A spark plug matched with a high-energy high-voltage high-current ignition coil

Abstract

The utility model provides a spark plug matched with the ignition coil of big energy big voltage big current belongs to the technical field of spark plug, including thread cover, ceramic tube fixedly installed outside the thread cover, center electrode fixedly installed outside the ceramic tube, and first iridium gold electrode head fixedly installed at the inclined surface of center electrode, still include side electrode fixedly installed outside the ceramic tube, second iridium gold electrode head fixedly installed in the corresponding position of side electrode and first iridium gold electrode head of center electrode, electrode retainer ring fixedly installed outside the thread cover, the utility model discloses through the discharge plane design of sixty degrees promotes flame radial extension, makes the effective promotion of flame propagation speed, effectively strengthens the ignition performance, and iridium gold electrode head cooperation bending structure significantly reduces the flame elimination effect, reduces heat absorption, guarantees the temperature reduction of working time, and the electrode protection ring of additional can double protection iridium gold electrode in welding and working.

Description

Technical Field

[0001] This utility model belongs to the technical field of spark plugs, specifically relating to spark plugs that are matched with ignition coils with high energy, high voltage, and high current. Background Technology

[0002] Spark plugs are the core component of the internal combustion engine ignition system. Their function is to generate an electric spark by breaking down the electrode gap with high voltage, which ignites the combustible mixture in the cylinder and drives the piston.

[0003] Currently, most traditional spark plugs on the market adopt a single-point discharge design, with only one discharge channel between the main electrode and the side electrode. Their typical operating parameters are an ignition voltage of about 30kV, a magnetizing current of less than 15A, and an ignition energy of no more than 150mJ. This structure often fails to ignite due to insufficient single-point discharge energy when facing lean combustion conditions or low flash point mixtures. In addition, it lacks an electrode protection mechanism and is prone to electrode erosion or carbon buildup under high pressure and high temperature environments. Especially in high compression ratio engines or applications using alternative fuels (such as hydrogen and ethanol), existing spark plugs are difficult to achieve stable ignition, and the energy loss during discharge is relatively large, which restricts further improvement in combustion efficiency. Utility Model Content

[0004] The purpose of this invention is to provide spark plugs that match ignition coils with high energy, high voltage, and high current, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A spark plug that matches a high-energy, high-voltage, and high-current ignition coil includes a threaded sleeve, a ceramic tube fixedly mounted on the outside of the threaded sleeve, a center electrode fixedly mounted on the outside of the ceramic tube, and a first iridium electrode head fixedly mounted on the inclined surface of the center electrode.

[0007] It also includes a side electrode fixedly installed on the outside of the ceramic tube, a second iridium electrode head fixedly installed on the side electrode at a position corresponding to the first iridium electrode head of the center electrode, an electrode guard ring fixedly installed on the outside of the threaded sleeve, a hexagonal helix fixedly installed on the outside of one end of the threaded sleeve, and an insulator fixedly installed on the end of the threaded sleeve. The end of the center electrode is machined into an equilateral triangular bevel structure with the two bevel planes forming a 60-degree angle to enhance flame propagation efficiency. The side electrode has a bent structure, and the bevel at the bend has the same angle as the bevel at the end of the center electrode, and the bend angle of the side electrode is 120 degrees.

[0008] As a preferred embodiment of this invention, the bending structure of the side electrode enables the second iridium electrode head and the first iridium electrode head to form an optimized discharge gap.

[0009] In a preferred embodiment of this invention, the second iridium electrode head is coaxially mounted with the first iridium electrode head.

[0010] As a preferred embodiment of this utility model, the distance between the end faces of the first iridium electrode head and the second iridium electrode head is 1.5 mm, which can simultaneously form two pairs of positive and negative electrodes for discharge.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the 60-degree discharge plane design promotes the radial expansion of the flame, effectively increasing the flame propagation speed and enhancing the ignition performance; the iridium electrode head, combined with the bending structure, significantly reduces the flame extinguishing effect, reduces heat absorption, and ensures a lower operating temperature; the added electrode protection ring provides double protection for the iridium electrode during welding and operation. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a partial schematic diagram of the overall structure of this utility model;

[0015] Figure 3 This is a plan view of the overall electrode retaining ring structure of this utility model;

[0016] Figure 4 This is a standard schematic diagram of the structural angles of the center electrode and side electrode of this utility model.

[0017] In the diagram: 110, threaded sleeve; 120, ceramic tube; 130, center electrode; 140, first iridium electrode head; 150, side electrode; 160, second iridium electrode head; 170, electrode retaining ring; 180, hexagonal helix; 190, insulator. Detailed Implementation

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0021] Example

[0022] Reference Figures 1-4 This is an embodiment of the present invention. This embodiment provides a spark plug that matches a high-energy, high-voltage, and high-current ignition coil, including a threaded sleeve 110, a ceramic tube 120 fixedly installed on the outside of the threaded sleeve 110, a center electrode 130 fixedly installed on the outside of the ceramic tube 120, and a first iridium electrode head 140 fixedly installed on the inclined surface of the center electrode 130.

[0023] It also includes a side electrode 150 fixedly installed on the outside of the ceramic tube 120, a second iridium electrode head 160 fixedly installed on the side electrode 150 at a position corresponding to the first iridium electrode head 140 of the center electrode 130, an electrode guard ring 170 fixedly installed on the outside of the threaded sleeve 110, a hexagonal spiral 180 fixedly installed on the outside of one end of the threaded sleeve 110, and an insulator 190 fixedly installed on the end of the threaded sleeve 110. The end of the center electrode 130 is processed into an equilateral triangular bevel structure with the two bevel planes forming a 60-degree angle to enhance flame propagation efficiency. The side electrode 150 has a bent structure, and the bevel angle at the bend is the same as the bevel angle at the end of the center electrode 130, and the bending angle of the side electrode is 120 degrees.

[0024] Specifically, the double iridium electrode head 140 on the 60-degree inclined surface of the central electrode 130 cooperates with the corresponding electrode head 160 on the 120-degree bent structure of the side electrode 150 to form two pairs of parallel discharge gaps. At least one reliable discharge is guaranteed in each discharge cycle, effectively improving the ignition success rate. Adopting the high-energy ignition requirements of 50kV / 25A / 260mJ, it can ignite lean mixtures with an air-fuel ratio >20:1. The electrode guard ring 170 protects the iridium electrode head from mechanical damage during the welding process. The dual discharge channel design can still maintain normal ignition when one side electrode is ablated. The 60-degree discharge plane angle causes the initial flame core to expand radially, increasing the flame propagation speed by 35%. The 120-degree bent side electrode 150 reduces heat conduction loss, and the electrode guard ring 170 blocks the high-temperature airflow in the combustion chamber, thus reducing the electrode operating temperature.

[0025] Preferably, the bending structure of the side electrode 150 allows the second iridium electrode head 160 and the first iridium electrode head 140 to form an optimized discharge gap.

[0026] Among them, the melting point of the first iridium electrode head 140 and the second iridium electrode head 160 reaches 2450℃, which is twice as high as the temperature resistance of traditional nickel alloy electrodes.

[0027] Furthermore, the second iridium electrode head 160 is coaxially mounted with the first iridium electrode head 140, and the distance between the end faces of the first iridium electrode head 140 and the second iridium electrode head 160 is 1.5 mm, which can simultaneously form two pairs of positive and negative electrodes for discharge.

[0028] Among them, the 1.5mm increased gap combined with high-energy ignition forms a fireball core area with a diameter >3mm, effectively solving the problem of difficult ignition of alternative fuels such as hydrogen and ethanol.

[0029] When in use, when the high voltage current is transmitted to the spark plug through the ignition coil, the current first flows through the center electrode 130, and a potential difference is formed between the first iridium electrode head 140 on the two sets of sixty-degree inclined surfaces and the second iridium electrode head 160 on the corresponding side electrode 150.

[0030] Due to the precise 1.5mm discharge gap and coaxial mounting design, the high-voltage current will choose the path of least impedance to simultaneously establish an electric field between the two pairs of electrodes. When the electric field strength exceeds the dielectric strength of air, an arc discharge will preferentially occur between one set of electrodes.

[0031] During the discharge process, the 60-degree inclined structure causes the electric arc to expand along a radial path, forming a three-dimensional fire core, while the electrode guard ring 170 guides the flame to propagate towards the center of the combustion chamber. The 120-degree bent side electrode 150 structure effectively disperses the heat flow. Combined with the high-temperature stability of the iridium material, it ensures that the electrode shape can still be maintained under continuous high current (25A). The entire ignition process is completed within 0.3ms. The generated 260mJ high-energy spark can penetrate the dense mixture in the cylinder with a high compression ratio (>12:1) to achieve complete combustion.

[0032] In summary, the innovative dual-discharge channel design achieves a breakthrough in ignition performance. The 60-degree inclined structure of the central electrode 130 and the 120-degree bent structure of the side electrode 150 form two pairs of parallel discharge gaps (1.5mm). Combined with the high melting point characteristics of the first iridium electrode head 140 and the second iridium electrode head 160, the product has three core advantages: First, the dual-channel discharge design ensures that at least one effective spark is generated in each ignition cycle, improving the ignition success rate and meeting the high-energy ignition requirements of 50kV / 25A / 260mJ; Second, the optimized 60-degree discharge plane increases the flame propagation speed by 35%, and the >3mm fireball core area formed by the 1.5mm increased gap can stably ignite lean mixtures with an air-fuel ratio >20:1 and alternative fuels such as hydrogen; Finally, the synergistic effect of the electrode guard ring 170 and the 120-degree bent structure reduces heat conduction loss by 17%, lowers the operating temperature by 80-120℃, extends the service life to 100,000 kilometers, and reduces HC emissions by 25%.

[0033] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0034] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0035] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A spark plug that matches an ignition coil with high energy, high voltage, and high current, characterized in that: It includes a threaded sleeve (110), a ceramic tube (120) fixedly installed on the outside of the threaded sleeve (110), a center electrode (130) fixedly installed on the outside of the ceramic tube (120), and a first iridium electrode head (140) fixedly installed on the inclined surface of the center electrode (130). It also includes a side electrode (150) fixedly installed on the outside of the ceramic tube (120), a second iridium electrode head (160) fixedly installed on the side electrode (150) at a position corresponding to the first iridium electrode head (140) of the center electrode (130), an electrode guard ring (170) fixedly installed on the outside of the threaded sleeve (110), a hexagonal spiral (180) fixedly installed on the outside of one end of the threaded sleeve (110), and an insulator (190) fixedly installed on the end of the threaded sleeve (110). The end of the center electrode (130) is processed into an equilateral triangular bevel structure with the two bevel planes forming a 60-degree angle to enhance flame propagation efficiency. The side electrode (150) is a bent structure, and the bevel at the bend is at the same angle as the bevel at the end of the center electrode (130), and the bend angle of the side electrode is 120 degrees.

2. The spark plug according to claim 1, which is matched with an ignition coil of high energy, high voltage, and high current, is characterized in that: The bending structure of the side electrode (150) enables the second iridium electrode head (160) and the first iridium electrode head (140) to form an optimized discharge gap.

3. The spark plug according to claim 2, which is matched with an ignition coil of high energy, high voltage, and high current, is characterized in that: The second iridium electrode head (160) is coaxially mounted with the first iridium electrode head (140).

4. The spark plug according to claim 3, which is matched with an ignition coil of high energy, high voltage, and high current, is characterized in that: The distance between the end faces of the first iridium electrode head (140) and the second iridium electrode head (160) is 1.5 mm, which can simultaneously form two pairs of positive and negative electrodes for discharge.

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