Dual-locomotive and dual-stage screw refrigerating compressor set

Abstract

This kind of double-machine, double-screw cold compressor system mainly consists of evaporator, compressor in low-pressure zone, compressor in high-pressure zone, recycle unit to separate oil, condenser, condenser in the middle part, low-pressure economizer system. There is no inspiration passage between evaporator and compressor in high-pressure zone. The vent on compressor in low-pressure zone connects directly with the air entry on compressor in high-pressure. Compressors low-pressure zone and high-pressure zone share one recycle unit of oil separation. Condenser, condenser in the high-pressure zone, economizer system in low-pressure zone and evaporator are linked up in that order so that part of the refrigerating medium can absorb enough heat to boil and evaporate, provide vapor at a temperature near saturation to the compressor in the high-pressure zone and supply vapor to the compressor in the low-pressure zone. Meanwhile, the other part of refrigerating medium will be passed to the evaporator after being cooled twice for recycle. It is the best choice among the products of refrigeration and deepfreeze in low temperature because of its tidy and compact structure, reasonable layout, small size, stable and credible operation, low cost and high cooling performance.

Description

technical field [0001] The invention relates to a screw type refrigeration compressor unit, in particular to a double-machine two-stage screw type refrigeration compressor unit. Background technique [0002] The single-stage screw refrigeration compressor unit is mainly composed of a screw refrigeration compressor, an oil separator, an oil cooler, an oil filter, an oil pump and a circulation pipeline, etc., and together with an evaporator and a condenser, they form a single-stage screw refrigeration compressor. system. The screw refrigeration compressor draws refrigerant vapor from the evaporator, compresses the refrigerant vapor, and discharges the pressurized vapor from the oil separator to the condenser. In the condenser, the refrigerant vapor exchanges heat with the cooling medium and is condensed into a liquid with a certain pressure. The liquid at a certain pressure enters the evaporator after being lowered in temperature and pressure by the throttling device. In th...

Images