Ammonia fuel pre-combustion chamber capable of improving combustion stability
By designing the threaded sleeve and rotary part in the ammonia fuel pre-combustion chamber with the spoiler group, the problem of uneven mixture is solved, the combustion stability and ignition reliability are improved, and the flame propagation speed and ignition efficiency are enhanced.
Patent Information
- Application Number
- CN202510803576.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-17
- Publication Date
- 2025-08-01
AI Technical Summary
The mixture in the traditional ammonia fuel pre-combustion chamber is unevenly mixed with the ammonia fuel injected by the ammonia fuel injector, which affects the ignition reliability and combustion stability.
An ammonia fuel pre-combustion chamber including a pre-combustion chamber body is designed. Through the cooperation of the threaded sleeve and the rotating part, the spoiler group is driven to uniformly mix the mixture with the ammonia fuel, and a vortex field is formed when the piston is reset downward to ensure uniform diffusion of high-temperature and high-pressure jets, and to improve combustion stability and ignition reliability.
The uniform mixing of the mixture is achieved, combustion stability and ignition reliability are improved, and flame propagation speed and ignition efficiency are enhanced.
Smart Images
Figure CN120402220A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of internal combustion engine combustion, and particularly to an ammonia fuel pre-chamber for improving combustion stability. Background Art
[0002] As a zero-carbon energy carrier, ammonia fuel shows important application potential in the field of internal combustion engines due to its high energy density and mature storage and transportation infrastructure. In an internal combustion engine with an ammonia fuel pre-chamber, during the compression stroke, the piston in the main combustion chamber of the internal combustion engine moves upward to compress the mixed gas in the main combustion chamber into the ammonia fuel pre-chamber. The ammonia fuel pre-chamber injects ammonia fuel into its interior through an ammonia fuel injector to form a combustible mixture, and then the combustible mixture is ignited by a spark plug to form a high-temperature and high-pressure jet and sprayed into the main combustion chamber to ignite the compressed mixed gas in the main combustion chamber. However, in the traditional ammonia fuel pre-chamber, the mixed gas entering and the ammonia fuel injected by the ammonia fuel injector are often not evenly mixed, affecting the ignition reliability and combustion stability. Therefore, we propose an ammonia fuel pre-chamber for improving combustion stability. Summary of the Invention
[0003] The purpose of the present invention is to provide an ammonia fuel pre-chamber for improving combustion stability, which solves the technical problem that the mixed gas entering the existing ammonia fuel pre-chamber and the ammonia fuel injected by the ammonia fuel injector are often not evenly mixed, affecting the ignition reliability and combustion stability.
[0004] The present invention achieves the above purpose through the following technical solutions: An ammonia fuel pre-chamber for improving combustion stability, comprising a pre-chamber main body, the pre-chamber main body is arranged in a pre-chamber installation hole on the cylinder head, the pre-chamber installation hole is communicated with the main combustion chamber, the pre-chamber main body includes a fixed part fixed in the pre-chamber installation hole, and a rotating part rotatably sleeved at the lower end of the fixed part, a pre-chamber inner cavity is formed inside the rotating part, a pre-chamber injection hole communicating with the pre-chamber inner cavity is arranged at the bottom of the rotating part, an ammonia fuel injector and a spark plug are inserted on the fixed part, and one ends of the ammonia fuel injector and the spark plug both extend into the pre-chamber inner cavity, a cavity is opened in the fixed part, a threaded sleeve is rotatably penetrated through the axis of the cavity, a contact screw is threadedly inserted at the bottom end of the threaded sleeve, the bottom end of the contact screw movably penetrates through the bottom of the rotating part and is pushed up by the piston in the main combustion chamber, an elastic connecting piece for driving it to reset is sleeved on the outer wall of the contact screw, a transmission group for drivingly connecting the rotating part and the threaded sleeve is arranged in the cavity, and a spiral spoiler group is arranged in the pre-chamber inner cavity.
[0005] A further improvement lies in that a cylinder is also inserted on the fixing part. One end of the cylinder extends into the cavity. A piston part is arranged in the cylinder. The cylinder is provided with a one-way air inlet and a one-way air outlet. One end of the piston part is connected to the inner wall of one side of the cylinder through an elastic part, and the other end is connected with a pull rope. One end of the pull rope is wound around the outer wall of the threaded sleeve. The one-way air outlet is communicated with the annular shunt pipe through a pipeline. The shunt pipe is arranged in the cavity and sleeved outside the threaded sleeve. The bottom of the shunt pipe is provided with a one-way exhaust port communicated with the inner cavity of the pre-combustion chamber. When the contact screw rises to drive the threaded sleeve to rotate, the pull rope is wound up. The pull rope drives the piston part to move so that air enters the cylinder from the one-way air inlet. When the contact screw resets, the piston part compresses the air in the cylinder into the annular shunt pipe and discharges it into the inner cavity of the pre-combustion chamber from the one-way exhaust port.
[0006] A further improvement lies in that the transmission group includes a rotating shaft rotatably arranged in the cavity and located on one side of the threaded sleeve. A first gear is sleeved on the outer wall of the rotating shaft. A second gear meshing with the first gear is sleeved on the outer wall of the threaded sleeve. An activity port for a part of the outer wall of the first gear to extend out is opened on the side wall of the fixing part. An annular rack meshing with the first gear is embedded in the inner wall of the rotating part.
[0007] A further improvement lies in that an annular pre-combustion chamber cooling cavity is arranged in the wall thickness of the rotating part. The top of the annular pre-combustion chamber cooling cavity is provided with an annular ventilation groove opening penetrating the side wall of the rotating part. The annular ventilation groove opening is communicated with an annular heat dissipation groove opened on the inner wall of the pre-combustion chamber installation hole. The annular heat dissipation groove is also communicated with a plurality of groups of heat dissipation channels, and the heat dissipation channels penetrate the cylinder head.
[0008] A further improvement lies in that an auxiliary mechanism is also arranged above the annular ventilation groove opening on the outer wall of the rotating part. The auxiliary mechanism includes a fan blade group sleeved on the outer wall of the rotating part.
[0009] A further improvement lies in that the fan blade group includes an installation ring and a plurality of groups of fan blades arranged on the outer wall of the installation ring in an annular array. A magnetic ring is arranged on the inner wall of the installation ring. A magnetic part adsorbed with the magnetic ring is embedded on the outer wall of the rotating part. An installation frame is rotatably arranged on the outer wall of the installation ring, and the installation frame is fixed with the inner wall of the heat dissipation groove.
[0010] A further improvement lies in that an annular groove opening is opened at the top of the fixing part, and a plurality of groups of fixing parts for fixing the fixing part to the inner wall of the pre-combustion chamber installation hole are inserted into the inner wall of the annular groove opening.
[0011] A further improvement lies in that a plurality of groups of rolling balls contacting the outer wall of the rotating part are embedded in the inner wall of the pre-combustion chamber installation hole, and a sealing ring is arranged above the rolling balls. The sealing ring is embedded in the inner wall of the pre-combustion chamber installation hole for sealing the connection between the rotating part and the pre-combustion chamber installation hole.
[0012] The beneficial effects of the present invention are as follows: During the compression stroke of the present invention, the piston moves upward to push the contact screw upward, and then the contact screw drives the threaded sleeve to rotate. The threaded sleeve drives the rotating part to rotate relative to the fixed part through the transmission group. When the rotating part rotates, it cooperates with the spiral spoiler group to enable the mixture entering the inner cavity of the pre-combustion chamber to be efficiently and evenly mixed with the ammonia fuel injected by the ammonia fuel injector, forming a uniform combustible mixture, improving the stability of subsequent combustion and the reliability of ignition, effectively increasing the flame propagation speed at the same time. And when the piston moves downward and resets, the reverse rotation of the rotating part and the spoiler cooperate together to form an orderly eddy current field in the pre-combustion chamber, ensuring that the high-temperature and high-pressure jet presents a uniform spiral diffusion form when spraying out from the pre-combustion chamber injection hole, achieving the maximum contact area with the compressed mixture in the main combustion chamber and effectively improving the ignition efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the ammonia fuel pre-combustion chamber of the present invention installed in the pre-combustion chamber installation hole; Figure 2 It is a schematic structural diagram of the ammonia fuel pre-combustion chamber of the present invention; Figure 3 For the present invention Figure 2 Partial structural sectional view in.
[0014] In the figure: 1. Pre-combustion chamber installation hole; 101. Heat dissipation groove; 102. Heat dissipation channel; 2. Pre-combustion chamber main body; 21. Fixed part; 22. Rotating part; 23. Pre-combustion chamber injection hole; 3. Spoiler group; 4. Threaded sleeve; 5. Contact screw; 6. Elastic connecting piece; 7. Transmission group; 71. Gear one; 72. Gear two; 8. Ammonia fuel injector; 9. Spark plug; 10. Air cylinder; 11. Piston part; 12. Pulling rope; 13. Shunt pipe; 14. Pre-combustion chamber cooling cavity; 15. Venting slot; 16. Fan blade group; 17. Mounting bracket; 18. Magnetic part. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0015] The following further describes the present application in detail with reference to the drawings. It is necessary to point out here that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.
[0016] Embodiment 1 Please refer to the attached Figures 1 - 3, An ammonia fuel pre-chamber for improving combustion stability, comprising a pre-chamber main body 2 disposed in a pre-chamber mounting hole 1 on the cylinder head. The pre-chamber mounting hole 1 communicates with the main combustion chamber. The pre-chamber mounting hole 1 is usually disposed on the cylinder head, the cylinder head is disposed on the cylinder block, the cylinder block is of a box-like structure, a piston is slidably mounted in the cylinder block, and the cylinder head, the cylinder block wall and the piston form the main combustion chamber. The above-mentioned pre-chamber mounting hole 1, main combustion chamber, cylinder head, cylinder block and piston are all conventional structures in the art and will not be described in detail herein. Of course, the cylinder head usually also has structures such as intake valves, exhaust valves, intake ports and exhaust ports; The pre-chamber main body 2 includes a fixed portion 21 fixed in the pre-chamber mounting hole 1 and a rotating portion 22 rotatably sleeved on the lower end of the fixed portion 21. A bearing and a sealing ring are provided between the rotating portion 22 and the fixed portion 21 to ensure the sealing between the two while allowing them to rotate relative to each other. A pre-chamber cavity is formed inside the rotating portion 22. A pre-chamber injection hole 23 communicating with the pre-chamber cavity is provided at the bottom of the rotating portion 22. An ammonia fuel injector 8 and a spark plug 9 are inserted on the fixed portion 21. The ammonia fuel injector 8 and the spark plug 9 are both conventional structures in the art and will not be described in detail herein. One ends of the ammonia fuel injector 8 and the spark plug 9 both extend into the pre-chamber cavity. During the compression stroke, the piston moves upward to compress the mixed gas in the main combustion chamber. The mixed gas in the main combustion chamber is pressed into the pre-chamber cavity. Ammonia fuel is injected into the pre-chamber through the ammonia fuel injector 8 to form a combustible mixture suitable for ignition in the pre-chamber cavity. At the end of the compression stroke, when the piston is about to reach the top dead center, the spark plug 9 ignites the combustible mixture in the pre-chamber cavity to form a high-temperature and high-pressure jet. The high-temperature and high-pressure jet can only be sprayed into the main combustion chamber through the pre-chamber injection hole 23 and ignite the compressed mixed gas in the main combustion chamber to burn rapidly, and the pressure and temperature increase rapidly, pushing the piston to move downward; A cavity is opened in the fixed part 21, and a threaded sleeve 4 is provided through the axial rotation of the cavity. A bearing is provided at the connection between the threaded sleeve 4 and the fixed part 21. A contact screw 5 is threadedly inserted at the bottom end of the threaded sleeve 4. The bottom end of the contact screw 5 movably passes through the bottom of the rotating part 22 and is pushed up by the piston in the main combustion chamber. An elastic connecting piece 6 is sleeved on the contact screw 5 for driving it to reset. For example, one end of the elastic connecting piece 6 is connected to the contact screw 5 and the other end is connected to the rotating part 22. The elastic connecting piece 6 is preferably a high-temperature resistant spring, etc. A transmission group 7 for driving the rotating part 22 and the threaded sleeve 4 is provided in the cavity, and a spiral spoiler group 3 is provided in the inner cavity of the pre-combustion chamber; when the piston moves upward, it also pushes the contact screw 5 upward, and then the contact screw 5 drives the threaded sleeve 4 to rotate, and the threaded sleeve 4 drives the rotating part 22 to rotate relative to the fixed part 21 through the transmission group 7. This method has the following advantages: 1. When the rotating part 22 rotates, it cooperates with the spiral spoiler group 3 to enable the mixture entering the inner cavity of the pre-combustion chamber to be efficiently mixed with the ammonia fuel injected by the ammonia fuel injector 8, forming a uniform combustible mixture, thereby improving the stability of subsequent combustion; 2. The rotation of the inner cavity of the pre-combustion chamber in conjunction with the spoiler group 3 can enrich the air with higher density toward the periphery and converge the ammonia toward the center, which not only optimizes the concentration of the mixture in the ignition core area, but also effectively suppresses the tendency of knock; 3. It effectively improves the flame propagation speed; 4. When the piston descends and resets, the reverse rotation of the rotating part 22 cooperates with the spoiler group 3 to form an orderly vortex field in the inner cavity of the pre-combustion chamber, so that the high-temperature and high-pressure jet presents a uniform spiral diffusion shape when it is ejected from the pre-combustion chamber injection hole 23, achieving the maximum contact area with the compressed mixture in the main combustion chamber, effectively improving the ignition efficiency; Preferably, in order to prevent the contact screw 5 from rotating when it is pushed upward by the piston, a rectangular block can be provided at the bottom end of the contact screw 5, and a matching slot can be provided on the piston, so that the rotation of the contact screw 5 can be restricted, thereby ensuring that the contact screw 5 stably drives the threaded sleeve 4 to rotate; Preferably, the transmission group 7 of this embodiment includes a rotating shaft rotatably arranged in the cavity and located on one side of the threaded sleeve 4. The rotating shaft is rotatably arranged in the cavity using a bearing. A gear 71 is sleeved on the outer wall of the rotating shaft, and a gear 2 72 meshing with the gear 1 71 is sleeved on the outer wall of the threaded sleeve 4. When the threaded sleeve 4 rotates, the gear 1 71 is driven to rotate through the gear 2 72. The side wall of the fixed part 21 is provided with a movable opening for extending part of the outer wall of the gear 1 71. The inner wall of the rotating part 22 is embedded with an annular rack meshing with the gear 1 71. When the gear 1 71 rotates, it drives the annular rack, and then the annular rack drives the rotating part 22 to rotate relative to the fixed part 21.
[0017] Preferably, an annular notch is formed at the top of the fixing part 21 in this embodiment, and a plurality of groups of fixing pieces for fixing the fixing part 21 to the inner wall of the pre-chamber mounting hole 1 are inserted into the inner wall of the annular notch. The fixing piece is, for example, a bolt, which facilitates the installation of the ammonia fuel pre-chamber into the pre-chamber mounting hole 1 or the removal and maintenance from the pre-chamber mounting hole 1.
[0018] Preferably, a plurality of groups of balls in contact with the outer wall of the rotating part 22 are embedded in the inner wall of the pre-chamber mounting hole 1 in this embodiment, and a sealing ring is arranged above the balls. The sealing ring is embedded in the inner wall of the pre-chamber mounting hole 1 for sealing the connection between the rotating part 22 and the pre-chamber mounting hole 1. The wear between the rotating part 22 and the inner wall of the pre-chamber mounting hole 1 is reduced by the balls, and at the same time, the stable rotation of the rotating part 22 is ensured. The sealing ring is made of a high-temperature resistant material, which is used to prevent gas from leaking out from the connection between the pre-chamber mounting hole 1 and the rotating part 22. Further, a sealing ring can also be arranged on the outer wall of the fixing part 21.
[0019] Embodiment 2 Please refer to the attached Figures 2 - 3 Based on Embodiment 1, an air cylinder 10 is further inserted into the fixing part 21 in this embodiment. One end of the air cylinder 10 extends into the cavity. A piston member 11 is arranged in the air cylinder 10. The air cylinder 10 is provided with a one-way air inlet and a one-way air outlet, and one-way valves are arranged in the one-way air inlet and the one-way air outlet. One end of the piston member 11 is connected to the inner wall of one side of the air cylinder 10 through an elastic member (such as a spring, etc.), and the other end is connected with a pull rope 12. One end of the pull rope 12 is wound around the outer wall of the threaded sleeve 4. The one-way air outlet is communicated with the annular flow dividing pipe 13 through a pipeline. The flow dividing pipe 13 is arranged in the cavity and sleeved outside the threaded sleeve 4. A one-way exhaust port communicated with the inner cavity of the pre-chamber is arranged at the bottom of the flow dividing pipe 13, and a one-way valve is arranged in the one-way exhaust port; When the piston moves upward, the contact screw 5 rises and drives the threaded sleeve 4 to rotate, winding the pull rope 12. The pull rope 12 drives the piston member 11 to move, so that air enters the air cylinder 10 from the one-way air inlet; when the piston moves downward, the contact screw 5 resets under the action of the elastic member, the threaded sleeve 4 rotates in the reverse direction to unwind the pull rope 12, and then the piston member 11 compresses the air in the air cylinder 10 into the annular flow dividing pipe 13 and discharges it into the inner cavity of the pre-chamber from the one-way exhaust port when the contact screw 5 resets. In this way, the residual waste gas in the inner cavity of the pre-chamber during the previous combustion process is extruded into the main combustion chamber, so that the residual waste gas in the inner cavity of the pre-chamber is reduced or even cleared, effectively reducing the residual waste gas coefficient in the pre-chamber, and further improving the ignition stability of the pre-chamber and the combustion stability of the subsequent combustible mixture in the pre-chamber.
[0020] Embodiment 3 Please refer to the attached Figures 1 - 3, on the basis of Embodiment 1, an annular pre-combustion chamber cooling cavity 14 is provided inside the wall thickness of the rotating part 22 in this embodiment. The bottom end of the pre-combustion chamber cooling cavity 14 extends to the outside of the pre-combustion chamber injection hole 23, and the other end extends to the upper end of the rotating part 22. An annular ventilation slot 15 penetrating the side wall of the rotating part 22 is provided at the top end of the annular pre-combustion chamber cooling cavity 14. The annular ventilation slot 15 is communicated with an annular heat dissipation slot 101 opened on the inner wall of the pre-combustion chamber mounting hole 1. The annular heat dissipation slot 101 is also communicated with several groups of heat dissipation channels 102, and the heat dissipation channels 102 penetrate through the cylinder head. Because the inner wall surface of the bottom of the pre-combustion chamber cavity of the rotating part 22 is in direct contact with the combustion gas in the pre-combustion chamber cavity, and the outer wall surface of the bottom of the rotating part 22 is in direct contact with the combustion gas in the main combustion chamber, resulting in a relatively large thermal load at the bottom of the rotating part 22. Therefore, by setting the pre-combustion chamber cooling cavity 14, the annular ventilation slot 15, the annular heat dissipation slot 101 and the heat dissipation channels 102, the heat of the rotating part 22 is transferred outwards. At the same time, because the rotating part 22 also performs a rotational movement, the heat transfer efficiency of the contact surface is improved, and the heat dissipation efficiency is higher, preventing the rotating part 22 from cracking and ablation due to excessive thermal load and extending its service life.
[0021] Preferably, an auxiliary mechanism is further provided on the outer wall of the rotating part 22 in this embodiment and above the annular ventilation slot 15. The auxiliary mechanism includes a fan blade group 16 sleeved on the outer wall of the rotating part 22. Preferably, the fan blade group 16 can be configured to send outside air into the pre-combustion chamber cooling cavity 14 from the heat dissipation channels 102, the annular heat dissipation slot 101 and the annular ventilation slot 15 when the contact screw 5 drives the threaded sleeve 4 to rotate upwards; when the contact screw 5 drives the threaded sleeve 4 to reverse downwards, the fan blade group 16 reverses to export the heat of the pre-combustion chamber cooling cavity 14 to the outside from the annular heat dissipation slot 101, the annular ventilation slot 15 and the heat dissipation channels 102. Of course, the fan blade group 16 is not limited to this one; The fan blade group 16 includes a mounting ring and several groups of fan blades arranged on the outer wall of the mounting ring in an annular array. A magnetic ring is provided on the inner wall of the mounting ring, and a magnetic part 18 adsorbed with the magnetic ring is embedded on the outer wall of the rotating part 22. The mounting frame 17 is rotatably provided on the outer wall of the mounting ring through a bearing, and the mounting frame 17 is fixed to the inner wall of the heat dissipation slot 101. By means of the magnetic ring and the magnetic part 18, the auxiliary mechanism will not be taken out when the fixing part 21 and the rotating part 22 are disassembled. When installing, the magnetic part 18 on the rotating part 22 adsorbs with the magnetic ring, and the mounting ring and the fan blades can be driven to rotate when the rotating part 22 rotates.
[0022] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.
Claims
1. An ammonia fuel pre - combustion chamber for improving combustion stability, comprising a pre - combustion chamber main body (2), the pre - combustion chamber main body (2) is arranged in a pre - combustion chamber mounting hole (1) on the cylinder head, and the pre - combustion chamber mounting hole (1) is communicated with the main combustion chamber, characterized in that, The pre-chamber body (2) includes a fixing part (21) fixed in the pre-chamber mounting hole (1), and a rotating part (22) rotatably sleeved on the lower end of the fixing part (21). A pre-chamber inner cavity is formed inside the rotating part (22). A pre-chamber injection hole (23) communicating with the pre-chamber inner cavity is provided at the bottom of the rotating part (22). An ammonia fuel injector (8) and a spark plug (9) are inserted on the fixing part (21), and one ends of the ammonia fuel injector (8) and the spark plug (9) both extend into the pre-chamber inner cavity. A cavity is formed in the fixing part (21). A threaded sleeve (4) is rotatably penetrated through the axis of the cavity. A contact screw (5) is threadedly inserted at the bottom end of the threaded sleeve (4). The bottom end of the contact screw (5) movably penetrates through the bottom of the rotating part (22) and is pushed upward by a piston in the main combustion chamber. An elastic connecting piece (6) for driving the contact screw (5) to reset is sleeved on the contact screw (5). A transmission group (7) for drivingly connecting the rotating part (22) and the threaded sleeve (4) is provided in the cavity. A spiral spoiler group (3) is provided in the pre-chamber inner cavity.
2. The ammonia fuel pre-chamber according to claim 1, wherein, An air cylinder (10) is also inserted on the fixing part (21). One end of the air cylinder (10) extends into the cavity. A piston member (11) is provided in the air cylinder (10). The air cylinder (10) is provided with a one-way air inlet and a one-way air outlet. One end of the piston member (11) is connected to the inner wall of one side of the air cylinder (10) through an elastic member, and the other end is connected to a pull rope (12). One end of the pull rope (12) is wound around the outer wall of the threaded sleeve (4). The one-way air outlet is communicated with an annular shunt pipe (13) through a pipeline. The shunt pipe (13) is arranged in the cavity and sleeved outside the threaded sleeve (4). A one-way exhaust port communicating with the pre-chamber inner cavity is provided at the bottom of the shunt pipe (13); When the contact screw (5) rises to drive the threaded sleeve (4) to rotate, the pull rope (12) is wound up. The pull rope (12) drives the piston member (11) to move so that air enters the air cylinder (10) from the one-way air inlet. When the contact screw (5) resets, the piston member (11) compresses the air in the air cylinder (10) into the annular shunt pipe (13) and discharges it to the pre-chamber inner cavity through the one-way exhaust port.
3. The pre-combustion chamber for ammonia fuel according to claim 1, characterized in that, The transmission group (7) includes a rotating shaft rotatably arranged in the cavity and located on one side of the threaded sleeve (4). A first gear (71) is sleeved on the outer wall of the rotating shaft. A second gear (72) meshing with the first gear (71) is sleeved on the outer wall of the threaded sleeve (4). An activity port for a part of the outer wall of the first gear (71) to protrude is formed in the side wall of the fixing part (21). An annular rack meshing with the first gear (71) is embedded in the inner wall of the rotating part (22).
4. The ammonia fuel pre-chamber according to claim 1, wherein An annular pre-chamber cooling cavity (14) is provided in the wall thickness of the rotating part (22). An annular ventilation slot opening (15) penetrating through the side wall of the rotating part (22) is provided at the top end of the annular pre-chamber cooling cavity (14). The annular ventilation slot opening (15) is communicated with an annular heat dissipation slot (101) formed in the inner wall of the pre-chamber mounting hole (1). The annular heat dissipation slot (101) is also communicated with a plurality of groups of heat dissipation channels (102), and the heat dissipation channels (102) penetrate through the cylinder head.
5. The ammonia fuel pre-chamber according to claim 4, wherein, An auxiliary mechanism is further provided on the outer wall of the rotating part (22) and above the annular ventilation slot (15). The auxiliary mechanism includes a fan blade group (16) sleeved on the outer wall of the rotating part (22).
6. The ammonia fuel pre-chamber according to claim 5, characterized in that, The fan blade group (16) includes an installation ring and a plurality of groups of fan blades arranged on the outer wall of the installation ring in an annular array. A magnetic ring is provided on the inner wall of the installation ring. A magnetic part (18) adsorbed to the magnetic ring is embedded on the outer wall of the rotating part (22). An installation frame (17) is rotatably provided on the outer wall of the installation ring, and the installation frame (17) is fixed to the inner wall of the heat dissipation slot (101).
7. The pre-chamber for ammonia fuel according to claim 1, characterized in that, A circular groove is formed at the top of the fixing part (21), and a plurality of groups of fixing parts for fixing the fixing part (21) to the inner wall of the pre-chamber installation hole (1) are inserted into the inner wall of the circular groove.
8. The pre-chamber for ammonia fuel according to claim 1, characterized in that, A plurality of groups of balls in contact with the outer wall of the rotating part (22) are embedded in the inner wall of the pre-chamber installation hole (1), and a sealing ring is provided above the balls. The sealing ring is embedded in the inner wall of the pre-chamber installation hole (1) for sealing the connection between the rotating part (22) and the pre-chamber installation hole (1).