Centrifugal compressor and refrigeration system having same

Abstract

The invention discloses a centrifugal compressor and a refrigeration system provided with the same. The centrifugal compressor comprises a casing, a first shaft, a second shaft and an oil return device, wherein the first shaft is in rotatable fit with the casing; the second shaft is connected with the first shaft through a gear assembly to drive the first shaft to rotate; and the oil return device is used for supplying a gas-liquid mixed refrigerant containing lubricating oil in the refrigeration system where the centrifugal compressor is located to the gear assembly. According to the centrifugal compressor, the gear assembly can be cooled and lubricated simply, reliably and efficiently, a high-grade pure-liquid refrigerant is not needed to be introduced additionally, the problems of washing of an oil film on the gear surface and gear wear caused by the washing of the oil film are solved, and precise and reliable transmission of the gear assembly is guaranteed.

Description

technical field [0001] The invention relates to the field of compressor equipment, in particular to a centrifugal compressor and a refrigeration system with the same. Background technique [0002] In large-scale heavy-duty gear speed-increasing refrigeration centrifugal compressors, the cooling and lubrication of the gear pair and the design of the system are of great significance to the efficient and reliable operation of the compressor. The cooling and lubrication of the centrifugal compressor gear pair and the design of the system in the related art generally include a separate coolant solenoid valve and its pipeline, a coolant filter, and a coolant distributor. The system uses oil splash gear pairs for cooling and lubrication , where the coolant is mostly liquid refrigerant. [0003] However, this design has the following disadvantages: 1), an extra set of gear pair cooling components and piping system, which increases the complexity of the system and reduces the reliab...

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Problems solved by technology

[0003] However, this design has the following disadvantages: 1), an extra set of gear pair cooling components and piping system, which increases the complexity of the system and reduces the reliability of the system; 2), uses high-grade pure liquid refrigerant Cooling the gear pair consumes system energy and loses system efficiency; 3), the high-speed and high-pressure liquid refrigerant may wash the lubricating oil film on the gear pair tooth surface, resulting in poor lubrication of the gear meshing surface, resulting in tooth surface wear when the tooth surfaces slide relative to each other Serious; 4), only relying on the primary oil splashed to the gear after lubrication of the bearing for tooth surface lubrication, cannot guarantee good lubrication of the gear pair

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