Abstract
Jet vacuum ejectors currently used have a defect of large air consumption due to the need of continuous and constant air supply. To solve this problem, a novel technical structure of the jet vacuum ejector with flow self-regulation by an adjustable cone has been investigated. In this paper, the structure, key technologies and experiment of this new jet vacuum ejector are introduced. In the new ejector, by means of the adjustable cone, the effective cross section at the jet nozzle throat could be adjusted so as to realize the reduction of air supply and achieve energy saving. For this, a key technology for the new structure called chamber-separating pneumatic-magnetic driving is studied, . in which a vacuum detecting-differential pressure actuating and non-contacting pneumatic-magnetic driving with a coaxial magnetic ringaxial structure are implemented. Experimental results for the flow self-regulated vacuum ejector have shown that the vacuum response time and maximum vacuum of new ejector are almost equivalent to the constant-area vacuum ejectors with the relative parameters, but the air consumption could save about 14.8%.
