| 摘要 |
An improved refrigerant recovery and recycle system is disclosed. Refrigerant vapor, refrigerant liquid and oil entering the system from a refrigerant circuit being discharged are separated into liquid and vapor phases at near atmospheric pressure. Any remaining liquid refrigerant is vaporized within the phase separation means (5) by heat from the surrounding environment. Oil free refrigerant vapor flows through a selective adsorption column (8), which removes gaseous contaminants and water vapor, into a flexible membrane variable volume storage container (14) where it is confined at atmospheric pressure. Inventory of refrigerant vapor within the container is continuously monitored by means of a weight scale (15) which is adapted to compensate for the buoyancy of the surrounding atmosphere. Any air that enters the system stratifies at the top of the container (14) and is eliminated by operation of a piston pump (26). A comparative thermal conductivity detector (24) monitors the contaminant concentration of the fluid being purged. An oil-free compressor (17) facilitates recycling of the recovered refrigerant vapor through the purification process and provides the elevated vapor pressure necessary to accomplish transfer of the recycled refrigerant vapor from the system to an operating refrigerant circuit. An ejector pump (47) provides a means of evacuating refrigerant circuits being discharged to sub-atmospheric pressure.
|
