CN213775577U

CN213775577U - Spark plug sheath integrated with pre-combustion chamber

Info

Publication number: CN213775577U
Application number: CN202022463736.6U
Authority: CN
Inventors: 王家祥; 金伟; 黄永仲; 李庆飞
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Marine and Genset Power Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-07-23
Anticipated expiration: 2030-10-30

Abstract

The utility model discloses a spark plug sheath of integrated precombustion chamber belongs to spark plug sheath field, solves the not good problem of traditional spark plug effect of igniteing. This spark plug sheath is including the sheath body that is used for installing the spark plug, the sheath body install on the engine cylinder head, spark plug bottom and the inner chamber bottom of sheath body between be formed with the precombustion chamber, just sheath body bottom center be equipped with the central jet orifice with the precombustion chamber intercommunication, the peripheral sheath body lateral wall of central jet orifice is equipped with a plurality of side jet orifices with the precombustion chamber intercommunication. The utility model discloses an integrated precombustion chamber spark plug sheath can improve the combustion chamber volume, and flame run through ability reinforce for combustion speed.

Description

Spark plug sheath integrated with pre-combustion chamber

Technical Field

The present invention relates to spark plug sheaths, and more particularly, to a spark plug sheath incorporating a pre-combustion chamber.

Background

With the emphasis of the country on environmental protection, the large-cylinder-diameter gas engine has wide application market prospect in the land power generation field and the ship field, the large-cylinder-diameter gas engine has a large amount of applications in the fields of methane power generation, oil field associated gas, natural gas stations and the like at present, the laminar combustion speed based on methane as a main fuel is slower, the combustion flame is spread farther in a combustion chamber after the cylinder diameter of the gas engine is increased, incomplete combustion exists in the combustion chamber, and the conditions of emission and economy of the large-cylinder-diameter gas engine are not facilitated, the passive pre-combustion chamber spark plug and the active pre-combustion chamber which solve the problem of rapid combustion through ignition are provided at present, one pre-combustion chamber is added at the head part of the common spark plug of the passive pre-combustion chamber spark plug, but the passive pre-combustion chamber spark plug has small volume, relatively weak flame penetration capacity and high cost, the mixing ratio of air and gas cannot be too high, the performance is improved better than ordinary ignition, and there is little and the cost is higher in the performance promotion, and initiative precombustion chamber redesigns precombustion chamber on replacing former spark plug sheath basis, has initiative air feed nozzle, precombustion chamber, spark plug in the initiative precombustion chamber, and the initiative precombustion chamber can promote combustion speed fast, and the performance promotion is showing, but the design degree of difficulty is big, and the cost is more expensive, and the maintenance cost is high.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is not enough to the above-mentioned of prior art, and its purpose provides the spark plug sheath of an integrated precombustion chamber, can improve the combustion chamber volume, and flame runs through the ability reinforce for combustion speed.

The technical scheme of the utility model is like this: the utility model provides an integrated precombustion chamber's spark plug sheath, is including the sheath body that is used for installing the spark plug, the sheath body install on the engine cylinder lid, spark plug bottom and the inner chamber bottom of sheath body between be formed with the precombustion chamber, just sheath body bottom center be equipped with the central jet orifice with the precombustion chamber intercommunication, the peripheral sheath body lateral wall of central jet orifice is equipped with a plurality of side jet orifices with the precombustion chamber intercommunication.

As a further improvement, the diameter of the central injection hole is 1 mm-6 mm.

Further, the diameter of the side injection hole is 1.2 mm-2.4 mm.

Furthermore, the side injection hole is an obliquely arranged injection hole, and the included angle between the axial lead of the side injection hole and the axial lead of the spark plug is 80-110 degrees.

Furthermore, the inner wall of the sheath body is provided with an inner limiting shoulder, and the supporting surface of the spark plug is lapped on the inner limiting shoulder.

Furthermore, the outer wall of the sheath body is provided with an outer limiting shoulder, and the outer limiting shoulder is lapped on a limiting surface of an engine cylinder cover.

Further, the distance from the outer limiting shoulder to the bottom surface of the sheath body is larger than the distance from the limiting surface to the bottom surface of the engine cylinder cover.

Further, the difference value between the distance from the outer limiting shoulder to the bottom surface of the sheath body and the distance from the limiting surface to the bottom surface of the engine cylinder cover is 5-20 mm.

Advantageous effects

Compared with the prior art, the utility model, have following advantage:

the utility model discloses an integrated precombustion chamber spark plug sheath, through this internal integrated precombustion chamber of sheath in the spark plug below, and set up the jet orifice respectively at sheath body bottom center and side, when getting into mixed gas in the engine cylinder, the precombustion chamber on the spark plug sheath is accomplished in step and is advanced mixed gas, the engine is admitted air and is accomplished the back, the spark plug is igniteed in the precombustion chamber, produce high temperature high pressure flame after mixed gas in the precombustion chamber catches fire, flame rethread central jet orifice and the high-speed blowout flame of side jet orifice, form combustion area on a large scale, can improve the combustion chamber volume, flame run through can be strong, accelerate combustion speed.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic sectional structure of the present invention;

fig. 3 is a schematic sectional structure diagram of the present invention.

Wherein: the spark plug comprises a spark plug 1, a sheath body 2, an engine cylinder cover 3, a pre-combustion chamber 4, a central jet hole 5, a lateral jet hole 6, an inner limiting shoulder 7, a support surface 8, an outer limiting shoulder 9 and a limiting surface 10.

Detailed Description

The invention will be further described with reference to specific embodiments shown in the drawings.

Referring to fig. 1-3, the utility model discloses an integrated precombustion chamber's spark plug sheath, including the sheath body 2 that is used for installing spark plug 1, spark plug 1's lower part and 2 threaded connection of sheath body, sheath body 2 is installed on engine cylinder lid 3, be formed with precombustion chamber 4 between spark plug 1 bottom and sheath body 2's inner chamber bottom, and sheath body 2 bottom center be equipped with precombustion chamber 4 intercommunication central jet orifice 5, central jet orifice 5 outlying sheath body 2 lateral walls are equipped with a plurality of side jet orifices 6 with 4 intercommunications of precombustion chamber, the quantity of side jet orifice 6 is 4 ~ 12, and their evenly distributed is at the lateral wall of sheath body 2.

The utility model discloses an integrated precombustion chamber spark plug sheath, through integrated precombustion chamber 4 in sheath body 2 of spark plug 1 below, and set up the jet orifice respectively in 2 bottom centers of sheath body and sides, when getting into mixed gas in the engine cylinder, precombustion chamber 4 on the spark plug sheath is accomplished in step and is advanced mixed gas, the engine admits air and accomplishes the back, spark plug 1 is igniteed in precombustion chamber 4, produce high temperature high-pressure flame after the mixed gas in precombustion chamber 4 catches fire, flame rethread

central jet orifice

5 and 6 high-speed blowout flames of side jet orifice, form combustion area on a large scale, can improve the combustion chamber volume, flame run through can the reinforce, accelerate combustion speed.

Preferably, the diameter of the central injection hole 5 is 1 mm-6 mm, and the diameter of the side injection hole 6 is 1.2 mm-2.4 mm, so that the penetration effect of the injection flame and the ventilation effect in the combustion chamber are ensured, and the combustion is smoother and more efficient.

Preferably, the side injection hole 6 is an obliquely arranged injection hole, and an included angle between an axial lead of the side injection hole 6 and an axial lead of the spark plug 1 is 80-110 degrees, so that the injected flame is prevented from burning the surface of the piston, and the combustion speed can be accelerated.

Preferably, an inner limiting shoulder 7 is provided on the inner wall of the jacket body 2, wherein the support surface 8 of the spark plug 1 overlaps the inner limiting shoulder 7 and serves to position the spark plug 1.

Preferably, an outer limiting shoulder 9 is arranged on the outer wall of the sheath body 2, and the outer limiting shoulder 9 is lapped on a limiting surface 10 of the engine cylinder head 3 to play a role in positioning the sheath body 2. Further, the distance from the outer limiting shoulder 9 to the bottom surface of the sheath body 2 is greater than the distance from the limiting surface 10 to the bottom surface of the engine cylinder head 3, so that the central injection hole 5 and the side injection hole 6 at the bottom of the sheath body 2 are exposed in the combustion chamber below the engine cylinder head 3, specifically, the difference between the distance from the outer limiting shoulder 9 to the bottom surface of the sheath body 2 and the distance from the limiting surface 10 to the bottom surface of the engine cylinder head 3 is 5-20 mm, and the sprayed flame can enter the combustion chamber and can be rapidly combusted.

The above is only the preferred embodiment of the present invention, and it should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which will not affect the utility model and the utility of the patent.

Claims

1. The spark plug sheath integrating the precombustion chamber comprises a sheath body (2) used for installing a spark plug (1), and the sheath body (2) is installed on an engine cylinder cover (3), and is characterized in that a precombustion chamber (4) is formed between the bottom of the spark plug (1) and the bottom of an inner cavity of the sheath body (2), a central jet hole (5) communicated with the precombustion chamber (4) is formed in the center of the bottom of the sheath body (2), a plurality of side jet holes (6) communicated with the precombustion chamber (4) are formed in the side wall of the sheath body (2) on the periphery of the central jet hole (5), the side jet holes (6) are obliquely arranged jet holes, and an included angle formed between the axial lead of the side jet holes (6) and the axial lead of the spark plug (1) is 80-110 degrees.

2. An integrated pre-combustion chamber spark plug boot as claimed in claim 1, characterized in that the diameter of the central injection hole (5) is 1mm to 6 mm.

3. An integrated pre-combustion chamber spark plug boot as claimed in claim 1, characterized in that the side injection holes (6) have a diameter of 1.2mm to 2.4 mm.

4. An integrated pre-combustion chamber spark plug boot as claimed in claim 1, characterized in that the inner wall of the boot body (2) is provided with an inner limit shoulder (7), and the support surface (8) of the spark plug (1) overlaps the inner limit shoulder (7).

5. An integrated pre-combustion chamber spark plug boot as claimed in any of claims 1-4, characterized in that the outer wall of the boot body (2) is provided with an outer limit shoulder (9), and the outer limit shoulder (9) is lapped on a limit surface (10) of the engine cylinder head (3).

6. An integrated pre-combustion chamber spark plug boot as claimed in claim 5, characterized in that the distance of the outer limit shoulder (9) to the bottom surface of the boot body (2) is greater than the distance of the limit surface (10) to the bottom surface of the engine cylinder head (3).

7. An integrated pre-combustion chamber spark plug boot as claimed in claim 6, characterized in that the difference between the distance from the outer limit shoulder (9) to the bottom surface of the boot body (2) and the distance from the limit surface (10) to the bottom surface of the engine head (3) is 5mm to 20 mm.