Modular pump unit used in multi-stage pump

Abstract

The invention relates to a modular pump unit used in a multi-stage pump. A multi-stage main shaft in the multi-stage pump is used for driving an impeller to rotate and is provided with a plurality of sets of bearing systems; and single-stage modular shaft units are arranged in series, the stage number of the same pump is not constant and can be quickly and easily increased or reduced according to the requirement of working condition. By the modular pump unit, the design complexity of the main shaft of the multi-stage pump is avoided, the intensity and the hardness of the main shaft are enhanced, the axial force and the radial force applied to the shaft are reduced, so that the service life of the shaft is prolonged, the accident of shaft broken of the multi-stage pump is reduced to a great extent, the modular processing production is realized, and the application range of the multi-stage pump is expanded. Moreover, the modular pump unit has higher promotion value and practical meaning.

Description

technical field [0001] The invention relates to the field of fluid conveying machinery, in particular to a modular pump unit used in multistage pumps. Background technique [0002] The multi-stage centrifugal pump is equipped with more than two impellers connected in series, which can achieve a higher lift compared with a single-stage centrifugal pump; compared with a piston pump, a diaphragm pump, etc., it can pump a larger flow. Multistage centrifugal pumps have high efficiency and can meet the needs of high head and high flow conditions, and have been widely used in petrochemical, electric power, construction, fire protection and other industries. [0003] At present, multi-stage centrifugal pumps usually use a main shaft to drive the impellers at all levels to rotate, and the axial force self-balancing is realized through the balance mechanism and the symmetrical arrangement of the impellers. The main shaft is usually a multi-step shaft section, which makes the main shaf...

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Problems solved by technology

[0003] At present, multi-stage centrifugal pumps usually use a main shaft to drive the impellers at all levels to rotate, and the axial force self-balancing is realized through the balance mechanism and the symmetrical arrangement of the impellers. The main shaft is usually a multi-step shaft section, which makes the main shaft structure too complicated, resulting in structural comparison of stress concentration. Many, resulting in local stress concentration of the spindle, affecting the service life

[0004] In addition, due to the fixed length of the main shaft of the current multi-stage centrifugal pump, the number of stages of the multi-stage pump is fixed, which limits the working conditions of the multi-stage pump to a certain extent.

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