Air conditioner outdoor unit

Abstract

The invention provides an air conditioner outdoor unit. The air conditioner outdoor unit comprises a shell, an outdoor heat exchanger and an outdoor fan and further comprises an outdoor temperature sensor, an indoor temperature sensor, an outdoor coil pipe temperature sensor and a controller, and the controller is configured to calculate an indoor temperature difference value E when the time when the air conditioner outdoor unit receives a first signal is equal to t; the indoor temperature difference value E is the difference value between the indoor environment temperature Tin and the set temperature Ts; the outdoor heat exchange temperature difference delta T is calculated, and the outdoor heat exchange temperature difference T is the difference value between the coil pipe temperature Tc and the outdoor environment temperature Tout; the temperature difference value threshold interval to which the indoor temperature difference value E belongs is judged, and the preset outdoor heat exchange temperature difference corresponding to each temperature difference threshold interval is obtained; if the outdoor heat exchange temperature difference T is smaller than the preset outdoor heat exchange temperature difference, an outdoor fan is driven to reduce the rotating speed; and if the outdoor heat exchange temperature difference T is not smaller than the preset outdoor heat exchange temperature difference, the outdoor fan is driven to increase the rotating speed, so that the rotating speed of the outdoor fan is associated with the indoor actual heat load.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and particularly to an outdoor unit of an air conditioner. Background Art

[0002] With the rapid development of outdoor units of air conditioners, there is a need for the outdoor fans of outdoor units of air conditioners to adjust their rotational speeds according to actual loads.

[0003] An outdoor unit of an air conditioner includes a housing, an outdoor heat exchanger, and an outdoor fan. The housing is provided with an outdoor air inlet and an outdoor air outlet. An outdoor air duct is formed inside the housing. The outdoor heat exchanger is disposed in the outdoor air duct. The outdoor fan rotates to form a low-pressure area in the outdoor air duct, driving air flow to enter the outdoor air duct from the outdoor air inlet, exchange heat with the outdoor heat exchanger, and then flow out from the outdoor air outlet.

[0004] The outdoor unit of the air conditioner includes a controller, and the controller is connected to the outdoor fan.

[0005] In the prior art, in some outdoor units of air conditioners, the controller is configured to: drive the rotational speed of the outdoor fan to change according to the outdoor ambient temperature. The control is relatively single and does not consider the demand of the indoor load for the rotational speed of the outdoor fan. The outdoor fan cannot meet the actual demand of the indoor load.

[0006] In some other outdoor units of air conditioners, the controller is configured to: drive the rotational speed of the outdoor fan to change according to the outdoor ambient temperature and the compressor frequency. Different rotational speeds of the outdoor motor are respectively controlled under different outdoor ambient temperatures and compressor frequencies. However, the actual heat load is not considered, and there are few coupled parameters. The outdoor fan only operates at a fixed rotational speed under specific outdoor ambient temperatures and specific compressor operating frequencies. It can only play a limited role in adjusting the system pressure, cannot adjust the rotational speed of the outdoor fan in real time according to the actual required load, has a low intervention in the system pressure change, cannot adjust in real time according to the system change, and cannot achieve power saving and energy conservation. It only conducts regulation according to the outdoor ambient temperature and the compressor frequency, does not consider the real-time heat load, and cannot make corresponding adjustments according to the actual required heat load. Summary of the Invention

[0007] The present invention solves at least one of the technical problems in the related art to a certain extent.

[0008] Therefore, the present application aims to provide an outdoor unit of an air conditioner.

[0009] The outdoor unit of the air conditioner according to the present application includes: a housing, the housing is provided with an outdoor air inlet and an outdoor air outlet, and an outdoor air duct communicating with the outdoor air inlet and the outdoor air outlet is formed inside the housing;

[0010] an outdoor heat exchanger, which is disposed in the outdoor air duct;

[0011] An outdoor fan, which is connected to an outdoor air duct. The outdoor fan rotates to drive air flow to enter the outdoor air duct from an outdoor air inlet, exchange heat with an outdoor heat exchanger, and then blow out from an outdoor air outlet.

[0012] An outdoor temperature sensor, which is used to measure the outdoor ambient temperature Tout.

[0013] An indoor temperature sensor, which is used to measure the indoor ambient temperature Tin.

[0014] An outdoor coil temperature sensor, which is used to detect the coil temperature Tc of the outdoor heat exchanger.

[0015] A controller, which is connected to the outdoor fan, the outdoor temperature sensor, and the indoor temperature sensor.

[0016] The controller is configured to:

[0017] When the time after the air conditioner outdoor unit receives the first signal is equal to t,

[0018] Calculate the indoor temperature difference value E, where the indoor temperature difference value E is the difference between the indoor ambient temperature Tin and the set temperature Ts.

[0019] Calculate the outdoor heat exchange temperature difference ΔT, where the outdoor heat exchange temperature difference ΔT is the difference between the coil temperature Tc and the outdoor ambient temperature Tout.

[0020] Judge the temperature difference threshold interval to which the indoor temperature difference value E belongs, and obtain the preset outdoor heat exchange temperature difference corresponding to each temperature difference threshold interval.

[0021] If the outdoor heat exchange temperature difference ΔT is less than the preset outdoor heat exchange temperature difference, drive the outdoor fan to reduce the rotation speed.

[0022] If the outdoor heat exchange temperature difference ΔT is not less than the preset outdoor heat exchange temperature difference, drive the outdoor fan to increase the rotation speed.

[0023] In some embodiments of the present application, when E < E1, the preset outdoor heat exchange temperature difference is ΔT1; when E1 ≤ E < E2, the preset outdoor heat exchange temperature difference is ΔT2; when E ≥ E2, the preset outdoor heat exchange temperature difference is ΔT3, and ΔT1 ≤ ΔT2 ≤ ΔT3.

[0024] In some embodiments of the present application, the controller is connected to an indoor fan. The controller is configured to: obtain the rotation speed V of the indoor fan, obtain the actual circulating air volume of the indoor fan according to the first working relationship, calculate the required heat load in the room at this time according to the actual circulating air volume and the indoor temperature difference value E, and calculate the preset values ΔT1, ΔT2, and ΔT3 of the outdoor heat exchange temperature difference at this time according to the law of conservation of energy.

[0025] In some embodiments of the present application, the outdoor fan has five gears, which are the first rotational speed N1, the second rotational speed N2, the third rotational speed N3, the fourth rotational speed N4, and the fifth rotational speed N5 in increasing order; the controller is connected to the indoor fan, and the indoor fan has at least three gears, which are the first gear rotational speed V1, the second gear rotational speed Vm, and the third gear rotational speed Vh in increasing order.

[0026] When the indoor fan rotates at the first gear rotational speed V1, the outdoor fan switches between the first rotational speed N1, the second rotational speed N2, and the third rotational speed N3; when the indoor fan rotates at the second gear rotational speed Vm, the outdoor fan switches between the second rotational speed N2, the third rotational speed N3, and the fourth rotational speed N4; when the indoor fan rotates at the third gear rotational speed Vh, the outdoor fan switches between the third rotational speed N3, the fourth rotational speed N4, and the fifth rotational speed N5.

[0027] The air conditioner outdoor unit according to the present application includes: a housing, an outdoor air inlet and an outdoor air outlet are provided on the housing, and an outdoor air duct communicating with the outdoor air inlet and the outdoor air outlet is formed inside the housing;

[0028] An outdoor heat exchanger, which is disposed in the outdoor air duct;

[0029] An outdoor fan, which is communicated with the outdoor air duct, and the outdoor fan rotates to drive air flow to enter the outdoor air duct from the outdoor air inlet, exchange heat with the outdoor heat exchanger, and then blow out from the outdoor air outlet;

[0030] An outdoor temperature sensor, which is used to measure the outdoor ambient temperature Tout;

[0031] An indoor temperature sensor, which is used to measure the indoor ambient temperature Tin;

[0032] An outdoor coil temperature sensor, which is used to detect the coil temperature Tc of the outdoor heat exchanger;

[0033] A controller, which is connected to the outdoor fan, the outdoor temperature sensor, and the indoor temperature sensor;

[0034] The controller is configured to:

[0035] When the time after the air conditioner outdoor unit receives the first signal is equal to t,

[0036] Calculate the indoor temperature difference value E, and the indoor temperature difference value E is the difference between the indoor ambient temperature Tin and the set temperature Ts;

[0037] Obtain the outdoor ambient temperature Tout;

[0038] Calculate the outdoor heat exchange temperature difference ΔT, and the outdoor heat exchange temperature difference ΔT is the difference between the coil temperature Tc and the outdoor ambient temperature Tout;

[0039] When Tout < Tout1 and E < E1, if the outdoor heat exchange temperature difference ΔT is not less than the preset outdoor heat exchange temperature difference ΔT1, drive the outdoor fan to increase its speed; otherwise, drive the outdoor fan to decrease its speed.

[0040] When Tout ≥ Tout1 or E ≥ E1, if the outdoor heat exchange temperature difference ΔT is not less than the preset outdoor heat exchange temperature difference ΔT2, drive the outdoor fan to increase its speed; otherwise, drive the outdoor fan to decrease its speed; ΔT1 ≤ ΔT2.

[0041] In some embodiments of the present application, when the outdoor fan receives the first signal, start timing at the time when the outdoor unit of the air conditioner receives the first signal, and define a time period with a duration of t as the initial stage of the outdoor unit of the air conditioner.

[0042] The controller is configured to: in the initial stage, obtain the indoor fan speed V, and obtain the corresponding outdoor fan speed range according to the gear in which the indoor fan speed V is located.

[0043] Judge the interval in which the indoor temperature difference value E is located, and combine the second corresponding relationship to obtain the preset speed of the outdoor fan, and drive the outdoor fan to rotate at the preset speed; the larger the temperature value in the interval in which the indoor temperature difference value E is located, the larger the preset speed.

[0044] In some embodiments of the present application, the outdoor fan has m gears, which are the first speed N1, the second speed N2... and the mth speed Nm respectively, m ≥ 2; the indoor fan has at least n gears, which are the first gear speed V1, the second gear speed Vm, the third gear speed Vh... the nth gear speed Vn respectively, n ≥ 2.

[0045] The second corresponding relationship is: the higher the gear in which the speed V of the indoor fan is located, the higher the maximum speed within the corresponding outdoor fan speed range.

[0046] In some embodiments of the present application, the controller is connected to the indoor fan, and the controller is configured to: after the outdoor fan rotates at a fixed speed for t1 time, re-obtain the indoor fan speed V, re-calculate the indoor temperature difference value E, obtain the speed of the outdoor fan according to the latest outdoor heat exchange temperature difference ΔT and the temperature difference value E, and drive the outdoor fan to rotate at this speed.

[0047] In some embodiments of the present application, the outdoor fan has 5 gears, which are the first speed N1, the second speed N2, the third speed N3, the fourth speed N4 and the fifth speed N5 in increasing order.

[0048] When Tout < Tout1 and E < E1, the speed of the outdoor fan switches between the first speed N1, the second speed N2 and the third speed N3.

[0049] When Tout≥Tout1 or E≥E1, the rotational speed of the outdoor fan switches between the third rotational speed N3, the fourth rotational speed N4, and the fifth rotational speed N5.

[0050] In some embodiments of the present application, the controller is connected to the indoor fan and is configured to: obtain the rotational speed V of the indoor fan, obtain the actual circulating air volume of the indoor fan in combination with the first working relationship, calculate the required heat load in the room at this time according to the actual circulating air volume and the indoor temperature difference value E, and calculate the preset values ΔT1 and ΔT2 of the outdoor heat exchange temperature difference at this time according to the law of conservation of energy.

[0051] The present application has at least the following positive effects:

[0052] The present invention provides an outdoor unit of an air conditioner. The outdoor unit of the air conditioner includes a housing, an outdoor heat exchanger, and an outdoor fan, and further includes an outdoor temperature sensor, an indoor temperature sensor, an outdoor coil temperature sensor, and a controller. The controller is configured to: when the time when the outdoor unit of the air conditioner receives the first signal is equal to t, calculate the indoor temperature difference value E, where the indoor temperature difference value E is the difference between the indoor ambient temperature Tin and the set temperature Ts; calculate the outdoor heat exchange temperature difference ΔT, where the outdoor heat exchange temperature difference ΔT is the difference between the coil temperature Tc and the outdoor ambient temperature Tout; determine the temperature difference threshold interval to which the indoor temperature difference value E belongs, and obtain the preset outdoor heat exchange temperature difference corresponding to each temperature difference threshold interval; if the outdoor heat exchange temperature difference ΔT is less than the preset outdoor heat exchange temperature difference, drive the outdoor fan to reduce the rotational speed; if the outdoor heat exchange temperature difference ΔT is not less than the preset outdoor heat exchange temperature difference, drive the outdoor fan to increase the rotational speed, so that the rotational speed of the outdoor fan is associated with the actual heat load in the room, so that the outdoor fan can accelerate or slow down the heat exchange efficiency of the outdoor heat exchanger according to the indoor load demand, and can quickly increase or decrease the temperature in the room, improving the user experience. Description of the Drawings

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0054] Figure 1 is a view of the appearance of the connection between the outdoor unit of the air conditioner and the indoor unit of the air conditioner according to an embodiment of the present application;

[0055] Figure 2 is a view of the appearance of the components connected to the controller according to an embodiment of the present application;

[0056] Figure 3It is a table corresponding to the indoor fan speed and the indoor temperature difference value E according to an embodiment of the present application;

[0057] Figure 4 It is the first working flowchart of the speed of the outdoor fan of the air conditioner outdoor unit according to an embodiment of the present application;

[0058] Figure 5 It is the second working flowchart of the speed of the outdoor fan of the air conditioner outdoor unit according to an embodiment of the present application;

[0059] Figure 6 It is the third working flowchart of the speed of the outdoor fan of the air conditioner outdoor unit according to an embodiment of the present application;

[0060] In each of the above figures: air conditioner 100; air deflector 2; air conditioner indoor unit 11; indoor air outlet 12; indoor air return opening 13; air conditioner outdoor unit 14; control device 200. Detailed Embodiments

[0061] Hereinafter, the present invention will be specifically described by way of exemplary embodiments. However, it should be understood that, without further elaboration, the elements, structures, and features in one embodiment can also be beneficially incorporated into other embodiments.

[0062] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0063] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0064] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0065] In the following, reference will be made to the appended Figures 1-6Describe the embodiments of the present application in detail.

[0066] Reference Figure 1 In some embodiments of the present application, the air conditioner 100 is a split-type air conditioner 100, including an indoor unit of the air conditioner 100, an outdoor unit 14 of the air conditioner, and an expansion valve.

[0067] The outdoor unit 14 of the air conditioner includes an outdoor heat exchanger, the indoor unit 11 of the air conditioner 100 includes an indoor heat exchanger, and the expansion valve can be disposed in the indoor unit 11 of the air conditioner 100 or the outdoor unit 14 of the air conditioner.

[0068] An indoor air outlet 12 is provided on the indoor unit 11 of the air conditioner, and the conditioned air blows out from the indoor air outlet 12.

[0069] A wind deflector 2 is provided on the indoor unit 11 of the air conditioner. The wind deflector 2 is disposed at the indoor air outlet 12, and the wind deflector 2 rotates to change the air outlet angle of the indoor air outlet 12.

[0070] An indoor air return opening 13 is provided on the indoor unit 11 of the air conditioner, and the indoor air enters the interior of the indoor unit 11 of the air conditioner from the indoor air return opening 13.

[0071] The air conditioner includes a control device 200, and the control device 200 is capable of sending a signal to the indoor unit of the air conditioner or the controller.

[0072] The control device 200 is a remote controller. Buttons are provided on the remote controller, and pressing the buttons on the remote controller is used to send different signals.

[0073] The air conditioner 100 includes a compressor, which is disposed in the outdoor unit 14 of the air conditioner and is used to compress the refrigerant to provide power for the flow of the refrigerant.

[0074] The air conditioner 100 includes a condenser, and the condenser is a heat exchanger. The refrigerant condenses in the condenser and releases heat to the outside.

[0075] The air conditioner 100 includes an expansion valve, and the refrigerant flows through the expansion valve through an expansion process.

[0076] The air conditioner 100 includes an evaporator. The air conditioner 100 performs a refrigeration cycle or a heating cycle through the compressor, the condenser, the expansion valve, and the evaporator. The refrigeration cycle and the heating cycle include a compression process, a condensation process, an expansion process, and an evaporation process. By the endothermic and exothermic processes of the refrigerant, cold or heat is provided to the indoor space to achieve temperature adjustment of the indoor space.

[0077] The compressor compresses the refrigerant gas into a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed high-temperature and high-pressure gaseous refrigerant into a liquid refrigerant, and the heat is released to the surrounding environment through the condensation process.

[0078] The liquid refrigerant flowing out of the condenser enters the expansion valve, and the expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The low-pressure liquid refrigerant flowing out of the expansion valve enters the evaporator. When the liquid refrigerant flows through the evaporator, it absorbs heat and evaporates into a low-temperature and low-pressure refrigerant gas, and the refrigerant gas in the low-temperature and low-pressure state returns to the compressor. The evaporator can achieve a refrigeration effect by using the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. During the entire cycle, the air conditioner 100 can adjust the temperature of the indoor space.

[0079] The indoor heat exchanger and the outdoor heat exchanger can be used as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner 100 serves as a heater in the heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner 100 serves as a cooler in the cooling mode.

[0080] The air conditioner outdoor unit 14 includes a housing, on which an outdoor air inlet and an outdoor air outlet are provided, and an outdoor air duct is formed inside the housing.

[0081] The air conditioner outdoor unit 14 includes an outdoor heat exchanger, and the outdoor heat exchanger is disposed inside the outdoor air duct.

[0082] The air conditioner outdoor unit 14 includes an outdoor fan, and the outdoor fan rotates to form a low-pressure area inside the outdoor air duct, driving the air flow to enter the outdoor air duct from the outdoor air inlet, exchanging heat with the outdoor heat exchanger and then flowing out from the outdoor air outlet.

[0083] The air conditioner 100 further includes an outdoor temperature sensor for measuring the outdoor ambient temperature Tout.

[0084] The air conditioner 100 further includes an indoor temperature sensor for measuring the indoor ambient temperature Tin.

[0085] The air conditioner 100 further includes an outdoor coil temperature sensor for detecting the coil temperature Tc of the outdoor heat exchanger.

[0086] Reference Figure 2 , the air conditioner outdoor unit 14 includes a controller, and the controller is connected to the outdoor fan, the outdoor temperature sensor and the indoor temperature sensor.

[0087] The controller refers to a device that can generate an operation control signal according to the instruction operation code and the timing signal, and instruct the air conditioner 100 to execute the control instruction. For example, in response to the power-on or power-off instruction issued by the user received, the controller can perform operations related to the object selected by the power-on or power-off instruction.

[0088] The embodiment of the present application further provides a schematic diagram of the hardware structure of a controller. The controller includes a processor. Optionally, it further includes a memory and a communication interface connected to the processor. The processor, the memory, and the communication interface are connected through a bus.

[0089] The processor may be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor may also be any other device with processing capabilities, such as a circuit, a device, or a software module. The processor may also include multiple CPUs, and the processor may be a single-CPU processor or a multi-CPU processor. Here, the processor may refer to one or more devices, circuits, or processing cores for processing data (such as computer program instructions).

[0090] The memory may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM), or other types of dynamic storage devices that can store information and instructions. It may also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM), or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer. The embodiment of the present application places no restrictions on this. The memory may exist independently or be integrated with the processor. Among them, the memory may contain computer program code. The processor is used to execute the computer program code stored in the memory, thereby implementing the control method of the multi-connected air conditioner 100 system provided by the embodiment of the present application.

[0091] The communication interface can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.). The communication interface can be a module, a circuit, a transceiver, or any device capable of implementing communication.

[0092] The bus can be a peripheral component interconnect (PCI) bus, an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc.

[0093] In some air conditioner outdoor units 14, the controller is configured to: adjust the rotation speed according to the outdoor ambient temperature. The control is relatively simple and does not take into account the demand of the indoor load for the rotation speed of the outdoor fan. The outdoor fan cannot meet the actual demand of the indoor load, which results in the rotation speed of the outdoor fan being too low or too high to meet the actual demand of the indoor load, and the temperature regulation of the indoor space is slow.

[0094] In some other air conditioner outdoor units 14, the controller is configured to: adjust the rotation speed of the outdoor fan according to the outdoor ambient temperature and the compressor frequency. Different rotation speeds of the outdoor motor are respectively controlled under different outdoor ambient temperatures and compressor frequencies, but the actual heat load is not considered. The coupled parameters are few. The outdoor fan only operates at a fixed rotation speed under a specific outdoor ambient temperature and a specific compressor operating frequency. It can only play a limited role in adjusting the system pressure and cannot be changed in real time according to the actual required load. The intervention of the outdoor fan in the system pressure change is low, and it cannot be adjusted in real time according to the system change, and it cannot achieve power saving. It is only controlled according to the outdoor ambient temperature and the compressor frequency, without considering the real-time heat load, and cannot be adjusted accordingly according to the actual required heat load.

[0095] This application provides an air conditioner outdoor unit 14 that can change the rotation speed of the outdoor fan according to the indoor load.

[0096] Reference Figure 3 and Figure 4 , when the air conditioner outdoor unit 14 receives the first signal, timing starts at the time when the air conditioner outdoor unit 14 receives the first signal, and the time period with a length of t is the initial stage of the air conditioner outdoor unit 14.

[0097] In some embodiments, the first signal is a power-on signal, and the controller is configured to: when the indoor unit 100 of the air conditioner receives the power-on signal, drive the indoor fan and the outdoor fan to rotate.

[0098] The power-on signal can be the first power-on signal, power-on signal after power-off, or power-on signal during shutdown. When the power-on signal is the power-on signal during shutdown, the indoor environmental temperature reaches the preset temperature threshold within a period of time, and the indoor unit of the air conditioner 100 shuts down until it is determined that the indoor environmental temperature cannot reach the preset threshold range, and then it restarts. At this time, the indoor unit of the air conditioner 100 receives the power-on signal during shutdown.

[0099] When the outdoor unit 14 of the air conditioner is in the initial stage, the indoor fan rotates at a preset indoor fan speed. The indoor fan has at least n gears, and n is not less than 1.

[0100] In some embodiments of the present application, the outdoor fan has m gears, which are the first rotation speed N1, the second rotation speed N2...... and the mth rotation speed Nm respectively, and m≥2.

[0101] In some embodiments of the present application, the outdoor fan has 5 gears, which are the first rotation speed N1, the second rotation speed N2, the third rotation speed N3, the fourth rotation speed N4 and the fifth rotation speed N5 respectively, where N1≤N2≤N3≤N4≤N5.

[0102] In the initial stage, since the outdoor heat exchanger rapidly changes temperature from room temperature, in the initial stage, the rotation speed of the outdoor fan has nothing to do with the outdoor environmental parameters and is only related to the rotation speed V of the indoor fan and the indoor temperature difference value E.

[0103] The controller is configured to: in the initial stage, obtain the rotation speed V of the indoor fan, and obtain the corresponding outdoor fan rotation speed gear range according to the gear where the rotation speed V of the indoor fan is located; judge the interval where the indoor temperature difference value E is located, and combine the second corresponding relationship to obtain the preset rotation speed of the outdoor fan, and drive the outdoor fan to rotate at the preset rotation speed; the larger the temperature value in the interval where the indoor temperature difference value E is located, the larger the preset rotation speed.

[0104] The second corresponding relationship is: the higher the gear where the rotation speed V of the indoor fan is located, the higher the maximum rotation speed within the corresponding outdoor fan rotation speed gear range.

[0105] Specifically, in the initial stage, obtain the rotation speed V of the indoor fan and the indoor temperature difference value E. When E increases, at this time, the difference between the indoor environmental temperature and the preset temperature is large, and the indoor load is large. Drive the rotation speed N of the outdoor fan to increase to meet the demand for a large indoor heat load; when the rotation speed V of the indoor fan increases, at this time, the indoor heat exchanger needs to enhance the heat exchange efficiency to meet the demand for a large heat load. The rotation speed N of the indoor and outdoor fans increases to enhance the heat exchange efficiency of the outdoor heat exchanger, so that the indoor heat exchanger and the outdoor heat exchanger respectively exchange heat efficiently, so that the indoor heat load is met, and the indoor temperature is quickly reduced or increased.

[0106] In some embodiments, n = 3, and the indoor fan has three speed gears, namely the first speed V1, the second speed Vm, and the third speed Vh.

[0107] Among them, V1 ≤ Vm ≤ Vh.

[0108] The controller is electrically connected to the indoor fan and the outdoor fan, and the controller is configured to: in the initial stage,

[0109] When the indoor fan rotates at the first speed V1, the indoor heat load is in a relatively small range, and the indoor temperature difference value E is calculated;

[0110] When E < E1, at this time the heat load is very small, and the outdoor fan is driven to rotate at the first speed N1 to save electric energy;

[0111] When E1 ≤ E ≤ E2, at this time the heat load is also in a relatively small range, and the outdoor fan is driven to rotate at the second speed N2;

[0112] When E ≥ E2, at this time the heat load is in a slightly larger range, and the outdoor fan is driven to rotate at the third speed N3;

[0113] When the indoor fan rotates at the second speed Vm, at this time the indoor heat load is in a medium range, and the indoor temperature difference value E is calculated;

[0114] When E < E1, at this time the indoor heat load is relatively small, and the outdoor fan is driven to rotate at the second speed N2;

[0115] When E1 ≤ E ≤ E2, at this time the indoor heat load is in a slightly larger range, and the outdoor fan is driven to rotate at the third speed N3;

[0116] When E ≥ E2, at this time the indoor heat load is in a large range, and the outdoor fan is driven to rotate at the fourth speed N4;

[0117] When the indoor fan rotates at the third speed Vh, at this time the indoor heat load is in a large range, and the indoor temperature difference value E is calculated;

[0118] When E < E1, at this time the indoor heat load is in a medium range, and the outdoor fan is driven to rotate at the third speed N3;

[0119] When E1 ≤ E ≤ E2, at this time the outdoor fan is in a large range, and the outdoor fan is driven to rotate at the fourth speed N4;

[0120] When E ≥ E2, at this time the outdoor fan is in the largest range, and the outdoor fan is driven to rotate at the fifth speed N5.

[0121] Reference Figure 5, when the outdoor unit 14 of the air conditioner has been turned on for a period of time and is no longer in the initial state, the rotational speed of the outdoor fan is also related to the indoor temperature difference value E and the outdoor heat exchange temperature difference ΔT.

[0122] The controller is configured to: when the time when the outdoor unit 14 of the air conditioner receives the first signal is equal to t, calculate the indoor temperature difference value E, where the indoor temperature difference value E is the difference between the indoor ambient temperature Tin and the set temperature Ts; calculate the outdoor heat exchange temperature difference ΔT, where the outdoor heat exchange temperature difference ΔT is the difference between the coil temperature Tc and the outdoor ambient temperature Tout; determine the temperature difference threshold interval to which the indoor temperature difference value E belongs, and obtain the preset outdoor heat exchange temperature difference corresponding to each temperature difference threshold interval; if the outdoor heat exchange temperature difference ΔT is less than the preset outdoor heat exchange temperature difference, drive the outdoor fan to reduce the rotational speed; if the outdoor heat exchange temperature difference ΔT is not less than the preset outdoor heat exchange temperature difference, drive the outdoor fan to increase the rotational speed, so that the rotational speed of the outdoor fan is affected by the indoor temperature difference value and the outdoor heat exchange temperature difference ΔT, and the rotational speed of the outdoor fan is changed by the indoor actual load.

[0123] Compared with the prior art, the rotational speed of the outdoor fan in this application is related to the indoor temperature difference value E and also to the outdoor heat exchange temperature difference ΔT. The indoor temperature difference value E is the difference between the indoor ambient temperature Tin and the set temperature Ts. When the indoor temperature difference value E is larger, it indicates that the difference between the indoor ambient temperature and the set temperature is larger, and it is necessary to improve the heat exchange efficiency to quickly increase or decrease the temperature. Therefore, when the temperature difference threshold interval to which the indoor temperature difference E belongs is an interval of a larger temperature, the rotational speed of the outdoor fan is set within a higher gear range; when the temperature difference threshold interval to which the indoor temperature difference E belongs is an interval of a smaller temperature, the rotational speed of the outdoor fan is set within a lower gear range, so that the rotational speed of the outdoor fan is associated with the indoor temperature difference value.

[0124] In addition, after the indoor temperature difference value E is determined, calculate the outdoor heat exchange temperature difference ΔT. ΔT is the difference between the coil temperature Tc and the outdoor ambient temperature Tout, and judge the magnitude between the outdoor heat exchange temperature difference ΔT and the preset outdoor heat exchange temperature difference.

[0125] If the outdoor heat exchange temperature difference ΔT is not less than the preset outdoor temperature difference, it indicates that the heat exchange efficiency at this time is low and the heat or cold in the coil cannot be well dissipated to the outdoor environment. It is necessary to increase the rotational speed of the outdoor fan to accelerate the heat exchange efficiency of the outdoor heat exchanger and reduce the pressure of the refrigerant, so that the system operates more stably.

[0126] If the outdoor heat exchange temperature difference ΔT is less than the preset outdoor temperature difference, it indicates that the heat exchange efficiency of the outdoor heat exchanger is relatively high. However, if the heat exchange efficiency of the outdoor heat exchanger is too high, it is easy to cause the air blown by the indoor fan to be too cold, which will form condensation in the air duct of the indoor unit of the air conditioner 100, resulting in a decrease in the heat exchange efficiency of the indoor unit of the air conditioner 100. Thus, it can be seen that the technical solution of this application correlates the indoor temperature difference value and the outdoor heat exchange temperature difference with the rotational speed of the outdoor fan, enabling the outdoor fan to change its rotational speed in coordination with the actual heat load demand indoors, thereby making the heat exchange efficiency of the air conditioner 100 higher and capable of meeting the actual load demand. In the prior art, only the compressor frequency and the outdoor ambient temperature are used to change the rotational speed of the outdoor fan, and the outdoor fan cannot rotate according to the actual load indoors. This application has obvious progress compared with the prior art.

[0127] Specifically, the controller is configured such that when the indoor temperature difference value E < E1, at this time, the difference between the indoor temperature value and the preset temperature is relatively small, and when the outdoor heat exchange temperature difference ΔT ≥ ΔT1, it indicates that the pressure in the outdoor heat exchanger of the outdoor unit 14 of the air conditioner or the refrigerant pipe of the outdoor unit 14 of the air conditioner is relatively high. It is necessary to increase the rotational speed of the outdoor fan to enhance the heat exchange efficiency and reduce the outdoor heat exchange temperature difference ΔT.

[0128] Each time the rotational speed of the outdoor fan increases by ΔN, when the outdoor heat exchange temperature difference ΔT < ΔT1, at this time, the pressure in the outdoor heat exchanger of the outdoor unit 14 of the air conditioner or the refrigerant pipe of the outdoor unit 14 of the air conditioner is relatively small, and the rotational speed of the outdoor fan is driven to decrease. Each time the rotational speed decreases by ΔN to reduce the heat exchange efficiency, so as to increase the pressure in the outdoor heat exchanger of the indoor unit 100 of the air conditioner or the refrigerant pipe of the outdoor unit 14, thereby keeping the pressure in the outdoor heat exchanger or the refrigerant pipe within an appropriate range.

[0129] In some embodiments, the controller is configured such that when the indoor temperature difference value E < E1, the indoor heat load is relatively small, and the rotational speed of the outdoor fan switches between the first rotational speed N1, the second rotational speed N2, and the third rotational speed N3. N1, N2, and N3 are relatively low rotational speeds of the outdoor fan, which can meet the demand for the relatively small indoor heat load and can reduce the power consumption of the outdoor fan.

[0130] In some embodiments, when the indoor temperature difference value E < E1, when the indoor fan rotates at the first gear rotational speed V1, the outdoor fan rotates at the first rotational speed N1; when the indoor fan rotates at the second gear rotational speed Vm, the outdoor fan rotates at the second rotational speed N2; when the indoor fan rotates at the third gear rotational speed Vh, the outdoor fan rotates at the third rotational speed N3. As the rotational speed of the indoor fan becomes faster, the rotational speed of the outdoor fan also becomes faster to adapt to the higher load demand and quickly reduce or increase the indoor temperature.

[0131] The controller is configured such that when E1 ≤ E < E2, the difference between the indoor temperature value and the preset temperature is relatively large. When the outdoor heat exchange temperature difference ΔT ≥ ΔT2, it indicates that the pressure in the outdoor heat exchanger of the outdoor unit 14 of the air conditioner or in the refrigerant pipe of the outdoor unit 14 of the air conditioner is relatively high, and the indoor heat load is relatively large. It is necessary to increase the rotational speed of the outdoor fan to enhance the heat exchange efficiency of the outdoor heat exchanger, so as to reduce the outdoor heat exchange temperature difference ΔT and keep the refrigerant pressure of the outdoor unit 14 of the air conditioner within a reasonable range;

[0132] Each time the rotational speed of the outdoor fan increases by ΔN, when the outdoor heat exchange temperature difference ΔT < ΔT2, the pressure in the outdoor heat exchanger of the outdoor unit 14 of the air conditioner or in the refrigerant pipe of the outdoor unit 14 of the air conditioner is relatively low. Drive the rotational speed of the outdoor fan to decrease, and each time the rotational speed decreases by ΔN, to reduce the heat exchange efficiency, so as to increase the pressure in the outdoor heat exchanger of the indoor unit 100 of the air conditioner or in the refrigerant pipe of the outdoor unit 14, thereby keeping the pressure in the outdoor heat exchanger or the refrigerant pipe within an appropriate range.

[0133] The controller is configured such that when the indoor temperature difference value E1 ≤ E < E2, the indoor heat load is relatively large, and the rotational speed of the outdoor fan switches between the second rotational speed N2, the third rotational speed N3, and the fourth rotational speed N4. N2, N3, and N4 are relatively low rotational speeds of the outdoor fan, which can meet the demand for the relatively large indoor heat load and accelerate the decrease or increase of the indoor temperature.

[0134] In some embodiments, when the indoor temperature difference value E1 ≤ E < E2, when the indoor fan rotates at the first gear rotational speed V1, the outdoor fan rotates at the second rotational speed N2; when the indoor fan rotates at the second gear rotational speed Vm, the outdoor fan rotates at the third rotational speed N3; when the indoor fan rotates at the third gear rotational speed Vh, the outdoor fan rotates at the fourth rotational speed N4. As the rotational speed of the indoor fan becomes faster, the rotational speed of the outdoor fan also becomes faster to adapt to the higher load demand and quickly reduce or increase the indoor temperature.

[0135] The controller is configured such that when E ≥ E2, the difference between the indoor temperature value and the preset temperature is the largest. When the outdoor heat exchange temperature difference ΔT ≥ ΔT3, it indicates that the pressure in the outdoor heat exchanger of the outdoor unit 14 of the air conditioner or in the refrigerant pipe of the outdoor unit 14 of the air conditioner is relatively high, and the indoor heat load is relatively large. It is necessary to increase the rotational speed of the outdoor fan to enhance the heat exchange efficiency of the outdoor heat exchanger, so as to reduce the outdoor heat exchange temperature difference ΔT and keep the refrigerant pressure of the outdoor unit 14 of the air conditioner within a reasonable range;

[0136] Each time the rotational speed of the outdoor fan increases by ΔN, when the outdoor heat exchange temperature difference ΔT < ΔT3, the pressure in the outdoor heat exchanger of the outdoor unit 14 of the air conditioner or in the refrigerant pipe of the outdoor unit 14 of the air conditioner is relatively small at this time, and the rotational speed of the driving outdoor fan is reduced by ΔN each time, so as to reduce the heat exchange efficiency, so that the pressure of the outdoor heat exchanger of the indoor unit 100 of the air conditioner or the refrigerant pipe of the outdoor unit 14 of the air conditioner increases, so as to keep the pressure of the outdoor heat exchanger or the refrigerant pipe within an appropriate range, and keep the cold air blown by the indoor fan within a reasonable range, thereby reducing the risk of condensation in the air outlet or air duct of the air conditioner 100 caused by the too low temperature of the cold air.

[0137] The controller is configured to: when the indoor temperature difference value E ≥ E2, the indoor heat load is relatively small, and the rotational speed of the outdoor fan switches between the third rotational speed N3, the fourth rotational speed N4 and the fifth rotational speed N5. N3, N4 and N5 are relatively small rotational speeds of the outdoor fan, which can meet the requirements of the relatively small indoor heat load and can reduce the power consumption of the outdoor fan.

[0138] In some embodiments, when the indoor temperature difference value E ≥ E2, when the indoor fan rotates at the first gear rotational speed V1, the outdoor fan rotates at the third rotational speed N3; when the indoor fan rotates at the second gear rotational speed Vm, the outdoor fan rotates at the fourth rotational speed N4; when the indoor fan rotates at the third gear rotational speed Vh, the outdoor fan rotates at the fifth rotational speed N5. As the rotational speed of the indoor fan becomes faster, the rotational speed of the outdoor fan also becomes faster to adapt to the higher load demand and quickly reduce or increase the indoor temperature.

[0139] It should be noted that ΔT1 ≤ ΔT2 ≤ ΔT3, so that in different intervals of different indoor temperature difference values E, there can be different standards for the outdoor heat exchange temperature difference, and the pressure is adjusted according to different ΔT1, ΔT2 and ΔT3 respectively, so as to keep the pressure of the refrigerant in the outdoor unit 14 of the air conditioner within an appropriate range.

[0140] In some embodiments, according to the actual rotational speed of the indoor fan set by the user and combined with the first working relationship, the actual circulating air volume of the indoor fan can be obtained. By calculating the indoor required heat load through the actual circulating air volume and the indoor temperature difference value E, and then according to the law of conservation of energy, the heat released or absorbed from the indoor space is equal to the heat released or absorbed to the outdoor space, and the preset values ΔT1, ΔT2 and ΔT3 of the outdoor heat exchange temperature difference at this time can be calculated.

[0141] The controller is further configured to: after the outdoor fan rotates at a fixed speed for a time t1, obtain the rotation speed of the indoor fan again, recalculate the indoor temperature difference value E, and determine the rotation speed of the outdoor fan according to the latest outdoor heat exchange temperature difference ΔT and the temperature difference value E, and drive the outdoor fan to rotate at this speed, so that the rotation speed of the outdoor fan changes with the change of the indoor load, and can more flexibly cooperate with the demand of the indoor heat load to adjust the outdoor fan.

[0142] This application also provides another outdoor unit 14 of an air conditioner that can change the rotation speed of the outdoor fan according to the real-time load indoors.

[0143] When the outdoor unit 14 of the air conditioner receives the first signal, timing starts at the time when the outdoor unit 14 of the air conditioner receives the first signal, and the time period with a length of t is the initial stage of the outdoor unit 14 of the air conditioner.

[0144] In some embodiments, the first signal is a startup signal. The indoor unit 100 of the air conditioner receives the startup signal, and the controller is configured to: drive the indoor fan and the outdoor fan to rotate.

[0145] The startup signal can be a first startup signal, a power-on startup signal, or a stop-startup signal. When the startup signal is a stop-startup signal, the indoor environmental temperature reaches the preset temperature threshold within a period of time, and the indoor unit 100 of the air conditioner stops until it is determined that the indoor environmental temperature cannot reach the preset threshold range, and then restarts. At this time, the indoor unit 100 of the air conditioner receives the stop-startup signal.

[0146] When the outdoor unit 14 of the air conditioner is in the initial stage, the indoor fan rotates at a preset indoor fan speed. The indoor fan has at least n gears, and n is not less than 1.

[0147] In some embodiments of this application, the outdoor fan has m gears, which are the first rotation speed N1, the second rotation speed N2...... and the mth rotation speed Nm respectively, and m≥2.

[0148] In some embodiments of this application, the outdoor fan has 5 gears, which are the first rotation speed N1, the second rotation speed N2, the third rotation speed N3, the fourth rotation speed N4 and the fifth rotation speed N5 respectively, where N1≤N2≤N3≤N4≤N5.

[0149] In the initial stage, since the temperature of the outdoor heat exchanger changes rapidly from room temperature, in the initial stage, the rotation speed of the outdoor fan has nothing to do with the outdoor environmental parameters and only relates to the rotation speed V of the indoor fan and the indoor temperature difference value E.

[0150] The controller is configured to: in the initial stage, obtain the indoor fan speed V, and obtain the corresponding outdoor fan speed range according to the gear in which the indoor fan speed V is located; determine the interval in which the indoor temperature difference value E is located, and obtain the preset speed of the outdoor fan in combination with the second corresponding relationship, and drive the outdoor fan to rotate at the preset speed; the larger the temperature value in the interval in which the indoor temperature difference value E is located, the larger the preset speed.

[0151] In some embodiments, n = 3, and the indoor fan has three gears, namely the first gear speed V1, the second gear speed Vm, and the third gear speed Vh.

[0152] Wherein, V1 ≤ Vm ≤ Vh.

[0153] The controller is electrically connected to the indoor fan and the outdoor fan. The controller is configured to: in the initial stage,

[0154] When the indoor fan rotates at the first gear speed V1, the indoor heat load is in a relatively small range, and the indoor temperature difference value E is calculated;

[0155] When E < E1, at this time the heat load is very small, and the outdoor fan is driven to rotate at the first speed N1 to save electric energy;

[0156] When E1 ≤ E < E2, at this time the heat load is also in a relatively small range, and the outdoor fan is driven to rotate at the second speed N2;

[0157] When E ≥ E2, at this time the heat load is in a slightly larger range, and the outdoor fan is driven to rotate at the third speed N3;

[0158] When the indoor fan rotates at the second gear speed Vm, at this time the indoor heat load is in a medium range, and the indoor temperature difference value E is calculated;

[0159] When E < E1, at this time the indoor heat load is relatively small, and the outdoor fan is driven to rotate at the second speed N2;

[0160] When E1 ≤ E ≤ E2, at this time the indoor heat load is in a slightly larger range, and the outdoor fan is driven to rotate at the third speed N3;

[0161] When E ≥ E2, at this time the indoor heat load is in a larger range, and the outdoor fan is driven to rotate at the fourth speed N4;

[0162] When the indoor fan rotates at the third gear speed Vh, at this time the indoor heat load is in a larger range, and the indoor temperature difference value E is calculated;

[0163] When E < E1, at this time the indoor heat load is in a medium range, and the outdoor fan is driven to rotate at the third speed N3;

[0164] When E1 ≤ E ≤ E2, at this time the outdoor fan is within a relatively large range, and the outdoor fan is driven to rotate at the fourth speed N4;

[0165] When E ≥ E2, at this time the outdoor fan is within the maximum range, and the outdoor fan is driven to rotate at the fifth speed N5.

[0166] Reference Figure 6 , the controller is further configured to calculate the indoor temperature difference value E when the time when the air conditioner outdoor unit 14 receives the first signal is equal to t. The indoor temperature difference value E is the difference between the indoor ambient temperature Tin and the set temperature Ts; obtain the outdoor ambient temperature Tout; calculate the outdoor heat exchange temperature difference ΔT, and the outdoor heat exchange temperature difference ΔT is the difference between the coil temperature Tc and the outdoor ambient temperature Tout; when Tout < Tout1 and E < E1, if the outdoor heat exchange temperature difference ΔT is not less than the preset outdoor heat exchange temperature difference ΔT1, then drive the outdoor fan to increase the speed, otherwise, drive the speed of the outdoor fan to decrease; when Tout ≥ Tout1 or E ≥ E1, if the outdoor heat exchange temperature difference ΔT is not less than the preset outdoor heat exchange temperature difference ΔT2, then drive the outdoor fan to increase the speed; otherwise, drive the speed of the outdoor fan to decrease; ΔT1 ≤ ΔT2, so that the speed of the outdoor fan is affected by the indoor temperature difference value, the outdoor ambient temperature Tout and the outdoor heat exchange temperature difference ΔT, so that the outdoor fan changes the speed under the influence of the actual indoor load.

[0167] Compared with the prior art, the speed of the outdoor fan in the present application is associated with the outdoor ambient temperature and the outdoor heat exchange temperature difference. When the outdoor ambient temperature is relatively high or the indoor temperature difference value E is relatively high, a relatively high speed of the outdoor fan is required to improve the heat exchange efficiency of the indoor heat exchanger to meet the demand of a relatively high indoor load. When the outdoor ambient temperature is relatively low and the indoor temperature difference value E is relatively low, a relatively low speed of the outdoor fan is required to reduce the heat exchange efficiency of the outdoor heat exchanger, so that the air blown by the indoor fan will not be too low in temperature, thereby reducing the probability of condensation in the indoor air duct of the indoor unit of the air conditioner 100, and reducing the electric energy consumed by the outdoor fan;

[0168] When the outdoor heat exchange temperature difference is not less than the preset outdoor heat exchange temperature difference, it indicates that there is a relatively large difference between the coil temperature of the outdoor heat exchanger and the outdoor ambient temperature at this time, and the heat exchange efficiency of the outdoor heat exchanger is relatively low. Therefore, it is necessary to increase the speed of the outdoor fan to improve the efficiency of the outdoor heat exchanger. Compared with the prior art technical solution of changing the speed of the outdoor fan according to the compressor frequency and the outdoor ambient temperature, the technical solution of the present application can associate the actual indoor load with the speed of the outdoor fan, increase the speed when the load is large, and reduce the speed when the load is small, which can meet the actual needs of the indoor load and has obvious progress compared with the prior art.

[0169] Specifically, the controller is configured such that when the time of receiving the first signal is equal to t, if the indoor temperature difference value E < E1 and Tout < Tout1, at this time the indoor load is small. When the outdoor heat exchange temperature difference ΔT ≥ ΔT1, at this time the refrigerant pressure in the outdoor heat exchanger and the refrigerant pipe of the air conditioner outdoor unit 14 is too high, and the heat exchange efficiency needs to be enhanced. The rotational speed of the outdoor fan increases by ΔN compared to before, so that the refrigerant pressure in the outdoor heat exchanger and the refrigerant pipe decreases, thereby reducing the outdoor heat exchange temperature difference ΔT, and thus reducing the pressure of the containers through which the refrigerant flows, such as the outdoor heat exchanger and the refrigerant pipe of the air conditioner outdoor unit 14;

[0170] Each time the rotational speed of the outdoor fan is increased by ΔN, when the outdoor heat exchange temperature difference ΔT < ΔT1, at this time the refrigerant pressure in the outdoor heat exchanger and the refrigerant pipe of the air conditioner outdoor unit 14 is too low, and the rotational speed of the outdoor fan needs to be reduced so that the outdoor heat exchange temperature difference ΔT increases. Each time the rotational speed of the outdoor fan is reduced by ΔN until the outdoor heat exchange temperature difference ΔT > ΔT1, then the reduction of the rotational speed of the outdoor fan stops. By adjusting the rotational speed of the outdoor fan, the refrigerant pressure in the outdoor heat exchanger and the refrigerant pipe is reduced, so that the refrigerant pressure in the outdoor heat exchanger and the refrigerant pipe is maintained within an appropriate range.

[0171] The controller is further configured such that when the time of receiving the first signal is equal to t, if the indoor temperature difference value E satisfies E < E1 and Tout < Tout1, the indoor heat load is relatively small, and the rotational speed of the outdoor fan switches between the first rotational speed N1, the second rotational speed N2, and the third rotational speed N3. N1, N2, and N3 are relatively low rotational speeds of the outdoor fan, which can meet the requirements of the relatively small indoor heat load and can reduce the power consumption of the outdoor fan.

[0172] The controller is further configured such that after the outdoor fan maintains a certain fixed rotational speed for t time, it re - judges the magnitude relationship between the indoor temperature difference value and E1, and re - judges the magnitude relationship between Tout and Tout1. According to the magnitude relationships between E and E1 and between Tout and Tout1, it re - judges the magnitude relationship between the outdoor heat exchange temperature difference value and ΔT1, and adjusts the rotational speed of the outdoor fan again so that the rotational speed of the outdoor fan matches the actual demand of the indoor load.

[0173] Specifically, the controller is further configured such that when the time of receiving the first signal is equal to t, if the indoor temperature difference value E ≥ E1 or Tout ≥ Tout1, at this time the indoor heat load is very large. Therefore, a relatively large rotational speed of the outdoor fan is required to meet the heat dissipation demand of the outdoor heat exchanger, and the outdoor fan is driven to operate at a relatively large rotational speed. Then, the magnitude relationship between the outdoor heat exchange temperature difference ΔT and ΔT2 is judged:

[0174] When the outdoor heat exchange temperature difference ΔT ≥ ΔT2, the refrigerant pressures in the outdoor heat exchanger of the outdoor unit 14 of the air conditioner and in the refrigerant pipes are too high, and it is necessary to enhance the heat exchange efficiency. The rotational speed of the outdoor fan increases by ΔN compared to before, so that the refrigerant pressures in the outdoor heat exchanger and in the refrigerant pipes decrease, thereby reducing the outdoor heat exchange temperature difference ΔT, and thus reducing the pressures of the containers through which the refrigerant flows, such as the outdoor heat exchanger and the refrigerant pipes of the outdoor unit 14 of the air conditioner;

[0175] Gradually increase the rotational speed of the outdoor fan until the outdoor heat exchange temperature difference ΔT < ΔT2. At this time, the refrigerant pressures in the outdoor heat exchanger of the outdoor unit 14 of the air conditioner and in the refrigerant pipes are too low, and it is necessary to reduce the rotational speed of the outdoor fan so as to increase the outdoor heat exchange temperature difference ΔT. Each time the rotational speed of the outdoor fan is reduced by ΔN until the outdoor heat exchange temperature difference ΔT > ΔT2, then stop reducing the rotational speed of the outdoor fan. By adjusting the rotational speed of the outdoor fan, the refrigerant pressures in the outdoor heat exchanger and in the refrigerant pipes are reduced, so that the refrigerant pressures in the outdoor heat exchanger and in the refrigerant pipes are maintained within an appropriate range.

[0176] The controller is configured to: obtain the rotational speed V of the indoor fan, obtain the actual circulating air volume of the indoor fan in combination with the first working relationship, and calculate the heat load required indoors at this time according to the actual circulating air volume and the indoor temperature difference value E. According to the law of conservation of energy, the preset values ΔT1 and ΔT2 of the outdoor heat exchange temperature difference at this time can be calculated.

[0177] The controller is further configured to: when the time when the first signal is received is equal to t, if the indoor temperature difference value E ≥ E1 or Tout ≥ Tout1, the heat load indoors is relatively small, and drive the rotational speed of the outdoor fan to switch among the third rotational speed N3, the fourth rotational speed N4, and the fifth rotational speed N5. N3, N4, and N5 are relatively large rotational speeds of the outdoor fan, which can meet the requirements of a relatively large heat load in the indoor space, so as to quickly increase or decrease the temperature in the indoor space, so that the user can quickly maintain the temperature in the indoor space within the required range.

[0178] It should be noted that the difference between N1, N2, N3, N4, and N5 is ΔN, and ΔN is a fixed value. The rotational speed of the outdoor fan increases or decreases by ΔN so that the rotational speed of the outdoor fan switches among N1, N2, N3, N4, and N5.

[0179] Reference Figure 4 , the present application further provides an outdoor unit 14 of an air conditioner that can change the rotational speed of the outdoor fan according to the indoor load.

[0180] When the outdoor unit 14 of the air conditioner receives the first signal, timing starts at the time when the outdoor unit 14 of the air conditioner receives the first signal, and the time period with a length of t is the initial stage of the outdoor unit 14 of the air conditioner.

[0181] In some embodiments, the first signal is a power-on signal. The indoor unit 100 of the air conditioner receives the power-on signal, and the controller is configured to drive the indoor fan and the outdoor fan to rotate.

[0182] When the outdoor unit 14 of the air conditioner is in the initial stage, the indoor fan rotates at a preset indoor fan speed. The indoor fan has at least n gears, and n is not less than 1.

[0183] In some embodiments, n = 3. The indoor fan has three gears, namely the first gear speed V1, the second gear speed Vm, and the third gear speed Vh.

[0184] Wherein, V1 ≤ Vm ≤ Vh.

[0185] The controller is electrically connected to the indoor fan and the outdoor fan, and the controller is configured to:

[0186] When the indoor fan rotates at the first gear speed V1, calculate the indoor temperature difference value E;

[0187] When the indoor fan rotates at the first gear speed V1, the indoor heat load is in a relatively small range, and calculate the indoor temperature difference value E;

[0188] When E < E1, at this time the heat load is very small, drive the outdoor fan to rotate at the first speed N1 to save electric energy;

[0189] When E1 ≤ E ≤ E2, at this time the heat load is also in a relatively small range, drive the outdoor fan to rotate at the second speed N2;

[0190] When E ≥ E2, at this time the heat load is in a slightly larger range, drive the outdoor fan to rotate at the third speed N3;

[0191] When the indoor fan rotates at the second gear speed Vm, at this time the indoor heat load is in a medium range, calculate the indoor temperature difference value E;

[0192] When E < E1, at this time the indoor heat load is relatively small, drive the outdoor fan to rotate at the second speed N2;

[0193] When E1 ≤ E ≤ E2, at this time the indoor heat load is in a slightly larger range, drive the outdoor fan to rotate at the third speed N3;

[0194] When E ≥ E2, at this time the indoor heat load is in a larger range, drive the outdoor fan to rotate at the fourth speed N4;

[0195] When the indoor fan rotates at the third gear speed Vh, at this time the indoor heat load is in a larger range, calculate the indoor temperature difference value E;

[0196] When E < E1, the indoor heat load is within a medium range at this time, and the outdoor fan is driven to rotate at the third speed N3;

[0197] When E1 ≤ E ≤ E2, the outdoor fan is within a relatively large range at this time, and the outdoor fan is driven to rotate at the fourth speed N4;

[0198] When E ≥ E2, the outdoor fan is within the maximum range at this time, and the outdoor fan is driven to rotate at the fifth speed N5. In some embodiments of the present application, when the air conditioner 100 is in the cooling mode, the indoor temperature difference value E = the difference between the indoor environmental temperature and the set temperature, and when the air conditioner 100 is in the heating mode, the indoor temperature difference value E = the difference between the set temperature and the indoor environmental temperature.

[0199] E1 and E2 are respectively preset temperature differences, where E1 ≤ E2.

[0200] In some embodiments of the present application, the air conditioner 100 includes an indoor temperature sensing module. The indoor temperature sensing module is an indoor temperature sensor or an indoor temperature sensing unit, which can detect the indoor environmental temperature. The indoor temperature sensing module is connected to the controller and uploads the detected temperature signal to the controller. The controller calculates the indoor temperature difference value E according to the indoor environmental temperature and the set temperature.

[0201] The controller is further configured to: after the outdoor fan rotates at a fixed speed for t1 time, re-obtain the speed of the indoor fan, and re-calculate the indoor temperature difference value E, and judge the current speed of the outdoor fan according to the latest speed of the indoor fan and the temperature difference value E, and drive the outdoor fan to rotate at the current speed.

[0202] In some embodiments of the present application, the outdoor fan has m gears, which are respectively the first speed N1, the second speed N2...... and the mth speed Nm, m ≥ 2.

[0203] In some embodiments of the present application, the outdoor fan has 5 gears, which are respectively the first speed N1, the second speed N2, the third speed N3, the fourth speed N4 and the fifth speed N5, where N1 ≤ N2 ≤ N3 ≤ N4 ≤ N5.

[0204] When the speed of the indoor fan is relatively high, the indoor evaporator exchanges heat with air at a relatively high heat exchange efficiency, and the outdoor fan also needs to rotate at a relatively high speed so that the heat exchange efficiency of the outdoor heat exchanger is relatively high, and the load demand of the air conditioner 100 can be met to keep the system of the air conditioner 100 balanced.

[0205] When the indoor temperature difference value E is large, the difference between the preset temperature and the indoor ambient temperature is large at this time. The indoor unit of the air conditioner 100 needs to quickly release cold or heat to quickly reach the preset indoor temperature. The outdoor fan needs to rotate at a relatively high speed so that a large amount of air flows through the surface of the outdoor heat exchanger and exchanges heat with the outdoor heat exchanger to accelerate the heat exchange efficiency of the outdoor heat exchanger, so that the outdoor fan can meet the high-load demand of the indoor unit of the air conditioner 100 at this time.

[0206] Therefore, the higher the rotation speed of the indoor fan, the larger the indoor temperature difference value E, and the larger the rotation speed of the outdoor fan, so that the outdoor fan can adapt to the high-load demand, quickly reduce or increase the indoor temperature, and improve the user experience; when the rotation speed of the outdoor fan is lower, the indoor temperature difference value E is smaller, and the rotation speed of the outdoor fan is smaller, so that the outdoor fan can meet the low-load demand, reduce the power consumption of the outdoor fan, and make the operation of the outdoor unit 14 of the air conditioner more energy-efficient.

[0207] It should be noted that when the rotation speed of the indoor fan is low, the rotation speed of the outdoor fan should not be too high. If the rotation speed of the outdoor fan is too high, it is easy to cause the temperature of the cold air blown by the indoor fan to be too low, and the water vapor in the air is likely to condense when it encounters the cold air at too low a temperature, condensing on the surface of the indoor heat exchanger and reducing the heat exchange efficiency of the indoor heat exchanger. Only when the rotation speed of the outdoor fan is in a not-too-high range, the temperature of the air blown by the indoor fan is in a relatively normal range, reducing the probability of a large amount of condensation forming in the indoor heat exchanger or the indoor air duct due to too low a blowing temperature.

[0208] It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the schematic diagram, in some cases, the steps described or shown can be executed in an order different from that here.

[0209] The outdoor unit 14 of the air conditioner provided by the embodiments of the present invention can be applied to the air conditioner 100. In some embodiments of the present invention, the air conditioner 100 can be a household air conditioner 100 or an industrial air conditioner 100. In some embodiments of the present invention, the air conditioner 100 can be a single air conditioner 100, such as a cabinet air conditioner 100 or a wall-mounted air conditioner 100; in some embodiments of the present invention, the air conditioner 100 can also be an air conditioner unit composed of multiple air conditioners 100, such as a multi-split air conditioner 100 composed of multiple air conditioners 100.

[0210] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An outdoor air conditioner unit, characterized in that, Comprising: A housing, on which an outdoor air inlet and an outdoor air outlet are provided, and an outdoor air duct communicating with the outdoor air inlet and the outdoor air outlet is formed inside the housing; An outdoor heat exchanger, which is arranged in the outdoor air duct; An outdoor fan, which is communicated with the outdoor air duct, and the outdoor fan rotates to drive air flow to enter the outdoor air duct from the outdoor air inlet, and after exchanging heat with the outdoor heat exchanger, blows out from the outdoor air outlet; An outdoor temperature sensor, which is used for measuring the outdoor ambient temperature Tout; An indoor temperature sensor, which is used for measuring the indoor ambient temperature Tin; An outdoor coil temperature sensor, which is used for detecting the coil temperature Tc of the outdoor heat exchanger; A controller, which is connected with the outdoor fan, the outdoor temperature sensor and the indoor temperature sensor; The controller is configured to: When the time after the air conditioner outdoor unit receives the first signal is equal to t, Calculate the indoor temperature difference value E, and the indoor temperature difference value E is the difference between the indoor ambient temperature Tin and the set temperature Ts; Calculate the outdoor heat exchange temperature difference △T, and the outdoor heat exchange temperature difference △T is the difference between the coil temperature Tc and the outdoor ambient temperature Tout; Judge the temperature difference threshold interval to which the indoor temperature difference value E belongs, and obtain the preset outdoor heat exchange temperature difference corresponding to each temperature difference threshold interval in combination with the first comparison relationship; If the outdoor heat exchange temperature difference △T is less than the preset outdoor heat exchange temperature difference, then drive the outdoor fan to reduce the rotation speed; If the outdoor heat exchange temperature difference △T is not less than the preset outdoor heat exchange temperature difference, then drive the outdoor fan to increase the rotation speed.

2. The air conditioner outdoor unit according to claim 1, characterized in that, The first comparison relationship is: when E < E1, the preset outdoor heat exchange temperature difference is △T1; when E1 ≤ E < E2, the preset outdoor heat exchange temperature difference is △T2; when E ≥ E2, the preset outdoor heat exchange temperature difference is △T3, and △T1 ≤ △T2 ≤ △T3.

3. The air conditioner outdoor unit according to claim 2, characterized in that, The controller is connected with the indoor fan, and the controller is configured to: obtain the rotation speed V of the indoor fan, obtain the actual circulating air volume of the indoor fan in combination with the first working relationship, calculate the heat load required indoors at this time according to the actual circulating air volume and the indoor temperature difference value E, and calculate the preset values △T1, △T2 and △T3 of the outdoor heat exchange temperature difference at this time according to the law of conservation of energy.

4. The air conditioner outdoor unit according to claim 1 or 2, characterized in that, The outdoor fan has a first rotation speed N1, a second rotation speed N2, a third rotation speed N3, a fourth rotation speed N4 and a fifth rotation speed N5 that increase in sequence; the controller is connected with the indoor fan, and the indoor fan has a first gear rotation speed V1, a second gear rotation speed Vm and a third gear rotation speed Vh that increase in sequence; When the indoor fan rotates at the first gear rotation speed V1, the outdoor fan switches between the first rotation speed N1, the second rotation speed N2 and the third rotation speed N3; When the indoor fan rotates at the second gear rotation speed Vm, the outdoor fan switches between the second rotation speed N2, the third rotation speed N3 and the fourth rotation speed N4; When the indoor fan rotates at the third gear rotation speed Vh, the outdoor fan switches between the third rotation speed N3, the fourth rotation speed N4 and the fifth rotation speed N5.

5. An outdoor unit of an air conditioner, characterized in that, Comprising: A housing, on which an outdoor air inlet and an outdoor air outlet are provided, and an outdoor air duct communicating with the outdoor air inlet and the outdoor air outlet is formed inside the housing; An outdoor heat exchanger, which is disposed in the outdoor air duct; An outdoor fan, which is communicated with the outdoor air duct, and the outdoor fan rotates to drive air flow to enter the outdoor air duct from the outdoor air inlet, exchange heat with the outdoor heat exchanger, and then blow out from the outdoor air outlet; An outdoor temperature sensor, which is used to measure the outdoor ambient temperature Tout; An indoor temperature sensor, which is used to measure the indoor ambient temperature Tin; An outdoor coil temperature sensor, which is used to detect the coil temperature Tc of the outdoor heat exchanger; A controller, which is connected to the outdoor fan, the outdoor temperature sensor and the indoor temperature sensor; The controller is configured to: When the time after the air conditioner outdoor unit receives the first signal is equal to t, Calculate the indoor temperature difference value E, where the indoor temperature difference value E is the difference between the indoor ambient temperature Tin and the set temperature Ts; Obtain the outdoor ambient temperature Tout; Calculate the outdoor heat exchange temperature difference △T, where the outdoor heat exchange temperature difference △T is the difference between the coil temperature Tc and the outdoor ambient temperature Tout; When Tout < Tout1 and E < E1, if the outdoor heat exchange temperature difference △T is not less than the preset outdoor heat exchange temperature difference △T1, then drive the outdoor fan to increase the rotation speed, otherwise, drive the rotation speed of the outdoor fan to decrease; When Tout ≥ Tout1 or E ≥ E1, if the outdoor heat exchange temperature difference △T is not less than the preset outdoor heat exchange temperature difference △T2, then drive the outdoor fan to increase the rotation speed; Otherwise, drive the rotation speed of the outdoor fan to decrease; △T1 ≤ △T2.

6. The air conditioner outdoor unit according to claim 1 or 5, characterized in that, When the outdoor fan receives the first signal, start timing at the time when the air conditioner outdoor unit receives the first signal, and define the time period with a duration of t as the initial stage of the air conditioner outdoor unit; The controller is configured to: in the initial stage, obtain the indoor fan rotation speed V, and obtain the corresponding outdoor fan rotation speed range according to the gear where the indoor fan rotation speed V is located; Judge the interval where the indoor temperature difference value E is located, and obtain the preset rotation speed of the outdoor fan in combination with the second corresponding relationship, and drive the outdoor fan to rotate at the preset rotation speed; The larger the temperature value in the interval where the indoor temperature difference value E is located, the larger the preset rotation speed.

7. The air conditioner outdoor unit according to claim 6, wherein The outdoor fan has m gears, m ≥ 2; the indoor fan has at least n gears, n ≥ 2; The second corresponding relationship is: the higher the gear where the rotation speed V of the indoor fan is located, the higher the maximum rotation speed in the corresponding outdoor fan rotation speed range.

8. The air conditioner outdoor unit according to claim 1 or 5, characterized in that, The controller is connected to the indoor fan, and the controller is configured to: after the outdoor fan rotates at a fixed rotation speed for t1 time, re-obtain the indoor fan rotation speed V, re-calculate the indoor temperature difference value E, obtain the rotation speed of the outdoor fan according to the latest outdoor heat exchange temperature difference △T and the temperature difference value E, and drive the outdoor fan to rotate at this rotation speed.

9. The air conditioner outdoor unit according to claim 5, wherein The outdoor fan has a first rotation speed N1, a second rotation speed N2, a third rotation speed N3, a fourth rotation speed N4 and a fifth rotation speed N5 that increase in sequence; When Tout < Tout1 and E < E1, the rotation speed of the outdoor fan switches between the first rotation speed N1, the second rotation speed N2 and the third rotation speed N3; When Tout≥Tout1 or E≥E1, the rotational speed of the outdoor fan switches between the third rotational speed N3, the fourth rotational speed N4, and the fifth rotational speed N5.

10. The air conditioner outdoor unit according to claim 5, characterized in that, The controller is connected to the indoor fan and is configured to: obtain the rotational speed V of the indoor fan, obtain the actual circulating air volume of the indoor fan according to the first working relationship, calculate the required heat load in the room at this time according to the actual circulating air volume and the indoor temperature difference value E, and calculate the preset values △T1 and △T2 of the outdoor heat exchange temperature difference at this time according to the law of conservation of energy.

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