Multi-connected air conditioner control method and device, electronic equipment and readable storage medium

Abstract

The application relates to a multi-connected air conditioner control method and device, electronic equipment and a readable storage medium. The method comprises the following steps: when the air conditioner running mode is a heating mode, determining a shutdown indoor unit with a shutdown running state in the indoor unit, and controlling the shutdown indoor unit to be disconnected with a refrigerant pipeline; determining a terminal indoor unit in the shutdown indoor unit; and performing a refrigerant recovery operation on the pipeline corresponding to the terminal indoor unit. By disconnecting the shutdown indoor unit with the refrigerant pipeline, the refrigerant can be prevented from entering the indoor unit to cause heat loss; meanwhile, by recovering the refrigerant in the terminal indoor unit, the refrigerant can be prevented from accumulating in the refrigerant pipeline, and the refrigerant recovery in the terminal indoor unit can drive the refrigerant in the refrigerant pipeline of the non-terminal indoor unit to circulate to a certain extent, so that the refrigerant recovery is ensured, and excessive heat loss of the system caused by the refrigerant recovery of too many indoor units is avoided.

Description

Technical Field

[0001] This application relates to the field of air conditioning equipment, and more particularly to a multi-split air conditioning control method, device, electronic equipment, and readable storage medium. Background Technology

[0002] When a multi-split air conditioner is in heating mode, the accumulation of refrigerant in the indoor unit with longer piping will reduce the heating capacity of the air conditioning unit. To solve this problem, refrigerant can be recovered from the piping of the shut-down indoor unit so that the refrigerant in the piping can be circulated back to the outdoor unit. However, if too much refrigerant is recovered from the piping, it will cause excessive heat loss. Summary of the Invention

[0003] This application provides a multi-split air conditioning control method, device, electronic equipment, and readable storage medium, aiming to solve the technical problem of excessive heat loss caused by refrigerant recovery in the piping of the shut-down indoor unit in the prior art.

[0004] To solve the above-mentioned technical problems, or at least partially solve them, this application provides a multi-split air conditioning control method, the method comprising the following steps:

[0005] When the air conditioner is in heating mode, the indoor unit in the indoor unit is identified as being turned off, and the indoor unit is disconnected from the refrigerant pipe.

[0006] Identify the terminal indoor unit among the indoor units that are shut down;

[0007] Refrigerant recovery is performed on the pipes corresponding to the terminal indoor unit.

[0008] Optionally, the step of determining the terminal indoor unit among the shut-down indoor units includes:

[0009] Obtain the piping length between each of the shut-down indoor and outdoor units;

[0010] Among the indoor units that are turned off, the first indoor unit whose piping length is greater than a first threshold is identified;

[0011] Determine whether the number of the first indoor unit is 1;

[0012] If the number of the first indoor units is 1, then the first indoor unit is used as the terminal indoor unit.

[0013] Optionally, after the step of determining whether the number of the first indoor units is 1, the following is included:

[0014] If the number of the first indoor units is greater than 1, then determine the common piping length among the first indoor units;

[0015] In the first indoor unit, a first set of units with a common piping length greater than a second threshold is identified;

[0016] For each of the first sets, the indoor unit with the longest piping length in the first set is designated as the second indoor unit, and the other indoor units in the first set besides the second indoor unit are designated as the third indoor unit.

[0017] The other indoor units in the first indoor unit group, excluding the third indoor unit, are designated as the terminal indoor units.

[0018] Optionally, the step of using the other indoor units in the first indoor unit, excluding the second indoor unit, as the terminal indoor unit includes:

[0019] In the first indoor unit, a second set is determined whose common piping length is less than a third threshold, wherein the third threshold is less than the second threshold, and the indoor units in the second set are the fourth indoor units;

[0020] Among the second indoor unit and the fourth indoor unit, a fifth indoor unit is determined whose common piping length is within the range formed by the second threshold and the third threshold.

[0021] In the fifth indoor unit, select an indoor unit in sequence as the terminal indoor unit.

[0022] Optionally, after the step of determining the second set in the first indoor unit where the common piping length is less than the third threshold, the method further includes:

[0023] A sixth indoor unit is identified among the second and fourth indoor units whose common piping length is less than the third threshold.

[0024] In the first indoor unit, a third set is determined where the common piping length is within the interval formed by the second threshold and the third threshold, wherein the indoor unit in the third set is the seventh indoor unit;

[0025] Among the sixth and seventh indoor units, an eighth indoor unit is determined whose common piping length falls within the range formed by the second and third thresholds;

[0026] In the eighth indoor unit, select an indoor unit in sequence as the terminal indoor unit, and select the sixth indoor unit and the other indoor units in the seventh indoor unit except for the eighth indoor unit as the terminal indoor unit.

[0027] Optionally, the step of performing refrigerant recovery on the pipes corresponding to the terminal indoor unit includes:

[0028] Determine the recycling time corresponding to the terminal indoor unit;

[0029] The gas pipe and liquid pipe corresponding to the terminal indoor unit are connected at preset intervals, wherein the duration of each connection between the gas pipe and the liquid pipe is the recycling duration.

[0030] Optionally, the step of determining the recycling time corresponding to the terminal indoor unit includes:

[0031] Obtain the operating parameters corresponding to the terminal indoor unit;

[0032] Determine the duration correction value based on the aforementioned operating parameters;

[0033] Obtain a preset base duration, and use the sum of the preset base duration and the duration correction value as the recycling duration.

[0034] To achieve the above objectives, the present invention also provides a multi-split air conditioning control device, the multi-split air conditioning control device comprising:

[0035] The first control module is used to determine the shut-off indoor unit in the indoor unit when the air conditioner is in heating mode, and to control the shut-off indoor unit to disconnect from the refrigerant pipe.

[0036] The first determining module is used to determine the terminal indoor unit among the shut-down indoor units;

[0037] The first execution module is used to perform refrigerant recovery operations on the pipes corresponding to the terminal indoor unit.

[0038] To achieve the above objectives, the present invention also provides an electronic device, the electronic device including a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the multi-split air conditioning control method as described above.

[0039] To achieve the above objectives, the present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the multi-split air conditioning control method described above.

[0040] This invention proposes a multi-split air conditioner control method, device, electronic equipment, and readable storage medium. When the air conditioner is in heating mode, it identifies the indoor unit that is turned off and disconnects it from the refrigerant piping. It then identifies the terminal indoor unit among the turned-off units and performs refrigerant recovery on the piping corresponding to that terminal indoor unit. By disconnecting the turned-off indoor unit from the refrigerant piping, refrigerant is prevented from entering the indoor unit and causing heat loss. Simultaneously, refrigerant recovery on the terminal indoor unit prevents refrigerant accumulation in the piping. Furthermore, refrigerant recovery on the terminal indoor unit can, to some extent, circulate the refrigerant in the piping of non-terminal indoor units, thus ensuring refrigerant recovery while avoiding excessive system heat loss caused by refrigerant recovery from too many indoor units. Attached Figure Description

[0041] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0043] Figure 1 This is a modular structure diagram of the multi-split air conditioning control device of the present invention;

[0044] Figure 2 This is a structural diagram of the multi-split air conditioning control device of the present invention;

[0045] Figure 3 This is a flowchart of an embodiment of the multi-split air conditioning control method of the present invention;

[0046] Figure 4 This is a detailed flowchart of the process for determining the terminal indoor unit in the multi-split air conditioning control method of the present invention;

[0047] Figure 5 This is a schematic diagram of the module structure of the electronic device of the present invention. Detailed Implementation

[0048] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0049] This invention provides a multi-split air conditioner control method, applied to a multi-split air conditioner control device. First, see... Figure 1 , Figure 1 This is a modular structure diagram of the multi-split air conditioning control device of the present invention; the multi-split air conditioning control device includes multiple air conditioning adjustment modules 100, multiple indoor units 200, and an outdoor unit 300; the air conditioning adjustment modules 100 are respectively connected to the indoor units 200 and the outdoor units 300; each air conditioning adjustment module 100 includes a main circuit unit 110 and a circulation unit 120, the main circuit unit 110 is connected between the indoor units 200 and the outdoor units 300, and the circulation unit 120 is connected between the liquid pipe and the gas pipe of the outdoor unit 300; wherein:

[0050] The main circuit unit 110 is used to disconnect the connection between the indoor unit 200 and the outdoor unit 300 when the indoor unit 200 stops in heating mode.

[0051] The circulation unit 120 is used for refrigerant recovery.

[0052] The specific structures of the air conditioning control module 100, indoor unit 200, and outdoor unit 300 can be configured according to actual needs, as shown in [reference needed]. Figure 2 The outdoor unit 300 includes a compressor 310, a four-way valve 320, a first heat exchanger T1, a second throttling component S2, and a gas-liquid separator 330. The exhaust port of the compressor 310 is connected to the first port of the four-way valve 320, the second port of the four-way valve 320 is connected to the gas pipe, the third port of the four-way valve 320 is connected to the air inlet of the compressor 310 through the gas-liquid separator 330, and the fourth port of the four-way valve 320 is connected to the liquid pipe through the first heat exchanger T1 and the second throttling component S2 in sequence.

[0053] The indoor unit 200 includes a second heat exchanger (not shown), and the two ports of the second heat exchanger are connected to the gas pipe and the liquid pipe respectively through the main circuit unit 110.

[0054] See Figure 2In heating mode, the first heat exchanger T1 acts as an evaporator and the second heat exchanger acts as a condenser; the refrigerant output from the exhaust port of the compressor 310 enters the gas pipe through the four-way valve 320.

[0055] At this time, if the indoor unit 200 is turned on, the main circuit unit 110 connects the indoor unit 200 and the outdoor unit 300. The refrigerant in the gas pipe enters the second heat exchanger for heat exchange and is then transferred to the liquid pipe through the main circuit unit 110. The refrigerant in the liquid pipe enters the first heat exchanger T1 through the second throttling component S2 for heat exchange and then enters the gas-liquid separator 330 through the four-way valve 320. The gas-liquid separator 330 outputs refrigerant to the air inlet of the compressor 310.

[0056] If the indoor unit 200 stops, the main circuit unit 110 disconnects the connection between the indoor unit 200 and the outdoor unit 300. The refrigerant in the gas pipe will not enter the stopped indoor unit 200, thus preventing heat loss to the system. At the same time, the circulation unit 120 performs refrigerant recovery by connecting the gas and liquid pipes of the branch circuits, allowing the gas and liquid pipes of the branch circuits to enter the main circuit circulation, thereby preventing refrigerant accumulation. A branch circuit refers to a refrigerant pipe without branches, while a main circuit refers to a refrigerant pipe with branches.

[0057] See you again Figure 2 The main circuit unit 110 includes a first control valve C1 and a second control valve C2; ​​wherein:

[0058] The first control valve C1 is connected between the gas pipe of the indoor unit 200 and the gas pipe of the outdoor unit 300, and the second control valve C2 is connected between the liquid pipe of the indoor unit 200 and the liquid pipe of the outdoor unit 300.

[0059] When the first control valve C1 is opened, refrigerant can be transferred between the gas pipe of the indoor unit 200 and the gas pipe of the outdoor unit 300. When the second control valve C2 is opened, refrigerant can be transferred between the liquid pipe of the indoor unit 200 and the liquid pipe of the outdoor unit 300.

[0060] If the indoor unit 200 is turned on, the first control valve C1 and the second control valve C2 are opened; if the indoor unit 200 is turned off, the first control valve C1 and the second control valve C2 are closed.

[0061] Furthermore, the circulation unit 120 includes a first throttling component S1; wherein:

[0062] The first throttling component S1 is connected between the liquid pipe and the gas pipe of the outdoor unit 300.

[0063] When the outdoor unit 300 and the indoor unit 200 are disconnected by the main circuit unit 110, the liquid pipe and gas pipe in the outdoor unit 300 corresponding to the indoor unit 200 lose the circulation channel of the indoor unit 200. At this time, the refrigerant in the gas pipe is cut off in the main circuit unit 110, and there is no refrigerant output in the liquid pipe. However, by opening the gas pipe and the liquid pipe through the first throttling device S1, the circulation of the gas pipe and the liquid pipe can be realized. The refrigerant in the gas pipe enters the liquid pipe through the first throttling device S1 and is then output to the outdoor unit 300, avoiding the accumulation of refrigerant in the gas pipe and realizing refrigerant recovery. The specific opening degree of the first throttling device S1 can be set according to actual needs.

[0064] Furthermore, the main road unit 110 also includes a first unloading valve (not shown) and a second unloading valve (not shown); wherein:

[0065] The first unloading valve is connected between the gas pipe of the indoor unit 200 and the gas pipe of the outdoor unit 300, and the second unloading valve is connected between the liquid pipe of the indoor unit 200 and the liquid pipe of the outdoor unit 300.

[0066] The first and second unloading valves are used to prevent excessive refrigerant pressure from causing pipe bursts. The pressure thresholds of the first and second unloading valves can be set based on the actual application scenario. When the gas pipe pressure is less than the pressure threshold of the first unloading valve, the first unloading valve is closed; when the gas pipe pressure is greater than or equal to the pressure threshold of the first unloading valve, the first unloading valve is open. Similarly, when the liquid pipe pressure is less than the pressure threshold of the second unloading valve, the second unloading valve is closed; when the liquid pipe pressure is greater than or equal to the pressure threshold of the second unloading valve, the second unloading valve is open.

[0067] The following describes the states of different components in the air conditioning control module 100 under different conditions during heating mode:

[0068] When the indoor unit is turned on, the first control valve C1 and the second control valve C2 are opened, and the first throttling component S1 is closed.

[0069] When the indoor unit is turned off and refrigerant is recovered, the first control valve C1 and the second control valve C2 are closed, and the first throttling component S1 is opened.

[0070] When the indoor unit is turned off and refrigerant recovery is not performed, the first control valve C1 and the second control valve C2 are closed, and the first throttling component S1 is closed.

[0071] Reference Figure 3 , Figure 3 This is a flowchart illustrating the first embodiment of the multi-split air conditioning control method of the present invention. The method includes the following steps:

[0072] Step S10: When the air conditioner is in heating mode, identify the indoor unit that is in shutdown mode and disconnect it from the refrigerant pipe.

[0073] In heating mode, if the indoor unit stops, in order to prevent heat loss caused by refrigerant passing through the shut-off indoor unit, disconnect the shut-off indoor unit from the refrigerant pipe.

[0074] Step S20: Determine the terminal indoor unit among the shut-down indoor units;

[0075] Step S30: Perform refrigerant recovery operation on the pipes corresponding to the terminal indoor unit.

[0076] The terminal indoor unit is the indoor unit that requires refrigerant recovery; the determination conditions of the terminal indoor unit can be set based on actual application needs.

[0077] In heating mode, for the upstream terminal indoor unit, a portion of the refrigerant in the main pipeline is diverted through the branch pipeline to the indoor unit for heat exchange, while the remainder flows into the downstream pipeline. For the downstream indoor unit, the refrigerant flowing into the downstream indoor unit from the main pipeline is the remaining refrigerant after the upstream diversion, meaning there is no need for downstream diversion after passing through the downstream indoor unit. The indoor unit connected to the end of the refrigerant pipeline main line is the downstream indoor unit, and all indoor units other than the downstream indoor unit are the upstream indoor units.

[0078] When an upstream indoor unit stops, if the corresponding gas and liquid pipes are connected, some refrigerant in the main gas pipe will be diverted directly into the liquid pipe, resulting in a reduction in the amount of refrigerant downstream and affecting the heat exchange effect of the downstream indoor unit. Therefore, to avoid this situation, the corresponding gas and liquid pipes are not connected when the upstream indoor unit stops. It is understandable that when the upstream indoor unit stops, the refrigerant in the gas pipe will still flow downstream. Therefore, even without refrigerant recovery, the problem of refrigerant accumulation can be improved.

[0079] When the downstream indoor unit stops, there is no downstream diversion, so there is a problem of refrigerant accumulation. It is necessary to connect the corresponding gas pipe and liquid pipe to perform refrigerant recovery, without affecting the heat exchange efficiency of other indoor units.

[0080] In addition, for the indoor unit located upstream, if the length of its corresponding branch pipe is too long, the refrigerant in the branch pipe will not flow downstream, and a large amount of refrigerant will accumulate in the excessively long branch pipe. Therefore, it is necessary to recover the refrigerant from the upstream indoor unit.

[0081] This embodiment disconnects the indoor unit from the refrigerant piping when it is turned off, thus preventing refrigerant from entering the indoor unit and causing heat loss. At the same time, refrigerant recovery from the terminal indoor units prevents refrigerant from accumulating in the refrigerant piping. Refrigerant recovery from the terminal indoor units can also drive the refrigerant in the refrigerant piping of non-terminal indoor units to circulate to a certain extent. Therefore, while ensuring refrigerant recovery, it avoids excessive heat loss in the system caused by refrigerant recovery from too many indoor units.

[0082] Further details will follow. Figure 4 In the second embodiment of the multi-split air conditioning control method of the present invention based on the first embodiment, step S20 includes the following steps:

[0083] Step S21: Obtain the piping length between each of the shut-off indoor units and outdoor units;

[0084] Step S22: Determine the first indoor unit among the shut-down indoor units whose piping length is greater than the first threshold.

[0085] Step S23: Determine whether the number of the first indoor units is 1;

[0086] Step S24: If the number of the first indoor units is 1, then the first indoor unit is used as the terminal indoor unit.

[0087] Piping length refers to the length of the refrigerant passage between the indoor and outdoor units. When the piping length corresponding to the indoor unit that is turned off is small, i.e., the piping length is less than or equal to the first threshold, less refrigerant can be stored in the branch corresponding to the indoor unit that is turned off. Therefore, even if refrigerant recovery is not performed, it will not have a significant impact on the heating capacity. The piping length can be recorded and stored during the installation of the indoor and outdoor units. The specific value of the first threshold can be set based on the actual application scenario.

[0088] When the piping length is large, that is, when the piping length is greater than the first threshold, the branch corresponding to the shut-off indoor unit is more likely to accumulate a lot of refrigerant. Therefore, it is necessary to identify the indoor unit that needs to be shut down and whose piping length is greater than the first threshold, that is, the indoor unit that needs to be refrigerant recovered.

[0089] When the number of first indoor units is 0, it means that there are no indoor units that are turned off, or that no refrigerant recovery is required for the indoor units that are turned off. In this case, there are no terminal indoor units, and the refrigerant recovery operation is not performed.

[0090] When the number of first indoor units is 1, it means that only one indoor unit needs to be refrigerant recovered. In this case, the first indoor unit is used as the terminal indoor unit, and the number of terminal indoor units is 1. There is no problem of excessive refrigerant recovery causing heat loss and waste.

[0091] When there are multiple first indoor units, they may interfere with each other during refrigerant recovery. Therefore, it is necessary to further determine the specific terminal indoor units within the first indoor units. Specifically:

[0092] Step S25: If the number of the first indoor units is greater than 1, then determine the common piping length between the first indoor units;

[0093] Step S26: In the first indoor unit, determine the first set whose common piping length is greater than the second threshold;

[0094] Step S27: For each of the first sets, the indoor unit with the longest piping length in the first set is designated as the second indoor unit, and the other indoor units in the first set besides the second indoor unit are designated as the third indoor unit.

[0095] Step S28: Select the other indoor units in the first indoor unit, excluding the third indoor unit, as the terminal indoor units.

[0096] The common piping length is the length of the common refrigerant passage between multiple indoor units. For example, if the main line is set with separate pipe branches at 1m, 2m, and 3m from the outdoor unit, the pipe branch at 1m connects to the branch corresponding to indoor unit A, the pipe branch at 2m connects to the branch corresponding to indoor unit B, and the pipe branch at 3m connects to the branch corresponding to indoor unit C; then the common piping length between indoor unit A and indoor unit B is 1m, the common piping length between indoor unit A and indoor unit C is 1m, the common piping length between indoor unit B and indoor unit C is 2m, and the common piping length between indoor units A, B, and C is 1m.

[0097] The second threshold is used to indicate the length of the longer common piping; the specific value of the second threshold can be set based on the actual application scenario; the second threshold is less than the first threshold.

[0098] When the common piping length of multiple first indoor units exceeds the second threshold, it indicates that the branch lengths corresponding to these first indoor units, i.e., the indoor units in the first set, are all relatively short. In this case, refrigerant recovery only needs to be performed on one of the first indoor units to meet the refrigerant recovery needs of all indoor units in the first set. Since the first indoor unit with the longest piping can achieve the greatest recovery effect when performing refrigerant recovery, the first indoor unit with the longest piping, i.e., the second indoor unit, is designated as the terminal indoor unit, while the third indoor unit, which belongs to the same first set as the second indoor unit, does not need to perform refrigerant recovery.

[0099] It should be noted that there can be multiple first sets. When there are multiple first sets, the second indoor unit is determined from different first sets, and the second indoor unit corresponds one-to-one with the first set.

[0100] For the first indoor unit whose common piping length is less than the second threshold, it indicates that the corresponding branch length is relatively long, and there is a risk of refrigerant accumulation. Therefore, it needs to be used as a terminal indoor unit to perform refrigerant recovery operation.

[0101] Further, step S28 includes the following steps:

[0102] Step S281: Determine a second set of indoor units in the first indoor unit whose common piping length is less than a third threshold, wherein the third threshold is less than the second threshold, and the indoor units in the second set are the fourth indoor units;

[0103] Step S282: Determine a fifth indoor unit among the second indoor unit and the fourth indoor unit whose common piping length is within the range formed by the second threshold and the third threshold;

[0104] Step S283: Select an indoor unit from the fifth indoor unit as the terminal indoor unit.

[0105] When the common piping length of multiple first indoor units is less than the third threshold, it indicates that the branch lengths corresponding to these first indoor units, i.e., the indoor units in the second set, are all too long. In this case, refrigerant recovery operations need to be performed separately.

[0106] It should be noted that the first indoor unit may have common piping lengths for different indoor units that are both greater than the second threshold and less than the third threshold. Therefore, to avoid repeated judgments for the same indoor unit, after determining the first set, the first indoor unit is excluded from the first set before the third threshold is determined. It can be understood that when the conditions for the second threshold are met, the first indoor unit can already meet the refrigerant recovery requirements; therefore, the second threshold has a higher priority than the third threshold. Similarly, in subsequent judgments within the intervals formed by the second and third thresholds, the first indoor unit is excluded from the first and second sets before the judgment is performed.

[0107] Although the common piping length between the four indoor units is less than the third threshold, the second indoor unit was not considered when determining the third threshold. Therefore, after identifying the fourth indoor unit, the second and fourth indoor units need to be re-evaluated for the third threshold to avoid missed detection.

[0108] If there is a fifth indoor unit among the second and fourth indoor units whose shared piping length falls within the range formed by the second and third thresholds, it indicates that the branch length corresponding to the fifth indoor unit is relatively long. In this case, if all fifth indoor units are used as terminal indoor units for refrigerant recovery, there will still be a problem of excessive heat loss. However, if the fifth indoor units are not used as terminal indoor units, there will be a problem of refrigerant accumulation. In order to solve these two problems at the same time, in this embodiment, the fifth indoor units are used as terminal indoor units in sequence, that is, the fifth indoor units alternately perform refrigerant recovery operations. For example, if the fifth indoor units include indoor units A, B, C, and D, the refrigerant recovery operation is performed through indoor unit A in the first recovery cycle, through indoor unit B in the second recovery cycle, through indoor unit C in the third recovery cycle, through indoor unit D in the fourth recovery cycle, and through indoor unit A again in the fifth recovery cycle.

[0109] The number of fifth indoor units simultaneously performing refrigerant recovery operations can be adjusted based on actual needs. For example, if the number of fifth indoor units simultaneously performing refrigerant recovery operations is 2, refrigerant recovery operations are performed through indoor units A and B in the first recovery cycle, through indoor units C and D in the second recovery cycle, through indoor units A and B in the third recovery cycle, and through indoor units C and D in the fourth recovery cycle. The number of fifth indoor units simultaneously performing refrigerant recovery operations can also be determined based on the total number of fifth indoor units. For example, a first threshold and a second threshold can be set. When the number of fifth indoor units is less than the first threshold, the number of fifth indoor units simultaneously performing refrigerant recovery operations is 1. When the number of fifth indoor units is greater than the first threshold and less than the second threshold, the number of fifth indoor units simultaneously performing refrigerant recovery operations is 2. When the number of fifth indoor units is greater than the second threshold, the number of fifth indoor units simultaneously performing refrigerant recovery operations is 3.

[0110] Further, the following step is included after step S281:

[0111] Step S284: Determine a sixth indoor unit among the second and fourth indoor units whose common piping length is less than the third threshold.

[0112] Step S285: In the first indoor unit, determine the third set of indoor units whose common piping length is within the interval formed by the second threshold and the third threshold, wherein the indoor units in the third set are the seventh indoor unit;

[0113] Step S286: Determine an eighth indoor unit among the sixth and seventh indoor units whose common piping length is within the range formed by the second threshold and the third threshold;

[0114] Step S287: Select an indoor unit from the eighth indoor unit as the terminal indoor unit, and select the sixth indoor unit and the other indoor units from the seventh indoor unit (excluding the eighth indoor unit) as the terminal indoor units.

[0115] Since the second threshold is determined for all first indoor units, the third threshold, which is the pipe length shared by the second indoor unit and the fourth indoor unit excluding the fifth indoor unit, is the sixth indoor unit.

[0116] When making the judgment in step S282, the indoor unit in the third set, namely the seventh indoor unit, was not included as the judgment object. Therefore, after determining the sixth indoor unit, the sixth indoor unit and the seventh indoor unit need to be judged again by the third threshold to avoid missed judgment.

[0117] The selection of the eighth indoor unit is the same as that of the fifth indoor unit mentioned above, and will not be repeated here.

[0118] The common piping length of the sixth and seventh indoor units, excluding the eighth indoor unit, is less than the third threshold. It is believed that the branch length of these indoor units is too long and there is a risk of refrigerant accumulation. Therefore, they are all regarded as terminal indoor units.

[0119] This embodiment can accurately determine the terminal indoor unit.

[0120] Furthermore, in the third embodiment of the multi-split air conditioning control method of the present invention based on the first embodiment of the present invention, step S30 includes the following steps:

[0121] Step S31: Determine the recycling time corresponding to the terminal indoor unit;

[0122] Step S32: Connect the gas pipe and liquid pipe corresponding to the terminal indoor unit at preset time intervals, wherein the duration of each connection between the gas pipe and the liquid pipe is the recovery duration.

[0123] The refrigerant recovery duration indicates the length of time the indoor unit performs refrigerant recovery operations. It's understandable that refrigerant accumulation takes time. If the indoor unit continuously performs refrigerant recovery operations, maximum refrigerant recovery can be achieved, but this also leads to heat loss. Therefore, this embodiment sets a preset duration. Each time the refrigerant recovery operation reaches the preset duration, execution is paused for the preset duration, and then resumed after the pause. This cycle repeats, ensuring effective refrigerant recovery while avoiding heat loss due to prolonged recovery. The specific value of the preset duration can be set based on the actual application scenario.

[0124] Further, step S31 includes the following steps:

[0125] Step S311: Obtain the operating parameters corresponding to the terminal indoor unit;

[0126] Step S312: Determine the duration correction value based on the operating parameters;

[0127] Step S313: Obtain the preset base duration, and use the sum of the preset base duration and the duration correction value as the recycling duration.

[0128] The recycling time needs to be matched with the operating environment of the terminal indoor unit; the operating parameters are used to indicate the characteristics of the operating environment of the terminal indoor unit; the time correction value determined by the operating parameters can reflect the impact of the operating environment on the terminal indoor unit.

[0129] The preset base duration indicates the default refrigerant recovery time, which can be set based on actual application needs.

[0130] The recovery time obtained by adjusting the preset base time with a time correction value can match the refrigerant recovery requirements of the terminal indoor unit.

[0131] Operating parameters can be selected based on actual application needs; for example, in this embodiment, operating parameters include exhaust temperature difference, saturation temperature difference, compressor frequency, and piping grade, with corresponding duration correction values ​​for exhaust temperature difference correction, condensing temperature correction, operating load correction, and piping grade correction, respectively. The recovery duration T is:

[0132]

[0133] Where t0 is the exhaust temperature difference correction value, t1 is the condensing temperature correction value, t2 is the operating load correction value, t3 is the operating load correction value, and t4 is the piping grade correction value.

[0134] Among them, the exhaust temperature difference is characterized by the difference between the ambient temperature value and the compressor exhaust temperature value, and the exhaust temperature difference is positively correlated with the exhaust temperature difference correction value;

[0135] The saturation temperature difference is characterized as the difference between the saturation temperature and the ambient temperature, and the saturation temperature difference is positively correlated with the condensation temperature correction value.

[0136] Compressor frequency is negatively correlated with operating load correction value;

[0137] The piping rating indicates the piping length corresponding to the terminal indoor unit. The higher the piping length, the higher the piping rating. The specific correspondence between piping length and piping rating can be set based on actual needs. The piping rating is negatively correlated with the piping rating correction value.

[0138] It should be noted that, for the case where indoor units are selected sequentially as the terminal indoor units, the terminal indoor units are switched each time the refrigerant recovery operation is re-executed. For example, the fifth indoor unit includes indoor units A, B, C, and D:

[0139] The refrigerant recovery operation is performed by indoor unit A for the duration corresponding to indoor unit A.

[0140] Pause for a preset duration;

[0141] The refrigerant recovery operation is performed by indoor unit B for the duration corresponding to indoor unit B.

[0142] Pause for a preset duration;

[0143] The refrigerant recovery operation is performed by indoor unit C for the duration corresponding to indoor unit C;

[0144] Pause for a preset duration;

[0145] The refrigerant recovery operation is performed by indoor unit D for the duration corresponding to indoor unit D;

[0146] Pause for a preset duration;

[0147] The refrigerant recovery operation is performed by indoor unit A for the duration corresponding to indoor unit A.

[0148] This cycle continues.

[0149] This embodiment can effectively perform refrigerant recovery operations.

[0150] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0151] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0152] This application also provides a multi-split air conditioner control device for implementing the above-described multi-split air conditioner control method, the multi-split air conditioner control device comprising:

[0153] The first control module is used to determine the shut-off indoor unit in the indoor unit when the air conditioner is in heating mode, and to control the shut-off indoor unit to disconnect from the refrigerant pipe.

[0154] The first determining module is used to determine the terminal indoor unit among the shut-down indoor units;

[0155] The first execution module is used to perform refrigerant recovery operations on the pipes corresponding to the terminal indoor unit.

[0156] This multi-split air conditioning control device disconnects the indoor unit from the refrigerant piping when it is turned off, thus preventing refrigerant from entering the indoor unit and causing heat loss. At the same time, by recovering refrigerant from the terminal indoor units, it can prevent refrigerant from accumulating in the refrigerant piping. Refrigerant recovery from the terminal indoor units can also, to some extent, drive the refrigerant circulation in the refrigerant piping of the non-terminal indoor units. Therefore, while ensuring refrigerant recovery, it can also prevent excessive heat loss from the system caused by refrigerant recovery from too many indoor units.

[0157] It should be noted that the first control module in this embodiment can be used to execute step S10 in this application embodiment, the first determination module in this embodiment can be used to execute step S20 in this application embodiment, and the first execution module in this embodiment can be used to execute step S30 in this application embodiment.

[0158] Furthermore, the first determining module includes:

[0159] The first acquisition unit is used to acquire the pipe length between each of the shut-off indoor units and outdoor units;

[0160] The first determining unit is configured to determine, among the shut-down indoor units, the first indoor unit whose piping length is greater than a first threshold.

[0161] The first judgment unit is used to determine whether the number of the first indoor unit is 1;

[0162] The first execution unit is configured to use the first indoor unit as the terminal indoor unit if the number of the first indoor units is 1.

[0163] Furthermore, the first determining module also includes:

[0164] The second determining unit is used to determine the common piping length between the first indoor units if the number of the first indoor units is greater than 1.

[0165] The third determining unit is used to determine a first set in the first indoor unit whose common piping length is greater than a second threshold.

[0166] The second execution unit is used to, for each of the first sets, designate the indoor unit with the longest piping length in the first set as the second indoor unit, and designate the other indoor units in the first set besides the second indoor unit as the third indoor unit;

[0167] The third execution unit is used to use other indoor units in the first indoor unit, excluding the third indoor unit, as the terminal indoor units.

[0168] Furthermore, the third execution unit includes:

[0169] The first determining subunit is used to determine a second set of indoor units in the first indoor unit whose common piping length is less than a third threshold, wherein the third threshold is less than the second threshold, and the indoor units in the second set are the fourth indoor units;

[0170] The second determining subunit is used to determine, among the second indoor unit and the fourth indoor unit, a fifth indoor unit whose common piping length is within the range formed by the second threshold and the third threshold;

[0171] The first selection subunit is used to sequentially select an indoor unit from the fifth indoor unit as the terminal indoor unit.

[0172] Furthermore, the third execution unit also includes:

[0173] The third determining subunit is used to determine, among the second indoor unit and the fourth indoor unit, a sixth indoor unit whose common piping length is less than the third threshold.

[0174] The fourth determining subunit is used to determine, in the first indoor unit, a third set of indoor units whose common piping length is within the interval formed by the second threshold and the third threshold, wherein the indoor units in the third set are the seventh indoor unit;

[0175] The fifth determining subunit is used to determine, among the sixth indoor unit and the seventh indoor unit, the eighth indoor unit whose common piping length is within the range formed by the second threshold and the third threshold;

[0176] The second selection subunit is used to sequentially select an indoor unit from the eighth indoor unit as the terminal indoor unit, and to select the sixth indoor unit and the other indoor units from the seventh indoor unit besides the eighth indoor unit as the terminal indoor units.

[0177] Furthermore, the first execution module includes:

[0178] The fourth determining unit determines the recycling time corresponding to the terminal indoor unit;

[0179] The fourth execution unit is used to connect the gas pipe and liquid pipe corresponding to the terminal indoor unit at preset time intervals, wherein the duration of each connection between the gas pipe and the liquid pipe is the recovery duration.

[0180] Furthermore, the fourth determining unit includes:

[0181] The first acquisition subunit is used to acquire the operating parameters corresponding to the terminal indoor unit;

[0182] The sixth determining subunit is used to determine the duration correction value based on the operating parameters;

[0183] The second acquisition subunit is used to acquire a preset base duration and use the sum of the preset base duration and the duration correction value as the recycling duration.

[0184] It should be noted that the examples and application scenarios implemented by the above modules and corresponding steps are the same, but are not limited to the content disclosed in the above embodiments. It should also be noted that the above modules, as part of the device, can be implemented in software or hardware, wherein the hardware environment includes a network environment.

[0185] Reference Figure 5 In terms of hardware structure, the electronic device may include components such as a communication module 10, a memory 20, and a processor 30. In the electronic device, the processor 30 is connected to both the memory 20 and the communication module 10. The memory 20 stores a computer program, which is executed by the processor 30. When the computer program is executed, it implements the steps of the above-described method embodiments.

[0186] The communication module 10 can connect to external communication devices via a network. The communication module 10 can receive requests from the external communication devices and can also send requests, instructions, and information to the external communication devices. The external communication devices can be other electronic devices, servers, or IoT devices, such as televisions, etc.

[0187] The memory 20 can be used to store software programs and various data. The memory 20 may primarily include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function (such as determining the operating state of an indoor unit as off in an indoor unit), etc.; the data storage area may include a database, and may store data or information created based on system usage. Furthermore, the memory 20 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0188] The processor 30 is the control center of the electronic device. It connects various parts of the electronic device via various interfaces and lines. By running or executing software programs and / or modules stored in the memory 20, and by calling data stored in the memory 20, it performs various functions and processes data, thereby providing overall monitoring of the electronic device. The processor 30 may include one or more processing units; optionally, the processor 30 may integrate an application processor and a modem processor. The application processor mainly handles the operating system, user interface, and applications, while the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into the processor 30.

[0189] although Figure 5 Not shown, but the above-described electronic device may further include a circuit control module for connecting to a power supply to ensure the normal operation of other components. Those skilled in the art will understand that... Figure 5 The electronic device structure shown does not constitute a limitation on the electronic device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0190] The present invention also proposes a computer-readable storage medium having a computer program stored thereon. The computer-readable storage medium may be... Figure 5 The memory 20 in the electronic device may also be at least one of ROM (Read-Only Memory) / RAM (Random Access Memory), magnetic disk, optical disk, etc. The computer-readable storage medium includes a number of instructions to cause a terminal device with a processor (which may be a television, automobile, mobile phone, computer, server, terminal, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0191] In this invention, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0192] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0193] Although embodiments of the present invention have been shown and described above, the scope of protection of the present invention is not limited thereto. It is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, and substitutions to the above embodiments within the scope of the present invention, and such changes, modifications, and substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for controlling a multi-split air conditioning system, characterized in that, The multi-split air conditioning control method includes: When the air conditioner is in heating mode, the indoor unit in the indoor unit is identified as being turned off, and the indoor unit is disconnected from the refrigerant pipe. Identify the terminal indoor unit among the indoor units that are shut down; Perform refrigerant recovery operation on the pipes corresponding to the terminal indoor unit; The step of determining the terminal indoor unit in the shut-down indoor unit includes: Obtain the piping length between each of the shut-down indoor and outdoor units; Among the indoor units that are turned off, the first indoor unit whose piping length is greater than a first threshold is identified; Determine whether the number of the first indoor unit is 1; If the number of the first indoor units is 1, then the first indoor unit is used as the terminal indoor unit.

2. The multi-split air conditioning control method as described in claim 1, characterized in that, Following the step of determining whether the number of the first indoor units is 1, the following is included: If the number of the first indoor units is greater than 1, then determine the common piping length among the first indoor units; In the first indoor unit, a first set of units with a common piping length greater than a second threshold is identified; For each of the first sets, the indoor unit with the longest piping length in the first set is designated as the second indoor unit, and the other indoor units in the first set besides the second indoor unit are designated as the third indoor unit. The other indoor units in the first indoor unit group, excluding the third indoor unit, are designated as the terminal indoor units.

3. The multi-split air conditioning control method as described in claim 2, characterized in that, The step of using the other indoor units in the first indoor unit, excluding the second indoor unit, as the terminal indoor unit includes: In the first indoor unit, a second set is determined whose common piping length is less than a third threshold, wherein the third threshold is less than the second threshold, and the indoor units in the second set are the fourth indoor units; Among the second indoor unit and the fourth indoor unit, a fifth indoor unit is determined whose common piping length is within the range formed by the second threshold and the third threshold. In the fifth indoor unit, select an indoor unit in sequence as the terminal indoor unit.

4. The multi-split air conditioning control method as described in claim 3, characterized in that, Following the step of determining the second set of units in the first indoor unit whose common piping length is less than the third threshold, the method further includes: A sixth indoor unit is identified among the second and fourth indoor units whose common piping length is less than the third threshold. In the first indoor unit, a third set is determined where the common piping length is within the interval formed by the second threshold and the third threshold, wherein the indoor unit in the third set is the seventh indoor unit; Among the sixth and seventh indoor units, an eighth indoor unit is determined whose common piping length falls within the range formed by the second and third thresholds; In the eighth indoor unit, select an indoor unit in sequence as the terminal indoor unit, and select the sixth indoor unit and the other indoor units in the seventh indoor unit except for the eighth indoor unit as the terminal indoor unit.

5. The multi-split air conditioning control method as described in claim 1, characterized in that, The steps for performing refrigerant recovery on the pipes corresponding to the terminal indoor unit include: Determine the recycling time corresponding to the terminal indoor unit; The gas pipe and liquid pipe corresponding to the terminal indoor unit are connected at preset intervals, wherein the duration of each connection between the gas pipe and the liquid pipe is the recycling duration.

6. The multi-split air conditioning control method as described in claim 5, characterized in that, The step of determining the recycling time corresponding to the terminal indoor unit includes: Obtain the operating parameters corresponding to the terminal indoor unit; Determine the duration correction value based on the aforementioned operating parameters; Obtain a preset base duration, and use the sum of the preset base duration and the duration correction value as the recycling duration.

7. A multi-split air conditioning control device, characterized in that, The multi-split air conditioning control device includes: The first control module is used to determine the shut-off indoor unit in the indoor unit when the air conditioner is in heating mode, and to control the shut-off indoor unit to disconnect from the refrigerant pipe. The first determining module is used to determine the terminal indoor unit among the shut-down indoor units; The first execution module is used to perform refrigerant recovery operations on the pipes corresponding to the terminal indoor unit; The first determining module includes: The first acquisition unit is used to acquire the pipe length between each of the shut-off indoor units and outdoor units; The first determining unit is configured to determine, among the shut-down indoor units, the first indoor unit whose piping length is greater than a first threshold. The first judgment unit is used to determine whether the number of the first indoor unit is 1; The first execution unit is configured to use the first indoor unit as the terminal indoor unit if the number of the first indoor units is 1.

8. An electronic device, characterized in that, The electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the multi-split air conditioning control method as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the multi-split air conditioning control method as described in any one of claims 1 to 6.

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