Patent ID: 8931303
Filing Date: 2015-01-13
Classification: F25B

Abstract:
1. A refrigerating air-conditioning apparatus constructed by connecting a heat-source side unit and a load-side unit with an existing refrigerant pipeline, wherein the heat source side unit comprises: a compressor; an accumulator connected to a suction side of the compressor, the accumulator having a function to separate and collect a foreign material in an existing pipeline; a collecting container for collecting the foreign material separated by the accumulator; a collecting pipeline that connects a bottom portion of the accumulator and the collecting container; an oil return pipeline configured to return refrigerating machine oil to the compressor, the oil return pipeline branches from the collecting pipeline at a position downwardly of the accumulator in a vertical direction and joins with a pipeline between the accumulator and the suction side of the compressor via flow amount adjusting means; and a degassing pipe connecting a low-pressure side main refrigerant circuit pipeline extending from a four-way valve of the heat-source side unit to a compressor-suction side and the collecting container, wherein an end portion of the degassing pipe being connected to the low-pressure side main refrigerant circuit pipeline protrudes into and through an inner surface of the low-pressure side main refrigerant circuit pipeline, and wherein at a time of ordinary cooling or heating operation, the refrigerating machine oil is made to flow into the oil return pipeline, and at a time of pipeline cleaning and foreign material-collecting operations, the flow amount adjusting means is fully closed.