A fresh air system

Abstract

The utility model provides a kind of fresh air system, it includes shell, filter device, communicating port, exhaust fan and valve device.The one side of shell is provided with fresh air outlet and exhaust inlet, and the other side of shell is provided with fresh air inlet and exhaust outlet.New air passage for communicating fresh air inlet and fresh air outlet and exhaust passage for communicating exhaust inlet and exhaust outlet are formed in shell.Filter device is set at fresh air inlet.Communicating port is used to communicate exhaust passage and fresh air passage.Exhaust fan is set in the upstream of communicating port, and exhaust fan is used to transport indoor air from exhaust inlet to exhaust outlet or communicating port.Valve device is configured to: when operating fresh air mode, close communicating port and open exhaust outlet, and when operating self-cleaning mode, open communicating port and close exhaust outlet.The utility model solves the problem that filter device of existing fresh air system is not convenient to clean, and realizes self-cleaning function.

Description

Technical Field

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

[0002] With increasing attention paid to indoor air quality, fresh air systems have become key equipment for improving building ventilation. Among them, two-way fresh air systems have fresh air ducts and exhaust ducts. The fresh air ducts introduce filtered outdoor fresh air into the room, increasing oxygen content and cleanliness, while the exhaust ducts expel stale indoor air, effectively reducing the concentration of harmful gases and substances.

[0003] However, after prolonged operation, the filters are prone to clogging, leading to a significant decrease in airflow and purification efficiency in the fresh air system, and potentially causing increased energy consumption and noise. Furthermore, the ceiling-mounted installation of the fresh air system makes filter removal and replacement extremely inconvenient, resulting in high maintenance costs and long maintenance cycles, causing the equipment to frequently operate inefficiently. Utility Model Content

[0004] In view of the above problems, this utility model is proposed to provide a fresh air system that overcomes or at least partially solves the above problems, and can solve the problem that the filter device of the existing fresh air system is not easy to clean, so that the fresh air system has a self-cleaning function and achieves the purpose of improving the user experience.

[0005] Specifically, this utility model provides a fresh air system, including:

[0006] The housing has a fresh air outlet and an exhaust air inlet on one side, and a fresh air inlet and an exhaust air outlet on the other side; the housing contains a fresh air channel connecting the fresh air inlet and the fresh air outlet, and an exhaust air channel connecting the exhaust air inlet and the exhaust air outlet.

[0007] A filter device is installed at the fresh air inlet;

[0008] A connecting port is used to connect the exhaust duct and the fresh air duct;

[0009] An exhaust fan is located upstream of the connecting port and is used to transport indoor air from the exhaust inlet to the exhaust outlet or the connecting port.

[0010] A valve device is used to close the connection port and open the exhaust outlet when the fresh air system is operating in fresh air mode; and to open the connection port and close the exhaust outlet when the fresh air system is operating in self-cleaning mode.

[0011] Optionally, the connection port is adjacent to the exhaust outlet;

[0012] The valve device includes a first valve, the pivot of which is located at the connection between the communication port and the exhaust outlet, for selectively opening either the communication port or the exhaust outlet.

[0013] Optionally, the valve device includes:

[0014] The second valve is used to close or open the communication port;

[0015] The third valve is used to close or open the exhaust outlet.

[0016] Optionally, the filtration device includes:

[0017] At least two layers of filters, with the mesh size of the filters decreasing sequentially along the direction from the fresh air inlet to the fresh air outlet.

[0018] Optionally, the fresh air system further includes:

[0019] The dust collection trough, located downstream of the indoor airflow direction of the filter device, is used to collect dust that falls off the filter device.

[0020] Optionally, the ash collection trough can be retractably inserted into the fresh air inlet.

[0021] Optionally, the filter screen near the inner side of the housing is a high-efficiency filter screen, and its surface is provided with a bactericidal coating and an anti-allergy coating;

[0022] The antibacterial coating includes silver ions and / or vitamin C.

[0023] Optionally, the fresh air system further includes:

[0024] An air supply damper is used to open the fresh air outlet when operating in fresh air mode and to close the fresh air outlet when operating in self-cleaning mode.

[0025] A blower is used to deliver fresh air from the fresh air inlet to the fresh air outlet;

[0026] The control device is used to control the exhaust fan to operate in a pulse-motion mode when the fresh air system is in self-cleaning mode.

[0027] Optionally, the fresh air system further includes:

[0028] Differential pressure sensors are installed on both sides of the filtration device to obtain the air resistance before and after filtration.

[0029] A heat exchange core is disposed within the housing. The heat exchange core is provided with a first channel for forming part of the fresh air channel and a second channel for forming part of the exhaust air channel. The fresh air inlet and the exhaust air inlet are arranged opposite to each other, and the fresh air outlet and the exhaust air outlet are arranged opposite to each other. The heat exchange core includes antibacterial, anti-mildew, and antiviral materials.

[0030] The sterilization module is installed inside the fresh air duct.

[0031] Optionally, the fresh air system further includes:

[0032] Lifting lugs are provided on the housing;

[0033] A vibration damping layer is provided on the surface of the lug.

[0034] In this novel fresh air system, the addition of a connecting port and valve device allows for switching of airflow paths. The exhaust fan generates a reverse airflow to purge the filter, completely changing the traditional manual disassembly and cleaning method, significantly improving user experience and equipment maintenance convenience. Through regular self-cleaning, the system effectively maintains the permeability of the filter, preventing airflow reduction and increased energy consumption due to filter clogging, ensuring long-term stable and efficient operation and reducing operating costs. Furthermore, the system's overall structure is simple and reliable, requiring no complex mechanisms, resulting in low cost and easy intelligent control. Moreover, by placing the filter at the fresh air inlet, the entire fresh air duct from the filter to the outlet is filled with filtered air, preventing dust accumulation. In self-cleaning mode, dust blown off the filter can be directly discharged through the fresh air inlet along the shortest path, greatly improving dust removal efficiency and cleaning effect.

[0035] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0036] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0037] Figure 1 This is a schematic structural diagram of a fresh air system in fresh air mode according to an embodiment of the present invention;

[0038] Figure 2 This is a schematic structural diagram of a fresh air system in self-cleaning mode according to an embodiment of the present invention;

[0039] Figure 3 This is a schematic structural diagram of the hanging lug in a fresh air system according to an embodiment of the present invention. Detailed Implementation

[0040] The following reference Figures 1 to 3 This description pertains to a fresh air system according to an embodiment of the present invention. In this description, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0041] Unless otherwise expressly specified and limited, the terms "set," "install," "connect," "link," "fix," and "couple" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "below" of the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] Figure 1 This is a schematic structural diagram of a fresh air system in fresh air mode according to an embodiment of the present invention, as shown below. Figure 1 As shown, and refer to Figures 2 to 3 This utility model embodiment provides a fresh air system including a housing 1, a filter device 2, a connecting port 15, an exhaust fan 41, and a valve device.

[0045] A fresh air outlet 12 and an exhaust air inlet 13 are provided on one side of the housing 1, and a fresh air inlet 11 and an exhaust air outlet 14 are provided on the other side of the housing 1. A fresh air duct 16 is formed inside the housing 1 to connect the fresh air inlet 11 and the fresh air outlet 12, and an exhaust air duct 17 to connect the exhaust air inlet 13 and the exhaust air outlet 14. A filter device 2 is provided at the fresh air inlet 11. A connecting port 15 is used to connect the exhaust air duct 17 and the fresh air duct 16. That is, a connecting port 15 is provided between the exhaust air duct 17 and the fresh air duct 16. An exhaust fan 41 is located upstream of the connecting port 15, and the exhaust fan 41 is used to deliver indoor air from the exhaust air inlet 13 to the exhaust air outlet 14 or the connecting port 15. The valve device is configured to: close the connecting port 15 and open the exhaust air outlet 14 when the fresh air system is operating in fresh air mode; and open the connecting port 15 and close the exhaust air outlet 14 when the fresh air system is operating in self-cleaning mode.

[0046] In this embodiment, the fresh air system mainly achieves different airflow paths in "fresh air mode" and "self-cleaning mode" by switching valve devices, thereby completing the functions of ventilation and automatic filter cleaning.

[0047] like Figure 1As shown, the fresh air mode operation is as follows: When the system starts in fresh air mode, the valve device closes the connection port 15 and opens the exhaust outlet 14. Fresh outdoor air enters the housing 1 through the fresh air inlet 11, first passing through the filter device 2, where dust, pollen, and other pollutants are filtered and intercepted. The clean fresh air then flows into the room through the fresh air duct 16 and the fresh air outlet 12, improving indoor air quality. At the same time, stale indoor air is drawn into the housing 1 through the exhaust inlet 13 by the negative pressure of the exhaust fan 41, flowing through the exhaust duct 17. Since the connection port 15 is closed and the exhaust outlet 14 is opened, the stale air is finally discharged to the outside through the exhaust outlet 14. In this mode, the system achieves bidirectional air exchange between indoors and outdoors, and all air entering the room is effectively filtered.

[0048] like Figure 2 As shown, the self-cleaning mode operates as follows: When the system has been running for a certain period or when the differential pressure sensor 6 detects an increase in the resistance of the filter device 2, the self-cleaning mode can be activated. At this time, the valve device opens the connection port 15 and closes the exhaust outlet 14. Simultaneously, the fresh air outlet 12 is closed, and the supply of fresh air to the fresh air duct 16 is stopped. The exhaust fan 41 starts, drawing indoor air in through the exhaust inlet 13, forming an airflow. Since the exhaust outlet 14 is closed, the airflow flows into the fresh air duct 16 through the connection port 15. The airflow then blows in the opposite direction to the fresh air mode, from the inside out, across the filter device 2. This reverse airflow effectively loosens, peels off, and removes dust particles attached to the filter device 2, blowing them outdoors. In this mode, the filter device 2 is automatically cleaned using indoor airflow, eliminating the need for manual disassembly and cleaning by the user, thus restoring the ventilation efficiency of the filter device 2.

[0049] In this embodiment, on the one hand, compared with the prior art, by adding a connection port 15 and a valve device, the fresh air system can switch the airflow path and use the exhaust fan 41 to generate a reverse airflow to purge the filter device 2, completely changing the traditional maintenance method of manually disassembling and cleaning the filter device 2, greatly improving the user experience and the convenience of equipment maintenance. Through regular self-cleaning, the fresh air system can effectively maintain the permeability of the filter device 2, preventing problems such as airflow reduction and increased energy consumption caused by filter clogging, ensuring the long-term stable and efficient operation of the fresh air system, and reducing operating costs. On the other hand, the overall structure of the fresh air system is simple and reliable, without the need for complex mechanisms, and is inexpensive and easy to implement intelligent control.

[0050] On the other hand, by placing the filter device 2 at the fresh air inlet 11, the entire fresh air duct 16 from the filter device 2 to the fresh air outlet 12 is filled with filtered air, and dust does not easily accumulate in the fresh air duct 16. At the same time, in the self-cleaning mode, the dust blown off the filter device 2 can be discharged directly through the fresh air inlet 11 along the shortest path, which greatly improves the dust removal efficiency and cleaning effect.

[0051] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the fresh air system also includes an air supply damper 52 and an air supply fan 42. The air supply damper 52 is used to open the fresh air outlet 12 when operating in fresh air mode and to close the fresh air outlet 12 when operating in self-cleaning mode. The air supply fan 42 is configured to: deliver fresh air from the fresh air inlet 11 to the fresh air outlet 12 when operating in fresh air mode; and not operate when operating in self-cleaning mode.

[0052] Specifically, the air supply valve 52 is a single-channel valve that can control the opening and closing state of the fresh air outlet 12.

[0053] Preferably, the air supply valve 52 and the air supply fan 42 are controlled in a linked manner. That is, upon receiving an instruction to open the air supply fan 42, the air supply valve 52 first fully opens, and then, after a preset delay (e.g., 3 seconds), the air supply fan 42 starts rotating. Simultaneously, upon receiving an instruction to close the air supply fan 42, the air supply fan 42 completely stops, and then, after a preset delay (e.g., 3 seconds), the air supply valve 52 closes. This delayed linkage control method serves two purposes: first, it prevents damage to the air supply fan 42 due to errors causing the air supply valve 52 to not open before the air supply fan 42 has already started operating; second, it prevents abnormal wind noise caused by the air supply fan 42 operating before the air supply valve 52 has fully opened.

[0054] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the fresh air system also includes a heat exchange core 7, which is disposed within the housing 1. The heat exchange core 7 has a first channel forming part of the fresh air duct 16 and a second channel forming part of the exhaust air duct 17; the fresh air inlet 11 and the exhaust air inlet 13 are arranged opposite to each other, and the fresh air outlet 12 and the exhaust air outlet 14 are arranged opposite to each other. The heat exchange core 7 includes antibacterial, antifungal, and antiviral materials. The antibacterial, antifungal, and antiviral materials include, but are not limited to, one or more of the following: metal ion antibacterial agents, photocatalytic materials, and organic antibacterial agents. The antibacterial, antifungal, and antiviral materials are added to the matrix material of the heat exchange core 7, or are applied to the surface of the heat exchange core 7 through a surface coating or impregnation process.

[0055] This antibacterial, anti-mildew, and antiviral material can effectively inhibit the growth and reproduction of microorganisms (mold, viruses, and bacteria) on the surface of the heat exchange core 7, fundamentally eliminating the secondary pollution source caused by dampness and scaling of the core. While improving the safety of indoor air quality, it also extends the service life of the core itself and maintains stable heat exchange efficiency.

[0056] In this embodiment, the heat exchange core 7 can be implemented in any of the following ways: (1) a heat exchange core 7 composed of a paper corrugated skeleton and a composite paper film; (2) a heat exchange core 7 composed of an injection-molded ABS frame and a graphene polymer film; (3) a heat exchange core 7 composed of a PP (polypropylene) hollow sheet frame and a graphene polymer film; (4) a heat exchange core 7 integrally injection molded.

[0057] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the fresh air system also includes a sterilization module 8. The sterilization module 8 is located within the fresh air duct 16 and employs one or more of the following: bipolar ionization, photoplasma, UVC ultraviolet lamp, and photohydrogen ionization.

[0058] Preferably, the sterilization module 8 is located within the fresh air duct 16 near the fresh air outlet 12. Placing the sterilization module at the end of the fresh air duct 16 allows for final sterilization before the air is delivered, ensuring that the fresh air supplied to the room is clean and sterile, effectively reducing the risk of secondary pollution during the air supply process.

[0059] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the connecting port 15 is adjacent to the exhaust outlet 14. The valve device includes a first valve 51, the shaft of which is located at the connection between the connecting port 15 and the exhaust outlet 14, for selectively opening either the connecting port 15 or the exhaust outlet 14.

[0060] That is, the first valve 51 is rotatably mounted on the housing 1. The first valve 51 has a first position and a second position. Figure 1 As shown, when the first valve 51 is in the first position, the connecting port 15 is closed and the exhaust outlet 14 is opened; as Figure 2 As shown, when the first valve 51 is in the second position, the connecting port 15 is opened and the exhaust outlet 14 is closed.

[0061] In this embodiment, the valve device uses a rotatable first valve 51. In fresh air mode, the first valve 51 rotates to the first position, closing the connecting port 15 and simultaneously opening the exhaust outlet 14. At this time, the indoor stale air is normally discharged through the exhaust outlet 14 under the action of the exhaust fan 41. When switching to self-cleaning mode, the first valve 51 rotates to the second position, closing the exhaust outlet 14 and simultaneously opening the connecting port 15. At this time, the airflow generated by the exhaust fan 41 is transferred into the fresh air channel 16 through the connecting port 15, forming a reverse blowing airflow, thereby cleaning the filter device 2.

[0062] In some embodiments of this utility model, the valve device includes a second valve and a third valve, wherein the second valve is used to close or open the communication port 15; and the third valve is used to close or open the exhaust outlet 14.

[0063] In this embodiment, the second valve and the third valve independently control the connection port 15 and the exhaust outlet 14, respectively. In fresh air mode, the second valve closes the connection port 15, while the third valve opens the exhaust outlet 14, allowing the indoor stale air to be discharged normally. In self-cleaning mode, the second valve opens the connection port 15, while the third valve closes, thereby directing the exhaust airflow to the fresh air duct 16, forming a reverse blowing.

[0064] In the two embodiments described above, the embodiment using a single first valve 51 effectively reduces material costs, processing costs, and assembly costs while achieving the same function.

[0065] In some embodiments of this utility model, the filtering device 2 includes a filter screen.

[0066] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the filter device 2 includes at least two layers of filter screens, with the mesh size of the at least two layers of filter screens decreasing sequentially along the direction from the fresh air inlet 11 to the fresh air outlet 12. Specifically, the number of filter screen layers can be two, three, four, or five or more.

[0067] In this embodiment, outdoor fresh air passes sequentially through filters with progressively smaller mesh sizes from the fresh air inlet 11 to the fresh air outlet 12, achieving a step-by-step filtration process from coarse to fine. This gradient filtration effectively improves overall filtration efficiency while significantly extending the lifespan of the subsequent precision filters.

[0068] On the other hand, when the self-cleaning mode is running, small particles blown off by the airflow can pass through the filter with progressively larger mesh size without obstruction, and are finally discharged smoothly from the fresh air inlet 11, thereby significantly improving cleaning efficiency.

[0069] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the filter screen near the outer side of the housing 1 is the pre-filter 21, and the filter screen near the inner side of the housing 1 is the high-efficiency filter 22. The surface of the high-efficiency filter 22 is provided with a bactericidal coating and an anti-allergy coating. The bactericidal coating includes silver ions and / or vitamin C.

[0070] Furthermore, the high-efficiency filter 22 is an H13 high-efficiency filter 22.

[0071] In this embodiment, by setting a bactericidal coating and an anti-allergy coating on the surface of the H13 high-efficiency filter 22, microorganisms can be inactivated and allergens can be decomposed while filtering, thus comprehensively improving the air quality and health protection level of the air outlet.

[0072] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the fresh air system also includes a dust collection trough 3, which is located downstream of the indoor airflow direction of the filter device 2 and is used to collect dust that falls off the filter device 2.

[0073] In self-cleaning mode, after the reverse airflow blows away the dust accumulated on the filter device 2, the dust that falls off moves along the direction of the airflow and is eventually captured and collected by the dust collection trough 3 located on the downstream side.

[0074] In this embodiment, by setting up the dust collection trough 3, the dust generated during the self-cleaning process is effectively collected, reducing the secondary pollution caused by the direct discharge of blown pollutants into the outdoor environment.

[0075] In some embodiments of this utility model, the dust collection trough 3 is removably inserted into the fresh air inlet 11. Specifically, the dust collection trough 3 can be pulled out from the bottom of the fresh air inlet 11 for water washing to clean the dust inside.

[0076] In this embodiment, the pull-out ash collection trough 3 facilitates quick disassembly and cleaning by users, greatly improving the convenience of maintenance operations.

[0077] In some embodiments of this invention, the fresh air system further includes a control device for controlling the exhaust fan 41 to operate in a pulse-interval mode when the fresh air system is in self-cleaning mode. For example, the exhaust fan 41 runs for 20 seconds and stops for 5 seconds, alternating between these pulse-interval operations. In this embodiment, the pulse mode achieves "explosive" cleaning of deep-seated dust through a cycle of "strong blowing—pause—strong blowing again," which is far more effective than continuous and stable airflow.

[0078] In some embodiments of this invention, the fresh air system further includes a differential pressure sensor 6, which is disposed on both sides of the filter device 2 to obtain the air resistance before and after filtration. This embodiment uses the differential pressure sensors 6 disposed on both sides of the filter device 2 to monitor changes in air resistance in real time, thereby determining the filter's clogging status and providing a reliable basis for filter replacement or cleaning.

[0079] In some embodiments of this invention, differential pressure sensors 6 are disposed on both sides of the high-efficiency filter 22. When airflow passes through the high-efficiency filter 22, the sensors can detect the pressure difference across the filter to determine its clogging status. P1 represents the air resistance (pressure) before the filter, P2 represents the air resistance (pressure) after the filter, and P3 is the air resistance setting for filter replacement reminders. Generally, when P2 - P1 > P3, it indicates that the filter needs to be replaced or cleaned. To improve the accuracy of the determination and prevent the influence of measurement errors, the filter is only determined to need replacement or cleaning when P2 - P1 > P3 for three consecutive 24-hour periods.

[0080] This embodiment, by setting a differential pressure sensor 6 and adopting a continuous over-limit judgment mechanism, can accurately and reliably monitor the filter screen's clogging status, effectively avoiding false alarms caused by instantaneous measurement errors.

[0081] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the fresh air system also includes a hanging lug 91. The hanging lug 91 is mounted on the housing 1.

[0082] In some embodiments of this utility model, such as Figure 3 As shown, the fresh air system also includes a vibration damping layer 92. The vibration damping layer 92 is disposed on the surface of the lug 91. In this embodiment, the vibration damping layer 92 can be a damping layer made of rubber, silicone, or thermoplastic elastomer. Alternatively, the vibration damping layer 92 can also be a rubber bushing fitted over the lug 91.

[0083] This embodiment effectively isolates the rigid transmission path of vibration through the lug 91 to the building structure (such as the ceiling) by setting a vibration damping layer 92 on the surface of the lug 91, thereby significantly reducing operating noise.

[0084] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A fresh air system, characterized in that, include: The housing has a fresh air outlet and an exhaust air inlet on one side, and a fresh air inlet and an exhaust air outlet on the other side; the housing contains a fresh air channel connecting the fresh air inlet and the fresh air outlet, and an exhaust air channel connecting the exhaust air inlet and the exhaust air outlet. A filter device is installed at the fresh air inlet; A connecting port is used to connect the exhaust duct and the fresh air duct; An exhaust fan is located upstream of the connecting port and is used to transport indoor air from the exhaust inlet to the exhaust outlet or the connecting port; A valve device is used to close the connection port and open the exhaust outlet when the fresh air system is operating in fresh air mode; and to open the connection port and close the exhaust outlet when the fresh air system is operating in self-cleaning mode.

2. The fresh air system according to claim 1, characterized in that, The connecting port is adjacent to the exhaust outlet; The valve device includes a first valve, the pivot of which is located at the connection between the communication port and the exhaust outlet, for selectively opening either the communication port or the exhaust outlet.

3. The fresh air system according to claim 1, characterized in that, The valve device includes: The second valve is used to close or open the communication port; The third valve is used to close or open the exhaust outlet.

4. The fresh air system according to claim 1, characterized in that, The filtration device includes: At least two layers of filters, with the mesh size of the filters decreasing sequentially along the direction from the fresh air inlet to the fresh air outlet.

5. The fresh air system according to claim 4, characterized in that, Also includes: The dust collection trough, located downstream of the indoor airflow direction of the filter device, is used to collect dust that falls off the filter device.

6. The fresh air system according to claim 5, characterized in that, The ash collection trough can be pulled out and inserted into the fresh air inlet.

7. The fresh air system according to claim 4, characterized in that, The filter screen near the inner side of the housing is a high-efficiency filter screen, and its surface is provided with a bactericidal coating and an anti-allergy coating; The antibacterial coating includes silver ions and / or vitamin C.

8. The fresh air system according to claim 1, characterized in that, Also includes: An air supply damper is used to open the fresh air outlet when operating in fresh air mode and to close the fresh air outlet when operating in self-cleaning mode. A blower is used to deliver fresh air from the fresh air inlet to the fresh air outlet; The control device is used to control the exhaust fan to operate in a pulse-motion mode when the fresh air system is in self-cleaning mode.

9. The fresh air system according to claim 1, characterized in that, Also includes: Differential pressure sensors are installed on both sides of the filtration device to obtain the air resistance before and after filtration. A heat exchange core is disposed within the housing. The heat exchange core is provided with a first channel for forming part of the fresh air channel and a second channel for forming part of the exhaust air channel. The fresh air inlet and the exhaust air inlet are arranged opposite to each other, and the fresh air outlet and the exhaust air outlet are arranged opposite to each other. The heat exchange core includes antibacterial, anti-mildew, and antiviral materials. The sterilization module is installed inside the fresh air duct.

10. The fresh air system according to claim 1, characterized in that, Also includes: Lifting lugs are provided on the housing; A vibration damping layer is provided on the surface of the lug.

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