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Gear Pump Mechanical Seal

As the gears rotate they separate on the intake side of the pump, creating a void and suction which is filled by fluid. The fluid is carried by the gears to the discharge side of the pump, where the meshing of the gears displaces the fluid. The mechanical clearances are small— in the order of 10 µm. The tight clearances, along with the speed of rotation, effectively prevent the fluid from leaking backwards.The rigid design of the gears and houses allow for very high pressures and the ability to pump highly viscous fluids.

There are two main variations; external gear pumps which use two external spur gears, and internal gear pumps which use an external and an internal spur gears (internal spur gear teeth face inwards, see below). Gear pumps are positive displacement (or fixed displacement), meaning they pump a constant amount of fluid for each revolution. Some gear pumps are designed to function as either a motor or a pump.

Generally Uses of Gear Pump Mechanical Seal:

Petrochemicals: Pure or filled bitumen, pitch, diesel oil, crude oil, lube oil etc.
Chemicals: Sodium silicate, acids, plastics, mixed chemicals, isocyanates etc.
Paint and ink.
Resins and adhesives.
Pulp and paper: acid, soap, lye, black liquor, kaolin, lime, latex, sludge etc.
Food:Chocolate, cacao butter, fillers, sugar, vegetable fats and oils, molasses, animal food etc.

Advantages Of Gear Pump Mechanical Seal:

1. High speed
2. High pressure
3. No overhung bearing loads
4. Relatively quiet operation
5. Design accommodates wide variety of materials