Two-point ignition spark plug
By employing a dual-electrode, two-point ignition design, and using spark plugs with symmetrically distributed inclined discharge gaps and gradually changing outer diameters, the problem of spark point interference in multi-electrode spark plugs is solved, achieving higher energy density spark discharge and higher combustion efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 谭子斌
- Filing Date
- 2025-03-31
- Publication Date
- 2026-05-19
AI Technical Summary
In the existing multi-electrode design of spark plugs, interference can easily occur between the ignition points, leading to reduced combustion efficiency and incomplete combustion.
Design a spark plug with dual electrode two-point ignition, using symmetrically distributed ignition components to form an inclined discharge gap to ensure that the spark diffusion paths do not overlap, and improve the electric field strength and stability through a gradually changing outer diameter structure and coaxial design.
It effectively extends the spark discharge path, improves combustion efficiency, enhances the energy density of the electric spark, and promotes better combustion of the gas-fuel mixture in the cylinder.
Smart Images
Figure CN224264458U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of spark plugs, and in particular to a two-point ignition spark plug. Background Technology
[0002] The function of a spark plug is to discharge the pulsed high-voltage electricity delivered by the high-voltage wire, breaking down the air between the two electrodes of the spark plug and generating an electric spark to ignite the air-fuel mixture in the cylinder. Currently, spark plugs are mainly divided into single-electrode spark plugs and multi-electrode spark plugs. Single-electrode spark plugs ignite on a single electrode with a small ignition area; multi-electrode spark plugs, such as four-electrode spark plugs, although having multiple ignition points, usually have these points arranged in a ring around the outer periphery of the central electrode. When multiple ignition points ignite simultaneously, the spark spreads outward from the center, and the sparks between adjacent ignition points interfere with each other, resulting in poor ignition, reduced combustion efficiency, and even incomplete combustion. Utility Model Content
[0003] In view of this, in order to solve the above-mentioned technical problems, this utility model provides a spark plug with two electrodes, having two ignition points, and the combustion between the two ignition points will not cause interference, which can be ignited in a two-point manner.
[0004] The objective of this utility model is achieved through the following technical solution:
[0005] A two-point ignition spark plug includes a central electrode, an insulator, and a metal shell sequentially connected. The first end of the central electrode extends to the end of the insulator and is connected to a terminal nut, and the second end passes through the insulator and is connected to a conductive ring at the end. It also includes two symmetrically distributed ignition components. The ignition components include a first electrode disposed on the conductive ring and a second electrode disposed on the metal shell. An inclined discharge gap is formed between the ends of the first electrode and the ends of the second electrode. The axes of the two discharge gaps are mirror-symmetrically distributed with respect to the axis of the central electrode.
[0006] In the above technical solution, two sets of symmetrically distributed ignition components are set to form a dual ignition source. When the ignition components ignite, the discharge gap formed between the end of the first electrode and the end of the second electrode will generate a spark. The spark will spread rapidly along a plane perpendicular to the axis of the discharge gap. Since the axis of the discharge gap is set at an angle, the two spark diffusion planes will form an angle, so that the spark diffusion paths of the two ignition sources will not overlap and cause interference. This can effectively extend the spark discharge path and generate an electric spark with higher energy density, improve combustion efficiency, and better promote the combustion of the in-cylinder mixture.
[0007] Optionally, in one possible implementation, both the first electrode and the second electrode have a gradually changing outer diameter, and the opposite ends of the first electrode and the second electrode are pointed, with the line connecting the tips of the first electrode and the second electrode forming the axis of the discharge gap.
[0008] In the above technical solution, the outer diameter gradient structure can increase the electric field strength along the axial direction and form an exponentially enhanced electric field gradient at the tip, which can achieve more stable spark discharge under the same ignition energy and further improve ignition efficiency.
[0009] Alternatively, in one possible implementation, the conductive ring is coaxially disposed with the central electrode, and the conductive ring extends radially outward along the central electrode.
[0010] In the above technical solution, the coaxial structure ensures impedance matching between the conductive ring and the central electrode, resulting in a radially distributed ignition pulse current. Simultaneously, the coaxial structure allows for more precise positioning of the first electrode on the conductive ring, enabling the two first electrodes to be accurately arranged symmetrically around the central electrode.
[0011] Optionally, in one possible implementation, the first electrode is disposed on the upper end face of the metal casing, and the second electrode is disposed on the lower end face of the conductive ring.
[0012] In the above technical solution, the first electrode and the second electrode are respectively disposed on the upper end face of the metal shell and the lower end face of the conductive ring. That is, by disposing the electrodes on the end faces, the first electrode or the second electrode can have a larger contact area, thereby improving the stability of its placement and the connection strength, and also ensuring that the first electrode and the second electrode are always disposed relative to each other.
[0013] Alternatively, in one possible implementation, the included angle between the two axes is in the range of 30°-60°.
[0014] In the above technical solution, the included angle of 30°-60° makes the two discharge gaps form a "V" shape, which ensures that the diffusion planes of the two ignition sources can form a certain included angle without causing interference, and will not reduce the extension space of the spark due to the angle being too large or too small.
[0015] Alternatively, in one possible implementation, the conductive ring is fixed to the outer periphery of the end of the central electrode by welding.
[0016] In the above technical solution, by welding the conductive ring to the end of the central electrode, the connection stability between the conductive ring and the central electrode can be ensured, thereby guaranteeing its performance.
[0017] Alternatively, in one possible implementation, a resistor is also provided on the outer periphery of the central electrode.
[0018] In the above technical solution, the resistor is used to shield the electromagnetic waves or radio waves generated by the electronic components in the vehicle, so as to prevent them from interfering with the voltage of the center electrode.
[0019] Optionally, in one possible implementation, the inner wall of the metal casing is provided with stepped air guide grooves, the depth of which varies in a wave-like shape along the axial direction.
[0020] In the above technical solution, the stepped air guide groove increases the surface area of the inner wall of the metal shell, providing more heat dissipation channels for the spark plug. When the engine is running, the heat generated by the spark plug can be transferred to the surface of the metal shell more quickly through the air guide groove, and then dissipated through heat exchange between the shell and the surrounding cooling medium. Attached Figure Description
[0021] Figure 1 This is a cross-sectional view of the overall structure of one embodiment.
[0022] Figure 2 This is a schematic diagram of the structure of one of the ignition components in one embodiment.
[0023] Reference numerals: 1-Central electrode; 11-Resistor; 2-Insulator; 3-Metal casing; 4-Conductive ring; 5-Ignition assembly; 51-First electrode; 52-Second electrode; 6-Axis. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0025] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0026] Please refer to Figures 1-2 A preferred embodiment of this utility model is as follows.
[0027] A two-point ignition spark plug includes a central electrode 1, an insulator 2, and a metal casing 3 sequentially connected. The first end of the central electrode 1 extends to the end of the insulator 2 and is connected to a terminal nut; the second end passes through the insulator 2 and is connected to a conductive ring 4 at its end. It also includes two symmetrically distributed ignition components 5. Each ignition component 5 includes a first electrode 51 disposed on the conductive ring 4 and a second electrode 52 disposed on the metal casing 3. An inclined discharge gap is formed between the ends of the first electrode 51 and the second electrode 52. The axes 6 of the two discharge gaps are mirror-symmetrically distributed with respect to the axis 6 of the central electrode 1. The two sets of ignition components 5 are symmetrically distributed along the central axis of the central electrode 1.
[0028] In this embodiment, two sets of symmetrically distributed ignition components 5 are set to form a dual ignition source. When the ignition components 5 are ignited, the discharge gap formed between the end of the first electrode 51 and the end of the second electrode 52 will generate a spark. The spark will spread rapidly along the plane perpendicular to the axis 6 of the discharge gap. Since the axis 6 of the discharge gap is set at an angle, the two spark diffusion planes will form an angle, so that the spark diffusion paths of the two ignition sources will not overlap and cause interference. This can effectively extend the spark discharge path and generate an electric spark with higher energy density, improve combustion efficiency, and better promote the combustion of the in-cylinder mixture.
[0029] In this embodiment, both the first electrode 51 and the second electrode 52 have a gradually changing outer diameter, and the opposite ends of the first electrode 51 and the second electrode 52 are pointed. The line connecting the pointed ends of the first electrode 51 and the second electrode 52 is the axis 6 of the discharge gap. Specifically, the structure of the first electrode 51 and the second electrode 52 can be conical, and the discharge gap at the pointed ends can be set to 0.7-1.0 mm.
[0030] A tapered outer diameter structure allows the electric field strength to increase axially and forms an exponentially enhanced electric field gradient at the tip, enabling more stable spark discharge at the same ignition energy and further improving ignition efficiency. Furthermore, the tapered outer diameter structure can also be a triangular pyramid or a square pyramid, etc.
[0031] It should be noted that the conductive ring 4 is coaxially arranged with the central electrode 1, and the conductive ring 4 extends radially outward along the central electrode 1. That is, the conductive ring 4 has a circular ring structure, which can be fitted onto the outer circumference of the central electrode 1. Alternatively, it can be a thin cylindrical structure, which can be directly fixed to the end of the central electrode 1.
[0032] The coaxial structure ensures impedance matching between the conductive ring 4 and the central electrode 1, resulting in a radially distributed ignition pulse current. Simultaneously, the coaxial structure allows for more precise positioning of the first electrode 51 on the conductive ring 4, ensuring that the two first electrodes 51 are accurately arranged symmetrically with the central electrode 1 as the axis 6.
[0033] In this embodiment, the first electrode 51 is disposed on the upper end face of the metal casing 3, and the second electrode 52 is disposed on the lower end face of the conductive ring 4. The first electrode 51 and the second electrode 52 are respectively disposed on the upper end face of the metal casing 3 and the lower end face of the conductive ring 4. By disposing the electrodes on the end faces, the first electrode 51 or the second electrode 52 can have a larger contact area, thereby improving the stability and connection strength of their placement. This also ensures that the first electrode 51 and the second electrode 52 always remain in a relative arrangement.
[0034] In this embodiment, the included angle between the two axes 6 is in the range of 30°-60°. The included angle of 30°-60° makes the two discharge gaps have a "V" shape layout, which ensures that the diffusion planes of the two ignition sources can form a certain included angle without causing interference, and will not reduce the extension space of the spark due to the angle being too large or too small.
[0035] In this embodiment, the conductive ring 4 is fixed to the outer periphery of the end of the central electrode 1 by welding. By welding the conductive ring 4 to the end of the central electrode 1, the connection stability between the conductive ring 4 and the central electrode 1 can be ensured, thereby guaranteeing its performance. Of course, as another embodiment, when the conductive ring 4 has a circular structure, the conductive ring 4 can also be directly fitted onto the outer periphery of the central electrode 1 by interference fit.
[0036] It should be noted that a resistor 11 is also provided on the outer periphery of the central electrode 1. The resistor 11 is used to shield the electromagnetic waves or radio waves generated by the electronic components in the vehicle from interference, so as to prevent them from interfering with the voltage of the central electrode.
[0037] In this embodiment, the inner wall of the metal casing 3 is also provided with stepped air guide grooves, the depth of which varies in a wave-like shape along the axis 6. The stepped air guide grooves increase the surface area of the inner wall of the metal casing 3, providing more heat dissipation channels for the spark plug. When the engine is running, the heat generated by the spark plug can be transferred to the surface of the metal casing 3 more quickly through the air guide grooves, and then dissipated through heat exchange between the casing and the surrounding cooling medium.
[0038] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0040] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it will be apparent to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.
Claims
1. A spark plug with two-point ignition, characterized in that, The device includes a central electrode, an insulator, and a metal casing that are sequentially nested together. The first end of the central electrode extends to the end of the insulator and is connected to a terminal nut, while the second end passes through the insulator and is connected to a conductive ring at its end. It also includes two symmetrically distributed ignition assemblies. Each ignition assembly includes a first electrode disposed on the conductive ring and a second electrode disposed on the metal casing. An inclined discharge gap is formed between the ends of the first and second electrodes. The axes of the two discharge gaps are mirror-symmetrically distributed relative to the axis of the central electrode, and the included angle between the two axes ranges from 30° to 60°.
2. The spark plug with two-point ignition according to claim 1, characterized in that, Both the first electrode and the second electrode have a gradually changing outer diameter structure, and the opposite ends of the first electrode and the second electrode are pointed. The line connecting the pointed ends of the first electrode and the second electrode is the axis of the discharge gap.
3. The spark plug with two-point ignition according to claim 1, characterized in that, The conductive ring is coaxially arranged with the central electrode, and the conductive ring extends outward along the radial direction of the central electrode.
4. A spark plug with two-point ignition according to claim 3, characterized in that, The first electrode is disposed on the upper end face of the metal casing, and the second electrode is disposed on the lower end face of the conductive ring.
5. A spark plug with two-point ignition according to claim 1, characterized in that, The conductive ring is fixed to the outer periphery of the end of the central electrode by welding.
6. A spark plug with two-point ignition according to claim 1, characterized in that, A resistor is also wound around the outer periphery of the central electrode.
7. A spark plug with two-point ignition according to claim 1, characterized in that, The inner wall of the metal shell is provided with stepped air guide grooves, and the depth of the air guide grooves varies in a wave-like shape along the axial direction.