Air conditioner

Abstract

Prediction error in quantity of refrigerant due to difference in solubility of refrigerant into oil is minimized by eliminating refrigerant liquefied into refrigerating machine oil in a compression machine mechanism. The air conditioner (1) comprises a refrigerant circuit (7), means (8a-8c) for judging refrigerant, and operation controllers (6a-6c). The refrigerant circuit includes heat source units (2a-2c), refrigerant communication pipings (4, 5), expansion mechanisms (31a, 31b, ...), and utilization units (29a-29c, 3a, 3b, ...). The refrigerant communication piping is connected with the heat source units and the utilization units. The heat source unit has compression mechanisms (21a-21c) and heat source side heat exchangers (24a-24c). The means for judging liquefied refrigerant can judge the situation of liquefied refrigerant in the compression mechanism. When liquefied refrigerant is detected in the compression mechanism before operation for judging the quantity of refrigerant in the circuit is performed, the operation controller performs an operation for eliminating the liquefied refrigerant.

Description

technical field [0001] The invention relates to a refrigerant circuit of an air conditioner and an air conditioner with the refrigerant circuit. Background technique [0002] There is a configuration disclosed in Patent Document 1 as a refrigerant leakage detection device of a conventional refrigeration device. In this refrigerant leakage detection device, the condensing refrigerant temperature and the evaporating refrigerant temperature are adjusted to a certain value by the condensing refrigerant temperature regulating device and the evaporating refrigerant temperature regulating device, and the temperature of the condensing refrigerant is adjusted to a certain value by the output of the discharge refrigerant temperature detector The temperature difference calculation means that compares the signal with the set value to calculate the temperature difference performs a refrigerant leak detection operation that detects a refrigerant leak of the refrigerating cycle. Therefore...

AI Technical Summary

Problems solved by technology

[0004] However, in the technique of Patent Document 1, since the amount of refrigerant dissolved in the refrigerating machine oil in the compression mechanism increases when the ambient temperature is low, the prediction error of the amount of refrigerant may increase.

Especially when the internal oil temperature is low immediately after the compressor starts and when there are multiple compressors but only some of the compressors are driven in the refrigerant leak detection operation, the detection error of the refrigerant leakage increases

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