Intelligent multistage centrifugal pump

Abstract

The invention discloses an intelligent multistage centrifugal pump. The intelligent multistage centrifugal pump comprises a pump body, and an outer shell; a runner is formed between the outer shell and a guide blade support body; a connector is connected with a pump shaft; an impeller is inserted in the pump shaft for rotation to suck in a fluid from an inlet for pressurization; guide blades are accommodated in the guide blade support body; liquid pressurized through the impeller is collected to reduce the flowing speed, and is drained through an outlet; a variable frequency motor comprises a motor body and a motor shaft axially connected with the connector, and further comprises a variable frequency controller integrally arranged in the motor body; and the variable frequency motor drives the pump shaft to rotate through the motor shaft and the connector. The variable frequency motor is integrated by a frequency converter and the motor body, so that the equipment size is reduced, the product manufacturing cost is saved, the mounting space is saved, the efficiency under part working conditions of a multistage centrifugal pump system is improved, and the energy consumption of a water pump system is reduced.

Description

technical field [0001] The invention relates to the fields of industrial liquid transportation and urban water supply and drainage, in particular to an intelligent multistage centrifugal pump driven by a variable frequency motor integrated with a frequency converter motor. Background technique [0002] Multi-stage centrifugal pumps are used in the transportation of industrial liquids and urban water supply and drainage, pressurized water supply for high-rise buildings, garden sprinkler irrigation, fire pressurization, long-distance water supply, heating, bathrooms, etc. delivery etc. [0003] At present, during the use of multistage centrifugal pumps, most of them work at power frequency (50Hz). In practical applications (such as domestic water supply for buildings), the pump system does not need to work at the rated flow rate and rated head in most of the working hours, but needs to work under partial load conditions (that is, the flow required by the actual pump system is...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, the object of the present invention is to provide a multistage centrifugal pump equipped with a variable frequency motor integrated with a motor frequency converter. The motor and the frequency converter are optimized as a system, while considering the optimal design points of the multistage centrifugal pump. Taking into account the partial load condition of the variable frequency motor, it improves the efficiency of the multistage centrifugal pump system under partial working conditions, improves the overall efficiency of the variable frequency water pump system, and reduces energy consumption, thereby reducing the operating cost of the variable frequency multistage centrifugal pump system and improving the efficiency of the variable frequency centrifugal pump system. The efficiency of the pump system under some working conditions reduces the operating cost; on the other hand, because the frequency converter and the motor are integrated, the volume of the control cabinet can be reduced, and even the frequency conversion control cabinet can be removed in the case of single pump control, saving product manufacturing costs and saving installation space

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