Air conditioner

Abstract

An outdoor unit, comprising a first housing, a first air inlet, a first air outlet, an outdoor heat exchanger, a first fan and a fan assembly. A controller is configured to: control the start of the first fan such that the first fan reaches a first preset rotational speed, and control the start of a second fan such that the second fan reaches a second preset rotational speed, the second preset rotational speed being greater than the first preset rotational speed; and if it is determined that an electric current of the first fan is less than or equal to a rated electric current of the first fan, and an electric current of the second fan is less than or equal to a rated electric current of the second fan, when an actual air output volume of the outdoor unit is less than a rated air output volume, control the rotational speed of the first fan and the rotational speed of the second fan to increase by the same number of revolutions; when the actual air output volume is greater than the rated air output volume, control the rotational speed of the first fan and the rotational speed of the second fan to decrease by the same number of revolutions.

Description

air conditioner

[0001] This application claims the priority of Chinese patent application No. 202410365687.2 filed on March 28, 2024, the priority of Chinese patent application No. 202420619867.4 filed on March 28, 2024, the priority of Chinese patent application No. 202420620087.1 filed on March 28, 2024, The priority of the Chinese patent application with application number 202410365473.5 filed on March 28, 2024; the priority of the Chinese patent application with application number 202410365706.1 filed on March 28, 2024; the priority of the Chinese patent application with application number 202420619654.1 filed on March 28, 2024, all 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] Air conditioners are widely used for temperature regulation. They consist of an indoor unit and an outdoor unit. The indoor unit is located indoors and exchanges heat with the indoor air. The outdoor unit is located outdoors and exchanges heat from the refrigerant with the outdoor air.

[0004] Summary of the Invention

[0005] In one aspect, an air conditioner is provided. The air conditioner includes an indoor unit, an outdoor unit, and a controller. The outdoor unit is connected to the indoor unit and includes a first housing, a first air inlet, a first air outlet, an outdoor heat exchanger, a first fan, and a fan assembly. The first housing includes a first cavity, the first air inlet being disposed in the first housing. The first air outlet is disposed in the first housing. The first air inlet and the first air outlet are each in communication with the first cavity. The outdoor heat exchanger is disposed in the first cavity. The first fan is disposed in the first cavity. The first fan is configured to drive outdoor air through the first air inlet, then through the outdoor heat exchanger, and out through the first air outlet. The fan assembly is disposed on top of the first housing and is detachably connected thereto. The fan assembly includes a second housing, a second air inlet, a second air outlet, and a second fan. The second housing is disposed on top of the first housing and includes a second cavity. The second air inlet is disposed in the second housing and is opposite the first air outlet. The second air outlet is provided in the second housing, and the second air inlet and the second air outlet are respectively connected to the second chamber. The second fan is provided inside the second housing, and the second fan can drive the air in the first chamber into the second chamber through the second air inlet, and then be discharged to the outside through the second air outlet. The controller is configured to: control the first fan to be turned on so that the first fan reaches a first preset speed, and control the second fan to be turned on so that the second fan reaches a second preset speed. The second preset speed is greater than the first preset speed. If it is determined that the current of the first fan is less than or equal to the rated current of the first fan, and the current of the second fan is less than or equal to the rated current of the second fan. When the actual air volume of the outdoor unit is less than the rated air volume, the speeds of the first and second fans are controlled to increase by the same number of revolutions. When the actual air volume is greater than the rated air volume, the speeds of the first and second fans are controlled to decrease by the same number of revolutions.

[0006] In another aspect, an outdoor unit is provided. An air conditioner is provided. The air conditioner includes an indoor unit, an outdoor unit, and a controller. The outdoor unit is connected to the indoor unit and includes a first housing, a first air inlet, a first air outlet, an outdoor heat exchanger, a first fan, and a fan assembly. The first housing includes a first cavity, the first air inlet being disposed in the first housing. The first air outlet is disposed in the first housing. The first air inlet and the first air outlet are each connected to the first cavity. The outdoor heat exchanger is disposed in the first cavity. The first fan is disposed in the first cavity. The first fan is configured to drive outdoor air through the first air inlet, then through the outdoor heat exchanger, and out through the first air outlet. The fan assembly is disposed on top of the first housing and is detachably connected thereto. The fan assembly includes a second housing, a second air inlet, a second air outlet, and a second fan. The second housing is disposed on top of the first housing and includes a second cavity. The second air inlet is disposed in the second housing and is opposite the first air outlet. The second air outlet is provided in the second shell, and the second air inlet and the second air outlet are respectively connected to the second cavity. The second fan is provided inside the second shell, and the second fan can drive the air in the first cavity into the second cavity through the second air inlet, and then be discharged to the outside through the second air outlet. The controller is configured to: control the first fan to be turned on so that the first fan reaches a first preset speed, and control the second fan to be turned on so that the second fan reaches a second preset speed. The second preset speed is greater than the first preset speed. If it is determined that the actual air output of the outdoor unit is equal to the rated air output. When the current of the first fan is greater than the rated current of the first fan and the current of the second fan is less than or equal to the rated current of the second fan, the speed of the second fan is controlled to be increased, and the speed of the first fan is controlled to be reduced.

[0007] In another aspect, an outdoor unit is provided. An air conditioner is provided. The air conditioner includes an indoor unit, an outdoor unit, and a controller. The outdoor unit is connected to the indoor unit and includes a first housing, a first air inlet, a first air outlet, an outdoor heat exchanger, a first fan, and a fan assembly. The first housing includes a first cavity, the first air inlet being disposed in the first housing. The first air outlet is disposed in the first housing. The first air inlet and the first air outlet are each connected to the first cavity. The outdoor heat exchanger is disposed in the first cavity. The first fan is disposed in the first cavity. The first fan is configured to drive outdoor air through the first air inlet, then through the outdoor heat exchanger, and out through the first air outlet. The fan assembly is disposed on top of the first housing and is detachably connected thereto. The fan assembly includes a second housing, a second air inlet, a second air outlet, and a second fan. The second housing is disposed on top of the first housing and includes a second cavity. The second air inlet is disposed in the second housing and is opposite the first air outlet. The second air outlet is provided in the second shell, and the second air inlet and the second air outlet are respectively connected to the second cavity. The second fan is provided inside the second shell, and the second fan can drive the air in the first cavity into the second cavity through the second air inlet, and then be discharged to the outside through the second air outlet. The controller is configured to: control the first fan to be turned on so that the first fan reaches a first preset speed, and control the second fan to be turned on so that the second fan reaches a second preset speed. The second preset speed is greater than the first preset speed. If it is determined that the actual air output of the outdoor unit is greater than the rated air output. When the current of the first fan is less than or equal to the rated current of the first fan and the current of the second fan is greater than the rated current of the second fan, control the speed of the second fan to be reduced.

[0008] In another aspect, an outdoor unit is provided. An air conditioner is provided. The air conditioner includes an indoor unit, an outdoor unit, and a controller. The outdoor unit is connected to the indoor unit and includes a first housing, a first air inlet, a first air outlet, an outdoor heat exchanger, a first fan, and a fan assembly. The first housing includes a first cavity, the first air inlet being disposed in the first housing. The first air outlet is disposed in the first housing. The first air inlet and the first air outlet are each connected to the first cavity. The outdoor heat exchanger is disposed in the first cavity. The first fan is disposed in the first cavity. The first fan is configured to drive outdoor air through the first air inlet, then through the outdoor heat exchanger, and out through the first air outlet. The fan assembly is disposed on top of the first housing and is detachably connected thereto. The fan assembly includes a second housing, a second air inlet, a second air outlet, and a second fan. The second housing is disposed on top of the first housing and includes a second cavity. The second air inlet is disposed in the second housing and is opposite the first air outlet. The second air outlet is disposed in the second housing, and the second air inlet and the second air outlet are respectively connected to the second chamber. The second fan is disposed within the second housing and can drive air in the first chamber into the second chamber through the second air inlet, and then be discharged outdoors through the second air outlet. The controller is configured to: control the first fan to be turned on so that the first fan reaches a first preset speed, and control the second fan to be turned on so that the second fan reaches a second preset speed. The second preset speed is greater than the first preset speed. If it is determined that the power of the first fan is less than or equal to the rated power of the first fan, and the power of the second fan is less than or equal to the rated power of the second fan. When the actual air volume of the outdoor unit is less than the rated air volume, the speeds of the first and second fans are controlled to increase by the same number of revolutions. When the actual air volume is greater than the rated air volume, the speeds of the first and second fans are controlled to decrease by the same number of revolutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1A is a structural diagram of an air conditioner according to some embodiments;

[0010] FIG1B is a block diagram of an air conditioner according to some embodiments;

[0011] FIG1C is a structural diagram of an outdoor unit according to some embodiments;

[0012] FIG2 is another structural diagram of an outdoor unit according to some embodiments;

[0013] FIG3 is another structural diagram of an outdoor unit according to some embodiments;

[0014] FIG4 is another structural diagram of an outdoor unit according to some embodiments;

[0015] 5 is a structural diagram of a first housing, a second housing, and a fastening assembly of an outdoor unit according to some embodiments;

[0016] FIG6 is a structural diagram of a first connecting member of an outdoor unit according to some embodiments;

[0017] FIG7 is a structural diagram of a fastener of an outdoor unit according to some embodiments;

[0018] FIG8 is a structural diagram of a connection plate and a fastening assembly of an outdoor unit according to some embodiments;

[0019] FIG. 9 is another structural diagram of a connection plate and a fastening assembly of an outdoor unit according to some embodiments.

[0020] FIG10 is another structural diagram of an outdoor unit according to some embodiments;

[0021] FIG11 is a structural diagram of a first fan and a second fan of an outdoor unit according to some embodiments;

[0022] FIG12 is another structural diagram of a first fan and a second fan of an outdoor unit according to some embodiments;

[0023] FIG13 is a diagram illustrating the internal structure of an outdoor unit according to some embodiments;

[0024] FIG14 is a structural diagram of a fan assembly of an outdoor unit according to some embodiments;

[0025] FIG15 is another structural diagram of a fan assembly of an outdoor unit according to some embodiments;

[0026] FIG16 is another structural diagram of a fan assembly of an outdoor unit according to some embodiments;

[0027] FIG17 is another structural diagram of a fan assembly of an outdoor unit according to some embodiments;

[0028] FIG18 is a structural diagram of an electrical box of an outdoor unit according to some embodiments;

[0029] FIG19 is a cross-sectional view along line AA in FIG18;

[0030] FIG20 is a structural diagram of a first fan and a second fan of an outdoor unit according to some embodiments;

[0031] FIG21 is a diagram illustrating positions of a first fan and a second fan of an outdoor unit according to some embodiments;

[0032] FIG22 is a diagram illustrating another position of a first fan and a second fan of an outdoor unit according to some embodiments;

[0033] FIG23 is a flow chart of steps performed by a controller according to some embodiments;

[0034] FIG24 is another flow chart of steps performed by a controller according to some embodiments;

[0035] FIG25 is another flow chart of steps performed by a controller according to some embodiments;

[0036] FIG26 is another flow chart of steps performed by a controller according to some embodiments;

[0037] FIG27 is another flow chart of steps performed by a controller according to some embodiments;

[0038] FIG28 is another flow chart of steps performed by a controller according to some embodiments;

[0039] FIG. 29 is another flow chart of steps performed by a controller according to some embodiments. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] When describing some embodiments, the word "connected" and its derivatives may be used. The term "connected" should be understood broadly. For example, "connected" can mean fixed, removable, or integrated; it can be directly connected or indirectly connected through an intermediary. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0044] “At least one of A, B and C” has the same meaning as “at least one of A, B or C” and both include the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.

[0045] 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.

[0046] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of deviation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0047] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within an acceptable deviation range, wherein the acceptable deviation range is as determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, that the difference between the two equals is less than or equal to 5% of either one.

[0048] Typically, an air conditioner consists of an indoor unit and an outdoor unit. Due to the complex and varied installation scenarios of outdoor units, for example, when the outdoor unit is installed in a confined space, requires an external air duct, or is exposed to harsh, high-static-pressure environments such as typhoons and heavy rain, the fan assembly inside the outdoor unit struggles to maintain normal airflow. Consequently, the air conditioner's heat exchange capacity cannot meet preset requirements, and the outdoor unit's airflow is severely attenuated, affecting the air conditioner's ability to withstand static pressure.

[0049] Here, the static pressure resistance of an air conditioner refers to the external system resistance or pressure that the air conditioner can withstand when it is running.

[0050] In order to solve the above problems, some embodiments of the present disclosure provide an air conditioner 1000 .

[0051] As shown in Figure 1A, the air conditioner 1000 includes an indoor unit 10 and an outdoor unit 20. The indoor unit 10 and the outdoor unit 20 are connected by a pipeline to transmit refrigerant. It should be noted that Figure 1A illustrates the air conditioner 1000 as a wall-mounted air conditioner, with the indoor unit 10 hung on an indoor wall. Of course, the air conditioner 1000 in some embodiments of the present disclosure may also be a cabinet air conditioner. In addition, since the indoor unit 10 in Figure 1A is located indoors and the outdoor unit 20 is located outdoors, the outdoor unit 20 is represented by a dotted line in Figure 1A.

[0052] As shown in FIG1B , the indoor unit 10 includes an indoor heat exchanger 1001. The indoor heat exchanger 1001 is configured to exchange heat between indoor air and the refrigerant flowing through the indoor heat exchanger 1001. For example, when the air conditioner 1000 is in cooling mode, the indoor heat exchanger 1001 operates as an evaporator, causing the refrigerant flowing through the outdoor unit 20 to absorb heat from the indoor air through the indoor heat exchanger 1001 and evaporate. When the air conditioner 1000 is in heating mode, the indoor heat exchanger 1001 operates as a condenser, causing the refrigerant flowing through the outdoor unit 20 to dissipate heat to the indoor air through the indoor heat exchanger 1001 and condense. The indoor heat exchanger 1001 is provided with a coil connected to the refrigerant circuit. The refrigerant flows through the coil of the indoor heat exchanger 1001 to exchange heat with the indoor air.

[0053] As shown in FIG1C , the outdoor unit 20 includes a first housing 1. The first housing 1 has a top and a bottom. The height of the first housing 1 is defined as the distance from the bottom to the top. The width of the first housing 1 is defined as the distance from one side of the first housing 1 to the other side. The first housing 1 has a front side and a rear side that are opposite to each other. The front side, rear side, left side, and right side of the first housing 1 are defined as the circumferential sides of the first housing 1.

[0054] In some embodiments, as shown in Figures 1C to 4, the outdoor unit 20 further includes a first cavity 11, a first air inlet 12, and a first air outlet 13. The first cavity 11 is disposed within the first housing 1. The first air inlet 12 is disposed on the first housing 1 and communicates with the outdoor space.

[0055] As shown in FIG. 2 and FIG. 4 , the first air outlet 13 is provided on the first housing 1 , and the first air inlet 12 and the first air outlet 13 are communicated with the first cavity 11 .

[0056] As shown in FIG3 , the outdoor unit 20 further includes an outdoor heat exchanger 2 . The outdoor heat exchanger 2 is disposed in the first chamber 11 , and a refrigerant flows through the outdoor heat exchanger 2 . The refrigerant is configured to exchange heat with air entering the first chamber 11 and flowing through the outdoor heat exchanger 2 .

[0057] In some embodiments, the outdoor heat exchanger 2 is arc-shaped and can be disposed along the circumferential direction of the first housing 1, surrounding the inner wall of the first housing 1. The first air inlet 12 can be disposed along the circumferential direction of the first housing 1, and the outdoor heat exchanger 2 is disposed at a position corresponding to the first air inlet 12, so that when outdoor air flows into the first chamber 11 through the first air inlet 12, the outdoor air flows through the outdoor heat exchanger 2 and exchanges heat with the refrigerant in the outdoor heat exchanger 2, thereby improving the heat exchange effect of the outdoor heat exchanger 2.

[0058] For example, in the cooling mode of air conditioner 1000, outdoor heat exchanger 2 operates as a condenser, allowing the refrigerant compressed by compressor 201 to condense by dissipating heat to the outdoor air through outdoor heat exchanger 2. In the heating mode of air conditioner 1000, outdoor heat exchanger 2 operates as an evaporator, allowing the decompressed refrigerant to absorb heat from the outdoor air through outdoor heat exchanger 2 and evaporate. Outdoor heat exchanger 2 is equipped with a coil connected to the refrigerant circuit, and the refrigerant flows through the coil of outdoor heat exchanger 2 to exchange heat with the outdoor air. Outdoor fan 203 is configured to draw outdoor air into outdoor unit 20 through the outdoor air inlet of outdoor unit 20 and to discharge the outdoor air, after exchanging heat with outdoor heat exchanger 2, through the outdoor air outlet of outdoor unit 20.

[0059] As shown in Figures 2 and 4, the outdoor unit 20 further includes at least one first fan 3. The at least one first fan 3 is disposed in the first chamber 11 and is configured to drive outdoor air through the first air inlet 12 and then flow through the indoor heat exchanger in the first chamber 11. The air after flowing through the indoor heat exchanger flows out through the first air outlet 13.

[0060] In some embodiments, as shown in FIG1B , the outdoor unit 20 further includes a compressor 201. The compressor 201 is disposed within the first chamber 11 and is mounted at the bottom of the outdoor unit 20. The compressor 201 is disposed on the leeward side of the arc-shaped outdoor heat exchanger 2. Outdoor air flows through the outdoor heat exchanger 2 to exchange heat with the refrigerant within the outdoor heat exchanger 2. The heat-exchanged air then flows through the compressor, removing heat generated by the operation of the compressor 201, thereby preventing the compressor from overheating and increasing the operational stability of the compressor 201. The compressor 201 is configured to compress the refrigerant, thereby compressing the low-pressure refrigerant into a high-pressure refrigerant.

[0061] In some embodiments, as shown in FIG1B , the outdoor unit 20 further includes a throttling device 204. The throttling device 204 is disposed in the first chamber 11 and is configured to expand the high-temperature and high-pressure liquid refrigerant into a low-pressure liquid refrigerant. The throttling device 204 is disposed on the leeward side of the outdoor heat exchanger 2 so that the throttling device 204 is connected to the compressor.

[0062] In some embodiments, a throttle device 204 is connected between the outdoor heat exchanger 2 and the indoor heat exchanger 1001. The opening of the throttle device 204 regulates the pressure of the refrigerant flowing through the outdoor heat exchanger 2 and the indoor heat exchanger 1001, thereby adjusting the refrigerant flow rate between the outdoor heat exchanger 2 and the indoor heat exchanger 1001. The flow rate and pressure of the refrigerant flowing between the outdoor heat exchanger 2 and the indoor heat exchanger 1001 will affect the heat exchange performance of the outdoor heat exchanger 2 and the indoor heat exchanger 1001. The opening of the throttle device 204 is adjustable to control the flow rate and pressure of the refrigerant flowing through the throttle device 204. For example, the throttle device 204 expands the liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. It should be noted that some embodiments of the present disclosure use the throttle device 204 as an example for installation in the outdoor unit 20. Of course, in some embodiments, the throttle device 204 can also be installed in the indoor unit 10.

[0063] As shown in Figures 1C to 4, the outdoor unit 20 also includes a fan assembly 4 and at least one fastening assembly 5. The fan assembly 4 is disposed on top of the first housing 1 and is configured to increase the airflow of the outdoor unit 20, thereby enhancing the outdoor unit 20's ability to withstand static pressure. The fan assembly 4 is removably connected to the first housing 1 via the fastening assembly 5. This facilitates installation of the fan assembly 4 in high-static-pressure environments to enhance the outdoor unit 20's ability to withstand static pressure, and also facilitates disassembly and maintenance of the fan assembly 4.

[0064] In some embodiments, as shown in FIG4 , the fan assembly 4 includes a second housing 41 and a second cavity 413 . The second housing 41 is disposed on top of the first housing 1 , and the second cavity 413 is formed inside the second housing 41 .

[0065] As shown in FIG4 , the fan assembly 4 further includes a second air inlet 411 , which is disposed on the second housing 41 . The second air inlet 411 is disposed opposite to the first air outlet 13 , and is in communication with the second cavity 413 .

[0066] As shown in FIG4 , the fan assembly 4 further includes a second air outlet 412 . The second air outlet 412 is provided on the second housing 41 . The second air outlet 412 is connected to the outdoor space, and the second air outlet 412 and the second air inlet 411 are respectively connected to the second cavity 413 .

[0067] In some embodiments, as shown in FIG2 , the fan assembly 4 further includes at least one second fan 42. The second fan 42 is disposed in the second chamber 413 and is configured to drive the air in the first chamber 11 into the second chamber 413 through the second air inlet 411 and then be discharged to the outside through the second air outlet 412.

[0068] In some embodiments, the second air inlet 411 and the second air outlet 412 are respectively disposed at opposite ends of the second housing 41 in the height direction, i.e., the second air inlet 411 is disposed at the bottom of the second housing 41, and the second air outlet 412 is disposed at the top of the second housing 41. The first air outlet 13, the second air inlet 411, and the second air outlet 412 are connected in the height direction of the second housing 41 to reduce wind energy loss when the air flow direction inside the first housing 1 and the second housing 41 changes.

[0069] In some embodiments, as shown in Figures 5 to 9 , the fastening assembly 5 includes a fastener 51. The fastener 51 is configured to connect the first housing 1 and the second housing 41. For example, as shown in Figure 5 , the first housing 1 is provided with a second opening 14, and the second housing 41 is provided with a first opening 4141. The top of the fastener 51 is provided with the first opening 4141, and the bottom of the fastener 51 is provided with the second opening 14. In this way, the fastener 51 can connect the first housing 1 and the second housing 41.

[0070] In some embodiments, as shown in Figures 5 to 9 , the fastening assembly 5 further includes a first connector 52, which is connected to the first housing 1. As shown in Figures 5 and 6 , the first connector 52 is provided with a through hole 521. The through hole 521 is provided corresponding to the second opening 14, so that the fastener 51 passes through the second opening 14 and the through hole 521, allowing the fastener 51 to pass through the through hole 521 and connect with the first connector 52, thereby connecting the fastener 51 to the first housing 1 through the connection with the first connector 52.

[0071] 5 to 9 , the fastening assembly 5 further includes a second connecting member 53 . The second connecting member 53 is disposed in the second housing 41 and above the first opening 4141 . The second connecting member 53 is configured to connect to the fastener 51 .

[0072] A first opening 4141 is provided at the top of the fastener 51, and the second connecting member 53 is connected to the top of the fastener 51 to connect at least part of the second shell 41 to the fastener 51. The bottom of the fastener 51 is inserted into the through hole 521, and the fastener 51 is connected to the first connecting member 52 so that the fastener 51 is connected to the second shell 41.

[0073] By connecting the fan assembly 4 to the top of the first housing 1 of the outdoor unit 20, the rotation of the second fan 42 in the fan assembly 4 reduces the air resistance during the rotation of the first fan 3, thereby increasing the rotational work of the first fan 3 and the air output of the outdoor unit 20. This allows the outdoor unit 20 to maintain a preset air output even in an environment with high external static pressure, thereby improving the outdoor unit's ability to withstand static pressure. The present invention facilitates installation by connecting the fan assembly 4 to the top of the first housing 1 and facilitates disassembly and maintenance of the fan assembly 4.

[0074] 5 to 9 , the first connector 52 is disposed in the first opening 4141 and further includes a first mating portion 522 . The first mating portion 522 extends toward the middle of the through hole 521 and is disposed on the first connector 52 .

[0075] In some embodiments, as shown in FIG7 , the fastener 51 further includes a second mating portion 511 (e.g., a recessed portion). The second mating portion 511 is recessed into the interior of the fastener 51. The bottom of the fastener 51 is inserted into the through hole 521, and the first mating portion 522 is mated with the second mating portion 511 to connect the fastener 51 to the first housing 1. The first mating portion 522 is inserted into the second mating portion 511 to limit the vertical movement of the fastener 51. When the second mating portion 511 is disengaged from the first mating portion 522 by external force, the fastener 51 is disconnected from the first connector 52, and the fan assembly 4 can be disassembled for maintenance.

[0076] In some embodiments, as shown in Figure 6, the first matching portion 522 (such as a protrusion) protrudes toward the middle near the through hole 521 so that the first matching portion 522 matches with the second matching portion 511, making it easier for the first matching portion 522 to be inserted into the second matching portion 511 to avoid the fastener 51 from moving up and down.

[0077] The second connecting member 53 is connected to the top of the fastener 51 to connect at least part of the second shell 41 to the fastener 51. The bottom of the fastener 51 is inserted into the through hole 521. The first matching portion 522 matches the second matching portion 511 to connect the fastener 51 to the first shell 1.

[0078] In some embodiments, as shown in FIG. 5 , the first housing 1 further includes a top plate 15 , at least a portion of the top plate 15 is located on the top of the first housing 1 , and the second opening 14 is provided on the top plate 15 .

[0079] In some embodiments, as shown in FIG. 5 , the second housing 41 further includes a connecting plate 414 . At least a portion of the connecting plate 414 is located at the bottom of the first housing 1 , and the first opening 4141 is provided on the connecting plate 414 .

[0080] The second connecting member 53 is connected to the top of the fastener 51 to connect the connecting plate 414 to the fastener 51, and the bottom of the fastener 51 is inserted into the through hole 521 and the second opening 14 to connect the fastener 51 to the first connecting member 52. The first shell 1 and the second shell 41 are connected through the fastening assembly 5 to achieve a detachable connection, which is convenient for optional installation of the fan assembly 4 and disassembly of the fan assembly 4 for maintenance.

[0081] In some embodiments, as shown in FIG7 , the fastener 51 further includes a first connecting portion 512 (e.g., a first boss), which is located above the second mating portion 511. When the second connecting member 53 is connected to the top of the fastener 51, at least a portion of the second housing 41 is located between the second connecting member 53 and the first connecting portion 512. The second connecting member 53 is connected to the top of the fastener 51, and can compress a portion of the second housing 41 and the first connecting portion 512, thereby making the connection between the second housing 41 and the fastener 51 tighter.

[0082] In some embodiments, when the fastener 51 is installed with the first shell 1 and the second shell 41, the axial direction of the fastener 51 is defined to be the same as the height direction of the first shell 1, the radial direction of the fastener 51 is perpendicular to the axial direction of the fastener 51, and the first connecting portion 512 is set to extend along the radial direction of the fastener 51.

[0083] In some embodiments, the first connection portion 512 is annular and is disposed around the fastener 51 to increase the contact area between the first connection portion 512 and the second shell 41 , thereby facilitating the connection between the second shell 41 and the first connection portion 512 .

[0084] In some embodiments, as shown in Figure 7, the fastener 51 also includes a second connecting portion 513 (such as a second boss). The second connecting portion 513 is located below the second matching portion 511. When the bottom of the fastener 51 is inserted into the through hole 521, the first matching portion 522 can produce elastic deformation to abut against the second connecting portion 513. When the second matching portion 511 is matched with the first matching portion 522, the first matching portion 522 is located between the first connecting portion 512 and the second connecting portion 513. The first connecting portion 512 and the second connecting portion 513 are configured to limit the first matching portion 522 and prevent the first matching portion 522 from falling off from the second matching portion 511. In this way, it is conducive to achieving the connection between the fastener 51 and the first connecting member 52.

[0085] In some embodiments, as shown in Figures 5, 8, and 9, the fastening assembly 5 further includes a shock-absorbing pad 54. The shock-absorbing pad 54 is disposed between the first housing 1 and the second housing 41. The shock-absorbing pad 54 is configured to reduce vibration and noise caused by the operation of the outdoor unit 20 after the first housing 1 and the second housing 41 are connected. The shock-absorbing pad 54 can be made of a flexible material, such as rubber, to enhance shock absorption.

[0086] In some embodiments, as shown in Figures 5 and 8, the second housing 41 further includes a third connecting portion 415, which is disposed on the connecting plate 414 and protrudes away from the first housing 1. A third cavity 4151 is formed on a side of the third connecting portion 415 that is close to the first housing 1. The first opening 4141 is disposed on the third connecting portion 415, and the third cavity 4151 is in communication with the first opening 4141.

[0087] After the second housing 41 is connected to the first housing 1 via the fastening assembly 5, at least a portion of the shock-absorbing pad 54 is located within the third cavity 4151. The third cavity 4151 is configured to accommodate the shock-absorbing pad 54, thereby reducing the connection gap between the first housing 1 and the second housing 41 and improving the connection strength between the second housing 41 and the first housing 1. The third cavity 4151 is also configured to accommodate the first connecting portion 512, thereby reducing the connection gap between the first housing 1 and the second housing 41.

[0088] In some embodiments, the height of the shock-absorbing pad 54 is substantially the same as the height of the first housing 1, and the depth of the third cavity 4151 is substantially the same as the height of the shock-absorbing pad 54. The height of the shock-absorbing pad 54 may be greater than the depth of the third cavity 4151 to cushion the compression of the shock-absorbing pad 54 caused by the weight of the fan assembly 4, thereby improving the shock-absorbing effect of the shock-absorbing pad 54 and enhancing installation convenience and reliability.

[0089] The height of the shock-absorbing pad 54 refers to the distance between the orthographic projections of the two points furthest apart in the height direction of the shock-absorbing pad 54, onto a plane parallel to the height direction of the shock-absorbing pad 54. The depth of the third cavity 4151 refers to the distance between the orthographic projections of the two points furthest apart in the depth direction of the third cavity 4151, onto a plane parallel to the depth direction of the third cavity 4151.

[0090] In some embodiments, as shown in FIG6 , the first connector 52 further includes a stopper 523. The stopper 523 is disposed on the periphery of the first connector 52 and cooperates with the second opening 14 to confine the first connector 52 within the second opening 14. The stopper 523 may be recessed toward the interior of the first connector 52, facilitating the first connector 52 to be engaged with the first housing 1 at the first opening 4141 through the stopper 523.

[0091] In some embodiments, the limiting portion 523 may be an annular groove surrounding the periphery of the first connecting member 52 so that the first shell 1 around the first opening 4141 can be installed into the annular groove to connect the first connecting member 52 and the first shell 1.

[0092] In some embodiments, the first mating portion 522 and the first connector 52 can be integrally formed to enhance the connection strength between the first mating portion 522 and the first connector 52. The first mating portion 522 is made of a flexible material, so that when the bottom of the fastener 51 is inserted into the through hole 521, the first mating portion 522 can be elastically deformed to abut against the second connector 513. When the first mating portion 522 is mated with the second mating portion 511, the first mating portion 522 and the second mating portion 511 cooperate to act as a limiter, preventing the connector from shaking, facilitating the connection between the fastener 51 and the first connector 52, and preventing the fastener 51 from becoming disconnected from the first connector 52.

[0093] In some embodiments, the second fan 42 is arranged above the first fan 3, and the rotation axis of the first fan 3 is arranged to coincide with the rotation axis of the second fan 42, so that the first fan 3 and the second fan 42 are aligned in the height direction of the first shell 1, which can reduce the wind resistance. The first fan 3 is more responsible for suction, and the second fan 42 is more responsible for blowing, which can improve the air volume of the whole machine and make the air outlet smoother.

[0094] In some embodiments, the second connecting member 53 may be a nut. The top of the fastener 51 is provided with a thread, and the nut cooperates with the thread, and the nut is rotated to press the second housing 41 downward, so that the second housing 41 is tightly connected to the first housing 1.

[0095] In some embodiments, the fastener 51 may be a threaded connector, for example, a bolt, a screw, or a screw.

[0096] In some embodiments, the outer edge of the first connecting member 52 may be circular and extend along the edge of the second opening 14 to facilitate better connection between the first connecting member 52 and the second shell 41 at the second opening 14 .

[0097] In some embodiments, the outer edge of the first connecting member 52 may be in an arc shape extending along the edge of the second opening 14 to facilitate the connection of the second connecting member 53 to the second shell 41 at the second opening 14 .

[0098] In some embodiments, the outdoor unit 20 includes a plurality of fastening components 5. For example, the outdoor unit 20 includes four fastening components 5, and the four fastening components 5 are respectively arranged on the four sides or four corners of the outdoor unit to improve the connection stability of the fan component 4.

[0099] In some embodiments, when installing the fan assembly 4, first pass the top of the fastener 51 through the first opening 4141, and fix the second connecting member 53 to the top of the fastener 51, so that the fastener 51 is connected to the second shell 41. Afterwards, install the first connecting member 52 in the second opening 14, and install the shock-absorbing pad 54 above the first connecting member 52. Hang the fan assembly 4 above the outdoor unit, and match the bottom of the fastener 51 with the through hole 521 and the second opening 14. The fastener 51 is inserted into the through hole 521 and the second opening 14 by the gravity of the fan assembly 4 itself, until the first matching portion 522 matches the second matching portion 511, thereby limiting the displacement of the fan assembly 4 and achieving the fixation of the fan assembly 4.

[0100] In some embodiments, when the fan assembly 4 needs to be disassembled for maintenance, the second connecting member 53 is removed and the fan assembly 4 can be separated from the first housing 1 by applying external force. After the fan assembly 4 is repaired, the fan assembly 4 is hoisted above the first housing 1, the first opening 4141 is assembled on the top of the fastener 51, and the second connecting member 53 is installed to complete the installation. The fastening assembly 5 can facilitate the installation and removal of the fan assembly 4.

[0101] In some embodiments, as shown in Figure 10, the second fan 42 and the first fan 3 can rotate simultaneously, and the second fan 42 can rotate in the same direction or in an opposite direction relative to the first fan 3. The second fan 42 is also configured to drive the air in the first chamber 11 into the second chamber 413 through the second air inlet 411, and then be discharged to the outside through the second air outlet 412.

[0102] Increasing the speed of the second fan 42 can increase the air volume and reduce the air resistance of the first fan 3 during rotation, thereby reducing the current of the first fan 3. This allows the rated power of the first fan 3 to be lower than the rated power of the second fan 42, thereby reducing the cost of the first fan 3. Furthermore, by providing the second fan 42, the air volume flowing out of the second air outlet 412 of the outdoor unit 20 can be increased.

[0103] In some embodiments, the at least one second fan 42 includes a plurality of second fans 42, the first fan 3 includes a plurality of first fans 3, and the plurality of second fans 42 respectively correspond to the plurality of first fans 3. The number of second fans 42 is the same as the number of first fans 3, and the rotation axis of one second fan 42 is arranged to coincide with the rotation axis of the first fan 3 corresponding to the second fan 42. In this way, in the height direction of the first housing 1, the first fan 3 and the second fan 42 are aligned, which can reduce the wind resistance. The first fan 3 is more responsible for the suction function, and the second fan 42 is more responsible for the blowing function, which can optimize the air volume of the entire machine and make the wind output smoother.

[0104] In some embodiments, a plane parallel to the height direction of the first shell 1 is defined as a first plane, the highest point of the projection of the first fan 3 on the first plane is defined as a first point, and the highest point of the projection of the second fan 42 on the first plane is defined as a second point.

[0105] A plane parallel to the width direction of the first shell 1 is defined as the second plane, a projection of the rotation center of the first fan 3 on the second plane is defined as the third point, and a projection of the rotation center of the second fan 42 on the second plane is defined as the fourth point.

[0106] As shown in Figures 11 and 12 , the distance between the first point and the second point in the height direction of the first housing 1 is defined as a first distance H1, and the distance between the third point and the fourth point in the width direction of the first housing 1 is defined as a second distance H2.

[0107] The left-right spacing between the first fan 3 and the second fan 42 is limited by the size of the first shell 1 and the second shell 41 of the outdoor unit, and the adjustable range is relatively small. However, the vertical spacing between the first fan 3 and the second fan 42 has a larger adjustment range. Therefore, when the first distance H1 is too small, the mutual interference between the wind fields of the first fan 3 and the second fan 42 increases, causing the air volume at the second air outlet 412 to decrease while the noise of the outdoor unit 20 also increases. In order to increase the air volume at the second air outlet 412 while reducing the noise of the outdoor unit 20, the first distance H1 can be greater than or equal to 0.6 times the second distance (H1≥0.6H2), or the first distance H1 can be greater than or equal to 0.7 times the second distance (H1≥0.7H2), or the first distance H1 can be greater than or equal to 0.8 times the second distance (H1≥0.8H2).

[0108] When the first distance H1 is too large, the distance between the first fan 3 and the second fan 42 increases, resulting in a reduced mutual benefit between the first fan 3 and the second fan 42. The second fan 42's ability to share the wind resistance of the first fan 3 decreases, thereby reducing the overall static pressure resistance of the outdoor unit 20. Therefore, H1 can be less than or equal to 0.7H2. H1 can be less than or equal to 0.8H2. H1 can be less than H2. The first distance H1 can be less than or equal to 0.6 times the second distance (H1≤0.6H2), or the first distance H1 can be less than or equal to 0.7 times the second distance (H1≤0.7H2), or the first distance H1 can be less than or equal to 0.8 times the second distance (H1≤0.8H2), to improve the static pressure resistance of the outdoor unit 20.

[0109] In some embodiments, as shown in FIG. 12 , the shortest distance between the rotation center of the second fan 42 and the inner wall of the second housing 41 in the width direction of the second housing 41 is defined as a third distance H3 .

[0110] When the third distance H3 is too small, the size of the second fan of the second fan 42 may be reduced, and the air output of the second fan 42 may be reduced. Therefore, the third distance H3 may be greater than or equal to 0.6 times the first distance (H3 ≥ 0.6H1), or greater than or equal to 0.7 times the first distance (H3 ≥ 0.7H1), or greater than or equal to 0.8 times the first distance (H3 ≥ 0.8H1), to increase the air output of the second fan 42.

[0111] When the third distance H3 is too large, the second fan 42 cannot effectively drive the air flow in the second chamber 413, thereby increasing the rotational resistance of the second fan 42. Therefore, the third distance H3 can be less than or equal to 0.7 times the first distance (H3 ≤ 0.7H1), or less than or equal to 0.8 times the first distance (H3 ≤ 0.8H1), or less than or equal to 0.9 times the first distance (H3 ≤ 0.9H1), to increase the air output of the second fan 42 and improve the air flow driven by the second fan 42.

[0112] In some embodiments, the first fan 3 includes a first motor, which is disposed in the first housing 1 . The first motor is connected to the first housing 1 via a first sheet metal component, and an output shaft of the first motor extends toward the second housing 41 .

[0113] The first blower 3 further includes a first fan, which is located on a side of the first motor close to the second housing 41 . The first fan is connected to the motor output shaft of the first motor, and the first motor drives the first fan to rotate.

[0114] In some embodiments, the second fan 42 further includes a second motor, which is disposed in the second housing 41 and connected to the second housing 41 via a second sheet metal component. The output shaft of the second motor extends toward the top of the second housing 41 .

[0115] The second blower 42 further includes a second fan, which is located on a side of the second motor away from the first housing 1 . The second fan is connected to the motor output shaft of the second motor, and the second motor drives the second fan to rotate.

[0116] The rotation axis of the first fan 3 is arranged along the height direction of the first shell 1, and the rotation axis of the second fan 42 is arranged along the height direction of the second shell 41. The rotation axis of the first fan 3 and the rotation axis of the second fan 42 are arranged in parallel to reduce the mutual interference of the wind fields between the first fan 3 and the second fan 42, so that the air outlet direction of the first fan 3 and the air outlet direction of the second fan 42 are the same.

[0117] In some embodiments, as shown in Figures 13 to 17, the second shell 41 also includes at least one air duct plate 7, which is arranged around the periphery of the second fan 42, the top end of the air duct plate 7 is connected to the second air outlet 412, and the bottom end of the air duct plate 7 is connected to the second air inlet 411.

[0118] The number of the air duct plates 7 is the same as the number of the second fans 42 . Adjacent second fans 42 are separated by the air duct plates 7 , so that the second fans 42 have separate air ducts, thereby avoiding mutual interference between the wind fields of adjacent second fans 42 .

[0119] In some embodiments, as shown in Figure 13, the air duct plate 7 separates the second cavity 413 to form an air outlet cavity 92, and the second fan 42 is arranged in the air outlet cavity 92. The bottom of the air outlet cavity 92 is connected to the second air inlet 411, and the top of the air outlet cavity 92 is connected to the second air outlet 412.

[0120] In some embodiments, as shown in FIG. 13 , the air duct plate 7 divides the second cavity 413 into a heat dissipation cavity 91 , and the heat dissipation cavity 91 is located at the periphery of the air outlet cavity 92 .

[0121] In some embodiments, as shown in FIG13 , the outdoor unit 20 further includes at least one electrical box 6 . The electrical box 6 is connected to the second housing 41 and disposed in the heat dissipation cavity 91 to save space and avoid interference with the air flow of the outdoor unit 20 .

[0122] In some embodiments, the first motor includes a first motor housing, and a fixed end is provided on the periphery of the first motor housing, and the fixed end is connected to the first sheet metal component.

[0123] The opposite ends of the first sheet metal member are connected to the inner walls of the second housing 41 on opposite sides. The first motor is fixed to the two first sheet metal members. For example, the first motor housing is provided with four fixing ends, and one first sheet metal member is fixed with two fixing ends. The fixing ends secure the first motor to the two first sheet metal members, thereby improving the connection stability of the first motor.

[0124] In some embodiments, as shown in FIG. 13 to FIG. 14 and FIG. 16 to FIG. 17 , the electrical box 6 may be electrically connected to at least one of the first fan 3 and the second fan 42 to control the rotation of at least one of the first fan 3 and the second fan 42 .

[0125] In some embodiments, as shown in Figure 13, the air outlet cavity 92 and the heat dissipation air cavity 91 can be arranged in communication so that the air in the air outlet cavity 92 flows into the heat dissipation air cavity 91 driven by at least one of the first fan 3 and the second fan 42. When the air flowing into the heat dissipation air cavity 91 flows through the electrical box 6, it exchanges heat with the electrical box 6 to take away the heat of the electrical box 6, thereby preventing the electrical box 6 from being damaged due to excessive heat.

[0126] In some embodiments, as shown in Figure 13, the air outlet cavity 92 and the heat dissipation air cavity 91 can be arranged in communication, so that the air in the heat dissipation air cavity 91 flows into the air outlet cavity 92 under the drive of at least one of the first fan 3 and the second fan 42, and at least one of the first fan 3 and the second fan 42 rotates to drive the air in the heat dissipation air cavity 91 to flow into the air outlet cavity 92. When the air in the heat dissipation air cavity 91 flows through the electrical box 6, it exchanges heat with the electrical box 6 to take away the heat of the electrical box 6, thereby preventing the electrical box 6 from being damaged due to excessive heat.

[0127] In some embodiments, the air duct plate 7 is cylindrical, the air outlet cavity 92 is located on the inner side of the air duct plate 7, and the heat dissipation air cavity 91 is located on the outer side of the air duct plate 7. The number of air duct plates 7 corresponds to the number of second fans 42. Adjacent second fans 42 are separated by the air duct plates 7, so that the second fans 42 have separate air ducts, thereby avoiding mutual interference between the wind fields of adjacent second fans 42.

[0128] In some embodiments, as shown in Figures 16 to 19, the electrical box 6 includes a box bottom plate 61, which is located at the bottom of the electrical box 6. A first ventilation hole 611 is provided on the box bottom plate 61. The first ventilation hole 611 is connected to the heat dissipation air cavity 91, so that the air in the heat dissipation air cavity 91 enters the electrical box 6 through the first ventilation hole 611, and the heat in the electrical box 6 is taken away by the air flow.

[0129] In some embodiments, as shown in FIG19 , the electrical box 6 includes a top plate 62. The top plate 62 is located at the top of the electrical box 6 and is provided with a second vent 621. The second vent 621 is connected to the first vent 611 inside the electrical box 6, and the second vent 621 is connected to the second air outlet 412. The air in the heat dissipation air cavity 91 can enter the electrical box 6 through the first vent. Under the driving action of at least one of the first fan 3 and the second fan 42, the second air outlet 412 is at a negative pressure. The air in the electrical box 6 flows out of the electrical box 6 through the second vent 621. The air flowing out of the electrical box 6 flows to the second air outlet 412 at a negative pressure. When the air flows through the electrical box 6, it can remove the heat in the electrical box 6, thereby reducing the temperature of the electrical box 6.

[0130] In some embodiments, as shown in Figures 17 to 19, the electrical box 6 includes a baffle 63, which is located between the box top plate 62 and the second air inlet 411. The baffle 63 is configured to block the second ventilation hole 621 to prevent rainwater, sand and dust from falling into the electrical box 6 through the second air inlet 411 and the second ventilation hole 621, thereby avoiding short circuits and open circuits of electrical components in the electrical box 6, thereby improving the safety and service life of the electrical box 6.

[0131] As shown in Figure 19, a heat dissipation duct 631 is provided between the baffle plate 63 and the box top plate 62. The second ventilation hole 621 is connected to the second air outlet 412 through the heat dissipation duct 631. The air in the electrical box 6 can flow out of the electrical box 6 through the second ventilation hole 621 and then flow out of the second air outlet 412 through the heat dissipation duct 631.

[0132] In some embodiments, as shown in FIG19 , the shielding plate 63 includes a shielding main plate 632 , which is located between the top plate 62 and the second air inlet 411 . The heat dissipation duct 631 is located below the shielding main plate 632 .

[0133] In some embodiments, the shielding main plate 632 is a flat plate that is tilted relative to a horizontal plane, so that rainwater falling on the shielding main plate 632 can flow away along the tilted shielding main plate 632 .

[0134] In some embodiments, as shown in Figure 19, the shielding plate 63 includes a mounting plate 633, which is connected to the shielding main board 632. The mounting plate 633 is bent and extended to one side close to the heat dissipation duct 631, so that rainwater falling on the shielding main board 632 flows along the shielding main board 632 to the mounting plate 633. The mounting plate 633 guides the rainwater to the outside of the electrical box 6 to prevent the rainwater from falling into the electrical box 6.

[0135] In some embodiments, the mounting plate 633 and the shielding main plate 632 are integrated into one piece, and the mounting plate 633 is bent relative to the shielding main plate 632 through a bending process.

[0136] In some embodiments, the mounting plate 633 and the shielding main board 632 are connected by welding, and the mounting plate 633 and the shielding main board 632 are connected as one body through a welding process.

[0137] In some embodiments, as shown in FIG19 , the outdoor unit 20 is provided with a connecting base plate 81 that is connected to the bottom of the electrical box 6. One end of the connecting base plate 81 is connected to the box bottom plate 61, and the other end of the connecting base plate 81 is connected to the second housing 41, thereby securing the electrical box 6 to the second housing 41.

[0138] In some embodiments, one end of the connecting bottom plate 81 connected to the box bottom plate 61 is connected to the box bottom plate 61 by screw connection.

[0139] In some embodiments, one end of the connecting base plate 81 connected to the second shell 41 is connected to the second shell 41 by screw connection.

[0140] In some embodiments, one end of the connecting bottom plate 81 connected to the box bottom plate 61 is connected to the box bottom plate 61 by rivets.

[0141] In some embodiments, one end of the connecting base plate 81 connected to the second shell 41 is connected to the second shell 41 by rivets.

[0142] In some embodiments, the connecting base plate 81 is a sheet metal part, and the connecting base plate 81 can be manufactured by a bending process.

[0143] In some embodiments, as shown in Figure 19, a connecting top plate 82 is provided in the outdoor unit 20, and the connecting top plate 82 is located above the baffle plate 63. One end of the connecting top plate 82 is connected to the baffle plate 63, and the other end of the connecting top plate 82 is connected to the second shell 41, so as to fix the electrical box 6 to the second shell 41.

[0144] The top and bottom connecting plates 82 and 81 are connected to each other to securely connect the electrical box 6 to the second housing 41. The top and bottom connecting plates 81 and 82 are connected to the electrical box 6 and the second housing 41 to support the fan assembly 4.

[0145] In some embodiments, as shown in FIG. 16 and FIG. 17 , a third ventilation hole 71 is provided on the air duct plate 7 . The third ventilation hole 71 is provided corresponding to the first ventilation hole 611 . The third ventilation hole 71 communicates with the first air outlet 13 and the heat dissipation air cavity 91 .

[0146] Driven by at least one of the first fan 3 and the second fan 42, the air in the first cavity 11 can flow into the heat dissipation air cavity 91 through the first air outlet 13 and the third ventilation port. The air flowing into the heat dissipation air cavity 91 flows into the electrical box 6 through the first ventilation hole 611, and flows to the second air outlet 412 through the second ventilation hole 621. When the air flows through the electrical box 6, it can take away the heat in the electrical box 6 and reduce the temperature of the electrical box 6.

[0147] By providing the third ventilation hole 71 , the air in the first cavity 11 can be brought into the heat dissipation air cavity 91 , increasing the air volume in the heat dissipation air cavity 91 , so that more air can be brought into the electrical box 6 , thereby increasing the heat dissipation effect of the electrical box 6 .

[0148] In some embodiments, as shown in Figures 17 to 19 , the air duct plate 7 is provided with a fourth vent 72, which communicates with the second vent 621 and further connects to the heat dissipation air cavity 91 and the air outlet cavity 92. Air flows into the electrical box 6 through the first air outlet 13, the third vent 71, and the first vent 611, then out of the electrical box 6 through the second vent 621, through the fourth vent 72, into the air outlet cavity 92, and then to the second air outlet 412. As air flows through the electrical box 6, it removes heat from the box, lowering its temperature and preventing it from overheating.

[0149] By setting the fourth ventilation hole 72, the wind coming out of the inside of the electrical box 6 will be sucked into the air outlet cavity 92 through the fourth ventilation hole 72, and blown out from the second air outlet 412 through the second fan 42, thereby increasing the air volume and flow speed in the heat dissipation air cavity 91. At this time, the air volume is large and the wind speed is fast, which can increase the heat dissipation effect on the electrical box 6.

[0150] In some embodiments, in the height direction of the second housing 41 , the fourth ventilation hole 72 is arranged higher than the electrical box 6 , so that the air flowing out of the electrical box 6 flows toward the fourth ventilation hole 72 .

[0151] In some embodiments, as shown in Figures 13, 16, and 17, the at least one electrical box 6 includes multiple electrical boxes 6. For example, the multiple electrical boxes 6 include two electrical boxes 6. The two electrical boxes 6 are symmetrically arranged within the second housing 41 and are each disposed within the heat dissipation air cavity 91. The electrical boxes 6 are disposed within the heat dissipation air cavity 91, fully utilizing the space within the fan assembly 4, effectively controlling the volume of the fan assembly 4, and effectively reducing product costs.

[0152] In some embodiments, as shown in Figures 10 to 12, the number of first fans 3 and second fans 42 is the same. For example, when one first fan 3 is provided in the outdoor unit 20, one second fan 42 is provided accordingly. When two first fans 3 are provided in the outdoor unit 20, two second fans 42 are also provided accordingly.

[0153] In some embodiments, the outdoor unit 20 includes a controller having at least one rated air volume interval. The controller controls the first fan 3 and the second fan 42 to start, and the first fan 3 and the second fan 42 rotate in the same direction.

[0154] In some embodiments, the controller includes a detection component configured to detect static pressure air volume.

[0155] In some embodiments, when the controller detects that the static pressure in the outdoor unit 20 installation scenario is less than the lower limit of the first static pressure range, the fan assembly 4 can be omitted, and in this case, the second fan 42 is not required. Because the static pressure is relatively low at this time, the first fan 3 can meet the static pressure resistance of the outdoor unit 20. For example, the first static pressure range is greater than or equal to 50 Pa and less than 100 Pa.

[0156] In some embodiments, when the outdoor unit 20 includes a first fan 3 and a second fan 42, when the controller detects that the static pressure in the installation scenario of the outdoor unit 20 is less than the lower limit of the first static pressure range, the first fan 3 is activated and the second fan 42 is deactivated. Because the static pressure is relatively low at this time, activating only the first fan 3 is sufficient to meet the static pressure resistance of the outdoor unit 20, thereby saving energy consumption.

[0157] In some embodiments, the controller detects the actual air volume of the outdoor unit 20 and selects a corresponding rated air volume range according to the static pressure outside the unit.

[0158] When the actual air volume is too high, that is, when the actual air volume is higher than the upper limit of the selected rated air volume range, the controller controls the rotation speeds of the first fan 3 and the second fan 42 to decrease by the same number of revolutions, thereby reducing the air volume. When the actual air volume is too low, that is, when the actual air volume is lower than the lower limit of the selected rated air volume range, the controller controls the rotation speeds of the first fan 3 and the second fan 42 to increase by the same number of revolutions, thereby increasing the air volume.

[0159] The actual air volume is the actual air volume flowing through the second air outlet 412 , and the rated air volume range is the range of the rated air volume flowing through the second air outlet 412 .

[0160] It should be noted that the first fan 3 and the second fan 42 run at the same speed, the control logic is simple and easy to implement, can quickly respond to high static pressure conditions outside the machine, improve the air volume capacity of the unit, and the control system has high stability.

[0161] Because the first and second fans 3 and 42 operate at the same speed, there is minimal interference between them, resulting in highly stable system operation. This reduces noise levels, steadily improves the outdoor unit's ability to withstand external static pressure, and enhances its airflow and capacity under high external static pressure. When static pressure fluctuates, the speeds of the first and second fans 3 and 42 can be quickly adjusted to meet the operating requirements of the air conditioner 1000.

[0162] In some embodiments, the first fan 3 and the second fan 42 are turned on and off synchronously and set at the same speed. The control logic is simple and easy to implement. It can quickly respond to high static pressure conditions, improve the air volume capacity of the air conditioner 1000, and the control system has high stability.

[0163] In some embodiments, a preset speed is pre-set, and the preset speed is an initial maximum speed. When the first fan 3 and the second fan 42 are started synchronously, and the first fan 3 and the second fan 42 respectively reach the preset speed, the first fan 3 and the second fan 42 maintain the preset speed.

[0164] In some embodiments, a corresponding rated air volume range is selected according to the static pressure. The actual air volume of the outdoor unit is detected.

[0165] In some embodiments, a first rated air volume interval is set in the controller, and when the static pressure is a value within the first static pressure interval, the rated air volume interval is selected as the first rated air volume interval.

[0166] In some embodiments, the air conditioner 1000 has a rated air volume value, which is the air volume value required for the outdoor unit 20 to operate.

[0167] In some embodiments, the first external static pressure interval ranges from 50 Pa to 100 Pa, the upper limit of the first rated air volume interval is the rated air volume value, and the lower limit of the first rated air volume interval is 0.9 times the rated air volume value.

[0168] In some embodiments, a second rated air volume interval is set in the controller, and when the static pressure is a value within the second static pressure interval, the rated air volume interval is selected as the second rated air volume interval.

[0169] The lower limit value of the second external static pressure interval is higher than the upper limit value of the first static pressure interval, and the lower limit value of the second rated air volume interval is lower than the lower limit value of the first rated air volume interval.

[0170] In some embodiments, the upper limit value of the second rated air volume interval is equal to the upper limit value of the first rated air volume interval.

[0171] In some embodiments, the second static pressure interval ranges from 100 Pa to 150 Pa, the upper limit of the second rated air volume interval is the rated air volume value, and the lower limit of the second rated air volume interval is 0.8 times the rated air volume value.

[0172] In some embodiments, a third rated air volume interval is set in the controller. When the static pressure outside the machine is a value within the third static pressure interval, the rated air volume interval is selected as the third rated air volume interval.

[0173] The lower limit value of the third static pressure interval is higher than the upper limit value of the second static pressure interval, and the lower limit value of the third rated air volume interval is lower than the lower limit value of the second rated air volume interval.

[0174] In some embodiments, the upper limit value of the third rated air volume interval is equal to the upper limit value of the first rated air volume interval.

[0175] In some embodiments, the third static pressure interval is greater than 150 Pa, the upper limit value of the third rated air volume interval is the rated air volume value, and the lower limit value of the second rated air volume interval is 0.7 times the rated air volume value.

[0176] As the static pressure of the outside air corresponding to the outdoor unit 20 increases, the actual air volume of the air conditioner 1000 decreases while the speeds of the first and second fans 3 and 42 remain unchanged. It is necessary to increase the speeds of the first and second fans 3 and 42 to maintain the air volume, but this becomes increasingly difficult. Therefore, as the static pressure increases, the air volume of the unit is allowed to decrease to a certain extent in order to more reasonably control the air volume output of the outdoor unit 20.

[0177] In some embodiments, when the actual air output is higher than the upper limit value of the selected rated air volume range, and the actual air output is lower than X times the upper limit value of the selected rated air volume range, the controller controls the speed of the first fan 3 and the second fan 42 to reduce the first preset number of revolutions.

[0178] X is a constant, and the value of X may be 1.1. The first preset number of revolutions may be set to 20 revolutions.

[0179] That is, when the actual air volume is higher than the rated air volume, and the difference between the actual air volume and the rated air volume is within 10%, the speed of the upper and lower fans will be reduced by 20 revolutions simultaneously.

[0180] The controller controls the rotation speed of the first fan 3 and the second fan 42 to be reduced by the same number of revolutions, thereby reducing the air output. The first fan 3 and the second fan 42 run at the same speed, the control logic is simple and easy to implement, and the control system has high stability.

[0181] In some embodiments, when the actual air volume is greater than or equal to X times the upper limit of the selected rated air volume range, and the actual air volume is less than or equal to Y times the upper limit of the selected rated air volume range, the speed of the first fan 3 and the second fan 42 are controlled to be reduced by a second preset number of revolutions respectively.

[0182] X and Y are constants, X<Y, X can be 1.1, and Y can be 1.2. The first preset number of revolutions is less than the second preset number of revolutions, and the second preset number of revolutions can be set to 50 revolutions.

[0183] That is, when the actual air volume is higher than the rated air volume, and the difference between the actual air volume and the rated air volume is within 10%-20%, that is, 10%≤[(actual air volume-rated air volume) / rated air volume]≤20%, the rotational speed of the first fan 3 and the second fan 42 is synchronously reduced by 50 revolutions.

[0184] When the actual airflow exceeds the upper limit of the selected rated airflow range, the speeds of the first and second fans 3 and 42 need to be reduced simultaneously to reduce the airflow. The first and second fans 3 and 42 operate at the same speed, which simplifies the control logic and makes it easy to implement, resulting in a highly stable control system.

[0185] In some embodiments, when the actual air volume is higher than Y times the upper limit of the selected rated air volume range, the controller controls the rotation speeds of the first fan 3 and the second fan 42 to decrease by a third preset number of revolutions. The second preset number of revolutions is smaller than the third preset number of revolutions.

[0186] Y is a constant, and the value of Y can be 1.2. The third preset speed can be set to 100 speeds.

[0187] That is, when the actual air volume is higher than the rated air volume, and the difference between the actual air volume and the rated air volume is more than 20%, the rotation speeds of the first fan 3 and the second fan 42 are synchronously reduced by 100 revolutions.

[0188] When the actual air volume is significantly higher than the selected rated air volume range, the speeds of first fan 3 and second fan 42 are simultaneously reduced based on the difference between the actual air volume and the selected rated air volume range, thereby reducing the air volume. The first and second fans 3 and 42 operate at the same speed, making the control logic simple and easy to implement, and the control system highly stable.

[0189] In some embodiments, when it is detected that the actual air volume is within the selected rated air volume range, the first fan 3 and the second fan 42 are controlled to operate at the current rotation speed.

[0190] In some embodiments, when the actual air volume is lower than the lower limit of the selected rated air volume range, and the actual air volume is higher than Z times the lower limit of the selected rated air volume range, the controller controls the speed of the first fan 3 and the second fan 42 to increase by a first preset number of revolutions. Z is a constant, and Z can be 0.9. The first preset number of revolutions can be set to 20 revolutions.

[0191] The speeds of the first and second fans 3 and 42 are controlled to increase by the same number of revolutions, thereby increasing the air output. The first and second fans 3 and 42 operate at the same speed, and the control logic is simple and easy to implement. This allows for rapid response to high static pressure conditions outside the unit, improves the unit's airflow capacity, and provides a highly stable control system.

[0192] In some embodiments, when the actual air output is less than or equal to Z times the lower limit value of the selected rated air volume range, and the actual air output is greater than or equal to W times the lower limit value of the selected rated air volume range, the controller controls the speed of the first fan 3 and the second fan 42 to increase by a second preset number of revolutions respectively.

[0193] Z and W are constants, W<Z, Z can be 0.9, and W can be 0.8. The first preset number of revolutions is less than the second preset number of revolutions, and the second preset number of revolutions can be set to 50 revolutions.

[0194] When the actual airflow falls below the selected rated airflow range, the speeds of first fan 3 and second fan 42 need to be increased simultaneously to increase the airflow. Operating first fan 3 and second fan 42 at the same speed creates a simple and easy-to-implement control logic, allowing for rapid response to high static pressure conditions outside the unit, improving the unit's airflow capacity, and ensuring high control system stability.

[0195] In some embodiments, when the actual air volume is lower than W times the lower limit of the selected rated air volume range, the rotation speeds of the first fan 3 and the second fan 42 are respectively increased by a third preset number of revolutions. The second preset number of revolutions is smaller than the third preset number of revolutions.

[0196] W is a constant, and a value of W may be 0.8. The third preset revolution may be set to 100 revolutions.

[0197] When the actual airflow falls below W times the lower limit of the selected rated airflow range (i.e., the actual airflow falls significantly below the selected rated airflow range), the speeds of first fan 3 and second fan 42 are simultaneously increased based on the difference between the actual airflow and the selected rated airflow range, thereby increasing the airflow. Operating first fan 3 and second fan 42 at the same speed creates simple and easy-to-implement control logic, enabling rapid response to high static pressure conditions, improving the airflow capacity of outdoor unit 20, and ensuring high control system stability.

[0198] In some embodiments, the controller is configured to: while controlling the speeds of the first fan 3 and the second fan 42 to increase synchronously, when the real-time current of the first fan 3 reaches the upper limit value of the rated current of the first fan 3, control the first fan 3 and the second fan 42 to operate at the current speeds respectively.

[0199] The rated current of the first fan 3 can be determined according to the type of the first fan 3 .

[0200] When the rotation speeds of the first fan 3 and the second fan 42 are increased to increase the air volume of the entire unit, the currents of the first fan 3 and the second fan 42 need to be monitored. When the current of one of the first fan 3 or the second fan 42 reaches the rated current, the rotation speeds of the first fan 3 and the second fan 42 cannot be increased again, and the air volume of the outdoor unit 20 reaches the upper limit.

[0201] In some embodiments, the controller is further configured to: while controlling the speeds of the first fan 3 and the second fan 42 to increase synchronously, when the real-time power of the first fan 3 reaches the upper limit of the rated power of the first fan 3, control the first fan 3 and the second fan 42 to operate at the current speeds respectively.

[0202] The rated power of the first fan 3 is determined according to the type of the first fan 3 .

[0203] When the rotation speeds of the first fan 3 and the second fan 42 are increased to increase the air volume of the entire machine, the power of the first fan 3 and the second fan 42 needs to be monitored. When the power of one of the first fan 3 or the second fan 42 reaches the rated power, the rotation speeds of the first fan 3 and the second fan 42 cannot be increased again, and the air volume of the outdoor unit 20 reaches the upper limit.

[0204] In some embodiments, the controller is further configured to: while controlling the speeds of the first fan 3 and the second fan 42 to increase synchronously, when the real-time current of the second fan 42 reaches the upper limit of the rated current of the second fan 42, control the first fan 3 and the second fan 42 to operate at the current speeds respectively.

[0205] The rated current of the second fan 42 is determined according to the type of the second fan 42 .

[0206] When the rotation speeds of the first fan 3 and the second fan 42 are increased to increase the air volume, the currents of the first fan 3 and the second fan 42 need to be monitored. When the current of one of the first fan 3 or the second fan 42 reaches the rated current, the rotation speeds of the first fan 3 and the second fan 42 cannot be increased again, and the air volume of the outdoor unit 20 reaches the upper limit.

[0207] In some embodiments, the controller is further configured to: while controlling the speeds of the first fan 3 and the second fan 42 to increase synchronously, when the real-time power of the second fan 42 reaches the upper limit of the rated power of the second fan 42, control the first fan 3 and the second fan 42 to operate at the current speeds respectively.

[0208] The rated power of the second fan 42 is determined according to the type of the second fan 42 .

[0209] When increasing the rotation speed of the first fan 3 and the second fan 42 to increase the air volume of the entire machine, it is necessary to monitor the power of the first fan 3 and the second fan 42. When the power of one of the first fan 3 or the second fan 42 reaches the rated power, the rotation speed of the first fan 3 and the second fan 42 cannot be increased again, and the air volume of the outdoor unit 20 reaches the upper limit.

[0210] In some embodiments, when the rotation speeds of the first fan 3 and the second fan 42 are reduced to reduce the air volume of the outdoor unit 20, it is not necessary to monitor the currents of the first fan 3 and the second fan 42 to simplify the operation logic.

[0211] In some embodiments, when the outdoor unit 20 includes a first fan 3 and a second fan 42, it is necessary to obtain the static pressure size of the installation scenario of the outdoor unit 20, the first rated current and first rated power of the first fan, the second rated current and second rated power of the second fan, and the rated air output of the unit.

[0212] Before the outdoor unit 20 is operated, the initial rated speed difference between the first fan 3 and the second fan 42 is set. The controller controls the first fan 3 and the second fan 42 to start, so that the first fan 3 reaches a first preset speed and the second fan 42 reaches a second preset speed. The second preset speed is greater than the first preset speed. The difference between the second preset speed and the first preset speed is the initial rated speed difference.

[0213] When the first fan 3 and the second fan 42 are started, the rated speed difference between the first fan 3 and the second fan 42 is kept unchanged, and the first fan 3 reaches a first preset speed and the second fan 42 reaches a second preset speed.

[0214] In some embodiments, when the first fan 3 reaches the first preset speed and the second fan 42 reaches the second preset speed, the controller determines the difference between the actual air output of the outdoor unit and the rated air output, and determines whether the current of the first fan exceeds the rated current of the first fan and whether the current of the second fan exceeds the rated current of the second fan.

[0215] When it is detected that the current of the first fan is less than or equal to the rated current of the first fan, and the current of the second fan is less than or equal to the rated current of the second fan, when the actual air output is lower than the rated air output, the controller controls the rotation speeds of the first fan 3 and the second fan 42 to increase by the same number of revolutions respectively, and then again judges the actual air output of the outdoor unit and the rated air output, and judges whether the current of the first fan exceeds the rated current of the first fan, and whether the current of the second fan exceeds the rated current of the second fan.

[0216] At this time, the current of the first fan 3 and the second fan 42 can be increased to increase the rotation speed of the first fan 3 and the second fan 42, thereby increasing the air output of the outdoor unit 20.

[0217] The speed of the second fan 42 is higher than that of the first fan 3, which can increase the air output, and the second fan 42 shares the fan resistance of the first fan 3, thereby reducing the current of the first fan 3. In this way, the capabilities of the first fan 3 and the second fan 42 can be fully utilized, and the first fan 3 can adopt a low-power and low-cost fan, so that the low-power and low-cost first fan 3 can play a greater role, which can reduce the cost of the outdoor unit 20 and increase the static pressure resistance of the outdoor unit 20 to cope with ultra-high static pressure conditions.

[0218] By controlling the first fan 3 and the second fan 42 to operate at different speeds, after the first fan 3 adopts a low-power and low-cost fan, it is easy to adjust the current or power of the first fan 3 and the second fan 42 to be consistent, so as to improve the current stability of the outdoor unit 20 and increase the service life of the outdoor unit 20.

[0219] When it is detected that the current of the first fan is less than or equal to the rated current of the first fan and the current of the second fan is less than or equal to the rated current of the second fan, when the actual air volume is higher than the rated air volume, the controller controls the rotation speed of the first fan 3 and the second fan 42 to be reduced by the same number of revolutions. After that, the actual air volume and the rated air volume of the outdoor unit 20 are judged again, and it is judged whether the current of the first fan 3 exceeds the rated current of the first fan 3 and whether the current of the second fan 42 exceeds the rated current of the second fan 42.

[0220] At this time, the current of the first fan 3 and the second fan 42 can be reduced to reduce the rotation speed of the first fan 3 and the second fan 42, thereby reducing the air output of the outdoor unit 20.

[0221] In some embodiments, when the first fan 3 reaches a first preset speed and the second fan 42 reaches a second preset speed, the controller determines the difference between the actual air output of the outdoor unit 20 and the rated air output, and determines whether the current of the first fan 3 exceeds the rated current of the first fan 3 and whether the current of the second fan 42 exceeds the rated current of the second fan 42.

[0222] When it is detected that the actual air volume has reached the rated air volume, and when it is detected that the current of the first fan 3 exceeds the rated current of the first fan 3 and the current of the second fan 42 is less than or equal to the rated current of the second fan 42, the controller increases the speed of the second fan 42 and decreases the speed of the first fan 3. The controller then again determines whether the actual air volume of the outdoor unit 20 exceeds the rated air volume, and determines whether the current of the first fan 3 exceeds the rated current of the first fan 3 and whether the current of the second fan 42 exceeds the rated current of the second fan 42. The actual air volume reaching the rated air volume means that the actual air volume is equal to the rated air volume.

[0223] At this point, the current of the first fan 3 exceeds its rated current. If the first fan 3 continues to operate, it will be damaged. The controller increases the speed of the second fan 42 to increase the air output. The second fan 42 can also share the resistance of the first fan 3, thereby reducing the current of the first fan 3 and fully utilizing the capabilities of the first and second fans 3 and 42.

[0224] When it is detected that the actual air output volume has reached the rated air output volume, and when it is detected that the current of the second fan 42 exceeds the rated current of the second fan 42 and the current of the first fan 3 is less than or equal to the rated current of the first fan 3, the speed of the first fan 3 is increased and the speed of the second fan 42 is decreased. Thereafter, the difference between the actual air output volume of the outdoor unit 20 and the rated air output volume is determined, and it is determined whether the current of the first fan 3 exceeds the rated current of the first fan 3 and whether the current of the second fan 42 exceeds the rated current of the second fan 42.

[0225] At this point, the current of second fan 42 exceeds its rated current. If second fan 42 continues to operate, it will be damaged. The controller increases the speed of first fan 3, increasing the airflow. First fan 3 also shares the resistance of second fan 42, thereby reducing the current of second fan 42. Thus, in the same scenario, the current of second fan 42 decreases, and the speed of second fan 42 also decreases, allowing the full utilization of the capabilities of first fan 3 and second fan 42.

[0226] When it is detected that the actual air output volume has reached the rated air output volume, and when it is detected that the current of the second fan 42 exceeds the rated current of the second fan 42 and the current of the first fan 3 exceeds the rated current of the first fan 3, the first fan 3 and the second fan 42 are controlled to reduce their speeds to the same level. Thereafter, the actual air output volume of the outdoor unit 20 is again compared to the rated air output volume, and it is determined whether the current of the first fan 3 exceeds the rated current of the first fan 3 and whether the current of the second fan 42 exceeds the rated current of the second fan 42.

[0227] At this time, the currents of the first fan 3 and the second fan 42 may be reduced to reduce the rotational speeds of the first fan 3 and the second fan 42 to avoid damaging the first fan 3 and the second fan 42 .

[0228] In some embodiments, when the first fan 3 reaches the first preset speed and the second fan 42 reaches the second preset speed, the controller determines the difference between the actual air output of the outdoor unit and the rated air output, and determines whether the current of the first fan 3 exceeds the rated current of the first fan 3 and whether the current of the second fan 42 exceeds the rated current of the second fan 42.

[0229] If the actual air volume is greater than the rated air volume, and if the current of the first fan 3 is less than or equal to the rated current of the first fan 3 and the current of the second fan 42 exceeds the rated current of the second fan 42, the controller controls the reduction of the speed of the second fan 42. Thereafter, the controller again determines whether the actual air volume of the outdoor unit 20 is greater than the rated air volume, and determines whether the current of the first fan 3 exceeds the rated current of the first fan 3 and whether the current of the second fan 42 exceeds the rated current of the second fan 42.

[0230] At this time, the actual air output is greater than the rated air output. By reducing the rotation speed of the second fan 42, damage to the second fan 42 can be avoided and the air output can be reduced.

[0231] If the actual air volume is detected to be less than the rated air volume, and if the current of the first fan 3 is detected to be less than or equal to the rated current of the first fan 3 and the current of the second fan 42 exceeds the rated current of the second fan 42, the controller increases the speed of the first fan 3. The controller then again determines whether the actual air volume of the outdoor unit 20 is greater than the rated air volume, and whether the current of the first fan 3 exceeds the rated current of the first fan 3 and whether the current of the second fan 42 exceeds the rated current of the second fan 42.

[0232] At this point, the current of second fan 42 exceeds its rated current. Continuing to operate second fan 42 would damage it. The controller increases the speed of first fan 3, increasing the airflow. First fan 3 also shares the fan resistance of second fan 42, thereby reducing the current of second fan 42. Thus, in the same scenario, the current of second fan 42 decreases, and its speed also decreases, allowing the full utilization of the capabilities of first fan 3 and second fan 42.

[0233] If the actual air volume is detected to be greater than the rated air volume, and if it is detected that the current of the first fan 3 exceeds the rated current of the first fan 3 and the current of the second fan 42 is less than or equal to the rated current of the second fan 42, the rotation speed of the first fan 3 is controlled to be reduced. Then, the actual air volume of the outdoor unit 20 is compared with the rated air volume, and it is determined whether the current of the first fan 3 exceeds the rated current of the first fan 3 and whether the current of the second fan 42 exceeds the rated current of the second fan 42.

[0234] At this time, the actual air output is greater than the rated air output. By reducing the rotation speed of the first fan 3, damage to the first fan 3 can be avoided, and the air output can also be reduced.

[0235] If the actual air volume is detected to be less than the rated air volume, and if the current of the first fan 3 exceeds the rated current of the first fan 3 and the current of the second fan 42 is less than or equal to the rated current of the second fan 42, the controller increases the speed of the second fan 42. The controller then again determines whether the actual air volume of the outdoor unit 20 is greater than the rated air volume, and whether the current of the first fan 3 exceeds the rated current of the first fan 3 and the current of the second fan 42 exceeds the rated current of the second fan 42.

[0236] At this time, the actual air output is less than the rated air output. By controlling and increasing the speed of the second fan 42, the air output can be increased, and the second fan 42 shares the fan resistance of the first fan 3, thereby reducing the current of the first fan 3, so as to give full play to the capabilities of the first fan 3 and the second fan 42, so that the first fan 3 adopts a low-power and low-cost fan, which can make the low-power and low-cost first fan 3 play a greater role, reduce costs, and make the outdoor unit 20 more resistant to static pressure to cope with ultra-high static pressure conditions.

[0237] When it is detected that the actual air output volume is greater than the rated air output volume, and when it is detected that the current of the first fan 3 exceeds the rated current of the first fan 3 and the current of the second fan 42 exceeds the rated current of the second fan 42, the controller controls to reduce the rotational speeds of the first fan 3 and the second fan 42. Then, the actual air output volume of the outdoor unit 20 is compared with the rated air output volume again, and it is determined whether the current of the first fan 3 exceeds the rated current of the first fan 3 and whether the current of the second fan 42 exceeds the rated current of the second fan 42.

[0238] At this time, the actual air output is greater than the rated air output. By reducing the rotational speeds of the first fan 3 and the second fan 42, damage to the first fan 3 and the second fan 42 can be avoided while reducing the air output.

[0239] In some embodiments, when the first fan 3 reaches the first preset speed and the second fan 42 reaches the second preset speed, the controller determines the difference between the actual air output of the outdoor unit 20 and the rated air output, and determines whether the power of the first fan 3 exceeds the rated power of the first fan 3 and whether the power of the second fan 42 exceeds the rated power of the second fan 42.

[0240] When it is detected that the power of the first fan is less than or equal to the rated power of the first fan and the power of the second fan 42 is less than or equal to the rated power of the second fan 42, when the actual air volume is lower than the rated air volume, the rotation speeds of the first fan 3 and the second fan 42 are controlled to increase by the same number of revolutions, and then the actual air volume and the rated air volume of the outdoor unit 20 are judged again, and it is judged whether the power of the first fan 3 exceeds the rated power of the first fan 3 and whether the power of the second fan 42 exceeds the rated power of the second fan 42.

[0241] At this time, the power of the first fan 3 and the second fan 42 can be increased to increase the rotation speed of the first fan 3 and the second fan 42, thereby increasing the air output of the outdoor unit 20.

[0242] The speed of the second fan 42 is higher than that of the first fan 3, which can increase the air output, and the second fan 42 can share the fan resistance of the first fan 3, thereby reducing the power of the first fan 3, so as to give full play to the capabilities of the first fan 3 and the second fan 42, and enable the first fan 3 to adopt a low-power and low-cost fan, so that the low-power and low-cost first fan 3 can play a greater role, reduce the cost of the outdoor unit 20, and make the outdoor unit 20 more resistant to static pressure to cope with ultra-high static pressure conditions.

[0243] By controlling the first fan 3 and the second fan 42 to run at different speeds, and using a low-power and low-cost fan for the first fan 3, it is easy to adjust the power of the first fan 3 and the second fan 42 or keep the power consistent, thereby improving the power stability of the outdoor unit 20 and increasing the service life of the outdoor unit 20.

[0244] When it is detected that the power of the first fan 3 is less than or equal to the rated power of the first fan 3 and the power of the second fan 42 is less than or equal to the rated power of the second fan 42, when the actual air volume is higher than the rated air volume, the rotation speeds of the first fan 3 and the second fan 42 are controlled to be reduced by the same number of revolutions, and then the actual air volume and the rated air volume of the outdoor unit 20 are judged again, and it is judged whether the power of the first fan 3 exceeds the rated power of the first fan 3 and whether the power of the second fan 42 exceeds the rated power of the second fan 42.

[0245] At this time, the power of the first fan 3 and the second fan 42 can be reduced to reduce the rotation speed of the first fan 3 and the second fan 42, thereby reducing the air output of the outdoor unit 20.

[0246] In some embodiments, the initial speed difference can be an empirical value. For example, the speed of the second fan 42 can be set to be 100 rpm greater than the speed of the first fan 3, effectively improving the unit's ability to withstand static pressure. If the initial speed difference is too small, the speed difference between the first fan 3 and the second fan 42 is too small, resulting in a weak suction effect of the second fan 42 on the first fan 3 and insignificantly improving the performance of the outdoor unit 20. Therefore, the initial speed difference can be set to be greater than 50 rpm, greater than 100 rpm, or greater than 150 rpm.

[0247] In some embodiments, if the initial speed difference is too large, the current of the second fan 42 will be too large. Therefore, the initial speed should not be too large. The initial speed difference can be set to less than 150 rpm, or the initial speed difference is less than 100 rpm, or the initial speed difference is less than 50 rpm.

[0248] In some embodiments of the present disclosure, setting an initial speed difference can better exert the anti-static pressure capability of the outdoor unit 20, balance the current or power of the first fan 3 and the second fan 42, reasonably optimize the operating conditions of the outdoor unit 20, and extend the service life of the outdoor unit 20. In this way, the capacity of the fan can be fully utilized, and a low-power and low-cost fan can be used to achieve greater effects, thereby reducing costs and improving the competitiveness of the air conditioner 1000.

[0249] In some embodiments, as shown in Figure 20, the outdoor unit 20 includes at least two second fans. For example, the at least two second fans include a first sub-fan 101. The first sub-fan 101 is provided with a first position point 1011 and a third position point 1012.

[0250] The at least one second fan further includes a second sub-fan 102 . A second position point 1021 is provided on the second sub-fan 102 . The first position point 1011 and the second position point 1021 are arranged along the width direction of the first housing 1 .

[0251] In some embodiments, the first location point 1011 and the second location point 1021 are located on the same horizontal plane.

[0252] In some embodiments, the first sub-fan 101 and the second sub-fan 102 are symmetrically arranged in the width direction of the second housing 41 .

[0253] In some embodiments, when the outdoor unit 20 includes at least two first fans, at least one first fan includes: a third sub-fan 103, the rotation center of the third sub-fan 103 corresponds to the rotation center of the first sub-fan 101, and a fourth position point 1031 is set on the third sub-fan 103.

[0254] The at least one first fan further includes a fourth sub-fan 104 , and a rotation center of the fourth sub-fan 104 corresponds to a rotation center of the second sub-fan 102 .

[0255] If the outdoor unit 20 includes at least two first fans and at least two second fans, an unreasonable layout of the first fans and the second fans may lead to poor air volume and noise performance of the outdoor unit 20 under high static pressure conditions.

[0256] Since at least four fans adopt a structure that combines parallel and series connections, the air volume and noise under high static pressure conditions are affected by many factors, such as the layout position of the fans, the overall size of the unit, the layout of internal components, the direction of airflow in the internal space of the unit, etc., and the performance of different outdoor units 20 is different. Therefore, it is necessary to determine the up, down, left and right layout positions of the four fans according to the actual situation of the outdoor unit 20 so that the air volume and noise performance of the outdoor unit 20 can reach excellent conditions.

[0257] In some embodiments, the size of the outdoor unit 20, the internal layout of the components, the size of the first fan and the second fan, the position of the first fan and the second fan in the outdoor unit 20, the speed of the first fan and the second fan, and other information are first confirmed.

[0258] In some embodiments, the first fan is disposed below the second fan, and the position of the second fan is easily adjustable. Therefore, the installation position of the first fan in the height direction of the first housing 1 is first determined, so that the position of the second fan can be determined based on the position of the first fan.

[0259] In some embodiments, as shown in FIG. 20 and FIG. 22 , within the second housing 41 , the distance between the first position point 1011 and the second position point 1021 is defined as distance a, and the maximum value of distance a that can be set is distance A.

[0260] That is, in the width direction of the second shell 41, the maximum distance between the first position point 1011 and the second position point 1021 can be set to distance A, and the first sub-fan 101 and the second sub-fan 102 are moved away from each other in the width direction of the second shell 41. When the first sub-fan 101 and the second sub-fan 102 move to abut the second shell 41, at this time, the distance between the first position point 1011 and the second position point 1021 is distance A.

[0261] In some embodiments, as shown in FIG. 20 and FIG. 21 , the distance between the third position point 1012 and the fourth position point 1031 in the height direction of the first housing 1 is defined as a distance b, and the maximum value of the distance b is a distance B.

[0262] In some embodiments, the installation position of the third sub-fan 103 in the height direction of the first shell 1 is determined, and the first sub-fan 101 is moved away from the third sub-fan 103 in the height direction of the second shell 41. When the first sub-fan 101 moves to abut the second shell 41, at this time, the distance between the third position point 1012 and the fourth position point 1031 in the height direction of the first shell 1 is defined as distance A.

[0263] In some embodiments, a value in distance B is defined as the initial distance, and distance A is divided into n segments, with a point selected from each segment of distance A. The midpoint of distance B can be used as the initial distance. For example, as shown in FIG22 , n is 5 segments.

[0264] Under the preset static pressure outside the machine, the distance a is taken as the distance between a point taken on each segment in the n segments and the first position point 1011. The first fan and the second fan are turned on to run at the set speed, and the air volume of the second air outlet 412 is detected in turn to obtain the distance a corresponding to the maximum air volume.

[0265] Divide the distance B into q segments and select a point in each segment of distance B. The point can be the midpoint of each segment or a point at another position.

[0266] Under the preset static pressure outside the machine, the distance b is taken as the distance between a point taken on each segment in the q segment and the fourth position point 1031. The first fan and the second fan are turned on to run at the set speed, and the air volume of the second air outlet 412 is detected in turn to obtain the distance b corresponding to the maximum air volume.

[0267] The distances between the first sub-fan 101, the third sub-fan 103, the second sub-fan 102 and the fourth sub-fan 104 are set according to the distance a corresponding to the maximum air volume and the distance b corresponding to the maximum air volume, thereby determining the positions of the first sub-fan 101, the third sub-fan 103, the second sub-fan 102 and the fourth sub-fan 104 in the height direction of the first shell 1 and the positions in the width direction of the first shell 1.

[0268] In some embodiments, a value in distance B is defined as the initial distance, and distance A is divided into n segments, with a point selected from each segment of distance A. The midpoint of distance B can be used as the initial distance. As shown in FIG22 , n can be set to 5 segments.

[0269] Under a preset static pressure, distance b is defined as the initial distance, which remains unchanged. Distance a takes n values ​​of A·(m / n) in sequence. The first and second fans are turned on at the set speeds, and the airflow from the second air outlet 412 is sequentially measured. The value of distance a corresponding to the maximum airflow is defined as a fourth distance A1, where m and n are constants, and n>m.

[0270] Divide the distance B into q segments and select a point in each segment of distance B. The point can be the midpoint of each segment or a point at another position.

[0271] Under the preset static pressure, the distance a is defined as the fourth distance A1 and remains unchanged, the distance b takes q values ​​in turn as B·(v / q), the first fan and the second fan are turned on to run at the set speed, the air volume of the second air outlet 412 is detected in turn, and the value of the distance b corresponding to the maximum air volume is defined as the fifth distance B1, v and q are constants, and q>v.

[0272] The distances between the first sub-fan 101 , the third sub-fan 103 , the second sub-fan 102 and the fourth sub-fan 104 are set according to the distance a corresponding to the maximum air volume and the distance b corresponding to the maximum air volume.

[0273] By determining the height and width positions of the first, third, second, and fourth sub-fans 101, 103, 102, and 104 of the first housing 1 under different preset external static pressures, a more rational layout is achieved. This avoids the problem of airflow turbulence and mutual interference between the fans caused by placing the first and second fans too close together, thereby preventing the problem of reduced air volume and increased noise, which affects the comfort and reliability of the unit. Furthermore, this avoids the problem of the first and second fans being placed too far apart, which would cause the fans to lose their mutual support, thus reducing air volume and affecting unit performance.

[0274] Some embodiments of the present disclosure also provide a method for controlling the air conditioner 1000 .

[0275] In some embodiments, as shown in FIG. 23 , after obtaining the fourth distance A1 and the fifth distance B1 , the controller is further configured to execute steps 110 to 113 .

[0276] In step 110, under a preset external static pressure, the distance b is defined as the distance b corresponding to the maximum air volume, and the distance b remains unchanged. The upper and lower spacings between the first sub-fan 101 and the third sub-fan 103 are set according to the distance b corresponding to the maximum air volume.

[0277] In step 111, one of the sections corresponding to the distance a at the maximum air volume is divided into p sections, and a point is taken on each section in the p sections, where p is a positive integer; under the preset external static pressure, the distance a is taken as the distance between a point taken on each section in the p sections and the first position point 1011, the first fan and the second fan are turned on to run at the set speed, the air volume of the second air outlet 412 is detected in turn, and the distance a corresponding to the maximum air volume is obtained.

[0278] The position of the point on each segment in the p segments can be the midpoint of each segment, and the length of each segment in the p segments can be set to be equal to facilitate calculation.

[0279] In some embodiments of the present disclosure, by recalculating the distance a corresponding to the maximum air volume, the calculation result of the distance a corresponding to the maximum air volume is made more accurate, which can improve the performance of the unit.

[0280] In step 112, under a preset external static pressure, the distance a is defined as the distance a corresponding to the maximum air volume, and the left-right spacing between the first sub-fan 101 and the second sub-fan 102 is set according to the distance a corresponding to the maximum air volume.

[0281] In step 113, the segment corresponding to the distance b at the maximum air volume is divided into w segments. A point is selected from each of the w segments, where w is a positive integer. Under a preset external static pressure, the distance b is sequentially taken as the distance between the point selected from each of the w segments and the fourth position 1031. The first and second fans are then started at the set speeds, and the air volume from the second air outlet 412 is sequentially measured to obtain the distance b corresponding to the maximum air volume. The point selected from each of the w segments can be the midpoint of each segment to facilitate calculation.

[0282] In some embodiments, the length of each segment in the w segments can be set to be equal to facilitate calculation.

[0283] By recalculating the distance b corresponding to the maximum air volume, the calculation result of the distance a corresponding to the maximum air volume is made more accurate through multiple calculations, which can improve the performance of the unit after the fan is installed.

[0284] In some embodiments, after looping through steps 110 to 113 for a predetermined number of times, the distance a corresponding to the maximum air volume and the distance b corresponding to the maximum air volume are obtained. The predetermined number of times is greater than or equal to two to improve the accuracy of the calculation results.

[0285] In some embodiments, after looping through steps 110 and 111 for a predetermined number of times, the distance a corresponding to the maximum air volume is obtained. The accuracy of the distance a corresponding to the maximum air volume is improved by performing multiple calculations.

[0286] In some embodiments, after looping step 112 and step 113 for a preset number of times, the distance b corresponding to the maximum air volume is obtained, and the calculation accuracy of the distance b corresponding to the maximum air volume is improved through multiple calculations.

[0287] In some embodiments, after obtaining the distance a corresponding to the maximum air volume and the distance b corresponding to the maximum air volume, the first fan and the second fan are started and run. When the first fan and the second fan reach the set speed, the noise value is detected. When the noise value meets the set requirements, the distance a and the distance b at this time are obtained.

[0288] At this time, the noise value meets the set requirements, and the positions of the first sub-fan 101, the third sub-fan 103, the second sub-fan 102 and the fourth sub-fan 104 in the height direction of the first shell 1 and the width direction of the first shell 1 are set according to the obtained distance a and distance b, which can meet the demand for large air output.

[0289] In some embodiments, as shown in FIG. 24 , the controller is further configured to perform steps 210 to 212 .

[0290] In step 210, the noise value is detected. When the noise value does not meet the set requirements, under the preset static pressure, the distance a is defined as the distance a corresponding to the maximum air volume. The distance a remains unchanged, and the left and right spacing between the first sub-fan 101 and the second sub-fan 102 is set according to the distance a corresponding to the maximum air volume.

[0291] In step 211, a section corresponding to the distance b at the maximum air volume is divided into f sections, and a point is taken from each section of the f sections, where f is a positive integer. Under a preset static pressure, the distance b is sequentially taken as the distance between a point taken from each section of the f sections and the fourth position point 1031. The first fan and the second fan are turned on and run at a set speed, and the noise value is detected in turn. When the noise value meets the set requirements, the corresponding distance b is obtained.

[0292] The distance b at this point is the distance b at which the noise level is optimized and the air volume is maximized. Positioning the first sub-fan 101, the third sub-fan 103, the second sub-fan 102, and the fourth sub-fan 104 in the height direction of the first housing 1 according to the obtained distance b can meet the requirements of high air volume and optimal noise.

[0293] In some embodiments, when it is detected that the noise value does not meet the set requirements, the distance b corresponding to the noise that meets the first selection condition in a section corresponding to the distance b at the maximum air output is obtained, and under the preset external static pressure, the distance b is set to the distance b corresponding to the noise that meets the first selection condition, and the upper and lower spacing between the first sub-fan 101 and the third sub-fan 103 is set according to the distance b corresponding to the noise that meets the first selection condition.

[0294] In step 212, a section corresponding to the distance a at the maximum air volume is divided into e sections, and a point is taken on each section in the e section, where e is a positive integer; under the preset external static pressure, the distance a is taken as the distance between a point taken on each section in the e section and the first position point 1011, the first fan and the second fan are turned on to run at the set speed, and the noise value is detected in turn. When the noise value meets the set requirements, the corresponding distance a is obtained.

[0295] The distance a at this time is the distance a when the noise level is optimal and the air volume is maximum. The positions of the first sub-fan 101, the third sub-fan 103, the second sub-fan 102, and the fourth sub-fan 104 in the width direction of the first housing 1 are arranged according to the obtained distance a to meet the requirements of large air volume and optimal noise.

[0296] In some embodiments, when it is detected that the noise value does not meet the set requirement, the distance range corresponding to the distance b at the maximum air volume is increased, and then step S21 is executed.

[0297] In some embodiments, when it is detected that the noise value does not meet the set requirement, the distance range corresponding to the distance a at the maximum air volume is increased, and step S22 is executed again.

[0298] When the noise judgment criteria cannot be met within the interval segment where the optimal air volume distance a and distance b are located, the interval range of the optimal air volume distance a and distance b is expanded, and the above process is repeated until the optimal a and b values ​​that meet the noise conditions and have the maximum air volume are selected, and the process ends.

[0299] In some embodiments, the noise level requirements can be set as follows: the average noise level of the first sub-fan 101, the third sub-fan 103, the second sub-fan 102, and the fourth sub-fan 104 must be within 3 dB of the average noise level of the fans in a conventional dual-fan unit. The average noise level of the outdoor unit 20 must be within 2 dB of the average noise level of the entire conventional dual-fan unit. The noise amplitude of the fan in the outdoor unit 20 must be less than or equal to 60 dB. No abnormal sound with obvious periodic changes can be heard.

[0300] In some embodiments, the first selection condition may be that at least three of four set requirements for the noise value are satisfied.

[0301] In some embodiments, the first selection condition may be that at least two of four set requirements for the noise value are satisfied.

[0302] In some embodiments, in the method for obtaining the distance b corresponding to the maximum air volume, the distance B can be divided into five areas of equal length, and the middle value of each area is taken as the measuring point. The positions of the third sub-fan 103 and the fourth sub-fan 104 remain unchanged, and the positions of the first sub-fan 101 and the second sub-fan 102 are adjusted. Taking the first sub-fan 101 as an example, the third position point 1012 on the first sub-fan 101 is adjusted to 1B / 10, 3B / 10, 5B / 10, 7B / 10, and 9B / 10 distances as measuring points, and the distance b between the third position point 1012 and the fourth position point 1031 is used to test the air volume of the unit under the preset external static pressure. The area where the measuring point with the optimal air volume among the above five measuring points is located is the optimal air volume area. The optimal air volume area is further divided and tested according to the above principles, and the measuring point and the optimal air volume area can be further subdivided to determine the optimal air volume. The specific number of test rounds can be determined according to the actual situation. The more test rounds, the greater the workload, but the better the values ​​of a and b, and more than or equal to 2 test rounds can be set.

[0303] In some embodiments, as shown in FIG. 25 , the controller is further configured to execute steps 311 to 325 .

[0304] In step 311 , the environment surrounding the outdoor unit changes, thereby affecting the change of the static pressure outside the outdoor unit.

[0305] In step 312 , it is determined that the static pressure is reduced, and steps 313 and 316 are executed.

[0306] In step 313, when the static pressure outside the unit is less than 50 Pa, the second fan will be turned off and only the first fan will be operated.

[0307] In step 314 , it is determined that the static pressure has increased, and steps 315 and 316 are executed.

[0308] In step 315, the motor current or power is monitored. When the speed of one of the first and second fans reaches the upper limit, the motor speed cannot be increased again and the air volume of the entire fan reaches the upper limit.

[0309] In step 316, it is determined whether the actual air volume meets the rated air volume. If yes, the process ends; if no, steps 317, 318, and 319 are executed respectively according to the difference between the actual air volume and the rated air volume.

[0310] In step 317 , it is determined that the actual air volume is within 10% of the rated air volume, and step 320 is executed.

[0311] In step 318 , it is determined that the actual air volume differs from the rated air volume by 10% to 20%, and step 321 is executed.

[0312] In step 319 , it is determined that the actual air volume differs from the rated air volume by more than 20%, and step 322 is executed.

[0313] In step 320 , the speeds of the upper and lower fans are controlled to be synchronously increased or decreased by 20 revolutions, and step 323 is executed.

[0314] In step 321 , the speeds of the upper and lower fans are controlled to be synchronously increased or decreased by 50 revolutions, and step 323 is executed.

[0315] In step 322 , the speeds of the upper and lower fans are controlled to be synchronously increased or decreased by 100 revolutions, and step 323 is executed.

[0316] In step 323, it is determined whether the actual air volume is less than the rated air volume. If "yes", step 324 is executed; if "no", the process ends.

[0317] In step 324 , it is determined whether the motor current meets the requirement. If yes, the process returns to step 316 ; if no, the process proceeds to step 325 .

[0318] In step 325 , the rotation speed is increased according to the current limit so as to meet the current requirement, and then the process ends.

[0319] In some embodiments, as shown in FIG. 26 , the controller is further configured to perform step 411 and step 412 .

[0320] In step 411, the static pressure data outside the outdoor unit is obtained, and the rated air volume of the outdoor unit is confirmed.

[0321] In step 412, when the static pressure outside the outdoor unit is less than 50Pa, the fan assembly is not installed or only the first fan is running and the second fan is not running; when the static pressure outside the outdoor unit is greater than or equal to 50Pa, the first fan and the second fan are turned on and off at the same speed.

[0322] In this way, the system stability is higher, the mutual influence between fan systems is smaller, and the static pressure resistance of the outdoor unit can be stably improved, and the air volume and capacity of the outdoor unit under high static pressure can be improved.

[0323] In some embodiments, as shown in FIG. 27 , the controller is further configured to execute steps 511 to 527 .

[0324] In step 511, the external static pressure, the upper limit of the motor current or power, and the rated air volume of the unit are confirmed.

[0325] In step 512 , the first fan and the second fan are controlled to set an initial rated speed difference.

[0326] In step 513, the first fan and the second fan are controlled to start, the rated speed difference is kept constant, and the first fan and the second fan are made to reach a preset speed.

[0327] In step 514, it is determined whether the actual air output of the outdoor unit reaches the rated air output. If yes, step 526 is executed; if no, steps 516, 517, and 518 are executed respectively according to the current exceeding limit of the first fan and the second fan.

[0328] In step 515 , it is determined that the current of the second wind turbine exceeds the limit, and step 518 is executed.

[0329] In step 516 , it is determined that the current of the first wind turbine exceeds the limit, and step 519 is executed.

[0330] In step 517 , it is determined that the currents of the first fan and the second fan are both exceeded, and step 520 is executed.

[0331] In step 518 , the speed of the first fan is increased, and step 526 is executed.

[0332] In step 519 , the speed of the second fan is increased, and step 526 is executed.

[0333] In step 520 , the rotational speeds of the first fan and the second fan are reduced respectively, and step 526 is executed.

[0334] In step 521, it is determined whether the actual air output of the outdoor unit reaches the rated air output. If "yes", step 526 is executed; if "no", step 527 is executed and then step 522 and step 523 are executed respectively.

[0335] In step 522 , it is determined that the actual air volume does not meet the rated air volume, and step 524 is executed.

[0336] In step 523 , it is determined that the actual air volume exceeds the rated air volume, and step 525 is executed.

[0337] In step 524, the rotational speeds of the first fan and the second fan are reduced, and the difference between the initial rated rotational speeds of the first fan and the second fan is kept unchanged.

[0338] In step 525, the rotational speeds of the first fan and the second fan are increased, and the difference between the rated rotational speeds of the first fan and the second fan is kept unchanged.

[0339] In step 526, it is determined whether the two criteria of actual air volume and current (power) are both yes. If yes, the process ends; if no, step 527 is executed.

[0340] In step 527, the judgment is made again after correction.

[0341] In some embodiments, as shown in FIG. 28 , the controller is further configured to execute steps 611 to 615 .

[0342] In step 611, the outdoor unit size, internal component layout, fan size, fan position in the unit, and fan speed are confirmed.

[0343] In step 612, the maximum left-right spacing between outdoor fans is determined to be A, and the maximum top-bottom spacing is determined to be B; the actual left-right spacing between fans is set to a, and the actual top-bottom spacing is set to b.

[0344] In step 613, the value a of the outdoor unit when the air volume is optimal under the preset external static pressure condition is tested.

[0345] In step 614, after the optimal a value is confirmed, the optimal b value is confirmed again, with b as a variable and a as a constant, and the optimal b value is confirmed according to the test process.

[0346] In step 615, multiple rounds of testing are performed to ultimately determine the optimal a and b values.

[0347] In some embodiments, as shown in FIG. 29 , the controller is further configured to execute steps 711 to 719 .

[0348] In step 711, the vertical and horizontal spacings of the four fans in the outdoor unit are adjusted to the preset a and b values.

[0349] In step 712, the outdoor unit is controlled to operate, the four fans reach the set speed, and the noise level is tested.

[0350] In step 713, it is determined whether the noise level meets the noise setting requirement. If yes, step 719 is executed; if no, steps 714 to 719 are executed.

[0351] In step 714, the value a is kept unchanged and the value b is adjusted from small to large within the optimal air volume b value range.

[0352] It should be noted that after executing step 714 , the process may return to executing step 713 to repeat the process for a preset number of times.

[0353] In step 715, if the noise setting requirement cannot be met within the optimal air volume b value range, the optimal noise b value within the optimal air volume range is selected, the b value is kept unchanged, the a value is adjusted, and the noise test is performed.

[0354] In step 716, the noise value is determined according to the noise setting requirements. If "yes", step 719 is executed; if "no", step 717 is executed.

[0355] In step 717, the b value is kept unchanged and the a value is adjusted from small to large within the optimal air volume a value range.

[0356] It should be noted that after executing step 717 , the process may return to execute step 716 to repeat the process for a preset number of times.

[0357] In step 718, when the noise setting requirement cannot be met within the optimal air volume a and b value range, the optimal air volume a and b value range is expanded and the above process is repeated.

[0358] In step 719, the optimal a and b values ​​that meet the noise setting requirements and have the maximum air volume are selected.

[0359] Those skilled in the art will understand that the scope of the present invention 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 application. The scope of the present application is limited by the appended claims.

Claims

1. An air conditioner, comprising: Indoor unit; an outdoor unit connected to the indoor unit, and comprising: a first housing including a first cavity; a first air inlet, provided on the first shell; a first air outlet, provided on the first shell, wherein the first air inlet and the first air outlet are respectively connected to the first cavity; an outdoor heat exchanger, disposed in the first chamber; a first fan disposed in the first cavity, the first fan being configured to drive outdoor air through the first air inlet, then through the outdoor heat exchanger, and out through the first air outlet; and A fan assembly is disposed on the top of the first housing and is detachably connected to the first housing. The fan assembly includes: a second shell, disposed on top of the first shell, the second shell comprising a second cavity; a second air inlet, disposed on the second housing and opposite to the first air outlet; a second air outlet, provided on the second shell, wherein the second air inlet and the second air outlet are respectively communicated with the second cavity; and a second fan disposed inside the second housing, the second fan being capable of driving the air in the first cavity into the second cavity through the second air inlet, and then being discharged to the outside through the second air outlet; and The controller is configured as: Controlling the first fan to be turned on so that the first fan reaches a first preset speed, and controlling the second fan to be turned on so that the second fan reaches a second preset speed; the second preset speed is greater than the first preset speed; If it is determined that the current of the first fan is less than or equal to the rated current of the first fan, and the current of the second fan is less than or equal to the rated current of the second fan; When the actual air output of the outdoor unit is less than the rated air output, the rotation speeds of the first fan and the second fan are controlled to increase by the same number of revolutions; When the actual air output is greater than the rated air output, the rotational speeds of the first fan and the second fan are controlled to be reduced by the same number of revolutions.

2. An air conditioner comprising: Indoor unit; an outdoor unit connected to the indoor unit, and comprising: a first housing including a first cavity; a first air inlet, provided on the first shell; a first air outlet, provided on the first housing, wherein the first air inlet and the first air outlet are respectively connected to the first cavity; an outdoor heat exchanger, disposed in the first chamber; a first fan disposed in the first cavity, the first fan being configured to drive outdoor air through the first air inlet, then through the outdoor heat exchanger, and out through the first air outlet; and A fan assembly is disposed on the top of the first housing and is detachably connected to the first housing. The fan assembly includes: a second shell, disposed on top of the first shell, the second shell comprising a second cavity; a second air inlet, disposed on the second housing and opposite to the first air outlet; a second air outlet, provided on the second shell, wherein the second air inlet and the second air outlet are respectively communicated with the second cavity; and a second fan disposed inside the second housing, the second fan being capable of driving the air in the first cavity into the second cavity through the second air inlet, and then being discharged to the outside through the second air outlet; and The controller is configured as: Controlling the first fan to be turned on so that the first fan reaches a first preset speed, and controlling the second fan to be turned on so that the second fan reaches a second preset speed; the second preset speed is greater than the first preset speed; If it is determined that the actual air output of the outdoor unit is equal to the rated air output; When the current of the first fan is greater than the rated current of the first fan and the current of the second fan is less than or equal to the rated current of the second fan, the speed of the second fan is controlled to increase and the speed of the first fan is controlled to decrease.

3. The air conditioner according to claim 2, wherein: If it is determined that the actual air volume is equal to the rated air volume; When the current of the second fan is greater than the rated current of the second fan and the current of the first fan is less than or equal to the rated current of the first fan, the rotation speed of the first fan is controlled to increase and the rotation speed of the second fan is controlled to decrease.

4. The air conditioner according to claim 2, wherein: If it is determined that the actual air volume is equal to the rated air volume; When the current of the second fan is greater than the rated current of the second fan and the current of the first fan is greater than the rated current of the first fan, the first fan and the second fan are controlled to reduce the same rotational speed.

5. An air conditioner comprising: Indoor unit; an outdoor unit connected to the indoor unit, and comprising: a first housing including a first cavity; a first air inlet, provided on the first shell; a first air outlet, provided on the first housing, wherein the first air inlet and the first air outlet are respectively connected to the first cavity; an outdoor heat exchanger, disposed in the first chamber; a first fan disposed in the first cavity, the first fan being configured to drive outdoor air through the first air inlet, then through the outdoor heat exchanger, and out through the first air outlet; and A fan assembly is disposed on the top of the first housing and is detachably connected to the first housing. The fan assembly includes: a second shell, disposed on top of the first shell, the second shell comprising a second cavity; a second air inlet, disposed on the second housing and opposite to the first air outlet; a second air outlet, provided on the second shell, wherein the second air inlet and the second air outlet are respectively communicated with the second cavity; and a second fan disposed inside the second housing, the second fan being capable of driving the air in the first cavity into the second cavity through the second air inlet, and then being discharged to the outside through the second air outlet; and The controller is configured as: Controlling the first fan to be turned on so that the first fan reaches a first preset speed, and controlling the second fan to be turned on so that the second fan reaches a second preset speed; the second preset speed is greater than the first preset speed; If it is determined that the actual air output of the outdoor unit is greater than the rated air output; When the current of the first fan is less than or equal to the rated current of the first fan and the current of the second fan is greater than the rated current of the second fan, the rotation speed of the second fan is controlled to be reduced.

6. The air conditioner according to claim 5, wherein If it is determined that the actual air volume is less than the rated air volume; When the current of the first fan is less than or equal to the rated current of the first fan and the current of the second fan is greater than the rated current of the second fan, the rotation speed of the first fan is controlled to increase.

7. The air conditioner according to claim 5, wherein If it is determined that the actual air volume is greater than the rated air volume; When the current of the first fan is greater than the rated current of the first fan and the current of the second fan is less than or equal to the rated current of the second fan, the rotation speed of the first fan is controlled to be reduced.

8. The air conditioner according to claim 5, wherein If it is determined that the actual air volume is less than the rated air volume; When the current of the first fan is greater than the rated current of the first fan and the current of the second fan is less than or equal to the rated current of the second fan, the rotation speed of the second fan is controlled to increase.

9. The air conditioner according to claim 5, wherein If it is determined that the actual air volume is greater than the rated air volume; When the current of the first fan is greater than the rated current of the first fan and the current of the second fan is greater than the rated current of the second fan, the rotational speeds of the first fan and the second fan are controlled to be reduced.

10. An air conditioner comprising: Indoor unit; an outdoor unit connected to the indoor unit, and comprising: a first housing including a first cavity; a first air inlet, provided on the first shell; a first air outlet, provided on the first housing, wherein the first air inlet and the first air outlet are respectively connected to the first cavity; an outdoor heat exchanger, disposed in the first chamber; a first fan disposed in the first cavity, the first fan being configured to drive outdoor air through the first air inlet, then through the outdoor heat exchanger, and out through the first air outlet; and A fan assembly is disposed on the top of the first housing and is detachably connected to the first housing. The fan assembly includes: a second shell, disposed on top of the first shell, the second shell comprising a second cavity; a second air inlet, disposed on the second housing and opposite to the first air outlet; a second air outlet, provided on the second shell, wherein the second air inlet and the second air outlet are respectively communicated with the second cavity; and a second fan disposed inside the second housing, the second fan being capable of driving the air in the first cavity into the second cavity through the second air inlet, and then being discharged to the outside through the second air outlet; and The controller is configured as: Controlling the first fan to be turned on so that the first fan reaches a first preset speed, and controlling the second fan to be turned on so that the second fan reaches a second preset speed; the second preset speed is greater than the first preset speed; If it is determined that the power of the first fan is less than or equal to the rated power of the first fan, and the power of the second fan is less than or equal to the rated power of the second fan; When the actual air output of the outdoor unit is less than the rated air output, controlling the rotation speeds of the first fan and the second fan to increase by the same number of revolutions; When the actual air output is greater than the rated air output, the rotational speeds of the first fan and the second fan are controlled to decrease by the same number of revolutions.

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