介质阻挡放电检测塑料容器的密封性能

Sealing Performance of Plastics Vessel under Dielectric Barrier Discharge

利用介质阻挡放电检测在食品和医疗行业中广泛使用的塑料容器密封性能是一种可检测微小渗漏的非接触式新型检漏方法,而高压放电电源是该技术的关键。为了解高压放电电源性能和参数变化的规律,建立了高频高压电源和负载的等效电路模型并进行了仿真和放电实验研究。研究结果表明,当置于2个高压电极中的塑料容器出现密封不良时,在2个电极之间产生比较强的介质阻挡放电,使高频高压电源的谐振电路偏离其谐振点,高压电压和谐振电流都会减小,放电电流会增大。因此,监测介质阻挡放电电源的谐振回路中的相关电路参数的变化情况,能够可靠地实现塑料容器的密封性能的检测。

Using dielectric barrier discharge in the detection of the sealing performance of the plastic vessels is a new non-contact leakage detection method. A simulation was carried out based on an equivalent circuit model of the high voltage power supply and its load, and a dielectric barrier discharge experiment was also carried out by validation of the leakage detection method. The results show that, the sealing fault of the plastic vessels occurs, and the intensity of the discharge is promoted. Meanwhile, because of the detuning resonance in the resonant circuit of the high voltage power supply, the high voltage and resonant current are decreased, and discharge current is increased. Consequently, the detection of the sealing performance of the plastic vessels can be realized by monitoring the variation of the resonant parameters of the resonant tank.