Multi-split air conditioner and control method thereof

Abstract

The embodiment of the invention provides a multi-split air conditioner and a control method thereof, and relates to the technical field of air conditioning equipment. The multi-split air conditioner comprises a water side indoor unit; the air-side indoor unit comprises a main heat exchanger, an air-side heat exchanger and an air-side heat exchanger, an auxiliary heat exchanger; an outdoor unit; the outdoor unit includes: a control panel; a compressor; an outdoor heat exchanger; the first four-way valve is used for switching refrigerant passages of the compressor and the main heat exchanger; the second four-way valve is used for switching refrigerant passages of the compressor and the auxiliary heat exchanger; the third four-way valve is used for switching refrigerant passages of the compressor and the water side indoor unit; the method comprises the steps that on-off control is conducted on a target four-way valve based on the temperature and the dew point temperature of the control panel; the target four-way valve comprises at least one of a first four-way valve, a second four-way valve and a third four-way valve. By means of the mode, the probability of condensation risk of the base plate can be reduced in the operation process of the air conditioner.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology. More specifically, it relates to a multi-split air conditioner and its control method. Background Technology

[0002] Complex multi-split air conditioners that include both air-side indoor units (such as three-pipe indoor units) and water-side indoor units (for underfloor heating / domestic hot water) are typically used in scenarios where both air conditioning and water temperature control are required simultaneously. In such scenarios, multi-split air conditioners need to achieve coordinated control of the air-side (e.g., supply air temperature control) and the water-side (e.g., underfloor heating or domestic hot water temperature control) through complex refrigerant circulation paths.

[0003] During the operation of a multi-split air conditioner, the control board needs to be cooled to avoid affecting its lifespan. Currently, this is often achieved using a relatively low-temperature refrigerant. However, when the refrigerant temperature is low, the control board temperature will also decrease. If the ambient temperature is low and the humidity is high, condensation will form on the control board when its temperature drops below the dew point of the air. This can cause short circuits in electronic components and affect the reliability of the multi-split air conditioner. Summary of the Invention

[0004] This application provides a multi-split air conditioner and its control method to reduce the probability of condensation on the substrate during air conditioner operation.

[0005] In a first aspect, embodiments of this application provide a multi-split air conditioner, comprising:

[0006] Water-side indoor unit;

[0007] The air-side indoor unit includes:

[0008] Main heat exchanger;

[0009] Auxiliary heat exchanger;

[0010] Outdoor unit; the outdoor unit includes:

[0011] Control panel;

[0012] compressor;

[0013] Outdoor heat exchanger;

[0014] The first four-way valve is used to switch the refrigerant passage between the compressor and the main heat exchanger;

[0015] The second four-way valve is used to switch the refrigerant passage between the compressor and the auxiliary heat exchanger.

[0016] The third four-way valve is used to switch the refrigerant passage between the compressor and the water-side indoor unit;

[0017] Controller; the controller is configured to:

[0018] The target four-way valve is controlled to open based on the temperature and dew point temperature of the control panel; the target four-way valve includes at least one of a first four-way valve, a second four-way valve, and a third four-way valve.

[0019] In some embodiments, the controller is configured to:

[0020] When the temperature of the control panel is less than or equal to the dew point temperature, the conduction state of the target four-way valve is switched based on the status of the outdoor heat exchanger, the main heat exchanger, the auxiliary heat exchanger, and the water-side indoor unit.

[0021] In some embodiments, the controller is configured to:

[0022] When the outdoor heat exchanger is an evaporator, the main heat exchanger and the auxiliary heat exchanger are condensers, and the water-side indoor unit is used for heating, the conduction state of the first four-way valve is switched so that the outdoor heat exchanger is switched to a condenser and the main heat exchanger is switched to an evaporator.

[0023] In some embodiments, the controller is configured to:

[0024] When the outdoor heat exchanger is an evaporator, the main heat exchanger is a condenser, the auxiliary heat exchanger is an evaporator, and the water-side indoor unit is used for heating, the conduction states of the first four-way valve and the second four-way valve are switched so that the outdoor heat exchanger is switched to a condenser, the main heat exchanger is switched to an evaporator, and the auxiliary heat exchanger is switched to a condenser.

[0025] In some embodiments, the controller is configured to:

[0026] When the outdoor heat exchanger is an evaporator, the main heat exchanger and the auxiliary heat exchanger are condensers, and the water-side indoor unit is used for cooling, the conduction state of the first four-way valve is switched so that the outdoor heat exchanger is switched to a condenser and the main heat exchanger is switched to an evaporator.

[0027] In some embodiments, the controller is configured to:

[0028] When the outdoor heat exchanger is an evaporator, the main heat exchanger is a condenser, the auxiliary heat exchanger is an evaporator, and the water-side indoor unit is used for cooling, the conduction states of the first four-way valve and the second four-way valve are switched so that the outdoor heat exchanger is switched to a condenser, the main heat exchanger is switched to an evaporator, and the auxiliary heat exchanger is switched to a condenser.

[0029] In some embodiments, the controller is configured to:

[0030] Based on the set temperature of the air-side indoor unit, the opening degree of the control valves corresponding to the main heat exchanger and the auxiliary heat exchanger is adjusted respectively.

[0031] In some embodiments, the controller is configured to:

[0032] Determine the status of the outdoor heat exchanger;

[0033] When the outdoor heat exchanger is an evaporator, the target four-way valve is controlled to open based on the temperature of the control panel and the dew point temperature.

[0034] Secondly, embodiments of this application provide a control method for a multi-split air conditioner, the multi-split air conditioner comprising:

[0035] Water-side indoor unit;

[0036] The air-side indoor unit includes:

[0037] Main heat exchanger;

[0038] Auxiliary heat exchanger;

[0039] Outdoor unit; the outdoor unit includes:

[0040] Control panel;

[0041] compressor;

[0042] Outdoor heat exchanger;

[0043] The first four-way valve is used to switch the refrigerant passage between the compressor and the main heat exchanger;

[0044] The second four-way valve is used to switch the refrigerant passage between the compressor and the auxiliary heat exchanger.

[0045] The third four-way valve is used to switch the refrigerant passage between the compressor and the water-side indoor unit;

[0046] The method includes:

[0047] The target four-way valve is controlled to open based on the temperature and dew point temperature of the control panel; the target four-way valve includes at least one of a first four-way valve, a second four-way valve, and a third four-way valve.

[0048] Thirdly, embodiments of this application provide an electrical device, including: a processor, a transceiver, and a memory; the processor is communicatively connected to the transceiver and the memory respectively;

[0049] The memory is used to store computer programs;

[0050] The transceiver is used for communication and interaction with external devices;

[0051] The processor is configured to execute the computer program to implement the second aspect and / or various possible implementations of the second aspect.

[0052] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the second aspect and / or various possible implementations of the second aspect as described above.

[0053] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the second aspect and / or various possible implementations of the second aspect as described above.

[0054] The multi-split air conditioner and its control method provided in this application include: a water-side indoor unit; an air-side indoor unit, the air-side indoor unit including: a main heat exchanger; an auxiliary heat exchanger; an outdoor unit; the outdoor unit including: a control board; a compressor; an outdoor heat exchanger; a first four-way valve for switching the refrigerant path between the compressor and the main heat exchanger; a second four-way valve for switching the refrigerant path between the compressor and the auxiliary heat exchanger; and a third four-way valve for switching the refrigerant path between the compressor and the water-side indoor unit. The method includes: controlling the conduction of a target four-way valve based on the temperature and dew point temperature of the control board; the target four-way valve includes at least one of the first four-way valve, the second four-way valve, and the third four-way valve. In this solution, when the substrate condensation conditions are met, the first four-way valve is automatically switched so that the outdoor heat exchanger is always a condenser, ensuring that the refrigerant heat dissipation pipes cooperating with the substrate always flow with liquid refrigerant, reducing the risk of substrate condensation damage. Simultaneously, the system determines whether the second and third four-way valves need to be switched based on the indoor operating mode before the switch. By employing this method, the system no longer needs to be shut down when refrigerant condensation is possible, reducing temperature fluctuations in the air and water outlets of the multi-split air conditioner. This ensures effective refrigerant cooling while further improving user comfort and overall system reliability. Attached Figure Description

[0055] 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.

[0056] Figure 1 This application provides a structural schematic diagram of a multi-split air conditioner;

[0057] Figure 2A flowchart illustrating a control method for a multi-split air conditioner provided in this application;

[0058] Figure 3 A schematic diagram illustrating the switching process of a four-way valve in a multi-split air conditioner provided in this application;

[0059] Figure 4 A schematic diagram of the structure and refrigerant flow direction of a multi-split air conditioner provided in this application. Figure 1 ;

[0060] Figure 5 A schematic diagram of the structure and refrigerant flow direction of a multi-split air conditioner provided in this application. Figure 2 ;

[0061] Figure 6 A schematic diagram of the structure and refrigerant flow direction of a multi-split air conditioner provided in this application. Figure 3 ;

[0062] Figure 7 A schematic diagram of the structure and refrigerant flow direction of a multi-split air conditioner provided in this application. Figure 4 ;

[0063] Figure 8 A schematic diagram of the structure and refrigerant flow direction of a multi-split air conditioner provided in this application. Figure 5 ;

[0064] Figure 9 A schematic diagram of the structure and refrigerant flow direction of a multi-split air conditioner provided in this application. Figure 6 ;

[0065] Figure 10 This is a schematic diagram of the control device for a multi-split air conditioner provided in this application.

[0066] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0067] 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.

[0068] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0069] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclusively include, for example, a product or device that includes a series of components is not necessarily limited to those that are explicitly listed, but may include other components that are not explicitly listed or that are inherent to such product or device.

[0070] The terms "first" and "second" are configured for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, 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.

[0071] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0072] Figure 1 This is a schematic diagram of the structure of a multi-split air conditioner provided in an embodiment of this application, as shown below. Figure 1 As shown, a multi-split air conditioner includes:

[0073] Outdoor unit 100, multiple wind-side indoor units 200 and water-side indoor units 300.

[0074] The outdoor unit 100 includes a compressor 1, an outdoor heat exchanger 2, a gas-liquid separator 3, a control board 4, a plate heat exchanger 5, and multiple four-way valves. For example, four-way valve Y212, four-way valve Y213, and four-way valve Y214.

[0075] Each air-side indoor unit 200 includes a main heat exchanger and an auxiliary heat exchanger. It should be understood that... Figure 1 The diagram shows two wind-side indoor units 200. The number of wind-side indoor units is not limited in this embodiment.

[0076] refer to Figure 1 The outdoor unit 100 is connected to the water-side indoor unit 300 through the plate heat exchanger 5 therein, and heat exchange is realized between the outdoor unit 100 and the water-side indoor unit 300 through the plate heat exchanger 5, so that the water-side indoor unit 300 can regulate the water temperature.

[0077] The outdoor unit 100 is connected in parallel to multiple air-side indoor units 200 through pipes. The refrigerant circulates between the outdoor unit 100 and the air-side indoor units 200 to provide the air-side indoor units 200 with the energy source for heating or cooling.

[0078] The following explains the refrigerant flow direction in a multi-split air conditioner.

[0079] For the air-side indoor unit 200, the refrigerant flow direction is as follows:

[0080] The refrigerant flowing out of compressor 1 passes through four-way valve Y212 and then flows to outdoor heat exchanger 2. The refrigerant flowing out of outdoor heat exchanger 2 flows through base plate 4 and then flows to the main heat exchanger and auxiliary heat exchanger through the pipeline between base plate 4 and the main heat exchanger and auxiliary heat exchanger.

[0081] For the main heat exchanger, the refrigerant flowing out of the main heat exchanger passes through the four-way valve Y212, flows back to the gas-liquid separator 3, and then flows back to the compressor 1, thus realizing the circulation of refrigerant.

[0082] For the auxiliary heat exchanger, the refrigerant flowing out of the auxiliary heat exchanger passes through the four-way valve Y213, flows back to the gas-liquid separator 3, and then flows back to the compressor 1, thus realizing the circulation of refrigerant.

[0083] For the water-side indoor unit 300, the refrigerant flow direction is as follows:

[0084] The refrigerant flowing out from compressor 1 passes through four-way valve Y214 and then through plate heat exchanger 5 via the loop between four-way valve Y214 and plate heat exchanger 5 to exchange heat with the water circulating in the water-side indoor unit 300.

[0085] The refrigerant flowing out of the plate heat exchanger 5 returns to the pipe connecting the base plate 4 and the air-side indoor unit 200, thus realizing the circulation of the refrigerant.

[0086] During the refrigerant flow process described above, the refrigerant can be used to cool the control board (also known as the base plate). However, when the dew point temperature of the air is lower than the temperature of the control board, water droplets will condense on the control board (i.e., condensation occurs), causing short circuits in electronic components and affecting the reliability of multi-split air conditioners.

[0087] Currently, most systems use a shutdown alarm to prevent the low-temperature refrigerant from flowing within the circulation system. The system is then restarted only when conditions for condensation prevention are met. This method causes fluctuations in the air and water temperatures of multi-split air conditioners, making it difficult to reach the user's set temperature and impacting user comfort.

[0088] In view of this, embodiments of this application provide a multi-split air conditioner and its control method, which dynamically adjusts the switching logic of the four-way valve according to the operating modes (such as heating / cooling, heating and dehumidification, etc.) of the air-side indoor unit, the water-side indoor unit and the outdoor unit. By dynamically switching the four-way valve to control the refrigerant flow, the outdoor heat exchanger is always in condenser mode, thereby increasing the refrigerant temperature and reducing the risk of substrate condensation without shutting down the system.

[0089] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be implemented independently or in combination with each other. The same or similar concepts or processes may not be described again in some embodiments.

[0090] Figure 2 This is a flowchart illustrating a control method for a multi-split air conditioner provided in an embodiment of this application. The execution entity in this embodiment can be the controller or control module of the multi-split air conditioner, such as... Figure 2 As shown, it includes:

[0091] S201. Determine the status of the outdoor heat exchanger.

[0092] In some embodiments, during operation, the heat exchanger of a multi-split air conditioner maintains different states depending on the tasks performed by the air conditioner. For example, when performing a cooling task, the outdoor heat exchanger is in a condensing state, while the heat exchanger of the air-side indoor unit is in an evaporating state. When performing a heating task, the outdoor heat exchanger is in an evaporating state, while the heat exchanger of the air-side indoor unit is in a condensing state.

[0093] A heat exchanger in a condensing state can be called a condenser, and a heat exchanger in an evaporating state can be called an evaporator.

[0094] In some embodiments, the controller can determine the state of the outdoor heat exchanger based on the currently executed function. For example, when performing a cooling task, the outdoor heat exchanger is in a condensing state, i.e., the outdoor heat exchanger is a condenser. When performing a heating task, the outdoor heat exchanger is in an evaporating state, i.e., the outdoor heat exchanger is an evaporator.

[0095] S202. When the outdoor heat exchanger is an evaporator, obtain the temperature of the control panel and the dew point temperature.

[0096] In some embodiments, dew point temperature may refer to the temperature at which water vapor in the air condenses into liquid water.

[0097] When the outdoor heat exchanger is a condenser, the multi-split air conditioner performs the cooling task. The refrigerant flowing out of the condenser is a liquid refrigerant in a high-temperature and high-pressure state, and the temperature of this refrigerant is usually higher than the dew point temperature.

[0098] When the refrigerant flows through the control board to cool it down, the temperature of the control board usually does not fall below the dew point temperature, and condensation will not occur on the control board. Therefore, when the outdoor heat exchanger is a condenser, there is virtually no risk of condensation on the substrate.

[0099] When the outdoor heat exchanger is an evaporator, the refrigerant flowing out of the evaporator is a low-temperature, low-pressure gaseous refrigerant. When this refrigerant flows through the control board to cool and dissipate heat, the temperature of the control board may drop below the dew point temperature. When the temperature of the control board is below the dew point temperature, there is a risk of condensation, therefore, condensation risk control is required.

[0100] In some embodiments, the temperature of the control board can be obtained based on a temperature sensor installed on the control board. The dew point temperature can be determined based on the current ambient temperature and humidity, according to predefined rules and algorithms.

[0101] Optionally, since the dew point temperature is always less than or equal to the ambient temperature, the relative humidity will reach 100% when the two are equal. To ensure the reliability of condensation prediction, the ambient temperature can be used as the dew point temperature.

[0102] S203. When the temperature of the control panel is less than or equal to the dew point temperature, switch the conduction state of the target four-way valve based on the status of the air-side indoor unit and the water-side indoor unit.

[0103] In some embodiments, if the temperature of the control board is greater than the dew point temperature, the control board will not have a risk of condensation and there is no need to control the condensation risk.

[0104] In some embodiments, reference Figure 3 When the temperature (Tf) of the control panel is lower than the dew point temperature (Ta), there is a high risk of condensation on the control panel. In this case, based on the status of the air-side and water-side indoor units, the conduction state of the target four-way valve is switched to control condensation. The target four-way valve includes at least one of a first four-way valve, a second four-way valve, and a third four-way valve.

[0105] The status of the air-side indoor unit can refer to the status of the main and auxiliary heat exchangers within it. For example, whether the main and auxiliary heat exchangers are condensers or evaporators. The status of the water-side indoor unit can refer to whether it is used for heating or cooling.

[0106] The following is combined Figures 4-9 The process of switching the conduction state of the target four-way valve based on the status of the air-side indoor unit and the water-side indoor unit to control condensation is explained.

[0107] In some embodiments, the states of the wind-side indoor unit and the water-side indoor unit may include the following situations.

[0108] Scenario 1: The outdoor heat exchanger is an evaporator, the main heat exchanger and auxiliary heat exchanger are condensers, and the water-side indoor unit is used for heating.

[0109] Figure 4 This diagram illustrates the refrigerant flow direction when the outdoor heat exchanger is an evaporator, the main heat exchanger and auxiliary heat exchanger are condensers, and the water-side indoor unit is used for heating. Figure 4 As shown:

[0110] For the water-side indoor unit 300, the refrigerant flow direction is as follows:

[0111] The refrigerant flowing out from compressor 1 passes through four-way valve Y214 and then through plate heat exchanger 5 via the loop between four-way valve Y214 and plate heat exchanger 5 to exchange heat with the water circulating in the water-side indoor unit 300.

[0112] The refrigerant flowing out of the plate heat exchanger 5 flows through the base plate 4 and then back to the evaporator 2. The refrigerant flowing out of the evaporator 2 flows through the four-way valve Y212 and then to the gas-liquid separator 3 and then back to the compressor 1, thus realizing the circulation of the refrigerant.

[0113] For the air-side indoor unit 200, the refrigerant flow direction is as follows:

[0114] The refrigerant flowing out of compressor 1 flows in two directions: one to four-way valve Y212 and the other to four-way valve Y213.

[0115] The refrigerant flowing to the four-way valve Y212 flows to the main heat exchanger through the pipe between the four-way valve Y212 and the main heat exchanger. The refrigerant flowing out of the main heat exchanger flows back to the base plate, and then flows back to the compressor 1 after passing through the evaporator 2, the four-way valve Y212 and the gas-liquid separator 3, thus realizing the circulation of refrigerant.

[0116] The refrigerant flowing to the four-way valve Y213 flows through the pipe between the four-way valve Y213 and the auxiliary heat exchanger. After flowing out of the auxiliary heat exchanger, the refrigerant flows back to the base plate, and then flows back to the compressor 1 through the evaporator 2, the four-way valve Y212 and the gas-liquid separator 3, thus realizing the circulation of the refrigerant.

[0117] In the state shown in Case 1, the conduction state of the first four-way valve (four-way valve Y212) can be switched, while the other four-way valves remain inactive, so that the outdoor heat exchanger is switched to the condenser, the main heat exchanger is switched to the evaporator, and the states of the auxiliary heat exchanger and the water-side indoor unit remain unchanged.

[0118] Figure 5 This is a schematic diagram illustrating the refrigerant flow after the state switch, as shown below. Figure 5 As shown:

[0119] For the air-side indoor unit 200, the refrigerant flow direction is as follows:

[0120] The refrigerant flowing out of compressor 1 flows in two directions: one to four-way valve Y212 and the other to four-way valve Y213.

[0121] The refrigerant flowing to the four-way valve Y212 passes through the evaporator 2 and then flows to the base plate. The refrigerant flowing out of the base plate flows into the main heat exchanger through the pipe between the base plate and the main heat exchanger. The refrigerant flowing out of the main heat exchanger passes through the four-way valve Y212, then passes through the gas-liquid separator 3 and flows back to the compressor 1, thus realizing the circulation of the refrigerant.

[0122] The refrigerant flowing to the four-way valve Y213 flows to the auxiliary heat exchanger after passing through the four-way valve Y213. The refrigerant flowing out of the auxiliary heat exchanger flows into the main heat exchanger, and the refrigerant flowing out of the main heat exchanger flows back to the compressor 1 after passing through the four-way valve Y212 and the gas-liquid separator 3, thus realizing the circulation of refrigerant.

[0123] For the water-side indoor unit 300, the refrigerant flow direction is as follows:

[0124] The refrigerant flowing out from compressor 1 passes through four-way valve Y214 and then through plate heat exchanger 5 via the loop between four-way valve Y214 and plate heat exchanger 5 to exchange heat with the water circulating in the water-side indoor unit 300.

[0125] The refrigerant flowing out of the plate heat exchanger 5 returns to the pipeline between the plate and the main heat exchanger, and the refrigerant is circulated through the refrigerant loop of the main heat exchanger.

[0126] Depend on Figure 4 and Figure 5 As can be seen from the refrigerant flow direction, after the four-way valve Y212 switches its on / off state, the flow direction of the refrigerant flowing through the outdoor heat exchanger and the main heat exchanger is reversed compared to before the switch, thus switching the outdoor heat exchanger to a condenser and the main heat exchanger to an evaporator. The refrigerant flow direction through the auxiliary heat exchanger and the water-side indoor unit remains unchanged, and the states of the auxiliary heat exchanger and the water-side indoor unit remain unchanged.

[0127] Because the status of the outdoor heat exchanger was switched, the temperature of the refrigerant flowing from the outdoor heat exchanger to the substrate was significantly increased, thus effectively avoiding the risk of condensation due to excessively low substrate temperature.

[0128] exist Figure 5 As shown, the refrigerant flows downwards. For the air-side indoor unit, the main heat exchanger is the evaporator and the auxiliary heat exchanger is the condenser, used for cooling and heating respectively. In this case, the refrigerant flow distribution between the main heat exchanger and the auxiliary heat exchanger can be adjusted by adjusting the valve opening of the corresponding control valves (e.g., EVI and EVR) of the main heat exchanger and the auxiliary heat exchanger, thereby maintaining the indoor temperature at the set temperature.

[0129] In some embodiments, PID control, fuzzy logic control, or other methods can be used to adjust the opening of the control valves corresponding to the main heat exchanger and the auxiliary heat exchanger based on the indoor set temperature and the current opening of the control valve.

[0130] Scenario 2: The outdoor heat exchanger is an evaporator, the main heat exchanger is a condenser, the auxiliary heat exchanger is an evaporator, and the water-side indoor unit is used for heating.

[0131] Figure 6 This is a schematic diagram of the refrigerant flow under scenario 2, as shown below. Figure 6 As shown:

[0132] For the air-side indoor unit 200, the refrigerant flow direction is as follows:

[0133] The refrigerant flowing out of compressor 1 flows to the four-way valve Y212, and then flows to the main heat exchanger through the pipeline between the four-way valve Y212 and the main heat exchanger. The refrigerant flowing out of the main heat exchanger is divided into two paths: one path flows into the auxiliary heat exchanger, and the other path flows to the base plate.

[0134] The refrigerant flowing to the substrate flows out of the substrate and into the evaporator 2. The refrigerant flowing out of the evaporator 2 flows back to the compressor 1 after passing through the four-way valve Y212 and the gas-liquid separator 3, thus realizing the circulation of the refrigerant.

[0135] The refrigerant flowing to the auxiliary heat exchanger flows out of the auxiliary heat exchanger, passes through the four-way valve Y213 and the gas-liquid separator 3, and then flows back to the compressor 1, realizing the circulation of the refrigerant.

[0136] For the water-side indoor unit 300, the refrigerant flow direction is as follows:

[0137] The refrigerant flowing out from compressor 1 passes through four-way valve Y214 and then through plate heat exchanger 5 via the loop between four-way valve Y214 and plate heat exchanger 5 to exchange heat with the water circulating in the water-side indoor unit 300.

[0138] The refrigerant flowing out of the plate heat exchanger 5 returns to the pipeline between the plate and the main heat exchanger, and the refrigerant is circulated through the refrigerant loop of the main heat exchanger.

[0139] In the state shown in Case 2, the conduction state of the first four-way valve (Y212) and the second four-way valve (Y213) can be switched, while the third four-way valve (Y213) remains inactive, so that the outdoor heat exchanger switches to the condenser, the main heat exchanger switches to the evaporator, and the auxiliary heat exchanger switches to the condenser, while the state of the water-side indoor unit remains unchanged.

[0140] In the state shown in Case 2, after switching the on / off states of the first four-way valve (Y212) and the second four-way valve (Y213), the refrigerant flow diagram is as follows: Figure 5 same.

[0141] Depend on Figure 5 and Figure 6 It can be seen that after the conduction states of four-way valves Y212 and Y213 are switched, the flow direction of the refrigerant flowing through the outdoor heat exchanger, main heat exchanger, and auxiliary heat exchanger is reversed compared to before the switch. This reverses the flow, turning the outdoor heat exchanger into a condenser, the main heat exchanger into an evaporator, and the auxiliary heat exchanger into a condenser. The refrigerant flow direction through the water-side indoor unit remains unchanged, and the state of the water-side indoor unit remains the same.

[0142] After the switch, the temperature of the refrigerant flowing to the substrate is significantly increased, effectively preventing condensation risks caused by excessively low substrate temperature. Simultaneously, the opening of control valves EVI and EVR can be adjusted in tandem with the set temperatures of the air-side indoor unit and the water-side unit, reducing fluctuations in the outlet air temperature of the air-side indoor unit and ensuring effective heating and dehumidification on the air-side and heating on the water-side. The method for adjusting the opening of control valves EVI and EVR is similar to that described above and will not be repeated here.

[0143] Scenario 3: The outdoor heat exchanger is an evaporator, the main heat exchanger and the auxiliary heat exchanger are condensers, and the water-side indoor unit is used for cooling.

[0144] Figure 7 This is a schematic diagram of the refrigerant flow under condition 3, as shown below. Figure 7 As shown:

[0145] For the air-side indoor unit 200, the refrigerant flow direction is as follows:

[0146] The refrigerant flowing out of compressor 1 flows in two directions: one to four-way valve Y212 and the other to four-way valve Y213.

[0147] The refrigerant flowing to the four-way valve Y212 enters the main heat exchanger via the pipeline between the four-way valve Y212 and the main heat exchanger. The refrigerant flowing out of the main heat exchanger flows to the base plate. The refrigerant flowing out of the base plate passes through the evaporator 2, the four-way valve Y212, and the gas-liquid separator 3 before returning to the compressor 1, thus realizing the refrigerant circulation.

[0148] The refrigerant flowing to the four-way valve Y213 flows into the auxiliary heat exchanger via the pipeline between the four-way valve Y213 and the main heat exchanger. The refrigerant flowing out of the auxiliary heat exchanger flows to the base plate. The refrigerant flowing out of the base plate passes through the evaporator 2, the four-way valve Y212, and the gas-liquid separator 3 before returning to the compressor 1, thus realizing the refrigerant circulation.

[0149] For the water-side indoor unit 300, the refrigerant flow direction is as follows:

[0150] The refrigerant flowing out of the main heat exchanger and the auxiliary heat exchanger is divided into two paths: one flows to the base plate and the other flows to the plate heat exchanger 5. The refrigerant flowing through the plate heat exchanger 5 exchanges heat with the water circulating in the water-side indoor unit 300.

[0151] The refrigerant flowing out of the plate heat exchanger 5 flows back through the four-way valve Y214 and then into the gas-liquid separator 3, before returning to the compressor 1, thus realizing the circulation of the refrigerant.

[0152] In the state shown in Case 3, the conduction state of the first four-way valve (four-way valve Y212) can be switched, while the other four-way valves remain inactive, so that the outdoor heat exchanger is switched to the condenser, the main heat exchanger is switched to the evaporator, and the states of the auxiliary heat exchanger and the water-side indoor unit remain unchanged.

[0153] Figure 8 This is a schematic diagram illustrating the refrigerant flow after the state switch, as shown below. Figure 8 As shown:

[0154] For the air-side indoor unit 200, the refrigerant flow direction is as follows:

[0155] The refrigerant flowing out of compressor 1 flows in two directions: one to four-way valve Y212 and the other to four-way valve Y213.

[0156] The refrigerant flowing to the four-way valve Y212 passes through the evaporator 2 and then flows to the base plate. The refrigerant flowing out of the base plate flows into the main heat exchanger through the pipe between the base plate and the main heat exchanger. The refrigerant flowing out of the main heat exchanger passes through the four-way valve Y212, then passes through the gas-liquid separator 3 and flows back to the compressor 1, thus realizing the circulation of the refrigerant.

[0157] The refrigerant flowing to the four-way valve Y213 flows to the auxiliary heat exchanger after passing through the four-way valve Y213. The refrigerant flowing out of the auxiliary heat exchanger flows into the main heat exchanger, and the refrigerant flowing out of the main heat exchanger flows back to the compressor 1 after passing through the four-way valve Y212 and the gas-liquid separator 3, thus realizing the circulation of refrigerant.

[0158] For the water-side indoor unit 300, the refrigerant flow direction is as follows:

[0159] The refrigerant flowing out of the substrate is divided into two paths: one flows to the main heat exchanger and the other flows to the plate heat exchanger 5. The refrigerant flowing through the plate heat exchanger 5 exchanges heat with the water circulating in the water-side indoor unit 300.

[0160] The refrigerant flowing out of the plate heat exchanger 5 flows back through the four-way valve Y214 and then into the gas-liquid separator 3, before returning to the compressor 1, thus realizing the circulation of the refrigerant.

[0161] Depend on Figure 7 and Figure 8It can be seen that after the four-way valve Y212 switches its conduction state, the flow direction of the refrigerant flowing through the outdoor heat exchanger and the main heat exchanger is reversed compared to before the switch, thus switching the outdoor heat exchanger to a condenser and the main heat exchanger to an evaporator. The flow direction of the refrigerant flowing through the auxiliary heat exchanger and the water-side indoor unit remains unchanged, and the state of the water-side indoor unit remains unchanged.

[0162] After the switch, the temperature of the refrigerant flowing to the substrate is significantly increased, effectively preventing condensation risks caused by excessively low substrate temperature. Simultaneously, the opening of control valves EVI and EVR can be adjusted in tandem with the set temperatures of the air-side indoor unit and the water-side unit, reducing fluctuations in the outlet air temperature of the air-side indoor unit and ensuring effective heating and dehumidification on the air-side and heating on the water-side. The method for adjusting the opening of control valves EVI and EVR is similar to that described above and will not be repeated here.

[0163] Scenario 4: The outdoor heat exchanger is an evaporator, the main heat exchanger is a condenser, the auxiliary heat exchanger is an evaporator, and the water-side indoor unit is used for cooling.

[0164] Figure 9 This is a schematic diagram of the refrigerant flow under condition 4, as shown below. Figure 9 As shown:

[0165] For the air-side indoor unit 200, the refrigerant flow direction is as follows:

[0166] The refrigerant flowing out of compressor 1 flows to the four-way valve Y212, and then flows to the main heat exchanger through the pipeline between the four-way valve Y212 and the main heat exchanger. The refrigerant flowing out of the main heat exchanger is divided into two paths: one path flows into the auxiliary heat exchanger, and the other path flows to the base plate.

[0167] The refrigerant flowing to the substrate flows out of the substrate and into the evaporator 2. The refrigerant flowing out of the evaporator 2 flows back to the compressor 1 after passing through the four-way valve Y212 and the gas-liquid separator 3, thus realizing the circulation of the refrigerant.

[0168] The refrigerant flowing to the auxiliary heat exchanger flows out of the auxiliary heat exchanger, passes through the four-way valve Y213 and the gas-liquid separator 3, and then flows back to the compressor 1, realizing the circulation of the refrigerant.

[0169] For the water-side indoor unit 300, the refrigerant flow direction is as follows:

[0170] The refrigerant flowing out from compressor 1 passes through four-way valve Y214 and then through plate heat exchanger 5 via the loop between four-way valve Y214 and plate heat exchanger 5 to exchange heat with the water circulating in the water-side indoor unit 300.

[0171] The refrigerant flowing out of the plate heat exchanger 5 returns to the pipeline between the plate and the main heat exchanger, and the refrigerant is circulated through the refrigerant loop of the main heat exchanger.

[0172] In the state shown in scenario 4, the conduction states of the first four-way valve (Y212) and the second four-way valve (Y213) can be switched, while the third four-way valve (Y213) remains inactive, so that the outdoor heat exchanger switches to the condenser, the main heat exchanger switches to the evaporator, the auxiliary heat exchanger switches to the condenser, and the state of the water-side indoor unit remains unchanged.

[0173] In the state shown in scenario 4, after switching the on / off states of the first four-way valve (Y212) and the second four-way valve (Y213), the refrigerant flow diagram is as follows: Figure 5 same.

[0174] Depend on Figure 5 and Figure 9 It can be seen that after the conduction states of four-way valves Y212 and Y213 are switched, the flow direction of the refrigerant flowing through the outdoor heat exchanger, main heat exchanger, and auxiliary heat exchanger is reversed compared to before the switch. This reverses the flow, turning the outdoor heat exchanger into a condenser, the main heat exchanger into an evaporator, and the auxiliary heat exchanger into a condenser. The refrigerant flow direction through the water-side indoor unit remains unchanged, and the state of the water-side indoor unit remains the same.

[0175] After the switch, the temperature of the refrigerant flowing to the substrate is significantly increased, effectively preventing condensation risks caused by excessively low substrate temperature. Simultaneously, the opening of control valves EVI and EVR can be adjusted in tandem with the set temperatures of the air-side indoor unit and the water-side unit, reducing fluctuations in the outlet air temperature of the air-side indoor unit and ensuring effective heating and dehumidification on the air-side and heating on the water-side. The method for adjusting the opening of control valves EVI and EVR is similar to that described above and will not be repeated here.

[0176] In summary, the multi-split air conditioner and its control method provided in this application automatically switch the first four-way valve to ensure that the outdoor heat exchanger is always a condenser when the conditions for potential condensation on the substrate are met. This ensures that the refrigerant heat dissipation pipeline, which is compatible with the substrate, always flows through the liquid refrigerant, reducing the risk of substrate damage due to condensation. Simultaneously, the system determines whether the second and third four-way valves should switch based on the indoor operating mode before the switch. Through this method, when refrigerant condensation is possible, the system no longer needs to be shut down, reducing temperature fluctuations in the air and water outlets of the multi-split air conditioner. This ensures effective refrigerant heat dissipation while further improving user comfort and overall system reliability.

[0177] Based on the above embodiments, this application also provides a control device for a multi-split air conditioner.

[0178] Figure 10 This is a schematic diagram of the structure of a control device for a multi-split air conditioner provided in an embodiment of this application, as shown below. Figure 10 As shown, it includes:

[0179] The determination module 101 is used to determine the status of the outdoor heat exchanger.

[0180] The acquisition module 102 is used to acquire the temperature and dew point temperature of the control panel when the outdoor heat exchanger is an evaporator.

[0181] The switching module 103 is used to switch the conduction state of the target four-way valve based on the status of the air-side indoor unit and the water-side indoor unit when the temperature of the control board is less than or equal to the dew point temperature.

[0182] In some embodiments, the switching module 103 is used to switch the conduction state of the first four-way valve when the outdoor heat exchanger is an evaporator, the main heat exchanger and the auxiliary heat exchanger are condensers, and the water-side indoor unit is used for heating, so that the outdoor heat exchanger is switched to a condenser and the main heat exchanger is switched to an evaporator.

[0183] In some embodiments, the switching module 103 is used to switch the conduction state of the first four-way valve and the second four-way valve when the outdoor heat exchanger is an evaporator, the main heat exchanger is a condenser, the auxiliary heat exchanger is an evaporator, and the water-side indoor unit is used for heating, so that the outdoor heat exchanger is switched to a condenser, the main heat exchanger is switched to an evaporator, and the auxiliary heat exchanger is switched to a condenser.

[0184] In some embodiments, the switching module 103 is used to switch the conduction state of the first four-way valve when the outdoor heat exchanger is an evaporator, the main heat exchanger and the auxiliary heat exchanger are condensers, and the water-side indoor unit is used for cooling, so that the outdoor heat exchanger is switched to a condenser and the main heat exchanger is switched to an evaporator.

[0185] In some embodiments, the switching module 103 is used to switch the conduction state of the first four-way valve and the second four-way valve when the outdoor heat exchanger is an evaporator, the main heat exchanger is a condenser, the auxiliary heat exchanger is an evaporator, and the water-side indoor unit is used for cooling, so that the outdoor heat exchanger is switched to a condenser, the main heat exchanger is switched to an evaporator, and the auxiliary heat exchanger is switched to a condenser.

[0186] In some embodiments, the switching module 103 is used to adjust the opening degree of the control valves corresponding to the main heat exchanger and the auxiliary heat exchanger based on the set temperature of the air-side indoor unit.

[0187] The control device for multi-split air conditioners provided in this application embodiment can execute the control method for multi-split air conditioners shown in any of the above embodiments. Its principle and technical effect are similar, and will not be described again here.

[0188] The control device for an air-cooled unit provided in this application embodiment can execute the control method for the air-cooled unit shown in any of the above embodiments. Its principle and technical effect are similar, and will not be described again here.

[0189] This application also provides an electronic device, which may include a transceiver, a processor, and a memory. This electronic device may be a controller as described in any of the above embodiments.

[0190] The processor executes computer execution instructions stored in memory, causing the processor to perform the schemes in the above embodiments. The processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0191] The memory is connected to the processor via the system bus and communicates with it. The memory is used to store computer program instructions.

[0192] A transceiver can perform the tasks of receiving and sending data and instructions.

[0193] Optionally, the electronic device may also include a communication interface to communicate and interact with external or internal devices, such as client devices (e.g., mobile phones, tablets). In specific implementations, if the communication interface, memory, and processor are implemented independently, they can be interconnected via a bus to complete communication with each other.

[0194] The system bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The system bus can be divided into address bus, data bus, control bus, etc. For ease of representation, only one thick line is used in the diagram, but this does not indicate that there is only one bus or one type of bus. Transceivers are used to enable communication between database access devices and other computers (e.g., clients, read-write libraries, and read-only libraries). Memory may include random access memory (RAM) and may also include non-volatile memory.

[0195] Optionally, in a specific implementation, if the communication interface, memory, and processor are integrated on a single chip, then the communication interface, memory, and processor can communicate through an internal interface.

[0196] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0197] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.

[0198] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0199] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0200] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0201] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0202] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0203] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0204] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0205] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A multi-split air conditioner, characterized in that, include: Water-side indoor unit; The air-side indoor unit includes: Main heat exchanger; Auxiliary heat exchanger; Outdoor unit; the outdoor unit includes: Control panel; compressor; Outdoor heat exchanger; The first four-way valve is used to switch the refrigerant passage between the compressor and the main heat exchanger; The second four-way valve is used to switch the refrigerant passage between the compressor and the auxiliary heat exchanger. The third four-way valve is used to switch the refrigerant passage between the compressor and the water-side indoor unit; Controller; the controller is configured to: The target four-way valve is controlled to open based on the temperature and dew point temperature of the control panel; the target four-way valve includes at least one of a first four-way valve, a second four-way valve, and a third four-way valve.

2. The multi-split air conditioner according to claim 1, characterized in that, The controller is configured to: When the temperature of the control panel is less than or equal to the dew point temperature, the conduction state of the target four-way valve is switched based on the status of the outdoor heat exchanger, the main heat exchanger, the auxiliary heat exchanger, and the water-side indoor unit.

3. The multi-split air conditioner according to claim 2, characterized in that, The controller is configured to: When the outdoor heat exchanger is an evaporator, the main heat exchanger and the auxiliary heat exchanger are condensers, and the water-side indoor unit is used for heating, the conduction state of the first four-way valve is switched so that the outdoor heat exchanger is switched to a condenser and the main heat exchanger is switched to an evaporator.

4. The multi-split air conditioner according to claim 2, characterized in that, The controller is configured to: When the outdoor heat exchanger is an evaporator, the main heat exchanger is a condenser, the auxiliary heat exchanger is an evaporator, and the water-side indoor unit is used for heating, the conduction states of the first four-way valve and the second four-way valve are switched so that the outdoor heat exchanger is switched to a condenser, the main heat exchanger is switched to an evaporator, and the auxiliary heat exchanger is switched to a condenser.

5. The multi-split air conditioner according to claim 2, characterized in that, The controller is configured to: When the outdoor heat exchanger is an evaporator, the main heat exchanger and the auxiliary heat exchanger are condensers, and the water-side indoor unit is used for cooling, the conduction state of the first four-way valve is switched so that the outdoor heat exchanger is switched to a condenser and the main heat exchanger is switched to an evaporator.

6. The multi-split air conditioner according to claim 2, characterized in that, The controller is configured to: When the outdoor heat exchanger is an evaporator, the main heat exchanger is a condenser, the auxiliary heat exchanger is an evaporator, and the water-side indoor unit is used for cooling, the conduction states of the first four-way valve and the second four-way valve are switched so that the outdoor heat exchanger is switched to a condenser, the main heat exchanger is switched to an evaporator, and the auxiliary heat exchanger is switched to a condenser.

7. The multi-split air conditioner according to any one of claims 3-6, characterized in that, The controller is configured to: Based on the set temperatures of the air-side indoor unit and the water-side indoor unit, the opening degrees of the control valves corresponding to the main heat exchanger and the auxiliary heat exchanger are adjusted respectively.

8. The multi-split air conditioner according to any one of claims 1-6, characterized in that, The controller is configured to: Determine the status of the outdoor heat exchanger; When the outdoor heat exchanger is an evaporator, the target four-way valve is controlled to open based on the temperature of the control panel and the dew point temperature.

9. A control method for a multi-split air conditioner, characterized in that, The multi-split air conditioner includes: Water-side indoor unit; The air-side indoor unit includes: Main heat exchanger; Auxiliary heat exchanger; Outdoor unit; the outdoor unit includes: Control panel; compressor; Outdoor heat exchanger; The first four-way valve is used to switch the refrigerant passage between the compressor and the main heat exchanger; The second four-way valve is used to switch the refrigerant passage between the compressor and the auxiliary heat exchanger. The third four-way valve is used to switch the refrigerant passage between the compressor and the water-side indoor unit; The method includes: The target four-way valve is controlled to open based on the temperature and dew point temperature of the control panel; the target four-way valve includes at least one of a first four-way valve, a second four-way valve, and a third four-way valve.

10. The method according to claim 9, characterized in that, The control of the target four-way valve based on the temperature and dew point temperature of the control board includes: When the temperature of the control panel is less than or equal to the dew point temperature, the conduction state of the target four-way valve is switched based on the status of the outdoor heat exchanger, the main heat exchanger, the auxiliary heat exchanger, and the water-side indoor unit.

Images