Spark plug capable of spreading flame rapidly

Abstract

The utility model discloses a spark plug capable of rapidly spreading flame, which comprises a central electrode, a side electrode, a power connection electrode and an insulator made of high alumina ceramic material, the insulator is provided with a mounting hole channel, and a resistor is connected between the central electrode and the power connection electrode in the mounting hole channel. A first elastic conductive piece is arranged between one end of the resistor and the central electrode, and a second elastic conductive piece is arranged between the other end of the resistor and the power connection electrode; the side electrode comprises a metal shell and a conductive connecting part arranged on the metal shell in an extending manner, the end part of the conductive connecting part is electrically connected with a conductive cover, the central electrode comprises a discharge end part close to one side of the conductive cover, one end, facing the discharge end part, of the conductive cover is provided with a hemispherical arc-shaped surface, and an air passage gap is reserved between the discharge end part and the conductive cover; and the distance between the discharge end part and any site on the inner wall of the hemispherical arc-shaped surface of the conductive cover is equal. The spark plug has the effects of effectively improving the vehicle ignition probability, achieving the purpose of flame speed propagation and prolonging the service life of the spark plug.

Description

Technical Field

[0001] The utility model relates to the technical field of spark plugs, in particular to a spark plug with rapidly propagating flame. Background Art

[0002] A spark plug is a component in a gasoline engine ignition system that introduces high-voltage current into the cylinder to generate an electric spark to ignite the combustible mixture. Spark plugs are generally installed in the combustion chamber of an internal combustion engine such as an engine to ignite the mixture supplied to the combustion chamber. The spark plug has a center electrode and side electrodes arranged relative to each other to form a spark gap, thereby generating a spark discharge in the spark gap by applying a high voltage between the two electrodes.

[0003] However, the existing spark plugs all extend a conductive connection at the end through the side electrode, and use the spark gap between the conductive connection and the center electrode to generate an electric spark that breaks through the fuel gas. However, when the engine combustion chamber burns, carbon deposits will be generated on the surface of the conductive connection. The conductive connection of the side electrode on the market is usually thinner in diameter. After being used for a period of time, carbon deposits will adhere to the surface of the conductive connection, which will reduce the ignition efficiency between the conductive connection of the center electrode and the side electrode, making it difficult to start the vehicle. This situation needs to be improved urgently. Utility Model Content

[0004] The utility model aims to provide a spark plug with fast flame propagation, which has the effects of effectively improving the ignition probability of a vehicle, achieving the purpose of fast flame propagation, and extending the service life of the spark plug.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A spark plug with a fast flame propagation, comprising a center electrode, a side electrode, a power electrode, and an insulator made of a high-alumina ceramic material, wherein the insulator is provided with a mounting hole extending axially therethrough, the center electrode and the power electrode being correspondingly arranged at both ends of the mounting hole, a resistor being connected between the center electrode and the power electrode in the mounting hole, a first elastic conductive member being provided between one end of the resistor and the center electrode, and a second elastic conductive member being provided between the other end of the resistor and the power electrode;

[0006] The side electrode includes a metal shell and a conductive connecting portion extending from the metal shell. A sealing gasket is provided on the outside of the metal shell. The end of the conductive connecting portion is electrically connected to a conductive cover. The center electrode includes a discharge end close to one side of the conductive cover. The conductive cover has a hemispherical arc surface at one end facing the discharge end. An airway gap is left between the discharge end and the conductive cover, and the distance between the discharge end and any point on the inner wall of the hemispherical arc surface of the conductive cover is equal.

[0007] By adopting the above technical solution, the provision of a sealing gasket can improve the installation seal between the spark plug and the vehicle engine. The first elastic conductive member and the second elastic conductive member are used to elastically electrically connect the two ends of the resistor to the center electrode and the contact electrode, respectively, which can effectively reduce shock for the resistor and prevent damage caused by hard contact between the upper and lower ends of the resistor and the center electrode and the contact electrode when the vehicle is running on bumpy roads. In addition, by providing a conductive shield on the conductive connection portion of the side electrode aligned with the center electrode, the spacing between the center electrode and any point on the hemispherical arc surface of the conductive shield is consistent, which can increase the area of ​​the side electrode, thereby effectively increasing the probability of generating an electric spark between the discharge end of the center electrode and the conductive shield, thereby reducing the occurrence of vehicle ignition starting failures. In addition, compared with the method without a conductive shield on the market, the present invention increases the receiving area of ​​the side electrode end for the ionization spark by electrically connecting the conductive shield to the end of the side electrode. The conductive shield can reduce the carbon deposit coverage on the conductive shield within the same time, thereby reducing the replacement frequency of the spark plug, effectively improving the vehicle ignition probability and extending the service life of the spark plug.

[0008] The utility model is further configured as follows: the conductive cover includes a cover body and a plug-in portion integrally provided on the back of the cover body; the conductive connecting portion is provided with a plug-in hole corresponding to the conductive cover; the plug-in portion is plugged into and matched with the plug-in hole.

[0009] By adopting the above technical solution, the conductive cover can be detachably mounted on the conductive connecting portion of the side electrode, making it convenient to subsequently replace the conductive cover that is full of carbon deposits.

[0010] The present invention is further configured as follows: the plug-in portion is provided with a plurality of pins along the circumferential direction; the conductive connection portion is provided with positioning grooves corresponding to the pins; and the plurality of pins can be bent relative to the plug-in portion and positioned and matched with the corresponding positioning grooves.

[0011] By adopting the above technical solution, the conductive cover can be more firmly connected to the conductive connecting portion of the side electrode.

[0012] The present invention is further configured as follows: a plurality of the pins are fixedly connected in the corresponding positioning grooves by welding.

[0013] By adopting the above technical solution, the electrical connection between the pins of the conductive cover and the conductive connecting portion is made more secure, thereby improving the anti-shake performance between the conductive cover and the side electrode.

[0014] The present invention is further configured as follows: an air flow channel is provided through the middle of the cover body.

[0015] By adopting the above technical solution, the gas in the engine cylinder can enter the gas channel gap through the air flow channel and be broken down and burned by the electric spark generated between the center electrode and the center electrode.

[0016] The present invention is further configured as follows: the discharge end is configured in a cone shape, and the diameter of the discharge end gradually increases from an end close to the conductive cover toward an end away from the conductive cover.

[0017] The present invention is further configured such that a heat dissipation space is left between an end of the insulator close to the discharge end and the metal shell.

[0018] By adopting the above technical solution, the provision of the heat dissipation space can increase the heat dissipation efficiency of the insulator.

[0019] The present invention is further configured as follows: the outer wall of the insulator is provided with a plurality of layers of heat dissipation skirts extending toward the heat dissipation space.

[0020] By adopting the above technical solution, the heat dissipation skirt can increase the heat dissipation area of ​​the insulator and improve the heat dissipation efficiency of the insulator.

[0021] The present invention is further configured as follows: the insulator is provided with a plurality of heat dissipation fins from top to bottom around the resistor.

[0022] By adopting the above technical solution, the heat dissipation fin portion can increase the heat conduction area of ​​the insulator and improve the heat dissipation efficiency of the utility model.

[0023] The present invention is further configured as follows: a first plug-in post is integrally provided at the first end of the resistor, a first slot is provided at the center electrode corresponding to the first plug-in post, and the first plug-in post is plugged and guided into the first slot; a second plug-in post is integrally provided at the second end of the resistor, a second slot is provided at the power electrode corresponding to the second plug-in post, and the second plug-in post is plugged and guided into the second slot.

[0024] By adopting the above technical solution, the installation concentricity between the two ends of the resistor and the central electrode and the power electrode can be improved, so that the resistor, the central electrode and the power electrode can be installed more properly in the installation channel of the insulator.

[0025] In summary, the present invention has the following beneficial effects:

[0026] The central electrode and the power electrode are installed at both ends of the mounting hole in the middle of the insulator of the spark plug. A resistor is connected between the central electrode and the power electrode in the mounting hole. A first elastic conductive member is provided between one end of the resistor and the central electrode, and a second elastic conductive member is provided between the other end of the resistor and the power electrode. In addition, the end of the conductive connection portion of the side electrode is electrically connected to the conductive cover. A hemispherical arc surface is provided at one end of the conductive cover facing the discharge end of the central electrode. An airway gap is left between the discharge end and the conductive cover, and the distance between the discharge end and any point on the inner wall of the hemispherical arc surface of the conductive cover is equal to etc., to increase the area of ​​the side electrode, thereby effectively increasing the probability of generating electric sparks between the discharge end of the center electrode and the conductive cover, thereby reducing the situation of vehicle ignition and starting failure. In addition, compared with the method of not setting a conductive cover on the market, the utility model increases the receiving area of ​​the side electrode end for the ionization spark by electrically connecting the conductive cover at the end of the side electrode, and can reduce the carbon deposit coverage rate on the conductive cover within the same time, thereby reducing the replacement frequency of the spark plug, which has the effect of effectively improving the ignition probability of the vehicle to achieve the purpose of rapid flame propagation and extend the service life of the spark plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of a specific embodiment of the present utility model.

[0028] Figure 2 It is a top view of the first specific embodiment of the present utility model.

[0029] Figure 3 This utility model Figure 2 Cross-sectional view of section AA.

[0030] Figure 4 This utility model Figure 3 A partial enlarged view of area B in the middle.

[0031] Figure 5 This utility model Figure 3 A partial enlarged view of the middle C area.

[0032] Figure 6 This is a view showing the conductive cover and the conductive connecting portion separated from each other in the first embodiment of the present invention.

[0033] Figure 7 It is a structural diagram of the conductive cover of the first specific embodiment of the present utility model.

[0034] Figure 8 It is a longitudinal cross-sectional view of the conductive cover of the first specific embodiment of the present utility model.

[0035] Figure 9 It is a structural diagram of the conductive cover of the second specific embodiment of the present utility model.

[0036] Figure 10 It is a longitudinal cross-sectional view of the conductive cover of the second specific embodiment of the present utility model.

[0037] In the figure: 1. Center electrode; 1a. First slot; 11. Discharge end; 11a. Airway gap; 2. Side electrode; 21. Metal shell; 21a. Heat dissipation space; 22. Conductive connection part; 22a. Plug hole; 22b. Positioning groove; 3. Power electrode; 3a. Second slot; 4. Insulator; 4a. Mounting channel; 41. Heat dissipation skirt; 42. Heat dissipation fin part; 5. Resistor; 501. First plug post; 502. Second plug post; 51. First elastic conductive part; 52. Second elastic conductive part; 6. Conductive cover; 6a. Hemispherical arc surface; 61. Cover body; 61a. Airflow channel; 62. Plug part; 621. Pin; 7. Sealing gasket. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings. Specific embodiment 1

[0040] A spark plug with a very fast flame propagation, such as Figure 1-5 As shown, it includes a central electrode 1, a side electrode 2, a power electrode 3 and an insulator 4 made of high alumina ceramic material. The insulator 4 is provided with a mounting hole 4a along the axial direction. The central electrode 1 and the power electrode 3 are correspondingly arranged at the two ends of the mounting hole 4a. A resistor 5 is connected between the central electrode 1 and the power electrode 3 in the mounting hole 4a. A first elastic conductive member 51 is provided between one end of the resistor 5 and the central electrode 1, and a second elastic conductive member 52 is provided between the other end of the resistor 5 and the power electrode 3; the side electrode 2 includes A metal shell 21 and a conductive connecting portion 22 extending from the metal shell 21, a sealing gasket 7 is provided on the outside of the metal shell 21, the end of the conductive connecting portion 22 is electrically connected to the conductive cover 6, the central electrode 1 includes a discharge end 11 close to the side of the conductive cover 6, and the conductive cover 6 has a hemispherical arc surface 6a on one end facing the discharge end 11, an airway gap 11a is left between the discharge end 11 and the conductive cover 6, and the distance between the discharge end 11 and any point on the inner wall of the hemispherical arc surface 6a of the conductive cover 6 is equal.

[0041] like Figure 4 and Figure 6-8As shown, the conductive cover 6 includes a cover body 61 and a plug-in portion 62 integrally provided on the back of the cover body 61. The conductive connecting portion 22 is provided with a plug-in hole 22a corresponding to the conductive cover 6. The plug-in portion 62 is plugged into the plug-in hole 22a, so that the conductive cover 6 can be detachably installed on the conductive connecting portion 22 of the side electrode 2, which is convenient for the subsequent replacement of the conductive cover 6 that is full of carbon deposits; the plug-in portion 62 is provided with a plurality of pins 621 along the circumferential direction, and the conductive connecting portion 22 is provided with a positioning groove 22b corresponding to the pin 621. The plurality of pins 621 can be bent relative to the plug-in portion 62 and positioned and matched with the corresponding positioning groove 22b, so that the conductive cover 6 can be more firmly connected to the conductive connecting portion 22 of the side electrode 2; the plurality of pins 621 are connected to the conductive connecting portion 22 of the side electrode 2. It is fixedly connected to the corresponding positioning groove 22b by welding, so that the electrical connection between the pin 621 of the conductive cover 6 and the conductive connecting part 22 is more secure, and the anti-shake performance between the conductive cover 6 and the side electrode 2 is improved; the discharge end 11 is arranged in a cone, and the diameter of the discharge end 11 gradually increases from the end close to the conductive cover 6 to the end away from the conductive cover 6; a heat dissipation space 21a is left between the end of the insulator 4 close to the discharge end 11 and the metal shell 21, and the setting of the heat dissipation space 21a can increase the heat dissipation efficiency of the insulator 4; the outer wall of the insulator 4 is extended toward the heat dissipation space 21a with several layers of heat dissipation skirts 41, and the heat dissipation skirts 41 can increase the heat dissipation area of ​​the insulator 4 and improve the heat dissipation efficiency of the insulator 4.

[0042] like Figure 5 As shown, the insulator 4 is provided with a plurality of heat dissipation fin portions 42 from top to bottom around the resistor 5. The heat dissipation fin portions 42 can increase the heat conduction area of ​​the insulator 4 and improve the heat dissipation efficiency of the present invention; the first end of the resistor 5 is integrally provided with a first pin 501, and the center electrode 1 is provided with a first slot 1a corresponding to the first pin 501, and the first pin 501 is plugged and guided into the first slot 1a; the second end of the resistor 5 is integrally provided with a second pin 502, and the power electrode 3 is provided with a second slot 3a corresponding to the second pin 502, and the second pin 502 is plugged and guided into the second slot 3a, which can improve the installation concentricity between the two ends of the resistor 5 and the center electrode 1 and the power electrode 3, so that the resistor 5, the center electrode 1 and the power electrode 3 are more properly installed in the installation channel 4a of the insulator 4.

[0043] The basic working principle of the present invention is as follows: a central electrode 1 and a power electrode 3 are installed at both ends of a mounting hole 4a in the middle of an insulator 4 of a spark plug; a resistor 5 is connected between the central electrode 1 and the power electrode 3 in the mounting hole 4a; a first elastic conductive member 51 is provided between one end of the resistor 5 and the central electrode 1; a second elastic conductive member 52 is provided between the other end of the resistor 5 and the power electrode 3; wherein the side electrode 2 includes a metal shell 21 and a conductive connecting portion 22 extending from the metal shell 21; a sealing member is provided outside the metal shell 21; The gasket 7 is provided. In addition, the end of the conductive connection portion 22 of the side electrode 2 is electrically connected to the conductive cover 6. A hemispherical arc surface 6a is provided at one end of the conductive cover 6 facing the discharge end 11 of the center electrode 1. An air passage gap 11a is left between the discharge end 11 and the conductive cover 6. The distance between the discharge end 11 and any point on the inner wall of the hemispherical arc surface 6a of the conductive cover 6 is equal. The setting of the sealing gasket 7 can improve the installation sealing between the spark plug and the vehicle engine. The first elastic conductive member 51 and the second elastic conductive member 52 are used to connect the electric The two ends of the resistor 5 are elastically electrically connected to the central electrode 1 and the power receiving electrode 3 respectively, which can effectively reduce the shock of the resistor 5 and prevent damage caused by hard contact between the upper and lower ends of the resistor 5 and the central electrode 1 and the power receiving electrode 3 when the vehicle runs on bumpy roads. In addition, by aligning the central electrode 1 with the conductive cover 6 on the conductive connecting part 22 of the side electrode 2, the distance between the central electrode 1 and any point on the hemispherical arc surface 6a of the conductive cover 6 is kept consistent, which can increase the area of ​​the side electrode 2, thereby effectively increasing the probability of generating electric sparks between the discharge end 11 of the central electrode 1 and the conductive cover 6, thereby reducing the failure of vehicle ignition to start. In addition, compared with the method in the market where no conductive cover 6 is set, the utility model increases the receiving area of ​​the end of the side electrode 2 for the ionization spark by electrically connecting the conductive cover 6 at the end of the side electrode 2, and can reduce the carbon deposit coverage rate on the conductive cover 6 in the same time, thereby reducing the replacement frequency of the spark plug, which has the effect of effectively improving the ignition probability of the vehicle to achieve the purpose of rapid flame propagation and extend the service life of the spark plug. Specific embodiment 2

[0045] A spark plug with a very fast flame propagation, such as Figure 9-10 As shown, the difference between this embodiment and the specific embodiment 1 is that an air flow channel 61a is opened through the middle of the cover body 61. The opening of the air flow channel 61a allows the combustion gas in the engine cylinder to enter the air channel gap 11a through the air flow channel 61a and be broken down and burned by the electric spark generated between the center electrode 1 and the center electrode 1.

[0046] The other structures of this embodiment are the same as those of the first embodiment and will not be described again here.

[0047] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. A spark plug with rapid flame propagation, characterized in that: The invention comprises a central electrode (1), a side electrode (2), a power electrode (3), and an insulator (4) made of a high-alumina ceramic material, wherein the insulator (4) is provided with a mounting hole (4a) extending through the insulator (4) in the axial direction, the central electrode (1) and the power electrode (3) are correspondingly arranged at the two ends of the mounting hole (4a), a resistor (5) is connected between the central electrode (1) and the power electrode (3) in the mounting hole (4a), a first elastic conductive member (51) is provided between one end of the resistor (5) and the central electrode (1), and a second elastic conductive member (52) is provided between the other end of the resistor (5) and the power electrode (3); The side electrode (2) comprises a metal shell (21) and a conductive connecting portion (22) extending from the metal shell (21); a sealing gasket (7) is provided on the outside of the metal shell (21); an end of the conductive connecting portion (22) is electrically connected to a conductive cover (6); the central electrode (1) comprises a discharge end (11) close to one side of the conductive cover (6); a hemispherical arc surface (6a) is provided on one end of the conductive cover (6) facing the discharge end (11); an airway gap (11a) is left between the discharge end (11) and the conductive cover (6); and the distance between the discharge end (11) and any point on the inner wall of the hemispherical arc surface (6a) of the conductive cover (6) is equal.

2. The spark plug with rapid flame propagation according to claim 1, characterized in that: The conductive cover (6) comprises a cover body (61) and an inserting portion (62) integrally provided on the back of the cover body (61); the conductive connecting portion (22) is provided with an inserting hole (22a) corresponding to the conductive cover (6); and the inserting portion (62) is plugged into and matched with the inserting hole (22a).

3. The spark plug with rapid flame propagation according to claim 2, characterized in that: The plug-in portion (62) is provided with a plurality of pins (621) along the circumferential direction, and the conductive connecting portion (22) is provided with positioning grooves (22b) corresponding to the pins (621). The plurality of pins (621) can be bent relative to the plug-in portion (62) and positioned in cooperation with the corresponding positioning grooves (22b).

4. The spark plug with rapid flame propagation according to claim 3, characterized in that: A plurality of the pins (621) are fixedly connected in the corresponding positioning grooves (22b) by welding.

5. The spark plug with rapid flame propagation according to claim 2, characterized in that: An air flow channel (61a) is provided through the middle of the cover body (61).

6. The spark plug with rapid flame propagation according to claim 1, characterized in that: The discharge end (11) is arranged in a cone shape, and the diameter of the discharge end (11) gradually increases from an end close to the conductive cover (6) toward an end away from the conductive cover (6).

7. The spark plug with rapid flame propagation according to claim 1, characterized in that: A heat dissipation space (21a) is left between one end of the insulator (4) close to the discharge end (11) and the metal shell (21).

8. The spark plug with rapid flame propagation according to claim 7, characterized in that: The outer wall of the insulator (4) is extended toward the heat dissipation space (21a) and is provided with several layers of heat dissipation skirts (41).

9. The spark plug with rapid flame propagation according to claim 1, characterized in that: The insulator (4) is provided with a plurality of heat dissipation fins (42) around the resistor (5) from top to bottom.

10. The spark plug with rapid flame propagation according to claim 1, characterized in that: The first end of the resistor (5) is integrally provided with a first plug post (501), the central electrode (1) is provided with a first slot (1a) corresponding to the first plug post (501), and the first plug post (501) and the first slot (1a) are plugged and guided together; the second end of the resistor (5) is integrally provided with a second plug post (502), the power electrode (3) is provided with a second slot (3a) corresponding to the second plug post (502), and the second plug post (502) and the second slot (3a) are plugged and guided together.

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