Upper-inlet and lower-outlet type gas ejector

Abstract

The utility model discloses an upper-inlet lower-outlet type gas ejector, which relates to the technical field of gas ejectors, and comprises an electromagnetic coil component, a valve body, a movable iron core device and a nozzle, and the electromagnetic coil component is sleeved outside the valve body. A movable groove is formed in the valve body, the movable iron core device is movably arranged in the movable groove, an air inlet cavity is formed in the lower side of the movable groove, and an air inlet through hole communicated with the outside and the air inlet cavity is formed in the movable iron core device. A nozzle is arranged on the valve body and located at the lower end of the air inlet cavity, an air outlet is formed in the nozzle, and a sealing unit is arranged between the movable iron core device and the nozzle. By arranging the sealing unit, when the electromagnetic coil assembly is powered on, the movable iron core device moves upwards to open the gas outlet, the gas inlet cavity communicates with the gas outlet, gas flows out through the gas outlet, and therefore gas injection is completed. When the electromagnetic coil assembly is closed, the sealing unit at the lower end of the movable iron core device completely seals the nozzle, and a sufficient sealing effect is generated under the action of the movable iron core device and gas pressure difference force.

Description

Technical Field

[0001] The utility model relates to the technical field of gas injectors, in particular to a top-in and bottom-out type gas injector. Background Art

[0002] Under the guidance of the "dual carbon" policy, clean energy with lower carbon emission coefficients than gasoline and diesel, such as natural gas, hydrogen, methanol, and ammonia, is more widely used in internal combustion engine combustion, which is an important technical approach to achieving "carbon peak".

[0003] Therefore, it is necessary to develop an injector that is different from liquid media such as gasoline and diesel. Since natural gas, hydrogen, methanol and ammonia are gaseous combustion media with lower viscosity than gasoline and diesel, the original metal cone / plane sealing performance cannot meet the required technical problems, so it is necessary to develop a new sealing form of top-in and bottom-out gas injector. Utility Model Content

[0004] The utility model aims to provide a top-in and bottom-out gas injector, which solves the problem that the original metal cone / plane sealing performance cannot meet the requirements because the combustion media such as natural gas, hydrogen methanol and ammonia are gaseous and have lower viscosity than gasoline and diesel.

[0005] In order to achieve the above-mentioned purpose, the scheme adopted by the utility model is: a top-in and bottom-out type gas injector, comprising an electromagnetic coil assembly, a valve body, a moving iron core device and a nozzle, the electromagnetic valve coil assembly is sleeved outside the valve body, a movable groove is provided on the valve body, the moving iron core device can be movably arranged in the movable groove, an air inlet cavity is provided on the lower side of the movable groove, an air inlet through hole connecting the outside with the air inlet cavity is provided on the moving iron core device, the nozzle is provided on the valve body at the lower end of the air inlet cavity, the nozzle is provided with an air outlet that can be connected with the air inlet cavity, and a sealing unit that can seal the air outlet is provided between the moving iron core device and the nozzle;

[0006] When the electromagnetic coil assembly is energized, the moving iron core device moves upward, so that the sealing unit opens the air outlet, so that the air inlet cavity is connected to the air outlet, and the gas enters the air inlet cavity through the air inlet hole and then flows out through the air outlet, thereby completing the gas injection.

[0007] In this solution, a sealing unit is provided. When the electromagnetic coil assembly is energized, the moving iron core device moves upward so that the sealing unit opens the air outlet, so that the air inlet cavity is connected to the air outlet and flows out through the air outlet, thereby completing the gas injection. When the electromagnetic coil assembly is closed, the sealing unit at the lower end of the moving iron core device completely seals the nozzle, and under the action of the moving iron core device and the gas pressure difference force, a sufficient sealing effect is produced.

[0008] Preferably, the moving iron core device includes a moving iron core and a spring assembly, an elastic mounting groove is provided on the valve body, the spring assembly is arranged in the elastic mounting groove, the movable groove is provided on the lower side of the elastic mounting groove and is connected with the movable groove, and the moving iron core is provided on the lower side of the spring assembly and can be movably arranged in the movable groove.

[0009] In this solution, a spring assembly can be provided to drive the moving iron core to move in the movable groove, thereby driving the sealing unit to open or close the nozzle. The sealing unit can also be attached to the nozzle for sealing under the action of the preload force of the spring assembly and the gas pressure difference force.

[0010] As a further preference, the sealing unit includes an elastic element arranged at the lower end of the moving iron core, the upper end surface of the nozzle extends outward to form a flange, the lower end of the elastic element is provided with a limiting boss for limiting the depth of the flange pressed into the elastic element, and the nozzle is provided with a guide groove, the guide groove is used to introduce gas to reduce the gas pressure difference force, and press the elastic element against the moving iron core.

[0011] In this solution, the gas pressure difference force is minimized, the gas sealing performance is reliable, the elastic element has a long durability, and the elastic element and the elastic element carrier are bonded without loosening.

[0012] As a further preference, the spring assembly includes a pre-tightening screw, a spring and a spring seat, the upper end of the valve body is provided with an opening, the opening is provided with a pre-tightening screw and seals the opening, the air inlet hole is opened on the pre-tightening screw and is connected to the elastic mounting groove, the spring seat is provided at the bottom of the elastic mounting groove, and the spring connected to the spring seat and the pre-tightening screw is provided between the two.

[0013] As a further preference, a volume groove is provided on the valve body, and the volume groove is communicated with the movable groove.

[0014] In this solution, by setting a volume groove, when the electromagnetic coil assembly is opened or closed, the moving iron core moves upward or downward, which can ensure the total amount of gas between the volume groove and the gap cavity between the moving iron core and the movable groove is balanced, avoiding the formation of dead volume in the movable groove, generating high pressure or negative pressure to block the movement of the moving iron core, thereby improving the dynamic responsiveness of the injector.

[0015] As a further preference, the moving iron core adopts a hollow blind hole coaxial structure, and the lower part of the moving iron core is symmetrically provided with cross holes in a direction perpendicular to the axis centerline.

[0016] In this solution, a cross hole is provided so that the gas is introduced into the air inlet cavity through the moving iron core.

[0017] As a further preference, the nozzle adopts a rotating body structure, and an orifice is arranged in the nozzle.

[0018] In this solution, a throttling orifice plate is formed by setting an orifice on the nozzle with a diameter of d and a length of less than 1 / 2d, thereby realizing the quantitative function.

[0019] Preferably, the electromagnetic coil assembly adopts pulse width modulation control in constant current mode.

[0020] In this scheme, the boost current, hold current and spring preload are adjusted to adjust the opening time and closing time, thereby improving the linearity and linear range of the top-in and bottom-out gas injector.

[0021] As a further preference, the elastic element is formed by a metal vulcanization process.

[0022] In this solution, the elastic element is fastened in the elastic element carrier at the lower end of the moving iron core by gluing.

[0023] As a further preference, the flange and the limiting boss are coated with a waterproof coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a top-in and bottom-out type gas injector of the utility model;

[0025] Figure 2 It is a structural schematic diagram of a sealing unit of a top-in and bottom-out type gas injector of the utility model;

[0026] Figure 3 It is a structural schematic diagram of the power-on state of the sealing unit of the top-in and bottom-out type gas injector of the utility model.

[0027] In the figure: 1. electromagnetic coil assembly; 2. valve body; 3. moving iron core device; 4. sealing unit; 5. nozzle; 6. pre-tightening screw; 7. spring; 8. spring seat; 10. volume groove; 12. air inlet hole; 13. air outlet; 14. elastic element; 15. flange; 16. limit boss; 17. pressure guide groove; 18. orifice. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present invention, and thus to more clearly define the scope of protection claimed by the present invention, the present invention is described in detail below with respect to certain specific embodiments of the present invention. It should be noted that the following are only certain specific implementation methods of the present invention, which are only part of the embodiments of the present invention, wherein the specific and direct description of the relevant structures is only for the convenience of understanding the present invention, and each specific feature does not naturally and directly limit the scope of implementation of the present invention. The conventional selections and substitutions made by those skilled in the art under the guidance of the present invention shall be deemed to be within the scope of protection claimed by the present invention.

[0029] like Figure 1-Figure 3 As shown, a top-in and bottom-out type gas injector disclosed in the utility model comprises an electromagnetic coil assembly 1, a valve body 2, a moving iron core device 3 and a nozzle 5, wherein the electromagnetic valve coil assembly 1 is sleeved outside the valve body 2. A movable groove a is provided on the valve body 2, and the moving iron core device 3 is movably arranged in the movable groove a. An air inlet cavity c is provided on the lower side of the movable groove, and an air inlet through hole 12 connecting the outside with the air inlet cavity is provided on the moving iron core device 3. A nozzle 5 is provided at the lower end of the air inlet cavity c on the valve body 2, and an air outlet 13 which can be connected with the air inlet cavity is provided on the nozzle 5, and a sealing unit 4 which can seal the air outlet 13 is provided between the moving iron core device 3 and the nozzle 5. Preferably, a balance cavity b is provided between the movable groove a and the air inlet cavity c, and the balance cavity b maintains air pressure balance when the moving iron core device 3 moves.

[0030] When the electromagnetic coil assembly is energized, the moving iron core device 3 moves upward, so that the sealing unit 4 opens the air outlet 13, so that the air inlet cavity is connected with the air outlet 13, and the gas enters the air inlet cavity through the air inlet hole 12 and then flows out through the air outlet 13, thereby completing the gas injection.

[0031] Further, as a preferred embodiment, the moving iron core device 3 includes a moving iron core 3 and a spring 7 assembly, an elastic mounting groove is provided on the valve body 2, and the spring 7 assembly is arranged in the elastic mounting groove. A movable groove is provided on the lower side of the elastic mounting groove and is connected thereto, and the moving iron core 3 is provided on the lower side of the spring 7 assembly and is movably arranged in the movable groove.

[0032] Further, as a preferred embodiment, the spring 7 assembly includes a pre-tightening screw 6, a spring 7 and a spring seat 8, and an opening is provided at the upper end of the valve body 2, and a pre-tightening screw 6 is provided at the opening to seal the opening. An air intake hole 12 is provided on the pre-tightening screw 6 and communicates with the elastic mounting groove, a spring seat 8 is provided at the bottom of the elastic mounting groove, and a spring 7 connected to the spring seat 8 and the pre-tightening screw 6 is provided between the spring seat 8 and the pre-tightening screw 6.

[0033] Further, as a preferred embodiment, the sealing unit 4 includes an elastic element 14 disposed at the lower end of the moving iron core 3, the upper end surface of the nozzle 5 extends outward to form a flange 15, and the lower end of the elastic element 14 is provided with a limiting boss 16 for limiting the depth of the flange 15 pressed into the elastic element 14. The nozzle 5 is provided with a guide groove 17, which is used to introduce gas to reduce the gas pressure difference force and press the elastic element 14 against the moving iron core 3. The flange 15 and the limiting boss 16 are coated with a waterproof coating using plasma coating technology.

[0034] Specifically, in this embodiment, it includes an electromagnetic coil assembly 1, a valve body 2, a moving iron core 3, a nozzle 5 and a spring 7 assembly. Among them, the electromagnetic coil assembly is composed of a coil skeleton, an enameled wire winding, an insulating encapsulation layer, a magnetic protection element, an electrical connector, etc. The spring 7 assembly is composed of a pre-tightening screw 6, a spring 7, a spring seat 8, etc. In particular, the mating ends of the moving iron core 3 and the nozzle 5 constitute a sealing unit 4, thereby achieving a higher gas sealing performance. The opening or closing of the top-in and bottom-out type gas injector is achieved by energizing or de-energizing the electromagnet, and the throttling orifice 18 on the nozzle 5 is used to achieve accurate quantitative gas injection. The top-in and bottom-out type gas injector is a top-in and bottom-out (Side feeding) type. The injector takes in air through the air intake hole 12 on the pre-tightening screw 6, and a cylindrical fine filter is installed on the air intake hole 12. The gas enters the inner cavity of the moving iron core 3 through the spring 7 cavity and the spring seat 8, and enters the air intake cavity at the lower part of the valve body 2 through the radial opening of the moving iron core 3. When the electromagnetic coil assembly of the top-in-bottom-out gas injector is powered off, the moving iron core 3 is tightly pressed against the nozzle 5 under the combined action of the preload force of the spring 7 and the pressure difference force, and the elastic element 14 at the lower end of the moving iron core 3 and the flange 15 at the upper end of the nozzle 5 and the limiting boss 16 form an effective sealing unit 4, thereby achieving a high gas sealing performance. When the electromagnetic coil assembly of the top-in-bottom-out gas injector is powered on, the moving iron core 3 moves upward to a position in contact with the valve body 2 under the action of the electromagnetic lifting force, and the electromagnetic coil assembly is in a powered state. The gas in the air inlet cavity of the top-in-bottom-out gas injector passes through the gas channel formed by the matching ends of the moving iron core 3 and the nozzle 5, and flows out through the gas outlet 13 of the nozzle 5, thereby completing the gas injection.

[0035] Specifically, in this embodiment, by setting the sealing unit 4, when the electromagnetic coil assembly is powered on, the moving iron core device 3 moves upward, so that the sealing unit 4 opens the air outlet 13, so that the air inlet cavity is connected with the air outlet 13 and flows out through the air outlet 13, thereby completing the gas injection. When the electromagnetic coil assembly is closed, the sealing unit 4 at the lower end of the moving iron core device 3 completely seals the nozzle 5, and under the action of the moving iron core device 3 and the gas pressure difference force, a sufficient sealing effect is produced. By setting the spring 7 assembly, the moving iron core 3 can be driven to move in the movable groove, thereby driving the sealing unit 4 to open or close the nozzle 5, and the sealing unit 4 can also be attached to the nozzle 5 for sealing under the action of the preload force of the spring 7 assembly and the gas pressure difference force. The gas pressure difference force is minimized, the gas sealing performance is reliable, the elastic element 14 has a high durability, and the elastic element 14 is bonded to the elastic element 14 carrier without loosening.

[0036] Further, as a preferred embodiment, a volume groove 10 is provided on the valve body 2, and the volume groove 10 is communicated with the movable groove.

[0037] Furthermore, as a preferred embodiment, the moving iron core 3 adopts a hollow blind hole coaxial structure, and the lower part of the moving iron core 3 is symmetrically provided with cross holes in a direction perpendicular to the axis.

[0038] Further, as a preferred embodiment, the nozzle 5 adopts a rotating body structure, and an orifice 18 is provided in the nozzle 5. The nozzle 5 adopts a rotating body structure, and an orifice 18 is provided in the nozzle 5.

[0039] Furthermore, as a preferred embodiment, the electromagnetic coil assembly adopts pulse width modulation control in a constant current mode.

[0040] Furthermore, as a preferred embodiment, the elastic element 14 is formed by a metal vulcanization process.

[0041] Specifically, in this embodiment, the closing unit is composed of a moving iron core 3 and a nozzle 5. Preferably, the elastic element 14 is directly formed in the elastic element 14 carrier at the lower end of the moving iron core 3 by a metal vulcanization process. In order to increase the adhesion and pull-off force, the bottom of the elastic element 14 carrier is roughened and glued before the vulcanization process, and the side wall is serrated. Of course, the elastic element 14 can also be pre-pressed and then glued in the elastic element 14 carrier by glue, provided that the glue can provide sufficient and long-term bonding force.

[0042] Specifically, in this embodiment, the nozzle 5 is provided with a flange 15, a limiting boss 16 for limiting the depth of the flange 15 pressed into the elastic element 14, and a pressure-guiding groove 18 for minimizing the gas pressure difference force. When the electromagnetic coil assembly of the top-in-bottom-out type gas injector is powered off, the moving iron core 3 moves downward under the combined action of the preload force of the spring 7 and the gas pressure difference force, and its elastic element 14 is tightly pressed on the flange 15 and the limiting boss 16 of the nozzle 5, thereby achieving reliable gas sealing performance. Preferably, the limiting boss 16 limits the depth of the flange 15 pressed into the elastic element 14, thereby maximizing the durability of the elastic element 14 while ensuring the sealing function.

[0043] Specifically, in this embodiment, the design of the pressure-conducting groove 18 has two functions: one is to guide the gas in the air inlet cavity of the top-in and bottom-out type gas injector into the bottom of the moving iron core 3 to minimize the gas pressure difference force acting on the moving iron core 3. The other is to use the gas introduced into the bottom of the moving iron core 3 to press the elastic element 14 tightly into the elastic element 14 carrier of the moving iron core 3 to resist the adhesion force generated between the elastic element 14 and the flange 15 in the sealed state.

[0044] Specifically, in this embodiment, when the electromagnet is energized, the moving iron core 3 moves upward under the combined action of the electromagnetic lifting force and the gas pressure difference force until it fits the stop position of the valve body 2, thereby forming a gas flow cross section with a flange 15 diameter D and a stroke L. After passing through this cross section, the gas flows into the nozzle 5 with a diameter d of the cut-off orifice 18, and finally flows out from the gas outlet 13. These two gas flow cross sections form an equivalent Venturi tube, thereby realizing the quantitative injection function. The orifice 18 on the nozzle 5 is a throttle port, which plays a key role in the quantitative and metering functions of the top-in and bottom-out type gas injector. In order to ensure that other positions on the gas channel do not generate throttling, it is necessary to equip the flange 15 with a suitable diameter and lift to ensure that the equivalent diameter of its cross-sectional area is greater than the diameter of the orifice 18 of the nozzle 5. When the solenoid valve coil assembly 1 of the top-in and bottom-out type gas injector is in an energized state, the entire gas channel is equivalent to a reducer. A gas channel is generated between the moving iron core 3 and the nozzle 5. The gas channel formed by the flange diameter D and the lift L of the moving iron core 3 and the orifice 18 diameter d constitute an equivalent Venturi tube, thereby realizing the metering function. The top-in-bottom-out type gas injector is equipped with an electromagnetic coil assembly, and the electromagnetic coil is driven by pulse width modulation (PWM) in a constant current mode. The opening time (Ton) and the closing time (Toff) are adjusted by adjusting the boost / pull-in current and the hold current and the preload of the spring 7, thereby improving the linearity and linear range of the top-in-bottom-out type gas injector. The top-in-bottom-out type gas injector adopts an orifice flow design to avoid the use of a lift flow design, thereby avoiding the flow drift phenomenon caused by lift changes due to durable wear.

[0045] Specifically, in this embodiment, by setting the volume groove 10, when the electromagnetic coil assembly is opened or closed, the moving iron core 3 moves upward or downward, which can ensure the total amount of gas in the gap cavity between the volume groove 10 and the moving iron core 3 and the active groove. Balance, avoid the formation of dead volume in the active groove, generate high pressure or negative pressure to block the movement of the moving iron core 3, thereby improving the dynamic responsiveness of the injector. By setting a cross hole, the gas is introduced into the air inlet cavity through the moving iron core 3. By setting an orifice 18 on the nozzle 5, the diameter is d, and the length of the orifice 18 should be less than 1 / 2d, a throttling orifice plate is formed, thereby realizing a quantitative function. By adjusting the boost current and the hold current and the preload of the spring 7 to adjust the opening time (Ton) and the closing time (Toff), the linearity and linear range of the top-in and bottom-out type gas injector are improved. The elastic element 14 is fastened to the elastic element 14 carrier at the lower end of the moving iron core 3 by gluing.

[0046] The above are only preferred implementations of the present invention. It should be pointed out that for ordinary technicians in this technical field, multiple improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A top-in, bottom-out type gas injector, characterized in that: The invention comprises an electromagnetic coil assembly, a valve body, a moving iron core device and a nozzle, wherein the electromagnetic coil assembly is sleeved outside the valve body, a movable groove is provided on the valve body, the moving iron core device is movably arranged in the movable groove, an air inlet cavity is provided at the lower side of the movable groove, an air inlet through hole connecting the outside with the air inlet cavity is provided on the moving iron core device, the nozzle is provided at the lower end of the air inlet cavity on the valve body, an air outlet which can be connected with the air inlet cavity is provided on the nozzle, and a sealing unit which can seal the air outlet is provided between the moving iron core device and the nozzle; When the electromagnetic coil assembly is energized, the moving iron core device moves upward, so that the sealing unit opens the air outlet, so that the air inlet cavity is connected to the air outlet, and the gas enters the air inlet cavity through the air inlet hole and then flows out through the air outlet, thereby completing the gas injection.

2. A top-in, bottom-out type gas injector according to claim 1, characterized in that: The moving iron core device includes a moving iron core and a spring assembly. An elastic mounting groove is provided on the valve body. The spring assembly is arranged in the elastic mounting groove. The movable groove is provided at the lower side of the elastic mounting groove and is connected thereto. The moving iron core is arranged at the lower side of the spring assembly and can be movably arranged in the movable groove.

3. A top-in, bottom-out type gas injector according to claim 2, characterized in that: The sealing unit includes an elastic element arranged at the lower end of the moving iron core, the upper end surface of the nozzle extends outward to form a flange, the lower end of the elastic element is provided with a limiting boss for limiting the depth of the flange pressed into the elastic element, and the nozzle is provided with a guide groove, which is used to introduce gas to reduce the gas pressure difference force and press the elastic element against the moving iron core.

4. A top-in, bottom-out type gas injector according to claim 2, characterized in that: The spring assembly includes a pre-tightening screw, a spring and a spring seat. The upper end of the valve body is provided with an opening, and a pre-tightening screw is provided at the opening to seal the opening. The air inlet hole is opened on the pre-tightening screw and is connected to the elastic mounting groove. The spring seat is provided at the bottom of the elastic mounting groove, and the spring connected to the spring seat and the pre-tightening screw is provided between the two.

5. A top-in, bottom-out type gas injector according to claim 4, characterized in that: The valve body is provided with a volume groove, and the volume groove is communicated with the movable groove.

6. The top-in, bottom-out type gas injector according to claim 3, characterized in that: The moving iron core adopts a hollow blind hole coaxial structure, and the lower part of the moving iron core is symmetrically provided with cross holes in a direction perpendicular to the axis centerline.

7. The top-in, bottom-out type gas injector according to claim 1, characterized in that: The nozzle adopts a rotating body structure, and an orifice is arranged in the nozzle.

8. The top-in, bottom-out type gas injector according to claim 1, characterized in that: The electromagnetic coil assembly adopts pulse width modulation control in a constant current mode.

9. The top-in, bottom-out type gas injector according to claim 3, characterized in that: The elastic element is formed by a metal vulcanization process.

10. The top-in, bottom-out type gas injector according to claim 3, characterized in that: The flange and the limiting boss are coated with a waterproof coating.

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