Intelligent multistage centrifugal pump

Abstract

The invention discloses an intelligent multistage centrifugal pump, which comprises: a pump body, an outer casing, and a flow channel between the outer casing and a guide vane support body; a coupling is connected with a pump shaft; The fluid is sucked in from the inlet and pressurized; the guide vane is accommodated in the guide vane support body, and the liquid pressurized by the impeller is collected to reduce the flow rate and discharged through the outlet; the frequency conversion motor includes: the motor body and the motor connected to the coupling in the axial direction The shaft also includes a frequency conversion controller integrated in the motor body, and the frequency conversion motor drives the pump shaft to rotate through the motor shaft and the coupling. The frequency conversion motor of this invention is integrated with the frequency converter and the motor body, which reduces the volume of the equipment, saves product manufacturing costs, saves installation space, improves the efficiency of the multi-stage centrifugal pump system under some working conditions and reduces the water pump system. energy consumption.

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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