Model stage special for pipeline compressor

Abstract

The invention belongs to a centrifugal compressor model stage, and particularly relates to a model stage special for a pipeline compressor. The model stage is suitable for modeling design of a pipeline compressor product. The model stage comprises an impeller, a vaneless diffuser, a curve and a backflow device; the impeller is located at the inlet position of the model stage, the vaneless diffuser is arranged at an outlet of the impeller, the backflow device is located at the outlet position of the model stage, and the vaneless diffuser is communicated with the backflow device through the bend; and the design machine mach number Mu2 of the model stage is 0.35 to 0.5, the flow coefficient phi1 is equal to 0.023 to 0.053, the energy head coefficient tau is equal to 0.47 to 0.71, the design condition point polytropic efficiency etapol under each mach number is equal to 0.846 to 0.873, the hub ratio ds / D2 of the model stage is equal to 0.4, and the ratio L / D2 of the span to the diameter is 0.292. The model stage is high in efficiency, high in energy head coefficient, large in hub ratio and small in span; by means of the model stage, the pipeline compressor can have the higher running efficiency and wider working condition scope; and meanwhile, the rotor working rotating speed can be decreased, the bearing span is shortened, and the rotor stability is improved.

Description

technical field [0001] The invention belongs to a centrifugal compressor model stage, specifically a special model stage for pipeline compressors, which is suitable for the modeling design of various pipeline compressor products. Background technique [0002] In the development process of centrifugal compressors, the design of the model stage is very critical, and the development of new products depends on the corresponding model stage. [0003] The model stage is generally used in branch compressors of pipeline compressors due to its small flow coefficient; however, due to the shortcomings of the existing model stage, such as small hub ratio, large axial span, and low efficiency, in the process of product design, the shaft shaft is rotated. Small diameter, long shaft, and then there are major problems in the critical speed of the product, the stability of the rotor and the stiffness of the shaft, which brings great difficulties to the product design. In addition, the perfo...

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Problems solved by technology

[0003] Due to the small flow coefficient of the model stage, it is generally used in the branch line compressor of the pipeline compressor; but because the existing model stage has the disadvantages of small wheel hub ratio, large axial span, and low efficiency, so the shaft shaft in the process of product design The diameter is small and the shaft is long, and there are big problems in the critical speed of the product, the stability of the rotor and the rigidity of the shaft, which brings great difficulties to product design.

In addition, the performance of the unit is lower than that of similar foreign products

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