PROBLEM TO BE SOLVED: To stably jet a fluid using a piezoelectric element.SOLUTION: This fluid jetting apparatus includes: a main piezoelectric element Po and a main control part 70 arranged inside a casing 10 a diaphragm 20 fixed in close contact with the main piezoelectric element Po a pressure chamber 30 formed by the diaphragm 20 and the casing 10 a fluid supply tube 60 supplying liquid into the pressure chamber 30 a passage tube 40 communicating with the pressure chamber 30 and having a polygonal cross-sectional shape with obtuse vertexes a jet port 50 connected to the terminal of the passage tube 40 a plurality of piezoelectric elements P1-P30 spirally arranged in a direction of the jet port 50 while abutting on the passage tube 40, and extending in a direction to intersect the direction of the jet port 50 and a control part 80 controlling the respective extension of the plurality of piezoelectric elements P1-P30 by applying voltage to the piezoelectric elements P1-P30, and sequentially extending the piezoelectric elements P1-P30 in the spiral direction from the one away from the jet port 50 toward the jet port 50 to generate a swirling flow that advances toward the jet port 50 within the passage tube 40.COPYRIGHT: (C)2013,JPO&INPIT【課題】圧電素子を用いて安定な流体噴射を行うこと。【解決手段】流体噴射装置は、筺体10の内部に配置される主圧電素子P0及び主制御部70と、主圧電素子P0に密着固定されるダイアフラム20と、ダイアフラム20と筺体10とによって構成される圧力室30と、圧力室30内に液体を供給する流体供給管60と、圧力室30に連通し各頂点が鈍角である多角形の断面形状を有する流路管40と、流路管40の終端に連結する噴射口50と、流路管40に接し、噴射口50方向に対し螺旋状に複数並び、噴射口50方向と交差する方向に伸長する圧電素子P1~P30と、複数の圧電素子P1~P30に電圧を印加して圧電素子P1~P30のそれぞれの伸長を制御し、噴射口50から離れたものから噴射口50の方向に向かって螺旋方向順に圧電素子P1~P30を順次伸長させ、流路管40内で噴射口50方向に進行する旋回流を生成させる制御部80と、を備える。【選択図】図1
