Anti-backflow air device and fresh air system applying same

Abstract

The utility model discloses an anti-backflow air device, which is applied to a fresh air system and comprises a base assembly, an air inlet and an air outlet, and the base assembly is provided with a base air inlet and a base air outlet which are both communicated with the interior of a room; the separation assembly is provided with a separation air inlet and a separation air outlet; the mixing cavity assembly is arranged on the base assembly, and the mixing cavity assembly is provided with a mixing cavity air inlet and a mixing cavity air outlet; a mixing cavity is formed in the mixing cavity assembly, the mixing cavity assembly is connected to the base assembly, and the partition assembly is located in the mixing cavity; the driving assembly is connected with the separating assembly and used for driving the separating assembly to be switched between the first position and the second position. The partition assembly and the mixing cavity assembly are matched at different positions, so that the air opening is communicated or blocked, pollutants can be prevented from flowing back into a room, small animals can be prevented from entering the room, meanwhile, a fresh air system can be started even under the conditions of bad outdoor environment conditions and the like, and the fresh air system is protected. And internal circulation of indoor air is realized by utilizing the anti-backflow air device.

Description

Technical Field

[0001] This utility model relates to the field of fresh air technology, and in particular to a device for preventing backflow of air and a fresh air system using the same. Background Technology

[0002] Fresh air systems are generally used to introduce filtered outdoor air into the room, while exhausting stale indoor air to the outside, thus achieving air circulation and replacement. However, most existing fresh air systems rely on ductwork to transfer air between the indoor and outdoor environments. They generally lack effective protective structures against potentially harsh outdoor conditions, allowing outdoor odors, dust, and other pollutants to easily flow back into the room through the ductwork. This can even lead to the entry of organisms such as snakes, rats, insects, and ants into the room, severely impacting the user experience. Furthermore, in scenarios with severe external environmental conditions, existing fresh air systems can only be shut down, failing to meet the need for indoor air recirculation. Utility Model Content

[0003] The purpose of this invention is to provide an anti-backflow air device and a fresh air system using it, aiming to solve the problem that existing fresh air systems cannot simultaneously meet the requirements of protection and internal circulation.

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is achieved through the following technical solution: providing an anti-backflow air device, applied to a fresh air system, the fresh air system having an air inlet pipe and an air outlet pipe, including:

[0005] The base assembly is equipped with a base air inlet and a base air outlet, both of which are connected to the interior.

[0006] The partition assembly includes a partition air inlet, a partition air outlet, and a partition for separating the partition air inlet and the partition air outlet;

[0007] A mixing chamber assembly is disposed on the base assembly. The mixing chamber assembly is provided with a mixing chamber inlet for connecting to the air inlet pipe and a mixing chamber outlet for connecting to the air outlet pipe. The mixing chamber assembly has a mixing chamber inside that communicates with the mixing chamber inlet and the mixing chamber outlet. The partition assembly is located in the mixing chamber.

[0008] A driving component, connected to the separating component and used to drive the separating component to switch between a first position and a second position; wherein, in the first position, the separating component is used to connect the base air inlet and the mixing chamber air inlet through the separating air inlet and to connect the base air outlet and the mixing chamber air outlet through the separating air outlet, and is used to block the mixing chamber air inlet and the mixing chamber air outlet in the second position while allowing the base air inlet, the mixing chamber, and the base air outlet to be sequentially connected.

[0009] Furthermore, the separating component is rotatably disposed within the mixing chamber.

[0010] Furthermore, the mixing chamber assembly includes a cover body that covers the base assembly, the mixing chamber is disposed in the cover body, the cover body has an opening that communicates with the mixing chamber and faces the base assembly, the partition assembly includes a partition body disposed in the mixing chamber, the partition air inlet and the partition air outlet are disposed on the partition body, the drive assembly is drivenly connected to the partition body, and the drive assembly can drive the partition body to rotate within the mixing chamber;

[0011] When the partition body is in the first position, the base air inlet, the partition air inlet, and the mixing chamber air inlet are connected in sequence, and the base air outlet, the partition air outlet, and the mixing chamber air outlet are connected in sequence; when the partition body is in the second position, the partition body closes the mixing chamber air inlet and the mixing chamber air outlet.

[0012] Furthermore, the separator is disposed on the side of the separator body facing the base assembly, and the separator divides the mixing chamber into a first part and a second part, wherein the first part is an air inlet chamber communicating with the separator air inlet, and the second part is an air outlet chamber communicating with the separator air outlet; when the separator body is in the first position, the base air inlet is communicating with the air inlet chamber, and the base air outlet is communicating with the air outlet chamber; when the separator body is in the second position, both the base air inlet and the base air outlet are communicating with the air outlet chamber.

[0013] Furthermore, the middle part of the partition body is provided with a drive connection part for connecting the drive assembly. The partition includes a first baffle and a second baffle. One side of the first baffle and the second baffle are both connected to the drive connection part, and the other side of the first baffle and the second baffle extend to the outer edge of the partition body to enclose the partition air inlet.

[0014] Furthermore, a sliding part is provided around the periphery of the cover body, and a sliding groove is provided on the base assembly. The sliding part is slidably connected to the sliding groove to adjust the position of the cover body. A first fixing part is provided on the cover body, and a second fixing part is provided on the base assembly. The first fixing part and the second fixing part are fixedly connected.

[0015] This utility model also provides a fresh air system, including the anti-backflow air device described above.

[0016] Furthermore, it also includes a fresh air module and a filter assembly, wherein the fresh air module is connected to the base assembly, and the air inlet of the base assembly is connected to the filter assembly.

[0017] Furthermore, it also includes a duct connector, wherein the air inlet and air outlet of the mixing chamber are respectively connected to the corresponding air inlet pipe and air outlet pipe through the duct connector.

[0018] Furthermore, both the air inlet and outlet of the mixing chamber protrude towards the side away from the base assembly to form a protrusion. A first claw is provided around the periphery of the protrusion, and a second claw corresponding to the first claw is provided around the periphery of the duct connector. The first claw and the second claw are engaged and connected.

[0019] This utility model provides an anti-backflow air device for use in a fresh air system. The fresh air system has an air inlet pipe and an air outlet pipe, and includes: a base assembly with a base air inlet and a base air outlet both communicating with the indoor environment; a partition assembly with a partition air inlet, a partition air outlet, and a partition for separating the partition air inlet and the partition air outlet; and a mixing chamber assembly disposed on the base assembly, the mixing chamber assembly having a mixing chamber air inlet for connecting to the air inlet pipe and a mixing chamber air outlet for connecting to the air outlet pipe; the mixing chamber assembly has an internal connection to the air inlet pipe. A mixing chamber is connected to the air inlet and the air outlet of the mixing chamber, and the separating component is located in the mixing chamber; a driving component is connected to the separating component and is used to drive the separating component to switch between a first position and a second position; wherein, in the first position, the separating component is used to connect the air inlet of the base and the air inlet of the mixing chamber through the separating air inlet and to connect the air outlet of the base and the air outlet of the mixing chamber through the separating air outlet, and in the second position, it is used to block the air inlet and the air outlet of the mixing chamber while keeping the air inlet of the base, the mixing chamber, and the air outlet of the base sequentially connected. This utility model, through the cooperation of the separating component and the mixing chamber component in different positions, connects or blocks the air outlets, thus preventing pollutants from flowing back into the room and preventing small animals from entering the room. At the same time, even in harsh outdoor environmental conditions, the fresh air system can be activated, and the anti-backflow air device can be used to achieve internal air circulation in the room. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 An exploded view of an anti-backflow air device provided in an embodiment of this utility model;

[0022] Figure 2A schematic diagram of the external circulation of an anti-backflow air device provided in an embodiment of this utility model;

[0023] Figure 3 A schematic diagram of the internal circulation of an anti-backflow air device provided in an embodiment of this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the mixing chamber assembly provided in an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the structure of the separator component provided in an embodiment of this utility model;

[0026] Figure 6 A schematic diagram of a fresh air system provided in an embodiment of this utility model;

[0027] Figure 7 An exploded view of a fresh air system provided in an embodiment of this utility model;

[0028] Figure 8 This is a schematic diagram of the structure of the duct connector provided in an embodiment of the present utility model.

[0029] Explanation of the markings in the image:

[0030] 10. Base assembly; 11. Base air inlet; 12. Base air outlet; 13. Slide groove; 14. Second fixing part;

[0031] 20. Separator assembly; 21. Separator air inlet; 22. Separator air outlet; 23. Separator component; 231. First baffle; 232. Second baffle; 24. Separator body; 241. Drive connection part;

[0032] 30. Mixing chamber assembly; 31. Mixing chamber air inlet; 32. Mixing chamber air outlet; 33. Mixing chamber; 34. Cover body; 341. Sliding part; 342. First fixing part; 35. Protrusion; 351. First claw;

[0033] 40. Driver components;

[0034] 100. Fresh air module; 200. Filter assembly; 300. Duct connector; 301. Second clamp. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0036] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0037] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0038] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0039] Combination Figures 1 to 3 As shown, this utility model embodiment provides an anti-backflow air device applied to a fresh air system, the fresh air system having an air inlet pipe and an air outlet pipe, including:

[0040] The base assembly 10 is provided with a base air inlet 11 and a base air outlet 12, both of which are connected to the interior.

[0041] The partition assembly 20 is provided with a partition air inlet 21, a partition air outlet 22, and a partition 23 for separating the partition air inlet 21 and the partition air outlet 22;

[0042] A mixing chamber assembly 30 is disposed on a base assembly 10. The mixing chamber assembly 30 is provided with a mixing chamber inlet 31 for connecting the air inlet pipe and a mixing chamber outlet 32 ​​for connecting the air outlet pipe. The mixing chamber assembly 30 is provided with a mixing chamber 33 that communicates with the mixing chamber inlet 31 and the mixing chamber outlet 32. The separator assembly 20 is located in the mixing chamber 33.

[0043] A drive assembly 40 is connected to a partition assembly 20 and is used to drive the partition assembly 20 to switch between a first position and a second position. The partition assembly 20 is used to connect the base air inlet 11 and the mixing chamber air inlet 31 through the partition air inlet 21 and to connect the base air outlet 12 and the mixing chamber air outlet 32 ​​through the partition air outlet 22 when in the first position, and to block the mixing chamber air inlet 31 and the mixing chamber air outlet 32 ​​when in the second position, so that the base air inlet 11, the mixing chamber 33, and the base air outlet 12 are connected sequentially.

[0044] In this embodiment, the anti-backflow device is applied to a fresh air system with an inlet duct and an outlet duct. The base assembly 10 is provided with a base air inlet 11 and a base air outlet 12, both communicating with the interior. The base air inlet 11 (i.e., the fresh air inlet; other air inlets mentioned below can also be referred to as fresh air inlets) is mainly used to draw fresh air from outside into the room, while the base air outlet 12 (i.e., the stale air outlet; other air outlets mentioned below can also be referred to as stale air outlets) is mainly used to expel stale air from the room to the outside. The partition assembly 20 can be disposed inside the mixing chamber assembly 30. The partition assembly 20 includes a partition air inlet 21, a partition air outlet 22, and a partition member 23 located between the two. The partition member 23 is used to physically isolate the air inlet path and the air outlet path to prevent airflow interference. The mixing chamber assembly 30 is fixedly installed on the base assembly 10. The mixing chamber assembly 30 is provided with a mixing chamber air inlet 31 and a mixing chamber air outlet 32, which are used to connect to the external air inlet pipe and air outlet pipe, respectively, to realize the exchange of air with the outside. The mixing chamber assembly 30 forms a mixing chamber 33 inside. During installation, it is necessary to ensure that the mixing chamber air inlet 31 and the base air inlet 11 are aligned with each other in the first position. Similarly, the mixing chamber air outlet 32 ​​and the base air outlet 12 are also aligned with each other. It is also necessary to ensure that the partition air inlet 21 and the base air inlet 11 are aligned with each other in the first position, and the partition air outlet 22 and the base air outlet 12 are also aligned with each other.

[0045] Furthermore, the drive assembly 40 can be a motor, which is installed in the motor mounting hole of the base assembly 10. The output shaft of the drive assembly 40 is connected to the central shaft of the separator assembly 20, thereby realizing the drive control of the separator assembly 20. In actual operation, when the drive assembly 40 brings the separator assembly 20 to the first position (see reference...), Figure 2 As shown), the separating air inlet 21 connects the base air inlet 11 and the mixing chamber air inlet 31, and the separating air outlet 22 connects the base air outlet 12 and the mixing chamber air outlet 32, realizing the air exchange function in the external circulation mode; when the drive component 40 switches the separating component 20 to the second position (see reference...), Figure 3 As shown, the separator 23 blocks the connection path between the base air inlet 11 and the mixing chamber air inlet 31, as well as the connection path between the base air outlet 12 and the mixing chamber air outlet 32, achieving a sealed state to prevent backflow. Simultaneously, the base air inlet 11, the mixing chamber 33, and the base air outlet 12 are sequentially connected to form an internal circulation channel. At this time, the internal circulation mode of the fresh air system can be activated, utilizing the internal circulation channel for air recirculation. In this embodiment, the components are tightly integrated and the structure is reasonable, effectively blocking backflow paths and achieving internal air circulation even in situations with poor indoor and outdoor air quality or harsh external environments.

[0046] This implementation method not only solves the problems of existing fresh air systems lacking anti-backflow devices, which lead to small animals climbing into the indoor unit and biting off the power cords after the air duct is opened, and the bad odor from the outdoor environment blowing into the room and affecting the experience, but also solves the problem of air circulation not being possible when there is a large temperature difference between indoor and outdoor environments or when the outdoor environment is poor.

[0047] In one embodiment, the separator 20 is rotatably disposed in the mixing chamber 33.

[0048] In this embodiment, the separator 20 can switch between internal and external circulation modes, i.e., between the first position and the second position, by changing its position (e.g., rotation, pushing, etc.) under different operating conditions. The separator 20 can be in the form of a turntable structure and can be coaxially arranged inside the mixing chamber 33 to ensure that the airflow channel remains sealed during rotational switching. The output shaft of the drive assembly 40 passes through the bottom of the mixing chamber assembly 30 and is connected to the separator 20, thereby driving the separator 20 to rotate within the mixing chamber 33 in the driving state.

[0049] Combination Figure 4 and Figure 5 As shown, in one embodiment, the mixing chamber assembly 30 includes a covering body 34 that covers the base assembly 10, a mixing chamber 33 is disposed in the covering body 34, the covering body 34 is provided with an opening that communicates with the mixing chamber 33 and faces the base assembly 10, the separating assembly 20 includes a separating body 24 disposed in the mixing chamber 33, a separating air inlet 21 and a separating air outlet 22 are disposed on the separating body 24, and a driving assembly 40 is drivingly connected to the separating body 24, the driving assembly 40 can drive the separating body 24 to rotate in the mixing chamber 33;

[0050] When the partition body 24 is in the first position, the base air inlet 11, the partition air inlet 21 and the mixing chamber air inlet 31 are connected in sequence, and the base air outlet 12, the partition air outlet 22 and the mixing chamber air outlet 32 ​​are connected in sequence; when the partition body 24 is in the second position, the partition body 24 closes the mixing chamber air inlet 31 and the mixing chamber air outlet 32.

[0051] In this embodiment, the cover body 34 is a component with a certain cavity structure, and the interior of the cover body 34 is provided with a mixing cavity 33 for accommodating the separator component 20. The mixing cavity 33 has an opening facing the base component 10, which is used to connect with the base air inlet 11 and the base air outlet 12 to form an airflow path. The separator body 24 is rotatably disposed in the mixing cavity 33, and the separator body 24 is provided with a separator air inlet 21 and a separator air outlet 22 for connecting the air inlet pipe and the air outlet pipe respectively. The output shaft of the drive component 40 is drivenly connected to the separator body 24, which can drive the separator body 24 to rotate and switch within the mixing cavity 33.

[0052] Specifically, when the partition body 24 is in the first position, the base air inlet 11, the partition air inlet 21, and the mixing chamber air inlet 31 are aligned sequentially to form an air inlet channel. At the same time, the base air outlet 12, the partition air outlet 22, and the mixing chamber air outlet 32 ​​are also aligned sequentially to form an air outlet channel, thereby realizing the air exchange function in the external circulation mode. When the partition body 24 is in the second position, the partition air inlet 21 and the mixing chamber air inlet 31 are no longer aligned, and the partition air outlet 22 and the mixing chamber air outlet 32 ​​are also deflected and misaligned. The sealing surface formed by the partition body 24 by its body structure can seal the mixing chamber air inlet 31 and the mixing chamber air outlet 32, realizing the closure of the channel opening, that is, switching from the external circulation mode to the internal circulation mode. The preferred partition body 24 is set at the bottom of the mixing chamber 33. When the partition body 24 is in the second position, it can better block the air inlet 31 and the air outlet 32 ​​of the mixing chamber. At the same time, it can make greater use of the space of the mixing chamber 33, so that the internal circulation channel formed by the base air inlet 11, the mixing chamber 33 and the base air outlet 12 is smoother.

[0053] In one embodiment, a separator 23 is disposed on the side of the separator body 24 facing the base assembly 10. The separator 23 divides the mixing chamber 33 into a first part and a second part, wherein the first part is an air inlet chamber communicating with the separator air inlet 21, and the second part is an air outlet chamber communicating with the separator air outlet 22. When the separator body 24 is in the first position, the base air inlet 11 is communicating with the air inlet chamber, and the base air outlet 12 is communicating with the air outlet chamber. When the separator body 24 is in the second position, both the base air inlet 11 and the base air outlet 12 are communicating with the air outlet chamber.

[0054] In this embodiment, the partition member 23 in the partition assembly 20 is disposed on the side of the partition body 24 facing the base assembly 10, that is, the partition member 23 is located between the partition body 24 and the base assembly 10, and structurally forms a spatial division of the mixing chamber 33. Specifically, the partition member 23 is a radially extending plate-shaped member, which divides the interior of the mixing chamber 33 into two independent sub-cavities, namely a first part and a second part. The first part constitutes an air inlet cavity, which is connected to the partition air inlet 21 disposed on the partition body 24, and is used to guide the air flowing in from the air inlet pipe into the base air inlet 11 through the mixing chamber air inlet 31 to realize the fresh air input function; the second part constitutes an air outlet cavity, which is connected to the partition air outlet 22 disposed on the partition body 24, and is used to guide the indoor air out through the base air outlet 12, and then discharge it to the air outlet pipe through the mixing chamber air outlet 32 ​​to realize the indoor stale air discharge function.

[0055] During operation, when the partition body 24 is controlled by the drive assembly 40 and rotates to the first position, the base air inlet 11 on the base assembly 10 is connected to the air inlet cavity. At this time, the air path passes from the outside through the mixing cavity air inlet 31, the partition air inlet 21, and the base air inlet 11 in sequence and enters the room. At the same time, the base air outlet 12 is connected to the air outlet cavity, and the air from the room enters the partition air outlet 22 through the base air outlet 12, and then is discharged to the outside through the mixing cavity air outlet 32. When the partition body 24 rotates to the second position, the position of the partition 23 relative to the base air inlet 11 and the base air outlet 12 is offset, so that the base air inlet 11 is no longer connected to the air inlet cavity, but establishes an airflow connection with the air outlet cavity; similarly, the base air outlet 12 is also connected to the air outlet cavity. At this time, both the base air inlet 11 and the base air outlet 12 are directed to the same airflow space, namely the interior of the air outlet cavity. This is the internal circulation channel formed by the base air inlet 11, the mixing cavity 33, and the base air outlet 12, which is actually composed of the base air inlet 11, the air outlet cavity, and the base air outlet 12 connected in sequence. Since the mixing cavity air inlet 31 and the mixing cavity air outlet 32 ​​are blocked by the partition body 24 structure in this state, external air cannot enter the mixing cavity assembly 30, forming a closed state and effectively blocking the backflow channel of outdoor air.

[0056] In one embodiment, the middle part of the partition body 24 is provided with a drive connection part 241 for connecting the drive assembly 40. The partition 23 includes a first baffle 231 and a second baffle 232. One side of the first baffle 231 and the second baffle 232 are connected to the drive connection part 241, and the other side of the first baffle 231 and the second baffle 232 extend to the outer edge of the partition body 24 to enclose the partition air inlet 21.

[0057] In this embodiment, a drive connection portion 241 is provided in the middle structure of the partition body 24 for connecting with the drive assembly 40. Specifically, the drive connection portion 241 is a coaxial mounting hole or motor shaft hole, and is located at the central axis of the partition body 24 for docking with the output shaft of the drive assembly 40. Through the drive connection portion 241, the drive assembly 40 can stably transmit rotational torque to the entire partition body 24, thereby achieving controllable rotation of the partition body 24 within the mixing chamber 33. The partition member 23 is installed on the side of the partition body 24 facing the base assembly 10, and includes a first baffle 231 and a second baffle 232. The inner ends of both the first baffle 231 and the second baffle 232 are connected to the drive connection portion 241 to form a support structure, ensuring that the baffles remain structurally stable during the rotation of the partition body 24 and do not shift or fall off. Preferably, the first baffle 231 and the second baffle 232 can be fixed to the drive connection part 241 by snap-fit ​​or integral molding to improve the assembly firmness.

[0058] Furthermore, the outer sides of the first baffle 231 and the second baffle 232 extend towards the outer edge of the partition body 24 to the cavity wall of the mixing chamber 33, with the extended portions surrounding the outer edge of the partition air inlet 21. The ends of the first baffle 231 and the second baffle 232 away from the partition body 24 are connected to the base assembly 10, thereby forming a physical partition. In this embodiment, the first baffle 231 and the second baffle 232 surround the partition air inlet 21 as an air inlet cavity, which occupies approximately one-quarter of the area of ​​the partition body 24, while the remaining three-quarters of the area serves as an air outlet cavity.

[0059] Combination Figure 6 As shown, in one embodiment, a sliding part 341 is provided around the periphery of the cover body 34, and a groove 13 is provided on the base assembly 10. The sliding part 341 is slidably connected to the groove 13 to adjust the position of the cover body 34. A first fixing part 342 is provided on the cover body 34, and a second fixing part 14 is provided on the base assembly 10. The first fixing part 342 and the second fixing part 14 are fixedly connected.

[0060] In this embodiment, to achieve stable installation of the mixing chamber assembly 30, a sliding portion 341 (such as a slide bar) is provided around the periphery of the cover body 34 for sliding assembly with the slide groove 13 on the base assembly 10. Specifically, the sliding portion 341 is a raised slide bar structure integrally formed or assembled along the bottom edge of the cover body 34, and its cross-section can be rectangular, T-shaped, or other geometric shapes that facilitate insertion and guidance. The slide groove 13 that cooperates with the sliding portion 341 is formed on the outer surface of the base assembly 10 and extends along the sliding direction of the cover body 34. When assembling the mixing chamber assembly 30, the operator can first align the sliding portion 341 of the cover body 34 with the slide groove 13 on the base assembly 10, and insert and push the cover body 34 to the preset installation position by sliding. During this process, the sliding portion 341 and the slide groove 13 form a sliding connection relationship, so that the cover body 34 can be moved in a controlled manner on the base assembly 10, which facilitates installation and positioning and ensures the assembly docking accuracy.

[0061] To further enhance the structural stability of the cover body 34 after installation and prevent it from shifting due to vibration during operation, a first fixing part 342 is provided on the cover body 34, and a corresponding second fixing part 14 is provided on the base assembly 10. The first fixing part 342 and the second fixing part 14 correspond to each other in position and are typically screw mounting holes, snap-fit ​​structures, or other connection forms that can achieve reliable fixation. Preferably, in the final positioning step after the cover body 34 is slid into the slide groove 13, the operator can lock the mixing chamber assembly 30 onto the base assembly 10 by passing a screw through the first fixing part 342 and screwing it into the second fixing part 14, forming a stable installation structure.

[0062] This utility model also provides a fresh air system, including the anti-backflow air device described above.

[0063] In this embodiment, the fresh air system is suitable for enclosed environments requiring air exchange and purification, such as residences, office buildings, and commercial spaces. It aims to improve indoor air quality and enhance the system's operational stability and safety in complex environments. By integrating an anti-backflow device, the fresh air system not only achieves intelligent exchange of indoor and outdoor air but also possesses multiple functions including anti-backflow, pest control, and autonomous air purification. This significantly enhances the system's safety, adaptability, and comfort, making it suitable for widespread application in various scenarios and demonstrating high practical value and industrialization prospects.

[0064] Combination Figure 7 As shown, in one embodiment, it also includes a fresh air module 100 and a filter assembly 200. The fresh air module 100 is connected to the base assembly 10, and the base air inlet 11 is connected to the filter assembly 200.

[0065] In this embodiment, under normal operating conditions, the fresh air system allows fresh outdoor air to enter the mixing chamber assembly 30 through the fresh air module 100 via the air inlet duct. After passing through the partition assembly 20 and the base assembly 10, the fresh air flows into the room. Simultaneously, stale indoor air is introduced through the base outlet 12 and discharged to the outside through the outlet duct, completing the external air circulation function. When the system detects poor outdoor environmental quality or a large temperature difference between indoors and outdoors, the drive assembly 40 controls the partition assembly 20 to rotate to a second position. At this time, the mixing chamber inlet 31 and mixing chamber outlet 32 ​​are blocked by the partition body 24, preventing external air from entering the system and achieving a backflow prevention and sealing state.

[0066] In the closed state, when the fresh air module 100 is turned on, the fresh air system automatically switches to internal circulation purification mode. The filter component 200 is connected to the base component 10, and the air forms a closed-loop flow path in the mixing chamber 33. The air undergoes multi-stage purification through the filter component 200 (including a pre-filter or a high-efficiency HEPA filter unit), and the purified air is then returned to the room, effectively improving air quality. During this process, indoor and outdoor air quality sensors can be used for real-time detection, and combined with set thresholds, the fan speed and the internal / external circulation switching logic can be dynamically adjusted. When the fresh air module 100 is turned on, its operation is controlled in real-time by the detection results of indoor and outdoor sensors. The indoor ambient air quality is A0, and the outdoor ambient air quality is A1. A0 and A1 mainly depend on f (such as oxygen concentration, PM2.5 content, and odor concentration); the larger the f, the worse the current ambient air quality. The operating state of the fresh air module 100, i.e., its ventilation effect, mainly depends on its internal fan speed; the higher the fan speed, the better the ventilation effect. Based on the comparison between indoor and outdoor ambient air quality, the current operating status m of the fresh air module 100 can be determined. (t)The specific formula is as follows:

[0067]

[0068] In one embodiment, a duct connector 300 is also included, and the mixing chamber air inlet 31 and the mixing chamber air outlet 32 ​​are respectively connected to the corresponding air inlet pipe and air outlet pipe through the duct connector 300.

[0069] In this embodiment, the duct connector 300 is installed on the outside of the mixing chamber assembly 30, specifically for connecting the mixing chamber inlet 31 to the inlet pipe and the mixing chamber outlet 32 ​​to the outlet pipe. The duct connector 300 includes a connecting body, a pipe connection thread, and a clamping structure. The connecting body is a hollow tubular structure, with one end having an interface for inserting into the mixing chamber inlet 31 or the mixing chamber outlet 32, and the other end having an external thread structure or a snap-fit ​​interface for fixed connection with the corresponding inlet or outlet pipe. The duct connector 300 ensures good sealing performance and vibration resistance during use, preventing air leakage or loosening of the connector.

[0070] Combination Figure 8 As shown, in one embodiment, the mixing chamber air inlet 31 and the mixing chamber air outlet 32 ​​both protrude to the side away from the base assembly 10 to form a protrusion 35. A first claw 351 is provided around the protrusion 35, and a second claw 301 corresponding to the first claw 351 is provided around the duct connector 300. The first claw 351 and the second claw 301 are snapped together.

[0071] In this embodiment, to achieve a detachable connection between the mixing chamber assembly 30 and the duct connector 300, both the mixing chamber inlet 31 and the mixing chamber outlet 32 ​​protrude towards the side away from the base assembly 10, forming protrusions 35 respectively. The protrusions 35 are integrally formed cylindrical or short tubular structures, hollow axially to facilitate smooth airflow during connection. The protrusions 35 are located at the end of the housing of the mixing chamber assembly 30, with their orientation aligned with the air inlet or outlet passage and opposite to the base assembly 10, thus facilitating connection to an external piping system. The outer periphery of the protrusions 35 is provided with first claws 351. Preferably, multiple first claws 351 are provided and evenly distributed, with shapes including tooth structures or hook-shaped protrusions, enabling stable mechanical locking with external components during insertion. The duct connector 300 is provided with second claws 301 that correspond to and cooperate with the first claws 351. The second claw 301 is located on the inner wall or edge of the connecting end of the duct connector 300 and is adapted to the first claw 351. The second claw 301 can be a groove, a hook, or an elastic spring, etc. It can produce radial or axial elastic deformation during insertion and then automatically reset to complete the locking.

[0072] During installation, the operator aligns the connecting end of the duct connector 300 with the protrusion 35 on the mixing chamber assembly 30 and inserts it. When the duct connector 300 is pushed in to a certain depth, the second claw 301 engages with the first claw 351 on the outer periphery of the protrusion 35, producing a "click" sound to indicate that the connection is complete. By providing protrusions 35 at the mixing chamber inlet 31 and the mixing chamber outlet 32, and supplementing them with the snap-fit ​​structure of the first claw 351 and the second claw 301, the duct connection structure in the fresh air system achieves an efficient, sealed, and reliable connection method, effectively avoiding problems such as loose connections, air leakage, or maintenance difficulties.

[0073] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An anti-backflow air device, applied to a fresh air system, the fresh air system having an air inlet pipe and an air outlet pipe, characterized in that, include: The base assembly is equipped with a base air inlet and a base air outlet, both of which are connected to the interior. The partition assembly includes a partition air inlet, a partition air outlet, and a partition for separating the partition air inlet and the partition air outlet; A mixing chamber assembly is disposed on the base assembly. The mixing chamber assembly is provided with a mixing chamber inlet for connecting to the air inlet pipe and a mixing chamber outlet for connecting to the air outlet pipe. The mixing chamber assembly has a mixing chamber inside that communicates with the mixing chamber inlet and the mixing chamber outlet. The partition assembly is located in the mixing chamber. A driving component, connected to the separating component and used to drive the separating component to switch between a first position and a second position; wherein, in the first position, the separating component is used to connect the base air inlet and the mixing chamber air inlet through the separating air inlet and to connect the base air outlet and the mixing chamber air outlet through the separating air outlet, and is used to block the mixing chamber air inlet and the mixing chamber air outlet in the second position while allowing the base air inlet, the mixing chamber, and the base air outlet to be sequentially connected.

2. The anti-backflow air device according to claim 1, characterized in that, The separator assembly is rotatably disposed within the mixing chamber.

3. The anti-backflow air device according to claim 2, characterized in that, The mixing chamber assembly includes a cover body that covers the base assembly, the mixing chamber being disposed within the cover body, and the cover body having an opening communicating with the mixing chamber and facing the base assembly. The partition assembly includes a partition body disposed within the mixing chamber, a partition air inlet and a partition air outlet being disposed on the partition body, and a drive assembly being drively connected to the partition body, the drive assembly being capable of driving the partition body to rotate within the mixing chamber. When the partition body is in the first position, the base air inlet, the partition air inlet, and the mixing chamber air inlet are connected in sequence, and the base air outlet, the partition air outlet, and the mixing chamber air outlet are connected in sequence; when the partition body is in the second position, the partition body closes the mixing chamber air inlet and the mixing chamber air outlet.

4. The anti-backflow air device according to claim 3, characterized in that, The separator is disposed on the side of the separator body facing the base assembly. The separator divides the mixing chamber into a first part and a second part, wherein the first part is an air inlet chamber communicating with the separator air inlet, and the second part is an air outlet chamber communicating with the separator air outlet. When the separator body is in the first position, the base air inlet is communicating with the air inlet chamber, and the base air outlet is communicating with the air outlet chamber. When the separator body is in the second position, both the base air inlet and the base air outlet are communicating with the air outlet chamber.

5. The anti-backflow air device according to claim 4, characterized in that, The partition body has a drive connection part in the middle for connecting the drive assembly. The partition includes a first baffle and a second baffle. One side of the first baffle and the second baffle are connected to the drive connection part. The other side of the first baffle and the second baffle extend to the outer edge of the partition body to enclose the partition air inlet.

6. The anti-backflow air device according to claim 3, characterized in that, The cover body is provided with a sliding part around its periphery, and the base assembly is provided with a sliding groove. The sliding part is slidably connected to the sliding groove to adjust the position of the cover body. The cover body is provided with a first fixing part, and the base assembly is provided with a second fixing part. The first fixing part and the second fixing part are fixedly connected.

7. A fresh air system, characterized in that, Includes the backflow prevention device as described in any one of claims 1-6.

8. The fresh air system according to claim 7, characterized in that, It also includes a fresh air module and a filter assembly, wherein the fresh air module is connected to the base assembly, and the air inlet of the base assembly is connected to the filter assembly.

9. The fresh air system according to claim 7, characterized in that, It also includes a duct connector, through which the air inlet and outlet of the mixing chamber are connected to the corresponding air inlet and air outlet pipes, respectively.

10. The fresh air system according to claim 9, characterized in that, Both the air inlet and outlet of the mixing chamber protrude towards the side away from the base assembly to form a protrusion. A first claw is provided around the periphery of the protrusion, and a second claw corresponding to the first claw is provided around the periphery of the duct connector. The first claw and the second claw are engaged and connected.

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