Refrigerating air-conditioning apparatus

摘要

A refrigerating air-conditioning apparatus, at least provided with no possibility that a foreign material returns to a compressor from an accumulator at a time of the pipeline-cleaning operation firstly, and provided with a possibility to perform a collecting operation for the foreign material in a short time secondary, is provided.;The heat-source side unit includes an accumulator provided with a function to separate and collect the foreign material in an existing pipeline, a collecting container for collecting the foreign material separated by the accumulator, and an oil return pipeline for returning refrigerating machine oil to the compressor via a flow amount adjusting device, installed at a lower portion of the accumulator, and at a time of ordinary cooling or heating operation, the refrigerating machine oil is caused to flow into the oil return pipeline, and at a time of pipeline cleaning and foreign material-collecting operations, the flow amount adjusting device is fully closed.

主权项

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.