Vacuum generator is an important component of vacuum pressure as power source and is widely used.Vacuum degree is an important index to measure the working performance of vacuum generator.The structure parameters of Laval tube will affect the vacuum degree of vacuum generator.In order to find out the influence of Laval tube structure parameters on the vacuum degree of vacuum generator,the three structural parameters of pipe diameter,outlet diameter and throat distance were calculated by the method of Sokoloff theory,and the influence rule of them on the vacuum degree of vacuum generator was analyzed.After analysis,the influence of pipe diameter and outlet diameter on vacuum degree is significant,but the influence of throat distance on vacuum degree is not significant.The best structural parameters are 8.0 mm diameter of the throat,17.0 mm diameter of the outlet and 10.0 mm distance between the throat and mouth.
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