A downdraft air cleaner

Abstract

The utility model discloses a kind of air purifiers of air draught, including the air draught device and filter device that are independent of each other, multiple air intake areas are equipped on the air draught device, and the air supply path that is formed to filter device is gathered, the air outlet area of the air draught device is equipped with first air outlet grille, filter device is detachably arranged on first air outlet grille, and first air outlet grille defines the filter space corresponding to filter device and the air intake space corresponding to air draught device, filter space and air intake space are fluidly connected, with the effect that multi-directional purification, convenient maintenance and reasonable layout.

Description

Technical Field

[0001] This utility model relates to the field of air purification equipment technology, and in particular to a ventilation-type air purifier. Background Technology

[0002] With increasing attention being paid to environmental pollution, air purifiers have become an important device for improving indoor air quality. Common air purifiers typically use fans to force air through a filter to remove particulate matter and gaseous pollutants from the air.

[0003] Current air purifier designs typically employ a single, centralized air intake area. This design can only extract and purify air from a single direction, failing to draw air in from multiple angles and easily creating purification dead zones. Furthermore, existing air purifier designs often integrate the filter and fan into a relatively enclosed cavity. Replacing or cleaning the filter in this design is often cumbersome, potentially requiring disassembly of multiple components or even touching the fan, increasing maintenance costs and the risk of errors. Therefore, an improved air purifier structure is needed to address these issues. Utility Model Content

[0004] The purpose of this invention is to provide a ventilation-type air purifier that offers multi-directional purification, convenient maintenance, and a reasonable layout.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a ventilation-type air purifier, comprising an independent ventilation device and a filter device, wherein the ventilation device is provided with multiple air inlet areas and forms an air supply path that converges to the filter device, the air outlet area of ​​the ventilation device is provided with a first air outlet grille, the filter device is detachably mounted on the first air outlet grille, and the first air outlet grille defines the filtration space corresponding to the filter device and the air inlet space corresponding to the ventilation device, wherein the filtration space and the air inlet space are in fluid communication.

[0006] By adopting the above technical solution, air is extracted from multiple angles, avoiding purification dead zones and improving purification efficiency; the filter device and the exhaust device are independently detachable, avoiding interference between the two devices during maintenance, making maintenance more convenient and reducing the risk of errors.

[0007] A further feature of this invention is that the exhaust device includes a housing, the air inlet area is disposed on the periphery of the housing, the air outlet area and the first air outlet grille are disposed on the top of the housing, and the filtration device includes a protective cover detachably disposed on the first air outlet grille, a filter element disposed inside the protective cover, and a second air outlet grille, wherein the filter element is disposed between the first air outlet grille and the second air outlet grille.

[0008] By adopting the above technical solution, the filter device is prevented from being exposed to the outside world by setting a protective cover, and the air discharged through the first air outlet grille is prevented from overflowing. The discharged air is guided towards the filter element, thereby improving the filtration efficiency.

[0009] A further feature of this invention is that the filtration device includes a support frame and a top plate fixed above the support frame, the filter element is disposed on the support frame, the protective cover is disposed on the first air outlet grille and constrains the airflow into the support frame, the bottom of the support frame is provided with a hollow part, the opening of the hollow part corresponds to the first air outlet grille and is sealed to the first air outlet grille, and the side wall of the support frame is provided with a plurality of first hollow grids, and the support frame is in fluid communication with the filter element through the first hollow grids.

[0010] By adopting the above technical solution, the layout is reasonable and the contact area between the extracted air and the filter element is large, resulting in good filtration effect.

[0011] A further feature of this invention is that a limiting frame is provided between the support frame and the filter element, the limiting frame is provided with a plurality of second hollow grids corresponding to the positions of the first hollow grids, a top cover is provided above the limiting frame, a limiting part extends circumferentially downward from the edge of the side wall of the top cover, the limiting part and the limiting frame together form the receiving space of the filter element, a limiting hook is provided below the top cover, a limiting groove corresponding to the position of the limiting hook is provided at the top of the limiting frame, and a limiting rib that cooperates with the limiting hook is provided below the limiting groove.

[0012] By adopting the above technical solution and structural design, the filter element is stably placed in the containment space and will not come out due to wind or instrument shaking, resulting in a good fixing effect.

[0013] A further feature of this invention is that the protective cover is arranged circumferentially along the filter element, and the protective cover is provided with a handle portion, wherein the first handle portion is configured as a groove recessed into the protective cover.

[0014] By adopting the above technical solution, when the filter device needs to be repaired, the operator can easily put their hand into the slot to lift the protective cover, and can directly remove the entire protective cover containing the filter device. This avoids interference with the ventilation device during maintenance, making maintenance more convenient and reducing the risk of errors.

[0015] A further feature of this invention is that the air inlet area is provided with a plurality of air inlet holes, and each air inlet area is provided with an ultraviolet lamp.

[0016] By adopting the above technical solution and installing ultraviolet lamps inside the air purifier, a variety of functions can be achieved.

[0017] A further feature of this invention is that: a second handle is provided on the housing, and a flap that rotates into the housing is hinged to the second handle; a torsion spring is provided at the hinge of the flap, and the torsion spring is used to drive the flap to reset.

[0018] By adopting the above technical solution, the air purifier can be easily lifted and moved to the desired position. When the second handle is released, the torsion spring causes the flap to spring back, preventing dust from entering.

[0019] A further feature of this invention is that the filtration device further includes a dust removal component disposed between the first air outlet grille and the protective cover. The dust removal component includes a dust removal housing, and spiral blades and a dust-adhesive component disposed within the dust removal housing. The spiral blades define a spiral channel connecting the first air outlet grille and the protective cover within the dust removal housing. The dust-adhesive component has a working state within the dust removal housing and a replacement-ready state extending out of the dust removal housing.

[0020] By adopting the above technical solution, the air discharged through the first air outlet grille enters the spiral channel and generates centrifugal force under the guidance of the spiral blades, which produces an "impact force" on the side wall of the spiral channel, thereby improving the dust removal effect of the dust-adhesive parts on the side wall of the spiral channel.

[0021] A further feature of this invention is that a lifting platform is movably provided on the side wall of the spiral channel, the dust-adhesive component is disposed on the end face of the lifting platform, a first limiting component and a second limiting component are provided on the lifting platform, a first limiting hole corresponding to the position of the first limiting component is provided on the protective cover, and a second limiting hole corresponding to the position of the second limiting component is provided on the inner wall of the spiral channel. When the dust-adhesive component is in working condition, the second limiting component and the second limiting hole cooperate to fix the lifting platform on the inner wall of the spiral channel. When the dust-adhesive component is in a replacement-ready condition, the first limiting component and the first limiting hole cooperate to fix the lifting platform on the protective cover.

[0022] By adopting the above technical solution, the operation is simple and the replacement is convenient.

[0023] This application provides another preferred embodiment, wherein a third limiting hole corresponding to the position of the second limiting member is provided on the upper inner wall of the spiral channel. The diameter of the third limiting hole is adapted to the second limiting member. When the dust-adhesive part is switched from the working state to the replacement state, under the elastic force of the return spring, when the first limiting member is engaged in the first limiting hole, the second limiting member is engaged in the third limiting hole, so that the lifting platform is fixed between the spiral channel and the protective cover, freeing up both hands and allowing the replacement of the dust-adhesive part to be completed without single-handed operation, making the operation more convenient.

[0024] A further feature of this invention is that both the first limiting member and the second limiting member are fixedly connected with a return spring, and the return spring is fixedly mounted on the lifting platform.

[0025] By adopting the above technical solution, the reset spring provides a holding force to the first and second limiting components, ensuring the limiting effect.

[0026] In summary, this utility model has the following beneficial effects:

[0027] 1. The system employs independent ventilation and filtration devices, with the filtration device being detachable. This avoids interference between the two devices during maintenance, making maintenance more convenient and reducing the risk of errors.

[0028] 2. The exhaust device has multiple air intake areas, forming an air supply path that converges to the filter device. This allows for air extraction from multiple angles, avoiding dead zones in the purification process and improving purification efficiency. Attached Figure Description

[0029] Figure 1 This is a perspective view of the present invention.

[0030] Figure 2 This is a cross-sectional view of Embodiment 1 of this utility model.

[0031] Figure 3 This is a cross-sectional view of the filtration device of this utility model.

[0032] Figure 4 This is a utility model Figure 3 A magnified view of A in the middle.

[0033] Figure 5 This is a schematic diagram of the structure of the second handle of this utility model.

[0034] Figure 6 This is a cross-sectional view of the dust-adhesive component in the working state according to Embodiment 2 of this utility model.

[0035] Figure 7This is a cross-sectional view of the dust-adhesive component in the second embodiment of this utility model, in a state awaiting replacement.

[0036] In the diagram: 1. Housing; 11. Second handle; 111. Flip plate; 112. Torsion spring; 12. First limiting hole; 2. Exhaust device; 21. Air inlet area; 211. Air inlet hole; 212. Ultraviolet lamp; 22. Air outlet area; 3. Filter device; 31. Support frame; 311. Hollow section; 312. First hollow grid; 313. Protective cover; 314. First handle; 32. Filter element; 33. Top plate; 34. Limiting frame; 341. Second hollow grid; 342. Top cover; 343. Limiting part; 344. Limiting hook; 345. Limiting groove; 346. Limiting rib; 4. First air outlet grille; 41. Filter space; 42. Air inlet space; 5. Spiral channel; 51. Spiral blade; 52. Dust-adhesive component; 53. Lifting platform; 531. First limiting component; 532. Second limiting component; 54. Second limiting hole; 55. Return spring; 56. Dust collector housing; 6. Second air outlet grille; 7. Third air outlet grille; 8. Support column; 9. Third limiting hole; 91. Pull ring. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings.

[0038] Example 1:

[0039] A type of exhaust-type air purifier, such as Figure 1-5As shown, the device includes an independent exhaust device 2 and a filter device 3. The exhaust device 2 has multiple air inlet areas 21, which form an air supply path that converges to the filter device 3. The exhaust area 22 of the exhaust device 2 has a first air outlet grille 4. The filter device 3 is detachably mounted on the first air outlet grille 4, and the first air outlet grille 4 defines the filtration space 41 corresponding to the filter device 3 and the air inlet space 42 corresponding to the exhaust device 2. The filtration space 41 and the air inlet space 42 are in fluid communication. The exhaust device 2 also includes a housing 1. The air inlet areas 21 are located on the periphery of the housing 1, and the air outlet areas 22 and the first air outlet grille 4 are located on the top of the housing 1. The filter device 3 includes a protective cover 313 detachably mounted on the first air outlet grille 4, a filter element 32 disposed within the protective cover 313, and a second air outlet grille 6. The filter element 32 is disposed between the first air outlet grille 4 and the second air outlet grille 6. The exhaust device 2 is an exhaust fan, and the filter device 3 is detachably installed above the exhaust device 2. Several air inlet areas 21 are arranged circumferentially on the side wall of the casing 1 corresponding to the air inlet space 42, forming multiple horizontal air inlets, which then converge into a vertical upward airflow path for the filter device 3, increasing the air extraction area and improving purification efficiency. The filter device 3 and the exhaust device 2 are independently and detachably installed to avoid interference between the two devices during maintenance, making maintenance more convenient. The first air outlet grille 4 is located at the top of the casing 1 and abuts against the casing 1. The casing 1 and the first air outlet grille 4 enclose the air inlet space 42. The second air outlet grille 6 is located at the top of the protective cover 313 and abuts against the protective cover 313. The protective cover 313 and the second air outlet grille 6 enclose the filtration space 41. The air after passing through the first air outlet grille 4 first passes through the filter element 32 for purification, and the purified air is discharged through the top second air outlet grille 6.

[0040] Preferably, the filtration device 3 includes a support frame 31 and a top plate 33 fixed above the support frame 31. The filter element 32 is disposed on the support frame 31. The protective cover 313 covers the first air outlet grille 4 and restricts the airflow into the support frame 31. The bottom of the support frame 31 is provided with a hollow part 311. The opening of the hollow part 311 corresponds to the first air outlet grille 4 and is sealed to the first air outlet grille 4. The side wall of the support frame 31 is provided with a plurality of first hollow grids 312. The support frame 31 is in fluid communication with the filter element 32 through the first hollow grids 312. The support frame 31 and the protective cover 313 are integrally formed. The edge of the hollow part 311 is in close contact with the first air outlet grille 4. The filter element 32 is circumferentially arranged outside the support frame 31. Several first hollow grilles 312 are circumferentially arranged on the side wall of the support frame 31. The air discharged through the first air outlet grille 4 is blocked by the edge of the hollow part 311 and rises vertically along the hollow part 311. Under the obstruction of the top plate 33, it is forced to disperse towards the side wall of the support frame 31. The air enters the filter element 32 through the first hollow grilles 312 on the side wall of the support frame 31. After passing through the filter element 32, the air rises vertically under the obstruction of the protective cover 313 and is finally discharged at the second air outlet grille 6 on the top of the protective cover 313. The layout is reasonable and the contact area between the extracted air and the filter element 32 is large, resulting in good filtration effect. By setting the protective cover 313 to prevent the air discharged through the first air outlet grille 4 from overflowing and to guide the discharged air towards the filter element 32, the filtration efficiency is improved.

[0041] Preferably, a limiting frame 34 is provided between the support frame 31 and the filter element 32. The limiting frame 34 is provided with a plurality of second hollow grids 341 corresponding to the positions of the first hollow grid 312. A top cover 342 is provided above the limiting frame 34. A limiting part 343 extends circumferentially downward from the side wall edge of the top cover 342. The limiting part 343 and the limiting frame 34 together form the receiving space of the filter element 32. A limiting hook 344 is provided below the top cover 342. A limiting groove 345 corresponding to the position of the limiting hook 344 is provided on the top of the limiting frame 34. A limiting rib 346 that cooperates with the limiting hook 344 for limiting is provided below the limiting groove 345. The limiting frame 34 is circumferentially set outside the side wall of the support frame 31, and its height is greater than that of the top plate 33. The bottom of the side wall of the limiting frame 34 bends outward and upward to form a U-shaped structure. The length of the top cover 342 is greater than the length of the filter element 32, so that the filter element 32 is covered under the top cover 342. The filter element 32 is located between the U-shaped structure and the limiting part 343, forming the aforementioned accommodating space. The limiting hook 344 enters the limiting groove 345 and engages with the limiting rib 346, so that the top cover 342 is fixedly connected to the limiting frame 34. Through the above structural design, the filter element 32 is stably placed in the accommodating space and will not fall out due to wind or instrument shaking, resulting in a good fixing effect.

[0042] Preferably, the protective cover 313 is arranged circumferentially along the filter element 32, and the protective cover 313 is provided with a first handle portion 314, which is configured as a groove recessed into the protective cover 313. The protective cover 313 fits the contour of the outer surface of the housing 1. The first handle portion 314 is configured as a set and symmetrically arranged on the side wall of the protective cover 313. When the filter device 3 needs to be repaired, since the filter device 3 is only mounted on the first air outlet grille 4, the operator can lift the protective cover 313 by placing their hand in the groove, and can directly remove the entire protective cover 313 with the filter device 3. This avoids interference with the exhaust device 2 during maintenance, making maintenance more convenient and reducing the risk of errors.

[0043] Preferably, the air intake area 21 is provided with a plurality of air intake holes 211, and each air intake area 21 is provided with an ultraviolet lamp 212. The ultraviolet lamp 212 is fixedly installed below the exhaust device 2, and the light transmission direction of the ultraviolet lamp 212 faces the air intake hole 211, so as to disinfect the outside air through the air intake hole 211. By setting ultraviolet lamps 212 in the air purifier, the desired effect of multiple functions can be achieved.

[0044] Preferably, the housing 1 is provided with a second handle 11, and a flap 111 that rotates inwards is hinged to the second handle 11. A torsion spring 112 is provided at the hinge of the flap 111, and the torsion spring 112 is used to drive the flap 111 to return to its original position. The second handles 11 are configured as a set and symmetrically arranged on the side wall of the protective cover 313. The torsion spring 112 is wound around the hinge axis of the flap 111, with one end abutting against the back of the flap 111 and the other end abutting against the surface of the housing 1. When the operator inserts their hand into the second handle 11, the flap 111 flips inwards into the housing 1, making it easy to lift the air purifier and move it to the desired position. When the second handle 11 is released, the torsion spring 112 causes the flap 111 to spring back, preventing dust from entering.

[0045] Example 2:

[0046] A type of exhaust-type air purifier, such as Figure 6-7As shown, the difference between this embodiment and specific embodiment one is that the filter device 3 further includes a dust removal component disposed between the first air outlet grille 4 and the protective cover 313. The dust removal component includes a dust removal housing, and a spiral blade 51 and a dust-adhesive component 52 disposed within the dust removal housing. The spiral blade 51 defines a spiral channel 5 connecting the first air outlet grille 4 and the protective cover 313 within the dust removal housing. The dust-adhesive component 52 has a working state within the dust removal housing and a replacement-ready state extending out of the dust removal housing. The spiral channel 5 abuts against the first air outlet grille 4 at the bottom, and a third air outlet grille 7 is provided above it, abutting against the support frame 31, and is vertically continuous. The air discharged through the first air outlet grille 4 enters the spiral channel 5, exits from the third air outlet grille 7, enters the hollow part 311 of the support frame 31, passes through the filter element 32, and finally exits from the second air outlet grille 6. The specific airflow path within the filtration space 41 has been described above, so it will not be repeated here. The spiral blades 51 are fixedly mounted on the support column 8, which is fixedly mounted between the first air outlet grille 4 and the third air outlet grille 7. The dust-adhesive element 52 can be a dust-adhesive paper or a dust-adhesive sticker. The dust-adhesive element 52 is set on the inner wall of the dust collector housing and can move vertically. When the spiral channel 5 moves upward, it is in an open state, and the dust-adhesive part 52 extends out of the dust collector housing to form the replacement state, which makes it convenient for the user to tear off the old dust-adhesive part 52 and replace it with a new one. After replacement, the dust-adhesive part 52 moves downward until it is completely inside the dust collector housing. At this time, the dust collector housing is closed, forming the working state. After the air discharged through the first air outlet grille 4 enters the spiral channel 5, it will generate centrifugal force under the guidance of the spiral blades 51, which will generate "impact force" on the inner wall of the dust collector housing, improving the dust removal effect of the dust-adhesive part 52 on the inner wall of the dust collector housing. In addition, the air passing through the spiral blades 51 will form a vortex, which will increase the airflow speed and make it contact the filter element 32 more quickly, thus improving the filtration efficiency.

[0047] Preferably, a lifting platform 53 is movably disposed on the inner wall of the dust collector housing. The dust-adhesive component 52 is disposed on the end face of the lifting platform 53. A first limiting component 531 and a second limiting component 532 are disposed on the lifting platform 53. A first limiting hole 12 corresponding to the position of the first limiting component 531 is disposed on the protective cover 313. A second limiting hole 54 corresponding to the position of the second limiting component 532 is disposed on the inner wall of the dust collector housing. A return spring 55 is fixedly connected to both the first limiting component 531 and the second limiting component 532. The return spring 55 is fixedly disposed on the lifting platform 53. When the dust-adhesive component 52 is in the working state, the second limiting component 532 and the second limiting hole 54 limit the lifting platform 53 to be fixed on the inner wall of the dust collector housing. When the dust-adhesive component 52 is in the replacement state, the first limiting component 531 and the first limiting hole 12 limit the lifting platform 53 to be fixed on the protective cover 313. Both the first limiting member 531 and the second limiting member 532 are retaining beads. The diameters of the first limiting hole 12 and the second limiting hole 54 are respectively adapted to the corresponding retaining beads. The dust-adhesive part 52 is set on the end face of the lifting platform 53 near the spiral blade 51. A pull ring 91 is set on the top of the lifting platform 53. When the dust-adhesive part 52 is switched from the working state to the waiting-to-replace state, the operator pulls the pull ring 91 upwards by hand. Under the elastic force of the return spring 55, the first limiting member 531 is locked into the first limiting hole 12, completing the positioning function. Then, the old dust is peeled off by hand. Replace the old dust-adhesive part 52 with a new one. When the dust-adhesive part 52 switches from the waiting-to-replace state to the working state, the operator slides the lifting platform 53 into the dust collector housing. Under the elastic force of the return spring 55, the second limiting part 532 is engaged in the second limiting hole 54, completing the fixation of the lower part of the lifting platform 53. At this time, the top of the lifting platform 53 and the third air outlet grille 7 support each other and form the outer surface of the dust collector housing, completing the fixation of the upper part of the lifting platform 53. The upper and lower fixations cooperate to fix the lifting platform 53 in the dust collector housing. The operation is simple and the replacement is convenient.

[0048] This application provides another preferred embodiment, wherein a third limiting hole 9 corresponding to the position of the second limiting member 532 is provided on the upper inner wall of the dust collector housing. The diameter of the third limiting hole 9 is adapted to the second limiting member 532. When the dust-adhesive part 52 switches from the working state to the replacement state, under the elastic force of the return spring 55, when the first limiting member 531 is engaged in the first limiting hole 12, the second limiting member 532 is engaged in the third limiting hole 9, so that the lifting platform 53 is fixed between the dust collector housing and the protective cover 313, freeing up both hands and allowing the replacement of the dust-adhesive part 52 to be completed without single-handed operation, making the operation more convenient.

[0049] Example 3:

[0050] An exhaust-type air purifier, the difference between this embodiment and specific embodiment one is that: the air inlet area 21 is provided with a second filter element (not shown in the figure) corresponding to the position of the air inlet hole 211. The air drawn by the exhaust device 2 is first pre-filtered through the second filter element, and then gathered into a path for air to be sent vertically upward by the filter device 3. The two filtration processes make the air filtration effect better.

[0051] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A type of exhaust-type air purifier, characterized in that: It includes an independent exhaust device (2) and a filter device (3). The exhaust device (2) is provided with multiple air inlet areas (21) and forms an air supply path that converges to the filter device (3). The exhaust area (22) of the exhaust device (2) is provided with a first air outlet grille (4). The filter device (3) is detachably mounted on the first air outlet grille (4), and the first air outlet grille (4) defines the filter space (41) corresponding to the filter device (3) and the air inlet space (42) corresponding to the exhaust device (2). The filter space (41) and the air inlet space (42) are in fluid communication.

2. The exhaust-type air purifier according to claim 1, characterized in that: The exhaust device also includes a housing (1), the air inlet area (21) is disposed on the periphery of the housing (1), the air outlet area (22) and the first air outlet grille (4) are disposed on the top of the housing (1), and the filter device (3) includes a protective cover (313) detachably disposed on the first air outlet grille (4), a filter element (32) disposed in the protective cover (313), and a second air outlet grille (6), wherein the filter element (32) is disposed between the first air outlet grille (4) and the second air outlet grille (6).

3. The exhaust-type air purifier according to claim 2, characterized in that: The filter device (3) includes a support frame (31) and a top plate (33) fixed above the support frame (31). The filter element (32) is disposed on the support frame (31). The protective cover (313) is disposed on the first air outlet grille (4) and restricts the airflow into the support frame (31). A hollow part (311) is provided at the bottom of the support frame (31). The opening of the hollow part (311) corresponds to the first air outlet grille (4) and is sealed to the first air outlet grille (4). A plurality of first hollow grids (312) are provided on the side wall of the support frame (31). The support frame (31) is in fluid communication with the filter element (32) through the first hollow grids (312).

4. The exhaust-type air purifier according to claim 3, characterized in that: A limiting frame (34) is provided between the support frame (31) and the filter element (32). The limiting frame (34) is provided with a plurality of second hollow grids (341) corresponding to the position of the first hollow grid (312). A top cover (342) is provided above the limiting frame (34). A limiting part (343) extends circumferentially downward from the edge of the side wall of the top cover (342). The limiting part (343) and the limiting frame (34) together form the receiving space of the filter element (32). A limiting hook (344) is provided below the top cover (342). A limiting groove (345) corresponding to the position of the limiting hook (344) is provided on the top of the limiting frame (34). A limiting rib (346) that cooperates with the limiting hook (344) is provided below the limiting groove (345).

5. The exhaust-type air purifier according to claim 3, characterized in that: The protective cover (313) is arranged circumferentially along the filter element (32), and the protective cover (313) is provided with a first handle (314), which is configured as a groove recessed into the protective cover (313).

6. The exhaust-type air purifier according to claim 1, characterized in that: The air intake area (21) is provided with a plurality of air intake holes (211), and each air intake area (21) is provided with an ultraviolet lamp (212).

7. The exhaust-type air purifier according to claim 2, characterized in that: The housing (1) is provided with a second handle (11), and a flap (111) that rotates into the housing (1) is hinged to the second handle (11). A torsion spring (112) is provided at the hinge of the flap (111), and the torsion spring (112) is used to drive the flap (111) to reset.

8. The exhaust-type air purifier according to claim 2, characterized in that: The filter device (3) further includes a dust removal assembly disposed between the first air outlet grille (4) and the protective cover (313). The dust removal assembly includes a dust removal housing, and a spiral blade (51) and a dust-adhesive component (52) disposed within the dust removal housing. The spiral blade (51) defines a spiral channel (5) connecting the first air outlet grille (4) and the protective cover (313) within the dust removal housing. The dust-adhesive component (52) has a working state within the dust removal housing and a replacement state extending out of the dust removal housing.

9. The exhaust-type air purifier according to claim 8, characterized in that: A lifting platform (53) is movably provided on the inner wall of the dust removal housing. The dust-adhesive component (52) is provided on the end face of the lifting platform (53). A first limiting component (531) and a second limiting component (532) are provided on the lifting platform (53). A first limiting hole (12) corresponding to the position of the first limiting component (531) is provided on the protective cover (313). A second limiting hole (54) corresponding to the position of the second limiting component (532) is provided on the inner wall of the dust removal housing. When the dust-adhesive component (52) is in the working state, the second limiting component (532) and the second limiting hole (54) limit and cooperate to fix the lifting platform (53) on the inner wall of the dust removal housing. When the dust-adhesive component (52) is in the replacement state, the first limiting component (531) and the first limiting hole (12) limit and cooperate to fix the lifting platform (53) on the protective cover (313).

10. An exhaust-type air purifier according to claim 9, characterized in that: Both the first limiting member (531) and the second limiting member (532) are fixedly connected with a return spring (55), and the return spring (55) is fixedly installed on the lifting platform (53).

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