Design and Development of Helium Inspection System for High-Efficiency Gas Generator

Aiming at the contradiction between the detection accuracy of the helium inspection station and the working cycle in the automatic assembly production line of the automobile airbag gas generator,combined with the advantages of the vacuum box helium inspection method,a high-efficiency helium inspection system for the gas generator is designed.Based on the characteristics of the generator structure and the working principle of helium inspection,theoretical calculations and pneumatic control system design were carried out.In this system,large leak inspection,helium-free solid parts inspection and standard parts online inspection experiments were carried out.The experimental results show that the detection pressure of the system's large-leakage error prevention parts is greater than 180 Pa,and the detection pressure of qualified products is less than 60 Pa.The helium detection leak rate of solid parts without helium filling is on the order of 10^-10Pa·m³/s.The helium detection leak rate for online products is less than 2.7×10^-7Pa·m³/s,and the helium detection cycle is less than 8 s.The detection function,process flow and error prevention of the helium detection system can meet the requirements of the generator automation production line.