Multifunctional fresh air conditioning system

Abstract

The utility model discloses a multi -functional fresh air conditioning system, including compressor, first heat exchanger, second heat exchanger, four -way valve, and the suction port, the exhaust port of compressor are connected with the first mouth, the second mouth of four -way valve respectively, and first heat exchanger, second heat exchanger are connected with the third mouth, the fourth mouth of four -way valve respectively, and second heat exchanger, first heat exchanger connection forms the refrigerant flow path. First air inlet can be communicated with first air outlet or second air outlet respectively to form first air duct or fourth air duct respectively, and second air inlet can be communicated with second air outlet or first air outlet respectively to form second air duct or third air duct respectively, and through the working state (that is open or close) of four air ducts, the position of two heat exchangers and the direction of refrigerant flow path can be respectively corresponding the different function mode of system, make multi -functional fresh air conditioning system have multiple function mode simultaneously, satisfy the specific use demand of different scene and different user.

Description

Technical Field

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

[0002] As living standards and housing conditions improve, people's requirements for air quality in their living environment are also increasing, and their environmental awareness is growing stronger.

[0003] Traditional air conditioning systems typically use a heat pump model, offering both cooling and heating functions, and always include an indoor unit and an outdoor unit. In summer, the indoor unit cools while the outdoor unit releases hot air; in winter, the indoor unit heats while the outdoor unit releases cold air. Traditional air conditioning systems lack a fresh air intake function, leaving the indoor unit in a sealed environment. Long-term use can easily lead to a decline in indoor air quality (such as increased CO2 concentration, odor accumulation, bacterial growth, and other health hazards). Traditional fresh air systems generally only facilitate the convection exchange between exhaust air from indoors and incoming outdoor air; or they may incorporate a heat exchanger in the exchange channel to cool the flowing air. However, this only achieves a simple heat exchange function, offering limited functionality and failing to meet the needs of various usage scenarios.

[0004] Therefore, it is necessary to invent a new air conditioning system with multiple modes that can meet various usage scenarios. Utility Model Content

[0005] In order to overcome the limitations of traditional air conditioning systems and the single functional mode of traditional fresh air systems, which are difficult to meet the needs of multiple scenarios, the present invention provides a multi-functional fresh air conditioning system.

[0006] The technical solution adopted by this utility model to solve its problem is:

[0007] A multi-functional fresh air conditioning system includes a compressor, a first heat exchanger, a second heat exchanger, and a four-way valve. The compressor's intake and exhaust ports are connected to the first and second ports of the four-way valve, respectively. The first and second heat exchangers are connected to the third and fourth ports of the four-way valve, respectively. The second and first heat exchangers are connected to form a refrigerant flow path. The system also includes a first air inlet and a first air outlet facing the indoor side, and a second air inlet and a second air outlet facing the outdoor side. The first air inlet can be connected to either the first or the second air outlet to form a first or fourth air duct, respectively. The second air inlet can be connected to either the second or the first air outlet to form a second or third air duct, respectively. The first heat exchanger can be located in either the first or the third air duct, and the second heat exchanger can be located in either the second or the fourth air duct.

[0008] In a preferred embodiment, the multi-functional fresh air conditioning system further includes a first throttling element, a second throttling element, and a second heat exchanger. The first throttling element, the second throttling element, and the first heat exchanger are sequentially connected to form a refrigerant flow path.

[0009] In a preferred embodiment, the first throttling element and the second throttling element do not operate simultaneously.

[0010] In a preferred embodiment, the multifunctional fresh air conditioning system further includes a first one-way valve and a second one-way valve, wherein the first one-way valve and the first throttling element are connected in parallel, and the second one-way valve and the second throttling element are connected in parallel; wherein, when the first one-way valve is open and the second one-way valve is closed, the refrigerant flows sequentially through the second heat exchanger, the first one-way valve, the second throttling element, and the first heat exchanger; when the second one-way valve is open and the first one-way valve is closed, the refrigerant flows sequentially through the first heat exchanger, the second one-way valve, the first throttling element, and the second heat exchanger.

[0011] In a preferred embodiment, the first throttling element and the second throttling element are electronic expansion valves.

[0012] In a preferred embodiment, when the multi-functional fresh air conditioning system is in indoor cold circulation mode, the refrigerant flows from the first heat exchanger to the compressor, the first air inlet is connected to the first air outlet, and the first heat exchanger is located in the first air duct.

[0013] In a preferred embodiment, when the multi-functional fresh air conditioning system is in indoor heat circulation mode, the refrigerant flows from the compressor to the first heat exchanger, the first air inlet is connected to the first air outlet, and the first heat exchanger is located in the first air duct.

[0014] In a preferred embodiment, when the multi-functional fresh air conditioning system is in outdoor defrosting circulation mode, the refrigerant flows from the compressor to the second heat exchanger, the second air inlet is connected to the second air outlet, and the second heat exchanger is located in the second air duct.

[0015] In a preferred embodiment, when the multi-functional fresh air conditioning system is in indoor-outdoor fresh air cold circulation mode, the refrigerant flows from the second heat exchanger to the first heat exchanger, the first air inlet is connected to the second air outlet, the second air inlet is connected to the first air outlet, the first heat exchanger is located in the third air duct, and the second heat exchanger is located in the fourth air duct.

[0016] In a preferred embodiment, when the multifunctional fresh air conditioning system is in indoor-outdoor fresh air heat circulation mode, the refrigerant flows from the first heat exchanger to the second heat exchanger, the first air inlet is connected to the second air outlet, the second air inlet is connected to the first air outlet, the first heat exchanger is located in the third air duct, and the second heat exchanger is located in the fourth air duct.

[0017] In summary, the multifunctional fresh air conditioning system provided by this utility model has at least the following technical advantages compared with the prior art:

[0018] 1) In the technical solution of this utility model, the first air inlet of the multi-functional fresh air conditioning system can be connected to the first air outlet or the second air outlet respectively to form the first air duct or the fourth air duct respectively; the second air inlet can be connected to the second air outlet or the first air outlet respectively to form the second air duct or the third air duct respectively; by controlling the working state of the four air ducts (i.e., open or closed), the position of the two heat exchangers and the direction of the refrigerant flow path, the different functional modes of the system can be respectively corresponded, so that the multi-functional fresh air conditioning system can simultaneously have indoor cold circulation mode, indoor hot circulation mode, outdoor defrost circulation mode, indoor and outdoor fresh air cold circulation mode and indoor and outdoor fresh air hot circulation mode, to meet the specific usage needs of different scenarios and different users.

[0019] 2) When the usage scenario is indoor cooling or heating demand, the first air inlet and the first air outlet are connected to form a first air duct. The first heat exchanger is located in the first air duct. By controlling the direction of the refrigerant flow path, the heat exchange mode of the first heat exchanger is controlled, so that the multi-functional fresh air air conditioning system is in indoor cold circulation mode or indoor heat circulation mode.

[0020] 3) When the usage scenario is outdoor heating and defrosting, the second air inlet and the second air outlet are connected to form a second air duct. The second heat exchanger is located in the second air duct and is in cooling and heat exchange mode, so that the multi-functional fresh air air conditioning system is in outdoor defrosting circulation mode.

[0021] 4) When the usage scenario is indoor cooling or heating demand, and it is necessary to improve indoor air quality, the first air inlet and the second air outlet are connected to form a second air duct; the second air inlet and the first air outlet are connected to form a third air duct; the first heat exchanger is located in the third air duct, and the second heat exchanger is located in the fourth air duct; by controlling the direction of the refrigerant flow path, the heat exchange mode of the first heat exchanger is controlled, so that the multi-functional fresh air air conditioning system is in indoor and outdoor fresh air cold circulation mode or indoor and outdoor fresh air hot circulation mode. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the multifunctional fresh air conditioning system of this utility model in indoor cold circulation mode;

[0023] Figure 2 This is a schematic diagram of the structure of the multifunctional fresh air conditioning system of this utility model in the indoor heat circulation mode;

[0024] Figure 3 This is a schematic diagram of the structure of the multifunctional fresh air conditioning system of this utility model in outdoor defrosting circulation mode;

[0025] Figure 4 This is a schematic diagram of the structure of the multifunctional fresh air conditioning system of this utility model in the indoor and outdoor fresh air cooling circulation mode;

[0026] Figure 5 This is a schematic diagram of the structure of the multifunctional fresh air conditioning system of this utility model in the indoor and outdoor fresh air heat circulation mode;

[0027] The meanings of the reference numerals in the attached figures are as follows:

[0028] 1. Compressor;

[0029] 2. First heat exchanger; 21. First air inlet; 22. First air outlet;

[0030] 3. Second heat exchanger; 31. Second air inlet; 32. Second air outlet;

[0031] 4. First throttling element;

[0032] 5. Second throttling element;

[0033] 6. Four-way valve;

[0034] 7. First air duct;

[0035] 8. Second air duct;

[0036] 9. Third air duct;

[0037] 10. Fourth air duct. Detailed Implementation

[0038] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0039] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing 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 this utility model.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0041] See Figures 1-5 As shown, in the technical solution of this utility model, the multi-functional fresh air conditioning system includes a compressor 1, a first heat exchanger 2, a second heat exchanger 3, and a four-way valve 6. The suction port and discharge port of the compressor 1 are respectively connected to the first port (S port) and the second port (D port) of the four-way valve 6. The first heat exchanger 2 and the second heat exchanger 3 are respectively connected to the third port (C port) and the fourth port (E port) of the four-way valve 6. The second heat exchanger 3 and the first heat exchanger 2 are connected through a refrigerant pipe to form a refrigerant flow path. The first heat exchanger 2 is located on the indoor side, and the second heat exchanger 3 is located on the outdoor side.

[0042] The positions of the suction port and discharge port of compressor 1 and the two connection ports of four-way valve 6 are fixed. The positions of the first heat exchanger 2, the second heat exchanger 3 and the two connection ports of four-way valve 6 are also fixed. By controlling the valve core inside four-way valve 6, the connection state of different ports is adjusted, thereby adjusting the refrigerant flow direction of the system and realizing the switching of cooling / heating mode of first heat exchanger 2 and second heat exchanger 3.

[0043] Specifically, the first heat exchanger 2 and the second heat exchanger 3 can be designed as separate units or as an integrated unit. When designed as separate units, the first heat exchanger 2 and the second heat exchanger 3 are independent modules, respectively located on the indoor and outdoor sides, and connected to each other via a relatively long refrigerant pipe. When designed as an integrated unit, the first heat exchanger 2 and the second heat exchanger 3 are combined modules, which can be integrated at the boundary between the indoor and outdoor sides (e.g., embedded in a wall). In this case, the first heat exchanger 2 and the second heat exchanger 3 are located on the inner and outer sides of this boundary (the first heat exchanger 2 is located on the indoor side, and the second heat exchanger 3 is located on the outdoor side), and connected to each other via a shorter refrigerant pipe.

[0044] The multi-functional fresh air conditioning system also includes a first air inlet 21 and a first air outlet 22 facing the indoor side, and a second air inlet 31 and a second air outlet 32 ​​facing the outdoor side. The first air inlet 21 and the first air outlet 22 can form a first air duct 7; the first air inlet 21 can be connected to the second air outlet 32 ​​to form a fourth air duct 10; the second air inlet 31 and the second air outlet 32 ​​can form a second air duct 8; and the second air inlet 31 can be connected to the first air outlet 22 to form a third air duct 9.

[0045] Specifically, when the first air duct 7 is formed, indoor air can enter the first air duct 7 through the first air inlet 21 and then be discharged through the first air outlet 22, realizing the internal circulation of indoor air. At this time, the first heat exchanger 2 can be located in the first air duct 7 to exchange heat with the air flowing in the first air duct 7, thereby realizing the cooling or heating function of the indoor air.

[0046] When the second air duct 8 is formed, outdoor air can enter the second air duct 8 through the second air inlet 31 and then be discharged through the second air outlet 32, realizing the external circulation of outdoor air. At this time, the second heat exchanger 3 can be located in the second air duct 8 to exchange heat with the air flowing in the second air duct 8, thereby realizing the heating function of the outdoor air.

[0047] When the third air duct 9 and the fourth air duct 10 are formed, indoor air can enter the fourth air duct 10 through the first air inlet 21 and then be discharged through the second air outlet 32, thereby expelling stale indoor air to the outside. Outdoor air can enter the third air duct 9 through the second air inlet 31 and then be discharged through the first air outlet 22, thereby introducing fresh outdoor air into the room and ultimately meeting the room's fresh air requirements. At this time, the first heat exchanger 2 can be located in the third air duct 9 to provide cooling or heating for the outdoor air flowing into the room, and the second heat exchanger 3 can be located in the fourth air duct 10 to provide cooling or heating for the indoor air flowing into the outdoor air.

[0048] Based on the above structural design, the multifunctional fresh air conditioning system of this utility model can control the working status (i.e., open or closed) of the first air duct 7, the second air duct 8, the third air duct 9 and the fourth air duct 10, and the positions of the first heat exchanger 2 and the second heat exchanger 3 in different air ducts and the direction of the refrigerant flow path to correspond to different functional modes. This allows the multifunctional fresh air conditioning system to simultaneously have indoor cold circulation mode, indoor hot circulation mode, outdoor defrost circulation mode, indoor and outdoor fresh air cold circulation mode and indoor and outdoor fresh air hot circulation mode, so as to meet the specific usage needs of different scenarios and different users.

[0049] It is worth mentioning that the first air inlet 21 and the first air outlet 22 face the indoor side. Specifically, the first air inlet 21 and the first air outlet 22 can be directly connected to the indoor air, or they can be indirectly connected to the indoor air through a duct. Similarly, the second air inlet 31 and the second air outlet 32 ​​face the outdoor side. Specifically, the second air inlet 31 and the second air outlet 32 ​​can be directly connected to the outdoor air, or they can be indirectly connected to the outdoor air through a duct.

[0050] More specifically, in the fresh air conditioning unit corresponding to the multi-functional fresh air conditioning system, the positions of the first heat exchanger 2 and the second heat exchanger 3 are fixed, and the switching of the four air ducts is adjusted by structures such as air valves, so that the two heat exchangers are located in different air ducts in different modes.

[0051] Example 1

[0052] In a preferred embodiment of this utility model, a system design scheme is provided on how to achieve refrigerant flow paths oriented in different directions.

[0053] See Figures 1-5 As shown, in the technical solution of this embodiment, the multi-functional fresh air conditioning system further includes a first throttling element 4, a second throttling element 5, a second heat exchanger 3, the first throttling element 4, the second throttling element 5, and the first heat exchanger 2 connected in sequence to form a refrigerant flow path, forming part of the multi-functional fresh air conditioning system.

[0054] More specifically, a complete refrigerant flow path includes at least the following:

[0055] 1) Compressor 1 exhaust port → second heat exchanger 3 → second throttling element 5 → first heat exchanger 2 → compressor 1 suction port.

[0056] 2) Compressor 1 exhaust port → first heat exchanger 2 → first throttling element 4 → second heat exchanger 3 → compressor 1 suction port.

[0057] In a preferred embodiment, the first throttling element 4 and the second throttling element 5 do not work simultaneously; that is, when the first throttling element 4 is working, the second throttling element 5 is not working, and when the second throttling element 5 is working, the first throttling element 4 is not working.

[0058] See Figures 1-5 As shown, in another preferred embodiment, the multi-functional fresh air conditioning system further includes a first one-way valve and a second one-way valve, wherein the first one-way valve and the first throttling element 4 are connected in parallel, and the second one-way valve and the second throttling element 5 are connected in parallel.

[0059] When the first check valve is open and the second check valve is closed, the refrigerant flows sequentially through the second heat exchanger 3, the first check valve, the second throttling element 5, and the first heat exchanger 2. At this time, the refrigerant flow path is: compressor 1 discharge port → second heat exchanger 3 → first check valve → second throttling element 5 → first heat exchanger 2 → compressor 1 suction port. The first heat exchanger 2 is used for cooling, and the second heat exchanger 3 is used for heating.

[0060] When the second check valve is open and the first check valve is closed, the refrigerant flows sequentially through the first heat exchanger 2, the second check valve, the first throttling element 4, and the second heat exchanger 3. At this time, the refrigerant flow path is: compressor 1 discharge port → first heat exchanger 2 → second check valve → first throttling element 4 → second heat exchanger 3 → compressor 1 suction port. The second heat exchanger 3 is used for cooling, and the first heat exchanger 2 is used for heating.

[0061] In an alternative embodiment, the first throttling element 4 and the second throttling element 5 are preferably electronic expansion valves.

[0062] Example 2

[0063] In another preferred embodiment of this utility model, a system design scheme is provided on how to put a multifunctional fresh air conditioning system into indoor circulation mode (including indoor cold circulation mode and indoor hot circulation mode).

[0064] See Figure 1 As shown, in the technical solution of this embodiment, when the usage scenario is the indoor cooling demand, the refrigerant flows from the first heat exchanger 2 to the compressor 1. The complete refrigerant flow path is: compressor 1 exhaust port → second heat exchanger 3 (at this time, the second heat exchanger 3 is used as a condenser) → second throttling element 5 → first heat exchanger 2 (at this time, the first heat exchanger 2 is used as an evaporator) → compressor 1 suction port.

[0065] At this time, the first air inlet 21 and the first air outlet 22 are connected, forming a first air duct 7. The first heat exchanger 2 is located in the first air duct 7. The low-temperature refrigerant flowing through the first heat exchanger 2 exchanges heat with the air in the first air duct 7, so that the air finally discharged from the first air outlet 22 is low-temperature air, achieving a cooling effect. The multi-functional fresh air conditioning system is in indoor cold circulation mode.

[0066] See Figure 2 As shown, in the technical solution of this embodiment, when the usage scenario is indoor heating demand, the refrigerant flows from the compressor 1 to the first heat exchanger 2. The complete refrigerant flow path is: compressor 1 exhaust port → first heat exchanger 2 (at this time, the first heat exchanger 2 is used as a condenser) → first throttling element 4 → second heat exchanger 3 (at this time, the second heat exchanger 3 is used as an evaporator) → compressor 1 suction port.

[0067] At this time, the first air inlet 21 is connected to the first air outlet 22, the first heat exchanger 2 is located in the first air duct 7, the high-temperature refrigerant flowing through the first heat exchanger 2 exchanges heat with the air in the first air duct 7, so that the air finally discharged from the first air outlet 22 is high-temperature air, achieving the heating effect, and the multi-functional fresh air conditioning system is in the indoor heat circulation mode.

[0068] Example 3

[0069] In another preferred embodiment of this utility model, a system design scheme is provided on how to put a multifunctional fresh air conditioning system in outdoor circulation mode (i.e., outdoor defrost circulation mode).

[0070] See Figure 3 As shown, in the technical solution of this embodiment, when the usage scenario is the heating and defrosting demand on the outdoor side, the refrigerant flows from the compressor 1 to the second heat exchanger 3. The complete refrigerant flow path is: compressor 1 exhaust port → second heat exchanger 3 (at this time, the second heat exchanger 3 is used as a condenser) → second throttling element 5 → first heat exchanger 2 (at this time, the first heat exchanger 2 is used as an evaporator) → compressor 1 suction port.

[0071] At this time, the second air inlet 31 is connected to the second air outlet 32, and the second heat exchanger 3 is located in the second air duct 8. The high-temperature refrigerant flowing through the second heat exchanger 3 exchanges heat with the air in the second air duct 8, so that the air finally discharged from the second air outlet 32 ​​is high-temperature air, achieving a heating effect and putting the multi-functional fresh air air conditioning system in outdoor defrosting circulation mode, melting the frost layer attached to the heat exchange tube of the second heat exchanger 3.

[0072] Example 4

[0073] In another preferred embodiment of this utility model, a system design scheme is provided on how to make a multifunctional fresh air conditioning system operate in an indoor-outdoor fresh air circulation mode (including an indoor-outdoor fresh air cold circulation mode and an indoor-outdoor fresh air hot circulation mode).

[0074] See Figure 4 As shown, in the technical solution of this embodiment, when the usage scenario is indoor cooling demand and it is necessary to improve indoor air quality, the refrigerant flows from the second heat exchanger 3 to the first heat exchanger 2. The complete refrigerant flow path is: compressor 1 exhaust port → second heat exchanger 3 (at this time, the second heat exchanger 3 is used as a condenser) → second throttling element 5 → first heat exchanger 2 (at this time, the first heat exchanger 2 is used as an evaporator) → compressor 1 suction port.

[0075] At this point, the first air inlet 21 is connected to the second air outlet 32, forming a fourth air duct 10; the second air inlet 31 is connected to the first air outlet 22, forming a third air duct 9; the first heat exchanger 2 is located in the third air duct 9, and the low-temperature refrigerant flowing through the first heat exchanger 2 exchanges heat with the air in the third air duct 9, so that the air finally discharged from the first air outlet 22 is low-temperature air, achieving a cooling effect. The second heat exchanger 3 is located in the fourth air duct 10, and the high-temperature refrigerant flowing through the second heat exchanger 3 exchanges heat with the air in the fourth air duct 10, so that the air finally discharged from the second air outlet 32 ​​is high-temperature air, achieving a heating effect. Finally, the multi-functional fresh air conditioning system is in indoor and outdoor fresh air cold circulation mode.

[0076] See Figure 5 As shown, in the technical solution of this embodiment, when the usage scenario is indoor heating demand and it is necessary to improve indoor air quality, the refrigerant flows from the first heat exchanger 2 to the second heat exchanger 3. The complete refrigerant flow path is: compressor 1 exhaust port → first heat exchanger 2 (at this time, the first heat exchanger 2 is used as a condenser) → first throttling element 4 → second heat exchanger 3 (at this time, the second heat exchanger 3 is used as an evaporator) → compressor 1 suction port.

[0077] At this point, the first air inlet 21 is connected to the second air outlet 32, forming a fourth air duct 10; the second air inlet 31 is connected to the first air outlet 22, forming a third air duct 9; the first heat exchanger 2 is located in the third air duct 9, and the high-temperature refrigerant flowing through the first heat exchanger 2 exchanges heat with the air in the third air duct 9, so that the air finally discharged from the first air outlet 22 is high-temperature air, achieving a heating effect. The second heat exchanger 3 is located in the fourth air duct 10, and the low-temperature refrigerant flowing through the second heat exchanger 3 exchanges heat with the air in the fourth air duct 10, so that the air finally discharged from the second air outlet 32 ​​is low-temperature air, achieving a cooling effect. Finally, the multi-functional fresh air conditioning system is in indoor and outdoor fresh air heat circulation mode.

[0078] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A multi-functional fresh air conditioning system, characterized in that, The system includes a compressor, a first heat exchanger, a second heat exchanger, and a four-way valve. The compressor's intake and exhaust ports are connected to the first and second ports of the four-way valve, respectively. The first and second heat exchangers are connected to the third and fourth ports of the four-way valve, respectively. The second and first heat exchangers are connected to form a refrigerant flow path. The system also includes a first air inlet and a first air outlet facing the indoor side, and a second air inlet and a second air outlet facing the outdoor side. The first air inlet can be connected to either the first or the second air outlet to form a first or fourth air duct, respectively. The second air inlet can be connected to either the second or the first air outlet to form a second or third air duct, respectively. The first heat exchanger can be located in either the first or the third air duct, and the second heat exchanger can be located in either the second or the fourth air duct.

2. The multifunctional fresh air conditioning system according to claim 1, characterized in that, The multi-functional fresh air conditioning system also includes a first throttling element, a second throttling element, a second heat exchanger, the first throttling element, the second throttling element, and the first heat exchanger connected in sequence to form a refrigerant flow path.

3. The multifunctional fresh air conditioning system according to claim 2, characterized in that, The first throttling element and the second throttling element do not operate simultaneously.

4. The multifunctional fresh air conditioning system according to claim 3, characterized in that, The multi-functional fresh air conditioning system further includes a first one-way valve and a second one-way valve. The first one-way valve and the first throttling element are connected in parallel, and the second one-way valve and the second throttling element are connected in parallel. When the first one-way valve is open and the second one-way valve is closed, the refrigerant flows sequentially through the second heat exchanger, the first one-way valve, the second throttling element, and the first heat exchanger. When the second one-way valve is open and the first one-way valve is closed, the refrigerant flows sequentially through the first heat exchanger, the second one-way valve, the first throttling element, and the second heat exchanger.

5. The multifunctional fresh air conditioning system according to any one of claims 2-4, characterized in that, The first throttling element and the second throttling element are electronic expansion valves.

6. The multifunctional fresh air conditioning system according to claim 1, characterized in that, When the multi-functional fresh air conditioning system is in indoor cold circulation mode, the refrigerant flows from the first heat exchanger to the compressor, the first air inlet is connected to the first air outlet, and the first heat exchanger is located in the first air duct.

7. The multifunctional fresh air conditioning system according to claim 1, characterized in that, When the multi-functional fresh air conditioning system is in indoor heat circulation mode, the refrigerant flows from the compressor to the first heat exchanger, the first air inlet is connected to the first air outlet, and the first heat exchanger is located in the first air duct.

8. The multifunctional fresh air conditioning system according to claim 1, characterized in that, When the multi-functional fresh air conditioning system is in outdoor defrost circulation mode, the refrigerant flows from the compressor to the second heat exchanger, the second air inlet is connected to the second air outlet, and the second heat exchanger is located in the second air duct.

9. The multifunctional fresh air conditioning system according to claim 1, characterized in that, When the multi-functional fresh air conditioning system is in the indoor and outdoor fresh air cold circulation mode, the refrigerant flows from the second heat exchanger to the first heat exchanger. The first air inlet is connected to the second air outlet, the second air inlet is connected to the first air outlet, the first heat exchanger is located in the third air duct, and the second heat exchanger is located in the fourth air duct.

10. The multifunctional fresh air conditioning system according to claim 1, characterized in that, When the multi-functional fresh air conditioning system is in the indoor and outdoor fresh air heat circulation mode, the refrigerant flows from the first heat exchanger to the second heat exchanger. The first air inlet is connected to the second air outlet, the second air inlet is connected to the first air outlet, the first heat exchanger is located in the third air duct, and the second heat exchanger is located in the fourth air duct.

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