Spark plug

Abstract

The utility model relates to the technical field of spark plugs, in particular to a spark plug, which comprises an upper shell and a detachable lower shell mounted at the bottom of the upper shell, a ceramic insulator is arranged on the outer wall of the upper shell close to the top, a threaded column is arranged at the bottom of a first hexagonal stud, and a central electrode penetrating through the upper shell is arranged in the middle of the upper shell. A side electrode is arranged at the bottom of the outer wall of the lower shell corresponding to the center of the bulge; an external thread insertion ring is arranged at the top of the lower shell corresponding to the internal thread groove; according to the spark plug, an upper shell with a ceramic insulator is arranged, a lower shell with a second hexagonal stud is in threaded connection with an internal thread groove through an external thread insertion ring, threaded connection between the lower shell and the upper shell is achieved under the cooperation of a first hexagonal stud, and a central electrode with a terminal post penetrates into a through hole of the lower shell from the upper shell; the bottom of the center motor is attached to and close to the side electrode, and under the cooperation of the threaded column, the whole body can be in threaded connection with an external object needing to be ignited.

Description

Technical Field

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

[0002] Spark plugs are important components of the gasoline engine ignition system. Without spark plugs, the car will not start. Spark plugs are generally installed on the side or top of the engine. Under the action of high voltage, the air between the central electrode and the side electrode of the spark plug will quickly ionize to form positively charged ions and negatively charged free electrons. Generally, high-power and high-compression engines use cold-type spark plugs with high calorific value, while low-power and low-compression engines use hot-type spark plugs with low calorific value.

[0003] The utility model with the announcement number CN218415331U discloses an engine spark plug with good sealing performance, including a spark plug body, a fixing screw is provided on the spark plug body, a hexagonal nut is fixedly connected to the fixing screw, a pressing block is fixedly connected to the bottom end of the hexagonal nut, a multi-layer sealing mechanism is sleeved on the fixing screw, the multi-layer sealing mechanism includes a pressing annular seat and a supporting annular seat, and the bottom surface of the pressing annular seat and the top surface of the supporting annular seat are both fixedly connected with extrusion protrusions;

[0004] The above technical scheme, by setting up a multi-layer sealing mechanism, rotating the spark plug body to drive the clamping block to move, and squeezing the elastic sealing sleeve, can improve the air tightness to a certain extent, and the squeezing protrusion generates pressure on the air duct, and the air duct is pressurized to pass the gas into the sealing airbag, and the sealing airbag expands after inflation, filling the gap to form a multi-layer seal, preventing the leakage of flammable gas, improving the sealing effect and safety, and thus improving the overall air tightness; however, the spark plug needs to be replaced and repaired when used for a long time, and the overall replacement causes a waste of resources, is not convenient for reducing cost losses, and is not convenient for quick installation operations when installed in combination. Utility Model Content

[0005] The purpose of the utility model is to provide a spark plug to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A spark plug comprises an upper shell and a detachable lower shell installed at the bottom of the upper shell, a ceramic insulator is provided on the outer wall of the upper shell near the top, a first hexagonal stud is provided at the bottom of the ceramic insulator, a threaded column is provided at the bottom of the first hexagonal stud, an internal thread groove is provided near the middle of the bottom of the upper shell, a center electrode penetrating the upper shell is provided in the middle of the upper shell, a protrusion is provided at the bottom of the lower shell, a through hole is provided in the middle of the protrusion corresponding to the center electrode, a side electrode is provided at the bottom of the outer wall of the lower shell corresponding to the center of the protrusion, an external threaded insert ring is provided at the top of the lower shell corresponding to the internal thread groove, and a second hexagonal stud is provided on the outer wall of the lower shell near the top.

[0008] Preferably, the inner wall of the ceramic insulator is bonded and fixed to the outer wall of the upper shell, and the first hexagonal stud and the upper shell are an integrally formed structure.

[0009] In the utility model, the installation of the ceramic insulator increases the insulation of the outer wall of the upper shell, reduces the influence of conduction on the central electrode, and provides a fulcrum with the cooperation of the first hexagonal stud, so as to facilitate the installation and cooperation between the upper shell and the external object.

[0010] Preferably, a threaded column is sleeved on the outer wall of the upper shell near the bottom, and the threaded column and the upper shell are an integrally formed structure.

[0011] In the utility model, a threaded column is provided to realize threaded connection with a screw groove corresponding to an external object, thereby increasing the stability of installation.

[0012] Preferably, the center electrode is bonded and fixed to the upper shell, the top of the center electrode passes through the upper shell, and a terminal post is provided at one end thereof, and the terminal post is welded and fixed to the center electrode.

[0013] In the utility model, the central electrode is matched with a terminal post, and with the cooperation of the terminal post, it is helpful to electrically connect with external electrical appliances.

[0014] Preferably, the bottom of the external thread insert ring and the lower shell are an integrally formed structure, the outer diameter of the external thread insert ring is matched with the inner diameter of the internal thread groove, and the external thread insert ring is threadedly connected to the internal thread groove.

[0015] In the utility model, an external thread insert ring is provided to be threadedly connected with an internal thread groove, which helps to thread the lower shell body and the upper shell body, thereby realizing rapid splicing and installation.

[0016] Preferably, the second hexagonal stud and the lower shell are an integrally formed structure, and the outer diameter of the second hexagonal stud is smaller than the outer diameter of the threaded column.

[0017] In the utility model, a second hexagonal stud is provided to provide a fulcrum, which helps to provide a contact position for the tight threaded connection between the lower shell and the upper shell. When the lower shell is installed on an external object, the outer diameter of the second hexagonal stud is smaller than the outer diameter of the threaded column, which does not affect the threaded connection between the threaded column and the external installation object.

[0018] Preferably, the inner diameter of the through hole is matched with the diameter of the central electrode, the bottom of the central electrode passes through the bottom of the through hole, the side electrode is L-shaped, and the end of the side electrode is close to the bottom of the central electrode.

[0019] In the utility model, the installation of the side electrode and its coordination with the center electrode are helpful for ignition coordination.

[0020] Preferably, a rubber pad is provided above the second hexagonal stud, the rubber pad is in a circular ring shape, and the outer diameter of the rubber pad is matched with the outer diameter of the threaded column.

[0021] In the utility model, the provision of the rubber pad increases the friction force, so that the second hexagonal stud and the threaded column can be closely fitted together, thereby increasing the friction force and reducing the effect of the upper shell and the lower shell being separated due to slipping.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] 1. The utility model provides an upper shell with a ceramic insulator, and a lower shell with a second hexagonal stud is threadedly connected to an internal thread groove through an external thread insert ring. With the cooperation of the first hexagonal stud, the lower shell and the upper shell are threadedly connected. The center electrode with the terminal column passes through the upper shell to the through hole of the lower shell, so that the bottom of the center motor and the side electrode are close to each other. With the cooperation of the threaded column, it is helpful to thread the whole with an external object that needs to be ignited.

[0024] 2. The utility model increases the fulcrum points by setting the first hexagonal stud and the second hexagonal stud to cooperate with each other, which helps to tightly combine and connect the upper shell and the lower shell. With the cooperation of the rubber pad, the friction between the lower shell and the bottom of the threaded column is increased, which helps to tightly fit the combination. With the cooperation of the ceramic insulator, the influence of the conductivity of the upper shell on the center electrode is reduced. The overall combination is convenient to install, and the upper shell and the lower shell are easy to replace and cooperate independently, reducing resource waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 This is a schematic diagram of the upper shell structure of the utility model;

[0027] Figure 3 This is a schematic diagram of the lower shell structure of the utility model;

[0028] Figure 4 This is a schematic diagram of the cross-sectional structure of the lower shell of the utility model;

[0029] Figure 5 It is a schematic diagram of the overall cross-sectional structure of the utility model.

[0030] The meaning of each number in the figure is:

[0031] Upper shell; 10, ceramic insulator; 11, first hexagonal stud; 12, threaded column; 13, internal thread groove; 14, center electrode; 15, terminal post;

[0032] Lower shell; 20, second hexagonal stud; 21, rubber pad; 22, external thread insert ring; 23, protrusion; 230, perforation; 24, side electrode. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] See also Figure 1-Figure 5 , this embodiment provides a technical solution:

[0035] A spark plug comprises an upper shell 1 and a detachable lower shell 2 mounted at the bottom of the upper shell 1. A ceramic insulator 10 is provided on the outer wall of the upper shell 1 near the top. The inner wall of the ceramic insulator 10 is bonded and fixed to the outer wall of the upper shell 1. A first hexagonal stud 11 is an integrally formed structure with the upper shell 1.

[0036] In the utility model, the installation of the ceramic insulator 10 increases the insulation of the outer wall of the upper shell 1, reduces the influence of conduction on the central electrode 14, and provides a fulcrum with the cooperation of the first hexagonal stud 11, so as to facilitate the installation and cooperation between the upper shell 1 and the external objects.

[0037] Furthermore, a first hexagonal stud 11 is provided at the bottom of the ceramic insulator 10, a threaded column 12 is provided at the bottom of the first hexagonal stud 11, and the threaded column 12 is sleeved on the outer wall of the upper shell 1 near the bottom. The threaded column 12 and the upper shell 1 are an integrally formed structure.

[0038] In the present invention, a threaded column 12 is provided to achieve threaded connection with a corresponding screw groove of an external object, thereby increasing the stability of the installation.

[0039] Specifically, an internal thread groove 13 is opened near the middle of the bottom of the upper shell 1, and a center electrode 14 is provided in the middle of the upper shell 1 and penetrates the upper shell 1. The center electrode 14 is bonded and fixed to the upper shell 1. The top of the center electrode 14 passes through the upper shell 1, and a terminal post 15 is provided at one end. The terminal post 15 is welded and fixed to the center electrode 14.

[0040] In the present invention, the central electrode 14 is matched with a terminal post 15 , and with the cooperation of the terminal post 15 , it is helpful to electrically connect with external electrical appliances.

[0041] It should be noted that a protrusion 23 is provided at the bottom of the lower shell 2, a through hole 230 is opened in the middle of the protrusion 23 corresponding to the center electrode 14, a side electrode 24 is provided at the bottom of the outer wall of the lower shell 2 corresponding to the center of the protrusion 23, an external threaded insert ring 22 is provided at the top of the lower shell 2 corresponding to the internal thread groove 13, the bottom of the external threaded insert ring 22 and the lower shell 2 are an integrally formed structure, the outer diameter of the external threaded insert ring 22 is matched with the inner diameter of the internal thread groove 13, and the external threaded insert ring 22 is threadedly connected to the internal thread groove 13.

[0042] In the present invention, an external thread insert ring 22 is provided to be threadedly connected with the internal thread groove 13, which helps to thread the lower shell 2 with the upper shell 1 and realizes rapid splicing and installation.

[0043] Furthermore, a second hexagonal stud 20 is provided on the outer wall of the lower shell 2 near the top. The second hexagonal stud 20 and the lower shell 2 are an integrally formed structure, and the outer diameter of the second hexagonal stud 20 is smaller than the outer diameter of the threaded column 12 .

[0044] In the utility model, a second hexagonal stud 20 is provided to provide a fulcrum, which helps to provide a contact position for the tight threaded connection between the lower shell 2 and the upper shell 1, and when the lower shell 2 is installed on an external object, the outer diameter of the second hexagonal stud 20 is smaller than the outer diameter of the threaded column 12, which does not affect the threaded connection between the threaded column 12 and the external installation object.

[0045] Specifically, the inner diameter of the through hole 230 is matched with the diameter of the central electrode 14 , the bottom of the central electrode 14 passes through the bottom of the through hole 230 , the side electrode 24 is L-shaped, and the end of the side electrode 24 is close to the bottom of the central electrode 14 .

[0046] In the present invention, the installation of the side electrode 24 and its cooperation with the center electrode 14 are helpful for ignition cooperation.

[0047] It is worth adding that a rubber pad 21 is provided above the second hexagonal stud 20 . The rubber pad 21 is in a circular ring shape, and the outer diameter of the rubber pad 21 is matched with the outer diameter of the threaded column 12 .

[0048] In the present invention, the provision of the rubber pad 21 increases the friction force, so that the second hexagonal stud 20 and the threaded column 12 can be closely fitted together, thereby increasing the friction force and reducing the effect of the upper shell 1 and the lower shell 2 being separated due to slipping.

[0049] When using the spark plug of this embodiment, the user first plugs and installs the center electrode 14 with the upper shell 1, and the terminal post 15 is located at the top of the upper shell 1 and welded to the center electrode 14, then the ceramic insulator 10 is sleeved on the upper shell 1 with the internal thread groove 13, and the lower shell 2 with the rubber pad 21 is combined and connected with the second hexagonal stud 20, and then the lower shell 2 is plugged and installed with the upper shell 1, the center electrode 14 is inserted into the through hole 230, and the bottom of the center electrode 14 and the bottom of the side electrode 24 are close to each other, and under the cooperation of the second hexagonal stud 20, the external thread insert ring 22 is threadedly connected with the internal thread groove 13, and under the cooperation of the rubber pad 21, the friction force of the combination of the lower shell 2 and the upper shell 1 is increased;

[0050] When it needs to be installed with an external object that needs to be ignited, the threaded connection with the external object is achieved through the threaded column 12 on the upper shell 1. The overall assembly is convenient to install. After long-term ignition and startup, when the upper shell 1 or the lower shell 2 needs to be replaced, it is convenient to take out the whole with the cooperation of the first hexagonal stud 11. According to the degree of damage and consumption, the upper shell 1 and the lower shell 2 can be replaced separately to reduce the impact of resource waste.

Claims

1. A spark plug, comprising an upper shell (1) and a lower shell (2) detachably mounted on the bottom of the upper shell (1), characterized in that: A ceramic insulator (10) is provided on the outer wall of the upper shell (1) near the top, a first hexagonal stud (11) is provided at the bottom of the ceramic insulator (10), a threaded column (12) is provided at the bottom of the first hexagonal stud (11), an internal thread groove (13) is provided near the middle of the bottom of the upper shell (1), a center electrode (14) penetrating the upper shell (1) is provided in the middle of the upper shell (1), a protrusion (23) is provided at the bottom of the lower shell (2), a through hole (230) is provided in the middle of the protrusion (23) corresponding to the center electrode (14), a side electrode (24) is provided at the bottom of the outer wall of the lower shell (2) corresponding to the center of the protrusion (23), an external thread insert ring (22) is provided at the top of the lower shell (2) corresponding to the internal thread groove (13), and a second hexagonal stud (20) is provided on the outer wall of the lower shell (2) near the top.

2. The spark plug according to claim 1, characterized in that: The inner wall of the ceramic insulator (10) is bonded and fixed to the outer wall of the upper shell (1), and the first hexagonal stud (11) and the upper shell (1) are an integrally formed structure.

3. The spark plug according to claim 1, characterized in that: A threaded column (12) is sleeved on the outer wall of the upper shell (1) near the bottom, and the threaded column (12) and the upper shell (1) are an integrally formed structure.

4. The spark plug according to claim 1, characterized in that: The central electrode (14) is bonded and fixed to the upper shell (1); the top of the central electrode (14) passes through the upper shell (1), and a terminal post (15) is provided at one end of the central electrode (14); the terminal post (15) is welded and fixed to the central electrode (14).

5. The spark plug according to claim 1, characterized in that: The bottom of the external thread insert ring (22) and the lower shell (2) are an integrally formed structure, the outer diameter of the external thread insert ring (22) is matched to the inner diameter of the internal thread groove (13), and the external thread insert ring (22) is threadedly connected to the internal thread groove (13).

6. The spark plug according to claim 1, characterized in that: The second hexagonal stud (20) and the lower shell (2) are an integrally formed structure, and the outer diameter of the second hexagonal stud (20) is smaller than the outer diameter of the threaded column (12).

7. The spark plug according to claim 1, characterized in that: The inner diameter of the through hole (230) is matched to the diameter of the central electrode (14); the bottom of the central electrode (14) passes through the bottom of the through hole (230); the side electrode (24) is L-shaped; the end of the side electrode (24) is close to the bottom of the central electrode (14).

8. The spark plug according to claim 1, characterized in that: A rubber pad (21) is provided above the second hexagonal stud (20); the rubber pad (21) is in the shape of a circular ring, and the outer diameter of the rubber pad (21) is matched to the outer diameter of the threaded column (12).

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