阅读说明：本技术 一种包含强湍流射流预燃室的汽油机点火机构 (Gasoline engine ignition mechanism containing strong turbulence jet flow precombustion chamber ) 是由 安彦召 赵德阳 裴毅强 陈涛 张帆 秦静 于 2021-08-18 设计创作，主要内容包括：本发明涉及一种包含强湍流射流预燃室的汽油机点火机构。汽油机点火机构包括：圆柱状的连接件,贯穿连接件上端面和下端面的喷油器安装孔,贯穿连接件上端面和下端面的火花塞安装孔,通过螺纹与连接件外周面相连接的预燃室,与喷油器安装孔配合工作的预燃室喷油器,与火花塞安装孔配合工作的预燃室火花塞；第二圆柱腔体下部有N组喷孔；每组喷孔包括一对相邻的锥状喷孔,分别是第一喷孔、第二喷孔；第一喷孔、第二喷孔的中心线相交于第二圆柱腔体的斜下方位置；本发明中,射流火焰自预燃室向主燃室射流的过程中,由于中心线相交的设计,必将汇聚和碰撞进而提高了射流火焰的湍流度。(The invention relates to a gasoline engine ignition mechanism comprising a strong turbulent jet flow precombustion chamber. The ignition mechanism of the gasoline engine comprises: the fuel injector comprises a cylindrical connecting piece, fuel injector mounting holes penetrating through the upper end face and the lower end face of the connecting piece, spark plug mounting holes penetrating through the upper end face and the lower end face of the connecting piece, a pre-combustion chamber connected with the peripheral face of the connecting piece through threads, a pre-combustion chamber fuel injector working in cooperation with the fuel injector mounting holes, and a pre-combustion chamber spark plug working in cooperation with the spark plug mounting holes; the lower part of the second cylindrical cavity is provided with N groups of spray holes; each group of spray holes comprises a pair of adjacent conical spray holes which are respectively a first spray hole and a second spray hole; the central lines of the first spray hole and the second spray hole are intersected at the inclined lower position of the second cylindrical cavity; in the invention, in the process of jetting the jet flame from the pre-combustion chamber to the main combustion chamber, the jet flame must be converged and collided due to the design of intersecting central lines, so that the turbulence degree of the jet flame is improved.)

1. A gasoline engine ignition mechanism incorporating a highly turbulent jet prechamber, comprising: the fuel injector comprises a cylindrical connecting piece (1), fuel injector mounting holes penetrating through the upper end face and the lower end face of the connecting piece, spark plug mounting holes penetrating through the upper end face and the lower end face of the connecting piece, a precombustion chamber (5) connected with the peripheral surface of the connecting piece through threads, a precombustion chamber fuel injector (4) working in cooperation with the fuel injector mounting holes, and a precombustion chamber spark plug (2) working in cooperation with the spark plug mounting holes;

the precombustion chamber is formed by combining three sections, namely a first cylindrical sleeve body (10), a conical sleeve body (11) and a second cylindrical cavity body (12) from top to bottom in sequence, wherein the inner diameter of the first cylindrical sleeve body is fixedly connected with the outer circumferential surface of the connecting piece through threads, the inner diameter of the second cylindrical cavity body is smaller than that of the first cylindrical sleeve body, and the conical sleeve body is just connected with the first cylindrical sleeve body and the second cylindrical cavity body; the lower end surface of the connecting piece, the inner wall of the conical sleeve body and the inner wall of the second cylindrical cavity enclose to form a pre-combustion chamber;

the lower part of the second cylindrical cavity is provided with N groups of spray holes, and N is more than or equal to 3; each group of spray holes comprises a pair of adjacent conical spray holes which are respectively a first spray hole (8) and a second spray hole (9); the shapes of the first spray hole and the second spray hole are conical, and the diameters of the holes are gradually reduced from the inside of the cavity to the outside of the cavity; the central lines of the first spray hole and the second spray hole are intersected at the inclined lower position of the second cylindrical cavity;

the central line of the oil sprayer mounting hole is vertical to the upper end surface and the lower end surface of the connecting piece; the center line of the spark plug mounting hole and the axis of the connecting piece are intersected in the second cylindrical cavity.

2. The ignition mechanism of a gasoline engine comprising a highly turbulent jet pre-combustion chamber as claimed in claim 1, wherein the first and second orifices are located at the intersection of the bottom surface and the circumferential surface of the second cylindrical cavity.

3. The ignition mechanism of the gasoline engine comprising the strong turbulent jet pre-combustion chamber as claimed in claim 1 or 2, wherein the plane formed by the central lines of the first and second jet holes is perpendicular to the bottom surface of the second cylindrical cavity.

The technical field is as follows:

the invention relates to an ignition mechanism of an internal combustion engine, and further relates to an ignition mechanism of a gasoline engine comprising a highly turbulent jet flow precombustion chamber.

Background art:

the active precombustion chamber engine adopts a lean combustion technology to improve the thermal efficiency of the engine, the conditions of fire breaking and the like are easily generated under the condition that the mixed gas in an engine cylinder is over lean, and the conditions of detonation and the like are more easily generated when the local flame is slowly spread, so that the jet flame can be ignited by utilizing the active precombustion chamber, a plurality of ignition points are formed in the main combustion chamber, and the combustion of the lean mixed gas is ensured. The main purpose of adopting the turbulent jet flame ignition mode of the pre-combustion chamber is to quickly ignite the thin mixed gas in the main combustion chamber of the engine, increase the turbulence of the jet flame and help to ignite the gas in the main combustion chamber more quickly and improve the speed of the jet flame for igniting the mixed gas in the main combustion chamber of the engine, thereby improving the constant volume degree of the combustion process of the engine. The conventional jet orifice only changes the turbulence degree of jet flame by adjusting parameters such as jet speed, jet aperture and the like, so that the turbulence degree of the jet flame is greatly limited.

The invention content is as follows:

the invention aims to provide a gasoline engine ignition mechanism comprising a strong turbulence jet flow precombustion chamber, which solves the problem of low turbulence degree of jet flow flame. In order to achieve the purpose, the invention provides the following technical scheme:

a gasoline engine ignition mechanism incorporating a highly turbulent jet prechamber comprising: the fuel injector comprises a cylindrical connecting piece 1, fuel injector mounting holes penetrating through the upper end face and the lower end face of the connecting piece, spark plug mounting holes penetrating through the upper end face and the lower end face of the connecting piece, a prechamber 5 connected with the peripheral face of the connecting piece through threads, a prechamber fuel injector 4 matched with the fuel injector mounting holes to work, and a prechamber spark plug 2 matched with the spark plug mounting holes to work;

the precombustion chamber is formed by combining three sections, namely a first cylindrical sleeve body 10, a conical sleeve body 11 and a second cylindrical cavity body 12 from top to bottom in sequence, wherein the inner diameter of the first cylindrical sleeve body is fixedly connected with the outer circumferential surface of the connecting piece through threads, the inner diameter of the second cylindrical cavity body is smaller than that of the first cylindrical sleeve body, and the conical sleeve body is just connected with the first cylindrical sleeve body and the second cylindrical cavity body; the lower end surface of the connecting piece, the inner wall of the conical sleeve body and the inner wall of the second cylindrical cavity enclose to form a pre-combustion chamber;

the lower part of the second cylindrical cavity is provided with N groups of spray holes, and N is more than or equal to 3; each group of spray holes comprises a pair of adjacent conical spray holes, namely a first spray hole 8 and a second spray hole 9; the shapes of the first spray hole and the second spray hole are conical, and the diameters of the holes are gradually reduced from the inside of the cavity to the outside of the cavity; the central lines of the first spray hole and the second spray hole are intersected at the inclined lower position of the second cylindrical cavity;

the central line of the oil sprayer mounting hole is vertical to the upper end surface and the lower end surface of the connecting piece; the center line of the spark plug mounting hole and the axis of the connecting piece are intersected in the second cylindrical cavity.

In a preferred embodiment, the first nozzle hole and the second nozzle hole are located at a junction between a bottom surface and a circumferential surface of the second cylindrical cavity.

Preferably, a plane formed by the center lines of the first nozzle hole and the second nozzle hole is perpendicular to the bottom surface of the second cylindrical cavity.

In the invention, in the process of jetting the jet flame from the pre-combustion chamber to the main combustion chamber, the jet flame must be converged and collided due to the design of intersecting central lines, so that the turbulence degree of the jet flame is improved.

Description of the drawings:

FIG. 1 is a cross-sectional view of an ignition mechanism in an embodiment of the present invention taken along an axial direction; in the figure, 1 denotes a connecting member, 2 denotes a pre-chamber plug, 3 denotes a pre-chamber plug gasket, 4 denotes a pre-chamber injector, 5 denotes a pre-chamber, 6 denotes a sealing gasket, 7 includes a pre-chamber plug electrode, 8 denotes a first nozzle hole, 9 denotes a second nozzle hole, 10 denotes a first cylindrical sleeve, 11 denotes a conical sleeve, and 12 denotes a second cylindrical cavity.

FIG. 2 is an enlarged partial cross-sectional view of the prechamber of FIG. 1; in the drawing, 8 denotes a first nozzle hole, and 9 denotes a second nozzle hole.

FIG. 3 is a schematic diagram showing the structure of the ignition mechanism of the present invention in cooperation with a cylinder in the embodiment; in the figure, 5 represents the prechamber, 13 represents the main combustion chamber of the engine, 14 represents the engine cylinder, and 15 represents the engine piston.

The specific implementation mode is as follows:

example (b):

a gasoline engine ignition mechanism incorporating a highly turbulent jet prechamber comprising: a cylindrical connecting piece 1, an oil sprayer mounting hole penetrating through the upper end surface and the lower end surface of the connecting piece, a spark plug mounting hole penetrating through the upper end surface and the lower end surface of the connecting piece, a prechamber cavity 5 connected with the peripheral surface of the connecting piece through threads, a prechamber oil sprayer 4 matched with the oil sprayer mounting hole for work, a prechamber spark plug 2 matched with the spark plug mounting hole for work, a spark plug gasket 3 and a sealing gasket 6,

the spark plug gasket realizes the sealing between the spark plug of the pre-combustion chamber and the connecting piece; the sealing gasket is made of red copper, so that the sealing between the connecting piece and the precombustion chamber is realized;

the precombustion chamber is formed by combining three sections, namely a first cylindrical sleeve body, a conical sleeve body and a second cylindrical cavity body from top to bottom in sequence, wherein the inner diameter of the first cylindrical sleeve body is fixedly connected with the outer circumferential surface of the connecting piece through threads, the inner diameter of the second cylindrical cavity body is smaller than that of the first cylindrical sleeve body, and the conical sleeve body is just connected with the first cylindrical sleeve body and the second cylindrical cavity body; the lower end surface of the connecting piece, the inner wall of the conical sleeve body and the inner wall of the second cylindrical cavity enclose to form a pre-combustion chamber; the central line of the oil sprayer mounting hole is vertical to the upper end surface and the lower end surface of the connecting piece; the central line of the spark plug mounting hole and the axis of the connecting piece are intersected in the second cylindrical cavity;

the lower part of the second cylindrical cavity is provided with 6 groups of spray holes; each group of spray holes comprises a pair of adjacent conical spray holes, namely a first spray hole 8 and a second spray hole 9, and the total number of spray holes is 12; the shapes of the first spray hole and the second spray hole are conical, and the diameters of the holes are gradually reduced from the inside of the cavity to the outside of the cavity; the central lines of the first spray hole and the second spray hole are intersected at the inclined lower position of the second cylindrical cavity; the plane formed by the central lines of the first spray hole and the second spray hole is vertical to the bottom surface of the second cylindrical cavity.

The jet flame is subjected to two-in one-out process in the process of jetting from the pre-combustion chamber to the main combustion chamber, so that two jet flames from the combustion chamber of the pre-combustion chamber are converged into one jet when reaching the main combustion chamber, and the two jet flames are converged and collided, so that the turbulence degree of the jet flames is improved.

The working process is as follows:

in the process of ascending of an engine piston 15 in a compression stroke, fresh charge in a main combustion chamber 13 of the engine enters a pre-combustion chamber 5 through a first spray hole 8 and a second spray hole 9, then a pre-combustion chamber fuel injector 4 injects fuel to form combustible mixed gas mixed by gasoline and air in the pre-combustion chamber, and then a pre-combustion chamber spark plug 2 ignites to ignite the mixed gas in the pre-combustion chamber;

the temperature and pressure in the precombustion chamber rise along with the combustion of the mixed gas, and when the pressure in the precombustion chamber is higher than that of the main combustion chamber 13 of the engine, the mixed gas in the precombustion chamber flows outwards through the first jet holes 8 and the second jet holes 9 to form jet flow; in the embodiment, the jet flow sprayed out of the first spray hole and the jet flow sprayed out of the second spray hole are gradually converged and collided at the tail ends and converged into the same beam when reaching the main combustion chamber, so that the turbulence degree of the jet flow flame is improved in the process of converging and colliding two beams of jet flow flames. The jet flame with high turbulence ignites the thin oil-gas mixture in the main combustion chamber of the engine.