Centrifugal pump semi-open impeller with blade top arrangement clearance channels

Abstract

The invention discloses a centrifugal pump semi-open impeller with blade top arrangement clearance channels. Each blade is mounted along the spiral line segment, the blade top surface of each blade isprovided with the multiple clearance channels, the clearance channels are sequentially mounted in a spaced manner in the radial direction of the impeller, the numbers of the clearance channels on theblade top surfaces of all blades are the same, the clearance channels are horizontal grooves formed in the blade top surfaces of the blades, the sections of the horizontal grooves are in semi arc shapes, the middle axes of the clearance channels are located on arcs with the axis hole centers as the circle centers, the middle axes of the same clearance channels, from inside to outside in the radial direction, of the different blades are located on the same circle, the clearance channels are mounted, the jet flow on the channels has the higher flow speed, the leakage flow on the channel-free position is blocked, the leakage flow direction is changed, the change of the blade top clearances from blade inlets to outlets can be adjusted, the blade top clearances can be increased, the inlet andoutlet pressure difference can be relieved, the backflow phenomenon can be weakened, and the hump effect of the pump lift curve is improved.

Description

technical field [0001] The invention relates to the technical field of centrifugal pumps, in particular to a semi-open impeller of a centrifugal pump with clearance passages arranged on the top of the blade. Background technique [0002] A centrifugal pump is mainly composed of a suction chamber, an impeller, and a discharge chamber. Among them, the impeller plays a vital role in the energy conversion process of the centrifugal pump, and the blades on the impeller directly determine the performance of the centrifugal pump, so the design of the centrifugal pump blades is particularly important. [0003] When the semi-open centrifugal pump is running in a small flow process, the gap layer will form complex movements such as large-area bypass flow and leakage vortex, which have an important impact on the internal flow and energy transmission of the pump. At the same time, the impact loss and vortex loss are too large, and the friction loss along the process is too small, which...

AI Technical Summary

Problems solved by technology

When running at the same time, the impact loss and vortex loss are relatively large, and the friction loss along the process is relatively small, which is not conducive to the stability of the performance curve, and it is easy to produce a hump, which has negative effects on the movement of the centrifugal pump such as vibration, noise, and pressure pulsation.

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