WO2018095433A1

WO2018095433A1 - Spark plug

Info

Publication number: WO2018095433A1
Application number: PCT/CN2017/113284
Authority: WO
Inventors: 柳孟柱
Original assignee: 霾消天蓝（北京）环保科技有限公司
Priority date: 2016-11-28
Filing date: 2017-11-28
Publication date: 2018-05-31
Also published as: CN108123368A

Abstract

Disclosed is a spark plug, comprising a spark plug housing, an insulator and a central electrode. A hollow cavity is arranged inside the spark plug housing, the insulator is fixedly arranged at a lower portion inside the hollow cavity, and the central electrode is encapsulated in the insulator, an upper top portion of the central electrode extending out of the insulator and being exposed inside the hollow cavity of the spark plug housing, characterized in that, a negative sparking unit is arranged above the central electrode, the negative sparking unit comprising a housing and a negative electrode; a lower end portion of the housing is fixedly connected to an upper end portion of the spark plug housing, and a cavity inside the housing and the hollow cavity inside the spark plug housing form a capacity expanding cavity; and a bottom face of the housing of the negative sparking unit is fixedly provided with a negative electrode extending downwards, a lower end portion of the negative electrode being directly opposite an upper end portion of the central electrode. In the spark plug of the present invention, the phenomenon of flame retarding no longer appears, the sparking performance is stable, and the misfiring rate is low, which can effectively improve power by more than 10% and enable the exhaust gas recovery rate to be more than 45%.

Description

Spark plug

Technical field

The invention relates to the field of spark plugs for automobiles, and in particular to a spark plug for vertical ignition.

Background technique

Referring to Figure 1, a "spark plug" of the Chinese Patent Application No. 201320592082.4 discloses a spark plug 200 comprising a spark plug housing 201, an insulator 202 and a central electrode 203;

The spark plug housing 201 is provided with a hollow cavity 204. The insulator 202 is fixed in the lower part of the hollow cavity 204. The central electrode 203 is wrapped in the insulator 202. The top of the central electrode 203 extends through the insulator 202. In the hollow cavity 204 of the spark plug housing 201; the insulator 202 may be made of a material having a high thermal conductivity, such as a sintered alumina ceramic material;

A negative electrode firing unit 205 is disposed above the central electrode 203, and the negative electrode firing unit has a cylindrical shape. The inner wall of the hollow cavity 204 at the lower edge of the negative electrode firing unit 205 is provided with a blocking device 206; the hollow cavity 204 The upper end edge is bent to form a limiting portion 207, the negative firing unit 205 is fixed between the limiting portion 207 and the blocking device 206; and the negative firing device 205 is uniformly provided with four longitudinal through negative electrodes. The exhaust hole 208 of the fire unit 205; the area of the exhaust hole 208 occupies 40% of the cross-sectional area of the negative ignition unit 205. The closest distance of the central electrode 203 to the wall of the hollow cavity 204 is greater than the closest distance of the central electrode 203 to the negative firing device 205;

The negative electrode firing unit 205 is made of a conductive material, such as copper, steel or nickel. The best choice is that the negative firing unit 205 is made of the same material as the spark plug housing 201, so that the negative firing unit 205 and the spark plug housing can be ensured. 201 has the same expansion coefficient, ensuring that the fixation between the negative firing unit 205 and the spark plug housing 201 does not move.

The above-mentioned spark plug has the following defects: after the center electrode and the negative electrode firing unit are ignited, the spark plug has a flame retarding phenomenon, the ignition performance is unstable, and the misfire rate is high, and the exhaust gas recovery is between 20-35%.

Summary of the invention

The technical problem to be solved by the present invention is to provide a spark plug. The spark plug no longer has a deflagration phenomenon, the ignition performance is stable, the fire rate is low, the power can be effectively increased by more than 10%, and the exhaust gas recovery is more than 45%.

In order to solve the above technical problem, the present invention adopts the following technical solutions:

a spark plug comprising a spark plug housing, an insulator and a center electrode; the spark plug housing Providing a hollow cavity, the insulator is fixed in the lower part of the hollow cavity, the central electrode is covered in the insulator, and the top electrode of the central electrode extends through the insulator and is exposed in the hollow cavity of the spark plug casing; above the central electrode a negative ignition unit is provided, the negative ignition unit includes a housing and a negative electrode; the lower end of the housing is fixedly connected to the upper end of the spark plug housing, and the cavity in the housing and the hollow cavity in the spark plug housing form a expansion chamber; A bottomed negative electrode is fixedly disposed on a bottom surface of the casing of the negative electrode firing unit, and a lower end portion of the negative electrode is opposite to an upper end portion of the central electrode.

In the course of the research, the present invention unexpectedly discovered that by providing a downward independent negative electrode in the housing of the negative firing unit, the volume of the ignition chamber is expanded, and more importantly, the double electrode tip is positive. The pair can greatly improve the ignition stability performance, greatly reduce the fire rate, and also solve the flame retardant phenomenon existing in the existing spark plug. After research and testing, the stability of ignition is increased by more than 25%, and the fire rate is reduced by more than 10%.

Preferably, the distance between the lower end portion of the negative electrode and the upper end portion of the center electrode is 0.5 to 1.2 mm. It has been found that this distance is the best condition for stable ignition between electrodes.

Preferably, the negative electrode comprises an upper cylinder, a middle cone and a lower end. The arrangement of the lower end portion and the overall negative ignition unit in the background art as a negative electrode form a huge difference, and the ignition point of the overall negative ignition unit in the background art has a state in which the ignition point is indeterminate, and in the present application The sparking point is very stable.

Preferably, the top end of the center electrode is gradually tapered excessively to form a top thin end portion; the top end portion of the center electrode is the same diameter as the lower end portion of the lower electrode portion. Experiments have shown that the diameter of the end of the negative electrode and the end of the central electrode are substantially uniform to contribute to the stability of the ignition and to reduce the misfire rate.

Preferably, the lower end portion of the negative electrode is made of base metal, and the thin end portion of the center electrode is also made of base metal. By using a base metal as a raw material, the thin end portion of the lower portion of the negative electrode and the top end portion of the center electrode can be prevented from being excessively used due to excessive loss.

Preferably, a top of the housing of the negative ignition unit is provided with a plurality of air outlets;

Preferably, a plurality of exhaust gas outlets are disposed on a side wall of the casing of the negative electrode firing unit.

The beneficial effects of the present invention are as follows:

The spark plug of the invention no longer has a phenomenon of retarding, the performance of the ignition is stable, the fire rate is low, and the power can be effectively increased by more than 10%.

DRAWINGS

1 is a schematic structural view of a conventional spark plug;

2 is a schematic cross-sectional view of a negative ignition unit of the present invention;

detailed description

The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Example 1

See Figure 2,

A spark plug includes a spark plug housing 10, an insulator 11 and a central electrode 12; a cavity 13 is disposed in the spark plug housing, the insulator 11 is fixed in a lower portion of the hollow cavity 13, and the central electrode 12 is coated on the insulator 11 The top electrode extending through the insulator 11 is exposed in the hollow cavity 13 of the spark plug housing 10; the negative electrode firing unit 20 is disposed above the central electrode 12, and the negative firing device 20 includes a housing 21 and a negative The electrode 22; the lower end of the housing 21 and the upper end of the spark plug housing 10 are fixedly connected, for example, welded, screwed, etc.; the cavity 210 in the housing 21 and the hollow cavity 13 in the spark plug housing 10 integrally form a expansion chamber; The bottom surface of the casing 21 of the negative electrode ignition unit 20 is fixedly provided with a downwardly extending negative electrode 22, and the lower end portion of the negative electrode 22 is opposite to the upper end portion of the central electrode 12.

As a further preferred embodiment, the distance between the lower end portion of the negative electrode 22 and the upper end portion of the center electrode 12 is 0.5 to 1.2 mm.

As a further preferred embodiment, the negative electrode 22 includes an upper cylinder 221, a middle cone 222, and a lower thin end 223. The arrangement of the lower thin end portion 223 and the overall negative ignition unit in the background art as a negative electrode form a huge difference, and the ignition point of the overall negative ignition unit in the background art has a state in which the ignition point is uncertain, and the present application The sparking point in the car is very stable.

As a further preferred embodiment, the upper portion of the center electrode 12 is gradually tapered excessively to form a top thin end portion; the top thin end portion of the center electrode 12 is the same as the diameter of the lower thin end portion 223 of the negative electrode 22. Experiments have shown that the diameter of the lower end portion 223 of the negative electrode and the top end portion of the center electrode 12 are substantially uniform to contribute to the stability of the spark and to reduce the misfire rate. By "substantially identical" is meant that the range of the difference does not exceed 10%, preferably within 5%, more preferably within 3%. After research and testing, the stability of ignition is increased by more than 25%, and the fire rate is reduced by more than 10%.

In a further preferred embodiment, the lower end portion 223 of the negative electrode 22 is made of a base metal material, and the top end portion of the center electrode 12 is also made of a base metal. By using base metal As a raw material, it is possible to reduce the number of times of use of the lower end portion without excessive loss.

As a further preferred embodiment, the top of the housing of the negative ignition device 20 is provided with a plurality of air outlets 23;

As a further preferred embodiment, a plurality of exhaust gas outlets 24 are provided on the side wall of the casing of the negative electrode firing unit 20.

The spark plug of the invention passes the wind tunnel test, and the exhaust gas recovery reaches more than 45%, which is greatly improved compared with the existing spark plug 20-35%.

The words "upper", "lower", "left", "right", etc., used herein to describe azimuth are for convenience of explanation based on the orientation shown in the drawings, in actual devices. The orientation may vary depending on how the device is placed.

It is apparent that the above-described embodiments of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention. Other variations or modifications of the various forms may be made by those skilled in the art in light of the above description. It is not possible to exhaust all implementations here. Obvious changes or variations that come within the scope of the invention are still within the scope of the invention.

Claims

A spark plug includes a spark plug housing, an insulator and a central electrode; a cavity is disposed in the spark plug housing, the insulator is fixed in an inner lower portion of the hollow cavity, the central electrode is covered in an insulator, and the central electrode is on top Extending through the insulator exposed in the hollow cavity of the spark plug housing; characterized in that: a negative ignition unit is disposed above the central electrode, the negative ignition unit includes a housing and a negative electrode; and the lower end of the housing and the upper end of the spark plug housing a fixed connection, a cavity in the housing and a cavity in the spark plug housing form a expansion chamber; a bottom surface of the negative ignition unit is fixedly provided with a downwardly extending negative electrode, the lower end of the negative electrode and the central electrode The upper end is facing right.
The spark plug according to claim 1, wherein a distance between a lower end portion of the negative electrode and an upper end portion of the center electrode is 0.5 to 1.2 mm.
The spark plug of claim 1 wherein said negative electrode comprises an upper cylinder, a central cone and a lower end.
The spark plug according to claim 3, wherein the upper portion of the center electrode is gradually tapered excessively to form a top end portion; the top end portion of the center electrode is the same as the diameter of the lower end portion of the negative electrode portion.
The spark plug according to claim 3, wherein the lower end portion is made of a base metal material; and the top end portion of the center electrode is also made of a base metal material.
The spark plug according to claim 1, wherein a plurality of air outlets are provided at a top of the housing of the negative firing unit.
The spark plug according to claim 1, wherein a plurality of exhaust gas outlets are provided on a side wall of the casing of the negative ignition unit.