PROBLEM TO BE SOLVED: To provide a microbubble generator capable of reliably generating a large number of fine air bubbles with uniform size at a low cost.SOLUTION: The microbubble generator includes: a case body which communicates an inflow opening of liquid to an outflow opening of the liquid with a main path a squeezing part disposed on the middle of the main path and a gas mixing means formed on the squeezing part. The gas mixing means includes: a gas introducing hole which penetrates the case body in the thickness direction and is communicated with the main path an annular slit which is arranged on the squeezing part, is communicated with the gas introduction hole and is opened to the main path and an annular space which is communicated with the gas introduction hole and is communicated with the annular slit. An oblique introduction means for introducing gas from an annular space, that is, the gas from the annular slit obliquely toward the downstream direction of the flow of liquid in the main path is disposed and, thereby, the gas is obliquely introduced from the outer circumferential side of the main path in the downstream direction of the flow of the liquid.COPYRIGHT: (C)2012,JPO&INPIT【課題】 低コストにより、均一大きさで多くの微細気泡を確実に発生させるマイクロバブル発生器を提供する。【解決手段】 マイクロバブル発生器は、液体の流入開口と液体の流出開口とを主通路で連通させたケース体と、主通路の中間に設けた絞り部と、絞り部に形成された気体混合手段と、を含む。気体混合手段は、ケース体を肉厚方向に貫通して主通路に連通する気体導入孔と、絞り部に配置され気体導入孔に連通するとともに主通路に開放する環状スリットと、気体導入孔に連通するとともに環状スリットに連通する環状空間と、を備える。環状空間からの気体であって、環状スリットから主通路の液体の流れ下流方向に斜めに向けて気体を導入させる斜め導入手段を設けて、主通路の外周側から液体の流れ下流方向に斜めに向けて気体を導入させる。【選択図】図1
