| 摘要 |
PURPOSE:To accurately measure flow rate by means of the waveform signal of a presence sensor regardless of the size of flow rates, by respectively making a pair of discharge paths to communicate with the entrances of both returning flow paths and providing the pressure sensor for flow rate measurement provided between the discharge paths. CONSTITUTION:A partition wall 11 which forms a pair of discharge paths 10a and 10b together with partition walls 9a and 9b is provided under a condition where the downstream side of a conduit expanded part 5 is blocked and entrances of both discharge paths 10a and 10b are respectively made to communicate with entrances of both returning flow paths 7a and 7b. When injection of a fluid is started from a injection nozzle 3, the injected fluid flows along one side partition wall 8a by a Coanda effect. Therefore, large fluid energy is given to a control nozzle 6a provided on the partition wall 8a side from the returning flow path 7a and the fluid tends to flow along the opposite side partition wall 8b. This fluid type flowmeter is constituted in such a condition that the fluid from the injection nozzle 3 alternately flows along the opposite partition walls 8a and 8b in this way and the flowing direction changes in the shorter period the more the quantity of the fluid increases and in a quantitatively correlated condition. A pressure change caused by a change in flowing direction is detected by a pressure sensor 14. |
