CN112797657A

CN112797657A - Air conditioner and control method thereof

Info

Publication number: CN112797657A
Application number: CN201911034321.2A
Authority: CN
Inventors: 邱向伟; 李向阳; 张�浩; 黎顺全; 雷俊杰
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
Anticipated expiration: 2039-10-28
Also published as: CN112797657B

Abstract

The invention discloses an air conditioner and a control method thereof, comprising the following steps: the first refrigerant circulation system includes: the first indoor unit comprises a first compressor and a first outdoor heat exchanger, and the first indoor unit comprises a first indoor heat exchanger and a first indoor throttling device; a first exhaust pipe, a first intake pipe, a first piping, and a second piping; the second refrigerant cycle system includes: the second indoor unit comprises a second compressor and a second outdoor heat exchanger, and the second indoor unit comprises a second indoor heat exchanger and a second indoor throttling device; a second exhaust pipe, a second intake pipe, a third pipe, and a fourth pipe; a first communicating pipe and a second communicating pipe; and a first control valve provided in the second pipe between the third connection point and the first intake pipe. The technical scheme of the invention is beneficial to improving the utilization rate 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

Due to the complexity of weather, the air conditioner needs to have multiple functions at the same time to meet the requirements of people. For example, in order to overcome the weather with very high humidity, it is necessary for an air conditioner to have a dehumidifying function. However, the existing air conditioner with dehumidification function cannot provide enough heat energy to maintain the indoor temperature while dehumidifying. Therefore, the air conditioner with two sets of refrigerant circulating systems is provided, but the two sets of refrigerant circulating systems do not interact with each other, so that the multifunctional performance of the air conditioner is limited.

Disclosure of Invention

The invention mainly aims to provide an air conditioner and a control method thereof, and aims to realize refrigerant interaction between two sets of refrigerant circulating systems.

In order to achieve the above object, the present invention provides an air conditioner, comprising:

a first refrigerant cycle system, the first refrigerant cycle system comprising:

the outdoor unit comprises a first compressor and a first outdoor heat exchanger, and the first indoor unit comprises a first indoor heat exchanger and a first indoor throttling device;

the first exhaust pipe is arranged at the discharge port of the first compressor, the first suction pipe is arranged at the suction port of the compressor, and the first piping is sequentially connected with the first exhaust pipe, the first outdoor heat exchanger, the first indoor throttling device and the first indoor heat exchanger; a second pipe connecting the first indoor heat exchanger and the first intake pipe;

a second refrigerant cycle system, the second refrigerant cycle system comprising:

a second indoor unit and a second outdoor unit, the second outdoor unit including a second compressor and a second outdoor heat exchanger, the second indoor unit including a second indoor heat exchanger and a second indoor throttling device;

a second exhaust pipe arranged at the discharge port of the second compressor, a second suction pipe arranged at the suction port of the compressor, and a third piping connected with the second suction pipe, the second outdoor heat exchanger, the second indoor throttling device and the second indoor heat exchanger in sequence; a fourth pipe connecting the second indoor heat exchanger and the second exhaust pipe;

a first connection pipe, one end of which is connected to the first connection point with the first piping and the other end of which is connected to the second connection point with the third piping;

one end of the second communication pipe is communicated with the second distribution pipe at a third connection point, and the other end of the second communication pipe is connected with the fourth distribution pipe at a fourth connection point;

a first control valve provided in the second pipe between the third connection point and the first intake pipe;

and the heat circulating device is used for transmitting the heat energy or the cold energy of the first indoor heat exchanger and the second indoor heat exchanger to the indoor space.

Optionally, a fourth control valve is provided on the first piping between the first connection point and the first outdoor heat exchanger.

Optionally, the air conditioner further comprises:

a fifth control valve provided on a third pipe between the second connection point and the second outdoor heat exchanger;

and a sixth control valve provided in the fourth pipe between the fourth connection point and the second discharge pipe.

Optionally, the first connection point is located on a first pipe between the first indoor throttling device and the first indoor heat exchanger.

Optionally, the second connection point is located on a third pipe between the second indoor throttling device and the second indoor heat exchanger;

the air conditioner further includes a sixth control valve provided on a fourth pipe between the fourth connection point and the second discharge pipe.

Optionally, a second control valve is arranged on the first connecting pipe; and/or the presence of a gas in the gas,

and a third control valve is arranged on the second connecting pipe.

Optionally, the first refrigerant circulation system further includes a first reversing device, and the first reversing device is disposed between the first exhaust pipe, the first piping, the second piping, and the first suction pipe, so that the first exhaust pipe is communicated with the first piping, and the first suction pipe is communicated with the second piping; alternatively, the first exhaust pipe communicates with the second pipe, and the first intake pipe communicates with the first pipe.

Optionally, the first refrigerant circulation system further includes: a first connection pipe branched from the second pipe, and a second connection pipe branched from the first pipe;

the first refrigerant circulating system further comprises a plurality of first indoor units, and the first indoor units are connected to the first connecting pipe and the second connecting pipe in parallel.

Optionally, the air conditioner further comprises a fourth control valve; the first connecting pipe and the first pipe are connected to a fifth connecting point, and the fourth control valve is located on a pipeline between the fifth connecting point and the first connecting point.

Optionally, the second connection pipe and the second pipe are connected to a sixth connection point, and the first control valve is located on the second pipe line between the third connection point and the sixth connection point.

Optionally, the second refrigerant circulation system further includes a second reversing device disposed between the second exhaust pipe, the third pipe, the fourth pipe, and the second suction pipe, so that the second exhaust pipe is communicated with the third pipe, and the second suction pipe is communicated with the fourth pipe; alternatively, the second exhaust pipe communicates with the fourth pipe, and the second intake pipe communicates with the third pipe.

Optionally, the second refrigerant cycle system further includes: a third connection pipe branched from the fourth pipe, and a fourth connection pipe branched from the third pipe;

the second refrigerant circulating system further includes a plurality of second indoor units connected in parallel to the third connecting pipe and the fourth connecting pipe.

Optionally, the air conditioner further comprises a fifth control valve and a sixth control valve;

the third connecting pipe and the third pipe are connected to a seventh connecting point, and a fifth control valve is positioned on a pipeline between the seventh connecting point and the second connecting point; and/or the presence of a gas in the gas,

the fourth connection pipe and the fourth pipe are connected to an eighth connection point, and the sixth control valve is located on a fourth pipe line between the fourth connection point and the eighth connection point.

The present invention further provides an air conditioner, comprising:

a sixth control valve provided in a fourth pipe between the fourth connection point and the second discharge pipe;

The invention further provides a control method of the air conditioner, which comprises the following steps:

acquiring a refrigeration mode instruction;

closing the fifth control valve and the sixth control valve according to the refrigerating mode instruction;

the air conditioner includes:

acquiring a mode instruction;

controlling the first control valve to open and close according to the mode command;

wherein, the air conditioner includes:

Optionally, the mode command is a heating mode command, and the step of controlling the opening and closing of the first control valve according to the mode command includes:

the first control valve is closed and the fourth control valve is opened or closed.

Optionally, the mode command is a cooling mode command, and the step of controlling the opening and closing of the first control valve according to the mode command includes:

and closing the fifth control valve and the sixth control valve, and opening the first control valve, the second control valve and the third control valve.

Optionally, the mode command is a dehumidification and reheat mode command, and the step of controlling the first control valve to open and close according to the mode command comprises:

the first control valve is opened and the second and third control valves are closed.

In the technical scheme of the invention, through the arrangement of the first communicating pipe, the second communicating pipe and the first control valve, the refrigerant in the second refrigerant circulating system can enter the first indoor heat exchanger from the first distribution pipe through the second communicating pipe and then flow back to the third distribution pipe through the first communicating pipe, so that the first indoor heat exchanger and the second indoor heat exchanger can simultaneously heat after the second compressor works; therefore, the first refrigerant circulating system and the second refrigerant circulating system are exchanged, when the first refrigerant circulating system breaks down, the first indoor heat exchanger can still be utilized by the second refrigerant circulating system, the utilization rate of the indoor heat exchanger of the air conditioner is improved, more functions of the air conditioner are achieved, and the utilization rate of the air conditioner and the capability of dealing with emergency situations are improved.

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 diagram of the air conditioner of the present invention;

FIG. 2 is a schematic structural diagram of an outdoor heat exchanger according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention in a normal cooling mode;

FIG. 4 is a schematic structural diagram of an air conditioner in a forced cooling mode according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention in a normal heating mode;

FIG. 6 is a schematic structural diagram of the air conditioner of the present invention in a forced hot mode in accordance with a next embodiment;

FIG. 7 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention in a heating and dehumidifying mode;

FIG. 8 is an enlarged schematic view of an embodiment at A in FIG. 7;

FIG. 9 is an enlarged view of the structure at B in FIG. 7;

FIG. 10 is an enlarged view of the structure of FIG. 7 at C;

FIG. 11 is an enlarged view of the structure of FIG. 7 at D;

fig. 12 is an enlarged schematic view of another embodiment at a in fig. 7.

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 specific structure of the air conditioner will be mainly described below.

Referring to fig. 1 to 6, first, the entire piping structure and component arrangement of the air conditioner will be described; in an embodiment of the present invention, the air conditioner includes:

a first refrigerant cycle 100, the first refrigerant cycle 100 comprising:

a first indoor unit including a first compressor 110 and a first outdoor heat exchanger 140, and a first outdoor unit including a first indoor heat exchanger 150 and a first indoor throttling device;

a first exhaust pipe 111 provided at the discharge port of the first compressor 110, a suction pipe provided at the suction port of the compressor, and a first pipe 130 connecting the first exhaust pipe 111, the first outdoor heat exchanger 140, the first indoor throttle device, and the first indoor heat exchanger 150 in this order; a second pipe 160 connecting the first indoor heat exchanger 150 and the first intake pipe 170;

a second refrigerant cycle 200, the second refrigerant cycle 200 comprising:

a second indoor unit including a second compressor 210 and a second outdoor heat exchanger 240, and a second outdoor unit including a second indoor heat exchanger 250 and a second indoor throttling device;

a second discharge pipe 211 provided at a discharge port of the second compressor 210, a suction pipe provided at a suction port of the compressor, and a third pipe 230 connecting the second suction pipe 270, the second outdoor heat exchanger 240, the second indoor throttle device, and the second indoor heat exchanger 250 in this order; a fourth pipe 260 connecting the second indoor heat exchanger 250 and the second exhaust pipe 211;

a thermal cycle device for transferring the heat energy or the cold energy of the first indoor heat exchanger 150 and the second indoor heat exchanger 250 to the indoor.

Specifically, in the present embodiment, in the first refrigerant cycle system 100, the first indoor throttling device 133 may be a throttle valve, for example, an electronic expansion valve or an electric valve, the first indoor throttling device 133 may control the flow rate of the refrigerant flowing into or flowing out of the first indoor heat exchanger 150, and the opening degree of the first indoor throttling device 133 may be adjusted according to the cooling capacity or the heating capacity (user requirement) required to be released by the first indoor heat exchanger 150. The refrigerant flows out of the first compressor 110 through the first exhaust pipe 111, enters the first outdoor heat exchanger 140 to release heat, passes through the first indoor throttling device 133, enters the first indoor heat exchanger 150 to absorb heat, and flows back to the compressor through the second piping 160 and the first suction pipe 170 after the refrigerant is evaporated.

In the second refrigerant cycle 200, the second indoor throttling device 233 may be a throttle valve, for example, an electronic expansion valve or an electric valve, the second indoor throttling device 233 may control a flow rate of the refrigerant flowing into or flowing out of the second indoor heat exchanger 250, and an opening degree of the second indoor throttling device 233 is adjusted according to a cooling capacity or a heating capacity (user demand) required to be released by the second indoor heat exchanger 250. The refrigerant flows out of the second compressor 210 through the second discharge pipe 211, flows into the second indoor heat exchanger 250 through the fourth pipe 260, releases heat in the second indoor heat exchanger 250, passes through the second indoor throttling device 233, enters the second outdoor heat exchanger 240 to absorb heat, evaporates, and flows back into the compressor through the third pipe 230 and the second suction pipe 270.

The air conditioner includes two refrigerant circulation systems independent of each other, and the first indoor heat exchanger 150 performs cooling after the first compressor 110 operates, and the second indoor heat exchanger 250 performs heating after the second compressor 210 operates. Under the operation of the heat cycle device, the coldness of the first indoor heat exchanger 150 and the heat of the second indoor heat exchanger 250 are transmitted into the indoor. As the air flow passes through the first indoor heat exchanger 150, water vapor in the air is condensed, thereby reducing moisture in the air and improving the dryness of the air. The temperature of the air flow is increased under the action of heat. Thus, the dryness of the indoor air is improved, and the indoor air receives both heat energy and cold energy in terms of temperature. The air temperature can be adjusted according to the requirement, and if the indoor temperature needs to be increased in the dehumidification process, the working frequency of the second compressor 210 can be increased, so that the power of the second indoor heat exchanger 250 is increased, and the heat released by the second indoor heat exchanger 250 is larger than the cold released by the first heat exchanger; if only the temperature needs to be maintained during the dehumidification process, the amount of cold released by the first indoor heat exchanger 150 and the amount of heat released by the second indoor heat exchanger 250 may be set to be equivalent.

In this embodiment, after the first compressor 110 operates, the first indoor heat exchanger 150 dehumidifies, after the second compressor 210 operates, the second indoor heat exchanger 250 provides heat energy, and then the heat circulation device transfers the cold energy generated by the first indoor heat exchanger 150 and the heat energy generated by the second indoor heat exchanger 250 to the indoor space, so that in the process of energy transfer, or after the energy is transferred to the indoor space, the indoor air can be effectively dried, and the temperature can be raised by the heat energy; because the first indoor heat exchanger 150 and the second indoor heat exchanger 250 are respectively arranged in two refrigerant systems which are independent of each other, the power consumption of the first indoor heat exchanger 150 and the power consumption of the second indoor heat exchanger 250 are not affected by each other, the power of the first compressor 110 and the power of the second compressor 210 can be adjusted according to the requirements of users, dehumidification and reheating are achieved, even heating and dehumidification are achieved, and therefore, not only humid weather such as 'return to south' can be solved for the users, but also the adaptability of the air conditioner can be greatly improved.

It should be noted that the first indoor heat exchanger 150 and the second indoor heat exchanger 250 may have different sizes or the same size. When the two heat exchangers on the indoor side are of comparable size, the compressor specifications used in each system can be comparable. The compressor specification at this time can be 20% to 50% smaller than that of a compressor of a unit of the same load. That is, under the same load, the compressor at this time is only required to be 50% to 80%, which is much smaller than the compressor under the same load.

In some embodiments, in order to allow better mixing of the air passing through the first indoor heat exchanger 150 and the air passing through the second indoor heat exchanger 250, the air conditioner includes an indoor cabinet in which the first and second

indoor heat exchangers

150 and 250 are disposed.

Specifically, in this embodiment, the first indoor heat exchanger 150 and the second indoor heat exchanger 250 are disposed in the same indoor housing, so that the cold energy and the heat energy generated by the first indoor heat exchanger 150 and the second indoor heat exchanger 250, respectively, can rapidly affect the heat-exchanged air. Meanwhile, the compactness of the structure is effectively improved, and the space is fully utilized. There are various ways for the heat energy or the cold energy to enter the room, and the heat energy or the cold energy may directly pass through the first indoor heat exchanger 150 and the second indoor heat exchanger 250 in sequence, or pass through the second indoor heat exchanger 250 and the first indoor heat exchanger 150 in sequence; or may be mixed after passing through the first indoor heat exchanger 150 and the second indoor heat exchanger 250, respectively. Of course, the liquid passing through the indoor heat exchanger can also be liquid, and the liquid transfers cold energy or heat energy to the air after exchanging heat with the indoor heat exchanger.

Take the example that the air directly exchanges heat with the indoor heat exchanger. The indoor machine shell is provided with an air inlet, an air outlet and an air channel communicated with the air inlet and the air outlet; the first indoor heat exchanger 150 and the second indoor heat exchanger 250 are arranged in the air duct; the heat circulating device comprises a fan, and the fan is arranged in the air duct. There are various arrangements of the first indoor heat exchanger 150 and the second indoor heat exchanger 250 in the air duct, and the first indoor heat exchanger and the second indoor heat exchanger may be arranged in the width direction or the height direction of the air duct (up-down arrangement), or may be arranged in the extending direction of the air duct. For example, the first indoor heat exchanger 150 is disposed at a position close to the air inlet, and the second indoor heat exchanger 250 is disposed at a position close to the air outlet, so that the air flow is dehumidified by the first indoor heat exchanger 150, and then heated to return to the temperature by the second indoor heat exchange.

Of course, in some embodiments, the first indoor heat exchanger 150 and the second indoor heat exchanger 250 may be respectively located in different housings, and the two heat-exchanged fluids (air or liquid) are mixed, or the fluids sequentially pass through the first indoor heat exchanger 150 and the second indoor heat exchanger 250.

In some embodiments, in order to simplify the manufacturing process of the first and second

outdoor heat exchangers

140 and 240, the manufacturing efficiency is improved, and the heat exchange efficiency of the first and second

outdoor heat exchangers

140 and 240 is improved.

The air conditioner includes an outdoor cabinet, and the first and second

outdoor heat exchangers

140 and 240 are disposed in the outdoor cabinet. The first and second

outdoor heat exchangers

140 and 240 are disposed adjacent to each other such that the first and second heat exchangers can exchange heat with each other. When only one of the outdoor heat exchangers works, the working heat exchanger can exchange heat through the other heat exchanger, so that the heat exchange efficiency of the outdoor heat exchanger is improved. When the operating states of the first outdoor heat exchanger 140 and the second outdoor heat exchanger 240 are opposite, for example, the first outdoor heat exchanger 140 releases heat, and the second outdoor heat exchanger 240 absorbs heat, at this time, the first outdoor heat exchanger 140 and the second outdoor heat exchanger 240 can further improve the respective heat exchange efficiency.

In some embodiments, to further improve the heat dissipation efficiency of the first and second

outdoor heat exchangers

140 and 240. The first outdoor heat exchanger 140 and the second outdoor heat exchanger 240 are integrally disposed, and refrigerant pipes of the first outdoor heat exchanger 140 and the second outdoor heat exchanger 240 are disposed in the same fin group. That is, when the outdoor heat exchanger is manufactured, the first outdoor heat exchanger 140 and the second outdoor heat exchanger 240 are manufactured as the same heat exchanger, and then a part of refrigerant pipes therein is divided into the first outdoor heat exchanger 140, and the other part of refrigerant pipes is divided into the second outdoor heat exchanger 240. The refrigerant pipes of the first outdoor heat exchanger 140 and the second outdoor heat exchanger 240 share the fin group, so that the refrigerant pipes of the first outdoor heat exchanger 140 and the refrigerant pipes of the second outdoor heat exchanger 240 can exchange heat through all fins, and thus, the heat exchange area of the first refrigerant pipe of the first outdoor heat exchanger 140 and the heat exchange area of the second refrigerant pipe of the second outdoor heat exchanger 240 are greatly improved, and meanwhile, quick heat exchange can be carried out between the first refrigerant pipe and the second refrigerant pipe through the fins, so that the heat exchange efficiency of the first outdoor heat exchanger 140 and the heat exchange efficiency of the second outdoor heat exchanger 240 are greatly improved.

In some embodiments, to further improve the heat exchange efficiency of the first and second

outdoor heat exchangers

140 and 240, the first outdoor heat exchanger 140 includes a plurality of first refrigerant pipe sections 141 arranged along the height direction of the first heat exchanger; the second outdoor heat exchanger 240 includes a plurality of second refrigerant pipe sections 241 arranged in the height direction of the first heat exchanger; the first refrigerant pipe sections 141 and the second refrigerant pipe sections 241 are alternately adjacent to each other in a height direction of the outdoor heat exchanger. In this embodiment, the plurality of first refrigerant pipe sections 141 are spliced to form the first refrigerant pipe, and the first refrigerant pipe sections 141 are arranged along one of the height direction, the length direction and the width direction of the first outdoor heat exchanger 140, for example, in the height direction. The first refrigerant pipe section 141 is disposed horizontally or vertically, for example, horizontally. Similarly, the plurality of second refrigerant pipe segments 241 are spliced to form a second refrigerant pipe, and the second refrigerant pipe segments 241 are arranged along one of the height direction, the length direction and the width direction of the second outdoor heat exchanger 240, for example, in the height direction. The second refrigerant pipe section 241 is disposed horizontally or vertically, for example, horizontally. The projections of the first refrigerant pipe segment 141 and the second refrigerant pipe segment 241 on the horizontal plane may be overlapped, and may also have a certain preset gap.

In some embodiments, in order to improve the adaptability of the air conditioner, not only dehumidification reheating, normal cooling and normal heating can be realized, but also forced cooling and forced heating can be realized, and sudden accidents can be responded.

In the present invention, the first refrigerant cycle system 100 further includes a first direction changing device 120, the first direction changing device 120 is disposed between the first exhaust pipe 111, the first pipe 130, the second pipe 160, and the first suction pipe 170, so that the first exhaust pipe 111 communicates with the first pipe 130, and the first suction pipe 170 communicates with the second pipe 160; alternatively, the first exhaust pipe 111 communicates with the second pipe 160, and the first intake pipe 170 communicates with the first pipe 130.

The first direction changing device 120 may be a four-way valve or a mechanism capable of adjusting the flow direction of the refrigerant. When the first exhaust pipe 111 directly communicates with the first indoor heat exchanger 150 through the second pipe 160, the first indoor heat exchanger 150 heats; when the first exhaust pipe 111 is first communicated with the first outdoor heat exchanger 140 through the first pipe 130 and then communicated with the first indoor heat exchanger 150, the first indoor heat exchanger 150 cools. Through the arrangement of the first reversing device 120, the cooling and heating states of the first indoor heat exchanger 150 can be freely switched, so that the first indoor heat exchanger can be fully matched with the second indoor heat exchanger 250, and the functions of forced heating and the like are realized.

In the present invention, the second refrigerant circulation system 200 further includes a second direction changing device 220, the second direction changing device 220 is disposed between the second gas outlet pipe 211, the third piping 230, the fourth piping 260, and the second gas inlet pipe 270, so that the second gas outlet pipe 211 is communicated with the third piping 230, and the second gas inlet pipe 270 is communicated with the fourth piping 260; alternatively, the second exhaust pipe 211 communicates with the fourth pipe 260, and the second intake pipe 270 communicates with the third pipe 230.

The second direction changing device 220 may be a four-way valve or a mechanism capable of adjusting the flow direction of the refrigerant. When the second exhaust pipe 211 directly communicates with the second indoor heat exchanger 250 through the fourth piping 260, the second indoor heat exchanger 250 generates heat; when the second discharge pipe 211 is first communicated with the second outdoor heat exchanger 240 through the third pipe 230 and then communicated with the second indoor heat exchanger 250, the second indoor heat exchanger 250 cools. Through the arrangement of the second reversing device 220, the cooling and heating states of the second indoor heat exchanger 250 can be freely switched, so that the second indoor heat exchanger can be fully matched with the first indoor heat exchanger 150, and the functions of forced cooling and the like are realized.

When the first direction changing device 120 and the second direction changing device 220 are simultaneously disposed, the first refrigerant circulating system 100 and the second refrigerant circulating system 200 are two independent multi-functional air conditioning systems, and can perform cooling and heating respectively. When one system fails and can not work, the other system can be used as a standby system to start working immediately to replace the failed system for operation. Therefore, the dual-system air conditioner has a backup function, and the reliability of service provided by the air conditioner can be greatly improved. Meanwhile, more temperature requirement choices such as forced cooling, forced heating and the like are provided for users.

In some embodiments, the first refrigerant cycle 100 and the second refrigerant cycle 200 may be adjusted to improve the stability and performance of the first refrigerant cycle.

The first refrigerant cycle system 100 further includes a first outdoor throttling device 131, and the first outdoor throttling device 131 is disposed on the first pipe 130; and/or, the second refrigerant cycle system 200 further includes a second outdoor throttling device 231, and the second outdoor throttling device 231 is disposed on the third pipe 230.

In order to better regulate the pressure and temperature of the refrigerant in the entire first refrigerant cycle system 100, the first refrigerant cycle system 100 further includes a first outdoor throttling device 131, and the first outdoor throttling device 131 is disposed on the first pipe 130 between the first outdoor heat exchanger 140 and the first indoor heat exchanger 150. The first outdoor throttling device 131 may include only the first outdoor electronic expansion valve, and in some embodiments, may further include a first shut-off valve. The first outdoor electronic expansion valve and the first stop valve are provided in this order in the first pipe 130.

Similarly, in order to better regulate the pressure and temperature of the refrigerant in the entire second refrigerant circulation system 200, the second refrigerant circulation system 200 further includes a second outdoor throttling device 231, and the second outdoor throttling device 231 is located on the third pipe 230 between the second outdoor heat exchanger 240 and the second indoor heat exchanger 250. The second outdoor throttling device 231 may include only a second outdoor electronic expansion valve, and in some embodiments, may further include a second shutoff valve 161. The second outdoor electronic expansion valve and the second shutoff valve 161 are provided in this order in the third pipe 230.

In some embodiments, in order to better adjust the working condition of the refrigerant in the refrigerant circulation system, a third stop valve 232 and a fourth stop valve 261 are further disposed on the second pipe 160 and the fourth pipe 260, respectively.

In some embodiments, in order to ensure stable operation of the first compressor 110 and the second compression, the first refrigerant circulation system 100 further includes a first gas-liquid separator 171, and the first gas-liquid separator 171 is disposed on the first suction pipe 170; and/or, the second refrigerant cycle system 200 further includes a second gas-liquid separator 271, and the second gas-liquid separator 271 is disposed on the second suction pipe 270. The first suction pipe 170 is provided with a first gas-liquid separator 171, and the second suction pipe 270 is provided with a second gas-liquid separator 271. After the refrigerant enters the gas-liquid separator, the liquid refrigerant is left in the gas-liquid separator, and the gaseous refrigerant flows back to the compressor for compression. Therefore, the liquid refrigerant is prevented from entering the compressor, so that liquid impact on the compressor in the compression process is avoided, and the service life and the working stability of the compressor are favorably improved.

In some embodiments, in order to realize the interaction between the dual refrigerant systems, the components of the air conditioner are maximally utilized, so that the air conditioner has more functions.

The air conditioner includes:

a first refrigerant cycle 100, the first refrigerant cycle 100 comprising:

a first exhaust pipe 111 provided at the discharge port of the first compressor 110, a first intake pipe 170 provided at the suction port of the compressor, and a first pipe 130 connecting the first exhaust pipe 111, the first outdoor heat exchanger 140, the first indoor expansion device, and the first indoor heat exchanger 150 in this order; a second pipe 160 connecting the first indoor heat exchanger 150 and the first intake pipe 170;

a second refrigerant cycle 200, the second refrigerant cycle 200 comprising:

a second indoor unit including a second compressor 210 and a second outdoor heat exchanger 240, and a second outdoor unit including a second indoor heat exchanger 250 and a second indoor throttling device 233;

a second discharge pipe 211 provided at a discharge port of the second compressor 210, a second suction pipe 270 provided at a suction port of the compressor, and a third pipe 230 connecting the second suction pipe 270, the second outdoor heat exchanger 240, the second indoor throttle device 233, and the second indoor heat exchanger 250 in this order; a fourth pipe 260 connecting the second indoor heat exchanger 250 and the second exhaust pipe 211;

a first connection pipe 510, one end of the first connection pipe 510 being connected to the first connection point 610 with the first pipe 130, and the other end thereof being connected to the second connection point 620 with the third pipe 230;

a second communication pipe 520 having one end of the second communication pipe 520 and the second pipe 160 communicated with a third connection point 630, and the other end connected to a fourth connection point 640 and the fourth pipe 260;

a first control valve 310, the first control valve 310 being provided on the second pipe 160 between the third connection point 630 and the first suction pipe 170;

Referring to fig. 11 of the specification, in particular, in the present embodiment, the position of the first connection point 610 of the first pipe 510 and the first pipe 130 may be many, for example, the first connection point is located near the first indoor heat exchanger 150 and is located in the cabinet. May be connected between the first indoor throttling device and the first indoor heat exchanger 150, or may be connected to an end of the first indoor throttling device away from the first indoor heat exchanger 150. Similarly, the second connection point 620 between the first connection pipe 510 and the third pipe 230 may be located in many positions, for example, near the second indoor heat exchanger 250 and inside the cabinet. May be connected between the second indoor throttling device 233 and the second indoor heat exchanger 250, or may be connected to an end of the second indoor throttling device 233 far from the second indoor heat exchanger 250.

The third connection point 630 between the second connection pipe 520 and the second piping 160 may be located at a plurality of positions, for example, at a position close to the first indoor heat exchanger 150 and within the cabinet. Similarly, the fourth connection point 640 between the second connection pipe 520 and the fourth piping 260 may be located at a plurality of positions, for example, at a position close to the second indoor heat exchanger 250 and within the cabinet.

The first control valve 310 can be disposed at a plurality of positions, for example, inside the first indoor unit, i.e., inside the casing of the indoor unit, and of course, under specific operating conditions, it can also be disposed outside the casing. When the second compressor 210 operates, the high-temperature and high-pressure refrigerant enters the fourth pipe 260 through the second discharge pipe. After being branched by the fourth connection point 640, a part of the branched flow enters the first indoor heat exchanger 150 through the second connection pipe 520, the third connection point 630, and the second pipe 160, and after passing through the first indoor heat exchanger 150, returns to the third pipe 230 through the first connection point 610, the first connection pipe 510, and the second connection point 620, and returns to the second compressor 210 along the third pipe 230; the other part enters the second indoor heat exchanger 250 along the third pipe 230 and returns to the second compressor 210 along the third pipe 230. At this time, the first control valve 310 is closed, so that the refrigerant cannot flow back into the first compressor 110 along the second pipe 160.

In the technical scheme of the present invention, through the arrangement of the first communication pipe 510, the second communication pipe 520, and the first control valve 310, the refrigerant in the second refrigerant circulation system 200 can enter the first indoor heat exchanger 150 from the first piping 130 through the second communication pipe 520, and then flow back to the third piping 230 through the first communication pipe 510, so that after the second compressor 210 operates, the first indoor heat exchanger 150 and the second indoor heat exchanger 250 simultaneously perform heating; therefore, the first refrigerant circulation system 100 and the second refrigerant circulation system 200 are exchanged, when the first refrigerant circulation system 100 fails, the first indoor heat exchanger 150 can still be utilized by the second refrigerant circulation system 200, so that the utilization rate of the indoor heat exchanger of the air conditioner is improved, more functions of the air conditioner are realized, and the improvement of the utilization rate of the air conditioner and the capability of coping with emergency situations are facilitated.

Referring to fig. 7 to 12, in some embodiments, in order to improve the refrigerant pipeline and fully utilize the air conditioner, a second control valve 320 is disposed on the first communication pipe 510; and/or, the second connection pipe 520 is provided with a third control valve 330.

Next, the second control valve 320 is provided in the first communication pipe 510, and the third control valve 330 is provided in the second communication pipe 520.

When the second control valve 320 and the third control valve 330 are simultaneously closed, the first connection pipe 510 and the second connection pipe 520 are disconnected, and at this time, the first refrigerant circulation system 100 and the second refrigerant circulation system 200 are independent of each other, and at this time, the working condition of the first indoor heat exchanger 150 and the working condition of the second indoor heat exchanger 250 may be set as needed. For example, in the case where no four-way valve is provided, the first indoor heat exchanger 150 cools and dehumidifies air, and the second indoor heat exchanger 250 heats reheated air, so that dehumidification and reheating can be achieved, and water vapor in the air can be removed without affecting user experience.

There are many ways to realize the dual system by arranging the control valve at different positions, and in the following, in the case of not arranging the four-way valve, the first outdoor heat exchanger 140 heats and the second outdoor heat exchanger 240 cools, to take a few examples to explain:

referring to fig. 10, in the case where there is no four-way valve, the fourth control valve 340 is provided in the first pipe 130 between the first connection point 610 and the first outdoor heat exchanger 140. Specifically, in the present embodiment, the first control valve 310 and the fourth control valve 340 are closed, and the second control valve 320 and the third control valve 330 are opened (in the embodiment having the second control valve 320 and the third control valve 330). When the second compressor 210 operates, the high-temperature and high-pressure refrigerant enters the fourth pipe 260 through the second discharge pipe. After being branched by the fourth connection point 640, a part of the branched flow enters the first indoor heat exchanger 150 through the second connection pipe 520, the third connection point 630, and the second pipe 160, and after passing through the first indoor heat exchanger 150, returns to the third pipe 230 through the first connection point 610, the first connection pipe 510, and the second connection point 620, and returns to the second compressor 210 along the third pipe 230; the other part enters the second indoor heat exchanger 250 along the third pipe 230 and returns to the second compressor 210 along the third pipe 230. At this time, the first control valve 310 is closed so that the refrigerant cannot flow back into the first compressor 110 along the second pipe 160, and the fourth control valve 340 is closed so that the refrigerant of the first compressor 110 cannot enter the first indoor heat exchanger 150 and the second indoor heat exchanger for heat exchange. Thus, the second refrigerant circulation system 200 is realized to simultaneously heat the first indoor heat exchanger and the second indoor heat exchanger 250.

Referring to fig. 9, the air conditioner further includes: a fifth control valve 350, the fifth control valve 350 being provided on the third pipe 230 between the second connection point 620 and the second outdoor heat exchanger 240; and a sixth control valve 360, the sixth control valve 360 being provided in the fourth pipe 260 between the fourth connection point 640 and the second discharge pipe.

Specifically, in the present embodiment, the fifth and

sixth control valves

350 and 360 are closed, and the first, second, and

third control valves

310, 320, and 330 are opened (in the embodiment having the second and third control valves 320 and 330). When the first compressor 110 is operated, a high-temperature and high-pressure refrigerant enters the first pipe 130 from the first discharge pipe. After passing through the first outdoor heat exchanger 140, the refrigerant is branched by the first connection point 610, and a part of the refrigerant enters the second indoor heat exchanger 250 after passing through the first connection pipe 510, the second connection point 620, the third piping 230, and the second indoor throttling device 233, and after passing through the second indoor heat exchanger 250, the refrigerant returns to the second piping 160 after passing through the fourth connection point 640, the second connection pipe 520, and the third connection point 630, and returns to the first compressor 110 along the second piping 160; the other part enters the first indoor heat exchanger 150 along the first pipe 130 and returns to the first compressor 110 along the second pipe 160. At this time, the fifth control valve 350 is closed so that the refrigerant cannot flow back into the second compressor 210 along the third pipe 230, and the sixth control valve 360 is closed so that the refrigerant of the second compressor 210 cannot enter the first indoor heat exchanger 150 and exchange heat with the second indoor. In this way, the first refrigerant cycle system 100 simultaneously performs the first indoor heat exchange and the second indoor heat exchanger 250 to perform cooling.

Referring to fig. 12, the first connection point 610 is located on the first pipe 130 between the first indoor throttle device and the first indoor heat exchanger 150.

Specifically, in the present embodiment, referring to the above embodiment in which the fourth control valve 340 is provided, by providing the first connection point 610 between the first indoor throttling device and the first indoor heat exchanger 150, when the first indoor throttling device adjusts the opening degree to zero, it is equivalent to closing the fourth control valve 340. In this way, in the present embodiment, the position of the first connection point 610 may be set in the first pipe 130 between the first indoor throttling device and the first indoor heat exchanger 150 without providing the fourth control valve 340. In this way, it is also possible to achieve simultaneous heating of the first indoor heat exchanger 150 and the second indoor heat exchanger 250.

Referring to fig. 12, the second connection point 620 is located on the third pipe 230 between the second indoor throttle device 233 and the second indoor heat exchanger 250; the air conditioner further includes a sixth control valve 360, and the sixth control valve 360 is provided on the fourth piping 260 between the fourth connection point 640 and the second discharge pipe.

Specifically, in the present embodiment, referring to the embodiment in which the fifth control valve 350 and the sixth control valve 360 are provided as described above, the second connection point 620 is provided between the second indoor throttling device 233 and the second indoor heat exchanger 250, so that when the opening degree of the second indoor throttling device 233 is adjusted to zero, it is equivalent to closing the fifth control valve 350. In this manner, in the present embodiment, the position of the second connection point 620 may be provided in the fourth pipe 260 between the second indoor throttle device 233 and the second indoor heat exchanger 250, instead of the fifth control valve 350. In this manner, it is also possible to realize the simultaneous cooling of the first indoor heat exchanger 150 and the second indoor heat exchanger 250.

Therefore, under the condition that one outdoor heat exchanger refrigerates and the other outdoor heat exchanger heats, the two indoor heat exchangers can realize multiple working conditions, such as simultaneous refrigeration and simultaneous heating, one refrigeration and one heating and the like. As described in detail below, the case when the indoor unit has a plurality of indoor units.

In some embodiments, after the first, second, third and

fourth connection pipes

134, 162, 234 and 262 are provided, the positions of the first, fourth, fifth and

sixth control valves

310, 340, 350 and 360 are explained below by way of providing connection points for clarity.

The air conditioner further includes a fourth control valve 340; the first connection pipe 134 and the first pipe 130 are connected to a fifth connection point 650, and the fourth control valve 340 is located on a pipeline between the fifth connection point 650 and the first connection point 610. In this embodiment, when a plurality of first indoor units, that is, a plurality of first indoor heat exchangers 150 are provided, the plurality of first indoor heat exchangers are disposed in parallel on the first connection pipe 134 and the second connection pipe 162, so that all the first indoor heat exchangers 150 can obtain the refrigerant from the first compressor 110 according to the requirement. In addition to the first communication pipe 510, the second communication pipe 520, the first control valve 310, and the fourth control valve 340, the first indoor heat exchanger 150 may receive the refrigerant from the second compressor 210. Similarly, the second connection pipe 162 and the second pipe 160 are connected to a sixth connection point 660, and the first control valve 310 is located on the second pipe 160 between the third connection point 630 and the sixth connection point 660.

Similarly, the air conditioner further comprises a fifth control valve 350 and a sixth control valve 360; the third connection pipe 234 and the third pipe 230 are connected to a seventh connection point 670, and the fifth control valve 350 is located on a pipeline between the seventh connection point 670 and the second connection point 620; and/or the fourth connection pipe 262 and the fourth pipe 260 are connected to an eighth connection point 680, and the sixth control valve 360 is located on the fourth pipe 260 line between the fourth connection point 640 and the eighth connection point 680.

In this embodiment, when a plurality of second indoor units, that is, a plurality of second indoor heat exchangers 250 are provided, the plurality of second indoor heat exchangers are connected in parallel to the third connecting pipe 234 and the fourth connecting pipe 262, so that all the second indoor heat exchangers 250 can obtain the refrigerant from the second compressor 210 as required. The second indoor heat exchanger 250 may receive the refrigerant from the first compressor 110, in addition to the first communication pipe 510, the second communication pipe 520, the fifth control valve 350, and the sixth control valve 360.

When the combination of the first indoor unit and the second indoor unit exists at the same time, referring to fig. 7, different requirements in different rooms can be satisfied without using a four-way valve, such as requirements of different users for heating, cooling, dehumidification, reheating, and the like.

In some other embodiments, the first indoor heat exchanger 150 and the second indoor heat exchanger 250 may be cooled simultaneously without the first control valve 310.

Specifically, an air conditioner includes: a first refrigerant cycle 100, the first refrigerant cycle 100 comprising: a first indoor unit including a first compressor 110 and a first outdoor heat exchanger 140, and a first outdoor unit including a first indoor heat exchanger 150 and a first indoor throttling device; a first exhaust pipe 111 provided at the discharge port of the first compressor 110, a first intake pipe 170 provided at the suction port of the compressor, and a first pipe 130 connecting the first exhaust pipe 111, the first outdoor heat exchanger 140, the first indoor expansion device, and the first indoor heat exchanger 150 in this order; a second pipe 160 connecting the first indoor heat exchanger 150 and the first intake pipe 170; a second refrigerant cycle 200, the second refrigerant cycle 200 comprising: a second indoor unit including a second compressor 210 and a second outdoor heat exchanger 240, and a second outdoor unit including a second indoor heat exchanger 250 and a second indoor throttling device 233; a second discharge pipe 211 provided at a discharge port of the second compressor 210, a second suction pipe 270 provided at a suction port of the compressor, and a third pipe 230 connecting the second suction pipe 270, the second outdoor heat exchanger 240, the second indoor throttle device 233, and the second indoor heat exchanger 250 in this order; a fourth pipe 260 connecting the second indoor heat exchanger 250 and the second exhaust pipe 211; a first connection pipe 510, one end of the first connection pipe 510 being connected to the first connection point 610 with the first pipe 130, and the other end thereof being connected to the second connection point 620 with the third pipe 230; a second communication pipe 520 having one end of the second communication pipe 520 and the second pipe 160 communicated with a third connection point 630, and the other end connected to a fourth connection point 640 and the fourth pipe 260; a fifth control valve 350, the fifth control valve 350 being provided on the third pipe 230 between the second connection point 620 and the second outdoor heat exchanger 240; a sixth control valve 360, the sixth control valve 360 being provided in the fourth pipe 260 between the fourth connection point 640 and the second discharge pipe; a thermal cycle device for transferring the heat energy or the cold energy of the first indoor heat exchanger 150 and the second indoor heat exchanger 250 to the indoor.

When the first compressor 110 operates, the fifth control valve 350 and the sixth control valve 360 are closed, so that the second indoor heat exchanger 250 is disconnected from the second refrigerant circulation system 200, and the second indoor heat exchanger is connected to the first refrigerant circulation system 100 in parallel with the first indoor heat exchanger 150.

It should be noted that, according to actual needs, those skilled in the art may combine the technical solution of this embodiment with the above embodiments, and details are not described herein because of repeated contents.

In some embodiments, the first refrigerant cycle system 100 further includes a plurality of first indoor units, and each of the first indoor units may include different heat exchangers, such as a common cooling/heating indoor unit, and an indoor unit with a switching device capable of freely switching cooling or heating states. Thus, the first refrigerant cycle 100 can simultaneously perform mixed operations of cooling, heating, and the like on different indoor units.

Specifically, the first refrigerant cycle system 100 further includes: a first connection pipe branched from the second pipe 160, and a second connection pipe 162 branched from the first pipe 130; the first refrigerant cycle system 100 further includes a plurality of first indoor units connected in parallel to the first connection pipe and the second connection pipe 162. Thus, the plurality of first indoor units in the first refrigerant cycle system 100 are connected in parallel, so that the first refrigerant cycle system 100 can provide heat energy or cold energy to a plurality of rooms simultaneously.

Similarly, in some embodiments, the second refrigerant circulation system 200 further includes a plurality of second indoor units, and the heat exchangers included in the second indoor units may be different in form, such as a common cooling/heating indoor unit, or an indoor unit with a switching device capable of freely switching cooling or heating states. Thus, the second refrigerant circulation system 200 can simultaneously perform the mixed operation of cooling, heating, and the like on different indoor units.

Specifically, the second refrigerant cycle system 200 further includes: a third connection pipe 234 branched from the fourth pipe 260, and a fourth connection pipe 262 branched from the third pipe 230; the second refrigerant cycle system 200 further includes a plurality of second indoor units connected in parallel to the third connection pipe 234 and the fourth connection pipe 262.

It should be noted that all the first indoor units include the first indoor heat exchangers 150 and first indoor throttling devices, the first indoor throttling devices control the operating states of the first indoor heat exchangers 150, and when one of the first indoor throttling devices is completely closed, the corresponding first indoor heat exchanger 150 stops operating. Similarly, each second indoor throttling device controls the working state of the second indoor heat exchanger 250, and when a certain second indoor throttling device is completely closed, the corresponding second indoor heat exchanger 250 stops working. Therefore, each first indoor unit and each second indoor unit can be controlled independently, different working modes of different rooms can be realized, and personalized services are provided for users.

The invention further provides a control method of the air conditioner, which is based on the refrigerant circulating system and different types of refrigerant circulating systems, wherein the control mode is different, and the control method mainly controls the opening and closing of the first control valve 310 to the sixth control valve 360. The following examples are given.

When the air conditioning system is provided with only or first with the fifth and sixth control valves 350, 360:

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

acquiring a refrigeration mode instruction;

the fifth and

sixth control valves

350 and 360 are closed according to the cooling mode command.

When the air conditioning system is first provided with the first control valve 310,

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

acquiring a mode instruction;

the opening and closing of the first control valve 310 is controlled according to the mode command.

Heating mode:

a fourth control valve 340 is provided on the first piping between the first connection point and the first outdoor heat exchanger; the mode command is a heating mode command, and the step of controlling the opening and closing of the first control valve 310 according to the mode command includes:

the first control valve 310 is closed and the fourth control valve 340 is opened or closed.

If only the first control valve 310 is provided, the simultaneous heating of the first indoor heat exchanger and the second indoor heat exchanger may be achieved by closing the first control valve 310. If the fourth control valve 340 is provided, the fourth control valve 340 is opened or closed, and the first indoor heat exchanger and the second indoor heat exchanger can also be heated simultaneously.

A refrigeration mode:

the air conditioner further includes: a fifth control valve 350, the fifth control valve 350 being provided on the third pipe between the second connection point and the second outdoor heat exchanger; a sixth control valve 360, the sixth control valve 360 being provided in a fourth pipe between a fourth connection point and the second discharge pipe;

the mode command is a cooling mode command, and the step of controlling the first control valve 310 to open and close according to the mode command includes:

the fifth and

sixth control valves

350 and 360 are closed, and the first, second and

third control valves

310, 320 and 330 are opened.

Dehumidification reheating mode:

a second control valve 320 is arranged on the first communication pipe; and/or a third control valve 330 is arranged on the second communicating pipe;

the mode command is a dehumidification and reheat mode command, and the step of controlling the first control valve 310 to open and close according to the mode command comprises the steps of:

the first control valve 310 is opened and the second control valve 320 and the third control valve 330 are closed.

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. An air conditioner, comprising:

2. The air conditioner according to claim 1, wherein a fourth control valve is provided on a first pipe between the first connection point and the first outdoor heat exchanger.

3. The air conditioner according to claim 1, further comprising:

4. The air conditioner according to claim 1, wherein the first connection point is located on a first pipe between the first indoor throttle device and the first indoor heat exchanger.

5. The air conditioner according to claim 1, wherein the second connection point is located on a third pipe between the second indoor throttle device and the second indoor heat exchanger;

6. The air conditioner as claimed in any one of claims 1 to 5, wherein a second control valve is provided on the first communication pipe; and/or the presence of a gas in the gas,

and a third control valve is arranged on the second communicating pipe.

7. The air conditioner as claimed in claim 1, wherein the first refrigerant circulation system further includes a first direction changing device provided between the first exhaust pipe, the first pipe, the second pipe, and the first suction pipe to communicate the first exhaust pipe with the first pipe and to communicate the first suction pipe with the second pipe; alternatively, the first exhaust pipe communicates with the second pipe, and the first intake pipe communicates with the first pipe.

8. The air conditioner according to claim 1,

the first refrigerant circulating system further includes: a first connection pipe branched from the second pipe, and a second connection pipe branched from the first pipe;

9. The air conditioner of claim 8, further comprising a fourth control valve; the first connecting pipe and the first pipe are connected to a fifth connecting point, and the fourth control valve is located on a pipeline between the fifth connecting point and the first connecting point.

10. The air conditioner according to claim 8, wherein the second connection pipe and the second pipe are connected to a sixth connection point, and the first control valve is located on the second pipe line between the third connection point and the sixth connection point.

11. The air conditioner as claimed in claim 1, wherein the second refrigerant circulation system further includes a second direction changing device provided between the second discharge pipe, the third pipe, the fourth pipe and the second suction pipe to communicate the second discharge pipe with the third pipe and the second suction pipe with the fourth pipe; alternatively, the second exhaust pipe communicates with the fourth pipe, and the second intake pipe communicates with the third pipe.

12. The air conditioner according to claim 1,

the second refrigerant circulation system further includes: a third connection pipe branched from the fourth pipe, and a fourth connection pipe branched from the third pipe;

13. The air conditioner of claim 12, further comprising a fifth control valve and a sixth control valve;

14. The air conditioner according to claim 1, wherein a fourth control valve is provided on a first pipe between the first connection point and the first outdoor heat exchanger;

the air conditioner further includes:

a second control valve is arranged on the first communication pipe; and/or the presence of a gas in the gas,

and a third control valve is arranged on the second communicating pipe.

15. An air conditioner, comprising:

16. A control method of an air conditioner according to claim 14, characterized by comprising:

acquiring a refrigeration mode instruction;

and closing the fifth control valve and the sixth control valve according to the refrigeration mode command.

17. A control method of an air conditioner according to any one of claims 1 to 13, characterized by comprising:

acquiring a mode instruction;

the opening and closing of the first control valve is controlled according to the mode command.

18. The control method of an air conditioner according to claim 17, wherein a fourth control valve is provided on a first pipe between the first connection point and the first outdoor heat exchanger; the mode command is a heating mode command, and the step of controlling the opening and closing of the first control valve according to the mode command comprises the following steps:

19. The control method of an air conditioner according to claim 17, wherein the air conditioner further comprises: a fifth control valve provided on a third pipe between the second connection point and the second outdoor heat exchanger; a sixth control valve provided in a fourth pipe between the fourth connection point and the second discharge pipe;

the mode command is a refrigeration mode command, and the step of controlling the opening and closing of the first control valve according to the mode command comprises the following steps:

20. The control method of an air conditioner according to claim 17, wherein a second control valve is provided on the first communication pipe; and/or a third control valve is arranged on the second communicating pipe;

the mode command is a dehumidification and reheat mode command, and the step of controlling the opening and closing of the first control valve according to the mode command comprises the following steps: