air conditioning system

Abstract

This utility model relates to the field of air conditioning technology and provides an air conditioning system. The system includes a compressor, an indoor heat exchange unit, a control valve assembly, and multiple outdoor heat exchangers. The control valve assembly is connected to the compressor, the indoor heat exchange unit, and the multiple outdoor heat exchangers respectively. The control valve assembly has a defrost working position. In the defrost working position, the compressor's exhaust port is connected to the indoor heat exchange unit and some of the outdoor heat exchangers through the control valve assembly. The indoor heat exchange unit and some of the outdoor heat exchangers are connected to the remaining outdoor heat exchangers. The remaining outdoor heat exchangers are connected to the compressor's intake port through the control valve assembly. This allows the remaining unfrosted outdoor heat exchangers to continue operating with the indoor heat exchange unit while some outdoor heat exchangers are defrosting, maintaining a normal heating cycle. This ensures that the compressor continues to operate without stopping, effectively avoiding room temperature fluctuations and cold drafts, and significantly improving the system's heating stability and user comfort.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to an air conditioning system. Background Technology

[0002] Air conditioning systems are key equipment for regulating the environment in modern buildings. Their basic working principle utilizes the state changes of refrigerant in a closed-loop system (evaporation absorbing heat and condensation releasing heat) to transfer heat, thereby achieving the purpose of cooling or heating the indoor space. In a typical heat pump air conditioning system, the flow direction of the refrigerant can be changed by switching a four-way valve, allowing for switching between cooling and heating modes depending on the season or demand. When the system operates in heating mode, the refrigerant first evaporates in the outdoor heat exchanger, absorbing heat from the ambient air (at this time, the outdoor unit operates as an evaporator). Then, after being compressed by the compressor, its temperature and pressure increase, and it enters the indoor heat exchanger to condense and release heat, transferring the heat to the indoor air to raise the room temperature (at this time, the indoor unit operates as a condenser). However, in the low-temperature and high-humidity conditions of winter, the surface temperature of the outdoor heat exchanger coils often drops below the air dew point temperature, causing water vapor in the air to condense and freeze on its surface, forming a frost layer. As frost accumulates, it not only increases airflow resistance and clogs fin gaps, but also significantly reduces the heat transfer efficiency of the heat exchanger, leading to a decrease in system heating capacity and energy efficiency ratio. In severe cases, it may even cause the system to fail to operate normally. Therefore, it is necessary to remove the frost in a timely manner to maintain the continuous and efficient operation of the system.

[0003] However, existing defrosting technologies typically require the compressor to stop running or switch to cooling mode to defrost. During this process, the indoor heat exchanger cannot continuously heat, resulting in heating interruption and a drop in indoor temperature, which reduces user comfort. Utility Model Content

[0004] This utility model provides an air conditioning system to solve the defects in the prior art where indoor temperature fluctuations and reduced user comfort are caused by heating interruption during the defrosting process. By maintaining continuous indoor heating during the defrosting process, the indoor temperature is kept stable, thereby improving user comfort.

[0005] This utility model provides an air conditioning system, including:

[0006] compressor;

[0007] Indoor heat exchange unit;

[0008] An outdoor heat exchange unit, wherein the outdoor heat exchange unit includes multiple outdoor heat exchangers;

[0009] A control valve assembly, which is connected to the compressor, the indoor heat exchange unit and the plurality of outdoor heat exchangers respectively;

[0010] The control valve assembly has a defrost working position. In the defrost working position, the compressor's exhaust port is connected to the indoor heat exchange unit and part of the outdoor heat exchanger through the control valve assembly. The indoor heat exchange unit and part of the outdoor heat exchanger are connected to the remaining outdoor heat exchangers. The remaining outdoor heat exchangers are connected to the compressor's intake port through the control valve assembly.

[0011] According to the present invention, an air conditioning system includes a control valve assembly comprising:

[0012] Multiple outdoor control valves, the number of which is the same as the number of outdoor heat exchangers and they correspond one-to-one; the outdoor control valves are respectively connected to the exhaust port of the compressor, the intake port of the compressor and the corresponding outdoor heat exchanger;

[0013] An indoor control valve is connected to the compressor's exhaust port, the compressor's intake port, and the indoor heat exchange unit.

[0014] According to the present invention, an air conditioning system is provided in which the outdoor control valve and / or the indoor control valve are three-way valves.

[0015] According to the present invention, an air conditioning system is provided, wherein the outdoor heat exchange unit further includes a plurality of outdoor throttling valves, the number of which is the same as that of the outdoor heat exchanger and they are connected in a one-to-one correspondence.

[0016] According to the present invention, an air conditioning system is provided in which the outdoor heat exchanger is equipped with a temperature sensor.

[0017] An air conditioning system according to the present invention further includes a controller, which is electrically connected to the temperature sensor and the control valve group.

[0018] According to the present invention, an air conditioning system is provided, wherein there are multiple indoor heat exchange units, and the control valve group has a first working position and / or a second working position;

[0019] In the first working position, the compressor's exhaust port is connected to the outdoor heat exchange unit and part of the indoor heat exchange unit through the control valve group, the outdoor heat exchange unit and part of the indoor heat exchange unit are connected to the remaining indoor heat exchange unit, and the remaining indoor heat exchange unit is connected to the compressor's intake port through the control valve group.

[0020] In the second operating position, the compressor's exhaust port is connected to a portion of the indoor heat exchange units via the control valve assembly. The portion of the indoor heat exchange units is connected to the outdoor heat exchange unit and the remaining indoor heat exchange units, respectively. The outdoor heat exchange unit and the remaining indoor heat exchange units are connected to the compressor's intake port via the control valve assembly.

[0021] According to the present invention, an air conditioning system is provided, wherein the indoor heat exchange unit includes multiple indoor heat exchangers connected in parallel, and each indoor heat exchanger is connected to an indoor electronic expansion valve.

[0022] According to the present invention, an air conditioning system is provided with a water collection device below the outdoor heat exchanger.

[0023] According to the present invention, an air conditioning system is provided in which an oil separator is provided between the control valve group and the exhaust port of the compressor.

[0024] The air conditioning system provided by this utility model, by configuring multiple parallel outdoor heat exchangers and a control valve group with a defrost working position, can enable the remaining unfrosted outdoor heat exchangers to continue to operate in coordination with the indoor heat exchange unit while some outdoor heat exchangers are defrosting, maintaining normal heating cycle and ensuring that the compressor continues to run without stopping. This achieves uninterrupted indoor heating during defrosting, effectively avoids room temperature fluctuations and cold air sensations, and significantly improves the heating stability of the system and the user's comfort. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is one of the schematic diagrams of the air conditioning system provided by this utility model.

[0027] Figure 2 This is the second schematic diagram of the principle structure of the air conditioning system provided by this utility model.

[0028] Figure 3 This is a schematic diagram of the air conditioning system provided by this utility model in cooling mode.

[0029] Figure 4 This is a schematic diagram of the air conditioning system provided by this utility model in heating mode.

[0030] Figure 5This is a schematic diagram of the air conditioning system provided by this utility model, where the second outdoor heat exchanger is defrosting and the indoor unit is heating.

[0031] Figure 6 This is a schematic diagram of the air conditioning system provided by this utility model, in which the first outdoor heat exchanger is defrosting and the indoor unit is heating.

[0032] Figure 7 This is the third schematic diagram of the principle structure of the air conditioning system provided by this utility model.

[0033] Figure 8 This is the fourth schematic diagram of the principle structure of the air conditioning system provided by this utility model.

[0034] Figure 9 This is a schematic diagram of the air conditioning system provided by this utility model in the summer, providing cooling for the entire area.

[0035] Figure 10 This is a schematic diagram of the air conditioning system provided by this utility model, where area A is cooling and area B is heating during the summer.

[0036] Figure 11 This is a schematic diagram of the air conditioning system provided by this utility model, where zone A is heating and zone B is cooling during the summer.

[0037] Figure 12 This is a schematic diagram of the air conditioning system provided by this utility model providing heating throughout the entire area in winter.

[0038] Figure 13 This is a schematic diagram of the air conditioning system provided by this utility model, which is cooling in zone A and heating in zone B during winter.

[0039] Figure 14 This is a schematic diagram of the air conditioning system provided by this utility model, where area A is heating and area B is cooling during winter.

[0040] Figure label:

[0041] 10. Outdoor unit; 20. Indoor unit;

[0042] 100. Compressor;

[0043] 200. Outdoor heat exchange unit; 210. First outdoor heat exchanger; 220. Second outdoor heat exchanger; 231. First outdoor electronic expansion valve; 232. Second outdoor electronic expansion valve; 240. Temperature sensor;

[0044] 300, Indoor heat exchange unit; 301, First indoor heat exchange unit; 302, Second indoor heat exchange unit; 310, Indoor heat exchanger; 320, Indoor electronic expansion valve;

[0045] 400. Control valve assembly; 410. Outdoor control valve; 420. Indoor control valve; 401. First outdoor three-way valve; 402. First indoor three-way valve; 403. Second indoor three-way valve; 404. Second outdoor three-way valve;

[0046] 500, Gas-liquid separator; 600, Liquid pipe shut-off valve; 700, Gas pipe shut-off valve; 800, Oil separator. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0048] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0050] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] The following is combined Figures 1-14 This invention describes the air conditioning system of the present invention.

[0053] An embodiment of this utility model proposes an air conditioning system, such as... Figure 1 and Figure 2 As shown, the air conditioning system includes an outdoor unit 10 and an indoor unit 20. The indoor unit 20 includes an indoor heat exchange unit 300, and the outdoor unit 10 includes a compressor 100, an outdoor heat exchange unit 200, and a control valve assembly 400. The outdoor heat exchange unit 200 includes multiple outdoor heat exchangers, and the control valve assembly 400 is connected to the compressor 100, the indoor heat exchange unit 300, and the multiple outdoor heat exchangers respectively. The multiple outdoor heat exchangers are connected to the indoor heat exchange unit 300.

[0054] The control valve assembly 400 has a defrost working position. In the defrost working position, the exhaust port of the compressor 100 is connected to the indoor heat exchange unit 300 and part of the outdoor heat exchanger through the control valve assembly 400. The indoor heat exchange unit 300 and part of the outdoor heat exchanger are connected to the remaining outdoor heat exchangers. The remaining outdoor heat exchangers are connected to the suction port of the compressor 100 through the control valve assembly 400.

[0055] Understandably, the control valve assembly 400 is connected to the compressor 100, the indoor heat exchange unit 300, and each outdoor heat exchanger, respectively, to regulate the flow and distribution of refrigerant. Multiple outdoor heat exchangers are connected in parallel to the indoor heat exchange unit 300, forming a complete refrigerant circulation path. The control valve assembly 400 has a defrost operating position, used to defrost the outdoor heat exchangers through heating.

[0056] Specifically, when the system enters defrost mode, the air conditioning system operates in heating mode, and the control valve assembly 400 is in the defrost working position. At this time, the discharge port of the compressor 100 delivers high-temperature and high-pressure refrigerant to one or more of the outdoor heat exchangers and indoor heat exchange units 300 through the control valve assembly 400. The refrigerant exchanges heat in some of the outdoor heat exchangers and indoor heat exchange units 300, so that while the indoor heat exchange units 300 are heating, some of the outdoor heat exchangers are being defrosted. The refrigerant after exchanging heat from some of the outdoor heat exchangers and indoor heat exchange units 300 merges and continues to flow into the remaining outdoor heat exchangers, and finally returns to the suction port of the compressor 100 through the control valve assembly 400, completing the entire heating cycle. In this way, when the air conditioning system is operating in heating mode, it can achieve heating and defrosting of some of the outdoor heat exchangers while the indoor heat exchange units 300 are heating. Therefore, defrosting of some outdoor heat exchangers can be achieved without interrupting indoor heating during the defrosting process, ensuring stable indoor temperature and thus improving user comfort.

[0057] The air conditioning system provided in this embodiment of the utility model, by configuring multiple parallel outdoor heat exchangers and a control valve group 400 with a defrost working position, can enable the remaining unfrosted outdoor heat exchangers to continue to operate in coordination with the indoor heat exchange unit 300 while some outdoor heat exchangers are defrosting, maintaining a normal heating cycle and ensuring that the compressor 100 continues to operate without stopping. This achieves uninterrupted indoor heating during the defrosting process, effectively avoids room temperature fluctuations and cold air sensations, and significantly improves the heating stability of the system and the user's comfort.

[0058] It should be noted that existing defrosting processes typically require starting and stopping the compressor 100 and the outdoor fan. This frequent start-stop operation not only causes the compressor 100 to generate a large instantaneous current each time it starts, significantly increasing system energy consumption, but also causes repeated mechanical and electrical shocks to the compressor 100 motor, fan motor, and electrical control components. Over long-term operation, this can easily lead to component fatigue, accelerated wear, and even failure, shortening the equipment's lifespan. In contrast, this embodiment does not require shutdown during defrosting; the compressor 100 and fan can maintain continuous and stable operation. This effectively avoids the additional energy consumption and stress damage caused by frequent start-stop operations, helping to reduce overall operating power consumption, improve energy efficiency, and enhance the system's operational reliability and durability.

[0059] In one embodiment of this utility model, the control valve assembly 400 further includes a heating operating position; such as Figure 1 and Figure 4 As shown, when the control valve assembly 400 is in the heating operation position, the discharge port of the compressor 100 delivers high-temperature, high-pressure refrigerant to the indoor heat exchange unit 300 through the control valve assembly 400. The refrigerant undergoes heat exchange in the indoor heat exchange unit 300 to heat the indoor area corresponding to the indoor heat exchange unit 300. After heat exchange in the indoor heat exchange unit 300, the refrigerant enters multiple outdoor heat exchangers. After heat exchange in multiple parallel outdoor heat exchangers, it finally returns to the suction port of the compressor 100 through the control valve assembly 400, forming a complete refrigerant circulation path. Thus, when the control valve assembly 400 is in the heating operation position, the refrigerant passage forms a complete heating cycle, and the system operates in normal heating mode.

[0060] In one embodiment of this utility model, such as Figure 1 and Figure 3 As shown, the control valve assembly 400 also includes a cooling operation position. In the cooling operation position, the discharge port of the compressor 100 delivers all the high-temperature and high-pressure refrigerant to multiple parallel outdoor heat exchangers through the control valve assembly 400. After heat exchange in the multiple parallel outdoor heat exchangers, the refrigerant converges and enters the indoor heat exchange unit 300 to cool the indoor area corresponding to the indoor heat exchange unit 300. After heat exchange in the indoor heat exchange unit 300, the refrigerant returns to the suction port of the compressor 100 through the control valve assembly 400, forming a complete refrigerant circulation loop. Thus, the control valve assembly 400 also includes a cooling operation position, the refrigerant passage forms a complete refrigeration cycle, and the system operates in normal cooling mode.

[0061] It should be noted that by controlling the control valve group 400 in different working positions, the flow direction and distribution method of the refrigerant are adjusted so that some outdoor heat exchangers can perform heating and defrosting, while the remaining outdoor heat exchangers continue to work in coordination with the indoor heat exchange unit 300 to maintain normal heating cycle and ensure that the compressor 100 continues to run without stopping.

[0062] In one embodiment of the present invention, the outdoor heat exchange unit 200 further includes a plurality of outdoor throttling valves, the number of which is the same as that of the outdoor heat exchangers and they are connected in a one-to-one correspondence.

[0063] Understandably, the outdoor heat exchange unit 200 also includes multiple outdoor throttling valves. The number of outdoor throttling valves is equal to the number of outdoor heat exchangers, and each outdoor throttling valve is connected to a corresponding outdoor heat exchanger. They are usually installed on the refrigerant liquid pipe or gas pipe leading to the outdoor heat exchanger. By independently controlling the opening of each outdoor throttling valve, the refrigerant flow rate and pressure entering the corresponding outdoor heat exchanger can be adjusted, thereby achieving independent control of the operating status of each heat exchanger.

[0064] In this embodiment, the outdoor throttle valve is an electronic expansion valve.

[0065] In one embodiment of this utility model, the outdoor heat exchanger is equipped with a temperature sensor 240.

[0066] Understandably, each outdoor heat exchanger is equipped with a temperature sensor 240 to monitor the surface temperature or fin temperature of the corresponding outdoor heat exchanger in real time. By collecting the temperature data of each outdoor heat exchanger, the frosting status of each outdoor heat exchanger can be determined. For example, when the surface temperature of a certain outdoor heat exchanger is continuously lower than a set threshold (such as 0°C), and the risk of frosting is confirmed in combination with environmental temperature and humidity conditions, the outdoor heat exchanger will be defrosted.

[0067] In this embodiment, the temperature sensor 240 is located at the lowest temperature position of the outdoor heat exchanger.

[0068] In one embodiment of this utility model, such as Figure 1 As shown, the control valve group 400 includes an indoor control valve 420 and multiple outdoor control valves 410. The number of outdoor control valves 410 is the same as the number of outdoor heat exchangers. Each outdoor control valve 410 is connected to a corresponding outdoor heat exchanger, thereby enabling independent control of each outdoor heat exchanger.

[0069] Specifically, the outdoor control valve 410 is connected to the exhaust port of the compressor 100, the suction port of the compressor 100 and the corresponding outdoor heat exchanger, respectively; the indoor control valve 420 is connected to the exhaust port of the compressor 100, the suction port of the compressor 100 and the indoor heat exchange unit 300, respectively.

[0070] Understandably, each outdoor control valve 410 is connected to the exhaust port of the compressor 100, the suction port of the compressor 100, and its corresponding outdoor heat exchanger, respectively, and can selectively switch the outdoor heat exchanger to heating or defrosting mode according to the system's operating requirements. At the same time, the indoor control valve 420 is connected between the exhaust port and suction port of the compressor 100 and the indoor heat exchange unit 300, and is used to control the flow of refrigerant in the indoor heat exchange unit 300. Through the coordinated action of the indoor control valve 420 and multiple outdoor control valves 410, the system can flexibly adjust the refrigerant path under different operating conditions such as normal heating, partial defrosting, or full-load operation, realize the functional switching and combined operation between the heat exchangers, and thus support independent defrosting of some outdoor heat exchangers without shutting down the system, ensuring the continuity of indoor heating and the stability of system operation.

[0071] Optionally, the outdoor control valve 410 can be a solenoid valve; of course, the indoor control valve 420 can also be a solenoid valve.

[0072] It is understandable that solenoid valves have advantages such as fast response speed, high control precision, good reliability and easy to realize automatic control. They can quickly switch the opening and closing state of the valve body or change the flow direction of refrigerant according to the electrical signal sent by the system, thereby accurately controlling the flow direction and flow rate of refrigerant between the compressor 100, the outdoor heat exchange unit 200 and each indoor heat exchange unit 300.

[0073] In one embodiment of this utility model, a controller is also included, which is electrically connected to the temperature sensor 240 and the control valve group 400.

[0074] Understandably, the controller is electrically connected to the temperature sensors 240 and control valve group 400 installed on each outdoor heat exchanger to achieve signal acquisition and execution control. Specifically, the controller receives the surface temperature data of the heat exchangers monitored by each temperature sensor 240 in real time, and identifies the outdoor heat exchangers that need defrosting according to the preset frosting judgment logic; then, the controller outputs control signals to adjust the opening and closing states of the corresponding outdoor control valve 410 and indoor control valve 420 of the control valve group 400, switching the system to the corresponding defrosting working position to defrost the outdoor heat exchangers that need defrosting.

[0075] In one specific embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the air conditioning system includes a compressor 100, an indoor heat exchange unit 300, an outdoor heat exchange unit 200, and a control valve group 400; the outdoor heat exchange unit 200 includes multiple outdoor heat exchangers; the control valve group 400 includes multiple outdoor control valves 410 and indoor control valves 420.

[0076] There are two outdoor heat exchangers, namely the first outdoor heat exchanger 210 and the second outdoor heat exchanger 220; both the outdoor control valve 410 and the indoor control valve 420 are three-way valves. There are two outdoor control valves 410, namely the first outdoor three-way valve 401 connected to the first outdoor heat exchanger 210 and the second outdoor three-way valve 404 connected to the second outdoor heat exchanger 220; there is one indoor control valve 420, which is referred to as the first indoor three-way valve 402.

[0077] The first port of the first outdoor three-way valve 401 is connected to the exhaust port of the compressor 100, the second port of the first outdoor three-way valve 401 is connected to the suction port of the compressor 100, the third port of the first outdoor three-way valve 401 is connected to the first end of the first outdoor heat exchanger 210, and the second end of the first outdoor heat exchanger 210 is connected to the first outdoor electronic expansion valve 231.

[0078] The first port of the second outdoor three-way valve 404 is connected to the exhaust port of the compressor 100, the second port of the second outdoor three-way valve 404 is connected to the suction port of the compressor 100, the third port of the second outdoor three-way valve 404 is connected to the first end of the second outdoor heat exchanger 220, and the second end of the second outdoor heat exchanger 220 is connected to the second outdoor electronic expansion valve 232.

[0079] The first port of the first indoor three-way valve 402 is connected to the exhaust port of the compressor 100, the second port of the first indoor three-way valve 402 is connected to the intake port of the compressor 100, the third port of the first indoor three-way valve 402 is connected to the first end of the indoor heat exchange unit 300, and the second end of the indoor heat exchange unit 300 is connected to the first outdoor electronic expansion valve 231 and the second outdoor electronic expansion valve 232.

[0080] In this embodiment, the control valve assembly 400 has a defrost working position, a heating working position, and a cooling working position. It should be noted that when the control valve assembly 400 is in the defrost working position, either the first outdoor heat exchanger 210 or the second outdoor heat exchanger 220 can be defrosted. Therefore, the defrost working position of the control valve assembly 400 can include two types: a first defrost working position and a second defrost working position, corresponding to the defrosting of the first outdoor heat exchanger 210 and the second outdoor heat exchanger, respectively.

[0081] The operating modes of the air conditioning system in this embodiment include:

[0082] First type: Normal cooling mode

[0083] like Figure 3 As shown, the first outdoor electronic expansion valve 231 and the second outdoor electronic expansion valve 232 on the outdoor side are fully open, and the flow is throttled through the indoor electronic expansion valve 320 on the indoor side.

[0084] When the control valve group 400 is in the refrigeration working position, the refrigerant is discharged from the compressor 100 cavity and enters the two outdoor heat exchangers for condensation through the first outdoor three-way valve 401 and the second outdoor three-way valve 404 respectively; then it merges and enters the indoor heat exchanger 310 after being throttled by the electronic expansion valve of the indoor heat exchange unit 300, and finally returns to the compressor 100 through the first indoor three-way valve 402.

[0085] The second type is the normal heating mode.

[0086] like Figure 4 As shown, the indoor electronic expansion valve 320 of the indoor heat exchange unit 300 is fully open, and throttling is achieved through the first outdoor electronic expansion valve 231 and the second outdoor electronic expansion valve 232 on the outdoor side.

[0087] When the control valve assembly 400 is in the heating position, the refrigerant is discharged from the compressor 100 cavity and enters the indoor heat exchanger 310 for condensation through the first indoor three-way valve 402; then, after being throttled by the first outdoor electronic expansion valve 231 and the second outdoor electronic expansion valve 232, it enters the first outdoor heat exchanger 210 and the second outdoor heat exchanger 220 respectively; the refrigerant after heat exchange in the first outdoor heat exchanger 210 and the second outdoor heat exchanger 220 is merged through the first outdoor three-way valve 401 and the second outdoor three-way valve 404 respectively, and finally returns to the compressor 100.

[0088] The third option is heating mode + defrosting of the first outdoor heat exchanger (210).

[0089] like Figure 5 As shown, the indoor electronic expansion valve 320 of the indoor heat exchange unit 300 is fully open, the first outdoor electronic expansion valve 231 on the outdoor side is fully open, and throttling is performed through the second outdoor electronic expansion valve 232.

[0090] When the control valve assembly 400 is in the first defrost working position, the refrigerant is discharged from the compressor 100 cavity and split into two paths. The first path enters the first outdoor heat exchanger 210 through the first outdoor three-way valve 401 (to defrost the first outdoor heat exchanger 210), and the second path enters the indoor heat exchanger 310 through the first indoor three-way valve 402 to achieve the purpose of heating. Then the two paths are merged, and after being throttled by the second outdoor electronic expansion valve 232, they enter the second indoor heat exchanger 310, and finally return to the compressor 100 through the second outdoor three-way valve 404.

[0091] The fourth type is heating mode + defrosting of the second outdoor heat exchanger.

[0092] like Figure 6 As shown, the indoor electronic expansion valve 320 of the indoor heat exchange unit 300 is fully open, and the second outdoor electronic expansion valve 232 on the outdoor side is fully open, and throttling is performed through the first outdoor electronic expansion valve 231.

[0093] When the control valve assembly 400 is in the second defrost working position, the refrigerant is discharged from the compressor 100 cavity and split into two paths. The first path enters the second outdoor heat exchanger 220 through the second outdoor three-way valve 404 (to defrost the second outdoor heat exchanger 220), and the second path enters the indoor heat exchanger 310 through the first indoor three-way valve 402 to achieve the purpose of heating. Then the two paths are merged, and after being throttled by the first outdoor electronic expansion valve 231, they enter the first outdoor heat exchanger 210, and finally return to the compressor 100 through the first outdoor three-way valve 401.

[0094] It should be noted that the outdoor heat exchange unit 200 includes multiple outdoor heat exchangers. This structural design is equivalent to dividing the traditional integral outdoor heat exchange area into multiple independent and individually controllable heat exchange zones. Each outdoor heat exchanger acts as an independent heat exchange module. During system heating operation, it can function as a condenser to release heat, and when defrosting is required, it can switch to an evaporator to absorb heat and melt the frost layer.

[0095] In one embodiment of the present invention, the indoor heat exchange unit 300 includes a plurality of indoor heat exchangers 310 connected in parallel, and the indoor heat exchangers 310 are connected to an indoor electronic expansion valve 320.

[0096] Understandably, each indoor heat exchange unit 300 includes multiple indoor heat exchangers 310 connected in parallel. These multiple indoor heat exchangers 310 can be operated simultaneously or selectively according to load demand to improve the precision of temperature regulation and system responsiveness. Furthermore, each indoor heat exchanger 310 is connected to an indoor electronic expansion valve 320 on its refrigerant line for precise control of the refrigerant flow and pressure entering each indoor heat exchanger 310, achieving efficient regulation of the evaporation process.

[0097] It should be noted that the indoor electronic expansion valve 320 can adjust its opening in real time according to changes in indoor heat load, and in conjunction with the working position switching of the control valve group 400, further optimize the operating efficiency, temperature control accuracy and energy-saving performance of the entire system.

[0098] In one embodiment of this utility model, multiple indoor heat exchange units 300 are arranged in parallel, and the control valve group 400 also has a first working position and / or a second working position.

[0099] In the first working position, the exhaust port of the compressor 100 is connected to the outdoor heat exchange unit 200 and part of the indoor heat exchange unit 300 through the control valve assembly 400. The outdoor heat exchange unit 200 and part of the indoor heat exchange unit 300 are combined and then connected to the remaining indoor heat exchange unit 300. The remaining indoor heat exchange unit 300 is connected to the suction port of the compressor 100 through the control valve assembly 400.

[0100] In the second operating position, the discharge port of the compressor 100 is connected to a portion of the indoor heat exchange units 300 through the control valve assembly 400. The portion of the indoor heat exchange units 300 is connected to the outdoor heat exchange unit 200 and the remaining indoor heat exchange units 300 respectively. The outdoor heat exchange unit 200 and the remaining indoor heat exchange units 300 are connected to the suction port of the compressor 100 through the control valve assembly 400.

[0101] It is understandable that the control valve assembly 400 is connected to the compressor 100, the outdoor heat exchange unit 200 and each indoor heat exchange unit 300 respectively, and is used to regulate the flow of refrigerant; the control valve assembly 400 has two working positions to realize different operating modes of multiple indoor heat exchange units 300.

[0102] Specifically, the air conditioning system operates in cooling mode, with the control valve assembly 400 in its first working position. At this time, the compressor 100's discharge port delivers high-temperature, high-pressure refrigerant to the outdoor heat exchange unit 200 and part of the indoor heat exchange units 300 via the control valve assembly 400. The refrigerant exchanges heat in the outdoor heat exchange unit 200 and part of the indoor heat exchange units 300 to heat the corresponding indoor area. The refrigerant after heat exchange in the outdoor heat exchange unit 200 merges with the refrigerant after heat exchange in part of the indoor heat exchange units 300 and continues to flow into the remaining indoor heat exchange units 300 for further heat exchange, cooling the corresponding indoor area. Finally, the refrigerant after heat exchange in the remaining indoor heat exchange units 300 flows back to the compressor 100's suction port via the control valve assembly 400, completing the entire refrigeration cycle. Thus, when the system operates in cooling mode, it can achieve the function of heating in some indoor heat exchange units 300 while cooling in the remaining indoor heat exchange units 300.

[0103] The air conditioning system operates in heating mode, with control valve assembly 400 in its second working position. At this time, the compressor 100's discharge port delivers high-temperature, high-pressure refrigerant to a portion of the indoor heat exchange units 300 via control valve assembly 400, thereby heating the indoor areas corresponding to those units. The refrigerant, after heat exchange in the indoor heat exchange units 300, then flows to the outdoor heat exchange unit 200 and the remaining indoor heat exchange units 300, where it exchanges heat again, thus cooling the indoor areas corresponding to the remaining units. Finally, the refrigerant after heat exchange between the outdoor heat exchange unit 200 and the remaining indoor heat exchange units 300 merges and then returns to the suction port of the compressor 100 through the control valve group 400, completing the entire heating cycle. In this way, when the air conditioning system is operating in heating mode, some indoor heat exchange units 300 can heat while the remaining indoor heat exchange units 300 cool. This allows for zoned temperature control of multiple indoor heat exchange units 300 within the same operating cycle, enabling some indoor areas to heat while others cool, thus meeting the combined cooling and heating needs of multiple indoor areas simultaneously.

[0104] The air conditioning system provided in this embodiment of the utility model, by setting a control valve group 400 between the compressor 100, the outdoor heat exchange unit 200, and multiple indoor heat exchange units 300, and the control valve group 400 having two switchable working positions, enables the system to achieve zoned temperature control of multiple indoor heat exchange units 300 within the same operating cycle. That is, some indoor heat exchange units 300 correspond to areas that are heated, while other indoor heat exchange units 300 correspond to areas that are cooled, thereby meeting the complex usage scenarios of different indoor areas with heating and cooling needs, effectively improving the system's operational flexibility and adaptability to complex environments, and enhancing user comfort.

[0105] In one embodiment of this utility model, such as Figure 8 and Figure 9 As shown, the control valve assembly 400 has a third working position. In the third working position, the exhaust port of the compressor 100 is connected to the outdoor heat exchange unit 200 through the control valve assembly 400. The outdoor heat exchange unit 200 is connected to multiple indoor heat exchange units 300 respectively. The multiple indoor heat exchange units 300 are connected to the suction port of the compressor 100 through the control valve assembly 400.

[0106] Understandably, the control valve assembly 400 also has a third operating position. When the air conditioning system is operating in cooling mode, and the control valve assembly 400 switches to the third operating position, the discharge port of the compressor 100 delivers all the high-temperature, high-pressure refrigerant to the outdoor heat exchange unit 200 through the control valve assembly 400. The refrigerant undergoes heat exchange in the outdoor heat exchange unit 200, and the refrigerant after heat exchange in the outdoor heat exchange unit 200 is distributed to multiple indoor heat exchange units 300. Each indoor heat exchange unit 300 independently performs cooling to achieve cooling of the indoor areas corresponding to all indoor heat exchange units 300. Finally, the refrigerant after heat exchange in each indoor heat exchange unit 300 returns to the suction port of the compressor 100 through the control valve assembly 400, forming a complete refrigerant circulation loop. Thus, when the system is operating in cooling mode, the third operating position of the control valve assembly 400 is used to enable multiple indoor heat exchange units 300 to perform cooling simultaneously, thereby achieving unified temperature control of the entire indoor space.

[0107] In one embodiment of this utility model, such as Figure 8 and Figure 12 As shown, the control valve assembly 400 has a fourth working position. In the fourth working position, the exhaust port of the compressor 100 is connected to multiple indoor heat exchange units 300 through the control valve assembly 400. The multiple indoor heat exchange units 300 are connected to the outdoor heat exchange unit 200 after being combined. The outdoor heat exchange unit 200 is connected to the intake port of the compressor 100 through the control valve assembly 400.

[0108] Understandably, the control valve assembly 400 also has a fourth operating position. When the air conditioning system is operating in heating mode, and the control valve assembly 400 switches to the fourth operating position, the discharge port of the compressor 100 delivers high-temperature, high-pressure refrigerant to multiple indoor heat exchange units 300 through the control valve assembly 400. The refrigerant exchanges heat in each indoor heat exchange unit 300, and each indoor heat exchange unit 300 independently heats, thereby achieving heating for the indoor areas corresponding to all indoor heat exchange units 300. After heat exchange in each indoor heat exchange unit 300, the refrigerant converges at the outdoor heat exchange unit 200, exchanges heat through the outdoor heat exchange unit 200, and finally returns to the suction port of the compressor 100 through the control valve assembly 400, forming a complete refrigerant circulation path. Thus, when the system is operating in heating mode, the fourth operating position of the control valve assembly 400 is used to enable multiple indoor heat exchange units 300 to heat simultaneously, further enhancing the system's adaptability and control flexibility in different application scenarios.

[0109] It should be noted that by controlling the control valve group 400 in different working positions, the flow direction and distribution method of the refrigerant can be adjusted to adapt to the temperature control needs of multiple zones, realize the operation strategy of heating some indoor areas and cooling other areas, or uniformly cooling or heating all indoor areas, thereby improving the system's flexibility and energy efficiency under complex operating conditions.

[0110] In one embodiment of this utility model, such as Figure 7 As shown, the control valve group 400 includes an outdoor control valve 410 and multiple indoor control valves 420; wherein the number of indoor control valves 420 is the same as the number of indoor heat exchange units 300, and they are connected one-to-one to achieve independent control of each indoor heat exchange unit 300.

[0111] Specifically, the outdoor control valve 410 is connected to the exhaust port of the compressor 100, the suction port of the compressor 100, and the outdoor heat exchange unit 200, respectively; the indoor control valve 420 is connected to the exhaust port of the compressor 100, the suction port of the compressor 100, and the corresponding indoor heat exchange unit 300, respectively.

[0112] Understandably, the outdoor control valve 410 is connected to the discharge port and suction port of the compressor 100, as well as the outdoor heat exchange unit 200, to regulate the refrigerant flow path between the compressor 100 and the outdoor heat exchange unit 200. The indoor control valve 420 is connected to the discharge port and suction port of the compressor 100, as well as the corresponding indoor heat exchange unit 300, to independently control the refrigerant flow into or out of the corresponding indoor heat exchange unit 300 according to system operating requirements; all indoor heat exchange units 300 are interconnected with the outdoor heat exchange unit 200, together forming a complete refrigerant circulation loop.

[0113] It should be noted that, through the coordinated operation of the outdoor control valve 410 and multiple indoor control valves 420, the system can switch between multiple operating modes in different working positions, meet the needs of multiple indoor areas to cool and heat simultaneously or independently, and improve the system's operational flexibility.

[0114] In one specific embodiment of this utility model, such as Figure 7 and Figure 8 As shown, the air conditioning system includes a compressor 100, an outdoor heat exchange unit 200, multiple indoor heat exchange units 300, and a control valve group 400. The control valve group 400 includes an outdoor control valve 410 and multiple indoor control valves 420. The outdoor heat exchange unit 200 includes an outdoor heat exchanger, referred to as the first outdoor heat exchanger. The outdoor control valve 410 includes a first outdoor three-way valve 401 connected to the first outdoor heat exchanger. There are two indoor heat exchange units 300, namely the first indoor heat exchange unit 301 and the second indoor heat exchange unit 302. The indoor area corresponding to the first indoor heat exchange unit 301 is referred to as area A, and the indoor area corresponding to the second indoor heat exchange unit 302 is referred to as area B. Correspondingly, there are two indoor control valves 420. The indoor control valves 420 are three-way valves, so the two indoor control valves 420 are the first indoor three-way valve 402 and the second indoor three-way valve 403.

[0115] The first port of the first outdoor three-way valve 401 is connected to the exhaust port of the compressor 100, the second port of the first outdoor three-way valve 401 is connected to the suction port of the compressor 100, and the third port of the first outdoor three-way valve 401 is connected to the first outdoor heat exchanger.

[0116] The first port of the first indoor three-way valve 402 is connected to the exhaust port of the compressor 100, the second port of the first indoor three-way valve 402 is connected to the intake port of the compressor 100, and the third port of the first indoor three-way valve 402 is connected to the first indoor heat exchange unit 301.

[0117] The first port of the second indoor three-way valve 403 is connected to the exhaust port of the compressor 100, the second port of the second indoor three-way valve 403 is connected to the suction port of the compressor 100, and the third port of the second indoor three-way valve 403 is connected to the second indoor heat exchange unit 302.

[0118] In this embodiment, the control valve assembly 400 has a first working position, a second working position, a third working position, and a fourth working position; wherein, when the system is running in cooling mode, the control valve assembly 400 can operate in the first working position and the third working position; when the system is running in heating mode, the control valve assembly 400 can operate in the second working position and the fourth working position.

[0119] It should be noted that when the control valve assembly 400 is in the first operating position, the first indoor heat exchange unit 301 can heat while the second indoor heat exchange unit 302 cools, i.e., heating in zone A + cooling in zone B; or the first indoor heat exchange unit 301 can cool while the second indoor heat exchange unit 302 heats, i.e., cooling in zone A + heating in zone B. Therefore, the first operating position of the control valve assembly 400 can include two modes, namely, first operating position I and first operating position II. It should also be noted that the second operating position of the control valve assembly 400 can also include two modes, namely, second operating position I and second operating position II.

[0120] The operating modes of the air conditioning system in this embodiment include:

[0121] First type: Summer all-area cooling mode

[0122] like Figure 9 As shown, the control valve group 400 is in the third working position. The refrigerant is fed from the compressor 100 through the first outdoor three-way valve 401 and the first outdoor heat exchanger, and then enters the first indoor heat exchange unit 301 and the second indoor heat exchange unit 302 respectively. After heat exchange in the first indoor heat exchange unit 301 and the second indoor heat exchange unit 302, the refrigerant flows through the first indoor three-way valve 402 and the second indoor three-way valve 403 to the compressor 100, realizing refrigerant circulation. Thus, region A and region B are connected in parallel to achieve full-region cooling mode operation.

[0123] The second type is the summer cooling mode for Zone A and heating mode for Zone B.

[0124] like Figure 10 As shown, the control valve group 400 is in the first working position I. The refrigerant enters the first outdoor three-way valve 401 and the second indoor three-way valve 403 from the compressor 100. It passes through the first outdoor three-way valve 401 and the first outdoor heat exchanger to form the first flow path. It passes through the second indoor three-way valve 403 and the second indoor heat exchange unit 302 to form the third flow path (for heating zone B). After heat exchange, the refrigerant flows from the first flow path and the third flow path to the first indoor heat exchange unit 301 (for cooling zone A). After heat exchange in the first indoor heat exchange unit 301, the refrigerant returns to the compressor 100 through the first indoor three-way valve 402, realizing refrigerant circulation, thereby achieving cooling in zone A and heating in zone B at the same time.

[0125] The third type is the summer zone A heating + zone B cooling mode.

[0126] like Figure 11As shown, the control valve group 400 is in the first working position II. The refrigerant enters the first outdoor three-way valve 401 and the first indoor three-way valve 402 from the compressor 100. It passes through the first outdoor three-way valve 401 and the first outdoor heat exchanger to form the first flow path. It passes through the first indoor three-way valve 402 and the first indoor heat exchange unit 301 to form the second flow path (for heating zone A). After heat exchange, the refrigerant flows from the first flow path and the second flow path to the second indoor heat exchange unit 302 (for cooling zone B). After heat exchange in the second indoor heat exchange unit 302, the refrigerant returns to the compressor 100 through the second indoor three-way valve 403, realizing refrigerant circulation, thereby achieving heating in zone A and cooling in zone B.

[0127] The fourth type is the winter all-area heating mode.

[0128] like Figure 12 As shown, the control valve group 400 is in the fourth working position. The refrigerant enters the first indoor three-way valve 402 and the second indoor three-way valve 403 from the compressor 100. After passing through the first indoor three-way valve 402, it exchanges heat through the first indoor heat exchange unit 301 to form the second flow path (for heating zone A). After passing through the second indoor three-way valve 403, it exchanges heat through the second indoor heat exchange unit 302 to form the third flow path (for heating zone B). After heat exchange, the refrigerant flows from the second flow path and the third flow path to the first outdoor heat exchanger, and then returns to the compressor 100 through the first outdoor three-way valve 401, completing the refrigerant cycle. Thus, zone A and zone B are connected in parallel to achieve full-zone heating mode operation.

[0129] Fifth type: Winter zone A cooling + zone B heating mode

[0130] like Figure 13 As shown, when the control valve group 400 is in the second working position I, the refrigerant enters the second indoor three-way valve 403 from the compressor 100 and exchanges heat with the second indoor heat exchange unit 302 (to heat area B). After heat exchange, the refrigerant is divided into two paths, which enter the first outdoor heat exchanger and the first indoor heat exchange unit 301 (to cool area A) respectively. The two refrigerants flow through the first outdoor three-way valve 401 and the first indoor three-way valve 402 respectively and then merge into the compressor 100 to complete the refrigerant cycle, thereby realizing the cooling of area A and the heating of area B at the same time.

[0131] The sixth type is the winter heating mode in Zone A combined with the cooling mode in Zone B.

[0132] like Figure 14As shown, the control valve group 400 is in the second working position II. The refrigerant enters the first indoor three-way valve 402 from the compressor 100 and exchanges heat with the first indoor heat exchange unit 301 (for heating zone A). After heat exchange, the refrigerant is divided into two paths, which enter the first outdoor heat exchanger and the second indoor heat exchange unit 302 (for cooling zone B) respectively. The two refrigerants flow into the compressor 100 after passing through the first outdoor three-way valve 401 and the second indoor three-way valve 403 respectively, thus completing the refrigerant cycle and realizing heating in zone A and cooling in zone B at the same time.

[0133] Understandably, by switching the three three-way valves (first outdoor three-way valve 401, first indoor three-way valve 402, and second indoor three-way valve 403) to adjust the refrigerant flow, six working modes can be achieved: summer full-zone cooling, summer zone A cooling + zone B heating, summer zone A heating + zone B cooling, winter full-zone heating, winter zone A cooling + zone B heating, and winter zone A heating + zone B cooling.

[0134] It should be noted that the control valve group 400 being in the third working position, the first working position I, and the first working position II correspond to three different working modes of the system during summer operation. These three modes are all specific operating conditions under the system's cooling mode. That is, the first, second, and third working modes mentioned above are the three working modes of the system during summer.

[0135] The control valve assembly 400 being in the fourth working position, the second working position I, and the second working position II correspond to three different working modes of the system during winter operation. These three modes are all specific operating conditions under the system's heating mode. That is, the fourth, fifth, and sixth working modes mentioned above are the three working modes of the system during winter.

[0136] In one embodiment of this utility model, such as Figure 7 As shown, a gas-liquid separator 500 is provided between the control valve group 400 and the suction port of the compressor 100.

[0137] In one embodiment of this utility model, a liquid pipe shut-off valve 600 is connected to the side of the outdoor heat exchange unit 200 away from the control valve group 400.

[0138] Understandably, the liquid line shut-off valve 600 is connected to the liquid line side of the outdoor heat exchange unit 200 to control the flow of refrigerant between the outdoor heat exchanger and the indoor heat exchanger 310. During system installation, maintenance, or long-term shutdown, the liquid line shut-off valve 600 can be closed to isolate the refrigerant, prevent leakage, and facilitate maintenance. During normal system operation, the liquid line shut-off valve 600 is in the open position to ensure smooth refrigerant flow, thereby enhancing the system's safety and reliability.

[0139] In one embodiment of this utility model, a gas pipe shut-off valve 700 is provided between the control valve group 400 and the indoor heat exchange unit 300.

[0140] It is understandable that a gas pipe shut-off valve 700 is installed on the gas pipe between the control valve assembly 400 and each indoor heat exchange unit 300. The gas pipe shut-off valve 700 is located on the gas phase flow path of the refrigerant and is used to control the on / off of the gaseous refrigerant flowing back from the indoor heat exchange unit 300 to the control valve assembly 400, so as to improve the safety of the system.

[0141] In one embodiment of this utility model, a water collection device is provided below the outdoor heat exchanger. The water collection device is used to collect the defrost water melted during the defrosting process or the condensate generated during operation of the outdoor heat exchanger.

[0142] In one embodiment of this utility model, an oil separator 800 is provided between the control valve group 400 and the exhaust port of the compressor 100. The oil separator 800 is used to separate the lubricating oil discharged from the compressor 100 along with the high-temperature and high-pressure refrigerant gas, preventing excessive refrigerant oil from accumulating in the outdoor heat exchanger and indoor heat exchanger 310 and affecting the heat exchange efficiency. The oil separator 800 separates most of the lubricating oil from the gaseous refrigerant through its internal filtration or centrifugal structure, and sends the separated lubricating oil back to the crankcase of the compressor 100 through the oil return pipeline, thereby ensuring that the compressor 100 receives continuous and effective lubrication and maintaining its normal operation and service life.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An air conditioning system, characterized in that, include: compressor; Indoor heat exchange unit; An outdoor heat exchange unit, wherein the outdoor heat exchange unit includes multiple outdoor heat exchangers; A control valve assembly, which is connected to the compressor, the indoor heat exchange unit and the plurality of outdoor heat exchangers respectively; The control valve assembly has a defrost working position. In the defrost working position, the compressor's exhaust port is connected to the indoor heat exchange unit and part of the outdoor heat exchanger through the control valve assembly. The indoor heat exchange unit and part of the outdoor heat exchanger are connected to the remaining outdoor heat exchangers. The remaining outdoor heat exchangers are connected to the compressor's intake port through the control valve assembly.

2. The air conditioning system according to claim 1, characterized in that, The control valve assembly includes: Multiple outdoor control valves, the number of which is the same as the number of outdoor heat exchangers and they correspond one-to-one; the outdoor control valves are respectively connected to the exhaust port of the compressor, the intake port of the compressor and the corresponding outdoor heat exchanger; An indoor control valve is connected to the compressor's exhaust port, the compressor's intake port, and the indoor heat exchange unit.

3. The air conditioning system according to claim 2, characterized in that, The outdoor control valve and / or the indoor control valve are three-way valves.

4. The air conditioning system according to claim 1, characterized in that, The outdoor heat exchange unit also includes multiple outdoor throttling valves, the number of which is the same as the number of outdoor heat exchangers and they are connected in a one-to-one correspondence.

5. The air conditioning system according to claim 1, characterized in that, The outdoor heat exchanger is equipped with a temperature sensor.

6. The air conditioning system according to claim 5, characterized in that, It also includes a controller, which is electrically connected to the temperature sensor and the control valve group.

7. The air conditioning system according to any one of claims 1 to 6, characterized in that, The indoor heat exchange unit is multiple, and the control valve group has a first working position and / or a second working position; In the first working position, the compressor's exhaust port is connected to the outdoor heat exchange unit and part of the indoor heat exchange unit through the control valve group, the outdoor heat exchange unit and part of the indoor heat exchange unit are connected to the remaining indoor heat exchange unit, and the remaining indoor heat exchange unit is connected to the compressor's intake port through the control valve group. In the second operating position, the compressor's exhaust port is connected to a portion of the indoor heat exchange units via the control valve assembly. The portion of the indoor heat exchange units is connected to the outdoor heat exchange unit and the remaining indoor heat exchange units, respectively. The outdoor heat exchange unit and the remaining indoor heat exchange units are connected to the compressor's intake port via the control valve assembly.

8. The air conditioning system according to claim 7, characterized in that, The indoor heat exchange unit includes multiple indoor heat exchangers connected in parallel, and each indoor heat exchanger is connected to an indoor electronic expansion valve.

9. The air conditioning system according to any one of claims 1 to 6, characterized in that, A water collection device is installed below the outdoor heat exchanger.

10. The air conditioning system according to claim 9, characterized in that, An oil separator is provided between the control valve assembly and the compressor's exhaust port.

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