Multi-split air conditioning system

By introducing a fresh air system and air supply ducts into the multi-split air conditioning system, the problem of the air conditioning system failing to meet air quality requirements was solved, thus improving the user experience.

CN223976134UActive Publication Date: 2026-03-06QINGDAO HAIER INNOVATION TECH CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-27
Publication Date
2026-03-06

AI Technical Summary

Technical Problem

Existing multi-split air conditioning systems cannot meet users' air quality requirements, resulting in a poor user experience.

Method used

In a multi-split air conditioning system, multiple air supply ducts are set up to connect multiple rooms, and a fresh air system is introduced and connected to the indoor unit. Fresh air is blown to the room designated by the user through the air supply ducts to improve air quality.

Benefits of technology

By supplying air to designated rooms, air quality is improved, thereby enhancing the user experience.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN223976134U_ABST
    Figure CN223976134U_ABST
Patent Text Reader

Abstract

The utility model relates to the technical field of household appliances, and discloses a multi-split air conditioning system. The multi-split air conditioning system comprises an indoor unit, a fresh air system and an air supply pipe set. The indoor unit comprises an air supply assembly used for supplying air in the preset direction. The fresh air system communicates with the indoor unit and is used for conveying fresh air to the indoor unit; the air supply pipe set comprises a plurality of air supply pipelines which communicate with the air supply assembly, and any air supply pipeline is provided with at least one air supply opening. The indoor unit can blow fresh air conveyed by the fresh air system into a room through the air supply pipe set. Air supply outlets of the multiple air supply pipelines are formed in the multiple rooms respectively. In this way, the fresh air system can convey fresh air to the indoor unit, and then the indoor unit can blow the fresh air into a plurality of rooms through the air supply pipeline and the air supply outlets. Through the arrangement, the indoor unit can blow fresh air conveyed by the fresh air system into a room appointed by a user, so that the air quality in the room is improved, and the use experience of the user is improved.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] This application relates to the field of household appliance technology, such as a multi-split air conditioning system. Background Technology

[0002] With societal development, household refrigeration equipment such as air conditioners have become widely used in people's daily lives. To meet users' needs for simultaneous cooling or heating of multiple rooms, more and more users are choosing to install multi-split air conditioning systems. In related technologies, the multiple indoor units of a multi-split air conditioning system are mostly connected in parallel to the same refrigerant circuit, so that the outdoor unit can be connected through this refrigerant circuit.

[0003] In related technologies, in order to reduce the overall size of a multi-split air conditioning system, only one indoor unit is installed indoors, and the indoor unit is connected to multiple rooms through air supply ducts, so that air can be supplied to multiple rooms through one indoor unit.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] In related technologies, existing multi-split air conditioning systems are generally used to cool or heat multiple rooms separately, which cannot meet users' needs for air quality and results in a poor user experience.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a multi-split air conditioning system with multiple air supply ducts connected to multiple rooms. The indoor unit can supply air to these rooms through these ducts. Simultaneously, a fresh air system is connected to the indoor unit to deliver fresh air. This configuration allows the indoor unit to deliver the fresh air supplied by the fresh air system to a user-designated room, improving the air quality in that room and thus enhancing the user experience.

[0009] This disclosure provides a multi-split air conditioning system including: an indoor unit, a fresh air system, and a supply air duct assembly. The indoor unit includes a supply air assembly for supplying air in a preset direction; the fresh air system is connected to the indoor unit and supplies fresh air to it; the supply air duct assembly includes multiple supply air pipes, each connected to the supply air assembly, and each supply air pipe has at least one air outlet; wherein the indoor unit can blow the fresh air supplied by the fresh air system into the room through the supply air duct assembly.

[0010] In some embodiments, the fresh air system includes: a fresh air unit, a fresh air duct, and a valve component. The fresh air unit is located outdoors; the fresh air duct connects the fresh air unit and the indoor unit; the valve component is located in the fresh air duct and is used to block or unclog the fresh air duct.

[0011] In some embodiments, the valve body element is configured as a plate and is rotatably disposed within the fresh air duct via a pivot; wherein the valve body element can rotate about the pivot to block or unclog the air supply duct.

[0012] In some embodiments, the multi-split air conditioning system further includes a drive motor. The drive motor is connected to the rotating shaft of the valve body element; wherein the drive motor drives the valve body element to rotate between a first preset angle and a second preset angle to block or clear the air supply duct.

[0013] In some embodiments, the multi-split air conditioning system further includes: a return air box and a return air duct assembly. The return air box is connected to the indoor unit; the return air duct assembly includes multiple return air ducts, each of which is connected to the return air box, and each return air duct is provided with at least one return air outlet.

[0014] In some embodiments, a filter assembly is provided at the return air vent, and the filter assembly is snapped onto the return air vent by a snap-fit ​​connector.

[0015] In some embodiments, an air guide hood is also provided at the return air vent, and the air guide hood is installed on the outside of the filter assembly; wherein the air guide hood is snapped onto the return air vent by a snap-fit ​​component.

[0016] In some embodiments, the return air vent is configured as a circular structure, and both the filter assembly and the air guide hood are configured as circular structures corresponding to the return air vent.

[0017] In some embodiments, the multi-split air conditioning system further includes a lighting assembly. The lighting assembly is disposed corresponding to the return air vent or the supply air vent; wherein the lighting assembly is electrically connected to the indoor unit, and the indoor unit can control the operating state of the lighting assembly according to the operating state of the multi-split air conditioning system.

[0018] In some embodiments, the lighting assembly includes a light track and a luminaire. The light track is provided with a mounting groove; the luminaire is mounted in the mounting groove of the light track; wherein the light track is disposed within an air supply vent or an air return vent, or the light track is disposed on one side of the air supply vent or the air return vent.

[0019] The multi-split air conditioning system provided in this disclosure can achieve the following technical effects:

[0020] This disclosure provides a multi-split air conditioning system including: an indoor unit, a fresh air system, and a supply air duct assembly. The indoor unit includes an air supply assembly for supplying air in a preset direction; the fresh air system is connected to the indoor unit and supplies fresh air to it; the supply air duct assembly includes multiple supply air ducts, each connected to the air supply assembly, and each supply air duct has at least one air outlet; wherein the indoor unit can blow the fresh air supplied by the fresh air system into the room through the supply air duct assembly. The air outlets of the multiple supply air ducts are respectively located in multiple rooms. In this way, the fresh air system can supply fresh air to the indoor unit, and the indoor unit can then blow the fresh air into multiple rooms through the supply air ducts and air outlets. With this configuration, the indoor unit can blow the fresh air supplied by the fresh air system into a user-designated room to improve the air quality in that room, thereby improving the user experience.

[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a multi-split air conditioning system provided in an embodiment of this disclosure;

[0024] Figure 2 This is a schematic diagram of the structure of an indoor unit provided in an embodiment of this disclosure;

[0025] Figure 3 This is a schematic diagram of a fresh air duct provided in an embodiment of this disclosure;

[0026] Figure 4 This is a schematic diagram of the structure of a return air vent provided in an embodiment of this disclosure;

[0027] Figure 5 This is a schematic diagram of the structure of an air outlet provided in an embodiment of this disclosure.

[0028] Figure label:

[0029] 10: Indoor unit; 11: Fresh air system; 111: Fresh air unit; 112: Fresh air duct; 113: Valve body component; 1131: Rotary shaft; 114: Drive motor; 12: Air distribution box; 13: Return air box;

[0030] 20: Air supply duct assembly; 21: Air supply duct; 22: Air outlet;

[0031] 30: Return air duct assembly; 31: Return air duct; 32: Return air outlet; 33: Filter assembly;

[0032] 40: Lighting components. Detailed Implementation

[0033] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0034] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0035] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0036] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0037] Unless otherwise stated, the term "multiple" means two or more.

[0038] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0039] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0041] like Figures 1 to 5 As shown, this embodiment of the disclosure provides a multi-split air conditioning system, in which multiple air supply ducts 21 are respectively connected to multiple rooms, and the indoor unit 10 can supply air to multiple rooms through the multiple air supply ducts 21. At the same time, a fresh air system 11 is connected to the indoor unit 10 to supply fresh air to the indoor unit 10. With this configuration, the indoor unit 10 can blow the fresh air supplied by the fresh air system 11 to the room designated by the user to improve the air quality in the room, thereby improving the user experience.

[0042] like Figures 1 to 5 As shown, this embodiment of the present disclosure provides a multi-split air conditioning system including: an indoor unit 10, a fresh air system 11, and an air supply duct assembly 20. The indoor unit 10 includes an air supply assembly for supplying air in a preset direction; the fresh air system 11 is connected to the indoor unit 10 and is used to supply fresh air to the indoor unit 10; the air supply duct assembly 20 includes multiple air supply pipes 21, which are respectively connected to the air supply assembly, and each air supply pipe 21 is provided with at least one air outlet 22; wherein, the indoor unit 10 can blow the fresh air supplied by the fresh air system 11 into the room through the air supply duct assembly 20.

[0043] Specifically, the number and shape of the air supply ducts 2121 can be set according to the number and location of rooms to ensure that each room is equipped with at least one air supply outlet 2222. The fresh air system 11 includes a fresh air fan, and the fresh air system 1111 is connected to the indoor unit 1010. The fresh air fan is used to blow outdoor air to the indoor unit 10.

[0044] When the fresh air system 11 is operating, it draws in outdoor air and connects it to the indoor unit 10 via the fresh air duct 112. The fresh air fan then blows the outdoor air through the duct 112 to the indoor unit 10, which in turn blows the outdoor air into the corresponding room through the supply air duct 21 and the air outlet 22. With this configuration, the indoor unit 10 can deliver the fresh air supplied by the fresh air system 11 to the user's designated room, improving the air quality in that room and thus enhancing the user experience.

[0045] like Figure 2 and Figure 3 As shown, in some embodiments, the fresh air system 11 includes: a fresh air unit 111, a fresh air duct 112, and a valve element 113. The fresh air unit 111 is located outdoors; the fresh air duct 112 is used to connect the fresh air unit 111 and the indoor unit 10; the valve element 113 is located in the fresh air duct 112 and is used to block or unclog the fresh air duct 112.

[0046] Specifically, the fresh air unit 111 includes a fresh air fan, and a fresh air duct 112 connects the fresh air unit 111 and the indoor unit 10. A valve element 113 is located at the connection point between the fresh air duct 112 and the fresh air unit 111, or at the connection point between the fresh air duct 112 and the indoor unit 10. When the multi-split air conditioning system is operating in fresh air mode, the valve element 113 clears the fresh air duct 112 to allow fresh air to flow into the indoor unit 10. When the multi-split air conditioning system is in fresh air mode off, the valve element 113 blocks the fresh air duct 112 to prevent outdoor air from flowing into the room and to prevent indoor air from flowing out, thereby ensuring the cooling or heating effect of the indoor unit 10 on the room.

[0047] When the valve body element 113 clears the fresh air duct 112, the fresh air volume flowing into the indoor unit 10 can also be controlled by adjusting the opening degree of the valve body element 113.

[0048] Optionally, the fresh air duct 112 is equipped with a filter assembly 3333 to filter the air flowing into the indoor unit 10.

[0049] like Figure 2 and Figure 3 As shown, in some embodiments, the valve body element 113 is configured as a plate, and the valve body element 113 is rotatably disposed in the fresh air duct 112 via a rotating shaft 1131; wherein, the valve body element 113 can rotate around the rotating shaft 1131 to block or unclog the air supply duct 21.

[0050] Specifically, the cross-section of the fresh air duct 112 is configured as circular, and the valve body element 113 is configured as a corresponding circular plate. A rotating shaft 1131 is provided in the center of the valve body element 113, and the rotating shaft 1131 is rotatably connected to the fresh air duct 112. Thus, the valve body element 113 can rotate circumferentially around the rotating shaft 1131 to block or clear the fresh air duct 112. Simultaneously, the airflow into the indoor unit 10 can be controlled by adjusting the rotation angle of the valve body element 113.

[0051] like Figure 2 and Figure 3 As shown, in some embodiments, the multi-split air conditioning system further includes a drive motor 114. The drive motor 114 is connected to the rotating shaft 1131 of the valve body element 113; wherein, the drive motor 114 drives the valve body element 113 to rotate between a first preset angle and a second preset angle to block or clear the air supply duct 21.

[0052] Specifically, the multi-split air conditioning system also includes a control device, which is electrically connected to the drive motor 114. The drive motor 114 is located on one side of the valve body element 113, and the drive motor 114 has an output shaft corresponding to the valve body element 113. The output shaft is drively connected to the rotating shaft 1131 of the valve body element 113. The control device includes a control panel or remote control, etc., which allows the user to control the drive motor 114 to drive the valve body element 113 to rotate, thereby clearing or blocking the fresh air duct 112.

[0053] In practical applications, when the valve body element 113 is clearing the fresh air duct 112, the drive motor 114 can rotate the valve body element 113 between 5° and 90°. For example, the drive motor 114 can rotate the valve body element 113 to 5°, 30°, 60°, or 90°, so that the opening degree of the corresponding fresh air duct 112 is 5%, 30%, 60%, or 100%. With this setting, the user can adjust the cooling capacity of the corresponding room by adjusting the opening degree of the fresh air duct 112.

[0054] In the above embodiments, the rotating shaft 1131 can be arranged horizontally on the left and right sides of the valve body element 113, in which case the drive motor 114 is arranged on the left or right side of the valve body element 113. Similarly, the rotating shaft 1131 can also be arranged vertically on the upper and lower sides of the valve body element 113, in which case the drive motor 114 is arranged above or below the valve body element 113.

[0055] like Figure 2As shown, in some embodiments, the multi-split air conditioning system further includes a return air box 13 and a return air duct assembly 30. The return air box 13 is connected to the indoor unit 10; the return air duct assembly 30 includes a plurality of return air ducts 31, which are respectively connected to the return air box 13, and each return air duct 31 is provided with at least one return air outlet 32.

[0056] Specifically, the number and shape of the return air ducts 31 can be configured according to the number and location of rooms to ensure that each room has at least one return air vent 32. The return air box 13 is connected to the indoor unit 10 through a duct, and the return air box 13 is connected to multiple return air ducts 31 respectively. In this way, the indoor unit 10 can blow air into the room through the supply air duct 21 and the supply air vent 22, and complete the air circulation through the return air ducts 31 and the return air vent 32.

[0057] like Figure 4 As shown, in some embodiments, a filter assembly 33 is provided at the return air vent 32, and the filter assembly 33 is snapped onto the return air vent 32 by a snap-fit ​​connector.

[0058] Specifically, when the indoor unit 10 is running in recirculation mode, the filter assembly 33 can filter the recirculated air to improve the air quality in the room. At the same time, the filter assembly 33 can be snapped onto the edge of the return air vent 32 using clips or other fasteners to facilitate user installation or removal of the filter assembly 33.

[0059] In some embodiments, a guide hood is also provided at the return air vent 32, and the guide hood is installed on the outside of the filter assembly 33; wherein, the guide hood is snapped onto the return air vent 32 by a snap-fit.

[0060] Specifically, the air guide cover is equipped with multiple air guide grilles. These grilles ensure airflow while preventing debris from entering the return air inlet 32, thereby preventing damage to the return air duct 31 and the filter assembly 33. The air guide cover can be easily attached to the edge of the return air inlet 32 ​​using clips or other fasteners, allowing users to easily remove the air guide cover to install or remove the filter assembly 33.

[0061] like Figure 4 As shown, in some embodiments, the return air vent 32 is configured as a circular structure, and the filter assembly 33 and the air guide hood are both configured as circular structures corresponding to the return air vent 32.

[0062] Specifically, the return air vent 32 is configured with a circular structure, and the filter assembly 33 and the air guide hood are configured with a corresponding circular structure. This reduces the size of the return air vent 32, making it easier for users to install it in locations such as inside a wardrobe.

[0063] like Figure 5As shown, in some embodiments, the multi-split air conditioning system further includes a lighting assembly 40. The lighting assembly 40 is provided corresponding to the return air vent 32 or the supply air vent 22; wherein, the lighting assembly 40 is electrically connected to the indoor unit 10, and the indoor unit 10 can control the operating state of the lighting assembly 40 according to the operating state of the multi-split air conditioning system.

[0064] Specifically, the lighting component 40 is electrically connected to the indoor unit 10. In this way, the control device can adjust the lighting effects of the lighting component 40, such as color temperature or brightness, according to the operating status of the multi-split air conditioning system, to further enhance the user experience. For example, when the multi-split air conditioning system is operating in fresh air mode and the lighting component 40 is located at the air supply vent 22, the control device can control the lighting component 40 at the air supply vent 22 to emit cool white light. When the multi-split air conditioning system is operating in indoor circulation mode and the lighting component 40 is located at the return air vent 32, the control device can control the lighting component 40 at the return air vent 32 to emit a cool-colored breathing light effect.

[0065] When the lighting component 40 is disposed within the air supply vent 22, the size of the lighting component 40 is smaller than the size of the air supply vent 22, so that there is a gap between the lighting component 40 and the side wall of the air supply vent 22, thereby ensuring that air can circulate normally at the air supply vent 22. Similarly, when the lighting component 40 is disposed within the return air vent 32, the size of the lighting component 40 is smaller than the size of the return air vent 32, to ensure that air can circulate normally at the return air vent 32.

[0066] When the lighting component 40 is located on one side of the air supply vent 22, its shape and size correspond to the air supply vent 22. This shape-adaptive integration of the lighting component 40 with the air supply vent 22 solves the problem of high ceiling space occupancy caused by separate installations of the lighting and air conditioning systems in traditional multi-split air conditioning systems, avoids compromising the room's aesthetics, and improves the user experience. Similarly, when the lighting component 40 is located on one side of the return air vent 32, its shape and size correspond to the return air vent 32.

[0067] In some embodiments, the lighting assembly 40 includes a light track and a luminaire. The light track is provided with a mounting groove; the luminaire is mounted in the mounting groove of the light track; wherein the light track is disposed within an air supply vent 22 or an air return vent 32, or the light track is disposed on one side of the air supply vent 22 or the air return vent 32.

[0068] Specifically, when the lighting component 40 is located within the air supply vent 22 or the return air vent 32, the light track 41 can be directly fixed to the bottom wall of the air supply vent 22 or the return air vent 32, leaving a gap around the light track 41. When the lighting component 40 is located on one side of the air supply vent 22 or the return air vent 32, the light track 41 can be fixed to the side wall of the air supply duct 21 or the return air duct 31, or it can be directly fixed to a position in the room corresponding to the air outlet 121 or the return air vent 32. The dimensions of the light track 41 are less than or equal to the dimensions of the air supply duct 21 and the return air duct 31 to prevent the light track 41 from protruding from the air supply duct 21 or the return air duct 31 after installation. The depth of the mounting groove is greater than or equal to the height of the light fixture 42 so that the light fixture 42 can be completely embedded in the mounting groove.

[0069] In the above embodiments, the dimensions of the light track 41 include the height and width of the light track 41, and the dimensions of the air supply duct 21 and the return air duct 31 respectively include the height and width of the air supply duct 21 and the height and width of the return air duct 31.

[0070] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A multi-split air conditioning system, characterized in that, The application relates to a multi-connected air conditioner system, comprising: an indoor unit, comprising a blowing assembly for blowing air to a preset direction; a fresh air system in communication with the indoor unit, the fresh air system being used for conveying fresh air to the indoor unit; and a blowing pipe group comprising a plurality of blowing pipelines, the blowing pipelines being in communication with the blowing assembly respectively, and any blowing pipeline being provided with at least one blowing port; wherein the indoor unit can blow the fresh air conveyed by the fresh air system to the indoor through the blowing pipe group.

2. The multi-split air conditioning system according to claim 1, wherein, The fresh air system comprises: a fresh air machine arranged outdoors; a fresh air pipeline for connecting the fresh air machine and the indoor unit; and a valve element arranged in the fresh air pipeline, the valve element being used for blocking or dredging the fresh air pipeline.

3. The multi-connected air conditioner system according to claim 2, wherein the valve element is configured as a plate body, and the valve element is arranged in the fresh air pipeline through a rotating shaft; wherein the valve element can rotate around the rotating shaft to block or dredge the fresh air pipeline.

4. The multi-split air conditioning system according to claim 3, wherein, Further comprising: a driving motor in transmission connection with the rotating shaft of the valve element; wherein the driving motor drives the valve element to rotate between a first preset angle and a second preset angle to block or dredge the fresh air pipeline.

5. The multi-split air conditioning system according to claim 1, wherein, Further comprising: a return air box arranged in communication with the indoor unit; and a return air pipe group comprising a plurality of return air pipelines, the return air pipelines being in communication with the return air box respectively, and any return air pipeline being provided with at least one return air port.

6. The multi-connected air conditioner system according to claim 5, wherein a filter screen assembly is arranged at the return air port, and the filter screen assembly is clamped at the return air port through a clamping piece.

7. The multi-connected air conditioner system according to claim 6, wherein an air guide cover is further arranged at the return air port, and the air guide cover is installed at the outer side of the filter screen assembly; wherein the air guide cover is clamped at the return air port through a clamping piece.

8. The multi-connected air conditioner system according to claim 7, wherein the return air port is configured as a circular structure, and the filter screen assembly and the air guide cover are both configured as a circular structure corresponding to the return air port. 9.The multi-split air conditioning system according to claim 5, characterized in that, Further comprising: an illumination assembly arranged corresponding to the return air port or the blowing port; wherein the illumination assembly is electrically connected with the indoor unit, and the indoor unit can control the working state of the illumination assembly according to the working state of the multi-connected air conditioner system.

10. The multi-split air conditioning system according to claim 9, wherein, The illumination assembly comprises: a lamp rail provided with a mounting groove; and a lamp installed in the mounting groove of the lamp rail; wherein the lamp rail is arranged in the blowing port or the return air port, or the lamp rail is arranged at one side of the blowing port or the return air port.