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External gear pumps can be equipped with single or double (2 gear) pumps with straight (shown), spiral, and herringbone gears. Helical gears and glyphs usually provide a smoother flow than straight gears, although all gear types are relatively smooth. Large-capacity external gear pumps usually use spiral or herringbone gears. Small external gear pumps typically run at 1750 or 3450 rpm and operate in larger modes at speeds up to 640 rpm. External gear pumps have close tolerances and gears on both sides of the shaft bracket. This allows them to operate at pressures exceeding 3000 lb/200 rods, making them ideal for use in hydraulics. With four bearings in liquid and tight tolerances, they are not suitable for handling abrasive or extreme high temperature applications.
Strict internal clearance provides a more reliable measurement of liquid through the pump and greater flow control. Therefore, external gear pumps are popular polymer, fuel, and chemical additives that are involved in precision conveying and metering applications.
How an external gear pump works:
External gear pump similar suction pump internal gear pump, gear out of the net production process. However, the external gear pump uses the same gear rotation for the other party - one gear is driven by the motor to drive the other gear. Each gear supports the shaft and the bearing on both sides of the gear.
1. As the gear meshes they create, expand the intake side of the positive displacement pump. The liquid flows into the cavity, and the trapped teeth rotate for them.
2. The teeth and shell between the pockets of liquid inside the shell - it does not pass the intermediate gear.
Finally, the meshed gear forces the liquid through the outlet port under pressure.
Because gears are supported on both sides, external gear pumps are often used for hydraulic applications such as high pressure applications. Without suspended bearing loads, the rotor shaft cannot transfer, causing premature wear.
External gear pump advantages:
High speed, high pressure, no suspension bearing load, relatively quiet operation design to accommodate various materials
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External gear pump application
External gear pumps are a popular pumping principle and are often used as lubrication pumps in power tool units, in fluid power transmission units, and as fuel pump engines.