filter box

Abstract

The utility model provides a filter box. In one embodiment, a filter box (1) is provided, comprising: a box body (10) having an air inlet (11); and a pre-filtering cotton layer (90) arranged at the air inlet (11) and enclosing the air inlet (11); wherein the effective filtering area of the pre-filtering cotton layer (90) is at least 5% greater than the area of the air inlet (11).

Description

Technical Field

[0001] This utility model relates to the field of protective equipment technology, and in particular to a filter cartridge. Background Technology

[0002] In work environments with solid or liquid particulate matter such as dust and gaseous pollutants such as organic vapors (e.g., grinding, welding), respiratory protective equipment (such as gas masks) is typically required. The filter cartridge is one of the core components of respiratory protective equipment (such as gas masks), and its main function is to filter and adsorb specific toxic gases and vapors in the inhaled air, protecting the wearer from harmful chemicals.

[0003] Air filter cartridges typically have a pre-filter layer at the air inlet. The main function of this pre-filter layer is to filter solid or liquid particulate matter such as dust and aerosols, protecting the filter element in the air filter cartridge from contamination or clogging by these particles, thereby extending the service life of the air filter cartridge and ensuring its effectiveness in protecting against gaseous pollutants.

[0004] In existing filter cartridges, the pre-filter layer is positioned at the front of the cartridge's air inlet and is designed to cover the inlet, having a flat, planar structure that matches the inlet's surface area. This existing design limits the filtration area of ​​the pre-filter layer to the area of ​​the air inlet. In practice, the concentrated airflow through this limited area results in excessive airflow per unit area, leading to high breathing resistance. This resistance increases significantly, especially after the filter layer has absorbed a large amount of particulate matter, impacting user comfort. Furthermore, due to the limited filtration area, the pre-filter layer quickly becomes saturated with solid or liquid particles, resulting in a short lifespan for the pre-filter layer and even the entire filter cartridge, requiring frequent replacement. Utility Model Content

[0005] The purpose of this utility model is to solve at least one aspect of the aforementioned problems and defects existing in the prior art.

[0006] According to one aspect of the present invention, a filter cartridge is provided, comprising: a cartridge body having an air inlet; and a pre-filter cotton layer, the pre-filter cotton layer being disposed at the air inlet and sealing the air inlet; wherein the effective filtration area of ​​the pre-filter cotton layer is at least 5% larger than the area of ​​the air inlet.

[0007] According to some exemplary embodiments of the present invention, the pre-filter cotton layer protrudes from the air inlet toward the outside of the box body.

[0008] In an exemplary embodiment of the present invention, the pre-filter cotton layer presents a dome shape that protrudes from the air inlet toward the outside of the box.

[0009] According to some exemplary embodiments of the present invention, the height of the dome shape is within a range that is greater than zero and less than or equal to the radius of the air inlet.

[0010] In an exemplary embodiment of the present invention, the air inlet is circular, and the pre-filter cotton layer has a hemispherical dome shape.

[0011] According to some exemplary embodiments of the present invention, the filter cartridge may further include a support member disposed between the cartridge body and the pre-filter cotton layer to support the dome shape of the pre-filter cotton layer.

[0012] According to some exemplary embodiments of the present invention, the box body has a peripheral portion defining the air inlet, and the pre-filter cotton layer is bonded to the peripheral portion by ultrasonic welding or hot pressing.

[0013] According to some exemplary embodiments of the present invention, the filter cartridge may further include a retainer that is detachably press-fitted onto the peripheral portion of the cartridge body to maintain the bond between the pre-filter cotton layer and the peripheral portion.

[0014] According to some exemplary embodiments of the present invention, the pre-filter cotton layer adopts a multi-layer non-woven fabric structure.

[0015] According to some exemplary embodiments of the present invention, the filter cartridge further includes a filter element, which is arranged in the cartridge body.

[0016] The filter cartridges provided according to the foregoing embodiments of this utility model, by increasing the effective filtration area of ​​the pre-filter cotton layer, reduce the airflow resistance per unit area, effectively reducing breathing resistance while maintaining the required level of protection, thereby improving the user comfort of respiratory protective equipment. Furthermore, by increasing the effective filtration area of ​​the pre-filter cotton layer, the particulate load is dispersed, effectively extending the service life of the pre-filter cotton layer and even the entire filter cartridge.

[0017] Other objects and advantages of the present invention will become apparent from the following description of the invention with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the invention. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram showing a filter cartridge according to an exemplary embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram showing the front view of the filter cartridge according to an exemplary embodiment of the present invention;

[0020] Figure 3 It is along Figure 2 A schematic diagram of the cross-sectional structure cut along line AA;

[0021] Figure 4 This is a bottom view schematic diagram showing the filter cartridge according to an exemplary embodiment of the present invention;

[0022] Figure 5 This is a top view schematic diagram showing the filter cartridge according to an exemplary embodiment of the present invention;

[0023] Figure 6 This is a three-dimensional structural schematic diagram showing the pre-filter cotton layer in a filter cartridge according to an exemplary embodiment of the present invention;

[0024] Figure 7 This is a three-dimensional structural diagram showing the cartridge body in a filter cartridge according to an exemplary embodiment of the present invention. Detailed Implementation

[0025] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings. In this specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of this utility model with reference to the accompanying drawings is intended to explain the overall inventive concept of this utility model and should not be construed as a limitation thereof.

[0026] Furthermore, in the following detailed description, numerous specific details are set forth for ease of explanation to provide a thorough understanding of the embodiments disclosed herein. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and apparatuses are illustrated to simplify the figures.

[0027] Figures 1 to 5 These are schematic diagrams showing the structure of the filter cartridge according to an exemplary embodiment of the present invention from different perspectives. Figure 6 This is a three-dimensional structural schematic diagram showing the pre-filter cotton layer in a filter cartridge according to an exemplary embodiment of the present invention. Figure 7 This is a three-dimensional structural diagram showing the cartridge body in a filter cartridge according to an exemplary embodiment of the present invention.

[0028] See Figures 1 to 7According to an exemplary embodiment of the present invention, a filter cartridge 1 is provided, mainly used in respiratory protective equipment (such as gas masks). The filter cartridge 1 includes at least a cartridge body 10 and a pre-filter cotton layer 90. The cartridge body 10 has an air inlet 11. The pre-filter cotton layer 90 is disposed at the air inlet 11 of the cartridge body 10 and airtightly seals the air inlet 11. According to the present invention, the effective filtration area of ​​the pre-filter cotton layer 90 is larger than the area of ​​the air inlet 11; specifically, the pre-filter cotton layer 90 is designed such that its effective filtration area is at least about 5% larger than the area of ​​the air inlet 11. It should be noted that the "effective filtration area" described herein refers to the area through which gas can pass. For example, the edge portion of the pre-filter cotton layer 90 used to connect with the periphery of the air inlet 11 is not considered part of the effective filtration area. Furthermore, considering manufacturing errors during the production of the pre-filter cotton layer, the effective filtration area of ​​the pre-filter cotton layer 90 is designed to be at least about 5% larger than the area of ​​the air inlet 11. According to this invention, the pre-filter cotton layer 90 can be designed to protrude from the air inlet 11 toward the outside of the housing 10. According to this invention, by designing the effective filtration area of ​​the pre-filter cotton layer 90 to be larger than the area of ​​the air inlet 11, and by making the pre-filter cotton layer 90 protrude from the air inlet 11 toward the outside of the housing 10, the effective filtration area of ​​the pre-filter cotton layer can be effectively increased. For example, the area of ​​the air inlet 11 in the housing 10 is approximately 50 cm². 2 In this case, the pre-filter cotton layer 90 can achieve a filtration area of ​​approximately 70 cm². 2 Approximately 80cm 2 Within the range. Therefore, compared to the flat structure of existing pre-filter cotton layers, the effective filtration area of ​​the pre-filter cotton layer 90 provided by this utility model is increased by at least about 40% or even about 60%, thus effectively reducing breathing resistance while maintaining the required level of protection, thereby improving the user comfort of respiratory protective equipment.

[0029] According to an exemplary embodiment of the present invention, such as Figures 1 to 7 As shown, the pre-filter layer 90 can be designed to present a dome shape, bulging outward from the air inlet 11 toward the exterior of the housing 10. See also, for example... Figure 3 In the exemplary embodiment illustrated, the height H of the dome shape is within a range greater than zero and less than or equal to the radius of the air inlet 11. The inventors discovered through airflow simulation experiments that by employing a dome shape with the aforementioned height H, the effective filtration area of ​​the pre-filter layer can be increased while simultaneously improving the uniformity of airflow distribution, thereby effectively reducing breathing resistance. However, it should be noted that in other embodiments, the pre-filter layer 90 can also be designed to present other shapes that protrude from the air inlet 11 towards the outside of the housing 10, as long as the effective filtration area of ​​the pre-filter layer can be increased.

[0030] According to this invention, the pre-filter cotton layer 90 can adopt a flexible multi-layer nonwoven fabric structure. In the illustrated exemplary embodiment, the pre-filter cotton layer 90 adopts a three-layer nonwoven fabric structure, specifically including an outer woven nonwoven fabric layer, a middle meltblown nonwoven fabric layer, and an inner thermoplastic nonwoven fabric layer. These nonwoven fabric layers can be laminated to form the pre-filter cotton layer 90. However, it should be noted that the aforementioned three-layer nonwoven fabric structure of the pre-filter cotton layer 90 is merely exemplary, and the number and / or material and / or manufacturing method of the nonwoven fabric layers of the pre-filter cotton layer 90 can be adjusted according to actual needs, and this invention does not limit this. Furthermore, according to actual needs, the pre-filter cotton layer 90 can be coated with a coating, for example, a coating used to identify the model and / or number of nonwoven fabric layers and / or material and / or manufacturing method of the pre-filter cotton layer.

[0031] According to this utility model, such as Figures 1 to 7 As shown in the illustrated exemplary embodiment, the cartridge 1's housing 10 can be made of rigid plastic and has a generally cylindrical shape. An air inlet 11 is provided on one side of the housing 10, and an air outlet (not shown) is provided on the side opposite to the aforementioned side. The cartridge 1 also includes a filter element (not shown) disposed within the housing 10, which is used to filter and adsorb specific toxic gases and vapors in the inhaled air. For example, the filter element can be made of a material with high adsorption capacity for gaseous and vaporous pollutants, such as activated carbon. Furthermore, the cartridge 1 may also include a mesh-like retaining member (not shown) disposed at the air inlet 11 of the housing 10 to effectively retain the filter element inside the housing 10.

[0032] like Figures 1 to 7 As shown, in the illustrated exemplary embodiment, the air inlet 11 of the housing 10 is circular, and the housing 10 has a peripheral portion 12 defining the air inlet 11 (e.g., Figure 7 (As shown). The pre-filter cotton layer 90 has an easily processable hemispherical dome shape and includes a main body portion 91 with an effective filtration area and an edge portion 92 for attachment to the housing 10, as shown. Figure 6 As shown. Specifically, in the exemplary embodiment illustrated, see... Figure 3 The pre-filter cotton layer 90 is bonded to the periphery 12 of the box body 10 by ultrasonic welding or hot pressing (e.g., Figure 7 As shown), more specifically, the edge portion 92 of the pre-filter cotton layer 90 (as shown) Figure 6(As shown) The pre-filter cotton layer 90 is bonded to the peripheral portion 12 of the box body 10 by ultrasonic welding or hot pressing. However, it should be noted that the bonding method between the pre-filter cotton layer 90 and the box body 10 is not limited to the above-mentioned ultrasonic welding or hot pressing method. As long as the pre-filter cotton layer 90 and the box body 10 can be effectively bonded into one piece, this utility model does not impose any limitation on this. In addition, according to this utility model, in some other embodiments, the pre-filter cotton layer 90 can also be designed to be detachably and airtightly bonded to the box body 10.

[0033] Furthermore, such as Figures 1 to 5 As shown, according to this utility model, the filter cartridge 1 may further include a retaining member 40. For example... Figure 3 As shown, in the illustrated exemplary embodiment, the retainer 40 is detachably press-fitted onto the peripheral portion 12 of the housing 10 to protect the pre-filter cotton layer 90 (specifically, as shown in the figure). Figure 6 The shown edge portion 92) and the peripheral portion 12 are joined together. In the illustrated exemplary embodiment, the retainer 40 has an annular structure and is detachably press-fitted to the peripheral portion 12 of the housing 10 by a snap-fit ​​mechanism. However, it should be noted that in other embodiments, the retainer 40 may have other shapes or be detachably joined to the housing 10 in other ways, as long as protection is achieved at the joint between the pre-filter cotton layer 90 and the housing 10. Furthermore, according to this invention, since the retainer 40 is detachably joined to the housing 10, the retainer 40 can be reused, thereby reducing the cost of the filter cartridge.

[0034] Furthermore, since the pre-filter cotton layer 90, which employs a multi-layer non-woven fabric structure, is flexible, it may experience localized collapse or deformation due to insufficient rigidity during use. Therefore, the filter cartridge 1 provided by this invention may further include a support member (not shown). The support member can have a shape that matches the shape of the pre-filter cotton layer 90 to support and maintain the shape of the pre-filter cotton layer 90 from deformation. Specifically, the support member can be made of thermoplastic fiber material (PET / PP), employing a simple structure (e.g., plastic mesh / mesh fabric) that does not impede gas flow, and is positioned between the cartridge body 10 and the pre-filter cotton layer 90 to support and maintain the dome shape of the pre-filter cotton layer 90 from deformation.

[0035] Although the present invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to illustrate preferred embodiments of the present invention and should not be construed as a limitation thereof.

[0036] While some embodiments of the present invention have been shown and described, those skilled in the art will understand that changes may be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A filter cartridge (1), comprising: A box (10) with an air inlet (11); and A pre-filter cotton layer (90) is disposed at the air inlet (11) and closes the air inlet (11). Its features are, The effective filtration area of ​​the pre-filter cotton layer (90) is at least 5% larger than the area of ​​the air inlet (11).

2. The filter cartridge (1) according to claim 1, characterized in that, The pre-filter cotton layer (90) protrudes from the air inlet (11) toward the outside of the box (10).

3. The filter cartridge (1) according to claim 2, characterized in that, The pre-filter cotton layer (90) has a dome shape that protrudes from the air inlet (11) toward the outside of the box (10).

4. The filter cartridge (1) according to claim 3, characterized in that, The height (H) of the dome shape is within a range that is greater than zero and less than or equal to the radius of the air inlet (11).

5. The filter cartridge (1) according to claim 3, characterized in that, The air inlet (11) is circular, and the pre-filter cotton layer (90) has a hemispherical dome shape.

6. The filter cartridge (1) according to claim 3, characterized in that, The filter cartridge (1) also includes a support member disposed between the cartridge body (10) and the pre-filter cotton layer (90) to support the dome shape of the pre-filter cotton layer (90).

7. The filter cartridge (1) according to any one of claims 1 to 6, characterized in that, The box body (10) has a peripheral portion (12) defining the air inlet (11), and the pre-filter cotton layer (90) is bonded to the peripheral portion (12) by ultrasonic welding or hot pressing.

8. The filter cartridge (1) according to claim 7, characterized in that, The filter cartridge (1) also includes a retainer (40) which is removably press-fitted into the peripheral portion (12) of the cartridge body (10) to protect the bond between the pre-filter layer (90) and the peripheral portion (12).

9. The filter cartridge (1) according to any one of claims 1 to 6, characterized in that, The pre-filter cotton layer (90) adopts a multi-layer non-woven fabric structure.

10. The filter cartridge (1) according to any one of claims 1 to 6, characterized in that, The filter cartridge (1) also includes a filter element, which is arranged in the cartridge body (10).

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