Air conditioner and control method thereof

文档序号：647454 发布日期：2021-05-14 浏览：7次中文

阅读说明：本技术 空调器及其控制方法 (Air conditioner and control method thereof ) 是由雷俊杰于 2019-10-28 设计创作，主要内容包括：本发明公开一种空调器及其控制方法,其中,空调器包括室外单元和室内单元,室外单元包括压缩机构和室外换热器,室内单元包括第一室内换热器、第一节流调节装置,第二室内换热器以及第二室内节流装置；空调器还包括：排出管、吸入管,以及第一配管；其中,导通管与第一配管分别连通第二室内换热器的两个冷媒过口；恒高压管连接排出管和导通管；第二配管连接吸入管和第一连接点,其中,第一连接点为第二配管与导通管的连接点；第一控制阀设置于恒高压管上；第二控制阀设置于第二配管上；空调器的控制方法包括：获取模式指令；根据模式指令打开或者关闭第一控制阀和第二控制阀。本发明技术方案有利于提高空调器的适应性。(The invention discloses an air conditioner and a control method thereof, wherein the air conditioner comprises an outdoor unit and an indoor unit, the outdoor unit comprises a compression mechanism and an outdoor heat exchanger, the indoor unit comprises a first indoor heat exchanger, a first throttling regulation device, a second indoor heat exchanger and a second indoor throttling device; the air conditioner further includes: a discharge pipe, a suction pipe, and a first piping; the conduction pipe and the first piping are respectively communicated with two refrigerant passing ports of the second indoor heat exchanger; the constant high-pressure pipe is connected with the discharge pipe and the conduction pipe; the second pipe is connected with the suction pipe and the first connecting point, wherein the first connecting point is the connecting point of the second pipe and the conducting pipe; the first control valve is arranged on the constant high-pressure pipe; the second control valve is arranged on the second pipe; the control method of the air conditioner comprises the following steps: acquiring a mode instruction; the first control valve and the second control valve are opened or closed according to the mode command. The technical scheme of the invention is beneficial to improving the adaptability of the air conditioner.)

1. The control method of the air conditioner is characterized in that the air conditioner comprises an outdoor unit and an indoor unit, wherein the outdoor unit comprises a compression mechanism and an outdoor heat exchanger, and the indoor unit comprises a first indoor heat exchanger, a first throttling regulation device, a second indoor heat exchanger and a second indoor throttling device;

the air conditioner further includes: a discharge pipe connected to a discharge side of the compression mechanism, a suction pipe connected to a low-pressure suction side of the compression mechanism, and a first pipe connecting the discharge pipe, the outdoor heat exchanger, the first throttle adjusting device, the first indoor heat exchanger, the second indoor throttle device, the second indoor heat exchanger, and a conduction pipe in this order; the conduction pipe and the first piping are respectively communicated with two refrigerant passing ports of the second indoor heat exchanger;

the air conditioner also comprises a constant high pressure pipe which connects the discharge pipe and the conduction pipe, and a second pipe which connects the suction pipe and a first connection point, wherein the first connection point is the connection point of the second pipe and the conduction pipe; the first control valve is arranged on the constant high-pressure pipe, and the second control valve is arranged on the second pipe;

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

acquiring a mode instruction;

the first control valve and the second control valve are opened or closed according to the mode command.

2. The control method of an air conditioner according to claim 1, wherein the mode command is a cooling mode command, and the step of opening or closing the first and second control valves according to the mode command comprises:

closing the first control valve and opening the second control valve according to the refrigeration mode command;

and adjusting the opening degrees of the first throttling adjusting device and the second throttling adjusting device so as to refrigerate the first indoor heat exchanger and the second indoor heat exchanger.

3. The control method of an air conditioner according to claim 1, wherein the mode command is a cooling mode command, and the step of opening or closing the first and second control valves according to the mode command comprises:

closing the first control valve and opening the second control valve according to the dehumidification and reheating mode command;

and the opening degrees of the first throttling adjusting device and the second throttling adjusting device are adjusted so that the first indoor heat exchanger heats and the second indoor heat exchanger cools.

4. The control method of an air conditioner according to claim 1, wherein the outdoor unit further includes a switching device that is switchable between a first switching state in which the switching device communicates the first pipe with the discharge pipe and a second switching state in which the second pipe communicates with the suction pipe; in the second switching state, the switching device causes the first pipe to communicate with the suction pipe and causes the second pipe to communicate with the discharge pipe;

the mode command is a heating mode command, and the step of opening or closing the first control valve and the second control valve according to the mode command comprises:

according to the dehumidification and reheating mode command, adjusting a switching device to be in a second switching state, and opening a first control valve and/or a second control valve;

and adjusting the opening degrees of the first throttling adjusting device and the second throttling adjusting device so as to heat the first indoor heat exchanger and the second indoor heat exchanger.

5. The control method of an air conditioner according to claim 1, wherein the outdoor unit further includes a switching device that is switchable between a first switching state in which the switching device communicates the first pipe with the discharge pipe and a second switching state in which the second pipe communicates with the suction pipe; in the second switching state, the switching device causes the first pipe to communicate with the suction pipe and causes the second pipe to communicate with the discharge pipe;

the mode instruction is a heating and dehumidifying mode instruction, and the step of opening or closing the first control valve and the second control valve according to the mode instruction comprises the following steps:

according to the temperature-rising and dehumidifying mode instruction, adjusting the switching device to be in a second switching state, and opening the first control valve and/or the second control valve;

and the opening degrees of the first throttling adjusting device and the second throttling adjusting device are adjusted so that the first indoor heat exchanger can refrigerate and the second indoor heat exchanger can refrigerate.

6. The control method of an air conditioner according to claim 1, wherein the air conditioner further comprises a plurality of indoor units and first, second, and third connection pipes; the first connecting pipe and the constant high pressure pipe are connected to the second connecting point, the second connecting pipe and the second tubing are connected to the third connecting point, and the third connecting pipe and the first tubing are connected to the fourth connecting point; the plurality of indoor units are arranged on the first connecting pipe, the second connecting pipe and the third connecting pipe in parallel;

the indoor units comprise a first indoor unit and a second indoor unit, and the mode command comprises a cooling mode command of the first indoor unit and a heating mode command of the second indoor unit;

the step of opening or closing the first control valve and the second control valve according to the mode command includes:

closing the first control valve and opening the second control valve according to a cooling mode command of the first indoor unit; adjusting the opening degrees of the first throttling adjusting device and the second throttling adjusting device to enable the first indoor heat exchanger and the second indoor heat exchanger of the first indoor unit to refrigerate;

opening the first control valve and closing the second control valve according to a heating mode command of the second indoor unit; and adjusting the opening degrees of the first throttling adjusting device and the second throttling adjusting device so as to heat the first indoor heat exchanger and the second indoor heat exchanger of the second indoor unit.

7. The control method of an air conditioner according to claim 1, wherein the air conditioner further comprises a plurality of indoor units and first, second, and third connection pipes; the first connecting pipe and the constant high pressure pipe are connected to the second connecting point, the second connecting pipe and the second tubing are connected to the third connecting point, and the third connecting pipe and the first tubing are connected to the fourth connecting point; the plurality of indoor units are arranged on the first connecting pipe, the second connecting pipe and the third connecting pipe in parallel;

the indoor units comprise a first indoor unit and a second indoor unit, and the mode command comprises a dehumidification reheating mode command of the first indoor unit and a heating mode command of the second indoor unit;

the step of opening or closing the first control valve and the second control valve according to the mode command includes:

closing the first control valve and opening the second control valve according to a dehumidification and reheating mode command of the first indoor unit; adjusting the opening degrees of the first throttling adjusting device and the second throttling adjusting device so that the first indoor heat exchanger of the first indoor unit heats and the second indoor heat exchanger cools;

8. The control method of an air conditioner according to claim 1, wherein the air conditioner includes a three-way valve provided at a junction of the constant high pressure pipe, the first pipe and the second pipe so that the conduction pipe communicates with the second pipe and the constant high pressure pipe, respectively, and the make-and-break of the second pipe and the constant high pressure pipe can be controlled, respectively; the three-way valve replaces the first control valve and the second control;

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

according to the refrigeration mode instruction, the three-way valve is adjusted to cut off the constant high-pressure pipe and the first distribution pipe and conduct the first distribution pipe and the second distribution pipe;

9. The control method of an air conditioner according to claim 1, wherein the air conditioner includes a three-way valve provided at a junction of the constant high pressure pipe, the first pipe and the second pipe so that the conduction pipe communicates with the second pipe and the constant high pressure pipe, respectively, and the make-and-break of the second pipe and the constant high pressure pipe can be controlled, respectively; the three-way valve replaces the first control valve and the second control;

the outdoor unit further includes a switching device that is switchable between a first switching state in which the switching device communicates the first pipe with the discharge pipe and a second switching state in which the second pipe communicates with the suction pipe; in the second switching state, the switching device causes the first pipe to communicate with the suction pipe and causes the second pipe to communicate with the discharge pipe;

the mode command is a heating mode command, and the step of opening or closing the first control valve and the second control valve according to the mode command comprises:

according to the dehumidification and reheating mode command, the switching device is adjusted to be in a second switching state, and the three-way valve is adjusted to conduct the first pipe and the second pipe and/or conduct the first pipe and the constant high pressure pipe;

10. The control method of an air conditioner according to claim 1, wherein the air conditioner further comprises a water temperature adjusting module, the water temperature adjusting module comprises a water temperature adjusting pipeline, the water temperature adjusting pipeline is provided with two refrigerant through ports, one refrigerant through port is communicated with the constant high pressure pipe, and the other refrigerant through port is communicated with a first pipe between the first indoor throttling device and the outdoor heat exchanger; a third control valve is arranged on the second pipe;

the mode command is a heating command of the water temperature adjusting module, and the step of opening or closing the first control valve and the second control valve according to the mode command comprises the following steps of:

and according to the heating instruction of the water temperature adjusting module, adjusting the switching device to be in a second switching state, and closing the third control valve and/or closing the first control valve and the second control valve.

11. 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 respective steps of the control method of the air conditioner according to any one of claims 1 to 10 when executed by the processor.

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 can not control the temperature not to be reduced while dehumidifying, so that the dehumidification process affects the use of users.

Disclosure of Invention

The invention mainly aims to provide a control method of an air conditioner, aiming at enabling the air conditioner to have the functions of dehumidification and reheating and improving the comfort of a user in using the air conditioner.

In order to achieve the above object, the air conditioner provided by the present invention comprises an outdoor unit and an indoor unit, wherein the outdoor unit comprises a compression mechanism and an outdoor heat exchanger, and the indoor unit comprises a first indoor heat exchanger, a first throttling regulation device, a second indoor heat exchanger and a second indoor throttling device;

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

acquiring a mode instruction;

the first control valve and the second control valve are opened or closed according to the mode command.

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

closing the first control valve and opening the second control valve according to the refrigeration mode command;

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

closing the first control valve and opening the second control valve according to the dehumidification and reheating mode command;

Optionally, the outdoor unit further includes a switching device switchable between a first switching state in which the switching device communicates the first pipe and the discharge pipe and a second switching state in which the second pipe communicates with the suction pipe; in the second switching state, the switching device causes the first pipe to communicate with the suction pipe and causes the second pipe to communicate with the discharge pipe;

the mode command is a heating mode command, and the step of opening or closing the first control valve and the second control valve according to the mode command comprises:

according to the dehumidification and reheating mode command, adjusting a switching device to be in a second switching state, and opening a first control valve and/or a second control valve;

Optionally, the air conditioner further includes a plurality of indoor units, and first, second, and third connection pipes; the first connecting pipe and the constant high pressure pipe are connected to the second connecting point, the second connecting pipe and the second tubing are connected to the third connecting point, and the third connecting pipe and the first tubing are connected to the fourth connecting point; the plurality of indoor units are arranged on the first connecting pipe, the second connecting pipe and the third connecting pipe in parallel;

the step of opening or closing the first control valve and the second control valve according to the mode command includes:

Optionally, the air conditioner comprises a three-way valve, wherein the three-way valve is arranged at the joint of the constant high-pressure pipe, the first pipe and the second pipe, so that the conduction pipe is communicated with the second pipe and the constant high-pressure pipe respectively, and the on-off of the second pipe and the constant high-pressure pipe can be controlled respectively; the three-way valve replaces the first control valve and the second control;

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

the mode command is a heating mode command, and the step of opening or closing the first control valve and the second control valve according to the mode command comprises:

Optionally, the air conditioner further comprises a water temperature adjusting module, wherein the water temperature adjusting module comprises a water temperature adjusting pipeline, the water temperature adjusting pipeline is provided with two refrigerant through ports, one refrigerant through port is communicated with the constant high pressure pipe, and the other refrigerant through port is communicated with a first pipe between the first indoor throttling device and the outdoor heat exchanger; a third control valve is arranged on the second pipe;

and adjusting the switching device to be in a second switching state according to the heating instruction of the water temperature module, and closing the third control valve and/or closing the first control valve and the second control valve.

The present invention further provides an air conditioner, the air conditioner comprising a memory, a processor, and a control program of the air conditioner stored in the memory and operable on the processor, the control program of the air conditioner implementing the steps of the control method of the air conditioner when executed by the processor, wherein the control method of the air conditioner comprises:

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

acquiring a mode instruction;

the first control valve and the second control valve are opened or closed according to the mode command.

In the technical scheme of the invention, a first pipe is sequentially connected with a discharge pipe, an outdoor heat exchanger, a first throttling regulation device, a first indoor heat exchanger, a second indoor throttling regulation device, a second indoor heat exchanger and a conduction pipe; the indoor unit can be switched between a refrigeration mode and a dehumidification and reheating mode by opening and closing the first control valve and the second control valve to adjust the opening of the first throttling adjusting device and the second throttling adjusting device, so that the air conditioner has a dehumidification function to meet different requirements of users while meeting high-humidity weather; in the control process of the air conditioner, the first control valve and the second control valve can be opened or closed according to the acquired mode instruction, namely the first control valve is controlled to be opened or closed, so that the refrigerant circulating system of the air conditioner can realize different situations, and different working modes of the air conditioner are realized.

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 view of an air conditioner according to an embodiment of the present invention;

FIG. 2 is a schematic view showing an internal structure of the economizer of FIG. 1;

FIG. 3 is a schematic view of an air conditioner with an outdoor unit according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an air conditioner according to another embodiment of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Outdoor unit	110	Compressor
111	Discharge pipe	120	Gas-liquid separator
				131	Switching device	133	Fourth control valve
134	One-way valve	140	First piping
				141	Outdoor side heat exchanger	142	Outdoor side throttling regulating device
143	Economizer	144	Liquid-taking throttle valve
				145	Liquid taking tube	146	Return pipe
147	Second communicating pipe	148	First communicating pipe
				149	Fifth control valve	150	Second piping
160	Constant high-pressure pipe	152	Third connecting point
				153	Third control valve	151	Second control valve
200	Indoor unit	220	Second indoor heat exchanger
				210	First indoor heat exchanger	230	First throttle adjusting device
240	Second throttle adjusting device	250	First connecting pipe
				260	Second connecting pipe	270	Third connecting pipe
271	Fourth connecting point	211	First connecting point
				162	Second connecting point	P	Exhaust port
M	Medium pressure air suction inlet	S	Low-pressure air suction port
				113	Low-pressure suction pipe	180	Conduction pipe
143a	First refrigerant flow path	143b	Second refrigerant flow path
				500	Water temperature adjusting module	161	First control valve

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.

Hereinafter, a specific piping structure of the air conditioner will be mainly described.

Referring to fig. 1 to 4, first, the entire piping structure and component arrangement of the air conditioner will be described; in the embodiment of the present invention, the air conditioner includes an outdoor unit 100 and an indoor unit 200, the outdoor unit 100 includes a compressor 110 and an outdoor heat exchanger, the indoor unit 200 includes a first indoor heat exchanger 210, a first throttling device 230, a second indoor unit 200 and a second indoor throttling device;

the air conditioner further includes: a discharge pipe 111 connected to a discharge side of the compressor 110, a suction pipe connected to a low pressure suction side of the compressor 110, and a first pipe 140 connecting the discharge pipe 111, the outdoor heat exchanger, the first throttle control device 230, the first indoor heat exchanger 210, the second indoor throttle device, and the second indoor heat exchanger 220 in this order, and a communication pipe 180; the conduction pipe 180 and the first pipe 140 are respectively communicated with two refrigerant passing ports of the second indoor heat exchanger 220;

a constant high pressure pipe 160, the constant high pressure pipe 160 connecting the discharge pipe 111 and the conduction pipe 180;

a second pipe 150, wherein the second pipe 150 connects the suction pipe and the first connection point 211, and the first connection point 211 is a connection point between the second pipe 150 and the conducting pipe 180;

a first control valve 161, the first control valve 161 being provided on the constant-pressure pipe 160;

and a second control valve 151, wherein the second control valve 151 is provided in the second pipe 150.

Specifically, in the present embodiment, the first control valve 161 and the second control valve 151 may be solenoid valves for controlling the on/off of the constant high-pressure pipe 160 and the second pipe 150. The first throttle adjusting device 230 and the second throttle adjusting device 240 may be electronic throttle valves, such as electronic expansion valves. It should be noted that the form of the conducting pipe 180 may be many, and specifically, the conducting pipe 180 is a part of any one of the constant high pressure pipe 160, the first pipe 140 and the second pipe 150. That is, the conducting pipe 180 may be provided independently, or may be an extension of the first pipe 140, an extension of the second pipe 150, or an extension of the constant-pressure pipe 160.

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

acquiring a mode instruction;

there are many ways to obtain the mode instruction, which may be a control instruction sent by a user, or a control instruction obtained by the air conditioner from one or more locations of a terminal, other home devices, a server, a cloud, and the like. Of course, the control command may also be generated by the main control circuit of the air conditioner according to the acquired air parameters such as temperature and humidity, and in some embodiments, the time, duration, and other parameters may also be considered to generate the control command. The mode commands may include a cooling mode command, a heating mode command, a dehumidification and reheat mode command, a heating and dehumidification mode command, a water temperature adjustment module heating command, and the like.

The first control valve and the second control valve are opened or closed according to the mode command.

On the basis of the refrigerant pipeline, when only one indoor unit 200 is provided, the first control valve 161 and the second control valve 151 are controlled to be opened and closed, so that the air-conditioning indoor unit 200 can realize any one of dehumidification reheating and refrigeration; when the switching device is installed such that the discharge pipe 111 communicates with the second pipe 150 and the suction pipe communicates with the first pipe 140, it is possible to achieve either heating or temperature-raising dehumidification.

When the number of the indoor units 200 is plural and there is an indoor heat exchanger of the indoor unit 200 that needs to perform cooling (which needs to comply with energy conservation), the above-described piping structure can also perform heating and temperature-rise dehumidification (without providing a switching device). That is, when the number of the indoor units 200 is plural, different indoor units 200 may implement various modes of cooling, heating, dehumidification and reheating, and temperature rise and dehumidification as needed.

The following is a detailed description of various modes:

a refrigeration mode:

the high-temperature and high-pressure refrigerant is discharged from the discharge pipe, sequentially passes through the first pipe 140, the outdoor heat exchanger 141, and the economizer 143, and sequentially passes through the first throttle controller 230, the first indoor heat exchanger 210, the second indoor throttle controller, the second indoor heat exchanger 220, and the conduction pipe 180. The first indoor heat exchanger 210 and the second indoor heat exchanger 220 are simultaneously cooled by adjusting the opening degrees of the first throttling device 230 and the second throttling device 240. The refrigerant flows into the second pipe 150 through the conducting pipe 180, sequentially passes through the second control valve 151 and the suction pipe, and then returns to the compressor 110. In this process, the first control valve 161 is closed or opened, and the second control valve 151 is opened, taking the closing as an example.

That is, the mode command is a cooling mode command, and the step of opening or closing the first and second control valves according to the mode command includes:

closing the first control valve and opening the second control valve according to the refrigeration mode command;

Dehumidification reheating mode:

the high-temperature and high-pressure refrigerant is discharged from the discharge pipe, sequentially passes through the first pipe 140, the outdoor heat exchanger 141, and the economizer 143, and sequentially passes through the first throttle controller 230, the first indoor heat exchanger 210, the second indoor throttle controller, the second indoor heat exchanger 220, and the conduction pipe 180. Through the opening adjustment of the first throttle adjusting device 230 and the second throttle adjusting device 240, the first indoor heat exchanger 210 heats, and the second indoor heat exchanger 220 cools, so that the air is firstly cooled and dehumidified by the second indoor heat exchanger 220, and then is heated and returned to the temperature by the first indoor heat exchanger 210. The refrigerant flows into the second pipe 150 through the conducting pipe 180, sequentially passes through the second control valve 151 and the suction pipe, and then returns to the compressor 110. In this process, the first control valve 161 is closed or opened, and for example, the first control valve 161 is closed, and the second control valve 151 is opened.

That is, when the mode command is a cooling mode command, the step of opening or closing the first control valve and the second control valve according to the mode command includes:

closing the first control valve and opening the second control valve according to the dehumidification and reheating mode command;

Of course, in some embodiments, in order to improve the heat exchange efficiency between the indoor heat exchanger and the indoor air, the indoor unit 200 further includes a heat circulating device for sending the heat or the cold of the indoor unit 200 into the room; wherein, the heat cycle device may be a wind wheel in some embodiments, and the wind wheel rotates to deliver the air after exchanging heat with the primary heat exchanger and the second indoor heat exchanger 220 to the indoor. Of course, in other embodiments, the heat circulation device may also be a water circulation device, and the first indoor heat exchanger 210 and the second indoor heat exchanger 220 send heat or cold into the room through the circulating water flowing in the water circulation device.

In this embodiment, the first pipe 140 is connected to the discharge pipe 111, the outdoor heat exchanger, the first throttle control device 230, the first indoor heat exchanger 210, the second indoor throttle control device, the second indoor heat exchanger 220, and the conduction pipe 180 in this order; the discharge pipe 111 and the conduction pipe 180 are connected through the second piping 150, the discharge pipe 111 and the conduction pipe 180 are communicated through the constant high pressure pipe 160, the first control valve 161 is arranged on the constant high pressure pipe 160 to control the on-off of the constant high pressure pipe 160, the second control valve 151 is arranged on the second piping 150 to control the on-off of the second piping 150, the opening degree of the first throttling regulation device 230 and the second throttling regulation device 240 is regulated by opening and closing the first control valve 161 and the second control valve 151, so that the indoor unit 200 can be switched between a refrigeration mode and a dehumidification and reheating mode, and the air conditioner has a dehumidification function to cope with high humidity weather and a refrigeration function to meet different requirements of users.

It should be noted that, in some embodiments, the first control valve 161 and the second control valve 151 in the above embodiments may be replaced by three-way valves in order to simplify the piping structure. The air conditioner includes a three-way valve provided at a junction of the constant high pressure pipe 160, the first piping 140, and the second piping 150 so that the conduction pipe 180 communicates the second piping 150 and the constant high pressure pipe 160, respectively, and can control on/off of the second piping 150 and the constant high pressure pipe 160, respectively; the three-way valve replaces the first control valve 161 and the second control.

Specifically, the conduction pipe 180, the second pipe 150, and the constant high pressure pipe 160 are connected to the first connection point 211. In this case, a three-way valve may be provided at the first connection point 211 instead of two-way valves. The three-way valve realizes that the conduction pipe 180 is respectively communicated with the second piping 150 and the constant high pressure pipe 160, and can respectively control the connection and disconnection between the conduction pipe 180 and the constant high pressure pipe 160 and the connection and disconnection between the conduction pipe 180 and the second piping 150.

When the three-way valve is used for replacing the first control valve and the second control valve, the control of the on-off of the first control valve and the second control valve is replaced by adjusting the communication condition of the three-way valve so as to realize the communication between the first pipe and the second pipe and/or the communication between the first pipe and the constant high pressure pipe.

The following description will be made of two examples of cooling and heating.

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

With the switching means:

the mode command is a heating mode command, and the step of opening or closing the first control valve and the second control valve according to the mode command comprises:

In some embodiments, in order to enable the indoor unit 200 to realize more operation modes, the outdoor unit 100 further comprises a switching device 131, the switching device 131 can be switched between a first switching state and a second switching state,

in the first switching state, the switching device 131 communicates the first pipe 140 with the discharge pipe 111, and the second pipe 150 communicates with the suction pipe; in the second switching state, the switching device 131 causes the first pipe 140 to communicate with the suction pipe, and the second pipe 150 to communicate with the discharge pipe 111. Wherein, the switching device 131 may be a four-way valve.

Switching device 131 is provided between discharge pipe 111, suction pipe, first pipe 140, and second pipe 150, and allows discharge pipe 111 to communicate with first pipe 140 or second pipe 150, and allows suction pipe to communicate with second pipe 150 or first pipe 140. In the first switching state, the operation modes that can be realized by the indoor unit 200 have been described in the above embodiments, and are not described herein again, and the following description mainly refers to the second switching state.

Heating mode:

the high-temperature and high-pressure refrigerant is discharged from the discharge pipe, sequentially passes through the second pipe 150, the second control valve 151, and the conduction pipe 180, sequentially passes through the second indoor heat exchanger 220, the second indoor throttling device, the first indoor heat exchanger 210, the first throttling adjustment device 230, and the outdoor heat exchanger, and then returns to the compressor 110 through the return pipe 146. By adjusting the opening degrees of the first throttling device 230 and the second throttling device 240, the first indoor heat exchanger 210 and the second indoor heat exchanger 220 simultaneously heat and the outdoor heat exchanger cools. At this time, the second control valve 151 is opened.

Or, the high-temperature and high-pressure refrigerant is discharged from the discharge pipe, sequentially passes through the constant high-pressure pipe 160, the first control valve 161 and the conducting pipe 180, sequentially passes through the second indoor heat exchanger 220, the second indoor throttling device, the first indoor heat exchanger 210, the first throttling regulation device 230 and the outdoor heat exchanger, and then returns to the compressor 110 through the return pipe 146. By adjusting the opening degrees of the first throttling device 230 and the second throttling device 240, the first indoor heat exchanger 210 and the second indoor heat exchanger 220 simultaneously heat and the outdoor heat exchanger cools. At this time, the first control valve 161 is opened.

Of course, in some embodiments, the upper two flow paths may exist simultaneously, and depending on the control of the first and second control valves 161 and 151, the upper two flow paths operate simultaneously when the first and second control valves 161 and 151 are simultaneously opened.

The mode command is a heating mode command, and the step of opening or closing the first control valve and the second control valve according to the mode command comprises:

according to the dehumidification and reheating mode command, adjusting a switching device to be in a second switching state, and opening a first control valve and/or a second control valve;

A heating and dehumidifying mode:

the high-temperature and high-pressure refrigerant is discharged from the discharge pipe, sequentially passes through the second pipe 150, the second control valve 151, and the conduction pipe 180, sequentially passes through the second indoor heat exchanger 220, the second indoor throttling device, the first indoor heat exchanger 210, the first throttling adjustment device 230, and the outdoor heat exchanger, and then returns to the compressor 110 through the return pipe 146. By adjusting the opening degrees of the first throttling device 230 and the second throttling device 240, the first indoor heat exchanger 210 cools, the second indoor heat exchanger 220 heats, and the outdoor heat exchanger cools. At this time, the second control valve 151 is opened.

Or, the high-temperature and high-pressure refrigerant is discharged from the discharge pipe, sequentially passes through the constant high-pressure pipe 160, the first control valve 161 and the conducting pipe 180, sequentially passes through the second indoor heat exchanger 220, the second indoor throttling device, the first indoor heat exchanger 210, the first throttling regulation device 230 and the outdoor heat exchanger, and then returns to the compressor 110 through the return pipe 146. By adjusting the opening degrees of the first throttling device 230 and the second throttling device 240, the first indoor heat exchanger 210 cools, the second indoor heat exchanger 220 heats, and the outdoor heat exchanger cools. At this time, the first control valve 161 is opened.

The mode instruction is a heating and dehumidifying mode instruction, and the step of opening or closing the first control valve and the second control valve according to the mode instruction comprises the following steps:

In some embodiments, in order to better adjust the supercooling degree of the outdoor heat exchanger, the air conditioner further includes an outdoor side throttling adjustment device 142, and the outdoor side throttling adjustment device 142 is located on the first pipe 140 between the economizer 143 and the outdoor side heat exchanger 141. In embodiments without the economizer 143, the outdoor side throttling device 142 is located on the first piping 140 between the outdoor heat exchanger and the first indoor throttling device. The outdoor side throttle adjusting means 142 comprises an outdoor throttle valve.

In some embodiments, in order to reduce the pressure loss of the refrigerant in the first pipe 140, the air conditioner further includes a first check valve 134, and the first check valve 134 is connected in parallel to the outdoor throttling adjustment device 142. The conducting direction of the first check valve 134 can be set according to different working condition requirements, and the first check valve can be set to be in one-way conduction from the outdoor heat exchanger to the first indoor throttling device, or can be set to be in one-way conduction from the first indoor throttling device to the outdoor heat exchanger, for example. When throttling is not necessary, the valve is opened as much as possible by the check valve 134, and when throttling is necessary, the outdoor throttle control device 142 is opened. The outdoor side throttle adjusting means 142 may be an electromagnetic throttle valve. In some embodiments, when the outdoor-side throttling adjustment device 142 is a large-diameter throttle valve, the first check valve 134 may not be provided; when the outdoor side throttling regulation device 142 is a small-diameter throttling valve, the first check valve 134 is arranged as much as possible to relieve the pressure in the throttling device, so that the throttling device is protected.

In some embodiments, the air conditioner further includes a plurality of indoor units 200, and the heat exchanger types included in the respective indoor units 200 may be different, such as an indoor unit with a constant temperature dehumidification function (having both the first indoor heat exchanger 210 and the second indoor heat exchanger 220), an ordinary cooling/heating indoor unit (having only one heat exchanger and a corresponding throttling device), and an indoor unit with a switching device capable of freely switching a cooling or heating state, which may be one or more, so that the air conditioner may simultaneously perform hybrid operations of dehumidification, reheating, cooling, heating, dehumidification, etc.

Specifically, the air conditioner further includes a plurality of indoor units 200, and first, second, and third connection pipes 250, 260, and 270; the first connection pipe 250 and the constant high pressure pipe 160 are connected to the second connection point 162, the second connection pipe 260 and the second piping 150 are connected to the third connection point 152, and the third connection pipe 270 and the first piping 140 are connected to the fourth connection point 271; the plurality of indoor units 200 are disposed in parallel on the first connection pipe 250, the second connection pipe 260, and the third connection pipe 270 or disposed in parallel on the second connection pipe 260 and the third connection pipe 270.

The first connection pipe 250 branches off from the second connection point 162 of the first pipe 140, the second connection pipe 260 branches off from the second pipe 150, the second connection point 162 is located in the constant-pressure pipe 160 between the first control valve 161 and the discharge pipe 111, the third connection point 152 is located in the second pipe 150 between the second control valve 151 and the suction pipe, and the fourth connection point 271 is located in the first pipe 140 where the first throttling device 230 and the outdoor throttling device are directly connected. Correspondingly, the first control valve 161 is located on the constant high pressure pipe 160 between the first connection point 211 and the second connection point 162; the second control valve 151 is located in the second pipe 150 between the first connection point 211 and the third connection point 152.

Thus, the plurality of indoor units 200 are simultaneously connected to the refrigerant circulation system, and when different indoor units 200 require different modes, the refrigerant can selectively flow from one indoor unit 200 to another indoor unit 200, for example, two indoor units 200 are taken as a simple example. When the switching device 131 is in the first switching state, that is, when the discharge pipe 111 communicates with the first pipe 140 and the suction pipe communicates with the second pipe 150, one indoor unit 200 needs to be heated and the other indoor unit 200 needs to be cooled. At this time, the high-temperature and high-pressure refrigerant flows out of the discharge pipe 111, passes through the constant high-pressure pipe 160 and the first control valve 161, and enters the first indoor heat exchanger 210 and the second indoor heat exchanger 220 to perform heating. The refrigerant flows out of the second indoor heat exchanger 220, enters the first connection pipe 250, flows into the cooling indoor unit 200 through the first connection pipe 250, and sequentially passes through the first indoor heat exchanger 210 and the second indoor heat exchanger 220 of the cooling indoor unit 200 to be cooled. The first control valve 161 of the heating indoor unit 200 is opened and the second control valve 151 is closed.

The first control valve 161 of the cooling indoor unit 200 is closed, the second control valve 151 is opened, and the refrigerant of high temperature and high pressure passes through the discharge pipe 111, enters the outdoor heat exchanger through the first pipe 140 to be heated, passes through the first indoor heat exchanger 210 and the second indoor heat exchanger 220 of the cooling indoor unit 200 in sequence to be cooled, passes through the conduction pipe 180, the second pipe 150 and the suction pipe in sequence, and flows back to the compressor 110, thereby realizing a large circulation of the refrigerant.

In general, the high-temperature and high-pressure refrigerant discharged from the discharge pipe 111 flows through two paths, one path is first introduced into the heating indoor unit 200 to heat, then introduced into the cooling indoor unit 200 to cool, and then returned to the compressor 110 through the second pipe 150 and the suction pipe; the other is to release heat through the outdoor heat exchanger, enter the indoor unit 200 for cooling, and return the heat to the compressor 110 through the second pipe 150 and the suction pipe. When the air conditioner is provided with a plurality of indoor units 200, the trend of the refrigerant is more flexible, so that different requirements of people are met, and the adaptability and the energy efficiency of the air conditioner are greatly improved.

When having a plurality of indoor units indoor to having first indoor unit and second indoor unit as the example and explaining, different circumstances can be realized to the mode of operation, so, can be better satisfy different users' demand, simultaneously, realize the intelligent utilization of energy.

The following examples illustrate:

when the first indoor unit receives the cooling mode command, the second indoor unit receives the heating mode command:

the mode command comprises a cooling mode command of the first indoor unit and a heating mode command of the second indoor unit;

the step of opening or closing the first control valve and the second control valve according to the mode command includes:

When the first indoor unit receives the dehumidification reheating mode command, and the second indoor unit receives the heating mode command:

the mode commands comprise a dehumidification and reheating mode command of the first indoor unit and a heating mode command of the second indoor unit;

the step of opening or closing the first control valve and the second control valve according to the mode command includes:

In some embodiments, the air conditioner can also be used for adjusting the water temperature, and the water after heat exchange can be used as domestic water and can also be used as floor heating water. The air conditioner further comprises a water temperature adjusting module 500, wherein the water temperature adjusting module 500 comprises a water temperature adjusting pipeline, the water temperature adjusting pipeline is provided with two refrigerant passing ports, one refrigerant passing port is communicated with the constant high-pressure pipe 160, and the other refrigerant passing port is communicated with the first distribution pipe 140 between the first indoor throttling device and the outdoor heat exchanger. The refrigerant enters the water temperature adjusting pipe through the constant high pressure pipe 160, enters the first pipe 140, passes through the outdoor heat exchanger and the suction pipe, and then returns to the compressor 110.

The air conditioner is also used for supplying water for floor heating or preparing domestic water for people.

When the air conditioner further comprises a floor heating module, the air conditioner further comprises a heat exchange water tank and a floor heating water flow pipe communicated with the heat exchange water tank; a floor heating heat exchanger is arranged in the heat exchange water tank, a refrigerant inlet of the floor heating heat exchanger is communicated with a constant high pressure pipe 160, a refrigerant outlet of the floor heating heat exchanger is communicated with a first pipe 140, and a third control valve 153 is arranged on a second pipe 150.

Specifically, in this embodiment, ground heating water pipe can bury underground in the middle of ground or the wall, ground heating water pipe and heat exchange water tank intercommunication, and water among the heat exchange water tank can be at ground heating water pipe mesocycle for the temperature in the ground heating water pipe is equivalent with the temperature in the heat exchange water tank. When a high-temperature and high-pressure refrigerant passes through the floor heating heat exchanger, the floor heating heat exchanger exchanges heat with water in a heat exchange water tank to heat cold water in the water tank; when low-temperature coolant passes through, the ground heating heat exchanger exchanges heat with water in the heat exchange water tank to cool the water in the heat exchange water tank. When the floor heating heat exchanger works, the third control valve 153 can be selectively closed (closed when the floor heating is required to be efficiently heated), at the moment, accumulation of refrigerants in the indoor heat exchanger is reduced, and the outdoor unit 100 mainly serves the floor heating heat exchanger so as to improve the heat exchange efficiency of the floor heating heat exchanger.

In some further embodiments, the air conditioner further includes a water treatment device including a water heat exchanger for heating or cooling water in a water container and the water container, and the water heat exchanger is connected to the first connection pipe 250 and the third connection pipe 270 in parallel with the indoor unit 200. The water heat exchanger heats or refrigerates water in the water container, of course, the water containers can be multiple, and the water heat exchangers can also be multiple and arranged in parallel, so that one water container can contain hot water, and the other water container can contain cold water, and the cold water and the hot water can be supplied simultaneously. When hot water is required to be produced, high-temperature refrigerants pass through the water heat exchanger, so that heat energy is transferred to water in the container; when the refrigeration water is needed, the low-temperature refrigerant passes through the water heat exchanger, so that the cold energy is transferred to the water in the container.

The following description will be given by taking an example of heating the water temperature adjusting module:

That is, in the case where the switching device is provided (the switching device is in the second switching state), the water temperature adjusting module is heated, and in order to make the heating effect of the water temperature adjusting module remarkable or to ensure the heating efficiency of the water temperature adjusting module, the refrigerant of high temperature and high pressure is controlled to preferentially pass through the water temperature adjusting module and to be restricted from flowing into the indoor heat exchanger.

Specifically, when the third control valve is closed, the refrigerant cannot enter the indoor heat exchanger through the second pipe, and the high-temperature and high-pressure refrigerant enters the water temperature adjusting module through the constant high-pressure pipe to be heated, and then flows through the outdoor heat exchanger to flow back into the compressor. Under the condition, the amount of the high-temperature and high-pressure refrigerant distributed to the water temperature adjusting module can be controlled by adjusting the opening degree of the first indoor throttling adjusting device and/or the second indoor throttling adjusting device (when the first indoor throttling adjusting device and/or the second indoor throttling adjusting device are closed, the refrigerant completely passes through the water temperature adjusting module), so that the water temperature adjusting module and the indoor heat exchanger can work simultaneously and work as required.

When the first control valve and the second control valve are closed, the refrigerants in the second piping and the constant-pressure pipe cannot enter the indoor heat exchanger, and only can enter the water temperature adjusting module through the constant-pressure pipe for heat exchange, and then flow back to the low-pressure suction port of the compressor through the first piping and the outdoor heat exchanger. At this time, if the third control valve is closed again, the high-temperature and high-pressure refrigerant will not enter the room, thereby reducing the accumulation amount of the high-temperature and high-pressure refrigerant in the pipeline.

In some embodiments, to improve the ability of the air conditioner to heat at low temperatures, the air conditioner further comprises an economizer 143; the economizer 143 is provided in the first pipe 140 between the outdoor heat exchanger and the first throttling regulation, and a return pipe 146 of the economizer 143 communicates with the medium-pressure suction port of the compressor 110. The return pipe 146 may have various forms, and the return pipe 146 may include only the body of the return pipe 146, or may include the body of the return pipe 146 and a first communication pipe 148, one end of the first communication pipe 148 is communicated with the body of the return pipe 146, and the other end is communicated with the medium-pressure suction port of the compressor 110.

A fourth control valve 133 is provided in the return line 146 or in a first communication line 148 between the return line 146 and the medium pressure suction port of the compressor 110. The compressor 110 in this case is a vapor injection enthalpy compressor 110, and has a low pressure suction port and an intermediate pressure suction port.

The economizer 143 has a throttling function, a first refrigerant flow path 143a and a second refrigerant flow path 143b are arranged in the economizer 143, and two ends of the first refrigerant flow path 143a are respectively communicated with the first piping 140 at two ends of the economizer 143; one end of the second refrigerant passage 143b is connected to the first pipe 140 via a liquid taking pipe 145, and the other end is connected to a medium-pressure suction port of the compressor 110 via a return pipe 146; a liquid extraction throttle 144 is provided in the liquid extraction pipe 145. One end of the first refrigerant fluid communicates with a refrigerant inlet of the economizer 143, and the other end communicates with a refrigerant outlet of the economizer 143. The liquid extraction pipe 145 has one end communicating with the first pipe 140 and the other end communicating with the second refrigerant passage 143b, and the return pipe 146 has one end communicating with the medium-pressure suction port of the compressor 110 and the other end communicating with the second refrigerant passage 143 b.

As described above, referring to the refrigerant flow path in the heating mode, the high-temperature and high-pressure refrigerant flows out of the discharge pipe 111 of the compressor 110, passes through the constant high-pressure pipe 160 or the second pipe 150, enters the conduction pipe 180, passes through the second indoor heat exchanger 220 and the first indoor heat exchanger in sequence to perform heating, and flows back to the low-pressure suction port of the compressor 110 along the first pipe 140 after passing through the economizer 143, the outdoor throttle adjusting device 142, the outdoor heat exchanger, and the suction pipe.

The liquid refrigerant enters the economizer 143 and is divided into two parts: the first part directly enters an outdoor heat exchanger for evaporation and heat absorption after being throttled and reduced in pressure by an outdoor throttling adjusting device 142 (an electronic expansion valve), the second part enters an economizer 143 for heat absorption and evaporation after being throttled and reduced in pressure by a liquid taking throttle valve 144 (the electronic expansion valve), the evaporated medium-pressure saturated steam enters a medium-pressure air suction port of the compressor 110 through a return pipe 146, a fourth control valve 133 and a communicating pipe and is mixed with a refrigerant of a low-pressure air suction port of the compressor 110 for compression, the problems of small refrigerant flow, low return air pressure, high compression ratio and the like in a low-temperature environment are solved, and the low-temperature heat production capacity and the reliability of the system are improved. By the technology of the invention, when the outdoor environment temperature is low, the refrigerant suction amount of the compressor 110 in the low-temperature environment is increased through the system design of the enhanced vapor injection compressor 110 and the economizer 143, so that the low-temperature heating capacity is improved, the compression ratio in the low-temperature environment is reduced, and the reliability of the system can be improved.

In order to improve the liquid extraction effect, the inflow end of the liquid extraction pipe 145 is communicated with the first pipe 140 between the economizer 143 and the outdoor heat exchanger, and in other embodiments, the inflow end of the liquid extraction pipe 145 can also be communicated with the first pipe 140 between the economizer 143 and the first intersection. That is, the refrigerant flows in from the refrigerant outflow end of the economizer 143, which is advantageous for improving the reliability of liquid extraction.

In other embodiments, in order to avoid the unpleasant noise generated when the refrigerant in the vapor-liquid two-phase state passes through the indoor throttling device, the air conditioner further includes a gas-liquid separator 120 and an economizer 143, wherein the gas-liquid separator 120 is disposed on the low-pressure suction pipe 113; the economizer 143 is provided in the first pipe 140 between the outdoor heat exchanger and the first indoor throttle device, and a return pipe 146 of the economizer 143 communicates with the gas-liquid separator 120. The return pipe 146 may have various forms, and the return pipe 146 may include only the body of the return pipe 146, or may include the body of the return pipe 146 and a second connection pipe 147, where one end of the second connection pipe 147 is connected to the body of the return pipe 146, and the other end is connected to the gas-liquid separator 120.

For convenience of control, in some examples, the return pipe 146 is communicated with the gas-liquid separator 120 through the low pressure suction pipe 113, and the fifth control valve 149 is disposed on the return pipe 146 or a second communication pipe between the return pipe 146 and the low pressure suction pipe 113.

The invention further reduces the condensation temperature of the refrigerant at the outlet of the outdoor heat exchanger by adopting the system design with the economizer 143 on the basis of the three-pipe dehumidification reheating scheme and controlling the liquid taking throttle valve 144 (electronic expansion valve) in the system design loop with the economizer 143, improves the supercooling degree, leads the refrigerant to be completely condensed into liquid state, leads the liquid refrigerant to enter the indoor heat exchanger for heat absorption and evaporation after being throttled and decompressed by the indoor electronic expansion valve, and can solve the abnormal sound of the refrigerant generated by the gas-liquid two-phase state when the refrigerant passing through the indoor throttling device is in the full liquid state.

After the discharge of the compressor 110 is switched by the switching device 131, the high-pressure and high-temperature gaseous refrigerant enters the outdoor heat exchanger for condensation and heat exchange, and the gas-liquid two-phase medium-temperature and high-pressure refrigerant coming out of the outdoor heat exchanger enters the economizer 143 and then is divided into two parts: the first part is throttled and depressurized by the liquid taking throttle valve 144, then enters the economizer 143 through the liquid taking pipe 145 to absorb heat and evaporate, the evaporated gaseous refrigerant passes through the return pipe 146, the fifth control valve 149 (solenoid valve) and the communicating pipe enter the gas-liquid separator 120, then is mixed with the gaseous refrigerant subjected to heat absorption and evaporation by the indoor heat exchanger, and then enters the air suction port of the compressor 110, the second part is further condensed and heat exchanged from the economizer 143, the gas-liquid two-phase refrigerant is changed into a pure liquid refrigerant, and the pure liquid refrigerant flows indoors, throttled and depressurized by the dehumidification throttle valve and the reheating throttle valve and then enters the first indoor heat exchanger 210 and the second indoor heat exchanger 220 to absorb heat and evaporate. The refrigerant entering the first throttling regulation device 230 and the second throttling regulation device 240 (electronic expansion valve) changes from a gas-liquid two-phase state to a pure liquid state, so that the problem of refrigerant noise generated when the gas-liquid two-phase refrigerant passes through the throttling device is solved.

In this embodiment, according to the technical scheme of the present invention, the condensation temperature of the refrigerant at the outlet of the outdoor heat exchanger can be further reduced, the supercooling degree is increased, the refrigerant is completely condensed from a gas-liquid two-phase state to a liquid state, the liquid refrigerant enters the indoor heat exchanger to absorb heat and evaporate after being throttled and depressurized by the indoor electronic expansion valve (the first throttle adjusting device 230 and the second throttle adjusting device 240), and when the refrigerant passing through the indoor throttle device (the first throttle adjusting device 230 and the second throttle adjusting device 240) is in a full liquid state, the problem of refrigerant abnormal sound generated by the gas-liquid two-phase refrigerant passing through the throttle device can be solved, so as to improve the satisfaction degree of users

It should be noted that in some embodiments, the return pipe 146 is connected to the intermediate-pressure suction port of the compressor 110 and the gas-liquid separator 120 through different connection pipes, and in this case, the fourth control valve 133 (close to the compressor 110) and the fifth control valve 149 (close to the gas-liquid separator 120) are respectively disposed on the two connection pipes (the first connection pipe 148 and the second connection pipe 147). The return line 146 in this case includes the body of the return line 146 and two communication pipes. In the heating mode, the fifth control valve 149 is closed, and the fourth control valve 133 is opened, so that the refrigerant flows into the compressor 110, thereby improving the heating capacity; and in the cooling mode or the constant-temperature dehumidification mode, the fourth control valve is closed, and the fifth control valve is opened to eliminate abnormal sound. Of course, in some embodiments, the fifth control valve 149 may be closed and the fourth control valve opened as required by particular operating conditions. The arrangement is such that the air conditioner can adjust the fourth control valve 133 and the fifth control valve according to specific conditions, thereby improving the heating capacity of the air conditioner in the heating mode and reducing noise in the cooling and constant temperature dehumidification modes.

Regarding the specific connection between the compressor 110 and the economizer 143, the compressor 110 is an enhanced vapor injection compressor 110, and the compressor 110 has a conventional high pressure discharge port P, a low pressure suction port S, and a medium pressure suction port M (i.e., a vapor injection port) through which medium pressure refrigerant vapor enters the compressor 110 to increase the effective flow rate of the refrigerant.

The port a of the economizer 143 is connected to one end of the outdoor heat exchanger, the port b of the economizer 143 is connected to the fourth connection point 271 or the first throttling regulation device 230, the port c of the economizer 143 is connected to the liquid taking pipe 145, the port d of the economizer 143 is connected to the return pipe 146, the liquid taking throttle valve 144 is connected in series to the liquid taking pipe 145, the fourth control valve is connected in series to the connection pipe, the fifth control valve is connected in series to another connection pipe, one end of the connection pipe is connected to the medium pressure suction port M of the compressor 110, and the other connection pipe is connected to the inlet end of the gas-liquid separator 120.

The present invention further provides an air conditioner including 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 implementing the steps of the control method of the air conditioner when executed by the processor.