The first operating mode: The circular motion of the motor, through a mechanical device, causes the diaphragm inside the pump to reciprocate, compressing and stretching the air inside the pump chamber to create negative pressure. A pressure difference is generated at the suction port compared to the external atmospheric pressure. Under the influence of this pressure difference, gas is drawn into the pump chamber and then discharged from the exhaust port.
The second operating mode: The miniature diaphragm pump utilizes the rotation of a screw to draw in and discharge liquid. The central screw of the miniature diaphragm pump is the driving screw, driven by a prime mover, while the two outer screws are driven screws, rotating in the opposite direction to the driving screw. Both the driving and driven screws have double-threaded threads. Due to the meshing of the screws and the tight fit between the screws and the inner wall of the bushing, one or more sealed spaces are created between the suction port and the discharge port of the miniature diaphragm pump. As the screw rotates and meshes, these sealed spaces are continuously formed at the pump's suction end, sealing the liquid in the suction chamber inside. The liquid is then continuously pushed from the suction chamber along the screw axis to the discharge end, continuously discharging the liquid enclosed in each space. This is similar to a nut being continuously pushed forward as the screw rotates. This is the basic working principle of a miniature diaphragm pump.