Air conditioner

Abstract

Provided is an air conditioner (100). The air conditioner (100) comprises an indoor unit (2) and an outdoor unit (1). The indoor unit (2) comprises an indoor heat exchanger. The outdoor unit (1) comprises a compressor, an outdoor heat exchanger, a housing (10), an outdoor fan (20), an air outlet grille (30), and an air guide part (40). The housing (10) comprises a mounting opening (101) and an accommodating cavity (102), and the mounting opening (101) is in communication with the outside and the accommodating cavity (102). The outdoor fan (20) is arranged in the accommodating cavity (102) and is opposite to the mounting opening (101). The air outlet grille (30) is arranged at the mounting opening (101) and is connected to the housing (10). The air guide part (40) is arranged in the accommodating cavity (102) and is located at the mounting opening (101); the air guide part (40) is connected to the housing (10) and extends along the circumferential direction of the mounting opening (101). The minimum radial dimension of the air guide part (40) is defined as D1, the minimum radial dimension of the air outlet grille (30) is defined as D2, and the minimum radial dimension D1 of the air guide part (40) and the minimum radial dimension D2 of the air outlet grille (30) satisfy: 0≤(D2-D1) / D1≤0.25, so as to reduce the obstruction of airflow by the air guide part (40).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present application claims priorities to Chinese patent application No. 202211228549.7, filed on October 9, 2022, and Chinese patent application No. 202310730929.9, filed on June 19, 2023, the entire contents of which are hereby incorporated by reference in their entireties.TECHNICAL FIELD

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

[0003] The air conditioner mainly includes an outdoor unit and an indoor unit. The air outlet of the outdoor unit is provided with an air outlet grille. In this way, external sundries can be prevented from entering the outdoor unit to affect the normal operation of the outdoor unit, and the user's hand can be prevented from touching the fan in the outdoor unit to cause a safety accident. Meanwhile, an air flow generated by a fan in the outdoor unit needs to reach the outdoor through the air outlet grille. The air outlet grille, as an important component of the outdoor unit, plays an important role in the operation of the outdoor unit.SUMMARY

[0004] An air conditioner is provided, which includes an indoor unit and an outdoor unit. The indoor unit includes an indoor heat exchanger. The outdoor unit includes a compressor, an outdoor heat exchanger, a housing, an outdoor fan, an air outlet grille and an air guide portion. The housing is provided with a mounting opening and a receiving cavity. The mounting opening communicates outside with the receiving cavity. The outdoor fan is disposed in the receiving cavity and opposite to the mounting opening. The air outlet grille is disposed at the mounting opening and connected to the housing. The air guide portion is disposed in the receiving cavity and located at the mounting opening. The air guide portion is connected to the housing and extends along a circumferential direction of the mounting opening. A minimum radial dimension of the air guide portion is defined as D 1 , a minimum radial dimension of the air outlet grille is defined as D 2 , and the D 1 and the D 2 satisfy: 0 ≤ (D 2 -D 1 ) / D 1 ≤ 0.25, so as to reduce an obstruction of the air guide portion to an air flow.BRIEF DESCRIPTION OF THE DRAWINGS

[0005] FIG. 1 is a structural diagram of an air conditioner according to some embodiments. FIG. 2 is a structural diagram of an outdoor unit according to some embodiments. FIG. 3 is a partial structural diagram of an outdoor unit according to some embodiments. FIG. 4 is a structural diagram of another outdoor unit according to some embodiments. FIG. 5 is a partial structural diagram of another outdoor unit according to some embodiments. FIG. 6 is a partial structural diagram of still another outdoor unit according to some embodiments. FIG. 7 is a partial structural diagram of yet still another outdoor unit according to some embodiments. FIG. 8 is a graph showing an influence of a value of (D 2 -D 1 ) / D 1 on an air volume in an outdoor unit according to some embodiments. FIG. 9 is a structural diagram of an air outlet grille according to some embodiments. FIG. 10 is a structural diagram of another air outlet grille according to some embodiments. FIG. 11 is a structural diagram of still another air outlet grille according to some embodiments. FIG. 12 is a partial structural diagram of yet still another outdoor unit according to some embodiments. FIG. 13 is an enlarged view of a portion of circle S in FIG. 12. FIG. 14 is an enlarged view of a portion of circle Z in FIG. 12. FIG. 15 is a partial structural diagram of yet still another outdoor unit according to some embodiments. FIG. 16 is a simulation diagram of pressure distribution at an air outlet of an outdoor unit according to some embodiments. FIG. 17 is a simulation diagram of pressure distribution at an air outlet of another outdoor unit according to some embodiments. FIG. 18 is a partial structural diagram of an air outlet grille according to some embodiments. FIG. 19 is a simulation result diagram of a blocking force of an air outlet grille to an air flow according to some embodiments. FIG. 20 is a simulation result diagram of a blocking force of another air outlet grille to an air flow according to some embodiments. FIG. 21 is a simulation result diagram of a blocking force of still another air outlet grille to an air flow according to some embodiments. FIG. 22 is a simulation result diagram of a blocking force of yet still another air outlet grille to an air flow according to some embodiments. FIG. 23 is a partial structural diagram of yet still another outdoor unit according to some embodiments. FIG. 24 is an enlarged view of a portion of circle Y in FIG. 23. FIG. 25 is a partial structural diagram of another air outlet grille according to some embodiments. FIG. 26 is a simulation result diagram of a blocking force of yet still another air outlet grille to an air flow according to some embodiments. FIG. 27 is a simulation result diagram of a blocking force of yet still another air outlet grille to an air flow according to some embodiments. FIG. 28 is a partial structural diagram of yet still another outdoor unit according to some embodiments.

[0006] Reference numerals: 100, air conditioner; 1, outdoor unit; 10, housing; 11, panel; 111, first panel body ; 112, second panel body; 113, third panel body; 101, mounting opening; 102, receiving cavity; 20, outdoor fan; 201, fan blade; 202, motor; 30, air outlet grille; 301, grille bar; 3011, first grille bar; 30111, first rib; 30112, second rib; 3012, second grille bar; 30121, first sub-grille bar; 30121E, first connecting portion; 30121F, second connecting portion; 30122, second sub-grille bar; 30123, first circumferential rib; 30124, second circumferential rib; 30125, third circumferential rib; 30126, fourth circumferential rib; 30127, fifth circumferential rib; 30128, Sixth circumferential rib; 3013, air guide surface; 30131, first side edge; 30132, second side edge; 302, fixing portion; 3021, through hole; 40, air guide portion; 401, first sub-air guide portion; 4011, inner circumferential surface; 402, second sub-air guide portion; 2, indoor unit.DETAILED DESCRIPTION OF THE EMBODIMENTS

[0007] Some embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some but not all of the embodiments of the present disclosure. Based on the embodiments provided by the present disclosure, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of the present disclosure.

[0008] Unless the context otherwise requires, in the entire specification and claims, the term "include" and its other forms such as the third person singular form "includes" and the present participle form "including" are construed as open and inclusive, that is, "includes, but is not limited to" . In the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example " "specific example" or "some examples" and the like are intended to indicate that specific features, structures, materials, or characteristics related to this embodiment or example are included in at least one embodiment or example of the present disclosure. The illustrative expression of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described herein may be combined in a suitable manner in any one or more embodiments or examples.

[0009] Hereinafter, the terms "first" and "second" are only intended for illustrative purposes, rather than being construed as indicating or implying relative importance or implicitly designating the number of the technical features as indicated. Thus, the features modified by "first" and "second" may explicitly or implicitly include one or more said feature. In the illustrations of the present disclosure, the term "a plurality of" means two or more, unless otherwise specifically defined.

[0010] When describing some embodiments, expressions such as "coupling" and "connection" and its derivatives may be used. The term "connection" shall be construed broadly, for example, "connection" may be a fixed connection, a detachable connection, or an integral connection. It can be a direct connection or an indirect connection through an intermediate medium. The term "coupling" indicates, for example, direct physical or electrical contact of two or more components. The term "coupling" or "communicatively coupled" may also indicates that two or more components 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 content herein.

[0011] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0012] The use of "adapted to" or "configured to" herein implies an open and inclusive language, which does not exclude devices that are adapted or configured to perform additional tasks or steps.

[0013] As shown in FIG. 1, in some embodiments, an air conditioning system 100 includes an outdoor unit 1 and an indoor unit 2.

[0014] In some embodiments, the air conditioner 100 further includes an expansion valve configured to regulate a flow rate of refrigerant within a pipeline of the air conditioning system 100.

[0015] In some embodiments, the indoor unit 2 includes an indoor heat exchanger and an indoor fan. The outdoor unit 1 includes an outdoor heat exchanger and a compressor.

[0016] The compressor, an condenser (the indoor heat exchanger or the outdoor heat exchanger), the expansion valve (an indoor expansion valve and an outdoor expansion valve) and an evaporator (the outdoor heat exchanger or the indoor heat exchanger) perform a refrigerant cycle of the air conditioning system 100. The refrigerant cycle consists of a series of processes involving compression, condensation, expansion and evaporation, and cyclic supply of refrigerant to a regulated side.

[0017] When the air conditioner 100 operates in a heating mode, a gas-phase refrigerant in a low temperature and low pressure state becomes a gas-phase refrigerant in a high temperature and high pressure state after being compressed by the compressor, and the gas-phase refrigerant in the high temperature and high pressure state flows into the indoor heat exchanger. The indoor heat exchanger condenses the gas-phase refrigerant in the high temperature and high pressure state into a liquid-phase refrigerant in a high-pressure state, and the heat is released to the surrounding environment along with the condensation process, so as to increase the temperature of the indoor air. After being throttled by the expansion valve, the pressure of the liquid-phase refrigerant in the high-pressure state is reduced, and the liquid-phase refrigerant in the high-pressure state is changed into a gas-liquid two-phase refrigerant in a low-pressure state. The outdoor heat exchanger evaporates the gas-liquid two-phase refrigerant in the low-pressure state to form the gas-phase refrigerant in the low-temperature and low-pressure state, and the gas-phase refrigerant in the low-temperature and low-pressure state returns to the compressor to form a heating cycle.

[0018] When the air conditioner 100 operates in a cooling mode, the gas-phase refrigerant in the high temperature and high pressure state discharged by the compressor flows into the outdoor heat exchanger. The outdoor heat exchanger condenses the gas-phase refrigerant in the high temperature and high pressure state into a subcooled liquid-phase refrigerant in a medium temperature and high-pressure state. The expansion valve converts the subcooled liquid-phase refrigerant in the medium-temperature and high-pressure state into the gas-liquid two-phase refrigerant in a low-temperature and low-pressure state after throttling and depressurizing. The indoor heat exchanger evaporates the gas-liquid two-phase refrigerant in the low-temperature and low-pressure state to form the gas-phase refrigerant in the low-temperature and low-pressure state, and absorbs heat from the surrounding environment during evaporation, so as to reduce the temperature of the indoor air. The gas-phase refrigerant in the low-temperature and low-pressure state returns to the compressor to form a refrigeration cycle.

[0019] In some embodiments, during operation of the air conditioner 100, the outdoor unit 1 includes an air outlet grille and an air guide portion. The air guide portion cooperates with the air outlet grille at an air outlet of the outdoor unit. The outdoor unit 1 outputs an air flow formed by the air after heat exchange to the outdoor environment through the air outlet grille. The air outlet grille can prevent foreign matters, which may affect the normal operation of the outdoor unit 1, from entering the outdoor unit 1. The air outlet grille can also avoid direct contact between a user and an outdoor fan of the outdoor unit 1, thereby improving the safety performance of the outdoor unit 1.

[0020] However, the air outlet grille would cause a blocking force to the air flow blown out from the outdoor unit 1, which results in a loss of the air volume of the outdoor unit 1 and affects the overall performance of the outdoor unit 1. In addition, a cooperation portion between the air outlet grille and the air guide portion would also generate a blocking force to the air flow blown out from the outdoor unit 1.

[0021] In the related art, in the design and production of the outdoor unit, a method of optimizing an inclination angle and a shape of grille bars of the air outlet grille, and spacing between the grille bars is usually used to reduce the blocking force caused by the air outlet grille to the air flow blown by the outdoor fan of the outdoor unit. For example, in order to reduce the production cost, the air outlet grille of the outdoor unit in the related art is usually made of a plastic material. However, due to the requirements of mold processing and installation specifications, for example, the parameters such as a height and a length of the grille bar of the air outlet grille made of plastic material will be limited, and it is difficult to design the grille bar structure of the air outlet grille completely according to an air outlet direction of the outdoor fan, resulting in the blocking force of the air outlet grille to the air flow blown by the fan is still large. In order to meet the demand of the air volume blown from the outdoor unit, the rotation speed of the outdoor fan needs to be increased, which means that the power of the outdoor fan would be increased and the operation cost of the outdoor unit would be increased.

[0022] To solve the above problems, some embodiments of the present disclosure provide an air conditioner 100, which includes an outdoor unit 1. The outdoor unit 1 includes an air guide portion and an air outlet grille. In some embodiments of the present disclosure, a minimum radial dimension of the air guide portion is defined as D 1 , and a minimum radial dimension of the air outlet grille is defined as D 2 . D 1 and D 2 satisfy: 0 ≤ (D 2 -D 1 ) / D 1 ≤ 0.25. In this way, the obstruction to the air flow caused by the air guide portion can be reduced.

[0023] As shown in FIG. 2, the outdoor unit 1 includes a housing 10. In some embodiments of the present disclosure, the housing 10 includes a mounting opening 101 and a receiving cavity 102. The mounting opening 101 is formed on the housing 10. The receiving cavity 102 is defined by the housing 10. The receiving cavity 102 can communicate with the outside of the housing 10 through the mounting opening 101.

[0024] The outdoor unit 1 further includes an outdoor fan 20. The outdoor fan 20 is disposed in the receiving cavity 102 and corresponds to the mounting opening 101. In some embodiments of the present disclosure, the outdoor fan 20 includes a motor 202 and at least one fan blade 201. The at least one fan blade 201 is connected to the motor 202 and disposed at intervals along an axial direction of the motor 202. The motor 202 is connected to the housing 10, and configured to drive the at least one fan blade 201 to rotate. In some embodiments of the present disclosure, the at least one fan blade 201 is disposed corresponding to the mounting opening 101.

[0025] The outdoor unit 1 further includes an air outlet grille 30. The air outlet grille 30 is disposed at the mounting opening 101 and is configured to cover the mounting opening 101. When the air outlet grille 30 covers the mounting opening 101, the air outlet grille 30 is connected to the housing 10.

[0026] The outdoor unit 1 further includes an air guide portion 40. The air guide portion 40 is disposed in the receiving cavity 102 and is located at the mounting opening 101. The air guide portion 40 is connected to the housing 10 and extends along the circumferential direction of the mounting opening 101.

[0027] It should be understood that the outdoor air is composed of a large number of particles (such as various gas molecules, dust, etc.), which are suspended in the air. A large number of particles are free to move in the air without external force.

[0028] As shown in FIG. 3, in some embodiments of the present disclosure, when the outdoor fan 20 operates, the at least one fan blade 201 rotates along a shaft of the motor 202, and collides with particles in the air. the collided particles are converted from free movement to rapid movement in a preset direction, thereby generating an air flow.

[0029] The air in the front (for example, in a direction represented by M in FIG. 3) of the at least one fan blade 201 is constantly blown away, and is blown out of the outdoor unit 1 after passing through the air guide portion 101 and the air outlet grille 30, so that a low pressure area is formed in the front of the at least one fan blade 201. In this case, a pressure difference is formed between the front of the at least one fan blade 201 and the rear (for example, in a direction represented by N in FIG. 3) of the at least one fan blade 201. Under the effect of the pressure difference, the air in the rear of the at least one fan blade 201 flows toward the front of the at least one fan blade 201.

[0030] Since the at least one fan blade 201 continues to rotate, the at least one fan blade 201 blows the air in the front of the at least one fan blade 201 away again, and the air in the rear of the at least one fan blade 201 flows toward the front of the at least one fan blade 201 again, through such a cycle, a continuous air flow is formed.

[0031] The at least one fan blade 201 includes an impeller surface. In some embodiments of the present disclosure, an initial direction of the air flow generated by the operation of the outdoor fan 20 is perpendicular to a plane where the impeller surface of the at least one fan blade 201 is located.

[0032] It should be noted that the front of the at least one fan blade 201 is a side thereof facing the air outlet grille 30, and the rear of the at least one fan blade 201 is a side thereof facing away from the air outlet grille 30.

[0033] As shown in FIG. 3, in some embodiments of the present disclosure, the air outlet grille 30 includes at least one grille bar 301 and a fixing portion 302. The fixing portion 302 extends in a circumferential direction of the air outlet grille 30 and is connected to the housing 10. The fixing portion 302 is configured to support and fix the air outlet grille 30. The at least one grille bar 301 is disposed in the fixing portion 302 and connected to the fixing portion 302.

[0034] In some embodiments of the present disclosure, after flowing out of the air guide portion 40, the air flow is divided into a first portion of the air flow and a second portion of the air flow. The first portion of the air flow, for example the air flow of the portion A in FIG. 3, is blown onto the air outlet grille 30. When the air outlet grille 30 includes a plurality of grille bars 301, the first portion of the air flow is blown out of the outdoor unit 1 from a gap between any two of the plurality of grille bars 301 of the air outlet grille 30. The second portion of the air flow, for example the air flow of the portion B in FIG. 3, is blown onto at least one grille bar 301 and an edge of the air outlet grille. Since the second portion of the air flow is subjected to the blocking force of the at least one grille bar 301 and the edge the air outlet grille 30, the air volume blown out of the outdoor unit 1 is lost and reduced.

[0035] As shown in FIG. 4 and FIG. 5, in some embodiments of the present disclosure, a minimum radial dimension of the air guide portion 40 is defined as D 1 , and a minimum radial dimension of the air outlet grille 30 is defined as D 2 . D 1 and D 2 satisfy: 0 ≤ (D 2 -D 1 ) / D 1 ≤ 0.25. In this way, the minimum radial dimension D 2 of the air outlet grille 30 is greater than the minimum radial dimension D 1 of the air guide portion 40, so that the air flow generated by the fan 20 reaches the air outlet grille 30 under the guidance of the air guide portion 40, and the air flow is not obstructed by the air guide portion 40 or the housing 10 before reaching the air outlet grille 30.

[0036] It should be noted that, as shown in FIG. 6, when D 1 and D 2 satisfy: (D 2 -D 1 ) / D 1 < 0, the minimum radial dimension D 2 of the air outlet grille 30 is less than the minimum radial dimension D 1 of the air guide portion 40, the air outlet grille 30 is connected to the mounting opening 101, and the minimum radial dimension of the mounting opening 101 may be regarded as the minimum radial dimension D 2 of the air outlet grille 30. In this case, the minimum radial dimension D 2 of the mounting opening 101 is less than the minimum radial dimension D 1 of the air guide portion 40. After the air flow generated by the outdoor fan 20 flows out of the air guide portion 40, a third portion of the air flow (for example the air flow of the portion C in FIG. 6) is formed, and the third portion of the air flow is blown onto the housing 10. Since the housing 10 is made of airtight plate, the third portion of the air flow cannot be blown out through the housing 10, which increases the blocking force of the air flow and the air volume loss, thus, the air volume output of the indoor unit 1 decreases.

[0037] As shown in FIG. 7, when D 1 and D 2 satisfy: (D 2 -D 1 ) / D 1 >0.25, the minimum radial dimension D 2 of the air outlet grille 30 is greater than the minimum radial dimension D 1 of the air guide portion 40. As the minimum radial dimension D 2 of the air outlet grille 30 increases with respect to the minimum radial dimension D 1 of the air guide portion 40, the air volume blown out from the gap between any two of the at least one grille bar 301 of the air outlet grille 30 no longer increases. That is, the air volume blown to the edge of the air outlet grille 30 no longer decreases, which has no significant effect on reducing the blocking force of the air outlet grille 30 to the air flow. Moreover, in this case, as the minimum radial dimension D 2 of the air outlet grille 30 continues to increase with respect to the minimum radial dimension D 1 of the air guide portion 40, the production cost of the air outlet grille 30 would be increased and the strength of the air outlet grille 30 would be reduced. As shown in FIG. 8, in some embodiments of the present disclosure, when D 1 and D 2 satisfy: 0.05 ≤ (D 2 -D 1 ) / D 1 ≤ 0.15, an exponent of the increase amount of the air flow blown by the outdoor fan 20 onto the at least one grille bar 301 of the air outlet grille 30 is increased, so that the reduction effect on the blocking force of the air outlet grille 30 is more significant after the air flow generated by the outdoor fan 20 is guided by the air guide portion 40 and blown onto the air outlet grille 30. Under the premise of controlling the production cost and ensuring the strength of the air outlet grille 30, the blocking force of the air outlet grille 30 to the air flow blown by the outdoor fan 20 can be further reduced.

[0038] In some embodiments of the present disclosure, the minimum radial dimension D 2 of the air outlet grille 30 increases, and the minimum radial dimension D 1 of the air guide portion 40 remains unchanged, so that the minimum radial dimension D 2 of the air outlet grille 30 increases relative to the minimum radial dimension D 1 of the air guide portion 40. In this way, a coverage area of the air flow blown onto the air outlet grille 30 through the guide of the air guide portion 40 remains unchanged, and an area of the air outlet grille 30 is increased, so that a part of the second portion of the air flow originally blown to the edge of the air outlet grille 30 (for example the air flow of the portion B in FIG. 3) can be blown to the at least one grille bar 301 of the air outlet grille 30 (for example the air flow of portion B in FIG. 5), and blown out of the outdoor unit 1 through the gap between any two grille bars 301 in the at least one grille bar 301 of the air outlet grille 30. In this way, the blocking force of the air outlet grille 30 to the second portion of the air flow can be reduced, thereby reducing the blocking force of the air outlet grille 30 to the air flow blown by the fan 20.

[0039] In other embodiments of the present disclosure, the minimum radial dimension D 2 of the air outlet grille 30 remains unchanged, and the minimum radial dimension D 1 of the air guide portion 40 decreases, so that the minimum radial dimension D 2 of the air outlet grille 30 increases relative to the minimum radial dimension D 1 of the air guide portion 40. In this way, the coverage area of the air flow blown onto the air outlet grille 30 through the guide of the air guide portion 40 is decreased, and the area of the air outlet grille 30 remains unchanged, so that a part of the second portion of the air flow originally blown to the edge of the air outlet grille 30 can be blown to the at least one grille bar 301 of the air outlet grille 30, and blown out of the outdoor unit 1 through the gap between any two grille bars 301 in the at least one grille bar 301 of the air outlet grille 30. In this way, the blocking force of the air outlet grille 30 to the second portion of the air flow can be reduced, thereby reducing the blocking force of the air outlet grille 30 to the air flow blown by the outdoor fan 20.

[0040] In some embodiments of the present disclosure, the minimum radial dimension D 2 of the air outlet grille 30 increases, and the minimum radial dimension D 1 of the air guide portion 40 decreases, so that the minimum radial dimension D 2 of the air outlet grille 30 increases relative to the minimum radial dimension D 1 of the air guide portion 40. In this way, the coverage area of the air flow blown onto the air outlet grille 30 through the guide of the air guide portion 40 is decreased, and the area of the air outlet grille 30 is increased, so that a part of the second portion of the air flow originally blown to the edge of the air outlet grille 30 can be blown to the at least one grille bar 301 of the air outlet grille 30, and blown out of the outdoor unit 1 through the gap between any two grille bars 301 in the at least one grille bar 301 of the air outlet grille 30. In this way, the blocking force of the air outlet grille 30 to the second portion of the air flow can be reduced, thereby reducing the blocking force of the air outlet grille 30 to the air flow blown by the outdoor fan 20. As shown in FIG. 9 to FIG. 11, in some embodiments of the present disclosure, the air outlet grille 30 further includes a supporting portion 303. The supporting portion 303 is coaxially disposed with the air outlet grille 30 and configured to support the at least one grille bar 301.

[0041] As shown in FIG. 9, in some embodiments of the present disclosure, the at least one grille bar 301A of the air outlet grille 30A includes at least one first grille bar 3011A and at least one second grille bar 3012A. An end of the at least one first grille bar 3011A is connected to the supporting portion 303A. The other end of the at least one first grille bar 3011A extends along a radial direction of the air outlet grille 30A or extends at a predetermined included angle with the radial direction of the air outlet grille 30A, and is connected to the fixing portion 302A of the air outlet grille 30A. The at least one first grille bar 3011A has a same length in the radial direction of the air outlet grille 30A. The at least one second grille bar 3012A is spaced apart around an axial center of the air outlet grille 30A. When the at least one grille bar 301A includes a plurality of second grille bars 3012A, the plurality of second grille bars 3012A are distributed at intervals along the radial direction of the air outlet grille 30A. The at least one first grille bar 3011A is connected to each second grille bar 3012A.

[0042] In this case, the minimum radial dimension D 2 of the air outlet grille 30A is the radial dimension of the air outlet grille 30A.

[0043] As shown in FIG. 10, in other embodiments of the present disclosure, the at least one grille bar 301B of the air outlet grille 30B includes at least one first grille bar 3011B and at least one second grille bar 3012B. An end of the at least one first grille bar 3011B is connected to the supporting portion 303B. The other end of the at least one first grille bar 3011B extends toward the fixing portion 302B, and is connected to the fixing portion 302B. The at least one first grille bar 3011B protrudes in the circumferential direction of the air outlet grille 30B, which is a direction X in FIG. 10. The at least one second grille bar 3012B is disposed around a center of the air outlet grille 30B. When the at least one grille bar 301B includes a plurality of second grille bars 3012B, the plurality of second grille bars 3012B are distributed at intervals along the radial direction of the air outlet grille 30B. The at least one first grille bar 3011B is connected to each second grille bar 3012B.

[0044] Unlike the air outlet grille 30A in FIG. 9, the air outlet grille 30B includes a minor axis and a major axis. The minor axis is an axis with the shortest radial dimension of the air outlet grille 30B. The major axis is an axis with the longest radial dimension of the air outlet grille 30B.

[0045] In this case, a dimension of the minor axis of the air outlet grille 30B is defined as D 2 , a dimension of the major axis is defined as D 4 , and the minimum radial dimension of the air outlet grille 30 is defined as the dimension D 2 of the minor axis.

[0046] As shown in FIG. 11, in other embodiments of the present disclosure, the at least one grille bar 301C of the air outlet grille 30C includes at least one first grille bar 3011C and at least one second grille bar 3012C. The at least one first grille bar 3011C is connected to the supporting portion 303C. When the at least one first grille bar 3011C includes a plurality of first grille bars 3011C, two of the plurality of first grille bars 3011C are connected to the fixing portion 302C to form a closed area, and the at least one second grille bar 3012C is disposed in the closed area. The at least one second grille bar 3012C includes a first sub-grille bar 30121 and a second sub-grille bar 30122. An end of the first sub-grille bar 30121 is connected to the fixing portion 302C, and the other end is connected to one first grille bar 3011C of two adjacent first grille bars 3011C. An end of the second sub-grille bar 30122 is connected to the fixing portion 302C, and the other end is connected to the other first grille bar 3011C of the two adjacent first grille bars 3011C. The first sub-grille bar 30121 and the second sub-grille bar 30122 are cross-connected.

[0047] In some embodiments of the present disclosure, the first sub-grille bar 30121 includes a first connecting portion 30121E and a second connecting portion 30121F. The first connecting portion 30121E is a straight line segment, and the first sub-grille bar 30121 is connected to the fixing portion 302C through the first connecting portion 30121E. The second connecting portion 30121F is an arc segment, and the first sub-grille bar 30121 is connected to the first grille bar 3011C through the second connecting portion 30121F.

[0048] In this case, the minimum radial dimension D 2 of the air outlet grille 30C is a radial dimension of the air outlet grille 30C.

[0049] It should be noted that, in some embodiments of the present disclosure, the minimum radial dimension D 2 of the air outlet grille 30 satisfies: 400 mm ≤ D 2 ≤ 800 mm ∘

[0050] In some embodiments of the present disclosure, as shown in FIG. 12 and FIG. 13, the dimension of the second grille bar 3012 in the axial direction of the fixing portion 302 is defined as a first dimension H 1 . The dimension of the first grille bar 3011 in the axial direction of the fixing portion 302 is defined as a second dimension H 2 . The first dimension H 1 satisfies: H 1 ≥ 6 mm. In this way, the demolding requirement of the air outlet grille 30 can be ensured.

[0051] In some embodiments of the present disclosure, the first dimension H 1 also satisfies: 0.011 ≤ H 1 / D 2 ≤ 0.014. The second dimension H 2 satisfies: 0.011 ≤ H 2 / D 2 ≤ 0.014. In this way, when the size of the air outlet grille 30 is determined, the length of the second grille bar 3012 and the length of the first grille bar 3011 in the axial direction of the fixing portion 302 is reduced, so that a length of the path through which the air flow flows through the gaps between the plurality of grille bars 301 of the air outlet grille 30 is reduced, thereby reducing the blocking force to the air flow in the process of flowing through the air outlet grille 30, and further reducing the blocking force of the air outlet grille 30 to the air flow blown by the outdoor fan 20 of the outdoor unit 1, so that the operating power of the outdoor fan 20 can be reduced, and the operating cost of the outdoor unit 1 can be reduced.

[0052] In some embodiments of the present disclosure, the second dimension H 2 and the first dimension H 1 satisfy: H 2 < H 1 . An end of the first grille bar 3011 away from the outdoor fan 20 is connected to a side, which is adjacent to the outdoor fan 20, of an end of the second grille bar 3012 away from the outdoor fan 20. An end of the first grille bar 3011 adjacent to the outdoor fan 20 is connected to a side, which is away from the outdoor fan 20, of an end of the second grille bar 3012 adjacent to the outdoor fan 20. For example, when the second dimension H 2 is 0.4 mm smaller than the first dimension H 1 , a distance between an end surface of the end of the first grille bar 3011 away from the outdoor fan 20 and an end surface of the end of the second grille bar 3012 away from the outdoor fan 20 is 0.2 mm, and a distance between an end surface of the end of the first grille bar 3011 adjacent to the outdoor fan 2 and an end surface of the end of the second grille bar 3012 adjacent to the outdoor fan 2 is 0.2 mm. In this way, the connection between the first grille bar 3011 and the second grille bar 3012 can be tighter, thereby increasing the structural strength of the air outlet grille 30.

[0053] As shown in FIG. 5, the motor 202 drives the at least one fan blade 201 to rotate. A diameter of the largest circle formed by rotating a point of the at least one fan blade 201 that is farthest from the axis of the outdoor fan 20 around the axis of the outdoor fan 20 is defined as D 3 . D 3 and D 1 satisfy: 0.02 ≤ (D 1 -D 3 ) / D 3 ≤ 0.1, and D 1 -D 3 ≥ 12mm. In this way, the diameter D 3 of the largest circle formed by the rotation of the at least one fan blade 201 can be smaller than the minimum radial dimension D 1 of the air guide portion 40, so as to meet the assembly requirements of the at least one fan blade 201, so that the at least one fan blade 201 can be mounted in the air guide portion 40 without colliding with the air guide portion 40 during operation. In addition, the air flow generated by the at least one fan blade 201 may not be excessively dispersed, so that the air flow generated by the fan 20 does not collide too much with the air guide portion 40, the housing 10, and the air outlet grille 30, thereby reducing the blocking force to the air flow and the loss of the air volume.

[0054] When D 3 and D 1 satisfy (D 1 -D 3 ) / D 3 < 0.02, the at least one fan blade 201 cannot be mounted in the air guide portion 40 so that the assembly requirements of the at least one fan blade 201 cannot be satisfied.

[0055] When D 3 and D 1 satisfy (D 1 -D 3 ) / D 3 > 0.1, the diameter D 3 of the largest circle formed by the rotation of the at least one fan blade 201 is smaller than the minimum radial dimension D 1 of the air guide portion 40. In this case, the air flow generated by the at least one fan blade 201 is excessively dispersed, so that the air flow generated by the at least one fan blade 201 collides with the air guide portion 40, the housing 10, and the air outlet grille 30 excessively, thereby increasing the blocking force to the air flow and the loss of the air volume.

[0056] In some embodiments of the present disclosure, as shown in FIG. 5, the dimension of the fixing portion 302 in the axial direction of the mounting opening 101 is L 1 , where L 1 satisfies: 5 mm ≤ L 1 ≤ 60 mm.

[0057] It should be noted that when L 1 is less than 5 mm, the axial dimension of the fixing portion 302 is too small, the difficulty of production of the fixing portion 302 is increased, and the strength of the fixing portion 302 is reduced, so that the fixing portion 302 is easily damaged during use of the indoor unit 1.

[0058] When L 1 is more than 60 mm, the distance between the air outlet grille 30 and the fan 20 is excessively large, which causes the air flow blown onto the air outlet grille 30 to be excessively dispersed, thereby resulting in the increase of the blocking force to the air flow and the loss of the air volume.

[0059] In some embodiments of the present disclosure, as shown in FIG. 5 and FIG. 15, the air guide portion 40 includes a first sub-air guide portion 401 and a second sub-air guide portion 402. The first sub-air guide portion 401 is connected to the second sub-air guide portion 402. The first sub-air guide portion 401 is connected to the housing 10. The second sub-air guide portion 402 is disposed on a side of the first sub-air guide portion 401 away from the housing 10. A radial dimension of the first sub-air guide portion 401 gradually decreases in its direction toward the second portion 402.

[0060] The first sub-air guide portion 401 of the air guide portion 40 guides the air flow blown by the fan 20, so that the air flow can be blown toward the air outlet grille 30, thereby reducing the collision between the air flow and the air guide portion 40, further reducing the blocking force to the air flow, and increasing the air volume of the outdoor unit 1.

[0061] In some embodiments of the present disclosure, as shown in FIG. 5, the dimension of the first sub-air guide portion 401 in the axial direction of the mounting opening 101 is defined as L 2 , and L 2 satisfies: 0 < L 2 ≤ 20 mm. In this case, the air flow blown by the outdoor fan 20 may be blown to the air outlet grille 30 along the first sub-air guide portion 401, and the air flow is not excessively dispersed after being guided by the first sub-air guide portion 401, which would result in the increase of the air volume blown to the fixing portion 302 of the air outlet grille 30, thereby increasing the blocking force to the air flow and the loss of the air volume.

[0062] It should be noted that when L 2 is more than 20 mm, the first sub-air guide portion 401 causes the air flow blown by the outdoor fan 20 to be excessively dispersed after being guided by the first sub-air guide portion 401, which would result in the increase of the air volume blown to the fixing portion 302 of the air outlet grille 30, thereby increasing the blocking force to the air flow and the loss of the air volume.

[0063] As shown in FIG. 15, the first sub-air guide portion 401 of the air guide portion 40 includes an inner circumferential surface 4011. The inner circumferential surface 4011 is a circumferential surface of the first sub-air guide portion 401 facing the mounting opening 101. An included angle between a normal line of the inner circumferential surface 4011 and an axis of the mounting opening 101 is defined as α, where α satisfies: 75° ≤ α < 90°. For example, α can be 75°, 80°, 85°, or 90°. In this way, the first sub-air guide portion 401 can guide the air flow blown by the outdoor fan 20 toward the air outlet grille 30 along the inner circumferential surface 4011, thereby reducing the collision between the air flow and the air guide portion 40, further reducing the blocking force to the air flow, and increasing the air volume of the outdoor unit 1. It should be noted that the axis of the mounting opening 101 may refer to a direction parallel to the axis of the mounting opening 101.

[0064] It should be noted that, when α is less than 75°, the air flow blown by the outdoor fan 20 is excessively dispersed after being guided by the inner circumferential surface 4011 of the first sub-air guide portion 401, which would result in the increase of the air volume blown to the fixing portion 302 of the air outlet grille 30, thereby increasing the blocking force to the air flow and the loss of the air volume.

[0065] When α is equal to 90°, the inner circumferential surface 4011 of the first sub-air guide portion 401 will extend along the central axis of the mounting opening 101 in a direction away from the receiving cavity 102, thereby losing the function of guiding the air flow to disperse, which would cause the air flow to blow onto the air guide portion 40, and collide with the air guide portion 40. In this case, the blocking force of the air guide portion 40 would increase, thereby increasing the loss of the air volume of the outdoor unit 1.

[0066] When α is more than 90°, the radial dimension of the first sub-air guide portion 401 gradually increases in its direction toward the second sub-air guide portion 402. The inner circumferential surface 4011 of the first sub-air guide portion 401 makes the air flow blown by the fan 20 concentrate toward the central axis of the mounting opening 101, so that the inner circumferential surface 4011 of the first sub-air guide portion 401 blocks the air flow blown by the fan 20, thereby increasing the blocking force to the air flow and the loss of the air volume.

[0067] In some embodiments of the present disclosure, the minimum radial dimension of the second sub-air guide portion 402 is the minimum radial dimension D 1 of the air guide portion 40.

[0068] It should be understood that the minimum radial dimension D 2 of the air outlet grille 30 is a radial dimension of a circle having the smallest radius among circles each formed by each point on the fixing portion 302 of the air outlet grille 30 rotating around the center of the air outlet grille 30. The minimum radial dimension D 1 of the air guide portion 40 corresponding to the air outlet grille 30 is a radial dimension of a circle having the smallest radius among circles each formed by each point on the edge of the air guide portion 40 rotating around the center of the air guide portion 40.

[0069] As shown in FIG. 16, when the dimensional relationship between the air guide portion 40 and the air outlet grille 30 is not improved, the pressure at the fixing portion 302 of the air outlet grille 30 (position D in FIG. 8) is, for example, 5 Pa. In this case, the air outlet grille 30 has a large blocking force to the air flow.

[0070] As shown in FIG. 17, after the dimensional relationship between the air guide portion 40 and the air outlet grille 30 is improved, a part of the second portion of the air flow originally blown to the fixing portion 302 of the air outlet grille 30 can be blown to the at least one grille bar 301 of the air outlet grille 30, and blown out of the outdoor unit 1 through the gap between any two grille bars 301 in the at least one grille bar 301 of the air outlet grille 30. In this case, the pressure at the fixing portion 302 of the air outlet grille 30 (position D as shown in FIG. 7) is approximately 0 Pa. In this way, the pressure received at the fixing portion 302 of the air outlet grille 30 is reduced, so that the blocking force of the air outlet grille 30 to a part of the second portion of the air flow is reduced, and the problem of high blocking force of the air outlet grille 30 to the air flow blown by the fan 20 is resolved.

[0071] As shown in FIG. 18, the included angle between extending directions of two adjacent first grille bars 3011 in the plurality of first grille bars 3011 is defined as β, where β satisfies: 7° ≤ β < 11°. For example, β is 7°, 8°, 9°, 10° or 11°. In this way, the support of the first grille bar 3011 to the at least one second grille bar 3012 can be satisfied, so as to ensure that the at least one second grille bar 3012 is not easily deformed in its radial direction. On the premise of satisfying the requirements of the mold processing and mounting specifications, the number of the first grille bars 3011 of the air outlet grille 30 is reduced, thereby reducing the blocking force of the first grille bars 3011 to the air flow blown by the outdoor fan 20.

[0072] It should be noted that included angles β between extending directions of two adjacent first grille bars 3011 in the plurality of first grille bars 3011 may or may not be equal. In some embodiments of the present disclosure, the included angles β between extending directions of two adjacent first grille bars 3011 in the plurality of first grille bars 3011 are equal, that is, the plurality of first grille bars 3011 are equally spaced along the circumferential direction of the fixing portion 302.

[0073] As shown in FIG. 18, in some embodiments of the present disclosure, the at least one first grille bar 3011 includes at least one first rib 30111 and at least one second rib 30112. the at least one first rib 30111 and the at least one second rib 30112 are arranged at intervals alternatively in the circumferential direction of the fixing portion 302. The at least one first rib 30111 and the at least one second rib 30112 extend in the radial direction of the fixing portion 302, and the length of the at least one first rib 30111 is greater than the length of the at least one second rib 30112.

[0074] An end of the at least one first rib 30111 and an end of the at least one second rib 30112 are connected to the fixing portion 302. The other end of the at least one first rib 30111 is connected to the supporting portion 303. The at least one first rib 30111 is cross-connected to the plurality of second grille bars 3012.

[0075] In this way, it is possible to solve the problem that when the at least one first grille bar 301 is connected to all the second grille bars 302, due to the small diameter of the at least one second grille bar 302 adjacent to the supporting portion 303, the gap between the two adjacent first grille bars 301 near the supporting portion 303 is small, thereby causing a large blocking force to the air flow blown by the outdoor fan 20.

[0076] In some embodiments of the present disclosure, the distance from the axial center of the fixing portion 302 to the end of the second rib 30112 away from the fixing portion 302 is defined as a first distance L 3 , and the first distance L 3 satisfies: 0.55 ≤ 2L 3 / D 2 ≤ 0.7.

[0077] It should be noted that the ratio of the first distance L 3 to the radius of the fixing portion 302 (that is, half of the minimum radial dimension D 2 of the air outlet grille 30) may increase with the increase of the minimum radial dimension D 2 of the air outlet grille 30.

[0078] In the case where the minimum radial dimension D 2 of the air outlet grille 30 is determined, the range of the first distance L 3 is determined by the above conditions, and the length range of the second rib 30112 is determined by the minimum radial dimension D 2 of the air outlet grille 30A and the range of the first distance L 3 . In this way, the length of the second rib 30112 can be reduced, and the requirements of the mold processing and mounting specifications can be satisfied. Moreover, by reducing the length of the second rib 30112, the blocking force of the second rib 30112 to the air flow in the air outlet grille 30 can be further reduced, so that the blocking force of the air outlet grille 30 to the air flow blown by the fan 20 can be further reduced.

[0079] In some embodiments of the present disclosure, as shown in FIG. 18, the plurality of second grille bars 3012 further includes a first circumferential rib 30123, a second circumferential rib 30124, and a third circumferential rib 30125.

[0080] Among the plurality of second grille bars 3012 between the fixing portion 302 and the supporting portion 303, one second grille bar 3012 adjacent to the fixing portion 302 is the first circumferential rib 30123, and the first circumferential rib 30123 is connected to each first grille bar 3011. One of the plurality of second grille bars 3012 between the end of the second rib 30112 away from the fixing portion 302 and the axial center of the air outlet grille 30, which is adjacent to the fixing portion 302, is the second circumferential rib 30124. The third circumferential rib 30125 is connected to the end of the second rib 324 away from the fixing portion 302, and the third circumferential rib 30125 and the second circumferential rib 30124 are adjacent to each other and spaced apart in the radial direction of the air outlet grille 30.

[0081] The distance between any two adjacent second grille bars 3012 of the plurality of second grille bars 3012 in the radial direction of the air outlet grille 30 is the same as the distance between one of the plurality of second grille bar 3012 adjacent to the fixing portion 302 and the fixing portion 302 in the radial direction of the air outlet grille 30.

[0082] In this way, the position of each second grille bar 3012 can be determined by determining at least one of the positional relationship between the first circumferential rib 30123 and the fixing portion 302, or the positional relationship between the second circumferential rib 30124 and the fixing portion 302.

[0083] In some embodiments of the present disclosure, as shown in FIG. 18, the first circumferential rib 30123 includes a first arc segment 30123Q. The first arc segment 30123Q is an arc of the first circumferential rib 30123 between two adjacent first grille bars 3011, for example, the adjacent first rib 30111 and the second rib 30112.

[0084] The arc length of the first arc segment 30123Q is defined as R 1 . The arc length R 1 satisfies: 0.15 ≤ 2R 1 / D 2 ≤ 0.2 . It should be noted that the ratio of the arc length R 1 to the radius of the fixing portion 302 may increase with the increase of the minimum radial dimension D 2 of the air outlet grille 30.

[0085] In the case where the minimum radial dimension D 2 of the air outlet grille 30 is determined, the range of the arc length R 1 of the first arc segment 30123Q is determined by the above conditions. In this case, since the included angle β between the extending directions of the two adjacent first grille bars 3011 is determined, the radius of the first arc segment 30123Q can be determined, that is, the radius of the first circumferential rib 30123 can be determined, so that the distance between the first circumferential rib 30123 and the fixing portion 302 can be determined, and the distance between any two adjacent second grille bars 3012 can be further determined.

[0086] In other embodiments of the present disclosure, as shown in FIG. 18, the second circumferential rib 30124 includes a second arc segment 30124Q. The second arc segment 30124Q is an arc of the second circumferential rib 30124 between two adjacent first ribs 30111.

[0087] The arc length of the second arc segment 30124Q is defined as R 2 . The arc length R 2 satisfies: 0.15 ≤ 2R 2 / D 2 ≤ 0.2. It should be noted that the ratio of the second arc length R 2 to the radius of the fixing portion 302 may increase with the increase of the minimum radial dimension D 2 of the air outlet grille 30.

[0088] Therefore, when the minimum radial dimension D 2 of the air outlet grille 30 is determined, the range of the second arc length R 2 of the second arc segment 30124Q is determined by the above conditions. In this case, since the included angle β between the extending directions of the two adjacent first grille bars 3011 is determined, that is, the included angle 2β between the two adjacent first ribs 30111 can also be determined. The radius of the second arc segment 30124Q can then be determined, that is, the radius of the second circumferential rib 30124 can be determined. When the length of the second ribs 30112 is determined, the radius of the third circumferential rib 30125 can be determined, so that the distance between the second circumferential rib 30124 and the third circumferential ribs 30125 can be determined, and the distance between any two adjacent second grille bars 3012 can be further determined.

[0089] By calculating at least one of the ratio of the arc length R 1 to the radius of the fixing portion 302 and the ratio of the arc length R 2 to the radius of the fixing portion 302, the distance between any two adjacent second grille bars 3012 can be determined, so that the distance between any two adjacent second grille bars 3012 is increased while the air outlet grille 30 satisfies the requirements of the mold processing and mounting specifications, thereby facilitating the air flow blown by the outdoor fan 20 to flow out of the air outlet grille 30, and reducing the blocking force of the air outlet grille 30 to the air flow blown by the outdoor fan 20.

[0090] As shown in FIG. 14, in some embodiments of the present disclosure, the at least one second grille bar 3012 further includes a fourth circumferential rib 30126. The fourth circumferential rib 30126 is disposed adjacent to the fixing portion 302. An end opening of the fourth circumferential rib 30126 adjacent to the outdoor fan 20 is smaller than an end opening of the fourth circumferential rib 30126 away from the outdoor fan 20, that is, a radial dimension of the fourth circumferential rib 30126 gradually decreases in a direction away from the outdoor fan 20. In this way, the air flow flowing to the position where the fourth circumferential rib 30126 is located can be easily guided, thereby resolving the problem that the air volume of the outdoor unit 1 is affected when the radial dimensions of the plurality of second grille bars 3012 are consistent due to the different air volumes of the air flow flowing to different positions on the air outlet grille 30 and the different air outlet directions of the air flow.

[0091] In this case, the ratio of the radius J of the at least one second grille bar 3012 to the first distance L 3 satisfies: 0.28 ≤ J / L 3 ≤ 0.44.

[0092] As shown in FIG. 19, when the radial dimension of the fourth circumferential rib 30126 is not adjusted, the collision between the air flow and the fourth circumferential rib 30126 will generate a relatively large vortex, thus causing a relatively large blocking force to the air flow.

[0093] As shown in FIG. 20, after the fourth circumferential rib 30126 is adjusted according to the above conditions, with the guidance of the fourth circumferential rib 30126 to the air flow, the vortex generated by the air flow at the fourth circumferential rib 30126 is reduced, the blocking force to the air flow at this location is reduced, and the flow rate is more stable.

[0094] In some embodiments of the present disclosure, as shown in FIG. 14, the at least one second grille bar 3012 further includes a fifth circumferential rib 30127. The fifth circumferential rib 30127 is located at a middle position between the fixing portion 302 and the supporting portion 303 in the radial direction of the air outlet grille 30, the air flow at this position is gentle. Therefore, the radial dimension of the fifth circumferential rib 30127 does not change in the direction away from the outdoor fan 20.

[0095] In this case, the ratio of the radius J of the at least one second grille bar 3012 to the first distance L 3 satisfies: 0.44 ≤ J / L 3 ≤ 0.78.

[0096] In some embodiments of the present disclosure, as shown in FIG. 14, the at least one second grille bar 3012 further includes a sixth circumferential rib 30128. The sixth circumferential rib 30128 is located adjacent to the supporting portion 303. An end opening of the sixth circumferential rib 30128 adjacent to the outdoor fan 20 is larger than an end opening of the sixth circumferential rib 30128 away from the outdoor fan 20, that is, a radial dimension of the sixth circumferential rib 30128 gradually increases in a direction away from the outdoor fan 20, so that the sixth circumferential rib 338 guides the air flow flowing to the position where the sixth circumferential rib 30128 is located.

[0097] In this case, the ratio of the radius J of the at least one second grille bar 3012 to the first distance L 3 satisfies: J / L 3 ≥ 0.78.

[0098] As shown in FIG. 21, when the radial dimension of the sixth circumferential rib 30128 is not adjusted, the air flow collides seriously with the air outlet grille 30 at the sixth circumferential rib 30128, and a relatively large vortex is generated at a position adjacent to the supporting portion 303, thus causing a relatively large blocking force to the air flow.

[0099] As shown in FIG. 22, after the sixth circumferential rib 30128 is adjusted according to the above conditions, with the guidance of the sixth circumferential rib 30128 to the air flow, the vortex generated by the air flow at the sixth circumferential rib 30128 is reduced, the blocking force to the air flow at this location is reduced, and the flow rate is more stable.

[0100] It should be noted that in the case of J / L 3 <0.28, the radius J of the at least one second grille bar 3012 is smaller than the radius of the supporting portion 303. In this case, only the supporting portion 303 can be provided, and the at least one second grille bar 3012 cannot be provided. In the case of J / L 3 = 0.28, the at least one second grille bar 3012 is fixed to a peripheral wall of the supporting portion 303.

[0101] In some embodiments of the present disclosure, the projection of the axis of the at least one second grille bar 302 on the inner wall surface thereof is a first straight line segment.

[0102] As shown in FIG. 14, when 0.28 ≤ J / L 3 ≤ 0.44, that is, the first straight line segment is the projection of the axis of the fourth circumferential rib on the inner wall surface thereof, the included angle C 1 between the extension line of the first straight line segment and the axis of the at least one second grille bar 302 equals to 75-160×(J / L 3 ).

[0103] In this way, the air flow flowing to the fourth circumferential rib 30124 of the air outlet grille 30 can be better guided, thereby reducing the blocking force of the air outlet grille 30 to the air flow blown by the outdoor fan 20.

[0104] In some embodiments of the present disclosure, when J / L 3 ≥ 0.78, that is, when the first straight line segment is the projection of the axis of the sixth circumferential rib 30128 on the inner wall surface of the sixth circumferential rib 30128, the included angle C 2 between the extension line of the first straight line segment and the axis of the at least one second grille bar 3012 equals to 50-64×(J / L 3 ).

[0105] In this way, the air flow flowing to the sixth circumferential rib 30128 of the air outlet grille 30 can be better guided, thereby reducing the blocking force of the air outlet grille 30 to the air flow blown by the outdoor fan 20.

[0106] As shown in FIGS. 23 and 24, the at least one first grille bar 3011 includes air guide surfaces 3013. The air guide surfaces 3013 refer to the side surfaces of two adjacent first grille bars 3011 facing each other. The air guide surface 3013 includes a first side edge 30131 and a second side edge 30132, and the second side edge 30132 is located on a side of the first side edge 30131 away from the outdoor fan 20.

[0107] In some embodiments of the present disclosure, when the rotation speed of the outdoor fan 20 is low, the air guide surface 3013 is perpendicular to an end surface of the fixing portion 302 facing the air outlet grille 30.

[0108] In other embodiments of the present disclosure, an included angle γ is formed between the air guide surface 3013 and the end surface of the fixing portion 302 facing the air outlet grille 30, that is, in the axial direction of the fixing portion 302 and along the rotation direction of the outdoor fan 20 (for example, the direction Y as shown in FIG. 24), the second side edge 30132 is located on a side of the first side edge 30131. The included angle γ satisfies: 80° ≤ γ < 90°. For example, the included angle γ may be 80°, 82°, 84°, 85°, 86°, or 89°. In this way, the air guide surface 3013 can facilitate the guidance of the air flow blown by the outdoor fan 20, thereby reducing the blocking force of the air outlet grille 30 to the air flow blown by the outdoor fan 20.

[0109] In some embodiments of the present disclosure, as shown in FIG. 23, the dimension of the fixing portion 302 in the axial direction thereof is defined as a fourth dimension H 4 . The fourth dimension H 4 satisfies: 5 mm ≤ H 4 ≤ 60 mm. For example, the fourth dimension H 4 may be 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, or 60 mm. In this way, the blocking force of the fixing portion 302 to the air flow can be reduced.

[0110] It should be noted that when H 4 <5 mm, the difficulty of production of the fixing portion 302 is increased, and the strength of the fixing portion 302 is reduced, so that the fixing portion 302 is easily damaged during use.

[0111] When H 4 >60 mm, since the air outlet grille 30 is fixed to the end of the fixing portion 302 away from the outdoor fan 20, the distance between the air outlet grille 30 and the outdoor fan 20 is excessively large, which causes the air flow blown onto the air outlet grille 30 to be excessively dispersed, thereby increasing the blocking force to the air flow and the loss of the air volume.

[0112] In some embodiments of the present disclosure, as shown in FIG. 25, the fixing portion 302 is provided with at least one through hole 3021, and the at least one through hole 3021 is formed on a side of the fixing portion 302 away from the outdoor fan 20. In this way, the air flow flowing to the fixing portion 302 can flow out through the at least one through hole 3021, so as to further reduce the blocking force of the fixing portion 302 to the air flow blown by the outdoor fan 20.

[0113] A dimension of the through hole 3021 along the axial direction of the fixing portion 302 is defined as L 4 , and L 4 satisfies: 0.023 ≤ 2L 4 / D 2 ≤ 0.027.

[0114] The maximum dimension of the through hole 3021 along a circumferential direction of the fixing portion 302 is defined as L5, and L5 satisfies: 0.09 ≤ 2L5 / D 2 ≤ 0.1 . In this way, the area of the through hole 3021 can be relatively large, which is more conducive to the air flow flowing out from the through hole 3021.

[0115] As shown in FIG. 26, when no through hole 3021 is formed on the side wall of the fixing portion 302 away from the outdoor fan 20, the air flow flowing to the fixing portion 302 would be blocked by the fixing portion 302, so that the air flow would collides with the fixing portion 302 and the at least one grille bar 301 adjacent to the fixing portion 302, thereby affecting the flow rate of the air flow at this position and causing blocking force to the air flow at this position.

[0116] As shown in FIG. 27, when the through hole 3021 is formed on the fixing portion 302, the impact of the air flow flowing to the fixing portion 302 on the fixing portion 302 and the at least one grille bar 301 adjacent to the fixing portion 302 would be reduced, the flow rate of the air flow at this position would be improved, and the blocking force of the fixing portion 302 to the air flow would be reduced. Table. 1 Comparisons Between Dimension Parameters and Performance Parameters of Outdoor UnitDimension ParametersPerformance ParametersD 1 (mm)D 2 (mm)D 3 (mm)L 1 (mm)Air Volume (m 3< / h)Rotation Speed (rpm)Noise (dB)Scheme 161663060030462668156.8Scheme 261667060030462663454.7

[0117] Table. 1 shows comparisons between dimension parameters and performance parameters of the outdoor unit according to some embodiments. As shown in Table 1, a dimensional relationship between the air guide portion 40 and the air outlet grille 30 is simulated. In some embodiments of the present disclosure, Scheme 1 and Scheme 2 are provided. The minimum radial dimension D 1 of the air guide portion 40 in Scheme 1 is equal to the minimum radial dimension D 1 of the air guide portion 40 in Scheme 2. The minimum radial dimension D 2 of the air outlet grille 30 in Scheme 1 is less than the minimum radial dimension D 2 of the air outlet grille 30 in Scheme 2 by 40 mm. In this case, the value of (D 2 -D 1 ) / D 1 in Scheme 2 is about 0.088, the value of (D 2 -D 1 ) / D 1 in Scheme 1 is about 0.023, and the value of (D 2 -D 1 ) / D 1 in Scheme 2 is greater than the value of (D 2 -D 1 ) / D 1 in Scheme 1 by 0.065.

[0118] The outlet air volume of the outdoor unit 1 reaches the same value, for example, reaches 4626 m 3< / h. In this case, the rotation speed of the fan 20 in Scheme 1 is 681 rpm, and the rotation speed of the fan 20 in Scheme 2 is 634 rpm. That is, in order to achieve the same outlet air volume, the rotation speed of the fan 20 required in Scheme 2 is 47 rpm lower than the rotation speed of the fan 20 required in Scheme 1. The noise generated by the outdoor unit 1 in Scheme 1 is 56.8 dB, the noise generated by the outdoor unit 1 in Scheme 2 is 54.7 dB, and the noise generated by the outdoor unit 1 in Scheme 2 is 2.1 dB lower than the noise generated by the outdoor unit 1 in Scheme 1.

[0119] It can be seen from Table. 1 that, when the dispersion range of the air flow after blowing out the air guide portion 40 remains unchanged, the increase of the minimum radial dimension D 2 of the air outlet grille 30 relative to the minimum radial dimension D 1 of the air guide portion 40 can reduce the loss of the outlet air volume caused by the air outlet grille 30. Moreover, when the outdoor unit 1 reaches the same air volume and achieves the same heat exchange efficiency, the required rotation speed of the fan 20 is lower, and the generated noise is lower, thereby improving the experience of the user on the outdoor unit 1.

[0120] The diameter of the largest circle formed by the rotation of the fan blade 201 is D 3 , and the value of D 3 is 600 mm. The dimension of the fixing portion 302 of the air outlet grille 30 in the axial direction of the mounting opening 101 is L 1 , and L 1 is 30 mm. The minimum radial dimension D 1 of the air guide portion 40, the diameter D 3 of the largest circle formed by the rotation of the fan blade 201, and the dimension L 1 of the fixing portion 302 of the air outlet grille 30 in the axial direction of the mounting opening 101 in Scheme 2 are consistent with those in Scheme 1.

[0121] It should be understood that the air flow generated by the fan 20 is guided by the air guide portion 40 and blown onto the air outlet grille 30. The blocking force of the air outlet grille 30 to the air flow is reduced, and the loss of the air volume is reduced, which increases the air volume of the outdoor unit 1, thereby improving the heat exchange efficiency of the outdoor unit 1.

[0122] As shown in FIG. 28, in some embodiments of the present disclosure, the housing 10 includes a panel 11. The panel 11 includes a first panel body 111, a second panel body 112, and a third panel body 113. The first panel body 111, the second panel body 112, and the third panel body 113 are sequentially connected along the radial direction of the mounting opening 101.

[0123] The first panel body 111 is disposed around the second panel body 112. The second panel body 112 is disposed around the third panel body 113. The third panel body 113 is disposed on a side of the first panel body 111 facing the receiving cavity 102. The mounting opening 101 is formed on the third panel body 113. In this way, when the air outlet grille 30 is mounted at the mounting opening 101, the dimension of the outdoor unit 1 in the axial direction of the mounting opening 101 is smaller than the sum of the dimension of the fixing portion 302 of the air outlet grille 30 and the dimension of the housing 10 in the axial direction of the mounting opening 101, so that the requirement of small size design for the outdoor unit 1 can be satisfied.

[0124] Those skilled in the art will understand that the disclosure scope of the present disclosure is not limited to the above specific embodiments, and 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: an indoor unit comprising an indoor heat exchanger; and an outdoor unit comprising: a compressor; an outdoor heat exchanger; a housing provided with a mounting opening and a receiving cavity, wherein the mounting opening communicates outside with the receiving cavity; an outdoor fan disposed in the receiving cavity and opposite to the mounting opening; an air outlet grille disposed at the mounting opening and connected to the housing; and an air guide portion disposed in the receiving cavity and located at the mounting opening, the air guide portion being connected to the housing and extending along a circumferential direction of the mounting opening; wherein a minimum radial dimension of the air guide portion is defined as D1, a minimum radial dimension of the air outlet grille is defined as D2, and the D1 and the D2 satisfy: 0 ≤ (D2-D1) / D1 ≤ 0.25, so as to reduce an obstruction of the air guide portion to an air flow.

2. The air conditioner according to claim 1, wherein the D1 and the D2 further satisfy: 0.05 ≤ (D2-D1) / D1 ≤ 0.15.

3. The air conditioner according to claim 1 or 2, wherein the outdoor fan comprises: a motor connected to the housing; and a fan blade connected to the motor, the fan blade being disposed opposite to the mounting opening; wherein the motor is configured to drive the fan blade to rotate, a diameter of a maximum circle formed by rotating the fan blade is defined as D3, the D1 and the D3 satisfy: 0.02 ≤ (D1-D3) / D3 ≤ 0.1, and D1-D3 ≥ 12 mm.

4. The air conditioner according to any one of claims 1 to 3, wherein the air outlet grille comprises: a fixing portion extending circumferentially along an edge of the air outlet grille and connected to the housing; and at least one grille bar disposed in the fixing portion and connected to the fixing portion; wherein a dimension of the fixing portion in an axial direction of the mounting opening is defined as L1, and the L1 satisfies: 5 mm ≤ L1 ≤ 60 mm.

5. The air conditioner according to any one of claims 1 to 4, wherein the air guide portion comprises: a first sub-air guide portion connected to the housing; and a second sub-air guide portion connected to the first sub-air guide portion, and located on a side of the first sub-air guide portion away from the housing; wherein a radial dimension of the first sub-air guide portion decreases in a direction from the first sub-air guide portion to the second sub-air guide portion.

6. The air conditioner according to claim 5, wherein a dimension of the first sub-air guide portion in the axial direction of the mounting opening is defined as L2, and the L2 satisfies: 0 < L2 ≤ 20 mm.

7. The air conditioner according to claim 5 or 6, wherein the first sub-air guide portion comprises an inner circumferential surface, an included angle between a normal line of the inner circumferential surface and an axis of the mounting opening is defined as α, and the α satisfies: 75° ≤ α < 90°.

8. The air conditioner according to claim 5 or 6, wherein a minimum radial dimension of the second sub-air guide portion is the minimum radial dimension D1 of the air guide portion.

9. The air conditioner according to any one of claims 1 to 6, wherein the housing comprises a panel; the panel comprises a first panel body, a second panel body and a third panel body that are sequentially connected along a radial direction of the mounting opening; the first panel body is disposed around the second panel body, the second panel body is disposed around the third panel body, and the third panel body is disposed on a side of the first panel body facing the receiving cavity; and the mounting opening is disposed on the third panel body.

10. The air conditioner according to any one of claims 1 to 9, wherein the air outlet grille comprises: a supporting portion coaxially disposed with the air outlet grille and configured to support at least one grille bar; and a fixing portion extending along an axial of the air outlet grille and connected to the housing; wherein the at least one grille bar comprises: at least one first grille bar, an end of the at least one first grille bar being connected to the supporting portion, another end of the at least one first grille bar facing the fixing portion and extending along a radial direction of the air outlet grille; and at least one second grille bar spaced apart around an axial center of the air outlet grille and cross-connected to the at least one first grille bar; wherein a dimension of the at least one second grille bar in an axial direction of the fixing portion is defined as a first dimension H1, a dimension of the at least one first grille bar in the axial direction of the fixing portion is defined as a second dimension H2, the first dimension H1 and the minimum radial dimension D2 of the air outlet grille satisfy: H1 ≥ 6 mm, and 0.011 ≤ H1 / D2 ≤ 0.014, and the second dimension H2 and the minimum radial dimension D2 of the air outlet grille satisfy: 0.011 ≤ H2 / D2 ≤ 0.014.

11. The air conditioner according to claim 10, wherein the at least one first grille bar comprises a plurality of first grille bars, an included angle between extending directions of two adjacent first grille bars in the plurality of first grille bars is defined as β, and the β satisfies: 7° ≤ β < 11°.

12. The air conditioner according to claim 10 or 11, wherein the second grille bar extends one circumference along a circumferential direction of the annular frame, the at least one first grille bar comprises at least one first rib and at least one second rib, the at least one first rib and the at least one second rib are arranged at intervals alternatively in a circumferential direction of the fixing portion, the at least one first rib and the at least one second rib extend in a radial direction of the fixing portion, and a length of the at least one first rib is greater than a length of the at least one second rib.

13. The air conditioner according to claim 12, wherein a distance from an axial center of the fixing portion to an end of the second rib away from the fixing portion is defined as a first distance L3, and the L3 and the D2 satisfy: 0.55 ≤ 2L3 / D2 ≤ 0.7.

14. The air conditioner according to claim 13, wherein the at least one second grille bar comprises a plurality of second grille bars, a distance between any two adjacent second grille bars of the plurality of second grille bars in the radial direction of the air outlet grille is the same as a distance between one of the plurality of second grille bars adjacent to the fixing portion and the fixing portion in the radial direction of the air outlet grille; at least one of the plurality of second grille bars comprises: a first circumferential rib connected to the first grille bar and comprising a first arc segment, the first arc segment being an arc of the first circumferential rib between two adjacent first grille bars; and a second circumferential rib being one of the plurality of second grille bars between the end of the second rib away from the fixing portion and the axial center of the air outlet grille and being adjacent to the fixing portion, and the second circumferential rib comprising a second arc segment, the second arc segment being an arc of the second circumferential rib between two adjacent first ribs; wherein an arc length of the first arc segment is defined as R1, and the R1 satisfies: 0.15 ≤ 2R1 / D2 ≤ 0.2; and an arc length of the second arc segment is defined as R2, and the R2 satisfies: 0.15 ≤ 2R2 / D2 ≤ 0.2.

15. The air conditioner according to claim 13 or 14, wherein a radius of the at least one second grille bar is defined as J; when the radius J of the second grille bar and the first distance L3 satisfy: 0.28 ≤ J / L3 ≤ 0.44, a radial dimension of the at least one second grille bar decreases in a direction away from the outdoor fan; when the radius J of the second grille bar and the first distance L3 satisfy: 0.44 ≤ J / L3 ≤ 0.78, the radial dimension of the at least one second grille bar remains unchanged in the direction away from the outdoor fan; and when the radius J of the second grille bar and the first distance L3 satisfy: J / L3 ≥ 0.78, the radial dimension of the at least one second grille bar increases in the direction away from the outdoor fan.

16. The air conditioner according to claim 15, wherein a projection of an axis of the at least one second grille bar on an inner wall surface thereof is defined as a first straight line segment; when the radius J of the second grille bar and the first distance L3 satisfy: 0.28 ≤ J / L3 ≤ 0.44, an included angle C1 between an extension line of the first straight line segment and the axis of the at least one second grille bar equals to 75-160×(J / L3); and when the radius J of the second grille bar and the first distance L3 satisfy: J / L3 ≥ 0.78, an included angle C2 between an extension line of the first straight line segment and the axis of the at least one second grille bar equals to 50-64×(J / L3).

17. The air conditioner according to any one of claims 12 to 14, wherein the at least one first grille bar comprises air guide surfaces, the air guide surfaces are side surfaces of two adjacent first grille bars facing each other, and the air guide surfaces meet one of the following conditions: the air guide surfaces are perpendicular to an end surface of the fixing portion facing the air outlet grille; or an included angle γ is formed between the air guide surface and the end surface of the fixing portion facing the air outlet grille.

18. The air conditioner according to any one of claims 11 to 14, wherein the fixing portion is provided with at least one through hole, and the at least one through hole is formed on a side of the fixing portion away from the outdoor fan.

19. The air conditioner according to claim 18, wherein a dimension of the through hole along the axial direction of the fixing portion is defined as L4, the dimension L4 satisfies: 0.023 ≤ 2L4 / D2 ≤ 0.027, a maximum dimension of the through hole along a circumferential direction of the fixing portion is defined as L5, and the dimension L5 satisfies: 0.09 ≤ 2L5 / D2 ≤ 0.1.

20. The air conditioner according to any one of claims 11 to 14, wherein the first dimension H1 and the second dimension H2 satisfy: H2 < H1, an end of the first grille bar away from the outdoor fan is connected to a side, which is adjacent to the outdoor fan, of an end of the second grille bar away from the outdoor fan; and an end of the first grille bar adjacent to the outdoor fan is connected to a side, which is away from the outdoor fan, of an end of the second grille bar adjacent to the outdoor fan.

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