Screw pump It is different from the diaphragm pump in use. The diaphragm pump can idle while the screw pump can prevent idling. The rubber sleeve of the screw pump is easily damaged after idling. Although the screw pump has dry suction ability, it is necessary to prevent dry rotation to avoid scratching the working surface.

The screw pump shall be started when the suction and discharge intermittent valve is fully opened to prevent overload or suction.

Assuming that the high viscosity screw pump needs to be started when the oil temperature is very low or the viscosity is very high, it should be started when the suction and discharge valves and bypass valves are fully open, so that the load of the pump when starting is low, until the prime mover reaches an additional speed, the bypass valve will be gradually closed. IMO agent

When the bypass valve is open, the liquid circulates continuously in the pump under the condition of saving. The more oil is circulated, the longer the circulation time is, the more severe the liquid heating is, and even the pump is damaged due to high temperature deformation. It is necessary to pay attention.

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It is necessary for the screw pump to operate in the established direction to produce certain suction and discharge.

During pump operation, pay attention to the pressure, temperature and mechanical shaft seal operation. A small amount of leakage shall be allowed for the shaft seal. If the leakage does not exceed 20-30 seconds/drop, it is considered normal. It is assumed that the pump produces noise during operation, which is often caused by such reasons as too low oil temperature, too high oil viscosity, air entering the oil, coupling misalignment or excessive wear of the pump.

parking

When the sludge screw pump stops, the discharge intermittent valve shall be closed first, and the suction intermittent valve shall be closed after the pump stops completely.

Screw pump has large screw length and poor rigidity, which causes simple bending and constitutes abnormal operation. It is necessary to align the shafting well; The centering operation shall be carried out after the device is positioned to avoid deformation caused by pipeline involvement; When connecting the pipeline, it should be fixed independently to minimize the involvement of the pump. In addition, the standby screw should be suspended and fixed when it is stored to prevent deformation caused by uneven placement. In the third century BC, Archimedes invented the screw rod, which can steadily and continuously lift water to a height of several meters. Its principle is still used by modern screw pumps