WO2024040915A1 - Air conditioner - Google Patents

Abstract

An air conditioner (1000), comprising: an outdoor machine (100), at least one indoor machine (200), electronic expansion valves (300), and a controller (91). The outdoor machine (100) comprises a compressor (110), an outdoor heat exchanger (120), and an indoor heat exchanger (210), wherein the compressor (110) compresses a refrigerant to drive the refrigerant to circulate in the air conditioner (1000); the outdoor heat exchanger (120) performs one of liquefaction and vaporization on the refrigerant; the at least one indoor machine (200) is connected to the outdoor machine (100); each indoor machine (200) comprises an indoor heat exchanger (210); and the indoor heat exchanger (210) performs the other of liquefaction and vaporization on the refrigerant. The electronic expansion valves (300) are connected to both the indoor heat exchangers (210) and the outdoor heat exchanger (120), and are used for adjusting the flow of the refrigerant circulating between the outdoor heat exchanger (120) and the indoor heat exchangers (210). The controller (91) is configured to read a temperature difference, determine degrees of undercooling of the electronic expansion valves (300) according to the temperature difference, calculate the difference between the degrees of undercooling, determine target opening degrees of the electronic expansion valves (300) according to the difference between the degrees of undercooling, and adjust the opening degrees of the electronic expansion valves (300) to the target opening degrees.

Description

air conditioner

This application claims the priority of the Chinese patent application with application number 202211008849.4 submitted on August 22, 2022; the priority of the Chinese patent application with application number 202211015066.9 submitted on August 23, 2022; in 2022 The priority of the Chinese patent application with application number 202222221157.X submitted on August 23, the entire content of which is incorporated into this application by reference.

Technical field

The present disclosure relates to the technical field of household appliances, and in particular to an air conditioner.

Background technique

With the improvement of living standards, multi-split air conditioning systems have gradually entered thousands of households. In addition to requiring multi-split air conditioning systems to have good cooling and heating effects, users are also concerned about the comfort of multi-split air conditioning systems. Noise improvement is an important aspect to improve the comfort of multi-split air conditioning systems.

The multi-split air conditioning system includes an outdoor unit and multiple indoor units. The outdoor unit and multiple indoor units are equipped with electronic expansion valves for regulating the flow of refrigerant in the pipelines.

Contents of the invention

On the one hand, an air conditioner is provided. The air conditioner includes: an outdoor unit, at least one indoor unit, an electronic expansion valve and a controller. The outdoor unit includes: a compressor, an outdoor heat exchanger and an indoor heat exchanger. The compressor is configured to compress the refrigerant to drive the refrigerant to circulate in the air conditioner; the outdoor heat exchanger is configured to liquefy or vaporize the refrigerant; the at least one indoor The indoor unit is connected to the outdoor unit, and each indoor unit includes an indoor heat exchanger. The indoor heat exchanger is configured to liquefy or vaporize the refrigerant. The electronic expansion valve is connected to the indoor heat exchanger and the outdoor heat exchanger respectively, and is configured to regulate the flow of refrigerant flowing between the outdoor heat exchanger and the indoor heat exchanger. The controller is configured to: read the temperature difference, which is the difference between the temperature of the middle part of the indoor heat exchanger and the outlet temperature; and determine the temperature of the electronic expansion valve according to the temperature difference. Degree of subcooling; calculate the difference in subcooling, which is the difference between the degree of subcooling and the set value of subcooling; determine the electronic expansion valve according to the difference in subcooling the target opening; adjust the opening of the electronic expansion valve to the target opening to reduce the proportion of gas-phase refrigerant and reduce the refrigerant flow noise.

In another aspect, an air conditioner is provided. The air conditioner includes an outdoor unit, at least one indoor unit, an electronic expansion valve, a regulating device and a controller. The outdoor unit includes a compressor, an outdoor heat exchanger and an indoor heat exchanger; the compressor is configured to compress refrigerant to drive the refrigerant to circulate in the air conditioner. The outdoor heat exchanger is configured to one of liquefy or vaporize the refrigerant. The at least one indoor unit is connected to the outdoor unit, and each indoor unit includes an indoor heat exchanger configured to one of liquefy or vaporize the refrigerant. The electronic expansion valve is connected to the indoor heat exchanger and the outdoor heat exchanger, and is configured to regulate the flow of refrigerant flowing between the outdoor heat exchanger and the indoor heat exchanger. The regulating device is connected to the electronic expansion valve and is configured to reduce the impact of the gas phase refrigerant on the electronic expansion valve to reduce refrigerant flow noise. The regulating device includes a bypass pipe and a one-way valve. The bypass pipe is arranged on one side of the inlet pipe of the electronic expansion valve, and the first end of the bypass pipe is connected to the inlet pipe, and the second end of the bypass pipe is connected to the electronic expansion valve. Valve body connection. The one-way valve is provided on the bypass pipe, and the one-way valve is configured to provide one-way communication in the direction from the inlet pipe to the valve body through the bypass pipe. The controller is configured to respond to the mode control instruction, read the operating mode carried by the mode control instruction, and open the one-way valve if the operating mode is the heating mode.

Description of drawings

In order to explain the technical solutions in the present disclosure more clearly, the drawings required to be used in some embodiments of the present disclosure will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of the present disclosure.

Figure 1 is a structural diagram of an air conditioner according to some embodiments;

Figure 2 is a structural diagram of another air conditioner according to some embodiments;

Figure 3 is a flow chart of a control method for reducing refrigerant flow noise of an indoor electronic expansion valve according to some embodiments;

Figure 4 is a structural diagram of an indoor heat exchanger according to some embodiments;

Figure 5 is a refrigerant pressure-enthalpy diagram according to some embodiments;

Figure 6 is a flow chart of an indoor electronic expansion valve control method according to some embodiments;

Figure 7 is a flow chart of another indoor electronic expansion valve control method according to some embodiments;

Figure 8 is a flow chart of yet another indoor electronic expansion valve control method according to some embodiments;

Figure 9 is a structural block diagram of an indoor electronic expansion valve control device according to some embodiments;

Figure 10 is a structural diagram of yet another air conditioner according to some embodiments;

Figure 11 is a structural diagram of a refrigerant system according to some embodiments;

Figure 12 is a structural diagram of an adjustment device according to some embodiments;

Figure 13 is a flow chart of a control method of an adjustment device according to some embodiments;

Figure 14 is a flow chart of another control method of an adjustment device according to some embodiments;

Figure 15 is a flow chart of yet another control method of an adjustment device according to some embodiments;

Figure 16 is a flow chart of yet another control method of an adjustment device according to some embodiments;

Figure 17 is a structural diagram of a controller according to some embodiments.

Picture description:
1000-air conditioner;
100-outdoor unit; 110-compressor; 111-exhaust port; 120-outdoor heat exchanger;
200-Indoor unit; 210-Indoor heat exchanger;
300-expansion valve; 310-outdoor electronic expansion valve; 320-indoor electronic expansion valve; 32-inlet pipe; 33-outlet pipe; 34-
Bypass pipe; 35-one-way valve; 36-valve needle;
400-Four-way directional valve; C-first port; D-second port; S-third port; E-fourth port;
500-stop valve; 501-liquid side stop valve; 502-gas side stop valve;
600-fan; 601-outdoor fan; 602-indoor fan;
700-Gas-liquid separator;
20-temperature sensor; 21-first temperature sensor; 22-second temperature sensor;
91-controller; 92-memory; 93-processor; 94-communication interface.

Detailed ways

The technical solutions in some embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments provided by this disclosure, all other embodiments obtained by those of ordinary skill in the art fall within the scope of protection of this disclosure.

Unless the context otherwise requires, throughout the specification and claims, the term "comprise" and its other forms such as the third person singular "comprises" and the present participle "comprising" are used. Interpreted as open and inclusive, it means "including, but not limited to." In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific "example" or "some examples" and the like are intended to indicate that a particular feature, structure, material or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be included in any suitable manner in any one or more embodiments or examples.

In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. or an implicit indication of the quantity of the technical feature indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

In describing some embodiments, expressions "coupled" and "connected" and their derivatives are used. For example, some embodiments may be described using the term "connected" to indicate that two or more components are in direct physical or electrical contact with each other. As another example, the term "coupled" may be used when describing some embodiments to indicate that two or more components are in direct physical or electrical contact. However, the terms "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited by the content herein.

"At least one of A, B and C" has the same meaning as "at least one of A, B or C" and includes the following combinations of A, B and C: A only, B only, C only, A and B The combination of A and C, the combination of B and C, and the combination of A, B and C.

"A and/or B" includes the following three combinations: A only, B only, and a combination of A and B.

The use of "suitable for" or "configured to" in this document implies open and inclusive language that does not exclude devices that are suitable for or configured to perform additional tasks or steps.

Additionally, the use of "based on" is meant to be open and inclusive in that a process, step, calculation or other action "based on" one or more stated conditions or values may in practice be based on additional conditions or beyond the stated values.

As used herein, "about," "approximately," or "approximately" includes the stated value as well as an average within an acceptable range of deviations from the particular value, as determined by one of ordinary skill in the art. Determined taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system).

Figure 1 is a structural diagram of an air conditioner according to some embodiments, and Figure 2 is another structural diagram of an air conditioner according to some embodiments. As shown in Figures 1 and 2, some embodiments of the present disclosure provide an air conditioner. 1000. The air conditioner 1000 includes a compressor 110, an outdoor heat exchanger 120, an indoor heat exchanger 210, an expansion valve 300, a four-way reversing valve 400, a stop valve 500, a fan 600 and a gas-liquid separator 700.

In some embodiments of the present disclosure, the air conditioner 1000 includes four operating modes, which are heating mode, cooling mode, dehumidification mode and air supply mode. The heating mode indicates that the air conditioner 1000 heats the indoor environment, and the cooling mode indicates that the air conditioner 1000 cools the indoor environment. The dehumidification mode means that the air conditioner 1000 dehumidifies the indoor ambient temperature. The air supply mode means that the air conditioner 1000 increases indoor air flow and has no obvious cooling or heating effect on the indoor environment. It should be noted that in some embodiments, the air conditioner 1000 may also include other operating modes, such as a cooling and dehumidification mode, which is not limited by the present disclosure.

Air conditioner 1000 includes an outdoor unit 100 and an indoor unit 200 . The outdoor unit 100 of the air conditioner 1000 includes a compressor 110 and an outdoor heat exchanger 120 , and the indoor unit 200 of the air conditioner 1000 includes an indoor heat exchanger 210 . The air conditioner 1000 further includes an expansion valve 300, and at least one of the outdoor unit 100 or the indoor unit 200 is provided with the expansion valve 300.

The compressor 110, the condenser (indoor heat exchanger 210 or outdoor heat exchanger 120), the expansion valve 300, and the evaporator (outdoor heat exchanger 120 or indoor heat exchanger 210) execute the refrigerant cycle of the air conditioner 1000. The refrigerant cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the regulated side cycle.

The indoor heat exchanger 210 is configured to one of liquefy or vaporize the refrigerant by exchanging heat between the indoor air and the refrigerant transported in the indoor heat exchanger 210 . The outdoor heat exchanger 120 is configured to one of liquefy or vaporize the refrigerant by exchanging heat with outdoor air and the refrigerant transported in the outdoor heat exchanger 120 . For example, the indoor heat exchanger 210 works as an evaporator when the air conditioner 1000 operates in the cooling mode, so that the refrigerant that has been dissipated through the outdoor heat exchanger 120 absorbs heat from the indoor air through the indoor heat exchanger 210 and evaporates. The indoor heat exchanger 210 works as a condenser in the heating mode of the air conditioner 1000, so that the refrigerant that has absorbed heat through the outdoor heat exchanger 210 dissipates heat to the indoor air through the indoor heat exchanger 210 to be condensed.

The expansion valve 300 may be an electronic valve connected between the outdoor heat exchanger 120 and the indoor heat exchanger 210 . The expansion valve 300 includes an outdoor electronic expansion valve (outdoor machine electronic expansion valve, EVO) 310 and an indoor electronic expansion valve (indoor machine electronic expansion valve, EVI) 320. The opening of the electronic expansion valve 300 adjusts the pressure of the refrigerant flowing through the outdoor heat exchanger 120 and the indoor heat exchanger 210 to adjust the pressure of the refrigerant flowing through the outdoor heat exchanger 120 and the indoor heat exchanger. refrigerant flow between heaters 210. The flow rate and pressure of the refrigerant flowing between the outdoor heat exchanger 120 and the indoor heat exchanger 210 will affect the heat exchange performance of the outdoor heat exchanger 120 and the indoor heat exchanger 210 .

It should be noted that the opening of the electronic expansion valve 300 is adjustable to control the flow rate and pressure of the refrigerant flowing through the electronic expansion valve 300 . For example, when the opening degree of the electronic expansion valve 300 is reduced, the flow path resistance of the refrigerant passing through the electronic expansion valve 300 increases; when the opening degree of the electronic expansion valve 300 is increased, the flow path resistance of the refrigerant passing through the electronic expansion valve 300 is increased. decrease. In this way, even if the status of other components of the air conditioner 1000 does not change, when the opening of the electronic expansion valve 300 changes, the refrigerant flow rate flowing to the indoor heat exchanger 210 or the outdoor heat exchanger 120 will also change.

The compressor 110 compresses the gas-phase refrigerant in a low-temperature and low-pressure state and discharges the compressed high-temperature and high-pressure gas-phase refrigerant. The high-temperature and high-pressure gas phase refrigerant flows into the condenser. The condenser condenses the high-temperature and high-pressure gas phase refrigerant into a high-pressure liquid phase refrigerant, and the heat is released to the surrounding environment along with the condensation process. The expansion valve 300 expands a high-pressure liquid refrigerant into a low-pressure gas-liquid two-phase refrigerant. The evaporator absorbs heat from the surrounding environment and evaporates the low-pressure gas-liquid two-phase refrigerant to form a low-temperature and low-pressure gas-phase refrigerant. The low-temperature and low-pressure gas phase refrigerant returns to the compressor 110 .

As shown in Figure 1, in some embodiments of the present disclosure, the evaporation temperature of the outdoor heat exchanger 210 is Te, the exhaust pressure of the compressor 110 is Pd, the exhaust temperature is Td, the suction pressure is Ps, and the suction temperature for Ts.

For example, the compressor 110 may be a variable capacity compressor with inverter-based speed control.

The four-way reversing valve 400 includes four ports, which are a first port C, a second port D, a third port S, and a fourth port E. The first port C is connected to the outdoor heat exchanger 120 and the second port. D is connected to the exhaust port 111 of the compressor 110, the third port S is connected to the gas-liquid separator 700, and the fourth port E is connected to the indoor heat exchanger 210. The four-way reversing valve 400 realizes mutual conversion of the air conditioner 1000 between the cooling mode and the heating mode by changing the flow direction of the refrigerant in the system pipeline.

The stop valve 500 includes a liquid side stop valve 501 and a gas side stop valve 502 . The liquid side stop valve 501 is provided between the outdoor electronic expansion valve 310 and the indoor unit electronic expansion valve 320, and is configured to control the flow rate of the liquid phase refrigerant that has been condensed by the condenser and circulates in the pipeline. The gas-side stop valve 502 is provided between the compressor 110 and the indoor heat exchanger 210, and is configured to control the flow rate of the gas-phase refrigerant that has been evaporated by the evaporator and circulates in the pipeline.

The fan 600 includes an outdoor fan 601 and an indoor fan 602. The outdoor fan 601 is configured to promote heat exchange between the refrigerant flowing in the heat transfer tube of the outdoor heat exchanger 120 and the outdoor air, and the indoor fan 602 is configured to promote the heat exchange between the refrigerant flowing in the heat transfer tube of the indoor heat exchanger 210 and the indoor air. Heat exchange of air to assist in temperature regulation.

The gas-liquid separator 700 is configured to filter the liquid phase refrigerant that has not been completely evaporated in the gas phase refrigerant returned to the compressor 110 .

As shown in FIG. 2 , in some embodiments of the present disclosure, the air conditioner 1000 further includes a controller 91 . The controller 91 is coupled to the compressor 110 , the four-way valve 400 , the outdoor fan 601 and the outdoor electronic expansion valve 310 in the outdoor unit 100 , and is coupled to the indoor fan 602 and the indoor electronic expansion valve 320 in the indoor unit 200 . The controller 91 is configured to control the working status of each component coupled to the controller 91 .

Controller 91 includes a processor. The processor may include a central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), and may be configured such that when the processor executes storage coupled to the controller 91 When the program in the non-transitory computer-readable medium is read, the corresponding operations described in the controller 91 are performed.

The multi-split air conditioner 1000 includes one outdoor unit 100 and at least one indoor unit 200. For convenience of description, some embodiments of the present disclosure mainly take the example that the air conditioner 1000 includes one outdoor unit 100 and two indoor units 200.

It should be noted that FIG. 1 shows an application scenario in which the air conditioner 1000 includes one outdoor unit electronic expansion valve 310 and two indoor electronic expansion valves 320. The number of the outdoor unit electronic expansion valve 310 and the indoor electronic expansion valve 320 can be set according to requirements. , this disclosure does not limit this.

In some embodiments, the outdoor unit 100 can use air-cooling heat exchange to adjust the temperature, and the indoor unit 200 can use evaporative heat exchange to adjust the temperature. This disclosure does not limit the temperature adjustment form of the outdoor unit 100 or the indoor unit 200 .

In some embodiments, the air conditioner 1000 further includes a remote control having a function of communicating with the controller 91 using, for example, infrared rays. The user can control the air conditioner 1000 through the remote control to realize interaction between the user and the air conditioner 1000.

Affected by the complex operating environment, the refrigerant may be in a gas-liquid two-phase state when flowing through the electronic expansion valve 300. The gas-liquid two-phase refrigerant refers to a mixture of gas-phase refrigerant and liquid-phase refrigerant. Since the electronic expansion valve 300 is a throttling and pressure reducing component, when the gas-liquid two-phase When the refrigerant flows through the electronic expansion valve 300, the cross-sectional area through which the refrigerant passes suddenly becomes smaller. The liquid phase refrigerant in the gas-liquid two-phase refrigerant passes through the expansion part of the electronic expansion valve 300 and becomes a gas phase refrigerant. When it flows through the electronic expansion valve 300 When the proportion of gas-phase refrigerant in the refrigerant is about 30% to 70%, larger bubbles will be generated in the gas-phase refrigerant, and the larger bubbles will spread and burst, resulting in the sound of refrigerant flowing. It should be noted that the refrigerant flow sound is usually easily produced in the heating mode.

In the related art, the opening of the electronic expansion valve 300 is usually adjusted based on experience or according to the power of the compressor 110 . However, due to the complex operating environment of the air conditioner, adjusting the opening of the electronic expansion valve 300 based on experience cannot cope with frequent mode changes. When the indoor unit 200 performs frequent mode changes, the refrigerant flowing through the electronic expansion valve 300 will Intermittent refrigerant flow sound is produced. The sound of refrigerant flow is mostly high-frequency noise or intermittent noise, and users are very sensitive to high-frequency and intermittent noise.

In order to solve the above technical problems, some embodiments of the present disclosure provide a control method for the indoor electronic expansion valve 320 . By controlling the proportion of gas phase refrigerant in the refrigerant flowing through the electronic expansion valve 300 to be lower than 30% or higher than 70%, the refrigerant flow noise is reduced.

Figure 3 is a flow chart of a control method for reducing refrigerant flow noise of an indoor electronic expansion valve according to some embodiments, and Figure 4 is a structural diagram of an indoor heat exchanger according to some embodiments.

As shown in FIG. 3 , the control method is applied to the controller 91 and includes steps S101 to S105.

Step S101: Read the temperature difference X between the temperature at the middle part of the indoor unit heat exchanger 210 and the outlet temperature.

The temperature difference X is, for example, X=TC-TL, where TC is the temperature in the middle of the indoor unit heat exchanger 210, and TL is the outlet temperature.

It should be noted that the middle part of the indoor heat exchanger 210 is a position close to the center of the indoor heat exchanger 210. There may be gas-phase refrigerant, liquid-phase refrigerant or gas-liquid two-phase refrigerant in the middle part of the indoor heat exchanger 210. Any kind.

In some embodiments, as shown in FIG. 4 , the indoor heat exchanger 210 includes an outlet pipe 211 and an inlet pipe 212 . The air conditioner 1000 also includes a plurality of temperature sensors 20, such as a first temperature sensor 21 and a second temperature sensor 22. The first temperature sensor 21 is disposed near the center of the indoor heat exchanger 210 and is configured to collect data from the indoor heat exchanger. The temperature of the middle part is 210 TC. The second temperature sensor 22 is provided at the outlet pipe 211 of the indoor heat exchanger 210 and is configured to collect the outlet temperature TL.

Step S102, determine the subcooling degree of the indoor electronic expansion valve 320 according to the temperature difference value X.

It should be noted that the degree of under cooling (SC) refers to the difference between the temperature of the refrigerant under a certain pressure and the corresponding saturation temperature when the temperature of the refrigerant under a certain pressure is lower than the saturation temperature under the corresponding pressure.

Figure 5 is a refrigerant pressure-enthalpy diagram according to some embodiments. As shown in Figure 5, the ordinate of the pressure-enthalpy diagram is the pressure P, the unit is Pa (Pa), the abscissa is the specific enthalpy value H, and the specific enthalpy value H refers to 1kg Enthalpy value of a certain substance, unit (kj/kg). The degree of subcooling SC can be expressed as the temperature T6 of the high-pressure saturated liquid of the refrigerant (the corresponding temperature when the refrigerant is in the state corresponding to the coordinate point ⑥ in Figure 5) and the condenser outlet temperature T2 (when the refrigerant is in the state corresponding to the coordinate point ② in Figure 5 The difference between corresponding temperatures): SC=T6-T2. Among them, the refrigerant high-pressure saturated liquid can be a liquid-phase refrigerant or a gas-liquid two-phase refrigerant.

In some embodiments, when the air conditioner 1000 is running in the heating mode, the temperature TC in the middle of the indoor heat exchanger 210 is used as the temperature T6 of the refrigerant high-pressure saturated liquid, and the detection at the outlet pipe 211 of the indoor heat exchanger 210 is selected. The temperature TL is taken as the condenser outlet temperature T2. At this time, the subcooling degree of the indoor electronic expansion valve 320 can be expressed as: SC=TC-TL.

Step S103: Calculate the subcooling degree difference ΔSC.

The subcooling degree difference ΔSC is the difference between the subcooling degree SC and the subcooling degree set value SC _set . For example, ΔSC=SC-SC _set .

In some embodiments, the subcooling degree set value SC _set is preset by the system and can be set according to needs. The subcooling degree set value SC _set satisfies: 0℃<SC _set <20℃, for example, SC _set (1℃～5℃). It can be 1℃, 5℃, 10℃ or 15℃, etc.

Step S104, determine the target opening EVI (N+1) of the indoor electronic expansion valve 320 based on the subcooling degree difference ΔSC.

In some embodiments, as shown in FIG. 17 , the controller 91 of the air conditioner 1000 also includes a memory 92 , and the corresponding relationship between the subcooling degree difference ΔSC and the opening of the indoor electronic expansion valve 320 can be stored in the memory 92 in advance. . After the controller 91 completes the calculation of the subcooling degree difference ΔSC, the controller 91 retrieves the target opening EVI (N+1) according to the corresponding relationship between the stored subcooling degree difference ΔSC and the opening of the indoor electronic expansion valve 300 ).

Step S105, adjust the indoor electronic expansion valve 320 to the target opening EVI(N+1).

The controller 91 adjusts the opening of the indoor electronic expansion valve 320 according to the retrieved target opening EVI(N+1), thereby The indoor electronic expansion valve 320 is adjusted to the target opening EVI (N+1). When the indoor electronic expansion valve 320 is at the target opening, the proportion of gas-phase refrigerant in the indoor electronic expansion valve 320 can basically reach less than 30% or more than 70%. , In this way, it is helpful to control the proportion of gas phase refrigerant, thereby reducing the refrigerant flow noise.

FIG. 6 is a flow chart of an indoor electronic expansion valve control method according to some embodiments, and FIG. 7 is a flow chart of another indoor electronic expansion valve control method according to some embodiments. In some embodiments, as shown in Figures 6 and 7, before step S101, the controller 91 also needs to perform step S100.

Step S100: Read the status of the indoor unit 200.

In some embodiments, the indoor unit 200 includes an operating state and a non-operating state. The operating state of the indoor unit 200 refers to the state when the indoor unit 200 is turned on and running, and the non-operating state of the indoor unit 200 refers to the shutdown state or standby state of the indoor unit 200 .

In some embodiments, in response to the user initiating the operation of the air conditioner 1000, the controller 91 may adjust the opening of the indoor electronic expansion valve 320 to the initial value. EVI02 is an initial value corresponding to the opening of the indoor electronic expansion valve 320 when the indoor unit 200 is in operation. When EVI(N)=EVI02, it is determined that the indoor unit 200 is in the running state at this time. EVI0 is an initial value corresponding to the opening of the indoor electronic expansion valve 320 when the indoor unit 200 is in a non-operating state. When EVI(N)=EVI0, it is determined that the indoor unit 200 is in the non-operation state at this time.

It should be noted that EVI(N) is the current opening of the indoor electronic expansion valve 320 . EVI0 and EVI02 can be set according to needs. For example, EVI0 and EVI02 can be set according to the capacity of the air conditioner 1000 or the number of indoor units 200. Generally, the values of EVI0 and EVI02 are positive to the capacity of the air conditioner 1000 or the number of indoor units 200. Related.

As shown in FIG. 6 , when the controller 91 determines that the indoor unit 200 is in the operating state, step S104 includes steps S200 to S204.

Step S200, determine EVI(N)=EVI02.

Step S201: Determine whether the subcooling degree difference ΔSC is less than or equal to the first subcooling degree value G1. If yes, step S202 is executed. If not, step S203 is executed.

The first subcooling value G1 can be set according to requirements. For example, G1 can be 3°C, 5°C, or 6°C.

When the controller 91 determines that the subcooling degree difference ΔSC is greater than the first subcooling degree value G1, it determines that the current opening EVI(N) of the indoor electronic expansion valve 320 is smaller than the target opening EVI(N+1). For example, EVI(N+1)=EVI(N)+ΔEVI.

Here, EVI(N+1) is the target opening of the indoor electronic expansion valve 320, and ΔEVI is the opening variation of the indoor electronic expansion valve 320, which can be set according to requirements, and is not limited in this disclosure.

Step S202: Determine whether the subcooling degree difference ΔSC is greater than zero. If yes, step S2021 is executed. If not, step S2022 is executed.

In order to take into account the temperature regulation efficiency of the air conditioner 1000, the controller 91 needs to determine whether the subcooling difference ΔSC is greater than zero.

When the controller 91 determines that the subcooling degree difference ΔSC is greater than zero, it determines that the current opening EVI(N) of the indoor electronic expansion valve 320 is equal to the target opening EVI(N+1). For example, EVI(N+1)=EVI(N).

When the controller 91 determines that the subcooling degree difference ΔSC is less than zero, it determines that the current opening EVI(N) of the indoor electronic expansion valve 320 is greater than the target opening EVI(N+1). For example, EVI(N+1)=EVI(N)-ΔEVI.

Step S2021: Keep the opening of the indoor electronic expansion valve 320 unchanged.

At this time, the controller 91 ensures the temperature-regulating efficiency of the air conditioner 1000 by keeping the opening of the indoor electronic expansion valve 320 constant.

Step S2022, reduce the opening of the indoor electronic expansion valve 320.

At this time, the controller 91 reduces the opening of the indoor electronic expansion valve 320 to reduce the refrigerant flow sound.

Step S203: Increase the opening of the indoor electronic expansion valve 320.

At this time, the controller 91 reduces the refrigerant flow noise by increasing the opening of the indoor electronic expansion valve 320 .

It should be noted that after the controller 91 controls the opening of the indoor electronic expansion valve 320 to be adjusted and makes the indoor electronic expansion valve 320 operate stably according to the adjusted target opening EVI (N+1), the controller 91 executes step S204 .

Step S204: End this adjustment process.

As shown in FIG. 7 , when the controller 91 determines that the state of the indoor unit 200 is a non-operating state, for example, a shutdown state or a standby state, step S104 may include steps S300 to S304.

Step S300, determine EVI(N)=EVI0.

Step S301: Determine whether the subcooling degree difference ΔSC is less than or equal to the second subcooling degree value G2. If yes, step S302 is executed. If not, step S303 is executed.

The second subcooling value G2 can be set according to requirements. For example, G2 can be 5°C, 6°C or 10°C. When the controller 91 determines that the subcooling degree difference ΔSC is less than or equal to the second subcooling degree value G2, it determines that the current opening EVI(N) of the indoor electronic expansion valve 320 is greater than the target opening EVI(N+1). For example, EVI(N+1)=EVI(N)-ΔEVI.

When the controller 91 determines that the subcooling degree difference ΔSC is greater than the second subcooling degree value G2, it determines that the current opening EVI(N) of the indoor electronic expansion valve 320 is equal to the target opening EVI(N+1). For example, EVI(N+1)=EVI(N).

It should be noted that, in some embodiments, when the indoor unit 200 is in the non-operating state, the indoor fan 602 is turned off and the indoor heat exchanger 210 cannot perform effective heat exchange. Therefore, when the indoor unit 200 is in the non-operating state, the corresponding second The subcooling degree value G2 is greater than the corresponding first subcooling degree value G1 when the indoor unit 200 is in the operating state.

Step S302, reduce the opening of the indoor electronic expansion valve 320.

At this time, the controller 91 reduces the opening of the indoor electronic expansion valve 320 to reduce the refrigerant flow sound.

Step S303: Keep the opening of the indoor electronic expansion valve 320 unchanged.

At this time, the controller 91 ensures the temperature-regulating efficiency of the air conditioner 1000 by keeping the opening of the indoor electronic expansion valve 320 constant.

After the opening of the indoor electronic expansion valve 320 is adjusted by the controller 91 and operates stably according to the adjusted target opening EVI(N+1), step S304 is executed.

Step S304: End this adjustment process.

In some embodiments of the present disclosure, the controller 91 can re-read the temperature difference X every predetermined time interval T (such as 20 s), and adjust the opening of the indoor electronic expansion valve 320 in time according to the temperature difference X. In this way, refrigerant flow sound caused by refrigerant with a small degree of subcooling flowing through the indoor electronic expansion valve 320 can be avoided.

It should be noted that the shorter the predetermined time T, the more significant the effect of the air conditioner 1000 in reducing the refrigerant flow sound. However, a shorter predetermined time T will increase the calculation amount of the controller 91 accordingly.

Figure 8 is a flow chart of yet another indoor electronic expansion valve control method according to some embodiments. As shown in Figure 8, when the operating mode of the indoor unit 200 changes, the frequency of the compressor 110 needs to be adjusted. The frequency of the compressor 110 changes, and the refrigerant pressure in the system of the air conditioner 1000 changes accordingly, resulting in a degree of subcooling. SC changes, thereby affecting the opening of the indoor unit electronic expansion valve 320. Therefore, when receiving the instruction to adjust the frequency of the compressor 110, the controller 91 executes steps S400 to S404.

Step S400: A frequency adjustment instruction from the compressor 21 is received.

Step S401: Compare whether the current operating frequency Ft of the compressor 110 is less than the target frequency Fn. If yes, execute step S402; if not, execute step S403.

When the current frequency Ft of the compressor 110 is less than the target frequency Fn, it means that the frequency of the compressor 110 needs to be increased to reach the target frequency Fn.

On the contrary, when the current frequency Ft of the compressor 110 is greater than the target frequency Fn, it means that the compressor 110 needs to reduce the frequency to reach the target frequency Fn.

Step S402: Increase the opening of the indoor electronic expansion valve 320 to the target opening EVI(N+1).

For example, EVI(N+1)=EVI(N)+ΔEVI.

Step S4021, increase the frequency of the compressor 110 to the target frequency Fn.

Step S403, reduce the compressor frequency to the target frequency Fn.

For example, EVI(N+1)=EVI(N)-ΔEVI.

Step S4031, reduce the opening of the indoor electronic expansion valve 320 to the target opening.

In this way, it can be avoided that when the frequency of the compressor 110 changes, the refrigerant will generate a strong compression wave at the indoor electronic expansion valve 320, causing the indoor unit 200 to generate noise.

Step S404: End this adjustment process.

Figure 9 is a structural block diagram of an indoor electronic expansion valve control device according to some embodiments. As shown in Figure 9, in some embodiments, the controller 91 includes: a reading component 81 configured to read the temperature difference, or configured to pressure The compressor operating frequency is the target frequency, and the temperature difference is the difference between the temperature at the middle part of the indoor unit heat exchanger and the outlet temperature; the retrieval component 82 is used to retrieve the subcooling of the indoor electronic expansion valve 320 corresponding to the temperature difference. degree; the calculation component 83 is used to calculate the subcooling degree difference, which is the difference between the subcooling degree and the subcooling degree set value; the determination component 84 is used to determine the indoor electronic expansion based on the subcooling degree difference. The target opening of the valve 320; the adjustment component 85 adjusts the opening of the indoor electronic expansion valve 320 to the target opening.

FIG. 10 is a structural diagram of another air conditioner according to some embodiments, FIG. 11 is a structural diagram of a refrigerant system according to some embodiments, and FIG. 12 is a structural diagram of an adjustment device according to some embodiments.

As shown in Figures 11 and 12, when the air conditioner 1000 is running in the heating mode, the refrigerant flows from the inlet pipe 32 of the indoor electronic expansion valve 320 to the outlet pipe 33 (the direction pointed by the solid arrow in Figure 12), because the indoor electronic expansion valve Due to the internal structure of the 320, the valve needle 36 is in a vertical direction. When the refrigerant flows from the inlet pipe 32 into the indoor electronic expansion valve 320, it will directly hit the top of the valve needle 36. The valve needle 36 is subject to the excitation force of the gas phase refrigerant, causing the valve needle 36 to tremble. And it radiates high-frequency noise, causing the valve needle 36 to vibrate and produce refrigerant flow sound. In the refrigeration mode, the refrigerant flows in the opposite direction (the direction pointed by the dotted arrow in Figure 12). The refrigerant flows from the outlet pipe 33 of the indoor electronic expansion valve 320 to the inlet pipe 32. At this time, the refrigerant acts vertically on the side of the valve needle 36, causing The excitation force is small, and it is difficult for the valve needle 36 to vibrate and thereby produce refrigerant flow sound. Therefore, refrigerant flow noise is usually easily produced in heating mode.

In order to change the excitation force experienced by the valve needle 36 of the indoor electronic expansion valve 320 and effectively reduce the refrigerant flow noise, as shown in Figure 10, in some embodiments, the air conditioner 1000 further includes an adjustment device 30, and the adjustment device 30 is configured In the heating mode, the impact of the gas-phase refrigerant on the valve needle 36 is reduced, and the excitation force on the valve needle 36 is reduced, thereby reducing the noise of the valve needle 36 .

As shown in FIGS. 10 and 12 , the indoor electronic expansion valve 320 includes a valve body 31 , an inlet pipe 32 , an outlet pipe 33 and a valve needle 36 . The inlet pipe 32 is connected to the indoor heat exchanger 210 , the outlet pipe 33 is connected to the outdoor heat exchanger 120 , and the valve needle 36 is arranged in the valve body 31 . The regulating device 30 includes a bypass pipe 34. The first end 341 of the bypass pipe 34 is connected to the inlet pipe 32 of the indoor electronic expansion valve 320. The second end 342 of the bypass pipe 34 is connected to the valve body 31 of the indoor electronic expansion valve 320. .

When the air conditioner 1000 is operating in the heating mode, the refrigerant flows into the valve body 31 from the inlet pipe 32 of the indoor electronic expansion valve 320 and flows out from the outlet pipe 33, causing the valve needle 36 to vibrate and generate refrigerant flow sound. In the air conditioner 1000 in some embodiments of the present disclosure, the bypass pipe 34 of the regulating device 30 is provided. When the refrigerant flows through the indoor electronic expansion valve 320, part of the gas phase refrigerant flows into the valve body 31 through the bypass pipe 34, so that there is It is beneficial to reduce the excitation of the valve needle 36 by the gas phase refrigerant and reduce the excitation force on the valve needle 36, thereby reducing the noise of the valve needle 36.

In some embodiments of the present disclosure, as shown in FIG. 12 , the regulating device 30 further includes a one-way valve 35 , which is disposed on the bypass pipe 34 and is configured to pass from the inlet pipe 32 through the bypass pipe 34 There is one-way communication in the direction to the valve body 31 .

When the air conditioner 1000 is operating in the heating mode, the one-way valve 35 is in an open state, so that the gas phase refrigerant can be diverted through the bypass pipe 34 to reduce the noise of the valve needle 36 . When the air conditioner 1000 operates in the cooling mode, the one-way valve 35 is in a closed state in the direction of refrigerant flow, so that the air conditioner 1000 can operate normally.

Some embodiments of the present disclosure also provide a control method for reducing refrigerant flow noise, which can be applied to the air conditioner 1000 shown in FIG. 10 . Figure 13 is a flow chart of a control method of an adjustment device according to some embodiments. As shown in Figure 13, the control method is applied to the controller 91 and includes steps S10 to S11.

Step S10: Respond to the mode control instruction and read the operating mode carried by the mode control instruction.

In some embodiments, when the user turns on the air conditioner 1000, the user triggers a mode control instruction, and each mode control instruction corresponds to an operating mode. Operation modes include cooling mode, heating mode, air supply mode or dehumidification mode, etc. The trigger mode control instruction may be implemented by the user inputting through a remote control or control panel, and the remote control or control panel sends the start instruction input by the user to the controller 91 of the air conditioner 1000 .

Step S11, when it is read that the operating mode carried by the mode control instruction is the heating mode, the one-way valve 35 is opened.

The gas phase refrigerant can be diverted through the bypass pipe 34 to reduce the noise of the valve needle 36 . In this way, when the user turns on the heating mode, the one-way valve 35 is opened to reduce the refrigerant flow sound.

FIG. 14 is a flow chart of another control method of an adjustment device according to some embodiments. In some embodiments, as shown in FIG. 14 , step S11 may include steps S20 to S24.

Step S20: Obtain the operating status of the indoor unit 200.

Step S21, determine the operating status of the indoor unit 200. When the indoor unit 200 is in a non-operating state, execute step S22. When the indoor unit 200 is in the running state, steps S23 to S24 are executed.

In step S22, the opening of the indoor electronic expansion valve 320 is set to the first opening EVI(n1), and the one-way valve 35 is opened.

In some embodiments, when the indoor unit 200 is in a non-operating state, the indoor fan 602 and the indoor heat exchanger 210 are in a closed state. However, considering the reliability of the oil return of the compressor 110, the indoor electronic expansion valve 320 also needs to be controlled. The opening is the first opening EVI(n1).

It should be noted that the oil return reliability refers to when the high-temperature and high-pressure gas-phase refrigerant compressed by the compressor 110 is discharged from the exhaust port 111. Due to the fast flow rate and high temperature of the gas-phase refrigerant when it is discharged, part of the compressor oil (i.e. The lubricating oil used in the compressor) forms oil vapor and oil droplets due to the high temperature, and is discharged together with the gas phase refrigerant. The compressor oil circulates with the refrigerant and is deposited in layers in the evaporator and condenser. The compressor oil The loss will affect the operation of the air conditioner 1000. In some embodiments of the present disclosure, the opening of the indoor electronic expansion valve 320 that is not turned on is set to the first opening EVI(n1) to ensure good operation of the air conditioner 1000.

In step S23, the opening of the indoor electronic expansion valve 320 is set to the second opening EVI(n2).

It should be noted that the first opening EVI(n1) and the second opening EVI(n2) are preset by the system, and can be set according to requirements during actual application, and this disclosure does not limit this.

It should be noted that the second opening degree EVI(n2) is greater than the first opening degree EVI(n1). Since the refrigerant flow rate flowing in the system is small when the indoor unit 200 is in the non-operating state, the refrigerant flow rate in the system is smaller when the indoor unit 200 is in the operating state. The refrigerant flow rate is large, so when the indoor unit 200 transitions from the non-operating state to the operating state, the opening of the indoor electronic expansion valve 320 needs to be increased to meet the refrigerant flow demand in the system.

Step S24: After the indoor unit 200 is in the operating state and has passed the first set time T _set1 , the one-way valve 35 is opened.

In some embodiments, when the indoor unit 200 is in the running state, the indoor fan 602 and the indoor heat exchanger 210 are turned on, so that the refrigerant flowing in the heat transfer tube of the indoor heat exchanger 210 exchanges heat with the indoor air to assist the temperature. adjust. Therefore, when the indoor unit 200 is in the heating mode, the proportion of gas-phase refrigerant in the system is relatively small and will not have a large impact on the valve needle 36 of the indoor electronic expansion valve 320. Therefore, there is no need to open it in advance. The one-way valve 35 just needs to wait for the first set time T _set1 , and then open the one-way valve 35 while the compressor 110 is starting.

Figure 15 is a flow chart of yet another control method of an adjustment device according to some embodiments. In some embodiments, as shown in Figure 15, the control method is applied to the controller 91 and also includes steps S31 to S32.

Step S31: After the indoor unit 200 turns on the operating state for the first set time T _set1 , the compressor 110 is started, and the operating frequency of the compressor 110 is read.

Step S32, if it is determined that the operating frequency of the compressor 110 is equal to the set frequency, the one-way valve 35 is closed.

It should be noted that since the pressure and temperature throughout the system are unstable during the startup process of the air conditioner 1000, it is easy for the indoor electronic expansion valve 320 to produce refrigerant flow sound, so the indoor electronic expansion valve 320 is first opened to balance the inlet of the indoor electronic expansion valve 320. The pressure and temperature at the pipe 32 and the outlet pipe 33 are waited for the first set time T _set1 before starting the compressor 110, which can prevent the gas-liquid two-phase refrigerant from causing a large impact on the valve needle 36 of the indoor electronic expansion valve 320. impact, thereby reducing the refrigerant flow sound. When the operating frequency of the compressor 110 is equal to the set frequency, the pressure and temperature throughout the system tend to be stable, and refrigerant flow noise is less likely to occur, so the one-way valve 35 can be closed.

Figure 16 is a flow chart of yet another control method of an adjustment device according to some embodiments. In some embodiments, as shown in Figure 16, the control method is applied to the controller 91 and also includes steps S41 to S42.

In step S41, when the read operating mode is another mode, the opening of the indoor electronic expansion valve 320 is set to the second opening EVI(n2).

In some embodiments, other modes are modes different from the heating mode, such as cooling mode, etc., which is not limited by the present disclosure.

Since the indoor electronic expansion valve 320 is not likely to produce refrigerant flow noise in other modes, it is only necessary to control the opening of the indoor electronic expansion valve 320 at a corresponding opening to balance the system pressure and temperature.

Step S42: after the second set time T _set2 has passed, the compressor 110 is started.

In other modes, the indoor electronic expansion valve 320 is first opened to balance the pressure and temperature at the inlet pipe 32 and the outlet pipe 33 of the indoor electronic expansion valve 320, and then the compressor 110 is started after waiting for the second set time T _set2 . In this way, the gas phase refrigerant can be prevented from having a large impact on the valve needle 36 of the indoor electronic expansion valve 320, thereby avoiding the generation of refrigerant flow noise.

It should be noted that the first set time T _set1 and the second set time T _set2 are preset by the system. In the process of actual application, the second set time T _set2 is set according to needs and can be equal to the first preset time. Assume time T1, which is not limited in this disclosure.

In some embodiments, the reading component 81 of the controller 91 is further configured to read the mode carried by the mode control instruction and the operating status of the indoor unit 200 . The adjustment assembly 85 is also configured to adjust the opening of the indoor electronic expansion valve 320 .

In other embodiments, the reading component 81 of the controller 91 is further configured to read the operating frequency of the compressor 110 . The adjustment assembly 85 is also configured to adjust the operating frequency of the compressor 110 .

Figure 17 is a structural diagram of a controller according to some embodiments. As shown in Figure 17, in addition to a memory 92, the controller 91 also includes a processor 93, a communication interface 94 and a communication line 95.

In some embodiments, the controller 91 refers to a device that can generate an operation control signal according to the instruction operation code and the timing signal to instruct the air conditioner 1000 to execute the control instruction. For example, the controller 91 can be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller , programmable logic device (PLD) or any combination thereof. The controller 91 may also be other devices with processing functions, such as circuits, devices or software modules, which is not limited in this disclosure.

In addition, the controller 91 can be used to control the operation of various components inside the air conditioner 1000, so that the various components of the air conditioner 1000 operate to achieve various predetermined functions of the air conditioner 1000.

It should be noted that FIG. 17 only illustrates a scenario in which the controller 91 includes one processor. The above scenario does not constitute a limitation. During actual application, the number of processors can be set according to requirements.

In some embodiments, the memory 92 , the processor 93 and the communication interface 94 are connected by a communication line 95 . The memory 92 is used to store computer program codes and data. The computer program codes include instructions and are used by the processor 93 to execute the instructions stored in the memory 92. The communication interface 94 is used to connect with other external devices to receive input content, thereby realizing the present invention. Controller 91 in some embodiments is disclosed.

The memory 92 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (Random Access Memory, RAM) or other type that can store information and instructions. A dynamic storage device can also be an electrically erasable programmable read only memory (EEPROM), a compact disc (Compact Disc Read Only Memory, CD ROM) or other optical disc storage, optical disc storage (including compressed Optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), magnetic disk storage medium or other magnetic storage device, or can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer Any other medium, without limitation. The memory 92 may exist independently and be connected to the processor 93 through a bus. The memory 92 may also be integrated with the processor 93.

The processor 93 may be a general central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present invention. circuit.

The communication interface 94 may be connected to components of the air conditioner 1000 such as the adjustment device 30, the temperature sensor, and the compressor 110 to send signals to or receive signals from the components of the air conditioner 1000.

In some embodiments of the present disclosure, the present disclosure also provides a computer program product including one or more instructions, which can be executed by the controller 91 of the air conditioner 1000 to complete the control in the above embodiments. method.

Those skilled in the art will understand that the disclosed scope of the present invention is not limited to the specific embodiments described above, and certain elements of the embodiments may be modified and replaced without departing from the spirit of the disclosure. The scope of the disclosure is limited by the appended claims.

Claims (18)

1. An air conditioner, including:

   Outdoor unit, including:

   a compressor configured to compress refrigerant to drive the refrigerant to circulate in the air conditioner;

   An outdoor heat exchanger configured to either liquefy or vaporize the refrigerant;

   At least one indoor unit is connected to the outdoor unit, and each indoor unit includes:

   an indoor heat exchanger configured to liquefy or vaporize the refrigerant;

   An electronic expansion valve, respectively connected to the indoor heat exchanger and the outdoor heat exchanger, and configured to regulate the refrigerant flow flowing between the outdoor heat exchanger and the indoor heat exchanger; and

   Controller, configured as:

   Read the temperature difference, which is the difference between the temperature of the middle part of the indoor heat exchanger and the outlet temperature;

   Determine the degree of subcooling of the electronic expansion valve according to the temperature difference;

   Calculate the subcooling degree difference, which is the difference between the subcooling degree and the subcooling degree set value;

   Determine the target opening of the electronic expansion valve according to the subcooling degree difference;

   The opening of the electronic expansion valve is adjusted to the target opening to reduce the proportion of gas phase refrigerant and reduce the refrigerant flow noise.
2. The air conditioner according to claim 1, wherein,

   Before reading the temperature difference, the controller is further configured to:

   Read the status of the indoor unit;

   If the status of the indoor unit is running;

   Determining the target opening of the electronic expansion valve based on the subcooling difference includes:

   If the subcooling degree difference is greater than the first subcooling degree value, the current opening of the electronic expansion valve is less than the target opening of the electronic expansion valve;

   If the subcooling degree difference is between zero and the first subcooling degree value, then the current opening of the electronic expansion valve is equal to the target opening of the electronic expansion valve;

   If the subcooling degree difference is less than zero, the current opening of the electronic expansion valve is greater than the target opening of the electronic expansion valve.
3. The air conditioner according to claim 2, wherein

   If it is determined that the target opening of the electronic expansion valve is greater than the current opening of the electronic expansion valve, increase the opening of the electronic expansion valve;

   If it is determined that the current opening of the electronic expansion valve is equal to the target opening of the electronic expansion valve, then the opening of the electronic expansion valve is kept unchanged;

   If it is determined that the current opening of the electronic expansion valve is greater than the target opening of the electronic expansion valve, the opening of the electronic expansion valve is reduced.
4. The air conditioner according to claim 2, wherein the controller is further configured to:

   If the status of the indoor unit is non-operating:

   Determining the target opening of the electronic expansion valve based on the subcooling degree difference further includes:

   If the subcooling degree difference is less than or equal to the second subcooling degree value, the current opening of the electronic expansion valve is greater than the target opening of the electronic expansion valve;

   If the subcooling degree difference is greater than the second subcooling degree value, the current opening of the electronic expansion valve is equal to the target opening of the electronic expansion valve.
5. The air conditioner according to claim 4, wherein

   If it is determined that the current opening of the electronic expansion valve is greater than the target opening of the electronic expansion valve, reduce the opening of the electronic expansion valve;

   If it is determined that the current opening of the electronic expansion valve is equal to the target opening of the electronic expansion valve, the opening of the electronic expansion valve is kept unchanged.
6. The air conditioner according to claim 4, wherein the second subcooling degree value is greater than the first subcooling degree value.
7. The air conditioner according to any one of claims 2 to 6, wherein the controller is further configured to:

   At predetermined intervals, the temperature difference is read.
8. The air conditioner according to claim 7, wherein the controller is further configured to:

   In response to starting the air conditioner, the opening of the electronic expansion valve is adjusted to an initial value; the initial value is related to the capacity of the air conditioner and the number and status of the indoor units.
9. The air conditioner according to claim 7, wherein the controller is further configured to:

   In response to the instruction for compressor frequency adjustment, read the compressor operating frequency and the target frequency carried by the instruction;

   If the operating frequency of the compressor is less than the target frequency, first increase the opening of the electronic expansion valve, and then increase the frequency of the compressor.
10. The air conditioner according to claim 9, wherein the controller is further configured to:

    If the operating frequency of the compressor is greater than the target frequency, first reduce the frequency of the compressor, and then reduce the opening of the electronic expansion valve.
11. An air conditioner, including:

    Outdoor unit, including:

    a compressor configured to compress refrigerant to drive the refrigerant to circulate in the air conditioner;

    An outdoor heat exchanger configured to either liquefy or vaporize the refrigerant;

    At least one indoor unit is connected to the outdoor unit, and each indoor unit includes:

    an indoor heat exchanger configured to liquefy or vaporize the refrigerant;

    An electronic expansion valve, connected to the indoor heat exchanger and the outdoor heat exchanger, and configured to regulate the refrigerant flow flowing between the outdoor heat exchanger and the indoor heat exchanger;

    a regulating device connected to the electronic expansion valve and configured to reduce the impact of gas-phase refrigerant on the electronic expansion valve. To reduce the sound of refrigerant flow, the adjustment device includes:

    A bypass pipe is provided on one side of the inlet pipe of the electronic expansion valve, and the first end of the bypass pipe is connected to the inlet pipe, and the second end of the bypass pipe is connected to the electronic expansion valve. valve body connection;

    A one-way valve provided on the bypass pipe, and the one-way valve is configured to conduct one-way communication in the direction from the inlet pipe to the valve body through the bypass pipe; and

    Controller, configured as:

    Respond to the mode control instruction and read the operating mode carried by the mode control instruction;

    If the operating mode is the heating mode, open the one-way valve.
12. The air conditioner according to claim 11, wherein opening the one-way valve includes:

    Read the status of the indoor unit;

    If it is determined that the indoor unit is in a non-operating state, the opening of the electronic expansion valve is set to the first opening and the one-way valve is opened.
13. The air conditioner according to claim 12, wherein opening the one-way valve further includes:

    If it is determined that the indoor unit is in a running state, the opening of the electronic expansion valve is set to a second opening, and the second opening is greater than the first opening;

    After the first set time, the one-way valve is opened.
14. The air conditioner according to claim 13, wherein after reading the indoor unit status, the controller is further configured to:

    After the first set time, the compressor is started.
15. The air conditioner according to claim 14, wherein after starting the compressor, the controller is further configured to:

    Read the frequency of said compressor;

    When the frequency of the compressor is equal to the set frequency, the one-way valve is closed.
16. The air conditioner according to claim 15, wherein the controller is further configured to:

    When the operating mode is another mode, the opening of the electronic expansion valve is set to the second opening; wherein,

    The other modes are modes different from the heating mode.
17. The air conditioner according to claim 16, wherein, after setting the opening of the electronic expansion valve at the second opening, the controller is further configured to:

    After the second set time, the compressor is started.
18. The air conditioner according to any one of claims 11 to 17, wherein the inlet pipe is connected to the valve body and the indoor heat exchanger respectively; the electronic expansion valve further includes:

    Outlet pipes are respectively connected with the valve body and the outdoor heat exchanger;

    The valve needle is arranged in the valve body.