A backflow prevention fresh air inlet filter device

Abstract

This utility model belongs to the field of fresh air technology and discloses an anti-backflow fresh air inlet filter device, including a fixed outer shell. The interior of the fixed outer shell forms a sealed cavity. An air inlet communicating with the outside and an air outlet communicating with an indoor air duct are provided on the side wall of the fixed outer shell. A filter assembly is provided inside the sealed cavity. The filter assembly includes a cylindrical composite filter element connected to the sealed cavity via a rotating shaft. Four planes are equidistantly arranged on the outer circumference of the composite filter element. An air supply channel is provided between two opposing planes, with filter screens at both ends of the air supply channel. The other two planes are sealed end faces. The air inlet and outlet are adapted to the ends of the air supply channel and the sealed end faces. This utility model fundamentally eliminates the problem of air backflow when the unit is shut down, preventing outdoor pollutants from entering the room and the composite filter element, effectively protecting the composite filter element, extending its service life, and ensuring indoor air quality.

Description

Technical Field

[0001] This utility model relates to the field of fresh air technology, and in particular to a backflow prevention fresh air inlet filter device. Background Technology

[0002] Fresh air systems are widely used in modern buildings to introduce filtered outdoor air into the room while expelling stale indoor air to maintain indoor air quality. The inlet of a fresh air system is typically equipped with a filter to remove pollutants such as dust and pollen from the outdoor air.

[0003] Most existing fresh air inlet filtration devices use a fixed filter structure. When the system fan stops running, due to the pressure difference or wind force between indoors and outdoors, unfiltered outdoor air may seep back into the room through the filter, causing indoor air pollution. At the same time, humid air containing pollutants remains in the filter element, which is prone to bacterial growth and mold, not only shortening the filter element's lifespan, but also potentially blowing the accumulated pollutants into the room when restarted. Summary of the Invention

[0004] To overcome the technical defects of the existing technology, this utility model provides an anti-backflow fresh air inlet filter device.

[0005] The technical solution adopted by this utility model is: a backflow-proof fresh air inlet filter device, including a fixed shell, the interior of which forms a sealed cavity. An air inlet communicating with the outside and an air outlet communicating with an indoor air duct are provided on the side wall of the fixed shell. A filter assembly is provided inside the sealed cavity. The filter assembly includes a cylindrical composite filter element connected to the sealed cavity via a rotating shaft. Four planes are equidistantly arranged on the outer circumference of the composite filter element, with an air supply channel between two opposing planes. Both ends of the air supply channel are provided with filter screens, and the other two planes are sealed end faces. The air inlet and air outlet are adapted to the ends of the air supply channel and the sealed end faces. A drive assembly for driving the composite filter element to rotate is provided on the fixed shell, and a PLC controller is installed on the outer wall of the fixed shell. The PLC controller is electrically connected to the drive assembly.

[0006] Preferably, the driving component is a servo motor.

[0007] Preferably, the outer peripheral walls of all four planes of the composite filter element are provided with elastic sealing gaskets.

[0008] Preferably, the fixed outer casing is provided with an indoor air duct that communicates with the air outlet, and a main fan is installed inside the indoor air duct.

[0009] Preferably, the PLC controller is electrically connected to the main fan. When the PLC controller receives the start signal of the main fan, it controls the drive component to work, causing the composite filter element to rotate to the air inlet. When the PLC controller receives the stop signal of the main fan, it controls the drive component to work, causing the sealing end face to rotate to the air inlet.

[0010] Preferably, both ends of the composite filter element are provided with 90-degree guide grooves, and the inner wall of the sealed cavity is provided with guide sliders that match the guide grooves.

[0011] The beneficial effects of this utility model are:

[0012] 1. A rotatable composite filter element is installed in the sealed cavity of the fixed outer shell. The composite filter element has an air supply channel and a sealing end face. When air supply is required, the PLC controller controls the drive component to drive the composite filter element to rotate, so that the air supply channel is aligned with the air inlet and air outlet. The filter screen can supply air for filtration, forming a ventilation filtration path. When the machine is stopped and air supply is not required, the PLC controller controls the drive component to drive the composite filter element to rotate, so that the sealing end face is aligned with the air inlet and air outlet, blocking the air inlet. This fundamentally eliminates the problem of air backflow when the machine is stopped, prevents outdoor pollutants from entering the room and the composite filter element, effectively protects the composite filter element, extends the service life of the composite filter element, and ensures the quality of indoor air.

[0013] 2. The elastic sealing gasket enhances the sealing between the composite filter element and the inner wall of the fixed housing. When the sealing end face is rotated to the air inlet position, the elastic sealing gasket can fit tightly to form an airtight seal, completely preventing backflow. When the air supply channel is working, the elastic sealing gasket can also reduce air leakage from non-working areas and improve air supply efficiency. Attached Figure Description

[0014] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the composite filter element structure during the startup of the main fan of this utility model;

[0017] Figure 3 This is a cross-sectional view of the composite filter element structure when the main fan of this utility model stops;

[0018] Figure 4This is a schematic diagram of the composite filter element structure of this utility model.

[0019] Explanation of reference numerals in the attached drawings: 1. Fixed outer casing; 2. Sealed cavity; 3. Air inlet; 4. Air outlet; 5. Composite filter element; 6. Air supply channel; 7. Filter screen; 8. Sealing end face; 9. Drive assembly; 10. PLC controller; 11. Elastic sealing gasket; 12. Indoor air duct; 13. Main fan; 14. Guide groove; 15. Guide slider. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0021] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, this embodiment provides an anti-backflow fresh air inlet filter device, including a fixed housing 1. The interior of the fixed housing 1 forms a sealed cavity 2. The side wall of the fixed housing 1 has an air inlet 3 communicating with the outside and an air outlet 4 communicating with the indoor air duct. The sealed cavity 2 is equipped with a filter assembly. The filter assembly includes a cylindrical composite filter element 5 connected to the sealed cavity 2 via a rotating shaft. The outer circumference of the composite filter element 5 has four planes equidistantly arranged, with an air supply channel 6 between two opposite planes. Both ends of the air supply channel 6 are provided with filter screens 7, and the other two planes are sealed end faces 8. The air inlet 3 and the air outlet 4 are adapted to the ends of the air supply channel 6 and the sealed end faces 8. The fixed housing 1 is provided with a drive assembly 9 for driving the composite filter element 5 to rotate, and a PLC controller 1 is installed on the outer wall of the fixed housing 1. The PLC controller 10 is electrically connected to the drive assembly 9. A rotatable composite filter element 5 is installed within the sealed cavity 2 of the fixed housing 1. The composite filter element 5 has an air supply channel 6 and a sealing end face 8. When air supply is needed, the PLC controller 10 controls the drive assembly 9 to rotate the composite filter element 5, aligning the air supply channel 6 with the air inlet 3 and the air outlet 4. The filter screen 7 can then supply air for filtration, forming a ventilation and filtration path. When the machine is stopped and air supply is not needed, the PLC controller 10 controls the drive assembly 9 to rotate the composite filter element 5, aligning the sealing end face 8 with the air inlet 3 and the air outlet 4, blocking the air inlet 3. This fundamentally eliminates the problem of backflow of air when the machine is stopped, preventing outdoor pollutants from entering the room and the composite filter element 5, effectively protecting the composite filter element 5, extending its service life, and ensuring indoor air quality.

[0022] The drive component 9 is a servo motor. The servo motor has high control precision and fast response speed, and can accurately rotate the composite filter element 5 to a preset angle, namely 90 degrees, to ensure that the air supply channel 6 or the sealing end face 8 is accurately aligned with the air inlet 3, thus ensuring the sealing and reliability of the device.

[0023] The outer peripheral walls of the four planes of the composite filter element 5 are provided with elastic sealing gaskets 11. The setting of the elastic sealing gaskets 11 enhances the sealing between the composite filter element 5 and the inner wall of the fixed housing 1. When the sealing end face 8 is rotated to the air inlet 3 position, the elastic sealing gaskets 11 can fit tightly to form an airtight seal and completely prevent backflow. When the air supply channel 6 is working, the elastic sealing gaskets 11 can also reduce air leakage from non-working areas and improve air supply efficiency.

[0024] The fixed outer casing 1 is provided with an indoor air duct 12 that communicates with the air outlet 4. The main fan 13 is installed inside the indoor air duct 12. The PLC controller 10 is electrically connected to the main fan 13. When the PLC controller 10 receives the start signal of the main fan 13, the PLC controller 10 controls the drive component 9 to work, so that the composite filter element 5 rotates to the air inlet 3. When the PLC controller 10 receives the stop signal of the main fan 13, the PLC controller 10 controls the drive component 9 to work, so that the sealing end face 8 rotates to the air inlet 3. The rotation of the composite filter element 5 is linked to the start and stop of the main fan 13. No manual intervention is required, which is convenient to use. When the main fan 13 starts, the air supply channel 6 is opened. When the main fan 13 is turned off, the sealing end face 8 of the composite filter element 5 rotates to the air inlet 3 to block the air inlet 3, which can prevent backflow.

[0025] Both ends of the composite filter element 5 are provided with 90-degree guide grooves 14, and the inner wall of the sealed cavity 2 is provided with guide sliders 15 that match the guide grooves 14. The matching arrangement of the guide grooves 14 and the guide sliders 15 limits the composite filter element 5 to rotate only within 90 degrees, preventing the composite filter element 5 from over-rotating or misaligning, ensuring the accuracy of the rotation of the composite filter element 5, and also improving the stability of the rotation of the composite filter element 5.

[0026] During operation, after the main fan 13 is turned on, it simultaneously sends a start signal to the PLC controller 10. Upon receiving the signal, the PLC controller 10 immediately controls the servo motor to operate, driving the composite filter element 5 to rotate 90 degrees. This aligns the air supply channel 6, which has a filter screen 7 inside, with the air inlet 3 and the air outlet 4. At this time, outdoor air enters from the air inlet 3 under the suction of the main fan 13, passes through the filter screen 7 at one end of the air supply channel 6, and is filtered. The clean air then passes through the air supply channel 6 and then through the filter screen 7 at the other end and the air outlet 4. When the main fan 13 stops running, it sends a stop signal to the PLC controller 10. The PLC controller 10 then controls the servo motor to operate again, driving the composite filter element 5 to rotate 90 degrees in the opposite direction. This rotates the sealing end face 8 to the air inlet 3. With the assistance of the elastic sealing gasket 11, the air inlet 3 is tightly sealed, cutting off the air passage between indoors and outdoors and achieving the backflow prevention function.

[0027] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0028] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A backdraft-preventing fresh air inlet filter device, characterized by: Includes a fixed outer shell (1), the interior of which forms a sealed cavity (2), and the side wall of the fixed outer shell (1) is provided with an air inlet (3) communicating with the outside and an air outlet (4) communicating with the indoor air duct, and the interior of the sealed cavity (2) is provided with a filter assembly; The filter assembly includes a cylindrical composite filter element (5) connected to the sealed cavity (2) via a rotating shaft. Four planes are equidistantly arranged on the outer circumference of the composite filter element (5). An air supply channel (6) is provided between two opposite planes. Both ends of the air supply channel (6) are provided with filter screens (7). The other two planes are provided as sealing end faces (8). The air inlet (3) and the air outlet (4) are adapted to the end of the air supply channel (6) and the sealing end face (8). The fixed housing (1) is provided with a drive assembly (9) for driving the composite filter element (5) to rotate. A PLC controller (10) is installed on the outer wall of the fixed housing (1). The PLC controller (10) is electrically connected to the drive assembly (9).

2. The backflow-preventing fresh air inlet filter device according to claim 1, characterized in that: The drive component (9) is configured as a servo motor.

3. The backflow-preventing fresh air inlet filter device according to claim 1, characterized in that: The outer peripheral walls of the four planes of the composite filter element (5) are provided with elastic sealing gaskets (11).

4. The backflow prevention fresh air inlet filter device according to claim 1, characterized in that: The fixed outer shell (1) is provided with an indoor air duct (12) connected to the air outlet (4), and the main fan (13) is installed inside the indoor air duct (12).

5. The backdraft-preventing fresh air inlet filter device according to claim 4, characterized in that: The PLC controller (10) is electrically connected to the main fan (13). When the PLC controller (10) receives the start signal of the main fan (13), the PLC controller (10) controls the drive component (9) to work, so that the composite filter element (5) rotates to the air inlet (3). When the PLC controller (10) receives the stop signal from the main fan (13), the PLC controller (10) controls the drive assembly (9) to work, so that the sealing end face (8) rotates to the air inlet (3).

6. The backdraft-preventing fresh air inlet filter device according to claim 1, characterized in that: The composite filter element (5) has 90-degree guide grooves (14) at both ends, and the inner wall of the sealed cavity (2) is provided with guide sliders (15) that match the guide grooves (14).

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