IGNITION PLUG Russian patent published in 2013 - IPC H01T13/00 

FIELD: electricity.

SUBSTANCE: mass electrode of ignition plug is combined with housing and equipped with tip with standard heating rate; in addition, resistive-semiconductor sealing pellet is introduced. Heat-removing washer is made from steel 08 KP and coated with layer of soft zinc; mass electrode is made in the form of flattened cone with conical outer surface and conical inner surface and has axial hole in the form of cylinder with length of 1÷2 mm; central electrode is located inside axial hole and coaxially to it, and end face of central electrode is located in interface plane of axial hole of mass electrode to outer surface; coaxially located surfaces of axial hole of mass electrode and central electrode form cylindrical capacitor with standard electric capacity C=2πξξ₀Ln(b/a), where a - central electrode radius, b - cylinder radius, ξ - relative dielectric permeability of environment, ξ₀ - electrical constant, L - length of surfaces of capacitor that is able to accumulate electric energy equal to $$Q_e=\frac{U_2\cdot C}{2},$$ where Q_e - electric energy, and U - voltage applied to cylindrical capacitor. Besides, mass electrode includes at least two radial holes with a profile in the form of injector; each injector is made in the form of two mating flattened conical surfaces: flattened conical inner surface and flattened conical outer surface; with that, flattened conical inner surface has angle α=55°÷65°, with diameter of injector top of 3 mm and is located with its top inside mass electrode, and flattened conical outer surface has angle β=110°÷130° and is located with its base to outer surface of mass electrode, and axes of injectors are made at angle γ=40°÷70° to longitudinal axis of ignition plug. With that, top of flattened conical outer surface has cross section in the form of circle; base of flattened conical outer surface has cross section in the form of ellipse, the long axis of which is located along longitudinal axis of mass electrode; connection of base of flattened conical inner surface with top of flattened conical outer surface is located in the middle of cross section of side wall of mass electrode, and the part of mass electrode between radial holes forms heat-conducting bridges; central electrode is made of heat-resistant P-type semiconductor; central electrode is tightly connected to contact head and to insulator by means of resistive-semiconductor sealing pellet with possibility of thermal connection of central electrode to insulator and contact head. Besides, resistive-semiconductor sealing pellet is made of N-type semiconductor; central electrode and resistive-semiconductor sealing pellet form a diode, the cathode of which is located on outer surface of central electrode; with that, edge of central electrode is element of spark gap.

EFFECT: improving operating characteristics of ignition plug by increasing igniting plasma power and organisation of turbulent combustion of fuel-air mixture; increasing ignition plug service life.

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