Arc-shaped 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 an arc-shaped centering cross-cylinder straight-air-channel cylinder cover and a gas engine, the arc-shaped centering cross-cylinder straight-air-channel cylinder cover comprises a cylinder cover and two air inlet channels, and the cylinder cover is a flat-top cylinder cover; the two air inlet channels are tumble air channels and communicate with the cylinder cover, the communicating positions of the two air inlet channels and the cylinder cover are arranged in a spaced mode, and the two air inlet channels are gradually away from each other in the direction away from the cylinder cover. According to the arc-shaped centering cylinder-spanning straight air channel cylinder cover, rotating motion in the vertical direction is formed in a cylinder to generate tumble flow, and the axis of the tumble flow is perpendicular to the axis of the cylinder; meanwhile, as the two gas inlet channels are gradually far away from each other in the direction far away from the cylinder cover, airflow of the double-path mixed gas entering the cylinder impacts against each other, formed tumble can be placed in a combustion chamber and the center of the cylinder, and flame propagation and uniform diffusion are facilitated; and on the other hand, the airflow can generate an impact effect in the center of the cylinder, mainly in the spark plug position, which is beneficial to preventing the spark plug electrode from icing in winter.

Description

Technical Field

[0001] The invention relates to the technical field of gas engine cylinder heads, and in particular to an arc-shaped 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 requires the organization of a certain intensity of tumble flow in the cylinder, but 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.

[0003] However, most of the heavy-duty gas engines 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 vortices will lead to an increased tendency to 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 an arc-shaped center-span straight airway cylinder head and a gas engine to solve the technical problems in the prior art of using vortex airways in cylinder heads resulting in low turbulent kinetic energy and a high tendency to knock.

[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 an arc-shaped center-cross-cylinder straight airway cylinder head, comprising: The cylinder head is a flat top cylinder head; Two intake ducts are tumble flow ducts and are connected to the cylinder head. The connecting parts of the two intake ducts and the cylinder head are arranged at intervals, and the two intake ducts gradually move away from each other in a direction away from the cylinder head.

[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, the invention further comprises two exhaust passages, the two exhaust passages are connected to the cylinder head, a second center plane is provided between the two intake passages and the two exhaust passages, the second center plane passes through the axis of the cylinder head, and in the projection of the intake passage on the second center plane, a side of the intake passage close to the cylinder head comprises 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 two exhaust passages gradually approach each other in a direction away from the cylinder head.

[0009] In one embodiment, there is a first center plane between the two intake passages, the first center plane passes through the axis of the cylinder head, and the two intake passages are symmetrically distributed along the first center plane.

[0010] In one embodiment, the two exhaust passages are symmetrically distributed along the first center plane.

[0011] In one embodiment, the connection point between the intake passage and the cylinder head and the connection point between the exhaust passage and the cylinder head are symmetrical along the second center plane.

[0012] In a second aspect, the present invention further provides a gas engine, comprising the above-mentioned arc-shaped center-cross-cylinder straight air passage cylinder head.

[0013] In one embodiment, the gas engine has a plurality of cylinder heads with arc-shaped center-cross-cylinder straight air passages, two adjacent intake ducts in the adjacent arc-shaped center-cross-cylinder straight air passage cylinder heads 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.

[0014] 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.

[0015] Compared with the prior art, the arc-shaped center-cross-cylinder straight-passage cylinder head and gas engine provided by the present invention, when the mixed gas enters the cylinder, the mixed gas first enters the intake manifold, and enters the intake duct through the intake cylinder, and then enters the cylinder through the intake duct. Since 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 and the cylinder, which is conducive to uniform diffusion of flame propagation; 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.

[0016] The arc-shaped center-cross cylinder straight-airway cylinder head of the present invention adopts a flat-top cylinder head, which can be used in the production and assembly line of diesel engine cylinder heads. The initial manufacturing investment is small, and existing resources can be fully utilized 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.

[0017] 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

[0018] Figure 1 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 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 streamline diagram of the airflow in the cylinder head in the prior art; Figure 5It is a TKE (Turbulence Kinetic Energy) slice diagram of the airflow in the cylinder head with an arc-shaped center-cross-cylinder straight air passage provided by an embodiment of the present invention.

[0019] Description of reference numerals: Cylinder head 1; intake duct 2; exhaust duct 3; exhaust port 4; first center plane 5; second center plane 6; intake port 7; combustion chamber 8. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] 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.

[0023] In order to solve the technical problems in the prior art that the cylinder head adopts vortex air ducts resulting in low turbulent kinetic energy and a high tendency to knock, the present invention provides an arc-shaped center-span straight air duct cylinder head and a gas engine, which can solve the technical problems in the prior art that the cylinder head adopts low turbulent kinetic energy and a high tendency to knock.

[0024] It should be noted that the arc-shaped 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 arc-shaped center-span cylinder head with straight air passage is used in a gas engine as an example for explanation, and the principle of using the arc-shaped center-span cylinder head with straight air passage in other types of equipment is essentially the same as the principle of using it in a gas engine, which will not be repeated here.

[0025] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of an arc-shaped center-cross-cylinder straight-air channel cylinder head in one embodiment of the present invention. The arc-shaped center-cross-cylinder straight-air channel cylinder head includes a cylinder head 1 and two intake channels 2. The cylinder head 1 is a flat-top cylinder head; the two intake channels 2 are tumble flow channels and are connected to the cylinder head 1. The connecting points between the two intake channels 2 and the cylinder head 1 are spaced apart, and the two intake channels 2 gradually move away from each other in the direction away from the cylinder head 1.

[0026] Specifically, when the mixed gas enters the cylinder, the mixed gas first enters the intake manifold, and enters the intake duct 2 through the intake manifold, and then enters the cylinder through the intake duct 2. Since 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 combustion chamber 8 and the center of the cylinder, which is conducive to uniform diffusion of flame propagation; 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.

[0027] The arc-shaped center-cross cylinder straight-passage cylinder head of the present invention adopts a flat-top cylinder head, which can be used in the production and assembly line of the diesel engine cylinder head 1. The initial manufacturing investment is small, and the existing resources can be fully utilized 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.

[0028] 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 8, and is conducive to improving 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 8 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.

[0029] like Figure 1 As shown, in one of the embodiments, the arc-shaped center-cross-cylinder straight air passage cylinder head also includes two exhaust passages 3, the two exhaust passages 3 are connected to the cylinder head 1, and the two exhaust passages 3 gradually approach each other in a direction away from the cylinder head 1.

[0030] The two exhaust passages 3 gradually approach each other in the direction away from the cylinder head 1. The two exhaust passages 3 can not only provide for the discharge of tumble flow, but also help to discharge the chaotic vortex that may exist in the cylinder smoothly. Cooperating with the two intake passages 2, the tumble flow field in the cylinder can be effectively assembled.

[0031] like Figure 1 As shown, in one embodiment, two exhaust passages 3 share one exhaust port 4, and two exhaust passages 3 are connected with each other at the exhaust port 4.

[0032] As the two exhaust ducts 3 gradually approach each other in the direction away from the cylinder, the intake ducts 2 of the two exhaust ducts 3 gradually approach each other in the direction away from the cylinder. In order to arrange the two exhaust ducts 3 in a limited space, in this embodiment, the two exhaust ducts 3 share one exhaust port 4, so that the two exhaust ducts 3 can be close to each other, and the two exhaust ducts 3 can be arranged as close to the set angle as possible. At the same time, sharing one exhaust port 4 reduces the number of interfaces for docking with subsequent equipment, increases the area of ​​the exhaust port 4, can increase the exhaust flow rate, reduce the exhaust resistance, and effectively promote the emptying of the cylinder.

[0033] Since the exhaust passages 3 share an exhaust port 4, there is a distance between the exhaust end of the exhaust passage 3 and the outlet end of the exhaust passage 3 along the radial direction of the cylinder. Figure 1 As shown, in one of the embodiments, the projection of the exhaust passage 3 on the top surface of the cylinder head 1 is arc-shaped.

[0034] By setting the projection of the exhaust passage 3 on the top surface of the cylinder head 1 to be arc-shaped, the exhaust passage 3 can be discharged from the cylinder in an arc-shaped manner. The arc-shaped exhaust passage 3 can guide the mixed gas to be discharged from the exhaust passage 3 in an arc-shaped manner and discharge from the cylinder from the exhaust port 4 of the exhaust passage 3, thereby avoiding corners in the intake path and reducing exhaust damping.

[0035] like Figure 1 As shown, in one of the embodiments, a first center plane 5 is provided between the two intake passages 2 , the first center plane 5 passes through the axis of the cylinder head 1 , and the two intake passages 2 are symmetrically distributed along the first center plane 5 .

[0036] Through the above arrangement, the two intake passages 2 are symmetrically distributed along the first center plane 5, 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.

[0037] like Figure 1 As shown, in one embodiment, the two exhaust passages 3 are symmetrically distributed along the first center plane 5 .

[0038] 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.

[0039] like Figure 1 As shown, in one of the embodiments, there is a second center plane 6 between the two intake passages 2 and the two exhaust passages 3, the second center plane 6 passes through the axis of the cylinder head 1, and the connecting parts of the intake passages 2 and the cylinder head 1 and the connecting parts of the exhaust passages 3 and the cylinder head 1 are symmetrical along the second center plane 6.

[0040] 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.

[0041] In order to form a tumble flow channel in the cylinder body, Figure 3 As shown, in one embodiment, the intake passage 2 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 1, and the slope of the first inclined air passage is smaller than the slope of the second inclined air passage.

[0042] 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 8 and the center of the cylinder, which is conducive to uniform diffusion of flame propagation.

[0043] like Figure 3 As shown, in one of the embodiments, in the projection of the intake duct 2 on the second center plane 6, 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°.

[0044] 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.

[0045] Specifically, Figure 3 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°.

[0046] like Figure 4 and Figure 5 As shown, 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.

[0047] In a second aspect, the present invention further provides a gas engine, comprising the above-mentioned arc-shaped center-cross-cylinder straight-airway cylinder head. Since the engine adopts the arc-shaped center-cross-cylinder straight-airway cylinder head in the above-mentioned embodiment, the technical effect of the gas engine can refer to the above-mentioned embodiment.

[0048] As the two intake passages 2 gradually move away from the cylinder head 1, the distance between the two intake passages 2 will gradually decrease. However, there are multiple cylinder heads with arc-shaped center-cross cylinder straight passages in the gas engine. In order to arrange the two intake passages 2 at a preset angle within a limited space, for example, Figure 2 As shown, in one of the embodiments, there are multiple arc-shaped center-cross-cylinder straight-channel cylinder heads in the gas engine, and two adjacent intake ducts 2 in adjacent arc-shaped center-cross-cylinder straight-channel cylinder heads share an intake port 7, 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.

[0049] Through the above arrangement, two adjacent air intake passages 2 share one air intake port 7, and two air intake passages 2 can be installed in a limited space. At the same time, the use of one air intake port 7 increases the area of ​​the air intake port 7 of the air intake passage 2, increases the flow coefficient, and is conducive to increasing 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.

[0050] It should be understood that the projection of the intake passage 2 on the top surface of the cylinder head 1 may be in a straight line or in an arc shape. 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 arc-shaped.

[0051] Since the intake duct 2 shares an intake port 7, there is a distance between the intake port 7 of the intake duct 2 and the outlet end of the intake duct 2 along the radial direction of the cylinder. In this embodiment, when the mixed gas enters the intake duct 2 from the intake manifold, the arc-shaped setting allows a smooth transition between the intake duct 2 and the intake manifold, avoiding sharp corners and angles, so that the mixed gas can smoothly enter the intake duct 2.

[0052] like Figure 3 As shown, in one embodiment, the gas engine further comprises a combustion chamber 8 matched with the cylinder head 1, 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.

[0053] 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 guide of the spherical surface to form a tumble flow in the combustion chamber 8. It 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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. An arc-shaped center-cross cylinder straight airway cylinder head, characterized in that: include: The cylinder head is a flat top cylinder head; Two intake ducts are tumble flow ducts and are connected to the cylinder head. The connecting parts of the two intake ducts and the cylinder head are arranged at intervals, and the two intake ducts gradually move away from each other in a direction away from the cylinder head.

2. The arc-shaped center-cross-cylinder straight airway cylinder head 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 straight channel cylinder head according to claim 2, characterized in that: It also includes two exhaust passages, the two exhaust passages are connected to the cylinder head, a second center plane is provided between the two intake passages and the two exhaust passages, the second center plane passes through the axis of the cylinder head, and in the projection of the intake passage on the second center plane, a side of the intake passage 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 range of the angle θ2 between the first straight line segment and the top surface of the cylinder head is 0° to 15°, the range of the angle R1 of the first arc segment is 80 mm to 100 mm, and the range of the angle θ1 between the second straight line segment and the top surface of the cylinder head is 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 arc-shaped center-cross-cylinder straight airway cylinder head according to claim 3 is characterized in that: The two exhaust passages gradually approach each other in a direction away from the cylinder head.

5. The arc-shaped center-cross-cylinder straight airway cylinder head according to claim 3, characterized in that: A first center plane is defined between the two intake passages, the first center plane passes through the axis of the cylinder head, and the two intake passages are symmetrically distributed along the first center plane.

6. The arc-shaped center-cross-cylinder straight airway cylinder head according to claim 5, characterized in that: The two exhaust passages are symmetrically distributed along the first central plane.

7. The arc-shaped center-cross-cylinder straight airway cylinder head according to claim 3 is characterized in that: The connection point between the intake passage and the cylinder head and the connection point between the exhaust passage and the cylinder head are symmetrical along the second center plane.

8. A gas engine, characterized in that: It comprises the cylinder head with an arc-shaped center-cross-cylinder straight air passage 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 cylinder heads with arc-shaped center-cross-cylinder straight air passages, two adjacent intake passages in the adjacent arc-shaped center-cross-cylinder straight air passage cylinder heads 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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