A filter canister with a uniform airflow distribution plate structure

Abstract

This invention proposes a filter canister with a uniform airflow distribution plate structure. The filter canister is a cylindrical axial flow structure with a cylindrical canister body. The catalyst is filled inside the canister body. A mesh plate is fixed to the inner wall of the canister body and compresses the catalyst from below. The canister bottom is fixed to the bottom of the canister body, and the air distribution plate is fixed at the central hole of the canister bottom. The filter layer is fixed on the canister bottom and located between the canister bottom and the lower surface of the mesh plate. The air distribution plate is a circular perforated plate structure with a series of circular holes of different diameters evenly distributed in a ring from the inside to the outside. The filter canister of this invention uses an air distribution plate with a central circular perforated plate structure that has low occlusion rate and high utilization rate of filter paper and catalyst. This reduces occlusion of filter paper and catalyst, improves the utilization rate of filter paper and catalyst, reduces the air resistance of the filter canister, and optimizes the design of a filter canister structure with low air resistance and high bed utilization rate.

Description

Technical Field

[0001] This utility model belongs to the field of chemical protection technology, specifically relating to a filter canister with a uniform airflow distribution plate structure for use in gas masks. Background Technology

[0002] Currently, the air distribution plate of gas mask filter canisters both domestically and internationally consists of a circular plate without openings connected to horizontal ribs in the middle. This structure forces the airflow to diffuse in all directions, obstructing the filter paper and catalyst in the middle part and reducing the utilization rate of the filter paper and catalyst. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] This invention proposes a filter canister with a uniform airflow distribution plate structure to solve the technical problem of how to improve the utilization rate of filter paper and catalyst.

[0005] (II) Technical Solution

[0006] To address the aforementioned technical problems, this utility model proposes a filter canister with a uniform airflow distribution plate structure. The filter canister includes a canister body, a catalyst, a mesh plate, a smoke filter layer, a canister bottom, and a distribution plate. The filter canister is an overall cylindrical axial flow structure, with the canister body being cylindrical and the catalyst filled inside. The mesh plate is fixed to the inner wall of the canister body and compresses the catalyst from below. The canister bottom is fixed to the bottom of the canister body, the distribution plate is fixed at the central hole of the canister bottom, and the smoke filter layer is fixed to the canister bottom and located between the canister bottom and the lower surface of the mesh plate. The distribution plate is a circular perforated plate structure, with a series of circular holes of varying diameters evenly distributed in a ring from the inside out.

[0007] Furthermore, the catalyst is packed inside the tank in a layered manner.

[0008] Furthermore, the mesh plate is fixed to the inner wall of the tank by ultrasonic welding.

[0009] Furthermore, both the upper and lower surfaces of the catalyst have a planar structure.

[0010] Furthermore, non-woven fabric is laid on the upper and lower surfaces of the catalyst.

[0011] Furthermore, the bottom of the tank is fixed to the bottom of the tank body by ultrasonic welding.

[0012] Furthermore, the gas distribution plate is welded to the center hole at the bottom of the tank.

[0013] Furthermore, the smoke filter layer is fixed to the bottom of the tank with an adhesive.

[0014] Furthermore, the gas distribution plate is a circular perforated plate structure, and the circular perforated plate is fixed to the reinforcing ribs at the bottom of the tank by ultrasonic welding.

[0015] Furthermore, both the top and bottom surfaces of the circular perforated plate are planar structures.

[0016] (III) Beneficial Effects

[0017] This invention proposes a filter canister with a uniform airflow distribution plate structure. The filter canister is a cylindrical axial flow structure with a cylindrical canister body. The catalyst is filled inside the canister body. A mesh plate is fixed to the inner wall of the canister body and compresses the catalyst from below. The canister bottom is fixed to the bottom of the canister body, and the air distribution plate is fixed at the central hole of the canister bottom. The filter layer is fixed on the canister bottom and located between the canister bottom and the lower surface of the mesh plate. The air distribution plate is a circular perforated plate structure with a series of circular holes of different diameters evenly distributed in a ring from the inside to the outside. The filter canister of this invention uses an air distribution plate with a central circular perforated plate structure that has low occlusion rate and high utilization rate of filter paper and catalyst. This reduces occlusion of filter paper and catalyst, improves the utilization rate of filter paper and catalyst, reduces the air resistance of the filter canister, and optimizes the design of a filter canister structure with low air resistance and high bed utilization rate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the filter canister structure of this utility model;

[0019] Figure 2 This is an axial view of the filter canister structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the air distribution plate structure in this utility model;

[0021] Figure 4 The graph shows the residence time distribution curves at h=15mm in the adsorption layer for both the filter canister with and without perforations on the gas distribution plate. In the graph: The residence time distribution curve at h=15mm in the adsorption layer when the gas distribution plate of the filter canister has no openings; The curve shows the residence time distribution at h=15mm in the adsorption layer when the gas distribution plate of the filter canister is perforated; the vertical axis represents the residence time in seconds (s); the horizontal axis represents the dimensionless radius of the adsorption layer in the filter canister.

[0022] In the diagram: 1-tank body, 2-upper non-woven fabric, 3-catalyst, 4-lower non-woven fabric, 5-mesh plate, 6-smoke filter layer, 7-tank bottom, 8-gas distribution plate. Detailed Implementation

[0023] To make the objectives, contents, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0024] This embodiment proposes a filter canister with a uniform airflow distribution plate structure, the overall structure of which is as follows: Figure 1 and 2 As shown, it mainly includes a tank body 1, an upper non-woven fabric 2, a catalyst 3, a lower non-woven fabric 4, a mesh plate 5, a smoke filter layer 6, a tank bottom 7, and a gas distribution plate 8.

[0025] The filter canister has a cylindrical axial flow structure. The canister body 1 is cylindrical, and the catalyst 3 is filled inside the canister body 1 in a layered manner. The mesh plate 5 is fixed to the inner wall of the canister body 1 by ultrasonic welding and presses the catalyst 3 from below. The upper and lower surfaces of the catalyst 3 are both planar structures, and the upper and lower surfaces of the catalyst 3 are respectively covered with an upper layer of non-woven fabric 2 and a lower layer of non-woven fabric 4. The canister bottom 7 is fixed to the bottom of the canister body 1 by ultrasonic welding. The gas distribution plate 8 is welded to the center hole of the canister bottom 7. The smoke filter layer 6 is fixed to the canister bottom 7 with adhesive and is located between the canister bottom 7 and the lower surface of the mesh plate 5.

[0026] like Figure 3 As shown, the gas distribution plate 8 is a circular perforated plate structure, which is fixed to the reinforcing ribs of the tank bottom 7 by ultrasonic welding. Both the upper and lower surfaces of the circular perforated plate are planar structures, and a series of circular holes of different diameters are evenly distributed in a ring from the inside to the outside on the perforated plate.

[0027] Compared to traditional structures without central openings, the filter canister of this invention employs a circular perforated plate structure with an array of circular holes, reducing the area obstructed by the filter paper and catalyst by approximately 20%. This not only reduces airflow resistance (by 4% at a flow rate of 45 L / min) but also results in a more uniform airflow distribution. Figure 4 As shown, this can significantly improve the efficiency of filter paper and catalyst, and extend the protection time of the filter canister.

[0028] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A filter canister with a uniform airflow distribution plate structure, characterized in that, The filter canister includes a canister body, catalyst, mesh plate, smoke filter layer, canister bottom, and gas distribution plate; wherein... The filter canister has a cylindrical axial flow structure. The canister body is cylindrical, and the catalyst is filled inside the canister body. The mesh plate is fixed to the inner wall of the canister body and presses the catalyst from below. The canister bottom is fixed to the bottom of the canister body, the gas distribution plate is fixed at the center hole of the canister bottom, and the smoke filter layer is fixed on the canister bottom and located between the canister bottom and the lower surface of the mesh plate. The gas distribution plate has a circular perforated plate structure, and a series of circular holes of different diameters are evenly distributed in a ring from the inside to the outside on the perforated plate.

2. The filter canister with a uniform airflow distribution plate structure as described in claim 1, characterized in that, The catalyst is packed inside the tank in a layered manner.

3. The filter canister with a uniform airflow distribution plate structure as described in claim 1, characterized in that, The mesh plate is fixed to the inner wall of the tank by ultrasonic welding.

4. The filter canister with a uniform airflow distribution plate structure as described in claim 1, characterized in that, The catalyst has a planar structure on both its upper and lower surfaces.

5. The filter canister with a uniform airflow distribution plate structure as described in claim 1, characterized in that, The catalyst is covered with non-woven fabric on its upper and lower surfaces, respectively.

6. The filter canister with a uniform airflow distribution plate structure as described in claim 1, characterized in that, The bottom of the tank is fixed to the bottom of the tank body by ultrasonic welding.

7. The filter canister with a uniform airflow distribution plate structure as described in claim 1, characterized in that, The gas distribution plate is welded to the center hole at the bottom of the tank.

8. The filter canister with a uniform airflow distribution plate structure as described in claim 1, characterized in that, The smoke filter layer is fixed to the bottom of the tank with an adhesive.

9. The filter canister with a uniform airflow distribution plate structure as described in claim 1, characterized in that, The gas distribution plate is a circular perforated plate structure, which is fixed to the reinforcing ribs at the bottom of the tank by ultrasonic welding.

10. The filter canister with a uniform airflow distribution plate structure as described in claim 1, characterized in that, The circular perforated plate has planar structures on both its top and bottom surfaces.

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