Study On The Design Methods And Shaping Technologies Of The Stamped-welded Centrifugal Pump's Impeller

Since the 1970s, stamping and welding technologies have been used in the manufacture process of the pumps. Compared with the mold centrifugal pump, the stamped-welded pump has many advantages; and it is the substitute of the small and medium-sized centrifugal pump. As a new product, this kind of pump has progressed greatly overseas in the last decades, and a lot of researches have also been done in our country, many achievements have been obtained. But further researches on the design and molding methods of the pump still need to be done. Based on the status, the study on the design methods on stamped-welded centrifugal pump was done, and some new methods on the manufacture technology of impeller were attempted. The main work is outlined hereinafter:1．Based on the former research, and starting with the characteristics of stamped-welded centrifugal pump, a pump was designed with the main parameters: Q=50m~3/h, H=50m, n=2900r/min, n_s=66, the design process and the hydraulic model of the impeller were given, and the reasonable impeller structure which can meet the demands of hydrodynamic performance and molding technologies synchronously was determined.2．The inner flow of impeller was simulated using the software FLUENT, and some results such as the distribution of pressure and velocity were obtained. Compared with the experiment results, the rationality of the impeller design methods and its structure is demonstrated. And the head and hydraulic efficiency of the pump were forecasted on the basis of those simulation results.3．According to the demands of the component drawings, the stamping technology of the impeller including shroud, vans and hub was established, and some problems appearing during the manufacture process were analyzed and solved.4．Whereas the disadvantages of the current welding methods, laser weld was adopted to joint parts of the impeller, the laser weld technology of the impeller was established, which includes choosing the welding equipment and fixing on welding parameters, and the metallographic tests for impeller welded was made to exam the microcosmic structure of welding.This research can offer some helpful references for the design methods and manufacture of the centrifugal pump.