A spark plug

Abstract

This utility model provides a spark plug, including a spark plug body and a pre-ignition seat. The spark plug body has a positive ignition electrode at its bottom and a coupling part I on its inner bottom wall. The pre-ignition seat has a flange in the middle and an air inlet at its bottom. The two sides of the flange are a coupling part II and a flame-spraying part, respectively. The flange has an ignition hole with a negative ignition electrode inside. The spark plug body and the pre-ignition seat are fixed by a threaded connection through the coupling part I and the coupling part II. The flame-spraying part has several flame-spraying holes, which can effectively improve the heat dissipation efficiency of the pre-ignition seat, improve the high temperature resistance and service life of the spark plug. At the same time, the threaded connection and spot welding fixation between the spark plug body and the pre-ignition seat make the fixation more secure.

Description

Technical Field

[0001] This utility model relates to a spark plug. Background Technology

[0002] Spark plugs are crucial components of a gasoline engine's ignition system. They introduce high-voltage electricity into the combustion chamber, causing it to jump across the electrode gap and generate a spark, thus igniting the combustible mixture in the cylinder. With conventional spark plugs, the electrodes are exposed on the outside of the plug. In lean combustion conditions, the mixture is difficult to burn reliably and quickly, potentially leading to misfires, knocking, or incomplete combustion. A type of spark plug on the market features a pre-combustion chamber. Its structure adds a pre-combustion chamber with an orifice to the end of the traditional spark plug. The spark generated by the spark plug first ignites the rich mixture in the pre-combustion chamber. The resulting high-temperature, high-pressure flame is then injected into the main combustion chamber as a turbulent jet through the orifice, achieving multi-point ignition and significantly improving the stability and combustion speed of lean combustion.

[0003] Currently, the pre-combustion chamber of most spark plugs with pre-combustion chambers is directly welded to the spark plug shell. While this one-piece welded structure is robust, it also has significant drawbacks: the pre-combustion chamber withstands extremely high temperatures during operation, and the welded structure hinders efficient heat conduction. This results in the heat from the pre-combustion chamber and the spark plug's center electrode being difficult to dissipate to the cylinder head through the metal shell in a timely manner, causing excessive heat load and severely affecting the spark plug's high-temperature resistance and service life. Utility Model Content

[0004] In view of the defects of existing spark plugs, the technical problem to be solved by this utility model is to provide a spark plug that can effectively improve the heat dissipation efficiency of the pre-ignition seat, improve the high temperature resistance and service life of the spark plug.

[0005] To achieve the above objectives, according to one aspect of the present invention, the present invention is implemented through the following technical measures: It includes a spark plug body and a pre-ignition seat. The spark plug body has a positive ignition electrode at its bottom and a coupling part I on its inner bottom wall. The pre-ignition seat has a flange in the middle and an air inlet at its bottom. The two sides of the flange are a coupling part II and a flame-spraying part, respectively. The flange has an ignition hole, and the ignition hole contains a negative ignition electrode. The spark plug body and the pre-ignition seat are fixedly connected by the coupling part I and the coupling part II via threads. The flame-spraying part has several flame-spraying holes, and the coupling part II has an exhaust hole that axially penetrates the coupling part II and the flange.

[0006] Furthermore, the spark plug body and the pre-ignition seat are connected by threads and then spot-welded at the contact point of their outer walls.

[0007] Compared with the prior art, the advantages of this utility model are as follows: This spark plug can effectively improve the heat dissipation efficiency of the pre-ignition seat, improve the high temperature resistance and service life of the spark plug, and at the same time, the threaded connection and spot welding fixation between the spark plug body and the pre-ignition seat make the two more securely fixed. Attached Figure Description

[0008] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the structure of a spark plug according to the present invention.

[0009] Explanation of reference numerals in the attached drawings: 1. Spark plug body; 2. Pre-ignition seat; 3. Positive ignition electrode; 4. Coupling part I; 5. Air inlet; 6. Flange; 7. Flame jet; 8. Coupling part II; 9. Ignition hole; 10. Negative ignition electrode; 11. Flame jet; 12. Exhaust hole. Detailed Implementation

[0010] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0011] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "bottom", "top", etc., 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.

[0012] Please refer to Figure 1This embodiment provides a spark plug including a spark plug body 1 and a pre-ignition seat 2. The spark plug body 1 has a positive ignition electrode 3 at its bottom and a coupling part I4 on its inner bottom wall, which is internally threaded. The pre-ignition seat 2 has an air inlet 5 at its bottom and a flange 6 in the middle. One side of the flange 6 is a flame-spraying part 7, and a ignition hole 9 is opened on the flange 6. The ignition hole 9 has a negative ignition electrode 10, which is opposite to the positive ignition electrode 3. The flame-spraying part 7 has several flame-spraying holes 11. The other side of the flange 6 is a coupling part II8, and the coupling part II8 has an exhaust hole 12 that axially penetrates the coupling part II8 and the flange 6. The coupling part II8 is externally threaded. The spark plug body 1 and the pre-ignition seat 2 are connected by threads through the coupling part I4 and the coupling part II8 and then spot-welded at the contact point of their outer walls. The threaded connection increases the contact area between the spark plug body 1 and the pre-ignition seat 2, which facilitates the rapid transfer of heat from the pre-ignition seat 2 to the outside of the spark plug and improves the heat dissipation efficiency.

[0013] The spark plug provided in this embodiment allows the combustible mixture in the combustion chamber to enter the pre-combustion seat 2 through the air inlet 5. The spark plug ignites the combustible mixture in the pre-combustion seat 2 by generating an electric spark through the high voltage of the positive and negative electrodes. The mixture is then ejected into the combustion chamber through the flame nozzle 11. Excess exhaust gas returns to the combustion chamber through the exhaust port 12. When the exhaust gas passes through the exhaust port 12, it can accelerate the heat dissipation between the pre-combustion seat 2 and the spark plug body 1.

[0014] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various changes and modifications can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A spark plug, characterized in that: A spark plug includes a spark plug body (1) and a pre-ignition seat (2). The spark plug body (1) has a positive ignition electrode (3) at the bottom and a coupling part I (4) on the inner wall of the bottom. The pre-ignition seat (2) has a flange (6) in the middle and an air inlet (5) at the bottom. The two sides of the flange (6) are a coupling part II (8) and a flame-spraying part (7) respectively. The flange (6) has an ignition hole (9) and an ignition negative electrode (10) in the ignition hole (9). The spark plug body (1) and the pre-ignition seat (2) are fixed by a threaded connection through the coupling part I (4) and the coupling part II (8). The flame-spraying part (7) has a plurality of flame-spraying holes (11). The coupling part II (8) has an exhaust hole (12) that axially penetrates the coupling part II (8) and the flange (6).

2. The spark plug according to claim 1, characterized in that: The spark plug body (1) and the pre-ignition seat (2) are connected by threads and then spot-welded at the contact point of their outer walls.

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