Long-life hydrogen injector for in-cylinder direct hydrogen injection internal combustion engine

Abstract

The invention relates to the technical field of hydrogen ejectors, and discloses a long-life hydrogen ejector for an in-cylinder direct hydrogen injection internal combustion engine, which comprises an air inlet joint, a coil assembly, a guide pipe, an air outlet joint, a movable core assembly, a valve assembly and a shell, the coil assembly is axially arranged at one end of the air inlet joint, and a lubricating component is arranged between the air inlet joint and the coil assembly; the guide pipe is arranged at one end of the coil assembly, a plurality of air inlets are formed in the outer wall of the guide pipe, the shell wraps the air inlet connector and the outer wall of the guide pipe, the air outlet connector is arranged at the end, away from the coil assembly, of the guide pipe, the movable core assembly is arranged in the coil assembly, the valve assembly is arranged in the guide pipe and the air outlet connector, and the movable core assembly is connected with the valve assembly. A combustion chamber is arranged at one end of the air outlet connector, and the air inlet connector, the shell, the guide pipe, the air outlet connector and the combustion chamber are communicated. The lubricating assembly lubricates the movable core assembly, so that the movable core assembly is prevented from being in dry friction motion all the time, abrasion of the movable core assembly is reduced, and the service life of the hydrogen ejector is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen injectors, and in particular to a long-life hydrogen injector for an in-cylinder direct-injection hydrogen internal combustion engine. Background Art

[0002] The research, development and design of hydrogen internal combustion engines focus on hydrogen injectors, hydrogen electronically controlled pressure reducers, crankcase ventilation, hydrogen internal combustion engine after-treatment systems, high-efficiency supercharging systems, special lubricants, etc. In addition, due to the fast combustion speed of hydrogen, high combustion explosion pressure, and large mechanical load on the engine, strength design is one of the development focuses.

[0003] The core structure of a general hydrogen injector is a normally closed high-speed solenoid valve. The main working principle is that when the hydrogen injector is energized, the electromagnetic coil generates an electromagnetic force to make the moving core assembly overcome the opening resistance such as spring force and friction force to move, the hydrogen injector opens, and hydrogen enters the hydrogen internal combustion engine through the hydrogen injector; when the power is off, the electromagnetic force disappears, the moving core is reset under the action of the reset spring, and the hydrogen injector is closed. At present, due to the particularity of the hydrogen medium, hydrogen cannot provide lubrication for the internal moving parts of the hydrogen injector like gasoline, diesel and other fuels. Therefore, the internal parts are always in dry friction motion, which makes the internal parts very easy to wear. At the same time, because the hydrogen injector will be subjected to the explosion pressure of the combustion chamber, the hydrogen injector is often opened by the explosion pressure, causing the internal parts of the hydrogen injector to be damaged by high temperature, high pressure gas or flame, making the seals very easy to fail, and the hydrogen injector has poor sealing. Therefore, the current hydrogen injectors generally have the problems of low life and poor sealing. For this reason, we propose a long-life hydrogen injector for direct injection hydrogen internal combustion engines to solve the above problems. Summary of the invention

[0004] The present invention is intended to provide a long-life hydrogen injector for an in-cylinder direct injection hydrogen internal combustion engine to solve the problem of short service life of the hydrogen injector.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a long-life hydrogen injector for an in-cylinder direct injection hydrogen internal combustion engine, comprising an intake joint, a coil assembly, a conduit, an outlet joint, a moving core assembly, a valve assembly and a shell, the coil assembly is axially arranged at one end of the intake joint, a lubrication component is arranged between the intake joint and the coil assembly, the conduit is arranged at the end of the coil assembly away from the intake joint, a plurality of air inlets are opened on the outer wall of the conduit, the shell is wrapped around the intake joint and the outer wall of the conduit, the outlet joint is arranged at the end of the conduit away from the coil assembly, the moving core assembly is arranged in the coil assembly, the coil assembly can make the moving core assembly move, the valve assembly is arranged in the conduit and the outlet joint, the valve assembly can isolate the hydrogen in the conduit, the moving core assembly is connected to the valve assembly, a combustion chamber is arranged at the end of the outlet joint away from the conduit, and the intake joint, the shell, the conduit, the outlet joint and the combustion chamber are connected.

[0006] The beneficial effects of this solution are as follows: the air inlet connector is used to connect hydrogen, thereby transporting hydrogen to the inside of the hydrogen injector, the conduit is used to install the valve assembly, the coil assembly is used to control the movement of the moving core assembly, and then the moving core assembly drives the valve assembly to move, the valve assembly is used to close the conduit, thereby preventing the flow of hydrogen, and the lubrication component lubricates the moving core assembly, thereby preventing the moving core assembly from being in dry friction motion all the time, reducing the wear of the moving core assembly, and increasing the service life of the hydrogen injector.

[0007] Preferably, as an improvement, the coil assembly includes a magnetic bracket, a pole shoe, a coil, a guide sleeve and a magnetic seat, the magnetic bracket is axially arranged at one end of the air inlet joint, the pole shoe is arranged on the inner wall of the end of the magnetic bracket away from the air inlet joint, the coil is axially arranged on the inner wall of the end of the magnetic bracket close to the pole shoe, the guide sleeve is arranged on the outer wall of the pole shoe, and the magnetic seat is axially arranged on the inner wall of the end of the magnetic bracket close to the air inlet joint.

[0008] The beneficial effect is that the magnetic bracket is used to install the pole shoes, coils, guide sleeves and magnetic seats, and can also concentrate the magnetic field and improve the magnetic effect. The pole shoes are used to expand the magnetic field distribution area so that the magnetic flux can be more evenly dispersed in the magnetic bracket. When the coil is energized, it can generate electromagnetic force. The magnetic seat is used to close the magnetic field, thereby increasing the electromagnetic performance. The guide sleeve is used to separate the pole shoes and the magnetic seat.

[0009] Preferably, as an improvement, the moving core assembly includes a moving core and a moving core pin, the moving core is arranged inside the magnetic conductive seat, the moving core pin is axially arranged between the coil assembly and the conduit, and one end of the moving core pin passes through the pole shoe to be connected to the moving core, and the other end is connected to the valve assembly.

[0010] The beneficial effect is that when the coil is energized, the coil generates electromagnetic force, so that the moving core moves under the action of the electromagnetic force, thereby driving the moving core pin to move, and the moving core pin is used to connect the valve assembly.

[0011] Preferably, as an improvement, the valve assembly includes a sealing gasket, a valve, a valve stem and a first spring, the sealing gasket is arranged on the inner wall of the upper end of the conduit, the valve stem is arranged at the end of the moving core pin away from the pole shoe, the valve is arranged on the outer wall of the valve stem, and the valve can abut against the sealing gasket, and the first spring is arranged between the valve and the air outlet joint, and is sleeved on the outer wall of the valve stem.

[0012] The beneficial effect is that the valve stem is connected to the moving core pin, thereby driving the valve on the outer wall of the valve stem to move, and the first spring is used to reset the valve so that the valve is always in contact with the sealing gasket. Since the sealing gasket is made of a soft material and the first spring exerts pressure on the valve, the valve is embedded in the sealing gasket, thereby forming a sealing ring on the inner wall of the conduit to block the flow of hydrogen.

[0013] Preferably, as an improvement, the lubrication assembly includes an oil storage chamber and a brake orifice plate. The oil storage chamber is opened at one end of the air inlet joint close to the coil assembly. The oil storage chamber is used to store lubricant. The brake orifice plate is arranged on the inner wall of the magnetic base. The brake orifice plate and the moving core are axially opened with a plurality of flow holes, which can transport lubricant. The outer wall of the moving core is opened with a plurality of annular grooves.

[0014] The beneficial effect is that the oil storage chamber is used to store lubricant, and by opening a flow channel hole in the radial direction of the brake orifice plate, the lubricant can contact the outer wall of the moving core through the flow channel hole, thereby avoiding dry friction between the moving core and the inner wall of the magnetic seat, and by opening a flow channel hole in the radial direction of the moving core, the pressure at both ends of the moving core is kept balanced, so that the moving core can move smoothly in the magnetic seat, and the annular groove can store a certain amount of lubricant, which is conducive to replenishing the lubricant when the moving core moves. At the same time, the opening of the annular groove can reduce the contact area between the moving core and the inner wall of the magnetic seat, further reducing friction.

[0015] Preferably, as an improvement, a mounting ring is provided on the outer wall of the moving core pin in the pole shoe, an O-ring is provided inside the mounting ring, the O-ring abuts against the inner wall of the pole shoe, a guide block is provided on the outer wall of the valve stem located in the air outlet joint, and the guide block abuts against the inner wall of the air outlet joint.

[0016] The beneficial effect is that the guide block allows the moving core pin to move axially only in the air outlet joint, thereby improving the stability of the moving core pin and further preventing the moving core from wearing in the magnetic seat. The mounting ring is used to install the O-ring, and the O-ring is squeezed by the mounting ring so that the O-ring abuts against the inner wall of the air outlet joint, thereby blocking the continued flow of the lubricant and preventing the lubricant from entering the conduit and affecting the normal reaction of hydrogen combustion.

[0017] Preferably, as an improvement, the inner wall of one end of the air outlet connector away from the conduit is set as a conical surface, and a rotating body is provided at the lower end of the valve stem, and the rotating body can abut against the conical surface of the air outlet connector.

[0018] The beneficial effect is that a sealing surface is formed by the rotating body at the lower end of the valve stem abutting against the conical surface. When the hydrogen in the combustion chamber is ignited, high-temperature and high-pressure gas will be generated in the combustion chamber, which will make the rotating body fit more closely to the conical surface of the gas outlet joint, thereby completing the sealing of the gas outlet joint, and realizing the separation of the high-temperature and high-pressure gas in the combustion chamber from the gas inside the hydrogen injector, thereby preventing the high-temperature and high-pressure gas from entering the hydrogen injector and damaging other components.

[0019] Preferably, as an improvement, a second spring is axially provided on the inner wall of the oil storage chamber, a brake pin is provided at the end of the second spring away from the air intake joint, a connecting hole is opened in the middle of the brake orifice plate, the end of the brake pin extending into the connecting hole can contact with the moving core pin, the elastic force of the first spring is greater than the elastic force of the second spring, there is a gap A between the brake pin and the brake orifice plate, there is a gap B between the moving core and the pole shoe, and the gap B is greater than the gap A.

[0020] The beneficial effect is that, by opening a connecting hole in the middle part of the brake orifice plate, the brake pin and the moving core pin can contact each other in the connecting hole, and the second spring provides pressure for the brake pin, so that the brake pin can abut against the brake orifice plate, and the elastic force of the first spring is greater than the elastic force of the second spring, so that the moving core pin can lift the brake pin through the connecting hole, thereby generating a reaction force on the moving core pin through the brake pin. In this process, since there is lubricant between the brake pin and the brake orifice plate, liquid adhesion force will be generated when the brake pin is separated from the brake orifice plate, which hinders the separation of the brake pin and the brake orifice plate, thereby further increasing the reaction force of the brake pin on the moving core pin, thereby reducing the wear between the rotating body of the valve stem and the conical surface of the air outlet joint, affecting the sealing effect between the valve stem and the air outlet joint.

[0021] Preferably, as an improvement, the outer diameter of the mounting ring, the outer diameter of the valve abutting against the sealing gasket, and the outer diameter of the rotating body abutting against the conical surface of the air outlet connector are all equal.

[0022] The beneficial effect is that by setting the outer diameter of the mounting ring, the outer diameter of the valve and the sealing gasket in contact, and the outer diameter of the rotating body of the valve stem to be equal, the changes in the air pressure of the two sealing surfaces formed by the rotating body and the conical surface and the O-ring and the inner wall of the conduit will not affect the force on the moving core pin and the valve stem, especially when the contact seal between the rotating body and the conical surface fails and the high-pressure gas in the combustion chamber enters the inside of the gas outlet joint, the force on the moving core pin and the valve stem will not be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic cross-sectional structural diagram of a hydrogen injector according to an embodiment of the present invention;

[0024] Figure 2 is a schematic cross-sectional structural diagram of a coil assembly according to an embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of the top view of the guide block according to an embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of the cross-sectional structure of the moving core according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following is further described in detail through specific implementation methods:

[0028] The figure marks in the drawings of the specification include: air inlet connector 1, conduit 2, air outlet connector 3, housing 4, magnetic bracket 5, pole shoe 6, coil 7, guide sleeve 8, magnetic seat 9, moving core 10, moving core pin 11, sealing gasket 12, valve 13, valve stem 14, first spring 15, oil storage chamber 16, brake orifice plate 17, flow channel hole 18, annular groove 19, O-ring 20, guide block 21, rotating body 22, second spring 23, brake pin 24, combustion chamber 25.

[0029] Example

[0030] The embodiment is basically as shown in the attached Figure 1-4 As shown, Figure 1 The long-life hydrogen injector for an in-cylinder direct injection hydrogen internal combustion engine shown in the figure comprises an intake joint 1, a coil assembly, a conduit 2, an outlet joint 3, a moving core assembly, a valve assembly and a shell 4. The coil assembly is axially arranged at the lower end of the intake joint 1, a lubrication component is arranged between the intake joint 1 and the coil assembly, the conduit 2 is axially arranged at the lower end of the coil assembly, a plurality of air inlets are opened on the outer wall of the conduit 2, the shell 4 is axially wrapped around the intake joint 1 and the outer wall of the conduit 2, the outlet joint 3 is axially arranged at the lower end of the conduit 2, the moving core assembly is axially arranged in the coil assembly, the valve assembly is axially arranged in the conduit 2 and the outlet joint 3, the moving core assembly is connected to the valve assembly, and the moving core assembly can drive the valve assembly to move axially, a combustion chamber 25 is fixedly installed at the lower end of the outlet joint 3, and the intake joint 1, the shell 4, the conduit 2, the outlet joint 3 and the combustion chamber 25 are connected, and the valve assembly can isolate the hydrogen in the conduit 2.

[0031] like Figure 2 The coil assembly shown includes a magnetic bracket 5, a pole shoe 6, a coil 7, a guide sleeve 8 and a magnetic seat 9. The magnetic bracket 5 is axially fixedly installed on the lower end of the air intake joint 1, the pole shoe 6 is fixedly installed on the inner wall of the lower end of the magnetic bracket 5, and the coil 7 is axially fixedly installed on the inner wall of the lower end of the magnetic bracket 5. The coil 7 can generate electromagnetic force when energized. The guide sleeve 8 is sleeved and installed on the outer wall of the upper end of the pole shoe 6, and the magnetic seat 9 is axially fixedly installed on the inner wall of the upper end of the magnetic bracket 5.

[0032] The moving core assembly includes a moving core 10 and a moving core pin 11. The moving core 10 is slidably installed inside the magnetic conductive seat 9. The moving core pin 11 is located at the inner wall of the pole shoe 6 and the conduit 2. The upper end of the moving core pin 11 passes through the pole shoe 6 and is fixedly connected to the inner wall of the moving core 10. The moving core pin 11 is located on the outer wall of the pole shoe 6 and is fixedly installed with a mounting ring. Of course, the mounting ring and the moving core pin 11 can be produced using one-piece molding technology. An O-ring 20 is sleeved inside the mounting ring, and the O-ring 20 abuts against the inner wall of the pole shoe 6. The O-ring 20 can also be replaced by a diaphragm, a retractable gas tank or other flexible sealing components. The O-ring 20 is squeezed by the mounting ring so that the O-ring 20 abuts against the inner wall of the air outlet connector 3, thereby blocking the continued circulation of the lubricant and preventing the lubricant from entering the conduit 2 and affecting the normal reaction of hydrogen combustion.

[0033] The valve assembly includes a sealing gasket 12, a valve 13, a valve stem 14 and a first spring 15. The sealing gasket 12 is fixedly installed on the inner wall of the upper end of the conduit 2. The sealing gasket 12 is made of a high-elasticity and high-temperature resistant sealing material. The valve stem 14 is fixedly installed on the lower end of the moving core pin 11. The valve 13 is fixedly installed on the outer wall of the valve stem 14. The cross-sectional view of the valve 13 is C-shaped. A sealing surface is formed when the valve 13 abuts against the sealing gasket 12. The upper end of the first spring 15 is fixedly connected to the lower end of the valve 13, and the lower end is fixedly installed on the inner wall of the air outlet joint 3. The first spring 15 is sleeved on the outer wall of the valve stem 14. The outer wall of one end of the valve stem 14 located at the air outlet joint 3 is fixedly installed with a guide block 21. Figure 3 The guide block 21 shown in the top view is triangular, and the three corners are chamfered. The three rounded corners are all in contact with the inner wall of the air outlet connector 3. The guide block 21 allows the moving core pin 11 to only move axially in the air outlet connector 3, thereby improving the stability of the moving core pin 11 when moving, and further preventing the moving core 10 from wearing in the magnetic base 9.

[0034] The lubrication assembly includes an oil storage chamber 16 and a brake orifice plate 17. The oil storage chamber 16 is opened in the middle of the lower end of the air inlet connector 1. The air inlet connector 1 is provided with an oil delivery hole connected to the oil storage chamber 16. The oil storage chamber 16 is used to store lubricant. The brake orifice plate 17 is fixedly installed on the inner wall of the magnetic base 9. Figure 4 The moving core 10 and the moving orifice plate shown in the figure are both uniformly provided with a plurality of flow channel holes 18 along the axial direction, and the flow channel holes 18 can deliver the lubricant to the surface of the moving core 10. Since the moving core 10 collides with the pole shoe 6 and the brake orifice plate 17 for a long time, it is easy to cause the moving core 10 to deform. The deformation of the moving core 10 will cause the distance between the pole shoe 6 and the brake orifice plate 17 to shorten, which is easy to cause the valve 13 to become stuck, and the flow of hydrogen cannot be effectively blocked. The lubricant is filled between the pole shoe 6 and the brake orifice plate 17 to avoid the moving core 1 0 directly collides with the pole shoe 6 and the brake orifice plate 17, thereby extending the service life of the moving core 10. A plurality of annular grooves 19 are axially provided on the outer wall of the moving core 10. By providing a flow channel hole 18 axially on the moving core 10, the pressure at both ends of the moving core 10 is balanced, so that the moving core 10 can move smoothly in the magnetic seat 9. The annular grooves 19 can store a certain amount of lubricant, which is beneficial to replenishing the lubricant when the moving core 10 moves. At the same time, the annular grooves 19 can reduce the contact area between the moving core 10 and the inner wall of the magnetic seat 9, thereby further reducing friction.

[0035] The inner wall of the lower end of the gas outlet connector 3 is set to a conical surface, and a rotating body 22 is fixedly installed at the lower end of the valve stem 14, and the rotating body 22 can abut against the conical surface of the gas outlet connector 3 to form a sealing surface. Of course, the rotating body 22 and the valve stem 14 can be generated by an integrated molding technology, and the rotating body 22 at the lower end of the valve stem 14 abuts against the conical surface to form a sealing surface. When the hydrogen in the combustion chamber 25 is ignited, high-temperature and high-pressure gas will be generated in the combustion chamber 25, which will make the rotating body 22 fit the conical surface of the gas outlet connector 3 more closely, thereby completing the sealing of the gas outlet connector 3, and realizing the separation of the high-temperature and high-pressure gas in the combustion chamber 25 from the gas inside the hydrogen injector, thereby preventing the high-temperature and high-pressure gas from entering the hydrogen injector and damaging other components.

[0036] A second spring 23 is axially fixedly installed on the inner wall of the upper end of the oil storage chamber 16, and a brake pin 24 is fixedly installed on the lower end of the second spring 23. A connecting hole is opened in the middle of the brake orifice plate 17, and the upper end of the moving core pin 11 extends into the connecting hole. One end of the brake pin 24 extending into the connecting hole can contact the moving core pin 11. The elastic force of the first spring 15 is greater than the elastic force of the second spring 23, so that the moving core pin 11 lifts the brake pin 24, thereby forming a gap A between the brake pin 24 and the brake orifice plate 17, and a gap B is formed between the moving core 10 and the pole shoe 6, and the gap B is greater than the gap A. By opening a connecting hole in the middle of the brake orifice plate 17, the brake pin 24 and the moving core pin 11 can contact in the connecting hole, and the second spring 23 provides pressure for the brake pin 24, so that the brake pin 24 can abut against the brake orifice plate 17. When the elastic force of the first spring 15 is greater than the elastic force of the second spring 23, the moving core pin 11 The brake pin 24 can be lifted up through the connecting hole, thereby generating a reaction force on the moving core pin 11 through the brake pin 24, so as to prevent the first spring 15 from immediately releasing the elastic force when the coil assembly stops being energized, causing the moving core 10 to hit the brake orifice plate 17, thereby causing deformation and wear to the moving core 10. At the same time, it can also reduce the wear between the rotating body 22 of the valve stem 14 and the conical surface of the air outlet joint 3, thereby improving the sealing between the rotating body 22 and the conical surface, and preventing high-temperature and high-pressure gas from entering the hydrogen injector and damaging other components. In this process, since there is lubricant between the brake pin 24 and the brake orifice plate 17, liquid adhesion force will be generated when the brake pin 24 is separated from the brake orifice plate 17, thereby hindering the separation of the brake pin 24 from the brake orifice plate 17, thereby further increasing the reaction force of the brake pin 24 on the moving core pin 11, thereby reducing the wear between the rotating body 22 of the valve stem 14 and the conical surface of the air outlet joint 3.

[0037] The outer diameter of the mounting ring, the outer diameter of the valve 13 abutting against the sealing gasket 12, and the outer diameter of the rotating body 22 of the valve stem 14 are all equal. Since the moving core pin 11 and the valve 13 pin are fixedly connected to form a whole, and the mounting ring of the outer wall of the moving core pin 11 is located on the inner wall of the pole shoe 6, and the valve 13 of the outer wall of the valve 13 pin is located on the inner wall of the conduit 2, and the rotating body 22 at the lower end of the valve 13 pin is located on the inner wall of the outlet joint 3, the gas pressures received by the mounting ring, the valve 13, and the rotating body 22 during movement are inconsistent, which affects the axial movement of the moving core pin 11 and the valve 13 pin, especially when the valve stem 14 rotates. When the sealing surface between the body 22 and the conical surface of the gas outlet joint 3 fails, the high-temperature and high-pressure gas of the combustion chamber 25 enters the gas outlet joint 3, causing the air pressure between the moving core pin 11 and the valve stem 14 to change, affecting the movement of the moving core pin 11 and the valve stem 14. In order to avoid inconsistent air pressure between the mounting ring, the valve 13 and the rotating body 22, the outer diameter of the mounting ring, the outer diameter of the valve 13 abutting against the sealing gasket 12, and the outer diameter of the rotating body 22 of the valve stem 14 are set to be equal, so that the change of air pressure will not affect the movement of the moving core pin 11 and the valve stem 14. The reasons are as follows:

[0038] When the mounting ring is inside the pole piece 6, it will be subjected to the upward gas pressure F1 generated by the chamber of the conduit 2. Since F1=P1×S1, where P1 is the gas pressure in the chamber of the conduit 2, and S1 is the force area of ​​the mounting ring, that is, S1=π×E×E÷4, where E is the diameter of the mounting ring, when the valve 13 is inside the conduit 2, it will be subjected to the downward gas pressure F2 generated by the chamber of the conduit 2. F2=P2×S2, where P2 is the gas pressure in the chamber of the conduit 2, and S2 is the force area of ​​the valve 13, that is, S2=π×D×D÷4, where D is the outer diameter of the valve 13 abutting against the sealing gasket 12. Since the mounting ring and the valve 1 3 are all subject to the air pressure generated by the chamber of the conduit 2, that is, P1=P2, so when E=D, F1=F2, similarly, the valve 13 will be subject to the upward air pressure F3 generated by the chamber of the air outlet connector 3, and the rotating body 22 will be subject to the downward air pressure F4 generated by the chamber of the air outlet connector 3, when the outer diameter of the valve 13 abutting against the sealing gasket 12 is equal to the outer diameter of the rotating body 22 of the valve stem 14, F3=F4, at this time, the air pressure of the whole formed by the moving core pin 11 and the valve stem 14 is in a balanced state, which will not affect the movement of the moving core pin 11 and the valve stem 14, avoiding malfunction of the hydrogen injector.

[0039] The specific implementation process is as follows:

[0040] When the coil 7 is energized, the coil 7 provides an electromagnetic force to move the moving core 10 downward, thereby driving the moving core pin 11 to push the valve stem 14 downward, so that the valve 13 compresses the first spring 15, and then the valve 13 is separated from the sealing gasket 12, so that hydrogen can enter the conduit 2 through the inlet connector 1. Since the outer wall of the moving core pin 11 is provided with an O-ring 20, the upward flow of hydrogen is prevented, so that the hydrogen flows from the lower end of the conduit 2 to the outlet connector 3. The downward moving valve stem 14 causes the rotating body 22 of its outer wall to separate from the conical surface of the outlet connector 3, so that the hydrogen flows into the combustion chamber 25. In the process of the moving core pin 11 moving downward In the process, the moving core pin 11 is separated from the brake pin 24, so that the brake pin 24 contacts with the brake orifice plate 17 under the action of the second spring 23. During this process, the flow channel hole 18 of the brake orifice plate 17 is always kept unobstructed, and the outflowing lubricant lubricates the surface of the moving core 10, which not only reduces the wear of the moving core 10 and the inner wall of the pole shoe 6, but also absorbs the kinetic energy generated by the moving core 10. At the same time, the lubricant flowing to the upper end of the mounting ring is also isolated by the O-ring 20 to prevent the lubricant from flowing into the conduit 2. When the moving core 10 contacts with the pole shoe 6, the moving core 10 stops moving. At this time, the valve 13 is opened to the maximum, allowing the hydrogen to flow quickly to the combustion chamber 25.

[0041] When the coil 7 stops being energized, the moving core 10 loses its electromagnetic force, and the first spring 15 provides elastic force to the valve 13, so that the valve 13 drives the valve stem 14 and the moving core pin 11 to move upward. Before the moving core 10 hits the brake orifice plate 17, the upper end of the moving core pin 11 first contacts the lower end of the brake pin 24. Under the action of the second spring 23, the brake pin 24 provides a reaction force to the moving core pin 11, thereby reducing the kinetic energy of the moving core 10 and avoiding the collision between the moving core 10 and the brake orifice plate 17. At the same time, the elastic force provided by the second spring 23 also avoids the collision between the rotating body 22 of the outer wall of the valve stem 14 and the conical surface of the gas outlet joint 3, thereby improving the service life of the sealing surface formed by the valve stem 14 and the gas outlet joint 3. When the valve 13 is completely pressed against the sealing gasket 12, the hydrogen is blocked in the conduit 2. At this time, the rotating body 22 of the valve 13 also abuts against the conical surface of the gas outlet joint 3 to form a sealing surface, thereby preventing the high-temperature and high-pressure gas in the combustion chamber 25 from entering the gas outlet joint 3, thereby improving the service life of the hydrogen injector.

[0042] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A long-life hydrogen injector for a direct-injection hydrogen internal combustion engine, characterized in that: It includes an air inlet joint, a coil assembly, a conduit, an air outlet joint, a moving core assembly, a valve assembly and a shell. The coil assembly is axially arranged at one end of the air inlet joint, a lubrication component is arranged between the air inlet joint and the coil assembly, the conduit is arranged at the end of the coil assembly away from the air inlet joint, a plurality of air inlets are opened on the outer wall of the conduit, the shell wraps the air inlet joint and the outer wall of the conduit, the air outlet joint is arranged at the end of the conduit away from the coil assembly, the moving core assembly is arranged in the coil assembly, the coil assembly can make the moving core assembly move, the valve assembly is arranged in the conduit and the air outlet joint, the valve assembly can isolate the hydrogen in the conduit, the moving core assembly is connected to the valve assembly, a combustion chamber is arranged at the end of the air outlet joint away from the conduit, and the air inlet joint, the shell, the conduit, the air outlet joint and the combustion chamber are connected.

2. A long-life hydrogen injector for a direct-injection hydrogen internal combustion engine according to claim 1, characterized in that: The coil assembly includes a magnetic bracket, a pole shoe, a coil, a guide sleeve and a magnetic seat. The magnetic bracket is axially arranged at one end of the air intake joint, the pole shoe is arranged on the inner wall of the end of the magnetic bracket away from the air intake joint, the coil is axially arranged on the inner wall of the end of the magnetic bracket close to the pole shoe, the guide sleeve is arranged on the outer wall of the pole shoe, and the magnetic seat is axially arranged on the inner wall of the end of the magnetic bracket close to the air intake joint.

3. A long-life hydrogen injector for a direct-injection hydrogen internal combustion engine according to claim 2, characterized in that: The moving core assembly includes a moving core and a moving core pin. The moving core is arranged inside the magnetic conductive seat. The moving core pin is axially arranged between the coil assembly and the guide tube. One end of the moving core pin passes through the pole shoe and is connected to the moving core, and the other end is connected to the valve assembly.

4. A long-life hydrogen injector for a direct-injection hydrogen internal combustion engine according to claim 3, characterized in that: The valve assembly includes a sealing gasket, a valve, a valve stem and a first spring. The sealing gasket is arranged on the inner wall of the upper end of the conduit, the valve stem is arranged at the end of the moving core pin away from the pole shoe, the valve is arranged on the outer wall of the valve stem, and the valve can abut against the sealing gasket. The first spring is arranged between the valve and the air outlet joint, and is sleeved on the outer wall of the valve stem.

5. A long-life hydrogen injector for a direct-injection hydrogen internal combustion engine according to claim 4, characterized in that: The lubrication assembly includes an oil storage chamber and a brake orifice plate. The oil storage chamber is opened at one end of the air inlet joint close to the coil assembly. The oil storage chamber is used to store lubricant. The brake orifice plate is arranged on the inner wall of the magnetic base. The brake orifice plate and the moving core are axially provided with a plurality of flow holes, which can transport lubricant. The outer wall of the moving core is provided with a plurality of annular grooves.

6. A long-life hydrogen injector for a direct-injection hydrogen internal combustion engine according to claim 5, characterized in that: The outer wall of the moving core pin in the pole shoe is provided with a mounting ring, and an O-ring is arranged inside the mounting ring, and the O-ring abuts against the inner wall of the pole shoe; the outer wall of the valve stem located in the air outlet joint is provided with a guide block, and the guide block abuts against the inner wall of the air outlet joint.

7. A long-life hydrogen injector for a direct-injection hydrogen internal combustion engine according to claim 6, characterized in that: The inner wall of one end of the air outlet joint away from the conduit is arranged as a conical surface, and a rotating body is arranged at the lower end of the valve rod, and the rotating body can abut against the conical surface of the air outlet joint.

8. A long-life hydrogen injector for a direct-injection hydrogen internal combustion engine according to claim 7, characterized in that: A second spring is axially provided on the inner wall of the oil storage cavity, a brake pin is provided at the end of the second spring away from the air intake joint, a connecting hole is opened in the middle of the brake orifice plate, the end of the brake pin extending into the connecting hole can contact with the moving core pin, the elastic force of the first spring is greater than the elastic force of the second spring, there is a gap A between the brake pin and the brake orifice plate, there is a gap B between the moving core and the pole shoe, and the gap B is greater than the gap A.

9. A long-life hydrogen injector for a direct-injection hydrogen internal combustion engine according to claim 8, characterized in that: The outer diameter of the mounting ring, the outer diameter of the valve abutting against the sealing gasket, and the outer diameter of the rotating body abutting against the conical surface of the air outlet joint are all equal.

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