| 摘要 |
PROBLEM TO BE SOLVED: To provide an air conditioner capable of assuring an appropriate quantity of oil required by each compressor, when a plurality of the compressors are operated simultaneously or operated individually. SOLUTION: A first on-off valve 9a, a first oil separator 8a and a second oil separator 8b are connected in series, between a discharge pipe 1a1 of the first compressor 1a and a four-way valve 2. A third oil separator 8c is connected in series between discharge pipes 1b1 and 1c1 of the second and third compressors 1a and 1b and the second oil separator 8b via a second on-off valve 9b and a third on-off valve 9c. The respective compressors are connected by oil-equalizing pipes 12a and 12b and equalizer lines 13a and 13b. An oil return pipe 8a1 of the first oil separator 8a is connected in series to a suction pipe 1a2 of the first compressor 1a via a fourth on-off valve 9d. An oil return pipe 8b1 of the second oil separator 8b is connected in series to a suction pipe 1a2 of the first compressor 1a via a sixth on-off valve 9f. An oil level sensor 11 and an orifice 11a are connected in series between the oil equalizing pipe 12a and the equalizer line 13a. The sixth on-off valve 9f is controlled to be opened and closed, according to the height of the oil level detected by the oil level sensor 11.
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