The invention provides a steam ejector. The steam ejector is composed of three parts of a diffuser
pipe, an ejecting
nozzle and a suction chamber; the diffuser
pipe structurally comprises an exit section expanded gradually, a
larynx part with uniform section and an entrance section reduced gradually; the ejecting
nozzle structurally comprises an ejecting
nozzle outlet, an ejecting nozzle
larynx part, an ejecting nozzle steam inlet
pipe, an ejecting nozzle spindle, a sleeve, a driving steam inlet, an end thread, a hand wheel and a steam inlet pipe thread; the suction chamber structurally comprises a suction chamber shell and a steam inlet; the outlet of the suction chamber shell is connected with the entrance section of the diffuser pipe, the other end of the entrance section of the diffuser pipe is connected with the
larynx part of the diffuser pipe, and the other end of the larynx part is connected with the exit section of the diffuser pipe; one end of the ejecting nozzle spindle is the hand wheel, the other end of the ejecting nozzle spindle is in a
circular cone shape, the top end of the
circular cone shape points to the ejecting nozzle larynx part located on the end part of thesteam inlet pipe, two sections of threads are located on the ejecting nozzle spindle, the thread close to the hand wheel is matched with the end thread on the sleeve, the thread in the middle is matched with the steam inlet thread, and the steam inlet is slidably attached to the inner wall of the sleeve.