CN202840241U

CN202840241U - Spark plug

Info

Publication number: CN202840241U
Application number: CN 201220396284
Authority: CN
Inventors: 张蝶儿
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-08-10
Filing date: 2012-08-10
Publication date: 2013-03-27
Anticipated expiration: 2022-08-10

Abstract

The utility model relates to a spark plug which comprises an insulator, a central electrode, a shell, a grounding electrode and a fire guiding unit, wherein the insulator has an axle hole extending along an axis direction, the central electrode is inserted into and penetrates the axle hole of the insulator and has an exposed end, the shell is hollow and cylindrical, is sleeved on the surface of the insulator and enables the end of the central electrode to be located in the shell, the grounding electrode is arranged on the inner wall of the shell, the fire guiding unit is arranged at a fire outlet of the shell and comprises spiral blades, and the spiral blades are directly connected with the fire outlet of the shell or are fixed on an annular connection part connected with the fire outlet of the shell. The spark plug provided by the utility model has corrosion resistance and can introduce and guide sparks so as to form vortex air flow for concentrated ejection into a combustion chamber, so diffusion of firepower all round is avoided, and concentrated firepower improves combustion efficiency of an internal combustion engine to some extent, which is beneficial for energy saving and environmental protection.

Description

A kind of spark plug

Technical field

The utility model relates to a kind of spark plug that uses in internal combustion engine.

Background technology

Spark plug is to be installed on the internal combustion engine (engine), is used for the sparking of the mist in the combustion chamber.See also Fig. 1, it is the structural representation of spark plug 10 in the prior art.This spark plug 10 comprises a central electrode 12, insulator 14, housing 16 and grounding electrode 18.This insulator 14 is ceramics insulator, has the axis hole that extends along axis direction, and this central electrode 12 inserts the axis hole that runs through this insulator 14.This housing 16 is arranged on the periphery of this insulator 14.This grounding electrode 18 is connected with the end of this housing 16, and crooked extension is relative with central electrode 12, and forms the gap of sparkover between the central electrode 12.Effect by pulse electric power between this central electrode 12 and the grounding electrode 18 produces electric arc, and then produces electric spark and light mist around the electrode, reaches the purpose of automatic ignition.

Because the operational environment of spark plug is exceedingly odious, this central electrode 12 and grounding electrode 18 need igniting many times under the high-temperature and high-pressure conditions in the combustion chamber, and can occur deposit on this electrode and cause its corrosion, cause being worse off of spark plug.In order to slow down the speed of worsening of spark plug, those skilled in the art has carried out various improvement to spark plug.Such as the corrosion resistance by improving electrode material or increase the etching problem that number of electrodes overcomes electrode; Or central electrode and grounding electrode be arranged in the cavity of housing.But the corrosion resistance that improves electrode material need to propose new electrode material, in the situation that adopt existing electrode material can't change the etching problem of electrode; For a plurality of electrodes are set simultaneously, because these a plurality of electrodes expose to the open air equally in the combustion chamber, will suffer erosion simultaneously, can not fundamentally solve the anticorrosive problem of electrode; And the above-mentioned various spark plug that has improved also has a problem, i.e. the firepower of spark plug ejection can to around diffusion, concentrate not efficiently, reduced to a certain extent the combustion efficiency of internal combustion engine, be unfavorable for energy-conserving and environment-protective.

The utility model content

The shortcoming that the purpose of this utility model is to overcome prior art provides a kind of efficient and erosion-resisting spark plug of concentrating with not enough.

The utility model is achieved through the following technical solutions: a kind of spark plug comprises insulator, central electrode, housing, grounding electrode and leads fiery unit.Wherein, this insulator has the axis hole that extends along axis direction; This central electrode inserts and runs through the axis hole of this insulator and expose the end; This housing is hollow columnar, and this housing is set in this insulator surface and makes the end of central electrode be positioned at this housing chamber; This grounding electrode is arranged on the inwall of this housing; This leads the port that fires that fiery unit is arranged on this housing, and this is led fiery unit and comprises helical blade, and this helical blade directly is connected with the port that fires of this housing, and perhaps this helical blade is fixed on the annular connecting portion that is connected with the port that fires of housing.

Further, this leads the helical blade that fiery unit comprises that at least two mutual isogonisms arrange.

Further, the pair that also comprises the intersection point place that is arranged on this helical blade is led fiery section, it comprises secondary connecting portion and secondary helical blade, and this pair connecting portion is annular, and secondary helical blade is arranged in the annular space of this pair connecting portion and with the medial surface of this pair connecting portion and is fixedly connected with.

With respect to prior art, the spark plug that the utility model provides is arranged on central electrode and grounding electrode in the igniting chamber of housing, makes it have corrosion resistance.Further, by leading fiery unit spark is carried out drainage and water conservancy diversion, form eddy airstream and concentrate to the combustion chamber eruption, avoided firepower to diffusion all around, the firepower of concentrating can improve the combustion efficiency of internal combustion engine to a certain extent, is conducive to energy-conserving and environment-protective.

Description of drawings

Fig. 1 is the structural representation of spark plug 10 in the prior art.

Fig. 2 is the structural representation of the spark plug 100 of the utility model embodiment one.

Fig. 3 is the perspective view of leading fiery unit shown in Figure 2.

Fig. 4 is the structural representation of the spark plug 200 of the utility model embodiment two.

Fig. 5 is the cutaway view of A direction shown in Figure 4.

Fig. 6 is the perspective view of leading fiery unit shown in Figure 4.

Fig. 7 is the structural representation of the spark plug 300 of the utility model embodiment three.

Fig. 8 is the planar structure schematic diagram of leading fiery unit 390 shown in Figure 7.

Fig. 9 is the structural representation of the spark plug 400 of the utility model embodiment four.

Figure 10 is the structural representation of the spark plug 500 of the utility model embodiment five.

Figure 11 is the cutaway view of A direction shown in Figure 9.

Figure 12, it is the cutaway view of A direction shown in Figure 10.

Figure 13 is the structural representation of the spark plug 600 of the utility model embodiment six.

Figure 14 is the structural representation of the spark plug 700 of the utility model embodiment seven.

Figure 15 is the structural representation of the spark plug 800 of the utility model embodiment eight.

Figure 16 is the cutaway view of A direction shown in Figure 13.

Figure 17 is the planar structure schematic diagram of the fiery unit 990 of leading of the utility model embodiment nine.

Embodiment

Embodiment 1

See also Fig. 2, it is the structural representation of the spark plug 100 of the utility model embodiment one.This spark plug 100 comprises a central electrode 120, insulator 140, housing 160, grounding electrode 180 and leads fiery unit 190.This insulator 140 is ceramics insulator, and it has the axis hole that extends along axis direction.This central electrode 120 inserts and runs through the axis hole of this insulator 140 and expose end 122.This housing 160 is hollow columnar structures, is set in the surface of this insulator 140, and makes the end 122 of this central electrode 120 be positioned at the cavity of housing 160.This grounding electrode 180 is arranged on the inwall of cavity of this housing.Be provided with screw thread on the outer wall of this housing 160.Please consult simultaneously Fig. 3, it is the perspective view of leading fiery unit 190 shown in Figure 2.This is led fiery unit 190 and comprises connecting portion 192 and helical blade 194.This connecting portion 192 is annular, comprises in the present embodiment the helical blade 194 that three mutual isogonisms arrange, and its center at this annular connecting portion 192 connects, and is fixedly connected with the medial surface of this connecting portion 192 respectively.This connecting portion 192 is connected with the port that fires of this housing 160, and dwindles gradually collar extension along Way out.

After pulse firing, be full of mist in each cavity of the housing 160 of this spark plug 100, mist between this central electrode 120 and the grounding electrode 180 around the discharge ignitor, ignited rear rapid expansion and to external eruption of mist, when process is led fiery unit 190,194 pairs of sparks of helical blade of leading fiery unit 190 carry out drainage and water conservancy diversion, the formation eddy airstream is concentrated and is erupted to the combustion chamber, avoided firepower to diffusion all around, the firepower of concentrating can improve the combustion efficiency of internal combustion engine to a certain extent, is conducive to energy-conserving and environment-protective.

Embodiment 2

The present embodiment two is roughly the same with embodiment one, and its difference only is the structure of enclosure interior and the stereochemical structure of leading fiery unit.See also Fig. 4, it is the structural representation of the spark plug 200 of the utility model embodiment two.This spark plug 200 comprises a central electrode 120, insulator 140, housing 260, grounding electrode 280 and leads fiery unit 290.This insulator 140 is ceramics insulator, and it has the axis hole that extends along axis direction.This central electrode 120 inserts and runs through the axis hole of this insulator 140 and expose end 122.This housing 260 is hollow columnar structures, is set in the surface of this insulator 140, and makes the end 122 of this central electrode 120 be positioned at the cavity of housing 260.This grounding electrode 280 is arranged on the inwall of cavity of this housing 260.Be provided with screw thread on the outer wall of this housing 160.

Particularly, this housing 260 sequentially comprises igniting chamber 261, accelerated passage 262 and the inlet chamber 263 that runs through vertically its upper and lower side.This igniting chamber 261 sequentially comprises the first circular cylindrical cavity 261a and the first horn-like cavity 261b of connection, the aperture of the wide mouth end of this first horn-like cavity 261b is consistent with the aperture of this first circular cylindrical cavity 261a, and the slot end of this first horn-like cavity 261b is connected with this accelerated passage 262.This accelerated passage 262 is circular cylindrical cavity, and its aperture is consistent with the aperture of the slot end of the first horn-like cavity 261b in this igniting chamber 261.This inlet chamber 263 comprises the second horn-like cavity 263b and the second circular cylindrical cavity 263a of connection, this second is that the aperture of slot end of horn-like cavity 263b is consistent with the aperture of this accelerated passage 262 and be connected with it, the aperture of the wide mouth end of this second horn-like cavity 263b is consistent with the aperture of this second circular cylindrical cavity 263a, and this second circular cylindrical cavity 263a is towards the combustion chamber of internal combustion engine.

Please consult simultaneously Fig. 5, it is the cutaway view of A direction shown in Figure 4.This grounding electrode 280 is circular along the section of direction perpendicular to axial direction, and it is located on the inwall of the first circular cylindrical cavity 261a in igniting chamber 261 of housing 260.This grounding electrode 280 is formed in one with this housing 260.This central electrode 120 can be positioned on this grounding electrode 280 one with its axially on the center of circle on vertical plane, in the present embodiment specifically at ring in the heart.

Please consult simultaneously Fig. 6, it is the perspective view of leading fiery unit 290 shown in Figure 4.This is led fiery unit 290 and is comprised of two helical blades 294 that are the diagonal angle setting.These two helical blades 294 are fixedly installed on the port that fires of this housing 260, and connect in the center of the port that fires of this housing 260.

When pulse firing, be full of mist in each cavity of the housing 260 of this spark plug 200, mist between this central electrode 120 and the grounding electrode 180 around the discharge ignitor, the chamber 261 interior gases of lighting a fire this moment are at first ignited and are expanded rapidly, pressure in this igniting chamber 261 increases rapidly, promotes spark and discharges to inlet chamber 263 directions.When spark process accelerated passage 262, because narrow rapidly in the aperture of accelerated passage 262, flow velocity during this accelerated passage 262 of spark air-flow process increases, thereby spark is seted out more fast, and spark passes through when leading fiery unit 290 again, and 294 pairs of sparks of helical blade of leading fiery unit 290 carry out drainage and water conservancy diversion, and the formation eddy airstream is concentrated and erupted to the combustion chamber, avoided firepower to diffusion all around, thereby more efficiently spark has been guided in the combustion chamber of internal combustion engine.In order to make 262 pairs of spark air-flows of accelerated passage accelerator more effective, the length of this accelerated passage 262 should be greater than the length of this inlet chamber 263, and volume that should igniting chamber 261 should be greater than the volume of this accelerated passage, with guarantee central electrode 261 after 261 igniting of igniting chamber at first the gas in lead fire chamber 261 accelerate by accelerated passage 262 again.Further, the length of this inlet chamber 263 be about this igniting chamber 261, accelerated passage 262 and inlet chamber 263 total length 1/6～1/5.

And when the induction stroke of internal combustion engine, the pressure in the inlet chamber 263 is greater than the pressure in the igniting chamber 261, and mist enters igniting chamber 261 from inlet chamber 263.When mist process accelerated passage 262, because narrow rapidly in the aperture of accelerated passage 262, flow velocity when the air-flow of mist passes through this accelerated passage 262 increases, mist more promptly is full of igniting chamber 261, thereby efficiently the combustion chamber of mist by internal combustion engine is guided in the igniting chamber 261.

Further, by prior art as can be known, the compression stroke of internal combustion engine operation and the time of expansion stroke are the set time, at the piston of internal combustion engine during near top dead centre, spark plug sends electric spark, light compressed combustion mixture, burning mixture is in the time of expansion stroke internal combustion and discharge heat energy, and pushing piston is moved to lower dead center by top dead centre.Therefore, in the igniting chamber 261 of housing interior when being lighted gas through accelerated passage 262 flow velocity increase, make spark arrive the combustion chamber with the speed of more accelerating, shortened the time of kindling material arrival combustion chamber, overcome the defective that increases because of the distance that causes spark to enter the combustion chamber in the cavity that central electrode and grounding electrode is arranged on housing, relatively increased the burning time of the combustion mixture in the combustion chamber in expansion stroke, fuel is burnt in internal combustion engine more fully, reach the effect of energy-saving and emission-reduction.

Embodiment 3

See also Fig. 7, it is the structural representation of the spark plug 300 of the utility model embodiment three.The structure of the spark plug of itself and embodiment two is roughly the same, and difference only is: housing 360 sequentially comprises igniting chamber 361, accelerated passage 362 and the inlet chamber 363 that runs through vertically its upper and lower side.This igniting chamber 361 is a horn-like cavity, and its slot end is connected with this accelerated passage 362.This accelerated passage 362 is circular cylindrical cavity, and its aperture is consistent with the aperture of the slot end of the horn-like cavity in this igniting chamber 361.This inlet chamber 363 is similarly a horn-like cavity, and the aperture of its slot end is consistent with the aperture of this accelerated passage 362 and be connected with it, and its wide mouth end is towards the combustion chamber of internal combustion engine.The inwall in the igniting chamber 361 of this housing is as grounding electrode 380, and the end 122 of the central electrode 120 of this spark plug 300 is positioned at this igniting chamber 361, and perpendicular nearest inwall point carries out the arcing discharge.Further, have spiral helicine groove or protuberance on the inwall of this igniting chamber 361, accelerated passage 362 and inlet chamber 363, form eddy airstream when guiding spark air-flow in it to discharge to the combustion chamber, the efficient that discharges with further raising spark.

See also Fig. 8, it is the planar structure schematic diagram of leading fiery unit 390 shown in Figure 7.This is led fiery unit 390 and comprises connecting portion 392, helical blade 394 and connecting bridge 396.This connecting portion 392 is annular, comprises in the present embodiment the helical blade 394 that three mutual isogonisms arrange, and its center at this annular connecting portion 392 connects, and is fixedly connected with the medial surface of this connecting portion 392 respectively.This connecting portion 392 is connected by connecting bridge 396 with the port that fires of this housing 360.

Embodiment 4

See also Fig. 9, it is the structural representation of the spark plug 400 of the utility model embodiment four.The structure of the spark plug of itself and embodiment two is roughly the same, and difference only is: housing 460 sequentially comprises igniting chamber 461, accelerated passage 462 and the inlet chamber 463 that runs through vertically its upper and lower side.This igniting chamber 461, accelerated passage 462 and inlet chamber 463 are circular cylindrical cavity, and the aperture of this accelerated passage 462 is less than the aperture of this igniting chamber 461 and inlet chamber 463.Please consult simultaneously Figure 11, it is the cutaway view of A direction shown in Figure 9.Further, comprise the grounding electrode 480 of two sheets, the sheet plane parallel of this grounding electrode 480 is axial in cavity, and along on the inwall that radially is installed in igniting chamber 461 in this igniting chamber 461.The grounding electrode 480 of these two sheets is symmetrical arranged.The setting of this grounding electrode 480 more is conducive to improve the ignition effectiveness of this spark plug 400.

Embodiment 5

See also Figure 10, it is the structural representation of the spark plug 500 of the utility model embodiment five.The structure of the spark plug of itself and embodiment two is roughly the same, and difference only is: housing 560 sequentially comprises igniting chamber 561, accelerated passage 562 and the inlet chamber 563 that runs through vertically its upper and lower side.This igniting chamber 561 sequentially comprises the first circular cylindrical cavity 561a and the first horn-like cavity 561b of connection, the aperture of the wide mouth end of this first horn-like cavity 561b is consistent with the aperture of this first circular cylindrical cavity 561a, and the slot end of this first horn-like cavity 561b is connected with this accelerated passage 562.This accelerated passage 562 is circular cylindrical cavity, and its aperture is consistent with the aperture of the slot end of the first horn-like cavity 561b in this igniting chamber 561.This inlet chamber 563 comprises the second horn-like cavity 563b and the second circular cylindrical cavity 563a of connection, this second is that the aperture of slot end of horn-like cavity 563b is consistent with the aperture of this accelerated passage 562 and be connected with it, the aperture of the wide mouth end of this second horn-like cavity 563b is consistent with the aperture of this second circular cylindrical cavity 563a, and this second circular cylindrical cavity 563a is towards the combustion chamber of internal combustion engine.

Please consult simultaneously Figure 12, it is the cutaway view of A direction shown in Figure 10.Further, this spark plug comprises the grounding electrode 580 of three sheets, and the sheet plane parallel of this grounding electrode 580 is axial in cavity, and along on the inwall that radially is installed in the first circular cylindrical cavity 561a and the first horn-like cavity 561b in this igniting chamber 561.Angle between the grounding electrode 580 of these three sheets is equal, and it is three large spaces such as grade that the chamber 561 of should lighting a fire is divided equally.The setting of this grounding electrode 580 more is conducive to improve the ignition effectiveness of this spark plug 500.

Embodiment 6

Please consult simultaneously Figure 13 and Figure 16, wherein, Figure 13 is the structural representation of the spark plug 600 of the utility model embodiment six, and Figure 13 is the cutaway view of A direction shown in Figure 12.The spark plug 600 of the utility model embodiment six is roughly the same with the structure of the spark plug of embodiment five, difference only is: this spark plug 600 comprises a needle-like grounding electrode 680 with a radial width, this grounding electrode 680 is installed on the inwall of the first circular cylindrical cavity 661a in igniting chamber, and points to the end 122 of central electrode 120.The setting of this grounding electrode 680 more is conducive to improve the ignition effectiveness of this spark plug 600.Further, have spiral helicine groove or protuberance on the inwall of this igniting chamber 661, accelerated passage 662 and inlet chamber 663, form eddy airstream when guiding spark air-flow in it to discharge to the combustion chamber, the efficient that discharges with further raising spark.

Embodiment 7

Please consult simultaneously Figure 14, it is the structural representation of the spark plug 700 of the utility model embodiment seven.The spark plug 700 of the utility model embodiment seven is roughly the same with the structure of the spark plug of embodiment five, and difference only is: housing 760 sequentially comprises igniting chamber 761, accelerated passage 762 and the inlet chamber 763 that runs through vertically its upper and lower side.This igniting chamber 761 and accelerated passage 762 are the cylindricality cavity, and the aperture of this accelerated passage 762 is less than the aperture in this igniting chamber 761.This inlet chamber 763 comprises the second horn-like cavity 763b and the second circular cylindrical cavity 763a of connection, the aperture of the slot end of this second horn-like cavity 763b is consistent with the aperture of this accelerated passage 762 and be connected with it, the aperture of the wide mouth end of this second horn-like cavity 763b is consistent with the aperture of this second circular cylindrical cavity 763a, and this second circular cylindrical cavity 763a is towards the combustion chamber of internal combustion engine.Further, comprise a grounding electrode 780, this grounding electrode 780 is a stage body, on the inwall of the housing between this igniting chamber 761 and the accelerated passage 762, have a through hole that runs through bottom surface on it in the middle of it, the aperture of this through hole is consistent with the aperture of this accelerated passage 762.This grounding electrode 780 is circular along the section of direction perpendicular to axial direction.This central electrode 120 is positioned at this grounding electrode 180 in the face of the top of the upper bottom surface of this central electrode 120.This grounding electrode 780 is formed in one with this housing 760.

Embodiment 8

Please consult simultaneously Figure 15, it is the structural representation of the spark plug 800 of the utility model embodiment eight.The structure of the spark plug of itself and embodiment two is roughly the same, difference only is: " one " font that extend for the inwall to housing 260 end of the central electrode 820 of spark plug 800 822, and with further to guarantee the validity in the arcing gap between central electrode 820 and the grounding electrode 180.Wherein, the end 822 of this central electrode 820 can also replace with " ten " font or circle etc.

Embodiment 9

The structure of the spark plug of the structure of the spark plug of the utility model embodiment nine and embodiment one is roughly the same, and its difference only is to lead the structure of fiery unit.See also Figure 17, it is the planar structure schematic diagram of the fiery unit 990 of leading of the utility model embodiment nine.This is led fiery unit 990 and comprises that connecting portion 992, helical blade 994 and pair lead fiery section 998.This connecting portion 992 is annular, and the helical blade 994 of three mutual isogonism settings connects in the center of this annular connecting portion 992, and is fixedly connected with the medial surface of this connecting portion 192 respectively.This connecting portion 992 is connected with the port that fires of this housing, and dwindles gradually collar extension along Way out.This pair is led the intersection point place that fiery section 998 is arranged on this helical blade 994, comprises secondary connecting portion 998a and secondary helical blade 998b.This pair connecting portion 998a is similarly annular, and a plurality of secondary helical blade 998b isogonisms are arranged on the interior also therein heart place connection of annular space of this pair connecting portion 998a, and are fixedly connected with the medial surface of this pair connecting portion 998a respectively.

These 994 pairs of sparks of helical blade of leading fiery unit 990 carry out drainage and water conservancy diversion, form eddy airstream and concentrate to the combustion chamber eruption, have avoided firepower to diffusion all around.This pair is led fiery section 998 and further water conservancy diversion is carried out at the center of this eddy airstream, increases strength of vortex and the speed of central gas stream, and concentrate firepower has more further improved lighting-up rate and the combustion efficiency of internal combustion engine to a certain extent, is conducive to energy-conserving and environment-protective.

With respect to prior art, the spark plug that the utility model provides is arranged on central electrode and grounding electrode in the igniting chamber of housing, makes it have corrosion resistance.Then, arrange and lead fiery unit, by the helical blade of leading fiery unit spark is carried out drainage and water conservancy diversion, form eddy airstream and concentrate to the combustion chamber eruption, avoided firepower to diffusion all around.Further, by the aperture is set less than the accelerated passage of igniting chamber and inlet chamber in housing, when making the spark process accelerated passage of in the igniting chamber, lighting a fire, the structure that narrows rapidly by the aperture of accelerated passage is with the flow velocity of rapid increase spark air-flow, spark is seted out more fast, efficiently spark is guided in the combustion chamber of internal combustion engine, thereby shortened the time of kindling material arrival combustion chamber, namely relatively increased the burning time of the combustion mixture in the combustion chamber, fuel is burnt in internal combustion engine more fully, reach and concentrate efficient igniting, the effect of energy-saving and emission-reduction.

The utility model is not limited to above-mentioned execution mode, if various changes of the present utility model or distortion are not broken away from spirit and scope of the present utility model, if these changes and distortion belong within claim of the present utility model and the equivalent technologies scope, then the utility model also is intended to comprise these changes and distortion.

Claims

1. a spark plug is characterized in that, comprises

---insulator, it has the axis hole that extends along axis direction;

---central electrode, its insertion run through the axis hole of this insulator and expose the end;

---housing, it is hollow columnar, this housing is set in this insulator surface and makes the end of central electrode be positioned at this housing chamber;

---grounding electrode, it is arranged on the inwall of this housing;

---lead fiery unit, it is arranged on the port that fires of this housing, and this is led fiery unit and comprises helical blade, and this helical blade directly is connected with the port that fires of this housing, and perhaps this helical blade is fixed on the annular connecting portion that is connected with the port that fires of housing.

2. spark plug according to claim 1 is characterized in that: this leads the helical blade that fiery unit comprises that at least two mutual isogonisms arrange.

3. spark plug according to claim 2, it is characterized in that: the pair that also comprises the intersection point place that is arranged on this helical blade is led fiery section, it comprises secondary connecting portion and secondary helical blade, this pair connecting portion is annular, and secondary helical blade is arranged in the annular space of this pair connecting portion and with the medial surface of this pair connecting portion and is fixedly connected with.

4. according to claim 1 and 2 or 3 described spark plugs, it is characterized in that: sequentially comprise the igniting chamber, accelerated passage and the inlet chamber that run through its upper and lower side in the chamber of this housing, the aperture of this accelerated passage is less than the aperture of this igniting chamber and inlet chamber, and the end of this central electrode is positioned at this igniting chamber.

5. spark plug according to claim 4, it is characterized in that: this igniting chamber is a cylindricality cavity or horn-like cavity; Perhaps this igniting chamber sequentially comprises cylindricality cavity and the horn-like cavity of connection, and the slot of this horn-like cavity is connected with this accelerated passage.

6. spark plug according to claim 5, it is characterized in that: this accelerated passage is the cylindricality cavity.

7. according to claim 5 or 6 described spark plugs, it is characterized in that: this inlet chamber is cylindricality cavity or horn-like cavity;

Perhaps this inlet chamber sequentially comprises horn-like cavity and the cylindricality cavity of connection, and the slot of this horn-like cavity is connected with this accelerated passage.

8. spark plug according to claim 7 is characterized in that: have spiral helicine groove or protuberance on the inwall of this igniting chamber, accelerated passage and inlet chamber.

9. according to claim 2 or 3 described spark plugs, it is characterized in that: this grounding electrode is circular along section perpendicular to axial direction, the end of this central electrode be positioned at this grounding electrode along on the center of circle of a section perpendicular to axial direction.

10. according to claim 2 or 3 described spark plugs, it is characterized in that: this grounding electrode is a stage body, on the inwall of the housing between this igniting chamber and the accelerated passage, the centre of this grounding electrode has a through hole that runs through bottom surface on it, this through hole is communicated with this accelerated passage, and this central electrode is positioned at this grounding electrode in the face of the top of the upper bottom surface of this central electrode.

11. according to claim 2 or 3 described spark plugs, it is characterized in that: this grounding electrode is to have the spicule of radial width or be plates, and it is arranged on the inwall that housing is positioned at its igniting chamber, and along the radial finger in igniting chamber to central electrode.

12. spark plug according to claim 11 is characterized in that: comprise at least two grounding electrodes, it is equal angular to be arranged on the igniting cavity wall of housing.

13. according to claim 2 or 3 described spark plugs, it is characterized in that: the end of this central electrode is " one " font or " ten " font or circle.