What is Gear Pump and how does it work?
The gear pump is one of the most important pumps . These types of pumps have gears in it which have the ability to provide pressure energy to the fluid in the pumps.
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In simple words, we can say that the gear pumps transfer the fluids from one part to another using gear mechanism. If the pressure of the system remains same then they will provide you with the fix flow rate also. So let’s discuss Gear pumps below.
So, What is a Gear Pump?
The Gear Pumps are basically positive displacement rotary pumps which helps you to transfer liquid or fluid by using its gears. It has more than two internal gears which create vacuum pressure to push the fluid in the pump.
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The Gear pumps are the high-pressure pumps which come in small sizes to provide a pulseless as well as stable fluid flows as compared to other pumps like peristaltic and diaphragm pumps. There are many other advantages of the Gear pumps which are better than other pumps like it is a self-priming pump, can pump high viscosity fluids, user-friendly pump as it is easy to operate and to maintain as well.
Working of a Gear Pump:
The Gear Pumps find their application in engine and transmission box of the slow speed engines as well as in oil transfer and combustion systems. With the help of gears, fluid displacement is possible in the Gear pumps. The fluid comes from the inlet port and after that reaches to the different parts of the Gear pump like spaces between the gear teeth and pump housing.
These pumps used rotating mechanism for contracting and expanding the chambers. The rotating assembly of gears will help you to create suction in the inlet of the pump to draw the fluid.
A pressure builds once fluid starts moving from inlet to outlet and with this the volume also decreases. There are pressure relief valves which protect the pumping system from the gear pumps.
The size of volume between teeth of the gear, amount of reverse flow and the speed of the rotation per minute is used to regulate the flow of gear pumps. To keep your pump maintenance free it is necessary to check the spring of relief valve, meshing clearance between teethes and casing of the pumps.
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Types of Gear Pumps:
The Gear pumps are available in two types:
One is External Gear pump and the other is Internal Gear Pump. So,
let’s discuss the difference between internal and external Gear
pumps below:
External Gear Pumps:
These types of pumps are not so costly and are easy to operate. You can find them in various machine tools, an oil pump of the engine and fluid power transfer units. To generate the flow these pumps used two gears with external cut teeth.
Features of External Gear Pump:
- They are compact in size and comes with an easy design
- They are capable enough to deliver high capacities due to their large outlets.
- It is capable of managing low, medium or high pressure
- On both sides of gears, it has close tolerances and shaft support.
Internal Gear Pumps:
In an internal gear pump, the rotor supports on one or two bearing and the design of the pump is bulky that makes it inefficient to work on high specification models. The pumping capacity of the internal gear pump is less in comparison to the external fear pumps. These gear pumps are highly versatile and can handle fluids having high viscosity at stable speeds.
Features of Internal Gear Pump:
- It can be run dry for a short period
- This pump has a bulky and large footprint
- The requirement of NPSH is very low
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