Air conditioning system, control method of air conditioning system, controller, and storage medium

Abstract

The application provides an air conditioning system, a control method of the air conditioning system, a controller and a computer readable storage medium, relates to the technical field of air conditioners, and can make the system operate under a more suitable refrigerant amount by setting an adjusting switch and a corresponding refrigerant storage tank group in an indoor unit, controlling the opening and closing of the adjusting switch, and adjusting the refrigerant flow of the corresponding indoor unit by using the adjusting switch and the refrigerant storage tank group according to the operating state of the indoor unit. In addition, in the case that there is more refrigerant, the excess refrigerant can be stored in the refrigerant storage tank group, the refrigerant at the outlet of the indoor unit of the indoor unit is further ensured to be gaseous, the heat exchange efficiency of the indoor unit is improved, the risk of liquid return caused by liquid refrigerant returning to the compressor is reduced, and the system reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to an air conditioning system, a control method of the air conditioning system, a controller and a computer readable storage medium. BACKGROUND

[0002] Multi-split air conditioner is a type of user central air conditioner, commonly known as "one drags many", which refers to an air conditioning system in which one outdoor unit is connected to two or more indoor units through a main system pipeline. Compared with traditional central air conditioning systems, multi-split air conditioners are widely used in small and medium-sized buildings and some public buildings due to their energy saving, reliable operation, advanced control, easy installation and other advantages. However, there are still many problems in the control of refrigerant quantity for multi-split air conditioners at present.

[0003] For the current multi-split air conditioner, the indoor unit corresponding to the indoor unit has many different specifications, and the corresponding optimal refrigerant quantity is not the same. Multi-split air conditioners are prone to problems such as excessive refrigerant, insufficient heat exchange, low heat exchange efficiency, and refrigerant leakage. For example, in the related art, if a "one drags two" multi-split air conditioner is matched with two indoor units with different indoor units, the refrigerant quantity charged by the outdoor unit is set according to the simultaneous operation of the two indoor units. When only one indoor unit needs to be turned on, the refrigerant quantity is too high for the indoor unit. At this time, there is a problem of insufficient heat exchange with excessive refrigerant, which reduces the heat exchange efficiency, and even in severe cases, there is a risk of refrigerant leakage. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides an air conditioning system, a control method of the air conditioning system, a controller and a computer readable storage medium, which can control the opening and closing of the corresponding adjustment switch according to the operating state of the indoor unit, so as to achieve the effect of adjusting the refrigerant flow of the indoor unit with the refrigerant storage tank group.

[0005] In a first aspect, an embodiment of the present application provides an air conditioning system, comprising:

[0006] an outdoor unit;

[0007] at least two indoor unit units arranged in parallel, the indoor unit units being in communication with the outdoor unit through a main system pipeline;

[0008] the indoor unit unit, comprising:

[0009] an indoor unit;

[0010] a first refrigerant branch connected between the indoor unit and the outdoor unit, the first refrigerant branch comprising a first valve for controlling the on-off state of the first refrigerant branch;

[0011] a second refrigerant branch connected between the indoor unit and the outdoor unit, the second refrigerant branch comprising a second regulating switch and a refrigerant accumulator group for storing refrigerant flowing through the second refrigerant branch, the second regulating switch being configured to regulate refrigerant flow of the second refrigerant branch;

[0012] a controller communicatively connected with the at least two indoor unit units respectively, the controller being configured to control opening and closing of the first valve or the second regulating switch according to operating states of the at least two indoor unit units, so as to regulate refrigerant flow of the corresponding indoor unit unit.

[0013] The air conditioning system according to the embodiments of the present application has at least the following beneficial effects: The embodiments of the present application set regulating switches and refrigerant accumulator groups in the indoor unit units, then acquire operating states of the indoor unit units, regulate refrigerant flow filled in the corresponding indoor unit units by controlling opening and closing of the regulating switches and using the refrigerant accumulator groups and the regulating switches, so that the system can operate under a more appropriate refrigerant amount. In addition, in the case of more refrigerant, the excess refrigerant can be stored in the refrigerant accumulator groups, further improving heat exchange efficiency of the indoor unit units, ensuring that refrigerant at an outlet of the indoor unit unit is gaseous, reducing the risk of liquid return to the compressor caused by liquid refrigerant, and increasing system reliability.

[0014] According to some embodiments of the present application, the second regulating switch comprises a second valve configured to control on-off state of the second refrigerant branch.

[0015] Alternatively,

[0016] The second regulating switch comprises a second valve configured to control on-off state of the second refrigerant branch and an electronic expansion valve configured to regulate refrigerant flow of the refrigerant accumulator group.

[0017] According to some embodiments of the present application, the operating state of the indoor unit unit comprises an open state and a closed state.

[0018] The controller is specifically configured to:

[0019] When all the indoor unit units are in the open state, the first valve of each indoor unit unit is opened, and the second regulating switch of the indoor unit unit is cut off.

[0020] When some indoor unit units are in the on state and the rest of the indoor unit units are in the off state, adjust the second regulating switch of the indoor unit unit in the on state, open the second valve and control the opening of the electronic expansion valve, adjust the refrigerant flow of the second refrigerant branch, cut off the first valve, and at the same time disconnect the first valve and the second regulating switch of the indoor unit unit in the off state.

[0021] When all indoor unit units are in the off state, the first valve and the second regulating switch of each indoor unit unit are shut off.

[0022] According to some embodiments of the present invention, the controller is communicatively connected to the outdoor unit, and the controller is used to generate a control signal based on the coil temperature of the indoor unit and the exhaust temperature of the outdoor unit to control the opening degree of the electronic expansion valve.

[0023] According to some embodiments of the present invention, the refrigerant storage tank group includes: one refrigerant storage tank, or two or more refrigerant storage tanks connected in series, or one or more refrigerant storage tanks connected in parallel.

[0024] According to some embodiments of the present invention, the total capacity of the refrigerant storage tank group is proportional to the sum of the internal volumes of the indoor units of the remaining indoor unit units.

[0025] Secondly, embodiments of the present invention also provide a control method for an air conditioning system, applied to a controller of the air conditioning system. The air conditioning system includes an outdoor unit and at least two indoor unit units connected in parallel. The indoor unit units are connected to the outdoor unit via a main system pipeline. Each indoor unit unit includes an indoor unit, a first refrigerant branch, and a second refrigerant branch. The first refrigerant branch includes a first valve, one end of which is connected to the main system pipeline, and the other end is connected to the indoor unit. The second refrigerant branch includes a second regulating switch and a refrigerant storage tank assembly. The refrigerant storage tank assembly is used to store refrigerant flowing through the second refrigerant branch, and the second regulating switch is used to regulate the refrigerant flow rate of the second refrigerant branch. The controller is communicatively connected to at least two of the indoor unit units.

[0026] The control method includes:

[0027] Obtain the operating status of at least two indoor unit units;

[0028] Based on the operating status of at least two of the indoor unit units, the opening and closing of the corresponding first valve and second regulating switch are controlled to regulate the refrigerant flow of the corresponding indoor unit unit.

[0029] The control method for an air conditioning system according to embodiments of the present invention has at least the following beneficial effects: Embodiments of the present invention include an adjustment switch and a refrigerant receiver tank in the indoor unit. The operating status of the indoor unit is then acquired, and the refrigerant flow rate in the corresponding indoor unit is adjusted by controlling the opening and closing of the adjustment switch and utilizing the refrigerant receiver tank and adjustment switch. This allows the system to operate with a suitable refrigerant level. Furthermore, when there is a large amount of refrigerant, the excess refrigerant can be stored in the refrigerant receiver tank, further improving the heat exchange efficiency of the indoor unit, ensuring that the refrigerant at the indoor unit outlet is gaseous, reducing the risk of liquid refrigerant returning to the compressor, and increasing system reliability.

[0030] According to some embodiments of the present invention, when there are two indoor unit units, the second regulating switch includes a second valve; when there are more than two indoor unit units, the second regulating switch includes a second valve and an electronic expansion valve.

[0031] According to some embodiments of the present invention, the operating states of the indoor unit include: an on state and a off state, and the step of controlling the opening and closing of the corresponding first valve and the second regulating switch according to the operating states of at least two of the indoor unit units to regulate the refrigerant flow of the corresponding indoor unit includes:

[0032] When all indoor unit units are in the on state, open the first valve of each indoor unit unit and cut off the second regulating switch of the indoor unit unit;

[0033] When some indoor unit units are in the on state and the rest of the indoor unit units are in the off state, adjust the second regulating switch of the indoor unit unit in the on state, open the second valve and / or control the opening of the electronic expansion valve, adjust the refrigerant flow of the second refrigerant branch, cut off the first valve, and at the same time disconnect the first valve and the second regulating switch of the indoor unit unit in the off state.

[0034] When all indoor unit units are in the off state, the first valve and the second regulating switch of each indoor unit unit are shut off.

[0035] According to some embodiments of the present invention, the controller is communicatively connected to the outdoor unit, and further includes:

[0036] A control signal is generated based on the coil temperature of the indoor unit and the exhaust temperature of the outdoor unit to control the opening degree of the electronic expansion valve.

[0037] According to some embodiments of the present invention, the refrigerant storage tank group includes: a refrigerant storage tank, or one or more refrigerant storage tanks connected in series, or one or more refrigerant storage tanks connected in parallel.

[0038] According to some embodiments of the present invention, the total capacity of the refrigerant storage tank group is proportional to the sum of the internal volumes of the indoor units of the remaining indoor unit units.

[0039] Thirdly, embodiments of the present invention provide a controller, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the control method of the air conditioning system as described in the second aspect above.

[0040] The controller according to embodiments of the present invention has at least the following beneficial effects: The present invention provides an adjustment switch and a refrigerant receiver tank in the indoor unit, then acquires the operating status of the indoor unit, and adjusts the refrigerant flow rate in the corresponding indoor unit by controlling the opening and closing of the adjustment switch and utilizing the refrigerant receiver tank and adjustment switch, thereby enabling the system to operate with a more suitable refrigerant quantity. Furthermore, when there is a large amount of refrigerant, the excess refrigerant can be stored in the refrigerant receiver tank, further improving the heat exchange efficiency of the indoor unit, ensuring that the refrigerant at the indoor unit outlet is always gaseous, reducing the risk of liquid refrigerant returning to the compressor, and increasing system reliability.

[0041] Fourthly, embodiments of the present invention provide an air conditioning system, including the controller described in the third aspect above.

[0042] The air conditioning system according to embodiments of the present invention has at least the following beneficial effects: Embodiments of the present invention include an adjustment switch and a refrigerant receiver tank in the indoor unit. The operating status of the indoor unit is then acquired, and the refrigerant flow rate in the corresponding indoor unit is adjusted by controlling the opening and closing of the adjustment switch and utilizing the refrigerant receiver tank and adjustment switch. This allows the system to operate with a more suitable refrigerant level. Furthermore, when there is a large amount of refrigerant, the excess refrigerant can be stored in the refrigerant receiver tank, further improving the heat exchange efficiency of the indoor unit, ensuring that the refrigerant at the indoor unit outlet is always in a gaseous state, reducing the risk of liquid refrigerant returning to the compressor, and increasing system reliability.

[0043] According to some embodiments of the present invention, the air conditioning system further includes a main air conditioner, which communicates with the controller.

[0044] Fifthly, embodiments of the present invention provide a computer-readable storage medium storing computer-executable instructions for performing the control method as described in the second aspect above.

[0045] The computer-readable storage medium according to embodiments of the present invention has at least the following beneficial effects: Embodiments of the present invention include an adjustment switch and a refrigerant receiver tank in the indoor unit. The operating status of the indoor unit is then acquired, and the refrigerant flow rate in the corresponding indoor unit is adjusted by controlling the opening and closing of the adjustment switch and utilizing the refrigerant receiver tank and adjustment switch. This allows the system to operate with a more suitable refrigerant level. Furthermore, when there is a large amount of refrigerant, the excess refrigerant can be stored in the refrigerant receiver tank, further improving the heat exchange efficiency of the indoor unit, ensuring that the refrigerant at the indoor unit outlet is gaseous, reducing the risk of liquid refrigerant returning to the compressor, and increasing system reliability.

[0046] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0047] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0048] Figure 1 This is a schematic diagram of the structure of a controller for performing a control method for an air conditioning system according to an embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram of the structure of an air conditioning system provided in one embodiment of the present invention;

[0050] Figure 3 This is yet another schematic diagram of the structure of an air conditioning system provided in one embodiment of the present invention;

[0051] Figures 4a to 4b A schematic diagram of the indoor unit structure of an air conditioning system provided in one embodiment of the present invention;

[0052] Figure 5 This is yet another schematic diagram of the structure of an air conditioning system provided in one embodiment of the present invention;

[0053] Figure 6 This is a schematic diagram of the refrigerant storage tank assembly of an air conditioning system provided in another embodiment of the present invention;

[0054] Figure 7 This is a flowchart of a control method for an air conditioning system provided in another embodiment of the present invention;

[0055] Figure 8 This is a flowchart of a control method for an air conditioning system provided in another embodiment of the present invention;

[0056] Figure 9This is a flowchart of a control method for an air conditioning system provided in another embodiment of the present invention. Detailed Implementation

[0057] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0058] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0059] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0060] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0061] In related technologies, existing multi-split air conditioning systems have indoor units with varying internal volumes, each requiring a different optimal amount of refrigerant. Refrigerant is the working fluid used in refrigeration and air conditioning systems to transfer heat and produce a cooling effect. For example, when two indoor units have different internal volumes, the amount of refrigerant charged by the outdoor unit in a multi-split air conditioning system is generally set for simultaneous operation of both indoor units. Therefore, when only one indoor unit needs to be turned on, the amount of refrigerant charged may be excessive for that unit, leading to insufficient heat exchange and reduced heat exchange efficiency. Furthermore, excessive refrigerant can cause a large amount of liquid refrigerant to return to the compressor through the indoor unit, potentially damaging the compressor and reducing the air conditioner's operational reliability. Additionally, there is a risk of refrigerant leakage. If a refrigerant leak occurs, continued operation of the indoor unit will cause the air conditioner compressor to frequently shut down and restart for protective purposes, eventually burning out due to insufficient oil supply.

[0062] Based on the above, embodiments of the present invention provide an air conditioning system and a control method for the air conditioning system, along with a corresponding controller and a computer-readable storage medium. Specifically, the air conditioning system of this embodiment includes an adjustment switch and a refrigerant receiver tank in the indoor unit. The system acquires the operating status of the indoor unit and adjusts the refrigerant flow rate in the corresponding indoor unit by controlling the opening and closing of the adjustment switch, thereby enabling the system to operate with a suitable refrigerant level. Furthermore, when there is a large amount of refrigerant, the excess refrigerant can be stored in the refrigerant receiver tank, further improving the heat exchange efficiency of the indoor unit, ensuring that the refrigerant at the indoor unit outlet is gaseous, reducing the risk of liquid refrigerant returning to the compressor, and increasing system reliability.

[0063] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0064] like Figure 1 As shown, Figure 1 This is a schematic diagram of a controller 100 for performing a control method for an air conditioning system according to an embodiment of the present invention. The controller 100 of this embodiment includes one or more processors 110 and a memory 120. Figure 1 The example uses a processor 110 and a memory 120.

[0065] Processor 110 and memory 120 can be connected via a bus or other means. Figure 1 Taking the example of a connection between China and Israel via a bus.

[0066] Memory 120, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Additionally, memory 120 may include high-speed random access memory, and may also include non-transitory memory, such as at least two disk storage devices, flash memory devices, or other non-transitory solid-state storage devices. In some embodiments, memory 120 may optionally include memory 120 remotely located relative to processor 110, and these remote memories can be connected to controller 100 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0067] Those skilled in the art will understand that Figure 1 The device structure shown does not constitute a limitation on the controller 100 and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0068] exist Figure 1In the controller 100 shown, the processor 110 can be used to call the relevant control program for controlling the air conditioning system stored in the memory 120. According to the on or off state of the indoor unit in the multi-split air conditioning system, the processor controls the opening and closing of the corresponding regulating switch. The regulating switch in the refrigerant branch and the refrigerant liquid tank group are used together to regulate the refrigerant flow of the corresponding indoor unit, thereby realizing the control of the multi-split air conditioning system.

[0069] Based on the hardware structure of the controller 100 described above, various embodiments of the air conditioning system of the present invention are proposed.

[0070] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of an air conditioning system provided in one embodiment of the present invention.

[0071] Specifically, in this embodiment of the invention, the air conditioning system includes: a controller 100, an outdoor unit 200, and at least two indoor unit units 300, which can be arranged in parallel (the figure shows four indoor unit units as an example, which does not represent a limitation on the number of indoor unit units). It also includes a main system pipeline, which is used to connect the outdoor unit 200 and the aforementioned indoor unit units 300 to realize the transmission of gas or liquid.

[0072] In one embodiment, during the operation of the multi-split air conditioning system, the controller 100 communicates with the outdoor unit 200 and each indoor unit 300 via a communication connection, thereby acquiring the operating data of the outdoor unit 200 and each indoor unit 300, and transmitting control signals and sending control commands to the outdoor unit 200 and the indoor unit 300.

[0073] In addition, it is understood that the installation location of the controller 100 can be installed on the outdoor unit 200 or independently of the outdoor unit 200 and the indoor unit 300. In this embodiment, the installation location of the controller 100 is not specifically limited.

[0074] In another embodiment, the controller 100 may also be a terminal. The terminal communicates with the outdoor unit 200 and the indoor unit 300 via a wireless network. The terminal obtains the operating data of the outdoor unit 200 and each indoor unit 300, and sends control commands to the outdoor unit 200 and the indoor unit 300. It is understood that the terminal here includes, but is not limited to, mobile phones, wearable electronic devices, tablet computers, or computers.

[0075] like Figure 3 As shown, Figure 3 This is another schematic diagram of the structure of an air conditioning system provided in an embodiment of the present invention.

[0076] This embodiment is based on the above. Figure 2 Based on the structure of the central air conditioning system, the structure of the indoor unit 300 is further described in detail.

[0077] The air conditioning system in this embodiment of the invention includes: a controller 100, an outdoor unit 200, and multiple indoor unit units 300 (which can be set in parallel), and also includes a main system pipeline that connects the outdoor unit 200 and the aforementioned indoor unit units 300 (the number of which is not limited in the figure).

[0078] In addition, the controller 100 is communicatively connected to the outdoor unit 200 and the indoor unit 300 respectively.

[0079] The structure of the indoor unit 300 includes an indoor unit 303 and two parallel refrigerant branches 301 and 302. The internal structure of each indoor unit 300 is identical.

[0080] Specifically, the first refrigerant branch 301 is connected between the indoor unit 303 and the outdoor unit 200. The first refrigerant branch 301 includes a first valve 3011 that can control the on / off state of the first refrigerant branch 301.

[0081] One end of the first valve 3011 is connected to the main system pipeline, and the other end is connected to the indoor unit 303 to form the first refrigerant branch.

[0082] Specifically, the second refrigerant branch 302 is connected between the indoor unit 303 and the outdoor unit 200, and can regulate the refrigerant flow of the second refrigerant branch. The second refrigerant branch 302 includes a second regulating switch 3021 and a refrigerant liquid storage tank group 3022.

[0083] The refrigerant flowing through the second refrigerant branch 302 can be stored in the refrigerant storage tank group 3022. The flow rate of the refrigerant flowing out of the refrigerant storage tank group 3022 can be controlled by adjusting the second regulating switch 3021. The two only need to be connected in series; their relative positions are not limited. The diagram illustrates this by showing one end of the second regulating switch 3021 connected to the main system pipeline and the other end connected to the refrigerant storage tank group 3022, with the other end of the refrigerant storage tank group 3022 connected to one end of the indoor unit 303. This does not imply any limitation on their relative positions.

[0084] In one embodiment, the controller 100 controls the opening and closing of the corresponding first valve 3011 and the second regulating switch 3021 according to the operating status of the indoor unit 300, so as to use the second regulating switch 3021 in conjunction with the refrigerant storage tank group 3022 to regulate and control the refrigerant flow of the indoor unit 300.

[0085] The indoor unit 300 has two main operating states: on and off.

[0086] For example, the operating status of the indoor unit 300 can be obtained through manual settings or preset time period changes. For instance, when a user manually turns on the switch of an indoor unit 300, it is considered that the indoor unit 300 is currently on; or, if a user sets the time period of 18:00-7:00 to turn on an indoor unit 300 through a smart terminal or IoT control platform, it is considered that the indoor unit 300 is currently on, and this operating status is sent to the controller 100 through the communication link.

[0087] Specifically, the air conditioning system also includes necessary components such as a compressor and condenser (not shown in the figure) to complete the basic functions of air conditioning. The compressor, condenser and indoor unit are connected in sequence through pipes to form a refrigerant circulation loop, realizing the basic functions and further functions of the air conditioning system.

[0088] In one embodiment, such as Figures 4a to 4b The diagram shown is a schematic diagram of the indoor unit structure of an air conditioning system provided in an embodiment of the present invention.

[0089] Among them, reference Figure 4a The second regulating switch 3021 can be a second valve 3024, that is, the second valve 3024 and the refrigerant storage tank group 3022 are used to control the refrigerant flow.

[0090] refer to Figure 4b The second regulating switch 3021 can be either a second valve 3024 or an electronic expansion valve 3023. Their relative positions are not specifically defined. Figure 4b This is just one illustration. One end of the second regulating switch 3021 is connected to the main system pipeline, and the other end is connected to the refrigerant liquid storage tank group 3022. The other end of the refrigerant liquid storage tank group 3022 is connected to one end of the electronic expansion valve 3023, and the other end of the electronic expansion valve 3023 is connected to one end of the indoor unit 303.

[0091] The 3022 refrigerant storage tank assembly is used to store refrigerant. Refrigerant is a substance that easily absorbs heat to become a gas and easily releases heat to become a liquid. For example, ammonia was previously used as refrigerant. When ammonia is pressurized, it releases heat and becomes a liquid; when the high-pressure liquid is depressurized and becomes a gas, it absorbs heat. It is mainly used in refrigeration and air conditioning systems to transfer heat energy and produce a cooling effect.

[0092] The 3023 electronic expansion valve is a throttling element that allows the refrigerant flow (e.g., refrigerant) to enter the refrigeration unit according to a preset program. In applications with drastic load changes or a wide range of operating conditions, traditional throttling elements (such as capillary tubes and thermostatic expansion valves) can no longer meet the requirements for comfort and energy saving. Therefore, electronic expansion valves combined with compressor variable capacity technology have been increasingly widely used. Currently, electronic expansion valves have become an important component of intelligent refrigeration systems and a crucial means and guarantee for truly optimizing refrigeration systems. In addition to being used in dry-type evaporators, they can also be used in flooded evaporators.

[0093] like Figure 5 As shown, Figure 5 This is another schematic diagram of the structure of an air conditioning system provided in an embodiment of the present invention.

[0094] In this embodiment, reference Figure 5 In the above Figure 3 Based on the structure of the central air conditioning system, taking two indoor unit units 300 as an example, when two indoor unit units 300 are set, the second regulating switch 3021 can be: the second valve 3024, that is, the second valve 3024 and the refrigerant liquid tank group 3022 are used together to control the refrigerant flow.

[0095] In one embodiment, the controller 100 is used to select a corresponding control strategy based on the operating status of the indoor unit to control the opening and closing of the first valve and the second regulating switch, thereby adjusting the refrigerant flow rate charged in the indoor unit. The control strategies include the following three types.

[0096] (1) All indoor unit units are in the ON state:

[0097] In this state, the amount of refrigerant charged into the outdoor unit is appropriate for each indoor unit, and there will be no problem of too much or too little refrigerant.

[0098] Therefore, the first valve of each indoor unit is opened, and the second regulating switch of the indoor unit is turned off. In this state, it is not necessary to open the second regulating switch to use the corresponding refrigerant storage tank to store excess refrigerant.

[0099] (2) Some indoor unit units are in the on state, while the rest are in the off state:

[0100] Adjust the second regulating switch of the indoor unit that is currently in the open state, cut off the first valve, and at the same time cut off the first valve and the second regulating switch of all indoor unit units that are in the closed state.

[0101] For this operating state, on the one hand, by adjusting the second regulating switch of the indoor unit that is in the open state, the first valve is cut off. That is, for the indoor unit that is currently in the open state, the second refrigerant branch is activated, the second valve is opened, and / or the opening degree of the electronic expansion valve is controlled.

[0102] In this embodiment, on one hand, when there are more than two indoor unit units, an electronic expansion valve is used to regulate the refrigerant flow in the circulation loop of the air conditioning system. The electronic expansion valve is connected in series with the refrigerant receiver tank. By controlling the opening degree of the electronic expansion valve, the amount of refrigerant flowing out of the refrigerant receiver tank is affected, thus achieving control of the refrigerant flow. On the other hand, when there are two indoor unit units, a second valve and the refrigerant receiver tank are used to control the refrigerant flow.

[0103] The refrigerant receiver tank can be used to store excess refrigerant, ensuring that the refrigerant flow rate at the indoor unit outlet is appropriate, improving the heat exchange efficiency of the indoor unit, and avoiding the risk of liquid refrigerant returning to the compressor, thus increasing system reliability.

[0104] In addition, the first valve and the second regulating switch of the indoor unit that is in the off state are both cut off, which ensures that there is no refrigerant charge in the indoor unit that is currently in the off state.

[0105] (3) All indoor unit units are in the off state:

[0106] Cut off the first valve and second regulating switch of each indoor unit.

[0107] If the indoor unit is in the off state, it does not need to be charged with refrigerant to work. Therefore, the first and second refrigerant branches corresponding to each indoor unit can be disconnected.

[0108] In one embodiment, when there are two or more indoor unit units, the refrigerant flow rate can be adjusted using an electronic expansion valve in conjunction with a refrigerant receiver tank. For example, a feedforward and feedback combined adjustment method can be used, utilizing the coil temperature of the indoor unit and the exhaust temperature of the outdoor unit condenser to adjust the opening degree. According to the air conditioning design concept, the exhaust temperature of the outdoor unit condenser is related to the coil temperature of the indoor unit and the operating frequency of the compressor.

[0109] In one embodiment, the adjustment time is set to T. M That is, when the compressor is turned on, every T M The time interval is used to calculate the exhaust temperature of the outdoor unit condenser. Different adjustment times can be set to calculate the exhaust temperature of multiple outdoor unit condensers, and then the average value is taken.

[0110] Let the opening degree of the electronic expansion valve be denoted as Fx, the coil temperature of the indoor unit be denoted as T2, and the exhaust temperature of the outdoor unit condenser be denoted as T. P0 T P0 The range of values ​​for PMV can be expressed as PMV. TRGTP_MIN_ADD ≤T P0 ≤PMV TRGTP_MAX_ADD Among them, PMV TRGTP_MIN_ADD and PMV TRGTP_MAX_ADD This represents the upper and lower temperature limits, both of which are integers and can be empirical values.

[0111] The relationship between the above three can be expressed as follows:

[0112] T P0 = aFx + b*T2 + c*(T3 - T) 30 )+d+T HZC

[0113] Among them, T HZC This indicates the compressor's operating frequency, 'a' represents the first coefficient, 'b' represents the second coefficient, 'c' represents the third coefficient, 'd' represents the fourth coefficient, and T3 represents the outdoor unit's condenser temperature. 30 This indicates a temperature limit.

[0114] In one embodiment, the limiting conditions for the above parameters are as follows:

[0115] The first coefficient 'a' has a range of values ​​[0, 2.55] and needs to be accurate to two decimal places.

[0116] The second coefficient b has a range of values ​​[0, 2.55], and needs to be accurate to the nearest whole number.

[0117] The value range of the third coefficient c is [-127, 127], and it needs to be accurate to the nearest whole number.

[0118] The fourth coefficient d is a constant, and its value range is [-127, 127].

[0119] Limiting temperature T 30 This represents the minimum outdoor unit condenser temperature T3 within a preset time period. For example, if the preset time period is (7-12 minutes), then T... 30 This indicates the minimum outdoor unit condenser temperature T3 within 7-12 minutes.

[0120] (T3-T 30 The value of ) cannot be greater than 0. It can be 0 or a negative number. If the calculated value is greater than 0, then this value is set to equal to 0.

[0121] In one embodiment, T2 can be the average of two adjustment cycles. This is done to prevent excessive changes in the calculation of the exhaust temperature of the outdoor unit condenser and to improve the accuracy of the calculation.

[0122] like Figure 6 As shown, Figure 6 This is a schematic diagram of the structure of a refrigerant storage tank assembly provided in one embodiment of the present invention.

[0123] In this embodiment, the refrigerant storage tank assembly 3022 includes three different structures, namely:

[0124] First structure: a refrigerant storage tank 30221, the total refrigerant storage capacity of the refrigerant storage tank group 3022 is the total amount of the refrigerant storage tank 30221.

[0125] Second structure: one or more refrigerant storage tanks 30221 connected in series, the total refrigerant storage capacity of the refrigerant storage tank group 3022 is the sum of the total capacity of the multiple refrigerant storage tanks 30221 connected in series.

[0126] The third structure consists of one or more refrigerant storage tanks 30221 connected in parallel, the total refrigerant storage capacity of the refrigerant storage tank group 3022 being the sum of the total capacity of the multiple refrigerant storage tanks 30221 connected in series.

[0127] In one embodiment, the total refrigerant capacity stored in the refrigerant reservoir of each indoor unit is proportional to the sum of the internal volumes of the remaining indoor units. The internal volume of the indoor unit represents the required refrigerant capacity of that indoor unit, or its cooling capacity or corresponding air conditioning horsepower.

[0128] In one embodiment, for example when there are two indoor unit units, the total capacity of refrigerant stored in the refrigerant reservoir is the same as the internal volume of the indoor unit in the other indoor unit (i.e., the proportionality coefficient is 1). In this case, the electronic expansion valve is removed, and only the refrigerant reservoir is used for refrigerant flow control, or the electronic expansion valve is used, but the opening degree of the electronic expansion valve is fully open.

[0129] The following example illustrates this.

[0130] Assume that the internal volume of the indoor unit in indoor unit 1 is 1L and the internal volume of the indoor unit in indoor unit 2 is 2L.

[0131] The total refrigerant requirement is 1L + 2L = 3L;

[0132] Therefore, the total refrigerant storage capacity of the refrigerant receiver tank of indoor unit 1 is set to 2L (the same as the refrigerant storage volume of indoor unit 2), and the total refrigerant storage capacity of the refrigerant receiver tank of indoor unit 2 is set to 1L (the same as the refrigerant storage volume of indoor unit 1).

[0133] In one embodiment, if there are more than two indoor unit units, for example, five indoor unit units, since one to five indoor unit units may be turned on simultaneously, the total refrigerant storage capacity in the refrigerant reservoir of each indoor unit unit can be the sum of the refrigerant storage volumes of the indoor units in the other indoor unit units, or proportional to the sum of the refrigerant storage volumes of the indoor units in the other indoor unit units. The proportionality coefficient can be slightly less than 1, ensuring that the total capacity of the refrigerant reservoir of the indoor unit units in the turned-on state can accommodate excess refrigerant. At this time, the total refrigerant storage capacity in the refrigerant reservoir of the indoor unit unit may be much greater than the refrigerant demand of the corresponding indoor unit. Therefore, the refrigerant flow rate of the second refrigerant branch can be adjusted by controlling the opening degree of the corresponding electronic expansion valve, thereby ensuring that the refrigerant of the corresponding indoor unit is at an appropriate level.

[0134] The above three structures can be selected according to the needs during use. Since the volume of refrigerant storage tanks of different capacities is different, when designing different air conditioning system structures, the corresponding structure can be selected according to factors such as structural layout, equipment size or installation location.

[0135] Based on the hardware structure of the air conditioning system described above, various embodiments of the control method of the air conditioning system of the present invention are described below.

[0136] like Figure 7 As shown, Figure 7 This is a flowchart of a control method for an air conditioning system provided in an embodiment of the present invention, as shown in the hardware structure of the multi-split air conditioning system described above. The air conditioning system includes a controller, an outdoor unit, and multiple indoor unit units (which can be set in parallel), and also includes a main system pipeline that connects the outdoor unit to the multiple indoor unit units.

[0137] The controller communicates with both the outdoor and indoor units.

[0138] The indoor unit includes an indoor unit and two parallel refrigerant branches: a first refrigerant branch and a second refrigerant branch. The internal structure of each indoor unit is identical.

[0139] Specifically, the first refrigerant branch includes the first valve.

[0140] One end of the first valve is connected to the main system pipeline, and the other end is connected to the indoor unit to form the first refrigerant branch.

[0141] Specifically, the second refrigerant branch includes a second regulating switch and a refrigerant storage tank assembly.

[0142] The refrigerant receiver tank is used to store the refrigerant flowing through the second refrigerant branch, and the second regulating switch 3021 is used to regulate the refrigerant flow in the second refrigerant branch. They only need to be connected in series; their relative positions are not limited. For example, one end of the second regulating switch can be connected to the main system piping, and the other end to the refrigerant receiver tank, with the other end of the refrigerant receiver tank connected to one end of the indoor unit.

[0143] refer to Figure 7 The control method of this invention is applied to the controller of the above-mentioned air conditioning system, including but not limited to steps S100 and S200.

[0144] Step S100: Obtain the operating status of the indoor unit, for example, the number of indoor unit units is two or more.

[0145] The indoor unit's operating status mainly includes two states: on and off. The operating status can be determined by the user manually setting or changing the status within a preset time period. For example, when a user manually turns on an indoor unit, it is considered to be on; or, if a user sets an indoor unit to be on between 18:00 and 7:00 via a smart terminal or IoT control platform, it is considered to be on, and this operating status is sent to the controller via the communication link.

[0146] In step S200, the opening and closing of the corresponding first valve and second regulating switch are controlled according to the operating status of the indoor unit, thereby regulating the refrigerant flow of the indoor unit.

[0147] In this embodiment, step S200, through the set regulating switch and the corresponding refrigerant receiver tank, adjusts the refrigerant flow of the corresponding indoor unit by controlling the opening and closing of the regulating switch according to the operating status of the indoor unit, thereby enabling the system to operate with a more suitable refrigerant quantity. Furthermore, when there is a large amount of refrigerant, storing the excess refrigerant in the refrigerant receiver tank further ensures that the refrigerant at the indoor unit outlet is in a gaseous state, improving the heat exchange efficiency of the indoor unit and reducing the risk of liquid refrigerant returning to the compressor, thus increasing system reliability.

[0148] like Figure 8 As shown, Figure 8 This is a flowchart of a control method for an air conditioning system provided in an embodiment of the present invention, specifically executing the judgment logic of step S200 above.

[0149] In this embodiment, step S200 is as follows: Based on the operating status of the indoor unit, a corresponding control strategy is selected to control the opening and closing of the first valve and the second regulating switch, so as to use the second regulating switch in combination with the refrigerant storage tank group to regulate the refrigerant flow rate charged in the indoor unit. That is, a corresponding control strategy is selected based on the operating status of the indoor unit, including the following three strategies.

[0150] (1) All indoor unit units are in the ON state:

[0151] Since the amount of refrigerant charged into the outdoor unit is set based on the simultaneous operation of all indoor units, if all indoor units are in the on state, the amount of refrigerant charged into the outdoor unit is appropriate for each indoor unit, and there will be no problem of too much or too little refrigerant.

[0152] In this state, it is not necessary to open the second regulating switch to use the corresponding refrigerant storage tank group to store excess refrigerant. Therefore, the first valve of each indoor unit is opened, and the second regulating switch of the indoor unit is turned off.

[0153] (2) Some indoor unit units are in the on state, while the rest are in the off state:

[0154] Adjust the second regulating switch of the indoor unit that is currently in the open state, cut off the first valve, and at the same time cut off the first valve and the second regulating switch of all indoor unit units that are in the closed state.

[0155] Since the amount of refrigerant charged into the outdoor unit is set based on the simultaneous operation of all indoor units, if some indoor units are in the on state, the amount of refrigerant charged into the outdoor unit will inevitably be too much for that indoor unit. This will result in insufficient heat exchange due to excessive refrigerant, reduced heat exchange efficiency, and even the risk of refrigerant leakage if the amount of refrigerant is too much.

[0156] Therefore, for this operating state, on the one hand, by adjusting the second regulating switch of the indoor unit that is in the open state, the first valve is cut off. That is, for the indoor unit that is currently in the open state, the second refrigerant branch is activated, the second valve is opened, and / or the opening degree of the electronic expansion valve is controlled.

[0157] In this embodiment, on one hand, when there are more than two indoor unit units, an electronic expansion valve is used to regulate the refrigerant flow in the circulation loop of the air conditioning system. The electronic expansion valve is connected in series with the refrigerant receiver tank. By controlling the opening degree of the electronic expansion valve, the amount of refrigerant flowing out of the refrigerant receiver tank is affected, thus achieving control of the refrigerant flow. On the other hand, when there are two indoor unit units, a second valve and the refrigerant receiver tank are used to control the refrigerant flow.

[0158] The refrigerant receiver tank can be used to store excess refrigerant, ensuring that the refrigerant flow rate at the indoor unit outlet is appropriate, improving the heat exchange efficiency of the indoor unit, and avoiding the risk of liquid refrigerant returning to the compressor, thus increasing system reliability.

[0159] In addition, the first valve and the second regulating switch of the indoor unit that is in the off state are both cut off, which ensures that there is no refrigerant charge in the indoor unit that is currently in the off state.

[0160] (3) All indoor unit units are in the off state:

[0161] Cut off the first valve and second regulating switch of each indoor unit.

[0162] If all indoor unit units are in the off state, the indoor unit units do not need to be charged with refrigerant to work. Therefore, the first and second refrigerant branches corresponding to each indoor unit unit can be disconnected.

[0163] It is understood that after the air conditioning system in this embodiment is shut down, if there is a refrigerant recovery operation, the refrigerant stored in the refrigerant storage tank will flow back to the total refrigerant storage location so that the air conditioning system can be used for refrigerant scheduling the next time it is in operation. In related technologies, multi-split air conditioning systems include a total refrigerant storage location, but the total refrigerant storage location is not shown in the relevant diagrams in this embodiment.

[0164] In one embodiment, when there are two or more indoor unit units, the refrigerant flow rate can be adjusted using an electronic expansion valve in conjunction with a refrigerant receiver tank. For example, a feedforward and feedback combined adjustment method can be used, utilizing the coil temperature of the indoor unit and the exhaust temperature of the outdoor unit condenser to adjust the opening degree. According to the air conditioning design concept, the exhaust temperature of the outdoor unit condenser is related to the coil temperature of the indoor unit and the operating frequency of the compressor.

[0165] In one embodiment, the adjustment time is set to T. M That is, when the compressor is turned on, every T M The time interval is used to calculate the exhaust temperature of the outdoor unit condenser. Different adjustment times can be set to calculate the exhaust temperature of multiple outdoor unit condensers, and then the average value is taken.

[0166] Let the opening degree of the electronic expansion valve be denoted as Fx, the coil temperature of the indoor unit be denoted as T2, and the exhaust temperature of the outdoor unit condenser be denoted as T. P0 T P0 The range of values ​​for PMV can be expressed as PMV. TRGTP_MIN_ADD ≤T P0 ≤PMV TRGTP_MAX_ADD Among them, PMV TRGTP_MIN_ADD and PMV TRGTP_MAX_ADD This represents the upper and lower temperature limits, both of which are integers and can be empirical values.

[0167] The relationship between the above three can be expressed as follows:

[0168] T P0 = aFx + b*T2 + c*(T3 - T) 30 )+d+T HZC

[0169] Among them, T HZC This indicates the compressor's operating frequency, 'a' represents the first coefficient, 'b' represents the second coefficient, 'c' represents the third coefficient, 'd' represents the fourth coefficient, and T3 represents the outdoor unit's condenser temperature. 30 This indicates a temperature limit.

[0170] In one embodiment, the limiting conditions for the above parameters are as follows:

[0171] The first coefficient 'a' has a range of values ​​[0, 2.55] and needs to be accurate to two decimal places.

[0172] The second coefficient b has a range of values ​​[0, 2.55], and needs to be accurate to the nearest whole number.

[0173] The value range of the third coefficient c is [-127, 127], and it needs to be accurate to the nearest whole number.

[0174] The fourth coefficient d is a constant, and its value range is [-127, 127].

[0175] Limiting temperature T 30 This represents the minimum outdoor unit condenser temperature T3 within a preset time period. For example, if the preset time period is (7-12 minutes), then T... 30 This indicates the minimum outdoor unit condenser temperature T3 within 7-12 minutes.

[0176] (T3-T 30 The value of ) cannot be greater than 0. It can be 0 or a negative number. If the calculated value is greater than 0, then this value is set to equal to 0.

[0177] In one embodiment, T2 can be the average of two adjustment cycles. This is done to prevent excessive changes in the calculation of the exhaust temperature of the outdoor unit condenser and to improve the accuracy of the calculation.

[0178] In one embodiment, the total refrigerant capacity stored in the refrigerant reservoir of each indoor unit is proportional to the sum of the internal volumes of the remaining indoor units. The internal volume of the indoor unit represents the required refrigerant capacity of that indoor unit, or its cooling capacity or corresponding air conditioning horsepower.

[0179] In one embodiment, if there are more than two indoor unit units, for example, five indoor unit units, since one to five indoor unit units may be turned on simultaneously, the total refrigerant storage capacity in the refrigerant reservoir of each indoor unit unit can be the sum of the refrigerant storage volumes of the indoor units in the other indoor unit units, or proportional to the sum of the refrigerant storage volumes of the indoor units in the other indoor unit units. The proportionality coefficient can be slightly less than 1, ensuring that the total capacity of the refrigerant reservoir of the indoor unit units in the turned-on state can accommodate excess refrigerant. At this time, the total refrigerant storage capacity in the refrigerant reservoir of the indoor unit unit may be much greater than the refrigerant demand of the corresponding indoor unit. Therefore, the refrigerant flow rate of the second refrigerant branch can be adjusted by controlling the opening degree of the corresponding electronic expansion valve, thereby ensuring that the refrigerant of the corresponding indoor unit is at an appropriate level.

[0180] In one embodiment, for example when there are two indoor unit units, the total capacity of refrigerant stored in the refrigerant reservoir is the same as the internal volume of the indoor unit in the other indoor unit (i.e., the proportionality coefficient is 1). In this case, the electronic expansion valve is removed, and only the refrigerant reservoir is used for refrigerant flow control, or the electronic expansion valve is used, but the opening degree of the electronic expansion valve is fully open.

[0181] like Figure 9 As shown, Figure 9 This is a flowchart of a control method for an air conditioning system provided in one embodiment of the present invention. This embodiment is illustrated using two indoor unit units as an example.

[0182] In this embodiment, the two indoor unit units are commonly known as a one-to-two air conditioning system. When the internal volume of the indoor units of the two indoor unit units is different, a refrigerant storage tank group with a different volume is embedded between the outdoor units of the indoor unit units.

[0183] refer to Figure 9There are four refrigerant flow paths between the outdoor unit, indoor unit 1, and indoor unit 2: the first refrigerant branch of indoor unit 1 (which includes valve 1), the second refrigerant branch of indoor unit 1 (which includes the second regulating switch 1 and refrigerant reservoir 1), the first refrigerant branch of indoor unit 2 (which includes valve 2), and the second refrigerant branch of indoor unit 2 (which includes the second regulating switch 2 and refrigerant reservoir 2). These four refrigerant flow paths are connected in parallel, and the refrigerant enters the corresponding indoor unit after passing through the parallel paths.

[0184] The states of indoor unit 1 are: S1 = 0 indicates the off state, and S1 = 1 indicates the on state. The states of indoor unit 2 are: S2 = 0 indicates the off state, and S2 = 1 indicates the on state.

[0185] refer to Figure 7 The process steps are as follows:

[0186] Step S2001: Obtain (or detect or receive) the operating status of the outdoor unit and two indoor unit units in the air conditioning system.

[0187] Step S2002: If the current operating status is determined to be: S1=1 and S2=1, that is, both indoor unit units are currently in the on state, then proceed to step S2003; otherwise, proceed to step S2004.

[0188] Step S2003: Open valve 1 and valve 2, and disconnect valve 1 and valve 2.

[0189] Step S2004: If the current operating status is determined to be: S1=1 and S2=0, that is, the current status of indoor unit 1 is on and indoor unit 2 is off, then proceed to step S2005; otherwise, proceed to step S2006.

[0190] Step S2005: Open the No. 1 second regulating switch and disconnect the No. 1 first valve, the No. 2 first valve and the No. 2 second regulating switch.

[0191] Step S2006: If the current operating status is determined to be: S1=0 and S2=1, that is, the current status of indoor unit No.2 is on and indoor unit No.1 is off, then proceed to step S2007; otherwise, proceed to step S2008.

[0192] Step S2007: Open the second regulating switch No. 2 to cut off the first valve No. 1, the second regulating switch No. 1, and the first valve No. 2.

[0193] Step S2008: Cut off No. 1 first valve, No. 1 second regulating switch, No. 2 first valve and No. 2 second regulating switch.

[0194] This invention incorporates an adjustment switch and a corresponding refrigerant receiver tank in the indoor unit. Based on the operating status of the indoor unit, the opening and closing of the refrigerant receiver tank is controlled via the adjustment switch. This allows for the regulation of the refrigerant flow in the indoor unit using the receiver tank, ensuring the system operates with a suitable refrigerant level. Furthermore, when there is a high refrigerant level, storing the excess refrigerant in the receiver tank further ensures that the refrigerant at the indoor unit outlet is in a gaseous state, improving the heat exchange efficiency of the indoor unit and reducing the risk of liquid refrigerant returning to the compressor, thus increasing system reliability.

[0195] Based on the above-described air conditioning system and its control method, various embodiments of the controller, air conditioning system, and computer-readable storage medium of the present invention are presented below.

[0196] In addition, one embodiment of the present invention provides a controller, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor.

[0197] The processor and memory can be connected via a bus or other means.

[0198] It should be noted that the controller in this embodiment can be applied to, for example... Figure 1 The system architecture platform shown in the embodiment, and the controller in this embodiment, can constitute... Figure 1 The system architecture platform shown in the embodiment is part of the same inventive concept, and therefore has the same implementation principle and beneficial effects, which will not be described in detail here.

[0199] The non-transient software program and instructions required to implement the air conditioning system control method of the above embodiments are stored in memory. When executed by a processor, the air conditioning system control method of the above embodiments is executed. For example, the above-described control method is executed. Figures 7 to 9 The methods and steps in the text.

[0200] Furthermore, one embodiment of the present invention also provides an air conditioning system, which includes the controller described in the above embodiment.

[0201] Furthermore, it is worth noting that since the air conditioning system of this embodiment includes the controller of the above embodiments, and the controller of the above embodiments can execute the control method of the air conditioning system of any of the above embodiments, the specific implementation method and technical effects of the air conditioning system of this embodiment can be referred to the specific implementation method and technical effects of the control method of the air conditioning system of any of the above embodiments.

[0202] It is understood that the air conditioning system in this embodiment of the invention also includes, but is not limited to, a main air conditioner, which communicates with the controller.

[0203] Furthermore, one embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions for performing the aforementioned control method for an air conditioning system. Exemplarily, the above-described method is executed... Figures 7 to 9 The methods and steps in the text.

[0204] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically include computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0205] The above provides a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present invention.

Claims

1. An air conditioning system, characterized in that, include: Outdoor unit; At least two indoor unit units are connected in parallel, and the indoor unit units are connected to the outdoor unit through the main system piping; The indoor unit includes: Indoor unit; The first refrigerant branch is connected between the indoor unit and the outdoor unit. The first refrigerant branch includes a first valve, which is used to control the on / off state of the first refrigerant branch. The second refrigerant branch is connected between the indoor unit and the outdoor unit. The second refrigerant branch includes a second regulating switch and a refrigerant storage tank assembly. The refrigerant storage tank assembly is used to store the refrigerant flowing through the second refrigerant branch, and the second regulating switch is used to regulate the refrigerant flow rate of the second refrigerant branch. The controller is communicatively connected to at least two of the indoor unit units. The controller is used to control the opening and closing of the corresponding first valve or second regulating switch according to the operating status of the at least two indoor unit units, so as to regulate the refrigerant flow of the corresponding indoor unit unit. The operating states of the indoor unit include: an on state and a off state. The controller is specifically used for: when all indoor unit units are on, opening the first valve of each indoor unit and shutting off the second regulating switch of that indoor unit; when some indoor unit units are on and the rest are off, regulating the second regulating switch of the indoor unit units that are on; when there are two indoor unit units, the second regulating switch includes a second valve for controlling the on / off state of the second refrigerant branch, and opening the second valve; when there are more than two indoor unit units, the second regulating switch includes: a second valve for controlling the on / off state of the second refrigerant branch and an electronic expansion valve for regulating the refrigerant flow rate from the refrigerant storage tank group, opening the second valve and controlling the opening degree of the electronic expansion valve to regulate the refrigerant flow rate of the second refrigerant branch, shutting off the first valve, and simultaneously disconnecting the first valve and second regulating switch of the indoor unit units that are off; when all indoor unit units are off, shutting off the first valve and second regulating switch of each indoor unit unit.

2. The air conditioning system according to claim 1, characterized in that, The controller is communicatively connected to the outdoor unit. The controller generates a control signal based on the coil temperature of the indoor unit and the exhaust temperature of the outdoor unit to control the opening degree of the electronic expansion valve.

3. The air conditioning system according to any one of claims 1 to 2, characterized in that, The refrigerant storage tank group includes: one refrigerant storage tank, or two or more refrigerant storage tanks connected in series, or one or more refrigerant storage tanks connected in parallel.

4. The air conditioning system according to claim 3, characterized in that, The total capacity of the refrigerant storage tank group is proportional to the sum of the internal volumes of the remaining indoor unit units.

5. A control method for an air conditioning system, characterized in that, A controller is applied to the air conditioning system, which includes an outdoor unit and at least two indoor unit units connected in parallel. The indoor unit units are connected to the outdoor unit via a main system pipeline. Each indoor unit unit includes an indoor unit, a first refrigerant branch, and a second refrigerant branch. The first refrigerant branch includes a first valve, one end of which is connected to the main system pipeline, and the other end is connected to the indoor unit. The second refrigerant branch includes a second regulating switch and a refrigerant reservoir assembly. The refrigerant reservoir assembly stores the refrigerant flowing through the second refrigerant branch, and the second regulating switch regulates the refrigerant flow rate in the second refrigerant branch. The controller is communicatively connected to at least two of the indoor unit units. The control method includes: Obtain the operating status of at least two indoor unit units; Based on the operating status of at least two of the indoor unit units, the opening and closing of the corresponding first valve and second regulating switch are controlled to regulate the refrigerant flow of the corresponding indoor unit unit; The operating states of the indoor unit include: an on state and a off state. The step of controlling the opening and closing of the corresponding first valve and second regulating switch based on the operating states of at least two indoor unit units to regulate the refrigerant flow of the corresponding indoor unit includes: When all indoor unit units are in the on state, open the first valve of each indoor unit unit and cut off the second regulating switch of the indoor unit unit; When some indoor unit units are in the on state and the rest of the indoor unit units are in the off state, adjust the second regulating switch of the indoor unit in the on state to adjust the refrigerant flow of the second refrigerant branch, cut off the first valve, and at the same time disconnect the first valve and the second regulating switch of the indoor unit in the off state. When all indoor unit units are in the off state, the first valve and the second regulating switch of each indoor unit unit are shut off; When there are two indoor unit units, the second regulating switch includes a second valve. The second regulating switch of the indoor unit unit in the open state includes: opening the second valve. When there are more than two indoor unit units, the second regulating switch includes a second valve and an electronic expansion valve. The second regulating switch of the indoor unit unit in the open state includes: opening the second valve and controlling the opening degree of the electronic expansion valve.

6. The control method for an air conditioning system according to claim 5, characterized in that, The controller is communicatively connected to the outdoor unit and further includes: A control signal is generated based on the coil temperature of the indoor unit and the exhaust temperature of the outdoor unit to control the opening degree of the electronic expansion valve.

7. The control method for an air conditioning system according to any one of claims 5 to 6, characterized in that, The refrigerant storage tank group includes: one refrigerant storage tank, or one or more refrigerant storage tanks connected in series, or one or more refrigerant storage tanks connected in parallel.

8. The control method for the air conditioning system according to claims 7 to 1, characterized in that, The total capacity of the refrigerant storage tank group is proportional to the sum of the internal volumes of the remaining indoor unit units.

9. A controller, characterized in that, include: The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the control method for the air conditioning system as described in any one of claims 5 to 8.

10. An air conditioning system, characterized in that, Includes the controller as described in claim 9.

11. A computer-readable storage medium, characterized in that, The device stores computer-executable instructions for performing the control method as described in any one of claims 5 to 8.

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