| 摘要 |
A system for recovering compressible refrigerant from a refrigeration system, of the type having a compressor for lowering the pressure in the refrigeration system to effect the withdrawal of the refrigerant therefrom, and directing the refrigerant to a storage cylinder. The system is operable in a storage cylinder cooling mode of operation wherein the temperature and pressure of the refrigerant withdrawn from the system and stored in the cylinder is lowered. A control system for limiting the pressure ratio across the compressor during operation of the recovery system is provided. The control system includes first means for determining the suction pressure of the compressor and for terminating operation of the recovery system when a desired termination pressure is reached. A second means is provided for determining suction pressure of the compressor, and, for interrupting power to the compressor, and generating a signal perceivable to the user of the recovery system when a predetermined suction pressure greater than the termination pressure is reached. Means are provided for determining the discharge pressure of the compressor, and, for selectively placing the first means for determining suction pressure in the circuit of the control system when the discharge pressure is less than a predetermined value, or, for placing the second means for determining suction pressure in the control system when the discharge pressure equals or exceeds the predetermined value.
|
