A hydraulic model design method of a large-diameter elbow slurry circulation pump

Abstract

The invention provides a method for designing a hydraulic model of a large-diameter elbow slurry circulating pump, which combines the performance parameters of the actual operating point of the circulating pump, the performance parameters of the design operating point, the characteristic parameters of the slurry medium, and the geometric size parameters of the hydraulic model They are connected by a new relational formula, and the performance parameters of the design working point of the circulating pump are determined by the performance parameters of the actual working point of the circulating pump under the condition of conveying slurry medium, and the main geometric parameters of the circulating pump are given. path D , impeller hub diameter D h , the inner diameter of the straight pipe section of the circulating pump D o , the length of the straight pipe section of the circulating pump L 0 , the inclination angle of the inlet side of the rear guide vane α , the axial length of the rear guide vane L 1 and the turning radius of the elbow section R 2 design formula. The circulation pump designed by the invention can realize high-efficiency transportation of large flow of slurry medium, and can also improve the operation stability and cavitation performance of the circulation pump, and is suitable for the fields of salt chemical industry, coal and the like.

Description

technical field [0001] The patent of the present invention relates to a hydraulic model design method of a large-diameter elbow slurry circulating pump, specifically, a hydraulic model design method of a circulating pump suitable for the requirements of large flow rate, high efficiency and stable transportation of slurry medium. Background technique [0002] In the production process of salt chemical industry, coal and other fields, large-diameter elbow slurry circulating pump units are often used to transport slurry media containing a large amount of solid particles. The current hydraulic models of large-diameter elbow slurry circulating pumps are all designed using the traditional model conversion method. This method is based on the hydraulic model design method of clean water axial flow pumps, and is completed through model conversion and appropriate thickening of the blades. The influence of the characteristic parameters of the slurry medium on the performance parameters...

AI Technical Summary

Problems solved by technology

The current hydraulic models of large-diameter elbow slurry circulating pumps are all designed using the traditional model conversion method. This method is based on the hydraulic model design method of clean water axial flow pumps, and is completed through model conversion and appropriate thickening of the blades. The influence of the characteristic parameters of the slurry medium on the performance parameters of the actual working point of the circulating pump is not considered in the design process

Therefore, the actual working point of the slurry circulating pump unit under the condition of conveying slurry medium often deviates from the design working point of its hydraulic model, forming a phenomenon of working condition deviation, resulting in low efficiency and high vibration level of the circulating pump , the impeller inlet cavitation phenomenon is serious, the stability of the rotor parts is also poor, and the shaft seal system of the circulating pump is easily damaged. The above problems seriously reduce the reliability and operating life of the circulating pump unit

Due to the large structural size and supporting motor power of the existing large-diameter elbow slurry circulating pump unit, the impact of working condition deviation is more obvious, and the resulting frequent maintenance costs and component losses are also very large

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