Hydrogen injection valve structure in medium-pressure cylinder

Abstract

The invention discloses an injection valve structure for direct injection of hydrogen in a medium-pressure cylinder. The injection valve structure comprises a shell and a buffer oil component installed in the shell. The buffering oil component comprises a buffering oil cavity assembly and a buffering cavity sealing assembly, the nozzle component is installed at the bottom of the shell, the electromagnetic valve component is arranged between the buffering oil component and the nozzle component, and the electromagnetic valve component controls the nozzle component to be opened and closed. Hydrogen enters a through hole of the gas inlet connector, enters a gas inlet space between the shell and the periphery of the buffer oil cavity through a hole section of the buffer oil cavity and a first gas inlet hole, then enters a center hole of a nozzle body from a plurality of second gas inlet holes of the nozzle body of the nozzle assembly, and is sprayed out through a nozzle part; the buffer oil cavity assembly is influenced by the oil pressure of buffer oil and the gas pressure to open and close the first air inlet hole.

Description

Technical Field

[0001] The invention belongs to the field of automobile parts manufacturing, in particular to a medium-pressure in-cylinder hydrogen direct injection injection valve structure. Background Art

[0003] Hydrogen-powered vehicles have become the first choice as zero-pollution vehicles. As a key executive component in the hydrogen engine supply system, the performance of the hydrogen injection valve has a significant impact on injection characteristics such as injection timing, injection duration, and injection mass flow rate. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a medium-pressure in-cylinder hydrogen direct injection valve structure that is easy to control, has a perfect structure, is durable and reliable, in order to address the problems that the hydrogen injection valve is difficult to control, has an imperfect structure, and is not durable and reliable, so as to make the service life of the hydrogen injector longer and more stable.

[0005] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0006] A medium-pressure in-cylinder hydrogen direct injection valve structure, comprising:

[0007] A housing, characterized in that it also includes:

[0008] A buffer oil component installed in the housing; the buffer oil component includes a buffer oil cavity assembly and a buffer cavity sealing assembly, and a gas passage space is provided between the outer periphery of the buffer oil cavity assembly and the inner periphery of the housing;

[0009] The buffer oil cavity assembly has a buffer oil cavity, and the buffer oil cavity has a hole section. The buffer cavity sealing assembly is slidably arranged in the hole section, and the hole section of the buffer oil cavity is divided into a buffer oil cavity and an air intake cavity. The air intake cavity is located at the upper part of the buffer cavity sealing assembly, and the buffer oil cavity is located at the lower part of the buffer cavity sealing assembly. A first air intake hole is arranged on the cavity wall of the air intake cavity; the buffer oil cavity is filled with buffer oil; the first air intake hole connects the air passage space with the hole section, and an air intake joint is installed on the hole section;

[0010] A nozzle component installed at the bottom of the housing, the upper portion of the nozzle component is connected to the lower end of the buffer oil assembly, a second air inlet hole is provided on the nozzle component, and the second air inlet hole is communicated with the air passage space;

[0011] An electromagnetic valve component is arranged between the buffer oil component and the nozzle component, and the electromagnetic valve component controls the opening and closing of the nozzle component; hydrogen enters the through hole of the air intake joint, passes through the hole section of the buffer oil cavity body and the first air intake hole, enters the air intake space between the shell and the outer periphery of the buffer oil cavity body, and then enters the central hole of the nozzle body from several second air intake holes of the nozzle body of the nozzle assembly, and is sprayed out by the nozzle component; the buffer oil cavity assembly is affected by the oil pressure and gas pressure of the buffer oil, and the first air intake hole is opened and closed.

[0012] In a preferred embodiment of the present invention, the buffer chamber sealing assembly includes an O-ring, a sliding ring, a buffer oil chamber spring lower seat, a sealing gasket, a buffer oil chamber plug, and a sealing ring support seat; the lower end of the buffer oil chamber plug is threadedly installed in the upper end of the through hole of the buffer oil chamber spring lower seat, and the sealing gasket is arranged between the flange of the buffer oil chamber plug and the upper end surface of the buffer oil chamber spring lower seat, and is compressed and sealed by the buffer oil chamber plug; the upper end of the sealing ring support seat is threadedly installed in the lower end of the through hole of the buffer oil chamber spring lower seat and is limited by the lower end surface of the buffer oil chamber spring lower seat; a circle groove is arranged between the buffer oil chamber spring lower seat and the sealing ring support seat, and a group of O-rings and sliding rings are arranged in the circle groove to play a reciprocating motion and sealing role.

[0013] In a preferred embodiment of the present invention, the solenoid valve component includes a coil component and an armature assembly, and the coil component drives the armature rod in the armature assembly to move through electromagnetic force to drive the nozzle component to open.

[0014] In a preferred embodiment of the present invention, the coil component and the housing are fixed by a pin to prevent rotation.

[0015] In a preferred embodiment of the present invention, a cover plate is provided between the electromagnet component and the buffer oil chamber assembly. The cover plate is a magnetic metal flat plate. A through hole is provided on the cover plate for the armature rod to pass through.

[0016] In a preferred embodiment of the present invention, a fine hole and a guide sleeve mounting hole are provided at the lower part of the buffer oil cavity, a guide sleeve is installed in the guide sleeve mounting hole, and a center hole is provided in the guide sleeve for the upper end of the armature rod to be inserted; a return spring seat is slidably arranged in the center hole, and a return spring is installed in the fine hole. The lower end of the return spring extends into the center hole and interacts with the upper end of the armature rod, and has a buffering effect on the armature rod together with the buffer oil entering the fine hole, thereby playing a role in buffering the conical surface of the valve stem and the conical surface of the nozzle body to reduce the impact wear.

[0017] By adopting the above technical scheme, compared with the existing hydrogen injection valve, the present invention adopts two flow channels. The first flow channel is the hydrogen injection flow channel. Hydrogen enters the through hole of the intake joint, enters the space between the shell and the outer periphery of the buffer oil cavity through the hole section and the intake hole of the buffer oil cavity, and then enters the center hole of the nozzle body from the several intake holes of the nozzle body of the nozzle assembly. When the electronic control unit issues an instruction, the coil component is energized, and the armature assembly moves downward under the action of the electromagnetic force, and the valve stem is driven downward by the armature rod. The valve stem moves through the upper end of the spring lower seat to limit the lower end surface of the spring upper seat. When the upper end of the spring upper seat fits the lower end surface of the spring upper seat, the valve stem is in a fully open state. Finally, hydrogen is ejected through the gap between the conical surface of the nozzle body and the conical surface of the valve stem, and finally passes through the air guide cap into the injection cylinder. At this time, the buffer oil cavity assembly is affected by the oil pressure of the buffer oil to seal the intake hole. When the power is off, the conical surface of the valve stem falls back to the conical surface of the nozzle body to seal. At this time, the buffer oil cavity assembly moves downward under the influence of gas pressure, opening the air inlet hole to re-intake air. The buffer oil and the return spring work together to play a buffering and damping role, thereby reducing the impact wear of the nozzle assembly conical surface and the valve stem conical surface when they fall and improve the durability of the injection valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a schematic diagram of the appearance of the hydrogen direct injection valve structure of the present invention.

[0019] Figure 2 for Figure 1 DD cross-sectional view.

[0020] Figure 3 This is a structural schematic diagram of the hydrogen direct injection valve structure of the present invention without the shell.

[0021] Figure 4 for Figure 3 DD cross-sectional view.

[0022] Figure 5 for Figure 3 EE cross-sectional view.

[0023] Figure 6 It is a schematic structural diagram of the nozzle body assembly of the present invention.

[0024] Figure 7 It is a schematic structural diagram of the armature assembly of the present invention.

[0025] Figure 8 This is a schematic diagram of the structure of the buffer cavity sealing assembly of the present invention. DETAILED DESCRIPTION

[0026] The structure of the present invention is further described in detail as follows in conjunction with the accompanying drawings:

[0027] like Figures 1 to 8 As shown, the in-cylinder hydrogen injector structure shown in the figure includes: a nozzle component 200, a copper pad 101, a guide cap 102, an O-ring and a retaining ring 103, a support ring 104, and a tight cap 105. The specific technical solution is as follows:

[0028] The nozzle component 200 includes a nozzle injection molding component 300 , an O-ring 201 , a buffer return spring 202 , a buffer oil chamber spring upper seat 203 , an air inlet connector 204 , and a housing 205 .

[0029] The nozzle injection molding part 300 is fastened to the buffer oil chamber spring upper seat 203 through the thread 200a, and the buffer oil chamber spring upper seat 203 is limited by the conical surface 200b; the nozzle injection molding part 300 is fastened to the air inlet joint 204 through the thread 200c, and is sealed by the O-ring 201, and the air inlet joint 204 is limited by the end surface 200d. The rod section at the upper part of the outer periphery of the air inlet joint 204 is equipped with an O-ring seal 103 and a support ring 10.

[0030] The nozzle injection molding component 300 is installed in the central hole of the shell 205. The upper and lower ends of the shell 205 are sealed with the nozzle injection molding component 300 through O-rings 205a and 205bb. The upper and lower ends of the shell 205 are limited by step surfaces 200ea and 200e.

[0031] The nozzle injection molding component 300 includes a nozzle assembly 310, an armature assembly 320, a buffer oil cavity assembly 330, a buffer cavity sealing assembly 340, a coil component 350, a guide sleeve 301, an adjustment gasket 302, a connecting sleeve 303, an iron core 304, a shell 305, a cover plate 306, a steel sleeve 307, a connector 308, and a positioning pin 309.

[0032] The nozzle assembly 310 is connected and fixed to the lower through hole 303a of the connecting sleeve 303 via a thread 310a, and an O-ring 310aa is installed at the thread 310a for sealing; an adjustment gasket 302 is provided between the upper step surface 303aa in the lower through hole 303a of the connecting sleeve 303 and the upper step surface 310ab of the thread 310a, and the adjustment gasket 302 is mainly used to adjust the upper and lower gaps of the armature 321.

[0033] An iron core 304 is disposed in the upper through hole 303 b of the connecting sleeve 303 , and the iron core 304 is attached to the lower end surface 310 b in the upper through hole 303 b of the connecting sleeve 303 .

[0034] A coil component 350 and a shell 305 are provided on the periphery of the iron core 304, an armature assembly 320 is provided on the upper end surface of the iron core 304, a cover plate 306 is provided on the upper end of the armature assembly 320, and a through hole 306a is provided on the cover plate 306. The through hole 306a is connected to the through hole 321a on the armature 321 and the through hole 304a of the iron core 304, and an armature rod 322 is provided in the through hole 304a of the iron core 304.

[0035] A buffer oil cavity assembly 330 is mounted on the cover plate 306; the buffer oil cavity assembly 330 is connected and fixed to the housing 305 via a thread 310c, and an O-ring 310ca is installed at the thread 310c for sealing; the housing 305 is fixed to the cover plate 306 and the buffer oil cavity assembly 330 via a pin 309 to prevent rotation.

[0036] The nozzle assembly 310 includes a nozzle body 311, a valve stem 312, an adjusting gasket 313, a spring lower seat 314, a spring 315, a spring upper seat 316, and an O-ring 317. The valve stem 312 is inserted into the center hole 311a of the nozzle body 311, and the valve stem 312 is sealed with the conical surface 311b of the nozzle body 311 through the conical surface 312a.

[0037] An adjusting gasket 313 is arranged on the inner hole end surface 310c of the nozzle body 311; a spring lower seat 314 is arranged on the upper end surface of the adjusting gasket 313; a spring 315 is arranged on the end surface 314a of the spring lower seat 314; the spring upper seat 316 is connected and fastened with the valve stem 312 through a thread 316a and compresses the spring 315, and the spring upper seat 316 is limited by the inner hole cone surface 316b and the outer cone surface 312b at the top of the valve stem 312; a plurality of air inlet holes 311d are arranged in the middle part of the nozzle body 311, and the inner ends of the air inlet holes 311d are connected to the central hole 311a of the nozzle body 311.

[0038] The buffer chamber sealing assembly 340 is slidably arranged in the hole section 331a of the buffer oil chamber body 331, and the hole section 331a of the buffer oil chamber body 331 is divided into a buffer oil chamber 331ab and an air intake chamber 331aa, wherein the air intake chamber 331aa is located at the upper part of the buffer chamber sealing assembly 340, the buffer oil chamber 331ab is located at the lower part of the buffer chamber sealing assembly 340, and the air intake hole 331b is arranged on the cavity wall of the air intake chamber 331aa. The buffer oil chamber 331ab is filled with buffer oil. The buffer chamber sealing assembly 340 includes an O-ring 341, a sliding ring 342, a buffer oil chamber spring lower seat 343, a sealing gasket 344, a buffer oil chamber plug 345, and a sealing ring support seat 346.

[0039] The lower end of the buffer oil chamber plug 345 is installed in the upper end of the through hole 343a of the buffer oil chamber spring lower seat 343 through a thread 340a, and the sealing gasket 344 is arranged between the flange 345a of the buffer oil chamber plug 345 and the upper end surface 343b of the buffer oil chamber spring lower seat 343, and is compressed and sealed by the buffer oil chamber plug 345.

[0040] The upper end of the sealing ring support seat 346 is installed in the lower end of the through hole 343a of the buffer oil chamber spring lower seat 343 through the thread 340b and is limited by the lower end surface 343c of the buffer oil chamber spring lower seat 343.

[0041] A circle groove 340c is arranged between the buffer oil chamber spring lower seat 343 and the sealing ring support seat 346, and a group of O-type sealing rings 341 and sliding rings 342 are arranged in the circle groove 340c to play a reciprocating motion and sealing role.

[0042] The armature assembly 320 includes an armature 321 and an armature rod 322; the armature 321 is made of magnetic stainless steel, the armature rod 322 is inserted into the center hole 321a of the armature 321, and is fitted through the center hole 321a, and is limitedly assembled through the end surface 321aa of the center hole 321a.

[0043] The buffer oil cavity assembly 330 mainly includes a buffer oil cavity 331, a guide sleeve 332, a return spring seat 333, a return spring 334, and O-rings 335 and 336. An air inlet 331b is provided on the hole section 331a of the buffer oil cavity 331.

[0044] A fine hole 331c and a guide sleeve mounting hole 331d are provided at the lower part of the buffer oil cavity 331, and the guide sleeve 332 is installed in the guide sleeve mounting hole 331d. A center hole 332a is provided in the guide sleeve 332, and the center hole 332a is aligned and communicated with the center hole 321a of the armature 321, so that the upper end of the armature rod 322 can be inserted. The return spring seat 333 is slidably arranged in the center hole 332a, and the return spring 334 is installed in the fine hole 331c. The lower end of the return spring 334 extends into the center hole 332a and interacts with the upper end of the armature rod 322, and the buffer oil entering the fine hole 331c plays a buffering role on the armature rod 322, thereby playing a role in buffering the conical surface 312a of the valve stem 312 and the conical surface 311b of the nozzle body 311 to reduce the impact wear.

[0045] The coil component 350 includes a coil frame 351 and a coil 352. The coil 352 is arranged inside the coil frame 351, and the coil 352 is wound by a winding method and finally sealed as a whole.

[0046] Hydrogen enters the through hole 200f of the air inlet connector 204, enters the air space 200i between the housing 205 and the outer periphery of the buffer oil cavity 331 through the hole section 331a and the air inlet hole 331b of the buffer oil cavity 331, and then enters the central hole 311a of the nozzle body 311 from the plurality of air inlet holes 311d of the nozzle body 311 of the nozzle assembly 310. When the power is off, due to the compression force of the spring 315, the valve stem 312 is pulled upward by the spring 315 and the spring upper seat 316, so that the conical surface 312a of the valve stem 312 and the conical surface 311b of the nozzle body 311 are forced to fit together to form a seal. When the electronic control unit issues a command, the coil component 350 is energized, and the armature assembly 320 moves downward under the action of the electromagnetic force, and the valve stem 312 is driven downward by the armature rod 322. The valve stem 312 moves through the upper end of the spring lower seat 314 to limit the lower end surface 316a of the spring upper seat 316. When the upper end of the spring upper seat 316 fits the lower end surface 316a of the spring upper seat 316, the valve stem 312 is in a fully open state. Finally, hydrogen is ejected through the gap between the conical surface 311b of the nozzle body 311 and the conical surface 312a of the valve stem 312, and finally passes through the air guide cap into the injection cylinder. At this time, the buffer oil cavity assembly 330 is affected by the oil pressure of the buffer oil and seals the air inlet hole 331b. When the power is off, the conical surface 312a of the valve stem 312 falls back to the conical surface 311b of the nozzle body 311 for sealing. At this time, the buffer oil cavity assembly 330 moves downward under the influence of the gas pressure, and the air inlet hole 331b is opened to re-intake air.

[0047] The medium-pressure cylinder hydrogen direct injection valve structure of the present invention has a large flow cross-sectional area when it is open and the injection hole is made of high-temperature resistant material, so it can directly inject hydrogen into the combustion chamber of the internal combustion engine. In addition, the electromagnetic force of the electromagnet component design is much greater than the force of the spring tension, so it can be opened more evenly and the injection flow is also uniform and stable when it is opened, which is more conducive to the mixing of gas in the engine.

[0048] By adopting the above technical solution, compared with the existing gas injection valve, the present invention can use a higher pressure under the same flow area due to the use of a balanced valve structure. In addition, the outward-opening injection valve structure can not only obtain a larger injection cone angle, but also play a role in heat insulation when closed, and can protect the internal sealing ring. Therefore, the present invention can directly inject gas into the cylinder during the compression stroke, which can avoid the backfire problem of PFI. At the same time, the volume efficiency loss caused by the gas replacing air caused by the PFI injection method can also be solved. In addition, due to the use of high injection pressure, higher energy can be provided within the same injection duration, and higher load can be achieved.

Claims

1. A medium-pressure cylinder hydrogen direct injection valve structure, comprising: A housing, characterized in that it also includes: A buffer oil component installed in the housing; the buffer oil component includes a buffer oil cavity assembly and a buffer cavity sealing assembly, and a gas passage space is provided between the outer periphery of the buffer oil cavity assembly and the inner periphery of the housing; The buffer oil cavity assembly has a buffer oil cavity, and the buffer oil cavity has a hole section. The buffer cavity sealing assembly is slidably arranged in the hole section, and the hole section of the buffer oil cavity is divided into a buffer oil cavity and an air intake cavity. The air intake cavity is located at the upper part of the buffer cavity sealing assembly, and the buffer oil cavity is located at the lower part of the buffer cavity sealing assembly. A first air intake hole is arranged on the cavity wall of the air intake cavity; the buffer oil cavity is filled with buffer oil; the first air intake hole connects the air passage space with the hole section, and an air intake joint is installed on the hole section; A nozzle component installed at the bottom of the housing, the upper portion of the nozzle component is connected to the lower end of the buffer oil assembly, a second air inlet hole is provided on the nozzle component, and the second air inlet hole is communicated with the air passage space; An electromagnetic valve component is arranged between the buffer oil component and the nozzle component, and the electromagnetic valve component controls the opening and closing of the nozzle component; hydrogen enters the through hole of the air intake joint, passes through the hole section of the buffer oil cavity body and the first air intake hole, enters the air intake space between the shell and the outer periphery of the buffer oil cavity body, and then enters the central hole of the nozzle body from several second air intake holes of the nozzle body of the nozzle assembly, and is sprayed out by the nozzle component; the buffer oil cavity assembly is affected by the oil pressure and gas pressure of the buffer oil, and the first air intake hole is opened and closed.

2. The medium-pressure in-cylinder hydrogen direct injection valve structure according to claim 1 is characterized in that: The buffer chamber sealing assembly includes an O-ring, a sliding ring, a buffer oil chamber spring lower seat, a sealing gasket, a buffer oil chamber plug, and a sealing ring support seat; the lower end of the buffer oil chamber plug is threadedly installed in the upper end of the through hole of the buffer oil chamber spring lower seat, and the sealing gasket is arranged between the flange of the buffer oil chamber plug and the upper end surface of the buffer oil chamber spring lower seat, and is compressed and sealed by the buffer oil chamber plug; the upper end of the sealing ring support seat is threadedly installed in the lower end of the through hole of the buffer oil chamber spring lower seat and is limited by the lower end surface of the buffer oil chamber spring lower seat; a circle groove is arranged between the buffer oil chamber spring lower seat and the sealing ring support seat, and a group of O-rings and sliding rings are arranged in the circle groove to play a reciprocating motion and sealing role.

3. A medium-pressure in-cylinder hydrogen direct injection valve structure according to claim 1 or 2, characterized in that: The solenoid valve component includes a coil component and an armature assembly. The coil component drives the armature rod in the armature assembly to move through electromagnetic force to drive the nozzle component to open.

4. The medium-pressure in-cylinder hydrogen direct injection valve structure according to claim 2 is characterized in that: The coil component and the housing are fixed by a pin to prevent rotation.

5. The medium-pressure in-cylinder hydrogen direct injection valve structure according to claim 4 is characterized in that: A cover plate is arranged between the electromagnet component and the buffer oil chamber assembly. The cover plate is a magnetic metal flat plate. A through hole is arranged on the cover plate for the armature rod to pass through.

6. The medium-pressure in-cylinder hydrogen direct injection valve structure according to claim 5 is characterized in that: A fine hole and a guide sleeve mounting hole are provided at the lower part of the buffer oil cavity, a guide sleeve is installed in the guide sleeve mounting hole, and a center hole is provided in the guide sleeve for the upper end of the armature rod to be inserted; a return spring seat is slidably arranged in the center hole, and a return spring is installed in the fine hole. The lower end of the return spring extends into the center hole and interacts with the upper end of the armature rod, and has a buffering effect on the armature rod together with the buffer oil entering the fine hole, thereby playing a role in buffering the conical surface of the valve stem and the conical surface of the nozzle body to reduce the impact wear.

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