WO2012088662A1

WO2012088662A1 - Discharging spark plug with symmetrical dipolar strong electric field

Info

Publication number: WO2012088662A1
Application number: PCT/CN2010/080372
Authority: WO
Inventors: 苏志超
Original assignee: Su Jye-Chau
Priority date: 2010-12-28
Filing date: 2010-12-28
Publication date: 2012-07-05

Abstract

A discharging spark plug with symmetrical dipolar strong electric field is provided. The spark plug includes a center electrode (20) and a grounding electrode (30). First discharging bulges (22) are mounted on a first discharging acting face (21) of the center electrode (20). Second discharging bulges (32) are mounted on a second discharging acting face (31) of the grounding electrode (30). The number of the first discharging bulges (22) is equal to that of the second discharging bulges (32), and both groups of the discharging bulges are blade-like. Each first discharging bulge (22) is set to face one of the second discharging bulges (32). The effective sectional areas of the ends of the said two groups of the discharging bulges gradually decrease on the normal direction of the first discharging acting face (21) or the second discharging acting face (31) separately. The ends of the first discharging bulges (22) and the second discharging bulges (32) form the first blade edges (220) and second blade edges (320) separately along a rectilinear direction. Each first blade edge (220) faces one second blade edge (320) in sequence. This invention reduces the effective sectional areas of both discharging electrode ends by the structure of discharging blade edges, which increases the electric field intensity of the corresponding ends of the discharging bulges. The aims of increasing combustion efficiency and saving fuel oil are achieved.

Description

Symmetric dipole strong electric field discharge spark plug

The invention relates to a symmetric dipole strong electric field discharge type spark plug, in particular to a spark plug ignition electrode corresponding to the two ends of the center electrode and the ground electrode having a corresponding discharge blade end structure, which is effective for reducing the discharge end of the electrode The 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. Background technique

The known spark plug structure 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 second voltage of the high voltage electrode grounded by the ignition wire The active surface is subjected to high voltage discharge, thereby generating an ignition arc effect to achieve the purpose of the engine blasting operation. It is known from the above that the ignition efficiency of the spark plug and the accuracy of the ignition of the spark plug will be related to the performance of the engine and the performance of the output.

In view of this, all relevant manufacturers have made every effort to innovate and improve the discharge structure of the spark plug. There is a patented premise that can generate multiple spark ignitions, such as Taiwan's new patent No. 71490, "New Most Ignition Spark Plug" and No. 233853 "Multi-Sparking Spark Plug", which is provided with a central positive electrode at the center of the upper and lower insulators. Two central positive electrode rods are arranged on the upper insulator, and the gap between the central positive electrode rods and the outermost positive electrode rods and the ground electrode gap are simultaneously subjected to secondary spark ignition by high voltage electric induction. 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 of 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 attracts the charge, the faster the patent is. The patent only translates the ignition point to the electrode on one side. It does not have the expected effect of reaching the second ignition discharge, so that the second ignition discharge is more effective. difference. Furthermore, although the conventional structure of the "multi-spark spark plug" has a function of more than two spark ignition structures, 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 be directed toward the center. Electrode discharge without The method generates multi-spark ignition by inserting the electrode, and it is not possible to achieve the desired effect of the second ignition discharge, so the aforementioned conventional structure has the necessity of further improvement.

There is also a spark plug patent case that can achieve secondary ignition, such as Taiwan's new patent.

372113 "Interpenetrating (interactive) double spark fire spark plug", which is formed with a circular groove at the radial position of the end face of the center electrode, so that two end faces of the center electrode form two different sizes of the ignition surface. The conventional structure utilizes a tip discharge effect by first raising the discharge electric field using a corner region of the center electrode edge of 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 advance the discharge. The electric field; however, it only has a slightly unipolar boosting discharge electric field. Although it has an ignition effect, it cannot concentrate the arc density. Therefore, it is impossible to increase the combustion efficiency of the engine and the mixed oil vapor can achieve complete combustion. This conventional structure still has the need for further improvement.

Furthermore, there is another patent premise that can produce an arc discharge effect, such as the Taiwan New Type Patent>3⁄4 225355 "Circumferential Jumping Spark Plug" and the new patent >3⁄4第^542542 "Spark Plug", which The biggest difference of the above-mentioned spark plugs is that the ground electrodes are 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 an arc discharge effect, 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 spark plug, so the conventional structure still needs to be improved.

In addition, there are many patents for burning spark plugs, such as China ZL200920058086. 8, ZL200920058085. 3, ZL200520068930. 7 , ZL03249134. 4, ZL02239946. 1, ZL02200024. 0, ZL94218163. 8 and ZL02121285. However, in the prior patents, the center electrode or the ground electrode is mainly designed as a multi-point ignition structure, 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. However, the ignition efficiency must be enhanced by increasing the voltage. Moreover, the charge density cannot be enhanced. The ignition arc cannot be concentrated, However, it not only consumes energy, but also has a long ignition time and too weak an ignition arc during fast operation, resulting in inaccurate ignition efficiency and lack of fuel consumption. Moreover, if the electrode is designed as a pin point structure and cannot withstand high voltage discharge, it is easily damaged and the discharge gap is increased, which is unusable, and the durability is greatly reduced.

There is a patented preamble for reducing the cross-sectional area of the electrode, such as the US patents US 5,461, 210, US 5, 461, 276 and US Pat. No. 7,589, 460, which have enhanced critical electric fields due to the reduction of the electrode cross section. The function, but the end of the electrode is retracted to the center and is pin-pointed. As in the case described in the previous paragraph, after long-term high-voltage discharge, it is easily damaged and the discharge gap is increased, resulting in poor ignition voltage and unusable ignition. Significantly reduce its durability. Summary of the invention

It is an object of the present invention to provide a spark plug which enhances ignition charge density and rapidly establishes 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 shape of a knife 3⁄4, corresponding to each other, and an effective sectional area thereof is respectively along a first discharge action surface and a second discharge action surface The line direction is gradually reduced toward the ends of the two corresponding electrodes, and a first blade edge and a second blade edge extending in a straight line are respectively formed at the ends of the first discharge convex portion and the second discharge convex portion, and the first blade edge and the first blade edge The two blade edges are opposite one another, so that the center electrode and the ground electrode have corresponding discharge edge structure to reduce the effective sectional area of the electrode end, increase the charge density of the discharge blade edge and establish the electric field strength, and the above object can be achieved.

Another object of the present invention is to provide a spark plug which 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, 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 perpendicular to one of its normal directions The symmetrical datum planes are symmetrical with each other, and the above object can be achieved.

Another object of the present invention is to provide an ignition electric field that not only rapidly enhances the effective intensity of the ignition electric field, but also can effectively increase the ignition arc concentration at the active end to improve combustion efficiency and fuel economy, and to ensure the ignition. effective distance. The technical means for achieving the foregoing effects is to design the electrode into 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 two discharge action surfaces. DRAWINGS

Figure 1 is a perspective view of a first embodiment of the present invention;

Figure 2 is a partial enlarged view of the first embodiment of the present invention;

Figure 3 is a partial plan view of a first embodiment of the present invention;

Figure 4 is a perspective view of a second embodiment of the present invention;

Figure 5 is a partial enlarged view of a second embodiment of the present invention;

Figure 6 is a partial plan view of a second embodiment of the present invention;

Figure 7 is a schematic view showing the principle of the ignition circuit when the invention is applied;

Figure 8a is a waveform analysis diagram of the unmodified spark plug under the test conditions of the speed of 0.01 rpm (frequency: 16.667-HZ);

Figure 8b is a signal waveform analysis diagram of the spark plug of the present invention under the test conditions of a speed of 0.01 rpm (frequency: 16.667-HZ);

Figure 9a is a waveform analysis diagram of the unmodified spark plug under the test conditions of 2000 rpm (frequency: 33.333-HZ);

Figure 9b is a signal waveform analysis diagram of the spark plug of the present invention under test conditions of a rotational speed of 2000 rpm (frequency: 33.333-HZ);

Figure 10a is a signal waveform analysis diagram of an unmodified spark plug under test conditions of a rotational speed of 3000 rpm (frequency: 50-HZ); Figure 10b is a signal waveform analysis diagram of the spark plug of the present invention under test conditions of a rotational speed of 3000 rpm (frequency: 50-HZ);

Figure 11a is a waveform analysis diagram of the unmodified spark plug under the test conditions of a speed of 4000 rpm (frequency: 66.667-HZ);

Figure l ib is a signal waveform analysis diagram of the spark plug of the present invention under the test condition of a speed of 4000 rpm (frequency: 66.667-HZ);

Figure 12a is a waveform analysis diagram of the unmodified spark plug under the test conditions of 5000 rpm (frequency: 83.333-HZ);

Fig. 12b is a 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). detailed description

A. Technical Features of the Invention

Referring to Figures 1-3, the spark 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 construction of the spark plug of the present invention includes a spark plug body 10, a center electrode 20, and a ground electrode 30. The body 10 is made of an insulating material 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 line, and generates a high voltage discharge with respect to the ground electrode 30 for ignition. The ground electrode 30 is coupled to a metal ring body 34 having a threaded surface 340, and is screwed to the engine casing by a threaded surface 340 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 2 G and the ground electrode 30 are designed to correspond to a knife-like discharge tip structure to reduce the effective cross-sectional area of the working end of the two electrodes, thereby rapidly enhancing the ignition electric field strength, thereby improving combustion efficiency. In order to save fuel.

Another feature of the present invention is that the center electrode 20 and the grounding tip electrode structure of 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 knives on the electrode, but also the ignition charge density is increased, the combustion efficiency is improved and the fuel is saved, and the plurality of knives are shaped like a tip. 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 knife-like discharge structure, and the first blade edge 220 and the second blade edge 320 extend along a straight line and are used for a long time. Localized wear, 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 4匪, 6匪 and 8mm), which is greatly improved. Service life. And it can reduce carbon deposits.

B. 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 tip end structure of a knife shape, and are oriented one by one, and the thickness thereof gradually increases toward the end of one of the first discharge action surface 21 and the second discharge action surface 31, respectively. The first discharge edge 220 and the second blade edge 320 are respectively formed at the ends of the first discharge convex portion 22 and the second discharge convex portion 32 with a thickness reduced to a minimum and parallel to the straight line by a specific length. A blade edge 220 and a 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 the second blade edge 320 The maximum thickness is less than 0. 6mm (best When viewed from a cross section perpendicular to the longitudinal direction of the first blade edge 220 and the second blade edge 320, the cross-sectional profiles of the first discharge protrusion 22 and the second discharge protrusion 32 are respectively 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 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 parallel line, the straight The line position is on a vertical plane of the normal line of the first discharge action surface 21 and the second discharge action surface 31, so that the first blade edge 220 and the second blade edge 320 are respectively located 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 machining 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.

C. Second 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. 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 a first discharge convex portion 22 and a second discharge convex portion 32, and the first discharge convex portion 22 and the second portion The discharge convex portions 32 are oriented one by one, 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-like tip structure, and A first blade edge 220 and a second blade edge 320 are formed at a distal end of the discharge protrusion 22 and the second discharge protrusion 32, respectively, and a first blade edge 220 and a second blade edge 320 are extended to a minimum length and parallel to the straight line. The second blade edge 320 is parallel and one by one, and each of the first blade edge 220 and the second blade edge 320 itself extends longer than the thickness, and the maximum thickness of each of the first blade edge 220 and each of the second blade edge 320 respectively Less than 0. 6mm (preferably less than 0.2 mm), if viewed from a cross section perpendicular to the longitudinal direction of the first blade edge 220 and the second blade edge 320, the first discharge protrusion 22 and the second discharge protrusion Cross section of 32 The outlines are in a V shape. In this embodiment, the first discharge convex portion 22 and the second discharge convex portion 32 are symmetrical with each other with one of the normal planes being perpendicular to each other, 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 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 have the center electrode 20 and the ground electrode 30 is formed by a cutting technique, and the first discharge convex portion 22 and the second discharge convex portion 32 are made of the same material and integrally formed with the center electrode 20 and the ground electrode 30, respectively.

D. 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 a high binding force to the valence electrons of the outer orbital conduction, and the conductivity of the substance is poor. Also higher. The nucleus has a low binding force to the valence electrons of the outer 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 ordinary temperature, its outer orbital conduction band valence electrons are hardly bound by the nucleus and become free electrons, so it can be a good conductor. The discharge phenomenon 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 conduction of the air conducts the valence electrons from the binding force of the nucleus and conducts electricity, which is commonly called 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.

It is inferred from the above that the ignition of a typical spark plug is also the principle of using the end 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 electrode 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, both ends of the ignition electrode At the same time, a potential drop of the ignition electrode is established, at which time the charge begins to conduct electricity through the mixed oil and gas compressed in the cylinder of the engine, generating an arc, igniting the compressed mixed oil and gas in the engine cylinder to cause explosive combustion. Therefore, the total voltage drop at the end of the overall spark plug is the potential drop of the center electrode conductor plus the potential drop of the ignition electrode. The concentration and real-time nature of the ignition arc has a great impact on the efficiency of the engine. When the combustion of the mixed oil and gas in the cylinder is more concentrated, the ignition efficiency is higher. When the ignition electric field is faster, the mixed oil and gas is compressed into the engine cylinder. Conductive critical electric field, the better the real-time ignition. Generally, the ignition electrode end point of the conventional spark plug is too large, and the charge density is low. 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 line voltage. To establish a critical conductive electric field that causes the ignition arc, but the higher voltage of the high-voltage ignition line also increases the dry effect of the electromagnetic wave dryness (E EMI), and further; The surface area of the corresponding end of the ignition electrode is too large, the ignition arc is less concentrated, the ignition arc efficiency is reduced, and the high voltage ignition line has a higher voltage. It also requires more time to accumulate charge to establish an electric field, which is liable to cause ignition delay and reduce engine efficiency.

This patent uses the electric field Gauss's law (Gaus sian Theorem) to reduce the effective cross-sectional area at the opposite ends of the ignition electrode of the spark plug to increase the charge density and accelerate the establishment of the critical conductive electric field and charge of the mixed oil and gas in the engine cylinder. The density is increased, and the electric field strength is accelerated, so that the corresponding ignition point of the spark plug ignition electrode can easily reach the conductive critical electric field of the mixed oil and gas, and the ignition arc is generated. Then, by the knife-like end-point ignition structure, the guiding arc is concentrated and the ignition speed is increased. Real-time and accuracy, and improve the combustion efficiency of mixed oil and gas in the engine cylinder, reduce engine exhaust pollution and save fuel.

The basic circuit principle of spark plug ignition is shown in Figure 7. The ignition principle is that when the spark plug is connected to current I, it will generate a charge flow at the center electrode. The relationship between the current and the passing charge and time is as shown in equations (1) and ( 2):

/ = Aq /At (1 )

Aq = IAt (2) where Δ is the total static charge of the high-voltage line igniting through the spark plug electrode each time; Δ is the time of the high-voltage line 圏 each time the charge flows through the spark plug electrode.

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

εΦ _Ε = ε · dA =Aq (3)

ε ⁼ . (5) where, ^. It is the permittivity of free space; ε is the dielectric constant of mixed oil and gas; it is the dielectric constant of mixed oil and gas: = s/s. Φ is the electric field flux ( _e i _ec tric flux); is the electric field between the two corresponding ignition electrode terminals; ύίΑ is the effective cross-sectional area of the electrode. The following two equations (6) of the ignition critical potential between the ends of the corresponding ignition electrodes are utilized. When the electric field is rapidly established, under the condition that the distance between the two ignition electrodes is constant, the ignition critical potential 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 under the condition that the current flowing through the spark plug and the distance between the two opposite ignition electrodes are constant, when the effective sectional area of the end of the ignition electrode is reduced, the electric field strength increases, and the relative electric field energy density is 1⁄2. Equation (7) increases and the ignition arc increases.

V _T = -T ^f E · df

(6)

1 _F 2 where is the electric field energy density between the endpoints of the two corresponding ignition electrodes. ^ is the distance between the endpoints of the two corresponding ignition electrodes. A critical potential for the ignition arc is generated between the ends of the two corresponding ignition electrodes of the spark plug. The first electrode position between the ends of the two corresponding ignition electrodes. ^r / is the second electrode position between the ends of the two corresponding ignition electrodes.

The ignition critical potential between the two corresponding ignition electrode terminals of the spark plug is established by the critical electric field at the end of the ignition electrode, and the critical electric field at the end of the ignition electrode is supplied by the voltage of the high voltage ignition line ,, the knife The blade-shaped discharge tip structure establishes a critical ignition electric field faster, so that the voltage supplied to the spark plug by the high-voltage ignition wire 降低 can be lowered. At this time, the charge flows through the center electrode of the spark plug, and the potential drop is also lowered. Please refer to FIGS. 8a to 12b. Show. The test condition of the rotational speed of l rpm (frequency: 16. 667-HZ), Fig. 8a shows that the ignition high voltage of the unmodified spark plug is 5.81 kV, and Fig. 8b shows that the ignition high voltage of the spark plug of the present invention is 5.31 kV; the rotational speed is 2000 rpm (frequency The igniting high voltage of the spark plug of the present invention is 5.4 kV, and the ignition high voltage of the spark plug of the present invention is 5. OOkV; the rotational speed is 3000 rpm (frequency: 50-HZ). Figure 10a shows the ignition high voltage of the unmodified spark plug is 6.56kV, Figure 10b shows the ignition high voltage of the spark plug of the present invention is 5. 63kV; the rotational speed of 4000rpm (frequency: 66. 667-HZ) test conditions, 11a is the ignition high voltage of the unmodified spark plug is 6. OOkV, Fig. 1 ib is the ignition condition of the spark plug of the invention is 5.56kV; the test condition of the speed of 5000rpm (frequency: 83.333-HZ), Fig. 12a is not The igniting high voltage of the spark plug of the present invention is 5. 63 kV. It can be clearly seen from Figures 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 voltage at the end of the spark plug, while the ignition high voltage of the spark plug decreases, and the electromagnetic interference EMI 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 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, thereby improving the ignition efficiency of the spark plug and achieving energy saving. Carbon reduction and the purpose of extending the use of materials.

Referring to FIG. 4-7, when the current is passed through the ignition angle 圏40, the Capacitor Discharge Igni-Ion (CDI) 41 and the high-voltage coil ,42, the first of the center electrodes 20 The discharge discharge surface 21 and the second discharge action surface 31 of the ground electrode 30 are 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 thereof The portion 22 and the end of the second discharge protrusion 32 collect charges and perform concentrated ignition charge density discharge, which not only causes an ignition arc of the first discharge protrusion 22 and the blade edge 32 of the second discharge protrusion to ignite the combustion chamber. Hybrid oil and gas, and can effectively avoid ignition failure and carbonization between the electrodes, which can increase the instantaneous ignition efficiency of the engine combustion chamber, complete combustion of the combustion chamber, and improve the efficiency of engine operation. Referring to Tables 1 and 2, the present invention uses a mixed signal oscilloscope (Ag il ent 54622D) exhaust gas analyzer (Hand He ld Gas Ana lyser KANEAUTO 4-4), a high voltage probe (Tekt ron ix P6015A), power generation Instrumentation (GWINSTEK GPS4303) and signal generator (GFG 8020H) are used for testing. 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: The second test, the present invention reduces the HC and CO in the exhaust of the engine by 16.57% and 10, respectively. 0%。 The second test, the present invention reduced the HC and CO in the exhaust of the engine by 24.49% and 15.30%. It can be seen from Table 1 that the spark plug electrode structure designed by the present invention obviously makes the oil combustion more complete. Moreover, the spark plug of the present invention is installed on the Gwangyang G5 locomotive, and the data shown in Table 2 is obtained by the riding test. When the conventional spark plug is installed, the number of kilometers per liter of fuel can be 25.94, the installation When the spark plug is invented, the number of kilometers per liter of fuel can be 28.34. Therefore, it has been experimentally confirmed that the use of the spark plug of the present invention can effectively improve combustion efficiency and fuel economy. Table 1: Comparison of the decline in HC and 00 exhaust gas pollution values

Table 2: Fuel consumption analysis (using the car model Gwangyang G5)

Spark plug before the improvement Spark plug of the invention Test times Number of mileage Consumption of fuel Test date Test times Number of miles consumed Fuel consumption Test date

1 1708 4.43 2009/9/25 1 2670 3.27 2009/12/12

2 1820 3.53 2009/10/9 2 2736 3.27 2009/12/18

3 1923 3.53 2009/10/15 3 2861 1.67 2009/12/25

4 2001 3.39 2009/10/21 4 2882 1.67 2009/12/27

5 2094 4.1 2009/10/30 5 2950 1.62 2010/1/6

E. Conclusion

Therefore, with the above theoretical and structural design, the invention can not only quickly establish the ignition critical electric field between the two corresponding ignition electrode terminals of the spark plug, the concentrated ignition arc, effectively improve the combustion efficiency, and achieve fuel economy and reduce the exhaust pollution. Function, and can reduce the high voltage ignition line voltage of the spark plug and reduce the EM I; and the blade-edge equidistance gap structure between the two corresponding ignition electrode terminals can ensure the normal ignition gap of the spark plug to avoid the ignition failure. Effectively extend the life of the spark plug.

The above is only a possible embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalents of other changes, which are based on the contents, features and spirit of the following claims. It should be included in the scope of the patent of the present invention.

Claims

A symmetrical dipole strong electric field discharge type spark plug comprising a spark plug body, a center electrode and a ground electrode disposed on the body, the center electrode and the ground electrode respectively having at least one first discharge The active surface 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 feature is:

The first discharge action surface and the second discharge action surface are respectively provided with the same number of first discharge convex portions and second discharge convex portions; the first discharge convex portion and the second discharge convex portion respectively have a knife shape The tip structure is oppositely oriented one by one, and the thickness thereof is gradually reduced toward the end of the first discharge action surface and the second discharge action surface toward the end thereof, and the first discharge protrusion and the second portion are respectively The ends of the discharge protrusions are respectively formed with a first blade edge and a second blade edge which are reduced in thickness and extend parallel to the straight line by a specific length, and the first blade edge and the second blade edge are opposite to each other.

2. The spark plug of claim 1, wherein the first discharge active surface having the first discharge convex portion is located at a top of the central electrode, and the second discharge active surface having the second discharge convex portion is located at the Above the top of the center electrode.

3. The spark plug of claim 2, wherein the first discharge protrusion and the second discharge protrusion respectively have a plurality of, respectively, and are oriented one by one.

4. 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.

5. The spark plug of claim 1, wherein the corresponding first blade edge and the second blade edge extend parallel to the parallel line, the linear position being at the first discharge action surface and the second discharge action a vertical plane of the normal of the face.

6. The maximum thickness of each of the first blade edge and each of the second blade edge is less than 0.6.

7. The spark plug of claim 1, wherein the first discharge protrusion and the second discharge protrusion are symmetrical with each other with a vertical plane of the normal line being a symmetrical reference plane.

8. The spark plug of claim 1, wherein the first discharge protrusion and the second discharge protrusion respectively shape the center electrode and the ground electrode by a cutting technique.

A symmetric dipole strong electric field discharge type spark plug comprising a spark plug body, a center electrode and a ground electrode disposed on the body; the center electrode and the ground electrode respectively having at least one first discharge An active surface and at least one second discharge action 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 is The second discharge action surfaces are corresponding to each other and have an ignition gap at intervals; the feature is:

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 convex portion and the second discharge convex portion respectively have a knife-like tip end And the thickness of the first discharge action surface and the second discharge action surface are gradually reduced toward the end thereof, and the first discharge protrusion and the second discharge are respectively formed. The ends of the convex portions are respectively formed with a first blade edge and a second blade edge which are reduced in thickness and extend parallel to the straight line by a specific length, and the first blade edge and the second blade edge are opposite to each other.

The spark plug of claim 9, wherein the corresponding first blade edge and the second blade edge extend parallel to the parallel line, the linear position at the first discharge action surface and the second discharge A vertical plane of the normal of the active surface.

The maximum thickness of each of the first blade edge and each of the second blade edge is less than 0.6 mm, respectively.

1. The spark plug of claim 9, wherein the shape of the first discharge protrusion and the second discharge protrusion are symmetrical with each other with a vertical plane of the normal line being a symmetrical reference plane.

1. The spark plug of claim 9, wherein the first discharge protrusion and the second discharge protrusion respectively shape the center electrode and the ground electrode by a cutting technique.

14. A symmetric dipole strong electric field discharge spark plug comprising a spark plug body and a center electrode and a ground electrode on the body; the center electrode and the ground electrode respectively have a plurality of first discharge action surfaces and a plurality of second discharge action surfaces; the plurality of first discharge action surfaces and the like An angular distribution is distributed on a peripheral surface of the center electrode, and the plurality of second discharge action surfaces are respectively oriented toward the first discharge action surface on the circumferential surface of the center electrode and are respectively spaced apart by an ignition gap; and the feature is:

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; the first discharge convex portion and the second discharge convex portion respectively form a knife 3⁄4-shaped tip structures, which are oriented one by one, and their thicknesses are gradually reduced toward the ends thereof along the normal direction of the first discharge action surface and the second discharge action surface, respectively, and the first discharge protrusions are The ends of the second discharge protrusions are respectively formed with a first blade edge and a second blade edge which are reduced in thickness and extend parallel to the straight line by a specific length, and the first blade edge and the second blade edge are opposite to each other.

15. The spark plug of claim 14, wherein the corresponding first blade edge and the second blade edge extend parallel to the parallel line, the linear position at the first discharge action surface and the second discharge action a vertical plane of the normal of the face.

17. The spark plug of claim 14, wherein the shape of the first discharge protrusion and the second discharge protrusion are symmetrical with each other with a vertical plane of the normal line being a symmetrical reference plane.

18. The spark plug of claim 14, wherein the first discharge protrusion and the second discharge protrusion respectively shape the center electrode and the ground electrode by a cutting technique.