Multi-layer filtering air purification equipment

Abstract

The invention relates to the technical field of air purification, in particular to multi-layer filtering air purification equipment. The equipment comprises an equipment body, the equipment body comprises a shell structure, a twitching piece is fixedly installed in the shell structure, the shell structure comprises two first side shell plates and two second side shell plates, a filter element set is arranged in the shell structure, and the filter element set comprises a primary-efficiency filter element, a medium-efficiency filter element and an inner-layer filter element. The driving gear is rotated to drive the extension disc connected with the fluted disc and the primary-effect filter element to rotate together, so that the primary-effect filter element originally close to the air inlet hole is rotated to one side close to the second side shell plate, and the primary-effect filter element originally far away from the air inlet hole is replaced to the original position close to the air inlet hole; the working time of a single filter element is prolonged, the distribution condition of impurities intercepted by each primary-efficiency filter element can be balanced, the overall efficiency of primary-efficiency filtering is improved, and the service life of the filter element is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of air purification, in particular to a multi-layer filtering air purification device. Background Art

[0002] As people pay more and more attention to air quality, air purification equipment has been widely used in various places, such as homes and offices. Most of the existing air purification equipment uses fans as the power source to extract air. Under the action of the motor driving the fan to rotate, negative pressure is generated at the air inlet of the equipment, so that the external air enters the equipment for purification. The air passes through the primary filter, the medium filter, and the sub-high efficiency or high efficiency filter and other multi-stage filtering devices in turn to remove dust, hair, bacteria, viruses and other pollutants. Finally, the purified air is blown out through the air outlet to provide clean air for the indoor environment.

[0003] However, existing indoor air purification devices usually have a variety of structural designs. Due to the comprehensive consideration of factors such as the operation panel, appearance, and other internal functional structure layout, the air inlet often cannot completely occupy the entire surface space of the device. For example, in the air purifier of Chinese patent publication number CN205073819U, the whole presents a cylindrical tower structure, and the air inlet is composed of an array of openings located at the bottom of the tower;

[0004] When air enters the device, it will first impact the filter area near the entrance, which causes the filter part near the entrance to bear a larger air flow and impurity load. During long-term use, the blockage here is more serious. The filter area far away from the air inlet has relatively less air circulation and the number of impurities intercepted is also significantly less, which makes the distribution of impurities on the entire filter extremely uneven. This uneven distribution of impurities brings many inconveniences to the maintenance and cleaning of the equipment. When the filter needs to be disassembled and cleaned, due to the large difference in the degree of blockage in various places, a unified simple cleaning method cannot be adopted, and the entire filter must be fully processed, which undoubtedly reduces the maintenance efficiency of the air purification equipment and increases the user's use cost and inconvenience.

[0005] In view of this, there is an urgent need for a multi-layer filtration air purification device to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a multi-layer filtering air purification device to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides a multi-layer filtration air purification device, including a device body, the device body including a shell structure, a pumping member is fixedly installed inside the shell structure, the shell structure includes two first side shell plates and two second side shell plates, the two first side shell plates and the two second side shell plates are staggered, the tops of the two first side shell plates and the two second side shell plates are connected to the top shell, the surface of the top shell is provided with an air outlet, and the surfaces of the two first side shell plates are provided with a plurality of air inlet holes;

[0008] A filter element group is arranged inside the housing structure, and the filter element group includes a primary filter element, a medium filter element and an inner filter element. The primary filter element is sleeved on the outside of the medium filter element, and the medium filter element is sleeved on the outside of the inner filter element. A side rod assembly is arranged on the surface of the primary filter element, and the side rod assembly is used to provide auxiliary support for the upper end portion of the primary filter element.

[0009] The primary filter element can be rotated to replace the filter side. At the same time, the rotation of the primary filter element can also force the side rod assembly to clean the impurities blocked on the surface of the primary filter element and the medium filter element.

[0010] As a further improvement of the present technical solution, the shell structure also includes a bottom shell, which is connected to the bottom ends of the two first side shell plates and the two second side shell plates, a mounting hole is opened in the middle of the bottom shell, and mounting rings are installed between the two first side shell plates and the two second side shell plates and the top shell and the bottom shell.

[0011] As a further improvement of the present technical solution, the primary filter element is composed of two first filter areas and two replacement filter areas, and the two first filter areas and the two replacement filter areas are installed alternately. The bottom of the primary filter element extends out of the surface of the bottom shell through the installation hole, and one end of the primary filter element extending out of the bottom shell is fixed with an extension plate by bolts, and a locking group is provided on the surface of the extension plate.

[0012] As a further improvement of the technical solution, the lock assembly includes a toothed disc fixedly mounted on the inner wall surface of the extension disc, the surface of the toothed disc is meshedly connected with a driving gear, and the driving gear is rotatably mounted on the bottom of the bottom shell.

[0013] As a further improvement of the present technical solution, the side rod assembly includes an inner support rod installed on the surface of the primary filter element, and four inner support rods are provided. The ends of the four inner support rods away from the primary filter element are all in contact with the surface of the medium-efficiency filter element, and the inner walls of the two second side shell plates are fixedly installed with a plurality of outer columns. Two top support bars are fixedly installed on the bottom of the upper end of the pulling member, and the top of the primary filter element is rotatably clamped on the inside of the outer top support bar, and the top of the medium-efficiency filter element is fixedly clamped on the inside of the inner top support bar.

[0014] As a further improvement of the technical solution, side hook grooves are provided on one end surface of the four inner support rods close to the medium-efficiency filter element and one side surface of several outer columns close to the primary-efficiency filter element.

[0015] As a further improvement of the technical solution, the surfaces of the toothed disc and the bottom shell are both provided with indicator marks.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In the multi-layer filtration air purification device, the shell of the air purification device is composed of two first side shell plates, two second side shell plates, a top shell and a bottom shell. This structural design makes it easy to disassemble the shell, and then to replace the filter element group inside it. The filter element group is composed of a primary filter element, a medium-efficiency filter element and an inner filter element, and can perform multi-layer filtration and purification on the air drawn in by the pumping member, and finally discharge the purified air from the air outlet of the top shell;

[0018] During the normal operation of the equipment body, when air flows into the equipment from the air inlet, it will first impact the primary filter area near the air inlet, and then drive the extension disc connected to the toothed disc and the primary filter element to rotate together by rotating the active gear, so that the primary filter element originally close to the air inlet is rotated to the side close to the second side shell plate, and the primary filter element originally far from the air inlet is replaced to the original position close to the air inlet, which prolongs the working time of a single filter element, and can balance the distribution of impurities intercepted by each primary filter element, thereby improving the overall efficiency of the primary filtration and the service life of the filter element;

[0019] At the same time, the side rod assembly installed inside the shell structure can, on the one hand, provide support for the primary filter element; on the other hand, during the rotation of the primary filter element, the side rod assembly can also perform simple dust removal operations on the surface of the primary filter element and the medium filter element, thereby enhancing the performance of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2It is a schematic diagram of the exploded structure of the housing structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the internal structure of the shell structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the primary filtration using the first filtration zone in the present invention;

[0024] Figure 5 This is a schematic diagram of the primary filtration structure using a replacement filtration area in the present invention;

[0025] Figure 6 For the present invention Figure 6 A schematic diagram of the structure at A;

[0026] Figure 7 It is a front view of the air inlet and outlet structure of the present invention;

[0027] Figure 8 It is a schematic diagram of the bottom shell structure of the present invention;

[0028] Fig. 9 It is a schematic diagram of the structure of the primary filter element of the present invention;

[0029] Fig.10 For the present invention Fig. 9 Schematic diagram of the structure at B;

[0030] Fig.11 It is a bottom view of the overall structure of the present invention.

[0031] The meaning of each number in the figure is:

[0032] 1. Equipment body; 11. Shell structure; 12. Air inlet; 13. Filter element group; 14. Pumping part; 15. Air outlet;

[0033] 111, top shell; 112, first side shell plate; 113, second side shell plate; 114, bottom shell; 115, mounting ring;

[0034] 131. Primary filter element; 132. Medium filter element; 133. Inner filter element;

[0035] 21. First filter area; 22. Replacement filter area; 23. Extension plate; 24. Locking assembly;

[0036] 241, toothed disc; 242, driving gear;

[0037] 3. Side bar assembly; 31. Outer side column; 32. Inner support bar; 33. Top support bar;

[0038] 4. Side hook groove;

[0039] 5. Signpost. DETAILED DESCRIPTION

[0040] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0041] For examples, see Figure 1-Figure 4 As shown, the purpose of this embodiment is to provide a multi-layer filtration air purification device, including a device body 1, the device body 1 includes a shell structure 11, a pumping member 14 is fixedly installed inside the shell structure 11, the shell structure 11 includes two first side shell plates 112 and two second side shell plates 113, the two first side shell plates 112 and the two second side shell plates 113 are staggered, the tops of the two first side shell plates 112 and the two second side shell plates 113 are connected to the top shell 111, the surface of the top shell 111 is provided with an air outlet 15, and the surfaces of the two first side shell plates 112 are provided with a plurality of air inlet holes 12;

[0042] A filter element group 13 is arranged inside the shell structure 11, and the filter element group 13 includes a primary filter element 131, a medium-efficiency filter element 132 and an inner filter element 133. The primary filter element 131 is sleeved on the outside of the medium-efficiency filter element 132, and the medium-efficiency filter element 132 is sleeved on the outside of the inner filter element 133. A side rod assembly 3 is arranged on the surface of the primary filter element 131, and the side rod assembly 3 is used to auxiliary support the upper end part of the primary filter element 131. The primary filter element 131 can be rotated to replace the filter side. At the same time, the rotation of the primary filter element 131 can also force the side rod assembly 3 to clean the impurities blocked on the surface of the primary filter element 131 and the medium-efficiency filter element 132.

[0043] First, the specific structure of the shell structure 11 is disclosed. The shell structure 11 also includes a bottom shell 114, which is connected to the bottom ends of the two first side shell plates 112 and the two second side shell plates 113. A mounting hole is opened in the middle of the bottom shell 114, and mounting rings 115 are installed between the two first side shell plates 112 and the two second side shell plates 113 and the top shell 111 and the bottom shell 114.

[0044] See also Figure 2As shown, the two first side shell plates 112 and the two second side shell plates 113 are connected in an interlaced sealed manner, and their tops and bottoms are respectively installed in the top shell 111 and the bottom shell 114 in a plug-in manner. At the same time, the top shell 111, the bottom shell 114 and the two first side shell plates 112 and the two second side shell plates 113 are sealed and fixed by means of mounting rings 115 (the mounting rings 115 can be connected by bolts, which are not shown in the figure), which enables the shell of the equipment body 1 to be disassembled as a whole, thereby greatly facilitating the disassembly operation of the filter element group 13 and the subsequent installation process.

[0045] The primary filter element 131 is composed of two first filter areas 21 and two replacement filter areas 22. The two first filter areas 21 and the two replacement filter areas 22 are installed in an alternating manner. The bottom of the primary filter element 131 extends out of the surface of the bottom shell 114 through the installation hole. One end of the primary filter element 131 extending out of the bottom shell 114 is fixed with an extension plate 23 by bolts, and a locking group 24 is provided on the surface of the extension plate 23.

[0046] The lock assembly 24 includes a toothed disc 241 fixedly mounted on the inner wall surface of the extension disc 23 . A driving gear 242 is meshedly connected to the surface of the toothed disc 241 . The driving gear 242 is rotatably mounted on the bottom of the bottom shell 114 .

[0047] The primary filter element 131 is movably installed inside the equipment body 1. Therefore, the primary filter element 131 can be auxiliary supported by the side rod assembly 3. The specific structure of the side rod assembly 3 is disclosed below. The side rod assembly 3 includes an inner support rod 32 installed on the surface of the primary filter element 131. Four inner support rods 32 are provided. The ends of the four inner support rods 32 away from the primary filter element 131 are all in contact with the surface of the medium-efficiency filter element 132. The inner walls of the two second side shell plates 113 are fixedly installed with a plurality of outer columns 31. Two top support bars 33 are fixedly installed on the upper bottom of the pulling member 14. The top of the primary filter element 131 is rotatably clamped in the inside of the outer top support bar 33, and the top of the medium-efficiency filter element 132 is fixedly clamped in the inside of the inner top support bar 33.

[0048] Combination Figure 3 and Figure 7It can be seen that inside the device body 1, the filter elements are nested to achieve multi-layer filtration and purification of the air, wherein the primary filter element 131 is placed near the air inlet 12 to intercept larger particles of impurities, such as dust, hair, etc. The medium-efficiency filter element 132 is sleeved in the middle of the primary filter element 131, and its filtration accuracy is higher than that of the primary filter element 131, and it can further capture smaller particles, while the inner filter element 133 is located in the middle of the medium-efficiency filter element 132, and has a more refined filtration capability. From the primary filter element 131 to the medium-efficiency filter element 132 and then to the inner filter element 133, the filter pore size on its surface tends to decrease, so that when the air passes through each filter element in turn, impurities and pollutants of different particle sizes can be gradually removed, thereby ensuring that the air after multi-layer filtration reaches a higher purification standard and effectively improves the air quality.

[0049] like Figure 8 and Fig. 9 As shown, when installing the primary filter element 131, align the bottom of the primary filter element 131 with the installation hole pre-opened in the middle of the bottom shell 114, and then pass it through the installation hole. Then, use bolts to connect the extension plate 23 located inside the bottom shell 114 and the bottom of the primary filter element 131. It should be noted that when the extension plate 23 is installed, the toothed plate 241 and the driving gear 242 need to be in a meshing connection state to complete the installation of the primary filter element 131.

[0050] Combination Figure 4 The interior of the primary filter element 131 is divided into four areas, including two first filter areas 21 and two replacement filter areas 22. The four areas are staggered. After the primary filter element 131 is installed, the two first filter areas 21 are located close to the two first side shell plates 112, which also means close to the air inlet 12. At the same time, the two replacement filter areas 22 are close to the second side shell plate 113. Fig.10 As shown, after the device body 1 has been running for a period of time, the two first filter areas 21 will be relatively blocked, and the driving gear 242 is rotated. Due to the meshing connection between the toothed disc 241 and the driving gear 242, the rotation of the driving gear 242 will drive the toothed disc 241 to rotate synchronously, and then drive the extension disc 23 connected to the toothed disc 241 and the primary filter element 131 to rotate together, Figure 5 It can be seen that as the primary filter element 131 rotates, the replacement filter area 22 originally close to the second side shell plate 113 will be rotated to the position of the previous first filter area 21, thereby realizing the replacement operation of the filter area. Through this filter area replacement mechanism, the filtration load of each area of ​​the primary filter element 131 can be effectively balanced, thereby extending the overall service life of the primary filter element 131 and improving the air purification efficiency and stability of the equipment.

[0051] See also Figure 6 As shown, an inner support rod 32 is installed on one side of the primary filter element 131 close to the medium-efficiency filter element 132. When the device starts the rotation program of the primary filter element 131, the inner support rod 32 will generate relative movement with the surface of the medium-efficiency filter element 132, thereby scraping and cleaning the surface of the medium-efficiency filter element 132. At the same time, a plurality of outer columns 31 are installed on the inner walls of the two second side shell plates 113. When the primary filter element 131 rotates, the surface of the primary filter element 131 will contact and rub against these outer columns 31. This contact can effectively clean the surface of the primary filter element 131 and remove some dust and impurities adsorbed on its surface.

[0052] It is worth mentioning that in the process of cleaning the surface of the primary filter element 131, since these outer columns 31 are installed horizontally, they have unique advantages in cleaning long-shaped dust such as hair. When hair and other dust come into contact with the outer columns 31, they will be hooked by them and will not easily fall into the bottom shell 114 of the device. In this way, the possibility of accumulation of hair and other impurities in the bottom shell 114 is greatly reduced, thereby avoiding the normal rotation of the primary filter element 131 due to problems such as hair entanglement, further improving the reliability and stability of the equipment.

[0053] During the operation of the equipment body 1, these outer columns 31 can effectively support and fix the primary filter element 131 installed in a movably manner. When the equipment is subjected to external vibrations or shaking due to the impact of internal airflow, the primary filter element 131 can maintain a relatively stable position and posture by virtue of the contact with many outer columns 31, thereby improving its stability during operation, reducing problems such as poor filtering effect caused by displacement or shaking, and ensuring the reliable operation and efficient work of the entire air purification equipment.

[0054] In order to further improve the cleaning effect of the primary filter element 131 and the medium filter element 132, side hook grooves 4 are provided on one end surface of the four inner support rods 32 close to the medium filter element 132 and one side surface of the plurality of outer columns 31 close to the primary filter element 131.

[0055] The improvement lies in: combining Figure 6 It can be seen that when the inner support rod 32 and the outer column 31 come into contact with the corresponding filter element during equipment operation, the side hook groove 4 can, by virtue of its unique shape and structure, hook those impurities on the surface of the filter element that are more stubborn, small and difficult to be removed by conventional cleaning methods, thereby improving the cleaning effect.

[0056] Among them, the working principle of the inner filter element 133 is mainly adsorption cleaning. The impurities adsorbed during operation are relatively small, and its adsorption characteristics also make it difficult for impurities to accumulate on the surface in large quantities. Therefore, from the perspective of maintaining the overall operating efficiency and cost of the equipment, the inner filter element 133 does not need to be cleaned as frequently as the primary filter element 131 and the medium filter element 132. It only needs to be properly inspected and maintained when the equipment undergoes regular comprehensive maintenance.

[0057] In order to further determine the rotational positions of the first filter area 21 and the replacement filter area 22 , indicator marks 5 are provided on the surfaces of the toothed disc 241 and the bottom shell 114 .

[0058] The improvements are: See Fig.11 As shown, indicator marks 5 are provided on the surfaces of the toothed disc 241 and the bottom shell 114. By observing the relative position changes of the indicator marks 5, the rotation of the first filter area 21 and the replacement filter area 22 in the primary filter element 131 can be clearly understood, which is convenient for users to better understand the operating status of the equipment, perform maintenance and adjustments in time, and ensure that the filtering function of the equipment can be effectively exerted.

[0059] in, Figure 4 , Figure 5 and Figure 7 The dotted arrow in the figure indicates the direction of air entry.

[0060] In summary, the working principle of this scheme is as follows: inside the device body 1, the filter elements are arranged in a nested manner to achieve multi-layer filtration and purification of the air, wherein the primary filter element 131 is placed near the air inlet 12 to intercept larger particles of impurities, such as dust, hair, etc. The medium-efficiency filter element 132 is sleeved in the middle of the primary filter element 131, and its filtration accuracy is higher than that of the primary filter element 131, and it can further capture smaller particles, while the inner filter element 133 is located in the middle of the medium-efficiency filter element 132, and has a more refined filtration ability. When the air passes through each filter element in turn, impurities and pollutants of different particle sizes can be gradually removed, thereby ensuring that the air after multi-layer filtration reaches a higher purification standard and effectively improves the air quality;

[0061] When the device body 1 has been running for a period of time, the two first filter areas 21 will be relatively blocked, and the driving gear 242 is rotated. Due to the meshing connection between the toothed disc 241 and the driving gear 242, the rotation of the driving gear 242 will drive the toothed disc 241 to rotate synchronously, and then drive the extension disc 23 connected to the toothed disc 241 and the primary filter element 131 to rotate together. As the primary filter element 131 rotates, the replacement filter area 22 originally close to the second side shell plate 113 will be rotated to the position of the previous first filter area 21, so that the replacement operation of the filter area is realized. Through this filter area replacement mechanism, the filtration load of each area of ​​the primary filter element 131 can be effectively balanced, and the overall service life of the primary filter element 131 can be extended;

[0062] When the equipment starts the rotation program of the primary filter element 131, the inner support rod 32 will produce relative movement with the surface of the medium-efficiency filter element 132, thereby scraping and cleaning the surface of the medium-efficiency filter element 132. At the same time, the inner walls of the two second side shell plates 113 are installed with a number of outer columns 31. When the primary filter element 131 rotates, the surface of the primary filter element 131 will contact and rub against these outer columns 31. This contact can effectively clean the surface of the primary filter element 131 and remove some dust and impurities adsorbed on its surface. After the equipment body 1 has been used as a whole for a period of time, it is necessary to disassemble the shell as a whole and clean the interior of the equipment body 1 as a whole.

[0063] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A multi-layer filtration air purification device, comprising a device body (1), characterized in that: The device body (1) comprises a shell structure (11), a pumping member (14) is fixedly installed inside the shell structure (11), the shell structure (11) comprises two first side shell plates (112) and two second side shell plates (113), the two first side shell plates (112) and the two second side shell plates (113) are staggered, the tops of the two first side shell plates (112) and the two second side shell plates (113) are connected to the top shell (111), the surface of the top shell (111) is provided with an air outlet (15), and the surfaces of the two first side shell plates (112) are provided with a plurality of air inlet holes (12); A filter element group (13) is arranged inside the shell structure (11), and the filter element group (13) comprises a primary filter element (131), a medium-efficiency filter element (132) and an inner filter element (133); the primary filter element (131) is sleeved on the outside of the medium-efficiency filter element (132), and the medium-efficiency filter element (132) is sleeved on the outside of the inner filter element (133); a side rod assembly (3) is arranged on the surface of the primary filter element (131), and the side rod assembly (3) is used to provide auxiliary support for the upper end portion of the primary filter element (131); The primary filter element (131) can be rotated to replace the filter side. At the same time, the rotation of the primary filter element (131) can also force the side rod assembly (3) to clean the impurities blocked on the surface of the primary filter element (131) and the medium filter element (132).

2. The multi-layer filtration air purification device according to claim 1, characterized in that: The shell structure (11) further comprises a bottom shell (114), wherein the bottom shell (114) is connected to the bottom ends of the two first side shell plates (112) and the two second side shell plates (113); a mounting hole is provided in the middle of the bottom shell (114); and mounting rings (115) are installed between the two first side shell plates (112) and the two second side shell plates (113) and the top shell (111) and the bottom shell (114).

3. The multi-layer filtration air purification device according to claim 2, characterized in that: The primary filter element (131) is composed of two first filter areas (21) and two replacement filter areas (22), the two first filter areas (21) and the two replacement filter areas (22) are installed in a staggered manner, the bottom of the primary filter element (131) extends through the installation hole and extends out of the surface of the bottom shell (114), one end of the primary filter element (131) extending out of the bottom shell (114) is fixedly installed with an extension plate (23) by means of bolts, and a locking group (24) is provided on the surface of the extension plate (23).

4. The multi-layer filtration air purification device according to claim 3, characterized in that: The lock assembly (24) comprises a toothed disc (241) fixedly mounted on the inner wall surface of the extension disc (23); a driving gear (242) is meshedly connected to the surface of the toothed disc (241); and the driving gear (242) is rotatably mounted on the bottom of the bottom shell (114).

5. The multi-layer filtration air purification device according to claim 3, characterized in that: The side rod assembly (3) includes an inner support rod (32) installed on the surface of the primary filter element (131), and four inner support rods (32) are provided. The ends of the four inner support rods (32) away from the primary filter element (131) are all in contact with the surface of the medium-efficiency filter element (132). The inner walls of the two second side shell plates (113) are fixedly installed with a plurality of outer columns (31). The upper bottom of the pulling member (14) is fixedly installed with two top support bars (33). The top of the primary filter element (131) is rotatably clamped inside the outer top support bar (33), and the top of the medium-efficiency filter element (132) is fixedly clamped inside the inner top support bar (33).

6. The multi-layer filtration air purification device according to claim 5, characterized in that: Side hook grooves (4) are provided on one end surface of the four inner support rods (32) close to the medium-efficiency filter element (132) and one side surface of a plurality of outer columns (31) close to the primary-efficiency filter element (131).

7. The multi-layer filtration air purification device according to claim 4, characterized in that: Indicator marks (5) are provided on the surfaces of the toothed disc (241) and the bottom shell (114).

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