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目的研究正压送风过滤式防护装备的过滤效率和送风量对其微环境的影响。方法采用模拟病毒(大肠杆菌噬菌体f2)雾化生物气溶胶进行高效空气过滤器过滤效率的测定;在夏季进行4kmh行走速度的模拟作业,考察不同送风量对装备微环境内的氧、二氧化碳含量和温度、湿度的影响;在3家定点医院进行临床试用。结果高效空气过滤器可滤除空气中99.99%模拟病毒。送风量在75～125Lmin范围时,防护装备微环境内氧含量为19.6%～20.1%(健康人生理安全限值要求不低于14.6%)、二氧化碳含量为0.43%～0.57%(健康人生理安全限值要求不高于1.0%);温度为32.0℃～32.2℃、湿度为49.7%～59.4%(健康人生理安全限值是温度31℃、湿度85%或温度38℃、湿度50%)。各项指标均能够满足健康人正常工作负荷时的生理要求。经试用,临床医护人员感觉整体防护性良好,不憋气,视窗不起雾,无医护人员感染。结论该医用防护装备的微环境能满足健康人正常工作负荷的生理需求。
Objective To study the effect of filtration efficiency and air supply on the micro-environment of positive-pressure air-filtration protective equipment. Methods The aerosol of mock virus (Escherichia coli bacteriophage f2) was used to measure the filtration efficiency of high efficiency air filter. In the summer, the simulation work of walking speed of 4kmh was carried out to investigate the effect of different air supply on oxygen and carbon dioxide And temperature and humidity; in three designated hospitals for clinical trials. Results High efficiency air filters filter out 99.99% of mock viruses in the air. Air supply in the range of 75 ~ 125Lmin, protective equipment micro-environment oxygen content of 19.6% to 20.1% (physical health and safety requirements of not less than 14.6%), carbon dioxide content of 0.43% ~ 0.57% (healthy human physiology The safety limit is not higher than 1.0%); the temperature is 32.0 ℃ ~ 32.2 ℃ and the humidity is 49.7% ~ 59.4% (Physiological and safety limits for healthy people are 31 ℃, 85% humidity or 38 ℃, 50% humidity) . The indicators are able to meet the physiological requirements of healthy people at normal workload. After trial, clinical staff feel good overall protective, not suffocating, the window is not fog, no medical staff infection. Conclusion The microenvironment of the medical protective equipment can meet the physiological demands of normal working load of healthy people.