PROBLEM TO BE SOLVED: To suppress the reduction in the absorptivity of an absorption agent in a gas supply device equipped with an air pump and an adsorbent.SOLUTION: A gas supply device (30) comprises an air pump (31) including absorption cylinders (34 and 35), and a first pump mechanism (31a) for compressing said absorption cylinders (34 and 35), and a second pump mechanism (31b). In said absorption cylinders (34 and 35), an adsorption operation for adsorbing the nitrogen component in compressed air and a desorption operation for desorbing the nitrogen component adsorbed in the adsorption agent in the air are alternately performed to perform a gas supply operation, in which the nitrogen concentrated air of a desired composition is produced and fed into a container (11). After the start of the air pump (31) and before the start of the gas supply operation, the pressurized air to flow in a pressure passage (42) for connecting the first pump mechanism (31a) and the absorption cylinders (34 and 35) is discharged to the outside.SELECTED DRAWING: Figure 7COPYRIGHT: (C)2017,JPO&INPIT【課題】エアポンプと吸着筒とを備えたガス供給装置において、吸着剤の吸着性能の低下を抑制する。【解決手段】吸着筒(34,35)と、該吸着筒(34,35)を加圧する第1ポンプ機構(31a)と減圧する第2ポンプ機構(31b)とを有するエアポンプ(31)とを備え、該吸着筒(34,35)において、加圧空気中の窒素成分を吸着剤に吸着させる吸着動作と空気中に吸着剤に吸着した窒素成分を脱着させる脱着動作とを交互に行って所望の組成の窒素濃縮空気を生成してコンテナ(11)の庫内に供給するガス供給動作を行うガス供給装置(30)において、エアポンプ(31)の起動後、ガス供給動作を開始する前に、第1ポンプ機構(31a)と吸着筒(34,35)とを繋ぐ加圧通路(42)を流れる加圧空気を外部へ排出する排出動作を行う。【選択図】図7
