CN112797659A

CN112797659A - Air conditioner and control method thereof

Info

Publication number: CN112797659A
Application number: CN201911035861.2A
Authority: CN
Inventors: 王正兴; 黎顺全; 雷俊杰; 陶骙
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2021-05-14

Abstract

The invention discloses an air conditioner and a control method thereof, wherein the control method of the air conditioner comprises the following steps: acquiring a target temperature and a current indoor environment temperature, calculating a difference value between the current indoor environment temperature and the target temperature, and recording as a target temperature difference; confirming that the target temperature difference is smaller than or equal to a first preset temperature difference, and all indoor heat exchangers are heated completely, wherein the first preset temperature difference is smaller than 0; and/or confirming that the target temperature difference is greater than or equal to a second preset temperature difference, and refrigerating all the indoor heat exchangers, 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 refrigerate, heat or close according to the value of the target temperature difference; the first preset temperature difference is less than 0, and the second preset temperature difference is greater than 0. The technical scheme of the invention improves the adaptability of the air conditioner.

Description

Air conditioner and control method thereof

Technical Field

The invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method thereof.

Background

Along with the improvement of living standard of people, people are more and more common to the use of air conditioner, and simultaneously, people also put forward higher demand to the air conditioner. The existing air-conditioning indoor unit has the advantages that due to the fixed arrangement of the indoor heat exchanger, the heat exchange area is fixed and not adjustable, so that the adjustable temperature range of the air conditioner is small in the temperature adjusting process, and the requirements of users cannot be met.

Disclosure of Invention

The invention mainly aims to provide a control method of an air conditioner, aiming at improving the adaptability of the air conditioner.

In order to achieve the above object, the present invention provides an indoor unit of an air conditioner, the air conditioner including an indoor unit of an air conditioner, characterized in that the indoor unit of an air conditioner includes at least three indoor heat exchangers, which are a first indoor heat exchanger, a second indoor heat exchanger, and a third indoor heat exchanger, respectively,

the first indoor heat exchanger is provided with a first through hole and a second through hole for allowing refrigerant to enter or flow out of the first indoor heat exchanger, the first through hole is configured to be communicated with a liquid pipe of the air conditioner, and the second through hole is configured to be communicated with a high-low pressure pipe of the air conditioner and/or configured to be communicated with an air pipe of the air conditioner;

the second indoor heat exchanger is provided with a third through hole and a fourth through hole for allowing refrigerant to enter or flow out of the second indoor heat exchanger, the third through hole is configured to be communicated with a liquid pipe of the air conditioner, and the fourth through hole is configured to be communicated with a high-low pressure pipe of the air conditioner and/or configured to be communicated with an air pipe of the air conditioner; the third through hole is communicated with a liquid pipe of the air conditioner through a second refrigerant pipe, and a second indoor throttling device is arranged on the second refrigerant pipe;

the third indoor heat exchanger is provided with a fifth through hole and a sixth through hole for allowing refrigerant to enter or flow out of the third indoor heat exchanger, the fifth through hole is configured to be communicated with a liquid pipe of the air conditioner, and the sixth through hole is configured to be communicated with a high-low pressure pipe of the air conditioner and/or configured to be communicated with an air pipe of the air conditioner; the fifth through hole is communicated with a liquid pipe of the air conditioner through a third refrigerant pipe, and a third indoor throttling device is arranged on the third refrigerant pipe;

the control method of the air conditioner comprises the following steps:

acquiring a target temperature and a current indoor environment temperature, calculating a difference value between the current indoor environment temperature and the target temperature, and recording as a target temperature difference;

confirming that the target temperature difference is smaller than or equal to a first preset temperature difference, and all indoor heat exchangers are heated completely, wherein the first preset temperature difference is smaller than 0; and/or the presence of a gas in the gas,

confirming that the target temperature difference is greater than or equal to a second preset temperature difference, and refrigerating all indoor heat exchangers, wherein the second preset temperature difference is greater than 0; and/or the presence of a gas in the gas,

confirming that the target temperature difference is larger than the first preset temperature difference and smaller 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 refrigerate, heat or close according to the value of the target temperature difference; the first preset temperature difference is less than 0, and the second preset temperature difference is greater than 0.

Optionally, the step of controlling the first indoor heat exchanger, the second indoor heat exchanger, and the third indoor heat exchanger to perform cooling, heating, or closing according to the value of the target temperature difference specifically includes:

and controlling part of refrigeration and part of heating in the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger according to the value of the target temperature difference, or part of refrigeration and part of closing, or part of heating and part of closing, or part of refrigeration and part of heating to close.

confirming that the target temperature difference is larger than a third preset temperature difference and smaller than a fourth preset temperature difference, wherein one of the first indoor heat exchanger and the second indoor heat exchanger refrigerates, the other one of the first indoor heat exchanger and the second indoor heat exchanger heats, and the third heat exchanger is closed; wherein the third preset temperature difference is less than 0 and greater than the first preset temperature difference; the fourth preset temperature difference is larger than zero and smaller than the second preset temperature difference; and/or the presence of a gas in the gas,

confirming that the target temperature difference is less than or equal to a third preset temperature difference; acquiring the current indoor relative humidity, and controlling one or more of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to heat 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 the presence of a gas in the gas,

confirming that the target temperature difference is greater than or equal to a fourth preset temperature difference, acquiring the current indoor relative humidity, and controlling one or more of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to refrigerate according to the current relative humidity; wherein the fourth predetermined temperature difference is greater than zero and less than the second predetermined temperature difference.

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 to produce heat according to the current relative humidity specifically includes:

comparing the current relative humidity with a preset humidity;

confirming that the current relative humidity is greater than or equal to the preset humidity, and controlling one of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to refrigerate and the other two to heat; and/or the presence of a gas in the gas,

and confirming that the current relative humidity is less than the preset humidity, controlling one or two of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to heat, and closing the rest.

Optionally, the casing of the indoor air conditioner unit is provided with an air inlet, an air outlet and an air duct communicated with the air inlet and the air outlet, the 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, and the third indoor heat exchanger is arranged on one side, back to the air inlet, of the second indoor heat exchanger;

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 refrigerate, wherein the other two heating steps comprise:

and controlling the first indoor heat exchanger and the third indoor heat exchanger to heat and controlling the second indoor heat exchanger to refrigerate.

Optionally, the indoor unit of the air conditioner further comprises a fourth indoor heat exchanger, and the fourth indoor heat exchanger is connected with the second indoor heat exchanger in parallel; the shell of the indoor unit of the air conditioner is provided with an air inlet, an air outlet and an air duct communicated with 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 one side, back to the air inlet, of the second indoor heat exchanger, and the fourth indoor heat exchanger is arranged on one side, back to the air inlet, of the first indoor heat exchanger;

the step of controlling one or more of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to heat according to the current relative humidity specifically comprises:

and controlling the first indoor heat exchanger or the second indoor heat exchanger to refrigerate, and controlling the third indoor heat exchanger and the fourth indoor heat exchanger to heat.

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 to refrigerate according to the current relative humidity specifically includes:

comparing the current relative humidity with a preset humidity;

confirming that the current relative humidity is greater than or equal to the preset humidity, and 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 refrigerate; and/or the presence of a gas in the gas,

and confirming that the current relative humidity is less than the preset humidity, controlling one or two of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to refrigerate, and closing the rest.

confirming that the current relative humidity is greater than or equal to the preset humidity, and controlling one of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to heat, wherein the other two refrigeration steps specifically comprise:

and controlling the first indoor heat exchanger and the second indoor heat exchanger to refrigerate and controlling the third indoor heat exchanger to heat.

Optionally, the first through hole is communicated with a liquid pipe of the air conditioner through a first refrigerant pipe, and a first indoor throttling device is arranged on the first refrigerant pipe; and/or the presence of a gas in the gas,

the second through opening is communicated with a high-low pressure pipe of the air conditioner through a first connecting pipe, and a first control valve is arranged on the first connecting pipe; the second through port is communicated with an air pipe of the air conditioner through a second connecting pipe, and a second control valve is arranged on the second connecting pipe; and/or the presence of a gas in the gas,

the fourth through port is communicated with a high-low pressure pipe of the air conditioner through a third connecting pipe, and a third control valve is arranged on the third connecting pipe; the fourth through hole is communicated with an air pipe of the air conditioner through a fourth connecting pipe, and a fourth control valve is arranged on the fourth connecting pipe; and/or the presence of a gas in the gas,

the sixth through hole is communicated with a high-low pressure pipe of the air conditioner through a fifth connecting pipe, and a fifth control valve is arranged on the fifth connecting pipe; the sixth through hole is communicated with an air pipe of the air conditioner through a sixth connecting pipe, and a sixth control valve is arranged on the sixth connecting pipe; and/or the presence of a gas in the gas,

the indoor unit of the air conditioner further comprises a fourth indoor heat exchanger, and the fourth indoor heat exchanger is provided with a seventh through hole and an eighth through hole for allowing the refrigerant to enter or flow out of the fourth indoor heat exchanger; the seventh through hole is communicated with the liquid pipe through a fourth refrigerant pipe, and a fourth indoor throttling device is arranged on the fourth refrigerant pipe; the eighth through port is configured to be communicated with a high-low pressure pipe or an air pipe; the eighth through port is communicated with the high-pressure pipe and the low-pressure pipe through a seventh connecting pipe, and a seventh control valve is arranged on the seventh connecting pipe; and/or the eighth through hole is communicated with the air pipe through an eighth connecting pipe, and an eighth control valve is arranged on the eighth connecting pipe;

the mode of closing the first indoor heat exchanger comprises closing the first indoor throttling device and/or closing the first control valve and the second control valve; and/or the presence of a gas in the gas,

the mode of closing the second indoor heat exchanger comprises closing the second indoor throttling device and/or closing the third control valve and the fourth control valve; and/or the presence of a gas in the gas,

the mode for closing the third indoor heat exchanger comprises closing the third indoor throttling device and/or closing the fifth control valve and the sixth control valve; and/or the presence of a gas in the gas,

the manner 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.

Optionally, the first opening is communicated with a liquid pipe of the air conditioner through a first refrigerant pipe, and a first indoor throttling device is arranged on the first refrigerant pipe.

Optionally, the air conditioner further comprises a first four-way valve, and the liquid pipe is respectively communicated with the first refrigerant pipeline, the second refrigerant pipe and the third refrigerant pipe through the first four-way valve.

Optionally, the second through port is communicated with a high-low pressure pipe of the air conditioner through a first connecting pipe, and a first control valve is arranged on the first connecting pipe;

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

Optionally, the fourth through port is communicated with a high-low pressure pipe of the air conditioner through a third connecting pipe, and a third control valve is arranged on the third connecting pipe;

the fourth through hole is communicated with an air pipe of the air conditioner through a fourth connecting pipe, and a fourth control valve is arranged on the fourth connecting pipe.

Optionally, the sixth through hole is communicated with a high-low pressure pipe of the air conditioner through a fifth connecting pipe, and a fifth control valve is arranged on the fifth connecting pipe;

the sixth through hole is communicated with an air pipe of the air conditioner through a sixth connecting pipe, and a sixth control valve is arranged on the sixth connecting pipe.

Optionally, the second through port is communicated with a high-low pressure pipe of the air conditioner through a first connecting pipe, the fourth through port is communicated with the high-low pressure pipe of the air conditioner through a third connecting pipe, and the sixth through port is communicated with the high-low pressure pipe of the air conditioner through a fifth connecting pipe;

the air conditioner also comprises a second four-way valve, and the high-low pressure pipe is respectively communicated with the first connecting pipe, the third connecting pipe and the fifth connecting pipe through the second four-way valve.

Optionally, the second through port is communicated with an air pipe of the air conditioner through a second connecting pipe, the fourth through port is communicated with the air pipe through a fourth connecting pipe, and the sixth through port is communicated with the air pipe through a sixth connecting pipe;

the air conditioner also comprises a third four-way valve, and the air pipe is respectively communicated with the second connecting pipe, the fourth connecting pipe and the sixth connecting pipe through the third four-way valve.

Alternatively, a plurality of indoor heat exchangers are arranged to form a closed polygon.

Optionally, the indoor unit of the air conditioner further comprises a fourth indoor heat exchanger, and the fourth indoor heat exchanger is connected with the second indoor heat exchanger in parallel;

the first indoor heat exchanger to the fourth indoor heat exchanger are spliced to form a quadrangle.

Optionally, the casing of the indoor unit of the air conditioner is provided with an air inlet, an air outlet, and an air duct communicating the air inlet and the air outlet;

a plurality of indoor heat exchangers are arranged in the air duct, and the indoor heat exchangers and the extending direction of the air duct form an included angle.

Optionally, the air conditioner includes:

an air-conditioning indoor unit;

the outdoor unit of the air conditioner comprises a compression mechanism and an outdoor heat exchanger;

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

an air pipe connecting the one or more indoor heat exchangers and the suction pipe; and the number of the first and second groups,

the air conditioner also comprises a high-low pressure pipe and a branch pipe which is branched from the discharge pipe, wherein the high-low pressure pipe sequentially connects a first intersection point of the liquid pipe, one or more indoor heat exchangers and the branch pipe, and the first intersection point is positioned between the indoor heat exchanger and the outdoor heat exchanger;

wherein, the air-conditioning indoor unit comprises at least three indoor heat exchangers which are respectively a first indoor heat exchanger, a second indoor heat exchanger and a third indoor heat exchanger,

the third indoor heat exchanger is provided with a fifth through hole and a sixth through hole for allowing refrigerant to enter or flow out of the third indoor heat exchanger, the fifth through hole is configured to be communicated with a liquid pipe of the air conditioner, and the sixth through hole is configured to be communicated with a high-low pressure pipe of the air conditioner and/or configured to be communicated with an air pipe of the air conditioner; the fifth through hole is communicated with a liquid pipe of the air conditioner through a third refrigerant pipe, and a third indoor throttling device is arranged on the third refrigerant pipe.

Optionally, the air conditioner further comprises a first switch switchable between a first switch first switching state and a first switch second switching state,

in the first switching state, the first switch communicates the liquid tube with the suction tube and communicates the air tube with the discharge tube;

in the second switching state, the first switch communicates the liquid pipe with the discharge pipe and communicates the air pipe with the suction pipe; and/or the presence of a gas in the gas,

the air conditioner further comprises a second switcher, wherein the second switcher can be switched between a third switching state and a fourth switching state of the second switcher, and in the third switching state, the second switcher enables the high-low pressure pipes to be communicated with the branch pipes; in the fourth switching state, the second switch communicates the high-low pressure pipe with the suction pipe.

The invention also provides an air conditioner, which comprises a memory, a processor and a control program of the air conditioner, wherein the control program of the air conditioner is stored in the memory and can be operated on the processor;

the control method of the air conditioner comprises the following steps:

In the technical scheme of the invention, the first indoor heat exchanger can work firstly, 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 the heat exchanger can be used for completely heating, completely refrigerating and partially heating and refrigerating; therefore, the indoor unit of the air conditioner can realize refrigeration, heating, dehumidification and reheating, and the refrigeration, heating, reheating and dehumidification effects of the indoor heat exchanger can be more finely adjusted through the area adjustment of the indoor heat exchanger, so that the air conditioner can be suitable for more occasions, and the adaptability of the air conditioner is improved; in order to more accurately meet the requirements of users, the technical scheme of the invention includes acquiring a target temperature and a current indoor environment temperature, calculating a difference value between the current indoor environment temperature and the target temperature, and recording the difference value as a target temperature difference; when the target temperature difference is determined to be smaller than or equal to a first preset temperature difference, all indoor heat exchangers are heated completely, wherein the first preset temperature difference is smaller than 0 so as to meet the requirement of a user for quick heating and quickly adjust the indoor temperature to the temperature required by the user; when the target temperature difference is determined to be larger than or equal to a second preset temperature difference, all the indoor heat exchangers are refrigerated, wherein the second preset temperature difference is larger than 0, so that the requirement of a user on quick refrigeration is met, and the indoor temperature is quickly adjusted to the temperature required by the user; when the target temperature difference is determined to be larger than the first preset temperature difference and smaller than the second preset temperature difference, controlling the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to refrigerate, heat or close according to the value of the target temperature difference; the first preset temperature difference is less than 0, and the second preset temperature difference is greater than 0.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural view of an indoor unit of an air conditioner according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

The invention mainly provides an air conditioner indoor unit, which is mainly applied to an air conditioner, so that the air conditioner indoor unit comprises a plurality of parallel indoor heat exchangers, and the total heat exchange area of the indoor heat exchangers can be adjusted according to needs to meet different working condition requirements.

The following will mainly describe a specific structure of the air conditioning indoor unit.

Referring to fig. 1 to 2, in an embodiment of the present invention, the indoor unit of an air conditioner includes at least three indoor heat exchangers, i.e., a first indoor heat exchanger 310, a second indoor heat exchanger 320, and a third indoor heat exchanger 330, wherein,

the first indoor heat exchanger 310 is provided with a first through hole 311 and a second through hole 312 for allowing refrigerant to enter or flow out of the first indoor heat exchanger 310, the first through hole 311 is communicated with a liquid pipe 610 of the air conditioner, and the second through hole 312 is communicated with a high-low pressure pipe 620 of the air conditioner and/or is communicated with a gas pipe 630 of the air conditioner;

the second indoor heat exchanger 320 is provided with a third through hole 321 and a fourth through hole 322 for the refrigerant to enter or flow out of the second indoor heat exchanger 320, the third through hole 321 is communicated with a liquid pipe 610 of the air conditioner, and the fourth through hole 322 is communicated with a high-low pressure pipe 620 of the air conditioner and/or is communicated with a gas pipe 630 of the air conditioner; the third opening 321 is communicated with a liquid pipe 610 of the air conditioner through a second refrigerant pipe 323, and a second indoor throttling device 324 is arranged on the second refrigerant pipe 323;

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

Specifically, in this embodiment, the air conditioning indoor unit includes a plurality of indoor heat exchangers, and three are taken as an example for description. The first opening 311 of the first indoor heat exchanger 310 is communicated with a liquid pipe 610 of the air conditioner, and the second opening 312 is communicated with a high-low pressure pipe 620 or an air pipe 630. When the refrigerant enters the first indoor heat exchanger 310 from the first outlet 311 and flows out of the first indoor heat exchanger 310 from the second outlet 312, the first indoor heat exchanger 310 cools; when the refrigerant enters the first indoor heat exchanger 310 from the second inlet 312 and flows out of the first indoor heat exchanger 310 from the first inlet 311, the first indoor heat exchanger 310 heats. When the first indoor heat exchanger 310 performs cooling, the refrigerant starts from the compressor 710, passes through the outdoor heat exchanger 750, enters the first indoor heat exchanger 310 through the first through hole 311 under the guidance of the liquid pipe 610, flows out of the first indoor heat exchanger 310 through the second through hole 312, returns 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 heats, the refrigerant has two flowing modes, the first mode is that the refrigerant is discharged from the compressor 710, enters the air pipe 630 through the discharge pipe 711, enters the first indoor heat exchanger 310 through the second opening 312, flows out of the first indoor heat exchanger 310 from the first opening 311, 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 second type is that the refrigerant flows out from the compressor 710, flows into the high-low pressure pipe through the discharge pipe 711, enters the first indoor heat exchanger 310 through the second opening 312, flows out of the first indoor heat exchanger 310 through the first opening 311, 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.

Similarly, the third opening 321 of the second indoor heat exchanger 320 is communicated with the liquid pipe 610 of the air conditioner, and the fourth opening 322 is communicated with the high-low pressure pipe 620 or the air pipe 630. When the refrigerant enters the second indoor heat exchanger 320 from the third outlet 321 and flows out of the second indoor heat exchanger 320 from the fourth outlet 322, the second indoor heat exchanger 320 performs cooling; when the refrigerant enters the second indoor heat exchanger 320 through the fourth port 322 and flows out of the second indoor heat exchanger 320 through the third port 321, the second indoor heat exchanger 320 heats. When the second indoor heat exchanger 320 performs cooling, the refrigerant starts from the compressor 710, passes through the outdoor heat exchanger 750, enters the second indoor heat exchanger 320 through the third opening 321, flows out of the second indoor heat exchanger 320 through the fourth opening 322, returns to the gas-liquid separator 720 or the suction pipe 712 through the gas pipe 630, and then returns to the compressor 710 under the guidance of the liquid pipe 610. When the second indoor heat exchanger 320 heats, the refrigerant has two flowing modes, the first mode is that the refrigerant is discharged from the compressor 710, enters the air pipe 630 through the discharge pipe 711, enters the second indoor heat exchanger 320 through the fourth opening 322, flows out of the second indoor heat exchanger 320 through the third opening 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 second type is that the refrigerant flows out of the compressor 710, flows into the high-low pressure pipe through the discharge pipe 711, enters the second indoor heat exchanger 320 through the fourth port 322, flows out of the second indoor heat exchanger 320 through 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 throttle device 324 controls whether the second indoor heat exchanger 320 is engaged.

Similarly, the fifth port 331 of the third indoor heat exchanger 330 communicates with the liquid pipe 610 of the air conditioner, and the sixth port 332 communicates with the high-low pressure pipe 620 or the air 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 refrigeration; 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 generates heat. When the third indoor heat exchanger 330 performs refrigeration, the refrigerant starts from the compressor 710, passes through the outdoor heat exchanger 750, enters the third indoor heat exchanger 330 through the fifth port 331 under the guidance of the liquid pipe 610, flows out of the third indoor heat exchanger 330 through the sixth port 332, returns 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 heats, the refrigerant has two flowing modes, the first mode is that the refrigerant is discharged from the compressor 710, enters the air pipe 630 through the discharge pipe 711, enters the third indoor heat exchanger 330 through the sixth through hole 332, flows out of the third indoor heat exchanger 330 from the fifth through hole 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 second type is that the refrigerant flows out of the compressor 710, flows into the high-low pressure pipe through the discharge pipe 711, enters the third indoor heat exchanger 330 through the sixth port 332, flows out of the third indoor heat exchanger 330 through 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 throttle device 334 controls whether the third indoor heat exchanger 330 participates in the work.

In this way, the first indoor heat exchanger 310 may 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 may be selected to 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 all heating, all cooling and part of heating and part of cooling can be realized; so, machine in the air conditioning can realize refrigeration, heating and dehumidification reheat, and area adjustment through indoor heat exchanger can make the effect of indoor heat exchanger's refrigeration, heating and reheat dehumidification obtain more meticulous adjustment for the air conditioner can be adapted to more occasions, is favorable to improving the adaptability of air conditioner.

In some embodiments, in order to further improve the adaptability of the air conditioner, the first through hole 311 is communicated with a liquid pipe 610 of the air conditioner through a first refrigerant pipe 313, and the first indoor throttling device 314 is disposed on the first refrigerant pipe 313. The first indoor throttling device 314 is disposed on the first refrigerant pipe 313, so that the first indoor heat exchanger 310 may be in a non-operating state, and a position of an operating indoor heat exchanger among the plurality of indoor heat exchangers may be arbitrarily selected according to a requirement.

The opening and closing of the first refrigerant pipe 313, the second refrigerant pipe 323, and the third refrigerant pipe 333 may be controlled by a dedicated control valve in addition to the first throttle device, the second indoor throttle device 324, and the third indoor throttle device 334 for adjusting the flow rate. The air conditioner further includes a first four-way valve through which the liquid pipe 610 is respectively communicated with the first refrigerant pipe 313, the second refrigerant pipe 323, and the third refrigerant pipe 333. In some embodiments, in order to improve the convenience of installing the liquid pipe 610 and the first refrigerant pipe 313, the second refrigerant pipe 323, and the third refrigerant pipe 333 and to improve the compactness, a four-way valve is used to communicate the liquid pipe 610 with the three pipes. At this time, the four-way valve may not have a control function, and only the liquid pipes 610 need to be communicated with the three refrigerant pipes respectively. In 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 may have a function of opening and closing the pipe orifice. For example, three nozzles communicating with the first refrigerant pipe 313, the second refrigerant pipe 323, and the third refrigerant pipe 333 may be opened and closed, respectively.

When the second port 312 is connected to the high-low pressure pipe 620 and the air pipe 630 at the same time, the fourth port 322 is connected to the high-low pressure pipe 620 and the air pipe 630 at the same time, and the sixth port 332 is connected to the high-low pressure pipe 620 and the air pipe 630 at the same time, there are various ways of controlling the first connection pipe 315, the second connection pipe 317, the third connection pipe 325, the fourth connection pipe 327, the fifth connection pipe 335, and the sixth connection pipe 337, respectively. Control valves may be respectively disposed on the first connection pipe 315, the second connection pipe 317, the third connection pipe 325, the fourth connection pipe 327, the fifth connection pipe 335, and the sixth connection pipe 337, or a second four-way valve and a third four-way valve may be respectively disposed.

The second through port 312 is communicated with a high-low pressure pipe 620 of the air conditioner through a first connecting pipe 315, and a first control valve 316 is arranged on the first connecting pipe 315; the second through port 312 is connected to an air pipe 630 of the air conditioner via a second connection pipe 317, and a second control valve 318 is provided on the second connection pipe 317. In this way, the second port 312 is selectively communicated with the high-pressure pipe 620 or the low-pressure pipe 630, so that the working state of the first indoor heat exchanger 310 can be arbitrarily adjusted according to the requirement, and is not affected by the working modes of other indoor heat exchangers. For example, when the overall indoor unit needs to realize the reheating and dehumidifying function, some indoor heat exchangers are needed to heat and some indoor heat exchangers are needed to cool. The second indoor heat exchanger 320 cools air, and the first indoor heat exchanger 310 heats air. As the second indoor heat exchanger 320 performs cooling, the refrigerant passes through the outdoor heat exchanger 750 through the liquid pipe 610, is delivered to the second indoor heat exchanger 320 through the liquid pipe 610 for cooling, and is then delivered back to the suction pipe 712 through the air pipe 630. At this time, the first indoor heat exchanger 310 needs to be heated, and the refrigerant flows from the discharge pipe 711, through the branch pipe 730, into the second port 312 through the high-low pressure pipe 620 and the first connection pipe 315, flows out of the first port 311, enters the liquid pipe 610, and flows into the suction pipe 712 through the liquid pipe 610. During 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 realize a working state that cannot be realized by other heat exchangers, which is beneficial to improving the use occasion of the first indoor heat exchanger 310. When the first indoor heat exchanger 310 cools, the first control valve 316 is closed and the second control valve 318 is opened.

Similarly, the fourth through hole 322 is communicated with a high-low pressure pipe 620 of the air conditioner through a third connecting pipe 325, and the third connecting pipe 325 is provided with a third control valve 326; the fourth through hole 322 is connected to an air pipe 630 of the air conditioner through a fourth connection pipe 327, and a fourth control valve 328 is provided on the fourth connection pipe 327. In this way, the fourth port 322 is selectively communicated with the high-pressure pipe 620 or the low-pressure pipe 630, so that the working state of the second indoor heat exchanger 320 can be arbitrarily adjusted according to the requirement, and is not affected by the working modes of other indoor heat exchangers. When the second indoor heat exchanger 320 cools, the third control valve 326 is opened and/or the fourth control valve 328 is opened; when the second indoor heat exchanger 320 heats, 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.

Similarly, the sixth through hole 332 is communicated with a high-low pressure pipe 620 of the air conditioner through a fifth connecting pipe 335, and the fifth connecting pipe 335 is provided with a fifth control valve 336; the sixth through hole 332 is communicated with an air pipe 630 of the air conditioner through a sixth connection pipe 337, and the sixth connection pipe 337 is provided with a sixth control valve 338. In this way, the fourth port 322 is selectively communicated with the high-pressure pipe 620 or the low-pressure pipe 630, so that the working state of the second indoor heat exchanger 320 can be arbitrarily adjusted according to the requirement, and is not affected by the working modes 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.

The second through port 312 is communicated with a high-low pressure pipe 620 of the air conditioner through a first connecting pipe 315, the fourth through port 322 is communicated with the high-low pressure pipe 620 of the air conditioner through a third connecting pipe 325, and the sixth through port 332 is communicated with the high-low pressure pipe 620 of the air conditioner through a fifth connecting pipe 335; the air conditioner further includes a second four-way valve through which the high-low pressure pipe 620 is respectively communicated with the first connection pipe 315, the third connection pipe 325, and the fifth connection pipe 335.

Specifically, in this embodiment, the high-low pressure pipe 620 communicates with the first connection pipe 315, the third connection pipe and the fifth connection pipe 335 through a second four-way valve, and the ports of the second four-way valve, which are respectively connected with the three connection pipes, can be controlled to open and close. In this manner, the first connection pipe 315, the third connection pipe 325, and the fifth connection pipe 335 can be turned on or off by the second four-way valve. The connection of the high-pressure pipe 620 and the first connection pipe 315, the third connection pipe 325 and the fifth connection pipe 335 is facilitated, and the on-off control of the three connection pipes can be realized conveniently.

The second through port 312 is communicated with an air pipe 630 of the air conditioner through a second connecting pipe 317, the fourth through port 322 is communicated with the air pipe 630 through a fourth connecting pipe 327, and the sixth through port 332 is communicated with the air pipe 630 through a sixth connecting pipe 337; the air conditioner further includes a third four-way valve through which the air pipe 630 is respectively communicated with the second connection pipe 317, the fourth connection pipe 327, and the sixth connection pipe 337.

Specifically, in this embodiment, the air pipe 630 is connected to the first connection pipe 315, the third connection pipe and the fifth connection pipe 335 through a third four-way valve, and the ports of the second four-way valve, which are respectively connected to the three connection pipes, can be controlled to open and close. In this way, the on/off of second connection pipe 317, fourth connection pipe 327, and sixth connection pipe 337 may be controlled by the third four-way valve. While being convenient for connecting air pipe 630 with second connecting pipe 317, fourth connecting pipe 327 and sixth connecting pipe 337, the on-off control of the three connecting pipes can be conveniently realized.

In some embodiments, in order to improve the heat exchange effect of the heat exchanger, a plurality of 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 shape. By such arrangement, not only the compactness of the structure can be improved, but also the installation stability of each heat exchanger can be improved.

When the number of the indoor heat exchangers is four, the indoor unit of the air conditioner further comprises a fourth indoor heat exchanger 340, and the fourth indoor heat exchanger 340 is connected with the second indoor heat exchanger 320 in parallel; the first to fourth indoor heat exchangers 310 to 340 are spliced to form a quadrangle. One refrigerant passage (seventh passage 341) of the fourth heat exchanger may be communicated with the liquid pipe 610 through a fourth refrigerant pipe 343. The other refrigerant passage (eighth passage 342) may be connected to the gas pipe 630 or the high and low pressure pipe 620, the eighth passage 342 may be connected to the high and low pressure pipe 620 through a seventh connection pipe 345, the eighth passage 342 may be connected to the gas pipe 630 through an eighth connection pipe 347, the seventh passage 341 may be connected to the liquid pipe 610 through a fourth refrigerant pipe 343, and a fourth indoor expansion device 344 may be provided in the fourth refrigerant pipe 343. In this way, the fourth heat exchanger can perform heating or cooling as in the first to third heat exchangers. Meanwhile, a seventh control valve 346 may be provided in the seventh connection pipe 345, and an eighth control valve 348 may be provided in the eighth connection pipe 347. The four indoor heat exchangers are arranged in a diamond shape, and in order to improve the heat exchange efficiency of the indoor heat exchangers, a shell 100 of the indoor unit of the air conditioner is provided with an air inlet, an air outlet and an air duct communicated with the air inlet and the air outlet; a plurality of indoor heat exchangers are arranged in the air duct, and the indoor heat exchangers and the extending direction of the air duct form an included angle. Therefore, when the airflow passes through the air duct, the airflow can pass through the four heat exchangers, so that the heat exchange effect of the four heat exchangers is better. The expansion devices according to the present application, for example, the first indoor expansion device 314, the second indoor expansion device 324, the third indoor expansion device 334, the fourth indoor expansion device 344, the outdoor expansion device 770, and the like may have an expansion structure such as an electronic expansion valve. It is worth to say that fan 200 is also arranged in the air duct, and an air outlet of fan 200 is arranged towards the indoor heat exchanger.

It should be noted that, regarding the connection manner of 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 may be respectively and independently communicated with the liquid pipe 610, or may be communicated with a plurality of liquid pipes 610. For example, after the first refrigerant pipe 313 is communicated with the second refrigerant pipe 323, the first communication pipe 510 is communicated with the liquid pipe 610; the third refrigerant pipe 333 is connected to the fourth refrigerant pipe 343, and then is connected to the liquid pipe 610 through the second connection pipe 520.

Similarly, regarding the connection manner between the high-pressure pipe 620 and the first connection pipe 315, the third connection pipe 325, the fifth connection pipe 335, and the seventh connection pipe 345, the first connection pipe 315, the third connection pipe 325, the fifth connection pipe 335, and the seventh connection pipe 345 may be respectively and independently communicated with the high-pressure pipe 620, or may be communicated with the high-pressure pipe 620 after being communicated with a plurality of pipes. For example, after the first connection pipe 315 is connected to the third connection pipe 325, the third connection pipe 530 is connected to the high-pressure pipe 620; after the fifth connection pipe 335 is connected to the seventh connection pipe 345, it is connected to the high-pressure pipe 620 through the fourth connection pipe 540.

Similarly, regarding the connection manner between air tube 630 and second connecting tube 317, fourth connecting tube 327, sixth connecting tube 337 and eighth connecting tube 347, second connecting tube 317, fourth connecting tube 327, sixth connecting tube 337 and eighth connecting tube 347 may be respectively and independently communicated with air tube 630, or a plurality of air tubes 630 may be communicated with each other. For example, after the second connecting pipe 317 is connected to the fourth connecting pipe 327, the fifth connecting pipe 550 is connected to the air pipe 630; after the sixth connection pipe 337 is connected to the eighth connection pipe 347, it is connected to the air pipe 630 through the sixth connection pipe 560.

The present invention further provides an air conditioner, which includes an outdoor unit and an indoor unit, and the specific structure of the indoor unit of the air conditioner refers to the above embodiments. The outdoor unit of the air conditioner comprises a compressor 710 and an outdoor heat exchanger 750; a discharge pipe 711 connected to a discharge side of the compressor 710, a suction pipe 712 connected to a suction side of the compressor 710, and a liquid pipe 610 sequentially connecting the discharge pipe 711, the outdoor heat exchanger 750, and one or more indoor heat exchangers of the indoor air conditioning unit; an air pipe 630 connecting one or more indoor heat exchangers with the suction pipe 712; and a high and low pressure pipe and a branch pipe 730 branched from the discharge pipe 711, the high and low pressure pipe 620 sequentially connecting a first intersection of the liquid pipe 610, one or more indoor heat exchangers, and the branch pipe 730, wherein the first intersection is located between the indoor heat exchanger and the outdoor heat exchanger 750.

In some embodiments, in order to improve the flexibility of the system, the air conditioner further includes a first switch 740, the first switch 740 being switchable between a first switching state of the first switch 740 and a second switching state of the first switch 740,

in the first switching state, the first switch 740 communicates the liquid tube with the suction tube 712 and communicates the air tube with the discharge tube 711;

in the second switching state, the first switch 740 communicates the liquid tube with the discharge tube 711 and communicates the air tube with the suction tube 712; and/or the presence of a gas in the gas,

the air conditioner further includes a second switch 760, the second switch 760 being switchable between a third switching state of the second switch 760 and a fourth switching state, in the third switching state, the second switch 760 communicating the high and low voltage pipes with the branch pipe 730; in the fourth switching state, the second switch 760 communicates the high-low pressure pipe with the suction pipe 712. Also connected to the second switch 760 is an auxiliary branch pipe 780, the auxiliary branch pipe 780 being communicated with the suction pipe 712 when the high and low pressure pipes are communicated with the branch pipe 730; when the high and low pressure pipes communicate with the suction pipe 712, the auxiliary branch pipe 780 communicates the suction pipe 712 and the branch pipe 730.

On the basis of all the above embodiments of the refrigerant pipeline, a control method of the air conditioner is introduced below, so that the air conditioner can be properly and accurately controlled according to the requirements of users, and the requirements of the users can be timely and accurately met.

The control method of the air conditioner comprises the following steps:

specifically, in this embodiment, there are various ways to obtain the current indoor environment temperature and the target temperature, for example, the current indoor environment temperature may be detected by a temperature sensor on the air conditioner, or may be obtained from other household appliances or terminals; the target temperature may be obtained from an obtained control instruction sent by the user, or may be retrieved from pre-stored data, or may be from another terminal device. After the current indoor ambient temperature and the target temperature are obtained, the difference between the current indoor ambient temperature and the target temperature is calculated to obtain a target temperature difference, namely the difference between the current indoor ambient temperature and the target temperature. In the heating mode, the indoor temperature is usually lower than the target temperature, and the target temperature difference is less than 0; in the cooling mode, the indoor temperature is generally higher than the target temperature, and the target temperature difference is greater than 0.

when the target temperature difference is smaller than or equal to a first preset temperature difference smaller than 0, the current indoor temperature is far lower than the target temperature, and a large amount of heat is needed to quickly meet the heat demand of a user. At the moment, all indoor heat exchangers are heated completely to ensure that the indoor environment temperature can rise rapidly, so that the requirements of users are met rapidly. Wherein the first predetermined temperature difference may be in the range of-2.5 ℃ to-3.5 ℃, taking-3 ℃ as an example.

when the target temperature difference is greater than or equal to a second preset temperature difference which is greater than 0, the current indoor temperature is far higher than the target temperature, and a large amount of cold is needed to quickly meet the cold requirement of a user. At the moment, all indoor heat exchangers are refrigerated completely to ensure that the indoor environment temperature can be rapidly reduced, so that the requirements of users are rapidly met. Wherein the second predetermined temperature difference may be 2.5 ℃ to 3.5 ℃, for example 3 ℃.

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 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to refrigerate, heat or close according to the value of the target temperature difference; the first preset temperature difference is less than 0, and the second preset temperature difference is greater than 0.

When the target temperature difference is between the first preset temperature difference and the second preset temperature difference, it is indicated that the difference between the current indoor temperature and the target temperature is not very large, and at this time, factors such as humidity and the like should be considered while providing cold and heat for the user, so that not only the requirements of the user on the cold and the heat can be met, but also the requirements of the user on the humidity and other factors can be met. The indoor heat exchanger is specifically used for providing cold or heat, and the quantity of heat or cold provided is determined according to the working condition.

Wherein the first preset temperature difference can be-2.5 ℃ to-3.5 ℃, for example, -3 ℃, and the second preset temperature difference can be 2.5 ℃ to 3.5 ℃, for example 3 ℃; thus, when the target temperature difference is-3 ℃ to 3 ℃, air parameter adjustment other than temperature, such as humidity adjustment, needs to be considered.

The case 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: the part of refrigeration and the rest of heating, or the part of refrigeration and the rest of closing, or the part of heating and the rest of closing, or the part of refrigeration and the part of heating closing.

In order to further more accurately control the temperature adjustment and the humidity adjustment to improve the comfort of the user, 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 turn off according to the value of the target temperature difference specifically includes:

confirming that the target temperature difference is less than or equal to a third preset temperature difference; acquiring the current indoor relative humidity, and 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 indoor relative humidity; wherein the third preset temperature difference is less than 0 and greater than the first preset temperature difference; and/or the presence of a gas in the gas,

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 indicates that the current ambient temperature needs to be continuously increased under the heating condition, but it does not need too fast, and the amount of heat needed in a unit time is less than that needed when heating is just started, and at this time, the humidity requirement of the user may be considered. The third predetermined temperature difference may be in the range of-1.5 deg.C to-0.5 deg.C, taking-1 deg.C as an example.

When the humidity is too high, dehumidification is needed while the temperature is raised, and when the humidity is not too high, the requirement of a user can be met only by raising the temperature. The following specifically describes the process.

Case of only temperature rise:

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 produce heat according to the current relative humidity specifically includes:

comparing the current relative humidity with a preset humidity;

confirming that the current relative humidity is less than the preset humidity, 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 rest are turned off.

Specifically, in this embodiment, the current relative humidity is less than the preset humidity, which indicates that the humidity of the current environment is not particularly high, and the user experience is not affected, and at this time, the air conditioner only performs temperature increase, and does not perform dehumidification. Whether one or two are turned on for heating is determined according to specific conditions. If the current temperature is still more than the target temperature, for example, the target temperature difference is-3 ℃ to-2 ℃, then the two indoor heat exchangers are started to heat; and if the current temperature is less than the target temperature, for example, the target temperature difference is-2 ℃ to-1 ℃, starting an indoor heat exchanger for heating. The preset humidity can be 60% -80%, for example 70%.

The case of both temperature rise and dehumidification is required:

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 refrigerate, and controlling the other two to heat; in this case, the indoor heat exchanger that needs cooling dehumidifies and the indoor heat exchanger that needs heating heats up.

Specific heating and cooling heat exchangers are determined in consideration of the specific arrangement of the indoor heat exchangers.

The shell 100 of the indoor unit of the air conditioner is provided with an air inlet, an air outlet and an air duct communicated with the air inlet and the air outlet, 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, and the third indoor heat exchanger 330 is arranged on one side of the first indoor heat exchanger 320, which is back to 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 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to cool, and the other two heating steps include:

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

Specifically, in this embodiment, because the third indoor heat exchanger 330 is located at a side of the first indoor heat exchanger 320 opposite to the air inlet, after the air enters the air duct from the air inlet, the air exchanges heat with the first indoor heat exchanger 320, and is cooled and dehumidified, and then is heated by the third indoor heat exchanger 330; in this process, the first indoor heat exchanger 310 is always heated. 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 warming can be achieved by the first indoor heat exchanger 310.

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.

The indoor unit of the air conditioner further comprises a fourth indoor heat exchanger 340, and the fourth indoor heat exchanger 340 is connected with the first indoor heat exchanger 320 in parallel; the shell 100 of the indoor unit of the air conditioner is provided with an air inlet, an air outlet and an air duct communicated with the air inlet and the air outlet, 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 one side, back to the air inlet, of the first indoor heat exchanger 320, and the fourth indoor heat exchanger 340 is arranged on one side, back to the air inlet, of the first indoor heat exchanger 310;

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.

When the number of the indoor heat exchangers is four, the third indoor heat exchanger 330 is located on one side of the first indoor heat exchanger 320, which is away from the air inlet, and the fourth indoor heat exchanger 340 is located on one side of the first indoor heat exchanger 310, which is away from the air inlet, taking the splicing shape as an example. At this time, the air can be dehumidified regardless of whether the first indoor heat exchanger 310 cools or the first indoor heat exchanger 320 cools, and the dehumidified air is necessarily reheated by the third indoor heat exchanger 330 and/or the fourth indoor heat exchanger 340.

Confirming that the target temperature difference is greater than or equal to a fourth preset temperature difference, acquiring the current indoor relative humidity, and 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 refrigerate according to the current indoor relative humidity; wherein the fourth predetermined temperature difference is greater than zero and less than the second predetermined temperature difference.

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 is described that, under the working condition of refrigeration, the current ambient temperature needs to be continuously reduced, but not too fast, and the amount of cold required in unit time is less than that required when refrigeration is just started, and at this time, the humidity requirement of the user may be considered. The fourth predetermined temperature difference may be 1.5 ℃ to 0.5 ℃, for example 1 ℃.

When humidity is too high, need the dehumidification when with temperature reduction, when humidity is not too high, not only need the cooling, still need to pay attention to user's experience, the temperature can not descend too fast. The following specifically describes the process.

Only the situation of cooling is required:

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 refrigerate according to the current relative humidity specifically includes:

confirming that the current relative humidity is less than the preset humidity, 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 rest are turned off.

Specifically, in this embodiment, the current relative humidity is less than the preset humidity, which indicates that the humidity of the current environment is not particularly high, and the user experience is not affected, and it is necessary to determine whether to start one or two refrigeration systems according to specific situations. If the current temperature is still more than the target temperature, for example, the target temperature difference is 3-2 ℃, then starting two indoor heat exchangers for refrigeration; and if the current temperature is less than the target temperature, for example, the target temperature difference is 2-1 ℃, starting an indoor heat exchanger for refrigeration. The preset humidity can be 60% -80%, for example 70%.

Not only needs cooling, but also needs comfortable condition:

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 refrigerating the other two; in this case, the indoor heat exchanger that needs cooling dehumidifies and the indoor heat exchanger that needs heating warms up, thereby improving the comfort of the user.

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, wherein the other two steps of cooling specifically comprise:

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.

Specifically, in this embodiment, because the third indoor heat exchanger 330 is located at a side of the first indoor heat exchanger 320 opposite to the air inlet, after the air enters the air duct from the air inlet, the air exchanges heat with the first indoor heat exchanger 320, and is cooled and dehumidified, and then is reheated by the third indoor heat exchanger 330; in this process, the first indoor heat exchanger 310 is always cooled. 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 can be achieved by the first indoor heat exchanger 310.

Confirming that the target temperature difference is greater than the third preset temperature difference and less than the fourth preset temperature difference, one of the first indoor heat exchanger 310 and the first indoor heat exchanger 320 refrigerates, the other heats, and the third heat exchanger is closed; wherein the third preset temperature difference is less than 0 and greater than the first preset temperature difference; the fourth preset temperature difference is larger than zero and smaller than the second preset temperature difference; take the target temperature difference of-1 deg.C to 1 deg.C as an example.

Specifically, in the present embodiment, when the target temperature difference is between the third preset temperature difference and the fourth preset temperature difference, it indicates that the current ambient temperature is very close to the target temperature, even within the range in which the target temperature floats. At this time, the indoor heat exchanger only needs to compensate for a very small amount of cold or heat according to the floating. In this case, one indoor heat exchanger is started for cooling and one indoor heat exchanger is started for heating, and as for the relationship between the cooling capacity of cooling and the heating capacity, the appropriate adjustment can be performed according to the actual demand.

In the above embodiment, how to specifically implement the turning-off, cooling and heating of the first to fourth indoor heat exchangers 310 to 340 is described below by the embodiment:

the first through hole is communicated with a liquid pipe of the air conditioner through a first refrigerant pipe 313, and a first indoor throttling device 314 is arranged on the first refrigerant pipe 313; and/or the presence of a gas in the gas,

the second through hole is communicated with a high-low pressure pipe of the air conditioner through a first connecting pipe, and a first control valve 316 is arranged on the first connecting pipe; the second through port is communicated with an air pipe of the air conditioner through a second connecting pipe, and a second control valve 318 is arranged on the second connecting pipe; and/or the presence of a gas in the gas,

the fourth through hole is communicated with a high-low pressure pipe of the air conditioner through a third connecting pipe, and a third control valve 326 is arranged on the third connecting pipe; the fourth through hole is communicated with an air pipe of the air conditioner through a fourth connecting pipe, and a fourth control valve 327 is arranged on the fourth connecting pipe; and/or the presence of a gas in the gas,

the sixth through hole is communicated with a high-low pressure pipe of the air conditioner through a fifth connecting pipe, and a fifth control valve 336 is arranged on the fifth connecting pipe; the sixth through hole is communicated with an air pipe of the air conditioner through a sixth connecting pipe, and a sixth control valve 337 is arranged on the sixth connecting pipe; and/or the presence of a gas in the gas,

the indoor unit of the air conditioner further comprises a fourth indoor heat exchanger 340, and the fourth indoor heat exchanger 340 is provided with a seventh through hole and an eighth through hole for allowing refrigerant to enter or flow out of the fourth indoor heat exchanger 340; the seventh through hole is communicated with the liquid pipe through a fourth refrigerant pipe, and a fourth indoor throttling device is arranged on the fourth refrigerant pipe; the eighth through port is configured to be communicated with a high-low pressure pipe or an air pipe; the eighth through port is communicated with the high-pressure pipe and the low-pressure pipe through a seventh connecting pipe, and a seventh control valve 346 is arranged on the seventh connecting pipe; and/or the eighth through hole is communicated with the air pipe through an eighth connecting pipe, and an eighth control valve 347 is arranged on the eighth connecting pipe;

the manner 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 the presence of a gas in the gas,

the manner 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 the presence of a gas in the gas,

the manner of closing the third indoor heat exchanger 330 includes closing the third indoor throttle device, and/or closing the fifth control valve 336 and the sixth control valve 337; and/or the presence of a gas in the gas,

the manner 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.

See in particular the following table:

table 1 shows operation states of the first to fourth indoor throttling devices 314 to 314 and the first to eighth control valves 316 to 347 when the first to fourth indoor heat exchangers 310 to 340 are turned off, heated and cooled

The invention further provides an air conditioner, which comprises a memory, a processor and a control program of the air conditioner, wherein the control program of the air conditioner is stored in the memory and can be operated on the processor, and the control program of the air conditioner realizes the steps of the control method of the air conditioner when being executed by the processor. The control method of the air conditioner comprises the following steps:

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 perform cooling, heating, or closing according to the value of the target temperature difference specifically includes:

and controlling the first indoor heat exchanger 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to partially cool and partially heat, or partially cool and partially turn off, or partially heat and partially turn off, or partially cool and partially heat, according to the value of the target temperature difference.

confirming that the target temperature difference is greater than the third preset temperature difference and less than the fourth preset temperature difference, one of the first indoor heat exchanger 310 and the first indoor heat exchanger 320 refrigerates, the other heats, and the third heat exchanger is closed; wherein the third preset temperature difference is less than 0 and greater than the first preset temperature difference; the fourth preset temperature difference is larger than zero and smaller than the second preset temperature difference; and/or the presence of a gas in the gas,

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 produce heat according to the current relative humidity specifically includes:

comparing the current relative humidity with a 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 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to refrigerate, and controlling the other two to heat; and/or the presence of a gas in the gas,

Optionally, the casing 100 of the indoor unit of the air conditioner has an air inlet, an air outlet, and an air duct communicating the air inlet and the air outlet, the multiple indoor heat exchangers are disposed in the air duct, the first indoor heat exchanger 310 and the first indoor heat exchanger 320 are disposed near the air inlet, and the third indoor heat exchanger 330 is disposed on a side of the first indoor heat exchanger 320 opposite to the air inlet;

Optionally, the indoor unit of the air conditioner 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 shell 100 of the indoor unit of the air conditioner is provided with an air inlet, an air outlet and an air duct communicated with the air inlet and the air outlet, 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 one side, back to the air inlet, of the first indoor heat exchanger 320, and the fourth indoor heat exchanger 340 is arranged on one side, back to the air inlet, of the first indoor heat exchanger 310;

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 refrigerate according to the current relative humidity specifically includes:

comparing the current relative humidity with a 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 310, the first indoor heat exchanger 320 and the third indoor heat exchanger 330 to heat, and refrigerating the other two; and/or the presence of a gas in the gas,

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A control method of an air conditioner comprises an air conditioner indoor unit, and is characterized in that the air conditioner indoor unit comprises at least three indoor heat exchangers which are respectively a first indoor heat exchanger, a second indoor heat exchanger and a third indoor heat exchanger,

the control method of the air conditioner comprises the following steps:

2. The method as claimed in claim 1, wherein the step of controlling the first, second and third indoor heat exchangers to cool, heat or turn off according to the value of the target temperature difference includes:

and controlling part of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to refrigerate and the rest to heat according to the value of the target temperature difference, or controlling part of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to refrigerate and heat, or controlling part of the first indoor heat exchanger.

3. The method as claimed in claim 1, wherein the step of controlling the first, second and third indoor heat exchangers to cool, heat or turn off according to the value of the target temperature difference includes:

4. The method as claimed in claim 3, wherein the step of controlling one or more of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to generate heat according to the current relative humidity comprises:

comparing the current relative humidity with a preset humidity;

5. The control method of the air conditioner according to claim 4, wherein the casing of the indoor unit of the air conditioner has an air inlet, an air outlet, and an air duct communicating the air inlet and the air outlet, a plurality of indoor heat exchangers are disposed in the air duct, the first indoor heat exchanger and the second indoor heat exchanger are disposed near the air inlet, and the third indoor heat exchanger is disposed on a side of the second indoor heat exchanger opposite to the air inlet;

6. The control method of an air conditioner according to claim 3, wherein the indoor unit of the air conditioner further includes a fourth indoor heat exchanger connected in parallel with the second indoor heat exchanger; the shell of the indoor unit of the air conditioner is provided with an air inlet, an air outlet and an air duct communicated with 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 one side, back to the air inlet, of the second indoor heat exchanger, and the fourth indoor heat exchanger is arranged on one side, back to the air inlet, of the first indoor heat exchanger;

7. The method as claimed in claim 3, wherein the step of controlling one or more of the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger to refrigerate according to the current relative humidity comprises:

comparing the current relative humidity with a preset humidity;

8. The control method of the air conditioner according to claim 7, wherein the casing of the indoor unit of the air conditioner has an air inlet, an air outlet, and an air duct communicating the air inlet and the air outlet, a plurality of indoor heat exchangers are disposed in the air duct, the first indoor heat exchanger and the second indoor heat exchanger are disposed near the air inlet, and the third indoor heat exchanger is disposed on a side of the second indoor heat exchanger opposite to the air inlet;

9. The method as claimed in any one of claims 1 to 8, wherein the first through opening 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 the presence of a gas in the gas,

10. An air conditioner, characterized in that the air conditioner comprises a memory, a processor, and a control program of the air conditioner stored in the memory and executable on the processor, the control program of the air conditioner realizing the steps of the control method of the air conditioner according to any one of claims 1 to 9 when executed by the processor.