摘要:
An oscillating or pulsing fluid stream, or flow 18, 132, 300, is produced from a flow of pressurized air by fluidic apparatus 10, 100, 130, 180, 220 in a device 250 configured for use in surface cleaning, sweeping, lawn care applications, and the like. Converging inlet chamber walls 20, 22, define a tapered internal lumen having a smooth narrowing profile is configured to generate at a power nozzle 44 a high velocity stream with minimal pressure drop. Downstream of the power nozzle, first and second control ports CP1, CP2 are in fluid communication with the high velocity stream 46 and with each other via an inertance loop 72 having a lumen of selected cross sectional area and length. The varying air flow is directed through an outlet chamber 14, 134 shaped to produce an oscillating flow 18 or a pulsating flow 132.
摘要:
A molded fluidic device having a power nozzle with a width W and a coupling passage coupling a source of fluid to said power nozzle. The coupling passage has a planar enlargement and a plurality of posts spaced across the enlargement, the spacing S between each post being less than the width of the power nozzle with the sum of spacing S being greater than the width W.
摘要:
A molded fluidic device having a power nozzle with a width W and a coupling passage coupling a source of fluid to said power nozzle. The coupling passage has a planar enlargement and a plurality of posts spaced across the enlargement, the spacing S between each post being less than the width of the power nozzle with the sum of spacing S being greater than the width W.