| 摘要 |
PURPOSE:To enlarge the use of a fluidic flowmeter, by setting the width of the slit-like jet nozzle in the fluidic flowmeter to 2-4mm. CONSTITUTION:A pair of first flow passage forming members 4a, 4b forming a pipeline contracted part 2 and a jet nozzle 3 are symmetrically arranged with respect to a pipe central axis P in a pipe 1 and a fluid is smoothly guided to the jet nozzle 3 by the action of the pipeline retracted part 2. A pair of partition walls 8a, 8b forming a pipeline enlarged part 5, a pair of control nozzles 6a, 6b and a pair of return flow passages 7a, 7b are symmetrically arranged with respect to the pipe center axis P. A flow rate measuring sensor 14 for detecting the change in pressure or flow rate caused by the change in the flow direction of the jet stream from the jet nozzle 3 is provided to one return flow passage 7a and a sine wave form signal is sent to a flow rate measuring device 15 from the sensor 14. The width W of the jet nozzle 3 is set to 2-4mm and the height H of the jet nozzle 3 is set so as to obtain a proper opening area corresponding to a flow rate measuring range. |
