Steady-flow centrifugal pump and design method thereof

Abstract

The invention discloses a steady-flow centrifugal pump and a design method thereof. An efficient running range of a centrifugal pump is narrowed and the service life thereof is shortened due to volume loss caused by a gap of an opening ring of the centrifugal pump, and influence of an axial force on the running of the centrifugal pump. According to the invention, a sealing structure is arranged at an inlet of an impeller, and a balance disc structure is arranged between the rear part of the impeller and a pump shell; due to a zigzag structure, a leakage flow is effectively reduced, the interblending interference effect of the leakage flow at the opening ring, and a main flow is reduced, and the performance of the centrifugal pump is improved; due to the balance disc structure, the automatic balance of the axial force of the impeller is realized; and numerical simulation is carried out on an internal flow field of the centrifugal pump, then analysis is carried out by virtue of an energy gradient theory to obtain distribution of an energy gradient K function of the internal flow field, and then the dimensions of the zigzag structure and the dimensions of the balance disc structure in the sealing structure are optimized until the optimal dimensions are obtained. According to the invention, the reliability and safety of the running of the centrifugal pump are improved, the comprehensive performance of the centrifugal pump is improved, and good economic benefits are achieved.

Description

technical field [0001] The invention belongs to the field of impeller machinery and relates to a centrifugal pump, in particular to a steady-flow centrifugal pump and a design method thereof. Background technique [0002] Centrifugal pumps are general-purpose machinery with a large quantity and a wide range, and are widely used in various sectors of the national economy such as machinery, chemical industry, energy, aerospace and civil construction. Improving the efficiency of centrifugal pumps can make full use of limited energy and improve economic benefits. With the development of science and technology, the application field of pumps is expanding rapidly. According to the statistics of different countries, the power consumption of pumps accounts for about 1 / 5 of the total power generation in each country. It can be seen that the energy consumption of pumps is huge. The level of research and design has an important impact on national economic development, energy conservat...

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Problems solved by technology

[0003] There are various gaps in the centrifugal pump (impeller tip gap, front disc and pump casing gap, rear disc and pump casing gap, mouth ring seal gap and inducer vane top gap, etc.), the flow in these gaps not only reduces the volumetric efficiency , and seriously affect the flow state in the pump and the operation stability of the pump

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