Ultra-low temperature refrigeration control method, device, equipment and medium for multi-connected air conditioning system

Abstract

The present application relates to a method, device, computer equipment, storage medium and computer program product for ultra-low temperature refrigeration control of a multi-connected air conditioning system. The method includes: when the outdoor ambient temperature of the multi-connected air conditioning system is less than a first preset ambient temperature, obtaining the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-connected air conditioning system; if the total capacity of the heating indoor units is less than the total capacity of the cooling indoor units, determining a target heat exchange indoor unit from the idle indoor units in the multi-connected air conditioning system; controlling the target heat exchange indoor unit to operate in the heating mode to condense and release heat from the refrigerant discharged by the compressor. By adopting this method, it is possible to effectively avoid the indoor units from frequently entering the anti-freezing protection and improve the user experience.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and particularly to a method, device, computer device, storage medium, and computer program product for ultra-low temperature refrigeration control of a multi-connected air conditioner system. Background Art

[0002] When users use air conditioning equipment, due to different regions and climates, the requirements for air conditioners are also different. In some regions, the outdoor ambient temperature in winter can reach ultra-low temperatures below -10°C, but there may still be a need for refrigeration in some special rooms (such as equipment rooms, kitchens, etc.).

[0003] In the refrigeration mode of the air conditioner system, the outdoor heat exchanger is used as a condenser. The high-temperature and high-pressure refrigerant discharged from the compressor needs to be condensed and released heat in the outdoor heat exchanger, and then enters the indoor heat exchanger for evaporation after throttling and pressure reduction. In the case of too low outdoor ambient temperature, the indoor heat exchanger operating at low temperature for a long time may freeze or ice up, causing the indoor unit to frequently start the anti-freezing protection, which affects the user experience. Summary of the Invention

[0004] Based on this, in view of the above technical problems, it is necessary to provide a method, device, computer device, computer-readable storage medium, and computer program product for ultra-low temperature refrigeration control of a multi-connected air conditioner system that can avoid the indoor unit frequently entering the anti-freezing protection and improve the user experience.

[0005] In a first aspect, the present application provides a method for ultra-low temperature refrigeration control of a multi-connected air conditioner system, the method comprising:

[0006] When the outdoor ambient temperature of the multi-connected air conditioner system is less than a first preset ambient temperature, obtain the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-connected air conditioner system;

[0007] If the total capacity of the heating indoor units is less than the total capacity of the cooling indoor units, determine a target heat exchange indoor unit from the idle indoor units in the multi-connected air conditioner system;

[0008] Control the target heat exchange indoor unit to operate in the heating mode to condense and release heat from the refrigerant discharged by the compressor.

[0009] In one embodiment, the determining a target heat exchange indoor unit from the idle indoor units in the multi-connected air conditioner system includes:

[0010] Obtain the indoor ambient temperature of each idle indoor unit in the multi-connected air conditioner system;

[0011] Use the idle indoor unit with an indoor ambient temperature less than a second preset ambient temperature as the target heat exchange indoor unit.

[0012] In one embodiment, determining a target heat exchange indoor unit from the idle indoor units of the multi-connected air conditioning system includes:

[0013] Determining a target heat exchange indoor unit from the idle indoor units of the multi-connected air conditioning system according to available tags; the available tags are preset based on the importance of the room.

[0014] In one embodiment, determining a target heat exchange indoor unit from the idle indoor units of the multi-connected air conditioning system according to available tags includes:

[0015] Obtaining the idle indoor units of the multi-connected air conditioning system;

[0016] Determining, from each of the idle indoor units, an idle indoor unit that has the available tag and whose indoor environmental temperature is less than a second preset environmental temperature as the target heat exchange indoor unit.

[0017] In one embodiment, if there are multiple target heat exchange indoor units, controlling the target heat exchange indoor units to operate in a heating mode and condensing and releasing heat from the refrigerant discharged by the compressor includes:

[0018] Sorting each of the target heat exchange indoor units in ascending order according to the indoor environmental temperature of the target heat exchange indoor unit to obtain a target heat exchange indoor unit sequence;

[0019] Based on the capacity difference between the total capacity of the heating indoor units and the total capacity of the cooling indoor units, and the heating capacity of each of the target heat exchange indoor units in the target heat exchange indoor unit sequence, determining the number of target heat exchange indoor units that need to be turned on;

[0020] Controlling the target heat exchange indoor units with earlier sorting in the target heat exchange indoor unit sequence to operate in a heating mode and condensing and releasing heat from the refrigerant discharged by the compressor;

[0021] Until the number of target heat exchange indoor units turned on in the target heat exchange indoor unit sequence is equal to the number of target heat exchange indoor units that need to be turned on, controlling the multi-connected air conditioning system to enter a full heat recovery mode.

[0022] In one embodiment, the method further includes:

[0023] After running for a preset duration, returning to the step of obtaining the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-connected air conditioning system.

[0024] In one embodiment, after the step of controlling the target heat exchange indoor units to operate in a heating mode and condensing and releasing heat from the refrigerant discharged by the compressor, it further includes:

[0025] When the indoor environmental temperature of the target heat exchange indoor unit operating in the heating mode is greater than the second preset environmental temperature, control the target heat exchange indoor unit to stop operating in the heating mode, and return to the step of obtaining the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-connected air conditioning system.

[0026] In one embodiment, controlling the target heat exchange indoor unit to operate in the heating mode includes:

[0027] Control the electronic expansion valve of the target heat exchange indoor unit to open, the blower to operate at a preset gear, the heating solenoid valve of the corresponding mode converter to open, and the cooling solenoid valve of the mode converter to close.

[0028] In a second aspect, the present application also provides a multi-connected air conditioning system ultra-low temperature refrigeration control device, and the device includes:

[0029] A capacity acquisition module, configured to obtain the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-connected air conditioning system when the outdoor environmental temperature of the multi-connected air conditioning system is less than the first preset environmental temperature;

[0030] A target heat exchange indoor unit determination module, configured to determine a target heat exchange indoor unit from the idle indoor units of the multi-connected air conditioning system if the total capacity of the heating indoor units is less than the total capacity of the cooling indoor units;

[0031] A control module, configured to control the target heat exchange indoor unit to operate in the heating mode and condense and release heat from the refrigerant discharged by the compressor.

[0032] In a third aspect, the present application also provides a computer device, including a memory and a processor, where the memory stores a computer program, and when the processor executes the computer program, the steps of the above method are implemented.

[0033] In a fourth aspect, the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0034] In a fifth aspect, the present application also provides a computer program product, including a computer program, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0035] The above multi-split air conditioning system ultra-low temperature refrigeration control method, device, computer equipment, storage medium and computer program product, when the outdoor ambient temperature of the multi-split air conditioning system is less than the first preset ambient temperature, at this time the outdoor environment of the multi-split air conditioning system is in an ultra-low temperature environment. Obtain the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-split air conditioning system. If the total capacity of the heating indoor units is less than the total capacity of the cooling indoor units, it means that the heating indoor units in the multi-split air conditioning system cannot meet the cooling requirements of the cooling indoor units. At least a part of the refrigerant flowing through the cooling indoor units in the current multi-split air conditioning system comes from the outdoor unit heat exchanger, which is likely to cause the indoor units to frequently start the anti-freezing protection. Determine the target heat exchange indoor unit from the idle indoor units of the multi-split air conditioning system, control the target heat exchange indoor unit to operate in the heating mode, and condense and release heat from the refrigerant discharged by the compressor in the multi-split air conditioning system, so that the refrigerant flowing through the cooling indoor units does not pass through the outdoor heat exchanger in the ultra-low temperature environment, which can effectively avoid the indoor units from frequently entering the anti-freezing protection and improve the user experience. Description of the Drawings

[0036] Figure 1 It is an application environment diagram of the multi-split air conditioning system ultra-low temperature refrigeration control method in an embodiment;

[0037] Figure 2 It is a schematic flowchart of the multi-split air conditioning system ultra-low temperature refrigeration control method in an embodiment;

[0038] Figure 3 It is a schematic flowchart of the step of controlling the target heat exchange indoor unit to operate in the heating mode and condensing and releasing heat from the refrigerant discharged by the compressor in an embodiment;

[0039] Figure 4 It is a schematic diagram of the refrigerant flow direction of the multi-split air conditioning system operating in the full cooling mode in an embodiment;

[0040] Figure 5 It is a schematic diagram of the refrigerant flow direction of the multi-split air conditioning system operating in the main body cooling mode in an embodiment;

[0041] Figure 6 It is a schematic diagram of the refrigerant flow direction of the multi-split air conditioning system operating in the full heat recovery mode in an embodiment;

[0042] Figure 7 It is a schematic flowchart of the step of controlling the target heat exchange indoor unit to operate in the heating mode and condensing and releasing heat from the refrigerant discharged by the compressor in another embodiment;

[0043] Figure 8 It is a schematic flowchart of the multi-split air conditioning system ultra-low temperature refrigeration control method in another embodiment;

[0044] Figure 9 The structural block diagram of the ultra-low temperature refrigeration control device for a multi-connected air-conditioning system in an embodiment;

[0045] Figure 10 The internal structure diagram of a computer device in an embodiment. Detailed implementation manners

[0046] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0047] The ultra-low temperature refrigeration control method for a multi-connected air-conditioning system provided by the embodiment of the present application can be applied to an application environment as Figure 1 shown. Among them, the multi-connected air-conditioning system includes a plurality of indoor units 101 on the indoor side and an outdoor unit 102 on the outdoor side. Both the outdoor unit 102 and the plurality of indoor units 101 can be controlled by a controller 103. The outdoor unit 102 includes a compressor 1021, an outdoor heat exchanger 1022, a heating electronic expansion valve 1023, a heating four-way valve 1024, a refrigeration main four-way valve 1025, and a pipe for connecting with the indoor unit 101. Each indoor unit 101 is configured with a corresponding mode converter 104.

[0048] The controller 103 is connected to each device in the multi-connected air-conditioning system for control. The data storage system can store the data that the controller 103 needs to process. The data storage system can be integrated on the controller 103, or can be placed in the cloud or other network servers. The controller 103 obtains the outdoor environmental temperature of the multi-connected air-conditioning system. When the outdoor environmental temperature where the multi-connected air-conditioning system is located is less than the first preset environmental temperature, it obtains the total capacity of the heating indoor units operating in the heating mode and the total capacity of the refrigeration indoor units operating in the refrigeration mode in the multi-connected air-conditioning system. If the total capacity of the heating indoor units is less than the total capacity of the refrigeration indoor units, it determines a target heat exchange indoor unit from the idle indoor units 101 of the multi-connected air-conditioning system, and controls the target heat exchange indoor unit to operate in the heating mode to condense and release heat from the refrigerant output by the compressor 1021. Among them, the controller 102 can be any control chip with logical processing ability.

[0049] In one embodiment, as Figure 2 shown, an ultra-low temperature refrigeration control method for a multi-connected air-conditioning system is provided. Taking the method applied to the Figure 1 controller as an example, the method includes the following steps:

[0050] Step 202: When the outdoor ambient temperature of the multi-split air conditioning system is lower than the first preset ambient temperature, obtain the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-split air conditioning system.

[0051] Among them, the multi-split air conditioning system refers to an air conditioning system composed of one or more outdoor units connected to two or more indoor units through pipes. The indoor units in the multi-split air conditioning system can be in the heating mode operation state, the cooling mode operation state, and the idle state according to the user's needs.

[0052] The outdoor ambient temperature of the multi-split air conditioning system is the ambient temperature of the environment where the outdoor unit is located in the multi-split air conditioning system. The outdoor ambient temperature can be obtained by real-time collection through a temperature sensor set on the outdoor side, or determined by the controller obtaining the weather information of the geographical location where the multi-split air conditioning system is located.

[0053] The first preset ambient temperature is the temperature used to characterize whether the current outdoor ambient temperature meets the ultra-low temperature cooling operation conditions. The first preset ambient temperature can be determined according to the empirical temperature value at which the indoor unit heat exchanger in the multi-split air conditioning system triggers freeze protection in the ultra-low temperature cooling environment.

[0054] The total capacity of the heating indoor units refers to the total capacity of the indoor units operating in the heating mode in the multi-split air conditioning system, which can characterize the heating capacity of the multi-split air conditioning system, that is, the size of the heating demand of the multi-split air conditioning system. The total capacity of the cooling indoor units refers to the total capacity of the indoor units operating in the cooling mode in the multi-split air conditioning system, which can characterize the cooling capacity of the multi-split air conditioning system, that is, the size of the cooling demand of the multi-split air conditioning system.

[0055] It can be understood that the total capacity of the heating indoor units and the total capacity of the cooling indoor units in the multi-split air conditioning system can be determined according to the number of indoor units operating in the heating mode and the number of indoor units operating in the cooling mode, or can be determined according to the air conditioner horsepower of the indoor units operating in the heating mode and the indoor units operating in the cooling mode.

[0056] For example, when the brands, electronic control designs, and equipment parameters of the indoor units in the multi-split air conditioning system are the same, the total capacity of the heating indoor units in the multi-split air conditioning system can be determined according to the number of indoor units operating in the heating mode, and the total capacity of the cooling indoor units in the multi-split air conditioning system can be determined according to the number of indoor units operating in the cooling mode.

[0057] When the brands, electronic control designs, and equipment parameters of the indoor units in the multi-split air conditioning system are different, the controller determines the total capacity of the heating indoor units in the multi-split air conditioning system according to the air conditioner horsepower of the indoor units operating in the heating mode, and determines the total capacity of the cooling indoor units in the multi-split air conditioning system according to the air conditioner horsepower of the indoor units operating in the cooling mode.

[0058] Specifically, the controller obtains the outdoor ambient temperature of the multi-connected air-conditioning system. If the outdoor ambient temperature is lower than the first preset ambient temperature, the outdoor environment of the multi-connected air-conditioning system is in an ultra-low temperature environment at this time, and there is a risk of frequent triggering of the anti-freezing protection. The controller obtains the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the current multi-connected air-conditioning system.

[0059] Step 204: If the total capacity of the heating indoor units is less than the total capacity of the cooling indoor units, determine the target heat exchange indoor unit from the idle indoor units of the multi-connected air-conditioning system.

[0060] Among them, the idle indoor unit is the indoor unit in the multi-connected air-conditioning system that is in an idle state, that is, the indoor unit in the multi-connected air-conditioning system that is in a shutdown state. The controller can determine the idle indoor units in the current multi-connected air-conditioning system according to the operating states of the indoor units in the multi-connected air-conditioning system. The target heat exchange indoor unit is the idle indoor unit that serves as a condenser on the indoor side. Using the idle indoor unit as the indoor condenser allows the high-temperature and high-pressure refrigerant to bypass the outdoor ultra-low temperature environment and directly enter the indoor side, increasing the pipe temperature of the cooling indoor unit and preventing the cooling indoor unit from triggering the anti-freezing protection due to too low pipe temperature.

[0061] Specifically, the controller compares the total capacity of the heating indoor units with the total capacity of the cooling indoor units. If the total capacity of the heating indoor units is less than the total capacity of the cooling indoor units, it indicates that there are cooling indoor units operating in the cooling mode in the multi-connected air-conditioning system at this time. The multi-connected air-conditioning system meets the ultra-low temperature cooling operation conditions, and the heating indoor units in the multi-connected air-conditioning system cannot meet the cooling requirements of the cooling indoor units. At least part of the refrigerant flowing through the cooling indoor units in the multi-connected air-conditioning system comes from the outdoor unit heat exchanger. Under the influence of the outdoor ultra-low temperature environment, the refrigerant flowing through the cooling indoor units easily causes the indoor units to frequently trigger the anti-freezing protection. The controller determines the target heat exchange indoor unit from the idle indoor units in the multi-connected air-conditioning system that are in an idle state.

[0062] Step 206: Control the target heat exchange indoor unit to operate in the heating mode to condense and release heat from the refrigerant discharged by the compressor.

[0063] Specifically, the controller controls the target heat exchange indoor unit to operate in the heating mode to condense and release heat from the refrigerant discharged by the compressor in the multi-connected air-conditioning system. After the high-temperature and high-pressure refrigerant discharged by the compressor is discharged from the compressor, it directly enters the indoor side, passes through the mode heat exchanger corresponding to the target heat exchange indoor unit, and enters the heat exchanger of the target heat exchange indoor unit to condense and release heat. The condensed refrigerant then enters the heat exchanger of the cooling indoor unit through the liquid pipe through the mode heat exchanger of the cooling indoor unit to evaporate and absorb heat, completing the refrigeration.

[0064] In the above ultra-low temperature refrigeration control method for a multi-connected air conditioning system, when the outdoor ambient temperature of the multi-connected air conditioning system is less than the first preset ambient temperature, the outdoor environment of the multi-connected air conditioning system is in an ultra-low temperature environment at this time. Obtain the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-connected air conditioning system. If the total capacity of the heating indoor units is less than the total capacity of the cooling indoor units, it means that the heating indoor units in the multi-connected air conditioning system cannot meet the cooling requirements of the cooling indoor units. At least a part of the refrigerant flowing through the cooling indoor units in the current multi-connected air conditioning system comes from the outdoor heat exchanger, which easily causes the indoor units to frequently start the anti-freezing protection. Determine the target heat exchange indoor unit from the idle indoor units of the multi-connected air conditioning system, control the target heat exchange indoor unit to operate in the heating mode, and condense and release heat from the high-temperature and high-pressure refrigerant discharged by the compressor in the multi-connected air conditioning system, so that the refrigerant flowing through the cooling indoor units does not need to pass through the outdoor heat exchanger in the ultra-low temperature environment, which can effectively avoid the indoor units from frequently entering the anti-freezing protection and improve the user experience.

[0065] Further, in one embodiment, controlling the target heat exchange indoor unit to operate in the heating mode includes: controlling the electronic expansion valve of the target heat exchange indoor unit to open, the fan to operate at a preset gear, the heating solenoid valve of the corresponding mode converter to open, and the cooling solenoid valve of the mode converter to close.

[0066] Among them, the preset gear of the fan is the operating gear of the corresponding fan when controlling the target heat exchange indoor unit to operate in the heating mode. Since the target heat exchange indoor unit is an idle indoor unit, the indoor environment where the target heat exchange indoor unit is located originally does not require heating or cooling. Therefore, when controlling the target heat exchange indoor unit to operate in the heating mode, the operating gear of the fan cannot be too high. If the operating gear of the fan is too high, it will have a greater impact on the indoor environment temperature where the target heat exchange indoor unit is located. The designer pre-sets the operating gear of the fan according to the actual needs of the user and / or the impact of the target heat exchange indoor unit operating in the heating mode on the indoor environment temperature. When the fan operates at the preset gear, the impact on the indoor environment temperature where the target heat exchange indoor unit is located can be reduced.

[0067] In one embodiment, the preset gear of the fan is the lowest gear.

[0068] Specifically, after the controller determines the target heat exchange indoor unit from the idle indoor units of the multi-connected air conditioning system, it controls the electronic expansion valve of the target heat exchange indoor unit to open, thereby turning on the target heat exchange indoor unit, controls the corresponding fan of the target heat exchange indoor unit to operate at a preset gear, and the corresponding mode converter turns on the heating solenoid valve and closes the cooling solenoid valve. By controlling the target heat exchange indoor unit to operate in the heating mode, the controller can make the refrigerant flowing through the cooling indoor units not pass through the outdoor heat exchanger in the ultra-low temperature environment, which can effectively avoid the indoor units from frequently entering the anti-freezing protection and improve the user experience.

[0069] Since controlling the target heat exchange indoor unit to operate in the heating mode will more or less affect the indoor environmental temperature of the room where the target heat exchange indoor unit is located, in one embodiment, determining the target heat exchange indoor unit from the idle indoor units of the multi-connected air conditioning system includes: obtaining the indoor environmental temperature of each idle indoor unit in the multi-connected air conditioning system; using the idle indoor unit with the indoor environmental temperature less than the second preset environmental temperature as the target heat exchange indoor unit.

[0070] Wherein, the second preset environmental temperature is used to characterize the temperature threshold of whether the indoor environment of the idle indoor unit in the idle state will affect the user experience, and the value of the second preset environmental temperature is determined by the designer according to the empirical temperature data affecting the user experience. For example, if the designer determines the temperature threshold affecting the user experience as 26 degrees according to the empirical temperature data, 26 degrees can be determined as the second preset environmental temperature.

[0071] Specifically, the controller obtains the indoor environmental temperature of each idle indoor unit in the multi-connected air conditioning system, compares each indoor environmental temperature with the second preset environmental temperature. If the indoor environmental temperature is not less than the second preset environmental temperature, it means that if the idle indoor unit is controlled to operate in the heating mode at this time, it is likely to cause the indoor environmental temperature of the idle indoor unit to continue to increase, causing discomfort to the user and affecting the user experience. If the indoor environmental temperature is less than the second preset environmental temperature, it means that there is still an adjustable range for the indoor environmental temperature of the idle indoor unit. Controlling the idle indoor unit to operate in the heating mode within the adjustable range will not cause discomfort to the user even if the indoor environmental temperature rises slightly.

[0072] Therefore, the controller determines the idle indoor unit with the indoor environmental temperature less than the second preset environmental temperature as the target heat exchange indoor unit, which can effectively avoid the situation that the indoor environmental temperature of the target heat exchange indoor unit increases due to controlling the target heat exchange indoor unit to operate in the heating mode, causing discomfort to the user, and improving the user experience.

[0073] In order to better meet the user's usage requirements, in one embodiment, determining the target heat exchange indoor unit from the idle indoor units of the multi-connected air conditioning system includes: determining the target heat exchange indoor unit from the idle indoor units of the multi-connected air conditioning system according to the available tags; the available tags are preset based on the importance of the room.

[0074] Among them, the available tag is used to mark the available idle indoor unit. The available tag can be preset based on the importance of the room, and the importance of the room can be determined according to the actual needs of the user. The user can determine the importance of the room according to the demand for the temperature stability of the room. For example, the user can set the important room with the highest temperature stability in the room, such as the key conference room, etc., as the VIP room, and set the available tag for the indoor units configured in the non-VIP rooms. When the indoor unit in the non-VIP room is in an idle state, the indoor unit is the available idle indoor unit.

[0075] Specifically, after the controller determines the idle indoor units in the multi-split air-conditioning system according to the operating states of the indoor units in the multi-split air-conditioning system, the available idle indoor units with available tags set in the idle indoor units are determined as the target heat exchange indoor units.

[0076] In this embodiment, available tags are set for each indoor unit according to the importance of the room. The controller determines the target heat exchange indoor unit from the idle indoor units of the multi-split air-conditioning system according to the available tags. By setting available tags for the indoor units according to the importance of the room, it can effectively avoid the situation that when the multi-split air-conditioning system meets the ultra-low temperature refrigeration operating conditions, the idle indoor unit in the important room is determined as the target heat exchange indoor unit and the heating mode is operated, resulting in fluctuations in the temperature in the important room, and improving the user experience.

[0077] Further, in one embodiment, determining the target heat exchange indoor unit from the idle indoor units of the multi-split air-conditioning system according to the available tag includes: obtaining the idle indoor units of the multi-split air-conditioning system; determining, from each of the idle indoor units, the idle indoor units that have available tags and the indoor environment temperature of the idle indoor unit is less than the second preset environment temperature as the target heat exchange indoor units.

[0078] Specifically, the controller obtains the idle indoor units of the multi-split air-conditioning system, determines the idle indoor units with available tags set from each of the idle indoor units as the available idle indoor units, obtains the indoor environment temperature of each available idle indoor unit, and uses the available idle indoor units with the indoor environment temperature less than the second preset environment temperature as the target heat exchange indoor units.

[0079] In this embodiment, the idle indoor units that have both available tags and meet the temperature conditions are determined as the target heat exchange indoor units, which not only meets the user's usage requirements but also takes into account the user's usage feelings, and further improves the user experience.

[0080] When there are multiple target heat exchange indoor units that meet the requirements in the multi-split air-conditioning system, in one embodiment, as Figure 3 shown, controlling the target heat exchange indoor unit to operate in the heating mode, and the refrigerant discharged from the compressor undergoes condensation heat release, including the following steps:

[0081] Step 302: Sort the target heat exchange indoor units in ascending order according to the indoor environmental temperature of the target heat exchange indoor units to obtain a target heat exchange indoor unit sequence.

[0082] Specifically, the controller arranges the target heat exchange indoor units in ascending order according to the indoor environmental temperature of the target heat exchange indoor units to obtain a target heat exchange indoor unit sequence. The target heat exchange indoor units in the target heat exchange indoor unit sequence are arranged in ascending order of indoor temperature.

[0083] Step 304: Based on the capacity difference between the total capacity of the heating indoor units and the total capacity of the cooling indoor units, and the heating capacities of the target heat exchange indoor units in the target heat exchange indoor unit sequence, determine the number of target heat exchange indoor units to be turned on.

[0084] Specifically, the controller calculates the difference between the total capacity of the heating indoor units and the total capacity of the cooling indoor units to obtain the capacity difference between the total capacity of the heating indoor units and the total capacity of the cooling indoor units. Based on the capacity difference and the heating capacities of the target heat exchange indoor units in the target heat exchange indoor unit sequence, determine the number of target heat exchange indoor units to be turned on.

[0085] It can be understood that when determining the number of target heat exchange indoor units to be turned on, starting from the first target heat exchange indoor unit in the target heat exchange indoor unit sequence, successively calculate the number of target heat exchange indoor units to be turned on according to the heating capacities of the target heat exchange indoor units in the target heat exchange indoor unit sequence.

[0086] Step 306: Control the target heat exchange indoor units with earlier sorting in the target heat exchange indoor unit sequence to operate in the heating mode to condense and release heat from the refrigerant discharged by the compressor.

[0087] Specifically, the controller controls the target heat exchange indoor units with earlier sorting in the target heat exchange indoor unit sequence to operate in the heating mode to condense and release heat from the refrigerant discharged by the compressor.

[0088] Step 308: When the number of target heat exchange indoor units turned on in the target heat exchange indoor unit sequence is equal to the number of target heat exchange indoor units to be turned on, control the multi-split air-conditioning system to enter the full heat recovery mode.

[0089] Among them, if the indoor units in the multi-split air-conditioning system only operate in the cooling mode and there is no indoor unit operating in the heating mode, then at this time the multi-split air-conditioning system is in the full cooling mode, and the refrigerant flow direction in the full cooling mode is as Figure 4As shown in the figure, the refrigerant at high temperature and high pressure is discharged from the compressor. Since there is no indoor unit operating in the heating mode, all the refrigerant flows into the outdoor heat exchanger through the refrigeration main four-way valve for condensation. After condensation, the refrigerant converges into the liquid pipe and then passes through the mode converter corresponding to the refrigeration indoor unit to evaporate and absorb heat in the heat exchanger of the refrigeration indoor unit. Then it converges into the low-pressure organ, enters the gas-liquid separator and finally returns to the compressor to complete the entire cycle.

[0090] If there are both heating indoor units operating in the heating mode and refrigeration indoor units operating in the refrigeration mode in a multi-connected air-conditioning system, the multi-connected air-conditioning system will have the following two operating modes.

[0091] First, the main body refrigeration mode. The main body refrigeration mode is generally the operating mode selected by the multi-connected air-conditioning system when the total capacity of the heating indoor units is less than the total capacity of the refrigeration indoor units. At this time, although there are both heating indoor units or target heat exchange indoor units operating in the heating mode and refrigeration indoor units operating in the refrigeration mode in the multi-connected air-conditioning system, the total capacity of the heating indoor units and the target heat exchange indoor units is less than the total capacity of the refrigeration indoor units. The heating indoor units and the target heat exchange indoor units in the multi-connected air-conditioning system cannot meet the refrigeration demand of the refrigeration indoor units, and the multi-connected air-conditioning system will operate in the main body refrigeration mode.

[0092] The refrigerant flow direction in the main body refrigeration mode is as Figure 5 shown. The refrigerant at high temperature and high pressure is discharged from the compressor. A part passes through the refrigeration four-way valve and enters the outdoor heat exchanger for condensation and heat release, then passes through the heating electronic expansion valve and enters the liquid pipe; another part passes through the heating four-way valve and the high-pressure gas pipe and enters the indoor side, then passes through the mode converter and enters the heat exchanger of the heating indoor unit or the target heat exchange indoor unit for condensation and heat release, and then enters the liquid pipe. After these two parts of the refrigerant converge in the liquid pipe, they pass through the mode converter corresponding to the refrigeration indoor unit and enter the heat exchanger of the refrigeration indoor unit to evaporate and absorb heat, then converge into the low-pressure gas pipe, enter the gas-liquid separator and finally return to the compressor to complete the entire cycle.

[0093] Second, the full heat recovery mode. The full heat recovery mode is generally the operating mode selected by the multi-connected air-conditioning system when the total capacity of the heating indoor units is not less than the total capacity of the refrigeration indoor units. At this time, there are both heating indoor units or target heat exchange indoor units operating in the heating mode and refrigeration indoor units operating in the refrigeration mode in the multi-connected air-conditioning system, and the total capacity of the heating indoor units and the target heat exchange indoor units is not less than the total capacity of the refrigeration indoor units. The heating indoor units and the target heat exchange indoor units in the multi-connected air-conditioning system can meet the refrigeration demand of the refrigeration indoor units, and there is no need for the outdoor heat exchanger on the outdoor side to condense and release heat to the refrigerant. The multi-connected air-conditioning system will operate in the full heat recovery mode.

[0094] The refrigerant flow direction in the full heat recovery mode is as Figure 6As shown, the refrigerant at high temperature and high pressure is discharged from the compressor, all passing through the heating four-way valve and the high-pressure gas pipe into the indoor side, then through the mode converter into the target heat exchange indoor unit heat exchanger and / or the heating indoor unit heat exchanger for condensation and heat release. The condensed refrigerant then converges into the liquid pipe and enters the refrigeration indoor unit heat exchanger through the mode converter for evaporation and heat absorption, and then converges into the low-pressure gas pipe, enters the gas-liquid separator and finally returns to the compressor to complete the entire cycle.

[0095] Specifically, since the number of target heat exchange indoor units to be turned on is calculated based on the capacity difference and the heating capacity of each target heat exchange indoor unit in the target heat exchange indoor unit sequence, when the number of target heat exchange indoor units turned on by the controller is equal to the number of target heat exchange indoor units to be turned on, it can be considered that the total heating capacity of the heating indoor units in the multi-split air-conditioning system is not less than the total cooling capacity of the refrigeration indoor units at this time. At this time, the heating indoor units and the target heat exchange indoor units in the multi-split air-conditioning system can meet the cooling demand of the refrigeration indoor units, and there is no need for the outdoor heat exchanger on the outdoor side to condense and release heat for the refrigerant. The multi-split air-conditioning system will operate in the full heat recovery mode, and the controller controls the current multi-split air-conditioning system to continuously operate in the full heat recovery mode.

[0096] In this embodiment, the controller calculates the difference between the total heating capacity of the heating indoor units and the total cooling capacity of the refrigeration indoor units to obtain the capacity difference between the total heating capacity of the heating indoor units and the total cooling capacity of the refrigeration indoor units. Based on the capacity difference and the heating capacity of each target heat exchange indoor unit in the target heat exchange indoor unit sequence, the number of target heat exchange indoor units to be turned on is determined. By turning on the target indoor heat exchangers with the number equal to the number of target heat exchange indoor units to be turned on and ranked in the front from the target heat exchange indoor unit sequence, the multi-split air-conditioning unit can be precisely controlled to operate in the full heat recovery mode, avoiding unnecessary resource waste caused by turning on too many target heat exchange indoor units.

[0097] While the controller controls the target heat exchange indoor unit to operate in the heating mode to provide cooling energy for the refrigeration indoor unit, it will inevitably affect the indoor temperature of the target heat exchange indoor unit.

[0098] Based on this, in one embodiment, after the controller controls the target heat exchange indoor unit to operate in the heating mode and condenses and releases heat for the refrigerant discharged from the compressor, it further includes: after running for a preset duration, returning to the step of obtaining the total heating capacity of the heating indoor units operating in the heating mode and the total cooling capacity of the refrigeration indoor units operating in the cooling mode in the multi-split air-conditioning system.

[0099] Among them, the preset duration is the stable time required for the multi-split air-conditioning system to reach a stable state after adjustment. After the controller controls the target heat exchange indoor unit to operate in the heating mode, the multi-split air-conditioning system needs to run for a preset time to reach a stable state again.

[0100] Specifically, after the controller controls the target heat exchange indoor units with the number of turned-on units equal to the number of target heat exchange indoor units to be turned on and runs for a preset duration, the multi-connected air conditioning system has stabilized from the adjusted state. At this time, the controller returns to the step of running to obtain the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-connected air conditioning system, performs capacity detection again, and dynamically controls the multi-connected air conditioning system for ultra-low temperature cooling.

[0101] In one embodiment, if the total capacity of the target heat exchange indoor units in the target heat exchange indoor unit sequence is less than the capacity difference, the controller controls all the target heat exchange indoor units in the target heat exchange indoor unit sequence to turn on and maintains the operation of the main body cooling mode.

[0102] In one embodiment, as Figure 7 shown, controlling the target heat exchange indoor unit to operate in the heating mode, and the refrigerant discharged from the compressor undergoes condensation heat release, including the following steps:

[0103] Step 702, sort each target heat exchange indoor unit in ascending order according to the indoor environmental temperature of the target heat exchange indoor unit to obtain a target heat exchange indoor unit sequence.

[0104] Specifically, the specific implementation manner of step 702 is basically the same as that of step 302, and will not be elaborated here.

[0105] Step 704, control the first target heat exchange indoor unit in the target heat exchange indoor unit sequence to operate in the heating mode, and perform condensation heat release on the refrigerant discharged from the compressor.

[0106] Among them, the first target heat exchange indoor unit in the target heat exchange indoor unit sequence is the target heat exchange indoor unit with the lowest indoor environmental temperature in the target heat exchange indoor unit sequence.

[0107] Specifically, the controller controls the first target heat exchange indoor unit in the target heat exchange indoor unit sequence to operate in the heating mode, and performs condensation heat release on the refrigerant discharged from the compressor.

[0108] Step 706, if after running for a preset time, the total capacity of the heating indoor units in the multi-connected air conditioning system is less than the total capacity of the cooling indoor units, control the next target heat exchange indoor unit in the target heat exchange indoor unit sequence to operate in the heating mode, and perform condensation heat release on the refrigerant discharged from the compressor.

[0109] Among them, the preset time is the stable time required for the multi-connected air conditioning system to reach a stable state after adjustment. After the controller controls the target heat exchange indoor unit to operate in the heating mode, the multi-connected air conditioning system needs to run for a preset time to reach a stable state again.

[0110] Specifically, the controller controls the first target heat exchange indoor unit in the target heat exchange indoor unit sequence to operate in the heating mode. After the multi-split air conditioning system has been operating for a preset time, the controller obtains the total capacity of the heating indoor units and the total capacity of the cooling indoor units in the multi-split air conditioning system in real time. If the total capacity of the heating indoor units is less than the total capacity of the cooling indoor units, it indicates that only the first target heat exchange indoor unit is turned on, and the heating indoor units in the multi-split air conditioning system still cannot meet the cooling demand of the cooling indoor units. The controller controls the next target heat exchange indoor unit in the target heat exchange indoor unit sequence to operate in the heating mode to condense and release heat from the refrigerant discharged by the compressor.

[0111] In this embodiment, the controller obtains the total capacity of the heating indoor units and the total capacity of the cooling indoor units in the multi-split air conditioning system after the multi-split air conditioning system has been operating for a preset time, and determines whether to continue to turn on a new target heat exchange indoor unit, which can avoid misjudgment and waste of operating resources caused by judging based on the total capacity of the heating indoor units and the total capacity of the cooling indoor units in the multi-split air conditioning system when the multi-split air conditioning system has not yet stabilized.

[0112] In one embodiment, if after running for the preset time, the total capacity of the heating indoor units in the multi-split air conditioning system is less than the total capacity of the cooling indoor units, and there are no idle indoor units that can be used as target heat exchange indoor units in the current multi-split air conditioning system, the controller will control the multi-split air conditioning system to maintain the current operating state and monitor the operating state of the indoor units in the multi-split air conditioning system in real time. When a new idle indoor unit appears, return to execute the step of obtaining the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-split air conditioning system.

[0113] While the controller controls the target heat exchange indoor unit to operate in the heating mode to provide cooling energy for the cooling indoor unit, it will inevitably affect the indoor temperature of the target heat exchange indoor unit.

[0114] Based on this, in one embodiment, after the controller controls the target heat exchange indoor unit to operate in the heating mode to condense and release heat from the refrigerant discharged by the compressor, it further includes: when the indoor environmental temperature of the target heat exchange indoor unit operating in the heating mode is greater than the second preset environmental temperature, controlling the target heat exchange indoor unit to stop operating in the heating mode, and returning to execute the step of obtaining the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-split air conditioning system.

[0115] Specifically, when the controller controls the target heat exchange indoor unit to operate in the heating mode and condenses and releases heat from the refrigerant discharged by the compressor, it is necessary to monitor the ambient temperature of the indoor environment where the target heat exchange indoor unit is located in real time. When the ambient temperature of the indoor environment of the target heat exchange indoor unit operating in the heating mode is greater than the second preset ambient temperature, the controller needs to immediately control the target heat exchange indoor unit to stop operating in the heating mode to avoid the ambient temperature of the indoor environment where the target heat exchange indoor unit is located being too high due to continuous operation in the heating mode, causing discomfort to the user and affecting the user experience.

[0116] Since the controller controls the target heat exchange indoor unit with too high an indoor environment temperature to operate in the heating mode, it needs to return to the step of obtaining the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-split air conditioning system, and re-determine whether it is necessary to control other idle indoor units to operate in the heating mode again in the current multi-split air conditioning system, and whether there are idle indoor units that can be used as the target heat exchange indoor unit in the current multi-split air conditioning system.

[0117] In this embodiment, the controller detects the ambient temperature of the indoor environment where the target heat exchange indoor unit is located in real time. When the ambient temperature of the indoor environment of the target heat exchange indoor unit operating in the heating mode is greater than the second preset ambient temperature, the controller needs to immediately control the target heat exchange indoor unit to stop operating in the heating mode to avoid the situation that the ambient temperature of the indoor environment where the target heat exchange indoor unit is located is too high due to continuous operation in the heating mode, causing discomfort to the user, and further improving the user experience.

[0118] In one embodiment, as Figure 8 shown, a method for controlling ultra-low temperature refrigeration of a multi-split air conditioning system is provided, which specifically includes the following steps:

[0119] First, the controller obtains the outdoor ambient temperature t 外 of the area where the multi-split air conditioning system is located. When the outdoor ambient temperature t 外 of the multi-split air conditioning system is less than the first preset ambient temperature t1, obtain the operating states of the indoor units in the multi-split air conditioning system, and determine whether there are any cooling indoor units operating in the cooling mode according to the operating states of the indoor units. If so, obtain the total capacity C 制热 of the heating indoor units operating in the heating mode and the total capacity C 制冷 of the cooling indoor units operating in the cooling mode in the multi-split air conditioning system. If the total capacity C 制热 of the heating indoor units is not less than the total capacity C 制冷 of the cooling indoor units, it means that the multi-split air conditioning system is already in the full heat recovery mode at this time, and there is no risk of frequently triggering the anti-freezing protection. The controller controls the multi-split air conditioning system to continue operating in the current operating mode.

[0120] If the total capacity C of the heating indoor unit 制热 is less than the total capacity C of the cooling indoor unit 制冷 , the controller determines the idle indoor units in the multi-split air conditioning system according to the operating states of the indoor units in the multi-split air conditioning system, and determines the idle indoor units with available tags as the available idle indoor units. Obtain the indoor environmental temperature t of the indoor environment where the available idle indoor unit is located 内 , and determine the available idle indoor unit with the indoor environmental temperature t 内 less than the second preset environmental temperature t2 as the target heat exchange indoor unit.

[0121] Arrange the target indoor heat exchange units in ascending order according to the indoor environmental temperature t of the target heat exchange indoor unit 内 to obtain the target heat exchange indoor unit sequence. Based on the capacity difference C 制热 between the total capacity C of the heating indoor unit and the total capacity C of the cooling indoor unit 制冷 , and the heating capacity c of each target heat exchange indoor unit in the target heat exchange indoor unit sequence, determine the number Q 差 of the target heat exchange indoor units to be turned on 需 .

[0122] Control the target heat exchange indoor units arranged in the front in the target heat exchange indoor unit sequence to operate in the heating mode until the number Q 目标 of the target indoor heat exchangers turned on in the target heat exchange indoor unit sequence 需 is equal to the number Q of the target heat exchange indoor units to be turned on, and control the multi-split air conditioning system to enter the full heat recovery mode.

[0123] If the total heating capacity c 总 of the target indoor heat exchanger is less than the capacity difference C 差 , then control all the target heat exchange indoor units in the target heat exchange indoor unit sequence to be turned on, and control the multi-split air conditioning system to enter the main body cooling mode.

[0124] After the adjusted multi-split air conditioning system has run for a preset duration, return to execute the step of obtaining the total capacity C 制热 of the heating indoor unit and the total capacity C 制冷 of the cooling indoor unit in the multi-split air conditioning system.

[0125] While controlling the target heat exchange indoor unit to operate in the heating mode, the controller will continuously monitor the indoor environmental temperature t of the indoor environment where the target heat exchange indoor unit is located 内 . If it is monitored that the indoor environmental temperature t 内 of the target heat exchange indoor unit is greater than the second preset environmental temperature t2, the controller will immediately control the target heat exchange indoor unit to stop operating in the heating mode, and return to obtain the total capacity C 制热The total capacity C of the refrigerating indoor unit operating in the refrigeration mode 制冷 steps

[0126] In the ultra-low temperature refrigeration control method of the multi-connected air-conditioning system in this embodiment, the idle indoor units in the heat recovery multi-connected unit system are used as condensers, so that the refrigerant bypasses the low outdoor temperature environment and directly enters the indoor unit side, improving the pipe temperature of the refrigerating indoor unit and avoiding the frequent occurrence of anti-freezing protection for the refrigerating indoor unit due to too low pipe temperature, thus enhancing the user experience.

[0127] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are shown in sequence according to the arrows, these steps do not necessarily have to be executed in the order indicated by the arrows. Unless otherwise clearly stated in this article, the execution of these steps has no strict order limitation, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages do not necessarily have to be executed at the same time, but can be executed at different times. The execution order of these steps or stages does not necessarily have to be sequential, but can be executed alternately or in turn with at least a part of other steps or steps or stages in other steps.

[0128] Based on the same inventive concept, the embodiments of the present application also provide a multi-connected air-conditioning system ultra-low temperature refrigeration control device for implementing the above-mentioned multi-connected air-conditioning system ultra-low temperature refrigeration control method. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the multi-connected air-conditioning system ultra-low temperature refrigeration control device provided below can refer to the limitations on the multi-connected air-conditioning system ultra-low temperature refrigeration control method in the above text, and will not be repeated here.

[0129] In one embodiment, as Figure 9 shown, a multi-connected air-conditioning system ultra-low temperature refrigeration control device 900 is provided, including: a capacity acquisition module 901, a target heat exchange indoor unit determination module 902, and a control module 903, where:

[0130] The capacity acquisition module 901 is configured to acquire the total capacity of the heating indoor units operating in the heating mode and the total capacity of the refrigerating indoor units operating in the refrigeration mode in the multi-connected air-conditioning system when the outdoor ambient temperature of the multi-connected air-conditioning system is less than the first preset ambient temperature.

[0131] The target heat exchange indoor unit determination module 902 is configured to determine the target heat exchange indoor unit from the idle indoor units in the multi-connected air-conditioning system if the total capacity of the heating indoor units is less than the total capacity of the refrigerating indoor units.

[0132] The control module 903 is configured to control the target heat exchange indoor unit to operate in the heating mode and condense and release heat from the refrigerant discharged by the compressor.

[0133] For the above multi-split air conditioning system ultra-low temperature refrigeration control device, when the outdoor ambient temperature of the multi-split air conditioning system is less than the first preset ambient temperature, at this time the outdoor environment of the multi-split air conditioning system is in an ultra-low temperature environment. Obtain the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-split air conditioning system. If the total capacity of the heating indoor units is less than the total capacity of the cooling indoor units, it means that the heating indoor units in the multi-split air conditioning system cannot meet the cooling requirements of the cooling indoor units. At least a part of the refrigerant flowing through the cooling indoor units in the current multi-split air conditioning system comes from the outdoor unit heat exchanger, which is likely to cause the indoor units to frequently start the anti-freezing protection. Determine the target heat exchange indoor unit from the idle indoor units of the multi-split air conditioner system, control the target heat exchange indoor unit to operate in the heating mode, and condense and release heat from the refrigerant discharged by the compressor in the multi-split air conditioning system, so that the refrigerant flowing through the cooling indoor units does not pass through the outdoor heat exchanger in the ultra-low temperature environment, which can effectively prevent the indoor units from frequently entering the anti-freezing protection and improve the user experience.

[0134] In one embodiment, the target heat exchange indoor unit determination module is further configured to: obtain the indoor ambient temperature of each idle indoor unit in the multi-split air conditioning system; use the idle indoor unit with the indoor ambient temperature less than the second preset ambient temperature as the target heat exchange indoor unit.

[0135] In one embodiment, the target heat exchange indoor unit determination module is further configured to: determine the target heat exchange indoor unit from the idle indoor units of the multi-split air conditioning system according to the available label; the available label is preset based on the importance of the room.

[0136] In one embodiment, the target heat exchange indoor unit determination module is further configured to: obtain the idle indoor units of the multi-split air conditioning system; determine the idle indoor unit with an available label and the indoor ambient temperature less than the second preset ambient temperature from each idle indoor unit as the target heat exchange indoor unit.

[0137] In one embodiment, the control module is further configured to: sort the target heat exchange indoor units in ascending order according to the indoor ambient temperature of the target heat exchange indoor units to obtain a target heat exchange indoor unit sequence; control the first target heat exchange indoor unit in the target heat exchange indoor unit sequence to operate in the heating mode and condense and release heat from the refrigerant discharged by the compressor; if after operating for a preset time, the total capacity of the heating indoor units in the multi-split air conditioning system is less than the total capacity of the cooling indoor units, then control the next target heat exchange indoor unit in the target heat exchange indoor unit sequence to operate in the heating mode and condense and release heat from the refrigerant discharged by the compressor.

[0138] In one embodiment, the ultra-low temperature refrigeration control device of the multi-connected air conditioning system further includes: a full heat recovery mode operation module, configured to control the multi-connected air conditioning system to enter the full heat recovery mode when the total capacity of the heating indoor units in the multi-connected air conditioning system is not less than the total capacity of the cooling indoor units.

[0139] In one embodiment, the ultra-low temperature refrigeration control device of the multi-connected air conditioning system further includes: a target heat exchange indoor unit shutdown module, configured to control the target heat exchange indoor unit to stop operating in the heating mode and return to the step of obtaining the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-connected air conditioning system when the indoor environmental temperature of the target heat exchange indoor unit operating in the heating mode is greater than the second preset environmental temperature.

[0140] In one embodiment, the control module is further configured to: control the electronic expansion valve of the target heat exchange indoor unit to open, the blower to operate at a preset gear, the heating solenoid valve of the corresponding mode converter to open, and the cooling solenoid valve of the mode converter to close.

[0141] Each module in the above ultra-low temperature refrigeration control device of the multi-connected air conditioning system can be implemented in whole or in part by software, hardware, and their combination. The above modules can be embedded in the processor of the computer device in hardware form or be independent of it, or be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to the above modules.

[0142] In one embodiment, a computer device is provided. The computer device can be a controller in the multi-connected air conditioning system, and its internal structure diagram can be as Figure 10 shown. The computer device includes a processor, a memory, and a network interface connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data such as the outdoor environmental temperature, the first preset environmental temperature, the total capacity of the heating indoor units, and the total capacity of the cooling indoor units. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it implements an ultra-low temperature refrigeration control method for a multi-connected air conditioning system.

[0143] Those skilled in the art can understand, Figure 10The structure shown is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0144] In one embodiment, a computer device is provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the specific steps in the embodiment of the above multi-connected air-conditioning system ultra-low temperature refrigeration control method are implemented.

[0145] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the specific steps in the embodiment of the above multi-connected air-conditioning system ultra-low temperature refrigeration control method are implemented.

[0146] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the specific steps in the embodiment of the above multi-connected air-conditioning system ultra-low temperature refrigeration control method are implemented.

[0147] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0148] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memories. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logic devices, data processing logics based on quantum computing, etc., without limitation.

[0149] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0150] The above-described embodiments merely represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method for controlling ultra-low temperature refrigeration of a multi-connected air conditioning system, characterized in that, The method includes: When the outdoor ambient temperature of the multi-connected air conditioning system is less than the first preset ambient temperature, obtaining the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-connected air conditioning system; If the total capacity of the heating indoor units is less than the total capacity of the cooling indoor units, determining a target heat exchange indoor unit from the idle indoor units in the multi-connected air conditioning system; Sorting the target heat exchange indoor units in ascending order according to the indoor ambient temperature of the target heat exchange indoor units to obtain a target heat exchange indoor unit sequence; Based on the capacity difference between the total capacity of the heating indoor units and the total capacity of the cooling indoor units, and the heating capacity of each target heat exchange indoor unit in the target heat exchange indoor unit sequence, determining the number of target heat exchange indoor units to be turned on; Controlling the target heat exchange indoor units sorted in the front in the target heat exchange indoor unit sequence to operate in the heating mode to condense and release heat from the refrigerant discharged by the compressor; Until the number of target heat exchange indoor units turned on in the target heat exchange indoor unit sequence is equal to the number of target heat exchange indoor units to be turned on, controlling the multi-connected air conditioning system to enter the full heat recovery mode.

2. The method according to claim 1, wherein Determining a target heat exchange indoor unit from the idle indoor units in the multi-connected air conditioning system includes: Obtaining the indoor ambient temperature of each idle indoor unit in the multi-connected air conditioning system; Regarding the idle indoor units with the indoor ambient temperature less than the second preset ambient temperature as the target heat exchange indoor units.

3. The method according to claim 1, characterized in that Determining a target heat exchange indoor unit from the idle indoor units in the multi-connected air conditioning system includes: Determining a target heat exchange indoor unit from the idle indoor units in the multi-connected air conditioning system according to the available label; the available label is preset based on the importance of the room.

4. The method according to claim 3, wherein The determining a target heat exchange indoor unit from the idle indoor units in the multi-connected air conditioning system according to the available label includes: Obtaining the idle indoor units in the multi-connected air conditioning system; Regarding the idle indoor units that have the available label and the indoor ambient temperature of which is less than the second preset ambient temperature as the target heat exchange indoor units from each of the idle indoor units.

5. The method according to claim 1, wherein The method further includes: After running for a preset duration, returning to the step of obtaining the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-connected air conditioning system.

6. The method according to any one of claims 2 or 4, characterized in that After the step of controlling the target heat exchange indoor unit to operate in the heating mode to condense and release heat from the refrigerant discharged by the compressor, it further includes: When the indoor ambient temperature of the target heat exchange indoor unit operating in the heating mode is greater than the second preset ambient temperature, controlling the target heat exchange indoor unit to stop operating in the heating mode and returning to the step of obtaining the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-connected air conditioning system.

7. The method according to claim 1, characterized in that, Controlling the target heat exchange indoor unit to operate in the heating mode includes: Controlling the electronic expansion valve of the target heat exchange indoor unit to open, the fan to operate at a preset gear, the heating solenoid valve of the corresponding mode converter to open, and the cooling solenoid valve of the mode converter to close.

8. A multi-connected air conditioning system ultra-low temperature refrigeration control device, characterized in that, The device includes: A capacity acquisition module, configured to acquire the total capacity of the heating indoor units operating in the heating mode and the total capacity of the cooling indoor units operating in the cooling mode in the multi-connected air-conditioning system when the outdoor ambient temperature of the multi-connected air-conditioning system is lower than a first preset ambient temperature; A target heat exchange indoor unit determination module, configured to determine a target heat exchange indoor unit from the idle indoor units in the multi-connected air-conditioning system if the total capacity of the heating indoor units is less than the total capacity of the cooling indoor units; A control module, configured to sort the target heat exchange indoor units in ascending order of the indoor ambient temperature of the target heat exchange indoor units to obtain a target heat exchange indoor unit sequence; determine the number of target heat exchange indoor units to be turned on based on the capacity difference between the total capacity of the heating indoor units and the total capacity of the cooling indoor units, and the heating capacities of the target heat exchange indoor units in the target heat exchange indoor unit sequence; control the target heat exchange indoor units sorted in the front in the target heat exchange indoor unit sequence to operate in the heating mode to condense and release heat from the refrigerant discharged by the compressor; until the number of the target heat exchange indoor units turned on in the target heat exchange indoor unit sequence is equal to the number of target heat exchange indoor units to be turned on, control the multi-connected air-conditioning system to enter the full heat recovery mode.

9. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, the steps of the method according to any one of claims 1 to 7 are implemented.

11. A computer program product, comprising a computer program, characterized in that, When this computer program is executed by the processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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