Air conditioner and control method thereof

Abstract

The present invention discloses an air conditioner and a control method thereof, wherein the control method of the air conditioner comprises: obtaining a target temperature and a current indoor ambient temperature, and calculating the difference between the current indoor ambient temperature and the target temperature, which is recorded as the target temperature difference; confirming that the target temperature difference is less than or equal to a first preset temperature difference, all indoor heat exchangers are all heating, wherein the first preset temperature difference is less than 0; and / or, confirming that the target temperature difference is greater than or equal to a second preset temperature difference, all indoor heat exchangers are all cooling, wherein the second preset temperature difference is greater than 0; and / or, confirming that the target temperature difference is greater than the first preset temperature difference and less than the second preset temperature difference, and controlling the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to cool, heat or turn off according to the value of the target temperature difference; wherein the first preset temperature difference is less than 0, and the second preset temperature difference is greater than 0. The technical solution of the present invention improves the adaptability of the air conditioner.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner and a control method thereof. Background Art

[0002] As people's living standards improve, the use of air conditioners is becoming more and more common, and at the same time, people have higher demands on air conditioners. The existing air conditioner indoor unit has a fixed indoor heat exchanger and a fixed and unadjustable heat exchange area, which makes the temperature range that can be adjusted by the air conditioner small during the temperature adjustment process and cannot meet the needs of users. Summary of the invention

[0003] The main purpose of the present invention is to provide a control method for an air conditioner, aiming to improve the adaptability of the air conditioner.

[0004] To achieve the above object, the present invention provides an air conditioner indoor unit, the air conditioner includes the air conditioner indoor unit, characterized in that the air conditioner indoor unit includes at least three indoor heat exchangers, namely a first indoor heat exchanger, a second indoor heat exchanger and a third indoor heat exchanger, wherein:

[0005] The first indoor heat exchanger has a first port and a second port for refrigerant to enter or flow out of the first indoor heat exchanger, the first port is configured to communicate with a liquid pipe of the air conditioner, and the second port is configured to communicate with high and low pressure pipes of the air conditioner and / or is configured to communicate with an air pipe of the air conditioner;

[0006] The second indoor heat exchanger has a third port and a fourth port for refrigerant to enter or flow out of the second indoor heat exchanger, the third port is configured to communicate with the liquid pipe of the air conditioner, and the fourth port is configured to communicate with the high and low pressure pipes of the air conditioner and / or is configured to communicate with the air pipe of the air conditioner; the third port is connected to the liquid pipe of the air conditioner through the second refrigerant pipe, and the second refrigerant pipe is provided with a second indoor throttling device;

[0007] The third indoor heat exchanger has a fifth port and a sixth port for refrigerant to enter or flow out of the third indoor heat exchanger, the fifth port is configured to communicate with the liquid pipe of the air conditioner, and the sixth port is configured to communicate with the high and low pressure pipes of the air conditioner and / or is configured to communicate with the air pipe of the air conditioner; the fifth port is connected to the liquid pipe of the air conditioner through the third refrigerant pipe, and the third refrigerant pipe is provided with a third indoor throttling device;

[0008] The control method of the air conditioner comprises:

[0009] Obtain the target temperature and the current indoor ambient temperature, and calculate the difference between the current indoor ambient temperature and the target temperature, which is recorded as the target temperature difference;

[0010] Confirm that the target temperature difference is less than or equal to the first preset temperature difference, and all indoor heat exchangers are in heating mode, wherein the first preset temperature difference is less than 0; and / or,

[0011] Confirm that the target temperature difference is greater than or equal to the second preset temperature difference, and all indoor heat exchangers are in cooling mode, wherein the second preset temperature difference is greater than 0; and / or,

[0012] Confirm that the target temperature difference is greater than the first preset temperature difference and less than the second preset temperature difference, and control the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to cool, heat or shut down according to the value of the target temperature difference; wherein the first preset temperature difference is less than 0 and the second preset temperature difference is greater than 0.

[0013] Optionally, the step of controlling the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to cool, heat or turn off according to the value of the target temperature difference specifically includes:

[0014] According to the value of the target temperature difference, the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are controlled to partially cool and partially heat, or partially cool and partially close, or partially heat and partially close, or partially cool, partially heat and partially close.

[0015] Optionally, the step of controlling the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to cool, heat or turn off according to the value of the target temperature difference specifically includes:

[0016] Confirm that the target temperature difference is greater than the third preset temperature difference and less than the fourth preset temperature difference, the first indoor heat exchanger cools and one of the second indoor heat exchangers cools, the other heats, and the third heat exchanger is turned off; wherein the third preset temperature difference is less than 0 and greater than the first preset temperature difference; the fourth preset temperature difference is greater than zero and less than the second preset temperature difference; and / or,

[0017] Confirm that the target temperature difference is less than or equal to a third preset temperature difference; obtain the current relative humidity in the room, and control one or more of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger for heating according to the current relative humidity; wherein the third preset temperature difference is less than 0 and greater than the first preset temperature difference; and / or,

[0018] Confirm that the target temperature difference is greater than or equal to a fourth preset temperature difference, obtain the current relative humidity in the room, and control the refrigeration of one or more of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger according to the current relative humidity; wherein the fourth preset temperature difference is greater than zero and less than the second preset temperature difference.

[0019] Optionally, the step of controlling one or more of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger for heating according to the current relative humidity specifically includes:

[0020] Compare current relative humidity with preset humidity;

[0021] Confirm that the current relative humidity is greater than or equal to the preset humidity, control one of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to cool, and the other two to heat; and / or,

[0022] It is confirmed that the current relative humidity is less than the preset humidity, and one or two of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are controlled to heat, and the others are turned off.

[0023] Optionally, the housing of the air conditioner indoor unit has an air inlet, an air outlet, and an air duct connecting the air inlet and the air outlet, a plurality of indoor heat exchangers are arranged in the air duct, the first indoor heat exchanger and the second indoor heat exchanger are arranged near the air inlet, and the third indoor heat exchanger is arranged on a side of the second indoor heat exchanger facing away from the air inlet;

[0024] The steps of confirming that the current relative humidity is greater than or equal to the preset humidity, controlling one of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to cool, and the other two to heat include:

[0025] The first indoor heat exchanger and the third indoor heat exchanger are controlled to provide heating, and the second indoor heat exchanger is controlled to provide cooling.

[0026] Optionally, the air conditioner indoor unit further includes a fourth indoor heat exchanger, which is connected in parallel with the second indoor heat exchanger; the housing of the air conditioner indoor unit has an air inlet, an air outlet, and an air duct connecting the air inlet and the air outlet, a plurality of indoor heat exchangers are arranged in the air duct, the first indoor heat exchanger and the second indoor heat exchanger are arranged close to the air inlet, the third indoor heat exchanger is arranged on a side of the second indoor heat exchanger facing away from the air inlet, and the fourth indoor heat exchanger is arranged on a side of the first indoor heat exchanger facing away from the air inlet;

[0027] The step of controlling one or more of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger for heating according to the current relative humidity specifically includes:

[0028] The first indoor heat exchanger or the second indoor heat exchanger is controlled to cool, and the third indoor heat exchanger and the fourth indoor heat exchanger are controlled to heat.

[0029] Optionally, the step of controlling the refrigeration of one or more of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger according to the current relative humidity specifically includes:

[0030] Compare current relative humidity with preset humidity;

[0031] Confirming that the current relative humidity is greater than or equal to the preset humidity, controlling one of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to heat, and the other two to cool; and / or,

[0032] It is confirmed that the current relative humidity is less than the preset humidity, and one or two of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are controlled to cool, and the others are turned off.

[0033] Optionally, the housing of the air conditioner indoor unit has an air inlet, an air outlet, and an air duct connecting the air inlet and the air outlet, a plurality of indoor heat exchangers are arranged in the air duct, the first indoor heat exchanger and the second indoor heat exchanger are arranged near the air inlet, and the third indoor heat exchanger is arranged on a side of the second indoor heat exchanger facing away from the air inlet;

[0034] Confirming that the current relative humidity is greater than or equal to the preset humidity, controlling one of the first indoor heat exchanger, the second indoor heat exchanger, and the third indoor heat exchanger to heat, and the other two to cool specifically include:

[0035] The first indoor heat exchanger and the second indoor heat exchanger are controlled to cool, and the third indoor heat exchanger is controlled to heat.

[0036] Optionally, the first port is connected to a liquid pipe of the air conditioner through a first refrigerant pipe, and a first indoor throttling device is provided on the first refrigerant pipe; and / or,

[0037] The second port is connected to the high and low pressure pipes of the air conditioner through a first connecting pipe, and a first control valve is provided on the first connecting pipe; the second port is connected to the air pipe of the air conditioner through a second connecting pipe, and a second control valve is provided on the second connecting pipe; and / or,

[0038] The fourth port is connected to the high and low pressure pipes of the air conditioner through the third connecting pipe, and the third connecting pipe is provided with a third control valve; the fourth port is connected to the air pipe of the air conditioner through the fourth connecting pipe, and the fourth connecting pipe is provided with a fourth control valve; and / or,

[0039] The sixth port is connected to the high and low pressure pipes of the air conditioner through a fifth connecting pipe, and a fifth control valve is provided on the fifth connecting pipe; the sixth port is connected to the air pipe of the air conditioner through a sixth connecting pipe, and a sixth control valve is provided on the sixth connecting pipe; and / or,

[0040] The air conditioner indoor unit further comprises a fourth indoor heat exchanger, the fourth indoor heat exchanger having a seventh port and an eighth port for refrigerant to enter or flow out of the fourth indoor heat exchanger; the seventh port is connected to the liquid pipe through a fourth refrigerant pipe, and a fourth indoor throttling device is provided on the fourth refrigerant pipe; the eighth port is configured to be connected to the high-low pressure pipe or the gas pipe; the eighth port is connected to the high-low pressure pipe through a seventh connecting pipe, and a seventh control valve is provided on the seventh connecting pipe; and / or the eighth port is connected to the gas pipe through an eighth connecting pipe, and an eighth control valve is provided on the eighth connecting pipe;

[0041] The method of closing the first indoor heat exchanger includes closing the first indoor throttling device, and / or closing the first control valve and the second control valve; and / or,

[0042] The method of closing the second indoor heat exchanger includes closing the second indoor throttling device, and / or closing the third control valve and the fourth control valve; and / or,

[0043] The method of closing the third indoor heat exchanger includes closing the third indoor throttling device, and / or closing the fifth control valve and the sixth control valve; and / or,

[0044] The method of closing the fourth indoor heat exchanger includes closing the fourth indoor throttling device, and / or closing the seventh control valve and the eighth control valve.

[0045] Optionally, the first port is connected to a liquid pipe of the air conditioner through a first refrigerant pipe, and a first indoor throttling device is provided on the first refrigerant pipe.

[0046] Optionally, the air conditioner further includes a first four-way valve, and the liquid pipe is connected to the first refrigerant pipe, the second refrigerant pipe and the third refrigerant pipe respectively through the first four-way valve.

[0047] Optionally, the second port is connected to the high and low pressure pipes of the air conditioner through a first connecting pipe, and a first control valve is provided on the first connecting pipe;

[0048] The second port is communicated with the air pipe of the air conditioner through a second connecting pipe, and a second control valve is arranged on the second connecting pipe.

[0049] Optionally, the fourth port is connected to the high and low pressure pipes of the air conditioner through a third connecting pipe, and a third control valve is provided on the third connecting pipe;

[0050] The fourth port is communicated with the air pipe of the air conditioner through a fourth connecting pipe, and a fourth control valve is arranged on the fourth connecting pipe.

[0051] Optionally, the sixth port is connected to the high and low pressure pipes of the air conditioner through a fifth connecting pipe, and a fifth control valve is provided on the fifth connecting pipe;

[0052] The sixth port is communicated with the air pipe of the air conditioner through a sixth connecting pipe, and a sixth control valve is arranged on the sixth connecting pipe.

[0053] Optionally, the second port is connected to the high and low pressure pipes of the air conditioner through the first connecting pipe, the fourth port is connected to the high and low pressure pipes of the air conditioner through the third connecting pipe, and the sixth port is connected to the high and low pressure pipes of the air conditioner through the fifth connecting pipe;

[0054] The air conditioner also includes a second four-way valve, and the high-pressure and low-pressure pipes are respectively connected with the first connecting pipe, the third connecting pipe and the fifth connecting pipe through the second four-way valve.

[0055] Optionally, the second port is connected to the air pipe of the air conditioner through a second connecting pipe, the fourth port is connected to the air pipe through a fourth connecting pipe, and the sixth port is connected to the air pipe through a sixth connecting pipe;

[0056] The air conditioner further comprises a third four-way valve, through which the air pipe is respectively connected with the second connecting pipe, the fourth connecting pipe and the sixth connecting pipe.

[0057] Optionally, a plurality of indoor heat exchangers are arranged to form a closed polygon.

[0058] Optionally, the air conditioner indoor unit further includes a fourth indoor heat exchanger, and the fourth indoor heat exchanger is connected in parallel with the second indoor heat exchanger;

[0059] The first indoor heat exchanger to the fourth indoor heat exchanger are spliced ​​to form a quadrilateral.

[0060] Optionally, the housing of the air conditioner indoor unit has an air inlet, an air outlet, and an air duct connecting the air inlet and the air outlet;

[0061] A plurality of indoor heat exchangers are arranged in the air duct, and the indoor heat exchangers are arranged at an angle to the extension direction of the air duct.

[0062] Optionally, the air conditioner comprises:

[0063] Air conditioner indoor unit;

[0064] An air conditioner outdoor unit, the outdoor unit comprising a compression mechanism and an outdoor heat exchanger;

[0065] A discharge pipe connected to the discharge side of the compression mechanism, a suction pipe connected to the suction side of the compression mechanism, and a liquid pipe sequentially connected to the discharge pipe, an outdoor heat exchanger, and one or more indoor heat exchangers of the air conditioner indoor unit;

[0066] an air pipe connecting one or more indoor heat exchangers to the suction pipe; and,

[0067] The air conditioner further comprises a high- and low-pressure pipe and a branch pipe branched from the discharge pipe, wherein the high- and low-pressure pipe sequentially connects a first intersection of the liquid pipe, one or more indoor heat exchangers and the branch pipe, wherein the first intersection is located between the indoor heat exchanger and the outdoor heat exchanger;

[0068] The air conditioner indoor unit includes at least three indoor heat exchangers, namely a first indoor heat exchanger, a second indoor heat exchanger and a third indoor heat exchanger.

[0069] The first indoor heat exchanger has a first port and a second port for refrigerant to enter or flow out of the first indoor heat exchanger, the first port is configured to communicate with a liquid pipe of the air conditioner, and the second port is configured to communicate with high and low pressure pipes of the air conditioner and / or is configured to communicate with an air pipe of the air conditioner;

[0070] The second indoor heat exchanger has a third port and a fourth port for refrigerant to enter or flow out of the second indoor heat exchanger, the third port is configured to communicate with the liquid pipe of the air conditioner, and the fourth port is configured to communicate with the high and low pressure pipes of the air conditioner and / or is configured to communicate with the air pipe of the air conditioner; the third port is connected to the liquid pipe of the air conditioner through the second refrigerant pipe, and the second refrigerant pipe is provided with a second indoor throttling device;

[0071] The third indoor heat exchanger has a fifth port and a sixth port for refrigerant to enter or flow out of the third indoor heat exchanger, the fifth port is configured to be connected to the liquid pipe of the air conditioner, the sixth port is configured to be connected to the high and low pressure pipes of the air conditioner and / or configured to be connected to the air pipe of the air conditioner; the fifth port is connected to the liquid pipe of the air conditioner through the third refrigerant pipe, and the third refrigerant pipe is provided with a third indoor throttling device.

[0072] Optionally, the air conditioner further comprises a first switch, which can switch between a first switching state of the first switch and a second switching state of the first switch.

[0073] In the first switching state, the first switch connects the liquid pipe with the suction pipe and connects the gas pipe with the discharge pipe;

[0074] In the second switching state, the first switch connects the liquid pipe with the discharge pipe and connects the gas pipe with the suction pipe; and / or

[0075] The air conditioner also includes a second switch, which can switch between a third switching state and a fourth switching state of the second switch. In the third switching state, the second switch connects the high and low pressure pipes with the branch pipe; in the fourth switching state, the second switch connects the high and low pressure pipes with the suction pipe.

[0076] The present invention also provides an air conditioner, the air conditioner comprising a memory, a processor, and a control program of the air conditioner stored in the memory and executable on the processor, wherein the control program of the air conditioner implements various steps of the control method of the air conditioner when executed by the processor;

[0077] Wherein, the control method of the air conditioner includes:

[0078] Obtain the target temperature and the current indoor ambient temperature, and calculate the difference between the current indoor ambient temperature and the target temperature, which is recorded as the target temperature difference;

[0079] Confirm that the target temperature difference is less than or equal to the first preset temperature difference, and all indoor heat exchangers are in heating mode, wherein the first preset temperature difference is less than 0; and / or,

[0080] Confirm that the target temperature difference is greater than or equal to the second preset temperature difference, and all indoor heat exchangers are in cooling mode, wherein the second preset temperature difference is greater than 0; and / or,

[0081] Confirm that the target temperature difference is greater than the first preset temperature difference and less than the second preset temperature difference, and control the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to cool, heat or shut down according to the value of the target temperature difference; wherein the first preset temperature difference is less than 0 and the second preset temperature difference is greater than 0.

[0082] In the technical solution of the present invention, the first indoor heat exchanger can work first, and when the heat exchange area of ​​the heat exchanger needs to be increased, the second indoor heat exchanger and the third indoor heat exchanger can be selected to be connected; in addition, the working states of the first heat exchanger, the second heat exchanger and the third heat exchanger can be different, and they can all be heating, all cooling, or partly heating and partly cooling; in this way, the air-conditioning indoor unit can achieve cooling, heating, dehumidification and reheating, and by adjusting the area of ​​the indoor heat exchanger, the cooling, heating, reheating and dehumidification effects of the indoor heat exchanger can be more finely adjusted, so that the air conditioner can be adapted to more occasions, which is beneficial to improving the adaptability of the air conditioner; in order to more accurately meet the needs of users, the technical solution of the present invention obtains the target temperature and the current indoor ambient temperature, and calculates the current indoor ambient temperature The difference between the temperature and the target temperature is recorded as the target temperature difference; when it is confirmed that the target temperature difference is less than or equal to the first preset temperature difference, all indoor heat exchangers are heated, wherein the first preset temperature difference is less than 0, so as to meet the user's demand for rapid heating and quickly adjust the indoor temperature to the temperature required by the user; when it is confirmed that the target temperature difference is greater than or equal to the second preset temperature difference, all indoor heat exchangers are cooled, wherein the second preset temperature difference is greater than 0, so as to meet the user's demand for rapid cooling and quickly adjust the indoor temperature to the temperature required by the user; when it is confirmed that the target temperature difference is greater than the first preset temperature difference and less than the second preset temperature difference, the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are controlled to cool, heat or turn off according to the value of the target temperature difference; wherein the first preset temperature difference is less than 0, and the second preset temperature difference is greater than 0. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] 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 the structures shown in these drawings without paying creative work.

[0084] Figure 1 It is a structural schematic diagram of an embodiment of an air conditioner indoor unit of the present invention;

[0085] Figure 2 It is a structural schematic diagram of an air conditioner according to an embodiment of the present invention.

[0086] Description of Figure Numbers:

[0087]

[0088]

[0089] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0090] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0091] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0092] The present invention mainly proposes an air-conditioning indoor unit, which is mainly used in air conditioners, so that the air-conditioning indoor unit includes multiple parallel indoor heat exchangers, and the total heat exchange area of ​​the indoor heat exchangers can be adjusted as needed to meet different working conditions.

[0093] The specific structure of the air conditioner indoor unit will be mainly described below.

[0094] Reference Figure 1 to Figure 2 In the embodiment of the present invention, the air conditioner indoor unit includes at least three indoor heat exchangers, namely a first indoor heat exchanger 310, a second indoor heat exchanger 320 and a third indoor heat exchanger 330, wherein:

[0095] The first indoor heat exchanger 310 has a first port 311 and a second port 312 for the refrigerant to enter or flow out of the first indoor heat exchanger 310, the first port 311 is configured to communicate with the liquid pipe 610 of the air conditioner, and the second port 312 is configured to communicate with the high and low pressure pipes 620 of the air conditioner and / or is configured to communicate with the air pipe 630 of the air conditioner;

[0096] The second indoor heat exchanger 320 has a third port 321 and a fourth port 322 for the refrigerant to enter or flow out of the second indoor heat exchanger 320. The third port 321 is configured to communicate with the liquid pipe 610 of the air conditioner, and the fourth port 322 is configured to communicate with the high and low pressure pipes 620 of the air conditioner and / or is configured to communicate with the air pipe 630 of the air conditioner. The third port 321 is connected to the liquid pipe 610 of the air conditioner through the second refrigerant pipe 323, and the second indoor throttling device 324 is provided on the second refrigerant pipe 323.

[0097] The third indoor heat exchanger 330 has a fifth port 331 and a sixth port 332 for refrigerant to enter or flow out of the third indoor heat exchanger 330, the fifth port 331 is configured to be connected to the liquid pipe 610 of the air conditioner, and the sixth port 332 is configured to be connected to the high and low pressure pipes 620 of the air conditioner and / or configured to be connected to the air pipe 630 of the air conditioner; the fifth port 331 is connected to the liquid pipe 610 of the air conditioner through the third refrigerant pipe 333, and the third refrigerant pipe 333 is provided with a third indoor throttling device 334.

[0098] Specifically, in this embodiment, the air conditioner indoor unit includes a plurality of indoor heat exchangers, and three are used as an example for explanation. The first port 311 of the first indoor heat exchanger 310 is connected to the liquid pipe 610 of the air conditioner, and the second port 312 is connected to the high and low pressure pipes 620 or the gas pipe 630. When the refrigerant enters the first indoor heat exchanger 310 from the first port 311 and flows out of the first indoor heat exchanger 310 from the second port 312, the first indoor heat exchanger 310 cools; when the refrigerant enters the first indoor heat exchanger 310 from the second port 312 and flows out of the first indoor heat exchanger 310 from the first port 311, the first indoor heat exchanger 310 heats. When the first indoor heat exchanger 310 is cooling, the refrigerant starts from the compressor 710, and under the guidance of the liquid pipe 610, passes through the outdoor heat exchanger 750, enters the first indoor heat exchanger 310 through the first port 311, flows out of the first indoor heat exchanger 310 through the second port 312, and then flows back to the gas-liquid separator 720 or the suction pipe 712 through the gas pipe 630, and then flows back to the compressor 710. When the first indoor heat exchanger 310 is heating, the refrigerant has two flow modes. The first is that after being discharged from the compressor 710, the refrigerant enters the gas pipe 630 through the discharge pipe 711, enters the first indoor heat exchanger 310 through the second port 312, and then flows out of the first indoor heat exchanger 310 from the first port 311, flows into the outdoor heat exchanger 750 through the liquid pipe 610, flows into the suction pipe 712 after passing through the outdoor heat exchanger 750, and flows back to the compressor 710. The second type is that the refrigerant flows out of the compressor 710, flows into the high and low pressure pipes through the discharge pipe 711, enters the first indoor heat exchanger 310 through the second port 312, and then flows out of the first indoor heat exchanger 310 from the first port 311, flows into the outdoor heat exchanger 750 through the liquid pipe 610, and then flows into the suction pipe 712 through the liquid pipe 610 after passing through the outdoor heat exchanger 750, and flows back to the compressor 710.

[0099] Similarly, the third port 321 of the second indoor heat exchanger 320 is connected to the liquid pipe 610 of the air conditioner, and the fourth port 322 is connected to the high-low pressure pipe 620 or the gas pipe 630. When the refrigerant enters the second indoor heat exchanger 320 from the third port 321 and flows out of the second indoor heat exchanger 320 from the fourth port 322, the second indoor heat exchanger 320 cools; when the refrigerant enters the second indoor heat exchanger 320 from the fourth port 322 and flows out of the second indoor heat exchanger 320 from the third port 321, the second indoor heat exchanger 320 heats. When the second indoor heat exchanger 320 is cooling, the refrigerant starts from the compressor 710, and under the guidance of the liquid pipe 610, passes through the outdoor heat exchanger 750, enters the second indoor heat exchanger 320 through the third port 321, flows out of the second indoor heat exchanger 320 from the fourth port 322, and then flows back to the gas-liquid separator 720 or the suction pipe 712 through the gas pipe 630, and then flows back to the compressor 710. When the second indoor heat exchanger 320 is heating, the refrigerant has two flow modes. The first is that after being discharged from the compressor 710, the refrigerant enters the gas pipe 630 through the discharge pipe 711, enters the second indoor heat exchanger 320 through the fourth port 322, and then flows out of the second indoor heat exchanger 320 from the third port 321, flows into the outdoor heat exchanger 750 through the liquid pipe 610, flows into the suction pipe 712 after passing through the outdoor heat exchanger 750, and flows back to the compressor 710. The second type is that the refrigerant flows out of the compressor 710, flows into the high and low pressure pipes through the discharge pipe 711, enters the second indoor heat exchanger 320 through the fourth port 322, and then flows out of the second indoor heat exchanger 320 from the third port 321, flows into the outdoor heat exchanger 750 through the liquid pipe 610, flows into the suction pipe 712 through the liquid pipe 610 after passing through the outdoor heat exchanger 750, and flows back to the compressor 710. The opening and closing of the second indoor throttling device 324 controls whether the second indoor heat exchanger 320 is involved in the work.

[0100] Similarly, the fifth port 331 of the third indoor heat exchanger 330 is connected to the liquid pipe 610 of the air conditioner, and the sixth port 332 is connected to the high-low pressure pipe 620 or the gas pipe 630. When the refrigerant enters the third indoor heat exchanger 330 from the fifth port 331 and flows out of the third indoor heat exchanger 330 from the sixth port 332, the third indoor heat exchanger 330 performs cooling; when the refrigerant enters the third indoor heat exchanger 330 from the sixth port 332 and flows out of the third indoor heat exchanger 330 from the fifth port 331, the third indoor heat exchanger 330 performs heating. When the third indoor heat exchanger 330 is cooling, the refrigerant starts from the compressor 710, under the guidance of the liquid pipe 610, passes through the outdoor heat exchanger 750, enters the third indoor heat exchanger 330 through the fifth port 331, flows out of the third indoor heat exchanger 330 from the sixth port 332, and then flows back to the gas-liquid separator 720 or the suction pipe 712 through the gas pipe 630, and then flows back to the compressor 710. When the third indoor heat exchanger 330 is heating, the refrigerant has two flow modes. The first is that after being discharged from the compressor 710, the refrigerant enters the gas pipe 630 through the discharge pipe 711, enters the third indoor heat exchanger 330 through the sixth port 332, and then flows out of the third indoor heat exchanger 330 from the fifth port 331, flows into the outdoor heat exchanger 750 through the liquid pipe 610, flows into the suction pipe 712 after passing through the outdoor heat exchanger 750, and flows back to the compressor 710. The second is that the refrigerant flows out of the compressor 710, flows into the high and low pressure pipes through the discharge pipe 711, enters the third indoor heat exchanger 330 through the sixth port 332, and then flows out of the third indoor heat exchanger 330 from the fifth port 331, flows into the outdoor heat exchanger 750 through the liquid pipe 610, flows into the suction pipe 712 through the liquid pipe 610 after passing through the outdoor heat exchanger 750, and flows back to the compressor 710. The opening and closing of the third indoor throttling device 334 controls whether the third indoor heat exchanger 330 is involved in the work.

[0101] In this way, the first indoor heat exchanger 310 can work first, and when the heat exchange area of ​​the heat exchanger needs to be increased, the second indoor heat exchanger 320 and the third indoor heat exchanger 330 can be connected; in addition, the working states of the first heat exchanger, the second heat exchanger 320 and the third heat exchanger can be different, and they can be all heating, all cooling, partial heating and partial cooling; in this way, the air-conditioning indoor unit can achieve cooling, heating and dehumidification and reheating, and by adjusting the area of ​​the indoor heat exchanger, the cooling, heating and reheating and dehumidification effects of the indoor heat exchanger can be more finely adjusted, so that the air conditioner can be adapted to more occasions, which is beneficial to improving the adaptability of the air conditioner.

[0102] In some embodiments, in order to further improve the adaptability of the air conditioner, the first port 311 is connected to the liquid pipe 610 of the air conditioner through the first refrigerant pipe 313, and the first indoor throttling device 314 is provided on the first refrigerant pipe 313. By providing the first indoor throttling device 314 on the first refrigerant pipe 313, the first indoor heat exchanger 310 can be in a non-working state, so that the position of the working indoor heat exchanger among the multiple indoor heat exchangers can be arbitrarily selected according to needs.

[0103] Regarding the control of the on-off of the first refrigerant pipe 313, the second refrigerant pipe 323 and the third refrigerant pipe 333, in addition to the first throttling device, the second indoor throttling device 324 and the third indoor throttling device 334 for adjusting the flow rate, a dedicated control valve can also be provided. The air conditioner also includes a first four-way valve, and the liquid pipe 610 is connected to the first refrigerant pipe 313, the second refrigerant pipe 323 and the third refrigerant pipe 333 respectively through the first four-way valve. In some embodiments, in order to improve the installation convenience of the liquid pipe 610 and the first refrigerant pipe 313, the second refrigerant pipe 323 and the third refrigerant pipe 333 and improve the compactness of the structure, a four-way valve is used to realize the connection between the liquid pipe 610 and the three pipes. At this time, the four-way valve may not have a control function, and it is only necessary to realize that the liquid pipe 610 is connected to the three refrigerant pipes respectively. In some other embodiments, in order to further improve the on-off control between the liquid pipe 610 and the first refrigerant pipe 313, the second refrigerant pipe 323 and the third refrigerant pipe 333, the first four-way valve at this time may have the function of opening and closing the pipe opening. For example, the three pipe openings connected to the first refrigerant pipe 313, the second refrigerant pipe 323 and the third refrigerant pipe 333 can be opened and closed respectively.

[0104] When the second port 312 is connected to the high and low pressure pipes 620 and the air pipe 630 at the same time, the fourth port 322 is connected to the high and low pressure pipes 620 and the air pipe 630 at the same time, and the sixth port 332 is connected to the high and low pressure pipes 620 and the air pipe 630 at the same time, there are multiple ways to respectively control the first connecting pipe 315, the second connecting pipe 317, the third connecting pipe 325, the fourth connecting pipe 327, the fifth connecting pipe 335 and the sixth connecting pipe 337. Control valves can be respectively provided on the first connecting pipe 315, the second connecting pipe 317, the third connecting pipe 325, the fourth connecting pipe 327, the fifth connecting pipe 335 and the sixth connecting pipe 337, or a second four-way valve and a third four-way valve can be respectively provided to achieve this. In some embodiments, the two ways can exist at the same time, which will be described separately below.

[0105] The second port 312 is connected to the high and low pressure pipes 620 of the air conditioner through the first connecting pipe 315, and the first connecting pipe 315 is provided with a first control valve 316; the second port 312 is connected to the air pipe 630 of the air conditioner through the second connecting pipe 317, and the second connecting pipe 317 is provided with a second control valve 318. In this way, the second port 312 can be selectively connected to the high and low pressure pipes 620 or the air pipe 630, so that the working state of the first indoor heat exchanger 310 can be adjusted arbitrarily according to demand, and is not affected by the working mode of other indoor heat exchangers. For example, when the overall indoor unit needs to realize the reheat dehumidification function, some indoor heat exchangers are required to heat and some indoor heat exchangers are required to cool. Take the second indoor heat exchanger 320 cooling and the first indoor heat exchanger 310 heating as an example. Since the second indoor heat exchanger 320 is refrigerating, the refrigerant at this time passes through the outdoor heat exchanger 750 from the liquid pipe 610, and then is transported to the second indoor heat exchanger 320 by the liquid pipe 610 for refrigeration, and then the refrigerant is transported back to the suction pipe 712 by the gas pipe 630. At this time, the first indoor heat exchanger 310 needs to heat, and the refrigerant flows from the discharge pipe 711, through the bifurcated pipe 730, through the high and low pressure pipes 620 and the first connecting pipe 315 into the second port 312, and then flows out from the first port 311, enters the liquid pipe 610, and flows to the suction pipe 712 through the liquid pipe 610. In this process, the first control valve 316 is opened and the second control valve 318 is closed. In this way, the first indoor heat exchanger 310 can achieve a working state that cannot be achieved with other heat exchangers, which is conducive to improving the use occasions of the first indoor heat exchanger 310. When the first indoor heat exchanger 310 is refrigerating, the first control valve 316 is closed and the second control valve 318 is opened.

[0106] Similarly, the fourth port 322 is connected to the high and low pressure pipes 620 of the air conditioner through the third connecting pipe 325, and the third control valve 326 is provided on the third connecting pipe 325; the fourth port 322 is connected to the air pipe 630 of the air conditioner through the fourth connecting pipe 327, and the fourth control valve 328 is provided on the fourth connecting pipe 327. In this way, the fourth port 322 can be selectively connected to the high and low pressure pipes 620 or the air pipe 630, so that the working state of the second indoor heat exchanger 320 can be adjusted arbitrarily according to demand, and is not affected by the working mode of other indoor heat exchangers. When the second indoor heat exchanger 320 is cooling, the third control valve 326 is opened and / or the fourth control valve 328 is opened; when the second indoor heat exchanger 320 is heating, the third control valve 326 is opened and the fourth control valve 328 is closed, or the third control valve 326 is closed and the fourth control valve 328 is opened.

[0107] Similarly, the sixth port 332 is connected to the high and low pressure pipes 620 of the air conditioner through the fifth connecting pipe 335, and the fifth control valve 336 is provided on the fifth connecting pipe 335; the sixth port 332 is connected to the air pipe 630 of the air conditioner through the sixth connecting pipe 337, and the sixth control valve 338 is provided on the sixth connecting pipe 337. In this way, the fourth port 322 can be selectively connected to the high and low pressure pipes 620 or the air pipe 630, so that the working state of the second indoor heat exchanger 320 can be adjusted arbitrarily according to demand, and is not affected by the working mode of other indoor heat exchangers. When the third indoor heat exchanger 330 is cooling, the fifth control valve 336 is opened and / or the sixth control valve 338 is opened; when the third indoor heat exchanger 330 is heating, the fifth control valve 336 is opened and the sixth control valve 338 is closed, or the fifth control valve 336 is closed and the sixth control valve 338 is opened.

[0108] The second port 312 is connected to the high and low pressure pipes 620 of the air conditioner through the first connecting pipe 315, the fourth port 322 is connected to the high and low pressure pipes 620 of the air conditioner through the third connecting pipe 325, and the sixth port 332 is connected to the high and low pressure pipes 620 of the air conditioner through the fifth connecting pipe 335; the air conditioner also includes a second four-way valve, and the high and low pressure pipes 620 are connected to the first connecting pipe 315, the third connecting pipe 325 and the fifth connecting pipe 335 respectively through the second four-way valve.

[0109] Specifically, in this embodiment, the high-low pressure pipe 620 is connected to the first connecting pipe 315, the third connecting pipe and the fifth connecting pipe 335 respectively through the second four-way valve, and the ports of the second four-way valve connected to the above three connecting pipes can be controlled to open and close. In this way, the opening and closing of the first connecting pipe 315, the third connecting pipe 325 and the fifth connecting pipe 335 can be controlled by the second four-way valve. While facilitating the convenient connection of the high-low pressure pipe 620 and the first connecting pipe 315, the third connecting pipe 325 and the fifth connecting pipe 335, the control of the opening and closing of the three connecting pipes can be conveniently realized.

[0110] The second port 312 is connected to the air pipe 630 of the air conditioner through the second connecting pipe 317, the fourth port 322 is connected to the air pipe 630 through the fourth connecting pipe 327, and the sixth port 332 is connected to the air pipe 630 through the sixth connecting pipe 337; the air conditioner also includes a third four-way valve, and the air pipe 630 is connected to the second connecting pipe 317, the fourth connecting pipe 327 and the sixth connecting pipe 337 respectively through the third four-way valve.

[0111] Specifically, in this embodiment, the air pipe 630 is connected to the first connecting pipe 315, the third connecting pipe and the fifth connecting pipe 335 respectively through the third four-way valve, and the second four-way valve is connected to the ports of the above three connecting pipes respectively to control opening and closing. In this way, the opening and closing of the second connecting pipe 317, the fourth connecting pipe 327 and the sixth connecting pipe 337 can be controlled by the third four-way valve. While facilitating the convenient connection of the air pipe 630 with the second connecting pipe 317, the fourth connecting pipe 327 and the sixth connecting pipe 337, the control of the opening and closing of the three connecting pipes can be conveniently realized.

[0112] In some embodiments, in order to improve the heat exchange effect of the heat exchanger, multiple indoor heat exchangers are arranged to form a closed polygon. For example, the first indoor heat exchanger 310, the second indoor heat exchanger 320 and the third indoor heat exchanger 330 are arranged in a triangle. Such an arrangement can not only improve the compactness of the structure, but also improve the installation stability of each heat exchanger.

[0113] When the number of indoor heat exchangers is four, the air conditioner indoor unit further includes a fourth indoor heat exchanger 340, which is connected in parallel with the second indoor heat exchanger 320; the first indoor heat exchanger 310 to the fourth indoor heat exchanger 340 are spliced ​​to form a quadrilateral. One refrigerant port (the seventh port 341) of the fourth heat exchanger is connected to the liquid pipe 610, and the connection can be through the fourth refrigerant pipe 343. Another refrigerant port (the eighth port 342) is connected to the air pipe 630 or the high and low pressure pipe 620, the eighth port 342 can be connected to the high and low pressure pipe 620 through the seventh connecting pipe 345, the eighth port 342 can be connected to the air pipe 630 through the eighth connecting pipe 347, the seventh port 341 can be connected to the liquid pipe 610 through the fourth refrigerant pipe 343, and the fourth indoor throttling device 344 can be provided on the fourth refrigerant pipe 343. In this way, the fourth heat exchanger can also achieve heating or cooling like the first to third heat exchangers. At the same time, a seventh control valve 346 can be provided on the seventh connecting pipe 345, and an eighth control valve 348 can be provided on the eighth connecting pipe 347. The four indoor heat exchangers are arranged in a rhombus shape, and in order to improve the heat exchange efficiency of the indoor heat exchanger, the housing 100 of the air conditioner indoor unit has an air inlet, an air outlet, and an air duct connecting the air inlet and the air outlet; a plurality of the indoor heat exchangers are arranged in the air duct, and the indoor heat exchangers are arranged at an angle to the extension direction of the air duct. In this way, when the airflow flows through the air duct, it can pass through the four heat exchangers so that the heat exchange effect of the four heat exchangers is better. The throttling devices involved in this application, such as the first indoor throttling device 314, the second indoor throttling device 324, the third indoor throttling device 334, the fourth indoor throttling device 344, and the outdoor throttling device 770, etc., can all be throttling structures such as electronic expansion valves. It is worth noting that a fan 200 is also provided in the air duct, and the air outlet of the fan 200 is arranged toward the indoor heat exchanger.

[0114] It is worth noting that regarding the connection method between the liquid pipe 610 and the first refrigerant pipe 313, the second refrigerant pipe 323, the third refrigerant pipe 333 and the fourth refrigerant pipe 343, the first refrigerant pipe 313, the second refrigerant pipe 323, the third refrigerant pipe 333 and the fourth refrigerant pipe 343 can be connected to the liquid pipe 610 independently of each other, or multiple refrigerant pipes can be connected to the liquid pipe 610. For example, after the first refrigerant pipe 313 and the second refrigerant pipe 323 are connected, they are connected to the liquid pipe 610 through the first connecting pipe 510; after the third refrigerant pipe 333 and the fourth refrigerant pipe 343 are connected, they are connected to the liquid pipe 610 through the second connecting pipe 520.

[0115] Similarly, regarding the connection mode between the high-pressure and low-pressure pipes 620 and the first connecting pipe 315, the third connecting pipe 325, the fifth connecting pipe 335 and the seventh connecting pipe 345, the first connecting pipe 315, the third connecting pipe 325, the fifth connecting pipe 335 and the seventh connecting pipe 345 can be connected to the high-pressure and low-pressure pipes 620 independently of each other, or multiple connecting pipes can be connected to the high-pressure and low-pressure pipes 620. For example, after the first connecting pipe 315 is connected to the third connecting pipe 325, it is connected to the high-pressure and low-pressure pipes 620 through the third connecting pipe 530; after the fifth connecting pipe 335 is connected to the seventh connecting pipe 345, it is connected to the high-pressure and low-pressure pipes 620 through the fourth connecting pipe 540.

[0116] Similarly, regarding the connection mode between the air pipe 630 and the second connecting pipe 317, the fourth connecting pipe 327, the sixth connecting pipe 337 and the eighth connecting pipe 347, the second connecting pipe 317, the fourth connecting pipe 327, the sixth connecting pipe 337 and the eighth connecting pipe 347 can be connected to the air pipe 630 independently of each other, or multiple connecting pipes can be connected to the air pipe 630. For example, after the second connecting pipe 317 is connected to the fourth connecting pipe 327, it is connected to the air pipe 630 through the fifth connecting pipe 550; after the sixth connecting pipe 337 is connected to the eighth connecting pipe 347, it is connected to the air pipe 630 through the sixth connecting pipe 560.

[0117] The present invention also proposes an air conditioner, which includes an air-conditioning outdoor unit and an air-conditioning indoor unit. The specific structure of the air-conditioning indoor unit refers to the above-mentioned embodiment. Since this air conditioner adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one. Among them, the air conditioner outdoor unit includes a compressor 710 and an outdoor heat exchanger 750; a discharge pipe 711 connected to the discharge side of the compressor 710, a suction pipe 712 connected to the suction side of the compressor 710, a liquid pipe 610 connecting the discharge pipe 711, the outdoor heat exchanger 750, and one or more indoor heat exchangers of the air conditioner indoor unit in sequence; an air pipe 630 connecting one or more indoor heat exchangers and the suction pipe 712; and the air conditioner also includes high and low pressure pipes and a branch pipe 730 branched from the discharge pipe 711, the high and low pressure pipe 620 connects the first intersection of the liquid pipe 610, one or more indoor heat exchangers and the branch pipe 730 in sequence, wherein the first intersection is located between the indoor heat exchanger and the outdoor heat exchanger 750.

[0118] In some embodiments, in order to improve the flexibility of the system, the air conditioner further includes a first switch 740, which can switch between a first switching state of the first switch 740 and a second switching state of the first switch 740.

[0119] In the first switching state, the first switch 740 connects the liquid pipe with the suction pipe 712 and connects the gas pipe with the discharge pipe 711;

[0120] In the second switching state, the first switch 740 connects the liquid pipe with the discharge pipe 711 and connects the gas pipe with the suction pipe 712; and / or,

[0121] The air conditioner further comprises a second switch 760, which can be switched between a third switching state and a fourth switching state of the second switch 760. In the third switching state, the second switch 760 enables the high-low pressure pipe to communicate with the bifurcated pipe 730; in the fourth switching state, the second switch 760 enables the high-low pressure pipe to communicate with the suction pipe 712. Also connected to the second switch 760 is an auxiliary branch pipe 780. When the high-low pressure pipe is communicated with the bifurcated pipe 730, the auxiliary branch pipe 780 is communicated with the suction pipe 712; when the high-low pressure pipe is communicated with the suction pipe 712, the auxiliary branch pipe 780 communicates with the suction pipe 712 and the bifurcated pipe 730.

[0122] Based on all the above refrigerant pipeline implementation examples, the following describes a control method for an air conditioner so that the air conditioner can be appropriately and accurately controlled according to user needs, thereby meeting user needs in a timely and accurate manner.

[0123] The control method of the air conditioner comprises:

[0124] Obtain the target temperature and the current indoor ambient temperature, and calculate the difference between the current indoor ambient temperature and the target temperature, which is recorded as the target temperature difference;

[0125] Specifically, in this embodiment, there are many ways to obtain the current indoor ambient temperature and the target temperature. For example, the current indoor ambient temperature can be detected by the temperature sensor on the air conditioner, or it can be obtained from other household appliances or terminals; the target temperature can be obtained from the control instruction sent by the user, or it can be retrieved from pre-stored data, and of course, it can also come from other terminal devices. After obtaining the current indoor ambient temperature and the target temperature, the difference between the two is calculated to obtain the target temperature difference, that is, the difference between the current temperature and the target temperature. In heating mode, the indoor temperature is usually lower than the target temperature, and the target temperature difference is less than 0; in cooling mode, the indoor temperature is usually higher than the target temperature, and the target temperature difference is greater than 0.

[0126] Confirm that the target temperature difference is less than or equal to the first preset temperature difference, and all indoor heat exchangers are in heating mode, wherein the first preset temperature difference is less than 0; and / or,

[0127] When the target temperature difference is less than or equal to a first preset temperature difference less than 0, it means that the current indoor temperature is much lower than the target temperature, and a large amount of heat is needed to quickly meet the user's heat demand. At this time, all indoor heat exchangers are heated to ensure that the indoor ambient temperature can rise quickly, thereby quickly meeting the user's needs. Among them, the first preset temperature difference can be -2.5℃~-3.5℃, taking -3℃ as an example.

[0128] Confirm that the target temperature difference is greater than or equal to the second preset temperature difference, and all indoor heat exchangers are in cooling mode, wherein the second preset temperature difference is greater than 0; and / or,

[0129] When the target temperature difference is greater than or equal to a second preset temperature difference greater than 0, it means that the current indoor temperature is much higher than the target temperature, and a large amount of cooling is required to quickly meet the user's cooling needs. At this time, all indoor heat exchangers are cooled to ensure that the indoor ambient temperature can drop quickly, thereby quickly meeting the user's needs. The second preset temperature difference can be 2.5℃~3.5℃, taking 3℃ as an example.

[0130] Confirm that the target temperature difference is greater than the first preset temperature difference and less than the second preset temperature difference, and control the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to cool, heat or shut down according to the value of the target temperature difference; wherein the first preset temperature difference is less than 0, and the second preset temperature difference is greater than 0.

[0131] When the target temperature difference is between the first preset temperature difference and the second preset temperature difference, it means that the current indoor temperature is not much different from the target temperature. At this time, while considering providing cooling and heating for the user, factors such as humidity should also be considered so that the user's cooling and heating needs can be met, and the requirements of humidity and other factors can also be met. Whether the indoor heat exchanger provides cooling or heating, and how much heat or cooling it provides, is determined according to the working conditions.

[0132] Among them, the first preset temperature difference can be -2.5℃~-3.5℃, taking -3℃ as an example, and the second preset temperature difference can be 2.5℃~3.5℃, taking 3℃ as an example; in this way, when the target temperature difference is between -3℃~3℃, it is necessary to consider the adjustment of air parameters other than temperature, such as humidity adjustment.

[0133] The situations of controlling the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 according to the value of the target temperature difference may include the following: partial cooling and the remaining part heating, or partial cooling and the remaining part closed, or partial heating and the remaining part closed, or partial cooling, partial heating and partial closing.

[0134] In order to further more accurately control the temperature adjustment and humidity adjustment to improve the user's comfort, the step of controlling the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to cool, heat or shut down according to the value of the target temperature difference specifically includes:

[0135] Confirm that the target temperature difference is less than or equal to the third preset temperature difference; obtain the current relative humidity in the room, and control one or more of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 for heating according to the current relative humidity; wherein the third preset temperature difference is less than 0 and greater than the first preset temperature difference; and / or,

[0136] Specifically, in this embodiment, when the target temperature difference is less than or equal to the third preset temperature difference and greater than the first preset temperature difference, it means that under the heating condition, the current ambient temperature needs to continue to rise, but not too fast, and the heat required per unit time is less than when the heating starts. At this time, the user's humidity requirements can be considered. The third preset temperature difference can be -1.5°C to -0.5°C, taking -1°C as an example.

[0137] When the humidity is too high, dehumidification is required while heating up. When the humidity is not too high, only heating up is required to meet the needs of users. The following is a detailed description.

[0138] Only need to heat up:

[0139] The step of controlling one or more of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to heat according to the current relative humidity specifically includes:

[0140] Compare current relative humidity with preset humidity;

[0141] It is confirmed that the current relative humidity is less than the preset humidity, and one or two of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 are controlled to heat, and the others are turned off.

[0142] Specifically, in this embodiment, the current relative humidity is less than the preset humidity, which means that the humidity of the current environment is not particularly high and will not affect the user experience. At this time, the air conditioner only increases the temperature without dehumidifying. As for whether to turn on one or two for heating, it needs to be determined according to the specific situation. If the current temperature is still far from the target temperature, for example, the target temperature difference is -3℃~-2℃, then turn on two indoor heat exchangers for heating; if the current temperature is already far from the target temperature, for example, the target temperature difference is -2℃~-1℃, then turn on one indoor heat exchanger for heating. The preset humidity can be 60%~80%, taking 70% as an example.

[0143] Situations where both heating and dehumidification are required:

[0144] Confirm that the current relative humidity is greater than or equal to the preset humidity, control one of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to cool, and the other two to heat; at this time, the indoor heat exchanger for cooling is needed for dehumidification, and the indoor heat exchanger for heating is needed for heating.

[0145] Considering the specific arrangement of each indoor heat exchanger, determine the specific heating and cooling heat exchangers.

[0146] The housing 100 of the air conditioner indoor unit has an air inlet, an air outlet, and an air duct connecting the air inlet and the air outlet, and a plurality of indoor heat exchangers are arranged in the air duct, the first indoor heat exchanger 310 and the first indoor heat exchanger 320 are arranged near the air inlet, and the third indoor heat exchanger 330 is arranged on a side of the first indoor heat exchanger 320 facing away from the air inlet;

[0147] Confirming that the current relative humidity is greater than or equal to the preset humidity, controlling one of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to cool, and the other two steps of heating include:

[0148] The first indoor heat exchanger 310 and the third indoor heat exchanger 330 are controlled to perform heating, and the first indoor heat exchanger 320 is controlled to perform cooling.

[0149] Specifically, in this embodiment, because the third indoor heat exchanger 330 is located on the side of the first indoor heat exchanger 320 facing away from the air inlet, when the air enters the air duct from the air inlet, it first exchanges heat with the first indoor heat exchanger 320 to cool and dehumidify, and then passes through the third indoor heat exchanger 330 to increase the temperature; during this process, the first indoor heat exchanger 310 is always heating. In this way, dehumidification and reheating can be achieved in the first indoor heat exchanger 320 and the third indoor heat exchanger 330, and heating and temperature increase can be achieved through the first indoor heat exchanger 310.

[0150] In the case of four indoor heat exchangers, specific heating and cooling heat exchangers are determined in consideration of the specific arrangement of each indoor heat exchanger.

[0151] The air conditioner indoor unit further includes a fourth indoor heat exchanger 340, which is connected in parallel with the first indoor heat exchanger 320; the housing 100 of the air conditioner indoor unit has an air inlet, an air outlet, and an air duct connecting the air inlet and the air outlet, and a plurality of indoor heat exchangers are arranged in the air duct, the first indoor heat exchanger 310 and the first indoor heat exchanger 320 are arranged close to the air inlet, the third indoor heat exchanger 330 is arranged on a side of the first indoor heat exchanger 320 facing away from the air inlet, and the fourth indoor heat exchanger 340 is arranged on a side of the first indoor heat exchanger 310 facing away from the air inlet;

[0152] The step of controlling one or more of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to heat according to the current relative humidity specifically includes:

[0153] The first indoor heat exchanger 310 or the first indoor heat exchanger 320 is controlled to cool, and the third indoor heat exchanger 330 and the fourth indoor heat exchanger 340 are controlled to heat.

[0154] When there are four indoor heat exchangers, and the third indoor heat exchanger 330 is located on the side of the first indoor heat exchanger 320 away from the air inlet, and the fourth indoor heat exchanger 340 is located on the side of the first indoor heat exchanger 310 away from the air inlet, taking the splicing in a diamond shape as an example, at this time, whether the first indoor heat exchanger 310 is cooling or the first indoor heat exchanger 320 is cooling, the air can be dehumidified, and the dehumidified air must be reheated by the third indoor heat exchanger 330 and / or the fourth indoor heat exchanger 340.

[0155] Confirm that the target temperature difference is greater than or equal to the fourth preset temperature difference, obtain the current relative humidity in the room, and control the refrigeration of one or more of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 according to the current relative humidity; wherein the fourth preset temperature difference is greater than zero and less than the second preset temperature difference.

[0156] Specifically, in this embodiment, when the target temperature difference is greater than or equal to the fourth preset temperature difference and less than the second preset temperature difference, it means that under the cooling condition, the current ambient temperature needs to continue to decrease, but not too fast, and the cooling capacity required per unit time is less than when cooling starts. At this time, the user's humidity requirements can be considered. The fourth preset temperature difference can be 1.5°C to 0.5°C, taking 1°C as an example.

[0157] When the humidity is too high, dehumidification is required while lowering the temperature. When the humidity is not too high, not only cooling is required, but also attention should be paid to the user experience, and the temperature should not drop too quickly. The following is a detailed explanation.

[0158] When only cooling is needed:

[0159] The step of controlling the cooling of one or more of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 according to the current relative humidity specifically includes:

[0160] It is confirmed that the current relative humidity is less than the preset humidity, and one or two of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 are controlled to cool, and the others are turned off.

[0161] Specifically, in this embodiment, the current relative humidity is less than the preset humidity, which means that the humidity of the current environment is not particularly high and will not affect the user experience. As for whether to turn on one or two for cooling, it needs to be determined according to the specific situation. If the current temperature is still far from the target temperature, for example, the target temperature difference is 3℃~2℃, then turn on two indoor heat exchangers for cooling; if the current temperature is already far from the target temperature, for example, the target temperature difference is 2℃~1℃, then turn on one indoor heat exchanger for cooling. The preset humidity can be 60%~80%, taking 70% as an example.

[0162] Situations where both cooling and comfort are required:

[0163] Confirm that the current relative humidity is greater than or equal to the preset humidity, control one of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to heat, and the other two to cool; at this time, the indoor heat exchanger for cooling is needed to dehumidify, and the indoor heat exchanger for heating is needed to heat up, so as to improve the user's comfort.

[0164] Considering the specific arrangement of each indoor heat exchanger, determine the specific heating and cooling heat exchangers.

[0165] The housing 100 of the air conditioner indoor unit has an air inlet, an air outlet, and an air duct connecting the air inlet and the air outlet, and a plurality of indoor heat exchangers are arranged in the air duct, the first indoor heat exchanger 310 and the first indoor heat exchanger 320 are arranged near the air inlet, and the third indoor heat exchanger 330 is arranged on a side of the first indoor heat exchanger 320 facing away from the air inlet;

[0166] Confirming that the current relative humidity is greater than or equal to the preset humidity, controlling one of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to heat, and the other two to cool specifically include:

[0167] The first indoor heat exchanger 310 and the first indoor heat exchanger 320 are controlled to cool, and the third indoor heat exchanger 330 is controlled to heat.

[0168] Specifically, in this embodiment, because the third indoor heat exchanger 330 is located on the side of the first indoor heat exchanger 320 facing away from the air inlet, when the air enters the air duct from the air inlet, it first exchanges heat with the first indoor heat exchanger 320 to cool and dehumidify, and then reheats through the third indoor heat exchanger 330; during this process, the first indoor heat exchanger 310 always cools. In this way, dehumidification and reheating can be achieved in the first indoor heat exchanger 320 and the third indoor heat exchanger 330, and cooling and cooling can be achieved through the first indoor heat exchanger 310.

[0169] Confirm that the target temperature difference is greater than the third preset temperature difference and less than the fourth preset temperature difference, the first indoor heat exchanger 310 is cooling and one of the first indoor heat exchanger 320 is cooling, the other is heating, and the third heat exchanger is turned off; wherein, the third preset temperature difference is less than 0 and greater than the first preset temperature difference; the fourth preset temperature difference is greater than zero and less than the second preset temperature difference; take the target temperature difference of -1°C to 1°C as an example.

[0170] Specifically, in this embodiment, when the target temperature difference is between the third preset temperature difference and the fourth preset temperature difference, it means that the current ambient temperature is very close to the target temperature, or even within the range in which the target temperature fluctuates. At this time, the indoor heat exchanger only needs to compensate a very small amount of cooling or heat according to the fluctuation. In this case, one indoor heat exchanger is turned on for cooling and one indoor heat exchanger is turned on for heating. As for the relationship between the cooling capacity and the heating capacity, it can be appropriately adjusted according to actual needs.

[0171] In the above embodiment, how to realize the closing, cooling, and heating of the first indoor heat exchanger 310 to the fourth indoor heat exchanger 340 is described below through an embodiment:

[0172] The first port is connected to the liquid pipe of the air conditioner through the first refrigerant pipe 313, and the first indoor throttling device 314 is provided on the first refrigerant pipe 313; and / or,

[0173] The second port is connected to the high and low pressure pipes of the air conditioner through the first connecting pipe, and the first connecting pipe is provided with a first control valve 316; the second port is connected to the air pipe of the air conditioner through the second connecting pipe, and the second connecting pipe is provided with a second control valve 318; and / or,

[0174] The fourth port is connected to the high and low pressure pipes of the air conditioner through the third connecting pipe, and the third connecting pipe is provided with a third control valve 326; the fourth port is connected to the air pipe of the air conditioner through the fourth connecting pipe, and the fourth connecting pipe is provided with a fourth control valve 327; and / or,

[0175] The sixth port is connected to the high and low pressure pipes of the air conditioner through the fifth connecting pipe, and the fifth connecting pipe is provided with a fifth control valve 336; the sixth port is connected to the air pipe of the air conditioner through the sixth connecting pipe, and the sixth connecting pipe is provided with a sixth control valve 337; and / or,

[0176] The air conditioner indoor unit further comprises a fourth indoor heat exchanger 340, wherein the fourth indoor heat exchanger 340 has a seventh port and an eighth port for refrigerant to enter or flow out of the fourth indoor heat exchanger 340; the seventh port is connected to the liquid pipe through a fourth refrigerant pipe, and a fourth indoor throttling device is provided on the fourth refrigerant pipe; the eighth port is configured to be connected to the high-low pressure pipe or the gas pipe; the eighth port is connected to the high-low pressure pipe through a seventh connecting pipe, and a seventh control valve 346 is provided on the seventh connecting pipe; and / or the eighth port is connected to the gas pipe through an eighth connecting pipe, and an eighth control valve 347 is provided on the eighth connecting pipe;

[0177] The method of closing the first indoor heat exchanger 310 includes closing the first indoor throttling device 314, and / or closing the first control valve 316 and the second control valve 318; and / or,

[0178] The method of closing the first indoor heat exchanger 320 includes closing the second indoor throttling device, and / or closing the third control valve 326 and the fourth control valve 327; and / or,

[0179] The method of closing the third indoor heat exchanger 330 includes closing the third indoor throttling device, and / or closing the fifth control valve 336 and the sixth control valve 337; and / or,

[0180] The method of closing the fourth indoor heat exchanger 340 includes closing the fourth indoor throttling device, and / or closing the seventh control valve 346 and the eighth control valve 347.

[0181] See the table below for details:

[0182] Table 1, working state table of each first indoor throttling device 314 to the fourth indoor throttling device, and the first control valve 316 to the eighth control valve 347 when the first indoor heat exchanger 310 to the fourth indoor heat exchanger 340 are closed, heated, and cooled

[0183]

[0184] The present invention further proposes an air conditioner, the air conditioner comprising a memory, a processor, and a control program of the air conditioner stored in the memory and executable by the processor, wherein the control program of the air conditioner implements various steps of a control method of the air conditioner when executed by the processor. The control method of the air conditioner comprises:

[0185] Obtain the target temperature and the current indoor ambient temperature, and calculate the difference between the current indoor ambient temperature and the target temperature, which is recorded as the target temperature difference;

[0186] Confirm that the target temperature difference is less than or equal to the first preset temperature difference, and all indoor heat exchangers are in heating mode, wherein the first preset temperature difference is less than 0; and / or,

[0187] Confirm that the target temperature difference is greater than or equal to the second preset temperature difference, and all indoor heat exchangers are in cooling mode, wherein the second preset temperature difference is greater than 0; and / or,

[0188] Confirm that the target temperature difference is greater than the first preset temperature difference and less than the second preset temperature difference, and control the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to cool, heat or shut down according to the value of the target temperature difference; wherein the first preset temperature difference is less than 0, and the second preset temperature difference is greater than 0.

[0189] Optionally, the step of controlling the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to cool, heat or shut down according to the value of the target temperature difference specifically includes:

[0190] According to the value of the target temperature difference, the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 are controlled to partially cool and partially heat, or partially cool and partially close, or partially heat and partially close, or partially cool, partially heat and partially close.

[0191] Optionally, the step of controlling the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to cool, heat or shut down according to the value of the target temperature difference specifically includes:

[0192] Confirm that the target temperature difference is greater than the third preset temperature difference and less than the fourth preset temperature difference, the first indoor heat exchanger 310 cools and one of the first indoor heat exchanger 320 cools, the other heats, and the third heat exchanger is turned off; wherein the third preset temperature difference is less than 0 and greater than the first preset temperature difference; the fourth preset temperature difference is greater than zero and less than the second preset temperature difference; and / or,

[0193] Confirm that the target temperature difference is less than or equal to the third preset temperature difference; obtain the current relative humidity in the room, and control one or more of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 for heating according to the current relative humidity; wherein the third preset temperature difference is less than 0 and greater than the first preset temperature difference; and / or,

[0194] Confirm that the target temperature difference is greater than or equal to the fourth preset temperature difference, obtain the current relative humidity in the room, and control the refrigeration of one or more of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 according to the current relative humidity; wherein the fourth preset temperature difference is greater than zero and less than the second preset temperature difference.

[0195] Optionally, the step of controlling one or more of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to heat according to the current relative humidity specifically includes:

[0196] Compare current relative humidity with preset humidity;

[0197] Confirm that the current relative humidity is greater than or equal to the preset humidity, control one of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to cool, and the other two to heat; and / or,

[0198] It is confirmed that the current relative humidity is less than the preset humidity, and one or two of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 are controlled to heat, and the others are turned off.

[0199] Optionally, the housing 100 of the air conditioner indoor unit has an air inlet, an air outlet, and an air duct connecting the air inlet and the air outlet, and a plurality of indoor heat exchangers are arranged in the air duct, the first indoor heat exchanger 310 and the first indoor heat exchanger 320 are arranged near the air inlet, and the third indoor heat exchanger 330 is arranged on a side of the first indoor heat exchanger 320 facing away from the air inlet;

[0200] Confirming that the current relative humidity is greater than or equal to the preset humidity, controlling one of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to cool, and the other two steps of heating include:

[0201] The first indoor heat exchanger 310 and the third indoor heat exchanger 330 are controlled to perform heating, and the first indoor heat exchanger 320 is controlled to perform cooling.

[0202] Optionally, the air conditioner indoor unit further includes a fourth indoor heat exchanger 340, and the fourth indoor heat exchanger 340 is connected in parallel with the first indoor heat exchanger 320; the housing 100 of the air conditioner indoor unit has an air inlet, an air outlet, and an air duct connecting the air inlet and the air outlet, and a plurality of indoor heat exchangers are arranged in the air duct, the first indoor heat exchanger 310 and the first indoor heat exchanger 320 are arranged near the air inlet, the third indoor heat exchanger 330 is arranged on the side of the first indoor heat exchanger 320 facing away from the air inlet, and the fourth indoor heat exchanger 340 is arranged on the side of the first indoor heat exchanger 310 facing away from the air inlet;

[0203] The step of controlling one or more of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to heat according to the current relative humidity specifically includes:

[0204] The first indoor heat exchanger 310 or the first indoor heat exchanger 320 is controlled to cool, and the third indoor heat exchanger 330 and the fourth indoor heat exchanger 340 are controlled to heat.

[0205] Optionally, the step of controlling the refrigeration of one or more of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 according to the current relative humidity specifically includes:

[0206] Compare current relative humidity with preset humidity;

[0207] Confirm that the current relative humidity is greater than or equal to the preset humidity, control one of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to heat, and the other two to cool; and / or,

[0208] It is confirmed that the current relative humidity is less than the preset humidity, and one or two of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 are controlled to cool, and the others are turned off.

[0209] Optionally, the housing 100 of the air conditioner indoor unit has an air inlet, an air outlet, and an air duct connecting the air inlet and the air outlet, and a plurality of indoor heat exchangers are arranged in the air duct, the first indoor heat exchanger 310 and the first indoor heat exchanger 320 are arranged near the air inlet, and the third indoor heat exchanger 330 is arranged on a side of the first indoor heat exchanger 320 facing away from the air inlet;

[0210] Confirming that the current relative humidity is greater than or equal to the preset humidity, controlling one of the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to heat, and the other two to cool specifically include:

[0211] The first indoor heat exchanger 310 and the first indoor heat exchanger 320 are controlled to cool, and the third indoor heat exchanger 330 is controlled to heat.

[0212] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A control method for an air conditioner, the air conditioner comprising an air conditioner indoor unit, characterized in that: The indoor unit of the air conditioner includes at least three indoor heat exchangers, namely a first indoor heat exchanger, a second indoor heat exchanger and a third indoor heat exchanger, wherein: The first indoor heat exchanger has a first port and a second port for refrigerant to enter or flow out of the first indoor heat exchanger, the first port is configured to communicate with a liquid pipe of the air conditioner, and the second port is configured to communicate with high and low pressure pipes of the air conditioner and / or is configured to communicate with an air pipe of the air conditioner; The second indoor heat exchanger has a third port and a fourth port for refrigerant to enter or flow out of the second indoor heat exchanger, the third port is configured to communicate with the liquid pipe of the air conditioner, and the fourth port is configured to communicate with the high and low pressure pipes of the air conditioner and / or is configured to communicate with the air pipe of the air conditioner; the third port is connected to the liquid pipe of the air conditioner through the second refrigerant pipe, and the second refrigerant pipe is provided with a second indoor throttling device; The third indoor heat exchanger has a fifth port and a sixth port for refrigerant to enter or flow out of the third indoor heat exchanger, the fifth port is configured to communicate with the liquid pipe of the air conditioner, and the sixth port is configured to communicate with the high and low pressure pipes of the air conditioner and / or is configured to communicate with the air pipe of the air conditioner; the fifth port is connected to the liquid pipe of the air conditioner through the third refrigerant pipe, and the third refrigerant pipe is provided with a third indoor throttling device; The control method of the air conditioner comprises: Obtain the target temperature and the current indoor ambient temperature, and calculate the difference between the current indoor ambient temperature and the target temperature, which is recorded as the target temperature difference; Confirm that the target temperature difference is less than or equal to the first preset temperature difference, and all indoor heat exchangers are in heating mode, wherein the first preset temperature difference is less than 0; and / or, Confirm that the target temperature difference is greater than or equal to the second preset temperature difference, and all indoor heat exchangers are in cooling mode, wherein the second preset temperature difference is greater than 0; and / or, Confirm that the target temperature difference is greater than the first preset temperature difference and less than the second preset temperature difference, and control the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to cool, heat or turn off according to the value of the target temperature difference; wherein the first preset temperature difference is less than 0 and the second preset temperature difference is greater than 0; The step of controlling the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to cool, heat or turn off according to the value of the target temperature difference specifically includes: Confirm that the target temperature difference is greater than the third preset temperature difference and less than the fourth preset temperature difference, the first indoor heat exchanger cools and one of the second indoor heat exchangers cools, the other heats, and the third heat exchanger is turned off; wherein the third preset temperature difference is less than 0 and greater than the first preset temperature difference; the fourth preset temperature difference is greater than zero and less than the second preset temperature difference; and / or, Confirm that the target temperature difference is less than or equal to a third preset temperature difference; obtain the current relative humidity in the room, and control one or more of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger for heating according to the current relative humidity; wherein the third preset temperature difference is less than 0 and greater than the first preset temperature difference; and / or, Confirm that the target temperature difference is greater than or equal to a fourth preset temperature difference, obtain the current relative humidity in the room, and control the refrigeration of one or more of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger according to the current relative humidity; wherein the fourth preset temperature difference is greater than zero and less than the second preset temperature difference.

2. The air conditioner control method according to claim 1, characterized in that: The step of controlling the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to cool, heat or turn off according to the value of the target temperature difference specifically includes: According to the value of the target temperature difference, the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are controlled to partially cool and the remaining part heat, or partially cool and the remaining part is closed, or partially heat and the remaining part is closed, or partially cool, partially heat and partially close.

3. The air conditioner control method according to claim 1, characterized in that: The step of controlling one or more of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger for heating according to the current relative humidity specifically includes: Compare current relative humidity with preset humidity; Confirm that the current relative humidity is greater than or equal to the preset humidity, control one of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to cool, and the other two to heat; and / or, It is confirmed that the current relative humidity is less than the preset humidity, and one or two of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are controlled to heat, and the others are turned off.

4. The air conditioner control method according to claim 3, characterized in that: The housing of the air conditioner indoor unit has an air inlet, an air outlet, and an air duct connecting the air inlet and the air outlet, and a plurality of indoor heat exchangers are arranged in the air duct, the first indoor heat exchanger and the second indoor heat exchanger are arranged near the air inlet, and the third indoor heat exchanger is arranged on a side of the second indoor heat exchanger facing away from the air inlet; The steps of confirming that the current relative humidity is greater than or equal to the preset humidity, controlling one of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to cool, and the other two to heat include: The first indoor heat exchanger and the third indoor heat exchanger are controlled to provide heating, and the second indoor heat exchanger is controlled to provide cooling.

5. The air conditioner control method according to claim 1, characterized in that: The air conditioner indoor unit further includes a fourth indoor heat exchanger, which is connected in parallel with the second indoor heat exchanger; the housing of the air conditioner indoor unit has an air inlet, an air outlet, and an air duct connecting the air inlet and the air outlet, and a plurality of indoor heat exchangers are arranged in the air duct, the first indoor heat exchanger and the second indoor heat exchanger are arranged near the air inlet, the third indoor heat exchanger is arranged on a side of the second indoor heat exchanger facing away from the air inlet, and the fourth indoor heat exchanger is arranged on a side of the first indoor heat exchanger facing away from the air inlet; The step of controlling one or more of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger for heating according to the current relative humidity specifically includes: The first indoor heat exchanger or the second indoor heat exchanger is controlled to cool, and the third indoor heat exchanger and the fourth indoor heat exchanger are controlled to heat.

6. The air conditioner control method according to claim 1, characterized in that: The step of controlling the refrigeration of one or more of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger according to the current relative humidity specifically includes: Compare current relative humidity with preset humidity; Confirming that the current relative humidity is greater than or equal to the preset humidity, controlling one of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to heat, and the other two to cool; and / or, It is confirmed that the current relative humidity is less than the preset humidity, and one or two of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are controlled to cool, and the others are turned off.

7. The air conditioner control method according to claim 6, characterized in that: The housing of the air conditioner indoor unit has an air inlet, an air outlet, and an air duct connecting the air inlet and the air outlet, and a plurality of indoor heat exchangers are arranged in the air duct, the first indoor heat exchanger and the second indoor heat exchanger are arranged near the air inlet, and the third indoor heat exchanger is arranged on a side of the second indoor heat exchanger facing away from the air inlet; Confirming that the current relative humidity is greater than or equal to the preset humidity, controlling one of the first indoor heat exchanger, the second indoor heat exchanger, and the third indoor heat exchanger to heat, and the other two to cool specifically include: The first indoor heat exchanger and the second indoor heat exchanger are controlled to cool, and the third indoor heat exchanger is controlled to heat.

8. The air conditioner control method according to any one of claims 1 to 7, characterized in that: The first port is connected to the liquid pipe of the air conditioner through a first refrigerant pipe, and a first indoor throttling device is provided on the first refrigerant pipe; and / or, The second port is connected to the high and low pressure pipes of the air conditioner through a first connecting pipe, and a first control valve is provided on the first connecting pipe; the second port is connected to the air pipe of the air conditioner through a second connecting pipe, and a second control valve is provided on the second connecting pipe; and / or, The fourth port is connected to the high and low pressure pipes of the air conditioner through the third connecting pipe, and the third connecting pipe is provided with a third control valve; the fourth port is connected to the air pipe of the air conditioner through the fourth connecting pipe, and the fourth connecting pipe is provided with a fourth control valve; and / or, The sixth port is connected to the high and low pressure pipes of the air conditioner through the fifth connecting pipe, and the fifth connecting pipe is provided with a fifth control valve; the sixth port is connected to the air pipe of the air conditioner through the sixth connecting pipe, and the sixth connecting pipe is provided with a sixth control valve; and / or, The air conditioner indoor unit further comprises a fourth indoor heat exchanger, wherein the fourth indoor heat exchanger has a seventh port and an eighth port for refrigerant to enter or flow out of the fourth indoor heat exchanger; the seventh port is connected to the liquid pipe through a fourth refrigerant pipe, and a fourth indoor throttling device is arranged on the fourth refrigerant pipe; The eighth port is configured to be connected to the high- and low-pressure pipes or the air pipe; the eighth port is connected to the high- and low-pressure pipes through the seventh connecting pipe, and the seventh connecting pipe is provided with a seventh control valve; and / or the eighth port is connected to the air pipe through the eighth connecting pipe, and the eighth connecting pipe is provided with an eighth control valve; The method of closing the first indoor heat exchanger includes closing the first indoor throttling device, and / or closing the first control valve and the second control valve; and / or, The method of closing the second indoor heat exchanger includes closing the second indoor throttling device, and / or closing the third control valve and the fourth control valve; and / or, The method of closing the third indoor heat exchanger includes closing the third indoor throttling device, and / or closing the fifth control valve and the sixth control valve; and / or, The method of closing the fourth indoor heat exchanger includes closing the fourth indoor throttling device, and / or closing the seventh control valve and the eighth control valve.

9. An air conditioner, characterized in that: The air conditioner includes a memory, a processor, and a control program of the air conditioner stored in the memory and executable on the processor. When the control program of the air conditioner is executed by the processor, each step of the control method of the air conditioner as described in any one of claims 1 to 8 is implemented.

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