What is the structure of the fuel injector?

Nozzle structure: According to the different nozzle structures, fuel injectors can be divided into needle type and hole type. Fuel injector is the abbreviation of electric fuel injector, also known as electric fuel nozzle, which is mainly used to inject fuel into the intake manifold or combustion chamber of the engine. The fuel injector structure consists of a filter screen, a wire jack, an electromagnetic coil, a spring, an armature, a valve needle and a valve seat.

Fuel injector is an important part to maintain engine operation, which is composed of fuel injector body, fuel nozzle, bracket, spring and so on. High-pressure oil is pumped in from the oil supply port of the injector, and the high pressure generated in the injector acts on the conical surface of the injector. When the oil pressure exceeds the set value, the valve core of the injector opens, and the high-pressure oil is ejected from the nozzle and burned in the cylinder of the engine in the form of oil mist, so that the piston runs back and forth.

In the past, the nozzle used in diesel engine was controlled mechanically, and the nozzle of mechanical diesel engine worked by controlling the precision coupling (needle valve and needle valve body). Nozzle coupling is one of the three precision coupling parts of traditional diesel engine, which are plunger, plunger sleeve, needle valve, needle valve body, oil outlet valve and oil outlet valve seat. The nozzle of gasoline engine is a part of the electronic control system of gasoline engine, which replaces the carburetor of carburetor gasoline engine. The nozzles used in automobiles mainly include diesel nozzles, gasoline nozzles and natural gas nozzles. Now some foreign manufacturers can manufacture special nozzles for hydrogen.

(Photo/Text/Photo: Wang 1) @20 19