PROBLEM TO BE SOLVED: To provide a technique with which a fluid can be circulated while ensuring a flow rate.SOLUTION: A fluid circulation device includes: a pump chamber which performs a pumping action an inflow channel a fluid resistance element which suppresses or blocks a fluid flowing from the pump chamber to the inflow channel a discharge port a circulation channel that is a tubular channel in which the fluid is circulated from the discharge port to the inflow channel and a fluid storage section which is provided on the circulation channel, stores the fluid while the pumping action is stopped, and supplies the stored fluid as a part of the circulating fluid while the pumping action is performed. When a flow rate of the fluid circulating in the circulation channel during the pumping action is defined as Q, channel resistance per unit length of the circulation channel from the fluid storage section to an inflow channel side end portion is defined as R and a suction pressure that is a pressure for the pump chamber to suck the fluid is defined as Pv (Pv>0), the fluid storage section is provided at a position of a length h satisfying a predetermined relational expression from the inflow channel side end portion on the circulation channel.COPYRIGHT: (C)2013,JPO&INPIT【課題】流量を確保して流体を循環させることのできる技術を提供する。【解決手段】流体循環装置であって、ポンプ動作を行うポンプ室と、流入流路と、ポンプ室から流入流路へ向かう流体の流れを抑制または抑止する流体抵抗要素と、吐出口と、吐出口から流入流路へ流体が循環する管状の流路である循環流路と、循環流路上に設けられ、ポンプ動作の停止時に、流体を収容するとともに、ポンプ動作時に、収容している流体を循環する流体の一部として供給する流体収容部とを備え、ポンプ動作時における循環流路を循環する流体の流量をQとし、流体収容部から流入流路側端部にかけての循環流路の単位長さあたりの流路抵抗をRとし、ポンプ室が流体を吸入する圧力である吸入圧力をPv(Pv>0)とした場合に、流体収容部は、循環流路上における流入流路側の端部から所定の関係式を満たす長さhの位置に設けられている。【選択図】図5
