PROBLEM TO BE SOLVED: To provide a fluid injection device capable of stably injecting a fluid immediately after starting.SOLUTION: The fluid injection device 1 is provided with a pulsating flow generator 20 which changes the volume of a fluid chamber 80 by means of a piezoelectric element 30 and a diaphragm 40 to inject the fluid in pulses through a fluid injection opening 96, a pump 10 for supplying the fluid to the pulsating flow generator 20, a flexible tube 4 for communicating the pulsating flow generator 20 with the pump 10, a drive controller 15 for controlling the drives of the pulsating flow generator 20 and the pump 10, wherein the fluid is supplied from the pump 10 at an increased flow rate relative to a constant flow rate almost at the same time as the pulsating flow generator 20 is started within an increased flow rate designation time period, and the constant flow rate is restored after the increased flow rate designation time period has passed, whereby the reduction in the supplied amount of the fluid to the pulsating flow generator 20 can be inhibited to stably inject the fluid in pulses at a high speed immediately after the pulsating flow generator 20 has started, even if there is the expansion of the tube 4 caused by the increase in the flow path resistance in the pulsating flow generator 20.COPYRIGHT: (C)2011,JPO&INPIT【課題】起動直後から安定した流体噴射ができる流体噴射装置を提供する。【解決手段】流体噴射装置1は、流体室80の容積を圧電素子30及びダイアフラム40により変化させて流体噴射開口部96から液体をパルス状に噴射する脈流発生部20と、脈流発生部20に液体を供給するポンプ10と、脈流発生部20と前記ポンプ10とを連通する柔軟性を有するチューブ4と、脈流発生部20と前記ポンプ10の駆動制御を行う駆動制御部15と、が備えられ、脈流発生部20を起動させるとほぼ同時にポンプ10から定常流量に対して増加流量を増加流量指定時間の範囲内に供給し、増加流量指定時間経過後、定常流量に復帰させる。このことにより、脈流発生部20内の流路抵抗の上昇に起因するチューブ4の膨張がある場合においても、脈流発生部20への流体供給量の減少を抑制し、脈流発生部20の起動直後から液体を安定してパルス状に高速噴射させることができる。【選択図】図1
