High-power gas engine cylinder cover, engine and method
The gas engine cylinder head design with an active pre-chamber and separate intake/exhaust ports addresses heat transfer issues and improves combustion efficiency and engine performance by precise ignition control.
Patent Information
- Application Number
- CN202510516749.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2025-07-15
AI Technical Summary
In existing high-power gas engines, the mixture is heated by the high-temperature exhaust passage when passing through the transition tube seat, resulting in problems such as reduced power, increased gas consumption and higher exhaust temperature. At the same time, the combustion process control accuracy of the passive pre-combustion chamber is low.
A high-power gas engine cylinder head is designed, and it adopts an inlet and exhaust passage opposite arrangement, with a pre-combustion chamber and a gas supply passage inside, a gas check valve and spark plug are installed to form an active pre-combustion chamber, which is injected into the pre-combustion chamber by high-pressure gas and ignited in the compression stroke, achieving a precisely controlled combustion process.
It effectively avoids the mixture being heated by exhaust gas, improves combustion efficiency and speed, reduces emissions, and improves the overall performance of the gas engine.
Smart Images
Figure CN120312424A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of gas engines, and particularly to a cylinder head, an engine and a method for a high-power gas engine. Background Art
[0002] In the field of gas power generation such as natural gas, biogas, and low-concentration gas, high-power gas engines are commonly used, such as the 6000 series 190 gas engines. Currently, the 6000 series 190 gas engines adopt an intake method of pre-mixing, supercharging, and intercooling before the compressor, that is, natural gas and air are mixed before the compressor, pressurized by a supercharger and then enter an intercooler for cooling, and then enter the air cavity at the top of the engine body, and finally enter the combustion chamber through the transition pipe seat on the cylinder head. Since the intake passage and the exhaust passage on the engine cylinder head are arranged on the same side, the mixture will be heated by the adjacent high-temperature exhaust (about 600 °C) passage when passing through the transition pipe seat, resulting in a slightly higher temperature of the mixture entering the combustion chamber, thereby increasing the probability of problems such as reduced engine power, increased gas consumption, and increased exhaust gas temperature.
[0003] In addition, the 6000 series 190 gas engines usually adopt passive pre-chamber spark ignition. This technology can improve the power of the engine to a certain extent, reduce the exhaust gas temperature of the engine, and improve the engine efficiency. However, the combustion process in the pre-chamber is greatly affected by the working conditions of the main combustion chamber, and the control accuracy is relatively low. Summary of the Invention
[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a cylinder head, an engine and a method for a high-power gas engine, which can not only solve the problem of heating of the mixture entering the cylinder by high-temperature exhaust gas, but also have the function of an active pre-chamber, thereby improving the overall performance of the gas engine.
[0005] In order to achieve the above purpose, the present invention is realized through the following technical solutions:
[0006] In a first aspect, an embodiment of the present invention provides a cylinder head for a high-power gas engine. An intake passage is provided at one end of the cylinder head, and an exhaust passage is provided at the other end. The intake passage is used for inputting a mixture, and the exhaust passage is used for discharging exhaust gas; a pre-chamber is provided in the cylinder head, and a spark plug is installed in the pre-chamber; an inclined gas supply passage is provided on one side of the pre-chamber, and a gas check valve is installed in the gas supply passage, and the gas check valve corresponds to the lower body of the pre-chamber.
[0007] During the compression stroke, high-pressure gas is sprayed into the gas check valve and then enters the pre-chamber; when the compression stroke approaches the top dead center, the spark plug ignites the mixture in the pre-chamber, and the flame sprays out from the lower body of the pre-chamber.
[0008] As a further implementation manner, the gas supply passage forms a set angle with the center line of the pre-chamber.
[0009] As a further implementation, the included angle is less than 45°.
[0010] As a further implementation, the spark plug is coaxially installed with the upper body and the lower body of the pre-chamber.
[0011] As a further implementation, a reduced opening is provided at the end of the lower body of the pre-chamber, and a plurality of flame outlets are evenly distributed on the circumferential side of the reduced opening.
[0012] As a further implementation, the intake passage and the exhaust passage are arranged oppositely and staggeredly.
[0013] As a further implementation, the gas supply passage is connected to a gas injection valve, and the gas injection valve is used to inject high-pressure gas into the gas one-way valve.
[0014] In a second aspect, an embodiment of the present invention further provides a high-power gas engine, including the cylinder head described above.
[0015] As a further implementation, it further includes a body, and a piston assembly is provided in the body; the cylinder head is installed on the top of the body;
[0016] The intake passage is connected to the engine intake pipe through the cylinder head intake pipe, and the engine intake pipe is connected to the outlet cavity of the intercooler.
[0017] In a third aspect, an embodiment of the present invention further provides a working method of a high-power gas engine, including:
[0018] Air and gas are mixed, then supercharged and intercooled, and then enter the cylinder head through the intake passage. During the compression stroke, high-pressure gas is sprayed into the gas one-way valve through the injection valve and then enters the pre-chamber, where it mixes with the air in the pre-chamber;
[0019] When the compression stroke approaches the top dead center, the spark plug ignites the mixture in the pre-chamber, and the flame sprays outwards through the lower body of the pre-chamber, causing the flame to spread throughout the main combustion chamber;
[0020] The mixture in the main combustion chamber burns quickly and completely, and the piston is pushed downward to complete the work. Finally, the piston moves upward to discharge the combustion exhaust gas through the exhaust passage.
[0021] The beneficial effects of the present invention are as follows:
[0022] (1) The cylinder head of the present invention has the intake passage and the exhaust passage arranged opposite to each other, avoiding the situation where the air-fuel mixture is heated by the exhaust gas. At the same time, a gas supply passage is provided on the side of the cylinder head for installing a gas one-way valve, and a pre-chamber is installed in the middle of the cylinder head, and a spark plug is installed in the pre-chamber. Thus, the gas one-way valve, the pre-chamber, and the spark plug form an active pre-chamber. Compared with the passive pre-chamber, the combustion process in the active pre-chamber can be precisely controlled, and the ignition time and combustion intensity can be adjusted according to the working conditions, which can improve the combustion efficiency and combustion speed, achieve lean combustion, reduce emissions, and thus improve the overall performance of the gas engine.
[0023] (2) The air flow transmission process of the present invention is as follows: The natural gas-air mixture is pressurized by the turbocharger, enters the intercooler through the intercooler intake cavity, is cooled by the intercooler, and then enters the engine intake pipe through the intercooler outlet cavity, and enters the cylinder head through the cylinder head intake pipe connected to the intake passage. The cylinder head intake pipe and the engine intake pipe form a relatively large loop with respect to the intercooler, which can play a certain heat dissipation function during the air flow transmission process, and further improve the performance of the gas engine. Brief Description of the Drawings
[0024] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.
[0025] Figure 1 is a schematic structural diagram of the cylinder head of the existing engine;
[0026] Figure 2 is a three-dimensional view of the cylinder head of the engine according to one or more embodiments of the present invention Figure 1 ;
[0027] Figure 3 is a three-dimensional view of the cylinder head of the engine according to one or more embodiments of the present invention Figure 2 ;
[0028] Figure 4 is a sectional view according to one or more embodiments of the present invention Figure 1 ;
[0029] Figure 5 is a sectional view of the pre-chamber sub-component according to one or more embodiments of the present invention;
[0030] Figure 6 is a sectional view according to one or more embodiments of the present invention Figure 2 ;
[0031] Figure 7 is a schematic diagram of the intake mode of the cylinder head according to one or more embodiments of the present invention;
[0032] Figure 8 It is a schematic diagram of the existing intake method of the cylinder head.
[0033] Among them, 1. intake passage; 2. exhaust passage; 3. gas check valve; 4. upper body of pre-chamber; 5. spark plug; 6. flame outlet; 7. lower body of pre-chamber, 8. cooling water cavity, 9. cylinder head, 10. turbocharger, 11. intake cavity of intercooler, 12. intercooler, 13. outlet cavity of intercooler, 14. engine intake pipe, 15. intake pipe of cylinder head, 16. intake elbow, 17. intake manifold cavity, 18. intake pipe of fuselage, 19. intake cavity at the top of fuselage, 20. transition pipe seat, 21. cylinder head. Specific embodiments
[0034] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.
[0035] Embodiment 1:
[0036] As Figure 1 shown, the intake passage and the exhaust passage of the 6000 series 190 gas engine are arranged on the same side of the cylinder head. This arrangement will cause the mixture gas to be heated by the adjacent high-temperature exhaust passage when passing through the transition pipe seat, affecting the engine performance.
[0037] Based on this, this embodiment provides a cylinder head for a high-power gas engine. As Figures 2 - 6 shown, an intake passage 1 is provided at one end of the cylinder head, and an exhaust passage 2 is provided at the other end. A cooling water cavity 8 is provided inside the cylinder head; both the intake passage 1 and the exhaust passage 2 face outward, that is, the intake passage 1 and the exhaust passage 2 are arranged oppositely, thus avoiding the situation where the mixture gas is heated by the exhaust gas. At the same time, the intake passage 1 and the exhaust passage 2 are not centered, that is, they are arranged in a dislocation manner, and this arrangement takes into account the installation space of the cylinder head.
[0038] As Figure 4 shown, a pre-chamber is provided inside the cylinder head. The pre-chamber is arranged vertically. As Figure 5 shown, the pre-chamber includes an upper body 4 of the pre-chamber and a lower body 7 of the pre-chamber. A spark plug 5 is provided inside the upper body 4 of the pre-chamber. The spark plug 5 is coaxially arranged with the pre-chamber. The spark plug 5 is used to ignite the mixture gas entering the pre-chamber, and the flame formed by the combustion of the mixture gas enters the main combustion chamber from the lower body 7 of the pre-chamber.
[0039] In this embodiment, the end of the lower body 7 of the pre-chamber has a reduced diameter opening, or rather, the diameter of the end of the lower body 7 of the pre-chamber gradually decreases to form a reduced diameter structure; and the longitudinal cross-sectional shape of the edge of the reduced diameter opening is arc-shaped. A plurality of flame outlets 6 are evenly distributed around the reduced diameter opening, and the flame formed by the combustion of the mixed gas sprays out from the flame outlets 6.
[0040] A gas supply passage is also provided inside the cylinder head, and a gas check valve 3 is installed in the gas supply passage. The gas supply passage is arranged on one side of the pre-chamber and is inclined, and a certain angle is formed between the gas supply passage and the center line of the pre-chamber. The angle between the gas supply passage and the center line of the pre-chamber is less than 45°, so that high-pressure gas can enter the lower body 7 of the pre-chamber after the gas check valve 3 is turned on; the gas supply passage is communicated with the lower body 7 of the pre-chamber through a vertical passage. In this embodiment, the angle between the gas supply passage and the center line of the pre-chamber is 35°.
[0041] Among them, the high-pressure gas is sprayed into the gas check valve 3 through a gas injection valve connected to the gas supply passage; the end of the gas check valve 3 is close to the end section of the spark plug 5. Through this setting, the gas can enter the lower body 7 of the pre-chamber under the spark plug 5 through the gas check valve 3, which is convenient for the high-pressure gas to mix with the air in the pre-chamber.
[0042] The cylinder head of this embodiment has the intake passage 1 and the exhaust passage 2 arranged oppositely, avoiding the situation that the mixed gas is heated by the exhaust gas; at the same time, a gas supply passage is arranged on the side of the cylinder head for installing the gas check valve 3, and a mounting hole is arranged in the middle part of the cylinder head for installing the pre-chamber. A spark plug 5 is installed in the upper body 4 of the pre-chamber; in this way, the gas check valve 3, the pre-chamber, and the spark plug 5 form an active pre-chamber.
[0043] The cylinder head of this embodiment can not only solve the problem of heating the mixed gas entering the cylinder by the high-temperature exhaust gas, but also has the function of an active pre-chamber. Compared with the passive pre-chamber, the combustion process in the active pre-chamber can be precisely controlled, and the ignition time and combustion intensity can be adjusted according to the working conditions, which can improve the combustion efficiency and combustion speed, realize lean combustion, reduce emissions, and thus improve the overall performance of the gas engine.
[0044] Embodiment 2:
[0045] As Figure 8As shown in the figure, the cylinder head of the existing gas engine is connected to the intake cavity at the top of the fuselage through a transition pipe seat. Its working process is as follows: The natural gas-air mixture is pressurized by the turbocharger 10 and then aggregated into the intake manifold cavity 17 through the intake elbows 16 on both sides. Subsequently, it enters the intercooler 12 for cooling. The cooled mixture passes through the fuselage intake pipe 18 and enters the intake cavity 19 at the top of the fuselage. Finally, it enters the cylinder head 21 through the transition pipe seat 20 connected to the outlet of the intake cavity 19 at the top of the fuselage. In the above manner, the mixture will be heated by the adjacent high-temperature exhaust passage when passing through the transition pipe seat 20, resulting in a relatively high temperature of the mixture entering the combustion chamber, which affects the engine performance; and the above pipeline layout is not conducive to the heat dissipation of the mixture during the transmission process.
[0046] This embodiment provides a high-power gas engine, including a fuselage. The cylinder head 9 described in Embodiment 1 is installed on the fuselage. A piston assembly is installed in the fuselage. The piston assembly includes components such as a piston, piston rings, and a connecting rod. The piston moves up and down in the fuselage and is connected to the crankshaft through the connecting rod to convert the pressure generated by combustion into rotational power.
[0047] As Figure 7 As shown in the figure, the intake passage 1 of the cylinder head 9 is connected to the engine intake pipe 14 through the cylinder head intake pipe 15, and the engine intake pipe 14 is connected to the intercooler 12. Its air flow transmission process is as follows: The natural gas-air mixture is pressurized by the left and right turbochargers 1 and then enters the intercooler 12 through the intercooler intake cavity 11. After being cooled by the intercooler 12, it enters the left and right engine intake pipes 14 respectively through the intercooler outlet cavity 13, and finally enters the cylinder head 4 through the cylinder head intake pipe 15 connected to the intake passage 1 of the cylinder head 9.
[0048] Since the intake passage 1 and the exhaust passage 2 of the cylinder head 9 are on different sides, the mixture will not be heated by the exhaust gas; at the same time, the pipelines (cylinder head intake pipe 15, engine intake pipe 14) connected to the cylinder head 9 form a relatively large loop with respect to the intercooler 12, which can play a certain heat dissipation function during the air flow transmission process and further improve the performance of the gas engine.
[0049] Embodiment 3:
[0050] This embodiment provides a working method for a high-power gas engine. The gas engine described in Embodiment 2 is adopted. After air and gas are mixed and supercharged and intercooled, they enter the cylinder head through the intake passage 1, enter the combustion chamber during the intake stroke, and then the mixture is compressed during the compression stroke. During the compression stroke, high-pressure gas is sprayed into the gas check valve 3 through the injection valve and then enters the pre-combustion chamber to mix with the air in the pre-combustion chamber. When the compression stroke approaches the top dead center, the spark plug 5 ignites the mixture in the pre-combustion chamber, and the flame sprays outwards through the bottom flame outlet 6 of the spark plug 5, so that the flame spreads throughout the main combustion chamber, enabling the mixture in the main combustion chamber to burn quickly and completely and pushing the piston downward to complete the work. Finally, the piston moves upward to discharge the combustion exhaust gas through the exhaust passage 2.
[0051] The foregoing are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.
Claims
1. A cylinder head of a high-power gas engine, characterized in that, One end of the cylinder head is provided with an intake passage, and the other end is provided with an exhaust passage. The intake passage is used for inputting the air-fuel mixture, and the exhaust passage is used for discharging the exhaust gas. A pre-chamber is arranged in the cylinder head, and a spark plug is installed in the pre-chamber. A tilted gas supply passage is arranged on one side of the pre-chamber, and a gas check valve is installed in the gas supply passage. The gas check valve corresponds to the lower body of the pre-chamber. During the compression stroke, the high-pressure gas is sprayed into the gas check valve and then enters the pre-chamber. When the compression stroke approaches the top dead center, the spark plug ignites the air-fuel mixture in the pre-chamber, and the flame sprays out from the lower body of the pre-chamber.
2. A cylinder head of a high-power gas engine according to claim 1, characterized in that, The gas supply passage forms a set angle with the center line of the pre-chamber.
3. The cylinder head of a high-power gas engine according to claim 2, characterized in that, The angle is less than 45°.
4. A cylinder head of a high-power gas engine according to claim 1, characterized in that The spark plug is coaxially installed with the upper body and the lower body of the pre-chamber.
5. A cylinder head of a high-power gas engine according to claim 1 or 4, characterized in that, A constriction is arranged at the end of the lower body of the pre-chamber, and a plurality of flame outlets are evenly distributed on the periphery of the constriction.
6. The cylinder head of a high-power gas engine according to claim 1, characterized in that, The intake passage and the exhaust passage are arranged oppositely and offset.
7. A cylinder head of a high-power gas engine according to claim 1, characterized in that, The gas supply passage is connected to a gas injection valve, and the gas injection valve is used for injecting high-pressure gas into the gas check valve.
8. A high-power gas engine, characterized in that, It includes the cylinder head according to any one of claims 1-7.
9. A high-power gas engine according to claim 8, characterized in that It further includes a cylinder block, and a piston assembly is arranged in the cylinder block. The cylinder head is installed on the top of the cylinder block. The intake passage is connected to the engine intake pipe through the cylinder head intake pipe, and the engine intake pipe is connected to the outlet chamber of the intercooler.
10. A working method of a high-power gas engine according to claim 9, characterized in that, It includes: After the air and the gas are mixed and supercharged and intercooled, they enter the cylinder head through the intake passage. During the compression stroke, the high-pressure gas is sprayed into the gas check valve through the injection valve and then enters the pre-chamber, and is mixed with the air in the pre-chamber. When the compression stroke approaches the top dead center, the spark plug ignites the air-fuel mixture in the pre-chamber, and the flame sprays outwards through the lower body of the pre-chamber, so that the flame spreads in the entire main combustion chamber. The air-fuel mixture in the main combustion chamber burns quickly and completely and pushes the piston to move downward to complete the work. Finally, the piston moves upward to discharge the burned exhaust gas through the exhaust passage.