Air flow equalizing curtain respirator

Abstract

The present application relates to a kind of air flow uniformity curtain breathing protective device, belong to the field of breathing protective device, the device includes transparent mask, baffle, foam strip, micro-prismatic flow uniformity air outlet device.Foam strip is connected in the upper portion of the transparent mask to facilitate contact with the human head.The micro-prismatic flow uniformity air outlet device is installed at the center of the foam strip and is in communication with the outside, and the airflow passing through is uniformly sent out through the specific structure inside, forming a stable air curtain in the human facial area.The baffle is connected to the lower portion of the transparent mask to maintain the positive pressure in the human facial area and prevent the pollutants from being sucked in by the negative pressure on the face.Compared with the traditional breathing protective device, the present application eliminates the influence of the suction effect, can form a uniform air curtain under high-speed airflow, has the characteristics of good airflow organization, low cost and easy to carry.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of respiratory protection devices, in particular to an air uniform flow curtain respiratory protection device. BACKGROUND

[0002] The air in the factory contains a lot of particulate matter, which is harmful to the health of indoor personnel. The conventional protective measures for this are only to wear a mask. The ordinary mask has high filtering efficiency for large particles, but it is difficult to efficiently filter fine particles in the air. In view of the pollutants in the air, the air curtain respiratory protection device can create a relatively safe human exposure environment in the environment with high concentration of surrounding pollutants, effectively prevent the inhalation of polluted gas, and has important significance for the respiratory safety of indoor personnel. The existing air curtain device has two problems of (1) high device cost (2) obvious air flow entrainment. In order to improve the above problems, the present application provides an air uniform flow curtain respiratory protection device. SUMMARY

[0003] The present application provides an air uniform flow curtain respiratory protection device, which can generate a stable air curtain in the human face area, prevent the surrounding polluted gas from being sucked by the negative pressure on the face, and provide protection for the respiratory safety of personnel, and has low cost and good air flow organization.

[0004] In order to achieve the above purpose, the examples of the present application adopt the following technical scheme:

[0005] An air uniform flow curtain respiratory protection device, characterized in that it comprises: a transparent mask, a baffle, a foam plastic strip, and a micro-prism uniform flow air outlet device; the foam plastic strip is connected to the upper part of the transparent mask to facilitate contact with the human head; the micro-prism uniform flow air outlet device is installed at the center of the foam plastic strip and is in communication with the outside; the baffle is connected to the lower part of the transparent mask to prevent the surrounding polluted gas from being sucked by the negative pressure on the face.

[0006] The micro-prism uniform flow air outlet device comprises an air inlet hole and a shell.

[0007] The shell is a trapezoidal body without a lower bottom surface, and the bottom is in communication with the outside. The upper bottom is 80mm long, the lower bottom is 120mm long, the width is 6mm, and the height is 15mm. A plurality of three-prism pyramids and cuboids with determined length and angle are installed inside the shell to change the speed and direction of the airflow passing through this structure.

[0008] A hollow cylinder without upper and lower surfaces is installed on the air inlet, and the diameter is 6mm.

[0009] The height of the three-prism pyramid is 6mm, and the bottom shape includes an isosceles triangle with a length of 1mm and an angle of 120°, an equilateral triangle with a length of 1mm and 1.5mm, an isosceles right triangle with a length of 1mm, and a right triangle with a length of ​

[0010] The cuboid height is 6mm, the width is 0.5mm, and the length is 5mm or 3mm. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 A schematic diagram of an air flow curtain breathing protection device provided by the present application.

[0012] Figure 2 A structural schematic diagram of a micro-prism flow uniformity air outlet device in an air flow curtain breathing protection device provided by the present application.

[0013] Figure 3 An A-A sectional view of a uniform air outlet device in an air flow curtain breathing protection device provided by the present application. DETAILED DESCRIPTION

[0014] The present application provides an air flow curtain breathing protection device, as shown in the drawings, which comprises a transparent mask, a baffle, a foam plastic strip, and a micro-prism flow uniformity air outlet device. Figure 1 The foam plastic strip is connected to the upper part of the transparent mask to facilitate contact with the human head; the micro-prism flow uniformity air outlet device is installed at the center of the foam plastic strip and is in communication with the outside world; and the baffle is connected to the lower part of the transparent mask to prevent the surrounding polluted gas from being sucked in under negative pressure.

[0015] The outlet pipe of the fan is connected to the air inlet of the micro-prism flow uniformity air outlet device.

[0016] The fan has a filtering device inside.

[0017] The maximum air volume of the fan is measured, and the measuring instrument used in the present application is TSI5300, and the maximum air volume is 45L / min.

[0018] The measuring instrument used in the present application is a TSI dust tester, and the measurement method refers to the “EN779 standard”, and the EN779 cycle sampling method is used.

[0019] The dummy wearing the air flow curtain breathing protection device is placed in a closed room environment, a short hose is used to connect the TSI dust tester and the dummy's nose, and the TSI dust tester is adjusted to zero.

[0020] After lighting a cigarette in the room for a period of time, the cigarette is extinguished, and the PM2.5 concentration in the room is allowed to diffuse uniformly.

[0021] The fan is turned on at maximum power, and an air curtain is formed in the area of the dummy's face.

[0022]

[0023] Table 1

[0024] As shown in Table 1, the PM2.5 concentration of the air sucked by the fan (upstream concentration) was measured for 7 groups, and the PM2.5 concentration of the air at the false nose (downstream concentration) was measured for 6 groups, 6 sub-filter efficiencies were measured, and the average filter efficiency was calculated.

[0025] The calculation method of the "i"th sub-filter efficiency is as follows:

[0026]

[0027] Where A i is the "i"th sub-filter efficiency;

[0028] E i is the average PM2.5 concentration of the air at the false nose (downstream), mg / m 3 .

[0029] N i is the average PM2.5 concentration of the air sucked by the fan (upstream), mg / m 3 .

[0030] The average filter efficiency is calculated by the following formula based on 6 sub-filter efficiencies (A1, A2...A6) measured for 13 times:

[0031] A = (A1 + A2 + A3 + A4 + A5 + A6) / 6.

[0032] A is the average filter efficiency.

[0033]

[0034] Table 2

[0035] As shown in Table 2, the measurement results of the present example are shown.

[0036] Since the number of samples is small, the sub-filter efficiency value is subject to t distribution, and the t distribution table is consulted.

[0037] After calculation, the 95% confidence interval of the present example is [0.1749, 0.3183].

[0038] Since the efficiency value A1 = 0.3533 is not within the confidence interval, it is excluded.

[0039] The average filter efficiency of the present example is 22.62% after calculation.

Claims

1. An air flow equalizing curtain respirator protection device characterized by, Comprise: Transparent mask (3), baffle (4), foam strip (5), flow equalization device (2) composed of five micro-prisms; the foam strip is connected to the upper part of the transparent mask to facilitate contact with the human head; the baffle is connected to the lower part of the transparent mask to prevent the surrounding contaminated gas from being sucked into the face under negative pressure; the flow equalization device composed of five micro-prisms is installed at the center of the foam strip and communicates with the outside, including an air inlet hole (1) and a shell, the shell is a trapezoidal body without a lower bottom surface, the bottom communicates with the outside, and a plurality of three pyramids and cuboids with determined length and angle are installed inside to change the speed and direction of airflow passing through this structure, the height of the three pyramids and cuboids is consistent with the width of the shell, both are 6mm, the bottom surface shape includes an isosceles triangle with a length of 1mm and a top angle of 120°, an equilateral triangle with a length of 1mm and 1.5mm, an isosceles right triangle with a length of 1mm, a right triangle with a length of 0.5mm, and a rectangle with a width of 0.5mm and a length of 5mm or 3mm.

2. The air flow equalizing curtain respirator of claim 1, wherein, The air inlet hole (1) is provided with a hollow cylinder without upper and lower surfaces, and the diameter is consistent with the width of the shell.

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