Sectional type multi-stage centrifugal pump and adjustable guide vane devices thereof

Abstract

The invention discloses a sectional type multi-stage centrifugal pump equipped with adjustable guide vane devices. The sectional type multi-stage centrifugal pump comprises a suction section, a primary impeller, the adjustable guide vane devices, a middle section, secondary impellers, a discharge section, a pump shaft, a shaft sleeve, impeller spacer rings, a sliding bearing, a rolling bearing, a flexible connector and an external prime mover, wherein the impellers are connected and assembled on the pump shaft through keys; the adjustable guide vane devices are assembled in the middle section; the adjustable guide vane devices collect liquids pressurized by the impellers and reduce the flow velocity, and the liquids are discharged from the discharge section and sent into a pipeline system. According to the adjustable guide vane devices, the angles of guide vanes can be adjusted according to the pressure at a water pump outlet, so that the water pump operates at an efficiency optimized working point under any working condition, the hydraulic efficiency of the water pump under the working condition of part load or overload is improved, the operation efficiency of a water pump system, especially a variable-frequency or variable-flow water pump system, is improved, and the energy consumption of the water pump system is saved.

Description

technical field [0001] The invention relates to the field of liquid transportation such as industry and agriculture, in particular to a segmented multistage centrifugal pump and an adjustable guide vane device. Background technique [0002] Segmental multistage centrifugal pump is to install multiple impellers on a shaft to work in series, and the number of impellers on the shaft represents the number of stages of the pump. The segmental multistage pump structure is generally divided into a water inlet section, a middle section (the number of the middle section is the number of impellers minus 1) and a water outlet section, and each section is connected into a whole with tension bolts. The suction inlets of the segmental multistage centrifugal pumps are arranged in the same direction. The liquid flows out from the previous stage impeller and enters the inlet of the next stage impeller through the guide vane, so that the energy increases step by step, and finally flows out ...

AI Technical Summary

Problems solved by technology

In the field of water pump systems, the commonly used method is to use frequency conversion technology. Frequency conversion technology has made a great contribution to the energy saving of water pump systems. However, the design of water pumps is optimized according to the rated point (that is, the efficiency of the water pump is the highest at the rated flow rate). When the pump deviates from the rated point, that is, under partial load and overload conditions, its efficiency is low, and the farther it deviates from the rated flow, the more its efficiency drops

[0005] The purpose of the present invention is to propose an adjustable guide vane device and a new type of section-type centrifugal pump using the adjustable guide vane device for the technical defects of low efficiency under partial load and overload conditions of the existing segmental multistage centrifugal pump. Segment multistage centrifugal pump

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