A diaphragm pump is a positive displacement pump that transports liquids through a flexible diaphragm. Its core component is the diaphragm, which divides the pump into two isolated chambers and achieves fluid suction and discharge through reciprocating motion. The following is a detailed process of its working principle:
Suction phase
Under the action of a driving device (such as an electric motor, pneumatic motor or manual operating device), the diaphragm moves toward the inside of the pump body, causing the volume between the diaphragm and the pump body to increase, forming a negative pressure area. At this time, the inlet valve opens and the external fluid is sucked into the pump body. In this process, due to the negative pressure, the fluid is smoothly introduced into the pump body.
Discharge phase
As the driving device continues to move, the diaphragm moves toward the outside of the pump body, causing the volume between the diaphragm and the pump body to decrease, forming a positive pressure area. At this time, the outlet valve opens and the fluid inside the pump body is discharged. In this process, due to the positive pressure, the fluid is efficiently transported to the target location.
Cycling process
The reciprocating motion of the diaphragm allows the fluid to be continuously sucked in and discharged, thereby achieving efficient fluid transmission. This working principle ensures that the fluid does not come into direct contact with mechanical parts in the pump, making it suitable for handling corrosive, viscous or volatile liquids.