The screw pump is a positive displacement pump with a unique structure, which is mainly composed of a drive motor and a reducer, a connecting rod and a connecting rod box, a stator, and a rotor. When working, the rotor is driven by the motor and rotates in a planetary manner in the stator. The cooperating elastic bushings of the rotor and the stator form several sealed cavities that do not communicate with each other. Due to the rotation of the rotor, the sealed cavity moves in the axial direction from the suction end to the discharge end, and the medium is continuously transported from the suction end to the discharge end in the cavity.
The use method and process of the screw pump are as follows:
Open the suction and discharge valves fully before starting the pump.
1) When the pump is started for the first time or the pump that has been sealed for a long time is used again, the input liquid should be injected, and the pump shaft should be rotated several times with the help of auxiliary tools, so as not to damage the stator. The pump cannot be started without liquid, which will damage the stator;
2) Start the motor for a moment, check the rotation direction of the pump, and confirm that it is consistent with the direction marked on the pump casing before starting to run;
3) After starting the pump, observe whether the readings of the pressure gauge and vacuum gauge meet the requirements, pay attention to the operation of the pump such as sound and vibration, and immediately stop and check if it is abnormal.
4) During the initial start-up process, the allowable initial leakage of the packing seal (especially PTFE) should be adjusted evenly during the 15 minutes of the initial start-up process. About 1/8 of a turn at a time, adjust to the lowest leakage. If the temperature of the stuffing box increases sharply and the leakage decreases sharply, the nut should be loosened immediately, and the above process should be repeated;
5) When the pump is in normal operation, the flow is controlled by adjusting the speed.
