Multi-connected air conditioner, control method and computer-readable storage medium

Abstract

The present invention discloses a multi-connected air conditioner, a control method and a computer-readable storage medium. The method includes: determining a first indoor unit with a nominal capacity greater than a preset value from the already-opened indoor units; determining a second indoor unit communicated with the first indoor unit; controlling a three-way solenoid valve of a first bypass branch between the second indoor unit and the first indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch. The present invention enables the super-large indoor units in the air-conditioning system to ensure the refrigerant flow rate and better exert the capacity of the indoor units.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a multi-connected air conditioner, a control method thereof, and a computer-readable storage medium. Background Art

[0002] A one-to-many air conditioning system can realize the free combination of indoor units. The existing one-to-many general outdoor units can be combined with indoor units in various forms and sizes, but some combinations are also restricted. Especially when matching with large indoor units, it is easy to have situations where the capacity cannot be fully utilized or the indoor unit lacks refrigerant and frosting occurs. A one-to-many air conditioning system usually controls each indoor unit through a distribution valve. The sizes of the indoor units to be matched vary, and the required refrigerant flow rates also differ greatly. For extra-large indoor units, the caliber of the electronic expansion valve will be too small to provide sufficient refrigerant flow rate for the system, resulting in problems such as the inability to fully utilize the capacity of the indoor unit. Summary of the Invention

[0003] The main object of the present invention is to provide a multi-connected air conditioner, a control method thereof, and a computer-readable storage medium, aiming to solve the problem that the capacity of the indoor unit of the multi-connected air conditioner cannot be fully utilized.

[0004] To achieve the above object, a control method of a multi-connected air conditioner provided by the present invention is such that a bypass branch communicating with each other is provided between every two indoor units of the multi-connected air conditioner. The first end of the bypass branch is connected between the indoor heat exchanger and the outdoor heat exchanger of an indoor unit through a three-way solenoid valve, and the second end of the bypass branch is connected between the indoor heat exchanger and the throttle valve of another indoor unit through a three-way solenoid valve. The control method of the multi-connected air conditioner includes the following steps:

[0005] Determine a first indoor unit with a nominal capacity greater than a preset value from the already started indoor units;

[0006] Determine a second indoor unit connected to the first indoor unit;

[0007] Control the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch.

[0008] Optionally, the step of determining the second indoor unit connected to the first indoor unit includes:

[0009] When it is determined that there are at least two indoor units connected to the first indoor unit, use the unstarted indoor units as the second indoor units.

[0010] Optionally, the step of opening the three-way solenoid valve that controls the bypass branch between the second indoor unit and the first indoor unit, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch includes:

[0011] If the second indoor unit is an activated indoor unit, determine the third indoor unit connected to the second indoor unit;

[0012] Control the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, and at the same time control the three-way solenoid valve of the second bypass branch between the second indoor unit and the third indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the second indoor unit through the second bypass branch, while part of the refrigerant enters the first indoor unit through the first bypass branch.

[0013] Optionally, the first end of the bypass branch is connected between the indoor heat exchanger and the throttle valve of an indoor unit through a three-way solenoid valve. The step of opening the three-way solenoid valve that controls the first bypass branch between the second indoor unit and the first indoor unit, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch includes:

[0014] Control the throttle valve to open, and control the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch.

[0015] Optionally, the step of controlling the throttle valve to open includes:

[0016] Determine the opening degree and / or opening duration of the throttle valve according to the target refrigerant amount of the first indoor unit;

[0017] Open the throttle valve according to the opening degree and / or the opening duration.

[0018] Optionally, after the step of opening the three-way solenoid valve that controls the first bypass branch between the second indoor unit and the first indoor unit, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch, it further includes:

[0019] If the evaporator temperature of the first indoor unit does not meet the preset temperature condition, determine the fourth indoor unit connected to the second indoor unit;

[0020] Open the three-way solenoid valve that controls the first bypass branch between the second indoor unit and the first indoor unit, and open the three-way solenoid valve that controls the third bypass branch between the fourth indoor unit and the second indoor unit, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the third bypass branch and the first bypass branch.

[0021] Optionally, the step of determining the second indoor unit connected to the first indoor unit includes:

[0022] Determine the capacity requirement of the first indoor unit according to the indoor environmental parameters, outdoor environmental parameters, and nominal capacity;

[0023] Determine the target number of the second indoor units corresponding to the first indoor unit according to the capacity requirement;

[0024] Determine the second indoor unit according to the target number.

[0025] Optionally, the number of the first indoor units is at least two. After the step of opening the three-way solenoid valve that controls the first bypass branch between the second indoor unit and the first indoor unit, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch, the method further includes:

[0026] If the evaporator temperature of one of the first indoor units does not meet the preset temperature condition, determine the fifth indoor unit connected to the second indoor unit of the first indoor unit;

[0027] If the fifth indoor unit is included in the second indoor units of the remaining first indoor units, re-determine the second indoor units corresponding to the remaining first indoor units.

[0028] To achieve the above object, the present invention further provides a multi-connected air conditioner, which includes a memory, a processor, and a control program of the multi-connected air conditioner stored in the memory and executable on the processor. When the control program of the multi-connected air conditioner is executed by the processor, it realizes each step of the control method of the multi-connected air conditioner as described above.

[0029] To achieve the above object, the present invention further provides a computer-readable storage medium, which stores a control program of a multi-connected air conditioner. When the control program of the multi-connected air conditioner is executed by a processor, it realizes each step of the control method of the multi-connected air conditioner as described above.

[0030] A multi-connected air conditioner, a control method thereof, and a computer-readable storage medium provided by the present invention determine a first indoor unit with a nominal capacity greater than a preset value from the turned-on indoor units; determine a second indoor unit communicated with the first indoor unit; control a three-way solenoid valve of a first bypass branch between the second indoor unit and the first indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch. By controlling the refrigerant flow through multiple parallel three-way solenoid valves, the oversized indoor units in the air conditioning system can ensure the refrigerant flow, better exert the capacity of the indoor units, avoid the situation where the throttle valve has a small diameter and cannot provide a large flow of refrigerant, and expand the adaptability of the multi-connected air conditioner to the indoor units. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic hardware structure diagram of the multi-connected air conditioner according to the embodiment of the present invention;

[0032] Figure 2 It is a schematic flowchart of the first embodiment of the control method of the multi-connected air conditioner of the present invention;

[0033] Figure 3 It is a schematic structure diagram of the multi-connected air conditioner of the present invention;

[0034] Figure 4 It is a detailed flowchart of step S30 of the second embodiment of the control method of the multi-connected air conditioner of the present invention;

[0035] Figure 5 It is a schematic flowchart of the third embodiment of the control method of the multi-connected air conditioner of the present invention;

[0036] Figure 6 It is a schematic structure flowchart of the multi-connected air conditioner of the present invention;

[0037] Figure 7 It is a schematic flowchart of the fourth embodiment of the control method of the multi-connected air conditioner of the present invention;

[0038] Figure 8 It is a schematic flowchart of the fifth embodiment of the control method of the multi-connected air conditioner of the present invention.

[0039] The realization, functional features, and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] The main solution of the embodiment of the present invention is: determine a first indoor unit with a nominal capacity greater than a preset value from the turned-on indoor units; determine a second indoor unit connected to the first indoor unit; control the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch.

[0042] By controlling the refrigerant flow through multiple parallel three-way solenoid valves, the oversized indoor units in the air conditioning system can ensure the refrigerant flow, better exert the capacity of the indoor units, avoid the situation where the throttle valve has a small diameter and cannot provide a large flow of refrigerant, and expand the adaptability of the multi-connected air conditioner to the indoor units.

[0043] As an implementation solution, the multi-connected air conditioner can be as Figure 1 shown.

[0044] The embodiment solution of the present invention relates to a multi-connected air conditioner, which includes: a processor 101, such as a CPU, a memory 102, and a communication bus 103. Among them, the communication bus 103 is used to realize the connection and communication between these components.

[0045] The memory 102 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. As Figure 1 shown, the memory 102, as a computer-readable storage medium, may include a control program for the multi-connected air conditioner; and the processor 101 may be used to call the control program for the multi-connected air conditioner stored in the memory 102 and perform the following operations:

[0046] Determine a first indoor unit with a nominal capacity greater than a preset value from the turned-on indoor units;

[0047] Determine a second indoor unit connected to the first indoor unit;

[0048] Control the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch.

[0049] Based on the above hardware architecture of the multi-connected air conditioner, an embodiment of the control method of the multi-connected air conditioner of the present invention is proposed.

[0050] Referring to Figure 2 , Figure 2 is the first embodiment of the control method of the multi-connected air conditioner of the present invention. The control method of the multi-connected air conditioner includes the following steps:

[0051] Step S10, determine a first indoor unit with a nominal capacity greater than a preset value from the turned-on indoor units.

[0052] Optionally, as Figure 3 shown, a multi-connected air conditioner includes one outdoor unit and at least two indoor units. Taking three indoor units as an example, namely indoor unit 1, indoor unit 2, and indoor unit 3, bypass branches 54 that communicate with each other are provided between every two indoor units 53 of the multi-connected air conditioner.

[0053] Optionally, a bypass branch 54 is provided between indoor unit 1 and indoor unit 2. The first end of the bypass branch 54 is connected between the indoor heat exchanger and the outdoor heat exchanger 30 of indoor unit 1 through a three-way solenoid valve 52, and the second end of the bypass branch 54 is connected between the indoor heat exchanger and the throttle valve 51 of indoor unit 2 through a three-way solenoid valve 52.

[0054] Optionally, a bypass branch 54 is provided between indoor unit 2 and indoor unit 3. The first end of the bypass branch 54 is connected between the indoor heat exchanger and the outdoor heat exchanger 30 of indoor unit 2 through a three-way solenoid valve 52, and the second end of the bypass branch 54 is connected between the indoor heat exchanger and the throttle valve 51 of indoor unit 3 through a three-way solenoid valve 52.

[0055] Optionally, a bypass branch 54 is provided between indoor unit 1 and indoor unit 3. The first end of the bypass branch 54 is connected between the indoor heat exchanger and the outdoor heat exchanger 30 of indoor unit 1 through a three-way solenoid valve 52, and the second end of the bypass branch 54 is connected between the indoor heat exchanger and the throttle valve 51 of indoor unit 3 through a three-way solenoid valve 52.

[0056] Optionally, the throttle valve 51 can be an electronic expansion valve.

[0057] Optionally, the three-way solenoid valve 52 includes a first flow path, a second flow path, and a third flow path. Among them, the first flow path connects the outdoor heat exchanger and the bypass branch, the second flow path connects the outdoor heat exchanger and the indoor unit, and the third flow path connects the bypass branch and the indoor unit. The three-way solenoid valve 52 is used to switch between the first flow path, the second flow path, and the third flow path according to requirements to achieve the control of the refrigerant flow direction.

[0058] Determine a first indoor unit whose rated capacity is greater than a preset value among the turned-on indoor units, that is, the first indoor unit is an extra-large indoor unit. Among them, the rated capacity can be determined by the number of horsepower of the indoor unit, and the number of horsepower represents the power consumption of the indoor unit.

[0059] Step S20: Determine a second indoor unit that is connected to the first indoor unit.

[0060] Optionally, the second indoor unit is connected to the first indoor unit through a bypass branch.

[0061] Optionally, when there are at least two indoor units determined to be connected to the first indoor unit, the unturned-on indoor units are used as the second indoor units.

[0062] Optionally, determine the capacity requirement of the first indoor unit according to the indoor environment parameters, outdoor environment parameters and nominal capacity; determine the target number of the second indoor units corresponding to the first indoor unit according to the capacity requirement; and determine the second indoor units according to the target number.

[0063] Step S30: Control the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch.

[0064] Optionally, the three-way solenoid valve of the first bypass branch includes a three-way solenoid valve between the first indoor unit and the outdoor heat exchanger, and a three-way solenoid valve between the second indoor unit and the outdoor heat exchanger. When controlling the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, part of the refrigerant flowing out of the outdoor heat exchanger enters the first flow path of the three-way solenoid valve of the second indoor unit. The refrigerant enters the first bypass branch through the first flow path and enters the third flow path of the three-way solenoid valve of the first indoor unit from the first bypass branch, so as to enter the first indoor unit. At the same time, part of the refrigerant flowing out of the outdoor heat exchanger flows into the first indoor unit through the second flow path of the three-way solenoid valve of the first indoor unit, and the amount of refrigerant in the first indoor unit increases.

[0065] In the technical solution of this embodiment, the refrigerant flow rate is controlled by multiple parallel three-way solenoid valves. By controlling the refrigerant flow path of the three-way solenoid valve, the super-large indoor unit in the air-conditioning system can ensure the refrigerant flow rate, better exert the capacity of the indoor unit, avoid the situation that the throttle valve has a small diameter and cannot provide a large flow rate of refrigerant, and expand the adaptability of the multi-connected air conditioner to the indoor unit.

[0066] Refer to Figure 4 , Figure 4 This is the third embodiment of the control method of the multi-connected air conditioner of the present invention. Based on the first or second embodiment, the step S30 includes:

[0067] Step S31: If the second indoor unit is a turned-on indoor unit, determine the third indoor unit connected to the second indoor unit;

[0068] Step S32: Control the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, and at the same time control the three-way solenoid valve of the second bypass branch between the second indoor unit and the third indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the second indoor unit through the second bypass branch, while part of the refrigerant enters the first indoor unit through the first bypass branch.

[0069] Optionally, when the second indoor unit is an activated indoor unit, in order to ensure the normal operation of the first indoor unit and the second indoor unit, it is necessary to determine the third indoor unit connected to the second indoor unit. The refrigerant pipeline of the third indoor unit is used to supply refrigerant to the second indoor unit, and the refrigerant pipeline of the second indoor unit is used to supply refrigerant to the first indoor unit.

[0070] Optionally, the three-way solenoid valve of the first bypass branch includes a three-way solenoid valve a1 between the first indoor unit and the outdoor heat exchanger, and a three-way solenoid valve b1 between the second indoor unit and the outdoor heat exchanger; the three-way solenoid valve of the second bypass branch includes a three-way solenoid valve b2 between the second indoor unit and the outdoor heat exchanger, and a three-way solenoid valve c1 between the third indoor unit and the outdoor heat exchanger.

[0071] Control the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open. Part of the refrigerant flowing out of the outdoor heat exchanger enters the first flow path of the three-way solenoid valve of the second indoor unit. The refrigerant enters the first bypass branch through the first flow path and enters the third flow path of the three-way solenoid valve of the first indoor unit from the first bypass branch, thereby entering the first indoor unit. At the same time, part of the refrigerant flowing out of the outdoor heat exchanger flows into the first indoor unit through the second flow path of the three-way solenoid valve of the first indoor unit, and the amount of refrigerant in the first indoor unit increases.

[0072] At the same time, control the three-way solenoid valve of the second bypass branch between the second indoor unit and the third indoor unit to open. Part of the refrigerant flowing out of the outdoor heat exchanger enters the first flow path of the three-way solenoid valve of the third indoor unit. The refrigerant enters the second bypass branch through the first flow path and enters the third flow path of the three-way solenoid valve of the second indoor unit from the second bypass branch, thereby entering the second indoor unit. The operation of the second indoor unit is ensured.

[0073] Exemplarily, the first indoor unit is indoor unit 1, the second indoor unit is indoor unit 2, and the third indoor unit is indoor unit 3. When indoor unit 2 is an activated indoor unit, control the three-way solenoid valve of the second bypass branch between indoor unit 2 and indoor unit 3 to open. The refrigerant in indoor unit 3 enters the second bypass branch through the first flow path of the three-way solenoid valve, flows through the second bypass branch and enters the third flow path of the three-way solenoid valve of indoor unit 2, and then enters indoor unit 2. Part of the refrigerant flowing out of the outdoor heat exchanger enters the first bypass branch through the first flow path of the three-way solenoid valve of indoor unit 2, passes through the third flow path of the three-way solenoid valve of indoor unit 1, and then enters indoor unit 1, ensuring the normal operation of the extra-large indoor unit.

[0074] In the technical solution of this embodiment, when the second indoor unit is turned on, by determining the third indoor unit connected to the second indoor unit, while ensuring the amount of refrigerant in the first indoor unit, the operation of the second indoor unit is also ensured.

[0075] Refer to Figure 5 ,Figure 5 This is the third embodiment of the control method for a multi-connected air conditioner according to the present invention. Based on the first or second embodiment, step S30 includes:

[0076] Step S33: Control the throttle valve to open, and control the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch.

[0077] Optionally, as Figure 6 shown, a multi-connected air conditioner has one outdoor unit and at least two indoor units. Taking three indoor units as an example, indoor unit 1, indoor unit 2, and indoor unit 3, there are bypass branches 54 that are interconnected between every two indoor units 53 of the multi-connected air conditioner. Optionally, there is a bypass branch 54 between indoor unit 1 and indoor unit 2. The first end of the bypass branch 54 is connected between the indoor heat exchanger and the throttle valve 51 of indoor unit 1 through a three-way solenoid valve 52, and the second end of the bypass branch 54 is connected between the indoor heat exchanger and the throttle valve 51 of indoor unit 2 through a three-way solenoid valve 52. Optionally, there is a bypass branch 54 between indoor unit 2 and indoor unit 3. The first end of the bypass branch 54 is connected between the indoor heat exchanger and the throttle valve 51 of indoor unit 2 through a three-way solenoid valve 52, and the second end of the bypass branch 54 is connected between the indoor heat exchanger and the throttle valve 51 of indoor unit 3 through a three-way solenoid valve 52. Optionally, there is a bypass branch 54 between indoor unit 1 and indoor unit 3. The first end of the bypass branch 54 is connected between the indoor heat exchanger and the throttle valve 51 of indoor unit 1 through a three-way solenoid valve 52, and the second end of the bypass branch 54 is connected between the indoor heat exchanger and the throttle valve 51 of indoor unit 3 through a three-way solenoid valve 52. Therefore, before controlling the refrigerant flow direction, it is also necessary to control the throttle valve to open.

[0078] Optionally, the throttle valve 51 is an electronic expansion valve.

[0079] Optionally, determine the opening degree and / or opening duration of the throttle valve according to the target refrigerant amount of the first indoor unit; open the throttle valve according to the opening degree and / or the opening duration. The target refrigerant amount can be determined by the operating mode of the first indoor unit, indoor environmental parameters, outdoor environmental parameters, and nominal capacity.

[0080] The throttle valve is controlled to open, and the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit is controlled to open. Part of the refrigerant flowing out of the outdoor heat exchanger enters the first flow path of the three-way solenoid valve of the second indoor unit. The refrigerant enters the first bypass branch through the first flow path and enters the third flow path of the three-way solenoid valve of the first indoor unit from the first bypass branch, and thus enters the first indoor unit. At the same time, part of the refrigerant flowing out of the outdoor heat exchanger flows into the first indoor unit through the second flow path of the three-way solenoid valve of the first indoor unit, and the refrigerant amount in the first indoor unit increases.

[0081] In the technical solution of this embodiment, the refrigerant flow rate is controlled by the parallel connection of multiple three-way solenoid valves, and the refrigerant flow rate is controlled by the throttle valve, so that the super-large indoor unit in the air-conditioning system can ensure the refrigerant flow rate, better exert the capacity of the indoor unit, and expand the adaptability of the multi-connected air conditioner to the indoor unit.

[0082] Refer to Figure 7 , Figure 7 This is the fourth embodiment of the control method of the multi-connected air conditioner of the present invention. Based on any one of the first to third embodiments, after the step S30, it further includes:

[0083] Step S40, if the evaporator temperature of the first indoor unit does not meet the preset temperature condition, then determine the fourth indoor unit connected to the second indoor unit;

[0084] Step S50, control the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, and control the three-way solenoid valve of the third bypass branch between the fourth indoor unit and the second indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the third bypass branch and the first bypass branch.

[0085] Optionally, after running for a preset duration, the evaporator temperature of the first indoor unit does not meet the preset temperature condition. For example, the evaporator temperature is lower than the preset temperature value, indicating that the current refrigerant amount of the first indoor unit cannot meet the operation of the first indoor unit and more refrigerant amount is required. Then determine the fourth indoor unit connected to the second indoor unit. The refrigerant pipelines of the fourth indoor unit and the second indoor unit are used to provide refrigerant for the first indoor unit.

[0086] Open the three-way solenoid valve controlling the first bypass branch between the second indoor unit and the first indoor unit, open the three-way solenoid valve controlling the third bypass branch between the fourth indoor unit and the second indoor unit, and open the three-way solenoid valve controlling the first bypass branch between the second indoor unit and the first indoor unit. Part of the refrigerant flowing out of the outdoor heat exchanger enters the first flow path of the three-way solenoid valve of the second indoor unit. The refrigerant enters the first bypass branch through the first flow path and enters the third flow path of the three-way solenoid valve of the first indoor unit from the first bypass branch, thereby entering the first indoor unit. At the same time, part of the refrigerant flowing out of the outdoor heat exchanger flows into the first indoor unit through the second flow path of the three-way solenoid valve of the first indoor unit, and the amount of refrigerant in the first indoor unit increases.

[0087] At the same time, control the three-way solenoid valve of the third bypass branch between the second indoor unit and the fourth indoor unit to open. Part of the refrigerant flowing out of the outdoor heat exchanger enters the first flow path of the three-way solenoid valve of the fourth indoor unit. The refrigerant enters the third bypass branch through the first flow path and enters the third flow path of the three-way solenoid valve of the second indoor unit from the third bypass branch, enters the first bypass branch, and enters the third flow path of the three-way solenoid valve of the first indoor unit through the first bypass branch, thereby entering the first indoor unit, and the amount of refrigerant in the first indoor unit increases.

[0088] In the technical solution of this embodiment, the air-conditioning system can ensure the refrigerant flow rate even when paired with an extra-large indoor unit, can better exert the capabilities of the indoor unit, and expands the adaptability of the multi-connected air conditioner to the indoor unit.

[0089] Refer to Figure 8 , Figure 8 This is the fifth embodiment of the control method of the multi-connected air conditioner of the present invention. Based on any one of the first to fourth embodiments, after the step S30, it further includes:

[0090] Step S60, if the evaporator temperature of one of the first indoor units does not meet the preset temperature condition, determine the fifth indoor unit connected to the second indoor unit of the first indoor unit;

[0091] Step S70, if the fifth indoor unit is included in the second indoor units of the remaining first indoor units, re-determine the second indoor units corresponding to the remaining first indoor units.

[0092] Optionally, when the number of the first indoor units is at least two, taking two first indoor units as an example, the first indoor units include indoor unit 2 and indoor unit 5. If the evaporator temperature of indoor unit 1 does not meet the preset temperature condition, then determine the fifth indoor unit connected to the second indoor unit of indoor unit 1, and control the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open. Part of the refrigerant flowing out of the outdoor heat exchanger enters the first flow path of the three-way solenoid valve of the second indoor unit. The refrigerant enters the first bypass branch through the first flow path and enters the third flow path of the three-way solenoid valve of the first indoor unit from the first bypass branch, and then enters the first indoor unit. At the same time, part of the refrigerant flowing out of the outdoor heat exchanger flows into the first indoor unit through the second flow path of the three-way solenoid valve of the first indoor unit, and the amount of refrigerant in the first indoor unit increases. At the same time, control the three-way solenoid valve of the fourth bypass branch between the second indoor unit and the fifth indoor unit to open. Part of the refrigerant flowing out of the outdoor heat exchanger enters the first flow path of the three-way solenoid valve of the fifth indoor unit. The refrigerant enters the fourth bypass branch through the first flow path and enters the third flow path of the three-way solenoid valve of the second indoor unit from the fourth bypass branch, enters the first bypass branch, and enters the third flow path of the three-way solenoid valve of the first indoor unit through the first bypass branch, and then enters the first indoor unit, and the amount of refrigerant in the first indoor unit increases.

[0093] Optionally, if the second indoor unit of the remaining first indoor units includes the fifth indoor unit, then re-determine the second indoor unit corresponding to the remaining first indoor units. Exemplarily, the second indoor units of indoor unit 2 are indoor unit 1 and indoor unit 3, the fifth indoor unit is indoor unit 4, and the second indoor units of indoor unit 5 are indoor unit 4 and indoor unit 6. At this time, indoor unit 5 needs to adjust the corresponding second indoor unit, that is, the second indoor unit of indoor unit 5 is adjusted to indoor unit 6 and indoor unit 7.

[0094] Optionally, if the second indoor unit of the remaining first indoor units includes the first indoor unit, then re-determine the second indoor unit corresponding to the remaining first indoor units. Exemplarily, the second indoor units of indoor unit 2 are indoor unit 1 and indoor unit 3, the fifth indoor unit is indoor unit 4 and indoor unit 5, and the second indoor units of indoor unit 5 are indoor unit 4 and indoor unit 6. At this time, indoor unit 5 needs to adjust the corresponding second indoor unit, that is, the second indoor unit of indoor unit 5 is adjusted to indoor unit 6, indoor unit 7 and indoor unit 8.

[0095] In the technical solution of this embodiment, the refrigerant flow rate is controlled by multiple parallel three-way solenoid valves, so that the super-large indoor units in the air-conditioning system can ensure the refrigerant flow rate, better exert the capabilities of the indoor units, avoid the throttle valve having a small diameter and being unable to provide a large flow rate of refrigerant, support at least two super-large indoor units, and expand the adaptability of the multi-connected air conditioner to the indoor units.

[0096] The present invention also provides a multi-connected air conditioner, which includes a memory, a processor, and a control program of the multi-connected air conditioner stored in the memory and executable on the processor. When the control program of the multi-connected air conditioner is executed by the processor, it realizes each step of the control method of the multi-connected air conditioner as described in the above embodiments.

[0097] The present invention also provides a computer-readable storage medium, which stores a control program of a multi-connected air conditioner. When the control program of the multi-connected air conditioner is executed by a processor, it realizes each step of the control method of the multi-connected air conditioner as described in the above embodiments.

[0098] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0099] It should be noted that in this article, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, so that a process, system, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, system, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, system, article or device including the element.

[0100] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described embodiment system can be implemented by means of software plus a necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a computer-readable storage medium as described above (such as ROM / RAM, magnetic disk, optical disc), and includes several instructions for causing a terminal device (which can be a mobile phone, a computer, a parking management device, an air conditioner, or a network device, etc.) to execute the system described in each embodiment of the present invention.

[0101] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A control method for a multi-connected air conditioner, characterized in that A bypass branch that communicates with each other is provided between every two indoor units of the multi-connected air conditioner. The first end of the bypass branch is connected between the indoor heat exchanger and the outdoor heat exchanger of an indoor unit through a three-way solenoid valve. The second end of the bypass branch is connected between the indoor heat exchanger and the throttle valve of another indoor unit through a three-way solenoid valve. The method includes: Determine a first indoor unit with a nominal capacity greater than a preset value from the turned-on indoor units; Determine a second indoor unit that communicates with the first indoor unit; Control the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch. Among them, if the second indoor unit is a turned-on indoor unit, determine a third indoor unit that communicates with the second indoor unit; control the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, and at the same time control the three-way solenoid valve of the second bypass branch between the second indoor unit and the third indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the second indoor unit through the second bypass branch, and part of the refrigerant enters the first indoor unit through the first bypass branch.

2. The control method of the multi-connected air conditioner according to claim 1, wherein, The step of determining the second indoor unit that communicates with the first indoor unit includes: When it is determined that there are at least two indoor units that communicate with the first indoor unit, use the unturned-on indoor unit as the second indoor unit.

3. The control method of the multi-connected air conditioner according to claim 1, characterized in that, The first end of the bypass branch is connected between the indoor heat exchanger and the throttle valve of an indoor unit through a three-way solenoid valve. The step of controlling the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch includes: Control the throttle valve to open, and control the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch.

4. The control method of the multi-connected air conditioner according to claim 3, characterized in that, The step of controlling the throttle valve to open includes: Determine the opening degree and / or the opening duration of the throttle valve according to the target refrigerant amount of the first indoor unit; Open the throttle valve according to the opening degree and / or the opening duration.

5. The control method of the multi-connected air conditioner according to claim 1, characterized in that, After the step of controlling the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch, it further includes: If the evaporator temperature of the first indoor unit does not meet the preset temperature condition, determine a fourth indoor unit that communicates with the second indoor unit; Control the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, and control the three-way solenoid valve of the third bypass branch between the fourth indoor unit and the second indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the third bypass branch and the first bypass branch.

6. The control method of the multi-connected air conditioner according to claim 1, characterized in that, The step of determining the second indoor unit communicating with the first indoor unit includes: Determining the capacity requirement of the first indoor unit according to indoor environmental parameters, outdoor environmental parameters and nominal capacity; Determining the target number of the second indoor units corresponding to the first indoor unit according to the capacity requirement; Determining the second indoor unit according to the target number.

7. The control method of the multi-connected air conditioner according to claim 1, characterized in that, After the number of the first indoor units is at least two, and the step of controlling the three-way solenoid valve of the first bypass branch between the second indoor unit and the first indoor unit to open, so that part of the refrigerant flowing out of the outdoor heat exchanger enters the first indoor unit through the first bypass branch, further includes: If the evaporator temperature of one of the first indoor units does not meet the preset temperature condition, determining the fifth indoor unit communicating with the second indoor unit of the first indoor unit; If the fifth indoor unit is included in the second indoor units of the remaining first indoor units, re-determining the second indoor units corresponding to the remaining first indoor units.

8. A multi-connected air conditioner, characterized in that, The multi-connected air conditioner includes a memory, a processor, and a control program of the multi-connected air conditioner stored in the memory and executable on the processor. When the control program of the multi-connected air conditioner is executed by the processor, each step of the control method of the multi-connected air conditioner according to any one of claims 1-7 is implemented.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a control program of the multi-connected air conditioner. When the control program of the multi-connected air conditioner is executed by a processor, each step of the control method of the multi-connected air conditioner according to any one of claims 1-7 is implemented.

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