Gear Pump | Parts | Types | Applications |

What is gear Pump ?

Gear Pump

gear pumps is a type of positive Displacement pump which uses the meshing of gears to pump fluid by displacement.

Gear Pump Working Principle

The gear pump working principle is explain briefly below:

When there is a revolution of toothed wheels inside of the casing section, air will get wedged in between and throughout the teeth which creates space. This shows a result of a positive up direction lift of the liquid on the way to the suction pump. The pump continues to pull in the air until it initiates to receive liquid through the inner section.

The liquid will be pulled into it at the level of atmospheric pressure; prior to being trapped in-between the space of two wheels. Gradually the viscous liquid will be pulled in the direction of output and then pulled towards the out. The pump functions effectively also in the inactive state but operates more actively when it got primed in before.

Added protection in the scenario of valve relieving is fitted in the gear type revolving pump so as to expel any kind of destruction either for the pipeline or pump. The relieving valve will decrease the additional pressure during emergency thus safeguarding the entire equipment.

Gear Pump Construction

Types of gear pump

there are mainly two types of gear ?

1.External Gear

2.Internal Gear

Parts of gear pump

Gear pump parts or components

1.Drive gear :-The Drive gear is connected to the prime mover . The power from the prime mover is used to rotate it. The prime mover is motor.

2.Driven gear :- The driven gear is meshed with drive gear. As drive gear rotates ,driven gear is rotated in opposite directions

3.Casing :- The driver and driven gears are both packed inside the gear pump’s casing.

4.Suction Side: The section of the gear pump from where fluid enters the gear pump. The Inlet Section is where low-pressure liquid enters the pump.

5.Discharge Side :- The discharge side of the gear pump is where pressurized fluid is delivered to the required area. The pump’s Outlet Section discharges high-pressure liquid.

6.Prime Mover: The prime mover in a gear pump is used to provide power to the shaft on which the driver gear is mounted. It could be an electric motor, an internal combustion engine, or manual labor.

Applications of Internal gear pumps

  • Used in surfactants and soaps manufacturing
  • Pigments, inks, and resins
  • Used in food products like animal feed, cocoa butter, corn soups and in many
  • Resins and Polymers
  • Alcohols and solvents
  • Asphalt, Bitumen, and Tar
  • Polyurethane foam (Isocyanate and polyol)
  • Glycol

What are the advantages and disadvantages of gear pumps?

 It can be run at a much lower speed because  a gear pump doesn’t have to generate centrifugal force. This makes it smoother and more controllable. Gear pumps are self-priming, which can be a huge benefit. Their discharge pressure can be very high, dependent upon a number of factors

Factors influencing gear pumps efficiency

Gear pumps are generally very efficient, especially in high-pressure applications.

The following factors influence pump efficiency:

1.Clearances:-Geometric clearances at the gear ends and outer diameters allow for leakage and back flow. Greater clearances, on the other hand, can sometimes help to reduce hydrodynamic friction and improve efficiency.

2.Backlash:-Due to high backlash between gears, fluid leakage is also possible. This, however, aids in preventing energy loss caused by fluid trapped between gear teeth (known as pressure trapping).

Can gear pumps be used for water

The gear water pumps is a popular choice for many applications. They aren’t always used for water, because They are used in the petrochemical and chemical industries and make great pumps for hydraulic applications. They can be used for viscous and aggressive fluids.

Can gear pumps run dry ?

Centrifugal, rotary vane, and gear pumps should not be run dry; exceptions are if the gear or impeller is made of a self-lubricating material such as RYTON in which case the pump can be run for a few minutes while priming.

Can a gear pumps run backwards ?

One of the biggest limitations of a traditional centrifugal pump is its inability to reverse the direction of flow. By design it can only be run in one rotation and one direction of flow.
but gear pump used in both directions.

Can you deadhead a gear pumps ?

Positive displacement pumps, which are what gear pumps are, should not be deadheaded, as they will break immediately. The exception to this for gear pumps is when the viscosity is so low that the fluid slipping backwards through the pump is actually relieving it (giving the fluid somewhere to go).

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