Ejector capable of raising the cavitation performance of centrifugal pump

Abstract

The ejector capable of raising the cavitation performance of centrifugal pump includes successively ejecting inlet, mixing section, diffusion section and ejecting outlet. There are annular cavity around the ejecting inlet, ejecting interface on the annular cavity, several axial inclined ejecting nozzles in axial angle of 10-45 deg distributed homogeneously on the side wall of the annular cavity. Or, the ejecting interface has axial straight ejecting nozzle connected with the ejecting direction coincided with the central axis of the ejector. For high speed centrifugal pump, combined structure of inducing wheel and ejector is adopted, and for common centrifugal pump, ejector is adopted directly in obtaining optimal cavitation performance. The centrifugal pump with ejector may be used in conveying acids, alkalis, salts, alcohols, medicine solution and other liquid medium containing solid particle in the temperature of ¿C200 to +400 deg.c, especially those with strict cavitation performance requirement.

Description

technical field [0001] The invention relates to a fluid conveying machine, in particular to an ejector capable of improving the cavitation performance of a centrifugal pump. It uses injection technology to improve the cavitation performance of centrifugal pumps, and is an organic combination of jet pumps and centrifugal pumps. Background technique [0002] Cavitation damage is an important cause of centrifugal pump failure. Once the cavitation damage occurs in the centrifugal pump, not only the performance of the pump cannot meet the requirements, but also the pumping and vibration damage will occur, so that the pump cannot work normally. With the development of high-speed centrifugal pumps and the variety of easily vaporized media to be transported, higher and higher requirements are put forward for the cavitation performance of pumps. [0003] There are two ways to improve the cavitation performance of the centrifugal pump. One is to increase the NPSH of the device. a ,...

AI Technical Summary

Problems solved by technology

Although the two-stage inducer achieves higher cavitation performance than the single-stage inducer, its working range is narrower than that of the single-stage inducer, and the axial length becomes longer and the structure is complicated.

At the same time, the parameters of some centrifugal pumps are not suitable for the structure of high-speed centrifugal pumps. For ordinary speed centrifugal pumps, the design of the inducer has almost no effect on improving the cavitation performance.

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