Multi-layer composite filtering type air purifier

Abstract

The invention relates to the technical field of air purification, and discloses a multi-layer composite filtering type air purifier which comprises a shell, a filtering assembly for efficiently filtering air is arranged in the shell, the left side of the shell is fixedly connected with an air outlet plate, and the right side of the shell is fixedly connected with a dust filtering plate. The device comprises a shell, a supporting plate is fixedly connected to the interior of the shell, a double-end motor is fixedly connected to the top of the supporting plate, output shafts are fixedly connected to the two output ends of the double-end motor, and a containing shell is fixedly connected to the outer portions of the output shafts. According to the device, the output shaft is driven to rotate through the double-end motor, the containing shell is driven to synchronously run, and the sliding plate and the connecting plate are pushed to extend outwards by means of the elastic thrust and damping action of the first spring and the first damper in the containing shell, so that the scraping plate is tightly attached to the surfaces of the dust filtering plate and the air outlet plate to do circular motion, and dust on the surface of the plate body is continuously scraped; and air inlet and outlet channels are prevented from being blocked.

Description

Technical Field

[0001] The present invention relates to the technical field of air purification, in particular to a multi-layer composite filter type air purifier. Background Art

[0002] In modern society, the quality of indoor environments, including residential, office, and medical facilities, is closely linked to public health. In homes, harmful gases like formaldehyde and benzene released from decoration materials, particulate matter from kitchen fumes, and allergens like pet hair and dander pose a constant threat to respiratory health. In offices, the intensive human activity, dust accumulation from central air conditioning systems, and volatile organic compounds (VOCs) released by printers and copiers can easily trigger dizziness, allergies, and other issues. Medical facilities, on the other hand, place even higher demands on air quality. The airborne transmission risks of bacteria and viruses in hospital wards, as well as the stringent sterile environment standards of operating rooms, all rely on high-efficiency air purification equipment.

[0003] However, existing multi-layer composite filter air purifiers have significant practical drawbacks: over time, the dust filter and air outlet plates are exposed to the air flow for a long time, and their surfaces and pores are easily clogged by pollutants such as indoor dust, soot particles, and pet hair. For example, in the home, oily dust from cooking in the kitchen, dander fibers accumulated in the bedroom, and toner particles released by printers in the office environment all adhere to the plate surface under the impact of airflow, forming a dense dust layer.

[0004] Therefore, a multi-layer composite filter type air purifier is proposed in response to the above problems. Summary of the Invention

[0005] In order to make up for the above deficiencies, the present invention provides a multi-layer composite filter-type air purifier, which aims to improve the problem in the prior art that the dust filter plate cannot be cleaned.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A multi-layer composite filter type air purifier comprises a shell, the interior of the shell is provided with a filter assembly for efficiently filtering air, the left side of the shell is fixedly connected to an air outlet plate, the right side of the shell is fixedly connected to a dust filter plate, the interior of the shell is fixedly connected to a support plate, the top of the support plate is fixedly connected to a double-headed motor, two output ends of the double-headed motor are fixedly connected to an output shaft, the outside of the output shaft is fixedly connected to a accommodating shell, the interior of the accommodating shell is provided with a cavity one, the inner wall of the cavity one is fixedly connected to a plurality of dampers one, the outside of the damper one is sleeved with a spring one, the interior of the cavity one is slidably connected to a sliding plate, the outside of the sliding plate is fixedly connected to a connecting plate, the outside of the connecting plate is fixedly connected to a scraper, and the left and right sides of the shell are fixedly connected to limiting rings; As a further description of the above technical solution: The filter assembly includes a filter layer 1, a filter layer 2, a filter layer 3, and a filter layer 4. The exteriors of the filter layer 1, the filter layer 2, the filter layer 3, and the filter layer 4 are all fixedly connected to the interior of the housing. The exterior of one of the output shafts is rotatably connected to the middle of the filter layer 1 and the filter layer 2, and the exterior of the other output shaft is rotatably connected to the middle of the filter layer 3 and the filter layer 4. As a further description of the above technical solution: The four corners of the bottom of the shell are fixedly connected to support legs, the bottoms of the support legs are fixedly connected to limit plates, the outsides of the support legs are slidably connected to the bottom shell, the inside of the bottom shell is provided with a second cavity, the bottom inner wall of the second cavity is fixedly connected to a second damper, and the outside of the second damper is provided with a second spring; As a further description of the above technical solution: The outer portion of one of the output shafts is rotatably connected to the middle portion of the air outlet plate, and the outer portion of the other output shaft is rotatably connected to the middle portion of the dust filter plate; As a further description of the above technical solution: The outer portion of one of the scrapers contacts the outer portion of the dust filter plate, the outer portion of the other scraper contacts the outer portion of the air outlet plate, and the sliding plate, the connecting plate, and the middle portion of the scraper are all slidably connected to the outer portion of the output shaft; As a further description of the above technical solution: The other end of the damper 1 is fixedly connected to the outside of the sliding plate, one end of the spring 1 is fixedly connected to the inner wall of the cavity 1, and the other end of the spring 1 is fixedly connected to the outside of the sliding plate; As a further description of the above technical solution: The outer portion of the limit plate is slidably connected to the interior of the second cavity, the top of the second damper is fixedly connected to the bottom of the limit plate, one end of the second spring is fixedly connected to the bottom of the limit plate, and the other end of the second spring is fixedly connected to the bottom inner wall of the second cavity; As a further description of the above technical solution: The first filter layer and the third filter layer are both composed of polypropylene fibers, and an activated carbon filter layer is provided inside the second filter layer and the fourth filter layer.

[0007] The present invention has the following beneficial effects: 1. In the present invention, the output shaft is driven to rotate by a double-headed motor, which drives the accommodating shell to operate synchronously. With the help of the elastic thrust and damping effect of the spring 1 and the damper 1 in the accommodating shell, the sliding plate and the connecting plate are pushed to extend outward, so that the scraper is closely attached to the surface of the dust filter plate and the air outlet plate to make a circular motion, continuously scraping off the dust on the surface of the plate to avoid blockage of the air inlet and outlet channels; at the same time, the external air is guided to flow through the composite filter assembly consisting of the polypropylene fiber filter layer 1, the filter layer 3 and the activated carbon filter layer 2, the filter layer 4 in sequence. The four-stage filtration division of labor cooperates to gradually intercept dust and absorb odor, thereby achieving the beneficial effects of efficient air purification and self-cleaning of the equipment, ensuring long-term smooth airflow, and improving purification efficiency and filter element life.

[0008] 2. In the present invention, the periodic vibration generated by the operation of the double-headed motor is transmitted to the shell through the support plate, and then transmitted to the bottom support leg. Relying on the upper and lower sliding guide of the limit plate inside the support leg along the bottom shell cavity 2, the coaxially arranged spring 2 elastically deforms to store and release vibration energy, and the damper 2 converts mechanical energy into heat energy through medium friction and dissipates it. The three work together to construct a "buffer-energy consumption-limiting" shock absorption mechanism, which greatly reduces the vibration amplitude of the shell and effectively reduces the noise generated by the structural vibration of the equipment, achieving the beneficial effects of quiet operation and improved stability of the equipment, creating a quiet use environment, and ensuring long-term and reliable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a three-dimensional schematic diagram of a multi-layer composite filter air purifier proposed by the present invention; Figure 2 This is a schematic structural diagram of a filter layer 1 of a multi-layer composite filter-type air purifier proposed by the present invention; Figure 3 This is a schematic structural diagram of a rotating plate of a multi-layer composite filter-type air purifier proposed by the present invention; Figure 4 This is a schematic structural diagram of a dust filter plate of a multi-layer composite filter-type air purifier proposed by the present invention; Figure 5 This is a schematic structural diagram of a housing for a multi-layer composite filter-type air purifier proposed by the present invention; Figure 6 for Figure 5 A magnified view of point A; Figure 7 This is a schematic structural diagram of the support legs of a multi-layer composite filter-type air purifier proposed by the present invention; Figure 8 for Figure 7 Enlarged view of point B.

[0010] Legend: 1. Shell; 2. Filter layer 1; 3. Filter layer 2; 4. Filter layer 3; 5. Filter layer 4; 6. Air outlet plate; 7. Dust filter plate; 8. Support plate; 9. Double-head motor; 10. Output shaft; 11. Rotating plate; 12. Containing shell; 13. Cavity 1; 14. Damper 1; 15. Spring 1; 16. Sliding plate; 17. Connecting plate; 18. Scraper; 19. Limiting ring; 20. Support leg; 21. Limiting plate; 22. Bottom shell; 23. Cavity 2; 24. Spring 2; 25. Damper 2. DETAILED DESCRIPTION

[0011] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0012] Reference Figures 1 to 6 , an embodiment provided by the present invention: a multi-layer composite filter air purifier, comprising a shell 1, the shell 1 serves as the basic bearing structure of the air purifier, provides installation space and protection for all internal components (filter components, motors, support structures, etc.), ensures that the relative positions of the components remain stable during operation, and isolates the internal structure from the external environment to prevent external foreign matter from interfering with the purification process. A filter component for efficiently filtering useful air is provided inside the shell 1, and an air outlet plate 6 is fixedly connected to the left side of the shell 1. The air outlet plate 6 is fixed to the left side of the shell 1 and serves as an exhaust channel for the purified air. The air outlet holes evenly distributed on its surface can disperse the airflow, avoid local excessive wind speed and noise, and at the same time prevent external large particles of foreign matter from flowing back into the shell 1. A dust filter plate 7 is fixedly connected to the right side of the shell 1. The dust filter plate 7 is fixed to the right side of the shell 1 and serves as an inlet channel for external air. Its mesh structure can initially intercept large-volume debris such as hair and paper scraps to prevent them from directly entering the filter component and causing blockage, thereby reducing the frequency of subsequent maintenance.

[0013] The inside of the shell 1 is fixedly connected to a support plate 8, which is fixed to the inside of the shell 1 to provide an installation basis for the double-headed motor 9. The weight of the motor is evenly distributed to the shell 1 through a rigid structure to avoid additional vibration caused by unstable installation when the motor is running. The top of the support plate 8 is fixedly connected to the double-headed motor 9. The double-headed motor 9 serves as the power source of the device. It synchronously outputs rotational power through dual output ends to provide dual driving force for air circulation (driving the rotating plate 11) and self-cleaning (driving the scraper 18), realizing the integrated operation of the "purification + cleaning" function. The two output ends of the double-headed motor 9 are fixedly connected to the output shaft 10. The output shaft 10 connects the output end of the double-headed motor 9 with the external components (the containing shell 12, the rotating plate 11), and transmits the rotational power of the motor to each actuator to ensure the synchronization of the rotation of the rotating plate 11 to form airflow and the rotation of the containing shell 12 to drive the scraper 18 to clean.

[0014] The external rotation of one of the output shafts 10 is connected to the middle of the air outlet plate 6, and the external rotation of the other output shaft 10 is connected to the middle of the dust filter plate 7. The filter assembly includes filter layer 1 2, filter layer 2 3, filter layer 3 4 and filter layer 4 5. Filter layer 1 2 is located in the innermost layer of the filter assembly, and intercepts fine particles in the air (pollen, dust mite corpse fragments, etc.) through fine fiber pores to improve the fineness of air purification. Filter layer 2 3 is arranged adjacent to filter layer 1 2. The porous structure of the activated carbon inside it can adsorb gaseous pollutants remaining after the previous stage of filtration (such as formaldehyde, benzene series, kitchen fume odor, etc.), realizing the coordinated purification of "particle filtration + odor adsorption". Filter layer 3 4 is located in the middle of the filter assembly, and intercepts larger particles in the air (such as hair, cotton wool, dust balls, etc.) through a coarser fiber mesh, reducing the load of subsequent filter layers and extending the overall service life of the filter element.

[0015] Filter layer four 5 is the outermost layer of the filter component. Its activated carbon layer preferentially absorbs large molecular odor substances in the air (such as the odor of pet excrement, cigarette smoke, etc.), and preliminarily purifies the air while protecting the inner fiber filter layer from clogging by oily pollutants. Filter layer one 2 and filter layer three 4 are both composed of polypropylene fibers. Activated carbon filter layers are provided inside filter layer two 3 and filter layer four 5. The outsides of filter layer one 2, filter layer two 3, filter layer three 4 and filter layer four 5 are all fixedly connected to the inside of the shell 1. The outside of one output shaft 10 is rotatably connected to the middle of filter layer one 2 and filter layer two 3, and the outside of the other output shaft 10 is rotatably connected to the middle of filter layer three 4 and filter layer four 5. The outside of the output shaft 10 is fixedly connected to a containing shell 12, which is fixed to the outside of the output shaft 10. The cavity one 13 inside it provides installation space for damper one 14, spring one 15 and sliding plate 16.

[0016] And through the structural design that rotates with the output shaft 10, the rotational motion is converted into the circumferential cleaning action of the scraper 18. A cavity 13 is provided inside the accommodating shell 12. The cavity 13 is provided inside the accommodating shell 12 to limit the sliding direction and stroke of the sliding plate 16, ensuring that the deformation of the spring 15 and the damper 14 is within a controllable range, thereby preventing the sliding plate 16 from being separated from the cleaning surface due to excessive displacement. The inner wall of the cavity 13 is fixedly connected with a plurality of dampers 14. The damper 14 is fixed between the inner wall of the cavity 13 and the sliding plate 16, providing a damping force during the sliding process of the sliding plate 16, slowing down the elastic release speed of the spring 15, and preventing the scraper 18 from having a hard collision with the dust filter plate 7 or the air outlet plate 6 due to excessive elastic force. In order to extend the service life of the scraper 18 and the plate surface, the outer sleeve of the damper 14 is provided with a spring 15, and the spring 15 is sleeved on the outside of the damper 14. The thrust is generated by elastic deformation to push the sliding plate 16 to move toward the outside of the cavity 13, ensuring that the connecting plate 17 and the scraper 18 are always tightly fitted to the surface of the dust filter plate 7 and the air outlet plate 6 to ensure the effectiveness of the cleaning action. The interior of the cavity 13 is slidably connected with the sliding plate 16, and the sliding plate 16 is slidably connected to the inside of the cavity 13. As an intermediate carrier for force transmission, the elastic thrust of the spring 15 and the damping force of the damper 14 are transmitted to the connecting plate 17. At the same time, the radial position of the scraper 18 is adjusted by sliding in the cavity 13 to adapt to dust filter plates 7 or air outlet plates 6 of different thicknesses.

[0017] The other end of the damper 14 is fixedly connected to the outside of the sliding plate 16, one end of the spring 15 is fixedly connected to the inner wall of the cavity 13, and the other end of the spring 15 is fixedly connected to the outside of the sliding plate 16. The outside of the sliding plate 16 is fixedly connected with a connecting plate 17, which is fixed to the outside of the sliding plate 16, connecting the sliding plate 16 and the scraper 18, and converting the linear sliding of the sliding plate 16 into a radial extension movement of the scraper 18, ensuring that the clean surface of the scraper 18 remains in contact with the surface of the dust filter plate 7 or the air outlet plate 6. The outside of the connecting plate 17 is fixedly connected with a scraper 18, which is fixed to the outside of the connecting plate 17. When the scraper 18 rotates in a circular motion with the output shaft 10, its edge rubs against the surface of the dust filter plate 7 and the air outlet plate 6 to scrape off accumulated dust, particles and other pollutants, avoid blockage of the air inlet or outlet channels, and ensure long-term smooth airflow.

[0018] The outer portion of one of the scrapers 18 is in contact with the outer portion of the dust filter plate 7, and the outer portion of the other scraper 18 is in contact with the outer portion of the air outlet plate 6. The sliding plate 16, the connecting plate 17, and the middle portion of the scraper 18 are all slidably connected to the outer portion of the output shaft 10. The left and right sides of the housing 1 are fixedly connected to limit rings 19, which are fixed to the left and right sides of the housing 1 to limit the axial sliding range of the sliding plate 16, the connecting plate 17, and the scraper 18, thereby preventing them from being disengaged from the output shaft 10 due to excessive displacement due to the centrifugal force of rotation, thereby ensuring the stability of the cleaning component operation; Reference Figure 1 、 Figure 7 and Figure 8 The four corners of the bottom of the shell 1 are fixedly connected with support legs 20, and the support legs 20 are fixed to the four corners of the bottom of the shell 1, raising the shell 1 as a whole to avoid direct contact between the bottom and the ground to generate resonance noise. At the same time, the sliding connection structure with the bottom shell 22 provides an installation basis for the shock-absorbing component. The bottom of the support leg 20 is fixedly connected to the limit plate 21, which is fixed to the bottom of the support leg 20 and slidably connected to the cavity 23 of the bottom shell 22, limiting the vertical sliding range of the support leg 20 to prevent the bottom shell 22 from separating from the shell 1 due to excessive displacement of vibration, thereby ensuring the effectiveness of the shock-absorbing structure. The outside of the support leg 20 is slidably connected to the bottom shell 22, which is slidably connected to the outside of the support leg 20 and fixed to the placement surface (such as the ground or desktop). The cavity 23 inside it provides installation space for the limit plate 21, the spring 24 and the damper 25, and at the same time disperses the vibration energy to the placement surface through the rigid structure to reduce the vibration amplitude of the shell 1.

[0019] A cavity 23 is provided inside the bottom shell 22. The cavity 23 is provided inside the bottom shell 22 to limit the sliding trajectory of the limit plate 21, ensuring that the deformation direction of the spring 24 and the damper 25 is consistent with the vibration direction, thereby improving the shock absorption efficiency. The bottom inner wall of the cavity 23 is fixedly connected with the damper 25. The damper 25 is fixed between the bottom of the cavity 23 and the limit plate 21. Through the friction of the internal damping medium, the vibration mechanical energy stored in the spring 24 is converted into heat energy for dissipation, thereby avoiding energy rebound and aggravating the vibration, and further reducing the vibration amplitude of the shell 1. The outer sleeve of the damper 25 is provided with a spring 24, and the spring 24 is sleeved on the outside of the damper 25. Through the elastic deformation of compression and extension, it stores and releases the vibration energy generated by the operation of the double-headed motor 9, buffers the up and down displacement of the support leg 20, and reduces the transmission of vibration to the shell 1. The outer side of the limit plate 21 is slidably connected to the inside of the cavity 23, and the top of the damper 25 is fixedly connected to the bottom of the limit plate 21. One end of the spring 24 is fixedly connected to the bottom of the limit plate 21, and the other end of the spring 24 is fixedly connected to the bottom inner wall of the cavity 23.

[0020] Working principle: First, when the device needs to be used, start the double-headed motor 9, so that the output shafts 10 at the two output ends of the double-headed motor 9 rotate synchronously, driving the external fixed containing shell 12 and the rotating plate 11 to rotate with the output shaft 10. When the rotating plate 11 rotates, the airflow will enter from the dust filter plate 7 and be discharged from the air outlet plate 6. In the cavity 13 inside the containing shell 12, the sliding plate 16 pushes the connecting plate 17 to extend outward under the damping action of the damper 14 and the elastic thrust of the spring 15, so that the scraper 18 fits tightly against the surface of the dust filter plate 7 and the air outlet plate 6. As the output shaft 10 continues to rotate, the scraper 18 performs a circular motion with the output shaft 10 as the center, continuously scraping off the dust accumulated on the outer surface of the dust filter plate 7 and the outer surface of the air outlet plate 6, preventing dust from blocking the air inlet or outlet channels, and ensuring smooth airflow. At the same time, outside air enters the device through the dust filter plate 7 on the right side of the housing 1. It first flows through filter layer 4 5, where the activated carbon filter layer absorbs odor molecules in the air. The air then passes through filter layer 3 4, where the polypropylene fibers in filter layer 3 4 intercept larger dust particles. The initially purified air continues to flow leftward, passing through filter layer 2 3 and filter layer 1 2 in sequence. The activated carbon in filter layer 2 3 further absorbs residual odors, while the polypropylene fibers in filter layer 1 2 filter fine particles. Finally, the purified air is discharged through the air outlet plate 6 on the left side of the housing 1.

[0021] When the double-headed motor 9 is powered on and running, the rotation of its output shaft 10 generates periodic vibrations, which are transmitted to the housing 1 through the support plate 8 and then to the support legs 20 at the four corners of the bottom. At this time, the limit plate 21 at the bottom of the support leg 20 slides back and forth along the cavity 23 inside the bottom shell 22 as the support leg 20 vibrates: when the limit plate 21 slides downward, it compresses the spring 24 at the bottom of the cavity 23, which stores vibration energy through elastic deformation; when the limit plate 21 slides upward, the spring 24 extends due to elastic recovery, releasing the stored energy. At the same time, the damper 25, which is arranged coaxially with the spring 24, converts the mechanical energy of the vibration into heat energy through the friction of the internal damping medium, and simultaneously provides a reverse damping force for the sliding of the limit plate 21. The sliding of the limit plate 21 provides guidance for the deformation of the spring 24 and the damper 25. The three effectively absorb vibration energy through the collaborative mechanism of "elastic buffer spring 24 + damping energy dissipation damper 25 and sliding limit plate 21 and cavity 23", greatly reducing the vibration amplitude of the shell 1, and ultimately effectively reducing the structural noise generated by the vibration of the equipment, ensuring the silent effect during the operation of the air purifier.

[0022] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-layer composite filter air purifier, comprising a housing (1), characterized in that: The shell (1) is provided with a filter assembly for efficient air filtration, the left side of the shell (1) is fixedly connected to an air outlet plate (6), the right side of the shell (1) is fixedly connected to a dust filter plate (7), the inside of the shell (1) is fixedly connected to a support plate (8), the top of the support plate (8) is fixedly connected to a double-headed motor (9), both output ends of the double-headed motor (9) are fixedly connected to an output shaft (10), the outside of the output shaft (10) is fixedly connected to a housing shell (12), and the A cavity (13) is provided inside the accommodating shell (12), a plurality of dampers (14) are fixedly connected to the inner wall of the cavity (13), a spring (15) is sleeved on the outside of the damper (14), a sliding plate (16) is slidably connected to the inside of the cavity (13), a connecting plate (17) is fixedly connected to the outside of the sliding plate (16), a scraper (18) is fixedly connected to the outside of the connecting plate (17), and a limiting ring (19) is fixedly connected to the left and right sides of the shell (1).

2. The multi-layer composite filter air purifier according to claim 1, characterized in that: The filter assembly comprises a filter layer 1 (2), a filter layer 2 (3), a filter layer 3 (4) and a filter layer 4 (5), wherein the exteriors of the filter layer 1 (2), the filter layer 2 (3), the filter layer 3 (4) and the filter layer 4 (5) are all fixedly connected to the interior of the shell (1), wherein the exterior of one of the output shafts (10) is rotationally connected to the middle of the filter layer 1 (2) and the filter layer 2 (3), and the exterior of the other output shaft (10) is rotationally connected to the middle of the filter layer 3 (4) and the filter layer 4 (5).

3. The multi-layer composite filter air purifier according to claim 1, characterized in that: The four corners of the bottom of the shell (1) are fixedly connected to support legs (20), the bottom of the support legs (20) is fixedly connected to a limit plate (21), the outside of the support legs (20) is slidably connected to a bottom shell (22), the inside of the bottom shell (22) is provided with a second cavity (23), the bottom inner wall of the second cavity (23) is fixedly connected to a second damper (25), and the outside of the second damper (25) is provided with a second spring (24).

4. The multi-layer composite filter air purifier according to claim 1, characterized in that: The outer portion of one of the output shafts (10) is rotatably connected to the middle portion of the air outlet plate (6), and the outer portion of the other output shaft (10) is rotatably connected to the middle portion of the dust filter plate (7).

5. The multi-layer composite filter air purifier according to claim 1, characterized in that: The outside of one of the scrapers (18) contacts the outside of the dust filter plate (7), and the outside of the other scraper (18) contacts the outside of the air outlet plate (6). The sliding plate (16), the connecting plate (17), and the middle of the scraper (18) are all slidably connected to the outside of the output shaft (10).

6. The multi-layer composite filter air purifier according to claim 1, characterized in that: The other end of the damper 1 (14) is fixedly connected to the outside of the sliding plate (16), one end of the spring 1 (15) is fixedly connected to the inner wall of the cavity 1 (13), and the other end of the spring 1 (15) is fixedly connected to the outside of the sliding plate (16).

7. The multi-layer composite filter air purifier according to claim 3, characterized in that: The outside of the limit plate (21) is slidably connected to the inside of the second cavity (23), the top of the second damper (25) is fixedly connected to the bottom of the limit plate (21), one end of the second spring (24) is fixedly connected to the bottom of the limit plate (21), and the other end of the second spring (24) is fixedly connected to the bottom inner wall of the second cavity (23).

8. The multi-layer composite filter air purifier according to claim 2, characterized in that: The filter layer 1 (2) and the filter layer 3 (4) are both composed of polypropylene fibers, and the filter layer 2 (3) and the filter layer 4 (5) are both provided with activated carbon filter layers.

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