CN203119292U

CN203119292U - Spark plug

Info

Publication number: CN203119292U
Application number: CN 201320071735
Authority: CN
Inventors: 张蝶儿
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-02-07
Filing date: 2013-02-07
Publication date: 2013-08-07
Anticipated expiration: 2023-02-07

Abstract

The utility model relates to a spark plug which comprises an insulator, a central electrode, a shell, a grounding electrode and a fire guide unit. The insulator has an axle hole extending along an axis direction; the central electrode is inserted into the axle hole penetrating through the insulator, and the end part of the central electrode is exposed; the shell is hollow and cylindrical, is sleeved on the surface of the insulator and enables the end part of the central electrode to be located in a cavity of the shell; the grounding electrode is arranged on the inner wall of the shell; and the fire guide unit includes a fire guide part and through holes arranged on the fire guide part, an upper port and a lower port of the fire guide part are communicated, the upper port of the fire guide part is connected with a fire ejection port of the shell, and at least one through hole is arranged around the lower port of the fire guide part. The spark plug provided by the utility model is corrosion-resistant and can introduce and guide sparks to prevent firepower from being diffused all around, and concentrated firepower helps improve the 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 igniting.

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.And the firepower of spark plug ejection can be concentrated efficiently inadequately to diffusion all around, has reduced the combustion efficiency of internal combustion engine to a certain extent, is 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 is led fiery unit and comprises leading fiery portion and being arranged on this and lead through hole in the fiery portion, and this upper port and lower port of leading fiery portion connects, and its upper port is connected with the port that fires of housing, and at least one through hole is arranged on leads fiery subordinate's port periphery.

Further, this bore of upper port of leading fiery portion is greater than the bore of lower port, and a plurality of through holes are arranged on is equally spacedly leading the lower port periphery of fiery portion.

Further, this is led fiery unit and also comprises at least two helical blades, and it connects this helical blade in this center of leading fiery portion, and fixedlys connected with this medial surface of leading fiery portion respectively; Maybe this medial surface of leading fiery portion of leading fiery unit is provided with helical form and leads fiery fin or lead fiery groove.

Further, the pair that also comprises the intersection point place that is arranged on this helical blade is led fiery portion, 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 fixedlys connected.

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 the fiery portion of leading of fiery unit spark is carried out drainage and water conservancy diversion, the spark air-flow is concentrated 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.And, this through hole of leading fiery subordinate's port periphery can further improve the interior air-flow exchange of cavity of spark plug, especially in charging stage of compression stroke, this through hole can promptly import the fuel gas of spark plug circumferential perimeter in the cavity of spark plug, to increase the concentration of fuel gas in the cavity, further increase the ignition efficient of spark plug.

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.The outer wall of this housing 160 is provided with screw thread.Please consult Fig. 3 simultaneously, it is the perspective view of leading fiery unit 190 shown in Figure 2.This is led fiery unit 190 and comprises leading fiery portion 192 and being arranged on this and lead through hole 193 in the fiery portion 192.This upper port and lower port of leading fiery portion 192 connects, and its upper port is connected with the port that fires of housing.At least one through hole 193 is arranged on leads fiery subordinate's port periphery.In the present embodiment, this bore of upper port of leading fiery portion 192 is greater than the bore of lower port, and a plurality of through holes 193 are arranged on is equally spacedly leading the lower port periphery of fiery portion 192.

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, mist is ignited to expand rapidly in the back and to external eruption, when when leading fiery unit 190, lead 192 pairs of sparks of the fiery portion of leading of fiery unit 190 and carry out drainage and water conservancy diversion, the spark air-flow is concentrated to be 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.Further, this through hole 193 of leading fiery portion 192 lower port peripheries can further improve the interior air-flow exchange of cavity of spark plug 100, especially in charging stage of compression stroke, this through hole 193 can promptly import the fuel gas of spark plug circumferential perimeter in the cavity of spark plug, to increase the concentration of fuel gas in the cavity, further increase the ignition efficient of spark plug.

Further, also can helical form be set at this inwall of leading fiery portion 192 and lead fiery fin or lead fiery groove, spark is carried 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, thereby more efficiently spark has been guided in the combustion chamber of internal combustion engine.

Embodiment 2

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.The outer wall of this housing 160 is provided with screw thread.

Particularly, this housing 260 comprises igniting chamber 261, accelerated passage 262 and the inlet chamber 263 that runs through its upper and lower side vertically in regular turn.This igniting chamber 261 comprises the first circular cylindrical cavity 261a and the first horn-like cavity 261b of connection in regular turn, 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 Fig. 5 simultaneously, 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 Fig. 6 simultaneously, it is the perspective view of leading fiery unit 290 shown in Figure 4.This is led fiery unit 290 and comprises and lead fiery portion 292, through hole 293 and helical blade 294.This upper port and lower port of leading fiery portion 292 connects.A plurality of through holes 293 are arranged on is equally spacedly leading the lower port periphery of fiery portion 292.Comprise the helical blade 294 that three mutual isogonisms arrange in the present embodiment, it connects in this center of leading fiery portion 292, and fixedlys connected with this medial surface of leading fiery portion 292 respectively.This upper port of leading fiery portion 292 is connected with the port that fires of this housing 160, and dwindles collar extension gradually along the lower port direction.

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 burst out more fast, and when leading fiery unit 290,294 pairs of sparks of helical blade of leading fiery unit 290 carry out drainage and water conservancy diversion to spark again, form eddy airstream and concentrate and erupts 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, accelerates by accelerated passage 262 to guarantee at first the ignite gas in igniting chamber 261 of central electrode 261 after 261 igniting of igniting chamber 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, this through hole 293 can promptly import the fuel gas of spark plug circumferential perimeter in the inlet chamber of spark plug, to increase the concentration of mist in the cavity.In addition, 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 during this accelerated passage 262 of airflow of mixed gas process 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, promotes piston and is moved to lower dead center by top dead centre.Therefore, flow velocity increases when being lighted gas through accelerated passage 262 in the igniting chamber 261 of housing, 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, increased the burning time of the combustion mixture in the combustion chamber in expansion stroke relatively, 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 comprises igniting chamber 361, accelerated passage 362 and the inlet chamber 363 that runs through its upper and lower side vertically in regular turn.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 and lead fiery portion 392, through hole 394, helical blade 394 and be connected bridge 396.This is led fiery portion 392 and is annular, comprises the helical blade 394 that two mutual isogonisms arrange in the present embodiment, and it connects in this center of leading fiery portion 392, and fixedlys connected with this medial surface of leading fiery portion 392 respectively.This is led fiery portion 392 and connects by being connected 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 comprises igniting chamber 461, accelerated passage 462 and the inlet chamber 463 that runs through its upper and lower side vertically in regular turn.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 Figure 11 simultaneously, 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 comprises igniting chamber 561, accelerated passage 562 and the inlet chamber 563 that runs through its upper and lower side vertically in regular turn.This igniting chamber 561 comprises the first circular cylindrical cavity 561a and the first horn-like cavity 561b of connection in regular turn, 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 Figure 12 simultaneously, 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 equates that 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 Figure 13 and Figure 16 simultaneously, 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 Figure 14 simultaneously, 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 comprises igniting chamber 761, accelerated passage 762 and the inlet chamber 763 that runs through its upper and lower side vertically in regular turn.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 Figure 15 simultaneously, 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 leading fiery portion 992, through hole 993, helical blade 994 and pair leads fiery portion 998.This structure of leading fiery portion 992 and through hole 993 is identical with embodiment one, and the helical blade 994 of three mutual isogonism settings connects in this center of leading fiery portion 992, and fixedlys connected with the medial surface of leading fiery portion 992 respectively.This is led fiery portion 992 and is connected with the port that fires of this housing, and dwindles collar extension gradually along Way out.This pair is led the intersection point place that fiery portion 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 and heart place connection therein of annular space of this pair connecting portion 998a, and 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 portion 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, the through hole that the fiery subordinate's port of leading of fiery unit periphery is led in setting can improve the air-flow exchange in the cavity of spark plug, especially in charging stage of compression stroke, this through hole can promptly import the fuel gas of spark plug circumferential perimeter in the cavity of spark plug, to increase the concentration of fuel gas in the cavity, further increase the ignition efficient of spark plug.Further, 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 burst 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 increased the burning time of the combustion mixture in the combustion chamber relatively, 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, comprise leading fiery portion and being arranged on this and lead through hole in the fiery portion, this upper port and lower port of leading fiery portion connects, and its upper port is connected with the port that fires of housing, and at least one through hole is arranged on leads fiery subordinate's port periphery.

2. spark plug according to claim 1 is characterized in that: this bore of upper port of leading fiery portion is greater than the bore of lower port, and a plurality of through holes are arranged on is equally spacedly leading the lower port periphery of fiery portion.

3. spark plug according to claim 1, it is characterized in that: this is led fiery unit and also comprises at least two helical blades, and this helical blade connects in this center of leading fiery portion, and fixedlys connected with this medial surface of leading fiery portion respectively; Maybe this medial surface of leading fiery portion of leading fiery unit is provided with helical form and leads fiery fin or lead fiery groove.

4. spark plug according to claim 3, it is characterized in that: the pair that also comprises the intersection point place that is arranged on this helical blade is led fiery portion, 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 fixedlys connected.

5. according to each described spark plug in the claim 1～4, it is characterized in that: comprise the igniting chamber, accelerated passage and the inlet chamber that run through its upper and lower side in the chamber of this housing in regular turn, 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.

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

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

8. spark plug according to claim 5 is characterized in that: have spiral helicine groove or protuberance on the inwall of this igniting chamber, accelerated passage and inlet chamber.

9. spark plug according to claim 5, 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; Perhaps 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; Perhaps this grounding electrode is to have the spicule of radial width or for 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.

10. spark plug according to claim 9 is characterized in that: comprise at least two grounding electrodes, it is equal angular to be arranged on the igniting cavity wall of housing.