CN209948332U

CN209948332U - Resistance type spark plug

Info

Publication number: CN209948332U
Application number: CN201920823409.1U
Authority: CN
Inventors: 宋天顺
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-06-06
Filing date: 2019-06-06
Publication date: 2020-01-14
Anticipated expiration: 2029-06-06

Abstract

A resistance type spark plug is mainly composed of a main body member, an insulator, side electrodes, a center electrode, and the like. The outer diameter of the insulator inside the fitting mounting threaded portion is equal to the inner diameter of the fitting mounting threaded portion. The curved surface at the upper end of the insulator and the upper end surface of the main fitting are covered with a carbon deposition prevention heat insulation layer. The carbon deposition prevention heat insulation layer is formed by coating a coating taking ceramic hollow microspheres as a matrix or bonding the ceramic hollow microspheres and a nano ceramic dispersion liquid; the outer surface of the nano-ceramic coating is coated with nano-ceramic dispersion liquid. The upper end of the central electrode is sleeved and welded with the upper end ring of the central electrode. The outer wall of the upper section of the central electrode is coated with an overheating-proof heat-insulating layer, and then is coated with a nano coating by using the nano ceramic dispersion liquid. The lower surface of the upper end of the side electrode is welded with a side electrode thin rod electrode. When in use, the side electrode is connected with a high-voltage anode, and the central electrode is connected with a high-voltage cathode. The beneficial effects of the utility model are that economic service life is long.

Description

Resistance type spark plug

Technical Field

The utility model relates to an electric ignition device, especially a resistance type spark plug of economic long service life.

Background

In fig. 1, a resistance type spark plug which is generally used at present mainly includes a metallic shell 1, an insulator 2, a side electrode 3, a center electrode 4, a damping resistor 5, a terminal electrode 6, and the like. The center electrode 4, the damping resistor 5 and the terminal electrode 6 electrically connected to each other are connected to the positive electrode of the striking high voltage, and the side electrode 3 and the metallic shell 1 welded to each other are connected to the negative electrode of the striking high voltage. The insulator 2 surrounding the center electrode 4 and the damping resistor 5 is susceptible to insulation aging from the outside to the inside due to the strong electric field and high temperature. In use, the withstand voltage between the electrically connected center electrode 4 and damping resistor 5 and metal shell 1 drops more rapidly than when the center electrode 4 and damping resistor 5 are connected to a high voltage negative electrode and the side electrode 3 and metal shell 1 are connected to a high voltage positive electrode. So that the service life of the resistance type spark plug which is generally used at present is short.

Disclosure of Invention

In order to overcome the above-mentioned deficiencies of the prior known resistance type spark plug, the utility model provides a resistance type spark plug, its economic life can be showing and be prolonged.

The technical proposal adopted by the utility model for solving the technical problems is that the utility model mainly comprises a main body accessory, an insulator, a side electrode, a center electrode and the like. The outer diameter of the alumina ceramic insulator inside the fitting mounting threaded portion of the main body is equal to the inner diameter of the fitting mounting threaded portion of the main body. The utility model discloses a when the end of striking sparks upwards perpendicularly, the insulator up end is recessed to be leaks hopper-shaped, and recessed insulator upper end curved surface and main part up end cover the anti-carbon deposition insulating layer. The carbon deposition prevention heat insulation layer is generally formed by coating a coating taking ceramic hollow microspheres as a matrix or bonding the ceramic hollow microspheres and a nano ceramic dispersion liquid; the outer surface is preferably coated with a thin layer of nanocoating using a nanoceramic dispersion.

The central electrode is made of nickel alloy coated copper, and the diameter of the upper section of the central electrode above the lowest part of the curved surface at the upper end of the insulator is smaller than that of the lower section of the central electrode without the lower end part. The upper end of the central electrode is sleeved and welded with a metal central electrode upper end ring, the upper surface of the central electrode upper end ring is level with the upper end surface of the central electrode, and the central electrode upper end ring is generally made of nickel alloy. The outer wall of the upper section of the small-diameter central electrode below the upper end ring of the central electrode is coated with an overheating-proof heat-insulating layer, and then a thin nano coating is coated with the nano ceramic dispersion liquid. The diameter of the upper section of the central electrode coated with the overheating-proof heat-insulating layer and the nano coating is not larger than the minimum inner diameter of the insulator from the lowest part of the curved surface of the upper end of the insulator to the lower part of the insulator. The ceramic hollow microspheres and the nano ceramic dispersion liquid are preferably alumina hollow microspheres and nano alumina dispersion liquid respectively. The upper end part of the side electrode is just welded on the lower surface of the central electrode to form a side electrode thin rod electrode made of noble metal, and the lower end surface of the side electrode thin rod electrode protrudes downwards. The side electrode is connected with a high-voltage anode, and the central electrode is connected with a high-voltage cathode.

According to the structure, the following steps are carried out: the temperature of the outer surface of the carbon deposition prevention heat insulation layer (the nano coating layer coated on the surface of the carbon deposition prevention heat insulation layer) can be adjusted by adjusting the thickness of the carbon deposition prevention heat insulation layer so as to prevent carbon deposition. The temperature of the upper end part of the insulator and the intensity of an electric field in which the upper end part is positioned are obviously reduced compared with the existing commonly used resistance type spark plug, and further, the insulation aging of the upper end part of the insulator can be obviously delayed. The overheating-proof heat insulation layer can prevent the temperature at the upper end of the central electrode from being too high; and secondly, the central electrode can be prevented from absorbing excessive heat and conducting downwards, so that the temperature of the insulator around the lower section of the central electrode is reduced, and the insulation aging of the insulator is delayed. That is, the above-mentioned combination of factors can significantly delay the reduction of the insulation resistance of the insulator. The upper end surface formed by the side electrode thin rod electrode, the central electrode and the central electrode upper end ring can well form a pair of rod positive plate negative rod-plate discharge electrodes, so that the breakdown voltage between the side electrode thin rod electrode and the central electrode can be obviously reduced. The nanocoating reduces surface area fouling. Based on the above reason, the utility model discloses an economic service life can be showing the extension.

The beneficial effects of the utility model are that its economic life can be showing the extension.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a central sectional view of a resistance type spark plug which is currently in common use.

Figure 2 is a central sectional view of the upper half of the embodiment of the present invention.

In the figure: 1. the main part accessory, 2, insulator, 3, side electrode, 3A, side electrode thin rod electrode, 4, center electrode, 5, damping resistor, 6, terminal electrode, 7, center electrode upper end ring, 8, overheating-proof heat-insulating layer, 9, nano coating, 10, carbon deposition-proof heat-insulating layer.

Detailed Description

In fig. 2, the outer diameter of the alumina insulator 2 inside the mounting threaded portion of the metal shell 1 is equal to the inner diameter of the mounting threaded portion of the metal shell 1. The concave insulator 2 upper end curved surface and the main fitting 1 upper end surface cover the carbon deposition prevention heat insulation layer 10, the carbon deposition prevention heat insulation layer 10 is formed by bonding the alumina hollow microspheres and the nano alumina dispersion liquid. The central electrode 4 is made of nickel alloy copper, and the upper end part of the central electrode 4 is sleeved and welded with a central electrode upper end ring 7 made of nickel alloy. The outer wall of the upper section of the central electrode 4 is coated with an overheating-proof heat-insulating layer 8 by using a high-temperature-resistant heat-insulating coating which can resist the temperature of more than 500 ℃, and then coated with a nano coating 9 by using a nano alumina dispersion liquid. The upper end part of the side electrode 3 is welded with a side electrode thin rod electrode 3A of noble metal right facing to the lower surface of the central electrode 4, and the lower end surface of the side electrode thin rod electrode 3A protrudes downwards. When in use, the side electrode 3 is connected with a high-voltage positive electrode, and the central electrode 4 is connected with a high-voltage negative electrode.

Claims

1. A resistance type spark plug is mainly composed of a main body fitting, an insulator, side electrodes, a center electrode and the like; the central electrode is made of nickel alloy coated copper, and the upper end part of the side electrode is welded on the lower surface of the central electrode by a side electrode thin rod electrode; the method is characterized in that:

the outer diameter of the insulator inside the fitting mounting threaded portion of the main body is equal to the inner diameter of the fitting mounting threaded portion of the main body; the curved surface at the upper end of the insulator and the upper end surface of the main part are covered with a carbon deposition prevention heat insulation layer; the diameter of the upper section of the central electrode above the lowest part of the curved surface at the upper end of the insulator is smaller than that of the lower section of the central electrode except the lower end part; the upper end of the central electrode is sleeved and welded with an upper end ring of the central electrode, and the upper surface of the upper end ring of the central electrode is level with the upper end surface of the central electrode; the outer wall of the upper section of the central electrode, which is downwards surrounded by the upper end ring of the central electrode, is coated with an overheating-proof heat-insulating layer firstly, and then is coated with a nano coating by using a nano ceramic dispersion liquid; the diameter of the upper section of the central electrode coated with the overheating-proof heat-insulating layer and the nano coating is not larger than the minimum inner diameter of the insulator; the lower end surface of the side electrode thin rod electrode protrudes downwards; the side electrode is connected with a high-voltage anode, and the central electrode is connected with a high-voltage cathode.

2. A resistive spark plug as claimed in claim 1, wherein: the curved surface of the upper end of the insulator is funnel-shaped.

3. A resistive spark plug as claimed in claim 1, wherein: the carbon deposition prevention heat insulation layer is formed by coating a coating taking ceramic hollow microspheres as a matrix or bonding the ceramic hollow microspheres and a nano ceramic dispersion liquid.

4. A resistive spark plug as claimed in claim 1, wherein: and the outer surface of the carbon deposition prevention heat insulation layer is coated with a nano coating by using a nano ceramic dispersion liquid.

5. A resistive spark plug as claimed in claim 3, wherein: the ceramic hollow microspheres are alumina hollow microspheres.

6. A resistance type spark plug according to claim 3 or 4, wherein: the nano ceramic dispersion liquid is nano alumina dispersion liquid.