TWI431880B - Symmetrical dipole strong electric field discharge spark plug - Google Patents

Description

Symmetric dipole strong electric field discharge type spark plug

The invention relates to a symmetric dipole strong electric field discharge type spark plug, in particular to a corresponding point end center electrode and a ground electrode end of a spark plug ignition electrode, which has a corresponding discharge blade end structure, by reducing the discharge end of the electrode The effective cross-sectional area increases the charge density at the front end of the discharge blade to quickly establish the ignition electric field strength, thereby achieving the technology of improving combustion efficiency and saving fuel.

According to the known spark plug structure, it is applied in the ignition system of a vehicle or an internal combustion engine, which mainly uses a first discharge action surface of the center electrode to discharge a high voltage electrode provided by the ignition coil to a second discharge of the electrode ground. The active surface is subjected to high voltage discharge, thereby generating an ignition arc effect and achieving the purpose of the engine blasting operation. It is known from the above that the ignition efficiency of the Mars plug and the accuracy of the spark plug ignition will be related to the engine efficiency and performance.

In view of this, all relevant manufacturers have made every effort to innovate and improve the discharge structure of the Mars plug. There is a patent pre-existing case that can generate multiple spark ignitions, such as the Republic of China new patent No. 71490, "New majority of sparking spark plugs" and No. 233853 "Multi-sparking spark plugs", which are set at the center of the upper and lower insulators. The electrode is provided with two central positive electrode rods on the upper insulator, and the high-voltage electric induction causes the gap between the central positive electrode rods, and the outermost positive electrode rod and the ground electrode gap to simultaneously perform two or more spark ignitions. Although the conventional structure has more than two functions of spark ignition structure, it is extended by the center electrode to transfer the electric charge to the central positive electrode in the parallel position, and then discharges the ground electrode, because the electric charge is only attracted by the higher electric field. The higher the electric field is capable of attracting electric charge, the patent is only to translate the ignition point to the electrode on one side, and it is impossible to achieve the expected effect of the second ignition discharge, so that the second ignition discharge is inferior. . Furthermore, although the conventional structure of "multi-sparking spark plug" has more than two spark ignition structure functions, since the electric charge is only attracted by the higher electric field, the higher electric field attracts the electric charge faster, so the patent can only Since the center electrode is discharged and the multi-spark ignition cannot be generated by the insertion electrode, and the expected effect of the second ignition discharge cannot be achieved, the conventional structure is necessary for further improvement.

There is another patent for the Mars plug that can achieve secondary ignition, such as the Republic of China new patent No. 372113 "Interpenetrating (interactive) double spark fire spark plug", which is opened at the radius of the center electrode end face to make a circular groove The end faces of the center electrode form two different sizes of firing faces. The conventional structure utilizes the tip discharge effect by first raising the discharge electric field using the corner portion of the center electrode edge with a smaller effective sectional area, and then generating an ignition discharge to the relatively large electrode region, although the front corner region of the center electrode can be used to lift the discharge first. The electric field; however, it only has a single pole, so it can only slightly increase the discharge electric field. Although it has an ignition effect, it cannot concentrate the arc density. Therefore, it is less able to increase the combustion efficiency of the engine and achieve the purpose of complete combustion of the mixed oil vapor. Therefore, the conventional structure still needs to be improved.

Furthermore, there is another patent premise that can produce an arc discharge effect, such as the Republic of China new patent publication No. 225355 "Circular-type fire-fighting spark plug" and the new patent publication No. M351542 "Mars plug", which is related to the above Mars. The biggest difference between the plugs is that the grounding electrode is arranged in a ring shape, and the outer peripheral surface of the center electrode is used as a discharge action region to perform high-voltage discharge on the inner peripheral surface region of the annular ground electrode. Although the conventional structure can generate the effect of arc discharge, the ignition area is increased to improve the ignition efficiency. However, after the ignition point area is increased, the electric field density is inevitably lowered, the ignition point arc is not easily concentrated, and the time of flashover is delayed, which is liable to cause ignition failure. And the untimely effect, which in turn affects the ignition efficiency of the Mars plug, so the conventional structure still needs to be improved.

In addition, there are patents for multi-burning spark plugs, such as China ZL200920058086.8, ZL200920058085.3, ZL200520068930.7, ZL03249134.4, ZL02239946.1, ZL02200024.0, ZL94218163.8 and ZL02121285.6 The previous case. However, in the prior patents, the center electrode or the ground electrode is designed to be multi-point ignition, which is not designed as a corresponding blade electrode structure of the present invention. Obviously, although the patented technology of the previous case has the function of multi-point ignition structure, it still cannot effectively and effectively enhance the critical electric field of ignition, and the ignition efficiency must be enhanced by increasing the voltage. Moreover, the charge density cannot be enhanced. The ignition arc cannot be concentrated, but it not only consumes energy, but also has a long ignition time and a too weak ignition arc during fast operation, resulting in inaccurate ignition efficiency and lack of fuel consumption. Moreover, if the electrode is designed to have a pin point structure and cannot withstand high voltage discharge, it is easily damaged and the discharge gap is increased, which cannot be used, and the durability is greatly reduced.

There is a prior art patent for reducing the cross-sectional area of the electrode, such as the US Patent No. 5,461,210, US Pat. No. 5,461,276, and US Pat. No. 7,589,460, which have the function of enhancing the critical electric field because of the reduction of the electrode cross section. The end is retracted to the center and is pin-pointed. As in the case described in the previous paragraph, when the high-voltage discharge is long-term, it is easily damaged and the discharge gap is increased, resulting in poor ignition voltage and unusable ignition, which greatly reduces the durability.

In view of the above-mentioned patents and the existing conventional Mars plug structure, the inventors have actively invested in research due to the poor design of the electrode structure, and have been actively researching and testing, and experimental analysis. There are finally the technical achievements of the present invention.

It is an object of the present invention to provide a spark plug which enhances the ignition charge density and rapidly establishes an effective electric field strength, improves combustion efficiency, reduces exhaust pollution, and saves fuel. The technical means for achieving the foregoing effects includes a center electrode and a grounding electrode, wherein the first discharge action surface of the center electrode and the second discharge action surface of the ground electrode are respectively provided with the same number of first discharge protrusions and The second discharge convex portion, the first discharge convex portion and the second discharge convex portion respectively have a blade shape, and correspond to each other one by one, and the effective sectional area thereof is respectively placed along the first The first active edge and the second discharge surface are gradually reduced toward the opposite ends of the second discharge surface, and a first blade edge extending in a straight line is formed at the ends of the first discharge protrusion and the second discharge protrusion, respectively. The second blade edge, the first blade edge and the second blade edge are opposite one another, so that the center electrode and the ground electrode have a corresponding discharge blade edge structure to reduce the effective sectional area of the electrode end, and increase the charge density of the discharge blade edge and The above purpose can be achieved by establishing an electric field strength.

Another object of the present invention is to provide a spark plug that can more quickly enhance the intensity of the ignition electric field, improve combustion efficiency, and save fuel. The technical means for achieving the aforementioned effects is to design the discharge blade edge structure of the center electrode and the ground electrode to be mutually symmetrical structural forms, that is, the first discharge convex portion and the second discharge convex portion, both from the root portion to the end portion. The shape is symmetrical with respect to one of the normal directions, and the vertical plane is a symmetrical reference plane, and the above object can be achieved.

Another object of the present invention is to provide an ignition electric field strength that not only rapidly enhances the effective, but also can effectively increase the ignition arc concentration at the active end to improve combustion efficiency and fuel economy, and the auxiliary side of the blade is symmetrical to ensure effective ignition. distance. The technical means for achieving the foregoing effects is that the electrode is designed as a blade edge structure, that is, the first discharge convex portion and the second discharge convex portion are respectively plural, and are respectively equidistantly distributed on the first discharge action surface and the first The above object can be achieved by the second discharge action surface.

壹. Technical features of the present invention

Referring to Figures 1-3, the Mars plug of the present invention is used in a vehicle (e.g., a locomotive or a car) or an ignition system of an internal combustion engine. The basic structure of the spark plug of the present invention includes a Mars plug body 10, a center electrode 20, and a ground electrode 30. The body 10 is made of a material having an insulating effect to meet the requirements of insulation and high temperature resistance. The center electrode 20 is electrically connected to the ignition control circuit for receiving high voltage electricity generated from the ignition coil, and the opposite ground electrode 30 generates a high voltage discharge for ignition. The ground electrode 30 is coupled to a metal ring body 34 having a threaded surface 340. The threaded surface 340 is screwed to the engine casing to allow the ground electrode 30 to be in a grounded configuration.

One of the features of the present invention is that the center electrode 20 and the ground electrode 30 are designed to correspond to a blade-like discharge tip structure, so as to reduce the effective cross-sectional area of the working end of the two electrodes, rapidly enhance the ignition electric field strength, and thereby improve the combustion efficiency. In order to save fuel.

Another feature of the present invention is that the blade-shaped discharge tip structures of the center electrode 20 and the ground electrode 30 are designed to be symmetric with each other, which can further increase the charge density, concentrate the ignition arc, and improve the combustion efficiency. Save fuel.

Another feature of the present invention is that not only the ignition field strength is rapidly enhanced by the plurality of blade-like tip structures on the electrodes, but also the ignition charge density is actually increased to improve combustion efficiency and fuel economy, and a plurality of blade-like tips The structure assists each other to ensure the effectiveness of the ignition and to reduce the ignition electrode point from being lost due to carbon short circuit.

According to another feature of the present invention, the first discharge convex portion 22 and the second discharge convex portion 32 respectively have a blade-like discharge structure, and the first blade edge 220 and the second blade edge 320 extend along a straight line and are partially used for a long time. Depletion, the effective tip discharge ignition separation distance between the first blade edge 220 and the second blade edge 320 has not changed (in the general specification, the effective discharge ignition interval distance is 4mm, 6mm and 8mm), which greatly increases the service life.

贰. The first specific embodiment of the present invention

As shown in FIG. 1-3, in a first embodiment of the present invention, the first discharge action surface 21 is located at the top of the center electrode 20, and the second discharge action surface 31 of the ground electrode 30 is located above the top of the center electrode 20. The first discharge action surface 21 of the center electrode 20 and the second discharge action surface 31 of the ground electrode 30 are respectively provided with the same number of first discharge convex portions 22 and second discharge convex portions 32, and the first discharge convex portion 22 and the second discharge convex portion 32 respectively have a blade-like tip structure, and are oriented one by one, and the thickness thereof is along the first discharge action surface 21 and the second discharge, respectively. One of the first surface of the first discharge protrusion 22 and the second discharge protrusion 32 is formed with a thickness that is minimized and extends parallel to the straight line by a specific length. The first blade edge 220 and the second blade edge 320, the first blade edge 220 and the second blade edge 320 are parallel to each other, and each of the first blade edge 220 and the second blade edge 320 itself extends longer than the thickness, and each The first blade edge 220 and the second blade edge 320 have a maximum thickness of less than 0.6 mm (preferably less than 0.2 mm), and a cross section extending from the first blade edge 220 and the second blade edge 320 to the length direction It is observed that the cross-sectional profiles of the first discharge convex portion 22 and the second discharge convex portion 32 are respectively V-shaped. In this embodiment, the shapes of the first discharge convex portion 22 and the second discharge convex portion 32 are symmetric with respect to one of the normal planes of the normal line, and the first blade edge 220 and the second blade edge 320 are respectively respectively Parallel to the vertical plane and equidistant. Furthermore, in this embodiment, the corresponding first blade edge 220 and the second blade edge 320 extend in parallel parallel to the straight line, and the straight line is at the normal of the first discharge action surface 21 and the second discharge action surface 31. On the vertical plane, the first blade edge 220 and the second blade edge 320 are respectively positioned on a contour plane.

The first discharge convex portion 22 and the second discharge convex portion 32 respectively shape the center electrode 20 and the ground electrode 30 by a cutting processing technique, so that the first discharge convex portion 22 and the second discharge convex portion 32 respectively and the center The electrode 20 and the ground electrode 30 are made of the same material and integrally formed.

Reference to the second specific embodiment of the present invention

As shown in FIG. 4-6, in a second embodiment of the present invention, three first discharge action surfaces 21 are circumferentially distributed on the circumferential surface of the center electrode 20, and the second discharge action surface 31 of the ground electrode 30 has three. And the first discharge action surface 21 facing the circumferential surface of the center electrode 20 one by one. A first discharge convex portion 22 and a second discharge convex portion 32 are respectively disposed on the first discharge action surface 21 of the center electrode 20 and the second discharge action surface 31 of the ground electrode 30, and the first discharge convex portion 22 and the second portion The discharge convex portions 32 are opposite to each other, and the thickness thereof is gradually reduced toward the end along the normal direction of one of the first discharge action surface 21 and the second discharge action surface 31, respectively, and is respectively formed into a blade edge. a tip end structure, and a first blade edge 220 and a second blade edge 320 having a thickness reduced to a minimum and extending parallel to the straight line L by a specific length are respectively formed at ends of the first discharge protrusion 22 and the second discharge protrusion 32 The first blade edge 220 and the second blade edge 320 are parallel to each other, and each of the first blade edge 220 and the second blade edge 320 itself extends longer than the thickness, and each of the first blade edge 220 and each second The maximum thickness of the blade edge 320 is less than 0.6 mm, respectively. If viewed from a cross section perpendicular to the length direction of the first blade edge 220 and the second blade edge 320, the first discharge protrusion 22 and the second discharge protrusion 32 The cross-sectional profiles are each in a V shape. In this embodiment, the shapes of the first discharge convex portion 22 and the second discharge convex portion 32 are symmetric with respect to one of the normal planes of the normal line, and the first blade edge 220 and the second blade edge 320 are respectively respectively Parallel to the vertical plane and equidistant. Furthermore, in this embodiment, the corresponding first blade edge 220 and the second blade edge 320 extend parallel to the straight line L, and the straight line L is at the normal of the first discharge action surface 21 and the second discharge action surface 31. On a vertical plane P, the first blade edge 220 and the second blade edge 320 are respectively positioned on a contour plane.

The first discharge convex portion 22 and the second discharge convex portion 32 respectively shape the center electrode 20 and the ground electrode 30 by a cutting process, so that the first discharge convex portion 22 and the second discharge convex portion 32 are respectively connected to the center electrode 20 And the grounding electrode 30 is made of the same material and integrally formed.

肆‧Experiment of the invention

A wide variety of substances can be electrically conductive, depending on the energy level of the valence electrons in the orbital orbital of the substance. The nucleus has high binding force to the valence electrons of the outer orbital conductor, and the conductivity of the material is poor, and the impedance performance is also poor. Higher. The nucleus has a low binding force to the valence electrons of the peripheral orbital conduction band, and the conductivity of the substance is better and the impedance is also small. The metal material is a good conductor because at normal temperature, its peripheral orbital conduction valence electrons are hardly bound by the nucleus and become free electrons, so it can be a good conductor. The phenomenon of discharge in the air is to establish a strong electric field due to the high voltage. When the electric field strength reaches the critical electric field of the air conduction, the atomic peripheral orbital of the air conducts the valence electrons from the nucleus. Electricity, commonly known as corona discharge. In addition, the tip discharge means that the metal tip is concentrated by a large amount of electric charge, the surface area of the metal tip is small, and the charge density is high to establish a large electric field. When the electric field strength of the metal tip is increased, it is easier to guide the dissimilar charge to form a combination. Discharge phenomenon; the lightning rod is the purpose of using this metal tip principle to guide the charge flow through the lightning rod conductor without flowing through nearby buildings to protect the building.

From the above inference, the ignition of the general Mars plug is also the principle of using the end point discharge. The ignition signal is sent from the ignition timing angle. After the signal is amplified by the electronic amplifier, the high-voltage ignition coil is driven to output a high voltage to the spark plug. The charge flows through the center conductor of the spark plug to establish a potential drop at the end of the center electrode conductor, and then flows to the ignition electrode to establish an electric field. When the electric field at both ends of the ignition electrode reaches the conductive critical electric field of the mixed oil and gas compressed in the engine cylinder, the ignition electrode At the same time, an ignition electrode potential drop is established at both ends. At this time, the electric charge is electrically exchanged through the mixed oil and gas compressed in the engine cylinder to generate an electric arc, and the mixed mixed oil and gas in the engine cylinder is ignited to cause explosive combustion. Therefore, the total voltage drop at the end of the overall Mars plug is the potential drop of the center electrode conductor plus the potential drop of the ignition electrode. The concentration and immediacy of the ignition arc have a great influence on the efficiency of the engine. When the mixed oil and gas ignition arc sparks in the cylinder are concentrated, the ignition efficiency is higher. When the ignition electric field is established, the mixed oil and gas is compressed into the engine cylinder. Conductive critical electric field, the better the ignition accuracy.

Generally, the ignition electrode end point of the conventional Mars plug is too large, and the charge density is low because of the corresponding end surface area of the ignition electrode. It is difficult to establish a critical conductive electric field of the mixed oil and gas that is compressed in the engine cylinder, and usually requires a large high-voltage ignition coil voltage. To establish a critical conductive electric field that causes the ignition arc, but the high voltage of the high-voltage ignition coil also increases the interference effect of EMI. Furthermore, the surface area of the corresponding ignition electrode of the spark plug is too large, and the ignition arc is less concentrated and lower. The ignition arc benefits and the high voltage ignition coil voltage is high, and it takes more time to accumulate charge to establish an electric field, which is easy to cause ignition delay and reduce engine efficiency.

The invention uses the electric field Gauss' law to reduce the effective cross-sectional area at the opposite ends of the spark plug ignition electrode, thereby increasing the charge density and accelerating the establishment of the critical conductive electric field of the mixed oil and gas compressed in the engine cylinder. The charge density is increased, and the electric field strength is established, so that the corresponding end points of the spark plug ignition electrode can easily reach the conductive critical electric field of the mixed oil and gas, and an ignition arc is generated; and the arc is concentrated by the blade-like end ignition structure. Increasing the immediacy and accuracy of the ignition speed, and improving the combustion efficiency of the mixed oil and gas in the engine cylinder, reducing engine exhaust pollution and saving fuel.

The basic circuit principle of spark plug ignition is shown in Figure 7. The ignition principle is that when Mars is plugged with current I , it will generate charge flow at the center electrode. The relationship between current and passing charge and time is as shown in formula (1). And (2): I = △ q / △ t (1)

△ q = I △ t (2)

Where Δ q is the total static charge of the high-voltage coil passing through the spark plug electrode each time; Δ t is the time during which the high-voltage coil ignites and the charge flows through the spark plug electrode.

Furthermore, it is known by using Gauss' law (3), (4) and (5); the electric field is fixed under the condition of total static charge The effective cross-sectional area of the end corresponding to the size of the ignition electrode In inverse proportion, that is, the smaller the effective cross-sectional area, the higher the charge density, the faster the conductive critical electric field of the mixed oil and gas is established, and the smaller the effective cross-sectional area of the corresponding end of the ignition electrode, the stronger the arc spark is concentrated.

ε = kε _o (5)

Where ε _o is the permittivity of free space; ε is the dielectric constant of the mixed oil and gas; k is the dielectric constant of the mixed oil and gas; where k = ε / ε _o ; Φ is the electric field Electric flux The electric field between the ends of the two corresponding ignition electrodes; Is the effective cross-sectional area of the electrode.

The following two equations (6) of the ignition critical potential V _T between the ends of the corresponding ignition electrodes are utilized. When the electric field When establishing quickly, the distance between the two ignition electrodes Under the constant condition, the ignition critical potential V _T between the two corresponding ignition electrode terminals is also reached faster, and according to the above formulas (1) to (5), it can be known that the current flowing through the spark plug I And the distance between the two opposite ignition electrodes The effective cross-sectional area of the end of the ignition electrode under constant conditions When shrinking, the electric field strength increases, and the electric field energy density u _E is increased by the formula (7), and the ignition arc is enhanced.

Where u _E is the electric field energy density between the endpoints of the two corresponding ignition electrodes. The distance between the ends of the two corresponding ignition electrodes. V _T is the critical potential at which the ignition arc is generated between the ends of the two corresponding ignition electrodes of the spark plug. r _i is the first electrode position between the endpoints of the two corresponding ignition electrodes. r _f is the second electrode position between the ends of the two corresponding ignition electrodes.

The ignition critical potential between the two ends of the spark plug is determined by the critical electric field at the end of the ignition electrode. The critical electric field at the end of the ignition electrode is charged by the voltage of the high-voltage ignition coil, and the blade-shaped discharge tip structure establishes the ignition critical electric field. Fast, so the voltage supplied to the spark plug by the high-voltage ignition coil is reduced. At this time, the charge flows through the center conductor of the spark plug, and the potential drop is also lowered, as shown in Figures 8a to 12b. Test conditions of 1000 rpm (frequency: 16.667-Hz), Figure 8a shows the ignition high voltage of the unmodified Mars plug. 5.81kV, Fig. 8b is the test condition of the ignition high voltage of the spark plug of 5.31kV; the rotation speed of 2000rpm (frequency: 33.333-Hz), and Fig. 9a shows that the ignition high voltage of the unmodified spark plug is 6.44kV, Fig. 9b is Invented the spark ignition high voltage of 5.00kV; the test condition of the rotational speed 3000rpm (frequency: 50-Hz), Figure 10a shows the ignition high voltage of the unmodified Mars plug is 6.56kV, Figure 10b is the ignition high voltage of the spark plug of the present invention The test condition of 5.63 kV; rotation speed 4000 rpm (frequency: 66.667-Hz), Fig. 11a shows that the ignition high voltage of the unmodified spark plug is 6.00 kV, and Fig. 11b is the ignition high voltage of the spark plug of the present invention is 5.56 kV; the rotation speed is 5000 rpm ( The test condition of frequency: 83.333-Hz), Fig. 12a shows that the ignition high voltage of the unmodified spark plug is 6.19 kV, and Fig. 12b shows that the ignition high voltage of the spark plug of the present invention is 5.63 kV. It can be clearly seen from FIGS. 8a to 12b that the present invention can effectively establish a critical electric field for ignition quickly, reduce the accumulated charge time, and lower the terminal voltage of the Mars plug, while the ignition high voltage of the spark plug drops, and the electromagnetic interference interferes with EMI (Electromagnetic Interference). It is also small. When the engine speed is increased, it is more important to quickly establish the ignition critical electric field at the end of the ignition electrode. The present invention is also applicable to provide a stable ignition critical electric field at the end of the ignition electrode when the engine speed is increased. Improve the ignition efficiency of the Mars plug to achieve energy saving and carbon reduction and extend the use of materials.

Referring to FIG. 4-7, when the current passes through the ignition angle coil 40, the Capacitor Discharge Ignition (CDI) 41 and the high voltage coil 42, the first discharge action surface 21 of the center electrode 20 and the grounding The second discharge action surface 31 of the electrode 30 is provided with a first discharge convex portion 22 and a second discharge convex portion 32 whose cross-sectional area is gradually reduced toward the end and corresponding to each other, and the first discharge convex portion 22 and the second discharge convex portion The end of the portion 32 accumulates electric charge and performs concentrated ignition charge density discharge, which not only causes an ignition arc of the first discharge convex portion 22 and the blade edge 32 of the second discharge convex portion to ignite the mixed oil and gas of the combustion chamber, and can effectively avoid The ignition failure and the carbonization between the electrodes can increase the instantaneous ignition efficiency of the engine combustion chamber, and the combustion chamber can be completely burned, thereby improving the performance of the engine.

Referring to Tables 1 and 2, the present invention uses a mixed signal oscilloscope (Agilent 54622D), an exhaust gas analyzer (Hand Held Gas Analyser KANEAUTO 4-4), a high voltage probe (Tektronix P6015A), and a power generator (GWINSTEK GPS4303). And equipment such as signal generator (GFG 8020H) is tested. The exhaust gas pollution data of hydrocarbon HC and carbon monoxide CO as shown in Table 1 were obtained through experiments. The experimental data were calculated and calculated as follows, and the HC and CO waste gas pollution reduction ratios as shown in Table 1 were obtained, among which: In the second test, the HC and CO in the exhaust gas of the engine were decreased by 42.25% and 19.25%, respectively. In the second test, the HC and CO in the exhaust gas of the engine were decreased by 16.57% and 10.06%, respectively; The invention reduces HC and CO in the engine exhaust by 24.49% and 15.30%, respectively. It can be seen from Table 1 that the use of the Mars plug electrode structure designed by the present invention obviously makes the fuel combustion more complete. Moreover, the Mars plug of the present invention is installed on the Gwangyang G5 locomotive, and the data shown in Table 2 is obtained by the riding experiment. When the general-purpose Mars plug is installed, the number of kilometers per liter of fuel can be 25.94, and the present invention is installed. When Mars is plugged, the number of kilometers that can be taken per liter of fuel is 28.34. Therefore, it has been experimentally confirmed that the use of the Mars plug of the present invention can effectively improve the combustion efficiency and the fuel-saving function.

Wu. Conclusion

Therefore, with the above theoretical and structural design, the present invention can not only rapidly establish the ignition critical electric field between the two corresponding ignition electrode terminals of the spark plug, but also concentrate the ignition arc, thereby effectively improving the combustion efficiency, and achieving fuel economy and reducing engine exhaust pollution. Function, and can reduce the voltage of the high-temperature ignition coil of the Mars plug and reduce EMI; and because of the blade-edge equidistance gap structure between the two corresponding ignition electrode terminals, the normal ignition gap of the spark plug can be ensured to reduce the card carbon to avoid ignition failure. The situation occurs, effectively extending the life of the spark plug.

The above is only one of the possible embodiments of the present invention, and is not intended to limit the scope of the patents of the present invention, and the equivalent implementations of other changes according to the contents, features and spirits of the following claims are It should be included in the scope of the patent of the present invention. The invention is specifically defined in the structural features of the request item, is not found in the same kind of articles, and has practicality and progress, has met the requirements of the invention patent, and has filed an application according to law, and invites the bureau to approve the patent according to law to maintain the present invention. The legal rights of the applicant.

10‧‧‧ Ontology

20‧‧‧ center electrode

21‧‧‧First discharge surface

22‧‧‧First discharge convex

220‧‧‧First blade edge

30‧‧‧Feed electrode

31‧‧‧second discharge surface

32‧‧‧Second discharge convex

320‧‧‧second blade edge

34‧‧‧Metal ring

340‧‧‧ thread surface

1 is a perspective view of a first embodiment of the present invention; FIG. 2 is a partial enlarged view of a first embodiment of the present invention; FIG. 3 is a partial plan view of a first embodiment of the present invention; FIG. 5 is a partial enlarged view of a second embodiment of the present invention; FIG. 6 is a partial plan view of a second embodiment of the present invention; 7 is a schematic diagram of the ignition circuit in the application of the present invention; FIG. 8a is a signal waveform analysis diagram of the unmodified Mars plug under the test condition of a rotation speed of 1000 rpm (frequency: 16.667-Hz); FIG. 8b is a rotation speed of 1000 rpm (frequency: 16.667-Hz). The signal waveform analysis diagram of the spark plug of the present invention under the test condition; FIG. 9a is a signal waveform analysis diagram of the unmodified Mars plug under the test condition of the rotation speed 2000 rpm (frequency: 33.333-Hz); FIG. 9b is the rotation speed 2000 rpm (frequency: 33.333) The signal waveform analysis diagram of the spark plug of the present invention under the test condition of -Hz); FIG. 10a is a signal waveform analysis diagram of the unmodified spark plug under the test condition of the rotational speed 3000 rpm (frequency: 50-Hz); FIG. 10b is the rotational speed 3000 rpm (frequency : 50-Hz) test signal condition of the present invention, the waveform analysis diagram of the spark plug; Figure 11a is the signal waveform analysis diagram of the unmodified Mars plug under the test conditions of the speed of 4000 rpm (frequency: 66.667-Hz); Figure 11b shows the speed of 4000 rpm (Frequency: 66.667-Hz) test signal waveform diagram of the present invention under the test conditions; Figure 12a is the signal waveform analysis diagram of the unmodified Mars plug under the test conditions of the speed 5000 rpm (frequency: 83.333-Hz); and Figure 12b The signal waveform analysis diagram of the spark plug of the present invention under the test conditions of a rotational speed of 5000 rpm (frequency: 83.333-Hz).

10. . . Ontology

20. . . Center electrode

twenty one. . . First discharge surface

twenty two. . . First discharge convex

220. . . First edge

30. . . Ground electrode

31. . . Second discharge surface

32. . . Second discharge convex

320. . . Second blade edge

34. . . Metal ring

340. . . Threaded surface

Claims (10)

A symmetric dipole strong electric field discharge type spark plug includes a spark plug body, a center electrode and a ground electrode disposed on the body, and the center electrode and the ground electrode respectively have at least one first discharge function And the at least one second discharge action surface, the first discharge action surface and the second discharge action surface are corresponding to each other and spaced apart by an ignition gap; and the first discharge action surface and the second discharge action surface Having the same number of first discharge protrusions and second discharge protrusions respectively; the first discharge protrusions and the second discharge protrusions respectively have a blade-like tip structure, and are oriented one by one, and the thickness thereof is respectively along the The first discharge action surface and the second discharge action surface are gradually reduced toward the end thereof, and the ends of the first discharge protrusion and the second discharge protrusion are respectively formed with a thickness that is minimized and parallel A first blade edge and a second blade edge of a specific length are extended in a straight line, and the first blade edge and the second blade edge are opposite to each other. The spark plug of claim 1, wherein the first discharge action surface having the first discharge protrusion is located at a top of the center electrode, and the second discharge action surface having the second discharge protrusion is located at the center Above the top of the electrode. The spark plug according to claim 2, wherein the first discharge convex portion and the second discharge convex portion respectively have a plurality of ones, and are oriented one by one. The spark plug according to claim 1, wherein the first discharge action surface has a plurality of equal angular angles distributed on a circumferential surface of the center electrode, and the second discharge action surface of the ground electrode has a plurality of And facing the first discharge active surface on the circumferential surface of the central electrode; each of the first discharge active surface and each of the second discharge active surfaces is respectively provided with a first discharge convex portion and a second discharge convex portion unit. A symmetric dipole strong electric field discharge type spark plug includes a spark plug body, a center electrode and a ground electrode disposed on the body; and the center electrode and the ground electrode respectively have at least one first discharge function And a surface of the second discharge active surface; the first discharge action surface is located at the top of the center electrode, and the second discharge action surface of the ground electrode is located above the top of the center electrode; the first discharge action surface and the The second discharge action surface is corresponding to each other and has an ignition gap therebetween; the first discharge action surface and the second discharge action surface are respectively provided with a plurality of first discharge convex portions and second discharge convex portions; The first discharge protrusion and the second discharge protrusion respectively have a blade-like tip structure and are oppositely oriented one by one, and the thickness thereof is respectively along a normal direction of the first discharge action surface and the second discharge action surface The ends of the first discharge protrusion and the second discharge protrusion are respectively formed with a first blade edge having a thickness reduced to a minimum and extending parallel to a straight line by a specific length. A second blade edge, the blade a first edge to the opposite one by one second blade edge. A symmetric dipole strong electric field discharge type spark plug includes a spark plug body, a center electrode and a ground electrode disposed on the body; the center electrode and the ground electrode respectively have a plurality of first discharges And a plurality of second discharge action surfaces; the plurality of first discharge action surfaces are distributed at a central angle of the center electrode, and the plurality of second discharge action faces are oriented toward the first surface of the center electrode The discharge action surface is respectively spaced apart by an ignition gap; wherein each of the first discharge action surface and each of the second discharge action surfaces is respectively provided with a first discharge convex portion and a second discharge convex portion; a discharge protrusion and the second discharge protrusion respectively have a blade-like tip structure, and are oppositely oriented one by one, and have thicknesses respectively along a normal direction of the first discharge action surface and the second discharge action surface The end portion is gradually reduced, and a first blade edge and a second portion are formed at the ends of the first discharge protrusion and the second discharge protrusion, respectively, and the thickness is minimized and extends parallel to the straight line by a specific length. Sharp edges, the first edge of the blade opposite to the one by the second blade edge. The spark plug according to 5 or 6, wherein the corresponding first blade edge and the second blade edge extend parallel to the straight line, and the linear position is at the first discharge action surface and the second discharge action surface. A vertical plane of the normal. The spark plug according to 5 or 6, wherein each of the first blade edge and each of the second blade edges has a maximum thickness of less than 0.6 mm. The Mars plug according to 5 or 6, wherein the shape of the first discharge convex portion and the second discharge convex portion are symmetrical with each other with one of the normal faces of the normal line being a symmetrical reference plane. The spark plug according to 5 or 6, wherein the first discharge convex portion and the second discharge convex portion respectively shape the center electrode and the ground electrode by a cutting process.