Air filter element and air filter

Abstract

The utility model provides an air filter element and an air filter. The air filter element comprises a limiting end cover; the air outlet end cover and the limiting end cover are arranged at an interval in the vertical direction of the air filter element and provided with an air outlet; the front filtering module is vertically clamped between the limiting end cover and the air outlet end cover, the front filtering module is provided with an air inlet flow channel and an air outlet flow channel, one end of the air inlet flow channel communicates with the outside atmosphere, the other end of the air inlet flow channel communicates with the air outlet flow channel, and the air outlet flow channel communicates with the air outlet; the plurality of filter material bearing supports are all arranged in the air outlet flow channel, the plurality of filter material bearing supports are sequentially arranged in the vertical direction of the air outlet flow channel, an air passing flow channel is formed between every two adjacent filter material bearing supports, the air passing flow channels are communicated with the air inlet flow channel and the air outlet flow channel, and the filter material bearing supports are provided with a plurality of air passing holes; the plurality of air passing holes are communicated with the air passing flow channel and the air outlet flow channel; and each filter material bearing bracket is filled with the filter material. The air purification performance can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air filtration, and in particular to an air filtration filter element and an air filter. BACKGROUND

[0002] The air filtration filter element realizes air purification through physical filtration and chemical adsorption mechanisms, and mainly comprises a limiting end cover, a pre-filter module, an activated carbon filter module and an air outlet end cover. The pre-filter module is vertically clamped between the limiting end cover and the air outlet end cover. The side wall of the pre-filter module has an air inlet flow channel, and the outer end of the air inlet flow channel is connected to the outside air. The inner peripheral wall of the pre-filter module forms an air outlet flow channel, and the air outlet flow channel is connected to the inner end of the air inlet flow channel. The activated carbon filter module is arranged in the air outlet flow channel. The air outlet end cover has a plurality of air outlet holes, and the plurality of air outlet holes are connected to the air outlet flow channel to output purified air.

[0003] However, in actual application, the activated carbon filter module mainly comprises a cylindrical filter screen and activated carbon. The cylindrical filter screen is arranged around the axial center line of the pre-filter module, and the activated carbon is filled on the surface of the cylindrical filter screen. The activated carbon can only be distributed on a limited two-dimensional surface, which leads to a low activated carbon loading, and further restricts the overall purification performance of the air filtration filter element. CONTENT OF THE UTILITY MODEL

[0004] The embodiments of the present application provide an air filtration filter element and an air filter to solve the problem of low overall purification performance of the air filtration filter element in the related art. The technical solutions are as follows:

[0005] In a first aspect, the embodiments of the present application provide an air filtration filter element, comprising:

[0006] a limiting end cover;

[0007] an air outlet end cover, the air outlet end cover and the limiting end cover being arranged apart along the vertical direction of the air filtration filter element, and the air outlet end cover having an air outlet;

[0008] a pre-filter module, the pre-filter module being vertically clamped between the limiting end cover and the air outlet end cover, the pre-filter module having an air inlet flow channel and an air outlet flow channel, one end of the air inlet flow channel being connected to the outside air, the other end of the air inlet flow channel being connected to the air outlet flow channel, the air outlet flow channel being connected to the air outlet, and the air outlet flow channel extending along the vertical direction of the air filtration filter element, the pre-filter module being used to intercept particulate pollutants in the airflow passing through the air inlet flow channel;

[0009] a plurality of filter material carrying supports, each of the plurality of filter material carrying supports is arranged in the air outlet flow channel, the plurality of filter material carrying supports are arranged in sequence along the vertical direction of the air outlet flow channel, an air flow channel is formed between two adjacent filter material carrying supports, the air flow channel is connected to the air inlet flow channel and the air outlet flow channel, the filter material carrying support has a plurality of air flow holes, each of the plurality of air flow holes is connected to the air flow channel and the air outlet flow channel; and

[0010] filter material, the filter material is filled in each of the filter material carrying supports, and the filter material is used to filter volatile organic pollutants, odors, oil fumes and particulate pollutants in the air flow passing through the filter material carrying support.

[0011] In an embodiment, the bottom of the filter material carrying support is provided with a first connecting part, and the top of the filter material carrying support is provided with a second connecting part.

[0012] In two adjacent filter material carrying supports, the second connecting part of the lower one and the first connecting part of the upper one are connected to connect the two adjacent filter material carrying supports together.

[0013] In an embodiment, the second connecting part has a connecting hole, and the connecting hole and the corresponding first connecting part are inserted and matched.

[0014] In an embodiment, the first connecting part is provided with an insertion part at one end away from the filter material carrying support, the insertion part and the connecting hole are inserted and matched, and the cross section of the insertion part gradually decreases in the direction away from the filter material carrying support.

[0015] In an embodiment, the filter material carrying support comprises:

[0016] a support body, the support body has the air flow holes;

[0017] a plurality of material carrying plates, the first end of each of the plurality of material carrying plates is connected to the outer periphery of the support body, the plurality of material carrying plates are arranged around the support body, the plurality of material carrying plates are located between two adjacent filter material carrying supports, the air flow channel is formed between two adjacent material carrying plates, and the material carrying plate is used to carry filter material; and

[0018] a supporting component, the supporting component is connected to the second end of each of the plurality of material carrying plates, the supporting component is arranged around the vertical center line of the support body, and the supporting component is used to carry filter material.

[0019] In an embodiment, the material carrying plate is arranged obliquely, so that the air flow channel is configured to be parallel to the air inlet flow channel.

[0020] In an embodiment, the bottom of the bracket body is provided with a first connecting part, and the top of the bracket body is provided with a second connecting part.

[0021] The second connecting part of the lower one of the two adjacent filter material bearing brackets and the first connecting part of the upper one of the two adjacent filter material bearing brackets are connected to connect the two adjacent filter material bearing brackets together.

[0022] In an embodiment, the pre-filter module comprises:

[0023] A foldable filter paper having the air inlet flow channel and the air outlet flow channel, the foldable filter paper being used to filter first particulate pollutants in the air flow passing through the air inlet flow channel.

[0024] In an embodiment, the pre-filter module further comprises:

[0025] A primary filter screen provided on the outer peripheral wall of the foldable filter paper, the primary filter screen being arranged around the vertical center line of the foldable filter paper, the primary filter screen being used to intercept second particulate pollutants in the air flow before entering the foldable filter paper, the second particulate pollutants having an outer diameter greater than that of the first particulate pollutants.

[0026] In a second aspect, the embodiments of the present application provide an air filter comprising the air filter cartridge.

[0027] The advantages or beneficial effects of the above technical solutions at least include:

[0028] The air filtering filter element of the utility model, due to setting multiple filter material bearing supports in the air outlet flow channel, multiple filter material bearing supports are sequentially arranged along the vertical direction of the air outlet flow channel, form a longitudinal layered structure, and filter material is filled on each filter material bearing support, that is, each filter material bearing support independently bears filter material, forms a multi-layer three-dimensional filter material structure, that is, realizes three-dimensional stacking of filter material, changes filter material from traditional planar distribution to three-dimensional distribution, significantly increases the filter material filling amount in a unit volume, thereby can improve the adsorption capacity of filter material, not only can improve the purification performance of the air filtering filter element, but also can prolong the service life of the air filtering filter element, simultaneously, since multiple filter material bearing supports are arranged along the vertical direction of the air outlet flow channel of the air filtering filter element, the filter material bearing supports have multiple air passing holes, and the multiple air passing holes are connected through the air inlet flow channel and the air outlet flow channel, not only can improve the space utilization rate of the air outlet flow channel, but also can make airflow penetrate multiple filter material layers in XYZ three directions, thereby can efficiently filter airflow by filter material, simultaneously, can maintain reasonable pressure loss, ensure airflow efficiency, thereby ensure air purification efficiency. In conclusion, the air filtering filter element breaks through the two-dimensional filter material filling limitation of traditional air filtering filter elements, can realize synergistic improvement of filter material filling amount and airflow efficiency under the premise of maintaining reasonable pressure loss, not only can improve air purification efficiency (that is, can improve air purification performance), but also can prolong the service life of the air filtering filter element.

[0029] The above summary is intended to illustrate only and is not intended to be limiting in any way. Further aspects, implementations, and features of the present application will be apparent from the drawings and the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0030] In the drawings, like reference numerals will be used to indicate like or similar elements throughout the several views. The drawings are not necessarily to scale. It should be understood that the drawings only depict some embodiments in accordance with the disclosure and should not be considered limiting.

[0031] Figure 1 is a schematic diagram of the three-dimensional structure of the air filtering filter element of the utility model;

[0032] Figure 2 is an exploded view of the air filtering filter element of the utility model;

[0033] Figure 3 is a schematic diagram of the three-dimensional structure of the filter material bearing support of the first embodiment in the utility model;

[0034] Figure 4 is Figure 3 is a schematic diagram of the three-dimensional structure of the filter material bearing support group in the utility model assembled together;

[0035] Figure 5 is a schematic view of the three-dimensional structure of the filter material bearing support of the second embodiment of the present application;

[0036] Figure 6 is Figure 5 a schematic view of the three-dimensional structure of the filter material bearing support assembled together.

[0037] Reference signs

[0038] 1, limit end cover; 2, air outlet end cover; 21, air outlet; 3, pre-filter module; 31, folding filter paper; 311, air outlet flow channel; 32, primary filter screen; 4, filter material bearing support; 41, support main body; 411, air passing hole; 412, first connecting part; 4121, plug-in part; 413, second connecting part; 4131, connecting hole; 42, material carrying plate; 43, supporting part; 44, air passing flow channel. DETAILED DESCRIPTION

[0039] In the following, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0040] Referring to Figures 1-6 , a kind of air filter cartridge of a preferred embodiment of the present application is shown, comprising:

[0041] limit end cover 1;

[0042] air outlet end cover 2, air outlet end cover 2 and limit end cover 1 are vertically spaced apart along the air filter cartridge, air outlet end cover 2 has air outlet 21;

[0043] pre-filter module 3, pre-filter module 3 is vertically clamped between limit end cover 1 and air outlet end cover 2, pre-filter module 3 has air inlet flow channel (not shown in the figure) and air outlet flow channel 311, air inlet flow channel is transversely arranged, that is, air inlet flow channel extends along the transverse direction of the air filter cartridge, one end of air inlet flow channel is communicated with the outside atmosphere, the other end of air inlet flow channel is communicated with air outlet flow channel 311, air outlet flow channel 311 is located at the center of pre-filter module 3, air outlet flow channel 311 is vertically arranged, that is, air outlet flow channel 311 extends along the vertical direction of the air filter cartridge, air outlet flow channel 311 is communicated with air outlet 21, pre-filter module 3 is used to intercept particulate pollutants in the airflow passing through air inlet flow channel;

[0044] A plurality of filter material carrying supports 4 are arranged in the air outlet flow channel 311, and the plurality of filter material carrying supports 4 are arranged in sequence along the vertical direction of the air outlet flow channel 311, that is, the plurality of filter material carrying supports 4 are arranged in sequence along the vertical direction of the air filter element, and an air flow channel 44 is formed between adjacent two filter material carrying supports 4, the air flow channel 44 is connected with the air inlet flow channel and the air outlet flow channel 311, the filter material carrying support 4 has a plurality of air flow holes 411, and the plurality of air flow holes 411 are connected with the air flow channel 44 and the air outlet flow channel 311; and

[0045] Filter material (not shown in the figure), the filter material is filled in each filter material carrying support 4, and the filter material is used for filtering volatile organic pollutants, odors, oil fumes and particulate pollutants in the airflow passing through the filter material carrying support 4.

[0046] The air filter element of the utility model, since in the air outlet flow channel 311 set up a plurality of filter material carrying supports 4, a plurality of filter material carrying supports 4 along the vertical direction of the air outlet flow channel 311 arrange in sequence, form longitudinal stratification structure, and filter material fills in each filter material carrying support 4, that is, each filter material carrying support 4 is independently carried filter material, form multilayer three-dimensional filter material structure, that is, realize the three-dimensional stacking of filter material, make filter material change from traditional plane distribution to three-dimensional distribution, significantly increase the filter material filling amount in unit volume, so as to be able to improve the adsorption capacity of filter material, not only can improve the purification performance of air filter element, but also can prolong the service life of air filter element, simultaneously, since a plurality of filter material carrying supports 4 along the vertical direction of the air outlet flow channel 311 of air filter element arrange in sequence, filter material carrying support 4 has a plurality of air flow holes 411 and the plurality of air flow holes 411 are connected with the air flow channel 44 and the air outlet flow channel 311, can improve the space utilization of air outlet flow channel 311, and can make airflow penetrate multilayer filter material layer in XYZ three directions, so as to be able to use filter material to carry out efficient filtration to airflow, and can maintain reasonable pressure loss, ensure airflow efficiency, so as to ensure air purification efficiency. In conclusion, the air filter element breaks through the two-dimensional filter material filling limitation of traditional air filter element, and can realize the synergistic improvement of filter material filling amount and airflow efficiency under the premise of maintaining reasonable pressure loss, not only can improve air purification efficiency (that is, can improve air purification performance), but also can prolong the service life of air filter element.

[0047] Wherein, it can be understood that the above-mentioned filter material can be activated carbon, or porous ceramic, zeolite, photocatalyst, electrocatalyst, transition metal and its oxide, etc., mainly used for filtering volatile organic pollutants (such as formaldehyde, benzene, toluene, xylene, ethanol, acetone, etc.), odors, oil fumes and particulate pollutants in airflow, and the filter material is specifically bonded on the filter material carrying support 4 by glue.

[0048] In an embodiment, the hole wall of the air passing hole 411 is also used to carry the filter material, that is, the hole wall of the air passing hole 411 can carry the filter material, so as to improve the space utilization of the hole wall of the air passing hole 411, avoid wasting space, and further increase the filter material filling amount.

[0049] Referring to Figures 3-6 In an embodiment, the bottom of the filter material carrying support 4 is provided with a first connecting part 412, and the top of the filter material carrying support 4 is provided with a second connecting part 413.

[0050] The second connecting part 413 of the lower one and the first connecting part 412 of the upper one of the two adjacent filter material carrying supports 4 are connected, so as to connect the two adjacent filter material carrying supports 4 together. In this way, the vertical stable stacking of the plurality of filter material carrying supports 4 is realized through the cooperation of the first connecting part 412 (bottom) and the second connecting part 413 (top).

[0051] In an embodiment, the second connecting part 413 has a connecting hole 4131, and the connecting hole 4131 and the corresponding first connecting part 412 are inserted and matched, that is, the first connecting part 412 and the second connecting part 413 are inserted, so as to facilitate the rapid assembly of the two adjacent filter material carrying supports 4 without tools, while ensuring that the two adjacent filter material carrying supports 4 are reliably connected together, and further realizing the non-destructive disassembly of the two adjacent filter material carrying supports 4.

[0052] Of course, in other embodiments, the first connecting part 412 and the second connecting part 413 can also be connected by clamping or by screwing.

[0053] In an embodiment, the end of the first connecting part 412 away from the filter material carrying support 4 is provided with an insertion part 4121, the insertion part 4121 and the connecting hole 4131 are inserted and matched, and the cross section of the insertion part 4121 gradually decreases away from the filter material carrying support 4, so as to form a conical or pyramidal self-guiding structure, thereby automatically correcting the positional deviation when inserted into the connecting hole 4131, improving the assembly efficiency, and realizing “insertion and locking”, so as to reliably connect the first connecting part 412 and the second connecting part 413 together.

[0054] In an embodiment, the cross section of the air passing hole 411 is polygonal, so as to increase the hole wall area of the air passing hole 411, further increase the filter material filling amount, and further increase the cross section area of the air passing hole 411, which is beneficial to reduce the air resistance, so as to further reduce the noise during the operation of the air filter element.

[0055] In an embodiment, the cross section of the overwind hole 411 is hexagonal, the bracket body 41 is formed into a honeycomb structure, the pressure loss is reduced, the air flow efficiency is improved, and the air purification efficiency is improved.

[0056] Of course, in other embodiments, the cross section of the overwind hole 411 can be circular, triangular, or other special shapes.

[0057] In an embodiment, the filter material carrying bracket 4 comprises:

[0058] The bracket body 41 has an overwind hole 411;

[0059] The plurality of material carrying plates 42 are connected to the outer periphery of the bracket body 41, arranged around the bracket body 41, located between two adjacent filter material carrying brackets 4, and form an overwind flow channel 44 between two adjacent material carrying plates 42. The material carrying plate 42 is used to carry the filter material, further increasing the filter material filling amount, and further improving the purification performance of the air filter element; and

[0060] The supporting component 43 is connected to the second end of the plurality of material carrying plates 42 to form a stable frame structure, which improves the wind resistance performance of the filter material carrying bracket 4, and makes the filter material less likely to shift or collapse. The supporting component 43 is arranged around the vertical center line of the bracket body 41, and the wall surface of the supporting component 43 can carry the filter material to further increase the filter material filling amount and further improve the purification performance of the air filter element.

[0061] In an embodiment, the material carrying plate 42 is arranged obliquely, that is, the material carrying plate 42 is at an angle to the tangential direction of the outer periphery of the bracket body 41, so that the overwind flow channel 44 is approximately parallel to the inlet flow channel, which reduces the wind resistance and thus reduces the noise during operation of the air filter element.

[0062] In an embodiment, the vertical projection area of the bracket body 41 is within the vertical projection area of the supporting component 43, that is, the outer diameter of the supporting component 43 is greater than the outer diameter of the bracket body 41. In this way, since the supporting component 43 is the main supporting frame of the filter material carrying bracket 4, it can stably support the bracket body 41, the material carrying plate 42, and the filter material, and further improve the wind resistance performance of the filter material carrying bracket 4, making the filter material less likely to shift or collapse.

[0063] In an embodiment, the bottom of the bracket body 41 is provided with a first connecting part 412, and the top of the bracket body 41 is provided with a second connecting part 413, that is, the first connecting part 412 and the second connecting part 413 are arranged on the bracket body 41.

[0064] The second connecting part 413 of the lower one and the first connecting part 412 of the upper one of the two adjacent filter material carrying supports 4 are connected to connect the two adjacent filter material carrying supports 4 together.

[0065] Referring to Figures 1-2 In an embodiment, the pre-filter module 3 comprises:

[0066] The folded filter paper 31 has an air inlet flow channel and an air outlet flow channel 311, and is used to filter first particulate pollutants in the airflow passing through the air inlet flow channel, so as to reduce the burden of the filter material and prolong the service life of the air filter cartridge.

[0067] Referring to Figures 1-2 In an embodiment, the pre-filter module 3 further comprises:

[0068] The primary efficiency filter screen 32 is arranged on the outer peripheral wall of the folded filter paper 31 and surrounds the vertical center line of the folded filter paper 31, and is used to intercept second particulate pollutants in the airflow entering the folded filter paper 31, the outer diameter of the second particulate pollutants being larger than that of the first particulate pollutants, i.e., the second particulate pollutants are mainly large particulate pollutants, so as to reduce the burden of the folded filter paper 31 and prolong the service life of the air filter cartridge.

[0069] The air filter according to the preferred embodiment of the present application comprises the air filter cartridge.

[0070] The air filter of the utility model, since multiple filter material bearing supports 4 are arranged in the air outlet flow channel 311, the multiple filter material bearing supports 4 are sequentially arranged along the vertical direction of the air outlet flow channel 311, a longitudinal layered structure is formed, and the filter material is filled in each filter material bearing support 4, that is, each filter material bearing support 4 independently bears the filter material, a multi-layer three-dimensional filter material structure is formed, that is, the filter material is stacked in three dimensions, the filter material is changed from traditional planar distribution to three-dimensional distribution, the filter material filling amount in a unit volume is significantly increased, the adsorption capacity of the filter material is improved, the purification performance of the air filter element is improved, and the service life of the air filter element is prolonged, simultaneously, since the multiple filter material bearing supports 4 are arranged along the vertical direction of the air outlet flow channel 311 of the air filter element, the filter material bearing support 4 has multiple air flow holes 411, and the multiple air flow holes 411 are connected by the air flow channel 44 and the air outlet flow channel 311, the space utilization of the air outlet flow channel 311 is improved, and the air flow can penetrate the multiple filter material layers in XYZ three directions, so that the air flow is efficiently filtered by the filter material, reasonable pressure loss is maintained, air flow efficiency is ensured, and air purification efficiency is ensured.

[0071] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0072] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one feature. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0073] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various changes or replacements within the technical range disclosed by the present application, and these should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An air filter cartridge, characterized by, The air filter cartridge comprises: a limiting end cover; an air outlet end cover, which is arranged vertically apart from the limiting end cover along the air filter cartridge, and has an air outlet; a pre-filter module, which is vertically sandwiched between the limiting end cover and the air outlet end cover, has an air inlet flow channel and an air outlet flow channel, one end of the air inlet flow channel is connected to the outside atmosphere, the other end of the air inlet flow channel is connected to the air outlet flow channel, the air outlet flow channel is connected to the air outlet, the air outlet flow channel extends vertically along the air filter cartridge, and the pre-filter module is used for intercepting particulate pollutants in airflow passing through the air inlet flow channel; a plurality of filter material bearing supports, each of which is arranged in the air outlet flow channel, and is arranged in sequence along the vertical direction of the air outlet flow channel, and an air flow channel is formed between any two adjacent filter material bearing supports, the air flow channel is connected to the air inlet flow channel and the air outlet flow channel, and each filter material bearing support has a plurality of air flow holes, each of which is connected to the air flow channel and the air outlet flow channel; and filter material, which is filled in each filter material bearing support, and is used for filtering volatile organic pollutants, odors, oil fumes and particulate pollutants in airflow passing through the filter material bearing support. The bottom of the filter material bearing support is provided with a first connecting part, and the top of the filter material bearing support is provided with a second connecting part.

2. The air filtration cartridge of claim 1 wherein, The second connecting part of the lower one and the first connecting part of the upper one of any two adjacent filter material bearing supports are connected to connect the two together. The second connecting part has a connecting hole which is inserted into the corresponding first connecting part.

3. The air filtration cartridge of claim 2, wherein, The end of the first connecting part away from the filter material bearing support is provided with an insertion part which is inserted into the connecting hole, and the cross section of the insertion part gradually decreases away from the filter material bearing support.

4. The air filter cartridge of claim 3 wherein, The filter material bearing support comprises:

5. The air filter cartridge of claim 1 wherein, a support body having the air flow holes; a plurality of filter material bearing plates, the first ends of which are connected to the outer periphery of the support body, the filter material bearing plates are arranged around the support body, and the filter material bearing plates are arranged between any two adjacent filter material bearing supports to form the air flow channel therebetween, and the filter material bearing plates are used for bearing filter material; and a supporting part connected to the second ends of the filter material bearing plates, which is arranged around the vertical center line of the support body, and is used for bearing filter material. The filter material bearing plates are arranged obliquely so that the air flow channel is parallel to the air inlet flow channel.

6. The air filter cartridge of claim 5 wherein, The bottom of the support body is provided with a first connecting part, and the top of the support body is provided with a second connecting part.

7. The air filter cartridge of claim 5 wherein, The second connecting part of the lower one and the first connecting part of the upper one of any two adjacent filter material bearing supports are connected to connect the two together. The pre-filter module comprises:

8. The air filter cartridge of claim 1 wherein, ​ A pleated filter paper having the air inlet flow channel and the air outlet flow channel, the pleated filter paper being used for filtering first particulate contaminants in an air flow passing through the air inlet flow channel.

9. The air filter cartridge of claim 8 wherein, The pre-filter module further comprises: A primary filter screen provided on an outer peripheral wall of the pleated filter paper, the primary filter screen being disposed around a vertical center line of the pleated filter paper, the primary filter screen being used for intercepting second particulate contaminants in an air flow before entering the pleated filter paper, the second particulate contaminants having an outer diameter greater than that of the first particulate contaminants.

10. An air filter, characterized by An air filter cartridge comprising the air filter cartridge of any one of claims 1-9.

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