Daikin Industries, Ltd.

Masataka Nakano

Noritaka Kamei

Yuusuke Fujimoto

Naohiro Tanaka

Kiichirou Satou

Kazuma Yokohara

Atsushi Ozato

Maho Takayama

Akitoshi Ueno

Hidenori Matsui

Motomi Nishimoto

Shouichi Tanno

A quality determination apparatus includes a state detector and a main processing unit. The state detector detects a state index. The state index is an index indicating a state of a target article contained in a storage space where an internal environment is controlled. The main processing unit performs a determination operation. The determination operation is an operation of determining whether a sign condition indicating a sign of degradation of the target article is met based on the state index detected by the state detector.

Quality determination device

An abnormality determination device () includes a calculator () calculating a deviation degree of a compressor () from a normal state based on data related to operation of a refrigeration apparatus () and a determination unit () determining whether the compressor () has an abnormality or estimating an abnormality occurrence time based on a calculation result of the calculator (). The calculator () calculates a first index value from data related to operation of the refrigeration apparatus () in a first period and a second index value from data related to operation of the refrigeration apparatus () in a second period that differs in length from the first period. The calculator () calculates the deviation degree of the compressor () from the normal state based on the first index value and the second index value. The determination unit () determines whether the compressor () has an abnormality or estimates an abnormality occurrence time based on the deviation degree of the compressor () from the normal state.

Abnormality determination device, freezing device including this abnormality determination device, and abnormality determination method for compressor

A CA system includes a gas supply device which performs a gas supply operation of supplying nitrogen-enriched air into a container, and a controller which performs the gas supply operation so that the inside air has a desired composition. The controller performs carbon dioxide priority control in which the controller performs the gas supply operation if an oxygen concentration of the inside air is equal to or higher than a ceiling concentration higher than a target oxygen concentration, stops the gas supply operation if a carbon dioxide concentration of the inside air is lowered to a critical concentration lower than a target carbon dioxide concentration, and restarts the gas supply operation if the carbon dioxide concentration of the inside air has reached a restart concentration higher than the target carbon dioxide concentration through breathing of the plants.

Indoor air-conditioning device and container refrigeration device equipped with same

A gas supply device is configured such that its supply state is switchable between a first supply state supplying, as supply air, nitrogen-enriched air produced from outside air into a containe, and a second supply state in which the gas supply device takes outside air therein and supplies, as supply air, the outside air into the container. A CA system is provided with a branch pipe which guides at least part of the supply air flowing through a supply passage to an oxygen sensor, and an open/close valve which opens/closes the branch pipe. An outside air calibration operation is performed in which the open/close valve is opened in the second supply state to guide the least part of the outside air flowing through the supply passage to the oxygen sensor, thereby calibrating the oxygen sensor using the outside air.

Refrigeration device for container

Disclosed is a gas supply device provided for a container in which a breathing plant is housed. The device supplies nitrogen-enriched air into the container. The device is provided with a malfunction diagnosis section which checks whether each of components of the device works properly or not and specifies a malfunctioning portion if an oxygen concentration of the nitrogen-enriched air does not fall to or below a predetermined concentration. The malfunction diagnosis section checks whether each of an air pump, a motor, and a switching mechanism works properly or not, and determines that an adsorbent is not working properly when it is determined that all of the air pump, the motor, and the switching mechanism are working properly.

Gas supply device and refrigeration device for container provided with said gas supply device

According to the present disclosure, in a container refrigeration apparatus configured to cool the inside of a container, the accuracy of determination of occurrence of a lock abnormality and a connection abnormality of a motor is increased, and erroneous detection of the motor abnormalities is reduced or prevented. The container refrigeration apparatus of the present disclosure includes an abnormality determinator configured to compare a value for current flowing through an in-compartment motor with a preset current threshold to determine occurrence of the motor abnormalities of the in-compartment motor, and a threshold changer configured to change the current threshold of the abnormality determinator in accordance with a supply voltage for each supply frequency of a power supply configured to supply power to the in-compartment motor.

Growing community of inventors

Osaka, Japan

Masataka Nakano