The ZCQ series self-priming magnetic pump adopts an external mixed axial return water pump body structure design. The pump body is composed of a suction chamber, a storage chamber, a volute shell, a reflux hole, a gas-liquid separation chamber, and other parts (see the schematic diagram for the structure). After the pump is started, under the action of centrifugal force, the remaining liquid in the suction chamber and the air in the inlet pipeline are stirred by the impeller to form a gas-liquid mixture. The mixture enters the gas-liquid separation chamber through the volute shell, and as the flow rate decreases, it causes gas-liquid separation. The air is discharged from the pump outlet, and the liquid returns to the pump chamber through the reflux hole. After multiple cycles, the air in the inlet pipeline is gradually emptied, forming a certain degree of vacuum in the pump chamber. The liquid in the low-level tank flows towards the pump inlet under atmospheric pressure, achieving self-priming. This series of self-priming processes is automatically completed by the pump within 1 to 3 minutes of start-up, without manual intervention. When the liquid fills the pump inlet pipeline and pump chamber, the pump group It automatically enters the normal operating state. The driving device of the magnetic self-priming pump adopts an active magnetic coupling directly installed on the motor shaft, indirectly driving the impeller on the rotor combination to rotate through magnetic coupling, and the pump chamber is completely sealed without leakage.