What is spark plug

Sparkplugs (sparkplugs), commonly known as the mouth, its role is to send high-voltage wire (fire mouth) pulse high-voltage discharge, breakdown between the spark plug between the two electrodes, resulting in spark ignition in the cylinder of the mixed gas The The main types are: quasi-spark plug, the edge of the prominent type of spark plug, electrode spark plug, seat spark plug, a very spark plug, face flash spark plugs and so on.

  basic structure


  The function of the spark plug is to introduce the high voltage of tens of thousands of volts into the combustion chamber and produce a spark-ignited mixture, which works with the ignition system and the oil supply system to make the engine work to a large extent, which together determines the performance of the engine.

  The main parts of the spark plug are insulators, housings, wire screws and electrodes. Insulators must have good insulation and thermal conductivity, high mechanical strength, can withstand high temperature thermal shock and chemical corrosion, the material is usually 95% alumina ceramic. The shell is a steel part, the function is to plug the spark plug in the cylinder head. The size of the hexagonal thread of the shell has been incorporated into the ISO international standard. The spark plug electrode includes a center electrode and a side electrode, with a spark gap between the two. The size of the gap directly affects the engine start, power, job stability and economy. Reasonable clearance is related to ignition voltage. The electrode material must have good resistance to electrical erosion (spark ablation) and corrosion (chemical - thermal corrosion), and should have good thermal conductivity. Between the center electrode and the wiring screw is a conductor glass sealant, it is necessary to be able to conduct electricity, but also to withstand the combustion of high pressure, while ensuring its sealing.

  working principle

  The other parts of the ignition system generate positive high voltage electrical pulses, which generate sparks and generate an explosion to provide the energy required for the engine power output.

  And the structure of the spark plug is made of an elongated metal plate through a ceramic material with an insulating function. The lower part of the insulator has a metal shell around it and is screwed to the cylinder head The bottom of the metal shell in the welding electrode and the car body to form a grounding effect. In addition, at the end of the center of the electrode, it must be separated by a slight discharge gap.

  Then, the high-voltage current from the distributor will conduct through the central electrode and then discharge at the discharge gap at the bottom, and the spark plug will function to produce a spark-burning mixture. The engine will generate energy and output power.

  It can be seen, the spark plug is to enter the engine combustion of gasoline and air mixed gas to ignite the device, working in high temperature, high pressure conditions, is one of the petrol engine consumables, it plays in the engine running quite Important role, and the fuel economy or not, the operation is smooth, have a great relationship.