WO2015113439A1

WO2015113439A1 - Sparking plug

Info

Publication number: WO2015113439A1
Application number: PCT/CN2014/091871
Authority: WO
Inventors: 张蝶儿
Original assignee: 张蝶儿
Priority date: 2014-01-29
Filing date: 2014-11-21
Publication date: 2015-08-06
Also published as: CN103746291B; CN103746291A

Abstract

A sparking plug (20) comprises an insulator (24), a central electrode (21), a housing (26), a flow guiding plug-in (28), and a grounding electrode (22). The insulator (24) is provided with a shaft hole extending in the axis direction. The central electrode (21) is inserted in the shaft hole penetrating through the insulator (24), and is exposed out of an end portion (211). The housing (26) is hollow column shaped and is sleeved on the surface of the insulator (24). The flow guiding plug-in (28) is columnar; a flaming hole (282) penetrating through the front end surface and the rear end surface of the flow guiding plug-in (28) is formed in the center of the flow guiding plug-in (28); the flow guiding plug-in (28) is fixedly disposed in the housing (26); the front end of the flow guiding plug-in (28) right faces the central electrode (21), and the rear end is located at the opening end of the housing (26); the outer wall of the flow guiding plug-in (28) is attached to the inner wall of the housing (26). The grounding electrode (22) is disposed on the inner wall of the housing (26) or is disposed on the periphery of the flaming hole (282) in the front end of the flow guiding plug-in (28), and an ignition end portion with a spark discharging gap is formed between the grounding electrode (22) and the end portion of the central electrode (21). The sparking plug avoids the generation of precipitates and the caused corrosion condition, thereby extending the service life of the sparking plug. The structure of the flow guiding plug-in can improve the ignition efficiency and the backflow efficiency of the sparking plug, thereby improving the combustion efficiency of an internal combustion engine.

Description

Spark plug

Technical field

The present invention relates to the field of ignition of internal combustion engines, and more particularly to a spark plug.

Background technique

The internal combustion engine is a mixture of liquid or gaseous fuel and air, and is directly input into the high-pressure combustion chamber inside the cylinder to generate explosive power. It is a heat engine that converts thermal energy into mechanical energy. The spark plug is mounted to the internal combustion engine for ignition of the mixed gas in the combustion chamber. Please refer to FIG. 1, which is a schematic structural view of a prior art spark plug 13. The spark plug 13 includes a center electrode 132, an insulator 134, a housing 136, and a ground electrode 138. The insulator 134 is a ceramic insulator having a shaft hole extending in the axial direction, and the center electrode 132 is inserted through a shaft hole penetrating the insulator 134. The housing 136 is disposed on the outer circumference of the insulator 134, and the surface of the housing 136 has a thread. The ground electrode 138 is connected to the end of the casing 136 and is bent to extend opposite to the center electrode 132 to form a gap of spark discharge with the center electrode 132. An ignition end portion is formed between the center electrode 132 and the ground electrode 138, and the ignition end portion generates an arc by the action of pulse electric power, thereby generating a mixed gas around the electrode by the electric spark to achieve the purpose of auto-ignition. Since the working environment of the spark plug is extremely harsh, the center electrode 132 and the ground electrode 138 need to be ignited many times under high temperature and high pressure conditions in the combustion chamber, and deposits may occur on the electrode and cause corrosion thereof, resulting in deterioration of the spark plug.

In order to slow down the deterioration of the spark plug, the technician has made various improvements to the spark plug. The corrosion problem of the electrode is overcome by increasing the corrosion resistance of the electrode material or increasing the number of electrodes. However, to improve the corrosion resistance of the electrode material, it is necessary to propose a new electrode material, and the corrosion problem of the electrode cannot be changed in the case of using the existing electrode material; for simultaneously setting a plurality of electrodes, since the plurality of electrodes are also exposed in the combustion chamber , will be eroded at the same time, and can not fundamentally solve the corrosion problem of the electrode.

Alternatively, the center electrode and the ground electrode are disposed within the cavity of the housing. Please refer to FIG. 2 , which is a structural schematic diagram of another spark plug in the prior art. The spark plug comprises an outer casing and an insulating ceramic core fixedly mounted in the outer casing; the insulating ceramic core is provided with a central electrode 7; the upper end of the central electrode protrudes from the insulating ceramic core to form a discharge end 17; the outer casing has a firing chamber 11, The discharge end 17 is in the firing chamber; the firing chamber 11 is provided with a ground electrode 13 near the end of the discharge. A discharge igniter composed of a center electrode and a ground electrode is disposed in the blast chamber 11, and the mixed gas in the blast chamber 11 is ignited first, and then the flame ejected from the combustion chamber 11 ignites the mixed gas of the combustion chamber of the internal combustion engine, thereby creating An efficient ignition environment and reduced deposition rate of deposits on the electrodes. However, in the case where the center electrode and the ground electrode are disposed in the cavity of the casing, the distance of the spark generated by the two electrodes into the combustion chamber is increased, thereby delaying the ignition time of the mixed gas of the combustion chamber due to the compression of the internal combustion engine. The time of the stroke and the expansion stroke is a fixed time, and the combustion time of the mixed gas is shortened, which reduces the combustion efficiency of the internal combustion engine to a certain extent, which is not conducive to energy conservation and environmental protection.

Summary of the invention

It is an object of the present invention to overcome the shortcomings and deficiencies of the prior art and to provide a spark plug having high combustion efficiency.

The invention is achieved by the following technical solution: a spark plug comprising an insulator, a center electrode, a housing, a flow guiding insert and a grounding electrode. The insulator has a shaft hole extending in the axial direction. The center electrode is inserted through the shaft hole of the insulator and exposes the end. The housing has a hollow column shape and is sleeved on the surface of the insulator. The flow guiding insert is a columnar body having a fire-breathing hole extending through the front and rear end faces thereof, and is fixedly disposed in the casing, the front end is opposite to the center electrode, the rear end is located at the open end of the casing, and the outer wall and the outer casing are The inner wall fits. The grounding electrode is disposed on the inner wall of the casing, or is disposed around the fire-breathing hole at the front end of the flow guiding insert, and forms an ignition end portion having a gap of spark discharge with the end portion of the center electrode.

Further, the flow guiding insert further includes a flow guiding hole extending through the front and rear ends thereof, the flow guiding hole is distributed around the fire detecting hole; or the side wall of the flow guiding insert is provided with a guiding groove in the axial direction, the guiding flow The groove forms a flow guiding hole with the inner wall of the housing.

Further, the flow guiding insert further includes an air inlet hole disposed on the flow guiding groove and penetrating the fire detecting hole.

Further, a drainage groove perpendicular to the fire injection hole and penetrating the plurality of flow guiding grooves is further included on the side wall of the flow guiding insert.

Further, the fire-breathing hole of the flow guiding insert has a diameter at the front end larger than the diameter of the rear end, the diameter of the guiding hole is smaller than the diameter of the rear end of the guiding hole; or the hole of the fire-emitting hole of the guiding insert is smaller than the diameter of the front end The aperture of the end of the orifice is located at the front end with an aperture larger than the aperture at the rear end.

Further, the fire hole opening at the rear end of the flow guiding insert protrudes from the open end of the casing and has a flare shape, and the opening of the rear end opening of the fire extinguishing hole is larger than the diameter of the middle portion of the fire extinguishing hole and smaller than the shell The aperture at the open end of the body.

Further, a fire hole opening located at a front end of the flow guiding insert protrudes from a front end surface of the flow guiding insert, and an ignition end portion having a gap of a spark discharge is formed between the center electrode and the front end opening of the fire extinguishing hole.

Alternatively, a firing hole opening at the front end of the flow guiding insert is recessed in the front end surface of the flow guiding insert to form an ignition port, and an ignition end having a gap of a spark discharge is formed between the center electrode and the inner wall of the ignition opening. .

Further, the flow guiding hole of the flow guiding insert spirally surrounds the fire extinguishing hole.

Further, the front end of the flow guiding insert is fixed in the housing by welding; or the flow guiding insert is located in the housing, and the open end of the housing is formed by punching to form a narrow end of the curved surface to fix the flow guiding insert.

Compared with the prior art, the spark plug of the present invention utilizes fuel more fully, and improves fuel utilization. The structure of the flow guiding insert can improve the ignition efficiency and the reflux efficiency of the spark plug, thereby improving the combustion efficiency of the internal combustion engine.

The spark plug of the present invention will be described in detail below with reference to the accompanying drawings.

DRAWINGS

1 is a schematic structural view of a spark plug in the prior art.

2 is a schematic structural view of another spark plug in the prior art.

Fig. 3 is a schematic view showing the structure of a first embodiment of a spark plug of the present invention.

4 is a perspective perspective structural view of the flow guiding insert shown in FIG. 3.

Fig. 5 is a schematic view showing the structure of a second embodiment of the spark plug of the present invention.

Fig. 6 is a schematic structural view of a flow guiding insert of a second embodiment of the present invention.

Fig. 7 is a schematic structural view of a flow guiding insert of a third embodiment of the present invention.

Fig. 8 is a perspective perspective structural view showing a flow guiding insert of a fourth embodiment of the present invention.

Fig. 9 is a schematic structural view of a flow guiding insert of a fifth embodiment of the present invention.

Figure 10 is a schematic view showing the structure of a flow guiding insert of Embodiment 6 of the present invention.

detailed description

Example 1

Please also refer to FIG. 3, which is a schematic structural view of Embodiment 1 of the spark plug of the present invention. The spark plug 20 includes a center electrode 21, an insulator 24, a housing 26, and a flow guide insert 28. The insulator 24 is a ceramic insulator having a shaft hole extending in the axial direction. The center electrode 21 is inserted through a shaft hole penetrating the insulator 24 and exposes the end portion 211. The housing 26 has a hollow structure and is sleeved on the surface of the insulator 24. The flow guiding insert 28 is fixedly disposed in the hollow casing 26, the front end of which is opposite to the center electrode 21, the rear end of which is located at the open end of the casing 26, and the outer wall of which is fitted to the inner wall of the casing 26.

Please also refer to FIG. 4 , which is a perspective perspective structural view of the flow guiding insert shown in FIG. 3 . The flow guiding insert 28 is a columnar body, wherein the shaft is provided with a fire hole 282 extending through the front and rear end faces of the flow guiding insert 28, and a flow guiding hole 283 penetrating the front and rear end faces of the flow guiding insert 28 is disposed around the fire detecting hole 282. . The flow guiding hole 283 communicates with the fire injection hole 282 through the inner cavity of the housing at the front end of the flow guiding insert 28. The end portion 211 of the center electrode 21 extends into the fire hole 282 of the flow guiding portion 28, and the inner wall of the fire hole 282 serves as the ground electrode 22, and forms an ignition end portion having a gap of spark discharge with the center electrode 21. The outer surfaces of the center electrode 21 and the ground electrode 22 are plated with a layer of a precious metal such as sheet metal to improve the ignition performance. The guide insert 28 can be fixed in the housing 26 in two ways, one of which is that the front end of the flow guide insert 28 is fixed to the housing 26 by welding; the second is: first insert the flow guide insert Inside the housing, the open end of the housing is stamped to form a narrow end of the arcuate surface to secure the flow guide insert 28.

As a further improvement of the embodiment, a recess or a rib (not shown) is provided at a joint portion of the fire exit hole 282 and the flow guide hole 283 on the front end surface and/or the rear end surface of the flow guide insert to further guide The direction of flow of fuel and mixed gases.

At the intake stroke of the internal combustion engine, the mixed gas formed by the fuel and the air simultaneously fills the cylinder of the combustion chamber. Since the pressure in the cylinder is much larger than the pressure at the ignition end of the spark plug, the mixed gas passes through the flow guiding hole 283 of the flow guiding insert 28. The fire vent 282 is rapidly advanced to the spark plug and fills the periphery of the ignition end.

When the spark plug is ignited, the ignition end of the spark plug is filled with a mixed gas, and the mixed gas around the ignition electrode is discharged between the center electrode 21 and the ground electrode 22, and the fire gas is inside the fire hole. The gas is ignited and rapidly expanded, and the pressure is rapidly increased, which in turn pushes the spark to the cylinder.

When the spark ignition of the pulse ignition occurs, the pressure at the ignition end is rapidly reduced. At this time, the flow guiding hole acts as a return passage to accelerate the return of the mixed gas in the cylinder. During ignition, the cylinder fuel is rapidly accumulated in the ignition end, and the ignited gas sparks quickly reach the cylinder during the fire, thereby realizing the accelerated return of the gas in the spark plug chamber and the cylinder of the combustion chamber, thereby improving the internal combustion engine. Combustion efficiency.

Compared with the prior art, the center electrode 21 of the spark plug of the present invention is protected by the flow guiding insert, thereby avoiding the occurrence of deposits and causing corrosion thereof, thereby improving the service life thereof. Secondly, in the conventional process, a plurality of baffles are required to be welded in the casing to form the diversion holes and the fire-breathing holes, and the process is complicated and difficult to implement, and the cost is also high. The flow guiding insert of the present invention and the casing of the spark plug are respectively processed by the processing method of being separately assembled and fixed, which is easy to realize, and can improve the production efficiency of the spark plug. Further, the structure of the flow guiding insert can improve the ignition efficiency and the reflux efficiency of the spark plug, thereby improving the combustion efficiency of the internal combustion engine.

Example 2

The spark plug of the second embodiment is substantially the same as that of the first embodiment except that the structure of the flow guiding insert of the spark plug is different. Please refer to FIG. 5 and FIG. 6 at the same time, wherein FIG. 5 is a schematic structural view of Embodiment 2 of the spark plug of the present invention. FIG. 6 is a schematic structural view of the flow guiding insert 38 of the second embodiment. The flow guide insert 38 is a columnar body having a fire injection hole 382 and a flow guiding groove 383. The fire hole 382 is circular and located at the central axis of the flow guiding portion 38 and penetrates the front and rear end faces of the flow guiding portion 38. The guide groove 383 is located on the side wall of the flow guiding portion 38. The guide groove 383 is formed by a washing and cutting process, and can be formed into a shape of a triangle, a polygon, an arc, or the like in cross section. Moreover, since the flow guiding insert is an independent processing component, the inner diameter of the flow guiding groove can be easily enlarged. Since the outer wall of the flow guiding insert 38 is fitted to the inner wall of the casing, the guiding groove 383 forms a flow guiding hole with the inner wall of the casing. The orifice is as large as possible in order to increase the space for the blasting flow. Further, an intake hole 384 penetrating the fire hole 382 is further provided in the flow guiding groove 383. The air inlet hole 384 can be perpendicular to the fire exit hole 382 or form an angle with the fire exit hole 382. The end portion 211 of the center electrode 21 extends into the fire hole 282 of the flow guiding portion 28, and the inner wall of the fire hole 282 serves as the ground electrode 22, and forms an ignition end portion having a gap of spark discharge with the center electrode 21.

When the spark plug is ignited, the ignited gas is directly released through the blast hole 382 toward the cylinder. Further, the air inlet hole 384 can also accelerate the backflow of the mixed gas in the cylinder. The direction of gas recirculation is substantially perpendicular to the side wall of the flow guide insert 38, so that the area near the inlet aperture 384 is the intersection of the lateral flow and the longitudinal flow, which is where the amount of gas flow is greatest. Therefore, as a preferred mode of the embodiment, the end of the center electrode is disposed at the intake hole 384. In the vicinity, in the place where the gas flow is the largest and the fastest, the position of the ignition end can realize the rapid accumulation of the cylinder fuel at the ignition end during ignition, and the ignition of the ignited gas can quickly reach the cylinder during the fire, and the gas is realized. Accelerated backflow in the body of the spark plug chamber and in the cylinder of the combustion chamber, thereby improving the combustion efficiency of the internal combustion engine. Thereby, the speed of gas backflow is further increased to improve the combustion efficiency of the internal combustion engine.

Example 3

The spark plug of the third embodiment is substantially the same as that of the first embodiment except that the structure of the flow guiding insert of the spark plug is different. Please refer to FIG. 7 , which is a schematic structural diagram of the flow guiding insert 48 of the third embodiment. The flow guiding insert 48 is a columnar body, wherein the shaft is provided with a fire hole 482 extending through the front and rear end faces of the flow guiding insert 48, and a flow guiding hole 483 penetrating the front and rear end faces of the flow guiding insert 48 is disposed around the fire detecting hole 482. . The flow guiding hole 483 communicates with the fire injection hole 482 through the inner cavity of the housing at the front end of the flow guiding insert 48. In this embodiment, the fire injection hole of the flow guiding insert has a diameter at the rear end that is larger than the front end of the hole, and the opening of the fire injection hole at the rear end has a flare shape, and the diameter of the flow guiding hole at the rear end is smaller than the front end thereof. The aperture. The port at the tip end of the fire exit hole of the flow guide insert 48 serves as a ground electrode, and forms an ignition end portion having a gap of a spark discharge with the center electrode.

As a modified embodiment of the embodiment, the fire-breathing hole of the flow guiding insert has a diameter at the front end larger than the diameter of the rear end thereof, and the opening of the fire-blasting hole at the front end has a flare shape, and at the same time, the diameter of the guiding hole is located at the front end. Less than the aperture at the back end. The end of the center electrode extends into the front end of the fire blasting hole of the flow guiding insert, and the inner wall of the fire blasting hole serves as a grounding electrode, and forms an ignition end portion having a gap of spark discharge with the center electrode.

Since the fire blast hole is mainly used as a igniting passage for the spark at the time of ignition, the flow guiding hole is a return flow passage as a mixed gas. Therefore, the ratio of the front and rear end apertures of the blast hole in this embodiment is opposite to the ratio of the front and rear end apertures of the flow guiding hole. In the ignition process of the spark plug, the direction of the airflow can be further guided to accelerate the efficiency of the gas return, thereby further improving the ignition efficiency of the spark plug.

Example 4

The spark plug of the fourth embodiment is substantially the same as that of the first embodiment except that the structure of the flow guiding insert of the spark plug is different. Please refer to FIG. 8 , which is a schematic perspective structural view of the flow guiding insert 58 of the fourth embodiment. The flow guiding insert 58 is a columnar body, wherein the shaft is provided with a fire hole 582 penetrating the front and rear end faces of the flow guiding insert 58, and a flow guiding hole 583 penetrating the front and rear end faces of the flow guiding insert 58 is disposed around the fire detecting hole 582. . The flow guiding hole 583 communicates with the fire injection hole 582 through the inner cavity of the housing at the front end of the flow guiding insert 58. In the present embodiment, the opening of the fire-breathing hole 582 at the rear end of the flow guiding insert 58 protrudes from the open end of the housing and has a flared shape. The opening of the rear end of the fire-emitting hole 582 has a larger diameter than the fire-emitting hole 582. The aperture of the middle section is smaller than the aperture of the open end of the housing. The opening of the fire hole 582 located at the front end of the flow guiding insert 58 is recessed in the guide The front end face of the piece forms an ignition port. An ignition end having a gap of a spark discharge is formed between the center electrode and the inner wall of the ignition port.

In the embodiment, the structure of the fire blast hole can further improve the discharge speed of the spark when the spark plug is ignited, and the ignition efficiency of the spark plug can be further improved.

Example 5

The spark plug of the fifth embodiment is substantially the same as that of the first embodiment except that the structure of the flow guiding insert of the spark plug is different. Please refer to FIG. 9 , which is a schematic structural diagram of the flow guiding insert 68 of the embodiment 5. The flow guiding insert 68 is a columnar body, wherein the shaft is provided with a fire hole 682 extending through the front and rear end faces of the flow guiding insert 68, and a flow guiding hole 683 extending through the front and rear end faces of the flow guiding insert 68 is disposed around the fire detecting hole 682. . The flow guiding hole 683 communicates with the fire injection hole 682 through the inner cavity of the housing at the front end of the flow guiding insert 28. Further, the flow guiding hole 683 of the flow guiding insert and the fire detecting hole 682 are non-parallel, but the guiding hole 683 spirally surrounds the fire detecting hole 682. A fire hole opening at a front end of the flow guide insert protrudes from a front end surface of the flow guide insert, and an ignition end portion having a gap of a spark discharge is formed between the center electrode and the front end opening of the fire exit hole.

The structure of the flow guiding hole 683 can form a vortex reflow, and the reflux speed of the mixed gas can be further increased to further improve the ignition efficiency of the spark plug.

Example 6

The spark plug of the sixth embodiment is substantially the same as that of the first embodiment except that the structure of the flow guiding insert of the spark plug is different. Please refer to FIG. 10 , which is a schematic structural diagram of the flow guiding insert 38 of the embodiment 6. The flow guiding insert 78 is a columnar body on which a fire injection hole 782 and a flow guiding groove 783 are disposed. The fire hole 782 is circular and located at the central axis of the flow guiding portion 78 and penetrates the front and rear end faces of the flow guiding portion 78. The guide groove 783 is located on the side wall of the flow guiding portion 78 and penetrates the front and rear end faces of the flow guiding portion 78. Further, a drainage groove 784 extending through the plurality of flow guiding grooves 783 is further included on the side wall of the flow guiding insert 78. The drain groove 784 can be perpendicular to the fire exit hole, or the drain groove 784 surrounds the flow guide groove 783 and forms an angle with the fire injection hole. During the processing, the guide groove 783 is first formed by the washing and cutting process, and then the horizontally and horizontally cuts are formed to form the drainage groove 784 centering on the fire injection hole. Since the outer wall of the flow guiding insert 78 is in contact with the inner wall of the casing, the guiding groove 783 forms a flow guiding hole with the inner wall of the casing, and the drainage groove 784 forms a drainage hole with the inner wall of the casing. The center electrode of the spark plug extends into the fire blasting hole, and the grounding electrode is located on the inner wall of the flow guiding insert in the fire blasting hole and is perpendicular to the center electrode to form an ignition end portion having a gap of spark discharge. The firing end can be located at the front end, or the middle, or the rear end of the flow guide insert. The drainage groove 784 is one or more. In the present embodiment, the flow guiding grooves are connected by the drainage grooves to form a large flow guiding space to increase the explosive force when the spark plug is ignited, thereby further improving the ignition efficiency.

In addition, the spark plug of the present invention may also have various modified embodiments, specifically the flow guiding inserts in the above embodiments. The structure of the fire hole, the diversion hole, the drainage hole, the air inlet hole, and the ground electrode may be used in any combination; at the end face of the flow guiding insert, the fire hole and the diversion hole or the guide groove form a fan A lobed or spiral structure; and an inner wall of the front end or the rear end of the fire vent and/or the flow hole is provided with a threaded rib or pocket to further guide the flow of the mixed gas.

The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are possible without departing from the spirit and scope of the invention. Intended to include these changes and modifications.

Claims

a spark plug, characterized in that it comprises

- an insulator having a shaft hole extending in the axial direction;

a central electrode inserted through the shaft hole of the insulator and exposing the end portion;

- a housing, which is in the form of a hollow cylinder, the housing being sleeved on the surface of the insulator;

—— a flow guiding insert, which is a columnar body, has a fire-breathing hole penetrating through the front and rear end faces thereof, and the flow guiding insert is fixedly disposed in the casing, the front end of which is opposite to the center electrode, and the rear end thereof is located at the opening of the casing The outer wall of the end is attached to the inner wall of the casing;

- a grounding electrode provided on the inner wall of the casing or at the periphery of the fire blasting hole provided at the front end of the flow guiding insert, and an ignition end portion having a gap of spark discharge formed between the end portion of the center electrode.
The spark plug according to claim 1, wherein the flow guiding insert further comprises a flow guiding hole extending through the front and rear ends thereof, the flow guiding hole is distributed around the fire detecting hole; or the side wall of the flow guiding insert is on the shaft A flow guiding groove is formed upward, and the flow guiding groove forms a flow guiding hole with the inner wall of the casing.
The spark plug according to claim 2, wherein the flow guiding insert further comprises an air inlet hole disposed on the flow guiding groove and penetrating the fire detecting hole.
The spark plug according to claim 2, further comprising a drainage groove extending through the plurality of flow guiding grooves on the side wall of the flow guiding insert.
The spark plug according to claim 2, wherein the fire injection hole of the flow guiding insert has an aperture at a front end that is larger than an aperture at a rear end thereof, and the aperture of the flow guiding hole at the front end is smaller than an aperture at a rear end thereof; or the flow guiding insert The fire hole is located at the front end with a smaller aperture than the rear end, and the flow hole is located at the front end with a larger aperture than the rear end.
The spark plug according to claim 2, wherein the fire hole opening at the rear end of the flow guiding insert protrudes from the open end of the housing and has a flare shape, and the aperture of the rear end opening of the fire exit hole is larger than the The aperture of the middle portion of the fire hole is smaller than the aperture of the open end of the housing.
The spark plug according to claim 6, wherein a fire hole opening at a front end of the flow guiding insert protrudes from a front end surface of the flow guiding insert, and a spark discharge is formed between the center electrode and the front end opening of the fire extinguishing hole. The ignition end of the gap.
The spark plug according to claim 6, wherein the fire hole opening at the front end of the flow guiding insert is recessed in the front end surface of the flow guiding insert to form an ignition port, and the center electrode and the inner wall of the ignition port Formed with fire The ignition end of the gap in the flower discharge.
A spark plug according to any one of claims 2-8, wherein the flow guiding hole of the flow guiding insert spirally surrounds the fire blasting hole.
The spark plug according to claim 9, wherein the front end of the flow guiding insert is fixed in the housing by welding; or the flow guiding insert is located in the housing, and the open end of the housing is formed by punching to form a narrow end of the curved surface To fix the flow guide insert.