Multi-connected air conditioning system control method and device and multi-connected air conditioning system

Abstract

The application discloses a multi-connected air conditioner system control method and device and a multi-connected air conditioner system, and relates to the technical field of air conditioner systems. The method comprises the following steps: detecting whether there is a shutdown unit in the multi-connected air conditioner system; when there is a shutdown unit, judging whether there is a refrigerant deflection unit in the multi-connected air conditioner system; when there is a refrigerant deflection unit, adjusting the refrigerant flow of the refrigerant deflection unit by controlling the operation of the refrigerant deflection unit and the refrigerant pipeline of the shutdown unit. The application solves the problem of refrigerant deflection in the prior art multi-connected air conditioner system, quickly and effectively adjusts the refrigerant of the refrigerant deflection unit, efficiently utilizes the shutdown unit, and guarantees the stability of system operation.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to a control method, device, and multi-split air conditioning system. Background Technology

[0002] In engineering practice, multi-split air conditioning systems are often used to control indoor temperature and humidity in buildings. A multi-split air conditioning system consists of multiple air conditioning units, each including indoor and outdoor units. When applied to larger buildings, different functional zones are typically controlled for temperature and humidity. Since the operating times of these zones differ, some units may be shut down during operation. Furthermore, the capacity requirements of each functional zone vary, leading to discrepancies in refrigerant circulation between systems. This refrigerant imbalance can result in some units having insufficient refrigerant circulation while others have excessive circulation. Insufficient refrigerant circulation leads to higher compressor discharge temperatures, causing sustained high temperatures inside the compressor and reducing the lubricating oil's effectiveness, ultimately resulting in severe wear and seizure of cylinder components and system shutdown. Excessive refrigerant circulation results in lower compressor discharge temperatures, causing refrigerant slugging and reducing system capacity and efficiency. Additionally, the refrigerant stored in shut-down units cannot be utilized in a timely manner, leading to idle resources and increased operating costs.

[0003] There is currently no effective solution to the problem of refrigerant misflow in multi-split air conditioning systems in related technologies. Summary of the Invention

[0004] This invention provides a control method, device, and multi-split air conditioning system for multi-split air conditioning systems, so as to at least solve the problem of refrigerant misflow in existing multi-split air conditioning systems.

[0005] To address the aforementioned technical problems, according to one aspect of the present invention, a method for controlling a multi-split air conditioning system is provided, comprising:

[0006] Check if any units in the multi-split air conditioning system are shut down;

[0007] When there are out-of-service units, determine whether there are refrigerant misflow units in the multi-split air conditioning system;

[0008] When a refrigerant-biased flow unit is in existence, the refrigerant flow rate of the refrigerant-biased flow unit is adjusted by controlling the refrigerant pipeline of the unit during operation and shutdown.

[0009] Furthermore, determining whether a multi-split air conditioning system has a refrigerant misflow unit includes:

[0010] Detect the compressor operating parameters of each unit in a multi-split air conditioning system;

[0011] Determine the refrigerant quantity status of each unit based on the compressor operating parameters of each unit;

[0012] Determine whether there are refrigerant misflow units in the multi-split air conditioning system based on the refrigerant quantity status of each unit.

[0013] Furthermore, the compressor operating parameters include at least: high pressure and discharge temperature; the refrigerant quantity status includes at least one of the following: insufficient refrigerant, normal refrigerant, and excessive refrigerant; the refrigerant quantity status of each unit is determined based on the compressor operating parameters of each unit, including:

[0014] When the high pressure is lower than the first preset pressure value and the exhaust temperature is higher than the first preset temperature value, the refrigerant quantity status of the corresponding unit is determined to be insufficient refrigerant quantity;

[0015] When the high pressure is higher than the second preset pressure value and the exhaust temperature is lower than the second preset temperature value, the refrigerant quantity status of the corresponding unit is determined to be excessive refrigerant quantity; wherein, the first preset pressure value is less than the second preset pressure value and the first preset temperature value is greater than the second preset temperature value.

[0016] Furthermore, based on the refrigerant quantity status of each unit, it is determined whether there are any units in the multi-split air conditioning system with refrigerant misflow, including:

[0017] When the refrigerant quantity of at least one unit is too low or too high, it is determined that there is a refrigerant misflow unit in the multi-split air conditioning system.

[0018] Otherwise, it can be determined that there are no refrigerant misflow units in the multi-split air conditioning system.

[0019] Furthermore, the refrigerant quantity status includes at least one of the following: insufficient refrigerant, normal refrigerant quantity, or excessive refrigerant quantity; the refrigerant flow rate of the refrigerant-deflecting unit is adjusted by controlling the refrigerant piping of the operating and shut-down units, including:

[0020] When the refrigerant quantity of the refrigerant-biased flow unit is excessive, the opening degree of the flow regulating valves of the gas pipe and liquid pipe of the outdoor unit of the refrigerant-biased flow unit is reduced; or, while reducing the opening degree of the flow regulating valves of the gas pipe and liquid pipe of the outdoor unit of the refrigerant-biased flow unit, the liquid pipe of the outdoor unit of the shut-down unit is opened and the gas pipe is closed.

[0021] Furthermore, regulating the refrigerant flow rate of the refrigerant-biased chiller unit by controlling the refrigerant piping of the unit during operation and shutdown also includes:

[0022] When the refrigerant quantity in the refrigerant-biased flow unit is too low, the opening of the flow regulating valves for the gas and liquid pipes of the outdoor unit of the refrigerant-biased flow unit is increased.

[0023] Recheck the refrigerant level of the refrigerant-biased unit and determine whether to start or stop the unit based on the test results.

[0024] Furthermore, based on the test results, determine whether to activate the shut-down unit, including:

[0025] When the refrigerant flow status of the refrigerant deflection unit is normal, the shutdown unit should not be started.

[0026] When the refrigerant level in the refrigerant-biased chiller is too low, start the shutdown unit.

[0027] Furthermore, when the shutdown unit is not turned on, it also includes: controlling the liquid pipe of the outdoor unit of the refrigerant deflection unit to be closed and the gas pipe to be opened until the refrigerant quantity status of the refrigerant deflection unit is normal.

[0028] When starting or stopping the unit, the following steps are also taken: opening the liquid pipe and closing the gas pipe of the outdoor unit of the refrigerant deflection unit until the refrigerant quantity status of the refrigerant deflection unit is normal.

[0029] According to another aspect of the present invention, a multi-split air conditioning system control device is provided, comprising:

[0030] The detection module is used to detect whether any units in a multi-split air conditioning system are shut down.

[0031] The judgment module is used to determine whether there is a refrigerant misflow unit in the multi-split air conditioning system when there is a shut-down unit.

[0032] The regulating module is used to adjust the refrigerant flow of the refrigerant-biased unit by controlling the refrigerant piping of the unit when a refrigerant biased unit is present.

[0033] According to another aspect of the present invention, a multi-split air conditioning system is provided, including the multi-split air conditioning system control device as described above.

[0034] According to another aspect of the present invention, a storage medium containing computer-executable instructions is provided, which, when executed by a computer processor, are used to perform the multi-split air conditioning system control method described above.

[0035] This invention provides a control scheme for a multi-split air conditioning system. When a unit in the multi-split air conditioning system is shut down, it determines whether refrigerant misflow exists. If refrigerant misflow exists, the refrigerant flow rate of the refrigerant misflow unit is adjusted by controlling the operation of the refrigerant misflow unit and the refrigerant piping of the shut-down unit. This scheme, when refrigerant misflow occurs in the system, adjusts the refrigerant flow rate of the refrigerant misflow unit by controlling its operation and the refrigerant piping of the shut-down unit. This allows for rapid and effective refrigerant regulation of the system. In addition to the self-regulation of the refrigerant misflow unit, it also ensures efficient utilization of the shut-down unit, regulates the refrigerant misflow situation, guarantees system stability, and improves system operating efficiency. Attached Figure Description

[0036] Figure 1 This is an optional flowchart of a multi-split air conditioning system control method according to an embodiment of the present invention;

[0037] Figure 2 This is another optional flowchart of the control method for a multi-split air conditioning system according to an embodiment of the present invention;

[0038] Figure 3 This is an optional structural block diagram of a multi-split air conditioning system control device according to an embodiment of the present invention. Detailed Implementation

[0039] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0040] Example 1

[0041] In a preferred embodiment of the present invention, a control method for a multi-split air conditioning system is provided. This control method can be directly applied to multi-split air conditioning systems, especially those with multiple units, including multiple indoor and outdoor units. Refrigerant misalignment can lead to some units having insufficient refrigerant circulation while others have excessive refrigerant circulation. Specifically... Figure 1 An optional flowchart of the method is shown, such as Figure 1 As shown, the method includes the following steps S102-S106:

[0042] S102: Check if any units in a multi-split air conditioning system are shut down;

[0043] S104: When there are out-of-service units, determine whether there are refrigerant misflow units in the multi-split air conditioning system;

[0044] S106: When a refrigerant deflection unit is present, the refrigerant flow rate of the refrigerant deflection unit is adjusted by controlling the refrigerant piping of the unit during operation and shutdown.

[0045] The above embodiments provide a control scheme for a multi-split air conditioning system. When a unit in the multi-split air conditioning system is shut down, it is determined whether refrigerant misflow exists. If refrigerant misflow exists, the refrigerant flow rate of the refrigerant misflow unit is adjusted by controlling the operation of the refrigerant misflow unit and the refrigerant piping of the shut-down unit. This scheme, when refrigerant misflow occurs in the system, adjusts the refrigerant flow rate of the refrigerant misflow unit by controlling its operation and the refrigerant piping of the shut-down unit. This allows for rapid and effective refrigerant regulation of the system. In addition to the self-regulation of the refrigerant misflow unit, it also ensures efficient utilization of the shut-down unit, regulates the refrigerant misflow situation, guarantees system stability, and improves system operating efficiency.

[0046] In a preferred embodiment of the present invention, determining whether a refrigerant misflow unit exists in a multi-split air conditioning system includes: detecting the compressor operating parameters of each unit in the multi-split air conditioning system; determining the refrigerant quantity status of each unit based on the compressor operating parameters of each unit; and determining whether a refrigerant misflow unit exists in the multi-split air conditioning system based on the refrigerant quantity status of each unit.

[0047] Optionally, the compressor operating parameters include at least: high-pressure pressure and discharge temperature; the refrigerant quantity status includes at least one of the following: insufficient refrigerant, normal refrigerant, and excessive refrigerant. The refrigerant quantity status of each unit is determined based on its compressor operating parameters, including: when the high-pressure pressure is lower than a first preset pressure value and the discharge temperature is higher than a first preset temperature value, the corresponding unit is determined to have insufficient refrigerant; when the high-pressure pressure is higher than a second preset pressure value and the discharge temperature is lower than a second preset temperature value, the corresponding unit is determined to have excessive refrigerant. The first preset pressure value is less than the second preset pressure value, and the first preset temperature value is greater than the second preset temperature value. Refrigerant misalignment can lead to some units having insufficient refrigerant circulation and others having excessive refrigerant circulation. Insufficient refrigerant circulation results in a higher compressor discharge temperature, while excessive refrigerant circulation results in a lower compressor discharge temperature. Therefore, compressor operating parameters can be used to determine if refrigerant misalignment exists in a unit. Of course, refrigerant misalignment can also manifest in other ways, so other parameters can be used to determine refrigerant misalignment.

[0048] After determining the refrigerant quantity status of each unit, determine whether there is a refrigerant misflow unit in the multi-split air conditioning system based on the refrigerant quantity status of each unit, including: if the refrigerant quantity status of at least one unit is too low or too high, determine that there is a refrigerant misflow unit in the multi-split air conditioning system; otherwise, determine that there is no refrigerant misflow unit in the multi-split air conditioning system.

[0049] After confirming the presence of refrigerant-biased units in the multi-split air conditioning system, the refrigerant flow rate of these units is adjusted by controlling the operation of the units and the refrigerant lines of the shut-down units. Specifically, when the refrigerant level in the units with excessive refrigerant is detected, the opening of the flow control valves on the gas and liquid lines of the outdoor unit of the unit with excessive refrigerant is reduced. Alternatively, while reducing the opening of the flow control valves on the gas and liquid lines of the outdoor unit of the unit with excessive refrigerant, the liquid line of the shut-down unit is opened and the gas line is closed. Preferably, the flow control valves on the gas and liquid lines of the outdoor unit are electric ball valves. For units with excessive refrigerant, in addition to adjusting the opening of the flow control valves, the liquid line can be opened and the gas line closed simultaneously, preventing refrigerant from entering the shut-down unit and simultaneously discharging the refrigerant from the shut-down unit back into the system, thus resolving the refrigerant bias problem between units in the multi-split air conditioning system.

[0050] When the refrigerant level in the refrigerant-displacement unit is too low, the opening of the flow regulating valves on the gas and liquid lines of the outdoor unit is increased; the refrigerant level in the refrigerant-displacement unit is re-checked, and the decision on whether to start or stop the unit is based on the check results. Specifically, determining whether to start or stop the unit based on the check results includes: not starting the unit when the refrigerant level in the refrigerant-displacement unit is normal; and starting the unit when the refrigerant level in the refrigerant-displacement unit is too low.

[0051] When the unit is not turned on or off, the following steps are also included: controlling the liquid pipe of the outdoor unit of the refrigerant deflection unit to close and the gas pipe to open until the refrigerant quantity status of the refrigerant deflection unit is normal; when the unit is turned on or off, the following steps are also included: controlling the liquid pipe of the outdoor unit of the refrigerant deflection unit to open and the gas pipe to close until the refrigerant quantity status of the refrigerant deflection unit is normal.

[0052] In multi-split air conditioning systems, refrigerant flow discrepancies may occur between units due to varying capacity requirements, leading to unit shutdowns or refrigerant imbalances. When this happens, compressors with excess refrigerant may experience excessively high pressure and low discharge temperature, while compressors with insufficient refrigerant may experience low pressure and excessively high discharge temperature. This invention replaces the shut-off valves on the gas and liquid lines of the multi-split outdoor unit with an electric ball valve. This allows the shut-off unit to be restarted when a refrigerant shortage is detected, while simultaneously opening its liquid line and closing its gas line. This prevents refrigerant from entering the shut-off unit and simultaneously discharges the refrigerant from the shut-off unit back into the system, resolving the refrigerant flow discrepancy problem in multi-split air conditioning systems. Conversely, when a unit has excessive refrigerant, in addition to adjusting the flow control valve opening, its liquid line can be opened and its gas line closed simultaneously, preventing refrigerant from entering the shut-off unit and simultaneously discharging the refrigerant from the shut-off unit back into the system. In this case, the shut-off unit can be regulated without restarting. By combining the adjustment of the flow control valve opening with the shutdown of the unit, the amount of refrigerant entering the unit with excessive refrigerant is reduced, while the excess refrigerant in the system is transferred to the shut-down unit. This method offers greater flexibility and better adjustment results.

[0053] In a preferred embodiment 1 of the present invention, another method for controlling a multi-split air conditioning system is also provided. Specifically... Figure 2 An optional flowchart of the method is shown, such as Figure 2 As shown, the method includes the following steps S201-S215:

[0054] S201: There are out-of-service units in the system; when there are out-of-service units in the system, check whether there is refrigerant misflow between units;

[0055] S202: The compressor's high pressure is lower than T1℃ (e.g., 20℃), and the discharge temperature is higher than T2℃ (e.g., 95℃);

[0056] S203: Insufficient refrigerant; if the compressor's high pressure is lower than T1℃ and the discharge temperature is higher than T2℃, the compressor is determined to be in a refrigerant shortage state.

[0057] S204: Adjust the opening of the electric ball valve of the refrigerant deflection unit; at this time, the opening of the electric ball valve increases, and the opening of the electric ball valve is controlled according to the degree of deflection.

[0058] S205: Determine whether to restart the shut-down unit. If yes, proceed to step S206; otherwise, proceed to step S208.

[0059] S206: Open the gas pipe and close the liquid pipe; start the shutdown unit, and at the same time open its liquid pipe electric ball valve and close its gas pipe electric ball valve, so that the refrigerant in the shutdown unit can only go out and not come in, and at the same time discharge the refrigerant in the shutdown unit into the system for operation.

[0060] S207: Run for 5 minutes;

[0061] S208: Close the trachea, open the fluid line;

[0062] S209: After running for 3 minutes, the exhaust temperature is >103℃ and the low pressure is <15℃; the pressure here is expressed as the temperature value corresponding to the saturation pressure. When the unit is shut down and running for 3 minutes, and the exhaust temperature is >103℃ and the low pressure is <-15℃, the control is terminated.

[0063] S210: The compressor's high pressure is higher than T3℃, and the discharge temperature is lower than T4℃;

[0064] S211: Excessive refrigerant; if the compressor's high pressure is higher than T3℃ (e.g., 55℃) and the discharge temperature is lower than T4℃ (e.g., 70℃), the compressor is considered to have excessive refrigerant.

[0065] S212: Adjust the opening of the electric ball valve of the refrigerant deflection unit;

[0066] S213: Open the liquid pipe of the shut-down unit and close the gas pipe; close the gas pipe electric ball valve of the shut-down unit and open its liquid pipe electric ball valve, while reducing the opening of the refrigerant deflection unit's electric ball valve to reduce its refrigerant flow and achieve the purpose of regulation.

[0067] S214: Exhaust temperature 70~95℃, high pressure 20~55℃; when the exhaust temperature of the refrigerant-deflecting unit is >103℃ and the low pressure is <-15℃, control is deactivated.

[0068] S215: Exit control.

[0069] When a unit in a multi-split air conditioning system is shut down, it is determined whether refrigerant misflow exists. If refrigerant misflow exists, the refrigerant flow rate of the unit with misflow is adjusted by controlling the operation of the unit with misflow and the refrigerant lines of the shut-down unit. This solution, when refrigerant misflow occurs in the system, adjusts the refrigerant flow of the unit with misflow by controlling the operation of the unit with misflow and the refrigerant lines of the shut-down unit. This allows for quick and effective refrigerant regulation of the system. In addition to the self-regulation of the unit with misflow, it also ensures efficient utilization of the shut-down unit, regulates the refrigerant misflow, guarantees system stability, and improves system operating efficiency.

[0070] Example 2

[0071] Based on the multi-split air conditioning system control method provided in Embodiment 1 above, a multi-split air conditioning system control device is also provided in a preferred embodiment 2 of the present invention. Specifically, Figure 3 An alternative structural block diagram of the device is shown, such as... Figure 3 As shown, the device includes:

[0072] Detection module 302 is used to detect whether there are any units that have stopped operating in the multi-split air conditioning system;

[0073] The judgment module 304, connected to the detection module 302, is used to determine whether there is a refrigerant misflow unit in the multi-split air conditioning system when there is a shut-down unit.

[0074] The adjustment module 306, connected to the judgment module 304, is used to adjust the refrigerant flow of the refrigerant-biased unit by controlling the refrigerant pipeline of the refrigerant-biased unit when there is a refrigerant biased unit.

[0075] The above embodiments provide a control scheme for a multi-split air conditioning system. When a unit in the multi-split air conditioning system is shut down, it is determined whether refrigerant misflow exists. If refrigerant misflow exists, the refrigerant flow rate of the refrigerant misflow unit is adjusted by controlling the operation of the refrigerant misflow unit and the refrigerant piping of the shut-down unit. This scheme, when refrigerant misflow occurs in the system, adjusts the refrigerant flow rate of the refrigerant misflow unit by controlling its operation and the refrigerant piping of the shut-down unit. This allows for rapid and effective refrigerant regulation of the system. In addition to the self-regulation of the refrigerant misflow unit, it also ensures efficient utilization of the shut-down unit, regulates the refrigerant misflow situation, guarantees system stability, and improves system operating efficiency.

[0076] The judgment module 304 includes: a detection submodule for detecting the compressor operating parameters of each unit in the multi-split air conditioning system; a judgment submodule for determining the refrigerant quantity status of each unit based on the compressor operating parameters of each unit; and a determination submodule for determining whether there is a refrigerant misflow unit in the multi-split air conditioning system based on the refrigerant quantity status of each unit.

[0077] The compressor operating parameters include at least: high pressure and exhaust temperature; the refrigerant quantity status includes at least one of the following: insufficient refrigerant, normal refrigerant, and excessive refrigerant; the determination submodule includes: a first determination unit, used to determine that the refrigerant quantity status of the corresponding unit is insufficient refrigerant when the high pressure is lower than a first preset pressure value and the exhaust temperature is higher than a first preset temperature value; a second determination unit, used to determine that the refrigerant quantity status of the corresponding unit is excessive refrigerant when the high pressure is higher than a second preset pressure value and the exhaust temperature is lower than a second preset temperature value; wherein, the first preset pressure value is less than the second preset pressure value, and the first preset temperature value is greater than the second preset temperature value.

[0078] The determination submodule includes: a first determination unit, used to determine that there is a refrigerant misflow unit in the multi-split air conditioning system when the refrigerant quantity status of at least one unit is too low or too high; and a second determination unit, used to determine that there is no refrigerant misflow unit in the multi-split air conditioning system otherwise.

[0079] The adjustment module 306 includes:

[0080] The first regulating submodule is used to control the opening of the gas pipe and liquid pipe flow regulating valve of the outdoor unit of the refrigerant deflection unit to decrease when the refrigerant quantity of the refrigerant deflection unit is too much; or, while controlling the opening of the gas pipe and liquid pipe flow regulating valve of the outdoor unit of the refrigerant deflection unit to decrease, control the liquid pipe of the outdoor unit of the shutdown unit to open and the gas pipe to close.

[0081] The second regulation submodule is used to increase the opening of the flow regulating valves of the gas pipe and liquid pipe of the outdoor unit of the refrigerant deflection unit when the refrigerant quantity is too low.

[0082] The restart submodule is used to re-detect the refrigerant quantity status of the refrigerant-biased unit and determine whether to start or stop the unit based on the detection results.

[0083] The restart submodule includes: a first restart unit, used to prevent the shutdown unit from starting when the refrigerant level of the refrigerant-biased unit is normal; a second restart unit, used to start the shutdown unit when the refrigerant level of the refrigerant-biased unit is too low; a first control unit, used to control the liquid pipe of the outdoor unit of the refrigerant-biased unit to close and the gas pipe to open when the shutdown unit is not started, until the refrigerant level of the refrigerant-biased unit is normal; and a second control unit, used to control the liquid pipe of the outdoor unit of the refrigerant-biased unit to open and the gas pipe to close when the shutdown unit is started, until the refrigerant level of the refrigerant-biased unit is normal.

[0084] Regarding the apparatus in the above embodiments, the specific manner in which each unit and assembly performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0085] Example 3

[0086] Based on the multi-split air conditioning system control device provided in Embodiment 2 above, a preferred embodiment 3 of the present invention further provides a multi-split air conditioning system, including the multi-split air conditioning system control device as described above.

[0087] The above embodiments provide a control scheme for a multi-split air conditioning system. When a unit in the multi-split air conditioning system is shut down, it is determined whether refrigerant misflow exists. If refrigerant misflow exists, the refrigerant flow rate of the refrigerant misflow unit is adjusted by controlling the operation of the refrigerant misflow unit and the refrigerant piping of the shut-down unit. This scheme, when refrigerant misflow occurs in the system, adjusts the refrigerant flow rate of the refrigerant misflow unit by controlling its operation and the refrigerant piping of the shut-down unit. This allows for rapid and effective refrigerant regulation of the system. In addition to the self-regulation of the refrigerant misflow unit, it also ensures efficient utilization of the shut-down unit, regulates the refrigerant misflow situation, guarantees system stability, and improves system operating efficiency.

[0088] Example 4

[0089] Based on the multi-split air conditioning system control method provided in Embodiment 1 above, in the preferred embodiment 4 of the present invention, a storage medium containing computer-executable instructions is also provided. When executed by a computer processor, the computer-executable instructions are used to execute the multi-split air conditioning system control method as described above.

[0090] The above embodiments provide a control scheme for a multi-split air conditioning system. When a unit in the multi-split air conditioning system is shut down, it is determined whether refrigerant misflow exists. If refrigerant misflow exists, the refrigerant flow rate of the refrigerant misflow unit is adjusted by controlling the operation of the refrigerant misflow unit and the refrigerant piping of the shut-down unit. This scheme, when refrigerant misflow occurs in the system, adjusts the refrigerant flow rate of the refrigerant misflow unit by controlling its operation and the refrigerant piping of the shut-down unit. This allows for rapid and effective refrigerant regulation of the system. In addition to the self-regulation of the refrigerant misflow unit, it also ensures efficient utilization of the shut-down unit, regulates the refrigerant misflow situation, guarantees system stability, and improves system operating efficiency.

[0091] 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 application 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 invented by the invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0092] It should be understood that the present invention is not limited to the precise structure 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 control method for a multi-split air conditioning system, characterized in that, include: Check if any units in the multi-split air conditioning system are shut down; When the shut-down unit exists, determine whether the multi-split air conditioning system has a refrigerant misflow unit; When the refrigerant deflection unit is present, the refrigerant flow rate of the refrigerant deflection unit is adjusted by controlling the operation of the refrigerant deflection unit and the refrigerant pipeline of the shut-down unit. Adjusting the refrigerant flow rate of the refrigerant deflection unit by controlling its operation and the refrigerant piping of the shut-down unit includes: When the refrigerant quantity of the refrigerant-biased flow unit is excessive, the flow regulating valves of the gas pipe and liquid pipe of the outdoor unit of the refrigerant-biased flow unit are reduced, while the liquid pipe of the outdoor unit of the shutdown unit is opened and the gas pipe is closed. When the refrigerant quantity of the refrigerant-deflecting unit is too low, the opening of the flow regulating valves of the gas pipe and liquid pipe of the outdoor unit of the refrigerant-deflecting unit is increased; the refrigerant quantity of the refrigerant-deflecting unit is re-detected, and the shutdown unit is turned on or off based on the detection result. Determining whether to start the shutdown unit based on the test results includes: not starting the shutdown unit when the refrigerant quantity of the refrigerant deflection unit is normal; and starting the shutdown unit when the refrigerant quantity of the refrigerant deflection unit is too low. When the shut-down unit is not turned on, the liquid pipe of the outdoor unit of the refrigerant deflection unit is closed and the gas pipe is opened until the refrigerant quantity status of the refrigerant deflection unit is normal. When the shutdown unit is started, the liquid pipe of the outdoor unit of the refrigerant deflection unit is opened and the gas pipe is closed until the refrigerant quantity status of the refrigerant deflection unit is normal.

2. The method according to claim 1, characterized in that, Determining whether the multi-split air conditioning system has a refrigerant misflow unit includes: Detect the compressor operating parameters of each unit in the multi-split air conditioning system; The refrigerant quantity status of each unit is determined based on the compressor operating parameters of each unit. The presence of refrigerant misflow units in the multi-split air conditioning system is determined based on the refrigerant quantity status of each unit.

3. The method according to claim 2, characterized in that, The compressor operating parameters include: high pressure and discharge temperature; the refrigerant quantity status includes: insufficient refrigerant, normal refrigerant, and excessive refrigerant; the refrigerant quantity status of each unit is determined based on the compressor operating parameters of each unit, including: When the high pressure is lower than the first preset pressure value and the exhaust temperature is higher than the first preset temperature value, the refrigerant quantity status of the corresponding unit is determined to be insufficient refrigerant quantity; When the high pressure is higher than the second preset pressure value and the exhaust temperature is lower than the second preset temperature value, the refrigerant quantity status of the corresponding unit is determined to be excessive refrigerant quantity; wherein, the first preset pressure value is less than the second preset pressure value, and the first preset temperature value is greater than the second preset temperature value.

4. The method according to claim 3, characterized in that, Determining whether there are refrigerant misflow units in the multi-split air conditioning system based on the refrigerant quantity status of each unit includes: When the refrigerant quantity status of at least one unit is too low or too high, it is determined that there is a refrigerant misflow unit in the multi-split air conditioning system. Otherwise, it is determined that the multi-split air conditioning system does not have a refrigerant misflow unit.

5. A control device for a multi-split air conditioning system, characterized in that, include: The detection module is used to detect whether any units in a multi-split air conditioning system are shut down. The judgment module is used to determine whether there is a refrigerant misflow unit in the multi-split air conditioning system when the shut-down unit exists; The regulating module is used to regulate the refrigerant flow rate of the refrigerant deflection unit by controlling the operation of the refrigerant deflection unit and the refrigerant pipeline of the shut-down unit when the refrigerant deflection unit is present. The adjustment module includes: The first regulating submodule is used to control the flow regulating valves of the gas pipe and liquid pipe of the outdoor unit of the refrigerant deflection unit to decrease when the refrigerant quantity of the refrigerant deflection unit is too high, while controlling the liquid pipe of the outdoor unit of the shutdown unit to open and the gas pipe to close. The second regulation submodule is used to increase the opening of the flow regulating valves of the gas pipe and liquid pipe of the outdoor unit of the refrigerant deflection unit when the refrigerant quantity is too low. The restart submodule is used to re-detect the refrigerant quantity status of the refrigerant-biased unit and determine whether to start the shut-down unit based on the detection results; The restart submodule includes: a first restart unit, used to prevent the shutdown unit from starting when the refrigerant level of the refrigerant-biased unit is normal; a second restart unit, used to start the shutdown unit when the refrigerant level of the refrigerant-biased unit is too low; a first control unit, used to control the liquid pipe of the outdoor unit of the refrigerant-biased unit to close and the gas pipe to open when the shutdown unit is not started, until the refrigerant level of the refrigerant-biased unit is normal; and a second control unit, used to control the liquid pipe of the outdoor unit of the refrigerant-biased unit to open and the gas pipe to close when the shutdown unit is started, until the refrigerant level of the refrigerant-biased unit is normal.

6. A multi-split air conditioning system, characterized in that, Includes the multi-split air conditioning system control device as described in claim 5.

7. A storage medium containing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a computer processor, are used to perform the multi-split air conditioning system control method as described in any one of claims 1 to 4.

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