| 摘要 |
A nozzle unit for the automatic injection of a treatment fluid into a cavity, comprising a translatable spray nozzle (1) which is secured to a piston rod (4) of a pneumatic cylinder assembly (3), means (16, 22) for feeding treatment fluid and means (21, 23) for feeding gas under pressure to a mixing assembly (18) in order to mix the treatment fluid and the gas and to expel the resulting mixture. Novel in the invention is that the piston device (8) and the piston rod (4) in the cylinder assembly (3) present through going, concentrically oriented bores (9, 18-20), the piston rod bore (18-20) being aligned with the bore (27) in the spray nozzle (1), a connecting nipple (16) is disposed adjacent the rear cylinder end wall (7) for feeding treatment fluid to a stock conduit (22) secured to this end wall which is concentrically disposed in the cylinder assembly (3) and inserts into the bores (9, 18-20) in the piston device (8) and the piston rod (4), and which, in the projecting state of the nozzle unit, is arranged, together with a conduit means (23) for feeding mixing gas, to discharge at the inner end of the mixing assembly (18). <IMAGE> |
