PROBLEM TO BE SOLVED: To provide a hydroponic apparatus capable of dissolving a sufficient amount of oxygen without requiring external power.SOLUTION: According to the present invention, a hydroponic culture apparatus 1 comprises a water storage tank 2, a mixing section 3, a hydroponic tank 5, and a circulation pump 7. The mixing section 3 comprises a cylindrical member 31, at least one substantially conical projection member 33 having a bottom surface with a diameter smaller than the inner diameter of the cylindrical member and a side surface, and a gas introduction section 37 for introducing a gas from the outside of the cylindrical member. A part of a side surface 333 of the substantially conical projection member 33 is attached inside the cylindrical member 31 to dispose a bottom surface 331 on the downstream side in the axial direction D1 of the cylindrical member 31. The gas introduction section 37 is provided in the cylindrical member 31 in the vicinity of the bottom surface of the substantially conical projection member 33. Thus, the air sucked through the gas introduction section 37 can be mixed with a fluid passed through the gap between the cylindrical member 31 and the substantially conical projection member 33.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】外部の動力を必要とすることなく十分な量の酸素を溶存させることが可能な水耕栽培装置の提供。【解決手段】水耕栽培装置1は、貯水タンク2と、混合部3と、水耕栽培槽5と、循環ポンプ7と、を備える。混合部3は、円筒部材31と、円筒部材の内径よりも小さい径の底面と側面とを有する少なくとも1つの略円錐状突起部材33と、円筒部材の外部から気体を導入する気体導入部37と、を有する。円筒部材31の内部には、底面331が円筒部材31の軸方向D1下流側に位置するように略円錐状突起部材33の側面333の一部が着設されており、略円錐状突起部材33の底面近傍において円筒部材31に気体導入部37が設けられており、円筒部材31と略円錐状突起部材33との隙間を通過した流体に気体導入部37を介して吸引される空気が混合されるように構成されている。【選択図】図2
