SU1720115A1 - Ignition plug - Google Patents

Abstract

Usage: electrical engineering, ignition devices for internal combustion engines. SUMMARY OF THE INVENTION: A candle is provided with a tapered surface formed on the body of the candle from the side of the side electrode. The parameters of the conical surface and the ratio of its parameters with the parameters of other elements of the spark plug are specified. 1 il.

Description

The invention relates to electrical engineering, in particular to the manufacture of spark plugs used on internal combustion engines.

A known spark plug consisting of a housing with a side electrode disposed thereon, an insulator and a central electrode, the housing being provided with a tapered surface facing the insulator to the insulator.

However, such a candle does not ensure the efficient use of the energy of the shock wave arising from spark breakdown.

The purpose of the invention is to reduce the time and completeness of combustion of the fuel mixture on the basis of a more complete use of the energy of the shock to ignite the fuel mixture.

The goal is achieved by the fact that a conical surface is placed on the body of the candle from the side of the side electrode, which reflects the shock wave into the combustion chamber.

The drawing shows the proposed spark plug.

The spark plug comprises a housing 1. an insulator 6 with a central electrode 5 located in it, a side electrode 4 fixed to the housing 1 to form a spark gap 3 between it and the end of the central electrode 5, and on the housing 1 from the side of the side electrode there is a conical surface 2 , facing tapering part of the insulator 6. The conical surface 2 is made so that the middle of its height is located in a plane parallel to the end of the central electrode 5 and located in the middle part of the spark gap 3. The height of the end meat surface 2 is 3-5 quantities of the spark gap 3, and the angle at the vertex of the cone is not less than a and less than a + 12 °, wherein, the angle "is determined from the expression

D + (5

arctg a

but

where D is the thickness of the side electrode 4 in the part that is located above the end of the central electrode 5, mm;

d - the magnitude of the spark gap 3,

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a is the largest distance from the side face of the central electrode 5 to the conical surface 2 along the perpendicular straight to the axis of the central electrode 5, mm.

Such an angle of inclination of the conical surface 2 provides for the reflection of a shock wave from it into the combustion chamber in such a way that the beam of reflected waves is not shielded or almost not shielded by the side electrode 4.

In the case of spark breakdown, a toroidal shock wave is generated between the side electrode 4 and the central electrode 5, which propagates with a supersonic speed exceeding the speed of a self-supporting flame and has a temperature in the front much higher than 2000 ° K.

When a toroidal shock wave propagates, its front 7 moves away from the spark gap 3 perpendicular to the axis of the central electrode 5, increasing in height as it approaches the conical surface 2. When it reaches the conical surface 2, the shock wave reflects from it with the formation of a beam of reflected waves. the waves that propagate into the combustion chamber ignite the combustible mixture.

The invention reduces fuel consumption by a spark-ignited internal combustion engine. This is due to the creation by the beam of reflected waves of additional turbulence of the combustible mixture and ignition of the fuel charge in a larger volume of the combustion chamber, which contributes to the intensification of combustion and more complete combustion of the fuel.

Claims (1)

The spark plug for an internal combustion engine, comprising a housing, an insulator with a central electrode placed in it, a side electrode fixed to the housing to form a spark gap between it and the end of the central electrode, and on the housing from the side electrode side there is a conical surface that converges tapering part to the insulator, characterized in that, in order to reduce the combustion time and increase the combustion efficiency of the fuel mixture, the conical surface is made so that The height of its height is located in a plane parallel to the end of the central electrode and located in the middle part of the spark gap, the height of the conical surface is equal to 3-5 values of the spark gap, and the angle at the apex of the cone is at least ai not more than a + 12 °, and are expression: arctga - -; , where A is the thickness of the side electrode in the part that is located above the end of the central electrode; d - the magnitude of the spark gap; a is the largest distance from the side face of the central electrode to the tapered surface along a perpendicular straight line to the axis of the central electrode.