【作者】 李虎； 汪开英；

【Author】 Li Hu,Wang Kaiying(School of Biosystems Engineering and Food Science,Zhejiang University,Hangzhou,310058)

【机构】 浙江大学生物系统工程与食品科学学院；

【摘要】 本研究旨在研制一种新的基于国标三点式比较臭袋法的恶臭动态嗅觉仪。针对质量流量控制器在恶臭动态稀释应用中存在流量控制准确性易受气体成分变化的影响、器件内壁易受恶臭样品污染等问题,提出了利用伺服电机结合精密针阀节流调速的方法实现恶臭样品的定比稀释,同时提出配套的仪器校准方法。该恶臭动态嗅辨仪利用文丘里混合技术,压缩空气经过滤后同时用作抽吸样品的动力耗气和无臭空气。利用电机转动改变针阀节流口大小来调节流量,使用精密稳压阀实现针阀进气口压力恒定,同时使针阀进出口压力比大于1.893,将下游器件带来的背压影响和高浓度恶臭对器件的污染尽量降低,保正了流量的稳定性。更多还原

【Abstract】 The aim of this work is establish a new Dynamic Dilution olfactometer based on triangle odor bag method.Needle valves were used to control the flow instead of mass flow controller which most dynamic olfactometers used at present.The mass flow controller is inaccurate if the sample changes and it is vulnerable to be polluted by the high concentration samples.In this study,the servo motor was used to adjust the throttle of the need valve.To ensure the accurate of the flow,a precision regulator valve was used to keep the inlet pressure of the needle valve from the downstream effects.The pressure ratio between the inlet and the outlet was more than 1.893,then the flow kept constant unless the throttle of the need valve changed.更多还原