Plate type filter element structure and air filter cleaning system

Abstract

The utility model provides a plate-type filter element structure and an air filter cleaning system, and solves the problem that a cylindrical filter element structure in the prior art cannot take both small occupied space and stable form into account. The filtering device comprises a filtering enclosure frame, wherein a containing groove is formed in the filtering enclosure frame; the adhesive edge strip is adhered to the edge of the filter element, the filter element is arranged in the accommodating groove, and the edge of the filter element is adhered to the inner side edge of the corresponding filter enclosure frame through the adhesive edge strip; and the positioning clamping piece is arranged on the filter element in a clamping manner, is connected with the adhesive edge strip and is used for shaping the filter element.

Description

Technical Field

[0001] This utility model relates to the field of air filtration technology, and in particular to a plate filter element structure and an air filter cleaning system. Background Technology

[0002] In the field of air filtration, the filter element structure plays a crucial role in the filtration effect. Currently, traditional filter element structures have some shortcomings.

[0003] Traditional filter cartridges often use a cylindrical structure. This structure can cover the entire air inlet and outlet channels and has good structural strength, thus providing a better sealing effect, as shown in Chinese patent CN222368469U. However, because this cylindrical structure requires a certain vertical height, it is difficult to assemble in many space-constrained devices, especially in some heavy-duty truck equipment that requires dust removal.

[0004] Meanwhile, filter elements of other shapes or structures lack an effective shaping structure, making them prone to deformation during use, affecting filtration efficiency and lifespan. For example, a filter element may change shape due to airflow impact or external pressure, leading to a decrease in filtration accuracy.

[0005] Furthermore, the cleaning methods for filter cartridges also have shortcomings. Traditional filter cartridges are difficult to clean conveniently and effectively. They generally lack a dedicated cleaning opening design, making it impossible to blow and clean the surface of the filter cartridge from the side. As a result, impurities adhering to the filter cartridge are difficult to remove, and long-term accumulation will seriously affect the filtration effect of the filter cartridge. Utility Model Content

[0006] In view of the shortcomings of the prior art described above, the technical problem to be solved by this utility model is to provide a plate filter element structure and an air filter cleaning system, so as to solve the problem that the existing cylindrical filter element structure cannot simultaneously achieve small space occupation and stable shape.

[0007] To solve the above-mentioned technical problems, this utility model provides a plate-type filter element structure, comprising:

[0008] A filter frame, wherein a receiving groove is provided inside the filter frame;

[0009] The filter element and the adhesive strip attached to the edge of the filter element are provided. The filter element is disposed in the receiving groove, and the edge of the filter element is attached to the inner edge of the corresponding filter frame by the adhesive strip.

[0010] A positioning clip is attached to the filter element and connected to the adhesive strip to shape the filter element.

[0011] As a more preferred approach, the filter frame is provided with a flexible sealing structure on its periphery. The flexible sealing structure fills the installation gap between itself and the installation body, ensuring that within a certain installation gap, the deformation characteristics of the flexible sealing structure are used to adaptively adjust to different installation gaps, thereby improving the installation efficiency of the filter frame and the compactness and sealing of the overall structure.

[0012] As a more preferred method, the filter element is a folding fan structure formed by repeatedly folding filter paper, wherein each fold is parallel to each other and the spacing between two folds is the same.

[0013] As a more preferred embodiment, the folding fan structure includes multiple folding fan protrusions, with the spacing between adjacent folding fan protrusions being 2mm to 10mm.

[0014] As a more preferred method, the positioning clip includes multiple limiting slots that are adapted to the folding fan protrusions, and the folding fan protrusions are engaged in the limiting slots to ensure that the spacing between each folding fan protrusion is uniform.

[0015] As a more preferred approach, the filter frame is provided with a cleaning opening. The cleaning opening allows the filter element surface to be cleaned by blowing from the side of the filter frame. When the filter element is cleaned by blowing through the cleaning opening on the filter frame, the air outlet of the corresponding blowing device does not need to be directly facing the filter frame, but only needs to be set on the side of the filter frame. This can further reduce the size of the entire blowing system and make it more suitable for devices with limited space.

[0016] As a more preferred approach, the filter frame is provided with multiple cleaning openings to meet different cleaning schemes and thus satisfy more usage scenarios.

[0017] As a more preferred embodiment, the folding fan structure includes a strip side and a bent side, wherein the edge of the strip side is a straight line, and the edge of the bent side is a fold line formed by repeated folding, and the folding fan structure is formed by repeatedly folding from the strip side.

[0018] As a more preferred approach, the position of the adhesive strip attached to the edge of the filter element is adjustable. By adjusting the position of the adhesive strip relative to the edge of the bent side, the amount of obstruction on both sides of the folded fan structure is adjusted, thereby distributing the airflow from the cleaning opening to both sides of the filter paper, ensuring the cleaning effect on the side of the filter paper that filters impurities. During use, dust or impurities generally accumulate on one side of the filter element. If the adhesive strip is not used to distribute the airflow, since the entire edge of the bent side is a fold line, when the blowing air blows towards the bent side of the filter element, the blowing air will blow from both sides of the filter element to the filter element surface, and the airflow on both sides is theoretically equal. This will result in a significant cleaning effect on one side, while the cleaning effect on the other side will not meet the requirements. In this application, the adhesive strip is used to obstruct the bent side, and the airflow on both sides is adjusted by adjusting the relative position of the adhesive strip and the edge of the bent side, thereby achieving the adjustment of the cleaning effect.

[0019] To address the aforementioned problems, this utility model also provides an air filter cleaning system, comprising:

[0020] The above-mentioned plate filter element structure;

[0021] The purging device blows the filter element to remove impurities adhering to it, thus ensuring the filter element's filtration effect.

[0022] As described above, the plate filter element structure and air filter cleaning system of this utility model have the following beneficial effects: When in use, the plate filter element structure of this utility model greatly saves its vertical space due to the plate structure, making it possible to use in some narrow spaces; at the same time, the use of positioning clips to assist in positioning the filter element ensures its stability during operation; and the setting of adhesive edge strips ensures the connection and sealing between the filter element and the filter frame.

[0023] The air filter cleaning system of this utility model cleans the filter element by blowing on the filter element on the plate filter element structure, thereby ensuring the filtration capacity of the filter element for a long time.

[0024] In summary, the plate-type filter element structure and air filter cleaning system of this utility model, through the plate-type reinforced filter element structure design and corresponding purging device, take into account the characteristics of low space occupation and stable shape of the filter element, and solve the problem that the existing cylindrical filter element structure cannot take into account both small space occupation and stable shape. Attached Figure Description

[0025] Figure 1 The diagram shown is a structural schematic of the plate filter element structure of this utility model;

[0026] Figure 2 Displayed as Figure 1 A magnified view of a portion of region A in the middle;

[0027] Figure 3 This is a schematic diagram showing the adhesive strip of the plate filter element structure of this utility model located in the middle of the bend side 23 of the filter element.

[0028] Figure 4 This diagram shows the adhesive strip of the plate filter element structure of this utility model located at the lower position of the filter element bending side 23.

[0029] Component designation explanation

[0030] 1. Filter frame

[0031] 11 Flexible sealing structure

[0032] 12 Clean the opening

[0033] 2 Filter Cartridges

[0034] 21. Folding fan protrusion

[0035] 22 strip sides

[0036] 23. Bending side

[0037] 3 Adhesive edge strips

[0038] 4. Positioning Cards Detailed Implementation

[0039] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0040] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed in this utility model. The following detailed description should not be considered restrictive, and the scope of the embodiments of this application is limited only by the claims of the published patents. The terminology used herein is for describing specific embodiments only and is not intended to limit this application. Spatial terms such as "upper," "lower," "left," "right," "below," "below," "lower part," "above," "upper part," etc., may be used in the text to illustrate the relationship between one element or feature shown in the figures and another element or feature.

[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "holding" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of the stated feature, operation, element, component, item, kind, and / or group, but do not preclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition arise only when combinations of elements, functions, or operations are inherently mutually exclusive in some manner.

[0043] like Figure 1 as well as Figure 2 As shown, this utility model provides a plate-type filter element structure, including:

[0044] A filter frame 1, wherein a receiving groove is provided inside the filter frame 1;

[0045] The filter element 2 and the adhesive strip 3 attached to the edge of the filter element 2 are provided in the receiving groove, and the edge of the filter element 2 is attached to the inner edge of the corresponding filter frame 1 through the adhesive strip 3.

[0046] Positioning clip 4 is attached to the filter element 2 and connected to the adhesive strip 3 to shape the filter element 2.

[0047] To better illustrate the plate-type filter element structure of this utility model, the following specific application will be used as an example: When in use, the plate-type filter element structure of this utility model significantly saves vertical space due to its plate structure, making it possible to use in narrow spaces. Simultaneously, the positioning clip 4 is used to assist in positioning the filter element 2, ensuring its stability during operation. Furthermore, the adhesive strip 3 ensures the connection and sealing between the filter element 2 and the filter frame 1.

[0048] In some embodiments of this utility model, such as Figure 1 as well as Figure 2 As shown, the adhesive strip 3 is made of a flexible material, particularly non-woven fabric. Non-woven fabric, with its rapid production speed and low cost, can efficiently meet the needs of large-scale production. It has good air permeability and water permeability, making it particularly suitable as a covering material. At the same time, the softness of non-woven fabric makes it excellent in clothing and household goods. Furthermore, non-woven fabric also possesses antibacterial and chemical corrosion resistance, effectively extending the service life of the plate filter structure.

[0049] In some embodiments of this utility model, such as Figure 1 as well as Figure 2 As shown, a flexible sealing structure 11 is provided on the periphery of the filter frame 1. The flexible sealing structure 11 fills the installation gap between the filter frame 1 and the installation body, ensuring that within a certain installation gap, the deformation characteristics of the flexible sealing structure 11 are used to adaptively adjust to different installation gaps, thereby improving the installation efficiency of the filter frame 1 and the compactness and sealing of the overall structure.

[0050] In some embodiments of this utility model, such as Figure 1 as well as Figure 2 As shown, the filter paper materials include cellulose filter paper, glass fiber filter paper, synthetic fiber filter paper, activated carbon filter paper, microporous membrane filter paper, and quartz fiber filter paper. Cellulose filter paper is low in cost and has moderate filtration efficiency, and is divided into qualitative and quantitative types. The former has low ash content and can withstand temperatures up to 120℃, while the latter has high purity and is suitable for general filtration. Glass fiber filter paper is high-temperature resistant, corrosion resistant, has small pore size, and high filtration accuracy, and is often used for filtering fluids with high particle content. Synthetic fiber filter paper, such as PP, PET, and PTFE, has high strength and good chemical resistance; PTFE also has excellent thermal and chemical stability. Activated carbon filter paper is based on cellulose with added activated carbon, has strong adsorption capacity, and can remove organic matter and odors. Microporous membrane filter paper is made of polymer film with extremely small pores, suitable for filtering microorganisms and viruses. Quartz fiber filter paper has high purity and low ash content, and is suitable for high-precision analysis. These materials each have their own characteristics and are suitable for different filtration needs.

[0051] In some embodiments of this utility model, such as Figure 1 as well as Figure 2 As shown, the filter element 2 is a folding fan structure formed by repeatedly folding filter paper, wherein each fold is parallel to each other and the spacing between two folds is the same.

[0052] In some embodiments of this utility model, such as Figure 1 as well as Figure 2 As shown, the folding fan structure includes multiple folding fan protrusions 21, and the distance between adjacent folding fan protrusions 21 is 2mm to 10mm.

[0053] In some embodiments of this utility model, such as Figure 1 as well as Figure 2 As shown, the plate filter element structure includes multiple positioning clips 4, which are evenly distributed on the filter element 2 to further enhance the shaping capability of the filter element 2; more specifically, in this embodiment, the positioning clips 4 include three in total.

[0054] In some embodiments of this utility model, such as Figure 1 as well as Figure 2 As shown, the positioning clip 4 can be replaced by hot melt adhesive. Hot melt adhesive has a certain structural strength and adhesion, which can not only connect well with the filter element 2 and the adhesive strip 3, but also ensure a certain shaping ability.

[0055] In some embodiments of this utility model, such as Figure 1 as well as Figure 2 As shown, the positioning clip 4 includes multiple limiting slots that are adapted to the folding fan protrusion 21. The folding fan protrusion 21 is inserted into the limiting slots to ensure that the spacing between each folding fan protrusion 21 is uniform.

[0056] In some embodiments of this utility model, such as Figure 1 as well as Figure 2 As shown, a cleaning opening 12 is provided on the upper part of the filter frame 1. The cleaning opening 12 allows the filter element 2 to be cleaned by blowing from the side of the filter frame 1. When the filter element 2 is cleaned by blowing through the cleaning opening 12 on the filter frame 1, the air outlet of the corresponding blowing device does not need to be set directly opposite the filter frame 1, but only needs to be set on the side of the filter frame 1. This can further reduce the volume of the entire blowing system and make it more suitable for devices with limited space.

[0057] As a more preferred approach, the filter frame 1 is provided with multiple cleaning openings 12 to meet different cleaning schemes and thus satisfy more usage scenarios.

[0058] In some possible embodiments of this utility model, the cleaning opening 12 includes two openings, which are arranged on opposite sides of the filter frame 1. In this way, when the purging device performs purging operation on the filter element 2 from opposite sides at the same time, the purging air on both sides can be balanced in the middle of the filter element 2, avoiding the problem that impurities will accumulate on the other side of the filter element 2 due to unilateral purging, thereby achieving a better purging effect. Alternatively, purging openings 12 can be opened on one side or adjacent sides of the filter frame 1 as needed, wherein the length of the purging opening 12 is less than or equal to the length of the filter paper edge on that side.

[0059] As a more preferred embodiment, the folding fan structure includes a strip side 22 and a bent side 23, wherein the edge of the strip side 22 is a straight line, and the edge of the bent side 23 is a fold line formed by repeated folding. The folding fan structure is formed by repeatedly folding from the strip side 22.

[0060] As a more preferred method, the position of the adhesive strip 3 attached to the edge of the filter element 2 is adjustable. By adjusting the position of the adhesive strip 3 and the edge of the bent side 23, the amount of obstruction on both sides of the folded fan structure is adjusted, thereby distributing the airflow from the cleaning opening 12 to both sides of the filter paper. This ensures the cleaning effect on the side of the filter paper that filters impurities. During use, dust or impurities generally accumulate on one side of the filter element 2. If the adhesive strip 3 is not used to distribute the airflow, the entire bent fan structure will be affected. The edge of side 23 is a zigzag line. When the blowing air blows towards the bent side 23, the blowing air will blow from both sides of the filter element 2 to the surface of the filter element 2. Theoretically, the air intake on both sides is equal, which will result in a significant blowing effect on one side, while the blowing effect on the other side is insufficient. In this application, the bent side 23 is blocked by an adhesive strip 3, and the air intake on both sides is adjusted by changing the relative position of the adhesive strip 3 and the edge of the bent side 23, thereby achieving the adjustment of the blowing effect. More specifically, in this embodiment, as Figure 3 As shown, when the adhesive strip 3 is in the middle of the bending side 23, the airflow distribution on both sides of the filter element 2 is consistent when the blowing air blows from the bending side 23 to the filter element 2; when the adhesive strip 3 is placed in the lower position of the bending side 23, the airflow on the lower side of the filter element 2 decreases and the airflow on the upper side increases. This achieves the control of the airflow on both sides of the filter element 2, thereby providing a method and means to control the blowing effect on both sides.

[0061] In some possible embodiments of this utility model, if there is no cleaning opening 12 on one side of the filter frame 1, the corresponding side of the filter paper can be directly connected to this side of the filter frame 1 without the need to set the adhesive strip 3, because there is no need to adjust the air intake on both sides of the filter paper through the adhesive strip 3; this also means that the adhesive strip 3 can also be selected to be pasted on one side, opposite side or multiple sides as needed.

[0062] To address the aforementioned problems, this utility model also provides an air filter cleaning system, comprising:

[0063] The above-mentioned plate filter element structure;

[0064] The purging device blows the filter element 2 to remove impurities attached to it, thus ensuring the filtration effect of the filter element 2.

[0065] To better illustrate the air filter cleaning system of this utility model, the following specific application will be used as an example: The air filter cleaning system of this utility model cleans the filter element 2 by purging the filter element 2 on the plate filter element structure, thereby ensuring the filtration capacity of the filter element 2 for a long time. It can be seen that the plate filter element structure and air filter cleaning system of this utility model, through the plate-type reinforced filter element structure design and the corresponding purging device, take into account the characteristics of low space occupation and stable shape of the filter element 2, and solve the problem that the existing cylindrical filter element structure cannot achieve both small space occupation and stable shape.

[0066] In some possible embodiments of this utility model, the purging device further includes a control unit, a power pack, and compressed air stored in the power pack. The control unit is electrically connected to the power pack and is used to control the opening and closing, interval, and duration of the compressed air release. By controlling the opening and closing interval of the compressed air release, the frequency of a single purging can be adjusted, thereby achieving a suitable frequency according to the current working environment, ensuring the purging effect while reducing losses. By adjusting the duration of a single compressed air release, the effect of a single purging can be adjusted, ensuring the dust removal effect of a single purging. It should also be noted that in this embodiment, the purging is performed at intervals using this pulse effect, which greatly reduces the consumption of compressed air. At the same time, the interval time allows the power pack to compress the compressed air to the target pressure before releasing it, thereby further ensuring the purging effect.

[0067] In summary, the plate filter element structure and air filter cleaning system of this utility model have the following advantages:

[0068] 1. Space saving and improved applicability

[0069] The plate structure greatly saves space in the vertical direction of filter element 2, making it suitable for narrow spaces and expanding the application scenarios of filter element 2.

[0070] 2. Enhanced structural stability

[0071] The positioning clip 4 is used to assist in positioning the filter element 2, which ensures the stability of the filter element 2 during operation and avoids deformation or displacement caused by vibration or fluid impact.

[0072] 3. Optimized sealing performance

[0073] The adhesive strip 3 ensures a tight connection and seal between the filter element 2 and the filter frame 1, preventing unfiltered fluid from bypassing and improving filtration efficiency.

[0074] 4. Material advantages and cost control

[0075] The adhesive edge strip 3 is made of non-woven fabric, which features rapid production, low cost, good air permeability, strong antibacterial and chemical corrosion resistance, and can extend the service life of filter element 2 while meeting the needs of large-scale production.

[0076] 5. Filtration accuracy and versatility

[0077] Filter element 2 uses a variety of filter paper materials such as cellulose filter paper, glass fiber filter paper, and activated carbon filter paper. The appropriate filter paper can be selected according to different filtration needs, meeting a variety of application scenarios from ordinary filtration to high-precision analysis.

[0078] 6. Optimization of folding fan structure

[0079] The filter element 2 adopts a folding fan structure with uniform fold spacing, which can increase the filtration area. At the same time, the positioning clip 4 and the limiting slot ensure that the spacing of the folding fan protrusions 21 is uniform, further improving filtration efficiency and structural stability.

[0080] 7. Cleaning function and system optimization

[0081] The filter frame 1 is equipped with a cleaning opening 12, allowing the filter element 2 to be blown from the side. This eliminates the need for a direct facing cleaning device, reducing the size of the cleaning system and making it suitable for equipment with limited space. Simultaneously, pulse cleaning via the control unit and compressed air efficiently removes impurities, reduces compressed air consumption, and extends the service life of the filter element 2.

[0082] 8. Flexibility and adjustability

[0083] The position of the adhesive strip 3 is adjustable, allowing for adjustments to the airflow distribution on both sides of the filter paper as needed, thus optimizing the purging effect. Furthermore, the number and position of the cleaning openings 12 can be flexibly set according to actual requirements.

[0084] 9. Overall system optimization

[0085] An air filter cleaning system is provided, which combines a plate filter element structure and a purging device to solve the problems of large space occupation and unstable shape of existing cylindrical filter elements, and achieves a balance between low space occupation and stable shape.

[0086] This invention significantly improves the space utilization, structural stability, sealing performance, and filtration accuracy of filter element 2 by optimizing the filter element structure and employing plate design, positioning clips 4, adhesive edge strips 3, various filter paper materials, and a folding fan structure. Simultaneously, the inclusion of a cleaning opening 12 and a purging device enables efficient cleaning of filter element 2, extending its service life. Overall, the plate filter element structure and air filter cleaning system of this invention outperform existing technologies in terms of space occupation, morphological stability, filtration effect, and service life, demonstrating significant innovation and practicality, and is suitable for various filtration scenarios. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and possesses high industrial application value.

[0087] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A plate filter cartridge construction, characterized by The utility model relates to a filter frame structure, including: A filter frame (1) is provided with a containing groove in the filter frame (1); A filter core (2) and a sticky edge strip (3) pasted to the edge of the filter core (2) are arranged in the containing groove, and the edge of the filter core (2) is pasted to the inner edge of the corresponding filter frame (1) through the sticky edge strip (3); A positioning clamp (4) is arranged on the filter core (2) and connected with the sticky edge strip (3) to shape the filter core (2).

2. The plate and frame filter cartridge construction of claim 1 wherein: The filter frame (1) is provided with a flexible sealing structure (11) on the periphery to fill the installation gap between the filter frame (1) and the installation body.

3. The plate and frame filter cartridge construction of claim 1 wherein: The filter core (2) is a folding fan structure formed by repeatedly folding filter paper.

4. The plate and frame filter cartridge construction of claim 3 wherein: The folding fan structure includes a plurality of folding fan protrusions (21), and the spacing between adjacent folding fan protrusions (21) is 2mm-10mm.

5. The plate and frame filter cartridge construction of claim 4 wherein: The positioning clamp (4) includes a plurality of limiting clamping grooves matched with the folding fan protrusions (21), and the folding fan protrusions (21) are clamped into the limiting clamping grooves to ensure that the spacing between the folding fan protrusions (21) is uniform.

6. The plate and frame filter cartridge construction of claim 1 wherein: The filter frame (1) is provided with a cleaning opening (12) on the upper side, and the cleaning opening (12) satisfies the blowing and cleaning of the surface of the filter core (2) from the side of the filter frame (1).

7. The plate and frame filter cartridge construction of claim 6 wherein: The filter frame (1) is provided with a plurality of cleaning openings (12).

8. The plate and frame filter cartridge construction of claim 3 wherein: The folding fan structure includes a strip-shaped side (22) and a bent side (23), wherein the edge of the strip-shaped side (22) is a straight line, and the edge of the bent side (23) is a fold line formed by repeatedly folding.

9. The plate and frame filter cartridge construction of claim 8 wherein: The position of the sticky edge strip (3) connected to the edge of the filter core (2) can be adjusted, the amount of shielding of both sides of the folding fan structure is adjusted by adjusting the position of the sticky edge strip (3) and the edge of the bent side (23), and then the distribution of the air inlet amount blown from the cleaning opening (12) to both sides of the filter paper is realized.

10. An air filter cleaning system characterized by, The utility model relates to a filter frame structure, including: The plate filter core structure of any one of claims 1-9; A blowing device is arranged to blow the filter core (2) to remove impurities attached to the filter core (2) and ensure the filtering effect of the filter core (2).

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