Refrigerant circulatory system with undercooling function

Abstract

The invention discloses a refrigerant circulatory system with an undercooling function, and relates to the field of an air conditioner. The refrigerant circulatory system has the effect of optimizingcooling of an oilless bearing and includes a compressor, a drainage branch and a cooling branch. The compressor includes a bearing and an electromotor; the drainage branch is structured as a cooling bearing. Heat exchange between the cooling branch and the drainage branch is used to cool a refrigerant in the drainage branch; the cooling branch is further structured as a cooling electromotor. The technical scheme realizes undercooling of a bearing refrigerant so that the temperature of the refrigerant used to cool the bearing is lower; the cooling effect of the bearing is optimized; the problemof heat accumulation during work of the oilless bearing is solved; and meanwhile the cooling of the electromotor is realized.

Description

technical field [0001] The invention relates to the field of refrigeration equipment, in particular to a refrigerant circulation system with a supercooling function. Background technique [0002] With the continuous development of oil-free technology, oil-free bearings are gradually applied to centrifugal compressors, which solves the problems of after-sales regular maintenance caused by the oil circuit system, and oil leakage reduces the performance of the whole machine. [0003] However, as the support of the rotor system, the oil-free bearing will inevitably generate heat. In order to ensure the reliability and stability of the bearing operation, it is necessary to remove the heat generated by the bearing in time. Similar to lubricating oil cooling for oil bearings, oil-free bearings are cooled by cooling medium, and from the perspective of cooling effect, the cooling medium used for cooling bearings should be in a liquid state, and the effect is better. If a certain deg...

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Problems solved by technology

[0004] The inventors have found that there are at least the following problems in the prior art: Even if the medium used for cooling the bearing is in a liquid state before cooling, since the cooling process of the bearing is a heat absorption process of the cooling medium, part of the cooling medium absorbs heat in the process of cooling the bearing gasification

The gasified cooling medium will bring two hidden dangers: 1. The gaseous state has a large compressibility, resulting in an unstable gap between the bearing and the rotor. When the rotor rotates at high speed, the gap is likely to cause instability and noise; 2. The entropy of the gaseous cooling medium increases, and part of it remains in the bearing cavity and flow channel, causing partial blockage and affecting heat exchange efficiency

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