Two-stage jet device with flow guide structure

A two-stage jet device with a flow guide structure, comprising a cavity and a nozzle, wherein a first end of the cavity is provided with an outlet, a second end of the cavity is provided with a first gas inlet and a second gas inlet, and a mixing cavity in communication with the first gas inlet is formed in the cavity;

• the nozzle comprises a first-stage nozzle and a second-stage nozzle, the first-stage nozzle is located in the mixing cavity, and the first-stage nozzle is mounted at the second end of the cavity;
• the second-stage nozzle is mounted in the first-stage nozzle in an axially movable manner, an end of the second-stage nozzle is inserted into an inner cavity of the first-stage nozzle, a space between a shell of the second-stage nozzle and the inner cavity of the first-stage nozzle is a first jet channel, and a central hole in the second-stage nozzle is a second jet channel;
• by moving the second-stage nozzle, the second gas inlet is in communication with the first jet channel, or the second gas inlet is in communication with the first jet channel and the second jet channel;
• the two-stage jet device further comprising guide vanes, wherein the guide vanes are arranged in the first gas inlet and a suction cavity of the mixing cavity respectively, one of the guide vanes in the suction cavity is rotatable, and a control system controls a rotation angle of the one of the guide vanes in the suction cavity according to a position of the second-stage nozzle.