Study of protective properties of half-masks respirators used by miners

Holinko, Vasyl; Cheberiachko, Serhii; Yavorska, Olena; Radchuk, Dmytro

doi:10.15407/mining10.04.029

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…However, it does not mean that Modification 2 should be rejected. It is believed that it will provide for tight sealing when being used by workers with small face dimensions [17]. Similar half-mask designs are used by well-known manufacturers (for example, Advantage 200 Respirator).…”

Section: Discussionmentioning

confidence: 99%

Designing the half-masks of filter respirators for workers of mining enterprises

et al. 2019

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The purpose of paper is to develop an algorithm for designing the half-masks of air-purifying respirators and assessment of their safety factor of insulation. To create a 3D model of a head, two-parameter NIOSH tables (National Institute for Occupational Safety and Health) were used. The model drawings were made with the use of Solid works software package. Differential geometrical method based on applying the moving Frénet trihedral was used to design half-masks. Two designs of the respirator half-mask were developed based on the averaged length and width of face (Modification 1), and length of face and lips (Modification 2). As a result of modeling test, the area and perimeter of the mask contact line have been defined. The safety factor of half-mask insulation was calculated theoretically. It has been established that the safety factor of Modification 1 half-mask is 2.5 times higher.

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Section: Discussionmentioning

confidence: 99%

Designing the half-masks of filter respirators for workers of mining enterprises

et al. 2019

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“…In previous research [19][20][21][22][23], the results of mathematical modelling were presented, in which the filter is represented by the calculation scheme of interconnected channels, where the air motion occurs between two parallel walls. This did not take into account the curvature of the channels, which, in terms of design, is conditioned by the presence of protrusions of individual parts of the fibres of the filtering layer, which results in a decrease in the size of the channels.…”

Section: Introductionmentioning

confidence: 99%

“…The solution to this problem was based on the Euler hydrodynamic equations, taking into account fictitious mass forces of resistance by Zhukovsky. Given that, during respiration, the air movement through the filter can be described by the harmonic law, the following formula [21] was obtained for the pressure drop:…”

Section: Introductionmentioning

confidence: 99%

Research on Regularities of Cyclic Air Motion through a Respirator Filter

et al. 2021

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In this paper, a solution to the problem of the change in the pressure drop in a respirator filter during cyclic air motion is suggested since the current theory of filtering is based on steady-flow processes. The theoretical dependence of the pressure drop in the respirator filter on air flow rate is determined, which is represented by the harmonic law, which characterizes the human respiration process during physical work. For the calculation, a filter model was used, which is represented by a system of parallel isolated cylinders with a length equal to the total length of the filter fibres surrounded by porous shells formed by a viscous air flow field, with a size determined by the equal velocities of the radial component of air flow and undisturbed flows. The flow-around process in the proposed model of air flow through the respirator filter is described by the Brinkman equation, which served to establish the total air flow resistance in the proposed system under conditions of velocity proportionality. It consists of two parts: the first characterizes the frictional resistance of the air flow against the surface of the cylinder, which imitates the filter fibre; the second—the inertial part—characterizes the frequency of pulsations of respiratory movements during physical performance. The divergence of the analytical results and experimental studies is no more than 20%, which allows the use of the established dependence to estimate the change in pressure drop in a respirator filter made of filter material “Elephlen” when the user carries out different physical activities. This allows the period of effective protective action of respirators with different cycles of respiration during physical activities to be specified, which is a very serious problem that is not currently regulated in health and safety regulations, and it also allows the prediction of the protective action of filters and respiratory protection in general.

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“…First, the outer filtering layer was replaced. Secondly, the area of the half mask obturator was extended with an effective cellulose material [14]. Thirdly, the respirator fastening system was changed [15].…”

Section: Introductionmentioning

confidence: 99%

Development of a Dust Respirator by Improving the Half Mask Frame Design

Bazaluk

Cheberiachko

et al. 2021

IJERPH

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Protective efficiency of filtering dust respirators depends on the properties of filter materials from which filters are made and the structure of a half mask frame, which influences how tightly the respirator fits the face. The conducted studies on the “Lepestok 40” dust respirator revealed a large air leakage through the gaps occurring along the obturation strip. Therefore, the purpose of the study is to develop a dust respirator to provide high level of protection and usability by improving the half mask frame design. A scheme for designing a dust respirator: analysis of operating conditions for the dust respirator; facial anthropometric measurements of potential users; designing a 3D model of half mask frame; laboratory testing of the protective properties of the product. A distinctive feature of this approach is considering the facial anthropometric dimensions of employees of a particular enterprise, standard sizes formation of 3D facial models, which is the basis for designing a half mask frame for dust respirator. A new half mask frame design for dust respirator with a variable geometry of fitting to the face surface has been developed, due to special attachment points that allow changing its size according to the anthropometric dimensions of user’s face.

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Study of protective properties of half-masks respirators used by miners

Cited by 4 publications

References 5 publications

Designing the half-masks of filter respirators for workers of mining enterprises

Designing the half-masks of filter respirators for workers of mining enterprises

Research on Regularities of Cyclic Air Motion through a Respirator Filter

Development of a Dust Respirator by Improving the Half Mask Frame Design

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