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 operating principle involves changing the pump chamber volume through the reciprocating motion of the diaphragm, thereby completing the transportation of liquids.

Structure and Working Principle

Diaphragm metering pumps typically consist of a motor, transmission system, hydraulic end, 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 one-way valve, creates a vacuum in the pump chamber to draw in liquid. As 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 primary application fields include:

Chemical Industry: Used for conveying various acids, bases, salts, and organic solvents to ensure the chemical reactions proceed.

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

Industry: For measuring and conveying various drug raw materials and formulations.

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

Advantages and Disadvantages, Maintenance and Care

The advantages of diaphragm metering pumps include:

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

High Reliability: The isolation function of the diaphragm achieves separation between the measured fluid and the driving lubrication mechanism, thereby avoiding 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 membrane wear and worn membranes should be replaced promptly. Additionally, keeping the pump body clean to prevent impurities from entering the pump is essential, as well as regular inspection and replacement of seals and lubricants.