Spark plug and internal combustion engine

Abstract

The utility model discloses a spark plug and an internal combustion engine, and belongs to the technical field of spark plugs. The spark plug comprises a shell, a pipe assembly and an electrode assembly. The shell is provided with an accommodating cavity; the pipeline assembly comprises an air inlet pipe and an air outlet pipe. The containing cavity communicates with the air inlet pipe and the air outlet pipe. The electrode assembly is arranged in the containing cavity and comprises a first electrode and a second electrode, a through hole is formed in the second electrode, an internal thread is arranged on the hole wall of the through hole, the first electrode penetrates through the through hole, an external thread is arranged on the circumferential wall of the first electrode, and the rotating direction of the external thread is opposite to that of the internal thread; or, the hole wall of the through hole is provided with a plurality of convex parts which are arranged in an array, and the first electrode is arranged in the through hole in a penetrating manner. According to the spark plug provided by the invention, the number of the discharge points is multiplied, so that the probability of failure of the ignition function of the spark plug is reduced, the service life of the spark plug is prolonged, and the maintenance or replacement cost of the spark plug is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spark plug, in particular to a spark plug and an internal combustion engine. BACKGROUND

[0002] The spark plug is an important element of the ignition system of the internal combustion engine, which functions to emit the pulse high-voltage electricity from the high-voltage lead, break the air between the two electrodes of the spark plug, and generate the electric spark to ignite the mixed gas in the cylinder.

[0003] In the prior art, the discharge nozzle of the spark plug is seriously worn out by the continuous arc during the operation, and the discharge nozzle is usually within four discharge points, which results in a short service life of the spark plug and increases the cost of maintenance or replacement of the spark plug. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the purpose of the present application is to overcome the deficiencies in the prior art and provide a spark plug.

[0005] To solve the above technical problems, the present application provides:

[0006] A spark plug comprises:

[0007] a shell having a receiving cavity;

[0008] a pipeline assembly comprising an air inlet pipe and an air outlet pipe, the receiving cavity being in communication with the air inlet pipe and the air outlet pipe respectively;

[0009] an electrode assembly arranged in the receiving cavity, the electrode assembly comprising a first electrode and a second electrode, the second electrode being provided with a through hole, the hole wall of the through hole being provided with an internal thread, the first electrode being arranged in the through hole, and the circumferential wall of the first electrode being provided with an external thread, the rotation direction of the external thread being opposite to that of the internal thread;

[0010] Alternatively, the hole wall of the through hole is provided with a plurality of protrusions arranged in an array, and the first electrode is arranged in the through hole.

[0011] In addition, the spark plug according to the present application can also have the following additional technical features:

[0012] In some embodiments of the present application, the external thread and the internal thread have a spacing therebetween.

[0013] In some embodiments of the present application, the length of the external thread is greater than the length of the internal thread in the axial direction of the electrode assembly.

[0014] In some embodiments of the present application, the rotation direction of the internal thread is right-handed, and the rotation direction of the external thread is left-handed.

[0015] or the internal thread is left-handed and the external thread is right-handed.

[0016] In some embodiments of the present application, the spark plug further comprises a first insulating fixing member, the first insulating fixing member is arranged in the accommodating cavity, and the first electrode is connected to the first insulating fixing member at an end away from the second electrode.

[0017] In some embodiments of the present application, the spark plug further comprises a conductive member, the first insulating fixing member is provided with a mounting hole, and the conductive member is arranged in the mounting hole and electrically connected to the first electrode.

[0018] In some embodiments of the present application, the spark plug further comprises a first cover, one end of the shell is provided with a first opening communicating with the accommodating cavity, the first cover is arranged on the first opening, and an end of the first insulating fixing member away from the first electrode abuts against the first cover.

[0019] In some embodiments of the present application, the spark plug further comprises a second insulating fixing member, the second insulating fixing member is arranged in the accommodating cavity, and the second electrode is connected to the second insulating fixing member at an end away from the first electrode.

[0020] In some embodiments of the present application, the spark plug further comprises a second cover and an ultrasonic assembly, an end of the shell away from the first opening is provided with a second opening communicating with the accommodating cavity, the second cover is arranged on the second opening, one end of the ultrasonic assembly is arranged on the second cover, and the other end of the ultrasonic assembly is arranged in the second cover, the accommodating cavity, the second insulating fixing member and abuts against the first electrode in sequence.

[0021] In the second aspect, the present application further provides an internal combustion engine comprising the spark plug in any of the above embodiments.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] The present application provides a spark plug, by arranging the accommodating cavity of the shell to communicate with the air inlet pipe and the air outlet pipe, so that the accommodating cavity has combustible gas, when the electrode assembly arranged in the accommodating cavity is struck by pulse high voltage to break through the air between the two electrodes, the electric spark generated can ignite the combustible gas in the accommodating cavity, so as to realize the ignition function of the spark plug.

[0024] The second electrode is provided with a through hole, and the first electrode is arranged in the through hole. By arranging internal threads and external threads on the hole wall of the through hole and the circumferential wall of the first electrode respectively, and arranging the external threads and the internal threads in opposite directions, the projections of the helical lines of the external threads and the internal threads in the radial direction of the electrode assembly have several intersection points, so that the electrode assembly has several discharge points, the number of discharge points is doubled, the probability of failure of the ignition function of the spark plug is reduced, the service life of the spark plug is prolonged, and the cost of maintenance or replacement of the spark plug is reduced.

[0025] Alternatively, the second electrode is provided with a through hole, and the first electrode is arranged in the through hole. By arranging a plurality of protrusions arranged in an array on the hole wall of the through hole, the electrode assembly has several discharge points, the number of discharge points is doubled, the probability of failure of the ignition function of the spark plug is reduced, the service life of the spark plug is prolonged, and the cost of maintenance or replacement of the spark plug is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 A perspective view of a spark plug in some embodiments of the present application is shown;

[0028] Figure 2 A cross-sectional view of a spark plug in some embodiments of the present application is shown;

[0029] Figure 3 A perspective view of an electrode assembly in some embodiments of the present application is shown Figure 1 ;

[0030] Figure 4 An exploded view of an electrode assembly in some embodiments of the present application is shown Figure 1 ;

[0031] Figure 5 A perspective view of an electrode assembly in some embodiments of the present application is shown Figure 2 ;

[0032] Figure 6 An exploded view of an electrode assembly in some embodiments of the present application is shown Figure 2 .

[0033] Main element symbol explanation:

[0034] 100 - spark plug;

[0035] 110 - housing; 111 - accommodating cavity; 112 - first opening; 113 - second opening;

[0036] 120 - pipe assembly; 121 - air inlet pipe; 122 - air outlet pipe;

[0037] 130 - electrode assembly; 131 - first electrode; 1311 - external thread; 132 - second electrode; 1321 - through hole; 13211 - internal thread; 13212 - protrusion;

[0038] 140 - first insulating fixing member; 141 - mounting hole;

[0039] 150 - electrically conductive member;

[0040] 160 - first cover body;

[0041] 170 - second insulating fixing member;

[0042] 180 - second cover body;

[0043] 190 - ultrasonic assembly. DETAILED DESCRIPTION

[0044] Embodiments of the present application are described below in detail with reference to the accompanying drawings, in which like or similar elements are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below are examples for explaining the present application, and are not to be understood as limiting the present application.

[0045] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0046] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0047] In the present application, unless specifically defined and limited otherwise, the terms "mount", "connect", "connection", "fixed", and the like, should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0049] As shown in Figure 1 and Figure 2 Embodiments of the present application provide a spark plug 100, mainly applied to an internal combustion engine. The spark plug 100 comprises a shell 110, a pipe assembly 120 and an electrode assembly 130.

[0050] Referring to Figure 3 and Figure 4 , wherein the shell 110 has a receiving cavity 111, the pipe assembly 120 comprises an air inlet pipe 121 and an air outlet pipe 122, and the receiving cavity 111 communicates with the air inlet pipe 121 and the air outlet pipe 122 respectively. The electrode assembly 130 is arranged in the receiving cavity 111, the electrode assembly 130 comprises a first electrode 131 and a second electrode 132, the second electrode 132 is provided with a through hole 1321, the hole wall of the through hole 1321 is provided with an internal thread 13211, the first electrode 131 is arranged in the through hole 1321, and the circumferential wall of the first electrode 131 is provided with an external thread 1311, the rotation direction of the external thread 1311 is opposite to that of the internal thread 13211. Or, the hole wall of the through hole 1321 is provided with a plurality of protruding portions 13212 arranged in an array, and the first electrode 131 is arranged in the through hole 1321.

[0051] The spark plug 100 provided by the embodiment of the present application is characterized in that the accommodating cavity 111 of the shell 110 is communicated with the air inlet pipe 121 and the air outlet pipe 122, so that the combustible gas is contained in the accommodating cavity 111, and when the electrode assembly 130 arranged in the accommodating cavity 111 is subjected to the pulse high-voltage electric breakdown of the air between the two electrodes, the electric spark generated can ignite the combustible gas in the accommodating cavity 111, so as to realize the ignition function of the spark plug 100.

[0052] The second electrode 132 is provided with a through hole 1321, and the first electrode 131 is arranged in the through hole 1321. The inner thread 13211 is arranged on the hole wall of the through hole 1321, and the outer thread 1311 is arranged on the circumferential wall of the first electrode 131. The rotation direction of the outer thread 1311 is opposite to that of the inner thread 13211, so that the projection of the helical lines of the outer thread 1311 and the inner thread 13211 in the radial direction of the electrode assembly 130 has several intersection points, thereby increasing the number of discharge points of the electrode assembly 130, reducing the failure probability of the ignition function of the spark plug 100, prolonging the service life of the spark plug 100, and reducing the cost of repairing or replacing the spark plug 100.

[0053] Referring to Figure 5 and Figure 6 , the second electrode 132 is provided with a through hole 1321, and the first electrode 131 is arranged in the through hole 1321. The through hole 1321 is provided with a plurality of protrusions 13212 arranged in an array on the hole wall. The electrode assembly 130 has several discharge points, thereby increasing the number of discharge points, reducing the failure probability of the ignition function of the spark plug 100, prolonging the service life of the spark plug 100, and reducing the cost of repairing or replacing the spark plug 100.

[0054] For example, the first electrode 131 can be a positive electrode, the rotation direction of the outer thread 1311 is left-handed, the second electrode 132 is a negative electrode, and the rotation direction of the inner thread 13211 is right-handed.

[0055] In another embodiment, the first electrode 131 can be a negative electrode, the rotation direction of the outer thread 1311 is right-handed, the second electrode 132 is a positive electrode, and the rotation direction of the inner thread 13211 is left-handed.

[0056] In an embodiment of the present application, the outer thread 1311 and the inner thread 13211 have a spacing therebetween.

[0057] In the embodiment, the outer thread 1311 and the inner thread 13211 are arranged with a spacing therebetween, so that on one hand, the direct contact between the first electrode 131 and the second electrode 132 can be avoided to prevent short circuit, and on the other hand, the air between the two electrodes can be broken down when the electrode assembly 130 is subjected to high-voltage pulse, so that an electric spark is generated to ignite the combustible gas in the accommodating cavity 111, thereby realizing the ignition function of the spark plug 100.

[0058] In one embodiment of the present application, the length of the outer thread 1311 is greater than the length of the inner thread 13211 in the axial direction of the electrode assembly 130.

[0059] In the embodiment, the length of the outer thread 1311 is greater than the length of the inner thread 13211 in the axial direction of the electrode assembly 130, so that the number of intersection points of the projections of the helical lines of the outer thread 1311 and the inner thread 13211 in the radial direction of the electrode assembly 130 can be maximized, thereby maximizing the number of discharge points, further reducing the probability of failure of the ignition function of the spark plug 100, further prolonging the service life of the spark plug 100, and further reducing the cost of repairing or replacing the spark plug 100.

[0060] As shown in Figure 2 In any one of the above embodiments of the present application, the spark plug 100 further comprises a first insulating fixing member 140, which is arranged in the accommodating cavity 111, and the end of the first electrode 131 away from the second electrode 132 is connected to the first insulating fixing member 140.

[0061] In the embodiment, the first insulating fixing member 140 is arranged in the accommodating cavity 111, and the end of the first electrode 131 away from the second electrode 132 is connected to the first insulating fixing member 140, so that on one hand, the first electrode 131 can be stably kept at the centerline position of the accommodating cavity 111 under the fixing action of the first insulating fixing member 140, thereby keeping the first electrode 131 at the centerline position of the through hole 1321 of the second electrode 132, and further ensuring the discharge ignition function of the electrode assembly 130. On the other hand, the first electrode 131 can be insulated from other components under the insulation action of the first insulating fixing member 140 to prevent the occurrence of phenomena such as electric leakage and short circuit.

[0062] For example, the connection between the first electrode 131 and the first insulating fixing member 140 can be a threaded connection.

[0063] As shown in Figure 2As shown in the above embodiment of the present application, the spark plug 100 further comprises an electrically conductive member 150, and the first insulating fixing member 140 is provided with a mounting hole 141, and the electrically conductive member 150 is arranged in the mounting hole 141 and electrically connected with the first electrode 131.

[0064] In the embodiment, the mounting hole 141 is arranged on the first insulating fixing member 140, and the electrically conductive member 150 is arranged in the mounting hole 141 and electrically connected with the first electrode 131, so that the external power supply provides pulse high voltage to the first electrode 131 through the electrically conductive member 150.

[0065] For example, the electrically conductive member 150 and the first electrode 131 can be electrically connected by clamping or welding.

[0066] As shown in the above embodiment of the present application, the spark plug 100 further comprises a first cover 160, one end of the shell 110 is provided with a first opening 112 which is in communication with the accommodating cavity 111, and the first cover 160 is arranged on the first opening 112 and abuts against one end of the first insulating fixing member 140 which is away from the first electrode 131. Figure 1 Figure 2 As shown in the above embodiment of the present application, the spark plug 100 further comprises a first cover 160, one end of the shell 110 is provided with a first opening 112 which is in communication with the accommodating cavity 111, and the first cover 160 is arranged on the first opening 112 and abuts against one end of the first insulating fixing member 140 which is away from the first electrode 131.

[0067] In the embodiment, one end of the shell 110 is provided with a first opening 112 which is in communication with the accommodating cavity 111, and the first cover 160 is arranged on the first opening 112 and abuts against one end of the first insulating fixing member 140 which is away from the first electrode 131, so that the first insulating fixing member 140 is stably arranged in the accommodating cavity 111 under the abutting action of the first cover 160, and the first electrode 131 is stably kept at the center line position of the accommodating cavity 111 and the through hole 1321.

[0068] For example, the first cover 160 can be threadedly connected with the peripheral wall of one end of the shell 110 to be arranged on the first opening 112.

[0069] As shown in the above embodiment of the present application, the spark plug 100 further comprises a second insulating fixing member 170, and the second insulating fixing member 170 is arranged in the accommodating cavity 111, and one end of the second electrode 132 which is away from the first electrode 131 is connected with the second insulating fixing member 170. Figure 2

[0070] ​​In the embodiment, the second electrode 132 is connected to the second insulating fixing member 170 at the end away from the first electrode 131 by being arranged in the accommodating cavity 111 and connected to the second insulating fixing member 170. On the one hand, the second electrode 132 is stably kept in the center line position of the accommodating cavity 111 under the fixing of the second insulating fixing member 170, so that the second electrode 132 is stably kept in the outer periphery of the first electrode 131, and the discharge ignition function of the electrode assembly 130 is ensured. On the other hand, the second electrode 132 is insulated from other components under the insulation of the second insulating fixing member 170, so that the occurrence of phenomena such as electric leakage and short circuit caused by the contact between the second electrode 132 and other components is avoided.

[0071] For example, the connection between the second electrode 132 and the second insulating fixing member 170 can be clamping or threaded connection.

[0072] As shown in Figure 1 and Figure 2 In the above embodiment, the spark plug 100 further comprises a second cover 180 and an ultrasonic assembly 190. The shell 110 has a second opening 113 communicating with the accommodating cavity 111 at the end away from the first opening 112. The second cover 180 is arranged on the second opening 113. One end of the ultrasonic assembly 190 is arranged on the second cover 180, and the other end of the ultrasonic assembly 190 is sequentially arranged in the second cover 180, the accommodating cavity 111, the second insulating fixing member 170 and abuts against the first electrode 131.

[0073] In the embodiment, one end of the ultrasonic assembly 190 is arranged on the second cover 180, and the other end of the ultrasonic assembly 190 is sequentially arranged in the second cover 180, the accommodating cavity 111, the second insulating fixing member 170 and abuts against the first electrode 131. When the ultrasonic assembly 190 works, the cavitation effect and acceleration effect of ultrasonic waves are used to effectively strip the dirt and impurities on the surface of the electrode assembly 130, so as to restore the normal working state of the electrode assembly 130, and the discharge ignition function of the electrode assembly 130 is ensured.

[0074] The embodiment of the application further provides an internal combustion engine comprising the spark plug 100 described in the above embodiment.

[0075] The internal combustion engine has the spark plug 100 in any of the above embodiments, and thus has all the beneficial effects of the spark plug 100, which will not be repeated here.

[0076] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0077] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A spark plug characterized by, include: The shell has a receiving cavity; A pipe assembly, the pipe assembly including an inlet pipe and an outlet pipe, the receiving cavity being connected to the inlet pipe and the outlet pipe respectively; An electrode assembly is disposed within the receiving cavity. The electrode assembly includes a first electrode and a second electrode. The second electrode has a through hole with an internal thread on the wall of the through hole. The first electrode passes through the through hole and has an external thread on its circumferential wall. The external thread has the opposite direction of rotation to the internal thread. Alternatively, the through hole has multiple protrusions arranged in an array on its wall, and the first electrode passes through the through hole.

2. The spark plug of claim 1, wherein There is a gap between the external thread and the internal thread.

3. The spark plug of claim 1, wherein Along the axial direction of the electrode assembly, the length of the external thread is greater than the length of the internal thread.

4. The spark plug of claim 1, wherein The internal thread is right-handed, and the external thread is left-handed. Alternatively, the internal thread may be left-handed, and the external thread may be right-handed.

5. The spark plug of any one of claims 1 to 4, wherein The spark plug also includes a first insulating fastener disposed within the receiving cavity, and the end of the first electrode away from the second electrode is connected to the first insulating fastener.

6. The spark plug of claim 5, wherein The spark plug also includes a conductive element. The first insulating fixing member has a mounting hole, and the conductive element passes through the mounting hole and is electrically connected to the first electrode.

7. The spark plug of claim 5, wherein The spark plug also includes a first cover, one end of the housing having a first opening communicating with the receiving cavity, the first cover covering the first opening and abutting against the end of the first insulating fastener away from the first electrode.

8. The spark plug of claim 7 wherein, The spark plug also includes a second insulating fastener, which is disposed within the receiving cavity, and the end of the second electrode away from the first electrode is connected to the second insulating fastener.

9. The spark plug of claim 8, wherein The spark plug also includes a second cover and an ultrasonic component. The end of the housing away from the first opening has a second opening that communicates with the receiving cavity. The second cover is placed on the second opening. One end of the ultrasonic component is disposed on the second cover, and the other end passes through the second cover, the receiving cavity, and the second insulating fastener in sequence and abuts against the first electrode.

10. An internal combustion engine characterized by comprising: The spark plug includes any one of claims 1 to 9.

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