Multi-split air conditioning system

Abstract

This utility model relates to the field of air conditioner technology and discloses a multi-split air conditioner system. In cooling mode, the first guide component is in a first conducting state, and the second guide component is in a fourth conducting state. Refrigerant discharged from the outdoor heat exchanger enters the receiver through the first guide component, and refrigerant discharged from the receiver's outlet sequentially passes through the first flow channel and the second guide component to enter the indoor heat exchanger. In heating mode, the first guide component is in a second conducting state, and the second guide component is in a third conducting state. Refrigerant discharged from the indoor heat exchanger enters the receiver through the second guide component, and refrigerant discharged from the receiver's outlet sequentially passes through the first flow channel and the first guide component to enter the outdoor heat exchanger. This utility model solves the defect of existing multi-split air conditioner systems that cannot simultaneously optimize energy efficiency under different operating conditions, resulting in the APF (Average Power Filter) failing to reach the ideal value under each condition.

Description

Technical Field

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

[0002] Traditional multi-split air conditioning systems face various operating conditions, including full load and partial load for both cooling and heating. Under these different conditions, the system's refrigerant requirements vary significantly. Traditional systems cannot optimize energy efficiency for all operating conditions, making it difficult to achieve the ideal Annual Performance Factor (APF). Therefore, ensuring that multi-split air conditioning systems consistently meet optimal APF requirements under different operating conditions, thereby improving overall system energy efficiency, is a pressing issue for the industry. Utility Model Content

[0003] This utility model provides a multi-split air conditioner system to solve the defect of existing multi-split air conditioner systems that cannot simultaneously optimize energy efficiency under different operating conditions, resulting in the APF (Active Power Factor) of each operating condition being difficult to reach the ideal value. This invention enables the multi-split air conditioner system to meet the optimal APF requirement under different operating conditions, thereby improving the overall energy efficiency performance of the system.

[0004] This utility model provides a multi-split air conditioning system, including:

[0005] Outdoor heat exchanger and indoor heat exchanger;

[0006] First guide assembly and second guide assembly;

[0007] A liquid receiver is installed in the refrigerant flow path between the outdoor heat exchanger and the indoor heat exchanger for storing refrigerant;

[0008] Under refrigeration conditions, the first guide component is in a first conducting state, and the second guide component is in a fourth conducting state. The refrigerant discharged from the outdoor heat exchanger enters the liquid receiver through the first guide component, and the refrigerant discharged from the liquid receiver enters the indoor heat exchanger through the second guide component.

[0009] In heating mode, the first guide component is in the second conducting state, and the second guide component is in the third conducting state. The refrigerant discharged from the indoor heat exchanger enters the liquid receiver through the second guide component, and the refrigerant discharged from the liquid receiver enters the outdoor heat exchanger through the first guide component.

[0010] The multi-split air conditioning system provided by this utility model also includes:

[0011] An auxiliary heat exchanger has a first flow channel and a second flow channel; the inlet of the liquid reservoir is connected to the outdoor heat exchanger through the first guide component and also to the indoor heat exchanger through the second guide component; the outlet of the liquid reservoir is connected to one end of the first flow channel, and the other end of the first flow channel is connected to the outdoor heat exchanger and the indoor heat exchanger through the first guide component and the second guide component, respectively.

[0012] The first throttling component, the other end of the first flow channel is also connected to one end of the second flow channel through the first throttling component, and the other end of the second flow channel is connected to the air intake of the compressor.

[0013] According to the multi-split air conditioning system provided by this utility model, the exhaust port of the liquid receiver is connected to the suction port of the compressor.

[0014] According to the multi-split air conditioning system provided by this utility model, the first guide component includes:

[0015] The first three-way pilot valve has its A port connected to one end of the outdoor heat exchanger, its B port connected to the inlet of the liquid reservoir, and its C port connected to the other end of the first flow channel.

[0016] According to the multi-split air conditioning system provided by this utility model, the second guide component includes:

[0017] The second three-way pilot valve has its A port connected to one end of the indoor heat exchanger; its B port connected to the liquid inlet of the liquid reservoir; and its C port connected to the other end of the first flow channel.

[0018] The multi-split air conditioning system provided by this utility model also includes:

[0019] The first expansion assembly, one end of the outdoor heat exchanger is connected to port A of the first three-way pilot valve through the first expansion assembly;

[0020] The second expansion assembly connects one end of the indoor heat exchanger to port A of the second three-way pilot valve.

[0021] The multi-split air conditioning system provided by this utility model also includes:

[0022] A four-way valve, wherein the D port of the four-way valve is connected to the exhaust port of the compressor, the C port of the four-way valve is connected to the other end of the outdoor heat exchanger, the E port of the four-way valve is connected to the other end of the indoor heat exchanger, and the S port of the four-way valve is connected to the suction port of the compressor.

[0023] The multi-split air conditioning system provided by this utility model also includes:

[0024] A gas-liquid separator, wherein the inlet of the gas-liquid separator is connected to the S port of the four-way valve and the outlet of the liquid reservoir; and the outlet of the gas-liquid separator is connected to the suction port of the compressor.

[0025] The multi-split air conditioning system provided by this utility model also includes:

[0026] An oil separator is provided, through which the compressor's exhaust port is connected to the D port of the four-way valve.

[0027] According to the multi-split air conditioning system provided by this utility model, there are multiple indoor heat exchangers; one end of each of the multiple indoor heat exchangers is connected to the liquid inlet of the liquid receiver through the second guide component, and the other end of each of the multiple indoor heat exchangers is connected to the E port of the four-way valve.

[0028] The multi-split air conditioning system provided by this utility model, by setting up a liquid receiver, can store or release refrigerant when the system load changes. For example, it can store excess refrigerant under low load conditions and replenish refrigerant in a timely manner under high load conditions to ensure heat exchange efficiency. The system also includes a first guide component with first and second conducting states, and a second guide component with third and fourth conducting states, which can control the flow direction of the refrigerant to ensure that the refrigerant circulates along a predetermined path, thus ensuring heat exchange efficiency. The integration of the liquid receiver, the first guide component, and the second guide component technologies creates a dynamic refrigerant (i.e., refrigerant) control scheme. It can automatically adjust the refrigerant circulation volume according to load changes under different cooling and heating conditions. During high-temperature cooling, the liquid receiver quickly releases refrigerant, and the first and second guide components stabilize the flow direction. During low-temperature heating, the three components work together to reduce refrigerant retention and enhance heating capacity. By precisely controlling the refrigerant circulation volume, it reduces the compressor's ineffective power consumption and pipeline heat loss, achieving optimal energy efficiency under all operating conditions. This results in a breakthrough improvement in APF (Advanced Performance Factor), solving the defect in existing multi-split air conditioning systems that cannot simultaneously optimize energy efficiency under different operating conditions, leading to the difficulty in achieving the ideal APF value under various operating conditions. Attached Figure Description

[0029] 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.

[0030] Figure 1This is a schematic diagram of the structure of the multi-split air conditioning system provided by this utility model under cooling conditions. The arrows in the diagram represent the direction of refrigerant flow.

[0031] Figure 2 This is a schematic diagram of the structure of the multi-split air conditioning system provided by this utility model under heating conditions. The arrows in the diagram represent the direction of refrigerant flow.

[0032] Figure label:

[0033] 100. Compressor;

[0034] 210. Indoor heat exchanger; 220. Outdoor heat exchanger; 230. Auxiliary heat exchanger;

[0035] 310. First guide component; 320. Second guide component;

[0036] 400. Liquid reservoir;

[0037] 500. First throttling component;

[0038] 610. First expansion assembly; 620. Second expansion assembly;

[0039] 700, Four-way valve;

[0040] 800. Gas-liquid separator;

[0041] 900. Oil separator. Detailed Implementation

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] In the embodiments of this utility model, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, it should be noted that the serial numbers assigned to the described objects in this utility model, such as "first," "second," etc., are only used to distinguish the described objects and do not have any sequential or technical meaning.

[0048] The following is combined Figure 1 and Figure 2 The structure of the multi-split air conditioning system of this utility model is described in detail.

[0049] like Figure 1 and Figure 2 As shown, this utility model provides a multi-split air conditioning system. The multi-split air conditioning system includes a compressor 100, an outdoor heat exchanger 220, an indoor heat exchanger 210, a first guide assembly 310, a second guide assembly 320, and a liquid receiver 400. The first guide assembly 310 has a first conductive state and a second conductive state; the second guide assembly 320 has a third conductive state and a fourth conductive state; the liquid receiver 400 is disposed in the refrigerant flow path between the outdoor heat exchanger 220 and the indoor heat exchanger 210, and is used to store refrigerant.

[0050] Under refrigeration conditions, the first guide component 310 is in the first conducting state, and the second guide component 320 is in the fourth conducting state. The refrigerant discharged from the outdoor heat exchanger 220 enters the liquid receiver 400 through the first guide component 310, and the refrigerant discharged from the liquid outlet of the liquid receiver 400 enters the indoor heat exchanger 210 through the second guide component 320.

[0051] In heating mode, the first guide component 310 is in the second conducting state, and the second guide component 320 is in the third conducting state. The refrigerant discharged from the indoor heat exchanger 210 enters the liquid receiver 400 through the second guide component 320, and the refrigerant discharged from the liquid outlet of the liquid receiver 400 enters the outdoor heat exchanger 220 through the first guide component 310.

[0052] In this embodiment, by providing a liquid receiver 400, refrigerant can be stored or released when the system load changes. For example, excess refrigerant can be stored under low load conditions, and refrigerant can be replenished in a timely manner under high load conditions to ensure heat exchange efficiency. The provision of a first guide component 310 with a first and second conducting state, and a second guide component 320 with a third and fourth conducting state, can control the flow direction of the refrigerant, ensuring that the refrigerant circulates along a predetermined path and ensuring heat exchange efficiency. The integration of the liquid receiver 400, the first guide component 310, and the second guide component 320 creates a dynamic refrigerant (i.e., refrigerant) control scheme. This scheme automatically adjusts the refrigerant circulation volume based on load changes during different cooling and heating conditions. During high-temperature cooling, the liquid receiver 400 rapidly releases refrigerant, and the first and second guide components 310 and 320 stabilize the flow direction. During low-temperature heating, the three components work together to reduce refrigerant retention and enhance heating capacity. Precise control of the refrigerant circulation volume reduces ineffective compressor power consumption and pipeline heat loss, achieving optimal energy efficiency under all operating conditions. This results in a breakthrough improvement in APF (Average Power Filter), solving the problem that existing multi-split air conditioning systems cannot simultaneously optimize energy efficiency under different operating conditions, leading to difficulties in achieving ideal APF values ​​under various conditions.

[0053] In some embodiments, the multi-split air conditioning system further includes an auxiliary heat exchanger 230 and a first throttling assembly 500; the auxiliary heat exchanger 230 has a first flow channel and a second flow channel; the inlet of the liquid receiver 400 is connected to one end of the outdoor heat exchanger 220 through a first guide assembly 310, and the inlet of the liquid receiver 400 is also connected to one end of the indoor heat exchanger 210 through a second guide assembly 320; the outlet of the liquid receiver 400 is connected to the suction port of the compressor 100; the outlet of the liquid receiver 400 is connected to one end of the first flow channel, and the other end of the first flow channel is connected to the first guide assembly 310 and the second guide assembly 320; the other end of the first flow channel is also connected to one end of the second flow channel through the first throttling assembly 500, and the other end of the second flow channel is connected to the suction port of the compressor 100.

[0054] Under refrigeration conditions, the first guide component 310 is in the first conducting state, and the second guide component 320 is in the fourth conducting state. The refrigerant discharged from the outdoor heat exchanger 220 enters the liquid receiver 400 through the first guide component 310, and the refrigerant discharged from the liquid outlet of the liquid receiver 400 passes through the first flow channel and the second guide component 320 in sequence to enter the indoor heat exchanger 210.

[0055] In heating mode, the first guide component 310 is in the second conducting state and the second guide component 320 is in the third conducting state. The refrigerant discharged from the indoor heat exchanger 210 enters the liquid receiver 400 through the second guide component 320. The refrigerant discharged from the liquid outlet of the liquid receiver 400 passes through the first flow channel and the first guide component 310 in sequence and enters the outdoor heat exchanger 220.

[0056] like Figure 1As shown, under refrigeration conditions, the high-temperature, high-pressure gaseous refrigerant discharged from the compressor 100 enters the outdoor heat exchanger 220, where it condenses into a medium-temperature, high-pressure liquid refrigerant. This medium-temperature, high-pressure liquid refrigerant flows into the receiver 400 according to the flow path set by the first guide component 310 (which is in a first conducting state). Excess liquid refrigerant is temporarily stored in the receiver 400 based on system load requirements. Subsequently, the liquid refrigerant flowing out of the receiver 400 enters the first flow channel of the auxiliary heat exchanger 230. The liquid refrigerant in the first flow channel is further cooled by the refrigerant in the second flow channel, increasing subcooling. Simultaneously, the low-temperature, low-pressure gaseous refrigerant in the second flow channel is heated. After heat exchange in the auxiliary heat exchanger 230, a portion of the subcooled liquid refrigerant is further depressurized and cooled by the first throttling component 500, transforming into a low-temperature, low-pressure gas-liquid two-phase mixture before entering the second flow channel. The other portion flows into the indoor heat exchanger 210 according to the flow path set by the second guiding component 320 (which is in the fourth conducting state). Within the indoor heat exchanger 210, it rapidly vaporizes into a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant flowing out of the indoor heat exchanger 210 returns to the compressor 100, completing the refrigerant cycle. This achieves precise control of the refrigerant quantity, ensuring maximum APF (Advanced Per Flow Factor).

[0057] like Figure 2 As shown, under heating conditions, the high-temperature, high-pressure gaseous refrigerant discharged from the compressor 100 enters the indoor heat exchanger 210, where it condenses into a medium-temperature, high-pressure liquid refrigerant. This medium-temperature, high-pressure liquid refrigerant flows into the receiver 400 according to the flow path set by the second guide component 320 (which is in a third conducting state). In the receiver 400, excess liquid refrigerant is temporarily stored according to system load requirements. Subsequently, the liquid refrigerant flowing out of the receiver 400 enters the first flow channel of the auxiliary heat exchanger 230. The liquid refrigerant in the first flow channel is further cooled by the refrigerant in the second flow channel, increasing subcooling, while the low-temperature, low-pressure gaseous refrigerant in the second flow channel is heated. After heat exchange in the auxiliary heat exchanger 230, a portion of the subcooled liquid refrigerant is further depressurized and cooled by the first throttling component 500, transforming into a low-temperature, low-pressure gas-liquid two-phase mixture before entering the second flow channel. The other portion flows into the outdoor heat exchanger 220 according to the flow path set by the first guiding component 310 (which is in the second conducting state). Within the outdoor heat exchanger 220, it rapidly vaporizes into a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant flowing out of the outdoor heat exchanger 220 returns to the compressor 100, completing the refrigerant cycle. This achieves precise control of the refrigerant quantity, ensuring maximum APF (Advanced Per Flow Factor).

[0058] In some embodiments, the exhaust port of the liquid receiver 400 is connected to the intake port of the compressor 100 to replenish the compressor 100 with gas.

[0059] In some embodiments, the first throttling component 500 is a throttling valve; the inlet end of the throttling valve is connected to the other end of the first flow channel, and the outlet end of the throttling valve is connected to one end of the second flow channel. By setting the throttling valve, the subcooled liquid refrigerant entering the second flow channel is further throttled and cooled, causing the cold liquid refrigerant to be converted into a low-temperature, low-pressure gaseous refrigerant before entering the second flow channel. The low-temperature, low-pressure gaseous refrigerant in the second flow channel exchanges heat with the liquid refrigerant in the first flow channel, increasing the subcooling degree of the liquid refrigerant.

[0060] In some embodiments, the first guiding assembly 310 includes a first three-way guiding valve; port A of the first three-way guiding valve is connected to one end of the outdoor heat exchanger 220, port B of the first three-way guiding valve is connected to the liquid inlet of the liquid receiver 400, and port C of the first three-way guiding valve is connected to the other end of the first flow channel. When ports A and B of the first three-way guiding valve are connected, the first three-way guiding valve is in a first conducting state. When ports A and C of the first three-way guiding valve are connected, the first three-way guiding valve is in a second conducting state. In other words, under cooling conditions, the medium-temperature, high-pressure liquid refrigerant flowing out of the outdoor heat exchanger 220 flows into the liquid receiver 400 through ports A and B of the first three-way guiding valve. Under heating conditions, the subcooled liquid refrigerant flowing out of the other end of the first flow channel flows into the outdoor heat exchanger 220 through ports C and A of the first three-way guiding valve.

[0061] In some embodiments, the second guiding assembly 320 includes a second three-way guiding valve; port A of the second three-way guiding valve is connected to one end of the indoor heat exchanger 210; port B of the second three-way guiding valve is connected to the inlet of the liquid receiver 400; and port C of the second three-way guiding valve is connected to the other end of the first flow channel. When ports A and B of the second three-way guiding valve are connected, the second three-way guiding valve is in a third conducting state. When ports A and C of the second three-way guiding valve are connected, the second three-way guiding valve is in a fourth conducting state. In other words, under heating conditions, the medium-temperature, high-pressure liquid refrigerant flowing out of the indoor heat exchanger 210 flows into the liquid receiver 400 through ports A and B of the second three-way guiding valve. Under cooling conditions, the subcooled liquid refrigerant flowing out of the other end of the first flow channel flows into the indoor heat exchanger 210 through ports C and A of the second three-way guiding valve.

[0062] In some embodiments, the multi-split air conditioning system further includes a first expansion assembly 610 and a second expansion assembly 620; one end of the outdoor heat exchanger 220 is connected to port A of the first three-way pilot valve through the first expansion assembly 610; one end of the indoor heat exchanger 210 is connected to port A of the second three-way pilot valve through the second expansion assembly 620. By setting the first expansion assembly 610 and the second expansion assembly 620, the refrigerant pressure is reduced and throttled, thereby automatically adjusting the refrigerant flow and maintaining efficient system operation.

[0063] Furthermore, at least one of the first expansion assembly 610 and the second expansion assembly 620 is an electronic expansion valve. The electronic expansion valve can be connected to a controller to achieve automated control.

[0064] In some embodiments, the auxiliary heat exchanger 230 is an economizer.

[0065] In some embodiments, the reservoir 400 is a high-pressure reservoir.

[0066] In some embodiments, the multi-split air conditioning system further includes a four-way valve 700; the D port of the four-way valve 700 is connected to the discharge port of the compressor 100, the C port of the four-way valve 700 is connected to the other end of the outdoor heat exchanger 220, the E port of the four-way valve 700 is connected to the other end of the indoor heat exchanger 210, and the S port of the four-way valve 700 is connected to the suction port of the compressor 100. The four-way valve 700 can be configured to switch the refrigerant according to the operating conditions, thereby achieving the purpose of cooling and heating.

[0067] In some embodiments, the multi-split air conditioning system further includes a gas-liquid separator 800; the inlet of the gas-liquid separator 800 is connected to the S port of the four-way valve 700 and the outlet of the liquid receiver 400; the outlet of the gas-liquid separator 800 is connected to the suction port of the compressor 100. In other words, the refrigerant flowing out from the S port of the four-way valve 700, the refrigerant flowing out from the other end of the second flow channel, and the refrigerant flowing out from the outlet of the liquid receiver 400 are combined and flow into the gas-liquid separator 800. After gas-liquid separation by the gas-liquid separator 800, it is then drawn into the compressor 100. By setting up the gas-liquid separator 800, liquid slugging in the compressor 100 can be avoided.

[0068] Furthermore, the air inlet of the gas-liquid separator 800 is also connected to the other end of the second flow channel.

[0069] In some embodiments, the multi-split air conditioning system further includes an oil separator 900; the exhaust port of the compressor 100 is connected to the D port of the four-way valve 700 through the oil separator 900. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 100 is separated from the lubricating oil by the oil separator 900 and then enters the outdoor heat exchanger 220 or the indoor heat exchanger 210, ensuring efficient and stable operation of the system.

[0070] In some embodiments, there are multiple indoor heat exchangers 210; one end of each of the multiple indoor heat exchangers 210 is connected to the liquid inlet of the liquid receiver 400 through the second guide assembly 320, and the other end of each of the multiple indoor heat exchangers 210 is connected to the E port of the four-way valve. In the refrigeration condition, the second guide assembly 320 is in the fourth conducting state. The refrigerant flowing out from the other end of the first flow channel is divided into multiple paths after passing through the second guide assembly 320, and flows into the multiple indoor heat exchangers 210 one by one; it vaporizes in the indoor heat exchangers 210; the low-temperature and low-pressure gaseous refrigerant flowing out from the indoor heat exchangers 210 is collected and then passed through the E port and S port of the four-way valve, and is re-drawn into the compressor 100. In heating mode, the second guide component 320 is in the third conducting state. The high-temperature and high-pressure refrigerant flowing out from the E port of the four-way valve is divided into multiple paths, and each path of high-temperature and high-pressure refrigerant corresponds to one of the multiple indoor heat exchangers 210. The high-temperature and high-pressure refrigerant is cooled in the indoor heat exchanger 210 to form a medium-temperature and high-pressure liquid refrigerant. The medium-temperature and high-pressure liquid refrigerant flowing out from the indoor heat exchanger 210 is collected and enters the liquid receiver 400 through the second guide component 320.

[0071] Specifically, one end of each of the multiple indoor heat exchangers 210 is connected to port A of the second three-way pilot valve, and the other end of each of the multiple indoor heat exchangers 210 is connected to port E of the four-way valve.

[0072] Furthermore, there are multiple second expansion components 620. Each of the multiple second expansion components 620 corresponds to one of the multiple indoor heat exchangers 210.

[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: First guide assembly (310) and second guide assembly (320); A liquid receiver (400) is installed in the refrigerant flow path between the outdoor heat exchanger (220) and the indoor heat exchanger (210) for storing refrigerant; Under refrigeration conditions, the first guide component (310) is in the first conducting state, and the second guide component (320) is in the fourth conducting state. The refrigerant discharged from the outdoor heat exchanger (220) enters the liquid receiver (400) through the first guide component (310), and the refrigerant discharged from the liquid receiver (400) enters the indoor heat exchanger (210) through the second guide component (320). In heating mode, the first guide component (310) is in the second conducting state, and the second guide component (320) is in the third conducting state. The refrigerant discharged from the indoor heat exchanger (210) enters the liquid receiver (400) through the second guide component (320), and the refrigerant discharged from the liquid receiver (400) enters the outdoor heat exchanger (220) through the first guide component (310).

2. The multi-split air conditioning system according to claim 1, characterized in that, Also includes: The auxiliary heat exchanger (230) has a first flow channel and a second flow channel; The inlet of the liquid reservoir (400) is connected to the outdoor heat exchanger (220) through the first guide assembly (310) and also to the indoor heat exchanger (210) through the second guide assembly (320); the outlet of the liquid reservoir (400) is connected to one end of the first flow channel, and the other end of the first flow channel is connected to the outdoor heat exchanger (220) and the indoor heat exchanger (210) respectively through the first guide assembly (310) and the second guide assembly (320); The first throttling assembly (500) is connected to one end of the second flow channel through the first throttling assembly (500), and the other end of the second flow channel is connected to the suction port of the compressor (100).

3. The multi-split air conditioning system according to claim 1, characterized in that, The exhaust port of the liquid reservoir (400) is connected to the intake port of the compressor (100).

4. The multi-split air conditioning system according to claim 2, characterized in that, The first guide component (310) includes: The first three-way pilot valve has its A port connected to one end of the outdoor heat exchanger (220), its B port connected to the inlet of the liquid reservoir (400), and its C port connected to the other end of the first flow channel.

5. The multi-split air conditioning system according to claim 4, characterized in that, The second guide component (320) includes: The second three-way pilot valve has its A port connected to one end of the indoor heat exchanger (210); its B port is connected to the inlet of the liquid reservoir (400); and its C port is connected to the other end of the first flow channel.

6. The multi-split air conditioning system according to claim 5, characterized in that, Also includes: The first expansion assembly (610) is connected to the A port of the first three-way pilot valve through the first expansion assembly (610); The second expansion assembly (620) is connected at one end of the indoor heat exchanger (210) to the A port of the second three-way pilot valve.

7. The multi-split air conditioning system according to any one of claims 1 to 6, characterized in that, Also includes: A four-way valve (700) is provided, wherein its D port is connected to the exhaust port of the compressor (100), its C port is connected to the other end of the outdoor heat exchanger (220), its E port is connected to the other end of the indoor heat exchanger (210), and its S port is connected to the intake port of the compressor (100).

8. The multi-split air conditioning system according to claim 7, characterized in that, Also includes: A gas-liquid separator (800) is provided, wherein the inlet of the gas-liquid separator (800) is connected to the S port of the four-way valve (700) and the outlet of the liquid reservoir (400); and the outlet of the gas-liquid separator (800) is connected to the suction port of the compressor (100).

9. The multi-split air conditioning system according to claim 7, characterized in that, Also includes: An oil separator (900) is provided, through which the exhaust port of the compressor (100) is connected to the D port of the four-way valve (700).

10. The multi-split air conditioning system according to claim 7, characterized in that, The number of indoor heat exchangers (210) is multiple; one end of each of the multiple indoor heat exchangers (210) is connected to the inlet of the liquid reservoir (400) through the second guide assembly (320), and the other end of each of the multiple indoor heat exchangers (210) is connected to the E port of the four-way valve.

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