Inside air control system, refrigeration apparatus, and transport container

An inside air control system for performing an adjustment operation of adjusting a composition of inside air in a storage, comprising:

• a first adsorption vessel and a second adsorption vessel each having an adsorbent for adsorbing nitrogen and water;
• a first pump configured to supply treatment target air to the first adsorption vessel and the second adsorption vessel;
• a second pump which is an oilless pump configured to suck gas from the first adsorption vessel and the second adsorption vessel and supply the gas into the storage;
• a switching mechanism configured to switch a flow path of the treatment target air discharged by the first pump and a flow path of the gas sucked into the second pump;
• and
• a controller configured to control the first pump, the second pump, and the switching mechanism,
• wherein, in the adjustment operation, the controller is configured to control the switching mechanism to alternately perform a first action in which the first pump supplies the treatment target air to the first adsorption vessel and the second pump sucks the gas from the second adsorption vessel and a second action in which the first pump supplies the treatment target air to the second adsorption vessel and the second pump sucks the gas from the first adsorption vessel, and
• is further configured to, when a stop condition for stopping the adjustment operation is satisfied, the controller control the switching mechanism such that the second pump sucks the gas from one of the first adsorption vessel or the second adsorption vessel, to which the first pump supplies the treatment target air, when the stop condition is satisfied, and perform stop control for stopping the second pump after having operated the second pump for a predetermined first time.