| 摘要 |
<p>A spraying device (10 or 10') comprising a spray tube (12 or 12') having a fluid entrance end connectable to a primary fluid source, and a fluid exit end upon which an additive fluid dispenser (14) is removably mounted. The additive fluid dispenser (14), having a chamber (70) for holding additive fluid and a mixing chamber (72), is coupled to the fluid exit end of the spray tube (12 or 12') in coaxial alignment with the direction of flow of primary fluid through the spray tube, causing opening of a valve mechanism (74) in the fluid dispenser. The additive fluid then is metered into the primary fluid flowing through the dispenser (14), by diverting a portion of the primary fluid flow against a movable piston (68) on a piston guide member-primary fluid conduit (64), to cause flow of the additive fluid through the valve mechanism (74). The spray tube (12, 12') may be of elongated telescoping construction (12), or of nontelescoping construction (12'), and may include a control valve (26, 26'). The additive fluid dispenser (14) preferably comes prefilled, is removably mounted on the spray tube (12 or 12') by a quick-releasable connection, and is disposable.</p> |
