Patent ID: 10168092

Abstract:
Disclosed herein is a container refrigeration apparatus (10) for cooling air in a container (11). The container refrigeration apparatus (10) includes: a gas supply device (30) which produces nitrogen-enriched air having a higher nitrogen concentration than outside air and supplies the nitrogen-enriched air into the container (11) via a supply passage (44); an oxygen concentration sensor (51) which measures an oxygen concentration of the air in the container (11); and a controller which controls the operation of the gas supply device (30) so that the oxygen concentration measured by the oxygen concentration sensor (51) reaches a target concentration. The container refrigeration apparatus (10) is provided with a measurement passage (88) which guides part of the nitrogen-enriched air passing through the supply passage (44) to the oxygen concentration sensor (51), and an on-off valve (82) is provided for the measurement passage (88).