What are the chemical metering pumps?

 

Chemical metering pumps can be divided into many categories according to different classification standards. The following is a summary of the main categories of chemical metering pumps:

 

1. Classification by working principle

 

Plunger metering pump

Working principle: The power comes from the motor, and the rotational motion is converted into the reciprocating motion of the plunger through the crank-connecting rod mechanism, thereby realizing the suction and discharge of the liquid.

 

Features: High metering accuracy, but there will be slight leakage when using packing seals, suitable for industries such as petroleum and beverages.

 

Diaphragm metering pump

Working principle: The medium is sucked and discharged through the reciprocating motion of the flexible diaphragm. The diaphragm isolates the metering fluid from the driving lubrication mechanism to ensure no leakage.

Features: Good sealing and corrosion resistance, widely used in various acid and alkali liquids and water treatment industries.

 

Other types

Piston metering pump: Metering is achieved through the periodic motion of one or more pistons, suitable for high-pressure and high-viscosity liquids.

 

Membrane metering pump: One or more diaphragms are used to achieve metering, and it also has good sealing and corrosion resistance.

 

Gear metering pump: uses one or more pairs of meshing gears to push the liquid, suitable for high-viscosity liquids and high-pressure applications.

Screw metering pump: pushes the liquid from the inlet to the outlet through the rotation of the screw, suitable for high-viscosity liquids and high-pressure applications, and has a higher flow capacity.

 

2. Classification by drive mode

 

Motor-driven metering pump

Most plunger and diaphragm metering pumps use motors as power sources.

 

Electromagnetic-driven metering pump

The electromagnetic diaphragm pump is a typical representative, using electromagnetic force to drive the diaphragm to achieve medium metering and delivery.

 

Pneumatic-driven metering pump

Uses compressed air or other gases as a power source to push the piston or diaphragm to move.

 

3. Classification by special purpose

Hydraulic diaphragm pump

The pressure difference generated by the liquid is used to provide power for the hydraulic diaphragm pump, which is characterized by no leakage.

 

Self-priming metering pump

It has a self-priming function and can automatically suck in liquid without external drainage.

 

Magnetic metering pump

Uses magnetic coupling technology to achieve leak-free fluid transmission, suitable for occasions with extremely high sealing requirements.

 

In summary, chemical metering pumps can be divided into multiple categories according to different standards such as working principle, driving mode and special purpose. In practical applications, it is necessary to select the appropriate metering pump type according to specific working conditions and medium characteristics.

 

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