CN114718772A

CN114718772A - Gas injection valve

Info

Publication number: CN114718772A
Application number: CN202210289808.0A
Authority: CN
Inventors: 邓飞; 何静; 欧阳玲湘; 黄民备; 龙美彪; 伍新义; 李成校
Original assignee: Nanyuediankong Hengyang Industrial Technology Co ltd
Current assignee: Nanyuediankong Hengyang Industrial Technology Co ltd
Priority date: 2022-03-23
Filing date: 2022-03-23
Publication date: 2022-07-08
Anticipated expiration: 2042-03-23
Also published as: CN114718772B

Abstract

The application discloses gas injection valve for controlling the release of gas in a gas engine, include: the valve rod, and the nozzle body, the electromagnetic control assembly and the air inlet assembly which are connected in sequence; a first through hole is formed in the nozzle body, and a second through hole is formed in the electromagnetic control assembly; one end opening of the first through hole is set as an assembly port, and the second through hole is coaxially communicated with the first through hole. The other end of the second through hole is communicated with the air inlet assembly, and the air inlet assembly is used for inputting fuel gas to the inside. Two ends of the valve rod are respectively arranged as a sealing end and a guiding end; the guide end penetrates through the assembly port and penetrates out of the second through hole. An elastic limiting mechanism is arranged in the first through hole, is sleeved on the valve rod and keeps the sealing end of the valve rod to be attached and sealed with the assembling port. When gas needs to be released, the electromagnetic control assembly can be electrified to drive the valve rod to increase the degree of compressing the elastic limiting mechanism, the joint seal is opened, and the gas is sprayed into the cylinder through the gap.

Description

Gas injection valve

Technical Field

The application relates to the field of automobile manufacturing, in particular to a gas injection valve.

Background

The quality of the performance of the gas injection valve as a key execution component in a gas supply system of a gas engine has a significant influence on injection characteristics such as injection timing, injection duration, injection mass flow rate and the like. At present, the air supply strategy widely used for the hydrogen internal combustion engine is air inlet channel injection, and due to the fact that the minimum ignition energy and the quenching distance of fuel gas are low, the injection mode can cause the problems of preignition, detonation, backfire and the like. On the other hand, hydrogen displaces air in the intake air, limiting the power density of the engine. It can be seen that the overall gas injection process is not stable enough and contains too many negative factors that affect combustion.

Therefore, how to provide a gas injection valve which is easy to control and has a perfect structure is a problem to be solved by the technical personnel in the field.

Disclosure of Invention

The application aims at providing the fuel gas injection valve which is convenient to control and complete in structure, and fuel gas injection is stable and controllable.

To achieve the above object, the present application provides a gas injection valve comprising: the valve rod, and the nozzle body, the electromagnetic control assembly and the air inlet assembly which are connected in sequence;

a first through hole is arranged in the nozzle body in a penetrating manner, and an assembly port is arranged at one end of the first through hole; a second through hole is arranged in the electromagnetic control assembly in a penetrating manner, and the second through hole is coaxially communicated with the first through hole; the gas inlet assembly is communicated with the other end of the second through hole so as to introduce gas into the gas inlet assembly;

two ends of the valve rod are respectively provided with a sealing end and a guiding end, and the guiding end enters from the assembling port and penetrates out of the second through hole; an elastic limiting mechanism is arranged in the first through hole, is sleeved on the valve rod and is sealed by the joint of a sealing end of the limiting valve rod and the assembling port;

the electromagnetic control assembly can drive the valve rod to compress the elastic limiting mechanism, so that the valve rod is opened, attached and sealed, and gas is released.

In some embodiments, the electromagnetic control assembly comprises: the magnetic control device comprises an armature, a limiting sleeve, an adjusting washer and a magnetic conduction mechanism;

the limiting sleeve is fixedly connected to the valve rod, and the bottom of the limiting sleeve is contacted with the elastic limiting mechanism; the armature is sleeved on the valve rod, and the adjusting washer is clamped between the armature and the limiting sleeve;

the magnetic conduction mechanism is arranged on the outer sides of the limiting sleeve and the armature in a surrounding mode to apply electromagnetic force to the armature, so that the limiting sleeve compresses the elastic limiting mechanism.

In some embodiments, the magnetic conductive mechanism comprises: the iron core is sleeved on the outer side of the limiting sleeve and partially surrounds the electromagnet assembly on the outer side of the iron core, and the iron core is used for conducting electromagnetic force generated by the electromagnet assembly to the armature.

In some embodiments, the resilient limiting mechanism comprises: the spring and the spring abutting plate are sleeved on the valve rod;

the bottom surface butt of spring first through-hole's inside mounting groove, the spring butt board is used for suppressing the top surface of spring.

In some embodiments, the valve rod is provided with a guide section near the sealing end, and the guide section is attached to the inner wall of the first through hole to ensure that the valve rod moves along a straight line.

In some embodiments, the solenoid control assembly further comprises: and the anti-rotation pin is connected to the outer side of the electromagnet assembly to prevent deflection.

In some embodiments, an air scoop assembly comprises: the gas inlet joint is used for inputting gas and the magnetic isolation sleeve is used for increasing electromagnetic force;

the magnetism isolating sleeve is sleeved on the outer side of the iron core and is in clearance fit with the armature; the upper end of the magnetism isolating sleeve is fixedly connected with the lower end of the air inlet joint.

In some embodiments, the armature, the guide section and the spring abutting plate are all provided with a circulation groove, and the circulation groove is arranged along the length direction of the valve rod to increase the circulation space of the fuel gas.

In some embodiments, the sealing end is provided as a ball sealing end and the assembly port is provided as a cone port, which cooperate to ensure uniform circumferential injection of the combustion gases.

In some embodiments, the outer portions of the nozzle body and the air inlet assembly are each fitted with a sealing ring.

Compared with the prior art, the electromagnetic control valve is provided with a valve rod, a nozzle body, an electromagnetic control assembly and an air inlet assembly which are connected in sequence; a first through hole is formed in the nozzle body, and a second through hole is formed in the electromagnetic control assembly; one end opening of the first through hole is set as an assembly port, and the second through hole is coaxially communicated with the first through hole. The other end of the second through hole is communicated with the air inlet assembly, and the air inlet assembly is used for inputting fuel gas to the inside. Two ends of the valve rod are respectively arranged as a sealing end and a guiding end; the guide end penetrates through the assembly port and penetrates out of the second through hole. An elastic limiting mechanism is arranged in the first through hole, is sleeved on the valve rod and keeps the sealing end of the valve rod to be attached and sealed with the assembling port. When gas needs to be released, the electromagnetic control assembly can be electrified to drive the valve rod to increase the degree of compressing the elastic limiting mechanism, the joint seal is opened, and the gas is sprayed into the cylinder through the gap.

This application directly sprays the gas to the cylinder during compression stroke, according to the order of starting a fire of each cylinder, adopts the electromagnetic drive mode, realizes the air feed to each cylinder ration at regular time. The air supply mode can avoid the conventional tempering problem, and simultaneously, the volume efficiency loss caused by the fact that the air is replaced by the fuel gas in the conventional injection mode can be solved. In addition, the utilization rate of gas in the gas tank is higher due to the adoption of lower in-cylinder direct injection pressure.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only the embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a first partial schematic structural view of a gas injection valve provided in an embodiment of the present application;

FIG. 2 is a second partial schematic structural view of a gas injection valve provided in an embodiment of the present application;

FIG. 3 is a third partial schematic structural view of a gas injection valve provided in the embodiment of the present application;

fig. 4 is a schematic overall structural diagram of a gas injection valve provided in an embodiment of the present application;

FIG. 5 is a fourth partial schematic structural view of a gas injection valve provided in the embodiment of the present application;

FIG. 6 is a schematic cross-sectional view of a valve stem provided in an embodiment of the present application;

FIG. 7 is a cross-sectional view of a spring abutting plate provided in an embodiment of the present application;

fig. 8 is a cross-sectional schematic view of an armature provided by an embodiment of the present application.

Wherein:

1-valve rod, 10-sealing end, 11-guiding section, 100-guiding end, 2-nozzle body, 20-first through hole, 200-assembly port, 3-electromagnetic control component, 30-second through hole, 31-armature, 32-limiting sleeve, 33-adjusting washer, 34-iron core, 35-electromagnet assembly, 36-anti-rotation pin, 37-yoke iron, 38-cover plate, 4-air inlet component, 41-air inlet joint, 42-magnetic isolation sleeve, 43-buffer spring, 5-elastic limiting mechanism, 51-spring, 52-spring abutting plate and 6-sealing ring.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In order to enable those skilled in the art to better understand the scheme of the present application, the present application will be described in further detail with reference to the accompanying drawings and the detailed description.

Referring to the attached fig. 1, fig. 1 is a schematic view of a first partial structure of a gas injection valve provided in an embodiment of the present application, and includes: the device comprises a valve rod 1, a nozzle body 2, an electromagnetic control assembly 3 and an air inlet assembly 4 which are connected in sequence; a first through hole 20 is formed in the nozzle body 2 in a penetrating manner along the length direction, and a second through hole 30 is formed in the electromagnetic control assembly 3 in a penetrating manner along the length direction; one of the ends of the first through-hole 20 is open and provided as a mounting port 200, and the solenoid control assembly 3 is attached to the end of the nozzle body 2 that faces away from the mounting port 200, and coaxially communicates the second through-hole 30 with the first through-hole 20. The other end of the second through hole 30 communicates with the intake port block 4, and the intake port block 4 is used for inputting gas into the formed communicating passage. Two ends of the valve rod 1 are respectively provided with a sealing end 10 and a guiding end 100; the outer surface of the guide end 100 may be provided with, but not limited to, a tapered surface for penetrating from the mounting port 200 into the communication passage until the tapered surface of the guide end 100 penetrates to the outside of the second through hole 30. Meanwhile, an elastic limiting mechanism 5 is arranged in the first through hole 20, and the elastic limiting mechanism 5 is sleeved on the valve rod 1 and keeps the sealing end 10 of the valve rod 1 to be attached and sealed with the assembling port 200.

When the gas injection valve is in a closed normal state, the gas inlet assembly 4 inputs gas into the communicating channel, the resultant force of high-pressure gas inside the communicating channel pushes the valve rod 1 along the direction of exiting from the communicating channel, but the elastic limiting mechanism 5 is compressed to a certain degree, the generated elastic force is applied to the valve rod 1 towards the direction of entering the communicating channel, and the elastic force is greater than the resultant force of the high-pressure gas, so that the sealing end 1 is maintained to be attached and sealed on the assembling port 200, and the input gas is ensured not to flow out. The stronger the elastic force is, the better the sealing effect is.

When the gas injection valve is to be opened, the electromagnetic control assembly 3 can be electrified and controlled to drive the valve rod 1 to increase the degree of compressing the elastic limiting mechanism 5 by utilizing the electromagnetic effect, so that the sum of the electromagnetic force and the thrust of high-pressure gas is greater than the elastic force, the joint seal is opened, and the gas can be injected into the cylinder through the gap between the seal end 10 and the assembling port 200.

The electromagnetic control component 3 is used for driving the direct injection system in the cylinder, and the air supply quantity can be controlled in a timing and quantitative mode. The sealing structure is not provided with a nonmetal sealing device, the flow area is large when the sealing structure is fully opened, and the heat resistance of the material extending into the combustion chamber is high, so that the gaseous medium can be directly sprayed into the combustion chamber of the internal combustion engine, and the mixing of gas in the engine is facilitated. In addition, the structure can directly spray fuel gas to the cylinders during the compression stroke, and realize the timing and quantitative gas supply of each cylinder by adopting an electromagnetic driving mode according to the ignition sequence of each cylinder. The air supply mode can avoid the conventional tempering problem, and simultaneously, the volume efficiency loss caused by the fact that the air is replaced by the fuel gas in the conventional injection mode can be solved. In addition, the utilization rate of gas in the gas tank is higher due to the adoption of lower in-cylinder direct injection pressure.

Further, referring to fig. 2 of the specification, fig. 2 is a second partial structural schematic diagram of a gas injection valve provided in an embodiment of the present application, including: the above-mentioned electromagnetic control assembly 3 comprises: the armature 31, the stop collar 32, the adjusting washer 33 and the magnetic conduction mechanism; the limiting sleeve 32 is sleeved on the valve rod 1, two ring grooves are formed in the surface of the limiting sleeve, and the limiting sleeve 32 and the valve rod 1 are fixedly connected through laser penetration welding; the armature 31 is also sleeved on the valve rod 1 and is arranged above the limit sleeve 32, an adjusting washer 33 is clamped between the armature 31 and the limit sleeve 32, and magnetic conducting mechanisms are arranged on the outer sides of the armature 31 and the limit sleeve 32; the bottom surface butt elasticity stop gear 5 of stop collar 32, when needing to open the gas injection valve, to circular telegram in the magnetic conduction mechanism, magnetic conduction mechanism will produce decurrent electromagnetic force and transmit armature 31, and armature 31 atress backward suppresses stop collar 32, because stop collar 32 links firmly on valve rod 1, consequently can drive valve rod 1 and move down wholly to put aside sealed end 10 and the sealed cooperation of assembling port 200.

The adjusting washers 33 are divided into different levels according to the height, and the stroke of the armature 31 can be precisely controlled by matching the adjusting washers 33 of different levels, so that the opening condition (namely the gas spraying condition) of the joint seal is indirectly controlled.

The fixing mode of the limiting sleeve 32 and the valve rod 1 is not limited to the above one, and the detailed description is omitted here.

Further, the magnetic conductive mechanism includes: iron core 34 and electromagnet assembly 35; the iron core 34 is made of a magnetic conductive material, is sleeved outside the limiting sleeve 32, and the lower end face of the iron core 34 is laser welded with the upper end face of the nozzle body 2; the electromagnet assembly 35 is a conventional electromagnet and coil combined structure, a part of the electromagnet assembly is surrounded on the outer side of the iron core 34, electricity is supplied to the electromagnet assembly 35, the electromagnet assembly 35 converts the electromagnetic force and transmits the electromagnetic force to the armature 31 through the iron core 34, and therefore electromagnetic driving is achieved.

Further, the elastic stopper mechanism 5 includes: the spring 51 is sleeved on the valve rod 1, a spring installation groove for installing and moving the spring 51 is formed in the first through hole 20, the bottom surface of the spring 51 is abutted to the installation groove, and a spring abutting plate 52 is arranged at the top end of the spring 51; the spring abutting plate 52 is installed between the stop collar 32 and the spring 51, and is responsible for initial pre-compression of the spring 51 during installation, so that the elastic force generated by deformation thereof can satisfy the sealing maintaining force of the sealing end 10 and the assembling port 200.

At the same time, the spring 51 closing the valve stem 1 is arranged at a larger position in the middle space of the entire injector, and the internal flow area can be increased. The reduced size of the injection end of the injector makes it easier to achieve placement on the engine cylinder head.

Further, referring to fig. 3 of the specification, fig. 3 is a third partial structural schematic diagram of a gas injection valve provided in an embodiment of the present application, including: the middle part of the valve rod 1

The rod section close to the sealing end 10 is set to be the guide section 11, the diameter of the guide section 11 is large, and a small fit clearance is kept between the guide section 11 and the inner wall of the first through hole 20, so that the guide section 11 is in fit contact with the first through hole 20 to ensure that the valve rod 1 moves up and down along the linear direction, and inclined hair clamping is avoided. Meanwhile, the arrangement close to the sealing end 10 can improve the coaxiality of the sealing end 10 and the assembling port 200, and the sealing performance is improved.

The diameter of above-mentioned valve rod 1 middle part guide section 11 is the biggest, and the diameter at its both ends is the minimum, and the diameter of middle part linkage segment is placed in the middle, because the interior wall space that its both ends were located is the minimum, reduces the diameter of rod and can increase the flow area of gas in the at utmost, and when getting into the linkage segment, the inner chamber space grow of locating can suitably increase the rigidity of valve rod 1 through setting up the rod diameter placed in the middle.

Further, referring to fig. 4-5 in the specification, fig. 4 is a schematic overall structural diagram of the gas injection valve provided in the embodiment of the present application, and fig. 5 is a schematic fourth partial structural diagram of the gas injection valve provided in the embodiment of the present application, including; the above-mentioned electromagnetic control assembly 3 also comprises injection-molded anti-rotation pins 36 for cooperating with conventional components such as electrical plugs, gas rails, etc., and for ensuring a stable injection process, the anti-rotation pins 36 being not further developed herein.

Meanwhile, a yoke 37 and a cover plate 38 can be arranged; the yoke 37 is made of metal flat roll paper, and the center is provided with a cylindrical center hole which is in interference fit with the outer wall of the iron core 34, so that the magnetic resistance is reduced; the cover plate 37 is sleeved on the outer side of the air inlet component 4 and is provided with a magnetic conductive metal plate to stabilize the device.

Further, the intake port assembly 4 includes: an air inlet joint 41 for connecting the input gas and a magnetic isolation sleeve 42 for increasing the electromagnetic force, wherein the air inlet joint 41 is coaxially arranged with the top end of the nozzle body 2. The magnetism isolating sleeve 42 is a thin-wall steel pipe, the lower end position of the magnetism isolating sleeve is sleeved and welded on the outer side of the iron core 34 through an annular outer ring groove, and the upper end face of the magnetism isolating sleeve is welded with the lower end face of the air inlet joint 41 into a whole. The inner wall of the magnetic isolation sleeve is in clearance fit with the armature 31, and the magnetic isolation sleeve 42 is made of a non-magnetic material, so that the magnetic isolation sleeve can ensure that small magnetic resistance does not have great influence on electromagnetic force and clamping stagnation is not generated due to over-positioning. Preferably, the diameters of the inner holes of the magnetic isolation sleeve 42 and the air inlet joint 41 are uniform, so that the manufacturing difficulty is reduced.

The air inlet joint 41 is made of a magnetic conductive material, a mounting hole is formed in the air inlet joint for mounting the buffer spring 43, and the buffer spring 43 is used for pressing the upper end face of the armature 31 to stabilize the joint of the armature and the adjusting washer 33.

The outer side of the middle of the air inlet joint 41 is also provided with an annular injection anti-falling groove to prevent plastic from being pulled upwards.

Further, referring to fig. 6-8 of the specification, fig. 6 is a schematic cross-sectional view of a valve stem provided in an embodiment of the present application, fig. 7 is a schematic cross-sectional view of a spring abutting plate provided in an embodiment of the present application, and fig. 8 is a schematic cross-sectional view of an armature provided in an embodiment of the present application, including: the armature 31, the guide section 11 and the spring abutting plate 52 are all provided with circulation grooves which are all arranged along the circulation direction of the fuel gas; the through groove of the armature 31 is preferably arranged in the inner hole and provided with two waist-shaped grooves, the through area can be increased through the design of the waist-shaped grooves, and the processing difficulty can be reduced by reducing the thickness of the waist-shaped grooves. A circular groove can be formed in the guide section 11 to increase the gas fluidity, and an annular groove of an outer ring can be coaxially formed in the spring abutting plate 52 to increase the flow area of the inner cavity to the maximum extent. Of course, the specific arrangement of the circulation groove is not limited to the above-mentioned several ways, and the structure modification according to the actual requirement is within the protection scope of the present application, and is not described herein again.

Further, above-mentioned sealed end 10 sets up to the sealed end of spheroid, and assembly port 200 sets up to the toper port, so set up when the sealed of the two is opened, can guarantee that the circumferential clearance between the two is even to make the gas evenly spray along the circumferencial direction, promote combustion quality. The assembling port 200 may be composed of an upper tapered surface and a lower tapered surface, the upper tapered surface has a smaller inclination angle than the lower tapered surface, and the lower tapered surface is used for sealing with the sealing end 10, so that the width of the lower tapered surface can be reduced, the processing is facilitated, and the number of matched throttling sections in the joint sealing can be reduced. Of course, the specific structure of the sealing end 10 and the assembling port 200 is not limited to the above, and will not be described herein.

Further, the sealing rings 6 are provided outside the nozzle body 2 and the intake port block 4, and specifically, the sealing rings may be provided with, but not limited to, a rectangular sealing groove and a ring groove provided outside the lower end of the nozzle body 2, and an O-ring and a rectangular ring provided on the upper end of the intake port block 4. Above-mentioned sealing washer 6 can select for use and not only be limited to for use polytetrafluoroethylene circle, and its leakproofness is good and easily acquisition, reduces equipment use cost.

In one embodiment, the assembly process for the gas injection valve is as follows:

first, assembling the jet valve assembly: the valve stem 1 is coaxially fitted into the first through-hole 20 from the lower end of the nozzle body 2 from the bottom up, so that the seal end 10 is fitted to the fitting port 200. Spring 51 is put into nozzle body 2, spring abutting plate 52 is sleeved on valve rod 1 and spring 51 is pre-pressed downwards until the set compression degree, stop collar 32 is installed on valve rod 1, the lower end face of stop collar 32 is in contact with the upper end face of spring abutting plate 52, and laser penetration welding is carried out on stop collar 32 and valve rod 1 through a ring groove.

In the second step, the nozzle body 2 is mounted to the lower portion of the iron core 34 and laser-welded along the lower edge of the iron core 34. The distance between the upper end face of the iron core 34 and the upper end face of the limiting sleeve 32 is measured, a proper adjusting washer 33 is selected to meet the stroke requirement of the armature 31, the selected adjusting washer 33 is installed on the valve rod 1, the adjusting washer 33 is in contact with the limiting sleeve 32, and the armature 31 is assembled on the valve rod 1.

And thirdly, contacting the lower end face of the air inlet joint 41 with the upper end face of the magnetism isolating sleeve 32, ensuring that the air inlet joint 41 and the magnetism isolating sleeve 32 are coaxial, and welding the air inlet joint 41 and the magnetism isolating sleeve 32 in a whole circle at a joint. Then the buffer spring 43 is arranged in the mounting hole of the air inlet joint 41, the central hole of the magnetic isolation sleeve 32 is coaxially arranged on the iron core 34, and the magnetic isolation sleeve 32 and the iron core 34 are welded into a whole through the ring groove of the magnetic isolation sleeve 32.

Fourthly, the yoke 37 is coaxially mounted on the iron core 34 so that the lower end face of the yoke 37 is in contact with the end face of the iron core 34. The electromagnet assembly 35 is coaxially installed in the magnetic isolation sleeve 32, so that the lower end face of the electromagnet assembly 35 is in contact with the end face of the iron core 34. The cover plate 38 is coaxially fitted over the intake joint 41, so that the lower end surface of the cover plate 38 is in contact with the upper end surface of the yoke 37. The iron core 34, the yoke 37 and the cover plate 38 are fixed by seam welding the upper and lower end faces of the yoke 37.

Fifthly, injection molding of the outer shell of the nozzle body 2 and the rotation preventing pin 36 is performed.

Sixthly, the seal ring is fitted into the intake joint 41. The rectangular ring is arranged in the groove of the nozzle body 2.

This application compares with current gas injection valve, because the seal structure of this application does not have nonmetal sealing device and flow area is great when opening entirely, stretches into combustion chamber part material heat resistance moreover higher, consequently can be directly spout gaseous medium into in the internal-combustion engine combustion chamber directly. Meanwhile, the spring 51 for closing the valve rod 1 is arranged at a position with larger middle space of the whole injector, the size of the injection end of the injector can be reduced, the internal flow area is larger, and the arrangement on an engine cylinder cover is easier to realize. In addition, because the guide position of the valve rod 1 is close to the sealing surface, the coaxiality of the valve rod 1 and the sealing conical surface is better, the sealing performance is better when the valve rod is in the closed position, and the opening degree in the circumferential direction is more uniform when the valve rod is opened, so that the mixing of gas in an engine is more facilitated.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The gas injection valve provided in the present application is described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims

1. A gas injection valve, comprising: the device comprises a valve rod (1), a nozzle body (2), an electromagnetic control assembly (3) and an air inlet assembly (4) which are connected in sequence;

a first through hole (20) penetrates through the nozzle body (2), and an assembly port (200) is arranged at one end of the first through hole (20); a second through hole (30) penetrates through the interior of the electromagnetic control assembly (3), and the second through hole (30) is coaxially communicated with the first through hole (20); the air inlet assembly (4) is communicated with the other end of the second through hole (30) so as to introduce fuel gas into the air inlet assembly;

two ends of the valve rod (1) are respectively provided with a sealing end (10) and a guiding end (100), and the guiding end (100) enters from the assembling port (200) and penetrates out of the second through hole (30); an elastic limiting mechanism (5) is arranged in the first through hole (20), the elastic limiting mechanism (5) is sleeved on the valve rod (1) to limit the sealing end (10) of the valve rod (1) to be attached and sealed with the assembling port (200);

the electromagnetic control assembly (3) can drive the valve rod (1) to compress the elastic limiting mechanism (5), so that the joint sealing is opened, and the gas is released.

2. Gas injection valve according to claim 1, characterized in that said electromagnetic control assembly (3) comprises: the magnetic control device comprises an armature (31), a limiting sleeve (32), an adjusting washer (33) and a magnetic conduction mechanism;

the limiting sleeve (32) is fixedly connected to the valve rod (1), and the bottom of the limiting sleeve is contacted with the elastic limiting mechanism (5); the armature (31) is sleeved on the valve rod (1), and the adjusting washer (33) is clamped between the armature (31) and the limiting sleeve (32);

the magnetic conduction mechanism is arranged on the outer sides of the limiting sleeve (32) and the armature (31) in a surrounding mode, so that electromagnetic force is applied to the armature (31), and the limiting sleeve (32) compresses the elastic limiting mechanism (5).

3. The gas injection valve of claim 2, wherein said magnetically permeable mechanism comprises: the iron core (34) and the part that the cover was established the stop collar (32) outside encircle electromagnet assembly (35) in the iron core (34) outside, iron core (34) are used for with the electromagnetic force conduction that electromagnet assembly (35) produced gives armature (31).

4. Gas injection valve according to claim 3, wherein said elastic limit mechanism (5) comprises: a spring (51) and a spring abutting plate (52) sleeved on the valve rod (1);

the bottom surface of the spring (51) abuts against the inner mounting groove of the first through hole (20), and the spring abutting plate (52) is used for pressing the top surface of the spring (51).

5. Gas injection valve according to claim 4, wherein the valve stem (1) is provided with a guiding section (11) near the sealing end (10), the guiding section (11) fitting the inner wall of the first through hole (20) to ensure that the valve stem (1) moves in a straight line.

6. Gas injection valve according to claim 5, characterized in that said electromagnetic control assembly (3) further comprises: and the anti-rotation pin (36), wherein the anti-rotation pin (36) is connected to the outer side of the electromagnet assembly (35) to prevent deflection.

7. Gas injection valve according to claim 6, wherein the air intake assembly (4) comprises: an air inlet joint (41) used for inputting fuel gas and a magnetic isolation sleeve (42) used for increasing electromagnetic force;

the magnetic isolation sleeve (42) is sleeved on the outer side of the iron core (34) and is in clearance fit with the armature (31); the upper end of the magnetism isolating sleeve (42) is fixedly connected with the lower end of the air inlet joint (41).

8. The gas injection valve according to claim 7, characterized in that the armature (31), the guide section (11) and the spring abutment plate (52) are each provided with a flow channel, which is provided along the length direction of the valve stem (1) to increase the flow space of the gas.

9. Gas injection valve according to claim 8, wherein said sealing end (10) is provided as a ball sealing end and said assembly port (200) is provided as a cone port, both cooperating to ensure a uniform injection of said gas in the circumferential direction.

10. Gas injection valve according to any of claims 1 to 9, wherein the nozzle body (2) and the gas inlet assembly (4) are externally provided with a sealing ring (6).