Injectors: Its Definition, Uses And Working Principle

Injector is a device used for injecting liquid fuel into an internal-combustion engine. It can be termed as an apparatus for injecting feed water into a boiler. In case of diesel engines, fuel needs to be in a highly atomized form for suitable combustion. This is generally accomplished with the help of a plunger and cylinder arrangement (solid-injection), which forces precisely measured quantity of liquid fuel into the combustion chambers with the aid of atomizing nozzles. Compressed air is sometimes utilized in place of a plunger. These injectors are highly popular in diesel equipment such as rail locomotives, heavy-duty vehicles, marine vehicles and stationary power plants. They are also sometimes found in aircraft and motorized spark-ignition engines.

Boiler feed water injectors hire a high-velocity steam jet to force water into the boiler. When it comes to injectors, IH is a reputable brand. You can buy IH injector in USA from a variety of online store. Initially it was difficult to believe that boiler steam could force both itself and feed water back into the boiler. The introduction of such injectors by their inventor, Henri Giffard, created great interest worldwide. They can use exhaust steam at atmospheric pressure level to deliver feed water at 150 pounds per square inch.

The working principle is like that employed in the ejector. In mixing with the relatively cold feed water, the steam condenses, delivering most of its momentum to the water. The kinetic energy in association with the resulting (high) velocity is converted to pressure in a convergent-divergent passage, delivering the water to the boiler. Nowadays, they have been completely replaced by centrifugal boiler feed pumps, which have made them simple objects of historical interest.