Six Key Functions and Ten Advantages of Air Diaphragm Pumps

Title: “Six Key Functions of Diaphragm Pumps”

1. Automatic Flow Adjustment with Back Pressure: Diaphragm pumps, powered by air, automatically adjust their flow in response to changes in back pressure (exit resistance). This makes them suitable for handling fluids with medium to high viscosity. In contrast, centrifugal pumps have fixed working points calibrated for water. When used with slightly higher viscosity fluids, they require additional equipment like gearboxes or variable frequency drives, leading to increased costs.
2. Safe and Cost-Effective in Hazardous Environments: Diaphragm pumps are reliable and cost-effective for use in flammable or explosive environments, such as in the transportation of fuels, explosives, or powders. Firstly, they do not generate sparks after grounding. Secondly, they produce no heat during operation, preventing overheating. Lastly, the fluid remains at a stable temperature due to minimal agitation.
3. Ideal for Harsh Worksite Conditions: In challenging environments like construction sites and industrial wastewater discharge, where impurities and complex compositions in wastewater can lead to clogs in pipelines, diaphragm pumps offer a solution. They can handle particles and have adjustable flow rates, automatically stopping when blockages occur until cleared.
4. Compact and Mobile Design: Diaphragm pumps are small in size and easy to move, requiring no foundation. They take up minimal space and are easy and cost-effective to install. They can serve as portable material conveying pumps.
5. Complete Isolation from Hazardous or Corrosive Materials: Diaphragm pumps effectively isolate the material being pumped from the external environment, making them suitable for handling hazardous, corrosive, or volatile substances.
6. Suitable for Conveying Chemically Unstable Fluids: Diaphragm pumps can be used to transport fluids with relatively unstable chemical properties, such as photosensitive materials or coagulated liquids. This is because diaphragm pumps exert low shear forces, resulting in minimal physical impact on the material.

Title: “Ten Advantages of Diaphragm Pumps”

1. Wide Flow Range with Excellent Passability: Capable of handling particles up to 10 millimeters in size, diaphragm pumps exhibit minimal wear when pumping slurry or impurities.
2. No Priming Required: Diaphragm pumps can achieve high suction lifts of 5-9 meters (dry or wet) without the need for priming water. They can achieve a head of up to 70 meters with an outlet pressure of ≥7 bar.
3. No Rotating Parts or Seals: Diaphragm pumps do not have rotating components or shaft seals, ensuring complete separation between the pumped medium and the moving parts. This prevents leaks of toxic, volatile, or corrosive substances, ensuring both environmental and personal safety.
4. Stepless Adjustment of Head and Flow: The head and flow of diaphragm pumps can be adjusted continuously by controlling the air valve opening (pressure adjustment between 1-7 bar).
5. Submersible Operation: Diaphragm pumps can operate submerged in the medium.
6. Safe Operation in Flammable or Explosive Environments: Diaphragm pumps can be used safely in areas prone to ignition or explosion risks, as they do not require electricity.
7. Simple Structure and Few Vulnerable Parts: With a straightforward design and minimal vulnerable components, diaphragm pumps are easy to install and maintain. The pumped medium does not come into contact with the air valve, connecting rod, or other moving parts, reducing performance degradation due to wear.
8. Convenient Operation and Reliable Work: Starting and stopping the pump only requires opening and closing the gas valve. Even if the pump operates without medium for an extended period due to unforeseen circumstances or sudden shutdown, it will not be damaged. It has self-protective capabilities and will automatically restart once the load returns to normal.
9. No Need for Lubrication: Diaphragm pumps do not require oil lubrication, and even if operated without a medium, it has no adverse effects on the pump. This is a significant feature of this type of pump.
10. Capable of Pumping Viscous Liquids: Diaphragm pumps can handle liquids with higher viscosity (below 20,000 centipoise).

Selecting a diaphragm pump is a meticulous task that requires both solid theoretical knowledge and extensive practical experience. The choice not only aids in optimizing the PID parameters of the control loop for better control effects but also significantly extends the lifespan of the diaphragm pump. It should be adapted to specific conditions and is by no means static. Continuous reflection and innovation in practice are necessary, especially with the application of integrated electromechanical technology, computers, and digital information technology, which have improved the structural functionality of diaphragm pumps, providing great convenience for their selection.