A self-cleaning foam filter mask that can be used for a long time

Abstract

The present invention discloses a self-cleaning foam filter membrane mask that can be used for a long time. The mask mainly includes a strap, a mask membrane and a mask box body, and the three are sewn or bonded together. The mask box body is composed of a mask foam layer, a mask filter membrane layer, and a dust shaking-off channel. There is a certain space between the mask box body and the human mouth and nose for breathing. The mask box body contains a mask filter membrane layer and a mask foam layer, and the dust shaking-off channel is at the lower end of the mask box body. In the mask of the present invention, when a human body inhales and exhales, the gas first enters the foam layer of the mask. Driven by the flowing air, the plastic foam particles will collectively move back and forth in the direction of the filter membrane layer or have a tendency to move. Static electricity is generated between the plastic foam particles and between the plastic foam and the dust particles in the air due to friction. The attachment of charged dielectric particles replaces the function of the electret filter membrane. The electret filter membrane can actively adsorb dust particles in the air, enhance the filtering effect, and continue to ensure the filtering efficiency after long-term use.

Description

Technical Field

[0001] The invention relates to a self-cleaning foam filter membrane mask that can be used for a long time and belongs to the field of air filtration. Background Art

[0002] Masks are a common item in daily life, especially in cities and areas with severe air pollution. Disposable masks, due to their low cost, offer minimal filtering effectiveness. Commonly used dust and haze masks offer significantly improved filtering effectiveness compared to disposable masks, but they also suffer from the problem that with prolonged use, a large amount of airborne dust accumulates on the outermost filter membrane. This increases the mask's filtration resistance, with longer use resulting in greater breathing resistance. Furthermore, the mask's filter membrane porosity decreases, reducing filtration effectiveness.

[0003] To address this issue, the present invention has developed a self-cleaning foam filter mask that can be used for long periods of time. This mask reduces the impact of usage time on filtration resistance and filtration efficiency, and utilizes human respiration to increase filtration efficiency for airborne particles such as dust. This allows for long-term use while ensuring unobstructed breathing while maintaining the KN95 filtration efficiency required by national standard GB2626-2006. Summary of the Invention

[0004] This invention addresses the low filtration efficiency of conventional disposable masks and the decreased filtration resistance and efficiency of multi-layer masks over time. By doing so, it proposes a self-cleaning foam filter mask for long-term use. This allows for long-term use without replacing the filter membrane, while also enhancing the filtration efficiency of large particles and dust particles through the foam layer. This improves the mask's filtration efficiency at a low cost, maintaining both filtration resistance and efficiency even after extended use.

[0005] The present invention provides a self-cleaning foam filter membrane mask suitable for long-term use. The mask comprises a strap, a mask membrane, and a mask housing, all of which are sewn or bonded together. The strap is attached to the ear when worn and is arranged at the edge of the mask membrane, which fits the face. The mask housing is located outside the mask membrane. The mask housing comprises a foam layer, a filter membrane layer, and a dust-shaking channel, leaving a sufficient space between the mask housing and the mouth and nose for breathing. The mask housing contains the filter membrane layer and the foam layer, and the dust-shaking channel is located at the lower end of the mask housing.

[0006] The invention relates to a self-cleaning foam filter membrane mask that can be used for a long time. The strap and the mask membrane are made of skin-friendly fiber material and are highly stretchable. When worn by a human body, they will not tighten the face and cause discomfort.

[0007] The present invention relates to a self-cleaning foam filter membrane mask that can be used for a long time. The breathing position of the mouth and nose in the mask box simulates the shape of the human mouth and nose contour, and there is enough space. When the human body speaks, it will not be affected by the narrow space. Plastics and other materials with a certain rigidity and strength (sufficient to support the foam layer and the filter membrane layer) can be used to make the mask box frame. There are two layers in the mask box: the filter membrane layer and the foam layer. The foam layer is on the outside and the filter membrane layer is on the inside. The thickness of the foam layer is about 20 mm, and the foam layer is filled with plastic foam particles with a diameter of 0.5 mm to 1 mm, such as polystyrene (PS) foam particles. The total volume of the foam particles is about 60,000 mm 3 , accounting for 80% to 90% of the space. The length, width, and height of the mask box are designed and manufactured according to the size of the mask, and there are no special size regulations. In addition to PS foam particles, other lightweight, dry, and friction-resistant foam particles such as polyurethane (TPU) and polypropylene (PP) can also be used. When the human body inhales, the gas first enters the foam layer of the mask. Driven by the flowing air, the plastic foam particles will collectively move toward the filter membrane layer or have a tendency to move. At this time, static electricity is generated due to friction between the plastic foam particles and between the plastic foam and the dust particles in the air. The dielectric particles in the air will absorb and carry away this static electricity. These charged dielectric particles continue to move until they adhere to the filter membrane layer. The attachment of the charged dielectric particles replaces the function of the electret filter membrane (a dielectric that can retain an electric charge for a long time). The electret filter membrane can actively absorb dust particles in the air and enhance the filtering effect.

[0008] The present invention relates to a self-cleaning foam filter mask that can be used for long-term use. The mask's filter layer is a composite filter membrane composed of electrostatic cotton, nanometer-sized PP fibers, and non-woven fabric. It can filter most dust particles in the air. Testing has shown that the PM2.5 filtration efficiency exceeds 99%. In addition to this composite filter membrane, any type of mask filter or face mask can also be used. Commercially available masks can be glued to a mask case.

[0009] The present invention relates to a self-cleaning foam filter mask suitable for long-term use. The mask's dust-shaking channel is located below the foam layer in the mask housing, perpendicular to the foam layer and filter layer. The dust-shaking channel has no specific material requirements; any material, such as plastic, with a certain strength and rigidity can be used. The plastic foam layer filters out some large dust particles in the air. Because the plastic foam layer contains voids, which account for 10% to 20% of its volume, exhalation displaces the foam particles. The movement between the foam particles causes dust particles accumulated in the foam layer to fall off, passing through the mask filter and onto the dust-shaking channel. The mask filter has a mesh diameter of approximately 0.2 mm. There are no specific requirements for this mesh diameter; it can be a mesh diameter that can hold the plastic foam particles and is smaller than the diameter of the foam particles. This mesh filter removes dust particles accumulated in the foam layer. The dust-shaking channel is tilted outward at an angle of between 15° and 25° relative to the mask housing, allowing dust to escape from the mask housing along the dust-shaking channel.

[0010] The present invention provides a self-cleaning foam filter membrane mask that can be used for a long time. Due to the mask body structure, when a person inhales and exhales, gas first enters the foam layer of the mask. Driven by the flowing air, the plastic foam particles will collectively move back and forth toward the filter membrane layer or have a tendency to move. Static electricity is generated due to friction between the plastic foam particles and between the plastic foam and air dust particles. Dielectric particles in the air will absorb and carry away this static electricity. These charged dielectric particles continue to move until they adhere to the filter membrane layer. The adhesion of the charged dielectric particles replaces the function of the electret filter membrane (a dielectric that can retain an electric charge for a long time). The electret filter membrane can actively absorb dust particles in the air and enhance the filtering effect. The purpose of long-term use is achieved without replacing the filter membrane. At the same time, the foam layer can also increase the filtering effect on large molecular particles and dust. The filtering efficiency of the mask is improved while being low in cost; and the filtering resistance and filtering efficiency can continue to be guaranteed after long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of a self-cleaning foam filter mask that can be used for a long time according to the present invention;

[0012] Figure 2 yes Figure 1 The schematic diagram of the mask box during exhalation and inhalation shown, where a shows the exhalation effect and b shows the inhalation effect;

[0013] Figure 3 This is an example diagram of a self-cleaning foam filter mask that can be used for a long time according to the present invention;

[0014] Figure 4 yes Figure 3 A cross-sectional view of section AA in the mask example diagram shown;

[0015] Figure 5 This is a box example diagram of an example of a self-cleaning foam filter membrane mask that can be used for a long time according to the present invention.

[0016] In the figure: 1-mask strap; 2-mask membrane; 3-mask box body; 3-1-foam layer mask; 3-2-plastic foam particles; 3-3-foam layer breathing filter; 3-4-dust shaking-off channel; 3-5-dust shaking-off channel filter; 3-6-mask filter membrane layer; 3-7-mouth and nose breathing position; 3-8-box frame. DETAILED DESCRIPTION

[0017] The present invention provides a self-cleaning foam filter mask that can be used for a long time. Figure 1 As shown, the mask mainly includes a strap 1, a mask membrane 2, and a mask box 3. The mask box 3 includes a foam layer mask 3-1, plastic foam particles 3-2, a foam layer breathing filter 3-3, a dust shaking channel 3-4, a dust shaking channel filter 3-5, a mask filter membrane layer 3-6, a mouth and nose breathing position 3-7 and a box frame 3-8. Figure 4 shown.

[0018] The mask strap 1 is hung at the ear; the mask membrane 2 fits the human face; the mouth and nose breathing positions 3-7 leave enough space between them and the human mouth and nose, as shown in the three-dimensional diagram of the mask. Figure 3 and Figure 4 As shown, the narrow space does not affect the human body when speaking. In addition, the edges of the mouth and nose breathing positions 3-7 fit tightly with the human face, ensuring that the human body inhales air that has been filtered through the entire box.

[0019] When the human body inhales, the inhaled air passes through the foam layer mask 3-1 and the plastic foam particles 3-2 in sequence. Driven by the flowing air, the plastic foam particles 3-2 will collectively move toward the direction of the mask filter membrane layer 3-6 or have a tendency to move. Figure 2 As shown in b, this movement trend includes downward and rightward trends. At this time, friction between the plastic foam particles 3-2 and between the plastic foam and air particles generates static electricity. Dielectric particles in the air will carry away this static electricity. These charged dielectric particles will continue to move until they adhere to the mask filter membrane layer 3-6. The adhesion of the charged dielectric particles will increase the filtering effect of the mask filter membrane layer 3-6. Figure 3 、 Figure 4 The material of the plastic foam particles in the embodiment shown can be polystyrene (PS), polyurethane (TPU), polypropylene (PP) and other foamable materials.

[0020] When the human body exhales, due to the structure of the mouth and nose breathing position 3-7 Figure 4As shown, the exhaled gas of the human body flows from bottom to top, and the PS plastic particles 3-2 in the foam layer 3-1 of the mask are small spherical particles with a diameter of 0.5mm to 1mm. They are light in texture and are easier to move under the action of force. Figure 2 As shown in a, it ensures that the plastic foam particles 3-2 can be fully blown by the gas exhaled by the human body. There are 10% to 20% gaps in the volume of the plastic foam particles, so there is enough space between the foam particles to move with each other under the action of human exhalation, and the dust particles accumulated on the plastic foam particles 3-2 will be shaken off and fall on the dust shaking channel 3-4 through the dust shaking channel filter 3-5. The mesh gap of the dust shaking channel filter 3-5 is about 0.2mm, and its gap is relatively large relative to the dust particles, which can filter out the dust particles accumulated on the plastic foam particles 3-2. The dust shaking channel 3-4 has an inclination angle of 15° to 25° relative to the mask box body 3. After the dust falls, it will be discharged from the mask box body along the dust shaking channel 3-4, as shown Figure 5 shown.

Claims

1. A self-cleaning foam filter mask that can be used for a long time, characterized by: It mainly includes a strap, a mask membrane and a mask box body, and the three are sewn or bonded together; the strap is hung on the ear when worn, and the strap is arranged on the edge of the mask membrane. The mask membrane fits the human face, and the mask box body is on the outside of the mask membrane. The mask box body is composed of a mask foam layer, a mask filter membrane layer, and a dust shaking-off channel. There is a certain space between the mask box body and the human mouth and nose for breathing; the mask box body contains a mask filter membrane layer and a mask foam layer, and the dust shaking-off channel is at the lower end of the mask box body; the mask filter membrane layer is a composite filter membrane composed of electrostatic cotton, PP fiber with a diameter of nanometer level, and non-woven fabric; the dust shaking-off channel of the mask is located below the foam layer in the mask box body, perpendicular to the foam layer and the filter layer, and the material of the dust shaking-off channel is plastic with certain strength and rigidity; the dust shaking-off channel has an inclination angle between 15° and 25° relative to the mask box body, and is tilted outward. After the dust falls, it will be discharged from the mask box body along the dust shaking-off channel.

2. The self-cleaning foam filter mask that can be used for a long time according to claim 1, characterized in that: The mask box has two layers: a filter membrane layer and a foam layer. The foam layer is on the outside and the filter membrane layer is on the inside. The thickness of the foam layer is 20mm. The foam layer is filled with plastic foam particles with a diameter of 0.5mm to 1mm. The total volume of the foam particles is 60000mm. 3 , the space occupies 80% to 90%.

3. The self-cleaning foam filter mask that can be used for a long time according to claim 2, characterized in that: The material of plastic foam particles is polystyrene, polyurethane or polypropylene.

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