Straight inclined cross-cylinder straight air channel cylinder cover and gas engine

Abstract

The invention relates to the technical field of natural gas engine cylinder covers, and discloses a straight-inclined cross-cylinder straight-air-channel cylinder cover and a gas engine, the straight-inclined cross-cylinder straight-air-channel cylinder cover comprises a flat-top cylinder cover, two exhaust channels, a first air inlet channel and a second air inlet channel, and the air inlet ends of the two exhaust channels communicate with the cylinder cover; the first air inlet channel and the second air inlet channel are tumble flow channels, the air outlet end of the first air inlet channel and the air outlet end of the second air inlet channel are communicated with the cylinder cover, a first center face passing through the axis of the cylinder cover is formed between the first air inlet channel and the two exhaust channels and between the second air inlet channel and the two exhaust channels, the first air inlet channel is perpendicular to the first center face, and the second air inlet channel inclines relative to the first center face. The distance between the first air inlet channel and the second air inlet channel is gradually increased in the direction away from the cylinder cover. According to the straight inclined cross-cylinder straight air channel cylinder cover, tumble and vortex can be generated in the cylinder at the same time, turbulence energy in the cylinder is improved, the vortex can accelerate combustion in the later period of combustion to a certain degree, and therefore the ignition delay period is shortened through the tumble, and the combustion duration is shortened through the vortex.

Description

Technical Field

[0001] The invention relates to the technical field of gas engine cylinder heads, and in particular to a straight-inclined cross-cylinder straight-airway cylinder head and a gas engine. Background Art

[0002] Heavy-duty gas engines are ignition-type internal combustion engines, similar to gasoline engines. Their combustion form determines the need to organize a certain intensity of tumble flow in the cylinder.

[0003] However, most of the heavy-duty gas engines (including natural gas and hydrogen) at home and abroad in the National VI stage are modified from diesel engines. The intake duct is a vortex air duct. The turbulent kinetic energy in the cylinder is low at the time of ignition. At the same time, large-scale vortexes will increase the tendency of knock, which is not conducive to improving thermal efficiency. In addition, there are also dome tumble air ducts that use gasoline engines to form strong tumble flows in the cylinder, but strong tumble flows may lead to increased cycle variations, affecting the stability and durability of the engine. Summary of the invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and to propose a straight inclined cross-cylinder straight airway cylinder head and a gas engine, so as to solve the technical problem that the use of turbine airways or tumble airways in the prior art affects the performance of the gas engine.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a straight inclined cross-cylinder straight airway cylinder head, comprising: Flat top cylinder head; Two exhaust passages, the air inlet ends of the two exhaust passages are connected to the cylinder head and are arranged on one side of the cylinder head; and The first intake duct and the second intake duct are tumble flow ducts, the outlet ends of the first intake duct and the second intake duct are both connected to the cylinder head and are arranged on the other side of the cylinder head, a first center plane passing through the axis of the cylinder head is formed between the first intake duct and the second intake duct and the two exhaust ducts, the first intake duct is perpendicular to the first center plane, the second intake duct is inclined relative to the first center plane, and the distance between the first intake duct and the second intake duct gradually increases in the direction away from the cylinder head.

[0006] In one embodiment, the first air intake passage and the second air intake passage both have a first inclined air passage, an arc guide air passage and a second inclined air passage that are sequentially connected along a direction approaching the cylinder head, and the slope of the first inclined air passage is smaller than the slope of the second inclined air passage.

[0007] In one embodiment, there is a second center plane between the first intake passage and the second intake passage, which passes through the axis of the cylinder head and is perpendicular to the first center plane; In the projection of the first air inlet passage and the second air inlet passage on the second central plane, the first air inlet passage and the second air inlet passage have a first straight line segment, a first arc segment and a second straight line segment connected in sequence on one side close to the cylinder head, the angle θ2 between the first straight line segment and the top surface of the cylinder head is in the range of 0° to 15°, the angle R1 of the first arc segment is in the range of 80 mm to 100 mm, and the angle θ1 between the second straight line segment and the top surface of the cylinder head is in the range of 40° to 60°; The first and second air inlet passages have a third straight line segment, a second arc segment and a fourth straight line segment connected in sequence on the side away from the cylinder head, the angle θ4 between the third straight line segment and the top surface of the cylinder head is in the range of 20° to 40°, the angle R2 of the second arc segment is in the range of 80 mm to 100 mm, and the angle θ3 between the fourth straight line segment and the top surface of the cylinder head is in the range of 30° to 50°.

[0008] In one embodiment, the two exhaust passages are arranged in parallel and at intervals.

[0009] In one embodiment, the connection point between the first intake duct and the cylinder head and the connection point between one exhaust duct and the cylinder head are symmetrically distributed along the second center plane, and the connection point between the second intake duct and the cylinder head and the connection point between the other exhaust duct and the cylinder head are symmetrically distributed along the second center plane.

[0010] In one embodiment, the second intake passage is in a straight line shape in the projection of the top surface of the cylinder head.

[0011] In a second aspect, the present invention further provides a gas engine, comprising the above-mentioned straight inclined cross-cylinder straight airway cylinder head.

[0012] In one embodiment, the gas engine has a plurality of straight-inclined cross-cylinder straight-channel cylinder heads, two adjacent second intake ducts in adjacent straight-inclined cross-cylinder straight-channel cylinder heads share an intake port, and the side walls of the intake ends of the two second intake ducts are provided with openings connecting the two second intake ducts.

[0013] In one embodiment, the gas engine further comprises a combustion chamber matched with the cylinder head, wherein the combustion chamber is cylindrical on one side close to the cylinder head, and the inner wall and outer wall of the combustion chamber away from the cylinder head are spherical.

[0014] Compared with the prior art, the straight-inclined cross-cylinder straight-airway cylinder head and the gas engine provided by the present invention, when the mixed gas enters the cylinder, the mixed gas first enters the intake manifold, and then enters the first intake passage and the second intake passage through the intake manifold. Since the first intake passage adopts a tumble flow passage and is perpendicular to the first center plane, after the mixed gas enters the cylinder through the first intake passage, a rotation motion in the vertical direction is formed in the cylinder to generate a tumble flow, and the axis of the tumble flow is perpendicular to the axis of the cylinder; in the process of the mixed gas entering the cylinder through the second intake passage, since the second intake passage is a tumble flow passage and is inclined relative to the first center plane, the mixed gas has two vertical motion components on the intake side of the cylinder, and the mixed gas passes through the second intake passage. After entering the cylinder, tumble and vortex will be formed in the cylinder, so that tumble and vortex are generated in the cylinder at the same time. Compared with the general pure tumble airway, the tumble formed in the cylinder by the structural design of the airway in the present invention can be generated simultaneously in the X and Y vertical directions on the intake and exhaust sides of the engine, which will increase the turbulent kinetic energy in the cylinder and make full use of the airflow organization for combustion; on the other hand, a certain degree of vortex can accelerate combustion in the later stage of combustion, thereby shortening the ignition delay period by tumble, reducing the combustion duration by vortex, comprehensively accelerating the combustion speed, making full use of the compression energy before the top dead center, and effectively improving the thermal efficiency; at the same time, the combination of tumble and turbine can reduce the impact of a single tumble or a turbine that is too large on the performance of the gas engine.

[0015] The design of dual intake ducts matched with dual exhaust ducts is conducive to smooth airflow organization, increasing the tumble ratio, making full use of turbulent kinetic energy and accelerating the combustion speed.

[0016] The straight inclined cross-cylinder straight airway cylinder head of the present invention adopts a flat-top cylinder head, which can be shared with the diesel engine cylinder head production and assembly line, with small initial manufacturing investment, and can make full use of existing resources without large-scale investment. Keeping the cylinder head boundary conditions unchanged, by optimizing the structure and layout of the two intake ducts, organizing the tumble and vortex in the cylinder, increasing the turbulent kinetic energy in the cylinder, accelerating the flame propagation speed, accelerating combustion, and thus improving the thermal efficiency of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a cylinder head with straight inclined cross-cylinder straight airway provided by one embodiment of the present invention; Figure 2 It is a structural schematic diagram of a cylinder head with an arc-shaped centering cross-cylinder straight air passage provided by an embodiment of the present invention when the air inlet in the cylinder head with an adjacent cross-cylinder straight air passage is connected; Figure 3 It is a structural schematic diagram of a cylinder head with an arc-shaped center-cross-cylinder straight airway provided by an embodiment of the present invention; Figure 4 It is a schematic structural diagram of a cylinder head with an arc-shaped center-cross-cylinder straight air passage provided by an embodiment of the present invention.

[0018] Description of reference numerals: Cylinder head 1; exhaust passage 2; first intake passage 3; second intake passage 4; first center plane 5; second center plane 6; intake port 7; combustion chamber 8. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] At present, natural gas engines are mainly modified and matched based on the existing diesel engine platform. One of the key components, the cylinder head, usually retains the structure of the original diesel engine's vortex cylinder head. This design method aims to utilize mature diesel engine technology to reduce development costs and time; but this means that the airway also retains the vortex airway. The vortex airway has low turbulent kinetic energy in the cylinder during ignition, and large-scale vortices will increase the tendency of knocking, which is not conducive to improving thermal efficiency.

[0021] Natural gas engines are spark-ignited, just like gasoline engines, and gasoline engines all have dome tumble flow passages. Tumble flow is a rotational motion perpendicular to the cylinder axis. This motion is crushed by the piston at the top dead center and is highly unstable, but it can increase the turbulent kinetic energy in the cylinder and help improve the combustion process. However, there are problems with the use of dome tumble flow passages. The dome tumble flow passages cause the valve to be tilted. After the valve is tilted, the engine cannot be remodeled based on the diesel engine. At the same time, a new cylinder head processing line and engine assembly line need to be built, and the initial investment in industrialization is huge. In addition, the tumble flow generated by the dome is relatively large, and strong tumble flow may lead to increased cycle changes, affecting the stability and durability of the engine.

[0022] In order to solve the technical problem that the use of turbine air ducts or tumble air ducts affects the performance of gas engines, the present invention provides a straight-inclined cross-cylinder straight air duct cylinder head and a gas engine, which can solve the problem that the use of turbine air ducts or tumble air ducts in the prior art affects the performance of gas engines.

[0023] It should be noted that the straight-inclined cross-cylinder straight-air channel cylinder head described in the present invention is used for but not limited to gas engines, etc. For the convenience of explanation, in the present invention, only the straight-inclined cross-cylinder straight-air channel cylinder head applied to a gas engine is used as an example for explanation, and the principle of applying the straight-inclined cross-cylinder straight-air channel cylinder head to other types of equipment is essentially the same as the principle applied to the gas engine, which will not be repeated here.

[0024] See also Figure 1 , Figure 1It is a schematic structural diagram of a straight-inclined cross-cylinder straight-channel cylinder head in one embodiment of the present invention. The straight-inclined cross-cylinder straight-channel cylinder head comprises a flat-top cylinder head 1, two exhaust channels 2, a first intake channel 3 and a second intake channel 4. The intake ends of the two exhaust channels 2 are connected to the cylinder head 1 and are arranged on one side of the cylinder head 1; the first intake channel 3 and the second intake channel 4 are tumble flow channels, and the outlet ends of the first intake channel 3 and the second intake channel 4 are both connected to the cylinder head 1 and are arranged on the other side of the cylinder head 1. A first center plane 5 passing through the axis of the cylinder head 1 is formed between the first intake channel 3 and the second intake channel 4 and the two exhaust channels 2. The first intake channel 3 is perpendicular to the first center plane 5, and the second intake channel 4 is inclined relative to the first center plane 5. The distance between the first intake channel 3 and the second intake channel 4 gradually increases in the direction away from the cylinder head 1.

[0025] Specifically, when the mixed gas enters the cylinder, the mixed gas first enters the intake manifold, and then enters the first intake passage 3 and the second intake passage 4 through the intake manifold. Since the first intake passage 3 adopts a tumble flow passage and is perpendicular to the first center plane 5, after the mixed gas enters the cylinder through the first intake passage 3, a vertical rotation motion is formed in the cylinder to generate a tumble flow, and the axis of the tumble flow is perpendicular to the axis of the cylinder; in the process of the mixed gas entering the cylinder through the second intake passage 4, since the second intake passage 4 is a tumble flow passage and is inclined relative to the first center plane, the mixed gas has two vertical motion components on the intake side of the cylinder. After the mixed gas enters the cylinder through the second intake passage 4, it will Tumble and vortex are formed in the cylinder, so that tumble and vortex are generated in the cylinder at the same time. Compared with the general pure tumble airway, the tumble formed in the cylinder by the structural design of the airway in the present invention can be generated simultaneously in the two vertical directions of X and Y on the intake and exhaust sides of the engine, which will increase the turbulent kinetic energy in the cylinder and make full use of the airflow organization for combustion; on the other hand, a certain degree of vortex can accelerate combustion in the later stage of combustion, thereby shortening the ignition delay period by tumble, reducing the combustion duration by vortex, comprehensively accelerating the combustion speed, making full use of the compression energy before the top dead center, and effectively improving the thermal efficiency; at the same time, the combination of tumble and turbine can reduce the impact of a single tumble or a turbine that is too large on the performance of the gas engine.

[0026] The design of dual intake ducts matched with dual exhaust ducts 2 is conducive to smooth airflow organization, increased tumble ratio, and full use of turbulent kinetic energy to accelerate combustion speed.

[0027] The straight inclined cross-cylinder straight airway cylinder head of the present invention adopts a flat-top cylinder head 1, which can be shared with the diesel engine cylinder head production and assembly line, with small initial manufacturing investment, and can make full use of existing resources without large-scale investment. Keeping the boundary conditions of the cylinder head 1 unchanged, by optimizing the structure and layout of the two intake ducts, organizing the tumble and vortex in the cylinder, increasing the turbulent kinetic energy in the cylinder, accelerating the flame propagation speed, accelerating combustion, and thus improving the thermal efficiency of the engine.

[0028] like Figure 1 and Figure 2 As shown, in one embodiment, two exhaust passages 2 are arranged in parallel and at intervals.

[0029] The two exhaust passages 2 are arranged in parallel and at intervals, so that the two exhaust passages 2 are independent of each other, thereby preventing the exhaust processes of the two exhaust passages 2 from affecting each other.

[0030] like Figure 1 and Figure 2 As shown, in one of the embodiments, the projections of the two exhaust passages 2 on the top surface of the cylinder head 1 are perpendicular to the first center plane 5 .

[0031] The two exhaust passages 2 are perpendicular to the first center plane 5, and exhaust on the vertical exhaust side is smooth, which can effectively reduce exhaust resistance and increase exhaust flow. The increase in exhaust flow can effectively reduce pumping damage and is beneficial to improving fuel economy.

[0032] like Figure 1 and Figure 2 As shown, in one of the embodiments, there is a second center plane 6 between the two exhaust passages 2, which passes through the axis of the cylinder head 1 and is perpendicular to the first center plane 5; the connection between the first intake passage 3 and the cylinder head 1 and the connection between one exhaust passage 2 and the cylinder head 1 are symmetrically distributed along the second center plane 6, and the connection between the second intake passage 4 and the cylinder head 1 and the connection between the other exhaust passage 2 and the cylinder head 1 are symmetrically distributed along the second center plane 6.

[0033] The symmetrical design ensures a more even airflow distribution for both the intake and exhaust, reducing performance losses caused by unbalanced airflow. Reduced Vibration: The symmetrical layout helps reduce vibrations during operation of the natural gas engine and improves mechanical stability.

[0034] like Figure 1 and Figure 2 As shown, in one embodiment, the two exhaust passages 2 are symmetrically distributed along the second center plane 6 .

[0035] The projection of the second air intake passage 4 on the top surface of the cylinder head 1 may be in an arc shape, a folded line shape, a straight line shape, etc. In one embodiment, the projection of the second air intake passage 4 on the top surface of the cylinder head 1 is in a straight line shape.

[0036] After entering the second intake passage 4 , the airflow can flow along the guide of the second intake passage 4 , and the projection on the top surface of the cylinder head 1 is a straight line, which can reduce the flow resistance of the mixed gas in the second intake passage 4 compared with other shapes.

[0037] like Figure 3As shown, in one embodiment, the first intake duct 3 and the second intake duct 4 have a first inclined air duct, an arc guide air duct and a second inclined air duct connected in sequence along the direction close to the cylinder head 1, and the slope of the first inclined air duct is smaller than the slope of the second inclined air duct.

[0038] After the mixed gas enters the first intake passage 3, it first enters the first inclined air passage with a small angle, and then smoothly transitions to the second inclined air passage with a large angle through the arc guide air passage. The mixed gas enters the cylinder through the lower part of the intake passage tangent to the large-angle wall of the cylinder. The mixed gas moves in a tumble flow in the cylinder. The axis of the tumble flow is perpendicular to the axis of the cylinder. The rotation center of the tumble flow is located at the combustion chamber 8 and the center of the cylinder, which is conducive to uniform diffusion of flame propagation. After the mixed gas enters the second intake duct 4, it first enters the first inclined air duct with a small angle, and then is smoothly transitioned and guided to the second inclined air duct with a large angle through the arc guide air duct. The mixed gas enters the cylinder through the large-angle wall of the cylinder tangent at the lower part of the intake duct. Since the second intake duct 4 is inclined relative to the first center plane 5, the mixed gas presents tumble motion and turbine motion in the cylinder, and the tumble motion and turbine motion act together in the cylinder.

[0039] like Figure 3 As shown, in one embodiment, in the projection of the first intake passage 3 and the second intake passage 4 on the second center plane 6, the first intake passage 3 and the second intake passage 4 have a first straight line segment, a first arc segment and a second straight line segment connected in sequence on the side close to the cylinder head 1, the angle θ2 between the first straight line segment and the top surface of the cylinder head 1 ranges from 0° to 15°, the angle R1 of the first arc segment ranges from 80 mm to 100 mm, and the angle θ1 between the second straight line segment and the top surface of the cylinder head 1 ranges from 40° to 60°; the first intake passage 3 and the second intake passage 4 have a third straight line segment, a second arc segment and a fourth straight line segment connected in sequence on the side away from the cylinder head 1, the angle θ4 between the third straight line segment and the top surface of the cylinder head 1 ranges from 20° to 40°, the angle R2 of the second arc segment ranges from 80 mm to 100 mm, and the angle θ3 between the fourth straight line segment and the top surface of the cylinder head 1 ranges from 30° to 50°.

[0040] Among them, the area of ​​the inner wall between the first straight line segment and the third straight line segment is the first inclined airway, the area of ​​the inner wall between the first arc segment and the second arc segment is the arc guide airway, and the area of ​​the inner wall between the second straight line segment and the fourth straight line segment is the second inclined airway.

[0041] Specifically, Figure 3As shown, in one embodiment, the angle θ2 between the first straight line segment and the top surface of the cylinder head 1 is 7.5°, the angle R1 of the first arc segment is in the range of 90 mm, and the angle θ1 between the second straight line segment and the top surface of the cylinder head 1 is in the range of 50°; the side of the intake duct 2 away from the cylinder head 1 has a third straight line segment, a second arc segment and a fourth straight line segment connected to each other, the angle θ4 between the third straight line segment and the top surface of the cylinder head 1 is in the range of 30°, the angle R2 of the second arc segment is in the range of 90 mm, and the angle θ3 between the fourth straight line segment and the top surface of the cylinder head 1 is in the range of 40°.

[0042] The first intake port 3, the second intake port 4 and the two exhaust ports 2 formed with the above-mentioned dimensions can simultaneously form tumble flow and swirl flow in the cylinder.

[0043] In a second aspect, the present invention further provides a gas engine, comprising the above straight inclined cross-cylinder straight gas channel cylinder head. Since the engine adopts the straight inclined cross-cylinder straight gas channel cylinder head in the above embodiment, the technical effect of the gas engine can refer to the above embodiment.

[0044] like Figure 2 As shown, in one of the embodiments, there are multiple straight-inclined cross-cylinder straight-channel cylinder heads in the gas engine, and two adjacent second intake ducts 4 in adjacent straight-inclined cross-cylinder straight-channel cylinder heads share an intake port 7, and the side walls of the intake ends of the two second intake ducts 4 are provided with openings connecting the two second intake ducts 4.

[0045] Through the above arrangement, two adjacent second air inlet ducts 4 share one air inlet 7, and two second air inlet ducts 4 can be installed in a limited space. At the same time, the use of one air inlet 7 increases the area of ​​the air inlet 7 of the second air inlet duct 4, increases the flow coefficient, and is conducive to the increase of the intake flow rate. By more intake, the gas and air are fully mixed, supporting more complete combustion, thereby releasing more energy. In addition, the increase in intake flow rate also avoids incomplete combustion as much as possible, reduces harmful substances in emissions, and optimizes emission control. At the same time, the use of one air inlet 7 can reduce the number of interfaces of the air inlet 7 and reduce the difficulty of assembly and assembly.

[0046] like Figure 3 and Figure 4 As shown, in one of the embodiments, the gas engine further includes a combustion chamber 8 matched with the cylinder head 1 .

[0047] It should be understood that the combustion chamber 8 may be cylindrical or may be of other shapes, for example Figure 4 As shown, in one embodiment, the combustion chamber 8 is cylindrical on one side close to the cylinder head 1, and the inner wall and outer wall of the combustion chamber 8 away from the cylinder head 1 are spherical.

[0048] Through the above arrangement, when the mixed gas flows through the spherical surface at the bottom of the combustion chamber 8, it can flow along the spherical surface at the bottom of the combustion chamber 8 to form a tumble flow in the combustion chamber 8, and can cooperate with the arc-shaped center-cross-cylinder straight air channel cylinder head to enhance the tumble flow in the cylinder during the intake and compression strokes, thereby increasing the combustion speed and reducing fuel consumption.

[0049] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific conditions.

[0052] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0053] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A straight inclined cross-cylinder straight airway cylinder head, characterized in that: include: Flat top cylinder head; Two exhaust passages, the air inlet ends of the two exhaust passages are connected to the cylinder head and are arranged on one side of the cylinder head; The first intake duct and the second intake duct are tumble flow ducts, the outlet ends of the first intake duct and the second intake duct are both connected to the cylinder head and are arranged on the other side of the cylinder head, a first center plane passing through the axis of the cylinder head is formed between the first intake duct and the second intake duct and the two exhaust ducts, the first intake duct is perpendicular to the first center plane, the second intake duct is inclined relative to the first center plane, and the distance between the first intake duct and the second intake duct gradually increases in the direction away from the cylinder head.

2. The straight inclined cross-cylinder straight airway cylinder head according to claim 1, characterized in that: The first air intake passage and the second air intake passage both have a first inclined air passage, an arc guide air passage and a second inclined air passage which are connected in sequence along a direction close to the cylinder head, and the slope of the first inclined air passage is smaller than the slope of the second inclined air passage.

3. The straight inclined cross-cylinder straight airway cylinder head according to claim 2, characterized in that: A second center plane passing through the axis of the cylinder head and perpendicular to the first center plane is provided between the first intake passage and the second intake passage; In the projection of the first air inlet passage and the second air inlet passage on the second central plane, the first air inlet passage and the second air inlet passage have a first straight line segment, a first arc segment and a second straight line segment connected in sequence on one side close to the cylinder head, the angle θ2 between the first straight line segment and the top surface of the cylinder head is in the range of 0° to 15°, the angle R1 of the first arc segment is in the range of 80 mm to 100 mm, and the angle θ1 between the second straight line segment and the top surface of the cylinder head is in the range of 40° to 60°; The first and second air inlet passages have a third straight line segment, a second arc segment and a fourth straight line segment connected in sequence on the side away from the cylinder head, the angle θ4 between the third straight line segment and the top surface of the cylinder head is in the range of 20° to 40°, the angle R2 of the second arc segment is in the range of 80 mm to 100 mm, and the angle θ3 between the fourth straight line segment and the top surface of the cylinder head is in the range of 30° to 50°.

4. The straight inclined cross-cylinder straight airway cylinder head according to claim 1, characterized in that: The two exhaust passages are arranged in parallel and at intervals.

5. The straight inclined cross-cylinder straight airway cylinder head according to claim 1, characterized in that: The projections of the two exhaust passages on the top surface of the cylinder head are perpendicular to the first center plane.

6. The straight inclined cross-cylinder straight airway cylinder head according to claim 1, characterized in that: A second center plane passing through the axis of the cylinder head and perpendicular to the first center plane is provided between the two exhaust passages; The connection point between the first intake passage and the cylinder head and the connection point between one exhaust passage and the cylinder head are symmetrically distributed along the second center plane, and the connection point between the second intake passage and the cylinder head and the connection point between the other exhaust passage and the cylinder head are symmetrically distributed along the second center plane.

7. The straight inclined cross-cylinder straight airway cylinder head according to claim 1, characterized in that: The second intake passage is in a straight line shape in the projection of the top surface of the cylinder head.

8. A gas engine, characterized in that: It comprises a straight inclined cross-cylinder straight-port cylinder head as described in any one of claims 1-7.

9. The gas engine according to claim 8, characterized in that: The gas engine has a plurality of straight-inclined cross-cylinder straight-channel cylinder heads, two adjacent second intake ducts in adjacent straight-inclined cross-cylinder straight-channel cylinder heads share an intake port, and the side walls of the intake ends of the two second intake ducts are provided with openings connecting the two second intake ducts.

10. The gas engine according to claim 9, characterized in that: It also includes a combustion chamber matched with the cylinder head. The combustion chamber is cylindrical on one side close to the cylinder head, and the inner wall and outer wall of the combustion chamber away from the cylinder head are spherical.

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