Air conditioner

Abstract

The invention provides an air conditioner which comprises a refrigerant circulation loop formed by circulation of a compressor, an outdoor heat exchanger, a first expansion valve, a first indoor heat exchanger, a second expansion valve and a second indoor heat exchanger. The indoor temperature detection device is used for detecting the indoor temperature, the indoor humidity detection device is used for detecting the indoor humidity, and the first inner coil pipe temperature detection device and the second inner coil pipe temperature detection device are used for detecting the temperature of a coil pipe in the indoor heat exchanger. According to the relation between the set temperature and the indoor temperature, a target sub-mode in the first mode is judged, when the set humidity is lower than the indoor humidity, the judged target sub-mode is started, and the opening degree of a first expansion valve and the opening degree of a second expansion valve are adjusted according to the inner disc temperature of the two indoor heat exchangers, so that the multi-stage dehumidification control technology is achieved; and switching among a plurality of target sub-modes is realized.

Description

Technical Field

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

[0002] The climate and building loads in different regions of my country vary significantly. For example, in medium-low temperature and high-humidity environments such as the plum rain season, the return of the south wind, and the hot and humid days in Qingdao, users usually turn on the air-conditioning dehumidification function to reduce the indoor air humidity. While dehumidifying, it also adjusts the indoor temperature to make users feel comfortable.

[0003] In the related art, the dehumidification mode is to make the temperature of the wet air to be treated lower than the dew point temperature under the current atmospheric pressure after passing through the indoor heat exchanger for heat exchange, so as to condense the water vapor in the wet air to reduce the humidity in the room. However, since the dehumidification process also takes away some heat, it will inevitably cause the indoor temperature to drop, resulting in the phenomenon of overcooling in the room or poor actual dehumidification effect.

[0004] In order to solve this problem, it is necessary to implement multi-stage dehumidification technology that takes into account the thermal comfort of users. The relevant technology only has three dehumidification functions: cooling, heating and constant temperature. It fails to achieve a more accurate dehumidification purpose and has obvious defects.

[0005] In view of this, this application is filed. Summary of the invention

[0006] The present application provides an air conditioner, which controls two expansion valves according to the indoor ambient temperature and the indoor ambient humidity, and adjusts the condensing temperature and evaporating temperature of the front part and the rear part of the indoor heat exchanger respectively, so as to realize a multi-mode dehumidification control technology of reheating, no cooling, slight cooling and cooling dehumidification, so as to adapt to the heat and humidity loads in different environments and improve the user's comfort.

[0007] The present application provides an air conditioner, comprising:

[0008] The indoor unit comprises:

[0009] Indoor shell;

[0010] A first indoor heat exchanger is disposed in the indoor housing, and the first indoor heat exchanger operates as a condenser in a first mode;

[0011] A second indoor heat exchanger is disposed in the indoor housing, and the second indoor heat exchanger operates as an evaporator in the first mode;

[0012] The second expansion valve is disposed between the first indoor heat exchanger and the second indoor heat exchanger, and adjusts the refrigerant flow between the first indoor heat exchanger and the second indoor heat exchanger by adjusting its opening degree, so as to adjust the heat exchange amount between the first indoor heat exchanger and the second indoor heat exchanger;

[0013] The outdoor unit comprises:

[0014] Outdoor housing;

[0015] a compressor, an outdoor heat exchanger and a first expansion valve disposed in the outdoor housing, the outdoor heat exchanger operating as a condenser in a first mode;

[0016] The outdoor fan rotates to allow outdoor air to enter the outdoor housing, and the outdoor air exchanges heat with the outdoor heat exchanger before flowing out of the outdoor housing;

[0017] Air conditioning further includes:

[0018] A refrigerant circulation loop is formed by the refrigerant circulating in sequence through the compressor, the outdoor heat exchanger, the first expansion valve, the first indoor heat exchanger, the second expansion valve and the second indoor heat exchanger;

[0019] An indoor humidity detection device, which is used to detect indoor humidity;

[0020] An indoor temperature detection device, used for detecting indoor temperature;

[0021] The first inner coil temperature detection device is provided in the first indoor heat exchanger and is used to detect the inner coil temperature T of the first indoor heat exchanger. p1 ;

[0022] The second inner coil temperature detection device is provided in the second indoor heat exchanger and is used to detect the inner coil temperature T of the second indoor heat exchanger. p2 ;

[0023] The controller is configured as:

[0024] Get the indoor temperature T in , indoor humidity, set temperature T set , set humidity, first indoor heat exchanger inner plate temperature T p1 , the second indoor heat exchanger inner plate temperature T p2 ;

[0025] According to the critical values ​​of multiple temperature zones, multiple sub-modes are divided, each sub-mode has a corresponding indoor temperature range, and according to the set temperature T set Determine the current target sub-mode;

[0026] If the set humidity is lower than the indoor humidity, the judged target sub-mode is entered;

[0027] According to the inner plate temperature T of the first indoor heat exchanger p1 adjusting the opening of the first expansion valve;

[0028] According to the second indoor heat exchanger inner plate temperature T p2 Adjust the operating frequency of the compressor;

[0029] According to the indoor temperature T in , adjust the opening of the second expansion valve to in Maintain the indoor temperature range corresponding to this sub-mode.

[0030] In some embodiments of the present application, the controller is configured to divide multiple sub-modes according to multiple temperature zone critical values, including:

[0031] Subtract the indoor temperature from multiple preset sub-mode temperature values ​​to obtain multiple temperature zone critical values, and divide multiple continuous and non-overlapping temperature intervals by the multiple temperature zone critical values. Each sub-mode corresponds to a temperature interval to ensure that only one target sub-mode is determined according to the set temperature;

[0032] or,

[0033] The preset indoor temperature is subtracted from multiple preset sub-mode temperature values ​​to obtain multiple temperature zone critical values, and multiple continuous and non-overlapping temperature intervals are divided by the multiple temperature zone critical values. Each sub-mode corresponds to a temperature interval to ensure that only one target sub-mode is determined according to the set temperature.

[0034] In some embodiments of the present application, the controller is configured to, according to the indoor temperature T in , adjusting the opening of the second expansion valve, including:

[0035] If the indoor temperature T in If the indoor temperature is within the range corresponding to the sub-mode, the opening of the second expansion valve remains unchanged; if T in If the indoor temperature exceeds the range corresponding to the sub-mode, the opening of the second expansion valve is reduced; if T in If the indoor temperature is lower than the indoor temperature range corresponding to the sub-mode, the opening degree of the second expansion valve is increased.

[0036] In some embodiments of the present application, the controller is configured to, according to the inner plate temperature T p1 Adjusting the opening degree of the first expansion valve includes:

[0037] A first indoor heat exchanger inner disk temperature interval corresponding to each sub-mode is provided;

[0038] If the inner plate temperature of the first indoor heat exchanger is T p1 If the temperature of the first indoor heat exchanger is within the temperature range of the first indoor heat exchanger corresponding to the sub-mode, the opening of the first expansion valve remains unchanged; if T p1 If the opening of the first expansion valve is reduced, p1 If the temperature is lower than this range, the opening of the first expansion valve is increased.

[0039] In some embodiments of the present application, the controller is configured to, according to the inner plate temperature T p2 Adjust the operating frequency of the compressor, including:

[0040] If the inner plate temperature of the second indoor heat exchanger is T p2 Within the dew point temperature range, the operating frequency of the compressor remains unchanged; if T p2 If the dew point temperature exceeds the range, the operating frequency of the compressor will be increased; if T p2 If the dew point temperature is lower than this range, the operating frequency of the compressor will be reduced.

[0041] In some embodiments of the present application, the controller is configured to adjust the speed of the indoor fan according to the indoor humidity:

[0042] The indoor humidity range is from d1 to d2, where the difference between d1 and d2 and the indoor humidity is a fixed preset value;

[0043] If the indoor humidity does not reach d1, the indoor fan runs at the first speed;

[0044] If the indoor humidity is within the indoor humidity range, the indoor fan operates at the second speed;

[0045] If the indoor humidity exceeds d2, the indoor fan runs at the third speed.

[0046] In some embodiments of the present application, the controller is configured such that the sub-modes include a fourth sub-mode having a corresponding indoor temperature interval;

[0047] If the set humidity is lower than the indoor humidity, the fourth sub-mode is entered;

[0048] adjusting the opening of the first expansion valve according to the inner disk temperature of the first indoor heat exchanger;

[0049] adjusting the operating frequency of the compressor according to the inner disk temperature of the second indoor heat exchanger;

[0050] According to the indoor temperature T in , adjust the speed of the outdoor fan.

[0051] In some embodiments of the present application, the controller is configured to, according to the indoor temperature T in , adjust the speed of the outdoor fan, including:

[0052] If the indoor temperature T in In the indoor temperature range corresponding to the fourth sub-mode, the outdoor fan speed remains unchanged; if T in If the indoor temperature exceeds this range, the speed of the outdoor fan will be increased; if T in If the indoor temperature is lower than this range, the speed of the outdoor fan will be reduced.

[0053] In some embodiments of the present application, the controller is configured to adjust the opening of the first expansion valve according to the inner disk temperature of the first indoor heat exchanger, and adjust the operating frequency of the compressor according to the inner disk temperature of the second indoor heat exchanger, including:

[0054] If the inner plate temperature of the first indoor heat exchanger is T p1 If the dew point temperature is within the range, the opening of the first expansion valve remains unchanged; if T p1 If the dew point temperature exceeds the range, the opening of the first expansion valve is reduced; if T p1 If the temperature is lower than the dew point range, the opening of the first expansion valve is increased;

[0055] If the inner plate temperature of the second indoor heat exchanger is T p2 Within the dew point temperature range, the operating frequency of the compressor remains unchanged; if T p2 If the dew point temperature exceeds the range, the operating frequency of the compressor will be increased; if T p2 If the dew point temperature is lower than this range, the operating frequency of the compressor will be reduced.

[0056] The present application also provides another air conditioner, including:

[0057] The indoor unit comprises:

[0058] Indoor shell;

[0059] A first indoor heat exchanger is disposed in the indoor housing, and the first indoor heat exchanger operates as a condenser in a first mode;

[0060] A second indoor heat exchanger is disposed in the indoor shell, and the second indoor heat exchanger operates as an evaporator in the first mode; the pipe diameter of the second indoor heat exchanger is smaller than the pipe diameter of the first indoor heat exchanger;

[0061] The second expansion valve is disposed between the first indoor heat exchanger and the second indoor heat exchanger, and adjusts the refrigerant flow between the first indoor heat exchanger and the second indoor heat exchanger by adjusting its opening degree, so as to adjust the heat exchange amount between the first indoor heat exchanger and the second indoor heat exchanger;

[0062] The outdoor unit comprises:

[0063] Outdoor housing;

[0064] a compressor, an outdoor heat exchanger and a first expansion valve disposed in the outdoor housing, the outdoor heat exchanger operating as a condenser in a first mode;

[0065] The outdoor fan rotates to allow outdoor air to enter the outdoor housing, and the outdoor air exchanges heat with the outdoor heat exchanger before flowing out of the outdoor housing;

[0066] Air conditioning further includes:

[0067] A refrigerant circulation loop is formed by the refrigerant circulating in sequence through the compressor, the outdoor heat exchanger, the first expansion valve, the first indoor heat exchanger, the second expansion valve and the second indoor heat exchanger;

[0068] An indoor humidity detection device, which is used to detect indoor humidity;

[0069] An indoor temperature detection device, used for detecting indoor temperature;

[0070] The first inner coil temperature detection device is provided in the first indoor heat exchanger and is used to detect the inner coil temperature T of the first indoor heat exchanger. p1 ;

[0071] The second inner coil temperature detection device is provided in the second indoor heat exchanger and is used to detect the inner coil temperature T of the second indoor heat exchanger. p2 ;

[0072] The controller is configured as:

[0073] Get the indoor temperature T in , indoor humidity, set temperature T set , set humidity, first indoor heat exchanger inner plate temperature T p1 , the second indoor heat exchanger inner plate temperature T p2 ;

[0074] According to the set temperature T set With indoor temperature T in , determining the target sub-mode in the first mode;

[0075] Including the first sub-mode, the second sub-mode, and the third sub-mode, when T in1 <T set ≤ Tin2 When T in2 <T set ≤T in When T in <T set ≤T in3 When it is judged as the third sub-mode, T in1 , T in2 , T in3 With indoor temperature T in The difference is a fixed preset value; each target sub-mode has a corresponding indoor temperature range;

[0076] If the set humidity is lower than the indoor humidity, the judged target sub-mode is entered;

[0077] According to the inner plate temperature T of the first indoor heat exchanger p1 adjusting the opening of the first expansion valve;

[0078] According to the second indoor heat exchanger inner plate temperature T p2 Adjust the operating frequency of the compressor;

[0079] According to the indoor temperature T in， Adjust the opening of the second expansion valve to in Maintain the indoor temperature range corresponding to this sub-mode.

[0080] In the above embodiments, the present application proposes an air conditioner, which includes a first indoor heat exchanger and a second indoor heat exchanger arranged in an indoor unit, a second expansion valve arranged between the first indoor heat exchanger and the second indoor heat exchanger, an outdoor heat exchanger and a first expansion valve arranged in an outdoor unit, an indoor humidity detection device for detecting indoor ambient humidity, an indoor temperature detection device for detecting indoor ambient temperature, and a first inner coil temperature detection device and a second inner coil temperature detection device for detecting the inner coil temperatures of the two indoor heat exchangers. The controller is configured to judge a target sub-mode according to a relationship between a set temperature and the indoor ambient temperature, and enter the judged target sub-mode control when the set humidity is lower than the indoor ambient humidity to achieve precise regulation.

[0081] Each target sub-mode is set with a corresponding indoor ambient temperature range. During the adjustment process, the first expansion valve opening is adjusted by the inner disk temperature of the first indoor heat exchanger, the compressor operating frequency is adjusted by the inner disk temperature of the second indoor heat exchanger, and then the second expansion valve opening is adjusted according to the indoor ambient temperature to maintain the indoor ambient temperature within the corresponding indoor ambient temperature range. Through the setting of multiple target sub-modes, at least a multi-stage temperature control dehumidification effect of reheating, no cooling, slight cooling and cooling can be achieved in the dehumidification mode, while reducing the room humidity, the thermal comfort of the user is also considered to meet the user's usage needs in different hot and humid environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0083] Figure 1 is a schematic structural diagram of an air conditioner provided according to an exemplary embodiment;

[0084] Figure 2 is a hardware configuration diagram of an air conditioner according to an exemplary embodiment;

[0085] Figure 3A hardware configuration block diagram of a controller provided according to an exemplary embodiment;

[0086] Figure 4 is a schematic diagram of an air conditioning system according to an exemplary embodiment;

[0087] Figure 5 is a schematic diagram of an air conditioning and heating system according to an exemplary embodiment;

[0088] Figure 6 is a hardware configuration diagram of an air conditioner in another exemplary embodiment;

[0089] Figure 7 A control logic for performing multi-stage dehumidification of an air conditioner according to an exemplary embodiment;

[0090] Figure 8 The control logic of the air conditioner in one embodiment adjusting the opening of the second expansion valve according to the indoor temperature;

[0091] Fig. 9 The control logic of the air conditioner in one embodiment adjusting the opening of the first expansion valve according to the inner disk temperature of the first indoor heat exchanger;

[0092] Fig.10 The control logic of the air conditioner in one embodiment adjusting the compressor frequency according to the inner disk temperature of the second indoor heat exchanger;

[0093] Fig.11 A control logic for implementing variable speed dehumidification for an air conditioner in one embodiment;

[0094] Fig.12 is the control logic of the air conditioner in the fourth sub-mode in one embodiment;

[0095] Fig.13 The logic of entry conditions of different sub-modes of the air conditioner in one embodiment;

[0096] Fig.14 Enthalpy-humidity diagram of an air-conditioning sub-mode in one embodiment to achieve a slight cooling and dehumidification effect;

[0097] Fig.15 The psychrometric diagram of an air conditioning sub-mode in one embodiment to achieve a dehumidification effect without cooling;

[0098] Fig.16 The psychrometric diagram of the air conditioning sub-mode in one embodiment to achieve the reheating and dehumidification effect;

[0099] Fig.17 It is a pipe diameter structure diagram of the first indoor heat exchanger and the second indoor heat exchanger of the air conditioner in one embodiment;

[0100] In the above figures:

[0101] Air conditioner 100; control device 200; outdoor unit 112; indoor unit 111;

[0102] First indoor heat exchanger 1; first inner coil temperature detection device 2; indoor fan 3; second expansion valve 4; indoor humidity detection device 5; indoor temperature detection device 6; second indoor heat exchanger 7; second inner coil temperature detection device 8; four-way valve 9; compressor 10; outdoor heat exchanger 11; outdoor fan 12; outdoor heat exchanger coil temperature detection device 13; first expansion valve 14;

[0103] Controller 21; processor 213; memory 212; communication interface 214; bus 211. DETAILED DESCRIPTION

[0104] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0105] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0106] The terms "first", "second" are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first", "second" may explicitly or implicitly include one or more of the features.

[0107] 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 can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0108] The present application embodiment provides an air conditioner 100, referring to Figure 1 The air conditioner 100 includes a refrigeration system for exchanging heat with indoor air to achieve cooling, heating or dehumidification requirements. In the dehumidification mode, the air conditioner 100 is provided with multiple sub-modes to meet different usage requirements.

[0109] The air conditioner 100 in the present application includes an indoor unit 111 and an outdoor unit 112. The indoor unit 111 and the outdoor unit 112 can be configured as an integrated unit or a split unit. The indoor unit 111 can be configured as a wall-mounted unit, a ceiling unit, a duct unit, etc.

[0110] Reference Figure 1 Taking an indoor wall mounted unit as an example, the indoor wall mounted unit is usually installed at a location such as an indoor wall. For another example, an indoor cabinet unit (not shown in the figure) is also a form of the indoor unit 111 .

[0111] Taking a split unit as an example, the air conditioner 100 includes an indoor unit 111 and an outdoor unit 112, wherein the outdoor unit 112 is usually arranged outdoors for heat exchange in the indoor environment.

[0112] In some embodiments, the indoor unit 111 includes a return air inlet and an air outlet connected to the indoor room. The indoor air enters the indoor unit 111 through the return air inlet and flows back to the indoor room through the air outlet.

[0113] In some embodiments, an air guide plate is provided at the position of the air outlet, and the air guide plate adjusts the outflow direction of the air flowing through the air outlet by changing the relative rotation angle between the air guide plate and the air outlet.

[0114] In the present application, the air conditioner 100 performs a refrigeration cycle in the air conditioner 100 through a refrigerant circulation loop. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

[0115] like Figure 4 As shown, the refrigerant circulation circuit includes a compressor 10, a four-way valve 9, an outdoor heat exchanger 11, a first expansion valve 14, a second expansion valve 4, a first indoor heat exchanger 1, a second indoor heat exchanger 7, an indoor fan 3, and an outdoor fan 12.

[0116] The outdoor fan 12 rotates to allow outdoor wind to enter the outdoor housing, and then flows out of the outdoor housing after exchanging heat with the outdoor heat exchanger 11. The outdoor fan includes a plurality of gears for changing the speed of the outdoor wind entering and exiting the outdoor housing.

[0117] The indoor fan 3 rotates to allow indoor air to enter the indoor housing, and then flows out of the indoor housing after exchanging heat with the first indoor heat exchanger 1 and the second indoor heat exchanger 7. The indoor fan 3 includes multiple gears for changing the outlet wind speed of the air flow at the outlet.

[0118] The first expansion valve 14 is disposed between the first indoor heat exchanger 1 and the outdoor heat exchanger 11, and controls the flow rate of the refrigerant flowing therethrough by adjusting its own opening.

[0119] The second expansion valve 4 is arranged between the first indoor heat exchanger 1 and the second indoor heat exchanger 7, and adjusts the refrigerant flow between the first indoor heat exchanger 1 and the second indoor heat exchanger 7 by adjusting its own opening to adjust the heat exchange amount between the first indoor heat exchanger 1 and the second indoor heat exchanger 7.

[0120] Four-way valve 9 When the solenoid valve coil is in the power-off state, the pilot slide valve moves left under the drive of the right compression spring, and the high-pressure gas enters the capillary tube and then enters the right end piston chamber. On the other hand, the gas in the left end piston chamber is discharged. Due to the pressure difference at both ends of the piston, the piston and the main slide valve move left, so that the exhaust pipe is connected to the outdoor unit connecting pipe, and the other two connecting pipes are connected, forming a refrigeration cycle.

[0121] The compressor 10 compresses the refrigerant gas in 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 refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0122] The evaporator can achieve a refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner 100 can adjust the temperature of the indoor space.

[0123] In the cooling mode, the first indoor heat exchanger 1 and the second indoor heat exchanger 7 are used as evaporators, and the outdoor heat exchanger 11 is used as a condenser.

[0124] When the cooling mode is running, the second expansion valve 4 is fully opened, and the refrigerant is discharged from the compressor 10 and enters the outdoor heat exchanger 11 to condense into a supercooled liquid. Then, it enters the first expansion valve 14 and enters the first indoor heat exchanger 1 and the second indoor heat exchanger 7 to absorb heat and vaporize the liquid refrigerant into a gaseous refrigerant. Then, it enters the compressor 10 through the four-way valve 9 to complete the refrigerant cycle.

[0125] In addition, if Figure 2 and Figure 6 As shown in the figure, the air conditioner 100 is provided with a controller 21 to control the operation of various components in the air conditioner 100 so that the various components of the air conditioner 100 can be operated to realize various predetermined functions of the air conditioner 100. Among them, the air conditioner 100 is also provided with a control device 200. Exemplarily, the control device 200 is specifically configured as a remote controller, which has the function of communicating with the controller 21 using infrared or other communication methods, for example. The remote controller is used for the user to perform various controls on the air conditioner 100 and realize the interaction between the user and the air conditioner 100.

[0126] In the embodiment shown in the present application, the controller 21 refers to a device that can generate an operation control signal according to the instruction operation code and the timing signal to instruct the air conditioner 100 to execute the control instruction. For example, in response to a power-on or power-off instruction received from a user, the controller 21 can execute an operation related to the object selected by the power-on or power-off instruction.

[0127] The present application also provides a hardware structure diagram of a controller 21, such as Figure 3 As shown, the controller 21 includes a processor 213, and optionally, further includes a memory 212 and a communication interface 214 connected to the processor 213. The processor 213, the memory 212 and the communication interface 214 are connected via a bus 211.

[0128] The processor 213 may be a central processing unit (CPU), a general-purpose network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 213 may also be any other device having a processing function, such as a circuit, a device, or a software module. The processor 213 may also include multiple CPUs, and the processor 213 may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. The processor 213 here may refer to one or more devices, circuits, or processing cores for processing data (such as computer program instructions).

[0129] The memory 212 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, or an electrically erasable programmable read-only memory 82 (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of an instruction or data structure and can be accessed by a computer, and the present embodiment of the application does not impose any restrictions on this. The memory 212 may exist independently or be integrated with the processor 213. Among them, the memory 212 may contain a computer program code. The processor 213 is used to execute the computer program code stored in the memory 212, so as to realize the control method of the multi-split air conditioning system provided in the embodiment of the present application.

[0130] The communication interface 214 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.), and the communication interface 214 can be a module, a circuit, a transceiver or any device that can achieve communication.

[0131] The bus 211 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus 211 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 3 Although only one thick line is used in the figure, it does not mean that there is only one bus 211 or only one type of bus 211.

[0132] like Figure 5As shown, the air conditioner 100 can achieve a heating function through a refrigerant circulation loop. During heating operation, the second expansion valve 4 is fully opened, and the refrigerant is discharged from the compressor 10 and enters the second indoor heat exchanger 7 and the first indoor heat exchanger 1 through the four-way valve 9 to condense into a supercooled liquid. Then, the refrigerant enters the first expansion valve 14 and then enters the outdoor heat exchanger 11 to absorb heat from the liquid refrigerant and vaporize it into a gaseous refrigerant. Then, the refrigerant enters the compressor 10 to complete the heating cycle. The dehumidification mode is not involved in the heating cycle.

[0133] To improve the reaction speed and adaptability, in some implementations of the present embodiment, the first expansion valve 14 and the second expansion valve 4 are electronic expansion valves, which use electrical signals to control the voltage or current applied to the expansion valves, thereby adjusting the liquid supply.

[0134] In some implementations of this embodiment, the electronic expansion valve may be controlled by DSH (Discharge SuperHeat, exhaust gas superheat). In addition, the electronic expansion valve may also be opened by exhaust gas temperature control, suction superheat control, etc.

[0135] In some implementations of this embodiment, the electronic expansion valve adopts DSH control (Discharge SuperHeat, exhaust superheat). The exhaust superheat is the temperature difference between the temperature of the compressor exhaust pipe or the condenser inlet and the saturation temperature corresponding to the actual condensing pressure, which means that the current actual temperature is a few degrees higher than the saturation temperature corresponding to the actual pressure.

[0136] In a semi-closed or fully closed compressor system, the electronic expansion valve can be set not only at the condenser inlet, but also at the compressor exhaust pipe, and the corresponding adjustment measures can be taken according to the change rate of superheat. That is, when the exhaust superheat is lower than the set value, the opening of the electronic expansion valve increases; when the exhaust superheat is higher than the set value, the opening of the electronic expansion valve decreases.

[0137] In this embodiment, the air conditioner 100 further includes an indoor temperature detection device 6 for detecting the indoor temperature so that the controller 21 can determine the target sub-mode in the first mode. Specifically, it can be set at the return air outlet or the front cover of the indoor unit windshield. It is electrically connected to the controller 21 and sends the indoor ambient temperature to the controller 21.

[0138] In this embodiment, the air conditioner 100 further includes an indoor humidity detection device 5 for detecting the indoor environmental humidity so that the controller 21 can determine whether to enter the target sub-mode in the first mode. The device is electrically connected to the controller 21 and sends the indoor environmental humidity to the controller 21.

[0139] In this embodiment, the air conditioner 100 also includes a first internal disk temperature detection device 2 and a second internal disk temperature detection device 8, which are respectively used to detect the internal disk temperature of the first indoor heat exchanger and the internal disk temperature of the second indoor heat exchanger, which are respectively electrically connected to the controller 21 and send the internal disk temperature of the corresponding position to the controller 21.

[0140] Exemplarily, the indoor temperature detection device 6, the first inner disk temperature detection device 2 and the second inner disk temperature detection device 8 can be set as temperature sensors, which detect the temperature value of a certain position at a certain moment and send the detected temperature value to the controller 21.

[0141] Exemplarily, the indoor humidity detection device 5 can be configured as a humidity sensor, which detects the humidity value at a certain position at a certain moment and sends the detected humidity value to the controller 21 .

[0142] In some embodiments, the air conditioner 100 also includes an outdoor heat exchanger coil temperature detection device 13 arranged at the outdoor heat exchanger 11, which is electrically connected to the controller 21 and sends the detected outdoor heat exchanger coil temperature to the controller 21 to detect the condensation temperature or evaporation temperature there, so that the controller 21 can send corresponding adjustment instructions.

[0143] In the present application, the user can use the control device 200 to turn on the first mode of the air conditioner 100, namely the dehumidification mode. In the dehumidification mode, multiple sub-modes are provided, corresponding to different relationships between set temperatures and indoor temperatures, to meet the user's various usage requirements.

[0144] Multiple sub-modes are divided by multiple different temperature zone critical values, each sub-mode has a corresponding temperature range, and the target sub-mode is determined according to which temperature range the set temperature value falls in. Then, according to the heat and humidity load of the room, the second expansion valve 4 is controlled to adjust the condensation temperature and evaporation temperature of the first indoor heat exchanger 1 and the second indoor heat exchanger 7 respectively to achieve a multi-stage dehumidification effect.

[0145] In some embodiments, the indoor temperature is subtracted from a plurality of preset sub-mode temperature values ​​to obtain a plurality of temperature zone critical values, and a plurality of continuous and non-overlapping temperature intervals are divided by the plurality of temperature zone critical values, and each sub-mode corresponds to a temperature interval, so as to ensure that only one target sub-mode is determined according to the set temperature;

[0146] or,

[0147] The preset indoor temperature is subtracted from multiple preset sub-mode temperature values ​​to obtain multiple temperature zone critical values, and multiple continuous and non-overlapping temperature intervals are divided by the multiple temperature zone critical values. Each sub-mode corresponds to a temperature interval to ensure that only one target sub-mode is determined according to the set temperature.

[0148] Exemplarily, the sub-mode temperature values ​​can be 1°C, 2°C, and -2°C. When the indoor temperature is 24°C, the sub-mode temperature values ​​are subtracted to obtain the temperature zone critical values ​​of 22°C, 23°C, and 26°C, respectively. The air conditioner 100 includes a first sub-mode of 22-23°C, a second sub-mode of 23-24°C, and a third sub-mode of 24-26°C. If the set temperature is 25°C, the target sub-mode is judged to be the third sub-mode.

[0149] It should be noted that the preset indoor temperature is set according to the suitable ambient temperature for the human body, so that the setting of the temperature zone threshold value is more in line with the needs of the user. For example, the preset indoor temperature is set to 25°C or 26°C, which can of course be adjusted according to the user's settings.

[0150] It can be known that the corresponding sub-mode temperature values ​​when the temperature zone critical value is calculated using the detected indoor temperature and the temperature zone critical value is calculated using the preset indoor temperature can be the same or different.

[0151] In some embodiments, the detected indoor temperature may be temperature compensated and then the temperature zone threshold value may be calculated by subtracting the detected indoor temperature from the corresponding preset sub-mode temperature value to obtain a temperature closer to the average indoor temperature, thereby improving the user experience. For example, temperature compensation may be performed based on the outlet air temperature or the coil temperature.

[0152] Exemplarily, the sub-mode includes a first sub-mode, a second sub-mode, a third sub-mode, and a reference Figure 7 , illustrating the control logic of multi-stage dehumidification in the embodiment of the present application.

[0153] Measure the indoor temperature T in , indoor humidity, the inner disk temperature of the first indoor heat exchanger, the inner disk temperature of the second indoor heat exchanger, and obtain the set temperature T set , setting humidity (step S701);

[0154] According to the set temperature T set With indoor temperature T in , determining a target sub-mode in the first mode (step S702);

[0155] There are three target sub-modes divided by the critical values ​​of each temperature zone. in1 <T set ≤T in2 When T in2 <T set ≤T in When T in <T set ≤T in3 When it is judged as the third sub-mode, T in1 , Tin2 , T in3 With indoor temperature T in The difference is the preset sub-mode temperature value; each mode has a corresponding indoor ambient temperature range.

[0156] For example, T in1 2℃ lower than indoor temperature, T in2 1℃ lower than indoor temperature, T in3 2℃ higher than the indoor temperature. For example, when the indoor temperature is 24℃, T in1 At 22°C, T in2 At 23°C, T in3 is 26℃. At this time, when the set temperature T set When the temperature is between 22°C and 23°C, it is determined as the first sub-mode, when the set temperature is between 23°C and 24°C, it is determined as the second sub-mode, and when the set temperature is between 24°C and 26°C, it is determined as the third sub-mode.

[0157] After determining the target sub-mode, determine whether the set humidity is lower than the indoor humidity (step S703);

[0158] In step S703, if the set humidity is lower than the indoor humidity, the determined target sub-mode is entered (step S704);

[0159] Adjust the opening of the first expansion valve 14 according to the inner disk temperature of the first indoor heat exchanger (step S705);

[0160] According to the inner disk temperature of the second indoor heat exchanger, the operating frequency of the compressor 10 is adjusted (step S706);

[0161] According to the indoor temperature, the opening degree of the second expansion valve 4 is adjusted to maintain the indoor ambient temperature range corresponding to the sub-mode (step S707);

[0162] It should be noted that when the air conditioner is operating in the target sub-mode, the first indoor heat exchanger 1 and the outdoor heat exchanger 11 act as condensers for heating the air, and the second indoor heat exchanger 7 acts as an evaporator for cooling and dehumidifying the air. The refrigerant is discharged from the compressor 10 and enters the outdoor heat exchanger 11 and the first indoor heat exchanger 1 to condense into a supercooled liquid, and then passes through the second expansion valve 4 and enters the second indoor heat exchanger 7 to absorb heat and vaporize the liquid refrigerant into a gaseous refrigerant, and finally enters the compressor 10 through the four-way valve 9 to complete the refrigerant circulation process.

[0163] The first indoor heat exchanger 1 heats the air to compensate for the temperature drop during the dehumidification process of the second indoor heat exchanger 7, so as to adjust the indoor temperature and prevent the indoor temperature from dropping too much during the dehumidification process, thereby affecting the user experience.

[0164] In this embodiment, by setting entry conditions for multiple sub-modes to meet the usage requirements of different users and in different scenarios, the opening of the second expansion valve 4 is controlled to adjust the condensing temperature and evaporating temperature of the first indoor heat exchanger 1 and the second indoor heat exchanger 7, thereby effectively improving the user experience.

[0165] In some embodiments, in order to ensure that the indoor temperature is maintained in the corresponding target sub-mode, the present application detects the indoor temperature through the indoor temperature detection device 5, adjusts the opening of the second expansion valve 4 to control the refrigerant flow from the first indoor heat exchanger 1 to the second indoor heat exchanger 7, so as to control the cold input to the room.

[0166] In some embodiments, since the first indoor heat exchanger 1 acts as a condenser and the second indoor heat exchanger 7 acts as an evaporator, it is necessary to ensure that the first indoor heat exchanger 1 and the second indoor heat exchanger 7 maintain the condensing temperature and evaporating temperature in the corresponding target sub-mode to maintain the dehumidification function of the corresponding target sub-mode.

[0167] Therefore, the temperature detection device at the corresponding position detects the inner disk temperature of the first indoor heat exchanger, the inner disk temperature of the second indoor heat exchanger and the indoor temperature to adjust the opening of the first expansion valve 14 and the second expansion valve 4 to control the flow rate of the refrigerant at the corresponding position.

[0168] Reference Figure 8 , illustrating the control logic of adjusting the opening of the second expansion valve according to the indoor temperature in the embodiment of the present application.

[0169] Obtaining the indoor temperature and the opening degree of the second expansion valve 4 (step S801);

[0170] Determine whether the indoor temperature is within the indoor ambient temperature range corresponding to the sub-mode (step S802);

[0171] If the indoor temperature is within the indoor ambient temperature range corresponding to the sub-mode, the opening degree of the second expansion valve 4 remains unchanged (step S803);

[0172] If the indoor temperature is not within the indoor ambient temperature range corresponding to the sub-mode, then determining whether the indoor temperature exceeds the indoor ambient temperature range corresponding to the sub-mode (step S804);

[0173] If the indoor temperature exceeds the indoor ambient temperature range corresponding to the sub-mode, the opening of the second expansion valve 4 is reduced (step S805) to reduce the refrigerant flow to the second indoor heat exchanger 7;

[0174] If the indoor temperature does not exceed the indoor ambient temperature interval corresponding to the sub-mode, that is, the indoor temperature is lower than the indoor ambient temperature interval corresponding to the sub-mode, the opening of the second expansion valve 4 is increased (step S806) to increase the refrigerant flow to the second indoor heat exchanger 7;

[0175] In this embodiment, the opening degree of the second expansion valve 4 is controlled to achieve different cold inputs to the room in the corresponding sub-modes in the dehumidification mode, thereby ensuring a multi-stage dehumidification effect to meet the user's usage requirements.

[0176] It can be known that the opening degree of the second expansion valve 4 is related to the indoor temperature, that is, the opening degree range of the second expansion valve 4 is different in different sub-modes.

[0177] In some embodiments, when the opening of the second expansion valve increases, the refrigerant flow rate in the first indoor heat exchanger decreases, and the refrigerant flow rate in the second indoor heat exchanger increases, so that the indoor temperature drop increases during the dehumidification process. Similarly, when the opening of the second expansion valve decreases, the refrigerant flow rate in the first indoor heat exchanger increases, and the refrigerant flow rate in the second indoor heat exchanger decreases, so that the indoor temperature drop value during the dehumidification process decreases.

[0178] On this basis, in the first sub-mode, the second sub-mode and the third sub-mode, the opening range of the second expansion valve 4 is gradually reduced.

[0179] Exemplarily, when the indoor temperature is 24°C, the air conditioner 100 includes a first sub-mode of 22°C to 23°C, a second sub-mode of 23°C to 24°C, and a third sub-mode of 24°C to 26°C, and the opening range of the second expansion valve 4 decreases with the sub-mode temperature range.

[0180] In some embodiments, since the first indoor heat exchanger 1 acts as a condenser in the target sub-mode of the dehumidification mode, it is necessary to ensure that the condensation temperature there is maintained within the corresponding range. The present application sets a first inner disk temperature detection device 2 to detect the inner disk temperature of the first indoor heat exchanger to adjust the opening of the first expansion valve 14 to control the refrigerant flow from the outdoor heat exchanger 11 to the first indoor heat exchanger 1.

[0181] refer to Fig. 9 , illustrating the control logic of adjusting the opening of the first expansion valve 14 according to the inner disk temperature of the first indoor heat exchanger in the embodiment of the present application.

[0182] Obtain the inner disk temperature of the first indoor heat exchanger and the opening degree of the first expansion valve 14 (step S901);

[0183] Determine whether the inner disk temperature of the first indoor heat exchanger is within the inner disk temperature range of the first indoor heat exchanger corresponding to the sub-mode (step S902);

[0184] If the inner disk temperature of the first indoor heat exchanger is within the inner disk temperature range of the first indoor heat exchanger corresponding to the sub-mode, the opening degree of the first expansion valve 14 remains unchanged (step S903);

[0185] If the first indoor heat exchanger inner disk temperature is not within the first indoor heat exchanger inner disk temperature range corresponding to the sub-mode, determine whether the first indoor heat exchanger inner disk temperature exceeds the first indoor heat exchanger inner disk temperature range corresponding to the sub-mode (step S904);

[0186] If the inner disk temperature of the first indoor heat exchanger exceeds the inner disk temperature range of the first indoor heat exchanger corresponding to the sub-mode, the opening of the first expansion valve 14 is reduced (step S905) to reduce the refrigerant flow to the first indoor heat exchanger 1;

[0187] If the inner disk temperature of the first indoor heat exchanger does not exceed the inner disk temperature range of the first indoor heat exchanger corresponding to the sub-mode, that is, the inner disk temperature of the first indoor heat exchanger is lower than the corresponding temperature range, the opening of the first expansion valve 14 is increased (step S906) to increase the refrigerant flow to the first indoor heat exchanger 1;

[0188] In this embodiment, the opening degree of the first expansion valve 14 is controlled to control the refrigerant flow to the first indoor heat exchanger 1 in the corresponding target sub-mode to ensure the condensing temperature of the first indoor heat exchanger 1, thereby ensuring the multi-stage dehumidification effect to meet the user's usage requirements.

[0189] In some embodiments, since the second indoor heat exchanger 7 acts as an evaporator in the target sub-mode of the dehumidification mode, it is necessary to ensure that the evaporation temperature there is maintained within the corresponding range. The present application detects the inner disk temperature of the second indoor heat exchanger by setting a second inner disk temperature detection device 8 to adjust the frequency of the compressor 10 to ensure the input of cold air into the room.

[0190] The dew point temperature is the temperature at which the air is cooled to saturation while the water vapor content in the air remains unchanged and the air pressure remains constant, that is, the temperature at which water vapor turns into dew drops. When the water vapor in the air has reached saturation, the air temperature is the same as the dew point temperature; when the water vapor has not reached saturation, the air temperature is higher than the dew point temperature. The dehumidification process of the air conditioner can condense the moisture in the air into water droplets by lowering the temperature, that is, after the indoor air enters the air conditioner, it is heated in the evaporator and the humidity is reduced, and it is cooled in the condenser and the moisture condenses into water droplets and is discharged outdoors.

[0191] In this embodiment, when in the sub-mode of the dehumidification mode, the second indoor heat exchanger 7 acts as an evaporator, and the temperature there needs to reach the dew point temperature under the current indoor air to ensure the dehumidification process. In some practical cases, the dew point temperature is a range value, and the compressor frequency is adjusted to ensure that the temperature at the second indoor heat exchanger 7 falls within the dew point temperature range there. The temperature of the second indoor heat exchanger 7 is detected by the second inner disk temperature detection device 8.

[0192] refer to Fig.10 , illustrating the control logic of adjusting the operating frequency of the compressor 10 according to the inner disk temperature of the second indoor heat exchanger in the embodiment of the present application.

[0193] Obtain the inner disk temperature of the second indoor heat exchanger and the operating frequency of the compressor 10 (step S1001);

[0194] Determine whether the inner disk temperature of the second indoor heat exchanger is within the dew point temperature range (step S1002);

[0195] If the inner disk temperature of the second indoor heat exchanger is within the dew point range, the operating frequency of the compressor 10 remains unchanged (step S1003);

[0196] If the inner disk temperature of the second indoor heat exchanger is not within the dew point range, then determine whether the inner disk temperature of the second indoor heat exchanger exceeds the dew point temperature range (step S1004);

[0197] If the inner disk temperature of the second indoor heat exchanger exceeds the dew point temperature range, the operating frequency of the compressor 10 is increased (step S1005);

[0198] If the inner disk temperature of the second indoor heat exchanger does not exceed the dew point temperature range, that is, the inner disk temperature of the second indoor heat exchanger is lower than the dew point temperature, the operating frequency of the compressor 10 is reduced (step S1006);

[0199] It is known that the dew point temperature can be calculated using the Goff-Gratch formula, or measured by looking up the dew point temperature at different air pressures or using a dew point hygrometer.

[0200] In this embodiment, the operating frequency of the compressor 10 is adjusted by comparing whether the temperature of the second indoor heat exchanger 7 falls within the dew point temperature range to control the cold input, thereby ensuring the effect of multi-stage dehumidification.

[0201] In some embodiments, in order to make the indoor humidity reach the set humidity at different rates, the present application detects the indoor humidity and compares it with a preset value to control the rotation speed of the indoor fan 3, thereby achieving dehumidification effects at different rates.

[0202] It can be known that the indoor fan includes multiple rotational speeds. Exemplarily, the indoor fan is provided with three rotational speeds, namely a first rotational speed, a second rotational speed and a third rotational speed which increase in sequence.

[0203] refer to Fig.11 , illustrating the control logic of variable speed dehumidification in the embodiment of the present application.

[0204] Obtain indoor humidity and indoor fan 3 speed (step S1101);

[0205] Determine whether the indoor humidity is within the range of d1 to d2 (step S1102);

[0206] If the indoor humidity is within the range of d1 to d2, the indoor fan 3 operates at the second speed (step S1103);

[0207] If the indoor humidity is not within the range of d1 to d2, it is determined whether the indoor humidity exceeds d2 (step S1104);

[0208] If the indoor humidity exceeds d2, the indoor fan 3 operates at the third speed (step S1105);

[0209] If the indoor humidity does not exceed d2, that is, is lower than d1, the indoor fan 3 operates at the first speed (step S1106);

[0210] In this embodiment, the speed of the indoor fan 3 is controlled to adjust the wind speed of delivering cold air to the room, so as to achieve three processes: rapid dehumidification, stable dehumidification and micro dehumidification. Of course, different speed controls of the indoor fan 3 can also be achieved by setting different humidity ranges to achieve precise control of the indoor humidity.

[0211] It should be noted that micro-dehumidification, stable dehumidification and fast dehumidification are three modes in which the dehumidification speed of the air conditioner 100 increases from slow to fast in the process of reaching the set humidity, corresponding to the first speed, the second speed and the third speed of the indoor fan 3 respectively.

[0212] In some embodiments, the target sub-mode in the first mode of the air conditioner 100 further includes a fourth sub-mode. In the fourth sub-mode, the operating principle of the air conditioner 100 is consistent with the cooling mode. At this time, the outdoor heat exchanger 11 is used as a condenser, and the first indoor heat exchanger 1 and the second indoor heat exchanger 7 are used as evaporators. Therefore, when judging the inner disk temperature of the first indoor heat exchanger and the inner disk temperature of the second indoor heat exchanger, they are compared with the dew point temperature at that location to ensure that the evaporation temperature is within the corresponding range to achieve a dehumidification effect.

[0213] refer to Fig.12 , illustrating the control logic in the fourth sub-mode in an embodiment of the present application.

[0214] Measure the indoor temperature, indoor humidity, the inner disk temperature of the first indoor heat exchanger, and the inner disk temperature of the second indoor heat exchanger, and obtain the set temperature and set humidity (step S1201);

[0215] Determine the target sub-mode in the first mode according to the relationship between the set temperature and the indoor temperature (step S1202);

[0216] When T set ≤T in1 When it is judged as the fourth sub-mode;

[0217] After determining the fourth sub-mode, determining whether the set humidity is lower than the indoor humidity (step S1203);

[0218] If the set humidity is lower than the indoor humidity, the fourth sub-mode is entered (step S1204);

[0219] Adjust the opening of the first expansion valve 14 according to the inner disk temperature of the first indoor heat exchanger (step S1205);

[0220] Specifically, if the inner disk temperature of the first indoor heat exchanger is within the dew point temperature range, the opening of the first expansion valve 14 remains unchanged; if the inner disk temperature of the first indoor heat exchanger exceeds the dew point temperature range, the opening of the first expansion valve 14 is reduced; if the inner disk temperature of the first indoor heat exchanger is lower than the dew point temperature range, the opening of the first expansion valve 14 is increased.

[0221] Adjusting the operating frequency of the compressor 10 according to the inner disk temperature of the second indoor heat exchanger (step S1206);

[0222] Specifically, if the inner disk temperature of the second indoor heat exchanger is within the dew point temperature range, the operating frequency of the compressor 10 remains unchanged; if the inner disk temperature of the second indoor heat exchanger exceeds the dew point temperature range, the operating frequency of the compressor 10 is increased; if the inner disk temperature of the second indoor heat exchanger is lower than the dew point temperature range, the operating frequency of the compressor 10 is reduced;

[0223] According to the indoor temperature, the speed of the outdoor fan 12 is adjusted (step S1207);

[0224] Specifically, if the indoor temperature is within the indoor temperature range corresponding to the fourth sub-mode, the speed of the outdoor fan 12 remains unchanged; if the indoor temperature exceeds the indoor temperature range, the speed of the outdoor fan 12 is increased; if the indoor temperature is lower than the indoor temperature range, the speed of the outdoor fan 12 is reduced.

[0225] In some embodiments, a fixed time interval is also provided to achieve automatic control.

[0226] The adjustment action performed according to the temperature of the inner plate of the first indoor heat exchanger is performed once every t1s;

[0227] The adjustment action is performed according to the temperature of the inner plate of the second indoor heat exchanger, and is performed every t2s;

[0228] The adjustment action based on the indoor humidity is performed every t3s;

[0229] The adjustment action according to the indoor temperature is performed every t4s;

[0230] Among them, t1, t2, t3, and t4 are the same or different natural numbers.

[0231] Specifically, in the first sub-mode, the second sub-mode and the third sub-mode, the opening of the first expansion valve 14 is adjusted according to the inner disk temperature of the first indoor heat exchanger every t1s, that is, a Fig. 9 The corresponding control logic; every t2s, the operating frequency of the compressor 10 is adjusted according to the temperature of the inner disk of the second indoor heat exchanger, that is, it is executed once Fig.10 The corresponding control logic; every t3s, the speed of the indoor fan 3 is adjusted according to the indoor humidity, that is, it is executed once Fig.11 The corresponding control logic; every t4s, according to the indoor temperature T in Adjust the opening of the second expansion valve 4, that is, perform a Figure 8 The corresponding control logic.

[0232] In the fourth sub-mode, the opening of the first expansion valve 14 is adjusted once every t1s according to the inner disk temperature of the first indoor heat exchanger; the operating frequency of the compressor 10 is adjusted once every t2s according to the inner disk temperature of the second indoor heat exchanger; the speed of the indoor fan 3 is adjusted once every t3s according to the indoor humidity; and the speed of the outdoor fan 12 is adjusted once every t4s according to the indoor temperature.

[0233] An embodiment is provided below to describe in detail the sub-modes of the air conditioner 100 provided in the present application and the corresponding control logic.

[0234] Among them, the first sub-mode can be a slight cooling dehumidification mode, the second sub-mode can be a non-cooling dehumidification mode, the third sub-mode can be a reheating dehumidification mode, and the fourth sub-mode can be a cooling dehumidification mode.

[0235] The difference between the micro-cooling dehumidification mode and the cooling dehumidification mode, in terms of temperature, lies in the amount of cooling during the dehumidification process. In terms of working principle, the working states of the first indoor heat exchanger and the second indoor heat exchanger in the micro-cooling dehumidification mode are different from those of the first indoor heat exchanger and the second indoor heat exchanger in the cooling dehumidification mode.

[0236] In this embodiment, each parameter can be divided into a measured value and a preset value. The measured value is the actual parameter value generated by the air conditioner 100 during operation, and the preset value is a variable parameter generated by logical operations in the controller based on the measured value or a fixed parameter preset in the control program.

[0237] Specifically, the measured values ​​are: indoor humidity d in , Indoor temperature T in , the first indoor heat exchanger inner plate temperature T p1 , the second indoor heat exchanger inner plate temperature T p2 , air dew point temperature TL (can be adjusted according to the indoor temperature T in and indoor humidity in Query), the second expansion valve opening D, compressor frequency F, set temperature T set , set humidity d0, indoor fan air volume Q0 and outdoor fan air volume Q w .

[0238] The parameters corresponding to each sub-mode are different. Specifically, the temperature range T is set in the cooling and dehumidification mode. in1 , Set the temperature range T in the micro-cooling and dehumidification mode in1 and T in2 , Set the temperature range T in the non-cooling dehumidification mode in2 and T in , Set the temperature range T in reheat dehumidification mode in and T in3 . T in1 , T in2 and T in3 The difference between the target temperature and the indoor temperature is a fixed value, that is, the specific values ​​of each target sub-mode can change with the indoor temperature. The temperature range that can be set for each target sub-mode is not the same, so as to clarify the entry conditions of each target sub-mode.

[0239] like Fig.13 As shown, the target sub-mode to be entered is determined by determining within which sub-mode the set temperature falls. set ≤T in1 Enter the cooling and dehumidification mode, T in1 <T set ≤T in2 Enter the micro-cooling and dehumidification mode, T in2 <T set ≤T in Enter the non-cooling dehumidification mode, T in <T set ≤T in3 Enters reheat dehumidification mode.

[0240] The preset values ​​are: the range of dew point temperature TL preset according to the air dew point temperature TL1 and TL2 , according to the indoor humidity d in The preset indoor humidity intervals d1 and d2, the first indoor heat exchanger inner disk temperature intervals T1 and T2 in the micro-cooling dehumidification mode, the first indoor heat exchanger inner disk temperature intervals T3 and T4 in the non-cooling dehumidification mode, the first indoor heat exchanger inner disk temperature intervals T5 and T6 in the reheat dehumidification mode, the first indoor heat exchanger inner disk temperature judgment time t1, the second indoor heat exchanger inner disk temperature judgment time t2, the indoor humidity judgment time t3, the indoor temperature judgment time t4, the indoor temperature interval T in the cooling dehumidification mode set1 and T set2 , Indoor temperature range T in micro-cooling and dehumidification mode set3 and T set4 , Indoor temperature range T in non-cooling and dehumidification mode set5 and T set6 , Indoor temperature range T in reheat dehumidification mode set7 and T set8 , the initial opening degree D of the first expansion valve 14 w0 , the maximum opening degree of the second expansion valve 4 D max , the initial opening degree D0 of the second expansion valve 4, the initial air volume Q of the indoor fan n0 , Outdoor fan initial air volume Q w0 , the initial frequency F0 of compressor 10.

[0241] (1) Cooling and dehumidification mode control process:

[0242] First determine the indoor humidity d in With the size of the set humidity d0, when d in ≤d0, exit and re-judge. in >d0, enter the cooling and dehumidification mode, and set the initial opening of the first expansion valve 14 to D w0 , the second expansion valve 4 is at its maximum opening degree D max The indoor and outdoor fans have initial air volumes Q n0 and Q w0 , compressor 10 is at initial frequency F0;

[0243] Determine the inner plate temperature T of the first indoor heat exchanger p1 Does the range satisfy T L1 ≤T p1 ≤T L2 If yes, the opening of the first expansion valve 14 remains unchanged. If no, it is determined whether T p1 >T L2 If yes, then reduce the opening of the first expansion valve 14, if no, then increase the opening of the first expansion valve 14; the temperature of the inner plate of the first indoor heat exchanger is judged once every t1 seconds;

[0244] Determine the inner plate temperature T of the second indoor heat exchangerp2 Does the range satisfy T L1 ≤T p2 ≤T L2 If yes, the frequency of compressor 10 remains unchanged. If no, it is determined whether T p2 >T L2 If yes, increase the frequency of compressor 10, if no, reduce the frequency of compressor 10; the temperature of the inner disk of the second indoor heat exchanger is judged once every t2 seconds;

[0245] Determine the indoor humidity in Is the range of d in ≤d1, if yes, then enter the micro dehumidification mode, indoor fan 3 is low air volume, if no, then judge the indoor humidity d in Is the range of d in ≤d2, if yes, then enter the stable dehumidification mode, the indoor fan 3 is at medium air volume, if no, then enter the fast dehumidification mode, the indoor fan 3 is at high air volume; the indoor humidity is judged once every t3 seconds;

[0246] Determine the indoor temperature T in Is the range of T set1 ≤T in ≤T set2 If so, then the outdoor fan 12 air volume Q w If not, then determine the indoor temperature T in Is the range of T in >T set2 If yes, increase the air volume Q of outdoor fan 12 w If not, reduce the air volume Q of outdoor fan 12 w ; The indoor temperature is judged once every t4 seconds;

[0247] After the control is completed, return to continue to judge the inner disk temperature and repeat the judgment.

[0248] (2) Micro-cooling and dehumidification mode control process

[0249] First determine the indoor humidity d in With the size of the set humidity d0, when d in ≤d0, exit and re-judge. in >d0, enter the slight cooling and dehumidification mode, and set the initial opening of the first expansion valve 14 to D w0 The second expansion valve 4 has an initial opening degree D0, and the indoor and outdoor fans have initial air volumes Q n0 and Q w0 , compressor 10 is at initial frequency F0;

[0250] Determine the inner plate temperature T of the first indoor heat exchanger p1 Does the range satisfy T1≤T p1≤T2, if yes, the opening of the first expansion valve 14 remains unchanged, if no, it is determined whether T p1 >T2, if yes, then reduce the opening of the first expansion valve 14, if no, then increase the opening of the first expansion valve 14; the temperature of the inner plate of the first indoor heat exchanger is judged once every t1 seconds;

[0251] Determine the inner plate temperature T of the second indoor heat exchanger p2 Does the range satisfy T L1 ≤T p2 ≤T L2 If yes, the frequency of compressor 10 remains unchanged. If no, it is determined whether T p2 >T L2 If yes, increase the frequency of compressor 10, if no, reduce the frequency of compressor 10; the temperature of the inner disk of the second indoor heat exchanger is judged once every t2 seconds;

[0252] Determine the indoor humidity in Is the range of d in ≤d1, if yes, then enter the micro dehumidification mode, indoor fan 3 is low air volume, if no, then judge the indoor humidity d in Is the range of d in ≤d2, if yes, then enter the stable dehumidification mode, the indoor fan 3 is at medium air volume, if no, then enter the fast dehumidification mode, the indoor fan 3 is at high air volume; the indoor humidity is judged once every t3 seconds;

[0253] Determine the indoor temperature T in Is the range of T set3 ≤T in ≤T set4 If yes, the opening of the second expansion valve 4 remains unchanged. If no, the indoor temperature T is determined. in Is the range of T in >T set4 If yes, then reduce the opening of the second expansion valve 4, if no, then increase the opening of the second expansion valve 4; the indoor temperature is judged once every t4 seconds;

[0254] After the control is completed, return to continue to judge the inner disk temperature and repeat the judgment.

[0255] (3) Control process of non-cooling dehumidification mode

[0256] First determine the indoor humidity d in With the size of the set humidity d0, when d in ≤d0, exit and re-judge. in >d0, enter the non-cooling dehumidification mode, and set the initial opening of the first expansion valve 14 to D w0 The second expansion valve 4 has an initial opening degree D0, and the indoor and outdoor fans have initial air volumes Q n0 and Qw0 , compressor 10 is at initial frequency F0;

[0257] Determine the inner plate temperature T of the first indoor heat exchanger p1 Does the range satisfy T3≤T p1 ≤T4, if yes, the opening of the first expansion valve 14 remains unchanged, if no, it is determined whether T p1 >T4, if yes, reduce the opening of the first expansion valve 14, if no, increase the opening of the first expansion valve 14; the temperature of the inner plate of the first indoor heat exchanger is determined once every t1 seconds;

[0258] Determine the inner plate temperature T of the second indoor heat exchanger p2 Does the range satisfy T L1 ≤T p2 ≤T L2 If yes, the frequency of compressor 10 remains unchanged. If no, it is determined whether T p2 >T L2 If yes, increase the frequency of compressor 10, if no, reduce the frequency of compressor 10; the temperature of the inner disk of the second indoor heat exchanger is judged once every t2 seconds;

[0259] Determine the indoor humidity in Is the range of d in ≤d1, if yes, then enter the micro dehumidification mode, indoor fan 3 is low air volume, if no, then judge the indoor humidity d in Is the range of d in ≤d2, if yes, then enter the stable dehumidification mode, the indoor fan 3 is at medium air volume, if no, then enter the fast dehumidification mode, the indoor fan 3 is at high air volume; the indoor humidity is judged once every t3 seconds;

[0260] Determine the indoor temperature T in Is the range of T set5 ≤T in ≤T set6 If yes, the opening of the second expansion valve 4 remains unchanged. If no, the indoor temperature T is determined. in Is the range of T in >T set6 If yes, then reduce the opening of the second expansion valve 4, if no, then increase the opening of the second expansion valve 4; the indoor temperature is judged once every t4 seconds;

[0261] After the control is completed, return to continue to judge the inner disk temperature and repeat the judgment.

[0262] (4) Reheat dehumidification mode control process

[0263] First determine the indoor humidity d in With the size of the set humidity d0, when d in ≤d0, exit and re-judge.in >d0, enter the reheat dehumidification mode, and set the initial opening of the first expansion valve 14 to D w0 The second expansion valve 4 has an initial opening degree D0, and the indoor and outdoor fans have initial air volumes Q n0 and Q w0 , compressor 10 is at initial frequency F0;

[0264] Determine the inner plate temperature T of the first indoor heat exchanger p1 Does the range satisfy T5≤T p1 ≤T6, if yes, the opening of the first expansion valve 14 remains unchanged, if no, it is determined whether T p1 >T6, if yes, then reduce the opening of the first expansion valve 14, if no, then increase the opening of the first expansion valve 14, and judge the inner plate temperature of the first indoor heat exchanger once every t1 seconds;

[0265] Determine the inner plate temperature T of the second indoor heat exchanger p2 Does the range satisfy T L1 ≤T p2 ≤T L2 If yes, the frequency of compressor 10 remains unchanged. If no, it is determined whether T p2 >T L2 If yes, the frequency of compressor 10 is increased, if no, the frequency of compressor 10 is reduced, and the temperature of the inner disk of the second indoor heat exchanger is judged once every t2 seconds;

[0266] Determine the indoor humidity in Is the range of d in ≤d1, if yes, then enter the micro dehumidification mode, indoor fan 3 is low air volume, if no, then judge the indoor humidity d in Is the range of d in ≤d2, if yes, then enter the stable dehumidification mode, the indoor fan 3 is at medium air volume, if no, then enter the fast dehumidification mode, the indoor fan 3 is at high air volume, and the indoor humidity is judged once every t3 seconds;

[0267] Determine the indoor temperature T in Is the range of T set7 ≤T in ≤T set8 If yes, the opening of the second expansion valve 4 remains unchanged. If no, the indoor temperature T is determined. in Is the range of T in >T set8 If yes, then reduce the opening of the second expansion valve 4, if no, then increase the opening of the second expansion valve 4, and judge the indoor temperature once every t4 seconds;

[0268] After the control is completed, return to continue to judge the inner disk temperature and repeat the judgment.

[0269] It should be noted that in the above-mentioned micro-cooling dehumidification mode control process, non-cooling dehumidification mode control process and reheat dehumidification mode control process, the initial opening of the second expansion valve is set to D0, and then the opening of the second expansion valve is adjusted according to the subsequent indoor temperature.

[0270] In some embodiments, the initial opening of the second expansion valve is set to be different. Specifically, the initial opening of the micro-cooling dehumidification mode control process is D1, the initial opening of the non-cooling dehumidification mode control process is D2, and the initial opening of the reheating dehumidification mode control process is D3, wherein D1>D2>D3. The temperature is adjusted during the dehumidification process, and then the opening of the second expansion valve is further adjusted according to the subsequent indoor temperature. The temperature required by the user is reached as soon as possible to improve the user experience.

[0271] In some embodiments, the first indoor heat exchanger and the second indoor heat exchanger may be configured as two parts of the indoor heat exchanger, namely a first part indoor heat exchanger and a second part indoor heat exchanger.

[0272] like Fig.17 As shown, in some embodiments, the pipe diameters of the first indoor heat exchanger 1 and the second indoor heat exchanger 7 can be changed to improve the dehumidification effect. Specifically, the pipe diameter of the first indoor heat exchanger 1 is D1, the pipe diameter of the second indoor heat exchanger 7 is D2, and D1>D2, the second indoor heat exchanger 7 with a smaller pipe diameter has a large pressure drop, so that the pressure of the refrigerant is lower when it flows through, so as to reduce the evaporation temperature, thereby improving the dehumidification effect.

[0273] Correspondingly, when the diameters of the two parts of the indoor heat exchanger are changed, the adjustment ranges of the compressor, the first expansion valve, the second expansion valve, the indoor fan and the outdoor fan are also changed accordingly.

[0274] Combination Fig.14 , Fig.15 , Fig.16 To illustrate the dehumidification effect achieved by the air conditioner 100 provided in the present application in three sub-modes.

[0275] The enthalpy diagram is a graph that shows the relationship between various parameters of wet air. A wet air system containing a certain mass of dry air may also have a change in vapor content, which has one more degree of freedom of state change than a simple compressible system. Therefore, the state of the wet air is determined by three independent parameters.

[0276] φ is relative humidity, which refers to the ratio of the partial pressure of water vapor in the air to the partial pressure of saturated water vapor at the same temperature. That is, it indicates the degree to which the air is close to saturation. A small φ value indicates that the air is dry, far from the saturation state, and has a strong ability to absorb water vapor; a large φ value indicates that the air is humid, close to the saturation state, and has a weak ability to absorb water vapor.

[0277] The curve when φ=95% represents the target sub-mode at this time. The curve from 1 to 2 represents the dehumidification process under the target sub-mode, and 3 is the temperature change of the heating process. The heat exchange of the first indoor heat exchanger and the second indoor heat exchanger in each target sub-mode are shown in the boxed part.

[0278] like Fig.14 As shown, in the first sub-mode, the heat exchange rate of the second part of the indoor heat exchanger is lower than that of the first part of the indoor heat exchanger. Since the first part of the indoor heat exchanger acts as a condenser and the second part of the indoor heat exchanger acts as an evaporator, the cold output by the air conditioner 100 to the room slightly lowers the indoor temperature, thereby achieving a slight cooling and dehumidification effect.

[0279] like Fig.15 As shown, in the second sub-mode, the heat exchange amount of the second part of the indoor heat exchanger is equal to the heat exchange amount of the first part of the indoor heat exchanger, and the cold amount output by the air conditioner 100 to the indoor is used to maintain the indoor temperature within the target range to achieve the effect of dehumidification without cooling.

[0280] like Fig.16 As shown, in the third sub-mode, the heat exchange amount of the second part of the indoor heat exchanger is greater than the heat exchange amount of the first part of the indoor heat exchanger, and the air conditioner 100 outputs heat to the indoor room to increase the indoor temperature to achieve the effect of reheating and dehumidification.

[0281] In the above embodiments, the present application proposes an air conditioner, which includes a first indoor heat exchanger and a second indoor heat exchanger arranged in an indoor unit, a second expansion valve arranged between the first indoor heat exchanger and the second indoor heat exchanger, an outdoor heat exchanger and a first expansion valve arranged in an outdoor unit, an indoor humidity detection device for detecting indoor ambient humidity, an indoor temperature detection device for detecting indoor ambient temperature, and a first inner coil temperature detection device and a second inner coil temperature detection device for detecting the inner coil temperatures of the two indoor heat exchangers. The controller is configured to judge a target sub-mode according to a relationship between a set temperature and the indoor ambient temperature, and enter the judged target sub-mode control when the set humidity is lower than the indoor ambient humidity to achieve precise regulation.

[0282] Each target sub-mode is set with a corresponding indoor ambient temperature range. During the adjustment process, the first expansion valve opening is adjusted by the inner disk temperature of the first indoor heat exchanger, the compressor operating frequency is adjusted by the inner disk temperature of the second indoor heat exchanger, and then the second expansion valve opening is adjusted according to the indoor ambient temperature to maintain the indoor ambient temperature within the corresponding indoor ambient temperature range. Through the setting of multiple target sub-modes, at least a multi-stage temperature control dehumidification effect of reheating, no cooling, slight cooling and cooling can be achieved in the dehumidification mode, while reducing the room humidity, the thermal comfort of the user is also considered to meet the user's usage needs in different hot and humid environments.

[0283] The air conditioner 100 provided in the present application determines the target sub-mode according to the relationship between the set temperature and the indoor ambient temperature. When the set humidity is lower than the indoor ambient humidity, the determined target sub-mode control is entered. During the adjustment process, the first expansion valve opening is adjusted by the inner disk temperature of the first indoor heat exchanger, the operating frequency of the compressor is adjusted by the inner disk temperature of the second indoor heat exchanger, and then the opening of the second expansion valve is adjusted according to the indoor ambient temperature to maintain the indoor ambient temperature within the corresponding indoor ambient temperature range. Through the setting of multiple target sub-modes, at least a multi-stage temperature control dehumidification effect of reheating, no cooling, slight cooling and cooling can be achieved in the dehumidification mode, and the thermal comfort of the user is also considered while reducing the room humidity to meet the user's usage needs in different hot and humid environments.

[0284] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An air conditioner, characterized in that: include: The indoor unit comprises: Indoor shell; a first indoor heat exchanger disposed in the indoor housing, wherein the first indoor heat exchanger operates as a condenser in a first mode; a second indoor heat exchanger disposed in the indoor housing, the second indoor heat exchanger operating as an evaporator in a first mode; a second expansion valve, which is disposed between the first indoor heat exchanger and the second indoor heat exchanger, and adjusts the refrigerant flow between the first indoor heat exchanger and the second indoor heat exchanger by adjusting its opening degree, so as to adjust the heat exchange between the first indoor heat exchanger and the second indoor heat exchanger; The outdoor unit comprises: Outdoor housing; a compressor and an outdoor heat exchanger disposed in the outdoor housing, wherein the outdoor heat exchanger operates as a condenser in a first mode; An outdoor fan, which rotates to allow outdoor wind to enter the outdoor housing, and the outdoor wind exchanges heat with the outdoor heat exchanger and flows out of the outdoor housing; The air conditioner further comprises: a first expansion valve, which is disposed between the outdoor heat exchanger and the first indoor heat exchanger; A refrigerant circulation loop formed by the refrigerant circulating in sequence through the compressor, the outdoor heat exchanger, the first expansion valve, the first indoor heat exchanger, the second expansion valve and the second indoor heat exchanger; An indoor humidity detection device, which is used to detect indoor humidity; An indoor temperature detection device, used for detecting indoor temperature; The first inner coil temperature detection device is provided in the first indoor heat exchanger and is used to detect the inner coil temperature T of the first indoor heat exchanger. p1 ; The second inner coil temperature detection device is provided in the second indoor heat exchanger and is used to detect the inner coil temperature T of the second indoor heat exchanger. p2 ; The controller is configured as: Get the indoor temperature T in , indoor humidity, set temperature T set , set humidity, first indoor heat exchanger inner plate temperature T p1 , the second indoor heat exchanger inner plate temperature T p2 ; According to the critical values ​​of multiple temperature zones, multiple sub-modes are divided, each sub-mode has a corresponding indoor temperature range, and according to the set temperature T set Determine the current target sub-mode; If the set humidity is lower than the indoor humidity, entering the determined target sub-mode; According to the first indoor heat exchanger inner plate temperature T p1 adjusting the opening of the first expansion valve; According to the second indoor heat exchanger inner plate temperature T p2 adjusting the operating frequency of the compressor; According to the indoor temperature T in , adjust the opening of the second expansion valve to in Maintain the indoor temperature range corresponding to the sub-mode.

2. An air conditioner according to claim 1, characterized in that: The controller is configured to divide into a plurality of sub-modes according to a plurality of temperature zone critical values, including: Subtracting the indoor temperature from a plurality of preset sub-mode temperature values ​​to obtain a plurality of temperature zone critical values, dividing a plurality of continuous and non-overlapping temperature intervals by the plurality of temperature zone critical values, each of the sub-modes corresponding to a temperature interval, so as to ensure that only one target sub-mode is determined according to the set temperature; or, The preset indoor temperature is subtracted from multiple preset sub-mode temperature values ​​to obtain multiple temperature zone critical values, and multiple continuous and non-overlapping temperature intervals are divided by the multiple temperature zone critical values. Each sub-mode corresponds to a temperature interval to ensure that only one target sub-mode is determined according to the set temperature.

3. An air conditioner according to claim 1, characterized in that: The controller is configured to, according to the indoor temperature T in , adjusting the opening degree of the second expansion valve, comprising: If the indoor temperature T in If the indoor temperature is within the range corresponding to the sub-mode, the opening of the second expansion valve remains unchanged; if T in If the indoor temperature exceeds the indoor temperature range corresponding to the sub-mode, the opening of the second expansion valve is reduced; if T in If the indoor temperature is lower than the indoor temperature range corresponding to the sub-mode, the opening degree of the second expansion valve is increased.

4. An air conditioner according to claim 1, characterized in that: The controller is configured to, according to the inner plate temperature T of the first indoor heat exchanger p1 Adjusting the opening degree of the first expansion valve includes: A first indoor heat exchanger inner disk temperature interval corresponding to each sub-mode is provided; If the inner plate temperature of the first indoor heat exchanger is T p1 If the temperature of the first indoor heat exchanger is within the temperature range of the first indoor heat exchanger corresponding to the sub-mode, the opening of the first expansion valve remains unchanged; if T p1 If the opening of the first expansion valve exceeds this interval, the first expansion valve opening is reduced; if T p1 If the temperature is lower than this range, the opening of the first expansion valve is increased.

5. The air conditioner according to claim 1, characterized in that: The controller is configured to, according to the inner plate temperature T of the second indoor heat exchanger p2 Adjusting the operating frequency of the compressor comprises: If the inner plate temperature of the second indoor heat exchanger is T p2 If the dew point temperature is within the range, the operating frequency of the compressor remains unchanged; if T p2 If the dew point temperature exceeds the range, the operating frequency of the compressor is increased; if T p2 If the dew point temperature is lower than this range, the operating frequency of the compressor is reduced.

6. The air conditioner according to claim 1, characterized in that: The controller is configured to adjust the speed of the indoor fan according to the indoor humidity: The indoor humidity range is from d1 to d2, where the difference between d1 and d2 and the indoor humidity is a fixed preset value; If the indoor humidity does not reach d1, the indoor fan operates at a first speed; If the indoor humidity is within the indoor humidity range, the indoor fan operates at a second speed; If the indoor humidity exceeds d2, the indoor fan operates at a third speed.

7. An air conditioner according to claim 1, characterized in that: The controller is configured such that the sub-modes include a fourth sub-mode having a corresponding indoor temperature interval; If the set humidity is lower than the indoor humidity, entering the fourth sub-mode; adjusting the opening of the first expansion valve according to the inner disk temperature of the first indoor heat exchanger; adjusting the operating frequency of the compressor according to the inner disk temperature of the second indoor heat exchanger; According to the indoor temperature T in , adjust the speed of the outdoor fan.

8. An air conditioner according to claim 6, characterized in that: The controller is configured to, according to the indoor temperature T in , adjusting the speed of the outdoor fan, including: If the indoor temperature T in In the indoor temperature range corresponding to the fourth sub-mode, the speed of the outdoor fan remains unchanged; if T in If the indoor temperature exceeds the range, the speed of the outdoor fan is increased; if T in If the indoor temperature is lower than the range, the rotation speed of the outdoor fan is reduced.

9. An air conditioner according to claim 6, characterized in that: The controller is configured to adjust the opening of the first expansion valve according to the inner disk temperature of the first indoor heat exchanger, and adjust the operating frequency of the compressor according to the inner disk temperature of the second indoor heat exchanger, including: If the inner plate temperature of the first indoor heat exchanger is T p1 If the dew point temperature is within the range, the first expansion valve opening remains unchanged; if T p1 If the dew point temperature exceeds the range, the first expansion valve opening is reduced; if T p1 If the temperature is lower than the dew point temperature range, the opening of the first expansion valve is increased; If the inner plate temperature of the second indoor heat exchanger is T p2 If the dew point temperature is within the range, the operating frequency of the compressor remains unchanged; if T p2 If the dew point temperature exceeds the range, the operating frequency of the compressor is increased; if T p2 If the dew point temperature is lower than this range, the operating frequency of the compressor is reduced.

10. An air conditioner, characterized in that: include: The indoor unit comprises: Indoor shell; a first indoor heat exchanger disposed in the indoor housing, wherein the first indoor heat exchanger operates as a condenser in a first mode; a second indoor heat exchanger disposed in the indoor housing, the second indoor heat exchanger operating as an evaporator in a first mode; a second expansion valve, which is disposed between the first indoor heat exchanger and the second indoor heat exchanger, and adjusts the refrigerant flow between the first indoor heat exchanger and the second indoor heat exchanger by adjusting its opening degree, so as to adjust the heat exchange between the first indoor heat exchanger and the second indoor heat exchanger; The outdoor unit comprises: Outdoor housing; a compressor, an outdoor heat exchanger and a first expansion valve disposed in the outdoor housing, the outdoor heat exchanger operating as a condenser in a first mode; An outdoor fan, which rotates to allow outdoor wind to enter the outdoor housing, and the outdoor wind exchanges heat with the outdoor heat exchanger and flows out of the outdoor housing; The air conditioner further comprises: A refrigerant circulation loop formed by the refrigerant circulating in sequence through the compressor, the outdoor heat exchanger, the first expansion valve, the first indoor heat exchanger, the second expansion valve and the second indoor heat exchanger; An indoor humidity detection device, which is used to detect indoor humidity; An indoor temperature detection device, used for detecting indoor temperature; The first inner coil temperature detection device is provided in the first indoor heat exchanger and is used to detect the inner coil temperature T of the first indoor heat exchanger. p1 ; The second inner coil temperature detection device is provided in the second indoor heat exchanger and is used to detect the inner coil temperature T of the second indoor heat exchanger. p2 ; The controller is configured as: Get the indoor temperature T in , indoor humidity, set temperature T set , set humidity, first indoor heat exchanger inner plate temperature T p1 , the second indoor heat exchanger inner plate temperature T p2 ; According to the set temperature T set With indoor temperature T in , determine the target sub-mode in the first mode; Including the first sub-mode, the second sub-mode, and the third sub-mode, when T in1 <T set ≤T in2 When T in2 <T set ≤T in When T in <T set ≤T in3 When it is judged as the third sub-mode, T in1 , T in2 , T in3 With the indoor temperature T in The difference is a fixed preset value; each target sub-mode has a corresponding indoor temperature range; If the set humidity is lower than the indoor humidity, entering the determined target sub-mode; According to the first indoor heat exchanger inner plate temperature T p1 adjusting the opening of the first expansion valve; According to the second indoor heat exchanger inner plate temperature T p2 adjusting the operating frequency of the compressor; According to the indoor temperature T in , adjust the opening of the second expansion valve to in Maintain the indoor temperature range corresponding to the sub-mode.

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