FIELD: mechanical engineering; aggressive liquid handling pumps. SUBSTANCE: pump has open type impeller with hub, main disk working blades and impeller sealing blades. Impeller is secured on shaft whose output section is sealed by sealing arrangement located in seal box. Slots are made in main disk of impeller. profile of slots corresponds to profile of working blades. Combined blades are fitted in slots. Width of blades is equal to sum of width of working blade, width of impeller sealing blade and thickness of main disk. Wall of seal box is made of two layers of materials differing in strength and thermal expansion coefficients. EFFECT: enlarged operating capabilities, enhanced reliability of operation. 3 cl, 4 dwg
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