Long-life efficient multiple-stage centrifugal pump

Abstract

The invention belongs to the technical field of water pumps, and particularly relates to a long-life efficient multiple-stage centrifugal pump. The long-life efficient multiple-stage centrifugal pump comprises a first water pumping section, a second water pumping section and a middle distance sleeve, wherein the first water pumping section and the second water pumping section are fixedly arranged on a pump shaft in a sleeving manner in the axial direction of the pump shaft, and the middle distance sleeve is arranged between the first water pumping section and the second water pumping section and used for isolating the first water pumping section from the second water pumping section; the direction of impellers in the first water pumping section is opposite to the direction of impellers in the second water pumping section; a water outlet of the first water pumping section is communicated with a water inlet of the second water pumping section; and the number of stages of the impellers in the first water pumping section is one or two larger than that of the impellers in the second water pumping section. As the impellers in the first water pumping section and the impellers in the second water pumping section are distributed in a nonsymmetrical manner, the pressure at the two ends of the middle distance sleeve can be effectively reduced, the leakage amount can be reduced, the volume efficiency can be improved, abrasion can be reduced, and the service life can be prolonged accordingly. According to the long-life efficient multiple-stage centrifugal pump produced by applying the design of the technology, in the occasion where solid particles are conveyed, the efficiency can be improved by at least 5% to 15%, and the service life can be prolonged by 30% to 100%.

Description

technical field

[0001] The invention belongs to the technical field of water pumps, and in particular relates to a long-life and high-efficiency long-life and high-efficiency multistage centrifugal pump. Background technique

[0002] A multistage centrifugal pump is a pump with a wide flow range and a relatively high lift, and has at least two impellers. At present, there are mainly two structural types of multistage centrifugal pumps: multistage centrifugal pumps arranged in series (with balance discs or balance drums), and multistage centrifugal pumps arranged symmetrically at both ends.

[0003] 1) Multi-stage centrifugal pumps arranged in series

[0004] This is the most primitive multistage centrifugal pump, and its structure is a vertical split multistage centrifugal pump, which consists of a front section, a rear section and several middle sections, connected as a whole with four long rod bolts . The number of impellers installed on the pump shaft represents the nu...

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