Protective mask

Abstract

The invention relates to a protective mask which comprises a mask body, a breather valve and a fixing band, and the fixing band and the breather valve are both arranged on the mask body. The breathervalve comprises a valve seat, a valve element and a valve deck, a breathing cavity is formed between the valve deck and the valve seat, a first vent hole and a second vent hole are formed in the valvedeck and the valve seat respectively, the valve element comprises a valve element body and a limiting boss, the valve element body is of a foldable and telescopic tubular structure, the two ends of the valve element body are connected with the valve seat and the limiting boss correspondingly, the limiting boss can be arranged in the first vent hole in a sliding mode, a sealing ring is arranged between the valve element body and the limiting boss, the breather valve is in an inspiration state, the sealing ring seals the first vent hole, the breather valve is in an expiration state, the valve element body is compressed into the breathing cavity, and the first vent hole, the breathing cavity and the second vent hole are communicated. The technical problems that the protective mask is poor inprotective effect and large in respiratory resistance, a valve plate is prone to damage, bacteria are prone to breeding after the mask is worn for a long time, and the disposable filter element is high in cost are solved.

Description

technical field [0001] The invention relates to the field of sanitary products, in particular to a protective mask. Background technique [0002] Protective masks can filter the air entering the human respiratory tract. After wearing, the user can effectively prevent harmful substances such as dust, particles and pathogens inhaled through the mouth or nose, thereby reducing the threat of air pollution to human health. [0003] According to the number of times of use, protective masks can be divided into disposable masks and replaceable filter masks. Replaceable filter masks can regain the protective effect only by changing the filter each time. Can be worn for a long time. In addition, protective masks are divided into two structures with breathing valve and without breathing valve according to different use occasions. In the working environment with hot and humid, poor ventilation and heavy labor, protective masks with breathing valve can improve Comfort for the wearer. ...

AI Technical Summary

Problems solved by technology

[0005] 1. For replaceable protective masks, the sealing part in contact with the face needs to be used for a long time. If it is not cleaned in time, there will be a risk of bacterial growth, irritating the skin, and causing infection;

[0006] 2. Regardless of whether it is a disposable protective mask or a replaceable valve core mask, the filter layer basically adopts a three-layer structure of non-woven fabric, filter material and non-woven fabric. The filter material used cannot be cleaned and disinfected for reuse. Not only waste of resources and cause environmental pollution;

[0007] 3. For disposable protective masks without breathing valve, especially self-priming filter masks, the exhalation resistance is required: KN (mask type is suitable for filtering non-oily particles) 90 or KP (mask type is suitable for filtering oily particles) 90≤ 170Pa, KN95 or KP95≤210Pa, KN100 or KP100≤250Pa, inspiratory resistance: KN90 or KP90≤170Pa, KN95 or KP95≤210Pa, KN100 or KP100≤250Pa, the current commercially available protective masks generally have a total exhalation resistance of 190Pa, the total The inspiratory resistance is about 158Pa. Although it can meet the required standard, the wearer will still feel suffocated after wearing it for a long time. Filter material, if the filter material is too thin, it will not be able to prevent dust particles and pathogens, if the filter material is too thick and dense, it will hinder sufficient air flow in and out, and it is easy to suffer from hypoxia when worn for a long time Discomfort such as dizziness and chest tightness occurs; for protective masks with breathing valves, the existence of breathing valves reduces the exhalation resistance to a certain extent. The total inhalation resistance of commercially available masks with breathing valves can reach 78Pa, and the total exhalation resistance can reach about 40Pa. , can fully meet the required standards, but due to defects in structural design and other aspects, there are still problems such as large exhalation resistance and protection defects, mainly because the commonly used protective masks with breathing valves often use wafer-type single When the wearer exhales normally, the valve cannot be fully opened due to the low exhalation pressure. The gas in the protective mask can only leak out from the periphery of the valve, and the exhalation resistance is relatively large. When the wearer inhales, the valve plate has the disadvantage that it cannot rebound and reset in time, and there is a phenomenon that the external gas directly enters the protective mask through the breathing valve, which reduces the protective effect of the protective mask or even disappears. When used for a long time, uneven force on the surface of the valve plate is likely to cause the valve plate to bend and crack, resulting in damage and failure of the protective mask

[0008] Aiming at the problems of poor protective effect of protective masks in related technologies, large breathing resistance, easy damage to the valve plate, easy breeding of bacteria after long-term wearing, and high cost of disposable filter elements, no effective solution has been given so far.

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