Integrated axial-suspension permanent-magnet synchronous shielding pump

Abstract

The invention discloses an integrated axial-suspension permanent-magnet synchronous shielding pump. The integrated axial-suspension permanent-magnet synchronous shielding pump comprises a pump body and a permanent-magnet shielding motor, wherein the permanent-magnet shielding motor is equipped with a winding stator, a pump shaft and a permanent-magnet rotor fixedly arranged on the pump shaft; thehead part of the pump shaft is connected with an impeller in the pump body; the pump shaft is supported by an axial-suspension bearing device on the end part of the permanent-magnet shielding motor; the axial-suspension bearing device comprises a bearing base and a shaft sleeve base; the bearing base is fixed with the permanent-magnet shielding motor, and comprises a static magnetic ring and a bearing; the shaft sleeve base is fixed with the pump shaft, and comprises a movable magnetic ring and a shaft sleeve which is positioned between the pump shaft and the bearing; each of the static magnetic ring and the movable magnetic ring is formed by axially combining a plurality of ring-shaped magnetic rings, wherein polarity of magnetic poles of the inner ring of the static magnetic ring and theouter ring of the movable magnetic ring alternatively changes axially; and polarity of the magnetic poles opposite to the inner ring of the static magnetic ring and the outer ring of the movable magnetic ring is reverse. The integrated axial-suspension permanent-magnet synchronous shielding pump can be utilized to reduce eddy-current loss of a permanent magnet motor, improves efficiency, and utilizes magnetic force of the permanent magnet to completely balance axial force.

Description

technical field [0001] The invention relates to a pump device for conveying fluid medium, in particular to an integrated axial suspension permanent magnet synchronous canned pump. Background technique [0002] At present, canned pumps mostly use ordinary three-phase asynchronous canned motors or electric excitation synchronous canned motors. This kind of canned motors generally consists of a stator, a squirrel cage rotor rotating in the stator, bearings supporting the rotor at both ends, and bearing housings for fixing the bearings. . The rotor and the stator are respectively covered with shielding sleeves, and their efficiency is lower than that of a three-phase asynchronous motor or an electrically excited synchronous motor due to the existence of eddy current losses. Some applications have also begun to consider the application of permanent magnet motors in canned pumps. By eliminating the excitation current, the stator current and stator and rotor resistance losses are ...

AI Technical Summary

Problems solved by technology

[0006] Although the use of permanent magnet motors has improved the reliability and environmental adaptability of canned pumps, there are still two problems to be solved: first, there are still metal shielding sleeves on the stator surface of permanent magnet canned pumps, which will generate high eddy current losses; Secondly, it is difficult to completely balance the axial force of the rotor, which may easily cause wear of the thrust bearing.

Images