Patent ID: 7647784
Filing Date: 2010-01-19
Classification: F25B

Abstract:
1. A refrigeration device comprising: a main refrigerant circuit including a compressor that compresses gas refrigerant, a heat source side heat exchanger, a receiver that stores liquid refrigerant, and a user side heat exchanger; and a liquid level detection circuit configured and arranged to detect if a liquid refrigerant level in the receiver is at a predetermined position by extracting a portion of refrigerant from the receiver at a predetermined level of the receiver, reducing the pressure of the portion of the refrigerant extracted, heating the refrigerant after reducing pressure of the refrigerant, measuring the temperature of the portion of the refrigerant extracted, the liquid level detection circuit having a single temperature sensor for measuring the temperature of the portion of the refrigerant extracted, and then returning the portion of the refrigerant extracted to an intake side of the compressor.