Air conditioning system and control method thereof

Abstract

The invention provides an air conditioning system and a control method thereof. The outdoor unit comprises a compressor, a four-way valve, an outdoor heat exchange assembly, a first middle heat exchange assembly and a second middle heat exchange assembly; the first branch and the second branch are connected in parallel and communicate with the refrigerant main path, a first middle heat exchange assembly and a second middle heat exchange assembly are arranged on the first branch and the second branch correspondingly, and an outdoor heat exchange assembly is arranged on the refrigerant main path. Each indoor unit comprises an indoor heat exchange assembly connected through a medium pipeline, and the medium pipeline of each indoor unit can selectively flow through the first middle heat exchange assembly or the second middle heat exchange assembly; after the control device receives a defrosting instruction, the obtaining module is used for obtaining a to-be-defrosted component; and the control module is used for controlling and adjusting the working state of the outdoor unit according to the to-be-defrosted component. According to the invention, the refrigerant is prevented from directly entering the indoor space, and effective and rapid defrosting can be ensured, so that the heat exchange efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and particularly to an air conditioning system and a control method thereof. Background Art

[0002] In the related art, with the reduction of global GWP requirements, how to use different air conditioning systems and refrigerants has become a difficult choice for major enterprises. Traditional air conditioners achieve the purpose of refrigeration or heating through the delivery of media such as refrigerant circulation or water-fluorine heat exchange between the outdoor unit and the indoor unit to meet the air conditioning needs of buildings. Currently, in the solutions for realizing simultaneous refrigeration and heating requirements, the three-pipeline form is mainly adopted. The three-pipeline scheme requires a long refrigerant pipeline, and the material of this pipeline is copper, resulting in high pipeline costs. At the same time, with the gradual popularization and application of new refrigerants R32 and R454B, there are safety hazards such as explosion caused by refrigerant leakage inside. Summary of the Invention

[0003] The present invention provides an air conditioning system and a control method thereof to solve the defects existing in the prior art and achieve the following technical effects: on the one hand, it avoids the direct entry of refrigerant into the indoor space, effectively reducing safety hazards such as explosion that may be caused by refrigerant leakage; on the other hand, the optimized defrosting method can ensure the rapid and effective removal of frost on the outdoor heat exchanger when defrosting is required, thereby maintaining the heat exchange efficiency of the system and preventing the reduction of heating capacity caused by frost accumulation.

[0004] The air conditioning system according to the first aspect embodiment of the present invention includes: An outdoor unit, including a compressor, a four-way valve, an outdoor heat exchange assembly, a first intermediate heat exchange assembly, and a second intermediate heat exchange assembly connected by refrigerant pipelines; wherein, the refrigerant pipelines include a refrigerant main path, a first branch, and a second branch. The first branch and the second branch are connected in parallel with each other and are both connected to the refrigerant main path, and the first intermediate heat exchange assembly and the second intermediate heat exchange assembly are respectively provided on the first branch and the second branch, and the outdoor heat exchange assembly is provided on the refrigerant main path; A plurality of indoor units, each indoor unit includes an indoor heat exchange assembly connected by a medium pipeline, and the medium pipeline of each indoor unit can selectively flow through the first intermediate heat exchange assembly or the second intermediate heat exchange assembly; A control device, including an acquisition module and a control module. After receiving a work instruction to control the entry into the defrosting mode, the acquisition module of the control device is used to acquire the component to be defrosted in the air conditioning system; the control module is then used to control and adjust the working state of the outdoor unit according to the component to be defrosted; Wherein, the component to be defrosted includes the outdoor heat exchange assembly.

[0005] According to an embodiment of the present invention, a first valve is provided on the first branch, and a second valve is provided on the second branch; the refrigerant pipeline further includes a third branch, one end of the third branch is connected to a part of the refrigerant main pipeline between the four-way valve and the outdoor heat exchange assembly, the other end of the third branch is connected to the second branch, and a third valve is further provided on the third branch; and a fourth valve is further provided on a part of the second branch between the refrigerant main pipeline and the third branch; Preferably, the heat exchange capacity of the first intermediate heat exchange assembly is greater than or equal to the heat exchange capacity of the second intermediate heat exchange assembly.

[0006] In this way, the third valve and the fourth valve are used to realize the conversion between the parallel state and the series state of the first intermediate heat exchange assembly and the second intermediate heat exchange assembly, so as to realize the switching of the outdoor unit between the heating mode, the cooling mode, and the defrosting mode.

[0007] According to an embodiment of the present invention, the control module includes a first control module, and the first control module is specifically used for: When the component to be defrosted is the outdoor heat exchange assembly, control the first valve, the second valve, and the fourth valve to open, control the four-way valve to change direction, and control the third valve to close.

[0008] In this way, the first control module can perform four-way valve reversing defrosting on the outdoor heat exchange assembly.

[0009] According to an embodiment of the present invention, the refrigerant pipeline further includes a fourth branch, the fourth branch is connected in parallel with the first intermediate heat exchange assembly and the second intermediate heat exchange assembly at the same time, and a fifth valve is provided on the fourth branch.

[0010] In this way, by controlling the opening and closing of the fifth valve, it is possible to control whether to defrost the outdoor heat exchange assembly.

[0011] According to an embodiment of the present invention, the control module includes a second control module, and the second control module is specifically used for: When the component to be defrosted is the outdoor heat exchange assembly, control the fifth valve to open, and control the first valve, the second valve, the third valve, and the fourth valve to close.

[0012] In this way, the third control module can perform the fourth defrosting mode of defrosting the outdoor heat exchange assembly.

[0013] According to an embodiment of the present invention, the outdoor heat exchange assembly includes a first outdoor heat exchange device and a second outdoor heat exchange device. The refrigerant pipeline further includes a fifth branch and a sixth branch connected in parallel, and both ends of the fifth branch and the sixth branch are connected to the refrigerant main pipeline. The first outdoor heat exchange device and the second outdoor heat exchange device are respectively arranged on the fifth branch and the sixth branch.

[0014] According to an embodiment of the present invention, it further includes a first outdoor three-way valve and a second outdoor three-way valve. The first interface of the first outdoor three-way valve is connected to the exhaust port of the compressor through the fifth branch and the refrigerant main pipeline in sequence. The second interface is connected to the first outdoor heat exchange device through the fifth branch, and the third interface is connected to the suction port of the compressor through the seventh branch. The first interface of the second outdoor three-way valve is connected to the exhaust port of the compressor through the sixth branch and the refrigerant main pipeline in sequence. The second interface is connected to the second outdoor heat exchange device through the sixth branch, and the third interface is connected to the suction port of the compressor through the eighth branch.

[0015] In this way, the first outdoor three-way valve and the second outdoor three-way valve can be used to select the first outdoor heat exchange device or the second outdoor heat exchange device for defrosting.

[0016] According to an embodiment of the present invention, the control module further includes a third control module. The third control module is used for: When the component to be defrosted is the first outdoor heat exchange device, control the first valve, the second valve, the third valve, and the fourth valve to be all closed, and control the first interface and the second interface of the first outdoor three-way valve to be connected, and the second interface and the third interface of the second outdoor three-way valve to be connected.

[0017] In this way, the third control module can execute the defrosting mode for defrosting the first outdoor heat exchange device.

[0018] According to an embodiment of the present invention, the control module further includes a fourth control module. The fourth control module is used for: When the component to be defrosted is the second outdoor heat exchange device, control the first valve, the second valve, the third valve, and the fourth valve to be all closed, and control the first interface and the second interface of the second outdoor three-way valve to be connected, and the second interface and the third interface of the first outdoor three-way valve to be connected.

[0019] In this way, the fourth control module can execute the defrosting mode for defrosting the second outdoor heat exchange device.

[0020] According to the control method of the air conditioning system in the second aspect embodiment of the present invention, the air conditioning system includes an outdoor unit and a plurality of indoor units. The outdoor unit includes a compressor, a four-way valve, an outdoor heat exchange component, a first intermediate heat exchange component, and a second intermediate heat exchange component connected by refrigerant pipes; wherein, the refrigerant pipes include a main refrigerant path, a first branch, and a second branch. The first branch and the second branch are connected in parallel to each other and are both connected to the main refrigerant path. The first intermediate heat exchange component and the second intermediate heat exchange component are respectively provided on the first branch and the second branch, and the outdoor heat exchange component is provided on the main refrigerant path. Each indoor unit includes an indoor heat exchange component connected by a medium pipe, and the medium pipe of each indoor unit can selectively flow through the first intermediate heat exchange component or the second intermediate heat exchange component. The control method includes: Receiving a work instruction to control the entry into the defrost mode, and obtaining the components to be defrosted in the air-conditioning system; According to the components to be defrosted, controlling and adjusting the working state of the outdoor unit; Wherein, the components to be defrosted include the outdoor heat exchange component.

[0021] The present invention provides an air-conditioning system, which has at least the following advantages compared with the related art.

[0022] (1) Improvement in safety: By adopting the water-air heat exchange technology, the direct entry of refrigerant into the indoor space is avoided, effectively reducing the potential safety hazards such as explosion that may be caused by leakage when using A2L-level refrigerants such as R32 or R454B.

[0023] (2) Cost savings: Since the refrigerant no longer needs to enter the indoor space, expensive copper materials are not required for the long-distance pipes from indoor to outdoor, significantly reducing the pipeline cost.

[0024] (3) Precise control and management: Through detailed control logics such as full refrigeration control, main refrigeration mode, and defrost mode, the present invention can accurately adjust the operation of the intermediate heat exchanger to adapt to different load requirements and optimize the system performance.

[0025] (4) Improvement in efficiency and reduction in energy consumption: The optimized defrost method can ensure that the frost layer on the outdoor heat exchanger is quickly and effectively removed when defrosting is required, thereby maintaining the heat exchange efficiency of the system and preventing the decline in heating capacity caused by the accumulation of the frost layer. The efficient defrost strategy can minimize the energy consumed during the defrost process, avoid frequent or excessive defrosting, and thus reduce the overall operating cost. Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of the air-conditioning system provided by the present invention in the full refrigeration mode and the first defrosting mode.

[0028] Figure 2 It is a schematic structural diagram of the air-conditioning system provided by the present invention in the full heating mode.

[0029] Figure 3 It is a schematic structural diagram of the air-conditioning system provided by the present invention in the main heating mode.

[0030] Figure 4 It is a schematic structural diagram of the air-conditioning system provided by the present invention in the main refrigeration mode.

[0031] Figure 5 It is a schematic structural diagram of the air-conditioning system provided by the present invention in the second defrosting mode.

[0032] Figure 6 It is a schematic structural diagram of the air-conditioning system provided by the present invention in the third defrosting mode.

[0033] Figure 7 It is a schematic structural diagram of the air-conditioning system provided by the present invention in the fourth defrosting mode.

[0034] Figure 8 It is a schematic flow diagram of the control method of the air-conditioning system provided by the present invention.

[0035] Figure 9 It is a schematic structural diagram of the control device of the air-conditioning system provided by the present invention. Description of the Drawings: 1. Compressor; 2. Four-way valve; 3. Outdoor heat exchange assembly; 31. First outdoor heat exchange device; 32. Second outdoor heat exchange device; 41. First intermediate heat exchange assembly; 42. Second intermediate heat exchange assembly; 5. Gas-liquid separator; 6. Oil separator; 7. Main refrigerant path; 71. First branch; 72. Second branch; 73. Third branch; 74. Fourth branch; 75. Fifth branch; 76. Sixth branch; 77. Seventh branch; 78. Eighth branch; 81. First valve; 82. Second valve; 83. Third valve; 84. Fourth valve; 85. Fifth valve; 86. First outdoor three-way valve; 87. Second outdoor three-way valve; 9. Indoor heat exchange module; 91. Water pipeline; 92. First indoor three-way valve; 93. Second indoor three-way valve; 110. Acquisition module; 120. First control module; 130. Second control module; 140. Third control module; 150. Fourth control module. Detailed implementation manners

[0037] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0039] The following introduces an air-conditioning system and its control method according to the present invention with reference to the accompanying drawings.

[0040] As Figures 1 to 9 shown, the air-conditioning system according to the first aspect embodiment of the present invention includes an outdoor unit, a plurality of indoor units and a control device.

[0041] The outdoor unit includes a compressor 1, a four-way valve 2, an outdoor heat exchange module 3, a first intermediate heat exchange module 41 and a second intermediate heat exchange module 42 connected by a refrigerant pipeline; wherein, the refrigerant pipeline includes a refrigerant main path 7, a first branch 71 and a second branch 72. The first branch 71 and the second branch 72 are connected in parallel with each other and both communicate with the refrigerant main path 7, and the first intermediate heat exchange module 41 and the second intermediate heat exchange module 42 are respectively provided on the first branch 71 and the second branch 72, and the outdoor heat exchange module 3 is provided on the refrigerant main path 7.

[0042] Each indoor unit includes an indoor heat exchange component 9 connected by a medium pipeline (for example, the medium pipeline can be a water pipeline 91). The medium pipeline (for example, the medium pipeline can be a water pipeline 91) of each indoor unit can selectively flow through the first intermediate heat exchange component 41 or the second intermediate heat exchange component 42.

[0043] The control device includes an acquisition module 110 and a control module. After receiving a working instruction to control the entry into the defrosting mode, the acquisition module 110 is used to acquire the components to be defrosted in the air-conditioning system; the control module is used to control and adjust the working state of the outdoor unit according to the components to be defrosted.

[0044] Among them, the components to be defrosted include the outdoor heat exchange component 3.

[0045] It can be understood that in the present invention, the indoor unit and the outdoor unit are respectively two sets of flow path systems that are independent of each other, not connected to each other, and only have a heat exchange coupling relationship.

[0046] Among them, the outdoor unit is a refrigerant flow path system, and the filler inside is refrigerant (such as R32 or R454B refrigerant). Specifically, inside the outdoor unit, the four interfaces of the four-way valve 2 are respectively connected to the outdoor heat exchange component 3, the confluence of the first branch 71 and the second branch 72, the exhaust port of the compressor 1, and the suction port of the compressor 1 through the refrigerant main path 7. The refrigerant performs a refrigeration cycle or a heating cycle between the compressor 1, the outdoor heat exchange component 3, and the intermediate heat exchange components (including the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42) through the refrigerant main path 7.

[0047] For the convenience of description, hereinafter, the indoor unit will be taken as an example of a water flow path system, and the filler inside is water (of course, the filler in the medium pipeline can also be other media, and the present invention does not make special restrictions here). Specifically, the number of indoor units is one, two, or more. Each indoor unit includes a water pipeline 91 and an indoor heat exchange component 9. The water pipeline 91 flows through the intermediate heat exchange components (including the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42) and forms a water circulation loop with the indoor heat exchange component 9. At this time, the water circulation loop can take away the cold or heat in the intermediate heat exchange components (including the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42) and supply cold or heat to the indoor heat exchange component 9, thereby realizing the refrigeration or heating of the indoor unit.

[0048] As described above, in the present invention, since the refrigerant (such as R32 or R454B) only circulates in the closed system of the outdoor unit, and the indoor unit uses water as the medium, this eliminates the possibility of the refrigerant directly entering the indoor environment, effectively prevents the potential explosion risk caused by refrigerant leakage, and improves the safety of the living or working environment.

[0049] Furthermore, in the present invention, the outdoor unit integrates a compressor 1, a four-way valve 2, an outdoor heat exchange component 3, and two key components (a first intermediate heat exchange component 41 and a second intermediate heat exchange component 42), which are connected by a carefully designed refrigerant pipeline system. The refrigerant pipeline is ingeniously divided into a main path and two parallel branch paths, which are respectively connected to the first and second intermediate heat exchange components 42. Such a design endows the system with the ability to flexibly distribute the refrigerant according to different requirements of the operating mode, so as to achieve optimal performance between the heating and cooling modes.

[0050] For example, in the heating mode, the high-temperature and high-pressure refrigerant discharged from the compressor 1 is guided by the four-way valve 2 and first enters the outdoor heat exchange component 3 to release heat, and then flows through the refrigerant pipeline to the first intermediate heat exchange component 41 and / or the second intermediate heat exchange component 42. The intermediate heat exchange component transfers the heat of the refrigerant to the water in the water pipeline 91, and then the water pipeline 91 sends the heat to the indoor heat exchange component 9 of the indoor unit, finally providing warmth for the room. In the cooling mode, the process is reversed, the refrigerant absorbs heat and then releases it in the outdoor heat exchange component 3 to achieve a cooling effect.

[0051] Each indoor unit has its own indoor heat exchange component 9, and these components are connected through a water pipeline 91 network. The special feature of the water pipeline 91 design is that it allows each indoor unit to selectively flow through the first intermediate heat exchange component 41 or the second intermediate heat exchange component 42. This means that the system can independently control the supply of cold and heat sources according to the actual needs of each indoor unit. Whether it is heating or cooling, the system can accurately match the changes in the indoor environment and provide personalized temperature adjustment.

[0052] Most importantly, the control device provided in the air-conditioning system of the present invention can implement an intelligent control strategy based on the air-conditioning system. Specifically, the control device consists of an acquisition module 110 and a control module. The acquisition module 110 is responsible for identifying the components that need defrosting in the system, and the control module adjusts the working state of the outdoor unit according to the acquired information to achieve effective defrosting.

[0053] The working process of the control device is as follows: When the system receives an instruction to enter the defrost mode, the control device starts to work. The acquisition module 110 automatically detects which components (outdoor heat exchange assembly 3) in the entire system need to be defrosted. This is usually based on sensor data such as temperature and humidity, or according to preset rules of running time and environmental conditions. The control module adjusts the working state of the outdoor unit according to the information provided by the acquisition module 110. This may involve changing the position of the four-way valve 2, the operating frequency of the compressor 1, and regulating the distribution of the refrigerant in the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 to ensure that the components to be defrosted can obtain sufficient heat to melt the accumulated frost. The control device continuously monitors the defrosting process. Once it detects that the frost has been completely removed, it will automatically end the defrost mode and resume the previous operating state.

[0054] It can be understood that according to the components that need to be defrosted, the control device can dynamically adjust the operating parameters of the outdoor unit to ensure the effectiveness and safety of the defrosting process. Moreover, through the integration of the acquisition module 110 and the control module, the present invention realizes the automatic defrost control of the system, reduces the need for manual intervention, and improves the reliability and user experience of the system.

[0055] As described above, on the one hand, through the design of the main path and branch paths of the refrigerant pipeline, the system can flexibly adjust the working states of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 according to the actual load demand, realize the optimal distribution of the refrigerant, and improve the overall efficiency. In addition, since each indoor unit can independently select the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42, this means that even in the case of simultaneous heating and cooling demands, the system can meet the specific needs of each room through reasonable resource allocation. On the other hand, through the operation of the control device, the automatic defrost control of the system is realized, the need for manual intervention is reduced, and the reliability and user experience of the system are improved.

[0056] In the related art, with the reduction of the global GWP requirements, how to use different air-conditioning systems and refrigerants has become a difficult choice for major enterprises. Traditional air conditioners achieve the purpose of refrigeration or heating through the transportation of media such as refrigerant circulation or water-fluorine heat exchange between the outdoor unit and the indoor unit to meet the air-conditioning needs of buildings. In the current solutions for realizing simultaneous heating and cooling demands, the three-pipeline form is mainly adopted. The three-pipeline scheme requires a long refrigerant pipeline, and the material of this pipeline is copper, resulting in high pipeline costs. At the same time, with the gradual popularization and application of new refrigerants R32 and R454B, there are safety hazards such as explosion caused by the leakage of the inner refrigerant.

[0057] Therefore, in order to solve the technical defects existing in the above-mentioned related art, the present invention provides an air-conditioning system, which has at least the following advantages compared with the related art.

[0058] (1) Safety improvement: By adopting the water-air heat exchange technology, the direct entry of the refrigerant into the indoor space is avoided, effectively reducing the potential safety hazards such as explosion that may be caused by leakage when using A2L-level refrigerants such as R32 or R454B.

[0059] (2) Cost savings: Since the refrigerant no longer needs to enter the indoor area, expensive copper materials are not required for the long-distance piping from the indoor to the outdoor, significantly reducing the piping cost.

[0060] (3) Precise control and management: Through detailed control logics such as full refrigeration control, main refrigeration mode, and defrosting mode, etc., the present invention can accurately adjust the operation of the intermediate heat exchanger to adapt to different load requirements and optimize the system performance.

[0061] (4) Efficiency improvement and energy consumption reduction: The optimized defrosting method can ensure that the frost layer on the outdoor heat exchanger is quickly and effectively removed when defrosting is required, thus maintaining the heat exchange efficiency of the system and preventing the reduction of heating capacity caused by the accumulation of the frost layer. The efficient defrosting strategy can minimize the energy consumed during the defrosting process, avoid frequent or excessive defrosting, and thus reduce the overall operation cost.

[0062] As Figure 1 shown, according to some embodiments of the present invention, a first valve 81 is provided on the first branch 71, and a second valve 82 is provided on the second branch 72.

[0063] In this embodiment, the first valve 81 can control the on-off of the refrigerant in the first branch 71, that is, the first valve 81 can control whether the refrigerant flows through the first intermediate heat exchange component 41, and the second valve 82 can control the on-off of the refrigerant in the second branch 72, that is, the second valve 82 can control whether the refrigerant flows through the second intermediate heat exchange component 42.

[0064] Specifically, on the one hand, the valve can be opened or closed to control whether the refrigerant flows through a specific intermediate heat exchange component. When the valve is closed, the refrigerant cannot pass through, thus preventing the heat exchange process on that branch; when the valve is opened, the refrigerant can flow through and participate in the heat exchange, enabling the heat to be transferred from the outdoor unit to the indoor unit or vice versa.

[0065] On the other hand, when the system needs to switch from the refrigeration mode to the heating mode, or adjust the operation mode according to different demands (refrigeration or heating) of the indoor unit, by controlling the on-off states of the first valve 81 and the second valve 82, flexible switching between the intermediate heat exchange components can be achieved, ensuring that the system operates in the most effective mode according to the demands.

[0066] In addition, according to the system load, the first valve 81 and the second valve 82 can help adjust the distribution of the refrigerant, so that the refrigerant flow rate matches the cooling or heating demand of the indoor unit. For example, in the case of light load, only one valve may need to be opened to allow the refrigerant to flow through an intermediate heat exchange component; while in the case of high load, both valves may need to be opened so that the two intermediate heat exchange components work simultaneously to improve the system efficiency.

[0067] It should also be noted that during maintenance or when a heat exchange component fails, the corresponding valve can be closed to isolate the problem component without affecting the operation of the entire system, thereby reducing the downtime and maintenance cost.

[0068] In some specific embodiments, the first valve 81 is a first expansion valve and a cut-off valve or a check valve is connected in parallel at both ends thereof, and the second valve 82 is a second expansion valve and a cut-off valve or a check valve is connected in parallel at both ends thereof.

[0069] In this way, when throttling by the first expansion valve and the second expansion valve is not required, the cut-off valve or the check valve can be opened to reduce the resistance of the refrigerant flow and ensure the smooth flow of the refrigerant.

[0070] As Figure 1 shown, according to some embodiments of the present invention, the refrigerant pipeline further includes a third branch 73. One end of the third branch 73 is connected to a part of the refrigerant main path 7 located between the four-way valve 2 and the outdoor heat exchange component 3, the other end of the third branch 73 is connected to the second branch 72, and a third valve 83 is further provided on the third branch 73; and a fourth valve 84 is further provided on a part of the second branch 72 between the refrigerant main path 7 and the third branch 73.

[0071] Wherein, the third valve 83 and the fourth valve 84 are used to realize the conversion between the parallel state and the series state of the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42.

[0072] In the air-conditioning system of the present invention, by adding the third branch 73 and the corresponding third and fourth valves 84, the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 can not only work independently, but also be converted between the parallel state and the series state, thereby increasing the flexibility and efficiency of the system. The parallel state and the series state will be explained separately below, and the working modes will be classified based on this.

[0073] For example, in the parallel state, the third valve 83 is closed and the fourth valve 84 is open. This means that after the refrigerant passes through the outdoor heat exchange assembly 3, it can directly be split by the fourth valve 84 into the first branch 71 and the second branch 72 and enter the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 respectively. In this mode, the two heat exchange assemblies work independently at the same time, which is suitable for situations where a large amount of refrigerant is required for refrigeration, heating or defrosting simultaneously.

[0074] Also for example, in the series state, the third valve 83 is open and the fourth valve 84 is closed. At this time, after the refrigerant passes through the outdoor heat exchange assembly 3, it will first pass through the third branch 73 and enter the second intermediate heat exchange assembly 42, and then reach the first intermediate heat exchange assembly 41 through the second branch 72. In this mode, the refrigerant first passes through one heat exchange assembly and then flows into another, which is suitable for occasions where partial heating, partial refrigeration or partial defrosting of the refrigerant in the system is required.

[0075] For the air-conditioning system of the present invention, due to the different parts to be defrosted, the air-conditioning system will enter different defrost control modes by changing the valve switches, parameter states, etc. of the outdoor unit. Specifically, the defrost modes of the air-conditioning system can include: the first defrost mode, the second defrost mode, the third defrost mode, and the fourth defrost mode. Among them, the first defrost mode is the mode in which the outdoor heat exchange assembly 3 performs ordinary four-way valve commutation defrosting alone, the second defrost mode is the mode in which the outdoor heat exchange assembly 3 performs defrosting alone, the third defrost mode is the mode in which the first outdoor heat exchange device 31 in the outdoor heat exchange assembly 3 performs defrosting alone, and the fourth defrost mode is the mode in which the second outdoor heat exchange device 32 in the outdoor heat exchange assembly 3 performs defrosting alone.

[0076] It can be understood that the setting of the above defrost modes reflects the flexibility and pertinence of the system design, can accurately control the defrosting process according to the frost conditions of different components and the system requirements, not only ensures the efficient operation of the system, but also reduces the performance degradation and energy consumption increase caused by frost, and improves the overall reliability and user satisfaction of the system.

[0077] The following will introduce the above defrost modes in detail one by one in sequence.

[0078] As Figure 1 shown, the control module includes a first control module 120. The first control module 120 is used to control the air-conditioning system to enter the first defrost mode, that is, specifically, the first control module 120 is used to: when the part to be defrosted is the outdoor heat exchange assembly 3, control the first valve 81, the second valve 82 and the fourth valve 84 to open, control the four-way valve to commutate 2, and control the third valve 83 to close.

[0079] For example Figure 1As shown, in the first defrosting mode, the outdoor heat exchange component 3 acts as a condenser, and the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 are connected in parallel and both act as evaporators.

[0080] At this time, the flow path of the refrigerant in the outdoor unit is as follows: The refrigerant flows out from the exhaust port of the compressor 1, enters the outdoor heat exchange component 3 (including the first outdoor heat exchange device 31 and the second outdoor heat exchange device 32 connected in parallel) through the four-way valve 2, and becomes a low-temperature refrigerant after condensing and releasing heat in the outdoor heat exchange component 3. At this time, the outdoor heat exchange component 3 is heated to realize the defrosting process. After flowing out of the outdoor heat exchange component 3, the low-temperature refrigerant is divided into two parts and enters the first branch 71 and the second branch 72 respectively, and evaporates and absorbs heat in the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 respectively, so as to cool the indoor unit.

[0081] Finally, after the refrigerant flows out of the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42, it flows back to the suction port of the compressor 1 through the four-way valve 2 again to complete a defrosting cycle.

[0082] As Figures 1 to 7 shown, preferably, the refrigerant pipeline further includes a fourth branch 74, the fourth branch 74 is connected in parallel with both the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42, and a fifth valve 85 is provided on the fourth branch 74, wherein the fifth valve 85 is used to control whether to defrost the outdoor heat exchange component 3.

[0083] In the air-conditioning system of the present invention, the addition of the fourth branch 74 and the setting of the fifth valve 85 are to enhance the flexibility and functionality of the system. Specifically, the fourth branch 74 is connected in parallel with the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42, which means that it provides an additional path for the refrigerant to bypass these two heat exchange components and flow directly through the fifth valve 85. The purpose of this design is to realize the defrosting function of the system.

[0084] When the surface of the outdoor heat exchange component 3 is frosted, it will affect the heat exchange efficiency and thus reduce the performance of the air conditioner. By opening the fifth valve 85 on the fourth branch 74, the refrigerant can bypass the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 and directly enter the outdoor heat exchange component 3 for heating, so as to melt the frost layer on the surface. When the system detects that the surface temperature of the outdoor heat exchange component 3 is too low and reaches the preset defrosting threshold, the controller will automatically open the fifth valve 85 to guide the refrigerant to flow through the outdoor heat exchange component 3 for heating and defrosting.

[0085] As Figure 5As shown, in some further embodiments of the present invention, when the component to be defrosted is the outdoor heat exchange assembly 3, the control module includes a second control module 130. The second control module 130 needs to control the system to enter the second defrost mode, that is, the second control module 130 is specifically used for: When the component to be defrosted is the outdoor heat exchange assembly 3, control the fifth valve 85 to open, and control the first valve 81, the second valve 82, the third valve 83, and the fourth valve 84 to close.

[0086] For example Figure 5 As shown, when it is detected that the outdoor heat exchange assembly 3 is frosted due to too low temperature, the outdoor unit enters the fourth defrost mode for defrosting the outdoor heat exchange assembly 3. In the fourth defrost mode, the fourth valve 84 and the fifth valve 85 are opened, and the first valve 81, the second valve 82, and the third valve 83 are closed.

[0087] The flow path of the refrigerant is as follows: The high-temperature refrigerant flows from the exhaust port of the compressor 1 to the four-way valve 2, enters the outdoor heat exchange assembly 3 through the four-way valve 2, so as to heat and defrost the outdoor heat exchange assembly 3. The defrosted low-temperature refrigerant sequentially passes through the fourth branch 74 and the four-way valve 2 and returns to the suction port of the compressor 1 to complete a defrost cycle.

[0088] As Figures 1 to 7 As shown, preferably, the outdoor heat exchange assembly 3 includes a first outdoor heat exchange device 31 and a second outdoor heat exchange device 32. The refrigerant pipeline further includes a fifth branch 75 and a sixth branch 76 connected in parallel with each other. Both ends of the fifth branch 75 and the sixth branch 76 are connected to the refrigerant main path 7, and the first outdoor heat exchange device 31 and the second outdoor heat exchange device 32 are respectively arranged on the fifth branch 75 and the sixth branch 76.

[0089] In the present invention, the outdoor heat exchange assembly 3 is designed to include a first outdoor heat exchange device 31 and a second outdoor heat exchange device 32, which are connected in parallel with each other through the fifth branch 75 and the sixth branch 76 in the refrigerant pipeline. Both ends of the fifth branch 75 and the sixth branch 76 are connected to the refrigerant main path 7, so that the first outdoor heat exchange device 31 and the second outdoor heat exchange device 32 can operate independently or simultaneously, providing higher flexibility and efficiency for the system.

[0090] This design allows the system to selectively activate the first outdoor heat exchange device 31 or the second outdoor heat exchange device 32 according to different operating requirements and load conditions, or let both work simultaneously to optimize energy utilization and system performance. Under low load conditions, the system may only use one outdoor heat exchange device to meet the demand and save energy; while under high load conditions, the two outdoor heat exchange devices can work simultaneously to provide additional cooling or heating capacity to ensure the efficient operation of the system.

[0091] In addition, this configuration of parallel outdoor heat exchange devices also improves the redundancy and reliability of the system. If one of the heat exchange devices fails or requires maintenance, the system can still continue to operate through the other heat exchange device, avoiding the possibility of the entire system shutting down and ensuring continuous service and user satisfaction.

[0092] As Figure 6 and Figure 7 shown, preferably, the outdoor heat exchange assembly 3 further includes a first outdoor three-way valve 86 and a second outdoor three-way valve 87. The first interface of the first outdoor three-way valve 86 is sequentially connected to the exhaust port of the compressor 1 through a fifth branch 75 and the refrigerant main path 7. The second interface is connected to the first outdoor heat exchange device 31 through the fifth branch 75, and the third interface is connected to the suction port of the compressor 1 through a seventh branch 77.

[0093] The first interface of the second outdoor three-way valve 87 is sequentially connected to the exhaust port of the compressor 1 through a sixth branch 76 and the refrigerant main path 7. The second interface is connected to the second outdoor heat exchange device 32 through the sixth branch 76, and the third interface is connected to the suction port of the compressor 1 through an eighth branch 78.

[0094] Wherein, the first outdoor three-way valve 86 and the second outdoor three-way valve 87 are used to select the first outdoor heat exchange device 31 or the second outdoor heat exchange device 32 for defrosting.

[0095] In this embodiment, the first outdoor three-way valve 86 and the second outdoor three-way valve 87 are respectively connected to the exhaust port and the suction port of the compressor 1, and are connected to the first outdoor heat exchange device 31 and the second outdoor heat exchange device 32 through different branches, forming a flexible refrigerant circulation path, thereby realizing defrosting of the first outdoor heat exchange device 31 or the second outdoor heat exchange device 32.

[0096] In the defrosting mode, the system will control the on-off states of the first outdoor three-way valve 86 and the second outdoor three-way valve 87 to selectively allow the high-temperature refrigerant to first flow through the first outdoor heat exchange device 31 or the second outdoor heat exchange device 32 to achieve defrosting of a specific heat exchange device. When the second interfaces of the first outdoor three-way valve 86 and the second outdoor three-way valve 87 are activated, the refrigerant will flow through the corresponding outdoor heat exchange device, using the high-temperature and high-pressure refrigerant generated by the compressor 1 to melt the frost layer on the surface of the heat exchange assembly, thereby restoring the heat exchange efficiency.

[0097] The advantage of this design is that it allows the system to flexibly select the heat exchange assembly that needs to be defrosted during the defrosting process, without affecting the normal operation of other heat exchange assemblies, improving the overall operation efficiency and stability of the system. In addition, through the intelligent control of the three-way valve, rapid and precise defrosting can be achieved, reducing the defrosting time, lowering the energy consumption, and enhancing the user experience.

[0098] AsFigure 6 As shown, in some other embodiments of the present invention, the control module further includes a third control module 140; the third control module 140 is configured to: When the component to be defrosted is the first outdoor heat exchange device 31, control the first valve 81, the second valve 82, the third valve 83, and the fourth valve 84 to be all closed, and control the first interface and the second interface of the first outdoor three-way valve 86 to be communicated, and the second interface and the third interface of the second outdoor three-way valve 87 to be communicated.

[0099] For example Figure 6 As shown, when the first interface and the second interface of the first outdoor three-way valve 86 are communicated, and the second interface and the third interface of the second outdoor three-way valve 87 are communicated, the high-temperature refrigerant first flows from the exhaust port of the compressor 1 to the first outdoor heat exchange device 31, thereby defrosting the first outdoor heat exchange device 31. The low-temperature refrigerant after defrosting sequentially passes through the second outdoor heat exchange device 32 and the four-way valve 2, and then flows back to the suction port of the compressor 1 again to complete a defrosting cycle.

[0100] As Figure 7 As shown, in some other embodiments of the present invention, the control module further includes a fourth control module 150; the fourth control module 150 is configured to: When the component to be defrosted is the second outdoor heat exchange device 32, control the first valve 81, the second valve 82, the third valve 83, and the fourth valve 84 to be all closed, and control the first interface and the second interface of the second outdoor three-way valve 87 to be communicated, and the second interface and the third interface of the first outdoor three-way valve 86 to be communicated.

[0101] For example Figure 7 As shown, when the first interface and the second interface of the second outdoor three-way valve 87 are communicated, and the second interface and the third interface of the first outdoor three-way valve 86 are communicated, the high-temperature refrigerant first flows from the exhaust port of the compressor 1 to the second outdoor heat exchange device 32, thereby defrosting the second outdoor heat exchange device 32. The low-temperature refrigerant after defrosting sequentially passes through the first outdoor heat exchange device 31 and the four-way valve 2, and then flows back to the suction port of the compressor 1 again to complete a defrosting cycle.

[0102] As Figures 1 to 7 As shown, according to some embodiments of the present invention, the water pipe 91 can selectively flow through the first intermediate heat exchange component 41 or the second intermediate heat exchange component 42 through the first indoor three-way valve 92 and the second indoor three-way valve 93.

[0103] Specifically, the first indoor three-way valve 92 and the second indoor three-way valve 93 are respectively arranged at both ends of the indoor heat exchange assembly 9. Among them, the three interfaces of the first indoor three-way valve 92 are respectively connected to the first intermediate heat exchange assembly 41, the second intermediate heat exchange assembly 42 and the indoor heat exchange assembly 9, and the three interfaces of the second indoor three-way valve 93 are respectively connected to the first intermediate heat exchange assembly 41, the second intermediate heat exchange assembly 42 and the indoor heat exchange assembly 9. In this way, by adjusting the connection conditions of the interfaces of the first indoor three-way valve 92 and the second indoor three-way valve 93, it is possible to selectively make the water pipe 91 flow through the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42, so as to realize the cooling or heating of the indoor heat exchange assembly 9 by the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42.

[0104] In other embodiments, the above three-way valve (i.e., the first indoor three-way valve 92 or the second indoor three-way valve 93) can also be replaced by two stop valves to achieve the above-mentioned selective water pipe 91 flow-through relationship; in addition, the structure of the three-way valve or the cut-off valve for switching the indoor cooling or heating mechanism can be arranged in the outdoor unit, can also be arranged in the indoor unit, or can be centrally arranged in one or more boxes, which is mainly selected according to the installation convenience and installation cost, and the present invention does not make special limitations here.

[0105] Next, several working modes of the air conditioning system described in the above specific embodiments will be introduced with reference to the drawings.

[0106] (I) Full cooling mode: As Figure 1 shown, when the target working modes of all indoor units are cooling modes, the outdoor unit enters the full cooling mode. In the full cooling mode, at least one of the first valve 81 and the second valve 82 and the fourth valve 84 are opened, and the third valve 83 and the fifth valve 85 are closed.

[0107] In the full cooling mode, the outdoor heat exchange assembly 3 serves as a condenser, and the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 are connected in parallel and both serve as evaporators.

[0108] At this time, the refrigerant flow path in the outdoor unit is as follows: The refrigerant flows out from the exhaust port of the compressor 1, enters the outdoor heat exchange assembly 3 (including the first outdoor heat exchange device 31 and the second outdoor heat exchange device 32 connected in parallel) through the four-way valve 2, and becomes a low-temperature refrigerant after condensing and releasing heat in the outdoor heat exchange assembly 3. After flowing out of the outdoor heat exchange assembly 3, if both the first valve 81 and the second valve 82 are opened, the low-temperature refrigerant is divided into two parts and enters the first branch 71 and the second branch 72 respectively, and evaporates and absorbs heat in the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 respectively, so as to cool the indoor unit; if one of the first valve 81 and the second valve 82 is opened, the low-temperature refrigerant all enters the first branch 71 or the second branch 72, and all flows through the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 to evaporate and absorb heat, so as to cool the indoor unit.

[0109] Finally, after the refrigerant flows out of the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42, it returns to the suction port of the compressor 1 again through the four-way valve 2 to complete a refrigeration cycle.

[0110] It should be noted that the opening and closing conditions of the above first valve 81 and second valve 82 can be controlled according to the load ranges of the indoor unit and the outdoor unit, which will be introduced in detail below, so it will not be elaborated here.

[0111] (2) Full heating mode: As Figure 2 shown, when the target operating modes of all indoor units are heating modes, the outdoor unit enters the full heating mode, and in the full heating mode, at least one of the first valve 81 and the second valve 82 and the fourth valve 84 are opened, and the third valve 83 and the fifth valve 85 are closed.

[0112] In the full heating mode, the outdoor heat exchange assembly 3 serves as an evaporator, and the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 are connected in parallel and both serve as condensers.

[0113] At this time, the refrigerant flow path in the outdoor unit is as follows: The high-temperature refrigerant flows out from the exhaust port of the compressor 1, enters the intermediate heat exchange assembly through the four-way valve 2 to condense and release heat. Among them, if both the first valve 81 and the second valve 82 are opened, the high-temperature refrigerant is divided into two parts and enters the first branch 71 and the second branch 72 respectively, and condenses and releases heat in the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 respectively, so as to heat the indoor unit; if one of the first valve 81 and the second valve 82 is opened, the high-temperature refrigerant all enters the first branch 71 or the second branch 72, and all flows through the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 to condense and release heat, so as to heat the indoor unit. The high-temperature refrigerant becomes a low-temperature refrigerant after flowing out of the intermediate heat exchange assembly, and the low-temperature refrigerant flows through the outdoor heat exchange assembly 3 and evaporates and absorbs heat.

[0114] Finally, after the refrigerant flows out of the outdoor heat exchange component 3, it returns to the suction port of the compressor 1 through the four-way valve 2 again to complete a heating cycle.

[0115] It should be noted that the opening and closing conditions of the first valve 81 and the second valve 82 can be controlled according to the load ranges of the indoor unit and the outdoor unit, which will be introduced in detail below, so it will not be elaborated here.

[0116] (3) Hybrid working mode (main heating mode): As Figure 3 shown, when the target working modes of all indoor units simultaneously include the cooling mode and the heating mode, if the heating load of the air conditioning system is greater than its cooling load, the outdoor unit enters the main heating mode in the hybrid working mode, and in the main heating mode, the first valve 81, the second valve 82, and the third valve 83 are opened, and the fourth valve 84 and the fifth valve 85 are closed.

[0117] In the main heating mode, the heat exchange amount of the first intermediate heat exchange component 41 is greater than that of the second intermediate heat exchange component 42. At this time, the outdoor heat exchange component 3 and the second intermediate heat exchange component 42 are in parallel and both act as evaporators, and the first intermediate heat exchange component 41 acts as a condenser. It can be understood that in the above main heating mode, the heat exchange amount of the outdoor heat exchange component 3 plus the cooling load of the air conditioning system is equal to the heating load of the air conditioning system.

[0118] At this time, the flow path of the refrigerant in the outdoor unit is as follows: The high-temperature refrigerant flows out of the exhaust port of the compressor 1, and after passing through the four-way valve 2, the high-temperature refrigerant flows through the refrigerant main path 7 and the first branch path 71 in sequence and enters the first intermediate heat exchange component 41 to release heat by condensation, so as to heat a part of the indoor units corresponding to the first intermediate heat exchange component 41.

[0119] After flowing out of the first intermediate heat exchange component 41, the high-temperature refrigerant becomes low-temperature refrigerant. Among them, a part of the low-temperature refrigerant flows into the second intermediate heat exchange component 42 through the second branch path 72 to absorb heat by evaporation, so as to cool a part of the indoor units corresponding to the second intermediate heat exchange component 42. This part of the refrigerant flows into the refrigerant main path 7 through the third branch path 73 after flowing out of the second intermediate heat exchange component 42; Another part of the low-temperature refrigerant flows into the outdoor heat exchange component 3 through the refrigerant main path 7 to absorb heat by evaporation. After this part of the refrigerant flows out of the outdoor heat exchange component 3, it converges with the refrigerant in the third branch path 73 into the refrigerant main path 7. Finally, the refrigerant returns to the suction port of the compressor 1 through the four-way valve 2 again to complete a refrigerant cycle.

[0120] (4) Hybrid working mode (main cooling mode): As Figure 4As shown, when the target operating modes of all indoor units simultaneously include the cooling mode and the heating mode, if the cooling load of the air conditioning system is greater than its heating load, the outdoor unit enters the main cooling mode in the hybrid operating mode. In the main cooling mode, the first valve 81, the second valve 82, and the third valve 83 are opened, and the fourth valve 84 and the fifth valve 85 are closed.

[0121] In the main cooling mode, the heat exchange amount of the first intermediate heat exchanger is greater than that of the second intermediate heat exchange component 42. At this time, the outdoor heat exchange component 3 and the second intermediate heat exchange component 42 are in parallel and both act as condensers, and the first intermediate heat exchange component 41 acts as an evaporator. It can be understood that in the above-mentioned main cooling mode, the heat exchange amount of the outdoor heat exchange component 3 plus the heating load of the air conditioning system is equal to the cooling load of the air conditioning system.

[0122] At this time, the refrigerant flow path in the outdoor unit is as follows: The high-temperature refrigerant flows out from the exhaust port of the compressor 1. After passing through the four-way valve 2, the high-temperature refrigerant is divided into two paths. One path of the high-temperature refrigerant flows through the outdoor heat exchange component 3 to condense and release heat, and the other path of the high-temperature refrigerant flows through the second intermediate heat exchange component 42 through the third branch 73 to condense and release heat, so as to heat a part of the indoor units corresponding to the second intermediate heat exchange component 42. The two paths of high-temperature refrigerant become low-temperature refrigerant after condensing and releasing heat and converge to the first branch 71. The low-temperature refrigerant flows through the first intermediate heat exchange component 41 to evaporate and absorb heat, so as to cool a part of the indoor units corresponding to the first intermediate heat exchange component 41.

[0123] Finally, after the refrigerant flows out of the first intermediate heat exchange component 41, it returns to the suction port of the compressor 1 through the four-way valve 2 again to complete a refrigerant cycle.

[0124] (V) The first defrosting mode: As Figure 1 shown, the valve switch control and the refrigerant flow path in the first defrosting mode are basically the same as those in the above full cooling mode, and the present invention will not elaborate herein.

[0125] (VI) The second defrosting mode: As Figure 5 shown, when it is detected that the outdoor heat exchange component 3 is frosted due to too low temperature, the outdoor unit enters the first defrosting mode for defrosting the outdoor heat exchange component 3. In the first defrosting mode, the fourth valve 84 and the fifth valve 85 are opened, and the first valve 81, the second valve 82, and the third valve 83 are closed.

[0126] The refrigerant flow path is as follows: The high-temperature refrigerant flows from the exhaust port of the compressor 1 to the four-way valve 2, enters the outdoor heat exchange component 3 through the four-way valve 2, so as to heat and defrost the outdoor heat exchange component 3. The defrosted low-temperature refrigerant returns to the suction port of the compressor 1 through the fourth branch 74 and the four-way valve 2 in sequence to complete a defrosting cycle.

[0127] (VII) Third defrosting mode and fourth defrosting mode: As Figure 6 and Figure 7 shown, when the outdoor unit includes the first outdoor three-way valve 86 and the second outdoor three-way valve 87, the outdoor unit also has a second defrosting mode. At this time, the first valve 81, the second valve 82, the third valve 83, the fourth valve 84 and the fifth valve 85 are all closed. In the second defrosting mode, by controlling the interface connection relationship of the first outdoor three-way valve 86 and the second outdoor three-way valve 87, the system can achieve targeted defrosting of the first outdoor heat exchange device 31 or the second outdoor heat exchange device 32.

[0128] For example Figure 6 is the third defrosting mode. In this mode, when the first interface of the first outdoor three-way valve 86 is connected to the second interface, and the second interface of the second outdoor three-way valve 87 is connected to the third interface, the system performs targeted defrosting on the first outdoor heat exchange device 31.

[0129] Another example Figure 7 is the fourth defrosting mode. In this mode, when the first interface of the second outdoor three-way valve 87 is connected to the second interface, and the second interface of the first outdoor three-way valve 86 is connected to the third interface, the system performs targeted defrosting on the second outdoor heat exchange device 32.

[0130] (VIII) Anti-freezing mode: This anti-freezing mode is a mode in which one of the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 is in heating and the other is in refrigeration. The connection relationship and refrigerant flow path of the anti-freezing mode are similar to those of the above-mentioned main heating mode or main refrigeration mode, and will not be elaborated herein by the present invention.

[0131] It should be noted that the application scenario of the anti-freezing mode is: when it is detected that there is a risk of freezing in the first intermediate heat exchange component 41 or the second intermediate heat exchange component 42 due to too low temperature, the outdoor unit performs anti-freezing operation (i.e., heating) on the first intermediate heat exchange component 41 or the second intermediate heat exchange component 42.

[0132] According to the control method of the air-conditioning system of the second aspect embodiment of the present invention, the air-conditioning system includes an outdoor unit and a plurality of indoor units.

[0133] The outdoor unit includes a compressor 1, a four-way valve 2, an outdoor heat exchange component 3, a first intermediate heat exchange component 41 and a second intermediate heat exchange component 42 connected by refrigerant pipes; wherein, the refrigerant pipes include a refrigerant main path 7, a first branch 71 and a second branch 72. The first branch 71 and the second branch 72 are connected in parallel with each other and are both connected to the refrigerant main path 7, and the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 are respectively provided on the first branch 71 and the second branch 72, and the outdoor heat exchange component 3 is provided on the refrigerant main path 7.

[0134] Each indoor unit includes an indoor heat exchange component 9 connected through a water pipe 91. The water pipe 91 of each indoor unit can selectively flow through the first intermediate heat exchange component 41 or the second intermediate heat exchange component 42.

[0135] As Figure 8 shown, the control method includes: Step S1: Receive a work instruction to control entering the defrosting mode, and obtain the components to be defrosted in the air-conditioning system; Step S2: Control and adjust the working state of the outdoor unit according to the components to be defrosted.

[0136] Among them, the components to be defrosted include the outdoor heat exchange component 3.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air conditioning system, characterized in that, Comprising: An outdoor unit, including a compressor, a four-way valve, an outdoor heat exchange component, a first intermediate heat exchange component, and a second intermediate heat exchange component connected by a refrigerant pipeline; wherein, the refrigerant pipeline includes a main refrigerant path, a first branch, and a second branch, the first branch and the second branch are connected in parallel with each other and both communicate with the main refrigerant path, and the first intermediate heat exchange component and the second intermediate heat exchange component are respectively provided on the first branch and the second branch, and the outdoor heat exchange component is provided on the main refrigerant path; A plurality of indoor units, each indoor unit includes an indoor heat exchange component connected by a medium pipeline, and the medium pipeline of each indoor unit can selectively flow through the first intermediate heat exchange component or the second intermediate heat exchange component; A control device, including an acquisition module and a control module. After the control device receives a work instruction to control the entry into the defrosting mode, the acquisition module is used to acquire the components to be defrosted in the air-conditioning system; the control module is then used to control and adjust the working state of the outdoor unit according to the components to be defrosted; Wherein, the components to be defrosted include the outdoor heat exchange component.

2. The air conditioning system according to claim 1, characterized in that, A first valve is provided on the first branch, and a second valve is provided on the second branch; the refrigerant pipeline further includes a third branch, one end of the third branch is connected to a part of the main refrigerant path between the four-way valve and the outdoor heat exchange component, the other end of the third branch is connected to the second branch, and a third valve is further provided on the third branch; and a fourth valve is further provided on a part of the second branch between the main refrigerant path and the third branch; Preferably, the heat exchange amount of the first intermediate heat exchange component is greater than or equal to the heat exchange amount of the second intermediate heat exchange component.

3. The air conditioning system according to claim 2, characterized in that, The control module includes a first control module, and the first control module is specifically used for: When the component to be defrosted is the outdoor heat exchange component, controlling the first valve, the second valve, and the fourth valve to open, controlling the four-way valve to reverse, and controlling the third valve to close.

4. The air conditioning system according to claim 2, characterized in that The refrigerant pipeline further includes a fourth branch, the fourth branch is connected in parallel with the first intermediate heat exchange component and the second intermediate heat exchange component at the same time, and a fifth valve is provided on the fourth branch.

5. The air conditioning system according to claim 4, characterized in that, The control module includes a second control module, and the second control module is specifically used for: When the component to be defrosted is the outdoor heat exchange component, controlling the fifth valve to open, and controlling the first valve, the second valve, the third valve, and the fourth valve to close.

6. The air conditioning system according to any one of claims 1 to 5, characterized in that, The outdoor heat exchange component includes a first outdoor heat exchange device and a second outdoor heat exchange device, and the refrigerant pipeline further includes a fifth branch and a sixth branch connected in parallel with each other, both ends of the fifth branch and the sixth branch are connected to the main refrigerant path, and the first outdoor heat exchange device and the second outdoor heat exchange device are respectively provided on the fifth branch and the sixth branch.

7. The air conditioning system according to claim 6, wherein Further including a first outdoor three-way valve and a second outdoor three-way valve, the first interface of the first outdoor three-way valve is sequentially connected to the exhaust port of the compressor through the fifth branch and the main refrigerant path, the second interface is connected to the first outdoor heat exchange device through the fifth branch, and the third interface is connected to the suction port of the compressor through the seventh branch; The first interface of the second outdoor three-way valve is connected to the exhaust port of the compressor through the sixth branch and the refrigerant main path in sequence, the second interface is connected to the second outdoor heat exchange device through the sixth branch, and the third interface is connected to the suction port of the compressor through the eighth branch; Wherein, the first outdoor three-way valve and the second outdoor three-way valve are used to select the first outdoor heat exchange device or the second outdoor heat exchange device for defrosting.

8. The air conditioning system according to claim 7, wherein, The control module further includes a third control module; the third control module is used for: When the component to be defrosted is the first outdoor heat exchange device, controlling the first valve, the second valve, the third valve, and the fourth valve to be all closed, and controlling the first interface and the second interface of the first outdoor three-way valve to be connected, and the second interface and the third interface of the second outdoor three-way valve to be connected.

9. The air-conditioning system according to claim 7, wherein The control module further includes a fourth control module; the fourth control module is used for: When the component to be defrosted is the second outdoor heat exchange device, controlling the first valve, the second valve, the third valve, and the fourth valve to be all closed, and controlling the first interface and the second interface of the second outdoor three-way valve to be connected, and the second interface and the third interface of the first outdoor three-way valve to be connected.

10. A control method for an air conditioning system, characterized in that, The air conditioning system includes an outdoor unit and a plurality of indoor units; The outdoor unit includes a compressor, a four-way valve, an outdoor heat exchange assembly, a first intermediate heat exchange assembly, and a second intermediate heat exchange assembly connected by refrigerant pipes; wherein, the refrigerant pipes include a refrigerant main path, a first branch, and a second branch, the first branch and the second branch are connected in parallel with each other and are both connected to the refrigerant main path, and the first intermediate heat exchange assembly and the second intermediate heat exchange assembly are respectively arranged on the first branch and the second branch, and the outdoor heat exchange assembly is arranged on the refrigerant main path; Each of the indoor units includes an indoor heat exchange assembly connected by a medium pipe, and the medium pipe of each indoor unit can selectively flow through the first intermediate heat exchange assembly or the second intermediate heat exchange assembly; The control method includes: Receiving a working instruction for controlling to enter the defrosting mode, and obtaining the component to be defrosted in the air conditioning system; Controlling and adjusting the working state of the outdoor unit according to the component to be defrosted; Wherein, the component to be defrosted includes the outdoor heat exchange assembly.

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