Three-dimensional low-pressure folding mask

Abstract

The invention discloses a three-dimensional low-pressure folding mask which comprises at least one filtering piece. Fixing belts are connected on the filtering pieces. The three-dimensional low-pressure folding mask is characterized in that at least one Z-shaped first fold is arranged on each filtering piece, at least one Z-shaped second fold is arranged in a manner of being intersected with the first folds, and four sides are bonded after the filtering pieces are folded. When in use, the folds are pulled outward, a cavity can be formed in front of mouth and nose; each first fold can be drawn in a fold direction, so that the cavity formed is large in depth and abrupt in edge; most of the filtering pieces after being pulled open have wrinkles, so that enlarging of space between filtering faces of the filtering pieces and human faces is limited; when in use, only bonding positions around the filtering pieces contact with the human faces, so that contact area between the filtering faces of the filtering pieces and the human faces is small, the three-dimensional low-pressure folding mask is free of compressive feeling and comfortable to wear, and influence of breathing airflow on impact of the filtering pieces is reduced; filtering performance of each position of each filtering piece is brought into balanced play, so that microparticle penetrating probability caused by local large pressure difference of the filtering pieces is lowered.

Description

technical field [0001] The invention relates to a mask, in particular to a three-dimensional low-pressure folding mask. Background technique [0002] With the improvement of people's health awareness, masks have been used as a protective tool in various fields of our lives, such as medical treatment, chemical industry, furniture manufacturing and other industries. Today, we have to wear masks to travel when the environment is polluted in the process of industrialization To avoid smog damage, the main function of these masks is to isolate and filter microparticles and viruses, so as to avoid direct inhalation of microparticles and viruses into the lungs and cause negative effects on personal health. There are many kinds of existing masks, and the most commonly used ones are still mainly sheet-type and folded masks. The sheet-type masks are composed of several layers of filter sheets laid flat and stacked. Just pull it up and down, because the length of each fold in the horiz...

AI Technical Summary

Problems solved by technology

There are many kinds of existing masks, and the most commonly used ones are still mainly sheet-type and folded masks. The sheet-type masks are composed of several layers of filter sheets laid flat and stacked. Just pull it up and down, because the length of each fold in the horizontal direction is equal to the horizontal length of the upper and lower edges of the filter, and the fold length cannot be adjusted. The area is small, and the inner surface of the filter sheet will have partial contact with the human face due to the small depth of space when wearing it, which further reduces the effective filtering area of ​​the filter sheet; when these two kinds of masks are worn, the filter sheet can be stretched small, and the distance between the mouth and the nose can be filtered The inner surface of the filter is relatively close, so that the pressure difference between the inside and outside of the filter facing the mouth and nose is higher than that far away from the mouth and nose. The unbalanced pressure distribution makes the air flow and dust accumulation in different parts of the filter different, causing the filter to be unbalanced It exerts its filtration efficiency, and the high pressure difference, high flow rate, and high dust accumulation point are directly facing the mouth and nose, which greatly increases the penetration probability of the micro particles on the filter facing the mouth and nose under the high-speed airflow, and the filter is close to the mouth and nose. When breathing, the airflow has a strong impact on the filter, and vibration deformation will also increase the chance of microparticles passing through. When inhaling, the filter will be closer to the nostril under the action of suction, and the pressure difference between the inside and outside of the nostril is higher; Particle isolation is ultimately carried out through the filter, and its performance is mainly reflected in the isolation effect of the filter. In order to improve the filtration performance, it is mostly achieved through the modification of the filter. When it is necessary to isolate some tiny particles , the traditional method is to reduce the size of the micropores of the filter, but it also has disadvantages. When the micropores are very small, not only the airflow is not smooth and there is a feeling of suffocation, but also it is not conducive to reducing the pressure difference between the inside and outside of the filter. The air flow rate at the micropores increases as the ventilation area decreases. Driven by the high-speed airflow, the smaller particles adhering to the filter will pass through the micropores and enter the respiratory tract, especially on the filter with a smaller area. Yes; these problems still need to be improved to improve technology

The closest prior art patent document (publication number CN103857442A) discloses a nasal mask, which is provided with intersecting horizontal folds 110 and vertical folds 120, which can provide a 3D space in the nose when unfolded, and wear a belt 20 during use. The four corners of the cover body will be attached to the cheeks under the pulling of the body, and the filtering effect of this part is low. In addition, because the pulling direction of the wearing belt 20 is basically the same as the direction of the transverse folds, the ends of the transverse folds tend to close after being stressed, which affects the tension. Opening range affects the effective area of ​​the filter

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