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...

AI Technical Summary

Problems solved by technology

[0008] Since the low-pressure stage compressor and the high-pressure stage compressor in the above-mentioned two-stage screw refrigeration compression dispersion system are respectively equipped with independent oil circuit circulation systems, the two sets of oil circuit circulation systems overlap, and generally use dual oil pumps, one for operation and one for standby. Due to the forced oil supply and the excessively large motor power configuration of the low-pressure compressor, its installation and connection are complicated, bulky and bulky. At the same time, there are many components, and the entire system can only be installed in a scattered manner, which will inevitably occupy a large building area. Equipment investment costs and land construction costs have increased significantly

Moreover, if a compressor fails in the bulk system, the entire refrigeration system will be paralyzed.

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