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

Abstract

The invention relates to the technical field of gas engine cylinder covers, and discloses a straight centering cross cylinder straight air channel cylinder cover and a gas engine, the straight centering cross cylinder straight air channel cylinder cover comprises a flat-top cylinder cover, two air inlet channels and two exhaust channels, the two air inlet channels are tumble flow channels, the two air inlet channels are communicated with the cylinder cover, and the distance between the two air inlet channels is gradually increased in the direction away from the cylinder cover; the two exhaust passages are communicated with the cylinder cover and are arranged in a spaced mode. According to the straight-centering cylinder-crossing straight-air-channel cylinder cover, mixed gas enters a cylinder through the air inlet manifold, the air inlet channel and the cylinder cover, and airflow mainly organizes a flow field in the air inlet channel and is matched with a combustion chamber to form airflow movement influencing combustion. The tumble air channel is adopted as the air inlet channel, after mixed fuel gas enters the air cylinder through the tumble air channel, the mixed fuel gas rotates in the vertical direction in the air cylinder to generate tumble, airflow can generate an impact effect in the center of the air cylinder, mainly in the position of a spark plug, and the design of the double exhaust channels arranged separately can reduce the exhaust resistance for preventing electrodes of the spark plug from being frozen in winter.

Description

Technical Field

[0001] The invention relates to the technical field of gas engine cylinder heads, and in particular to a straight-to-center-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, and the turbulent kinetic energy in the cylinder is low at the time of ignition. At the same time, large-scale vortex will lead to an increase in the tendency of knock, which is not conducive to improving thermal efficiency. Summary of the invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and propose a cylinder head and a gas engine with a straight-to-center-cross cylinder and a straight-air duct, so as to solve the technical problems in the prior art that the cylinder head adopts a vortex air duct, resulting in low turbulent kinetic energy and a large tendency to knock.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In the first aspect, the present invention provides a straight-to-center-span cylinder head with straight air passages, comprising a flat-top cylinder head, two intake passages and two exhaust passages, wherein the two intake passages are tumble flow passages, the two intake passages are connected to the cylinder head, and the distance between the two intake passages gradually increases in the direction away from the cylinder head; the two exhaust passages are connected to the cylinder head, and the two exhaust passages are spaced apart.

[0006] In one embodiment, the intake passage comprises 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.

[0007] In one embodiment, there is a first center plane passing through the axis of the cylinder head between the two intake ducts, and in the projection of the intake duct on the first center plane, the side of the intake duct close to the cylinder head has a first straight line segment, a first arc segment and a second straight line segment connected in sequence, 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 side of the intake duct away from the cylinder head has a third straight segment, a second arc segment and a fourth straight segment connected in sequence, the angle θ4 between the third straight 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 segment and the top surface of the cylinder head is in the range of 30° to 50°.

[0008] In one embodiment, the projection of the intake passage on the top surface of the cylinder head is in a straight line shape.

[0009] In one embodiment, a first center plane passing through the axis of the cylinder head is provided between the two intake passages, and the two intake passages are symmetrically arranged on both sides of the first center plane.

[0010] In one embodiment, an angle between an extension line of a projection of the intake passage on the top surface of the cylinder head and the first center plane is in a range of 30° to 60°.

[0011] In one embodiment, a second center plane passing through the axis of the cylinder head is provided between the two intake passages and the two exhaust passages, and the connecting parts between the two intake passages and the cylinder head and the connecting parts between the two exhaust passages and the cylinder head are symmetrical.

[0012] In one embodiment, the intake passage comprises 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.

[0013] In one embodiment, in the projection of the intake duct on the first center plane, the intake duct has a first straight line segment, a first arc segment and a second straight line segment connected in sequence on one side thereof 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 side of the intake duct away from the cylinder head has a third straight segment, a second arc segment and a fourth straight segment connected in sequence, the angle θ4 between the third straight 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 segment and the top surface of the cylinder head is in the range of 30° to 50°.

[0014] In a second aspect, the present invention further provides a gas engine, comprising the above-mentioned straight-to-center-cross-cylinder straight-airway cylinder head.

[0015] In one embodiment, the gas engine has a plurality of cylinder heads with straight-to-center-cross-cylinder straight air passages, two adjacent intake ducts in adjacent cylinder heads with straight-to-center-cross-cylinder straight air passages share an intake port, and the side walls of the intake ends of the two adjacent intake ducts are provided with openings connecting the two intake ducts.

[0016] 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.

[0017] Compared with the prior art, the present invention provides a straight-to-center-cross-cylinder straight-air duct cylinder head and a gas engine. During the intake stroke, the mixed gas enters the cylinder through the intake manifold, the intake duct and the cylinder head. The airflow mainly organizes the flow field in the intake duct, and cooperates with the combustion chamber to form an airflow movement that affects combustion.

[0018] The mixed gas after combustion in the combustion chamber is discharged from two exhaust ducts. The dual exhaust duct design with separate arrangement can reduce exhaust resistance, reduce pumping loss and improve energy utilization. Due to the dual intake ducts and dual exhaust ducts, the airflow organization is relatively smooth, which is also beneficial to the improvement of tumble ratio, which is conducive to accelerating combustion and improving thermal efficiency.

[0019] Moreover, the intake duct adopts a tumble flow duct. After the mixed gas enters the cylinder through the tumble flow duct, 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. At the same time, since the two intake ducts gradually move away from the cylinder head, the airflows of the two-way mixed gas entering the cylinder offset each other, and the formed tumble flow can be placed in the center of the combustion chamber cylinder, which is conducive to the uniform diffusion of the flame. On the other hand, the airflow will produce an impact effect in the center of the cylinder, mainly at the spark plug position, which is beneficial for preventing the spark plug electrode from freezing in winter.

[0020] The arc-shaped centering straight-centering 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 boundary conditions of the cylinder head unchanged, by optimizing the intake duct structure and the layout of the two intake ducts, the tumble flow in the cylinder is organized, the turbulent kinetic energy in the cylinder is increased, the flame propagation speed is accelerated, and the combustion is accelerated, thereby improving the thermal efficiency of the engine.

[0021] Compared with the traditional vortex airway, the tumble generated by this proposal has higher turbulent kinetic energy at the time of ignition, which is conducive to the flame diffusion to fill the entire combustion chamber and improve efficiency. Compared with the general tumble straight airway, the two intake ducts in this proposal gradually move away from the cylinder head, and the tumble can be formed to the middle of the combustion chamber through airflow organization. The airflow forms a tumble around the central axis of the cylinder, which can spread the combustion flame more evenly, enhance combustion stability, and accelerate combustion speed, which is conducive to reducing combustion cycle changes and improving the thermal efficiency of the whole machine. At the same time, the two airways guide the airflow to the center of the cylinder, which can further increase the turbulent kinetic energy at the ignition position, thereby helping to improve thermal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a cylinder head with straight-to-center-cross-cylinder and straight-airway provided by an 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.

[0023] Description of reference numerals: Cylinder head 1; intake duct 2; exhaust duct 3; first center plane 4; second center plane 5; intake port 6; combustion chamber 7. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] In order to solve the technical problem that the cylinder head adopts vortex air ducts resulting in low turbulent kinetic energy and a large tendency to knock, the present invention provides a straight-to-center-span cylinder head and a gas engine, which can achieve the cylinder head adopts vortex air ducts resulting in low turbulent kinetic energy and a large tendency to knock.

[0028] It should be noted that the straight-on-center-span cylinder head with straight air passage 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-on-center-span cylinder head with straight air passage applied to a gas engine is used as an example for explanation, and the principle of applying the straight-on-center-span cylinder head with straight air passage in other types of equipment is essentially the same as the principle applied to the gas engine, which will not be elaborated here.

[0029] See also Figure 1 , Figure 1 It is a schematic structural diagram of a cylinder head with straight center-span cylinder and straight air passage in one embodiment of the present invention. The cylinder head with straight center-span cylinder and straight air passage includes a flat-top cylinder head 1, two intake passages 2 and two exhaust passages 3. The two intake passages 2 are tumble flow passages. The two intake passages 2 are connected to the cylinder head 1, and the distance between the two intake passages 2 gradually increases in the direction away from the cylinder head 1; the two exhaust passages 3 are connected to the cylinder head 1, and the two exhaust passages 3 are arranged at intervals.

[0030] Specifically, during the intake stroke, the mixed gas enters the cylinder through the intake manifold, the intake duct 2 and the cylinder head 1. The airflow mainly organizes the flow field in the intake duct 2 and cooperates with the combustion chamber to form an airflow movement that affects combustion.

[0031] The mixed gas after combustion in the combustion chamber is discharged from the two exhaust ducts 3. The design of the separate dual exhaust ducts 3 can reduce exhaust resistance, reduce pumping loss, and improve energy utilization. Since the dual intake ducts 2 are connected to the dual exhaust ducts 3, the airflow organization is relatively smooth, which is also beneficial to the improvement of the tumble ratio, which is conducive to accelerating combustion and improving thermal efficiency.

[0032] Moreover, the intake duct 2 adopts a tumble flow duct. After the mixed gas enters the cylinder through the tumble flow duct, 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. At the same time, since the two intake ducts 2 gradually move away from the cylinder head 1, the airflows of the two-way mixed gas entering the cylinder offset each other, and the formed tumble flow can be placed in the center of the combustion chamber cylinder, which is beneficial to the uniform diffusion of the flame. On the other hand, the airflow will produce an impact effect in the center of the cylinder, mainly at the spark plug position, which is beneficial for preventing the spark plug electrode from freezing in winter.

[0033] The arc-shaped centering straight-centering 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 of the intake duct 2 and the layout of the two intake ducts 2, the tumble flow in the cylinder is organized, the turbulent kinetic energy in the cylinder is increased, the flame propagation speed is accelerated, and the combustion is accelerated, thereby improving the thermal efficiency of the engine.

[0034] Compared with the traditional vortex airway, the tumble generated by this proposal has higher turbulent kinetic energy at the time of ignition, which is conducive to the flame diffusion to fill the entire combustion chamber and improve efficiency. Compared with the general tumble straight airway, the two intake ducts 2 in this proposal gradually move away from the cylinder head 1, and the tumble can be formed to the middle of the combustion chamber through airflow organization. The airflow forms a tumble around the central axis of the cylinder, which can spread the combustion flame more evenly, enhance combustion stability, and accelerate combustion speed, which is conducive to reducing combustion cycle changes and improving the thermal efficiency of the whole machine. At the same time, the two airways guide the airflow to the center of the cylinder, which can further increase the turbulent kinetic energy at the ignition position, thereby helping to improve thermal efficiency.

[0035] like Figure 1 and Figure 2 As shown, in one of the embodiments, the projection of the intake passage 2 on the top surface of the cylinder head 1 is in a straight line shape.

[0036] In this embodiment, through the above-mentioned arrangement, when the airflow enters the cylinder through the intake duct 2, the airflow flows in a straight line in the projection direction of the top surface of the cylinder head 1. In this direction, the intake duct 2 helps to provide a more stable airflow and reduce the disturbance of the airflow when entering the cylinder, thereby improving the efficiency and performance of the engine.

[0037] like Figure 1 and Figure 2 As shown, in one embodiment, a first center plane 4 passing through the axis of the cylinder head 1 is provided between the two intake passages 2 , and the two intake passages 2 are symmetrically arranged on both sides of the first center plane 4 .

[0038] Through the above arrangement, the two intake passages 2 are symmetrically distributed along the first center plane 4, and the flow path and flow velocity of the mixed gas entering the cylinder through the two intake passages 2 are the same. The impact center of the mixed gas entering from the two routes is located in the middle of the cylinder, and the impact position corresponds to the spark plug, thereby avoiding deviation of the impact center of the two mixed gases, making the tumble flow formed in the cylinder more stable, and both mixed gases from the two routes can impact the spark plug.

[0039] An angle that is too large or too small will cause the impact position of the mixed gas entering the cylinder through the two intake ducts 2 to deviate from the spark plug, and will cause too much or too little impact in the direction parallel to the first center plane 4. For this reason, in one embodiment, the angle between the extension line of the projection of the intake duct 2 on the top surface of the cylinder head 1 and the first center plane 4 is in the range of 30° to 60°.

[0040] By limiting the angle between the extension line of the projection of the intake duct 2 on the top surface of the cylinder head 1 and the first center plane 4 within the above-mentioned range, the impact position of the mixed fuel gas entering the cylinder through the two intake ducts 2 is directed toward the spark plug, while at the same time, excessive or insufficient impact in the direction parallel to the first center plane 4 can be avoided.

[0041] like Figure 1 and Figure 2 As shown, in one of the embodiments, the angle between the extension line of the projection of the intake passage 2 on the top surface of the cylinder head 1 and the first center plane 4 is 45°.

[0042] In this embodiment, in the projection of the intake duct 2 on the top surface of the cylinder head 1, the components of the mixed gas in two directions parallel to the first center plane 4 and perpendicular to the first center plane 4 are equal. At this time, the mixed gas in the direction parallel to the first center plane 4 collides, and the mixed gas after the collision diffuses in all directions in the cylinder to form turbulence, while the mixed gas in the direction perpendicular to the first center plane 4 forms a tumble flow in the cylinder, and the ratio of the two is equal. While the impact position is facing the spark plug, the ratio of turbulence and tumble flow of the mixed gas in the cylinder can also be effectively controlled, thereby helping to improve thermal efficiency. This ratio is the most preferred value.

[0043] like Figure 1 and Figure 2 As shown, in one embodiment, the two exhaust passages 3 are symmetrical along the first center plane 4 .

[0044] The two exhaust passages 3 are symmetrically arranged, so that the exhaust paths and exhaust flow fields of the two exhaust passages 3 are the same, and the exhaust gas can enter the exhaust passage 3 from the cylinder at the same angle and path, and the exhaust gas is more stable.

[0045] In one embodiment, a second center plane 5 passing through the axis of the cylinder head 1 is provided between the two intake passages 2 and the two exhaust passages 3, and the connecting parts between the two intake passages 2 and the cylinder head 1 and the connecting parts between the two exhaust passages 3 and the cylinder head 1 are symmetrical.

[0046] 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.

[0047] like Figure 1 and Figure 2 As shown, in one of the embodiments, the second center plane 5 is perpendicular to the first center plane 4 , and the extension line of the projection of the intake passage 2 on the top surface of the cylinder head 1 is perpendicular to the second center plane 5 .

[0048] By setting the projection of the intake duct 2 on the top surface of the cylinder head 1 to be straight, and combining the layout of the intake duct 2 in this embodiment, the mixed gas enters the cylinder in a straight line in the projection direction of the top surface of the cylinder head 1, and after combustion, the air flow is discharged from the exhaust duct 3 in a straight line in the direction perpendicular to the second center plane 5. The cooperation of the two can reduce unnecessary vortices, reduce flow resistance, and make the air flow smoother.

[0049] In order to form a tumble air passage in the cylinder body, in one embodiment, the intake passage 2 has a first inclined air passage, an arc guide air passage and a second inclined air passage connected in sequence along a direction close to the cylinder head 1, and the slope of the first inclined air passage is smaller than the slope of the second inclined air passage.

[0050] After the mixed gas enters the intake duct 2, it first enters the first inclined air duct with a small angle, and then is smoothly transitioned 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 2, and the mixed gas tumbles in the cylinder. The axis of the tumble is perpendicular to the axis of the cylinder, and its rotation center is located at the combustion chamber 7 and the center of the cylinder, which is conducive to uniform diffusion of flame propagation.

[0051] like Figure 3 and Figure 4As shown, in one of the embodiments, in the projection of the intake duct 2 on the first center plane 4, the side of the intake duct 2 close to the cylinder head 1 has a first straight line segment, a first arc segment and a second straight line segment connected in sequence, the angle θ2 between the first straight line segment and the top surface of the cylinder head 1 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 1 is in the range of 40° to 60°; 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 in sequence, the angle θ4 between the third straight line segment and the top surface of the cylinder head 1 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 1 is in the range of 30° to 50°.

[0052] 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.

[0053] Specifically, Figure 3 and Figure 4 As 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 in sequence, 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°.

[0054] In the intake port 2 formed with the above dimensions, it can be seen that the tumble flow rotates in the center of the cylinder and has an impact flow field near the spark plug.

[0055] In a second aspect, the present invention further provides a gas engine, comprising the above straight-to-center-cross-cylinder straight-airway cylinder head. Since the engine adopts the arc-shaped center-cross-cylinder straight-airway cylinder head in the above embodiment, the technical effect of the gas engine can refer to the above embodiment.

[0056] Since the distance between the two intake passages 2 gradually increases in the direction away from the cylinder head 1, when a plurality of cylinders and cylinder heads 1 are provided in the gas engine, interference will occur between the intake pipes on adjacent cylinder heads 1. Figure 2As shown, in one of the embodiments, there are multiple straight-to-center-cross-cylinder straight-channel cylinder heads in the gas engine, and two adjacent intake ducts 2 in adjacent straight-to-center-cross-cylinder straight-channel cylinder heads share an intake port 6, and the side walls of the intake ends of the two adjacent intake ducts 2 are provided with openings connecting the two intake ducts 2.

[0057] Through the above arrangement, when the two intake pipes on the cylinder head 1 move away from each other in the direction away from the cylinder head 1, the intake ends of the two adjacent intake pipes in the adjacent straight-to-center-cross-cylinder straight airway cylinder head are merged and combined into a shared intake port 6, so that the intake pipe can be prevented from interfering with the installation position of the intake pipe in the adjacent straight-to-center-cross-cylinder straight airway cylinder head while achieving intake; at the same time, one intake port 6 is adopted, and the area of ​​a shared intake port 6 is much larger than the cross-sectional area of ​​a single intake pipe, so that the area of ​​the intake port 6 of the intake duct 2 is increased, the flow coefficient is increased, and it is beneficial to increase the intake flow rate, and more intake ensures that the fuel 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 intake port 6 can reduce the number of interfaces of the intake port 6 and reduce the difficulty of assembly and assembly.

[0058] like Figure 3 and Figure 4 As shown, in one of the embodiments, the gas engine further includes a combustion chamber 7 matched with the cylinder head 1 .

[0059] It should be understood that the combustion chamber 7 may be cylindrical or in other shapes, for example Figure 3 and Figure 4 As shown, in one embodiment, the combustion chamber 7 is cylindrical on one side close to the cylinder head 1, and the inner wall and outer wall of the combustion chamber 7 away from the cylinder head 1 are spherical.

[0060] Through the above arrangement, when the mixed gas flows through the spherical surface at the bottom of the combustion chamber 7, it can flow along the spherical surface at the bottom of the combustion chamber 7 to form a tumble flow in the combustion chamber 7, and can cooperate with the arc-shaped center-cross-cylinder straight air channel cylinder head to strengthen the tumble flow in the cylinder during the intake and compression strokes, thereby increasing the combustion speed and reducing fuel consumption.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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 cylinder head with a straight center span and straight airway, characterized in that: include: Flat top cylinder head; Two intake passages, the two intake passages are tumble flow passages, the two intake passages are connected to the cylinder head, and the distance between the two intake passages gradually increases in a direction away from the cylinder head; and Two exhaust passages are connected to the cylinder head and are arranged at intervals.

2. The cylinder head with straight center span and straight air passage according to claim 1, characterized in that: The intake passage has 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 cylinder head with straight center span and straight air passage according to claim 2, characterized in that: A first center plane passing through the axis of the cylinder head is provided between the two intake ducts. In the projection of the first center plane of the intake duct, a side of the intake duct close to the cylinder head has a first straight line segment, a first arc segment and a second straight line segment connected in sequence. An angle θ2 between the first straight line segment and the top surface of the cylinder head is in a range of 0° to 15°, an angle R1 of the first arc segment is in a range of 80 mm to 100 mm, and an angle θ1 between the second straight line segment and the top surface of the cylinder head is in a range of 40° to 60°. The side of the intake duct away from the cylinder head has a third straight segment, a second arc segment and a fourth straight segment connected in sequence, the angle θ4 between the third straight 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 segment and the top surface of the cylinder head is in the range of 30° to 50°.

4. The cylinder head with straight center span and straight air passage according to claim 1, characterized in that: The projection of the intake passage on the top surface of the cylinder head is in a straight line shape.

5. The cylinder head with straight center span and straight air passage according to claim 3, characterized in that: The two air inlets are symmetrically arranged on both sides of the first center plane.

6. The cylinder head with straight center span and straight air passage according to claim 5, characterized in that: The included angle between an extension line of a projection of the intake passage on the top surface of the cylinder head and the first center plane is in a range of 30° to 60°.

7. The cylinder head with straight center span and straight air passage according to claim 1, characterized in that: A second center plane passing through the axis of the cylinder head is provided between the two intake passages and the two exhaust passages, and the connecting parts between the two intake passages and the cylinder head and the connecting parts between the two exhaust passages and the cylinder head are symmetrical.

8. A gas engine, characterized in that: It comprises a cylinder head with a straight-to-center cross-cylinder and a straight-airway as described in any one of claims 1 to 7.

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

10. The gas engine according to claim 8, 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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