CN204205284U - A kind of spark plug - Google Patents
A kind of spark plug Download PDFInfo
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- CN204205284U CN204205284U CN201420574591.9U CN201420574591U CN204205284U CN 204205284 U CN204205284 U CN 204205284U CN 201420574591 U CN201420574591 U CN 201420574591U CN 204205284 U CN204205284 U CN 204205284U
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Abstract
A kind of spark plug, comprises insulator, central electrode, housing, top cover and grounding electrode.This insulator has the axis hole that extends in the axial direction and its end has concave space in; Central electrode, its insertion runs through the axis hole of this insulator and its end exposes in described interior concave space; This housing is set in this insulator surface; Between this insulator and housing, formation one is around the annular space of this interior concave space; Top cover, its lid is located at the end of this housing, and is adjacent to the end edge of this insulator; An ignition space and combustion-supporting space is formed between described insulator and this top cover.Grounding electrode, it is arranged on top cover, and and forms the firing end portion with spark-discharge gap between the end of central electrode.Relative to prior art, spark plug of the present utility model can ensure that the requirement of the calorific value adjustment in plug ignition portion reaches the normal working temperature 450-850 degree of spark plug, can be improved again the mobility of gas and allow air-flow orientation effectively discharge.
Description
Technical field
The utility model relates to a kind of igniting field of internal combustion engine, especially relates to a kind of spark plug.
Background technology
Internal combustion engine is after liquid or gaseous fuel being mixed with air, and the high compression combustion chamber burning outburst directly inputting cylinder internal produces power.Be a kind of heat engine of mechanical energy by thermal energy.Spark plug is installed on internal combustion engine, for the sparking of the mist in combustion chamber.Refer to Fig. 1, it is the structural representation of prior art spark plug 13.This spark plug 13 comprises a central electrode 132, insulator 134, housing 136 and grounding electrode 138.This insulator 134 is ceramics insulator, has the axis hole extended in the axial direction, and this central electrode 132 inserts the axis hole running through this insulator 134.This housing 136 is arranged on the periphery of this insulator 134, and the surface of housing 136 has screw thread.This grounding electrode 138 is connected with the end of this housing 136, and bending extension is relative with central electrode 132, and forms the gap of sparkover between central electrode 132.Form firing end portion between this central electrode 132 and grounding electrode 138, this firing end portion produces electric arc by the effect of pulse power, and then produces the mist of spark ignition surrounding them, reaches the object of automatic ignition.Because the operational environment of spark plug is exceedingly odious, this central electrode 132 and grounding electrode 138 need igniting many times in combustion chamber under high-temperature and high-pressure conditions, and this electrode there will be deposit and cause it to corrode, and cause being worse off of spark plug.
In order to slow down the speed of worsening of spark plug, technical staff has carried out various improvement to spark plug.As the corrosion resistance by improving electrode material or increase number of electrodes overcome the etching problem of electrode.But the corrosion resistance improving electrode material needs to propose new electrode material, cannot change the etching problem of electrode when adopting existing electrode material; For arranging multiple electrode simultaneously, because the plurality of electrode exposes to the open air in a combustion chamber equally, will suffer erosion simultaneously, fundamentally can not solve the anticorrosive problem of electrode.
Or central electrode and grounding electrode are arranged in the cavity of housing.Refer to Fig. 2, it is the structural representation of another spark plug in prior art.This spark plug comprises shell and is fixedly installed in the insulated ceramic core in shell; This insulated ceramic core is built with central electrode 7; The upper end of this central electrode is stretched out insulated ceramic core and is formed an electric discharge end 17; This shell has a flame chamber 11, and this electric discharge end 17 is in flame chamber; The grounding electrode 13 close to electric discharge end is provided with in this flame chamber 11.The discharge ignition apparatus that central electrode and grounding electrode are formed is arranged in flame chamber 11, first light the air mixture in flame chamber 11, the mist of the flame ignition combustion chambers of internal combustion engines that recycling flame chamber 11 sprays, create one and put fire environment efficiently, and reduce sedimental deposition velocity on electrode.
But spark plug is arranged in the cylinder body of engine, it has the process of being heated and dispelling the heat when engine operation.Being heated is the temperature coming from engine, and usual heating temperature this temperature is set in a controlled range by the cycle cooling system of engine when designed engines.In addition, spark plug self also has a process of dispelling the heat, and as inserted copper core at sparking-plug electrode center, assembles to prevent heat the phenomenon producing fusing at electrode.If but heat is taken away rapidly during igniting, ignition energy can be caused again not enough, reduce the combustion efficiency of gas mixture, thus affect the power of engine.Therefore, the calorific value of spark plug is as the key technology of spark plug to engine ignition.The radiating rate of spark plug design is fast, and the calorific value of spark plug is just high, and radiating rate is slow, and calorific value is just low.The normal working temperature of spark plug is that this temperature range is called the self-cleaning temperature of spark plug at 450 ° ~ 850 °.When temperature is lower than 450 °, gas mixture very easily produces carbon distribution at plug ignition end, and causes the phenomenon of short circuit or spark plug no flashover; When temperature is higher than 850 °, then can produce incandescent ignition phenomenon, namely gaseous mixture is due to red-hot and light instead of lighted by spark-discharge, causes the phenomenon occurring engine advanced ignition.In addition, at motor vehicle in the process of moving, different running environments also can make there is different requirements to the working temperature of spark plug.As driven in the urban district comparatively blocked up, often start-stop stops, then engine is in low car of changing one's profession for a long time, now spark plug is easily in the too low situation of temperature thus causes misfire, now should select the spark plug that calorific value is low, slow down radiating rate, increase the own temperature of spark plug and reach the self-cleaning temperature requirement that spark plug normally works; When on long-term expressway, high load capacity height revolution is driven a vehicle on the contrary, then easily there is overheated situation in spark plug, now just should select the spark plug that calorific value is high, increase the radiating rate of spark plug, reduce the own temperature of spark plug, avoid the phenomenon causing scorification because of the temperature extremes that can bear beyond material of spark plug temperature.
Conventional ignition plug to calorific value design con-trol derive from the pottery of firing tip and be set in the space size that housing on spark plug pottery formed between them, this space is in skirt section, space, skirt section is large, gas heat after the burning that it holds will be many, after the heat absorption of pottery, the temperature being retained in spark plug is just relatively many, space, contrary skirt section is little, the gas heat held after burning will lack, the heat that spark plug is drawn onto by pottery will lack, and the amount of heat of cylinder body burning will be got rid of by valve.For in Fig. 2, central electrode and grounding electrode are arranged in the inner chamber of housing, its fire environment is surrounded by the housing of metal material, due to the requirement in design, contrast with the conventional ignition plug in comparable size, space, skirt section increases, and the temperature of ignitor can be allowed to increase, the calorific value of spark plug will reduce because electrode is arranged on the design in housing, the reduction of calorific value, can cause the rising of spark plug self heat, and the phenomenon likely causing spark plug to produce red-hot advanced ignition occurs.Thus this design of Fig. 2 does not consider that spark plug is need thermally equilibrated this work particular/special requirement in engine operation, do not consider this key factor that spark-plug heat value designs.
Utility model content
The purpose of this utility model is that the shortcoming overcoming prior art is with not enough, provides the spark plug that a kind of calorific value can adjust as requested, combustion efficiency is high.
The utility model is achieved through the following technical solutions: a kind of spark plug, comprises
---insulator, it has the axis hole extended in the axial direction, and the end of this insulator is provided with the isolation wall of an annular, and this isolation wall forms the inner chamber of hollow;
---central electrode, it inserts the axis hole running through this insulator, and its end is arranged in the inner chamber of described isolation wall;
---housing, it is hollow columnar, and this housing is set in this insulator surface; Between this insulator and housing, formation one is around the annular space of this isolation wall; The inner space of this ambient and this isolation wall;
---top cover, its lid is located at the end of this housing, and is adjacent to the tip edge of the isolation wall of this insulator end; Form the ignition space of this spark plug between the inner chamber of described isolation wall and this top cover, between this annular space and top cover, form combustion-supporting space; Described top cover is provided with the first through hole in ignition space region, is provided with the second through hole at combustion-supporting area of space;
---grounding electrode, on the metal parts that it is arranged on top cover or top cover extends to ignition space, and and forms the firing end portion with spark-discharge gap between the end of central electrode.
Compared to prior art, the central electrode of spark plug of the present utility model is arranged in housing, avoids and occurs deposit and the situation causing it to corrode, improve its useful life.Secondly, this top cover has with the inner chamber junction of isolation wall and extends the ceramic inner walls face that metal parts againsts ignition space, for adjusting the area of metal and pottery in ignition space, adjusting the working temperature of ignition space, allowing spark plug reach the thermal value range of design.According to different operational environments, the spark plug of different calorific value can be used, thus the incandescent ignition problem avoided calorific value too low and occur, or the too high and incomplete combustion occurred of calorific value and the problem of carbon distribution.Further, the setting in this plug ignition space and combustion-supporting space, can improve ignition effectiveness and the power of spark plug further, thus improve the combustion efficiency of internal combustion engine.
Spark plug new construction of the present utility model, can ensure that the requirement of the calorific value adjustment in plug ignition portion reaches the normal working temperature 450-850 degree of spark plug, the mobility of gas can be improved again and allow the directed effectively release of air-flow: arrive ignition space at compression stroke fuel and air gas mixture and can fully mix, the ignition space of expansion stroke and combustion-supporting space fuel can directed discharge to combustion chamber efficiently.
Further, described insulator end has dug concave space in, forms described isolation wall by the sidewall of this interior concave space.
Be further used as another kind of the present utility model to improve, the end sleeve of described insulator is provided with an insulation external member, forms described isolation wall by this insulation external member; Described insulation external member is provided with at least one third through-hole, and this third through-hole is communicated in inner chamber and the annular space of insulation external member.
Compared to prior art, the utility model is surrounded by this insulation external member end to this central electrode, can be avoided and occurs deposit and the situation causing it to corrode, improve its useful life.Secondly, by changing the calorific value during scale accurate adjustment spark plug work utilizing the usable floor area of the space wall of metal and ceramic bi-material in ignition space, can according to different operational environments, use the spark plug of different calorific value, thus avoid the calorific value of spark plug design too low, dispelled the heat slow, the red-hot advanced ignition problem that the heat of spark plug self is too high and occur, or calorific value design is too high, heat radiation is too fast, causes the heat of self of spark plug too low and the problem of the incomplete combustion that occurs and carbon distribution., directly coordinated by this insulation external member and top cover meanwhile, define an ignition space A between the inner chamber and top cover of this insulation external member, the combustion-supporting space B between this annular space and top cover.The magnitude relationship between fine adjustment ignition space A and combustion-supporting space B can be carried out by insulation external member.
Further, described third through-hole is less than the first through hole and the second through hole respectively.Space in original housing is separated out relatively independent functional space-ignition space and combustion-supporting space by the structure that the utility model is arranged in housing, third through-hole UNICOM is had between two relatively independent spaces, object is that when improving compression stroke, gas in the jar enters ignition space by the first through hole and has the second through hole to enter the mobility of the gas in combustion-supporting space, third through-hole is less than the first and second through holes, object is after the electrode of spark plug produces pulse energy igniting, the gaseous fuel lighted in ignition space can directly in a large number be discharged in cylinder body at the first through hole, the fire fuel of part can light the fuel in combustion-supporting space by third through-hole, because the second through hole is greater than third through-hole, therefore also can go out directly to cylinder injection by a large amount of energy, therefore the structural design that the setting varied in size in three holes is different with combustion-supporting space size with ignition space is utilized, the orientation of the gas flow before increasing igniting and after igniting is efficiently discharged in cylinder body, the combustion efficiency of spark plug can be effectively improved, at two relatively independent spatial orientations to when producing the bulbs of pressure in cylinder, this power can superposition on piston, therefore be can to the initial torsion increasing engine to a certain extent.
Further, described insulation external member is hollow round table shape, and one end is slot end, and one end is wide mouth end; Described insulation external member is set on insulator, and the slot end of this insulation external member is fixedly connected with this insulator, and this wide mouth end and described top cover are close to; Described third through-hole is arranged on the side of this insulation external member.
Improve as another kind of the present utility model, described insulation external member is hollow cylindrical; Described insulation external member is set on insulator, and one end of this insulation external member is fixedly connected with this insulator, and the other end and this top cover are close to; Described third through-hole is arranged on the side of this insulation external member.
Further, described top cover comprises a caping and is arranged on this caping lower surface and the fin corresponding with this insulator end shape; The space that housing and top cover are formed between interior concave space and annular space, and is divided into ignition space and combustion-supporting space by this fin; Described fin is provided with at least one third through-hole being communicated with ignition space and combustion-supporting space, and this third through-hole is less than the first through hole and the second through hole respectively.
Further, described fin is zigzag, and the indentation of this fin forms the third through-hole being communicated with ignition space and combustion-supporting space; Or the end of described insulator is zigzag, the indentation of this insulator end forms the third through-hole being communicated with ignition space and combustion-supporting space.
Further, described insulation external member and this insulator one-body molded.
Further, this grounding electrode is arranged on the inwall of the first through hole of this top cover;
Or this grounding electrode is arranged on the inwall of the first through hole of top cover on the end that ignition space inwall extends;
Or this grounding electrode is arranged on the center of this first through hole and just right with this central electrode, and this grounding electrode is connected with this top cover by least one connecting rod;
Or this grounding electrode is arranged on the center of this first through hole and just right with this central electrode, and this grounding electrode extends in ignition space, and by least one connecting rod and this top cover company.
Further, described grounding electrode is connected with this top cover by least two connecting rods, and described each connecting rod is flaabellum shape, and this first through hole is divided into two or more region.
Further, described top cover is provided with an extension metal parts with the inner chamber junction of isolation wall; The inner chamber of described isolation wall is ceramic inner walls face, and described extension metal parts is connected with this ceramic inner walls face.By being arranged on the extension metal parts of the inner chamber junction of this top cover and isolation wall, thus adjust metal and ceramic area scale in ignition space, the working temperature of adjustment ignition space, allows spark plug reach the thermal value range of design.Because heat dissipation metal is fast, ceramic heat-dissipating is slow, if need low-calorie spark plug, temperature in plug ignition space will be improved, need to reduce the area ratio that casting coping extends into ceramic space, metallic area reduces, and the thermal loss in space will slow down, and the temperature in ignition space will improve by the requirement of design.If need the spark plug of high heating value, the temperature in plug ignition space will be reduced, need to increase the area that casting coping extends into interior ceramic surface, the thermal diffusivity of metal is faster than ceramic heat-dissipating, and the temperature in ignition space will reduce according to the requirement of design.
Below in conjunction with Figure of description, spark plug of the present utility model is described in detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of spark plug of the prior art.
Fig. 2 is the structural representation of another kind of spark plug in prior art.
Fig. 3 is embodiment 1 structural representation of spark plug of the present utility model.
Fig. 4 is the connection diagram of the top cover shown in Fig. 3 and insulator.
Fig. 5 is the structural representation of the embodiment 2 of spark plug of the present utility model.
Fig. 6 is the perspective view of insulation external member.
Fig. 7 is the connection diagram of insulation external member and insulator and top cover.
Fig. 8 is the structural representation of caping in embodiment 3.
Fig. 9 is the stereogram of the caping of the present embodiment.
Embodiment
embodiment 1
Please refer to Fig. 3, it is embodiment 1 structural representation of spark plug of the present utility model.This spark plug 20 comprises central electrode 21, insulator 24, housing 26 and top cover 28.This insulator 24 is ceramics insulator, and it has the axis hole extended in the axial direction, and the end of this insulator 24 has concave space 242 in.This central electrode 21 inserts and runs through the axis hole of this insulator 24, and in this interior concave space 242 exposed end 211.This housing 26 is hollow structure, is set in the surface of this insulator 24, and forms one between this housing 26 and insulator 24 around the annular space 262 of this interior concave space 242.This top cover 28 lid is located at the end of this housing 26, and is adjacent to the end edge of this insulator 24.Grounding electrode (not shown) is arranged on top cover, and forms the firing end portion with spark-discharge gap between the end 211 of central electrode 21.Thus, form the ignition space A of this spark plug between the interior concave space 242 of this insulator 24 and top cover 28, between this annular space 262 and top cover 28, form combustion-supporting space B.
Please refer to Fig. 4, it is the connection diagram of top cover 28 shown in Fig. 3 and insulator.This top cover 28 comprises circular caping 282 and is arranged on the fin 284 corresponding with insulator 24 end shape of caping 282 lower surface, and this fin 284 is zigzag.Top cover is divided into middle ignition zone (not shown) and the combustion-supporting region (not shown) around ignition zone by this fin 284.The middle part of this ignition zone has the first through hole 285, and this combustion-supporting region has the second through hole 286.This top cover 28 lid is located at the end of this housing, and its fin 28 is adjacent to the end edge of insulator 24, and this ignition zone 282a is corresponding to this interior concave space 242 to form ignition space A, and this combustion-supporting region 282b is corresponding to this annular space 262 to form combustion-supporting space B.The indentation of this fin 28 forms the third through-hole 287 being communicated with ignition space and combustion-supporting space.First through hole 285 of this top cover 28 is communicated with this ignition space A, and this second through hole 286 is communicated with this combustion-supporting space B, thus realize this ignition space A and combustion-supporting space B respectively with being communicated with of combustion chambers of internal combustion engines.
The volume of this ignition space A and the volume size of this combustion-supporting space B different, to realize convection current between relatively airtight ignition space A and combustion-supporting space B and circulation.This be due to, start in the process terminated in compression stroke, the volume of the burning indoor gas of cylinder is gradually reducing, its internal gas pressure is caused constantly to increase, thus produce pressure differential between this combustion chamber and ignition space A and between combustion chamber and combustion-supporting space B, and then mist is promoted from combustion chamber to ignition space A and combustion-supporting space B.When mist is pushed into the ignition space A of spark plug and the moment of combustion-supporting space B by combustion chamber, the active force produced in same space is the same; When if when this ignition space is consistent with the volume in combustion-supporting space, and when the gas of ignition space will enter combustion-supporting space by third through-hole by active force, combustion-supporting space also can produce reaction force and stop gas to enter, gas pressure in two spaces reaches identical, and gas just cannot flow in ignition space and combustion-supporting space.Again due to the mixture that gas is by fuel and air, if two spaces can not persistent loop convection current, then the efficiency of burning can be reduced.Therefore, the volume size of ignition space A and combustion-supporting space B must be made different, produce larger pressure in the space that the space meeting specific volume that such volume is little is large and produce pressure differential, under the promotion of pressure differential, while gas inlet point fire space A and combustion-supporting space B, the gas between the two space also produces flowing.The gas of flowing is more conducive to the mixing of air and fuel molecule.
In addition, the setting of interior concave space 242, can make the size of the volume ratio of this ignition space A and combustion-supporting space B accurately determine.This is because, the interior concave space of this insulator can be once one-body molded when manufacturing insulator, therefore its size and volume size can accurately be determined, then need to rush miller skill at manufacture top cover, every part all unavoidably exists certain error.Therefore, directly being adjusted the volume ratio in ignition space and combustion-supporting space by the size of interior concave space, is optimum mode.
Further, the aperture of this first through hole 285 and the second through hole 286 is all greater than third through-hole 287.After this plug ignition, first the mist of ignition space A is lighted rear undergoes rapid expansion, discharges and the mist in combustion-supporting space B that ignited by third through-hole 287 respectively by the first through hole 285 directly to the combustion chamber that pressure is lower; Mist in combustion-supporting space B lights rear undergoes rapid expansion, is discharged directly to combustion chamber by the second through hole 286.Because the aperture of the first through hole 285 and the second through hole is greater than third through-hole 287, thus ignition space A and combustion-supporting and space B fire after gas more directly can be released into combustion chamber and avoid in the two space free.
When the induction stroke of internal combustion engine, the mist that fuel and air are formed is full of the cylinder body of combustion chamber simultaneously, because the pressure in cylinder body is much larger than the pressure of plug ignition end, mist is advanced into rapidly the ignition space A of spark plug and combustion-supporting space B, and the mist between this ignition space A and combustion-supporting space B is by third through-hole 287 convection current.
And when the pulse firing of spark plug, mist around central electrode 21 in ignition space A and the ignitor that discharges between grounding electrode, gas now in ignition space A is ignited and undergoes rapid expansion, pressure increases rapidly, and then promotion spark is discharged to cylinder body direction by the first through hole 285.Simultaneously, the spark of this ignition space A to be ignited the mist stored in combustion-supporting space B by third through-hole 287, mist in combustion-supporting space B fires rear undergoes rapid expansion, its spark is discharged directly to cylinder body direction by the second through hole 286 simultaneously, makes spark plug can provide power more constantly at firing stroke.
Further, described top cover is provided with an extension metal parts with the inner chamber junction of isolation wall; The inner chamber of described isolation wall is ceramic inner walls face, and described extension metal parts is connected with this ceramic inner walls face.By being arranged on the extension metal parts of the inner chamber junction of this top cover and isolation wall, thus adjust metal and ceramic area scale in ignition space, the working temperature of adjustment ignition space, allows spark plug reach the thermal value range of design.Because heat dissipation metal is fast, ceramic heat-dissipating is slow, if need low-calorie spark plug, temperature in plug ignition space will be improved, need to reduce the area ratio that casting coping extends into ceramic space, metallic area reduces, and the thermal loss in space will slow down, and the temperature in ignition space will improve by the requirement of design.If need the spark plug of high heating value, the temperature in plug ignition space will be reduced, need to increase the area that casting coping extends into interior ceramic surface, the thermal diffusivity of metal is faster than ceramic heat-dissipating, and the temperature in ignition space will reduce according to the requirement of design.
In addition, as the variant embodiment of the present embodiment, the fin on this top cover 28 can be non-zigzag, correspondingly between itself and the end edge of insulator 24 arranges, and produces the gap of a determining deviation.Described gap is equal to third through-hole, and the spacing in this gap is less than the aperture of this first through hole and the second through hole.Or the end of described insulator is set to zigzag, and the indentation of this insulator end forms the third through-hole being communicated with ignition space and combustion-supporting space.
Relative to prior art, the central electrode 21 of spark plug of the present utility model is arranged in housing, avoids and occurs deposit and the situation causing it to corrode, improve its useful life.Secondly, the end being arranged on insulator by central electrode arranges in the ignition space of interior concave space and casting coping formation, utilize that heat dissipation metal is fast and ceramic heat-dissipating is slow, the thermal diffusivity of bi-material different feature, the ratio of the usable floor area of metal and pottery is adjusted in ignition space, just can the work of accurate adjustment spark plug time calorific value, allow central electrode and lateral electrode produce requirement that pyrophoric working temperature environment reaches normal work.Can also according to the requirement of different operational environments, design the spark plug of different calorific value, thus it is too low to avoid spark-plug heat value to design, the red-hot advanced ignition problem that temperature in plug ignition space is too high and occur, or calorific value design is too high, the temperature in ignition space is too low and the problem of the incomplete combustion that occurs and carbon distribution.Further, the setting in this plug ignition space and combustion-supporting space, can improve ignition effectiveness and the power of spark plug further, thus improve the combustion efficiency of internal combustion engine.
embodiment 2
The spark plug of the present embodiment 2 and the roughly the same of embodiment 1, its Structure composing distinguishing insulator and the ignition space A being only spark plug is different.Refer to Fig. 5, it is the structural representation of the embodiment 2 of spark plug of the present utility model.This spark plug 30 comprises central electrode 31, insulator 34, insulation external member 35, housing 36 and top cover 38.This insulator 34 is ceramics insulator, and it has the axis hole extended in the axial direction.This central electrode 31 inserts the axis hole running through this insulator 34, and exposed end 311.This insulation external member 35 is set in the end of this insulator 34, and makes the end 311 of this central electrode 31 be positioned at this insulation external member 35.This housing 36 is hollow structure, is set in the surface of this insulator 34, and this insulation external member 35 is between insulator 34 and housing 36, and this housing 36 and insulator 34 and insulate between external member 35 and form an annular space 362.This top cover 38 lid is located at the end of this housing 36, and is adjacent to the end edge of this insulation external member 35.Grounding electrode (not shown) is arranged on top cover, and forms the firing end portion with spark-discharge gap between the end 311 of central electrode 31.Thus, form the ignition space A of this spark plug between the inner chamber of this insulation external member 35 and top cover 38, between this annular space 362 and top cover 38, form combustion-supporting space B.
Refer to Fig. 6 and Fig. 7, wherein, Fig. 6 is the perspective view of insulation external member 35, and Fig. 7 is the connection diagram of insulation external member 35 and insulator 34 and top cover 28.
Described insulation external member 35 is hollow round table shape, and one end is slot end 352, and one end is wide mouth end 353; Described insulation external member 35 is set on the end of insulator 34, and the slot end 352 of this insulation external member 35 is fixedly connected with this insulator 34, and this wide mouth end 353 is close to described top cover 28; The side of this this insulation external member is provided with at least one third through-hole 351.Described insulation external member 35 can make separately, then is fixed on described insulator, also can be one-body molded with described insulator.In the present embodiment, described insulation external member and described insulator are integrated.
In the present embodiment, surrounded by this insulation external member 35 end to this central electrode 31, can avoid occurring deposit and the situation causing it to corrode, and improve its useful life., directly coordinated by this insulation external member 35 and top cover 38 meanwhile, define an ignition space A between the inner chamber and top cover 38 of this insulation external member 34, the combustion-supporting space B between this annular space 362 and top cover 38.
The volume size of the volume of ignition space A and this combustion-supporting space B is different, can realize the convection current between relatively airtight ignition space A and combustion-supporting space B and circulation.Therefore, in order to the size between accurate adjustment ignition space A and combustion-supporting space B, fine adjustment can be carried out by insulation external member.
As the variant embodiment of the present embodiment, described insulation external member is hollow cylindrical; Described insulation external member is set on insulator, and one end of this insulation external member is fixedly connected with this insulator, and the other end and this top cover are close to; Described third through-hole is arranged on the side of this insulation external member.
embodiment 3
The spark plug of the present embodiment 3 and the roughly the same of embodiment 1, its difference is only that the caping structure of top cover is different.
Please refer to Fig. 8, it is the vertical view of the caping of the present embodiment, and described caping 481 center is provided with the first through hole 285, and described grounding electrode is arranged on the center of this first through hole 285, and just right with this central electrode.The edge bottom of described first through hole 285 is provided with fin (not shown), and the end edge of described fin and insulator is close to.Be provided with multiple second through hole 286 between described first through hole 285 and the edge of caping 481, described first through hole 285 is communicated with this ignition space A, and described second through hole 286 is communicated with this combustion-supporting space B.
Described grounding electrode is connected with this caping 481 by least one connecting rod 4823.In the present embodiment, described grounding electrode is connected with this caping 481 by three connecting rods 4823, and this first through hole 285 is divided into two or more region.
Refer to Fig. 9, it is the stereogram of the caping for the present embodiment.Another kind as the present embodiment improves, and described each connecting rod 4823 is flaabellum shape.
When after this plug ignition, first the mist of ignition space A is lighted rear undergoes rapid expansion, discharges and the mist in combustion-supporting space B that ignited by third through-hole 287 respectively by the first through hole 285 directly to the combustion chamber that pressure is lower; Mist in combustion-supporting space B lights rear undergoes rapid expansion, is discharged directly to combustion chamber by the second through hole 286.
In the present embodiment, further the caping 482 of this top cover 28 is optimized design.By use connecting rod 4823 work first through hole 285 is divided into multiple region, be convenient to the adjustment of pore size in the fabrication process.Secondly, each connecting rod 4823 is set to flaabellum shape, can guides and form eddy airstream when the spark air-flow of passage of igniting discharges to combustion chamber, to improve the efficiency of spark release further.
In addition, as the distortion of the present embodiment, described annulus inside can not arrange first connecting rod, also can increase first connecting rod arbitrarily using inner for whole annulus as the first through hole, forms multiple first through hole in this annulus inside.
The structure of the above-mentioned segmentation plug-in unit of the utility model is not limited to above-described embodiment, and the architectural feature in each embodiment rationally can be intersected and is combined, to be suitable for the spark plug of different model.The utility model is not limited to above-mentioned execution mode, if do not depart from spirit and scope of the present utility model to the various change of utility model or distortion, if these are changed and distortion belongs within claim of the present utility model and equivalent technologies scope, then the utility model is also intended to comprise these changes and distortion.
Claims (11)
1. a spark plug, is characterized in that, comprises
---insulator, it has the axis hole extended in the axial direction, and the end of this insulator is provided with the isolation wall of an annular, and this isolation wall forms the inner chamber of hollow;
---central electrode, it inserts the axis hole running through this insulator, and its end is arranged in the inner chamber of described isolation wall;
---housing, it is hollow columnar, and this housing is set in this insulator surface; Between this insulator and housing, formation one is around the annular space of this isolation wall; The inner space of this ambient and this isolation wall;
---top cover, its lid is located at the end of this housing, and is adjacent to the tip edge of the isolation wall of this insulator end; Form the ignition space of this spark plug between the inner chamber of described isolation wall and this top cover, between this annular space and top cover, form combustion-supporting space; Described top cover is provided with the first through hole in ignition space region, is provided with the second through hole at combustion-supporting area of space;
---grounding electrode, it is arranged on top cover, and and forms the firing end portion with spark-discharge gap between the end of central electrode.
2. spark plug according to claim 1, is characterized in that: described insulator end has dug concave space in, forms described isolation wall by the sidewall of this interior concave space.
3. spark plug according to claim 1, is characterized in that: the end sleeve of described insulator is provided with an insulation external member, forms described isolation wall by this insulation external member.
4. spark plug according to claim 3, is characterized in that: described insulation external member is hollow round table shape, and one end is slot end, and one end is wide mouth end; Described insulation external member is set on insulator, and the slot end of this insulation external member is fixedly connected with this insulator, and this wide mouth end and described top cover are close to.
5. spark plug according to claim 3, is characterized in that: described insulation external member is hollow cylindrical; Described insulation external member is set on insulator, and one end of this insulation external member is fixedly connected with this insulator, and the other end and this top cover are close to.
6. the spark plug according to Claims 2 or 3, is characterized in that: described top cover comprises a caping and is arranged on this caping lower surface and isolates fin corresponding to wall end shape with this insulator; Described fin is zigzag, and the indentation of this fin forms the third through-hole being communicated with ignition space and combustion-supporting space; Or the end of described insulator is zigzag, the indentation of this insulator end forms the third through-hole being communicated with ignition space and combustion-supporting space, and third through-hole is less than the first through hole and the second through hole respectively.
7. the spark plug according to Claims 2 or 3, is characterized in that: described top cover comprises a caping and is arranged on this caping lower surface and isolates fin corresponding to wall end shape with this insulator; Have gap between described fin and this insulator edge, this gap forms the third through-hole in connectivity points fire space and combustion-supporting space; The spacing in described gap is less than the aperture of the first through hole and the second through hole respectively.
8. the spark plug according to claim 4 or 5, is characterized in that: described insulation external member and this insulator one-body molded.
9. the spark plug according to claim 1-5 any one, is characterized in that: this grounding electrode is arranged on the inwall of the first through hole of this top cover;
Or this grounding electrode is arranged on the inwall of the first through hole of top cover on the end that ignition space inwall extends;
Or this grounding electrode is arranged on the center of this first through hole and just right with this central electrode, and this grounding electrode is connected with this top cover by least one connecting rod;
Or this grounding electrode is arranged on the center of this first through hole and just right with this central electrode, and this grounding electrode extends in ignition space, and by least one connecting rod and this top cover company.
10. spark plug according to claim 9, is characterized in that: described grounding electrode is connected with this top cover by least two connecting rods, and described each connecting rod is flaabellum shape, and this first through hole is divided into two or more region.
11. spark plugs according to claim 10, its spy is: described top cover is provided with an extension metal parts with the inner chamber junction of isolation wall; The inner chamber of described isolation wall is a ceramic inner walls face, and described extension metal parts is connected with this ceramic inner walls face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420574591.9U CN204205284U (en) | 2014-09-30 | 2014-09-30 | A kind of spark plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420574591.9U CN204205284U (en) | 2014-09-30 | 2014-09-30 | A kind of spark plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204205284U true CN204205284U (en) | 2015-03-11 |
Family
ID=52663204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420574591.9U Withdrawn - After Issue CN204205284U (en) | 2014-09-30 | 2014-09-30 | A kind of spark plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204205284U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529616A (en) * | 2014-09-30 | 2016-04-27 | 张蝶儿 | Sparking plug |
| CN106549307A (en) * | 2015-09-21 | 2017-03-29 | 张蝶儿 | A kind of spark plug |
| CN106549303A (en) * | 2015-09-21 | 2017-03-29 | 张蝶儿 | A kind of spark plug |
| CN106549305A (en) * | 2015-09-21 | 2017-03-29 | 张蝶儿 | A kind of spark plug |
| CN110107406A (en) * | 2019-04-04 | 2019-08-09 | 中国人民解放军空军工程大学 | A kind of anode self cooled plasma igniter |
-
2014
- 2014-09-30 CN CN201420574591.9U patent/CN204205284U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529616A (en) * | 2014-09-30 | 2016-04-27 | 张蝶儿 | Sparking plug |
| CN105529616B (en) * | 2014-09-30 | 2017-07-25 | 张蝶儿 | A kind of spark plug |
| CN106549307A (en) * | 2015-09-21 | 2017-03-29 | 张蝶儿 | A kind of spark plug |
| CN106549303A (en) * | 2015-09-21 | 2017-03-29 | 张蝶儿 | A kind of spark plug |
| CN106549305A (en) * | 2015-09-21 | 2017-03-29 | 张蝶儿 | A kind of spark plug |
| CN106549307B (en) * | 2015-09-21 | 2019-02-05 | 张蝶儿 | A kind of spark plug |
| CN106549305B (en) * | 2015-09-21 | 2019-02-05 | 张蝶儿 | A kind of spark plug |
| CN110107406A (en) * | 2019-04-04 | 2019-08-09 | 中国人民解放军空军工程大学 | A kind of anode self cooled plasma igniter |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150311 Effective date of abandoning: 20170725 |