FIELD: machine building.
SUBSTANCE: vacuum centrifugal compressor containing compression casing that is divided by partition to two sections, in the sections there are two rotors with impellers on common shaft that is mounted in casing on bearings. Note that the shaft has end seals, and sections have, at least, one inlet and discharge pipe branches and are connected by balancing line, according to the change, at least, one inlet pipe branch is located in the middle part of compression casing near partition, and supply pipe branches are located near end walls of compression casing, impellers of one section are located relatively the impellers of the other section by principle "face to face", and balancing line connects pressure cavities of sections. Invention task is to minimise buffer gas leakages into atmosphere and compressor.
EFFECT: reduction of centrifugal pump size, maintaining process gas concentration in compression casing.
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