The submersible pump shuts down frequently
Thread Content
Does the pump trip as soon as the outlet valve opens after the submersible pump is started? Could everyone help analyze the reason?
There is something in the magazine blocking the pump inlet, or the pump shaft is stuck.
First, check the electrical system (such as whether the motor is operating above its current limit, as well as components like protective devices and relays). If there are no issues with the electrical system, then compare the actual power of the pump with the performance curves (or factory test data) to determine whether it exceeds the specified value
Submersible pumps look good when installed, but they are not convenient for maintenance; self-priming pumps are better.
I agree with the view from the 4th floor, but I suggest ruling out the pump as a possible cause first, to check whether it’s due to a different type of liquid being used that exceeds the pump’s design capacity; only then should we consider electrical issues
Disconnect the electrical protection and start the valve; monitor the motor temperature at any time while it is in operation. If the temperature remains stable during normal operation, it is a matter of proper selection of electrical components; whereas if the motor overheats, it is due to mismatched parameters and process requirements for the submersible pump used under heavy load.
It’s not used very often, right? In our factory as well, one submersible pump experienced a similar issue: due to lack of use over time, it was difficult to rotate the pump shaft, and the medium inside was quite dirty, which led to motor protection failures. It’s usually caused by problems with the pump itself; it’s recommended to disassemble it for inspection.
You are referring to the submersible pump located near the sedimentation tank, right? Residue tends to accumulate inside the pump casing, so it is recommended that you perform a backwash.
Submersible pumps have this problem: the outlet valve cannot be opened fully, and the flow rate must be controlled using the outlet valve. It’s not a problem of blockage at the bottom either; blockage at the bottom can cause vibration and abnormal noises in the pump, but it won’t lead to an overload shutdown. Yes. Of course, if the machine shuts down as soon as the outlet valve is opened, it means the impeller back cover is broken. Take it apart and inspect it
A loose impeller back cap or shaft back cap causes the impeller to rub against the bottom partition. Disassemble the impeller and bearings, and remove all the slag accumulated in the slag tank.