Anti-parabolic anti-folding structure of gas mask sealing frame

Abstract

The invention discloses an inverse-parabola-shaped retroflexed hem structure of a sealing frame of a gas mask. A retroflexed hem of the sealing frame is composed of a forehead part (1), a temple part(2), a cheek part (3) and a lower jaw part (4), wherein the forehead part (1), the temple part (2), the cheek part (3) and the lower jaw part (4) are all in left and right symmetry; the forehead partis in an inward concave inverse parabola shape, and the cross section shape of the forehead part is expressed as y=0.05x<2> minus 3.3x plus 45; the temple part is in an inward concave inverse parabolashape, and the cross section shape of the temple part is expressed as y=0.014x <2> minus 2x plus 39; the cheek part is in an inward concave inverse parabola shape, and the cross section shape of thecheek part is expressed as y=0.015x<2> minus 2x plus 35; and the lower jaw part comprises a lower jaw side part and a chin part, the lower jaw side part is in a straight shape, the cross section shapeof the lower jaw side part is expressed as y=0.16x plus 0.1, the chin part is in an inward concave inverse parabola shape, and the cross section shape of the chin part is expressed as y=0.024e<0.13x>. The concave surface of the retroflexed hem structure is directly attached to the face, and the physiological comfort of the wearer is improved due to the design of the retroflexed hem structure.

Description

technical field [0001] The invention belongs to the field of personal protective masks, and in particular relates to an anti-parabolic anti-folding structure of a tight-fitting frame of a gas mask. Background technique [0002] Airtightness is an important technical index of gas masks. The main component to achieve this index is the airtight frame of the gas mask, and the anti-folding edge is an important part of the airtight frame. The design of this part largely determines the anti-gas The design of the mask makes or breaks. After decades of development in China, the anti-folding section structures of gas masks in my country mainly include: straight line, sponge pad structure, T-type, double T-type, air cushion tube type and inner convex parabolic structure, which have been tested and tested by the market. Eliminated, the current general anti-flange cross-section forms are straight line and convex parabola. Straight-line folded edge is easy to mold processing and mass pro...

AI Technical Summary

Problems solved by technology

Straight-line folded edge is easy to mold processing and mass production, but the airtightness is poor; inwardly convex parabolic folded edge forms an inwardly convex structure at the contact part with the human face, that is, the cross-section of the folded edge is a parabola, but The convex end is in contact with the human face. This kind of reversed edge has good airtightness when worn, but the comfort is poor

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