Multi-connected air conditioning system

Abstract

The application discloses a multi-connected air conditioner system, and relates to the technical field of air conditioners. The multi-connected air conditioner system comprises an outdoor unit, an indoor unit, an alternating current circuit, a direct current circuit and a first relay. The indoor unit comprises an indoor heat exchanger, an indoor expansion valve and a main control panel. The indoor heat exchanger is used for heat exchange with indoor air. The indoor expansion valve is used for throttling the refrigerant flowing into or out of the indoor heat exchanger. The main control panel is used for controlling the opening degree of the indoor expansion valve. The alternating current circuit is connected to the main control panel and is used for supplying alternating current to the main control panel. The direct current circuit is connected to the main control panel and is used for supplying direct current to the main control panel. The first relay is arranged on the direct current circuit and is used for controlling the on-off of the direct current circuit. When the alternating current circuit is turned on, the first relay is disconnected. When the alternating current circuit is turned off, the first relay is closed, so that the direct current circuit supplies power to the main control panel, and the main control panel can timely and effectively control the reset of the indoor expansion valve, thereby closing the indoor unit.

Description

Technical Field

[0001] This application relates to the technical field of air conditioning, and more particularly to multi-split air conditioning systems. Background Technology

[0002] A multi-split air conditioning system is an air conditioning system that uses refrigerant as a medium and connects multiple indoor units through one outdoor unit to achieve cooling or heating. Utilizing inverter technology and an electronic expansion valve, it can automatically adjust the refrigerant flow according to the load of each room, allowing for independent temperature control in different areas. It combines the efficiency of central air conditioning with the flexibility of split air conditioning, making it suitable for scenarios with personalized temperature control needs.

[0003] In some multi-split air conditioning systems, each indoor unit is powered on and off independently, so a power outage in one indoor unit does not affect the normal operation of the others. Examples include multi-split air conditioning systems used in hotels or apartments. When an indoor unit suddenly loses power during operation, because the electronic expansion valve remains open and the outdoor unit and other indoor units continue to operate normally, the refrigerant continues to flow through that indoor unit in a meaningless cooling or heating cycle, resulting in significant energy waste and reducing the overall energy efficiency ratio of the air conditioning system. Utility Model Content

[0004] To address the shortcomings of related technologies, this application provides a multi-split air conditioning system that, when the AC circuit is disconnected, uses an additional DC circuit to power the main control board, enabling the main control board to promptly and effectively control the indoor expansion valve to reset, thereby shutting down the indoor unit.

[0005] This application provides a multi-split air conditioning system, including:

[0006] Outdoor unit;

[0007] Indoor unit, the indoor unit includes:

[0008] Indoor heat exchanger, used for exchanging heat with indoor air;

[0009] Indoor expansion valve, used to throttle the refrigerant flowing into or out of the indoor heat exchanger;

[0010] The main control board is used to control the opening degree of the indoor expansion valve;

[0011] The AC circuit is connected to the main control board and is used to supply AC power to the main control board.

[0012] The power conversion module is used to convert AC power into DC power. The input terminal of the power conversion module is connected to the AC power source, and the output terminal of the power conversion module is connected to the DC circuit. The DC circuit is connected to the main control board to supply DC power to the main control board.

[0013] The first relay, connected in series in the DC circuit, is used to control the on / off state of the DC circuit;

[0014] When the AC circuit is on, the first relay is off; when the AC circuit is off, the first relay is off, and the expansion valve in the control room of the main control board is reset.

[0015] In this technical solution, an AC circuit provides AC power to the main control board, ensuring the indoor unit operates normally. A DC circuit provides DC power to the main control board when the AC circuit is disconnected, enabling the main control board to reset the indoor expansion valve and shut down the indoor unit, preventing refrigerant from continuously flowing through it and wasting energy. A power conversion module connects to an AC power source to convert AC to DC, and the DC circuit is connected to the output of the power conversion module. This not only ensures a continuous and stable DC power supply but also simplifies the overall structure and facilitates circuit layout. Compared to related technologies that require an additional backup power source for DC power, using a power conversion module to convert AC to DC not only guarantees a continuous and stable DC power supply but also eliminates the need for DC charging and storage, and avoids the problem of the main control board failing to operate reliably when the AC circuit is disconnected due to a lack of backup power.

[0016] In some embodiments of this application, the AC circuit is provided with a first detection module, which is used to detect the voltage of the AC circuit to determine whether the AC circuit is conducting.

[0017] In the technical solution, a first detection module is set up to detect the voltage of the AC circuit, and the continuity of the AC circuit is determined based on the voltage of the AC circuit.

[0018] In some embodiments of this application, a second relay is provided on the AC circuit, which is used to control the on / off state of the AC circuit; the second relay is located behind the first detection module on the AC circuit; when the detection information of the first detection module determines that the AC circuit is disconnected, the second relay is disconnected; when the detection information of the first detection module determines that the AC circuit is connected, the second relay is closed.

[0019] In the technical solution, the AC circuit is controlled by a second relay, which is located behind the first detection module. Although the AC circuit behind the first detection module is also disconnected regardless of whether the second relay is closed, if the AC circuit in front of the first detection module is suddenly connected, the AC circuit behind the first detection module will also suddenly connect when the second relay is closed. AC and DC power may flow to the main control board at the same time, which may damage the main control board.

[0020] In some embodiments of this application, a controller is also included, which is connected to the first detection module and the first relay; the controller controls the on / off state of the first relay according to the detection information of the first detection module.

[0021] In the technical solution, a controller is set up so that the controller can determine the on / off state of the AC circuit based on the detection information of the first detection module, thereby controlling the on / off state of the first relay to realize the automatic on / off state of the first relay, and then realize the automatic reset of the indoor expansion valve when the AC circuit is disconnected.

[0022] In some embodiments of this application, a second detection module is provided on the DC circuit, the second detection module being used to detect the voltage of the DC circuit; the second detection module is located in front of the first relay on the DC circuit.

[0023] In the technical solution, a second detection module is set up to detect the voltage of the DC circuit to detect whether the DC circuit is conducting. If both the DC circuit and the AC circuit are disconnected, no current flows into the main control board, and the indoor expansion valve cannot be reset.

[0024] In some embodiments of this application, a third relay is connected in series in the AC circuit, the third relay being used to control the on / off state of the AC circuit; when the third relay is closed, the AC circuit is on; when the third relay is open, the AC circuit is off.

[0025] In the technical solution, the on / off state of the AC circuit is controlled by setting a third relay, so as to control the on / off state of the AC circuit by controlling whether the third relay is closed.

[0026] In some embodiments of this application, a card inserter is connected in series in the AC circuit, and the card inserter is used to control whether the third relay is closed. When a corresponding card is inserted into the card inserter, the third relay is closed; when a corresponding card is removed from the card inserter, the third relay is open.

[0027] In the technical solution, a card reader is connected in series with the AC circuit. By inserting and removing the card reader, the on / off state of the AC circuit can be controlled, so that the multi-split air conditioning system can be applied to places such as hotels and apartments.

[0028] In some embodiments of this application, the main control board is provided with a DC port and an AC port, the DC port being connected to a DC circuit; and the AC port being connected to an AC circuit.

[0029] The technical solution clarifies the connection method between the main control board and the AC / DC circuits. By independently setting DC and AC ports, a stable connection between the AC / DC circuits and the main control board is achieved, which ensures that the main control board accurately receives and processes signals and power from the AC / DC circuits.

[0030] In some embodiments of this application, multiple indoor units are configured, and the multiple indoor units are set independently to each other and connected in parallel to the same outdoor unit; each indoor unit is connected to its own corresponding AC circuit and DC circuit; the AC circuit and DC circuit corresponding to different indoor units work independently to each other.

[0031] In this technical solution, multiple indoor units are connected independently in parallel to the outdoor unit, and each unit operates independently via its own circuit. This allows each indoor unit to be independently controlled to turn on or off according to actual needs, without interfering with each other. This not only improves the flexibility of equipment use and meets the diverse usage needs of different spaces, but also ensures that if one indoor unit malfunctions, it does not affect the normal operation of other indoor units, thus enhancing the stability and reliability of the entire system.

[0032] In addition, this application also provides a multi-split air conditioning system, including:

[0033] Outdoor unit;

[0034] Indoor unit, the indoor unit includes:

[0035] Indoor heat exchanger, used for exchanging heat with indoor air;

[0036] Indoor expansion valve, used to throttle the refrigerant flowing into or out of the indoor heat exchanger;

[0037] The main control board is used to control the opening degree of the indoor expansion valve;

[0038] The AC circuit is connected to the AC power supply and the main control board, and is used to supply AC power to the main control board.

[0039] The first circuit is connected to the AC power supply and the main control board. The first circuit and the AC circuit are arranged in parallel. The first circuit is equipped with a power conversion module, which is used to convert AC power into DC power so that the first circuit can supply DC power to the main control board.

[0040] The AC circuit and the first circuit operate mutually exclusively, with the AC circuit taking priority. When the first circuit supplies power to the main control board, the expansion valve inside the control room of the main control board is reset.

[0041] In the technical solution, the AC circuit and the first circuit are connected in parallel and operate mutually exclusively, with the AC circuit taking priority. This power supply mode ensures that the main control board can stably obtain AC power under normal power supply conditions, maintain the normal control operation of the indoor expansion valve, and ensure efficient heat exchange of the air conditioning system. When switching to the first circuit power supply, the main control board controls the indoor expansion valve to reset, causing the indoor unit to shut down, which improves the reliability, flexibility, and energy efficiency of the system operation.

[0042] In the above embodiments, the multi-split air conditioning system allows both AC and DC circuits to power the main control board, and a first relay controls the on / off state of the DC circuit. This enables alternating power supply from the AC and DC circuits. When the AC circuit is normally conducting, the main control board receives stable AC power, ensuring precise control of the indoor expansion valve opening and guaranteeing efficient and stable operation of the air conditioning system. When the AC circuit is disconnected, the first relay closes to power the DC circuit, and the main control board controls the indoor expansion valve to reset, shutting down the indoor unit. This prevents the indoor expansion valve from remaining open after an AC power interruption, thus avoiding refrigerant flowing through the indoor heat exchanger of the current indoor unit, which would otherwise waste resources and reduce the performance of the multi-split air conditioning system. By setting up a power conversion module and connecting the DC circuit to its output, the AC power is converted to DC power, ensuring the continuity, stability, and reliability of the DC power source in the DC circuit, and simplifying the overall structure. Attached Figure Description

[0043] Figure 1 A schematic diagram of a multi-split air conditioning system in the related art is shown;

[0044] Figure 2 A system diagram of the indoor unit in a multi-split air conditioning system in the related art is shown;

[0045] Figure 3 The system diagram of the outdoor unit in a multi-split air conditioning system in the related art is shown;

[0046] Figure 4 This diagram illustrates the refrigerant flow direction during cooling in a multi-split air conditioning system in the relevant technology.

[0047] Figure 5 This diagram illustrates the refrigerant flow direction during heating in a multi-split air conditioning system in the relevant technology.

[0048] Figure 6 An exemplary schematic diagram of the structure of the individual control module of a multi-split air conditioning system according to some embodiments is shown;

[0049] Figure 7 An exemplary schematic diagram of the individual control module of a multi-split air conditioning system in cooperation with an indoor unit, according to some embodiments, is shown;

[0050] Figure 8 An exemplary diagram is shown of an AC circuit supplying power to the main control board in a multi-split air conditioning system according to some embodiments;

[0051] Figure 9 An exemplary diagram is shown of a DC circuit supplying power to the main control board in a multi-split air conditioning system according to some embodiments;

[0052] Figure 10A schematic diagram of a multi-split air conditioning system according to some embodiments is shown as an example;

[0053] Figure 11 An exemplary flowchart of the indoor expansion valve reset process in a multi-split air conditioning system according to some embodiments is shown.

[0054] In the diagram, 100 is the outdoor unit; 200 is the indoor unit; 300 is the individual unit control module; 400 is the AC circuit; 500 is the first branch circuit; 600 is the power conversion module; 700 is the DC circuit; and 800 is the card reader.

[0055] 101. First pipeline; 102. Second pipeline; 103. Third pipeline; 104. Fourth pipeline; 105. Fifth pipeline;

[0056] 110. Gas-liquid separator; 120. Compressor; 130. Outdoor expansion valve; 140. Outdoor heat exchanger; 150. Outdoor fan; 160. Four-way valve;

[0057] 201, First branch; 202, Second branch;

[0058] 210. Main control board; 220. Indoor heat exchanger; 230. Indoor fan; 240. Indoor expansion valve;

[0059] 211. AC port; 212. DC port;

[0060] 310, First relay; 320, Second relay; 330, Controller; 340, First detection module; 350, Second detection module;

[0061] 410. Third relay. Detailed Implementation

[0062] To make the objectives and implementation methods 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 exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0063] 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.

[0064] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms are interchangeable where appropriate.

[0065] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0066] The multi-split air conditioning system provided in this application can have various implementation forms. Figures 1-5 This is a specific implementation of the multi-split air conditioning system of this application.

[0067] like Figure 1 and Figure 2 As shown, the multi-split air conditioning system includes an outdoor unit 100, which is located outdoors and is used for heat exchange with outdoor air.

[0068] like Figure 1 and Figure 2 As shown, the outdoor unit 100 includes an outdoor heat exchanger 140, which is used to exchange heat with the outdoor air; a refrigerant for exchanging heat with the air flows inside the outdoor heat exchanger 140; when the indoor unit 200 is cooling, the outdoor heat exchanger 140 works as a condenser; when the indoor unit 200 is heating, the outdoor heat exchanger 140 works as an evaporator.

[0069] like Figure 1 and Figure 2 As shown, the outdoor unit 100 includes an outdoor fan 150, which is located near the outdoor heat exchanger 140 to increase airflow and accelerate the heat exchange efficiency between the air and the outdoor heat exchanger 140.

[0070] like Figure 1 and Figure 2 As shown, the outdoor unit 100 includes a compressor 120, which is used to compress refrigerant gas in a low temperature and low pressure state into refrigerant gas in a high temperature and high pressure state. The compressor 120 provides power for the circulation of refrigerant in the pipeline.

[0071] like Figure 1 and Figure 2 As shown, the outdoor unit 100 includes a four-way valve 160, which is used to switch the flow direction of the refrigerant. One port of the four-way valve 160 is connected to the outlet of the compressor 120 through the first pipe 101, one port of the four-way valve 160 is connected to the inlet of the compressor 120 through the second pipe 102, one port of the four-way valve 160 is connected to the outdoor heat exchanger 140 through the third pipe 103, and one port of the four-way valve 160 is connected to the indoor unit 200 through the fourth pipe 104.

[0072] In some embodiments, the outdoor unit 100 includes a gas-liquid separator 110 for separating the refrigerant into gas and liquid phases; the gas-liquid separator 110 is disposed within the second pipeline 102. The gas-liquid separator 110 separates the refrigerant returning from the evaporator to the compressor 120 into gas and liquid, allowing only the gas phase to return to the compressor 120, thereby preventing liquid refrigerant from entering the compressor 120 and preventing liquid slugging in the compressor 120.

[0073] like Figure 3 As shown, the multi-split air conditioning system includes an indoor unit 200, which is located indoors and used for heat exchange with indoor air. The indoor unit 200 and the outdoor unit 100 cooperate with each other to realize the circulation of refrigerant between the outdoor unit 100 and the indoor unit 200, thereby enabling the indoor unit 200 to cool or heat the indoor environment.

[0074] like Figure 3 As shown, the indoor unit 200 includes an indoor heat exchanger 220, which is used for heat exchange with indoor air. A refrigerant for heat exchange with the air flows inside the indoor heat exchanger 220. When the indoor unit 200 is cooling, the indoor heat exchanger 220 operates as an evaporator; when the indoor unit 200 is heating, the indoor heat exchanger 220 operates as a condenser.

[0075] The indoor heat exchanger 220 is connected to the four-way valve 160 via the fourth pipe 104. The indoor heat exchanger 220 is also connected to the fifth pipe 105, which is connected to the outdoor heat exchanger 140. When the outdoor heat exchanger 140 is an evaporator, the refrigerant flows from the indoor heat exchanger 220 to the outdoor heat exchanger 140 via the fifth pipe 105. When the outdoor heat exchanger 140 is a condenser, the refrigerant flows from the outdoor heat exchanger 140 to the indoor heat exchanger 220 via the fifth pipe 105.

[0076] like Figure 2 As shown, an outdoor expansion valve 130 is provided on the fifth pipeline 105 to throttle the refrigerant flowing into or out of the outdoor heat exchanger 140.

[0077] like Figure 3 As shown, the indoor unit 200 includes an indoor fan 230, which is located near the indoor heat exchanger 220 to increase airflow and accelerate the heat exchange efficiency between the air and the indoor heat exchanger 220.

[0078] like Figure 4 As shown, when the indoor unit 200 is in cooling mode, the refrigerant compressed by the compressor 120 flows into the outdoor heat exchanger 140 to exchange heat with the outdoor air, then flows into the indoor unit 200 to exchange heat with the indoor air, and then flows back to the compressor 120. The refrigerant circulates between the compressor 120, the outdoor heat exchanger 140, the indoor heat exchanger 220, and the compressor 120.

[0079] like Figure 5 As shown, when the indoor unit 200 is in heating mode, the refrigerant compressed by the compressor 120 flows into the indoor unit 200, exchanges heat with the indoor air, then flows into the outdoor heat exchanger 140 to exchange heat with the outdoor air, and then flows back to the compressor 120. The refrigerant circulates between the compressor 120, the indoor heat exchanger 220, the outdoor heat exchanger 140, and the compressor 120.

[0080] In a multi-split air conditioning system, multiple indoor units 200 are configured, each operating independently, and connected in parallel to the same outdoor unit 100. These indoor units 200 are located in different rooms, allowing the system to cool or heat multiple rooms. The outdoor unit 100 is typically single, operating in conjunction with the multiple indoor units 200. Refrigerant is distributed among the indoor units 200, enabling each unit to cool or heat a different room.

[0081] When multiple indoor units 200 are set, multiple indoor heat exchangers 220 are set, and the multiple indoor heat exchangers 220 are connected in parallel to the fourth pipe 104 and the fifth pipe 105 respectively.

[0082] like Figure 3 As shown, one interface of the indoor heat exchanger 220 is connected to the fourth pipe 104 through the first branch 201, and the other interface of the indoor heat exchanger 220 is connected to the fifth pipe 105 through the second branch 202; multiple indoor heat exchangers 220 are respectively connected to the fourth pipe 104 through their respective first branch 201, and multiple indoor heat exchangers 220 are respectively connected to the fifth pipe 105 through their respective second branch 202.

[0083] The refrigerant in the fourth pipe 104 or the fifth pipe 105 is diverted to multiple first branches 201 or multiple second branches 202, or the refrigerant in multiple first branches 201 or multiple second branches 202 is collected into the fourth pipe 104 or the fifth pipe 105. Different indoor units 200 require different refrigerant flow rates. Therefore, each indoor unit 200 includes an indoor expansion valve 240, which is located on the second branch 202 and is used to throttle the refrigerant flowing into or out of the indoor heat exchanger 220.

[0084] like Figure 3 As shown, the indoor unit 200 includes a main control board 210, which controls the opening of the indoor expansion valve 240, thereby controlling the flow rate of refrigerant through the indoor heat exchanger 220, so that the indoor heat exchanger 220 can exchange heat with the indoor air, thereby enabling the indoor unit 200 to cool or heat the room.

[0085] It should be noted that in this application, the main control board 210 can operate by either AC power or DC power, which is prior art in this field and will not be described in detail here.

[0086] In related technologies, some multi-split air conditioning systems have indoor units 200 installed in different rooms, with each room independently controlled for power on / off. For example, if room A experiences a sudden power outage while its indoor unit 200 is running, other rooms will continue to receive power. Even when the indoor units 200 in other rooms are operating normally, the indoor expansion valve 240 of the indoor unit 200 in room A remains open due to the power outage, allowing refrigerant to continue flowing through it. If the power outage in room A is due to a user leaving, this continued refrigerant flow to the indoor unit 200 wastes resources and reduces the performance of the multi-split air conditioning system. If the power outage in room A is due to a malfunction, the refrigerant will still flow through the indoor heat exchanger 220, potentially leading to adverse consequences.

[0087] Based on this, this application sets up AC circuit 400 and DC circuit 700 to simultaneously power the main control board 210, and sets up a sub-unit control module 300 to control the on / off state of AC circuit 400 and DC circuit 700. When AC circuit 400 is on, DC circuit 700 is disconnected, so that AC circuit 400 provides power to indoor unit 200, enabling indoor unit 200 to operate normally; when AC circuit 400 is off, DC circuit 700 is on, so that DC circuit 700 provides power to indoor unit 200, causing main control board 210 to control indoor expansion valve 240 to reset, thereby shutting down indoor unit 200.

[0088] Specifically, such as Figure 7 As shown, the multi-split air conditioning system includes an AC circuit 400, which is connected to an AC power source and a main control board 210 to supply AC power to the main control board 210. It should be noted that the voltage of the AC circuit 400 is typically 220V.

[0089] like Figure 7 As shown, the multi-split air conditioning system includes a DC circuit 700, which is connected to the main control board 210 and is used to supply DC power to the main control board 210. The DC circuit 700 and the AC circuit 400 are mutually exclusive in terms of power supply, and the AC circuit 400 has priority over the DC circuit 700 in power supply.

[0090] The individual household control module 300 includes a first relay 310, which is located on the DC circuit 700 and is used to control the on / off state of the DC circuit 700.

[0091] When the AC circuit 400 is on, the first relay 310 is off, so that the DC circuit 700 cannot supply power to the main control board 210; when the AC circuit 400 is off, the first relay 310 is off, so that the DC circuit 700 supplies power to the main control board 210, thereby causing the main control board 210 to control the indoor expansion valve 240 to reset.

[0092] like Figures 6-9 As shown, the individual household control module 300 includes a first detection module 340, which is located on the AC circuit 400 and is used to detect the voltage of the AC circuit 400. Based on the voltage detected by the first detection module 340, it can be determined whether the AC circuit 400 is conducting.

[0093] like Figures 6-9 As shown, the individual household control module 300 includes a second relay 320, which is located on the AC circuit 400 and is used to control the on / off state of the AC circuit 400; the second relay 320 is located behind the first detection module 340 on the AC circuit 400.

[0094] When the detection information from the first detection module 340 indicates that the AC circuit 400 is disconnected, the second relay 320 disconnects; when the detection information from the first detection module 340 indicates that the AC circuit 400 is connected, the second relay 320 closes.

[0095] Although the AC circuit 400 in front of the first detection module 340 is disconnected when the second relay 320 is closed, the AC circuit 400 behind the first detection module 340 is also disconnected. However, if the AC circuit 400 in front of the first detection module 340 suddenly becomes conductive, the AC circuit 400 behind the first detection module 340 will also suddenly become conductive when the second relay 320 is closed. This could cause both AC and DC power to flow simultaneously to the main control board 210, potentially damaging it. Therefore, the second relay 320 is installed on the AC circuit 400. When the AC circuit 400 is disconnected, the second relay 320 is deactivated to protect the main control board 210 from simultaneous AC and DC power flow and damage. When the AC circuit 400 is closed, the second relay 320 is activated to allow the AC circuit 400 to conduct and supply power to the main control board 210.

[0096] like Figures 6-9 As shown, the individual household control module 300 includes a controller 330, which is connected to the first detection module 340 and the first relay 310. The controller 330 controls the on / off state of the first relay 310 according to the detection information of the first detection module 340, so as to realize the automatic on / off state of the first relay 310.

[0097] The controller 330 is connected to the second relay 320. The controller 330 controls the on / off state of the second relay 320 according to the detection information of the first detection module 340, so as to realize the automatic on / off state of the second relay 320.

[0098] In some embodiments, the controller 330 determines the on / off state of the AC circuit 400 based on the detection information from the first detection module 340, thereby controlling the on / off state of the first relay 310 and the second relay 320.

[0099] It should be noted that the controller 330 controlling the on / off state of the relay based on the detection information is a conventional technical means in this field, and will not be elaborated here.

[0100] like Figures 6-9 As shown, the individual household control module 300 includes a second detection module 350, which is located on the DC circuit 700 and is used to detect the voltage of the DC circuit 700. The second detection module 350 is located in front of the first relay 310 on the DC circuit 700 to detect whether the part of the DC circuit 700 in front of the first relay 310 is conductive.

[0101] It should be noted that if both the DC circuit 700 and the AC circuit 400 are disconnected, no current will flow into the main control board 210, and the indoor expansion valve 240 will not be able to reset.

[0102] The second detection module 350 is connected to the controller 330, and the second detection module 350 transmits the detected DC voltage information to the controller 330.

[0103] In some embodiments, when the second detection module 350 detects that the DC circuit 700 is disconnected, the controller 330 controls the alarm device connected to the controller 330 to sound an alarm to prompt the user that the indoor expansion valve 240 cannot be automatically reset.

[0104] In some embodiments, such as Figure 7 As shown, a card reader 800 is connected in series with the AC circuit 400. The card reader 800 is used to control the on / off state of the AC circuit 400. By inserting and removing the card reader 800, the on / off state of the AC circuit 400 can be controlled, so that the multi-split air conditioning system can be applied to places such as hotels and apartments.

[0105] like Figures 7-9 As shown, the AC circuit 400 is equipped with a third relay 410, which is used to turn the AC circuit 400 on or off. The user can control whether the AC circuit 400 is on or off by controlling the third relay 410. When a corresponding card is inserted into the card reader 800, the third relay 410 closes, turning the AC circuit 400 on; when a card is removed from the card reader 800, the third relay 410 opens, turning off the AC circuit 400.

[0106] like Figure 8 As shown, when the third relay 410 is closed, the second relay 320 is closed and the first relay 310 is open, which turns on the AC circuit 400 and turns off the DC circuit 700, so that the AC circuit 400 supplies power to the main control board 210, so that the indoor unit 200 can operate normally.

[0107] like Figure 9 As shown, when the third relay 410 is disconnected, the second relay 320 is disconnected and the first relay 310 is closed, so that the DC circuit 700 supplies power to the main control board 210, and the main control board 210 controls the indoor expansion valve 240 to reset, so as to shut down the indoor unit 200.

[0108] like Figures 7-9 As shown, the multi-split air conditioning system includes a power conversion module 600. The output terminal of the power conversion module 600 is connected to the input terminal of the DC circuit 700, and the input terminal of the power conversion module 600 is connected to an AC power source to convert AC power into DC power.

[0109] By connecting the power conversion module 600 to an AC power source, the AC power is converted into DC power, so that the DC circuit 700 can provide DC power to the main control board 210. This eliminates the need for an additional DC power supply or backup power supply, thus avoiding issues such as charging and storing DC power and simplifying the overall structure.

[0110] In some embodiments, the power conversion module 600 is used to convert 220V AC power into 12V DC power.

[0111] In some embodiments, such as Figures 7-9 As shown, the input terminal of the power conversion module 600 is connected to the first branch 500, and the other end of the first branch 500 is connected to the AC power supply. The current in the first branch 500 is AC.

[0112] The first branch 500 and the DC circuit 700 together form the first circuit. The first circuit and the AC circuit 400 are connected in parallel and selectively conduct and work mutually exclusively, so that the AC and DC power can only supply power to the main control board 210 in one pair, ensuring the reliability and safety of the main control board 210 when it is powered on.

[0113] like Figure 3 As shown, the main control board 210 is provided with a DC port 212, which is connected to the output terminal of the DC circuit 700.

[0114] The main control board 210 is equipped with an AC port 211, which is connected to the output terminal of the AC circuit 400. By independently setting the DC port 212 and the AC port 211, a stable connection between the AC / DC circuit 700 and the main control board 210 is achieved, ensuring that the main control board 210 accurately receives and processes signals and power from the AC / DC circuit 700.

[0115] In some embodiments of this application, a preset program can be included in the main control board 210 so that when DC power is applied to the main control board 210, the main control board 210 controls the indoor expansion valve 240 to reset; alternatively, the controller 330 can be connected to the main control board 210, and when the controller 330 determines that the AC circuit 400 is disconnected based on the detection information from the first detection module 340, the controller 330 controls the main control board 210 to reset the indoor expansion valve 240.

[0116] It should be noted that the control logic for resetting the expansion valve 240 in the control room of the main control board 210 is a conventional technical means in this field, and will not be elaborated here.

[0117] The control logic used by the controller 330 in this application is a conventional technique or existing technology in the field, and will not be described in detail here.

[0118] In a multi-split air conditioning system, each indoor unit 200 is connected to its own corresponding AC circuit 400 and DC circuit 700; the AC circuit 400 and DC circuit 700 corresponding to different indoor units 200 work independently.

[0119] By connecting multiple indoor units 200 independently in parallel to the outdoor unit 100, with each unit operating independently, each indoor unit 200 can be independently controlled to turn on or off according to actual needs, without interfering with each other. This not only improves the flexibility of equipment use and meets the diverse usage needs of different spaces, but also ensures that if one indoor unit 200 fails, it does not affect the normal operation of other indoor units 200, thus improving the stability and reliability of the entire system.

[0120] The aforementioned multi-split air conditioning system allows both AC circuit 400 and DC circuit 700 to power the main control board 210, and sets up a first relay 310 to control the on / off state of the DC circuit 700. This enables alternating power supply between AC circuit 400 and DC circuit 700. When AC circuit 400 is normally conducting, the main control board 210 obtains stable AC power, ensuring precise control of the opening of the indoor expansion valve 240 and ensuring efficient and stable operation of the air conditioning system. When AC circuit 400 is disconnected, the first relay 310 closes to power the DC circuit 700, and the main control board 210 controls the indoor expansion valve 240 to reset, causing the indoor unit 200 to shut down. This prevents the indoor expansion valve 240 from remaining open after AC power interruption, allowing refrigerant to continue flowing through the indoor heat exchanger 220 of the current indoor unit 200, thus avoiding resource waste and reduced performance of the multi-split air conditioning system.

[0121] The following section uses the application of a multi-split air conditioning system in a hotel as an example to explain in detail the working principle of the aforementioned multi-split air conditioning system, including the reset principle of the indoor expansion valve 240 after a sudden interruption of AC power.

[0122] like Figure 10 As shown, rooms A, B, ..., N are each equipped with an indoor unit 200, and the indoor units 200 in rooms A, B, ..., N are connected in parallel to the same outdoor unit 100. Rooms A, B, and C are each equipped with their own corresponding AC circuit 400 and their own corresponding individual control module 300, and each room controls the on / off state of its respective AC circuit 400 through its corresponding room card. The AC circuit 400 provides 220V AC mains power to the main control board 210, and the DC circuit 700 provides 12V DC power to the main control board 210.

[0123] like Figure 11 As shown, when the room card is inserted, the third relay 410 closes, and AC 220V mains power is supplied to the individual control module 300. The first detection module 340 detects the AC 220V mains power input and controls the second relay 320 to close, while the first relay 310 opens, allowing AC 220V mains power to supply power to the indoor unit 200 of the air conditioner. When the indoor unit 200 is running, the main control board 210 controls the indoor expansion valve 240 to open at a certain angle, allowing refrigerant to flow through the indoor heat exchanger 220 to cool or heat the room. When the indoor unit 200 is running, a sudden... When the room card is removed, the third relay 410 disconnects, disconnecting the AC220V mains power from the indoor unit. The first detection module 340 detects the disconnection of the AC220V mains power, and the controller 330 controls the second relay 320 to disconnect. After waiting for 10 seconds, the indoor unit 200 of the air conditioner is powered off and completely stops. After 10 seconds, the first relay 310 is closed, and the main control board 210 is powered by DC12V. When the main control board 210 is powered on again, it will reset the indoor expansion valve 240, completely closing the indoor expansion valve 240, so that the refrigerant cannot flow into the indoor heat exchanger 220.

[0124] For example, if a user suddenly removes their card and leaves room A, the power in room A will be cut off immediately. At this time, the AC circuit 400 in room A will be disconnected. The controller 330 in room A will control the first relay 310 to close and the second relay 320 to open based on the voltage information of the AC circuit 400 detected by the first detection module 340, so that the DC circuit 700 will be turned on and supply power to the main control board 210. The main control board 210 will control the indoor expansion valve 240 in room A to reset, so that the indoor unit 200 in room A will be turned off.

[0125] When the user returns with the card, the AC circuit 400 between the second relays 320 is turned on. The controller 330 in room A controls the second relay 320 to close and the first relay 310 to open based on the voltage information of the AC circuit 400 detected by the first detection module 340, so as to restore the AC circuit 400 to supply power to the main control board 210. The user can restart the indoor unit 200 to make the indoor unit 200 run normally.

[0126] It should be noted that the first circuit in each of rooms A, B, and C is not controlled by the room card. If the first relay 310 is not disconnected, the first circuit will always be on.

[0127] In some embodiments of this application, the description of the individual household control module 300 is as follows:

[0128] The 300 individual household control module supports selective access to 220VAC and 12VDC power supplies and features automatic switching. When 220V power is available, the device will prioritize using 220V. If the 220V power supply fails, the device will automatically switch to 12V system power after 10 seconds, awaiting the restoration of 220V power. The following are the operating steps:

[0129] I. Equipment Connection

[0130] 1. Confirm that the device is powered off.

[0131] 2. Referring to the wiring diagram, connect the 220V AC power cord to the 220V input port of the device.

[0132] 3. Connect the 12V DC power cord to the 12V input port of the device, paying attention to the positive and negative terminals.

[0133] 4. After ensuring all connections are correct, turn on the AC 220V and DC 12V power supplies.

[0134] II. Normal Working Mode

[0135] 1. After the equipment is powered on, first check if there is power from the 220V power supply.

[0136] 2. If there is 220V power, LED 1 will light up, and the device will automatically select 220V power supply. At the same time, LED 3 will light up.

[0137] 3. During 220V power supply, the device will continuously monitor the 220V power supply status.

[0138] 4. If the 12V power supply is available, LED #2 will light up.

[0139] III. Handling 220V Power Outages and Restoration

[0140] 1. If a 220V power outage is detected, the device will disconnect the 220V output relay, LEDs 1 and 3 will turn off, and a 10-second timer will start simultaneously.

[0141] 2. During the 10-second delay, the device will not immediately switch to 12V power. LED 4 will flash, indicating that it is ready to connect to 12V power.

[0142] 3. After a 10-second delay, the device will automatically switch to 12V system power supply, and LED 4 will remain constantly lit.

[0143] 4. If the 220V power supply is detected to be restored, the device will cut off the 12V output relay, LED 1 will light up, LED 4 will turn off, and a 10-second timer will start simultaneously.

[0144] 5. During the 10-second delay, the device will not immediately switch to 220V power. LED 3 will flash, indicating that it is ready to connect to 220V power.

[0145] 6. After a 10-second delay, the device will automatically switch to 220V system power supply, and LED 3 will remain lit.

[0146] IV. Handling 12V power supply disconnection

[0147] 1. If a 220V power supply is detected, but there is no 12V input, LED 2 will turn off, and the device will continue to output 220V.

[0148] The multi-split air conditioning system adopts a power supply mode that prioritizes AC and DC power, ensuring that the main control board 210 can stably obtain AC power under normal AC power supply conditions, maintaining the normal control operation of the indoor expansion valve 240 and ensuring efficient heat exchange of the air conditioning system. In the event of a sudden AC power interruption, DC power can be used to temporarily power the main control board 210, allowing the main control board 210 to control the indoor expansion valve 240 to reset, thereby shutting down the indoor unit 200. This avoids the indoor expansion valve 240 remaining open after an AC power interruption, which would cause refrigerant to continue flowing through the current indoor heat exchanger 220, resulting in resource waste and reduced performance of the multi-split air conditioning system.

[0149] 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.

[0150] 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 described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A multi-split air conditioning system, characterized in that, include: Outdoor unit; Indoor unit, the indoor unit includes: Indoor heat exchanger, used for exchanging heat with indoor air; An indoor expansion valve is used to throttle the refrigerant flowing into or out of the indoor heat exchanger. The main control board is used to control the opening degree of the indoor expansion valve; An AC circuit, which is connected to an AC power source and the main control board, is used to supply AC power to the main control board; A power conversion module is used to convert AC power into DC power; the input terminal of the power conversion module is connected to an AC power source, and the output terminal of the power conversion module is connected to a DC circuit, which is connected to the main control board to supply DC power to the main control board. A first relay, connected in series in the DC circuit, is used to control the on / off state of the DC circuit; When the AC circuit is on, the first relay is off; when the AC circuit is off, the first relay is closed.

2. The multi-split air conditioning system according to claim 1, characterized in that, The AC circuit is equipped with a first detection module, which is used to detect the voltage of the AC circuit to determine whether the AC circuit is conducting.

3. The multi-split air conditioning system according to claim 2, wherein, The AC circuit is equipped with a second relay, which is used to control the on / off state of the AC circuit. The second relay is located behind the first detection module on the AC circuit. When the AC circuit is disconnected, the second relay is disconnected; when the AC circuit is connected, the second relay is closed.

4. The multi-split air conditioning system according to claim 2, wherein, It also includes a controller, which is connected to the first detection module and the first relay; the controller controls the on / off state of the first relay according to the detection information of the first detection module.

5. The multi-split air conditioning system according to claim 1, wherein, The DC circuit is equipped with a second detection module, which is used to detect the voltage of the DC circuit; the second detection module is located in front of the first relay on the DC circuit. 6.The multi-split air conditioning system according to claim 1, characterized in that, A third relay is connected in series in the AC circuit. The third relay is used to control the on / off state of the AC circuit. When the third relay is closed, the AC circuit is on. When the third relay is open, the AC circuit is off.

7. The multi-split air conditioning system according to claim 6, wherein, A card inserter is connected in series in the AC circuit. The card inserter is used to control whether the third relay is closed. When a corresponding card is inserted into the card inserter, the third relay is closed. When a corresponding card is removed from the card inserter, the third relay is open. 8.The multi-split air conditioning system according to claim 1, characterized in that, The main control board is provided with a DC port and an AC port. The DC port is connected to the DC circuit, and the AC port is connected to the AC circuit. 9.The multi-split air conditioning system according to claim 1, wherein, The indoor units are configured as multiple units, which are set independently to each other and connected in parallel to the same outdoor unit; each indoor unit is connected to its own corresponding AC circuit and DC circuit; the AC circuit and DC circuit corresponding to different indoor units operate independently to each other.

10. A multi-split air conditioning system, characterized in that, include: Outdoor unit; Indoor unit, the indoor unit includes: Indoor heat exchanger, used for exchanging heat with indoor air; An indoor expansion valve is used to throttle the refrigerant flowing into or out of the indoor heat exchanger. The main control board is used to control the opening degree of the indoor expansion valve; An AC circuit, which is connected to an AC power source and the main control board, is used to supply AC power to the main control board; A first circuit is connected to an AC power supply and the main control board. The first circuit and the AC circuit are arranged in parallel. The first circuit is equipped with a power conversion module, which is used to convert AC power into DC power so that the first circuit can supply DC power to the main control board. The AC circuit operates mutually exclusively with the first circuit, and the AC circuit operates first; when the first circuit supplies power to the main control board, the main control board controls the indoor expansion valve to reset.

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