Air conditioning system

Abstract

The air-conditioning system comprises an air-conditioning host and an air supply pipeline air valve assembly, the air-conditioning host is used for carrying out heat exchange on indoor or outdoor air and outputting processed air, the air supply pipeline is communicated with the air-conditioning host and is provided with an outdoor section and an indoor section which are sequentially connected and communicated, the outdoor section is provided with an outdoor opening, and the indoor section is provided with an indoor opening. The outdoor opening is used for communicating the interior and the exterior of the outdoor section, the air valve assembly is arranged in the outdoor section and located on the side, close to the indoor section, of the outdoor opening, when the air valve assembly is in the first state, the outdoor opening is blocked, and when the air valve assembly is in the second state, the outdoor opening is in the open state; the outdoor section, close to one side of the indoor section, of the outdoor opening is blocked. According to the utility model, the refrigerant can enter outdoors from the outdoor opening when the refrigerant leaks, so that the leaked refrigerant cannot enter indoors, and the potential safety hazard possibly caused by the leakage of the refrigerant is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning equipment, in particular to an air-conditioning system. Background Art

[0002] In large buildings such as office buildings and shopping malls, integrated air supply air conditioners (such as window units and rooftop units) are usually used to regulate the indoor temperature. That is, the air outlet of the heat exchanger is generally connected to the indoor room through an air supply duct, and the gas heated by the heat exchanger is transported to the indoor room through the air supply duct. Thanks to this solution, a single integrated air supply air conditioner can be used to regulate the room temperature of multiple rooms.

[0003] However, the evaporator or condenser of the existing integrated air supply air conditioner generally uses flammable and explosive refrigerants. Therefore, when the evaporator leaks, the refrigerant is likely to follow the gas in the air supply duct into the room, causing safety problems. Utility Model Content

[0004] The main purpose of the embodiment of the utility model is to provide an air-conditioning system, aiming to improve the technical problem of the existing integrated air-supply air-conditioning system in which the refrigerant easily leaks into the room.

[0005] An embodiment of the present invention provides an air conditioning system, comprising:

[0006] Air conditioning host, used for heat exchange of indoor air;

[0007] an air supply duct, connected to the air conditioner main unit, having an outdoor section and an indoor section connected and connected in sequence, the air supply duct being used to deliver air treated by the air conditioner main unit to the indoor room, the outdoor section being provided with an outdoor opening, the outdoor opening being used to connect the interior and exterior of the outdoor section;

[0008] The air valve assembly is arranged in the outdoor section, and the air valve assembly is located on the side of the outdoor opening close to the indoor section. The air valve assembly has a first state and a second state that can be switched with each other. When the air valve assembly is in the first state, the outdoor opening is blocked. When the air valve assembly is in the second state, the outdoor opening is in an open state, and the pipe section of the outdoor section located on the side of the outdoor opening close to the indoor section is blocked.

[0009] In some embodiments of the present invention, the damper assembly includes a baffle and a driving member, wherein the driving member and the baffle are disposed inside the outdoor section, and the driving member is used to drive the baffle to move between a first position and a second position;

[0010] When the baffle is in the first position, the baffle covers the outdoor opening to block the outdoor opening;

[0011] When the baffle is in the second position, the baffle blocks the outdoor section, so that the outdoor section is isolated from the indoor section.

[0012] In some embodiments of the present invention, the air-conditioning system also includes a return air duct, which is used to transport indoor air to the air-conditioning host. The air-conditioning host has a first return air port and a first air outlet. The return air duct is connected to the first return air port, and the supply air duct is connected to the first air outlet.

[0013] In some embodiments of the present invention, the air-conditioning system further includes a fresh air fan, which is connected to a fresh air duct for conveying fresh air. The air-conditioning host further includes a fresh air inlet, and the fresh air duct is connected to the fresh air inlet.

[0014] In some embodiments of the present invention, the air-conditioning system further includes a fresh air fan, the fresh air fan is connected to a fresh air duct for conveying fresh air, and an outlet end of the fresh air duct is connected to the return air duct.

[0015] In some embodiments of the present invention, the air-conditioning system also includes a fresh air fan and a return air duct, the fresh air fan is connected to a fresh air duct for conveying fresh air, the air-conditioning main unit has a first return air port and a first air outlet, the return air duct is connected to the indoor air inlet of the fresh air fan, the fresh air duct is connected to the first return air port, and the supply air duct is connected to the first air outlet.

[0016] In some embodiments of the present invention, the air conditioning system further includes a fresh air fan and a return air duct, the fresh air fan is connected to a fresh air duct for conveying fresh air, the air conditioning main unit has a first return air port and a first air outlet, the fresh air duct is connected to the first return air port, and the air supply duct is connected to the first air outlet;

[0017] The outlet end of the return air duct has a first branch and a second branch, the first branch is connected to the indoor air inlet of the fresh air fan, and the second branch is connected to the first return air outlet, and the first branch and the second branch can be opened and closed separately.

[0018] In some embodiments of the present invention, a first valve is provided on the first branch, and the first valve is used to control the opening and closing of the first branch. A second valve is provided on the second branch, and the second valve is used to open and close the second branch.

[0019] In some embodiments of the present utility model, the air-conditioning main unit includes a compressor, a first heat exchanger, a second heat exchanger and a four-way valve, the exhaust port of the compressor is connected to the first valve port of the four-way valve, the second heat exchanger is connected to the second valve port of the four-way valve, the first heat exchanger is connected to the third valve port of the four-way valve, the return air port of the compressor is connected to the fourth valve port of the four-way valve, and the air outlet of the first heat exchanger is connected to the air supply duct.

[0020] In some embodiments of the present invention, the air-conditioning system further includes a controller and a refrigerant concentration sensor, the refrigerant concentration sensor is connected to the controller, and the air valve assembly is connected to the controller, and the controller is used to control the air valve assembly to switch between the first state and the second state according to monitoring information of the refrigerant concentration sensor.

[0021] An embodiment of the present utility model provides an air-conditioning system, which connects the interior and exterior of the outdoor section of the air supply duct by arranging an outdoor opening on the outdoor section, and arranging an air valve assembly in the outdoor section of the air supply duct to control the air valve assembly to switch between a first state and a second state, so that the air supply duct can normally transport air to the room when the air-conditioning main unit is operating normally, and when a refrigerant leak occurs in the air-conditioning main unit, the leaked refrigerant enters the outdoor environment from the outdoor opening, ensuring that the leaked refrigerant cannot enter the room, thereby eliminating the safety hazards that may be caused by the refrigerant leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 This is a structural diagram of an air conditioning system according to an embodiment of the present utility model when the air valve is in a first state;

[0024] Figure 2 This is a structural schematic diagram of an air conditioning system according to an embodiment of the present invention when the air valve is in the second state;

[0025] Figure 3 This is a structural diagram of an air conditioning system according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic structural diagram of an air conditioning system according to a second embodiment of the present invention;

[0027] Figure 5This is a schematic structural diagram of an air conditioning system according to a third embodiment of the present invention;

[0028] Figure 6 This is a structural diagram of an air-conditioning system according to a third embodiment of the present invention.

[0029] Figure numerals: 100, air conditioner main unit; 200, air supply duct; 201, outdoor opening; 210, outdoor section; 220, indoor section; 300, air valve assembly; 310, baffle; 320, driving part; 400, return air duct; 410, first branch; 420. Second branch; 500, fresh air fan; 510, fresh air duct; 600, refrigerant concentration sensor. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] like Figures 1-6 As shown, the present invention provides an air conditioning system, which includes an air conditioning unit 100, an air supply duct 200, and a damper assembly 300. The air conditioning unit 100 is used to exchange heat between indoor and outdoor air. The air supply duct 200 is connected to the air conditioning unit 100 and has an outdoor section 210 and an indoor section 220 that are sequentially connected and communicated. The air supply duct 200 is used to transport air treated by the air conditioning unit 100 to the indoor room. The outdoor section 210 is provided with an outdoor opening 201, which is used to connect the interior and exterior of the outdoor section 210. The damper assembly 300 is disposed in the outdoor section 210 and is located on the side of the outdoor opening 201 that is close to the indoor section 220. The damper assembly 300 has a first state and a second state that are switchable between them. When the damper assembly 300 is in the first state, the outdoor opening 201 is blocked. When the damper assembly 300 is in the second state, the outdoor opening 201 is open, and the section of the outdoor section located on the side of the outdoor opening 201 that is close to the indoor section 220 is blocked.

[0035] The air conditioner 100 has an indoor heat exchanger (first heat exchanger), which can be located outdoors and is used to heat the indoor or outdoor air before transporting it to the indoor area through the air supply duct 200. Generally, the air conditioner 100 is located outdoors, and outdoor air can enter the air conditioner 100 through the air inlet of the air conditioner 100 for heat exchange, while indoor air can enter the outdoor air conditioner 100 through the duct from the indoor area for heat exchange.

[0036] Among them, the outdoor section 210 of the air supply duct 200 is located outdoors, and the indoor section 220 is located indoors. The two are generally formed as one piece, and can also be separately arranged and connected into one piece by means of threaded connection or the like when in use.

[0037] Among them, the outdoor opening 201 is an opening opened on the pipe wall of the outdoor section 210, which connects the inside and outside of the outdoor section 210. The air valve assembly 300 is arranged on the inner wall of the outdoor section 210 and close to the outdoor opening 201 so as to completely block the outdoor opening 201.

[0038] When the outdoor section located on the side of the outdoor opening 201 close to the indoor section 220 is blocked and the outdoor opening 201 is in an open state, the airflow flowing from the air conditioner main unit 100 into the outdoor section 210 is discharged into the outdoor environment through the outdoor opening 201.

[0039] Based on the above description, it can be understood that by controlling the air valve assembly 300 to switch between the first state and the second state, the air supply duct 200 can normally transport air to the room when the air-conditioning host 100 is working normally, and when a refrigerant leak occurs in the air-conditioning host 100, the leaked refrigerant enters the outdoor environment from the outdoor opening 201, ensuring that the leaked refrigerant cannot enter the room, thereby eliminating the safety hazards that may be caused by refrigerant leakage.

[0040] In some embodiments, the air valve assembly 300 includes a baffle 310 and a driving member 320. The driving member 320 and the baffle 310 are arranged inside the outdoor section 210. The driving member 320 is used to drive the baffle 310 to move between a first position and a second position. When the baffle 310 is in the first position, the baffle 310 covers the outdoor opening 201 and blocks the outdoor opening 201. When the baffle 310 is in the second position, the baffle 310 blocks the outdoor section 210 so that the outdoor section 210 and the indoor section 220 are isolated and connected.

[0041] Specifically, the baffle 310 has the same cross-street shape and size as the outdoor section 210, so that the baffle 310 can completely block the outdoor section 210, and at the same time make the opening area of the outdoor opening 201 smaller than the area of the baffle 310 to ensure that the baffle 310 can completely block the outdoor opening 201.

[0042] Specifically, the driving member 320 and the baffle 310 are both arranged on the side of the outdoor opening 201 close to the indoor section 220 to ensure that when the baffle 310 is rotated to the second position, it can block the outdoor section 210 on the side of the outdoor opening 201 close to the indoor section 220, and make the second outdoor section 210 on the side of the outdoor opening 201 close to the air-conditioning host 100 communicate with the external environment through the outdoor opening 201.

[0043] Specifically, when the baffle 310 is in the first position, the baffle 310 is parallel to the axis of the air supply duct 200, so as to fit the surface of the air supply duct 200 and close the outdoor opening 201; when the baffle 310 is in the second position, the baffle 310 is perpendicular to the axis of the air supply duct 200, so as to cut off the air supply duct 200 and block the air supply duct 200.

[0044] In some embodiments, the driving member 320 is a motor.

[0045] like Figure 3 In some embodiments shown, the air conditioning system further includes a return air duct 400, which is used to transport indoor air to the air conditioning host 100. The air conditioning host 100 has a first return air inlet and a first air outlet, the return air duct is connected to the first return air inlet, and the supply air duct 200 is connected to the first air outlet.

[0046] That is, the indoor air is transported to the air conditioner main unit 100 through the return air duct 400 , processed by the air conditioner main unit 100 , and then transported into the room through the supply air duct 200 .

[0047] like Figure 3 As shown, in some embodiments, the air conditioning system further includes a fresh air fan 500, which is connected to a fresh air duct 510 for conveying fresh air. The air conditioning host 100 also has a fresh air inlet, and the fresh air duct 510 is connected to the fresh air inlet.

[0048] The fresh air blower 500 has a fresh air function and can also perform processes such as disinfection, humidification, heating, and negative ionization on the air entering the fresh air blower 500. The fresh air blower 500 can process the air entering the fresh air blower, and then the air is transported to the indoor room after heat exchange by the air conditioner main unit 100. That is, the indoor return air enters the air conditioner main unit 100 through the first return air vent and enters the fresh air blower 500 through the fresh air inlet.

[0049] Among them, the fresh air duct 510 and the return air duct 400 can be opened or closed at the same time, or can be opened and closed separately, which can be determined according to actual usage requirements.

[0050] like Figure 1 As shown, in some embodiments, the air conditioning system further includes a fresh air fan 500 , and the outlet end of the fresh air duct 510 is connected to the return air duct 400 .

[0051] That is, the outlet end of the fresh air duct 510 is used to flow out the air processed by the fresh air blower 500, and the outlet end of the fresh air duct 510 is connected to the return air duct 400, and can deliver fresh air to the air-conditioning main unit 100 through the return air duct 400, and can also deliver air to the room through the return air duct 400. That is, when the air valve assembly 300 is in the second state, air can be delivered to the room through the return air duct 400 to dilute the refrigerant concentration in the room. Specifically, the working modes of the air-conditioning system include: the air-conditioning main unit 100 receives the fresh air from the fresh air blower 500 and the return air from the room at the same time through the first return air port, or can receive the fresh air from the fresh air blower 500 alone, or receive the return air from the room alone, both of which enter the air-conditioning main unit 100 through the first return air port.

[0052] like Figure 4 As shown, in some embodiments, the air-conditioning system also includes a fresh air fan 500 and a return air duct 400, the fresh air fan 500 is connected to a fresh air duct 510 for conveying fresh air, the air-conditioning host 100 has a first return air port and a first air outlet, the return air duct 400 is connected to the indoor air inlet of the fresh air fan 500, the fresh air duct 510 is connected to the first return air port, and the supply air duct 200 is connected to the first air outlet.

[0053] That is, by connecting the return air duct 400 to the indoor air inlet of the fresh air fan 500, the old air in the room can be processed by the fresh air fan 500, and then converted into fresh air of suitable temperature after heat exchange by the air-conditioning host 100 and transported to the room.

[0054] like Figure 5 As shown, in some embodiments, the air conditioning system further includes a fresh air blower 500 and a return air duct 400. The fresh air blower 500 is connected to a fresh air duct 510 for conveying fresh air. The air conditioning main unit 100 has a first return air inlet and a first air outlet. The fresh air duct 510 is connected to the first return air inlet, and the supply air duct 200 is connected to the first air outlet. The outlet end of the return air duct 400 has a first branch 410 and a second branch 420. The first branch 410 is connected to the indoor air inlet of the fresh air blower 500, and the second branch 420 is connected to the first return air inlet. The first branch 410 and the second branch 420 can be opened and closed independently.

[0055] That is, either the first branch 410 or the second branch 420 can be opened individually, or the first branch 410 and the second branch 420 can be opened simultaneously.

[0056] It can be understood that the fresh air fan 500 has a fresh air function and can also disinfect, humidify, heat, and negatively ionize the air entering the fresh air fan 500. By setting the first branch 410 and the second branch 420 at the outlet end of the return air duct 400, and individually controlling the opening and closing of the first branch 410 and the second branch 420, the first branch 410 can be opened alone (the second branch 420 is in a closed state) to transport the old indoor air to the fresh air fan 500 for processing when the outdoor air quality is poor, so as to obtain fresh air of better quality and reduce the processing difficulty of the fresh air fan 500; the second branch 420 can also be opened alone (the first branch 410 is in a closed state) to directly send the old air into the air-conditioning host 100 to ensure the air outlet efficiency of the air-conditioning system.

[0057] In some embodiments, a first valve is provided on the first branch 410 , and the first valve is used to control the opening and closing of the first branch 410 . A second valve is provided on the second branch 420 , and the second valve is used to open and close the second branch 420 .

[0058] It can be understood that the first valve and the second valve can be used to send all the old air in the room into the fresh air fan 500 to ensure that the room has a better air quality, such as when the first branch 410 is opened, the second branch 420 is closed; it can also be achieved that all the indoor air is directly delivered to the air-conditioning host 100 to ensure the indoor heating or cooling efficiency, such as when the first branch 410 is closed, the second branch 420 is opened.

[0059] In some embodiments, the air conditioning host also includes a compressor, a first heat exchanger, a second heat exchanger and a four-way valve, the exhaust port of the compressor is connected to the first valve port of the four-way valve, the refrigerant inlet of the second heat exchanger is connected to the second valve port of the four-way valve, the second heat exchanger is connected to the first heat exchanger, the first heat exchanger is connected to the third valve port of the four-way valve, the return air port of the compressor is connected to the fourth valve port of the four-way valve, and the air outlet of the first heat exchanger is connected to the air supply duct.

[0060] That is, the refrigerant in the air conditioning system can be reversed by the four-way valve, so that it has both heating and cooling functions. The first heat exchanger is the indoor heat exchanger, and the second heat exchanger is the outdoor heat exchanger.

[0061] In some embodiments, the air conditioning system also includes a controller and a refrigerant concentration sensor 600. The refrigerant concentration sensor 600 is connected to the controller, and the air valve assembly 300 is connected to the controller. The controller is used to receive monitoring information from the refrigerant concentration sensor 600. The controller is also used to control the air valve assembly 300 to switch between the first state and the second state, wherein the refrigerant concentration sensor 600 is set indoors.

[0062] Specifically, the control is used to control the damper assembly 300 to switch between the first state and the second state based on the monitoring information of the refrigerant concentration sensor 600. For example, when the indoor refrigerant concentration in the monitoring information of the refrigerant concentration sensor 600 is greater than the first preset concentration, the damper assembly 300 is placed in the second state to prevent the refrigerant from continuing to enter the room.

[0063] In some embodiments, the fresh air fan 500 has a fresh air duct 510 for conveying fresh air, the air conditioning host 100 has a first return air port and a first air outlet, the return air duct 400 is connected to the first return air port, the supply air duct 200 is connected to the first air outlet, the outlet end of the fresh air duct 510 is connected to the return air duct 400, and the outlet end of the fresh air duct 510 is also connected to the first return air port.

[0064] Specifically, when the controller detects that the indoor refrigerant concentration is greater than the second preset concentration, in addition to placing the damper assembly 300 in the second state, the controller also controls the fresh air blower 500 to deliver fresh air into the room through the return air duct 400 to dilute the indoor refrigerant concentration. When the refrigerant concentration is lower than the second preset concentration and greater than the first preset concentration, only the damper assembly 300 is placed in the second state.

[0065] In some embodiments, the air conditioner main unit 100 is also provided with a refrigerant concentration sensor 600, and the controller is further configured to control the damper assembly 300 to switch between the first state and the second state based on the monitoring information of the refrigerant concentration sensor 600 in the air conditioner main unit 100. Specifically, if the refrigerant concentration sensor 600 in the air conditioner main unit 100 detects a concentration greater than a preset value, the controller determines that the air conditioner main unit 100 is in a leaking state and controls the damper assembly 300 to switch to the second state to prevent refrigerant from entering the room.

[0066] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the application concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that: include: Air conditioning host, used for heat exchange of indoor air; an air supply duct having an outdoor section and an indoor section that are sequentially connected and communicated, the air supply duct being used to deliver air processed by the air conditioner main unit to the indoor space, the outdoor section being provided with an outdoor opening, the outdoor opening being used to communicate the interior and exterior of the outdoor section; The air valve assembly is arranged in the outdoor section, and the air valve assembly is located on the side of the outdoor opening close to the indoor section. The air valve assembly has a first state and a second state that can be switched with each other. When the air valve assembly is in the first state, the outdoor opening is blocked. When the air valve assembly is in the second state, the outdoor opening is in an open state, and the pipe section of the outdoor section located on the side of the outdoor opening close to the indoor section is blocked.

2. The air conditioning system according to claim 1, characterized in that The damper assembly includes a baffle and a driving member, wherein the driving member and the baffle are arranged inside the outdoor section, and the driving member is used to drive the baffle to move between a first position and a second position; When the baffle is in the first position, the baffle covers the outdoor opening to block the outdoor opening; When the baffle is in the second position, the baffle blocks the outdoor section, so that the outdoor section is isolated from the indoor section.

3. The air conditioning system according to claim 2, characterized in that The air conditioning system also includes a return air duct, which is used to transport indoor air to the air conditioning host. The air conditioning host has a first return air port and a first air outlet. The return air duct is connected to the first return air port, and the supply air duct is connected to the first air outlet.

4. The air conditioning system according to claim 3, characterized in that The air conditioning system further comprises a fresh air blower, the fresh air blower is connected to a fresh air duct for conveying fresh air, the air conditioning host further comprises a fresh air inlet, and the fresh air duct is connected to the fresh air inlet.

5. The air conditioning system according to claim 3, characterized in that The air conditioning system further comprises a fresh air fan, which is connected to a fresh air duct for conveying fresh air, and an outlet end of the fresh air duct is in communication with the return air duct.

6. The air conditioning system according to claim 1, characterized in that The air-conditioning system also includes a fresh air fan and a return air duct. The fresh air fan is connected to a fresh air duct for conveying fresh air. The air-conditioning main unit has a first return air port and a first air outlet. The return air duct is connected to the indoor air inlet of the fresh air fan, the fresh air duct is connected to the first return air port, and the supply air duct is connected to the first air outlet.

7. The air conditioning system according to claim 1, characterized in that The air conditioning system further includes a fresh air fan and a return air duct, the fresh air fan is connected to a fresh air duct for conveying fresh air, the air conditioning main unit has a first return air port and a first air outlet, the fresh air duct is connected to the first return air port, and the air supply duct is connected to the first air outlet; The outlet end of the return air duct has a first branch and a second branch, the first branch is connected to the indoor air inlet of the fresh air fan, and the second branch is connected to the first return air outlet, and the first branch and the second branch can be opened and closed separately.

8. The air conditioning system according to claim 7, characterized in that The first branch is provided with a first valve, and the first valve is used to control the opening and closing of the first branch. The second branch is provided with a second valve, and the second valve is used to open and close the second branch.

9. The air conditioning system according to claim 1, characterized in that The air conditioner main unit includes a compressor, a first heat exchanger, a second heat exchanger and a four-way valve, the exhaust port of the compressor is connected to the first valve port of the four-way valve, the second heat exchanger is connected to the second valve port of the four-way valve, the first heat exchanger is connected to the third valve port of the four-way valve, and the return air port of the compressor is connected to the fourth valve port of the four-way valve; The air outlet of the first heat exchanger is communicated with the air supply duct.

10. The air conditioning system according to any one of claims 1 to 9, characterized in that: The air-conditioning system also includes a controller and a refrigerant concentration sensor. The refrigerant concentration sensor is connected to the controller, and the air valve assembly is connected to the controller. The controller is used to control the air valve assembly to switch between the first state and the second state according to the monitoring information of the refrigerant concentration sensor.

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