| 摘要 |
1. Working nozzle of a jet pump, in the form of a conical thin-walled threaded sleeve with a central round outlet hole between its outlet and the perimeter of an immobile conical guide pin which is placed inside the sleeve, characterized in that it has the shape of a cylindrical sleeve (1), whose inlet has a thread (2) cut on the outside and whose outlet section is shaped as a thin-walled acute-angled cone with a guide pin (3) which is an integrated part mounted close to the outlet and which has the form of a thin-walled acute-angled cone with its vertex rounded in a circular arc, situated in the axis of symmetry of the sleeve (1) and having on part of its perimeter, in particular 1/4 of the perimeter, a transverse thin-walled rib (4), whose projection in the plane of the outlet of the nozzle supplements the perimeter of the working outlet of the nozzle, which is an open ring, in particular a ring making 3/4 of the circumference of a circle, where the flat end part (4.1) of the rib (4) makes with the axis of symmetry of the nozzle a preferably obtuse angle (α) and is connected to the side walls (4.2) by arcs with a radius preferably greater than the thickness (g) of the wall of the end part (4.1), which is so situated that its abrasive inlet edge is bent in an arc with at least the same radius (r) and is placed preferably on the generator of the cylindrical sleeve (1).<IMAGE>
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