Inclined intake valve and hydrogen internal combustion engine

Abstract

The utility model relates to the field of parts of a hydrogen internal combustion engine, in particular to an inclined type intake valve and the hydrogen internal combustion engine. An included angle is formed between the axis of a valve rod of the inclined type intake valve and the normal of a valve head; a spark plug is arranged on the cylinder wall of a combustion chamber of the hydrogen internal combustion engine, an inclined intake valve and an exhaust valve are arranged on the two sides of the spark plug respectively, and an intake groove matched with the inclined intake valve is formed in the cylinder wall of the hydrogen internal combustion engine. The inclined air inlet valve and the air inlet groove incline from the side close to a spark plug and / or facing an exhaust valve to the side close to the side cylinder wall of the combustion chamber of the gas turbine. Compared with the prior art, the direction of inlet air flow is guided and controlled by changing the included angle between the valve rod and the valve face, the inlet air flow is guided in the direction away from one side of a spark plug and an exhaust valve, combustible mixed gas is prevented from being ignited by hot spots at the spark plug or the exhaust valve, and the abnormal combustion phenomenon is effectively controlled.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydrogen internal combustion engine parts field especially tilt formula intake valve and hydrogen internal combustion engine. BACKGROUND

[0002] The abnormal combustion phenomenon of hydrogen engine mainly includes pre-ignition, backfire and knock. The pre-ignition refers to the phenomenon that fresh charge contacts some hot spots (such as spark plug, exhaust valve and carbon deposit) in the local high temperature of combustion chamber to cause combustion when the fresh charge is not ignited by the spark plug. The pre-ignition usually occurs near the intake valve, if the pre-ignition occurs far from the intake valve, the knocking phenomenon may occur. The pre-ignition will cause low engine efficiency, rough operation, increase the mechanical load and thermal load of the engine, and increase the exhaust temperature. The backfire refers to the abnormal combustion phenomenon that the mixed gas in the cylinder is ignited by the hot spot without being ignited by the spark plug when the intake valve is not closed during the intake process. The backfire will cause the hydrogen engine to work abnormally, reduce the power, and deteriorate the economy. In severe cases, the engine may even stall and damage the hydrogen supply system. The knock refers to the sudden abnormal combustion in the engine, which causes the engine to shake violently, and even the cylinder of the engine may be damaged in severe cases.

[0003] As disclosed in Chinese patent application CN201310156081.X, to solve the above problems, the commonly used scheme in the prior art is to place the intake and exhaust valves obliquely, so that the axis of the intake valve and the axis of the exhaust valve form a certain angle, to reduce the resistance of the gasoline engine valve intake and exhaust, thereby improving the combustion efficiency of the mixed gas in the combustion chamber. However, the current scheme of oblique exhaust valve still has the problems of turbulence and vortex during the intake process, uneven concentration and temperature of the mixed gas in the combustion chamber, and abnormal combustion phenomena such as pre-ignition and backfire. SUMMARY

[0004] The utility model aims at overcoming the defects of turbulence and vortex during the intake process and uneven concentration and temperature of the mixed gas in the combustion chamber in the prior art, and provides a tilt formula intake valve and hydrogen internal combustion engine.

[0005] The purpose of the utility model can be realized by the following technical schemes:

[0006] As a first aspect of the utility model, a tilt formula intake valve is provided, and the axis of the valve rod and the normal line of the valve head form an angle.

[0007] As a preferred technical scheme, the angle between the axis of the valve rod and the normal line of the valve head is 4-20°.

[0008] As a preferred technical scheme, the angle between the axis of the valve rod and the normal line of the valve head is 8.5°.

[0009] As a second aspect of the utility model, a hydrogen internal combustion engine is provided, a spark plug is arranged on the cylinder wall of the combustion chamber of the hydrogen internal combustion engine, an intake valve and an exhaust valve are arranged on the two sides of the spark plug, the intake valve adopts the inclined intake valve as described above, and the cylinder wall of the hydrogen internal combustion engine is provided with an air inlet groove matched with the inclined intake valve.

[0010] As a preferred technical scheme, the air inlet groove is arranged in a direction inclined from the side close to the spark plug and / or towards the exhaust valve to the side close to the side cylinder wall of the combustion chamber.

[0011] As a preferred technical scheme, the air inlet groove is recessed into the cylinder wall from the side close to the spark plug and / or towards the exhaust valve, and is flush with the inner surface of the cylinder wall from the side close to the side wall of the combustion chamber.

[0012] As a preferred technical scheme, the valve stem of the inclined intake valve is perpendicular to the cylinder wall of the combustion chamber and movably arranged on the cylinder wall of the combustion chamber, and the valve head of the inclined intake valve is arranged in the air inlet groove.

[0013] As a preferred technical scheme, the air inlet groove is arranged in a direction inclined from the side close to the spark plug and / or towards the exhaust valve to the side close to the side cylinder wall of the combustion chamber.

[0014] As a preferred technical scheme, the valve stem of the exhaust valve is perpendicular to the valve head.

[0015] As a preferred technical scheme, the valve stem of the exhaust valve is perpendicular to the cylinder wall of the combustion chamber and movably arranged on the cylinder wall of the combustion chamber, the valve head of the exhaust valve is arranged on the inner side of the cylinder wall, the normal line of the valve head is parallel to the cylinder wall, and the valve head is attached to the cylinder wall when the exhaust valve is closed.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1) The inclined intake valve of the hydrogen internal combustion engine can realize the guidance and control of the direction of the intake air flow by changing the included angle between the valve stem and the valve face, can change the flow direction of the combustible mixed gas, avoid the generation of turbulent flow and vortex flow in the intake process, reduce abnormal combustion phenomena such as early combustion, backfire and knock of the hydrogen internal combustion engine, and promote the performance of the hydrogen internal combustion engine.

[0018] 2)The utility model also provides a hydrogen internal combustion engine with inclined air inlet valve, hydrogen internal combustion engine operation process, air inlet valve surface and exhaust valve surface are not coplanar. The air inlet valve and the air inlet groove set up in the inner side of the combustion chamber cylinder wall cooperate, guide the intake air flow to the direction far from the spark plug and the exhaust valve side, make the combustion chamber mixed gas concentration more uniform, prevent the hot spot at the spark plug or exhaust valve ignites the combustible mixture. And can strengthen the gas flow near the cylinder wall surface, reduce the surface temperature of the cylinder wall surface, control the abnormal combustion phenomenon. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the front view of a hydrogen internal combustion engine inclined air inlet valve of the utility model;

[0020] Figure 2 It is the top view of a hydrogen internal combustion engine inclined air inlet valve of the utility model;

[0021] Figure 3 It is the structure schematic diagram of a hydrogen internal combustion engine with inclined air inlet valve of the utility model;

[0022] Figure 4 It is the structure schematic diagram of the exhaust valve of the hydrogen internal combustion engine in the utility model;

[0023] The figure mark shows: 101, cylinder wall, 102, inclined air inlet valve, 103, spark plug, 104, exhaust valve. DETAILED DESCRIPTION

[0024] The utility model will be explained in detail below in combination with the drawings and specific embodiment. The embodiment is implemented under the premise of the technical scheme of the utility model, gives detailed implementation mode and specific operation process, but the protection scope of the utility model is not limited to the following examples.

[0025] It should be noted that: similar signs and letters show similar items in the following drawings, therefore, once an item is defined in a drawing, it does not need to be further defined and explained in the subsequent drawings.

[0026] The utility model will be explained in detail below in combination with the drawings and specific embodiment. The embodiment is implemented under the premise of the technical scheme of the utility model, gives detailed implementation mode and specific operation process, but the protection scope of the utility model is not limited to the following examples.

[0027] Example 1

[0028] As one of the implementation modes of the utility model, a hydrogen internal combustion engine inclined air inlet valve is provided. As shown in Figures 1-2As shown, the valve rod axis and the valve head normal line form an angle, so that the valve rod is not perpendicular to the valve face. Specifically, the angle between the valve rod axis and the valve head normal line is 4-20°. Among them, preferably, the angle between the valve rod axis and the valve head normal line in the embodiment is 8.5°.

[0029] The inclined intake valve described above can realize the guidance control of the intake air flow direction by changing the angle between the valve rod and the valve face, can change the flow direction of the combustible mixture, can reduce abnormal combustion phenomena such as early combustion, backfire, knock and the like of the hydrogen internal combustion engine, and can promote the performance of the hydrogen internal combustion engine.

[0030] Embodiment 2

[0031] As another embodiment of the utility model, the embodiment further provides a hydrogen internal combustion engine with an inclined intake valve. Figure 3 As shown, the top end of the hydrogen internal combustion engine combustion chamber is provided with a spark plug 103, and the two sides of the spark plug 103 are respectively provided with an inclined intake valve 102 and an exhaust valve 104.

[0032] The intake valve of the hydrogen internal combustion engine adopts the inclined intake valve 102 described in embodiment 1, and the cylinder wall 101 is provided with an intake groove matched with the inclined intake valve 102. The valve rod of the inclined intake valve 102 is vertically movably arranged on the cylinder wall 101 of the combustion chamber, the valve head is arranged in the matched inclined intake groove, and when the intake valve is closed, the inclined intake valve 102 is matched with the inclined inner wall in the intake groove.

[0033] Specifically, the inclined direction of the inclined intake valve 102 and the intake groove is: from one side towards the spark plug 103 and / or the exhaust valve 104 to one side towards the side wall 101 of the internal combustion engine combustion chamber. The side of the intake groove towards the spark plug 103 and / or the exhaust valve 104 is recessed inward, closer to the top of the cylinder, and the side towards the side wall of the internal combustion engine combustion chamber is flush with the inner surface of the combustion chamber cylinder wall 101.

[0034] The inclined intake valve provided by the utility model realizes the guidance control of the intake air flow direction by forming a slanting intake passage between the inclined intake valve 102 and the matched intake groove when the intake valve is opened, guides the intake air flow to the direction away from the side of the spark plug and the exhaust valve, prevents the hot spot at the spark plug or the exhaust valve from igniting the combustible mixture, and strengthens the gas flow near the cylinder wall surface, reduces the surface temperature of the cylinder wall surface, and realizes the control of abnormal combustion phenomena.

[0035] As shown in the figure, Figure 4As shown, the valve stem axis of the exhaust valve 104 is perpendicular to the valve head normal. The valve stem of the exhaust valve 104 is vertically movably arranged on the cylinder wall 101 of the combustion chamber, the valve head is arranged on the inner side of the cylinder wall 101, and the valve head normal is parallel to the cylinder wall 101, and the valve head is in close contact with the cylinder wall 101 when the exhaust valve 104 is closed.

[0036] The utility model discloses a through the accurate control of intake air flow path, the optimization design can ensure that hydrogen and air mix more evenly, effectively avoid the abnormal combustion phenomenon such as early combustion, backfire caused by local overheating and mixed gas concentration uneven. At the same time, the optimized intake system can also reduce the turbulence and vortex in the intake process, reduce the ignition risk of mixed gas by the high-temperature exhaust gas near the intake valve, thereby significantly improve the operation stability and safety of hydrogen engine. In addition, the reasonable intake system design can also improve the charging efficiency of the engine, ensure that the hydrogen engine plays the best performance in the efficient and clean combustion process. As an important part of the intake system, the optimization design of the intake valve is the key link to solve the abnormal combustion problem of the hydrogen engine and promote the development of hydrogen energy power technology.

[0037] The above detailed the preferred embodiment of the utility model. It should be understood that ordinary skilled in the art can make many modifications and changes according to the conception of the utility model without creative labor. Therefore, all the technical solutions that the skilled in the art can obtain by logical analysis, reasoning or limited experiment on the basis of the prior art according to the conception of the utility model should be within the protection scope determined by the claims.

Claims

1. A tilt intake valve characterized by, The door rod axis of the inclined intake valve forms an angle with the normal line of the valve head.

2. A tilting intake valve according to claim 1, characterized in that The angle between the valve rod axis and the normal line of the valve head is 4-20°.

3. A tilting intake valve according to claim 2, wherein The angle between the valve rod axis and the normal line of the valve head is 8.5°.

4. A hydrogen internal combustion engine, the combustion chamber cylinder wall (101) of the hydrogen internal combustion engine is provided with a spark plug (103), and the two sides of the spark plug (103) are provided with an intake valve and an exhaust valve (104), characterized in that, The intake valve adopts the inclined intake valve (102) according to any one of claims 1-3, and the cylinder wall (101) of the hydrogen internal combustion engine is provided with an air inlet groove matched with the inclined intake valve (102).

5. A hydrogen internal combustion engine according to claim 4, characterized by The air inlet groove is arranged to be inclined from the side close to the spark plug (103) and / or towards the exhaust valve (104) to the side close to the combustion chamber side wall (101).

6. A hydrogen internal combustion engine according to claim 5, wherein The air inlet groove is recessed into the cylinder wall (101) from the side close to the spark plug (103) and / or towards the exhaust valve (104), and is flush with the inner surface of the combustion chamber cylinder wall (101) from the side close to the combustion chamber side wall.

7. A hydrogen internal combustion engine according to any one of claims 5-6, characterized in that, The valve rod of the inclined intake valve (102) is perpendicular to the combustion chamber cylinder wall (101) and movably arranged on the combustion chamber cylinder wall (101), and the valve head of the inclined intake valve (102) is arranged in the air inlet groove.

8. A hydrogen internal combustion engine according to claim 7, characterized by The inclined intake valve (102) is arranged to be inclined from the side close to the spark plug (103) and / or towards the exhaust valve (104) to the side close to the combustion chamber side wall (101).

9. A hydrogen internal combustion engine according to claim 4, characterized by The valve rod of the exhaust valve (104) is perpendicular to the valve head.

10. A hydrogen internal combustion engine according to claim 9, wherein The valve rod of the exhaust valve (104) is perpendicular to the combustion chamber cylinder wall (101) and movably arranged on the combustion chamber cylinder wall (101), the valve head of the exhaust valve (104) is arranged on the inner side of the cylinder wall (101), the normal line of the valve head is parallel to the cylinder wall (101), and the valve head is in close contact with the cylinder wall (101) when the exhaust valve (104) is closed.

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