OIL BALANCE DEVICE, COMPRESSOR UNIT AND METHOD FOR PERFORMING AN OIL BALANCE OPERATION

摘要

An oil equalizing device, a compressor unit and an oil equalizing method are adapt to an air conditioning unit comprising two or more parallel compressor units (1a, 1b), there are one or more parallel compressors (2a, 3a; 2b, 3b) for each compressor unit; the oil equalizing device comprises oil reservoirs (4a, 4b) and a first pipe, a second pipe, a third pipe and a fourth pipe (25a, 24a, 23a, 20; 25b, 24b, 23b, 20) that are communicated to the oil reservoirs (4a, 4b), each of the pipes has at least one valve (5a, 6a, 7a, 8a; 5b, 6b, 7b, 8b) used to open/close the pipes; when the compressor units are under the normally running state, the first valve and the fourth valve (5a, 8a; 5b, 8b) are close while the second valve and the third valve (6a, 7a; 6b, 7b) are open; when the compressor units are under the oil supplying state, the first valve and the fourth valve (5a, 8a; 5b, 8b) are open while the second valve and the third valve (6a, 7a; 6b, 7b) are close; when the compressor units are under the oil recycling state, the second valve and the fourth valve (6a, 8a; 6b, 8b) are open while the first valve and the third valve (5a, 7a; 5b, 7b) are close; or the third valve and the fourth valve (7a, 8a; 7b, 8b) are open while the first valve and the second valve (5a, 6a; 5b, 6b) are close.