Air conditioner

Abstract

An air conditioner in which, when a value calculated in heating operation by an oil amount calculation section (51) is more than or equal to a predetermined value, a frequency control section (52) of a controller (50) increases the frequency of operation of a compressor (21) in order to recover refrigeration machine oil in a refrigerant circuit (R).

Description

technical field [0001] The present invention relates to an air conditioner, in particular to a technique for recovering refrigerating machine oil remaining in a refrigerant circuit to a compressor. Background technique [0002] Conventionally, a refrigerating apparatus that performs a refrigeration cycle by circulating a refrigerant in a refrigerant circuit is known, and applications of the refrigerating apparatus are expanding to air conditioners and the like. For example, the air conditioner disclosed in Patent Document 1 uses a so-called hermetic compressor. In the hermetic compressor, the compressor and the motor are housed in one housing. Furthermore, in this hermetic compressor, an oil supply passage is formed on the drive shaft of the compression mechanism, and the refrigerating machine oil stored at the bottom of the casing is supplied to the compression mechanism through the oil supply passage. [0003] Patent Document 1: Japanese Laid-Open Patent Publication No. ...

AI Technical Summary

Problems solved by technology

[0006] However, in such a method, for example, when the air conditioner is in the heating operation, it is necessary to temporarily switch to the cooling operation only to recover the refrigerating machine oil, and then return to the heating operation after the refrigerating machine oil is recovered. There is a problem that the heating capacity drops significantly

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