Efficiency issues of submersible pumps and canned motor pumps
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What are the reasons for the low efficiency of submersible pumps and shielded pumps?
Shielded pumps have a shielding sleeve that contains the medium, as well as a shielding sleeve for the motor. If the gap between these two sleeves is too large, it affects the efficiency of the motor, which in turn impacts the overall efficiency of the pump; repair work becomes more difficult as a result
The efficiency of shielded pumps is lower compared to that of centrifugal pumps; the explanation given above is absolutely correct； Compared to surface pumps (horizontal or vertical), submersible pumps consume more power and have lower efficiency; this is mainly due to the long output shaft of submersible pumps, which requires the use of diagonal contact bearings, and in some cases, additional positioning bearings that increase frictional resistance.