A filter cartridge and respiratory filter

Abstract

The application provides a filter box and a breathing filter, and belongs to the technical field of air filter equipment. The filter box comprises a front shell and a rear shell. The top of the rear shell is provided with a rear protruding part extending upward. The rear shell wraps the mouth of a human body, and the rear protruding part wraps the nose of the human body. A rear air inlet is formed in the rear side wall of the rear shell. An air inlet valve is mounted on the rear side of the rear air inlet. The rear side wall of the rear shell below the air inlet is inclined to the rear side. A rear air outlet is formed in the rear protruding part. An air outlet valve is mounted on the front side of the rear air outlet. The gap between the rear shell and the nose and the mouth of the human body constitutes a breathing cavity in communication. The filter box provided by the application does not need to penetrate the bottom of the rear shell. Therefore, the part of the filter cavity below the rear air inlet can be inclined to the rear side, thereby increasing the space of the filter cavity, filling more filter fillers in the filter cavity, and improving the filtering effect.

Description

Technical Field

[0001] This application belongs to the field of air filtration equipment technology, and more specifically, relates to a filter cartridge and a breathing filter using the filter cartridge. Background Technology

[0002] Breathing filters can be used for dust or gas protection and are important protective equipment in heavy-duty work environments. Breathing filters include a filter cartridge, inside which is a filter chamber filled with filter media. The filter cartridge has an air inlet and an air outlet, and an air outlet channel needs to be set inside the filter cartridge to communicate with the air outlet. This air outlet channel runs through the entire filter cartridge from top to bottom, which results in a small filter chamber and affects the filtration effect. Utility Model Content

[0003] The purpose of this application is to provide a filter cartridge that addresses the problem that existing filter cartridges have a small filter chamber, which affects the filtration effect.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: a filter cartridge is provided, comprising: a front shell and a rear shell, wherein the front shell has an inlet, and the rear shell is connected to the rear side of the front shell, forming a filter chamber for placing filter media between the front shell and the rear shell; the top of the rear shell has an upwardly extending rear protrusion, which is located in front of the nose of the human body and has a rearward wrapping shape; a rear air inlet is provided on the rear side wall of the rear shell, and an air inlet valve is installed on the rear side of the rear air inlet; the rear side wall of the rear shell below the air inlet is inclined to the rear; a rear air outlet is provided on the rear protrusion, and an air outlet valve is installed on the front side of the rear air outlet; the rear shell and the rear protrusion form a breathing chamber that communicates with the human face, and both the rear air inlet and the rear air outlet are in communication with the breathing chamber.

[0005] In one possible implementation, there are two rear air vents, located on either side of the nose.

[0006] In one possible implementation, the bottom of the front housing and / or the rear housing is provided with a feeding port communicating with the filter chamber, and a feeding cover is installed at the feeding port.

[0007] In one possible implementation, the feeding cover is movably connected to the front housing and / or the rear housing.

[0008] In one possible implementation, the feeding cover is made of a flexible material, and an annular groove is formed on the outer peripheral surface of the feeding cover to engage with the feeding port.

[0009] In one possible implementation, the bottom of the rear housing is provided with a support extending forward.

[0010] In one possible implementation, the rear housing is covered with a filter layer, the mounting surface of which is an inclined surface that slopes backward on the left, right and lower sides of the rear air intake; the outer edge of the filter layer has a cut-off slit extending toward its center so that the filter layer is completely fitted to its mounting surface.

[0011] In one possible implementation, the foremost point of the rear air outlet is located in front of the foremost point of the rear air inlet.

[0012] In one possible implementation, the outer contour of the filter layer and the cut seam are both fixedly connected to the rear housing.

[0013] Compared with the prior art, the filter cartridge of this application has an inlet on the front shell and a rear inlet on the rear side wall of the rear shell, forming a filter chamber between the front and rear shells. The filter packing is placed in the filter chamber. An air inlet valve is installed on the rear side of the rear air inlet on the rear shell. A rear protrusion is provided on the top of the rear shell. An air inlet valve is installed on the rear side of the rear air inlet of the rear shell. The rear protrusion is in front of the nose of the human body and has a rearward wrapping shape. The rear shell and the rear protrusion form a breathing chamber that is interconnected with the human face. Both the rear air inlet and the rear air outlet are connected to the breathing chamber. During inhalation, the inlet valve opens while the outlet valve closes. Outside air passes sequentially through the inlet, filter chamber, rear inlet, and breathing chamber, ultimately entering the mouth and nose. During exhalation, the inlet valve closes while the outlet valve opens. Air exhaled from the nose and mouth passes sequentially through the breathing chamber and rear outlet, finally exiting the filter cartridge. Existing filter cartridges have their outlet located at the bottom of the rear housing, requiring the breathing chamber to extend from top to bottom through the entire rear housing before exiting from the bottom. In contrast, the filter cartridge of this application places the rear outlet on a protruding section at the top of the rear housing. Therefore, the breathing chamber does not need to extend through the bottom of the rear housing, allowing the portion of the filter chamber below the rear inlet to tilt rearward, increasing the filter chamber's space. This allows for more filter media to be filled within the filter chamber, thereby improving filtration efficiency.

[0014] Another object of this application is to provide a breathing filter comprising any of the above-described filter cartridges.

[0015] Compared with the prior art, the solution shown in this application embodiment uses a filter cartridge with an inlet on the front shell and a rear inlet on the rear side wall of the rear shell. A filter chamber is formed between the front and rear shells, and filter packing is placed in the filter chamber. An air inlet valve is installed on the rear side of the rear air inlet on the rear shell. A rear protrusion is provided on the top of the rear shell, and an air inlet valve is installed on the rear side of the rear air inlet of the rear shell. The rear protrusion is in front of the nose of the human body and has a rearward wrapping shape. The rear shell and the rear protrusion form a breathing chamber that is interconnected with the human face. Both the rear air inlet and the rear air outlet are connected to the breathing chamber. During inhalation, the inlet valve opens while the outlet valve closes. Outside air passes sequentially through the inlet, filter chamber, rear inlet, and breathing chamber, ultimately entering the mouth and nose. During exhalation, the inlet valve closes while the outlet valve opens. Air exhaled from the nose and mouth passes sequentially through the breathing chamber and rear outlet, finally exiting the filter cartridge. Existing filter cartridges have their outlet located at the bottom of the rear housing, requiring the breathing chamber to extend from top to bottom through the entire rear housing before exiting from the bottom. In contrast, the filter cartridge of this application places the rear outlet on a protruding section at the top of the rear housing. Therefore, the breathing chamber does not need to extend through the bottom of the rear housing, allowing the portion of the filter chamber below the rear inlet to tilt rearward, increasing the filter chamber's space. This allows for more filter media to be filled within the filter chamber, thereby improving filtration efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 An exploded view of a filter cartridge (with a hidden filter layer) provided in an embodiment of this application;

[0018] Figure 2 A three-dimensional structural diagram of a filter cartridge (concealing the front shell and filter layer) provided for an embodiment of this application;

[0019] Figure 3 This is a three-dimensional structural diagram of the feeding cover provided in an embodiment of this application;

[0020] Figure 4 A top view of a filter cartridge (with the front housing hidden) provided for an embodiment of this application;

[0021] Figure 5 This is a schematic diagram showing the unfolded filter layer provided in an embodiment of this application.

[0022] In the diagram: 1. Front housing; 101. Front air inlet; 102. Front protrusion; 103. Front air outlet; 2. Rear housing; 201. Rear protrusion; 202. Rear air inlet; 203. Air inlet valve; 204. Rear air outlet; 205. Air outlet valve; 206. Feed port; 207. Feed cover; 208. Annular groove; 209. Support; 210. Filter layer; 211. Cutting seam; 3. Filter chamber; 4. Cover. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0024] Please refer to the following: Figure 1 and Figure 2 The present application provides a filter cartridge. The filter cartridge includes a front housing 1 and a rear housing 2. The front housing 1 has an inlet 101, and the rear housing 2 is connected to the rear side of the front housing 1. A filter chamber 3 for placing filter media is formed between the front housing 1 and the rear housing 2. The top of the rear housing 2 has an upwardly extending rear protrusion 201 that covers the mouth of the user and the nose of the user. A rear air inlet 202 is provided on the rear side wall of the rear housing 2, and an air inlet valve 203 is installed on the rear side of the rear air inlet 202. The rear side wall of the rear housing 2 below the air inlet is inclined rearward. A rear air outlet 204 is provided on the rear protrusion 201, and an air outlet valve 205 is installed on the front side of the rear air outlet 204. The gap between the rear housing 2 and the nose and mouth of the user forms a communicating breathing chamber.

[0025] The filter cartridge provided in this embodiment, compared with the prior art, has an inlet 101 on the front housing 1 and a rear inlet 202 on the rear side wall of the rear housing 2. A filter chamber 3 is formed between the front housing 1 and the rear housing 2. The filter packing is placed in the filter chamber 3. An air intake valve 203 is installed on the rear side of the rear inlet 202 on the rear housing 2. A rear protrusion 201 is provided on the top of the rear housing 2. An air intake valve 203 is installed on the rear side of the rear inlet 202 of the rear housing 2. The rear protrusion 201 is in front of the nose of the human body and has a rearward wrapping shape. The rear housing 2 and the rear protrusion 201 form a breathing chamber that is interconnected with the human face. The rear inlet 202 and the rear outlet 204 are both connected to the breathing chamber. During inhalation, the inlet valve 203 opens while the outlet valve 205 closes. External air passes sequentially through the inlet 101, the filter chamber 3, the rear inlet 202, and the breathing chamber, ultimately entering the mouth and nose. During exhalation, the inlet valve 203 closes while the outlet valve 205 opens. Air exhaled from the nose and mouth passes sequentially through the breathing chamber and the rear outlet 204, ultimately exiting the filter cartridge. Currently, the outlet of the filter cartridge is located at the bottom of the rear housing 2, so the breathing chamber needs to extend from top to bottom through the entire rear housing 2 of the filter cartridge before exiting from the bottom. The filter cartridge of this application has the rear air outlet 204 located on the rear protrusion 201 at the top of the rear housing 2. Therefore, the breathing chamber does not need to penetrate the bottom of the rear housing 2. Thus, the part of the filter chamber 3 located below the rear air inlet 202 can be tilted to the rear, thereby increasing the space of the filter chamber 3. More filter filler can be filled in the filter chamber 3, thereby improving the filtration effect.

[0026] In some embodiments, please refer to Figure 1 The front housing 1 has an upwardly extending forward protrusion 102 at its top, corresponding to the rear protrusion 201. A front air outlet 103 is provided on the front protrusion 102. In this embodiment, the front protrusion 102 is located at the top of the front housing 1 and extends upward. The front protrusion 102 covers the outside of the rear protrusion 201, thereby protecting the air outlet valve 205 on the rear protrusion 201. Multiple front air outlets 103 are evenly distributed on the front protrusion 102. Exhaled air passes through the rear air outlet 204 and is then discharged through the front air outlets 103.

[0027] In some embodiments, please refer to Figure 1 and Figure 2 There are two rear air outlets 204, located on both sides of the nostrils. In this embodiment, the two rear air outlets 204 are located on both sides of the nostrils. Since the rear air outlets 204 correspond to the nasal cavity outlets, the air exhaled from the nose can be quickly discharged through the rear air outlets 204.

[0028] In some embodiments, please refer to Figure 1 and Figure 2 The included angle between the inner sides of the planes corresponding to the two rear air outlets 204 is less than 180°. In this embodiment, the planes corresponding to the two rear air outlets 204 are set at an angle. This plane can conform to the shape of the human nose, increase the surface area of ​​the rear protrusion 201, and thus effectively increase the opening area of ​​the rear air outlets 204, increase the ventilation volume, and thus improve the smoothness of exhalation after wearing.

[0029] In some embodiments, please refer to Figure 1 The bottom of the front housing 1 and / or the rear housing 2 is provided with a feeding port 206 communicating with the filter chamber 3, and a feeding cover 207 is installed at the feeding port 206. In this embodiment, the feeding port 206 is located at the bottom of the rear housing 2. The feeding cover 207 seals the feeding port 206 to prevent leakage of the filter packing. The front housing 1 and the rear housing 2 are fixed together by welding. The filter packing is activated carbon. Particulate filter packing is added to the filter chamber 3 through the feeding port 206. Since the rear sidewall of the rear housing 2, located below the air inlet, is inclined to the rear, the bottom area of ​​the rear housing 2 is increased, that is, the plane area where the feeding port 206 is located is increased. Therefore, the size of the feeding port can be made larger, which facilitates the addition of particulate filter packing to the filter chamber 3 and improves the addition efficiency.

[0030] In some embodiments, please refer to Figure 1 The filling cover 207 is movably connected to the front housing 1 and / or the rear housing 2. In this embodiment, the filter chamber 3 of existing filter cartridges is a sealed structure, and the filling cover 207 is welded to the rear housing 2, making it impossible to replace the filter media. Therefore, when the filter media fails, it cannot be replenished or replaced, rendering the filter cartridge a disposable product with excessively high operating costs. Since the filling cover 207 is movably connected to the rear housing 2, it can be opened, facilitating the replenishment or replacement of the filter media, extending the service life of the filter cartridge, and reducing operating costs.

[0031] In some embodiments, please refer to Figure 1 and Figure 3 The feeding cap 207 is made of a flexible material, and an annular groove 208 is formed on its outer circumferential surface to engage with the feeding port 206. In this embodiment, the feeding cap 207 is made of silicone, which is a flexible material capable of elastic deformation. The feeding port 206 is an elongated hole. The outer contour of the feeding cap 207 is larger than the outer contour of the feeding port 206, but they are the same shape. The annular groove 208 is formed on the outer circumferential surface of the feeding cap 207. The feeding cap 207, through its own elastic deformation, causes the entire circumference of the feeding port 206 to engage with the annular groove 208, thereby fixing the feeding cap 207 to the feeding port 206.

[0032] In some embodiments, please refer to Figure 1 The bottom of the rear housing 2 is provided with a support portion 209 extending forward. In this embodiment, the support portion 209 is located at the bottom of the rear housing 2 and extends forward, thereby increasing the area of ​​the plane where the feeding port 206 is located, so the size of the feeding port 206 can be made larger.

[0033] In some embodiments, please refer to Figure 1 , Figure 4 and Figure 5 The rear housing 2 is covered with a filter layer 210. The mounting surface of the filter layer 210 is a sloped surface that curves backward on the left, right, and bottom sides of the rear air inlet 202. A cut-off slit 211 extending towards the center is provided on the outer edge of the filter layer 210 to ensure complete contact between the filter layer 210 and its mounting surface. In this embodiment, the inner wall of the rear housing 2 has vertical ribs, and the filter layer 210 is laid flat on the front side of the vertical ribs. The front side of the filter layer 210 is composed of granular filter media. The filter layer 210 can be filter paper or filter cloth. The filter layer 210, the inner wall of the rear housing 2, and the vertical ribs form an airway. The gas passes through the filter media and the filter layer 210 in sequence, then enters the breathing chamber through the rear air inlet 202, and is finally inhaled into the human body. All vertical ribs maintain a consistent height, meaning the front side of the vertical ribs conforms to the shape of the inner wall of the rear housing 2. Therefore, the mounting surface of the filter layer 210 is a sloped surface that curves backward on the left, right, and bottom sides of the rear air inlet 202. To prevent wrinkles from forming when the filter layer 210 is laid flat on the ribs, a cutting slit 211 is made in the filter layer 210, extending from the outer edge of the filter layer 210 towards the center. There are two cutting slits 211, corresponding to the intersection of the two inclined surfaces. When the filter layer 210 is laid flat following the shape of the front side of the rib, the two cutting slits 211 overlap to form a funnel-shaped three-dimensional structure. This three-dimensional structure is then bonded to the filter layer 210 (ultimately forming a double-layer structure at the cutting slits 211), thus preventing wrinkles from forming in the filter layer 210.

[0034] In some embodiments, please refer to Figure 1 , Figure 4 and Figure 5 The foremost point of the rear air outlet 204 is located in front of the foremost point of the rear air inlet 202. In this embodiment, the foremost point of the rear air outlet 204 is projected onto the horizontal plane in front of the foremost point of the rear air inlet 202. Therefore, the bottom of the area corresponding to the tip of the nose of the human body is recessed into the inner side of the rear housing 2, making the overall center of gravity of the rear filter cartridge closer to the face, making it lighter to wear and shorter torsional arm.

[0035] In some embodiments, please refer to Figure 1 , Figure 4 and Figure 5 The outer contour of the filter layer 210 and the cutting seam 211 are fixedly connected to the rear housing 2. In this embodiment, to achieve the stability of the filter layer 210 within the rear housing 2, the outer contour of the filter layer 210 and the cutting seam 211 are fixedly connected to the rear housing 2 by heat fusion or ultrasonic welding. A cross-shaped rib is provided on the rear housing 2, which corresponds to the cutting seam 211. The cutting seam 211 is fixedly connected to the cross-shaped rib to prevent misalignment of the filter layer 210.

[0036] This application also provides a breathing filter, including any of the above-mentioned filter cartridges. Compared with the prior art, the filter cartridge used in this application has an inlet 101 on the front housing 1 and a rear inlet 202 on the rear side wall of the rear housing 2. A filter chamber 3 is formed between the front housing 1 and the rear housing 2, and the filter packing is placed in the filter chamber 3. An air inlet valve 203 is installed on the rear side of the rear inlet 202 on the rear housing 2. A rear protrusion 201 is provided on the top of the rear housing 2. An air inlet valve 203 is installed on the rear side of the rear inlet 202 of the rear housing 2. The rear protrusion 201 is in front of the nose of the human body and has a rearward wrapping shape. The rear housing 2 and the rear protrusion 201 form a breathing chamber that is interconnected with the human face. The rear inlet 202 and the rear outlet 204 are both connected to the breathing chamber. During inhalation, the inlet valve 203 opens while the outlet valve 205 closes. External air passes sequentially through the inlet 101, the filter chamber 3, the rear inlet 202, and the breathing chamber, ultimately entering the mouth and nose. During exhalation, the inlet valve 203 closes while the outlet valve 205 opens. Air exhaled from the nose and mouth passes sequentially through the breathing chamber and the rear outlet 204, ultimately exiting the filter cartridge. Currently, the outlet of the filter cartridge is located at the bottom of the rear housing 2, so the breathing chamber needs to extend from top to bottom through the entire rear housing 2 of the filter cartridge before exiting from the bottom. The filter cartridge of this application has the rear air outlet 204 located on the rear protrusion 201 at the top of the rear housing 2. Therefore, the breathing chamber does not need to penetrate the bottom of the rear housing 2. Thus, the part of the filter chamber 3 located below the rear air inlet 202 can be tilted to the rear, thereby increasing the space of the filter chamber 3. More filter filler can be filled in the filter chamber 3, thereby improving the filtration effect.

[0037] A breathing filter also includes a cover 4, which is detachably installed on the rear side of the front housing 1 or the rear housing 2. The inner side of the cover 4 can form a breathing cavity for accommodating the mouth and nose of the human body, and for sealing the mouth and nose of the human body. In order to ensure the fit and sealing of the cover 4 to the human face, the cover 4 is made of an elastic material, such as silicone or rubber.

[0038] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A filter cartridge, characterized in that, include: The device comprises a front housing and a rear housing. The front housing has an inlet air inlet, and the rear housing is connected to the rear side of the front housing. A filter chamber for placing filter media is formed between the front housing and the rear housing. The top of the rear housing has an upwardly extending rear protrusion, which is located in front of the nose and wraps around the rear. The rear sidewall of the rear housing has a rear inlet air inlet, and an inlet valve is installed on the rear side of the rear inlet air inlet. The rear sidewall of the rear housing below the inlet air inlet air is inclined to the rear. The rear protrusion has a rear outlet air inlet air, and an outlet valve is installed on the front side of the rear outlet air inlet air. The rear housing and the rear protrusion form a breathing chamber that is interconnected with the human face. Both the rear inlet air ...

2. A filter cartridge as described in claim 1, characterized in that, There are two rear air vents, located on both sides of the nose.

3. A filter cartridge as described in claim 1, characterized in that, The bottom of the front housing and / or the rear housing is provided with a feeding port that communicates with the filter chamber, and a feeding cover is installed at the feeding port.

4. A filter cartridge as described in claim 3, characterized in that, The feeding cover is movably connected to the front housing and / or the rear housing.

5. A filter cartridge as described in claim 4, characterized in that, The feeding cover is made of flexible material, and an annular groove is formed on the outer circumference of the feeding cover to engage with the feeding port.

6. A filter cartridge as described in claim 1, characterized in that, The bottom of the rear housing is provided with a support extending forward.

7. A filter cartridge as described in claim 5, characterized in that, The rear housing is covered with a filter layer, and the mounting surface of the filter layer is an inclined surface that slopes backward on the left, right and lower sides of the rear air intake; the outer edge of the filter layer has a cutting slit extending towards its center so that the filter layer is completely fitted to its mounting surface.

8. A filter cartridge as described in claim 1, characterized in that, The foremost point of the rear air outlet is located in front of the foremost point of the rear air inlet.

9. A filter cartridge as described in claim 7, characterized in that, The outer contour of the filter layer and the cut seam are both fixedly connected to the rear housing.

10. A breathing filter, characterized in that, Includes a filter cartridge as described in any one of claims 1-9.

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