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The Concept Of A Gear Pump Is Very Simple
Sep 06, 2018

The concept of a gear pump is very simple. Its most basic form is that two identically sized gears are in a tight fit housing.

Engagement rotation, the inside of this housing is similar to the "8" shape, two gears are mounted inside, the outer diameter of the gear and the two sides closely match the housing. The material from the extruder enters the middle of the two gears at the suction port and fills this space, moves along the housing as the teeth rotate, and finally exits when the two teeth mesh.

In terms of terms, a gear pump is also called a positive displacement device, that is, a piston in a cylinder. When one tooth enters the fluid space of another tooth, since the liquid is incompressible, the liquid and the teeth cannot be in the same Time occupies the same space, so that the liquid is mechanically squeezed out. This phenomenon occurs continuously due to the continuous engagement of the teeth, thus providing a continuous discharge at the pump outlet, which is the same amount per revolution of the pump. As the drive shaft rotates uninterrupted, the pump discharges fluid without interruption. The pump flow is directly related to the pump speed.

In fact, there is a very small amount of fluid loss in the pump, because these fluids are used to lubricate both sides of the bearing and the gear, and the pump body is never able to fit without a gap, so the fluid cannot be discharged 100% from the outlet, so A small amount of fluid loss is inevitable, which makes the pump's operating efficiency not reach 100%. However, the pump can still operate well, and for most extruded materials, it can still achieve an efficiency of 93% to 98%.