| 摘要 |
<p>A spraying head arrangement in which the spray forming part (40), the liquid feed (70) and the drive to rotate the spray forming part (60) are all behind the region from which the spray emerges. This is achieved by feeding the liquid through the spray forming means (40), conveniently through the smaller end of a conical spray forming cup (41) supported by a bearing (30) at this smaller end. Variable ratio belt drive (62) can be applied at the smaller end. Liquid is distributed inside the cup (41) by a plate (45). Electrostatic charge can be applied to the spray. A point electrode (52), or electrodes near the axis of the cup (41) cooperates with the surface electrode (55) on the distributor plate (45) and another surface electrode (54) on the inside of the cup (41) to charge the spray when the point electrode (52) is energised, conveniently through an insulated conductor arranged near the axis and along the liquid feed path (22). A peristaltic pump (70) can be arranged to control the liquid feed through a simple push-in connection. Jets and other narrow passages are thus avoided. The pump speed can be varied to control the spray rate.</p> |
