Filter structure for ventilators

Abstract

This invention provides a ventilator edge-sealed filter structure, including filter screens, an intermediate mesh, and fasteners. Two filter screens are provided, arranged parallel and spaced apart. The intermediate mesh is positioned between the two filter screens, with its two mesh surfaces contacting the two filter screens respectively, forming a stacked assembly. The intermediate mesh has a central hole. Fasteners are ring-shaped around the outer edges of each filter screen and the intermediate mesh, securing the assembly formed by the filter screens and the intermediate mesh. The ventilator edge-sealed filter structure provided by this invention effectively reduces airflow resistance while maintaining overall structural strength and effective interception, exhibiting strong adaptability and practicality.

Description

Technical Field

[0001] This utility model belongs to the field of filter structure technology, specifically relating to a rimmed filter structure for a ventilator. Background Technology

[0002] The filter in a ventilator is a crucial safety component, its main function being to filter and purify the incoming air.

[0003] In existing technologies, the use of filter structures (or filter meshes) in ventilators requires high standards. Firstly, they must not create excessive airflow resistance, necessitating good permeability. Secondly, the filter structure must effectively intercept airflow, requiring small mesh pore sizes. Furthermore, the filter structure must possess sufficient structural strength, typically achieved through multiple layers of spirally stacked wire mesh to ensure stability under ventilator operating pressure and airflow impact. However, a larger mesh size inevitably increases airflow resistance and the impact on the filter structure; conversely, a smaller mesh size cannot guarantee effective gas filtration. Additionally, ensuring sufficient structural strength involves multiple layers of wire mesh, which further increases airflow resistance. Therefore, a filter structure is urgently needed that can reduce airflow resistance while effectively intercepting airflow and maintaining structural strength. Utility Model Content

[0004] This utility model provides a ventilator edge-sealed filter structure, which aims to solve the adaptability problem caused by the inability of existing ventilator filter structures to simultaneously reduce airflow resistance, effectively intercept airflow, and ensure structural strength.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a ventilator edge-sealed filter structure, comprising:

[0006] The filter screen is provided in two, and the two filter screens are arranged in parallel and spaced apart.

[0007] An intermediate mesh is disposed between the two filter meshes and in contact with both filter meshes; the intermediate mesh has a central hole.

[0008] Fasteners are arranged around the outer edges of each of the filter screens and the intermediate screen to fix each of the filter screens and the intermediate screen.

[0009] In one possible implementation, each of the filter screens is circular; the intermediate screen is annular and coaxially arranged with each of the filter screens.

[0010] In one possible implementation, the fastener includes:

[0011] An upper gasket has an upper circular hole coaxially arranged with the central hole; the upper gasket is pressed onto one of the filter screens.

[0012] The lower pad has a lower circular hole coaxially arranged with the central hole; the lower pad is pressed onto another filter screen; the outer edge of the lower pad has an annular edging that can extend toward the upper pad and wrap around the outer edge of the upper pad;

[0013] The lower pad and the upper pad, when combined, together clamp and fix the assembly of each filter screen and the intermediate screen.

[0014] In one possible implementation, the upper circular hole and the lower circular hole have the same diameter, and both are larger than the diameter of the central hole.

[0015] In one possible implementation, the outer surface of the upper pad away from the lower pad is designated as the first plate surface, and an annular inclined surface adapted to the annular edging is provided at the outer edge of the first plate surface.

[0016] In one possible implementation, the mesh count of each of the filter screens and the intermediate screens is equal.

[0017] In this implementation, the stacked two filter sheets and the intermediate mesh form a composite structure with sufficient thickness. This thickness, combined with fasteners, ensures structural strength and effectively withstands the working pressure and airflow impact of the ventilator. The intermediate mesh has a central hole, which enhances the local permeability of the composite structure, reducing airflow resistance while effectively intercepting airflow, thus ensuring patient breathing comfort. Therefore, this implementation, by securing the two filter sheets and the intermediate mesh between them with fasteners, effectively reduces airflow resistance while maintaining overall structural strength and effective interception. It is highly adaptable and practical. Attached Figure Description

[0018] Figure 1 An exploded view of the edge-sealed filter structure for a ventilator provided in an embodiment of this utility model;

[0019] Figure 2 This is a cross-sectional view of the edge-sealed filter structure for a ventilator provided in an embodiment of the present invention;

[0020] Figure 3 for Figure 2 An enlarged structural diagram of section A of the edge-sealed filter structure for a ventilator provided in the embodiment;

[0021] Explanation of reference numerals in the attached figures:

[0022] 10. Filter screen; 20. Middle screen; 21. Center hole; 30. Fastener; 31. Upper gasket; 311. Annular bevel; 312. Upper round hole; 32. Lower gasket; 321. Lower round hole; 322. Annular edging. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] Please refer to the following: Figure 1 and Figure 2 The ventilator edge-sealing filter structure provided by this utility model will now be described. The ventilator edge-sealing filter structure includes filter mesh 10, intermediate mesh 20, and fasteners 30. Two filter meshes 10 are provided, arranged parallel and spaced apart. The intermediate mesh 20 is disposed between the two filter meshes 10, with its two mesh surfaces respectively contacting the two filter meshes 10 to form a stacked assembly. The intermediate mesh 20 has a central hole 21. The fasteners 30 are circumferentially disposed at the outer edges of each filter mesh 10 and the intermediate mesh 20, and can fix the assembly formed by the filter meshes 10 and the intermediate mesh 20.

[0025] The working principle of the ventilator edge-sealed filter structure provided in this embodiment is that during the airflow process, most of the gas flows through the area corresponding to the central hole 21 on the middle mesh 20, and a small part of the gas flows through the area around the central hole 21.

[0026] The ventilator edge-sealed filter structure provided in this embodiment, compared with the prior art, uses two stacked filter meshes 10 and an intermediate mesh 20 to form a composite with a certain thickness. This thickness, combined with the fastener 30, ensures structural strength and effectively withstands the working pressure and airflow impact of the ventilator. The intermediate mesh 20 has a central hole 21, which enhances the local permeability of the composite, reducing airflow resistance while effectively intercepting airflow, thus ensuring patient breathing comfort. Therefore, this embodiment, by fixing the two filter meshes 10 and the intermediate mesh 20 between them using fasteners 30, effectively reduces airflow resistance while maintaining overall structural strength and effective interception, demonstrating strong adaptability and practicality.

[0027] In some embodiments, the filter screen 10 and the intermediate screen 20 may be adopted as follows: Figure 1 The structure shown. See also Figure 1Each filter screen 10 is circular. The middle screen 20 is annular and is coaxially arranged with each filter screen 10.

[0028] The circular filter screen 10 and the circular intermediate screen 20 are easy to manufacture and can be adapted to the structure of the ventilator. The circular filter screen 10 and the intermediate screen 20 have a uniform structure, good stress resistance, are not easily deformed, and their edges are continuous smooth curves, making them easier to fix or seal.

[0029] It should be noted that the filter 10 and the intermediate mesh 20 can also be made into square or other shapes according to the needs of different ventilators. The specific fasteners 30 need to be adjusted according to the shape of the filter 10 and the intermediate mesh 20.

[0030] In some embodiments, the fastener 30 described above may be as follows: Figures 1 to 3 The structure shown. See also Figures 1 to 3 The fastener 30 includes an upper washer 31 and a lower washer 32. The upper washer 31 has an upper circular hole 312 coaxially arranged with the central hole 21. The upper washer 31 is pressed onto one of the filter screens 10. The lower washer 32 has a lower circular hole 321 coaxially arranged with the central hole 21. The lower washer 32 is pressed onto the other filter screen 10. The outer edge of the lower washer 32 has an annular edging 322 that extends towards the upper washer 31 and wraps around the outer edge of the upper washer 31.

[0031] The stacked assembly of the filter screens 10 and the intermediate screen 20 has the exposed surfaces of the two filter screens 10 furthest from the intermediate screen 20. The upper gasket 31 and the lower gasket 32 ​​abut against these two surfaces, thus clamping the assembly and securing it. Both the upper and lower gaskets 31 and 32 have circular holes, and the areas corresponding to these holes are the airflow passages, ensuring gas filtration.

[0032] The lower gasket 32 ​​wraps around the outer edge of the upper gasket 31 via its annular edging 322, thereby limiting and locking the upper gasket 31. Simultaneously, it pulls the upper gasket 31 closer to the lower gasket 32, ensuring that the upper and lower gaskets 31 together clamp and fix the stacked assembly of the filter screens 10 and the intermediate screen 20. The annular edging 322 has a simple structure and can seal the outer edge of the stacked assembly of the filter screens 10 and the intermediate screen 20, thus ensuring the overall filtration effect and further guaranteeing the overall structural strength.

[0033] It should be noted that when the filter screen 10 and the middle screen 20 are circular, the outer edge of the lower pad 32 can be formed into an annular edging 322 by spinning technology and directly wrapping around the outer edge of the upper pad 31.

[0034] In some embodiments, the upper gasket 31 and the lower gasket 32 ​​may be adopted as follows: Figure 1 and Figure 3 The structure shown. See also Figure 1 and Figure 3 The upper circular hole 312 and the lower circular hole 321 have the same diameter, and both are larger than the diameter of the central hole 21.

[0035] This structure increases the air permeable area, so that during actual operation, most of the gas flows through the area corresponding to the central hole 21 on the middle mesh 20, and a small portion of the gas flows through the area around the central hole 21, reducing airflow resistance while ensuring effective interception.

[0036] In some embodiments, the upper gasket 31 may be as follows: Figure 3 The structure shown. See also Figure 3 The outer surface of the upper gasket 31 away from the lower gasket 32 ​​is set as the first plate surface, and an annular inclined surface 311 adapted to the annular edging 322 is provided at the outer edge of the first plate surface.

[0037] When the annular edging 322 wraps around the upper gasket 31 in a conventional manner, it forms an annular protrusion on the first plate surface. This annular protrusion inevitably occupies space along the overall axial direction and is aesthetically unappealing. However, the annular bevel 311 located on the outer edge of the upper gasket 31 can accommodate and fit the annular edging 322, thus avoiding the occupation of additional space while maintaining aesthetics. Furthermore, the annular bevel 311 also increases the contact area with the annular edging 322, thereby ensuring a better clamping effect and ultimately guaranteeing structural strength.

[0038] In some embodiments, the filter screen 10 and the intermediate screen 20 may be adopted as follows: Figure 1 The structure shown. See also Figure 1 Each filter screen 10 and the intermediate screen 20 has the same mesh count, meaning the number of mesh openings per unit area is equal. This structure allows both the filter screen 10 and the intermediate screen 20 to be made of the same wire mesh, which can reduce costs while ensuring the interception effect of bacteria, impurities, etc. in the gas.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bound filter structure for a breathing apparatus, characterized in that include: The filter screen is provided in two, and the two filter screens are arranged in parallel and spaced apart. An intermediate mesh is disposed between the two filter meshes and in contact with both filter meshes; the intermediate mesh has a central hole. Fasteners are arranged around the outer edges of each of the filter screens and the intermediate screen to fix each of the filter screens and the intermediate screen.

2. The edge-sealed filter structure for a ventilator as described in claim 1, characterized in that, Each of the filter screens is circular; the intermediate screen is annular and is coaxially arranged with each of the filter screens.

3. The ventilator edge-sealed filter structure as described in any one of claims 1-2, characterized in that, The fasteners include: An upper gasket has an upper circular hole coaxially arranged with the central hole; the upper gasket is pressed onto one of the filter screens. The lower pad has a lower circular hole coaxially arranged with the central hole; the lower pad is pressed onto another filter screen; the outer edge of the lower pad has an annular edging that can extend toward the upper pad and wrap around the outer edge of the upper pad.

4. The edge-sealed filter structure for a ventilator as described in claim 3, characterized in that, The upper circular hole and the lower circular hole have the same diameter, and both are larger than the diameter of the central hole.

5. The edge-sealed filter structure for a ventilator as described in claim 3, characterized in that, The outer surface of the upper pad away from the lower pad is defined as the first plate surface, and an annular inclined surface adapted to the annular edging is provided at the outer edge of the first plate surface.

6. The edge-sealed filter structure for a ventilator as described in claim 1, characterized in that, The mesh count of each filter screen and the intermediate screen is equal.

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