Multi-stage rotary compressor and its method for setting elimination volume ratio

Abstract

A multi-stage compression type rotary compressor 10 is provided with an electrical-power element 14, the first and second rotary compression elements 32, 34 driven by a rotary shaft 16 of the electrical-power element 14 in a sealed vessel 12. The refrigerant compressed by the first rotary compression element 32 is compressed by the second rotary compression element 34. The refrigerant is combustible. The refrigerant compressed by the first rotary compression element 32 is discharged to the sealed vessel 12. The discharged medium pressure refrigerant is compressed by the second rotary compression element 34. Additionally, the displacement volume ratio of the second rotary compression element 34 to the first rotary compression element 32 is set not less than 60% and not more than 90%. By using the multi-stage compression type rotary compressor, a rotary compressor using a combustible refrigerant can be carried out.

Description

technical field [0001] The present invention relates to a multi-stage compression rotary compressor and a method for setting the excluded volume ratio thereof. The multi-stage rotary compressor is equipped with an electric component located in a closed container, and the first motor driven by the rotary shaft of the electric component 1 and the second rotary compression assembly, and the refrigerant compressed by the first rotary compression assembly is compressed by the second rotary compression assembly, and the refrigerant gas compressed and discharged by the first rotary compression assembly is sucked into the second rotary compression assembly, Spit out with compression. Background technique [0002] This kind of known rotary compressor sucks the refrigerant gas from the suction port of the rotary compression assembly into the low-pressure chamber side of the cylinder, and then compresses it by the action of the rollers and blades, and discharges it from the discharge p...

AI Technical Summary

Problems solved by technology

Moreover, because the eccentricity of the rotary shaft of the first rotary compression assembly and the second rotary compression assembly is different, the rotary shaft needs to be processed in sections, and the processing steps increase

[0012] Therefore, the following problems arise, such as the increase of working time accompanying the change of parts, and the cost incurred due to the change of parts (including changes in material types, processing equipment, measuring instruments, etc.)

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