潮气量检测设备等温容器研究

Isothermal chamber for tidal volume testing equipment

目的提出一种呼吸机潮气量检测设备的等温容器制作方法。方法通过向一定体积的密闭容器内注入气体,测量容器内部压强与温度的变化,依据理想气体状态方程精确计算注入气体的体积。为了使注入气体时容器内部恒温,向容器内部填充细铜丝,以吸收因空气压缩而产生的热量。结果细铜丝填充量至少为300 g/L、注入气体在100 m L以内时,可认为1 L容器内部达到等温状态。将实验系统接入呼吸机,比较测量潮气量值与设定潮气量值,实验误差在2%以内,证明实验的精确性。结论建立用于检测呼吸机潮气量等温容器模型,可以精确检测呼吸机的通气量,为呼吸机通气量的出厂检测提供理论依据和数据支持,为临床呼吸机的通气性能检修提供更多选择。

Objective To propose a design method of isothermal chamber for tidal volume testing equipment. Methods According to the State Equation of Ideal Gas, the gas volume was accurately calculated and injected into an airtight chamber, and then the pressure and temperature changes in the chamber were measured. To keep constant temperature, the fine copper wire was padded into the chamber to absorb the heat produced by the gas compressed during the injection. Results For the chamber of 1 L, 300 g/L copper should be filled at least and with not more than 100 mL gas to keep the temperature inside the chamber isothermal. The experiment system was then connected with ventilator to compare the measured tidal volume and given tidal volume. The results showed that the experimental error was within 2%, which proved the accuracy of this testing equipment. Conclu- sions The establishment of the physical model of isothermal chambers can accurately detect the tidal volume of ventilator, which provides a theoretical basis and data support for factory inspection and supply more choices for ventilator maintenance in clinic.