A side-inlet and bottom-outlet gas injector

Abstract

The utility model discloses a side-inlet and bottom-outlet type gas injector, which relates to the technical field of side-inlet and bottom-outlet type gas injectors. The side-inlet and bottom-outlet type gas injector comprises an electromagnetic device, a valve body and a nozzle. The electromagnetic device is mounted on the valve body, an air inlet cavity is provided on the valve body, and at least one air inlet connected to the air inlet cavity is provided on the outer peripheral wall of the valve body. The air inlet is used to connect high-pressure gas, the nozzle is mounted on the valve body, an air outlet that can be connected to the air inlet cavity is provided on the nozzle, and the electromagnetic device is provided with a sealing unit. The electromagnetic device controls the movement of the sealing unit to open or close the passage between the air inlet cavity and the air outlet. By setting the sealing unit, when the electromagnetic device is in the open state, the sealing unit opens the air outlet, so that the air inlet cavity is connected to the air outlet, and the gas flows out through the air outlet, thereby completing the gas injection. When the electromagnetic device is closed, the sealing unit is driven to completely seal the nozzle, and a sufficient sealing effect is generated under the action of the electromagnetic device and the pressure difference force of the gas.

Description

Technical Field

[0001] The utility model relates to the technical field of gas injectors, in particular to a side-inlet and bottom-outlet 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 requirements, so it is necessary to develop a new sealing form of gas injector. Utility Model Content

[0004] The utility model aims to provide a side-inlet and bottom-outlet 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] To achieve the above-mentioned purpose, the scheme adopted by the utility model is: a side-inlet and bottom-outlet type gas injector, comprising an electromagnetic device, a valve body and a nozzle, wherein the electromagnetic device is mounted on the valve body, an air inlet cavity is provided on the valve body, at least one air inlet connected to the air inlet cavity is provided on the outer peripheral wall of the valve body, the air inlet is used to connect high-pressure gas, the nozzle is mounted on the valve body, an air outlet that can be connected to the air inlet cavity is provided on the nozzle, and the electromagnetic device is provided with a sealing unit;

[0006] The electromagnetic device controls the sealing unit to move so as to open or close the passage between the air inlet cavity and the air outlet.

[0007] In this solution, a sealing unit is provided, and when the electromagnetic device is in the open state, the sealing unit opens the air outlet, so that the air inlet cavity is connected with the air outlet, and the gas flows out through the air outlet, thereby completing the gas injection. When the electromagnetic device is closed, the sealing unit is driven to completely seal the nozzle, and under the action of the electromagnetic device and the gas pressure difference force, a sufficient sealing effect is produced.

[0008] Preferably, the sealing unit includes an elastic element arranged at the lower end of the electromagnetic device, 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 pressure-guiding groove for introducing gas to reduce the gas pressure difference force and press the elastic element against the electromagnetic device.

[0009] 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.

[0010] Preferably, the nozzle comprises an upper part and a lower part which are integrally formed, and a diameter of the lower part is larger than a diameter of the upper part.

[0011] In this solution, the nozzle is set to be smaller at the top and larger at the bottom to further increase the potential energy of the gas when it is ejected.

[0012] As a further preference, the upper portion is provided with an orifice communicating with the air outlet, and the length of the orifice is less than half of the diameter of the orifice.

[0013] In this solution, the nozzle is built with an orifice with a diameter of d, and the length of the orifice should be less than 1 / 2d, forming a throttling orifice plate, thereby realizing the quantitative and dosing functions.

[0014] As a further preference, the cross section of the upper portion is arranged in a trapezoidal shape, and the diameter of the upper end of the upper portion is larger than the diameter of the lower end.

[0015] Preferably, a volume groove is provided on the valve body.

[0016] In this solution, by setting up a volume groove, the total amount of gas between the volume groove and the valve body and the gap cavity of the electromagnetic device can be balanced, avoiding the formation of dead volume, generating high pressure or negative pressure to block the movement of the electromagnetic device, thereby improving the dynamic responsiveness of the injector.

[0017] Preferably, the valve body is provided with an air pressure balance hollow groove and an air pressure balance flat position.

[0018] In this solution, by providing an air pressure balancing hollow groove and an air pressure balancing flat position, the air pressure between the cavities on the valve body can be quickly balanced during the opening and closing process of the injector, thereby reducing the pressure difference force.

[0019] As a further preference, the flange and the limiting boss are coated with a waterproof coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a side-inlet and bottom-outlet gas injector of the utility model;

[0021] Figure 2 It is a structural schematic diagram of a sealing unit of a side-inlet and bottom-outlet gas injector of the utility model;

[0022] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure at A.

[0023] In the figure: 1. electromagnetic coil assembly; 2. valve body; 3. moving iron core; 4. sealing unit; 5. nozzle; 6. pre-tightening screw; 7. spring; 8. spring seat; 9. air pressure balance hollow groove; 10. volume groove; 11. air pressure balance flat position; 12. air inlet; 13. air outlet; 14. elastic element; 15. flange; 16. limit boss; 17. pressure guide groove; 18. orifice. DETAILED DESCRIPTION

[0024] 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.

[0025] The utility model discloses a side-inlet and bottom-outlet type gas injector, which comprises an electromagnetic device, a valve body 2 and a nozzle 5, wherein the electromagnetic device is mounted on the valve body 2. An air inlet cavity is provided on the valve body 2, and at least one air inlet 12 connected to the air inlet cavity is provided on the outer peripheral wall of the valve body 2, wherein the air inlet 12 is used to connect high-pressure gas. The nozzle 5 is mounted on the valve body 2, and an air outlet 13 that can be connected to the air inlet cavity is provided on the nozzle 5, and a sealing unit 4 is provided on the electromagnetic device.

[0026] The electromagnetic device controls the movement of the sealing unit 4 to open or close the passage between the air inlet cavity and the air outlet 13 .

[0027] Specifically, in this embodiment, an elastic mounting groove is provided on the valve body 2, and a movable groove is provided on the lower side of the elastic mounting groove and is connected thereto. An air inlet cavity is provided on the valve body 2 and is located on the lower side of the elastic mounting groove. An air inlet 12 connected to the air inlet cavity is provided on the outer peripheral wall of the valve body 2, and a plurality of air inlets 12 are provided. A nozzle 5 is provided on the lower end of the air inlet cavity on the valve body 2. The electromagnetic device is provided with a sealing unit 4, and an air outlet 13 that can be connected to the air inlet cavity is provided on the nozzle 5. An opening is provided at the upper end of the valve body 2, and the electromagnetic device seals the opening. The injector takes in air through a plurality of air inlets 12 on the valve body 2, and a mesh fine filter is installed on the valve body 2 portion of the air inlet 12, and the gas enters the air inlet cavity at the lower part of the valve body 2. The electromagnetic device controls the movement of the sealing unit 4 to open or close the passage between the air inlet cavity and the air outlet 13.

[0028] Further, as a preferred embodiment, the sealing unit 4 includes an elastic element 14 disposed at the lower end of the electromagnetic device, 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 pressure-guiding groove 17 for introducing gas to reduce the gas pressure difference force and pressing the elastic element 14 against the electromagnetic device. The flange 15 and the limiting boss 16 are coated with a waterproof coating using plasma coating technology.

[0029] Specifically, in this embodiment, the electromagnetic device includes an electromagnetic coil assembly 1, a moving iron core 3 and a spring assembly. The spring assembly is arranged in the elastic mounting groove, and the moving iron core 3 is arranged on the lower side of the spring assembly and can be movably arranged in the movable groove. The valve body 2 is provided with a movable groove, and the moving iron core 3 device can be movably arranged in the movable groove. An air inlet cavity is provided on the lower side of the movable groove, and a sealing unit 4 that can seal the air outlet 13 is arranged between the moving iron core 3 device and the nozzle 5.

[0030] The spring assembly includes a pre-tightening screw 6, a spring 7 and a spring seat 8. The opening is provided with a pre-tightening screw 6 to seal the opening, the bottom of the elastic mounting groove is provided with a spring seat 8, 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. Among them, the electromagnetic coil assembly 1 is composed of a coil skeleton, an enameled wire winding, an insulating encapsulation layer, a magnetic protection element, an electrical connector, etc.; the spring 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 gas injector is achieved by energizing or de-energizing the electromagnet, and the throttling orifice 18 on the nozzle 5 is used to achieve precise quantitative gas injection. The gas injector is a side-feeding type. When the electromagnetic coil assembly 1 of the gas injector is powered off, the moving iron core 3 is tightly attached to 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 1 of the 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 valve coil assembly is in an open state. The gas in the gas inlet cavity of the gas injector passes through the gas channel formed by the matching end 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.

[0031] Specifically, in this embodiment, by setting the sealing unit 4, when the electromagnetic coil assembly 1 is in the open state, the moving iron core 3 device 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 1 is closed, the sealing unit 4 at the lower end of the moving iron core 3 device completely seals the nozzle 5, and under the action of the moving iron core 3 device and the gas pressure difference force, a sufficient sealing effect is produced. By setting the spring 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 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.

[0032] Further, as a preferred embodiment, the nozzle 5 includes an upper part and a lower part formed in one piece, the diameter of the lower part is larger than the diameter of the upper part. The upper part is provided with an orifice 18 connected to the air outlet 13, and the length of the orifice 18 is less than half of the diameter of the orifice 18. The cross section of the upper part is arranged in a trapezoidal shape, and the upper end diameter of the upper part is larger than the diameter of the lower end.

[0033] 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.

[0034] Specifically, in this embodiment, the nozzle 5 is provided with a flange 15, a limiting boss 16 for limiting the depth of the flange 155 pressed into the elastic element 14, and a pressure-guiding groove 17 for minimizing the gas pressure difference force. When the electromagnetic coil assembly 1 of the 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.

[0035] Specifically, in this embodiment, the nozzle 5 is set to be small at the top and large at the bottom to further increase the potential energy of the gas when it is ejected. The nozzle 5 is built with an orifice 18 with a diameter d, and the length of the orifice 18 should be less than 1 / 2d to form a throttling orifice plate, thereby realizing quantitative and dosing functions.

[0036] Furthermore, as a preferred embodiment, a volume groove 10 is provided on the valve body 2 .

[0037] Furthermore, as a preferred embodiment, the valve body 2 is provided with an air pressure balance hollow groove 9 and an air pressure balance flat position 11 .

[0038] Specifically, in the present embodiment, the design of the pressure-conducting groove 17 has two functions: one is to guide the gas in the air inlet cavity of the gas injector into the bottom of the moving iron core 3 so as 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 into the elastic element 14 carrier of the moving iron core 3 so as to resist the adhesion force generated between the elastic element 14 and the flange 15 in the sealed state.

[0039] Specifically, in this embodiment, no matter the electromagnetic coil assembly 1 is in the open or closed state, in order to reduce the gas pressure difference force acting on the moving iron core 3 as much as possible, a gas pressure balancing flat position 11 and a hollow groove are provided on the moving iron core 3, so that the gas pressure in the gas elastic mounting groove, the movable groove and the air inlet cavity can be balanced as soon as possible until they are equal.

[0040] 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 cutoff orifice 18 diameter d, 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 gas injector. In order to ensure that no throttling occurs at other positions on the gas channel, 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 of the gas injector is in an open 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 diameter D of the flange 15 and the lift L of the moving iron core 3 and the diameter d of the orifice 18 constitute an equivalent Venturi tube, thereby realizing the metering function. The side-inlet and bottom-out gas injector is equipped with an electromagnetic coil assembly 1, 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 gas injector. This side-inlet and bottom-out 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.

[0041] Specifically, in this embodiment, by setting the volume groove 10, when the electromagnetic coil assembly 1 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 the air pressure balance hollow groove 9 and the air pressure balance flat position 11. During the opening and closing process of the injector, the air pressure between the groove, the active groove and the air inlet cavity can be quickly and elastically installed, thereby reducing the pressure difference force. By setting the 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 is formed, thereby realizing the 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 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.

[0042] 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 side-inlet and bottom-outlet gas injector, characterized in that: The invention comprises an electromagnetic device, a valve body and a nozzle, wherein the electromagnetic device is mounted on the valve body, an air inlet cavity is formed on the valve body, at least one air inlet connected to the air inlet cavity is formed on the outer peripheral wall of the valve body, and the air inlet is used to connect high-pressure gas, the nozzle is mounted on the valve body, an air outlet that can be connected to the air inlet cavity is provided on the nozzle, and the electromagnetic device is provided with a sealing unit; The electromagnetic device controls the sealing unit to move so as to open or close the passage between the air inlet cavity and the air outlet.

2. A side-inlet and bottom-outlet gas injector according to claim 1, characterized in that: The sealing unit includes an elastic element arranged at the lower end of the electromagnetic device, 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 pressure-conducting groove for introducing gas to reduce the gas pressure difference force and press the elastic element against the electromagnetic device.

3. A side-inlet and bottom-outlet gas injector according to claim 1, characterized in that: The nozzle comprises an upper part and a lower part which are integrally formed, and a diameter of the lower part is larger than a diameter of the upper part.

4. A side-inlet and bottom-outlet gas injector according to claim 3, characterized in that: The upper portion is provided with an orifice communicating with the air outlet, and the length of the orifice is less than half of the diameter of the orifice.

5. A side-inlet and bottom-outlet gas injector according to claim 4, characterized in that: The cross section of the upper part is arranged in a trapezoidal shape, and the diameter of the upper end of the upper part is larger than the diameter of the lower end.

6. A side-inlet and bottom-outlet gas injector according to claim 1, characterized in that: The valve body is provided with a volume groove.

7. A side-inlet and bottom-outlet gas injector according to claim 1, characterized in that: The valve body is provided with an air pressure balance hollow groove and an air pressure balance flat position.

8. A side-inlet and bottom-outlet gas injector according to claim 2, characterized in that: The flange and the limiting boss are coated with a waterproof coating.

Images