioning portion 31. If the positioning portion 31 is an elliptical ring, its center is the center of the elliptical ring, and in this case, the support portion 32 is positioned near the center of the positioning portion 31. If the positioning portion 31 is a rectangular ring, its center is the intersection of two diagonals of the rectangular ring, and in this case, the support portion 32 is positioned near the intersection of the diagonals of the positioning portion 31.

[0072] In some embodiments, as shown in Figures 3 and 4 , the air outlet grille 3 further includes a grille mesh 33 including a plurality of bars. The grille mesh 33 is disposed between the positioning portion 31 and the support portion 32 , for example, the grille mesh 33 connects the positioning portion 31 and the support portion 32 .

[0073] In other embodiments, the support portion 32 and the grille net 33 are integrally formed, and in this case, the grille net 33 is connected to the positioning portion 31. In this way, the structure of the air outlet grille 3 is simple and easy to manufacture.

[0074] In some embodiments, as shown in FIG5 , the grille mesh 33 includes at least one connecting portion 331. One end of the at least one connecting portion 331 is connected to the support portion 32, and the other end extends radially toward the positioning portion 31. When the at least one connecting portion 331 includes a plurality of connecting portions 331, the plurality of connecting portions 331 are spaced apart along the circumference of the support portion 32. The at least one connecting portion 331 is, for example, a strip-shaped structure.

[0075] As shown in Figure 5, the plane perpendicular to the air outlet grille 3 is defined as the Y direction, then the axis of the air outlet grille 3 is, for example, parallel to the Y direction; the axis of the motor 21 and the axis of at least one fan blade 22 are, for example, collinear, and the axis is parallel to the Y direction; the axis of the vent 12 is, for example, parallel to the Y direction.

[0076] In some embodiments, as shown in FIG5 , the grille mesh 33 further includes at least one first bar 332, which is disposed between the positioning portion 31 and the support portion 32. When the at least one first bar 332 includes a plurality of first bars 332, the plurality of first bars 332 are spaced apart along the radial direction of the air outlet grille 3. The plurality of first bars 332 are cross-connected with at least a portion of the at least one connecting portion 331 to form a bar layer of the grille mesh 33 away from the fan 2.

[0077] In some embodiments, as shown in FIG5 , the grille mesh 33 further includes at least one second bar 333, which is disposed between the positioning portion 31 and the support portion 32. The at least one second bar 333 extends radially from a side proximal to the support portion 32. If the at least one second bar 333 includes a plurality of second bars 333, the plurality of second bars 333 are spaced apart radially along the positioning portion 31. The plurality of second bars 333 are cross-connected with at least a portion of the at least one connection portion 331 to form a bar layer of the grille mesh 33 proximal to the fan 2.

[0078] In some embodiments, the grille mesh 33 includes multiple layers of bars, and the multiple layers of bars are spaced apart along the axial direction of the air outlet grille 3. For example, as shown in FIG5 , the air outlet grille 3 includes two layers of bars, and the two layers of bars are spaced apart along the axial direction of the air outlet grille 3. That is, along the axial direction of the air outlet grille 3, the second bars 333 are located on the side of the first bars 332 closer to the fan 2 and are spaced apart from the first bars.

[0079] According to the wind field simulation diagram shown in Figure 10, it can be seen that when the air outlet grille 3 includes two grid bar layers arranged at axial intervals along the positioning portion 31, the air outlet grille 3 can maintain the wind resistance of the positioning portion 31 unchanged or reduce the wind resistance, and can also reduce the area of ​​the low-speed vortex zone at the air outlet side of the grille mesh 33 (for example, the air outlet side of the grille mesh 33 away from the installation cavity in the multi-layer grille mesh 33) to facilitate airflow through the air outlet grille 3, reduce the wind resistance and aerodynamic noise at the air outlet grille 3, and improve the air outlet efficiency of the outdoor unit 20.

[0080] It will be appreciated that the air outlet grille 3 comprises multiple layers of bars spaced axially along the positioning portion 31. This allows the airflow to undergo multiple separations and reattaches as it passes through the air outlet grille 3. For example, after passing through the second bars 333, the airflow partially separates, then attaches to the surface of the first bars 332 and separates again after passing through the first bars 332. This ensures that the thickness of the boundary layer attached to the bar walls of the grille 33 remains within a predetermined range. This reduces frictional resistance between the airflow and the bars and prolongs the time the airflow remains attached to the bar walls of the multi-layered grille 33, delaying the deceleration caused by fluid separation and facilitating reduced wind resistance and aerodynamic noise at the outlet grille 33. Furthermore, some airflow accelerates as it passes through the gaps between the second bars 333 and the first bars 332, increasing the airflow velocity, improving the airflow efficiency at the outlet grille 33, and reducing wind resistance at the outlet grille 33.

[0081] It should be noted that the side of the air outlet grille 3 away from the fan 2 is the air outlet side, and the side of the air outlet grille 3 close to the fan 2 is the air inlet side.

[0082] In other embodiments, the grille mesh 33 includes a bar layer, that is, a plurality of bars are connected in a preset manner on the same plane to form the grille mesh 33. In this case, according to the wind field simulation diagram shown in FIG9 , when the airflow passes through the air outlet grille 3, severe flow separation will occur on the air outlet side of the air outlet grille 3, resulting in the formation of a low-speed vortex zone larger than a preset area at the grille mesh 33. For example, a low-speed vortex zone is formed on the air outlet side of the grille mesh 33 near the support portion 32, and a low-speed vortex zone is formed on the air inlet side, the air outlet side, and the area between two adjacent ribs of the grille mesh 33 near the positioning portion 31, thereby increasing the aerodynamic resistance at the grille mesh 33, that is, the wind resistance at the grille mesh 33 is large and the wind speed is low, thereby reducing the air outlet efficiency of the outdoor unit 20. In addition, the low-speed vortex zone will also increase the turbulent kinetic energy at the grille mesh 33, resulting in increased aerodynamic noise.

[0083] 5 , the plurality of second bars 333 may include at least one first sub-bar 3331, at least one second sub-bar 3332, and at least one third sub-bar 3333. The at least one first sub-bar 3331, the at least one third sub-bar 3333, and the at least one second sub-bar 3332 are sequentially spaced apart along the radial direction of the air outlet grille 3.

[0084] In some embodiments, when at least one first sub-bar 3331 includes multiple first sub-bars 3331, the multiple first sub-bars 3331 are arranged close to the positioning portion 31 and are arranged at radial intervals along the air outlet grille 3; when at least one second sub-bar 3332 includes multiple second sub-bars 3332, the multiple second sub-bars 3332 are arranged close to the supporting portion 32 and are arranged at radial intervals along the air outlet grille 3; when at least one third sub-bar 3333 includes multiple third sub-bars 3333, the multiple third sub-bars 3333 are arranged between the first sub-bar 3331 and the second sub-bar 3332, and are arranged at radial intervals along the air outlet grille 3.

[0085] In some embodiments, the plurality of first bars 332 may include at least one fourth sub-bar 3321, at least one fifth sub-bar 3322, and at least one sixth sub-bar 3323, and the at least one fourth sub-bar 3321, at least one fifth sub-bar 3322, and at least one sixth sub-bar 3323 are spaced apart in sequence along the radial direction of the air outlet grille 3.

[0086] In some embodiments, when at least one fourth sub-bar 3321 includes multiple fourth sub-bars 3321, the multiple fourth sub-bars 3321 are arranged close to the positioning portion 31 and are arranged radially along the air outlet grille 3; when at least one fifth sub-bar 3322 includes multiple fifth sub-bars 3322, the multiple fifth sub-bars 3322 are arranged close to the supporting portion 32 and are arranged at intervals along the radial direction of the air outlet grille 3; when at least one sixth sub-bar 3323 includes multiple sixth sub-bars 3323, the multiple sixth sub-bars 3323 are arranged between the fourth sub-bar 3321 and the fifth sub-bar 3322, and are arranged at intervals along the radial direction of the air outlet grille 3.

[0087] In some embodiments, when the positioning portion 31 is shaped like a circular ring, the plurality of first sub-bars 3331 are, for example, a plurality of concentric circular ring structures with radii increasing successively along the radial outward direction of the air outlet grille 3 (i.e., in the direction from the support portion 32 to the positioning portion 31); the plurality of third sub-bars 3333 are, for example, a plurality of concentric circular ring structures with radii increasing successively along the radial outward direction of the air outlet grille 3; the plurality of second sub-bars 3332 are, for example, a plurality of concentric circular ring structures with radii increasing successively along the radial outward direction of the air outlet grille 3.

[0088] It should be noted that different second bars 333 have different deflection angles relative to the axis of the positioning portion 31 .

[0089] In some embodiments, as shown in FIG5 and FIG6, the angle between the line between the end of at least one first sub-bar 3331 away from the fan 2 and the end thereof close to the fan 2 and the axis of the air outlet grille 3 is a first inner angle α1.

[0090] In some embodiments, as shown in FIG5 and FIG7, the angle between the line between the end of at least one second sub-bar 3332 away from the fan 2 and the end thereof close to the fan 2 and the axis of the air outlet grille 3 is a second inner angle α2.

[0091] In some embodiments, as shown in Figures 5 and 8, at least one third sub-bar 3333 extends axially along the air outlet grille 3, that is, the line between the end of the third sub-bar 3333 away from the fan 2 and the end thereof close to the fan 2 is parallel to the axis of the air outlet grille 3.

[0092] In the process of the fan 2 blowing the airflow out of the accommodating cavity 11 along the Y direction from the vent 12, between the positioning portion 31 and the supporting portion 32 of the air outlet grille 3, under the influence of at least one first sub-bar 3331, the airflow in the area close to the supporting portion 32 will flow toward the direction of the axis close to the positioning portion 31; under the influence of at least one second sub-bar 3332, the airflow in the area close to the positioning portion 31 will flow toward the direction of the axis away from the positioning portion 31; under the influence of at least one third sub-bar 3333, part of the airflow in the area between the above two areas will flow parallel to the Y direction.

[0093] In this way, the second bars 333 can be arranged at the corresponding position along the flow direction of the airflow, so that when the airflow flows through the gap between two adjacent second bars 333, its flow direction can be consistent with the extension direction of the gap between the adjacent second bars 333, thereby reducing the wind resistance at the air outlet grille 3 and improving the air volume and air outlet efficiency at the air outlet grille 3.

[0094] In some embodiments, for at least one of first sub-bar 3331, second sub-bar 3332, or third sub-bar 3333, the size of the side of second bar 333 closer to the air inlet side decreases from the air outlet side to the air inlet side along the radial direction of air outlet grille 3. This can reduce the wind resistance of second bar 333 on the air inlet side and increase the speed of air flowing outward along the sidewalls of second bar 333.

[0095] In some embodiments, for at least one of the fourth sub-bar 3321, the fifth sub-bar 3322, and the sixth sub-bar 3323, the size of the side of the first bar 332 closer to the air inlet side decreases from the air outlet side to the air inlet side along the radial direction of the air outlet grille 3. This can reduce the wind resistance of the first bar 332 on the air inlet side and increase the speed of air flowing outward along the sidewall of the first bar 332.

[0096] In other embodiments, along the radial direction of the air outlet grille 3, the dimensions of the first and second bars 332, 333 on the side closest to the air outlet increase from the air outlet side to the air inlet side. This allows the airflow to adhere to the sidewalls of the first and second bars 332, 333, thereby increasing the airflow velocity.

[0097] In some embodiments, as shown in Figures 5 and 6, along the axial direction of the air outlet grille 3, at least one fourth sub-bar 3321 points from its side away from the fan 2 to its side close to the fan 2, and the angle between it and the axial direction of the air outlet grille 3 is a first external angle β1.

[0098] In some embodiments, as shown in FIG5 and FIG7, at least one fifth sub-bar 3322 points from its side away from the fan 2 to its side close to the fan 2, and the angle between it and the axial direction of the air outlet grille 3 is a second external angle β2.

[0099] In some embodiments, multiple first bars 332 and multiple second bars 333 can be arranged correspondingly in the Y direction. For example, at least one first sub-bar and at least one fourth sub-bar can be arranged correspondingly. Along the radial direction of the air outlet grille 3, at least one first bar 332 is arranged between every two adjacent second bars 333. This can reduce wind resistance and aerodynamic noise at the air outlet grille 3 and improve the air outlet efficiency of the air outlet grille 3.

[0100] In some embodiments, along the axial direction of the positioning portion 31, the ratio of the corresponding first outer angle β1 to the first inner angle α1 is in the range of [0.2, 1.0]. Within this range, as the ratio increases, the airflow deflection angle of the at least one first grating bar 332 and the at least one second grating bar 333 increases, and conversely, as the ratio decreases, the airflow deflection angle of the at least one first grating bar 332 and the at least one second grating bar 333 decreases.

[0101] In some embodiments, the ratio of the corresponding first outer angle β1 to the first inner angle α1 is in the range of [0.4, 0.5]. For example, the ratio of the corresponding first outer angle β1 to the first inner angle α1 is 0.4, 0.45, and 0.5.

[0102] In other embodiments, the ratio of the corresponding first outer angle β1 to the first inner angle α1 is in the range of [0.5, 0.6]. For example, the ratio of the corresponding first outer angle β1 to the first inner angle α1 is 0.5, 0.55, and 0.6.

[0103] In some other embodiments, the ratio of the corresponding first outer angle β1 to the first inner angle α1 is in the range of [0.6, 1.0]. For example, the ratio of the corresponding first outer angle β1 to the first inner angle α1 is 0.6, 0.7, 0.8, 0.9, and 1.0.

[0104] At this time, the angle of the first outer angle β1 is smaller than the angle of the first inner angle α1, so that the airflow can flow through the gap between the two adjacent fourth sub-bars 3321. The flow direction of the airflow can also be corrected by the fourth sub-bars 3321, so that after the airflow flows out from the grille 33, the angle between the flow direction and the Y direction is smaller or parallel to the Y direction, thereby increasing the air supply distance of the outdoor unit 20 and reducing the wind resistance.

[0105] It should be noted that if the ratio of the corresponding first outer angle β1 to the first inner angle α1 is determined to be less than 0.4, the air outlet grille 3 will have a greater wind resistance to the airflow. If the ratio of the corresponding first outer angle β1 to the first inner angle α1 is determined to be greater than 0.6, the air supply distance of the air outlet grille 3 will be reduced.

[0106] In some other embodiments, the first outer angle β1 is equal to the first inner angle α1. In this way, the wind resistance at the grille 33 can be reduced, and the air output of the outdoor unit 20 can be further increased.

[0107] In some embodiments, along the axial direction of the positioning portion 31, the ratio of the corresponding second outer angle β2 to the second inner angle α2 is in the range of [0.2, 1.0]. Within this range, as the ratio increases, the airflow deflection angle of the at least one first grating bar 332 and the at least one second grating bar 333 increases, and conversely, as the ratio decreases, the airflow deflection angle of the at least one first grating bar 332 and the at least one second grating bar 333 decreases.

[0108] In some embodiments, the ratio of the corresponding second outer angle β2 to the second inner angle α2 is in the range of [0.4, 0.5]. For example, the ratio of the corresponding second outer angle β2 to the second inner angle α2 is 0.4, 0.45, and 0.5.

[0109] In other embodiments, the ratio of the corresponding second outer angle β2 to the second inner angle α2 is in the range of [0.5, 0.6], and the corresponding ratios of the second outer angle β2 to the second inner angle α2 are 0.5, 0.55, and 0.6.

[0110] In some other embodiments, the ratio of the corresponding second outer angle β2 to the second inner angle α2 is in the range of [0.6, 1.0]. For example, the ratio of the corresponding second outer angle β2 to the second inner angle α2 is 0.6, 0.7, 0.8, 0.9, and 1.0.

[0111] At this time, the angle of the second outer angle β2 is smaller than the angle of the second inner angle α2, so that the airflow can flow through the gap between the two adjacent fifth sub-bars 3322. The flow direction of the airflow can also be corrected by the fifth sub-bars 3322, so that after the airflow flows out from the grille 33, the angle between the flow direction and the Y direction is smaller or parallel to the Y direction, thereby increasing the air supply distance of the outdoor unit 20 and reducing the wind resistance.

[0112] In some other embodiments, the second outer angle β2 is equal to the second inner angle α2. In this way, the wind resistance at the grille 33 can be reduced, and the air output of the outdoor unit 20 can be further increased.

[0113] In some other embodiments, the first outer angle β1 and the second outer angle β2 are both zero, so that the airflow blown out by the grille 33 flows parallel to the Y direction, further increasing the air supply distance of the outdoor unit 20.

[0114] In some embodiments, as shown in Figures 5 and 6, along the radial direction of the air outlet grille 3, a first inner angle α1 between the plurality of first sub-bars 3331 and the axial direction of the air outlet grille 3 decreases from the side away from the support portion 32 toward the side close to the support portion 32. Correspondingly, along the radial direction of the air outlet grille 3, a first outer angle β1 between the plurality of fourth sub-bars 3321 and the axial direction of the air outlet grille 3 decreases from the side away from the support portion 32 toward the side close to the support portion 32. In this way, the wind resistance at the grille 33 can be reduced, thereby increasing the air output of the outdoor unit 20 and increasing the flow distance of the airflow.

[0115] In some embodiments, as shown in Figures 5 and 7 , along the radial direction of the air outlet grille 3, a second inner angle α2 between the plurality of second sub-bars 3332 and the axial direction of the air outlet grille 3 decreases from the side away from the positioning portion 31 toward the side closer to the positioning portion 31. Correspondingly, along the radial direction of the air outlet grille 3, a second outer angle β2 between the plurality of fifth sub-bars 3322 and the axial direction of the air outlet grille 3 decreases from the side away from the positioning portion 31 toward the side closer to the positioning portion 31. This reduces wind resistance at the grille 33, thereby increasing the airflow volume of the outdoor unit 20 and extending the airflow distance.

[0116] In some embodiments, the angle range of the first inner angle α1 is (0°, 30°], for example, the angle of the first inner angle α1 is 0.5°, 2°, 10°, 20°, and 30°. Within the above range, as the angle of the first inner angle α1 increases, the diffusion angle of the airflow increases, and the air supply distance decreases.

[0117] It should be noted that if the first inner angle α1 is greater than 30°, the flow direction of the airflow passing through the grille mesh 33 will be severely deflected relative to the axial direction of the air outlet grille 3, resulting in a short air supply distance of the outdoor unit 20; the second grille 333 with a first inner angle α1 of 0° is the second sub-grate 3332.

[0118] In some embodiments, the angle range of the second inner angle α2 is (0°, 30°], for example, the angle of the second inner angle α2 is 0.5°, 2°, 10°, 20°, and 30°. Within the above range, as the angle of the second inner angle α2 increases, the diffusion angle of the airflow increases, and the air supply distance decreases.

[0119] It should be noted that if the second inner angle α2 is greater than 30°, the direction of the airflow through the grille mesh 33 will be severely deflected relative to the axial direction of the air outlet grille 3, resulting in a short air supply distance of the outdoor unit 20. The second grille bar 333 with a second inner angle of 0° is the second sub-grate bar 3332.

[0120] In some embodiments, the angle range of the first external angle β1 is (0°, 15°], for example, the angle of the first external angle β1 is 0.5°, 2°, 10°, 11°, 12°, 13°, 14°, and 15°. Within the above range, as the angle of the first external angle β1 increases, the diffusion angle of the airflow increases, and the air supply distance decreases.

[0121] In some embodiments, the angle range of the second outer angle β2 is (0°, 15°], for example, the angle of the second outer angle β2 is 0.5°, 2°, 10°, 11°, 12°, 13°, 14°, and 15°. Within the above range, as the angle of the second outer angle β2 increases, the diffusion angle of the airflow increases, and the air supply distance decreases.

[0122] In other embodiments, the grille 33 includes a plurality of fourth sub-bars 3321, a plurality of fifth sub-bars 3322, a plurality of first sub-bars 3331, and a plurality of second sub-bars 3332. This helps reduce wind resistance and increase air volume and air delivery distance, while simplifying the structure of the air outlet grille 3.

[0123] At this time, along the radial direction of the air outlet grille 3 , a first inner angle α1 between at least one second sub-bar 3332 and the Y direction is, for example, 0.5° to 2°.

[0124] 5 and 8 , the sixth sub-bars 3323 are, for example, arranged perpendicular to the radial direction of the air outlet grille 3. In this case, the third sub-bars 3333 are arranged corresponding to the sixth sub-bars 3323 along the Y direction.

[0125] In some embodiments, when the positioning portion 31 is shaped as a circular ring, at least one fourth sub-bar 3321 among the multiple fourth sub-bars 3321 is, for example, a concentric ring structure with an increasing radius extending radially outward from the air outlet grille 3; at least one fifth sub-bar 3322 among the multiple fifth sub-bars 3322 is, for example, a concentric ring structure with a decreasing radius extending radially outward from the air outlet grille 3; and at least one sixth sub-bar 3323 among the multiple sixth sub-bars 3323 is, for example, a concentric ring structure with a constant radius extending radially outward from the air outlet grille 3.

[0126] In this way, the airflow can be separated and accelerated twice through the second grid bar 333 and the first grid bar 332, and through the adaptive setting of multiple fourth sub-grid bars 3321, multiple fifth sub-grid bars 3322 and multiple sixth sub-grid bars 3323 and the angles between them and the Y direction, the airflow can be made to flow through the gap between two adjacent first grid bars 332 in a direction parallel to the setting direction of the first grid bars 332 on both sides of the gap relative to the Y direction, thereby reducing the wind resistance of the airflow at the air outlet grille 3 and improving the air volume and air outlet efficiency of the outdoor unit 20.

[0127] In some embodiments, multiple first bars 332 can be connected to at least a portion of at least one connection portion 331 to form a layer of grid mesh structure, and multiple second bars 333 can be connected to at least a portion of at least one connection portion 331 to form another layer of grid mesh structure.

[0128] In this way, the second bars 333 in the two-layer grid structure spaced apart along the Y direction can be spaced apart from the corresponding first bars 332, allowing airflow to flow sequentially through the second bars 333 and the corresponding first bars 332, thereby undergoing two flow separations to accelerate the airflow and reduce eddy currents. Furthermore, the connecting portions 331 in the two-layer grid structure 33 are also spaced apart, allowing airflow to flow through the two connecting portions 331, thereby undergoing two flow separations to accelerate the airflow and reduce eddy currents.

[0129] In other embodiments, as shown in FIG11 , multiple connecting portions 331 are disposed between the first bars 332 and the second bars 333 along the Y direction, so that the multiple connecting portions 331 can support and connect the first bars 332 and the second bars 333 to form a double-layered grid mesh 33. In this way, the connecting portions 331 serve as the supporting framework of the double-layered grid mesh 33, simplifying the structure of the grid mesh 33 and saving manufacturing materials. In this case, the connecting portions 331 are recessed relative to the first bars 332 toward the second bars 333, and recessed relative to the second bars 333 toward the first bars 332. This further saves manufacturing materials, and the recessed connecting portions 331 can partially conceal the bars.

[0130] In other embodiments, at least a portion of the side of at least one connecting portion 331 close to the first bar 332 is recessed toward the second bar 333 compared to the first bar 332, and the side of the portion of the connecting portion 331 close to the second bar 333 can be flush with the side of the second bar 333 away from the first bar 332 in the Y direction, so that the connecting portion 331 can support the side connecting the first bar 332 and the second bar 333, so that the structure of the grille 33 is simple and the appearance is better.

[0131] In other embodiments, at least a portion of the side of at least one connecting portion 331 that is close to the first bar 332 is flush with the side of the first bar 332 that is away from the second bar 333 in the Y direction, and the side of the portion of the connecting portion 331 that is close to the second bar 333 can be flush with the side of the second bar 333 that is away from the first bar 332 in the Y direction. In this way, the structure of the grid 33 can be simplified.

[0132] In some embodiments, as shown in FIG3 , the diameter of the minimum circumscribed circle of the support portion 32 is defined as the first radial dimension d1, and the diameter of the maximum inscribed circle of the positioning portion 31 facing the support portion 32 is defined as the second radial dimension d2. The second radial dimension d2 is the minimum radial dimension of the positioning portion 31.

[0133] In the annular region between the second radial dimension d2 of the positioning portion 31 and the first radial dimension d1 of the support portion 32 (i.e., d1>0), the plurality of first bars 332 and the plurality of second bars 333 are, for example, annular structures. If there is still space between the region having the second radial dimension d2 and the positioning portion 31, this portion can be filled with the fifth sub-bars 3322 and the third sub-bars 3333 to ensure that the radial spacing of the grid mesh 33 complies with relevant standards.

[0134] In some embodiments, the support portion 32 is, for example, a disc-shaped structure. If the diameter of the support portion 32 varies in the Y direction, the first radial dimension d1 is the maximum diameter of the support portion 32. In this case, the fourth sub-bars 3321 and the first sub-bars 3331 can be used to fill the area where the radial dimension of the first radial dimension d1 overlaps with the support portion 32, so that the radial spacing of the grid mesh 33 complies with relevant standards.

[0135] In some embodiments, when multiple connecting portions 331 converge and connect near the axis of the positioning portion 31 to form the support portion 32, the first radial dimension d1 can be zero, or can be regarded as the diameter of the hub of the fan blade 22. In this case, the fourth sub-bars 3321 and the first sub-bars 3331 can be used to fill the area within the first radial dimension d1, so that the radial spacing of the grid mesh 33 meets the relevant standards.

[0136] In some embodiments, along the radial direction of the air outlet grille 3, the maximum ratio of the difference between the diameter of one of the plurality of fourth sub-bars 3321 located near the positioning portion 31 and the first radial dimension d1 to the difference between the second radial dimension d2 and the first radial dimension d1 falls within the range [0.2, 0.3]. In this way, the arrangement area of ​​the plurality of fourth sub-bars 3321 can be defined based on the airflow conditions of the axial-flow fan blades 22.

[0137] In some embodiments, the minimum ratio of the difference between the diameter of a fifth sub-bar 3322 located near the support portion 32 and the first radial dimension d1 to the difference between the second radial dimension d2 and the first radial dimension d1 falls within the range of [0.7, 0.8]. In this way, the arrangement area of ​​the plurality of fifth sub-bars 3322 can be defined based on the airflow conditions of the axial-flow fan blades 22.

[0138] In some embodiments, a plurality of sixth sub-bars 3323 may be arranged in the region between the fourth sub-bar 3321 and the fifth sub-bar 3322 to fill the region at intervals along the radial direction.

[0139] In some embodiments, a portion of the fourth sub-bar 3321 corresponds to a first sub-bar 3331, and a portion of the fourth sub-bar 3321 and a first sub-bar 3331 are radially spaced apart along the positioning portion 31; a portion of the fifth sub-bar 3322 corresponds to a second sub-bar 3332, and a portion of the fifth sub-bar 3322 and a second sub-bar 3332 are radially spaced apart along the positioning portion 31; a portion of the sixth sub-bar 3323 corresponds to a third sub-bar 3333, and a portion of the sixth sub-bar 3323 and a third sub-bar 3333 are radially spaced apart along the positioning portion 31.

[0140] In other embodiments, the plurality of first sub-bars 3331 can be arranged correspondingly to the plurality of fourth sub-bars 3321 and spaced apart along the Y direction; the plurality of third sub-bars 3333 can be arranged correspondingly to the plurality of sixth sub-bars 3323 and spaced apart along the Y direction; and the plurality of second sub-bars 3332 can be arranged correspondingly to the plurality of fifth sub-bars 3322 and spaced apart along the Y direction. In this way, the wind resistance of the air outlet grille 3 can be reduced and the air supply distance of the outdoor unit 20 can be increased.

[0141] In some embodiments, as shown in FIG11 , the width of at least one first bar 332 is defined as Lj, and the maximum chord length of at least one first bar 332 is Lj. The angle between the width direction of at least one first bar 332 and the axis of the positioning portion 31 is an external angle β, and the external angle β includes a first external angle β1 and a second external angle β2. When the width dimensions Lj of the plurality of first bars 332 are equal, the external angle β of the fourth sub-bar 3321 and the fifth sub-bar 3322 is greater than zero. In this way, the height dimensions of the fourth sub-bar 3321 and the fifth sub-bar 3322 along the Y direction can be smaller than their width dimensions, and the height dimension of the sixth sub-bar 3323 along the Y direction can be equal to its width dimension.

[0142] In some embodiments, as shown in FIG11 , the width dimension of at least one second bar 333 is defined as Lc, and the maximum chord length of at least one second bar 333 is Lc. The angle between the width direction of at least one second bar 333 and the axis of the positioning portion 31 is an internal angle α, and the internal angle α includes a first internal angle α1 and a second internal angle α2. When the width dimensions of multiple second bars 333 are equal, the internal angle α between the first sub-bar 3331 and the second sub-bar 3332 is greater than zero. In this way, the height dimensions of the first sub-bar 3331 and the second sub-bar 3332 along the Y direction can be smaller than their width dimensions, and the height dimension of the third sub-bar 3333 along the Y direction can be equal to its width dimension.

[0143] In some embodiments, the width of second bars 333 is within the range of [4 mm, 10 mm]. For example, the width of second bars 333 can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm. As the width of second bars 333 increases, the resistance of airflow to outlet grille 3 increases. When the width of second bars 333 is within the range of [4 mm, 10 mm], the safety performance of air outlet grille 3 is guaranteed, and the resistance of airflow to outlet grille 3 meets the requirements.

[0144] In some embodiments, the width of the first bars 332 is in the range of [4 mm, 10 mm]. For example, the width of the first bars 332 can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm. As the width of the first bars 332 increases, the resistance of the air outlet grille 3 to the airflow increases. When the width of the first bars 332 is in the range of [4 mm, 10 mm], the safety performance of the air outlet grille 3 can be guaranteed, and the resistance of the air outlet grille 3 to the airflow meets the requirements.

[0145] It should be noted that when the width is less than 4 mm, the bending strength of the first bars 332 is low, which can cause extrusion deformation between two adjacent first bars 332, increase the gap width, and reduce the safety performance of the air outlet grille 3. When the width is greater than 10 mm, the time it takes for the airflow to flow through the air outlet grille 3 is increased, increasing the air outlet resistance.

[0146] In some embodiments, as shown in Figure 11, at least one first bar 332 corresponds to at least one second bar, and along the radial direction of the air outlet grille 3, the dimension between two adjacent second bars 333 in at least one second bar 333 away from the side of the first bar 332 is the third radial dimension Lz.

[0147] In some embodiments, along the radial direction of the air outlet grille 3 , a dimension between two adjacent first bars 332 of at least one first bar 332 on a side close to the second bar 333 is also the third radial dimension Lz.

[0148] For example, N first grating bars 332 and N second grating bars 333 are provided in the region between the support portion 32 and the positioning portion 31 . In this case, the third radial dimension Lz=( d2 − d1 ) / N.

[0149] In some embodiments, the third radial dimension Lz is within the range of [8.5 mm, 9.5 mm]. For example, the third radial dimension Lz can be 8.5 mm, 9 mm, or 9.5 mm. In this way, the grid 33 can prevent foreign matter from entering the accommodating cavity 11.

[0150] In some embodiments, as shown in Figure 11, along the axial direction of the air outlet grille 3, the dimension between the adjacent sides of at least one first bar 332 and at least one second bar 333 is defined as Lp, and the ratio of Lp to Lz is in the range of [0.1, 0.2]. For example, dimension Lp can be 0.85 mm to 1.9 mm. In this way, when the airflow passes through the second bar 333 and the corresponding first bar 332 in sequence, the two flow separations accelerate the airflow and reduce eddy currents.

[0151] It should be noted that when the ratio of dimension Lp to the third radial dimension Lz is less than 0.1, the airflow will not be able to flow out and separate through at least one second grid bar 333; when the ratio of dimension Lp to the third radial dimension Lz is greater than 0.2, a low-speed separation zone greater than a preset threshold will be formed between at least one second grid bar 333 and at least one first grid bar 332.

[0152] In some embodiments, as shown in FIG11 , along the axial direction of the air outlet grille 3 , the spacing between the side of the corresponding second bar 333 near the first bar 332 and the side of the first bar 332 near the second bar 333 is defined as a fourth radial dimension Ld. For example, the spacing between the first sub-bar 3331 and the fourth sub-bar 3321, and between the second sub-bar 3332 and the fifth sub-bar 3322 are defined as the fourth radial dimension Ld. The fourth radial dimension Ld is greater than zero, and the maximum ratio of the fourth radial dimension Ld to the third radial dimension Lz is within the range of [0.2, 0.3], thereby ensuring smooth airflow through the grille 33 .

[0153] In the process of the airflow detaching from the wall of the second grid bar 333 and attaching to the wall of the first grid bar 332, a plurality of gaps with a gap size of the fourth radial dimension Ld are generated between the second grid bar 333 and the first grid bar 332 along the Y direction. When the airflow flows through the gaps, the flow area becomes smaller, thereby increasing the flow rate of the airflow and thereby increasing the air output of the outdoor unit 20.

[0154] It should be noted that, along the radial direction of the air outlet grille 3 , the dimensions between the second bars 333 and the first bars 332 at different positions are partially identical to the fourth radial dimension Ld.

[0155] For example, the inner angle α and the outer angle β of the third sub-bar 3333 and the sixth sub-bar 3323 are zero. At this time, the fourth radial dimension Ld of the third sub-bar 3333 and the sixth sub-bar 3323 correspondingly arranged along the Y direction is, for example, zero. If the spacing dimension in the Y direction between the side of the first bar 332 close to the second bar 333 and the side of the second bar 333 away from the first bar 332 is equal to the sum of the projection length of its width dimension Lc in the axial direction of the positioning portion 31 and the axial spacing dimension Lp, then the sizes between the third sub-bar 3333 and the sixth sub-bar 3323 are equal.

[0156] In some embodiments, the fourth radial dimension between the first sub-bar 3331 and the fourth sub-bar 3321 is greater than zero, and the side of the fourth sub-bar 3321 closest to the first sub-bar 3331 is located radially along the positioning portion 31, on the side of the first sub-bar 3331 closest to the fourth sub-bar 3321, and closer to the support portion 32. This facilitates directing the airflow toward a direction parallel to the axis. For example, as the first outer angle β1 of the fourth sub-bar 3321 increases, the corresponding fourth radial dimension Ld increases, and the corresponding dimensions also increase.

[0157] Correspondingly, the fourth radial dimension between the second sub-bar 3332 and the fifth sub-bar 3322 is greater than zero, and the side of the fifth sub-bar 3322 closest to the second sub-bar 3332 is arranged along the radial direction of the positioning portion 31, on the side of the second sub-bar 3332 closest to the fifth sub-bar 3322, close to the positioning portion 31. This facilitates guiding the airflow direction closer to parallel to the axis. For example, as the second outer angle β2 of the fifth sub-bar 3322 increases, the corresponding fourth radial dimension Ld increases accordingly, and the corresponding dimensions also increase accordingly.

[0158] In some embodiments, the positioning portion 31 is an annular structure, and the support portion 32 is a disc-shaped structure. Within the installation area between the support portion 32 and the positioning portion 31, 25 first bars 332 are radially spaced 8.5 mm to 9.5 mm apart; 25 second bars 333 are radially spaced 8.5 mm to 9.5 mm apart; and a plurality of connecting portions 331 are circumferentially spaced around the support portion 32 and connect the support portion 32, the positioning portion 31, the second bars 333, and the first bars 332. Along the radial direction of the air outlet grille 3, in the direction from the positioning portion 31 to the support portion 32, the plurality of second bars 333 and the plurality of first bars 332 can be numbered sequentially from 1 to 25.

[0159] Based on this, the second bars 333 numbered 1 to 7 are second sub-bars 3332. The second inner angle α2 of the second sub-bars 3332 numbered 1 to 2 ranges from [20°, 28°], for example, their second inner angle α2 is 24°; the second inner angle α2 of the second sub-bars 3332 numbered 3 to 4 ranges from [16°, 24°], for example, their second inner angle α2 is 20°; the second inner angle α2 of the second sub-bar 3332 numbered 5 ranges from [14°, 20°], for example, their second inner angle α2 is 17°; the second inner angle α2 of the second sub-bar 3332 numbered 6 ranges from [6°, 12°], for example, their second inner angle α2 is 9°; and the second inner angle α2 of the second sub-bar 3332 numbered 7 ranges from [2°, 6°], for example, their second inner angle α2 is 4°.

[0160] The first bars 332 numbered 1 to 7 are fifth sub-bars 3322. The second outer angle β2 of the fifth sub-bars 3322 numbered 1 to 2 is [10°, 14°], for example, their second outer angle β2 is 12°; the second outer angle β2 of the fifth sub-bars 3322 numbered 3 to 4 is [8°, 12°], for example, their second outer angle β2 is 10°; the second outer angle β2 of the fifth sub-bar 3322 numbered 5 is [7°, 10°], for example, their second outer angle β2 is 8.5°; the second outer angle β2 of the fifth sub-bar 3322 numbered 6 is [3°, 6°], for example, their second outer angle β2 is 4.5°; and the second outer angle β2 of the fifth sub-bar 3322 numbered 7 is [1°, 3°], for example, their second outer angle β2 is 2°.

[0161] The second bars 333 numbered 8 to 18 are third sub-bars 3333 , and their inner angle α is 0°. The first bars 332 numbered 8 to 18 are sixth sub-bars 3323 , and their outer angle β is 0°.

[0162] Second bars 333 numbered 19 to 25 are first sub-bars 3331. The first inner angle α1 of first sub-bar 3331 numbered 19 is [2°, 6°], for example, its first inner angle α1 is 4°; the first inner angle α1 of first sub-bar 3331 numbered 20 is [6°, 12°], for example, its first inner angle α1 is 9°; the first inner angle α1 of first sub-bar 3331 numbered 21 is [14°, 20°], for example, its first inner angle α1 is 17°; the first inner angle α1 of first sub-bars 3331 numbered 22 to 23 is [16°, 24°], for example, its first inner angle α1 is 20°; and the first inner angle α1 of first sub-bars 3331 numbered 24 to 25 is [20°, 28°], for example, its first inner angle α1 is 24°.

[0163] The first bars 332 numbered 19 to 25 are fourth sub-bars 3321 . The first external angle β1 of the fourth sub-bar 3321 numbered 19 is [2°, 6°], for example, its first external angle β1 is 4°; the first external angle β1 of the fourth sub-bar 3321 numbered 20 is [6°, 12°], for example, its first external angle β1 is 9°; the first external angle β1 of the fourth sub-bar 3321 numbered 21 is [14°, 20°], for example, its first external angle β1 is 17°; the first external angle β1 of the fourth sub-bar 3321 numbered 22-23 is [16°, 24°], for example, its first external angle β1 is 20°; the first external angle β1 of the fourth sub-bar 3321 numbered 24-25 is [20°, 28°], for example, its first external angle β1 is 24°.

[0164] In some embodiments, the outdoor unit 20 provided with the improved air outlet grille 3 is taken as the first group (improved group), and the outdoor unit 20 provided with the air outlet grille 3 not provided with the plurality of second bars 333 is taken as the second group (control group).

[0165] When the speed of fan 2 is the same, the total air volume of the outdoor unit 20 of the first group is 4649.18m 3 / s; the turbulent kinetic energy at the outlet grille 3 is 0.23 J / kg; and the wind speed at the vent 12 of the outlet grille 3 is 3.89 m / s. The total air volume of the outdoor unit 20 of the second group is 4536.00 m 3 / s, the turbulent kinetic energy at the air outlet grille 3 is 0.27 J / kg, and the wind speed at the vent 12 of the air outlet grille 3 is 3.50 m / s.

[0166] Based on the above parameters, the air outlet grille 3 with a multi-layered grille mesh 33 structure can increase the air volume of the outdoor unit 2 by 0.29% and increase the average wind speed at the vent of the air outlet grille 3 by 10.96%, thereby reducing wind resistance and increasing the air volume of the outdoor unit 2. The improved solution also reduces the turbulent kinetic energy of the air outlet grille 3 by 13.29%, reducing aerodynamic noise at the air outlet grille 3.

[0167] Table 1

[0168] Table 1 shows the parameter relationship between the speed, air volume and noise of the blower 2 of the second group and the first group before and after the improvement. The data in Table 1 are used to create the line graph of the air volume and noise of the second group and the first group as shown in Figure 12.

[0169] As shown in Figure 12, the dotted line shows the relationship between the total air volume and noise level of the outdoor unit 20 before optimization (i.e., the second group), while the solid line shows the relationship between the total air volume and noise level of the outdoor unit 20 after optimization (i.e., the first group). As shown in Figure 12, the optimized solution can reduce noise by 1.5 dB(A) for the outdoor unit 20 at the same air volume, demonstrating significant noise reduction.

[0170] In other embodiments, as shown in FIG13 , the grille mesh 33 includes a single grille layer. In this case, as the air flows through the outlet grille 3, part of the airflow will be blown out of the housing 1 through the gaps in the grille mesh 33, while part of the airflow will be blown onto the connecting portion 331 and the outlet grille 3, thereby creating resistance to the air flow.

[0171] To reduce wind resistance between the connecting portion 331 and the air outlet grille 3, as shown in Figures 14 and 15, the dimension of the air outlet grille 3 in the axial direction of the positioning portion 31 is defined as a first dimension H1, and the dimension of the connecting portion 331 in the axial direction of the positioning portion 31 is defined as a second dimension H2. The first dimension H1 satisfies the requirement of H1 ≥ 6 mm, thus ensuring that the air outlet grille 3 can be ejected from the mold.

[0172] In some embodiments, the first dimension H1 further satisfies the following: 0.011 ≤ H1 / d2 ≤ 0.014; and the second dimension H2 satisfies the following: 0.011 ≤ H2 / d2 ≤ 0.014. Thus, when the size of the air outlet grille 3 is determined, the height of the air outlet grille 3 and the connecting portion 331 in the axial direction of the positioning portion 31 is reduced, thereby reducing the length of the gap in the grille mesh 33 in the axial direction of the positioning portion 31. This reduces the resistance of the air outlet grille 3 to the outgoing airflow, thereby reducing the operating power of the outdoor unit 20 and the operating cost of the outdoor unit 20.

[0173] In some embodiments, the grid mesh 33 further includes fifth bars 334, which extend along the circumference of the positioning portion 31. When the fifth bars 334 are annular, the first dimension H1 can be regarded as the first radial dimension d1.

[0174] In some embodiments, the second size H2 and the first size H1 satisfy: H2

[0175] For example, when the second dimension H2 is 0.4 mm smaller than the first dimension H1, the distance between the end surface of the connecting portion 331 away from the fan 2 and the end surface of the fifth bar 334 away from the fan 2 is 0.2 mm, and the distance between the end surface of the connecting portion 331 close to the fan 2 and the end surface of the fifth bar 334 close to the fan 2 is 0.2 mm. In this way, the connection between the connecting portion 331 and the fifth bar 334 can be made tighter, thereby increasing the structural strength of the air outlet grille 3.

[0176] ​In other embodiments, as shown in FIG16 , the air outlet grille 3 includes at least one third bar 3341 and at least one fourth bar 3342. One end of the at least one third bar 3341 is connected to the support portion 32, and the other end extends toward and is connected to the positioning portion 31. The at least one fourth bar 3342 protrudes along the circumference of the air outlet grille 3 (e.g., the X direction in FIG16 ). The at least one fourth bar 3342 is arranged around the center of the air outlet grille 3. If the air outlet grille 3 includes multiple fourth bars 3342, the multiple fourth bars 3342 are spaced apart in the radial direction of the air outlet grille 3. At least one third bar 3341 is connected to each fourth bar 3342.

[0177] Different from the air outlet grille 3 in Figure 13 , the air outlet grille 3 in Figure 16 includes a short axis and a long axis, wherein the short axis is the axis with the shortest radial dimension of the air outlet grille 3 , and the long axis is the axis with the longest radial dimension of the air outlet grille 3 .

[0178] In some other embodiments, as shown in Figure 17, the grille mesh 33 also includes at least one seventh rib 335 (for example, a partitioning rib 335), one end of at least one seventh rib 335 is connected to the positioning portion 31, and the other end is connected to the support portion 32, so that a closed area is formed between two adjacent seventh ribs 335.

[0179] In some other embodiments, the connecting portion 331 is a straight segment; the fifth bar 334 is partially straight and partially curved. Within a closed area, the fifth bar 334 and the connecting portion 331 intersect and connect. One end of the fifth bar 334 is connected to the positioning portion 31, and the other end of the fifth bar 334 is connected to the seventh rib 335. One end of the connecting portion 331 is connected to the positioning portion 31, and the other end of the connecting portion 331 is connected to the seventh rib 335.

[0180] At this time, the diameter of the positioning portion 31 is the second radial dimension d2 of the positioning portion 31 .

[0181] In yet other embodiments, as shown in FIG18 , the connecting portion 331 includes at least one first sub-connecting portion 3311 and at least one second sub-connecting portion 3312. One end of the at least one first sub-connecting portion 3311 is connected to the positioning portion 31, and the other end extends radially of the air outlet grille 3, or extends at a predetermined angle to the radial direction of the air outlet grille 3, and is connected to the support portion 32. If the at least one first sub-connecting portion 3311 includes multiple first sub-connecting portions 3311, the multiple first sub-connecting portions 3311 have the same length in the radial direction of the air outlet grille 3, are spaced apart circumferentially along the positioning portion 31, and are connected to each of the fifth bars 334. If the at least one second sub-connecting portion 3312 includes multiple second sub-connecting portions 3312, the multiple second sub-connecting portions 3312 are spaced apart axially along the positioning portion 31 and are connected to some of the fifth bars 334.

[0182] At this time, the diameter of the positioning portion 31 is the second radial dimension d2.

[0183] In some embodiments, as shown in Figure 19, the angle between the extension directions of two adjacent connection parts 331 in the multiple connection parts 331 is defined as θ, and θ satisfies: 7°≤θ≤11°, and θ is, for example, 7°, 8°, 9°, 10° or 11°.

[0184] In this way, the connection part 331 can support the fifth bar 334 to ensure that the fifth bar 334 is not easily deformed in its radial direction. On the premise of meeting the requirements of mold processing and installation specifications, the number of connection parts 331 included in the air outlet grille 3 is reduced, thereby reducing the resistance of the connection part 331 to the air flow blown out by the outdoor fan 2.

[0185] It should be noted that the angles between the extension directions of two adjacent connection portions 331 can be equal or different. In some embodiments, the angles between the extension directions of two adjacent connection portions 331 are equal, that is, the multiple connection portions 331 are evenly spaced along the circumference of the positioning portion 31.

[0186] In some embodiments, as shown in FIG19 , the plurality of connection portions 331 further include at least one third sub-connection portion 3313 and at least one fourth sub-connection portion 3314, which are sequentially spaced apart along the circumference of the positioning portion 31. The at least one third sub-connection portion 3313 and the at least one fourth sub-connection portion 3314 extend radially of the air outlet grille 3, and the length of the at least one third sub-connection portion 3313 is greater than the length of the at least one fourth sub-connection portion 3314.

[0187] One end of at least one third sub-connection portion 3313 and at least one fourth sub-connection portion 3314 is connected to the positioning portion 31 , the other end of at least one third sub-connection portion 3313 is connected to the supporting portion 32 , and at least one fourth sub-connection portion 3314 is cross-connected to multiple fifth bars 334 .

[0188] In this way, the problem that the diameter of the fifth grid bar 334 near the support part 32 is smaller and when at least one connecting part is connected to all the fifth grid bars 334, the gap between the two adjacent connecting parts 331 is smaller in the part near the support part 32, thereby causing greater resistance to the wind blown out by the fan 2 can be solved.

[0189] In some embodiments, the distance from the axis of the positioning portion 31 to the end of the fourth sub-connecting portion 3314 away from the positioning portion 31 is defined as a first distance L, and the radius of the positioning portion 31 is defined as R1. The first distance L satisfies the following relationship: 0.55 ≤ 2L / R1 ≤ 0.7. It should be noted that as the minimum radial dimension R of the grille 33 increases, the ratio of the first distance L to the radius of the positioning portion 31 (i.e., half of the minimum radial dimension R of the grille 33) increases accordingly.

[0190] In this way, when the radius R1 of the positioning portion 31 is determined, the length of the fourth sub-connection portion 3314 is determined by the above ratio, so that after the fourth sub-connection portion 3314 is coordinated with the third sub-connection portion 3313 and fixedly connected to the fifth grid bar 334, the gap between the fifth grid bars 334 meets the relevant standards.

[0191] In some embodiments, as shown in Figure 19, the fifth bar 334 includes a first rib 3343, and a fifth bar 334 close to the positioning portion 31 among the multiple fifth bars 334 between the end of the fourth sub-connection portion 3314 away from the positioning portion 31 and the axis of the grid mesh 33 is the first rib 3343.

[0192] The fifth bars 334 further include second ribs 3344 . Among the plurality of fifth bars 334 between the positioning portion 31 and the support portion 32 , a fifth bar 334 close to the positioning portion 31 is a second rib 3344 . The second rib 3344 is connected to each connecting portion 331 .

[0193] The fifth bar 334 further includes a third rib 3345 connected to an end of the fourth sub-connection portion 3343 away from the positioning portion 31 , and the third rib 3345 and the first rib 3343 are adjacent to each other and spaced apart in the radial direction of the grille net 33 .

[0194] In some embodiments, as shown in FIG. 19 , the first rib 3343 includes a first arc segment 33431 , and the first arc segment 33431 is an arc of the first rib 3343 located between two adjacent third sub-connecting portions 3313 .

[0195] The arc length of the first arc segment 33431 is defined as R2, and the arc length R2 satisfies: 0.15≤R2 / R1≤0.2. It should be noted that the ratio of the arc length R2 to the radius R1 of the positioning portion 31 may increase as the radius R1 of the positioning portion 31 increases.

[0196] Therefore, after the radius R1 of the positioning portion 31 is determined, the range of the arc length of the first arc segment 33431 is determined using the above conditions. At this time, since the angle θ between the extension directions of two adjacent connecting portions 331 is determined, that is, the angle 2θ between the two adjacent connecting portions 331 can also be determined, and thus the radius of the first arc segment 33431 can be determined, that is, the radius of the first rib 3343 can be determined. Therefore, the spacing between the first rib 13343 and the positioning portion 31 can be determined, and thus the spacing between any two adjacent fifth grid bars 334 can be determined.

[0197] In other embodiments, as shown in Figure 19, the second rib 3344 includes a second arc segment 33441, which is an arc of the second rib located between two adjacent connection parts 331, for example, between the adjacent third sub-connection part 3313 and the fourth sub-connection part 3314.

[0198] The arc length of the second arc segment 33441 is defined as R3, and the arc length R3 satisfies: 0.15≤R3 / R1≤0.2. It should be noted that the ratio of the arc length R3 to the radius of the positioning portion 31 can increase as the minimum radial dimension of the grid 33 increases.

[0199] When the minimum radial dimension of the grid mesh 33 is determined, the range of the arc length R3 of the second arc segment 33441 is determined by the above conditions. At this time, since the angle θ between the extension directions of two adjacent connecting parts 331 is determined, the radius of the second arc segment 33441 can be determined, thereby determining the spacing between the second rib 3344 and the positioning part 31, and then determining the spacing between any two adjacent fifth grid bars 334.

[0200] The spacing between two adjacent fifth bars 334 can be determined by calculating at least one of the ratio of the arc length R2 of the first arc segment 33431 to the radius of the positioning portion 31, or the ratio of the arc length R3 of the second arc segment 33441 to the radius of the positioning portion 31. This increases the spacing between any two adjacent fifth bars 334, ensuring that the air outlet grille 3 meets mold processing and installation specifications. This facilitates the flow of air from the fan 2 out of the air outlet grille 3 and reduces the resistance of the air outlet grille 3 to the air flow from the fan 2.

[0201] It should be noted that the structural form of the connecting portion 331 in FIG. 18 and FIG. 19 is also applicable to the grid mesh 33 including multiple grid layers shown in FIG. 4 .

[0202] In some embodiments, as shown in FIG20 , at least one fifth bar 334 further includes a fourth rib 3346, which is disposed proximate to the positioning portion 31. The opening of the fourth rib 3346 at the end proximate to the fan 2 is smaller than the opening at the end distal to the fan 2, i.e., the radial dimension of the fourth rib 3346 decreases as it moves away from the fan 2. This facilitates the guidance of the airflow flowing to the location of the fourth rib 3346 and solves the problem of different air volumes and different air outlet directions at different locations on the grille 33, which, when the radial dimensions of multiple fifth bars 334 are the same, can affect the air volume of the outdoor unit 20.

[0203] At this time, the radius of the at least one fifth grating 334 is defined as J, and the ratio of the radius J of the at least one fifth grating 334 to the first distance L satisfies: 0.28≤J / L≤0.44.

[0204] As shown in FIG. 21 , when the radial dimension of the fourth rib 3346 is not adjusted, the airflow collides with the grille 33 at the location of the fourth rib 3346 to generate a large vortex, thereby causing greater resistance to the airflow.

[0205] As shown in FIG22 , after the fourth rib 3346 is adjusted according to the above conditions, the airflow is guided by the fourth rib 3346 , and the vortex generated by the airflow at the fourth rib 3346 is reduced. The airflow encounters less resistance here, and the flow rate is more stable.

[0206] In some embodiments, as shown in Figure 20, at least one fifth grid bar 334 also includes a fifth rib 3347. The fifth rib 3347 is located in the middle position of the positioning portion 31 and the support portion 32 in the radial direction of the grille mesh 33. The airflow at this position is smooth, so the radial size of the fifth rib 3347 does not change.

[0207] At this time, the ratio of the radius J of at least one fifth grid bar 334 to the first distance L satisfies: 0.44≤J / L≤0.78. In some embodiments, as shown in FIG20 , at least one fifth grid bar 334 further includes a sixth rib 3348 , which is located near the support portion 32 . The opening of the end of the sixth rib 3348 near the fan 2 is larger than the opening of the end away from the fan 2 , that is, the radial dimension of the sixth rib 3348 increases in a direction away from the fan 2 , so that the sixth rib 3348 can guide the airflow flowing to the sixth rib 3348 .

[0208] At this time, the ratio of the radius J of at least one fifth grating 334 to the first distance L satisfies: J / L≥0.78.

[0209] As shown in FIG23 , when the radial dimension of the sixth rib 3348 is not adjusted, the airflow collides severely with the air outlet grille 3 at the sixth rib 3348 and generates a vortex near the support portion 32 , thereby causing greater resistance to the airflow.

[0210] As shown in FIG24 , after the sixth rib 3348 is adjusted according to the above conditions, the airflow is guided by the sixth rib 3348 , and the vortex generated by the airflow at the sixth rib 3348 is reduced. The airflow encounters less resistance here, and the flow rate is more stable.

[0211] It should be noted that when J / L < 0.28, the radius J of the at least one fifth grating rib 334 is smaller than the radius of the support portion 32. In this case, only the support portion 32 can be provided, and the at least one fifth grating rib 334 cannot be provided. Furthermore, when J / L = 0.28, the at least one fifth grating rib 334 is fixed to the peripheral wall of the support portion 32.

[0212] In some embodiments, the projection of the axis of at least one fifth grid bar 334 onto its inner wall is a first straight line segment. As shown in FIG20 , when 0.28 ≤ J / L ≤ 0.44, that is, when the first straight line segment is the projection of the axis of fourth rib 3346 onto its inner wall, the angle C1 between the extension of the first straight line segment and the axis of at least one fifth grid bar 334 is 75-160×(J / L).

[0213] In this way, the airflow flowing to the fourth rib 3346 of the air outlet grille 3 can be better reversed, thereby reducing the resistance of the air outlet grille 3 to the airflow blown out by the fan 2.

[0214] In some embodiments, when J / L ≥ 0.78, that is, when the first straight line segment is the projection of the axis of the sixth rib 3348 on the inner wall surface of the sixth rib 3348, the angle C2 between the extension line of the first straight line segment and the axis of at least one fifth grid bar 334 is 50-64×(J / L).

[0215] In this way, the airflow flowing to the sixth rib 3348 of the air outlet grille 3 can be better guided, thereby reducing the resistance of the air outlet grille 3 to the airflow blown out by the fan 2.

[0216] It should be noted that, as shown in Figures 5 and 20, the fourth rib 3346 has the same structure as the fourth sub-bar 3321, the fifth rib 3347 has the same structure as the sixth sub-bar 3323, and the sixth rib 3348 has the same structure as the fifth sub-bar 3322. The grille mesh 33 composed of three types of fifth bars 334 located between the positioning portion 31 and the support portion 32 in the solution shown in Figure 20 is equivalent to the grille mesh 33 formed only by the first bars 332 and the connecting portion 331 in the solution shown in Figure 5.

[0217] Correspondingly, the inclination direction and inclination angle of the angle C2 can refer to the setting of the first external angle β1 shown in Figure 6, and the inclination direction and inclination angle of the angle C1 can refer to the setting of the second external angle β2 shown in Figure 7. The width direction of the fifth rib 3347 can be arranged parallel to the Y direction, that is, its inclination angle can be zero.

[0218] In some embodiments, as shown in FIG. 25 and FIG. 26 , at least one connection portion 331 includes a wind guide surface 3315 , and the wind guide surface 3315 is the side surfaces of two adjacent connection portions 331 facing each other.

[0219] In some embodiments, as shown in FIG. 26 , the wind guiding surface 3315 includes a first side 33151 and a second side 33152 , and the second side 33152 is disposed on a side of the first side 33151 away from the fan 2 .

[0220] In some embodiments, when the rotation speed of the fan 2 is low, the wind guide surface 3315 is perpendicular to the end surface of the positioning portion 31 facing the grille 33 .

[0221] In some embodiments, an angle γ1 is formed between the wind guide surface 3315 and the end surface of the positioning portion 31 facing the grille mesh 33, that is, in the axial direction of the positioning portion 31 (that is, the Y direction), the second side 33152 is located on the side of the first side 33151 away from the fan 2, and along the rotation direction of the fan 2 (such as the direction Z in Figure 26), the second side 33152 is located on the side of the first side 33151.

[0222] In some embodiments, the angle γ1 satisfies the following: 80°≤γ1<90°. For example, the angle γ1 can be 80°, 82°, 84°, 85°, 86°, or 89°. In this way, the air guide surface 3315 can facilitate reverse flow of the airflow blown by the fan 2, thereby reducing the resistance of the grille 33 to the airflow blown by the fan 2.

[0223] In some embodiments, as shown in FIG25 , the axial dimension of the positioning portion 31 is defined as a fourth dimension H4. The fourth dimension H4 satisfies the following conditions: 5 mm ≤ H4 ≤ 60 mm. For example, the fourth dimension H4 can be 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, or 60 mm. This can reduce the resistance of the positioning portion 31 to airflow.

[0224] It should be noted that, when H4 is less than 5 mm, the production difficulty of the positioning portion 31 will increase, and the strength of the positioning portion 31 will be reduced, so that the positioning portion 31 will be easily damaged during use.

[0225] When H4>60mm, since the grille 33 is fixed to the end of the positioning part 31 away from the fan 2, the distance between the grille 33 and the fan 2 will be large, resulting in excessive dispersion of the airflow after it hits the grille 33, thereby increasing the resistance to the airflow and the air volume loss.

[0226] In some embodiments, as shown in Figures 6 and 27, the positioning portion 31 includes at least one through hole 311, and the at least one through hole 311 is disposed on a side of the positioning portion 31 away from the fan 2. In this way, the airflow flowing to the positioning portion 31 can flow out through the at least one through hole 311, further reducing the resistance of the positioning portion 31 to the airflow blown out by the fan 2.

[0227] The maximum dimension of the through hole 311 along the axial direction of the positioning portion 31 is defined as L2, and L2 satisfies the following: 0.023≤2L2 / R≤0.027.

[0228] The maximum dimension of the through hole 311 along the circumference of the positioning portion 31 is defined as L3, and L3 satisfies: 0.09≤2L3 / R≤0.1. In this way, the area of ​​the through hole 311 can be made larger, which is more conducive to the outflow of air from the through hole 311.

[0229] As shown in Figure 28, when no through hole 311 is provided on the side wall of the positioning portion 31 away from the fan 2, the airflow flowing to the positioning portion 31 is blocked by the positioning portion 31, thereby colliding with the positioning portion 31 and at least one fifth grid bar 334 and the connecting portion 331 near the positioning portion 31, thereby affecting the flow velocity of the airflow at that location and causing resistance to the flow of the airflow at that location.

[0230] As shown in Figure 29, when the through hole 311 is provided in the positioning portion 31, the airflow flowing to the positioning portion 31 has less impact on the positioning portion 31, the at least one fifth grid bar 334 near the positioning portion 31, and the connecting portion 331. The airflow velocity in this area is also improved, reducing the resistance of the positioning portion 31 to the airflow.

[0231] In some embodiments, as shown in FIG2 , the outdoor unit 20 further includes an air guide 4 disposed within the accommodating cavity 11 and located at the vent 12. The air guide 4 is connected to the housing 1 and extends around the circumference of the vent 12. The air guide 4 is configured to guide the airflow from the fan 2 toward the vent 12 and the air outlet grille 3, thereby facilitating airflow out of the housing 1 through the vent 12 and the air outlet grille 3. The minimum radial dimension of the air guide 4 is a third dimension H3.

[0232] In some embodiments, as shown in FIG30 , the third dimension H3 and the second radial dimension d2 satisfy the following: 1≤d2 / H3≤1.25. This allows the air guide 4 to guide the airflow from the fan 2 to the air outlet grille 3, reducing the effect of the air guide 4 on the airflow from the fan 2.

[0233] It should be noted that the positioning portion 31 is located at the edge of the air outlet grille 3 , and the minimum radial dimension of the grille mesh 33 is the minimum radial dimension d2 of the positioning portion 31 .

[0234] In some embodiments, when the ratio of the third dimension H3 to the second radial dimension d2 satisfies the following condition: d2 / H3>1.25, as the minimum radial dimension of the positioning portion 31 increases relative to the minimum radial dimension of the air guide portion 4, the amount of air blown out from the gaps in the grille mesh 33 of the air outlet grille 3 no longer increases, and the amount of air blown to the portion of the air outlet grille 3 near the positioning portion 31 no longer decreases, resulting in no significant effect on reducing the wind resistance of the air outlet grille 3. Furthermore, this may increase the production cost of the air outlet grille 3 and reduce its inherent strength.

[0235] In some embodiments, as shown in Figure 32, when 1.05≤d2 / H3≤1.15, the exponential increase in the amount of airflow blown by the fan 2 onto the bars of the air outlet grille 3 increases, so that the airflow generated by the fan 2 is guided by the air guide part 4 to blow onto the air outlet grille 3, and the effect of reducing the resistance of the air outlet grille 3 is more obvious. Under the premise of controlling production costs and ensuring the strength of the air outlet grille 3 itself, the resistance of the air outlet grille 3 to the airflow blown out by the fan 2 can be further reduced.

[0236] In some embodiments, as shown in FIG30 , the point on at least one blade 22 that is farthest from the axis of the fan 2, and the diameter of the largest circular ring formed by rotating around the axis of the fan 2 are defined as R2. Wherein, R2 and d1 satisfy 1.02≤d1 / R2≤1.1, and d1-R2≥12mm. In this way, the diameter of the largest circular ring formed by the rotation of at least one blade 22 can be made smaller than the minimum radial dimension H3 of the air guide portion 4, so as to meet the assembly requirements of at least one blade 22, so that at least one blade 22 can be installed in the air guide portion 4 and will not collide with the air guide portion 4 during operation. In addition, the airflow generated by at least one blade 22 will not be too dispersed, so that the airflow generated by the fan 2 will not collide too much with the air guide portion 4, the housing 1 and the air outlet grille 3, thereby reducing the resistance to the airflow and the loss of air volume.

[0237] It should be noted that, when d1 and R2 satisfy: d1 / R2<1.02, at least one fan blade 22 cannot be installed in the air guide portion 4, so that the assembly requirements of the fan blade 22 cannot be met.

[0238] When d1 and R2 satisfy the following ratio: d1 / R2>1.1, the diameter of the largest circular ring formed by the rotation of at least one blade 22 is smaller than the minimum radial dimension of the air guide 4. This causes the airflow generated by at least one blade 22 to be excessively dispersed within the air guide 4. This causes the airflow generated by at least one blade 22 to collide excessively with the air guide 4, the housing 1, and the air outlet grille 3, increasing the resistance to the airflow generated by the fan 2 and increasing airflow loss.

[0239] In some embodiments, as shown in Figures 30 and 31 , the air guide 4 includes a first sub-air guide 41 and a second sub-air guide 42, which are connected to each other. The first sub-air guide 41 is connected to the housing 1, and the second sub-air guide 42 is disposed on a side of the first sub-air guide 41 away from the housing 1 along the Y direction. The radial dimension of the first sub-air guide 41 decreases along the direction toward the second sub-air guide 42.

[0240] The first sub-air guide portion 41 of the air guide portion 4 guides the airflow blown out by the fan 2, so that the airflow can be blown toward the air outlet grille 3, reducing the collision between the airflow and the air guide portion 4, further reducing the resistance to the airflow, and increasing the air volume of the outdoor unit 20.

[0241] In some embodiments, as shown in Figure 31 , the axial dimension of the first sub-air guide 41 in the vent 12 is defined as M, where M satisfies the following: 0 < M ≤ 20 mm. For example, M is 5 mm, 10 mm, 15 mm, or 20 mm. In this case, the airflow from the fan 2 can be directed along the first sub-air guide 41 toward the air outlet grille 3, reducing collisions between the airflow and the air guide 4, further reducing resistance to the airflow, and increasing the air volume of the outdoor unit 20.

[0242] It should be noted that when M>20 mm, the first sub-air guide 41 will cause the airflow blown out by the fan 2 to be too dispersed after being guided by the first sub-air guide 41. This will increase the amount of air blowing toward the positioning portion 31 of the air outlet grille 3, thereby increasing the resistance of the air outlet grille 3 to the airflow and the air volume loss.

[0243] In some embodiments, as shown in FIG31 , the first sub-air guide portion 41 of the air guide portion 4 includes an inner circumferential surface, which is the circumferential surface of the first sub-air guide portion 41 facing the vent 12. The angle between the normal of the inner circumferential surface and the axis of the vent 12 is defined as γ2, where γ2 satisfies the following: 75°≤γ2<90°. For example, γ2 is 75°, 80°, 85°, or 90°.

[0244] In this way, the first sub-air guide 41 can blow the airflow blown out by the fan 2 toward the air outlet grille 3 along the inner circumference, reducing the collision between the airflow and the air guide 4, further reducing the resistance to the airflow, and increasing the air volume of the outdoor unit 20.

[0245] It should be noted that when γ2 is less than 75°, the first sub-air guide portion 41 will cause the airflow blown out by the fan 2 to be too dispersed after being guided by the first sub-air guide portion 41, resulting in an increase in the amount of air blown toward the positioning portion 31, thereby increasing the resistance of the air outlet grille 3 to the airflow and the air volume loss.

[0246] When γ2=90°, the inner circumference of the first sub-air guide portion 41 will extend along the axis of the vent 12 in the direction away from the accommodating chamber 11, losing its guiding function for air flow diffusion, causing the air flow to blow onto the air guide portion 4 and collide with the air guide portion 4, causing the air flow to be resisted by the air guide portion 4, thereby increasing the loss of air volume of the outdoor unit 20.

[0247] When γ2>90°, the radial dimension of the first sub-air guide portion 41 increases in the direction from the first sub-air guide portion 41 to the second sub-air guide portion 42. The inner circumference of the first sub-air guide portion 41 causes the airflow blown by the fan 2 to be concentrated toward the central axis of the vent 12, resulting in the inner circumference of the first sub-air guide portion 41 generating resistance to the airflow blown by the fan 2, increasing the resistance to the airflow and the loss of air volume.

[0248] In some embodiments, the minimum radial dimension of the second sub-air guiding portion 42 is the minimum radial dimension of the air guiding portion 4 .

[0249] In some embodiments, when the second radial dimension d2 increases and the first radial dimension d1 remains unchanged, the minimum radial dimension of the grille 33 increases relative to the minimum radial dimension d1 of the air guide 4. This way, the coverage area of ​​the airflow directed by the air guide 4 onto the air outlet grille 3 remains unchanged, while the area of ​​the air outlet grille 3 increases, allowing some of the airflow that would have otherwise reached the edge of the air outlet grille 3 to reach the grille 33 and exit the outdoor unit 20 through it. This further reduces the resistance of the positioning portion 31 to the airflow, thereby reducing the resistance of the air outlet grille 3 to the airflow from the fan 2.

[0250] In other embodiments, when the second radial dimension d2 remains unchanged and the first radial dimension d1 decreases, the minimum radial dimension of the air outlet grille 3 increases relative to the minimum radial dimension of the air guide 4. This reduces the coverage area of ​​the airflow directed to the air outlet grille 3 by the air guide 4, while maintaining the area of ​​the air outlet grille 3. This allows some of the airflow that would have otherwise reached the edge of the air outlet grille 3 to instead reach the bars of the air outlet grille 3 and exit the outdoor unit 20 through the gaps therein. This further reduces the resistance of the positioning portion 31 to the airflow, thereby reducing the resistance of the air outlet grille 3 to the airflow from the fan 2.

[0251] When the second radial dimension d2 increases and the first radial dimension d1 decreases, the minimum radial dimension of the air outlet grille 3 increases relative to the minimum radial dimension of the air guide 4. This reduces the coverage area of ​​the airflow directed onto the air outlet grille 3 by the air guide 4, while increasing the area of ​​the air outlet grille 3. This allows some of the airflow that would have otherwise reached the edge of the air outlet grille 3 to instead reach the bars of the air outlet grille 3 and exit the outdoor unit 20 through the gaps between the bars. This further reduces the resistance of the positioning portion 31 to the airflow, thereby reducing the resistance of the air outlet grille 3 to the airflow from the fan 2.

[0252] Table 2

[0253] Table 2 compares the dimensional parameters and performance parameters of outdoor units according to some embodiments. As shown in Table 2, the dimensional relationship between the air guide 4 and the air outlet grille 3 was simulated. In some embodiments, Scheme 1 and Scheme 2 are provided. The minimum radial dimension d1 of the air guide 4 in Scheme 1 is equal to the minimum radial dimension d1 of the air guide 4 in Scheme 2, and the minimum radial dimension d2 of the positioning portion 31 in Scheme 1 is 40 mm smaller than the minimum radial dimension d2 of the positioning portion 31 in Scheme 2. In this case, the value of d2 / d1 in Scheme 2 is approximately 0.088, while the value of d2 / d1 in Scheme 1 is approximately 0.023, and the value of d2 / d1 in Scheme 2 is 0.065 greater than the value of d2 / d1 in Scheme 1.

[0254] The air volume of the outdoor unit 20 reaches the same value, for example, 4626m 3 / h. At this time, the speed of fan 2 in Solution 1 is 681 rpm, and the speed of fan 2 in Solution 2 is 634 rpm. That is, to achieve the same air output, the speed of fan 2 required in Solution 2 is 47 rpm lower than that required in Solution 1. Furthermore, the noise generated by the outdoor unit 20 in Solution 1 is 56.8 dB, while the noise generated by the outdoor unit 20 in Solution 2 is 54.7 dB, meaning that the noise generated by the outdoor unit 20 in Solution 2 is 2.1 dB lower than that generated by the outdoor unit 20 in Solution 1.

[0255] It can be seen from Table 2 that, when the diffusion range of the airflow after blowing out of the air guide part 4 remains unchanged, the increase in the minimum radial dimension d2 of the air outlet grille 3 relative to the minimum radial dimension d1 of the air guide part 4 can reduce the loss of air outlet volume caused by the air outlet grille 3, and can make the required speed of the fan 2 lower and the noise generated lower when the outdoor unit 20 reaches the same air volume and obtains the same heat exchange efficiency, thereby improving the user experience of the outdoor unit 20.

[0256] The diameter of the largest circular ring formed by the rotation of the fan blades 22 is R2, and the value of R2 is 600 mm. The size of the positioning portion 31 of the air outlet grille 3 in the axial direction of the vent 12 is H4, and H4 is 30 mm. The minimum radial size d2 of the air guide portion 4 in Scheme 2, the diameter R2 of the largest circle formed by the rotation of the fan blades 22, and the size H4 of the positioning portion 31 of the air outlet grille 3 in the axial direction of the vent 12 are consistent with those in Scheme 1.

[0257] It can be understood that the airflow generated by the fan 2 is guided by the air guide part 4 and blown onto the air outlet grille 3. The resistance of the air outlet grille 3 is reduced, the air volume loss is reduced, the air volume of the outdoor unit 20 is increased, and the heat exchange efficiency of the outdoor unit 20 is improved.

[0258] In some embodiments, as shown in Figure 31, the casing 1 includes a panel 13, the panel 13 includes a first plate 131, a second plate 132 and a third plate 133, and the first plate 131, the second plate 132 and the third plate 133 are connected in sequence along the radial direction of the vent 12.

[0259] The first plate 131 is arranged around the second plate 132, and the second plate 132 is arranged around the third plate 133. The third plate 133 is arranged on the side of the first plate 131 facing the accommodating chamber 11, and the vent 12 is formed on the third plate 133. In this way, when the air outlet grille 3 is installed at the vent 12, the axial dimension of the outdoor unit 20 at the vent 12 is smaller than the sum of the axial dimensions of the positioning portion 31 and the housing 1 at the vent 12, meeting the requirements for a compact design of the outdoor unit 20.

[0260] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0261] Those skilled in the art will understand that the scope of the present disclosure is not limited to the above specific embodiments, and that certain elements of the embodiments may be modified and replaced without departing from the spirit of the present disclosure. The scope of the present disclosure is limited by the appended claims.

Claims

1. An air conditioner, comprising: Indoor unit; as well as Outdoor unit, including: The housing comprises a vent and a receiving cavity, wherein the vent is connected to the receiving cavity; A fan is arranged in the accommodating cavity and is arranged corresponding to the vent; Air outlet grille, including: A positioning portion, the positioning portion is arranged at the edge of the air outlet grille, extends circumferentially along the edge of the air outlet grille, is connected to the housing, and is arranged close to the vent; a supporting portion, the supporting portion being coaxially disposed with the air outlet grille and configured to support the air outlet grille; and Grille, including: at least one connecting portion, one end of the at least one connecting portion is connected to the supporting portion, and the other end faces the positioning portion and extends along the radial direction of the air outlet grille; at least one first bar disposed between the positioning portion and the supporting portion; and At least one second bar is arranged between the positioning portion and the supporting portion; along the axial direction of the air outlet grille, the at least one second bar is arranged on a side of the at least one first bar close to the fan, and is spaced apart from the at least one first bar.

2. The air conditioner according to claim 1, wherein: The at least one first grid bar comprises a plurality of first grid bars, the plurality of first grid bars are arranged at intervals along the radial direction of the air outlet grille, and the plurality of first grid bars are connected to at least a portion of the at least one connecting portion; The at least one second bar includes a plurality of second bars, the plurality of second bars are arranged at intervals along the radial direction of the air outlet grille, and the second bars are connected to at least a portion of the at least one connecting portion.

3. The air conditioner according to claim 2, wherein: The plurality of second bars include: At least one first sub-grid bar is arranged near the positioning portion; along the axial direction of the air outlet grille, the angle between the at least one first sub-grid bar from its side away from the fan to its side close to the fan and the axial direction of the air outlet grille is a first inner angle; At least one second sub-bar is arranged near the supporting portion; along the axial direction of the air outlet grille, the at least one second sub-bar points from its side away from the fan to its side close to the fan, and the angle between the at least one second sub-bar and the axial direction of the air outlet grille is a second inner angle.

4. The air conditioner according to claim 3, wherein: The at least one first sub-grid bar comprises a plurality of first sub-grid bars, and the plurality of first sub-grid bars are arranged at intervals along the radial direction of the air outlet grille; The at least one second sub-grid bar comprises a plurality of second sub-grid bars, and the plurality of second sub-grid bars are arranged at intervals along the radial direction of the air outlet grille.

5. The air conditioner according to claim 3 or 4, wherein: The plurality of second grid bars further include: At least one third sub-bar is disposed between the at least one first sub-bar and the at least one second sub-bar along the radial direction of the air outlet grille; the at least one third sub-bar points from its side away from the fan to its side close to the fan, and is parallel to the axial direction of the air outlet grille.

6. The air conditioner according to claim 5, wherein: The at least one third sub-bar comprises a plurality of third sub-bars, and the plurality of third sub-bars are arranged at intervals along the radial direction of the air outlet grille.

7. The air conditioner according to any one of claims 2 to 6, wherein: The plurality of first grid bars include: at least one fourth sub-grid bar, the at least one fourth sub-grid bar being arranged near the positioning portion; along the axial direction of the air outlet grille bar, the at least one fourth sub-grid bar points from the side away from the fan to the side close to the fan, and the angle between the at least one fourth sub-grid bar and the circumference of the air outlet grille is a first outer angle; At least one fifth sub-bar, wherein the at least one fifth sub-bar is arranged close to the support portion; along the axial direction of the air outlet grille, the at least one fifth sub-bar points from its side away from the fan to its side close to the fan, and the angle between the at least one fifth sub-bar and the axial direction of the air outlet grille is a second external angle.

8. The air conditioner according to claim 7, wherein: The at least one fourth sub-grid bar comprises a plurality of fourth sub-grid bars, and the plurality of fourth sub-grid bars are arranged at intervals along the radial direction of the air outlet grille; The at least one fifth sub-bar comprises a plurality of fifth sub-bars, and the plurality of fifth sub-bars are arranged at intervals along the radial direction of the air outlet grille.

9. The air conditioner according to claim 8, wherein: Along the axial direction of the air outlet grille, the at least one first sub-bar and the at least one fourth sub-bar are arranged correspondingly, and the corresponding ratio range of the first outer angle to the first inner angle is [0.4, 0.6].

10. The air conditioner according to claim 8, wherein: Along the axial direction of the air outlet grille, the at least one second sub-bar and a fifth sub-bar among the plurality of fifth sub-bars are arranged correspondingly, and the corresponding ratio of the second outer angle to the second inner angle is in the range of [0.4, 0.6].

11. The air conditioner according to any one of claims 7 to 10, wherein: The first inner angle and the second inner angle satisfy at least one of the following: Along the radial direction of the air outlet grille, a first inner angle between the at least one first sub-bar and the axial direction of the air outlet grille decreases from a side away from the support portion toward a side close to the support portion; Along the radial direction of the air outlet grille, a second inner angle between the at least one second sub-bar and the axial direction of the air outlet grille decreases from a side away from the positioning portion toward a side close to the positioning portion; The first inner angle is greater than 0° and less than or equal to 30°; or The second inner angle is greater than 0° and less than or equal to 30°.

12. The air conditioner according to claim 7 or 8, wherein: The plurality of first grid bars further include: At least one sixth sub-bar is disposed between the at least one fourth sub-bar and the at least one fifth sub-bar along the radial direction of the air outlet grille; the at least one sixth sub-bar points from its side away from the fan to its side close to the fan, and is parallel to the axial direction of the air outlet grille.

13. The air conditioner according to claim 12, wherein: The at least one sixth sub-bar comprises a plurality of sixth sub-bars, and the plurality of sixth sub-bars are arranged at intervals along the radial direction of the air outlet grille.

14. The air conditioner according to claim 8, wherein: Along the radial direction of the air outlet grille, a maximum ratio of a difference between a diameter dimension of a fourth sub-bar in the at least one fourth sub-bar close to the positioning portion and the first radial dimension to a difference between the second radial dimension and the first radial dimension is in a range of [0.2, 0.3]; Along the radial direction of the air outlet grille, a minimum ratio of a difference between a diameter of a fifth sub-bar in the at least one fifth sub-bar close to the support portion and the first radial dimension to a difference between the second radial dimension and the first radial dimension is in a range of [0.7, 0.8]; The first radial dimension is the diameter of the smallest circumscribed circle of the support portion, and the second radial dimension is the diameter of the largest inscribed circle on the inner side of the positioning portion.

15. The air conditioner according to any one of claims 1 to 14, satisfying at least one of the following: Along the radial direction of the air outlet grille, the dimension between the sides of two adjacent first bars in the at least one first bar close to the second bar is the third radial dimension; along the axial direction of the air outlet grille, the ratio of the dimension between the sides of the at least one first bar and the at least one second bar close to each other to the third radial dimension is in the range of [0.1, 0.2]; or Along the axial direction of the air outlet grille, the spacing dimension between the corresponding at least one second bar and the side of the at least one first bar close to each other is a fourth radial dimension; the maximum ratio range of the fourth radial dimension to the third radial dimension is [0.2, 0.3].

16. The air conditioner according to any one of claims 1 to 14, wherein: Along the axial direction of the air outlet grille, at least a portion of the at least one connection portion is located on a side of the first bar close to the fan, and at least one of the at least one connection portion connects a side of the first bar close to the second bar and the second bar.

17. The air conditioner according to any one of claims 1 to 16, wherein: The outdoor unit further comprises: An air guide portion, the air guide portion is disposed in the accommodating cavity and located at the vent; the air guide portion is connected to the housing and extends along the circumference of the vent; The minimum radial dimension of the air guide portion is defined as a first radial dimension d1, the minimum radial dimension of the positioning portion is defined as a second radial dimension d2, and the first radial dimension d1 and the second radial dimension d2 satisfy: 1≤d2 / d1≤1.

25.

18. The air conditioner according to claim 17, wherein: The first radial dimension d1 and the second radial dimension d2 also satisfy: 0.05≤(d2-d1) / d1≤0.

15.

19. The air conditioner according to any one of claims 17 to 18, wherein: The air guide portion comprises: A first sub-air guide portion connected to the housing; A second sub-air guide portion is connected to the first sub-air guide portion, and the second sub-air guide portion is arranged on a side of the first sub-air guide portion away from the housing; Wherein, along the direction from the first sub-air guiding portion to the second sub-air guiding portion, the radial dimension of the first sub-air guiding portion decreases.

20. The air conditioner according to claim 19, wherein: The first sub-air guiding portion includes an inner circumferential surface, and an angle between a normal line of the inner circumferential surface and an axis line of the vent is greater than or equal to 70° and less than 90°.

Images