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Design of a hydraulic system for long-distance water transport
Dobrovolný, Martin ; Kozubková, Milada (referee) ; Veselý, Jindřich (referee) ; Pochylý, František (advisor)
The Ph.D. thesis aims to design a hydraulic system for long-distance water transport by the serial connection of axial pumps. Specifically, there is presented an analysis of the axial centrifugal pump prototype, which was tested. The prototype has a specific design. An asynchronous electric motor with a hollow-shaft rotor is used. The pump's impeller is pressed into the hollow shaft. Some advantages follow from the design compared to common pumps and pumping stations. For example, it is possible to designate a compact design of a pump and lower pressure load of pipe, so the elastic material for the pipe's wall can be used. However, the main disadvantage of this design is related to the large rotating diameter, where the pump's seals are located. It leads to quite large mechanical losses on seals and in the context of relatively small hydraulic power also to small efficiency. Therefore one part of the Ph.D. thesis is focused on the pump's seal. The result of the work is a new design of the mechanical face seal with a spiral grooves. The seal was manufactured and subjected to the test. During the testing of the prototype axial pump, it was also revealed inappropriate hydraulic design. Therefore it was necessary to redesign the impeller and guide vanes of the pump.
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