Regarding shielded pumps and submersible pumps

They are all centrifugal pumps, but their structures and uses are completely different. The motor protection rating of submersible pumps is IP58, while that of canned motors is generally IP55. The definition of the motor protection rating is as follows: The IP classification system uses a number to indicate the level of protection provided by the enclosure against impacts, as well as dust and water intrusion. 　First digit: Level of protection against solid objects entering. 0: No protection; 1: Protection against objects larger than 50 mm (such as hands); 2: Protection against objects larger than 12 mm (fingers); 3: Protection against objects larger than 2.5 mm (tools or wires); 4: Protection against objects larger than 1.0 mm (wires or thin rods); 5: Protection against the intrusion of dust that can cause harm; 6: Dust-tight. Second digit: Level of protection against water intrusion. 0: No protection; 1: Protection against droplets (such as condensation); 2: Protection against droplets with an angle of inclination of less than 15°; 3: Protection against splashed water with an angle of inclination of less than 60°; 4: Protection against water splashes from all directions; 5: Protection against water jets from all directions; 6: Protection against water pools or high-pressure water jets; 7: Protection against water intrusion when submerged at a depth of 150 mm–1 m; 8: Suitable for continuous submersion in water. 　Therefore, submersible pumps can be used while submerged in water, whereas shielded pumps are generally used in applications where leakage prevention is crucial.

Submersible pumps may seem somewhat similar to canned pumps, but in reality they are completely different. A submersible pump is essentially a centrifugal pump with an internal seal, while a canned pump is a sealless pump equipped with a protective casing. For the cross-sectional view, refer to the following post: http://bbs.hcbbs.com/viewthread.php?tid=142612&page=1&extra=page%3D1. This post was last edited by zxz017 on 2008-1-18 at 19:53.]