Regarding the use of variable frequency drives with water ring vacuum pumps
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The company currently uses water ring vacuum pumps to evacuate equipment, but the vacuum level is too high. Can this level be reduced by lowering the load on the pumps? We want to start with the motor; is it possible to add an inverter? I hope the experts here can give me some advice~
In principle, it is feasible, and control can also be achieved by installing control valves at the inlet and outlet.
Thank you for getting back to me~ Could low rotation speed damage the motor? Because it is not a variable-frequency motor in the first place. . .
Generally, there are no major issues. If the motor needs to operate at a low speed for an extended period after frequency conversion, attention must be paid to heat dissipation; if heat dissipation is inadequate, additional measures should be taken to enhance it.
Although the motor load is reduced, the speed of the vacuum pump decreases as well; this weakens the pump’s ability to draw in water. Meanwhile, the amount of water discharged from the pump outlet remains roughly the same. As a result, the total volume of fluid inside the pump decreases, which can lead to dry grinding and high temperatures at the seal, causing it to melt and resulting in leaks. This is something that needs to be taken into account