Fresh air indoor air port

Abstract

The invention discloses a fresh air indoor air port, and relates to the technical field of fresh air systems. The air port comprises a main shell embedded into a wall body, a detachable air return panel and a filter assembly. An equipment air return port, a fresh air taking port and an equipment fresh air port are formed in the back of the main shell; and a folded plate structure is arranged in the box body to physically divide the space into a fresh air communication cavity and an air return cavity which are not communicated with each other. The fresh air taking opening and the equipment fresh air opening form an independent fresh air introduction filtering loop through the fresh air communication cavity, and the equipment air return opening is directly communicated with the air return cavity to extract indoor return air. The filtering assembly is arranged in the fresh air communicating cavity. According to the fresh air system, the double-loop structure is integrated, airflow short circuit is effectively eradicated, meanwhile, by means of the design of the cup joint type panel, the function that a user can disassemble the panel and replace the filter screen with bare hands indoors is achieved, and the maintenance difficulty and the high-altitude operation risk of the fresh air system are greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of fresh air system technology, and in particular to a fresh air indoor vent. Background Technology

[0002] With the increasing emphasis on airtightness in modern buildings and growing public concern for indoor respiratory health, fresh air system technology has been widely applied and developed. The main characteristic of this technology is that it uses mechanical ventilation to introduce filtered fresh outdoor air into the room while simultaneously expelling stale indoor air, thereby improving indoor air quality. To achieve this ventilation process, current fresh air systems typically require air vents to be installed on the building's exterior walls or windows, connected to indoor fan equipment via ventilation ducts—the traditional wall-mounted air inlets or combined duct systems.

[0003] In traditional technology, the filter units (filters) of fresh air systems typically employ two arrangement methods: one is direct integration into the main fresh air unit inside the ceiling, and the other is placement inside the rainproof cover of the outdoor air intake or at the front end of the duct. When maintenance is required, if the filter is built into the main unit, the user needs to climb a ladder and remove the inspection panel and machine cover on the ceiling to replace it; if the filter is on the outdoor side, it needs to be cleaned or replaced by accessing the air intake from outside the building.

[0004] However, the current arrangement or traditional device has serious drawbacks in terms of maintenance and use. First, for high-rise residential buildings or buildings without an outdoor operating platform, the air intake located on the exterior wall is at a high altitude, making it impossible for users to safely access it from inside the house to replace the filter. This often results in severe dust accumulation at the air intake front end that cannot be cleaned. Second, for the main unit installed in the ceiling, filter replacement is complicated and laborious, especially in the aftermarket (adding fresh air systems to renovated houses). Often, the ceiling structure or the lack of a pre-reserved access panel makes filter replacement extremely difficult. Due to the inconvenience of replacement, users often fail to replace the filter for extended periods. This not only increases air intake resistance and reduces airflow but also easily leads to secondary pollution in the ductwork, rendering the fresh air system ineffective. Summary of the Invention

[0005] Therefore, it is necessary to provide a fresh indoor air vent to address the above problems.

[0006] This application provides a fresh air indoor vent, including a main housing, a return air panel, and a filter assembly. The main housing is embedded in an opening in the wall and has at least two duct interfaces, each including an equipment air inlet and a fresh air intake. The equipment air inlet is used to connect to the air inlet of a fresh air device, and the fresh air intake is used to connect to the outside to introduce fresh air. The return air panel is detachably installed on the side of the main housing facing the room and forms a receiving cavity with the main housing. The filter assembly is installed in the receiving cavity.

[0007] Optionally, the return air panel is provided with a return air channel, and the return air channel is provided with return air louvers. The return air louvers are used to adjust the opening and closing angle to control the airflow through the return air panel.

[0008] Optionally, the filter assembly includes a first filter and a second filter; the first filter is disposed inside the main housing in a flow channel corresponding to the air inlet of the device; the second filter is disposed inside the main housing in a flow channel corresponding to the fresh air inlet.

[0009] Optionally, the number of duct interfaces is three, including an equipment air inlet and a fresh air intake. The equipment air inlet includes a fresh air inlet and a return air inlet. The fresh air inlet is used to connect to the equipment's fresh air inlet to draw fresh air from the fresh air intake. The return air inlet is used to connect to the equipment's return air inlet to draw indoor return air.

[0010] Optionally, the equipment return air vent is located below the fresh air intake vent and the equipment fresh air inlet, the fresh air intake vent and the equipment fresh air inlet are arranged side by side, and the main housing is provided with a folding plate structure corresponding to the fresh air intake vent and the equipment fresh air inlet, the folding plate structure and the main housing forming a connecting cavity for connecting the equipment fresh air inlet and the fresh air intake vent.

[0011] Optionally, the main housing has an open end facing the room, and the return air panel includes a panel body and a plug-in frame. The plug-in frame is connected to the panel body and extends toward the main housing, and its external dimensions are adapted to the inner wall dimensions of the main housing. During installation, the plug-in frame is inserted into the internal receiving cavity of the main housing through the open end to form a sleeve structure.

[0012] Optionally, the edge of the return air panel extends outward to form a limiting flange, which abuts against the end face of the main housing when the plug-in frame is installed inside the main housing.

[0013] Optionally, the duct interface is an outwardly extending circular tube structure, and the main housing is provided with a groove or bracket corresponding to the position where the filter component is installed, so as to fix the filter component.

[0014] Optionally, the fresh air intake extends to the exterior wall of the building via a duct, and a rain cap and / or insect screen are installed at the end of the duct.

[0015] Optionally, the main housing and return air panel are circular or square.

[0016] Compared with the prior art, the technical solution provided in this application has the following advantages: The core structure of the aforementioned indoor fresh air vent includes a main housing, a return air panel, and a filter assembly. The main housing is designed as an embedded structure, pre-embedded or fixed within a wall opening during installation, thus not occupying additional indoor space. The main housing integrates at least two duct interfaces, specifically an equipment air inlet and a fresh air intake. The equipment air inlet connects to the air intake end (i.e., the return air end) of the fresh air system, used to draw in stale indoor air; while the fresh air intake establishes a path for introducing fresh air, connecting to the outside or the system to introduce fresh air. The return air panel is detachably installed on the indoor-facing side of the main housing, forming an internal cavity after being snapped into place, where the filter assembly is housed.

[0017] The detachable design of the return air panel (such as magnetic or snap-on fasteners) not only serves a decorative purpose but also physically defines the boundaries of the receiving cavity. When the return air panel is closed, it, together with the main housing, forms a filter box with airflow guidance function. The filter components are deliberately positioned on the path of airflow before it enters the equipment's air inlet, i.e., within the receiving cavity. This moves the most frequently replaced and most easily soiled consumable components in the fresh air system from the hard-to-reach interior of the main unit or the dangerous outdoor port to an easily accessible indoor wall port. In actual use, users do not need to use a ladder to remove the ceiling panels or lean out of the window; they can simply remove the return air panel like opening a drawer or cover to directly observe the degree of soiling of the filter and clean or replace it. This solves the industry pain point of traditional fresh air systems, which suffer from long-term filter clogging, airflow reduction, and even secondary pollution due to difficult maintenance, ensuring that the air entering the fresh air equipment is always in a state of low resistance and high cleanliness. This system completely eliminates the drawbacks of traditional fresh air systems where replacing filters requires climbing ceilings or performing outdoor high-altitude work. Users can simply remove the return air panel indoors to directly access and replace the filter components inside the housing, greatly reducing maintenance difficulty and improving the user experience. It is particularly suitable for retrofitting fresh air systems in the home aftermarket. Attached Figure Description

[0018] Figure 1 This application provides an exploded structural diagram of the indoor fresh air vent. Figure 2 A three-dimensional structural diagram of the back of the indoor fresh air vent provided in this application; Figure 3This is a schematic diagram of the overall assembly structure of the indoor fresh air vent provided in this application; Figure 4 The partial cross-sectional structural diagram of the indoor fresh air vent provided for this application mainly shows the installation position of the internal filter; Figure 5 A three-dimensional structural diagram of the back of the indoor fresh air vent provided in this application; Figure 6 The schematic diagram of the internal structure of the main shell provided in this application mainly shows the folded plate structure used to separate the fresh air cavity and the return air cavity.

[0019] Explanation of reference numerals in the attached figures: 1. Main casing; 2. Return air panel; 3. Filter assembly; 11. Equipment air inlet; 111. Equipment fresh air inlet; 112. Equipment return air inlet; 12. Fresh air intake; 13. Folded plate structure; 21. Return air louver; 22. Panel body; 23. Insert frame; 31. First filter screen; 32. Second filter screen. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] See Figures 1 to 3 An embodiment of the present invention provides a fresh air indoor air outlet, characterized in that it includes a main housing 1, a return air panel 2, and a filter assembly 3. The main housing 1 is embedded in an opening in the wall and is provided with at least two duct interfaces, including an equipment air inlet 11 and a fresh air intake 12. The equipment air inlet 11 is used to connect to the air inlet of the fresh air equipment, and the fresh air intake 12 is used to connect to the outside to introduce fresh air. The return air panel 2 is detachably installed on the side of the main housing 1 facing the room and forms a receiving cavity with the main housing 1. The filter assembly 3 is installed in the receiving cavity.

[0022] See Figures 1 to 3This embodiment provides a fresh air indoor vent, the core structure of which includes a main housing 1, a return air panel 2, and a filter assembly 3. The main housing 1 is designed as an embedded structure, pre-embedded or fixed in a wall opening during installation, thus not occupying additional indoor space. The main housing 1 integrates at least two duct interfaces, specifically including an equipment air inlet 11 and a fresh air intake 12. The equipment air inlet 11 is connected to the air intake end (i.e., the return air end) of the fresh air equipment, used to draw indoor stale air into the equipment; while the fresh air intake 12 establishes a path for introducing fresh air, connecting to the outside or the equipment to introduce fresh air. The return air panel 2 is detachably installed on the indoor-facing side of the main housing 1, forming a receiving cavity inside after being fastened to the main housing 1, where the filter assembly 3 is placed.

[0023] See Figure 1 and Figure 4 The detachable design of the return air panel 2 (such as magnetic or snap-on fasteners) not only serves a decorative purpose but also physically defines the boundaries of the receiving cavity. When the return air panel 2 is closed, it, together with the main housing 1, forms a filter box with airflow guiding function. The filter assembly 3 is deliberately positioned on the necessary path of airflow before it enters the equipment's air inlet 11, i.e., within the receiving cavity. This moves the most frequently replaced and most easily soiled consumable components in the fresh air system from the hard-to-reach interior of the main unit or the dangerous outdoor port to an easily accessible indoor wall port. In actual use, users do not need to use a ladder to remove the ceiling panels or lean out of the window; they can simply remove the return air panel 2 like opening a drawer or cover to directly observe the degree of soiling of the filter and clean or replace it. This solves the industry pain point of traditional fresh air systems, which suffer from long-term filter clogging, airflow reduction, and even secondary pollution due to difficult maintenance, ensuring that the air entering the fresh air equipment is always kept in a low-resistance, high-cleanliness state. This system completely eliminates the drawbacks of traditional fresh air systems where replacing filters requires climbing ceilings or performing outdoor high-altitude work. Users can simply remove the return air panel 2 indoors to directly access and replace the filter components 3 inside the housing, greatly reducing maintenance difficulty and improving the user experience. It is particularly suitable for retrofitting fresh air systems in the home aftermarket.

[0024] See Figure 3 and Figure 4In one embodiment, a return air channel is provided on the return air panel 2, and return air louvers 21 are provided on the return air channel. The return air louvers 21 are used to adjust the opening and closing angle to control the airflow through the return air panel 2. Based on the above embodiment, this embodiment optimizes the structure of the return air panel 2. A dedicated return air channel is provided on the return air panel 2, and return air louvers 21 are provided on the channel. These return air louvers 21 are not fixed, but are designed with an adjustable angle. Users can manually adjust the opening and closing angle of the louvers according to actual needs. The technical effect of this feature is that it provides a flexible means of airflow control. For example, when users want to quickly replace indoor air, they can open the louvers completely to maximize the return airflow; when the main need is to introduce fresh air or to reduce wind noise, the louver angle can be appropriately reduced. This design makes the air outlet not just a passive ventilation component, but an active control node that can participate in the airflow organization and adjustment, realizing the indirect control of the ratio of indoor return air to fresh air introduction.

[0025] See Figure 3 and Figure 4 Although the fan speed of a fresh air unit is usually adjusted as a whole, users can fine-tune the airflow at the terminal through the louvers and valves in this embodiment. When the user reduces the opening of the return air louver 21 to increase the return air resistance, the efficiency of the fresh air unit in drawing air from the room will decrease accordingly. However, the amount of fresh air introduced from the outside by the unit remains relatively stable or increases due to the influence of the fan characteristic curve. This helps to establish a slightly positive pressure environment indoors and prevent dirty outdoor air from seeping in through gaps in doors and windows. Conversely, in scenarios requiring rapid exhaust, such as when someone is smoking or cooking indoors, the user can adjust the louver angle to the maximum fully open state. At this time, the airflow resistance is minimal, maximizing the ventilation efficiency. In conjunction with the fresh air inlet regulating valve mentioned above, users can even further reduce the fresh air intake, forcing the unit to draw in stale indoor air at full power, achieving directional and powerful exhaust. This purely mechanical adjustment method has significant advantages over expensive electric damper systems, including low cost, low failure rate, and intuitive operation, perfectly meeting the demand for high cost-effectiveness and ease of maintenance in the aftermarket residential market.

[0026] See Figure 1In one embodiment, for the fresh air indoor vent in the aforementioned embodiments, in order to achieve precise control of the amount of outdoor fresh air introduced, a regulating valve is integrated inside the fresh air intake vent 12 (i.e., the port connecting to the outside) on the main housing 1. This regulating valve adopts a butterfly valve or sliding valve structure, and its control lever or knob is located in the receiving cavity inside the main housing 1. When the user removes the return air panel 2 to replace the filter, they can directly access the control mechanism of this regulating valve. In terms of airflow operation logic, since the fresh air equipment usually simultaneously draws indoor return air and outdoor fresh air, the presence of this regulating valve enables the vent to have a stepless adjustment effect for the mixing ratio. For example, in cases of extremely low outdoor temperatures in winter or extremely high outdoor temperatures in summer, the user can manually reduce the opening of the fresh air regulating valve (e.g., from 100% to 20%), thereby increasing the fresh air intake resistance and forcing the fresh air equipment to draw more indoor air from the return air panel 2. This regulation mechanism effectively reduces the impact of outdoor cooling / heating loads on indoor temperature, achieving energy-saving operation. When outdoor air quality is extremely poor (such as during sandstorms), users can even completely close the valves, temporarily switching the system to a pure internal circulation purification mode, thus giving the passive air vents the ability to actively respond to climate change.

[0027] See Figure 1 and Figure 4 In one embodiment, the filter assembly 3 includes a first filter 31 and a second filter 32; the first filter 31 is disposed inside the main housing 1 in the flow channel corresponding to the air inlet 11 of the device; the second filter 32 is disposed inside the main housing 1 in the flow channel corresponding to the fresh air inlet.

[0028] See Figure 1 and Figure 4 This embodiment further refines the configuration of the filter component 3, employing a dual filtration strategy. The filter component 3 includes a first filter 31 and a second filter 32, which are independent of each other in terms of space and function. The first filter 31 is located inside the main housing 1 in the flow channel corresponding to the air inlet 11 of the equipment, mainly used to filter the air drawn from the room, intercepting large particulate impurities such as lint and hair, and preventing them from entering the fresh air equipment and clogging the fan or heat exchange core. The second filter 32 is located inside the main housing 1 in the flow channel corresponding to the fresh air inlet (i.e., the fresh air introduction path), used to filter the introduced outdoor fresh air, intercepting pollutants such as PM2.5 and dust. The technical effect of this embodiment is to achieve two-way protection: it protects the fresh air equipment from indoor dust, extending the equipment's lifespan, and ensures that the fresh air entering the room or equipment is clean, protecting respiratory health from the source.

[0029] See Figure 5In one embodiment, the number of duct interfaces is three, including an equipment air inlet 11 and a fresh air intake 12. The equipment air inlet 11 includes a fresh air inlet 111 and a return air inlet 112. The fresh air inlet 111 is used to connect to the fresh air inlet of the equipment to draw fresh air from the fresh air intake 12, and the return air inlet 112 is used to connect to the return air inlet of the equipment to draw indoor return air.

[0030] See Figure 5 This embodiment demonstrates a highly integrated three-outlet structure, clearly defining the function of the outlet as an airflow transfer station. The duct interface is expanded to three: a fresh air inlet 111, a return air inlet 112, and a fresh air intake inlet 12. Its working logic is as follows: the fresh air inlet of the fresh air system is connected to the fresh air inlet 111 in this embodiment via a duct, thereby generating suction. Outdoor air is then drawn in through the fresh air intake inlet 12 and delivered to the machine. Simultaneously, the indoor return air inlet of the fresh air system is connected to the return air inlet 112 in this embodiment via a duct, directly drawing in indoor air. The technical advantage of this embodiment is that it greatly simplifies the ductwork layout of the fresh air system. By concentrating the negative pressure ducts for the machine's fresh air intake and indoor return air into a single wall-mounted outlet box, the fresh air unit can be flexibly installed away from the exterior wall. Only a flexible hose connection to this outlet is needed to simultaneously achieve fresh air intake and return air operations, avoiding the cumbersome construction of opening multiple holes in the exterior wall.

[0031] See Figure 6 In one embodiment, the equipment return air vent 112 is located below the fresh air intake vent 12 and the equipment fresh air vent 111. The fresh air intake vent 12 and the equipment fresh air vent 111 are arranged side by side, and the main housing 1 is provided with a folding plate structure 13 corresponding to the fresh air intake vent 12 and the equipment fresh air vent 111. The folding plate structure 13 and the main housing 1 form a connecting cavity for connecting the equipment fresh air vent 111 and the fresh air intake vent 12.

[0032] See Figure 6 To address the complex airflow patterns within the three-port system, this embodiment employs a unique internal partitioning design. The equipment return air vent 112 is located in the lower region, while the fresh air intake vent 12 and the fresh air inlet 111 are arranged side-by-side in the upper region. Crucially, a folded plate structure 13 is added inside the main housing 1. This folded plate structure 13 encloses the areas containing the two upper interfaces, forming an independent connecting cavity. The technical advantage of this feature is that it physically eliminates airflow short-circuiting (cross-flow). The folded plate structure 13 completely isolates the outdoor fresh air intake duct from the indoor stale return air duct, ensuring that 100% of the fresh air drawn in by the fresh air equipment through the upper interface is fresh outdoor air, without mixing with the stale indoor air below. This structure achieves non-interference of dual-loop airflow within a compact space, guaranteeing the efficiency of fresh air replacement.

[0033] See Figure 6 Specifically, the interior of the main housing 1 is not a single cavity, but rather is vertically divided into a lower return air cavity and an upper fresh air connection cavity by an integrally formed or welded folded plate structure 13 (physical partition). The lower equipment return air inlet 112 area forms an open negative pressure return air cavity, which is directly connected to the return air end of the fresh air unit through a duct. Due to the strong suction generated by the fresh air unit when it is working, the indoor polluted air is quickly drawn into this cavity through the louvers at the bottom of the return air panel 2 and directly extracted. This process has a short path and low resistance, effectively ensuring high efficiency of indoor exhaust. The upper area, on the other hand, constructs a relatively closed fresh air connection cavity through the folded plate structure 13. The folded plate is designed in the form of a wrap-around or L-shaped guide plate, which tightly connects the fresh air intake 12 connected to the outside and the equipment fresh air inlet 111 connected to the intake end of the unit, and completely isolates it from the lower return air cavity in terms of physical space. The core technical advantage of this structural design lies in preventing airflow short-circuiting. Without this folding plate structure 13, the main unit's fresh air intake would likely directly draw in indoor return air, which is closer and has less resistance, causing the machine to run idly without introducing fresh outdoor air. Through the forced isolation provided by the folding plate structure 13, a forced airflow closed loop is established, from the outdoor air intake 12, through the fresh air connecting cavity and filter, and finally into the main unit via the equipment's fresh air inlet 111, ensuring that every cubic meter of air entering the main unit originates from the outdoors. Furthermore, the fresh air connecting cavity effectively acts as a small static pressure box when the airflow is flowing at high speed, allowing the high-speed airflow introduced from the outdoors to slow down and stabilize here before evenly passing through the filter. This not only improves the filter's utilization efficiency but also significantly reduces wind noise. Simultaneously, since outdoor hot and cold air is introduced, the presence of the folding plate structure 13 effectively isolates the thermal bridge effect, preventing condensation from the upper cold air causing condensation in the lower return air cavity and avoiding the risk of condensate dripping.

[0034] See Figure 6In one embodiment, based on the three-port dual-loop structure of the aforementioned embodiments, an independent fresh air shut-off valve is installed at the fresh air intake 12 (the interface connecting to the outside) located in the upper region. Given that the upper fresh air connection chamber and the lower return air chamber are physically isolated in this solution, the shut-off valve is designed as a rotary damping valve installed at the inlet of the fresh air connection chamber. The valve's adjustment handle is designed on the side of the filter mounting bracket, allowing operation when the user removes the fresh air filter. This technical feature significantly improves the environmental adaptability of the dual-loop system. In normal mode, the valve is fully open, and the equipment normally introduces and filters fresh air; however, in special scenarios, such as when the fresh air unit's filter is depleted and has not been replaced, or when there is a sudden odor outdoors (such as the smell of neighboring renovations or barbecue smoke), the user can close the shut-off valve to physically cut off the entry path of the outdoor pollution source. At this time, although the fresh air intake of the fresh air equipment is still working, the equipment will not be able to draw in outdoor air (or will only maintain a very small amount of infiltration) because the source is cut off. This protects the indoor air environment from sudden outdoor pollution. At the same time, it provides a temporary airflow backflow prevention function for filter replacement and maintenance, preventing strong outdoor winds from flowing back into the room when the filter is removed.

[0035] See Figure 1 In one embodiment, the main housing 1 has an open end facing the room, and the return air panel 2 includes a panel body 22 and a plug-in frame 23. The plug-in frame 23 is connected to the panel body 22 and extends toward the main housing 1. Its external dimensions are adapted to the inner wall dimensions of the main housing 1. During installation, the plug-in frame 23 is inserted into the internal receiving cavity of the main housing 1 through the open end to form a sleeve structure.

[0036] See Figure 1 This embodiment details the mating structure between the panel and the housing. The return air panel 2 adopts a combination design of panel body 22 and plug-in frame 23. The plug-in frame 23 extends rearward and can be inserted into the opening end of the main housing 1 like a drawer, forming a deep fitting structure. The technical effect of this feature is that it significantly improves the airtightness and structural strength of the air outlet. Compared with a simple surface cover, the fitting structure can effectively prevent airflow from leaking from the side gaps, ensuring that all airflow must pass through the preset filter path. At the same time, the plug-in frame 23 itself provides a stable installation boundary for the filter, so that the panel completes the clamping and positioning of the internal components at the same time as it is installed, avoiding abnormal noise caused by loose components.

[0037] See Figure 3 and Figure 4In one embodiment, the edge of the return air panel 2 extends outward to form a limiting flange. When the insertion frame 23 is installed inside the main housing 1, the limiting flange abuts against the end face of the main housing 1. Based on the socket structure, in this embodiment, the edge of the return air panel 2 extends outward to form a limiting flange wider than the opening of the main housing 1. When the insertion frame 23 is pushed into the main housing 1 until it is in place, this flange will tightly abut against the end face of the main housing 1 or the wall surface. The technical effect of this feature is mainly reflected in the fault tolerance and aesthetics of the installation. In actual decoration, wall openings often have uneven edges or dimensional deviations. The limiting flange can perfectly cover these installation defects without the need for additional finishing treatment. At the same time, it plays a physical limiting role, preventing the panel from being excessively inserted into the housing, ensuring that the panel is flush and neat with the wall surface.

[0038] See Figure 2 and Figure 5 In one embodiment, the duct interface is an outwardly extending circular tube structure. A groove or retainer is provided inside the main housing 1 at the location where the filter assembly 3 is installed to facilitate fixing the filter assembly 3. This embodiment focuses on the universality of the interface and the ease of filter replacement. All duct interfaces are designed as standard outwardly extending circular tube structures to facilitate clamping connections with commercially available circular ventilation hoses. More importantly, a groove or retainer structure is pre-fabricated inside the main housing 1 at the location where the filter assembly 3 is installed. The technical advantage of this feature is that it enables foolproof filter installation and removal. The groove or retainer can precisely define the position of the filter, preventing airflow pressure from causing filter displacement or deformation. When replacing the filter, the user only needs to push the new filter along the groove or snap it into the retainer, without using any tools such as screwdrivers, further echoing the invention's original intention of convenient replacement.

[0039] See Figure 2 and Figure 5 In one embodiment, the fresh air intake 12 extends to the exterior wall of the building via a duct, and a rain cap and / or insect screen are installed at the end of the duct. This embodiment provides enhanced protection for the port connecting to the outside. The fresh air intake 12 extends to the outside of the building via a duct through the wall and is equipped with a rain cap and / or insect screen at the end. The technical advantage of this feature is to ensure the safe operation of the system around the clock. The rain cap effectively prevents rainwater from flowing back into the air intake along the duct, avoiding filter dampness and mold or moisture entering the fresh air unit and causing circuit failure; the insect screen blocks insects, rodents, leaves, and other debris from entering the duct system. This design constitutes the first line of physical defense for the system, significantly reducing the equipment failure rate caused by environmental factors.

[0040] See Figure 1In one embodiment, the main housing 1 and the return air panel 2 are circular or square. This embodiment provides diverse options for appearance, limiting the main housing 1 and the return air panel 2 to be either circular or square. The technical advantage of this feature is that it meets the adaptation needs of different decoration styles and installation environments. Square structures typically have a larger effective filtration area, suitable for modern minimalist styles or integrated ceiling installations; while circular structures have softer lines, and the corresponding wall opening construction (such as water drilling) is more convenient. This choice of shape allows the product to be widely used in various indoor scenarios such as homes and offices, improving the product's market compatibility and decorative appeal.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A fresh air indoor air outlet, characterized in that, It includes a main housing (1), a return air panel (2), and a filter assembly (3). The main housing (1) is embedded in a wall opening and has at least two duct interfaces. The duct interfaces include an equipment air inlet (11) and a fresh air intake (12). The equipment air inlet (11) is used to connect to the air inlet of the fresh air equipment, and the fresh air intake (12) is used to connect to the outside to introduce fresh air. The return air panel (2) is detachably installed on the indoor side of the main housing (1) and forms a receiving cavity with the main housing (1), and the filter assembly (3) is installed in the receiving cavity.

2. The fresh air indoor air outlet according to claim 1, characterized in that, The return air panel (2) is provided with a return air channel, and the return air channel is provided with a return air louver (21). The return air louver (21) is used to adjust the opening and closing angle to control the flow rate of air through the return air panel (2).

3. The fresh air indoor air outlet according to claim 1, characterized in that, The filter assembly (3) includes a first filter screen (31) and a second filter screen (32); the first filter screen (31) is disposed inside the main housing (1) in the flow channel corresponding to the air inlet (11) of the device; the second filter screen (32) is disposed inside the main housing (1) in the flow channel corresponding to the fresh air inlet.

4. The fresh air indoor air outlet according to claim 1, characterized in that, The number of duct interfaces is three, including the equipment air inlet (11) and the fresh air intake (12). The equipment air inlet (11) includes the equipment fresh air inlet (111) and the equipment return air inlet (112). The equipment fresh air inlet (111) is used to connect to the equipment's fresh air inlet to draw fresh air from the fresh air intake (12). The equipment return air inlet (112) is used to connect to the equipment's return air inlet to draw indoor return air.

5. The fresh air indoor air outlet according to claim 4, characterized in that, The equipment return air vent (112) is located below the fresh air intake vent (12) and the equipment fresh air inlet (111). The fresh air intake vent (12) and the equipment fresh air inlet (111) are arranged side by side. The main housing (1) is provided with a folded plate structure (13) corresponding to the fresh air intake vent (12) and the equipment fresh air inlet (111). The folded plate structure (13) and the main housing (1) form a connecting cavity for connecting the equipment fresh air inlet (111) and the fresh air intake vent (12).

6. The fresh air indoor air outlet according to claim 1, characterized in that, The main housing (1) has an opening facing the room. The return air panel (2) includes a panel body (22) and a plug-in frame (23). The plug-in frame (23) is connected to the panel body (22) and extends toward the main housing (1). Its external dimensions are adapted to the inner wall dimensions of the main housing (1). During installation, the plug-in frame (23) is inserted into the internal cavity of the main housing (1) through the opening to form a sleeve structure.

7. The fresh air indoor air outlet according to claim 6, characterized in that, The edge of the return air panel (2) extends outward to form a limiting flange. When the plug-in frame (23) is installed in the main housing (1), the limiting flange abuts against the end face of the main housing (1).

8. The fresh air indoor air outlet according to claim 1, characterized in that, The duct interface is an outwardly extending circular tube structure. The main housing (1) has a groove or seat inside corresponding to the position where the filter assembly (3) is installed, so as to fix the filter assembly (3).

9. The fresh air indoor air outlet according to claim 4, characterized in that, The fresh air intake (12) extends to the exterior wall of the building through a pipe, and a rain cap and / or insect net are installed at the end of the pipe.

10. The fresh air indoor air outlet according to claim 1, characterized in that, The main housing (1) and the return air panel (2) are circular or square.

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