Fresh air machine

Abstract

The application relates to the field of ventilation equipment, in particular to a fresh air machine which comprises a shell, a cover plate, a heat exchange core, an exhaust fan, a supply fan and at least two filter screens, a side of the shell is provided with an air inlet and an exhaust outlet at intervals, another side of the shell is provided with an air return outlet and an air supply outlet at intervals, the heat exchange core is connected to the inner cavity wall of the shell, the exhaust fan is connected to the inner wall of the shell close to the exhaust outlet, the supply fan is connected to the inner wall of the shell close to the air supply outlet, at least two sliding cavities for the filter screens to slide are provided on the surface of the shell at intervals, the sliding cavities are communicated with the inner cavity of the shell, one of the filter screens is located on the side of the heat exchange core facing the air inlet, and the other filter screen is located on the side of the heat exchange core facing the air return outlet; the cover plate is rotationally connected to the surface of the shell and covers the sliding cavities. In the application, the cover plate is arranged, the filter screen and the shell are separated, the filter screen is convenient to replace and clean, and the user's convenience in using the fresh air machine is improved.

Description

Technical Field

[0001] This application relates to the field of ventilation equipment, and in particular to a fresh air unit. Background Technology

[0002] A fresh air system is a device that uses mechanical ventilation to exchange and purify indoor and outdoor air. It mainly introduces fresh air, exhausts polluted air, and filters and sterilizes the air to improve indoor air quality.

[0003] The existing fresh air purifier mainly includes a casing, with air inlets and outlets on opposite sides. A heat exchange core is installed on the inner wall of the casing. The air in the air inlet is exchanged through the heat exchange core and then discharged from the air outlet. A filter screen is installed on the inner wall of the casing facing the air inlet, which can filter impurities in the air.

[0004] Because the filter is embedded and fixed inside the housing, it is inconvenient for users to clean and replace the filter, thus reducing the ease of use of the fresh air unit. Summary of the Invention

[0005] To improve the ease of use of fresh air systems, this application provides a fresh air system.

[0006] This application provides a fresh air ventilator, which adopts the following technical solution:

[0007] A fresh air ventilator includes a housing, a cover plate, a heat exchange core, an exhaust fan, a supply fan, and at least two filters. An air inlet and an exhaust outlet are spaced apart on one side of the housing, and the inner cavity of the housing connects the air inlet and the exhaust outlet. A return air inlet and a supply air inlet are spaced apart on the other side of the housing, and the inner cavity of the housing connects the return air inlet and the supply air inlet. The heat exchange core is connected to the inner wall of the housing cavity. The exhaust fan is connected to the inner wall of the housing near the exhaust outlet. The supply fan is connected to the inner wall of the housing near the supply air inlet. At least two sliding cavities for sliding the filters are spaced apart on the surface of the housing, and the sliding cavities connect to the inner cavity of the housing. One filter is located on the side of the heat exchange core facing the air inlet, and the other filter is located on the side of the heat exchange core facing the return air inlet. The cover plate is rotatably connected to the surface of the housing and covers the sliding cavities.

[0008] By adopting the above technical solution, when the fresh air unit is in use, the supply fan and exhaust fan operate. Outdoor air enters the inner cavity of the casing through the air inlet, passes through the filter and heat exchange core in sequence, and then enters the room through the air outlet, achieving a directional supply of fresh air to the room. At the same time, indoor air enters the inner cavity of the casing through the return air inlet, passes through the filter and heat exchange core in sequence, and then enters the outside through the exhaust outlet, achieving the exchange of fresh and old air in the room and purifying the indoor air environment. When the staff needs to clean or replace the filter, the cover plate is driven to rotate away from the casing. The sealing effect of the cover plate on the sliding cavity disappears, and the filter is driven to slide along the inner wall of the sliding cavity away from the casing, realizing the separation of the filter and the casing. This facilitates the replacement and cleaning of the filter, thereby improving the ease of use of the fresh air unit for users.

[0009] Optionally, the inner wall of the sliding cavity is connected to a limiting component, which includes a limiting plate and a limiting bolt. The inner wall of the sliding cavity near the cover plate has a limiting cavity for the limiting plate to be embedded. The end of the limiting bolt passes through the surface of the limiting plate and is threaded and fixed to the inner wall of the limiting cavity. The surface of the limiting plate and the bottom wall of the sliding cavity clamp the two sides of the filter screen to form a limiting.

[0010] By adopting the above technical solution, during filter installation, the end of the filter is embedded in the sliding cavity and slides along the inner wall of the sliding cavity towards the housing. The end of the filter abuts against the bottom wall of the sliding cavity. At the same time, the limiting plate is embedded in the limiting cavity. The surface of the limiting plate abuts against the end face of the filter away from the bottom wall of the sliding cavity. The end of the limiting bolt passes through the surface of the limiting plate and is threaded and fixed to the inner wall of the limiting cavity. The surface of the limiting plate and the bottom wall of the sliding cavity clamp the two sides of the filter to form a limiting position, making it difficult for the filter to shift in the sliding cavity, thereby improving the limiting stability of the filter in the sliding cavity.

[0011] Optionally, the surface of the housing facing the cover plate has a closed cavity for the end of the cover plate to be inserted. When the cover plate rotates toward the sliding cavity, the end of the cover plate is inserted into the closed cavity, the surface of the cover plate is flush with the surface of the housing, and the surface of the cover plate abuts against the surface of the housing and closes the sliding cavity.

[0012] By adopting the above technical solution, before the fresh air unit is used, the cover plate is driven to rotate towards the sliding cavity, the end of the cover plate is embedded in the closed cavity, the surface of the cover plate is flush with the surface of the shell, and the surface of the cover plate presses against the surface of the shell and closes the sliding cavity, thereby realizing the directional opening and closing of the sliding cavity.

[0013] Optionally, the housing is connected to a fixing assembly, which includes a fixing post. The inner wall of the closed cavity facing the end of the cover plate has a fixing cavity for the fixing post to be embedded in. The fixing cavity communicates with the inner cavity of the housing. The end face of the cover plate has a fixing groove for the end of the fixing post to be embedded in. The end of the fixing post protruding from the inner wall of the closed cavity has a guide surface. The guide surface is arc-shaped and can abut against the end face of the cover plate and guide the end of the fixing post to be embedded in the fixing groove.

[0014] By adopting the above technical solution, when the cover plate rotates towards the direction of the shell, the end of the cover plate is embedded in the fixed cavity. The guide surface is in the shape of a circular arc protrusion. The guide surface abuts against the end face of the cover plate and guides the end of the fixed column to be embedded in the fixed groove. The outer circumferential surface of the fixed column abuts against the inner wall of the fixed groove to form a limit, making it difficult for the end of the cover plate to detach from the fixed cavity, thereby improving the connection stability between the cover plate and the shell.

[0015] Optionally, the fixing assembly further includes a fixing plate and an elastic element. The cover plate has a slide rail for sliding the fixing plate on its surface facing the closed cavity. The closed cavity has a closing groove for the end of the cover plate to be embedded in the inner wall of the slide rail. One end of the elastic element is connected to the surface of the fixing plate in the elastic direction, and the other end of the elastic element is connected to the inner wall of the slide rail. The elastic element has the elastic force to drive the fixing plate to slide towards the closing groove, and the end of the fixing plate tends to be embedded in the closing groove.

[0016] By adopting the above technical solution, when the cover plate rotates towards the direction of the shell and the end of the cover plate is embedded in the closed cavity, the slide connects to the closed groove, and the elastic element drives the fixed plate to slide towards the direction of the closed groove. The end of the fixed plate is embedded in the closed groove, and the surface of the fixed plate abuts against the inner wall of the closed groove to form a limit, making it difficult for the end of the cover plate to detach from the closed cavity, thereby improving the stability of the cover plate in sealing the sliding cavity.

[0017] Optionally, a sealing airbag is connected to the inner wall of the closed cavity, and the cover plate and the inner wall of the closed cavity clamp the two sides of the sealing airbag to form a seal.

[0018] By adopting the above technical solution, when the end of the cover plate is embedded in the closed cavity, the cover plate surface and the inner wall of the closed cavity clamp the two sides of the sealing airbag to form a seal, making it difficult for the air in the sliding cavity to escape from the tight joint between the cover plate and the inner wall of the closed cavity, thereby improving the sealing performance of the shell.

[0019] Optionally, the housing is connected to a sealing assembly, which includes a push-pull plate and multiple sealing blocks. The cover plate has a push-pull cavity for the push-pull plate to slide. The push-pull cavity has multiple sealing cavities for the sealing blocks to slide on the inner wall of the sealing airbag. The sealing cavities penetrate the cover plate and face the sealing airbag. One end of the sealing block faces the surface of the sealing airbag, and the other end of the sealing block is connected to the push-pull plate. When the push-pull plate slides along the inner wall of the push-pull cavity towards the sealing airbag, it drives the sealing block to slide along the inner wall of the sealing cavity towards the sealing airbag. The end face of the sealing block compresses and deforms the surface of the sealing airbag.

[0020] By adopting the above technical solution, when the end of the cover plate is embedded in the closed cavity, the sealing cavity faces the surface of the sealing airbag, driving the push-pull plate to slide along the inner wall of the push-pull cavity toward the surface close to the sealing airbag, and driving the sealing block to slide along the inner wall of the sealing cavity toward the direction close to the sealing airbag. The end face of the sealing block squeezes the surface of the sealing airbag to deform, increasing the pressure point on the sealing airbag. The inner wall of the closed cavity and the surface of the cover plate press against both sides of the sealing airbag to form a seal, further improving the sealing stability of the fresh air unit.

[0021] Optionally, the sealing assembly further includes an elastic element two and a push-pull piston. The end face of the cover plate is provided with a push-pull groove for the push-pull piston to slide. The sliding direction of the push-pull piston is perpendicular to the sliding direction of the push-pull plate. The push-pull groove communicates with the push-pull cavity and is located on the side of the push-pull plate away from the sealing block. The end face of the push-pull plate that abuts against the push-pull piston is provided with a guide surface. The inclination height of the guide surface increases as the distance to the sealing block decreases. One end of the elastic element two in the elastic direction is connected to the surface of the push-pull plate, and the other end of the elastic element two in the elastic direction is connected to the inner wall of the push-pull cavity. The elastic element two has the elastic force to drive the push-pull plate to slide away from the sealing airbag. The end face of the sealing block is flush with the surface of the cover plate, and the guide surface abuts against the end face of the push-pull piston and guides the push-pull piston to slide away from the cover plate.

[0022] By adopting the above technical solution, the elastic element drives the push-pull plate to slide away from the sealing airbag. The end face of the sealing block is flush with the surface of the cover plate, and the guide surface abuts against the end face of the push-pull piston and guides the push-pull piston to slide away from the cover plate, thereby realizing the storage of the sealing block and making the sealing block less susceptible to damage from external impacts, thus extending the service life of the fresh air unit. When the end of the cover plate is embedded in the closed cavity, it drives the push-pull piston to slide along the inner wall of the push-pull groove towards the push-pull cavity. The guide surface abuts against the surface of the push-pull piston and guides the push-pull plate to slide along the inner wall of the push-pull cavity towards the sealing airbag, which in turn drives the sealing block to slide along the inner wall of the sealing cavity towards the sealing airbag. The end of the sealing block protruding from the cover plate squeezes the sealing airbag to deform, thereby realizing the directional sliding of the push-pull plate.

[0023] Optionally, the sealing assembly further includes an elastic plate and a connecting rope. The inner wall of the fixing groove has a connecting cavity for the end of the elastic plate to slide. The end of the elastic plate protruding from the connecting cavity is connected to the inner wall of the fixing groove. The connecting cavity communicates with the push-pull cavity. One end of the connecting rope is connected to the surface of the elastic plate, and the other end of the connecting rope is connected to the surface of the push-pull piston. The connecting rope between the push-pull piston and the elastic plate is in a taut state. When the end of the fixing post is embedded in the fixing groove, the guide surface abuts against the surface of the elastic plate and drives the end of the elastic plate to slide away from the push-pull cavity. The connecting rope receives the power of the elastic plate and drives the push-pull piston to slide along the inner wall of the push-pull groove towards the push-pull cavity.

[0024] By adopting the above technical solution, one end of the elastic plate is connected to the inner wall of the fixed groove, and the other end of the elastic plate slides on the inner wall of the connecting cavity. The connecting rope between the push-pull piston and the elastic plate is in a taut state. When the end of the fixed column is embedded in the fixed groove, the guide surface abuts against the surface of the elastic plate, and the surface of the elastic plate is deformed under pressure. At the same time, it drives the end of the elastic plate to slide away from the push-pull cavity along the inner wall of the connecting cavity. The connecting rope receives the power of the elastic plate and drives the push-pull piston to slide closer to the push-pull cavity along the inner wall of the push-pull groove. The guide surface abuts against the end face of the push-pull piston and guides the push-pull plate to slide closer to the sealing airbag along the inner wall of the push-pull cavity. This drives the sealing block to slide closer to the sealing airbag along the inner wall of the sealing cavity. The end of the sealing block protruding from the cover plate squeezes the surface of the sealing airbag, realizing the automated sliding of the push-pull plate without the need for manual control by the staff, further improving the ease of use of the fresh air unit for the staff.

[0025] Optionally, the sealing assembly further includes a sealing piston and an elastic element three. The inner wall of the closed cavity is provided with an inflation channel for the sealing piston to slide. The inflation channel is connected to the inner cavity of the sealing airbag. One end of the elastic element three in the elastic direction is connected to the inner wall of the inflation channel, and the other end of the elastic element three in the elastic direction is connected to the end face of the sealing piston. The elastic element three has the elastic force to drive the sealing piston to slide away from the inflation channel, and the end of the sealing piston tends to protrude from the inner wall of the closed cavity. The end of the sealing piston protruding from the inner wall of the closed cavity is provided with a buffer surface. The buffer surface is arc-shaped and convex. The guide surface can abut against the end face of the push-pull piston and guide the sealing piston to slide closer to the inflation channel.

[0026] By adopting the above technical solution, when the push-pull piston slides along the inner wall of the push-pull groove toward the direction of the push-pull cavity, the buffer surface abuts against the end face of the push-pull piston and guides the sealing piston to slide toward the direction of the airflow channel. The end face of the sealing piston is flush with the inner wall of the closed cavity. At the same time, the air pressure in the airflow channel increases, and the air in the airflow channel enters the inner cavity of the sealing airbag. The surface of the sealing airbag is pressurized and expands and presses against the cover plate surface, further improving the sealing stability of the fresh air unit.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The cover plate allows for the separation of the filter and the housing, making it easy to replace and clean the filter, thus improving the ease of use for the fresh air unit.

[0029] 2. The setting of the limiting plate and limiting bolts, the limiting plate surface and the bottom wall of the sliding cavity clamp the two sides of the filter screen to form a limit, so that the filter screen is not easy to shift in the sliding cavity, thereby improving the limiting stability of the filter screen in the sliding cavity;

[0030] 3. The closed cavity is designed such that the cover plate is flush with the shell surface and presses against the shell surface to seal the sliding cavity, thereby enabling directional opening and closing of the sliding cavity. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application.

[0032] Figure 2 This is a partial structural diagram of an embodiment of this application, mainly showing the heat exchange core.

[0033] Figure 3 This is a schematic diagram of the overall structure in the embodiments of this application, mainly showing the sliding cavity.

[0034] Figure 4 This is a partial cross-sectional view of an embodiment of this application, mainly showing the fixing component.

[0035] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0036] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Air inlet; 12. Air outlet; 13. Return air outlet; 14. Supply air outlet; 15. Sliding cavity; 16. Limiting cavity; 17. Closing cavity; 18. Fixing cavity; 19. Closing groove; 110. Airflow channel; 2. Cover plate; 21. Fixing groove; 22. Slide rail; 23. Push-pull cavity; 24. Sealing cavity; 25. Push-pull groove; 26. Connecting cavity; 3. Heat exchange core; 4. Exhaust fan; 5. Filter screen; 6. Supply fan; 7. 71. Limiting assembly; 72. Limiting plate; 8. Limiting bolt; 9. Fixing assembly; 10. Fixing post; 11. Guide surface; 12. Fixing plate; 13. Elastic element one; 14. Sealing airbag; 15. Sealing assembly; 16. Elastic element two; 17. Push-pull piston; 18. Elastic plate; 19. Connecting rope; 100. Sealing piston; 101. Buffer surface; 102. Elastic element three; 103. Push-pull plate; 104. Guide surface; 105. Sealing block. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0038] This application discloses a fresh air system. (Refer to...) Figure 1 and Figure 2 The fresh air unit includes a housing 1, a cover plate 2, a heat exchange core 3, an exhaust fan 4, a supply fan 6, and two filters 5. An air inlet 11 and an exhaust outlet 12 are spaced apart on one side of the housing 1 along its length, and the inner cavity of the housing 1 connects the air inlet 11 and the exhaust outlet 12. A return air inlet 13 and a supply air inlet 14 are spaced apart on the other side of the housing 1 along its length, and the inner cavity of the housing 1 connects the return air inlet 13 and the supply air inlet 14. The heat exchange core 3 is installed on the inner wall of the housing 1, and the length of the heat exchange core 3 is parallel to the width of the housing 1. The exhaust fan 4 is bolted to the inner wall of the housing 1 facing the exhaust port 12, and the supply fan 6 is bolted to the inner wall of the housing 1 facing the supply port 14. Two sliding cavities 15 are opened at intervals on the surface of the housing 1 for the sliding of the filter screen 5. The sliding cavity 15 is connected to the inner cavity of the housing 1. The sliding direction of the filter screen 5 is parallel to the height direction of the housing 1. One filter screen 5 is located on the side of the heat exchange core 3 facing the air inlet 11, and the other filter screen 5 is located on the side of the heat exchange core 3 facing the return air inlet 13.

[0039] Reference Figure 1 and Figure 2 When the fresh air unit is in use, the supply fan 6 and the exhaust fan 4 operate. Outdoor air enters the inner cavity of the housing 1 through the air inlet 11 and passes through the filter screen 5 and the heat exchange core 3 in sequence before entering the room through the air outlet 14, thus achieving a directional supply of fresh air to the room. At the same time, outdoor air enters the inner cavity of the housing 1 through the return air outlet 13 and passes through the filter screen 5 and the heat exchange core 3 in sequence before entering the outside through the exhaust outlet 12, thus achieving mutual exchange between fresh air and old air in the room and purifying the indoor air environment.

[0040] Reference Figure 2 and Figure 3 Limiting components 7 are installed on the inner wall of the sliding cavity 15. The limiting components 7 can oriented and limit the filter screen 5 within the sliding cavity 15. The limiting components 7 include a limiting plate 71 and a limiting bolt 72. A limiting cavity 16 is opened in the inner wall of the sliding cavity 15 for the limiting plate 71 to be embedded. The end of the limiting bolt 72 passes through the surface of the limiting plate 71 and is threaded and fixed to the inner wall of the limiting cavity 16. The surface of the limiting plate 71 and the bottom wall of the sliding cavity 15 clamp the two sides of the filter screen 5 to form a limit, so that the filter screen 5 is not easy to shift within the inner wall of the sliding cavity 15, thereby improving the limiting stability of the filter screen 5 within the sliding cavity 15.

[0041] Reference Figure 2 and Figure 3The cover plate 2 is rotatably connected to the surface of the housing 1 via a hinge and covers the sliding cavity 15. The rotation axis of the cover plate 2 is parallel to the length direction of the housing 1. The surface of the housing 1 facing the cover plate 2 has a closed cavity 17 for the end of the cover plate 2 to be inserted. When the cover plate 2 rotates towards the housing 1 and the end of the cover plate 2 is inserted into the closed cavity 17, the surface of the cover plate 2 presses against the surface of the housing 1 and closes the sliding cavity 15. The surface of the cover plate 2 is flush with the surface of the housing 1, thereby achieving directional closure of the sliding cavity 15.

[0042] Reference Figure 1 and Figure 4 The housing 1 is equipped with a fixing assembly 8, which can confine the end of the cover plate 2 within the closed cavity 17. The fixing assembly 8 includes a fixing post 81, a fixing plate 82, and an elastic element 83. The inner wall of the closed cavity 17 facing the end of the cover plate 2 has a fixing cavity 18 for the fixing post 81 to be inserted. The fixing cavity 18 communicates with the inner cavity of the housing 1. One end of the fixing post 81 is fixed to the inner wall of the fixing cavity 18 by bolts, and the other end of the fixing post 81 protrudes from the inner wall of the closed cavity 17. The end of the inner wall of 17 is provided with a guide surface 811, which is in the shape of a circular arc protrusion. The end face of the cover plate 2 is provided with a fixing groove 21 for the end of the fixing post 81 to be inserted. When the end of the cover plate 2 is inserted into the closed cavity 17, the guide surface 811 abuts against the end face of the cover plate 2 and guides the end of the fixing post 81 to be inserted into the fixing groove 21. The outer peripheral surface of the fixing post 81 abuts against the inner wall of the fixing groove 21 to form a limit, so that the end of the cover plate 2 is not easy to detach from the closed cavity 17, thus realizing the initial limit of the cover plate 2 in the closed cavity 17.

[0043] Reference Figure 1 and Figure 4 The cover plate 2 has a slide 22 on the surface facing the closed cavity 17 for the fixed plate 82 to slide. The sliding direction of the cover plate 2 is parallel to the width direction of the housing 1. The inner wall of the closed cavity 17 facing the slide 22 has a closing groove 19 for the end of the cover plate 2 to be embedded. The elastic element 83 can be a compression spring or a tension spring. In this embodiment, the elastic element 83 is a compression spring with a certain deformation capability. One end of the elastic element 83 in the elastic direction is connected to the surface of the fixed plate 82, and the other end of the elastic element 83 in the elastic direction is connected to the inner wall of the slide 22. The elastic element 83 has the elastic force to drive the fixed plate 82 to slide towards the closing groove 19, and the end of the fixed plate 82 tends to be embedded in the closing groove 19.

[0044] Reference Figure 1 and Figure 4When the end of the cover plate 2 is embedded in the closed cavity 17, the slide 22 connects to the closed groove 19, and the bottom wall of the slide 22 is flush with the bottom wall of the closed groove 19. The elastic element 83 drives the cover plate 2 to slide towards the closed groove 19. The end of the cover plate 2 is embedded in the closed groove 19, and the surface of the cover plate 2 abuts against the inner wall of the closed groove 19 to form a limit, making it difficult for the end of the cover plate 2 to detach from the closed cavity 17. This achieves secondary limiting of the cover plate 2 in the closed cavity 17, thereby improving the limiting stability of the cover plate 2 on the housing 1.

[0045] Reference Figure 4 and Figure 5 The inner wall of the closed cavity 17 is connected to a sealing airbag 9. The material of the sealing airbag 9 can be rubber or silicone. In this embodiment, the material of the sealing airbag 9 is rubber, which has a certain deformation capability. When the end of the cover plate 2 is embedded in the closed cavity 17, the surface of the cover plate 2 and the inner wall of the closed cavity 17 abut against both sides of the sealing airbag 9 to form a seal, so that the air in the sliding cavity 15 is not easy to overflow from the abutment of the surface of the cover plate 2 and the inner wall of the closed cavity 17, thereby improving the sealing stability of the fresh air unit.

[0046] Reference Figure 4 and Figure 5 The housing 1 is equipped with a sealing assembly 10, which can apply pressure to the surface of the sealing airbag 9 to further improve the sealing stability of the fresh air unit. The sealing assembly 10 includes an elastic element 101, a push-pull piston 102, an elastic plate 103, a connecting rope 104, a sealing piston 105, an elastic element 106, a push-pull plate 107, and multiple sealing blocks 108. The cover plate 2 has a push-pull cavity 23 for the push-pull plate 107 to slide. The sliding direction of the push-pull plate 107 is parallel to the height direction of the housing 1. The ends of the multiple sealing blocks 108 are connected at intervals to the surface of the push-pull plate 107 facing the sealing airbag 9. The push-pull cavity 23 is provided with multiple sealing cavities 24 at intervals near the inner wall of the sealing airbag 9 for the sealing blocks 108 to slide. The sealing cavities 24 penetrate the surface of the cover plate 2 and face the sealing airbag 9.

[0047] Reference Figure 4 and Figure 5The push-pull piston 102 can be made of rubber or silicone. In this embodiment, the push-pull piston 102 is made of rubber, which has a certain deformation capability. The end face of the cover plate 2 is provided with a push-pull groove 25 for the push-pull piston 102 to slide. The sliding direction of the push-pull piston 102 is parallel to the length direction of the housing 1. The push-pull groove 25 is located on the side of the push-pull plate 107 away from the sealing block 108. The end face of the push-pull plate 107 that abuts against the push-pull piston 102 is provided with a guide surface 1071. The inclination height of the guide surface 1071 increases as the distance to the sealing block 108 decreases. The second elastic element 101 can be a compression spring or a tension spring. In this embodiment, the second elastic element 101 is a compression spring with a certain deformation capability. One end of the second elastic element 101 in the elastic direction is connected to the surface of the push-pull plate 107, and the other end of the second elastic element 101 in the elastic direction is connected to the inner wall of the push-pull cavity 23. The second elastic element 101 has the elastic force to drive the push-pull plate 107 to slide away from the sealing airbag 9. The end face of the sealing block 108 is flush with the surface of the cover plate 2, and the guide surface 1071 abuts against the surface of the push-pull piston 102 and drives the push-pull piston 102 to slide away from the push-pull cavity 23.

[0048] Reference Figure 4 and Figure 5 The elastic plate 103 can be made of rubber or silicone. In this embodiment, the elastic plate 103 is made of rubber and has a certain deformation capability. The inner wall of the fixing groove 21 near the push-pull cavity 23 is provided with a connecting cavity 26 for the elastic plate 103 to slide. The end of the elastic plate 103 protruding from the connecting cavity 26 is connected to the inner wall of the fixing groove 21. The connecting cavity 26 communicates with the push-pull cavity 23. One end of the connecting rope 104 is connected to the surface of the elastic plate 103, and the other end of the connecting rope 104 is connected to the surface of the push-pull piston 102. The connecting rope 104 between the push-pull piston 102 and the elastic plate 103 is in a taut state.

[0049] Reference Figure 4 and Figure 5 The sealing piston 105 can be made of rubber or silicone. In this embodiment, the sealing piston 105 is made of rubber. An inflation channel 110 is provided on the inner wall of the closed cavity 17 for the sealing piston 105 to slide. The sliding direction of the sealing piston 105 is parallel to the sliding direction of the push-pull plate 107. The inflation channel 110 is connected to the inner cavity of the sealing airbag 9. The elastic element 106 can be a compression spring or a tension spring. In this embodiment, the elastic element 106 is a compression spring and has a certain deformation capability. One end of the elastic element 106 in the elastic direction is connected to the inner wall of the inflation channel 110, and the other end of the elastic element 106 in the elastic direction is connected to the surface of the sealing piston 105. The elastic element 106 has the elastic force to drive the sealing piston 105 to slide away from the inflation channel 110, and the end of the sealing piston 105 tends to protrude from the inner wall of the closed cavity 17.

[0050] Reference Figure 4and Figure 5 The end of the sealing piston 105 protruding from the inner wall of the closed cavity 17 is provided with a buffer surface 1051, which is arc-shaped. When the end of the cover plate 2 is embedded in the closed cavity 17, the guide surface 811 abuts against the end face of the cover plate 2 and guides the end of the fixing post 81 to be embedded in the fixing groove 21. The guide surface 811 abuts against the surface of the elastic plate 103, and the surface of the elastic plate 103 is deformed under pressure, causing the end of the elastic plate 103 to slide along the inner wall of the connecting cavity 26 away from the push-pull cavity 23. The connecting rope 104 receives the power of the elastic plate 103 and drives the push-pull piston 102. The guide surface 1071 slides along the inner wall of the push-pull groove 25 toward the push-pull cavity 23, and abuts against the end face of the push-pull piston 102 and guides the push-pull plate 107 to slide along the inner wall of the push-pull cavity 23 toward the sealing airbag 9. This causes the sealing block 108 to slide along the inner wall of the sealing cavity 24 toward the sealing airbag 9. The end of the sealing block 108 protruding from the cover plate 2 presses against the surface of the sealing airbag 9, increasing the pressure points on the sealing airbag 9. The inner wall of the closed cavity 17 and the surface of the cover plate 2 abut against both sides of the sealing airbag 9 to form a seal, further improving the sealing stability of the fresh air unit.

[0051] Reference Figure 4 and Figure 5 Meanwhile, the buffer surface 1051 abuts against the end face of the push-pull piston 102 and guides the sealing piston 105 to slide towards the direction of the airflow channel 110. The end face of the sealing piston 105 is flush with the inner wall of the closed cavity 17. At the same time, the air pressure in the airflow channel 110 increases, and the air in the airflow channel 110 enters the inner cavity of the sealing airbag 9. The surface of the sealing airbag 9 is pressurized and expands and presses against the surface of the cover plate 2, further improving the sealing stability of the fresh air unit.

[0052] The implementation principle of a fresh air system according to an embodiment of this application is as follows: When the fresh air system is in use, the supply fan 6 and the exhaust fan 4 operate. Outdoor air enters the inner cavity of the housing 1 through the air inlet 11 and passes through the filter screen 5 and the heat exchange core 3 in sequence before entering the room through the air outlet 14, thus achieving a directional supply of fresh air to the room. At the same time, indoor air enters the inner cavity of the housing 1 through the return air inlet 13 and passes through the filter screen 5 and the heat exchange core 3 in sequence before entering the outside through the exhaust outlet 12, thus achieving the exchange of fresh air and old air in the room and purifying the indoor air environment. When the operator needs to clean and replace the filter 5, the cover plate 2 is driven to rotate away from the housing 1. The sealing effect of the cover plate 2 on the sliding cavity 15 is lost. The limiting bolt 72 is unscrewed, and the limiting effect of the limiting plate 71 in the limiting cavity 16 is lost. The limiting plate 71 is removed, so that the limiting effect of the filter 5 in the sliding cavity 15 is lost. The filter 5 is driven to slide along the inner wall of the sliding cavity 15 away from the housing 1, realizing the separation of the filter 5 and the housing 1. This makes it convenient to replace and clean the filter 5, thereby improving the ease of use of the fresh air unit for users.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fresh air system, characterized in that: The device includes a housing (1), a cover plate (2), a heat exchange core (3), an exhaust fan (4), a supply fan (6), and at least two filters (5). An air inlet (11) and an air outlet (12) are spaced apart on one side of the housing (1), and the inner cavity of the housing (1) connects the air inlet (11) and the air outlet (12). A return air inlet (13) and a supply air inlet (14) are spaced apart on the other side of the housing (1), and the inner cavity of the housing (1) connects the return air inlet (13) and the supply air inlet (14). The heat exchange core (3) is connected to the inner wall of the housing (1). The exhaust fan (4) is connected to the inner wall of the housing (1) near the exhaust outlet (12). The supply fan (6) is connected to the inner wall of the housing (1) near the supply air outlet. The inner wall of the opening (14) has at least two sliding cavities (15) spaced apart on the surface of the housing (1) for the sliding of the filter screen (5). The sliding cavities (15) are connected to the inner cavity of the housing (1). One of the filter screens (5) is located on the side of the heat exchange core (3) facing the air inlet (11), and the other filter screen (5) is located on the side of the heat exchange core (3) facing the air return outlet (13). The cover plate (2) is rotatably connected to the surface of the housing (1) and covers the sliding cavity (15). The inner wall of each sliding cavity (15) is connected to a limiting component (7). The limiting component (7) includes a limiting plate (71) and a limiting bolt (72). The inner wall of the sliding cavity (15) near the cover plate (2) is provided with a limiting plate for the limiting component. (71) An embedded limiting cavity (16) is formed, the end of the limiting bolt (72) passes through the surface of the limiting plate (71) and is threaded and fixed to the inner wall of the limiting cavity (16), and the surface of the limiting plate (71) and the bottom wall of the sliding cavity (15) clamp the filter screen (5) on both sides to form a limiting; the surface of the housing (1) facing the cover plate (2) is provided with a closed cavity (17) for the end of the cover plate (2) to be embedded, when the cover plate (2) rotates in the direction close to the sliding cavity (15), the end of the cover plate (2) is embedded in the closed cavity (17), the surface of the cover plate (2) is flush with the surface of the housing (1), and the surface of the cover plate (2) abuts against the surface of the housing (1) and closes the sliding cavity (15); the housing (1) is connected to a fixed The fixing component (8) includes a fixing post (81). The inner wall of the closed cavity (17) facing the end of the cover plate (2) is provided with a fixing cavity (18) for the fixing post (81) to be inserted. The fixing cavity (18) is connected to the inner cavity of the shell (1). The end face of the cover plate (2) is provided with a fixing groove (21) for the end of the fixing post (81) to be inserted. The end of the fixing post (81) protruding from the inner wall of the closed cavity (17) is provided with a guide surface (811). The guide surface (811) is arc-shaped and can abut against the end face of the cover plate (2) and guide the end of the fixing post (81) to be inserted into the fixing groove (21). The inner wall of the closed cavity (17) is connected to a sealing airbag (9).The cover plate (2) and the inner wall of the closed cavity (17) clamp the two sides of the sealing airbag (9) to form a seal; the housing (1) is connected to a sealing assembly (10), the sealing assembly (10) includes a push-pull plate (107) and a plurality of sealing blocks (108), the cover plate (2) has a push-pull cavity (23) for the push-pull plate (107) to slide, the push-pull cavity (23) has a plurality of sealing cavities (24) for the sealing blocks (108) to slide at intervals near the inner wall of the sealing airbag (9), the sealing cavity (24) penetrates the cover plate (2) and faces the sealing airbag (9), one end of the sealing block (108) faces the surface of the sealing airbag (9). The other end of the sealing block (108) is connected to the surface of the push-pull plate (107). The sealing assembly (10) also includes an elastic element (101) and a push-pull piston (102). The end face of the cover plate (2) is provided with a push-pull groove (25) for the push-pull piston (102) to slide. The sliding direction of the push-pull piston (102) is perpendicular to the sliding direction of the push-pull plate (107). The push-pull groove (25) is connected to the push-pull cavity (23), and the push-pull groove (25) is located on the side of the push-pull plate (107) away from the sealing block (108). The end face of the push-pull plate (107) that abuts against the push-pull piston (102) is provided with a guide surface (1071). The tilt height of the guide surface (1071) increases as the distance to the sealing block (108) decreases. One end of the elastic element (101) in the elastic direction is connected to the surface of the push-pull plate (107), and the other end of the elastic element (101) in the elastic direction is connected to the inner wall of the push-pull cavity (23). The sealing assembly (10) also includes an elastic plate (103) and a connecting rope (104). The inner wall of the fixing groove (21) is provided with a connecting cavity (26) for the end of the elastic plate (103) to slide. The end of the elastic plate (103) protruding from the connecting cavity (26) is connected to the inner wall of the fixing groove (21). The connecting cavity (26) communicates with the push-pull cavity (108). 23), one end of the connecting rope (104) is connected to the surface of the elastic plate (103), and the other end of the connecting rope (104) is connected to the surface of the push-pull piston (102). The sealing assembly (10) also includes a sealing piston (105) and an elastic element three (106). The inner wall of the closed cavity (17) is provided with an inflation channel (110) for the sealing piston (105) to slide. The inflation channel (110) communicates with the inner cavity of the sealing airbag (9). One end of the elastic element three (106) in the elastic direction is connected to the inner wall of the inflation channel (110), and the other end of the elastic element three (106) in the elastic direction is connected to the end face of the sealing piston (105). The elastic element three (106) has the elastic force to drive the sealing piston (105) to slide away from the airflow channel (110), and the end of the sealing piston (105) tends to protrude from the inner wall of the closed cavity (17). The end of the sealing piston (105) protruding from the inner wall of the closed cavity (17) is provided with a buffer surface (1051), and the buffer surface (1051) is in the shape of a rounded convexity.The guide surface (811) abuts against the end face of the push-pull piston (102) and guides the sealing piston (105) to slide towards the charging passage (110).

2. The fresh air system according to claim 1, characterized in that: The fixing component (8) further includes a fixing plate (82) and an elastic element (83). The cover plate (2) has a slide (22) on its surface facing the closed cavity (17) for the fixing plate (82) to slide. The closed cavity (17) has a closing groove (19) on its inner wall facing the slide (22) for the end of the cover plate (2) to be embedded. One end of the elastic element (83) in the elastic direction is connected to the surface of the fixing plate (82), and the other end of the elastic element (83) in the elastic direction is connected to the inner wall of the slide (22). The elastic element (83) has the elastic force to drive the fixing plate (82) to slide towards the closing groove (19), and the end of the fixing plate (82) tends to be embedded in the closing groove (19).

3. The fresh air system according to claim 1, characterized in that: When the push-pull plate (107) slides along the inner wall of the push-pull cavity (23) toward the direction of the sealing airbag (9), it drives the sealing block (108) to slide along the inner wall of the sealing cavity (24) toward the direction of the sealing airbag (9), and the end face of the sealing block (108) squeezes the surface of the sealing airbag (9) to deform.

4. The fresh air system according to claim 3, characterized in that: The elastic element 2 (101) has an elastic force that drives the push-pull plate (107) to slide away from the sealing airbag (9), the end face of the sealing block (108) is flush with the surface of the cover plate (2), and the guide surface (1071) abuts against the end face of the push-pull piston (102) and guides the push-pull piston (102) to slide away from the cover plate (2).

5. The fresh air system according to claim 4, characterized in that: The connecting rope (104) between the push-pull piston (102) and the elastic plate (103) is in a taut state. When the end of the fixed column (81) is embedded in the fixed groove (21), the guide surface (811) abuts against the surface of the elastic plate (103) and drives the end of the elastic plate (103) to slide away from the push-pull cavity (23). The connecting rope (104) receives the power of the elastic plate (103) and drives the push-pull piston (102) to slide along the inner wall of the push-pull groove (25) towards the push-pull cavity (23).

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