What are the differences between internal gear pumps and external gear pumps？

Structure

Internal gear pump: compact structure, small volume, suitable for space limited occasions.

External gear pump: The structure is relatively simple, easy to manufacture and maintain.

Gear meshing method

Internal gear pump: One gear meshes inside another gear, usually consisting of an internal gear and an external gear.

External gear pump: Two gears are engaged externally, and the gear shafts are parallel.

Noise and vibration

Internal gear pump: Low noise and vibration, smooth operation.

External gear pump: There is significant noise and vibration, especially at high speeds.

Flow and pressure

Internal gear pump: uniform flow, small pulsation, suitable for high-pressure applications.

External gear pump: with large flow pulsation, suitable for medium and low pressure applications.