Combustion chamber of hydrogen internal combustion engine

Abstract

The utility model discloses a combustion chamber of a hydrogen internal combustion engine, which is characterized in that the inner wall of the combustion chamber, which is positioned at a cylinder cover, consists of two inclined planes which are in opposite roof shapes and two spherical surfaces which are oppositely arranged, and the same sides of the two inclined planes are respectively connected with a spherical crown; the inclined plane is positioned on the inner wall of the cylinder cover; an intake valve, two exhaust valves and a spark plug are arranged on the cylinder cover; two intake valves are arranged on one inclined plane, and two exhaust valves are arranged on the other inclined plane; the spark plug is arranged at the position eccentric to one side of the exhaust valve relative to the central axis of the combustion chamber, the spark plug is parallel to the central axis of the combustion chamber, and the tail end of the spark plug extends into the combustion chamber. According to the utility model, mixed gas of hydrogen and air can be charged into an internal combustion engine cylinder through the intake valve to generate turbulent flow; and the in-cylinder hydrogen-air mixing effect and the in-cylinder turbulent vortex space-time distribution are enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of internal combustion engines, and in particular relates to a combustion chamber of a hydrogen internal combustion engine. Background Art

[0002] The cylinder head, cylinder wall and base of the hydrogen internal combustion engine are combined to form a combustion chamber. The top of the cylinder head is provided with an intake channel and an exhaust channel, and the intake end and the exhaust end are connected to the combustion chamber. The hydrogen internal combustion engine is also provided with a hydrogen injector. Hydrogen is used as a fuel and burns with an air / fuel mixture in the combustion chamber to generate a large amount of heat used as driving energy. The combustion chamber is a device in which fuel or propellant burns to generate high-temperature combustion gas. Others cannot work under high temperature, high load, variable working conditions, corrosive environment, combustion in high-speed airflow and lean oil mixture. In order to improve the performance of the engine, the existing technology mostly adopts the direct injection form of injecting fuel directly into the combustion chamber, and the combustion chamber mostly chooses a wedge-shaped structure with a large surface area ratio. Any slight changes in the design of the structure, volume, shape, position of the spark plug, etc. of the combustion chamber can significantly change the output power of the engine.

[0003] Hydrogen has a high calorific value, low specific heat, fast flame propagation speed, and is easy to ignite and burn. If hydrogen combustion is not well controlled, it will lead to rapid exothermic reaction and abnormal combustion. Therefore, it is considered to control the combustion speed of hydrogen fuel in the combustion chamber of the internal combustion engine by changing the shape and structural parameters of the combustion chamber to reduce NOx emissions. Utility Model Content

[0004] The purpose of the utility model is to provide a combustion chamber of a hydrogen internal combustion engine, which adopts an internal structure of a roof and a spherical crown, which is conducive to the generation of turbulent flow during the filling of hydrogen and air mixture (intake duct injection) or air (direct injection into the cylinder) into the cylinder of the internal combustion engine through the intake valve; enhances the hydrogen-air mixing effect in the cylinder and the temporal and spatial distribution of turbulent vortices in the cylinder, and organizes appropriate vortex intensity to effectively improve the mixing quality and combustion characteristics of the mixture of the hydrogen internal combustion engine.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A combustion chamber of a hydrogen internal combustion engine, wherein the inner wall of the combustion chamber located at the cylinder head is composed of two inclined planes in the shape of a roof on opposite sides and two spherical surfaces arranged oppositely, and the two inclined planes are both connected to a spherical surface on the same side; the inclined planes are located on the inner wall of the cylinder head, and the angle between the two inclined planes is 130°-150°; an intake valve, two exhaust valves and a spark plug are arranged on the two inclined planes; one of the inclined planes is provided with two intake valves, and the other inclined plane is provided with two exhaust valves; the spark plug is arranged at a position eccentric to the exhaust valve side relative to the central axis of the combustion chamber, and the spark plug is parallel to the central axis of the combustion chamber, and the end of the spark plug extends into the combustion chamber; and the relationship between the width L of the combustion chamber and the radius SR of the spherical surface is L / SR with a value range of 4 to 5, and the relationship between the spherical surface diameter D1 of the combustion chamber and the width L of the combustion chamber is D1 / L with a value range of 1.2-1.4.

[0007] Furthermore, the combustion chamber width L is 50-70 mm.

[0008] Furthermore, the diameter D1 of the spherical portion of the combustion chamber is 60-80 mm.

[0009] The utility model also discloses a hydrogen internal combustion engine utilizing the combustion chamber.

[0010] Compared with the prior art, the beneficial effects brought by the technical solution of the utility model are:

[0011] The combustion chamber of the hydrogen internal combustion engine of the utility model adopts an internal structure of a roof and a spherical crown, which is conducive to the generation of turbulent flow during the filling of hydrogen and air mixture (intake duct injection) or air (direct injection in the cylinder) into the cylinder of the internal combustion engine; the hydrogen-air mixing effect in the cylinder and the temporal and spatial distribution of the turbulent vortex in the cylinder are enhanced, and the organization of appropriate vortex intensity can effectively improve the mixing quality and combustion characteristics of the mixture of the hydrogen internal combustion engine. Moreover, the structure and the arrangement of the relative positions of its components enable the engine to achieve the best combustion efficiency and improve the output power. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front view of the combustion chamber of the hydrogen internal combustion engine of the utility model observed toward the cylinder head;

[0013] Figure 2 It is a cross-sectional view along the CC line of the combustion chamber of a hydrogen internal combustion engine;

[0014] Figure 3 is a cross-sectional view along line AA of a combustion chamber of a hydrogen internal combustion engine, and shows an intake pipe, an exhaust pipe and a spark plug;

[0015] Figure 4 It is a cross-sectional view along line BB of the combustion chamber of a hydrogen internal combustion engine.

[0016] In the figure:

[0017] 1: cylinder head; 2: intake valve; 3: exhaust valve; 4: spark plug; 51, 52: inclined plane; 61, 62: spherical surface. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme, beneficial effects and significant progress of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model is clearly and completely described below in combination with the drawings provided in the examples of the utility model. Obviously, all the described embodiments are only partial embodiments of the utility model, rather than all embodiments; based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0019] In the description of this application, unless otherwise clearly specified and limited, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; unless otherwise specified or explained, the terms "connected", "fixed", etc. should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0020] A hydrogen internal combustion engine comprises a cylinder head 1, a cylinder liner, a combustion chamber, an intake end, an outlet end and a hydrogen injector, wherein the hydrogen injector is located on the intake passage. Of course, according to actual conditions, it can also be arranged on the cylinder head for direct injection into the cylinder. The intake valve, the outlet valve and the spark plug 4 are all arranged on the cylinder head 1, and the end of the spark plug 4 extends into the combustion chamber. In addition, the intake valve and the outlet valve are also provided with an intake valve and an exhaust valve for controlling the connection and blocking between the intake port 2 and the exhaust port 3 and the combustion chamber.

[0021] like Figure 1-4 As shown, the combustion chamber of the hydrogen internal combustion engine is formed by a cylinder head 1, a cylinder liner and a piston, and the inner wall of the combustion chamber located at the cylinder head 1 is provided with two intake valves 2, two exhaust valves 3 and a spark plug 4. The inner wall of the combustion chamber located on the cylinder head includes two oppositely arranged and roof-shaped inclined planes 51, 52 and two oppositely arranged spherical surfaces 61, 62, and the two inclined planes intersect with a spherical surface on the same side, and the intersection is a spherical surface (i.e., without edges).

[0022] like Figure 1As shown, two intake valves 2, two exhaust valves 3 and spark plug 4 are all located on roof-shaped inclined planes 51, 52. Among them, two exhaust valves 3 are arranged on the inclined plane 51, two intake valves 2 are arranged on the inclined plane 52, and the intake and exhaust valves are arranged on both sides of the cylinder head respectively, forming a V shape. The spark plug 4 is arranged at a position eccentric to the exhaust valve 3 side than the central axis of the combustion chamber, and the central axis of the spark plug 4 is parallel to the central axis of the combustion chamber, and the end of the spark plug 4 extends into the combustion chamber.

[0023] The diameter of the intake valve 2 is greater than the diameter of the exhaust valve 3, and the diameter D1 of the spherical surface of the combustion chamber is 72 mm. Figure 4 As shown, the width L of the roof-shaped combustion chamber is 58 mm, and the angle of the combustion chamber roof surface is 140°, and the relationship between the width L of the roof-shaped combustion chamber and the radius SR of the phase crown sphere is L / SR=4-5.

[0024] Compared with spherical / hemispherical combustion chambers, the combustion chamber of the utility model is conducive to the generation of turbulent flow during the process of hydrogen and air mixture being charged into the cylinder of the internal combustion engine through the intake valve; enhancing the hydrogen-air mixing effect in the cylinder and the temporal and spatial distribution of turbulent vortices in the cylinder, and organizing appropriate vortex intensity can effectively improve the mixing quality and combustion characteristics of the mixture of the hydrogen internal combustion engine.

[0025] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A combustion chamber of a hydrogen internal combustion engine, characterized in that: The inner wall of the combustion chamber located at the cylinder head (1) is composed of two inclined planes (51, 52) in the shape of roofs on opposite sides and two spherical surfaces (61, 62) arranged opposite to each other, and the two inclined planes (51, 52) are both crown-connected to a spherical surface on the same side; the inclined planes (51, 52) are located on the inner wall of the cylinder head (1), and the included angle between the two inclined planes (51, 52) is 130°-150°; two intake valves (2), two exhaust valves (3) and a spark plug (4) are arranged on the two inclined planes (51, 52); Two intake valves (2) are arranged on one of the inclined planes, and two exhaust valves (3) are arranged on the other inclined plane; the spark plug (4) is arranged at a position eccentric to the exhaust valve (3) side relative to the central axis of the combustion chamber, and the spark plug is parallel to the central axis of the combustion chamber; and the end of the spark plug extends into the combustion chamber; and the relationship between the width L of the combustion chamber and the radius SR of the phase crown sphere is L / SR with a value range of 4 to 5, and the relationship between the spherical diameter D1 of the combustion chamber and the width L of the combustion chamber is D1 / L with a value range of 1.2-1.

4.

2. The combustion chamber of a hydrogen internal combustion engine according to claim 1, characterized in that: The combustion chamber width is 50-70 mm.

3. The combustion chamber of the hydrogen internal combustion engine according to claim 1, characterized in that: The diameter D1 of the spherical part of the combustion chamber is 60-80 mm.

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