Multi-split air conditioning system

Abstract

This utility model relates to the field of air conditioning technology and provides a multi-split air conditioning system. The system includes a compressor, an outdoor heat exchange unit, multiple indoor heat exchange units, and a control valve assembly. The control valve assembly has a first working position and a second working position. In the first working position, the compressor exhaust port is connected to the outdoor heat exchange unit and some indoor heat exchange units through the control valve assembly. The outdoor heat exchange unit and some indoor heat exchange units are connected to the remaining indoor heat exchange units, and the remaining indoor heat exchange units are connected to the compressor intake port through the control valve assembly. In the second working position, the compressor exhaust port is connected to some indoor heat exchange units through the control valve assembly. Some indoor heat exchange units are connected to the outdoor heat exchange unit and the remaining indoor heat exchange units, and the outdoor heat exchange unit and the remaining indoor heat exchange units are connected to the compressor intake port through the control valve assembly. The system can achieve zoned temperature control of multiple indoor heat exchange units within the same operating cycle, meeting the combined use of different indoor areas for cooling and heating.

Description

Technical Field

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

[0002] Air conditioning systems regulate indoor temperature by transferring heat through the circulation of refrigerant. With the continuous expansion and diversification of modern building functions, the demands for temperature control systems in different functional areas within the same building are becoming increasingly differentiated. For example, office areas, meeting areas, and rest areas may have different control requirements for temperature, humidity, and air circulation at different times. Furthermore, factors such as building orientation, usage time, and occupancy density further exacerbate the differentiated needs for air conditioning system operation modes in each zone.

[0003] In existing technologies, multi-split air conditioning systems typically use one outdoor unit connected to multiple indoor units, enabling temperature control in multiple areas within a building.

[0004] However, the aforementioned multi-split air conditioning system adopts a uniform cooling or heating operation mode, meaning that the entire system can only operate in cooling or heating mode at the same time. When the cooling and heating needs of different areas inside the building are inconsistent, the system is unable to perform differentiated temperature control according to the actual needs of each area, thus failing to meet the complex working conditions where some areas need cooling while others need heating. Utility Model Content

[0005] This utility model provides a multi-split air conditioning system to solve the problem that existing multi-split systems can only operate in cooling or heating mode at the same time, and cannot meet the simultaneous cooling and heating needs of different areas inside a building. It can perform zoned temperature control of the indoor space, so that multiple indoor areas can simultaneously meet the combined needs of cooling and heating.

[0006] This utility model provides a multi-split air conditioning system, including: compressor; Outdoor heat exchange unit; Multiple indoor heat exchange units; A control valve assembly, which is connected to the compressor, the outdoor heat exchange unit, and the plurality of indoor heat exchange units respectively; The control valve assembly has a first working position and a second working position. In the first working position, the exhaust port of the compressor is connected to the outdoor heat exchange unit and part of the indoor heat exchange unit through the control valve assembly. The outdoor heat exchange unit and part of the indoor heat exchange unit are connected to the remaining indoor heat exchange units. The remaining indoor heat exchange units are connected to the intake port of the compressor through the control valve assembly. 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.

[0007] According to the multi-split air conditioning system provided by this utility model, the control valve group includes: An outdoor control valve is connected to the compressor's exhaust port, the compressor's intake port, and the outdoor heat exchange unit, respectively. Multiple indoor control valves are provided, with the number of indoor control valves being the same as and corresponding one-to-one with the number of indoor heat exchange units; the indoor control valves are respectively connected to the exhaust port of the compressor, the intake port of the compressor, and the corresponding indoor heat exchange unit.

[0008] According to the present invention, a multi-split air conditioning system is provided, wherein the plurality of indoor heat exchange units include a first indoor heat exchange unit and a second indoor heat exchange unit, and the plurality of indoor control valves include a first indoor three-way valve and a second indoor three-way valve. The first port of the first indoor three-way valve is connected to the exhaust port of the compressor, the second port of the first indoor three-way valve is connected to the intake port of the compressor, and the third port of the first indoor three-way valve is connected to the first indoor heat exchange unit. The first port of the second indoor three-way valve is connected to the exhaust port of the compressor, the second port of the second indoor three-way valve is connected to the intake port of the compressor, and the third port of the second indoor three-way valve is connected to the second indoor heat exchange unit.

[0009] According to the present invention, in a multi-split air conditioning system, the outdoor control valve and / or the indoor control valve are solenoid valves.

[0010] According to the present invention, a multi-split air conditioning system is provided, wherein the control valve group has a third working position, in which the exhaust port of the compressor is connected to the outdoor heat exchange unit through the control valve group, the outdoor heat exchange unit is connected to a plurality of indoor heat exchange units respectively, and the plurality of indoor heat exchange units are connected to the intake port of the compressor through the control valve group.

[0011] According to the present invention, a multi-split air conditioning system is provided, wherein the control valve group has a fourth working position, wherein the exhaust port of the compressor is connected to a plurality of indoor heat exchange units through the control valve group, the plurality of indoor heat exchange units are connected to an outdoor heat exchange unit, and the outdoor heat exchange unit is connected to the intake port of the compressor through the control valve group.

[0012] According to the present invention, a multi-split 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.

[0013] According to the present invention, a multi-split air conditioning system is provided, wherein a gas-liquid separator is provided between the control valve group and the air intake of the compressor.

[0014] According to the present invention, in a multi-split air conditioning system, the outdoor heat exchange unit is connected to a liquid pipe shut-off valve on the side away from the control valve group.

[0015] According to the present invention, a multi-split air conditioning system is provided, wherein a gas pipe shut-off valve is provided between the control valve group and the indoor heat exchange unit.

[0016] The multi-split air conditioning system provided by this utility model, by setting a control valve group between the compressor and the outdoor heat exchange unit and multiple indoor heat exchange units, and the control valve group has two switchable working positions, enables the system to achieve zoned temperature control of multiple indoor heat exchange units within the same operating cycle. That is, the area corresponding to some indoor heat exchange units is heated, while the area corresponding to other indoor heat exchange units is cooled, thereby meeting the complex usage scenarios of different indoor areas with different heating and cooling needs, thus effectively improving the system's operational flexibility and adaptability to complex environments, and enhancing user comfort. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is one of the schematic diagrams of the multi-split air conditioning system provided by this utility model.

[0019] Figure 2 This is the second schematic diagram of the principle structure of the multi-split air conditioning system provided by this utility model.

[0020] Figure 3 This is a schematic diagram of the multi-split air conditioning system provided by this utility model in the summer for cooling the entire area.

[0021] Figure 4 This is a schematic diagram of the multi-split air conditioning system provided by this utility model, where zone A is cooling and zone B is heating during the summer.

[0022] Figure 5 This is a schematic diagram of the multi-split air conditioning system provided by this utility model, where zone A is heating and zone B is cooling during the summer.

[0023] Figure 6 This is a schematic diagram of the multi-split air conditioning system provided by this utility model in winter, providing heating to the entire area.

[0024] Figure 7 This is a schematic diagram of the multi-split air conditioning system provided by this utility model, where area A is cooling and area B is heating during winter.

[0025] Figure 8 This is a schematic diagram of the multi-split air conditioning system provided by this utility model, where zone A is heating and zone B is cooling during winter.

[0026] Figure label: 10. Outdoor unit; 20. Indoor unit; 100. Compressor; 200. Outdoor heat exchange unit; 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; 400. Control valve assembly; 410. Outdoor control valve; 420. Indoor control valve; 402. First indoor three-way valve; 403. Second indoor three-way valve; 500. Gas-liquid separator; 600. Liquid pipe shut-off valve; 700. Tracheal shut-off valve. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The following is combined with Figures 1-8 This invention describes a multi-split air conditioning system.

[0033] An embodiment of this utility model proposes a multi-split air conditioning system, such as... Figure 1 and Figure 2 As shown, the multi-split air conditioning system includes an outdoor unit 10 and an indoor unit 20. The indoor unit 20 includes multiple indoor heat exchange units 300, and the outdoor unit 10 includes a compressor 100, an outdoor heat exchange unit 200, and a control valve assembly 400. The control valve assembly 400 is connected to the compressor 100, the outdoor heat exchange unit 200, and the multiple indoor heat exchange units 300 respectively. The multiple indoor heat exchange units 300 are connected in parallel to the outdoor heat exchange unit 200.

[0034] The control valve assembly 400 has a first working position and a second working position. 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 units 300 through the control valve assembly 400. The outdoor heat exchange unit 200 and part of the indoor heat exchange units 300 are combined and then connected to the remaining indoor heat exchange units 300. The remaining indoor heat exchange units 300 are connected to the suction port of the compressor 100 through the control valve assembly 400. In the second working position, the exhaust port of the compressor 100 is connected to part of the indoor heat exchange units 300 through the control valve assembly 400. The part of the indoor heat exchange units 300 are connected to the outdoor heat exchange unit 200 and the remaining indoor heat exchange units 300. 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.

[0035] 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.

[0036] Specifically, when the multi-split air conditioning system operates in cooling mode, the control valve assembly 400 is in its first working position. At this time, the discharge port of the compressor 100 delivers high-temperature, high-pressure refrigerant to the outdoor heat exchange unit 200 and part of the indoor heat exchange units 300 through 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 indoor area corresponding to that part of the indoor heat exchange units 300. 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 heat exchange to cool the indoor area corresponding to the remaining indoor heat exchange units 300. Finally, the refrigerant after heat exchange in the remaining indoor heat exchange units 300 flows back to the suction port of the compressor 100 through 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.

[0037] When the multi-split air conditioning system operates in heating mode, the control valve assembly 400 is in its second operating 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 the 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 to cool 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 multi-split air conditioning system is operating in heating mode, some indoor heat exchange units 300 can be used for heating while the remaining indoor heat exchange units 300 are used for cooling. This allows for zoned temperature control of multiple indoor heat exchange units 300 within the same operating cycle, enabling some indoor areas to be heated while others are cooled, thus meeting the combined cooling and heating needs of multiple indoor areas simultaneously.

[0038] The multi-split 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.

[0039] In one embodiment of this utility model, such as Figure 2 and Figure 3 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.

[0040] Understandably, the control valve assembly 400 also has a third operating position. When the multi-split 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.

[0041] In one embodiment of this utility model, such as Figure 2 and Figure 6 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.

[0042] Understandably, the control valve assembly 400 also has a fourth operating position. When the multi-split 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.

[0043] 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.

[0044] In one embodiment of this utility model, such as Figure 1 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.

[0045] 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.

[0046] 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.

[0047] 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, meeting the needs of multiple indoor areas to cool and heat simultaneously or independently, thus improving the system's operational flexibility.

[0048] Optionally, the outdoor control valve 410 can be a solenoid valve; of course, the indoor control valve 420 can also be a solenoid valve.

[0049] 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.

[0050] In one specific embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the multi-split 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, and the outdoor control valve 410 includes an outdoor three-way valve connected to the outdoor heat exchanger. There are two indoor heat exchange units 300, namely a first indoor heat exchange unit 301 and a second indoor heat exchange unit 302. The indoor area corresponding to the first indoor heat exchange unit 301 is denoted as area A, and the indoor area corresponding to the second indoor heat exchange unit 302 is denoted 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.

[0051] The first port of the outdoor three-way valve is connected to the exhaust port of the compressor 100, the second port of the outdoor three-way valve is connected to the suction port of the compressor 100, and the third port of the outdoor three-way valve is connected to the outdoor heat exchanger.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] The operating modes of the multi-split air conditioning system in this embodiment include: First type: Summer all-area cooling mode like Figure 3 As shown, the control valve group 400 is in the third working position. The refrigerant is fed from the compressor 100 through the outdoor three-way valve and the outdoor heat exchanger into 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 respectively to the compressor 100, realizing refrigerant circulation. Thus, area A and area B are connected in parallel to achieve full-area cooling mode operation.

[0057] The second type is the summer cooling mode for Zone A and heating mode for Zone B. like Figure 4 As shown, the control valve group 400 is in the first working position I. The refrigerant enters the outdoor three-way valve and the second indoor three-way valve 403 from the compressor 100. It passes through the outdoor three-way valve and the 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.

[0058] The third type is the summer zone A heating + zone B cooling mode. like Figure 5 As shown, the control valve group 400 is in the first working position II. The refrigerant enters the outdoor three-way valve and the first indoor three-way valve 402 from the compressor 100. It passes through the outdoor three-way valve and the 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.

[0059] The fourth type is the winter all-area heating mode. like Figure 6 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, the refrigerant is heat-exchanged 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, the refrigerant is heat-exchanged 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 outdoor heat exchanger, and then returns to the compressor 100 through the outdoor three-way valve to complete the refrigerant cycle. Thus, zone A and zone B are connected in parallel to achieve full-zone heating mode operation.

[0060] Fifth type: Winter zone A cooling + zone B heating mode like Figure 7 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 outdoor heat exchanger and the first indoor heat exchange unit 301 (to cool area A) respectively. The two refrigerants flow into the compressor 100 after passing through the outdoor three-way valve and the first indoor three-way valve 402 respectively, completing the refrigerant cycle, thereby realizing the cooling of area A and the heating of area B at the same time.

[0061] The sixth type is the winter heating mode in Zone A combined with the cooling mode in Zone B. like Figure 8 As 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 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 outdoor three-way valve 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.

[0062] Understandably, by switching the three three-way valves (outdoor three-way valve, 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.

[0063] 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.

[0064] 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.

[0065] Optional, such as Figure 2 As shown, each indoor heat exchange unit 300 includes multiple indoor heat exchangers 310 connected in parallel, and each indoor heat exchanger 310 is connected to an indoor electronic expansion valve 320.

[0066] 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.

[0067] 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.

[0068] In one embodiment of this utility model, such as Figure 1 As shown, a gas-liquid separator 500 is provided between the control valve group 400 and the suction port of the compressor 100.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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. A multi-split air conditioning system, characterized in that, include: compressor; Outdoor heat exchange unit; Multiple indoor heat exchange units; A control valve assembly, which is connected to the compressor, the outdoor heat exchange unit, and the plurality of indoor heat exchange units respectively; The control valve assembly has a first working position and 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 assembly. The outdoor heat exchange unit and part of the indoor heat exchange unit are connected to the remaining indoor heat exchange units. The remaining indoor heat exchange units are connected to the compressor's intake port through the control valve assembly. 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.

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

3. The multi-split air conditioning system according to claim 2, characterized in that, The plurality of indoor heat exchange units include a first indoor heat exchange unit and a second indoor heat exchange unit, and the plurality of indoor control valves include a first indoor three-way valve and a second indoor three-way valve. The first port of the first indoor three-way valve is connected to the exhaust port of the compressor, the second port of the first indoor three-way valve is connected to the intake port of the compressor, and the third port of the first indoor three-way valve is connected to the first indoor heat exchange unit. The first port of the second indoor three-way valve is connected to the exhaust port of the compressor, the second port of the second indoor three-way valve is connected to the intake port of the compressor, and the third port of the second indoor three-way valve is connected to the second indoor heat exchange unit.

4. The multi-split air conditioning system according to claim 2, wherein, The outdoor control valve and / or the indoor control valve are solenoid valves.

5. The multi-split air conditioning system according to any one of claims 1 to 4, wherein, The control valve assembly has a third operating position. In the third operating position, the compressor's exhaust port is connected to the outdoor heat exchange unit through the control valve assembly. The outdoor heat exchange unit is connected to multiple indoor heat exchange units respectively. The multiple indoor heat exchange units are connected to the compressor's intake port through the control valve assembly. 6.The multi-split air conditioning system according to claim 5, characterized in that, The control valve assembly has a fourth operating position. In the fourth operating position, the compressor's exhaust port is connected to a plurality of indoor heat exchange units through the control valve assembly, the plurality of indoor heat exchange units are connected to the outdoor heat exchange unit, and the outdoor heat exchange unit is connected to the compressor's intake port through the control valve assembly.

7. The multi-split air conditioning system according to any one of claims 1 to 4, 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.

8. The multi-split air conditioning system according to claim 7, characterized in that, A gas-liquid separator is provided between the control valve group and the air intake of the compressor.

9. The multi-split air conditioning system according to claim 7, characterized in that, The outdoor heat exchange unit is connected to a liquid pipe shut-off valve on the side away from the control valve assembly. 10.The multi-split air conditioning system according to claim 7, wherein, A gas pipe shut-off valve is provided between the control valve group and the indoor heat exchange unit.

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