阅读说明：本技术 一种包含螺旋气道预燃室的汽油机点火机构 (Gasoline engine ignition mechanism containing spiral air passage 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螺旋气道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,贯穿连接件上端面和下端面的一段螺旋气道；本发明中,由于螺旋气道的设计结构,当发动机主燃烧室内的新鲜充量通过射流喷孔进入预燃室同时,外部空气通过螺旋气道进入预燃室,并使预燃室内部形成垂直于预燃室轴线的旋流。(The invention relates to a gasoline engine ignition mechanism comprising a spiral air passage 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 precombustion chamber connected with the peripheral face of the connecting piece through threads, a precombustion chamber fuel injector matched with the fuel injector mounting holes for working, a precombustion chamber spark plug matched with the spark plug mounting holes for working, and a section of spiral air passage penetrating through the upper end face and the lower end face of the connecting piece; in the invention, due to the design structure of the spiral air passage, when fresh charge in the main combustion chamber of the engine enters the precombustion chamber through the jet flow spray hole, external air enters the precombustion chamber through the spiral air passage, and a rotational flow perpendicular to the axis of the precombustion chamber is formed in the precombustion chamber.)

1. An ignition mechanism for a gasoline engine including a spiral air path prechamber, comprising: the device comprises a cylindrical connecting piece (1), an oil sprayer mounting hole penetrating through the upper end face and the lower end face of the connecting piece, a spark plug mounting hole 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 oil sprayer (4) matched with the oil sprayer mounting hole to work, a precombustion chamber spark plug (2) matched with the spark plug mounting hole to work, and a section of spiral air passage penetrating through the upper end face and the lower end face of the connecting piece;

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 second cylindrical cavity body is not overlapped with the central line of the first cylindrical cavity body; the conical sleeve body is just connected with the first cylindrical sleeve body and the second cylindrical cavity; 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 spiral air passage provides air for the precombustion chamber independently, and the spiral central line of the spiral air passage is parallel to the central line of the second cylindrical cavity;

the lower part of the second cylindrical cavity is provided with N spray holes (8), wherein N is an integer greater than or equal to 3;

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 spiral air passage prechamber as recited in claim 1, wherein the nozzle is located at the intersection of the bottom surface and the circumferential surface of the second cylindrical cavity.

The technical field is as follows:

the invention relates to an ignition mechanism of an internal combustion engine, in particular to a gasoline engine ignition mechanism comprising a spiral air passage precombustion chamber.

Background art:

the precombustion chamber engine adopts the lean combustion technology to improve the engine thermal efficiency, and the condition such as the shut-off of catching fire is easily produced to the mixed gas under the excessive lean condition in the engine jar, and the condition such as knock is more easily produced when local flame spreads slowly, therefore can utilize the precombustion chamber to carry out jet flame ignition, form a plurality of ignition points in the main combustion chamber to guarantee the burning of lean mixture.

Because the space arrangement of the precombustion chamber is suitable for the gasoline engine, the waste gas in the precombustion chamber of the engine can not be completely discharged, air can not easily enter the precombustion chamber, and the small precombustion chamber space can not fully atomize the fuel injection in the precombustion chamber and mix the fuel injection with the air. In addition, the direction and the movement of the airflow in the precombustion chamber can only be controlled by the blowby gas of the main combustion chamber to the precombustion chamber through the jet flow nozzle, so that the strong rotational flow is difficult to form and the strong rotational flow cannot be utilized to promote the mixing of the oil mist and the air in the precombustion chamber.

The invention content is as follows:

the invention aims to provide a pre-combustion chamber air inlet structure with large rotational flow movement, and a gasoline engine ignition mechanism for promoting the mixing of oil mist and air in a pre-combustion chamber by utilizing strong rotational flow. In order to achieve the purpose, the invention provides the following technical scheme:

an ignition mechanism for a gasoline engine comprising a spiral air passage prechamber, comprising; the device comprises a cylindrical connecting piece 1, an oil sprayer mounting hole penetrating through the upper end face and the lower end face of the connecting piece, a spark plug mounting hole penetrating through the upper end face and the lower end face of the connecting piece, a prechamber 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 working, a prechamber spark plug 2 matched with the spark plug mounting hole for working, and a section of spiral air passage penetrating through the upper end face and the lower end face of the connecting piece;

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 second cylindrical cavity body is not overlapped with the central line of the first cylindrical cavity body; the conical sleeve body is just connected with the first cylindrical sleeve body and the second cylindrical cavity; 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 spiral air passage provides air for the precombustion chamber independently, and the spiral central line of the spiral air passage is parallel to the central line of the second cylindrical cavity;

the lower part of the second cylindrical cavity is provided with N precombustion chamber jet flow spray holes 8, and N is an integer greater than or equal to 3;

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.

Preferably, the jet nozzle of the precombustion chamber is located at the junction of the bottom surface and the circumferential surface of the second cylindrical cavity.

According to the invention, due to the design structure of the spiral air passage, when fresh charge in the main combustion chamber of the engine enters the precombustion chamber through the jet flow spray holes, external air enters the precombustion chamber through the spiral air passage, and a rotational flow perpendicular to the axis of the precombustion chamber is formed in the precombustion chamber; and simultaneously, the oil sprayer of the precombustion chamber sprays oil, and combustible mixed gas formed by mixing gasoline and air is formed in the precombustion chamber.

Description of the drawings:

FIG. 1 is a schematic view of the ignition mechanism in an embodiment of the present invention; in the figure, 9 represents a spiral air duct, 16 represents an air inlet position of the spiral air duct, and 17 represents an air outlet position of the spiral air duct.

FIG. 2 is a sectional view of the ignition mechanism in the axial direction in the embodiment of the present invention; in the figure, 1 represents a connecting member, 2 represents a pre-chamber spark plug, 3 represents a pre-chamber spark plug gasket, 4 represents a pre-chamber fuel injector, 5 represents a pre-chamber, 6 represents a sealing gasket, 7 represents a pre-chamber spark plug electrode, 8 represents a pre-chamber jet orifice, 10 represents a first cylindrical sleeve, 11 represents a conical sleeve, and 12 represents a second cylindrical cavity.

FIG. 3 is a schematic view of the structure of FIG. 1 in a top view; in the figure, 9 represents a spiral air duct, 16 represents an air inlet position of the spiral air duct, and 17 represents an air outlet position of the spiral air duct.

FIG. 4 is a schematic diagram showing the structure of the ignition mechanism of the present invention after being engaged 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):

an ignition mechanism for a gasoline engine comprising a spiral air passage prechamber, comprising; the device comprises a cylindrical connecting piece 1, an oil sprayer mounting hole penetrating through the upper end face and the lower end face of the connecting piece, a spark plug mounting hole penetrating through the upper end face and the lower end face of the connecting piece, a prechamber cavity 5 connected with the peripheral face of the connecting piece through threads, a prechamber oil sprayer 4 working in cooperation with the oil sprayer mounting hole, a prechamber spark plug 2 working in cooperation with the spark plug mounting hole, a spark plug gasket 3, a sealing gasket 6 and a section of spiral air passage penetrating through the upper end face and the lower end face of the connecting piece;

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 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 second cylindrical cavity body is not overlapped with the central line of the first cylindrical cavity body; the conical sleeve body is just connected with the first cylindrical sleeve body and the second cylindrical cavity; 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 spiral air passage provides air for the precombustion chamber independently, and the spiral central line of the spiral air passage is parallel to the central line of the second cylindrical cavity;

the central line of the spark plug mounting hole and the axis of the connecting piece are intersected in the second cylindrical cavity;

the jet flow spray holes of the precombustion chamber are positioned at the junction of the bottom surface and the circumferential surface of the second cylindrical cavity, and 6 jet flow spray holes are distributed in one circle.

The working process is as follows:

during the compression stroke and the upward movement of the engine piston 15, fresh charge in the main combustion chamber 13 of the engine enters the prechamber 5 through the jet nozzle 8 of the prechamber, and simultaneously fresh air enters the prechamber at the air inlet position 16 of the spiral air passage, passes through the spiral air passage 9 and enters the prechamber at the air inlet position 17 of the spiral air passage, and forms a rotational flow perpendicular to the axis of the prechamber inside the prechamber. Simultaneously, the pre-combustion chamber oil sprayer 4 sprays oil, combustible mixed gas formed by mixing gasoline and air is formed in the pre-combustion chamber 5, and then the 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 jet flow jet holes 8 of the precombustion chamber to form jet flow; igniting the mixture in the main combustion chamber.