Pre-combustion chamber ignition device based on boss reinforced jet flow flame

Abstract

The invention relates to a pre-combustion chamber ignition device based on boss reinforced jet flame, which is characterized in that the motion direction of combustion flame in a pre-combustion chamber is guided through a boss designed at a jet hole of the pre-combustion chamber, so that the jet flame of the pre-combustion chamber is reinforced. The pre-combustion chamber is provided with a central axis, the multiple jet flow holes are evenly distributed around the central axis of the pre-combustion chamber, the sections of the jet flow holes include but not limited to a circle and a rectangle, and the edges of the jet flow holes are tangent to the edge of the boss. In the compression stroke of the internal combustion engine, mixed gas flows into the pre-combustion chamber through the jet flow hole and is guided by the boss to move vertically and upwards, more mixed gas can reach the top area of the pre-combustion chamber more quickly, and formation and ignition of the mixed gas with the accurate equivalence ratio are guaranteed; in the working stroke, the boss can occupy part of an airflow dead zone in the pre-combustion chamber, and meanwhile, the boss in the pre-combustion chamber can guide the propagation direction of combustion flames in a pre-combustion chamber cavity, so that the combustion flames are concentrated in the jet flow hole, and then the jet flow flames are strengthened.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of internal combustion engine, and particularly relates to a pre-chamber ignition device based on convex table reinforced jet flame. BACKGROUND

[0002] The pre-chamber jet ignition technology is a key technology capable of efficiently igniting high vaporization latent heat biofuel. The pre-chamber jet ignition technology principle is that during the compression stroke of the engine, the mixture in the main combustion chamber is compressed into the pre-chamber, or a small amount of fuel is injected into the pre-chamber through the oil injector, the former belongs to the passive pre-chamber, and the latter is the active pre-chamber. When the mixture in the pre-chamber is ignited by the spark plug, the temperature and pressure in the pre-chamber are rapidly increased, and under the action of the transient high pressure difference and temperature difference between the pre-chamber and the main combustion chamber, the flame and combustion products in the pre-chamber are injected into the main combustion chamber through the jet hole, forming a jet flame, and then igniting the combustible mixture in the main combustion chamber.

[0003] In the existing pre-chamber jet ignition technology, the bottom of the pre-chamber cavity is mostly flat or concave, and a flame jet dead zone is formed between the bottom of the pre-chamber cavity and the jet hole in the cavity, which affects the strengthening of the jet flame, and is more prone to residual exhaust gas, which is not conducive to the improvement of the engine's lean burn and overall performance. SUMMARY

[0004] The present application provides a pre-chamber ignition device based on convex table reinforced jet flame, which utilizes the guiding effect of the convex table on the inflowing mixture and the ejected flame to achieve the strengthening of the pre-chamber jet flame, thereby improving the engine performance and widening the fuel lean limit.

[0005] In order to solve the above technical problems, the present application provides a pre-chamber ignition device based on convex table reinforced jet flame, characterized in that: it comprises a pre-chamber cavity, the pre-chamber cavity is provided with a central axis (1), a plurality of jet holes (2) are uniformly distributed around the central axis (1), the bottom of the pre-chamber cavity is provided with a convex table (3), and the central axis of the convex table (3) coincides with the central axis (1) of the pre-chamber.

[0006] Further, the cross-sectional shape of the jet hole (2) is circular or rectangular.

[0007] Further, the convex table (3) is in the shape of a regular geometric body, and its shape is adapted and designed according to the shape and distribution of the jet hole (2).

[0008] Further, when the jet hole (2) is circular, the number thereof is 4-8, and the diameter is 1.5-3mm.

[0009] Further, when the jet hole (2) is rectangular, the number thereof is 4, the cross-sectional length is 4.5mm, and the width is 0.7mm.

[0010] Further, the boss (3) structure is suitable for active and passive pre-chamber.

[0011] Further, in the compression stroke, the boss (3) guides the mixture to move vertically upward, promoting the formation and ignition of the mixture at the top of the pre-chamber.

[0012] Further, in the power stroke, the boss (3) occupies the airflow dead zone in the pre-chamber cavity and guides the combustion flame to concentrate on the jet hole (2) to spray out, strengthening the jet flame.

[0013] Further, the jet hole (2) is single-layer or double-layer arranged, and the shape of the boss (3) is correspondingly adapted to the arrangement of the jet hole (2).

[0014] Further, the edge of the jet hole (2) is tangent to the edge of the boss (3).

[0015] Advantages:

[0016] (1) The pre-chamber ignition device based on boss-strengthened jet flame can guide the mixture flowing into the pre-chamber to flow vertically to the top of the pre-chamber spark plug in the compression stroke of the engine, so that the mixture in the pre-chamber can accurately reach the required equivalence ratio, and then nearly complete combustion is realized to release a large amount of heat.

[0017] (2) The pre-chamber ignition device based on boss-strengthened jet flame, the boss structure is suitable for active and passive pre-chamber ignition devices. Under the action of advantage (1), the boss structure is more remarkable in strengthening jet flame when used in passive pre-chamber.

[0018] (3) The pre-chamber ignition device based on boss-strengthened jet flame can guide the combustion flame to concentrate on the jet hole to spray into the main combustion chamber in the power stroke of the engine, so as to realize the strengthening effect on the jet flame. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Pre-chamber ignition device one (single-layer circular jet hole) schematic diagram;

[0020] Figure 2 Pre-chamber ignition device one (single-layer circular jet hole) cross-sectional view and compression stroke airflow schematic diagram;

[0021] Figure 3 Pre-chamber ignition device one (single-layer circular jet hole) cross-sectional view and power stroke airflow schematic diagram;

[0022] Figure 4(a), (b) are schematic diagram and cross-sectional view of pre-chamber ignition device two (double layer circular jet hole) respectively;

[0023] Figure 5 (a), (b) are schematic diagram and cross-sectional view of pre-chamber ignition device three (double layer circular jet hole) respectively;

[0024] Figure 6 (a), (b) are schematic diagram and cross-sectional view of pre-chamber ignition device four (single layer rectangular jet hole) respectively.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 1, center axis; 2, jet hole; 3, boss; 4, main combustion chamber mixture; 5, pre-chamber mixture; 6, pre-chamber combustion flame; 7, jet flame. DETAILED DESCRIPTION

[0027] In order to make the purpose, content and advantages of the present application more clear, the specific embodiments of the present application are described in further detail below.

[0028] As shown in the drawings, Figure 1 The present application proposes a pre-chamber ignition device based on boss reinforced jet flame, comprising a pre-chamber cavity, the pre-chamber cavity is provided with a center axis 1, a jet hole 2, and a boss 3;

[0029] The pre-chamber and the boss have the same center axis, the jet hole is a plurality of jet holes uniformly distributed around the center axis of the pre-chamber, the cross section of the jet hole includes but is not limited to circular and rectangular, and the edge of the jet hole is tangent to the edge of the boss.

[0030] The boss is located at the bottom of the pre-chamber cavity, has a regular shape, and the boss shape is different according to the shape and distribution of the jet hole.

[0031] The cavity of the pre-chamber is communicated with the main combustion chamber through the jet hole 2, the jet hole is used for flowing the mixture into the pre-chamber, and also used for jetting the flame into the main combustion chamber.

[0032] As shown in the drawings, Figure 2 During the compression stroke, the main combustion chamber mixture 4 flows into the pre-chamber through the jet hole 2, and the pre-chamber mixture 5 moves vertically upward under the guidance of the boss, which can reach the top area of the pre-chamber more quickly, thereby ensuring the formation and ignition of the accurate equivalent ratio mixture.

[0033] As shown in the drawings, Figure 3 During the working stroke, the boss occupies the dead zone area of the pre-chamber, and the boss can guide the propagation direction of the pre-chamber combustion flame 6, so that it is concentrated in the jet hole jet, and finally realizes the reinforcement of the jet flame 7 jetted out of the pre-chamber, improves the engine performance, and widens the fuel lean limit.

[0034] The optimized pre-chamber cavity bottom circular jet hole number is 4-8, and the jet hole diameter is 1.5-3 mm.

[0035] The optimized pre-chamber ignition device based on the boss reinforced jet flame is not limited to single-layer circular hole, but also can be double-layer circular hole jet hole (such as Figure 4 and 5 ), and different boss shapes are designed; also can be rectangular jet hole (such as Figure 6 ), the pre-chamber cavity bottom rectangular jet hole number is 4, and the cross section length and width are 4.5 mm and 0.7 mm respectively.

[0036] Figures 4 to 6 The different pre-chamber ignition device schematic diagram and sectional view are shown, and the working principle and process are the same as Figures 1 to 3 shown, and such boss structure is suitable for active pre-chamber and passive pre-chamber, and can be better suitable for different application background and different types of pre-chamber, reinforces the jet flame of pre-chamber, and improves the engine performance.

[0037] The above only is the preferred embodiment of the present application, it should be pointed out, for ordinary skilled in the art, without departing from the technical principles of the present application, can also make a number of improvements and deformation, these improvements and deformation also should be considered as the protection scope of the present application.

Claims

1. A prechamber ignition device based on a boss-strengthened jet flame, characterized by: The pre-chamber cavity is provided with a central axis (1), a plurality of jet holes (2) are uniformly distributed around the central axis (1), and the bottom of the pre-chamber cavity is provided with a boss (3), the central axis of the boss (3) coincides with the central axis (1) of the pre-chamber.

2. A pre-chamber ignition device according to claim 1, characterised in that: The cross-sectional shape of the jet hole (2) is circular or rectangular.

3. The prechamber ignition device of claim 1, wherein: The boss (3) is a regular geometric body, and its shape is designed according to the shape and distribution of the jet hole (2).

4. The prechamber ignition device of claim 2, wherein: When the jet hole (2) is circular, the number is 4-8, and the diameter is 1.5-3mm.

5. The prechamber ignition device of claim 2, wherein: When the jet hole (2) is rectangular, the number is 4, the cross-sectional length is 4.5mm, and the width is 0.7mm.

6. The prechamber ignition device of claim 1, wherein: The boss (3) structure is suitable for active pre-chamber and passive pre-chamber.

7. The prechamber ignition device of claim 1, wherein: In the compression stroke, the boss (3) guides the vertical upward movement of the mixture, promotes the formation and ignition of the mixture at the top of the pre-chamber.

8. The prechamber ignition device of claim 1, wherein: In the working stroke, the boss (3) occupies the airflow dead zone in the pre-chamber cavity, and guides the combustion flame to concentrate on the jet hole (2) to strengthen the jet flame.

9. A pre-chamber ignition device according to any one of claims 1-8, characterized in that: The jet hole (2) is single-layer or double-layer arranged, and the shape of the boss (3) is correspondingly adapted to the arrangement of the jet hole (2).

10. A pre-chamber ignition device according to claim 9, characterized in that: The edge of the jet hole (2) is tangent to the edge of the boss (3).

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