Mixed-flow-pump impeller with working-face oval blade outlet sides

Abstract

The invention relates to a mixed-flow-pump impeller, in particular to a mixed-flow-pump impeller with working-face oval blade outlet sides, and belongs to the field of fluid machines. The mixed-flow-pump impeller with the working-face oval blade outlet sides is composed of a front cover plate, blades and a back cover plate. The blades are connected with the front cover plate and the back cover plate. The mixed-flow-pump impeller is characterized in that each oval blade outlet side is located at the tail end of the corresponding blade of the mixed-flow-pump impeller, the length of each oval blade outlet side is one fifth to one fourth of the length of the whole corresponding blade, the blade working face and the blade back face of each oval blade outlet side are in an oval arc shape, and the eccentricity e of each oval arc is larger than zero and smaller than one. According to the mixed-flow-pump impeller, starting from improving the structures of the blade working face outlet sides, the shapes of an original outlet of the mixed-flow-pump impeller is changed through the oval blade outlet sides, the backflow structure at the outlet is controlled and avoided accordingly, and the hydraulic losses of the mixed-flow-pump impeller are reduced so that the aim of efficient running of a mixed-flow pump can be achieved.

Description

technical field [0001] The invention relates to a mixed-flow pump impeller, in particular to a mixed-flow pump impeller with an outlet edge of an elliptical blade on a working surface, and belongs to the field of fluid machinery. Background technique [0002] Mixed flow pump is a kind of pump type, its performance and structure are between centrifugal pump and axial flow pump, it has the advantages of both centrifugal pump and axial flow pump, and compensates for the shortcomings of both; mixed flow pump has the use of flow, The variable range of the head is large, and the high-efficiency area is wide, so it is widely used in various fields such as farmland drainage and irrigation, power station cooling systems, aerospace and aviation, etc., but it consumes a lot of energy when it is widely used, especially in large pumping stations, so the energy of the mixed flow pump is increased. Performance is of great significance to the national economy and energy saving and emission ...

AI Technical Summary

Problems solved by technology

[0002] Mixed flow pump is a kind of pump type, its performance and structure are between centrifugal pump and axial flow pump, it has the advantages of both centrifugal pump and axial flow pump, and compensates for the shortcomings of both; mixed flow pump has the use of flow, The variable range of the head is large, and the high-efficiency area is wide, so it is widely used in various fields such as farmland drainage and irrigation, power station cooling systems, aerospace and aviation, etc., but it consumes a lot of energy when it is widely used, especially in large pumping stations, so the energy of the mixed flow pump is increased. Performance is of great significance to the national economy and energy saving and emission reduction; since the development, production and application of mixed flow pumps are still far behind centrifugal pumps and axial flow pumps, their advantages have not been recognized by more fields. Flexible use, and the impeller profile of the mixed-flow pump presents a relatively complex twisted shape in space, and the design is difficult. Therefore, the development of a mixed-flow pump with high efficiency, energy saving, advanced structure and stable operation has become a key and difficult problem in its design; after the mixed-flow impeller rotates, The action on the liquid has both centrifugal force and axial thrust, and its motion state is more complicated than that of centrifugal pumps and axial flow pumps. How to make the fluid move more smoothly along the blade profile and reduce the backflow structure in the impeller, thereby reducing the hydraulic force inside the impeller The loss has become a key issue in improving the energy performance of the mixed flow pump

[0003] In recent years, the research on mixed-flow impellers has mainly focused on the influence of changes in the blade tip clearance, the number of impeller blades, the placement angle of the impeller blades, and the thickness of the impeller blades on the hydraulic performance; The impact has been studied. For mixed flow pumps, the impeller is the carrier of energy transfer. It is believed that its mechanism can effectively control the bad flow inside. However, most of the current research starts from optimizing the geometric parameters of the impeller to explore the influence of different parameters on the performance of the pump. However, it failed to control the bad flow in the internal flow structure of the mixed-flow impeller; in order to achieve effective control of the flow in the mixed-flow pump and improve the efficiency and stability of energy transfer and conversion between hydraulic components and fluids, the control of the mixed-flow pump The poor flow structure in the impeller is of great significance to improve the performance of the pump

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