CN2449392Y - Ignition spark plug for engine - Google Patents

Abstract

The utility model discloses an ignition spark plug for a petrol engine and is composed of a shell body, a double-head screw rod and a central composite electrode with a detonating cap. A column-shaped jetting barrel is formed by lengthening the length of an outer shell, and the composite electrode and the inner wall of the jetting barrel are caused to form a jetting combustion chamber by shortening the length of a porcelain core surrounding the central composite electrode. An ignition gap is formed between the rim edge of a detonating skirt of the lower part of the detonating cap and the end of the jetting barrel. The ignition spark plug for a petrol engine can conspicuously increase the ignition energy, generate the strong jetting ignition effect and cause the ignition to become reliable. The ignition spark plug for a petrol engine can also increase the heat value of the spark plug, eliminate the pre-ignition phenomenon, raise the heat efficiency, cause the power performance and the fuel economy of the engine to be better and greatly reduce the exhaust emission. The ignition spark plug for a petrol engine can be used for petrol engines with various power and rotating speed.

Description

A kind of engine ignition spark plug

The utility model relates to engine ignitor, is specifically related to a kind of petrol engine ignition spark plug.

Spark plug is as petrolic igniter, its performance quality directly influences the parameters of engine, traditional spark plug catches fire owing to its ignitor contact area Xiao Yi causes, phenomenons such as pinking, influence engine performance, and useful life is low, can not satisfy the requirement of modern gasoline machine, Chinese patent 95242393.6 discloses a kind of flame combustion-type spark plug, it is characterized in that ignition cap of welding on central electrode, utilize the edge and the shell of ignition cap to form ignition gap, increased the contact area of ignitor, make ignition performance obtain some improvement, but also have following problem in practice, because after central electrode has added ignition cap, the way that the incoming mixture of charging stroke is entered around the porcelain core is obstructed, so the thermolysis of porcelain core weakens, temperature rise is higher, makes the anti-incandescent ignition ability of spark plug reduce, cause advanced ignition and pre-ignition easily, cause engine power to descend; Also have, its ignition cap is the spark plug end face that is flushing with cylinder wall with ignition location between shell edge.Because casing wall is to firing the suction-operated of waste gas, make that to have fired waste gas near the casing wall many, incoming mixture is few, and spark is created in this zone, and its igniting reliability then can be a greater impact; Have, owing to be subjected to the restriction of spark plug standard, the gas chamber volume between housing and porcelain core is very little again, so the expulsion pressure that its produces is also little, the turbulent flow that in the combustion chamber, causes also a little less than, little to the flame propagation velocity influence, so oil-saving effect is not obvious.

The purpose of this utility model is to overcome above-mentioned deficiency and provides a kind of igniting reliable, can produce strong jet ignition, combustion combustion indoor turbulence is strengthened, improve combustion process, save fuel oil, adaptation comprising loading greatly at a high speed uses the gasoline engine ignition spark plug of operating mode.

In order to achieve the above object, the utility model adopts following structure, the petrol engine ignition spark plug, comprise a threaded metal shell, in ceramics insulator is housed, the twin-screw that the band wiring nut is arranged in the insulator, an electro-conductive glass fusion body and an end stretch out the Central Composite electrode of insulator, the combination electrode top is provided with detonating cap, it is characterized in that, the outer cover length that lengthening is parallel with the Central Composite electrode, form the cylindrical jet tube, shorten the porcelain core length of parcel central electrode, make between exposed central electrode and ignition cap and the spraying canister inwall to constitute jet combustors, the detonating skirt edge of the circular ignition cap on the central electrode and spraying canister edge constitute ignition gap.

Its length of described spraying canister is the 4-10 millimeter, exposed electrode in spraying canister central authorities also is the 4-10 millimeter, protrude its lower edge of described circular detonating cap, form detonating skirt, its width of getting angry the shirt rim is 0.1-2.5mm, the tapered plane of shirt rim and the angle of horizontal plane are 0 °-45 °, and the extended line of tapered plane is by edge in the spraying canister end face.

The course of work of the present utility model and principle are as follows: after the ignition gap of detonating skirt edge and spraying canister edge formation produces spark, light the indoor gaseous mixture of spray combustion, because the throttling action that detonating skirt and spraying canister end face form, make the gaseous mixture of burning spray consumingly from ignition gap, thus the gaseous mixture in the rapid ignition engine.Simultaneously,, not only can in containing the incoming mixture of less waste gas, light a fire, also make flame transmission, therefore further shorten the time that burning is finished apart from shortening because that spraying canister puts in the cylinder combustion chamber interior is longer; Combination electrode is exposed more, just make insulator length shorten, surface area reduces, by the spark plug design theory as can be known, spark plug requires when the high rotating speed of big load, and the temperature of electrode and porcelain core can not surpass 900 ℃, otherwise can cause pre-ignition, engine power is reduced, and the calorific value of spark plug is mainly decided by the heat dissipation characteristics of porcelain core.Porcelain core is long, and the heat radiation approach is long, and endotherm area is big, and its calorific value is low, is applicable to low-power and slow-revving engine; Porcelain core is short, and the heat radiation approach is short, and endotherm area is little, and its anti-incandescent ignition ability is just high, and spark-plug heat value is just high, is adapted to the powerful engine of high rotating speed and the pre-ignition phenomenon can take place.The detonating skirt of central electrode detonating cap bottom is designed to have the protrusion inclined-plane of certain angle, so that the extended line on inclined-plane by edge in the spraying canister end face, will have best spark-over effect like this, guarantees ignition quality.

Because the structure that the utility model has adopted above-mentioned jet combustors and had certain angle shirt rim ignition cap, make the utility model can significantly improve ignition energy, produce strong jet ignition effect, in cylinder, produce stronger turbulent flow, make that igniting is more reliable, flame propagation velocity is accelerated; Owing to improved the calorific value of spark plug, just can eliminate the pre-ignition phenomenon; Because flame propagation velocity is accelerated, thereby has improved the heat efficiency, makes engine power performance and fuel economy better, useless discharging is significantly descended.

Be described in further detail the utility model below in conjunction with accompanying drawing

Fig. 1 is the utility model structural representation

Can show structure of the present utility model from Fig. 1, be threaded and the housing 3 of spraying canister 10 in pack into porcelain core 1 and copper gas ket 11, the combination electrode 7 of band copper core electrode 13 is housed in porcelain core 1, add conductive glass powder 4, reinstall double threaded screw 2, make the electro-conductive glass fusing connect Central Composite electrode 7 and double threaded screw 2 with the heating of high-frequency heating pressure packaging machine, pressurize simultaneously, red copper gas ket 11 and the sealing of porcelain core 1 bound edge shell 3.The porcelain core 1 that encases combination electrode 7 constitutes narrower ring-shaped air chamber 5 with shell 3 inwalls, exposed combination electrode 7 then constitutes jet combustors 10 with spraying canister 6 inwalls, welding has the detonating cap 12 of detonating skirt 14 on combination electrode 7, the angle of detonating skirt and spraying canister end face is 30 degree, detonating skirt 14 forms ignition gap 8 with spraying canister 6 end faces, ignition cap 12 can be the circle in the diagram, also can be other shape.

Claims (4)

1 one kinds of engine ignition spark plugs, comprise a threaded metal shell (3), in ceramic insulation porcelain core (1) is housed, the double threaded screw (2) of band wiring nut is housed in the porcelain core, electro-conductive glass fusion body (4), stretch out the Central Composite electrode (7) of insulated ceramic core (1) with an end, the top of combination electrode (7) is provided with detonating cap (12), it is characterized in that, the length of the shell (3) parallel with Central Composite electrode (7) of extending forms cylindrical jet tube (6), shorten the length of the porcelain core (1) of parcel Central Composite electrode (7), make the detonating skirt (14) that constitutes circular detonating cap (12) bottom on jet combustors (10) the Central Composite electrode between exposed Central Composite electrode (7) and ignition cap and spraying canister (6) inwall constitute ignition gap (8) with spraying canister (6) edge.

2 according to the described spark plug of claim, and the length that it is characterized in that described spraying canister (6) is the 4-10 millimeter.

3 spark plugs according to claim 1 is characterized in that, the exposed partly length of described combination electrode (7) in spraying canister (6) central authorities is the 4-10 millimeter.

4 spark plugs according to claim 1 is characterized in that: its lower edge of described circular ignition cap (12) is protruded and is formed detonating skirt, and the width of its shirt rim is the 0.1-2.5 millimeter, and the tapered plane of shirt rim and horizontal sextant angle are the 0-45 degree.

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