现行苏教版普通高中课程标准实验教科书《实验化学》中安排了“硝酸钾晶体的制备”这一实验,在该实验中需要使用减压抽滤装置,而目前很多学校并没有抽气泵,实验条件受到限制,导致该实验不能顺利进行。因此,笔者自制了一套简易减压抽滤装置,使用单向空气阀控制气体的进出,这在整套装置中起到关键作用。一、实验材料500 mL抽滤瓶一个、布氏漏斗一个、50 mL注射器 The current version of the experimental version of the general high school curriculum standard experimental textbook “Experimental Chemistry” arranged “potassium nitrate crystal preparation ” experiment, in this experiment need to use vacuum suction filtration device, and many schools do not currently have suction pump , The experimental conditions are limited, resulting in the experiment can not be carried out smoothly. Therefore, I created a simple vacuum suction device, the use of one-way air valve to control the access of gas, which play a key role in the entire device. First, the experimental material 500 mL suction filter bottle, a Buchner funnel, 50 mL syringe