| 摘要 |
<p>A refrigerant recovery system (10) which includes a compressor (18) having an input coupled through an evaporator and through a solenoid valve to the refrigeration system from which refrigerant is to be withdrawn, and an output coupled through a condenser to a refrigerant storage container (50). The evaporator and condenser are contained within a closed cylindrical canister (26) for heat exchange and oil separation, the canister (26) having an oil drain valve (86) in the bottom. The refrigerant storage container (50) is carried by a scale (72) having a limit switch (68) coupled to control electronics (74) to prevent or terminate further refrigerant recovery when the container (50) is full. The entire system (10), including the control electronics (74), is mounted on a two-wheel hand truck (12) to facilitate transport to a job site such as a building air conditioning or heat pump system. Apparatus for purifying recovered refrigerant (140) includes a replaceable core filter/dryer (148), and a liquid pump (142) for circulating refrigerant from the liquid port (57) of the storage container through the core (148) and then to the container vapor port (49). A differential pressure gauge (170) is connected across the filter/dryer (148) to indicate need for core replacement. A moisture indicator (104) displays water concentration in the refrigerant. The purification apparatus (140) may be either separate from or combined with the recovery system (10).</p> |
