The external gear pump has two identical gears (power gear and driven gear) that rotate in opposite directions. Typically, the power gear is driven by an electric motor or an internal combustion engine that further rotates the driven gear. Sometimes, both axes can be driven by motor. These shafts are supported by different bearings on both sides of the housing.

1. When the gear on the suction side of the pump is detached from the interlock, the volume of the suction side is increased. When these gears begin to rotate against the pump housing, the fluid enters the cavity and gets trapped by the teeth of the gear.

2. The trapped liquid flows from the inlet to the outlet around the shell.

3, when the pump outlet side of the gear teeth mesh, the volume is reduced, the liquid is forced out under pressure.

Due to the tight tolerances between the housing and the pump gear, the pump creates suction on the suction side and prevents the fluid from partially backflowing from the outlet (although low-viscosity fluid leakage is more likely to occur). With external gear pumps, you can use herringbone, helical or spur gears. When the gears are engaged, the liquid cannot return from the center between the gears.

Advantages of external gear pump:

1. The pump works relatively quietly

2. High speed

3, no extended bearing load

4. Design contributes to a wide variety of materials

5, easy to maintain

6, compared with the internal gear pump, the design scalability is smaller

7, good reliability

Disadvantages of external gear pump:

1. No solid is acceptable

2, these pumps have a fixed end clearance

3. Four bushings in the fluid area

The above content introduces what is the working principle of the external gear pump, what are the advantages and disadvantages of the external gear pump. In addition, Shenzhen Oudejie Technology specializes in the sale of new imported gear pumps, and promises to sell products are new imported, while providing our customers with quotation, selection, product information and other services.