Dual parallel compressor screw water chilling unit

Abstract

The invention relates to the technical field of a screw water chilling unit, particularly to a dual parallel compressor screw water chilling unit. An evaporator (3) is a falling film evaporator. A first overflow pipe (10) for redundant lubricating oil output is arranged on a first compressor (4) and a second overflow pipe (11) for redundant lubrication oil output is arranged on a second compressor (5). The first overflow pipe (10) communicates with a first exhaust pipe (8) and the second overflow pipe (11) communicates with a second exhaust pipe (9). A partition (12) for isolating the lubricating oil separated from the two compressors is arranged in a twice oil separator (1).The dual parallel compressor screw water chilling unit has the advantages of having a nice oil return effect, a simple structure, a reliable work, an energy conservation, an environment friendliness and a low cost.

Description

technical field [0001] The invention relates to the technical field of screw chillers, in particular to a double-compressor parallel screw chiller. Background technique [0002] Conventional screw chillers operate at partial load more than 90% of the time. The integrated partial load coefficient of performance (IPLV) of the screw chiller throughout the service season can better reflect whether the unit is energy efficient than the full load coefficient of performance (COP) under nominal conditions. In recent years, in order to achieve the purpose of energy saving, government departments have also issued policies requiring that the set temperature of air conditioners in public buildings should not be lower than 26°C in summer and not higher than 20°C in winter. This allows the air conditioning unit to run more of the time at part load. Improving the part-load performance of the unit has great significance for building energy saving. [0003] Due to the constraints of mater...

AI Technical Summary

Problems solved by technology

In actual operation, often due to the unreasonable design of the oil circuit system, the compressor is short of oil, causing failures such as burning and alarming, making the system unable to operate normally

A "multi-machine parallel intelligent oil circuit balancing system" is disclosed on the website of the State Intellectual Property Office of China, which provides a technical solution, but this solution requires the compressor to be equipped with an oil level sensor. The disadvantage is that the cost is high and the assembly is difficult. Difficult to achieve

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