CN203434440U

CN203434440U - Spark plug

Info

Publication number: CN203434440U
Application number: CN201320237681.4U
Authority: CN
Inventors: 张蝶儿
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-05-03
Filing date: 2013-05-03
Publication date: 2014-02-12
Anticipated expiration: 2023-05-03

Abstract

The utility model relates to a spark plug. The spark plug comprises an insulator, a center electrode, a shell and grounding electrodes, wherein the insulator is provided with an axis hole extending along an axis direction, the center electrode is inserted into and passes through the axis hole of the insulator with an end portion of the center electrode exposed, the shell is of a hollow structure and is sleeved on the surface of the insulator with an end portion of the center electrode arranged inside the cavity of the shell, and the grounding electrodes are arranged on the inner walls of the shell and protrude out and are provided with through holes. The spark plug of the utility model has the advantages of corrosion resistance, efficient ignition as well as energy-saving and emission-reducing property.

Description

A kind of spark plug

Technical field

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

Background technology

Spark plug is to be installed to internal combustion engine (engine) above, for the sparking of the mist in combustion chamber.Refer to Fig. 1, it is the structural representation of spark plug 10 in 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 extending 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 between central electrode 12, forms the gap of sparkover.Effect by pulse electric power between this central electrode 12 and grounding electrode 18 produces electric arc, and then produces electric spark and light electrode mist around, reaches the object 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 in combustion chamber under high-temperature and high-pressure conditions, and on this electrode, there will be deposit and cause its corrosion, 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 by improving the corrosion resistance of electrode material or increasing the etching problem that number of electrodes overcomes electrode.But the corrosion resistance that improves electrode material need to propose new electrode material, in the situation that adopting existing electrode material, cannot change the etching problem of electrode; For a plurality of electrodes are set simultaneously, because the plurality of electrode exposes to the open air equally in combustion chamber, will suffer erosion simultaneously, can not fundamentally 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; Central electrode 7 is housed in this insulated ceramic core; 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; In this flame chamber 11, be provided with the grounding electrode 13 that approaches electric discharge end.The discharge ignition apparatus of central electrode and grounding electrode formation 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 of recycling flame chamber 11 ejections, create a some fire environment efficiently, and reduced sedimental deposition velocity on electrode.But, ignition gap 15 between this grounding electrode 13 and the electric discharge end 17 of central electrode is of crucial importance, must with interior, be beneficial to its electric discharge at certain distance, and this ignition gap 15 is too small and be unfavorable for that mist enters this discharging gap when induction stroke, also reduced to a certain extent the ignition effectiveness of spark plug.

Utility model content

The purpose of this utility model is to overcome the shortcoming of prior art with not enough, provides a kind of ignition effectiveness high and erosion-resisting spark plug.

The utility model is achieved through the following technical solutions: a kind of spark plug, comprises insulator, central electrode, housing and grounding electrode.Wherein, this insulator has the axis hole extending along axis direction; This central electrode inserts and runs through the axis hole of this insulator and expose end; This housing is hollow structure, is set in the surface of this insulator, and makes the end of this central electrode be positioned at the cavity of housing; This grounding electrode is arranged in this inner walls and protrudes, and is provided with through hole on it.

Further, this grounding electrode is sheet.

Further, this grounding electrode is ring-type, and its outer shroud is connected with the inwall of housing.

Further, the interior annular distance of this grounding electrode is triangle, square, polygon or circle.

And the openend of this housing has an arc slot structure progressively narrowing.

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, through-hole structure on this grounding electrode can promptly be introduced mist around central electrode in induction stroke, shorten mist and entered the central electrode time around, relatively increased the burning time of the combustion mixture in combustion chamber, made fuel in internal combustion engine, obtain burning more fully and reach the effect of efficient igniting, energy-saving and emission-reduction.

Accompanying drawing explanation

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

Fig. 2 is the structural representation of another spark plug of the prior art.

Fig. 3 is the cross-sectional view of the spark plug 100 of the utility model embodiment 1.

Fig. 4 is the structural representation of the grounding electrode 180 shown in Fig. 3.

Fig. 5 is the structural representation of grounding electrode 280 of the spark plug of the utility model embodiment 2.

Embodiment

embodiment 1

Refer to Fig. 3, it is the cross-sectional view of the spark plug 100 of the utility model embodiment 1.This spark plug 100 comprises a central electrode 120, insulator 140, housing 160 and grounding electrode 180.This insulator 140 is ceramics insulator, and it has the axis hole extending 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 structure, 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.On the outer wall of this housing 160, be provided with screw thread.

Please refer to Fig. 4, it is the structural representation of the grounding electrode 180 of spark plug shown in Fig. 1 100.This grounding electrode 180 protrudes from the inwall of this housing 160, and close to the end 122 of central electrode 120.In the present embodiment, this grounding electrode is ring-type, and its outer shroud is fixedly connected with the inwall of housing 160.On this grounding electrode 180, be provided with one or more through holes 182.

The end 122 of this central electrode 120 is arranged at the top of this grounding electrode 180 or is arranged at the ring heart of grounding electrode 180, and end 122 and the ignition gap of leading between fiery portion are 0.3mm～1.5mm, be beneficial to its electric discharge, this ignition gap can increase or reduce according to the designing requirement of ignition system simultaneously.

Due to the structure of above-mentioned grounding electrode 180, two spaces have been formed this housing 160 is interior: between this grounding electrode 180 and insulator 140, there is a mixed headroom B; The admission space D forming between this grounding electrode 180 and shell air inlet.

When the induction stroke of internal combustion engine, the pressure in admission space D is greater than the pressure in mixed headroom B, and mist enters mixed headroom B from admission space D by the gap between central electrode 120 and grounding electrode 180 and the through hole 182 grounding electrode 180.But because the gap between central electrode 120 and grounding electrode 180 is too narrow, and the barrier effect being positioned at due to central electrode 120, a large amount of mists cannot enter from the gap between central electrode 120 and grounding electrode 180 mixed headroom B; Therefore, a large amount of mists enters rapidly mixed headroom B by the through hole by grounding electrode 180 182, thereby efficiently mist is guided to mixed headroom B by the combustion chamber of internal combustion engine, and is covered with around central electrode 120.

When pulse firing, owing to having gathered rapidly a large amount of mists in mixed headroom B, it expands rapidly after being ignited, and the pressure in this mixed headroom B increases rapidly, promotes spark and discharges to admission space D direction.Thereby efficiently spark is guided in the combustion chamber of internal combustion engine.

Further, from prior art, the time of the compression stroke of internal combustion engine operation (being induction stroke) and expansion stroke is the set time, when the piston of internal combustion engine approaches 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, in compression stroke, a large amount of burning mixtures enters rapidly mixed headroom B by the through hole 182 of grounding electrode 180, shorten burning mixture and entered the time of mixing headroom B, and a large amount of mists of mixed headroom inner accumulated can gather more energy at spark ignition type, overcome the defect increasing because central electrode and grounding electrode being arranged on to the distance that causes spark to enter combustion chamber in the cavity of housing, relatively increased the burning time of the combustion mixture in combustion chamber in expansion stroke, fuel is burnt more fully in internal combustion engine, reach the effect of energy-saving and emission-reduction.

embodiment 2

Refer to Fig. 5, it is the structural representation of grounding electrode 280 of the spark plug of the utility model embodiment 2.The present embodiment comprises that two symmetries are fixedly installed on the grounding electrode 280 in inner walls, and each grounding electrode is sheet, and on it, has one or more through holes 282.The end 122 of this central electrode 120 is arranged at the top of this grounding electrode 180 or is arranged at the ring heart of grounding electrode 180, and the gap between end 122 and grounding electrode is that 1.0～3.0mm is beneficial to its electric discharge, according to the specification of existing spark plug, be generally 1.5mm or 2.5mm.The structure of this grounding electrode is beneficial to equally mist and enters in housing.

The utility model also has various deformation execution mode, as: in embodiment 1, annular distance is triangle, the arbitrary polygon such as square or for circular in grounding electrode; In embodiment 2, can comprise that two above with the grounding electrode of through hole.In addition, the openend of housing of the present utility model can have an arc slot structure progressively narrowing, further to improve the power that fires of this spark plug.

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 through hole being set on grounding electrode, the efficiency that enters central electrode near zone to improve mist.Shorten the time in mist arrival central electrode region, relatively increased the burning time of the combustion mixture in combustion chamber, fuel is burnt more fully in internal combustion engine, reached the effect of efficient igniting, 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 departed to spirit and scope of the present utility model, within if these changes and distortion belong to claim of the present utility model and equivalent technologies scope, the utility model is also intended to comprise these changes and distortion.

Claims

1. a spark plug, is characterized in that, comprises

---insulator, it has the axis hole extending along axis direction;

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

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

---grounding electrode, it is arranged in this inner walls and protrudes, and is provided with through hole on it.

2. spark plug according to claim 1, is characterized in that: this grounding electrode is sheet.

3. spark plug according to claim 1 and 2, is characterized in that: this grounding electrode is ring-type, and its outer shroud is connected with the inwall of housing.

4. spark plug according to claim 1 and 2, is characterized in that: the openend of this housing has an arc slot structure progressively narrowing.

5. spark plug according to claim 3, is characterized in that: the interior annular distance of this grounding electrode is polygon or circle.