Air conditioning system and control method for air conditioning system

Abstract

Provided in the present invention are an air conditioning system and a control method for the air conditioning system. The air conditioning system comprises: an outdoor unit, comprising a compressor, a four-way valve, an outdoor heat exchange assembly, a first intermediate heat exchange assembly and a second intermediate heat exchange assembly which are connected by means of a refrigerant pipe, wherein the refrigerant pipe comprises a refrigerant main path, a first branch and a second branch, the first branch and the second branch are connected in parallel and both connected to the refrigerant main path, the first branch and the second branch are respectively provided with the first intermediate heat exchange assembly and the second intermediate heat exchange assembly, and the outdoor heat exchange assembly is arranged on the refrigerant main path; and a plurality of indoor units, wherein each indoor unit comprises an indoor heat exchange assembly connected to a medium pipe, and the medium pipe of each indoor unit is selectively routed through the first intermediate heat exchange assembly or the second intermediate heat exchange assembly. The present solution reduces system costs, avoids the potential safety hazard of refrigerant leakage, and improves operation efficiency.

Description

Air conditioning system and control method of air conditioning system

[0001] Cross-reference to related applications

[0002] This application claims priority to four Chinese patent applications, specifically:

[0003] 1. The priority of the Chinese patent application with the application number 2024113737857 and the title "Air conditioning equipment and control method and control device thereof" filed on September 29, 2024, is claimed, which is incorporated by reference in its entirety.

[0004] 2. The priority of the Chinese patent application with the application number 2024113737861 and the title "Air conditioning system and control method thereof" filed on September 29, 2024, is claimed, which is incorporated by reference in its entirety.

[0005] 3. The priority of the Chinese patent application with the application number 2024113737804 and the title "Air conditioner and control method thereof" filed on September 29, 2024, is claimed, which is incorporated by reference in its entirety.

[0006] 4. The priority of the Chinese patent application with the application number 2024113737895 and the title "Air conditioning equipment and control method thereof" filed on September 29, 2024, is claimed, which is incorporated by reference in its entirety. TECHNICAL FIELD

[0007] The present application relates to the technical field of electrical appliances, in particular to an air conditioning system and a control method of the air conditioning system. BACKGROUND

[0008] In related technologies, with the reduction of global GWP requirements, how to use different air conditioning equipment and refrigerants has become a difficult choice for current major enterprises. Traditional air conditioners achieve the purpose of refrigeration or heating through the circulation of refrigerant between outdoor units and indoor units or the delivery of water-fluorine heat exchange medium, to meet the air conditioning needs of buildings. The current scheme for realizing simultaneous refrigeration and heating mainly adopts a three-pipe form. The three-pipe scheme requires a long refrigerant pipe, and the material of the pipe is copper, which has a high pipe cost. At the same time, with the gradual popularization and application of new refrigerants R32 and R454B, the resulting inside refrigerant leakage poses a safety hazard of explosion. SUMMARY

[0009] The present application provides an air conditioning system and a control method of the air conditioning system, to solve the defects in the prior art and achieve the following technical effects: not only reducing the system cost, avoiding the safety hazard of refrigerant leakage, but also improving the operation efficiency.

[0010] The application provides an air conditioning system, comprising: an outdoor unit, comprising 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 through a refrigerant pipeline; wherein the refrigerant pipeline comprises a refrigerant main line, a first branch line and a second branch line, the first branch line and the second branch line are parallel to each other and are both communicated to the refrigerant main line, the first intermediate heat exchange assembly and the second intermediate heat exchange assembly are respectively arranged on the first branch line and the second branch line, and the outdoor heat exchange assembly is arranged on the refrigerant main line; a plurality of indoor units, each of the indoor units comprises an indoor heat exchange assembly connected through a medium pipeline, and the medium pipeline of each of the indoor units can selectively flow through the first intermediate heat exchange assembly or the second intermediate heat exchange assembly.

[0011] According to one embodiment of the application, a first valve is arranged on the first branch line, and a second valve is arranged on the second branch line; the refrigerant pipeline further comprises a third branch line, one end of the third branch line is connected to a part of the refrigerant main line between the four-way valve and the outdoor heat exchange assembly, the other end of the third branch line is connected to the second branch line, a third valve is further arranged on the third branch line, and a fourth valve is further arranged on a part of the second branch line between the refrigerant main line and the third branch line; 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.

[0012] According to one embodiment of the application, the refrigerant pipeline further comprises a fourth branch line, the fourth branch line is parallel to the first intermediate heat exchange assembly and the second intermediate heat exchange assembly, and a fifth valve is arranged on the fourth branch line.

[0013] According to one embodiment of the application, the outdoor heat exchange assembly comprises a first outdoor heat exchange device and a second outdoor heat exchange device, the refrigerant pipeline further comprises a fifth branch line and a sixth branch line which are parallel to each other, both ends of the fifth branch line and the sixth branch line are connected to the refrigerant main line, and the first outdoor heat exchange device and the second outdoor heat exchange device are arranged on the fifth branch line and the sixth branch line respectively.

[0014] According to one embodiment of the application, a first outdoor three-way valve and a second outdoor three-way valve are further included, a first interface of the first outdoor three-way valve is communicated to an exhaust port of the compressor through the fifth branch line and the refrigerant main line in sequence, a second interface is communicated to the first outdoor heat exchange device through the fifth branch line, and a third interface is communicated to a suction port of the compressor through a seventh branch line; a first interface of the second outdoor three-way valve is communicated to an exhaust port of the compressor through the sixth branch line and the refrigerant main line in sequence, a second interface is communicated to the second outdoor heat exchange device through the sixth branch line, and a third interface is communicated to a suction port of the compressor through an eighth branch line.

[0015] According to one embodiment of the present application, the heat exchange amount of the first intermediate heat exchange assembly is greater than or equal to the heat exchange amount of the second intermediate heat exchange assembly.

[0016] According to one embodiment of the present application, the refrigerant pipeline further comprises a fourth branch, which is connected in parallel with the first intermediate heat exchange assembly and the second intermediate heat exchange assembly, and a fifth valve is arranged on the fourth branch.

[0017] According to one embodiment of the present application, the first valve is a first expansion valve, and a shutoff valve or a check valve is connected in parallel at both ends of the first expansion valve; the second valve is a second expansion valve, and a shutoff valve or a check valve is connected in parallel at both ends of the second expansion valve.

[0018] According to one embodiment of the present application, the outdoor heat exchange assembly comprises a first outdoor heat exchange device and a second outdoor heat exchange device, the refrigerant pipeline further comprises 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 refrigerant main pipeline, and the first outdoor heat exchange device and the second outdoor heat exchange device are arranged on the fifth branch and the sixth branch, respectively.

[0019] According to one embodiment of the present application, a first outdoor three-way valve and a second outdoor three-way valve are further included, a 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, a second interface is connected to the first outdoor heat exchange device through the fifth branch, and a third interface is connected to the suction port of the compressor through the seventh branch; a 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, a second interface is connected to the second outdoor heat exchange device through the sixth branch, and a third interface is connected to the suction port of the compressor through the eighth branch.

[0020] According to one embodiment of the present application, a detection device and a control device are included, the detection device is used to detect indoor load conditions and outdoor load conditions; the control device is connected to the detection device, and is used to control the working states of the first intermediate heat exchange assembly and the second intermediate heat exchange assembly according to the target working modes of each indoor unit, the indoor load conditions and the outdoor load conditions.

[0021] According to one embodiment of the present application, the first branch is provided with a first valve, and the second branch is provided with a second valve; the refrigerant pipeline further comprises a third branch, one end of the third branch is connected to 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 the third branch is further provided with a third valve; and the second branch between the refrigerant main pipeline and the third branch is further provided with a fourth valve; the control device comprises a first control module and a second control module, wherein the first control module is configured to control the outdoor unit to enter different outdoor operation modes according to the target operation modes of the indoor units; and the second control module is configured to control the working states of the first intermediate heat exchange assembly and the second intermediate heat exchange assembly according to the indoor load conditions and the outdoor load conditions in different outdoor operation modes.

[0022] According to one embodiment of the present application, the first control module is specifically configured to control the outdoor unit to enter a full cooling mode when the target operation modes of all the running indoor units are cooling modes, and control the first valve and / or the second valve and the fourth valve to be opened and the third valve to be closed in the full cooling mode.

[0023] According to one embodiment of the present application, the second control module is specifically configured to control the first intermediate heat exchange assembly or the second intermediate heat exchange assembly to run in cooling mode when the total indoor load of all the running indoor units is less than the first outdoor load of the first intermediate heat exchange assembly and less than the second outdoor load of the second intermediate heat exchange assembly in the full cooling mode, and control any one of the first valve and the second valve to be opened at this time; or control the first intermediate heat exchange assembly and the second intermediate heat exchange assembly to run in cooling mode when the total indoor load of all the running indoor units is between the first outdoor load and the second outdoor load in the full cooling mode, and control the valve corresponding to the one with larger outdoor load to be opened; or control the first intermediate heat exchange assembly and the second intermediate heat exchange assembly to run in cooling mode simultaneously when the total indoor load of all the running indoor units is greater than the first outdoor load of the first intermediate heat exchange assembly and greater than the second outdoor load of the second intermediate heat exchange assembly in the full cooling mode, and control the first valve and the second valve to be opened simultaneously.

[0024] According to one embodiment of the present application, the first control module is specifically configured to control the outdoor unit to enter a full heating mode when the target operation modes of all the running indoor units are heating modes, and control the first valve and / or the second valve and the fourth valve to be opened and the third valve to be closed in the full heating mode.

[0025] According to one embodiment of the present application, the second control module is specifically configured to: in the full heating mode, if the total indoor load of all operating indoor units is less than the first outdoor load of the first intermediate heat exchange assembly and less than the second outdoor load of the second intermediate heat exchange assembly, control the first intermediate heat exchange assembly or the second intermediate heat exchange assembly to operate in the heating mode, and at this time, control any one of the first valve and the second valve to be open; or, in the full heating mode, if the total indoor load of all operating indoor units is between the first outdoor load and the second outdoor load, control one of the first intermediate heat exchange assembly and the second intermediate heat exchange assembly with greater outdoor load to operate in the heating mode, and control the valve corresponding to the one to be open; or, in the full heating mode, if the total indoor load of all operating indoor units is greater than the first outdoor load of the first intermediate heat exchange assembly and greater than the second outdoor load of the second intermediate heat exchange assembly, control the first intermediate heat exchange assembly and the second intermediate heat exchange assembly to operate in the heating mode at the same time, and at this time, control the first valve and the second valve to be open at the same time.

[0026] According to one embodiment of the present application, the first control module is specifically configured to: in the case that the target operating mode of all operating indoor units simultaneously includes the cooling mode and the heating mode, control the outdoor unit to enter the mixed operating mode, and in the mixed operating mode, control the first valve, the second valve and the third valve to be open, and control the fourth valve to be closed.

[0027] According to one embodiment of the present application, the heat exchange capacity of the first intermediate heat exchange assembly is greater than that of the second intermediate heat exchange assembly; and the second control module is specifically configured to: in the mixed operating mode, obtain the total indoor cooling load and the total indoor heating load of all operating indoor units, and if the total indoor cooling load is greater than the total indoor heating load, control the first intermediate heat exchange assembly to be in the cooling state and the second intermediate heat exchange assembly to be in the heating state; or, in the mixed operating mode, obtain the total indoor cooling load and the total indoor heating load of all operating indoor units, and if the total indoor cooling load is less than the total indoor heating load, control the first intermediate heat exchange assembly to be in the heating state and the second intermediate heat exchange assembly to be in the cooling state.

[0028] According to one embodiment of the present application, the heat exchange capacity of the first intermediate heat exchange assembly is equal to that of the second intermediate heat exchange assembly; and the second control module is specifically configured to: in the mixed operating mode, control one of the first intermediate heat exchange assembly and the second intermediate heat exchange assembly to be in the cooling state and the other to be in the heating state.

[0029] According to an embodiment of the present application, the control device is configured to obtain the anti-freezing component in the air conditioning system and control the operation state of the outdoor unit according to the anti-freezing component after receiving an operation instruction for controlling the air conditioning system to enter the anti-freezing mode, wherein the anti-freezing component comprises the first intermediate heat exchange assembly and the second intermediate heat exchange assembly.

[0030] According to an embodiment of the present application, the control device comprises a first control module configured to control the first valve, the second valve, the third valve to be opened and the fourth valve to be closed, and control the first intermediate heat exchange assembly to operate in heating mode and the second intermediate heat exchange assembly to operate in cooling mode when the anti-freezing component is the first intermediate heat exchange assembly.

[0031] According to an embodiment of the present application, the control module comprises a second control module configured to control the first valve, the second valve, the third valve to be opened and the fourth valve to be closed, and control the first intermediate heat exchange assembly to operate in cooling mode and the second intermediate heat exchange assembly to operate in heating mode when the anti-freezing component is the second intermediate heat exchange assembly.

[0032] According to an embodiment of the present application, the control module comprises a third control module configured to control the first valve and / or the second valve to be opened and the fourth valve to be opened, control the third valve and the fifth valve to be closed, and control the first intermediate heat exchange assembly and / or the second intermediate heat exchange assembly to operate in heating mode when the anti-freezing component is the first intermediate heat exchange assembly and / or the second intermediate heat exchange assembly.

[0033] According to an embodiment of the present application, the step of obtaining the anti-freezing component in the air conditioning system comprises the following steps: obtaining the temperature of the first intermediate heat exchange assembly and the temperature of the second intermediate heat exchange assembly; determining that the anti-freezing component is the first intermediate heat exchange assembly when the temperature of the first intermediate heat exchange assembly is less than a set freezing temperature; or determining that the anti-freezing component is the second intermediate heat exchange assembly when the temperature of the second intermediate heat exchange assembly is less than the set freezing temperature; or determining that the anti-freezing component is the first intermediate heat exchange assembly and the second intermediate heat exchange assembly when the temperature of the first intermediate heat exchange assembly and the temperature of the second intermediate heat exchange assembly are both less than the set freezing temperature.

[0034] The application further provides a control method of an air conditioning system, the air conditioning system comprising an outdoor unit and a plurality of indoor units; the outdoor unit comprising 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 a refrigerant pipeline; wherein the refrigerant pipeline comprises a refrigerant main line, a first branch line and a second branch line, the first branch line and the second branch line are parallel to each other and both communicate with the refrigerant main line, and the first branch line and the second branch line are respectively provided with the first intermediate heat exchange assembly and the second intermediate heat exchange assembly, and the refrigerant main line is provided with the outdoor heat exchange assembly; each indoor unit comprises 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; the control method comprises: obtaining the target working mode of each indoor unit, the indoor load condition and the outdoor load condition; controlling the working state of the first intermediate heat exchange assembly and the second intermediate heat exchange assembly according to the target working mode of each indoor unit, the indoor load condition and the outdoor load condition; obtaining the target working mode and the indoor load condition of each indoor unit, and obtaining the outdoor load condition of the outdoor unit; controlling the outdoor unit to enter different outdoor working modes according to the target working mode of each indoor unit; in different outdoor working modes, controlling the working state of the first intermediate heat exchange assembly and the second intermediate heat exchange assembly according to the indoor load condition and the outdoor load condition; according to one embodiment of the application, the step of controlling the outdoor unit to enter different outdoor working modes according to the target working mode of each indoor unit specifically comprises: in the case that the target working mode of the running indoor unit is all in the cooling mode, controlling the outdoor unit to enter the full cooling mode, and in the full cooling mode, controlling the first valve and / or the second valve and the fourth valve to be opened, and controlling the third valve and the fifth valve to be closed; or, in the case that the target working mode of the running indoor unit is all in the heating mode, controlling the outdoor unit to enter the full heating mode, and in the full heating mode, controlling the first valve and / or the second valve and the fourth valve to be opened, and controlling the third valve and the fifth valve to be closed; or, in the case that the target working mode of the running indoor unit simultaneously comprises the cooling mode and the heating mode, controlling the outdoor unit to enter the mixed working mode, and in the mixed working mode, controlling the first valve, the second valve and the third valve to be opened, and controlling the fourth valve and the fifth valve to be closed.

[0035] According to one embodiment of the present application, the heat exchange amount of the first intermediate heat exchange assembly is greater than or equal to the heat exchange amount of the second intermediate heat exchange assembly; then the step of controlling and adjusting the working state of the first intermediate heat exchange assembly and the second intermediate heat exchange assembly according to the indoor load condition and the outdoor load condition specifically comprises: in the full cooling mode or the full heating mode, if the total indoor load of all running indoor units is less than or equal to any one of the first outdoor load of the first intermediate heat exchange assembly and the second outdoor load of the second intermediate heat exchange assembly, the first intermediate heat exchange assembly or the second intermediate heat exchange assembly is controlled to run, at this time any one of the first valve and the second valve is controlled to open; or, in the full cooling mode or the full heating mode, if the total indoor load of all running indoor units is less than the first outdoor load of the first intermediate heat exchange assembly and less than the second outdoor load of the second intermediate heat exchange assembly, the second intermediate heat exchange assembly is controlled to run, at this time the first valve is controlled to close and the second valve is controlled to open; or, in the full cooling mode or the full heating mode, if the total indoor load of all running indoor units is greater than the first outdoor load of the first intermediate heat exchange assembly and greater than the second outdoor load of the second intermediate heat exchange assembly, the first intermediate heat exchange assembly and the second intermediate heat exchange assembly are controlled to run simultaneously, at this time the first valve and the second valve are controlled to open simultaneously; or, in the full cooling mode or the full heating mode, if the total indoor load of all indoor units is less than the first outdoor load of the first intermediate heat exchange assembly and greater than the second outdoor load of the second intermediate heat exchange assembly, the first intermediate heat exchange assembly is controlled to run, at this time the first valve is controlled to open and the second valve is controlled to close; or, in the mixed working mode, the total indoor cooling load and the total indoor heating load of all running indoor units are obtained, if the total indoor cooling load is greater than the total indoor heating load, the first intermediate heat exchange assembly is controlled to be in the cooling state and the second intermediate heat exchange assembly is controlled to be in the heating state; or, in the mixed working mode, the total indoor cooling load and the total indoor heating load of all running indoor units are obtained, if the total indoor cooling load is less than the total indoor heating load, the first intermediate heat exchange assembly is controlled to be in the heating state and the second intermediate heat exchange assembly is controlled to be in the cooling state.

[0036] The air conditioning system and the control method of the air conditioning system provided by the application realize that the refrigerant only circulates on the outdoor side, refrigerant is avoided from directly entering the indoor side, and the safety when using refrigerants such as R32 and R454B is significantly improved; meanwhile, the dependence of long-distance piping from the indoor side to the outdoor side on copper pipes is reduced, the material cost is reduced, and the cost is more considerable in a large multi-split system; the system can flexibly adjust the working states of the first and second intermediate heat exchange assemblies according to the actual load, optimizes the refrigerant distribution to improve the overall efficiency; each indoor unit can independently select the intermediate heat exchange assembly, supports the simultaneous existence of heating and cooling demand, and the number of indoor units can be flexibly configured to realize personalized temperature control and enhance the flexibility of the system; through the parallel connection of multiple heat exchange assemblies, different installation environments and high load demands can be adapted, and the adaptability is improved; in addition, the refrigerant system is isolated from the water system, maintenance and fault diagnosis are more convenient, and the maintenance cost and time consumption are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0038] Fig. 1 is a structural schematic diagram of the air conditioning system provided by the application in a full cooling mode.

[0039] Fig. 2 is a structural schematic diagram of the air conditioning system provided by the application in a full heating mode.

[0040] Fig. 3 is a structural schematic diagram of the air conditioning system provided by the application in a main heating mode.

[0041] Fig. 4 is a structural schematic diagram of the air conditioning system provided by the application in a main cooling mode.

[0042] Fig. 5 is a structural schematic diagram of the air conditioning system provided by the application in a first defrosting mode.

[0043] Fig. 6 is a structural schematic diagram of the air conditioning system provided by the application in a second defrosting mode.

[0044] Fig. 7 is a structural schematic diagram of the air conditioning system provided by the application in a second defrosting mode.

[0045] Fig. 8 is a structural schematic diagram of a detection device and a control device of the air conditioning system provided by the application.

[0046] Fig. 9 is a structural schematic diagram of a control device of an air conditioning system according to the present application.

[0047] Reference signs: 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 line; 71, first branch line; 72, second branch line; 73, third branch line; 74, fourth branch line; 75, fifth branch line; 76, sixth branch line; 77, seventh branch line; 78, eighth branch line; 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 assembly; 91, water pipe; 92, first indoor three-way valve; 93, second indoor three-way valve; 100, control device; 110, acquisition module; 120, first control module; 130, second control module; 140, third control module; 150, fourth control module; 200, detection device. DETAILED DESCRIPTION

[0048] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0049] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" 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 present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those of ordinary skill in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0050] The air conditioning system and the control method thereof according to the present application will be described below with reference to the drawings.

[0051] As shown in Figs. 1 to 9, the air conditioning system according to the first aspect embodiment of the present application comprises an outdoor unit, a plurality of indoor units and a control device.

[0052] The outdoor unit comprises a compressor 1, a four-way valve 2, an outdoor heat exchange assembly 3, a first intermediate heat exchange assembly 41 and a second intermediate heat exchange assembly 42 connected by refrigerant pipelines; wherein the refrigerant pipelines comprise a refrigerant main pipeline 7, a first branch pipeline 71 and a second branch pipeline 72, the first branch pipeline 71 and the second branch pipeline 72 are connected in parallel to each other and are both communicated to the refrigerant main pipeline 7, and the first branch pipeline 71 and the second branch pipeline 72 are respectively provided with the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42, and the refrigerant main pipeline 7 is provided with the outdoor heat exchange assembly 3.

[0053] Each indoor unit comprises an indoor heat exchange assembly 9 connected by a medium pipeline (for example, the medium pipeline can be a water pipeline 91), and 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 assembly 41 or the second intermediate heat exchange assembly 42.

[0054] The control device comprises an acquisition module 110 and a control module, after receiving a working instruction of entering a defrosting mode, the acquisition module 110 is used for acquiring a component to be defrosted in the air conditioning system, and the control module is used for controlling the working state of the outdoor unit according to the component to be defrosted.

[0055] The component to be defrosted comprises the outdoor heat exchange assembly 3.

[0056] It can be understood that in the present application, the indoor unit and the outdoor unit are two sets of flow path systems which are independent of each other, are not communicated with each other and only have a heat exchange coupling relationship.

[0057] The outdoor unit is a refrigerant flow path system, and the internal filler is refrigerant (for example, R32 or R454B refrigerant), specifically, in the outdoor unit, four interfaces of the four-way valve 2 are connected with the outdoor heat exchange assembly 3, the meeting place of the first branch pipeline 71 and the second branch pipeline 72, the exhaust port of the compressor 1 and the suction port of the compressor 1 through the refrigerant main pipeline 7, and the refrigerant performs refrigeration cycle or heating cycle among the compressor 1, the outdoor heat exchange assembly 3 and the intermediate heat exchange assembly (including the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42).

[0058] For the sake of description, the following will take the indoor unit as an example, and the medium in the medium pipeline is water (of course, the medium in the medium pipeline can also be other media, and the present application does not have special limitations 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 assembly 9, the water pipeline 91 flows through the intermediate heat exchange assembly (including the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42) and forms a water circulation loop with the indoor heat exchange assembly 9, at this time, the water circulation loop can take away the cold or heat in the intermediate heat exchange assembly (including the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42) and supply cold or heat to the indoor heat exchange assembly 9, thereby realizing the refrigeration or heating of the indoor unit.

[0059] From the above, in the present application, 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, the possibility of the refrigerant directly entering the indoor environment is eliminated, the potential explosion risk caused by the refrigerant leakage is effectively prevented, and the safety of the living or working environment is improved.

[0060] Further, in the present application, the outdoor unit part integrates the compressor 1, the four-way valve 2, the outdoor heat exchange assembly 3, and two key assemblies (the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42), which are connected through a carefully designed refrigerant pipeline system. The refrigerant pipeline is ingeniously divided into one main path and two parallel branch paths, which are connected to the first and second intermediate heat exchange assemblies 42, respectively. Such a design endows the system with the ability to flexibly allocate refrigerant according to different needs of the operating mode, thereby realizing optimal performance between the heating and cooling modes.

[0061] For example, in the heating mode, the high-temperature and high-pressure refrigerant discharged by the compressor 1 is guided by the four-way valve 2, first enters the outdoor heat exchange assembly 3 to release heat, and then flows to the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42 through the refrigerant pipeline. The intermediate heat exchange assembly 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 assembly 9 of the indoor unit, finally providing warmth to the indoor. In the cooling mode, the process is reversed, the refrigerant absorbs heat, then releases it in the outdoor heat exchange assembly 3, achieving cooling effect.

[0062] Each indoor unit has its own indoor heat exchange assembly 9, and these assemblies are connected through a water pipeline 91 network. The special feature of the water pipeline 91 is that it allows each indoor unit to selectively flow through the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 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 of the indoor environment and provide personalized temperature adjustment.

[0063] Most importantly, the control device installed in the air conditioning system of the present application can implement intelligent control strategies based on the system. Specifically, the control device is composed of an acquisition module 110 and a control module. The acquisition module 110 is responsible for identifying components in the system that require defrosting, while the control module adjusts the operating state of the outdoor unit based on the acquired information to achieve effective defrosting.

[0064] The working process of the control device is as follows: when the system receives an instruction to enter the defrosting mode, the control device starts working. The acquisition module 110 automatically detects which components (outdoor heat exchange assembly 3) in the entire system require defrosting, which 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 operating state of the outdoor unit based on the information provided by the acquisition module 110. This may involve changing the position of the four-way valve 2, the running frequency of the compressor 1, and adjusting the distribution of refrigerant in the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42, ensuring that the components to be defrosted can obtain enough heat to melt the frost. The control device continuously monitors the defrosting process, and once it detects that the frost has been completely removed, it will automatically end the defrosting mode and return to the previous operating state.

[0065] It can be understood that according to the components requiring defrosting, the control device can dynamically adjust the operating parameters of the outdoor unit to ensure the effectiveness and safety of the defrosting process. Moreover, by integrating the acquisition module 110 and the control module, the present application achieves automatic defrosting control of the system, reducing the need for human intervention and improving the reliability and user experience of the system.

[0066] From the above, on the one hand, through the design of the main road and branch road of the refrigerant pipeline, the system can flexibly adjust the operating state of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 according to the actual load demand, achieve optimal distribution of refrigerant, and improve 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, it means that even in the case of simultaneous heating and cooling demand, the system can meet the specific needs of each room through reasonable resource allocation. On the other hand, through the working of the control device, automatic defrosting control of the system is achieved, reducing the need for human intervention and improving the reliability and user experience of the system.

[0067] 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 by circulating refrigerant or delivering water-fluorine heat exchange medium between the outdoor unit and the indoor unit to meet the air conditioning needs of buildings. Among the current schemes for achieving simultaneous refrigeration and heating requirements, the three-pipe scheme is mainly used. The three-pipe scheme requires a long refrigerant pipe, and the material of the pipe is copper, which has high pipe cost. At the same time, with the gradual popularization and application of new refrigerants R32 and R454B, the resulting inside refrigerant leakage poses a safety hazard of explosion.

[0068] Therefore, in order to solve the technical defects existing in the above related art, the present application provides an air conditioning system, which has at least the following advantages compared with the related art.

[0069] (1) Safety improvement: By using water-air heat exchange technology, the direct entry of refrigerant into the indoor space is avoided, effectively reducing the safety hazards such as explosion that may be caused by leakage when using A2L level refrigerants such as R32 or R454B.

[0070] (2) Cost savings: Since the refrigerant no longer needs to enter the indoor space, the long-distance pipe from the indoor unit to the outdoor unit does not need to use expensive copper materials, significantly reducing the pipe cost.

[0071] (3) Precise control and management: Through detailed control logic such as full refrigeration control, main refrigeration mode and defrosting mode, the present application can accurately adjust the operation of the intermediate heat exchanger to adapt to different load requirements and optimize system performance.

[0072] (4) Improve efficiency and reduce energy consumption: Optimized defrosting method can ensure that the frost layer on the outdoor heat exchanger is quickly and effectively removed when defrosting is needed, thereby maintaining the heat exchange efficiency of the system and preventing the heating capacity from decreasing due to frost accumulation. Efficient defrosting strategy can minimize the energy consumed during defrosting and avoid frequent or excessive defrosting, thereby reducing overall operating costs.

[0073] As shown in FIG. 1, according to some embodiments of the present application, a first valve 81 is provided on the first branch 71, and a second valve 82 is provided on the second branch 72.

[0074] 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 assembly 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 assembly 42.

[0075] Specifically, in one aspect, the valves can be opened or closed to control whether the refrigerant flows through a particular intermediate heat exchange assembly. When the valve is closed, the refrigerant cannot pass through, thereby preventing heat exchange on that branch; when the valve is opened, the refrigerant can flow through and participate in heat exchange, allowing heat to be transferred from the outdoor unit to the indoor unit or vice versa.

[0076] On the other hand, when the system needs to switch from cooling mode to heating mode, or adjust the operating mode according to the different needs of the indoor unit (cooling or heating), by controlling the opening and closing states of the first valve 81 and the second valve 82, the intermediate heat exchange assemblies can be flexibly switched between each other, ensuring that the system operates in the most efficient mode according to the needs.

[0077] 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 matches the cooling or heating needs of the indoor unit. For example, in a light load situation, only one valve may need to be opened to allow the refrigerant to flow through one intermediate heat exchange assembly; while in a high load situation, both valves may need to be opened so that both intermediate heat exchange assemblies work simultaneously, improving system efficiency.

[0078] It should also be noted that during maintenance or when a heat exchange assembly fails, the corresponding valve can be closed to isolate the problem assembly without affecting the operation of the entire system, thereby reducing downtime and maintenance costs.

[0079] In some embodiments, the first valve 81 is a first expansion valve and has a shutoff valve or a check valve connected in parallel at both ends thereof, and the second valve 82 is a second expansion valve and has a shutoff valve or a check valve connected in parallel at both ends thereof.

[0080] In this way, without the need for the first expansion valve and the second expansion valve to throttle, the shutoff valve or the check valve can be opened to reduce the resistance of the refrigerant flow, ensuring smooth flow of the refrigerant.

[0081] As shown in FIG. 1, according to some embodiments of the present application, the refrigerant pipeline further comprises a third branch 73, one end of the third branch 73 being connected to the portion of the refrigerant main line 7 between the four-way valve 2 and the outdoor heat exchange assembly 3, the other end of the third branch 73 being connected to the second branch 72, and a third valve 83 being further provided on the third branch 73; and a fourth valve 84 being further provided on the portion of the second branch 72 between the refrigerant main line 7 and the third branch 73.

[0082] 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 assembly 41 and the second intermediate heat exchange assembly 42.

[0083] In the air conditioning system of the present application, by adding the third branch 73 and the corresponding third and fourth valves 84, the first and second intermediate heat exchange assemblies 41 and 42 can not only work independently, but also can be converted between parallel and series states, thereby increasing the flexibility and efficiency of the system. The parallel and series states will be explained respectively below, and the working modes will be classified based on this.

[0084] For example, in the parallel state, the third valve 83 is closed and the fourth valve 84 is opened. This means that after passing through the outdoor heat exchange assembly 3, the refrigerant can be directly split into the first and second branches 71 and 72 through the fourth valve 84, and enter the first and second intermediate heat exchange assemblies 41 and 42 respectively. In this mode, the two heat exchange assemblies work simultaneously and independently, which is suitable for situations that require a large amount of refrigerant to cool, heat or defrost at the same time.

[0085] For example, in the series state, the third valve 83 is opened and the fourth valve 84 is closed. At this time, after passing through the outdoor heat exchange assembly 3, the refrigerant will first enter the second intermediate heat exchange assembly 42 through the third branch 73, and then reach the first intermediate heat exchange assembly 41 through the second branch 72. In this mode, the refrigerant flows into one heat exchange assembly first and then flows into another, which is suitable for situations that require the refrigerant in the system to be partially heated, partially cooled or partially defrosted.

[0086] For the air conditioning system of the present application, due to the different defrosting parts, the air conditioning system will enter different defrosting control modes by changing the valve switch, parameter state, etc. of the outdoor unit. Specifically, the defrosting modes of the air conditioning system can include: a first defrosting mode, a second defrosting mode, a third defrosting mode, and a fourth defrosting mode. Among them, the first defrosting mode is a mode in which the outdoor heat exchange assembly 3 alone performs ordinary four-way valve reversing defrosting, the second defrosting mode is a mode in which the outdoor heat exchange assembly 3 alone performs defrosting, the third defrosting mode is a mode in which the first outdoor heat exchange device 31 in the outdoor heat exchange assembly 3 alone performs defrosting, and the fourth defrosting mode is a mode in which the second outdoor heat exchange device 32 in the outdoor heat exchange assembly 3 alone performs defrosting.

[0087] It can be understood that the above-mentioned defrosting mode setting embodies the flexibility and pertinence of system design, which can accurately control the defrosting process according to the frost conditions of different components and system requirements, not only ensuring the efficient operation of the system, but also reducing the performance decline and energy consumption increase caused by frost, improving the overall reliability and user satisfaction of the system.

[0088] The following will introduce the above-mentioned defrosting modes one by one in order.

[0089] As shown in FIG. 1, the control module includes a first control module 120, which is configured to control the air conditioning system to enter a first defrosting mode. Specifically, when the component to be defrosted is the outdoor heat exchange assembly 3, the first control module 120 controls the first valve 81, the second valve 82, and the fourth valve 84 to open, controls the four-way valve 2 to reverse, and controls the third valve 83 to close.

[0090] For example, as shown in FIG. 1, in the first defrosting mode, the outdoor heat exchange assembly 3 acts as a condenser, and the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 are connected in parallel with each other and both act as evaporators.

[0091] At this time, the flow path of the refrigerant in the outdoor unit is as follows: the refrigerant flows out of the discharge 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 low-temperature refrigerant after condensing and releasing heat in the outdoor heat exchange assembly 3. At this time, the outdoor heat exchange assembly 3 is heated to achieve the defrosting process. After flowing out of the outdoor heat exchange assembly 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 assembly 41 and the second intermediate heat exchange assembly 42, respectively, thereby cooling the indoor unit.

[0092] Finally, the refrigerant flows out of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42, and then flows back to the suction port of the compressor 1 through the four-way valve 2 again, completing a defrosting cycle.

[0093] As shown in FIGS. 1-7, the refrigerant pipeline further includes a fourth branch 74, which is connected in parallel with the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42, and a fifth valve 85 is provided on the fourth branch 74. The fifth valve 85 is configured to control whether to defrost the outdoor heat exchange assembly 3.

[0094] In the air conditioning system of the present application, the fourth branch 74 and the fifth valve 85 are added to enhance the flexibility and functionality of the system. Specifically, the fourth branch 74 is connected in parallel with the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42, which means that it provides an additional path for the refrigerant to flow through the fifth valve 85 directly, bypassing the two heat exchange assemblies. The purpose of this design is to achieve the defrosting function of the system.

[0095] When the surface of the outdoor heat exchange component 3 is frosted, the heat exchange efficiency will be affected, thereby reducing 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, thereby melting the surface frost layer. 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.

[0096] As shown in FIG. 5, in still other embodiments of the present application, when the component to be defrosted is the outdoor heat exchange component 3, the control module includes a second control module 130, which needs to control the system to enter a second defrosting mode, that is, the second control module 130 is specifically used for:

[0097] In the case where the component to be defrosted is the outdoor heat exchange component 3, the fifth valve 85 is controlled to be opened, and the first valve 81, the second valve 82, the third valve 83 and the fourth valve 84 are controlled to be closed.

[0098] For example, as shown in FIG. 5, when it is detected that the outdoor heat exchange component 3 is frosted due to too low temperature, the outdoor unit enters a fourth defrosting mode for defrosting the outdoor heat exchange component 3. In the fourth 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.

[0099] The flow path of the refrigerant is as follows: 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, thereby heating and defrosting the outdoor heat exchange component 3, and low-temperature refrigerant after defrosting flows back to the suction port of the compressor 1 through the fourth branch 74 and the four-way valve 2 in turn, completing a defrosting cycle.

[0100] As shown in FIGS. 1 to 7, the outdoor heat exchange component 3 includes a first outdoor heat exchange device 31 and a second outdoor heat exchange device 32, and the refrigerant pipeline further includes a fifth branch 75 and a sixth branch 76 connected in parallel to each other, both ends of the fifth branch 75 and the sixth branch 76 are connected to the refrigerant main line 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.

[0101] In the present application, the outdoor heat exchange component 3 is designed to include the first outdoor heat exchange device 31 and the second outdoor heat exchange device 32, which are connected in parallel to 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 line 7, so that the first outdoor heat exchange device 31 and the second outdoor heat exchange device 32 can be independently or simultaneously operated, thereby providing higher flexibility and efficiency for the system.

[0102] This design allows the system to selectively activate the first outdoor heat exchange device 31 or the second outdoor heat exchange device 32, or have both work simultaneously, according to different operating requirements and load conditions, to optimize energy utilization and system performance. In low load conditions, the system can use only one outdoor heat exchange device to meet the demand, saving energy; while in high load conditions, both outdoor heat exchange devices can work simultaneously to provide additional cooling or heating capacity, ensuring efficient operation of the system.

[0103] In addition, this parallel outdoor heat exchange device configuration also improves the redundancy and reliability of the system. If one of the heat exchange devices fails or needs maintenance, the system can still continue to operate through the other heat exchange device, avoiding the possibility of the entire system shutting down, ensuring continuous service and user satisfaction.

[0104] As shown in FIGS. 6 and 7, the outdoor heat exchange assembly 3 further comprises 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 connected to the exhaust port of the compressor 1 through the fifth branch 75 and the refrigerant main line 7 in sequence, 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 the seventh branch 77.

[0105] The first interface of the second outdoor three-way valve 87 is connected to the exhaust port of the compressor 1 through the sixth branch 76 and the refrigerant main line 7 in sequence, 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 the eighth branch 78.

[0106] Among them, 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.

[0107] 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.

[0108] In the defrosting mode, the system selectively makes high-temperature refrigerant flow through the first outdoor heat exchange device 31 or the second outdoor heat exchange device 32 by controlling the switching state of the first outdoor three-way valve 86 and the second outdoor three-way valve 87, to realize 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.

[0109] The advantage of this design is that it allows the system to flexibly select the heat exchange component that needs to be defrosted during the defrosting process, while not affecting the normal operation of other heat exchange components, thereby improving the overall operation efficiency and stability of the system. In addition, through intelligent control of the three-way valve, rapid and accurate defrosting can be achieved, reducing defrosting time, reducing energy consumption, and improving user experience.

[0110] As shown in FIG. 9, in still some embodiments of the present application, the control module further comprises a third control module 140; the third control module 140 is configured to:

[0111] In the case that the component to be defrosted is the first outdoor heat exchange device 31, the first valve 81, the second valve 82, the third valve 83, and the fourth valve 84 are all controlled to be closed, and the first interface of the first outdoor three-way valve 86 is controlled to be in communication with the second interface, and the second interface of the second outdoor three-way valve 87 is controlled to be in communication with the third interface.

[0112] For example, as shown in FIG. 6, when the first interface of the first outdoor three-way valve 86 is in communication with the second interface, and the second interface of the second outdoor three-way valve 87 is in communication with the third interface, 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 again flows back to the suction port of the compressor 1, completing a defrosting cycle.

[0113] As shown in FIG. 9, in still some embodiments of the present application, the control module further comprises a fourth control module 150; the fourth control module 150 is configured to:

[0114] In the case that the component to be defrosted is the second outdoor heat exchange device 32, the first valve 81, the second valve 82, the third valve 83, and the fourth valve 84 are all controlled to be closed, and the first interface of the second outdoor three-way valve 87 is controlled to be in communication with the second interface, and the second interface of the first outdoor three-way valve 86 is controlled to be in communication with the third interface.

[0115] For example, as shown in FIG. 7, when the first interface of the second outdoor three-way valve 87 is in communication with the second interface, and the second interface of the first outdoor three-way valve 86 is in communication with the third interface, 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 again flows back to the suction port of the compressor 1, completing a defrosting cycle.

[0116] As shown in FIGS. 1-7, according to some embodiments of the present application, the water pipeline 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.

[0117] Specifically, the first indoor three-way valve 92 and the second indoor three-way valve 93 are respectively arranged at two ends of the indoor heat exchange assembly 9, wherein the three interfaces of the first indoor three-way valve 92 are respectively communicated 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 communicated 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 interface communication conditions of the first indoor three-way valve 92 and the second indoor three-way valve 93, the water pipeline 91 can selectively 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.

[0118] In other embodiments, the above-mentioned 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 groups of stop valves to realize the above-mentioned selective water pipeline 91 flow-through relationship; in addition, the structure of the above-mentioned three-way valve or stop valve for switching the cooling or heating of the indoor unit can be arranged in the outdoor unit, or arranged in the indoor unit, or arranged in one or more boxes, which is mainly selected according to the installation convenience and installation cost, and the present application does not make special limitation here.

[0119] The following describes several working modes of the air conditioning system described in the above embodiments with reference to the accompanying drawings.

[0120] (I) Full cooling mode: as shown in FIG. 1, when the target working mode of all indoor units is the cooling mode, 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.

[0121] 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.

[0122] At this time, the flow path of the refrigerant in the outdoor unit is as follows: the refrigerant flows out of the discharge port of the compressor 1, passes through the four-way valve 2, enters the outdoor heat exchange assembly 3 (including the parallelly connected first outdoor heat exchange device 31 and second outdoor heat exchange device 32), and is condensed and releases heat in the outdoor heat exchange assembly 3 to become low-temperature refrigerant. After flowing out of the outdoor heat exchange assembly 3, if the first valve 81 and the second valve 82 are both opened, the low-temperature refrigerant is divided into two parts and enters the first branch 71 and the second branch 72 respectively, and is evaporated 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 enters the first branch 71 or the second branch 72 entirely, and flows through the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 entirely to evaporate and absorb heat, so as to cool the indoor unit.

[0123] Finally, the refrigerant flows out of the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42, passes through the four-way valve 2 again, and flows back to the suction port of the compressor 1, to complete a refrigeration cycle.

[0124] It should be noted that the opening and closing of the first valve 81 and the second valve 82 described above can be controlled according to the load range of the indoor unit and the outdoor unit, which will be described in detail below, and thus will not be described in detail here.

[0125] (II) Full heating mode: as shown in FIG. 2, in the case that the target operating mode of all indoor units is the heating mode, 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.

[0126] In the full heating mode, the outdoor heat exchange assembly 3 acts as an evaporator, and the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 are parallelly connected and both act as condensers.

[0127] At this time, the flow path of the refrigerant in the outdoor unit is as follows: the high-temperature refrigerant flows out of the discharge port of the compressor 1, passes through the four-way valve 2 and enters the intermediate heat exchange assembly to be condensed and release heat, wherein if the first valve 81 and the second valve 82 are both opened, the high-temperature refrigerant is divided into two parts and enters the first branch 71 and the second branch 72 respectively, and is condensed 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 enters the first branch 71 or the second branch 72 entirely, and flows through the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 entirely to be condensed and release heat, so as to heat the indoor unit. The high-temperature refrigerant becomes 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.

[0128] Finally, the refrigerant flows out from the outdoor heat exchange assembly 3, and then, through the four-way valve 2, flows back to the suction port of the compressor 1 again, thus completing one heating cycle.

[0129] It should be noted that the opening and closing of the first valve 81 and the second valve 82 can be controlled according to the load range of the indoor unit and the outdoor unit, which will be described in detail below, and thus will not be described in detail here.

[0130] (Three) Mixed operation mode (main heating mode): as shown in FIG. 3, in the case where the target operation mode of all indoor units simultaneously includes the cooling mode and the heating mode, if the heating load of the air conditioning system is greater than the cooling load thereof, the outdoor unit enters the main heating mode in the mixed operation 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.

[0131] In the main heating mode, the heat exchange amount of the first intermediate heat exchange assembly 41 is greater than that of the second intermediate heat exchange assembly 42, at this time, the outdoor heat exchange assembly 3 and the second intermediate heat exchange assembly 42 are connected in parallel and both act as evaporators, and the first intermediate heat exchange assembly 41 acts as a condenser. It can be understood that in the above-mentioned main heating mode, the heat exchange amount of the outdoor heat exchange assembly 3 plus the cooling load of the air conditioning system is equal to the heating load of the air conditioning system.

[0132] At this time, the flow path of the refrigerant in the outdoor unit is as follows: high-temperature refrigerant flows out from the discharge port of the compressor 1, after passing through the four-way valve 2, the high-temperature refrigerant flows through the refrigerant main line 7 and the first branch line 71 in turn and enters the first intermediate heat exchange assembly 41 to condense and release heat, thereby heating the part of the indoor units corresponding to the first intermediate heat exchange assembly 41.

[0133] The high-temperature refrigerant becomes low-temperature refrigerant after flowing out of the first intermediate heat exchange assembly 41, part of the low-temperature refrigerant flows into the second intermediate heat exchange assembly 42 through the second branch line 72 to evaporate and absorb heat, thereby cooling the part of the indoor units corresponding to the second intermediate heat exchange assembly 42, and after flowing out of the second intermediate heat exchange assembly 42, the part of the refrigerant flows into the refrigerant main line 7 through the third branch line 73; the other part of the low-temperature refrigerant flows into the outdoor heat exchange assembly 3 through the refrigerant main line 7 to evaporate and absorb heat, and after flowing out of the outdoor heat exchange assembly 3, the part of the refrigerant flows into the refrigerant main line 7 together with the refrigerant in the third branch line 73. Finally, the refrigerant flows back to the suction port of the compressor 1 again through the four-way valve 2, thus completing one refrigerant cycle.

[0134] (iv) Mixed operation mode (main heating mode): As shown in FIG. 4, in the case where the target operation modes of all indoor units simultaneously include the heating mode and the cooling mode, if the heating load of the air conditioning system is greater than the cooling load, the outdoor unit enters the main heating mode in the mixed operation 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.

[0135] In the main heating mode, the heat exchange amount of the first intermediate heat exchange assembly 41 is greater than the heat exchange amount of the second intermediate heat exchange assembly 42, at this time, the outdoor heat exchange assembly 3 and the second intermediate heat exchange assembly 42 are connected in parallel and both act as evaporators, and the first intermediate heat exchange assembly 41 acts as a condenser. It can be understood that in the above-mentioned main heating mode, the heat exchange amount of the outdoor heat exchange assembly 3 plus the heating load of the air conditioning system is equal to the cooling load of the air conditioning system.

[0136] At this time, the flow path of the refrigerant in the outdoor unit is as follows: high-temperature refrigerant flows out of the discharge 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 high-temperature refrigerant flows through the outdoor heat exchange assembly 3 to condense and release heat, the other path of high-temperature refrigerant flows through the second intermediate heat exchange assembly 42 through the third branch 73 to condense and release heat, thereby heating the part of the indoor unit corresponding to the second intermediate heat exchange assembly 42, and after condensing and releasing heat, the two paths of high-temperature refrigerant become low-temperature refrigerant and converge into the first branch 71, the low-temperature refrigerant flows through the first intermediate heat exchange assembly 41 to evaporate and absorb heat, thereby cooling the part of the indoor unit corresponding to the first intermediate heat exchange assembly 41.

[0137] Finally, the refrigerant flows out of the first intermediate heat exchange assembly 41, and then flows back to the suction port of the compressor 1 through the four-way valve 2 again, completing a refrigerant cycle.

[0138] (v) First defrosting mode: As shown in FIG. 1, the valve opening and closing control and the flow path of the refrigerant in the first defrosting mode are basically the same as those in the above-mentioned full cooling mode, and the present application will not be described here.

[0139] (vi) Second defrosting mode: As shown in FIG. 5, when it is detected that the outdoor heat exchange assembly 3 has frost due to too low temperature, the outdoor unit enters the first defrosting mode to defrost the outdoor heat exchange assembly 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.

[0140] The flow path of the refrigerant is as follows: high-temperature refrigerant flows from the discharge port of the compressor 1 to the four-way valve 2, enters the outdoor heat exchange assembly 3 through the four-way valve 2, thereby heating and defrosting the outdoor heat exchange assembly 3, the low-temperature refrigerant after defrosting flows back to the suction port of the compressor 1 through the fourth branch 74 and the four-way valve 2 in turn, completing a defrosting cycle.

[0141] (Seven) third defrosting mode and fourth defrosting mode: as shown in FIG. 6 and FIG. 7, in the case that the outdoor unit comprises the first outdoor three-way valve 86 and the second outdoor three-way valve 87, the outdoor unit further 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, the system can realize targeted defrosting of the first outdoor heat exchange device 31 or the second outdoor heat exchange device 32 by controlling the interface communication relationship of the first outdoor three-way valve 86 and the second outdoor three-way valve 87.

[0142] For example, FIG. 6 is a third defrosting mode, in which mode, when the first interface of the first outdoor three-way valve 86 communicates with the second interface, and the second interface of the second outdoor three-way valve 87 communicates with the third interface, the system performs targeted defrosting on the first outdoor heat exchange device 31.

[0143] For another example, FIG. 7 is a fourth defrosting mode, in which mode, when the first interface of the second outdoor three-way valve 87 communicates with the second interface, and the second interface of the first outdoor three-way valve 86 communicates with the third interface, the system performs targeted defrosting on the second outdoor heat exchange device 32.

[0144] (Eight) anti-freezing mode: the anti-freezing mode is a mode in which one of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 heats and the other one of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 cools. The connection relationship and the refrigerant flow path of the anti-freezing mode are similar to those of the above-mentioned main heating mode or main cooling mode, and the present application will not be described here.

[0145] It should be noted that the application scenario of the anti-freezing mode is that when it is detected that the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 has a risk of freezing due to excessively low temperature, the outdoor unit performs anti-freezing operation (i.e. heating) on the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42.

[0146] According to the control method of the air conditioning system of the second embodiment of the present application, the air conditioning system comprises an outdoor unit and a plurality of indoor units.

[0147] The outdoor unit comprises a compressor 1, a four-way valve 2, an outdoor heat exchange assembly 3, a first intermediate heat exchange assembly 41 and a second intermediate heat exchange assembly 42 connected by a refrigerant pipeline; wherein the refrigerant pipeline comprises a main refrigerant line 7, a first branch line 71 and a second branch line 72, the first branch line 71 and the second branch line 72 are parallel to each other and both communicate to the main refrigerant line 7, and the first branch line 71 and the second branch line 72 are respectively provided with the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42, and the main refrigerant line 7 is provided with the outdoor heat exchange assembly 3.

[0148] Each indoor unit comprises an indoor heat exchange assembly 9 connected by a water pipeline 91, and the water pipeline 91 of each indoor unit can selectively flow through the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42.

[0149] According to a preferred embodiment, the control method can comprise:

[0150] In step S1, a working instruction of controlling to enter a defrosting mode is received, and a component to be defrosted in the air conditioning system is acquired.

[0151] In step S2, according to the component to be defrosted, a working state of the outdoor unit is controlled to be adjusted.

[0152] The component to be defrosted comprises the outdoor heat exchange assembly 3.

[0153] The present application provides an air conditioning device and a control method and control device based on the air conditioning device. All the contents described below can be mutually correspondingly referred to the air conditioning system and the control method thereof described above.

[0154] As shown in FIGS. 1 to 7, the air conditioning device according to the first embodiment of the present application comprises a plurality of indoor units and an outdoor unit.

[0155] The outdoor unit comprises a compressor 1, a four-way valve 2, an outdoor heat exchange assembly 3, a first intermediate heat exchange assembly 41 and a second intermediate heat exchange assembly 42 connected by a refrigerant pipeline; wherein the refrigerant pipeline comprises a refrigerant main line 7, a first branch line 71 and a second branch line 72, the first branch line 71 and the second branch line 72 are parallel to each other and both communicate to the refrigerant main line 7, and the first branch line 71 and the second branch line 72 are respectively provided with the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42, and the refrigerant main line 7 is provided with the outdoor heat exchange assembly 3.

[0156] Each indoor unit comprises an indoor heat exchange assembly 9 connected by a water pipeline 91, and the water pipeline 91 of each indoor unit can selectively flow through the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42.

[0157] It can be understood that in the present application, the indoor unit and the outdoor unit are two sets of flow path systems which are independent of each other, not communicated to each other and only exist a heat exchange coupling relationship.

[0158] The outdoor unit is a refrigerant flow path system, and the internal filler is refrigerant (for example, R32 or R454B refrigerant). Specifically, in the outdoor unit, the four interfaces of the four-way valve 2 are connected to the outdoor heat exchange assembly 3, the convergence of the first branch 71 and the second branch 72, the discharge port of the compressor 1, and the suction port of the compressor 1 through the refrigerant main path 7, respectively. The refrigerant performs refrigeration cycle or heating cycle between the compressor 1, the outdoor heat exchange assembly 3, and the intermediate heat exchange assembly (including the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42) through the refrigerant main path 7.

[0159] The indoor unit is a water flow path system, and the internal filler is water. Specifically, the number of indoor units is one, two, or more. Each indoor unit includes a water pipeline 91 and an indoor heat exchange assembly 9. The water pipeline 91 flows through the intermediate heat exchange assembly (including the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42) and forms a water circulation loop with the indoor heat exchange assembly 9. At this time, the water circulation loop can take away the cold or heat in the intermediate heat exchange assembly (including the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42) and supply cold or heat to the indoor heat exchange assembly 9, thereby achieving refrigeration or heating of the indoor unit.

[0160] As described above, in the present application, 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, the possibility of the refrigerant directly entering the indoor environment is eliminated, effectively preventing the potential explosion risk caused by refrigerant leakage, and improving the safety of the living or working environment.

[0161] Further, in the present application, the outdoor unit part integrates the compressor 1, the four-way valve 2, the outdoor heat exchange assembly 3, and two key assemblies (the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42), which are connected through a carefully designed refrigerant pipeline system. The refrigerant pipeline is ingeniously divided into one main path and two parallel branch paths, which are connected to the first and second intermediate heat exchange assemblies 42, respectively. Such a design gives the system the ability to flexibly allocate refrigerant according to different needs of the operating mode, thereby achieving optimal performance between heating and cooling modes.

[0162] For example, in the heating mode, the high-temperature and high-pressure refrigerant discharged by the compressor 1 is guided by the four-way valve 2, first enters the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42, and heats the water pipeline 91, so that the intermediate heat exchange assembly 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 assembly 9 of the indoor unit, finally providing warmth to the indoor. In the cooling mode, the process is reversed. The low-temperature refrigerant in the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42 cools the water pipeline 91, and then the water pipeline 91 sends the cold to the indoor heat exchange assembly 9 of the indoor unit to achieve the cooling effect.

[0163] Each indoor unit has its own indoor heat exchange component 9, which is connected through a network of water pipes 91. The design of the water pipes 91 is particularly noteworthy as it allows each indoor unit to selectively flow through either 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 heating or cooling, the system can accurately match the changes in the indoor environment, providing personalized temperature regulation.

[0164] From the above, through the design of the main and branch paths of the refrigerant pipes, the system can flexibly adjust the working state of the first and second intermediate heat exchange components 41 and 42 according to the actual load demand, realize the optimal distribution of refrigerant, and improve the overall efficiency. In addition, since each indoor unit can independently select the first or second intermediate heat exchange component 41 or 42, it means that even in the case of simultaneous heating and cooling demand, the system can meet the specific needs of each room through reasonable resource allocation.

[0165] In related technologies, with the reduction of global GWP requirements, how to use different air conditioning equipment and refrigerants has become a difficult choice for major enterprises. Traditional air conditioners achieve the purpose of cooling or heating by circulating refrigerant or delivering water-fluorine heat exchange medium between outdoor and indoor units to meet the air conditioning needs of buildings. The current scheme for realizing simultaneous cooling and heating demand mainly adopts a three-pipe form. The three-pipe scheme requires a long refrigerant pipe, which is made of copper and has high pipe cost. At the same time, with the gradual popularization and application of new refrigerants R32 and R454B, the resulting internal refrigerant leakage poses a potential safety hazard of explosion.

[0166] Therefore, in order to solve the technical defects existing in the above related technologies, the present application provides an air conditioning equipment, which has at least the following advantages compared with related technologies.

[0167] (1) Improved safety: By adopting a water-air heat exchange method instead of the traditional direct entry of refrigerant into the indoor unit, the present application significantly reduces the safety hazards caused by refrigerant leakage, especially for the application of new refrigerants R32 and R454B, avoiding potential explosion risks.

[0168] (2) Reduced cost: The present application avoids the use of long-distance copper pipes as refrigerant pipes through water-air heat exchange design, effectively reducing material costs, especially in large multi-split systems, where the cost savings are more significant.

[0169] (3) Optimized resource allocation and efficiency: Through the design of the main and branch paths of the refrigerant pipes, the system can flexibly adjust the working state of the first and second intermediate heat exchange components 41 and 42 according to the actual load demand, realize the optimal distribution of refrigerant, and improve the overall efficiency.

[0170] (4) Enhanced flexibility: Each indoor unit can independently choose the first or second intermediate heat exchange assembly 42, which means that even in the presence of simultaneous heating and cooling demands, the system can meet the specific needs of each room through reasonable resource allocation. For example, the number of indoor units can be one, two, or more, and each indoor unit is independently connected to the intermediate heat exchange assembly through water circulation, which allows users to flexibly configure the system according to actual needs and achieve personalized temperature control.

[0171] (5) Enhanced adaptability: The system can adapt to different installation environments and usage requirements, such as in large number of cases, by connecting multiple heat exchange assemblies in parallel to meet high load demands while maintaining heat exchange efficiency.

[0172] (6) Easy maintenance: Since the refrigerant system and the water system are isolated from each other, maintenance and troubleshooting are simpler, reducing maintenance costs and time consumption.

[0173] In summary, the air conditioning equipment of the present application not only reduces system cost, avoids the safety hazards of refrigerant leakage, but also improves operating efficiency, especially in handling simultaneous cooling and heating demands. In addition, since the refrigerant only circulates on the outdoor side, long-distance piping from indoors to outdoors does not require the use of expensive copper pipes, further reducing costs. The system can ensure that the refrigerant does not enter the indoor space through precise control, enhancing the safety and reliability of the equipment, while also simplifying the installation and setup process.

[0174] As shown in FIG. 1, according to some embodiments of the present application, a first valve 81 is provided on the first branch 71, and a second valve 82 is provided on the second branch 72.

[0175] In this embodiment, the first valve 81 can control the on-off of the refrigerant in the first branch 71, i.e., the first valve 81 can control whether the refrigerant flows through the first intermediate heat exchange assembly 41, and the second valve 82 can control the on-off of the refrigerant in the second branch 72, i.e., the second valve 82 can control whether the refrigerant flows through the second intermediate heat exchange assembly 42.

[0176] Specifically, on the one hand, the valve can be opened or closed to control whether the refrigerant flows through a specific intermediate heat exchange assembly. When the valve is closed, the refrigerant cannot pass through, thereby preventing the heat exchange process on that branch; when the valve is open, the refrigerant can flow through and participate in heat exchange, allowing heat to be transmitted from the outdoor unit to the indoor unit or vice versa.

[0177] On the other hand, when the system needs to switch from cooling mode to heating mode, or adjust the operation mode according to the different needs of the indoor unit (cooling or heating), by controlling the opening and closing states of the first valve 81 and the second valve 82, the flexible switching between the intermediate heat exchange assemblies can be realized, ensuring that the system operates in the most efficient mode according to the needs.

[0178] In addition, according to the system load, the first valve 81 and the second valve 82 can help adjust the distribution of refrigerant, so that the refrigerant flow matches the cooling or heating needs 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 one intermediate heat exchange assembly; while in the case of high load, both valves may need to be opened so that both intermediate heat exchange assemblies work simultaneously, improving system efficiency.

[0179] It should also be noted that during maintenance or when a certain heat exchange assembly fails, the corresponding valve can be closed to isolate the problem assembly without affecting the operation of the entire system, thereby reducing downtime and maintenance costs.

[0180] In some embodiments, the first valve 81 is a first expansion valve with a shutoff valve or a check valve connected in parallel at both ends, and the second valve 82 is a second expansion valve with a shutoff valve or a check valve connected in parallel at both ends.

[0181] In this way, without the need for the first expansion valve and the second expansion valve to throttle, the above-mentioned shutoff valve or check valve can be opened to reduce the resistance of the refrigerant flow, ensuring smooth flow of the refrigerant.

[0182] As shown in FIG. 1, according to some embodiments of the present application, the refrigerant pipeline further comprises a third branch 73, one end of the third branch 73 is connected to the part of the refrigerant main line 7 between the four-way valve 2 and the outdoor heat exchange assembly 3, the other end of the third branch 73 is connected to the second branch 72, and the third branch 73 is further provided with a third valve 83; and the part of the second branch 72 between the refrigerant main line 7 and the third branch 73 is further provided with a fourth valve 84.

[0183] Among them, 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 assembly 41 and the second intermediate heat exchange assembly 42.

[0184] In the air conditioning system of the present application, by adding the third branch 73 and the corresponding third and fourth valves 84, the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 not only can work independently, but also can be converted between the parallel and series states, thereby increasing the flexibility and efficiency of the system. The following will explain the two states of parallel and series respectively, and classify the working modes based on this.

[0185] For example, as shown in FIGS. 1 and 2, in the parallel state, the third valve 83 is closed and the fourth valve 84 is opened. This means that the refrigerant in the system can be directly branched to the first branch 71 and the second branch 72, and then 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 simultaneously and independently, which is suitable for situations requiring a large amount of refrigerant to cool or heat at the same time.

[0186] For example, as shown in FIGS. 3 and 4, in the series state, the third valve 83 is opened and the fourth valve 84 is closed. At this time, the outdoor heat exchange assembly 3 and the second intermediate heat exchange assembly 42 are connected in parallel with each other, and both the outdoor heat exchange assembly 3 and the second intermediate heat exchange assembly 42 are connected in series with the first intermediate heat exchange assembly 41. Specifically, for example, in the main heating mode of FIG. 3, the high-temperature and high-pressure refrigerant flowing out of the compressor first enters the first intermediate heat exchange assembly 41 through the first branch 71 and heats the water pipeline 41. After passing through the first intermediate heat exchange assembly 41, the refrigerant is divided into two paths, one of which flows through the outdoor heat exchange assembly 3 and absorbs heat, and the other of which flows through the second intermediate heat exchange assembly 42 and cools the water pipeline 41. Finally, the two paths of refrigerant converge and ultimately flow into the suction port of the compressor. In this mode, the refrigerant first flows through one heat exchange assembly and then flows into another, and both cooling and heating effects are achieved simultaneously, which is suitable for situations requiring simultaneous cooling and heating, as well as situations requiring defrosting without stopping.

[0187] Further, since the first branch 71, the second branch 72, and the third branch 73 are provided in the device of the present application, and a valve (including the first valve 81, the second valve 82, the third valve 83, and the fifth valve 85) is correspondingly provided on each branch, the switching between different working modes of the outdoor unit can be realized by controlling the opening and closing states of the above-mentioned valves, thereby meeting the user's demand for cooling only, heating only, and simultaneous heating and cooling.

[0188] Specifically, the different working modes of the outdoor unit include: full cooling mode, full heating mode, main cooling mode, and main heating mode.

[0189] For example, in the full cooling mode, all indoor units are in the cooling state. The system detects the total load demand and selects the opening and closing states of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 according to the load size. If the load is small, only one heat exchange assembly may be turned on; if the load is large, a parallel mode may be used to allow both heat exchange assemblies to work simultaneously.

[0190] For example, the full heating mode is similar to the full cooling mode, except that the flow direction of the refrigerant is reversed. The system selects the most effective heat exchange assembly operating mode according to the total heating demand to achieve the best heating effect.

[0191] For example, when there is both cooling and heating demand in the indoor unit, and the cooling demand is dominant, the system enters the main cooling mode. At this time, the first intermediate heat exchange component 41 can be used for cooling, while the second intermediate heat exchange component 42 is used for heating, depending on the proportion of cooling and heating demand and the system setting.

[0192] For example, when there is both cooling and heating demand in the indoor unit, and the cooling demand is dominant, the system enters the main cooling mode. At this time, the first intermediate heat exchange component 41 can be used for cooling, while the second intermediate heat exchange component 42 is used for heating, depending on the proportion of cooling and heating demand and the system setting.

[0193] In summary, through the above design, the air conditioning system of the present application can intelligently adjust the working state of the heat exchange components according to different operating conditions, thereby achieving maximum utilization of energy and efficient operation of the system while meeting the indoor temperature regulation demand.

[0194] According to some embodiments of the present application, the heat exchange capacity of the first intermediate heat exchange component 41 is greater than or equal to that of the second intermediate heat exchange component 42.

[0195] The design of the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 takes into account the heat exchange demand of the system in different operating modes. The heat exchange capacity of the first intermediate heat exchange component 41 is designed to be greater than or equal to that of the second intermediate heat exchange component 42, mainly to meet the higher heat exchange demand in the main heating or main cooling mode. This is because, in the main heating mode, the outdoor unit needs more heat to cope with the heating demand of the indoor unit, while in the main cooling mode, the outdoor unit needs more cooling capacity to cope with the cooling demand of the indoor unit. The larger heat exchange capacity of the first intermediate heat exchange component 41 can ensure that the system can effectively cope with higher load in these modes.

[0196] This design takes into account the heat exchange efficiency of the system in different operating modes, i.e. full cooling, full heating, main cooling and main heating modes. In the full cooling or full heating mode, if the load is less than or equal to 50% of the total load, the system can choose to run any one of the intermediate heat exchange components to save energy; when the load exceeds 50%, both intermediate heat exchange components will run, or only the first intermediate heat exchange component 41 with higher heat exchange capacity can be turned on to meet the higher heat exchange demand. In the main cooling or main heating mode, the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 are controlled to run simultaneously, and the cooling operation or heating operation of the first intermediate heat exchange component 41 is selected according to the mode, to achieve optimal heat exchange efficiency and energy utilization.

[0197] In addition, the size difference between the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 also takes into account the low probability that both the cooling and heating loads reach 50% when they are running simultaneously. By adjusting the size of the two heat exchange assemblies, the operating efficiency of the system can be improved under most operating conditions, avoiding waste of resources.

[0198] The technical solution of the present application optimizes the heat exchange capacity and operation strategy of the intermediate heat exchange assembly, enabling the system to achieve high efficiency and energy saving under various operating modes, especially in the simultaneous cooling and heating demand scenario. The system can intelligently select the appropriate heat exchange assembly according to the actual load condition, ensuring the flexibility and economy of system operation. This design not only improves the overall performance of the air conditioning equipment, but also reduces operating costs to some extent and improves user experience.

[0199] As shown in FIG. 1, according to some embodiments of the present application, the refrigerant pipeline further includes a fourth branch 74, which is connected in parallel with the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 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 assembly 3.

[0200] In the air conditioning system of the present application, 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 assembly 41 and the second intermediate heat exchange assembly 42, which means that it provides an additional path for the refrigerant to bypass these two heat exchange assemblies and flow directly through the fifth valve 85. The purpose of this design is to realize the defrosting function of the system.

[0201] Defrosting mode is one of the most important functions of an air conditioning system when it operates in cold weather. When the surface of the outdoor heat exchange assembly 3 is covered with frost, 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 assembly 41 and the second intermediate heat exchange assembly 42 and directly enter the outdoor heat exchange assembly 3 for heating, thereby melting the frost layer on the surface. When the system detects that the surface temperature of the outdoor heat exchange assembly 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 assembly 3 for heating and defrosting.

[0202] Specifically, the operation logic of the defrosting mode is as follows: when the system detects that the defrosting condition is met, the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 are closed, and the refrigeration or heating operation is stopped. The controller opens the fifth valve 85, and the refrigerant directly flows to the outdoor heat exchange component 3 through the fourth branch 74. When the frost layer of the outdoor heat exchange component 3 is melted, the temperature returns to the normal range, and the system will close the fifth valve 85 again, open the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42, and restore the refrigeration or heating function.

[0203] This design ensures that the system can still maintain good operating efficiency and comfort in winter or low-temperature environments, avoids the decline in heat exchange efficiency caused by frost, and also reduces the need for manual intervention, improving the automation level and maintenance convenience of the system.

[0204] Further, the air conditioning equipment of the present application also includes a control device for implementing the anti-freezing control method. Specifically, the control device includes an acquisition module and a control module. After receiving the working instruction for entering the anti-freezing mode, the acquisition module is used to acquire the anti-freezing components in the air conditioning equipment. The control module is used to control the working state of the outdoor unit according to the anti-freezing components.

[0205] Among them, the anti-freezing components include the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42.

[0206] The anti-freezing control method of the air conditioning equipment mainly controls the operating state of the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 to ensure that these two components will not freeze in low-temperature environments. Specifically, by adjusting the valve state in the system, the flow path of the refrigerant can be changed, so that one or both heat exchange components can obtain sufficient heat to prevent freezing.

[0207] Specifically, during the operation of the air conditioning equipment, both the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 have the risk of freezing.

[0208] As shown in FIG. 3, for the first intermediate heat exchange component 41, the anti-freezing operation is as follows: open the first valve 81, the second valve 82, and the third valve 83, and close the fourth valve 84. At this time, the first intermediate heat exchange component 41 enters the heating mode, and the second intermediate heat exchange component 42 enters the refrigeration mode. After the refrigerant is discharged from the compressor 1, part of it is heated by the first intermediate heat exchange component 41, and the other part is cooled by the second intermediate heat exchange component 42, and then converges to return to the compressor 1.

[0209] As shown in FIG. 4, for the second intermediate heat exchange assembly 42, the anti-freezing operation is as follows: the first valve 81, the second valve 82, and the third valve 83 are opened, and the fourth valve 84 is closed. However, this time, the first intermediate heat exchange assembly 41 enters the refrigeration mode, and the second intermediate heat exchange assembly 42 enters the heating mode. After the refrigerant is discharged from the compressor 1, part of it is cooled by the first intermediate heat exchange assembly 41, and the other part is heated by the second intermediate heat exchange assembly 42, and then they are combined and returned to the compressor 1.

[0210] As shown in FIG. 2, for the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42, the anti-freezing operation is as follows: the first valve 81 and / or the second valve 82 and the fourth valve 84 are opened, and the third valve 83 and the fifth valve 85 are closed. The first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42 enter the heating mode. After the refrigerant is discharged from the compressor 1, it enters the heat exchange assembly that needs to be anti-frozen through the opened valve for heating, and then returns to the compressor 1.

[0211] It can be understood that the system realizes the series-parallel conversion between the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 by controlling the states of the third valve 83 of the third branch 73 and the fourth valve 84 located on the part of the second branch 72 between the main refrigerant line 7 and the third branch 73. For example: when the third valve 83 is closed and the fourth valve 84 is opened, the refrigerant can flow to the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 at the same time, realizing parallel operation. When the third valve 83 is opened and the fourth valve 84 is closed, the refrigerant flows into another heat exchange assembly after passing through one heat exchange assembly, realizing series operation.

[0212] It can be understood that the main function of this anti-freezing control method is to prevent the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 from freezing due to excessively low temperature when the system operates in a cold environment. Through the above valve control, the system can selectively heat these assemblies as needed to keep their working temperature within a safe range, ensuring the continuous and reliable operation of the air conditioning equipment.

[0213] In summary, through the above control logic, the air conditioning equipment can adjust the valve state according to the actual demand in different operating modes to ensure that the system components can work effectively in any situation, especially in the anti-freezing mode, the system can prevent the key components from freezing due to low temperature, ensuring the normal operation of the equipment in a low temperature environment.

[0214] In the related art, traditional air conditioning equipment often faces the following problems in low temperature environments: (1) Single anti-freezing mode: Most air conditioning equipment only uses a single anti-freezing mode, that is, it prevents icing by simply increasing the system temperature. This method is often not flexible enough to adapt to various complex working conditions. (2) Energy waste: In order to prevent freezing, the system often needs to run at a higher temperature for a long time, which will cause unnecessary energy consumption. (3) High control complexity: In traditional air conditioning equipment, the control logic for anti-freezing is relatively simple, lacks intelligent dynamic adjustment mechanism, and cannot accurately control the working state of each heat exchange component. (4) Reliability problems: Due to the lack of effective anti-freezing measures, some systems are prone to failure in cold weather, affecting user experience.

[0215] Therefore, in order to solve the technical defects existing in the above related art, the present application provides an air conditioning equipment with an anti-freezing control device, which has at least the following advantages compared with the related art.

[0216] (1) Multiple anti-freezing mechanisms: The air conditioning equipment uses a complex valve control system that can flexibly adjust the refrigerant flow path according to different anti-freezing needs. By controlling the state of the first valve 81, the second valve 82, the third valve 83 and the fourth valve 84, various operating mode combinations between the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 can be achieved, thereby more effectively preventing these components from freezing in low temperature conditions.

[0217] (2) Energy consumption optimization: By dynamically adjusting the flow path of the refrigerant, the system can ensure anti-freezing while minimizing unnecessary energy waste. This design enables the system to improve energy utilization efficiency while meeting anti-freezing needs.

[0218] (3) Intelligent control: The system is equipped with an acquisition module and a control module, which can monitor the system state in real time and automatically adjust the working mode according to the actual situation. This intelligent design not only simplifies the operation process, but also improves the overall operating efficiency and reliability of the system.

[0219] (4) Reliability and user experience: By effectively controlling the anti-freezing of key components in the system, the system can maintain stable operation in harsh weather conditions, reducing the failure rate caused by icing, thereby improving user experience.

[0220] In summary, compared with traditional air conditioning equipment, the air conditioning equipment uses a complex valve control system and intelligent control module to achieve more flexible and efficient anti-freezing function, which not only improves the energy efficiency ratio of the system, but also enhances the reliability and user experience of the system.

[0221] The anti-freezing control method of the air conditioning device and the control device thereof will be described in detail below through several specific embodiments.

[0222] In one specific embodiment of the present application, the control module comprises a first control module, which is specifically used for:

[0223] When the anti-freezing component is the first intermediate heat exchange assembly 41, the first valve 81, the second valve 82 and the third valve 83 are controlled to be opened and the fourth valve 84 is controlled to be closed, and the first intermediate heat exchange assembly 41 is controlled to operate in heating mode and the second intermediate heat exchange assembly 42 is controlled to operate in cooling mode.

[0224] For example, as shown in FIG. 3, if the temperature of the first intermediate heat exchange assembly 41 is lower than the set freezing temperature, the outdoor unit enters the anti-freezing mode, and in the anti-freezing 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.

[0225] In the anti-freezing mode, the heat exchange capacity of the first intermediate heat exchange assembly 41 is greater than that of the second intermediate heat exchange assembly 42, at this time, the outdoor heat exchange assembly 3 and the second intermediate heat exchange assembly 42 are connected in parallel and both act as evaporators, and the first intermediate heat exchange assembly 41 acts as a condenser. It can be understood that in the above anti-freezing mode, the heat exchange capacity of the outdoor heat exchange assembly 3 plus the cooling load of the air conditioning device is equal to the heating load of the air conditioning device.

[0226] At this time, the flow path of the refrigerant in the outdoor unit is as follows: high-temperature refrigerant flows out of the discharge port of the compressor 1, after passing through the four-way valve 2, the high-temperature refrigerant flows through the refrigerant main line 7 and the first branch line 71 in turn and enters the first intermediate heat exchange assembly 41 to perform condensation heat release, so that the first intermediate heat exchange assembly 41 is heated to avoid freezing of the first intermediate heat exchange assembly 41.

[0227] After the high-temperature refrigerant flows out of the first intermediate heat exchange assembly 41, it becomes low-temperature refrigerant, part of which flows into the second intermediate heat exchange assembly 42 through the second branch line 72 to perform evaporation heat absorption, thereby cooling the part of the indoor unit corresponding to the second intermediate heat exchange assembly 42, and after flowing out of the second intermediate heat exchange assembly 42, the part of the refrigerant flows into the refrigerant main line 7 through the third branch line 73; another part of the low-temperature refrigerant flows into the outdoor heat exchange assembly 3 through the refrigerant main line 7 to perform evaporation heat absorption, and after flowing out of the outdoor heat exchange assembly 3, the part of the refrigerant flows into the refrigerant main line 7 together with the refrigerant in the third branch line 73. Finally, the refrigerant flows back to the suction port of the compressor 1 again through the four-way valve 2, completing a refrigerant cycle.

[0228] In another specific embodiment of the present application, the control module comprises a second control module, which is specifically used for:

[0229] In the case that the anti-freezing component is the second intermediate heat exchange assembly 42, the first valve 81, the second valve 82 and the third valve 83 are opened and the fourth valve 84 is closed, and the first intermediate heat exchange assembly 41 is controlled to operate in the refrigeration mode and the second intermediate heat exchange assembly 42 is controlled to operate in the heating mode.

[0230] For example, as shown in Fig. 4, if the temperature of the second intermediate heat exchange assembly 42 is lower than the set freezing temperature, the outdoor unit enters the anti-freezing mode, and in the anti-freezing 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.

[0231] In the anti-freezing mode, the heat exchange capacity of the first intermediate heat exchange assembly 41 is greater than that of the second intermediate heat exchange assembly 42, at this time, the outdoor heat exchange assembly 3 and the second intermediate heat exchange assembly 42 are connected in parallel and both act as condensers, and the first intermediate heat exchange assembly 41 acts as an evaporator. It can be understood that in the above-mentioned main refrigeration mode, the heat exchange capacity of the outdoor heat exchange assembly 3 plus the heating load of the air conditioning equipment is equal to the refrigeration load of the air conditioning equipment.

[0232] At this time, the flow path of the refrigerant in the outdoor unit is as follows: high-temperature refrigerant flows out of the discharge 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 high-temperature refrigerant flows through the outdoor heat exchange assembly 3 to condense and release heat, and the other path of high-temperature refrigerant flows through the second intermediate heat exchange assembly 42 through the third branch 73 to condense and release heat, so that the second intermediate heat exchange assembly 42 is heated to avoid freezing of the second intermediate heat exchange assembly 42, and after the two paths of high-temperature refrigerant condense and release heat, they become low-temperature refrigerant and flow into the first branch 71, and the low-temperature refrigerant flows through the first intermediate heat exchange assembly 41 to evaporate and absorb heat, thereby refrigerating the part of the indoor unit corresponding to the first intermediate heat exchange assembly 41.

[0233] Finally, the refrigerant flows out of the first intermediate heat exchange assembly 41, and then flows back to the suction port of the compressor 1 through the four-way valve 2 again, completing a refrigerant cycle.

[0234] In still another specific embodiment of the present application, the control module comprises a third control module, and the third control module is specifically used for:

[0235] In the case that the anti-freezing component is the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42, the first valve 81 and / or the second valve 82 and the fourth valve 84 are opened, and the third valve 83 and the fifth valve 85 are closed, and the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42 is controlled to operate in the heating mode.

[0236] For example, as shown in Fig. 2, in the case that the temperature of the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42 is lower than the set freezing temperature, the outdoor unit enters the anti-freezing mode, and in the anti-freezing 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.

[0237] In the anti-freezing mode, the outdoor heat exchange assembly 3 functions as an evaporator, and the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 are connected in parallel with each other and both function as condensers.

[0238] At this time, the flow path of the refrigerant in the outdoor unit is as follows: the high-temperature refrigerant flows out of the discharge port of the compressor 1, passes through the four-way valve 2, and enters the intermediate heat exchange assembly to perform condensation heat release. 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 performs condensation heat release in the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42, respectively, so as to heat the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42, respectively, to avoid freezing of the two. If one of the first valve 81 and the second valve 82 is opened, the high-temperature refrigerant enters the first branch 71 or the second branch 72 entirely, and flows through the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 entirely to perform condensation heat release, so as to heat the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 to avoid freezing of the same. The high-temperature refrigerant becomes 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 to perform evaporation heat absorption.

[0239] Finally, the refrigerant flows out of the outdoor heat exchange assembly 3, passes through the four-way valve 2 again, and returns to the suction port of the compressor 1, completing a heating cycle.

[0240] It should be noted that the opening and closing of the first valve 81 and the second valve 82 described above can be controlled according to the temperature of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42, which will be described in detail below, and thus will not be described in detail here.

[0241] As shown in Fig. 1, according to some embodiments of the present application, the outdoor heat exchange assembly 3 includes a first outdoor heat exchange device 31 and a second outdoor heat exchange device 32, and 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 main refrigerant pipeline 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.

[0242] In the present application, 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 line 7, so that the first outdoor heat exchange device 31 and the second outdoor heat exchange device 32 can be operated independently or simultaneously, providing higher flexibility and efficiency for the system.

[0243] This design allows the system to selectively activate the first outdoor heat exchange device 31 or the second outdoor heat exchange device 32, or allow both to work simultaneously, to optimize energy utilization and system performance according to different operating requirements and load conditions. Under low load conditions, the system will only use one outdoor heat exchange device to meet the demand, saving energy; while under high load conditions, both outdoor heat exchange devices can work simultaneously to provide additional cooling or heating capacity, ensuring efficient operation of the system.

[0244] In addition, this parallel configuration of outdoor heat exchange devices also improves the redundancy and reliability of the system. If one of the heat exchange devices fails or needs maintenance, the system can still continue to operate through the other heat exchange device, avoiding the entire system downtime, ensuring continuous service and user satisfaction.

[0245] As shown in FIGS. 6 and 7, in some specific embodiments of the present application, the outdoor unit 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 connected to the exhaust port of the compressor 1 through the fifth branch 75 and the refrigerant main line 7 in sequence, 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 the seventh branch 77.

[0246] The first interface of the second outdoor three-way valve 87 is connected to the exhaust port of the compressor 1 through the sixth branch 76 and the refrigerant main line 7 in sequence, 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 the eighth branch 78.

[0247] Among them, 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.

[0248] In this embodiment, the first outdoor three-way valve 86 and the second outdoor three-way valve 87 are connected to the exhaust port and the suction port of the compressor 1 respectively, 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.

[0249] In the defrosting mode, the system selectively makes the high-temperature refrigerant flow through the first outdoor heat exchange device 31 or the second outdoor heat exchange device 32 by controlling the switching state of the first outdoor three-way valve 86 and the second outdoor three-way valve 87, so as to realize 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, and the high-temperature and high-pressure refrigerant generated by the compressor 1 is used to melt the frost layer on the surface of the heat exchange component, so as to restore the heat exchange efficiency.

[0250] For example, as shown in FIG. 6, when the first interface of the first outdoor three-way valve 86 is in communication with the second interface, and the second interface of the second outdoor three-way valve 87 is in communication with the third interface, the high-temperature refrigerant flows from the exhaust port of the compressor 1 to the first outdoor heat exchange device 31 first, so as to defrost 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.

[0251] For another example, as shown in FIG. 7, when the first interface of the second outdoor three-way valve 87 is in communication with the second interface, and the second interface of the first outdoor three-way valve 86 is in communication with the third interface, the high-temperature refrigerant flows from the exhaust port of the compressor 1 to the second outdoor heat exchange device 32 first, so as to defrost 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.

[0252] The advantage of this design is that it allows the system to flexibly select the heat exchange component that needs to be defrosted during the defrosting process, while not affecting the normal operation of other heat exchange components, thereby improving the overall operation efficiency and stability of the system. In addition, through intelligent control of the three-way valve, fast and accurate defrosting can be realized, the defrosting time is reduced, the energy consumption is reduced, and the user experience is improved.

[0253] As shown in FIG. 1, according to some embodiments of the present application, the water pipeline 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.

[0254] Specifically, the first indoor three-way valve 92 and the second indoor three-way valve 93 are arranged at two ends of the indoor heat exchange assembly 9 respectively, wherein the three interfaces of the first indoor three-way valve 92 are communicated to the first intermediate heat exchange assembly 41, the second intermediate heat exchange assembly 42 and the indoor heat exchange assembly 9 respectively, and the three interfaces of the second indoor three-way valve 93 are communicated to the first intermediate heat exchange assembly 41, the second intermediate heat exchange assembly 42 and the indoor heat exchange assembly 9 respectively. In this way, by adjusting the interface communication conditions of the first indoor three-way valve 92 and the second indoor three-way valve 93, the water pipeline 91 can selectively 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.

[0255] In other embodiments, the above-mentioned 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 groups of stop valves to realize the above-mentioned selective water pipeline 91 flow-through relationship; in addition, the structure of the three-way valve or the stop valve valve for switching the cooling or heating of the indoor unit can be arranged in the outdoor unit, can be arranged in the indoor unit, or can be arranged in one or more boxes, which is mainly selected according to the installation convenience and installation cost, and the present application does not make special limitation here.

[0256] A specific embodiment of the structure of the air conditioning equipment of the present application is described below with reference to the accompanying drawings, and each working state and working mode of the air conditioning equipment is introduced in detail according to the specific embodiment.

[0257] As shown in FIGS. 1 to 7, the air conditioning equipment includes an outdoor unit and a plurality of indoor units, the outdoor unit includes a compressor 1, a four-way valve 2, an outdoor heat exchange assembly 3, a first intermediate heat exchange assembly 41, a second intermediate heat exchange assembly 42, a gas-liquid separator 5 and an oil separator 6 connected by refrigerant pipelines. Each indoor unit includes an indoor heat exchange assembly 9 connected by a water pipeline 91, wherein the water pipeline 91 selectively flows through the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 through a first indoor three-way valve 92 and a second indoor three-way valve 93.

[0258] The four interfaces of the four-way valve 2 are connected to the outdoor heat exchange assembly 3, the meeting point of the first branch 71 and the second branch 72, the discharge port of the compressor 1, and the suction port of the compressor 1 through the refrigerant main line 7 respectively. One end of the third branch 73 is connected to the refrigerant main line 7 between the four-way valve 2 and the outdoor heat exchange assembly 3, and the other end of the third branch 73 is connected to the second branch 72. The third valve 83 is arranged on the third branch 73. The fourth valve 84 is arranged on the second branch 72 between the refrigerant main line 7 and the third branch 73. The refrigerant pipeline further comprises a fourth branch 74, which is connected to the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 in parallel, and the fifth valve 85 is arranged on the fourth branch 74.

[0259] The outdoor heat exchange assembly 3 comprises the first outdoor heat exchange device 31 arranged on the fifth branch 75 and the second outdoor heat exchange device 32 arranged on the sixth branch 76. The fifth branch 75 and the sixth branch 76 are connected to the refrigerant main line 7 in parallel.

[0260] The following describes several working modes of the air conditioning device according to the above embodiments with reference to the accompanying drawings.

[0261] (I) Full refrigeration mode: As shown in FIG. 1, when the target working mode of all indoor units is the refrigeration mode, the outdoor unit enters the full refrigeration mode. In the full refrigeration 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.

[0262] In the full refrigeration mode, the outdoor heat exchange assembly 3 acts as a condenser, and the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 are connected in parallel and act as evaporators.

[0263] At this time, the flow path of the refrigerant in the outdoor unit is as follows: the refrigerant flows out of the discharge 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 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 the first valve 81 and the second valve 82 are both 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, thereby refrigerating the indoor unit. If one of the first valve 81 and the second valve 82 is opened, the low-temperature refrigerant enters the first branch 71 or the second branch 72 entirely, and evaporates and absorbs heat in the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 entirely, thereby refrigerating the indoor unit.

[0264] Finally, the refrigerant flows out from the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42, and then flows back to the suction port of the compressor 1 through the four-way valve 2 again to complete a refrigeration cycle.

[0265] It should be noted that the opening and closing of the first valve 81 and the second valve 82 can be controlled according to the load range of the indoor unit and the outdoor unit, which will be described in detail below, and thus will not be described in detail here.

[0266] (II) Full heating mode: As shown in FIG. 2, in the case where the target operating mode of all indoor units is the heating mode, 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.

[0267] In the full heating mode, the outdoor heat exchange assembly 3 acts as an evaporator, and the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 are connected in parallel to each other and both act as condensers.

[0268] At this time, the flow path of the refrigerant in the outdoor unit is as follows: high-temperature refrigerant flows out from the discharge port of the compressor 1, passes through the four-way valve 2 and enters the intermediate heat exchange assembly to condense and release heat, wherein 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, thereby heating the indoor unit; if one of the first valve 81 and the second valve 82 is opened, the high-temperature refrigerant enters the first branch 71 or the second branch 72 entirely, and flows through the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 to condense and release heat, thereby heating the indoor unit. The high-temperature refrigerant becomes low-temperature refrigerant after flowing out of the intermediate heat exchange assembly, and flows through the outdoor heat exchange assembly 3 to evaporate and absorb heat.

[0269] Finally, the refrigerant flows out from the outdoor heat exchange assembly 3, and then flows back to the suction port of the compressor 1 through the four-way valve 2 again to complete a heating cycle.

[0270] It should be noted that the opening and closing of the first valve 81 and the second valve 82 can be controlled according to the load range of the indoor unit and the outdoor unit, which will be described in detail below, and thus will not be described in detail here.

[0271] (III) Mixed operating mode (main heating mode): As shown in FIG. 3, in the case where the target operating mode of all indoor units includes both the cooling mode and the heating mode, if the heating load of the air conditioning device is greater than the cooling load, the outdoor unit enters the main heating mode in the mixed operating 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.

[0272] In the main heating mode, the heat exchange amount of the first intermediate heat exchange assembly 41 is greater than that of the second intermediate heat exchange assembly 42, at this time, the outdoor heat exchange assembly 3 and the second intermediate heat exchange assembly 42 are connected in parallel and both act as evaporators, and the first intermediate heat exchange assembly 41 acts as a condenser. It can be understood that in the above-mentioned main heating mode, the heat exchange amount of the outdoor heat exchange assembly 3 plus the cooling load of the air conditioning equipment is equal to the heating load of the air conditioning equipment.

[0273] 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, after passing through the four-way valve 2, the high-temperature refrigerant flows through the refrigerant main line 7 and the first branch line 71 in turn and enters the first intermediate heat exchange assembly 41 to condense and release heat, thereby heating the part of the indoor unit corresponding to the first intermediate heat exchange assembly 41.

[0274] The high-temperature refrigerant becomes low-temperature refrigerant after flowing out of the first intermediate heat exchange assembly 41, part of the low-temperature refrigerant flows into the second intermediate heat exchange assembly 42 through the second branch line 72 to evaporate and absorb heat, thereby cooling the part of the indoor unit corresponding to the second intermediate heat exchange assembly 42, and the part of the refrigerant flows out of the second intermediate heat exchange assembly 42 and flows into the outdoor heat exchange assembly 3 through the refrigerant main line 7 to evaporate and absorb heat, and the part of the refrigerant flows out of the outdoor heat exchange assembly 3 and flows into the refrigerant main line 7 through the third branch line 73. Finally, the refrigerant flows back to the suction port of the compressor 1 through the four-way valve 2 again, completing a refrigerant cycle.

[0275] (Four) mixed working mode (main cooling mode): as shown in FIG. 4, in the case where the target working mode of all indoor units simultaneously includes cooling mode and heating mode, if the cooling load of the air conditioning equipment is greater than its heating load, the outdoor unit enters the main cooling mode in the mixed working mode, and 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.

[0276] In the main heating mode, the heat exchange amount of the first intermediate heat exchange assembly 41 is greater than that of the second intermediate heat exchange assembly 42, at this time, the outdoor heat exchange assembly 3 and the second intermediate heat exchange assembly 42 are connected in parallel and both act as evaporators, and the first intermediate heat exchange assembly 41 acts as a condenser. It can be understood that in the above-mentioned main heating mode, the heat exchange amount of the outdoor heat exchange assembly 3 plus the cooling load of the air conditioning equipment is equal to the heating load of the air conditioning equipment.

[0277] At this time, the flow path of the refrigerant in the outdoor unit is as follows: high-temperature refrigerant flows out of the discharge port of the compressor 1, and 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 assembly 3 to condense and release heat, and the other path of the high-temperature refrigerant flows through the second intermediate heat exchange assembly 42 through the third branch 73 to condense and release heat, thereby heating the part of the indoor unit corresponding to the second intermediate heat exchange assembly 42. After condensing and releasing heat, the two paths of the high-temperature refrigerant become low-temperature refrigerant and converge into the first branch 71. The low-temperature refrigerant flows through the first intermediate heat exchange assembly 41 to evaporate and absorb heat, thereby cooling the part of the indoor unit corresponding to the first intermediate heat exchange assembly 41.

[0278] Finally, after the refrigerant flows out of the first intermediate heat exchange assembly 41, it is again returned to the suction port of the compressor 1 through the four-way valve 2, completing a refrigerant cycle.

[0279] (Five) First defrosting mode: As shown in FIG. 5, when it is detected that the outdoor heat exchange assembly 3 is frosted due to excessively low temperature, the outdoor unit enters the first defrosting mode for defrosting the outdoor heat exchange assembly 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.

[0280] The flow path of the refrigerant is as follows: high-temperature refrigerant flows from the discharge port of the compressor 1 to the four-way valve 2, enters the outdoor heat exchange assembly 3 through the four-way valve 2, thereby heating and defrosting the outdoor heat exchange assembly 3. The low-temperature refrigerant after defrosting flows back to the suction port of the compressor 1 through the fourth branch 74 and the four-way valve 2 in turn, completing a defrosting cycle.

[0281] (Six) Second defrosting mode: As shown in FIGS. 6 and 7, in the case where the outdoor unit includes a first outdoor three-way valve 86 and a 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, the system can realize targeted defrosting of the first outdoor heat exchange device 31 or the second outdoor heat exchange device 32 by controlling the interface communication relationship of the first outdoor three-way valve 86 and the second outdoor three-way valve 87.

[0282] For example, as shown in FIG. 6, when the first interface of the first outdoor three-way valve 86 is in communication with the second interface, and the second interface of the second outdoor three-way valve 87 is in communication with the third interface, the system performs targeted defrosting of the first outdoor heat exchange device 31.

[0283] For another example, as shown in FIG. 7, when the first interface of the second outdoor three-way valve 87 is in communication with the second interface, and the second interface of the first outdoor three-way valve 86 is in communication with the third interface, the system performs targeted defrosting of the second outdoor heat exchange device 32.

[0284] (vii) Anti-freezing mode: the anti-freezing mode is a mode in which one of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 is heated and the other is cooled. The connection relationship and the refrigerant flow path of the anti-freezing mode are similar to those of the main heating mode or the main cooling mode, and the present application will not be described here.

[0285] It should be noted that the application scenario of the anti-freezing mode is that when it is detected that the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 has a risk of freezing due to excessively low temperature, the outdoor unit performs anti-freezing operation (i.e. heating) on the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42.

[0286] The control method, control device and air conditioning equipment of the present application will be described below with reference to the accompanying drawings. Before the embodiments of the present application are described in detail, the entire application scenario will be described. The control method, control device, electronic equipment and computer readable storage medium of the air conditioning equipment of the embodiments of the present application can be applied to the local air conditioning equipment, the cloud platform in the Internet field, or the cloud platform in other types of Internet field, or can also be applied to third party equipment. The third party equipment includes mobile phones, tablet computers, notebook computers, vehicle-mounted computers and other smart terminals of various types.

[0287] The control method suitable for air conditioning equipment will be described below. It should be understood that the control method of the embodiments of the present application can also be applied to the cloud platform and the third party equipment.

[0288] The control method of the air conditioning equipment according to the second aspect of the present application comprises:

[0289] Upon receiving a working instruction to enter an anti-freezing mode, an anti-freezing component in the air conditioning equipment is obtained;

[0290] According to the anti-freezing component, the working state of the outdoor unit is controlled;

[0291] The anti-freezing component includes the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42.

[0292] The control device of the air conditioning equipment according to the third aspect of the present application comprises:

[0293] The obtaining module obtains an anti-freezing component in the air conditioning equipment upon receiving a working instruction to enter an anti-freezing mode;

[0294] The control module controls the working state of the outdoor unit according to the anti-freezing component. The anti-freezing component includes the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42.

[0295] Further, the control method of the air conditioning device according to the second aspect of the present application preferably comprises:

[0296] In step S1, the target operating mode of each indoor unit and the indoor load condition are obtained, and the outdoor load condition of the outdoor unit is obtained

[0297] In step S2, the outdoor unit is controlled to enter different outdoor operating modes according to the target operating mode of each indoor unit.

[0298] In step S3, the working state of the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 is controlled according to the indoor load condition and the outdoor load condition in different outdoor operating modes.

[0299] The control method of the air conditioning device according to the embodiment of the present application has the following specific working process and principle: First, the air conditioning device collects the target operating mode (i.e. the user-set cooling or heating mode) of each indoor unit and the indoor load condition (such as indoor temperature, humidity, personnel activity, etc.). At the same time, the system also obtains the outdoor load condition of the outdoor unit, which usually includes environmental parameters such as external temperature, humidity, solar radiation intensity, etc. These data are crucial for determining the operating mode of the outdoor unit.

[0300] According to the collected target operating mode of the indoor unit, the system intelligently judges and controls the outdoor unit to enter different operating modes. For example, if all indoor units require cooling mode, the outdoor unit will be adjusted to full cooling mode, at which time the main task of the outdoor unit is to transfer heat from the indoor to the outdoor through the compressor 1 and the outdoor heat exchange component 3. Conversely, if the indoor unit requires heating, the outdoor unit enters full heating mode, at which time the outdoor unit absorbs heat from the outside and transfers it to the indoor through reverse circulation.

[0301] After determining the operating mode of the outdoor unit, the system dynamically adjusts the working state of the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 according to the real-time indoor load condition and outdoor load condition. For example, in the main cooling mode, if the cooling demand of the indoor unit is greater than the heating demand, the system will make the first intermediate heat exchange component 41 operate in cooling mode, while the second intermediate heat exchange component 42 may operate in heating mode to meet the individualized needs of different indoor units. The system will intelligently select whether to start one of the intermediate heat exchange components or make both work, or even adjust the operating load ratio of the two, to achieve the optimal balance of energy utilization and comfort.

[0302] In summary, the air conditioning equipment control method of the present application realizes fine management of cold and heat demand in the multi-connected system by real-time collection and analysis of indoor and outdoor load conditions, intelligent regulation and control of the working mode of the outdoor unit and the operating state of the intermediate heat exchange assembly. This method not only improves energy utilization efficiency, but also enhances the flexibility and response speed of the system, ensuring the comfort experience of users under different environmental conditions. By avoiding direct entry of refrigerant into the indoor, it also effectively reduces the safety risk and improves the safety and reliability of the overall system operation.

[0303] According to some embodiments of the present application, the step of controlling the outdoor unit to enter different outdoor working modes according to the target working mode of each indoor unit specifically includes:

[0304] In the case where the target working mode of the running indoor unit is all cooling mode, the outdoor unit is controlled to enter full cooling mode, and in the full cooling mode, the first valve 81 and / or the second valve 82 and the fourth valve 84 are controlled to be open, and the third valve 83 and the fifth valve 85 are controlled to be closed;

[0305] Or, in the case where the target working mode of the running indoor unit is all heating mode, the outdoor unit is controlled to enter full heating mode, and in the full heating mode, the first valve 81 and / or the second valve 82 and the fourth valve 84 are controlled to be open, and the third valve 83 and the fifth valve 85 are controlled to be closed;

[0306] Or, in the case where the target working mode of the running indoor unit includes both cooling mode and heating mode, the outdoor unit is controlled to enter mixed working mode, and in the mixed working mode, the first valve 81, the second valve 82 and the third valve 83 are controlled to be open, and the fourth valve 84 and the fifth valve 85 are controlled to be closed.

[0307] According to some embodiments of the present application, the heat exchange capacity of the first intermediate heat exchange assembly 41 is greater than or equal to that of the second intermediate heat exchange assembly 42, and the step of controlling the working state of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 according to the indoor load condition and the outdoor load condition specifically includes:

[0308] In the full cooling mode or the full heating mode, if the total indoor load of all running indoor units is less than or equal to any one of the first outdoor load of the first intermediate heat exchange assembly 41 and the second outdoor load of the second intermediate heat exchange assembly 42, the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 is controlled to operate, and at this time, any one of the first valve 81 and the second valve 82 is controlled to be open;

[0309] In the full cooling mode or the full heating mode, if the total indoor load of all running indoor units is greater than the first outdoor load of the first intermediate heat exchange assembly 41 and greater than the second outdoor load of the second intermediate heat exchange assembly 42, the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 are controlled to run simultaneously, and at this time, the first valve 81 and the second valve 82 are controlled to open simultaneously;

[0310] In the full cooling mode or the full heating mode, if the total indoor load of all running indoor units is less than the first outdoor load of the first intermediate heat exchange assembly 41 and less than the second outdoor load of the second intermediate heat exchange assembly 42, the second intermediate heat exchange assembly 42 is controlled to run, and at this time, the first valve 81 is controlled to close and the second valve 82 is controlled to open;

[0311] In the full cooling mode or the full heating mode, if the total indoor load of all running indoor units is less than the first outdoor load of the first intermediate heat exchange assembly 41 and greater than the second outdoor load of the second intermediate heat exchange assembly 42, the first intermediate heat exchange assembly 41 is controlled to run, and at this time, the first valve 81 is controlled to open and the second valve 82 is controlled to close;

[0312] In the mixed working mode, the total indoor cooling load and the total indoor heating load of all running indoor units are obtained, and if the total indoor cooling load is greater than the total indoor heating load, the first intermediate heat exchange assembly 41 is controlled to be in the cooling state and the second intermediate heat exchange assembly 42 is controlled to be in the heating state;

[0313] In the mixed working mode, the total indoor cooling load and the total indoor heating load of all running indoor units are obtained, and if the total indoor cooling load is less than the total indoor heating load, the first intermediate heat exchange assembly 41 is controlled to be in the heating state and the second intermediate heat exchange assembly 42 is controlled to be in the cooling state.

[0314] In the above embodiment, for the full cooling / full heating mode: when the total indoor load of all running indoor units does not exceed the heat exchange capacity of the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42, only one of the heat exchange assemblies is opened, and at this time, the first valve 81 or the second valve 82 connected to the assembly is opened, and the other valve is closed.

[0315] If the total indoor load exceeds the individual heat exchange capacity of any heat exchange assembly, the system will simultaneously start the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42, and at this time, the first valve 81 and the second valve 82 are opened simultaneously to jointly bear the cooling or heating load.

[0316] For the mixed working mode: when the cooling demand of the indoor unit is higher than the heating demand, the system sets the first intermediate heat exchange assembly 41 to the cooling mode and the second intermediate heat exchange assembly 42 to the heating mode to adapt to the cooling and heating demands of different indoor units.

[0317] On the contrary, if the heating demand of the indoor unit is higher than the cooling demand, the first intermediate heat exchange component 41 will be set to the heating mode, while the second intermediate heat exchange component 42 is set to the cooling mode, also satisfying the high-efficiency operation under mixed demand.

[0318] In this way, through the above control strategy, the system can intelligently allocate and adjust the working states of the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 in different operating modes to meet the cooling or heating demand of the indoor unit, while optimizing energy utilization and improving the overall system operating efficiency and energy saving effect. This control method fully utilizes the larger heat exchange capacity of the first intermediate heat exchange component 41 and the auxiliary capacity of the second intermediate heat exchange component 42, ensuring the flexibility and adaptability of the system when facing complex load conditions.

[0319] According to some embodiments of the present application, the control method of the air conditioning equipment further comprises:

[0320] receiving a working instruction to control to enter a defrosting mode or an anti-freezing mode, and obtaining a component to be defrosted or an anti-freezing component in the air conditioning equipment;

[0321] controlling the working state of the outdoor unit according to the component to be defrosted or the anti-freezing component.

[0322] The component to be defrosted includes the outdoor heat exchange component, and the anti-freezing component includes the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42.

[0323] In some specific embodiments, the step of controlling the working state of the outdoor unit according to the component to be defrosted or the anti-freezing component specifically comprises:

[0324] in the defrosting mode;

[0325] In the case that the component to be defrosted is the outdoor heat exchange component 3, the fifth valve 85 is controlled to be opened, and the first valve 81, the second valve 82, the third valve 83 and the fourth valve 84 are controlled to be closed. At this time, the outdoor unit is in the first defrosting mode.

[0326] In yet some specific embodiments, when the outdoor heat exchange component 3 includes the first outdoor heat exchange device 31 and the second outdoor heat exchange device 32, and the outdoor unit further includes the first outdoor three-way valve 86 and the second outdoor three-way valve 87, the step of controlling the working state of the outdoor unit according to the component to be defrosted or the anti-freezing component specifically comprises:

[0327] in the defrosting mode;

[0328] In the case that the component to be defrosted is the first outdoor heat exchange device 31, the first valve 81, the second valve 82, the third valve 83, the fourth valve 84 and the fifth valve 85 are all controlled to be closed, and the first interface of the first outdoor three-way valve 86 is controlled to be communicated with the second interface, and the second interface of the second outdoor three-way valve 87 is controlled to be communicated with the third interface. At this time, the outdoor unit is in the second defrosting mode.

[0329] Alternatively, in the case that the component to be defrosted is the second outdoor heat exchange device 32, the first valve 81, the second valve 82, the third valve 83, the fourth valve 84 and the fifth valve 85 are all controlled to be closed, and the first interface of the second outdoor three-way valve 87 is controlled to be communicated with the second interface, and the second interface of the first outdoor three-way valve 86 is controlled to be communicated with the third interface. At this time, the outdoor unit is in the second defrosting mode.

[0330] Alternatively, in the case that the component to be defrosted is the first outdoor heat exchange device 31 and / or the second outdoor heat exchange device 32, the first valve 81 and / or the second valve 82 are controlled to be opened together with the fourth valve 84, and the third valve 83 and the fifth valve 85 are controlled to be closed.

[0331] In some other embodiments, according to the component to be defrosted or the anti-freezing component, the step of adjusting the working state of the outdoor unit further comprises:

[0332] In the anti-freezing mode, in the case that the anti-freezing component is the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42, the outdoor unit is controlled to enter the anti-freezing mode. At this time, the connection relationship inside the outdoor unit is similar to that in the main heating mode or the main cooling mode, which will not be described herein.

[0333] For example, in the case that the anti-freezing component is the first intermediate heat exchange assembly 41, the first valve 81, the second valve 82 and the third valve 83 are controlled to be opened and the fourth valve 84 is controlled to be closed, and the first intermediate heat exchange assembly 41 is controlled to be in heating operation and the second intermediate heat exchange assembly 42 is controlled to be in cooling operation.

[0334] For another example, in the case that the anti-freezing component is the second intermediate heat exchange assembly 42, the first valve 81, the second valve 82 and the third valve 83 are controlled to be opened and the fourth valve 84 is controlled to be closed, and the first intermediate heat exchange assembly 41 is controlled to be in cooling operation and the second intermediate heat exchange assembly 42 is controlled to be in heating operation.

[0335] For another example, in the case that the anti-freezing component is the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42, the first valve 81 and / or the second valve 82 are controlled to be opened together with the fourth valve 84, the third valve 83 and the fifth valve 85 are controlled to be closed, and the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42 are controlled to be in heating operation.

[0336] As shown in FIG. 8, the control device of the air conditioning equipment according to the third embodiment of the present application comprises:

[0337] The acquisition module 110 is configured to acquire the target working mode of each indoor unit and the indoor load condition, and acquire the outdoor load condition of the outdoor unit.

[0338] The first control module 120 is configured to control the outdoor unit to enter different outdoor working modes according to the target working mode of each indoor unit.

[0339] The second control module 130 is configured to control the working state of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 according to the indoor load condition and the outdoor load condition in different outdoor working modes.

[0340] The present application provides an air conditioner and a control method based on the air conditioner. All the contents described below can be correspondingly referred to the air conditioning system and its control method, the air conditioning equipment and its control method and control device described above.

[0341] As shown in FIGS. 1-8, the air conditioner according to the first embodiment of the present application comprises a plurality of indoor units, an outdoor unit, a detection device 200 and a control device 100.

[0342] The outdoor unit comprises a compressor 1, a four-way valve 2, an outdoor heat exchange assembly 3, a first intermediate heat exchange assembly 41 and a second intermediate heat exchange assembly 42 connected by a refrigerant pipeline. The refrigerant pipeline comprises a main refrigerant line 7, a first branch line 71 and a second branch line 72. The first branch line 71 and the second branch line 72 are connected in parallel and both communicate with the main refrigerant line 7. The first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 are arranged on the first branch line 71 and the second branch line 72 respectively. The outdoor heat exchange assembly 3 is arranged on the main refrigerant line 7.

[0343] Each indoor unit comprises an indoor heat exchange assembly 9 connected by a water pipeline 91. The water pipeline 91 of each indoor unit can selectively flow through the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42.

[0344] The detection device 200 is configured to detect the indoor load condition of the indoor unit and the outdoor load condition of the outdoor unit. The control device 100 is connected with the detection device 200 and comprises an acquisition module 110 and a control module. The acquisition module 110 is configured to acquire the target working mode of each indoor unit, the indoor load condition and the outdoor load condition. The control module is configured to control the working state of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 according to the target working mode of each indoor unit, the indoor load condition and the outdoor load condition.

[0345] It can be understood that in the present application, the indoor unit and the outdoor unit are 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.

[0346] The outdoor unit is a refrigerant flow path system, and the internal filler is refrigerant (for example, R32 or R454B refrigerant). Specifically, in the outdoor unit, the four interfaces of the four-way valve 2 are connected to the outdoor heat exchange assembly 3, the convergence 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 line 7, and the refrigerant performs refrigeration cycle or heating cycle between the compressor 1, the outdoor heat exchange assembly 3, and the intermediate heat exchange assembly (including the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42) through the refrigerant main line 7.

[0347] The indoor unit is a water flow path system, and the internal filler is water (it should be noted that the indoor unit can also be other medium flow path systems, and the internal filler can also be other media, which are not specially limited in the present application). Specifically, the number of indoor units is one, two, or more, each indoor unit includes a water pipeline 91 and an indoor heat exchange assembly 9, the water pipeline 91 flows through the intermediate heat exchange assembly (including the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42) and forms a water circulation loop with the indoor heat exchange assembly 9. At this time, the water circulation loop can take away the cold or heat in the intermediate heat exchange assembly (including the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42) and supply cold or heat to the indoor heat exchange assembly 9, thereby realizing refrigeration or heating of the indoor unit.

[0348] From the above, in the present application, 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, the possibility of the refrigerant directly entering the indoor environment is eliminated, the potential explosion risk caused by refrigerant leakage is effectively prevented, and the safety of the living or working environment is improved.

[0349] Further, in the present application, the outdoor unit part integrates the compressor 1, the four-way valve 2, the outdoor heat exchange assembly 3, and two key assemblies (the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42), which are connected through a carefully designed refrigerant pipeline system. The refrigerant pipeline is ingeniously divided into one main line and two parallel branch lines, which are connected to the first and second intermediate heat exchange assemblies 42, respectively. Such a design gives the system the ability to flexibly allocate refrigerant according to different needs of the operating mode, thereby achieving optimal performance between heating and cooling modes.

[0350] For example, in heating mode, the high-temperature and high-pressure refrigerant discharged by the compressor 1 is guided by the four-way valve 2, first entering the outdoor heat exchange assembly 3 to release heat, and then flowing through the refrigerant pipeline to the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42. The intermediate heat exchange assemblies transfer the heat of the refrigerant to the water in the water pipeline 91, which then delivers the heat to the indoor heat exchange assembly 9 of the indoor unit, ultimately providing warmth to the indoor environment. In cooling mode, the process is reversed, with the refrigerant absorbing heat and then releasing it in the outdoor heat exchange assembly 3 to achieve cooling effect.

[0351] Each indoor unit has its own indoor heat exchange assembly 9, which are connected through a network of water pipelines 91. The design of the water pipelines 91 is particularly noteworthy as it allows each indoor unit to selectively flow through either the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42. This means that the system can independently control the supply of cold or hot sources based on the actual needs of each indoor unit. Whether heating or cooling, the system can accurately match changes in the indoor environment, providing personalized temperature regulation.

[0352] Most importantly, the detection device 200 and control device 100 installed in the air conditioner of the present invention can implement intelligent control strategies based on the air conditioner. The detection device 200 is responsible for collecting data about the internal and external environment of the air conditioning system, including but not limited to: (1) Indoor load condition: This refers to the actual heat or cold load of the room where the indoor unit is located, which can be evaluated by detecting indoor temperature, humidity and other environmental parameters. The indoor load condition reflects the amount of cooling or heating that the indoor unit needs to provide. (2) Outdoor load condition: This involves the working environment of the outdoor unit, including outdoor temperature, humidity, etc., as well as the heat exchange performance of the outdoor unit itself. The outdoor load condition affects the heat exchange efficiency and required power of the outdoor unit.

[0353] The detection device 200 may contain various sensors such as temperature sensors, humidity sensors, pressure sensors, etc., which are distributed at different locations in the air conditioning system, monitoring and collecting data in real time. These data are then transmitted to the control device 100 for further processing and decision-making.

[0354] The control device 100 receives information from the detection device 200 and decides the best operation of the system according to pre-set algorithms or rules. The main responsibilities of the control device 100 include target working mode identification, load analysis, heat exchanger working state adjustment, and coordination of indoor unit and outdoor unit operation.

[0355] Specifically, the control device 100 needs to identify the target operating mode of each indoor unit, i.e., the cooling mode, the heating mode, or the dehumidification mode, etc. Based on the indoor and outdoor load data provided by the detection device 200, the control device 100 analyzes the current load demand and determines whether to increase or decrease the supply of cold or heat. According to the result of load analysis, the control device 100 will decide whether the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 should be in the cooling mode, the heating mode, or other modes. It may need to adjust the operating parameters of the heat exchanger, such as water flow rate, valve opening, etc., to achieve the best heat exchange effect.

[0356] In addition, the control device 100 also needs to ensure the coordination between the indoor unit and the outdoor unit, such as dynamically adjusting the output of the outdoor unit according to the demand of the indoor unit, to ensure the overall operation of the system is efficient and stable.

[0357] From the above, on the one hand, through the design of the main road and branch road of the refrigerant pipeline, the system can flexibly adjust the operating state of the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 according to the actual load demand, realize the optimal distribution of refrigerant, and improve the overall efficiency. In addition, since each indoor unit can independently select the first intermediate heat exchange component 41 or the second intermediate heat exchange component 42, it means that even in the case of simultaneous heating and cooling demand, the system can meet the specific needs of each room through reasonable resource allocation. On the other hand, through the cooperative work of the detection device 200 and the control device 100, it ensures that the air conditioning system can automatically adjust according to the real-time environmental changes and user demand, and provide an indoor environment that is both efficient and comfortable.

[0358] In the related art, with the reduction of global GWP requirements, how to use different air conditioners and refrigerants has become a difficult choice for major enterprises. Traditional air conditioners achieve the purpose of refrigeration or heating through the circulation of refrigerant between the outdoor unit and the indoor unit or the delivery of water-fluorine heat exchange medium between the outdoor unit and the indoor unit to meet the air conditioning demand of buildings. The current scheme for realizing simultaneous refrigeration and heating mainly adopts a three-pipeline form. The three-pipeline scheme requires a long refrigerant pipeline, and the material of the pipeline is copper, which has a high pipeline cost. At the same time, with the gradual popularization and application of new refrigerants R32 and R454B, the resulting indoor refrigerant leakage poses a potential risk of explosion.

[0359] Therefore, in order to solve the technical defects existing in the above related art, the present application provides an air conditioner, which has at least the following advantages compared with the related art.

[0360] (1) Enhanced safety: By limiting the circulation of refrigerant to the outdoor, the risk of indoor leakage and potential explosion caused by the use of A2L level refrigerants such as R32 or R454B is avoided, significantly improving the safety of the indoor environment.

[0361] (2) Cost savings: The three-pipe solution adopted by traditional multi-split systems requires a large amount of copper refrigerant piping, which is costly. The water-air heat exchange technology of the present invention eliminates the need for expensive copper materials for long-distance piping from indoor to outdoor, effectively reducing installation and maintenance costs.

[0362] (3) Efficiency improvement: The multi-split system of the present invention can simultaneously achieve cooling and heating for self-use, which means that it can maintain high efficiency in both cooling and heating modes, avoiding the functional loss problem that traditional systems may encounter under simultaneous cooling and heating demand, thereby improving the overall use efficiency of the system.

[0363] (4) Flexibility and reliability: The indoor unit can independently switch between cooling or heating modes according to user demand, and can be flexibly controlled through three-way valves or stop valves. At the same time, the design of the intermediate heat exchange components takes into account the possibility of different sizes and parallel use to adapt to various load demands, enhancing the flexibility and reliability of the system.

[0364] (5) Intelligent control: The system has intelligent mode control, which can automatically adjust the operating state according to the operating mode and load of the indoor unit, such as full cooling, full heating, main cooling or main heating mode, defrosting mode and anti-freezing mode, to ensure that the system can operate efficiently under various conditions.

[0365] (6) Maintenance convenience: Since the refrigerant only exists on the outdoor side, the maintenance work on the indoor side is reduced, and the frequency of maintenance due to refrigerant leakage is also reduced, making the system easier to install and set up.

[0366] In summary, the present invention not only solves the problems of cost, safety and efficiency of traditional multi-split air conditioners, but also provides a more intelligent and flexible control scheme, improving user experience and overall system performance.

[0367] As shown in FIG. 1, 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.

[0368] In this embodiment, the first valve 81 can control the on-off of the refrigerant in the first branch 71, i.e., 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, i.e., the second valve 82 can control whether the refrigerant flows through the second intermediate heat exchange component 42.

[0369] 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, thereby preventing the heat exchange process on that branch; when the valve is open, the refrigerant can flow through and participate in heat exchange, so that heat can be transferred from the outdoor unit to the indoor unit or vice versa.

[0370] On the other hand, when the system needs to switch from cooling mode to heating mode, or adjust the operation mode according to the different needs of the indoor unit (cooling or heating), by controlling the opening and closing states of the first valve 81 and the second valve 82, the flexible switching between the intermediate heat exchange assemblies can be realized, ensuring that the system operates in the most efficient mode according to the needs.

[0371] In addition, according to the system load, the first valve 81 and the second valve 82 can help adjust the distribution of refrigerant, so that the refrigerant flow matches the cooling or heating needs 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 one intermediate heat exchange assembly; while in the case of high load, both valves may need to be opened so that both intermediate heat exchange assemblies work simultaneously, improving system efficiency.

[0372] It should also be noted that during maintenance or when a certain heat exchange assembly fails, the corresponding valve can be closed to isolate the problem assembly without affecting the operation of the entire system, thereby reducing downtime and maintenance costs.

[0373] In some embodiments, the first valve 81 is a first expansion valve and a shutoff valve or a one-way valve is connected in parallel at both ends of the first valve 81, and the second valve 82 is a second expansion valve and a shutoff valve or a one-way valve is connected in parallel at both ends of the second valve 82.

[0374] In this way, without the need for the first expansion valve and the second expansion valve to throttle, the shutoff valve or the one-way valve can be opened to reduce the resistance of the refrigerant flow, ensuring smooth flow of the refrigerant.

[0375] As shown in FIG. 1, according to some embodiments of the present application, the refrigerant pipeline further comprises a third branch 73, one end of the third branch 73 is connected to the part of the refrigerant main line 7 between the four-way valve 2 and the outdoor heat exchange assembly 3, the other end of the third branch 73 is connected to the second branch 72, and a third valve 83 is further arranged on the third branch 73; and a fourth valve 84 is further arranged on the part of the second branch 72 between the refrigerant main line 7 and the third branch 73.

[0376] 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 assembly 41 and the second intermediate heat exchange assembly 42.

[0377] In the air conditioning system of the present application, by adding the third branch 73 and the corresponding third and fourth valves 84, the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 not only can work independently, but also can be converted between the parallel and series states, thereby increasing the flexibility and efficiency of the system. The two states of parallel and series will be explained respectively, and the working modes will be classified based on this.

[0378] For example, in parallel state, the third valve 83 is closed and the fourth valve 84 is opened. This means that the refrigerant, after passing through the outdoor heat exchange assembly 3, can be directly split into the first branch 71 and the second branch 72 through the fourth valve 84, and then 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 that require a large amount of refrigerant to cool or heat at the same time.

[0379] For another example, in series state, the third valve 83 is opened and the fourth valve 84 is closed. At this time, the refrigerant, after passing through the outdoor heat exchange assembly 3, will first enter the second intermediate heat exchange assembly 42 through the third branch 73, and then reach the first intermediate heat exchange assembly 41 through the second branch 72. In this mode, the refrigerant first flows through one heat exchange assembly and then flows into another, which is suitable for situations that require to strengthen the heat exchange effect or control the refrigerant flow.

[0380] As shown in FIG. 8, according to some embodiments of the present application, the control device 100 includes a first control module 120 and a second control module 130, wherein the first control module 120 is configured to control the outdoor unit to enter different outdoor working modes according to the target working mode of each indoor unit; and the second control module 130 is configured to control the working state of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 according to the indoor load condition and the outdoor load condition in different outdoor working modes.

[0381] Specifically, the different working modes of the outdoor unit include: full refrigeration mode, full heating mode, main refrigeration mode, and main heating mode.

[0382] For example, in full refrigeration mode, all indoor units are in refrigeration state. The system detects the total load demand and selects parallel or series mode according to the load size. If the load is small, only one heat exchange assembly may be turned on; if the load is large, parallel mode may be used to let two heat exchange assemblies work at the same time.

[0383] For another example, the full heating mode is similar to the full refrigeration mode, except that the direction of heat exchange is reversed. The system selects the most effective heat exchange assembly operation mode according to the total heating demand to achieve the best heating effect.

[0384] For another example, when there are both refrigeration and heating demands in the indoor units, and the refrigeration demand is dominant, the system enters the main refrigeration mode. At this time, the first intermediate heat exchange assembly 41 may be used for refrigeration, and the second intermediate heat exchange assembly 42 is used for heating, depending on the proportion of cold and heat demand and system settings.

[0385] For example, when the heating demand is dominant, the system enters the main heating mode. In this mode, the first intermediate heat exchange component 41 can be used for heating, while the second intermediate heat exchange component 42 is used for cooling to meet the mixed demand of the indoor unit.

[0386] In summary, through the above design, the air conditioning system of the present application can intelligently adjust the working state of the heat exchange components according to different operating conditions, thereby meeting the indoor temperature regulation demand while maximizing the use of energy and achieving high efficiency of the system.

[0387] According to some embodiments of the present application, the heat exchange capacity of the first intermediate heat exchange component 41 is greater than or equal to that of the second intermediate heat exchange component 42.

[0388] The design of the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 takes into account the heat exchange demand of the system in different operating modes. The heat exchange capacity of the first intermediate heat exchange component 41 is designed to be greater than or equal to that of the second intermediate heat exchange component 42, mainly to meet the higher heat exchange demand in the main heating or main cooling mode. This is because, in the main heating mode, the outdoor unit needs more heat to cope with the heating demand of the indoor unit, while in the main cooling mode, the outdoor unit needs more cooling capacity to cope with the cooling demand of the indoor unit. The larger heat exchange capacity of the first intermediate heat exchange component 41 can ensure that the system can effectively cope with higher loads in these modes.

[0389] This design takes into account the heat exchange efficiency of the system in different operating modes, i.e. full cooling, full heating, main cooling and main heating modes. In the full cooling or full heating mode, if the load is less than or equal to 50% of the total load, the system can choose to run any one of the intermediate heat exchange components to save energy; when the load exceeds 50%, both intermediate heat exchange components will run simultaneously to meet the higher heat exchange demand. In the main cooling or main heating mode, the system will choose to run the first intermediate heat exchange component 41 or the second intermediate heat exchange component 42, or both, according to the size of the cooling and heating load, to achieve the optimal heat exchange efficiency and energy utilization.

[0390] In addition, the size difference between the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 also takes into account the low probability of both the cooling and heating loads reaching 50% when they are running simultaneously. By adjusting the size of the two heat exchange components, the operating efficiency of the system can be improved under most operating conditions, avoiding waste of resources.

[0391] The technical solution of the present application optimizes the heat exchange capacity and operation strategy of the intermediate heat exchange components, so that the system can achieve high efficiency and energy saving effect in various operation modes, especially in the simultaneous refrigeration and heating demand scenario, the system can intelligently select the appropriate heat exchange component according to the actual load condition, ensuring the flexibility and economy of the system operation. This design not only improves the overall performance of the air conditioner, but also reduces the operating cost to a certain extent and improves the user experience.

[0392] As shown in FIG. 1, according to some embodiments of the present application, the refrigerant pipeline further comprises a fourth branch 74, which is connected in parallel with the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42, and a fifth valve 85 is arranged on the fourth branch 74, wherein the fifth valve 85 is used to control whether to defrost the outdoor heat exchange component 3.

[0393] In the air conditioning system of the present application, 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.

[0394] Defrosting mode is one of the important functions of the air conditioning system when it operates in cold weather. When the surface of the outdoor heat exchange component 3 is frosted, it will affect the heat exchange efficiency, thereby reducing 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, thereby melting 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.

[0395] Specifically, the operation logic of the defrosting mode is as follows: when the system detects that the defrosting condition is met, it will close the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 and stop the refrigeration or heating operation. The controller opens the fifth valve 85, and the refrigerant flows directly to the outdoor heat exchange component 3 through the fourth branch 74. When the frost layer on the outdoor heat exchange component 3 melts and the temperature returns to the normal range, the system will close the fifth valve 85 again and open the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 to restore the refrigeration or heating function.

[0396] This design ensures that the system can still maintain good running efficiency and comfort in winter or low temperature environment, avoids the decline of heat exchange efficiency caused by frost, and reduces the need for manual intervention, thereby improving the automation degree and maintenance convenience of the system.

[0397] As shown in FIG. 1, according to some embodiments of the present application, the water pipeline 91 can selectively flow through the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 through the first indoor three-way valve 92 and the second indoor three-way valve 93.

[0398] Specifically, the first indoor three-way valve 92 and the second indoor three-way valve 93 are respectively arranged at two ends of the indoor heat exchange assembly 9, wherein 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 interface connection of the first indoor three-way valve 92 and the second indoor three-way valve 93, the water pipeline 91 can selectively 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.

[0399] In other embodiments, the above-mentioned 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 groups of stop valves to realize the above-mentioned selective water pipeline 91 flow-through relationship; in addition, the structure of the three-way valve or the stop valve for switching the cooling or heating of the indoor unit can be arranged in the outdoor unit, or arranged in the indoor unit, or arranged in one or more boxes, which is mainly selected according to the installation convenience and installation cost, and the present application does not make special limitation here.

[0400] According to some embodiments of the present application, the first control module 120 is specifically configured to: in the case that the target working mode of all running indoor units is the cooling mode, control the outdoor unit to enter the full cooling mode, and in the full cooling mode, control the first valve 81 and / or the second valve 82 and the fourth valve 84 to be opened, and control the third valve 83 to be closed.

[0401] For example, as shown in FIG. 1, in the full cooling mode, in the case that the target working mode of all running indoor units is the cooling mode, the outdoor unit enters the full cooling mode. In the full cooling mode, the first valve 81 and / or the second valve 82 and the fourth valve 84 are opened, and the third valve 83 and the fifth valve 85 are closed.

[0402] 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.

[0403] At this time, the flow path of the refrigerant in the outdoor unit is as follows: the refrigerant flows out of the discharge 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 low-temperature refrigerant after being condensed and releasing heat in the outdoor heat exchange assembly 3. After flowing out of the outdoor heat exchange assembly 3, if the first valve 81 and the second valve 82 are both open, 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, thereby cooling the indoor unit. If one of the first valve 81 and the second valve 82 is open, the low-temperature refrigerant enters the first branch 71 or the second branch 72 entirely, and evaporates and absorbs heat in the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 entirely, thereby cooling the indoor unit.

[0404] Finally, the refrigerant flows out of the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42, and then flows back to the suction port of the compressor 1 through the four-way valve 2 again, thereby completing a refrigeration cycle.

[0405] It should be noted that the opening and closing of the first valve 81 and the second valve 82 described above can be controlled according to the load range of the indoor unit and the outdoor unit, which will be described in detail below, and thus will not be described in detail here.

[0406] Further, the second control module 130 is specifically configured to:

[0407] In the full refrigeration mode, if the total indoor load of all running indoor units is less than the first outdoor load of the first intermediate heat exchange assembly 41 and less than the second outdoor load of the second intermediate heat exchange assembly 42, the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 is controlled to refrigerate and run, at this time, any one of the first valve 81 and the second valve 82 is controlled to be open;

[0408] Alternatively, in the full refrigeration mode, if the total indoor load of all running indoor units is between the first outdoor load and the second outdoor load, one of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 with a larger outdoor load is controlled to refrigerate and run, and one of the first valve 81 and the second valve 82 corresponding to it is controlled to be open;

[0409] Alternatively, in the full refrigeration mode, if the total indoor load of all running indoor units is greater than the first outdoor load of the first intermediate heat exchange assembly 41 and greater than the second outdoor load of the second intermediate heat exchange assembly 42, the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 are controlled to refrigerate and run simultaneously, at this time, the first valve 81 and the second valve 82 are controlled to be open simultaneously.

[0410] In the above embodiments, for the full cooling mode: when the total indoor load of all running indoor units does not exceed the heat exchange capacity of the first intermediate heat exchange assembly 41 and does not exceed the heat exchange capacity of the second intermediate heat exchange assembly 42, only one of the heat exchange assemblies is opened and controlled to run in cooling mode, at this time, the first valve 81 or the second valve 82 connected to the assembly is opened, and the other valve is closed.

[0411] If the total indoor load exceeds the individual heat exchange capacity of one of the heat exchange assemblies but does not exceed the individual heat exchange capacity of the other heat exchange assembly, the system can start the heat exchange assembly with larger heat exchange capacity and control it to run in cooling mode, for example, the heat exchange capacity of the first intermediate heat exchange assembly 41 is larger than that of the second intermediate heat exchange assembly 42, when the total indoor load is greater than the second outdoor load and less than the first outdoor load, the first intermediate heat exchange assembly 41 is controlled to run in cooling mode and the first valve 81 is controlled to be opened.

[0412] If the total indoor load exceeds the individual heat exchange capacity of any heat exchange assembly, the system will start the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 at the same time and control both to run in cooling mode, at this time, the first valve 81 and the second valve 82 are opened at the same time to share the cooling load.

[0413] According to some embodiments of the present application, the first control module 120 is specifically configured to:

[0414] In the case where the target operating mode of all running indoor units is heating mode, the outdoor unit is controlled to enter full heating mode, and in the full heating mode, the first valve 81 and / or the second valve 82 and the fourth valve 84 are controlled to be opened, and the third valve 83 is controlled to be closed.

[0415] For example, as shown in FIG. 2, in the case where the target operating mode of all running indoor units is heating mode, the outdoor unit enters full heating mode, and in the full heating mode, the first valve 81 and / or the second valve 82 and the fourth valve 84 are opened, and the third valve 83 and the fifth valve 85 are closed.

[0416] In the full heating mode, the outdoor heat exchange assembly 3 acts as an evaporator, and the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 are connected in parallel to each other and both act as condensers.

[0417] At this time, the flow path of the refrigerant in the outdoor unit is as follows: high-temperature refrigerant flows out of the discharge port of the compressor 1, passes through the four-way valve 2, and enters the intermediate heat exchange assembly to perform condensation heat release. If the first valve 81 and the second valve 82 are both open, the high-temperature refrigerant is divided into two parts and enters the first branch 71 and the second branch 72, respectively, and performs condensation heat release in the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42, respectively, thereby heating the indoor unit. If one of the first valve 81 and the second valve 82 is open, the high-temperature refrigerant enters the first branch 71 or the second branch 72, and flows through the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 to perform condensation heat release, thereby heating the indoor unit. The high-temperature refrigerant becomes low-temperature refrigerant after flowing out of the intermediate heat exchange assembly, and flows through the outdoor heat exchange assembly 3 to perform evaporation heat absorption.

[0418] Finally, the refrigerant flows out of the outdoor heat exchange assembly 3, passes through the four-way valve 2 again, and flows back to the suction port of the compressor 1, thereby completing a heating cycle.

[0419] It should be noted that the opening and closing of the first valve 81 and the second valve 82 described above can be controlled according to the load range of the indoor unit and the outdoor unit, which will be described in detail below, and thus will not be described in detail here.

[0420] Further, the second control module 130 is specifically configured to:

[0421] In the full heating mode, if the total indoor load of all operating indoor units is less than the first outdoor load of the first intermediate heat exchange assembly 41 and less than the second outdoor load of the second intermediate heat exchange assembly 42, the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 is controlled to heat and operate, and at this time, any one of the first valve 81 and the second valve 82 is controlled to be open;

[0422] Alternatively, in the full heating mode, if the total indoor load of all operating indoor units is between the first outdoor load and the second outdoor load, one of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 with a larger outdoor load is controlled to heat and operate, and one of the first valve 81 and the second valve 82 corresponding to it is controlled to be open;

[0423] Alternatively, in the full heating mode, if the total indoor load of all operating indoor units is greater than the first outdoor load of the first intermediate heat exchange assembly 41 and greater than the second outdoor load of the second intermediate heat exchange assembly 42, the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 are controlled to heat and operate at the same time, and at this time, the first valve 81 and the second valve 82 are controlled to be open at the same time.

[0424] In the above embodiments, for the full heating mode: when the total indoor load of all operating indoor units does not exceed the heat exchange capacity of the first intermediate heat exchange assembly 41 and does not exceed the heat exchange capacity of the second intermediate heat exchange assembly 42, only one of the heat exchange assemblies is started and controlled to operate in heating mode, at this time, the first valve 81 or the second valve 82 connected to the assembly is opened, and the other valve is closed.

[0425] If the total indoor load exceeds the individual heat exchange capacity of one of the heat exchange assemblies but does not exceed the individual heat exchange capacity of the other heat exchange assembly, the system can start the heat exchange assembly with greater heat exchange capacity and control it to operate in heating mode, for example, the heat exchange capacity of the first intermediate heat exchange assembly 41 is greater than the heat exchange capacity of the second intermediate heat exchange assembly 42, when the total indoor load is greater than the second outdoor load and less than the first outdoor load, the first intermediate heat exchange assembly 41 is controlled to operate in heating mode and the first valve 81 is controlled to be opened.

[0426] If the total indoor load exceeds the individual heat exchange capacity of any heat exchange assembly, the system will start the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 at the same time and control both to operate in heating mode, at this time, the first valve 81 and the second valve 82 are opened at the same time to share the load of heating.

[0427] According to still other embodiments of the present application, the first control module 120 is specifically configured to:

[0428] In the case where the target operating mode of all operating indoor units simultaneously includes cooling mode and heating mode, the outdoor unit is controlled to enter mixed operating mode, and in the mixed operating mode, the first valve 81, the second valve 82, and the third valve 83 are controlled to be opened, and the fourth valve 84 is controlled to be closed.

[0429] For example, as shown in FIG. 3, in the case where the target operating mode of all operating indoor units simultaneously includes cooling mode and heating mode, if the heating load of the air conditioner is greater than the cooling load, the outdoor unit enters the main heating mode in the mixed operating 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.

[0430] In the main heating mode, the heat exchange amount of the first intermediate heat exchange is greater than the heat exchange amount of the second intermediate heat exchange assembly 42, at this time, the outdoor heat exchange assembly 3 and the second intermediate heat exchange assembly 42 are connected in parallel and both act as evaporators, and the first intermediate heat exchange assembly 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 assembly 3 plus the cooling load of the air conditioner is equal to the heating load of the air conditioner.

[0431] At this time, the flow path of the refrigerant in the outdoor unit is as follows: the high-temperature refrigerant flows out of the discharge port of the compressor 1, and after passing through the four-way valve 2, the high-temperature refrigerant successively flows through the refrigerant main line 7 and the first branch line 71 and enters the first intermediate heat exchange assembly 41 to perform condensation heat release, thereby heating the part of the indoor unit corresponding to the first intermediate heat exchange assembly 41.

[0432] After the high-temperature refrigerant flows out of the first intermediate heat exchange assembly 41, it becomes low-temperature refrigerant, part of which flows into the second intermediate heat exchange assembly 42 through the second branch line 72 to perform evaporation heat absorption, thereby cooling the part of the indoor unit corresponding to the second intermediate heat exchange assembly 42, and after the part of the refrigerant flows out of the second intermediate heat exchange assembly 42, it converges into the refrigerant main line 7 through the third branch line 73; another part of the low-temperature refrigerant flows into the outdoor heat exchange assembly 3 through the refrigerant main line 7 to perform evaporation heat absorption, and after the part of the refrigerant flows out of the outdoor heat exchange assembly 3, it converges into the refrigerant main line 7 with the refrigerant in the third branch line 73. Finally, the refrigerant flows back to the suction port of the compressor 1 through the four-way valve 2 again, completing a refrigerant cycle.

[0433] For example, as shown in FIG. 4, in the case where the target operating modes of all the operating indoor units simultaneously include the cooling mode and the heating mode, if the cooling load of the air conditioner is greater than the heating load thereof, the outdoor unit enters the main cooling mode in the mixed operating mode, and 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.

[0434] In the main cooling mode, the heat exchange amount of the first intermediate heat exchange is greater than the heat exchange amount of the second intermediate heat exchange assembly 42, at this time, the outdoor heat exchange assembly 3 and the second intermediate heat exchange assembly 42 are connected in parallel and both act as condensers, and the first intermediate heat exchange assembly 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 assembly 3 plus the heating load of the air conditioner is equal to the cooling load of the air conditioner.

[0435] At this time, the flow path of the refrigerant in the outdoor unit is as follows: the high-temperature refrigerant flows out of the discharge port of the compressor 1, and 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 assembly 3 to perform condensation heat release, and the other path of the high-temperature refrigerant flows through the second intermediate heat exchange assembly 42 through the third branch line 73 to perform condensation heat release, thereby heating the part of the indoor unit corresponding to the second intermediate heat exchange assembly 42, and after the two paths of the high-temperature refrigerant perform condensation heat release, they become low-temperature refrigerant and converge into the first branch line 71, and the low-temperature refrigerant flows through the first intermediate heat exchange assembly 41 to perform evaporation heat absorption, thereby cooling the part of the indoor unit corresponding to the first intermediate heat exchange assembly 41.

[0436] Finally, after the refrigerant flows out of the first intermediate heat exchange assembly 41, it flows back to the suction port of the compressor 1 through the four-way valve 2 again, completing a refrigerant cycle.

[0437] Further, in some embodiments, the heat exchange capacity of the first intermediate heat exchange component 41 is greater than that of the second intermediate heat exchange component 42; then the second control module 130 is specifically used for:

[0438] In the mixed operation mode, the total indoor cooling load and the total indoor heating load of all running indoor units are obtained, and if the total indoor cooling load is greater than the total indoor heating load, the first intermediate heat exchange component 41 is controlled to be in a cooling state and the second intermediate heat exchange component 42 is controlled to be in a heating state.

[0439] Alternatively, in the mixed operation mode, the total indoor cooling load and the total indoor heating load of all running indoor units are obtained, and if the total indoor cooling load is less than the total indoor heating load, the first intermediate heat exchange component 41 is controlled to be in a heating state and the second intermediate heat exchange component 42 is controlled to be in a cooling state.

[0440] For the mixed operation mode: when the cooling demand of the indoor unit is higher than the heating demand, the system sets the first intermediate heat exchange component 41 to be in a cooling mode and the second intermediate heat exchange component 42 to be in a heating mode to adapt to the cooling and heating demands of different indoor units.

[0441] Conversely, if the heating demand of the indoor unit is higher than the cooling demand, the first intermediate heat exchange component 41 is set to be in a heating mode and the second intermediate heat exchange component 42 is set to be in a cooling mode, which also meets the high-efficiency operation under mixed demand.

[0442] In this way, through the above control strategy, the system can intelligently allocate and adjust the working states of the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 in different operation modes to meet the cooling or heating demands of the indoor units, while optimizing energy utilization and improving the overall system operation efficiency and energy-saving effect. This control strategy fully utilizes the larger heat exchange capacity of the first intermediate heat exchange component 41 and the auxiliary capacity of the second intermediate heat exchange component 42, ensuring the flexibility and adaptability of the system when facing complex load conditions.

[0443] Further, in some embodiments, the heat exchange capacity of the first intermediate heat exchange component 41 is greater than that of the second intermediate heat exchange component 42; then the second control module 130 is specifically used for:

[0444] In the mixed operation mode, one of the first intermediate heat exchange component 41 and the second intermediate heat exchange component 42 is controlled to be in a cooling state and the other is controlled to be in a heating state.

[0445] In some embodiments, when the heat exchange amounts of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 are equal, the design of the system allows more flexible heat recovery and energy distribution. In the mixed operation mode, that is, when the system needs to provide both cooling and heating, the second control module 130 controls one of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 to enter the cooling state, and controls the other of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 to enter the heating state. In this mode, the system can achieve internal balance of cooling and heating loads, that is, convert the cooling demand of a part of indoor units into the heating demand of another part of indoor units, thereby effectively utilizing energy and reducing dependence on external energy.

[0446] Further, in the mixed operation mode, the second control module 130 can control the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 to enter the cooling state and the heating state alternately, that is, in actual operation, the second control module 130 can first control the first intermediate heat exchange assembly 41 to enter the cooling state and the second intermediate heat exchange assembly 42 to enter the heating state, and after a period of time, control the first intermediate heat exchange assembly 41 to switch to the heating state and the second intermediate heat exchange assembly 42 to switch to the cooling state. In this way, on the one hand, the cooling and heating demands of indoor units can be met, and on the other hand, the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 can be alternately subjected to anti-freezing treatment in the switching process, thereby avoiding freezing of the intermediate heat exchange assemblies.

[0447] As shown in FIGS. 5 to 7, according to some embodiments of the present application, the outdoor heat exchange assembly 3 includes a first outdoor heat exchange device 31 and a second outdoor heat exchange device 32, and 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 being connected to the refrigerant main pipeline 7, and the first outdoor heat exchange device 31 and the second outdoor heat exchange device 32 being arranged on the fifth branch 75 and the sixth branch 76, respectively.

[0448] In the present application, the outdoor heat exchange assembly 3 is designed to include the first outdoor heat exchange device 31 and the 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 pipeline 7, so that the first outdoor heat exchange device 31 and the second outdoor heat exchange device 32 can be independently or simultaneously operated, providing the system with higher flexibility and efficiency.

[0449] This design allows the system to selectively activate the first outdoor heat exchange device 31 or the second outdoor heat exchange device 32, or have both work simultaneously, according to different operating requirements and load conditions, to optimize energy utilization and system performance. Under low load conditions, the system can use only one outdoor heat exchange device to meet the demand, saving energy; while under high load conditions, both outdoor heat exchange devices can work simultaneously to provide additional cooling or heating capacity, ensuring efficient operation of the system.

[0450] In addition, this parallel outdoor heat exchange device configuration also improves the redundancy and reliability of the system. If one of the heat exchange devices fails or needs maintenance, the system can still continue to operate through the other heat exchange device, avoiding the possibility of the entire system shutting down, ensuring continuous service and user satisfaction.

[0451] As shown in FIGS. 6 and 7, in some specific embodiments of the present application, the outdoor unit further comprises 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 connected to the exhaust port of the compressor 1 through the fifth branch 75 and the refrigerant main line 7 in sequence, 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 the seventh branch 77.

[0452] The first interface of the second outdoor three-way valve 87 is connected to the exhaust port of the compressor 1 through the sixth branch 76 and the refrigerant main line 7 in sequence, 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 the eighth branch 78.

[0453] Among them, 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.

[0454] 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.

[0455] In the defrosting mode, the system selectively makes the high-temperature refrigerant flow through the first outdoor heat exchange device 31 or the second outdoor heat exchange device 32 by controlling the switching state of the first outdoor three-way valve 86 and the second outdoor three-way valve 87, to realize 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 component, thereby restoring the heat exchange efficiency.

[0456] For example, as shown in FIG. 6, when the first interface of the first outdoor three-way valve 86 is in communication with the second interface, and the second interface of the second outdoor three-way valve 87 is in communication with the third interface, 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 again flows back to the suction port of the compressor 1, completing a defrosting cycle.

[0457] For example, as shown in FIG. 7, when the first interface of the second outdoor three-way valve 87 is in communication with the second interface, and the second interface of the first outdoor three-way valve 86 is in communication with the third interface, 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 again flows back to the suction port of the compressor 1, completing a defrosting cycle.

[0458] The advantage of this design is that it allows the system to flexibly select the heat exchange component that needs to be defrosted during defrosting, while not affecting the normal operation of other heat exchange components, thereby improving the overall operation efficiency and stability of the system. In addition, through intelligent control of the three-way valve, rapid and accurate defrosting can be achieved, reducing defrosting time, reducing energy consumption, and improving user experience.

[0459] According to some embodiments of the present application, the air conditioner further comprises a third control module, wherein when the air conditioner receives a working instruction for entering a defrosting mode or an anti-freezing mode, and determines a component to be defrosted or an anti-freezing component in the air conditioner, the third control module is configured to control the working state of the outdoor unit according to the component to be defrosted or the anti-freezing component.

[0460] In some embodiments, the component to be defrosted includes the outdoor heat exchange assembly 3, and the anti-freezing component includes the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42.

[0461] In some embodiments, the third control module is specifically configured to:

[0462] In the defrosting mode;

[0463] In the case where the component to be defrosted is the outdoor heat exchange assembly 3, the fifth valve 85 is opened, and the first valve 81, the second valve 82, the third valve 83 and the fourth valve 84 are closed. At this time, the outdoor unit is in the first defrosting mode.

[0464] For example, as shown in FIG. 5, when it is detected that the outdoor heat exchange component 3 is frosting due to excessively low temperature, the outdoor unit enters a 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.

[0465] The flow path of the refrigerant is as follows: high-temperature refrigerant flows from the discharge port of the compressor 1 to the four-way valve 2, enters the outdoor heat exchange component 3 through the four-way valve 2, thereby heating and defrosting the outdoor heat exchange component 3, and low-temperature refrigerant after defrosting flows back to the suction port of the compressor 1 in sequence through the fourth branch 74 and the four-way valve 2, thereby completing a defrosting cycle.

[0466] In some embodiments, the third control module is specifically configured to:

[0467] In the defrosting mode;

[0468] In the case where the component to be defrosted is the outdoor heat exchange component 3, the first valve 81, the second valve 82 and the fourth valve 84 are controlled to be opened, and the four-way valve 2 is controlled to be reversed and the third valve 83 is controlled to be closed, so as to realize four-way valve reversing defrosting.

[0469] It can be understood that the above defrosting mode is the most basic four-way valve reversing defrosting mode, and this mode can also realize defrosting of the outdoor heat exchange component 3.

[0470] In some embodiments, when the outdoor heat exchange component 3 includes the first outdoor heat exchange device 31 and the second outdoor heat exchange device 32, and the outdoor unit further includes a first outdoor three-way valve 86 and a second outdoor three-way valve 87, the third control module is specifically configured to:

[0471] In the defrosting mode;

[0472] In the case where the component to be defrosted is the first outdoor heat exchange device 31, the first valve 81, the second valve 82, the third valve 83, the fourth valve 84 and the fifth valve 85 are controlled to be closed, and the first interface of the first outdoor three-way valve 86 is controlled to be in communication with the second interface, and the second interface of the second outdoor three-way valve 87 is controlled to be in communication with the third interface. At this time, the outdoor unit is in a second defrosting mode.

[0473] Alternatively, in the case where the component to be defrosted is the second outdoor heat exchange device 32, the first valve 81, the second valve 82, the third valve 83, the fourth valve 84 and the fifth valve 85 are controlled to be closed, and the first interface of the second outdoor three-way valve 87 is controlled to be in communication with the second interface, and the second interface of the first outdoor three-way valve 86 is controlled to be in communication with the third interface. At this time, the outdoor unit is in a second defrosting mode.

[0474] Specifically, as shown in FIG. 6 and FIG. 7, in the case where the outdoor unit comprises the first outdoor three-way valve 86 and the second outdoor three-way valve 87, the outdoor unit further 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, the system can realize targeted defrosting of the first outdoor heat exchange device 31 or the second outdoor heat exchange device 32 by controlling the interface communication relationship of the first outdoor three-way valve 86 and the second outdoor three-way valve 87.

[0475] For example, as shown in FIG. 6, when the first interface of the first outdoor three-way valve 86 communicates with the second interface, and the second interface of the second outdoor three-way valve 87 communicates with the third interface, the system performs targeted defrosting on the first outdoor heat exchange device 31.

[0476] For another example, as shown in FIG. 7, when the first interface of the second outdoor three-way valve 87 communicates with the second interface, and the second interface of the first outdoor three-way valve 86 communicates with the third interface, the system performs targeted defrosting on the second outdoor heat exchange device 32.

[0477] In some specific embodiments, the third control module is further configured to:

[0478] In the anti-freezing mode;

[0479] In the case where the anti-freezing component is the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42, the outdoor unit is controlled to enter a first anti-freezing mode. Specifically, the first anti-freezing mode is a mode in which one of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 heats and the other one of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 cools. The connection relationship and the refrigerant flow path of the first anti-freezing mode are similar to those of the above-mentioned main heating mode or main cooling mode, and the present application will not be described here.

[0480] For example, in the case where the anti-freezing component is the first intermediate heat exchange assembly 41, the first valve 81, the second valve 82 and the third valve 83 are controlled to be opened and the fourth valve 84 is controlled to be closed, and the first intermediate heat exchange assembly 41 is controlled to heat and run and the second intermediate heat exchange assembly 42 is controlled to cool and run.

[0481] For another example, in the case where the anti-freezing component is the second intermediate heat exchange assembly 42, the first valve 81, the second valve 82 and the third valve 83 are controlled to be opened and the fourth valve 84 is controlled to be closed, and the first intermediate heat exchange assembly 41 is controlled to cool and run and the second intermediate heat exchange assembly 42 is controlled to heat and run.

[0482] It should be noted that the application scenario of the first anti-freezing mode is that when it is detected that the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42 has frost due to excessively low temperature, the outdoor unit performs anti-freezing treatment on the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42.

[0483] In some embodiments, the third control module is further configured to:

[0484] In the anti-freezing mode;

[0485] In the case that the anti-freezing component is the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42, the first valve 81 and / or the second valve 82 and the fourth valve 84 are controlled to be opened, the third valve 83 and the fifth valve 85 are controlled to be closed, and the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42 is controlled to be in the heating operation.

[0486] The anti-freezing mode of the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42 described above is the basic anti-freezing mode of the four-way valve reversing defrosting, that is, when the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42 may freeze due to being operated in the refrigeration mode for too long, the four-way valve can be controlled to reverse at this time so that the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42 is in the heating operation, thereby realizing the anti-freezing treatment of the first intermediate heat exchange assembly 41 and / or the second intermediate heat exchange assembly 42.

[0487] As shown in FIGS. 1-9, the control method of the air conditioner according to the second aspect of the present application, the air conditioner comprises a plurality of indoor units and an outdoor unit.

[0488] The outdoor unit comprises a compressor 1, a four-way valve 2, an outdoor heat exchange assembly 3, a first intermediate heat exchange assembly 41 and a second intermediate heat exchange assembly 42 connected by a refrigerant pipeline; wherein the refrigerant pipeline comprises a refrigerant main line 7, a first branch line 71 and a second branch line 72, the first branch line 71 and the second branch line 72 are parallel to each other and both communicate to the refrigerant main line 7, and the first branch line 71 and the second branch line 72 are respectively provided with the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42, and the refrigerant main line 7 is provided with the outdoor heat exchange assembly 3.

[0489] Each indoor unit comprises an indoor heat exchange assembly 9 connected by a water pipeline 91, and the water pipeline 91 of each indoor unit can selectively flow through the first intermediate heat exchange assembly 41 or the second intermediate heat exchange assembly 42.

[0490] The control method comprises:

[0491] Step S1, obtaining the target working mode, indoor load condition and outdoor load condition of each indoor unit;

[0492] Step S2, controlling the working state of the first intermediate heat exchange assembly 41 and the second intermediate heat exchange assembly 42 according to the target working mode, indoor load condition and outdoor load condition of each indoor unit.

[0493] The control method of the air conditioner according to the second aspect of the present application has similar technical effects and principles to the air conditioner according to the first aspect of the present application, and thus will not be described here again.

[0494] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; 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 application.

Claims

1. An air conditioning system, characterized by, The air conditioner system comprises: an outdoor unit comprising 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 a refrigerant pipeline; wherein the refrigerant pipeline comprises a main refrigerant pipeline, a first branch pipeline and a second branch pipeline, the first branch pipeline and the second branch pipeline are parallel to each other and both communicate with the main refrigerant pipeline, the first intermediate heat exchange assembly and the second intermediate heat exchange assembly are respectively arranged on the first branch pipeline and the second branch pipeline, and the outdoor heat exchange assembly is arranged on the main refrigerant pipeline; a plurality of indoor units, each of which comprises 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.

2. The air conditioning system of claim 1, wherein, A first valve is arranged on the first branch pipeline, a second valve is arranged on the second branch pipeline, the refrigerant pipeline further comprises a third branch pipeline, one end of the third branch pipeline is connected to the main refrigerant pipeline between the four-way valve and the outdoor heat exchange assembly, the other end of the third branch pipeline is connected to the second branch pipeline, a third valve is further arranged on the third branch pipeline, and a fourth valve is further arranged on the second branch pipeline between the main refrigerant pipeline and the third branch pipeline. The heat exchange capacity of the first intermediate heat exchange assembly is greater than or equal to that of the second intermediate heat exchange assembly.

3. The air conditioning system of claim 2, wherein, The refrigerant pipeline further comprises a fourth branch pipeline, the fourth branch pipeline is parallel to the first intermediate heat exchange assembly and the second intermediate heat exchange assembly, and a fifth valve is arranged on the fourth branch pipeline.

4. The air conditioning system of any one of claims 1 to 3, wherein, The outdoor heat exchange assembly comprises a first outdoor heat exchange device and a second outdoor heat exchange device, the refrigerant pipeline further comprises a fifth branch pipeline and a sixth branch pipeline which are parallel to each other, both ends of the fifth branch pipeline and the sixth branch pipeline are connected to the main refrigerant pipeline, and the first outdoor heat exchange device and the second outdoor heat exchange device are arranged on the fifth branch pipeline and the sixth branch pipeline respectively.

5. The air conditioning system of claim 4, wherein, The air conditioner system further comprises a first outdoor three-way valve and a second outdoor three-way valve, a first interface of the first outdoor three-way valve is connected to an exhaust port of the compressor through the fifth branch pipeline and the main refrigerant pipeline in sequence, a second interface is connected to the first outdoor heat exchange device through the fifth branch pipeline, and a third interface is connected to a suction port of the compressor through a seventh branch pipeline; a first interface of the second outdoor three-way valve is connected to the exhaust port of the compressor through the sixth branch pipeline and the main refrigerant pipeline in sequence, a second interface is connected to the second outdoor heat exchange device through the sixth branch pipeline, and a third interface is connected to the suction port of the compressor through an eighth branch pipeline.

6. The air conditioner system of claim 2, wherein the heat exchange capacity of the first intermediate heat exchange assembly is greater than or equal to that of the second intermediate heat exchange assembly.

7. The air conditioning system of claim 2, wherein The refrigerant pipeline further comprises a fourth branch pipeline, the fourth branch pipeline is parallel to the first intermediate heat exchange assembly and the second intermediate heat exchange assembly, and a fifth valve is arranged on the fourth branch pipeline.

8. The air conditioning system of claim 2, wherein, The first valve is a first expansion valve, and a shutoff valve or a one-way valve is connected in parallel to both ends of the first valve; the second valve is a second expansion valve, and a shutoff valve or a one-way valve is connected in parallel to both ends of the second valve.

9. The air conditioning system of any one of claims 6 to 8, wherein, The outdoor heat exchange assembly comprises a first outdoor heat exchange device and a second outdoor heat exchange device, the refrigerant pipeline further comprises a fifth branch and a sixth branch which are connected in parallel with each other, and both ends of the fifth branch and the sixth branch are connected to the refrigerant main pipeline, and the first outdoor heat exchange device and the second outdoor heat exchange device are arranged on the fifth branch and the sixth branch respectively.

10. The air conditioning system of claim 9, wherein, The first outdoor three-way valve is further connected to the exhaust port of the compressor through the fifth branch and the refrigerant main pipeline in sequence, the second interface of the first outdoor three-way valve is connected to the first outdoor heat exchange device through the fifth branch, and the third interface of the first outdoor three-way valve is connected to the suction port of the compressor through the seventh branch. The second outdoor three-way valve is further connected to the exhaust port of the compressor through the sixth branch and the refrigerant main pipeline in sequence, the second interface of the second outdoor three-way valve is connected to the second outdoor heat exchange device through the sixth branch, and the third interface of the second outdoor three-way valve is connected to the suction port of the compressor through the eighth branch.

11. The air conditioning system of claim 1, wherein, The detection device is used for detecting indoor load conditions and outdoor load conditions. The control device is connected with the detection device and is used for controlling the working states of the first intermediate heat exchange assembly and the second intermediate heat exchange assembly according to the target working modes of the indoor units, the indoor load conditions and the outdoor load conditions.

12. The air conditioning system according to claim 11, wherein a first valve is arranged on the first branch, a second valve is arranged on the second branch, a third branch is further arranged on the refrigerant pipeline, one end of the third branch is connected to 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, a third valve is further arranged on the third branch, and a fourth valve is further arranged on the second branch between the refrigerant main pipeline and the third branch. The control device comprises a first control module and a second control module, wherein, The first control module is used for controlling the outdoor unit to enter different outdoor working modes according to the target working modes of the indoor units, and the second control module is used for controlling the working states of the first intermediate heat exchange assembly and the second intermediate heat exchange assembly according to the indoor load conditions and the outdoor load conditions in different outdoor working modes.

13. The air conditioning system of claim 12, wherein, The first control module is specifically used for: in the case that the target working modes of all the running indoor units are the refrigeration mode, controlling the outdoor unit to enter the full refrigeration mode, and in the full refrigeration mode, controlling the first valve, the second valve and the fourth valve to be opened and controlling the third valve to be closed.

14. The air conditioning system of claim 13, wherein, The second control module is specifically used for: in the full refrigeration mode, if the total indoor load of all the running indoor units is less than the first outdoor load of the first intermediate heat exchange assembly and less than the second outdoor load of the second intermediate heat exchange assembly, controlling the first intermediate heat exchange assembly or the second intermediate heat exchange assembly to run in the refrigeration mode, and at this time, controlling any one of the first valve and the second valve to be opened. Or, in the full cooling mode, if the total indoor load of all running indoor units is between the first outdoor load and the second outdoor load, control one of the first intermediate heat exchange assembly and the second intermediate heat exchange assembly with a larger outdoor load to run in the cooling mode, and control one of the first valve and the second valve corresponding thereto to open; Or, in the full cooling mode, if the total indoor load of all running indoor units is greater than the first outdoor load of the first intermediate heat exchange assembly and greater than the second outdoor load of the second intermediate heat exchange assembly, control the first intermediate heat exchange assembly and the second intermediate heat exchange assembly to run in the cooling mode at the same time, and control the first valve and the second valve to open at the same time.

15. The air conditioning system of claim 12, wherein, The first control module is specifically configured to: In the case that the target working modes of all running indoor units are the heating mode, control the outdoor unit to enter the full heating mode, and in the full heating mode, control the first valve and / or the second valve and the fourth valve to open, and control the third valve to close.

16. The air conditioning system of claim 15, wherein, The second control module is specifically configured to: In the full heating mode, if the total indoor load of all running indoor units is less than the first outdoor load of the first intermediate heat exchange assembly and less than the second outdoor load of the second intermediate heat exchange assembly, control the first intermediate heat exchange assembly or the second intermediate heat exchange assembly to run in the heating mode, and control any one of the first valve and the second valve to open; Or, in the full heating mode, if the total indoor load of all running indoor units is between the first outdoor load and the second outdoor load, control one of the first intermediate heat exchange assembly and the second intermediate heat exchange assembly with a larger outdoor load to run in the heating mode, and control one of the first valve and the second valve corresponding thereto to open; Or, in the full heating mode, if the total indoor load of all running indoor units is greater than the first outdoor load of the first intermediate heat exchange assembly and greater than the second outdoor load of the second intermediate heat exchange assembly, control the first intermediate heat exchange assembly and the second intermediate heat exchange assembly to run in the heating mode at the same time, and control the first valve and the second valve to open at the same time.

17. The air conditioning system of claim 12, wherein, The first control module is specifically configured to: In the case that the target working modes of all running indoor units simultaneously include the cooling mode and the heating mode, control the outdoor unit to enter the mixed working mode, and in the mixed working mode, control the first valve, the second valve, and the third valve to open, and control the fourth valve to close.

18. The air conditioning system of claim 17, wherein, The first intermediate heat exchange assembly has a heat exchange amount greater than that of the second intermediate heat exchange assembly; and the second control module is specifically configured to: In the mixed working mode, obtain the total indoor cooling load and the total indoor heating load of all running indoor units, and if the total indoor cooling load is greater than the total indoor heating load, control the first intermediate heat exchange assembly to be in the cooling state and the second intermediate heat exchange assembly to be in the heating state; Or, in the mixed working mode, total indoor cooling load and total indoor heating load of all running indoor units are obtained, and if the total indoor cooling load is less than the total indoor heating load, the first intermediate heat exchange component is controlled to be in the heating state and the second intermediate heat exchange component is controlled to be in the cooling state.

19. The air conditioning system of claim 17, wherein, The heat exchange amount of the first intermediate heat exchange component is equal to the heat exchange amount of the second intermediate heat exchange component; and the second control module is specifically configured to: In the mixed working mode, one of the first intermediate heat exchange component and the second intermediate heat exchange component is controlled to be in the cooling state and the other is controlled to be in the heating state.

20. The air conditioning system of claim 3, wherein, The control device is configured to, after receiving a working instruction of entering an anti-freezing mode, obtain an anti-freezing component in the air conditioning system, and control the working state of the outdoor unit according to the anti-freezing component. The anti-freezing component includes the first intermediate heat exchange component and the second intermediate heat exchange component.

21. The air conditioning system of claim 20, wherein, The control device includes a first control module, and the first control module is specifically configured to: In the case that the anti-freezing component is the first intermediate heat exchange component, the first valve, the second valve and the third valve are controlled to be opened and the fourth valve is controlled to be closed, and the first intermediate heat exchange component is controlled to be in the heating operation and the second intermediate heat exchange component is controlled to be in the cooling operation.

22. The air conditioning system of claim 20, wherein, The control module includes a second control module, and the second control module is specifically configured to: In the case that the anti-freezing component is the second intermediate heat exchange component, the first valve, the second valve and the third valve are controlled to be opened and the fourth valve is controlled to be closed, and the first intermediate heat exchange component is controlled to be in the cooling operation and the second intermediate heat exchange component is controlled to be in the heating operation.

23. The air conditioning system of claim 20, wherein, The control module includes a third control module, and the third control module is specifically configured to: In the case that the anti-freezing component is the first intermediate heat exchange component and / or the second intermediate heat exchange component, the first valve and / or the second valve and the fourth valve are controlled to be opened, the third valve and the fifth valve are controlled to be closed, and the first intermediate heat exchange component and / or the second intermediate heat exchange component is controlled to be in the heating operation.

24. The air conditioning system of any one of claims 20-23, wherein, The step of obtaining the anti-freezing component in the air conditioning system specifically includes: Obtaining the temperature of the first intermediate heat exchange component and the second intermediate heat exchange component; In the case that the temperature of the first intermediate heat exchange component is less than a set freezing temperature, the anti-freezing component is determined to be the first intermediate heat exchange component; Or, in the case that the temperature of the second intermediate heat exchange component is less than a set freezing temperature, the anti-freezing component is determined to be the second intermediate heat exchange component; Or, in the case that the temperature of the first intermediate heat exchange component and the second intermediate heat exchange component are both less than a set freezing temperature, the anti-freezing component is determined to be the first intermediate heat exchange component and the second intermediate heat exchange component.

25. A control method of an air conditioning system, characterized by, The air conditioning system includes an outdoor unit and a plurality of indoor units; The outdoor unit comprises 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 comprise a main refrigerant pipeline, a first branch pipeline and a second branch pipeline, the first branch pipeline and the second branch pipeline are parallel to each other and both communicate with the main refrigerant pipeline, the first intermediate heat exchange assembly and the second intermediate heat exchange assembly are arranged on the first branch pipeline and the second branch pipeline respectively, and the outdoor heat exchange assembly is arranged on the main refrigerant pipeline; Each indoor unit comprises 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; The control method comprises: obtaining the target working mode of each indoor unit, the indoor load condition and the outdoor load condition; controlling the working state of the first intermediate heat exchange assembly and the second intermediate heat exchange assembly according to the target working mode of each indoor unit, the indoor load condition and the outdoor load condition; obtaining the target working mode and the indoor load condition of each indoor unit, and obtaining the outdoor load condition of the outdoor unit; controlling the outdoor unit to enter different outdoor working modes according to the target working mode of each indoor unit; under different outdoor working modes, controlling the working state of the first intermediate heat exchange assembly and the second intermediate heat exchange assembly according to the indoor load condition and the outdoor load condition. 26.The control method of the air conditioning system according to claim 25, wherein The step of controlling the outdoor unit to enter different outdoor working modes according to the target working mode of each indoor unit specifically comprises: in the case that the target working mode of each indoor unit in operation is a cooling mode, controlling the outdoor unit to enter a full cooling mode, and in the full cooling mode, controlling the first valve and / or the second valve and the fourth valve to be opened, and controlling the third valve and the fifth valve to be closed; or, in the case that the target working mode of each indoor unit in operation is a heating mode, controlling the outdoor unit to enter a full heating mode, and in the full heating mode, controlling the first valve and / or the second valve and the fourth valve to be opened, and controlling the third valve and the fifth valve to be closed; or, in the case that the target working mode of each indoor unit in operation simultaneously comprises a cooling mode and a heating mode, controlling the outdoor unit to enter a mixed working mode, and in the mixed working mode, controlling the first valve, the second valve and the third valve to be opened, and controlling the fourth valve and the fifth valve to be closed.

27. The control method of the air conditioning system according to claim 26, wherein 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; The step of controlling the working state of the first intermediate heat exchange assembly and the second intermediate heat exchange assembly according to the indoor load condition and the outdoor load condition specifically comprises: In the full cooling mode or the full heating mode, if the total indoor load of all the running indoor units is less than or equal to any one of the first outdoor load of the first intermediate heat exchange assembly and the second outdoor load of the second intermediate heat exchange assembly, the first intermediate heat exchange assembly or the second intermediate heat exchange assembly is controlled to operate, and any one of the first valve and the second valve is controlled to be opened; Or, in the full cooling mode or the full heating mode, if the total indoor load of all the running indoor units is less than the first outdoor load of the first intermediate heat exchange assembly and less than the second outdoor load of the second intermediate heat exchange assembly, the second intermediate heat exchange assembly is controlled to operate, and the first valve is controlled to be closed and the second valve is controlled to be opened; Or, in the full cooling mode or the full heating mode, if the total indoor load of all the running indoor units is greater than the first outdoor load of the first intermediate heat exchange assembly and greater than the second outdoor load of the second intermediate heat exchange assembly, the first intermediate heat exchange assembly and the second intermediate heat exchange assembly are controlled to operate simultaneously, and the first valve and the second valve are controlled to be opened simultaneously; Or, in the full cooling mode or the full heating mode, if the total indoor load of all the indoor units is less than the first outdoor load of the first intermediate heat exchange assembly and greater than the second outdoor load of the second intermediate heat exchange assembly, the first intermediate heat exchange assembly is controlled to operate, and the first valve is controlled to be opened and the second valve is controlled to be closed; Or, in the mixed working mode, the total indoor cooling load and the total indoor heating load of all the running indoor units are obtained, and if the total indoor cooling load is greater than the total indoor heating load, the first intermediate heat exchange assembly is controlled to be in the cooling state and the second intermediate heat exchange assembly is controlled to be in the heating state; Or, in the mixed working mode, the total indoor cooling load and the total indoor heating load of all the running indoor units are obtained, and if the total indoor cooling load is less than the total indoor heating load, the first intermediate heat exchange assembly is controlled to be in the heating state and the second intermediate heat exchange assembly is controlled to be in the cooling state.

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