PROBLEM TO BE SOLVED: To improve heat exchange efficiency and to facilitate washing and sterilization of a fluid flow passage and confirmation of the state thereof.SOLUTION: First flow passage formation members (11, 13) of a heat exchanger (1) gradually decrease a diameter of an inner peripheral surface of a container shape from an upper part to a lower part, a first flow passage (134) is formed in a peripheral wall part, and a spiral second flow passage (114) is formed between the inner peripheral surface of the first flow passage formation members (11, 13) and an outer peripheral surface of a second flow passage formation member (12).COPYRIGHT: (C)2015,JPO&INPIT【課題】熱交換効率を良好にし、流体流路の洗浄、消毒および状態確認を容易にする。【解決手段】熱交換器(1)の第1の流路形成部材(11,13)は、容器形状の内周面の径が上部から下部に向かって漸次小さくなり、かつ第1流路(134)が周壁部内に形成され、第1の流路形成部材(11,13)の内周面と流路形成第2部材(12)の外周面との間に螺旋状の第2流路(114)が形成される。【選択図】図4
