Two-stage impeller embedded submersible axial-flow pump

Abstract

The invention relates to a two-stage impeller embedded submersible axial-flow pump. A water absorption chamber, an impeller mechanism and a water outlet chamber which are coaxially communicated in sequence are formed in a shell of the pump; the impeller mechanism is fixed on a revolving shaft; a stator of a motor is arranged on the inner wall of the shell; a rotor is fixed on the outer circumference of an impeller shell; the impeller mechanism is a two-stage impeller; a first-stage impeller is fixed on the revolving shaft corresponding to the water absorption chamber; the first-stage impeller, the rotor and the two-stage impeller form an integral rotating body. The axial length of the submersible axial-flow pump is shortened greatly, and the structure is compact; on the other hand, the distance between two supporting points of the revolving shaft is short, so that the requirements on the intensity and rigidity of the revolving shaft are lowered; under the coaction of the first-stage impeller and the second-stage impeller, the lift of the submersible axial-flow pump can be over 20 meters, so that the application range of the submersible axial-flow pump is expanded greatly; the motor is placed outside a runner, so that the pumping water current of a submersible electric pump is not influenced, and the efficiency of the submersible electric pump is increased.

Description

technical field [0001] The invention belongs to the technical field of submersible electric pumps, in particular to a submersible axial flow pump with built-in impellers. Background technique [0002] Usually, the structure of the submersible axial flow pump with built-in impeller includes a water suction chamber connected coaxially, an impeller hub and a water outlet chamber, and a rotating shaft is arranged in the axial middle of the three. There are 3-5 blades installed on the radial outer circle of the impeller hub to form a first-stage impeller. The motor rotor is fixed on the outer circumference of the annular impeller shell and forms a whole with the impeller shell. The impeller is located in the middle of the motor rotor. The motor rotor is located in the motor stator, and the motor rotor is a ring with the same inner diameter as the impeller outer diameter. The stator of the motor is fixedly arranged in the stator housing 61 , and the two axial ends of the stator h...

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems of low efficiency of the submersible axial flow pump, insufficient use of the axial length, and limited application, the present invention provides a built-in two-stage impeller with a head of more than 20 meters, a wide range of use, and a high utilization rate through structural improvement. submersible axial flow pump

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