What is the difference between gear pump and blade pump

Gear pump and vane pump are two common hydraulic pumps, which have certain differences in structure, working principle, performance characteristics and application occasions. Here's a breakdown of the differences:
​First, structural differences
Gear pump: mainly composed of pump body, gear, shaft and seal parts. Two or more gears rotate in a closely matched pump body, and the volume changes through the meshing and separation of the gears, thus completing the suction and discharge of the liquid.
Vane pump: consists of rotor, stator, blade, valve plate and end cap and other components. The blade can slide flexibly in the groove of the rotor. Under the action of centrifugal force when the rotor rotates and pressure oil at the root of the blade, the top of the blade is close to the inner surface of the stator to form a sealed working cavity.
Second, the working principle
Gear pump: rely on a pair of teeth the same number, width and modulus of the same gear gear work, using gear mesh and detachment to form a seal volume changes and progress suction, pressure oil. Gear pump is a positive displacement pump, and its flow is proportional to the speed.
Vane pump: When the rotor rotates, the blade is under the action of centrifugal force and pressure oil, and the tip is close to the inner surface of the stator to form a sealed working chamber. With the rotation of the rotor, the volume of the sealing chamber gradually increases or decreases, so as to achieve oil absorption and oil pressure.
Third, performance characteristics
Efficiency: Gear pumps are known for their relatively high volumetric efficiency, typically 85% to 95%. Vane pumps also have good volumetric efficiency, usually in the range of 85% to 90%.
Pressure: Gear pumps are typically used in low to medium pressure applications, with pressures generally not exceeding 3,000 psi (200bar). Vane pumps are suitable for medium pressure applications and are also typically up to 3,000 psi (200bar), but certain variants can handle higher pressures.
Noise: Gear pump due to gear mesh, the noise is relatively large. The vane pump is usually quieter than the gear pump because it runs more smoothly.
Maintenance: Gear pumps generally require less maintenance due to their simpler design, but may require regular replacement of gears and seals. Vane pumps require moderate maintenance, and blade replacement and seal inspection are common maintenance tasks.
4. Application occasions
Gear pumps: Suitable for low to medium pressure applications where precise control of flow and pressure is not essential. They are simple in design, reliable and relatively low in cost, and are often used in scenarios with low requirements, such as lubrication systems and hydraulic systems.
Vane pumps: Suitable for applications where low noise levels and moderate pressures need to be maintained. They are capable of handling light to moderately viscous fluids and remain efficient under a variety of operating pressures. Vane pumps are also widely used in food and beverage processing, pharmaceuticals and other fields.
In summary, there are obvious differences between gear pump and vane pump in structure, working principle, performance characteristics and application occasions. In the selection, should be based on the specific application requirements, pressure requirements, flow requirements and cost considerations and other factors for comprehensive consideration.