Diaphragm metering pumps are devices used for measurement, primarily utilizing specially designed flexible diaphragms in place of pistons. They achieve fluid intake and discharge through the reciprocating motion of the driving mechanism. The working principle involves changing the pump chamber volume through the reciprocating motion of the diaphragm, thereby completing the liquid transfer.

Structure and Working Principle

Diaphragm metering pumps typically consist of a motor, transmission system, hydraulic section, and control system. The cylinder components include the pump head, suction valve assembly, discharge valve assembly, diaphragm, and diaphragm base. During operation, the motor drives a worm and worm gear through a coupling to reduce speed, causing the main shaft and eccentric wheel to rotate, which in turn drives the plunger to reciprocate within the guide tube. In the reciprocating motion, the diaphragm, along with the plunger, forms a vacuum in the pump chamber through the action of a one-way valve, suctioning in 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 transporting various acids, bases, salts, and organic solvents, ensuring the progression of chemical reactions.

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

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

‌Food Industry: For measurement and transfer of 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 isolation effect of the diaphragm achieves isolation between the measured fluid and the driving lubrication mechanism, thereby avoiding the possibility of contamination and leakage.

Excellent insulation: Effectively prevents leakage and ensures safety.

In maintenance, membrane metering pumps should be regularly inspected for membrane wear and worn membranes should be replaced promptly. Additionally, keeping the pump body clean and preventing contaminants from entering the pump is crucial. Regularly checking and replacing seals and lubricants is also necessary.