A fresh air system and a heat exchange structure thereof

Abstract

The application discloses a fresh air system and a heat exchange structure thereof, and relates to the technical field of fresh air systems, which is characterized by a shell and a cover connected to the shell by bolts, a plurality of auxiliary mounting plates fixedly installed on the inner wall of the shell, indoor air filter screen structures and outdoor air filter screen structures arranged on the auxiliary mounting plates, and the structures of the indoor air filter screen structures and the outdoor air filter screen structures being completely identical. The application enables the air filter screen to generate continuous and moderate vibration when air flows through the screen, realizes self-cleaning, and reduces the risk of filter screen blockage. Meanwhile, the repeated deformation of the elastic film intermittently impacts the total heat exchange core, generates micro-vibration to shake off dust, and combines with the built-in air cavity buffer to balance the cleaning and protection of the core body. In addition, the elastic film is installed in cooperation with the aging-resistant sealant to replace the traditional rigid fixation, improve the sealing performance, reduce air leakage, and effectively improve the system ventilation efficiency and energy recovery effect.

Description

Technical Field

[0001] This invention relates to the field of fresh air system technology, specifically to a fresh air system and its heat exchange structure. Background Technology

[0002] Fresh air systems are currently the core electromechanical systems for improving indoor air quality in residences, offices, medical facilities, and other places. Their core architecture typically integrates multi-stage filtration, energy recovery, intelligent air valves, and other functional modules. Through the coordinated operation of intake and exhaust fans, they actively introduce fresh air from the outdoor environment while directionally expelling polluted air accumulated indoors—including carbon dioxide produced by human metabolism, formaldehyde and TVOC (total volatile organic compounds) from renovations, cooking fumes, pet odors, dust particles, and other pollutants, achieving efficient replacement and circulation of indoor and outdoor air. In the air purification stage, the system uses a pre-filter to intercept hair and large dust particles, followed by medium-efficiency or even high-efficiency filters (such as HEPA filters) to remove fine pollutants such as PM2.5 and pollen. Some high-end models are also equipped with activated carbon filters to adsorb harmful gases. The total heat exchange core (made of paper, aluminum foil, or polymer materials) can recover the temperature and humidity energy in the exhaust air, pre-cooling fresh air in summer and pre-heating fresh air in winter, reducing the load on the air conditioning system by 15% - 30%, and ensuring that indoor temperature, humidity, oxygen content and other parameters strictly meet the relevant requirements of the "Code for Design of Heating, Ventilation and Air Conditioning of Civil Buildings" and the "Indoor Air Quality Standard".

[0003] In actual operation, the heat exchange structure (such as the total heat exchange core) inside the fresh air system casing faces the prominent problem of impurity blockage. To address this, the industry typically equips the air exchange structure with dedicated filters at both the inlet and outlet ends—an inlet-side filter to intercept outdoor impurities, and an outlet-side filter to filter impurities in the indoor exhaust air. The inlet and outlet-side filters are generally rigidly fixed to the mounting frame inside the casing using Phillips head bolts or plastic clips.

[0004] However, since traditional air intake and exhaust filters generally lack self-cleaning functions, impurities easily adhere to the filter holes of the air intake and exhaust filters during operation, causing filter blockage. Therefore, we propose a new type of fresh air system and its heat exchange structure. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a fresh air system and its heat exchange structure, which can effectively solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fresh air system and its heat exchange structure, comprising a housing and a cover bolted to the housing. Multiple auxiliary mounting plates are fixedly installed on the inner wall of the housing. Indoor air filter structures and outdoor air filter structures are provided on the auxiliary mounting plates, and the indoor and outdoor air filter structures are structurally identical. The indoor air filter structure includes a mounting frame fixedly installed on the auxiliary mounting plates. An elastic element is fixedly installed on the inner side of the mounting frame, and an air filter is provided on the side of the elastic element. The elastic element includes a fixed... An outer elastic membrane is fixedly installed inside the mounting frame, and an inner elastic membrane is fixedly installed inside the outer elastic membrane. An air cavity is opened inside the overlapping part of the inner elastic membrane. An air inlet pipe and an air outlet pipe are fixedly installed sequentially from top to bottom on the left side of the housing, and an air outlet pipe and an air inlet pipe are fixedly installed sequentially from top to bottom on the right side of the housing. An air inlet fan is provided at one end of the air inlet pipe and located inside the housing cavity, and an air outlet fan is provided at one end of the air outlet pipe and located inside the housing cavity. The output end of the air inlet fan is fixedly connected to the air inlet pipe and the output end of the air outlet fan is fixedly connected to the air outlet pipe.

[0007] Preferably, the auxiliary mounting plate is divided into a long mounting plate and a short mounting plate. A V-shaped groove is provided at one end of the auxiliary mounting plate away from the inner wall of the housing. A rubber V-block adapted to the V-shaped groove is fixedly installed on the inner side of the V-shaped groove.

[0008] Preferably, the air filter and the inner elastic membrane, and the outer elastic membrane and the mounting frame are all bonded together with an aging-resistant, high-adhesion sealant.

[0009] Preferably, the outer elastic membrane and the inner elastic membrane have different elastic degrees, wherein the elastic degree of the outer elastic membrane is less than that of the inner elastic membrane.

[0010] A heat exchange structure for a fresh air system includes a lower sealing plate, a total heat exchange core, and an upper sealing plate; the lower sealing plate is disposed inside a housing, the total heat exchange core is disposed on the lower sealing plate, and the upper sealing plate is movably mounted on top of the total heat exchange core.

[0011] Preferably, the lower sealing plate, the total heat exchange core, and the upper sealing plate are all adapted to and sealed with the rubber V-block; the total heat exchange core includes a base frame, on which a plurality of transversely corrugated heat exchange cores are fixedly installed, and an airflow partition plate is fixedly installed on the top of the transversely corrugated heat exchange cores, and a plurality of longitudinally corrugated heat exchange cores are fixedly installed on the top of the airflow partition plate; the transversely corrugated heat exchange cores, the airflow partition plate, and the longitudinally corrugated heat exchange cores are arranged alternately along the height direction of the base frame, and form at least one set of repeating stacked units.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up an elastic element that includes an outer elastic membrane and an inner elastic membrane, the air filter screen will generate continuous and moderate vibration when indoor and outdoor airflow passes through, which will effectively reduce the adhesion of impurities on the filter screen surface, realize the self-cleaning of the filter screen, and reduce the risk of filter screen clogging from the root.

[0013] 2. During the filter self-cleaning process, the repeated deformation of the outer elastic membrane and the inner elastic membrane will intermittently impact the total heat exchange core, causing it to vibrate slightly, thereby shaking off the dust inside the core to a certain extent and reducing the possibility of blockage in the core flow channel; at the same time, the air cavity set in the inner elastic membrane plays a buffering role, avoiding damage to the core structure from hard collisions, thus balancing the cleaning effect and the protection of the core.

[0014] 3. By using an installation method that combines an elastic membrane with an aging-resistant sealant, instead of traditional bolts or clips, the system ensures a tight bond between the air filter and the mounting frame, while improving the sealing performance. This effectively reduces air leakage caused by rigid installation gaps, thereby enhancing the system's ventilation efficiency and energy recovery effect. Attached Figure Description

[0015] Figure 1 This is a complete structural schematic diagram of the present invention; Figure 2 For the present invention Figure 1 Internal structure diagram; Figure 3 For the present invention Figure 2 Another perspective structural diagram; Figure 4 For the present invention Figure 3 Another perspective structural diagram; Figure 5 These are schematic diagrams of the indoor air filter structure and the outdoor air filter structure of the present invention. Figure 6 This is a cross-sectional schematic diagram of the indoor air filter structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A above; Figure 8 This is a schematic diagram of the planar structure of the indoor air filter of the present invention; Figure 9 This is a schematic diagram of the structure of the total heat exchange core of the present invention; Figure 10 For the present invention Figure 9 A magnified structural diagram of point B above.

[0016] In the picture: 1. Housing; 2. Auxiliary mounting plate; 3. Indoor air filter structure; 31. Mounting frame; 32. Elastic component; 321. Outer elastic membrane; 322. Inner elastic membrane; 323. Air cavity; 33. Air filter; 4. Outdoor air filter structure; 5. V-shaped groove; 6. Rubber V-block; 7. Inlet duct one; 8. Outlet duct one; 9. Outlet duct two; 10. Inlet duct two; 11. Inlet fan; 12. Outlet fan; 13. Lower sealing plate; 14. Total heat exchange core; 141. Base frame; 142. Transverse corrugated heat exchange core; 143. Airflow partition plate; 144. Longitudinal corrugated heat exchange core; 15. Upper sealing plate. Detailed Implementation

[0017] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0018] This invention provides a technical solution: Please see Figures 1-10 A fresh air system includes a housing 1 and a cover bolted to the housing 1. Multiple auxiliary mounting plates 2 are fixedly installed on the inner wall of the housing 1. Indoor air filter structure 3 and outdoor air filter structure 4 are provided on the auxiliary mounting plates 2, and the structures of the indoor air filter structure 3 and the outdoor air filter structure 4 are identical. The indoor air filter structure 3 includes a mounting frame 31 fixedly installed on the auxiliary mounting plates 2. An elastic element 32 is fixedly installed on the inner side of the mounting frame 31, and an air filter 33 is provided on the side of the elastic element 32. The elastic element 32 includes an outer elastic membrane 321 fixedly installed on the inner side of the mounting frame 31, and an inner elastic membrane 322 fixedly installed on the inner side of the outer elastic membrane 321. An air cavity 323 is formed inside the overlapping portion of the inner elastic membrane 322 and the air filter 33.

[0019] The housing 1 and the cover connected by bolts constitute the basic installation structure. The auxiliary mounting plate 2 on the inner wall of the housing 1 provides installation support for the indoor air filter structure 3 and the outdoor air filter structure 4 (both have the same structure). In the initial state, the indoor air filter structure 3 and the outdoor air filter structure 4 do not contact the heat exchange core 14 and there is a gap between them. The mounting frame 31 in the indoor air filter structure 3 is fixed on the auxiliary mounting plate 2. The elastic element 32 on its inner side cooperates with the air filter 33. When the airflow passes through, it drives the air filter 33 to generate continuous and moderate vibration, so as to achieve self-cleaning of the filter and reduce the risk of blockage.

[0020] Please see Figures 1-4On the left side of the housing 1, from top to bottom, an air inlet pipe 7 and an air outlet pipe 8 are fixedly installed. On the right side of the housing 1, from top to bottom, an air outlet pipe 9 and an air inlet pipe 10 are fixedly installed. An air inlet fan 11 located inside the housing 1 is provided at one end of the air inlet pipe 7. An air outlet fan 12 located inside the housing 1 is provided at one end of the air outlet pipe 9. The output end of the air inlet fan 11 is fixedly connected to the air inlet pipe 7, and the output end of the air outlet fan 12 is fixedly connected to the air outlet pipe 9.

[0021] The controller (visible from the outside of housing 1 in the diagram) synchronously starts the exhaust fan 12 and the intake fan 11. The exhaust fan 12 generates negative pressure to draw indoor polluted air into housing 1 through exhaust duct 18, and after treatment, it is discharged outdoors through exhaust duct 29. The intake fan 11 generates suction to draw outdoor fresh air into housing 1 through intake duct 20, and after purification and heat exchange, it is sent into the room through intake duct 17. These components form a stable airflow channel, clearly defining the flow direction of fresh air and exhaust air, avoiding airflow mixing, and working together to achieve efficient indoor and outdoor air exchange. This provides airflow power for filter self-cleaning and energy recovery of the total heat exchange core 14, ensuring the system's ventilation efficiency and air exchange effect.

[0022] Please see Figures 1-3 and Figure 5 The auxiliary mounting plate 2 is divided into a long mounting plate and a short mounting plate. A V-shaped groove 5 is provided at one end of the auxiliary mounting plate 2 away from the inner wall of the housing 1. A rubber V-block 6 that is compatible with the V-shaped groove 5 is fixedly installed on the inner side of the V-shaped groove 5.

[0023] During operation, the auxiliary mounting plate 2 provides mounting support for the filter structure and the total heat exchange core 14. The cooperation between the V-shaped groove 5 and the rubber V-block 6 enhances the sealing of the installation point, preventing airflow from flowing back and forth in the casing 1 and causing air leakage. This ensures that indoor and outdoor air can efficiently complete energy exchange in the total heat exchange core 14, while also ensuring that the sealing of the total heat exchange core 14 is not affected by micro-vibration, thereby improving the system's ventilation efficiency and heat exchange stability.

[0024] In some embodiments, the air filter 33 is bonded to the inner elastic membrane 322, and the outer elastic membrane 321 is bonded to the mounting frame 31 using an aging-resistant, high-adhesion sealant.

[0025] In this embodiment, during installation, the air filter 33 is bonded and fixed to the inner elastic membrane 322 and the outer elastic membrane 321 is bonded and fixed to the mounting frame 31 with an aging-resistant, high-adhesion sealant. During operation, it acts synchronously with the deformation of the elastic element 32, replacing the traditional rigid fixation, greatly improving the sealing performance of the connection and reducing air leakage and airflow cross-flow.

[0026] In some embodiments, the elasticity of the outer elastic membrane 321 and the inner elastic membrane 322 is different, wherein the elasticity of the outer elastic membrane 321 is less than that of the inner elastic membrane 322.

[0027] In this embodiment, when airflow passes through, the outer elastic membrane 321 has less elasticity than the inner elastic membrane 322, resulting in differential deformation between the two. This causes the air filter 33 to vibrate continuously and moderately, achieving self-cleaning of the filter and reducing clogging. The inner elastic membrane 322, with its greater deformation, can accurately impact the total heat exchange core 14, causing it to vibrate slightly and shake off dust. Combined with the buffering effect of the air chamber 323, this approach balances cleaning and core protection.

[0028] Please see Figures 2-4 , Figure 9 and Figure 10 A heat exchange structure for a fresh air system includes a lower sealing plate 13, a total heat exchange core 14, and an upper sealing plate 15. The lower sealing plate 13 is disposed inside the housing 1, the total heat exchange core 14 is disposed on the lower sealing plate 13, and the upper sealing plate 15 is movably installed on the top of the total heat exchange core 14. The lower sealing plate 13, the total heat exchange core 14, and the upper sealing plate 15 are all adapted to and sealed with a rubber V-block 6. The total heat exchange core 14 includes a base frame 141, on which several transversely corrugated heat exchange cores 142 are fixedly installed. An airflow partition plate 143 is fixedly installed on the top of the transversely corrugated heat exchange cores 142, and several longitudinally corrugated heat exchange cores 144 are fixedly installed on the top of the airflow partition plate 143. The transversely corrugated heat exchange cores 142, the airflow partition plate 143, and the longitudinally corrugated heat exchange cores 144 are arranged alternately along the height direction of the base frame 141, forming at least one set of repeating stacked units.

[0029] When the heat exchange structure is in operation, the lower sealing plate 13, the total heat exchange core 14, and the upper sealing plate 15 are fitted and sealed with the rubber V-block 6, forming a stable sealing structure after the cover is pressed tight. The indoor exhaust air flows through the transverse corrugated heat exchange core 142 channel in the total heat exchange core 14, while the fresh air flows through the longitudinal corrugated heat exchange core 144 channel. The airflow separator 143 separates the two airflows, and the staggered stacked cores expand the heat exchange area, achieving efficient recovery of temperature, humidity, and energy. When the total heat exchange core 14 is impacted by the inner elastic membrane 322 and generates micro-vibrations (internal core vibration), the sealing structure is unaffected, and dust can be shaken off to prevent clogging. The lower sealing plate 13 and the upper sealing plate 15 play a role in fixing and protecting the core. During disassembly and assembly, the upper sealing plate 15 can be removed to replace the core, balancing heat exchange efficiency, cleaning convenience, and maintenance ease, ensuring stable system operation.

[0030] In practical use, the working principle of this invention is as follows: First, the entire fresh air system is securely installed on the wall using ceiling-mounted components. Simultaneously, corresponding delivery pipes are connected to the inlet duct 1 (7), outlet duct 1 (8), outlet duct 2 (9), and inlet duct 2 (10). The delivery pipe of inlet duct 1 (7) extends into the target indoor space and has a suitable outlet for supplying fresh air. The delivery pipe of outlet duct 1 (8) is also located indoors to extract stale air. The delivery pipes of outlet duct 2 (9) and inlet duct 2 (10) extend directly to the outside, respectively responsible for exhausting indoor air and introducing outdoor fresh air. Throughout the installation process, the auxiliary mounting plate 2 on the inner wall of the casing 1, through the matching structure of the V-shaped groove 5 and the rubber V-block 6, provides a sealed foundation for the subsequent installation of the filter structure and the total heat exchange core 14, and also reserves reasonable space for the micro-vibration of the core components.

[0031] When indoor ventilation is required, the controller outside the casing 1 synchronously starts the exhaust fan 12 and the intake fan 11 to achieve synchronous replacement of indoor and outdoor air. The exhaust fan 12 generates negative pressure, drawing indoor polluted air into the casing 1 through the delivery pipe of the exhaust duct 1 8. This air first flows through the indoor air filter structure 3, where the air filter 33 filters out impurities (the filtered air still contains a small amount of impurities). The filtered indoor exhaust air continues to flow through the dedicated flow channel formed by the transverse corrugated heat exchange core 142 and the airflow partition plate 143 in the total heat exchange core 14. During this process, the total heat exchange core 14 efficiently retains the temperature and humidity energy of the indoor exhaust air. In summer, the low temperature and low humidity exhaust air retains the cold and humidity in the core, while in winter, it retains the heat and humidity to pre-cool or preheat the fresh air introduced later, thereby maintaining stable indoor temperature and humidity and reducing the load on the air conditioning system. Finally, this exhaust air that has completed energy recovery is discharged to the outside through the delivery pipe of the exhaust duct 2 9 under the action of the exhaust fan 12.

[0032] At the same time, the intake fan 11 operates to generate suction, drawing fresh outdoor air into the casing 1 through the conveying pipe of the second intake duct 10. The outdoor air first passes through the outdoor air filter structure 4, and the air filter 33 filters out impurities in the outdoor air. Then it flows through the flow channel formed by the longitudinal wave heat exchange core 144 and the airflow partition plate 143 in the total heat exchange core 14, fully absorbing the temperature and humidity energy left in the core of the previous indoor exhaust air, realizing the temperature and humidity regulation of the fresh air (absorbing cold energy and humidity in summer to become cool and humid, absorbing heat energy and humidity in winter to become warm and suitable). Finally, it is sent into the room through the conveying pipe of the first intake duct 7 and the air outlet, completing the entire indoor air replacement cycle.

[0033] When airflow passes through the air filter 33, it causes the elastic element 32 to deform. Due to the elastic difference between the outer elastic membrane 321 and the inner elastic membrane 322, the air filter 33 will generate continuous and moderate vibration (the vibration amplitude of the air filter 33 is also related to the mesh size of the air filter 33; the higher the mesh size, the greater the vibration amplitude). This vibration can effectively reduce the adhesion of impurities in the air to the filter pores, reducing the risk of filter clogging at the source. At the same time, the inner elastic membrane 322 deforms more under the action of wind (ensuring that it can impact the total heat exchange core 14). Its internal pre-inflated elliptical air cavity 323 will directly impact the total heat exchange core 14. The total heat exchange core 14 is sealed and clamped to the rubber V-block 6 of the auxiliary mounting plate 2 through the lower sealing plate 13, the upper sealing plate 15, and the auxiliary mounting plate 2, and is an interference fit. The impact force will cause the total heat exchange core 14 to generate The slight vibration (which does not affect the sealing performance) shakes off the fine dust adhering to the surface of the core, reducing the possibility of blockage in the core flow channel and extending the service life of the total heat exchange core 14 to a certain extent. The air chamber 323's inflation design avoids direct hard collision between the air filter 33 and the total heat exchange core 14, effectively protecting the core from damage and preventing it from being deformed due to collision, thus affecting the heat exchange efficiency. (The impact on the total heat exchange core 14 causes almost no movement, but force is transmitted near the impact surface. The force propagates into the interior and around the total heat exchange core 14 in the form of "longitudinal waves and transverse waves," causing the internal core to vibrate, which helps to reduce dust. The lower sealing plate 13, the total heat exchange core 14, and the upper sealing plate 15 around it, together with the rubber V-block 6, provide buffer protection for the total heat exchange core 14 and also achieve a seal, ensuring that there is no air leakage.)

[0034] Furthermore, addressing the issues of poor sealing performance and easy air leakage caused by the rigid fixing of traditional filters using cross bolts or plastic clips, this device improves the sealing performance to a certain extent by optimizing the fixing structure: the air filter 33 is bonded to the inner elastic membrane 322, and the outer elastic membrane 321 is bonded to the mounting frame 31 using aging-resistant, high-adhesion sealant. Combined with the elastic fit of the outer elastic membrane 321, air leakage at the filter installation point is reduced. At the same time, the matching and sealing snap-fit ​​between the total heat exchange core 14 and the rubber V block 6, as well as the sealing coverage of the upper and lower ends of the core by the lower sealing plate 13 and the upper sealing plate 15, further prevent airflow from flowing back and forth inside the casing 1 and causing air leakage. This ensures that indoor exhaust air and outdoor fresh air achieve energy exchange in the total heat exchange core 14, and the airflow mixing will not affect the ventilation quality and heat exchange effect.

[0035] When the heat exchange core 14 needs to be replaced after a period of use, simply unscrew the bolts on the cover, remove the cover, and then remove the upper sealing plate 15 to easily remove the old heat exchange core 14. After replacing it with a new heat exchange core 14, reposition the upper sealing plate 15 and tighten the cover. The cover will exert a stable pressure on the heat exchange core 14, the upper sealing plate 15, and the lower sealing plate 13, ensuring good sealing performance after replacement and preventing subsequent air leakage problems caused by disassembly and reassembly. Throughout the entire operation, the synergistic effect of filter self-cleaning and anti-clogging, micro-vibration dust removal of the heat exchange core 14, and multiple sealing to prevent air leakage effectively solves the core defects of traditional fresh air systems, balancing ventilation efficiency, filtration effect, heat exchange stability, and component lifespan.

[0036] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A fresh air system, comprising a housing (1) and a cover bolted to the housing (1), characterized in that, Multiple auxiliary mounting plates (2) are fixedly installed on the inner wall of the housing (1). An indoor air filter structure (3) and an outdoor air filter structure (4) are provided on the auxiliary mounting plates (2). The structures of the indoor air filter structure (3) and the outdoor air filter structure (4) are completely identical. The indoor air filter structure (3) includes a mounting frame (31) fixedly mounted on an auxiliary mounting plate (2), an elastic element (32) is fixedly mounted on the inner side of the mounting frame (31), and an air filter (33) is provided on the side of the elastic element (32). The elastic element (32) includes an outer elastic membrane (321) fixedly installed inside the mounting frame (31), and an inner elastic membrane (322) fixedly installed inside the outer elastic membrane (321). An air cavity (323) is opened inside the overlapping part of the inner elastic membrane (322) and the air filter (33). On the left side of the housing (1), from top to bottom, an air inlet pipe (7) and an air outlet pipe (8) are fixedly installed in sequence. On the right side of the housing (1), from top to bottom, an air outlet pipe (9) and an air inlet pipe (10) are fixedly installed in sequence. One end of the air inlet pipe (7) is provided with an air inlet fan (11) located in the inner cavity of the housing (1). One end of the air outlet pipe (9) is provided with an air outlet fan (12) located in the inner cavity of the housing (1). The output end of the air inlet fan (11) is fixedly connected to the air inlet pipe (7), and the output end of the air outlet fan (12) is fixedly connected to the air outlet pipe (9).

2. The fresh air system according to claim 1, characterized in that: The auxiliary mounting plate (2) is divided into a long mounting plate and a short mounting plate. A V-shaped groove (5) is provided at one end of the auxiliary mounting plate (2) away from the inner wall of the housing (1). A rubber V-block (6) that is compatible with the V-shaped groove (5) is fixedly installed on the inner side of the V-shaped groove (5).

3. A fresh air system according to claim 1, characterized in that: The air filter (33) and the inner elastic membrane (322), and the outer elastic membrane (321) and the mounting frame (31) are all bonded together with an aging-resistant, high-adhesion sealant.

4. A fresh air system according to claim 1, characterized in that: The elasticity of the outer elastic membrane (321) and the inner elastic membrane (322) are different, with the elasticity of the outer elastic membrane (321) being less than that of the inner elastic membrane (322).

5. A heat exchange structure for use in a fresh air system according to any one of claims 1-4, characterized in that, It includes a lower sealing plate (13), a total heat exchange core (14), and an upper sealing plate (15); the lower sealing plate (13) is disposed inside the housing (1), the total heat exchange core (14) is disposed on the lower sealing plate (13), and the upper sealing plate (15) is movably installed on the top of the total heat exchange core (14).

6. A heat exchange structure according to claim 5, characterized in that: The lower sealing plate (13), the total heat exchange core (14), and the upper sealing plate (15) are all adapted to and sealed with the rubber V-block (6); the total heat exchange core (14) includes a base frame (141), on which a plurality of transverse corrugated heat exchange cores (142) are fixedly installed, and an airflow partition plate (143) is fixedly installed on the top of the transverse corrugated heat exchange cores (142), and a plurality of longitudinal corrugated heat exchange cores (144) are fixedly installed on the top of the airflow partition plate (143); the transverse corrugated heat exchange cores (142), the airflow partition plate (143), and the longitudinal corrugated heat exchange cores (144) are arranged alternately along the height direction of the base frame (141) and form at least one set of repeating stacked units.

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