Method for determining air supply angle and air volume of open type porous air beam in effective suction range of human body

Abstract

The invention discloses a method for determining the air supply angle and the air volume of an open porous air beam in an effective suction range of a human body, and belongs to the technical field of respiratory protection. Comprising the following steps: S10, for a user, establishing a three-dimensional negative pressure map according to the relationship between the negative pressure value change at the mouth and nose and space coordinates when the user inhales, and determining an individual effective suction range of the user; s20, an air supply point is set, and according to the three-dimensional negative pressure map, the maximum negative pressure point air supply angle alpha M, the maximum air supply distance air supply angle alpha F, the highest air supply position air supply angle alpha H and the lowest air supply position air supply angle alpha L of the air supply point are determined; and S30, an air supply volume calculation model is established, and the air supply volume at each air supply angle is calculated. According to the method, the optimal air supply angle and the lowest air supply amount of the porous air beam can be accurately quantified based on the time-varying three-dimensional negative pressure atlas of the effective suction range of the human body, and the air supply angle and the air quantity of the porous air beam based on wing point arterial pressure monitoring are finally regulated and controlled in real time.

Description

technical field [0001] The invention belongs to the technical field of respiratory protection, and more specifically relates to a method for determining the air supply angle and air volume of an open multi-hole air beam in the effective suction area of ​​a human body. Background technique [0002] Occupational pneumoconiosis is defined in the "Diagnostic Criteria for Occupational Pneumoconiosis" (GBZ70-2015) as: "Diffuse fibrous fibrosis in the lung tissue caused by long-term inhalation of productive mineral dust and retention in the lungs during occupational activities. It can be seen that pneumoconiosis is caused by inhalation of floating dust in the external air by the mouth and nose, and because the inspiratory flow generated by the human body during the inhalation process of the mouth and nose is limited, the content of the air that can be inhaled by the mouth and nose of the human body Dust air is also limited to the vicinity of the mouth and nose, which is also stipul...

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Problems solved by technology

[0004] As the name implies, the self-priming type mainly relies on the work of the human respiratory muscles to overcome the resistance of the filter material and purify the dust-laden airflow. It can only reduce the dust concentration in the mask to 1 / 10 of the outside world), and the application reliability is poor in high-concentration dust environments; while the power type usually arranges and integrates the filter cotton, fan, and battery in sequence and bundles them around the waist of the dust-exposing worker During the period, the fan is driven by the battery to suck the dusty air from the outside to flow through the filter cotton, and the filtered and purified air is transported to the mask for breathing through the long air duct from the waist to the mask; Suction type has the disadvantages of high inhalation resistance, but power type masks are mostly head-mounted, which is difficult to fit with the safety helmets required by many industrial and mining sites, and due to the complex production conditions in industrial and mining dust production sites, the long flexible air duct will Interfere with workers' daily operations

[0005] In addition to the above-mentioned defects, a major common problem in existing individual dust-proof equipment is that a mask needs to be sealed on the head and face of the human body to create a clean air microenvironment, and existing studies have shown that wearing a mask will cause the following dust-contacting workers Hazards: 1) To achieve a good sealing effect between the mask and the head and face of the human body, it is necessary to rely on the head / ear straps to exert force on the mask to make it fasten to the facial skin. It is easy to cause facial contusion, induce folliculitis and other skin diseases; 2) The mask is an artificial creation of a miniature clean space, but there will inevitably be a dead space in this space (that is, the mask), which will cause the human body to exhale. CO2 and hot and humid air accumulate in this area, and then are inhaled by the human body for the second time, which induces discomfort such as headache, dizziness, and oppression, resulting in reduced work efficiency and endangering respiratory health; 3) The mask will affect the vision to a certain extent, making dust-exposed workers It is more difficult to see things in the dusty and unclear working environment, which affects work efficiency, even induces industrial accidents, and endangers the life safety of dust workers; 4) The mask will blur the wearer's pronunciation and hinder the normal communication between workers communication, it is easy to cause misinterpretation of instructions, reduce production efficiency, and even cause safety accidents

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