| 摘要 |
1500060 Nozzles ITALSIDER SpA 30 July 1975 [8 Aug 1974] 31873/75 Heading B2F Apparatus for producing a stream of gas or vapour, for example for spraying a metal strip being withdrawn from a bath of molten metal with a jet of steam or air, comprises an elongated nozzle formed by two lips 2, 3 inclined towards each other, a pair of sliding shutters 5, one of which is shown in Fig. 5, for adjusting the nozzle length, and a conduit 7 for supplying gas or vapour to an outlet at the inner end of each shutter immediately adjacent the unshielded part of the nozzle outlet. The lips 2, 3 are connected to a manifold 1; lip 2 is rigid but lip 3 is resilient owing to the presence of a slot 4, and the position of this lip can be adjusted to vary the width of the nozzle outlet. The conduit 7, which is preferably elongated in the direction of the manifold axis, is connected between a chamber 6 in the shutter and a sleeve 8 sliding inside a second conduit 9 parallel to the nozzle lips, gas or vapour being fed into this second conduit by feeding means shown in Fig. 4. The transverse profile of the shutter matches the inner profile of the cross-section of the nozzle and the rear part of the shutter engages in a groove 10 in the manifold. The length of the nozzle may be varied by moving the conduits 7 and associated shutters manually or automatically by control means sensing the width of the strip to be coated. In use, gas or vapour is fed under pressure to the central area of the manifold 1, and gas or vapour is fed through conduit 7 at a pressure higher than that of the gas or vapour fed to the manifold, thereby producing streams of gas or vapour at higher pressure at the ends of the nozzle. |
