Teng Guangping, Shi Guoqing, Zhu Jintuo, Zhao Caijun
College of Safety Engineering, School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China.
School of Safety and Management Engineering, Hunan Institute of Technology, Hengyang, 421002, China.
Sci Rep. 2023 Jul 27;13(1):12219. doi: 10.1038/s41598-023-39411-z.
In the hope of reducing the air supply flow of the powered air-purifying respirator (PAPR) and extending the service life of the filter, a breath-following powered air-purifying respirator (BF-PAPR) that can dynamically adjust the air supply flow according to the breathing flow is proposed. The BF-PAPR changes the air supply flow by adjusting the speed of the variable-frequency centrifugal fan according to the air velocity at the half mask outlet (v) monitored by the modular wind speed transmitter. In the study, the air supply flow adjustment model of the BF-PAPR is developed. It is found that the filtration resistance barely influences v. In addition, under the same mean inhalation flow, the minimum outlet air velocity increases first and then decreases with the increase of the duty cycle variation coefficient (λ), while the maximum outlet air velocity decreases first and then increases. Moreover, the minimum air supply flow of the BF-PAPR is achieved when the standard value of the air velocity is 13.4 m/s and the value of λ is 1. The BF-PAPR can reduce the air supply flow by 6.5%-8.6% and the energy consumption by approximately 20% compared with the PAPR, which is beneficial for reducing the usage cost and extending the continuous working time.
为了降低电动空气净化呼吸器（PAPR）的供气流量并延长过滤器的使用寿命，提出了一种能够根据呼吸流量动态调节供气流量的随呼吸电动空气净化呼吸器（BF-PAPR）。BF-PAPR通过根据模块化风速变送器监测的半面罩出口处的空气流速（v）来调节变频离心风扇的速度，从而改变供气流量。在该研究中，建立了BF-PAPR的供气流量调节模型。研究发现，过滤阻力对v几乎没有影响。此外，在相同的平均吸气流量下，最小出口空气流速随着占空比变化系数（λ）的增加先增大后减小，而最大出口空气流速则先减小后增大。而且，当空气流速标准值为13.4 m/s且λ值为1时，可实现BF-PAPR的最小供气流量。与PAPR相比，BF-PAPR可将供气流量降低6.5%-8.6%，能耗降低约20%，这有利于降低使用成本并延长连续工作时间。
