Air conditioner control method and device, air conditioner system and storage medium

Abstract

The application relates to an air conditioner control method and device, an air conditioner system and a storage medium. The method comprises the following steps: acquiring an outdoor environment temperature and an air conditioner operation parameter of an air conditioner system, wherein the air conditioner system comprises a multifunctional vapor-liquid separator, an evaporator, a condenser, an electronic expansion valve, a four-way valve and a compressor; determining a target operation mode according to the outdoor environment temperature and the air conditioner operation parameter; when the target operation mode is a preset heat exchange mode, controlling the multifunctional vapor-liquid separator to perform heat exchange treatment on first refrigerant provided by the evaporator and second refrigerant provided by the condenser, the temperature of the first refrigerant being lower than that of the second refrigerant, and performing heat exchange between the low-temperature first refrigerant and the medium-temperature second refrigerant, so that the supercooling degree of the air conditioner system can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and in particular to an air conditioner control method and device, an air conditioner system, and a storage medium. BACKGROUND

[0002] Generally, when an air conditioner is running, the condensing side flows out medium-temperature high-pressure liquid refrigerant, and the evaporating side flows out low-temperature low-pressure gaseous refrigerant. There is a large heat exchange temperature difference between the two kinds of refrigerants. At present, there is no good method in the industry to exchange heat between the two kinds of refrigerants with large temperature differences, and the supercooling degree of the air conditioner system cannot be further improved. SUMMARY

[0003] The present application provides an air conditioner control method and device, an air conditioner system, and a storage medium to solve the problem that the existing air conditioner system cannot exchange heat between the condensing side flowing out medium-temperature high-pressure liquid refrigerant and the evaporating side flowing out low-temperature low-pressure gaseous refrigerant.

[0004] In a first aspect, the present application provides an air conditioner control method, characterized in that the method comprises:

[0005] obtaining an outdoor environment temperature and air conditioner operating parameters of an air conditioner system, wherein the air conditioner system comprises a multifunctional vapor-liquid separator, an evaporator, a condenser, an electronic expansion valve, a four-way valve, and a compressor;

[0006] determining a target operating mode according to the outdoor environment temperature and the air conditioner operating parameters;

[0007] when the target operating mode is a preset heat exchange mode, controlling the multifunctional vapor-liquid separator to perform heat exchange treatment on first refrigerant provided by the evaporator and second refrigerant provided by the condenser, wherein the temperature of the first refrigerant is lower than the temperature of the second refrigerant.

[0008] In a second aspect, the present application provides an air conditioner control device, characterized in that the device comprises:

[0009] an obtaining module configured to obtain an outdoor environment temperature and air conditioner operating parameters;

[0010] a determining module configured to determine a target operating mode according to the outdoor environment temperature and the air conditioner operating parameters;

[0011] a control module configured to, when the target operating mode is a preset heat exchange mode, control the multifunctional vapor-liquid separator to perform heat exchange treatment on first refrigerant provided by the evaporator and second refrigerant provided by the condenser, wherein the temperature of the first refrigerant is lower than the temperature of the second refrigerant.

[0012] In a third aspect, the present application provides an air conditioner system, comprising:

[0013] The indoor unit heat exchanger is configured to serve as an evaporator in cooling mode to provide a first refrigerant to the multifunctional vapor-liquid separator, and as a condenser in heating mode to provide a second refrigerant to the multifunctional vapor-liquid separator, wherein the temperature of the first refrigerant is lower than that of the second refrigerant;

[0014] an outdoor unit heat exchanger, configured to serve as a condenser in cooling mode to provide the second refrigerant to the multifunctional vapor-liquid separator, and to serve as an evaporator in heating mode to provide the first refrigerant to the multifunctional vapor-liquid separator;

[0015] The multifunctional vapor-liquid separator is respectively connected to the indoor unit heat exchanger indoor unit electronic expansion valve, the outdoor unit heat exchanger outdoor unit electronic expansion valve, the four-way valve, and the compressor, and is used to perform heat exchange processing on the first refrigerant provided by the evaporator and the second refrigerant provided by the condenser, and transfer the gaseous refrigerant after heat exchange to the compressor;

[0016] The compressor is connected to the indoor heat exchanger and the outdoor heat exchanger respectively through a four-way valve, and is used to perform different compression processes on the gaseous refrigerant in cooling mode or heating mode to release corresponding cooling capacity or heating capacity, thereby realizing cooling or heating of the air conditioner.

[0017] an indoor unit electronic expansion valve, connected to the indoor unit heat exchanger and the multifunctional vapor-liquid separator, respectively, for throttling and reducing the pressure of the second refrigerant into a liquid first refrigerant in a cooling mode, so that the liquid first refrigerant enters the indoor unit heat exchanger and evaporates into a gaseous first refrigerant;

[0018] an outdoor unit electronic expansion valve, connected to the outdoor unit heat exchanger and the multifunctional vapor-liquid separator, respectively, for throttling and reducing the pressure of the second refrigerant into a liquid first refrigerant in a heating mode, so that the liquid first refrigerant enters the outdoor unit heat exchanger and evaporates into a gaseous first refrigerant vapor-liquid separator;

[0019] In a fourth aspect, the present application further provides a computer storage medium storing computer executable instructions, wherein the computer executable instructions are used to execute the above-mentioned air conditioning control method.

[0020] The above-mentioned technical solution provided by the embodiment of the present application has the following advantages over the prior art: the method provided by the embodiment of the present application obtains the outdoor ambient temperature and the air-conditioning operating parameters of the air-conditioning system, wherein the air-conditioning system includes a multifunctional vapor-liquid separator, an evaporator and a condenser, an electronic expansion valve, a four-way valve, and a compressor; the target operating mode is determined according to the outdoor ambient temperature and the air-conditioning operating parameters; when the target operating mode is a preset heat exchange mode, the multifunctional vapor-liquid separator is controlled to perform heat exchange processing on the first refrigerant provided by the evaporator and the second refrigerant provided by the condenser, the temperature of the first refrigerant is lower than the temperature of the second refrigerant, and the low-temperature first refrigerant is heat exchanged with the medium-temperature second refrigerant, thereby improving the supercooling degree of the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0024] Figure 1 is a structural diagram of an air conditioning system in one embodiment;

[0025] Figure 2 is a schematic structural diagram of an air conditioning system in one embodiment;

[0026] Figure 3 is a schematic structural diagram of an air conditioning system in one embodiment;

[0027] Figure 4 is a structural diagram of an air conditioning system in one embodiment;

[0028] Figure 5 is a schematic structural diagram of an air conditioning system in one embodiment;

[0029] Figure 6 is a schematic structural diagram of an air conditioning system in one embodiment;

[0030] Figure 71 is a flow chart of an air conditioning control method according to an embodiment;

[0031] Figure 8 is a schematic diagram of a refrigerant cycle corresponding to a first cooling mode in an embodiment;

[0032] Figure 9 is a schematic diagram of a refrigerant cycle corresponding to the second cooling mode in one embodiment;

[0033] Figure 10 is a schematic diagram of a refrigerant cycle corresponding to the third cooling mode in one embodiment;

[0034] Figure 11 is a schematic diagram of a refrigerant cycle corresponding to a first heating mode in an embodiment;

[0035] Figure 12 is a schematic diagram of a refrigerant cycle corresponding to the second heating mode in one embodiment;

[0036] Figure 13 is a schematic diagram of a refrigerant cycle corresponding to the third heating mode in one embodiment;

[0037] Figure 14 2. It is a flow chart of an air conditioning control method in cooling mode according to an embodiment;

[0038] Figure 15 Schematic diagram of a flow chart of an air conditioning control method in heating mode in one embodiment;

[0039] Figure 16 A structural block diagram of an air conditioning control device provided in an embodiment of the present application;

[0040] Figure 17 A schematic diagram of the internal structure of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] The disclosure below provides many different embodiments or examples for implementing different configurations of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0043] Figure 1 FIG is a schematic diagram of the structure of an air conditioning system in one embodiment. Figure 1 , the air conditioning system includes:

[0044] The indoor unit heat exchanger 11 is used to serve as an evaporator in cooling mode to provide a first refrigerant to the multifunctional vapor-liquid separator 13, and to serve as a condenser in heating mode to provide a second refrigerant to the multifunctional vapor-liquid separator 13, wherein the temperature of the first refrigerant is lower than that of the second refrigerant;

[0045] The outdoor unit heat exchanger 12 is configured to serve as a condenser in cooling mode to provide the second refrigerant to the multifunctional vapor-liquid separator 13 , and to serve as an evaporator in heating mode to provide the first refrigerant to the multifunctional vapor-liquid separator 13 ;

[0046] The multifunctional vapor-liquid separator 13 is connected to the indoor unit heat exchanger 11 through the indoor unit electronic expansion valve 24, and to the outdoor unit heat exchanger 12 through the outdoor unit electronic expansion valve 22, the four-way valve 14, and the compressor 15, and is used to perform heat exchange processing on the first refrigerant provided by the evaporator and the second refrigerant provided by the condenser, and transfer the gaseous refrigerant after heat exchange to the compressor 15;

[0047] The compressor 15 is connected to the indoor heat exchanger 11 and the outdoor heat exchanger 12 through the four-way valve 14, and is used to perform different compression processes on the gaseous refrigerant in the cooling mode or the heating mode to release corresponding cooling capacity or heating capacity, thereby achieving cooling or heating of the air conditioner;

[0048] The indoor unit electronic expansion valve 24 is respectively connected to the indoor unit heat exchanger and the multifunctional vapor-liquid separator, and is used to throttle and reduce the pressure of the second refrigerant into the liquid first refrigerant in the cooling mode, so that the liquid first refrigerant enters the indoor unit heat exchanger and evaporates into the gaseous first refrigerant;

[0049] The outdoor unit electronic expansion valve 22 is respectively connected to the outdoor unit heat exchanger and the multifunctional vapor-liquid separator, and is used to throttle and reduce the pressure of the second refrigerant into the liquid first refrigerant in the heating mode, so that the liquid first refrigerant enters the outdoor unit heat exchanger and evaporates into the gaseous first refrigerant.

[0050] Specifically, in the cooling mode, the compressor 15 provides the third refrigerant to the outdoor unit heat exchanger 12 through the four-way valve 14. The temperature of the third refrigerant is higher than that of the second refrigerant, that is, the third refrigerant is used to indicate the high-temperature and high-pressure gaseous refrigerant. The outdoor unit heat exchanger 12 is used as a condenser to condense the third refrigerant discharged from the compressor 15, that is, to condense the third refrigerant into the second refrigerant. The second refrigerant is used to indicate the medium-temperature and high-pressure liquid refrigerant or the medium-temperature and high-pressure gas-liquid mixed refrigerant. The second refrigerant in the vapor-liquid separator passes through the outdoor unit electronic expansion valve 22 (at this time, the outdoor unit electronic expansion valve 22 is fully open and has no throttling effect, the same below) and enters the multifunctional vapor-liquid separator 13, and then passes through the indoor unit electronic expansion valve 24 to throttle and reduce the pressure to a low-temperature and low-pressure gas. The low-pressure liquid first refrigerant enters the indoor unit heat exchanger 11. The indoor unit heat exchanger 11 acts as an evaporator to evaporate the low-temperature and low-pressure liquid first refrigerant and convert it into a low-temperature and low-pressure gaseous (or low-temperature and low-pressure gas-liquid mixed) first refrigerant. The first refrigerant is used to indicate a low-temperature and low-pressure liquid refrigerant or a low-temperature and low-pressure gas-liquid mixed refrigerant or a low-temperature and low-pressure gaseous refrigerant. The indoor unit heat exchanger 11 evaporates the first refrigerant and provides it to the multi-functional vapor-liquid separator 13 through a four-way valve. The multi-functional vapor-liquid separator 13 exchanges heat with the first refrigerant provided by the indoor unit heat exchanger 11 and the second refrigerant provided by the outdoor unit heat exchanger 12, and transfers the exchanged low-temperature and low-pressure gaseous refrigerant back to the compressor 15 for compression processing to complete the refrigeration cycle.

[0051] In the heating mode, the compressor 15 provides the third refrigerant to the indoor heat exchanger 11 through the four-way valve 14. The indoor heat exchanger 11 acts as a condenser to condense the third refrigerant into the second refrigerant. The second refrigerant passes through the indoor electronic expansion valve 24 (at this time, the indoor electronic expansion valve 24 is fully open and has no throttling effect, the same below) and enters the multifunctional vapor-liquid separator 13. Then, it passes through the outdoor electronic expansion valve 22 and is throttled and depressurized into the low-temperature and low-pressure liquid first refrigerant, and enters the outdoor heat exchanger 12. The vapor-liquid separator The outdoor unit heat exchanger 12 acts as an evaporator to evaporate the low-temperature, low-pressure liquid first refrigerant and convert it into a low-temperature, low-pressure gaseous (or low-temperature, low-pressure gas-liquid mixture) first refrigerant, and then transfers the first refrigerant back to the multifunctional vapor-liquid separator 13 through the four-way valve 14. The multifunctional vapor-liquid separator 13 performs heat exchange on the first refrigerant provided by the outdoor unit heat exchanger 12 and the second refrigerant provided by the indoor unit heat exchanger 11, and transfers the low-temperature, low-pressure gaseous refrigerant after heat exchange back to the compressor 15 for compression processing to complete the heating cycle.

[0052] Whether in heating mode or cooling mode, the refrigerant temperatures provided by the indoor unit heat exchanger 11 and the outdoor unit heat exchanger 12 to the multifunctional vapor-liquid separator 13 are different. The multifunctional vapor-liquid separator 13 can not only play the role of gas-liquid separation, but also can exchange heat between the refrigerants of different temperatures provided by the indoor unit heat exchanger and the outdoor unit heat exchanger, thereby improving the supercooling degree of the air-conditioning system. When there is residual liquid refrigerant in the multifunctional vapor-liquid separator 13, the medium-temperature refrigerant provided by the indoor unit heat exchanger or the outdoor unit heat exchanger can also be used for heat exchange to evaporate the residual liquid refrigerant and provide circulating refrigerant to the air-conditioning pipeline as much as possible, thereby ensuring that the refrigerant circulation amount in the air-conditioning pipeline is sufficient, which will not affect the cooling or heating effect, and can also reduce the power consumption of the air-conditioning system and improve the energy efficiency of the air-conditioning system.

[0053] Furthermore, since the lubricating oil in the air conditioning system is often stored together with the low-temperature liquid refrigerant in the multifunctional vapor-liquid separator 13, less lubricating oil is returned to the compressor 15. Long-term operation may cause the compressor 15 to lack oil and wear, thereby reducing the operational reliability of the air conditioning system. However, by using the medium-temperature refrigerant provided by the indoor unit heat exchanger or the outdoor unit heat exchanger to evaporate the low-temperature liquid refrigerant stored in the multifunctional vapor-liquid separator 13, the lubricating oil melted in the low-temperature liquid refrigerant can be brought back to the compressor 15 through evaporation, ensuring that the compressor 15 will not lack oil, thereby improving the operational reliability of the air conditioning system.

[0054] In one embodiment, referring to Figure 2 The multifunctional vapor-liquid separator 13 includes a vapor-liquid separator body 131 and a capillary tube 132. The inlet of the vapor-liquid separator body 131 is connected to the four-way valve 14, and the outlet of the vapor-liquid separator body 131 is connected to the compressor 15. The capillary tube 132 is arranged at the bottom of the vapor-liquid separator body 131. Both ends of the capillary tube 132 are respectively provided with a liquid separation head 133. The first end of the capillary tube 132 is connected to the indoor unit heat exchanger 11 through the indoor unit electronic expansion valve 24, and the second end of the capillary tube 132 is connected to the first solenoid valve 16 provided outside the vapor-liquid separator body 131. The first solenoid valve 16 is connected to the outdoor unit heat exchanger 12 through the outdoor unit electronic expansion valve 22.

[0055] Specifically, in the cooling mode, the outdoor unit heat exchanger 12 transfers the second refrigerant to the capillary tube 132 through the outdoor unit electronic expansion valve 22 and the first solenoid valve 16. The capillary tube 132 then transfers the second refrigerant to the indoor unit electronic expansion valve 24, so that the second refrigerant is throttled and reduced in pressure to become the low-temperature, low-pressure liquid first refrigerant, which then enters the indoor unit heat exchanger 11. The low-temperature, low-pressure liquid first refrigerant evaporates in the indoor unit heat exchanger 11 and is converted into the low-temperature, low-pressure gaseous state (or a low-temperature, low-pressure gas-liquid mixture) of the first refrigerant, and the first refrigerant is transferred to the inlet of the vapor-liquid separator body 131 through the four-way valve 14. The pipe mouth indicates the first refrigerant of low-temperature and low-pressure gaseous refrigerant or low-temperature and low-pressure gas-liquid mixed refrigerant outside the capillary tube 132 in the vapor-liquid separator body 131, and performs heat exchange with the second refrigerant indicating medium-temperature and high-pressure liquid refrigerant or medium-temperature and high-pressure gas-liquid mixed refrigerant in the capillary tube 132. The temperature of the second refrigerant can be reduced and the temperature of the first refrigerant can be increased. The low-temperature liquid refrigerant outside the capillary tube 132 in the vapor-liquid separator body 131 is evaporated by heat exchange, so that the low-temperature and low-pressure gaseous refrigerant after heat exchange is discharged to the compressor 15 through the outlet pipe of the vapor-liquid separator body 131.

[0056] In the heating mode, the indoor unit heat exchanger 11 transfers the second refrigerant to the capillary tube 132 through the indoor unit electronic expansion valve 24, and the capillary tube 132 then transfers the second refrigerant to the outdoor unit electronic expansion valve 22 through the first solenoid valve 16, so that the second refrigerant is throttled and reduced in pressure to become a low-temperature, low-pressure liquid first refrigerant, and then enters the outdoor unit heat exchanger 12. The low-temperature, low-pressure liquid first refrigerant evaporates in the outdoor unit heat exchanger 12 and is converted into a low-temperature, low-pressure gaseous (or low-temperature, low-pressure gas-liquid mixture) first refrigerant, and the first refrigerant is transferred to the inlet of the vapor-liquid separator body 131 through the four-way valve 14. The first refrigerant indicating low-temperature and low-pressure gaseous refrigerant or low-temperature and low-pressure gas-liquid mixed refrigerant located outside the capillary tube 132 in the vapor-liquid separator body 131 performs heat exchange with the second refrigerant indicating medium-temperature and high-pressure liquid refrigerant or medium-temperature and high-pressure gas-liquid mixed refrigerant in the capillary tube 132, which can reduce the temperature of the second refrigerant and increase the temperature of the first refrigerant, and perform heat exchange and evaporation on the low-temperature liquid refrigerant located outside the capillary tube 132 in the vapor-liquid separator body 131, thereby discharging the heat-exchanged low-temperature and low-pressure gaseous refrigerant to the compressor 15 through the outlet pipe of the vapor-liquid separator body 131.

[0057] In one embodiment, referring to Figure 3 The inlet and outlet of the vapor-liquid separator body 131 are respectively arranged at the top of the vapor-liquid separator body 131, and the inlet and outlet are respectively provided with a temperature sensor 23 for detecting the inlet temperature and the outlet temperature.

[0058] In one embodiment, referring to Figure 3The air-conditioning system also includes a second solenoid valve 17, the first end of the second solenoid valve 17 is respectively connected to the first solenoid valve 16 and the outdoor unit electronic expansion valve 22, and the second end of the solenoid valve is respectively connected to the first end of the capillary tube 132 and the indoor unit electronic expansion valve 24.

[0059] Specifically, when the second solenoid valve 17 is closed, the indoor unit heat exchanger 11 or the outdoor unit heat exchanger 12 will transfer all the second refrigerant through the indoor unit electronic expansion valve 24 or the outdoor unit electronic expansion valve 22 to the capillary tube 132 to participate in the heat exchange process, but when the second solenoid valve 17 is opened, the indoor unit heat exchanger 11 or the outdoor unit heat exchanger 12 will transfer part of the second refrigerant through the indoor unit electronic expansion valve 24 or the outdoor unit electronic expansion valve 22 to the capillary tube 132 to participate in the heat exchange process, and pass the other part of the second refrigerant directly through the second solenoid valve 17. The two parts of refrigerant are finally merged and transferred to the outdoor unit electronic expansion valve 22 or the indoor unit electronic expansion valve 24, and then enter the outdoor unit heat exchanger 12 or the indoor unit heat exchanger 11 to evaporate after throttling and reducing the pressure to the first refrigerant. Because part of the second refrigerant passes through the second solenoid valve 17, the second refrigerant in the capillary tube 132 is less than when the second solenoid valve 17 is closed, thereby reducing the second refrigerant participating in the heat exchange and preventing the temperature difference between the inlet and outlet of the vapor-liquid separator body 131 from being too large.

[0060] The switching state of the second electromagnetic valve 17 in the refrigeration mode is determined by the temperature difference between the inlet and outlet of the gas-liquid separator body 131. If the outdoor ambient temperature is less than or equal to a first preset temperature, the second electromagnetic valve is closed. The first preset temperature can be personalized according to different scenes, and in this embodiment, the first preset temperature is set to 10℃. If the outdoor ambient temperature is greater than the first preset temperature, and the temperature difference between the inlet and outlet of the gas-liquid separator body 131 is less than a preset temperature difference, the second electromagnetic valve 17 is closed. The temperature difference between the inlet and outlet of the gas-liquid separator body 131 refers to the difference between the inlet and outlet temperatures of the gas-liquid separator body 131, and the preset temperature difference can be personalized according to different scenes, and in this embodiment, the preset temperature difference is set to 5℃. If the outdoor ambient temperature is greater than the first preset temperature, and the temperature difference between the inlet and outlet of the gas-liquid separator body 131 is greater than or equal to the first preset temperature, indicating that the amount of second refrigerant in the capillary tube 132 is too large, causing the temperature difference between the inlet and outlet to be too large, and the amount of second refrigerant in the capillary tube 132 needs to be reduced, the second electromagnetic valve 17 is opened, and part of the second refrigerant is diverted through the second electromagnetic valve 17 to reduce the amount of second refrigerant in the capillary tube 132. After the second electromagnetic valve 17 is opened, if the temperature difference between the inlet and outlet of the gas-liquid separator body 131 is still greater than or equal to the first preset temperature according to the first preset period, indicating that the amount of second refrigerant in the capillary tube 132 is still too large, the first electromagnetic valve 16 is closed, i.e. no second refrigerant is provided for the capillary tube 132, and all second refrigerant is directly transferred from the outdoor heat exchanger 12 to the indoor electronic expansion valve 24 through the second electromagnetic valve 17, and after being throttled and pressure-reduced by the indoor electronic expansion valve 24, the first refrigerant enters the indoor heat exchanger 11 to evaporate. The first preset period can be any length of time, and in this embodiment, the first preset period is set to 10 minutes.

[0061] The outdoor heat exchanger 12 of the air conditioning system often frosts after a period of operation during the heating operation in winter, so the switching state of the second electromagnetic valve 17 in the heating mode is determined by the defrosting frequency of the outdoor heat exchanger 12 within a preset period. If the outdoor ambient temperature is less than or equal to a second preset temperature, which can be personalized according to different scenes, and is -5℃ in this embodiment, it belongs to low-temperature heating, at this time the air contains less water vapor, and the outdoor heat exchanger 12 basically does not frost, so the second electromagnetic valve 17 is closed, and only the first electromagnetic valve 16 and the capillary tube 132 are used to transfer the second refrigerant. The second refrigerant (medium-temperature liquid refrigerant) in the capillary tube 132 exchanges heat with the first refrigerant (low-temperature gaseous refrigerant or low-temperature liquid refrigerant or low-temperature gaseous-liquid mixed refrigerant) outside the capillary tube 132, improves the supercooling degree, and increases the suction temperature and suction superheat of the compressor 15. If there is liquid refrigerant in the gas-liquid separator body 131, heat exchange and evaporation can be performed to reduce the liquid refrigerant in the gas-liquid separator body 131, and the lubricating oil melted in the liquid refrigerant is brought back to the compressor 15 through evaporation to ensure that the compressor 15 does not operate with insufficient oil. Generally, when the outdoor ambient temperature is too low, such as below -30℃, or when the air conditioning system is in low-load operation, or when the outdoor heat exchanger 12 frosts, liquid refrigerant will be stored in the gas-liquid separator.

[0062] If the outdoor ambient temperature is greater than the second preset temperature, and the number of defrost times of the outdoor unit heat exchanger 12 in the third preset cycle is less than the preset number, the second solenoid valve 17 is closed; if the outdoor ambient temperature is greater than the second preset temperature, and the number of defrost times of the outdoor unit heat exchanger 12 in the third preset cycle is greater than or equal to the preset number, it means that the outdoor unit heat exchanger 12 defrosts more frequently, and in order to reduce the number of defrost times, it is necessary to increase the temperature of the second refrigerant supplied to the outdoor unit electronic expansion valve 22, so that the second solenoid valve 17 is opened, and part of the second refrigerant is diverted through the second solenoid valve 17, that is, the amount of the second refrigerant participating in heat exchange in the capillary tube 132 is reduced, thereby increasing the temperature of the second refrigerant transmitted to the outdoor unit electronic expansion valve 22; when the second solenoid valve 17 is opened, a portion of the second refrigerant is diverted, i.e., the amount of the second refrigerant participating in heat exchange in the capillary tube 132 is reduced, thereby increasing the temperature of the second refrigerant transmitted to the outdoor unit electronic expansion valve 22; After the solenoid valve 17 is closed, if the number of defrosts performed by the outdoor heat exchanger 12 within the third preset period is still greater than or equal to the preset number, this indicates that the temperature of the second refrigerant received by the outdoor electronic expansion valve 22 is still low. After being throttled and reduced in pressure by the outdoor electronic expansion valve 22 to become the first refrigerant, the temperature is too low and is prone to frost formation. The first solenoid valve 16 is then closed, prohibiting the second refrigerant from being supplied to the capillary tube 132 for heat exchange. All the second refrigerant, which has not been heat exchanged and reduced in temperature, is directly transferred from the indoor electronic expansion valve 24 to the outdoor electronic expansion valve 22 through the second solenoid valve 17. After being throttled and reduced in pressure by the outdoor electronic expansion valve 22, it becomes the first refrigerant and then enters the outdoor heat exchanger 12. At this time, the temperature of the first refrigerant is higher than before, thereby reducing the number of defrosts. The preset period can be a period of any length. In this embodiment, the third preset period is 2 hours. The preset number of times can be any value. In this embodiment, the preset number of times is 3.

[0063] In one embodiment, the air-conditioning system further includes an injection enthalpy component, which is respectively connected to the first solenoid valve 16, the second solenoid valve 17, the outdoor unit electronic expansion valve 22, and the compressor 15, and is used to perform injection enthalpy increase processing on the air-conditioning system.

[0064] Specifically, the principle of enthalpy injection is to throttle and reduce the pressure of the second refrigerant into the first refrigerant through the subcooler electronic expansion valve 18, exchange heat with the second refrigerant in the subcooler 17, reduce the temperature of the second refrigerant, and the first refrigerant absorbs heat and flows out of the subcooler and is sprayed into the compressor, increasing the exhaust enthalpy value of the compressor.

[0065] In one embodiment, referring to Figure 4 The enthalpy injection component includes a subcooler 107, a subcooling electronic expansion valve 18, and a enthalpy injection electronic expansion valve 19. The subcooling electronic expansion valve 18 is respectively connected to the first solenoid valve 16, the second solenoid valve 17, and the subcooler 107. The subcooler 107 is connected to the outdoor unit heat exchanger 12 through the outdoor unit electronic expansion valve 22. The subcooler 107 is also connected to the compressor 15 through the enthalpy injection electronic expansion valve 19.

[0066] Specifically, when the air-conditioning system needs to spray enthalpy, the second refrigerant is throttled and reduced in pressure through the subcooling electronic expansion valve 18 to become a low-temperature, low-pressure gas or a low-temperature, low-pressure gas-liquid mixture of the first refrigerant, and then exchanges heat with the second refrigerant in the subcooler 107 to reduce the temperature of the second refrigerant. After the first refrigerant flows out of the subcooler 107, it passes through the spray enthalpy electronic expansion valve 19 and enters the compressor 15 to perform jet enthalpy increase treatment on the air-conditioning system, thereby increasing the cooling capacity or heating capacity.

[0067] In one embodiment, referring to Figure 5 The air-conditioning system also includes a third solenoid valve 20, the first end of the third solenoid valve 20 is respectively connected to the spray enthalpy electronic expansion valve 19 and the subcooler 107, and the second end of the third solenoid valve 20 is connected to the vapor-liquid separator body 131.

[0068] Specifically, when the air conditioning system does not open the injection enthalpy but only opens the supercooling, the injection enthalpy electronic expansion valve 19 is closed, the third solenoid valve 20 is opened, and the first refrigerant output from the supercooler is transferred to the vapor-liquid separator body 131 through the third solenoid valve 20.

[0069] In one embodiment, referring to Figure 6 An oil separator 21 is further provided between the compressor 15 and the four-way valve 14. The oil separator 21 can separate the lubricating oil in the refrigerant and return it to the compressor 15, thereby preventing the lubricating oil in the compressor 15 from gradually entering the refrigerant circulation pipeline and causing the compressor 15 to be short of oil, thereby improving the operational reliability of the air conditioning system.

[0070] In one embodiment, Figure 7 A flow chart of an air conditioning control method in one embodiment is shown in FIG. Figure 7 , provides an air conditioning control method. This embodiment mainly uses the method applied to an air conditioning control device as an example to illustrate, and the air conditioning control method specifically includes the following steps:

[0071] Step S210 , obtaining the outdoor ambient temperature and air-conditioning operating parameters of the air-conditioning system, wherein the air-conditioning system includes a multifunctional vapor-liquid separator 13 , an evaporator, a condenser, a four-way valve, an electronic expansion valve, and a compressor.

[0072] Specifically, the air conditioning system includes an indoor heat exchanger 11, an outdoor heat exchanger 12, a four-way valve 14, an outdoor electronic expansion valve 22, an indoor electronic expansion valve 24, and a compressor 15. In cooling mode, the indoor heat exchanger 11 functions as an evaporator and the outdoor heat exchanger 12 functions as a condenser. In heating mode, the outdoor heat exchanger 12 functions as an evaporator and the indoor heat exchanger 11 functions as a condenser. Air conditioning operating parameters include the current operating mode of the air conditioning system, the inlet and outlet pipe temperature difference of the multi-function vapor-liquid separator 13, and the number of defrost cycles.

[0073] Step S220: determining a target operating mode according to the outdoor ambient temperature and the air-conditioning operating parameters.

[0074] Specifically, the operating state of the air-conditioning system can be determined according to the outdoor ambient temperature, namely, low-temperature cooling, low-temperature heating, high-temperature cooling, high-temperature heating, etc., and then the target operating mode for controlling the operation of the air-conditioning system can be further determined in combination with the air-conditioning operating parameters. The target operating mode includes cooling mode and heating mode, and the cooling mode specifically includes the first cooling mode, the second cooling mode, and the third cooling mode, while the heating mode specifically includes the first heating mode, the second heating mode, and the third heating mode. The intake air temperature provided to the compressor 15 is different in different cooling modes, and the refrigerant temperature provided to the outdoor unit heat exchanger 12 is different in different heating modes.

[0075] Step S230, when the target operation mode is the preset heat exchange mode, controlling the multifunctional vapor-liquid separator 13 to perform heat exchange processing on the first refrigerant provided by the evaporator and the second refrigerant provided by the condenser, wherein the temperature of the first refrigerant is lower than the temperature of the second refrigerant.

[0076] Specifically, the preset heat exchange mode is any one of the first cooling mode, the second cooling mode, the first heating mode, and the second heating mode. When the target operating mode is the preset heat exchange mode, the multifunctional vapor-liquid separator 13 is controlled to perform heat exchange processing on the first refrigerant provided by the evaporator and the second refrigerant provided by the condenser. The first refrigerant is used to indicate a low-temperature, low-pressure liquid refrigerant, a low-temperature, low-pressure gas-liquid mixed refrigerant, or a low-temperature, low-pressure gaseous refrigerant, and the second refrigerant is used to indicate a medium-temperature, high-pressure liquid refrigerant or a medium-temperature, high-pressure gas-liquid mixed refrigerant. The low-temperature first refrigerant is heat exchanged with the medium-temperature second refrigerant, thereby improving the supercooling degree of the air-conditioning system.

[0077] In one embodiment, determining the target operating mode according to the outdoor ambient temperature and the air conditioning operating parameters includes:

[0078] When the current operating mode in the air-conditioning operating parameters is the cooling mode and the outdoor ambient temperature is less than or equal to a first preset temperature, the first cooling mode is determined as the target operating mode, wherein the multifunctional vapor-liquid separator uses all of the second refrigerant to perform heat exchange processing with the first refrigerant in the first cooling mode; or

[0079] When the outdoor ambient temperature is greater than a first preset temperature, the first cooling mode is determined as the target operating mode, and whether the first inlet and outlet temperature difference of the multifunctional vapor-liquid separator 13 in the air-conditioning operating parameter is less than a preset temperature difference is determined according to a first preset period;

[0080] When the first inlet and outlet pipe temperature difference is less than the preset temperature difference, the first cooling mode is maintained as the target operation mode.

[0081] Specifically, the current operating mode of the air-conditioning system is the cooling mode, indicating that the air-conditioning system is currently cooling. Then, it is determined whether the outdoor ambient temperature is greater than the first preset temperature. The outdoor ambient temperature is recorded as T, and the first preset temperature is recorded as T3. If the outdoor ambient temperature is less than or equal to the first preset temperature, that is, T≤T3, the first cooling mode is determined as the target operating mode. Figure 8 The operation process of the air-conditioning system in the first cooling mode is as follows: the refrigerant passes through the compressor 15, the oil separator 21, the four-way valve 14, the outdoor unit heat exchanger 12, the outdoor unit electronic expansion valve 22, the subcooler 107, the first solenoid valve 16, the capillary tube 132 of the multi-functional vapor-liquid separator 13, the indoor unit electronic expansion valve 24, the indoor unit heat exchanger 11, the four-way valve 14, the inlet of the multi-functional vapor-liquid separator 13, the outlet of the multi-functional vapor-liquid separator 13, and the compressor 15 in sequence, completing the refrigerant circulation.

[0082] Among them, the outdoor unit heat exchanger 12 acts as a condenser to provide the capillary tube 132 in the multifunctional vapor-liquid separator 13 with a medium-temperature and high-pressure second refrigerant, and the indoor unit heat exchanger 11 provides the multifunctional vapor-liquid separator 13 with a low-temperature and low-pressure first refrigerant through the four-way valve 14. The multifunctional vapor-liquid separator 13 can now act as a heat exchanger to perform heat exchange processing on the first refrigerant and the second refrigerant, and transfer the gaseous refrigerant after heat exchange back to the compressor 15.

[0083] When the outdoor environment temperature T≤T3 is turned on for cooling, it is low-temperature cooling. There may be liquid refrigerant in the multifunctional vapor-liquid separator 13. For example, the indoor temperature setting of -5℃ is too low, or the air-conditioning system is running at low load, which may cause liquid refrigerant to exist in the multifunctional vapor-liquid separator 13. In this case, it is operated by default in the first cooling mode. At this time, the capillary 132 of the multifunctional vapor-liquid separator 13 contains the medium-temperature liquid second refrigerant, and the medium-temperature liquid refrigerant is the second refrigerant. The outside of the capillary 132 is the low-temperature gaseous or liquid or gas-liquid mixed first refrigerant, that is, the first refrigerant is a low-temperature gaseous or liquid refrigerant. The capillary 132 exchanges heat inside and outside, reduces the temperature of the medium-temperature liquid refrigerant in the capillary 132, and then provides it to the indoor unit electronic expansion valve 24 for throttling and reducing the pressure to the low-temperature and low-pressure liquid first refrigerant, and then enters the indoor unit heat exchanger 11 for evaporation treatment, thereby improving the supercooling of the air-conditioning system and also improving the suction temperature and suction superheat of the compressor 15. If liquid refrigerant is present, the liquid refrigerant can be evaporated, and the lubricating oil melted in the liquid refrigerant can be brought back to the compressor 15 through the evaporation flow, thereby achieving an oil return effect to ensure that the compressor 15 does not run without oil, thereby improving the reliability of the air-conditioning system operation.

[0084] If the outdoor ambient temperature is greater than the first preset temperature, that is, T>T3, the air-conditioning system is controlled to operate in the first cooling mode, and the first inlet and outlet pipe temperature difference of the multifunctional vapor-liquid separator 13 is judged according to the first preset period. Whether it is less than the preset temperature difference, the inlet and outlet pipe temperature difference refers to the difference between the inlet pipe temperature and the outlet pipe temperature of the vapor-liquid separator body 131, T1 is used to indicate the inlet pipe temperature, T2 indicates the outlet pipe temperature, △T is used to indicate the preset temperature difference. In combination with the above embodiment, let △T=5℃, that is, judge whether T1-T2<△T is established. If so, continue to operate in the first cooling mode.

[0085] In one embodiment, when the outdoor ambient temperature is greater than a first preset temperature, after determining the first cooling mode as the target operating mode and periodically determining whether the first inlet and outlet temperature difference of the multifunctional vapor-liquid separator 13 in the air-conditioning operating parameters is less than a preset temperature difference according to a first preset period, the method further includes:

[0086] When the first inlet and outlet pipe temperature difference is greater than or equal to the preset temperature difference, the target operating mode is switched from the first cooling mode to the second cooling mode, and whether the second inlet and outlet pipe temperature difference of the multifunctional vapor-liquid separator 13 in the air conditioning operating parameter is less than the preset temperature difference is determined according to a second preset period;

[0087] When the second inlet and outlet pipe temperature difference is less than the preset temperature difference, maintaining the second cooling mode as the target operation mode; or,

[0088] When the temperature difference between the second inlet and outlet pipes is greater than or equal to the preset temperature difference, the target operating mode is switched from the second refrigeration mode to the third refrigeration mode, wherein the multifunctional vapor-liquid separator 13 does not perform heat exchange processing between the second refrigerant and the first refrigerant in the third refrigeration mode.

[0089] Specifically, refer to Figure 9 The operation process of the air-conditioning system in the second cooling mode is as follows: the refrigerant passes through the compressor 15, the oil separator 21, the four-way valve 14, the outdoor unit heat exchanger 12, the outdoor unit electronic expansion valve 22, the subcooler 107, the second solenoid valve 17 and (the first solenoid valve 16 + the capillary 132 of the multi-functional vapor-liquid separator 13), the indoor unit electronic expansion valve 24, the indoor unit heat exchanger 11, the four-way valve 14, the inlet of the multi-functional vapor-liquid separator 13, the outlet of the multi-functional vapor-liquid separator 13, and the compressor 15 in sequence to complete the refrigerant circulation.

[0090] Reference Figure 10The operation process of the air-conditioning system in the third cooling mode is as follows: the refrigerant passes through the compressor 15, the oil separator 21, the four-way valve 14, the outdoor unit heat exchanger 12, the outdoor unit electronic expansion valve 22, the subcooler 107, the second solenoid valve 17, the indoor unit electronic expansion valve 24, the indoor unit heat exchanger 11, the four-way valve 14, the inlet of the multi-functional vapor-liquid separator 13, the outlet of the multi-functional vapor-liquid separator 13, and the compressor 15 in sequence to complete the refrigerant circulation.

[0091] When T1-T2≥△T, it means that there is too much medium-temperature liquid refrigerant in the capillary tube 132, resulting in too large a temperature difference between the inlet pipe temperature and the outlet pipe temperature of the multifunctional vapor-liquid separator 13. At this time, the first refrigeration mode is switched to the second refrigeration mode, that is, the second solenoid valve 17 is opened, and a part of the medium-temperature liquid refrigerant is bypassed through the pipeline where the second solenoid valve 17 is located, and then merged with the medium-temperature liquid refrigerant passing through the capillary tube 132 and transmitted to the indoor unit electronic expansion valve 24. After throttling and reducing the pressure of the indoor unit electronic expansion valve 24 to the first refrigerant, it is transmitted to the indoor unit heat exchanger 11. In this way, the medium-temperature liquid refrigerant inside the capillary tube 132 will be reduced, thereby reducing the difference △T between the inlet pipe temperature T1 and the outlet pipe temperature T2, so that T1-T2<△T. The second preset period can be the same as or different from the first preset period. In this embodiment, the second preset period is made the same as the first preset period, that is, combined with the above embodiment, the second preset period is made 10 minutes. If the air-conditioning system still detects T1-T2≥△T after running in the second cooling mode for 10 minutes, it means that there is still too much medium-temperature liquid refrigerant in the capillary tube 132, and then switches from the second cooling mode to the third cooling mode, that is, closes the first solenoid valve 16, and only opens the second solenoid valve 17, so that the medium-temperature liquid refrigerant no longer enters the capillary tube 132 in the vapor-liquid separator, and all the medium-temperature liquid refrigerant is transferred to the indoor unit electronic expansion valve 24 through the second solenoid valve 17, and is throttled and reduced in pressure to the first refrigerant by the indoor unit electronic expansion valve 24, and then transferred to the indoor unit heat exchanger 11, until the air-conditioning system is shut down and restarted and resumes operation in the first cooling mode.

[0092] In one embodiment, when the target operation mode is the preset heat exchange mode, controlling the multifunctional vapor-liquid separator 13 to perform heat exchange processing on the first refrigerant provided by the evaporator and the second refrigerant provided by the condenser includes:

[0093] When the target operating mode is the first cooling mode or the second cooling mode, the multifunctional vapor-liquid separator 13 is controlled to perform heat exchange processing on the first refrigerant provided by the indoor unit heat exchanger 11 and the second refrigerant provided by the outdoor unit heat exchanger 12, wherein the preset heat exchange mode is the first cooling mode or the second cooling mode, the indoor unit heat exchanger 11 in the air-conditioning system acts as an evaporator in the cooling mode, and the outdoor unit heat exchanger 12 in the air-conditioning system acts as a condenser in the cooling mode.

[0094] Specifically, in combination with the above embodiments, it can be seen that the preset heat exchange mode is the first cooling mode or the second cooling mode. In the third cooling mode, the multifunctional gas-liquid separator 13 can only play the role of gas-liquid separation, and cannot play the role of heat exchange of the heat exchanger.

[0095] In one embodiment, determining the target operating mode according to the outdoor ambient temperature and the air conditioning operating parameters includes:

[0096] When the current operating mode in the air-conditioning operating parameters is the heating mode and the outdoor ambient temperature is less than or equal to the second preset temperature, the first heating mode is determined as the target operating mode, wherein the multifunctional vapor-liquid separator utilizes all of the second refrigerant to perform heat exchange processing with the first refrigerant in the first heating mode; or

[0097] When the outdoor ambient temperature is greater than a second preset temperature, determining the first heating mode as the target operating mode, and periodically determining whether the first defrost times within the third preset period are less than a preset number according to a third preset period, wherein the air conditioning operating parameters also include the first defrost times;

[0098] When the first defrosting number is less than the preset number, the first heating mode is maintained as the target operation mode.

[0099] Specifically, when the air conditioning system is heating, it determines whether the outdoor ambient temperature is greater than a second preset temperature, denoted as T4. This determines whether T>T4 holds true. Based on the above embodiment, it can be seen that the second preset temperature is -5°C, i.e., T4=-5°C. If T≤T4, this is low-temperature heating. In this case, the air contains little water vapor, and the air conditioning system will essentially not frost during operation. In other words, the lower the outdoor ambient temperature, the less likely it is to frost. When the air conditioning system is operating, liquid refrigerant may be present in the multifunctional vapor-liquid separator 13. Therefore, the first heating mode is adopted, exchanging heat between the medium-temperature liquid refrigerant in the capillary tube 132 and the low-temperature gaseous, liquid, or gas-liquid mixed refrigerant outside the capillary tube 132, thereby increasing the degree of subcooling, the compressor suction temperature, and the suction superheat. If liquid refrigerant is present, it can be evaporated, and the lubricating oil dissolved in the liquid refrigerant can be brought back to the compressor 15 through the evaporative flow, thereby achieving an oil return effect for the compressor 15.

[0100] When the outdoor ambient temperature T>T4, frost is likely to form during the operation of the air conditioner, especially when the outdoor ambient temperature is within the range of -5℃~5℃. The outdoor heat exchanger 12 will frequently frost and defrost. It will first operate in the first heating mode. At this time, all the second refrigerant enters the capillary tube 132 of the multi-functional gas-liquid separator, and after operating in the first heating mode, the number of defrost times is collected regularly according to the third preset cycle. The preset number is 3, and the third preset cycle is T5=2h. If the number of defrost times N<3 times is detected within the third preset cycle, it means that the number of defrost times of the outdoor heat exchanger 12 is less, and the first heating mode can be maintained.

[0101] Reference Figure 11 The operation process of the air-conditioning system in the first heating mode is as follows: the refrigerant passes through the compressor 15, the oil separator 21, the four-way valve 14, the indoor unit heat exchanger 11, the indoor unit electronic expansion valve 24, the capillary tube 132 of the multi-functional vapor-liquid separator 13, the first solenoid valve 16, the subcooler 107, the outdoor unit electronic expansion valve 22, the outdoor unit heat exchanger 12, the four-way valve 14, the inlet of the multi-functional vapor-liquid separator 13, the outlet of the multi-functional vapor-liquid separator 13, and the compressor 15 in sequence, completing the refrigerant circulation.

[0102] In one embodiment, when the outdoor ambient temperature is greater than a second preset temperature, after determining the first heating mode as the target operating mode and determining whether the first defrost times within the third preset period are less than a preset number according to a third preset period, the method further includes:

[0103] When the first defrost number is greater than or equal to the preset number, the target operating mode is switched from the first heating mode to the second heating mode, and whether the second defrost number in the fourth preset period is less than the preset number is determined according to a fourth preset period, wherein the multifunctional vapor-liquid separator uses part of the second refrigerant to perform heat exchange processing with the first refrigerant in the second heating mode;

[0104] When the second defrosting number is less than the preset number, maintaining the second heating mode as the target operation mode; or,

[0105] When the second defrost number is greater than or equal to the preset number, the target operating mode is switched from the second heating mode to the third heating mode, wherein the multifunctional vapor-liquid separator does not perform heat exchange processing between the second refrigerant and the first refrigerant in the third heating mode.

[0106] Specifically, if the number of defrost times N≥3 times is detected within the third preset cycle, it means that defrost is too frequent. At this time, the first heating mode is switched to the second heating mode, that is, the second solenoid valve 17 is opened, and a part of the medium-temperature liquid refrigerant passes through the second solenoid valve 17, and then merges with the liquid refrigerant of the low-temperature first solenoid valve 16 flowing out of the vapor-liquid separator and flows into the outdoor unit electronic expansion valve 22. After being throttled and reduced in pressure to the first refrigerant by the outdoor unit electronic expansion valve 22, it enters the outdoor unit heat exchanger 12 to evaporate and absorb heat. The refrigerant passing through the second solenoid valve 17 does not exchange heat, so after merging with the refrigerant flowing out of the first solenoid valve 16, the temperature of the medium-temperature liquid refrigerant passing through the first solenoid valve 16 is higher than that in the first heating mode. The temperature of the refrigerant after throttling by the outdoor unit electronic expansion valve 22 will also be high, and the degree of supercooling will become smaller, so the number of frosts of the outdoor unit heat exchanger 12 can be reduced. If it is continued to be detected that the number of defrosts N<3 times in the third preset cycle T5, it means that the number of defrosts of the outdoor unit heat exchanger 12 in the corresponding period of the third preset cycle is relatively small, and the second heating mode can continue to be maintained.

[0107] If it is still detected that the number of defrost times N≥3 times in the third preset cycle T5, the operation is switched from the second heating mode to the third heating mode, that is, the first solenoid valve 16 is closed and only the second solenoid valve 17 is opened. The medium-temperature liquid refrigerant flowing out of the indoor unit heat exchanger 11 no longer flows into the vapor-liquid separator, but directly passes through the second solenoid valve 17 and the outdoor unit electronic expansion valve 22 in sequence to be throttled and reduced in pressure to the first refrigerant and then flows into the outdoor unit heat exchanger 12.

[0108] When the air conditioning system starts heating when the outdoor ambient temperature is greater than a first preset temperature, for example, when the outdoor ambient temperature is approximately 15°C and the outdoor heat exchanger 12 is no longer frosted, the first heating mode is used to increase the subcooling of the air conditioning system, thereby increasing the suction temperature and discharge temperature of the compressor 15, thereby increasing the heating capacity and improving the air conditioning energy efficiency. Specifically, when T < -5°C or T > 15°C, when the air conditioning system is not frosted, the first heating mode can be used to increase the subcooling and the suction temperature of the compressor 15, thereby increasing the heating capacity. However, when T is between -5°C and 5°C, the ambient temperature is more prone to frosting, and the degree of subcooling directly affects the frequency of frosting on the outdoor heat exchanger 12 (which serves as the evaporator). Therefore, the heating mode needs to be adjusted according to the above method.

[0109] Reference Figure 12The operation process of the air-conditioning system in the second heating mode is as follows: the refrigerant passes through the compressor 15, the oil separator 21, the four-way valve 14, the indoor unit heat exchanger 11, the indoor unit electronic expansion valve 24, the second solenoid valve 17 and (the first solenoid valve 16 + the capillary 132 of the multi-functional vapor-liquid separator 13), the subcooler 107, the outdoor unit electronic expansion valve 22, the outdoor unit heat exchanger 12, the four-way valve 14, the inlet of the multi-functional vapor-liquid separator 13, the outlet of the multi-functional vapor-liquid separator 13, and the compressor 15 in sequence to complete the refrigerant cycle.

[0110] Reference Figure 13 The operation process of the air-conditioning system in the third heating mode is as follows: the refrigerant passes through the compressor 15, the oil separator 21, the four-way valve 14, the indoor unit heat exchanger 11, the indoor unit electronic expansion valve 24, the second solenoid valve 17, the subcooler 107, the outdoor unit electronic expansion valve 22, the outdoor unit heat exchanger 12, the four-way valve 14, the inlet of the multi-functional vapor-liquid separator 13, the outlet of the multi-functional vapor-liquid separator 13, and the compressor 15 in sequence, completing the refrigerant circulation.

[0111] In one embodiment, when the target operation mode is the preset heat exchange mode, controlling the multifunctional vapor-liquid separator 13 to perform heat exchange processing on the first refrigerant provided by the evaporator and the second refrigerant provided by the condenser includes:

[0112] When the target operating mode is the first heating mode or the second heating mode, the multifunctional vapor-liquid separator 13 is controlled to perform heat exchange processing on the first refrigerant provided by the outdoor unit heat exchanger 12 and the second refrigerant provided by the indoor unit heat exchanger 11, wherein the preset heat exchange mode is the first heating mode or the second heating mode, the outdoor unit heat exchanger 12 in the air-conditioning system acts as an evaporator in the heating mode, and the indoor unit heat exchanger 11 in the air-conditioning system acts as a condenser in the heating mode.

[0113] Specifically, in combination with the above embodiments, it can be seen that the preset heat exchange mode is the first heating mode or the second heating mode. In the third heating mode, the multifunctional gas-liquid separator 13 can only play the role of gas-liquid separation and cannot play the role of heat exchange of the heat exchanger.

[0114] In a specific embodiment, referring to Figure 14 , when the air conditioning system is in cooling operation:

[0115] If T≤T3=10℃, the air conditioner maintains cooling mode 1 (i.e. the first cooling mode);

[0116] If T>T3=10℃, the air conditioner will default to cooling mode 1 after it is turned on, and then check every 10 minutes to see if T1-T2≥△T=5℃;

[0117] If T1-T2<△T=5℃, maintain the refrigeration mode 1 to run, and continue to detect every 10 minutes whether T1-T2≥△T=5℃;

[0118] If T1-T2≥△T=5℃, switch from the refrigeration mode 1 to the refrigeration mode 2 (i.e. the second refrigeration mode), at this time the second electromagnetic valve 17 is opened, and then detect every 10 minutes whether T1-T2≥△T=5℃;

[0119] If T1-T2<△T=5℃, maintain the refrigeration mode 2 to continue to run, and continue to detect every 10 minutes whether T1-T2≥△T=5℃;

[0120] If T1-T2≥△T=5℃, switch from the refrigeration mode 2 to the refrigeration mode 3 (i.e. the third refrigeration mode), at this time the first electromagnetic valve 16 is closed, only the second electromagnetic valve 17 is opened, and until the air conditioner is restarted after shutdown to restore the refrigeration mode 1.

[0121] Referring to Figure 15 , when the air conditioning system is in heating operation:

[0122] If T≤T4=-5℃, the air conditioner maintains the heating mode 1 (i.e. the first heating mode) to run;

[0123] If T>T4=-5℃, the air conditioner is started by default in the heating mode 1, and then detect every T5=2h whether the defrosting frequency N of the air conditioner in this time period is ≥3;

[0124] If N<3, maintain the heating mode 1 to run, and continue to detect every T5=2h whether the defrosting frequency N of the air conditioner in this time period is ≥3;

[0125] If N≥3, switch from the heating mode 1 to the heating mode 2 (i.e. the second heating mode), at this time the second electromagnetic valve 17 is opened, and continue to detect every T5=2h whether the defrosting frequency N of the air conditioner in this time period is ≥3;

[0126] If N<3, maintain the heating mode 2 to continue to run, and continue to detect every T5=2h whether the defrosting frequency N of the air conditioner in this time period is ≥3;

[0127] If N≥3, switch from the heating mode 2 to the heating mode 3 (i.e. the third heating mode), at this time the first electromagnetic valve 16 is closed, only the second electromagnetic valve 17 is opened, and until the air conditioner is restarted after shutdown to restore the heating mode 1.

[0128] When the air-conditioning system requires enthalpy injection, the refrigerant passes through the subcooling electronic expansion valve 18, the subcooler 107, and the enthalpy injection electronic expansion valve 19 in sequence and enters the compressor 15; if the air-conditioning only requires subcooling, the enthalpy injection electronic expansion valve 19 is closed, the third solenoid valve 20 is opened, and the refrigerant enters the multifunctional vapor-liquid separator 13 through the third solenoid valve 20.

[0129] Figure 7 、 14 15 is a flow chart of an air conditioning control method in one embodiment. It should be understood that although Figure 7 、 14 The steps in the flowchart of FIG15 are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Figure 7 、 14 At least part of the steps in 15 may include multiple sub-steps or multiple stages. These sub-steps or stages do not necessarily have to be executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0130] In one embodiment, Figure 16 As shown, an air conditioning control device is provided, comprising:

[0131] An acquisition module 310 is used to obtain outdoor ambient temperature and air conditioning operating parameters;

[0132] a determination module 320 for determining a target operating mode according to the outdoor ambient temperature and the air conditioning operating parameters;

[0133] The control module 330 is used to control the multifunctional vapor-liquid separator 13 to perform heat exchange processing on the first refrigerant provided by the evaporator and the second refrigerant provided by the condenser when the target operating mode is the preset heat exchange mode, wherein the temperature of the first refrigerant is lower than the temperature of the second refrigerant.

[0134] In one embodiment, the determining module 320 is further configured to:

[0135] When the current operating mode in the air-conditioning operating parameters is the cooling mode and the outdoor ambient temperature is less than or equal to a first preset temperature, the first cooling mode is determined as the target operating mode, wherein the multifunctional vapor-liquid separator uses all of the second refrigerant to perform heat exchange processing with the first refrigerant in the first cooling mode; or

[0136] determining the first refrigeration mode as the target operation mode when the outdoor ambient temperature is greater than a first preset temperature, and determining whether a first temperature difference between inlet and outlet pipes of the multifunctional gas-liquid separator 13 in the air conditioner operation parameters is less than a preset temperature difference according to a first preset periodic timing;

[0137] maintaining the first refrigeration mode as the target operation mode when the first temperature difference between inlet and outlet pipes is less than the preset temperature difference.

[0138] In one embodiment, the determining module 320 is further configured to:

[0139] switching the target operation mode from the first refrigeration mode to a second refrigeration mode when the first temperature difference between inlet and outlet pipes is greater than or equal to the preset temperature difference, and determining whether a second temperature difference between inlet and outlet pipes of the multifunctional gas-liquid separator 13 in the air conditioner operation parameters is less than a preset temperature difference according to a second preset periodic timing;

[0140] maintaining the second refrigeration mode as the target operation mode when the second temperature difference between inlet and outlet pipes is less than the preset temperature difference; or,

[0141] switching the target operation mode from the second refrigeration mode to a third refrigeration mode when the second temperature difference between inlet and outlet pipes is greater than or equal to the preset temperature difference, wherein the multifunctional gas-liquid separator 13 does not perform heat exchange treatment on the second refrigerant and the first refrigerant in the third refrigeration mode.

[0142] In one embodiment, the control module 330 is further configured to:

[0143] controlling the multifunctional gas-liquid separator 13 to perform heat exchange treatment on the first refrigerant provided by the indoor heat exchanger 11 and the second refrigerant provided by the outdoor heat exchanger 12 when the target operation mode is the first refrigeration mode or the second refrigeration mode, wherein the preset heat exchange mode is the first refrigeration mode or the second refrigeration mode, the indoor heat exchanger 11 in the air conditioner system functions as an evaporator in the refrigeration mode, and the outdoor heat exchanger 12 in the air conditioner system functions as a condenser in the refrigeration mode.

[0144] In one embodiment, the determining module 320 is further configured to:

[0145] determining a first heating mode as the target operation mode when the current operation mode in the air conditioner operation parameters is a heating mode and the outdoor ambient temperature is less than or equal to a second preset temperature, wherein the multifunctional gas-liquid separator 13 performs heat exchange treatment on all of the second refrigerant and the first refrigerant in the first heating mode; or,

[0146] determining the first heating mode as the target operation mode when the outdoor environment temperature is greater than the second preset temperature, and determining whether a first defrosting frequency within a third preset period is less than a preset frequency according to a third preset period timing, wherein the air conditioner operation parameter further comprises the first defrosting frequency;

[0147] maintaining the first heating mode as the target operation mode when the first defrosting frequency is less than the preset frequency.

[0148] In one embodiment, the determining module 320 is further configured to:

[0149] switching the target operation mode from the first heating mode to a second heating mode when the first defrosting frequency is greater than or equal to the preset frequency, and determining whether a second defrosting frequency within a fourth preset period is less than a preset frequency according to a fourth preset period timing, wherein the multifunctional gas-liquid separator 13 performs heat exchange treatment on the second refrigerant and the first refrigerant in the second heating mode;

[0150] maintaining the second heating mode as the target operation mode when the second defrosting frequency is less than the preset frequency; or,

[0151] switching the target operation mode from the second heating mode to a third heating mode when the second defrosting frequency is greater than or equal to the preset frequency, wherein the multifunctional gas-liquid separator 13 does not perform heat exchange treatment on the second refrigerant and the first refrigerant in the third heating mode.

[0152] In one embodiment, the control module 330 is further configured to:

[0153] controlling the multifunctional gas-liquid separator 13 to perform heat exchange treatment on the first refrigerant provided by the outdoor heat exchanger 12 and the second refrigerant provided by the indoor heat exchanger 11 when the target operation mode is the first heating mode or the second heating mode, wherein the preset heat exchange mode is the first heating mode or the second heating mode, the outdoor heat exchanger 12 in the air conditioning system functions as an evaporator in the heating mode, and the indoor heat exchanger 11 in the air conditioning system functions as a condenser in the heating mode.

[0154] As shown in Figure 17 The embodiment of the present application provides a computer device, which comprises a processor 711, a communication interface 712, a memory 713 and a communication bus 714, wherein the processor 711, the communication interface 712 and the memory 713 complete mutual communication through the communication bus 714;

[0155] The memory 713 is used for storing a computer program.

[0156] In one embodiment of the present application, the processor 711 is configured to implement the air conditioning control method provided by any one of the aforementioned method embodiments when executing a program stored in the memory 713 .

[0157] Those skilled in the art will understand that Figure 17 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the air-conditioning system to which the solution of the present application is applied. The specific air-conditioning system may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0158] In one embodiment, the air conditioning control device provided by the present application can be implemented in the form of a computer program. The computer program can be used in Figure 17 The memory of the air conditioning system can store various program modules that constitute the air conditioning control device, such as Figure 16 The acquisition module 310, determination module 320 and control module 330 are shown. The computer program composed of various program modules enables the processor to execute the steps of the air conditioning control method of each embodiment of the present application described in this specification.

[0159] Figure 17 The air conditioning system shown can be Figure 16 The acquisition module 310 in the illustrated air conditioning control device acquires the outdoor ambient temperature and air conditioning operating parameters. The air conditioning system can determine a target operating mode based on the outdoor ambient temperature and the air conditioning operating parameters through a determination module 320. The air conditioning system can control the multifunctional vapor-liquid separator 13 to perform heat exchange processing between the first refrigerant provided by the evaporator and the second refrigerant provided by the condenser, when the target operating mode is a preset heat exchange mode, through a control module 330, wherein the temperature of the first refrigerant is lower than that of the second refrigerant.

[0160] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the air conditioning control method provided in any of the aforementioned method embodiments are implemented.

[0161] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0162] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a general hardware platform, or of course, by means of hardware. Based on this understanding, the essence of the above technical solution or the portion that contributes to the relevant technology can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling an air conditioning system (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0163] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0164] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An air conditioning control method, characterized in that: The method comprises: Obtaining an outdoor ambient temperature and air-conditioning operating parameters of an air-conditioning system, wherein the air-conditioning system includes a multifunctional vapor-liquid separator, an indoor unit heat exchanger, an outdoor unit heat exchanger, an electronic expansion valve, a four-way valve, and a compressor; the electronic expansion valve includes an outdoor unit electronic expansion valve and an indoor unit electronic expansion valve; the multifunctional vapor-liquid separator includes a vapor-liquid separator body and a capillary tube; an inlet of the vapor-liquid separator body is connected to the four-way valve; an outlet of the vapor-liquid separator body is connected to the compressor; the capillary tube is disposed at an inner bottom of the vapor-liquid separator body; liquid separator heads are provided at both ends of the capillary tube; a first end of the capillary tube is connected to the indoor unit electronic expansion valve; a second end of the capillary tube is connected to a first solenoid valve disposed outside the vapor-liquid separator body; and the first solenoid valve is further connected to the outdoor unit electronic expansion valve; The indoor unit heat exchanger is used to serve as an evaporator to provide a first refrigerant to the multifunctional vapor-liquid separator in cooling mode, and to serve as a condenser to provide a second refrigerant to the multifunctional vapor-liquid separator in heating mode. The outdoor unit heat exchanger is used to serve as a condenser to provide the second refrigerant to the multifunctional vapor-liquid separator in cooling mode, and to serve as an evaporator to provide the first refrigerant to the multifunctional vapor-liquid separator in heating mode. In cooling mode, the outdoor unit heat exchanger sequentially transfers the second refrigerant through the outdoor unit electronic expansion valve, the first solenoid valve, the capillary tube, the indoor unit electronic expansion valve, the indoor unit heat exchanger, and the four-way valve to the vapor-liquid separator body for heat exchange. In heating mode, the indoor unit heat exchanger sequentially transfers the second refrigerant through the indoor unit electronic expansion valve, the capillary tube, the first solenoid valve, the outdoor unit electronic expansion valve, the outdoor unit heat exchanger, and the four-way valve to the vapor-liquid separator body for heat exchange. determining a target operating mode according to the outdoor ambient temperature and the air conditioning operating parameters; When the target operating mode is a preset heat exchange mode, the multifunctional vapor-liquid separator is controlled to perform heat exchange processing on the first refrigerant provided by the evaporator and the second refrigerant provided by the condenser, wherein the temperature of the first refrigerant is lower than the temperature of the second refrigerant.

2. The method according to claim 1, characterized in that The determining of the target operating mode according to the outdoor ambient temperature and the air-conditioning operating parameters includes: When the current operating mode in the air-conditioning operating parameters is the cooling mode and the outdoor ambient temperature is less than or equal to a first preset temperature, the first cooling mode is determined as the target operating mode, wherein the multifunctional vapor-liquid separator uses all of the second refrigerant to perform heat exchange processing with the first refrigerant in the first cooling mode; or When the outdoor ambient temperature is greater than a first preset temperature, the first cooling mode is determined as the target operating mode, and whether the first inlet and outlet temperature difference of the multifunctional vapor-liquid separator in the air-conditioning operating parameter is less than a preset temperature difference is determined periodically according to a first preset period; When the first inlet and outlet pipe temperature difference is less than the preset temperature difference, the first cooling mode is maintained as the target operation mode.

3. The method according to claim 2, characterized in that When the outdoor ambient temperature is greater than a first preset temperature, the first cooling mode is determined as the target operating mode, and after periodically determining whether a first inlet and outlet temperature difference of the multifunctional vapor-liquid separator in the air-conditioning operating parameter is less than a preset temperature difference according to a first preset period, the method further includes: When the first inlet and outlet pipe temperature difference is greater than or equal to the preset temperature difference, the target operating mode is switched from the first cooling mode to the second cooling mode, and whether the second inlet and outlet pipe temperature difference of the multifunctional vapor-liquid separator in the air-conditioning operating parameter is less than the preset temperature difference is determined at a second preset period, wherein the multifunctional vapor-liquid separator uses part of the second refrigerant to perform heat exchange processing with the first refrigerant in the second cooling mode; When the second inlet and outlet pipe temperature difference is less than the preset temperature difference, maintaining the second cooling mode as the target operation mode; or, When the temperature difference between the second inlet and outlet pipes is greater than or equal to the preset temperature difference, the target operating mode is switched from the second refrigeration mode to the third refrigeration mode, wherein the multifunctional vapor-liquid separator does not perform heat exchange processing between the second refrigerant and the first refrigerant in the third refrigeration mode.

4. The method according to claim 3, characterized in that When the target operation mode is the preset heat exchange mode, controlling the multifunctional vapor-liquid separator to perform heat exchange processing on the first refrigerant provided by the evaporator and the second refrigerant provided by the condenser includes: When the target operating mode is the first cooling mode or the second cooling mode, the multifunctional vapor-liquid separator is controlled to perform heat exchange processing on the first refrigerant provided by the indoor unit heat exchanger and the second refrigerant provided by the outdoor unit heat exchanger, wherein the preset heat exchange mode is the first cooling mode or the second cooling mode, the indoor unit heat exchanger in the air-conditioning system acts as an evaporator in the cooling mode, and the outdoor unit heat exchanger in the air-conditioning system acts as a condenser in the cooling mode.

5. The method according to claim 1, wherein The determining of the target operating mode according to the outdoor ambient temperature and the air-conditioning operating parameters includes: When the current operating mode in the air-conditioning operating parameters is the heating mode and the outdoor ambient temperature is less than or equal to the second preset temperature, the first heating mode is determined as the target operating mode, wherein the multifunctional vapor-liquid separator utilizes all of the second refrigerant to perform heat exchange processing with the first refrigerant in the first heating mode; or When the outdoor ambient temperature is greater than a second preset temperature, determining the first heating mode as the target operating mode, and periodically determining whether the first defrost times within the third preset period are less than a preset number according to a third preset period, wherein the air conditioning operating parameters also include the first defrost times; When the first defrosting number is less than the preset number, the first heating mode is maintained as the target operation mode.

6. The method according to claim 5, characterized in that When the outdoor ambient temperature is greater than a second preset temperature, the first heating mode is determined as the target operating mode, and after periodically determining whether the first defrost times within the third preset period are less than a preset times according to a third preset period, the method further includes: When the first defrost number is greater than or equal to the preset number, the target operating mode is switched from the first heating mode to the second heating mode, and whether the second defrost number in the fourth preset period is less than the preset number is determined according to a fourth preset period, wherein the multifunctional vapor-liquid separator uses part of the second refrigerant to perform heat exchange processing with the first refrigerant in the second heating mode; When the second defrosting number is less than the preset number, maintaining the second heating mode as the target operation mode; or, When the second defrost number is greater than or equal to the preset number, the target operating mode is switched from the second heating mode to the third heating mode, wherein the multifunctional vapor-liquid separator does not perform heat exchange processing between the second refrigerant and the first refrigerant in the third heating mode.

7. The method according to claim 6, characterized in that When the target operation mode is the preset heat exchange mode, controlling the multifunctional vapor-liquid separator to perform heat exchange processing on the first refrigerant provided by the evaporator and the second refrigerant provided by the condenser includes: When the target operating mode is the first heating mode or the second heating mode, the multifunctional vapor-liquid separator is controlled to perform heat exchange processing on the first refrigerant provided by the outdoor unit heat exchanger and the second refrigerant provided by the indoor unit heat exchanger, wherein the preset heat exchange mode is the first heating mode or the second heating mode, the outdoor unit heat exchanger in the air-conditioning system acts as an evaporator in the heating mode, and the indoor unit heat exchanger in the air-conditioning system acts as a condenser in the heating mode.

8. An air conditioning control device, characterized in that: The device comprises: an acquisition module for acquiring outdoor ambient temperature and air conditioning operating parameters, wherein the air conditioning system includes a multifunctional vapor-liquid separator, an indoor unit heat exchanger, an outdoor unit heat exchanger, an electronic expansion valve, a four-way valve, and a compressor; the electronic expansion valve includes an outdoor unit electronic expansion valve and an indoor unit electronic expansion valve; the multifunctional vapor-liquid separator includes a vapor-liquid separator body and a capillary tube; the inlet of the vapor-liquid separator body is connected to the four-way valve; the outlet of the vapor-liquid separator body is connected to the compressor; the capillary tube is provided at the inner bottom of the vapor-liquid separator body; liquid separator heads are provided at both ends of the capillary tube; a first end of the capillary tube is connected to the indoor unit electronic expansion valve; a second end of the capillary tube is connected to a first solenoid valve provided outside the vapor-liquid separator body; the first solenoid valve is also connected to the outdoor unit electronic expansion valve; The indoor unit heat exchanger is used to serve as an evaporator to provide a first refrigerant to the multifunctional vapor-liquid separator in cooling mode, and to serve as a condenser to provide a second refrigerant to the multifunctional vapor-liquid separator in heating mode. The outdoor unit heat exchanger is used to serve as a condenser to provide the second refrigerant to the multifunctional vapor-liquid separator in cooling mode, and to serve as an evaporator to provide the first refrigerant to the multifunctional vapor-liquid separator in heating mode. In cooling mode, the outdoor unit heat exchanger sequentially transfers the second refrigerant through the outdoor unit electronic expansion valve, the first solenoid valve, the capillary tube, the indoor unit electronic expansion valve, the indoor unit heat exchanger, and the four-way valve to the vapor-liquid separator body for heat exchange. In heating mode, the indoor unit heat exchanger sequentially transfers the second refrigerant through the indoor unit electronic expansion valve, the capillary tube, the first solenoid valve, the outdoor unit electronic expansion valve, the outdoor unit heat exchanger, and the four-way valve to the vapor-liquid separator body for heat exchange. a determination module, configured to determine a target operating mode according to the outdoor ambient temperature and the air conditioning operating parameters; The control module is used to control the multifunctional vapor-liquid separator to perform heat exchange processing on the first refrigerant provided by the evaporator and the second refrigerant provided by the condenser when the target operating mode is a preset heat exchange mode, wherein the temperature of the first refrigerant is lower than the temperature of the second refrigerant.

9. An air conditioning system, characterized in that: For implementing the air conditioning control method according to claim 1, the air conditioning system comprises: The indoor unit heat exchanger is configured to serve as an evaporator in cooling mode to provide a first refrigerant to the multifunctional vapor-liquid separator, and as a condenser in heating mode to provide a second refrigerant to the multifunctional vapor-liquid separator, wherein the temperature of the first refrigerant is lower than that of the second refrigerant; The outdoor unit heat exchanger is configured to serve as a condenser in cooling mode to provide the second refrigerant to the multifunctional vapor-liquid separator, and to serve as an evaporator in heating mode to provide the first refrigerant to the multifunctional vapor-liquid separator; The multifunctional vapor-liquid separator is respectively connected to the indoor unit heat exchanger, the outdoor unit heat exchanger, the four-way valve, and the compressor, and is used to perform heat exchange processing on the first refrigerant provided by the evaporator and the second refrigerant provided by the condenser, and transfer the gaseous refrigerant after heat exchange to the compressor; The compressor is connected to the indoor heat exchanger and the outdoor heat exchanger through a four-way valve, and is used to compress the gaseous refrigerant in the cooling mode or the heating mode to achieve cooling or heating; an indoor unit electronic expansion valve, connected to the indoor unit heat exchanger and the multifunctional vapor-liquid separator, respectively, for throttling and reducing the pressure of the second refrigerant into a liquid first refrigerant in a cooling mode, so that the liquid first refrigerant enters the indoor unit heat exchanger and evaporates into a gaseous first refrigerant; an outdoor unit electronic expansion valve, connected to the outdoor unit heat exchanger and the multifunctional vapor-liquid separator, respectively, for throttling and reducing the pressure of the second refrigerant into a liquid first refrigerant in a heating mode, so that the liquid first refrigerant enters the outdoor unit heat exchanger and evaporates into a gaseous first refrigerant; The multifunctional vapor-liquid separator includes a vapor-liquid separator body and a capillary tube. The pipe inlet of the vapor-liquid separator body is connected to the four-way valve, and the pipe outlet of the vapor-liquid separator body is connected to the compressor. The capillary tube is arranged at the bottom of the vapor-liquid separator body, and liquid separation heads are respectively provided at both ends of the capillary tube. The first end of the capillary tube is connected to the indoor unit electronic expansion valve, and the second end of the capillary tube is connected to the first solenoid valve arranged outside the vapor-liquid separator body. The first solenoid valve is also connected to the outdoor unit electronic expansion valve.

10. The air conditioning system according to claim 9, characterized in that The air conditioning system also includes a second solenoid valve, a first end of the second solenoid valve is respectively connected to the first solenoid valve and the outdoor unit electronic expansion valve, and a second end of the solenoid valve is respectively connected to the first end of the capillary tube and the indoor unit electronic expansion valve.

11. The air conditioning system according to claim 10, characterized in that The outlet and inlet of the vapor-liquid separator body are respectively provided with a temperature sensor for collecting the inlet and outlet temperatures of the vapor-liquid separator.

12. The air conditioning system according to claim 10, characterized in that The air conditioning system further includes an injection enthalpy component, which is respectively connected to the first solenoid valve, the second solenoid valve, the outdoor unit electronic expansion valve, and the compressor, and is used to perform injection enthalpy increase processing on the compressor.

13. The air conditioning system according to claim 12, characterized in that The enthalpy spray component includes a subcooler, a subcooling electronic expansion valve, and a enthalpy spray electronic expansion valve. The subcooling electronic expansion valve is respectively connected to the first solenoid valve, the second solenoid valve, and the subcooler. The subcooler is connected to the outdoor unit heat exchanger through the outdoor unit electronic expansion valve. The subcooler is also connected to the compressor through the enthalpy spray electronic expansion valve.

14. The air conditioning system according to claim 13, wherein: The air conditioning system further includes a third solenoid valve, a first end of the third solenoid valve being respectively connected to the spray enthalpy electronic expansion valve and the subcooler, and a second end of the third solenoid valve being connected to the vapor-liquid separator body.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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