Multi-connected system control method, system, device, equipment and storage medium

Abstract

Embodiments of the present application relate to a kind of multi-connected system control method, system, device, equipment and storage medium, the method comprises: the liquid accumulator of the system is controlled to execute store refrigerant action;When store refrigerant action is executed and completes, and the system is stable, the energy efficiency change condition of current system is obtained;According to the energy efficiency change condition, the liquid accumulator is controlled to execute store refrigerant action, or, according to the energy efficiency change condition, the liquid accumulator is controlled to execute discharge refrigerant action, to make the energy efficiency reach highest. Therefore, according to the energy efficiency change condition, control system executes store refrigerant action or discharge refrigerant action, realize through energy efficiency change adjustment refrigerant amount in liquid accumulator, to make system energy efficiency reach best, the energy efficiency of multi-connected system is optimized.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of multi-split air conditioning system technology, and in particular to a multi-split air conditioning system control method, device, equipment and storage medium. Background Technology

[0002] Existing multi-split air conditioning systems commonly face the problem of insufficient refrigerant flow regulation. Multi-split systems connect multiple indoor units and one or more outdoor units, with refrigerant circulating among these devices. Traditional multi-split systems typically rely on a fixed refrigerant flow rate to maintain system operation. However, due to variations in ambient temperature, load fluctuations, and different operating conditions, a fixed refrigerant flow rate cannot meet the optimal needs under different circumstances. This lack of flexible refrigerant flow adjustment leads to the system operating under uneven loads and insufficient energy efficiency, thus affecting the overall system efficiency and energy-saving performance.

[0003] While some refrigerant flow adjustment schemes exist in the current technology, they often cannot dynamically adjust the refrigerant volume based on real-time energy efficiency and system load changes. Therefore, how to optimize the energy efficiency of multi-split systems has become an urgent problem to be solved. Summary of the Invention

[0004] In view of this, in order to solve the above-mentioned technical problems of optimizing the energy efficiency of multi-split air conditioning systems, embodiments of the present invention provide a multi-split air conditioning system control method, device, equipment and storage medium.

[0005] In a first aspect, embodiments of the present invention provide a control method for a multi-unit air conditioning system, comprising:

[0006] Control the system's liquid receiver to perform the refrigerant storage action;

[0007] Once the refrigerant storage action is completed and the system is operating stably, the current energy efficiency change of the system is obtained.

[0008] The system controls the liquid receiver to perform a refrigerant storage action based on the energy efficiency changes, or controls the liquid receiver to perform a refrigerant discharge action based on the energy efficiency changes, so as to maximize the energy efficiency.

[0009] In one possible implementation, controlling the system's receiver to perform a refrigerant storage action includes:

[0010] The liquid inlet valve and the gas balance valve at the top of the liquid receiver are opened, and the liquid drain valve at the bottom of the liquid receiver is closed, so that the refrigerant flows into the liquid receiver through the liquid inlet valve. The gas balance valve is used to discharge the gaseous refrigerant in the liquid receiver, and the liquid drain valve is used to discharge the liquid refrigerant in the liquid receiver.

[0011] After a first time interval, the liquid inlet valve and the gas balance valve are closed.

[0012] In one possible implementation, obtaining the current energy efficiency change of the system includes:

[0013] Obtain the first energy efficiency before performing the refrigerant storage action, and obtain the second energy efficiency after the system is running stably;

[0014] When the second energy efficiency is greater than the first energy efficiency, the energy efficiency change is determined to be an energy efficiency improvement; when the second energy efficiency is less than or equal to the first energy efficiency, the energy efficiency change is determined to be no energy efficiency improvement.

[0015] In one possible implementation, controlling the liquid receiver to perform a refrigerant discharge action based on the energy efficiency change includes:

[0016] When the energy efficiency change is that the energy efficiency has not improved, a refrigerant discharge action is performed, which involves controlling the drain valve to open.

[0017] Once the refrigerant discharge operation is completed and the system is operating stably, the step of obtaining the current energy efficiency change of the system is repeated.

[0018] When the energy efficiency change indicates an improvement in energy efficiency, the refrigerant discharge action is repeated until the energy efficiency change indicates no improvement in energy efficiency. Then, the refrigerant storage action is performed once and the control ends.

[0019] In one possible implementation, controlling the liquid receiver to perform refrigerant storage based on the energy efficiency changes includes:

[0020] When the energy efficiency change is an improvement in energy efficiency, the refrigerant storage action and the step of obtaining the energy efficiency change are repeated.

[0021] Control will continue until the energy efficiency status shows no improvement, at which point a refrigerant discharge action will be performed and then terminated.

[0022] In one possible implementation, the method further includes:

[0023] When the energy efficiency change after the first execution of the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference, the refrigerant storage action is repeated until the energy efficiency change is no improvement in energy efficiency, then the refrigerant discharge action is executed once and the control ends.

[0024] Alternatively, when the energy efficiency change after performing the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, the control ends.

[0025] In one possible implementation, the method further includes:

[0026] If the energy efficiency does not improve after the first refrigerant storage action, then perform a refrigerant discharge action.

[0027] Once the system is running stably, if the difference between the second energy efficiency and the first energy efficiency is greater than the preset difference, the refrigerant discharge action is repeated until the energy efficiency change is no longer improved. Then, the refrigerant storage action is performed once and the control ends.

[0028] Alternatively, once the system is running stably, if the energy efficiency change after the refrigerant discharge action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, then control is terminated.

[0029] Secondly, embodiments of the present invention provide a multi-unit air conditioning system, comprising:

[0030] Storage tank, inlet valve, gas balance valve, and drain valve;

[0031] One end of the top of the liquid storage tank is connected to one end of the liquid inlet valve, the other end of the top of the liquid storage tank is connected to one end of the gas balance valve, and one end of the bottom of the liquid storage tank is connected to one end of the liquid outlet valve.

[0032] The other end of the inlet valve is connected to the liquid-side main pipe on the medium-pressure side. The inlet valve is used to allow refrigerant to flow into the reservoir when the refrigerant storage is activated.

[0033] The other end of the gas balance valve and the other end of the drain valve are connected to the pipeline on the low-pressure side.

[0034] The gas balance valve is used to discharge the gaseous refrigerant in the liquid receiver when the refrigerant storage is activated, and the drain valve is used to discharge the liquid refrigerant in the liquid receiver when the refrigerant discharge is activated.

[0035] Thirdly, embodiments of the present invention provide a control device for a multi-unit air conditioning system, comprising:

[0036] The control module is used to control the liquid receiver of the system to perform the refrigerant storage action;

[0037] The acquisition module is used to acquire the current energy efficiency change of the system after the refrigerant storage action is completed and the system is running stably.

[0038] The control module is also used to control the liquid receiver to perform a refrigerant storage action according to the energy efficiency change, or to control the liquid receiver to perform a refrigerant discharge action according to the energy efficiency change, so as to maximize the energy efficiency.

[0039] Fourthly, embodiments of the present invention provide a computer device, including: a processor and a memory, wherein the processor is configured to execute a multi-system control program stored in the memory to implement the multi-system control method described in any one of the first aspects.

[0040] Fifthly, embodiments of the present invention provide a storage medium storing one or more programs, which can be executed by one or more processors to implement the multi-unit system control method described in any of the first aspects above.

[0041] The multi-split air conditioning system control scheme provided in this invention controls the system's refrigerant receiver to perform a refrigerant storage action. After the refrigerant storage action is completed and the system is operating stably, the system's energy efficiency changes are acquired. Based on these energy efficiency changes, the system controls the refrigerant receiver to either store or discharge refrigerant, thereby maximizing energy efficiency. Thus, by controlling the system to store or discharge refrigerant based on energy efficiency changes, the amount of refrigerant in the receiver can be adjusted to optimize system energy efficiency, thereby improving the overall energy efficiency of the multi-split air conditioning system. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of a multi-unit air conditioning system provided in an embodiment of the present invention;

[0043] Figure 2 A schematic diagram of the refrigerant flow path in a multi-split air conditioning system provided in an embodiment of the present invention;

[0044] Figure 3 A schematic diagram of the refrigerant discharge operation flow path of a multi-split air conditioning system provided in an embodiment of the present invention;

[0045] Figure 4 A schematic diagram of the cooling flow path of a multi-split air conditioning system provided in an embodiment of the present invention;

[0046] Figure 5 This is a schematic diagram of the heating flow path of a multi-split air conditioning system provided in an embodiment of the present invention;

[0047] Figure 6 A flowchart illustrating a multi-unit air conditioning system control method provided in an embodiment of the present invention;

[0048] Figure 7 A flowchart illustrating another multi-unit system control method provided in an embodiment of the present invention;

[0049] Figure 8 This is a schematic diagram illustrating the first type of energy efficiency variation provided in an embodiment of the present invention;

[0050] Figure 9 This is a schematic diagram illustrating a second type of energy efficiency variation provided in an embodiment of the present invention;

[0051] Figure 10 A flowchart illustrating another multi-unit system control method provided in an embodiment of the present invention;

[0052] Figure 11 This is a schematic diagram illustrating the third type of energy efficiency variation provided in this embodiment of the invention;

[0053] Figure 12 This is a schematic diagram illustrating the fourth type of energy efficiency change provided in this embodiment of the invention;

[0054] Figure 13 A schematic diagram of the structure of a multi-unit air conditioning system control device provided in this embodiment of the invention;

[0055] Figure 14 This is a schematic diagram of the structure of a computer device provided in an embodiment of the present invention. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] To facilitate understanding of the embodiments of the present invention, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of the present invention.

[0058] Figure 1 This is a schematic diagram of a multi-split air conditioning system provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the system specifically includes:

[0059] 301 Liquid storage tank, 302 Liquid inlet valve, 303 Gas balance valve and 304 Liquid drain valve;

[0060] One end of the top of the storage tank is connected to one end of the inlet valve, the other end of the top of the storage tank is connected to one end of the gas balance valve, and one end of the bottom of the storage tank is connected to one end of the drain valve.

[0061] The other end of the inlet valve is connected to the liquid-side main pipe on the medium-pressure side. The inlet valve is used to allow refrigerant to flow into the receiver when the refrigerant is activated.

[0062] The other end of the gas balance valve and the other end of the drain valve are connected to the pipeline on the low-pressure side;

[0063] The gas balance valve is used to discharge the gaseous refrigerant in the receiver when the refrigerant storage is activated, and the drain valve is used to discharge the liquid refrigerant in the receiver when the refrigerant discharge is activated.

[0064] In this embodiment, as Figure 1 As shown, the multi-split system also includes: 101 compressor, 102 four-way valve, 103 outdoor heat exchanger, 104 upper heating expansion valve, 105 lower heating expansion valve, 106 gas-liquid separator, 201 first pipeline, 202 second pipeline, 203 third pipeline, 204 fourth pipeline, 205 liquid side main pipe, 206 gas side main pipe, and 305 unloading valve.

[0065] The 301 liquid storage tank is connected to the 205 liquid-side main pipe via the 302 inlet valve, and to the 203 third pipe via the 303 gas balance valve and the 304 drain valve. Since the 205 liquid-side main pipe is always on the medium-pressure side in both cooling and heating modes, while the 203 third pipe is always on the low-pressure side, the liquid storage tank has a medium-pressure side at the inlet and a low-pressure side at the drain. This pressure difference ensures sufficient inlet and outlet power.

[0066] The piping related to the 302 inlet valve is connected to the top of the 301 liquid storage tank. When the 302 inlet valve is opened, the refrigerant enters from the top of the 301 liquid storage tank with minimal resistance. After entering, the refrigerant separates into gas and liquid phases, with the upper part being gaseous and the lower part being liquid.

[0067] The piping related to the 303 gas balance valve is also connected to the top of the 301 liquid storage tank. During the liquid filling process, if the 303 gas balance valve is closed, the pressure in the liquid storage tank will gradually increase as the filling process continues, making it difficult for refrigerant to enter the tank. If the 303 gas balance valve is opened at this time, the gaseous refrigerant at the top of the liquid storage tank is connected to the low-pressure side. Excess gaseous refrigerant flows to the low-pressure side under the pressure difference, thereby reducing the pressure in the liquid storage tank and maintaining the filling power. Furthermore, since the inflow rate is always much greater than the outflow rate of gaseous refrigerant through the 303 gas balance valve, this is still considered a refrigerant filling state.

[0068] The 304 drain valve and related pipelines are connected to the bottom of the storage tank. When the 304 drain valve is opened, the liquid refrigerant is discharged from the storage tank under the pressure difference between the storage tank pressure and the low pressure.

[0069] Therefore, the control methods for the liquid storage tank during refrigerant storage and refrigerant discharge are as follows:

[0070] Figure 2 A schematic diagram of the refrigerant flow path in a multi-split air conditioning system provided in this embodiment of the invention, and Figure 3 This is a schematic diagram of the refrigerant discharge flow path for a multi-split air conditioning system, provided as an embodiment of the present invention. Figure 2The refrigerant storage operation of the liquid storage tank is as follows: simultaneously open the 302 inlet valve and the 303 gas balance valve, and close the 304 drain valve, so that the refrigerant flows into the liquid storage tank through the inlet valve, and at the same time discharges the gaseous refrigerant through the gas balance valve, and closes after time t1; Figure 3 The refrigerant discharge action of the liquid storage tank shown is to open the drain valve to discharge the refrigerant, and then close it after time t2. t1 and t2 are the preset action time parameters of the system.

[0071] In one possible implementation, Figure 4 This is a schematic diagram of the cooling flow path of a multi-split air conditioning system provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of the heating flow path of a multi-split air conditioning system provided in an embodiment of the present invention.

[0072] Figure 4 The refrigeration flow path is as follows: the refrigerant discharged from the compressor (101) enters the second pipeline (202) via the four-way valve (102), condenses in the outdoor heat exchanger (103), and then enters the indoor side for evaporation and refrigeration via the liquid-side main pipe (205). The refrigerated refrigerant returns to the outdoor side via the gas-side main pipe (206), and then returns to the gas-liquid separator (106) and compressor (101) via the four-way valve (102).

[0073] Figure 5 The heating flow path is as follows: the refrigerant discharged from the compressor 101 enters the indoor side for condensation and heating via the four-way valve 102 and the gas-side main pipe 206. After heating, the refrigerant returns to the outdoor side via the liquid-side main pipe 205, evaporates in the outdoor heat exchanger 103, and then returns to the gas-liquid separator 106 and the compressor 101 via the four-way valve 102.

[0074] In both the refrigeration and heating flow paths, the liquid inlet side of the 301 liquid storage tank (302 liquid inlet valve and its pipeline) is connected to the 205 liquid side main pipe and is always under medium pressure. Meanwhile, the gas balance side (303 gas balance valve and its pipeline) and the drain side (304 drain valve and its pipeline) of the 301 liquid storage tank are connected to the 203 third pipeline and are always under low pressure.

[0075] The multi-split air conditioning system provided in this invention can maintain a certain pressure difference between the inlet and outlet sides of the liquid storage tank by setting the inlet side to have medium pressure and the outlet side to have low pressure, ensuring sufficient inlet and outlet power. At the same time, a gas balance valve with low pressure is set at the top of the liquid storage tank to discharge the gaseous refrigerant in the upper part of the liquid storage tank through the gas pressure difference, thereby reducing the pressure of the liquid storage tank and maintaining the inlet power. This ensures that the multi-split air conditioning system can flexibly adjust the amount of refrigerant in the liquid storage tank and ensures smooth operation during refrigerant inlet and outlet.

[0076] Figure 6 A flowchart illustrating a multi-unit air conditioning system control method provided in this embodiment of the invention is shown below. Figure 6 As shown, the method specifically includes:

[0077] S11, The liquid receiver of the control system performs the action of storing refrigerant;

[0078] S12. After the refrigerant storage action is completed and the system is running stably, obtain the current energy efficiency change of the system.

[0079] S13. Control the liquid receiver to perform refrigerant storage action according to the energy efficiency change, or control the liquid receiver to perform refrigerant discharge action according to the energy efficiency change, so as to achieve the highest energy efficiency.

[0080] The multi-unit system control method provided in this embodiment of the invention is applied to, for example, Figure 1 The multi-split system shown specifically controls the refrigerant storage or discharge actions based on changes in energy efficiency, thereby adjusting the amount of refrigerant in the storage tank to achieve optimal system energy efficiency.

[0081] In this embodiment, after the system is powered on, it is necessary to control the system's liquid receiver to perform a refrigerant storage action, specifically including:

[0082] The system controls the opening of the inlet valve and the gas balance valve at the top of the receiver, and the closing of the drain valve at the bottom of the receiver, to allow refrigerant to flow into the receiver through the inlet valve. The gas balance valve is used to discharge gaseous refrigerant from the receiver, and the drain valve is used to discharge liquid refrigerant from the receiver. After a preset first time interval, the system controls the closing of the inlet valve and the gas balance valve. This completes the refrigerant storage process.

[0083] Furthermore, to determine if the system is operating stably, a fixed waiting time is set. That is, after the refrigerant storage process ends and a fixed interval has elapsed, the system is considered to have reached a new steady state, and then the system's energy efficiency is observed. Alternatively, a new steady state can be determined when system parameters no longer change; for example, parameters such as high pressure, low pressure, compressor frequency, and indoor unit expansion valve opening no longer change. Or, a new steady state can be determined when the system's energy efficiency no longer changes.

[0084] Furthermore, the system's energy efficiency is obtained by dividing the system's current cooling / heating capacity by the system's current power.

[0085] When the system is running stably, obtain the current energy efficiency changes of the system, including:

[0086] The system obtains the first energy efficiency before performing the refrigerant storage action and the second energy efficiency after the system is running stably. When the second energy efficiency is greater than the first energy efficiency, the energy efficiency change is determined to be an energy efficiency improvement. When the second energy efficiency is less than or equal to the first energy efficiency, the energy efficiency change is determined to be no energy efficiency improvement.

[0087] If the action performed is refrigerant discharge, obtain the current system energy efficiency changes, including:

[0088] The system obtains the first energy efficiency before the refrigerant discharge action and the second energy efficiency after the system is running stably. When the second energy efficiency is greater than the first energy efficiency, the energy efficiency change is determined to be an energy efficiency improvement. When the second energy efficiency is less than or equal to the first energy efficiency, the energy efficiency change is determined to be no energy efficiency improvement.

[0089] Furthermore, based on changes in energy efficiency, the refrigerant storage or discharge actions of the receiver are dynamically adjusted. If the current energy efficiency improves, the currently executed action is repeated; if the current energy efficiency does not improve, the opposite action is executed. For example, if refrigerant storage is completed and energy efficiency improves, the refrigerant storage action is repeated; if energy efficiency does not improve, the refrigerant discharge action is executed. Thus, this energy efficiency-based adjustment mechanism can automatically realize the refrigerant storage or discharge operation of the receiver. Through this dynamic adjustment mechanism, the system can adapt to changes in environment and load, achieving optimal matching between refrigerant quantity and energy efficiency, and avoiding the impact on system performance due to excessive or insufficient refrigerant.

[0090] In one possible implementation, such as Figure 7 The diagram shown is a flowchart of another multi-unit air conditioning system control method provided by an embodiment of the present invention. The method specifically includes:

[0091] Based on changes in energy efficiency, the receiver is controlled to perform refrigerant storage actions, including:

[0092] When the energy efficiency change indicates an improvement in energy efficiency, repeat the refrigerant storage action and repeat the steps to obtain the energy efficiency change information.

[0093] Control will continue until the energy efficiency status shows no improvement, at which point a refrigerant discharge action will be performed and then terminated.

[0094] Based on changes in energy efficiency, the receiver is controlled to perform refrigerant discharge, including:

[0095] When the energy efficiency change indicates no improvement, the refrigerant discharge action is executed. The refrigerant discharge action involves opening the drain valve. After the refrigerant discharge action is completed and the system is running stably, the step of obtaining the current system energy efficiency change is repeated. When the energy efficiency change indicates an improvement, the refrigerant discharge action is repeated until the energy efficiency change indicates no improvement. Then, the refrigerant storage action is executed once and the control ends.

[0096] In this embodiment, 1. Perform the refrigerant storage action (S101), wait for the system to stabilize (S102), observe the system energy efficiency (φ), and obtain the energy efficiency change (S103).

[0097] 2. If the system energy efficiency is improved, the refrigerant storage action is performed (S104); if the system energy efficiency is not improved, the refrigerant discharge action is performed (S105).

[0098] Among them, "whether the energy efficiency has been improved" refers to whether the system energy efficiency obtained after the refrigerant storage operation is completed and the system is stable is improved compared with the energy efficiency before the refrigerant storage operation.

[0099] If the system's energy efficiency improves, it means that storing refrigerant helps improve energy efficiency, but the energy efficiency has not yet reached its optimal level. Therefore, we should continue to try storing refrigerant to observe whether it can further improve energy efficiency.

[0100] If the system energy efficiency does not improve, it means that storing refrigerant will lead to a decrease in system energy efficiency and the system is in a state of insufficient refrigerant circulation. The receiver should discharge refrigerant to increase the refrigerant circulation. Therefore, the process enters S105 to perform the refrigerant discharge action.

[0101] 3. After entering S104 from S103, wait for the system to stabilize again (S106) and observe whether the system energy efficiency is improved (S107). If the energy efficiency is improved, return to S104 and execute the next judgment and action cycle. If the energy efficiency is not improved, execute a refrigerant discharge action (S108) and exit control (S112).

[0102] If energy efficiency is improved, it means that there is still room for improvement in energy efficiency. Therefore, return to S104 to make judgments and take actions in the next cycle.

[0103] If energy efficiency is not improved, it indicates that too much refrigerant was stored after this refrigerant storage, and the system was already in its optimal operating state before this refrigerant storage. Therefore, a refrigerant discharge action is performed to restore the refrigerant state to the state before this action, so that the energy efficiency returns to the optimal state before this action.

[0104] Therefore, we get the following: Figure 8 The diagram shows the first type of energy efficiency change. After the first refrigerant storage action, the energy efficiency increases. After the second refrigerant storage action, the energy efficiency increases again. Therefore, the third refrigerant storage action is performed, after which the energy efficiency decreases. Then, the refrigerant discharge action is performed again to restore the energy efficiency to the optimal level before the control ends.

[0105] 4. After entering S105 from S103, wait for the system to stabilize again (S109) and observe whether the system energy efficiency is improved (S110). If the energy efficiency is improved, return to S105 and execute the next judgment and action cycle. If the energy efficiency is not improved, execute a refrigerant storage action (S111) and exit control (S112).

[0106] If energy efficiency is improved, it means that there is still room for improvement in energy efficiency. Therefore, return to S205 to make judgments and take actions in the next cycle.

[0107] If the energy efficiency is not improved, it means that there is too much refrigerant circulating in the system after this refrigerant discharge, and the optimal energy efficiency cannot be achieved. Therefore, a refrigerant storage action is performed to restore the refrigerant state to the state before this action, so that the energy efficiency returns to the optimal state before this action.

[0108] Therefore, we get the following: Figure 9 The diagram illustrates the second type of energy efficiency change. After the first refrigerant storage action, the energy efficiency decreases, indicating that a refrigerant discharge action is needed to improve energy efficiency. After the first refrigerant discharge action, the energy efficiency increases, so a second refrigerant discharge action is performed. After the second action, the energy efficiency increases, so a third refrigerant discharge action is performed. After the third action, the energy efficiency decreases, and a refrigerant storage action is performed again to restore the energy efficiency to its optimal level before the control ends.

[0109] In one possible implementation, such as Figure 10 The diagram shown is a flowchart illustrating another multi-unit air conditioning system control method provided by an embodiment of the present invention. The method includes:

[0110] If the energy efficiency changes after the first refrigerant storage action are improved, and the difference between the second and first energy efficiency is greater than the preset difference, the refrigerant storage action is repeated until the energy efficiency changes are no longer improved. Then, the refrigerant discharge action is performed once and the control ends.

[0111] Alternatively, if the energy efficiency change after performing the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to the preset difference, the control will end.

[0112] If the energy efficiency does not improve after the first refrigerant storage action, then perform a refrigerant discharge action.

[0113] Once the system is running stably, if the difference between the second energy efficiency and the first energy efficiency exceeds the preset difference, the refrigerant discharge action will be repeated until the energy efficiency changes and no improvement is observed. Then, the refrigerant storage action will be performed once and the control will end.

[0114] Alternatively, once the system is running stably, if the energy efficiency change after the refrigerant discharge action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to the preset difference, then control will end.

[0115] In this embodiment, 1. Perform the refrigerant storage action (S201), wait for the system to stabilize (S202), and then observe the changes in system energy efficiency (S203).

[0116] 2. If the system energy efficiency is not improved, the refrigerant discharge action is performed (S204). If the system energy efficiency is improved, the difference between the first energy efficiency and the second energy efficiency is taken as the energy efficiency improvement value Δφ, and the energy efficiency improvement value Δφ is compared with the preset difference φa (S205).

[0117] "Preset difference φa" is a system preset value used to determine whether the energy efficiency improvement is significant. A threshold can also be set based on the energy efficiency improvement ratio. In this case, when the energy efficiency improvement ratio, that is, the change ratio of the energy efficiency after the refrigerant storage action to the energy efficiency before the action, is greater than the threshold φa, the energy efficiency improvement is considered significant.

[0118] 3. After entering S205, if the energy efficiency improvement value Δφ>φa, then execute the refrigerant storage action (S206) and wait for the system to stabilize again (S207). If the energy efficiency improvement value Δφ≤φa, it means that the system energy efficiency improvement has approached the maximum value and no further adjustment is needed. Exit control (S216).

[0119] 4. After entering S207, observe whether the system energy efficiency has improved after the system stabilizes (S208). If the energy efficiency has improved, return to S205 and execute the next judgment and action cycle. If the energy efficiency has not improved, execute a refrigerant discharge action (S209) and exit control (S216).

[0120] Therefore, we get the following: Figure 11 The diagram illustrating the third type of energy efficiency change shows that after the first refrigerant storage action is completed, energy efficiency improves. Once the system stabilizes, if the energy efficiency improvement is greater than φa, a second refrigerant storage action is performed. After the second refrigerant storage action is completed, energy efficiency improves again. Once the system stabilizes, if the energy efficiency improvement is greater than φa, a third refrigerant storage action is performed. After the third refrigerant storage action is completed, energy efficiency improves again. Once the system stabilizes, if the energy efficiency improvement is less than φa, the system's energy efficiency improvement is considered to have approached its maximum value, and control is deactivated.

[0121] And obtain such Figure 12 The diagram illustrating the fourth energy efficiency change scenario shows that after the first refrigerant storage action is completed, energy efficiency improves. Once the system stabilizes, if the energy efficiency improvement is greater than φa, a second refrigerant storage action is performed. After the second refrigerant storage action is completed, energy efficiency improves again. Once the system stabilizes, if the energy efficiency decreases, a refrigerant discharge action is performed, and control is deactivated.

[0122] 5. After proceeding from step S203 to step S204 to perform the refrigerant discharge action, wait for the system to stabilize (S210), and then compare the energy efficiency improvement value Δφ with the preset difference φa (S211). If the energy efficiency improvement value Δφ > φa, then perform the refrigerant discharge action (S212) and wait for the system to stabilize (S213). If the energy efficiency improvement value Δφ ≤ φa, it indicates that the system energy efficiency improvement has approached its maximum value, no further adjustment is needed, and control is exited (S216).

[0123] 6. After entering S213, observe whether the system energy efficiency has improved after the system stabilizes (S214). If the energy efficiency has improved, return to S211 and execute the next judgment and action cycle. If the energy efficiency has not improved, execute a refrigerant storage action (S215) and exit control (S216).

[0124] The multi-split air conditioning system control method provided in this invention controls the system's receiver to perform a refrigerant storage action. After the refrigerant storage action is completed and the system is running stably, the method acquires the current system energy efficiency changes. Based on the energy efficiency changes, the method controls the receiver to either store refrigerant or discharge refrigerant to maximize energy efficiency. Therefore, it can determine whether to continue adjusting the refrigerant quantity based on the energy efficiency changes. If energy efficiency decreases after adjusting the refrigerant quantity, a reverse refrigerant adjustment is performed to restore the refrigerant state to its state before the previous adjustment, and it is considered that no further refrigerant adjustment is needed, thus exiting control. This optimizes the energy efficiency of the multi-split air conditioning system during operation, improving its working efficiency.

[0125] Figure 13 A schematic diagram of the structure of a multi-unit air conditioning system control device provided in this embodiment of the invention is shown below. Figure 13 As shown, the device specifically includes:

[0126] Control module 31 is used to control the liquid receiver of the system to perform the refrigerant storage action;

[0127] The acquisition module 32 is used to acquire the current energy efficiency change of the system after the refrigerant storage action is completed and the system is running stably.

[0128] The control module 31 is also used to control the liquid receiver to perform a refrigerant storage action according to the energy efficiency change, or to control the liquid receiver to perform a refrigerant discharge action according to the energy efficiency change, so as to maximize the energy efficiency.

[0129] In one possible implementation, the control module is specifically used to control the opening of the inlet valve and the gas balance valve at the top of the liquid reservoir, and to control the closing of the drain valve at the bottom of the liquid reservoir, so that refrigerant flows into the liquid reservoir through the inlet valve, the gas balance valve is used to discharge the gaseous refrigerant in the liquid reservoir, and the drain valve is used to discharge the liquid refrigerant in the liquid reservoir.

[0130] After a first time interval, the liquid inlet valve and the gas balance valve are closed.

[0131] In one possible implementation, the acquisition module is specifically used to acquire the first energy efficiency before performing the refrigerant storage action, and to acquire the second energy efficiency after the system has stabilized.

[0132] When the second energy efficiency is greater than the first energy efficiency, the energy efficiency change is determined to be an energy efficiency improvement; when the second energy efficiency is less than or equal to the first energy efficiency, the energy efficiency change is determined to be no energy efficiency improvement.

[0133] In one possible implementation, the control module is specifically used to perform a refrigerant discharge action when the energy efficiency change is that the energy efficiency has not improved. The refrigerant discharge action is to control the drain valve to open.

[0134] Once the refrigerant discharge operation is completed and the system is operating stably, the step of obtaining the current energy efficiency change of the system is repeated.

[0135] When the energy efficiency change indicates an improvement in energy efficiency, the refrigerant discharge action is repeated until the energy efficiency change indicates no improvement in energy efficiency. Then, the refrigerant storage action is performed once and the control ends.

[0136] In one possible implementation, the control module is specifically used to repeatedly execute the refrigerant storage action and repeatedly execute the step of acquiring the energy efficiency change when the energy efficiency change is an improvement.

[0137] Control will continue until the energy efficiency status shows no improvement, at which point a refrigerant discharge action will be performed and then terminated.

[0138] In one possible implementation, the control module is further configured to repeat the refrigerant storage action when the energy efficiency change after the first execution of the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference, until the energy efficiency change is no improvement in energy efficiency, and then execute a refrigerant discharge action once to end the control.

[0139] Alternatively, when the energy efficiency change after performing the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, the control ends.

[0140] In one possible implementation, the control module is further configured to perform a refrigerant discharge action when the energy efficiency change after the first refrigerant storage action is no improvement.

[0141] Once the system is running stably, if the difference between the second energy efficiency and the first energy efficiency is greater than the preset difference, the refrigerant discharge action is repeated until the energy efficiency change is no longer improved. Then, the refrigerant storage action is performed once and the control ends.

[0142] Alternatively, once the system is running stably, if the energy efficiency change after the refrigerant discharge action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, then control is terminated.

[0143] The multi-unit system control device provided in this embodiment can be as follows: Figure 13 The apparatus shown can perform, for example Figure 6 All steps of the control method for multi-split air conditioning systems, thereby achieving Figure 6 For details on the technical effects of the multi-unit system control method shown, please refer to [link / reference]. Figure 6 The relevant descriptions are presented concisely and will not be elaborated upon here.

[0144] Figure 14 This is a schematic diagram of the structure of a computer device provided in an embodiment of the present invention. Figure 14 The computer device 400 shown includes at least one processor 401, a memory 402, at least one network interface 404, and other user interfaces 403. The various components in the computer device 400 are coupled together via a bus system 405. It is understood that the bus system 405 is used to implement communication between these components. In addition to a data bus, the bus system 405 also includes a power bus, a control bus, and a status signal bus. However, for clarity, ... Figure 14 The general designated all buses as Bus System 405.

[0145] The user interface 403 may include a display, keyboard, or clicking device (e.g., mouse, trackball, touchpad, or touchscreen).

[0146] It is understood that the memory 402 in the embodiments of the present invention can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 402 described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0147] In some implementations, memory 402 stores elements, executable units or data structures, or subsets thereof, or extended sets thereof: operating system 4021 and application program 4022.

[0148] The operating system 4021 includes various system programs, such as the framework layer, core library layer, and driver layer, used to implement various basic business functions and handle hardware-based tasks. The application program 4022 includes various applications, such as a media player and a browser, used to implement various application functions. The program implementing the method of this embodiment can be included in the application program 4022.

[0149] In this embodiment of the invention, by calling the program or instructions stored in the memory 402, specifically the program or instructions stored in the application program 4022, the processor 401 executes the method steps provided in each method embodiment, including, for example:

[0150] Control the system's liquid receiver to perform the refrigerant storage action;

[0151] Once the refrigerant storage action is completed and the system is operating stably, the current energy efficiency change of the system is obtained.

[0152] The system controls the liquid receiver to perform a refrigerant storage action based on the energy efficiency changes, or controls the liquid receiver to perform a refrigerant discharge action based on the energy efficiency changes, so as to maximize the energy efficiency.

[0153] In one possible implementation, the inlet valve and the gas balance valve at the top of the liquid reservoir are opened, and the drain valve at the bottom of the liquid reservoir is closed, so that refrigerant flows into the liquid reservoir through the inlet valve, the gas balance valve is used to discharge the gaseous refrigerant in the liquid reservoir, and the drain valve is used to discharge the liquid refrigerant in the liquid reservoir.

[0154] After a first time interval, the liquid inlet valve and the gas balance valve are closed.

[0155] In one possible implementation, a first energy efficiency is obtained before the refrigerant storage action is performed, and a second energy efficiency is obtained after the system is running stably.

[0156] When the second energy efficiency is greater than the first energy efficiency, the energy efficiency change is determined to be an energy efficiency improvement; when the second energy efficiency is less than or equal to the first energy efficiency, the energy efficiency change is determined to be no energy efficiency improvement.

[0157] In one possible implementation, when the energy efficiency change is that the energy efficiency has not improved, a refrigerant discharge action is performed, which involves controlling the drain valve to open.

[0158] Once the refrigerant discharge operation is completed and the system is operating stably, the step of obtaining the current energy efficiency change of the system is repeated.

[0159] When the energy efficiency change indicates an improvement in energy efficiency, the refrigerant discharge action is repeated until the energy efficiency change indicates no improvement in energy efficiency. Then, the refrigerant storage action is performed once and the control ends.

[0160] In one possible implementation, when the energy efficiency change is an improvement in energy efficiency, the refrigerant storage action and the step of obtaining the energy efficiency change are repeated.

[0161] Control will continue until the energy efficiency status shows no improvement, at which point a refrigerant discharge action will be performed and then terminated.

[0162] In one possible implementation, when the energy efficiency change after the first execution of the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference, the refrigerant storage action is repeated until the energy efficiency change is no improvement in energy efficiency, then the refrigerant discharge action is executed once and the control ends.

[0163] Alternatively, when the energy efficiency change after performing the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, the control ends.

[0164] In one possible implementation, if the energy efficiency change after the first refrigerant storage action is no improvement, a refrigerant discharge action is performed.

[0165] Once the system is running stably, if the difference between the second energy efficiency and the first energy efficiency is greater than the preset difference, the refrigerant discharge action is repeated until the energy efficiency change is no longer improved. Then, the refrigerant storage action is performed once and the control ends.

[0166] Alternatively, once the system is running stably, if the energy efficiency change after the refrigerant discharge action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, then control is terminated.

[0167] The methods disclosed in the above embodiments of the present invention can be applied to processor 401, or implemented by processor 401. Processor 401 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 401 or by instructions in the form of software. The processor 401 may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present invention can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software units in the decoding processor. The software units may be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 402. Processor 401 reads the information in memory 402 and, in conjunction with its hardware, completes the steps of the above method.

[0168] It is understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described herein, or combinations thereof.

[0169] For software implementation, the techniques described herein can be implemented by units that perform the functions described herein. The software code can be stored in memory and executed by a processor. The memory can be implemented in the processor or external to the processor.

[0170] The computer device provided in this embodiment may be as follows: Figure 14 The computer device shown can perform, for example Figure 6 All steps of the control method for multi-split air conditioning systems, thereby achieving Figure 6 For details on the technical effects of the multi-unit system control method shown, please refer to [link / reference]. Figure 6 The relevant descriptions are presented concisely and will not be elaborated upon here.

[0171] This invention also provides a storage medium (computer-readable storage medium). This storage medium stores one or more programs. The storage medium may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as read-only memory, flash memory, hard disk, or solid-state drive; the memory may also include combinations of the above types of memory.

[0172] When one or more programs in the storage medium can be executed by one or more processors to implement the above-described multi-unit system control method executed on the device side.

[0173] The processor is used to execute the multi-unit system control program stored in the memory to implement the following steps of the multi-unit system control method executed on the device side:

[0174] Control the system's liquid receiver to perform the refrigerant storage action;

[0175] Once the refrigerant storage action is completed and the system is operating stably, the current energy efficiency change of the system is obtained.

[0176] The system controls the liquid receiver to perform a refrigerant storage action based on the energy efficiency changes, or controls the liquid receiver to perform a refrigerant discharge action based on the energy efficiency changes, so as to maximize the energy efficiency.

[0177] In one possible implementation, the inlet valve and the gas balance valve at the top of the liquid reservoir are opened, and the drain valve at the bottom of the liquid reservoir is closed, so that refrigerant flows into the liquid reservoir through the inlet valve, the gas balance valve is used to discharge the gaseous refrigerant in the liquid reservoir, and the drain valve is used to discharge the liquid refrigerant in the liquid reservoir.

[0178] After a first time interval, the liquid inlet valve and the gas balance valve are closed.

[0179] In one possible implementation, a first energy efficiency is obtained before the refrigerant storage action is performed, and a second energy efficiency is obtained after the system is running stably.

[0180] When the second energy efficiency is greater than the first energy efficiency, the energy efficiency change is determined to be an energy efficiency improvement; when the second energy efficiency is less than or equal to the first energy efficiency, the energy efficiency change is determined to be no energy efficiency improvement.

[0181] In one possible implementation, when the energy efficiency change is that the energy efficiency has not improved, a refrigerant discharge action is performed, which involves controlling the drain valve to open.

[0182] Once the refrigerant discharge operation is completed and the system is operating stably, the step of obtaining the current energy efficiency change of the system is repeated.

[0183] When the energy efficiency change indicates an improvement in energy efficiency, the refrigerant discharge action is repeated until the energy efficiency change indicates no improvement in energy efficiency. Then, the refrigerant storage action is performed once and the control ends.

[0184] In one possible implementation, when the energy efficiency change is an improvement in energy efficiency, the refrigerant storage action and the step of obtaining the energy efficiency change are repeated.

[0185] Control will continue until the energy efficiency status shows no improvement, at which point a refrigerant discharge action will be performed and then terminated.

[0186] In one possible implementation, when the energy efficiency change after the first execution of the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference, the refrigerant storage action is repeated until the energy efficiency change is no improvement in energy efficiency, then the refrigerant discharge action is executed once and the control ends.

[0187] Alternatively, when the energy efficiency change after performing the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, the control ends.

[0188] In one possible implementation, if the energy efficiency change after the first refrigerant storage action is no improvement, a refrigerant discharge action is performed.

[0189] Once the system is running stably, if the difference between the second energy efficiency and the first energy efficiency is greater than the preset difference, the refrigerant discharge action is repeated until the energy efficiency change is no longer improved. Then, the refrigerant storage action is performed once and the control ends.

[0190] Alternatively, once the system is running stably, if the energy efficiency change after the refrigerant discharge action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, then control is terminated.

[0191] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0192] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0193] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control method for a multi-unit air conditioning system, characterized in that, include: Control the system's liquid receiver to perform the refrigerant storage action; Once the refrigerant storage action is completed and the system is operating stably, the current energy efficiency change of the system is obtained. The system can control the liquid receiver to perform a refrigerant storage action based on the energy efficiency changes, or control the liquid receiver to perform a refrigerant discharge action based on the energy efficiency changes, so as to maximize the energy efficiency. The method further includes: obtaining a first energy efficiency before performing the refrigerant storage action, and obtaining a second energy efficiency after the system has stabilized; When the energy efficiency change after the first refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference, the refrigerant storage action is repeated until the energy efficiency change is no improvement in energy efficiency. Then, a refrigerant discharge action is performed to restore the refrigerant state to the state before the last refrigerant storage action, and the control ends. Alternatively, when the energy efficiency change after performing the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, the control ends.

2. The method according to claim 1, characterized in that, The control of the system's liquid receiver to perform the refrigerant storage action includes: The liquid inlet valve and the gas balance valve at the top of the liquid receiver are opened, and the liquid drain valve at the bottom of the liquid receiver is closed, so that the refrigerant flows into the liquid receiver through the liquid inlet valve. The gas balance valve is used to discharge the gaseous refrigerant in the liquid receiver, and the liquid drain valve is used to discharge the liquid refrigerant in the liquid receiver. After a first time interval, the liquid inlet valve and the gas balance valve are closed.

3. The method according to claim 2, characterized in that, The step of obtaining the current energy efficiency change of the system includes: When the second energy efficiency is greater than the first energy efficiency, the energy efficiency change is determined to be an energy efficiency improvement; when the second energy efficiency is less than or equal to the first energy efficiency, the energy efficiency change is determined to be no energy efficiency improvement.

4. The method according to claim 3, characterized in that, The step of controlling the liquid receiver to perform a refrigerant discharge action based on the energy efficiency change includes: When the energy efficiency change is that the energy efficiency has not improved, a refrigerant discharge action is performed, which involves controlling the drain valve to open. Once the refrigerant discharge operation is completed and the system is operating stably, the step of obtaining the current energy efficiency change of the system is repeated. When the energy efficiency change indicates an improvement in energy efficiency, the refrigerant discharge action is repeated until the energy efficiency change indicates no improvement in energy efficiency. Then, the refrigerant storage action is performed once and the control ends.

5. The method according to claim 3, characterized in that, The step of controlling the liquid receiver to perform refrigerant storage based on the energy efficiency change includes: When the energy efficiency change is an improvement in energy efficiency, the refrigerant storage action and the step of obtaining the energy efficiency change are repeated. Control will continue until the energy efficiency status shows no improvement, at which point a refrigerant discharge action will be performed and then terminated.

6. The method according to claim 3, characterized in that, The method further includes: If the energy efficiency does not improve after the first refrigerant storage action, then perform a refrigerant discharge action. Once the system is running stably, if the difference between the second energy efficiency and the first energy efficiency is greater than the preset difference, the refrigerant discharge action is repeated until the energy efficiency change is no longer improved. Then, the refrigerant storage action is performed once and the control ends. Alternatively, once the system is running stably, if the energy efficiency change after the refrigerant discharge action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, then control is terminated.

7. A multi-split air conditioning system, characterized in that, To implement the method of claim 1, the method comprises: Storage tank, inlet valve, gas balance valve, and drain valve; One end of the top of the liquid storage tank is connected to one end of the liquid inlet valve, the other end of the top of the liquid storage tank is connected to one end of the gas balance valve, and one end of the bottom of the liquid storage tank is connected to one end of the liquid outlet valve. The other end of the inlet valve is connected to the liquid-side main pipe on the medium-pressure side. The inlet valve is used to allow refrigerant to flow into the reservoir when the refrigerant storage is activated. The other end of the gas balance valve and the other end of the drain valve are connected to the pipeline on the low-pressure side. The gas balance valve is used to discharge the gaseous refrigerant in the liquid receiver when the refrigerant storage is activated, and the liquid drain valve is used to discharge the liquid refrigerant in the liquid receiver when the refrigerant discharge is activated. The storage tank is connected to the liquid-side main pipe via an inlet valve and to a third pipeline via an air balance valve and a drain valve; The inlet valve and related pipelines are connected to the top of the storage tank, the gas balance valve and related pipelines are connected to the top of the storage tank, and the drain valve and related pipelines are connected to the bottom of the storage tank.

8. A control device for a multi-unit air conditioning system, characterized in that, include: The control module is used to control the liquid receiver of the system to perform the refrigerant storage action; The acquisition module is used to acquire the current energy efficiency change of the system after the refrigerant storage action is completed and the system is running stably. The control module is also used to control the liquid receiver to perform a refrigerant storage action according to the energy efficiency change, or to control the liquid receiver to perform a refrigerant discharge action according to the energy efficiency change, so as to maximize the energy efficiency; The acquisition module is specifically used to acquire the first energy efficiency before the refrigerant storage action is performed, and to acquire the second energy efficiency after the system is running stably. The control module is also used to repeat the refrigerant storage action when the energy efficiency change after the first refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is greater than a preset difference, until the energy efficiency change is no improvement in energy efficiency, then perform a refrigerant discharge action to restore the refrigerant state to the state before the last refrigerant storage action, and end the control. Alternatively, when the energy efficiency change after performing the refrigerant storage action is an improvement in energy efficiency, and the difference between the second energy efficiency and the first energy efficiency is less than or equal to a preset difference, the control ends.

9. A computer device, characterized in that, include: A processor and a memory, the processor being configured to execute a multi-unit system control program stored in the memory to implement the multi-unit system control method according to any one of claims 1 to 6.

10. A storage medium, characterized in that, The storage medium stores one or more programs, which can be executed by one or more processors to implement the multi-unit system control method according to any one of claims 1 to 6.

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