Multi-connected system, control method and device thereof, storage medium and program product

Abstract

The application discloses a multi-connected system and a control method, device, storage medium and computer program product thereof. The method comprises the following steps: in the case that the multi-connected system is in heating operation, for all air conditioning units participating in heating, the outdoor fan of each air conditioning unit is controlled to be turned on, the main air outlet of the outdoor fan of each air conditioning unit is controlled to be turned on, and all side air outlets are controlled to be turned off; according to the outdoor fin temperature of each air conditioning unit in all air conditioning units participating in heating, the opening and closing of the outdoor fan of each air conditioning unit, the opening and closing of the main air outlet of the outdoor fan, and the opening and closing and air outlet angle of more than one side air outlet are controlled, and the collaborative defrosting between each air conditioning unit and its adjacent unit group is realized. According to the scheme, the heat generated in the defrosting process can be saved, and the energy consumption of heating can be reduced by making the adjacent air conditioning units defrost collaboratively when the multi-connected system is in heating.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning technology, specifically relating to a control method, device, multi-split air conditioning system, storage medium, and computer program product for a multi-split air conditioning system, and particularly to a control method, device, multi-split air conditioning system, storage medium, and computer program product for a multi-system air conditioning unit with coordinated defrosting. Background Technology

[0002] Air conditioners (such as air-cooled air conditioners) may experience frost formation on the outdoor unit during the heating process. After the outdoor unit completes the defrosting process, it directly discharges the heat generated during defrosting into the air through the fan, resulting in heat waste.

[0003] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The purpose of this invention is to provide a control method, device, multi-split air conditioning system, storage medium, and computer program product for a multi-split air conditioning system, in order to solve the problem that the heat generated during the defrosting process of an air conditioner (such as a fan-cooled air conditioner) is directly discharged into the air after defrosting, resulting in heat waste. The invention aims to achieve the effect of saving the heat generated during the defrosting process of the multi-split air conditioning system and reducing the energy consumption of the multi-split air conditioning system by enabling adjacent systems to defrost in a coordinated manner when the multi-split air conditioning system is heating.

[0005] This invention provides a control method for a multi-split air conditioning system. The multi-split system includes: air conditioning units, wherein the number of air conditioning units is two or more; each air conditioning unit has outdoor unit fins and an outdoor unit fan, each outdoor unit fan has a main air outlet and a side air outlet, the main air outlet and the side air outlet have different air outlet directions; the number of side air outlets is one or more, and the different side air outlets also have different air outlet directions; both the main air outlet and the side air outlet can be opened or closed, and the air outlet angle of the side air outlet can be adjusted; the control method for the multi-split system includes: when the multi-split system is in heating operation, controlling the outdoor unit fan of each air conditioning unit participating in heating to turn on, and controlling... The system controls the opening and closing of the main air outlet of the outdoor unit fan of each of the aforementioned air conditioning units, and the closing of all the side air outlets; it acquires the fin temperature of the outdoor unit of each of the aforementioned air conditioning units participating in heating; based on the fin temperature of the outdoor unit of each of the aforementioned air conditioning units participating in heating, it controls the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet of the outdoor unit fan, and the opening and closing of at least one of the side air outlets and their air outlet angles, thereby achieving coordinated defrosting between each of the aforementioned air conditioning units and its adjacent unit groups; wherein, the adjacent unit groups include: combinations of air conditioning units in which at least one other outdoor unit fan can be reached by at least one of the air outlet angles of one or more of the side air outlets of the outdoor unit fan of each of the aforementioned air conditioning units.

[0006] In some embodiments, each of the air conditioning units further includes an air outlet device; in each air conditioning unit, the air outlet device is located at the air outlet position of the outdoor unit fan; the main air outlet is located on the upper part or top of the air outlet device, and one or more side air outlets are located on the side of the air outlet device; wherein, when the air outlet device is vertically arranged, when the main air outlet is open, air is discharged vertically upwards from the air outlet device, and when one or more side air outlets are open, air is discharged downwards from the side of the air outlet device at a set angle.

[0007] In some embodiments, the method further includes: for each of the two or more air conditioning units, pre-establishing a communication connection between each air conditioning unit and its adjacent unit group; wherein, the communication connection between each air conditioning unit and its adjacent unit group includes: a communication link between each air conditioning unit and any air conditioning unit in its adjacent unit group, and at least one side air outlet of each air conditioning unit pre-associated with any air conditioning unit in its adjacent unit group, and the air outlet angle of each of the at least one side air outlet pre-associated with any air conditioning unit in its adjacent unit group; based on all the units participating in heating... The system controls the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets of each air conditioning unit based on the outdoor unit fin temperature of each air conditioning unit participating in heating, thereby achieving coordinated defrosting between each air conditioning unit and its adjacent unit groups. This includes: combining the communication connection between each air conditioning unit and its adjacent unit groups, and controlling the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets of each air conditioning unit participating in heating, based on the outdoor unit fin temperature of each air conditioning unit participating in heating, thereby achieving coordinated defrosting between each air conditioning unit and its adjacent unit groups.

[0008] In some implementations, based on the outdoor unit fin temperature of each of the air conditioning units participating in heating, the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets of each air conditioning unit are controlled to achieve coordinated defrosting between each air conditioning unit and its adjacent unit groups. Specifically, this includes: if the outdoor unit fin temperature of any air conditioning unit participating in heating is lower than a preset defrost entry temperature, then that air conditioning unit is identified as the first unit; the outdoor unit fan of the first unit is controlled to close, and the main air outlet of the outdoor unit fan of the first unit is also controlled to close, so that the first unit enters defrost mode; if the outdoor unit fin temperature of any air conditioning unit participating in defrost rises to a preset defrost exit temperature, then that air conditioning unit is identified as the second unit, so that coordinated defrosting between the second unit and its adjacent unit groups is controlled.

[0009] In some implementations, based on the outdoor unit fin temperature of each of the air conditioning units participating in heating, the operation of the outdoor unit fan, the operation of the main air outlet of the outdoor unit fan, and the operation and air outlet angle of at least one of the side air outlets of each air conditioning unit are controlled to achieve coordinated defrosting between each air conditioning unit and its adjacent unit groups. Specifically, this further includes: determining the outdoor unit fin temperature of each air conditioning unit in the adjacent unit group of the second unit; and determining the air conditioning unit with the lowest outdoor unit fin temperature in the adjacent unit group of the second unit as the third unit; controlling the outdoor unit fan of the second unit to turn on; controlling at least one of the side air outlets of the second unit that is pre-associated with the third unit to turn on; and controlling each of the at least one side air outlet to discharge air at an air outlet angle pre-associated with the third unit, so as to blow the defrosting heat of the outdoor unit fins of the second unit to the outdoor unit fins of the third unit, so that the second unit and the third unit can perform coordinated defrosting.

[0010] In some implementations, based on the fin temperature of the outdoor unit of each of the air conditioning units participating in heating, the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets of each air conditioning unit are controlled to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group. Specifically, if the fin temperature of the outdoor unit of the second unit is lower than a preset coordinated defrosting temperature, then all the side air outlets of the outdoor unit fan of the second unit are closed, and the main air outlet of the outdoor unit fan of the second unit is opened, so that the second unit exits the defrosting mode and participates in the heating operation of the multi-split system; wherein, the preset coordinated defrosting temperature is greater than the preset defrosting entry temperature and less than the preset defrosting exit temperature.

[0011] In conjunction with the above method, another aspect of the present invention provides a control device for a multi-split air conditioning system, the multi-split air conditioning system comprising: air conditioning units, the number of which is two or more; each air conditioning unit having outdoor unit fins and an outdoor unit fan, each outdoor unit fan having a main air outlet and a side air outlet, the main air outlet and the side air outlet having different air outlet directions; the number of side air outlets being one or more, and the different side air outlets also having different air outlet directions; both the main air outlet and the side air outlet can be opened or closed, and the air outlet angle of the side air outlet can be adjusted; the control device for the multi-split air conditioning system comprises: a control unit configured to, when the multi-split air conditioning system is in heating operation, control the outdoor unit fan of each air conditioning unit participating in heating to turn on, and control... The control unit is configured to control the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet of the outdoor unit fan, and the opening and closing of at least one of the side air outlets and the air outlet angle of the outdoor unit fan of each of the air conditioning units participating in heating, based on the outdoor unit fin temperature of each of the air conditioning units participating in heating, to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group; wherein, the adjacent unit group includes: a combination of at least one other outdoor unit fan of the air conditioning unit whose air outlet angle of one or more of the side air outlets of the outdoor unit fan of each air conditioning unit can be reached by at least one air outlet angle.

[0012] In some embodiments, each of the air conditioning units further includes an air outlet device; in each air conditioning unit, the air outlet device is located at the air outlet position of the outdoor unit fan; the main air outlet is located on the upper part or top of the air outlet device, and one or more side air outlets are located on the side of the air outlet device; wherein, when the air outlet device is vertically arranged, when the main air outlet is open, air is discharged vertically upwards from the air outlet device, and when one or more side air outlets are open, air is discharged downwards from the side of the air outlet device at a set angle.

[0013] In some embodiments, the control unit is further configured to pre-establish a communication connection between each of the two or more air conditioning units and its adjacent unit group; wherein the communication connection between each air conditioning unit and its adjacent unit group includes: a communication link between each air conditioning unit and any air conditioning unit in its adjacent unit group, and at least one side air outlet of each air conditioning unit pre-associated with any air conditioning unit in its adjacent unit group, and an air outlet angle pre-associated between each of the at least one side air outlet and any air conditioning unit in its adjacent unit group; the control unit, based on... Based on the outdoor unit fin temperature of each of the air conditioning units participating in heating, the system controls the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets of each air conditioning unit to achieve coordinated defrosting between each air conditioning unit and its adjacent unit groups. This includes: combining the communication connection between each air conditioning unit and its adjacent unit groups, and based on the outdoor unit fin temperature of each of the air conditioning units participating in heating, controlling the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets of each air conditioning unit to achieve coordinated defrosting between each air conditioning unit and its adjacent unit groups.

[0014] In some embodiments, the control unit controls the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets of each air conditioning unit, based on the outdoor unit fin temperature of each air conditioning unit participating in heating, to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group. Specifically, this includes: if the outdoor unit fin temperature of any air conditioning unit participating in heating is lower than a preset defrost entry temperature, then that air conditioning unit is identified as the first unit; the outdoor unit fan of the first unit is controlled to close, and the main air outlet of the outdoor unit fan of the first unit is also controlled to close, so that the first unit enters defrost mode; if the outdoor unit fin temperature of any air conditioning unit participating in defrost rises to a preset defrost exit temperature, then that air conditioning unit is identified as the second unit, so as to control the second unit and its adjacent unit group to perform coordinated defrosting.

[0015] In some embodiments, the control unit controls the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets of each air conditioning unit, based on the outdoor unit fin temperature of each air conditioning unit participating in heating, to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group. Specifically, this further includes: determining the outdoor unit fin temperature of each air conditioning unit in the adjacent unit group of the second unit; and determining the outdoor unit fin temperature of the adjacent unit group of the second unit. The air conditioning unit with the lowest fin temperature is designated as the third unit. The outdoor unit fan of the second unit is controlled to open, and at least one of the side air outlets of the second unit, which is pre-associated with the third unit, is controlled to open. Each of the at least one side air outlet is controlled to discharge air at an air outlet angle pre-associated with the third unit, so as to blow the defrosting heat of the outdoor unit fins of the second unit to the outdoor unit fins of the third unit, thereby enabling the second unit and the third unit to perform collaborative defrosting.

[0016] In some embodiments, the control unit controls the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets of each of the air conditioning units participating in heating, based on the outdoor unit fin temperature of each of the air conditioning units participating in heating, to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group. Specifically, if the outdoor unit fin temperature of the second unit is lower than a preset coordinated defrosting temperature, then all the side air outlets of the outdoor unit fan of the second unit are closed, and the main air outlet of the outdoor unit fan of the second unit is opened, so that the second unit exits the defrosting mode and participates in the heating operation of the multi-split system; wherein, the preset coordinated defrosting temperature is greater than the preset defrosting entry temperature and less than the preset defrosting exit temperature.

[0017] In conjunction with the above-mentioned device, the present invention further provides a multi-split air conditioning system, including: the control device for the multi-split air conditioning system described above.

[0018] In conjunction with the above method, the present invention further provides a storage medium comprising a stored program, wherein, when the program is executed, the device on which the storage medium is located executes the steps of the control method for the multi-unit system described above.

[0019] In conjunction with the above method, the present invention further provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the control method for the multi-unit system described above.

[0020] Therefore, the solution of this invention, for multi-split systems (such as multi-system air conditioning units), adds an air outlet device to the upper part of the outdoor unit fan of each system. This air outlet device includes a main air outlet and four side air outlets. When the main air outlet is opened, air is discharged vertically upwards, and when the side air outlets are opened, air is discharged downwards at a set angle. All other outdoor units that can be reached by the side air outlets of each outdoor unit are bound to each of these outdoor units (i.e., a communication association is established). During the heating process of the multi-split system, for all units participating in heating, the outdoor unit fan of each unit is controlled to open, the main air outlet of each unit is opened, and all side air outlets are closed. When any unit needs defrosting, the outdoor unit fan of that unit is turned off, and the main air outlet of that unit is closed. Air outlets; After any unit completes defrosting, for the unit with the lowest defrosting temperature among all adjacent outdoor units bound to that unit, turn on the fan of that outdoor unit, so that the corresponding air outlet of that outdoor unit opens and adjusts the air outlet angle according to the pre-bound side air outlet and air outlet angle of the adjacent outdoor unit with the lowest defrosting temperature, in order to alleviate the billing situation of the adjacent outdoor unit with the lowest defrosting temperature; when the defrosting temperature of any outdoor unit is lower than the user-preset collaborative defrosting temperature, close all side air outlets of that outdoor unit, and open the main air outlet of that outdoor unit for normal heating; thus, by enabling adjacent systems to defrost collaboratively during the heating of the multi-split system, the heat generated during the defrosting process of the multi-split system can be saved, and the energy consumption of the multi-split system for heating can be reduced.

[0021] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0022] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0023] Figure 1 This is a flowchart illustrating an embodiment of the control method for a multi-unit air conditioning system according to the present invention;

[0024] Figure 2 This is a schematic flowchart of an embodiment of the method of the present invention for controlling the first unit to enter defrosting;

[0025] Figure 3 This is a schematic flowchart of an embodiment of the method of the present invention for controlling the second unit to cooperate with the third unit in defrosting;

[0026] Figure 4 This is a schematic diagram of the structure of a control device for a multi-unit air conditioning system according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the air outlet device 1, where (a) is a top view, (b) is a front view, and (c) is a side view;

[0028] Figure 6 This is a structural schematic diagram of the installation location of the air outlet device 1, where (a) is a top view and (b) is a front view;

[0029] Figure 7 This diagram illustrates the defrosting airflow status of the system facing the side air outlet.

[0030] Figure 8 This diagram illustrates the defrosting airflow status of systems that are not directly facing the air outlet.

[0031] Referring to the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0032] 1-Air outlet device; 11-Main air outlet; 12-Side air outlet; 13-Side side of outdoor unit fins; 14-Front side of outdoor unit fins; 2-Fan; 3-Main unit; 102-Acquisition unit; 104-Control unit. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0034] Considering that air conditioners (such as air-cooled air conditioners) need to turn on the fan (i.e., the outdoor unit fan) to exchange heat with the outside air when heating, if the fan is not turned on, the air circulation speed will be reduced, affecting the heat exchange efficiency. After defrosting, the heat generated during the defrosting process is directly discharged into the air, resulting in heat waste. In commercial settings, to meet heating needs, multiple system air conditioning units are often used for heating. If each system in a multi-system air conditioning unit directly discharges the heat generated during defrosting into the air after defrosting, even more heat will be wasted. A multi-system air conditioning unit can be multiple individual air conditioning units or a multi-split system. The difference between a multi-split system and multiple individual air conditioning units lies in whether they share a single control system. The solution of this invention mainly uses a group control scheme. If there are multiple individual air conditioning units, they can be controlled by the same control system through an Internet of Things (IoT) system or a group control system.

[0035] In addition, since multi-system air conditioning units have their own outdoor units and are located in close proximity, if each system can transfer the remaining heat stored inside its own outdoor unit to the vicinity of the outdoor unit fins of nearby systems after defrosting itself, thus delaying the frosting of nearby units, this coordinated defrosting can reduce the defrosting frequency of the entire air conditioning unit (i.e., the multi-system air conditioning unit as a whole), thereby effectively reducing heating energy consumption and reducing the situation of insufficient heat supply at the user end.

[0036] The energy consumption for heating refers to the reduced energy consumption (lower heat output per unit of electricity) caused by frost buildup on the outdoor unit during the air conditioning heating process, which affects the unit's heat exchange. The defrosting process is to remove the frost layer on the outdoor unit. During defrosting, the indoor unit is not heated, and no heat is generated during the entire defrosting process. Therefore, minimizing the number of defrosting cycles can reduce energy consumption. Additionally, delaying the frost buildup process can also reduce heating energy consumption. When the unit's capacity far exceeds user demand, heating energy consumption can be reduced because user demand is fixed; the higher the heat output per unit of electricity, the less electricity is consumed. The solution in this invention can delay frost buildup, reduce defrosting frequency, and increase the heat output per unit of electricity. When the unit's capacity is similar to user demand, the lower the heat output per unit of electricity, the less heat is generated at the user end, potentially leading to insufficient heat supply.

[0037] Therefore, the present invention proposes a control method for a multi-split air conditioning system (such as a multi-system air conditioning unit), specifically a control method for a multi-system air conditioning unit with coordinated defrosting. For the multi-split air conditioning system, an air outlet device 1 is added to the upper part of the outdoor unit fan of each system. This air outlet device 1 includes a main air outlet 11 and four side air outlets 12. When the main air outlet 11 is opened, air is discharged vertically upwards, and when the side air outlets 12 are opened, air is discharged to the side downwards at a set angle. This ensures that the side air outlets 12 of each outdoor unit can reach other outdoor units at an angle. Each outdoor unit is bound to the system (i.e., a communication association is established). When multiple outdoor units participate in the heating process, the system responds based on the defrosting temperature of adjacent units around any outdoor unit. After any outdoor unit completes defrosting, the heat generated during the defrosting process is blown onto the fins of the adjacent outdoor unit that is bound to that outdoor unit. This allows one outdoor unit to assist other nearby outdoor units in defrosting while the other outdoor unit is defrosting, enabling adjacent systems to defrost in a coordinated manner. This saves the heat generated during the defrosting process of multiple air conditioning units, thereby effectively reducing heating energy consumption and reducing the possibility of insufficient heat supply at the user end.

[0038] According to embodiments of the present invention, a control method for a multi-unit air conditioning system is provided, such as... Figure 1The diagram shows a flowchart of an embodiment of the method of the present invention. The multi-split air conditioning system includes: air conditioning units, the number of which is two or more; each of the two or more air conditioning units has outdoor unit fins and an outdoor unit fan, each outdoor unit fan has a main air outlet 11 and a side air outlet 12, the main air outlet 11 and the side air outlet 12 have different air outlet directions, preferably the side air outlet 12 is located to the side of the main air outlet 11; the number of side air outlets 12 is one or more, and the different side air outlets 12 also have different air outlet directions; both the main air outlet 11 and the side air outlet 12 can be opened or closed, and the air outlet angle of the side air outlet 12 can be adjusted. In the solution of the present invention, as... Figure 1 As shown, the control method of the multi-unit system includes steps S110 to S130.

[0039] In step S110, the multi-split system is controlled to operate in heating mode; for two or more air conditioning units, when the multi-split system is operating in heating mode, for each of the air conditioning units participating in heating, the outdoor unit fan of each air conditioning unit is controlled to turn on, and the main air outlet 11 of the outdoor unit fan of each air conditioning unit is controlled to open, and all the side air outlets 12 are closed.

[0040] In step S120, when all the air conditioning units involved in heating are in heating operation, the fin temperature of the outdoor unit of each of the air conditioning units involved in heating is obtained, specifically the fin temperature at the center position of the front side of the outdoor unit fins of each air conditioning unit.

[0041] In step S130, based on the fin temperature of the outdoor unit of each of the air conditioning units participating in heating, the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet 11 of the outdoor unit fan, and the opening and closing of at least one of the side air outlets 12 and their air outlet angles are controlled to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group. The adjacent unit group includes combinations of air conditioning units in which at least one other outdoor unit fan can be reached from at least one of the air outlet angles of one or more of the side air outlets 12 of each air conditioning unit's outdoor unit fan. The other outdoor unit fans refer to outdoor unit fans in the multi-split system other than the outdoor unit fan of each air conditioning unit itself.

[0042] In the solution of this invention, for multi-system air conditioning units, each system can, after defrosting itself, transfer the remaining heat stored inside its own outdoor unit to the vicinity of the outdoor unit fins of nearby systems to delay the frosting of nearby units; thereby, when the multi-system air conditioning unit is heating, adjacent systems can cooperate in defrosting, which can save the heat generated during the defrosting process of the multi-system air conditioning unit, thereby effectively reducing the energy consumption of heating and reducing the situation of insufficient heat supply at the user end.

[0043] In some embodiments, each of the air conditioning units further includes an air outlet device 1, i.e., an air outlet device 1 disposed at the air outlet position of the outdoor unit fan; in each of the air conditioning units, the air outlet device 1 is disposed at the air outlet position of the outdoor unit fan, preferably the air outlet device 1 is disposed on the upper part or top of the outdoor unit fan; the main air outlet 11 is disposed on the upper part or top of the air outlet device 1, and one or more side air outlets 12 are disposed on the side of the air outlet device 1; that is, the air outlet device 1 has a main air outlet 11 and a side air outlet 12, the main air outlet 11 and the side air outlet 12 have different air outlet directions, preferably the side air outlet 12 is located on the side of the main air outlet 11.

[0044] When the air outlet device 1 is vertically arranged, the main air outlet 11 opens and the air is discharged vertically upwards towards the air outlet device 1. When one or more of the side air outlets 12 are open, the air is discharged downwards towards the side of the air outlet device 1 at a set angle.

[0045] Figure 5 This is a schematic diagram of the air outlet device 1, where (a) is a top view, (b) is a front view, and (c) is a side view. Figure 6 This is a structural schematic diagram showing the installation location of the air outlet device 1, where (a) is a top view and (b) is a front view. In this invention, for each system in a multi-system air conditioning unit, an air outlet device 1 is added to the upper part of the outdoor unit fan of each system. The structure of the air outlet device 1 is as follows... Figure 5 As shown, the air outlet device 1 has an air outlet, which includes a main air outlet 11 and four side air outlets 12.

[0046] Among them, control such as Figure 5The main air outlet 11 shown above blows air vertically upwards. The system can control the opening and closing of the main air outlet 11. Since the outdoor unit fan blows cold air for most of the heating process, blowing it outwards would accelerate the frosting process of surrounding units. Therefore, blowing air vertically upwards through the main air outlet 11 during normal heating can improve the heat exchange efficiency of the outdoor unit without affecting surrounding units. The system can control the opening and closing of the main air outlet 11 through electrical control, such as controlling the air guide vanes to fully close or open, or adding a damper device to control whether the damper device blocks or does not block the main air outlet 11. It should be noted that the angle of the main air outlet 11 cannot be adjusted; it must either be closed or blow air vertically upwards.

[0047] Control such as Figure 5 The side air outlet 12 shown directs airflow downwards at a set angle. Because the outdoor unit stores some hot air for a short period immediately after defrosting, directing the airflow downwards at the set angle from the side air outlet 12 delivers this heat to the surrounding unit's fins, delaying the frosting process on those units. The set angle is typically 45°, but can be adjusted based on the actual height of the unit's fins. This adjustment depends on the unit's specific structure and the installation distance between adjacent units. The adjusted angle should ensure that an installer can feel the airflow from the side of the blower unit when placing their hand near the fins of the unit being blew on.

[0048] The side air outlet 12 can be a louvered air outlet. The louvers on the side air outlet 12 allow control of the left and right angle of the airflow. The system can control the opening and closing of the side air outlet 12, and when the side air outlet 12 is open, the left and right airflow angle can be controlled. Once the outdoor unit fan of a specific target unit model is selected, the left and right airflow angle will not change until it is closed.

[0049] The installation location of the air outlet device 1 is as follows: Figure 6 As shown. Figure 6 As shown, the outdoor unit fins are positioned between the main unit 3 and the fan 2. The air outlet device 1 is located above the fan 2. The side of the outdoor unit fins is shown as side fin 13, and the front of the outdoor unit fins is shown as front fin 14. A temperature sensor is placed at the center of the front fin 14 to measure the defrost temperature of the outdoor unit. The main unit 3 is a compressor.

[0050] In the present invention, by setting an air outlet device 1 on the upper part of the outdoor unit fan of each system, and setting a main air outlet 11 and one or more side air outlets 12 on the air outlet device 1, air can be reliably discharged using the main air outlet 11 in heating mode, and the main air outlet 11 can be closed in defrosting mode. The number of side air outlets 12 to be opened and the air outlet angle when they are open can be flexibly selected. This makes it convenient for each system to transfer the remaining heat stored inside its own outdoor unit to the vicinity of the outdoor unit fins of nearby systems after defrosting, so as to delay the frosting of nearby units. This realizes that when multiple air conditioning units are heating, adjacent systems can cooperate in defrosting, saving the heat generated during the defrosting process of multiple air conditioning units, effectively reducing the energy consumption of heating, and reducing the situation of insufficient heat supply at the user end.

[0051] In some embodiments, the control method for the multi-split air conditioning system described in the present invention further includes: before controlling the multi-split air conditioning system to operate in heating mode, for each of the two or more air conditioning units, establishing a communication connection between each air conditioning unit and its adjacent unit groups in advance, preferably establishing a communication connection between the outdoor unit of each air conditioning unit and the outdoor units in its adjacent unit groups in advance; specifically, for each air conditioning unit, the group of units containing at least one outdoor unit fan of other air conditioning units whose outdoor unit fan can be reached by at least one of the air outlet angles of one or more of the side air outlets 12 of each air conditioning unit is denoted as the adjacent unit group of each air conditioning unit; establishing a communication connection between each air conditioning unit and its adjacent unit groups in advance, preferably establishing a communication connection between the outdoor unit fan of each air conditioning unit and the outdoor unit fans in the adjacent unit groups of each air conditioning unit; wherein, the other air conditioning units are all the air conditioning units other than each air conditioning unit in the two or more air conditioning units.

[0052] The communication connection between each air conditioning unit and its adjacent unit group includes: a communication link between each air conditioning unit and any air conditioning unit in its adjacent unit group, and at least one side air outlet 12 of each air conditioning unit that is pre-associated with any air conditioning unit in its adjacent unit group, and the air outlet angle of each side air outlet 12 that is pre-associated with any air conditioning unit in its adjacent unit group.

[0053] Accordingly, in step S130, based on the outdoor unit fin temperature of each of the air conditioning units participating in heating, the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet 11 of the outdoor unit fan, and the opening and closing of at least one of the side air outlets 12 and the air outlet angle of each air conditioning unit are controlled to achieve coordinated defrosting between each air conditioning unit and its adjacent unit groups. This includes: combining the communication connection between each air conditioning unit and its adjacent unit groups, and based on the outdoor unit fin temperature of each of the air conditioning units participating in heating, controlling the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet 11 of the outdoor unit fan, and the opening and closing of at least one of the side air outlets 12 and the air outlet angle of each air conditioning unit to achieve coordinated defrosting between each air conditioning unit and its adjacent unit groups.

[0054] Specifically, after the outdoor unit is installed, the user or installer needs to manually bind the air outlet and air outlet angle of the corresponding air outlet device 1 of the adjacent outdoor unit on the air conditioner operator. The binding is divided into two cases: the air outlet directly facing the air outlet device 1 and the air outlet not directly facing the air outlet device 1. The following is an example of outdoor unit A, and an adjacent outdoor unit B or an adjacent outdoor unit C of outdoor unit A.

[0055] The first scenario: directly facing the air outlet of air outlet device 1. For details, please refer to [reference needed]. Figure 7 The example shown, Figure 7 This diagram illustrates the defrosting and airflow status of a system facing a side air outlet. When an adjacent outdoor unit B of outdoor unit A is facing the first side air outlet of outdoor unit A, outdoor unit B is attached to the first side air outlet of outdoor unit A. The airflow angle of the first side air outlet is 90°, meaning the first side air outlet blows air vertically.

[0056] There are two methods for binding outdoor unit B to the first side air outlet of outdoor unit A: one method requires each outdoor unit to have an individual display for binding settings of the air outlet and air outlet angle; the other method uses group control to bind settings of the air outlet and air outlet angle of each outdoor unit. After the installer installs outdoor unit A and outdoor unit B, the binding settings of outdoor unit B's air outlet and air outlet angle are configured using the above method. The settings are: outdoor unit B, air outlet angle of the first side air outlet is 90°.

[0057] The second scenario: The air outlet is not directly facing the air outlet device 1. For details, please refer to... Figure 8 The example shown, Figure 8This diagram illustrates the defrosting airflow status of a system that is not directly facing the air outlet. When an adjacent outdoor unit C of outdoor unit A is not directly facing any side air outlet 12 of outdoor unit A, then outdoor unit A must have two air outlets (side air outlets) that can blow air towards outdoor unit C at an angle. Assuming that the second and third side air outlets of outdoor unit A blow air towards outdoor unit C at an angle, then outdoor unit C is bound to the corresponding angles of the second and third side air outlets of outdoor unit A.

[0058] The outdoor unit C is bound to the corresponding angles of the second and third side air outlets of the outdoor unit A. This includes adjusting the left and right angles, similar to adjusting the up and down angles. The installer can adjust these angles by hand after installation. For example, if the outdoor unit A has a first, second, third, and fourth side air outlet corresponding to the four cardinal directions (north, south, east, and west), and the adjacent outdoor unit C is to the southeast of outdoor unit A, then neither the western (third) side air outlet nor the northern (fourth) side air outlet will be able to reach outdoor unit C. After installation, the installer will set the following information using the method described above: outdoor unit C, first side air outlet angle 45°, second side air outlet angle 135°.

[0059] In the present invention, by pre-establishing a communication connection between each of the two or more air conditioning units and its adjacent unit groups, and then combining the communication connection between each air conditioning unit and its adjacent unit groups, based on the outdoor unit fin temperature of each of the air conditioning units participating in heating, coordinated defrosting between each air conditioning unit and its adjacent unit groups can be achieved. This enables coordinated defrosting between adjacent systems when multiple air conditioning units are heating, saving the heat generated during the defrosting process of multiple air conditioning units, effectively reducing heating energy consumption, and reducing the possibility of insufficient heat supply at the user end.

[0060] In some implementations, step S130 controls the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet 11 of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets 12 of each air conditioning unit based on the outdoor unit fin temperature of each of the air conditioning units participating in heating, so as to realize the coordinated defrosting between each air conditioning unit and its adjacent unit group, specifically including: controlling the first unit to enter the defrosting process.

[0061] The following is combined with Figure 2 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention for controlling the first unit to enter defrost mode. It further illustrates the specific process of controlling the first unit to enter defrost mode in step S130, including steps S210 to S220.

[0062] Step S210: For any one of the air conditioning units participating in heating, if the outdoor unit fin temperature of any one of the air conditioning units participating in heating is lower than the preset defrost entry temperature, then that air conditioning unit is determined as the first unit. Specifically, any air conditioning unit whose outdoor unit fin temperature is lower than the preset defrost entry temperature is recorded as the first unit; the outdoor unit fan of the first unit is controlled to be turned off, and the main air outlet 11 of the outdoor unit fan of the first unit is also controlled to be turned off, so that the first unit enters the defrost mode; the first unit that has entered the defrost mode is recorded as any one of the air conditioning units participating in defrost.

[0063] Step S220: For any one of the air conditioning units participating in defrosting, if the outdoor unit fin temperature of any one of the air conditioning units participating in defrosting rises to a preset defrost exit temperature, then that air conditioning unit is determined as the second unit, so as to control the second unit and its adjacent unit group to perform coordinated defrosting. Specifically, any one of the air conditioning units participating in defrosting whose outdoor unit fin temperature rises to the preset defrost exit temperature is recorded as the second unit.

[0064] Specifically, in combination Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown in the example, in the solution of the present invention, the control method for a multi-system air conditioning unit with coordinated defrosting includes:

[0065] Step 1: During the heating process of the multi-system air conditioning unit, the outdoor unit fan is turned on, the side air outlets 12 of all outdoor unit fan outlets 1 are closed, the main air outlet 11 is opened, and the cooling capacity is directly discharged into the air. Then, Step 2 can be performed.

[0066] Step 2: When the defrosting temperature of one of the outdoor units (referred to as the first outdoor unit) participating in the heating process is detected to be lower than the user-preset defrosting start temperature, the system determines that the fins of the first outdoor unit are frosted, and puts the first outdoor unit into defrosting mode. At this time, the fan of the first outdoor unit is turned off, and all air outlets of the first outdoor unit's air outlet device 1 (i.e., the main air outlet 11 and the side air outlet 12) are closed, so that the internal temperature of the fins of the first outdoor unit rises to melt the frost layer. Then, step 3 can be executed. Here, the defrosting temperature refers to the fin temperature of the first outdoor unit measured by a temperature sensor placed at the center of the front fins 14 of the outdoor unit.

[0067] Step 3: When the system detects that the defrosting temperature of one of the outdoor units (referred to as the second outdoor unit) in the defrosting mode has risen to the preset defrosting exit temperature, it determines that the defrosting process of the second outdoor unit is complete, and then Step 4 can be executed.

[0068] In the present invention, during the heating operation of the multi-split air conditioning system, when the temperature of the outdoor unit fins of any of the air conditioning units participating in heating is lower than the preset defrost entry temperature, the system enters defrost mode and controls the outdoor fan to shut down for defrosting. When the temperature of the outdoor unit fins of any of the air conditioning units participating in defrost rises to the preset defrost exit temperature, defrosting is determined to be complete. This allows the remaining heat stored inside the outdoor unit of the defrosted unit to be transferred to the vicinity of the outdoor unit fins of nearby systems to delay the frosting of nearby units. This achieves coordinated defrosting between adjacent systems when the multi-system air conditioning units are heating, saving the heat generated during the defrosting process of the multi-system air conditioning units, effectively reducing heating energy consumption, and reducing the possibility of insufficient heat supply at the user end.

[0069] In some implementations, step S130 controls the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet 11 of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets 12 of each air conditioning unit based on the outdoor unit fin temperature of each of the air conditioning units participating in heating, so as to realize the coordinated defrosting between each air conditioning unit and its adjacent unit group. Specifically, it also includes controlling the process of the second unit coordinating with the third unit for defrosting.

[0070] The following is combined with Figure 3 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention for controlling the second unit to cooperate with the third unit in defrosting. It further illustrates the specific process of controlling the second unit to cooperate with the third unit in defrosting in step S130, including steps S310 to S320.

[0071] Step S310: After determining the second unit, determine the outdoor unit fin temperature of each air conditioning unit in the adjacent unit group of the second unit. Specifically, if a communication connection between each air conditioning unit and its adjacent unit group is pre-established, the second unit initiates a communication request to the adjacent unit group of the second unit to obtain the outdoor unit fin temperature of each air conditioning unit in the adjacent unit group of the second unit. Then, determine the air conditioning unit with the lowest outdoor unit fin temperature in the adjacent unit group of the second unit as the third unit. Specifically, determine the air conditioning unit with the lowest outdoor unit fin temperature among all the air conditioning units in the adjacent unit group of the second unit as the third unit.

[0072] Step S320: Control the outdoor unit fan of the second unit to turn on, control at least one of the side air outlets 12 of the second unit that is pre-associated with the third unit to turn on, and control each of the at least one side air outlet 12 to discharge air at an air outlet angle pre-associated with the third unit, so as to blow the defrosting heat of the outdoor unit fins of the second unit to the outdoor unit fins of the third unit, so that the second unit and the third unit can perform collaborative defrosting. Specifically, this can involve controlling the outdoor unit fan of the second unit to start, after establishing a communication connection between each air conditioning unit and its adjacent unit groups in advance; and, based on the communication connection between the second unit and the third unit, controlling at least one side air outlet 12 of the second unit that is pre-associated with the third unit to open, and controlling each of the at least one side air outlet 12 to discharge air at an air outlet angle pre-associated with the third unit, so as to blow the defrosting heat of the outdoor unit fins of the second unit to the outdoor unit fins of the third unit; that is, controlling the first... When the outdoor unit fans of the two units are turned on, according to the pre-established communication connection between the second unit and the third unit, the side air outlets 12 of the second unit pre-bound to the third unit and the air outlet angle are controlled to open. At least one of the side air outlets 12 of the second unit pre-bound to the third unit is controlled to open, and each of the at least one side air outlet 12 is controlled to emit air at the air outlet angle pre-bound to the third unit, so as to blow the defrosting heat of the outdoor unit fins of the second unit to the outdoor unit fins of the third unit, so that the second unit and the third unit can perform collaborative defrosting.

[0073] Specifically, in combination Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown in the example, the control method for a multi-system air conditioning unit with coordinated defrosting in the present invention further includes:

[0074] In step 3, when the system detects that the defrosting temperature of one of the outdoor units (referred to as the second outdoor unit) in all the outdoor units that have entered defrosting mode has risen to the preset defrosting exit temperature, it determines that the defrosting process is complete. At this time, the second outdoor unit initiates communication with all its adjacent outdoor units in sequence to detect the defrosting temperature on the fins of each of the adjacent outdoor units of the second outdoor unit, and finds the adjacent outdoor unit with the lowest defrosting temperature among each of the adjacent outdoor units of the second outdoor unit. Then, step 4 can be executed.

[0075] Among them, all adjacent outdoor units of the second outdoor unit refer to the outdoor units that are already bound to the second outdoor unit. Outdoor units that are not bound to the second outdoor unit do not initiate communication with it because the air outlet and air outlet angle of the air outlet device 1 are uncertain. During installation, the installer should bind all other outdoor units that can be reached by the side air outlet of each outdoor unit, such as outdoor unit A, to each outdoor unit.

[0076] Step 4: Open the corresponding air outlet of the second outdoor unit according to the side air outlet and air outlet angle pre-bound to the adjacent outdoor unit N with the lowest defrosting temperature, and adjust the air outlet angle (according to the air outlet and angle set after the installation is completed by the installer). Turn on the fan of the second outdoor unit so that the second outdoor unit blows the heat inside the fins to the outdoor unit N to alleviate the frosting situation of the outdoor unit N. Then you can proceed to step 5.

[0077] In the present invention, after determining the second unit, the air conditioning unit with the lowest outdoor unit fin temperature among the adjacent units of the second unit is determined as the third unit. The outdoor unit fan of the second unit is controlled to blow the defrosting heat of the outdoor unit fins of the second unit to the outdoor unit fins of the third unit. The remaining heat stored inside the outdoor unit of the second unit is transferred to the vicinity of the outdoor unit fins of the third unit to delay the frosting of nearby units. This realizes that when multiple air conditioning units are heating, adjacent systems can cooperate in defrosting, saving the heat generated during the defrosting process of multiple air conditioning units, effectively reducing the energy consumption of heating, and reducing the situation of insufficient heat supply at the user end.

[0078] In some embodiments, step S130 controls the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet 11 of the outdoor unit fan, and the opening and closing of at least one side air outlet 12 and the air outlet angle of each of the air conditioning units participating in heating, based on the outdoor unit fin temperature of each of the air conditioning units participating in heating, to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group. Specifically, it also includes the process of controlling the second unit to exit the defrosting mode, as follows: during the process of blowing the defrosting heat from the outdoor unit fins of the second unit to the outdoor unit fins of the third unit, if the outdoor unit fin temperature of the second unit is lower than the preset coordinated defrosting temperature, then all the side air outlets 12 of the outdoor unit fan of the second unit are closed, and the main air outlet 11 of the outdoor unit fan of the second unit is opened, so that the second unit exits the defrosting mode and participates in the heating operation of the multi-split system; wherein, the preset coordinated defrosting temperature is greater than the preset defrosting entry temperature and less than the preset defrosting exit temperature.

[0079] Specifically, in combination Figure 5 , Figure 6 , Figure 7 and Figure 8As shown in the example, the control method for a multi-system air conditioning unit with coordinated defrosting in the present invention further includes:

[0080] Step 5: When the defrost temperature of the second outdoor unit is lower than the user-preset collaborative defrost temperature, close all side air outlets 12 of the air outlet device 1 of the second outdoor unit, open the main air outlet 11 of the air outlet device 1 of the second outdoor unit, and enter the normal heating mode. Wherein, the preset defrost entry temperature < the user-preset collaborative defrost temperature, the preset defrost entry temperature < 0℃, and the user-preset collaborative defrost temperature > 4℃.

[0081] The present invention addresses multi-system air conditioning units by adding an air outlet device 1 to the upper part of each outdoor unit. The air outlet of the air outlet device 1 includes a main air outlet 11 and four side air outlets 12. When multiple outdoor units participate in the heating process, the system responds according to the defrosting temperature of adjacent units around any outdoor unit. After defrosting any outdoor unit, the system blows heat to the fins of adjacent outdoor units. When one outdoor unit is defrosting, it can assist other nearby outdoor units in defrosting. This reduces the defrosting frequency of the unit and lowers the overall defrosting frequency through coordinated defrosting between adjacent outdoor units, thereby saving energy.

[0082] The technical solution of this embodiment involves adding an air outlet device 1 to the upper part of the outdoor unit fan of each system in a multi-split air conditioning system (such as a multi-system air conditioning unit). This air outlet device 1 includes a main air outlet 11 and four side air outlets 12. When the main air outlet 11 is opened, air is discharged vertically upwards, and when the side air outlets 12 are opened, air is discharged downwards at a set angle. All other outdoor units that can be reached by the side air outlets 12 of each outdoor unit are bound to each of these outdoor units (i.e., a communication association is established). During the heating process of the multi-split air conditioning system, for all units participating in heating, the outdoor unit fan of each unit is controlled to open, the main air outlet 11 of each unit is opened, and all side air outlets 12 are closed. When any unit needs defrosting, the outdoor unit fan of that unit is turned off. Close the main air outlet 11 of the unit; after any unit completes defrosting, for the unit with the lowest defrosting temperature among all adjacent outdoor units bound to that unit, turn on the fan of that outdoor unit, so that the outdoor unit opens the corresponding air outlet according to the side air outlet and air outlet angle pre-bound to the adjacent outdoor unit with the lowest defrosting temperature and adjusts the air outlet angle to alleviate the billing situation of the adjacent outdoor unit with the lowest defrosting temperature; when the defrosting temperature of any outdoor unit is lower than the user-preset collaborative defrosting temperature, close all side air outlets 12 of that outdoor unit and open the main air outlet 11 of that outdoor unit for normal heating; thus, by enabling adjacent systems to defrost collaboratively during the heating of the multi-split system, the heat generated during the defrosting process of the multi-split system can be saved and the energy consumption of the multi-split system for heating can be reduced.

[0083] According to embodiments of the present invention, a control device for a multi-split air conditioning system, corresponding to a control method for a multi-split air conditioning system, is also provided. See also... Figure 4 The diagram shows a structural schematic of an embodiment of the device of the present invention. The multi-split air conditioning system includes: air conditioning units, the number of which is two or more; each of the two or more air conditioning units has outdoor unit fins and an outdoor unit fan, each outdoor unit fan has a main air outlet 11 and a side air outlet 12, the main air outlet 11 and the side air outlet 12 have different air outlet directions, preferably the side air outlet 12 is located to the side of the main air outlet 11; the number of side air outlets 12 is one or more, and the different side air outlets 12 also have different air outlet directions; both the main air outlet 11 and the side air outlet 12 can be opened or closed, and the air outlet angle of the side air outlet 12 can be adjusted. In the solution of the present invention, as... Figure 4 As shown, the control device of the multi-unit system includes: an acquisition unit 102 and a control unit 104.

[0084] The control unit 104 is configured to control the heating operation of the multi-split system. For two or more air conditioning units, when the multi-split system is in heating operation, it controls the outdoor unit fan of each of the participating air conditioning units to turn on, and controls the main air outlet 11 of each outdoor unit fan to open while all side air outlets 12 are closed. The specific functions and processing of this control unit 104 are described in step S110.

[0085] The acquisition unit 102 is configured to acquire the outdoor unit fin temperature of each of the air conditioning units participating in heating, specifically the fin temperature at the center position of the front side of the outdoor unit fins of each air conditioning unit, when all the air conditioning units participating in heating are in heating operation. The specific function and processing of this acquisition unit 102 are described in step S120.

[0086] The control unit 104 is further configured to control the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet 11 of the outdoor unit fan, and the opening and closing of at least one of the side air outlets 12 and their air outlet angles, based on the outdoor unit fin temperature of each of the air conditioning units participating in heating, thereby achieving coordinated defrosting between each air conditioning unit and its adjacent unit group. The adjacent unit group includes combinations of air conditioning units in which at least one other outdoor unit fan can be reached by at least one of the air outlet angles of one or more of the side air outlets 12 of the outdoor unit fan of each air conditioning unit. The other outdoor unit fan refers to any outdoor unit fan in the multi-split system other than the outdoor unit fan of each air conditioning unit itself. The specific functions and processing of the control unit 104 are further described in step S130.

[0087] In the solution of this invention, for multi-system air conditioning units, each system can, after defrosting itself, transfer the remaining heat stored inside its own outdoor unit to the vicinity of the outdoor unit fins of nearby systems to delay the frosting of nearby units; thereby, when the multi-system air conditioning unit is heating, adjacent systems can cooperate in defrosting, which can save the heat generated during the defrosting process of the multi-system air conditioning unit, thereby effectively reducing the energy consumption of heating and reducing the situation of insufficient heat supply at the user end.

[0088] In some embodiments, each of the air conditioning units further includes an air outlet device 1, i.e., an air outlet device 1 disposed at the air outlet position of the outdoor unit fan; in each of the air conditioning units, the air outlet device 1 is disposed at the air outlet position of the outdoor unit fan, preferably the air outlet device 1 is disposed on the upper part or top of the outdoor unit fan; the main air outlet 11 is disposed on the upper part or top of the air outlet device 1, and one or more side air outlets 12 are disposed on the side of the air outlet device 1; that is, the air outlet device 1 has a main air outlet 11 and a side air outlet 12, the main air outlet 11 and the side air outlet 12 have different air outlet directions, preferably the side air outlet 12 is located on the side of the main air outlet 11.

[0089] When the air outlet device 1 is vertically arranged, the main air outlet 11 opens and the air is discharged vertically upwards towards the air outlet device 1. When one or more of the side air outlets 12 are open, the air is discharged downwards towards the side of the air outlet device 1 at a set angle.

[0090] Figure 5 This is a schematic diagram of the air outlet device 1, where (a) is a top view, (b) is a front view, and (c) is a side view. Figure 6This is a structural schematic diagram showing the installation location of the air outlet device 1, where (a) is a top view and (b) is a front view. In this invention, for each system in a multi-system air conditioning unit, an air outlet device 1 is added to the upper part of the outdoor unit fan of each system. The structure of the air outlet device 1 is as follows... Figure 5 As shown, the air outlet device 1 has an air outlet, which includes a main air outlet 11 and four side air outlets 12.

[0091] Among them, control such as Figure 5 The main air outlet 11 shown above blows air vertically upwards. The system can control the opening and closing of the main air outlet 11. Since the outdoor unit fan blows cold air for most of the heating process, blowing it outwards would accelerate the frosting process of surrounding units. Therefore, blowing air vertically upwards through the main air outlet 11 during normal heating can improve the heat exchange efficiency of the outdoor unit without affecting surrounding units. The system can control the opening and closing of the main air outlet 11 through electrical control, such as controlling the air guide vanes to fully close or open, or adding a damper device to control whether the damper device blocks or does not block the main air outlet 11. It should be noted that the angle of the main air outlet 11 cannot be adjusted; it must either be closed or blow air vertically upwards.

[0092] Control such as Figure 5 The side air outlet 12 shown directs airflow downwards at a set angle. Because the outdoor unit stores some hot air for a short period immediately after defrosting, directing the airflow downwards at the set angle from the side air outlet 12 delivers this heat to the surrounding unit's fins, delaying the frosting process on those units. The set angle is typically 45°, but can be adjusted based on the actual height of the unit's fins. This adjustment depends on the unit's specific structure and the installation distance between adjacent units. The adjusted angle should ensure that an installer can feel the airflow from the side of the blower unit when placing their hand near the fins of the unit being blew on.

[0093] The side air outlet 12 can be a louvered air outlet. The louvers on the side air outlet 12 allow control of the left and right angle of the airflow. The system can control the opening and closing of the side air outlet 12, and when the side air outlet 12 is open, the left and right airflow angle can be controlled. Once the outdoor unit fan of a specific target unit model is selected, the left and right airflow angle will not change until it is closed.

[0094] The installation location of the air outlet device 1 is as follows: Figure 6 As shown. Figure 6As shown, the outdoor unit fins are positioned between the main unit 3 and the fan 2, and the air outlet device 1 is located above the fan 2. The side of the outdoor unit fins is shown as side fin 13, and the front of the outdoor unit fins is shown as front fin 14. A temperature sensor is placed at the center of the front fin 14 to measure the defrosting temperature of the outdoor unit.

[0095] In the present invention, by setting an air outlet device 1 on the upper part of the outdoor unit fan of each system, and setting a main air outlet 11 and one or more side air outlets 12 on the air outlet device 1, air can be reliably discharged using the main air outlet 11 in heating mode, and the main air outlet 11 can be closed in defrosting mode. The number of side air outlets 12 to be opened and the air outlet angle when they are open can be flexibly selected. This makes it convenient for each system to transfer the remaining heat stored inside its own outdoor unit to the vicinity of the outdoor unit fins of nearby systems after defrosting, so as to delay the frosting of nearby units. This realizes that when multiple air conditioning units are heating, adjacent systems can cooperate in defrosting, saving the heat generated during the defrosting process of multiple air conditioning units, effectively reducing the energy consumption of heating, and reducing the situation of insufficient heat supply at the user end.

[0096] In some embodiments, the control device for the multi-split air conditioning system described in the present invention further includes: the control unit 104 is further configured to, before controlling the heating operation of the multi-split air conditioning system, pre-establish a communication connection between each of the two or more air conditioning units and its adjacent unit group, preferably pre-establishing a communication connection between the outdoor unit of each air conditioning unit and the outdoor units of its adjacent unit group; specifically, for each air conditioning unit, controlling all air outlets 12 of one or more of the side air outlets 12 of the outdoor unit fan of each air conditioning unit. A group of units containing at least one outdoor unit fan that can be blown by at least one of the other air conditioning units at an air outlet angle is denoted as the adjacent unit group of each air conditioning unit; a communication connection is pre-established between each air conditioning unit and the adjacent unit group of each air conditioning unit, preferably a communication connection is pre-established between the outdoor unit fan of each air conditioning unit and the outdoor unit fans in the adjacent unit group of each air conditioning unit; wherein, the other air conditioning units are all the air conditioning units other than each air conditioning unit in two or more air conditioning units.

[0097] The communication connection between each air conditioning unit and its adjacent unit group includes: a communication link between each air conditioning unit and any air conditioning unit in its adjacent unit group, and at least one side air outlet 12 of each air conditioning unit that is pre-associated with any air conditioning unit in its adjacent unit group, and the air outlet angle of each side air outlet 12 that is pre-associated with any air conditioning unit in its adjacent unit group.

[0098] Accordingly, the control unit 104 controls the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet 11 of the outdoor unit fan, and the opening and closing of at least one side air outlet 12 and the air outlet angle of each air conditioning unit based on the outdoor unit fin temperature of each air conditioning unit participating in heating, thereby achieving coordinated defrosting between each air conditioning unit and its adjacent unit groups. Specifically, the control unit 104 is further configured to, in conjunction with the communication connection between each air conditioning unit and its adjacent unit groups, control the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet 11 of the outdoor unit fan, and the opening and closing of at least one side air outlet 12 and the air outlet angle of each air conditioning unit based on the outdoor unit fin temperature of each air conditioning unit participating in heating, thereby achieving coordinated defrosting between each air conditioning unit and its adjacent unit groups.

[0099] Specifically, after the outdoor unit is installed, the user or installer needs to manually bind the air outlet and air outlet angle of the corresponding air outlet device 1 of the adjacent outdoor unit on the air conditioner operator. The binding is divided into two cases: the air outlet directly facing the air outlet device 1 and the air outlet not directly facing the air outlet device 1. The following is an example of outdoor unit A, and an adjacent outdoor unit B or an adjacent outdoor unit C of outdoor unit A.

[0100] The first scenario: directly facing the air outlet of air outlet device 1. For details, please refer to [reference needed]. Figure 7 The example shown, Figure 7 This diagram illustrates the defrosting and airflow status of a system facing a side air outlet. When an adjacent outdoor unit B of outdoor unit A is facing the first side air outlet of outdoor unit A, outdoor unit B is attached to the first side air outlet of outdoor unit A. The airflow angle of the first side air outlet is 90°, meaning the first side air outlet blows air vertically.

[0101] There are two methods for binding outdoor unit B to the first side air outlet of outdoor unit A: one method requires each outdoor unit to have an individual display for binding settings of the air outlet and air outlet angle; the other method uses group control to bind settings of the air outlet and air outlet angle of each outdoor unit. After the installer installs outdoor unit A and outdoor unit B, the binding settings of outdoor unit B's air outlet and air outlet angle are configured using the above method. The settings are: outdoor unit B, air outlet angle of the first side air outlet is 90°.

[0102] The second scenario: The air outlet is not directly facing the air outlet device 1. For details, please refer to... Figure 8 The example shown, Figure 8 This diagram illustrates the defrosting airflow status of a system that is not directly facing the air outlet. When an adjacent outdoor unit C of outdoor unit A is not directly facing any side air outlet 12 of outdoor unit A, then outdoor unit A must have two air outlets (side air outlets) that can blow air towards outdoor unit C at an angle. Assuming that the second and third side air outlets of outdoor unit A blow air towards outdoor unit C at an angle, then outdoor unit C is bound to the corresponding angles of the second and third side air outlets of outdoor unit A.

[0103] The outdoor unit C is bound to the corresponding angles of the second and third side air outlets of the outdoor unit A. This includes adjusting the left and right angles, similar to adjusting the up and down angles. The installer can adjust these angles by hand after installation. For example, if the outdoor unit A has a first, second, third, and fourth side air outlet corresponding to the four cardinal directions (north, south, east, and west), and the adjacent outdoor unit C is to the southeast of outdoor unit A, then neither the western (third) side air outlet nor the northern (fourth) side air outlet will be able to reach outdoor unit C. After installation, the installer will set the following information using the method described above: outdoor unit C, first side air outlet angle 45°, second side air outlet angle 135°.

[0104] In the present invention, by pre-establishing a communication connection between each of the two or more air conditioning units and its adjacent unit groups, and then combining the communication connection between each air conditioning unit and its adjacent unit groups, based on the outdoor unit fin temperature of each of the air conditioning units participating in heating, coordinated defrosting between each air conditioning unit and its adjacent unit groups can be achieved. This enables coordinated defrosting between adjacent systems when multiple air conditioning units are heating, saving the heat generated during the defrosting process of multiple air conditioning units, effectively reducing heating energy consumption, and reducing the possibility of insufficient heat supply at the user end.

[0105] In some embodiments, the control unit 104 controls the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet 11 of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets 12 of each air conditioning unit participating in heating, based on the outdoor unit fin temperature of each air conditioning unit participating in heating, to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group. Specifically, this includes controlling the first unit to enter the defrosting process, as follows:

[0106] The control unit 104 is further configured to, for any one of the air conditioning units participating in heating, if the outdoor unit fin temperature of any one of the air conditioning units participating in heating is lower than a preset defrost entry temperature, then determine that any one of the air conditioning units as the first unit. Specifically, any air conditioning unit whose outdoor unit fin temperature is lower than the preset defrost entry temperature is recorded as the first unit; the outdoor unit fan of the first unit is controlled to shut down, and the main air outlet 11 of the outdoor unit fan of the first unit is also controlled to shut down, so that the first unit enters defrost mode; the first unit that has entered defrost mode is recorded as any one of the air conditioning units participating in defrost. The specific functions and processing of this control unit 104 are also described in step S210.

[0107] The control unit 104 is further configured to, for any one of the air conditioning units participating in defrosting, if the outdoor unit fin temperature of any one of the air conditioning units participating in defrosting rises to a preset defrost exit temperature, then determine that any one of the air conditioning units as the second unit, so as to control the second unit to perform coordinated defrosting with its adjacent unit group. Specifically, any air conditioning unit whose outdoor unit fin temperature rises to the preset defrost exit temperature among all the air conditioning units participating in defrosting is recorded as the second unit. The specific functions and processing of this control unit 104 are also described in step S220.

[0108] Specifically, in combination Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown in the example, in the solution of the present invention, the control method for a multi-system air conditioning unit with coordinated defrosting includes:

[0109] Step 1: During the heating process of the multi-system air conditioning unit, the outdoor unit fan is turned on, the side air outlets 12 of all outdoor unit fan outlets 1 are closed, the main air outlet 11 is opened, and the cooling capacity is directly discharged into the air. Then, Step 2 can be performed.

[0110] Step 2: When the defrosting temperature of one of the outdoor units (referred to as the first outdoor unit) participating in the heating process is detected to be lower than the user-preset defrosting start temperature, the system determines that the fins of the first outdoor unit are frosted, and puts the first outdoor unit into defrosting mode. At this time, the fan of the first outdoor unit is turned off, and all air outlets of the first outdoor unit's air outlet device 1 (i.e., the main air outlet 11 and the side air outlet 12) are closed, so that the internal temperature of the fins of the first outdoor unit rises to melt the frost layer. Then, step 3 can be executed. Here, the defrosting temperature refers to the fin temperature of the first outdoor unit measured by a temperature sensor placed at the center of the front fins 14 of the outdoor unit.

[0111] Step 3: When the system detects that the defrosting temperature of one of the outdoor units (referred to as the second outdoor unit) in the defrosting mode has risen to the preset defrosting exit temperature, it determines that the defrosting process of the second outdoor unit is complete, and then Step 4 can be executed.

[0112] In the present invention, during the heating operation of the multi-split air conditioning system, when the temperature of the outdoor unit fins of any of the air conditioning units participating in heating is lower than the preset defrost entry temperature, the system enters defrost mode and controls the outdoor fan to shut down for defrosting. When the temperature of the outdoor unit fins of any of the air conditioning units participating in defrost rises to the preset defrost exit temperature, defrosting is determined to be complete. This allows the remaining heat stored inside the outdoor unit of the defrosted unit to be transferred to the vicinity of the outdoor unit fins of nearby systems to delay the frosting of nearby units. This achieves coordinated defrosting between adjacent systems when the multi-system air conditioning units are heating, saving the heat generated during the defrosting process of the multi-system air conditioning units, effectively reducing heating energy consumption, and reducing the possibility of insufficient heat supply at the user end.

[0113] In some embodiments, the control unit 104 controls the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet 11 of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets 12 of each of the air conditioning units participating in heating, based on the outdoor unit fin temperature of each air conditioning unit participating in heating, to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group. Specifically, it also includes controlling the process of the second unit coordinating with the third unit for defrosting, as follows:

[0114] The control unit 104 is further configured to, after determining the second unit, determine the outdoor unit fin temperature of each air conditioning unit in the adjacent unit group of the second unit. Specifically, this can be achieved by, after establishing a communication connection between each air conditioning unit and its adjacent unit group, causing the second unit to initiate a communication request to the adjacent unit group of the second unit to obtain the outdoor unit fin temperature of each air conditioning unit in the adjacent unit group of the second unit; and to determine the air conditioning unit with the lowest outdoor unit fin temperature in the adjacent unit group of the second unit as the third unit. Specifically, this involves determining the air conditioning unit with the lowest outdoor unit fin temperature among all the air conditioning units in the adjacent unit group of the second unit as the third unit. The specific functions and processing of this control unit 104 are further described in step S310.

[0115] The control unit 104 is further configured to control the outdoor unit fan of the second unit to turn on, control at least one of the side air outlets 12 of the second unit that is pre-associated with the third unit to turn on, and control each of the at least one side air outlet 12 to discharge air at an air outlet angle pre-associated with the third unit, so as to blow the defrosting heat of the outdoor unit fins of the second unit to the outdoor unit fins of the third unit, so that the second unit and the third unit can perform collaborative defrosting. The specific functions and processing of the control unit 104 are also described in step S320. Specifically, this can involve controlling the outdoor unit fan of the second unit to start, after establishing a communication connection between each air conditioning unit and its adjacent unit groups in advance; and, based on the communication connection between the second unit and the third unit, controlling at least one side air outlet 12 of the second unit that is pre-associated with the third unit to open, and controlling each of the at least one side air outlet 12 to discharge air at an air outlet angle pre-associated with the third unit, so as to blow the defrosting heat of the outdoor unit fins of the second unit to the outdoor unit fins of the third unit; that is, controlling the first... When the outdoor unit fans of the two units are turned on, according to the pre-established communication connection between the second unit and the third unit, the side air outlets 12 of the second unit pre-bound to the third unit and the air outlet angle are controlled to open. At least one of the side air outlets 12 of the second unit pre-bound to the third unit is controlled to open, and each of the at least one side air outlet 12 is controlled to emit air at the air outlet angle pre-bound to the third unit, so as to blow the defrosting heat of the outdoor unit fins of the second unit to the outdoor unit fins of the third unit, so that the second unit and the third unit can perform collaborative defrosting.

[0116] Specifically, in combination Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown in the example, the control method for a multi-system air conditioning unit with coordinated defrosting in the present invention further includes:

[0117] In step 3, when the system detects that the defrosting temperature of one of the outdoor units (referred to as the second outdoor unit) in all the outdoor units that have entered defrosting mode has risen to the preset defrosting exit temperature, it determines that the defrosting process is complete. At this time, the second outdoor unit initiates communication with all its adjacent outdoor units in sequence to detect the defrosting temperature on the fins of each of the adjacent outdoor units of the second outdoor unit, and finds the adjacent outdoor unit with the lowest defrosting temperature among each of the adjacent outdoor units of the second outdoor unit. Then, step 4 can be executed.

[0118] Among them, all adjacent outdoor units of the second outdoor unit refer to the outdoor units that are already bound to the second outdoor unit. Outdoor units that are not bound to the second outdoor unit do not initiate communication with it because the air outlet and air outlet angle of the air outlet device 1 are uncertain. During installation, the installer should bind all other outdoor units that can be reached by the side air outlet of each outdoor unit, such as outdoor unit A, to each outdoor unit.

[0119] Step 4: Open the corresponding air outlet of the second outdoor unit according to the side air outlet and air outlet angle pre-bound to the adjacent outdoor unit N with the lowest defrosting temperature, and adjust the air outlet angle (according to the air outlet and angle set after the installation is completed by the installer). Turn on the fan of the second outdoor unit so that the second outdoor unit blows the heat inside the fins to the outdoor unit N to alleviate the frosting situation of the outdoor unit N. Then you can proceed to step 5.

[0120] In the present invention, after determining the second unit, the air conditioning unit with the lowest outdoor unit fin temperature among the adjacent units of the second unit is determined as the third unit. The outdoor unit fan of the second unit is controlled to blow the defrosting heat of the outdoor unit fins of the second unit to the outdoor unit fins of the third unit. The remaining heat stored inside the outdoor unit of the second unit is transferred to the vicinity of the outdoor unit fins of the third unit to delay the frosting of nearby units. This realizes that when multiple air conditioning units are heating, adjacent systems can cooperate in defrosting, saving the heat generated during the defrosting process of multiple air conditioning units, effectively reducing the energy consumption of heating, and reducing the situation of insufficient heat supply at the user end.

[0121] In some embodiments, the control unit 104 controls the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet 11 of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets 12 of each of the air conditioning units participating in heating, based on the outdoor unit fin temperature of each air conditioning unit participating in heating, to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group. Specifically, it also includes controlling the second unit to exit the defrosting mode, as follows:

[0122] The control unit 104 is further configured to, during the process of blowing the defrosting heat from the outdoor unit fins of the second unit to the outdoor unit fins of the third unit, if the temperature of the outdoor unit fins of the second unit is lower than a preset collaborative defrosting temperature, control all the side air outlets 12 of the outdoor unit fan of the second unit to close and open the main air outlet 11 of the outdoor unit fan of the second unit, so that the second unit exits the defrosting mode and participates in the heating operation of the multi-split system; wherein, the preset collaborative defrosting temperature is greater than the preset defrosting entry temperature and less than the preset defrosting exit temperature.

[0123] Specifically, in combination Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown in the example, the control method for a multi-system air conditioning unit with coordinated defrosting in the present invention further includes:

[0124] Step 5: When the defrost temperature of the second outdoor unit is lower than the user-preset collaborative defrost temperature, close all side air outlets 12 of the air outlet device 1 of the second outdoor unit, open the main air outlet 11 of the air outlet device 1 of the second outdoor unit, and enter the normal heating mode. Wherein, the preset defrost entry temperature < the user-preset collaborative defrost temperature, the preset defrost entry temperature < 0℃, and the user-preset collaborative defrost temperature > 4℃.

[0125] The present invention addresses multi-system air conditioning units by adding an air outlet device 1 to the upper part of each outdoor unit. The air outlet of the air outlet device 1 includes a main air outlet 11 and four side air outlets 12. When multiple outdoor units participate in the heating process, the system responds according to the defrosting temperature of adjacent units around any outdoor unit. After defrosting any outdoor unit, the system blows heat to the fins of adjacent outdoor units. When one outdoor unit is defrosting, it can assist other nearby outdoor units in defrosting. This reduces the defrosting frequency of the unit and lowers the overall defrosting frequency through coordinated defrosting between adjacent outdoor units, thereby saving energy.

[0126] Since the processing and functions implemented by the device in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0127] According to an embodiment of the present invention, a multi-split air conditioning system corresponding to a control device for a multi-split air conditioning system is also provided. This multi-split air conditioning system may include the control device for a multi-split air conditioning system described above.

[0128] Since the processing and functions implemented by the multi-unit system in this embodiment are basically the same as those of the aforementioned device embodiments, principles and examples, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0129] According to an embodiment of the present invention, a computer program product corresponding to a multi-unit air conditioning system is also provided, including a computer program that, when executed by a processor, implements the steps of the control method for the multi-unit air conditioning system described above.

[0130] Since the processing and functions implemented by the product in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned multi-split air conditioning system, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0131] According to an embodiment of the present invention, a storage medium corresponding to a control method for a multi-split air conditioning system is also provided. The storage medium includes a stored program, wherein, when the program is executed, the device where the storage medium is located executes the steps of the control method for the multi-split air conditioning system described above.

[0132] Since the processing and functions implemented by the storage medium in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0133] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous methods can be freely combined and superimposed.

[0134] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A control method for a multi-unit air conditioning system, characterized in that, The multi-split air conditioning system includes: air conditioning units, wherein the number of air conditioning units is two or more; each air conditioning unit has outdoor unit fins and an outdoor unit fan; each air conditioning unit also has an air outlet device (1); in each air conditioning unit, the air outlet device (1) is located at the air outlet position of the outdoor unit fan; the air outlet device (1) includes a main air outlet (11) and four side air outlets (12); the main air outlet (11) and the side air outlets (12) have different air outlet directions; the air outlet directions of the different side air outlets (12) are also different; both the main air outlet (11) and the side air outlets (12) can be opened or closed, and the air outlet angle of the side air outlets (12) can be adjusted; the control method of the multi-split air conditioning system includes: When the multi-split system is in heating operation, for all the air conditioning units participating in heating, the outdoor fan of each air conditioning unit is controlled to open, and the main air outlet (11) of the outdoor fan of each air conditioning unit is controlled to open, and all the side air outlets (12) are closed. Obtain the outdoor unit fin temperature of each of the air conditioning units participating in heating; Based on the fin temperature of the outdoor unit of each of the air conditioning units participating in the heating process, the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet (11) of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets (12) of each air conditioning unit are controlled to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group; Coordinated defrosting refers to responding to the defrosting temperature of the adjacent units around any outdoor unit when multiple outdoor units participate in the heating process, and blowing the heat generated during the defrosting process to the fins of the adjacent outdoor units that are bound to the outdoor unit after the defrosting of any outdoor unit is completed, so as to assist other nearby outdoor units in defrosting when one outdoor unit is defrosting; The adjacent unit group includes: a combination of at least one other outdoor unit fan in the air conditioning unit whose air outlet (12) of one or more of the side air outlets (12) of the outdoor unit fan of each of the air conditioning units has at least one air outlet angle that can blow on the air of the air conditioning unit.

2. The control method for a multi-unit air conditioning system according to claim 1, characterized in that, The main air outlet (11) is located on the upper part or top of the air outlet device (1), and one or more side air outlets (12) are located on the side of the air outlet device (1). When the air outlet device (1) is vertically set, when the main air outlet (11) is open, the air outlet is vertically directed upwards towards the air outlet device (1), and when one or more of the side air outlets (12) are open, the air outlets are directed downwards towards the side of the air outlet device (1) at a set angle.

3. The control method for a multi-unit air conditioning system according to claim 1 or 2, characterized in that, Also includes: For each of the two or more air conditioning units, a communication connection between each air conditioning unit and its adjacent unit group is established in advance; The communication connection between each air conditioning unit and its adjacent unit group includes: a communication link between each air conditioning unit and any air conditioning unit in its adjacent unit group, and at least one side air outlet (12) of each air conditioning unit pre-associated with any air conditioning unit in its adjacent unit group, and the air outlet angle of each side air outlet (12) pre-associated with any air conditioning unit in its adjacent unit group; Based on the fin temperature of the outdoor unit of each of the air conditioning units participating in heating, the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet (11) of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets (12) of each air conditioning unit are controlled to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group, including: By combining the communication connection between each air conditioning unit and its adjacent unit group, and based on the fin temperature of the outdoor unit of each air conditioning unit participating in heating, the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet (11) of the outdoor unit fan, and the opening and closing and air outlet angle of at least one side air outlet (12) of each air conditioning unit are controlled to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group.

4. The control method for a multi-unit air conditioning system according to claim 1 or 2, characterized in that, Based on the fin temperature of the outdoor unit of each of the air conditioning units participating in heating, the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet (11) of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets (12) of each air conditioning unit are controlled to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group, specifically including: If the temperature of the outdoor unit fins of any of the air conditioning units participating in heating is lower than the preset defrost entry temperature, then that air conditioning unit is determined to be the first unit; the outdoor unit fan of the first unit is controlled to be turned off, and the main air outlet (11) of the outdoor unit fan of the first unit is also controlled to be turned off, so that the first unit enters the defrost mode. If the outdoor unit fin temperature of any of the air conditioning units participating in defrosting rises to the preset defrost exit temperature, then that air conditioning unit is identified as the second unit, and the second unit is controlled to perform coordinated defrosting with its adjacent unit group.

5. The control method for a multi-unit air conditioning system according to claim 3, characterized in that, Based on the fin temperature of the outdoor unit of each of the air conditioning units participating in heating, the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet (11) of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets (12) of each air conditioning unit are controlled to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group, specifically including: If the temperature of the outdoor unit fins of any of the air conditioning units participating in heating is lower than the preset defrost entry temperature, then that air conditioning unit is determined to be the first unit; the outdoor unit fan of the first unit is controlled to be turned off, and the main air outlet (11) of the outdoor unit fan of the first unit is also controlled to be turned off, so that the first unit enters the defrost mode. If the outdoor unit fin temperature of any of the air conditioning units participating in defrosting rises to the preset defrost exit temperature, then that air conditioning unit is identified as the second unit, and the second unit is controlled to perform coordinated defrosting with its adjacent unit group.

6. The control method for a multi-unit air conditioning system according to claim 4, characterized in that, Based on the fin temperature of the outdoor unit of each of the air conditioning units participating in heating, the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet (11) of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets (12) of each air conditioning unit are controlled to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group, specifically including: Determine the outdoor unit fin temperature of each air conditioning unit in the adjacent group of the second unit; and determine the air conditioning unit with the lowest outdoor unit fin temperature in the adjacent group of the second unit as the third unit; The outdoor unit fan of the second unit is turned on, and at least one of the side air outlets (12) of the second unit that is pre-associated with the third unit is turned on. Each of the at least one side air outlet (12) is controlled to discharge air at an air outlet angle pre-associated with the third unit, so as to blow the defrosting heat of the outdoor unit fins of the second unit to the outdoor unit fins of the third unit, so that the second unit and the third unit can perform collaborative defrosting.

7. The control method for a multi-unit air conditioning system according to claim 5, characterized in that, Based on the fin temperature of the outdoor unit of each of the air conditioning units participating in heating, the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet (11) of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets (12) of each air conditioning unit are controlled to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group, specifically including: Determine the outdoor unit fin temperature of each air conditioning unit in the adjacent group of the second unit; and determine the air conditioning unit with the lowest outdoor unit fin temperature in the adjacent group of the second unit as the third unit; The outdoor unit fan of the second unit is turned on, and at least one of the side air outlets (12) of the second unit that is pre-associated with the third unit is turned on. Each of the at least one side air outlet (12) is controlled to discharge air at an air outlet angle pre-associated with the third unit, so as to blow the defrosting heat of the outdoor unit fins of the second unit to the outdoor unit fins of the third unit, so that the second unit and the third unit can perform collaborative defrosting.

8. The control method for a multi-unit air conditioning system according to claim 6 or 7, characterized in that, Based on the fin temperature of the outdoor unit of each of the air conditioning units participating in heating, the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet (11) of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets (12) of each air conditioning unit are controlled to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group, specifically including: If the temperature of the outdoor unit fins of the second unit is lower than the preset collaborative defrosting temperature, then all the side air outlets (12) of the outdoor unit fan of the second unit are closed, and the main air outlet (11) of the outdoor unit fan of the second unit is opened, so that the second unit exits the defrosting mode and participates in the heating operation of the multi-split system; wherein, the preset collaborative defrosting temperature is greater than the preset defrosting entry temperature and less than the preset defrosting exit temperature.

9. A control device for a multi-split air conditioning system that uses the control method for a multi-split air conditioning system as described in claim 1 to achieve multi-split air conditioning control, characterized in that, The multi-split air conditioning system includes: air conditioning units, wherein the number of air conditioning units is two or more; each air conditioning unit also has an air outlet device (1); in each air conditioning unit, the air outlet device (1) is located at the air outlet position of the outdoor unit fan; the air outlet device (1) includes a main air outlet (11) and four side air outlets (12); the main air outlet (11) and the side air outlets (12) have different air outlet directions; the air outlet directions of the different side air outlets (12) are also different; both the main air outlet (11) and the side air outlets (12) can be opened or closed, and the air outlet angle of the side air outlets (12) can be adjusted; the control device of the multi-split air conditioning system includes: The control unit is configured to, when the multi-split system is in heating operation, control the outdoor fan of each of the air conditioning units participating in heating to turn on, and control the main air outlet (11) of the outdoor fan of each of the air conditioning units to open and all the side air outlets (12) to close. The acquisition unit is configured to acquire the outdoor unit fin temperature of each of the air conditioning units participating in heating; The control unit is further configured to control the opening and closing of the outdoor unit fan, the opening and closing of the main air outlet (11) of the outdoor unit fan, and the opening and closing and air outlet angle of at least one of the side air outlets (12) of each of the air conditioning units participating in heating, based on the outdoor unit fin temperature of each of the air conditioning units participating in heating, so as to achieve coordinated defrosting between each air conditioning unit and its adjacent unit group; wherein, the adjacent unit group includes: a combination of at least one other outdoor unit fan of the air conditioning unit in which at least one of the air outlet angles of one or more of the side air outlets (12) of the outdoor unit fan of each air conditioning unit can be reached.

10. A multi-split air conditioning system, characterized in that, include: The control device for the multi-unit system as described in claim 9.

11. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the storage medium to perform the control method of the multi-unit system according to any one of claims 1 to 8.

12. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the control method for the multi-unit system as described in any one of claims 1 to 8.

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