高压氧舱恒湿平压系统的设计

Design of constant humidity and pressure regulating system for hyperbaric oxygen chamber

目的:设计一种高压氧舱恒湿平压系统,以消除舱内静电火花造成的危害,保证氧舱的安全运行。方法:该系统的硬件主要由加湿装置、除湿装置、平压装置、主控制器、压力传感器、温湿度传感器等组成。其中,加湿装置主体为经过特殊加工后的防爆过滤瓶;除湿装置采用工业级风机过滤单元(fan filter unit,FFU),由蒸发器、冷凝器、风轮3个部分组成;平压装置主要由电磁阀和减压管路组成;主控制器选用EX3G-C系列PLC触摸屏一体机,温湿度传感器选用NWSF-1AT型号温湿度传感器,压力传感器选用TXYS-G1K2HN3型变送器。系统的软件控制程序采用指令表语言编程,通过PID(proportional-integral-derivative)控制算法实现整体控制。结果:经过测试,该系统可使高压氧舱内相对湿度恒定在70%,使舱内极难产生静电。结论:该系统能够调节氧舱内的湿度、减少静电火花产生,保证舱内治疗的安全。

Objective To design a constant humidity and pressure regulating system to ensure the safety of the hyperbaric oxygen chamber by eliminating the hazards caused by electrostatic sparks in the chamber.Methods The system was mainly composed of a humidifying device,a dehumidifying device,a pressure regulating device,a main controller,pressure sensors and temperature and humidity sensors.The humidifying device used a specially processed explosion-proof filter bottle as its main body;the dehumidifying device was a industrial-grade fan filter unit(FFU),consisting of an evaporator,a condenser and a turbine;the pressure regulating device was made up of solenoid valves and decompression piping;an EX3G-C series PLC touch screen integrated machine was used as the main controller,and other components included NWSF-1AT temperature and humidity sensor and TXYS-G1K2HN3 pressure tansmitter(pressure sensor).The system had the control software programmed with the instruction table language and overall regulation with proportional-integral-devivative contrl algorithm.Results Trials proved that the system developed could keep the relative humidity in the hyperbaric chamber constant at 70%,making it extremely difficult to generate static electricity in the chamber.Conclusion The system developed regulates the humidity in the oxygen chamber,reduces electrostatic sparks and ensures the safety of treatment in the chamber.