Air conditioning system and control method thereof

Abstract

The embodiment of the present application provides an air conditioning system and a control method thereof, relates to the technical field of air conditioning, and is used for prolonging the heating period of the air conditioning system. The air conditioning system comprises: a first outdoor heat exchanger located on a windward surface and a second outdoor heat exchanger away from the windward surface; an outdoor fan; when the air conditioning system is in a first heating defrosting mode, the indoor heat exchanger works as a condenser, the first outdoor heat exchanger works as an evaporator, the second outdoor heat exchanger works as a condenser, and the outdoor fan rotates in a first direction to make air after heat exchange with the second outdoor heat exchanger pass through the first outdoor heat exchanger; when the air conditioning system is in a second heating defrosting mode, the indoor heat exchanger works as a condenser, the first outdoor heat exchanger works as a condenser, the second outdoor heat exchanger works as an evaporator, and the outdoor fan rotates in a second direction to make air after heat exchange with the first outdoor heat exchanger pass through the second outdoor heat exchanger.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, and particularly relates to an air conditioning system and a control method thereof. BACKGROUND

[0002] With the development of economic society, the air conditioning system is more and more widely used in entertainment, home and work and other places.

[0003] Generally, when the air conditioner is in the heating mode, if the temperature of the environment where the outdoor unit of the air conditioning system is located is too low to cause the outdoor unit to frost, the air conditioning system needs to stop the heating mode and perform defrosting work on the outdoor unit. If the air conditioning system frequently performs defrosting work on the outdoor unit, the heating cycle of the air conditioning system will be short, thereby affecting the user experience. SUMMARY

[0004] The embodiments of the present application provide an air conditioning system and a control method thereof, which are used for prolonging the heating cycle of the air conditioning system.

[0005] In order to achieve the above purpose, the technical scheme is adopted as follows.

[0006] In a first aspect, the embodiments of the present application provide an air conditioning system, which comprises: a compressor; an indoor heat exchanger; an outdoor heat exchanger, comprising a first outdoor heat exchanger located on the windward side and a second outdoor heat exchanger away from the windward side; an outdoor fan; when the air conditioning system is in a first heating defrosting mode, the indoor heat exchanger works as a condenser, the first outdoor heat exchanger works as an evaporator, and the second outdoor heat exchanger works as a condenser, and the outdoor fan rotates in a first direction to make the air after heat exchange with the second outdoor heat exchanger pass through the first outdoor heat exchanger; or when the air conditioning system is in a second heating defrosting mode, the indoor heat exchanger works as a condenser, the first outdoor heat exchanger works as a condenser, and the second outdoor heat exchanger works as an evaporator, and the outdoor fan rotates in a second direction to make the air after heat exchange with the first outdoor heat exchanger pass through the second outdoor heat exchanger, and the second direction is opposite to the first direction.

[0007] The technical scheme provided by the embodiments of the present application at least brings the following beneficial effects: the air conditioning system provided by the embodiments of the present application divides the outdoor heat exchanger into the first outdoor heat exchanger located on the windward surface and the second outdoor heat exchanger away from the windward surface (may also be referred to as the leeward surface). When the air conditioning system is in the first heating defrosting mode, the first outdoor heat exchanger continues to work as an evaporator, that is, continues to heat the space where the indoor heat exchanger is located. The second outdoor heat exchanger works as a condenser to generate condensation heat, and then the outdoor fan is controlled to rotate in the first direction, so that the air after heat exchange with the second outdoor heat exchanger can pass through the first outdoor heat exchanger to transfer heat to the first outdoor heat exchanger, so as to increase the temperature around the first outdoor heat exchanger, realize defrosting of the second outdoor heat exchanger while delaying the frosting time of the first outdoor heat exchanger, prolong the time of the first outdoor heat exchanger working as an evaporator, that is, realize the extension of the heating cycle of the air conditioning system, which is helpful to improve the user experience.

[0008] Similarly, when the air conditioning system is in the second heating defrosting mode, the second outdoor heat exchanger works as an evaporator, that is, the second outdoor heat exchanger continues to heat the space where the indoor heat exchanger is located. The first outdoor heat exchanger works as a condenser to generate condensation heat, and then the outdoor fan is controlled to rotate in the second direction, so that the air after heat exchange with the first outdoor heat exchanger can pass through the second outdoor heat exchanger to transfer heat to the second outdoor heat exchanger, so as to increase the temperature around the second outdoor heat exchanger, realize defrosting of the first outdoor heat exchanger while delaying the frosting time of the second outdoor heat exchanger, prolong the time of the second outdoor heat exchanger working as an evaporator, that is, realize the extension of the heating cycle of the air conditioning system, which is helpful to improve the user experience.

[0009] In some embodiments, the compressor includes a first compressor and a second compressor; the air conditioning system further includes: a first valve assembly, the first valve assembly is connected with the exhaust port and the suction port of the first compressor and the first end of the first outdoor heat exchanger respectively, and the first valve assembly is used to control the flow direction of the refrigerant flowing into the first outdoor heat exchanger, so that the first outdoor heat exchanger works as an evaporator or a condenser; a second valve assembly, the second valve assembly is connected with the exhaust port and the suction port of the second compressor and the first end of the second outdoor heat exchanger respectively, and the second valve assembly is used to control the flow direction of the refrigerant flowing into the second outdoor heat exchanger, so that the second outdoor heat exchanger works as an evaporator or a condenser.

[0010] In some embodiments, when the air conditioning system is in the heating mode, the indoor heat exchanger works as a condenser, the first outdoor heat exchanger works as an evaporator, and the second outdoor heat exchanger works as an evaporator; when the air conditioning system is in the cooling mode, the indoor heat exchanger works as an evaporator, the first outdoor heat exchanger works as a condenser, and the second outdoor heat exchanger works as a condenser.

[0011] In some embodiments, the air conditioning system further comprises a controller configured to: control the air conditioning system to switch from the heating mode to a first heating defrosting mode when a first defrosting condition is met; control the air conditioning system to switch from the first heating defrosting mode to a second heating defrosting mode when a second defrosting condition is met; and control the air conditioning system to switch from the second heating defrosting mode to the heating mode when a defrosting end condition is met.

[0012] In some embodiments, the controller is further configured to: control the first compressor to work at a first frequency when the air conditioning system is in the heating mode, so that the coil temperature value of the first outdoor heat exchanger is greater than the frosting temperature.

[0013] In some embodiments, the air conditioning system further comprises a second temperature sensor arranged on the second outdoor heat exchanger and configured to detect the coil temperature value of the second outdoor heat exchanger; and the controller is further configured to: obtain the coil temperature value of the second outdoor heat exchanger through the second temperature sensor after controlling the first compressor to work at the first frequency; control the first compressor to work at a second frequency when the coil temperature value of the second outdoor heat exchanger is detected to be less than or equal to the frosting temperature; and the second frequency is greater than the first frequency.

[0014] In some embodiments, the outdoor heat exchanger comprises a plurality of rows of heat exchange pipes arranged in sequence along a direction perpendicular to the windward surface, and the plurality of rows of heat exchange pipes comprise first heat exchange pipes and second heat exchange pipes, the first heat exchange pipes form the first outdoor heat exchanger, and the second heat exchange pipes form the second outdoor heat exchanger.

[0015] In some embodiments, the plurality of rows of heat exchange pipes further comprise third heat exchange pipes, the third heat exchange pipes are located between the first heat exchange pipes and the second heat exchange pipes, the third heat exchange pipes have first portions and second portions, the first portions form the first outdoor heat exchanger together with the first heat exchange pipes, and the second portions form the second outdoor heat exchanger together with the second heat exchange pipes.

[0016] In the second aspect, the embodiments of the present application provide a control method of an air conditioning system, the method being applied to the air conditioning system of the first aspect, and the method comprising: controlling the air conditioning system to switch from the heating mode to a first heating defrosting mode when a first defrosting condition is met; controlling the air conditioning system to switch from the first heating defrosting mode to a second heating defrosting mode when a second defrosting condition is met; and controlling the air conditioning system to switch from the second heating defrosting mode to the heating mode when a defrosting end condition is met.

[0017] In some embodiments, the method further comprises: controlling the first compressor to operate at the first frequency so that the coil temperature value of the first outdoor heat exchanger is greater than the frost temperature when the air conditioning system is in the heating mode.

[0018] In some embodiments, after controlling the first compressor to operate at the first frequency, the method further comprises: obtaining a coil temperature value of the second outdoor heat exchanger; controlling the first compressor to operate at a second frequency when it is detected that the coil temperature value of the second outdoor heat exchanger is less than or equal to the frost temperature; the second frequency is greater than the first frequency.

[0019] In a third aspect, the embodiments of the present application provide a controller, comprising: one or more processors; one or more memories; wherein the one or more memories are configured to store computer program codes, the computer program codes comprising computer instructions, when the one or more processors execute the computer instructions, the controller executes any one of the control methods of the air conditioning system provided in the second aspect.

[0020] In a fourth aspect, the embodiments of the present application provide a computer readable storage medium, the computer readable storage medium comprising computer instructions, when the computer instructions are run on a computer, the computer instructions cause the computer to execute any one of the control methods of the air conditioning system provided in the second aspect.

[0021] In a fifth aspect, the embodiments of the present application provide a computer program product, the computer program product can be directly loaded into a memory and contains software codes, the computer program product, when loaded and executed by a computer, can realize any one of the control methods of the air conditioning system provided in the second aspect.

[0022] It should be noted that the above computer instructions can be stored on the computer readable storage medium in whole or in part. The computer readable storage medium can be packaged together with the processor of the controller, or packaged separately from the processor of the controller, and the present application does not limit the computer readable storage medium.

[0023] The beneficial effects of the second aspect to the fifth aspect of the present application are described above, which can be referred to the beneficial effects of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are included to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solutions of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0025] Figure 1 A related technical heat exchanger partitioning schematic diagram provided by the embodiments of the present application;

[0026] Figure 2 A related technical single-fan heat exchanger composition schematic diagram provided for the embodiments of the present application;

[0027] Figure 3 A structure schematic diagram of an air conditioning system provided for the embodiments of the present application;

[0028] Figure 4 A structure schematic diagram of another air conditioning system provided for the embodiments of the present application;

[0029] Figure 5 A structure schematic diagram of another air conditioning system provided for the embodiments of the present application;

[0030] Figure 6 A structure schematic diagram of another air conditioning system provided for the embodiments of the present application;

[0031] Figure 7 A hardware configuration block diagram of an air conditioning system provided for the embodiments of the present application;

[0032] Figure 8 A flow schematic diagram of a control method of an air conditioning system provided for the embodiments of the present application;

[0033] Figure 9 A flow schematic diagram of a control method of another air conditioning system provided for the embodiments of the present application;

[0034] Figure 10 A flow schematic diagram of a control method of another air conditioning system provided for the embodiments of the present application;

[0035] Figure 11 A flow schematic diagram of a control method of another air conditioning system provided for the embodiments of the present application;

[0036] Figure 12 A heat exchanger partitioning schematic diagram provided for the embodiments of the present application;

[0037] Figure 13 Another heat exchanger partitioning schematic diagram provided for the embodiments of the present application;

[0038] Figure 14 Another heat exchanger partitioning schematic diagram provided for the embodiments of the present application;

[0039] Figure 15 Another heat exchanger partitioning schematic diagram provided for the embodiments of the present application;

[0040] Figure 16 Another heat exchanger partitioning schematic diagram provided for the embodiments of the present application;

[0041] Figure 17 A hardware structure schematic diagram of a controller provided for the embodiments of the present application. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0043] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0044] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0045] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, when describing the pipeline, the "connected" and "connected" used in the present application have the meaning of conducting. The specific meaning needs to be understood in combination with the context.

[0046] In order to realize uninterrupted heating of the air conditioning system, the traditional scheme is to divide the heat exchanger, that is, half of the heat exchanger is defrosted, and the other half of the heat exchanger continues to heat, and then the defrosting is performed in turn. For large commercial outdoor units with two fans and two heat exchangers, such as Figure 1 The above division scheme is easy to implement. However, for models with only one heat exchanger and one fan, the above division scheme cannot be implemented.

[0047] As shown in Figure 2As shown, the uninterrupted heating scheme of the single fan in the related art divides the heat exchanger into upper and lower zones, but this scheme blows air from the top and the fan is at the top of the frame. When one of the heat exchangers is defrosted, the fan must stop, and the other heat exchanger has no air available, which is equivalent to the entire air conditioning system having no evaporator available, so uninterrupted heating cannot be achieved.

[0048] Based on this, the embodiment of the present application provides an air conditioning system. By dividing the outdoor heat exchanger into a first outdoor heat exchanger located on the windward side and a second outdoor heat exchanger away from the windward side (also referred to as the leeward side), the outdoor fan is controlled to rotate in different directions under different conditions, so that the air after heat exchange with the outdoor heat exchanger as a condenser can pass through the outdoor heat exchanger as an evaporator, so as to improve the temperature around the outdoor heat exchanger as an evaporator, delay the frosting time of the outdoor heat exchanger as an evaporator, prolong the heating time of the space where the indoor unit is located by the outdoor heat exchanger as an evaporator, and prolong the heating period of the air conditioning system. And control the air conditioning system to enter different defrosting modes under different defrosting conditions to ensure that the air conditioning system can continuously heat, achieving uninterrupted heating of the air conditioning system.

[0049] Figure 3 A structural schematic diagram of an air conditioning system according to an exemplary embodiment of the present application is provided. It should be noted that the air conditioning system involved in the embodiment of the present application can be a general air conditioning system composed of one indoor unit and one outdoor unit, or a multi-split air conditioning system commonly known as a multi-split air conditioning system. In order to facilitate description, different types of air conditioning systems are all taken as Figure 1 The structural schematic diagram of the air conditioning system is taken as an example for illustration.

[0050] As Figure 3 shown, the air conditioning system 100 includes a first compressor 1, a second compressor 2, a first valve assembly 3, a second valve assembly 4, an indoor unit 5, a first throttling device 6, a second throttling device 7, an outdoor heat exchanger 8, a first gas-liquid separator 9, a second gas-liquid separator 10, a plurality of electromagnetic valves (such as a first electromagnetic valve 11, a second electromagnetic valve 12, a third electromagnetic valve 13, and a fourth electromagnetic valve 14), and a controller 15. Among them, the outdoor unit 5 includes a third throttling device 51, and the outdoor heat exchanger 8 includes a first outdoor heat exchanger 81 and a second outdoor heat exchanger 82. It should be noted that in the embodiment of the present application, the sequential connection only illustrates the sequential relationship between the various devices, and other devices can also be included between the various devices, which is not limited in the embodiment of the present application.

[0051] In some embodiments, the first compressor 1 and the second compressor 2 are used to provide power for the air conditioning system 100.

[0052] In some embodiments, the first compressor 1 is configured to compress the refrigerant delivered by the first gas-liquid separator 9 and deliver the compressed refrigerant to the first outdoor heat exchanger 81 via the first valve assembly 3. The first compressor 1 can be an inverter compressor with variable capacity based on inverter-based speed control.

[0053] In some embodiments, the second compressor 2 is configured to compress the refrigerant delivered by the second gas-liquid separator 10 and deliver the compressed refrigerant to the second outdoor heat exchanger 82 via the second valve assembly 4. The second compressor 2 can be an inverter compressor with variable capacity based on inverter-based speed control.

[0054] In some embodiments, the first valve assembly 3 is connected to the discharge port and the suction port of the first compressor 1 and the first end of the first outdoor heat exchanger 81, respectively. The first valve assembly 3 is configured to control the flow direction of the refrigerant flowing into the first outdoor heat exchanger 81 so that the first outdoor heat exchanger 81 works as an evaporator or a condenser. The refrigerant can be a refrigerant.

[0055] In some embodiments, the second valve assembly 4 is connected to the discharge port and the suction port of the second compressor 2 and the first end of the second outdoor heat exchanger 82, respectively. The second valve assembly 4 is configured to control the flow direction of the refrigerant flowing into the second outdoor heat exchanger 82 so that the second outdoor heat exchanger 82 works as an evaporator or a condenser.

[0056] In some embodiments, the conductive state between the interfaces of the first valve assembly 3 and the second valve assembly 4 is different in different cases. For example Figure 3 As shown, when the first valve assembly 3 is in the OFF state and the second valve assembly 4 is in the OFF state, the C / D interface and the S / E interface of the first valve assembly 3 are conductive, and the C / D interface and the S / E interface of the second valve assembly 4 are conductive.

[0057] For another example Figure 4 As shown, when the first valve assembly 3 is in the ON state and the second valve assembly 4 is in the ON state, the D / E interface and the S / C interface of the first valve assembly 3 are conductive, and the D / E interface and the S / C interface of the second valve assembly 4 are conductive.

[0058] For another example Figure 5 As shown, when the first valve assembly 3 is in the OFF state and the second valve assembly 4 is in the ON state, the C / D interface and the S / E interface of the first valve assembly 3 are conductive, and the D / E interface and the S / C interface of the second valve assembly 4 are conductive.

[0059] For another example Figure 6As shown, when the first valve assembly 3 is in the ON state and the second valve assembly 4 is in the OFF state, the D / E interface of the first valve assembly 3 is in conduction, the S / C interface of the first valve assembly 3 is in conduction, the C / D interface of the second valve assembly 4 is in conduction, and the S / E interface of the second valve assembly 4 is in conduction.

[0060] In some embodiments, the first valve assembly 3 and the second valve assembly 4 can be four-way valves. For ease of description, the following embodiments are described by taking the first valve assembly 3 and the second valve assembly 4 as four-way valves.

[0061] In some embodiments, the first end of the indoor unit 5 is connected to the first valve assembly 3 and the second valve assembly 4, and the second end of the indoor unit 5 is connected to the second end of the outdoor heat exchanger 8.

[0062] In some embodiments, the indoor unit 5 includes a third throttling device 51, an indoor heat exchanger 52, and an indoor fan 53.

[0063] In some embodiments, the third throttling device 51 is an electronic expansion valve.

[0064] In some embodiments, the indoor heat exchanger 52 has a first inlet and outlet for passing liquid refrigerant between the third throttling device 51, and has a second inlet and outlet for passing gaseous refrigerant between the discharge outlets of the compressors 1 and 2. The indoor heat exchanger 52 exchanges heat between the refrigerant flowing in the heat transfer pipe connected between the first inlet and outlet and the indoor air.

[0065] In some embodiments, the indoor fan 53 generates an air flow of the indoor air through the indoor heat exchanger 52 to facilitate heat exchange between the refrigerant flowing in the heat transfer pipe between the first inlet and outlet and the indoor air.

[0066] In some embodiments, the air conditioning system 100 can include a plurality of indoor units 5. For ease of description, the embodiments of the present application are described by taking the air conditioning system 100 to include one indoor unit 5, but this does not mean that the air conditioning system 100 includes only one indoor unit 5.

[0067] In some embodiments, the first throttling device 6 is arranged on the pipeline between the second outdoor heat exchanger 82 and the indoor unit 5, and the second throttling device 7 is arranged on the pipeline between the first outdoor heat exchanger 81 and the indoor unit 5.

[0068] In some embodiments, the first throttling device 6 and the second throttling device 7 are both electronic expansion valves.

[0069] In some embodiments, the opening range of the first throttling device 6 and the second throttling device 7 is 0-500 pls.

[0070] In some embodiments, the electronic expansion valve has a function of expanding and depressurizing refrigerant flowing therethrough, and can be used to adjust the amount of refrigerant supplied in the pipe. If the opening degree of the electronic expansion valve is reduced, the flow path resistance of the refrigerant passing through the electronic expansion valve increases. If the opening degree of the electronic expansion valve is increased, the flow path resistance of the refrigerant passing through the electronic expansion valve decreases. In this way, even if the states of other devices in the circuit do not change, when the opening degree of the electronic expansion valve changes, the refrigerant flow to the indoor unit 5 also changes.

[0071] In some embodiments, the outdoor heat exchanger 8 includes a first outdoor heat exchanger 81, a second outdoor heat exchanger 82, and an outdoor fan 83.

[0072] In some embodiments, the first end of the first outdoor heat exchanger 81 is connected to the first gas-liquid separator 9 through the first valve assembly 3, and the second end is connected to the indoor unit 5. The first outdoor heat exchanger 81 has a first inlet and outlet for allowing refrigerant to pass between the first outdoor heat exchanger 81 and the suction port of the compressor 1 via the first gas-liquid separator 9, and has a second inlet and outlet for allowing refrigerant to pass between the first outdoor heat exchanger 81 and the first throttling device 6. The first outdoor heat exchanger 81 exchanges heat between the heat transfer tubes connected between the first inlet and outlet and the outdoor air.

[0073] In some embodiments, the first end of the second outdoor heat exchanger 82 is connected to the second gas-liquid separator 10 through the second valve assembly 4, and the second end is connected to the indoor unit 5. The second outdoor heat exchanger 82 has a first inlet and outlet for allowing refrigerant to pass between the second outdoor heat exchanger 82 and the suction port of the compressor 2 via the second gas-liquid separator 10, and has a second inlet and outlet for allowing refrigerant to pass between the second outdoor heat exchanger 82 and the second throttling device 7. The second outdoor heat exchanger 82 exchanges heat between the heat transfer tubes connected between the first inlet and outlet and the outdoor air.

[0074] In some embodiments, when the air conditioning system 100 is in the heating mode, the indoor heat exchanger 52 works as a condenser, the first outdoor heat exchanger 81 works as an evaporator, and the second outdoor heat exchanger 82 works as an evaporator.

[0075] In some embodiments, when the air conditioning system 100 is in the cooling mode, the indoor heat exchanger 52 works as an evaporator, the first outdoor heat exchanger 81 works as a condenser, and the second outdoor heat exchanger 82 works as a condenser.

[0076] In some embodiments, the first solenoid valve 11, the second solenoid valve 12, the third solenoid valve 13, and the fourth solenoid valve 14 each have only two states of ON and OFF.

[0077] The air conditioning system in the present application performs a refrigeration cycle of the air conditioning system by using a compressor, a condenser, an electronic expansion valve, an evaporator, and a four-way valve as a refrigerant circulation loop. Taking the refrigeration cycle of the air conditioning system as an example, the refrigeration cycle of the air conditioning system includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been adjusted and heat-exchanged.

[0078] The compressor compresses refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0079] The electronic expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the electronic expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by heat-exchanging with a material to be cooled using the latent heat of evaporation of the refrigerant. Throughout the cycle, the air conditioning system can adjust the temperature of the indoor space.

[0080] In some embodiments of the present application, the air conditioning system can implement multiple operating modes, specifically, can include the following cases:

[0081] Case 1, the air conditioning system 100 is in a cooling mode.

[0082] When the air conditioning system 100 is in the cooling mode, the two compressors can operate at different frequencies, and then the first outdoor heat exchanger 81 and the second outdoor heat exchanger 82 can have different discharge pressures, so that the condensing pressures of the first outdoor heat exchanger 81 and the second outdoor heat exchanger 82 are different, which can make the outdoor heat exchanger as best as possible.

[0083] As described above Figure 3 When the air conditioning system 100 is in the cooling mode, the first valve assembly 3 and the second valve assembly 4 are both in the OFF state, the first electromagnetic valve 11 and the second electromagnetic valve 12 are in the ON state, the third electromagnetic valve 13 and the fourth electromagnetic valve 14 are in the OFF state, and the flow process of the refrigerant is:

[0084] 1→3→81→7→5→3→11→9→1.

[0085] 2→4→82→6→5→4→12→10→2.

[0086] Case 2, the air conditioning system 100 is in a small load cooling mode.

[0087] When the indoor unit 5 includes multiple indoor units and only part of the multiple indoor units are in the cooling mode, it is called a small load cooling mode. If both compressors or both outdoor heat exchangers are fully opened at this time, the size ratio of the indoor heat exchangers of the indoor units in the running state in the multiple indoor units will be unbalanced, the energy efficiency of the running is low, and the reliability of the air conditioning system 100 is not high. At this time, half of the compressors or half of the outdoor heat exchangers can be opened. For details, see the above Figure 3 , which can specifically include the following several operating modes:

[0088] (1) The compressor 1 is opened, and the first outdoor heat exchanger 81 is running.

[0089] The opening degree of the first throttling device is adjusted to a preset opening degree, for example, 40 pls, the opening degree of the second throttling device is adjusted to the maximum opening degree 500 pls, the second compressor 2 is not opened, the first electromagnetic valve 11 is opened, and the second electromagnetic valve 12, the third electromagnetic valve 13 and the fourth electromagnetic valve 14 are closed.

[0090] (2) The compressor 1 is opened, and the first outdoor heat exchanger 81 and the second outdoor heat exchanger 82 are running.

[0091] The opening degree of the first throttling device 6 and the second throttling device 7 is adjusted to the maximum opening degree, the second compressor 2 is not running, the first electromagnetic valve 11 and the fourth electromagnetic valve 14 are opened, and the second electromagnetic valve 12 and the third electromagnetic valve 13 are closed.

[0092] (3) The compressor 2 is opened, and the second outdoor heat exchanger 81 is running.

[0093] The opening degree of the second throttling device 7 is adjusted to a preset opening degree, for example, 40 pls, the opening degree of the first throttling device 6 is adjusted to the maximum opening degree 500 pls, the first compressor 1 is not running, the second electromagnetic valve 12 is opened, and the first electromagnetic valve 11, the third electromagnetic valve 13 and the fourth electromagnetic valve 14 are closed.

[0094] (4) The compressor 2 is opened, and the first outdoor heat exchanger 81 and the second outdoor heat exchanger 82 are running.

[0095] The opening degree of the first throttling device 6 and the second throttling device 7 is adjusted to the maximum opening degree 500 pls, the first compressor 1 is not running, the first electromagnetic valve 11 and the third electromagnetic valve 13 are closed, and the second electromagnetic valve 12 and the fourth electromagnetic valve 14 are opened.

[0096] Case 3, the air conditioning system 100 is in the heating mode.

[0097] When the air conditioning system 100 is in the heating mode, it can specifically include the following several operating modes:

[0098] (1) The first outdoor heat exchanger 81 is defrosted as a condenser.

[0099] In this mode, the second outdoor heat exchanger 82 continues to act as an evaporator, thereby realizing uninterrupted heating of the air conditioning system 100. Referring to Figure 5 , the first solenoid valve 11 and the fourth solenoid valve 14 are closed, the second solenoid valve 12 and the third solenoid valve 13 are opened, and the flow path of the refrigerant is:

[0100] 1→3→81→7→6→82→4→12→13→9→1.

[0101] 2→4→5→6→82→4→12→10→2.

[0102] (2) The second outdoor heat exchanger 82 acts as a condenser to defrost.

[0103] In this mode, the first outdoor heat exchanger 81 acts as an evaporator, thereby realizing uninterrupted heating of the air conditioning system 100. Referring to Figure 6 , the second solenoid valve 12 and the fourth solenoid valve 14 are closed, the first solenoid valve 11 and the third solenoid valve 13 are opened, and the flow path of the refrigerant is:

[0104] 1→3→5→7→81→3→11→9→1.

[0105] 2→4→82→6→7→81→3→11→13→10→2.

[0106] Case 4, the air conditioning system 100 is in a small load heating mode.

[0107] When the indoor unit 5 includes multiple indoor units and only some of the multiple indoor units are in a heating mode, it is referred to as a small load heating mode. As described in the above case 2, if both compressors or both outdoor heat exchangers are fully opened at this time, the indoor heat exchangers of the indoor units in operation will be out of balance in size, the energy efficiency will be low, and the reliability of the air conditioning system 100 will not be high. At this time, half of the compressors or half of the outdoor heat exchangers can be opened,

[0108] Referring to Figure 4 , this mode can include the following operating modes:

[0109] (1) The first compressor 1 is opened, and the first outdoor heat exchanger 81 is operated.

[0110] The opening degree of the first throttling device 6 is adjusted to the minimum opening degree 0pls, the second compressor 2 is not operated, the second outdoor heat exchanger 82 is not operated, the first solenoid valve 11 is opened, and the second solenoid valve 12, the third solenoid valve 13, and the fourth solenoid valve 14 are closed.

[0111] (2) The first compressor 1 is opened, and the first outdoor heat exchanger 81 and the second outdoor heat exchanger 82 are both operated.

[0112] The second compressor 2 is closed, the first electromagnetic valve 11 and the fourth electromagnetic valve 14 are opened, and the second electromagnetic valve 12 and the third electromagnetic valve 13 are closed.

[0113] (3) The second compressor 2 is opened, and the second outdoor heat exchanger 82 operates.

[0114] The first compressor 1 is closed, the first outdoor heat exchanger 81 does not operate, the opening degree of the second throttling device 7 is adjusted to the minimum opening degree 0 pls, the second electromagnetic valve 12 is opened, and the first electromagnetic valve 11, the third electromagnetic valve 13 and the fourth electromagnetic valve 14 are closed.

[0115] (4) The second compressor 2 is opened, and the first outdoor heat exchanger 81 and the second outdoor heat exchanger 82 both operate.

[0116] The first compressor 1 is closed, the second electromagnetic valve 12 and the fourth electromagnetic valve 14 are opened, and the first electromagnetic valve 11 and the third electromagnetic valve 13 are closed.

[0117] In some embodiments, the air conditioning system 100 comprises a first heating defrosting mode and a second heating defrosting mode. When the air conditioning system 100 is in the first heating defrosting mode, the indoor heat exchanger 52 works as a condenser, the first outdoor heat exchanger 81 works as an evaporator, the second outdoor heat exchanger 82 works as a condenser, and the outdoor fan 83 rotates in a first direction so that the air after heat exchange with the second outdoor heat exchanger 82 passes through the first outdoor heat exchanger 81.

[0118] In some embodiments, when the air conditioning system 100 is in the second heating defrosting mode, the indoor heat exchanger 52 works as a condenser, the first outdoor heat exchanger 81 works as a condenser, the second outdoor heat exchanger 82 works as an evaporator, and the outdoor fan 83 rotates in a second direction so that the air after heat exchange with the first outdoor heat exchanger 81 passes through the second outdoor heat exchanger 82.

[0119] Wherein, the first direction and the second direction are opposite, for example, the first direction is clockwise, and the second direction is counterclockwise; or, the first direction is counterclockwise, and the second direction is clockwise.

[0120] It can be understood that when the air conditioning system 100 is in the second heating defrosting mode, that is, the first outdoor heat exchanger 81 is in the frosting state, the first outdoor heat exchanger 81 can be used as a condenser to work to produce condensing heat to defrost. During the defrosting process of the first outdoor heat exchanger 81 as a condenser, the outdoor fan 83 rotates in the second direction so that the air after heat exchange with the first outdoor heat exchanger 82 can pass through the second outdoor heat exchanger 82 to increase the temperature around the second outdoor heat exchanger 82, delay the frosting time of the second outdoor heat exchanger 82, and prolong the time of the second outdoor heat exchanger 82 as an evaporator, that is, prolong the heating period of the air conditioning system 100.

[0121] In the embodiments shown in the present application, the controller 15 refers to a device that can generate operation control signals according to instruction operation codes and timing signals to instruct the air conditioning system to execute control instructions. For example, the controller can be a central processing unit (CPU), a general processor network processor (NP), a digital signal processing (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The controller can also be other devices with processing functions, such as circuits, devices, or software modules, and the embodiments of the present application do not make any limitation thereto.

[0122] In addition, the controller 15 can be used to control the operation of each component in the air conditioning system 100, so that each component of the air conditioning system 100 operates to achieve the predetermined functions of the air conditioning system.

[0123] In some embodiments, the controller 15 can be integrated in the outdoor unit, that is, the outdoor unit can control the operation of each component in the air conditioning system 100.

[0124] In some embodiments, the air conditioning system 100 also has a remote controller which has the function of communicating with the controller 15, for example, using infrared or other communication methods. The remote controller is used for the user to control various controls of the air conditioning system, to realize the interaction between the user and the air conditioning system 100.

[0125] Figure 7 The hardware configuration block diagram of the air conditioning system 100 provided by the exemplary embodiments of the present application is shown. As shown in the figure, Figure 7 The air conditioning system 100 can also include one or more of the following: a first temperature sensor 201, a second temperature sensor 202, a third temperature sensor 203, a pressure sensor 204, a communicator 205, and a memory 206.

[0126] In some embodiments, the first temperature sensor 201 is connected to the controller 15, and the first temperature sensor 201 is arranged on the liquid pipe of the first outdoor heat exchanger 81 to detect the evaporation temperature value when the first outdoor heat exchanger 81 is used as an evaporator.

[0127] In some embodiments, the second temperature sensor 202 is connected to the controller 15, and the second temperature sensor 202 is arranged on the liquid pipe of the second outdoor heat exchanger 82 to detect the evaporation temperature value when the second outdoor heat exchanger 82 is used as an evaporator.

[0128] In some embodiments, the third temperature sensor 203 is connected to the controller 15, and the third temperature sensor 203 is arranged on the shell of the outdoor unit to detect the outdoor ambient temperature value where the outdoor unit is located.

[0129] In some embodiments, the pressure sensor 204 is connected to the controller 15, and the pressure sensor 204 is arranged on the first outdoor heat exchanger 81 to detect the evaporation pressure value when the first outdoor heat exchanger 81 is used as an evaporator.

[0130] In some embodiments, the communicator 205 is electrically connected to the controller 15 to establish a communication connection with other network entities, such as a terminal device. The communicator 205 can include a radio frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, and a GPS module, etc. Taking the RF module as an example, the RF module can be used for receiving and sending signals, in particular, sending the received information to the controller 15 for processing, and sending the signals generated by the controller 15. Generally, the RF circuit can include but is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, etc.

[0131] The memory 206 can be used to store software programs and data. The controller 15 executes various functions of the air conditioning system 100 and data processing by running the software programs or data stored in the memory 206. The memory 206 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state memory device. The memory 206 stores an operating system that enables the air conditioning system 100 to operate. In this application, the memory 206 can store an operating system and various application programs, and can also store codes for executing the control method of the air conditioning system provided in the embodiments of the application.

[0132] Those skilled in the art can understand that, Figure 7The hardware structure shown does not constitute a limitation on the air conditioning system. The air conditioning system may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0133] The embodiments provided in this application will now be described in detail with reference to the accompanying drawings.

[0134] like Figure 8 As shown in the figure, this application provides a control method for an air conditioning system. The method is applied to the controller 15 in the air conditioning system 100, and includes the following steps:

[0135] S101. When the first defrosting condition is met, control the air conditioning system to switch from heating mode to the first heating defrosting mode.

[0136] In some embodiments, when the air conditioning system is in heating mode, both the first outdoor heat exchanger and the second outdoor heat exchanger operate as evaporators. The controller detects the evaporation temperature of the first outdoor heat exchanger in real time through a first temperature sensor, the evaporation temperature of the second outdoor heat exchanger in real time through a second temperature sensor, and the outdoor ambient temperature of the outdoor unit in real time through a third temperature sensor, so as to know in real time whether the air conditioning system meets the first defrosting condition. When the first defrosting condition is met, the controller promptly controls the air conditioning system to switch from heating mode to the first heating defrosting mode, thereby ensuring uninterrupted heating of the air conditioning system.

[0137] It should be noted that when the air conditioning system is in heating mode, the evaporation temperature of the first outdoor heat exchanger will be higher than that of the second outdoor heat exchanger. This means the second outdoor heat exchanger will frost before the first. This can be understood as the air conditioning system meeting the first defrosting condition before meeting the second defrosting condition. For a description of why the second outdoor heat exchanger frosts before the first, please refer to the description of step S201 below; it will not be repeated here.

[0138] The first defrosting condition satisfies one or more of the following formulas:

[0139] T a ≤a, and T e1 ≤b*(c*T a -d) Formula (1)

[0140] Among them, T a The outdoor ambient temperature value of the environment where the outdoor unit is located, T e1 The evaporation temperature value is the second outdoor heat exchanger when it is used as an evaporator. a, b, c and d are all constants, for example, a is -2, b is 1 / 26, c is 15 and d is 480.

[0141] e≤T a, and T e1 ≤f, equation (2)

[0142] wherein e and f are both constants, for example, e is 7 and f is -5.

[0143] a < T a < e, and T e1 ≤ g*(h*T a -i), equation (3)

[0144] wherein g, h and i are both constants, for example, g is 1 / 8, h is 16 and i is 50.

[0145] T a ≤ a, and T e1 ≤ g*(j*T a -k), equation (4)

[0146] wherein j and k are both constants, for example, j is 25 and k is 30.

[0147] As can be understood from the above description of the first heating defrosting mode, when the air conditioning system is in the first heating defrosting mode, the indoor heat exchanger works as a condenser, the first outdoor heat exchanger works as an evaporator, the second outdoor heat exchanger works as a condenser, and the outdoor fan rotates in the first direction so that the air after heat exchange with the second outdoor heat exchanger passes through the first outdoor heat exchanger.

[0148] As can be understood, when the first defrosting condition is met, that is, the second outdoor heat exchanger is in a frosting state, the second outdoor heat exchanger can be switched from an evaporator to a condenser to work to generate condensation heat to defrost the second outdoor heat exchanger, and the first outdoor heat exchanger can continue to work as an evaporator, that is, continue to heat the indoor environment, realizing uninterrupted heating of the air conditioning system. During the defrosting of the second outdoor heat exchanger as a condenser, the outdoor fan rotates in the first direction so that the air after heat exchange with the second outdoor heat exchanger can pass through the first outdoor heat exchanger to increase the temperature around the first outdoor heat exchanger and delay the frosting time of the first outdoor heat exchanger, thereby prolonging the time of the first outdoor heat exchanger as an evaporator, that is, realizing the extension of the heating period of the air conditioning system.

[0149] S102, when the second defrosting condition is met, switching the air conditioning system from the first heating defrosting mode to the second heating defrosting mode.

[0150] wherein the second defrosting condition meets one or more of the following formulas:

[0151] T a ≤ a, and T e2 ≤ b*(c*T ad) Formula (5)

[0152] wherein T e2 is the evaporating temperature value of the second outdoor heat exchanger as an evaporator.

[0153] e≤T a , and T e2 ≤f Formula (6)

[0154] a<T a <e, and T e2 ≤g*(h*T a i) Formula (7)

[0155] T a ≤a, and T e2 ≤g*(J*T a k) Formula (8)

[0156] As can be understood from the above description of the second heating defrosting mode, when the air conditioning system is in the second heating defrosting mode, the indoor heat exchanger works as a condenser, the first outdoor heat exchanger works as a condenser, the second outdoor heat exchanger works as an evaporator, and the outdoor fan rotates in the second direction so that the air after heat exchange with the first outdoor heat exchanger passes through the second outdoor heat exchanger.

[0157] As can be understood, when the second defrosting condition is met, that is, the first outdoor heat exchanger is in a frosting state, the first outdoor heat exchanger can be switched from an evaporator to a condenser to work to generate condensing heat to defrost the first outdoor heat exchanger, and the second outdoor heat exchanger is switched from a condenser to an evaporator to heat the indoor environment. During the defrosting process of the first outdoor heat exchanger as a condenser, the outdoor fan rotates in the second direction so that the air after heat exchange with the first outdoor heat exchanger can pass through the second outdoor heat exchanger to increase the temperature around the second outdoor heat exchanger, delay the frosting time of the second outdoor heat exchanger, and thus prolong the time for the second outdoor heat exchanger to heat the indoor environment as an evaporator, thereby prolonging the heating cycle of the air conditioning system.

[0158] S103, when the defrosting end condition is met, switching the air conditioning system from the second heating defrosting mode to the heating mode.

[0159] In some embodiments, the defrosting end condition includes that the evaporating temperature value of the second outdoor heat exchanger is greater than or equal to a preset temperature threshold.

[0160] The preset temperature threshold can be preset when the air conditioning system is manufactured, or can be set by a user through a remote controller of the air conditioning system. For example, the preset temperature threshold is 15 DEG C. That is, when the evaporating temperature value of the second outdoor heat exchanger is greater than or equal to 15 DEG C, it is determined that the first outdoor heat exchanger and the second outdoor heat exchanger are both not frosted, and the controller can control the air conditioning system to switch from the second heating defrosting mode to the heating mode, so that the first outdoor heat exchanger and the second outdoor heat exchanger both serve as evaporators to heat the indoor environment, thereby improving the heating effect of the air conditioning system.

[0161] In some embodiments, as shown in FIG. 1, the method further includes the following steps: Figure 9

[0162] S201, when the air conditioning system is in the heating mode, the first compressor is controlled to work at a first frequency, so that the coil temperature value of the first outdoor heat exchanger is greater than the frosting temperature.

[0163] As described above in the heating mode, the first outdoor heat exchanger works as an evaporator. As described above in the first compressor, the first compressor is connected with the first outdoor heat exchanger, so the evaporation pressure of the first outdoor heat exchanger as an evaporator is related to the operating frequency of the first compressor.

[0164] It can be understood that the first outdoor heat exchanger is located on the windward side, and the wind passes through the first outdoor heat exchanger before reaching the second outdoor heat exchanger. In the case that the surface temperature value of the first outdoor heat exchanger is greater than 0 DEG C, the first outdoor heat exchanger can function as a dehumidifier, but the first outdoor heat exchanger does not frost. In this case, after the first outdoor heat exchanger dehumidifies the wind, the humidity of the incoming air of the second outdoor heat exchanger decreases relatively, thereby reducing the frosting speed of the second outdoor heat exchanger, that is, prolonging the time for the second outdoor heat exchanger to work as an evaporator, thus realizing the extension of the heating cycle of the air conditioning system.

[0165] Based on this, when the air conditioning system is in the heating mode, the controller can control the first compressor to work at a first frequency, so that the evaporation pressure of the first outdoor heat exchanger is above 0.8 MPa (corresponding to the saturation temperature of the refrigerant 0.25 DEG C), so that the coil temperature value of the first outdoor heat exchanger is greater than the frosting temperature.

[0166] The first frequency can be preset when the air conditioning system is manufactured, or can be calculated in real time by the controller according to the frosting temperature and the current coil temperature value of the first outdoor heat exchanger. The frosting temperature value can be preset when the air conditioning system is manufactured, for example, the frosting temperature is 0 DEG C.

[0167] ​In some embodiments, while the controller controls the first compressor to work at the first frequency, the controller controls the second compressor to work at a third frequency, so that the evaporation pressure of the second outdoor heat exchanger is between 0.7 MPa and 0.75 MPa. The third frequency is greater than the first frequency, and the third frequency can be pre-set when the air conditioning system is manufactured, or can be calculated in real time by the controller in combination with the first frequency and the frosting temperature.

[0168] As can be seen from the above description of the refrigeration mode, the first compressor and the second compressor can work at different frequencies. When the air conditioning system is in the heating mode, since the first compressor is controlled to work at the first frequency, the frosting time of the second outdoor heat exchanger can be delayed, that is, the time for the second outdoor heat exchanger to work as an evaporator to heat the indoor environment is prolonged. Therefore, while the controller controls the first compressor to work at the first frequency, the controller controls the second compressor to work at the third frequency, that is, controls the second compressor to work at a high frequency, so as to improve the heating effect of the second outdoor heat exchanger as an evaporator, that is, to improve the heating effect of the air conditioning system.

[0169] In addition, since the first compressor is controlled to work at the first frequency while the second compressor is controlled to work at the third frequency, the first outdoor heat exchanger located on the windward side and the second outdoor heat exchanger located away from the windward side have the same frosting speed and the frost layer is uniformly distributed, which can delay the effect of frost blocking, prolong the time for the first outdoor heat exchanger and the second outdoor heat exchanger to work as evaporators, and prolong the heating cycle of the air conditioning system.

[0170] In some embodiments, as shown in FIG. 2, after step S201, the method further includes the following steps: Figure 10

[0171] S301, obtaining a coil temperature value of the second outdoor heat exchanger.

[0172] It can be understood that after the controller controls the first compressor to work at the first frequency to prolong the frosting time of the second outdoor heat exchanger, the second outdoor heat exchanger will still frost. In order to know whether the second outdoor heat exchanger will frost in time, the controller can obtain the coil temperature value of the second outdoor heat exchanger in real time through the second temperature sensor.

[0173] S302, when it is detected that the coil temperature value of the second outdoor heat exchanger is less than or equal to the frosting temperature, controlling the first compressor to work at a second frequency.

[0174] The second frequency is greater than the first frequency, that is, when it is detected that the coil temperature value of the second outdoor heat exchanger is less than or equal to the frosting temperature, the frequency of the first compressor is increased.

[0175] ​It can be understood that when the coil temperature value of the second outdoor heat exchanger is detected to be less than or equal to the frost formation temperature value, it means that the second outdoor heat exchanger will be frosted. Based on this, the operating frequency of the first compressor is increased so that the first outdoor heat exchanger is frosted first. In this way, the humidity of the incoming air of the second outdoor heat exchanger is further reduced, the frost formation time of the second outdoor heat exchanger is further prolonged, the defrosting frequency is reduced, the time for the second outdoor heat exchanger to act as an evaporator to heat the indoor environment is prolonged, that is, the heating cycle of the air conditioning system is prolonged, and the user's use experience is improved.

[0176] In some embodiments, as shown in FIG. 1, before step S201, the method further includes the following steps: Figure 11

[0177] S401, obtaining an evaporation pressure value of the first outdoor heat exchanger.

[0178] In some embodiments, when the air conditioning system is in the heating mode, in order to detect whether the heating effect of the first outdoor heat exchanger meets the user's demand, the controller can obtain the evaporation pressure value of the first outdoor heat exchanger when it acts as an evaporator in real time through the pressure sensor.

[0179] S402, increasing the frequency of the first compressor when it is detected that the evaporation pressure value of the first outdoor heat exchanger is greater than a preset pressure threshold value.

[0180] It can be understood that if the evaporation pressure value of the first outdoor heat exchanger is greater than the preset pressure threshold value, it means that the current evaporation pressure value of the first outdoor heat exchanger is too high, that is, the heating effect of the first outdoor heat exchanger on the indoor environment is poor. Based on this, in order to make the heating effect of the first outdoor heat exchanger on the indoor environment meet the user's demand, the frequency of the first compressor can be controlled to reduce the evaporation pressure value of the first outdoor heat exchanger.

[0181] The preset pressure threshold value can be preset when the air conditioning system is manufactured, for example, the preset pressure threshold value is 0.8 MPa.

[0182] S403, decreasing the frequency of the first compressor when it is detected that the evaporation pressure value of the first outdoor heat exchanger is less than or equal to the preset pressure threshold value.

[0183] It can be understood that if the evaporation pressure value of the first outdoor heat exchanger is less than or equal to the preset pressure threshold value, it means that the current evaporation pressure value of the first outdoor heat exchanger is too low and is prone to frosting. Based on this, in order to make the first outdoor heat exchanger have the function of a dehumidifier to prolong the time for the second outdoor heat exchanger to act as an evaporator, the frequency of the first compressor can be controlled to increase the evaporation pressure value of the first outdoor heat exchanger.

[0184] ​In some embodiments, after the controller controls the first compressor to increase or decrease the frequency, the controller can again acquire the evaporating pressure value of the first outdoor heat exchanger through the pressure sensor. If it is detected that the evaporating pressure value of the first outdoor heat exchanger is within the preset pressure interval range, the first compressor is controlled to work at the current frequency. If it is detected that the evaporating pressure value of the first outdoor heat exchanger is not within the preset pressure interval range, the above step S402 or step S403 is executed again.

[0185] The preset pressure interval range can be preset when the air conditioning system is shipped, for example, the preset pressure interval range is (0.8-0.05, 0.8+0.05).

[0186] In some embodiments, the control method of the air conditioning system provided by the embodiments of the present application further includes a zoning method for the outdoor heat exchanger, which is specifically described as follows.

[0187] From the above description of the outdoor heat exchanger, it can be seen that the outdoor heat exchanger includes the first outdoor heat exchanger located on the windward side and the second outdoor heat exchanger away from the windward side.

[0188] In some embodiments, the outdoor heat exchanger includes multiple rows of heat exchange pipes, the multiple rows of heat exchange pipes are arranged in sequence along a direction perpendicular to the windward side, and the multiple rows of heat exchange pipes include first heat exchange pipes and second heat exchange pipes. The first heat exchange pipes constitute the first outdoor heat exchanger, and the second heat exchange pipes constitute the second outdoor heat exchanger.

[0189] For example, as shown in FIG. 2, when the outdoor heat exchanger includes two rows of heat exchange pipes, Figure 12 the right heat exchange pipes in the middle are the first heat exchange pipes, Figure 12 the left heat exchange pipes in the middle are the second heat exchange pipes. That is, Figure 12 the right heat exchange pipes in the middle are the first outdoor heat exchanger, Figure 12 the left heat exchange pipes in the middle are the second outdoor heat exchanger. Figure 12

[0190] It should be noted that the number of the first heat exchange pipes and the second heat exchange pipes is not limited in the embodiments of the present application. For example, as shown in FIG. 3(a), Figure 13

[0191] In some embodiments, the multiple rows of heat exchange pipes further include third heat exchange pipes, the third heat exchange pipes are located between the first heat exchange pipes and the second heat exchange pipes, the third heat exchange pipes and the first heat exchange pipes constitute the first outdoor heat exchanger, or the third heat exchange pipes and the second heat exchange pipes constitute the second outdoor heat exchanger.

[0192] For example, when the outdoor heat exchanger includes three rows of heat exchange pipes, the right heat exchange pipes are the first heat exchange pipes, the left heat exchange pipes are the second heat exchange pipes, and the middle row of heat exchange pipes are the third heat exchange pipes. For example, as shown in FIG. 3(b), Figure 13 ​​As shown in (a) of FIG. 1, the first heat exchange tube and the third heat exchange tube constitute the first outdoor heat exchanger, and the second heat exchange tube constitutes the second outdoor heat exchanger. Alternatively, as shown in (b) of FIG. 1, the first heat exchange tube constitutes the first outdoor heat exchanger, and the third heat exchange tube and the second heat exchange tube constitute the second outdoor heat exchanger. Figure 13 As shown in (a) of FIG. 1, the first heat exchange tube and the third heat exchange tube constitute the first outdoor heat exchanger, and the second heat exchange tube constitutes the second outdoor heat exchanger. Alternatively, as shown in (b) of FIG. 1, the first heat exchange tube constitutes the first outdoor heat exchanger, and the third heat exchange tube and the second heat exchange tube constitute the second outdoor heat exchanger.

[0193] As shown in (a) of FIG. 1, the first heat exchange tube and the third heat exchange tube constitute the first outdoor heat exchanger, and the second heat exchange tube constitutes the second outdoor heat exchanger. Alternatively, as shown in (b) of FIG. 1, the first heat exchange tube constitutes the first outdoor heat exchanger, and the third heat exchange tube and the second heat exchange tube constitute the second outdoor heat exchanger. Figure 14 As shown in (a) of FIG. 1, the first heat exchange tube and the third heat exchange tube constitute the first outdoor heat exchanger, and the second heat exchange tube constitutes the second outdoor heat exchanger. Alternatively, as shown in (b) of FIG. 1, the first heat exchange tube constitutes the first outdoor heat exchanger, and the third heat exchange tube and the second heat exchange tube constitute the second outdoor heat exchanger. Figure 14 As shown in (a) of FIG. 1, the first heat exchange tube and the third heat exchange tube constitute the first outdoor heat exchanger, and the second heat exchange tube constitutes the second outdoor heat exchanger. Alternatively, as shown in (b) of FIG. 1, the first heat exchange tube constitutes the first outdoor heat exchanger, and the third heat exchange tube and the second heat exchange tube constitute the second outdoor heat exchanger.

[0194] As shown in (a) of FIG. 1, the first heat exchange tube and the third heat exchange tube constitute the first outdoor heat exchanger, and the second heat exchange tube constitutes the second outdoor heat exchanger. Alternatively, as shown in (b) of FIG. 1, the first heat exchange tube constitutes the first outdoor heat exchanger, and the third heat exchange tube and the second heat exchange tube constitute the second outdoor heat exchanger.

[0195] As shown in (a) of FIG. 1, the first heat exchange tube and the third heat exchange tube constitute the first outdoor heat exchanger, and the second heat exchange tube constitutes the second outdoor heat exchanger. Alternatively, as shown in (b) of FIG. 1, the first heat exchange tube constitutes the first outdoor heat exchanger, and the third heat exchange tube and the second heat exchange tube constitute the second outdoor heat exchanger. Figure 15 As shown in (a) of FIG. 1, the first heat exchange tube and the third heat exchange tube constitute the first outdoor heat exchanger, and the second heat exchange tube constitutes the second outdoor heat exchanger. Alternatively, as shown in (b) of FIG. 1, the first heat exchange tube constitutes the first outdoor heat exchanger, and the third heat exchange tube and the second heat exchange tube constitute the second outdoor heat exchanger. Figure 15 As shown in (a) of FIG. 1, the first heat exchange tube and the third heat exchange tube constitute the first outdoor heat exchanger, and the second heat exchange tube constitutes the second outdoor heat exchanger. Alternatively, as shown in (b) of FIG. 1, the first heat exchange tube constitutes the first outdoor heat exchanger, and the third heat exchange tube and the second heat exchange tube constitute the second outdoor heat exchanger.

[0196] As shown in (a) of FIG. 1, the first heat exchange tube and the third heat exchange tube constitute the first outdoor heat exchanger, and the second heat exchange tube constitutes the second outdoor heat exchanger. Alternatively, as shown in (b) of FIG. 1, the first heat exchange tube constitutes the first outdoor heat exchanger, and the third heat exchange tube and the second heat exchange tube constitute the second outdoor heat exchanger. Figure 16 As shown in (a) of FIG. 1, the first heat exchange tube and the third heat exchange tube constitute the first outdoor heat exchanger, and the second heat exchange tube constitutes the second outdoor heat exchanger. Alternatively, as shown in (b) of FIG. 1, the first heat exchange tube constitutes the first outdoor heat exchanger, and the third heat exchange tube and the second heat exchange tube constitute the second outdoor heat exchanger.

[0197] As shown in (a) of FIG. 1, the first heat exchange tube and the third heat exchange tube constitute the first outdoor heat exchanger, and the second heat exchange tube constitutes the second outdoor heat exchanger. Alternatively, as shown in (b) of FIG. 1, the first heat exchange tube constitutes the first outdoor heat exchanger, and the third heat exchange tube and the second heat exchange tube constitute the second outdoor heat exchanger. Figure 16As shown in (b) of FIG. 1, the first part of the third heat exchange tube and the first heat exchange tube constitute a first outdoor heat exchanger, and the second part of the third heat exchange tube and the second heat exchange tube constitute a second outdoor heat exchanger. Alternatively, as shown in (c) of FIG. 1, the second part of the third heat exchange tube and the first heat exchange tube constitute a first outdoor heat exchanger, and the first part of the third heat exchange tube and the second heat exchange tube constitute a second outdoor heat exchanger. Figure 16 As shown in (b) of FIG. 1, the first part of the third heat exchange tube and the first heat exchange tube constitute a first outdoor heat exchanger, and the second part of the third heat exchange tube and the second heat exchange tube constitute a second outdoor heat exchanger. Alternatively, as shown in (c) of FIG. 1, the second part of the third heat exchange tube and the first heat exchange tube constitute a first outdoor heat exchanger, and the first part of the third heat exchange tube and the second heat exchange tube constitute a second outdoor heat exchanger.

[0198] It should be noted that when the outdoor heat exchanger includes 3 rows of heat exchange tubes, in the case that the air conditioning system focuses on the refrigeration capacity, preferably Figure 13 As shown in (a) of FIG. 1, and Figure 15 As shown in (a) of FIG. 1, in the case that the air conditioning system focuses on the heating capacity, preferably Figure 13 As shown in (b) of FIG. 1, and Figure 15 As shown in (b) of FIG. 1.

[0199] When the outdoor heat exchanger includes 4 rows of heat exchange tubes, in the case that the air conditioning system focuses on the refrigeration capacity, preferably Figure 14 As shown in (a) of FIG. 1, and secondly Figure 16 As shown in (b) of FIG. 1. In the case that the air conditioning system focuses on the heating capacity, preferably Figure 14 As shown in (b) of FIG. 1, and Figure 16 As shown in (c) of FIG. 1.

[0200] It should be understood that the number of heat exchange tubes shown in the figures is only exemplary, and the embodiments of the present application do not limit the number of each heat exchange tube of the first heat exchange tube, the second heat exchange tube and the third heat exchange tube.

[0201] It can be seen that the above mainly introduces the scheme provided by the embodiments of the present application from the perspective of method. In order to realize the above functions, the embodiments of the present application provide corresponding hardware structures and / or software modules for executing various functions. Those skilled in the art should easily realize that the modules and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain function is realized in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0202] The embodiments of the present application can divide the functions of the controller according to the above method examples, for example, each function module can be divided according to each function, or two or more functions can be integrated in one processing module. The above integrated module can be realized in the form of hardware or software function module. Optionally, the division of the modules in the embodiments of the present application is illustrative, and is only a logical function division. In actual implementation, there can be another division method.

[0203] The embodiment of the present application further provides a hardware structure diagram of a controller, as shown in the figure, the controller 3000 comprises a processor 3001, and optionally further comprises a memory 3002 and a communication interface 3003 connected with the processor 3001. The processor 3001, the memory 3002 and the communication interface 3003 are connected through a bus 3004. Figure 17

[0204] The processor 3001 can be a central processing unit (CPU), a general processor network processor (NP), a digital signal processing (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD) or any combination thereof. The processor 3001 can also be any other device with processing function, such as a circuit, a device or a software module. The processor 3001 can also comprise a plurality of CPUs, and the processor 3001 can be a single-CPU processor or a multi-CPU processor. The processor herein can refer to one or more devices, circuits or processing cores for processing data (for example, computer program instructions).

[0205] The memory 3002 can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, a magneto-optical disk, a magnetic disk storage or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and capable of being accessed by a computer, and the embodiment of the present application does not make any limitation thereto. The memory 3002 can exist independently or be integrated with the processor 3001. The memory 3002 can contain computer program code. The processor 3001 is used to execute the computer program code stored in the memory 3002, so as to realize the control method of the air conditioning system provided by the embodiment of the present application.​

[0206] The communication interface 3003 can be used to communicate with other devices or communication networks (e.g., Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.). The communication interface 3003 can be a module, a circuit, a transceiver, or any device capable of enabling communication.

[0207] The bus 3004 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus 3004 can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 17 Only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0208] The embodiment of the present application further provides a computer readable storage medium, which comprises computer execution instructions, and when the computer execution instructions run on a computer, the computer execution instructions make the computer execute the control method of the air conditioning system provided by the above embodiment.

[0209] The embodiment of the present application further provides a computer program product, which can be directly loaded into a memory and contains software codes, and the computer program product can realize the control method of the air conditioning system provided by the above embodiment after being loaded and executed by a computer.

[0210] Those skilled in the art should be aware that, in one or more examples described above, the functions described by the present application can be implemented in hardware, software, firmware or any combination thereof. When implemented in software, the functions can be stored in a computer readable medium or transmitted as one or more instructions or codes on a computer readable medium. The computer readable medium includes computer storage medium and communication medium, wherein the communication medium includes any medium that facilitates transfer of a computer program from one place to another. The storage medium can be any available medium accessible by a general or special purpose computer.

[0211] Through the above description of the embodiments, those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional modules is taken as an example for illustration, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0212] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other manners. For example, the division of the apparatus embodiments is merely an example, and for example, the division of the modules or units can be different, and each module or unit can be integrated into another module or unit, or some features can be ignored, or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0213] In addition, each function unit in the various embodiments of the present application can be integrated into a processing unit, or each unit can exist physically independently, or two or more units can be integrated into one unit. The integrated unit can be implemented in the form of hardware, or in the form of a software function unit. When the integrated unit is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on such an understanding, the technical solutions of the embodiments of the present application essentially, or the part that contributes to the prior art, or all or a part of the technical solutions can be embodied in the form of a software product. The software product is stored in a storage medium, and includes several instructions for causing an apparatus (which can be a single chip, a chip, or the like) or a processor to perform all or a part of the steps of the methods described in the various embodiments of the present application. The foregoing storage medium includes: U disk, mobile hard disk, ROM, RAM, magnetic disk, or optical disk, and the like, and various storage media that can store program codes.

[0214] The above describes only the specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An air conditioning system, characterized in that, include: compressor; The compressor includes: a first compressor; Indoor heat exchanger; An outdoor heat exchanger includes a first outdoor heat exchanger located on the windward side and a second outdoor heat exchanger located away from the windward side. The outdoor heat exchanger includes multiple rows of heat exchange tubes arranged sequentially along a direction perpendicular to the windward side. The multiple rows of heat exchange tubes include a first heat exchange tube and a second heat exchange tube. The first heat exchange tubes form the first outdoor heat exchanger, and the second heat exchange tubes form the second outdoor heat exchanger. Outdoor fan; When the air conditioning system is in the first heating and defrosting mode, the indoor heat exchanger operates as a condenser, the first outdoor heat exchanger operates as an evaporator, and the second outdoor heat exchanger operates as a condenser. The outdoor fan rotates in a first direction so that the air that has exchanged heat with the second outdoor heat exchanger passes through the first outdoor heat exchanger; or... When the air conditioning system is in the second heating and defrosting mode, the indoor heat exchanger works as a condenser, the first outdoor heat exchanger works as a condenser, the second outdoor heat exchanger works as an evaporator, and the outdoor fan rotates in a second direction so that the air that has exchanged heat with the first outdoor heat exchanger passes through the second outdoor heat exchanger. The second direction is opposite to the first direction. The controller is configured as follows: When the air conditioning system is in heating mode, the first compressor is controlled to operate at a first frequency so that the coil temperature of the first outdoor heat exchanger is greater than the frosting temperature. After controlling the first compressor to operate at a first frequency, the coil temperature value of the second outdoor heat exchanger is obtained through the second temperature sensor; When the coil temperature of the second outdoor heat exchanger is detected to be less than or equal to the frosting temperature, the first compressor is controlled to operate at a second frequency; the second frequency is greater than the first frequency.

2. The air conditioning system according to claim 1, characterized in that, The compressor also includes a second compressor; The air conditioning system also includes: The first valve assembly is connected to the exhaust port and suction port of the first compressor and the first end of the first outdoor heat exchanger, respectively. The first valve assembly is used to control the flow direction of the refrigerant flowing into the first outdoor heat exchanger so that the first outdoor heat exchanger can work as an evaporator or a condenser. The second valve assembly is connected to the exhaust port and suction port of the second compressor and the first end of the second outdoor heat exchanger, respectively. The second valve assembly is used to control the flow direction of the refrigerant flowing into the second outdoor heat exchanger so that the second outdoor heat exchanger can work as an evaporator or a condenser.

3. The air conditioning system according to claim 2, characterized in that, When the air conditioning system is in heating mode, the indoor heat exchanger functions as a condenser, the first outdoor heat exchanger functions as an evaporator, and the second outdoor heat exchanger functions as an evaporator. When the air conditioning system is in cooling mode, the indoor heat exchanger functions as an evaporator, the first outdoor heat exchanger functions as a condenser, and the second outdoor heat exchanger functions as a condenser.

4. The air conditioning system according to claim 3, characterized in that, The air conditioning system also includes: The controller is configured as follows: When the first defrosting condition is met, the air conditioning system is controlled to switch from the heating mode to the first heating defrosting mode; When the second defrosting condition is met, the air conditioning system is controlled to switch from the first heating defrosting mode to the second heating defrosting mode; When the defrosting end conditions are met, the air conditioning system is controlled to switch from the second heating defrosting mode to the heating mode.

5. The air conditioning system according to claim 4, characterized in that, The multi-row heat exchange tubes also include a third heat exchange tube, which is located between the first heat exchange tube and the second heat exchange tube. The third heat exchange tube has a first part and a second part. The first part and the first heat exchange tube form the first outdoor heat exchanger, and the second part and the second heat exchange tube form the second outdoor heat exchanger.

6. A control method for an air conditioning system, characterized in that, The method, applied to the air conditioning system according to any one of claims 1 to 5, comprises: When the first defrosting condition is met, the air conditioning system is controlled to switch from heating mode to the first heating defrosting mode; When the second defrosting condition is met, the air conditioning system is controlled to switch from the first heating defrosting mode to the second heating defrosting mode. When the defrosting end conditions are met, the air conditioning system is controlled to switch from the second heating defrosting mode to the heating mode.

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