OIL LEVEL DETECTION DEVICE, AND REFRIGERATING AND AIR-CONDITIONING APPARATUS HAVING MOUNTED THEREON THE OIL LEVEL DETECTION DEVICE

摘要

Provided is an oil level detection device to be mounted on a refrigerating and air-conditioning apparatus, the oil level detection device being configured to detect an oil level of oil accumulated inside a compressor forming the refrigerating and air-conditioning apparatus. The oil level detection device includes an oil level detection unit installed on an outer surface of the compressor and configured to detect a temperature of an installation position, a sensor output unit configured to output, to the refrigerating and air-conditioning apparatus, a signal for changing an operation state of the refrigerating and air-conditioning apparatus, and a determination unit configured to determine depletion of the oil accumulated inside the compressor based on measurement values obtained by the oil level detection unit at least after an output of the signal to be output from the sensor output unit.

主权项

1. An oil level detection device to be mounted on a refrigerating and air-conditioning apparatus, the oil level detection device being configured to detect an oil level of oil accumulated inside a compressor of the refrigerating and air-conditioning apparatus, the oil level detection device comprising:
an oil level detection sensor installed at a position at a predetermined height of the compressor and configured to detect a temperature of the position of installation of the oil level detection device; an output unit configured to output, to the refrigerating and air-conditioning apparatus, a signal to change a compressor suction temperature of refrigerant to be sucked into the compressor; and a determination unit configured to determine whether there is depletion of the oil accumulated inside the compressor by comparing a measurement value obtained by the oil level detection sensor before an output of the signal from the output unit, with a measurement value obtained by the oil level detection sensor after the output of the signal from the output unit.