气动自振荡回路的研究

Research on the Pneumatic Self-excited Oscillation Circuit

提出了采用一种自振荡回路为气动喷嘴提供间歇气流的方法。已由实验验证将间歇供气方式应用于气动喷嘴除杂较连续供气方式更节能,并且间歇气流的频率和占空比影响节能效果,存在一对频率和占空比使节能效果最优。为获得频率和占空比可调的间歇气流,提出了一种基于气控换向阀切换的自振荡回路,通过在气控阀先导口串联节流阀,调节节流阀开度,而控制向先导口充气时间,进而控制气控阀的换向时间,产生不同频率和占空比的间歇气流。通过对回路进行实验,实验结果和仿真结果基本吻合。

A method to provide intermittent flow for pneumatic nozzle based on pneumatic self-excited oscillation circuit was put forward. To obtain the intermittent flow that frequency and duty ratio can be adjusted, a pneumatic self-excited oscillation circuit based on pneumatic air-actuated direction valve was put forward. By connecting a throttle in series in the pilot orifice of air-actuated valve, adjusting the opening of throttle , controling the time of filling gas to the pilot orifice and the switching time of air-actuated valve, the intermittent flow with different frequency and duty ratio was obtained. The results of computer simulation are in agreement with the experimental results.