Resesrch On Flow Passage Components And Pump Chamber In The Stamping And Welding Centrifugal Pump

The flow passage components of a stamping and welding centrifugal pump include fasten nut and shaft sleeve, in addition to impeller. Stamping and welding centrifugal pump chamber has relatively large volume, in which there are local hydraulic losses, and lots of friction losses between fluid and parts surfaces. So the structures of pump chamber and flow passage components are the important factors that influence the pump hydraulic performance. Up to now, the study of efficiency losses in stamping and welding centrifugal pump are concentrated on the design methodology for impeller or guide vane’s molded lines, which are based on mold centrifugal pump. There is little research available on the pump chamber structure and flow passage components.In order to optimize pump structure, improve hydraulic performance and advance energy saving, the MDP64-20stamping and welding centrifugal pump is simulated and tested in this paper based on a lot of different design methods. The main research works and conclusions are showed as following:1. Searched for a wealth of literatures about stamping and welding centrifugal pump, and summarized the related content of pump chamber and flow passage components likes fasten nut.2. The technology about studying flow field in centrifugal pump based on CFD simulation was introduced systematically, including three-dimensional modeling by Pro/E, mesh generation by Gambit and the process of Fluent setting. And then the hydraulic model of MDP64-20stamping and welding centrifugal pump was simulated by the CFD technology mentioned previously.3. Throat width of pump chamber was used as investigated parameters. Set up four analyze groups by parameters of throat width. Performance curves of the original centrifugal pump model and all pump models with different plane-clapboard were predicted based on CFD simulation results. At last, an optimum range of chamber throat width was determined. 4. With the same throat width, these four plans of plane-clapboard, curved surface-clapboard, L-clapboard and profile Line-clapboard were described in detail. After contrast analyzing and calculating contrapose to these different pump chamber structures by CFD, the influence of different chamber structures on performance of centrifugal pump was investigated and a set of optimized chamber structure model was determined at last.5. Based on the optimized chamber structure, three plans of impeller fasten nut were set up. Performance curves of these three pump models modified with different fasten nut sizes were predicted based on CFD simulation results.6. For purpose of checking the reliability of CFD simulation, a group of pump performance tests about model pump and other three pumps with optimized size were carried out. The comparison shows that both of head and efficiency can be predicted based on CFD simulation with acceptable accuracy.