| 摘要 |
In an ejector, in which the internal diameter of the mixing chamber (5) may be changed with a view to adjustment to various working conditions, such as suction (as shown) or pumping, said internal diameter is changed by means of a sleeve-shaped insertion (8) displaceable from the position shown, corresponding to suction, to a position (not shown) in a space (11) about the nozzle tube (12). Hereby is achieved that the switching between two working positions may be carried out by means considerably more simple than the previously known means, e.g. constituted by a flexible wall of rubber or the like about the mixing chamber, the diameter of which is changed by exerting pressure on the outside of the wall. |
