What to do if the self-priming pump encounters a malfunction？

The self-priming pump is a centrifugal pump with a certain suction capacity under suction conditions. It mainly combines the principle of gas-liquid mixing with the special structure of the pump to suck the gas, which can be achieved in the suction line of the pump. A certain degree of vacuum to achieve the centrifugal function.

This article contains the following:

• The reason for the loud noise of the self-priming pump

• The self-priming pump cannot start

• Self-priming pump heating reasons

• Part of the problem of the motor

The reason for the loud noise of the self-priming pump:

The self-priming pump has insufficient head, and the pump cannot suck the water in the well, which will cause the loud noise of the pump. Solution: Change the actual Yang Chengzu high-power pump to solve the problem of loud sound of the pump. Reason: The pipeline from the water level of the well to the pressure tank has air intake or air leakage at the interface, which causes air to enter, causing the pump to sound. Solution: Re-check whether there is any air leakage in the pipeline and interface of the well level to the pressure tank, and then reconnect.

The self-priming pump cannot start.

First, check the power supply: whether the connection of the connector is firm; whether the switch is tightly connected; whether the fuse is blown; whether the three-phase power supply is missing. If there is an open circuit, poor contact, blown fuse, or phase loss, the cause should be identified and repaired in a timely manner. Secondly, check whether it is a mechanical failure of the pump itself. Common reasons include: the packing is too tight or the impeller and the pump body are blocked by debris; the pump shaft, bearing, and leakage reduction ring are rusted; the pump shaft is severely bent. Remedy: loosen the packing and dredge the water trough; disassemble the pump body to remove debris and rust; remove the pump shaft calibration or replace the new pump shaft

Self-priming pump heating reasons

Bearing damage; rolling bearing or bracket cover clearance is too small; the pump shaft is bent or the two shafts are not concentric; the tape is too tight; lack of oil or poor oil quality; the balance hole on the impeller is blocked and the impeller is lost Balance, increase the thrust to one side. Remedy: replace the bearing; remove the rear cover, install a gasket between the bracket and the bearing housing; investigate the pump shaft or adjust the concentricity of the two shafts; properly loosen the tightness of the tape; add clean butter, butter accounts for the bearing About 60% of the inner gap; remove the blockage in the balance hole.

Part of the problem of the motor

No response after connecting the power supply. Reason: Most of them are caused by short circuit of power plug, power lead and motor winding. Problem: It is difficult or impossible to start, and it is accompanied by a "buzzing" sound. Remedy: use a small bamboo piece to quickly move the fan blade in the direction of operation during maintenance. If the motor runs quickly, it means that the starting capacitor or the starting winding is damaged. Replace the capacitor with the same capacity or repair the starting winding. If the motor is stuck, it is mostly the motor And the mechanical failure of the pump head, such as bearing damage, impeller stuck etc. Problem: The motor can run, but the speed is slow, and the case is overheated and has a burning smell. Remedy: Most of them are caused by short circuit of the motor windings. The motor should be disassembled and repaired by welding, jumper wire, isolation, rewinding and other measures according to the damage. Problem: During operation, there is a lot of noise and vibration. Remedy: Most of the bearings are damaged or the bearing and the housing are not properly matched. The motor needs to be disassembled for inspection. If the bearing is damaged, it should be replaced. If the bearing runs outside, the matching surface of the pump casing can be treated with chisel; if the bearing runs inside Round, can be used to treat the worn parts of the motor shaft with chisel, if the wear is serious, it should be repaired by surfacing first and then turning.

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