Refrigerating Air-Conditioning Apparatus

Abstract

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.

1 - 21 . (canceled) 
   
   
       22 . 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 an accumulator provided with a function to separate and collect a foreign material in an existing pipeline, and a collecting container for collecting the foreign material separated by the accumulator, and further comprises,   an oil return pipeline for returning refrigerating machine oil to a compressor via a flow amount adjusting means, at a lower portion of the accumulator, and   wherein 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 means is fully closed.   
   
   
       23 . The refrigerating air-conditioning apparatus according to  claim 22 , wherein an inlet pipe of the accumulator is installed in a manner for refrigerant gas flowing into the accumulator to become a flow following in a horizontal direction of a side wall in the accumulator. 
   
   
       24 . The refrigerating air-conditioning apparatus according to  claim 22 , wherein an outlet pipe of the accumulator is formed to have a structure opening at an upper part in an inside of the accumulator. 
   
   
       25 . The refrigerating air-conditioning apparatus according to  claim 22 , comprising a low-pressure side circuit constructed by connecting a four-way valve, the accumulator and the compressor in the order, in an inside of the heat-source side unit, and further comprising:
 a low-pressure side pressure sensor provided in a pathway from the four-way valve to the compressor;   a temperature sensor provided in the accumulator-inlet side refrigerant pipeline; and   a means for calculating a superheat of a refrigerant at the accumulator-inlet side.   
   
   
       26 . The refrigerating air-conditioning apparatus according to  claim 25 , performing a control for a superheat at the accumulator-inlet side to be kept in a plus-area, and a control for a liquid refrigerant in the accumulator to be evaporated. 
   
   
       27 . The refrigerating air-conditioning apparatus according to  claim 22 , wherein a low-pressure side main refrigerant circuit pipeline from the four-way valve of the heat-source side unit to a compressor-suction side and the collecting container are connected by a degassing pipe. 
   
   
       28 . A refrigerating air-conditioning apparatus constructed by connecting a heat-source side unit and a load-side unit by an existing refrigerant pipeline,
 wherein the heat-source side unit comprises an accumulator provided with a function to separate and collect a foreign material in an existing pipeline, and a collecting container for collecting the foreign material separated by the accumulator, and   wherein a low-pressure side main refrigerant circuit pipeline from the four-way valve of the heat-source side unit to a compressor-suction side, and the collecting container are connected by a degassing pipe, and a portion where the degassing pipe is connected to the low-pressure side main refrigerant circuit pipeline has an inner diameter being throttled to have a diameter less than a diameter of front and rear portions thereof.   
   
   
       29 . The refrigerating air-conditioning apparatus according to  claim 28 , wherein the portion having the throttled inner diameter where the degassing pipe is connected to the low-pressure side main refrigerant circuit pipeline is throttled into 90% or less than the inner diameter of the pipeline in the front and rear thereof by cross-section area. 
   
   
       30 . The refrigerating air-conditioning apparatus according to  claim 28 , wherein the degassing pipe is connected to an inlet-side refrigerant pipeline of the accumulator. 
   
   
       31 . The refrigerating air-conditioning apparatus according to  claim 28 , wherein a bottom surface of the accumulator and an upper part of the collecting container are connected by a pipeline, and a pipeline connecting portion of the collecting container is disposed at a position lower than the bottom surface of the accumulator. 
   
   
       32 . The refrigerating air-conditioning apparatus according to  claim 28 , wherein at a connecting portion for connecting the degassing pipe to the low-pressure side main refrigerant circuit pipeline, the degassing pipe is connected to a position higher than a horizontal position of an axial transverse section of the low-pressure side refrigerant circuit pipeline. 
   
   
       33 . A refrigerating air-conditioning apparatus constructed by connecting a heat-source side unit and a load-side unit by an existing refrigerant pipeline,
 wherein the heat-source side unit comprises an accumulator provided with a function to separate and collect a foreign material in an existing pipeline, and a collecting container for collecting the foreign material separated by the accumulator, and   wherein a low-pressure side main refrigerant circuit pipeline from the four-way valve of the heat-source side unit to a compressor-suction side, and the collecting container are connected by a degassing pipe, and an end portion of the degassing pipe, to be connected to the low-pressure side main refrigerant circuit pipeline is protruded out into the low-pressure side main refrigerant circuit pipeline.   
   
   
       34 . The refrigerating air-conditioning apparatus according to  claim 33 , wherein the end portion of the degassing pipe, to be connected to the low-pressure side main refrigerant circuit pipeline comprises a tip end shape for an opening portion thereof to face a downstream side. 
   
   
       35 . The refrigerating air-conditioning apparatus according to  claim 33 , wherein the portion of the low-pressure side main refrigerant circuit pipeline where the degassing pipe is connected thereto has an inner diameter being throttled to have a diameter less than a diameter of front and rear portions thereof. 
   
   
       36 . The refrigerating air-conditioning apparatus according to  claim 22 , wherein an oil separator is provided at a high-pressure side of the heat-source side unit, and wherein an oil tank is provided in a middle of a pipeline for oil return, connecting the oil separator and the compressor of the heat-source side unit. 
   
   
       37 . The refrigerating air-conditioning apparatus according to  claim 22 , wherein an electric operation-type opening and closing valve is provided in a pipeline for connecting the collecting container and a component of the heat-source side unit. 
   
   
       38 . The refrigerating air-conditioning apparatus according to  claim 22 , wherein a manual opening and closing valve is provided in a pipeline for connecting the collecting container and a component of the heat-source side unit. 
   
   
       39 . The refrigerating air-conditioning apparatus according to  claim 37 , wherein a pressure escape valve is provided in the pipeline for connecting the collecting container and the component of the heat-source side unit. 
   
   
       40 . The refrigerating air-conditioning apparatus according to  claim 22 , wherein the accumulator or the collecting container is sheathed or internally equipped with a heater. 
   
   
       41 . The refrigerating air-conditioning apparatus according to  claim 22 , wherein a bypass pipe is provided from a high-pressure side from the compressor to the four-way valve, to a portion in front of the accumulator, or to the accumulator, via a bypass valve. 
   
   
       42 . The refrigerating air-conditioning apparatus according to  claim 41 , wherein the foreign material is drawn into the collecting container by generating a pressure difference between the collecting container and the accumulator, by means of opening and closing the bypass valve or a throttling device housed in the heat-source side unit or the load-side unit. 
   
   
       43 . The refrigerating air-conditioning apparatus according to  claim 28 , wherein an oil separator is provided at a high-pressure side of the heat-source side unit, and wherein an oil tank is provided in a middle of a pipeline for oil return, connecting the oil separator and the compressor of the heat-source side unit. 
   
   
       44 . The refrigerating air-conditioning apparatus according to  claim 33 , wherein an oil separator is provided at a high-pressure side of the heat-source side unit, and wherein an oil tank is provided in a middle of a pipeline for oil return, connecting the oil separator and the compressor of the heat-source side unit. 
   
   
       45 . The refrigerating air-conditioning apparatus according to  claim 28 , wherein the accumulator or the collecting container is sheathed or internally equipped with a heater. 
   
   
       46 . The refrigerating air-conditioning apparatus according to  claim 33 , wherein the accumulator or the collecting container is sheathed or internally equipped with a heater. 
   
   
       47 . The refrigerating air-conditioning apparatus according to  claim 28 , wherein a bypass pipe is provided from a high-pressure side from the compressor to the four-way valve, to a portion in front of the accumulator, or to the accumulator, via a bypass valve. 
   
   
       48 . The refrigerating air-conditioning apparatus according to  claim 33 , wherein a bypass pipe is provided from a high-pressure side from the compressor to the four-way valve, to a portion in front of the accumulator, or to the accumulator, via a bypass valve. 
   
   
       49 . The refrigerating air-conditioning apparatus according to  claim 47 , wherein the foreign material is drawn into the collecting container by generating a pressure difference between the collecting container and the accumulator, by means of opening and closing the bypass valve or a throttling device housed in the heat-source side unit or the load-side unit. 
   
   
       50 . The refrigerating air-conditioning apparatus according to  claim 48 , wherein the foreign material is drawn into the collecting container by generating a pressure difference between the collecting container and the accumulator, by means of opening and closing the bypass valve or a throttling device housed in the heat-source side unit or the load-side unit.