A permanent magnet external rotor submersible pump

Abstract

The invention discloses a permanent magnet external rotor submersible electric pump, which is used to solve the problem of low efficiency of the submersible electric pump unit due to the large water friction loss caused by the rotation in water due to the excessive volume of the rotor in the existing submersible electric pump. , including water inlet body, stator, rotor, water outlet body, impeller shell and rotating shaft; with the reduction of the diameter of the rotor, the water friction loss of the present invention is greatly reduced, and the water friction loss is proportional to the fifth power of the outer circumference, thus greatly The efficiency of the improved unit, the stator winding adopts enamelled round copper loose wire, which greatly reduces the insulation thickness of the original water-resistant winding wire, thereby improving the power density of the stator, reducing the volume of the unit, and saving metal consumption. The winding adopts insulating glue potting technology to ensure the safe operation of the motor in water. The rotor of the motor adopts a permanent magnet magnetic steel structure, which improves the performance of the motor and increases the power density of the motor.

Description

Technical field [0001] The present invention relates to the technical field submersible pumps, in particular a permanent magnet external rotor submersible pump. Background technique [0002] Pump is a submersible pump impeller and pump impeller drive motors are working dive into water; an outer circumference of the existing submersible pumps, in the design of the rotor impeller sleeved, because the rotor rotates too large, the rotation of the water water friction loss, so that significantly lower, than traditional submersible pump unit is about 10 percent of the efficiency of the submersible pump unit; turn the motor of the present invention is provided on the inner circumference of the impeller, as the rotor diameter is reduced water greatly reduced friction losses, according to a formula, the water is proportional to the fifth friction loss of the outer circumference side. Thus greatly enhance the performance of the unit. The stator round enamelled copper using discrete wire, g...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low efficiency of the submersible pump unit due to the large volume of the rotor and the large water friction loss caused by the rotation in the water of the existing submersible electric pump, and propose a permanent magnet external rotor Submersible electric pump; with the reduction of the diameter of the rotor, the water friction loss is greatly reduced, and the water friction loss is proportional to the fifth power of the outer circumference, thereby greatly improving the efficiency of the unit. The stator winding adopts enamelled round copper loose wire Compared with the original water-resistant winding wire, the insulation thickness is greatly reduced, thereby increasing the power density of the stator, reducing the volume of the unit, and saving metal consumption. The windings at both ends of the stator adopt insulating glue potting technology to ensure the motor in water. Safe operation, the rotor of the motor adopts permanent magnet magnetic steel structure, which improves the performance of the motor and increases the power density of the motor; the part of the stator winding protruding from the core end is cured with insulating glue and solidified into a ring shape. The inner diameter of the ring, There are 3 ring-shaped passages on the outer diameter respectively, which facilitate water flow through the ring-shaped passages and achieve the purpose of heat dissipation and cooling at the end of the motor winding.

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