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|1. (WO2017038055) FREEZER DEVICE FOR CONTAINERS|
|Applicants:||DAIKIN INDUSTRIES, LTD.
|Title:||FREEZER DEVICE FOR CONTAINERS|
A gas supply device that reduces the oxygen concentration of an internal space by supplying nitrogen-enriched air to the internal space of a container. The gas supply device stops when the oxygen concentration in the internal space gradually reduces and reaches a reference concentration C2. When external air penetrates into the internal space from a gap between the container and a container freezer device, the oxygen concentration in the internal space subsequently increases. When the oxygen concentration in the internal space increases and reaches an upper limit concentration C3, an internal fan control unit switches the rotation speed of an internal fan from "high speed" to "low speed" and starts the gas supply device. As a result, the amount of external air penetrating the internal space can be reduced and the oxygen concentration of the internal air can be reliably reduced.