Diaphragm metering pumps are devices used for measurement, primarily utilizing specially designed and processed flexible diaphragms instead of pistons. They achieve fluid intake and discharge through the reciprocating motion of the drive mechanism. Their working principle involves changing the volume of the pump chamber by the reciprocating motion of the diaphragm, thereby completing the conveyance of liquid.

Structure and Working Principle

Diaphragm metering pumps typically consist of a motor, transmission system, hydraulic section, and regulating control system. Their cylinder components include the pump head, suction valve assembly, discharge valve assembly, diaphragm, and diaphragm base. During operation, the motor drives the worm and worm gear via a coupling to reduce speed, causing the main shaft and eccentric wheel to rotate, which in turn drives the plunger to reciprocate within the sleeve. During this reciprocating motion, the diaphragm, along with the单向阀 (one-way valve), creates a vacuum within the pump chamber to吸入 (吸入) liquid; when the diaphragm moves forward, the suction valve closes and the discharge valve opens, expelling the liquid.

Application Scenarios and Industries

Diaphragm metering pumps are widely used in fluid measurement and transfer under various special working conditions, particularly excelling in mediums that are thick, corrosive, flammable, or explosive. Their main application fields include:

Chemical Industry: Used for conveying various acids, alkalis, salts, and organic solvents, ensuring the progression of chemical reactions.

Petroleum Industry: Used for conveying raw materials, catalysts, and additives, ensuring the accuracy of chemical reactions. Additionally, it is employed in processes such as water and steam injection.

Industry: Used for measuring and conveying various drug raw materials and formulations.

‌Food Industry: For measuring and transferring berries, beverages, and other food products.

Pros and Cons, Maintenance and Care

The advantages of diaphragm metering pumps include:

High Precision: Advanced structural design and the selection of new materials enhance the lifespan of the diaphragm, with excellent corrosion resistance.

High Reliability: The diaphragm's isolation effect achieves separation between the measured fluid and the driving lubrication mechanism, eliminating the possibility of contamination and leakage.

Excellent isolation: Effectively prevents leakage, ensuring safety.

In terms of maintenance, diaphragm metering pumps should be regularly inspected for diaphragm wear and worn diaphragms should be replaced promptly. Additionally, keeping the pump body clean to prevent contaminants from entering the pump is essential. Regularly checking and replacing seals and lubricants is also necessary.