This paper presents new construction of a submersible pump which is highly efficient due to the new solutions for flow channels. It includes the results of laboratory tests of the pump of the new construction. It also presents the results of numerical calculations of liquid’s movement in the flow channels of the pump, comparison of computing characteristics and characteristics measured in the laboratory.and an analysis of the essential parameters of the pump’s work which transgression could become a danger for the pump. In case of the danger the security system turns off the engine temporally or permanently.

This article presents the new construction of a centrifugal impeller pump which supplies the cooling system in coal power plants. The article also shows the history of producing this kind if pumps for unified 125 MW and 200 MW power units which dominate in Poland. The process of numerical analysis and conventional calculations leading to the improvement of qualities of the flowing system exceeding literature indicators are presented. The article shows the problems which appeared during assembling the pump in its target workplace. The results of the measurements of the pump flowing system in its target workplace are presented.

The article presents the concept of a new circulation pump for low power heating or cooling system, dedicated to systems where it is necessary to ensure a slight liquid flow during periods of operation at a significantly low efficiency of the systems. The assumption for the construction of the new pump was the possibility of its installation in the pipeline axis. The proposed prototype design includes the application of a patented solution to relieve the axial force acting in a flow system [1,2]. Additionally, a new permanent magnet DC motor designed and manufactured for this pump was used. The design of the pump takes into account the requirement of maximum silence, which results from its intended use in close proximity to human habitation. The design of the pump has been tested numerically. The results of numerical tests are presented. The pump was made in the rapid prototyping technique in a 3D printer. The pump was built into a dedicated test stand with measuring instruments verified in terms of the quality of measurements. A series of measurements was made on the basis of which the flow characteristics of the pump were determined. During the research, risks for the operation of the new structure were identified, which will be taken care of in a further stage of the research, and the structure, after removing the defects, will be directed to production [3].

The article presents a new construction of a submersible pumping engine where new original solutions in flowing system and control system where introduced It let obtain high efficiency and fulfill user's expectations. The article also contains experiments of the new pumping engine and their results. The results of numerical analysis of the movement of liquid in flowing channel is described and the analytical characteristics are compared with ones measured in laboratory. The work also presents the problems with constructing, research and certification of new submersible pumping engine which construction fulfils ATEX requirements for machines working in explosive conditions areas AbstraktČlánek představuje novou konstrukci ponorného čerpadla, kde byly představeny nové originální řešení v proudícím systému a řídicím systému. Toto řešení dovoluje dosáhnout vysoké účinnosti a plní uživatelské očekávání. Článek obsahuje experimenty nového čerpadla a jejich výsledky. Je popsán výsledek numerické analýzy pohybu kapaliny v průtokovém kanálu a porovnány analytické vlastnosti s měřením v laboratoři. Práce také představuje problémy s konstrukcí, výzkumem a certifikací nového ponorného čerpadla, který konstrukčně splňuje ATEX požadavky pro stroje pracující ve výbušných podmínkách.