Volute structure, centrifugal compressor and refrigeration equipment

Abstract

The invention discloses a volute structure, a centrifugal compressor and refrigeration equipment, and relates to the field of refrigeration equipment. An existing centrifugal compressor structure is optimized. The volute structure comprises a box body, a volute body and a return device. The volute body comprises an inner volute and an outer volute independent from the inner volute. A fluid channel is formed between the inner volute and the outer volute. The inner volute and the return device are arranged together. According to the technical scheme, the length of the section of a primary pressure expander can be increased so that the pressure expansion effect of gas entering the primary pressure expander can be improved, and then the unit performance of the centrifugal compressor is improved.

Description

technical field [0001] The invention relates to the field of refrigeration equipment, in particular to a volute structure, a centrifugal compressor and refrigeration equipment. Background technique [0002] In the structure of two-stage and multi-stage centrifugal compressors, in order to reduce the length of the cantilever end of the main shaft, increase the critical speed, and enhance stability, it is often necessary to make the pneumatic part of the multi-stage compression very compact. The high number of components involved makes the arrangement of the individual components of the pneumatic part of the centrifugal compressor difficult. Especially in the forward-inclined multi-stage compression of the volute, the distance between the volute and the bend behind the outlet of the first-stage diffuser is very close, and the structure cannot meet the requirements. [0003] figure 1 It is a schematic layout diagram of the pneumatic part of a two-stage centrifugal compressor ...

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Problems solved by technology

[0004] The inventors have found that there are at least the following deficiencies in the prior art: reducing the length of the primary diffuser section will make the gas entering the centrifugal compressor unable to undergo sufficient diffusion, which will reduce the unit performance of the centrifugal compressor

However, increasing the length of the main shaft 20 will lead to a decrease in the critical speed of the compressor, a decrease in the operating stability of the unit, and a decrease in performance

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