Decline in the efficiency of the circulating water pump
Thread Content
The liquid delivery volume of the circulating water pump decreases, and the outlet pressure also drops. Due to the poor quality of the circulating water, the impeller has also worn out; however, the problem persists even after replacing the impeller. I would like to ask the experts here for advice. Is there wear inside the pump casing? Additionally, there is no sealing ring between the pump impeller and the pump inlet.
It is likely mainly due to severe wear of the pump casing. Additionally, the gap between the impeller and the pump casing is also important.
Why wasn’t a thorough inspection carried out when replacing the impeller? The inlet pipeline must be unobstructed; check for cavitation, and ensure that the gap between the impeller and the pump casing is not too large.
Is it an open impeller or a closed impeller? Mainly consider whether there is any leakage!
In the case described by the poster, I also think it’s likely that the internal pump casing has worn out, which has increased internal leakage and led to a decline in performance. I wonder if the experts have a better explanation for the absence of classes?
The worn pump casing causes severe backflow inside the pump, resulting in a reduced stroke
Check and confirm the gap of the mouth ring! ! ! The gap should be fine as it is within the required range. Circulation water pumps all have that same characteristic – their pump casings are quite rough
If the flow rate decreases, the outlet pressure should increase. If both the flow rate and the outlet pressure decrease, it is likely that the flow rate going into the system has decreased; I think there might be backflow from the outlet to the inlet, so that valve should be checked. Also, may I ask what the current of the motor is – is it increasing or decreasing? An increase in the gap of the mouth ring also affects efficiency; the flow rate and head decrease, but the motor current increases as a result.
Thank you to all the experts. This pump doesn’t have an outlet ring, and current was indeed not taken into account; I’ll go back and check it carefully.
There is gas inside the pump or in the suction pipe; debris is blocking the pump or the pipes; the rotation direction of the pump is incorrect; the impeller is not aligned properly
Reason: 1. The filter screen at the pump inlet is clogged； ⒉Blockage in the pump inlet pipeline ； Find the location and clean it up promptly.
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