Problems with submersible pumps? ? ? ? Could you help analyze it? ? ? Thank you
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I remember once, with the submersible pump (used for aeration) in the fish tank, I took it out into the air; in less than a minute, I noticed a burnt smell – had it caught fire? ? ? How to understand it? ? A friend explained that there is no cooling system, but it shouldn’t burn out in just a minute, right? ? I really don’t understand. Also, during our last attempt to pump water out of the tank, why was it necessary to keep an eye on the liquid level? What would happen if the liquid level dropped to zero while the pump continued to operate? ? Can this be explained as idling? Electrical energy = mechanical energy (kinetic energy) + internal energy. If the rotation of the pump is considered to represent kinetic energy, the liquid carries away some heat; once the liquid is exhausted, friction within the pump generates more heat, and since this heat cannot be dissipated, the motor will burn out. Did the current suddenly increase and the motor trip after there was still no liquid? ? ? Is my understanding correct? Could a Haiyou help analyze this?
It’s because the submersible pump is cooled by water; it can’t be cooled if it’s not submerged in water
You said: \"The liquid takes away some of the heat; once the liquid is exhausted, friction in the pump still generates heat, and without proper cooling, the motor will burn out.\" ”That’s right
Heat is not generated only by the pump; submersible pump motors lack fan cooling, and even if the pump is pumping fluid, the motor will eventually overheat and trip! Unless it’s specially designed! !
One minute really won’t cause the motor to overheat, but if you pump it empty… hahaha. It’s not just a matter of calories! Centrifugal pumps must never be run dry! Centrifugal pumps must never be run dry! Centrifugal pumps must never be run dry! Centrifugal pumps must never be run dry! Important things are said three times! ! Unless the corresponding design is done!
Idling without cooling – it’s bound to overheat
Hehe, not understanding the principle behind it and only starting to learn about it when something goes wrong – that’s not bad either. The principle of submersible pump motors is different from that of motors used in normal atmospheric conditions. I found a picture that’s a bit small; it should be clear enough to allow for a proper explanation.