A filter element structure and an air purifier

Abstract

The present invention provides a filter element structure and an air purifier. The filter element structure includes: a housing provided with an air inlet hole; a filter element placement rack disposed inside the housing, and the filter element placement rack can move inside the housing; a plurality of filter elements with different specifications, which are respectively disposed on the filter element placement rack; wherein, the plurality of filter elements can filter different types of pollutants in the air, and the movement of the filter element placement rack can transport any one of the plurality of filter elements to the air inlet hole to filter the air. Based on the technical solution of the present invention, since the movement of the filter element placement rack can transport any one of the plurality of filter elements to the air inlet hole to filter the air. In this way, a corresponding filter element can be selected to filter a specific type of pollutant in the air. Thereby ensuring that the filter element structure can filter different types of pollutants in the air, and further improving the air filtration and purification effect of the filter element structure.

Description

Technical Field

[0001] The present invention relates to the technical field of air purification equipment, and particularly to a filter element structure and an air purifier. Background Art

[0002] Currently, the filtration and purification method of the filter element structure in the related art is to adsorb and purify pollutants in the air without discrimination, that is, the filter element intercepts and adsorbs pollutants in the air without classification. This kind of adsorption and purification method easily leads to poor filtration and purification effect of the filter element structure.

[0003] That is to say, the filter element structure in the related art has the problem of poor filtration and purification effect. Summary of the Invention

[0004] Aiming at the above problems in the prior art, the present application provides a filter element structure and an air purifier, which solve the problem of poor filtration and purification effect of the filter element structure.

[0005] The filter element structure of the present invention includes: a housing provided with an air inlet hole; a filter element placement rack disposed inside the housing, and the filter element placement rack can move inside the housing; a plurality of filter elements with different specifications, respectively disposed on the filter element placement rack; wherein, the plurality of filter elements can filter different types of pollutants in the air, and the movement of the filter element placement rack can transport any one of the plurality of filter elements to the air inlet hole to filter the air.

[0006] In one embodiment, the air inlet hole is provided on the outer wall surface of the housing, and the filter element placement rack is rotatably disposed inside the housing. Rotate the filter element placement rack to transport any one of the plurality of filter elements to the air inlet hole to filter the air. Through this embodiment, the filter element placement rack realizes the switching and use of a plurality of filter elements with different specifications by rotating. In this way, a corresponding filter element can be selected to filter a specific pollutant in the air. Thus, it is ensured that the filter element structure can filter different types of pollutants in the air, and further improves the filtration and purification effect of the filter element structure on the air.

[0007] In one embodiment, the filter element placement rack is a hollow prism, and each side surface of the prism is provided with an installation groove, and the installation groove communicates with the hollow for installing any one of the plurality of filter elements, and the air enters the hollow after being filtered by the filter element. Through this embodiment, the installation groove has an installation function for fixedly installing the filter element. At the same time, the installation groove also has a conduction function, that is, it conducts the air filtered by the filter element to the hollow of the filter element placement rack, so as to facilitate the discharged air from the air purifier. In addition, the filter element placement rack is set as a prism, which is convenient for fixing a plurality of filter elements at the same time, that is, one filter element can be fixed on each side surface of the prism. And it is convenient to switch a plurality of filter elements, that is, by rotating the prism, the filter element can be switched, thereby improving the convenience of use of the filter element structure.

[0008] In one embodiment, it further includes a tray which can rotate relative to the housing. The housing is arranged on the tray, and the filter element placement rack is fixed on the tray. In this embodiment, the tray has a supporting and fixing function, and is used to support and fix the filter element placement rack arranged thereon and multiple filter elements arranged on the filter element placement rack. Thereby ensuring that the filter element placement rack can rotate stably to switch the filter elements, and further ensuring that the filter element structure can work properly.

[0009] In one embodiment, it further includes a driving structure which is fixedly connected to the tray and is used to drive the tray to rotate relative to the housing. In this embodiment, the driving structure can provide a rotational force for the tray, so as to ensure that the tray can drive the filter element placement rack and the filter elements thereon to rotate, thereby ensuring that the filter elements can be switched normally, and further ensuring that the filter element structure can work properly.

[0010] In one embodiment, the driving structure includes a driving member and a transmission member connected to the driving member. In this embodiment, the driving member provides the power for rotation, and the transmission member has a transmission function and can transmit the torque to the tray to make it rotate. The driving member and the transmission member are used in cooperation to ensure that the tray drives the filter element placement rack and the filter elements thereon to rotate. Thereby ensuring that the filter elements can be switched normally.

[0011] In one embodiment, the transmission member includes a first gear and a second gear meshed with the first gear, wherein the first gear is connected to the driving member and the second gear is fixedly connected to the tray.

[0012] In one embodiment, it further includes a fixing structure arranged between the second gear and the tray and is used to fixedly connect the tray and the second gear. In this embodiment, the fixing structure can fix the tray and the second gear together, make the second gear and the tray rotate synchronously, thereby ensuring the rotation accuracy of the filter elements, and further ensuring the switching accuracy of the filter element structure.

[0013] In one embodiment, a rotation prevention fixing groove is arranged on the tray, and one end of the filter element placement rack is fixed in the rotation prevention fixing groove in a clamping manner. In this embodiment, the rotation prevention fixing groove has an anti-rotation function and can prevent the filter element placement rack from rotating on the tray, thereby avoiding relative rotation between the tray and the filter element placement rack, and further ensuring the filter element switching accuracy of the filter element structure.

[0014] The present invention also provides an air purifier, including: the above-mentioned filter element structure; a controller electrically connected to the monitoring device and the filter element structure; wherein, the controller can control the movement of the filter element placement rack of the filter element structure according to the information of pollutants transmitted by the monitoring device so as to select multiple filter elements with different specifications to purify the air.

[0015] The above technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0016] The filter element structure and air purifier provided by the present invention have at least the following beneficial effects compared with the prior art:

[0017] The movement of the filter element rack allows any of the multiple filter elements to be transported to the air inlet for filtering. This allows the selection of the appropriate filter element for filtering specific air pollutants. This ensures that the filter element structure can filter different types of air pollutants, thereby improving the filter element's air purification effectiveness. Furthermore, the filter element structure includes multiple filter elements, and filter elements of different specifications are switched according to the different types of air pollutants. This reduces the filter element usage efficiency, thereby extending the filter element structure's service life and saving its operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0019] Figure 1 A perspective schematic diagram of the filter element structure of the present invention is shown (the filter element and housing are not shown);

[0020] Figure 2 Shows Figure 1 The front view of the filter element structure in FIG (showing the housing, not the filter element);

[0021] Figure 3 Shows Figure 2 Top view of the filter element structure (arrow indicates the direction of air entry);

[0022] Figure 4 Shows Figure 1 Schematic diagram of the three-dimensional structure of the filter element placement rack;

[0023] Figure 5 Shows Figure 1 A schematic diagram of the three-dimensional structure of the tray and part of the fixed structure;

[0024] Figure 6 Shows Figure 1 Schematic diagram of the structure of the tray;

[0025] Figure 7 Shows Figure 1 A schematic diagram of the three-dimensional structure of the second gear and part of the fixed structure;

[0026] Figure 8 Shows Figure 1 Assembly diagram of the tray, fixing structure and second gear;

[0027] Figure 9 Shows a schematic diagram of the module composition of the air purifier of the present invention.

[0028] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale.

[0029] Reference numerals:

[0030] 10. Housing; 11. Air inlet hole; 20. Filter element placement rack; 21. Installation groove; 30. Tray; 31. Anti-rotation fixing groove; 40. Driving structure; 41. Driving member; 42. Transmission member; 421. First gear; 422. Second gear; 4221. Ring body; 4222. Meshing teeth; 50. Fixing structure; 51. Buckle; 52. Limiting member; 53. Second limiting groove; 54. Card slot; 55. Limiting rib; 56. First limiting groove; 57. First connecting body; 58. Second connecting body; 100. Filter element structure; 200. Monitoring device; 300. Controller. Detailed implementation manners

[0031] The present invention will be further described below with reference to the drawings.

[0032] As Figure 1 and Figure 2 shown, the present invention provides a filter element structure, which includes a housing 10, a filter element placement rack 20, and a plurality of filter elements with different specifications. Among them, the housing 10 is provided with an air inlet hole 11. The filter element placement rack 20 is arranged inside the housing 10, and the filter element placement rack 20 can move inside the housing 10. A plurality of filter elements with different specifications are respectively arranged on the filter element placement rack 20. The plurality of filter elements can filter different types of pollutants in the air, and the movement of the filter element placement rack 20 can transport any one of the plurality of filter elements to the air inlet hole 11 to filter the air.

[0033] In the above setting, since the movement of the filter element placement rack 20 can transport any one of the plurality of filter elements to the air inlet hole 11 to filter the air. In this way, a corresponding filter element can be selected to filter a specific type of pollutant in the air. Thereby ensuring that the filter element structure can filter different types of pollutants in the air, and further improving the air filtering and purification effect of the filter element structure. Moreover, the filter element structure includes a plurality of filter elements, and according to different types of pollutants in the air, filter elements with different specifications are switched for filtering. Thereby reducing the use efficiency of the filter element, thereby prolonging the service life of the filter element structure and saving its use cost.

[0034] It should be noted that in the related art, generally a single filter element of one specification is used to filter different types of pollutants in the air, which results in frequent use of the filter element and is likely to cause damage due to its frequent use. In addition, in the related art, multiple filter elements of different specifications are also integrated together to form a composite filter element to filter air simultaneously. When the service life of a single pollutant filter element expires, the entire composite filter element needs to be replaced. Since the diameters of the pollutants in the air are inconsistent, the service lives of other pollutant filter elements may not have expired yet, leading to waste. Among multiple filter elements of different specifications, by selecting a filter element in an alternative manner, the usage frequency of the filter element is reduced, thereby prolonging the service life of the filter element structure and saving its usage cost.

[0035] Specifically, as Figure 2 shown, in one embodiment, the air inlet hole 11 is provided on the outer wall surface of the housing 10, and the filter element placement rack 20 is rotatably provided in the housing 10. The filter element placement rack 20 is rotated to transport any one of the multiple filter elements to the air inlet hole 11 to filter air.

[0036] In the above setting, the filter element placement rack 20 realizes the switching and use of multiple filter elements of different specifications by rotation. In this way, a corresponding filter element can be selected for filtering according to a specific pollutant in the air. Thus, it is ensured that the filter element structure can filter different types of pollutants in the air, and further improves the air filtering and purification effect of the filter element structure.

[0037] Specifically, as Figure 2 shown, in one embodiment, the housing 10 is a cylindrical body. The air inlet hole 11 is provided on the outer circumferential surface of the cylindrical body.

[0038] Specifically, as Figure 1 and Figure 2 shown, in one embodiment, the filter element placement rack 20 rotates around the central axis direction of the cylindrical body.

[0039] Specifically, as Figure 2 shown, in one embodiment, the number of the air inlet holes 11 is multiple, and the multiple air inlet holes 11 are distributed in a rectangular matrix.

[0040] Specifically, as Figure 2 shown, in one embodiment, the rectangular matrix is: distributed in 13 rows x 17 columns.

[0041] Of course, in alternative embodiments not shown in the drawings of the present application, the multiple air inlet holes 11 may be distributed in a circular matrix or other shapes.

[0042] Specifically, as Figure 4As shown, in one embodiment, the filter element placement rack 20 is a hollow prism, and mounting grooves 21 are provided on each side surface of the prism. The mounting grooves 21 communicate with the hollow interior and are used to mount any one of a plurality of filter elements. Air enters the hollow interior after being filtered by the filter element.

[0043] In the above arrangement, the mounting groove 21 has a mounting function for fixedly mounting the filter element. At the same time, the mounting groove 21 also has a conduction function, that is, it conducts the air filtered by the filter element to the hollow of the filter element placement rack 20, so as to facilitate the discharged air filtered from the air purifier. In addition, the filter element placement rack 20 is set as a prism, which is convenient for fixing a plurality of filter elements at the same time, that is, one filter element can be fixed on each side surface of the prism. And it is convenient to switch between a plurality of filter elements, that is, by rotating the prism, the filter element can be switched, thereby improving the convenience of using the filter element structure.

[0044] Specifically, as Figure 1 、 Figure 3 and Figure 4 shown, in one embodiment, the filter element placement rack 20 is a hexagonal prism, and it is provided with an axial through hole (hollow).

[0045] Of course, in embodiments not shown in the drawings of the present application, the filter element placement rack 20 can be set as a prism of other shapes such as a quadrangular prism or an octagonal prism.

[0046] Specifically, as Figure 1 and Figure 4 shown, in one embodiment, a plurality of mounting grooves 21 are provided on each side surface of the hexagonal prism. The mounting grooves 21 are rectangular and penetrate the side surface and the axial through hole. Air enters from the air inlet hole 11, is filtered by the filter element, and the filtered air converges into the axial through hole through the mounting grooves 21.

[0047] Specifically, as Figure 4 shown, in one embodiment, a plurality of mounting grooves 21 are arranged in a matrix.

[0048] It should be noted that the filter element in the present application is a mesh structure, that is, a filter screen. The specific shape and arrangement of the mounting grooves 21 can be arranged according to the specifically selected filter screen structure, and the arrangement form and shape of the mounting grooves 21 are not limited to the arrangement form and shape in the present application.

[0049] Specifically, as Figure 2 、 Figure 5 and Figure 6 shown, in one embodiment, the filter element structure 100 further includes a tray 30. The tray 30 can rotate relative to the housing 10. The housing 10 is arranged on the tray 30, and the filter element placement rack 20 is fixed on the tray 30.

[0050] In the above setting, the tray 30 has a supporting and fixing function, and is used to support and fix the filter element placement rack 20 arranged thereon and a plurality of filter elements arranged on the filter element placement rack 20. Thereby ensuring that the filter element placement rack 20 can rotate stably to switch the filter elements, and further ensuring that the filter element structure 100 can work normally.

[0051] Specifically, as Figures 1 to 3 shown, in one embodiment, the filter element structure 100 further includes a driving structure 40, and the driving structure 40 is fixedly connected to the tray 30 and is used to drive the tray 30 to rotate relative to the housing 10.

[0052] In the above setting, the driving structure 40 can provide a rotational force for the tray 30, so as to ensure that the tray 30 can drive the filter element placement rack 20 and the filter elements thereon to rotate, thereby ensuring that the filter elements can be switched normally, and further ensuring that the filter element structure can work normally.

[0053] Specifically, as Figure 2 shown, in one embodiment, the driving structure 40 includes a driving member 41 and a transmission member 42 connected to the driving member 41.

[0054] In the above setting, the driving member 41 provides the power of rotation, and the transmission member 42 has a transmission function and can transmit the torque to the tray 30 to make it rotate. The driving member 41 and the transmission member 42 are used in cooperation to ensure that the tray 30 drives the filter element placement rack 20 and the filter elements thereon to rotate. Thereby ensuring that the filter elements can be switched normally.

[0055] Specifically, as Figure 2 、 Figure 7 and Figure 8 shown, in one embodiment, the transmission member 42 includes a first gear 421 and a second gear 422 meshed with the first gear 421, wherein the first gear 421 is connected to the driving member 41, and the second gear 422 is fixedly connected to the tray 30.

[0056] Specifically, as Figure 2 shown, in one embodiment, the driving member is a driving motor. The first gear 421 is a conventional gear. The driving shaft of the driving motor is connected to the central shaft hole of the first gear 421, and the driving shaft drives the first gear 421 to rotate.

[0057] Specifically, as Figure 2 、 Figure 7 and Figure 8 shown, in one embodiment, the structure of the second gear 422 is not conventional. It includes a toroidal body 4221 and meshing teeth 4222 arranged on the end face of the toroidal body 4221. The meshing teeth 4222 extend circumferentially around the toroidal body 4221. And the tooth-shaped meshing surface is arranged away from its central axis in the radial direction of the toroidal body 4221.

[0058] Specifically, as shown in Figure 1 , Figure 5 , Figure 7 and Figure 8 , in one embodiment, the filter element structure 100 further includes a fixing structure 50. The fixing structure 50 is disposed between the second gear 422 and the tray 30 and is used to fixedly connect the tray 30 and the second gear 422.

[0059] In the above arrangement, the fixing structure 50 can fix the tray 30 and the second gear 422 together, enabling the second gear 422 and the tray 30 to rotate synchronously, thereby ensuring the rotation accuracy of the filter element and further ensuring the switching accuracy of the filter element structure 100.

[0060] Specifically, as shown in Figure 8 , in one embodiment, the fixing structure 50 includes a buckle structure and a limiting structure. The cooperation of the buckle structure and the limiting structure can prevent relative rotation between the second gear 422 and the tray 30, thereby ensuring the filter element switching accuracy of the filter element structure 100.

[0061] Specifically, as shown in Figure 5 , in one embodiment, the buckle structure includes a plurality of buckles 51. The plurality of buckles 51 are spaced apart on the lower end surface of the tray 30 and are circumferentially distributed along the tray 30.

[0062] Specifically, as shown in Figure 7 , in one embodiment, the buckle structure further includes a plurality of card slots 54. The plurality of card slots 54 are spaced apart on the upper end surface of the second gear 422 and are circumferentially spaced along the second gear 422. The plurality of card slots 54 are arranged in one-to-one correspondence with the plurality of buckles 51.

[0063] Optionally, as shown in Figure 5 , in one embodiment, the number of buckles 51 is 6. Correspondingly, the number of card slots 5 is 6. Of course, other numbers of buckles 51 and card slots 54 can be set according to actual situations. The buckles 51 are snap-connected to the card slots 54.

[0064] Specifically, as shown in Figure 7 , in one embodiment, the limiting structure includes six limiting ribs 55. The six limiting ribs 55 are evenly spaced around the central axis of the second gear 422. One end of the limiting rib 55 is connected to the inner wall surface of the second gear 422, and the other end is connected to the first connecting body 57. An adjacent pair of limiting ribs 55 and the second gear 422 define a first limiting groove 56.

[0065] Specifically, as shown in Figure 8As shown, in one embodiment, the limiting structure further includes six limiting members 52, which are arranged on the lower end surface of the tray 30 and are evenly spaced along the circumference of the tray 30. Two adjacent limiting members 52 and the tray 30 define a second limiting groove 53.

[0066] It should be noted that the limiting member 52 and the first limiting groove 56 are nested, and the limiting rib 55 and the second limiting groove 53 are nested. Moreover, when the limiting member 52 and the first limiting groove 56 are nested, the limiting rib 55 and the second limiting groove 53 are nested simultaneously.

[0067] Specifically, as Figure 1 and Figure 5 shown, in one embodiment, the limiting member 52 includes three limiting plates, which are connected to each other to form a triangular ring-like structure. The apex angle of the triangular ring-like structure faces the central axis of the tray 30 and is connected to the second connecting body 58. Both the first connecting body 57 and the second connecting body 58 are provided with connecting holes. When the second gear 422, the tray 30, and the fixing structure 50 are assembled together, a connecting member can be passed through the connecting holes to connect the second gear 422 and the tray 30 together.

[0068] Specifically, as Figure 6 shown, in one embodiment, a rotation-preventing fixing groove 31 is provided on the upper end surface of the tray 30, and one end of the filter element placement rack 20 is fixed in the rotation-preventing fixing groove 31 in a snap-fit manner.

[0069] In the above setting, the rotation-preventing fixing groove 31 has the function of preventing rotation, which can prevent the filter element placement rack 20 from rotating on the tray 30, thereby avoiding relative rotation between the tray 30 and the filter element placement rack 20, and further ensuring the filter element switching accuracy of the filter element structure.

[0070] Specifically, as Figure 6 shown, in one embodiment, the rotation-preventing fixing groove 31 is arranged in a hexagonal-like structure, that is, a hexagon with one corner missing, which is defined by four plate bodies and the upper end surface of the tray 30. The bottom end of the filter element placement rack 20 is snap-fitted in the rotation-preventing fixing groove 31.

[0071] As Figure 9 shown, the present invention also provides an air purifier, which includes a monitoring device 200, the above-mentioned filter element structure 100, and a controller 300. Among them, the monitoring device 200 is used to monitor pollutants in the air. The controller 300 is electrically connected to the monitoring device 200 and the filter element structure 100. The controller 300 can control the movement of the filter element placement rack 20 of the filter element structure 100 according to the information of the pollutants transmitted by the monitoring device 200 to select multiple filter elements with different specifications to purify the air.

[0072] Specifically, in one embodiment, the monitoring device 200 is a sensor, and the controller 300 includes a controller.

[0073] The working process of the air purifier in this application is described below as follows:

[0074] The sensor detects the external air quality and feeds back the values of various pollutants to the control board. The controller compares the values of various pollutants detected with the preset values, and the comparison results are divided into three cases:

[0075] 1. The detected values of all pollutants < preset values, the whole machine pauses working and reminds the user.

[0076] 2. Among the various pollutants detected, only one pollutant has a detected feedback value ≥ preset value, then the control board controls the first gear 421 to drive the tray 30 to rotate, and rotates the filter element corresponding to the pollutant to the air inlet hole 11 to purify and remove the specific pollutant.

[0077] 3. Among the various pollutants detected, multiple pollutants have detected feedback values ≥ preset values. The control board compares the pollutants exceeding the preset values. According to this comparison result, the first gear 421 rotates to sequentially rotate the corresponding filter elements to the air inlet in descending order, and purifies and removes the pollutants in turn. Thus, the pollutants are purified and removed specifically.

[0078] The above working process is further illustrated by examples below:

[0079] The whole machine can remove three pollutants, PM2.5, formaldehyde, and TVOC. The preset values of these three pollutants are all 100. The values of the three pollutants detected by the sensor for the external air are 120, 150, and 160 respectively. The differences between the three pollutants and the preset values are 20, 50, and 60 respectively. Then, the filter elements for removing TVOC, formaldehyde, and PM2.5 are rotated to the air inlet in turn to remove the pollutants (the corresponding filter elements are rotated to the air inlet in descending order to purify and remove the pollutants in turn).

[0080] The air purifier in this application has the following characteristics:

[0081] 1. Each side of the filter element placement rack 20 is designed with a hollow air inlet grille (a hollow air inlet grille is formed after setting the installation groove 21), and each side can be independently installed and replaced with a filter element.

[0082] 2. The tray 30 is designed with an anti-rotation fixing groove 31 to prevent the filter element from rotating during the rotation of the tray.

[0083] 3. A gear is arranged at the bottom of the tray of the filter element placement rack 20 and is connected thereto. The rotation of the tray 30 can be controlled through the meshing movement of the two gears. The tray 30 and the gear are mutually assembled through the buckle 51 and the card slot 54 to make the two fastened.

[0084] 4. The rotation of the filter element placement rack 20 only aligns one side of the filter element placement rack 20 with the orifice of the air inlet hole 11, so that the external air can only pass through the filter element on this side.

[0085] 5. According to the feedback of the sensor on the air quality, the corresponding pollutants are purified specifically (graded), which prolongs the service life of the filter element.

[0086] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0087] Although the present invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed, as long as they do not deviate from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein can be combined in a manner different from that described in the original claims. It should also be understood that the features described in connection with a single embodiment can be used in other described embodiments.

Claims

1. A filter element structure, characterized in that Comprising: A housing provided with air inlet holes; A filter element placement rack disposed within the housing, and the filter element placement rack is capable of moving within the housing; Multiple filter elements of different specifications, respectively disposed on the filter element placement rack; A tray, the tray is capable of rotating relative to the housing, the housing is disposed on the tray, and the filter element placement rack is fixed on the tray; A driving structure, the driving structure is fixedly connected to the tray and is used to drive the tray to rotate relative to the housing. The driving structure includes a driving member and a transmission member connected to the driving member. The transmission member includes a first gear and a second gear meshed with the first gear. Wherein the first gear is connected to the driving member, and the second gear is fixedly connected to the tray; A fixing structure, the fixing structure is disposed between the second gear and the tray and is used to fixedly connect the tray and the second gear. The fixing structure includes a buckle structure and a limiting structure. The buckle structure and the limiting structure are used in cooperation to prevent relative rotation between the second gear and the tray; Wherein, the multiple filter elements are capable of filtering different types of pollutants in the air, and the movement of the filter element placement rack can transport any one of the multiple filter elements to the air inlet holes to filter the air; A rotation prevention fixing groove is provided on the tray, and one end of the filter element placement rack is fixed in the rotation prevention fixing groove in a clamping manner. The rotation prevention fixing groove is set to a quasi-hexagonal structure, and the rotation prevention fixing groove is defined by four plate bodies and the upper end surface of the tray.

2. The filter element structure according to claim 1, characterized in that, The air inlet holes are provided on the outer wall surface of the housing, and the filter element placement rack is rotatably disposed within the housing. Rotate the filter element placement rack to transport any one of the multiple filter elements to the air inlet holes to filter the air.

3. The filter element structure according to claim 2, characterized in that, The filter element placement rack is a hollow prism, and mounting grooves are provided on each side surface of the prism. The mounting grooves communicate with the hollow and are used to mount any one of the multiple filter elements. The air enters the hollow after being filtered by the filter element.

4. An air purifier, characterized in that, Comprising: A monitoring device for monitoring pollutants in the air; The filter element structure according to any one of claims 1 to 3; A controller electrically connected to the monitoring device and the filter element structure; Wherein, the controller can control the movement of the filter element placement rack of the filter element structure according to the information of the pollutants transmitted by the monitoring device, so as to select multiple filter elements of different specifications to purify the air.

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