Working Principle Of Pneumatic Diaphragm Pump

Jul 14, 2024

Pneumatic diaphragm pump is a liquid conveying equipment widely used in industrial and commercial fields, with its unique working principle based on air pressure and diaphragm technology. This pump is suitable for various liquids, including corrosive, viscous, particulate matter, or high-temperature liquids. This article will delve into the working principle of pneumatic diaphragm pumps to help understand their value and function in various applications.
1. Pneumatic control: The working principle of a pneumatic diaphragm pump is based on pneumatic control, which uses compressed air to achieve liquid suction and discharge. It usually consists of two diaphragms (also known as diaphragms) located on the suction and discharge sides of the liquid. In the rear chamber of the pump, there is a pair of valves (suction valve and discharge valve) that achieve the coordinated operation of the diaphragm through the control of compressed air.
2. Suction stage: During operation, the pneumatic diaphragm pump first enters the suction stage. When the suction valve of the pump opens, compressed air enters the rear chamber of the pump, causing the diaphragm on the suction side to bend inward. This action creates a low-pressure area that attracts liquid from the inlet into the suction side of the pump.
3. Discharge stage: Once the liquid is sucked into the pump, the suction valve closes and the discharge valve opens simultaneously. At this point, compressed air enters the front chamber of the pump, causing the diaphragm on the discharge side to bend outward. This action discharges the liquid from the front chamber of the pump and sends it to the outlet.
4. Diaphragm collaborative work: In pneumatic diaphragm pumps, the suction and discharge stages are achieved through the collaborative work of the diaphragm. The bending and recovery of the diaphragm allow the liquid to be sucked in and discharged, while preventing liquid backflow. This double diaphragm design enables the pump to efficiently transport various liquids, including liquids with high viscosity, particulate matter, or corrosiveness.
5. Leak free design: Due to the use of diaphragm and pneumatic control in the design of pneumatic diaphragm pumps, there are almost no leakage issues. This makes it very useful in handling toxic, volatile, or expensive liquids, helping to reduce the risk of liquid leakage to operators, equipment, and the environment. In summary, the working principle of pneumatic diaphragm pump is based on pneumatic control and diaphragm technology, making it a multifunctional, efficient, and reliable liquid conveying equipment. Its features include leak free design, suitability for various liquid types, and reliable self suction and discharge capabilities, making it popular in many fields such as chemical engineering, food processing, and wastewater treatment.