Pipeline compressor model level of 0.022 in flow coefficient and impeller designing method

Abstract

The invention provides a pipeline compressor model level of 0.022 in flow coefficient. The pipeline compressor model level comprises an impeller, a vaneless diffuser, a bend and a backflow device. The impeller is positioned at an inlet of a ninth model level, the vaneless diffuser is arranged at an outlet of the impeller, the backflow device is positioned at an outlet of the ninth model level, and the vaneless diffuser is communicated with the backflow device through the bend; machine mach number Mu2 of the ninth model level is 0.35-0.6, design point flow coefficient phi 1 is 0.022, design point energy head coefficient t is 0.588, polytropic efficiency npcl in design flow coefficient working condition under each mach number is 0.812-0.817, and applied flow range is 60-150% of a design point. The invention further provides a design method of the impeller with the model level. The ninth model level is high in efficiency and energy head coefficient, large in rub ratio and small in span; by adopting the model level, a light-medium compressor is enabled to have high running efficiency and wide working condition range, working rotation speed of a rotor can be lowered, bearing span can be reduced, and stability of the rotor can be improved.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a model stage and impeller design method of a pipeline compressor with a flow coefficient of 0.022. Background technique [0002] The pipeline compressor is the key equipment of the national key project of the West-to-East Gas Transmission Project. During its research and development process, the design of the model stage 9 is very critical, and the development of new products depends on the corresponding model stage 9. [0003] The existing pipeline model stage 9 has disadvantages such as small hub ratio, large axial span, and low efficiency. Therefore, in the process of product design, the diameter of the shaft is small and the shaft is long, and the critical speed of the product, the stability of the rotor and the stiffness of the shaft There are big problems in other aspects, which bring great difficulties to product design. In addition, the performance of the unit is lo...

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Problems solved by technology

[0004] In order to solve the above-mentioned problems existing in the existing pipeline model stage 9, the purpose of the present invention is to provide a pipeline compressor model stage with a flow coefficient of 0.022 and its impeller design method, so that the efficiency of the pipeline compressor product unit can be significantly improved, and the work of the unit can be reduced. consumption

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