CN218154729U

CN218154729U - Air conditioning system

Info

Publication number: CN218154729U
Application number: CN202222221157.XU
Authority: CN
Inventors: 高文栋; 王庆杰; 司理涛
Original assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Current assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date: 2022-08-23
Filing date: 2022-08-23
Publication date: 2022-12-27
Anticipated expiration: 2032-08-23

Abstract

The application provides an air conditioning system, which comprises at least one indoor unit and an outdoor unit connected with the indoor unit, wherein the indoor unit comprises an adjusting device, and the adjusting device comprises an electronic expansion valve, a bypass pipe and a one-way valve; the bypass pipe is arranged on one side of an inlet pipe of the electronic expansion valve, the one-way valve is arranged on the bypass pipe, and an outlet of the one-way valve is close to the electronic expansion valve. The bypass pipe is introduced to adjust the gas pressure difference between the front and the back of the electronic expansion valve, the exciting force of the gaseous refrigerant on the valve needle in the electronic expansion valve is reduced after the pressure is reduced, the high-frequency noise radiated by the valve needle is reduced, namely, the flowing sound of the refrigerant, and the use experience of a user is improved.

Description

Air conditioning system

Technical Field

The application relates to the technical field of vibration and noise reduction of air conditioners, in particular to an air conditioner system, a control method for reducing flowing sound of a refrigerant and an adjusting device.

Background

With the improvement of living standard, air conditioning systems gradually enter thousands of households, and users pay attention to the comfort of the air conditioning systems in addition to the requirement that the air conditioning systems have good refrigerating and heating effects. Noise improvement is an important aspect of improving the comfort of air conditioning systems. The noise of the air conditioning system generally comprises wind noise and refrigerant flowing noise, and along with the continuous deepening of the silencing design of the air conditioning system, the wind noise of the air conditioning system becomes smaller and smaller, so that the refrigerant flowing noise becomes more and more obvious, and therefore, the problem of the refrigerant flowing noise is very important to solve.

Disclosure of Invention

The embodiment of the application provides an air conditioning system, which comprises at least one indoor unit and an outdoor unit connected with the indoor unit, wherein the indoor unit comprises an adjusting device, and the adjusting device comprises an electronic expansion valve, a bypass pipe and a one-way valve; the bypass pipe is arranged on one side of an inlet pipe of the electronic expansion valve, the one-way valve is arranged on the bypass pipe, and an outlet of the one-way valve is close to the electronic expansion valve.

The electronic expansion valve comprises a valve body, an inlet pipe, an outlet pipe and a valve needle, wherein one end of the by-pass pipe is connected to the valve body of the electronic expansion valve, and the other end of the by-pass pipe is connected to one side of the inlet pipe of the electronic expansion valve.

In the direction of refrigerant flow in the cooling mode, the check valve is in a closed state.

In the heating mode, the one-way valve is in an opening state,

the refrigerant flows from the inlet pipe to the outlet pipe of the electronic expansion valve, the valve needle is in the vertical direction, and partial gaseous refrigerant flows through the bypass pipe before the refrigerant flows to the electronic expansion valve.

The electronic expansion valve further comprises a coil and a rotor assembly, the rotor assembly is connected with the valve needle, the valve needle is used for adjusting the opening of the electronic expansion valve, the rotor assembly is used for driving the valve needle to move, and the coil surrounds the valve needle in the circumferential direction.

The air conditioning system further comprises a compressor, a four-way reversing valve, an outdoor unit heat exchanger, an outdoor fan, an outdoor unit electronic expansion valve, a liquid side stop valve, an indoor unit heat exchanger, an indoor fan, a gas side stop valve and a gas-liquid separator.

The compressor is arranged between the four-way reversing valve and the gas-liquid separator and provides power for the circulation of the refrigerant, one end of the outdoor heat exchanger is connected with the compressor through the four-way reversing valve, and the other end of the outdoor heat exchanger is connected with the indoor heat exchanger; the outdoor fan is connected with the outdoor fan and used for driving or changing the rotating speed of the outdoor fan.

The outdoor electronic expansion valve is arranged between the indoor heat exchanger and the outdoor heat exchanger, and has the function of expanding and decompressing the refrigerant flowing through the outdoor electronic expansion valve.

The liquid side stop valve is arranged between the electronic expansion valve of the outdoor unit and the electronic expansion valve in the adjusting device.

The air side stop valve is arranged between the compressor and the indoor unit heat exchanger.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

Fig. 1 is a schematic structural diagram of an air conditioning system according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a refrigerant system according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of an adjusting device according to an embodiment of the present application;

fig. 4 is a schematic flowchart of a control method of an adjusting device according to an embodiment of the present disclosure;

fig. 5 is a schematic flowchart of another control method for an adjusting device according to an embodiment of the present disclosure;

fig. 6 is a schematic flowchart of another control method for an adjusting device according to an embodiment of the present disclosure;

fig. 7 is a schematic flowchart of another control method for an adjustment device according to an embodiment of the present application;

FIG. 8 is a schematic flow chart of another control method for an adjustment device according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a control device of an adjusting device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.

Fig. 1 illustrates an air conditioning system according to an embodiment of the present application, where the air conditioning system may also be referred to as a "one-drive-many" air conditioner. Generally, an air conditioning system may include a multi-split outdoor unit and at least two multi-split indoor units, and the multi-split outdoor unit may be connected to two or more multi-split indoor units through a pipe. Since the air conditioning system includes a plurality of indoor units, it can be referred to as an air conditioning system. For convenience of description, in the embodiment of the present application, a multi-indoor unit may be referred to as an outdoor unit, and a multi-indoor unit may be referred to as an indoor unit.

The embodiment of the application does not specifically limit the temperature regulation forms of the indoor unit and the outdoor unit, and as a feasible implementation method, the multi-connected outdoor unit can regulate the temperature in an air cooling heat exchange form. For another example, as a feasible implementation manner, the multi-split indoor unit can adopt a direct evaporation heat exchange mode to adjust the temperature.

The air conditioning system is further described with reference to the specific figures. Referring to fig. 1, fig. 1 is a schematic structural diagram of an air conditioning system according to a possible embodiment.

As shown in fig. 1, the air conditioning system may include: the system comprises a compressor 1, a four-way reversing valve 2, an outdoor unit heat exchanger 3, an outdoor fan 4, an outdoor unit electronic Expansion Valve (EVO) 5, a liquid side stop valve 6, an indoor unit electronic Expansion Valve (EVI) 7-1, a check valve 7-2, a bypass pipe 7-3, an indoor unit heat exchanger 8, an indoor fan 9, an air side stop valve 10 and a gas-liquid separator 11. It should be understood that fig. 1 only shows some of the components of the air conditioning system, and that other components not shown may also be present in the air conditioning system.

It should be noted that fig. 1 only shows a case where the air conditioning system includes two indoor units, and in a practical application process, the embodiment of the present application does not specifically limit the number of indoor units included in the air conditioning system.

In the embodiment of the present application, the compressor 1 is disposed between the four-way reversing valve 2 and the gas-liquid separator 11, and is configured to compress a refrigerant, and input the compressed refrigerant into the circulation system through the four-way reversing valve 2, so as to provide power for circulation of the refrigerant.

The following describes the function of the compressor by taking the circulation of the refrigerant in the heating mode as an example: in the heating mode, the compressor 1 can deliver the compressed refrigerant to the indoor heat exchanger 8 through the four-way reversing valve 2.

Alternatively, the compressor 1 may be a variable capacity inverter compressor controlled based on the rotation speed of an inverter.

In the embodiment of the present application, four ports (C, D, S, E) of the four-way reversing valve 2 are respectively connected to an exhaust port (not shown) of the compressor 1, the outdoor heat exchanger 3, the gas-liquid separator 11, and indoor heat exchangers of the respective indoor units.

The four-way reversing valve 2 is used for realizing the interconversion between the cooling mode and the heating mode of the air conditioning system by changing the flow direction of the refrigerant in the system pipeline.

In the embodiment of the application, one end of the outdoor heat exchanger 3 is connected with the compressor 1 through the four-way reversing valve 2, and the other end of the outdoor heat exchanger is connected with the indoor heat exchanger. The outdoor heat exchanger 3 is used to exchange heat between the refrigerant flowing through the heat transfer tubes of the outdoor heat exchanger 3 and the outdoor air, thereby achieving the purpose of temperature adjustment.

In the embodiment of the present application, the outdoor fan 4 is connected to an outdoor fan (not shown) for driving or changing the rotation speed of the outdoor fan to promote heat exchange between the refrigerant flowing through the heat transfer pipe of the outdoor heat exchanger 3 and the outdoor air, thereby achieving the purpose of assisting temperature adjustment.

In the present embodiment, an outdoor electronic Expansion Valve (EVO) 5 and an indoor electronic Expansion Valve (EVI) 7-1 are disposed between the indoor heat exchanger 8 and the outdoor heat exchanger 3. The outdoor electronic Expansion Valve (EVO) 5 has a function of expanding and decompressing a refrigerant flowing through the outdoor electronic Expansion Valve (EVO) 5, and can be used to adjust a flow rate of the refrigerant in the pipe. In the same principle, the indoor unit electronic Expansion Valve (EVI) 7-1 has a function of expanding and decompressing the refrigerant flowing through the outdoor unit electronic Expansion Valve (EVO) 5, and can be used to adjust the flow rate of the refrigerant in the pipe.

In the embodiment of the present application, if the opening degree of the electronic expansion valves (the indoor unit electronic expansion valve 7-1 and the outdoor unit electronic expansion valve 5) is decreased, the flow path resistance of the refrigerant passing through the electronic expansion valves is increased. When the opening degree of the electronic expansion valve is increased, the flow path resistance of the refrigerant passing through the electronic expansion valve is decreased. In this way, even if the state of other components of the air conditioning system does not change, the flow rate of the refrigerant flowing into the indoor heat exchanger 8 or the outdoor heat exchanger 3 changes when the opening degree of the electronic expansion valve changes.

It should be noted that fig. 1 is only an exemplary application scenario showing that the air conditioning system includes one outdoor electronic Expansion Valve (EVO) 5 and two indoor electronic Expansion Valves (EVI) 7-1, and the application scenario is not limited, and the number of the outdoor electronic Expansion Valves (EVO) 5 and the number of the indoor electronic Expansion Valves (EVI) 7-1 may be set according to requirements during the actual application process, which is not limited by the applicant herein.

In the embodiment of the application, one end of the bypass pipe 7-3 is connected to the valve body of the electronic Expansion Valve (EVI) 7-1 of the indoor unit, and the other end of the bypass pipe is connected to one side of the inlet pipe of the electronic Expansion Valve (EVI) 7-1 of the indoor unit.

In the embodiment of the application, the one-way valve 7-2 is arranged on the bypass pipe 7-3, and the outlet of the one-way valve 7-2 is close to an electronic Expansion Valve (EVI) 7-1 of the indoor unit.

In the embodiment of the application, the liquid side stop valve 6 is arranged between an outdoor electronic Expansion Valve (EVO) 5 and an indoor electronic Expansion Valve (EVI) 7-1.

In the embodiment of the present application, the indoor heat exchanger 8 is configured to exchange heat between the refrigerant flowing through the heat transfer pipe of the indoor heat exchanger 8 and the indoor air.

In the present embodiment, the indoor fan 9 is connected to an indoor fan (not shown) for driving or changing the rotational speed of the indoor fan so as to promote heat exchange between the refrigerant flowing through the heat transfer pipe of the indoor heat exchanger 8 and the indoor air.

In the embodiment of the present application, the air-side shutoff valve 10 is disposed between the compressor assembly and the indoor unit heat exchanger 8.

In the embodiment of the present application, the gas-liquid separator 11 is connected to the compressor 1, and is configured to separate a gaseous refrigerant from a liquid refrigerant.

In some embodiments, the air conditioning system is also accompanied by a remote control having functionality to communicate with the controller, for example, using infrared or other communication means. The remote controller is used for various controls of the air conditioning system by a user, and interaction between the user and the air conditioning system is realized.

Optionally, the air conditioning system may further include a load adjusting valve, a temperature sensor, a pressure sensor, an outdoor throttling device, and the like, which are not described herein again.

Those skilled in the art will appreciate that the hardware configuration shown in FIG. 1 does not constitute a limitation of air conditioning systems, which may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components. The number of the indoor unit heat exchanger 8 and the indoor unit electronic Expansion Valve (EVI) 7-1 shown in fig. 1 is only an example, and the present application is not limited thereto.

Fig. 2 is a schematic diagram of a refrigerant system in an air conditioning system. Wherein, refrigerant system mainly includes four parts: the heat exchanger comprises a compressor 1, an indoor unit heat exchanger 8, an outdoor unit electronic Expansion Valve (EVO) 5, an indoor unit electronic Expansion Valve (EVI) 7-1 and an outdoor unit heat exchanger 3 which are connected into a closed system, so that a refrigerant circulates in the closed system, and the processes of absorbing and releasing heat are completed.

Specifically, when the air conditioning system is in the heating mode, the circulation process of the refrigerant system is as shown in fig. 2, where the direction indicated by the solid arrow is the flowing direction of the refrigerant in the heating mode. The compressor 1 compresses a refrigerant from the outdoor heat exchanger 3, and discharges the compressed refrigerant into the indoor heat exchanger 8. The refrigerant is condensed in the indoor heat exchanger 8, and heat is released in the condensation process of the refrigerant. And then, when the refrigerant passes through an indoor unit electronic Expansion Valve (EVI) 7-1, an outdoor unit electronic Expansion Valve (EVO) 5 and an outdoor unit heat exchanger 3 in sequence. Due to the throttling effect of the electronic expansion valve, the pressure in the outdoor heat exchanger 3 is lower than the pressure in the indoor heat exchanger 8. The refrigerant evaporates in the outdoor heat exchanger 3, and the refrigerant absorbs heat in the process of evaporating to complete the cycle process.

When the air conditioner is in a cooling mode, the flow direction of the refrigerant is opposite to the flow direction of the refrigerant in a heating state (the direction indicated by the dotted arrow is the flow direction of the refrigerant in the cooling mode), and the circulation process is completed.

The refrigerant flowing noise is easily generated in the heating mode, as shown in fig. 3, the refrigerant flows from the inlet pipe to the outlet pipe of the electronic expansion valve in the heating mode (the direction indicated by the solid arrow in fig. 3 is the flowing direction of the refrigerant in the heating mode), because the needle is in the vertical direction due to the internal structure of the electronic expansion valve, the refrigerant directly collides with the top of the needle of the electronic expansion valve when flowing into the electronic expansion valve from the inlet pipe, and the needle shakes to generate the refrigerant flowing noise. The refrigerant in the refrigeration mode flows in a reverse direction (the direction indicated by the dotted arrow in fig. 3 is the flow direction of the refrigerant in the refrigeration mode), the refrigerant flows from the outlet pipe to the inlet pipe of the electronic expansion valve, the refrigerant vertically acts on the side surface of the valve needle of the electronic expansion valve, the generated exciting force is small, and the valve needle is not easy to generate vibration.

Through analyzing the refrigerant flowing sound generated in the heating mode starting process, the refrigerant flowing sound generated in the heating mode starting process is obtained mainly because the valve needle in the electronic expansion valve is subjected to the exciting force of gaseous refrigerant, and the valve needle tremble can radiate high-frequency noise so as to generate the refrigerant flowing sound.

Therefore, how to change the exciting force applied to the valve needle inside the electronic expansion valve to effectively reduce the refrigerant flow noise becomes a problem to be solved urgently.

In order to reduce the flowing sound of the refrigerant in the heating mode, an embodiment of the present application further provides an adjusting device, which is applied to the air conditioning system shown in fig. 1, and the adjusting device is further described below with reference to specific drawings. Referring to fig. 3, fig. 3 is a schematic structural diagram of an adjusting device according to a possible embodiment.

As shown in fig. 3, the adjusting means may include: an electronic expansion valve (in the embodiment of the present application, the electronic expansion valve is an electronic expansion valve of an indoor unit unless otherwise specified), and a bypass pipe 34. The electronic expansion valve comprises a valve body 31, an inlet pipe 32, an outlet pipe 33 and a valve needle 36. It should be understood that fig. 3 only shows some components of the electronic expansion valve, and that other components not shown may also be present. For example, the electronic expansion valve further comprises a coil and a rotor assembly, wherein the rotor assembly is connected with the valve needle, the valve needle is used for adjusting the opening degree of the electronic expansion valve, the rotor assembly is used for driving the valve needle to move, and the coil surrounds the valve needle in the circumferential direction.

In the embodiment of the present application, one end of the bypass pipe 34 is connected to the electronic expansion valve body 31, and the other end is connected to the side of the electronic expansion valve inlet pipe 32.

Because the refrigerant flows from the inlet pipe to the outlet pipe of the electronic expansion valve in the heating mode (the direction indicated by the solid arrow in fig. 3 is the flow direction of the refrigerant in the heating mode), because the valve needle is in the vertical direction due to the internal structure of the electronic expansion valve, the refrigerant directly collides with the top of the valve needle of the electronic expansion valve when flowing into the electronic expansion valve from the inlet pipe, and the valve needle shakes to generate refrigerant flow noise. A bypass pipe 34 is provided in the inlet pipe 32 of the electronic expansion valve. In the heating mode, partial gaseous refrigerant flows through the bypass pipe before flowing to the electronic expansion valve, so that the vibration of the gaseous refrigerant to the valve needle of the electronic expansion valve is reduced, the vibration force applied to the valve needle is reduced, and the noise of the valve needle is reduced.

As a possible implementation, the regulating device further comprises a one-way valve 35 arranged in the line of the bypass pipe 34, the outlet of the one-way valve being adjacent to the electronic expansion valve.

Because the one-way valve is adopted in the embodiment, the one-way valve is in a closed state in the flowing direction of the refrigerant in the refrigeration mode, and therefore the operation of the air conditioning system cannot be influenced.

An embodiment of the present invention further provides a control method for reducing flowing noise of a refrigerant, which is applied to the air conditioning system shown in fig. 1, and as shown in fig. 4, the control method includes the following steps:

s401, responding to the mode control command, and reading the mode carried by the mode control command.

In some embodiments, when a user turns on the air conditioning system, the user triggers mode control commands, each mode control command uniquely corresponding to a mode. Wherein the mode may be, but is not limited to: cooling, heating, air supply, dehumidification modes and the like.

The implementation manner of the trigger mode control instruction can be that a user inputs the trigger mode control instruction through a remote controller or a control panel, and the remote controller or the control panel sends a starting instruction input by the user to a controller of the multi-connected air conditioner.

S402, if the mode is the heating mode, opening a one-way valve.

Because under the heating mode, the refrigerant flows from the inlet pipe to the outlet pipe of the electronic expansion valve, because of the internal structure of the electronic expansion valve, the valve needle is in the vertical direction, and the refrigerant can directly collide the top of the valve needle of the electronic expansion valve when flowing into the electronic expansion valve from the inlet pipe to cause vibration of the valve needle and further generate refrigerant flowing sound, the check valve is opened to reduce the refrigerant flowing sound under the condition that a user opens the heating mode.

As a possible implementation, as shown in fig. 5, the step of opening the check valve includes:

s501, acquiring the state of the indoor unit;

s502, if the indoor unit is in the closed state, the opening degree of the electronic expansion valve is set to the first opening degree EVI (n 1), and the check valve is opened.

In the embodiment of the present application, the first opening EVI (n 1) is preset by the system, and may be set according to requirements in the process of practical application, which is not limited in this embodiment.

In this implementation, the indoor unit fan and the heat exchanger that are not turned on are in the closed state, but the opening degree of the electronic expansion valve is also controlled to be generally a certain opening degree in consideration of the problem of the oil return reliability of the compressor. The oil return reliability refers to that when the refrigerant is discharged from the air outlet of the compressor, a part of lubricating oil can be taken away, the lubricating oil gradually deposits in the evaporator and the heat exchanger in a layered manner along with the circulation flow of the refrigerant, and the running of the lubricating oil brings inconvenience to the operation of the air conditioning system. The opening degree of the electronic expansion valve which is not started is set to be the first opening degree EVI (n 1) so as to ensure good operation of the air conditioning system.

As another possible implementation, as shown in fig. 6, the step of opening the check valve includes:

s601, when the indoor unit is in the operating state, the opening of the electronic expansion valve is set to the second opening EVI (n 2).

The second opening degree EVI (n 2) is preset by the system, and may be set according to requirements in the process of practical application, which is not limited in this embodiment of the present application. The second opening degree EVI (n 2) is greater than the first opening degree EVI (n 1), and the opening degree of the electronic expansion valve needs to be increased because the refrigerant flow rate of the indoor unit that is not started is small, and the refrigerant flow rate of the indoor unit that is started is large.

And S602, after the first set time, opening the one-way valve.

The first setting time is preset by the system, and can be set according to requirements in the process of practical application, which is not limited in this application.

In the implementation mode, the started indoor unit fan and the heat exchanger are in the opening state, so that heat exchange between the refrigerant flowing in the heat transfer pipe and outdoor air is realized, and the purpose of auxiliary temperature regulation is achieved. Therefore, when the started indoor unit is started in the heating mode, the gas phase occupation ratio of the refrigerant in the system is relatively low, and large impact cannot be generated on a valve needle of the electronic expansion valve, so that the one-way valve does not need to be opened in advance to wait for the first set time, and the one-way valve is opened while the compressor is started.

As a possible implementation manner, the air conditioning system further includes a compressor, as shown in fig. 7, and the control method further includes the following steps:

and S701, starting the compressor after the first set time, and reading the frequency of the compressor.

And S702, if the frequency of the compressor is equal to the set frequency, closing the one-way valve.

The pressure and temperature of each part of the system are unstable in the starting process of the air conditioning system, and the refrigerant flowing sound is easily generated at the outlet of the electronic expansion valve, so that the electronic expansion valve is started to balance the pressure and temperature before and after the electronic expansion valve is started, and after the electronic expansion valve is waited for a first set time, the compressor is started again, so that the gas-state and liquid-state mixed refrigerant can be prevented from generating large impact on a valve needle of the electronic expansion valve, and the refrigerant flowing sound is further reduced. If the frequency of the compressor is equal to the set frequency, the pressure and the temperature of all parts of the system are stable, the flowing sound of the refrigerant is not easy to generate, and the one-way valve can be closed.

In some embodiments, if the mode is other mode, as shown in fig. 8, the control method further includes the steps of:

s801, the electronic expansion valve opening degree is set at the second opening degree EVI (n 2).

The other modes are modes different from the heating mode, such as a cooling mode, an air supply mode, a dehumidification mode, and the like, and the embodiments of the present application are not limited in any way.

Because the refrigerant flows from the outlet pipe to the inlet pipe of the electronic expansion valve or does not flow in other modes, the refrigerant flowing sound is not easy to generate, and the opening of the electronic expansion valve is controlled to be a certain opening to balance the pressure and the temperature of the system under the condition that a user opens other modes.

And S802, starting the compressor after the air conditioning system passes the second set time.

And in other modes, the electronic expansion valve is started first to balance the pressure and the temperature before and after the electronic expansion valve, and the compressor is started after waiting for the second set time. The gaseous refrigerant can be prevented from generating large impact on the valve needle of the electronic expansion valve, and the generation of refrigerant flowing sound is further avoided. The second setting time may be preset by the system, and in the process of practical application, may be equal to the first setting time, and is specifically set according to requirements, and the embodiment of the present application does not limit this.

The embodiment of the present application further provides an air conditioning system, and air conditioning system includes at least two indoor sets, and the off-premises station of being connected with the indoor set, and the indoor set includes adjusting device and the controller of being connected with adjusting device, and adjusting device includes: an electronic expansion valve, a bypass pipe and a one-way valve; the bypass pipe is arranged at one side of an inlet pipe of the electronic expansion valve, the one-way valve is arranged on the bypass pipe, and an outlet of the one-way valve is close to the electronic expansion valve; the controller is configured to execute the control method provided by the embodiment of the application.

Referring to fig. 9, an embodiment of the present invention further provides a control device for reducing flowing noise of a refrigerant, including: the reading module is used for reading the mode carried by the mode control instruction and the state of the indoor unit and is also used for reading the frequency of the compressor; and the control module is used for adjusting the opening degree of the electronic expansion valve to a target opening degree, opening and closing the one-way valve and starting the compressor.

As a possible implementation manner, the control device comprises a reading module and a control module, wherein the reading module is used for reading the state of the indoor unit, and if the indoor unit is in a closed state; the control module is used for opening the one-way valve and setting the opening degree of the electronic expansion valve at a first opening degree.

As a possible implementation manner, if the indoor unit is in the working state, setting the opening of the electronic expansion valve at a second opening, wherein the second opening is larger than the first opening; after the first set time, the check valve is opened.

As a possible implementation, the control module is further configured to: and starting the compressor after the first set time.

As a possible implementation, the reading module is further configured to read a frequency of the compressor; if the frequency of the compressor is equal to the set frequency, the check valve is closed.

As a possible implementation, if the mode is the other mode, the other mode is a mode different from the heating mode; the electronic expansion valve opening degree is set at the second opening degree.

As a possible implementation, after the step of setting the opening degree of the electronic expansion valve at the second opening degree, the compressor is started after a second set time.

The above is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An air conditioning system is characterized by comprising at least one indoor unit and an outdoor unit connected with the indoor unit, wherein the indoor unit comprises an adjusting device which comprises an electronic expansion valve, a bypass pipe and a one-way valve; the bypass pipe is arranged on one side of an inlet pipe of the electronic expansion valve, the one-way valve is arranged on the bypass pipe, and an outlet of the one-way valve is close to the electronic expansion valve.

2. The air conditioning system as claimed in claim 1, wherein the electronic expansion valve comprises a valve body, an inlet pipe, an outlet pipe, and a valve needle, and the bypass pipe has one end connected to the valve body of the electronic expansion valve and the other end connected to the inlet pipe side of the electronic expansion valve.

3. The air conditioning system as claimed in claim 2, wherein the check valve is in a closed state in a direction in which the refrigerant flows in the cooling mode.

4. The air conditioning system of claim 2, wherein in the heating mode, the check valve is in an open state,

the refrigerant flows from an inlet pipe to an outlet pipe of the electronic expansion valve, the valve needle is in the vertical direction, and part of gaseous refrigerant flows through the bypass pipe before the refrigerant flows to the electronic expansion valve.

5. The air conditioning system of claim 2, wherein the electronic expansion valve further comprises a coil and a rotor assembly, the rotor assembly is connected with the valve needle, the valve needle is used for adjusting the opening degree of the electronic expansion valve, the rotor assembly is used for driving the valve needle to move, and the coil surrounds the circumference of the valve needle.

6. The air conditioning system of claim 1, further comprising a compressor, a four-way reversing valve, an outdoor heat exchanger, an outdoor fan, an outdoor electronic expansion valve, a liquid side stop valve, an indoor heat exchanger, an indoor fan, a gas side stop valve, and a gas-liquid separator.

7. The air conditioning system of claim 6, wherein the compressor is disposed between the four-way reversing valve and the gas-liquid separator to provide power for the circulation of the refrigerant, and one end of the outdoor heat exchanger is connected to the compressor through the four-way reversing valve, and the other end is connected to the indoor heat exchanger; the outdoor fan is connected with the outdoor fan and used for driving or changing the rotating speed of the outdoor fan.

8. The air conditioning system of claim 6, wherein the outdoor electronic expansion valve is disposed between the indoor heat exchanger and the outdoor heat exchanger, and the outdoor electronic expansion valve is capable of expanding and decompressing the refrigerant flowing through the outdoor electronic expansion valve.

9. The air conditioning system as claimed in claim 6, wherein the liquid side stop valve is disposed between the electronic expansion valve of the outdoor unit and the electronic expansion valve of the conditioner.

10. The air conditioning system of claim 6, wherein the air side shutoff valve is disposed between the compressor and the indoor unit heat exchanger.