What exactly is a gear pump? A gear pump, falling under the category of positive displacement pumps, operates by enclosing a fixed volume using interlocking gears, transferring fluid mechanically through a cyclical pumping action. Its output, a smooth and pulse-free flow, correlates directly with the rotational speed of its gears.

How does a Car Lift Repair Tampa Florida ear pump function? Using rotating cogs or gears, gear pumps transfer fluids. As these gears rotate, they create a liquid seal within the pump casing, generating suction at the inlet. Fluid drawn into the pump gets enclosed within the gear cavities and then transferred to the discharge. There are two main designs: external and internal.

External Gear Pump: Comprising two interlocking gears supported by separate shafts, typically with one gear driven by a motor, external gear pumps create an expanded volume on the inlet side, allowing fluid to flow in and get trapped by the gear teeth. This trapped fluid moves from inlet to discharge as the gears rotate, ultimately getting forced out under pressure on the discharge side. The close tolerances between gears and casing enable suction at the inlet and prevent fluid leakage from the discharge side.

Internal Gear Pump: Operating similarly to external gear pumps but with interlocking gears of different sizes, internal gear pumps have one gear rotating inside the other. The larger gear, or rotor, features teeth projecting internally, while a smaller external gear, the idler, meshes with the rotor. A crescent-shaped partition seals the inlet and outlet ports, facilitating fluid transfer as the gears rotate.

What are the notable features and advantages of gear pumps? Compact and straightforward, gear pumps boast a minimal number of moving parts. While they may not match the pressure of reciprocating pumps or the flow rates of centrifugal pumps, they offer higher pressures and throughputs compared to vane or lobe pumps. Gear pumps excel in pumping oils and other high viscosity fluids. External gear pumps can handle higher pressures and flow rates, while internal gear pumps are better suited for high viscosity fluids.

What are the limitations of Car Lift Repair Tampa Florida gear pumps? Gear pumps are prone to wear, especially when dealing with abrasive fluids or solids. They should not run dry for extended periods, and their performance diminishes as clearances increase due to wear. While gear pumps continue pumping against back pressure, they require relief valves to prevent system over-pressurization. Internal gear pumps are preferred for shear-sensitive liquids and hygienic applications due to their lower speeds and simpler design.

What are the primary applications of Car Lift Repair Tampa Florida gear pumps? Gear pumps find common use in pumping high viscosity fluids like oil, paints, resins, and food products. They are favored for applications requiring accurate dosing or high-pressure output, and their performance remains consistent even with irregular supply. External gear pumps are suitable for various fuel oils, hydraulic applications, and chemicals, while internal gear pumps excel in food processing, paint, and soap manufacturing.

What exactly is a gear pump? A gear pump, categorized as a rotary positive displacement pump, comes in two designs: Internal Eccentric or External (also known as helical gear).

The selection of design for a particular process hinges on the fluid’s viscosity and required pressure. The internal design undergoes alterations based on the fluid type, with different styles of teeth adapted to suit various conditions, thereby constraining rotational speed.

Car Lift Repair Tampa Florida Gear pumps exhibit versatility, featuring self-priming capabilities up to 6.5 meters, positive displacement that generates non-pulsating flow, and the ability to handle viscosities ranging from 1 CST to 1,000,000 CST.

How does a Car Lift Repair Tampa Florida Gear pump Work?

Gear pumps function through two idler gears, facilitating fluid movement between cavities within the teeth and the cavity itself. Fluid becomes entrapped by the rotating teeth, following the path of least resistance toward the discharge via the meshed components. These pumps come in two variants: External or Internal.

What is an External Gear Pump? (Helical / Modular)

A helical or external unit is selected for transferring viscous fluids at low rpm, ensuring a smooth discharge of fluid.

This type of pump typically produces less noise compared to an internal eccentric design, primarily due to its lower operating speed and the design of its teeth. The helical parts, positioned at an angle within the pump head, are complemented by a secondary set of helical gears behind the main teeth, ensuring balanced operation.

Car Lift Repair Tampa Florida Gears are positioned one above the other within the head, with one being motor-driven. They are synchronized to mesh with fluid flowing into open cavities, rotating between the teeth and casing, and then transferring to the outlet.

What is an Internal (eccentric) Car Lift Repair Tampa Florida Gear Pump?

The operation within an internal design mirrors that of an external type, as the spaces between the teeth in the pump are filled with liquid. Clean liquid is essential due to the small gaps between the teeth.

Fluid enters the meshed cogs, with a section of the idler sealing the inlet and propelling the fluid toward the outlet.

Seal types employed within different pump designs include a single mechanical seal, double mechanical seal, gland packing/stuffing, or magnetic coupling in the absence of a seal.

Heating jackets, operated via electricity or a separate heat transfer fluid, can be installed in both styles of pumps to prevent the solidification of liquids within the pump head.

Comparison Table of Internal & External Gear Pump

Internal Gear

External Gear

Consists of 2 working parts: Rotor & shaft, and idler gear

Features 2 interlocking gears mounted on separate shafts

Equipped with 2 bushings for shaft support and one bearing within the liquid

Typically has 4 bushings immersed within the liquid

Designed for medium pressure, up to 15 bar

Built for high pressure, up to 30 bar

Capable of handling up to 200 cubic meters per hour

Offers a high flow design, up to 300 cubic meters per hour

Adjustable end clearance

Fixed end clearances leading to inevitable slip

Able to handle small solids

Unable to handle solids

Cog designs vary

Cog designs include internal gear pump teeth and helical gear pump teeth

Why choose Gear Pumps?

Gear pumps offer numerous advantages, including:

Low Shear: Operating at low speeds, they induce low shear.

Self-Priming: They are self-priming up to 6.5 meters.

Reversible: Their design allows operation in both directions, ensuring hoses can be emptied and enabling full product recovery.

Efficient: Models boast efficiency levels of up to 85%.