Air conditioning system

Abstract

The application provides an air conditioner system, which belongs to the technical field of air conditioners, and comprises a first flow regulating valve, a second flow regulating valve, and a refrigerant radiator. The opening degree of the first flow regulating valve is adjustable, and the opening degree of the second flow regulating valve is adjustable. The refrigerant radiator is used for dissipating heat of an outdoor control module and has a first working state and a second working state. When the refrigerant radiator is in the first working state, a first port of the refrigerant radiator is communicated with a second end of the second flow regulating valve, and a second port of the refrigerant radiator is communicated with a second end of the first flow regulating valve. When the refrigerant radiator is in the second working state, the second end of the second flow regulating valve is communicated with the second end of the first flow regulating valve, the first port is communicated with a second end of a first throttling element, and the second port is communicated with an inlet of a gas-liquid separator or a gas supplementing port of a compressor. The temperature of the outdoor control module is prevented from being high, and the temperature of the outdoor control module is prevented from being low to cause condensation.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and more particularly to an air conditioning system. Background Technology

[0002] An air conditioning system includes a compressor, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger. In cooling mode, the outdoor heat exchanger acts as a condenser, and the indoor heat exchanger acts as an evaporator. In heating mode, the outdoor heat exchanger acts as an evaporator, and the indoor heat exchanger acts as a condenser. The refrigerant passes sequentially through the compressor, condenser, throttling device, and evaporator to form a refrigerant circuit.

[0003] In related technologies, a refrigerant radiator is installed in the air conditioning system. The refrigerant radiator is connected in the refrigerant circuit, and the refrigerant can flow through the refrigerant radiator to dissipate heat from the outdoor control module.

[0004] A refrigerant radiator is typically connected between the condenser and the expansion joint, and the condensed refrigerant dissipates heat to the outdoor control module. However, this can lead to problems such as excessively high outdoor control module temperature and condensation due to excessively low outdoor control module temperature. Therefore, this application proposes an air conditioning system. Summary of the Invention

[0005] This application provides an air conditioning system that can solve the technical problems of condensation caused by excessively high outdoor control module temperature and excessively low outdoor control module temperature.

[0006] In a first aspect, embodiments of this application provide an air conditioning system, including:

[0007] The outdoor unit includes a first reversing device, a compressor, an outdoor heat exchanger, an outdoor throttling device, and a liquid-side shut-off valve;

[0008] The first reversing device includes a first valve port, a second valve port, a third valve port, and a fourth valve port;

[0009] The compressor's air inlet is connected to the first valve port via a gas-liquid separator, and the compressor's exhaust port is connected to the third valve port.

[0010] The first end of the outdoor throttling device is connected to the second valve port through the outdoor heat exchanger.

[0011] The first end of the liquid-side shut-off valve is connected to the fourth valve port via an indoor heat exchanger.

[0012] The outdoor unit also includes:

[0013] First section of flow;

[0014] First flow control valve and second flow control valve;

[0015] Of the second end of the outdoor throttling device and the second end of the liquid-side shut-off valve, the first end of the first flow regulating valve and the first end of the second flow regulating valve are respectively connected to one of them, and the second end of the first flow regulating valve and the first end of the first throttling device are respectively connected to the other.

[0016] A refrigerant radiator is used to dissipate heat from the outdoor control module and has a first working state and a second working state.

[0017] When the refrigerant radiator is in the first working state, the first port of the refrigerant radiator is connected to the second end of the second flow regulating valve, and the second port of the refrigerant radiator is connected to the second end of the first flow regulating valve;

[0018] When the refrigerant radiator is in the second working state, the second end of the second flow regulating valve is connected to the second end of the first flow regulating valve, the first port is connected to the second end of the first throttling element, and the second port is connected to the inlet of the gas-liquid separator or the gas injection port of the compressor.

[0019] The refrigerant radiator is configured with a first operating state and a second operating state. The radiator's state can be selected based on the heat output of the outdoor control module. In the first operating state, the radiator utilizes the sensible heat of the refrigerant for cooling. In the second operating state, when there is a risk of overheating of the outdoor heat exchange module or condensation due to low outdoor temperature and high humidity, the radiator utilizes the latent heat of the refrigerant for cooling. In the second operating state, the refrigerant flow rate can be adjusted via a first throttling device. In the first operating state, the refrigerant flow rate can be adjusted via a first flow regulating valve and a second flow regulating valve. Both methods allow for refrigerant flow rate adjustment based on the heat output of the outdoor control module, preventing both overheating and condensation caused by low outdoor control module temperatures.

[0020] According to one embodiment of this application, it also includes:

[0021] The first temperature detection device is used to detect the outdoor ambient temperature Ta;

[0022] The controller is electrically connected to the first throttling element, the first flow regulating valve, the second flow regulating valve, and the first temperature detection device; the controller is configured to:

[0023] Upon receiving a start signal to start the outdoor unit, the opening degree EVB of the first throttling device is controlled to a%, and the first flow regulating valve and the second flow regulating valve are fully opened. Then, it is determined whether the outdoor ambient temperature Ta is greater than b.

[0024] When Ta>b, the refrigerant radiator is controlled to the second working state;

[0025] When Ta≤b, determine whether the air conditioning system has a subcooler;

[0026] When the air conditioning system does not have the subcooler, the opening degree of the first throttling element is controlled to zero, and then the refrigerant radiator is controlled to the first operating state; when the air conditioning system has the subcooler, the refrigerant radiator is controlled to the first operating state.

[0027] When the air conditioning system has a subcooler, the inlet of the auxiliary refrigerant pipe of the subcooler is connected to the second end of the first throttling element, and the auxiliary refrigerant pipe is connected in series with the first throttling element.

[0028] When the outdoor unit first starts up, the outdoor control module generates a significant amount of heat. When Ta > b, and the outdoor ambient temperature is relatively high, the refrigerant radiator is controlled in its second operating state. This utilizes the latent heat of the refrigerant to cool the outdoor control module, preventing it from overheating during startup. When Ta ≤ b, and the outdoor ambient temperature is relatively low, the refrigerant radiator is controlled in its first operating state. This utilizes the sensible heat of the refrigerant to cool the outdoor control module. This ensures that the refrigerant in the air conditioning system flows more towards the evaporator while maintaining a suitable temperature for the outdoor control module, thus guaranteeing the evaporator's heat exchange efficiency and improving the overall performance of the air conditioning system. Before switching the refrigerant radiator to its first operating state, it checks if a subcooler is present. If a subcooler is present, the opening of the first throttling element is not adjusted, allowing the subcooler to subcool the refrigerant. If there is no subcooler, the opening of the first throttling element is adjusted to zero, allowing more refrigerant to flow towards the evaporator, ensuring the evaporator's heat exchange efficiency.

[0029] According to one embodiment of this application, the controller is configured as follows:

[0030] When the refrigerant radiator is in the second working state, if EVB≤a%×β, or EVB>a%×β, EVB≤a%×α, and the duration of the opening degree of the first throttling element being less than or equal to a%×α is greater than or equal to τ, it is determined whether the air conditioning system has a subcooler.

[0031] When the air conditioning system does not have the subcooler, the opening of the first throttling element is controlled to be zero, and then the refrigerant radiator is controlled to be in the first working state.

[0032] When the air conditioning system has the subcooler, the refrigerant radiator is controlled to be in the first working state.

[0033] With the above settings, after the opening of the first throttling element is very small or the first throttling element is stable at a small opening for a certain period of time, the refrigerant radiator switches to the first working state, using the sensible heat of the refrigerant to cool the outdoor control module. Under the premise of ensuring that the outdoor control module temperature is suitable, more refrigerant in the air conditioning system can flow to the evaporator, ensuring the heat exchange effect of the evaporator and improving the overall performance of the air conditioning system.

[0034] According to one embodiment of this application, it also includes:

[0035] The second temperature detection device is used to detect the temperature Tfin of the outdoor control module and is electrically connected to the controller;

[0036] The controller is configured to:

[0037] When the refrigerant radiator is in the second working state, when EVB>a%×α, or when EVB>a%×β, EVB≤a%×α, and the duration of the opening degree of the first throttling device being less than or equal to a%×α is less than τ, it is determined whether the temperature Tfin of the outdoor control module is less than or equal to cd and whether the temperature Tfin of the outdoor control module is greater than the sum of the ambient dew point temperature Tdp and e.

[0038] When Tfin > cd, increase the opening of the first throttling element;

[0039] When Tfin≤cd and Tfin>Tdp+e, the opening degree of the first throttling element remains unchanged;

[0040] When Tfin≤cd and Tfin≤Tdp+e, reduce the opening of the first throttling element.

[0041] This design ensures that even when the outdoor control module is generating high heat and has a high potential for heat transfer, the refrigerant radiator remains in its second operating state. This utilizes the latent heat of the refrigerant to better cool the outdoor control module, improving its cooling effect. The system is configured to maintain the opening of the first throttling element when Tfin ≤ cd and Tfin > Tdp + e; increase the opening of the first throttling element when Tfin > cd; and decrease the opening of the first throttling element when Tfin ≤ cd and Tfin ≤ Tdp + e. This allows for adjustment of the first throttling element's opening based on the temperature at the outdoor control module, keeping the temperature within a suitable range and preventing both excessively high and excessively low temperatures that could lead to condensation.

[0042] According to one embodiment of this application, it also includes:

[0043] The second temperature detection device is used to detect the temperature Tfin of the outdoor control module and is electrically connected to the controller;

[0044] The controller is configured to:

[0045] When the refrigerant radiator is in the first working state, determine whether the temperature Tfin of the outdoor control module is less than or equal to cd;

[0046] When Tfin > cd, determine whether the second flow regulating valve is fully open. If the second flow regulating valve is not fully open, increase the opening degree of the second flow regulating valve. If the second flow regulating valve is fully open, determine whether the first flow regulating valve is fully closed. If the first flow regulating valve is not fully closed, decrease the opening degree of the first flow regulating valve.

[0047] When the refrigerant radiator is in its first operating state, the opening of the first flow regulating valve and the second flow regulating valve are adjusted to ensure that Tfin ≤ cd, thus preventing the outdoor control module from overheating.

[0048] According to one embodiment of this application, the controller is configured as follows:

[0049] When the first flow regulating valve is fully closed, control the first flow regulating valve and the second flow regulating valve to be fully open, and then determine whether the air conditioning system has a subcooler;

[0050] When the air conditioning system does not have the subcooler, the refrigerant radiator is controlled to a second operating state, and the opening degree of the first throttling element is controlled to a%.

[0051] When the air conditioning system has the subcooler, the refrigerant radiator is controlled to be in a second operating state.

[0052] When the second flow regulating valve is fully open and the first flow regulating valve is fully closed, it means that all the refrigerant is flowing through the refrigerant radiator. If the refrigerant is still insufficient to meet the heat dissipation needs of the outdoor control module and the temperature of the outdoor control module is still high, the refrigerant radiator will be switched to the second working state. This will utilize the latent heat of the refrigerant to cool down the module, thus meeting the cooling needs of the outdoor control module and preventing it from becoming too hot.

[0053] According to one embodiment of this application, the controller is configured as follows:

[0054] When Tfin ≤ cd, determine whether Tfin is greater than Tdp + e. When Tfin ≤ Tdp + e, determine whether the first flow regulating valve is fully open. If the first flow regulating valve is not fully open, increase the opening of the first flow regulating valve. If the first flow regulating valve is fully open, determine whether the opening of the second flow regulating valve is less than or equal to g%. If the opening of the second flow regulating valve is not less than or equal to g%, decrease the opening of the second flow regulating valve. g ≥ 0 and g ≤ 10.

[0055] When the refrigerant radiator is in its first operating state, the opening of the first and second flow control valves is adjusted to ensure that Tfin > Tdp + e, thus preventing condensation caused by excessively low temperatures at the outdoor control module.

[0056] According to one embodiment of this application, the controller is configured as follows:

[0057] When the opening degree of the second flow regulating valve is less than or equal to g%, the first flow regulating valve and the second flow regulating valve are fully opened, and then it is determined whether the air conditioning system has a subcooler.

[0058] When the air conditioning system does not have the subcooler, the refrigerant radiator is controlled to a second operating state, and the opening degree of the first throttling element is controlled to a%.

[0059] When the air conditioning system has the subcooler, the refrigerant radiator is controlled to be in a second operating state.

[0060] When the first flow regulating valve is fully open and the opening degree of the second flow regulating valve is less than or equal to g%, it indicates that less refrigerant is flowing through the refrigerant radiator. If the cooling capacity provided by the refrigerant is still relatively large and the temperature of the outdoor control module is still low, the refrigerant radiator can be switched to the second working state. This can utilize the latent heat of the refrigerant to cool down the module, and the control of the refrigerant flow rate by the first throttling device can meet the cooling needs of the outdoor control module. It can also prevent condensation from occurring in the outdoor control module due to its low temperature.

[0061] According to one embodiment of this application, the outdoor unit further includes:

[0062] The second commutation device includes a first interface, a second interface, a third interface, and a fourth interface;

[0063] The third commutation device includes a fifth interface, a sixth interface, a seventh interface, and an eighth interface;

[0064] The first interface is connected to the second end of the second flow regulating valve; the second interface is connected to the second end of the first flow regulating valve; the third interface is connected to the fifth interface; the fourth interface is connected to the first port.

[0065] The sixth interface is connected to the second end of the first throttling device, and the eighth interface is connected to the second port;

[0066] When the refrigerant radiator is in the first working state, the first interface and the fourth interface are connected, the second interface and the third interface are connected, the fifth interface and the eighth interface are connected, and the sixth interface and the seventh interface are connected.

[0067] When the refrigerant radiator is in the second working state, the first interface and the second interface are connected, the third interface and the fourth interface are connected, the fifth interface and the sixth interface are connected, the seventh interface and the eighth interface are connected, and the seventh interface is connected to the inlet of the gas-liquid separator or the gas injection port of the compressor.

[0068] The outdoor unit includes a second commutation device and a third commutation device. The second commutation device has a third state and a fourth state, and the third commutation device has a fifth state and a sixth state, which facilitates the realization of the first and second working states of the refrigerant radiator.

[0069] Secondly, embodiments of this application provide an air conditioning system, including:

[0070] The outdoor unit includes a first reversing device, a compressor, an outdoor heat exchanger, an outdoor throttling device, and a liquid-side shut-off valve;

[0071] The first reversing device includes a first valve port, a second valve port, a third valve port, and a fourth valve port;

[0072] The compressor's air inlet is connected to the first valve port via a gas-liquid separator, and the compressor's exhaust port is connected to the third valve port.

[0073] The first end of the outdoor throttling device is connected to the second valve port through the outdoor heat exchanger.

[0074] The first end of the liquid-side shut-off valve is connected to the fourth valve port via an indoor heat exchanger.

[0075] The outdoor unit also includes:

[0076] First flow control valve and second flow control valve;

[0077] First section of flow;

[0078] Of the second end of the outdoor throttling device and the second end of the liquid-side shut-off valve, the first end of the first flow regulating valve and the first end of the second flow regulating valve are connected to one of them, and the second end of the first flow regulating valve and the first end of the first throttling device are connected to the other.

[0079] The subcooler has an auxiliary refrigerant pipe inlet connected to the second end of the first throttling element, and the auxiliary refrigerant pipe is connected in series with the first throttling element.

[0080] A refrigerant radiator is used to dissipate heat from the outdoor control module and has a first working state and a second working state.

[0081] When the refrigerant radiator is in the first working state, the first port of the refrigerant radiator is connected to the second end of the second flow regulating valve, and the second port of the refrigerant radiator is connected to the second end of the first flow regulating valve;

[0082] When the refrigerant radiator is in the second working state, the second end of the second flow regulating valve is connected to the second end of the first flow regulating valve, the first port is connected to the outlet of the auxiliary refrigerant pipe, and the second port is connected to the inlet of the gas-liquid separator or the gas supply port of the compressor.

[0083] The refrigerant radiator is configured with a first operating state and a second operating state. The radiator's state can be selected based on the heat output of the outdoor control module. In the first operating state, the radiator utilizes the sensible heat of the refrigerant for cooling. In the second operating state, when there is a risk of overheating of the outdoor heat exchange module or condensation due to low outdoor temperature and high humidity, the radiator utilizes the latent heat of the refrigerant for cooling. In the second operating state, the refrigerant flow rate can be adjusted via a first throttling device. In the first operating state, the refrigerant flow rate can be adjusted via a first flow regulating valve and a second flow regulating valve. Both methods allow for refrigerant flow rate adjustment based on the heat output of the outdoor control module, preventing both overheating and condensation caused by low outdoor control module temperatures. Attached Figure Description

[0084] To more clearly illustrate the implementation methods in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0085] Figure 1 This is a structural diagram of an air conditioning system according to an embodiment of this application;

[0086] Figure 2 This is a structural diagram of a refrigerant radiator in its first operating state according to an embodiment of this application;

[0087] Figure 3This is a structural diagram of a refrigerant radiator in a second operating state according to an embodiment of this application;

[0088] Figure 4 This is another structural diagram of an air conditioning system according to an embodiment of this application;

[0089] Figure 5 This is another structural diagram of a refrigerant heat sink in a first operating state according to an embodiment of this application;

[0090] Figure 6 This is another structural diagram of a refrigerant radiator in a second operating state according to an embodiment of this application;

[0091] Figure 7 This is another structural diagram of an air conditioning system according to an embodiment of this application;

[0092] Figure 8 This is another structural diagram of a refrigerant heat sink in a first operating state according to an embodiment of this application;

[0093] Figure 9 This is another structural diagram of a refrigerant radiator in a second operating state according to an embodiment of this application;

[0094] Figure 10 This is a partial flowchart of an air conditioning system according to an embodiment of this application;

[0095] Figure 11 This is another partial flowchart of an air conditioning system according to an embodiment of this application;

[0096] Figure 12 This is another partial flowchart of an air conditioning system according to an embodiment of this application;

[0097] Figure 13 This is another partial flowchart of an air conditioning system according to an embodiment of this application;

[0098] Figure 14 This is another structural diagram of an air conditioning system according to an embodiment of this application;

[0099] Figure 15 This is another structural diagram of an air conditioning system according to an embodiment of this application.

[0100] Explanation of reference numerals in the attached figures:

[0101] 100 - Outdoor unit;

[0102] 1-First reversing device; S-First valve port; C-Second valve port; D-Third valve port; E-Fourth valve port;

[0103] 21-Compressor; 22-Oil separator; 23-First check valve; 24-Outdoor heat exchanger; 25-Outdoor throttling device; 26-Liquid-side shut-off valve;

[0104] 27-First flow control valve; 28-Second flow control valve;

[0105] 51-First switch; 52-Second switch; 53-Third switch; 54-Fourth switch;

[0106] 57-First throttling element; 58-Refrigerant radiator; M-First port; N-Second port; 59-Gas-liquid separator; 60-Subcooler; 601-Auxiliary refrigerant pipe; 602-Main refrigerant pipe;

[0107] 3-Second commutation device; A-First interface; B-Second interface; F-Third interface; G-Fourth interface;

[0108] 4 - Third commutator; H - Fifth interface; J - Sixth interface; K - Seventh interface; L - Eighth interface;

[0109] 400 - Water module; 71 - First heat exchanger; 711 - First refrigerant pipe; 712 - First liquid pipe; 72 - Second throttling element;

[0110] 200-Indoor unit; 81-Indoor heat exchanger; 82-Indoor throttling device. Detailed Implementation

[0111] To make the objectives, implementation methods and advantages of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only some embodiments of this application, and not all embodiments.

[0112] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0113] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0114] As described in the background section, an air conditioning system includes a compressor, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger. In cooling mode, the outdoor heat exchanger acts as a condenser, and the indoor heat exchanger acts as an evaporator. In heating mode, the outdoor heat exchanger acts as an evaporator, and the indoor heat exchanger acts as a condenser. The refrigerant sequentially passes through the compressor, condenser, throttling device, and evaporator to form a refrigerant circuit.

[0115] The compressor is used to compress low-temperature, low-pressure gaseous refrigerant and output high-temperature, high-pressure gaseous refrigerant. The condenser is used to condense high-temperature, high-pressure gaseous refrigerant and output medium-temperature, high-pressure liquid refrigerant. The throttling device is used to throttle medium-temperature, high-pressure liquid refrigerant and output low-temperature, low-pressure gas-liquid mixture refrigerant. The evaporator is used to evaporate low-temperature, low-pressure gas-liquid mixture refrigerant and output low-temperature, low-pressure gaseous refrigerant.

[0116] In related technologies, a refrigerant radiator is installed in the air conditioning system. The refrigerant radiator is connected in the refrigerant circuit, and the refrigerant can flow through the refrigerant radiator to dissipate heat from the outdoor control module.

[0117] The refrigerant radiator is typically connected between the condenser and the expansion joint, allowing the condensed refrigerant to dissipate heat to the outdoor control module. However, when the indoor load is low, the refrigerant flow rate is low, leading to overheating of the outdoor control module. Similarly, when the outdoor temperature is high, the condensed refrigerant temperature is high, also causing overheating of the outdoor control module. When the air conditioning system includes a water module, if the outdoor temperature is high and the water module is used to dry the indoor floor, the low inlet water temperature of the water module's heat exchanger will result in a low refrigerant temperature flowing out of the heat exchanger, causing the outdoor control module to cool down. In high-temperature and high-humidity outdoor environments, condensation is likely to occur on the outdoor control module. Overheating of the outdoor control module can also reduce the lifespan of its internal components.

[0118] To address the aforementioned technical problems, this application proposes an air conditioning system. The air conditioning system includes an outdoor unit. The outdoor unit includes a first reversing device, a compressor, an outdoor heat exchanger, an outdoor throttling device, and a liquid-side shut-off valve. The first reversing device includes a first valve port, a second valve port, a third valve port, and a fourth valve port. The compressor's inlet is connected to the first valve port via a gas-liquid separator. The compressor's outlet is connected to the third valve port. The first end of the outdoor throttling device is connected to the second valve port via the outdoor heat exchanger. The first end of the liquid-side shut-off valve is connected to the fourth valve port via an indoor heat exchanger. The outdoor unit includes an adjustable-opening first flow regulating valve, an adjustable-opening second flow regulating valve, and a first throttling device. Of the second end of the outdoor throttling device and the second end of the liquid-side shut-off valve, the first end of the first flow regulating valve and the first end of the second flow regulating valve are connected to one of them, and the second end of the first flow regulating valve and the first end of the first throttling device are connected to the other. A refrigerant radiator is used to dissipate heat from the outdoor control module and has a first operating state and a second operating state. When the refrigerant radiator is in its first operating state, its first port is connected to the second end of the second flow regulating valve, and its second port is connected to the second end of the first flow regulating valve. When the refrigerant radiator is in its second operating state, the second end of the second flow regulating valve is connected to the second end of the first flow regulating valve, the first port of the refrigerant radiator is connected to the second end of the first throttling element, and the second port of the refrigerant radiator is connected to the inlet of the gas-liquid separator or the compressor's gas supply port. The refrigerant radiator's state can be selected based on the heat output of the outdoor control module. It can be set to its first operating state, utilizing the sensible heat of the refrigerant for cooling. When there is a risk of overheating in the outdoor heat exchange module or condensation due to low outdoor temperature and high humidity, the radiator can be switched to its second operating state, utilizing the latent heat of the refrigerant for cooling. In the second operating state, the amount of refrigerant flowing through the radiator can be adjusted using the first throttling device. In the first operating state, the amount of refrigerant flowing through the radiator can be adjusted using both the first and second flow regulating valves. Both methods allow for refrigerant flow regulation based on the heat output of the outdoor control module, preventing both excessively high and low temperatures that could lead to condensation.

[0119] The air conditioning system will be described in detail below with reference to the accompanying drawings. Figure 14 and Figure 15 The arrows in the diagram indicate the direction of liquid flow.

[0120] refer to Figure 1 , Figure 2 and Figure 3 This application provides an air conditioning system. The air conditioning system includes an outdoor unit 100. The outdoor unit 100 includes a first reversing device 1. The first reversing device 1 is used to change the flow direction of the refrigerant. The first reversing device 1 can be a solenoid four-way valve.

[0121] The first reversing device 1 may include a first valve port S. The first reversing device 1 may include a second valve port C. The first reversing device 1 may include a third valve port D. The first reversing device 1 may include a fourth valve port E.

[0122] The first commutator 1 may have a seventh state. The first commutator 1 may have an eighth state. The first commutator 1 may switch between the seventh state and the eighth state.

[0123] When the first reversing device 1 is in the seventh state, the first valve port S and the second valve port C are connected, and the third valve port D and the fourth valve port E are connected. When the first reversing device 1 is in the eighth state, the first valve port S and the fourth valve port E are connected, and the second valve port C and the third valve port D are connected.

[0124] The outdoor unit 100 may include a compressor 21. The compressor 21 is used to compress low-temperature, low-pressure gaseous refrigerant and output high-temperature, high-pressure gaseous refrigerant.

[0125] The air inlet of compressor 21 is connected to the first valve port S via a gas-liquid separator 59. The exhaust port of compressor 21 is connected to the third valve port D. An oil separator 22 may be connected between the exhaust port of compressor 21 and the third valve port D. A first check valve 23 may be connected between the exhaust port of compressor 21 and the oil separator 22 to prevent refrigerant from flowing back into compressor 21.

[0126] The outdoor unit 100 may include an outdoor heat exchanger 24. The outdoor heat exchanger 24 is used for heat exchange between the refrigerant and the air. The outdoor unit 100 may include an outdoor throttling device 25. The first end of the outdoor throttling device 25 can be connected to a second valve port C through the outdoor heat exchanger 24. The outdoor throttling device 25 may be an electronic expansion valve.

[0127] The air conditioning system includes an indoor unit 200. The indoor unit 200 includes an indoor heat exchanger 81. The outdoor unit 100 may include a liquid-side shut-off valve 26. The first end of the liquid-side shut-off valve 26 is connected to a fourth valve port E through the indoor heat exchanger 81.

[0128] The indoor unit 200 may include an indoor throttling device 82. The indoor throttling device 82 may be connected between the indoor heat exchanger 81 and the liquid-side shut-off valve 26. The indoor throttling device 82 may be an electronic expansion valve.

[0129] The outdoor unit 100 may include a first flow regulating valve 27. The opening degree of the first flow regulating valve 27 is adjustable. The first flow regulating valve 27 may be an electric ball valve.

[0130] The outdoor unit 100 may include a second flow regulating valve 28. The opening degree of the second flow regulating valve 28 is adjustable. The second flow regulating valve 28 may be an electric ball valve.

[0131] The outdoor unit 100 may include a first throttling element 57. The first throttling element 57 may be an electronic expansion valve.

[0132] Of the two ends of the outdoor throttling device 25 and the liquid-side shut-off valve 26, the first end of the first flow regulating valve 27 and the first end of the second flow regulating valve 28 are connected to one of them, and the second end of the first flow regulating valve 27 and the first end of the first throttling device 57 are connected to the other.

[0133] The outdoor unit 100 may include a refrigerant radiator 58. The refrigerant radiator 58 is used to dissipate heat from the outdoor control module. The refrigerant radiator 58 has a first port M and a second port N.

[0134] The refrigerant radiator 58 has a first operating state. When the refrigerant radiator 58 is in the first operating state, the first port M of the refrigerant radiator 58 is connected to the second end of the second flow regulating valve 28, and the second port N of the refrigerant radiator 58 is connected to the second end of the first flow regulating valve 27.

[0135] The refrigerant radiator 58 has a second operating state. When the refrigerant radiator 58 is in the second operating state, the second end of the second flow regulating valve 28 is connected to the second end of the first flow regulating valve 27, the first port M of the refrigerant radiator 58 is connected to the second end of the first throttling element 57, and the second port N of the refrigerant radiator 58 is connected to the inlet of the gas-liquid separator 59 or the gas supply port of the compressor 21.

[0136] The refrigerant radiator 58 is configured to have a first working state, which allows the refrigerant flowing out of the condenser to flow through the refrigerant radiator 58, thereby cooling the outdoor control module. When the refrigerant flows through the refrigerant radiator 58, the state of the refrigerant does not change, which can be referred to as using the sensible heat of the refrigerant to cool the outdoor control module.

[0137] The refrigerant radiator 58 is configured to have a second working state, which allows the refrigerant flowing out from the first throttling element 57 to flow through the refrigerant radiator 58, thereby cooling the outdoor control module. When the refrigerant flows through the refrigerant radiator 58, the refrigerant changes from a liquid state to a gaseous state, which can be referred to as using the latent heat of the refrigerant to cool the outdoor control module.

[0138] In this application, the refrigerant radiator 58 is configured with a first operating state and a second operating state. The state of the refrigerant radiator 58 can be selected according to the heat output of the outdoor control module. The refrigerant radiator 58 can be in the first operating state, using the sensible heat of the refrigerant for cooling. When there is a risk of the outdoor heat exchange module overheating or condensation due to low outdoor temperature and high humidity, the refrigerant radiator 58 is switched to the second operating state, using the latent heat of the refrigerant for cooling. When the refrigerant radiator 58 is in the second operating state, the amount of refrigerant flowing through the refrigerant radiator 58 can be adjusted by the first throttling element 57. When the refrigerant radiator 58 is in the first operating state, the amount of refrigerant flowing through the refrigerant radiator 58 can be adjusted by the first flow regulating valve 27 and the second flow regulating valve 28. Both methods can adjust the refrigerant flow rate according to the heat output of the outdoor control module, avoiding both overheating and condensation caused by low outdoor control module temperature.

[0139] In some embodiments, reference Figure 1 , Figure 2 and Figure 3 The outdoor unit 100 may include a second reversing device 3. The second reversing device 3 includes a first interface A. The second reversing device 3 includes a second interface B. The second reversing device 3 includes a third interface F. The second reversing device 3 includes a fourth interface G. The second reversing device 3 may be an electric four-way valve.

[0140] The outdoor unit 100 may include a third reversing device 4. The third reversing device 4 includes a fifth interface H. The third reversing device 4 includes a sixth interface J. The third reversing device 4 includes a seventh interface K. The third reversing device 4 includes an eighth interface L. The third reversing device 4 may be an electric four-way valve.

[0141] The first interface A is connected to the second end of the second flow regulating valve 28. The second interface B is connected to the second end of the first flow regulating valve 27. The third interface F is connected to the fifth interface H. The fourth interface G is connected to the first port M of the refrigerant radiator 58.

[0142] The sixth interface J is connected to the second end of the first throttling device 57. The eighth interface L is connected to the second port N of the refrigerant radiator 58.

[0143] The second commutator 3 has a third state. When the second commutator 3 is in the third state, the first interface A and the second interface B are connected, and the third interface F and the fourth interface G are connected.

[0144] The second commutator 3 has a fourth state. When the second commutator 3 is in the fourth state, the first interface A and the fourth interface G are connected, and the second interface B and the third interface F are connected.

[0145] The third commutator 4 has a fifth state. When the third commutator 4 is in the fifth state, the fifth interface H and the sixth interface J are connected, and the seventh interface K and the eighth interface L are connected.

[0146] The third commutator 4 has a sixth state. When the third commutator 4 is in the sixth state, the fifth interface H and the eighth interface L are connected, and the sixth interface J and the seventh interface K are connected.

[0147] When the refrigerant radiator 58 is in the first working state, the second reversing device 3 is in the fourth state, and the third reversing device 4 is in the sixth state. When the refrigerant radiator 58 is in the second working state, the second reversing device 3 is in the third state, the third reversing device 4 is in the fifth state, and the seventh interface K is connected to the inlet of the gas-liquid separator 59 or the gas supply port of the compressor 21.

[0148] Specifically, when the refrigerant radiator 58 is in the first working state, the first interface A and the fourth interface G are connected, the second interface B and the third interface F are connected, the fifth interface H and the eighth interface L are connected, and the sixth interface J and the seventh interface K are connected.

[0149] When the refrigerant radiator 58 is in the second working state, the first interface A and the second interface B are connected, the third interface F and the fourth interface G are connected, the fifth interface H and the sixth interface J are connected, the seventh interface K and the eighth interface L are connected, and the seventh interface K is connected to the inlet of the gas-liquid separator 59 or the gas supply port of the compressor 21.

[0150] In this application, the outdoor unit 100 includes a second commutation device 3 and a third commutation device 4. The second commutation device 3 has a third state and a fourth state, and the third commutation device 4 has a fifth state and a sixth state, which facilitates the realization of the first working state and the second working state of the refrigerant radiator 58.

[0151] In some embodiments, reference Figure 4 , Figure 5 and Figure 6 When the air conditioning system includes a subcooler 60, the subcooler 60 includes an auxiliary refrigerant pipe 601. The inlet of the auxiliary refrigerant pipe 601 is connected to the second end of the first throttling element 57, and the auxiliary refrigerant pipe 601 is connected in series with the first throttling element 57.

[0152] The subcooler 60 includes a main refrigerant pipe 602. The main refrigerant pipe and the auxiliary refrigerant pipe 601 exchange heat. The main refrigerant pipe 602 is connected in series with a first flow regulating valve 27, and the internal passage of the main refrigerant pipe 602 is connected to the second end of the first flow regulating valve 27. The subcooler 60 can be a plate heat exchanger.

[0153] When the air conditioning system includes a subcooler 60 and the refrigerant radiator 58 is in the second operating state, the first port M of the refrigerant radiator 58 is connected to the outlet of the auxiliary refrigerant pipe 601, and the second port N of the refrigerant radiator 58 is connected to the inlet of the gas-liquid separator 59 or the gas supply port of the compressor 21.

[0154] In some embodiments, when the refrigerant radiator 58 is in the second operating state and the second port N of the refrigerant radiator 58 is connected to the inlet of the gas-liquid separator 59, the seventh interface K is connected to the inlet of the gas-liquid separator 59, or the seventh interface K is connected to both the inlet of the gas-liquid separator 59 and the gas supply port of the compressor 21.

[0155] When the refrigerant radiator 58 is in the second working state and the second port N of the refrigerant radiator 58 is connected to the air supply port of the compressor 21, the seventh port K is connected to both the inlet of the gas-liquid separator 59 and the air supply port of the compressor 21.

[0156] In some embodiments, reference Figure 7 , Figure 8 and Figure 9 The outdoor unit 100 may include a first switch 51. The outdoor unit 100 may include a second switch 52. The first switch 51 may be a shut-off valve. The second switch 52 may be a shut-off valve.

[0157] The first end of the first switch 51 is connected to the inlet of the gas-liquid separator 59. The first end of the second switch 52 is connected to the air supply port of the compressor 21. The second ends of the first switch 51 and the second ends of the second switch 52 are connected. The second ends of the first switch 51, the second ends of the second switch 52, and the seventh interface K are interconnected.

[0158] In some embodiments, the air conditioning system may include a first temperature detection device. The first temperature detection device is used to detect the outdoor ambient temperature Ta. Specifically, the first temperature detection device may be a temperature sensor.

[0159] In some embodiments, the air conditioning system may include a controller. The controller includes an outdoor control module. The controller is electrically connected to a first throttling element 57. The controller can control the opening degree of the first throttling element 57. The controller can be electrically connected to a compressor 21. The controller can control the operating state and operating frequency of the compressor 21. The controller can be electrically connected to a first temperature sensing device. The controller can acquire the outdoor ambient temperature Ta detected by the first temperature sensing device. The controller can be electrically connected to a first flow regulating valve 27. The controller can control the opening degree of the first flow regulating valve 27. The controller can be electrically connected to a second flow regulating valve 28. The controller can control the opening degree of the second flow regulating valve 28.

[0160] refer to Figure 10 and Figure 11 The controller is configured as follows:

[0161] When the start signal for starting the outdoor unit 100 is received, the opening degree EVB of the first throttling device 57 is controlled to be a%, the first flow regulating valve 27 and the second flow regulating valve 28 are fully opened, and then it is determined whether the outdoor ambient temperature Ta is greater than b.

[0162] When Ta>b, the refrigerant radiator 58 is controlled to enter the second working state.

[0163] When Ta≤b, determine whether the air conditioning system has a subcooler 60;

[0164] When the air conditioning system does not have a subcooler 60, the opening degree of the first throttling element 57 is controlled to be zero, and then the refrigerant radiator 58 is controlled to be in the first working state; when the air conditioning system has a subcooler 60, the refrigerant radiator 58 is controlled to be in the first working state.

[0165] When the outdoor unit 100 is first started, the outdoor control module generates a large amount of heat. When Ta>b, the outdoor ambient temperature is relatively high, the refrigerant radiator 58 is controlled in its second operating state, using the latent heat of the refrigerant to cool the outdoor control module and prevent the outdoor control module from overheating when the outdoor unit 100 is first started. When Ta≤b, the outdoor ambient temperature is relatively low, the refrigerant radiator 58 is controlled in its first operating state, using the sensible heat of the refrigerant to cool the outdoor control module. This ensures that the refrigerant in the air conditioning system can flow more to the evaporator while maintaining a suitable temperature for the outdoor control module, thus ensuring the heat exchange effect of the evaporator and improving the overall performance of the air conditioning system. Before the refrigerant radiator 58 switches to the first working state, it is determined whether there is a subcooler 60. When there is a subcooler 60, the opening of the first throttling element 57 is not adjusted, so that the subcooler 60 can play the role of subcooling the refrigerant. When there is no subcooler 60, the opening of the first throttling element 57 is adjusted to zero, so that more refrigerant in the air conditioning system can flow to the evaporator, ensuring the heat exchange effect of the evaporator.

[0166] Specifically, a ≥ 4, to avoid the outdoor control module temperature being too high due to a small opening of the first throttling element 57. a ≤ 10, to avoid the outdoor control module temperature being too low due to a large opening of the first throttling element 57, and to avoid condensation on the outdoor control module under high outdoor temperature and humidity. Specifically, a ≥ 6. a ≤ 8. a can be 6, 7, or 8. Among them, Ta ≥ 45℃, to avoid setting the outdoor ambient temperature too low, so that when the outdoor ambient temperature is high enough, latent heat cooling is used. When sensible heat cooling meets the cooling requirements, sensible heat is used as much as possible to avoid using latent heat affecting the heat exchange effect of the evaporator. Ta can be 48℃.

[0167] In some embodiments, reference Figure 12The controller is configured as follows:

[0168] When the refrigerant radiator 58 is in the second working state, when the opening degree EVB of the first throttling element 57 is ≤ a%×β, or when the opening degree EVB of the first throttling element 57 is > a%×β, the opening degree EVB of the first throttling element 57 is ≤ a%×α, and the duration of the opening degree of the first throttling element 57 being less than or equal to a%×α is greater than or equal to τ, it is determined whether the air conditioning system has a subcooler 60.

[0169] When the air conditioning system does not have a subcooler 60, the opening degree of the first throttling element 57 is controlled to be zero, and then the refrigerant radiator 58 is controlled to be in the first operating state; when the air conditioning system has a subcooler 60, the refrigerant radiator 58 is controlled to be in the first operating state. Specifically, after controlling the refrigerant radiator 58 to be in the first operating state, the compressor 21 is controlled to be in the start state.

[0170] With the above settings, after the opening of the first throttling element 57 is very small or after the first throttling element 57 is stable at a small opening for a certain period of time, the refrigerant radiator 58 switches to the first working state, using the sensible heat of the refrigerant to cool the outdoor control module. Under the premise of ensuring that the outdoor control module temperature is suitable, more refrigerant in the air conditioning system can flow to the evaporator, ensuring the heat exchange effect of the evaporator and improving the overall performance of the air conditioning system.

[0171] Specifically, β≥0.6 prevents the refrigerant radiator from operating in the second state when the opening of the first throttling element 57 is too small. This allows the sensible heat of the refrigerant to be used for cooling when the outdoor control module's cooling demand is low, enabling more refrigerant to flow to the evaporator in the air conditioning system, ensuring the evaporator's heat exchange effect and improving the overall performance of the air conditioning system. β≤0.9 prevents the refrigerant radiator from directly switching to the first operating state when the opening of the first throttling element 57 is too large.

[0172] α≥1 prevents the refrigerant radiator from operating in the second state when the opening of the first throttling element 57 is too small, allowing cooling to be achieved using the sensible heat of the refrigerant when the cooling demand of the outdoor control module is relatively low. α≤2 prevents the refrigerant radiator from directly switching to the first operating state when the opening of the first throttling element 57 is too large. Specifically, α can be 1.5.

[0173] τ ≥ 5 min, to avoid switching directly to the first operating state for too short a duration, preventing accidental switching that could cause excessive temperature rise in the outdoor control module. τ ≤ 20 min, to avoid the refrigerant radiator remaining in the second operating state for too long, allowing cooling using the sensible heat of the refrigerant when the outdoor control module requires less cooling. Specifically, τ can be 10 min.

[0174] In some embodiments, the air conditioning system may include a second temperature detection device. The second temperature detection device is used to detect the temperature Tfin of the outdoor control module. Specifically, the second temperature detection device may be a temperature sensor.

[0175] The second temperature detection device is electrically connected to the controller. The controller can acquire the temperature Tfin of the outdoor control module detected by the second temperature detection device.

[0176] refer to Figure 10 The controller is configured as follows:

[0177] When the refrigerant radiator 58 is in its second operating state, if the opening degree EVB of the first throttling element 57 is greater than a% × α, or if the opening degree EVB of the first throttling element 57 is greater than a% × β, the opening degree EVB of the first throttling element 57 is less than or equal to a% × α, and the duration of the opening degree EVB of the first throttling element 57 being less than or equal to a% × α is less than τ, then it is determined whether the temperature Tfin of the outdoor control module is less than or equal to cd and whether the temperature of the outdoor control module is greater than the sum of the ambient dew point temperature Tdp and e. Specifically, cd is c minus d.

[0178] When Tfin>cd, increase the opening of the first throttling element 57; when Tfin≤cd and Tfin>Tdp+e, keep the opening of the first throttling element 57 unchanged; when Tfin≤cd and Tfin≤Tdp+e, decrease the opening of the first throttling element 57.

[0179] When the opening degree EVB of the first throttling element 57 is greater than a% × α, it indicates that the opening degree EVB of the first throttling element 57 is relatively large, and the outdoor control module generates a lot of heat. When the opening degree EVB of the first throttling element 57 is greater than a% × β and the opening degree EVB of the first throttling element 57 is less than a% × α, it indicates that the opening degree EVB of the first throttling element 57 is within a medium range. When the opening degree EVB of the first throttling element 57 is greater than a% × β, the opening degree EVB of the first throttling element 57 is less than a% × α, and the duration of the opening degree EVB of the first throttling element 57 being less than or equal to a% × α is less than τ, it indicates that the time when the opening degree of the first throttling element 57 is within a medium range is relatively short, and the outdoor control module may still generate a lot of heat.

[0180] This design ensures that when the outdoor control module is generating high heat and there is a high possibility of heat transfer, the refrigerant radiator 58 remains in its second operating state, utilizing the latent heat of the refrigerant to better cool the outdoor control module and improve its cooling effect. The system is configured to maintain the opening of the first throttling element 57 unchanged when Tfin ≤ cd and Tfin > Tdp + e, increase the opening of the first throttling element 57 when Tfin > cd, and decrease the opening of the first throttling element 57 when Tfin ≤ cd and Tfin ≤ Tdp + e. This allows for adjustment of the opening of the first throttling element 57 based on the temperature at the outdoor control module, keeping the temperature within a suitable range and preventing both excessively high and excessively low temperatures that could lead to condensation.

[0181] Where 'c' represents the maximum allowable temperature of the outdoor control module. 'd' ≥ 5℃ is used to prevent damage to the outdoor control module due to excessively high actual allowable temperature. 'd' ≤ 15℃ is used to prevent excessively low actual allowable maximum temperature of the outdoor control module, which would place high demands on the air conditioning system and require too much refrigerant, resulting in poor evaporator heat exchange. Specifically, 'd' ≥ 6℃ and 'd' ≤ 8℃ are also considered.

[0182] e≥0℃, to avoid condensation on the indoor control module caused by the outdoor control module's actual allowable temperature being too low. e≤10℃, to avoid placing high demands on the air conditioning system due to the outdoor control module's actual minimum allowable temperature, and to avoid requiring too much refrigerant, resulting in poor evaporator heat exchange. Specifically, e≥2℃. e≤4℃.

[0183] Specifically, when increasing or decreasing the opening of the first throttling element 57, the change in the number of steps of the first throttling element 57 is f. f ≥ 5pls is used to avoid small changes in the number of steps each time, resulting in minimal temperature changes in the outdoor control module and low efficiency. f ≤ 50pls is used to avoid large changes in the number of steps each time, resulting in large temperature changes in the outdoor control module and preventing the outdoor control module from failing to reach a suitable temperature. Specifically, f ≥ 8pls is used. f ≤ 12pls is used.

[0184] In some embodiments, the air conditioning system may include a second temperature detection device. The second temperature detection device is used to detect the temperature Tfin of the outdoor control module. Specifically, the second temperature detection device may be a temperature sensor.

[0185] The second temperature detection device is electrically connected to the controller. The controller can acquire the temperature Tfin of the outdoor control module detected by the second temperature detection device.

[0186] refer to Figure 11 and Figure 13 The controller is configured as follows:

[0187] When the refrigerant radiator 58 is in its first operating state, determine whether the temperature Tfin of the outdoor control module is less than or equal to cd.

[0188] When Tfin>cd, determine whether the second flow regulating valve 28 is fully open. If the second flow regulating valve 28 is not fully open, increase the opening degree of the second flow regulating valve 28. If the second flow regulating valve 28 is fully open, determine whether the first flow regulating valve 2 is fully closed. If the first flow regulating valve 27 is not fully closed, decrease the opening degree of the first flow regulating valve.

[0189] When the refrigerant radiator 58 is in the first working state, the opening of the first flow regulating valve and the second flow regulating valve are adjusted to ensure that Tfin ≤ cd, so as to avoid the temperature at the outdoor control module being too high.

[0190] refer to Figure 11 and Figure 13 The controller is configured as follows:

[0191] When the first flow regulating valve 27 is fully closed, the first flow regulating valve 27 and the second flow regulating valve 28 are fully opened, and then it is determined whether the air conditioning system has a subcooler 60. When the air conditioning system does not have a subcooler 60, the refrigerant radiator 58 is controlled to the second operating state, and the opening degree of the first throttling element 57 is controlled to a%. When the air conditioning system has a subcooler 60, the refrigerant radiator 58 is controlled to the second operating state.

[0192] When the second flow regulating valve 28 is fully open and the first flow regulating valve 27 is fully closed, it means that all refrigerant is flowing through the refrigerant radiator 58. If the refrigerant is still insufficient to meet the heat dissipation needs of the outdoor control module and the temperature of the outdoor control module is still high, the refrigerant radiator 58 will be switched to the second working state. This will utilize the latent heat of the refrigerant to cool down the module, thus meeting the cooling needs of the outdoor control module and preventing it from becoming too hot.

[0193] refer to Figure 11 and Figure 13 The controller is configured as follows:

[0194] When Tfin ≤ cd, determine if Tfin is greater than Tdp + e. When Tfin ≤ Tdp + e, determine if the first flow regulating valve 27 is fully open. If the first flow regulating valve 27 is not fully open, increase the opening of the first flow regulating valve 27. If the first flow regulating valve 27 is fully open, determine if the opening of the second flow regulating valve 28 is less than or equal to g%. If the opening of the second flow regulating valve 28 is not less than or equal to g%, decrease the opening of the second flow regulating valve 28. When g ≥ 0 and g ≤ 10, to avoid the second flow regulating valve from being too large and still needing to decrease, switch the refrigerant radiator to the second working state, so as to make full use of the sensible heat of the refrigerant.

[0195] When the refrigerant radiator 58 is in the first working state, the opening of the first flow regulating valve 27 and the second flow regulating valve 28 is adjusted to make Tfin > Tdp + e, so as to avoid condensation caused by excessively low temperature at the outdoor control module.

[0196] Specifically, when the opening degree of the first flow regulating valve 27 is greater than 70% and less than or equal to 100%, the single adjustment amount of the opening degree of the first flow regulating valve 27 is 15%. When the opening degree of the first flow regulating valve 27 is greater than 40% and less than or equal to 70%, the single adjustment amount of the opening degree of the first flow regulating valve 27 is 10%. When the opening degree of the first flow regulating valve 27 is less than or equal to 40%, the single adjustment amount of the opening degree of the first flow regulating valve 27 is 5%.

[0197] Specifically, when the opening degree of the second flow regulating valve 28 is greater than 70% and less than or equal to 100%, the single adjustment amount of the opening degree of the second flow regulating valve 28 is 15%. When the opening degree of the second flow regulating valve 28 is greater than 40% and less than or equal to 70%, the single adjustment amount of the opening degree of the second flow regulating valve 28 is 10%. When the opening degree of the second flow regulating valve 28 is less than or equal to 40%, the single adjustment amount of the opening degree of the second flow regulating valve 28 is 5%.

[0198] refer to Figure 11 and Figure 13 The controller is configured as follows:

[0199] When the opening degree of the second flow regulating valve 28 is less than or equal to g%, the first flow regulating valve 27 and the second flow regulating valve 28 are fully opened, and then it is determined whether the air conditioning system has a subcooler 60; when the air conditioning system does not have a subcooler 60, the refrigerant radiator 58 is controlled to the second working state, and the opening degree of the first throttling device 57 is controlled to a%; when the air conditioning system has a subcooler 60, the refrigerant radiator 58 is controlled to the second working state.

[0200] When the first flow regulating valve 27 is fully open and the opening degree of the second flow regulating valve 28 is less than or equal to g%, it indicates that the refrigerant flowing through the refrigerant radiator 58 is relatively small. If the cooling capacity provided by the refrigerant is still relatively large and the temperature of the outdoor control module is still low, the refrigerant radiator 58 is switched to the second working state. This can utilize the latent heat of the refrigerant to cool down the module, and the control of the refrigerant flow rate by the first throttling element 57 can meet the cooling needs of the outdoor control module. It can also prevent condensation from occurring in the outdoor control module due to its low temperature.

[0201] In some embodiments, reference Figure 1 , Figure 11 , Figure 12 and Figure 13 After receiving the start signal from outdoor unit 100, the controller performs the following steps:

[0202] S1: Control the opening degree EVB of the first throttling element 57 to a%, control the first flow regulating valve 27 and the second flow regulating valve 28 to be fully open, and then execute S2;

[0203] S2: Determine if the outdoor ambient temperature Ta is greater than b. If yes, execute S3; otherwise, execute S12.

[0204] S3: Control the refrigerant radiator 58 to the second working state, then control the compressor 21 to start, and then execute S4;

[0205] S4: Determine whether the opening degree EVB of the first throttling device 57 is greater than a%×β. If yes, execute S5; otherwise, execute S12.

[0206] S5: Determine whether the opening degree EVB of the first throttling device 57 is greater than a%×α. If yes, execute S6; otherwise, execute S11.

[0207] S6: Determine whether the temperature Tfin of the outdoor control module is less than or equal to cd. If yes, proceed to S7; otherwise, proceed to S10.

[0208] S7: Determine whether the temperature Tfin of the outdoor control module is greater than the sum of the ambient dew point temperature Tdp and e. If so, the opening of the first throttling device 57 remains unchanged, and then execute S8. If not, execute S9.

[0209] S8: Determine if outdoor unit 100 is stopped. If yes, end; otherwise, execute S4.

[0210] S9: The opening of the first throttling element 57 decreases, the number of steps of the first throttling element 57 changes to f, and then S4 is executed;

[0211] S10: The opening of the first throttling element 57 is increased, the number of steps of the first throttling element 57 changes to f, and then S6 is executed;

[0212] S11: Determine whether the duration of the opening degree of the first throttling element 57 being less than or equal to a%×α is less than τ. If yes, execute S6; otherwise, execute S12.

[0213] S12: Determine if there is a subcooler 60. If not, the opening of the first throttling element 57 is zero, and then execute S13. If yes, execute S13.

[0214] S13: Control the refrigerant radiator 58 to the first working state, then control the compressor 21 to the start state, and then execute S14;

[0215] S14: Determine whether the temperature Tfin of the outdoor control module is less than or equal to cd. If yes, proceed to S15; otherwise, proceed to S17.

[0216] S15: Determine whether the temperature Tfin of the outdoor control module is greater than the sum of the ambient dew point temperature Tdp and e. If yes, execute S16; otherwise, execute S19.

[0217] S16: Determine if outdoor unit 100 is stopped. If yes, end; otherwise, execute S14.

[0218] S17: Determine whether the second flow regulating valve 28 is fully open. If not, increase the opening of the second flow regulating valve 28 and then execute S14. If yes, execute S18.

[0219] S18: Determine whether the first flow regulating valve 27 is fully closed. If not, reduce the opening of the first flow regulating valve 27 and then execute S14. If yes, execute S21.

[0220] S19: Determine whether the first flow regulating valve 27 is fully open. If not, increase the opening of the first flow regulating valve 27 and then execute S15. If yes, execute S20.

[0221] S20: Determine whether the opening degree of the second flow regulating valve 28 is less than or equal to g%. If not, the opening degree of the second flow regulating valve 28 is reduced, and then S15 is executed. If yes, then S21 is executed.

[0222] S21: Determine if there is a subcooler 60. If yes, execute S3. If no, control the refrigerant radiator 58 to the second working state, then control the compressor 21 to start, control the opening degree EVB of the first throttling element 57 to a%, and then execute S4.

[0223] In some embodiments, reference Figure 14 and Figure 15 The air conditioning system may include a water module 400. The water module 400 includes a first heat exchanger 71. The first heat exchanger 71 includes a first refrigerant pipe 711. The first heat exchanger 71 includes a first liquid pipe 712 for exchanging heat with the first refrigerant pipe 711.

[0224] The first refrigerant pipe 711 is connected in parallel with the indoor heat exchanger 81, and the two ends of the first refrigerant pipe 711 are respectively connected to the first end of the liquid-side shut-off valve 26 and the fourth valve port E. Alternatively, the first end of the first refrigerant pipe 711 is connected to the exhaust port of the compressor 21, the second end of the first refrigerant pipe 711 is connected to the second end of the outdoor throttling device 25 through the third switch 53, and the second end of the refrigerant pipe is connected to the second end of the liquid-side shut-off valve 26 through the fourth switch 54.

[0225] In some embodiments, reference Figure 14 and Figure 15When the first refrigerant pipe 711 is connected in parallel with the indoor heat exchanger 81, and both ends of the first refrigerant pipe 711 are connected to the first end and the fourth valve port E of the liquid-side shut-off valve 26, respectively, the first refrigerant pipe 711 is connected to the liquid-side shut-off valve 26 through the second throttling element 72. When the water module 400 stops, the second throttling element 72 is fully closed. When the water module 400 starts, the outdoor heat exchanger 24 acts as the evaporator, the first heat exchanger 71 acts as the condenser, and the second throttling element 72 is fully open.

[0226] In some embodiments, when the first end of the first refrigerant pipe 711 is connected to the exhaust port of the compressor 21, the second end of the first refrigerant pipe 711 is connected to the second end of the outdoor throttling device 25 via the third switch 53, and the second end of the refrigerant pipe is connected to the second end of the liquid-side shut-off valve 26 via the fourth switch 54, when the water module 400 is running and the outdoor heat exchanger 24 is a condenser, the third switch 53 is open and the fourth switch 54 is closed; when the water module 400 is running and the outdoor heat exchanger 24 is an evaporator, the third switch 53 is closed and the fourth switch 54 is open; when the water module 400 is not running, both the third switch 53 and the fourth switch 54 are closed.

[0227] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0228] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the above embodiments and various different variations of embodiments suitable for specific application considerations.

Claims

1. An air conditioning system, characterized in that, include: The outdoor unit includes a first reversing device, a compressor, an outdoor heat exchanger, an outdoor throttling device, and a liquid-side shut-off valve; The first reversing device includes a first valve port, a second valve port, a third valve port, and a fourth valve port; The compressor's air inlet is connected to the first valve port via a gas-liquid separator, and the compressor's exhaust port is connected to the third valve port. The first end of the outdoor throttling device is connected to the second valve port through the outdoor heat exchanger. The first end of the liquid-side shut-off valve is connected to the fourth valve port via an indoor heat exchanger. The outdoor unit also includes: First section of flow; First flow control valve and second flow control valve; Of the second end of the outdoor throttling device and the second end of the liquid-side shut-off valve, the first end of the first flow regulating valve and the first end of the second flow regulating valve are respectively connected to one of them, and the second end of the first flow regulating valve and the first end of the first throttling device are respectively connected to the other. A refrigerant radiator is used to dissipate heat from the outdoor control module and has a first working state and a second working state. When the refrigerant radiator is in the first working state, the first port of the refrigerant radiator is connected to the second end of the second flow regulating valve, and the second port of the refrigerant radiator is connected to the second end of the first flow regulating valve; When the refrigerant radiator is in the second working state, the second end of the second flow regulating valve is connected to the second end of the first flow regulating valve, the first port is connected to the second end of the first throttling element, and the second port is connected to the inlet of the gas-liquid separator or the gas injection port of the compressor.

2. The air conditioning system according to claim 1, characterized in that, Also includes: The first temperature detection device is used to detect the outdoor ambient temperature Ta; The controller is electrically connected to the first throttling element, the first flow regulating valve, the second flow regulating valve, and the first temperature detection device; the controller is configured to: Upon receiving a start signal to start the outdoor unit, the opening degree EVB of the first throttling device is controlled to a%, and the first flow regulating valve and the second flow regulating valve are fully opened. Then, it is determined whether the outdoor ambient temperature Ta is greater than b. When Ta>b, the refrigerant radiator is controlled to the second working state; When Ta≤b, determine whether the air conditioning system has a subcooler; When the air conditioning system does not have the subcooler, the opening degree of the first throttling element is controlled to zero, and then the refrigerant radiator is controlled to the first operating state; when the air conditioning system has the subcooler, the refrigerant radiator is controlled to the first operating state. When the air conditioning system has a subcooler, the inlet of the auxiliary refrigerant pipe of the subcooler is connected to the second end of the first throttling element, and the auxiliary refrigerant pipe is connected in series with the first throttling element.

3. The air conditioning system according to claim 2, characterized in that, The controller is configured to: When the refrigerant radiator is in the second working state, if EVB≤a%×β, or EVB>a%×β, EVB≤a%×α, and the duration of the opening degree of the first throttling element being less than or equal to a%×α is greater than or equal to τ, it is determined whether the air conditioning system has a subcooler. When the air conditioning system does not have the subcooler, the opening of the first throttling element is controlled to be zero, and then the refrigerant radiator is controlled to be in the first working state. When the air conditioning system has the subcooler, the refrigerant radiator is controlled to be in the first working state.

4. The air conditioning system according to claim 2 or 3, characterized in that, Also includes: The second temperature detection device is used to detect the temperature Tfin of the outdoor control module and is electrically connected to the controller; The controller is configured to: When the refrigerant radiator is in the second working state, when EVB>a%×α, or when EVB>a%×β, EVB≤a%×α, and the duration of the opening degree of the first throttling device being less than or equal to a%×α is less than τ, it is determined whether the temperature Tfin of the outdoor control module is less than or equal to cd and whether the temperature Tfin of the outdoor control module is greater than the sum of the ambient dew point temperature Tdp and e. When Tfin > cd, increase the opening of the first throttling element; When Tfin≤cd and Tfin>Tdp+e, the opening degree of the first throttling element remains unchanged; When Tfin≤cd and Tfin≤Tdp+e, reduce the opening of the first throttling element.

5. The air conditioning system according to claim 2, characterized in that, Also includes: The second temperature detection device is used to detect the temperature Tfin of the outdoor control module and is electrically connected to the controller; The controller is configured to: When the refrigerant radiator is in the first working state, determine whether the temperature Tfin of the outdoor control module is less than or equal to cd; When Tfin > cd, determine whether the second flow regulating valve is fully open. If the second flow regulating valve is not fully open, increase the opening degree of the second flow regulating valve. If the second flow regulating valve is fully open, determine whether the first flow regulating valve is fully closed. If the first flow regulating valve is not fully closed, decrease the opening degree of the first flow regulating valve.

6. The air conditioning system according to claim 5, characterized in that, The controller is configured to: When the first flow regulating valve is fully closed, control the first flow regulating valve and the second flow regulating valve to be fully open, and then determine whether the air conditioning system has a subcooler; When the air conditioning system does not have the subcooler, the refrigerant radiator is controlled to a second operating state, and the opening degree of the first throttling element is controlled to a%. When the air conditioning system has the subcooler, the refrigerant radiator is controlled to be in a second operating state.

7. The air conditioning system according to claim 5, characterized in that, The controller is configured to: When Tfin ≤ cd, determine whether Tfin is greater than Tdp + e. When Tfin ≤ Tdp + e, determine whether the first flow regulating valve is fully open. If the first flow regulating valve is not fully open, increase the opening of the first flow regulating valve. If the first flow regulating valve is fully open, determine whether the opening of the second flow regulating valve is less than or equal to g%. If the opening of the second flow regulating valve is not less than or equal to g%, decrease the opening of the second flow regulating valve. g ≥ 0 and g ≤ 10.

8. The air conditioning system according to claim 7, characterized in that, The controller is configured to: When the opening degree of the second flow regulating valve is less than or equal to g%, the first flow regulating valve and the second flow regulating valve are fully opened, and then it is determined whether the air conditioning system has a subcooler. When the air conditioning system does not have the subcooler, the refrigerant radiator is controlled to a second operating state, and the opening degree of the first throttling element is controlled to a%. When the air conditioning system has the subcooler, the refrigerant radiator is controlled to be in a second operating state.

9. The air conditioning system according to any one of claims 1-3, characterized in that, The outdoor unit also includes: The second commutation device includes a first interface, a second interface, a third interface, and a fourth interface; The third commutation device includes a fifth interface, a sixth interface, a seventh interface, and an eighth interface; The first interface is connected to the second end of the second flow regulating valve; the second interface is connected to the second end of the first flow regulating valve; the third interface is connected to the fifth interface; the fourth interface is connected to the first port. The sixth interface is connected to the second end of the first throttling device, and the eighth interface is connected to the second port; When the refrigerant radiator is in the first working state, the first interface and the fourth interface are connected, the second interface and the third interface are connected, the fifth interface and the eighth interface are connected, and the sixth interface and the seventh interface are connected. When the refrigerant radiator is in the second working state, the first interface and the second interface are connected, the third interface and the fourth interface are connected, the fifth interface and the sixth interface are connected, the seventh interface and the eighth interface are connected, and the seventh interface is connected to the inlet of the gas-liquid separator or the gas injection port of the compressor.

10. An air conditioning system, characterized in that, include: The outdoor unit includes a first reversing device, a compressor, an outdoor heat exchanger, an outdoor throttling device, and a liquid-side shut-off valve; The first reversing device includes a first valve port, a second valve port, a third valve port, and a fourth valve port; The compressor's air inlet is connected to the first valve port via a gas-liquid separator, and the compressor's exhaust port is connected to the third valve port. The first end of the outdoor throttling device is connected to the second valve port through the outdoor heat exchanger. The first end of the liquid-side shut-off valve is connected to the fourth valve port via an indoor heat exchanger. The outdoor unit also includes: First flow control valve and second flow control valve; First section of flow; Of the second end of the outdoor throttling device and the second end of the liquid-side shut-off valve, the first end of the first flow regulating valve and the first end of the second flow regulating valve are connected to one of them, and the second end of the first flow regulating valve and the first end of the first throttling device are connected to the other. The subcooler has an auxiliary refrigerant pipe inlet connected to the second end of the first throttling element, and the auxiliary refrigerant pipe is connected in series with the first throttling element. A refrigerant radiator is used to dissipate heat from the outdoor control module and has a first working state and a second working state. When the refrigerant radiator is in the first working state, the first port of the refrigerant radiator is connected to the second end of the second flow regulating valve, and the second port of the refrigerant radiator is connected to the second end of the first flow regulating valve; When the refrigerant radiator is in the second working state, the second end of the second flow regulating valve is connected to the second end of the first flow regulating valve, the first port is connected to the outlet of the auxiliary refrigerant pipe, and the second port is connected to the inlet of the gas-liquid separator or the gas supply port of the compressor.

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